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Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 | 2 | /* |
722c9a0c | 3 | * NET3 Protocol independent device support routines. |
1da177e4 | 4 | * |
1da177e4 | 5 | * Derived from the non IP parts of dev.c 1.0.19 |
722c9a0c | 6 | * Authors: Ross Biro |
1da177e4 LT |
7 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
8 | * Mark Evans, <evansmp@uhura.aston.ac.uk> | |
9 | * | |
10 | * Additional Authors: | |
11 | * Florian la Roche <rzsfl@rz.uni-sb.de> | |
12 | * Alan Cox <gw4pts@gw4pts.ampr.org> | |
13 | * David Hinds <dahinds@users.sourceforge.net> | |
14 | * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> | |
15 | * Adam Sulmicki <adam@cfar.umd.edu> | |
16 | * Pekka Riikonen <priikone@poesidon.pspt.fi> | |
17 | * | |
18 | * Changes: | |
19 | * D.J. Barrow : Fixed bug where dev->refcnt gets set | |
722c9a0c | 20 | * to 2 if register_netdev gets called |
21 | * before net_dev_init & also removed a | |
22 | * few lines of code in the process. | |
1da177e4 LT |
23 | * Alan Cox : device private ioctl copies fields back. |
24 | * Alan Cox : Transmit queue code does relevant | |
25 | * stunts to keep the queue safe. | |
26 | * Alan Cox : Fixed double lock. | |
27 | * Alan Cox : Fixed promisc NULL pointer trap | |
28 | * ???????? : Support the full private ioctl range | |
29 | * Alan Cox : Moved ioctl permission check into | |
30 | * drivers | |
31 | * Tim Kordas : SIOCADDMULTI/SIOCDELMULTI | |
32 | * Alan Cox : 100 backlog just doesn't cut it when | |
33 | * you start doing multicast video 8) | |
34 | * Alan Cox : Rewrote net_bh and list manager. | |
722c9a0c | 35 | * Alan Cox : Fix ETH_P_ALL echoback lengths. |
1da177e4 LT |
36 | * Alan Cox : Took out transmit every packet pass |
37 | * Saved a few bytes in the ioctl handler | |
38 | * Alan Cox : Network driver sets packet type before | |
39 | * calling netif_rx. Saves a function | |
40 | * call a packet. | |
41 | * Alan Cox : Hashed net_bh() | |
42 | * Richard Kooijman: Timestamp fixes. | |
43 | * Alan Cox : Wrong field in SIOCGIFDSTADDR | |
44 | * Alan Cox : Device lock protection. | |
722c9a0c | 45 | * Alan Cox : Fixed nasty side effect of device close |
1da177e4 LT |
46 | * changes. |
47 | * Rudi Cilibrasi : Pass the right thing to | |
48 | * set_mac_address() | |
49 | * Dave Miller : 32bit quantity for the device lock to | |
50 | * make it work out on a Sparc. | |
51 | * Bjorn Ekwall : Added KERNELD hack. | |
52 | * Alan Cox : Cleaned up the backlog initialise. | |
53 | * Craig Metz : SIOCGIFCONF fix if space for under | |
54 | * 1 device. | |
55 | * Thomas Bogendoerfer : Return ENODEV for dev_open, if there | |
56 | * is no device open function. | |
57 | * Andi Kleen : Fix error reporting for SIOCGIFCONF | |
58 | * Michael Chastain : Fix signed/unsigned for SIOCGIFCONF | |
59 | * Cyrus Durgin : Cleaned for KMOD | |
60 | * Adam Sulmicki : Bug Fix : Network Device Unload | |
61 | * A network device unload needs to purge | |
62 | * the backlog queue. | |
63 | * Paul Rusty Russell : SIOCSIFNAME | |
64 | * Pekka Riikonen : Netdev boot-time settings code | |
65 | * Andrew Morton : Make unregister_netdevice wait | |
722c9a0c | 66 | * indefinitely on dev->refcnt |
67 | * J Hadi Salim : - Backlog queue sampling | |
1da177e4 LT |
68 | * - netif_rx() feedback |
69 | */ | |
70 | ||
7c0f6ba6 | 71 | #include <linux/uaccess.h> |
1da177e4 | 72 | #include <linux/bitops.h> |
4fc268d2 | 73 | #include <linux/capability.h> |
1da177e4 LT |
74 | #include <linux/cpu.h> |
75 | #include <linux/types.h> | |
76 | #include <linux/kernel.h> | |
08e9897d | 77 | #include <linux/hash.h> |
5a0e3ad6 | 78 | #include <linux/slab.h> |
1da177e4 | 79 | #include <linux/sched.h> |
f1083048 | 80 | #include <linux/sched/mm.h> |
4a3e2f71 | 81 | #include <linux/mutex.h> |
11d6011c | 82 | #include <linux/rwsem.h> |
1da177e4 LT |
83 | #include <linux/string.h> |
84 | #include <linux/mm.h> | |
85 | #include <linux/socket.h> | |
86 | #include <linux/sockios.h> | |
87 | #include <linux/errno.h> | |
88 | #include <linux/interrupt.h> | |
89 | #include <linux/if_ether.h> | |
90 | #include <linux/netdevice.h> | |
91 | #include <linux/etherdevice.h> | |
0187bdfb | 92 | #include <linux/ethtool.h> |
1da177e4 | 93 | #include <linux/skbuff.h> |
a7862b45 | 94 | #include <linux/bpf.h> |
b5cdae32 | 95 | #include <linux/bpf_trace.h> |
457c4cbc | 96 | #include <net/net_namespace.h> |
1da177e4 | 97 | #include <net/sock.h> |
02d62e86 | 98 | #include <net/busy_poll.h> |
1da177e4 | 99 | #include <linux/rtnetlink.h> |
1da177e4 | 100 | #include <linux/stat.h> |
b14a9fc4 | 101 | #include <net/dsa.h> |
1da177e4 | 102 | #include <net/dst.h> |
fc4099f1 | 103 | #include <net/dst_metadata.h> |
1da177e4 | 104 | #include <net/pkt_sched.h> |
87d83093 | 105 | #include <net/pkt_cls.h> |
1da177e4 | 106 | #include <net/checksum.h> |
44540960 | 107 | #include <net/xfrm.h> |
1da177e4 LT |
108 | #include <linux/highmem.h> |
109 | #include <linux/init.h> | |
1da177e4 | 110 | #include <linux/module.h> |
1da177e4 LT |
111 | #include <linux/netpoll.h> |
112 | #include <linux/rcupdate.h> | |
113 | #include <linux/delay.h> | |
1da177e4 | 114 | #include <net/iw_handler.h> |
1da177e4 | 115 | #include <asm/current.h> |
5bdb9886 | 116 | #include <linux/audit.h> |
db217334 | 117 | #include <linux/dmaengine.h> |
f6a78bfc | 118 | #include <linux/err.h> |
c7fa9d18 | 119 | #include <linux/ctype.h> |
723e98b7 | 120 | #include <linux/if_arp.h> |
6de329e2 | 121 | #include <linux/if_vlan.h> |
8f0f2223 | 122 | #include <linux/ip.h> |
ad55dcaf | 123 | #include <net/ip.h> |
25cd9ba0 | 124 | #include <net/mpls.h> |
8f0f2223 DM |
125 | #include <linux/ipv6.h> |
126 | #include <linux/in.h> | |
b6b2fed1 DM |
127 | #include <linux/jhash.h> |
128 | #include <linux/random.h> | |
9cbc1cb8 | 129 | #include <trace/events/napi.h> |
cf66ba58 | 130 | #include <trace/events/net.h> |
07dc22e7 | 131 | #include <trace/events/skb.h> |
caeda9b9 | 132 | #include <linux/inetdevice.h> |
c445477d | 133 | #include <linux/cpu_rmap.h> |
c5905afb | 134 | #include <linux/static_key.h> |
af12fa6e | 135 | #include <linux/hashtable.h> |
60877a32 | 136 | #include <linux/vmalloc.h> |
529d0489 | 137 | #include <linux/if_macvlan.h> |
e7fd2885 | 138 | #include <linux/errqueue.h> |
3b47d303 | 139 | #include <linux/hrtimer.h> |
357b6cc5 | 140 | #include <linux/netfilter_ingress.h> |
40e4e713 | 141 | #include <linux/crash_dump.h> |
b72b5bf6 | 142 | #include <linux/sctp.h> |
ae847f40 | 143 | #include <net/udp_tunnel.h> |
6621dd29 | 144 | #include <linux/net_namespace.h> |
aaa5d90b | 145 | #include <linux/indirect_call_wrapper.h> |
af3836df | 146 | #include <net/devlink.h> |
bd869245 | 147 | #include <linux/pm_runtime.h> |
3744741a | 148 | #include <linux/prandom.h> |
1da177e4 | 149 | |
342709ef PE |
150 | #include "net-sysfs.h" |
151 | ||
d565b0a1 HX |
152 | #define MAX_GRO_SKBS 8 |
153 | ||
5d38a079 HX |
154 | /* This should be increased if a protocol with a bigger head is added. */ |
155 | #define GRO_MAX_HEAD (MAX_HEADER + 128) | |
156 | ||
1da177e4 | 157 | static DEFINE_SPINLOCK(ptype_lock); |
62532da9 | 158 | static DEFINE_SPINLOCK(offload_lock); |
900ff8c6 CW |
159 | struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly; |
160 | struct list_head ptype_all __read_mostly; /* Taps */ | |
62532da9 | 161 | static struct list_head offload_base __read_mostly; |
1da177e4 | 162 | |
ae78dbfa | 163 | static int netif_rx_internal(struct sk_buff *skb); |
54951194 | 164 | static int call_netdevice_notifiers_info(unsigned long val, |
54951194 | 165 | struct netdev_notifier_info *info); |
26372605 PM |
166 | static int call_netdevice_notifiers_extack(unsigned long val, |
167 | struct net_device *dev, | |
168 | struct netlink_ext_ack *extack); | |
90b602f8 | 169 | static struct napi_struct *napi_by_id(unsigned int napi_id); |
ae78dbfa | 170 | |
1da177e4 | 171 | /* |
7562f876 | 172 | * The @dev_base_head list is protected by @dev_base_lock and the rtnl |
1da177e4 LT |
173 | * semaphore. |
174 | * | |
c6d14c84 | 175 | * Pure readers hold dev_base_lock for reading, or rcu_read_lock() |
1da177e4 LT |
176 | * |
177 | * Writers must hold the rtnl semaphore while they loop through the | |
7562f876 | 178 | * dev_base_head list, and hold dev_base_lock for writing when they do the |
1da177e4 LT |
179 | * actual updates. This allows pure readers to access the list even |
180 | * while a writer is preparing to update it. | |
181 | * | |
182 | * To put it another way, dev_base_lock is held for writing only to | |
183 | * protect against pure readers; the rtnl semaphore provides the | |
184 | * protection against other writers. | |
185 | * | |
186 | * See, for example usages, register_netdevice() and | |
187 | * unregister_netdevice(), which must be called with the rtnl | |
188 | * semaphore held. | |
189 | */ | |
1da177e4 | 190 | DEFINE_RWLOCK(dev_base_lock); |
1da177e4 LT |
191 | EXPORT_SYMBOL(dev_base_lock); |
192 | ||
6c557001 FW |
193 | static DEFINE_MUTEX(ifalias_mutex); |
194 | ||
af12fa6e ET |
195 | /* protects napi_hash addition/deletion and napi_gen_id */ |
196 | static DEFINE_SPINLOCK(napi_hash_lock); | |
197 | ||
52bd2d62 | 198 | static unsigned int napi_gen_id = NR_CPUS; |
6180d9de | 199 | static DEFINE_READ_MOSTLY_HASHTABLE(napi_hash, 8); |
af12fa6e | 200 | |
11d6011c | 201 | static DECLARE_RWSEM(devnet_rename_sem); |
c91f6df2 | 202 | |
4e985ada TG |
203 | static inline void dev_base_seq_inc(struct net *net) |
204 | { | |
643aa9cb | 205 | while (++net->dev_base_seq == 0) |
206 | ; | |
4e985ada TG |
207 | } |
208 | ||
881d966b | 209 | static inline struct hlist_head *dev_name_hash(struct net *net, const char *name) |
1da177e4 | 210 | { |
8387ff25 | 211 | unsigned int hash = full_name_hash(net, name, strnlen(name, IFNAMSIZ)); |
95c96174 | 212 | |
08e9897d | 213 | return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)]; |
1da177e4 LT |
214 | } |
215 | ||
881d966b | 216 | static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex) |
1da177e4 | 217 | { |
7c28bd0b | 218 | return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)]; |
1da177e4 LT |
219 | } |
220 | ||
e36fa2f7 | 221 | static inline void rps_lock(struct softnet_data *sd) |
152102c7 CG |
222 | { |
223 | #ifdef CONFIG_RPS | |
e36fa2f7 | 224 | spin_lock(&sd->input_pkt_queue.lock); |
152102c7 CG |
225 | #endif |
226 | } | |
227 | ||
e36fa2f7 | 228 | static inline void rps_unlock(struct softnet_data *sd) |
152102c7 CG |
229 | { |
230 | #ifdef CONFIG_RPS | |
e36fa2f7 | 231 | spin_unlock(&sd->input_pkt_queue.lock); |
152102c7 CG |
232 | #endif |
233 | } | |
234 | ||
ff927412 JP |
235 | static struct netdev_name_node *netdev_name_node_alloc(struct net_device *dev, |
236 | const char *name) | |
237 | { | |
238 | struct netdev_name_node *name_node; | |
239 | ||
240 | name_node = kmalloc(sizeof(*name_node), GFP_KERNEL); | |
241 | if (!name_node) | |
242 | return NULL; | |
243 | INIT_HLIST_NODE(&name_node->hlist); | |
244 | name_node->dev = dev; | |
245 | name_node->name = name; | |
246 | return name_node; | |
247 | } | |
248 | ||
249 | static struct netdev_name_node * | |
250 | netdev_name_node_head_alloc(struct net_device *dev) | |
251 | { | |
36fbf1e5 JP |
252 | struct netdev_name_node *name_node; |
253 | ||
254 | name_node = netdev_name_node_alloc(dev, dev->name); | |
255 | if (!name_node) | |
256 | return NULL; | |
257 | INIT_LIST_HEAD(&name_node->list); | |
258 | return name_node; | |
ff927412 JP |
259 | } |
260 | ||
261 | static void netdev_name_node_free(struct netdev_name_node *name_node) | |
262 | { | |
263 | kfree(name_node); | |
264 | } | |
265 | ||
266 | static void netdev_name_node_add(struct net *net, | |
267 | struct netdev_name_node *name_node) | |
268 | { | |
269 | hlist_add_head_rcu(&name_node->hlist, | |
270 | dev_name_hash(net, name_node->name)); | |
271 | } | |
272 | ||
273 | static void netdev_name_node_del(struct netdev_name_node *name_node) | |
274 | { | |
275 | hlist_del_rcu(&name_node->hlist); | |
276 | } | |
277 | ||
278 | static struct netdev_name_node *netdev_name_node_lookup(struct net *net, | |
279 | const char *name) | |
280 | { | |
281 | struct hlist_head *head = dev_name_hash(net, name); | |
282 | struct netdev_name_node *name_node; | |
283 | ||
284 | hlist_for_each_entry(name_node, head, hlist) | |
285 | if (!strcmp(name_node->name, name)) | |
286 | return name_node; | |
287 | return NULL; | |
288 | } | |
289 | ||
290 | static struct netdev_name_node *netdev_name_node_lookup_rcu(struct net *net, | |
291 | const char *name) | |
292 | { | |
293 | struct hlist_head *head = dev_name_hash(net, name); | |
294 | struct netdev_name_node *name_node; | |
295 | ||
296 | hlist_for_each_entry_rcu(name_node, head, hlist) | |
297 | if (!strcmp(name_node->name, name)) | |
298 | return name_node; | |
299 | return NULL; | |
300 | } | |
301 | ||
36fbf1e5 JP |
302 | int netdev_name_node_alt_create(struct net_device *dev, const char *name) |
303 | { | |
304 | struct netdev_name_node *name_node; | |
305 | struct net *net = dev_net(dev); | |
306 | ||
307 | name_node = netdev_name_node_lookup(net, name); | |
308 | if (name_node) | |
309 | return -EEXIST; | |
310 | name_node = netdev_name_node_alloc(dev, name); | |
311 | if (!name_node) | |
312 | return -ENOMEM; | |
313 | netdev_name_node_add(net, name_node); | |
314 | /* The node that holds dev->name acts as a head of per-device list. */ | |
315 | list_add_tail(&name_node->list, &dev->name_node->list); | |
316 | ||
317 | return 0; | |
318 | } | |
319 | EXPORT_SYMBOL(netdev_name_node_alt_create); | |
320 | ||
321 | static void __netdev_name_node_alt_destroy(struct netdev_name_node *name_node) | |
322 | { | |
323 | list_del(&name_node->list); | |
324 | netdev_name_node_del(name_node); | |
325 | kfree(name_node->name); | |
326 | netdev_name_node_free(name_node); | |
327 | } | |
328 | ||
329 | int netdev_name_node_alt_destroy(struct net_device *dev, const char *name) | |
330 | { | |
331 | struct netdev_name_node *name_node; | |
332 | struct net *net = dev_net(dev); | |
333 | ||
334 | name_node = netdev_name_node_lookup(net, name); | |
335 | if (!name_node) | |
336 | return -ENOENT; | |
e08ad805 ED |
337 | /* lookup might have found our primary name or a name belonging |
338 | * to another device. | |
339 | */ | |
340 | if (name_node == dev->name_node || name_node->dev != dev) | |
341 | return -EINVAL; | |
342 | ||
36fbf1e5 JP |
343 | __netdev_name_node_alt_destroy(name_node); |
344 | ||
345 | return 0; | |
346 | } | |
347 | EXPORT_SYMBOL(netdev_name_node_alt_destroy); | |
348 | ||
349 | static void netdev_name_node_alt_flush(struct net_device *dev) | |
350 | { | |
351 | struct netdev_name_node *name_node, *tmp; | |
352 | ||
353 | list_for_each_entry_safe(name_node, tmp, &dev->name_node->list, list) | |
354 | __netdev_name_node_alt_destroy(name_node); | |
355 | } | |
356 | ||
ce286d32 | 357 | /* Device list insertion */ |
53759be9 | 358 | static void list_netdevice(struct net_device *dev) |
ce286d32 | 359 | { |
c346dca1 | 360 | struct net *net = dev_net(dev); |
ce286d32 EB |
361 | |
362 | ASSERT_RTNL(); | |
363 | ||
364 | write_lock_bh(&dev_base_lock); | |
c6d14c84 | 365 | list_add_tail_rcu(&dev->dev_list, &net->dev_base_head); |
ff927412 | 366 | netdev_name_node_add(net, dev->name_node); |
fb699dfd ED |
367 | hlist_add_head_rcu(&dev->index_hlist, |
368 | dev_index_hash(net, dev->ifindex)); | |
ce286d32 | 369 | write_unlock_bh(&dev_base_lock); |
4e985ada TG |
370 | |
371 | dev_base_seq_inc(net); | |
ce286d32 EB |
372 | } |
373 | ||
fb699dfd ED |
374 | /* Device list removal |
375 | * caller must respect a RCU grace period before freeing/reusing dev | |
376 | */ | |
ce286d32 EB |
377 | static void unlist_netdevice(struct net_device *dev) |
378 | { | |
379 | ASSERT_RTNL(); | |
380 | ||
381 | /* Unlink dev from the device chain */ | |
382 | write_lock_bh(&dev_base_lock); | |
c6d14c84 | 383 | list_del_rcu(&dev->dev_list); |
ff927412 | 384 | netdev_name_node_del(dev->name_node); |
fb699dfd | 385 | hlist_del_rcu(&dev->index_hlist); |
ce286d32 | 386 | write_unlock_bh(&dev_base_lock); |
4e985ada TG |
387 | |
388 | dev_base_seq_inc(dev_net(dev)); | |
ce286d32 EB |
389 | } |
390 | ||
1da177e4 LT |
391 | /* |
392 | * Our notifier list | |
393 | */ | |
394 | ||
f07d5b94 | 395 | static RAW_NOTIFIER_HEAD(netdev_chain); |
1da177e4 LT |
396 | |
397 | /* | |
398 | * Device drivers call our routines to queue packets here. We empty the | |
399 | * queue in the local softnet handler. | |
400 | */ | |
bea3348e | 401 | |
9958da05 | 402 | DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data); |
d1b19dff | 403 | EXPORT_PER_CPU_SYMBOL(softnet_data); |
1da177e4 | 404 | |
1a33e10e CW |
405 | #ifdef CONFIG_LOCKDEP |
406 | /* | |
407 | * register_netdevice() inits txq->_xmit_lock and sets lockdep class | |
408 | * according to dev->type | |
409 | */ | |
410 | static const unsigned short netdev_lock_type[] = { | |
411 | ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25, | |
412 | ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET, | |
413 | ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM, | |
414 | ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP, | |
415 | ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD, | |
416 | ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25, | |
417 | ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP, | |
418 | ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD, | |
419 | ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI, | |
420 | ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE, | |
421 | ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET, | |
422 | ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL, | |
423 | ARPHRD_FCFABRIC, ARPHRD_IEEE80211, ARPHRD_IEEE80211_PRISM, | |
424 | ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET, ARPHRD_PHONET_PIPE, | |
425 | ARPHRD_IEEE802154, ARPHRD_VOID, ARPHRD_NONE}; | |
426 | ||
427 | static const char *const netdev_lock_name[] = { | |
428 | "_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25", | |
429 | "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET", | |
430 | "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM", | |
431 | "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP", | |
432 | "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD", | |
433 | "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25", | |
434 | "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP", | |
435 | "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD", | |
436 | "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI", | |
437 | "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE", | |
438 | "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET", | |
439 | "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL", | |
440 | "_xmit_FCFABRIC", "_xmit_IEEE80211", "_xmit_IEEE80211_PRISM", | |
441 | "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", "_xmit_PHONET_PIPE", | |
442 | "_xmit_IEEE802154", "_xmit_VOID", "_xmit_NONE"}; | |
443 | ||
444 | static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)]; | |
845e0ebb | 445 | static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)]; |
1a33e10e CW |
446 | |
447 | static inline unsigned short netdev_lock_pos(unsigned short dev_type) | |
448 | { | |
449 | int i; | |
450 | ||
451 | for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++) | |
452 | if (netdev_lock_type[i] == dev_type) | |
453 | return i; | |
454 | /* the last key is used by default */ | |
455 | return ARRAY_SIZE(netdev_lock_type) - 1; | |
456 | } | |
457 | ||
458 | static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock, | |
459 | unsigned short dev_type) | |
460 | { | |
461 | int i; | |
462 | ||
463 | i = netdev_lock_pos(dev_type); | |
464 | lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i], | |
465 | netdev_lock_name[i]); | |
466 | } | |
845e0ebb CW |
467 | |
468 | static inline void netdev_set_addr_lockdep_class(struct net_device *dev) | |
469 | { | |
470 | int i; | |
471 | ||
472 | i = netdev_lock_pos(dev->type); | |
473 | lockdep_set_class_and_name(&dev->addr_list_lock, | |
474 | &netdev_addr_lock_key[i], | |
475 | netdev_lock_name[i]); | |
476 | } | |
1a33e10e CW |
477 | #else |
478 | static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock, | |
479 | unsigned short dev_type) | |
480 | { | |
481 | } | |
845e0ebb CW |
482 | |
483 | static inline void netdev_set_addr_lockdep_class(struct net_device *dev) | |
484 | { | |
485 | } | |
1a33e10e CW |
486 | #endif |
487 | ||
1da177e4 | 488 | /******************************************************************************* |
eb13da1a | 489 | * |
490 | * Protocol management and registration routines | |
491 | * | |
492 | *******************************************************************************/ | |
1da177e4 | 493 | |
1da177e4 | 494 | |
1da177e4 LT |
495 | /* |
496 | * Add a protocol ID to the list. Now that the input handler is | |
497 | * smarter we can dispense with all the messy stuff that used to be | |
498 | * here. | |
499 | * | |
500 | * BEWARE!!! Protocol handlers, mangling input packets, | |
501 | * MUST BE last in hash buckets and checking protocol handlers | |
502 | * MUST start from promiscuous ptype_all chain in net_bh. | |
503 | * It is true now, do not change it. | |
504 | * Explanation follows: if protocol handler, mangling packet, will | |
505 | * be the first on list, it is not able to sense, that packet | |
506 | * is cloned and should be copied-on-write, so that it will | |
507 | * change it and subsequent readers will get broken packet. | |
508 | * --ANK (980803) | |
509 | */ | |
510 | ||
c07b68e8 ED |
511 | static inline struct list_head *ptype_head(const struct packet_type *pt) |
512 | { | |
513 | if (pt->type == htons(ETH_P_ALL)) | |
7866a621 | 514 | return pt->dev ? &pt->dev->ptype_all : &ptype_all; |
c07b68e8 | 515 | else |
7866a621 SN |
516 | return pt->dev ? &pt->dev->ptype_specific : |
517 | &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK]; | |
c07b68e8 ED |
518 | } |
519 | ||
1da177e4 LT |
520 | /** |
521 | * dev_add_pack - add packet handler | |
522 | * @pt: packet type declaration | |
523 | * | |
524 | * Add a protocol handler to the networking stack. The passed &packet_type | |
525 | * is linked into kernel lists and may not be freed until it has been | |
526 | * removed from the kernel lists. | |
527 | * | |
4ec93edb | 528 | * This call does not sleep therefore it can not |
1da177e4 LT |
529 | * guarantee all CPU's that are in middle of receiving packets |
530 | * will see the new packet type (until the next received packet). | |
531 | */ | |
532 | ||
533 | void dev_add_pack(struct packet_type *pt) | |
534 | { | |
c07b68e8 | 535 | struct list_head *head = ptype_head(pt); |
1da177e4 | 536 | |
c07b68e8 ED |
537 | spin_lock(&ptype_lock); |
538 | list_add_rcu(&pt->list, head); | |
539 | spin_unlock(&ptype_lock); | |
1da177e4 | 540 | } |
d1b19dff | 541 | EXPORT_SYMBOL(dev_add_pack); |
1da177e4 | 542 | |
1da177e4 LT |
543 | /** |
544 | * __dev_remove_pack - remove packet handler | |
545 | * @pt: packet type declaration | |
546 | * | |
547 | * Remove a protocol handler that was previously added to the kernel | |
548 | * protocol handlers by dev_add_pack(). The passed &packet_type is removed | |
549 | * from the kernel lists and can be freed or reused once this function | |
4ec93edb | 550 | * returns. |
1da177e4 LT |
551 | * |
552 | * The packet type might still be in use by receivers | |
553 | * and must not be freed until after all the CPU's have gone | |
554 | * through a quiescent state. | |
555 | */ | |
556 | void __dev_remove_pack(struct packet_type *pt) | |
557 | { | |
c07b68e8 | 558 | struct list_head *head = ptype_head(pt); |
1da177e4 LT |
559 | struct packet_type *pt1; |
560 | ||
c07b68e8 | 561 | spin_lock(&ptype_lock); |
1da177e4 LT |
562 | |
563 | list_for_each_entry(pt1, head, list) { | |
564 | if (pt == pt1) { | |
565 | list_del_rcu(&pt->list); | |
566 | goto out; | |
567 | } | |
568 | } | |
569 | ||
7b6cd1ce | 570 | pr_warn("dev_remove_pack: %p not found\n", pt); |
1da177e4 | 571 | out: |
c07b68e8 | 572 | spin_unlock(&ptype_lock); |
1da177e4 | 573 | } |
d1b19dff ED |
574 | EXPORT_SYMBOL(__dev_remove_pack); |
575 | ||
1da177e4 LT |
576 | /** |
577 | * dev_remove_pack - remove packet handler | |
578 | * @pt: packet type declaration | |
579 | * | |
580 | * Remove a protocol handler that was previously added to the kernel | |
581 | * protocol handlers by dev_add_pack(). The passed &packet_type is removed | |
582 | * from the kernel lists and can be freed or reused once this function | |
583 | * returns. | |
584 | * | |
585 | * This call sleeps to guarantee that no CPU is looking at the packet | |
586 | * type after return. | |
587 | */ | |
588 | void dev_remove_pack(struct packet_type *pt) | |
589 | { | |
590 | __dev_remove_pack(pt); | |
4ec93edb | 591 | |
1da177e4 LT |
592 | synchronize_net(); |
593 | } | |
d1b19dff | 594 | EXPORT_SYMBOL(dev_remove_pack); |
1da177e4 | 595 | |
62532da9 VY |
596 | |
597 | /** | |
598 | * dev_add_offload - register offload handlers | |
599 | * @po: protocol offload declaration | |
600 | * | |
601 | * Add protocol offload handlers to the networking stack. The passed | |
602 | * &proto_offload is linked into kernel lists and may not be freed until | |
603 | * it has been removed from the kernel lists. | |
604 | * | |
605 | * This call does not sleep therefore it can not | |
606 | * guarantee all CPU's that are in middle of receiving packets | |
607 | * will see the new offload handlers (until the next received packet). | |
608 | */ | |
609 | void dev_add_offload(struct packet_offload *po) | |
610 | { | |
bdef7de4 | 611 | struct packet_offload *elem; |
62532da9 VY |
612 | |
613 | spin_lock(&offload_lock); | |
bdef7de4 DM |
614 | list_for_each_entry(elem, &offload_base, list) { |
615 | if (po->priority < elem->priority) | |
616 | break; | |
617 | } | |
618 | list_add_rcu(&po->list, elem->list.prev); | |
62532da9 VY |
619 | spin_unlock(&offload_lock); |
620 | } | |
621 | EXPORT_SYMBOL(dev_add_offload); | |
622 | ||
623 | /** | |
624 | * __dev_remove_offload - remove offload handler | |
625 | * @po: packet offload declaration | |
626 | * | |
627 | * Remove a protocol offload handler that was previously added to the | |
628 | * kernel offload handlers by dev_add_offload(). The passed &offload_type | |
629 | * is removed from the kernel lists and can be freed or reused once this | |
630 | * function returns. | |
631 | * | |
632 | * The packet type might still be in use by receivers | |
633 | * and must not be freed until after all the CPU's have gone | |
634 | * through a quiescent state. | |
635 | */ | |
1d143d9f | 636 | static void __dev_remove_offload(struct packet_offload *po) |
62532da9 VY |
637 | { |
638 | struct list_head *head = &offload_base; | |
639 | struct packet_offload *po1; | |
640 | ||
c53aa505 | 641 | spin_lock(&offload_lock); |
62532da9 VY |
642 | |
643 | list_for_each_entry(po1, head, list) { | |
644 | if (po == po1) { | |
645 | list_del_rcu(&po->list); | |
646 | goto out; | |
647 | } | |
648 | } | |
649 | ||
650 | pr_warn("dev_remove_offload: %p not found\n", po); | |
651 | out: | |
c53aa505 | 652 | spin_unlock(&offload_lock); |
62532da9 | 653 | } |
62532da9 VY |
654 | |
655 | /** | |
656 | * dev_remove_offload - remove packet offload handler | |
657 | * @po: packet offload declaration | |
658 | * | |
659 | * Remove a packet offload handler that was previously added to the kernel | |
660 | * offload handlers by dev_add_offload(). The passed &offload_type is | |
661 | * removed from the kernel lists and can be freed or reused once this | |
662 | * function returns. | |
663 | * | |
664 | * This call sleeps to guarantee that no CPU is looking at the packet | |
665 | * type after return. | |
666 | */ | |
667 | void dev_remove_offload(struct packet_offload *po) | |
668 | { | |
669 | __dev_remove_offload(po); | |
670 | ||
671 | synchronize_net(); | |
672 | } | |
673 | EXPORT_SYMBOL(dev_remove_offload); | |
674 | ||
1da177e4 | 675 | /****************************************************************************** |
eb13da1a | 676 | * |
677 | * Device Boot-time Settings Routines | |
678 | * | |
679 | ******************************************************************************/ | |
1da177e4 LT |
680 | |
681 | /* Boot time configuration table */ | |
682 | static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX]; | |
683 | ||
684 | /** | |
685 | * netdev_boot_setup_add - add new setup entry | |
686 | * @name: name of the device | |
687 | * @map: configured settings for the device | |
688 | * | |
689 | * Adds new setup entry to the dev_boot_setup list. The function | |
690 | * returns 0 on error and 1 on success. This is a generic routine to | |
691 | * all netdevices. | |
692 | */ | |
693 | static int netdev_boot_setup_add(char *name, struct ifmap *map) | |
694 | { | |
695 | struct netdev_boot_setup *s; | |
696 | int i; | |
697 | ||
698 | s = dev_boot_setup; | |
699 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) { | |
700 | if (s[i].name[0] == '\0' || s[i].name[0] == ' ') { | |
701 | memset(s[i].name, 0, sizeof(s[i].name)); | |
93b3cff9 | 702 | strlcpy(s[i].name, name, IFNAMSIZ); |
1da177e4 LT |
703 | memcpy(&s[i].map, map, sizeof(s[i].map)); |
704 | break; | |
705 | } | |
706 | } | |
707 | ||
708 | return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1; | |
709 | } | |
710 | ||
711 | /** | |
722c9a0c | 712 | * netdev_boot_setup_check - check boot time settings |
713 | * @dev: the netdevice | |
1da177e4 | 714 | * |
722c9a0c | 715 | * Check boot time settings for the device. |
716 | * The found settings are set for the device to be used | |
717 | * later in the device probing. | |
718 | * Returns 0 if no settings found, 1 if they are. | |
1da177e4 LT |
719 | */ |
720 | int netdev_boot_setup_check(struct net_device *dev) | |
721 | { | |
722 | struct netdev_boot_setup *s = dev_boot_setup; | |
723 | int i; | |
724 | ||
725 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) { | |
726 | if (s[i].name[0] != '\0' && s[i].name[0] != ' ' && | |
93b3cff9 | 727 | !strcmp(dev->name, s[i].name)) { |
722c9a0c | 728 | dev->irq = s[i].map.irq; |
729 | dev->base_addr = s[i].map.base_addr; | |
730 | dev->mem_start = s[i].map.mem_start; | |
731 | dev->mem_end = s[i].map.mem_end; | |
1da177e4 LT |
732 | return 1; |
733 | } | |
734 | } | |
735 | return 0; | |
736 | } | |
d1b19dff | 737 | EXPORT_SYMBOL(netdev_boot_setup_check); |
1da177e4 LT |
738 | |
739 | ||
740 | /** | |
722c9a0c | 741 | * netdev_boot_base - get address from boot time settings |
742 | * @prefix: prefix for network device | |
743 | * @unit: id for network device | |
744 | * | |
745 | * Check boot time settings for the base address of device. | |
746 | * The found settings are set for the device to be used | |
747 | * later in the device probing. | |
748 | * Returns 0 if no settings found. | |
1da177e4 LT |
749 | */ |
750 | unsigned long netdev_boot_base(const char *prefix, int unit) | |
751 | { | |
752 | const struct netdev_boot_setup *s = dev_boot_setup; | |
753 | char name[IFNAMSIZ]; | |
754 | int i; | |
755 | ||
756 | sprintf(name, "%s%d", prefix, unit); | |
757 | ||
758 | /* | |
759 | * If device already registered then return base of 1 | |
760 | * to indicate not to probe for this interface | |
761 | */ | |
881d966b | 762 | if (__dev_get_by_name(&init_net, name)) |
1da177e4 LT |
763 | return 1; |
764 | ||
765 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) | |
766 | if (!strcmp(name, s[i].name)) | |
767 | return s[i].map.base_addr; | |
768 | return 0; | |
769 | } | |
770 | ||
771 | /* | |
772 | * Saves at boot time configured settings for any netdevice. | |
773 | */ | |
774 | int __init netdev_boot_setup(char *str) | |
775 | { | |
776 | int ints[5]; | |
777 | struct ifmap map; | |
778 | ||
779 | str = get_options(str, ARRAY_SIZE(ints), ints); | |
780 | if (!str || !*str) | |
781 | return 0; | |
782 | ||
783 | /* Save settings */ | |
784 | memset(&map, 0, sizeof(map)); | |
785 | if (ints[0] > 0) | |
786 | map.irq = ints[1]; | |
787 | if (ints[0] > 1) | |
788 | map.base_addr = ints[2]; | |
789 | if (ints[0] > 2) | |
790 | map.mem_start = ints[3]; | |
791 | if (ints[0] > 3) | |
792 | map.mem_end = ints[4]; | |
793 | ||
794 | /* Add new entry to the list */ | |
795 | return netdev_boot_setup_add(str, &map); | |
796 | } | |
797 | ||
798 | __setup("netdev=", netdev_boot_setup); | |
799 | ||
800 | /******************************************************************************* | |
eb13da1a | 801 | * |
802 | * Device Interface Subroutines | |
803 | * | |
804 | *******************************************************************************/ | |
1da177e4 | 805 | |
a54acb3a ND |
806 | /** |
807 | * dev_get_iflink - get 'iflink' value of a interface | |
808 | * @dev: targeted interface | |
809 | * | |
810 | * Indicates the ifindex the interface is linked to. | |
811 | * Physical interfaces have the same 'ifindex' and 'iflink' values. | |
812 | */ | |
813 | ||
814 | int dev_get_iflink(const struct net_device *dev) | |
815 | { | |
816 | if (dev->netdev_ops && dev->netdev_ops->ndo_get_iflink) | |
817 | return dev->netdev_ops->ndo_get_iflink(dev); | |
818 | ||
7a66bbc9 | 819 | return dev->ifindex; |
a54acb3a ND |
820 | } |
821 | EXPORT_SYMBOL(dev_get_iflink); | |
822 | ||
fc4099f1 PS |
823 | /** |
824 | * dev_fill_metadata_dst - Retrieve tunnel egress information. | |
825 | * @dev: targeted interface | |
826 | * @skb: The packet. | |
827 | * | |
828 | * For better visibility of tunnel traffic OVS needs to retrieve | |
829 | * egress tunnel information for a packet. Following API allows | |
830 | * user to get this info. | |
831 | */ | |
832 | int dev_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) | |
833 | { | |
834 | struct ip_tunnel_info *info; | |
835 | ||
836 | if (!dev->netdev_ops || !dev->netdev_ops->ndo_fill_metadata_dst) | |
837 | return -EINVAL; | |
838 | ||
839 | info = skb_tunnel_info_unclone(skb); | |
840 | if (!info) | |
841 | return -ENOMEM; | |
842 | if (unlikely(!(info->mode & IP_TUNNEL_INFO_TX))) | |
843 | return -EINVAL; | |
844 | ||
845 | return dev->netdev_ops->ndo_fill_metadata_dst(dev, skb); | |
846 | } | |
847 | EXPORT_SYMBOL_GPL(dev_fill_metadata_dst); | |
848 | ||
1da177e4 LT |
849 | /** |
850 | * __dev_get_by_name - find a device by its name | |
c4ea43c5 | 851 | * @net: the applicable net namespace |
1da177e4 LT |
852 | * @name: name to find |
853 | * | |
854 | * Find an interface by name. Must be called under RTNL semaphore | |
855 | * or @dev_base_lock. If the name is found a pointer to the device | |
856 | * is returned. If the name is not found then %NULL is returned. The | |
857 | * reference counters are not incremented so the caller must be | |
858 | * careful with locks. | |
859 | */ | |
860 | ||
881d966b | 861 | struct net_device *__dev_get_by_name(struct net *net, const char *name) |
1da177e4 | 862 | { |
ff927412 | 863 | struct netdev_name_node *node_name; |
1da177e4 | 864 | |
ff927412 JP |
865 | node_name = netdev_name_node_lookup(net, name); |
866 | return node_name ? node_name->dev : NULL; | |
1da177e4 | 867 | } |
d1b19dff | 868 | EXPORT_SYMBOL(__dev_get_by_name); |
1da177e4 | 869 | |
72c9528b | 870 | /** |
722c9a0c | 871 | * dev_get_by_name_rcu - find a device by its name |
872 | * @net: the applicable net namespace | |
873 | * @name: name to find | |
874 | * | |
875 | * Find an interface by name. | |
876 | * If the name is found a pointer to the device is returned. | |
877 | * If the name is not found then %NULL is returned. | |
878 | * The reference counters are not incremented so the caller must be | |
879 | * careful with locks. The caller must hold RCU lock. | |
72c9528b ED |
880 | */ |
881 | ||
882 | struct net_device *dev_get_by_name_rcu(struct net *net, const char *name) | |
883 | { | |
ff927412 | 884 | struct netdev_name_node *node_name; |
72c9528b | 885 | |
ff927412 JP |
886 | node_name = netdev_name_node_lookup_rcu(net, name); |
887 | return node_name ? node_name->dev : NULL; | |
72c9528b ED |
888 | } |
889 | EXPORT_SYMBOL(dev_get_by_name_rcu); | |
890 | ||
1da177e4 LT |
891 | /** |
892 | * dev_get_by_name - find a device by its name | |
c4ea43c5 | 893 | * @net: the applicable net namespace |
1da177e4 LT |
894 | * @name: name to find |
895 | * | |
896 | * Find an interface by name. This can be called from any | |
897 | * context and does its own locking. The returned handle has | |
898 | * the usage count incremented and the caller must use dev_put() to | |
899 | * release it when it is no longer needed. %NULL is returned if no | |
900 | * matching device is found. | |
901 | */ | |
902 | ||
881d966b | 903 | struct net_device *dev_get_by_name(struct net *net, const char *name) |
1da177e4 LT |
904 | { |
905 | struct net_device *dev; | |
906 | ||
72c9528b ED |
907 | rcu_read_lock(); |
908 | dev = dev_get_by_name_rcu(net, name); | |
1da177e4 LT |
909 | if (dev) |
910 | dev_hold(dev); | |
72c9528b | 911 | rcu_read_unlock(); |
1da177e4 LT |
912 | return dev; |
913 | } | |
d1b19dff | 914 | EXPORT_SYMBOL(dev_get_by_name); |
1da177e4 LT |
915 | |
916 | /** | |
917 | * __dev_get_by_index - find a device by its ifindex | |
c4ea43c5 | 918 | * @net: the applicable net namespace |
1da177e4 LT |
919 | * @ifindex: index of device |
920 | * | |
921 | * Search for an interface by index. Returns %NULL if the device | |
922 | * is not found or a pointer to the device. The device has not | |
923 | * had its reference counter increased so the caller must be careful | |
924 | * about locking. The caller must hold either the RTNL semaphore | |
925 | * or @dev_base_lock. | |
926 | */ | |
927 | ||
881d966b | 928 | struct net_device *__dev_get_by_index(struct net *net, int ifindex) |
1da177e4 | 929 | { |
0bd8d536 ED |
930 | struct net_device *dev; |
931 | struct hlist_head *head = dev_index_hash(net, ifindex); | |
1da177e4 | 932 | |
b67bfe0d | 933 | hlist_for_each_entry(dev, head, index_hlist) |
1da177e4 LT |
934 | if (dev->ifindex == ifindex) |
935 | return dev; | |
0bd8d536 | 936 | |
1da177e4 LT |
937 | return NULL; |
938 | } | |
d1b19dff | 939 | EXPORT_SYMBOL(__dev_get_by_index); |
1da177e4 | 940 | |
fb699dfd ED |
941 | /** |
942 | * dev_get_by_index_rcu - find a device by its ifindex | |
943 | * @net: the applicable net namespace | |
944 | * @ifindex: index of device | |
945 | * | |
946 | * Search for an interface by index. Returns %NULL if the device | |
947 | * is not found or a pointer to the device. The device has not | |
948 | * had its reference counter increased so the caller must be careful | |
949 | * about locking. The caller must hold RCU lock. | |
950 | */ | |
951 | ||
952 | struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex) | |
953 | { | |
fb699dfd ED |
954 | struct net_device *dev; |
955 | struct hlist_head *head = dev_index_hash(net, ifindex); | |
956 | ||
b67bfe0d | 957 | hlist_for_each_entry_rcu(dev, head, index_hlist) |
fb699dfd ED |
958 | if (dev->ifindex == ifindex) |
959 | return dev; | |
960 | ||
961 | return NULL; | |
962 | } | |
963 | EXPORT_SYMBOL(dev_get_by_index_rcu); | |
964 | ||
1da177e4 LT |
965 | |
966 | /** | |
967 | * dev_get_by_index - find a device by its ifindex | |
c4ea43c5 | 968 | * @net: the applicable net namespace |
1da177e4 LT |
969 | * @ifindex: index of device |
970 | * | |
971 | * Search for an interface by index. Returns NULL if the device | |
972 | * is not found or a pointer to the device. The device returned has | |
973 | * had a reference added and the pointer is safe until the user calls | |
974 | * dev_put to indicate they have finished with it. | |
975 | */ | |
976 | ||
881d966b | 977 | struct net_device *dev_get_by_index(struct net *net, int ifindex) |
1da177e4 LT |
978 | { |
979 | struct net_device *dev; | |
980 | ||
fb699dfd ED |
981 | rcu_read_lock(); |
982 | dev = dev_get_by_index_rcu(net, ifindex); | |
1da177e4 LT |
983 | if (dev) |
984 | dev_hold(dev); | |
fb699dfd | 985 | rcu_read_unlock(); |
1da177e4 LT |
986 | return dev; |
987 | } | |
d1b19dff | 988 | EXPORT_SYMBOL(dev_get_by_index); |
1da177e4 | 989 | |
90b602f8 ML |
990 | /** |
991 | * dev_get_by_napi_id - find a device by napi_id | |
992 | * @napi_id: ID of the NAPI struct | |
993 | * | |
994 | * Search for an interface by NAPI ID. Returns %NULL if the device | |
995 | * is not found or a pointer to the device. The device has not had | |
996 | * its reference counter increased so the caller must be careful | |
997 | * about locking. The caller must hold RCU lock. | |
998 | */ | |
999 | ||
1000 | struct net_device *dev_get_by_napi_id(unsigned int napi_id) | |
1001 | { | |
1002 | struct napi_struct *napi; | |
1003 | ||
1004 | WARN_ON_ONCE(!rcu_read_lock_held()); | |
1005 | ||
1006 | if (napi_id < MIN_NAPI_ID) | |
1007 | return NULL; | |
1008 | ||
1009 | napi = napi_by_id(napi_id); | |
1010 | ||
1011 | return napi ? napi->dev : NULL; | |
1012 | } | |
1013 | EXPORT_SYMBOL(dev_get_by_napi_id); | |
1014 | ||
5dbe7c17 NS |
1015 | /** |
1016 | * netdev_get_name - get a netdevice name, knowing its ifindex. | |
1017 | * @net: network namespace | |
1018 | * @name: a pointer to the buffer where the name will be stored. | |
1019 | * @ifindex: the ifindex of the interface to get the name from. | |
5dbe7c17 NS |
1020 | */ |
1021 | int netdev_get_name(struct net *net, char *name, int ifindex) | |
1022 | { | |
1023 | struct net_device *dev; | |
11d6011c | 1024 | int ret; |
5dbe7c17 | 1025 | |
11d6011c | 1026 | down_read(&devnet_rename_sem); |
5dbe7c17 | 1027 | rcu_read_lock(); |
11d6011c | 1028 | |
5dbe7c17 NS |
1029 | dev = dev_get_by_index_rcu(net, ifindex); |
1030 | if (!dev) { | |
11d6011c AD |
1031 | ret = -ENODEV; |
1032 | goto out; | |
5dbe7c17 NS |
1033 | } |
1034 | ||
1035 | strcpy(name, dev->name); | |
5dbe7c17 | 1036 | |
11d6011c AD |
1037 | ret = 0; |
1038 | out: | |
1039 | rcu_read_unlock(); | |
1040 | up_read(&devnet_rename_sem); | |
1041 | return ret; | |
5dbe7c17 NS |
1042 | } |
1043 | ||
1da177e4 | 1044 | /** |
941666c2 | 1045 | * dev_getbyhwaddr_rcu - find a device by its hardware address |
c4ea43c5 | 1046 | * @net: the applicable net namespace |
1da177e4 LT |
1047 | * @type: media type of device |
1048 | * @ha: hardware address | |
1049 | * | |
1050 | * Search for an interface by MAC address. Returns NULL if the device | |
c506653d ED |
1051 | * is not found or a pointer to the device. |
1052 | * The caller must hold RCU or RTNL. | |
941666c2 | 1053 | * The returned device has not had its ref count increased |
1da177e4 LT |
1054 | * and the caller must therefore be careful about locking |
1055 | * | |
1da177e4 LT |
1056 | */ |
1057 | ||
941666c2 ED |
1058 | struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type, |
1059 | const char *ha) | |
1da177e4 LT |
1060 | { |
1061 | struct net_device *dev; | |
1062 | ||
941666c2 | 1063 | for_each_netdev_rcu(net, dev) |
1da177e4 LT |
1064 | if (dev->type == type && |
1065 | !memcmp(dev->dev_addr, ha, dev->addr_len)) | |
7562f876 PE |
1066 | return dev; |
1067 | ||
1068 | return NULL; | |
1da177e4 | 1069 | } |
941666c2 | 1070 | EXPORT_SYMBOL(dev_getbyhwaddr_rcu); |
cf309e3f | 1071 | |
881d966b | 1072 | struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type) |
4e9cac2b | 1073 | { |
99fe3c39 | 1074 | struct net_device *dev, *ret = NULL; |
4e9cac2b | 1075 | |
99fe3c39 ED |
1076 | rcu_read_lock(); |
1077 | for_each_netdev_rcu(net, dev) | |
1078 | if (dev->type == type) { | |
1079 | dev_hold(dev); | |
1080 | ret = dev; | |
1081 | break; | |
1082 | } | |
1083 | rcu_read_unlock(); | |
1084 | return ret; | |
1da177e4 | 1085 | } |
1da177e4 LT |
1086 | EXPORT_SYMBOL(dev_getfirstbyhwtype); |
1087 | ||
1088 | /** | |
6c555490 | 1089 | * __dev_get_by_flags - find any device with given flags |
c4ea43c5 | 1090 | * @net: the applicable net namespace |
1da177e4 LT |
1091 | * @if_flags: IFF_* values |
1092 | * @mask: bitmask of bits in if_flags to check | |
1093 | * | |
1094 | * Search for any interface with the given flags. Returns NULL if a device | |
bb69ae04 | 1095 | * is not found or a pointer to the device. Must be called inside |
6c555490 | 1096 | * rtnl_lock(), and result refcount is unchanged. |
1da177e4 LT |
1097 | */ |
1098 | ||
6c555490 WC |
1099 | struct net_device *__dev_get_by_flags(struct net *net, unsigned short if_flags, |
1100 | unsigned short mask) | |
1da177e4 | 1101 | { |
7562f876 | 1102 | struct net_device *dev, *ret; |
1da177e4 | 1103 | |
6c555490 WC |
1104 | ASSERT_RTNL(); |
1105 | ||
7562f876 | 1106 | ret = NULL; |
6c555490 | 1107 | for_each_netdev(net, dev) { |
1da177e4 | 1108 | if (((dev->flags ^ if_flags) & mask) == 0) { |
7562f876 | 1109 | ret = dev; |
1da177e4 LT |
1110 | break; |
1111 | } | |
1112 | } | |
7562f876 | 1113 | return ret; |
1da177e4 | 1114 | } |
6c555490 | 1115 | EXPORT_SYMBOL(__dev_get_by_flags); |
1da177e4 LT |
1116 | |
1117 | /** | |
1118 | * dev_valid_name - check if name is okay for network device | |
1119 | * @name: name string | |
1120 | * | |
1121 | * Network device names need to be valid file names to | |
4250b75b | 1122 | * allow sysfs to work. We also disallow any kind of |
c7fa9d18 | 1123 | * whitespace. |
1da177e4 | 1124 | */ |
95f050bf | 1125 | bool dev_valid_name(const char *name) |
1da177e4 | 1126 | { |
c7fa9d18 | 1127 | if (*name == '\0') |
95f050bf | 1128 | return false; |
a9d48205 | 1129 | if (strnlen(name, IFNAMSIZ) == IFNAMSIZ) |
95f050bf | 1130 | return false; |
c7fa9d18 | 1131 | if (!strcmp(name, ".") || !strcmp(name, "..")) |
95f050bf | 1132 | return false; |
c7fa9d18 DM |
1133 | |
1134 | while (*name) { | |
a4176a93 | 1135 | if (*name == '/' || *name == ':' || isspace(*name)) |
95f050bf | 1136 | return false; |
c7fa9d18 DM |
1137 | name++; |
1138 | } | |
95f050bf | 1139 | return true; |
1da177e4 | 1140 | } |
d1b19dff | 1141 | EXPORT_SYMBOL(dev_valid_name); |
1da177e4 LT |
1142 | |
1143 | /** | |
b267b179 EB |
1144 | * __dev_alloc_name - allocate a name for a device |
1145 | * @net: network namespace to allocate the device name in | |
1da177e4 | 1146 | * @name: name format string |
b267b179 | 1147 | * @buf: scratch buffer and result name string |
1da177e4 LT |
1148 | * |
1149 | * Passed a format string - eg "lt%d" it will try and find a suitable | |
3041a069 SH |
1150 | * id. It scans list of devices to build up a free map, then chooses |
1151 | * the first empty slot. The caller must hold the dev_base or rtnl lock | |
1152 | * while allocating the name and adding the device in order to avoid | |
1153 | * duplicates. | |
1154 | * Limited to bits_per_byte * page size devices (ie 32K on most platforms). | |
1155 | * Returns the number of the unit assigned or a negative errno code. | |
1da177e4 LT |
1156 | */ |
1157 | ||
b267b179 | 1158 | static int __dev_alloc_name(struct net *net, const char *name, char *buf) |
1da177e4 LT |
1159 | { |
1160 | int i = 0; | |
1da177e4 LT |
1161 | const char *p; |
1162 | const int max_netdevices = 8*PAGE_SIZE; | |
cfcabdcc | 1163 | unsigned long *inuse; |
1da177e4 LT |
1164 | struct net_device *d; |
1165 | ||
93809105 RV |
1166 | if (!dev_valid_name(name)) |
1167 | return -EINVAL; | |
1168 | ||
51f299dd | 1169 | p = strchr(name, '%'); |
1da177e4 LT |
1170 | if (p) { |
1171 | /* | |
1172 | * Verify the string as this thing may have come from | |
1173 | * the user. There must be either one "%d" and no other "%" | |
1174 | * characters. | |
1175 | */ | |
1176 | if (p[1] != 'd' || strchr(p + 2, '%')) | |
1177 | return -EINVAL; | |
1178 | ||
1179 | /* Use one page as a bit array of possible slots */ | |
cfcabdcc | 1180 | inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC); |
1da177e4 LT |
1181 | if (!inuse) |
1182 | return -ENOMEM; | |
1183 | ||
881d966b | 1184 | for_each_netdev(net, d) { |
1da177e4 LT |
1185 | if (!sscanf(d->name, name, &i)) |
1186 | continue; | |
1187 | if (i < 0 || i >= max_netdevices) | |
1188 | continue; | |
1189 | ||
1190 | /* avoid cases where sscanf is not exact inverse of printf */ | |
b267b179 | 1191 | snprintf(buf, IFNAMSIZ, name, i); |
1da177e4 LT |
1192 | if (!strncmp(buf, d->name, IFNAMSIZ)) |
1193 | set_bit(i, inuse); | |
1194 | } | |
1195 | ||
1196 | i = find_first_zero_bit(inuse, max_netdevices); | |
1197 | free_page((unsigned long) inuse); | |
1198 | } | |
1199 | ||
6224abda | 1200 | snprintf(buf, IFNAMSIZ, name, i); |
b267b179 | 1201 | if (!__dev_get_by_name(net, buf)) |
1da177e4 | 1202 | return i; |
1da177e4 LT |
1203 | |
1204 | /* It is possible to run out of possible slots | |
1205 | * when the name is long and there isn't enough space left | |
1206 | * for the digits, or if all bits are used. | |
1207 | */ | |
029b6d14 | 1208 | return -ENFILE; |
1da177e4 LT |
1209 | } |
1210 | ||
2c88b855 RV |
1211 | static int dev_alloc_name_ns(struct net *net, |
1212 | struct net_device *dev, | |
1213 | const char *name) | |
1214 | { | |
1215 | char buf[IFNAMSIZ]; | |
1216 | int ret; | |
1217 | ||
c46d7642 | 1218 | BUG_ON(!net); |
2c88b855 RV |
1219 | ret = __dev_alloc_name(net, name, buf); |
1220 | if (ret >= 0) | |
1221 | strlcpy(dev->name, buf, IFNAMSIZ); | |
1222 | return ret; | |
1da177e4 LT |
1223 | } |
1224 | ||
b267b179 EB |
1225 | /** |
1226 | * dev_alloc_name - allocate a name for a device | |
1227 | * @dev: device | |
1228 | * @name: name format string | |
1229 | * | |
1230 | * Passed a format string - eg "lt%d" it will try and find a suitable | |
1231 | * id. It scans list of devices to build up a free map, then chooses | |
1232 | * the first empty slot. The caller must hold the dev_base or rtnl lock | |
1233 | * while allocating the name and adding the device in order to avoid | |
1234 | * duplicates. | |
1235 | * Limited to bits_per_byte * page size devices (ie 32K on most platforms). | |
1236 | * Returns the number of the unit assigned or a negative errno code. | |
1237 | */ | |
1238 | ||
1239 | int dev_alloc_name(struct net_device *dev, const char *name) | |
1240 | { | |
c46d7642 | 1241 | return dev_alloc_name_ns(dev_net(dev), dev, name); |
b267b179 | 1242 | } |
d1b19dff | 1243 | EXPORT_SYMBOL(dev_alloc_name); |
b267b179 | 1244 | |
bacb7e18 ED |
1245 | static int dev_get_valid_name(struct net *net, struct net_device *dev, |
1246 | const char *name) | |
828de4f6 | 1247 | { |
55a5ec9b DM |
1248 | BUG_ON(!net); |
1249 | ||
1250 | if (!dev_valid_name(name)) | |
1251 | return -EINVAL; | |
1252 | ||
1253 | if (strchr(name, '%')) | |
1254 | return dev_alloc_name_ns(net, dev, name); | |
1255 | else if (__dev_get_by_name(net, name)) | |
1256 | return -EEXIST; | |
1257 | else if (dev->name != name) | |
1258 | strlcpy(dev->name, name, IFNAMSIZ); | |
1259 | ||
1260 | return 0; | |
d9031024 | 1261 | } |
1da177e4 LT |
1262 | |
1263 | /** | |
1264 | * dev_change_name - change name of a device | |
1265 | * @dev: device | |
1266 | * @newname: name (or format string) must be at least IFNAMSIZ | |
1267 | * | |
1268 | * Change name of a device, can pass format strings "eth%d". | |
1269 | * for wildcarding. | |
1270 | */ | |
cf04a4c7 | 1271 | int dev_change_name(struct net_device *dev, const char *newname) |
1da177e4 | 1272 | { |
238fa362 | 1273 | unsigned char old_assign_type; |
fcc5a03a | 1274 | char oldname[IFNAMSIZ]; |
1da177e4 | 1275 | int err = 0; |
fcc5a03a | 1276 | int ret; |
881d966b | 1277 | struct net *net; |
1da177e4 LT |
1278 | |
1279 | ASSERT_RTNL(); | |
c346dca1 | 1280 | BUG_ON(!dev_net(dev)); |
1da177e4 | 1281 | |
c346dca1 | 1282 | net = dev_net(dev); |
8065a779 SWL |
1283 | |
1284 | /* Some auto-enslaved devices e.g. failover slaves are | |
1285 | * special, as userspace might rename the device after | |
1286 | * the interface had been brought up and running since | |
1287 | * the point kernel initiated auto-enslavement. Allow | |
1288 | * live name change even when these slave devices are | |
1289 | * up and running. | |
1290 | * | |
1291 | * Typically, users of these auto-enslaving devices | |
1292 | * don't actually care about slave name change, as | |
1293 | * they are supposed to operate on master interface | |
1294 | * directly. | |
1295 | */ | |
1296 | if (dev->flags & IFF_UP && | |
1297 | likely(!(dev->priv_flags & IFF_LIVE_RENAME_OK))) | |
1da177e4 LT |
1298 | return -EBUSY; |
1299 | ||
11d6011c | 1300 | down_write(&devnet_rename_sem); |
c91f6df2 BH |
1301 | |
1302 | if (strncmp(newname, dev->name, IFNAMSIZ) == 0) { | |
11d6011c | 1303 | up_write(&devnet_rename_sem); |
c8d90dca | 1304 | return 0; |
c91f6df2 | 1305 | } |
c8d90dca | 1306 | |
fcc5a03a HX |
1307 | memcpy(oldname, dev->name, IFNAMSIZ); |
1308 | ||
828de4f6 | 1309 | err = dev_get_valid_name(net, dev, newname); |
c91f6df2 | 1310 | if (err < 0) { |
11d6011c | 1311 | up_write(&devnet_rename_sem); |
d9031024 | 1312 | return err; |
c91f6df2 | 1313 | } |
1da177e4 | 1314 | |
6fe82a39 VF |
1315 | if (oldname[0] && !strchr(oldname, '%')) |
1316 | netdev_info(dev, "renamed from %s\n", oldname); | |
1317 | ||
238fa362 TG |
1318 | old_assign_type = dev->name_assign_type; |
1319 | dev->name_assign_type = NET_NAME_RENAMED; | |
1320 | ||
fcc5a03a | 1321 | rollback: |
a1b3f594 EB |
1322 | ret = device_rename(&dev->dev, dev->name); |
1323 | if (ret) { | |
1324 | memcpy(dev->name, oldname, IFNAMSIZ); | |
238fa362 | 1325 | dev->name_assign_type = old_assign_type; |
11d6011c | 1326 | up_write(&devnet_rename_sem); |
a1b3f594 | 1327 | return ret; |
dcc99773 | 1328 | } |
7f988eab | 1329 | |
11d6011c | 1330 | up_write(&devnet_rename_sem); |
c91f6df2 | 1331 | |
5bb025fa VF |
1332 | netdev_adjacent_rename_links(dev, oldname); |
1333 | ||
7f988eab | 1334 | write_lock_bh(&dev_base_lock); |
ff927412 | 1335 | netdev_name_node_del(dev->name_node); |
72c9528b ED |
1336 | write_unlock_bh(&dev_base_lock); |
1337 | ||
1338 | synchronize_rcu(); | |
1339 | ||
1340 | write_lock_bh(&dev_base_lock); | |
ff927412 | 1341 | netdev_name_node_add(net, dev->name_node); |
7f988eab HX |
1342 | write_unlock_bh(&dev_base_lock); |
1343 | ||
056925ab | 1344 | ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev); |
fcc5a03a HX |
1345 | ret = notifier_to_errno(ret); |
1346 | ||
1347 | if (ret) { | |
91e9c07b ED |
1348 | /* err >= 0 after dev_alloc_name() or stores the first errno */ |
1349 | if (err >= 0) { | |
fcc5a03a | 1350 | err = ret; |
11d6011c | 1351 | down_write(&devnet_rename_sem); |
fcc5a03a | 1352 | memcpy(dev->name, oldname, IFNAMSIZ); |
5bb025fa | 1353 | memcpy(oldname, newname, IFNAMSIZ); |
238fa362 TG |
1354 | dev->name_assign_type = old_assign_type; |
1355 | old_assign_type = NET_NAME_RENAMED; | |
fcc5a03a | 1356 | goto rollback; |
91e9c07b | 1357 | } else { |
7b6cd1ce | 1358 | pr_err("%s: name change rollback failed: %d\n", |
91e9c07b | 1359 | dev->name, ret); |
fcc5a03a HX |
1360 | } |
1361 | } | |
1da177e4 LT |
1362 | |
1363 | return err; | |
1364 | } | |
1365 | ||
0b815a1a SH |
1366 | /** |
1367 | * dev_set_alias - change ifalias of a device | |
1368 | * @dev: device | |
1369 | * @alias: name up to IFALIASZ | |
f0db275a | 1370 | * @len: limit of bytes to copy from info |
0b815a1a SH |
1371 | * |
1372 | * Set ifalias for a device, | |
1373 | */ | |
1374 | int dev_set_alias(struct net_device *dev, const char *alias, size_t len) | |
1375 | { | |
6c557001 | 1376 | struct dev_ifalias *new_alias = NULL; |
0b815a1a SH |
1377 | |
1378 | if (len >= IFALIASZ) | |
1379 | return -EINVAL; | |
1380 | ||
6c557001 FW |
1381 | if (len) { |
1382 | new_alias = kmalloc(sizeof(*new_alias) + len + 1, GFP_KERNEL); | |
1383 | if (!new_alias) | |
1384 | return -ENOMEM; | |
1385 | ||
1386 | memcpy(new_alias->ifalias, alias, len); | |
1387 | new_alias->ifalias[len] = 0; | |
96ca4a2c OH |
1388 | } |
1389 | ||
6c557001 | 1390 | mutex_lock(&ifalias_mutex); |
e3f0d761 PM |
1391 | new_alias = rcu_replace_pointer(dev->ifalias, new_alias, |
1392 | mutex_is_locked(&ifalias_mutex)); | |
6c557001 FW |
1393 | mutex_unlock(&ifalias_mutex); |
1394 | ||
1395 | if (new_alias) | |
1396 | kfree_rcu(new_alias, rcuhead); | |
0b815a1a | 1397 | |
0b815a1a SH |
1398 | return len; |
1399 | } | |
0fe554a4 | 1400 | EXPORT_SYMBOL(dev_set_alias); |
0b815a1a | 1401 | |
6c557001 FW |
1402 | /** |
1403 | * dev_get_alias - get ifalias of a device | |
1404 | * @dev: device | |
20e88320 | 1405 | * @name: buffer to store name of ifalias |
6c557001 FW |
1406 | * @len: size of buffer |
1407 | * | |
1408 | * get ifalias for a device. Caller must make sure dev cannot go | |
1409 | * away, e.g. rcu read lock or own a reference count to device. | |
1410 | */ | |
1411 | int dev_get_alias(const struct net_device *dev, char *name, size_t len) | |
1412 | { | |
1413 | const struct dev_ifalias *alias; | |
1414 | int ret = 0; | |
1415 | ||
1416 | rcu_read_lock(); | |
1417 | alias = rcu_dereference(dev->ifalias); | |
1418 | if (alias) | |
1419 | ret = snprintf(name, len, "%s", alias->ifalias); | |
1420 | rcu_read_unlock(); | |
1421 | ||
1422 | return ret; | |
1423 | } | |
0b815a1a | 1424 | |
d8a33ac4 | 1425 | /** |
3041a069 | 1426 | * netdev_features_change - device changes features |
d8a33ac4 SH |
1427 | * @dev: device to cause notification |
1428 | * | |
1429 | * Called to indicate a device has changed features. | |
1430 | */ | |
1431 | void netdev_features_change(struct net_device *dev) | |
1432 | { | |
056925ab | 1433 | call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev); |
d8a33ac4 SH |
1434 | } |
1435 | EXPORT_SYMBOL(netdev_features_change); | |
1436 | ||
1da177e4 LT |
1437 | /** |
1438 | * netdev_state_change - device changes state | |
1439 | * @dev: device to cause notification | |
1440 | * | |
1441 | * Called to indicate a device has changed state. This function calls | |
1442 | * the notifier chains for netdev_chain and sends a NEWLINK message | |
1443 | * to the routing socket. | |
1444 | */ | |
1445 | void netdev_state_change(struct net_device *dev) | |
1446 | { | |
1447 | if (dev->flags & IFF_UP) { | |
51d0c047 DA |
1448 | struct netdev_notifier_change_info change_info = { |
1449 | .info.dev = dev, | |
1450 | }; | |
54951194 | 1451 | |
51d0c047 | 1452 | call_netdevice_notifiers_info(NETDEV_CHANGE, |
54951194 | 1453 | &change_info.info); |
7f294054 | 1454 | rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL); |
1da177e4 LT |
1455 | } |
1456 | } | |
d1b19dff | 1457 | EXPORT_SYMBOL(netdev_state_change); |
1da177e4 | 1458 | |
ee89bab1 | 1459 | /** |
722c9a0c | 1460 | * netdev_notify_peers - notify network peers about existence of @dev |
1461 | * @dev: network device | |
ee89bab1 AW |
1462 | * |
1463 | * Generate traffic such that interested network peers are aware of | |
1464 | * @dev, such as by generating a gratuitous ARP. This may be used when | |
1465 | * a device wants to inform the rest of the network about some sort of | |
1466 | * reconfiguration such as a failover event or virtual machine | |
1467 | * migration. | |
1468 | */ | |
1469 | void netdev_notify_peers(struct net_device *dev) | |
c1da4ac7 | 1470 | { |
ee89bab1 AW |
1471 | rtnl_lock(); |
1472 | call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, dev); | |
37c343b4 | 1473 | call_netdevice_notifiers(NETDEV_RESEND_IGMP, dev); |
ee89bab1 | 1474 | rtnl_unlock(); |
c1da4ac7 | 1475 | } |
ee89bab1 | 1476 | EXPORT_SYMBOL(netdev_notify_peers); |
c1da4ac7 | 1477 | |
40c900aa | 1478 | static int __dev_open(struct net_device *dev, struct netlink_ext_ack *extack) |
1da177e4 | 1479 | { |
d314774c | 1480 | const struct net_device_ops *ops = dev->netdev_ops; |
3b8bcfd5 | 1481 | int ret; |
1da177e4 | 1482 | |
e46b66bc BH |
1483 | ASSERT_RTNL(); |
1484 | ||
bd869245 HK |
1485 | if (!netif_device_present(dev)) { |
1486 | /* may be detached because parent is runtime-suspended */ | |
1487 | if (dev->dev.parent) | |
1488 | pm_runtime_resume(dev->dev.parent); | |
1489 | if (!netif_device_present(dev)) | |
1490 | return -ENODEV; | |
1491 | } | |
1da177e4 | 1492 | |
ca99ca14 NH |
1493 | /* Block netpoll from trying to do any rx path servicing. |
1494 | * If we don't do this there is a chance ndo_poll_controller | |
1495 | * or ndo_poll may be running while we open the device | |
1496 | */ | |
66b5552f | 1497 | netpoll_poll_disable(dev); |
ca99ca14 | 1498 | |
40c900aa | 1499 | ret = call_netdevice_notifiers_extack(NETDEV_PRE_UP, dev, extack); |
3b8bcfd5 JB |
1500 | ret = notifier_to_errno(ret); |
1501 | if (ret) | |
1502 | return ret; | |
1503 | ||
1da177e4 | 1504 | set_bit(__LINK_STATE_START, &dev->state); |
bada339b | 1505 | |
d314774c SH |
1506 | if (ops->ndo_validate_addr) |
1507 | ret = ops->ndo_validate_addr(dev); | |
bada339b | 1508 | |
d314774c SH |
1509 | if (!ret && ops->ndo_open) |
1510 | ret = ops->ndo_open(dev); | |
1da177e4 | 1511 | |
66b5552f | 1512 | netpoll_poll_enable(dev); |
ca99ca14 | 1513 | |
bada339b JG |
1514 | if (ret) |
1515 | clear_bit(__LINK_STATE_START, &dev->state); | |
1516 | else { | |
1da177e4 | 1517 | dev->flags |= IFF_UP; |
4417da66 | 1518 | dev_set_rx_mode(dev); |
1da177e4 | 1519 | dev_activate(dev); |
7bf23575 | 1520 | add_device_randomness(dev->dev_addr, dev->addr_len); |
1da177e4 | 1521 | } |
bada339b | 1522 | |
1da177e4 LT |
1523 | return ret; |
1524 | } | |
1525 | ||
1526 | /** | |
bd380811 | 1527 | * dev_open - prepare an interface for use. |
00f54e68 PM |
1528 | * @dev: device to open |
1529 | * @extack: netlink extended ack | |
1da177e4 | 1530 | * |
bd380811 PM |
1531 | * Takes a device from down to up state. The device's private open |
1532 | * function is invoked and then the multicast lists are loaded. Finally | |
1533 | * the device is moved into the up state and a %NETDEV_UP message is | |
1534 | * sent to the netdev notifier chain. | |
1535 | * | |
1536 | * Calling this function on an active interface is a nop. On a failure | |
1537 | * a negative errno code is returned. | |
1da177e4 | 1538 | */ |
00f54e68 | 1539 | int dev_open(struct net_device *dev, struct netlink_ext_ack *extack) |
bd380811 PM |
1540 | { |
1541 | int ret; | |
1542 | ||
bd380811 PM |
1543 | if (dev->flags & IFF_UP) |
1544 | return 0; | |
1545 | ||
40c900aa | 1546 | ret = __dev_open(dev, extack); |
bd380811 PM |
1547 | if (ret < 0) |
1548 | return ret; | |
1549 | ||
7f294054 | 1550 | rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING, GFP_KERNEL); |
bd380811 PM |
1551 | call_netdevice_notifiers(NETDEV_UP, dev); |
1552 | ||
1553 | return ret; | |
1554 | } | |
1555 | EXPORT_SYMBOL(dev_open); | |
1556 | ||
7051b88a | 1557 | static void __dev_close_many(struct list_head *head) |
1da177e4 | 1558 | { |
44345724 | 1559 | struct net_device *dev; |
e46b66bc | 1560 | |
bd380811 | 1561 | ASSERT_RTNL(); |
9d5010db DM |
1562 | might_sleep(); |
1563 | ||
5cde2829 | 1564 | list_for_each_entry(dev, head, close_list) { |
3f4df206 | 1565 | /* Temporarily disable netpoll until the interface is down */ |
66b5552f | 1566 | netpoll_poll_disable(dev); |
3f4df206 | 1567 | |
44345724 | 1568 | call_netdevice_notifiers(NETDEV_GOING_DOWN, dev); |
1da177e4 | 1569 | |
44345724 | 1570 | clear_bit(__LINK_STATE_START, &dev->state); |
1da177e4 | 1571 | |
44345724 OP |
1572 | /* Synchronize to scheduled poll. We cannot touch poll list, it |
1573 | * can be even on different cpu. So just clear netif_running(). | |
1574 | * | |
1575 | * dev->stop() will invoke napi_disable() on all of it's | |
1576 | * napi_struct instances on this device. | |
1577 | */ | |
4e857c58 | 1578 | smp_mb__after_atomic(); /* Commit netif_running(). */ |
44345724 | 1579 | } |
1da177e4 | 1580 | |
44345724 | 1581 | dev_deactivate_many(head); |
d8b2a4d2 | 1582 | |
5cde2829 | 1583 | list_for_each_entry(dev, head, close_list) { |
44345724 | 1584 | const struct net_device_ops *ops = dev->netdev_ops; |
1da177e4 | 1585 | |
44345724 OP |
1586 | /* |
1587 | * Call the device specific close. This cannot fail. | |
1588 | * Only if device is UP | |
1589 | * | |
1590 | * We allow it to be called even after a DETACH hot-plug | |
1591 | * event. | |
1592 | */ | |
1593 | if (ops->ndo_stop) | |
1594 | ops->ndo_stop(dev); | |
1595 | ||
44345724 | 1596 | dev->flags &= ~IFF_UP; |
66b5552f | 1597 | netpoll_poll_enable(dev); |
44345724 | 1598 | } |
44345724 OP |
1599 | } |
1600 | ||
7051b88a | 1601 | static void __dev_close(struct net_device *dev) |
44345724 OP |
1602 | { |
1603 | LIST_HEAD(single); | |
1604 | ||
5cde2829 | 1605 | list_add(&dev->close_list, &single); |
7051b88a | 1606 | __dev_close_many(&single); |
f87e6f47 | 1607 | list_del(&single); |
44345724 OP |
1608 | } |
1609 | ||
7051b88a | 1610 | void dev_close_many(struct list_head *head, bool unlink) |
44345724 OP |
1611 | { |
1612 | struct net_device *dev, *tmp; | |
1da177e4 | 1613 | |
5cde2829 EB |
1614 | /* Remove the devices that don't need to be closed */ |
1615 | list_for_each_entry_safe(dev, tmp, head, close_list) | |
44345724 | 1616 | if (!(dev->flags & IFF_UP)) |
5cde2829 | 1617 | list_del_init(&dev->close_list); |
44345724 OP |
1618 | |
1619 | __dev_close_many(head); | |
1da177e4 | 1620 | |
5cde2829 | 1621 | list_for_each_entry_safe(dev, tmp, head, close_list) { |
7f294054 | 1622 | rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING, GFP_KERNEL); |
44345724 | 1623 | call_netdevice_notifiers(NETDEV_DOWN, dev); |
99c4a26a DM |
1624 | if (unlink) |
1625 | list_del_init(&dev->close_list); | |
44345724 | 1626 | } |
bd380811 | 1627 | } |
99c4a26a | 1628 | EXPORT_SYMBOL(dev_close_many); |
bd380811 PM |
1629 | |
1630 | /** | |
1631 | * dev_close - shutdown an interface. | |
1632 | * @dev: device to shutdown | |
1633 | * | |
1634 | * This function moves an active device into down state. A | |
1635 | * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device | |
1636 | * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier | |
1637 | * chain. | |
1638 | */ | |
7051b88a | 1639 | void dev_close(struct net_device *dev) |
bd380811 | 1640 | { |
e14a5993 ED |
1641 | if (dev->flags & IFF_UP) { |
1642 | LIST_HEAD(single); | |
1da177e4 | 1643 | |
5cde2829 | 1644 | list_add(&dev->close_list, &single); |
99c4a26a | 1645 | dev_close_many(&single, true); |
e14a5993 ED |
1646 | list_del(&single); |
1647 | } | |
1da177e4 | 1648 | } |
d1b19dff | 1649 | EXPORT_SYMBOL(dev_close); |
1da177e4 LT |
1650 | |
1651 | ||
0187bdfb BH |
1652 | /** |
1653 | * dev_disable_lro - disable Large Receive Offload on a device | |
1654 | * @dev: device | |
1655 | * | |
1656 | * Disable Large Receive Offload (LRO) on a net device. Must be | |
1657 | * called under RTNL. This is needed if received packets may be | |
1658 | * forwarded to another interface. | |
1659 | */ | |
1660 | void dev_disable_lro(struct net_device *dev) | |
1661 | { | |
fbe168ba MK |
1662 | struct net_device *lower_dev; |
1663 | struct list_head *iter; | |
529d0489 | 1664 | |
bc5787c6 MM |
1665 | dev->wanted_features &= ~NETIF_F_LRO; |
1666 | netdev_update_features(dev); | |
27660515 | 1667 | |
22d5969f MM |
1668 | if (unlikely(dev->features & NETIF_F_LRO)) |
1669 | netdev_WARN(dev, "failed to disable LRO!\n"); | |
fbe168ba MK |
1670 | |
1671 | netdev_for_each_lower_dev(dev, lower_dev, iter) | |
1672 | dev_disable_lro(lower_dev); | |
0187bdfb BH |
1673 | } |
1674 | EXPORT_SYMBOL(dev_disable_lro); | |
1675 | ||
56f5aa77 MC |
1676 | /** |
1677 | * dev_disable_gro_hw - disable HW Generic Receive Offload on a device | |
1678 | * @dev: device | |
1679 | * | |
1680 | * Disable HW Generic Receive Offload (GRO_HW) on a net device. Must be | |
1681 | * called under RTNL. This is needed if Generic XDP is installed on | |
1682 | * the device. | |
1683 | */ | |
1684 | static void dev_disable_gro_hw(struct net_device *dev) | |
1685 | { | |
1686 | dev->wanted_features &= ~NETIF_F_GRO_HW; | |
1687 | netdev_update_features(dev); | |
1688 | ||
1689 | if (unlikely(dev->features & NETIF_F_GRO_HW)) | |
1690 | netdev_WARN(dev, "failed to disable GRO_HW!\n"); | |
1691 | } | |
1692 | ||
ede2762d KT |
1693 | const char *netdev_cmd_to_name(enum netdev_cmd cmd) |
1694 | { | |
1695 | #define N(val) \ | |
1696 | case NETDEV_##val: \ | |
1697 | return "NETDEV_" __stringify(val); | |
1698 | switch (cmd) { | |
1699 | N(UP) N(DOWN) N(REBOOT) N(CHANGE) N(REGISTER) N(UNREGISTER) | |
1700 | N(CHANGEMTU) N(CHANGEADDR) N(GOING_DOWN) N(CHANGENAME) N(FEAT_CHANGE) | |
1701 | N(BONDING_FAILOVER) N(PRE_UP) N(PRE_TYPE_CHANGE) N(POST_TYPE_CHANGE) | |
1702 | N(POST_INIT) N(RELEASE) N(NOTIFY_PEERS) N(JOIN) N(CHANGEUPPER) | |
1703 | N(RESEND_IGMP) N(PRECHANGEMTU) N(CHANGEINFODATA) N(BONDING_INFO) | |
1704 | N(PRECHANGEUPPER) N(CHANGELOWERSTATE) N(UDP_TUNNEL_PUSH_INFO) | |
1705 | N(UDP_TUNNEL_DROP_INFO) N(CHANGE_TX_QUEUE_LEN) | |
9daae9bd GP |
1706 | N(CVLAN_FILTER_PUSH_INFO) N(CVLAN_FILTER_DROP_INFO) |
1707 | N(SVLAN_FILTER_PUSH_INFO) N(SVLAN_FILTER_DROP_INFO) | |
1570415f | 1708 | N(PRE_CHANGEADDR) |
3f5ecd8a | 1709 | } |
ede2762d KT |
1710 | #undef N |
1711 | return "UNKNOWN_NETDEV_EVENT"; | |
1712 | } | |
1713 | EXPORT_SYMBOL_GPL(netdev_cmd_to_name); | |
1714 | ||
351638e7 JP |
1715 | static int call_netdevice_notifier(struct notifier_block *nb, unsigned long val, |
1716 | struct net_device *dev) | |
1717 | { | |
51d0c047 DA |
1718 | struct netdev_notifier_info info = { |
1719 | .dev = dev, | |
1720 | }; | |
351638e7 | 1721 | |
351638e7 JP |
1722 | return nb->notifier_call(nb, val, &info); |
1723 | } | |
0187bdfb | 1724 | |
afa0df59 JP |
1725 | static int call_netdevice_register_notifiers(struct notifier_block *nb, |
1726 | struct net_device *dev) | |
1727 | { | |
1728 | int err; | |
1729 | ||
1730 | err = call_netdevice_notifier(nb, NETDEV_REGISTER, dev); | |
1731 | err = notifier_to_errno(err); | |
1732 | if (err) | |
1733 | return err; | |
1734 | ||
1735 | if (!(dev->flags & IFF_UP)) | |
1736 | return 0; | |
1737 | ||
1738 | call_netdevice_notifier(nb, NETDEV_UP, dev); | |
1739 | return 0; | |
1740 | } | |
1741 | ||
1742 | static void call_netdevice_unregister_notifiers(struct notifier_block *nb, | |
1743 | struct net_device *dev) | |
1744 | { | |
1745 | if (dev->flags & IFF_UP) { | |
1746 | call_netdevice_notifier(nb, NETDEV_GOING_DOWN, | |
1747 | dev); | |
1748 | call_netdevice_notifier(nb, NETDEV_DOWN, dev); | |
1749 | } | |
1750 | call_netdevice_notifier(nb, NETDEV_UNREGISTER, dev); | |
1751 | } | |
1752 | ||
1753 | static int call_netdevice_register_net_notifiers(struct notifier_block *nb, | |
1754 | struct net *net) | |
1755 | { | |
1756 | struct net_device *dev; | |
1757 | int err; | |
1758 | ||
1759 | for_each_netdev(net, dev) { | |
1760 | err = call_netdevice_register_notifiers(nb, dev); | |
1761 | if (err) | |
1762 | goto rollback; | |
1763 | } | |
1764 | return 0; | |
1765 | ||
1766 | rollback: | |
1767 | for_each_netdev_continue_reverse(net, dev) | |
1768 | call_netdevice_unregister_notifiers(nb, dev); | |
1769 | return err; | |
1770 | } | |
1771 | ||
1772 | static void call_netdevice_unregister_net_notifiers(struct notifier_block *nb, | |
1773 | struct net *net) | |
1774 | { | |
1775 | struct net_device *dev; | |
1776 | ||
1777 | for_each_netdev(net, dev) | |
1778 | call_netdevice_unregister_notifiers(nb, dev); | |
1779 | } | |
1780 | ||
881d966b EB |
1781 | static int dev_boot_phase = 1; |
1782 | ||
1da177e4 | 1783 | /** |
722c9a0c | 1784 | * register_netdevice_notifier - register a network notifier block |
1785 | * @nb: notifier | |
1da177e4 | 1786 | * |
722c9a0c | 1787 | * Register a notifier to be called when network device events occur. |
1788 | * The notifier passed is linked into the kernel structures and must | |
1789 | * not be reused until it has been unregistered. A negative errno code | |
1790 | * is returned on a failure. | |
1da177e4 | 1791 | * |
722c9a0c | 1792 | * When registered all registration and up events are replayed |
1793 | * to the new notifier to allow device to have a race free | |
1794 | * view of the network device list. | |
1da177e4 LT |
1795 | */ |
1796 | ||
1797 | int register_netdevice_notifier(struct notifier_block *nb) | |
1798 | { | |
881d966b | 1799 | struct net *net; |
1da177e4 LT |
1800 | int err; |
1801 | ||
328fbe74 KT |
1802 | /* Close race with setup_net() and cleanup_net() */ |
1803 | down_write(&pernet_ops_rwsem); | |
1da177e4 | 1804 | rtnl_lock(); |
f07d5b94 | 1805 | err = raw_notifier_chain_register(&netdev_chain, nb); |
fcc5a03a HX |
1806 | if (err) |
1807 | goto unlock; | |
881d966b EB |
1808 | if (dev_boot_phase) |
1809 | goto unlock; | |
1810 | for_each_net(net) { | |
afa0df59 JP |
1811 | err = call_netdevice_register_net_notifiers(nb, net); |
1812 | if (err) | |
1813 | goto rollback; | |
1da177e4 | 1814 | } |
fcc5a03a HX |
1815 | |
1816 | unlock: | |
1da177e4 | 1817 | rtnl_unlock(); |
328fbe74 | 1818 | up_write(&pernet_ops_rwsem); |
1da177e4 | 1819 | return err; |
fcc5a03a HX |
1820 | |
1821 | rollback: | |
afa0df59 JP |
1822 | for_each_net_continue_reverse(net) |
1823 | call_netdevice_unregister_net_notifiers(nb, net); | |
c67625a1 PE |
1824 | |
1825 | raw_notifier_chain_unregister(&netdev_chain, nb); | |
fcc5a03a | 1826 | goto unlock; |
1da177e4 | 1827 | } |
d1b19dff | 1828 | EXPORT_SYMBOL(register_netdevice_notifier); |
1da177e4 LT |
1829 | |
1830 | /** | |
722c9a0c | 1831 | * unregister_netdevice_notifier - unregister a network notifier block |
1832 | * @nb: notifier | |
1da177e4 | 1833 | * |
722c9a0c | 1834 | * Unregister a notifier previously registered by |
1835 | * register_netdevice_notifier(). The notifier is unlinked into the | |
1836 | * kernel structures and may then be reused. A negative errno code | |
1837 | * is returned on a failure. | |
7d3d43da | 1838 | * |
722c9a0c | 1839 | * After unregistering unregister and down device events are synthesized |
1840 | * for all devices on the device list to the removed notifier to remove | |
1841 | * the need for special case cleanup code. | |
1da177e4 LT |
1842 | */ |
1843 | ||
1844 | int unregister_netdevice_notifier(struct notifier_block *nb) | |
1845 | { | |
7d3d43da | 1846 | struct net *net; |
9f514950 HX |
1847 | int err; |
1848 | ||
328fbe74 KT |
1849 | /* Close race with setup_net() and cleanup_net() */ |
1850 | down_write(&pernet_ops_rwsem); | |
9f514950 | 1851 | rtnl_lock(); |
f07d5b94 | 1852 | err = raw_notifier_chain_unregister(&netdev_chain, nb); |
7d3d43da EB |
1853 | if (err) |
1854 | goto unlock; | |
1855 | ||
48b3a137 JP |
1856 | for_each_net(net) |
1857 | call_netdevice_unregister_net_notifiers(nb, net); | |
1858 | ||
7d3d43da | 1859 | unlock: |
9f514950 | 1860 | rtnl_unlock(); |
328fbe74 | 1861 | up_write(&pernet_ops_rwsem); |
9f514950 | 1862 | return err; |
1da177e4 | 1863 | } |
d1b19dff | 1864 | EXPORT_SYMBOL(unregister_netdevice_notifier); |
1da177e4 | 1865 | |
1f637703 JP |
1866 | static int __register_netdevice_notifier_net(struct net *net, |
1867 | struct notifier_block *nb, | |
1868 | bool ignore_call_fail) | |
1869 | { | |
1870 | int err; | |
1871 | ||
1872 | err = raw_notifier_chain_register(&net->netdev_chain, nb); | |
1873 | if (err) | |
1874 | return err; | |
1875 | if (dev_boot_phase) | |
1876 | return 0; | |
1877 | ||
1878 | err = call_netdevice_register_net_notifiers(nb, net); | |
1879 | if (err && !ignore_call_fail) | |
1880 | goto chain_unregister; | |
1881 | ||
1882 | return 0; | |
1883 | ||
1884 | chain_unregister: | |
1885 | raw_notifier_chain_unregister(&net->netdev_chain, nb); | |
1886 | return err; | |
1887 | } | |
1888 | ||
1889 | static int __unregister_netdevice_notifier_net(struct net *net, | |
1890 | struct notifier_block *nb) | |
1891 | { | |
1892 | int err; | |
1893 | ||
1894 | err = raw_notifier_chain_unregister(&net->netdev_chain, nb); | |
1895 | if (err) | |
1896 | return err; | |
1897 | ||
1898 | call_netdevice_unregister_net_notifiers(nb, net); | |
1899 | return 0; | |
1900 | } | |
1901 | ||
a30c7b42 JP |
1902 | /** |
1903 | * register_netdevice_notifier_net - register a per-netns network notifier block | |
1904 | * @net: network namespace | |
1905 | * @nb: notifier | |
1906 | * | |
1907 | * Register a notifier to be called when network device events occur. | |
1908 | * The notifier passed is linked into the kernel structures and must | |
1909 | * not be reused until it has been unregistered. A negative errno code | |
1910 | * is returned on a failure. | |
1911 | * | |
1912 | * When registered all registration and up events are replayed | |
1913 | * to the new notifier to allow device to have a race free | |
1914 | * view of the network device list. | |
1915 | */ | |
1916 | ||
1917 | int register_netdevice_notifier_net(struct net *net, struct notifier_block *nb) | |
1918 | { | |
1919 | int err; | |
1920 | ||
1921 | rtnl_lock(); | |
1f637703 | 1922 | err = __register_netdevice_notifier_net(net, nb, false); |
a30c7b42 JP |
1923 | rtnl_unlock(); |
1924 | return err; | |
a30c7b42 JP |
1925 | } |
1926 | EXPORT_SYMBOL(register_netdevice_notifier_net); | |
1927 | ||
1928 | /** | |
1929 | * unregister_netdevice_notifier_net - unregister a per-netns | |
1930 | * network notifier block | |
1931 | * @net: network namespace | |
1932 | * @nb: notifier | |
1933 | * | |
1934 | * Unregister a notifier previously registered by | |
1935 | * register_netdevice_notifier(). The notifier is unlinked into the | |
1936 | * kernel structures and may then be reused. A negative errno code | |
1937 | * is returned on a failure. | |
1938 | * | |
1939 | * After unregistering unregister and down device events are synthesized | |
1940 | * for all devices on the device list to the removed notifier to remove | |
1941 | * the need for special case cleanup code. | |
1942 | */ | |
1943 | ||
1944 | int unregister_netdevice_notifier_net(struct net *net, | |
1945 | struct notifier_block *nb) | |
1946 | { | |
1947 | int err; | |
1948 | ||
1949 | rtnl_lock(); | |
1f637703 | 1950 | err = __unregister_netdevice_notifier_net(net, nb); |
a30c7b42 JP |
1951 | rtnl_unlock(); |
1952 | return err; | |
1953 | } | |
1954 | EXPORT_SYMBOL(unregister_netdevice_notifier_net); | |
a30c7b42 | 1955 | |
93642e14 JP |
1956 | int register_netdevice_notifier_dev_net(struct net_device *dev, |
1957 | struct notifier_block *nb, | |
1958 | struct netdev_net_notifier *nn) | |
1959 | { | |
1960 | int err; | |
a30c7b42 | 1961 | |
93642e14 JP |
1962 | rtnl_lock(); |
1963 | err = __register_netdevice_notifier_net(dev_net(dev), nb, false); | |
1964 | if (!err) { | |
1965 | nn->nb = nb; | |
1966 | list_add(&nn->list, &dev->net_notifier_list); | |
1967 | } | |
a30c7b42 JP |
1968 | rtnl_unlock(); |
1969 | return err; | |
1970 | } | |
93642e14 JP |
1971 | EXPORT_SYMBOL(register_netdevice_notifier_dev_net); |
1972 | ||
1973 | int unregister_netdevice_notifier_dev_net(struct net_device *dev, | |
1974 | struct notifier_block *nb, | |
1975 | struct netdev_net_notifier *nn) | |
1976 | { | |
1977 | int err; | |
1978 | ||
1979 | rtnl_lock(); | |
1980 | list_del(&nn->list); | |
1981 | err = __unregister_netdevice_notifier_net(dev_net(dev), nb); | |
1982 | rtnl_unlock(); | |
1983 | return err; | |
1984 | } | |
1985 | EXPORT_SYMBOL(unregister_netdevice_notifier_dev_net); | |
1986 | ||
1987 | static void move_netdevice_notifiers_dev_net(struct net_device *dev, | |
1988 | struct net *net) | |
1989 | { | |
1990 | struct netdev_net_notifier *nn; | |
1991 | ||
1992 | list_for_each_entry(nn, &dev->net_notifier_list, list) { | |
1993 | __unregister_netdevice_notifier_net(dev_net(dev), nn->nb); | |
1994 | __register_netdevice_notifier_net(net, nn->nb, true); | |
1995 | } | |
1996 | } | |
a30c7b42 | 1997 | |
351638e7 JP |
1998 | /** |
1999 | * call_netdevice_notifiers_info - call all network notifier blocks | |
2000 | * @val: value passed unmodified to notifier function | |
351638e7 JP |
2001 | * @info: notifier information data |
2002 | * | |
2003 | * Call all network notifier blocks. Parameters and return value | |
2004 | * are as for raw_notifier_call_chain(). | |
2005 | */ | |
2006 | ||
1d143d9f | 2007 | static int call_netdevice_notifiers_info(unsigned long val, |
1d143d9f | 2008 | struct netdev_notifier_info *info) |
351638e7 | 2009 | { |
a30c7b42 JP |
2010 | struct net *net = dev_net(info->dev); |
2011 | int ret; | |
2012 | ||
351638e7 | 2013 | ASSERT_RTNL(); |
a30c7b42 JP |
2014 | |
2015 | /* Run per-netns notifier block chain first, then run the global one. | |
2016 | * Hopefully, one day, the global one is going to be removed after | |
2017 | * all notifier block registrators get converted to be per-netns. | |
2018 | */ | |
2019 | ret = raw_notifier_call_chain(&net->netdev_chain, val, info); | |
2020 | if (ret & NOTIFY_STOP_MASK) | |
2021 | return ret; | |
351638e7 JP |
2022 | return raw_notifier_call_chain(&netdev_chain, val, info); |
2023 | } | |
351638e7 | 2024 | |
26372605 PM |
2025 | static int call_netdevice_notifiers_extack(unsigned long val, |
2026 | struct net_device *dev, | |
2027 | struct netlink_ext_ack *extack) | |
2028 | { | |
2029 | struct netdev_notifier_info info = { | |
2030 | .dev = dev, | |
2031 | .extack = extack, | |
2032 | }; | |
2033 | ||
2034 | return call_netdevice_notifiers_info(val, &info); | |
2035 | } | |
2036 | ||
1da177e4 LT |
2037 | /** |
2038 | * call_netdevice_notifiers - call all network notifier blocks | |
2039 | * @val: value passed unmodified to notifier function | |
c4ea43c5 | 2040 | * @dev: net_device pointer passed unmodified to notifier function |
1da177e4 LT |
2041 | * |
2042 | * Call all network notifier blocks. Parameters and return value | |
f07d5b94 | 2043 | * are as for raw_notifier_call_chain(). |
1da177e4 LT |
2044 | */ |
2045 | ||
ad7379d4 | 2046 | int call_netdevice_notifiers(unsigned long val, struct net_device *dev) |
1da177e4 | 2047 | { |
26372605 | 2048 | return call_netdevice_notifiers_extack(val, dev, NULL); |
1da177e4 | 2049 | } |
edf947f1 | 2050 | EXPORT_SYMBOL(call_netdevice_notifiers); |
1da177e4 | 2051 | |
af7d6cce SD |
2052 | /** |
2053 | * call_netdevice_notifiers_mtu - call all network notifier blocks | |
2054 | * @val: value passed unmodified to notifier function | |
2055 | * @dev: net_device pointer passed unmodified to notifier function | |
2056 | * @arg: additional u32 argument passed to the notifier function | |
2057 | * | |
2058 | * Call all network notifier blocks. Parameters and return value | |
2059 | * are as for raw_notifier_call_chain(). | |
2060 | */ | |
2061 | static int call_netdevice_notifiers_mtu(unsigned long val, | |
2062 | struct net_device *dev, u32 arg) | |
2063 | { | |
2064 | struct netdev_notifier_info_ext info = { | |
2065 | .info.dev = dev, | |
2066 | .ext.mtu = arg, | |
2067 | }; | |
2068 | ||
2069 | BUILD_BUG_ON(offsetof(struct netdev_notifier_info_ext, info) != 0); | |
2070 | ||
2071 | return call_netdevice_notifiers_info(val, &info.info); | |
2072 | } | |
2073 | ||
1cf51900 | 2074 | #ifdef CONFIG_NET_INGRESS |
aabf6772 | 2075 | static DEFINE_STATIC_KEY_FALSE(ingress_needed_key); |
4577139b DB |
2076 | |
2077 | void net_inc_ingress_queue(void) | |
2078 | { | |
aabf6772 | 2079 | static_branch_inc(&ingress_needed_key); |
4577139b DB |
2080 | } |
2081 | EXPORT_SYMBOL_GPL(net_inc_ingress_queue); | |
2082 | ||
2083 | void net_dec_ingress_queue(void) | |
2084 | { | |
aabf6772 | 2085 | static_branch_dec(&ingress_needed_key); |
4577139b DB |
2086 | } |
2087 | EXPORT_SYMBOL_GPL(net_dec_ingress_queue); | |
2088 | #endif | |
2089 | ||
1f211a1b | 2090 | #ifdef CONFIG_NET_EGRESS |
aabf6772 | 2091 | static DEFINE_STATIC_KEY_FALSE(egress_needed_key); |
1f211a1b DB |
2092 | |
2093 | void net_inc_egress_queue(void) | |
2094 | { | |
aabf6772 | 2095 | static_branch_inc(&egress_needed_key); |
1f211a1b DB |
2096 | } |
2097 | EXPORT_SYMBOL_GPL(net_inc_egress_queue); | |
2098 | ||
2099 | void net_dec_egress_queue(void) | |
2100 | { | |
aabf6772 | 2101 | static_branch_dec(&egress_needed_key); |
1f211a1b DB |
2102 | } |
2103 | EXPORT_SYMBOL_GPL(net_dec_egress_queue); | |
2104 | #endif | |
2105 | ||
39e83922 | 2106 | static DEFINE_STATIC_KEY_FALSE(netstamp_needed_key); |
e9666d10 | 2107 | #ifdef CONFIG_JUMP_LABEL |
b90e5794 | 2108 | static atomic_t netstamp_needed_deferred; |
13baa00a | 2109 | static atomic_t netstamp_wanted; |
5fa8bbda | 2110 | static void netstamp_clear(struct work_struct *work) |
1da177e4 | 2111 | { |
b90e5794 | 2112 | int deferred = atomic_xchg(&netstamp_needed_deferred, 0); |
13baa00a | 2113 | int wanted; |
b90e5794 | 2114 | |
13baa00a ED |
2115 | wanted = atomic_add_return(deferred, &netstamp_wanted); |
2116 | if (wanted > 0) | |
39e83922 | 2117 | static_branch_enable(&netstamp_needed_key); |
13baa00a | 2118 | else |
39e83922 | 2119 | static_branch_disable(&netstamp_needed_key); |
5fa8bbda ED |
2120 | } |
2121 | static DECLARE_WORK(netstamp_work, netstamp_clear); | |
b90e5794 | 2122 | #endif |
5fa8bbda ED |
2123 | |
2124 | void net_enable_timestamp(void) | |
2125 | { | |
e9666d10 | 2126 | #ifdef CONFIG_JUMP_LABEL |
13baa00a ED |
2127 | int wanted; |
2128 | ||
2129 | while (1) { | |
2130 | wanted = atomic_read(&netstamp_wanted); | |
2131 | if (wanted <= 0) | |
2132 | break; | |
2133 | if (atomic_cmpxchg(&netstamp_wanted, wanted, wanted + 1) == wanted) | |
2134 | return; | |
2135 | } | |
2136 | atomic_inc(&netstamp_needed_deferred); | |
2137 | schedule_work(&netstamp_work); | |
2138 | #else | |
39e83922 | 2139 | static_branch_inc(&netstamp_needed_key); |
13baa00a | 2140 | #endif |
1da177e4 | 2141 | } |
d1b19dff | 2142 | EXPORT_SYMBOL(net_enable_timestamp); |
1da177e4 LT |
2143 | |
2144 | void net_disable_timestamp(void) | |
2145 | { | |
e9666d10 | 2146 | #ifdef CONFIG_JUMP_LABEL |
13baa00a ED |
2147 | int wanted; |
2148 | ||
2149 | while (1) { | |
2150 | wanted = atomic_read(&netstamp_wanted); | |
2151 | if (wanted <= 1) | |
2152 | break; | |
2153 | if (atomic_cmpxchg(&netstamp_wanted, wanted, wanted - 1) == wanted) | |
2154 | return; | |
2155 | } | |
2156 | atomic_dec(&netstamp_needed_deferred); | |
5fa8bbda ED |
2157 | schedule_work(&netstamp_work); |
2158 | #else | |
39e83922 | 2159 | static_branch_dec(&netstamp_needed_key); |
5fa8bbda | 2160 | #endif |
1da177e4 | 2161 | } |
d1b19dff | 2162 | EXPORT_SYMBOL(net_disable_timestamp); |
1da177e4 | 2163 | |
3b098e2d | 2164 | static inline void net_timestamp_set(struct sk_buff *skb) |
1da177e4 | 2165 | { |
2456e855 | 2166 | skb->tstamp = 0; |
39e83922 | 2167 | if (static_branch_unlikely(&netstamp_needed_key)) |
a61bbcf2 | 2168 | __net_timestamp(skb); |
1da177e4 LT |
2169 | } |
2170 | ||
39e83922 DB |
2171 | #define net_timestamp_check(COND, SKB) \ |
2172 | if (static_branch_unlikely(&netstamp_needed_key)) { \ | |
2173 | if ((COND) && !(SKB)->tstamp) \ | |
2174 | __net_timestamp(SKB); \ | |
2175 | } \ | |
3b098e2d | 2176 | |
f4b05d27 | 2177 | bool is_skb_forwardable(const struct net_device *dev, const struct sk_buff *skb) |
79b569f0 DL |
2178 | { |
2179 | unsigned int len; | |
2180 | ||
2181 | if (!(dev->flags & IFF_UP)) | |
2182 | return false; | |
2183 | ||
2184 | len = dev->mtu + dev->hard_header_len + VLAN_HLEN; | |
2185 | if (skb->len <= len) | |
2186 | return true; | |
2187 | ||
2188 | /* if TSO is enabled, we don't care about the length as the packet | |
2189 | * could be forwarded without being segmented before | |
2190 | */ | |
2191 | if (skb_is_gso(skb)) | |
2192 | return true; | |
2193 | ||
2194 | return false; | |
2195 | } | |
1ee481fb | 2196 | EXPORT_SYMBOL_GPL(is_skb_forwardable); |
79b569f0 | 2197 | |
a0265d28 HX |
2198 | int __dev_forward_skb(struct net_device *dev, struct sk_buff *skb) |
2199 | { | |
4e3264d2 | 2200 | int ret = ____dev_forward_skb(dev, skb); |
a0265d28 | 2201 | |
4e3264d2 MKL |
2202 | if (likely(!ret)) { |
2203 | skb->protocol = eth_type_trans(skb, dev); | |
2204 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); | |
2205 | } | |
a0265d28 | 2206 | |
4e3264d2 | 2207 | return ret; |
a0265d28 HX |
2208 | } |
2209 | EXPORT_SYMBOL_GPL(__dev_forward_skb); | |
2210 | ||
44540960 AB |
2211 | /** |
2212 | * dev_forward_skb - loopback an skb to another netif | |
2213 | * | |
2214 | * @dev: destination network device | |
2215 | * @skb: buffer to forward | |
2216 | * | |
2217 | * return values: | |
2218 | * NET_RX_SUCCESS (no congestion) | |
6ec82562 | 2219 | * NET_RX_DROP (packet was dropped, but freed) |
44540960 AB |
2220 | * |
2221 | * dev_forward_skb can be used for injecting an skb from the | |
2222 | * start_xmit function of one device into the receive queue | |
2223 | * of another device. | |
2224 | * | |
2225 | * The receiving device may be in another namespace, so | |
2226 | * we have to clear all information in the skb that could | |
2227 | * impact namespace isolation. | |
2228 | */ | |
2229 | int dev_forward_skb(struct net_device *dev, struct sk_buff *skb) | |
2230 | { | |
a0265d28 | 2231 | return __dev_forward_skb(dev, skb) ?: netif_rx_internal(skb); |
44540960 AB |
2232 | } |
2233 | EXPORT_SYMBOL_GPL(dev_forward_skb); | |
2234 | ||
71d9dec2 CG |
2235 | static inline int deliver_skb(struct sk_buff *skb, |
2236 | struct packet_type *pt_prev, | |
2237 | struct net_device *orig_dev) | |
2238 | { | |
1f8b977a | 2239 | if (unlikely(skb_orphan_frags_rx(skb, GFP_ATOMIC))) |
1080e512 | 2240 | return -ENOMEM; |
63354797 | 2241 | refcount_inc(&skb->users); |
71d9dec2 CG |
2242 | return pt_prev->func(skb, skb->dev, pt_prev, orig_dev); |
2243 | } | |
2244 | ||
7866a621 SN |
2245 | static inline void deliver_ptype_list_skb(struct sk_buff *skb, |
2246 | struct packet_type **pt, | |
fbcb2170 JP |
2247 | struct net_device *orig_dev, |
2248 | __be16 type, | |
7866a621 SN |
2249 | struct list_head *ptype_list) |
2250 | { | |
2251 | struct packet_type *ptype, *pt_prev = *pt; | |
2252 | ||
2253 | list_for_each_entry_rcu(ptype, ptype_list, list) { | |
2254 | if (ptype->type != type) | |
2255 | continue; | |
2256 | if (pt_prev) | |
fbcb2170 | 2257 | deliver_skb(skb, pt_prev, orig_dev); |
7866a621 SN |
2258 | pt_prev = ptype; |
2259 | } | |
2260 | *pt = pt_prev; | |
2261 | } | |
2262 | ||
c0de08d0 EL |
2263 | static inline bool skb_loop_sk(struct packet_type *ptype, struct sk_buff *skb) |
2264 | { | |
a3d744e9 | 2265 | if (!ptype->af_packet_priv || !skb->sk) |
c0de08d0 EL |
2266 | return false; |
2267 | ||
2268 | if (ptype->id_match) | |
2269 | return ptype->id_match(ptype, skb->sk); | |
2270 | else if ((struct sock *)ptype->af_packet_priv == skb->sk) | |
2271 | return true; | |
2272 | ||
2273 | return false; | |
2274 | } | |
2275 | ||
9f9a742d MR |
2276 | /** |
2277 | * dev_nit_active - return true if any network interface taps are in use | |
2278 | * | |
2279 | * @dev: network device to check for the presence of taps | |
2280 | */ | |
2281 | bool dev_nit_active(struct net_device *dev) | |
2282 | { | |
2283 | return !list_empty(&ptype_all) || !list_empty(&dev->ptype_all); | |
2284 | } | |
2285 | EXPORT_SYMBOL_GPL(dev_nit_active); | |
2286 | ||
1da177e4 LT |
2287 | /* |
2288 | * Support routine. Sends outgoing frames to any network | |
2289 | * taps currently in use. | |
2290 | */ | |
2291 | ||
74b20582 | 2292 | void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
2293 | { |
2294 | struct packet_type *ptype; | |
71d9dec2 CG |
2295 | struct sk_buff *skb2 = NULL; |
2296 | struct packet_type *pt_prev = NULL; | |
7866a621 | 2297 | struct list_head *ptype_list = &ptype_all; |
a61bbcf2 | 2298 | |
1da177e4 | 2299 | rcu_read_lock(); |
7866a621 SN |
2300 | again: |
2301 | list_for_each_entry_rcu(ptype, ptype_list, list) { | |
fa788d98 VW |
2302 | if (ptype->ignore_outgoing) |
2303 | continue; | |
2304 | ||
1da177e4 LT |
2305 | /* Never send packets back to the socket |
2306 | * they originated from - MvS (miquels@drinkel.ow.org) | |
2307 | */ | |
7866a621 SN |
2308 | if (skb_loop_sk(ptype, skb)) |
2309 | continue; | |
71d9dec2 | 2310 | |
7866a621 SN |
2311 | if (pt_prev) { |
2312 | deliver_skb(skb2, pt_prev, skb->dev); | |
2313 | pt_prev = ptype; | |
2314 | continue; | |
2315 | } | |
1da177e4 | 2316 | |
7866a621 SN |
2317 | /* need to clone skb, done only once */ |
2318 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
2319 | if (!skb2) | |
2320 | goto out_unlock; | |
70978182 | 2321 | |
7866a621 | 2322 | net_timestamp_set(skb2); |
1da177e4 | 2323 | |
7866a621 SN |
2324 | /* skb->nh should be correctly |
2325 | * set by sender, so that the second statement is | |
2326 | * just protection against buggy protocols. | |
2327 | */ | |
2328 | skb_reset_mac_header(skb2); | |
2329 | ||
2330 | if (skb_network_header(skb2) < skb2->data || | |
2331 | skb_network_header(skb2) > skb_tail_pointer(skb2)) { | |
2332 | net_crit_ratelimited("protocol %04x is buggy, dev %s\n", | |
2333 | ntohs(skb2->protocol), | |
2334 | dev->name); | |
2335 | skb_reset_network_header(skb2); | |
1da177e4 | 2336 | } |
7866a621 SN |
2337 | |
2338 | skb2->transport_header = skb2->network_header; | |
2339 | skb2->pkt_type = PACKET_OUTGOING; | |
2340 | pt_prev = ptype; | |
2341 | } | |
2342 | ||
2343 | if (ptype_list == &ptype_all) { | |
2344 | ptype_list = &dev->ptype_all; | |
2345 | goto again; | |
1da177e4 | 2346 | } |
7866a621 | 2347 | out_unlock: |
581fe0ea WB |
2348 | if (pt_prev) { |
2349 | if (!skb_orphan_frags_rx(skb2, GFP_ATOMIC)) | |
2350 | pt_prev->func(skb2, skb->dev, pt_prev, skb->dev); | |
2351 | else | |
2352 | kfree_skb(skb2); | |
2353 | } | |
1da177e4 LT |
2354 | rcu_read_unlock(); |
2355 | } | |
74b20582 | 2356 | EXPORT_SYMBOL_GPL(dev_queue_xmit_nit); |
1da177e4 | 2357 | |
2c53040f BH |
2358 | /** |
2359 | * netif_setup_tc - Handle tc mappings on real_num_tx_queues change | |
4f57c087 JF |
2360 | * @dev: Network device |
2361 | * @txq: number of queues available | |
2362 | * | |
2363 | * If real_num_tx_queues is changed the tc mappings may no longer be | |
2364 | * valid. To resolve this verify the tc mapping remains valid and if | |
2365 | * not NULL the mapping. With no priorities mapping to this | |
2366 | * offset/count pair it will no longer be used. In the worst case TC0 | |
2367 | * is invalid nothing can be done so disable priority mappings. If is | |
2368 | * expected that drivers will fix this mapping if they can before | |
2369 | * calling netif_set_real_num_tx_queues. | |
2370 | */ | |
bb134d22 | 2371 | static void netif_setup_tc(struct net_device *dev, unsigned int txq) |
4f57c087 JF |
2372 | { |
2373 | int i; | |
2374 | struct netdev_tc_txq *tc = &dev->tc_to_txq[0]; | |
2375 | ||
2376 | /* If TC0 is invalidated disable TC mapping */ | |
2377 | if (tc->offset + tc->count > txq) { | |
7b6cd1ce | 2378 | pr_warn("Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n"); |
4f57c087 JF |
2379 | dev->num_tc = 0; |
2380 | return; | |
2381 | } | |
2382 | ||
2383 | /* Invalidated prio to tc mappings set to TC0 */ | |
2384 | for (i = 1; i < TC_BITMASK + 1; i++) { | |
2385 | int q = netdev_get_prio_tc_map(dev, i); | |
2386 | ||
2387 | tc = &dev->tc_to_txq[q]; | |
2388 | if (tc->offset + tc->count > txq) { | |
7b6cd1ce JP |
2389 | pr_warn("Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n", |
2390 | i, q); | |
4f57c087 JF |
2391 | netdev_set_prio_tc_map(dev, i, 0); |
2392 | } | |
2393 | } | |
2394 | } | |
2395 | ||
8d059b0f AD |
2396 | int netdev_txq_to_tc(struct net_device *dev, unsigned int txq) |
2397 | { | |
2398 | if (dev->num_tc) { | |
2399 | struct netdev_tc_txq *tc = &dev->tc_to_txq[0]; | |
2400 | int i; | |
2401 | ||
ffcfe25b | 2402 | /* walk through the TCs and see if it falls into any of them */ |
8d059b0f AD |
2403 | for (i = 0; i < TC_MAX_QUEUE; i++, tc++) { |
2404 | if ((txq - tc->offset) < tc->count) | |
2405 | return i; | |
2406 | } | |
2407 | ||
ffcfe25b | 2408 | /* didn't find it, just return -1 to indicate no match */ |
8d059b0f AD |
2409 | return -1; |
2410 | } | |
2411 | ||
2412 | return 0; | |
2413 | } | |
8a5f2166 | 2414 | EXPORT_SYMBOL(netdev_txq_to_tc); |
8d059b0f | 2415 | |
537c00de | 2416 | #ifdef CONFIG_XPS |
04157469 AN |
2417 | struct static_key xps_needed __read_mostly; |
2418 | EXPORT_SYMBOL(xps_needed); | |
2419 | struct static_key xps_rxqs_needed __read_mostly; | |
2420 | EXPORT_SYMBOL(xps_rxqs_needed); | |
537c00de AD |
2421 | static DEFINE_MUTEX(xps_map_mutex); |
2422 | #define xmap_dereference(P) \ | |
2423 | rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex)) | |
2424 | ||
6234f874 AD |
2425 | static bool remove_xps_queue(struct xps_dev_maps *dev_maps, |
2426 | int tci, u16 index) | |
537c00de | 2427 | { |
10cdc3f3 AD |
2428 | struct xps_map *map = NULL; |
2429 | int pos; | |
537c00de | 2430 | |
10cdc3f3 | 2431 | if (dev_maps) |
80d19669 | 2432 | map = xmap_dereference(dev_maps->attr_map[tci]); |
6234f874 AD |
2433 | if (!map) |
2434 | return false; | |
537c00de | 2435 | |
6234f874 AD |
2436 | for (pos = map->len; pos--;) { |
2437 | if (map->queues[pos] != index) | |
2438 | continue; | |
2439 | ||
2440 | if (map->len > 1) { | |
2441 | map->queues[pos] = map->queues[--map->len]; | |
10cdc3f3 | 2442 | break; |
537c00de | 2443 | } |
6234f874 | 2444 | |
80d19669 | 2445 | RCU_INIT_POINTER(dev_maps->attr_map[tci], NULL); |
6234f874 AD |
2446 | kfree_rcu(map, rcu); |
2447 | return false; | |
537c00de AD |
2448 | } |
2449 | ||
6234f874 | 2450 | return true; |
10cdc3f3 AD |
2451 | } |
2452 | ||
6234f874 AD |
2453 | static bool remove_xps_queue_cpu(struct net_device *dev, |
2454 | struct xps_dev_maps *dev_maps, | |
2455 | int cpu, u16 offset, u16 count) | |
2456 | { | |
184c449f AD |
2457 | int num_tc = dev->num_tc ? : 1; |
2458 | bool active = false; | |
2459 | int tci; | |
6234f874 | 2460 | |
184c449f AD |
2461 | for (tci = cpu * num_tc; num_tc--; tci++) { |
2462 | int i, j; | |
2463 | ||
2464 | for (i = count, j = offset; i--; j++) { | |
6358d49a | 2465 | if (!remove_xps_queue(dev_maps, tci, j)) |
184c449f AD |
2466 | break; |
2467 | } | |
2468 | ||
2469 | active |= i < 0; | |
6234f874 AD |
2470 | } |
2471 | ||
184c449f | 2472 | return active; |
6234f874 AD |
2473 | } |
2474 | ||
867d0ad4 SD |
2475 | static void reset_xps_maps(struct net_device *dev, |
2476 | struct xps_dev_maps *dev_maps, | |
2477 | bool is_rxqs_map) | |
2478 | { | |
2479 | if (is_rxqs_map) { | |
2480 | static_key_slow_dec_cpuslocked(&xps_rxqs_needed); | |
2481 | RCU_INIT_POINTER(dev->xps_rxqs_map, NULL); | |
2482 | } else { | |
2483 | RCU_INIT_POINTER(dev->xps_cpus_map, NULL); | |
2484 | } | |
2485 | static_key_slow_dec_cpuslocked(&xps_needed); | |
2486 | kfree_rcu(dev_maps, rcu); | |
2487 | } | |
2488 | ||
80d19669 AN |
2489 | static void clean_xps_maps(struct net_device *dev, const unsigned long *mask, |
2490 | struct xps_dev_maps *dev_maps, unsigned int nr_ids, | |
2491 | u16 offset, u16 count, bool is_rxqs_map) | |
2492 | { | |
2493 | bool active = false; | |
2494 | int i, j; | |
2495 | ||
2496 | for (j = -1; j = netif_attrmask_next(j, mask, nr_ids), | |
2497 | j < nr_ids;) | |
2498 | active |= remove_xps_queue_cpu(dev, dev_maps, j, offset, | |
2499 | count); | |
867d0ad4 SD |
2500 | if (!active) |
2501 | reset_xps_maps(dev, dev_maps, is_rxqs_map); | |
80d19669 | 2502 | |
f28c020f SD |
2503 | if (!is_rxqs_map) { |
2504 | for (i = offset + (count - 1); count--; i--) { | |
2505 | netdev_queue_numa_node_write( | |
2506 | netdev_get_tx_queue(dev, i), | |
2507 | NUMA_NO_NODE); | |
80d19669 | 2508 | } |
80d19669 AN |
2509 | } |
2510 | } | |
2511 | ||
6234f874 AD |
2512 | static void netif_reset_xps_queues(struct net_device *dev, u16 offset, |
2513 | u16 count) | |
10cdc3f3 | 2514 | { |
80d19669 | 2515 | const unsigned long *possible_mask = NULL; |
10cdc3f3 | 2516 | struct xps_dev_maps *dev_maps; |
80d19669 | 2517 | unsigned int nr_ids; |
10cdc3f3 | 2518 | |
04157469 AN |
2519 | if (!static_key_false(&xps_needed)) |
2520 | return; | |
10cdc3f3 | 2521 | |
4d99f660 | 2522 | cpus_read_lock(); |
04157469 | 2523 | mutex_lock(&xps_map_mutex); |
10cdc3f3 | 2524 | |
04157469 AN |
2525 | if (static_key_false(&xps_rxqs_needed)) { |
2526 | dev_maps = xmap_dereference(dev->xps_rxqs_map); | |
2527 | if (dev_maps) { | |
2528 | nr_ids = dev->num_rx_queues; | |
2529 | clean_xps_maps(dev, possible_mask, dev_maps, nr_ids, | |
2530 | offset, count, true); | |
2531 | } | |
537c00de AD |
2532 | } |
2533 | ||
80d19669 AN |
2534 | dev_maps = xmap_dereference(dev->xps_cpus_map); |
2535 | if (!dev_maps) | |
2536 | goto out_no_maps; | |
2537 | ||
2538 | if (num_possible_cpus() > 1) | |
2539 | possible_mask = cpumask_bits(cpu_possible_mask); | |
2540 | nr_ids = nr_cpu_ids; | |
2541 | clean_xps_maps(dev, possible_mask, dev_maps, nr_ids, offset, count, | |
2542 | false); | |
024e9679 | 2543 | |
537c00de AD |
2544 | out_no_maps: |
2545 | mutex_unlock(&xps_map_mutex); | |
4d99f660 | 2546 | cpus_read_unlock(); |
537c00de AD |
2547 | } |
2548 | ||
6234f874 AD |
2549 | static void netif_reset_xps_queues_gt(struct net_device *dev, u16 index) |
2550 | { | |
2551 | netif_reset_xps_queues(dev, index, dev->num_tx_queues - index); | |
2552 | } | |
2553 | ||
80d19669 AN |
2554 | static struct xps_map *expand_xps_map(struct xps_map *map, int attr_index, |
2555 | u16 index, bool is_rxqs_map) | |
01c5f864 AD |
2556 | { |
2557 | struct xps_map *new_map; | |
2558 | int alloc_len = XPS_MIN_MAP_ALLOC; | |
2559 | int i, pos; | |
2560 | ||
2561 | for (pos = 0; map && pos < map->len; pos++) { | |
2562 | if (map->queues[pos] != index) | |
2563 | continue; | |
2564 | return map; | |
2565 | } | |
2566 | ||
80d19669 | 2567 | /* Need to add tx-queue to this CPU's/rx-queue's existing map */ |
01c5f864 AD |
2568 | if (map) { |
2569 | if (pos < map->alloc_len) | |
2570 | return map; | |
2571 | ||
2572 | alloc_len = map->alloc_len * 2; | |
2573 | } | |
2574 | ||
80d19669 AN |
2575 | /* Need to allocate new map to store tx-queue on this CPU's/rx-queue's |
2576 | * map | |
2577 | */ | |
2578 | if (is_rxqs_map) | |
2579 | new_map = kzalloc(XPS_MAP_SIZE(alloc_len), GFP_KERNEL); | |
2580 | else | |
2581 | new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len), GFP_KERNEL, | |
2582 | cpu_to_node(attr_index)); | |
01c5f864 AD |
2583 | if (!new_map) |
2584 | return NULL; | |
2585 | ||
2586 | for (i = 0; i < pos; i++) | |
2587 | new_map->queues[i] = map->queues[i]; | |
2588 | new_map->alloc_len = alloc_len; | |
2589 | new_map->len = pos; | |
2590 | ||
2591 | return new_map; | |
2592 | } | |
2593 | ||
4d99f660 | 2594 | /* Must be called under cpus_read_lock */ |
80d19669 AN |
2595 | int __netif_set_xps_queue(struct net_device *dev, const unsigned long *mask, |
2596 | u16 index, bool is_rxqs_map) | |
537c00de | 2597 | { |
80d19669 | 2598 | const unsigned long *online_mask = NULL, *possible_mask = NULL; |
01c5f864 | 2599 | struct xps_dev_maps *dev_maps, *new_dev_maps = NULL; |
80d19669 | 2600 | int i, j, tci, numa_node_id = -2; |
184c449f | 2601 | int maps_sz, num_tc = 1, tc = 0; |
537c00de | 2602 | struct xps_map *map, *new_map; |
01c5f864 | 2603 | bool active = false; |
80d19669 | 2604 | unsigned int nr_ids; |
537c00de | 2605 | |
184c449f | 2606 | if (dev->num_tc) { |
ffcfe25b | 2607 | /* Do not allow XPS on subordinate device directly */ |
184c449f | 2608 | num_tc = dev->num_tc; |
ffcfe25b AD |
2609 | if (num_tc < 0) |
2610 | return -EINVAL; | |
2611 | ||
2612 | /* If queue belongs to subordinate dev use its map */ | |
2613 | dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev; | |
2614 | ||
184c449f AD |
2615 | tc = netdev_txq_to_tc(dev, index); |
2616 | if (tc < 0) | |
2617 | return -EINVAL; | |
2618 | } | |
2619 | ||
537c00de | 2620 | mutex_lock(&xps_map_mutex); |
80d19669 AN |
2621 | if (is_rxqs_map) { |
2622 | maps_sz = XPS_RXQ_DEV_MAPS_SIZE(num_tc, dev->num_rx_queues); | |
2623 | dev_maps = xmap_dereference(dev->xps_rxqs_map); | |
2624 | nr_ids = dev->num_rx_queues; | |
2625 | } else { | |
2626 | maps_sz = XPS_CPU_DEV_MAPS_SIZE(num_tc); | |
2627 | if (num_possible_cpus() > 1) { | |
2628 | online_mask = cpumask_bits(cpu_online_mask); | |
2629 | possible_mask = cpumask_bits(cpu_possible_mask); | |
2630 | } | |
2631 | dev_maps = xmap_dereference(dev->xps_cpus_map); | |
2632 | nr_ids = nr_cpu_ids; | |
2633 | } | |
537c00de | 2634 | |
80d19669 AN |
2635 | if (maps_sz < L1_CACHE_BYTES) |
2636 | maps_sz = L1_CACHE_BYTES; | |
537c00de | 2637 | |
01c5f864 | 2638 | /* allocate memory for queue storage */ |
80d19669 AN |
2639 | for (j = -1; j = netif_attrmask_next_and(j, online_mask, mask, nr_ids), |
2640 | j < nr_ids;) { | |
01c5f864 AD |
2641 | if (!new_dev_maps) |
2642 | new_dev_maps = kzalloc(maps_sz, GFP_KERNEL); | |
2bb60cb9 AD |
2643 | if (!new_dev_maps) { |
2644 | mutex_unlock(&xps_map_mutex); | |
01c5f864 | 2645 | return -ENOMEM; |
2bb60cb9 | 2646 | } |
01c5f864 | 2647 | |
80d19669 AN |
2648 | tci = j * num_tc + tc; |
2649 | map = dev_maps ? xmap_dereference(dev_maps->attr_map[tci]) : | |
01c5f864 AD |
2650 | NULL; |
2651 | ||
80d19669 | 2652 | map = expand_xps_map(map, j, index, is_rxqs_map); |
01c5f864 AD |
2653 | if (!map) |
2654 | goto error; | |
2655 | ||
80d19669 | 2656 | RCU_INIT_POINTER(new_dev_maps->attr_map[tci], map); |
01c5f864 AD |
2657 | } |
2658 | ||
2659 | if (!new_dev_maps) | |
2660 | goto out_no_new_maps; | |
2661 | ||
867d0ad4 SD |
2662 | if (!dev_maps) { |
2663 | /* Increment static keys at most once per type */ | |
2664 | static_key_slow_inc_cpuslocked(&xps_needed); | |
2665 | if (is_rxqs_map) | |
2666 | static_key_slow_inc_cpuslocked(&xps_rxqs_needed); | |
2667 | } | |
04157469 | 2668 | |
80d19669 AN |
2669 | for (j = -1; j = netif_attrmask_next(j, possible_mask, nr_ids), |
2670 | j < nr_ids;) { | |
184c449f | 2671 | /* copy maps belonging to foreign traffic classes */ |
80d19669 | 2672 | for (i = tc, tci = j * num_tc; dev_maps && i--; tci++) { |
184c449f | 2673 | /* fill in the new device map from the old device map */ |
80d19669 AN |
2674 | map = xmap_dereference(dev_maps->attr_map[tci]); |
2675 | RCU_INIT_POINTER(new_dev_maps->attr_map[tci], map); | |
184c449f AD |
2676 | } |
2677 | ||
2678 | /* We need to explicitly update tci as prevous loop | |
2679 | * could break out early if dev_maps is NULL. | |
2680 | */ | |
80d19669 | 2681 | tci = j * num_tc + tc; |
184c449f | 2682 | |
80d19669 AN |
2683 | if (netif_attr_test_mask(j, mask, nr_ids) && |
2684 | netif_attr_test_online(j, online_mask, nr_ids)) { | |
2685 | /* add tx-queue to CPU/rx-queue maps */ | |
01c5f864 AD |
2686 | int pos = 0; |
2687 | ||
80d19669 | 2688 | map = xmap_dereference(new_dev_maps->attr_map[tci]); |
01c5f864 AD |
2689 | while ((pos < map->len) && (map->queues[pos] != index)) |
2690 | pos++; | |
2691 | ||
2692 | if (pos == map->len) | |
2693 | map->queues[map->len++] = index; | |
537c00de | 2694 | #ifdef CONFIG_NUMA |
80d19669 AN |
2695 | if (!is_rxqs_map) { |
2696 | if (numa_node_id == -2) | |
2697 | numa_node_id = cpu_to_node(j); | |
2698 | else if (numa_node_id != cpu_to_node(j)) | |
2699 | numa_node_id = -1; | |
2700 | } | |
537c00de | 2701 | #endif |
01c5f864 AD |
2702 | } else if (dev_maps) { |
2703 | /* fill in the new device map from the old device map */ | |
80d19669 AN |
2704 | map = xmap_dereference(dev_maps->attr_map[tci]); |
2705 | RCU_INIT_POINTER(new_dev_maps->attr_map[tci], map); | |
537c00de | 2706 | } |
01c5f864 | 2707 | |
184c449f AD |
2708 | /* copy maps belonging to foreign traffic classes */ |
2709 | for (i = num_tc - tc, tci++; dev_maps && --i; tci++) { | |
2710 | /* fill in the new device map from the old device map */ | |
80d19669 AN |
2711 | map = xmap_dereference(dev_maps->attr_map[tci]); |
2712 | RCU_INIT_POINTER(new_dev_maps->attr_map[tci], map); | |
184c449f | 2713 | } |
537c00de AD |
2714 | } |
2715 | ||
80d19669 AN |
2716 | if (is_rxqs_map) |
2717 | rcu_assign_pointer(dev->xps_rxqs_map, new_dev_maps); | |
2718 | else | |
2719 | rcu_assign_pointer(dev->xps_cpus_map, new_dev_maps); | |
01c5f864 | 2720 | |
537c00de | 2721 | /* Cleanup old maps */ |
184c449f AD |
2722 | if (!dev_maps) |
2723 | goto out_no_old_maps; | |
2724 | ||
80d19669 AN |
2725 | for (j = -1; j = netif_attrmask_next(j, possible_mask, nr_ids), |
2726 | j < nr_ids;) { | |
2727 | for (i = num_tc, tci = j * num_tc; i--; tci++) { | |
2728 | new_map = xmap_dereference(new_dev_maps->attr_map[tci]); | |
2729 | map = xmap_dereference(dev_maps->attr_map[tci]); | |
01c5f864 AD |
2730 | if (map && map != new_map) |
2731 | kfree_rcu(map, rcu); | |
2732 | } | |
537c00de AD |
2733 | } |
2734 | ||
184c449f AD |
2735 | kfree_rcu(dev_maps, rcu); |
2736 | ||
2737 | out_no_old_maps: | |
01c5f864 AD |
2738 | dev_maps = new_dev_maps; |
2739 | active = true; | |
537c00de | 2740 | |
01c5f864 | 2741 | out_no_new_maps: |
80d19669 AN |
2742 | if (!is_rxqs_map) { |
2743 | /* update Tx queue numa node */ | |
2744 | netdev_queue_numa_node_write(netdev_get_tx_queue(dev, index), | |
2745 | (numa_node_id >= 0) ? | |
2746 | numa_node_id : NUMA_NO_NODE); | |
2747 | } | |
537c00de | 2748 | |
01c5f864 AD |
2749 | if (!dev_maps) |
2750 | goto out_no_maps; | |
2751 | ||
80d19669 AN |
2752 | /* removes tx-queue from unused CPUs/rx-queues */ |
2753 | for (j = -1; j = netif_attrmask_next(j, possible_mask, nr_ids), | |
2754 | j < nr_ids;) { | |
2755 | for (i = tc, tci = j * num_tc; i--; tci++) | |
184c449f | 2756 | active |= remove_xps_queue(dev_maps, tci, index); |
80d19669 AN |
2757 | if (!netif_attr_test_mask(j, mask, nr_ids) || |
2758 | !netif_attr_test_online(j, online_mask, nr_ids)) | |
184c449f AD |
2759 | active |= remove_xps_queue(dev_maps, tci, index); |
2760 | for (i = num_tc - tc, tci++; --i; tci++) | |
2761 | active |= remove_xps_queue(dev_maps, tci, index); | |
01c5f864 AD |
2762 | } |
2763 | ||
2764 | /* free map if not active */ | |
867d0ad4 SD |
2765 | if (!active) |
2766 | reset_xps_maps(dev, dev_maps, is_rxqs_map); | |
01c5f864 AD |
2767 | |
2768 | out_no_maps: | |
537c00de AD |
2769 | mutex_unlock(&xps_map_mutex); |
2770 | ||
2771 | return 0; | |
2772 | error: | |
01c5f864 | 2773 | /* remove any maps that we added */ |
80d19669 AN |
2774 | for (j = -1; j = netif_attrmask_next(j, possible_mask, nr_ids), |
2775 | j < nr_ids;) { | |
2776 | for (i = num_tc, tci = j * num_tc; i--; tci++) { | |
2777 | new_map = xmap_dereference(new_dev_maps->attr_map[tci]); | |
184c449f | 2778 | map = dev_maps ? |
80d19669 | 2779 | xmap_dereference(dev_maps->attr_map[tci]) : |
184c449f AD |
2780 | NULL; |
2781 | if (new_map && new_map != map) | |
2782 | kfree(new_map); | |
2783 | } | |
01c5f864 AD |
2784 | } |
2785 | ||
537c00de AD |
2786 | mutex_unlock(&xps_map_mutex); |
2787 | ||
537c00de AD |
2788 | kfree(new_dev_maps); |
2789 | return -ENOMEM; | |
2790 | } | |
4d99f660 | 2791 | EXPORT_SYMBOL_GPL(__netif_set_xps_queue); |
80d19669 AN |
2792 | |
2793 | int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask, | |
2794 | u16 index) | |
2795 | { | |
4d99f660 AV |
2796 | int ret; |
2797 | ||
2798 | cpus_read_lock(); | |
2799 | ret = __netif_set_xps_queue(dev, cpumask_bits(mask), index, false); | |
2800 | cpus_read_unlock(); | |
2801 | ||
2802 | return ret; | |
80d19669 | 2803 | } |
537c00de AD |
2804 | EXPORT_SYMBOL(netif_set_xps_queue); |
2805 | ||
2806 | #endif | |
ffcfe25b AD |
2807 | static void netdev_unbind_all_sb_channels(struct net_device *dev) |
2808 | { | |
2809 | struct netdev_queue *txq = &dev->_tx[dev->num_tx_queues]; | |
2810 | ||
2811 | /* Unbind any subordinate channels */ | |
2812 | while (txq-- != &dev->_tx[0]) { | |
2813 | if (txq->sb_dev) | |
2814 | netdev_unbind_sb_channel(dev, txq->sb_dev); | |
2815 | } | |
2816 | } | |
2817 | ||
9cf1f6a8 AD |
2818 | void netdev_reset_tc(struct net_device *dev) |
2819 | { | |
6234f874 AD |
2820 | #ifdef CONFIG_XPS |
2821 | netif_reset_xps_queues_gt(dev, 0); | |
2822 | #endif | |
ffcfe25b AD |
2823 | netdev_unbind_all_sb_channels(dev); |
2824 | ||
2825 | /* Reset TC configuration of device */ | |
9cf1f6a8 AD |
2826 | dev->num_tc = 0; |
2827 | memset(dev->tc_to_txq, 0, sizeof(dev->tc_to_txq)); | |
2828 | memset(dev->prio_tc_map, 0, sizeof(dev->prio_tc_map)); | |
2829 | } | |
2830 | EXPORT_SYMBOL(netdev_reset_tc); | |
2831 | ||
2832 | int netdev_set_tc_queue(struct net_device *dev, u8 tc, u16 count, u16 offset) | |
2833 | { | |
2834 | if (tc >= dev->num_tc) | |
2835 | return -EINVAL; | |
2836 | ||
6234f874 AD |
2837 | #ifdef CONFIG_XPS |
2838 | netif_reset_xps_queues(dev, offset, count); | |
2839 | #endif | |
9cf1f6a8 AD |
2840 | dev->tc_to_txq[tc].count = count; |
2841 | dev->tc_to_txq[tc].offset = offset; | |
2842 | return 0; | |
2843 | } | |
2844 | EXPORT_SYMBOL(netdev_set_tc_queue); | |
2845 | ||
2846 | int netdev_set_num_tc(struct net_device *dev, u8 num_tc) | |
2847 | { | |
2848 | if (num_tc > TC_MAX_QUEUE) | |
2849 | return -EINVAL; | |
2850 | ||
6234f874 AD |
2851 | #ifdef CONFIG_XPS |
2852 | netif_reset_xps_queues_gt(dev, 0); | |
2853 | #endif | |
ffcfe25b AD |
2854 | netdev_unbind_all_sb_channels(dev); |
2855 | ||
9cf1f6a8 AD |
2856 | dev->num_tc = num_tc; |
2857 | return 0; | |
2858 | } | |
2859 | EXPORT_SYMBOL(netdev_set_num_tc); | |
2860 | ||
ffcfe25b AD |
2861 | void netdev_unbind_sb_channel(struct net_device *dev, |
2862 | struct net_device *sb_dev) | |
2863 | { | |
2864 | struct netdev_queue *txq = &dev->_tx[dev->num_tx_queues]; | |
2865 | ||
2866 | #ifdef CONFIG_XPS | |
2867 | netif_reset_xps_queues_gt(sb_dev, 0); | |
2868 | #endif | |
2869 | memset(sb_dev->tc_to_txq, 0, sizeof(sb_dev->tc_to_txq)); | |
2870 | memset(sb_dev->prio_tc_map, 0, sizeof(sb_dev->prio_tc_map)); | |
2871 | ||
2872 | while (txq-- != &dev->_tx[0]) { | |
2873 | if (txq->sb_dev == sb_dev) | |
2874 | txq->sb_dev = NULL; | |
2875 | } | |
2876 | } | |
2877 | EXPORT_SYMBOL(netdev_unbind_sb_channel); | |
2878 | ||
2879 | int netdev_bind_sb_channel_queue(struct net_device *dev, | |
2880 | struct net_device *sb_dev, | |
2881 | u8 tc, u16 count, u16 offset) | |
2882 | { | |
2883 | /* Make certain the sb_dev and dev are already configured */ | |
2884 | if (sb_dev->num_tc >= 0 || tc >= dev->num_tc) | |
2885 | return -EINVAL; | |
2886 | ||
2887 | /* We cannot hand out queues we don't have */ | |
2888 | if ((offset + count) > dev->real_num_tx_queues) | |
2889 | return -EINVAL; | |
2890 | ||
2891 | /* Record the mapping */ | |
2892 | sb_dev->tc_to_txq[tc].count = count; | |
2893 | sb_dev->tc_to_txq[tc].offset = offset; | |
2894 | ||
2895 | /* Provide a way for Tx queue to find the tc_to_txq map or | |
2896 | * XPS map for itself. | |
2897 | */ | |
2898 | while (count--) | |
2899 | netdev_get_tx_queue(dev, count + offset)->sb_dev = sb_dev; | |
2900 | ||
2901 | return 0; | |
2902 | } | |
2903 | EXPORT_SYMBOL(netdev_bind_sb_channel_queue); | |
2904 | ||
2905 | int netdev_set_sb_channel(struct net_device *dev, u16 channel) | |
2906 | { | |
2907 | /* Do not use a multiqueue device to represent a subordinate channel */ | |
2908 | if (netif_is_multiqueue(dev)) | |
2909 | return -ENODEV; | |
2910 | ||
2911 | /* We allow channels 1 - 32767 to be used for subordinate channels. | |
2912 | * Channel 0 is meant to be "native" mode and used only to represent | |
2913 | * the main root device. We allow writing 0 to reset the device back | |
2914 | * to normal mode after being used as a subordinate channel. | |
2915 | */ | |
2916 | if (channel > S16_MAX) | |
2917 | return -EINVAL; | |
2918 | ||
2919 | dev->num_tc = -channel; | |
2920 | ||
2921 | return 0; | |
2922 | } | |
2923 | EXPORT_SYMBOL(netdev_set_sb_channel); | |
2924 | ||
f0796d5c JF |
2925 | /* |
2926 | * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues | |
3a053b1a | 2927 | * greater than real_num_tx_queues stale skbs on the qdisc must be flushed. |
f0796d5c | 2928 | */ |
e6484930 | 2929 | int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq) |
f0796d5c | 2930 | { |
ac5b7019 | 2931 | bool disabling; |
1d24eb48 TH |
2932 | int rc; |
2933 | ||
ac5b7019 JK |
2934 | disabling = txq < dev->real_num_tx_queues; |
2935 | ||
e6484930 TH |
2936 | if (txq < 1 || txq > dev->num_tx_queues) |
2937 | return -EINVAL; | |
f0796d5c | 2938 | |
5c56580b BH |
2939 | if (dev->reg_state == NETREG_REGISTERED || |
2940 | dev->reg_state == NETREG_UNREGISTERING) { | |
e6484930 TH |
2941 | ASSERT_RTNL(); |
2942 | ||
1d24eb48 TH |
2943 | rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues, |
2944 | txq); | |
bf264145 TH |
2945 | if (rc) |
2946 | return rc; | |
2947 | ||
4f57c087 JF |
2948 | if (dev->num_tc) |
2949 | netif_setup_tc(dev, txq); | |
2950 | ||
ac5b7019 JK |
2951 | dev->real_num_tx_queues = txq; |
2952 | ||
2953 | if (disabling) { | |
2954 | synchronize_net(); | |
e6484930 | 2955 | qdisc_reset_all_tx_gt(dev, txq); |
024e9679 AD |
2956 | #ifdef CONFIG_XPS |
2957 | netif_reset_xps_queues_gt(dev, txq); | |
2958 | #endif | |
2959 | } | |
ac5b7019 JK |
2960 | } else { |
2961 | dev->real_num_tx_queues = txq; | |
f0796d5c | 2962 | } |
e6484930 | 2963 | |
e6484930 | 2964 | return 0; |
f0796d5c JF |
2965 | } |
2966 | EXPORT_SYMBOL(netif_set_real_num_tx_queues); | |
56079431 | 2967 | |
a953be53 | 2968 | #ifdef CONFIG_SYSFS |
62fe0b40 BH |
2969 | /** |
2970 | * netif_set_real_num_rx_queues - set actual number of RX queues used | |
2971 | * @dev: Network device | |
2972 | * @rxq: Actual number of RX queues | |
2973 | * | |
2974 | * This must be called either with the rtnl_lock held or before | |
2975 | * registration of the net device. Returns 0 on success, or a | |
4e7f7951 BH |
2976 | * negative error code. If called before registration, it always |
2977 | * succeeds. | |
62fe0b40 BH |
2978 | */ |
2979 | int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq) | |
2980 | { | |
2981 | int rc; | |
2982 | ||
bd25fa7b TH |
2983 | if (rxq < 1 || rxq > dev->num_rx_queues) |
2984 | return -EINVAL; | |
2985 | ||
62fe0b40 BH |
2986 | if (dev->reg_state == NETREG_REGISTERED) { |
2987 | ASSERT_RTNL(); | |
2988 | ||
62fe0b40 BH |
2989 | rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues, |
2990 | rxq); | |
2991 | if (rc) | |
2992 | return rc; | |
62fe0b40 BH |
2993 | } |
2994 | ||
2995 | dev->real_num_rx_queues = rxq; | |
2996 | return 0; | |
2997 | } | |
2998 | EXPORT_SYMBOL(netif_set_real_num_rx_queues); | |
2999 | #endif | |
3000 | ||
2c53040f BH |
3001 | /** |
3002 | * netif_get_num_default_rss_queues - default number of RSS queues | |
16917b87 YM |
3003 | * |
3004 | * This routine should set an upper limit on the number of RSS queues | |
3005 | * used by default by multiqueue devices. | |
3006 | */ | |
a55b138b | 3007 | int netif_get_num_default_rss_queues(void) |
16917b87 | 3008 | { |
40e4e713 HS |
3009 | return is_kdump_kernel() ? |
3010 | 1 : min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES, num_online_cpus()); | |
16917b87 YM |
3011 | } |
3012 | EXPORT_SYMBOL(netif_get_num_default_rss_queues); | |
3013 | ||
3bcb846c | 3014 | static void __netif_reschedule(struct Qdisc *q) |
56079431 | 3015 | { |
def82a1d JP |
3016 | struct softnet_data *sd; |
3017 | unsigned long flags; | |
56079431 | 3018 | |
def82a1d | 3019 | local_irq_save(flags); |
903ceff7 | 3020 | sd = this_cpu_ptr(&softnet_data); |
a9cbd588 CG |
3021 | q->next_sched = NULL; |
3022 | *sd->output_queue_tailp = q; | |
3023 | sd->output_queue_tailp = &q->next_sched; | |
def82a1d JP |
3024 | raise_softirq_irqoff(NET_TX_SOFTIRQ); |
3025 | local_irq_restore(flags); | |
3026 | } | |
3027 | ||
3028 | void __netif_schedule(struct Qdisc *q) | |
3029 | { | |
3030 | if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state)) | |
3031 | __netif_reschedule(q); | |
56079431 DV |
3032 | } |
3033 | EXPORT_SYMBOL(__netif_schedule); | |
3034 | ||
e6247027 ED |
3035 | struct dev_kfree_skb_cb { |
3036 | enum skb_free_reason reason; | |
3037 | }; | |
3038 | ||
3039 | static struct dev_kfree_skb_cb *get_kfree_skb_cb(const struct sk_buff *skb) | |
56079431 | 3040 | { |
e6247027 ED |
3041 | return (struct dev_kfree_skb_cb *)skb->cb; |
3042 | } | |
3043 | ||
46e5da40 JF |
3044 | void netif_schedule_queue(struct netdev_queue *txq) |
3045 | { | |
3046 | rcu_read_lock(); | |
5be5515a | 3047 | if (!netif_xmit_stopped(txq)) { |
46e5da40 JF |
3048 | struct Qdisc *q = rcu_dereference(txq->qdisc); |
3049 | ||
3050 | __netif_schedule(q); | |
3051 | } | |
3052 | rcu_read_unlock(); | |
3053 | } | |
3054 | EXPORT_SYMBOL(netif_schedule_queue); | |
3055 | ||
46e5da40 JF |
3056 | void netif_tx_wake_queue(struct netdev_queue *dev_queue) |
3057 | { | |
3058 | if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state)) { | |
3059 | struct Qdisc *q; | |
3060 | ||
3061 | rcu_read_lock(); | |
3062 | q = rcu_dereference(dev_queue->qdisc); | |
3063 | __netif_schedule(q); | |
3064 | rcu_read_unlock(); | |
3065 | } | |
3066 | } | |
3067 | EXPORT_SYMBOL(netif_tx_wake_queue); | |
3068 | ||
e6247027 | 3069 | void __dev_kfree_skb_irq(struct sk_buff *skb, enum skb_free_reason reason) |
56079431 | 3070 | { |
e6247027 | 3071 | unsigned long flags; |
56079431 | 3072 | |
9899886d MJ |
3073 | if (unlikely(!skb)) |
3074 | return; | |
3075 | ||
63354797 | 3076 | if (likely(refcount_read(&skb->users) == 1)) { |
e6247027 | 3077 | smp_rmb(); |
63354797 RE |
3078 | refcount_set(&skb->users, 0); |
3079 | } else if (likely(!refcount_dec_and_test(&skb->users))) { | |
e6247027 | 3080 | return; |
bea3348e | 3081 | } |
e6247027 ED |
3082 | get_kfree_skb_cb(skb)->reason = reason; |
3083 | local_irq_save(flags); | |
3084 | skb->next = __this_cpu_read(softnet_data.completion_queue); | |
3085 | __this_cpu_write(softnet_data.completion_queue, skb); | |
3086 | raise_softirq_irqoff(NET_TX_SOFTIRQ); | |
3087 | local_irq_restore(flags); | |
56079431 | 3088 | } |
e6247027 | 3089 | EXPORT_SYMBOL(__dev_kfree_skb_irq); |
56079431 | 3090 | |
e6247027 | 3091 | void __dev_kfree_skb_any(struct sk_buff *skb, enum skb_free_reason reason) |
56079431 DV |
3092 | { |
3093 | if (in_irq() || irqs_disabled()) | |
e6247027 | 3094 | __dev_kfree_skb_irq(skb, reason); |
56079431 DV |
3095 | else |
3096 | dev_kfree_skb(skb); | |
3097 | } | |
e6247027 | 3098 | EXPORT_SYMBOL(__dev_kfree_skb_any); |
56079431 DV |
3099 | |
3100 | ||
bea3348e SH |
3101 | /** |
3102 | * netif_device_detach - mark device as removed | |
3103 | * @dev: network device | |
3104 | * | |
3105 | * Mark device as removed from system and therefore no longer available. | |
3106 | */ | |
56079431 DV |
3107 | void netif_device_detach(struct net_device *dev) |
3108 | { | |
3109 | if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) && | |
3110 | netif_running(dev)) { | |
d543103a | 3111 | netif_tx_stop_all_queues(dev); |
56079431 DV |
3112 | } |
3113 | } | |
3114 | EXPORT_SYMBOL(netif_device_detach); | |
3115 | ||
bea3348e SH |
3116 | /** |
3117 | * netif_device_attach - mark device as attached | |
3118 | * @dev: network device | |
3119 | * | |
3120 | * Mark device as attached from system and restart if needed. | |
3121 | */ | |
56079431 DV |
3122 | void netif_device_attach(struct net_device *dev) |
3123 | { | |
3124 | if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) && | |
3125 | netif_running(dev)) { | |
d543103a | 3126 | netif_tx_wake_all_queues(dev); |
4ec93edb | 3127 | __netdev_watchdog_up(dev); |
56079431 DV |
3128 | } |
3129 | } | |
3130 | EXPORT_SYMBOL(netif_device_attach); | |
3131 | ||
5605c762 JP |
3132 | /* |
3133 | * Returns a Tx hash based on the given packet descriptor a Tx queues' number | |
3134 | * to be used as a distribution range. | |
3135 | */ | |
eadec877 AD |
3136 | static u16 skb_tx_hash(const struct net_device *dev, |
3137 | const struct net_device *sb_dev, | |
3138 | struct sk_buff *skb) | |
5605c762 JP |
3139 | { |
3140 | u32 hash; | |
3141 | u16 qoffset = 0; | |
1b837d48 | 3142 | u16 qcount = dev->real_num_tx_queues; |
5605c762 | 3143 | |
eadec877 AD |
3144 | if (dev->num_tc) { |
3145 | u8 tc = netdev_get_prio_tc_map(dev, skb->priority); | |
3146 | ||
3147 | qoffset = sb_dev->tc_to_txq[tc].offset; | |
3148 | qcount = sb_dev->tc_to_txq[tc].count; | |
3149 | } | |
3150 | ||
5605c762 JP |
3151 | if (skb_rx_queue_recorded(skb)) { |
3152 | hash = skb_get_rx_queue(skb); | |
6e11d157 AN |
3153 | if (hash >= qoffset) |
3154 | hash -= qoffset; | |
1b837d48 AD |
3155 | while (unlikely(hash >= qcount)) |
3156 | hash -= qcount; | |
eadec877 | 3157 | return hash + qoffset; |
5605c762 JP |
3158 | } |
3159 | ||
3160 | return (u16) reciprocal_scale(skb_get_hash(skb), qcount) + qoffset; | |
3161 | } | |
5605c762 | 3162 | |
36c92474 BH |
3163 | static void skb_warn_bad_offload(const struct sk_buff *skb) |
3164 | { | |
84d15ae5 | 3165 | static const netdev_features_t null_features; |
36c92474 | 3166 | struct net_device *dev = skb->dev; |
88ad4175 | 3167 | const char *name = ""; |
36c92474 | 3168 | |
c846ad9b BG |
3169 | if (!net_ratelimit()) |
3170 | return; | |
3171 | ||
88ad4175 BM |
3172 | if (dev) { |
3173 | if (dev->dev.parent) | |
3174 | name = dev_driver_string(dev->dev.parent); | |
3175 | else | |
3176 | name = netdev_name(dev); | |
3177 | } | |
6413139d WB |
3178 | skb_dump(KERN_WARNING, skb, false); |
3179 | WARN(1, "%s: caps=(%pNF, %pNF)\n", | |
88ad4175 | 3180 | name, dev ? &dev->features : &null_features, |
6413139d | 3181 | skb->sk ? &skb->sk->sk_route_caps : &null_features); |
36c92474 BH |
3182 | } |
3183 | ||
1da177e4 LT |
3184 | /* |
3185 | * Invalidate hardware checksum when packet is to be mangled, and | |
3186 | * complete checksum manually on outgoing path. | |
3187 | */ | |
84fa7933 | 3188 | int skb_checksum_help(struct sk_buff *skb) |
1da177e4 | 3189 | { |
d3bc23e7 | 3190 | __wsum csum; |
663ead3b | 3191 | int ret = 0, offset; |
1da177e4 | 3192 | |
84fa7933 | 3193 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
a430a43d HX |
3194 | goto out_set_summed; |
3195 | ||
3aefd7d6 | 3196 | if (unlikely(skb_is_gso(skb))) { |
36c92474 BH |
3197 | skb_warn_bad_offload(skb); |
3198 | return -EINVAL; | |
1da177e4 LT |
3199 | } |
3200 | ||
cef401de ED |
3201 | /* Before computing a checksum, we should make sure no frag could |
3202 | * be modified by an external entity : checksum could be wrong. | |
3203 | */ | |
3204 | if (skb_has_shared_frag(skb)) { | |
3205 | ret = __skb_linearize(skb); | |
3206 | if (ret) | |
3207 | goto out; | |
3208 | } | |
3209 | ||
55508d60 | 3210 | offset = skb_checksum_start_offset(skb); |
a030847e HX |
3211 | BUG_ON(offset >= skb_headlen(skb)); |
3212 | csum = skb_checksum(skb, offset, skb->len - offset, 0); | |
3213 | ||
3214 | offset += skb->csum_offset; | |
3215 | BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb)); | |
3216 | ||
8211fbfa HK |
3217 | ret = skb_ensure_writable(skb, offset + sizeof(__sum16)); |
3218 | if (ret) | |
3219 | goto out; | |
1da177e4 | 3220 | |
4f2e4ad5 | 3221 | *(__sum16 *)(skb->data + offset) = csum_fold(csum) ?: CSUM_MANGLED_0; |
a430a43d | 3222 | out_set_summed: |
1da177e4 | 3223 | skb->ip_summed = CHECKSUM_NONE; |
4ec93edb | 3224 | out: |
1da177e4 LT |
3225 | return ret; |
3226 | } | |
d1b19dff | 3227 | EXPORT_SYMBOL(skb_checksum_help); |
1da177e4 | 3228 | |
b72b5bf6 DC |
3229 | int skb_crc32c_csum_help(struct sk_buff *skb) |
3230 | { | |
3231 | __le32 crc32c_csum; | |
3232 | int ret = 0, offset, start; | |
3233 | ||
3234 | if (skb->ip_summed != CHECKSUM_PARTIAL) | |
3235 | goto out; | |
3236 | ||
3237 | if (unlikely(skb_is_gso(skb))) | |
3238 | goto out; | |
3239 | ||
3240 | /* Before computing a checksum, we should make sure no frag could | |
3241 | * be modified by an external entity : checksum could be wrong. | |
3242 | */ | |
3243 | if (unlikely(skb_has_shared_frag(skb))) { | |
3244 | ret = __skb_linearize(skb); | |
3245 | if (ret) | |
3246 | goto out; | |
3247 | } | |
3248 | start = skb_checksum_start_offset(skb); | |
3249 | offset = start + offsetof(struct sctphdr, checksum); | |
3250 | if (WARN_ON_ONCE(offset >= skb_headlen(skb))) { | |
3251 | ret = -EINVAL; | |
3252 | goto out; | |
3253 | } | |
8211fbfa HK |
3254 | |
3255 | ret = skb_ensure_writable(skb, offset + sizeof(__le32)); | |
3256 | if (ret) | |
3257 | goto out; | |
3258 | ||
b72b5bf6 DC |
3259 | crc32c_csum = cpu_to_le32(~__skb_checksum(skb, start, |
3260 | skb->len - start, ~(__u32)0, | |
3261 | crc32c_csum_stub)); | |
3262 | *(__le32 *)(skb->data + offset) = crc32c_csum; | |
3263 | skb->ip_summed = CHECKSUM_NONE; | |
dba00306 | 3264 | skb->csum_not_inet = 0; |
b72b5bf6 DC |
3265 | out: |
3266 | return ret; | |
3267 | } | |
3268 | ||
53d6471c | 3269 | __be16 skb_network_protocol(struct sk_buff *skb, int *depth) |
f6a78bfc | 3270 | { |
252e3346 | 3271 | __be16 type = skb->protocol; |
f6a78bfc | 3272 | |
19acc327 PS |
3273 | /* Tunnel gso handlers can set protocol to ethernet. */ |
3274 | if (type == htons(ETH_P_TEB)) { | |
3275 | struct ethhdr *eth; | |
3276 | ||
3277 | if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr)))) | |
3278 | return 0; | |
3279 | ||
1dfe82eb | 3280 | eth = (struct ethhdr *)skb->data; |
19acc327 PS |
3281 | type = eth->h_proto; |
3282 | } | |
3283 | ||
d4bcef3f | 3284 | return __vlan_get_protocol(skb, type, depth); |
ec5f0615 PS |
3285 | } |
3286 | ||
3287 | /** | |
3288 | * skb_mac_gso_segment - mac layer segmentation handler. | |
3289 | * @skb: buffer to segment | |
3290 | * @features: features for the output path (see dev->features) | |
3291 | */ | |
3292 | struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb, | |
3293 | netdev_features_t features) | |
3294 | { | |
3295 | struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT); | |
3296 | struct packet_offload *ptype; | |
53d6471c VY |
3297 | int vlan_depth = skb->mac_len; |
3298 | __be16 type = skb_network_protocol(skb, &vlan_depth); | |
ec5f0615 PS |
3299 | |
3300 | if (unlikely(!type)) | |
3301 | return ERR_PTR(-EINVAL); | |
3302 | ||
53d6471c | 3303 | __skb_pull(skb, vlan_depth); |
f6a78bfc HX |
3304 | |
3305 | rcu_read_lock(); | |
22061d80 | 3306 | list_for_each_entry_rcu(ptype, &offload_base, list) { |
f191a1d1 | 3307 | if (ptype->type == type && ptype->callbacks.gso_segment) { |
f191a1d1 | 3308 | segs = ptype->callbacks.gso_segment(skb, features); |
f6a78bfc HX |
3309 | break; |
3310 | } | |
3311 | } | |
3312 | rcu_read_unlock(); | |
3313 | ||
98e399f8 | 3314 | __skb_push(skb, skb->data - skb_mac_header(skb)); |
576a30eb | 3315 | |
f6a78bfc HX |
3316 | return segs; |
3317 | } | |
05e8ef4a PS |
3318 | EXPORT_SYMBOL(skb_mac_gso_segment); |
3319 | ||
3320 | ||
3321 | /* openvswitch calls this on rx path, so we need a different check. | |
3322 | */ | |
3323 | static inline bool skb_needs_check(struct sk_buff *skb, bool tx_path) | |
3324 | { | |
3325 | if (tx_path) | |
0c19f846 WB |
3326 | return skb->ip_summed != CHECKSUM_PARTIAL && |
3327 | skb->ip_summed != CHECKSUM_UNNECESSARY; | |
6e7bc478 ED |
3328 | |
3329 | return skb->ip_summed == CHECKSUM_NONE; | |
05e8ef4a PS |
3330 | } |
3331 | ||
3332 | /** | |
3333 | * __skb_gso_segment - Perform segmentation on skb. | |
3334 | * @skb: buffer to segment | |
3335 | * @features: features for the output path (see dev->features) | |
3336 | * @tx_path: whether it is called in TX path | |
3337 | * | |
3338 | * This function segments the given skb and returns a list of segments. | |
3339 | * | |
3340 | * It may return NULL if the skb requires no segmentation. This is | |
3341 | * only possible when GSO is used for verifying header integrity. | |
9207f9d4 | 3342 | * |
a08e7fd9 | 3343 | * Segmentation preserves SKB_GSO_CB_OFFSET bytes of previous skb cb. |
05e8ef4a PS |
3344 | */ |
3345 | struct sk_buff *__skb_gso_segment(struct sk_buff *skb, | |
3346 | netdev_features_t features, bool tx_path) | |
3347 | { | |
b2504a5d ED |
3348 | struct sk_buff *segs; |
3349 | ||
05e8ef4a PS |
3350 | if (unlikely(skb_needs_check(skb, tx_path))) { |
3351 | int err; | |
3352 | ||
b2504a5d | 3353 | /* We're going to init ->check field in TCP or UDP header */ |
a40e0a66 | 3354 | err = skb_cow_head(skb, 0); |
3355 | if (err < 0) | |
05e8ef4a PS |
3356 | return ERR_PTR(err); |
3357 | } | |
3358 | ||
802ab55a AD |
3359 | /* Only report GSO partial support if it will enable us to |
3360 | * support segmentation on this frame without needing additional | |
3361 | * work. | |
3362 | */ | |
3363 | if (features & NETIF_F_GSO_PARTIAL) { | |
3364 | netdev_features_t partial_features = NETIF_F_GSO_ROBUST; | |
3365 | struct net_device *dev = skb->dev; | |
3366 | ||
3367 | partial_features |= dev->features & dev->gso_partial_features; | |
3368 | if (!skb_gso_ok(skb, features | partial_features)) | |
3369 | features &= ~NETIF_F_GSO_PARTIAL; | |
3370 | } | |
3371 | ||
a08e7fd9 | 3372 | BUILD_BUG_ON(SKB_GSO_CB_OFFSET + |
9207f9d4 KK |
3373 | sizeof(*SKB_GSO_CB(skb)) > sizeof(skb->cb)); |
3374 | ||
68c33163 | 3375 | SKB_GSO_CB(skb)->mac_offset = skb_headroom(skb); |
3347c960 ED |
3376 | SKB_GSO_CB(skb)->encap_level = 0; |
3377 | ||
05e8ef4a PS |
3378 | skb_reset_mac_header(skb); |
3379 | skb_reset_mac_len(skb); | |
3380 | ||
b2504a5d ED |
3381 | segs = skb_mac_gso_segment(skb, features); |
3382 | ||
3a1296a3 | 3383 | if (segs != skb && unlikely(skb_needs_check(skb, tx_path) && !IS_ERR(segs))) |
b2504a5d ED |
3384 | skb_warn_bad_offload(skb); |
3385 | ||
3386 | return segs; | |
05e8ef4a | 3387 | } |
12b0004d | 3388 | EXPORT_SYMBOL(__skb_gso_segment); |
f6a78bfc | 3389 | |
fb286bb2 HX |
3390 | /* Take action when hardware reception checksum errors are detected. */ |
3391 | #ifdef CONFIG_BUG | |
7fe50ac8 | 3392 | void netdev_rx_csum_fault(struct net_device *dev, struct sk_buff *skb) |
fb286bb2 HX |
3393 | { |
3394 | if (net_ratelimit()) { | |
7b6cd1ce | 3395 | pr_err("%s: hw csum failure\n", dev ? dev->name : "<unknown>"); |
6413139d | 3396 | skb_dump(KERN_ERR, skb, true); |
fb286bb2 HX |
3397 | dump_stack(); |
3398 | } | |
3399 | } | |
3400 | EXPORT_SYMBOL(netdev_rx_csum_fault); | |
3401 | #endif | |
3402 | ||
ab74cfeb | 3403 | /* XXX: check that highmem exists at all on the given machine. */ |
c1e756bf | 3404 | static int illegal_highdma(struct net_device *dev, struct sk_buff *skb) |
1da177e4 | 3405 | { |
3d3a8533 | 3406 | #ifdef CONFIG_HIGHMEM |
1da177e4 | 3407 | int i; |
f4563a75 | 3408 | |
5acbbd42 | 3409 | if (!(dev->features & NETIF_F_HIGHDMA)) { |
ea2ab693 IC |
3410 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { |
3411 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; | |
f4563a75 | 3412 | |
ea2ab693 | 3413 | if (PageHighMem(skb_frag_page(frag))) |
5acbbd42 | 3414 | return 1; |
ea2ab693 | 3415 | } |
5acbbd42 | 3416 | } |
3d3a8533 | 3417 | #endif |
1da177e4 LT |
3418 | return 0; |
3419 | } | |
1da177e4 | 3420 | |
3b392ddb SH |
3421 | /* If MPLS offload request, verify we are testing hardware MPLS features |
3422 | * instead of standard features for the netdev. | |
3423 | */ | |
d0edc7bf | 3424 | #if IS_ENABLED(CONFIG_NET_MPLS_GSO) |
3b392ddb SH |
3425 | static netdev_features_t net_mpls_features(struct sk_buff *skb, |
3426 | netdev_features_t features, | |
3427 | __be16 type) | |
3428 | { | |
25cd9ba0 | 3429 | if (eth_p_mpls(type)) |
3b392ddb SH |
3430 | features &= skb->dev->mpls_features; |
3431 | ||
3432 | return features; | |
3433 | } | |
3434 | #else | |
3435 | static netdev_features_t net_mpls_features(struct sk_buff *skb, | |
3436 | netdev_features_t features, | |
3437 | __be16 type) | |
3438 | { | |
3439 | return features; | |
3440 | } | |
3441 | #endif | |
3442 | ||
c8f44aff | 3443 | static netdev_features_t harmonize_features(struct sk_buff *skb, |
c1e756bf | 3444 | netdev_features_t features) |
f01a5236 | 3445 | { |
3b392ddb SH |
3446 | __be16 type; |
3447 | ||
9fc95f50 | 3448 | type = skb_network_protocol(skb, NULL); |
3b392ddb | 3449 | features = net_mpls_features(skb, features, type); |
53d6471c | 3450 | |
c0d680e5 | 3451 | if (skb->ip_summed != CHECKSUM_NONE && |
3b392ddb | 3452 | !can_checksum_protocol(features, type)) { |
996e8021 | 3453 | features &= ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK); |
f01a5236 | 3454 | } |
7be2c82c ED |
3455 | if (illegal_highdma(skb->dev, skb)) |
3456 | features &= ~NETIF_F_SG; | |
f01a5236 JG |
3457 | |
3458 | return features; | |
3459 | } | |
3460 | ||
e38f3025 TM |
3461 | netdev_features_t passthru_features_check(struct sk_buff *skb, |
3462 | struct net_device *dev, | |
3463 | netdev_features_t features) | |
3464 | { | |
3465 | return features; | |
3466 | } | |
3467 | EXPORT_SYMBOL(passthru_features_check); | |
3468 | ||
7ce23672 | 3469 | static netdev_features_t dflt_features_check(struct sk_buff *skb, |
8cb65d00 TM |
3470 | struct net_device *dev, |
3471 | netdev_features_t features) | |
3472 | { | |
3473 | return vlan_features_check(skb, features); | |
3474 | } | |
3475 | ||
cbc53e08 AD |
3476 | static netdev_features_t gso_features_check(const struct sk_buff *skb, |
3477 | struct net_device *dev, | |
3478 | netdev_features_t features) | |
3479 | { | |
3480 | u16 gso_segs = skb_shinfo(skb)->gso_segs; | |
3481 | ||
3482 | if (gso_segs > dev->gso_max_segs) | |
3483 | return features & ~NETIF_F_GSO_MASK; | |
3484 | ||
1d155dfd HK |
3485 | if (!skb_shinfo(skb)->gso_type) { |
3486 | skb_warn_bad_offload(skb); | |
3487 | return features & ~NETIF_F_GSO_MASK; | |
3488 | } | |
3489 | ||
802ab55a AD |
3490 | /* Support for GSO partial features requires software |
3491 | * intervention before we can actually process the packets | |
3492 | * so we need to strip support for any partial features now | |
3493 | * and we can pull them back in after we have partially | |
3494 | * segmented the frame. | |
3495 | */ | |
3496 | if (!(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL)) | |
3497 | features &= ~dev->gso_partial_features; | |
3498 | ||
3499 | /* Make sure to clear the IPv4 ID mangling feature if the | |
3500 | * IPv4 header has the potential to be fragmented. | |
cbc53e08 AD |
3501 | */ |
3502 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) { | |
3503 | struct iphdr *iph = skb->encapsulation ? | |
3504 | inner_ip_hdr(skb) : ip_hdr(skb); | |
3505 | ||
3506 | if (!(iph->frag_off & htons(IP_DF))) | |
3507 | features &= ~NETIF_F_TSO_MANGLEID; | |
3508 | } | |
3509 | ||
3510 | return features; | |
3511 | } | |
3512 | ||
c1e756bf | 3513 | netdev_features_t netif_skb_features(struct sk_buff *skb) |
58e998c6 | 3514 | { |
5f35227e | 3515 | struct net_device *dev = skb->dev; |
fcbeb976 | 3516 | netdev_features_t features = dev->features; |
58e998c6 | 3517 | |
cbc53e08 AD |
3518 | if (skb_is_gso(skb)) |
3519 | features = gso_features_check(skb, dev, features); | |
30b678d8 | 3520 | |
5f35227e JG |
3521 | /* If encapsulation offload request, verify we are testing |
3522 | * hardware encapsulation features instead of standard | |
3523 | * features for the netdev | |
3524 | */ | |
3525 | if (skb->encapsulation) | |
3526 | features &= dev->hw_enc_features; | |
3527 | ||
f5a7fb88 TM |
3528 | if (skb_vlan_tagged(skb)) |
3529 | features = netdev_intersect_features(features, | |
3530 | dev->vlan_features | | |
3531 | NETIF_F_HW_VLAN_CTAG_TX | | |
3532 | NETIF_F_HW_VLAN_STAG_TX); | |
f01a5236 | 3533 | |
5f35227e JG |
3534 | if (dev->netdev_ops->ndo_features_check) |
3535 | features &= dev->netdev_ops->ndo_features_check(skb, dev, | |
3536 | features); | |
8cb65d00 TM |
3537 | else |
3538 | features &= dflt_features_check(skb, dev, features); | |
5f35227e | 3539 | |
c1e756bf | 3540 | return harmonize_features(skb, features); |
58e998c6 | 3541 | } |
c1e756bf | 3542 | EXPORT_SYMBOL(netif_skb_features); |
58e998c6 | 3543 | |
2ea25513 | 3544 | static int xmit_one(struct sk_buff *skb, struct net_device *dev, |
95f6b3dd | 3545 | struct netdev_queue *txq, bool more) |
f6a78bfc | 3546 | { |
2ea25513 DM |
3547 | unsigned int len; |
3548 | int rc; | |
00829823 | 3549 | |
9f9a742d | 3550 | if (dev_nit_active(dev)) |
2ea25513 | 3551 | dev_queue_xmit_nit(skb, dev); |
fc741216 | 3552 | |
2ea25513 | 3553 | len = skb->len; |
3744741a | 3554 | PRANDOM_ADD_NOISE(skb, dev, txq, len + jiffies); |
2ea25513 | 3555 | trace_net_dev_start_xmit(skb, dev); |
95f6b3dd | 3556 | rc = netdev_start_xmit(skb, dev, txq, more); |
2ea25513 | 3557 | trace_net_dev_xmit(skb, rc, dev, len); |
adf30907 | 3558 | |
2ea25513 DM |
3559 | return rc; |
3560 | } | |
7b9c6090 | 3561 | |
8dcda22a DM |
3562 | struct sk_buff *dev_hard_start_xmit(struct sk_buff *first, struct net_device *dev, |
3563 | struct netdev_queue *txq, int *ret) | |
7f2e870f DM |
3564 | { |
3565 | struct sk_buff *skb = first; | |
3566 | int rc = NETDEV_TX_OK; | |
7b9c6090 | 3567 | |
7f2e870f DM |
3568 | while (skb) { |
3569 | struct sk_buff *next = skb->next; | |
fc70fb64 | 3570 | |
a8305bff | 3571 | skb_mark_not_on_list(skb); |
95f6b3dd | 3572 | rc = xmit_one(skb, dev, txq, next != NULL); |
7f2e870f DM |
3573 | if (unlikely(!dev_xmit_complete(rc))) { |
3574 | skb->next = next; | |
3575 | goto out; | |
3576 | } | |
6afff0ca | 3577 | |
7f2e870f | 3578 | skb = next; |
fe60faa5 | 3579 | if (netif_tx_queue_stopped(txq) && skb) { |
7f2e870f DM |
3580 | rc = NETDEV_TX_BUSY; |
3581 | break; | |
9ccb8975 | 3582 | } |
7f2e870f | 3583 | } |
9ccb8975 | 3584 | |
7f2e870f DM |
3585 | out: |
3586 | *ret = rc; | |
3587 | return skb; | |
3588 | } | |
b40863c6 | 3589 | |
1ff0dc94 ED |
3590 | static struct sk_buff *validate_xmit_vlan(struct sk_buff *skb, |
3591 | netdev_features_t features) | |
f6a78bfc | 3592 | { |
df8a39de | 3593 | if (skb_vlan_tag_present(skb) && |
5968250c JP |
3594 | !vlan_hw_offload_capable(features, skb->vlan_proto)) |
3595 | skb = __vlan_hwaccel_push_inside(skb); | |
eae3f88e DM |
3596 | return skb; |
3597 | } | |
f6a78bfc | 3598 | |
43c26a1a DC |
3599 | int skb_csum_hwoffload_help(struct sk_buff *skb, |
3600 | const netdev_features_t features) | |
3601 | { | |
3602 | if (unlikely(skb->csum_not_inet)) | |
3603 | return !!(features & NETIF_F_SCTP_CRC) ? 0 : | |
3604 | skb_crc32c_csum_help(skb); | |
3605 | ||
3606 | return !!(features & NETIF_F_CSUM_MASK) ? 0 : skb_checksum_help(skb); | |
3607 | } | |
3608 | EXPORT_SYMBOL(skb_csum_hwoffload_help); | |
3609 | ||
f53c7239 | 3610 | static struct sk_buff *validate_xmit_skb(struct sk_buff *skb, struct net_device *dev, bool *again) |
eae3f88e DM |
3611 | { |
3612 | netdev_features_t features; | |
f6a78bfc | 3613 | |
eae3f88e DM |
3614 | features = netif_skb_features(skb); |
3615 | skb = validate_xmit_vlan(skb, features); | |
3616 | if (unlikely(!skb)) | |
3617 | goto out_null; | |
7b9c6090 | 3618 | |
ebf4e808 IL |
3619 | skb = sk_validate_xmit_skb(skb, dev); |
3620 | if (unlikely(!skb)) | |
3621 | goto out_null; | |
3622 | ||
8b86a61d | 3623 | if (netif_needs_gso(skb, features)) { |
ce93718f DM |
3624 | struct sk_buff *segs; |
3625 | ||
3626 | segs = skb_gso_segment(skb, features); | |
cecda693 | 3627 | if (IS_ERR(segs)) { |
af6dabc9 | 3628 | goto out_kfree_skb; |
cecda693 JW |
3629 | } else if (segs) { |
3630 | consume_skb(skb); | |
3631 | skb = segs; | |
f6a78bfc | 3632 | } |
eae3f88e DM |
3633 | } else { |
3634 | if (skb_needs_linearize(skb, features) && | |
3635 | __skb_linearize(skb)) | |
3636 | goto out_kfree_skb; | |
4ec93edb | 3637 | |
eae3f88e DM |
3638 | /* If packet is not checksummed and device does not |
3639 | * support checksumming for this protocol, complete | |
3640 | * checksumming here. | |
3641 | */ | |
3642 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
3643 | if (skb->encapsulation) | |
3644 | skb_set_inner_transport_header(skb, | |
3645 | skb_checksum_start_offset(skb)); | |
3646 | else | |
3647 | skb_set_transport_header(skb, | |
3648 | skb_checksum_start_offset(skb)); | |
43c26a1a | 3649 | if (skb_csum_hwoffload_help(skb, features)) |
eae3f88e | 3650 | goto out_kfree_skb; |
7b9c6090 | 3651 | } |
0c772159 | 3652 | } |
7b9c6090 | 3653 | |
f53c7239 | 3654 | skb = validate_xmit_xfrm(skb, features, again); |
3dca3f38 | 3655 | |
eae3f88e | 3656 | return skb; |
fc70fb64 | 3657 | |
f6a78bfc HX |
3658 | out_kfree_skb: |
3659 | kfree_skb(skb); | |
eae3f88e | 3660 | out_null: |
d21fd63e | 3661 | atomic_long_inc(&dev->tx_dropped); |
eae3f88e DM |
3662 | return NULL; |
3663 | } | |
6afff0ca | 3664 | |
f53c7239 | 3665 | struct sk_buff *validate_xmit_skb_list(struct sk_buff *skb, struct net_device *dev, bool *again) |
55a93b3e ED |
3666 | { |
3667 | struct sk_buff *next, *head = NULL, *tail; | |
3668 | ||
bec3cfdc | 3669 | for (; skb != NULL; skb = next) { |
55a93b3e | 3670 | next = skb->next; |
a8305bff | 3671 | skb_mark_not_on_list(skb); |
bec3cfdc ED |
3672 | |
3673 | /* in case skb wont be segmented, point to itself */ | |
3674 | skb->prev = skb; | |
3675 | ||
f53c7239 | 3676 | skb = validate_xmit_skb(skb, dev, again); |
bec3cfdc ED |
3677 | if (!skb) |
3678 | continue; | |
55a93b3e | 3679 | |
bec3cfdc ED |
3680 | if (!head) |
3681 | head = skb; | |
3682 | else | |
3683 | tail->next = skb; | |
3684 | /* If skb was segmented, skb->prev points to | |
3685 | * the last segment. If not, it still contains skb. | |
3686 | */ | |
3687 | tail = skb->prev; | |
55a93b3e ED |
3688 | } |
3689 | return head; | |
f6a78bfc | 3690 | } |
104ba78c | 3691 | EXPORT_SYMBOL_GPL(validate_xmit_skb_list); |
f6a78bfc | 3692 | |
1def9238 ED |
3693 | static void qdisc_pkt_len_init(struct sk_buff *skb) |
3694 | { | |
3695 | const struct skb_shared_info *shinfo = skb_shinfo(skb); | |
3696 | ||
3697 | qdisc_skb_cb(skb)->pkt_len = skb->len; | |
3698 | ||
3699 | /* To get more precise estimation of bytes sent on wire, | |
3700 | * we add to pkt_len the headers size of all segments | |
3701 | */ | |
a0dce875 | 3702 | if (shinfo->gso_size && skb_transport_header_was_set(skb)) { |
757b8b1d | 3703 | unsigned int hdr_len; |
15e5a030 | 3704 | u16 gso_segs = shinfo->gso_segs; |
1def9238 | 3705 | |
757b8b1d ED |
3706 | /* mac layer + network layer */ |
3707 | hdr_len = skb_transport_header(skb) - skb_mac_header(skb); | |
3708 | ||
3709 | /* + transport layer */ | |
7c68d1a6 ED |
3710 | if (likely(shinfo->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6))) { |
3711 | const struct tcphdr *th; | |
3712 | struct tcphdr _tcphdr; | |
3713 | ||
3714 | th = skb_header_pointer(skb, skb_transport_offset(skb), | |
3715 | sizeof(_tcphdr), &_tcphdr); | |
3716 | if (likely(th)) | |
3717 | hdr_len += __tcp_hdrlen(th); | |
3718 | } else { | |
3719 | struct udphdr _udphdr; | |
3720 | ||
3721 | if (skb_header_pointer(skb, skb_transport_offset(skb), | |
3722 | sizeof(_udphdr), &_udphdr)) | |
3723 | hdr_len += sizeof(struct udphdr); | |
3724 | } | |
15e5a030 JW |
3725 | |
3726 | if (shinfo->gso_type & SKB_GSO_DODGY) | |
3727 | gso_segs = DIV_ROUND_UP(skb->len - hdr_len, | |
3728 | shinfo->gso_size); | |
3729 | ||
3730 | qdisc_skb_cb(skb)->pkt_len += (gso_segs - 1) * hdr_len; | |
1def9238 ED |
3731 | } |
3732 | } | |
3733 | ||
bbd8a0d3 KK |
3734 | static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q, |
3735 | struct net_device *dev, | |
3736 | struct netdev_queue *txq) | |
3737 | { | |
3738 | spinlock_t *root_lock = qdisc_lock(q); | |
520ac30f | 3739 | struct sk_buff *to_free = NULL; |
a2da570d | 3740 | bool contended; |
bbd8a0d3 KK |
3741 | int rc; |
3742 | ||
a2da570d | 3743 | qdisc_calculate_pkt_len(skb, q); |
6b3ba914 JF |
3744 | |
3745 | if (q->flags & TCQ_F_NOLOCK) { | |
ac5c66f2 | 3746 | rc = q->enqueue(skb, q, &to_free) & NET_XMIT_MASK; |
379349e9 | 3747 | qdisc_run(q); |
6b3ba914 JF |
3748 | |
3749 | if (unlikely(to_free)) | |
3750 | kfree_skb_list(to_free); | |
3751 | return rc; | |
3752 | } | |
3753 | ||
79640a4c ED |
3754 | /* |
3755 | * Heuristic to force contended enqueues to serialize on a | |
3756 | * separate lock before trying to get qdisc main lock. | |
f9eb8aea | 3757 | * This permits qdisc->running owner to get the lock more |
9bf2b8c2 | 3758 | * often and dequeue packets faster. |
79640a4c | 3759 | */ |
a2da570d | 3760 | contended = qdisc_is_running(q); |
79640a4c ED |
3761 | if (unlikely(contended)) |
3762 | spin_lock(&q->busylock); | |
3763 | ||
bbd8a0d3 KK |
3764 | spin_lock(root_lock); |
3765 | if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) { | |
520ac30f | 3766 | __qdisc_drop(skb, &to_free); |
bbd8a0d3 KK |
3767 | rc = NET_XMIT_DROP; |
3768 | } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) && | |
bc135b23 | 3769 | qdisc_run_begin(q)) { |
bbd8a0d3 KK |
3770 | /* |
3771 | * This is a work-conserving queue; there are no old skbs | |
3772 | * waiting to be sent out; and the qdisc is not running - | |
3773 | * xmit the skb directly. | |
3774 | */ | |
bfe0d029 | 3775 | |
bfe0d029 ED |
3776 | qdisc_bstats_update(q, skb); |
3777 | ||
55a93b3e | 3778 | if (sch_direct_xmit(skb, q, dev, txq, root_lock, true)) { |
79640a4c ED |
3779 | if (unlikely(contended)) { |
3780 | spin_unlock(&q->busylock); | |
3781 | contended = false; | |
3782 | } | |
bbd8a0d3 | 3783 | __qdisc_run(q); |
6c148184 | 3784 | } |
bbd8a0d3 | 3785 | |
6c148184 | 3786 | qdisc_run_end(q); |
bbd8a0d3 KK |
3787 | rc = NET_XMIT_SUCCESS; |
3788 | } else { | |
ac5c66f2 | 3789 | rc = q->enqueue(skb, q, &to_free) & NET_XMIT_MASK; |
79640a4c ED |
3790 | if (qdisc_run_begin(q)) { |
3791 | if (unlikely(contended)) { | |
3792 | spin_unlock(&q->busylock); | |
3793 | contended = false; | |
3794 | } | |
3795 | __qdisc_run(q); | |
6c148184 | 3796 | qdisc_run_end(q); |
79640a4c | 3797 | } |
bbd8a0d3 KK |
3798 | } |
3799 | spin_unlock(root_lock); | |
520ac30f ED |
3800 | if (unlikely(to_free)) |
3801 | kfree_skb_list(to_free); | |
79640a4c ED |
3802 | if (unlikely(contended)) |
3803 | spin_unlock(&q->busylock); | |
bbd8a0d3 KK |
3804 | return rc; |
3805 | } | |
3806 | ||
86f8515f | 3807 | #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO) |
5bc1421e NH |
3808 | static void skb_update_prio(struct sk_buff *skb) |
3809 | { | |
4dcb31d4 ED |
3810 | const struct netprio_map *map; |
3811 | const struct sock *sk; | |
3812 | unsigned int prioidx; | |
5bc1421e | 3813 | |
4dcb31d4 ED |
3814 | if (skb->priority) |
3815 | return; | |
3816 | map = rcu_dereference_bh(skb->dev->priomap); | |
3817 | if (!map) | |
3818 | return; | |
3819 | sk = skb_to_full_sk(skb); | |
3820 | if (!sk) | |
3821 | return; | |
91c68ce2 | 3822 | |
4dcb31d4 ED |
3823 | prioidx = sock_cgroup_prioidx(&sk->sk_cgrp_data); |
3824 | ||
3825 | if (prioidx < map->priomap_len) | |
3826 | skb->priority = map->priomap[prioidx]; | |
5bc1421e NH |
3827 | } |
3828 | #else | |
3829 | #define skb_update_prio(skb) | |
3830 | #endif | |
3831 | ||
95603e22 MM |
3832 | /** |
3833 | * dev_loopback_xmit - loop back @skb | |
0c4b51f0 EB |
3834 | * @net: network namespace this loopback is happening in |
3835 | * @sk: sk needed to be a netfilter okfn | |
95603e22 MM |
3836 | * @skb: buffer to transmit |
3837 | */ | |
0c4b51f0 | 3838 | int dev_loopback_xmit(struct net *net, struct sock *sk, struct sk_buff *skb) |
95603e22 MM |
3839 | { |
3840 | skb_reset_mac_header(skb); | |
3841 | __skb_pull(skb, skb_network_offset(skb)); | |
3842 | skb->pkt_type = PACKET_LOOPBACK; | |
3843 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
3844 | WARN_ON(!skb_dst(skb)); | |
3845 | skb_dst_force(skb); | |
3846 | netif_rx_ni(skb); | |
3847 | return 0; | |
3848 | } | |
3849 | EXPORT_SYMBOL(dev_loopback_xmit); | |
3850 | ||
1f211a1b DB |
3851 | #ifdef CONFIG_NET_EGRESS |
3852 | static struct sk_buff * | |
3853 | sch_handle_egress(struct sk_buff *skb, int *ret, struct net_device *dev) | |
3854 | { | |
46209401 | 3855 | struct mini_Qdisc *miniq = rcu_dereference_bh(dev->miniq_egress); |
1f211a1b DB |
3856 | struct tcf_result cl_res; |
3857 | ||
46209401 | 3858 | if (!miniq) |
1f211a1b DB |
3859 | return skb; |
3860 | ||
8dc07fdb | 3861 | /* qdisc_skb_cb(skb)->pkt_len was already set by the caller. */ |
aadaca9e | 3862 | qdisc_skb_cb(skb)->mru = 0; |
46209401 | 3863 | mini_qdisc_bstats_cpu_update(miniq, skb); |
1f211a1b | 3864 | |
46209401 | 3865 | switch (tcf_classify(skb, miniq->filter_list, &cl_res, false)) { |
1f211a1b DB |
3866 | case TC_ACT_OK: |
3867 | case TC_ACT_RECLASSIFY: | |
3868 | skb->tc_index = TC_H_MIN(cl_res.classid); | |
3869 | break; | |
3870 | case TC_ACT_SHOT: | |
46209401 | 3871 | mini_qdisc_qstats_cpu_drop(miniq); |
1f211a1b | 3872 | *ret = NET_XMIT_DROP; |
7e2c3aea DB |
3873 | kfree_skb(skb); |
3874 | return NULL; | |
1f211a1b DB |
3875 | case TC_ACT_STOLEN: |
3876 | case TC_ACT_QUEUED: | |
e25ea21f | 3877 | case TC_ACT_TRAP: |
1f211a1b | 3878 | *ret = NET_XMIT_SUCCESS; |
7e2c3aea | 3879 | consume_skb(skb); |
1f211a1b DB |
3880 | return NULL; |
3881 | case TC_ACT_REDIRECT: | |
3882 | /* No need to push/pop skb's mac_header here on egress! */ | |
3883 | skb_do_redirect(skb); | |
3884 | *ret = NET_XMIT_SUCCESS; | |
3885 | return NULL; | |
3886 | default: | |
3887 | break; | |
3888 | } | |
357b6cc5 | 3889 | |
1f211a1b DB |
3890 | return skb; |
3891 | } | |
3892 | #endif /* CONFIG_NET_EGRESS */ | |
3893 | ||
fc9bab24 AN |
3894 | #ifdef CONFIG_XPS |
3895 | static int __get_xps_queue_idx(struct net_device *dev, struct sk_buff *skb, | |
3896 | struct xps_dev_maps *dev_maps, unsigned int tci) | |
3897 | { | |
3898 | struct xps_map *map; | |
3899 | int queue_index = -1; | |
3900 | ||
3901 | if (dev->num_tc) { | |
3902 | tci *= dev->num_tc; | |
3903 | tci += netdev_get_prio_tc_map(dev, skb->priority); | |
3904 | } | |
3905 | ||
3906 | map = rcu_dereference(dev_maps->attr_map[tci]); | |
3907 | if (map) { | |
3908 | if (map->len == 1) | |
3909 | queue_index = map->queues[0]; | |
3910 | else | |
3911 | queue_index = map->queues[reciprocal_scale( | |
3912 | skb_get_hash(skb), map->len)]; | |
3913 | if (unlikely(queue_index >= dev->real_num_tx_queues)) | |
3914 | queue_index = -1; | |
3915 | } | |
3916 | return queue_index; | |
3917 | } | |
3918 | #endif | |
3919 | ||
eadec877 AD |
3920 | static int get_xps_queue(struct net_device *dev, struct net_device *sb_dev, |
3921 | struct sk_buff *skb) | |
638b2a69 JP |
3922 | { |
3923 | #ifdef CONFIG_XPS | |
3924 | struct xps_dev_maps *dev_maps; | |
fc9bab24 | 3925 | struct sock *sk = skb->sk; |
638b2a69 JP |
3926 | int queue_index = -1; |
3927 | ||
04157469 AN |
3928 | if (!static_key_false(&xps_needed)) |
3929 | return -1; | |
3930 | ||
638b2a69 | 3931 | rcu_read_lock(); |
fc9bab24 AN |
3932 | if (!static_key_false(&xps_rxqs_needed)) |
3933 | goto get_cpus_map; | |
3934 | ||
eadec877 | 3935 | dev_maps = rcu_dereference(sb_dev->xps_rxqs_map); |
638b2a69 | 3936 | if (dev_maps) { |
fc9bab24 | 3937 | int tci = sk_rx_queue_get(sk); |
184c449f | 3938 | |
fc9bab24 AN |
3939 | if (tci >= 0 && tci < dev->num_rx_queues) |
3940 | queue_index = __get_xps_queue_idx(dev, skb, dev_maps, | |
3941 | tci); | |
3942 | } | |
184c449f | 3943 | |
fc9bab24 AN |
3944 | get_cpus_map: |
3945 | if (queue_index < 0) { | |
eadec877 | 3946 | dev_maps = rcu_dereference(sb_dev->xps_cpus_map); |
fc9bab24 AN |
3947 | if (dev_maps) { |
3948 | unsigned int tci = skb->sender_cpu - 1; | |
3949 | ||
3950 | queue_index = __get_xps_queue_idx(dev, skb, dev_maps, | |
3951 | tci); | |
638b2a69 JP |
3952 | } |
3953 | } | |
3954 | rcu_read_unlock(); | |
3955 | ||
3956 | return queue_index; | |
3957 | #else | |
3958 | return -1; | |
3959 | #endif | |
3960 | } | |
3961 | ||
a4ea8a3d | 3962 | u16 dev_pick_tx_zero(struct net_device *dev, struct sk_buff *skb, |
a350ecce | 3963 | struct net_device *sb_dev) |
a4ea8a3d AD |
3964 | { |
3965 | return 0; | |
3966 | } | |
3967 | EXPORT_SYMBOL(dev_pick_tx_zero); | |
3968 | ||
3969 | u16 dev_pick_tx_cpu_id(struct net_device *dev, struct sk_buff *skb, | |
a350ecce | 3970 | struct net_device *sb_dev) |
a4ea8a3d AD |
3971 | { |
3972 | return (u16)raw_smp_processor_id() % dev->real_num_tx_queues; | |
3973 | } | |
3974 | EXPORT_SYMBOL(dev_pick_tx_cpu_id); | |
3975 | ||
b71b5837 PA |
3976 | u16 netdev_pick_tx(struct net_device *dev, struct sk_buff *skb, |
3977 | struct net_device *sb_dev) | |
638b2a69 JP |
3978 | { |
3979 | struct sock *sk = skb->sk; | |
3980 | int queue_index = sk_tx_queue_get(sk); | |
3981 | ||
eadec877 AD |
3982 | sb_dev = sb_dev ? : dev; |
3983 | ||
638b2a69 JP |
3984 | if (queue_index < 0 || skb->ooo_okay || |
3985 | queue_index >= dev->real_num_tx_queues) { | |
eadec877 | 3986 | int new_index = get_xps_queue(dev, sb_dev, skb); |
f4563a75 | 3987 | |
638b2a69 | 3988 | if (new_index < 0) |
eadec877 | 3989 | new_index = skb_tx_hash(dev, sb_dev, skb); |
638b2a69 JP |
3990 | |
3991 | if (queue_index != new_index && sk && | |
004a5d01 | 3992 | sk_fullsock(sk) && |
638b2a69 JP |
3993 | rcu_access_pointer(sk->sk_dst_cache)) |
3994 | sk_tx_queue_set(sk, new_index); | |
3995 | ||
3996 | queue_index = new_index; | |
3997 | } | |
3998 | ||
3999 | return queue_index; | |
4000 | } | |
b71b5837 | 4001 | EXPORT_SYMBOL(netdev_pick_tx); |
638b2a69 | 4002 | |
4bd97d51 PA |
4003 | struct netdev_queue *netdev_core_pick_tx(struct net_device *dev, |
4004 | struct sk_buff *skb, | |
4005 | struct net_device *sb_dev) | |
638b2a69 JP |
4006 | { |
4007 | int queue_index = 0; | |
4008 | ||
4009 | #ifdef CONFIG_XPS | |
52bd2d62 ED |
4010 | u32 sender_cpu = skb->sender_cpu - 1; |
4011 | ||
4012 | if (sender_cpu >= (u32)NR_CPUS) | |
638b2a69 JP |
4013 | skb->sender_cpu = raw_smp_processor_id() + 1; |
4014 | #endif | |
4015 | ||
4016 | if (dev->real_num_tx_queues != 1) { | |
4017 | const struct net_device_ops *ops = dev->netdev_ops; | |
f4563a75 | 4018 | |
638b2a69 | 4019 | if (ops->ndo_select_queue) |
a350ecce | 4020 | queue_index = ops->ndo_select_queue(dev, skb, sb_dev); |
638b2a69 | 4021 | else |
4bd97d51 | 4022 | queue_index = netdev_pick_tx(dev, skb, sb_dev); |
638b2a69 | 4023 | |
d584527c | 4024 | queue_index = netdev_cap_txqueue(dev, queue_index); |
638b2a69 JP |
4025 | } |
4026 | ||
4027 | skb_set_queue_mapping(skb, queue_index); | |
4028 | return netdev_get_tx_queue(dev, queue_index); | |
4029 | } | |
4030 | ||
d29f749e | 4031 | /** |
9d08dd3d | 4032 | * __dev_queue_xmit - transmit a buffer |
d29f749e | 4033 | * @skb: buffer to transmit |
eadec877 | 4034 | * @sb_dev: suboordinate device used for L2 forwarding offload |
d29f749e DJ |
4035 | * |
4036 | * Queue a buffer for transmission to a network device. The caller must | |
4037 | * have set the device and priority and built the buffer before calling | |
4038 | * this function. The function can be called from an interrupt. | |
4039 | * | |
4040 | * A negative errno code is returned on a failure. A success does not | |
4041 | * guarantee the frame will be transmitted as it may be dropped due | |
4042 | * to congestion or traffic shaping. | |
4043 | * | |
4044 | * ----------------------------------------------------------------------------------- | |
4045 | * I notice this method can also return errors from the queue disciplines, | |
4046 | * including NET_XMIT_DROP, which is a positive value. So, errors can also | |
4047 | * be positive. | |
4048 | * | |
4049 | * Regardless of the return value, the skb is consumed, so it is currently | |
4050 | * difficult to retry a send to this method. (You can bump the ref count | |
4051 | * before sending to hold a reference for retry if you are careful.) | |
4052 | * | |
4053 | * When calling this method, interrupts MUST be enabled. This is because | |
4054 | * the BH enable code must have IRQs enabled so that it will not deadlock. | |
4055 | * --BLG | |
4056 | */ | |
eadec877 | 4057 | static int __dev_queue_xmit(struct sk_buff *skb, struct net_device *sb_dev) |
1da177e4 LT |
4058 | { |
4059 | struct net_device *dev = skb->dev; | |
dc2b4847 | 4060 | struct netdev_queue *txq; |
1da177e4 LT |
4061 | struct Qdisc *q; |
4062 | int rc = -ENOMEM; | |
f53c7239 | 4063 | bool again = false; |
1da177e4 | 4064 | |
6d1ccff6 ED |
4065 | skb_reset_mac_header(skb); |
4066 | ||
e7fd2885 WB |
4067 | if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_SCHED_TSTAMP)) |
4068 | __skb_tstamp_tx(skb, NULL, skb->sk, SCM_TSTAMP_SCHED); | |
4069 | ||
4ec93edb YH |
4070 | /* Disable soft irqs for various locks below. Also |
4071 | * stops preemption for RCU. | |
1da177e4 | 4072 | */ |
4ec93edb | 4073 | rcu_read_lock_bh(); |
1da177e4 | 4074 | |
5bc1421e NH |
4075 | skb_update_prio(skb); |
4076 | ||
1f211a1b DB |
4077 | qdisc_pkt_len_init(skb); |
4078 | #ifdef CONFIG_NET_CLS_ACT | |
8dc07fdb | 4079 | skb->tc_at_ingress = 0; |
357b6cc5 | 4080 | # ifdef CONFIG_NET_EGRESS |
aabf6772 | 4081 | if (static_branch_unlikely(&egress_needed_key)) { |
1f211a1b DB |
4082 | skb = sch_handle_egress(skb, &rc, dev); |
4083 | if (!skb) | |
4084 | goto out; | |
4085 | } | |
357b6cc5 | 4086 | # endif |
1f211a1b | 4087 | #endif |
02875878 ED |
4088 | /* If device/qdisc don't need skb->dst, release it right now while |
4089 | * its hot in this cpu cache. | |
4090 | */ | |
4091 | if (dev->priv_flags & IFF_XMIT_DST_RELEASE) | |
4092 | skb_dst_drop(skb); | |
4093 | else | |
4094 | skb_dst_force(skb); | |
4095 | ||
4bd97d51 | 4096 | txq = netdev_core_pick_tx(dev, skb, sb_dev); |
a898def2 | 4097 | q = rcu_dereference_bh(txq->qdisc); |
37437bb2 | 4098 | |
cf66ba58 | 4099 | trace_net_dev_queue(skb); |
1da177e4 | 4100 | if (q->enqueue) { |
bbd8a0d3 | 4101 | rc = __dev_xmit_skb(skb, q, dev, txq); |
37437bb2 | 4102 | goto out; |
1da177e4 LT |
4103 | } |
4104 | ||
4105 | /* The device has no queue. Common case for software devices: | |
eb13da1a | 4106 | * loopback, all the sorts of tunnels... |
1da177e4 | 4107 | |
eb13da1a | 4108 | * Really, it is unlikely that netif_tx_lock protection is necessary |
4109 | * here. (f.e. loopback and IP tunnels are clean ignoring statistics | |
4110 | * counters.) | |
4111 | * However, it is possible, that they rely on protection | |
4112 | * made by us here. | |
1da177e4 | 4113 | |
eb13da1a | 4114 | * Check this and shot the lock. It is not prone from deadlocks. |
4115 | *Either shot noqueue qdisc, it is even simpler 8) | |
1da177e4 LT |
4116 | */ |
4117 | if (dev->flags & IFF_UP) { | |
4118 | int cpu = smp_processor_id(); /* ok because BHs are off */ | |
4119 | ||
c773e847 | 4120 | if (txq->xmit_lock_owner != cpu) { |
97cdcf37 | 4121 | if (dev_xmit_recursion()) |
745e20f1 ED |
4122 | goto recursion_alert; |
4123 | ||
f53c7239 | 4124 | skb = validate_xmit_skb(skb, dev, &again); |
1f59533f | 4125 | if (!skb) |
d21fd63e | 4126 | goto out; |
1f59533f | 4127 | |
3744741a | 4128 | PRANDOM_ADD_NOISE(skb, dev, txq, jiffies); |
c773e847 | 4129 | HARD_TX_LOCK(dev, txq, cpu); |
1da177e4 | 4130 | |
73466498 | 4131 | if (!netif_xmit_stopped(txq)) { |
97cdcf37 | 4132 | dev_xmit_recursion_inc(); |
ce93718f | 4133 | skb = dev_hard_start_xmit(skb, dev, txq, &rc); |
97cdcf37 | 4134 | dev_xmit_recursion_dec(); |
572a9d7b | 4135 | if (dev_xmit_complete(rc)) { |
c773e847 | 4136 | HARD_TX_UNLOCK(dev, txq); |
1da177e4 LT |
4137 | goto out; |
4138 | } | |
4139 | } | |
c773e847 | 4140 | HARD_TX_UNLOCK(dev, txq); |
e87cc472 JP |
4141 | net_crit_ratelimited("Virtual device %s asks to queue packet!\n", |
4142 | dev->name); | |
1da177e4 LT |
4143 | } else { |
4144 | /* Recursion is detected! It is possible, | |
745e20f1 ED |
4145 | * unfortunately |
4146 | */ | |
4147 | recursion_alert: | |
e87cc472 JP |
4148 | net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n", |
4149 | dev->name); | |
1da177e4 LT |
4150 | } |
4151 | } | |
4152 | ||
4153 | rc = -ENETDOWN; | |
d4828d85 | 4154 | rcu_read_unlock_bh(); |
1da177e4 | 4155 | |
015f0688 | 4156 | atomic_long_inc(&dev->tx_dropped); |
1f59533f | 4157 | kfree_skb_list(skb); |
1da177e4 LT |
4158 | return rc; |
4159 | out: | |
d4828d85 | 4160 | rcu_read_unlock_bh(); |
1da177e4 LT |
4161 | return rc; |
4162 | } | |
f663dd9a | 4163 | |
2b4aa3ce | 4164 | int dev_queue_xmit(struct sk_buff *skb) |
f663dd9a JW |
4165 | { |
4166 | return __dev_queue_xmit(skb, NULL); | |
4167 | } | |
2b4aa3ce | 4168 | EXPORT_SYMBOL(dev_queue_xmit); |
1da177e4 | 4169 | |
eadec877 | 4170 | int dev_queue_xmit_accel(struct sk_buff *skb, struct net_device *sb_dev) |
f663dd9a | 4171 | { |
eadec877 | 4172 | return __dev_queue_xmit(skb, sb_dev); |
f663dd9a JW |
4173 | } |
4174 | EXPORT_SYMBOL(dev_queue_xmit_accel); | |
4175 | ||
36ccdf85 | 4176 | int __dev_direct_xmit(struct sk_buff *skb, u16 queue_id) |
865b03f2 MK |
4177 | { |
4178 | struct net_device *dev = skb->dev; | |
4179 | struct sk_buff *orig_skb = skb; | |
4180 | struct netdev_queue *txq; | |
4181 | int ret = NETDEV_TX_BUSY; | |
4182 | bool again = false; | |
4183 | ||
4184 | if (unlikely(!netif_running(dev) || | |
4185 | !netif_carrier_ok(dev))) | |
4186 | goto drop; | |
4187 | ||
4188 | skb = validate_xmit_skb_list(skb, dev, &again); | |
4189 | if (skb != orig_skb) | |
4190 | goto drop; | |
4191 | ||
4192 | skb_set_queue_mapping(skb, queue_id); | |
4193 | txq = skb_get_tx_queue(dev, skb); | |
3744741a | 4194 | PRANDOM_ADD_NOISE(skb, dev, txq, jiffies); |
865b03f2 MK |
4195 | |
4196 | local_bh_disable(); | |
4197 | ||
0ad6f6e7 | 4198 | dev_xmit_recursion_inc(); |
865b03f2 MK |
4199 | HARD_TX_LOCK(dev, txq, smp_processor_id()); |
4200 | if (!netif_xmit_frozen_or_drv_stopped(txq)) | |
4201 | ret = netdev_start_xmit(skb, dev, txq, false); | |
4202 | HARD_TX_UNLOCK(dev, txq); | |
0ad6f6e7 | 4203 | dev_xmit_recursion_dec(); |
865b03f2 MK |
4204 | |
4205 | local_bh_enable(); | |
865b03f2 MK |
4206 | return ret; |
4207 | drop: | |
4208 | atomic_long_inc(&dev->tx_dropped); | |
4209 | kfree_skb_list(skb); | |
4210 | return NET_XMIT_DROP; | |
4211 | } | |
36ccdf85 | 4212 | EXPORT_SYMBOL(__dev_direct_xmit); |
1da177e4 | 4213 | |
eb13da1a | 4214 | /************************************************************************* |
4215 | * Receiver routines | |
4216 | *************************************************************************/ | |
1da177e4 | 4217 | |
6b2bedc3 | 4218 | int netdev_max_backlog __read_mostly = 1000; |
c9e6bc64 ED |
4219 | EXPORT_SYMBOL(netdev_max_backlog); |
4220 | ||
3b098e2d | 4221 | int netdev_tstamp_prequeue __read_mostly = 1; |
6b2bedc3 | 4222 | int netdev_budget __read_mostly = 300; |
a4837980 KK |
4223 | /* Must be at least 2 jiffes to guarantee 1 jiffy timeout */ |
4224 | unsigned int __read_mostly netdev_budget_usecs = 2 * USEC_PER_SEC / HZ; | |
3d48b53f MT |
4225 | int weight_p __read_mostly = 64; /* old backlog weight */ |
4226 | int dev_weight_rx_bias __read_mostly = 1; /* bias for backlog weight */ | |
4227 | int dev_weight_tx_bias __read_mostly = 1; /* bias for output_queue quota */ | |
4228 | int dev_rx_weight __read_mostly = 64; | |
4229 | int dev_tx_weight __read_mostly = 64; | |
323ebb61 EC |
4230 | /* Maximum number of GRO_NORMAL skbs to batch up for list-RX */ |
4231 | int gro_normal_batch __read_mostly = 8; | |
1da177e4 | 4232 | |
eecfd7c4 ED |
4233 | /* Called with irq disabled */ |
4234 | static inline void ____napi_schedule(struct softnet_data *sd, | |
4235 | struct napi_struct *napi) | |
4236 | { | |
4237 | list_add_tail(&napi->poll_list, &sd->poll_list); | |
4238 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); | |
4239 | } | |
4240 | ||
bfb564e7 KK |
4241 | #ifdef CONFIG_RPS |
4242 | ||
4243 | /* One global table that all flow-based protocols share. */ | |
6e3f7faf | 4244 | struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly; |
bfb564e7 | 4245 | EXPORT_SYMBOL(rps_sock_flow_table); |
567e4b79 ED |
4246 | u32 rps_cpu_mask __read_mostly; |
4247 | EXPORT_SYMBOL(rps_cpu_mask); | |
bfb564e7 | 4248 | |
dc05360f | 4249 | struct static_key_false rps_needed __read_mostly; |
3df97ba8 | 4250 | EXPORT_SYMBOL(rps_needed); |
dc05360f | 4251 | struct static_key_false rfs_needed __read_mostly; |
13bfff25 | 4252 | EXPORT_SYMBOL(rfs_needed); |
adc9300e | 4253 | |
c445477d BH |
4254 | static struct rps_dev_flow * |
4255 | set_rps_cpu(struct net_device *dev, struct sk_buff *skb, | |
4256 | struct rps_dev_flow *rflow, u16 next_cpu) | |
4257 | { | |
a31196b0 | 4258 | if (next_cpu < nr_cpu_ids) { |
c445477d BH |
4259 | #ifdef CONFIG_RFS_ACCEL |
4260 | struct netdev_rx_queue *rxqueue; | |
4261 | struct rps_dev_flow_table *flow_table; | |
4262 | struct rps_dev_flow *old_rflow; | |
4263 | u32 flow_id; | |
4264 | u16 rxq_index; | |
4265 | int rc; | |
4266 | ||
4267 | /* Should we steer this flow to a different hardware queue? */ | |
69a19ee6 BH |
4268 | if (!skb_rx_queue_recorded(skb) || !dev->rx_cpu_rmap || |
4269 | !(dev->features & NETIF_F_NTUPLE)) | |
c445477d BH |
4270 | goto out; |
4271 | rxq_index = cpu_rmap_lookup_index(dev->rx_cpu_rmap, next_cpu); | |
4272 | if (rxq_index == skb_get_rx_queue(skb)) | |
4273 | goto out; | |
4274 | ||
4275 | rxqueue = dev->_rx + rxq_index; | |
4276 | flow_table = rcu_dereference(rxqueue->rps_flow_table); | |
4277 | if (!flow_table) | |
4278 | goto out; | |
61b905da | 4279 | flow_id = skb_get_hash(skb) & flow_table->mask; |
c445477d BH |
4280 | rc = dev->netdev_ops->ndo_rx_flow_steer(dev, skb, |
4281 | rxq_index, flow_id); | |
4282 | if (rc < 0) | |
4283 | goto out; | |
4284 | old_rflow = rflow; | |
4285 | rflow = &flow_table->flows[flow_id]; | |
c445477d BH |
4286 | rflow->filter = rc; |
4287 | if (old_rflow->filter == rflow->filter) | |
4288 | old_rflow->filter = RPS_NO_FILTER; | |
4289 | out: | |
4290 | #endif | |
4291 | rflow->last_qtail = | |
09994d1b | 4292 | per_cpu(softnet_data, next_cpu).input_queue_head; |
c445477d BH |
4293 | } |
4294 | ||
09994d1b | 4295 | rflow->cpu = next_cpu; |
c445477d BH |
4296 | return rflow; |
4297 | } | |
4298 | ||
bfb564e7 KK |
4299 | /* |
4300 | * get_rps_cpu is called from netif_receive_skb and returns the target | |
4301 | * CPU from the RPS map of the receiving queue for a given skb. | |
4302 | * rcu_read_lock must be held on entry. | |
4303 | */ | |
4304 | static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb, | |
4305 | struct rps_dev_flow **rflowp) | |
4306 | { | |
567e4b79 ED |
4307 | const struct rps_sock_flow_table *sock_flow_table; |
4308 | struct netdev_rx_queue *rxqueue = dev->_rx; | |
bfb564e7 | 4309 | struct rps_dev_flow_table *flow_table; |
567e4b79 | 4310 | struct rps_map *map; |
bfb564e7 | 4311 | int cpu = -1; |
567e4b79 | 4312 | u32 tcpu; |
61b905da | 4313 | u32 hash; |
bfb564e7 KK |
4314 | |
4315 | if (skb_rx_queue_recorded(skb)) { | |
4316 | u16 index = skb_get_rx_queue(skb); | |
567e4b79 | 4317 | |
62fe0b40 BH |
4318 | if (unlikely(index >= dev->real_num_rx_queues)) { |
4319 | WARN_ONCE(dev->real_num_rx_queues > 1, | |
4320 | "%s received packet on queue %u, but number " | |
4321 | "of RX queues is %u\n", | |
4322 | dev->name, index, dev->real_num_rx_queues); | |
bfb564e7 KK |
4323 | goto done; |
4324 | } | |
567e4b79 ED |
4325 | rxqueue += index; |
4326 | } | |
bfb564e7 | 4327 | |
567e4b79 ED |
4328 | /* Avoid computing hash if RFS/RPS is not active for this rxqueue */ |
4329 | ||
4330 | flow_table = rcu_dereference(rxqueue->rps_flow_table); | |
6e3f7faf | 4331 | map = rcu_dereference(rxqueue->rps_map); |
567e4b79 | 4332 | if (!flow_table && !map) |
bfb564e7 KK |
4333 | goto done; |
4334 | ||
2d47b459 | 4335 | skb_reset_network_header(skb); |
61b905da TH |
4336 | hash = skb_get_hash(skb); |
4337 | if (!hash) | |
bfb564e7 KK |
4338 | goto done; |
4339 | ||
fec5e652 TH |
4340 | sock_flow_table = rcu_dereference(rps_sock_flow_table); |
4341 | if (flow_table && sock_flow_table) { | |
fec5e652 | 4342 | struct rps_dev_flow *rflow; |
567e4b79 ED |
4343 | u32 next_cpu; |
4344 | u32 ident; | |
4345 | ||
4346 | /* First check into global flow table if there is a match */ | |
4347 | ident = sock_flow_table->ents[hash & sock_flow_table->mask]; | |
4348 | if ((ident ^ hash) & ~rps_cpu_mask) | |
4349 | goto try_rps; | |
fec5e652 | 4350 | |
567e4b79 ED |
4351 | next_cpu = ident & rps_cpu_mask; |
4352 | ||
4353 | /* OK, now we know there is a match, | |
4354 | * we can look at the local (per receive queue) flow table | |
4355 | */ | |
61b905da | 4356 | rflow = &flow_table->flows[hash & flow_table->mask]; |
fec5e652 TH |
4357 | tcpu = rflow->cpu; |
4358 | ||
fec5e652 TH |
4359 | /* |
4360 | * If the desired CPU (where last recvmsg was done) is | |
4361 | * different from current CPU (one in the rx-queue flow | |
4362 | * table entry), switch if one of the following holds: | |
a31196b0 | 4363 | * - Current CPU is unset (>= nr_cpu_ids). |
fec5e652 TH |
4364 | * - Current CPU is offline. |
4365 | * - The current CPU's queue tail has advanced beyond the | |
4366 | * last packet that was enqueued using this table entry. | |
4367 | * This guarantees that all previous packets for the flow | |
4368 | * have been dequeued, thus preserving in order delivery. | |
4369 | */ | |
4370 | if (unlikely(tcpu != next_cpu) && | |
a31196b0 | 4371 | (tcpu >= nr_cpu_ids || !cpu_online(tcpu) || |
fec5e652 | 4372 | ((int)(per_cpu(softnet_data, tcpu).input_queue_head - |
baefa31d TH |
4373 | rflow->last_qtail)) >= 0)) { |
4374 | tcpu = next_cpu; | |
c445477d | 4375 | rflow = set_rps_cpu(dev, skb, rflow, next_cpu); |
baefa31d | 4376 | } |
c445477d | 4377 | |
a31196b0 | 4378 | if (tcpu < nr_cpu_ids && cpu_online(tcpu)) { |
fec5e652 TH |
4379 | *rflowp = rflow; |
4380 | cpu = tcpu; | |
4381 | goto done; | |
4382 | } | |
4383 | } | |
4384 | ||
567e4b79 ED |
4385 | try_rps: |
4386 | ||
0a9627f2 | 4387 | if (map) { |
8fc54f68 | 4388 | tcpu = map->cpus[reciprocal_scale(hash, map->len)]; |
0a9627f2 TH |
4389 | if (cpu_online(tcpu)) { |
4390 | cpu = tcpu; | |
4391 | goto done; | |
4392 | } | |
4393 | } | |
4394 | ||
4395 | done: | |
0a9627f2 TH |
4396 | return cpu; |
4397 | } | |
4398 | ||
c445477d BH |
4399 | #ifdef CONFIG_RFS_ACCEL |
4400 | ||
4401 | /** | |
4402 | * rps_may_expire_flow - check whether an RFS hardware filter may be removed | |
4403 | * @dev: Device on which the filter was set | |
4404 | * @rxq_index: RX queue index | |
4405 | * @flow_id: Flow ID passed to ndo_rx_flow_steer() | |
4406 | * @filter_id: Filter ID returned by ndo_rx_flow_steer() | |
4407 | * | |
4408 | * Drivers that implement ndo_rx_flow_steer() should periodically call | |
4409 | * this function for each installed filter and remove the filters for | |
4410 | * which it returns %true. | |
4411 | */ | |
4412 | bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index, | |
4413 | u32 flow_id, u16 filter_id) | |
4414 | { | |
4415 | struct netdev_rx_queue *rxqueue = dev->_rx + rxq_index; | |
4416 | struct rps_dev_flow_table *flow_table; | |
4417 | struct rps_dev_flow *rflow; | |
4418 | bool expire = true; | |
a31196b0 | 4419 | unsigned int cpu; |
c445477d BH |
4420 | |
4421 | rcu_read_lock(); | |
4422 | flow_table = rcu_dereference(rxqueue->rps_flow_table); | |
4423 | if (flow_table && flow_id <= flow_table->mask) { | |
4424 | rflow = &flow_table->flows[flow_id]; | |
6aa7de05 | 4425 | cpu = READ_ONCE(rflow->cpu); |
a31196b0 | 4426 | if (rflow->filter == filter_id && cpu < nr_cpu_ids && |
c445477d BH |
4427 | ((int)(per_cpu(softnet_data, cpu).input_queue_head - |
4428 | rflow->last_qtail) < | |
4429 | (int)(10 * flow_table->mask))) | |
4430 | expire = false; | |
4431 | } | |
4432 | rcu_read_unlock(); | |
4433 | return expire; | |
4434 | } | |
4435 | EXPORT_SYMBOL(rps_may_expire_flow); | |
4436 | ||
4437 | #endif /* CONFIG_RFS_ACCEL */ | |
4438 | ||
0a9627f2 | 4439 | /* Called from hardirq (IPI) context */ |
e36fa2f7 | 4440 | static void rps_trigger_softirq(void *data) |
0a9627f2 | 4441 | { |
e36fa2f7 ED |
4442 | struct softnet_data *sd = data; |
4443 | ||
eecfd7c4 | 4444 | ____napi_schedule(sd, &sd->backlog); |
dee42870 | 4445 | sd->received_rps++; |
0a9627f2 | 4446 | } |
e36fa2f7 | 4447 | |
fec5e652 | 4448 | #endif /* CONFIG_RPS */ |
0a9627f2 | 4449 | |
e36fa2f7 ED |
4450 | /* |
4451 | * Check if this softnet_data structure is another cpu one | |
4452 | * If yes, queue it to our IPI list and return 1 | |
4453 | * If no, return 0 | |
4454 | */ | |
4455 | static int rps_ipi_queued(struct softnet_data *sd) | |
4456 | { | |
4457 | #ifdef CONFIG_RPS | |
903ceff7 | 4458 | struct softnet_data *mysd = this_cpu_ptr(&softnet_data); |
e36fa2f7 ED |
4459 | |
4460 | if (sd != mysd) { | |
4461 | sd->rps_ipi_next = mysd->rps_ipi_list; | |
4462 | mysd->rps_ipi_list = sd; | |
4463 | ||
4464 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); | |
4465 | return 1; | |
4466 | } | |
4467 | #endif /* CONFIG_RPS */ | |
4468 | return 0; | |
4469 | } | |
4470 | ||
99bbc707 WB |
4471 | #ifdef CONFIG_NET_FLOW_LIMIT |
4472 | int netdev_flow_limit_table_len __read_mostly = (1 << 12); | |
4473 | #endif | |
4474 | ||
4475 | static bool skb_flow_limit(struct sk_buff *skb, unsigned int qlen) | |
4476 | { | |
4477 | #ifdef CONFIG_NET_FLOW_LIMIT | |
4478 | struct sd_flow_limit *fl; | |
4479 | struct softnet_data *sd; | |
4480 | unsigned int old_flow, new_flow; | |
4481 | ||
4482 | if (qlen < (netdev_max_backlog >> 1)) | |
4483 | return false; | |
4484 | ||
903ceff7 | 4485 | sd = this_cpu_ptr(&softnet_data); |
99bbc707 WB |
4486 | |
4487 | rcu_read_lock(); | |
4488 | fl = rcu_dereference(sd->flow_limit); | |
4489 | if (fl) { | |
3958afa1 | 4490 | new_flow = skb_get_hash(skb) & (fl->num_buckets - 1); |
99bbc707 WB |
4491 | old_flow = fl->history[fl->history_head]; |
4492 | fl->history[fl->history_head] = new_flow; | |
4493 | ||
4494 | fl->history_head++; | |
4495 | fl->history_head &= FLOW_LIMIT_HISTORY - 1; | |
4496 | ||
4497 | if (likely(fl->buckets[old_flow])) | |
4498 | fl->buckets[old_flow]--; | |
4499 | ||
4500 | if (++fl->buckets[new_flow] > (FLOW_LIMIT_HISTORY >> 1)) { | |
4501 | fl->count++; | |
4502 | rcu_read_unlock(); | |
4503 | return true; | |
4504 | } | |
4505 | } | |
4506 | rcu_read_unlock(); | |
4507 | #endif | |
4508 | return false; | |
4509 | } | |
4510 | ||
0a9627f2 TH |
4511 | /* |
4512 | * enqueue_to_backlog is called to queue an skb to a per CPU backlog | |
4513 | * queue (may be a remote CPU queue). | |
4514 | */ | |
fec5e652 TH |
4515 | static int enqueue_to_backlog(struct sk_buff *skb, int cpu, |
4516 | unsigned int *qtail) | |
0a9627f2 | 4517 | { |
e36fa2f7 | 4518 | struct softnet_data *sd; |
0a9627f2 | 4519 | unsigned long flags; |
99bbc707 | 4520 | unsigned int qlen; |
0a9627f2 | 4521 | |
e36fa2f7 | 4522 | sd = &per_cpu(softnet_data, cpu); |
0a9627f2 TH |
4523 | |
4524 | local_irq_save(flags); | |
0a9627f2 | 4525 | |
e36fa2f7 | 4526 | rps_lock(sd); |
e9e4dd32 JA |
4527 | if (!netif_running(skb->dev)) |
4528 | goto drop; | |
99bbc707 WB |
4529 | qlen = skb_queue_len(&sd->input_pkt_queue); |
4530 | if (qlen <= netdev_max_backlog && !skb_flow_limit(skb, qlen)) { | |
e008f3f0 | 4531 | if (qlen) { |
0a9627f2 | 4532 | enqueue: |
e36fa2f7 | 4533 | __skb_queue_tail(&sd->input_pkt_queue, skb); |
76cc8b13 | 4534 | input_queue_tail_incr_save(sd, qtail); |
e36fa2f7 | 4535 | rps_unlock(sd); |
152102c7 | 4536 | local_irq_restore(flags); |
0a9627f2 TH |
4537 | return NET_RX_SUCCESS; |
4538 | } | |
4539 | ||
ebda37c2 ED |
4540 | /* Schedule NAPI for backlog device |
4541 | * We can use non atomic operation since we own the queue lock | |
4542 | */ | |
4543 | if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) { | |
e36fa2f7 | 4544 | if (!rps_ipi_queued(sd)) |
eecfd7c4 | 4545 | ____napi_schedule(sd, &sd->backlog); |
0a9627f2 TH |
4546 | } |
4547 | goto enqueue; | |
4548 | } | |
4549 | ||
e9e4dd32 | 4550 | drop: |
dee42870 | 4551 | sd->dropped++; |
e36fa2f7 | 4552 | rps_unlock(sd); |
0a9627f2 | 4553 | |
0a9627f2 TH |
4554 | local_irq_restore(flags); |
4555 | ||
caf586e5 | 4556 | atomic_long_inc(&skb->dev->rx_dropped); |
0a9627f2 TH |
4557 | kfree_skb(skb); |
4558 | return NET_RX_DROP; | |
4559 | } | |
1da177e4 | 4560 | |
e817f856 JDB |
4561 | static struct netdev_rx_queue *netif_get_rxqueue(struct sk_buff *skb) |
4562 | { | |
4563 | struct net_device *dev = skb->dev; | |
4564 | struct netdev_rx_queue *rxqueue; | |
4565 | ||
4566 | rxqueue = dev->_rx; | |
4567 | ||
4568 | if (skb_rx_queue_recorded(skb)) { | |
4569 | u16 index = skb_get_rx_queue(skb); | |
4570 | ||
4571 | if (unlikely(index >= dev->real_num_rx_queues)) { | |
4572 | WARN_ONCE(dev->real_num_rx_queues > 1, | |
4573 | "%s received packet on queue %u, but number " | |
4574 | "of RX queues is %u\n", | |
4575 | dev->name, index, dev->real_num_rx_queues); | |
4576 | ||
4577 | return rxqueue; /* Return first rxqueue */ | |
4578 | } | |
4579 | rxqueue += index; | |
4580 | } | |
4581 | return rxqueue; | |
4582 | } | |
4583 | ||
d4455169 | 4584 | static u32 netif_receive_generic_xdp(struct sk_buff *skb, |
02671e23 | 4585 | struct xdp_buff *xdp, |
d4455169 JF |
4586 | struct bpf_prog *xdp_prog) |
4587 | { | |
e817f856 | 4588 | struct netdev_rx_queue *rxqueue; |
198d83bb | 4589 | void *orig_data, *orig_data_end; |
de8f3a83 | 4590 | u32 metalen, act = XDP_DROP; |
29724956 JDB |
4591 | __be16 orig_eth_type; |
4592 | struct ethhdr *eth; | |
4593 | bool orig_bcast; | |
d4455169 JF |
4594 | int hlen, off; |
4595 | u32 mac_len; | |
4596 | ||
4597 | /* Reinjected packets coming from act_mirred or similar should | |
4598 | * not get XDP generic processing. | |
4599 | */ | |
2c64605b | 4600 | if (skb_is_redirected(skb)) |
d4455169 JF |
4601 | return XDP_PASS; |
4602 | ||
de8f3a83 DB |
4603 | /* XDP packets must be linear and must have sufficient headroom |
4604 | * of XDP_PACKET_HEADROOM bytes. This is the guarantee that also | |
4605 | * native XDP provides, thus we need to do it here as well. | |
4606 | */ | |
ad1e03b2 | 4607 | if (skb_cloned(skb) || skb_is_nonlinear(skb) || |
de8f3a83 DB |
4608 | skb_headroom(skb) < XDP_PACKET_HEADROOM) { |
4609 | int hroom = XDP_PACKET_HEADROOM - skb_headroom(skb); | |
4610 | int troom = skb->tail + skb->data_len - skb->end; | |
4611 | ||
4612 | /* In case we have to go down the path and also linearize, | |
4613 | * then lets do the pskb_expand_head() work just once here. | |
4614 | */ | |
4615 | if (pskb_expand_head(skb, | |
4616 | hroom > 0 ? ALIGN(hroom, NET_SKB_PAD) : 0, | |
4617 | troom > 0 ? troom + 128 : 0, GFP_ATOMIC)) | |
4618 | goto do_drop; | |
2d17d8d7 | 4619 | if (skb_linearize(skb)) |
de8f3a83 DB |
4620 | goto do_drop; |
4621 | } | |
d4455169 JF |
4622 | |
4623 | /* The XDP program wants to see the packet starting at the MAC | |
4624 | * header. | |
4625 | */ | |
4626 | mac_len = skb->data - skb_mac_header(skb); | |
4627 | hlen = skb_headlen(skb) + mac_len; | |
02671e23 BT |
4628 | xdp->data = skb->data - mac_len; |
4629 | xdp->data_meta = xdp->data; | |
4630 | xdp->data_end = xdp->data + hlen; | |
4631 | xdp->data_hard_start = skb->data - skb_headroom(skb); | |
a075767b JDB |
4632 | |
4633 | /* SKB "head" area always have tailroom for skb_shared_info */ | |
4634 | xdp->frame_sz = (void *)skb_end_pointer(skb) - xdp->data_hard_start; | |
4635 | xdp->frame_sz += SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); | |
4636 | ||
02671e23 BT |
4637 | orig_data_end = xdp->data_end; |
4638 | orig_data = xdp->data; | |
29724956 JDB |
4639 | eth = (struct ethhdr *)xdp->data; |
4640 | orig_bcast = is_multicast_ether_addr_64bits(eth->h_dest); | |
4641 | orig_eth_type = eth->h_proto; | |
d4455169 | 4642 | |
e817f856 | 4643 | rxqueue = netif_get_rxqueue(skb); |
02671e23 | 4644 | xdp->rxq = &rxqueue->xdp_rxq; |
e817f856 | 4645 | |
02671e23 | 4646 | act = bpf_prog_run_xdp(xdp_prog, xdp); |
d4455169 | 4647 | |
065af355 | 4648 | /* check if bpf_xdp_adjust_head was used */ |
02671e23 | 4649 | off = xdp->data - orig_data; |
065af355 JDB |
4650 | if (off) { |
4651 | if (off > 0) | |
4652 | __skb_pull(skb, off); | |
4653 | else if (off < 0) | |
4654 | __skb_push(skb, -off); | |
4655 | ||
4656 | skb->mac_header += off; | |
4657 | skb_reset_network_header(skb); | |
4658 | } | |
d4455169 | 4659 | |
a075767b JDB |
4660 | /* check if bpf_xdp_adjust_tail was used */ |
4661 | off = xdp->data_end - orig_data_end; | |
f7613120 | 4662 | if (off != 0) { |
02671e23 | 4663 | skb_set_tail_pointer(skb, xdp->data_end - xdp->data); |
a075767b | 4664 | skb->len += off; /* positive on grow, negative on shrink */ |
f7613120 | 4665 | } |
198d83bb | 4666 | |
29724956 JDB |
4667 | /* check if XDP changed eth hdr such SKB needs update */ |
4668 | eth = (struct ethhdr *)xdp->data; | |
4669 | if ((orig_eth_type != eth->h_proto) || | |
4670 | (orig_bcast != is_multicast_ether_addr_64bits(eth->h_dest))) { | |
4671 | __skb_push(skb, ETH_HLEN); | |
4672 | skb->protocol = eth_type_trans(skb, skb->dev); | |
4673 | } | |
4674 | ||
d4455169 | 4675 | switch (act) { |
6103aa96 | 4676 | case XDP_REDIRECT: |
d4455169 JF |
4677 | case XDP_TX: |
4678 | __skb_push(skb, mac_len); | |
de8f3a83 | 4679 | break; |
d4455169 | 4680 | case XDP_PASS: |
02671e23 | 4681 | metalen = xdp->data - xdp->data_meta; |
de8f3a83 DB |
4682 | if (metalen) |
4683 | skb_metadata_set(skb, metalen); | |
d4455169 | 4684 | break; |
d4455169 JF |
4685 | default: |
4686 | bpf_warn_invalid_xdp_action(act); | |
df561f66 | 4687 | fallthrough; |
d4455169 JF |
4688 | case XDP_ABORTED: |
4689 | trace_xdp_exception(skb->dev, xdp_prog, act); | |
df561f66 | 4690 | fallthrough; |
d4455169 JF |
4691 | case XDP_DROP: |
4692 | do_drop: | |
4693 | kfree_skb(skb); | |
4694 | break; | |
4695 | } | |
4696 | ||
4697 | return act; | |
4698 | } | |
4699 | ||
4700 | /* When doing generic XDP we have to bypass the qdisc layer and the | |
4701 | * network taps in order to match in-driver-XDP behavior. | |
4702 | */ | |
7c497478 | 4703 | void generic_xdp_tx(struct sk_buff *skb, struct bpf_prog *xdp_prog) |
d4455169 JF |
4704 | { |
4705 | struct net_device *dev = skb->dev; | |
4706 | struct netdev_queue *txq; | |
4707 | bool free_skb = true; | |
4708 | int cpu, rc; | |
4709 | ||
4bd97d51 | 4710 | txq = netdev_core_pick_tx(dev, skb, NULL); |
d4455169 JF |
4711 | cpu = smp_processor_id(); |
4712 | HARD_TX_LOCK(dev, txq, cpu); | |
4713 | if (!netif_xmit_stopped(txq)) { | |
4714 | rc = netdev_start_xmit(skb, dev, txq, 0); | |
4715 | if (dev_xmit_complete(rc)) | |
4716 | free_skb = false; | |
4717 | } | |
4718 | HARD_TX_UNLOCK(dev, txq); | |
4719 | if (free_skb) { | |
4720 | trace_xdp_exception(dev, xdp_prog, XDP_TX); | |
4721 | kfree_skb(skb); | |
4722 | } | |
4723 | } | |
4724 | ||
02786475 | 4725 | static DEFINE_STATIC_KEY_FALSE(generic_xdp_needed_key); |
d4455169 | 4726 | |
7c497478 | 4727 | int do_xdp_generic(struct bpf_prog *xdp_prog, struct sk_buff *skb) |
d4455169 | 4728 | { |
d4455169 | 4729 | if (xdp_prog) { |
02671e23 BT |
4730 | struct xdp_buff xdp; |
4731 | u32 act; | |
6103aa96 | 4732 | int err; |
d4455169 | 4733 | |
02671e23 | 4734 | act = netif_receive_generic_xdp(skb, &xdp, xdp_prog); |
d4455169 | 4735 | if (act != XDP_PASS) { |
6103aa96 JF |
4736 | switch (act) { |
4737 | case XDP_REDIRECT: | |
2facaad6 | 4738 | err = xdp_do_generic_redirect(skb->dev, skb, |
02671e23 | 4739 | &xdp, xdp_prog); |
6103aa96 JF |
4740 | if (err) |
4741 | goto out_redir; | |
02671e23 | 4742 | break; |
6103aa96 | 4743 | case XDP_TX: |
d4455169 | 4744 | generic_xdp_tx(skb, xdp_prog); |
6103aa96 JF |
4745 | break; |
4746 | } | |
d4455169 JF |
4747 | return XDP_DROP; |
4748 | } | |
4749 | } | |
4750 | return XDP_PASS; | |
6103aa96 | 4751 | out_redir: |
6103aa96 JF |
4752 | kfree_skb(skb); |
4753 | return XDP_DROP; | |
d4455169 | 4754 | } |
7c497478 | 4755 | EXPORT_SYMBOL_GPL(do_xdp_generic); |
d4455169 | 4756 | |
ae78dbfa | 4757 | static int netif_rx_internal(struct sk_buff *skb) |
1da177e4 | 4758 | { |
b0e28f1e | 4759 | int ret; |
1da177e4 | 4760 | |
588f0330 | 4761 | net_timestamp_check(netdev_tstamp_prequeue, skb); |
1da177e4 | 4762 | |
cf66ba58 | 4763 | trace_netif_rx(skb); |
d4455169 | 4764 | |
df334545 | 4765 | #ifdef CONFIG_RPS |
dc05360f | 4766 | if (static_branch_unlikely(&rps_needed)) { |
fec5e652 | 4767 | struct rps_dev_flow voidflow, *rflow = &voidflow; |
b0e28f1e ED |
4768 | int cpu; |
4769 | ||
cece1945 | 4770 | preempt_disable(); |
b0e28f1e | 4771 | rcu_read_lock(); |
fec5e652 TH |
4772 | |
4773 | cpu = get_rps_cpu(skb->dev, skb, &rflow); | |
b0e28f1e ED |
4774 | if (cpu < 0) |
4775 | cpu = smp_processor_id(); | |
fec5e652 TH |
4776 | |
4777 | ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail); | |
4778 | ||
b0e28f1e | 4779 | rcu_read_unlock(); |
cece1945 | 4780 | preempt_enable(); |
adc9300e ED |
4781 | } else |
4782 | #endif | |
fec5e652 TH |
4783 | { |
4784 | unsigned int qtail; | |
f4563a75 | 4785 | |
fec5e652 TH |
4786 | ret = enqueue_to_backlog(skb, get_cpu(), &qtail); |
4787 | put_cpu(); | |
4788 | } | |
b0e28f1e | 4789 | return ret; |
1da177e4 | 4790 | } |
ae78dbfa BH |
4791 | |
4792 | /** | |
4793 | * netif_rx - post buffer to the network code | |
4794 | * @skb: buffer to post | |
4795 | * | |
4796 | * This function receives a packet from a device driver and queues it for | |
4797 | * the upper (protocol) levels to process. It always succeeds. The buffer | |
4798 | * may be dropped during processing for congestion control or by the | |
4799 | * protocol layers. | |
4800 | * | |
4801 | * return values: | |
4802 | * NET_RX_SUCCESS (no congestion) | |
4803 | * NET_RX_DROP (packet was dropped) | |
4804 | * | |
4805 | */ | |
4806 | ||
4807 | int netif_rx(struct sk_buff *skb) | |
4808 | { | |
b0e3f1bd GB |
4809 | int ret; |
4810 | ||
ae78dbfa BH |
4811 | trace_netif_rx_entry(skb); |
4812 | ||
b0e3f1bd GB |
4813 | ret = netif_rx_internal(skb); |
4814 | trace_netif_rx_exit(ret); | |
4815 | ||
4816 | return ret; | |
ae78dbfa | 4817 | } |
d1b19dff | 4818 | EXPORT_SYMBOL(netif_rx); |
1da177e4 LT |
4819 | |
4820 | int netif_rx_ni(struct sk_buff *skb) | |
4821 | { | |
4822 | int err; | |
4823 | ||
ae78dbfa BH |
4824 | trace_netif_rx_ni_entry(skb); |
4825 | ||
1da177e4 | 4826 | preempt_disable(); |
ae78dbfa | 4827 | err = netif_rx_internal(skb); |
1da177e4 LT |
4828 | if (local_softirq_pending()) |
4829 | do_softirq(); | |
4830 | preempt_enable(); | |
b0e3f1bd | 4831 | trace_netif_rx_ni_exit(err); |
1da177e4 LT |
4832 | |
4833 | return err; | |
4834 | } | |
1da177e4 LT |
4835 | EXPORT_SYMBOL(netif_rx_ni); |
4836 | ||
c11171a4 SAS |
4837 | int netif_rx_any_context(struct sk_buff *skb) |
4838 | { | |
4839 | /* | |
4840 | * If invoked from contexts which do not invoke bottom half | |
4841 | * processing either at return from interrupt or when softrqs are | |
4842 | * reenabled, use netif_rx_ni() which invokes bottomhalf processing | |
4843 | * directly. | |
4844 | */ | |
4845 | if (in_interrupt()) | |
4846 | return netif_rx(skb); | |
4847 | else | |
4848 | return netif_rx_ni(skb); | |
4849 | } | |
4850 | EXPORT_SYMBOL(netif_rx_any_context); | |
4851 | ||
0766f788 | 4852 | static __latent_entropy void net_tx_action(struct softirq_action *h) |
1da177e4 | 4853 | { |
903ceff7 | 4854 | struct softnet_data *sd = this_cpu_ptr(&softnet_data); |
1da177e4 LT |
4855 | |
4856 | if (sd->completion_queue) { | |
4857 | struct sk_buff *clist; | |
4858 | ||
4859 | local_irq_disable(); | |
4860 | clist = sd->completion_queue; | |
4861 | sd->completion_queue = NULL; | |
4862 | local_irq_enable(); | |
4863 | ||
4864 | while (clist) { | |
4865 | struct sk_buff *skb = clist; | |
f4563a75 | 4866 | |
1da177e4 LT |
4867 | clist = clist->next; |
4868 | ||
63354797 | 4869 | WARN_ON(refcount_read(&skb->users)); |
e6247027 ED |
4870 | if (likely(get_kfree_skb_cb(skb)->reason == SKB_REASON_CONSUMED)) |
4871 | trace_consume_skb(skb); | |
4872 | else | |
4873 | trace_kfree_skb(skb, net_tx_action); | |
15fad714 JDB |
4874 | |
4875 | if (skb->fclone != SKB_FCLONE_UNAVAILABLE) | |
4876 | __kfree_skb(skb); | |
4877 | else | |
4878 | __kfree_skb_defer(skb); | |
1da177e4 | 4879 | } |
15fad714 JDB |
4880 | |
4881 | __kfree_skb_flush(); | |
1da177e4 LT |
4882 | } |
4883 | ||
4884 | if (sd->output_queue) { | |
37437bb2 | 4885 | struct Qdisc *head; |
1da177e4 LT |
4886 | |
4887 | local_irq_disable(); | |
4888 | head = sd->output_queue; | |
4889 | sd->output_queue = NULL; | |
a9cbd588 | 4890 | sd->output_queue_tailp = &sd->output_queue; |
1da177e4 LT |
4891 | local_irq_enable(); |
4892 | ||
4893 | while (head) { | |
37437bb2 | 4894 | struct Qdisc *q = head; |
6b3ba914 | 4895 | spinlock_t *root_lock = NULL; |
37437bb2 | 4896 | |
1da177e4 LT |
4897 | head = head->next_sched; |
4898 | ||
6b3ba914 JF |
4899 | if (!(q->flags & TCQ_F_NOLOCK)) { |
4900 | root_lock = qdisc_lock(q); | |
4901 | spin_lock(root_lock); | |
4902 | } | |
3bcb846c ED |
4903 | /* We need to make sure head->next_sched is read |
4904 | * before clearing __QDISC_STATE_SCHED | |
4905 | */ | |
4906 | smp_mb__before_atomic(); | |
4907 | clear_bit(__QDISC_STATE_SCHED, &q->state); | |
4908 | qdisc_run(q); | |
6b3ba914 JF |
4909 | if (root_lock) |
4910 | spin_unlock(root_lock); | |
1da177e4 LT |
4911 | } |
4912 | } | |
f53c7239 SK |
4913 | |
4914 | xfrm_dev_backlog(sd); | |
1da177e4 LT |
4915 | } |
4916 | ||
181402a5 | 4917 | #if IS_ENABLED(CONFIG_BRIDGE) && IS_ENABLED(CONFIG_ATM_LANE) |
da678292 MM |
4918 | /* This hook is defined here for ATM LANE */ |
4919 | int (*br_fdb_test_addr_hook)(struct net_device *dev, | |
4920 | unsigned char *addr) __read_mostly; | |
4fb019a0 | 4921 | EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook); |
da678292 | 4922 | #endif |
1da177e4 | 4923 | |
1f211a1b DB |
4924 | static inline struct sk_buff * |
4925 | sch_handle_ingress(struct sk_buff *skb, struct packet_type **pt_prev, int *ret, | |
9aa1206e | 4926 | struct net_device *orig_dev, bool *another) |
f697c3e8 | 4927 | { |
e7582bab | 4928 | #ifdef CONFIG_NET_CLS_ACT |
46209401 | 4929 | struct mini_Qdisc *miniq = rcu_dereference_bh(skb->dev->miniq_ingress); |
d2788d34 | 4930 | struct tcf_result cl_res; |
24824a09 | 4931 | |
c9e99fd0 DB |
4932 | /* If there's at least one ingress present somewhere (so |
4933 | * we get here via enabled static key), remaining devices | |
4934 | * that are not configured with an ingress qdisc will bail | |
d2788d34 | 4935 | * out here. |
c9e99fd0 | 4936 | */ |
46209401 | 4937 | if (!miniq) |
4577139b | 4938 | return skb; |
46209401 | 4939 | |
f697c3e8 HX |
4940 | if (*pt_prev) { |
4941 | *ret = deliver_skb(skb, *pt_prev, orig_dev); | |
4942 | *pt_prev = NULL; | |
1da177e4 LT |
4943 | } |
4944 | ||
3365495c | 4945 | qdisc_skb_cb(skb)->pkt_len = skb->len; |
aadaca9e | 4946 | qdisc_skb_cb(skb)->mru = 0; |
8dc07fdb | 4947 | skb->tc_at_ingress = 1; |
46209401 | 4948 | mini_qdisc_bstats_cpu_update(miniq, skb); |
c9e99fd0 | 4949 | |
7d17c544 PB |
4950 | switch (tcf_classify_ingress(skb, miniq->block, miniq->filter_list, |
4951 | &cl_res, false)) { | |
d2788d34 DB |
4952 | case TC_ACT_OK: |
4953 | case TC_ACT_RECLASSIFY: | |
4954 | skb->tc_index = TC_H_MIN(cl_res.classid); | |
4955 | break; | |
4956 | case TC_ACT_SHOT: | |
46209401 | 4957 | mini_qdisc_qstats_cpu_drop(miniq); |
8a3a4c6e ED |
4958 | kfree_skb(skb); |
4959 | return NULL; | |
d2788d34 DB |
4960 | case TC_ACT_STOLEN: |
4961 | case TC_ACT_QUEUED: | |
e25ea21f | 4962 | case TC_ACT_TRAP: |
8a3a4c6e | 4963 | consume_skb(skb); |
d2788d34 | 4964 | return NULL; |
27b29f63 AS |
4965 | case TC_ACT_REDIRECT: |
4966 | /* skb_mac_header check was done by cls/act_bpf, so | |
4967 | * we can safely push the L2 header back before | |
4968 | * redirecting to another netdev | |
4969 | */ | |
4970 | __skb_push(skb, skb->mac_len); | |
9aa1206e DB |
4971 | if (skb_do_redirect(skb) == -EAGAIN) { |
4972 | __skb_pull(skb, skb->mac_len); | |
4973 | *another = true; | |
4974 | break; | |
4975 | } | |
27b29f63 | 4976 | return NULL; |
720f22fe | 4977 | case TC_ACT_CONSUMED: |
cd11b164 | 4978 | return NULL; |
d2788d34 DB |
4979 | default: |
4980 | break; | |
f697c3e8 | 4981 | } |
e7582bab | 4982 | #endif /* CONFIG_NET_CLS_ACT */ |
e687ad60 PN |
4983 | return skb; |
4984 | } | |
1da177e4 | 4985 | |
24b27fc4 MB |
4986 | /** |
4987 | * netdev_is_rx_handler_busy - check if receive handler is registered | |
4988 | * @dev: device to check | |
4989 | * | |
4990 | * Check if a receive handler is already registered for a given device. | |
4991 | * Return true if there one. | |
4992 | * | |
4993 | * The caller must hold the rtnl_mutex. | |
4994 | */ | |
4995 | bool netdev_is_rx_handler_busy(struct net_device *dev) | |
4996 | { | |
4997 | ASSERT_RTNL(); | |
4998 | return dev && rtnl_dereference(dev->rx_handler); | |
4999 | } | |
5000 | EXPORT_SYMBOL_GPL(netdev_is_rx_handler_busy); | |
5001 | ||
ab95bfe0 JP |
5002 | /** |
5003 | * netdev_rx_handler_register - register receive handler | |
5004 | * @dev: device to register a handler for | |
5005 | * @rx_handler: receive handler to register | |
93e2c32b | 5006 | * @rx_handler_data: data pointer that is used by rx handler |
ab95bfe0 | 5007 | * |
e227867f | 5008 | * Register a receive handler for a device. This handler will then be |
ab95bfe0 JP |
5009 | * called from __netif_receive_skb. A negative errno code is returned |
5010 | * on a failure. | |
5011 | * | |
5012 | * The caller must hold the rtnl_mutex. | |
8a4eb573 JP |
5013 | * |
5014 | * For a general description of rx_handler, see enum rx_handler_result. | |
ab95bfe0 JP |
5015 | */ |
5016 | int netdev_rx_handler_register(struct net_device *dev, | |
93e2c32b JP |
5017 | rx_handler_func_t *rx_handler, |
5018 | void *rx_handler_data) | |
ab95bfe0 | 5019 | { |
1b7cd004 | 5020 | if (netdev_is_rx_handler_busy(dev)) |
ab95bfe0 JP |
5021 | return -EBUSY; |
5022 | ||
f5426250 PA |
5023 | if (dev->priv_flags & IFF_NO_RX_HANDLER) |
5024 | return -EINVAL; | |
5025 | ||
00cfec37 | 5026 | /* Note: rx_handler_data must be set before rx_handler */ |
93e2c32b | 5027 | rcu_assign_pointer(dev->rx_handler_data, rx_handler_data); |
ab95bfe0 JP |
5028 | rcu_assign_pointer(dev->rx_handler, rx_handler); |
5029 | ||
5030 | return 0; | |
5031 | } | |
5032 | EXPORT_SYMBOL_GPL(netdev_rx_handler_register); | |
5033 | ||
5034 | /** | |
5035 | * netdev_rx_handler_unregister - unregister receive handler | |
5036 | * @dev: device to unregister a handler from | |
5037 | * | |
166ec369 | 5038 | * Unregister a receive handler from a device. |
ab95bfe0 JP |
5039 | * |
5040 | * The caller must hold the rtnl_mutex. | |
5041 | */ | |
5042 | void netdev_rx_handler_unregister(struct net_device *dev) | |
5043 | { | |
5044 | ||
5045 | ASSERT_RTNL(); | |
a9b3cd7f | 5046 | RCU_INIT_POINTER(dev->rx_handler, NULL); |
00cfec37 ED |
5047 | /* a reader seeing a non NULL rx_handler in a rcu_read_lock() |
5048 | * section has a guarantee to see a non NULL rx_handler_data | |
5049 | * as well. | |
5050 | */ | |
5051 | synchronize_net(); | |
a9b3cd7f | 5052 | RCU_INIT_POINTER(dev->rx_handler_data, NULL); |
ab95bfe0 JP |
5053 | } |
5054 | EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister); | |
5055 | ||
b4b9e355 MG |
5056 | /* |
5057 | * Limit the use of PFMEMALLOC reserves to those protocols that implement | |
5058 | * the special handling of PFMEMALLOC skbs. | |
5059 | */ | |
5060 | static bool skb_pfmemalloc_protocol(struct sk_buff *skb) | |
5061 | { | |
5062 | switch (skb->protocol) { | |
2b8837ae JP |
5063 | case htons(ETH_P_ARP): |
5064 | case htons(ETH_P_IP): | |
5065 | case htons(ETH_P_IPV6): | |
5066 | case htons(ETH_P_8021Q): | |
5067 | case htons(ETH_P_8021AD): | |
b4b9e355 MG |
5068 | return true; |
5069 | default: | |
5070 | return false; | |
5071 | } | |
5072 | } | |
5073 | ||
e687ad60 PN |
5074 | static inline int nf_ingress(struct sk_buff *skb, struct packet_type **pt_prev, |
5075 | int *ret, struct net_device *orig_dev) | |
5076 | { | |
5077 | if (nf_hook_ingress_active(skb)) { | |
2c1e2703 AC |
5078 | int ingress_retval; |
5079 | ||
e687ad60 PN |
5080 | if (*pt_prev) { |
5081 | *ret = deliver_skb(skb, *pt_prev, orig_dev); | |
5082 | *pt_prev = NULL; | |
5083 | } | |
5084 | ||
2c1e2703 AC |
5085 | rcu_read_lock(); |
5086 | ingress_retval = nf_hook_ingress(skb); | |
5087 | rcu_read_unlock(); | |
5088 | return ingress_retval; | |
e687ad60 PN |
5089 | } |
5090 | return 0; | |
5091 | } | |
e687ad60 | 5092 | |
c0bbbdc3 | 5093 | static int __netif_receive_skb_core(struct sk_buff **pskb, bool pfmemalloc, |
88eb1944 | 5094 | struct packet_type **ppt_prev) |
1da177e4 LT |
5095 | { |
5096 | struct packet_type *ptype, *pt_prev; | |
ab95bfe0 | 5097 | rx_handler_func_t *rx_handler; |
c0bbbdc3 | 5098 | struct sk_buff *skb = *pskb; |
f2ccd8fa | 5099 | struct net_device *orig_dev; |
8a4eb573 | 5100 | bool deliver_exact = false; |
1da177e4 | 5101 | int ret = NET_RX_DROP; |
252e3346 | 5102 | __be16 type; |
1da177e4 | 5103 | |
588f0330 | 5104 | net_timestamp_check(!netdev_tstamp_prequeue, skb); |
81bbb3d4 | 5105 | |
cf66ba58 | 5106 | trace_netif_receive_skb(skb); |
9b22ea56 | 5107 | |
cc9bd5ce | 5108 | orig_dev = skb->dev; |
8f903c70 | 5109 | |
c1d2bbe1 | 5110 | skb_reset_network_header(skb); |
fda55eca ED |
5111 | if (!skb_transport_header_was_set(skb)) |
5112 | skb_reset_transport_header(skb); | |
0b5c9db1 | 5113 | skb_reset_mac_len(skb); |
1da177e4 LT |
5114 | |
5115 | pt_prev = NULL; | |
5116 | ||
63d8ea7f | 5117 | another_round: |
b6858177 | 5118 | skb->skb_iif = skb->dev->ifindex; |
63d8ea7f DM |
5119 | |
5120 | __this_cpu_inc(softnet_data.processed); | |
5121 | ||
458bf2f2 SH |
5122 | if (static_branch_unlikely(&generic_xdp_needed_key)) { |
5123 | int ret2; | |
5124 | ||
5125 | preempt_disable(); | |
5126 | ret2 = do_xdp_generic(rcu_dereference(skb->dev->xdp_prog), skb); | |
5127 | preempt_enable(); | |
5128 | ||
c0bbbdc3 BS |
5129 | if (ret2 != XDP_PASS) { |
5130 | ret = NET_RX_DROP; | |
5131 | goto out; | |
5132 | } | |
458bf2f2 SH |
5133 | skb_reset_mac_len(skb); |
5134 | } | |
5135 | ||
8ad227ff PM |
5136 | if (skb->protocol == cpu_to_be16(ETH_P_8021Q) || |
5137 | skb->protocol == cpu_to_be16(ETH_P_8021AD)) { | |
0d5501c1 | 5138 | skb = skb_vlan_untag(skb); |
bcc6d479 | 5139 | if (unlikely(!skb)) |
2c17d27c | 5140 | goto out; |
bcc6d479 JP |
5141 | } |
5142 | ||
e7246e12 WB |
5143 | if (skb_skip_tc_classify(skb)) |
5144 | goto skip_classify; | |
1da177e4 | 5145 | |
9754e293 | 5146 | if (pfmemalloc) |
b4b9e355 MG |
5147 | goto skip_taps; |
5148 | ||
1da177e4 | 5149 | list_for_each_entry_rcu(ptype, &ptype_all, list) { |
7866a621 SN |
5150 | if (pt_prev) |
5151 | ret = deliver_skb(skb, pt_prev, orig_dev); | |
5152 | pt_prev = ptype; | |
5153 | } | |
5154 | ||
5155 | list_for_each_entry_rcu(ptype, &skb->dev->ptype_all, list) { | |
5156 | if (pt_prev) | |
5157 | ret = deliver_skb(skb, pt_prev, orig_dev); | |
5158 | pt_prev = ptype; | |
1da177e4 LT |
5159 | } |
5160 | ||
b4b9e355 | 5161 | skip_taps: |
1cf51900 | 5162 | #ifdef CONFIG_NET_INGRESS |
aabf6772 | 5163 | if (static_branch_unlikely(&ingress_needed_key)) { |
9aa1206e DB |
5164 | bool another = false; |
5165 | ||
5166 | skb = sch_handle_ingress(skb, &pt_prev, &ret, orig_dev, | |
5167 | &another); | |
5168 | if (another) | |
5169 | goto another_round; | |
4577139b | 5170 | if (!skb) |
2c17d27c | 5171 | goto out; |
e687ad60 PN |
5172 | |
5173 | if (nf_ingress(skb, &pt_prev, &ret, orig_dev) < 0) | |
2c17d27c | 5174 | goto out; |
4577139b | 5175 | } |
1cf51900 | 5176 | #endif |
2c64605b | 5177 | skb_reset_redirect(skb); |
e7246e12 | 5178 | skip_classify: |
9754e293 | 5179 | if (pfmemalloc && !skb_pfmemalloc_protocol(skb)) |
b4b9e355 MG |
5180 | goto drop; |
5181 | ||
df8a39de | 5182 | if (skb_vlan_tag_present(skb)) { |
2425717b JF |
5183 | if (pt_prev) { |
5184 | ret = deliver_skb(skb, pt_prev, orig_dev); | |
5185 | pt_prev = NULL; | |
5186 | } | |
48cc32d3 | 5187 | if (vlan_do_receive(&skb)) |
2425717b JF |
5188 | goto another_round; |
5189 | else if (unlikely(!skb)) | |
2c17d27c | 5190 | goto out; |
2425717b JF |
5191 | } |
5192 | ||
48cc32d3 | 5193 | rx_handler = rcu_dereference(skb->dev->rx_handler); |
ab95bfe0 JP |
5194 | if (rx_handler) { |
5195 | if (pt_prev) { | |
5196 | ret = deliver_skb(skb, pt_prev, orig_dev); | |
5197 | pt_prev = NULL; | |
5198 | } | |
8a4eb573 JP |
5199 | switch (rx_handler(&skb)) { |
5200 | case RX_HANDLER_CONSUMED: | |
3bc1b1ad | 5201 | ret = NET_RX_SUCCESS; |
2c17d27c | 5202 | goto out; |
8a4eb573 | 5203 | case RX_HANDLER_ANOTHER: |
63d8ea7f | 5204 | goto another_round; |
8a4eb573 JP |
5205 | case RX_HANDLER_EXACT: |
5206 | deliver_exact = true; | |
5207 | case RX_HANDLER_PASS: | |
5208 | break; | |
5209 | default: | |
5210 | BUG(); | |
5211 | } | |
ab95bfe0 | 5212 | } |
1da177e4 | 5213 | |
b14a9fc4 | 5214 | if (unlikely(skb_vlan_tag_present(skb)) && !netdev_uses_dsa(skb->dev)) { |
36b2f61a GV |
5215 | check_vlan_id: |
5216 | if (skb_vlan_tag_get_id(skb)) { | |
5217 | /* Vlan id is non 0 and vlan_do_receive() above couldn't | |
5218 | * find vlan device. | |
5219 | */ | |
d4b812de | 5220 | skb->pkt_type = PACKET_OTHERHOST; |
36b2f61a GV |
5221 | } else if (skb->protocol == cpu_to_be16(ETH_P_8021Q) || |
5222 | skb->protocol == cpu_to_be16(ETH_P_8021AD)) { | |
5223 | /* Outer header is 802.1P with vlan 0, inner header is | |
5224 | * 802.1Q or 802.1AD and vlan_do_receive() above could | |
5225 | * not find vlan dev for vlan id 0. | |
5226 | */ | |
5227 | __vlan_hwaccel_clear_tag(skb); | |
5228 | skb = skb_vlan_untag(skb); | |
5229 | if (unlikely(!skb)) | |
5230 | goto out; | |
5231 | if (vlan_do_receive(&skb)) | |
5232 | /* After stripping off 802.1P header with vlan 0 | |
5233 | * vlan dev is found for inner header. | |
5234 | */ | |
5235 | goto another_round; | |
5236 | else if (unlikely(!skb)) | |
5237 | goto out; | |
5238 | else | |
5239 | /* We have stripped outer 802.1P vlan 0 header. | |
5240 | * But could not find vlan dev. | |
5241 | * check again for vlan id to set OTHERHOST. | |
5242 | */ | |
5243 | goto check_vlan_id; | |
5244 | } | |
d4b812de ED |
5245 | /* Note: we might in the future use prio bits |
5246 | * and set skb->priority like in vlan_do_receive() | |
5247 | * For the time being, just ignore Priority Code Point | |
5248 | */ | |
b1817524 | 5249 | __vlan_hwaccel_clear_tag(skb); |
d4b812de | 5250 | } |
48cc32d3 | 5251 | |
7866a621 SN |
5252 | type = skb->protocol; |
5253 | ||
63d8ea7f | 5254 | /* deliver only exact match when indicated */ |
7866a621 SN |
5255 | if (likely(!deliver_exact)) { |
5256 | deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type, | |
5257 | &ptype_base[ntohs(type) & | |
5258 | PTYPE_HASH_MASK]); | |
5259 | } | |
1f3c8804 | 5260 | |
7866a621 SN |
5261 | deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type, |
5262 | &orig_dev->ptype_specific); | |
5263 | ||
5264 | if (unlikely(skb->dev != orig_dev)) { | |
5265 | deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type, | |
5266 | &skb->dev->ptype_specific); | |
1da177e4 LT |
5267 | } |
5268 | ||
5269 | if (pt_prev) { | |
1f8b977a | 5270 | if (unlikely(skb_orphan_frags_rx(skb, GFP_ATOMIC))) |
0e698bf6 | 5271 | goto drop; |
88eb1944 | 5272 | *ppt_prev = pt_prev; |
1da177e4 | 5273 | } else { |
b4b9e355 | 5274 | drop: |
6e7333d3 JW |
5275 | if (!deliver_exact) |
5276 | atomic_long_inc(&skb->dev->rx_dropped); | |
5277 | else | |
5278 | atomic_long_inc(&skb->dev->rx_nohandler); | |
1da177e4 LT |
5279 | kfree_skb(skb); |
5280 | /* Jamal, now you will not able to escape explaining | |
5281 | * me how you were going to use this. :-) | |
5282 | */ | |
5283 | ret = NET_RX_DROP; | |
5284 | } | |
5285 | ||
2c17d27c | 5286 | out: |
c0bbbdc3 BS |
5287 | /* The invariant here is that if *ppt_prev is not NULL |
5288 | * then skb should also be non-NULL. | |
5289 | * | |
5290 | * Apparently *ppt_prev assignment above holds this invariant due to | |
5291 | * skb dereferencing near it. | |
5292 | */ | |
5293 | *pskb = skb; | |
9754e293 DM |
5294 | return ret; |
5295 | } | |
5296 | ||
88eb1944 EC |
5297 | static int __netif_receive_skb_one_core(struct sk_buff *skb, bool pfmemalloc) |
5298 | { | |
5299 | struct net_device *orig_dev = skb->dev; | |
5300 | struct packet_type *pt_prev = NULL; | |
5301 | int ret; | |
5302 | ||
c0bbbdc3 | 5303 | ret = __netif_receive_skb_core(&skb, pfmemalloc, &pt_prev); |
88eb1944 | 5304 | if (pt_prev) |
f5737cba PA |
5305 | ret = INDIRECT_CALL_INET(pt_prev->func, ipv6_rcv, ip_rcv, skb, |
5306 | skb->dev, pt_prev, orig_dev); | |
88eb1944 EC |
5307 | return ret; |
5308 | } | |
5309 | ||
1c601d82 JDB |
5310 | /** |
5311 | * netif_receive_skb_core - special purpose version of netif_receive_skb | |
5312 | * @skb: buffer to process | |
5313 | * | |
5314 | * More direct receive version of netif_receive_skb(). It should | |
5315 | * only be used by callers that have a need to skip RPS and Generic XDP. | |
2de9780f | 5316 | * Caller must also take care of handling if ``(page_is_)pfmemalloc``. |
1c601d82 JDB |
5317 | * |
5318 | * This function may only be called from softirq context and interrupts | |
5319 | * should be enabled. | |
5320 | * | |
5321 | * Return values (usually ignored): | |
5322 | * NET_RX_SUCCESS: no congestion | |
5323 | * NET_RX_DROP: packet was dropped | |
5324 | */ | |
5325 | int netif_receive_skb_core(struct sk_buff *skb) | |
5326 | { | |
5327 | int ret; | |
5328 | ||
5329 | rcu_read_lock(); | |
88eb1944 | 5330 | ret = __netif_receive_skb_one_core(skb, false); |
1c601d82 JDB |
5331 | rcu_read_unlock(); |
5332 | ||
5333 | return ret; | |
5334 | } | |
5335 | EXPORT_SYMBOL(netif_receive_skb_core); | |
5336 | ||
88eb1944 EC |
5337 | static inline void __netif_receive_skb_list_ptype(struct list_head *head, |
5338 | struct packet_type *pt_prev, | |
5339 | struct net_device *orig_dev) | |
4ce0017a EC |
5340 | { |
5341 | struct sk_buff *skb, *next; | |
5342 | ||
88eb1944 EC |
5343 | if (!pt_prev) |
5344 | return; | |
5345 | if (list_empty(head)) | |
5346 | return; | |
17266ee9 | 5347 | if (pt_prev->list_func != NULL) |
fdf71426 PA |
5348 | INDIRECT_CALL_INET(pt_prev->list_func, ipv6_list_rcv, |
5349 | ip_list_rcv, head, pt_prev, orig_dev); | |
17266ee9 | 5350 | else |
9a5a90d1 AL |
5351 | list_for_each_entry_safe(skb, next, head, list) { |
5352 | skb_list_del_init(skb); | |
fdf71426 | 5353 | pt_prev->func(skb, skb->dev, pt_prev, orig_dev); |
9a5a90d1 | 5354 | } |
88eb1944 EC |
5355 | } |
5356 | ||
5357 | static void __netif_receive_skb_list_core(struct list_head *head, bool pfmemalloc) | |
5358 | { | |
5359 | /* Fast-path assumptions: | |
5360 | * - There is no RX handler. | |
5361 | * - Only one packet_type matches. | |
5362 | * If either of these fails, we will end up doing some per-packet | |
5363 | * processing in-line, then handling the 'last ptype' for the whole | |
5364 | * sublist. This can't cause out-of-order delivery to any single ptype, | |
5365 | * because the 'last ptype' must be constant across the sublist, and all | |
5366 | * other ptypes are handled per-packet. | |
5367 | */ | |
5368 | /* Current (common) ptype of sublist */ | |
5369 | struct packet_type *pt_curr = NULL; | |
5370 | /* Current (common) orig_dev of sublist */ | |
5371 | struct net_device *od_curr = NULL; | |
5372 | struct list_head sublist; | |
5373 | struct sk_buff *skb, *next; | |
5374 | ||
9af86f93 | 5375 | INIT_LIST_HEAD(&sublist); |
88eb1944 EC |
5376 | list_for_each_entry_safe(skb, next, head, list) { |
5377 | struct net_device *orig_dev = skb->dev; | |
5378 | struct packet_type *pt_prev = NULL; | |
5379 | ||
22f6bbb7 | 5380 | skb_list_del_init(skb); |
c0bbbdc3 | 5381 | __netif_receive_skb_core(&skb, pfmemalloc, &pt_prev); |
9af86f93 EC |
5382 | if (!pt_prev) |
5383 | continue; | |
88eb1944 EC |
5384 | if (pt_curr != pt_prev || od_curr != orig_dev) { |
5385 | /* dispatch old sublist */ | |
88eb1944 EC |
5386 | __netif_receive_skb_list_ptype(&sublist, pt_curr, od_curr); |
5387 | /* start new sublist */ | |
9af86f93 | 5388 | INIT_LIST_HEAD(&sublist); |
88eb1944 EC |
5389 | pt_curr = pt_prev; |
5390 | od_curr = orig_dev; | |
5391 | } | |
9af86f93 | 5392 | list_add_tail(&skb->list, &sublist); |
88eb1944 EC |
5393 | } |
5394 | ||
5395 | /* dispatch final sublist */ | |
9af86f93 | 5396 | __netif_receive_skb_list_ptype(&sublist, pt_curr, od_curr); |
4ce0017a EC |
5397 | } |
5398 | ||
9754e293 DM |
5399 | static int __netif_receive_skb(struct sk_buff *skb) |
5400 | { | |
5401 | int ret; | |
5402 | ||
5403 | if (sk_memalloc_socks() && skb_pfmemalloc(skb)) { | |
f1083048 | 5404 | unsigned int noreclaim_flag; |
9754e293 DM |
5405 | |
5406 | /* | |
5407 | * PFMEMALLOC skbs are special, they should | |
5408 | * - be delivered to SOCK_MEMALLOC sockets only | |
5409 | * - stay away from userspace | |
5410 | * - have bounded memory usage | |
5411 | * | |
5412 | * Use PF_MEMALLOC as this saves us from propagating the allocation | |
5413 | * context down to all allocation sites. | |
5414 | */ | |
f1083048 | 5415 | noreclaim_flag = memalloc_noreclaim_save(); |
88eb1944 | 5416 | ret = __netif_receive_skb_one_core(skb, true); |
f1083048 | 5417 | memalloc_noreclaim_restore(noreclaim_flag); |
9754e293 | 5418 | } else |
88eb1944 | 5419 | ret = __netif_receive_skb_one_core(skb, false); |
9754e293 | 5420 | |
1da177e4 LT |
5421 | return ret; |
5422 | } | |
0a9627f2 | 5423 | |
4ce0017a EC |
5424 | static void __netif_receive_skb_list(struct list_head *head) |
5425 | { | |
5426 | unsigned long noreclaim_flag = 0; | |
5427 | struct sk_buff *skb, *next; | |
5428 | bool pfmemalloc = false; /* Is current sublist PF_MEMALLOC? */ | |
5429 | ||
5430 | list_for_each_entry_safe(skb, next, head, list) { | |
5431 | if ((sk_memalloc_socks() && skb_pfmemalloc(skb)) != pfmemalloc) { | |
5432 | struct list_head sublist; | |
5433 | ||
5434 | /* Handle the previous sublist */ | |
5435 | list_cut_before(&sublist, head, &skb->list); | |
b9f463d6 EC |
5436 | if (!list_empty(&sublist)) |
5437 | __netif_receive_skb_list_core(&sublist, pfmemalloc); | |
4ce0017a EC |
5438 | pfmemalloc = !pfmemalloc; |
5439 | /* See comments in __netif_receive_skb */ | |
5440 | if (pfmemalloc) | |
5441 | noreclaim_flag = memalloc_noreclaim_save(); | |
5442 | else | |
5443 | memalloc_noreclaim_restore(noreclaim_flag); | |
5444 | } | |
5445 | } | |
5446 | /* Handle the remaining sublist */ | |
b9f463d6 EC |
5447 | if (!list_empty(head)) |
5448 | __netif_receive_skb_list_core(head, pfmemalloc); | |
4ce0017a EC |
5449 | /* Restore pflags */ |
5450 | if (pfmemalloc) | |
5451 | memalloc_noreclaim_restore(noreclaim_flag); | |
5452 | } | |
5453 | ||
f4e63525 | 5454 | static int generic_xdp_install(struct net_device *dev, struct netdev_bpf *xdp) |
b5cdae32 | 5455 | { |
58038695 | 5456 | struct bpf_prog *old = rtnl_dereference(dev->xdp_prog); |
b5cdae32 DM |
5457 | struct bpf_prog *new = xdp->prog; |
5458 | int ret = 0; | |
5459 | ||
fbee97fe DA |
5460 | if (new) { |
5461 | u32 i; | |
5462 | ||
984fe94f YZ |
5463 | mutex_lock(&new->aux->used_maps_mutex); |
5464 | ||
fbee97fe DA |
5465 | /* generic XDP does not work with DEVMAPs that can |
5466 | * have a bpf_prog installed on an entry | |
5467 | */ | |
5468 | for (i = 0; i < new->aux->used_map_cnt; i++) { | |
984fe94f YZ |
5469 | if (dev_map_can_have_prog(new->aux->used_maps[i]) || |
5470 | cpu_map_prog_allowed(new->aux->used_maps[i])) { | |
5471 | mutex_unlock(&new->aux->used_maps_mutex); | |
92164774 | 5472 | return -EINVAL; |
984fe94f | 5473 | } |
fbee97fe | 5474 | } |
984fe94f YZ |
5475 | |
5476 | mutex_unlock(&new->aux->used_maps_mutex); | |
fbee97fe DA |
5477 | } |
5478 | ||
b5cdae32 | 5479 | switch (xdp->command) { |
58038695 | 5480 | case XDP_SETUP_PROG: |
b5cdae32 DM |
5481 | rcu_assign_pointer(dev->xdp_prog, new); |
5482 | if (old) | |
5483 | bpf_prog_put(old); | |
5484 | ||
5485 | if (old && !new) { | |
02786475 | 5486 | static_branch_dec(&generic_xdp_needed_key); |
b5cdae32 | 5487 | } else if (new && !old) { |
02786475 | 5488 | static_branch_inc(&generic_xdp_needed_key); |
b5cdae32 | 5489 | dev_disable_lro(dev); |
56f5aa77 | 5490 | dev_disable_gro_hw(dev); |
b5cdae32 DM |
5491 | } |
5492 | break; | |
b5cdae32 | 5493 | |
b5cdae32 DM |
5494 | default: |
5495 | ret = -EINVAL; | |
5496 | break; | |
5497 | } | |
5498 | ||
5499 | return ret; | |
5500 | } | |
5501 | ||
ae78dbfa | 5502 | static int netif_receive_skb_internal(struct sk_buff *skb) |
0a9627f2 | 5503 | { |
2c17d27c JA |
5504 | int ret; |
5505 | ||
588f0330 | 5506 | net_timestamp_check(netdev_tstamp_prequeue, skb); |
3b098e2d | 5507 | |
c1f19b51 RC |
5508 | if (skb_defer_rx_timestamp(skb)) |
5509 | return NET_RX_SUCCESS; | |
5510 | ||
bbbe211c | 5511 | rcu_read_lock(); |
df334545 | 5512 | #ifdef CONFIG_RPS |
dc05360f | 5513 | if (static_branch_unlikely(&rps_needed)) { |
3b098e2d | 5514 | struct rps_dev_flow voidflow, *rflow = &voidflow; |
2c17d27c | 5515 | int cpu = get_rps_cpu(skb->dev, skb, &rflow); |
0a9627f2 | 5516 | |
3b098e2d ED |
5517 | if (cpu >= 0) { |
5518 | ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail); | |
5519 | rcu_read_unlock(); | |
adc9300e | 5520 | return ret; |
3b098e2d | 5521 | } |
fec5e652 | 5522 | } |
1e94d72f | 5523 | #endif |
2c17d27c JA |
5524 | ret = __netif_receive_skb(skb); |
5525 | rcu_read_unlock(); | |
5526 | return ret; | |
0a9627f2 | 5527 | } |
ae78dbfa | 5528 | |
7da517a3 EC |
5529 | static void netif_receive_skb_list_internal(struct list_head *head) |
5530 | { | |
7da517a3 | 5531 | struct sk_buff *skb, *next; |
8c057efa | 5532 | struct list_head sublist; |
7da517a3 | 5533 | |
8c057efa | 5534 | INIT_LIST_HEAD(&sublist); |
7da517a3 EC |
5535 | list_for_each_entry_safe(skb, next, head, list) { |
5536 | net_timestamp_check(netdev_tstamp_prequeue, skb); | |
22f6bbb7 | 5537 | skb_list_del_init(skb); |
8c057efa EC |
5538 | if (!skb_defer_rx_timestamp(skb)) |
5539 | list_add_tail(&skb->list, &sublist); | |
7da517a3 | 5540 | } |
8c057efa | 5541 | list_splice_init(&sublist, head); |
7da517a3 | 5542 | |
7da517a3 EC |
5543 | rcu_read_lock(); |
5544 | #ifdef CONFIG_RPS | |
dc05360f | 5545 | if (static_branch_unlikely(&rps_needed)) { |
7da517a3 EC |
5546 | list_for_each_entry_safe(skb, next, head, list) { |
5547 | struct rps_dev_flow voidflow, *rflow = &voidflow; | |
5548 | int cpu = get_rps_cpu(skb->dev, skb, &rflow); | |
5549 | ||
5550 | if (cpu >= 0) { | |
8c057efa | 5551 | /* Will be handled, remove from list */ |
22f6bbb7 | 5552 | skb_list_del_init(skb); |
8c057efa | 5553 | enqueue_to_backlog(skb, cpu, &rflow->last_qtail); |
7da517a3 EC |
5554 | } |
5555 | } | |
5556 | } | |
5557 | #endif | |
5558 | __netif_receive_skb_list(head); | |
5559 | rcu_read_unlock(); | |
5560 | } | |
5561 | ||
ae78dbfa BH |
5562 | /** |
5563 | * netif_receive_skb - process receive buffer from network | |
5564 | * @skb: buffer to process | |
5565 | * | |
5566 | * netif_receive_skb() is the main receive data processing function. | |
5567 | * It always succeeds. The buffer may be dropped during processing | |
5568 | * for congestion control or by the protocol layers. | |
5569 | * | |
5570 | * This function may only be called from softirq context and interrupts | |
5571 | * should be enabled. | |
5572 | * | |
5573 | * Return values (usually ignored): | |
5574 | * NET_RX_SUCCESS: no congestion | |
5575 | * NET_RX_DROP: packet was dropped | |
5576 | */ | |
04eb4489 | 5577 | int netif_receive_skb(struct sk_buff *skb) |
ae78dbfa | 5578 | { |
b0e3f1bd GB |
5579 | int ret; |
5580 | ||
ae78dbfa BH |
5581 | trace_netif_receive_skb_entry(skb); |
5582 | ||
b0e3f1bd GB |
5583 | ret = netif_receive_skb_internal(skb); |
5584 | trace_netif_receive_skb_exit(ret); | |
5585 | ||
5586 | return ret; | |
ae78dbfa | 5587 | } |
04eb4489 | 5588 | EXPORT_SYMBOL(netif_receive_skb); |
1da177e4 | 5589 | |
f6ad8c1b EC |
5590 | /** |
5591 | * netif_receive_skb_list - process many receive buffers from network | |
5592 | * @head: list of skbs to process. | |
5593 | * | |
7da517a3 EC |
5594 | * Since return value of netif_receive_skb() is normally ignored, and |
5595 | * wouldn't be meaningful for a list, this function returns void. | |
f6ad8c1b EC |
5596 | * |
5597 | * This function may only be called from softirq context and interrupts | |
5598 | * should be enabled. | |
5599 | */ | |
5600 | void netif_receive_skb_list(struct list_head *head) | |
5601 | { | |
7da517a3 | 5602 | struct sk_buff *skb; |
f6ad8c1b | 5603 | |
b9f463d6 EC |
5604 | if (list_empty(head)) |
5605 | return; | |
b0e3f1bd GB |
5606 | if (trace_netif_receive_skb_list_entry_enabled()) { |
5607 | list_for_each_entry(skb, head, list) | |
5608 | trace_netif_receive_skb_list_entry(skb); | |
5609 | } | |
7da517a3 | 5610 | netif_receive_skb_list_internal(head); |
b0e3f1bd | 5611 | trace_netif_receive_skb_list_exit(0); |
f6ad8c1b EC |
5612 | } |
5613 | EXPORT_SYMBOL(netif_receive_skb_list); | |
5614 | ||
ce1e2a77 | 5615 | static DEFINE_PER_CPU(struct work_struct, flush_works); |
145dd5f9 PA |
5616 | |
5617 | /* Network device is going away, flush any packets still pending */ | |
5618 | static void flush_backlog(struct work_struct *work) | |
6e583ce5 | 5619 | { |
6e583ce5 | 5620 | struct sk_buff *skb, *tmp; |
145dd5f9 PA |
5621 | struct softnet_data *sd; |
5622 | ||
5623 | local_bh_disable(); | |
5624 | sd = this_cpu_ptr(&softnet_data); | |
6e583ce5 | 5625 | |
145dd5f9 | 5626 | local_irq_disable(); |
e36fa2f7 | 5627 | rps_lock(sd); |
6e7676c1 | 5628 | skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) { |
41852497 | 5629 | if (skb->dev->reg_state == NETREG_UNREGISTERING) { |
e36fa2f7 | 5630 | __skb_unlink(skb, &sd->input_pkt_queue); |
7df5cb75 | 5631 | dev_kfree_skb_irq(skb); |
76cc8b13 | 5632 | input_queue_head_incr(sd); |
6e583ce5 | 5633 | } |
6e7676c1 | 5634 | } |
e36fa2f7 | 5635 | rps_unlock(sd); |
145dd5f9 | 5636 | local_irq_enable(); |
6e7676c1 CG |
5637 | |
5638 | skb_queue_walk_safe(&sd->process_queue, skb, tmp) { | |
41852497 | 5639 | if (skb->dev->reg_state == NETREG_UNREGISTERING) { |
6e7676c1 CG |
5640 | __skb_unlink(skb, &sd->process_queue); |
5641 | kfree_skb(skb); | |
76cc8b13 | 5642 | input_queue_head_incr(sd); |
6e7676c1 CG |
5643 | } |
5644 | } | |
145dd5f9 PA |
5645 | local_bh_enable(); |
5646 | } | |
5647 | ||
2de79ee2 PA |
5648 | static bool flush_required(int cpu) |
5649 | { | |
5650 | #if IS_ENABLED(CONFIG_RPS) | |
5651 | struct softnet_data *sd = &per_cpu(softnet_data, cpu); | |
5652 | bool do_flush; | |
5653 | ||
5654 | local_irq_disable(); | |
5655 | rps_lock(sd); | |
5656 | ||
5657 | /* as insertion into process_queue happens with the rps lock held, | |
5658 | * process_queue access may race only with dequeue | |
5659 | */ | |
5660 | do_flush = !skb_queue_empty(&sd->input_pkt_queue) || | |
5661 | !skb_queue_empty_lockless(&sd->process_queue); | |
5662 | rps_unlock(sd); | |
5663 | local_irq_enable(); | |
5664 | ||
5665 | return do_flush; | |
5666 | #endif | |
5667 | /* without RPS we can't safely check input_pkt_queue: during a | |
5668 | * concurrent remote skb_queue_splice() we can detect as empty both | |
5669 | * input_pkt_queue and process_queue even if the latter could end-up | |
5670 | * containing a lot of packets. | |
5671 | */ | |
5672 | return true; | |
5673 | } | |
5674 | ||
41852497 | 5675 | static void flush_all_backlogs(void) |
145dd5f9 | 5676 | { |
2de79ee2 | 5677 | static cpumask_t flush_cpus; |
145dd5f9 PA |
5678 | unsigned int cpu; |
5679 | ||
2de79ee2 PA |
5680 | /* since we are under rtnl lock protection we can use static data |
5681 | * for the cpumask and avoid allocating on stack the possibly | |
5682 | * large mask | |
5683 | */ | |
5684 | ASSERT_RTNL(); | |
5685 | ||
145dd5f9 PA |
5686 | get_online_cpus(); |
5687 | ||
2de79ee2 PA |
5688 | cpumask_clear(&flush_cpus); |
5689 | for_each_online_cpu(cpu) { | |
5690 | if (flush_required(cpu)) { | |
5691 | queue_work_on(cpu, system_highpri_wq, | |
5692 | per_cpu_ptr(&flush_works, cpu)); | |
5693 | cpumask_set_cpu(cpu, &flush_cpus); | |
5694 | } | |
5695 | } | |
145dd5f9 | 5696 | |
2de79ee2 PA |
5697 | /* we can have in flight packet[s] on the cpus we are not flushing, |
5698 | * synchronize_net() in rollback_registered_many() will take care of | |
5699 | * them | |
5700 | */ | |
5701 | for_each_cpu(cpu, &flush_cpus) | |
41852497 | 5702 | flush_work(per_cpu_ptr(&flush_works, cpu)); |
145dd5f9 PA |
5703 | |
5704 | put_online_cpus(); | |
6e583ce5 SH |
5705 | } |
5706 | ||
c8079432 MM |
5707 | /* Pass the currently batched GRO_NORMAL SKBs up to the stack. */ |
5708 | static void gro_normal_list(struct napi_struct *napi) | |
5709 | { | |
5710 | if (!napi->rx_count) | |
5711 | return; | |
5712 | netif_receive_skb_list_internal(&napi->rx_list); | |
5713 | INIT_LIST_HEAD(&napi->rx_list); | |
5714 | napi->rx_count = 0; | |
5715 | } | |
5716 | ||
5717 | /* Queue one GRO_NORMAL SKB up for list processing. If batch size exceeded, | |
5718 | * pass the whole batch up to the stack. | |
5719 | */ | |
5720 | static void gro_normal_one(struct napi_struct *napi, struct sk_buff *skb) | |
5721 | { | |
5722 | list_add_tail(&skb->list, &napi->rx_list); | |
5723 | if (++napi->rx_count >= gro_normal_batch) | |
5724 | gro_normal_list(napi); | |
5725 | } | |
5726 | ||
aaa5d90b PA |
5727 | INDIRECT_CALLABLE_DECLARE(int inet_gro_complete(struct sk_buff *, int)); |
5728 | INDIRECT_CALLABLE_DECLARE(int ipv6_gro_complete(struct sk_buff *, int)); | |
c8079432 | 5729 | static int napi_gro_complete(struct napi_struct *napi, struct sk_buff *skb) |
d565b0a1 | 5730 | { |
22061d80 | 5731 | struct packet_offload *ptype; |
d565b0a1 | 5732 | __be16 type = skb->protocol; |
22061d80 | 5733 | struct list_head *head = &offload_base; |
d565b0a1 HX |
5734 | int err = -ENOENT; |
5735 | ||
c3c7c254 ED |
5736 | BUILD_BUG_ON(sizeof(struct napi_gro_cb) > sizeof(skb->cb)); |
5737 | ||
fc59f9a3 HX |
5738 | if (NAPI_GRO_CB(skb)->count == 1) { |
5739 | skb_shinfo(skb)->gso_size = 0; | |
d565b0a1 | 5740 | goto out; |
fc59f9a3 | 5741 | } |
d565b0a1 HX |
5742 | |
5743 | rcu_read_lock(); | |
5744 | list_for_each_entry_rcu(ptype, head, list) { | |
f191a1d1 | 5745 | if (ptype->type != type || !ptype->callbacks.gro_complete) |
d565b0a1 HX |
5746 | continue; |
5747 | ||
aaa5d90b PA |
5748 | err = INDIRECT_CALL_INET(ptype->callbacks.gro_complete, |
5749 | ipv6_gro_complete, inet_gro_complete, | |
5750 | skb, 0); | |
d565b0a1 HX |
5751 | break; |
5752 | } | |
5753 | rcu_read_unlock(); | |
5754 | ||
5755 | if (err) { | |
5756 | WARN_ON(&ptype->list == head); | |
5757 | kfree_skb(skb); | |
5758 | return NET_RX_SUCCESS; | |
5759 | } | |
5760 | ||
5761 | out: | |
c8079432 MM |
5762 | gro_normal_one(napi, skb); |
5763 | return NET_RX_SUCCESS; | |
d565b0a1 HX |
5764 | } |
5765 | ||
6312fe77 | 5766 | static void __napi_gro_flush_chain(struct napi_struct *napi, u32 index, |
07d78363 | 5767 | bool flush_old) |
d565b0a1 | 5768 | { |
6312fe77 | 5769 | struct list_head *head = &napi->gro_hash[index].list; |
d4546c25 | 5770 | struct sk_buff *skb, *p; |
2e71a6f8 | 5771 | |
07d78363 | 5772 | list_for_each_entry_safe_reverse(skb, p, head, list) { |
2e71a6f8 ED |
5773 | if (flush_old && NAPI_GRO_CB(skb)->age == jiffies) |
5774 | return; | |
992cba7e | 5775 | skb_list_del_init(skb); |
c8079432 | 5776 | napi_gro_complete(napi, skb); |
6312fe77 | 5777 | napi->gro_hash[index].count--; |
d565b0a1 | 5778 | } |
d9f37d01 LR |
5779 | |
5780 | if (!napi->gro_hash[index].count) | |
5781 | __clear_bit(index, &napi->gro_bitmask); | |
d565b0a1 | 5782 | } |
07d78363 | 5783 | |
6312fe77 | 5784 | /* napi->gro_hash[].list contains packets ordered by age. |
07d78363 DM |
5785 | * youngest packets at the head of it. |
5786 | * Complete skbs in reverse order to reduce latencies. | |
5787 | */ | |
5788 | void napi_gro_flush(struct napi_struct *napi, bool flush_old) | |
5789 | { | |
42519ede ED |
5790 | unsigned long bitmask = napi->gro_bitmask; |
5791 | unsigned int i, base = ~0U; | |
07d78363 | 5792 | |
42519ede ED |
5793 | while ((i = ffs(bitmask)) != 0) { |
5794 | bitmask >>= i; | |
5795 | base += i; | |
5796 | __napi_gro_flush_chain(napi, base, flush_old); | |
d9f37d01 | 5797 | } |
07d78363 | 5798 | } |
86cac58b | 5799 | EXPORT_SYMBOL(napi_gro_flush); |
d565b0a1 | 5800 | |
07d78363 DM |
5801 | static struct list_head *gro_list_prepare(struct napi_struct *napi, |
5802 | struct sk_buff *skb) | |
89c5fa33 | 5803 | { |
89c5fa33 | 5804 | unsigned int maclen = skb->dev->hard_header_len; |
0b4cec8c | 5805 | u32 hash = skb_get_hash_raw(skb); |
07d78363 | 5806 | struct list_head *head; |
d4546c25 | 5807 | struct sk_buff *p; |
89c5fa33 | 5808 | |
6312fe77 | 5809 | head = &napi->gro_hash[hash & (GRO_HASH_BUCKETS - 1)].list; |
07d78363 | 5810 | list_for_each_entry(p, head, list) { |
89c5fa33 ED |
5811 | unsigned long diffs; |
5812 | ||
0b4cec8c TH |
5813 | NAPI_GRO_CB(p)->flush = 0; |
5814 | ||
5815 | if (hash != skb_get_hash_raw(p)) { | |
5816 | NAPI_GRO_CB(p)->same_flow = 0; | |
5817 | continue; | |
5818 | } | |
5819 | ||
89c5fa33 | 5820 | diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev; |
b1817524 MM |
5821 | diffs |= skb_vlan_tag_present(p) ^ skb_vlan_tag_present(skb); |
5822 | if (skb_vlan_tag_present(p)) | |
fc5141cb | 5823 | diffs |= skb_vlan_tag_get(p) ^ skb_vlan_tag_get(skb); |
ce87fc6c | 5824 | diffs |= skb_metadata_dst_cmp(p, skb); |
de8f3a83 | 5825 | diffs |= skb_metadata_differs(p, skb); |
89c5fa33 ED |
5826 | if (maclen == ETH_HLEN) |
5827 | diffs |= compare_ether_header(skb_mac_header(p), | |
a50e233c | 5828 | skb_mac_header(skb)); |
89c5fa33 ED |
5829 | else if (!diffs) |
5830 | diffs = memcmp(skb_mac_header(p), | |
a50e233c | 5831 | skb_mac_header(skb), |
89c5fa33 ED |
5832 | maclen); |
5833 | NAPI_GRO_CB(p)->same_flow = !diffs; | |
89c5fa33 | 5834 | } |
07d78363 DM |
5835 | |
5836 | return head; | |
89c5fa33 ED |
5837 | } |
5838 | ||
299603e8 JC |
5839 | static void skb_gro_reset_offset(struct sk_buff *skb) |
5840 | { | |
5841 | const struct skb_shared_info *pinfo = skb_shinfo(skb); | |
5842 | const skb_frag_t *frag0 = &pinfo->frags[0]; | |
5843 | ||
5844 | NAPI_GRO_CB(skb)->data_offset = 0; | |
5845 | NAPI_GRO_CB(skb)->frag0 = NULL; | |
5846 | NAPI_GRO_CB(skb)->frag0_len = 0; | |
5847 | ||
8aef998d | 5848 | if (!skb_headlen(skb) && pinfo->nr_frags && |
299603e8 JC |
5849 | !PageHighMem(skb_frag_page(frag0))) { |
5850 | NAPI_GRO_CB(skb)->frag0 = skb_frag_address(frag0); | |
7cfd5fd5 ED |
5851 | NAPI_GRO_CB(skb)->frag0_len = min_t(unsigned int, |
5852 | skb_frag_size(frag0), | |
5853 | skb->end - skb->tail); | |
89c5fa33 ED |
5854 | } |
5855 | } | |
5856 | ||
a50e233c ED |
5857 | static void gro_pull_from_frag0(struct sk_buff *skb, int grow) |
5858 | { | |
5859 | struct skb_shared_info *pinfo = skb_shinfo(skb); | |
5860 | ||
5861 | BUG_ON(skb->end - skb->tail < grow); | |
5862 | ||
5863 | memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow); | |
5864 | ||
5865 | skb->data_len -= grow; | |
5866 | skb->tail += grow; | |
5867 | ||
b54c9d5b | 5868 | skb_frag_off_add(&pinfo->frags[0], grow); |
a50e233c ED |
5869 | skb_frag_size_sub(&pinfo->frags[0], grow); |
5870 | ||
5871 | if (unlikely(!skb_frag_size(&pinfo->frags[0]))) { | |
5872 | skb_frag_unref(skb, 0); | |
5873 | memmove(pinfo->frags, pinfo->frags + 1, | |
5874 | --pinfo->nr_frags * sizeof(pinfo->frags[0])); | |
5875 | } | |
5876 | } | |
5877 | ||
c8079432 | 5878 | static void gro_flush_oldest(struct napi_struct *napi, struct list_head *head) |
07d78363 | 5879 | { |
6312fe77 | 5880 | struct sk_buff *oldest; |
07d78363 | 5881 | |
6312fe77 | 5882 | oldest = list_last_entry(head, struct sk_buff, list); |
07d78363 | 5883 | |
6312fe77 | 5884 | /* We are called with head length >= MAX_GRO_SKBS, so this is |
07d78363 DM |
5885 | * impossible. |
5886 | */ | |
5887 | if (WARN_ON_ONCE(!oldest)) | |
5888 | return; | |
5889 | ||
d9f37d01 LR |
5890 | /* Do not adjust napi->gro_hash[].count, caller is adding a new |
5891 | * SKB to the chain. | |
07d78363 | 5892 | */ |
ece23711 | 5893 | skb_list_del_init(oldest); |
c8079432 | 5894 | napi_gro_complete(napi, oldest); |
07d78363 DM |
5895 | } |
5896 | ||
aaa5d90b PA |
5897 | INDIRECT_CALLABLE_DECLARE(struct sk_buff *inet_gro_receive(struct list_head *, |
5898 | struct sk_buff *)); | |
5899 | INDIRECT_CALLABLE_DECLARE(struct sk_buff *ipv6_gro_receive(struct list_head *, | |
5900 | struct sk_buff *)); | |
bb728820 | 5901 | static enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb) |
d565b0a1 | 5902 | { |
6312fe77 | 5903 | u32 hash = skb_get_hash_raw(skb) & (GRO_HASH_BUCKETS - 1); |
d4546c25 | 5904 | struct list_head *head = &offload_base; |
22061d80 | 5905 | struct packet_offload *ptype; |
d565b0a1 | 5906 | __be16 type = skb->protocol; |
07d78363 | 5907 | struct list_head *gro_head; |
d4546c25 | 5908 | struct sk_buff *pp = NULL; |
5b252f0c | 5909 | enum gro_result ret; |
d4546c25 | 5910 | int same_flow; |
a50e233c | 5911 | int grow; |
d565b0a1 | 5912 | |
b5cdae32 | 5913 | if (netif_elide_gro(skb->dev)) |
d565b0a1 HX |
5914 | goto normal; |
5915 | ||
07d78363 | 5916 | gro_head = gro_list_prepare(napi, skb); |
89c5fa33 | 5917 | |
d565b0a1 HX |
5918 | rcu_read_lock(); |
5919 | list_for_each_entry_rcu(ptype, head, list) { | |
f191a1d1 | 5920 | if (ptype->type != type || !ptype->callbacks.gro_receive) |
d565b0a1 HX |
5921 | continue; |
5922 | ||
86911732 | 5923 | skb_set_network_header(skb, skb_gro_offset(skb)); |
efd9450e | 5924 | skb_reset_mac_len(skb); |
d565b0a1 | 5925 | NAPI_GRO_CB(skb)->same_flow = 0; |
d61d072e | 5926 | NAPI_GRO_CB(skb)->flush = skb_is_gso(skb) || skb_has_frag_list(skb); |
5d38a079 | 5927 | NAPI_GRO_CB(skb)->free = 0; |
fac8e0f5 | 5928 | NAPI_GRO_CB(skb)->encap_mark = 0; |
fcd91dd4 | 5929 | NAPI_GRO_CB(skb)->recursion_counter = 0; |
a0ca153f | 5930 | NAPI_GRO_CB(skb)->is_fou = 0; |
1530545e | 5931 | NAPI_GRO_CB(skb)->is_atomic = 1; |
15e2396d | 5932 | NAPI_GRO_CB(skb)->gro_remcsum_start = 0; |
d565b0a1 | 5933 | |
662880f4 TH |
5934 | /* Setup for GRO checksum validation */ |
5935 | switch (skb->ip_summed) { | |
5936 | case CHECKSUM_COMPLETE: | |
5937 | NAPI_GRO_CB(skb)->csum = skb->csum; | |
5938 | NAPI_GRO_CB(skb)->csum_valid = 1; | |
5939 | NAPI_GRO_CB(skb)->csum_cnt = 0; | |
5940 | break; | |
5941 | case CHECKSUM_UNNECESSARY: | |
5942 | NAPI_GRO_CB(skb)->csum_cnt = skb->csum_level + 1; | |
5943 | NAPI_GRO_CB(skb)->csum_valid = 0; | |
5944 | break; | |
5945 | default: | |
5946 | NAPI_GRO_CB(skb)->csum_cnt = 0; | |
5947 | NAPI_GRO_CB(skb)->csum_valid = 0; | |
5948 | } | |
d565b0a1 | 5949 | |
aaa5d90b PA |
5950 | pp = INDIRECT_CALL_INET(ptype->callbacks.gro_receive, |
5951 | ipv6_gro_receive, inet_gro_receive, | |
5952 | gro_head, skb); | |
d565b0a1 HX |
5953 | break; |
5954 | } | |
5955 | rcu_read_unlock(); | |
5956 | ||
5957 | if (&ptype->list == head) | |
5958 | goto normal; | |
5959 | ||
45586c70 | 5960 | if (PTR_ERR(pp) == -EINPROGRESS) { |
25393d3f SK |
5961 | ret = GRO_CONSUMED; |
5962 | goto ok; | |
5963 | } | |
5964 | ||
0da2afd5 | 5965 | same_flow = NAPI_GRO_CB(skb)->same_flow; |
5d0d9be8 | 5966 | ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED; |
0da2afd5 | 5967 | |
d565b0a1 | 5968 | if (pp) { |
992cba7e | 5969 | skb_list_del_init(pp); |
c8079432 | 5970 | napi_gro_complete(napi, pp); |
6312fe77 | 5971 | napi->gro_hash[hash].count--; |
d565b0a1 HX |
5972 | } |
5973 | ||
0da2afd5 | 5974 | if (same_flow) |
d565b0a1 HX |
5975 | goto ok; |
5976 | ||
600adc18 | 5977 | if (NAPI_GRO_CB(skb)->flush) |
d565b0a1 | 5978 | goto normal; |
d565b0a1 | 5979 | |
6312fe77 | 5980 | if (unlikely(napi->gro_hash[hash].count >= MAX_GRO_SKBS)) { |
c8079432 | 5981 | gro_flush_oldest(napi, gro_head); |
600adc18 | 5982 | } else { |
6312fe77 | 5983 | napi->gro_hash[hash].count++; |
600adc18 | 5984 | } |
d565b0a1 | 5985 | NAPI_GRO_CB(skb)->count = 1; |
2e71a6f8 | 5986 | NAPI_GRO_CB(skb)->age = jiffies; |
29e98242 | 5987 | NAPI_GRO_CB(skb)->last = skb; |
86911732 | 5988 | skb_shinfo(skb)->gso_size = skb_gro_len(skb); |
07d78363 | 5989 | list_add(&skb->list, gro_head); |
5d0d9be8 | 5990 | ret = GRO_HELD; |
d565b0a1 | 5991 | |
ad0f9904 | 5992 | pull: |
a50e233c ED |
5993 | grow = skb_gro_offset(skb) - skb_headlen(skb); |
5994 | if (grow > 0) | |
5995 | gro_pull_from_frag0(skb, grow); | |
d565b0a1 | 5996 | ok: |
d9f37d01 LR |
5997 | if (napi->gro_hash[hash].count) { |
5998 | if (!test_bit(hash, &napi->gro_bitmask)) | |
5999 | __set_bit(hash, &napi->gro_bitmask); | |
6000 | } else if (test_bit(hash, &napi->gro_bitmask)) { | |
6001 | __clear_bit(hash, &napi->gro_bitmask); | |
6002 | } | |
6003 | ||
5d0d9be8 | 6004 | return ret; |
d565b0a1 HX |
6005 | |
6006 | normal: | |
ad0f9904 HX |
6007 | ret = GRO_NORMAL; |
6008 | goto pull; | |
5d38a079 | 6009 | } |
96e93eab | 6010 | |
bf5a755f JC |
6011 | struct packet_offload *gro_find_receive_by_type(__be16 type) |
6012 | { | |
6013 | struct list_head *offload_head = &offload_base; | |
6014 | struct packet_offload *ptype; | |
6015 | ||
6016 | list_for_each_entry_rcu(ptype, offload_head, list) { | |
6017 | if (ptype->type != type || !ptype->callbacks.gro_receive) | |
6018 | continue; | |
6019 | return ptype; | |
6020 | } | |
6021 | return NULL; | |
6022 | } | |
e27a2f83 | 6023 | EXPORT_SYMBOL(gro_find_receive_by_type); |
bf5a755f JC |
6024 | |
6025 | struct packet_offload *gro_find_complete_by_type(__be16 type) | |
6026 | { | |
6027 | struct list_head *offload_head = &offload_base; | |
6028 | struct packet_offload *ptype; | |
6029 | ||
6030 | list_for_each_entry_rcu(ptype, offload_head, list) { | |
6031 | if (ptype->type != type || !ptype->callbacks.gro_complete) | |
6032 | continue; | |
6033 | return ptype; | |
6034 | } | |
6035 | return NULL; | |
6036 | } | |
e27a2f83 | 6037 | EXPORT_SYMBOL(gro_find_complete_by_type); |
5d38a079 | 6038 | |
e44699d2 MK |
6039 | static void napi_skb_free_stolen_head(struct sk_buff *skb) |
6040 | { | |
6041 | skb_dst_drop(skb); | |
174e2381 | 6042 | skb_ext_put(skb); |
e44699d2 MK |
6043 | kmem_cache_free(skbuff_head_cache, skb); |
6044 | } | |
6045 | ||
6570bc79 AL |
6046 | static gro_result_t napi_skb_finish(struct napi_struct *napi, |
6047 | struct sk_buff *skb, | |
6048 | gro_result_t ret) | |
5d38a079 | 6049 | { |
5d0d9be8 HX |
6050 | switch (ret) { |
6051 | case GRO_NORMAL: | |
6570bc79 | 6052 | gro_normal_one(napi, skb); |
c7c4b3b6 | 6053 | break; |
5d38a079 | 6054 | |
5d0d9be8 | 6055 | case GRO_DROP: |
5d38a079 HX |
6056 | kfree_skb(skb); |
6057 | break; | |
5b252f0c | 6058 | |
daa86548 | 6059 | case GRO_MERGED_FREE: |
e44699d2 MK |
6060 | if (NAPI_GRO_CB(skb)->free == NAPI_GRO_FREE_STOLEN_HEAD) |
6061 | napi_skb_free_stolen_head(skb); | |
6062 | else | |
d7e8883c | 6063 | __kfree_skb(skb); |
daa86548 ED |
6064 | break; |
6065 | ||
5b252f0c BH |
6066 | case GRO_HELD: |
6067 | case GRO_MERGED: | |
25393d3f | 6068 | case GRO_CONSUMED: |
5b252f0c | 6069 | break; |
5d38a079 HX |
6070 | } |
6071 | ||
c7c4b3b6 | 6072 | return ret; |
5d0d9be8 | 6073 | } |
5d0d9be8 | 6074 | |
c7c4b3b6 | 6075 | gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb) |
5d0d9be8 | 6076 | { |
b0e3f1bd GB |
6077 | gro_result_t ret; |
6078 | ||
93f93a44 | 6079 | skb_mark_napi_id(skb, napi); |
ae78dbfa | 6080 | trace_napi_gro_receive_entry(skb); |
86911732 | 6081 | |
a50e233c ED |
6082 | skb_gro_reset_offset(skb); |
6083 | ||
6570bc79 | 6084 | ret = napi_skb_finish(napi, skb, dev_gro_receive(napi, skb)); |
b0e3f1bd GB |
6085 | trace_napi_gro_receive_exit(ret); |
6086 | ||
6087 | return ret; | |
d565b0a1 HX |
6088 | } |
6089 | EXPORT_SYMBOL(napi_gro_receive); | |
6090 | ||
d0c2b0d2 | 6091 | static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb) |
96e93eab | 6092 | { |
93a35f59 ED |
6093 | if (unlikely(skb->pfmemalloc)) { |
6094 | consume_skb(skb); | |
6095 | return; | |
6096 | } | |
96e93eab | 6097 | __skb_pull(skb, skb_headlen(skb)); |
2a2a459e ED |
6098 | /* restore the reserve we had after netdev_alloc_skb_ip_align() */ |
6099 | skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN - skb_headroom(skb)); | |
b1817524 | 6100 | __vlan_hwaccel_clear_tag(skb); |
66c46d74 | 6101 | skb->dev = napi->dev; |
6d152e23 | 6102 | skb->skb_iif = 0; |
33d9a2c7 ED |
6103 | |
6104 | /* eth_type_trans() assumes pkt_type is PACKET_HOST */ | |
6105 | skb->pkt_type = PACKET_HOST; | |
6106 | ||
c3caf119 JC |
6107 | skb->encapsulation = 0; |
6108 | skb_shinfo(skb)->gso_type = 0; | |
e33d0ba8 | 6109 | skb->truesize = SKB_TRUESIZE(skb_end_offset(skb)); |
174e2381 | 6110 | skb_ext_reset(skb); |
96e93eab HX |
6111 | |
6112 | napi->skb = skb; | |
6113 | } | |
96e93eab | 6114 | |
76620aaf | 6115 | struct sk_buff *napi_get_frags(struct napi_struct *napi) |
5d38a079 | 6116 | { |
5d38a079 | 6117 | struct sk_buff *skb = napi->skb; |
5d38a079 HX |
6118 | |
6119 | if (!skb) { | |
fd11a83d | 6120 | skb = napi_alloc_skb(napi, GRO_MAX_HEAD); |
e2f9dc3b ED |
6121 | if (skb) { |
6122 | napi->skb = skb; | |
6123 | skb_mark_napi_id(skb, napi); | |
6124 | } | |
80595d59 | 6125 | } |
96e93eab HX |
6126 | return skb; |
6127 | } | |
76620aaf | 6128 | EXPORT_SYMBOL(napi_get_frags); |
96e93eab | 6129 | |
a50e233c ED |
6130 | static gro_result_t napi_frags_finish(struct napi_struct *napi, |
6131 | struct sk_buff *skb, | |
6132 | gro_result_t ret) | |
96e93eab | 6133 | { |
5d0d9be8 HX |
6134 | switch (ret) { |
6135 | case GRO_NORMAL: | |
a50e233c ED |
6136 | case GRO_HELD: |
6137 | __skb_push(skb, ETH_HLEN); | |
6138 | skb->protocol = eth_type_trans(skb, skb->dev); | |
323ebb61 EC |
6139 | if (ret == GRO_NORMAL) |
6140 | gro_normal_one(napi, skb); | |
86911732 | 6141 | break; |
5d38a079 | 6142 | |
5d0d9be8 | 6143 | case GRO_DROP: |
5d0d9be8 HX |
6144 | napi_reuse_skb(napi, skb); |
6145 | break; | |
5b252f0c | 6146 | |
e44699d2 MK |
6147 | case GRO_MERGED_FREE: |
6148 | if (NAPI_GRO_CB(skb)->free == NAPI_GRO_FREE_STOLEN_HEAD) | |
6149 | napi_skb_free_stolen_head(skb); | |
6150 | else | |
6151 | napi_reuse_skb(napi, skb); | |
6152 | break; | |
6153 | ||
5b252f0c | 6154 | case GRO_MERGED: |
25393d3f | 6155 | case GRO_CONSUMED: |
5b252f0c | 6156 | break; |
5d0d9be8 | 6157 | } |
5d38a079 | 6158 | |
c7c4b3b6 | 6159 | return ret; |
5d38a079 | 6160 | } |
5d0d9be8 | 6161 | |
a50e233c ED |
6162 | /* Upper GRO stack assumes network header starts at gro_offset=0 |
6163 | * Drivers could call both napi_gro_frags() and napi_gro_receive() | |
6164 | * We copy ethernet header into skb->data to have a common layout. | |
6165 | */ | |
4adb9c4a | 6166 | static struct sk_buff *napi_frags_skb(struct napi_struct *napi) |
76620aaf HX |
6167 | { |
6168 | struct sk_buff *skb = napi->skb; | |
a50e233c ED |
6169 | const struct ethhdr *eth; |
6170 | unsigned int hlen = sizeof(*eth); | |
76620aaf HX |
6171 | |
6172 | napi->skb = NULL; | |
6173 | ||
a50e233c ED |
6174 | skb_reset_mac_header(skb); |
6175 | skb_gro_reset_offset(skb); | |
6176 | ||
a50e233c ED |
6177 | if (unlikely(skb_gro_header_hard(skb, hlen))) { |
6178 | eth = skb_gro_header_slow(skb, hlen, 0); | |
6179 | if (unlikely(!eth)) { | |
4da46ceb AC |
6180 | net_warn_ratelimited("%s: dropping impossible skb from %s\n", |
6181 | __func__, napi->dev->name); | |
a50e233c ED |
6182 | napi_reuse_skb(napi, skb); |
6183 | return NULL; | |
6184 | } | |
6185 | } else { | |
a4270d67 | 6186 | eth = (const struct ethhdr *)skb->data; |
a50e233c ED |
6187 | gro_pull_from_frag0(skb, hlen); |
6188 | NAPI_GRO_CB(skb)->frag0 += hlen; | |
6189 | NAPI_GRO_CB(skb)->frag0_len -= hlen; | |
76620aaf | 6190 | } |
a50e233c ED |
6191 | __skb_pull(skb, hlen); |
6192 | ||
6193 | /* | |
6194 | * This works because the only protocols we care about don't require | |
6195 | * special handling. | |
6196 | * We'll fix it up properly in napi_frags_finish() | |
6197 | */ | |
6198 | skb->protocol = eth->h_proto; | |
76620aaf | 6199 | |
76620aaf HX |
6200 | return skb; |
6201 | } | |
76620aaf | 6202 | |
c7c4b3b6 | 6203 | gro_result_t napi_gro_frags(struct napi_struct *napi) |
5d0d9be8 | 6204 | { |
b0e3f1bd | 6205 | gro_result_t ret; |
76620aaf | 6206 | struct sk_buff *skb = napi_frags_skb(napi); |
5d0d9be8 HX |
6207 | |
6208 | if (!skb) | |
c7c4b3b6 | 6209 | return GRO_DROP; |
5d0d9be8 | 6210 | |
ae78dbfa BH |
6211 | trace_napi_gro_frags_entry(skb); |
6212 | ||
b0e3f1bd GB |
6213 | ret = napi_frags_finish(napi, skb, dev_gro_receive(napi, skb)); |
6214 | trace_napi_gro_frags_exit(ret); | |
6215 | ||
6216 | return ret; | |
5d0d9be8 | 6217 | } |
5d38a079 HX |
6218 | EXPORT_SYMBOL(napi_gro_frags); |
6219 | ||
573e8fca TH |
6220 | /* Compute the checksum from gro_offset and return the folded value |
6221 | * after adding in any pseudo checksum. | |
6222 | */ | |
6223 | __sum16 __skb_gro_checksum_complete(struct sk_buff *skb) | |
6224 | { | |
6225 | __wsum wsum; | |
6226 | __sum16 sum; | |
6227 | ||
6228 | wsum = skb_checksum(skb, skb_gro_offset(skb), skb_gro_len(skb), 0); | |
6229 | ||
6230 | /* NAPI_GRO_CB(skb)->csum holds pseudo checksum */ | |
6231 | sum = csum_fold(csum_add(NAPI_GRO_CB(skb)->csum, wsum)); | |
14641931 | 6232 | /* See comments in __skb_checksum_complete(). */ |
573e8fca TH |
6233 | if (likely(!sum)) { |
6234 | if (unlikely(skb->ip_summed == CHECKSUM_COMPLETE) && | |
6235 | !skb->csum_complete_sw) | |
7fe50ac8 | 6236 | netdev_rx_csum_fault(skb->dev, skb); |
573e8fca TH |
6237 | } |
6238 | ||
6239 | NAPI_GRO_CB(skb)->csum = wsum; | |
6240 | NAPI_GRO_CB(skb)->csum_valid = 1; | |
6241 | ||
6242 | return sum; | |
6243 | } | |
6244 | EXPORT_SYMBOL(__skb_gro_checksum_complete); | |
6245 | ||
773fc8f6 | 6246 | static void net_rps_send_ipi(struct softnet_data *remsd) |
6247 | { | |
6248 | #ifdef CONFIG_RPS | |
6249 | while (remsd) { | |
6250 | struct softnet_data *next = remsd->rps_ipi_next; | |
6251 | ||
6252 | if (cpu_online(remsd->cpu)) | |
6253 | smp_call_function_single_async(remsd->cpu, &remsd->csd); | |
6254 | remsd = next; | |
6255 | } | |
6256 | #endif | |
6257 | } | |
6258 | ||
e326bed2 | 6259 | /* |
855abcf0 | 6260 | * net_rps_action_and_irq_enable sends any pending IPI's for rps. |
e326bed2 ED |
6261 | * Note: called with local irq disabled, but exits with local irq enabled. |
6262 | */ | |
6263 | static void net_rps_action_and_irq_enable(struct softnet_data *sd) | |
6264 | { | |
6265 | #ifdef CONFIG_RPS | |
6266 | struct softnet_data *remsd = sd->rps_ipi_list; | |
6267 | ||
6268 | if (remsd) { | |
6269 | sd->rps_ipi_list = NULL; | |
6270 | ||
6271 | local_irq_enable(); | |
6272 | ||
6273 | /* Send pending IPI's to kick RPS processing on remote cpus. */ | |
773fc8f6 | 6274 | net_rps_send_ipi(remsd); |
e326bed2 ED |
6275 | } else |
6276 | #endif | |
6277 | local_irq_enable(); | |
6278 | } | |
6279 | ||
d75b1ade ED |
6280 | static bool sd_has_rps_ipi_waiting(struct softnet_data *sd) |
6281 | { | |
6282 | #ifdef CONFIG_RPS | |
6283 | return sd->rps_ipi_list != NULL; | |
6284 | #else | |
6285 | return false; | |
6286 | #endif | |
6287 | } | |
6288 | ||
bea3348e | 6289 | static int process_backlog(struct napi_struct *napi, int quota) |
1da177e4 | 6290 | { |
eecfd7c4 | 6291 | struct softnet_data *sd = container_of(napi, struct softnet_data, backlog); |
145dd5f9 PA |
6292 | bool again = true; |
6293 | int work = 0; | |
1da177e4 | 6294 | |
e326bed2 ED |
6295 | /* Check if we have pending ipi, its better to send them now, |
6296 | * not waiting net_rx_action() end. | |
6297 | */ | |
d75b1ade | 6298 | if (sd_has_rps_ipi_waiting(sd)) { |
e326bed2 ED |
6299 | local_irq_disable(); |
6300 | net_rps_action_and_irq_enable(sd); | |
6301 | } | |
d75b1ade | 6302 | |
3d48b53f | 6303 | napi->weight = dev_rx_weight; |
145dd5f9 | 6304 | while (again) { |
1da177e4 | 6305 | struct sk_buff *skb; |
6e7676c1 CG |
6306 | |
6307 | while ((skb = __skb_dequeue(&sd->process_queue))) { | |
2c17d27c | 6308 | rcu_read_lock(); |
6e7676c1 | 6309 | __netif_receive_skb(skb); |
2c17d27c | 6310 | rcu_read_unlock(); |
76cc8b13 | 6311 | input_queue_head_incr(sd); |
145dd5f9 | 6312 | if (++work >= quota) |
76cc8b13 | 6313 | return work; |
145dd5f9 | 6314 | |
6e7676c1 | 6315 | } |
1da177e4 | 6316 | |
145dd5f9 | 6317 | local_irq_disable(); |
e36fa2f7 | 6318 | rps_lock(sd); |
11ef7a89 | 6319 | if (skb_queue_empty(&sd->input_pkt_queue)) { |
eecfd7c4 ED |
6320 | /* |
6321 | * Inline a custom version of __napi_complete(). | |
6322 | * only current cpu owns and manipulates this napi, | |
11ef7a89 TH |
6323 | * and NAPI_STATE_SCHED is the only possible flag set |
6324 | * on backlog. | |
6325 | * We can use a plain write instead of clear_bit(), | |
eecfd7c4 ED |
6326 | * and we dont need an smp_mb() memory barrier. |
6327 | */ | |
eecfd7c4 | 6328 | napi->state = 0; |
145dd5f9 PA |
6329 | again = false; |
6330 | } else { | |
6331 | skb_queue_splice_tail_init(&sd->input_pkt_queue, | |
6332 | &sd->process_queue); | |
bea3348e | 6333 | } |
e36fa2f7 | 6334 | rps_unlock(sd); |
145dd5f9 | 6335 | local_irq_enable(); |
6e7676c1 | 6336 | } |
1da177e4 | 6337 | |
bea3348e SH |
6338 | return work; |
6339 | } | |
1da177e4 | 6340 | |
bea3348e SH |
6341 | /** |
6342 | * __napi_schedule - schedule for receive | |
c4ea43c5 | 6343 | * @n: entry to schedule |
bea3348e | 6344 | * |
bc9ad166 ED |
6345 | * The entry's receive function will be scheduled to run. |
6346 | * Consider using __napi_schedule_irqoff() if hard irqs are masked. | |
bea3348e | 6347 | */ |
b5606c2d | 6348 | void __napi_schedule(struct napi_struct *n) |
bea3348e SH |
6349 | { |
6350 | unsigned long flags; | |
1da177e4 | 6351 | |
bea3348e | 6352 | local_irq_save(flags); |
903ceff7 | 6353 | ____napi_schedule(this_cpu_ptr(&softnet_data), n); |
bea3348e | 6354 | local_irq_restore(flags); |
1da177e4 | 6355 | } |
bea3348e SH |
6356 | EXPORT_SYMBOL(__napi_schedule); |
6357 | ||
39e6c820 ED |
6358 | /** |
6359 | * napi_schedule_prep - check if napi can be scheduled | |
6360 | * @n: napi context | |
6361 | * | |
6362 | * Test if NAPI routine is already running, and if not mark | |
ee1a4c84 | 6363 | * it as running. This is used as a condition variable to |
39e6c820 ED |
6364 | * insure only one NAPI poll instance runs. We also make |
6365 | * sure there is no pending NAPI disable. | |
6366 | */ | |
6367 | bool napi_schedule_prep(struct napi_struct *n) | |
6368 | { | |
6369 | unsigned long val, new; | |
6370 | ||
6371 | do { | |
6372 | val = READ_ONCE(n->state); | |
6373 | if (unlikely(val & NAPIF_STATE_DISABLE)) | |
6374 | return false; | |
6375 | new = val | NAPIF_STATE_SCHED; | |
6376 | ||
6377 | /* Sets STATE_MISSED bit if STATE_SCHED was already set | |
6378 | * This was suggested by Alexander Duyck, as compiler | |
6379 | * emits better code than : | |
6380 | * if (val & NAPIF_STATE_SCHED) | |
6381 | * new |= NAPIF_STATE_MISSED; | |
6382 | */ | |
6383 | new |= (val & NAPIF_STATE_SCHED) / NAPIF_STATE_SCHED * | |
6384 | NAPIF_STATE_MISSED; | |
6385 | } while (cmpxchg(&n->state, val, new) != val); | |
6386 | ||
6387 | return !(val & NAPIF_STATE_SCHED); | |
6388 | } | |
6389 | EXPORT_SYMBOL(napi_schedule_prep); | |
6390 | ||
bc9ad166 ED |
6391 | /** |
6392 | * __napi_schedule_irqoff - schedule for receive | |
6393 | * @n: entry to schedule | |
6394 | * | |
6395 | * Variant of __napi_schedule() assuming hard irqs are masked | |
6396 | */ | |
6397 | void __napi_schedule_irqoff(struct napi_struct *n) | |
6398 | { | |
6399 | ____napi_schedule(this_cpu_ptr(&softnet_data), n); | |
6400 | } | |
6401 | EXPORT_SYMBOL(__napi_schedule_irqoff); | |
6402 | ||
364b6055 | 6403 | bool napi_complete_done(struct napi_struct *n, int work_done) |
d565b0a1 | 6404 | { |
6f8b12d6 ED |
6405 | unsigned long flags, val, new, timeout = 0; |
6406 | bool ret = true; | |
d565b0a1 HX |
6407 | |
6408 | /* | |
217f6974 ED |
6409 | * 1) Don't let napi dequeue from the cpu poll list |
6410 | * just in case its running on a different cpu. | |
6411 | * 2) If we are busy polling, do nothing here, we have | |
6412 | * the guarantee we will be called later. | |
d565b0a1 | 6413 | */ |
217f6974 ED |
6414 | if (unlikely(n->state & (NAPIF_STATE_NPSVC | |
6415 | NAPIF_STATE_IN_BUSY_POLL))) | |
364b6055 | 6416 | return false; |
d565b0a1 | 6417 | |
6f8b12d6 ED |
6418 | if (work_done) { |
6419 | if (n->gro_bitmask) | |
7e417a66 ED |
6420 | timeout = READ_ONCE(n->dev->gro_flush_timeout); |
6421 | n->defer_hard_irqs_count = READ_ONCE(n->dev->napi_defer_hard_irqs); | |
6f8b12d6 ED |
6422 | } |
6423 | if (n->defer_hard_irqs_count > 0) { | |
6424 | n->defer_hard_irqs_count--; | |
7e417a66 | 6425 | timeout = READ_ONCE(n->dev->gro_flush_timeout); |
6f8b12d6 ED |
6426 | if (timeout) |
6427 | ret = false; | |
6428 | } | |
6429 | if (n->gro_bitmask) { | |
605108ac PA |
6430 | /* When the NAPI instance uses a timeout and keeps postponing |
6431 | * it, we need to bound somehow the time packets are kept in | |
6432 | * the GRO layer | |
6433 | */ | |
6434 | napi_gro_flush(n, !!timeout); | |
3b47d303 | 6435 | } |
c8079432 MM |
6436 | |
6437 | gro_normal_list(n); | |
6438 | ||
02c1602e | 6439 | if (unlikely(!list_empty(&n->poll_list))) { |
d75b1ade ED |
6440 | /* If n->poll_list is not empty, we need to mask irqs */ |
6441 | local_irq_save(flags); | |
02c1602e | 6442 | list_del_init(&n->poll_list); |
d75b1ade ED |
6443 | local_irq_restore(flags); |
6444 | } | |
39e6c820 ED |
6445 | |
6446 | do { | |
6447 | val = READ_ONCE(n->state); | |
6448 | ||
6449 | WARN_ON_ONCE(!(val & NAPIF_STATE_SCHED)); | |
6450 | ||
7fd3253a BT |
6451 | new = val & ~(NAPIF_STATE_MISSED | NAPIF_STATE_SCHED | |
6452 | NAPIF_STATE_PREFER_BUSY_POLL); | |
39e6c820 ED |
6453 | |
6454 | /* If STATE_MISSED was set, leave STATE_SCHED set, | |
6455 | * because we will call napi->poll() one more time. | |
6456 | * This C code was suggested by Alexander Duyck to help gcc. | |
6457 | */ | |
6458 | new |= (val & NAPIF_STATE_MISSED) / NAPIF_STATE_MISSED * | |
6459 | NAPIF_STATE_SCHED; | |
6460 | } while (cmpxchg(&n->state, val, new) != val); | |
6461 | ||
6462 | if (unlikely(val & NAPIF_STATE_MISSED)) { | |
6463 | __napi_schedule(n); | |
6464 | return false; | |
6465 | } | |
6466 | ||
6f8b12d6 ED |
6467 | if (timeout) |
6468 | hrtimer_start(&n->timer, ns_to_ktime(timeout), | |
6469 | HRTIMER_MODE_REL_PINNED); | |
6470 | return ret; | |
d565b0a1 | 6471 | } |
3b47d303 | 6472 | EXPORT_SYMBOL(napi_complete_done); |
d565b0a1 | 6473 | |
af12fa6e | 6474 | /* must be called under rcu_read_lock(), as we dont take a reference */ |
02d62e86 | 6475 | static struct napi_struct *napi_by_id(unsigned int napi_id) |
af12fa6e ET |
6476 | { |
6477 | unsigned int hash = napi_id % HASH_SIZE(napi_hash); | |
6478 | struct napi_struct *napi; | |
6479 | ||
6480 | hlist_for_each_entry_rcu(napi, &napi_hash[hash], napi_hash_node) | |
6481 | if (napi->napi_id == napi_id) | |
6482 | return napi; | |
6483 | ||
6484 | return NULL; | |
6485 | } | |
02d62e86 ED |
6486 | |
6487 | #if defined(CONFIG_NET_RX_BUSY_POLL) | |
217f6974 | 6488 | |
7fd3253a | 6489 | static void __busy_poll_stop(struct napi_struct *napi, bool skip_schedule) |
217f6974 | 6490 | { |
7fd3253a BT |
6491 | if (!skip_schedule) { |
6492 | gro_normal_list(napi); | |
6493 | __napi_schedule(napi); | |
6494 | return; | |
6495 | } | |
217f6974 | 6496 | |
7fd3253a BT |
6497 | if (napi->gro_bitmask) { |
6498 | /* flush too old packets | |
6499 | * If HZ < 1000, flush all packets. | |
6500 | */ | |
6501 | napi_gro_flush(napi, HZ >= 1000); | |
6502 | } | |
217f6974 | 6503 | |
7fd3253a BT |
6504 | gro_normal_list(napi); |
6505 | clear_bit(NAPI_STATE_SCHED, &napi->state); | |
6506 | } | |
6507 | ||
7c951caf BT |
6508 | static void busy_poll_stop(struct napi_struct *napi, void *have_poll_lock, bool prefer_busy_poll, |
6509 | u16 budget) | |
217f6974 | 6510 | { |
7fd3253a BT |
6511 | bool skip_schedule = false; |
6512 | unsigned long timeout; | |
217f6974 ED |
6513 | int rc; |
6514 | ||
39e6c820 ED |
6515 | /* Busy polling means there is a high chance device driver hard irq |
6516 | * could not grab NAPI_STATE_SCHED, and that NAPI_STATE_MISSED was | |
6517 | * set in napi_schedule_prep(). | |
6518 | * Since we are about to call napi->poll() once more, we can safely | |
6519 | * clear NAPI_STATE_MISSED. | |
6520 | * | |
6521 | * Note: x86 could use a single "lock and ..." instruction | |
6522 | * to perform these two clear_bit() | |
6523 | */ | |
6524 | clear_bit(NAPI_STATE_MISSED, &napi->state); | |
217f6974 ED |
6525 | clear_bit(NAPI_STATE_IN_BUSY_POLL, &napi->state); |
6526 | ||
6527 | local_bh_disable(); | |
6528 | ||
7fd3253a BT |
6529 | if (prefer_busy_poll) { |
6530 | napi->defer_hard_irqs_count = READ_ONCE(napi->dev->napi_defer_hard_irqs); | |
6531 | timeout = READ_ONCE(napi->dev->gro_flush_timeout); | |
6532 | if (napi->defer_hard_irqs_count && timeout) { | |
6533 | hrtimer_start(&napi->timer, ns_to_ktime(timeout), HRTIMER_MODE_REL_PINNED); | |
6534 | skip_schedule = true; | |
6535 | } | |
6536 | } | |
6537 | ||
217f6974 ED |
6538 | /* All we really want here is to re-enable device interrupts. |
6539 | * Ideally, a new ndo_busy_poll_stop() could avoid another round. | |
6540 | */ | |
7c951caf | 6541 | rc = napi->poll(napi, budget); |
323ebb61 EC |
6542 | /* We can't gro_normal_list() here, because napi->poll() might have |
6543 | * rearmed the napi (napi_complete_done()) in which case it could | |
6544 | * already be running on another CPU. | |
6545 | */ | |
7c951caf | 6546 | trace_napi_poll(napi, rc, budget); |
217f6974 | 6547 | netpoll_poll_unlock(have_poll_lock); |
7c951caf | 6548 | if (rc == budget) |
7fd3253a | 6549 | __busy_poll_stop(napi, skip_schedule); |
217f6974 | 6550 | local_bh_enable(); |
217f6974 ED |
6551 | } |
6552 | ||
7db6b048 SS |
6553 | void napi_busy_loop(unsigned int napi_id, |
6554 | bool (*loop_end)(void *, unsigned long), | |
7c951caf | 6555 | void *loop_end_arg, bool prefer_busy_poll, u16 budget) |
02d62e86 | 6556 | { |
7db6b048 | 6557 | unsigned long start_time = loop_end ? busy_loop_current_time() : 0; |
217f6974 | 6558 | int (*napi_poll)(struct napi_struct *napi, int budget); |
217f6974 | 6559 | void *have_poll_lock = NULL; |
02d62e86 | 6560 | struct napi_struct *napi; |
217f6974 ED |
6561 | |
6562 | restart: | |
217f6974 | 6563 | napi_poll = NULL; |
02d62e86 | 6564 | |
2a028ecb | 6565 | rcu_read_lock(); |
02d62e86 | 6566 | |
545cd5e5 | 6567 | napi = napi_by_id(napi_id); |
02d62e86 ED |
6568 | if (!napi) |
6569 | goto out; | |
6570 | ||
217f6974 ED |
6571 | preempt_disable(); |
6572 | for (;;) { | |
2b5cd0df AD |
6573 | int work = 0; |
6574 | ||
2a028ecb | 6575 | local_bh_disable(); |
217f6974 ED |
6576 | if (!napi_poll) { |
6577 | unsigned long val = READ_ONCE(napi->state); | |
6578 | ||
6579 | /* If multiple threads are competing for this napi, | |
6580 | * we avoid dirtying napi->state as much as we can. | |
6581 | */ | |
6582 | if (val & (NAPIF_STATE_DISABLE | NAPIF_STATE_SCHED | | |
7fd3253a BT |
6583 | NAPIF_STATE_IN_BUSY_POLL)) { |
6584 | if (prefer_busy_poll) | |
6585 | set_bit(NAPI_STATE_PREFER_BUSY_POLL, &napi->state); | |
217f6974 | 6586 | goto count; |
7fd3253a | 6587 | } |
217f6974 ED |
6588 | if (cmpxchg(&napi->state, val, |
6589 | val | NAPIF_STATE_IN_BUSY_POLL | | |
7fd3253a BT |
6590 | NAPIF_STATE_SCHED) != val) { |
6591 | if (prefer_busy_poll) | |
6592 | set_bit(NAPI_STATE_PREFER_BUSY_POLL, &napi->state); | |
217f6974 | 6593 | goto count; |
7fd3253a | 6594 | } |
217f6974 ED |
6595 | have_poll_lock = netpoll_poll_lock(napi); |
6596 | napi_poll = napi->poll; | |
6597 | } | |
7c951caf BT |
6598 | work = napi_poll(napi, budget); |
6599 | trace_napi_poll(napi, work, budget); | |
323ebb61 | 6600 | gro_normal_list(napi); |
217f6974 | 6601 | count: |
2b5cd0df | 6602 | if (work > 0) |
7db6b048 | 6603 | __NET_ADD_STATS(dev_net(napi->dev), |
2b5cd0df | 6604 | LINUX_MIB_BUSYPOLLRXPACKETS, work); |
2a028ecb | 6605 | local_bh_enable(); |
02d62e86 | 6606 | |
7db6b048 | 6607 | if (!loop_end || loop_end(loop_end_arg, start_time)) |
217f6974 | 6608 | break; |
02d62e86 | 6609 | |
217f6974 ED |
6610 | if (unlikely(need_resched())) { |
6611 | if (napi_poll) | |
7c951caf | 6612 | busy_poll_stop(napi, have_poll_lock, prefer_busy_poll, budget); |
217f6974 ED |
6613 | preempt_enable(); |
6614 | rcu_read_unlock(); | |
6615 | cond_resched(); | |
7db6b048 | 6616 | if (loop_end(loop_end_arg, start_time)) |
2b5cd0df | 6617 | return; |
217f6974 ED |
6618 | goto restart; |
6619 | } | |
6cdf89b1 | 6620 | cpu_relax(); |
217f6974 ED |
6621 | } |
6622 | if (napi_poll) | |
7c951caf | 6623 | busy_poll_stop(napi, have_poll_lock, prefer_busy_poll, budget); |
217f6974 | 6624 | preempt_enable(); |
02d62e86 | 6625 | out: |
2a028ecb | 6626 | rcu_read_unlock(); |
02d62e86 | 6627 | } |
7db6b048 | 6628 | EXPORT_SYMBOL(napi_busy_loop); |
02d62e86 ED |
6629 | |
6630 | #endif /* CONFIG_NET_RX_BUSY_POLL */ | |
af12fa6e | 6631 | |
149d6ad8 | 6632 | static void napi_hash_add(struct napi_struct *napi) |
af12fa6e | 6633 | { |
4d092dd2 | 6634 | if (test_bit(NAPI_STATE_NO_BUSY_POLL, &napi->state)) |
52bd2d62 | 6635 | return; |
af12fa6e | 6636 | |
52bd2d62 | 6637 | spin_lock(&napi_hash_lock); |
af12fa6e | 6638 | |
545cd5e5 | 6639 | /* 0..NR_CPUS range is reserved for sender_cpu use */ |
52bd2d62 | 6640 | do { |
545cd5e5 AD |
6641 | if (unlikely(++napi_gen_id < MIN_NAPI_ID)) |
6642 | napi_gen_id = MIN_NAPI_ID; | |
52bd2d62 ED |
6643 | } while (napi_by_id(napi_gen_id)); |
6644 | napi->napi_id = napi_gen_id; | |
af12fa6e | 6645 | |
52bd2d62 ED |
6646 | hlist_add_head_rcu(&napi->napi_hash_node, |
6647 | &napi_hash[napi->napi_id % HASH_SIZE(napi_hash)]); | |
af12fa6e | 6648 | |
52bd2d62 | 6649 | spin_unlock(&napi_hash_lock); |
af12fa6e | 6650 | } |
af12fa6e ET |
6651 | |
6652 | /* Warning : caller is responsible to make sure rcu grace period | |
6653 | * is respected before freeing memory containing @napi | |
6654 | */ | |
5198d545 | 6655 | static void napi_hash_del(struct napi_struct *napi) |
af12fa6e ET |
6656 | { |
6657 | spin_lock(&napi_hash_lock); | |
6658 | ||
4d092dd2 | 6659 | hlist_del_init_rcu(&napi->napi_hash_node); |
5198d545 | 6660 | |
af12fa6e ET |
6661 | spin_unlock(&napi_hash_lock); |
6662 | } | |
af12fa6e | 6663 | |
3b47d303 ED |
6664 | static enum hrtimer_restart napi_watchdog(struct hrtimer *timer) |
6665 | { | |
6666 | struct napi_struct *napi; | |
6667 | ||
6668 | napi = container_of(timer, struct napi_struct, timer); | |
39e6c820 ED |
6669 | |
6670 | /* Note : we use a relaxed variant of napi_schedule_prep() not setting | |
6671 | * NAPI_STATE_MISSED, since we do not react to a device IRQ. | |
6672 | */ | |
6f8b12d6 | 6673 | if (!napi_disable_pending(napi) && |
7fd3253a BT |
6674 | !test_and_set_bit(NAPI_STATE_SCHED, &napi->state)) { |
6675 | clear_bit(NAPI_STATE_PREFER_BUSY_POLL, &napi->state); | |
39e6c820 | 6676 | __napi_schedule_irqoff(napi); |
7fd3253a | 6677 | } |
3b47d303 ED |
6678 | |
6679 | return HRTIMER_NORESTART; | |
6680 | } | |
6681 | ||
7c4ec749 | 6682 | static void init_gro_hash(struct napi_struct *napi) |
d565b0a1 | 6683 | { |
07d78363 DM |
6684 | int i; |
6685 | ||
6312fe77 LR |
6686 | for (i = 0; i < GRO_HASH_BUCKETS; i++) { |
6687 | INIT_LIST_HEAD(&napi->gro_hash[i].list); | |
6688 | napi->gro_hash[i].count = 0; | |
6689 | } | |
7c4ec749 DM |
6690 | napi->gro_bitmask = 0; |
6691 | } | |
6692 | ||
6693 | void netif_napi_add(struct net_device *dev, struct napi_struct *napi, | |
6694 | int (*poll)(struct napi_struct *, int), int weight) | |
6695 | { | |
4d092dd2 JK |
6696 | if (WARN_ON(test_and_set_bit(NAPI_STATE_LISTED, &napi->state))) |
6697 | return; | |
6698 | ||
7c4ec749 | 6699 | INIT_LIST_HEAD(&napi->poll_list); |
4d092dd2 | 6700 | INIT_HLIST_NODE(&napi->napi_hash_node); |
7c4ec749 DM |
6701 | hrtimer_init(&napi->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_PINNED); |
6702 | napi->timer.function = napi_watchdog; | |
6703 | init_gro_hash(napi); | |
5d38a079 | 6704 | napi->skb = NULL; |
323ebb61 EC |
6705 | INIT_LIST_HEAD(&napi->rx_list); |
6706 | napi->rx_count = 0; | |
d565b0a1 | 6707 | napi->poll = poll; |
82dc3c63 | 6708 | if (weight > NAPI_POLL_WEIGHT) |
bf29e9e9 QC |
6709 | netdev_err_once(dev, "%s() called with weight %d\n", __func__, |
6710 | weight); | |
d565b0a1 | 6711 | napi->weight = weight; |
d565b0a1 | 6712 | napi->dev = dev; |
5d38a079 | 6713 | #ifdef CONFIG_NETPOLL |
d565b0a1 HX |
6714 | napi->poll_owner = -1; |
6715 | #endif | |
6716 | set_bit(NAPI_STATE_SCHED, &napi->state); | |
96e97bc0 JK |
6717 | set_bit(NAPI_STATE_NPSVC, &napi->state); |
6718 | list_add_rcu(&napi->dev_list, &dev->napi_list); | |
93d05d4a | 6719 | napi_hash_add(napi); |
d565b0a1 HX |
6720 | } |
6721 | EXPORT_SYMBOL(netif_napi_add); | |
6722 | ||
3b47d303 ED |
6723 | void napi_disable(struct napi_struct *n) |
6724 | { | |
6725 | might_sleep(); | |
6726 | set_bit(NAPI_STATE_DISABLE, &n->state); | |
6727 | ||
6728 | while (test_and_set_bit(NAPI_STATE_SCHED, &n->state)) | |
6729 | msleep(1); | |
2d8bff12 NH |
6730 | while (test_and_set_bit(NAPI_STATE_NPSVC, &n->state)) |
6731 | msleep(1); | |
3b47d303 ED |
6732 | |
6733 | hrtimer_cancel(&n->timer); | |
6734 | ||
7fd3253a | 6735 | clear_bit(NAPI_STATE_PREFER_BUSY_POLL, &n->state); |
3b47d303 ED |
6736 | clear_bit(NAPI_STATE_DISABLE, &n->state); |
6737 | } | |
6738 | EXPORT_SYMBOL(napi_disable); | |
6739 | ||
07d78363 | 6740 | static void flush_gro_hash(struct napi_struct *napi) |
d4546c25 | 6741 | { |
07d78363 | 6742 | int i; |
d4546c25 | 6743 | |
07d78363 DM |
6744 | for (i = 0; i < GRO_HASH_BUCKETS; i++) { |
6745 | struct sk_buff *skb, *n; | |
6746 | ||
6312fe77 | 6747 | list_for_each_entry_safe(skb, n, &napi->gro_hash[i].list, list) |
07d78363 | 6748 | kfree_skb(skb); |
6312fe77 | 6749 | napi->gro_hash[i].count = 0; |
07d78363 | 6750 | } |
d4546c25 DM |
6751 | } |
6752 | ||
93d05d4a | 6753 | /* Must be called in process context */ |
5198d545 | 6754 | void __netif_napi_del(struct napi_struct *napi) |
d565b0a1 | 6755 | { |
4d092dd2 JK |
6756 | if (!test_and_clear_bit(NAPI_STATE_LISTED, &napi->state)) |
6757 | return; | |
6758 | ||
5198d545 | 6759 | napi_hash_del(napi); |
5251ef82 | 6760 | list_del_rcu(&napi->dev_list); |
76620aaf | 6761 | napi_free_frags(napi); |
d565b0a1 | 6762 | |
07d78363 | 6763 | flush_gro_hash(napi); |
d9f37d01 | 6764 | napi->gro_bitmask = 0; |
d565b0a1 | 6765 | } |
5198d545 | 6766 | EXPORT_SYMBOL(__netif_napi_del); |
d565b0a1 | 6767 | |
726ce70e HX |
6768 | static int napi_poll(struct napi_struct *n, struct list_head *repoll) |
6769 | { | |
6770 | void *have; | |
6771 | int work, weight; | |
6772 | ||
6773 | list_del_init(&n->poll_list); | |
6774 | ||
6775 | have = netpoll_poll_lock(n); | |
6776 | ||
6777 | weight = n->weight; | |
6778 | ||
6779 | /* This NAPI_STATE_SCHED test is for avoiding a race | |
6780 | * with netpoll's poll_napi(). Only the entity which | |
6781 | * obtains the lock and sees NAPI_STATE_SCHED set will | |
6782 | * actually make the ->poll() call. Therefore we avoid | |
6783 | * accidentally calling ->poll() when NAPI is not scheduled. | |
6784 | */ | |
6785 | work = 0; | |
6786 | if (test_bit(NAPI_STATE_SCHED, &n->state)) { | |
6787 | work = n->poll(n, weight); | |
1db19db7 | 6788 | trace_napi_poll(n, work, weight); |
726ce70e HX |
6789 | } |
6790 | ||
427d5838 ED |
6791 | if (unlikely(work > weight)) |
6792 | pr_err_once("NAPI poll function %pS returned %d, exceeding its budget of %d.\n", | |
6793 | n->poll, work, weight); | |
726ce70e HX |
6794 | |
6795 | if (likely(work < weight)) | |
6796 | goto out_unlock; | |
6797 | ||
6798 | /* Drivers must not modify the NAPI state if they | |
6799 | * consume the entire weight. In such cases this code | |
6800 | * still "owns" the NAPI instance and therefore can | |
6801 | * move the instance around on the list at-will. | |
6802 | */ | |
6803 | if (unlikely(napi_disable_pending(n))) { | |
6804 | napi_complete(n); | |
6805 | goto out_unlock; | |
6806 | } | |
6807 | ||
7fd3253a BT |
6808 | /* The NAPI context has more processing work, but busy-polling |
6809 | * is preferred. Exit early. | |
6810 | */ | |
6811 | if (napi_prefer_busy_poll(n)) { | |
6812 | if (napi_complete_done(n, work)) { | |
6813 | /* If timeout is not set, we need to make sure | |
6814 | * that the NAPI is re-scheduled. | |
6815 | */ | |
6816 | napi_schedule(n); | |
6817 | } | |
6818 | goto out_unlock; | |
6819 | } | |
6820 | ||
d9f37d01 | 6821 | if (n->gro_bitmask) { |
726ce70e HX |
6822 | /* flush too old packets |
6823 | * If HZ < 1000, flush all packets. | |
6824 | */ | |
6825 | napi_gro_flush(n, HZ >= 1000); | |
6826 | } | |
6827 | ||
c8079432 MM |
6828 | gro_normal_list(n); |
6829 | ||
001ce546 HX |
6830 | /* Some drivers may have called napi_schedule |
6831 | * prior to exhausting their budget. | |
6832 | */ | |
6833 | if (unlikely(!list_empty(&n->poll_list))) { | |
6834 | pr_warn_once("%s: Budget exhausted after napi rescheduled\n", | |
6835 | n->dev ? n->dev->name : "backlog"); | |
6836 | goto out_unlock; | |
6837 | } | |
6838 | ||
726ce70e HX |
6839 | list_add_tail(&n->poll_list, repoll); |
6840 | ||
6841 | out_unlock: | |
6842 | netpoll_poll_unlock(have); | |
6843 | ||
6844 | return work; | |
6845 | } | |
6846 | ||
0766f788 | 6847 | static __latent_entropy void net_rx_action(struct softirq_action *h) |
1da177e4 | 6848 | { |
903ceff7 | 6849 | struct softnet_data *sd = this_cpu_ptr(&softnet_data); |
7acf8a1e MW |
6850 | unsigned long time_limit = jiffies + |
6851 | usecs_to_jiffies(netdev_budget_usecs); | |
51b0bded | 6852 | int budget = netdev_budget; |
d75b1ade ED |
6853 | LIST_HEAD(list); |
6854 | LIST_HEAD(repoll); | |
53fb95d3 | 6855 | |
1da177e4 | 6856 | local_irq_disable(); |
d75b1ade ED |
6857 | list_splice_init(&sd->poll_list, &list); |
6858 | local_irq_enable(); | |
1da177e4 | 6859 | |
ceb8d5bf | 6860 | for (;;) { |
bea3348e | 6861 | struct napi_struct *n; |
1da177e4 | 6862 | |
ceb8d5bf HX |
6863 | if (list_empty(&list)) { |
6864 | if (!sd_has_rps_ipi_waiting(sd) && list_empty(&repoll)) | |
f52dffe0 | 6865 | goto out; |
ceb8d5bf HX |
6866 | break; |
6867 | } | |
6868 | ||
6bd373eb HX |
6869 | n = list_first_entry(&list, struct napi_struct, poll_list); |
6870 | budget -= napi_poll(n, &repoll); | |
6871 | ||
d75b1ade | 6872 | /* If softirq window is exhausted then punt. |
24f8b238 SH |
6873 | * Allow this to run for 2 jiffies since which will allow |
6874 | * an average latency of 1.5/HZ. | |
bea3348e | 6875 | */ |
ceb8d5bf HX |
6876 | if (unlikely(budget <= 0 || |
6877 | time_after_eq(jiffies, time_limit))) { | |
6878 | sd->time_squeeze++; | |
6879 | break; | |
6880 | } | |
1da177e4 | 6881 | } |
d75b1ade | 6882 | |
d75b1ade ED |
6883 | local_irq_disable(); |
6884 | ||
6885 | list_splice_tail_init(&sd->poll_list, &list); | |
6886 | list_splice_tail(&repoll, &list); | |
6887 | list_splice(&list, &sd->poll_list); | |
6888 | if (!list_empty(&sd->poll_list)) | |
6889 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); | |
6890 | ||
e326bed2 | 6891 | net_rps_action_and_irq_enable(sd); |
f52dffe0 ED |
6892 | out: |
6893 | __kfree_skb_flush(); | |
1da177e4 LT |
6894 | } |
6895 | ||
aa9d8560 | 6896 | struct netdev_adjacent { |
9ff162a8 | 6897 | struct net_device *dev; |
5d261913 VF |
6898 | |
6899 | /* upper master flag, there can only be one master device per list */ | |
9ff162a8 | 6900 | bool master; |
5d261913 | 6901 | |
32b6d34f TY |
6902 | /* lookup ignore flag */ |
6903 | bool ignore; | |
6904 | ||
5d261913 VF |
6905 | /* counter for the number of times this device was added to us */ |
6906 | u16 ref_nr; | |
6907 | ||
402dae96 VF |
6908 | /* private field for the users */ |
6909 | void *private; | |
6910 | ||
9ff162a8 JP |
6911 | struct list_head list; |
6912 | struct rcu_head rcu; | |
9ff162a8 JP |
6913 | }; |
6914 | ||
6ea29da1 | 6915 | static struct netdev_adjacent *__netdev_find_adj(struct net_device *adj_dev, |
2f268f12 | 6916 | struct list_head *adj_list) |
9ff162a8 | 6917 | { |
5d261913 | 6918 | struct netdev_adjacent *adj; |
5d261913 | 6919 | |
2f268f12 | 6920 | list_for_each_entry(adj, adj_list, list) { |
5d261913 VF |
6921 | if (adj->dev == adj_dev) |
6922 | return adj; | |
9ff162a8 JP |
6923 | } |
6924 | return NULL; | |
6925 | } | |
6926 | ||
eff74233 TY |
6927 | static int ____netdev_has_upper_dev(struct net_device *upper_dev, |
6928 | struct netdev_nested_priv *priv) | |
f1170fd4 | 6929 | { |
eff74233 | 6930 | struct net_device *dev = (struct net_device *)priv->data; |
f1170fd4 DA |
6931 | |
6932 | return upper_dev == dev; | |
6933 | } | |
6934 | ||
9ff162a8 JP |
6935 | /** |
6936 | * netdev_has_upper_dev - Check if device is linked to an upper device | |
6937 | * @dev: device | |
6938 | * @upper_dev: upper device to check | |
6939 | * | |
6940 | * Find out if a device is linked to specified upper device and return true | |
6941 | * in case it is. Note that this checks only immediate upper device, | |
6942 | * not through a complete stack of devices. The caller must hold the RTNL lock. | |
6943 | */ | |
6944 | bool netdev_has_upper_dev(struct net_device *dev, | |
6945 | struct net_device *upper_dev) | |
6946 | { | |
eff74233 TY |
6947 | struct netdev_nested_priv priv = { |
6948 | .data = (void *)upper_dev, | |
6949 | }; | |
6950 | ||
9ff162a8 JP |
6951 | ASSERT_RTNL(); |
6952 | ||
32b6d34f | 6953 | return netdev_walk_all_upper_dev_rcu(dev, ____netdev_has_upper_dev, |
eff74233 | 6954 | &priv); |
9ff162a8 JP |
6955 | } |
6956 | EXPORT_SYMBOL(netdev_has_upper_dev); | |
6957 | ||
1a3f060c | 6958 | /** |
c1639be9 | 6959 | * netdev_has_upper_dev_all_rcu - Check if device is linked to an upper device |
1a3f060c DA |
6960 | * @dev: device |
6961 | * @upper_dev: upper device to check | |
6962 | * | |
6963 | * Find out if a device is linked to specified upper device and return true | |
6964 | * in case it is. Note that this checks the entire upper device chain. | |
6965 | * The caller must hold rcu lock. | |
6966 | */ | |
6967 | ||
1a3f060c DA |
6968 | bool netdev_has_upper_dev_all_rcu(struct net_device *dev, |
6969 | struct net_device *upper_dev) | |
6970 | { | |
eff74233 TY |
6971 | struct netdev_nested_priv priv = { |
6972 | .data = (void *)upper_dev, | |
6973 | }; | |
6974 | ||
32b6d34f | 6975 | return !!netdev_walk_all_upper_dev_rcu(dev, ____netdev_has_upper_dev, |
eff74233 | 6976 | &priv); |
1a3f060c DA |
6977 | } |
6978 | EXPORT_SYMBOL(netdev_has_upper_dev_all_rcu); | |
6979 | ||
9ff162a8 JP |
6980 | /** |
6981 | * netdev_has_any_upper_dev - Check if device is linked to some device | |
6982 | * @dev: device | |
6983 | * | |
6984 | * Find out if a device is linked to an upper device and return true in case | |
6985 | * it is. The caller must hold the RTNL lock. | |
6986 | */ | |
25cc72a3 | 6987 | bool netdev_has_any_upper_dev(struct net_device *dev) |
9ff162a8 JP |
6988 | { |
6989 | ASSERT_RTNL(); | |
6990 | ||
f1170fd4 | 6991 | return !list_empty(&dev->adj_list.upper); |
9ff162a8 | 6992 | } |
25cc72a3 | 6993 | EXPORT_SYMBOL(netdev_has_any_upper_dev); |
9ff162a8 JP |
6994 | |
6995 | /** | |
6996 | * netdev_master_upper_dev_get - Get master upper device | |
6997 | * @dev: device | |
6998 | * | |
6999 | * Find a master upper device and return pointer to it or NULL in case | |
7000 | * it's not there. The caller must hold the RTNL lock. | |
7001 | */ | |
7002 | struct net_device *netdev_master_upper_dev_get(struct net_device *dev) | |
7003 | { | |
aa9d8560 | 7004 | struct netdev_adjacent *upper; |
9ff162a8 JP |
7005 | |
7006 | ASSERT_RTNL(); | |
7007 | ||
2f268f12 | 7008 | if (list_empty(&dev->adj_list.upper)) |
9ff162a8 JP |
7009 | return NULL; |
7010 | ||
2f268f12 | 7011 | upper = list_first_entry(&dev->adj_list.upper, |
aa9d8560 | 7012 | struct netdev_adjacent, list); |
9ff162a8 JP |
7013 | if (likely(upper->master)) |
7014 | return upper->dev; | |
7015 | return NULL; | |
7016 | } | |
7017 | EXPORT_SYMBOL(netdev_master_upper_dev_get); | |
7018 | ||
32b6d34f TY |
7019 | static struct net_device *__netdev_master_upper_dev_get(struct net_device *dev) |
7020 | { | |
7021 | struct netdev_adjacent *upper; | |
7022 | ||
7023 | ASSERT_RTNL(); | |
7024 | ||
7025 | if (list_empty(&dev->adj_list.upper)) | |
7026 | return NULL; | |
7027 | ||
7028 | upper = list_first_entry(&dev->adj_list.upper, | |
7029 | struct netdev_adjacent, list); | |
7030 | if (likely(upper->master) && !upper->ignore) | |
7031 | return upper->dev; | |
7032 | return NULL; | |
7033 | } | |
7034 | ||
0f524a80 DA |
7035 | /** |
7036 | * netdev_has_any_lower_dev - Check if device is linked to some device | |
7037 | * @dev: device | |
7038 | * | |
7039 | * Find out if a device is linked to a lower device and return true in case | |
7040 | * it is. The caller must hold the RTNL lock. | |
7041 | */ | |
7042 | static bool netdev_has_any_lower_dev(struct net_device *dev) | |
7043 | { | |
7044 | ASSERT_RTNL(); | |
7045 | ||
7046 | return !list_empty(&dev->adj_list.lower); | |
7047 | } | |
7048 | ||
b6ccba4c VF |
7049 | void *netdev_adjacent_get_private(struct list_head *adj_list) |
7050 | { | |
7051 | struct netdev_adjacent *adj; | |
7052 | ||
7053 | adj = list_entry(adj_list, struct netdev_adjacent, list); | |
7054 | ||
7055 | return adj->private; | |
7056 | } | |
7057 | EXPORT_SYMBOL(netdev_adjacent_get_private); | |
7058 | ||
44a40855 VY |
7059 | /** |
7060 | * netdev_upper_get_next_dev_rcu - Get the next dev from upper list | |
7061 | * @dev: device | |
7062 | * @iter: list_head ** of the current position | |
7063 | * | |
7064 | * Gets the next device from the dev's upper list, starting from iter | |
7065 | * position. The caller must hold RCU read lock. | |
7066 | */ | |
7067 | struct net_device *netdev_upper_get_next_dev_rcu(struct net_device *dev, | |
7068 | struct list_head **iter) | |
7069 | { | |
7070 | struct netdev_adjacent *upper; | |
7071 | ||
7072 | WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held()); | |
7073 | ||
7074 | upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); | |
7075 | ||
7076 | if (&upper->list == &dev->adj_list.upper) | |
7077 | return NULL; | |
7078 | ||
7079 | *iter = &upper->list; | |
7080 | ||
7081 | return upper->dev; | |
7082 | } | |
7083 | EXPORT_SYMBOL(netdev_upper_get_next_dev_rcu); | |
7084 | ||
32b6d34f TY |
7085 | static struct net_device *__netdev_next_upper_dev(struct net_device *dev, |
7086 | struct list_head **iter, | |
7087 | bool *ignore) | |
5343da4c TY |
7088 | { |
7089 | struct netdev_adjacent *upper; | |
7090 | ||
7091 | upper = list_entry((*iter)->next, struct netdev_adjacent, list); | |
7092 | ||
7093 | if (&upper->list == &dev->adj_list.upper) | |
7094 | return NULL; | |
7095 | ||
7096 | *iter = &upper->list; | |
32b6d34f | 7097 | *ignore = upper->ignore; |
5343da4c TY |
7098 | |
7099 | return upper->dev; | |
7100 | } | |
7101 | ||
1a3f060c DA |
7102 | static struct net_device *netdev_next_upper_dev_rcu(struct net_device *dev, |
7103 | struct list_head **iter) | |
7104 | { | |
7105 | struct netdev_adjacent *upper; | |
7106 | ||
7107 | WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held()); | |
7108 | ||
7109 | upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); | |
7110 | ||
7111 | if (&upper->list == &dev->adj_list.upper) | |
7112 | return NULL; | |
7113 | ||
7114 | *iter = &upper->list; | |
7115 | ||
7116 | return upper->dev; | |
7117 | } | |
7118 | ||
32b6d34f TY |
7119 | static int __netdev_walk_all_upper_dev(struct net_device *dev, |
7120 | int (*fn)(struct net_device *dev, | |
eff74233 TY |
7121 | struct netdev_nested_priv *priv), |
7122 | struct netdev_nested_priv *priv) | |
5343da4c TY |
7123 | { |
7124 | struct net_device *udev, *next, *now, *dev_stack[MAX_NEST_DEV + 1]; | |
7125 | struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1]; | |
7126 | int ret, cur = 0; | |
32b6d34f | 7127 | bool ignore; |
5343da4c TY |
7128 | |
7129 | now = dev; | |
7130 | iter = &dev->adj_list.upper; | |
7131 | ||
7132 | while (1) { | |
7133 | if (now != dev) { | |
eff74233 | 7134 | ret = fn(now, priv); |
5343da4c TY |
7135 | if (ret) |
7136 | return ret; | |
7137 | } | |
7138 | ||
7139 | next = NULL; | |
7140 | while (1) { | |
32b6d34f | 7141 | udev = __netdev_next_upper_dev(now, &iter, &ignore); |
5343da4c TY |
7142 | if (!udev) |
7143 | break; | |
32b6d34f TY |
7144 | if (ignore) |
7145 | continue; | |
5343da4c TY |
7146 | |
7147 | next = udev; | |
7148 | niter = &udev->adj_list.upper; | |
7149 | dev_stack[cur] = now; | |
7150 | iter_stack[cur++] = iter; | |
7151 | break; | |
7152 | } | |
7153 | ||
7154 | if (!next) { | |
7155 | if (!cur) | |
7156 | return 0; | |
7157 | next = dev_stack[--cur]; | |
7158 | niter = iter_stack[cur]; | |
7159 | } | |
7160 | ||
7161 | now = next; | |
7162 | iter = niter; | |
7163 | } | |
7164 | ||
7165 | return 0; | |
7166 | } | |
7167 | ||
1a3f060c DA |
7168 | int netdev_walk_all_upper_dev_rcu(struct net_device *dev, |
7169 | int (*fn)(struct net_device *dev, | |
eff74233 TY |
7170 | struct netdev_nested_priv *priv), |
7171 | struct netdev_nested_priv *priv) | |
1a3f060c | 7172 | { |
5343da4c TY |
7173 | struct net_device *udev, *next, *now, *dev_stack[MAX_NEST_DEV + 1]; |
7174 | struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1]; | |
7175 | int ret, cur = 0; | |
1a3f060c | 7176 | |
5343da4c TY |
7177 | now = dev; |
7178 | iter = &dev->adj_list.upper; | |
1a3f060c | 7179 | |
5343da4c TY |
7180 | while (1) { |
7181 | if (now != dev) { | |
eff74233 | 7182 | ret = fn(now, priv); |
5343da4c TY |
7183 | if (ret) |
7184 | return ret; | |
7185 | } | |
7186 | ||
7187 | next = NULL; | |
7188 | while (1) { | |
7189 | udev = netdev_next_upper_dev_rcu(now, &iter); | |
7190 | if (!udev) | |
7191 | break; | |
7192 | ||
7193 | next = udev; | |
7194 | niter = &udev->adj_list.upper; | |
7195 | dev_stack[cur] = now; | |
7196 | iter_stack[cur++] = iter; | |
7197 | break; | |
7198 | } | |
7199 | ||
7200 | if (!next) { | |
7201 | if (!cur) | |
7202 | return 0; | |
7203 | next = dev_stack[--cur]; | |
7204 | niter = iter_stack[cur]; | |
7205 | } | |
7206 | ||
7207 | now = next; | |
7208 | iter = niter; | |
1a3f060c DA |
7209 | } |
7210 | ||
7211 | return 0; | |
7212 | } | |
7213 | EXPORT_SYMBOL_GPL(netdev_walk_all_upper_dev_rcu); | |
7214 | ||
32b6d34f TY |
7215 | static bool __netdev_has_upper_dev(struct net_device *dev, |
7216 | struct net_device *upper_dev) | |
7217 | { | |
eff74233 | 7218 | struct netdev_nested_priv priv = { |
1fc70edb | 7219 | .flags = 0, |
eff74233 TY |
7220 | .data = (void *)upper_dev, |
7221 | }; | |
7222 | ||
32b6d34f TY |
7223 | ASSERT_RTNL(); |
7224 | ||
7225 | return __netdev_walk_all_upper_dev(dev, ____netdev_has_upper_dev, | |
eff74233 | 7226 | &priv); |
32b6d34f TY |
7227 | } |
7228 | ||
31088a11 VF |
7229 | /** |
7230 | * netdev_lower_get_next_private - Get the next ->private from the | |
7231 | * lower neighbour list | |
7232 | * @dev: device | |
7233 | * @iter: list_head ** of the current position | |
7234 | * | |
7235 | * Gets the next netdev_adjacent->private from the dev's lower neighbour | |
7236 | * list, starting from iter position. The caller must hold either hold the | |
7237 | * RTNL lock or its own locking that guarantees that the neighbour lower | |
b469139e | 7238 | * list will remain unchanged. |
31088a11 VF |
7239 | */ |
7240 | void *netdev_lower_get_next_private(struct net_device *dev, | |
7241 | struct list_head **iter) | |
7242 | { | |
7243 | struct netdev_adjacent *lower; | |
7244 | ||
7245 | lower = list_entry(*iter, struct netdev_adjacent, list); | |
7246 | ||
7247 | if (&lower->list == &dev->adj_list.lower) | |
7248 | return NULL; | |
7249 | ||
6859e7df | 7250 | *iter = lower->list.next; |
31088a11 VF |
7251 | |
7252 | return lower->private; | |
7253 | } | |
7254 | EXPORT_SYMBOL(netdev_lower_get_next_private); | |
7255 | ||
7256 | /** | |
7257 | * netdev_lower_get_next_private_rcu - Get the next ->private from the | |
7258 | * lower neighbour list, RCU | |
7259 | * variant | |
7260 | * @dev: device | |
7261 | * @iter: list_head ** of the current position | |
7262 | * | |
7263 | * Gets the next netdev_adjacent->private from the dev's lower neighbour | |
7264 | * list, starting from iter position. The caller must hold RCU read lock. | |
7265 | */ | |
7266 | void *netdev_lower_get_next_private_rcu(struct net_device *dev, | |
7267 | struct list_head **iter) | |
7268 | { | |
7269 | struct netdev_adjacent *lower; | |
7270 | ||
7271 | WARN_ON_ONCE(!rcu_read_lock_held()); | |
7272 | ||
7273 | lower = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); | |
7274 | ||
7275 | if (&lower->list == &dev->adj_list.lower) | |
7276 | return NULL; | |
7277 | ||
6859e7df | 7278 | *iter = &lower->list; |
31088a11 VF |
7279 | |
7280 | return lower->private; | |
7281 | } | |
7282 | EXPORT_SYMBOL(netdev_lower_get_next_private_rcu); | |
7283 | ||
4085ebe8 VY |
7284 | /** |
7285 | * netdev_lower_get_next - Get the next device from the lower neighbour | |
7286 | * list | |
7287 | * @dev: device | |
7288 | * @iter: list_head ** of the current position | |
7289 | * | |
7290 | * Gets the next netdev_adjacent from the dev's lower neighbour | |
7291 | * list, starting from iter position. The caller must hold RTNL lock or | |
7292 | * its own locking that guarantees that the neighbour lower | |
b469139e | 7293 | * list will remain unchanged. |
4085ebe8 VY |
7294 | */ |
7295 | void *netdev_lower_get_next(struct net_device *dev, struct list_head **iter) | |
7296 | { | |
7297 | struct netdev_adjacent *lower; | |
7298 | ||
cfdd28be | 7299 | lower = list_entry(*iter, struct netdev_adjacent, list); |
4085ebe8 VY |
7300 | |
7301 | if (&lower->list == &dev->adj_list.lower) | |
7302 | return NULL; | |
7303 | ||
cfdd28be | 7304 | *iter = lower->list.next; |
4085ebe8 VY |
7305 | |
7306 | return lower->dev; | |
7307 | } | |
7308 | EXPORT_SYMBOL(netdev_lower_get_next); | |
7309 | ||
1a3f060c DA |
7310 | static struct net_device *netdev_next_lower_dev(struct net_device *dev, |
7311 | struct list_head **iter) | |
7312 | { | |
7313 | struct netdev_adjacent *lower; | |
7314 | ||
46b5ab1a | 7315 | lower = list_entry((*iter)->next, struct netdev_adjacent, list); |
1a3f060c DA |
7316 | |
7317 | if (&lower->list == &dev->adj_list.lower) | |
7318 | return NULL; | |
7319 | ||
46b5ab1a | 7320 | *iter = &lower->list; |
1a3f060c DA |
7321 | |
7322 | return lower->dev; | |
7323 | } | |
7324 | ||
32b6d34f TY |
7325 | static struct net_device *__netdev_next_lower_dev(struct net_device *dev, |
7326 | struct list_head **iter, | |
7327 | bool *ignore) | |
7328 | { | |
7329 | struct netdev_adjacent *lower; | |
7330 | ||
7331 | lower = list_entry((*iter)->next, struct netdev_adjacent, list); | |
7332 | ||
7333 | if (&lower->list == &dev->adj_list.lower) | |
7334 | return NULL; | |
7335 | ||
7336 | *iter = &lower->list; | |
7337 | *ignore = lower->ignore; | |
7338 | ||
7339 | return lower->dev; | |
7340 | } | |
7341 | ||
1a3f060c DA |
7342 | int netdev_walk_all_lower_dev(struct net_device *dev, |
7343 | int (*fn)(struct net_device *dev, | |
eff74233 TY |
7344 | struct netdev_nested_priv *priv), |
7345 | struct netdev_nested_priv *priv) | |
1a3f060c | 7346 | { |
5343da4c TY |
7347 | struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1]; |
7348 | struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1]; | |
7349 | int ret, cur = 0; | |
1a3f060c | 7350 | |
5343da4c TY |
7351 | now = dev; |
7352 | iter = &dev->adj_list.lower; | |
1a3f060c | 7353 | |
5343da4c TY |
7354 | while (1) { |
7355 | if (now != dev) { | |
eff74233 | 7356 | ret = fn(now, priv); |
5343da4c TY |
7357 | if (ret) |
7358 | return ret; | |
7359 | } | |
7360 | ||
7361 | next = NULL; | |
7362 | while (1) { | |
7363 | ldev = netdev_next_lower_dev(now, &iter); | |
7364 | if (!ldev) | |
7365 | break; | |
7366 | ||
7367 | next = ldev; | |
7368 | niter = &ldev->adj_list.lower; | |
7369 | dev_stack[cur] = now; | |
7370 | iter_stack[cur++] = iter; | |
7371 | break; | |
7372 | } | |
7373 | ||
7374 | if (!next) { | |
7375 | if (!cur) | |
7376 | return 0; | |
7377 | next = dev_stack[--cur]; | |
7378 | niter = iter_stack[cur]; | |
7379 | } | |
7380 | ||
7381 | now = next; | |
7382 | iter = niter; | |
1a3f060c DA |
7383 | } |
7384 | ||
7385 | return 0; | |
7386 | } | |
7387 | EXPORT_SYMBOL_GPL(netdev_walk_all_lower_dev); | |
7388 | ||
32b6d34f TY |
7389 | static int __netdev_walk_all_lower_dev(struct net_device *dev, |
7390 | int (*fn)(struct net_device *dev, | |
eff74233 TY |
7391 | struct netdev_nested_priv *priv), |
7392 | struct netdev_nested_priv *priv) | |
32b6d34f TY |
7393 | { |
7394 | struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1]; | |
7395 | struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1]; | |
7396 | int ret, cur = 0; | |
7397 | bool ignore; | |
7398 | ||
7399 | now = dev; | |
7400 | iter = &dev->adj_list.lower; | |
7401 | ||
7402 | while (1) { | |
7403 | if (now != dev) { | |
eff74233 | 7404 | ret = fn(now, priv); |
32b6d34f TY |
7405 | if (ret) |
7406 | return ret; | |
7407 | } | |
7408 | ||
7409 | next = NULL; | |
7410 | while (1) { | |
7411 | ldev = __netdev_next_lower_dev(now, &iter, &ignore); | |
7412 | if (!ldev) | |
7413 | break; | |
7414 | if (ignore) | |
7415 | continue; | |
7416 | ||
7417 | next = ldev; | |
7418 | niter = &ldev->adj_list.lower; | |
7419 | dev_stack[cur] = now; | |
7420 | iter_stack[cur++] = iter; | |
7421 | break; | |
7422 | } | |
7423 | ||
7424 | if (!next) { | |
7425 | if (!cur) | |
7426 | return 0; | |
7427 | next = dev_stack[--cur]; | |
7428 | niter = iter_stack[cur]; | |
7429 | } | |
7430 | ||
7431 | now = next; | |
7432 | iter = niter; | |
7433 | } | |
7434 | ||
7435 | return 0; | |
7436 | } | |
7437 | ||
7151affe TY |
7438 | struct net_device *netdev_next_lower_dev_rcu(struct net_device *dev, |
7439 | struct list_head **iter) | |
1a3f060c DA |
7440 | { |
7441 | struct netdev_adjacent *lower; | |
7442 | ||
7443 | lower = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); | |
7444 | if (&lower->list == &dev->adj_list.lower) | |
7445 | return NULL; | |
7446 | ||
7447 | *iter = &lower->list; | |
7448 | ||
7449 | return lower->dev; | |
7450 | } | |
7151affe | 7451 | EXPORT_SYMBOL(netdev_next_lower_dev_rcu); |
1a3f060c | 7452 | |
5343da4c TY |
7453 | static u8 __netdev_upper_depth(struct net_device *dev) |
7454 | { | |
7455 | struct net_device *udev; | |
7456 | struct list_head *iter; | |
7457 | u8 max_depth = 0; | |
32b6d34f | 7458 | bool ignore; |
5343da4c TY |
7459 | |
7460 | for (iter = &dev->adj_list.upper, | |
32b6d34f | 7461 | udev = __netdev_next_upper_dev(dev, &iter, &ignore); |
5343da4c | 7462 | udev; |
32b6d34f TY |
7463 | udev = __netdev_next_upper_dev(dev, &iter, &ignore)) { |
7464 | if (ignore) | |
7465 | continue; | |
5343da4c TY |
7466 | if (max_depth < udev->upper_level) |
7467 | max_depth = udev->upper_level; | |
7468 | } | |
7469 | ||
7470 | return max_depth; | |
7471 | } | |
7472 | ||
7473 | static u8 __netdev_lower_depth(struct net_device *dev) | |
1a3f060c DA |
7474 | { |
7475 | struct net_device *ldev; | |
7476 | struct list_head *iter; | |
5343da4c | 7477 | u8 max_depth = 0; |
32b6d34f | 7478 | bool ignore; |
1a3f060c DA |
7479 | |
7480 | for (iter = &dev->adj_list.lower, | |
32b6d34f | 7481 | ldev = __netdev_next_lower_dev(dev, &iter, &ignore); |
1a3f060c | 7482 | ldev; |
32b6d34f TY |
7483 | ldev = __netdev_next_lower_dev(dev, &iter, &ignore)) { |
7484 | if (ignore) | |
7485 | continue; | |
5343da4c TY |
7486 | if (max_depth < ldev->lower_level) |
7487 | max_depth = ldev->lower_level; | |
7488 | } | |
1a3f060c | 7489 | |
5343da4c TY |
7490 | return max_depth; |
7491 | } | |
7492 | ||
eff74233 TY |
7493 | static int __netdev_update_upper_level(struct net_device *dev, |
7494 | struct netdev_nested_priv *__unused) | |
5343da4c TY |
7495 | { |
7496 | dev->upper_level = __netdev_upper_depth(dev) + 1; | |
7497 | return 0; | |
7498 | } | |
7499 | ||
eff74233 | 7500 | static int __netdev_update_lower_level(struct net_device *dev, |
1fc70edb | 7501 | struct netdev_nested_priv *priv) |
5343da4c TY |
7502 | { |
7503 | dev->lower_level = __netdev_lower_depth(dev) + 1; | |
1fc70edb TY |
7504 | |
7505 | #ifdef CONFIG_LOCKDEP | |
7506 | if (!priv) | |
7507 | return 0; | |
7508 | ||
7509 | if (priv->flags & NESTED_SYNC_IMM) | |
7510 | dev->nested_level = dev->lower_level - 1; | |
7511 | if (priv->flags & NESTED_SYNC_TODO) | |
7512 | net_unlink_todo(dev); | |
7513 | #endif | |
5343da4c TY |
7514 | return 0; |
7515 | } | |
7516 | ||
7517 | int netdev_walk_all_lower_dev_rcu(struct net_device *dev, | |
7518 | int (*fn)(struct net_device *dev, | |
eff74233 TY |
7519 | struct netdev_nested_priv *priv), |
7520 | struct netdev_nested_priv *priv) | |
5343da4c TY |
7521 | { |
7522 | struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1]; | |
7523 | struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1]; | |
7524 | int ret, cur = 0; | |
7525 | ||
7526 | now = dev; | |
7527 | iter = &dev->adj_list.lower; | |
7528 | ||
7529 | while (1) { | |
7530 | if (now != dev) { | |
eff74233 | 7531 | ret = fn(now, priv); |
5343da4c TY |
7532 | if (ret) |
7533 | return ret; | |
7534 | } | |
7535 | ||
7536 | next = NULL; | |
7537 | while (1) { | |
7538 | ldev = netdev_next_lower_dev_rcu(now, &iter); | |
7539 | if (!ldev) | |
7540 | break; | |
7541 | ||
7542 | next = ldev; | |
7543 | niter = &ldev->adj_list.lower; | |
7544 | dev_stack[cur] = now; | |
7545 | iter_stack[cur++] = iter; | |
7546 | break; | |
7547 | } | |
7548 | ||
7549 | if (!next) { | |
7550 | if (!cur) | |
7551 | return 0; | |
7552 | next = dev_stack[--cur]; | |
7553 | niter = iter_stack[cur]; | |
7554 | } | |
7555 | ||
7556 | now = next; | |
7557 | iter = niter; | |
1a3f060c DA |
7558 | } |
7559 | ||
7560 | return 0; | |
7561 | } | |
7562 | EXPORT_SYMBOL_GPL(netdev_walk_all_lower_dev_rcu); | |
7563 | ||
e001bfad | 7564 | /** |
7565 | * netdev_lower_get_first_private_rcu - Get the first ->private from the | |
7566 | * lower neighbour list, RCU | |
7567 | * variant | |
7568 | * @dev: device | |
7569 | * | |
7570 | * Gets the first netdev_adjacent->private from the dev's lower neighbour | |
7571 | * list. The caller must hold RCU read lock. | |
7572 | */ | |
7573 | void *netdev_lower_get_first_private_rcu(struct net_device *dev) | |
7574 | { | |
7575 | struct netdev_adjacent *lower; | |
7576 | ||
7577 | lower = list_first_or_null_rcu(&dev->adj_list.lower, | |
7578 | struct netdev_adjacent, list); | |
7579 | if (lower) | |
7580 | return lower->private; | |
7581 | return NULL; | |
7582 | } | |
7583 | EXPORT_SYMBOL(netdev_lower_get_first_private_rcu); | |
7584 | ||
9ff162a8 JP |
7585 | /** |
7586 | * netdev_master_upper_dev_get_rcu - Get master upper device | |
7587 | * @dev: device | |
7588 | * | |
7589 | * Find a master upper device and return pointer to it or NULL in case | |
7590 | * it's not there. The caller must hold the RCU read lock. | |
7591 | */ | |
7592 | struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev) | |
7593 | { | |
aa9d8560 | 7594 | struct netdev_adjacent *upper; |
9ff162a8 | 7595 | |
2f268f12 | 7596 | upper = list_first_or_null_rcu(&dev->adj_list.upper, |
aa9d8560 | 7597 | struct netdev_adjacent, list); |
9ff162a8 JP |
7598 | if (upper && likely(upper->master)) |
7599 | return upper->dev; | |
7600 | return NULL; | |
7601 | } | |
7602 | EXPORT_SYMBOL(netdev_master_upper_dev_get_rcu); | |
7603 | ||
0a59f3a9 | 7604 | static int netdev_adjacent_sysfs_add(struct net_device *dev, |
3ee32707 VF |
7605 | struct net_device *adj_dev, |
7606 | struct list_head *dev_list) | |
7607 | { | |
7608 | char linkname[IFNAMSIZ+7]; | |
f4563a75 | 7609 | |
3ee32707 VF |
7610 | sprintf(linkname, dev_list == &dev->adj_list.upper ? |
7611 | "upper_%s" : "lower_%s", adj_dev->name); | |
7612 | return sysfs_create_link(&(dev->dev.kobj), &(adj_dev->dev.kobj), | |
7613 | linkname); | |
7614 | } | |
0a59f3a9 | 7615 | static void netdev_adjacent_sysfs_del(struct net_device *dev, |
3ee32707 VF |
7616 | char *name, |
7617 | struct list_head *dev_list) | |
7618 | { | |
7619 | char linkname[IFNAMSIZ+7]; | |
f4563a75 | 7620 | |
3ee32707 VF |
7621 | sprintf(linkname, dev_list == &dev->adj_list.upper ? |
7622 | "upper_%s" : "lower_%s", name); | |
7623 | sysfs_remove_link(&(dev->dev.kobj), linkname); | |
7624 | } | |
7625 | ||
7ce64c79 AF |
7626 | static inline bool netdev_adjacent_is_neigh_list(struct net_device *dev, |
7627 | struct net_device *adj_dev, | |
7628 | struct list_head *dev_list) | |
7629 | { | |
7630 | return (dev_list == &dev->adj_list.upper || | |
7631 | dev_list == &dev->adj_list.lower) && | |
7632 | net_eq(dev_net(dev), dev_net(adj_dev)); | |
7633 | } | |
3ee32707 | 7634 | |
5d261913 VF |
7635 | static int __netdev_adjacent_dev_insert(struct net_device *dev, |
7636 | struct net_device *adj_dev, | |
7863c054 | 7637 | struct list_head *dev_list, |
402dae96 | 7638 | void *private, bool master) |
5d261913 VF |
7639 | { |
7640 | struct netdev_adjacent *adj; | |
842d67a7 | 7641 | int ret; |
5d261913 | 7642 | |
6ea29da1 | 7643 | adj = __netdev_find_adj(adj_dev, dev_list); |
5d261913 VF |
7644 | |
7645 | if (adj) { | |
790510d9 | 7646 | adj->ref_nr += 1; |
67b62f98 DA |
7647 | pr_debug("Insert adjacency: dev %s adj_dev %s adj->ref_nr %d\n", |
7648 | dev->name, adj_dev->name, adj->ref_nr); | |
7649 | ||
5d261913 VF |
7650 | return 0; |
7651 | } | |
7652 | ||
7653 | adj = kmalloc(sizeof(*adj), GFP_KERNEL); | |
7654 | if (!adj) | |
7655 | return -ENOMEM; | |
7656 | ||
7657 | adj->dev = adj_dev; | |
7658 | adj->master = master; | |
790510d9 | 7659 | adj->ref_nr = 1; |
402dae96 | 7660 | adj->private = private; |
32b6d34f | 7661 | adj->ignore = false; |
5d261913 | 7662 | dev_hold(adj_dev); |
2f268f12 | 7663 | |
67b62f98 DA |
7664 | pr_debug("Insert adjacency: dev %s adj_dev %s adj->ref_nr %d; dev_hold on %s\n", |
7665 | dev->name, adj_dev->name, adj->ref_nr, adj_dev->name); | |
5d261913 | 7666 | |
7ce64c79 | 7667 | if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list)) { |
3ee32707 | 7668 | ret = netdev_adjacent_sysfs_add(dev, adj_dev, dev_list); |
5831d66e VF |
7669 | if (ret) |
7670 | goto free_adj; | |
7671 | } | |
7672 | ||
7863c054 | 7673 | /* Ensure that master link is always the first item in list. */ |
842d67a7 VF |
7674 | if (master) { |
7675 | ret = sysfs_create_link(&(dev->dev.kobj), | |
7676 | &(adj_dev->dev.kobj), "master"); | |
7677 | if (ret) | |
5831d66e | 7678 | goto remove_symlinks; |
842d67a7 | 7679 | |
7863c054 | 7680 | list_add_rcu(&adj->list, dev_list); |
842d67a7 | 7681 | } else { |
7863c054 | 7682 | list_add_tail_rcu(&adj->list, dev_list); |
842d67a7 | 7683 | } |
5d261913 VF |
7684 | |
7685 | return 0; | |
842d67a7 | 7686 | |
5831d66e | 7687 | remove_symlinks: |
7ce64c79 | 7688 | if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list)) |
3ee32707 | 7689 | netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list); |
842d67a7 VF |
7690 | free_adj: |
7691 | kfree(adj); | |
974daef7 | 7692 | dev_put(adj_dev); |
842d67a7 VF |
7693 | |
7694 | return ret; | |
5d261913 VF |
7695 | } |
7696 | ||
1d143d9f | 7697 | static void __netdev_adjacent_dev_remove(struct net_device *dev, |
7698 | struct net_device *adj_dev, | |
93409033 | 7699 | u16 ref_nr, |
1d143d9f | 7700 | struct list_head *dev_list) |
5d261913 VF |
7701 | { |
7702 | struct netdev_adjacent *adj; | |
7703 | ||
67b62f98 DA |
7704 | pr_debug("Remove adjacency: dev %s adj_dev %s ref_nr %d\n", |
7705 | dev->name, adj_dev->name, ref_nr); | |
7706 | ||
6ea29da1 | 7707 | adj = __netdev_find_adj(adj_dev, dev_list); |
5d261913 | 7708 | |
2f268f12 | 7709 | if (!adj) { |
67b62f98 | 7710 | pr_err("Adjacency does not exist for device %s from %s\n", |
2f268f12 | 7711 | dev->name, adj_dev->name); |
67b62f98 DA |
7712 | WARN_ON(1); |
7713 | return; | |
2f268f12 | 7714 | } |
5d261913 | 7715 | |
93409033 | 7716 | if (adj->ref_nr > ref_nr) { |
67b62f98 DA |
7717 | pr_debug("adjacency: %s to %s ref_nr - %d = %d\n", |
7718 | dev->name, adj_dev->name, ref_nr, | |
7719 | adj->ref_nr - ref_nr); | |
93409033 | 7720 | adj->ref_nr -= ref_nr; |
5d261913 VF |
7721 | return; |
7722 | } | |
7723 | ||
842d67a7 VF |
7724 | if (adj->master) |
7725 | sysfs_remove_link(&(dev->dev.kobj), "master"); | |
7726 | ||
7ce64c79 | 7727 | if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list)) |
3ee32707 | 7728 | netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list); |
5831d66e | 7729 | |
5d261913 | 7730 | list_del_rcu(&adj->list); |
67b62f98 | 7731 | pr_debug("adjacency: dev_put for %s, because link removed from %s to %s\n", |
2f268f12 | 7732 | adj_dev->name, dev->name, adj_dev->name); |
5d261913 VF |
7733 | dev_put(adj_dev); |
7734 | kfree_rcu(adj, rcu); | |
7735 | } | |
7736 | ||
1d143d9f | 7737 | static int __netdev_adjacent_dev_link_lists(struct net_device *dev, |
7738 | struct net_device *upper_dev, | |
7739 | struct list_head *up_list, | |
7740 | struct list_head *down_list, | |
7741 | void *private, bool master) | |
5d261913 VF |
7742 | { |
7743 | int ret; | |
7744 | ||
790510d9 | 7745 | ret = __netdev_adjacent_dev_insert(dev, upper_dev, up_list, |
93409033 | 7746 | private, master); |
5d261913 VF |
7747 | if (ret) |
7748 | return ret; | |
7749 | ||
790510d9 | 7750 | ret = __netdev_adjacent_dev_insert(upper_dev, dev, down_list, |
93409033 | 7751 | private, false); |
5d261913 | 7752 | if (ret) { |
790510d9 | 7753 | __netdev_adjacent_dev_remove(dev, upper_dev, 1, up_list); |
5d261913 VF |
7754 | return ret; |
7755 | } | |
7756 | ||
7757 | return 0; | |
7758 | } | |
7759 | ||
1d143d9f | 7760 | static void __netdev_adjacent_dev_unlink_lists(struct net_device *dev, |
7761 | struct net_device *upper_dev, | |
93409033 | 7762 | u16 ref_nr, |
1d143d9f | 7763 | struct list_head *up_list, |
7764 | struct list_head *down_list) | |
5d261913 | 7765 | { |
93409033 AC |
7766 | __netdev_adjacent_dev_remove(dev, upper_dev, ref_nr, up_list); |
7767 | __netdev_adjacent_dev_remove(upper_dev, dev, ref_nr, down_list); | |
5d261913 VF |
7768 | } |
7769 | ||
1d143d9f | 7770 | static int __netdev_adjacent_dev_link_neighbour(struct net_device *dev, |
7771 | struct net_device *upper_dev, | |
7772 | void *private, bool master) | |
2f268f12 | 7773 | { |
f1170fd4 DA |
7774 | return __netdev_adjacent_dev_link_lists(dev, upper_dev, |
7775 | &dev->adj_list.upper, | |
7776 | &upper_dev->adj_list.lower, | |
7777 | private, master); | |
5d261913 VF |
7778 | } |
7779 | ||
1d143d9f | 7780 | static void __netdev_adjacent_dev_unlink_neighbour(struct net_device *dev, |
7781 | struct net_device *upper_dev) | |
2f268f12 | 7782 | { |
93409033 | 7783 | __netdev_adjacent_dev_unlink_lists(dev, upper_dev, 1, |
2f268f12 VF |
7784 | &dev->adj_list.upper, |
7785 | &upper_dev->adj_list.lower); | |
7786 | } | |
5d261913 | 7787 | |
9ff162a8 | 7788 | static int __netdev_upper_dev_link(struct net_device *dev, |
402dae96 | 7789 | struct net_device *upper_dev, bool master, |
42ab19ee | 7790 | void *upper_priv, void *upper_info, |
1fc70edb | 7791 | struct netdev_nested_priv *priv, |
42ab19ee | 7792 | struct netlink_ext_ack *extack) |
9ff162a8 | 7793 | { |
51d0c047 DA |
7794 | struct netdev_notifier_changeupper_info changeupper_info = { |
7795 | .info = { | |
7796 | .dev = dev, | |
42ab19ee | 7797 | .extack = extack, |
51d0c047 DA |
7798 | }, |
7799 | .upper_dev = upper_dev, | |
7800 | .master = master, | |
7801 | .linking = true, | |
7802 | .upper_info = upper_info, | |
7803 | }; | |
50d629e7 | 7804 | struct net_device *master_dev; |
5d261913 | 7805 | int ret = 0; |
9ff162a8 JP |
7806 | |
7807 | ASSERT_RTNL(); | |
7808 | ||
7809 | if (dev == upper_dev) | |
7810 | return -EBUSY; | |
7811 | ||
7812 | /* To prevent loops, check if dev is not upper device to upper_dev. */ | |
32b6d34f | 7813 | if (__netdev_has_upper_dev(upper_dev, dev)) |
9ff162a8 JP |
7814 | return -EBUSY; |
7815 | ||
5343da4c TY |
7816 | if ((dev->lower_level + upper_dev->upper_level) > MAX_NEST_DEV) |
7817 | return -EMLINK; | |
7818 | ||
50d629e7 | 7819 | if (!master) { |
32b6d34f | 7820 | if (__netdev_has_upper_dev(dev, upper_dev)) |
50d629e7 MM |
7821 | return -EEXIST; |
7822 | } else { | |
32b6d34f | 7823 | master_dev = __netdev_master_upper_dev_get(dev); |
50d629e7 MM |
7824 | if (master_dev) |
7825 | return master_dev == upper_dev ? -EEXIST : -EBUSY; | |
7826 | } | |
9ff162a8 | 7827 | |
51d0c047 | 7828 | ret = call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER, |
573c7ba0 JP |
7829 | &changeupper_info.info); |
7830 | ret = notifier_to_errno(ret); | |
7831 | if (ret) | |
7832 | return ret; | |
7833 | ||
6dffb044 | 7834 | ret = __netdev_adjacent_dev_link_neighbour(dev, upper_dev, upper_priv, |
402dae96 | 7835 | master); |
5d261913 VF |
7836 | if (ret) |
7837 | return ret; | |
9ff162a8 | 7838 | |
51d0c047 | 7839 | ret = call_netdevice_notifiers_info(NETDEV_CHANGEUPPER, |
b03804e7 IS |
7840 | &changeupper_info.info); |
7841 | ret = notifier_to_errno(ret); | |
7842 | if (ret) | |
f1170fd4 | 7843 | goto rollback; |
b03804e7 | 7844 | |
5343da4c | 7845 | __netdev_update_upper_level(dev, NULL); |
32b6d34f | 7846 | __netdev_walk_all_lower_dev(dev, __netdev_update_upper_level, NULL); |
5343da4c | 7847 | |
1fc70edb | 7848 | __netdev_update_lower_level(upper_dev, priv); |
32b6d34f | 7849 | __netdev_walk_all_upper_dev(upper_dev, __netdev_update_lower_level, |
1fc70edb | 7850 | priv); |
5343da4c | 7851 | |
9ff162a8 | 7852 | return 0; |
5d261913 | 7853 | |
f1170fd4 | 7854 | rollback: |
2f268f12 | 7855 | __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev); |
5d261913 VF |
7856 | |
7857 | return ret; | |
9ff162a8 JP |
7858 | } |
7859 | ||
7860 | /** | |
7861 | * netdev_upper_dev_link - Add a link to the upper device | |
7862 | * @dev: device | |
7863 | * @upper_dev: new upper device | |
7a006d59 | 7864 | * @extack: netlink extended ack |
9ff162a8 JP |
7865 | * |
7866 | * Adds a link to device which is upper to this one. The caller must hold | |
7867 | * the RTNL lock. On a failure a negative errno code is returned. | |
7868 | * On success the reference counts are adjusted and the function | |
7869 | * returns zero. | |
7870 | */ | |
7871 | int netdev_upper_dev_link(struct net_device *dev, | |
42ab19ee DA |
7872 | struct net_device *upper_dev, |
7873 | struct netlink_ext_ack *extack) | |
9ff162a8 | 7874 | { |
1fc70edb TY |
7875 | struct netdev_nested_priv priv = { |
7876 | .flags = NESTED_SYNC_IMM | NESTED_SYNC_TODO, | |
7877 | .data = NULL, | |
7878 | }; | |
7879 | ||
42ab19ee | 7880 | return __netdev_upper_dev_link(dev, upper_dev, false, |
1fc70edb | 7881 | NULL, NULL, &priv, extack); |
9ff162a8 JP |
7882 | } |
7883 | EXPORT_SYMBOL(netdev_upper_dev_link); | |
7884 | ||
7885 | /** | |
7886 | * netdev_master_upper_dev_link - Add a master link to the upper device | |
7887 | * @dev: device | |
7888 | * @upper_dev: new upper device | |
6dffb044 | 7889 | * @upper_priv: upper device private |
29bf24af | 7890 | * @upper_info: upper info to be passed down via notifier |
7a006d59 | 7891 | * @extack: netlink extended ack |
9ff162a8 JP |
7892 | * |
7893 | * Adds a link to device which is upper to this one. In this case, only | |
7894 | * one master upper device can be linked, although other non-master devices | |
7895 | * might be linked as well. The caller must hold the RTNL lock. | |
7896 | * On a failure a negative errno code is returned. On success the reference | |
7897 | * counts are adjusted and the function returns zero. | |
7898 | */ | |
7899 | int netdev_master_upper_dev_link(struct net_device *dev, | |
6dffb044 | 7900 | struct net_device *upper_dev, |
42ab19ee DA |
7901 | void *upper_priv, void *upper_info, |
7902 | struct netlink_ext_ack *extack) | |
9ff162a8 | 7903 | { |
1fc70edb TY |
7904 | struct netdev_nested_priv priv = { |
7905 | .flags = NESTED_SYNC_IMM | NESTED_SYNC_TODO, | |
7906 | .data = NULL, | |
7907 | }; | |
7908 | ||
29bf24af | 7909 | return __netdev_upper_dev_link(dev, upper_dev, true, |
1fc70edb | 7910 | upper_priv, upper_info, &priv, extack); |
9ff162a8 JP |
7911 | } |
7912 | EXPORT_SYMBOL(netdev_master_upper_dev_link); | |
7913 | ||
fe8300fd | 7914 | static void __netdev_upper_dev_unlink(struct net_device *dev, |
1fc70edb TY |
7915 | struct net_device *upper_dev, |
7916 | struct netdev_nested_priv *priv) | |
9ff162a8 | 7917 | { |
51d0c047 DA |
7918 | struct netdev_notifier_changeupper_info changeupper_info = { |
7919 | .info = { | |
7920 | .dev = dev, | |
7921 | }, | |
7922 | .upper_dev = upper_dev, | |
7923 | .linking = false, | |
7924 | }; | |
f4563a75 | 7925 | |
9ff162a8 JP |
7926 | ASSERT_RTNL(); |
7927 | ||
0e4ead9d | 7928 | changeupper_info.master = netdev_master_upper_dev_get(dev) == upper_dev; |
0e4ead9d | 7929 | |
51d0c047 | 7930 | call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER, |
573c7ba0 JP |
7931 | &changeupper_info.info); |
7932 | ||
2f268f12 | 7933 | __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev); |
5d261913 | 7934 | |
51d0c047 | 7935 | call_netdevice_notifiers_info(NETDEV_CHANGEUPPER, |
0e4ead9d | 7936 | &changeupper_info.info); |
5343da4c TY |
7937 | |
7938 | __netdev_update_upper_level(dev, NULL); | |
32b6d34f | 7939 | __netdev_walk_all_lower_dev(dev, __netdev_update_upper_level, NULL); |
5343da4c | 7940 | |
1fc70edb | 7941 | __netdev_update_lower_level(upper_dev, priv); |
32b6d34f | 7942 | __netdev_walk_all_upper_dev(upper_dev, __netdev_update_lower_level, |
1fc70edb | 7943 | priv); |
9ff162a8 | 7944 | } |
fe8300fd TY |
7945 | |
7946 | /** | |
7947 | * netdev_upper_dev_unlink - Removes a link to upper device | |
7948 | * @dev: device | |
7949 | * @upper_dev: new upper device | |
7950 | * | |
7951 | * Removes a link to device which is upper to this one. The caller must hold | |
7952 | * the RTNL lock. | |
7953 | */ | |
7954 | void netdev_upper_dev_unlink(struct net_device *dev, | |
7955 | struct net_device *upper_dev) | |
7956 | { | |
1fc70edb TY |
7957 | struct netdev_nested_priv priv = { |
7958 | .flags = NESTED_SYNC_TODO, | |
7959 | .data = NULL, | |
7960 | }; | |
7961 | ||
7962 | __netdev_upper_dev_unlink(dev, upper_dev, &priv); | |
9ff162a8 JP |
7963 | } |
7964 | EXPORT_SYMBOL(netdev_upper_dev_unlink); | |
7965 | ||
32b6d34f TY |
7966 | static void __netdev_adjacent_dev_set(struct net_device *upper_dev, |
7967 | struct net_device *lower_dev, | |
7968 | bool val) | |
7969 | { | |
7970 | struct netdev_adjacent *adj; | |
7971 | ||
7972 | adj = __netdev_find_adj(lower_dev, &upper_dev->adj_list.lower); | |
7973 | if (adj) | |
7974 | adj->ignore = val; | |
7975 | ||
7976 | adj = __netdev_find_adj(upper_dev, &lower_dev->adj_list.upper); | |
7977 | if (adj) | |
7978 | adj->ignore = val; | |
7979 | } | |
7980 | ||
7981 | static void netdev_adjacent_dev_disable(struct net_device *upper_dev, | |
7982 | struct net_device *lower_dev) | |
7983 | { | |
7984 | __netdev_adjacent_dev_set(upper_dev, lower_dev, true); | |
7985 | } | |
7986 | ||
7987 | static void netdev_adjacent_dev_enable(struct net_device *upper_dev, | |
7988 | struct net_device *lower_dev) | |
7989 | { | |
7990 | __netdev_adjacent_dev_set(upper_dev, lower_dev, false); | |
7991 | } | |
7992 | ||
7993 | int netdev_adjacent_change_prepare(struct net_device *old_dev, | |
7994 | struct net_device *new_dev, | |
7995 | struct net_device *dev, | |
7996 | struct netlink_ext_ack *extack) | |
7997 | { | |
1fc70edb TY |
7998 | struct netdev_nested_priv priv = { |
7999 | .flags = 0, | |
8000 | .data = NULL, | |
8001 | }; | |
32b6d34f TY |
8002 | int err; |
8003 | ||
8004 | if (!new_dev) | |
8005 | return 0; | |
8006 | ||
8007 | if (old_dev && new_dev != old_dev) | |
8008 | netdev_adjacent_dev_disable(dev, old_dev); | |
1fc70edb TY |
8009 | err = __netdev_upper_dev_link(new_dev, dev, false, NULL, NULL, &priv, |
8010 | extack); | |
32b6d34f TY |
8011 | if (err) { |
8012 | if (old_dev && new_dev != old_dev) | |
8013 | netdev_adjacent_dev_enable(dev, old_dev); | |
8014 | return err; | |
8015 | } | |
8016 | ||
8017 | return 0; | |
8018 | } | |
8019 | EXPORT_SYMBOL(netdev_adjacent_change_prepare); | |
8020 | ||
8021 | void netdev_adjacent_change_commit(struct net_device *old_dev, | |
8022 | struct net_device *new_dev, | |
8023 | struct net_device *dev) | |
8024 | { | |
1fc70edb TY |
8025 | struct netdev_nested_priv priv = { |
8026 | .flags = NESTED_SYNC_IMM | NESTED_SYNC_TODO, | |
8027 | .data = NULL, | |
8028 | }; | |
8029 | ||
32b6d34f TY |
8030 | if (!new_dev || !old_dev) |
8031 | return; | |
8032 | ||
8033 | if (new_dev == old_dev) | |
8034 | return; | |
8035 | ||
8036 | netdev_adjacent_dev_enable(dev, old_dev); | |
1fc70edb | 8037 | __netdev_upper_dev_unlink(old_dev, dev, &priv); |
32b6d34f TY |
8038 | } |
8039 | EXPORT_SYMBOL(netdev_adjacent_change_commit); | |
8040 | ||
8041 | void netdev_adjacent_change_abort(struct net_device *old_dev, | |
8042 | struct net_device *new_dev, | |
8043 | struct net_device *dev) | |
8044 | { | |
1fc70edb TY |
8045 | struct netdev_nested_priv priv = { |
8046 | .flags = 0, | |
8047 | .data = NULL, | |
8048 | }; | |
8049 | ||
32b6d34f TY |
8050 | if (!new_dev) |
8051 | return; | |
8052 | ||
8053 | if (old_dev && new_dev != old_dev) | |
8054 | netdev_adjacent_dev_enable(dev, old_dev); | |
8055 | ||
1fc70edb | 8056 | __netdev_upper_dev_unlink(new_dev, dev, &priv); |
32b6d34f TY |
8057 | } |
8058 | EXPORT_SYMBOL(netdev_adjacent_change_abort); | |
8059 | ||
61bd3857 MS |
8060 | /** |
8061 | * netdev_bonding_info_change - Dispatch event about slave change | |
8062 | * @dev: device | |
4a26e453 | 8063 | * @bonding_info: info to dispatch |
61bd3857 MS |
8064 | * |
8065 | * Send NETDEV_BONDING_INFO to netdev notifiers with info. | |
8066 | * The caller must hold the RTNL lock. | |
8067 | */ | |
8068 | void netdev_bonding_info_change(struct net_device *dev, | |
8069 | struct netdev_bonding_info *bonding_info) | |
8070 | { | |
51d0c047 DA |
8071 | struct netdev_notifier_bonding_info info = { |
8072 | .info.dev = dev, | |
8073 | }; | |
61bd3857 MS |
8074 | |
8075 | memcpy(&info.bonding_info, bonding_info, | |
8076 | sizeof(struct netdev_bonding_info)); | |
51d0c047 | 8077 | call_netdevice_notifiers_info(NETDEV_BONDING_INFO, |
61bd3857 MS |
8078 | &info.info); |
8079 | } | |
8080 | EXPORT_SYMBOL(netdev_bonding_info_change); | |
8081 | ||
cff9f12b MG |
8082 | /** |
8083 | * netdev_get_xmit_slave - Get the xmit slave of master device | |
8842500d | 8084 | * @dev: device |
cff9f12b MG |
8085 | * @skb: The packet |
8086 | * @all_slaves: assume all the slaves are active | |
8087 | * | |
8088 | * The reference counters are not incremented so the caller must be | |
8089 | * careful with locks. The caller must hold RCU lock. | |
8090 | * %NULL is returned if no slave is found. | |
8091 | */ | |
8092 | ||
8093 | struct net_device *netdev_get_xmit_slave(struct net_device *dev, | |
8094 | struct sk_buff *skb, | |
8095 | bool all_slaves) | |
8096 | { | |
8097 | const struct net_device_ops *ops = dev->netdev_ops; | |
8098 | ||
8099 | if (!ops->ndo_get_xmit_slave) | |
8100 | return NULL; | |
8101 | return ops->ndo_get_xmit_slave(dev, skb, all_slaves); | |
8102 | } | |
8103 | EXPORT_SYMBOL(netdev_get_xmit_slave); | |
8104 | ||
2ce1ee17 | 8105 | static void netdev_adjacent_add_links(struct net_device *dev) |
4c75431a AF |
8106 | { |
8107 | struct netdev_adjacent *iter; | |
8108 | ||
8109 | struct net *net = dev_net(dev); | |
8110 | ||
8111 | list_for_each_entry(iter, &dev->adj_list.upper, list) { | |
be4da0e3 | 8112 | if (!net_eq(net, dev_net(iter->dev))) |
4c75431a AF |
8113 | continue; |
8114 | netdev_adjacent_sysfs_add(iter->dev, dev, | |
8115 | &iter->dev->adj_list.lower); | |
8116 | netdev_adjacent_sysfs_add(dev, iter->dev, | |
8117 | &dev->adj_list.upper); | |
8118 | } | |
8119 | ||
8120 | list_for_each_entry(iter, &dev->adj_list.lower, list) { | |
be4da0e3 | 8121 | if (!net_eq(net, dev_net(iter->dev))) |
4c75431a AF |
8122 | continue; |
8123 | netdev_adjacent_sysfs_add(iter->dev, dev, | |
8124 | &iter->dev->adj_list.upper); | |
8125 | netdev_adjacent_sysfs_add(dev, iter->dev, | |
8126 | &dev->adj_list.lower); | |
8127 | } | |
8128 | } | |
8129 | ||
2ce1ee17 | 8130 | static void netdev_adjacent_del_links(struct net_device *dev) |
4c75431a AF |
8131 | { |
8132 | struct netdev_adjacent *iter; | |
8133 | ||
8134 | struct net *net = dev_net(dev); | |
8135 | ||
8136 | list_for_each_entry(iter, &dev->adj_list.upper, list) { | |
be4da0e3 | 8137 | if (!net_eq(net, dev_net(iter->dev))) |
4c75431a AF |
8138 | continue; |
8139 | netdev_adjacent_sysfs_del(iter->dev, dev->name, | |
8140 | &iter->dev->adj_list.lower); | |
8141 | netdev_adjacent_sysfs_del(dev, iter->dev->name, | |
8142 | &dev->adj_list.upper); | |
8143 | } | |
8144 | ||
8145 | list_for_each_entry(iter, &dev->adj_list.lower, list) { | |
be4da0e3 | 8146 | if (!net_eq(net, dev_net(iter->dev))) |
4c75431a AF |
8147 | continue; |
8148 | netdev_adjacent_sysfs_del(iter->dev, dev->name, | |
8149 | &iter->dev->adj_list.upper); | |
8150 | netdev_adjacent_sysfs_del(dev, iter->dev->name, | |
8151 | &dev->adj_list.lower); | |
8152 | } | |
8153 | } | |
8154 | ||
5bb025fa | 8155 | void netdev_adjacent_rename_links(struct net_device *dev, char *oldname) |
402dae96 | 8156 | { |
5bb025fa | 8157 | struct netdev_adjacent *iter; |
402dae96 | 8158 | |
4c75431a AF |
8159 | struct net *net = dev_net(dev); |
8160 | ||
5bb025fa | 8161 | list_for_each_entry(iter, &dev->adj_list.upper, list) { |
be4da0e3 | 8162 | if (!net_eq(net, dev_net(iter->dev))) |
4c75431a | 8163 | continue; |
5bb025fa VF |
8164 | netdev_adjacent_sysfs_del(iter->dev, oldname, |
8165 | &iter->dev->adj_list.lower); | |
8166 | netdev_adjacent_sysfs_add(iter->dev, dev, | |
8167 | &iter->dev->adj_list.lower); | |
8168 | } | |
402dae96 | 8169 | |
5bb025fa | 8170 | list_for_each_entry(iter, &dev->adj_list.lower, list) { |
be4da0e3 | 8171 | if (!net_eq(net, dev_net(iter->dev))) |
4c75431a | 8172 | continue; |
5bb025fa VF |
8173 | netdev_adjacent_sysfs_del(iter->dev, oldname, |
8174 | &iter->dev->adj_list.upper); | |
8175 | netdev_adjacent_sysfs_add(iter->dev, dev, | |
8176 | &iter->dev->adj_list.upper); | |
8177 | } | |
402dae96 | 8178 | } |
402dae96 VF |
8179 | |
8180 | void *netdev_lower_dev_get_private(struct net_device *dev, | |
8181 | struct net_device *lower_dev) | |
8182 | { | |
8183 | struct netdev_adjacent *lower; | |
8184 | ||
8185 | if (!lower_dev) | |
8186 | return NULL; | |
6ea29da1 | 8187 | lower = __netdev_find_adj(lower_dev, &dev->adj_list.lower); |
402dae96 VF |
8188 | if (!lower) |
8189 | return NULL; | |
8190 | ||
8191 | return lower->private; | |
8192 | } | |
8193 | EXPORT_SYMBOL(netdev_lower_dev_get_private); | |
8194 | ||
4085ebe8 | 8195 | |
04d48266 | 8196 | /** |
c1639be9 | 8197 | * netdev_lower_state_changed - Dispatch event about lower device state change |
04d48266 JP |
8198 | * @lower_dev: device |
8199 | * @lower_state_info: state to dispatch | |
8200 | * | |
8201 | * Send NETDEV_CHANGELOWERSTATE to netdev notifiers with info. | |
8202 | * The caller must hold the RTNL lock. | |
8203 | */ | |
8204 | void netdev_lower_state_changed(struct net_device *lower_dev, | |
8205 | void *lower_state_info) | |
8206 | { | |
51d0c047 DA |
8207 | struct netdev_notifier_changelowerstate_info changelowerstate_info = { |
8208 | .info.dev = lower_dev, | |
8209 | }; | |
04d48266 JP |
8210 | |
8211 | ASSERT_RTNL(); | |
8212 | changelowerstate_info.lower_state_info = lower_state_info; | |
51d0c047 | 8213 | call_netdevice_notifiers_info(NETDEV_CHANGELOWERSTATE, |
04d48266 JP |
8214 | &changelowerstate_info.info); |
8215 | } | |
8216 | EXPORT_SYMBOL(netdev_lower_state_changed); | |
8217 | ||
b6c40d68 PM |
8218 | static void dev_change_rx_flags(struct net_device *dev, int flags) |
8219 | { | |
d314774c SH |
8220 | const struct net_device_ops *ops = dev->netdev_ops; |
8221 | ||
d2615bf4 | 8222 | if (ops->ndo_change_rx_flags) |
d314774c | 8223 | ops->ndo_change_rx_flags(dev, flags); |
b6c40d68 PM |
8224 | } |
8225 | ||
991fb3f7 | 8226 | static int __dev_set_promiscuity(struct net_device *dev, int inc, bool notify) |
1da177e4 | 8227 | { |
b536db93 | 8228 | unsigned int old_flags = dev->flags; |
d04a48b0 EB |
8229 | kuid_t uid; |
8230 | kgid_t gid; | |
1da177e4 | 8231 | |
24023451 PM |
8232 | ASSERT_RTNL(); |
8233 | ||
dad9b335 WC |
8234 | dev->flags |= IFF_PROMISC; |
8235 | dev->promiscuity += inc; | |
8236 | if (dev->promiscuity == 0) { | |
8237 | /* | |
8238 | * Avoid overflow. | |
8239 | * If inc causes overflow, untouch promisc and return error. | |
8240 | */ | |
8241 | if (inc < 0) | |
8242 | dev->flags &= ~IFF_PROMISC; | |
8243 | else { | |
8244 | dev->promiscuity -= inc; | |
7b6cd1ce JP |
8245 | pr_warn("%s: promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n", |
8246 | dev->name); | |
dad9b335 WC |
8247 | return -EOVERFLOW; |
8248 | } | |
8249 | } | |
52609c0b | 8250 | if (dev->flags != old_flags) { |
7b6cd1ce JP |
8251 | pr_info("device %s %s promiscuous mode\n", |
8252 | dev->name, | |
8253 | dev->flags & IFF_PROMISC ? "entered" : "left"); | |
8192b0c4 DH |
8254 | if (audit_enabled) { |
8255 | current_uid_gid(&uid, &gid); | |
cdfb6b34 RGB |
8256 | audit_log(audit_context(), GFP_ATOMIC, |
8257 | AUDIT_ANOM_PROMISCUOUS, | |
8258 | "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u", | |
8259 | dev->name, (dev->flags & IFF_PROMISC), | |
8260 | (old_flags & IFF_PROMISC), | |
8261 | from_kuid(&init_user_ns, audit_get_loginuid(current)), | |
8262 | from_kuid(&init_user_ns, uid), | |
8263 | from_kgid(&init_user_ns, gid), | |
8264 | audit_get_sessionid(current)); | |
8192b0c4 | 8265 | } |
24023451 | 8266 | |
b6c40d68 | 8267 | dev_change_rx_flags(dev, IFF_PROMISC); |
1da177e4 | 8268 | } |
991fb3f7 ND |
8269 | if (notify) |
8270 | __dev_notify_flags(dev, old_flags, IFF_PROMISC); | |
dad9b335 | 8271 | return 0; |
1da177e4 LT |
8272 | } |
8273 | ||
4417da66 PM |
8274 | /** |
8275 | * dev_set_promiscuity - update promiscuity count on a device | |
8276 | * @dev: device | |
8277 | * @inc: modifier | |
8278 | * | |
8279 | * Add or remove promiscuity from a device. While the count in the device | |
8280 | * remains above zero the interface remains promiscuous. Once it hits zero | |
8281 | * the device reverts back to normal filtering operation. A negative inc | |
8282 | * value is used to drop promiscuity on the device. | |
dad9b335 | 8283 | * Return 0 if successful or a negative errno code on error. |
4417da66 | 8284 | */ |
dad9b335 | 8285 | int dev_set_promiscuity(struct net_device *dev, int inc) |
4417da66 | 8286 | { |
b536db93 | 8287 | unsigned int old_flags = dev->flags; |
dad9b335 | 8288 | int err; |
4417da66 | 8289 | |
991fb3f7 | 8290 | err = __dev_set_promiscuity(dev, inc, true); |
4b5a698e | 8291 | if (err < 0) |
dad9b335 | 8292 | return err; |
4417da66 PM |
8293 | if (dev->flags != old_flags) |
8294 | dev_set_rx_mode(dev); | |
dad9b335 | 8295 | return err; |
4417da66 | 8296 | } |
d1b19dff | 8297 | EXPORT_SYMBOL(dev_set_promiscuity); |
4417da66 | 8298 | |
991fb3f7 | 8299 | static int __dev_set_allmulti(struct net_device *dev, int inc, bool notify) |
1da177e4 | 8300 | { |
991fb3f7 | 8301 | unsigned int old_flags = dev->flags, old_gflags = dev->gflags; |
1da177e4 | 8302 | |
24023451 PM |
8303 | ASSERT_RTNL(); |
8304 | ||
1da177e4 | 8305 | dev->flags |= IFF_ALLMULTI; |
dad9b335 WC |
8306 | dev->allmulti += inc; |
8307 | if (dev->allmulti == 0) { | |
8308 | /* | |
8309 | * Avoid overflow. | |
8310 | * If inc causes overflow, untouch allmulti and return error. | |
8311 | */ | |
8312 | if (inc < 0) | |
8313 | dev->flags &= ~IFF_ALLMULTI; | |
8314 | else { | |
8315 | dev->allmulti -= inc; | |
7b6cd1ce JP |
8316 | pr_warn("%s: allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n", |
8317 | dev->name); | |
dad9b335 WC |
8318 | return -EOVERFLOW; |
8319 | } | |
8320 | } | |
24023451 | 8321 | if (dev->flags ^ old_flags) { |
b6c40d68 | 8322 | dev_change_rx_flags(dev, IFF_ALLMULTI); |
4417da66 | 8323 | dev_set_rx_mode(dev); |
991fb3f7 ND |
8324 | if (notify) |
8325 | __dev_notify_flags(dev, old_flags, | |
8326 | dev->gflags ^ old_gflags); | |
24023451 | 8327 | } |
dad9b335 | 8328 | return 0; |
4417da66 | 8329 | } |
991fb3f7 ND |
8330 | |
8331 | /** | |
8332 | * dev_set_allmulti - update allmulti count on a device | |
8333 | * @dev: device | |
8334 | * @inc: modifier | |
8335 | * | |
8336 | * Add or remove reception of all multicast frames to a device. While the | |
8337 | * count in the device remains above zero the interface remains listening | |
8338 | * to all interfaces. Once it hits zero the device reverts back to normal | |
8339 | * filtering operation. A negative @inc value is used to drop the counter | |
8340 | * when releasing a resource needing all multicasts. | |
8341 | * Return 0 if successful or a negative errno code on error. | |
8342 | */ | |
8343 | ||
8344 | int dev_set_allmulti(struct net_device *dev, int inc) | |
8345 | { | |
8346 | return __dev_set_allmulti(dev, inc, true); | |
8347 | } | |
d1b19dff | 8348 | EXPORT_SYMBOL(dev_set_allmulti); |
4417da66 PM |
8349 | |
8350 | /* | |
8351 | * Upload unicast and multicast address lists to device and | |
8352 | * configure RX filtering. When the device doesn't support unicast | |
53ccaae1 | 8353 | * filtering it is put in promiscuous mode while unicast addresses |
4417da66 PM |
8354 | * are present. |
8355 | */ | |
8356 | void __dev_set_rx_mode(struct net_device *dev) | |
8357 | { | |
d314774c SH |
8358 | const struct net_device_ops *ops = dev->netdev_ops; |
8359 | ||
4417da66 PM |
8360 | /* dev_open will call this function so the list will stay sane. */ |
8361 | if (!(dev->flags&IFF_UP)) | |
8362 | return; | |
8363 | ||
8364 | if (!netif_device_present(dev)) | |
40b77c94 | 8365 | return; |
4417da66 | 8366 | |
01789349 | 8367 | if (!(dev->priv_flags & IFF_UNICAST_FLT)) { |
4417da66 PM |
8368 | /* Unicast addresses changes may only happen under the rtnl, |
8369 | * therefore calling __dev_set_promiscuity here is safe. | |
8370 | */ | |
32e7bfc4 | 8371 | if (!netdev_uc_empty(dev) && !dev->uc_promisc) { |
991fb3f7 | 8372 | __dev_set_promiscuity(dev, 1, false); |
2d348d1f | 8373 | dev->uc_promisc = true; |
32e7bfc4 | 8374 | } else if (netdev_uc_empty(dev) && dev->uc_promisc) { |
991fb3f7 | 8375 | __dev_set_promiscuity(dev, -1, false); |
2d348d1f | 8376 | dev->uc_promisc = false; |
4417da66 | 8377 | } |
4417da66 | 8378 | } |
01789349 JP |
8379 | |
8380 | if (ops->ndo_set_rx_mode) | |
8381 | ops->ndo_set_rx_mode(dev); | |
4417da66 PM |
8382 | } |
8383 | ||
8384 | void dev_set_rx_mode(struct net_device *dev) | |
8385 | { | |
b9e40857 | 8386 | netif_addr_lock_bh(dev); |
4417da66 | 8387 | __dev_set_rx_mode(dev); |
b9e40857 | 8388 | netif_addr_unlock_bh(dev); |
1da177e4 LT |
8389 | } |
8390 | ||
f0db275a SH |
8391 | /** |
8392 | * dev_get_flags - get flags reported to userspace | |
8393 | * @dev: device | |
8394 | * | |
8395 | * Get the combination of flag bits exported through APIs to userspace. | |
8396 | */ | |
95c96174 | 8397 | unsigned int dev_get_flags(const struct net_device *dev) |
1da177e4 | 8398 | { |
95c96174 | 8399 | unsigned int flags; |
1da177e4 LT |
8400 | |
8401 | flags = (dev->flags & ~(IFF_PROMISC | | |
8402 | IFF_ALLMULTI | | |
b00055aa SR |
8403 | IFF_RUNNING | |
8404 | IFF_LOWER_UP | | |
8405 | IFF_DORMANT)) | | |
1da177e4 LT |
8406 | (dev->gflags & (IFF_PROMISC | |
8407 | IFF_ALLMULTI)); | |
8408 | ||
b00055aa SR |
8409 | if (netif_running(dev)) { |
8410 | if (netif_oper_up(dev)) | |
8411 | flags |= IFF_RUNNING; | |
8412 | if (netif_carrier_ok(dev)) | |
8413 | flags |= IFF_LOWER_UP; | |
8414 | if (netif_dormant(dev)) | |
8415 | flags |= IFF_DORMANT; | |
8416 | } | |
1da177e4 LT |
8417 | |
8418 | return flags; | |
8419 | } | |
d1b19dff | 8420 | EXPORT_SYMBOL(dev_get_flags); |
1da177e4 | 8421 | |
6d040321 PM |
8422 | int __dev_change_flags(struct net_device *dev, unsigned int flags, |
8423 | struct netlink_ext_ack *extack) | |
1da177e4 | 8424 | { |
b536db93 | 8425 | unsigned int old_flags = dev->flags; |
bd380811 | 8426 | int ret; |
1da177e4 | 8427 | |
24023451 PM |
8428 | ASSERT_RTNL(); |
8429 | ||
1da177e4 LT |
8430 | /* |
8431 | * Set the flags on our device. | |
8432 | */ | |
8433 | ||
8434 | dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP | | |
8435 | IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL | | |
8436 | IFF_AUTOMEDIA)) | | |
8437 | (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC | | |
8438 | IFF_ALLMULTI)); | |
8439 | ||
8440 | /* | |
8441 | * Load in the correct multicast list now the flags have changed. | |
8442 | */ | |
8443 | ||
b6c40d68 PM |
8444 | if ((old_flags ^ flags) & IFF_MULTICAST) |
8445 | dev_change_rx_flags(dev, IFF_MULTICAST); | |
24023451 | 8446 | |
4417da66 | 8447 | dev_set_rx_mode(dev); |
1da177e4 LT |
8448 | |
8449 | /* | |
8450 | * Have we downed the interface. We handle IFF_UP ourselves | |
8451 | * according to user attempts to set it, rather than blindly | |
8452 | * setting it. | |
8453 | */ | |
8454 | ||
8455 | ret = 0; | |
7051b88a | 8456 | if ((old_flags ^ flags) & IFF_UP) { |
8457 | if (old_flags & IFF_UP) | |
8458 | __dev_close(dev); | |
8459 | else | |
40c900aa | 8460 | ret = __dev_open(dev, extack); |
7051b88a | 8461 | } |
1da177e4 | 8462 | |
1da177e4 | 8463 | if ((flags ^ dev->gflags) & IFF_PROMISC) { |
d1b19dff | 8464 | int inc = (flags & IFF_PROMISC) ? 1 : -1; |
991fb3f7 | 8465 | unsigned int old_flags = dev->flags; |
d1b19dff | 8466 | |
1da177e4 | 8467 | dev->gflags ^= IFF_PROMISC; |
991fb3f7 ND |
8468 | |
8469 | if (__dev_set_promiscuity(dev, inc, false) >= 0) | |
8470 | if (dev->flags != old_flags) | |
8471 | dev_set_rx_mode(dev); | |
1da177e4 LT |
8472 | } |
8473 | ||
8474 | /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI | |
eb13da1a | 8475 | * is important. Some (broken) drivers set IFF_PROMISC, when |
8476 | * IFF_ALLMULTI is requested not asking us and not reporting. | |
1da177e4 LT |
8477 | */ |
8478 | if ((flags ^ dev->gflags) & IFF_ALLMULTI) { | |
d1b19dff ED |
8479 | int inc = (flags & IFF_ALLMULTI) ? 1 : -1; |
8480 | ||
1da177e4 | 8481 | dev->gflags ^= IFF_ALLMULTI; |
991fb3f7 | 8482 | __dev_set_allmulti(dev, inc, false); |
1da177e4 LT |
8483 | } |
8484 | ||
bd380811 PM |
8485 | return ret; |
8486 | } | |
8487 | ||
a528c219 ND |
8488 | void __dev_notify_flags(struct net_device *dev, unsigned int old_flags, |
8489 | unsigned int gchanges) | |
bd380811 PM |
8490 | { |
8491 | unsigned int changes = dev->flags ^ old_flags; | |
8492 | ||
a528c219 | 8493 | if (gchanges) |
7f294054 | 8494 | rtmsg_ifinfo(RTM_NEWLINK, dev, gchanges, GFP_ATOMIC); |
a528c219 | 8495 | |
bd380811 PM |
8496 | if (changes & IFF_UP) { |
8497 | if (dev->flags & IFF_UP) | |
8498 | call_netdevice_notifiers(NETDEV_UP, dev); | |
8499 | else | |
8500 | call_netdevice_notifiers(NETDEV_DOWN, dev); | |
8501 | } | |
8502 | ||
8503 | if (dev->flags & IFF_UP && | |
be9efd36 | 8504 | (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE))) { |
51d0c047 DA |
8505 | struct netdev_notifier_change_info change_info = { |
8506 | .info = { | |
8507 | .dev = dev, | |
8508 | }, | |
8509 | .flags_changed = changes, | |
8510 | }; | |
be9efd36 | 8511 | |
51d0c047 | 8512 | call_netdevice_notifiers_info(NETDEV_CHANGE, &change_info.info); |
be9efd36 | 8513 | } |
bd380811 PM |
8514 | } |
8515 | ||
8516 | /** | |
8517 | * dev_change_flags - change device settings | |
8518 | * @dev: device | |
8519 | * @flags: device state flags | |
567c5e13 | 8520 | * @extack: netlink extended ack |
bd380811 PM |
8521 | * |
8522 | * Change settings on device based state flags. The flags are | |
8523 | * in the userspace exported format. | |
8524 | */ | |
567c5e13 PM |
8525 | int dev_change_flags(struct net_device *dev, unsigned int flags, |
8526 | struct netlink_ext_ack *extack) | |
bd380811 | 8527 | { |
b536db93 | 8528 | int ret; |
991fb3f7 | 8529 | unsigned int changes, old_flags = dev->flags, old_gflags = dev->gflags; |
bd380811 | 8530 | |
6d040321 | 8531 | ret = __dev_change_flags(dev, flags, extack); |
bd380811 PM |
8532 | if (ret < 0) |
8533 | return ret; | |
8534 | ||
991fb3f7 | 8535 | changes = (old_flags ^ dev->flags) | (old_gflags ^ dev->gflags); |
a528c219 | 8536 | __dev_notify_flags(dev, old_flags, changes); |
1da177e4 LT |
8537 | return ret; |
8538 | } | |
d1b19dff | 8539 | EXPORT_SYMBOL(dev_change_flags); |
1da177e4 | 8540 | |
f51048c3 | 8541 | int __dev_set_mtu(struct net_device *dev, int new_mtu) |
2315dc91 VF |
8542 | { |
8543 | const struct net_device_ops *ops = dev->netdev_ops; | |
8544 | ||
8545 | if (ops->ndo_change_mtu) | |
8546 | return ops->ndo_change_mtu(dev, new_mtu); | |
8547 | ||
501a90c9 ED |
8548 | /* Pairs with all the lockless reads of dev->mtu in the stack */ |
8549 | WRITE_ONCE(dev->mtu, new_mtu); | |
2315dc91 VF |
8550 | return 0; |
8551 | } | |
f51048c3 | 8552 | EXPORT_SYMBOL(__dev_set_mtu); |
2315dc91 | 8553 | |
d836f5c6 ED |
8554 | int dev_validate_mtu(struct net_device *dev, int new_mtu, |
8555 | struct netlink_ext_ack *extack) | |
8556 | { | |
8557 | /* MTU must be positive, and in range */ | |
8558 | if (new_mtu < 0 || new_mtu < dev->min_mtu) { | |
8559 | NL_SET_ERR_MSG(extack, "mtu less than device minimum"); | |
8560 | return -EINVAL; | |
8561 | } | |
8562 | ||
8563 | if (dev->max_mtu > 0 && new_mtu > dev->max_mtu) { | |
8564 | NL_SET_ERR_MSG(extack, "mtu greater than device maximum"); | |
8565 | return -EINVAL; | |
8566 | } | |
8567 | return 0; | |
8568 | } | |
8569 | ||
f0db275a | 8570 | /** |
7a4c53be | 8571 | * dev_set_mtu_ext - Change maximum transfer unit |
f0db275a SH |
8572 | * @dev: device |
8573 | * @new_mtu: new transfer unit | |
7a4c53be | 8574 | * @extack: netlink extended ack |
f0db275a SH |
8575 | * |
8576 | * Change the maximum transfer size of the network device. | |
8577 | */ | |
7a4c53be SH |
8578 | int dev_set_mtu_ext(struct net_device *dev, int new_mtu, |
8579 | struct netlink_ext_ack *extack) | |
1da177e4 | 8580 | { |
2315dc91 | 8581 | int err, orig_mtu; |
1da177e4 LT |
8582 | |
8583 | if (new_mtu == dev->mtu) | |
8584 | return 0; | |
8585 | ||
d836f5c6 ED |
8586 | err = dev_validate_mtu(dev, new_mtu, extack); |
8587 | if (err) | |
8588 | return err; | |
1da177e4 LT |
8589 | |
8590 | if (!netif_device_present(dev)) | |
8591 | return -ENODEV; | |
8592 | ||
1d486bfb VF |
8593 | err = call_netdevice_notifiers(NETDEV_PRECHANGEMTU, dev); |
8594 | err = notifier_to_errno(err); | |
8595 | if (err) | |
8596 | return err; | |
d314774c | 8597 | |
2315dc91 VF |
8598 | orig_mtu = dev->mtu; |
8599 | err = __dev_set_mtu(dev, new_mtu); | |
d314774c | 8600 | |
2315dc91 | 8601 | if (!err) { |
af7d6cce SD |
8602 | err = call_netdevice_notifiers_mtu(NETDEV_CHANGEMTU, dev, |
8603 | orig_mtu); | |
2315dc91 VF |
8604 | err = notifier_to_errno(err); |
8605 | if (err) { | |
8606 | /* setting mtu back and notifying everyone again, | |
8607 | * so that they have a chance to revert changes. | |
8608 | */ | |
8609 | __dev_set_mtu(dev, orig_mtu); | |
af7d6cce SD |
8610 | call_netdevice_notifiers_mtu(NETDEV_CHANGEMTU, dev, |
8611 | new_mtu); | |
2315dc91 VF |
8612 | } |
8613 | } | |
1da177e4 LT |
8614 | return err; |
8615 | } | |
7a4c53be SH |
8616 | |
8617 | int dev_set_mtu(struct net_device *dev, int new_mtu) | |
8618 | { | |
8619 | struct netlink_ext_ack extack; | |
8620 | int err; | |
8621 | ||
a6bcfc89 | 8622 | memset(&extack, 0, sizeof(extack)); |
7a4c53be | 8623 | err = dev_set_mtu_ext(dev, new_mtu, &extack); |
a6bcfc89 | 8624 | if (err && extack._msg) |
7a4c53be SH |
8625 | net_err_ratelimited("%s: %s\n", dev->name, extack._msg); |
8626 | return err; | |
8627 | } | |
d1b19dff | 8628 | EXPORT_SYMBOL(dev_set_mtu); |
1da177e4 | 8629 | |
6a643ddb CW |
8630 | /** |
8631 | * dev_change_tx_queue_len - Change TX queue length of a netdevice | |
8632 | * @dev: device | |
8633 | * @new_len: new tx queue length | |
8634 | */ | |
8635 | int dev_change_tx_queue_len(struct net_device *dev, unsigned long new_len) | |
8636 | { | |
8637 | unsigned int orig_len = dev->tx_queue_len; | |
8638 | int res; | |
8639 | ||
8640 | if (new_len != (unsigned int)new_len) | |
8641 | return -ERANGE; | |
8642 | ||
8643 | if (new_len != orig_len) { | |
8644 | dev->tx_queue_len = new_len; | |
8645 | res = call_netdevice_notifiers(NETDEV_CHANGE_TX_QUEUE_LEN, dev); | |
8646 | res = notifier_to_errno(res); | |
7effaf06 TT |
8647 | if (res) |
8648 | goto err_rollback; | |
8649 | res = dev_qdisc_change_tx_queue_len(dev); | |
8650 | if (res) | |
8651 | goto err_rollback; | |
6a643ddb CW |
8652 | } |
8653 | ||
8654 | return 0; | |
7effaf06 TT |
8655 | |
8656 | err_rollback: | |
8657 | netdev_err(dev, "refused to change device tx_queue_len\n"); | |
8658 | dev->tx_queue_len = orig_len; | |
8659 | return res; | |
6a643ddb CW |
8660 | } |
8661 | ||
cbda10fa VD |
8662 | /** |
8663 | * dev_set_group - Change group this device belongs to | |
8664 | * @dev: device | |
8665 | * @new_group: group this device should belong to | |
8666 | */ | |
8667 | void dev_set_group(struct net_device *dev, int new_group) | |
8668 | { | |
8669 | dev->group = new_group; | |
8670 | } | |
8671 | EXPORT_SYMBOL(dev_set_group); | |
8672 | ||
d59cdf94 PM |
8673 | /** |
8674 | * dev_pre_changeaddr_notify - Call NETDEV_PRE_CHANGEADDR. | |
8675 | * @dev: device | |
8676 | * @addr: new address | |
8677 | * @extack: netlink extended ack | |
8678 | */ | |
8679 | int dev_pre_changeaddr_notify(struct net_device *dev, const char *addr, | |
8680 | struct netlink_ext_ack *extack) | |
8681 | { | |
8682 | struct netdev_notifier_pre_changeaddr_info info = { | |
8683 | .info.dev = dev, | |
8684 | .info.extack = extack, | |
8685 | .dev_addr = addr, | |
8686 | }; | |
8687 | int rc; | |
8688 | ||
8689 | rc = call_netdevice_notifiers_info(NETDEV_PRE_CHANGEADDR, &info.info); | |
8690 | return notifier_to_errno(rc); | |
8691 | } | |
8692 | EXPORT_SYMBOL(dev_pre_changeaddr_notify); | |
8693 | ||
f0db275a SH |
8694 | /** |
8695 | * dev_set_mac_address - Change Media Access Control Address | |
8696 | * @dev: device | |
8697 | * @sa: new address | |
3a37a963 | 8698 | * @extack: netlink extended ack |
f0db275a SH |
8699 | * |
8700 | * Change the hardware (MAC) address of the device | |
8701 | */ | |
3a37a963 PM |
8702 | int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa, |
8703 | struct netlink_ext_ack *extack) | |
1da177e4 | 8704 | { |
d314774c | 8705 | const struct net_device_ops *ops = dev->netdev_ops; |
1da177e4 LT |
8706 | int err; |
8707 | ||
d314774c | 8708 | if (!ops->ndo_set_mac_address) |
1da177e4 LT |
8709 | return -EOPNOTSUPP; |
8710 | if (sa->sa_family != dev->type) | |
8711 | return -EINVAL; | |
8712 | if (!netif_device_present(dev)) | |
8713 | return -ENODEV; | |
d59cdf94 PM |
8714 | err = dev_pre_changeaddr_notify(dev, sa->sa_data, extack); |
8715 | if (err) | |
8716 | return err; | |
d314774c | 8717 | err = ops->ndo_set_mac_address(dev, sa); |
f6521516 JP |
8718 | if (err) |
8719 | return err; | |
fbdeca2d | 8720 | dev->addr_assign_type = NET_ADDR_SET; |
f6521516 | 8721 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); |
7bf23575 | 8722 | add_device_randomness(dev->dev_addr, dev->addr_len); |
f6521516 | 8723 | return 0; |
1da177e4 | 8724 | } |
d1b19dff | 8725 | EXPORT_SYMBOL(dev_set_mac_address); |
1da177e4 | 8726 | |
4bf84c35 JP |
8727 | /** |
8728 | * dev_change_carrier - Change device carrier | |
8729 | * @dev: device | |
691b3b7e | 8730 | * @new_carrier: new value |
4bf84c35 JP |
8731 | * |
8732 | * Change device carrier | |
8733 | */ | |
8734 | int dev_change_carrier(struct net_device *dev, bool new_carrier) | |
8735 | { | |
8736 | const struct net_device_ops *ops = dev->netdev_ops; | |
8737 | ||
8738 | if (!ops->ndo_change_carrier) | |
8739 | return -EOPNOTSUPP; | |
8740 | if (!netif_device_present(dev)) | |
8741 | return -ENODEV; | |
8742 | return ops->ndo_change_carrier(dev, new_carrier); | |
8743 | } | |
8744 | EXPORT_SYMBOL(dev_change_carrier); | |
8745 | ||
66b52b0d JP |
8746 | /** |
8747 | * dev_get_phys_port_id - Get device physical port ID | |
8748 | * @dev: device | |
8749 | * @ppid: port ID | |
8750 | * | |
8751 | * Get device physical port ID | |
8752 | */ | |
8753 | int dev_get_phys_port_id(struct net_device *dev, | |
02637fce | 8754 | struct netdev_phys_item_id *ppid) |
66b52b0d JP |
8755 | { |
8756 | const struct net_device_ops *ops = dev->netdev_ops; | |
8757 | ||
8758 | if (!ops->ndo_get_phys_port_id) | |
8759 | return -EOPNOTSUPP; | |
8760 | return ops->ndo_get_phys_port_id(dev, ppid); | |
8761 | } | |
8762 | EXPORT_SYMBOL(dev_get_phys_port_id); | |
8763 | ||
db24a904 DA |
8764 | /** |
8765 | * dev_get_phys_port_name - Get device physical port name | |
8766 | * @dev: device | |
8767 | * @name: port name | |
ed49e650 | 8768 | * @len: limit of bytes to copy to name |
db24a904 DA |
8769 | * |
8770 | * Get device physical port name | |
8771 | */ | |
8772 | int dev_get_phys_port_name(struct net_device *dev, | |
8773 | char *name, size_t len) | |
8774 | { | |
8775 | const struct net_device_ops *ops = dev->netdev_ops; | |
af3836df | 8776 | int err; |
db24a904 | 8777 | |
af3836df JP |
8778 | if (ops->ndo_get_phys_port_name) { |
8779 | err = ops->ndo_get_phys_port_name(dev, name, len); | |
8780 | if (err != -EOPNOTSUPP) | |
8781 | return err; | |
8782 | } | |
8783 | return devlink_compat_phys_port_name_get(dev, name, len); | |
db24a904 DA |
8784 | } |
8785 | EXPORT_SYMBOL(dev_get_phys_port_name); | |
8786 | ||
d6abc596 FF |
8787 | /** |
8788 | * dev_get_port_parent_id - Get the device's port parent identifier | |
8789 | * @dev: network device | |
8790 | * @ppid: pointer to a storage for the port's parent identifier | |
8791 | * @recurse: allow/disallow recursion to lower devices | |
8792 | * | |
8793 | * Get the devices's port parent identifier | |
8794 | */ | |
8795 | int dev_get_port_parent_id(struct net_device *dev, | |
8796 | struct netdev_phys_item_id *ppid, | |
8797 | bool recurse) | |
8798 | { | |
8799 | const struct net_device_ops *ops = dev->netdev_ops; | |
8800 | struct netdev_phys_item_id first = { }; | |
8801 | struct net_device *lower_dev; | |
8802 | struct list_head *iter; | |
7e1146e8 JP |
8803 | int err; |
8804 | ||
8805 | if (ops->ndo_get_port_parent_id) { | |
8806 | err = ops->ndo_get_port_parent_id(dev, ppid); | |
8807 | if (err != -EOPNOTSUPP) | |
8808 | return err; | |
8809 | } | |
d6abc596 | 8810 | |
7e1146e8 JP |
8811 | err = devlink_compat_switch_id_get(dev, ppid); |
8812 | if (!err || err != -EOPNOTSUPP) | |
8813 | return err; | |
d6abc596 FF |
8814 | |
8815 | if (!recurse) | |
7e1146e8 | 8816 | return -EOPNOTSUPP; |
d6abc596 FF |
8817 | |
8818 | netdev_for_each_lower_dev(dev, lower_dev, iter) { | |
8819 | err = dev_get_port_parent_id(lower_dev, ppid, recurse); | |
8820 | if (err) | |
8821 | break; | |
8822 | if (!first.id_len) | |
8823 | first = *ppid; | |
8824 | else if (memcmp(&first, ppid, sizeof(*ppid))) | |
e1b9efe6 | 8825 | return -EOPNOTSUPP; |
d6abc596 FF |
8826 | } |
8827 | ||
8828 | return err; | |
8829 | } | |
8830 | EXPORT_SYMBOL(dev_get_port_parent_id); | |
8831 | ||
8832 | /** | |
8833 | * netdev_port_same_parent_id - Indicate if two network devices have | |
8834 | * the same port parent identifier | |
8835 | * @a: first network device | |
8836 | * @b: second network device | |
8837 | */ | |
8838 | bool netdev_port_same_parent_id(struct net_device *a, struct net_device *b) | |
8839 | { | |
8840 | struct netdev_phys_item_id a_id = { }; | |
8841 | struct netdev_phys_item_id b_id = { }; | |
8842 | ||
8843 | if (dev_get_port_parent_id(a, &a_id, true) || | |
8844 | dev_get_port_parent_id(b, &b_id, true)) | |
8845 | return false; | |
8846 | ||
8847 | return netdev_phys_item_id_same(&a_id, &b_id); | |
8848 | } | |
8849 | EXPORT_SYMBOL(netdev_port_same_parent_id); | |
8850 | ||
d746d707 AK |
8851 | /** |
8852 | * dev_change_proto_down - update protocol port state information | |
8853 | * @dev: device | |
8854 | * @proto_down: new value | |
8855 | * | |
8856 | * This info can be used by switch drivers to set the phys state of the | |
8857 | * port. | |
8858 | */ | |
8859 | int dev_change_proto_down(struct net_device *dev, bool proto_down) | |
8860 | { | |
8861 | const struct net_device_ops *ops = dev->netdev_ops; | |
8862 | ||
8863 | if (!ops->ndo_change_proto_down) | |
8864 | return -EOPNOTSUPP; | |
8865 | if (!netif_device_present(dev)) | |
8866 | return -ENODEV; | |
8867 | return ops->ndo_change_proto_down(dev, proto_down); | |
8868 | } | |
8869 | EXPORT_SYMBOL(dev_change_proto_down); | |
8870 | ||
b5899679 AR |
8871 | /** |
8872 | * dev_change_proto_down_generic - generic implementation for | |
8873 | * ndo_change_proto_down that sets carrier according to | |
8874 | * proto_down. | |
8875 | * | |
8876 | * @dev: device | |
8877 | * @proto_down: new value | |
8878 | */ | |
8879 | int dev_change_proto_down_generic(struct net_device *dev, bool proto_down) | |
8880 | { | |
8881 | if (proto_down) | |
8882 | netif_carrier_off(dev); | |
8883 | else | |
8884 | netif_carrier_on(dev); | |
8885 | dev->proto_down = proto_down; | |
8886 | return 0; | |
8887 | } | |
8888 | EXPORT_SYMBOL(dev_change_proto_down_generic); | |
8889 | ||
829eb208 RP |
8890 | /** |
8891 | * dev_change_proto_down_reason - proto down reason | |
8892 | * | |
8893 | * @dev: device | |
8894 | * @mask: proto down mask | |
8895 | * @value: proto down value | |
8896 | */ | |
8897 | void dev_change_proto_down_reason(struct net_device *dev, unsigned long mask, | |
8898 | u32 value) | |
8899 | { | |
8900 | int b; | |
8901 | ||
8902 | if (!mask) { | |
8903 | dev->proto_down_reason = value; | |
8904 | } else { | |
8905 | for_each_set_bit(b, &mask, 32) { | |
8906 | if (value & (1 << b)) | |
8907 | dev->proto_down_reason |= BIT(b); | |
8908 | else | |
8909 | dev->proto_down_reason &= ~BIT(b); | |
8910 | } | |
8911 | } | |
8912 | } | |
8913 | EXPORT_SYMBOL(dev_change_proto_down_reason); | |
8914 | ||
aa8d3a71 AN |
8915 | struct bpf_xdp_link { |
8916 | struct bpf_link link; | |
8917 | struct net_device *dev; /* protected by rtnl_lock, no refcnt held */ | |
8918 | int flags; | |
8919 | }; | |
8920 | ||
c8a36f19 | 8921 | static enum bpf_xdp_mode dev_xdp_mode(struct net_device *dev, u32 flags) |
d67b9cd2 | 8922 | { |
7f0a8382 AN |
8923 | if (flags & XDP_FLAGS_HW_MODE) |
8924 | return XDP_MODE_HW; | |
8925 | if (flags & XDP_FLAGS_DRV_MODE) | |
8926 | return XDP_MODE_DRV; | |
c8a36f19 AN |
8927 | if (flags & XDP_FLAGS_SKB_MODE) |
8928 | return XDP_MODE_SKB; | |
8929 | return dev->netdev_ops->ndo_bpf ? XDP_MODE_DRV : XDP_MODE_SKB; | |
7f0a8382 | 8930 | } |
d67b9cd2 | 8931 | |
7f0a8382 AN |
8932 | static bpf_op_t dev_xdp_bpf_op(struct net_device *dev, enum bpf_xdp_mode mode) |
8933 | { | |
8934 | switch (mode) { | |
8935 | case XDP_MODE_SKB: | |
8936 | return generic_xdp_install; | |
8937 | case XDP_MODE_DRV: | |
8938 | case XDP_MODE_HW: | |
8939 | return dev->netdev_ops->ndo_bpf; | |
8940 | default: | |
8941 | return NULL; | |
5d867245 | 8942 | } |
7f0a8382 | 8943 | } |
118b4aa2 | 8944 | |
aa8d3a71 AN |
8945 | static struct bpf_xdp_link *dev_xdp_link(struct net_device *dev, |
8946 | enum bpf_xdp_mode mode) | |
8947 | { | |
8948 | return dev->xdp_state[mode].link; | |
8949 | } | |
8950 | ||
7f0a8382 AN |
8951 | static struct bpf_prog *dev_xdp_prog(struct net_device *dev, |
8952 | enum bpf_xdp_mode mode) | |
8953 | { | |
aa8d3a71 AN |
8954 | struct bpf_xdp_link *link = dev_xdp_link(dev, mode); |
8955 | ||
8956 | if (link) | |
8957 | return link->link.prog; | |
7f0a8382 AN |
8958 | return dev->xdp_state[mode].prog; |
8959 | } | |
8960 | ||
998f1729 THJ |
8961 | static u8 dev_xdp_prog_count(struct net_device *dev) |
8962 | { | |
8963 | u8 count = 0; | |
8964 | int i; | |
8965 | ||
8966 | for (i = 0; i < __MAX_XDP_MODE; i++) | |
8967 | if (dev->xdp_state[i].prog || dev->xdp_state[i].link) | |
8968 | count++; | |
8969 | return count; | |
8970 | } | |
8971 | ||
7f0a8382 AN |
8972 | u32 dev_xdp_prog_id(struct net_device *dev, enum bpf_xdp_mode mode) |
8973 | { | |
8974 | struct bpf_prog *prog = dev_xdp_prog(dev, mode); | |
118b4aa2 | 8975 | |
7f0a8382 AN |
8976 | return prog ? prog->aux->id : 0; |
8977 | } | |
58038695 | 8978 | |
aa8d3a71 AN |
8979 | static void dev_xdp_set_link(struct net_device *dev, enum bpf_xdp_mode mode, |
8980 | struct bpf_xdp_link *link) | |
8981 | { | |
8982 | dev->xdp_state[mode].link = link; | |
8983 | dev->xdp_state[mode].prog = NULL; | |
d67b9cd2 DB |
8984 | } |
8985 | ||
7f0a8382 AN |
8986 | static void dev_xdp_set_prog(struct net_device *dev, enum bpf_xdp_mode mode, |
8987 | struct bpf_prog *prog) | |
8988 | { | |
aa8d3a71 | 8989 | dev->xdp_state[mode].link = NULL; |
7f0a8382 | 8990 | dev->xdp_state[mode].prog = prog; |
d67b9cd2 DB |
8991 | } |
8992 | ||
7f0a8382 AN |
8993 | static int dev_xdp_install(struct net_device *dev, enum bpf_xdp_mode mode, |
8994 | bpf_op_t bpf_op, struct netlink_ext_ack *extack, | |
8995 | u32 flags, struct bpf_prog *prog) | |
d67b9cd2 | 8996 | { |
f4e63525 | 8997 | struct netdev_bpf xdp; |
7e6897f9 BT |
8998 | int err; |
8999 | ||
d67b9cd2 | 9000 | memset(&xdp, 0, sizeof(xdp)); |
7f0a8382 | 9001 | xdp.command = mode == XDP_MODE_HW ? XDP_SETUP_PROG_HW : XDP_SETUP_PROG; |
d67b9cd2 | 9002 | xdp.extack = extack; |
32d60277 | 9003 | xdp.flags = flags; |
d67b9cd2 DB |
9004 | xdp.prog = prog; |
9005 | ||
7f0a8382 AN |
9006 | /* Drivers assume refcnt is already incremented (i.e, prog pointer is |
9007 | * "moved" into driver), so they don't increment it on their own, but | |
9008 | * they do decrement refcnt when program is detached or replaced. | |
9009 | * Given net_device also owns link/prog, we need to bump refcnt here | |
9010 | * to prevent drivers from underflowing it. | |
9011 | */ | |
9012 | if (prog) | |
9013 | bpf_prog_inc(prog); | |
7e6897f9 | 9014 | err = bpf_op(dev, &xdp); |
7f0a8382 AN |
9015 | if (err) { |
9016 | if (prog) | |
9017 | bpf_prog_put(prog); | |
9018 | return err; | |
9019 | } | |
7e6897f9 | 9020 | |
7f0a8382 AN |
9021 | if (mode != XDP_MODE_HW) |
9022 | bpf_prog_change_xdp(dev_xdp_prog(dev, mode), prog); | |
7e6897f9 | 9023 | |
7f0a8382 | 9024 | return 0; |
d67b9cd2 DB |
9025 | } |
9026 | ||
bd0b2e7f JK |
9027 | static void dev_xdp_uninstall(struct net_device *dev) |
9028 | { | |
aa8d3a71 | 9029 | struct bpf_xdp_link *link; |
7f0a8382 AN |
9030 | struct bpf_prog *prog; |
9031 | enum bpf_xdp_mode mode; | |
9032 | bpf_op_t bpf_op; | |
bd0b2e7f | 9033 | |
7f0a8382 | 9034 | ASSERT_RTNL(); |
bd0b2e7f | 9035 | |
7f0a8382 AN |
9036 | for (mode = XDP_MODE_SKB; mode < __MAX_XDP_MODE; mode++) { |
9037 | prog = dev_xdp_prog(dev, mode); | |
9038 | if (!prog) | |
9039 | continue; | |
bd0b2e7f | 9040 | |
7f0a8382 AN |
9041 | bpf_op = dev_xdp_bpf_op(dev, mode); |
9042 | if (!bpf_op) | |
9043 | continue; | |
bd0b2e7f | 9044 | |
7f0a8382 AN |
9045 | WARN_ON(dev_xdp_install(dev, mode, bpf_op, NULL, 0, NULL)); |
9046 | ||
aa8d3a71 AN |
9047 | /* auto-detach link from net device */ |
9048 | link = dev_xdp_link(dev, mode); | |
9049 | if (link) | |
9050 | link->dev = NULL; | |
9051 | else | |
9052 | bpf_prog_put(prog); | |
9053 | ||
9054 | dev_xdp_set_link(dev, mode, NULL); | |
7f0a8382 | 9055 | } |
bd0b2e7f JK |
9056 | } |
9057 | ||
d4baa936 | 9058 | static int dev_xdp_attach(struct net_device *dev, struct netlink_ext_ack *extack, |
aa8d3a71 AN |
9059 | struct bpf_xdp_link *link, struct bpf_prog *new_prog, |
9060 | struct bpf_prog *old_prog, u32 flags) | |
a7862b45 | 9061 | { |
998f1729 | 9062 | unsigned int num_modes = hweight32(flags & XDP_FLAGS_MODES); |
d4baa936 AN |
9063 | struct bpf_prog *cur_prog; |
9064 | enum bpf_xdp_mode mode; | |
7f0a8382 | 9065 | bpf_op_t bpf_op; |
a7862b45 BB |
9066 | int err; |
9067 | ||
85de8576 DB |
9068 | ASSERT_RTNL(); |
9069 | ||
aa8d3a71 AN |
9070 | /* either link or prog attachment, never both */ |
9071 | if (link && (new_prog || old_prog)) | |
9072 | return -EINVAL; | |
9073 | /* link supports only XDP mode flags */ | |
9074 | if (link && (flags & ~XDP_FLAGS_MODES)) { | |
9075 | NL_SET_ERR_MSG(extack, "Invalid XDP flags for BPF link attachment"); | |
9076 | return -EINVAL; | |
9077 | } | |
998f1729 THJ |
9078 | /* just one XDP mode bit should be set, zero defaults to drv/skb mode */ |
9079 | if (num_modes > 1) { | |
d4baa936 AN |
9080 | NL_SET_ERR_MSG(extack, "Only one XDP mode flag can be set"); |
9081 | return -EINVAL; | |
9082 | } | |
998f1729 THJ |
9083 | /* avoid ambiguity if offload + drv/skb mode progs are both loaded */ |
9084 | if (!num_modes && dev_xdp_prog_count(dev) > 1) { | |
9085 | NL_SET_ERR_MSG(extack, | |
9086 | "More than one program loaded, unset mode is ambiguous"); | |
9087 | return -EINVAL; | |
9088 | } | |
d4baa936 AN |
9089 | /* old_prog != NULL implies XDP_FLAGS_REPLACE is set */ |
9090 | if (old_prog && !(flags & XDP_FLAGS_REPLACE)) { | |
9091 | NL_SET_ERR_MSG(extack, "XDP_FLAGS_REPLACE is not specified"); | |
9092 | return -EINVAL; | |
01dde20c | 9093 | } |
a25717d2 | 9094 | |
c8a36f19 | 9095 | mode = dev_xdp_mode(dev, flags); |
aa8d3a71 AN |
9096 | /* can't replace attached link */ |
9097 | if (dev_xdp_link(dev, mode)) { | |
9098 | NL_SET_ERR_MSG(extack, "Can't replace active BPF XDP link"); | |
9099 | return -EBUSY; | |
01dde20c | 9100 | } |
c14a9f63 | 9101 | |
d4baa936 | 9102 | cur_prog = dev_xdp_prog(dev, mode); |
aa8d3a71 AN |
9103 | /* can't replace attached prog with link */ |
9104 | if (link && cur_prog) { | |
9105 | NL_SET_ERR_MSG(extack, "Can't replace active XDP program with BPF link"); | |
9106 | return -EBUSY; | |
9107 | } | |
d4baa936 AN |
9108 | if ((flags & XDP_FLAGS_REPLACE) && cur_prog != old_prog) { |
9109 | NL_SET_ERR_MSG(extack, "Active program does not match expected"); | |
9110 | return -EEXIST; | |
92234c8f | 9111 | } |
c14a9f63 | 9112 | |
aa8d3a71 AN |
9113 | /* put effective new program into new_prog */ |
9114 | if (link) | |
9115 | new_prog = link->link.prog; | |
85de8576 | 9116 | |
d4baa936 AN |
9117 | if (new_prog) { |
9118 | bool offload = mode == XDP_MODE_HW; | |
7f0a8382 AN |
9119 | enum bpf_xdp_mode other_mode = mode == XDP_MODE_SKB |
9120 | ? XDP_MODE_DRV : XDP_MODE_SKB; | |
441a3303 | 9121 | |
068d9d1e AN |
9122 | if ((flags & XDP_FLAGS_UPDATE_IF_NOEXIST) && cur_prog) { |
9123 | NL_SET_ERR_MSG(extack, "XDP program already attached"); | |
9124 | return -EBUSY; | |
9125 | } | |
d4baa936 | 9126 | if (!offload && dev_xdp_prog(dev, other_mode)) { |
7f0a8382 | 9127 | NL_SET_ERR_MSG(extack, "Native and generic XDP can't be active at the same time"); |
d67b9cd2 | 9128 | return -EEXIST; |
01dde20c | 9129 | } |
d4baa936 | 9130 | if (!offload && bpf_prog_is_dev_bound(new_prog->aux)) { |
7f0a8382 | 9131 | NL_SET_ERR_MSG(extack, "Using device-bound program without HW_MODE flag is not supported"); |
441a3303 JK |
9132 | return -EINVAL; |
9133 | } | |
d4baa936 | 9134 | if (new_prog->expected_attach_type == BPF_XDP_DEVMAP) { |
fbee97fe | 9135 | NL_SET_ERR_MSG(extack, "BPF_XDP_DEVMAP programs can not be attached to a device"); |
fbee97fe DA |
9136 | return -EINVAL; |
9137 | } | |
d4baa936 AN |
9138 | if (new_prog->expected_attach_type == BPF_XDP_CPUMAP) { |
9139 | NL_SET_ERR_MSG(extack, "BPF_XDP_CPUMAP programs can not be attached to a device"); | |
92164774 LB |
9140 | return -EINVAL; |
9141 | } | |
d4baa936 | 9142 | } |
92164774 | 9143 | |
d4baa936 AN |
9144 | /* don't call drivers if the effective program didn't change */ |
9145 | if (new_prog != cur_prog) { | |
9146 | bpf_op = dev_xdp_bpf_op(dev, mode); | |
9147 | if (!bpf_op) { | |
9148 | NL_SET_ERR_MSG(extack, "Underlying driver does not support XDP in native mode"); | |
9149 | return -EOPNOTSUPP; | |
c14a9f63 | 9150 | } |
a7862b45 | 9151 | |
d4baa936 AN |
9152 | err = dev_xdp_install(dev, mode, bpf_op, extack, flags, new_prog); |
9153 | if (err) | |
9154 | return err; | |
7f0a8382 | 9155 | } |
d4baa936 | 9156 | |
aa8d3a71 AN |
9157 | if (link) |
9158 | dev_xdp_set_link(dev, mode, link); | |
9159 | else | |
9160 | dev_xdp_set_prog(dev, mode, new_prog); | |
d4baa936 AN |
9161 | if (cur_prog) |
9162 | bpf_prog_put(cur_prog); | |
a7862b45 | 9163 | |
7f0a8382 | 9164 | return 0; |
a7862b45 | 9165 | } |
a7862b45 | 9166 | |
aa8d3a71 AN |
9167 | static int dev_xdp_attach_link(struct net_device *dev, |
9168 | struct netlink_ext_ack *extack, | |
9169 | struct bpf_xdp_link *link) | |
9170 | { | |
9171 | return dev_xdp_attach(dev, extack, link, NULL, NULL, link->flags); | |
9172 | } | |
9173 | ||
9174 | static int dev_xdp_detach_link(struct net_device *dev, | |
9175 | struct netlink_ext_ack *extack, | |
9176 | struct bpf_xdp_link *link) | |
9177 | { | |
9178 | enum bpf_xdp_mode mode; | |
9179 | bpf_op_t bpf_op; | |
9180 | ||
9181 | ASSERT_RTNL(); | |
9182 | ||
c8a36f19 | 9183 | mode = dev_xdp_mode(dev, link->flags); |
aa8d3a71 AN |
9184 | if (dev_xdp_link(dev, mode) != link) |
9185 | return -EINVAL; | |
9186 | ||
9187 | bpf_op = dev_xdp_bpf_op(dev, mode); | |
9188 | WARN_ON(dev_xdp_install(dev, mode, bpf_op, NULL, 0, NULL)); | |
9189 | dev_xdp_set_link(dev, mode, NULL); | |
9190 | return 0; | |
9191 | } | |
9192 | ||
9193 | static void bpf_xdp_link_release(struct bpf_link *link) | |
9194 | { | |
9195 | struct bpf_xdp_link *xdp_link = container_of(link, struct bpf_xdp_link, link); | |
9196 | ||
9197 | rtnl_lock(); | |
9198 | ||
9199 | /* if racing with net_device's tear down, xdp_link->dev might be | |
9200 | * already NULL, in which case link was already auto-detached | |
9201 | */ | |
73b11c2a | 9202 | if (xdp_link->dev) { |
aa8d3a71 | 9203 | WARN_ON(dev_xdp_detach_link(xdp_link->dev, NULL, xdp_link)); |
73b11c2a AN |
9204 | xdp_link->dev = NULL; |
9205 | } | |
aa8d3a71 AN |
9206 | |
9207 | rtnl_unlock(); | |
9208 | } | |
9209 | ||
73b11c2a AN |
9210 | static int bpf_xdp_link_detach(struct bpf_link *link) |
9211 | { | |
9212 | bpf_xdp_link_release(link); | |
9213 | return 0; | |
9214 | } | |
9215 | ||
aa8d3a71 AN |
9216 | static void bpf_xdp_link_dealloc(struct bpf_link *link) |
9217 | { | |
9218 | struct bpf_xdp_link *xdp_link = container_of(link, struct bpf_xdp_link, link); | |
9219 | ||
9220 | kfree(xdp_link); | |
9221 | } | |
9222 | ||
c1931c97 AN |
9223 | static void bpf_xdp_link_show_fdinfo(const struct bpf_link *link, |
9224 | struct seq_file *seq) | |
9225 | { | |
9226 | struct bpf_xdp_link *xdp_link = container_of(link, struct bpf_xdp_link, link); | |
9227 | u32 ifindex = 0; | |
9228 | ||
9229 | rtnl_lock(); | |
9230 | if (xdp_link->dev) | |
9231 | ifindex = xdp_link->dev->ifindex; | |
9232 | rtnl_unlock(); | |
9233 | ||
9234 | seq_printf(seq, "ifindex:\t%u\n", ifindex); | |
9235 | } | |
9236 | ||
9237 | static int bpf_xdp_link_fill_link_info(const struct bpf_link *link, | |
9238 | struct bpf_link_info *info) | |
9239 | { | |
9240 | struct bpf_xdp_link *xdp_link = container_of(link, struct bpf_xdp_link, link); | |
9241 | u32 ifindex = 0; | |
9242 | ||
9243 | rtnl_lock(); | |
9244 | if (xdp_link->dev) | |
9245 | ifindex = xdp_link->dev->ifindex; | |
9246 | rtnl_unlock(); | |
9247 | ||
9248 | info->xdp.ifindex = ifindex; | |
9249 | return 0; | |
9250 | } | |
9251 | ||
026a4c28 AN |
9252 | static int bpf_xdp_link_update(struct bpf_link *link, struct bpf_prog *new_prog, |
9253 | struct bpf_prog *old_prog) | |
9254 | { | |
9255 | struct bpf_xdp_link *xdp_link = container_of(link, struct bpf_xdp_link, link); | |
9256 | enum bpf_xdp_mode mode; | |
9257 | bpf_op_t bpf_op; | |
9258 | int err = 0; | |
9259 | ||
9260 | rtnl_lock(); | |
9261 | ||
9262 | /* link might have been auto-released already, so fail */ | |
9263 | if (!xdp_link->dev) { | |
9264 | err = -ENOLINK; | |
9265 | goto out_unlock; | |
9266 | } | |
9267 | ||
9268 | if (old_prog && link->prog != old_prog) { | |
9269 | err = -EPERM; | |
9270 | goto out_unlock; | |
9271 | } | |
9272 | old_prog = link->prog; | |
9273 | if (old_prog == new_prog) { | |
9274 | /* no-op, don't disturb drivers */ | |
9275 | bpf_prog_put(new_prog); | |
9276 | goto out_unlock; | |
9277 | } | |
9278 | ||
c8a36f19 | 9279 | mode = dev_xdp_mode(xdp_link->dev, xdp_link->flags); |
026a4c28 AN |
9280 | bpf_op = dev_xdp_bpf_op(xdp_link->dev, mode); |
9281 | err = dev_xdp_install(xdp_link->dev, mode, bpf_op, NULL, | |
9282 | xdp_link->flags, new_prog); | |
9283 | if (err) | |
9284 | goto out_unlock; | |
9285 | ||
9286 | old_prog = xchg(&link->prog, new_prog); | |
9287 | bpf_prog_put(old_prog); | |
9288 | ||
9289 | out_unlock: | |
9290 | rtnl_unlock(); | |
9291 | return err; | |
9292 | } | |
9293 | ||
aa8d3a71 AN |
9294 | static const struct bpf_link_ops bpf_xdp_link_lops = { |
9295 | .release = bpf_xdp_link_release, | |
9296 | .dealloc = bpf_xdp_link_dealloc, | |
73b11c2a | 9297 | .detach = bpf_xdp_link_detach, |
c1931c97 AN |
9298 | .show_fdinfo = bpf_xdp_link_show_fdinfo, |
9299 | .fill_link_info = bpf_xdp_link_fill_link_info, | |
026a4c28 | 9300 | .update_prog = bpf_xdp_link_update, |
aa8d3a71 AN |
9301 | }; |
9302 | ||
9303 | int bpf_xdp_link_attach(const union bpf_attr *attr, struct bpf_prog *prog) | |
9304 | { | |
9305 | struct net *net = current->nsproxy->net_ns; | |
9306 | struct bpf_link_primer link_primer; | |
9307 | struct bpf_xdp_link *link; | |
9308 | struct net_device *dev; | |
9309 | int err, fd; | |
9310 | ||
9311 | dev = dev_get_by_index(net, attr->link_create.target_ifindex); | |
9312 | if (!dev) | |
9313 | return -EINVAL; | |
9314 | ||
9315 | link = kzalloc(sizeof(*link), GFP_USER); | |
9316 | if (!link) { | |
9317 | err = -ENOMEM; | |
9318 | goto out_put_dev; | |
9319 | } | |
9320 | ||
9321 | bpf_link_init(&link->link, BPF_LINK_TYPE_XDP, &bpf_xdp_link_lops, prog); | |
9322 | link->dev = dev; | |
9323 | link->flags = attr->link_create.flags; | |
9324 | ||
9325 | err = bpf_link_prime(&link->link, &link_primer); | |
9326 | if (err) { | |
9327 | kfree(link); | |
9328 | goto out_put_dev; | |
9329 | } | |
9330 | ||
9331 | rtnl_lock(); | |
9332 | err = dev_xdp_attach_link(dev, NULL, link); | |
9333 | rtnl_unlock(); | |
9334 | ||
9335 | if (err) { | |
9336 | bpf_link_cleanup(&link_primer); | |
9337 | goto out_put_dev; | |
9338 | } | |
9339 | ||
9340 | fd = bpf_link_settle(&link_primer); | |
9341 | /* link itself doesn't hold dev's refcnt to not complicate shutdown */ | |
9342 | dev_put(dev); | |
9343 | return fd; | |
9344 | ||
9345 | out_put_dev: | |
9346 | dev_put(dev); | |
9347 | return err; | |
9348 | } | |
9349 | ||
d4baa936 AN |
9350 | /** |
9351 | * dev_change_xdp_fd - set or clear a bpf program for a device rx path | |
9352 | * @dev: device | |
9353 | * @extack: netlink extended ack | |
9354 | * @fd: new program fd or negative value to clear | |
9355 | * @expected_fd: old program fd that userspace expects to replace or clear | |
9356 | * @flags: xdp-related flags | |
9357 | * | |
9358 | * Set or clear a bpf program for a device | |
9359 | */ | |
9360 | int dev_change_xdp_fd(struct net_device *dev, struct netlink_ext_ack *extack, | |
9361 | int fd, int expected_fd, u32 flags) | |
9362 | { | |
c8a36f19 | 9363 | enum bpf_xdp_mode mode = dev_xdp_mode(dev, flags); |
d4baa936 AN |
9364 | struct bpf_prog *new_prog = NULL, *old_prog = NULL; |
9365 | int err; | |
9366 | ||
9367 | ASSERT_RTNL(); | |
9368 | ||
9369 | if (fd >= 0) { | |
9370 | new_prog = bpf_prog_get_type_dev(fd, BPF_PROG_TYPE_XDP, | |
9371 | mode != XDP_MODE_SKB); | |
9372 | if (IS_ERR(new_prog)) | |
9373 | return PTR_ERR(new_prog); | |
9374 | } | |
9375 | ||
9376 | if (expected_fd >= 0) { | |
9377 | old_prog = bpf_prog_get_type_dev(expected_fd, BPF_PROG_TYPE_XDP, | |
9378 | mode != XDP_MODE_SKB); | |
9379 | if (IS_ERR(old_prog)) { | |
9380 | err = PTR_ERR(old_prog); | |
9381 | old_prog = NULL; | |
9382 | goto err_out; | |
c14a9f63 | 9383 | } |
a7862b45 BB |
9384 | } |
9385 | ||
aa8d3a71 | 9386 | err = dev_xdp_attach(dev, extack, NULL, new_prog, old_prog, flags); |
a7862b45 | 9387 | |
d4baa936 AN |
9388 | err_out: |
9389 | if (err && new_prog) | |
9390 | bpf_prog_put(new_prog); | |
9391 | if (old_prog) | |
9392 | bpf_prog_put(old_prog); | |
a7862b45 BB |
9393 | return err; |
9394 | } | |
a7862b45 | 9395 | |
1da177e4 LT |
9396 | /** |
9397 | * dev_new_index - allocate an ifindex | |
c4ea43c5 | 9398 | * @net: the applicable net namespace |
1da177e4 LT |
9399 | * |
9400 | * Returns a suitable unique value for a new device interface | |
9401 | * number. The caller must hold the rtnl semaphore or the | |
9402 | * dev_base_lock to be sure it remains unique. | |
9403 | */ | |
881d966b | 9404 | static int dev_new_index(struct net *net) |
1da177e4 | 9405 | { |
aa79e66e | 9406 | int ifindex = net->ifindex; |
f4563a75 | 9407 | |
1da177e4 LT |
9408 | for (;;) { |
9409 | if (++ifindex <= 0) | |
9410 | ifindex = 1; | |
881d966b | 9411 | if (!__dev_get_by_index(net, ifindex)) |
aa79e66e | 9412 | return net->ifindex = ifindex; |
1da177e4 LT |
9413 | } |
9414 | } | |
9415 | ||
1da177e4 | 9416 | /* Delayed registration/unregisteration */ |
3b5b34fd | 9417 | static LIST_HEAD(net_todo_list); |
200b916f | 9418 | DECLARE_WAIT_QUEUE_HEAD(netdev_unregistering_wq); |
1da177e4 | 9419 | |
6f05f629 | 9420 | static void net_set_todo(struct net_device *dev) |
1da177e4 | 9421 | { |
1da177e4 | 9422 | list_add_tail(&dev->todo_list, &net_todo_list); |
50624c93 | 9423 | dev_net(dev)->dev_unreg_count++; |
1da177e4 LT |
9424 | } |
9425 | ||
9b5e383c | 9426 | static void rollback_registered_many(struct list_head *head) |
93ee31f1 | 9427 | { |
e93737b0 | 9428 | struct net_device *dev, *tmp; |
5cde2829 | 9429 | LIST_HEAD(close_head); |
9b5e383c | 9430 | |
93ee31f1 DL |
9431 | BUG_ON(dev_boot_phase); |
9432 | ASSERT_RTNL(); | |
9433 | ||
e93737b0 | 9434 | list_for_each_entry_safe(dev, tmp, head, unreg_list) { |
9b5e383c | 9435 | /* Some devices call without registering |
e93737b0 KK |
9436 | * for initialization unwind. Remove those |
9437 | * devices and proceed with the remaining. | |
9b5e383c ED |
9438 | */ |
9439 | if (dev->reg_state == NETREG_UNINITIALIZED) { | |
7b6cd1ce JP |
9440 | pr_debug("unregister_netdevice: device %s/%p never was registered\n", |
9441 | dev->name, dev); | |
93ee31f1 | 9442 | |
9b5e383c | 9443 | WARN_ON(1); |
e93737b0 KK |
9444 | list_del(&dev->unreg_list); |
9445 | continue; | |
9b5e383c | 9446 | } |
449f4544 | 9447 | dev->dismantle = true; |
9b5e383c | 9448 | BUG_ON(dev->reg_state != NETREG_REGISTERED); |
44345724 | 9449 | } |
93ee31f1 | 9450 | |
44345724 | 9451 | /* If device is running, close it first. */ |
5cde2829 EB |
9452 | list_for_each_entry(dev, head, unreg_list) |
9453 | list_add_tail(&dev->close_list, &close_head); | |
99c4a26a | 9454 | dev_close_many(&close_head, true); |
93ee31f1 | 9455 | |
44345724 | 9456 | list_for_each_entry(dev, head, unreg_list) { |
9b5e383c ED |
9457 | /* And unlink it from device chain. */ |
9458 | unlist_netdevice(dev); | |
93ee31f1 | 9459 | |
9b5e383c ED |
9460 | dev->reg_state = NETREG_UNREGISTERING; |
9461 | } | |
41852497 | 9462 | flush_all_backlogs(); |
93ee31f1 DL |
9463 | |
9464 | synchronize_net(); | |
9465 | ||
9b5e383c | 9466 | list_for_each_entry(dev, head, unreg_list) { |
395eea6c MB |
9467 | struct sk_buff *skb = NULL; |
9468 | ||
9b5e383c ED |
9469 | /* Shutdown queueing discipline. */ |
9470 | dev_shutdown(dev); | |
93ee31f1 | 9471 | |
bd0b2e7f | 9472 | dev_xdp_uninstall(dev); |
93ee31f1 | 9473 | |
9b5e383c | 9474 | /* Notify protocols, that we are about to destroy |
eb13da1a | 9475 | * this device. They should clean all the things. |
9476 | */ | |
9b5e383c | 9477 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); |
93ee31f1 | 9478 | |
395eea6c MB |
9479 | if (!dev->rtnl_link_ops || |
9480 | dev->rtnl_link_state == RTNL_LINK_INITIALIZED) | |
3d3ea5af | 9481 | skb = rtmsg_ifinfo_build_skb(RTM_DELLINK, dev, ~0U, 0, |
38e01b30 | 9482 | GFP_KERNEL, NULL, 0); |
395eea6c | 9483 | |
9b5e383c ED |
9484 | /* |
9485 | * Flush the unicast and multicast chains | |
9486 | */ | |
a748ee24 | 9487 | dev_uc_flush(dev); |
22bedad3 | 9488 | dev_mc_flush(dev); |
93ee31f1 | 9489 | |
36fbf1e5 | 9490 | netdev_name_node_alt_flush(dev); |
ff927412 JP |
9491 | netdev_name_node_free(dev->name_node); |
9492 | ||
9b5e383c ED |
9493 | if (dev->netdev_ops->ndo_uninit) |
9494 | dev->netdev_ops->ndo_uninit(dev); | |
93ee31f1 | 9495 | |
395eea6c MB |
9496 | if (skb) |
9497 | rtmsg_ifinfo_send(skb, dev, GFP_KERNEL); | |
56bfa7ee | 9498 | |
9ff162a8 JP |
9499 | /* Notifier chain MUST detach us all upper devices. */ |
9500 | WARN_ON(netdev_has_any_upper_dev(dev)); | |
0f524a80 | 9501 | WARN_ON(netdev_has_any_lower_dev(dev)); |
93ee31f1 | 9502 | |
9b5e383c ED |
9503 | /* Remove entries from kobject tree */ |
9504 | netdev_unregister_kobject(dev); | |
024e9679 AD |
9505 | #ifdef CONFIG_XPS |
9506 | /* Remove XPS queueing entries */ | |
9507 | netif_reset_xps_queues_gt(dev, 0); | |
9508 | #endif | |
9b5e383c | 9509 | } |
93ee31f1 | 9510 | |
850a545b | 9511 | synchronize_net(); |
395264d5 | 9512 | |
a5ee1551 | 9513 | list_for_each_entry(dev, head, unreg_list) |
9b5e383c ED |
9514 | dev_put(dev); |
9515 | } | |
9516 | ||
9517 | static void rollback_registered(struct net_device *dev) | |
9518 | { | |
9519 | LIST_HEAD(single); | |
9520 | ||
9521 | list_add(&dev->unreg_list, &single); | |
9522 | rollback_registered_many(&single); | |
ceaaec98 | 9523 | list_del(&single); |
93ee31f1 DL |
9524 | } |
9525 | ||
fd867d51 JW |
9526 | static netdev_features_t netdev_sync_upper_features(struct net_device *lower, |
9527 | struct net_device *upper, netdev_features_t features) | |
9528 | { | |
9529 | netdev_features_t upper_disables = NETIF_F_UPPER_DISABLES; | |
9530 | netdev_features_t feature; | |
5ba3f7d6 | 9531 | int feature_bit; |
fd867d51 | 9532 | |
3b89ea9c | 9533 | for_each_netdev_feature(upper_disables, feature_bit) { |
5ba3f7d6 | 9534 | feature = __NETIF_F_BIT(feature_bit); |
fd867d51 JW |
9535 | if (!(upper->wanted_features & feature) |
9536 | && (features & feature)) { | |
9537 | netdev_dbg(lower, "Dropping feature %pNF, upper dev %s has it off.\n", | |
9538 | &feature, upper->name); | |
9539 | features &= ~feature; | |
9540 | } | |
9541 | } | |
9542 | ||
9543 | return features; | |
9544 | } | |
9545 | ||
9546 | static void netdev_sync_lower_features(struct net_device *upper, | |
9547 | struct net_device *lower, netdev_features_t features) | |
9548 | { | |
9549 | netdev_features_t upper_disables = NETIF_F_UPPER_DISABLES; | |
9550 | netdev_features_t feature; | |
5ba3f7d6 | 9551 | int feature_bit; |
fd867d51 | 9552 | |
3b89ea9c | 9553 | for_each_netdev_feature(upper_disables, feature_bit) { |
5ba3f7d6 | 9554 | feature = __NETIF_F_BIT(feature_bit); |
fd867d51 JW |
9555 | if (!(features & feature) && (lower->features & feature)) { |
9556 | netdev_dbg(upper, "Disabling feature %pNF on lower dev %s.\n", | |
9557 | &feature, lower->name); | |
9558 | lower->wanted_features &= ~feature; | |
dd912306 | 9559 | __netdev_update_features(lower); |
fd867d51 JW |
9560 | |
9561 | if (unlikely(lower->features & feature)) | |
9562 | netdev_WARN(upper, "failed to disable %pNF on %s!\n", | |
9563 | &feature, lower->name); | |
dd912306 CW |
9564 | else |
9565 | netdev_features_change(lower); | |
fd867d51 JW |
9566 | } |
9567 | } | |
9568 | } | |
9569 | ||
c8f44aff MM |
9570 | static netdev_features_t netdev_fix_features(struct net_device *dev, |
9571 | netdev_features_t features) | |
b63365a2 | 9572 | { |
57422dc5 MM |
9573 | /* Fix illegal checksum combinations */ |
9574 | if ((features & NETIF_F_HW_CSUM) && | |
9575 | (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) { | |
6f404e44 | 9576 | netdev_warn(dev, "mixed HW and IP checksum settings.\n"); |
57422dc5 MM |
9577 | features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM); |
9578 | } | |
9579 | ||
b63365a2 | 9580 | /* TSO requires that SG is present as well. */ |
ea2d3688 | 9581 | if ((features & NETIF_F_ALL_TSO) && !(features & NETIF_F_SG)) { |
6f404e44 | 9582 | netdev_dbg(dev, "Dropping TSO features since no SG feature.\n"); |
ea2d3688 | 9583 | features &= ~NETIF_F_ALL_TSO; |
b63365a2 HX |
9584 | } |
9585 | ||
ec5f0615 PS |
9586 | if ((features & NETIF_F_TSO) && !(features & NETIF_F_HW_CSUM) && |
9587 | !(features & NETIF_F_IP_CSUM)) { | |
9588 | netdev_dbg(dev, "Dropping TSO features since no CSUM feature.\n"); | |
9589 | features &= ~NETIF_F_TSO; | |
9590 | features &= ~NETIF_F_TSO_ECN; | |
9591 | } | |
9592 | ||
9593 | if ((features & NETIF_F_TSO6) && !(features & NETIF_F_HW_CSUM) && | |
9594 | !(features & NETIF_F_IPV6_CSUM)) { | |
9595 | netdev_dbg(dev, "Dropping TSO6 features since no CSUM feature.\n"); | |
9596 | features &= ~NETIF_F_TSO6; | |
9597 | } | |
9598 | ||
b1dc497b AD |
9599 | /* TSO with IPv4 ID mangling requires IPv4 TSO be enabled */ |
9600 | if ((features & NETIF_F_TSO_MANGLEID) && !(features & NETIF_F_TSO)) | |
9601 | features &= ~NETIF_F_TSO_MANGLEID; | |
9602 | ||
31d8b9e0 BH |
9603 | /* TSO ECN requires that TSO is present as well. */ |
9604 | if ((features & NETIF_F_ALL_TSO) == NETIF_F_TSO_ECN) | |
9605 | features &= ~NETIF_F_TSO_ECN; | |
9606 | ||
212b573f MM |
9607 | /* Software GSO depends on SG. */ |
9608 | if ((features & NETIF_F_GSO) && !(features & NETIF_F_SG)) { | |
6f404e44 | 9609 | netdev_dbg(dev, "Dropping NETIF_F_GSO since no SG feature.\n"); |
212b573f MM |
9610 | features &= ~NETIF_F_GSO; |
9611 | } | |
9612 | ||
802ab55a AD |
9613 | /* GSO partial features require GSO partial be set */ |
9614 | if ((features & dev->gso_partial_features) && | |
9615 | !(features & NETIF_F_GSO_PARTIAL)) { | |
9616 | netdev_dbg(dev, | |
9617 | "Dropping partially supported GSO features since no GSO partial.\n"); | |
9618 | features &= ~dev->gso_partial_features; | |
9619 | } | |
9620 | ||
fb1f5f79 MC |
9621 | if (!(features & NETIF_F_RXCSUM)) { |
9622 | /* NETIF_F_GRO_HW implies doing RXCSUM since every packet | |
9623 | * successfully merged by hardware must also have the | |
9624 | * checksum verified by hardware. If the user does not | |
9625 | * want to enable RXCSUM, logically, we should disable GRO_HW. | |
9626 | */ | |
9627 | if (features & NETIF_F_GRO_HW) { | |
9628 | netdev_dbg(dev, "Dropping NETIF_F_GRO_HW since no RXCSUM feature.\n"); | |
9629 | features &= ~NETIF_F_GRO_HW; | |
9630 | } | |
9631 | } | |
9632 | ||
de8d5ab2 GP |
9633 | /* LRO/HW-GRO features cannot be combined with RX-FCS */ |
9634 | if (features & NETIF_F_RXFCS) { | |
9635 | if (features & NETIF_F_LRO) { | |
9636 | netdev_dbg(dev, "Dropping LRO feature since RX-FCS is requested.\n"); | |
9637 | features &= ~NETIF_F_LRO; | |
9638 | } | |
9639 | ||
9640 | if (features & NETIF_F_GRO_HW) { | |
9641 | netdev_dbg(dev, "Dropping HW-GRO feature since RX-FCS is requested.\n"); | |
9642 | features &= ~NETIF_F_GRO_HW; | |
9643 | } | |
e6c6a929 GP |
9644 | } |
9645 | ||
ae0b04b2 TT |
9646 | if ((features & NETIF_F_HW_TLS_TX) && !(features & NETIF_F_HW_CSUM)) { |
9647 | netdev_dbg(dev, "Dropping TLS TX HW offload feature since no CSUM feature.\n"); | |
9648 | features &= ~NETIF_F_HW_TLS_TX; | |
9649 | } | |
9650 | ||
b63365a2 HX |
9651 | return features; |
9652 | } | |
b63365a2 | 9653 | |
6cb6a27c | 9654 | int __netdev_update_features(struct net_device *dev) |
5455c699 | 9655 | { |
fd867d51 | 9656 | struct net_device *upper, *lower; |
c8f44aff | 9657 | netdev_features_t features; |
fd867d51 | 9658 | struct list_head *iter; |
e7868a85 | 9659 | int err = -1; |
5455c699 | 9660 | |
87267485 MM |
9661 | ASSERT_RTNL(); |
9662 | ||
5455c699 MM |
9663 | features = netdev_get_wanted_features(dev); |
9664 | ||
9665 | if (dev->netdev_ops->ndo_fix_features) | |
9666 | features = dev->netdev_ops->ndo_fix_features(dev, features); | |
9667 | ||
9668 | /* driver might be less strict about feature dependencies */ | |
9669 | features = netdev_fix_features(dev, features); | |
9670 | ||
4250b75b | 9671 | /* some features can't be enabled if they're off on an upper device */ |
fd867d51 JW |
9672 | netdev_for_each_upper_dev_rcu(dev, upper, iter) |
9673 | features = netdev_sync_upper_features(dev, upper, features); | |
9674 | ||
5455c699 | 9675 | if (dev->features == features) |
e7868a85 | 9676 | goto sync_lower; |
5455c699 | 9677 | |
c8f44aff MM |
9678 | netdev_dbg(dev, "Features changed: %pNF -> %pNF\n", |
9679 | &dev->features, &features); | |
5455c699 MM |
9680 | |
9681 | if (dev->netdev_ops->ndo_set_features) | |
9682 | err = dev->netdev_ops->ndo_set_features(dev, features); | |
5f8dc33e NA |
9683 | else |
9684 | err = 0; | |
5455c699 | 9685 | |
6cb6a27c | 9686 | if (unlikely(err < 0)) { |
5455c699 | 9687 | netdev_err(dev, |
c8f44aff MM |
9688 | "set_features() failed (%d); wanted %pNF, left %pNF\n", |
9689 | err, &features, &dev->features); | |
17b85d29 NA |
9690 | /* return non-0 since some features might have changed and |
9691 | * it's better to fire a spurious notification than miss it | |
9692 | */ | |
9693 | return -1; | |
6cb6a27c MM |
9694 | } |
9695 | ||
e7868a85 | 9696 | sync_lower: |
fd867d51 JW |
9697 | /* some features must be disabled on lower devices when disabled |
9698 | * on an upper device (think: bonding master or bridge) | |
9699 | */ | |
9700 | netdev_for_each_lower_dev(dev, lower, iter) | |
9701 | netdev_sync_lower_features(dev, lower, features); | |
9702 | ||
ae847f40 SD |
9703 | if (!err) { |
9704 | netdev_features_t diff = features ^ dev->features; | |
9705 | ||
9706 | if (diff & NETIF_F_RX_UDP_TUNNEL_PORT) { | |
9707 | /* udp_tunnel_{get,drop}_rx_info both need | |
9708 | * NETIF_F_RX_UDP_TUNNEL_PORT enabled on the | |
9709 | * device, or they won't do anything. | |
9710 | * Thus we need to update dev->features | |
9711 | * *before* calling udp_tunnel_get_rx_info, | |
9712 | * but *after* calling udp_tunnel_drop_rx_info. | |
9713 | */ | |
9714 | if (features & NETIF_F_RX_UDP_TUNNEL_PORT) { | |
9715 | dev->features = features; | |
9716 | udp_tunnel_get_rx_info(dev); | |
9717 | } else { | |
9718 | udp_tunnel_drop_rx_info(dev); | |
9719 | } | |
9720 | } | |
9721 | ||
9daae9bd GP |
9722 | if (diff & NETIF_F_HW_VLAN_CTAG_FILTER) { |
9723 | if (features & NETIF_F_HW_VLAN_CTAG_FILTER) { | |
9724 | dev->features = features; | |
9725 | err |= vlan_get_rx_ctag_filter_info(dev); | |
9726 | } else { | |
9727 | vlan_drop_rx_ctag_filter_info(dev); | |
9728 | } | |
9729 | } | |
9730 | ||
9731 | if (diff & NETIF_F_HW_VLAN_STAG_FILTER) { | |
9732 | if (features & NETIF_F_HW_VLAN_STAG_FILTER) { | |
9733 | dev->features = features; | |
9734 | err |= vlan_get_rx_stag_filter_info(dev); | |
9735 | } else { | |
9736 | vlan_drop_rx_stag_filter_info(dev); | |
9737 | } | |
9738 | } | |
9739 | ||
6cb6a27c | 9740 | dev->features = features; |
ae847f40 | 9741 | } |
6cb6a27c | 9742 | |
e7868a85 | 9743 | return err < 0 ? 0 : 1; |
6cb6a27c MM |
9744 | } |
9745 | ||
afe12cc8 MM |
9746 | /** |
9747 | * netdev_update_features - recalculate device features | |
9748 | * @dev: the device to check | |
9749 | * | |
9750 | * Recalculate dev->features set and send notifications if it | |
9751 | * has changed. Should be called after driver or hardware dependent | |
9752 | * conditions might have changed that influence the features. | |
9753 | */ | |
6cb6a27c MM |
9754 | void netdev_update_features(struct net_device *dev) |
9755 | { | |
9756 | if (__netdev_update_features(dev)) | |
9757 | netdev_features_change(dev); | |
5455c699 MM |
9758 | } |
9759 | EXPORT_SYMBOL(netdev_update_features); | |
9760 | ||
afe12cc8 MM |
9761 | /** |
9762 | * netdev_change_features - recalculate device features | |
9763 | * @dev: the device to check | |
9764 | * | |
9765 | * Recalculate dev->features set and send notifications even | |
9766 | * if they have not changed. Should be called instead of | |
9767 | * netdev_update_features() if also dev->vlan_features might | |
9768 | * have changed to allow the changes to be propagated to stacked | |
9769 | * VLAN devices. | |
9770 | */ | |
9771 | void netdev_change_features(struct net_device *dev) | |
9772 | { | |
9773 | __netdev_update_features(dev); | |
9774 | netdev_features_change(dev); | |
9775 | } | |
9776 | EXPORT_SYMBOL(netdev_change_features); | |
9777 | ||
fc4a7489 PM |
9778 | /** |
9779 | * netif_stacked_transfer_operstate - transfer operstate | |
9780 | * @rootdev: the root or lower level device to transfer state from | |
9781 | * @dev: the device to transfer operstate to | |
9782 | * | |
9783 | * Transfer operational state from root to device. This is normally | |
9784 | * called when a stacking relationship exists between the root | |
9785 | * device and the device(a leaf device). | |
9786 | */ | |
9787 | void netif_stacked_transfer_operstate(const struct net_device *rootdev, | |
9788 | struct net_device *dev) | |
9789 | { | |
9790 | if (rootdev->operstate == IF_OPER_DORMANT) | |
9791 | netif_dormant_on(dev); | |
9792 | else | |
9793 | netif_dormant_off(dev); | |
9794 | ||
eec517cd AL |
9795 | if (rootdev->operstate == IF_OPER_TESTING) |
9796 | netif_testing_on(dev); | |
9797 | else | |
9798 | netif_testing_off(dev); | |
9799 | ||
0575c86b ZS |
9800 | if (netif_carrier_ok(rootdev)) |
9801 | netif_carrier_on(dev); | |
9802 | else | |
9803 | netif_carrier_off(dev); | |
fc4a7489 PM |
9804 | } |
9805 | EXPORT_SYMBOL(netif_stacked_transfer_operstate); | |
9806 | ||
1b4bf461 ED |
9807 | static int netif_alloc_rx_queues(struct net_device *dev) |
9808 | { | |
1b4bf461 | 9809 | unsigned int i, count = dev->num_rx_queues; |
bd25fa7b | 9810 | struct netdev_rx_queue *rx; |
10595902 | 9811 | size_t sz = count * sizeof(*rx); |
e817f856 | 9812 | int err = 0; |
1b4bf461 | 9813 | |
bd25fa7b | 9814 | BUG_ON(count < 1); |
1b4bf461 | 9815 | |
dcda9b04 | 9816 | rx = kvzalloc(sz, GFP_KERNEL | __GFP_RETRY_MAYFAIL); |
da6bc57a MH |
9817 | if (!rx) |
9818 | return -ENOMEM; | |
9819 | ||
bd25fa7b TH |
9820 | dev->_rx = rx; |
9821 | ||
e817f856 | 9822 | for (i = 0; i < count; i++) { |
fe822240 | 9823 | rx[i].dev = dev; |
e817f856 JDB |
9824 | |
9825 | /* XDP RX-queue setup */ | |
b02e5a0e | 9826 | err = xdp_rxq_info_reg(&rx[i].xdp_rxq, dev, i, 0); |
e817f856 JDB |
9827 | if (err < 0) |
9828 | goto err_rxq_info; | |
9829 | } | |
1b4bf461 | 9830 | return 0; |
e817f856 JDB |
9831 | |
9832 | err_rxq_info: | |
9833 | /* Rollback successful reg's and free other resources */ | |
9834 | while (i--) | |
9835 | xdp_rxq_info_unreg(&rx[i].xdp_rxq); | |
141b52a9 | 9836 | kvfree(dev->_rx); |
e817f856 JDB |
9837 | dev->_rx = NULL; |
9838 | return err; | |
9839 | } | |
9840 | ||
9841 | static void netif_free_rx_queues(struct net_device *dev) | |
9842 | { | |
9843 | unsigned int i, count = dev->num_rx_queues; | |
e817f856 JDB |
9844 | |
9845 | /* netif_alloc_rx_queues alloc failed, resources have been unreg'ed */ | |
9846 | if (!dev->_rx) | |
9847 | return; | |
9848 | ||
e817f856 | 9849 | for (i = 0; i < count; i++) |
82aaff2f JK |
9850 | xdp_rxq_info_unreg(&dev->_rx[i].xdp_rxq); |
9851 | ||
9852 | kvfree(dev->_rx); | |
1b4bf461 ED |
9853 | } |
9854 | ||
aa942104 CG |
9855 | static void netdev_init_one_queue(struct net_device *dev, |
9856 | struct netdev_queue *queue, void *_unused) | |
9857 | { | |
9858 | /* Initialize queue lock */ | |
9859 | spin_lock_init(&queue->_xmit_lock); | |
1a33e10e | 9860 | netdev_set_xmit_lockdep_class(&queue->_xmit_lock, dev->type); |
aa942104 | 9861 | queue->xmit_lock_owner = -1; |
b236da69 | 9862 | netdev_queue_numa_node_write(queue, NUMA_NO_NODE); |
aa942104 | 9863 | queue->dev = dev; |
114cf580 TH |
9864 | #ifdef CONFIG_BQL |
9865 | dql_init(&queue->dql, HZ); | |
9866 | #endif | |
aa942104 CG |
9867 | } |
9868 | ||
60877a32 ED |
9869 | static void netif_free_tx_queues(struct net_device *dev) |
9870 | { | |
4cb28970 | 9871 | kvfree(dev->_tx); |
60877a32 ED |
9872 | } |
9873 | ||
e6484930 TH |
9874 | static int netif_alloc_netdev_queues(struct net_device *dev) |
9875 | { | |
9876 | unsigned int count = dev->num_tx_queues; | |
9877 | struct netdev_queue *tx; | |
60877a32 | 9878 | size_t sz = count * sizeof(*tx); |
e6484930 | 9879 | |
d339727c ED |
9880 | if (count < 1 || count > 0xffff) |
9881 | return -EINVAL; | |
62b5942a | 9882 | |
dcda9b04 | 9883 | tx = kvzalloc(sz, GFP_KERNEL | __GFP_RETRY_MAYFAIL); |
da6bc57a MH |
9884 | if (!tx) |
9885 | return -ENOMEM; | |
9886 | ||
e6484930 | 9887 | dev->_tx = tx; |
1d24eb48 | 9888 | |
e6484930 TH |
9889 | netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL); |
9890 | spin_lock_init(&dev->tx_global_lock); | |
aa942104 CG |
9891 | |
9892 | return 0; | |
e6484930 TH |
9893 | } |
9894 | ||
a2029240 DV |
9895 | void netif_tx_stop_all_queues(struct net_device *dev) |
9896 | { | |
9897 | unsigned int i; | |
9898 | ||
9899 | for (i = 0; i < dev->num_tx_queues; i++) { | |
9900 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
f4563a75 | 9901 | |
a2029240 DV |
9902 | netif_tx_stop_queue(txq); |
9903 | } | |
9904 | } | |
9905 | EXPORT_SYMBOL(netif_tx_stop_all_queues); | |
9906 | ||
1da177e4 LT |
9907 | /** |
9908 | * register_netdevice - register a network device | |
9909 | * @dev: device to register | |
9910 | * | |
9911 | * Take a completed network device structure and add it to the kernel | |
9912 | * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier | |
9913 | * chain. 0 is returned on success. A negative errno code is returned | |
9914 | * on a failure to set up the device, or if the name is a duplicate. | |
9915 | * | |
9916 | * Callers must hold the rtnl semaphore. You may want | |
9917 | * register_netdev() instead of this. | |
9918 | * | |
9919 | * BUGS: | |
9920 | * The locking appears insufficient to guarantee two parallel registers | |
9921 | * will not get the same name. | |
9922 | */ | |
9923 | ||
9924 | int register_netdevice(struct net_device *dev) | |
9925 | { | |
1da177e4 | 9926 | int ret; |
d314774c | 9927 | struct net *net = dev_net(dev); |
1da177e4 | 9928 | |
e283de3a FF |
9929 | BUILD_BUG_ON(sizeof(netdev_features_t) * BITS_PER_BYTE < |
9930 | NETDEV_FEATURE_COUNT); | |
1da177e4 LT |
9931 | BUG_ON(dev_boot_phase); |
9932 | ASSERT_RTNL(); | |
9933 | ||
b17a7c17 SH |
9934 | might_sleep(); |
9935 | ||
1da177e4 LT |
9936 | /* When net_device's are persistent, this will be fatal. */ |
9937 | BUG_ON(dev->reg_state != NETREG_UNINITIALIZED); | |
d314774c | 9938 | BUG_ON(!net); |
1da177e4 | 9939 | |
9000edb7 JK |
9940 | ret = ethtool_check_ops(dev->ethtool_ops); |
9941 | if (ret) | |
9942 | return ret; | |
9943 | ||
f1f28aa3 | 9944 | spin_lock_init(&dev->addr_list_lock); |
845e0ebb | 9945 | netdev_set_addr_lockdep_class(dev); |
1da177e4 | 9946 | |
828de4f6 | 9947 | ret = dev_get_valid_name(net, dev, dev->name); |
0696c3a8 PP |
9948 | if (ret < 0) |
9949 | goto out; | |
9950 | ||
9077f052 | 9951 | ret = -ENOMEM; |
ff927412 JP |
9952 | dev->name_node = netdev_name_node_head_alloc(dev); |
9953 | if (!dev->name_node) | |
9954 | goto out; | |
9955 | ||
1da177e4 | 9956 | /* Init, if this function is available */ |
d314774c SH |
9957 | if (dev->netdev_ops->ndo_init) { |
9958 | ret = dev->netdev_ops->ndo_init(dev); | |
1da177e4 LT |
9959 | if (ret) { |
9960 | if (ret > 0) | |
9961 | ret = -EIO; | |
42c17fa6 | 9962 | goto err_free_name; |
1da177e4 LT |
9963 | } |
9964 | } | |
4ec93edb | 9965 | |
f646968f PM |
9966 | if (((dev->hw_features | dev->features) & |
9967 | NETIF_F_HW_VLAN_CTAG_FILTER) && | |
d2ed273d MM |
9968 | (!dev->netdev_ops->ndo_vlan_rx_add_vid || |
9969 | !dev->netdev_ops->ndo_vlan_rx_kill_vid)) { | |
9970 | netdev_WARN(dev, "Buggy VLAN acceleration in driver!\n"); | |
9971 | ret = -EINVAL; | |
9972 | goto err_uninit; | |
9973 | } | |
9974 | ||
9c7dafbf PE |
9975 | ret = -EBUSY; |
9976 | if (!dev->ifindex) | |
9977 | dev->ifindex = dev_new_index(net); | |
9978 | else if (__dev_get_by_index(net, dev->ifindex)) | |
9979 | goto err_uninit; | |
9980 | ||
5455c699 MM |
9981 | /* Transfer changeable features to wanted_features and enable |
9982 | * software offloads (GSO and GRO). | |
9983 | */ | |
1a3c998f | 9984 | dev->hw_features |= (NETIF_F_SOFT_FEATURES | NETIF_F_SOFT_FEATURES_OFF); |
14d1232f | 9985 | dev->features |= NETIF_F_SOFT_FEATURES; |
d764a122 SD |
9986 | |
9987 | if (dev->netdev_ops->ndo_udp_tunnel_add) { | |
9988 | dev->features |= NETIF_F_RX_UDP_TUNNEL_PORT; | |
9989 | dev->hw_features |= NETIF_F_RX_UDP_TUNNEL_PORT; | |
9990 | } | |
9991 | ||
14d1232f | 9992 | dev->wanted_features = dev->features & dev->hw_features; |
1da177e4 | 9993 | |
cbc53e08 | 9994 | if (!(dev->flags & IFF_LOOPBACK)) |
34324dc2 | 9995 | dev->hw_features |= NETIF_F_NOCACHE_COPY; |
cbc53e08 | 9996 | |
7f348a60 AD |
9997 | /* If IPv4 TCP segmentation offload is supported we should also |
9998 | * allow the device to enable segmenting the frame with the option | |
9999 | * of ignoring a static IP ID value. This doesn't enable the | |
10000 | * feature itself but allows the user to enable it later. | |
10001 | */ | |
cbc53e08 AD |
10002 | if (dev->hw_features & NETIF_F_TSO) |
10003 | dev->hw_features |= NETIF_F_TSO_MANGLEID; | |
7f348a60 AD |
10004 | if (dev->vlan_features & NETIF_F_TSO) |
10005 | dev->vlan_features |= NETIF_F_TSO_MANGLEID; | |
10006 | if (dev->mpls_features & NETIF_F_TSO) | |
10007 | dev->mpls_features |= NETIF_F_TSO_MANGLEID; | |
10008 | if (dev->hw_enc_features & NETIF_F_TSO) | |
10009 | dev->hw_enc_features |= NETIF_F_TSO_MANGLEID; | |
c6e1a0d1 | 10010 | |
1180e7d6 | 10011 | /* Make NETIF_F_HIGHDMA inheritable to VLAN devices. |
16c3ea78 | 10012 | */ |
1180e7d6 | 10013 | dev->vlan_features |= NETIF_F_HIGHDMA; |
16c3ea78 | 10014 | |
ee579677 PS |
10015 | /* Make NETIF_F_SG inheritable to tunnel devices. |
10016 | */ | |
802ab55a | 10017 | dev->hw_enc_features |= NETIF_F_SG | NETIF_F_GSO_PARTIAL; |
ee579677 | 10018 | |
0d89d203 SH |
10019 | /* Make NETIF_F_SG inheritable to MPLS. |
10020 | */ | |
10021 | dev->mpls_features |= NETIF_F_SG; | |
10022 | ||
7ffbe3fd JB |
10023 | ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev); |
10024 | ret = notifier_to_errno(ret); | |
10025 | if (ret) | |
10026 | goto err_uninit; | |
10027 | ||
8b41d188 | 10028 | ret = netdev_register_kobject(dev); |
cb626bf5 JH |
10029 | if (ret) { |
10030 | dev->reg_state = NETREG_UNREGISTERED; | |
7ce1b0ed | 10031 | goto err_uninit; |
cb626bf5 | 10032 | } |
b17a7c17 SH |
10033 | dev->reg_state = NETREG_REGISTERED; |
10034 | ||
6cb6a27c | 10035 | __netdev_update_features(dev); |
8e9b59b2 | 10036 | |
1da177e4 LT |
10037 | /* |
10038 | * Default initial state at registry is that the | |
10039 | * device is present. | |
10040 | */ | |
10041 | ||
10042 | set_bit(__LINK_STATE_PRESENT, &dev->state); | |
10043 | ||
8f4cccbb BH |
10044 | linkwatch_init_dev(dev); |
10045 | ||
1da177e4 | 10046 | dev_init_scheduler(dev); |
1da177e4 | 10047 | dev_hold(dev); |
ce286d32 | 10048 | list_netdevice(dev); |
7bf23575 | 10049 | add_device_randomness(dev->dev_addr, dev->addr_len); |
1da177e4 | 10050 | |
948b337e JP |
10051 | /* If the device has permanent device address, driver should |
10052 | * set dev_addr and also addr_assign_type should be set to | |
10053 | * NET_ADDR_PERM (default value). | |
10054 | */ | |
10055 | if (dev->addr_assign_type == NET_ADDR_PERM) | |
10056 | memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len); | |
10057 | ||
1da177e4 | 10058 | /* Notify protocols, that a new device appeared. */ |
056925ab | 10059 | ret = call_netdevice_notifiers(NETDEV_REGISTER, dev); |
fcc5a03a | 10060 | ret = notifier_to_errno(ret); |
93ee31f1 DL |
10061 | if (ret) { |
10062 | rollback_registered(dev); | |
10cc514f SAK |
10063 | rcu_barrier(); |
10064 | ||
93ee31f1 | 10065 | dev->reg_state = NETREG_UNREGISTERED; |
814152a8 YY |
10066 | /* We should put the kobject that hold in |
10067 | * netdev_unregister_kobject(), otherwise | |
10068 | * the net device cannot be freed when | |
10069 | * driver calls free_netdev(), because the | |
10070 | * kobject is being hold. | |
10071 | */ | |
10072 | kobject_put(&dev->dev.kobj); | |
93ee31f1 | 10073 | } |
d90a909e EB |
10074 | /* |
10075 | * Prevent userspace races by waiting until the network | |
10076 | * device is fully setup before sending notifications. | |
10077 | */ | |
a2835763 PM |
10078 | if (!dev->rtnl_link_ops || |
10079 | dev->rtnl_link_state == RTNL_LINK_INITIALIZED) | |
7f294054 | 10080 | rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL); |
1da177e4 LT |
10081 | |
10082 | out: | |
10083 | return ret; | |
7ce1b0ed HX |
10084 | |
10085 | err_uninit: | |
d314774c SH |
10086 | if (dev->netdev_ops->ndo_uninit) |
10087 | dev->netdev_ops->ndo_uninit(dev); | |
cf124db5 DM |
10088 | if (dev->priv_destructor) |
10089 | dev->priv_destructor(dev); | |
42c17fa6 DC |
10090 | err_free_name: |
10091 | netdev_name_node_free(dev->name_node); | |
7ce1b0ed | 10092 | goto out; |
1da177e4 | 10093 | } |
d1b19dff | 10094 | EXPORT_SYMBOL(register_netdevice); |
1da177e4 | 10095 | |
937f1ba5 BH |
10096 | /** |
10097 | * init_dummy_netdev - init a dummy network device for NAPI | |
10098 | * @dev: device to init | |
10099 | * | |
10100 | * This takes a network device structure and initialize the minimum | |
10101 | * amount of fields so it can be used to schedule NAPI polls without | |
10102 | * registering a full blown interface. This is to be used by drivers | |
10103 | * that need to tie several hardware interfaces to a single NAPI | |
10104 | * poll scheduler due to HW limitations. | |
10105 | */ | |
10106 | int init_dummy_netdev(struct net_device *dev) | |
10107 | { | |
10108 | /* Clear everything. Note we don't initialize spinlocks | |
10109 | * are they aren't supposed to be taken by any of the | |
10110 | * NAPI code and this dummy netdev is supposed to be | |
10111 | * only ever used for NAPI polls | |
10112 | */ | |
10113 | memset(dev, 0, sizeof(struct net_device)); | |
10114 | ||
10115 | /* make sure we BUG if trying to hit standard | |
10116 | * register/unregister code path | |
10117 | */ | |
10118 | dev->reg_state = NETREG_DUMMY; | |
10119 | ||
937f1ba5 BH |
10120 | /* NAPI wants this */ |
10121 | INIT_LIST_HEAD(&dev->napi_list); | |
10122 | ||
10123 | /* a dummy interface is started by default */ | |
10124 | set_bit(__LINK_STATE_PRESENT, &dev->state); | |
10125 | set_bit(__LINK_STATE_START, &dev->state); | |
10126 | ||
35edfdc7 JE |
10127 | /* napi_busy_loop stats accounting wants this */ |
10128 | dev_net_set(dev, &init_net); | |
10129 | ||
29b4433d ED |
10130 | /* Note : We dont allocate pcpu_refcnt for dummy devices, |
10131 | * because users of this 'device' dont need to change | |
10132 | * its refcount. | |
10133 | */ | |
10134 | ||
937f1ba5 BH |
10135 | return 0; |
10136 | } | |
10137 | EXPORT_SYMBOL_GPL(init_dummy_netdev); | |
10138 | ||
10139 | ||
1da177e4 LT |
10140 | /** |
10141 | * register_netdev - register a network device | |
10142 | * @dev: device to register | |
10143 | * | |
10144 | * Take a completed network device structure and add it to the kernel | |
10145 | * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier | |
10146 | * chain. 0 is returned on success. A negative errno code is returned | |
10147 | * on a failure to set up the device, or if the name is a duplicate. | |
10148 | * | |
38b4da38 | 10149 | * This is a wrapper around register_netdevice that takes the rtnl semaphore |
1da177e4 LT |
10150 | * and expands the device name if you passed a format string to |
10151 | * alloc_netdev. | |
10152 | */ | |
10153 | int register_netdev(struct net_device *dev) | |
10154 | { | |
10155 | int err; | |
10156 | ||
b0f3debc KT |
10157 | if (rtnl_lock_killable()) |
10158 | return -EINTR; | |
1da177e4 | 10159 | err = register_netdevice(dev); |
1da177e4 LT |
10160 | rtnl_unlock(); |
10161 | return err; | |
10162 | } | |
10163 | EXPORT_SYMBOL(register_netdev); | |
10164 | ||
29b4433d ED |
10165 | int netdev_refcnt_read(const struct net_device *dev) |
10166 | { | |
10167 | int i, refcnt = 0; | |
10168 | ||
10169 | for_each_possible_cpu(i) | |
10170 | refcnt += *per_cpu_ptr(dev->pcpu_refcnt, i); | |
10171 | return refcnt; | |
10172 | } | |
10173 | EXPORT_SYMBOL(netdev_refcnt_read); | |
10174 | ||
de2b541b MCC |
10175 | #define WAIT_REFS_MIN_MSECS 1 |
10176 | #define WAIT_REFS_MAX_MSECS 250 | |
2c53040f | 10177 | /** |
1da177e4 | 10178 | * netdev_wait_allrefs - wait until all references are gone. |
3de7a37b | 10179 | * @dev: target net_device |
1da177e4 LT |
10180 | * |
10181 | * This is called when unregistering network devices. | |
10182 | * | |
10183 | * Any protocol or device that holds a reference should register | |
10184 | * for netdevice notification, and cleanup and put back the | |
10185 | * reference if they receive an UNREGISTER event. | |
10186 | * We can get stuck here if buggy protocols don't correctly | |
4ec93edb | 10187 | * call dev_put. |
1da177e4 LT |
10188 | */ |
10189 | static void netdev_wait_allrefs(struct net_device *dev) | |
10190 | { | |
10191 | unsigned long rebroadcast_time, warning_time; | |
0e4be9e5 | 10192 | int wait = 0, refcnt; |
1da177e4 | 10193 | |
e014debe ED |
10194 | linkwatch_forget_dev(dev); |
10195 | ||
1da177e4 | 10196 | rebroadcast_time = warning_time = jiffies; |
29b4433d ED |
10197 | refcnt = netdev_refcnt_read(dev); |
10198 | ||
10199 | while (refcnt != 0) { | |
1da177e4 | 10200 | if (time_after(jiffies, rebroadcast_time + 1 * HZ)) { |
6756ae4b | 10201 | rtnl_lock(); |
1da177e4 LT |
10202 | |
10203 | /* Rebroadcast unregister notification */ | |
056925ab | 10204 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); |
1da177e4 | 10205 | |
748e2d93 | 10206 | __rtnl_unlock(); |
0115e8e3 | 10207 | rcu_barrier(); |
748e2d93 ED |
10208 | rtnl_lock(); |
10209 | ||
1da177e4 LT |
10210 | if (test_bit(__LINK_STATE_LINKWATCH_PENDING, |
10211 | &dev->state)) { | |
10212 | /* We must not have linkwatch events | |
10213 | * pending on unregister. If this | |
10214 | * happens, we simply run the queue | |
10215 | * unscheduled, resulting in a noop | |
10216 | * for this device. | |
10217 | */ | |
10218 | linkwatch_run_queue(); | |
10219 | } | |
10220 | ||
6756ae4b | 10221 | __rtnl_unlock(); |
1da177e4 LT |
10222 | |
10223 | rebroadcast_time = jiffies; | |
10224 | } | |
10225 | ||
0e4be9e5 FR |
10226 | if (!wait) { |
10227 | rcu_barrier(); | |
10228 | wait = WAIT_REFS_MIN_MSECS; | |
10229 | } else { | |
10230 | msleep(wait); | |
10231 | wait = min(wait << 1, WAIT_REFS_MAX_MSECS); | |
10232 | } | |
1da177e4 | 10233 | |
29b4433d ED |
10234 | refcnt = netdev_refcnt_read(dev); |
10235 | ||
d7c04b05 | 10236 | if (refcnt && time_after(jiffies, warning_time + 10 * HZ)) { |
7b6cd1ce JP |
10237 | pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n", |
10238 | dev->name, refcnt); | |
1da177e4 LT |
10239 | warning_time = jiffies; |
10240 | } | |
10241 | } | |
10242 | } | |
10243 | ||
10244 | /* The sequence is: | |
10245 | * | |
10246 | * rtnl_lock(); | |
10247 | * ... | |
10248 | * register_netdevice(x1); | |
10249 | * register_netdevice(x2); | |
10250 | * ... | |
10251 | * unregister_netdevice(y1); | |
10252 | * unregister_netdevice(y2); | |
10253 | * ... | |
10254 | * rtnl_unlock(); | |
10255 | * free_netdev(y1); | |
10256 | * free_netdev(y2); | |
10257 | * | |
58ec3b4d | 10258 | * We are invoked by rtnl_unlock(). |
1da177e4 | 10259 | * This allows us to deal with problems: |
b17a7c17 | 10260 | * 1) We can delete sysfs objects which invoke hotplug |
1da177e4 LT |
10261 | * without deadlocking with linkwatch via keventd. |
10262 | * 2) Since we run with the RTNL semaphore not held, we can sleep | |
10263 | * safely in order to wait for the netdev refcnt to drop to zero. | |
58ec3b4d HX |
10264 | * |
10265 | * We must not return until all unregister events added during | |
10266 | * the interval the lock was held have been completed. | |
1da177e4 | 10267 | */ |
1da177e4 LT |
10268 | void netdev_run_todo(void) |
10269 | { | |
626ab0e6 | 10270 | struct list_head list; |
1fc70edb TY |
10271 | #ifdef CONFIG_LOCKDEP |
10272 | struct list_head unlink_list; | |
10273 | ||
10274 | list_replace_init(&net_unlink_list, &unlink_list); | |
10275 | ||
10276 | while (!list_empty(&unlink_list)) { | |
10277 | struct net_device *dev = list_first_entry(&unlink_list, | |
10278 | struct net_device, | |
10279 | unlink_list); | |
0e8b8d6a | 10280 | list_del_init(&dev->unlink_list); |
1fc70edb TY |
10281 | dev->nested_level = dev->lower_level - 1; |
10282 | } | |
10283 | #endif | |
1da177e4 | 10284 | |
1da177e4 | 10285 | /* Snapshot list, allow later requests */ |
626ab0e6 | 10286 | list_replace_init(&net_todo_list, &list); |
58ec3b4d HX |
10287 | |
10288 | __rtnl_unlock(); | |
626ab0e6 | 10289 | |
0115e8e3 ED |
10290 | |
10291 | /* Wait for rcu callbacks to finish before next phase */ | |
850a545b EB |
10292 | if (!list_empty(&list)) |
10293 | rcu_barrier(); | |
10294 | ||
1da177e4 LT |
10295 | while (!list_empty(&list)) { |
10296 | struct net_device *dev | |
e5e26d75 | 10297 | = list_first_entry(&list, struct net_device, todo_list); |
1da177e4 LT |
10298 | list_del(&dev->todo_list); |
10299 | ||
b17a7c17 | 10300 | if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) { |
7b6cd1ce | 10301 | pr_err("network todo '%s' but state %d\n", |
b17a7c17 SH |
10302 | dev->name, dev->reg_state); |
10303 | dump_stack(); | |
10304 | continue; | |
10305 | } | |
1da177e4 | 10306 | |
b17a7c17 | 10307 | dev->reg_state = NETREG_UNREGISTERED; |
1da177e4 | 10308 | |
b17a7c17 | 10309 | netdev_wait_allrefs(dev); |
1da177e4 | 10310 | |
b17a7c17 | 10311 | /* paranoia */ |
29b4433d | 10312 | BUG_ON(netdev_refcnt_read(dev)); |
7866a621 SN |
10313 | BUG_ON(!list_empty(&dev->ptype_all)); |
10314 | BUG_ON(!list_empty(&dev->ptype_specific)); | |
33d480ce ED |
10315 | WARN_ON(rcu_access_pointer(dev->ip_ptr)); |
10316 | WARN_ON(rcu_access_pointer(dev->ip6_ptr)); | |
330c7272 | 10317 | #if IS_ENABLED(CONFIG_DECNET) |
547b792c | 10318 | WARN_ON(dev->dn_ptr); |
330c7272 | 10319 | #endif |
cf124db5 DM |
10320 | if (dev->priv_destructor) |
10321 | dev->priv_destructor(dev); | |
10322 | if (dev->needs_free_netdev) | |
10323 | free_netdev(dev); | |
9093bbb2 | 10324 | |
50624c93 EB |
10325 | /* Report a network device has been unregistered */ |
10326 | rtnl_lock(); | |
10327 | dev_net(dev)->dev_unreg_count--; | |
10328 | __rtnl_unlock(); | |
10329 | wake_up(&netdev_unregistering_wq); | |
10330 | ||
9093bbb2 SH |
10331 | /* Free network device */ |
10332 | kobject_put(&dev->dev.kobj); | |
1da177e4 | 10333 | } |
1da177e4 LT |
10334 | } |
10335 | ||
9256645a JW |
10336 | /* Convert net_device_stats to rtnl_link_stats64. rtnl_link_stats64 has |
10337 | * all the same fields in the same order as net_device_stats, with only | |
10338 | * the type differing, but rtnl_link_stats64 may have additional fields | |
10339 | * at the end for newer counters. | |
3cfde79c | 10340 | */ |
77a1abf5 ED |
10341 | void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64, |
10342 | const struct net_device_stats *netdev_stats) | |
3cfde79c BH |
10343 | { |
10344 | #if BITS_PER_LONG == 64 | |
9256645a | 10345 | BUILD_BUG_ON(sizeof(*stats64) < sizeof(*netdev_stats)); |
9af9959e | 10346 | memcpy(stats64, netdev_stats, sizeof(*netdev_stats)); |
9256645a JW |
10347 | /* zero out counters that only exist in rtnl_link_stats64 */ |
10348 | memset((char *)stats64 + sizeof(*netdev_stats), 0, | |
10349 | sizeof(*stats64) - sizeof(*netdev_stats)); | |
3cfde79c | 10350 | #else |
9256645a | 10351 | size_t i, n = sizeof(*netdev_stats) / sizeof(unsigned long); |
3cfde79c BH |
10352 | const unsigned long *src = (const unsigned long *)netdev_stats; |
10353 | u64 *dst = (u64 *)stats64; | |
10354 | ||
9256645a | 10355 | BUILD_BUG_ON(n > sizeof(*stats64) / sizeof(u64)); |
3cfde79c BH |
10356 | for (i = 0; i < n; i++) |
10357 | dst[i] = src[i]; | |
9256645a JW |
10358 | /* zero out counters that only exist in rtnl_link_stats64 */ |
10359 | memset((char *)stats64 + n * sizeof(u64), 0, | |
10360 | sizeof(*stats64) - n * sizeof(u64)); | |
3cfde79c BH |
10361 | #endif |
10362 | } | |
77a1abf5 | 10363 | EXPORT_SYMBOL(netdev_stats_to_stats64); |
3cfde79c | 10364 | |
eeda3fd6 SH |
10365 | /** |
10366 | * dev_get_stats - get network device statistics | |
10367 | * @dev: device to get statistics from | |
28172739 | 10368 | * @storage: place to store stats |
eeda3fd6 | 10369 | * |
d7753516 BH |
10370 | * Get network statistics from device. Return @storage. |
10371 | * The device driver may provide its own method by setting | |
10372 | * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats; | |
10373 | * otherwise the internal statistics structure is used. | |
eeda3fd6 | 10374 | */ |
d7753516 BH |
10375 | struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev, |
10376 | struct rtnl_link_stats64 *storage) | |
7004bf25 | 10377 | { |
eeda3fd6 SH |
10378 | const struct net_device_ops *ops = dev->netdev_ops; |
10379 | ||
28172739 ED |
10380 | if (ops->ndo_get_stats64) { |
10381 | memset(storage, 0, sizeof(*storage)); | |
caf586e5 ED |
10382 | ops->ndo_get_stats64(dev, storage); |
10383 | } else if (ops->ndo_get_stats) { | |
3cfde79c | 10384 | netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev)); |
caf586e5 ED |
10385 | } else { |
10386 | netdev_stats_to_stats64(storage, &dev->stats); | |
28172739 | 10387 | } |
6f64ec74 ED |
10388 | storage->rx_dropped += (unsigned long)atomic_long_read(&dev->rx_dropped); |
10389 | storage->tx_dropped += (unsigned long)atomic_long_read(&dev->tx_dropped); | |
10390 | storage->rx_nohandler += (unsigned long)atomic_long_read(&dev->rx_nohandler); | |
28172739 | 10391 | return storage; |
c45d286e | 10392 | } |
eeda3fd6 | 10393 | EXPORT_SYMBOL(dev_get_stats); |
c45d286e | 10394 | |
44fa32f0 HK |
10395 | /** |
10396 | * dev_fetch_sw_netstats - get per-cpu network device statistics | |
10397 | * @s: place to store stats | |
10398 | * @netstats: per-cpu network stats to read from | |
10399 | * | |
10400 | * Read per-cpu network statistics and populate the related fields in @s. | |
10401 | */ | |
10402 | void dev_fetch_sw_netstats(struct rtnl_link_stats64 *s, | |
10403 | const struct pcpu_sw_netstats __percpu *netstats) | |
10404 | { | |
10405 | int cpu; | |
10406 | ||
10407 | for_each_possible_cpu(cpu) { | |
10408 | const struct pcpu_sw_netstats *stats; | |
10409 | struct pcpu_sw_netstats tmp; | |
10410 | unsigned int start; | |
10411 | ||
10412 | stats = per_cpu_ptr(netstats, cpu); | |
10413 | do { | |
10414 | start = u64_stats_fetch_begin_irq(&stats->syncp); | |
10415 | tmp.rx_packets = stats->rx_packets; | |
10416 | tmp.rx_bytes = stats->rx_bytes; | |
10417 | tmp.tx_packets = stats->tx_packets; | |
10418 | tmp.tx_bytes = stats->tx_bytes; | |
10419 | } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); | |
10420 | ||
10421 | s->rx_packets += tmp.rx_packets; | |
10422 | s->rx_bytes += tmp.rx_bytes; | |
10423 | s->tx_packets += tmp.tx_packets; | |
10424 | s->tx_bytes += tmp.tx_bytes; | |
10425 | } | |
10426 | } | |
10427 | EXPORT_SYMBOL_GPL(dev_fetch_sw_netstats); | |
10428 | ||
a1839426 HK |
10429 | /** |
10430 | * dev_get_tstats64 - ndo_get_stats64 implementation | |
10431 | * @dev: device to get statistics from | |
10432 | * @s: place to store stats | |
10433 | * | |
10434 | * Populate @s from dev->stats and dev->tstats. Can be used as | |
10435 | * ndo_get_stats64() callback. | |
10436 | */ | |
10437 | void dev_get_tstats64(struct net_device *dev, struct rtnl_link_stats64 *s) | |
10438 | { | |
10439 | netdev_stats_to_stats64(s, &dev->stats); | |
10440 | dev_fetch_sw_netstats(s, dev->tstats); | |
10441 | } | |
10442 | EXPORT_SYMBOL_GPL(dev_get_tstats64); | |
10443 | ||
24824a09 | 10444 | struct netdev_queue *dev_ingress_queue_create(struct net_device *dev) |
dc2b4847 | 10445 | { |
24824a09 | 10446 | struct netdev_queue *queue = dev_ingress_queue(dev); |
dc2b4847 | 10447 | |
24824a09 ED |
10448 | #ifdef CONFIG_NET_CLS_ACT |
10449 | if (queue) | |
10450 | return queue; | |
10451 | queue = kzalloc(sizeof(*queue), GFP_KERNEL); | |
10452 | if (!queue) | |
10453 | return NULL; | |
10454 | netdev_init_one_queue(dev, queue, NULL); | |
2ce1ee17 | 10455 | RCU_INIT_POINTER(queue->qdisc, &noop_qdisc); |
24824a09 ED |
10456 | queue->qdisc_sleeping = &noop_qdisc; |
10457 | rcu_assign_pointer(dev->ingress_queue, queue); | |
10458 | #endif | |
10459 | return queue; | |
bb949fbd DM |
10460 | } |
10461 | ||
2c60db03 ED |
10462 | static const struct ethtool_ops default_ethtool_ops; |
10463 | ||
d07d7507 SG |
10464 | void netdev_set_default_ethtool_ops(struct net_device *dev, |
10465 | const struct ethtool_ops *ops) | |
10466 | { | |
10467 | if (dev->ethtool_ops == &default_ethtool_ops) | |
10468 | dev->ethtool_ops = ops; | |
10469 | } | |
10470 | EXPORT_SYMBOL_GPL(netdev_set_default_ethtool_ops); | |
10471 | ||
74d332c1 ED |
10472 | void netdev_freemem(struct net_device *dev) |
10473 | { | |
10474 | char *addr = (char *)dev - dev->padded; | |
10475 | ||
4cb28970 | 10476 | kvfree(addr); |
74d332c1 ED |
10477 | } |
10478 | ||
1da177e4 | 10479 | /** |
722c9a0c | 10480 | * alloc_netdev_mqs - allocate network device |
10481 | * @sizeof_priv: size of private data to allocate space for | |
10482 | * @name: device name format string | |
10483 | * @name_assign_type: origin of device name | |
10484 | * @setup: callback to initialize device | |
10485 | * @txqs: the number of TX subqueues to allocate | |
10486 | * @rxqs: the number of RX subqueues to allocate | |
10487 | * | |
10488 | * Allocates a struct net_device with private data area for driver use | |
10489 | * and performs basic initialization. Also allocates subqueue structs | |
10490 | * for each queue on the device. | |
1da177e4 | 10491 | */ |
36909ea4 | 10492 | struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name, |
c835a677 | 10493 | unsigned char name_assign_type, |
36909ea4 TH |
10494 | void (*setup)(struct net_device *), |
10495 | unsigned int txqs, unsigned int rxqs) | |
1da177e4 | 10496 | { |
1da177e4 | 10497 | struct net_device *dev; |
52a59bd5 | 10498 | unsigned int alloc_size; |
1ce8e7b5 | 10499 | struct net_device *p; |
1da177e4 | 10500 | |
b6fe17d6 SH |
10501 | BUG_ON(strlen(name) >= sizeof(dev->name)); |
10502 | ||
36909ea4 | 10503 | if (txqs < 1) { |
7b6cd1ce | 10504 | pr_err("alloc_netdev: Unable to allocate device with zero queues\n"); |
55513fb4 TH |
10505 | return NULL; |
10506 | } | |
10507 | ||
36909ea4 | 10508 | if (rxqs < 1) { |
7b6cd1ce | 10509 | pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n"); |
36909ea4 TH |
10510 | return NULL; |
10511 | } | |
36909ea4 | 10512 | |
fd2ea0a7 | 10513 | alloc_size = sizeof(struct net_device); |
d1643d24 AD |
10514 | if (sizeof_priv) { |
10515 | /* ensure 32-byte alignment of private area */ | |
1ce8e7b5 | 10516 | alloc_size = ALIGN(alloc_size, NETDEV_ALIGN); |
d1643d24 AD |
10517 | alloc_size += sizeof_priv; |
10518 | } | |
10519 | /* ensure 32-byte alignment of whole construct */ | |
1ce8e7b5 | 10520 | alloc_size += NETDEV_ALIGN - 1; |
1da177e4 | 10521 | |
dcda9b04 | 10522 | p = kvzalloc(alloc_size, GFP_KERNEL | __GFP_RETRY_MAYFAIL); |
62b5942a | 10523 | if (!p) |
1da177e4 | 10524 | return NULL; |
1da177e4 | 10525 | |
1ce8e7b5 | 10526 | dev = PTR_ALIGN(p, NETDEV_ALIGN); |
1da177e4 | 10527 | dev->padded = (char *)dev - (char *)p; |
ab9c73cc | 10528 | |
29b4433d ED |
10529 | dev->pcpu_refcnt = alloc_percpu(int); |
10530 | if (!dev->pcpu_refcnt) | |
74d332c1 | 10531 | goto free_dev; |
ab9c73cc | 10532 | |
ab9c73cc | 10533 | if (dev_addr_init(dev)) |
29b4433d | 10534 | goto free_pcpu; |
ab9c73cc | 10535 | |
22bedad3 | 10536 | dev_mc_init(dev); |
a748ee24 | 10537 | dev_uc_init(dev); |
ccffad25 | 10538 | |
c346dca1 | 10539 | dev_net_set(dev, &init_net); |
1da177e4 | 10540 | |
8d3bdbd5 | 10541 | dev->gso_max_size = GSO_MAX_SIZE; |
30b678d8 | 10542 | dev->gso_max_segs = GSO_MAX_SEGS; |
5343da4c TY |
10543 | dev->upper_level = 1; |
10544 | dev->lower_level = 1; | |
1fc70edb TY |
10545 | #ifdef CONFIG_LOCKDEP |
10546 | dev->nested_level = 0; | |
10547 | INIT_LIST_HEAD(&dev->unlink_list); | |
10548 | #endif | |
8d3bdbd5 | 10549 | |
8d3bdbd5 DM |
10550 | INIT_LIST_HEAD(&dev->napi_list); |
10551 | INIT_LIST_HEAD(&dev->unreg_list); | |
5cde2829 | 10552 | INIT_LIST_HEAD(&dev->close_list); |
8d3bdbd5 | 10553 | INIT_LIST_HEAD(&dev->link_watch_list); |
2f268f12 VF |
10554 | INIT_LIST_HEAD(&dev->adj_list.upper); |
10555 | INIT_LIST_HEAD(&dev->adj_list.lower); | |
7866a621 SN |
10556 | INIT_LIST_HEAD(&dev->ptype_all); |
10557 | INIT_LIST_HEAD(&dev->ptype_specific); | |
93642e14 | 10558 | INIT_LIST_HEAD(&dev->net_notifier_list); |
59cc1f61 JK |
10559 | #ifdef CONFIG_NET_SCHED |
10560 | hash_init(dev->qdisc_hash); | |
10561 | #endif | |
02875878 | 10562 | dev->priv_flags = IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM; |
8d3bdbd5 DM |
10563 | setup(dev); |
10564 | ||
a813104d | 10565 | if (!dev->tx_queue_len) { |
f84bb1ea | 10566 | dev->priv_flags |= IFF_NO_QUEUE; |
11597084 | 10567 | dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN; |
a813104d | 10568 | } |
906470c1 | 10569 | |
36909ea4 TH |
10570 | dev->num_tx_queues = txqs; |
10571 | dev->real_num_tx_queues = txqs; | |
ed9af2e8 | 10572 | if (netif_alloc_netdev_queues(dev)) |
8d3bdbd5 | 10573 | goto free_all; |
e8a0464c | 10574 | |
36909ea4 TH |
10575 | dev->num_rx_queues = rxqs; |
10576 | dev->real_num_rx_queues = rxqs; | |
fe822240 | 10577 | if (netif_alloc_rx_queues(dev)) |
8d3bdbd5 | 10578 | goto free_all; |
0a9627f2 | 10579 | |
1da177e4 | 10580 | strcpy(dev->name, name); |
c835a677 | 10581 | dev->name_assign_type = name_assign_type; |
cbda10fa | 10582 | dev->group = INIT_NETDEV_GROUP; |
2c60db03 ED |
10583 | if (!dev->ethtool_ops) |
10584 | dev->ethtool_ops = &default_ethtool_ops; | |
e687ad60 | 10585 | |
357b6cc5 | 10586 | nf_hook_ingress_init(dev); |
e687ad60 | 10587 | |
1da177e4 | 10588 | return dev; |
ab9c73cc | 10589 | |
8d3bdbd5 DM |
10590 | free_all: |
10591 | free_netdev(dev); | |
10592 | return NULL; | |
10593 | ||
29b4433d ED |
10594 | free_pcpu: |
10595 | free_percpu(dev->pcpu_refcnt); | |
74d332c1 ED |
10596 | free_dev: |
10597 | netdev_freemem(dev); | |
ab9c73cc | 10598 | return NULL; |
1da177e4 | 10599 | } |
36909ea4 | 10600 | EXPORT_SYMBOL(alloc_netdev_mqs); |
1da177e4 LT |
10601 | |
10602 | /** | |
722c9a0c | 10603 | * free_netdev - free network device |
10604 | * @dev: device | |
1da177e4 | 10605 | * |
722c9a0c | 10606 | * This function does the last stage of destroying an allocated device |
10607 | * interface. The reference to the device object is released. If this | |
10608 | * is the last reference then it will be freed.Must be called in process | |
10609 | * context. | |
1da177e4 LT |
10610 | */ |
10611 | void free_netdev(struct net_device *dev) | |
10612 | { | |
d565b0a1 HX |
10613 | struct napi_struct *p, *n; |
10614 | ||
93d05d4a | 10615 | might_sleep(); |
60877a32 | 10616 | netif_free_tx_queues(dev); |
e817f856 | 10617 | netif_free_rx_queues(dev); |
e8a0464c | 10618 | |
33d480ce | 10619 | kfree(rcu_dereference_protected(dev->ingress_queue, 1)); |
24824a09 | 10620 | |
f001fde5 JP |
10621 | /* Flush device addresses */ |
10622 | dev_addr_flush(dev); | |
10623 | ||
d565b0a1 HX |
10624 | list_for_each_entry_safe(p, n, &dev->napi_list, dev_list) |
10625 | netif_napi_del(p); | |
10626 | ||
29b4433d ED |
10627 | free_percpu(dev->pcpu_refcnt); |
10628 | dev->pcpu_refcnt = NULL; | |
75ccae62 THJ |
10629 | free_percpu(dev->xdp_bulkq); |
10630 | dev->xdp_bulkq = NULL; | |
29b4433d | 10631 | |
3041a069 | 10632 | /* Compatibility with error handling in drivers */ |
1da177e4 | 10633 | if (dev->reg_state == NETREG_UNINITIALIZED) { |
74d332c1 | 10634 | netdev_freemem(dev); |
1da177e4 LT |
10635 | return; |
10636 | } | |
10637 | ||
10638 | BUG_ON(dev->reg_state != NETREG_UNREGISTERED); | |
10639 | dev->reg_state = NETREG_RELEASED; | |
10640 | ||
43cb76d9 GKH |
10641 | /* will free via device release */ |
10642 | put_device(&dev->dev); | |
1da177e4 | 10643 | } |
d1b19dff | 10644 | EXPORT_SYMBOL(free_netdev); |
4ec93edb | 10645 | |
f0db275a SH |
10646 | /** |
10647 | * synchronize_net - Synchronize with packet receive processing | |
10648 | * | |
10649 | * Wait for packets currently being received to be done. | |
10650 | * Does not block later packets from starting. | |
10651 | */ | |
4ec93edb | 10652 | void synchronize_net(void) |
1da177e4 LT |
10653 | { |
10654 | might_sleep(); | |
be3fc413 ED |
10655 | if (rtnl_is_locked()) |
10656 | synchronize_rcu_expedited(); | |
10657 | else | |
10658 | synchronize_rcu(); | |
1da177e4 | 10659 | } |
d1b19dff | 10660 | EXPORT_SYMBOL(synchronize_net); |
1da177e4 LT |
10661 | |
10662 | /** | |
44a0873d | 10663 | * unregister_netdevice_queue - remove device from the kernel |
1da177e4 | 10664 | * @dev: device |
44a0873d | 10665 | * @head: list |
6ebfbc06 | 10666 | * |
1da177e4 | 10667 | * This function shuts down a device interface and removes it |
d59b54b1 | 10668 | * from the kernel tables. |
44a0873d | 10669 | * If head not NULL, device is queued to be unregistered later. |
1da177e4 LT |
10670 | * |
10671 | * Callers must hold the rtnl semaphore. You may want | |
10672 | * unregister_netdev() instead of this. | |
10673 | */ | |
10674 | ||
44a0873d | 10675 | void unregister_netdevice_queue(struct net_device *dev, struct list_head *head) |
1da177e4 | 10676 | { |
a6620712 HX |
10677 | ASSERT_RTNL(); |
10678 | ||
44a0873d | 10679 | if (head) { |
9fdce099 | 10680 | list_move_tail(&dev->unreg_list, head); |
44a0873d ED |
10681 | } else { |
10682 | rollback_registered(dev); | |
10683 | /* Finish processing unregister after unlock */ | |
10684 | net_set_todo(dev); | |
10685 | } | |
1da177e4 | 10686 | } |
44a0873d | 10687 | EXPORT_SYMBOL(unregister_netdevice_queue); |
1da177e4 | 10688 | |
9b5e383c ED |
10689 | /** |
10690 | * unregister_netdevice_many - unregister many devices | |
10691 | * @head: list of devices | |
87757a91 ED |
10692 | * |
10693 | * Note: As most callers use a stack allocated list_head, | |
10694 | * we force a list_del() to make sure stack wont be corrupted later. | |
9b5e383c ED |
10695 | */ |
10696 | void unregister_netdevice_many(struct list_head *head) | |
10697 | { | |
10698 | struct net_device *dev; | |
10699 | ||
10700 | if (!list_empty(head)) { | |
10701 | rollback_registered_many(head); | |
10702 | list_for_each_entry(dev, head, unreg_list) | |
10703 | net_set_todo(dev); | |
87757a91 | 10704 | list_del(head); |
9b5e383c ED |
10705 | } |
10706 | } | |
63c8099d | 10707 | EXPORT_SYMBOL(unregister_netdevice_many); |
9b5e383c | 10708 | |
1da177e4 LT |
10709 | /** |
10710 | * unregister_netdev - remove device from the kernel | |
10711 | * @dev: device | |
10712 | * | |
10713 | * This function shuts down a device interface and removes it | |
d59b54b1 | 10714 | * from the kernel tables. |
1da177e4 LT |
10715 | * |
10716 | * This is just a wrapper for unregister_netdevice that takes | |
10717 | * the rtnl semaphore. In general you want to use this and not | |
10718 | * unregister_netdevice. | |
10719 | */ | |
10720 | void unregister_netdev(struct net_device *dev) | |
10721 | { | |
10722 | rtnl_lock(); | |
10723 | unregister_netdevice(dev); | |
10724 | rtnl_unlock(); | |
10725 | } | |
1da177e4 LT |
10726 | EXPORT_SYMBOL(unregister_netdev); |
10727 | ||
ce286d32 EB |
10728 | /** |
10729 | * dev_change_net_namespace - move device to different nethost namespace | |
10730 | * @dev: device | |
10731 | * @net: network namespace | |
10732 | * @pat: If not NULL name pattern to try if the current device name | |
10733 | * is already taken in the destination network namespace. | |
10734 | * | |
10735 | * This function shuts down a device interface and moves it | |
10736 | * to a new network namespace. On success 0 is returned, on | |
10737 | * a failure a netagive errno code is returned. | |
10738 | * | |
10739 | * Callers must hold the rtnl semaphore. | |
10740 | */ | |
10741 | ||
10742 | int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat) | |
10743 | { | |
ef6a4c88 | 10744 | struct net *net_old = dev_net(dev); |
38e01b30 | 10745 | int err, new_nsid, new_ifindex; |
ce286d32 EB |
10746 | |
10747 | ASSERT_RTNL(); | |
10748 | ||
10749 | /* Don't allow namespace local devices to be moved. */ | |
10750 | err = -EINVAL; | |
10751 | if (dev->features & NETIF_F_NETNS_LOCAL) | |
10752 | goto out; | |
10753 | ||
10754 | /* Ensure the device has been registrered */ | |
ce286d32 EB |
10755 | if (dev->reg_state != NETREG_REGISTERED) |
10756 | goto out; | |
10757 | ||
10758 | /* Get out if there is nothing todo */ | |
10759 | err = 0; | |
ef6a4c88 | 10760 | if (net_eq(net_old, net)) |
ce286d32 EB |
10761 | goto out; |
10762 | ||
10763 | /* Pick the destination device name, and ensure | |
10764 | * we can use it in the destination network namespace. | |
10765 | */ | |
10766 | err = -EEXIST; | |
d9031024 | 10767 | if (__dev_get_by_name(net, dev->name)) { |
ce286d32 EB |
10768 | /* We get here if we can't use the current device name */ |
10769 | if (!pat) | |
10770 | goto out; | |
7892bd08 LR |
10771 | err = dev_get_valid_name(net, dev, pat); |
10772 | if (err < 0) | |
ce286d32 EB |
10773 | goto out; |
10774 | } | |
10775 | ||
10776 | /* | |
10777 | * And now a mini version of register_netdevice unregister_netdevice. | |
10778 | */ | |
10779 | ||
10780 | /* If device is running close it first. */ | |
9b772652 | 10781 | dev_close(dev); |
ce286d32 EB |
10782 | |
10783 | /* And unlink it from device chain */ | |
ce286d32 EB |
10784 | unlist_netdevice(dev); |
10785 | ||
10786 | synchronize_net(); | |
10787 | ||
10788 | /* Shutdown queueing discipline. */ | |
10789 | dev_shutdown(dev); | |
10790 | ||
10791 | /* Notify protocols, that we are about to destroy | |
eb13da1a | 10792 | * this device. They should clean all the things. |
10793 | * | |
10794 | * Note that dev->reg_state stays at NETREG_REGISTERED. | |
10795 | * This is wanted because this way 8021q and macvlan know | |
10796 | * the device is just moving and can keep their slaves up. | |
10797 | */ | |
ce286d32 | 10798 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); |
6549dd43 | 10799 | rcu_barrier(); |
38e01b30 | 10800 | |
d4e4fdf9 | 10801 | new_nsid = peernet2id_alloc(dev_net(dev), net, GFP_KERNEL); |
38e01b30 ND |
10802 | /* If there is an ifindex conflict assign a new one */ |
10803 | if (__dev_get_by_index(net, dev->ifindex)) | |
10804 | new_ifindex = dev_new_index(net); | |
10805 | else | |
10806 | new_ifindex = dev->ifindex; | |
10807 | ||
10808 | rtmsg_ifinfo_newnet(RTM_DELLINK, dev, ~0U, GFP_KERNEL, &new_nsid, | |
10809 | new_ifindex); | |
ce286d32 EB |
10810 | |
10811 | /* | |
10812 | * Flush the unicast and multicast chains | |
10813 | */ | |
a748ee24 | 10814 | dev_uc_flush(dev); |
22bedad3 | 10815 | dev_mc_flush(dev); |
ce286d32 | 10816 | |
4e66ae2e SH |
10817 | /* Send a netdev-removed uevent to the old namespace */ |
10818 | kobject_uevent(&dev->dev.kobj, KOBJ_REMOVE); | |
4c75431a | 10819 | netdev_adjacent_del_links(dev); |
4e66ae2e | 10820 | |
93642e14 JP |
10821 | /* Move per-net netdevice notifiers that are following the netdevice */ |
10822 | move_netdevice_notifiers_dev_net(dev, net); | |
10823 | ||
ce286d32 | 10824 | /* Actually switch the network namespace */ |
c346dca1 | 10825 | dev_net_set(dev, net); |
38e01b30 | 10826 | dev->ifindex = new_ifindex; |
ce286d32 | 10827 | |
4e66ae2e SH |
10828 | /* Send a netdev-add uevent to the new namespace */ |
10829 | kobject_uevent(&dev->dev.kobj, KOBJ_ADD); | |
4c75431a | 10830 | netdev_adjacent_add_links(dev); |
4e66ae2e | 10831 | |
8b41d188 | 10832 | /* Fixup kobjects */ |
a1b3f594 | 10833 | err = device_rename(&dev->dev, dev->name); |
8b41d188 | 10834 | WARN_ON(err); |
ce286d32 | 10835 | |
ef6a4c88 CB |
10836 | /* Adapt owner in case owning user namespace of target network |
10837 | * namespace is different from the original one. | |
10838 | */ | |
10839 | err = netdev_change_owner(dev, net_old, net); | |
10840 | WARN_ON(err); | |
10841 | ||
ce286d32 EB |
10842 | /* Add the device back in the hashes */ |
10843 | list_netdevice(dev); | |
10844 | ||
10845 | /* Notify protocols, that a new device appeared. */ | |
10846 | call_netdevice_notifiers(NETDEV_REGISTER, dev); | |
10847 | ||
d90a909e EB |
10848 | /* |
10849 | * Prevent userspace races by waiting until the network | |
10850 | * device is fully setup before sending notifications. | |
10851 | */ | |
7f294054 | 10852 | rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL); |
d90a909e | 10853 | |
ce286d32 EB |
10854 | synchronize_net(); |
10855 | err = 0; | |
10856 | out: | |
10857 | return err; | |
10858 | } | |
463d0183 | 10859 | EXPORT_SYMBOL_GPL(dev_change_net_namespace); |
ce286d32 | 10860 | |
f0bf90de | 10861 | static int dev_cpu_dead(unsigned int oldcpu) |
1da177e4 LT |
10862 | { |
10863 | struct sk_buff **list_skb; | |
1da177e4 | 10864 | struct sk_buff *skb; |
f0bf90de | 10865 | unsigned int cpu; |
97d8b6e3 | 10866 | struct softnet_data *sd, *oldsd, *remsd = NULL; |
1da177e4 | 10867 | |
1da177e4 LT |
10868 | local_irq_disable(); |
10869 | cpu = smp_processor_id(); | |
10870 | sd = &per_cpu(softnet_data, cpu); | |
10871 | oldsd = &per_cpu(softnet_data, oldcpu); | |
10872 | ||
10873 | /* Find end of our completion_queue. */ | |
10874 | list_skb = &sd->completion_queue; | |
10875 | while (*list_skb) | |
10876 | list_skb = &(*list_skb)->next; | |
10877 | /* Append completion queue from offline CPU. */ | |
10878 | *list_skb = oldsd->completion_queue; | |
10879 | oldsd->completion_queue = NULL; | |
10880 | ||
1da177e4 | 10881 | /* Append output queue from offline CPU. */ |
a9cbd588 CG |
10882 | if (oldsd->output_queue) { |
10883 | *sd->output_queue_tailp = oldsd->output_queue; | |
10884 | sd->output_queue_tailp = oldsd->output_queue_tailp; | |
10885 | oldsd->output_queue = NULL; | |
10886 | oldsd->output_queue_tailp = &oldsd->output_queue; | |
10887 | } | |
ac64da0b ED |
10888 | /* Append NAPI poll list from offline CPU, with one exception : |
10889 | * process_backlog() must be called by cpu owning percpu backlog. | |
10890 | * We properly handle process_queue & input_pkt_queue later. | |
10891 | */ | |
10892 | while (!list_empty(&oldsd->poll_list)) { | |
10893 | struct napi_struct *napi = list_first_entry(&oldsd->poll_list, | |
10894 | struct napi_struct, | |
10895 | poll_list); | |
10896 | ||
10897 | list_del_init(&napi->poll_list); | |
10898 | if (napi->poll == process_backlog) | |
10899 | napi->state = 0; | |
10900 | else | |
10901 | ____napi_schedule(sd, napi); | |
264524d5 | 10902 | } |
1da177e4 LT |
10903 | |
10904 | raise_softirq_irqoff(NET_TX_SOFTIRQ); | |
10905 | local_irq_enable(); | |
10906 | ||
773fc8f6 | 10907 | #ifdef CONFIG_RPS |
10908 | remsd = oldsd->rps_ipi_list; | |
10909 | oldsd->rps_ipi_list = NULL; | |
10910 | #endif | |
10911 | /* send out pending IPI's on offline CPU */ | |
10912 | net_rps_send_ipi(remsd); | |
10913 | ||
1da177e4 | 10914 | /* Process offline CPU's input_pkt_queue */ |
76cc8b13 | 10915 | while ((skb = __skb_dequeue(&oldsd->process_queue))) { |
91e83133 | 10916 | netif_rx_ni(skb); |
76cc8b13 | 10917 | input_queue_head_incr(oldsd); |
fec5e652 | 10918 | } |
ac64da0b | 10919 | while ((skb = skb_dequeue(&oldsd->input_pkt_queue))) { |
91e83133 | 10920 | netif_rx_ni(skb); |
76cc8b13 TH |
10921 | input_queue_head_incr(oldsd); |
10922 | } | |
1da177e4 | 10923 | |
f0bf90de | 10924 | return 0; |
1da177e4 | 10925 | } |
1da177e4 | 10926 | |
7f353bf2 | 10927 | /** |
b63365a2 HX |
10928 | * netdev_increment_features - increment feature set by one |
10929 | * @all: current feature set | |
10930 | * @one: new feature set | |
10931 | * @mask: mask feature set | |
7f353bf2 HX |
10932 | * |
10933 | * Computes a new feature set after adding a device with feature set | |
b63365a2 HX |
10934 | * @one to the master device with current feature set @all. Will not |
10935 | * enable anything that is off in @mask. Returns the new feature set. | |
7f353bf2 | 10936 | */ |
c8f44aff MM |
10937 | netdev_features_t netdev_increment_features(netdev_features_t all, |
10938 | netdev_features_t one, netdev_features_t mask) | |
b63365a2 | 10939 | { |
c8cd0989 | 10940 | if (mask & NETIF_F_HW_CSUM) |
a188222b | 10941 | mask |= NETIF_F_CSUM_MASK; |
1742f183 | 10942 | mask |= NETIF_F_VLAN_CHALLENGED; |
7f353bf2 | 10943 | |
a188222b | 10944 | all |= one & (NETIF_F_ONE_FOR_ALL | NETIF_F_CSUM_MASK) & mask; |
1742f183 | 10945 | all &= one | ~NETIF_F_ALL_FOR_ALL; |
c6e1a0d1 | 10946 | |
1742f183 | 10947 | /* If one device supports hw checksumming, set for all. */ |
c8cd0989 TH |
10948 | if (all & NETIF_F_HW_CSUM) |
10949 | all &= ~(NETIF_F_CSUM_MASK & ~NETIF_F_HW_CSUM); | |
7f353bf2 HX |
10950 | |
10951 | return all; | |
10952 | } | |
b63365a2 | 10953 | EXPORT_SYMBOL(netdev_increment_features); |
7f353bf2 | 10954 | |
430f03cd | 10955 | static struct hlist_head * __net_init netdev_create_hash(void) |
30d97d35 PE |
10956 | { |
10957 | int i; | |
10958 | struct hlist_head *hash; | |
10959 | ||
6da2ec56 | 10960 | hash = kmalloc_array(NETDEV_HASHENTRIES, sizeof(*hash), GFP_KERNEL); |
30d97d35 PE |
10961 | if (hash != NULL) |
10962 | for (i = 0; i < NETDEV_HASHENTRIES; i++) | |
10963 | INIT_HLIST_HEAD(&hash[i]); | |
10964 | ||
10965 | return hash; | |
10966 | } | |
10967 | ||
881d966b | 10968 | /* Initialize per network namespace state */ |
4665079c | 10969 | static int __net_init netdev_init(struct net *net) |
881d966b | 10970 | { |
d9f37d01 | 10971 | BUILD_BUG_ON(GRO_HASH_BUCKETS > |
c593642c | 10972 | 8 * sizeof_field(struct napi_struct, gro_bitmask)); |
d9f37d01 | 10973 | |
734b6541 RM |
10974 | if (net != &init_net) |
10975 | INIT_LIST_HEAD(&net->dev_base_head); | |
881d966b | 10976 | |
30d97d35 PE |
10977 | net->dev_name_head = netdev_create_hash(); |
10978 | if (net->dev_name_head == NULL) | |
10979 | goto err_name; | |
881d966b | 10980 | |
30d97d35 PE |
10981 | net->dev_index_head = netdev_create_hash(); |
10982 | if (net->dev_index_head == NULL) | |
10983 | goto err_idx; | |
881d966b | 10984 | |
a30c7b42 JP |
10985 | RAW_INIT_NOTIFIER_HEAD(&net->netdev_chain); |
10986 | ||
881d966b | 10987 | return 0; |
30d97d35 PE |
10988 | |
10989 | err_idx: | |
10990 | kfree(net->dev_name_head); | |
10991 | err_name: | |
10992 | return -ENOMEM; | |
881d966b EB |
10993 | } |
10994 | ||
f0db275a SH |
10995 | /** |
10996 | * netdev_drivername - network driver for the device | |
10997 | * @dev: network device | |
f0db275a SH |
10998 | * |
10999 | * Determine network driver for device. | |
11000 | */ | |
3019de12 | 11001 | const char *netdev_drivername(const struct net_device *dev) |
6579e57b | 11002 | { |
cf04a4c7 SH |
11003 | const struct device_driver *driver; |
11004 | const struct device *parent; | |
3019de12 | 11005 | const char *empty = ""; |
6579e57b AV |
11006 | |
11007 | parent = dev->dev.parent; | |
6579e57b | 11008 | if (!parent) |
3019de12 | 11009 | return empty; |
6579e57b AV |
11010 | |
11011 | driver = parent->driver; | |
11012 | if (driver && driver->name) | |
3019de12 DM |
11013 | return driver->name; |
11014 | return empty; | |
6579e57b AV |
11015 | } |
11016 | ||
6ea754eb JP |
11017 | static void __netdev_printk(const char *level, const struct net_device *dev, |
11018 | struct va_format *vaf) | |
256df2f3 | 11019 | { |
b004ff49 | 11020 | if (dev && dev->dev.parent) { |
6ea754eb JP |
11021 | dev_printk_emit(level[1] - '0', |
11022 | dev->dev.parent, | |
11023 | "%s %s %s%s: %pV", | |
11024 | dev_driver_string(dev->dev.parent), | |
11025 | dev_name(dev->dev.parent), | |
11026 | netdev_name(dev), netdev_reg_state(dev), | |
11027 | vaf); | |
b004ff49 | 11028 | } else if (dev) { |
6ea754eb JP |
11029 | printk("%s%s%s: %pV", |
11030 | level, netdev_name(dev), netdev_reg_state(dev), vaf); | |
b004ff49 | 11031 | } else { |
6ea754eb | 11032 | printk("%s(NULL net_device): %pV", level, vaf); |
b004ff49 | 11033 | } |
256df2f3 JP |
11034 | } |
11035 | ||
6ea754eb JP |
11036 | void netdev_printk(const char *level, const struct net_device *dev, |
11037 | const char *format, ...) | |
256df2f3 JP |
11038 | { |
11039 | struct va_format vaf; | |
11040 | va_list args; | |
256df2f3 JP |
11041 | |
11042 | va_start(args, format); | |
11043 | ||
11044 | vaf.fmt = format; | |
11045 | vaf.va = &args; | |
11046 | ||
6ea754eb | 11047 | __netdev_printk(level, dev, &vaf); |
b004ff49 | 11048 | |
256df2f3 | 11049 | va_end(args); |
256df2f3 JP |
11050 | } |
11051 | EXPORT_SYMBOL(netdev_printk); | |
11052 | ||
11053 | #define define_netdev_printk_level(func, level) \ | |
6ea754eb | 11054 | void func(const struct net_device *dev, const char *fmt, ...) \ |
256df2f3 | 11055 | { \ |
256df2f3 JP |
11056 | struct va_format vaf; \ |
11057 | va_list args; \ | |
11058 | \ | |
11059 | va_start(args, fmt); \ | |
11060 | \ | |
11061 | vaf.fmt = fmt; \ | |
11062 | vaf.va = &args; \ | |
11063 | \ | |
6ea754eb | 11064 | __netdev_printk(level, dev, &vaf); \ |
b004ff49 | 11065 | \ |
256df2f3 | 11066 | va_end(args); \ |
256df2f3 JP |
11067 | } \ |
11068 | EXPORT_SYMBOL(func); | |
11069 | ||
11070 | define_netdev_printk_level(netdev_emerg, KERN_EMERG); | |
11071 | define_netdev_printk_level(netdev_alert, KERN_ALERT); | |
11072 | define_netdev_printk_level(netdev_crit, KERN_CRIT); | |
11073 | define_netdev_printk_level(netdev_err, KERN_ERR); | |
11074 | define_netdev_printk_level(netdev_warn, KERN_WARNING); | |
11075 | define_netdev_printk_level(netdev_notice, KERN_NOTICE); | |
11076 | define_netdev_printk_level(netdev_info, KERN_INFO); | |
11077 | ||
4665079c | 11078 | static void __net_exit netdev_exit(struct net *net) |
881d966b EB |
11079 | { |
11080 | kfree(net->dev_name_head); | |
11081 | kfree(net->dev_index_head); | |
ee21b18b VA |
11082 | if (net != &init_net) |
11083 | WARN_ON_ONCE(!list_empty(&net->dev_base_head)); | |
881d966b EB |
11084 | } |
11085 | ||
022cbae6 | 11086 | static struct pernet_operations __net_initdata netdev_net_ops = { |
881d966b EB |
11087 | .init = netdev_init, |
11088 | .exit = netdev_exit, | |
11089 | }; | |
11090 | ||
4665079c | 11091 | static void __net_exit default_device_exit(struct net *net) |
ce286d32 | 11092 | { |
e008b5fc | 11093 | struct net_device *dev, *aux; |
ce286d32 | 11094 | /* |
e008b5fc | 11095 | * Push all migratable network devices back to the |
ce286d32 EB |
11096 | * initial network namespace |
11097 | */ | |
11098 | rtnl_lock(); | |
e008b5fc | 11099 | for_each_netdev_safe(net, dev, aux) { |
ce286d32 | 11100 | int err; |
aca51397 | 11101 | char fb_name[IFNAMSIZ]; |
ce286d32 EB |
11102 | |
11103 | /* Ignore unmoveable devices (i.e. loopback) */ | |
11104 | if (dev->features & NETIF_F_NETNS_LOCAL) | |
11105 | continue; | |
11106 | ||
e008b5fc EB |
11107 | /* Leave virtual devices for the generic cleanup */ |
11108 | if (dev->rtnl_link_ops) | |
11109 | continue; | |
d0c082ce | 11110 | |
25985edc | 11111 | /* Push remaining network devices to init_net */ |
aca51397 | 11112 | snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex); |
55b40dbf JP |
11113 | if (__dev_get_by_name(&init_net, fb_name)) |
11114 | snprintf(fb_name, IFNAMSIZ, "dev%%d"); | |
aca51397 | 11115 | err = dev_change_net_namespace(dev, &init_net, fb_name); |
ce286d32 | 11116 | if (err) { |
7b6cd1ce JP |
11117 | pr_emerg("%s: failed to move %s to init_net: %d\n", |
11118 | __func__, dev->name, err); | |
aca51397 | 11119 | BUG(); |
ce286d32 EB |
11120 | } |
11121 | } | |
11122 | rtnl_unlock(); | |
11123 | } | |
11124 | ||
50624c93 EB |
11125 | static void __net_exit rtnl_lock_unregistering(struct list_head *net_list) |
11126 | { | |
11127 | /* Return with the rtnl_lock held when there are no network | |
11128 | * devices unregistering in any network namespace in net_list. | |
11129 | */ | |
11130 | struct net *net; | |
11131 | bool unregistering; | |
ff960a73 | 11132 | DEFINE_WAIT_FUNC(wait, woken_wake_function); |
50624c93 | 11133 | |
ff960a73 | 11134 | add_wait_queue(&netdev_unregistering_wq, &wait); |
50624c93 | 11135 | for (;;) { |
50624c93 EB |
11136 | unregistering = false; |
11137 | rtnl_lock(); | |
11138 | list_for_each_entry(net, net_list, exit_list) { | |
11139 | if (net->dev_unreg_count > 0) { | |
11140 | unregistering = true; | |
11141 | break; | |
11142 | } | |
11143 | } | |
11144 | if (!unregistering) | |
11145 | break; | |
11146 | __rtnl_unlock(); | |
ff960a73 PZ |
11147 | |
11148 | wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT); | |
50624c93 | 11149 | } |
ff960a73 | 11150 | remove_wait_queue(&netdev_unregistering_wq, &wait); |
50624c93 EB |
11151 | } |
11152 | ||
04dc7f6b EB |
11153 | static void __net_exit default_device_exit_batch(struct list_head *net_list) |
11154 | { | |
11155 | /* At exit all network devices most be removed from a network | |
b595076a | 11156 | * namespace. Do this in the reverse order of registration. |
04dc7f6b EB |
11157 | * Do this across as many network namespaces as possible to |
11158 | * improve batching efficiency. | |
11159 | */ | |
11160 | struct net_device *dev; | |
11161 | struct net *net; | |
11162 | LIST_HEAD(dev_kill_list); | |
11163 | ||
50624c93 EB |
11164 | /* To prevent network device cleanup code from dereferencing |
11165 | * loopback devices or network devices that have been freed | |
11166 | * wait here for all pending unregistrations to complete, | |
11167 | * before unregistring the loopback device and allowing the | |
11168 | * network namespace be freed. | |
11169 | * | |
11170 | * The netdev todo list containing all network devices | |
11171 | * unregistrations that happen in default_device_exit_batch | |
11172 | * will run in the rtnl_unlock() at the end of | |
11173 | * default_device_exit_batch. | |
11174 | */ | |
11175 | rtnl_lock_unregistering(net_list); | |
04dc7f6b EB |
11176 | list_for_each_entry(net, net_list, exit_list) { |
11177 | for_each_netdev_reverse(net, dev) { | |
b0ab2fab | 11178 | if (dev->rtnl_link_ops && dev->rtnl_link_ops->dellink) |
04dc7f6b EB |
11179 | dev->rtnl_link_ops->dellink(dev, &dev_kill_list); |
11180 | else | |
11181 | unregister_netdevice_queue(dev, &dev_kill_list); | |
11182 | } | |
11183 | } | |
11184 | unregister_netdevice_many(&dev_kill_list); | |
11185 | rtnl_unlock(); | |
11186 | } | |
11187 | ||
022cbae6 | 11188 | static struct pernet_operations __net_initdata default_device_ops = { |
ce286d32 | 11189 | .exit = default_device_exit, |
04dc7f6b | 11190 | .exit_batch = default_device_exit_batch, |
ce286d32 EB |
11191 | }; |
11192 | ||
1da177e4 LT |
11193 | /* |
11194 | * Initialize the DEV module. At boot time this walks the device list and | |
11195 | * unhooks any devices that fail to initialise (normally hardware not | |
11196 | * present) and leaves us with a valid list of present and active devices. | |
11197 | * | |
11198 | */ | |
11199 | ||
11200 | /* | |
11201 | * This is called single threaded during boot, so no need | |
11202 | * to take the rtnl semaphore. | |
11203 | */ | |
11204 | static int __init net_dev_init(void) | |
11205 | { | |
11206 | int i, rc = -ENOMEM; | |
11207 | ||
11208 | BUG_ON(!dev_boot_phase); | |
11209 | ||
1da177e4 LT |
11210 | if (dev_proc_init()) |
11211 | goto out; | |
11212 | ||
8b41d188 | 11213 | if (netdev_kobject_init()) |
1da177e4 LT |
11214 | goto out; |
11215 | ||
11216 | INIT_LIST_HEAD(&ptype_all); | |
82d8a867 | 11217 | for (i = 0; i < PTYPE_HASH_SIZE; i++) |
1da177e4 LT |
11218 | INIT_LIST_HEAD(&ptype_base[i]); |
11219 | ||
62532da9 VY |
11220 | INIT_LIST_HEAD(&offload_base); |
11221 | ||
881d966b EB |
11222 | if (register_pernet_subsys(&netdev_net_ops)) |
11223 | goto out; | |
1da177e4 LT |
11224 | |
11225 | /* | |
11226 | * Initialise the packet receive queues. | |
11227 | */ | |
11228 | ||
6f912042 | 11229 | for_each_possible_cpu(i) { |
41852497 | 11230 | struct work_struct *flush = per_cpu_ptr(&flush_works, i); |
e36fa2f7 | 11231 | struct softnet_data *sd = &per_cpu(softnet_data, i); |
1da177e4 | 11232 | |
41852497 ED |
11233 | INIT_WORK(flush, flush_backlog); |
11234 | ||
e36fa2f7 | 11235 | skb_queue_head_init(&sd->input_pkt_queue); |
6e7676c1 | 11236 | skb_queue_head_init(&sd->process_queue); |
f53c7239 SK |
11237 | #ifdef CONFIG_XFRM_OFFLOAD |
11238 | skb_queue_head_init(&sd->xfrm_backlog); | |
11239 | #endif | |
e36fa2f7 | 11240 | INIT_LIST_HEAD(&sd->poll_list); |
a9cbd588 | 11241 | sd->output_queue_tailp = &sd->output_queue; |
df334545 | 11242 | #ifdef CONFIG_RPS |
545b8c8d | 11243 | INIT_CSD(&sd->csd, rps_trigger_softirq, sd); |
e36fa2f7 | 11244 | sd->cpu = i; |
1e94d72f | 11245 | #endif |
0a9627f2 | 11246 | |
7c4ec749 | 11247 | init_gro_hash(&sd->backlog); |
e36fa2f7 ED |
11248 | sd->backlog.poll = process_backlog; |
11249 | sd->backlog.weight = weight_p; | |
1da177e4 LT |
11250 | } |
11251 | ||
1da177e4 LT |
11252 | dev_boot_phase = 0; |
11253 | ||
505d4f73 EB |
11254 | /* The loopback device is special if any other network devices |
11255 | * is present in a network namespace the loopback device must | |
11256 | * be present. Since we now dynamically allocate and free the | |
11257 | * loopback device ensure this invariant is maintained by | |
11258 | * keeping the loopback device as the first device on the | |
11259 | * list of network devices. Ensuring the loopback devices | |
11260 | * is the first device that appears and the last network device | |
11261 | * that disappears. | |
11262 | */ | |
11263 | if (register_pernet_device(&loopback_net_ops)) | |
11264 | goto out; | |
11265 | ||
11266 | if (register_pernet_device(&default_device_ops)) | |
11267 | goto out; | |
11268 | ||
962cf36c CM |
11269 | open_softirq(NET_TX_SOFTIRQ, net_tx_action); |
11270 | open_softirq(NET_RX_SOFTIRQ, net_rx_action); | |
1da177e4 | 11271 | |
f0bf90de SAS |
11272 | rc = cpuhp_setup_state_nocalls(CPUHP_NET_DEV_DEAD, "net/dev:dead", |
11273 | NULL, dev_cpu_dead); | |
11274 | WARN_ON(rc < 0); | |
1da177e4 LT |
11275 | rc = 0; |
11276 | out: | |
11277 | return rc; | |
11278 | } | |
11279 | ||
11280 | subsys_initcall(net_dev_init); |