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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> |
4f3da95d | 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> |
1da177e4 | 101 | #include <net/dst.h> |
fc4099f1 | 102 | #include <net/dst_metadata.h> |
1da177e4 | 103 | #include <net/pkt_sched.h> |
87d83093 | 104 | #include <net/pkt_cls.h> |
1da177e4 | 105 | #include <net/checksum.h> |
44540960 | 106 | #include <net/xfrm.h> |
1da177e4 LT |
107 | #include <linux/highmem.h> |
108 | #include <linux/init.h> | |
1da177e4 | 109 | #include <linux/module.h> |
1da177e4 LT |
110 | #include <linux/netpoll.h> |
111 | #include <linux/rcupdate.h> | |
112 | #include <linux/delay.h> | |
1da177e4 | 113 | #include <net/iw_handler.h> |
1da177e4 | 114 | #include <asm/current.h> |
5bdb9886 | 115 | #include <linux/audit.h> |
db217334 | 116 | #include <linux/dmaengine.h> |
f6a78bfc | 117 | #include <linux/err.h> |
c7fa9d18 | 118 | #include <linux/ctype.h> |
723e98b7 | 119 | #include <linux/if_arp.h> |
6de329e2 | 120 | #include <linux/if_vlan.h> |
8f0f2223 | 121 | #include <linux/ip.h> |
ad55dcaf | 122 | #include <net/ip.h> |
25cd9ba0 | 123 | #include <net/mpls.h> |
8f0f2223 DM |
124 | #include <linux/ipv6.h> |
125 | #include <linux/in.h> | |
b6b2fed1 DM |
126 | #include <linux/jhash.h> |
127 | #include <linux/random.h> | |
9cbc1cb8 | 128 | #include <trace/events/napi.h> |
cf66ba58 | 129 | #include <trace/events/net.h> |
07dc22e7 | 130 | #include <trace/events/skb.h> |
caeda9b9 | 131 | #include <linux/inetdevice.h> |
c445477d | 132 | #include <linux/cpu_rmap.h> |
c5905afb | 133 | #include <linux/static_key.h> |
af12fa6e | 134 | #include <linux/hashtable.h> |
60877a32 | 135 | #include <linux/vmalloc.h> |
529d0489 | 136 | #include <linux/if_macvlan.h> |
e7fd2885 | 137 | #include <linux/errqueue.h> |
3b47d303 | 138 | #include <linux/hrtimer.h> |
e687ad60 | 139 | #include <linux/netfilter_ingress.h> |
40e4e713 | 140 | #include <linux/crash_dump.h> |
b72b5bf6 | 141 | #include <linux/sctp.h> |
ae847f40 | 142 | #include <net/udp_tunnel.h> |
6621dd29 | 143 | #include <linux/net_namespace.h> |
aaa5d90b | 144 | #include <linux/indirect_call_wrapper.h> |
af3836df | 145 | #include <net/devlink.h> |
1da177e4 | 146 | |
342709ef PE |
147 | #include "net-sysfs.h" |
148 | ||
d565b0a1 HX |
149 | #define MAX_GRO_SKBS 8 |
150 | ||
5d38a079 HX |
151 | /* This should be increased if a protocol with a bigger head is added. */ |
152 | #define GRO_MAX_HEAD (MAX_HEADER + 128) | |
153 | ||
1da177e4 | 154 | static DEFINE_SPINLOCK(ptype_lock); |
62532da9 | 155 | static DEFINE_SPINLOCK(offload_lock); |
900ff8c6 CW |
156 | struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly; |
157 | struct list_head ptype_all __read_mostly; /* Taps */ | |
62532da9 | 158 | static struct list_head offload_base __read_mostly; |
1da177e4 | 159 | |
ae78dbfa | 160 | static int netif_rx_internal(struct sk_buff *skb); |
54951194 | 161 | static int call_netdevice_notifiers_info(unsigned long val, |
54951194 | 162 | struct netdev_notifier_info *info); |
26372605 PM |
163 | static int call_netdevice_notifiers_extack(unsigned long val, |
164 | struct net_device *dev, | |
165 | struct netlink_ext_ack *extack); | |
90b602f8 | 166 | static struct napi_struct *napi_by_id(unsigned int napi_id); |
ae78dbfa | 167 | |
1da177e4 | 168 | /* |
7562f876 | 169 | * The @dev_base_head list is protected by @dev_base_lock and the rtnl |
1da177e4 LT |
170 | * semaphore. |
171 | * | |
c6d14c84 | 172 | * Pure readers hold dev_base_lock for reading, or rcu_read_lock() |
1da177e4 LT |
173 | * |
174 | * Writers must hold the rtnl semaphore while they loop through the | |
7562f876 | 175 | * dev_base_head list, and hold dev_base_lock for writing when they do the |
1da177e4 LT |
176 | * actual updates. This allows pure readers to access the list even |
177 | * while a writer is preparing to update it. | |
178 | * | |
179 | * To put it another way, dev_base_lock is held for writing only to | |
180 | * protect against pure readers; the rtnl semaphore provides the | |
181 | * protection against other writers. | |
182 | * | |
183 | * See, for example usages, register_netdevice() and | |
184 | * unregister_netdevice(), which must be called with the rtnl | |
185 | * semaphore held. | |
186 | */ | |
1da177e4 | 187 | DEFINE_RWLOCK(dev_base_lock); |
1da177e4 LT |
188 | EXPORT_SYMBOL(dev_base_lock); |
189 | ||
6c557001 FW |
190 | static DEFINE_MUTEX(ifalias_mutex); |
191 | ||
af12fa6e ET |
192 | /* protects napi_hash addition/deletion and napi_gen_id */ |
193 | static DEFINE_SPINLOCK(napi_hash_lock); | |
194 | ||
52bd2d62 | 195 | static unsigned int napi_gen_id = NR_CPUS; |
6180d9de | 196 | static DEFINE_READ_MOSTLY_HASHTABLE(napi_hash, 8); |
af12fa6e | 197 | |
4f3da95d | 198 | static DECLARE_RWSEM(devnet_rename_sem); |
c91f6df2 | 199 | |
4e985ada TG |
200 | static inline void dev_base_seq_inc(struct net *net) |
201 | { | |
643aa9cb | 202 | while (++net->dev_base_seq == 0) |
203 | ; | |
4e985ada TG |
204 | } |
205 | ||
881d966b | 206 | static inline struct hlist_head *dev_name_hash(struct net *net, const char *name) |
1da177e4 | 207 | { |
8387ff25 | 208 | unsigned int hash = full_name_hash(net, name, strnlen(name, IFNAMSIZ)); |
95c96174 | 209 | |
08e9897d | 210 | return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)]; |
1da177e4 LT |
211 | } |
212 | ||
881d966b | 213 | static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex) |
1da177e4 | 214 | { |
7c28bd0b | 215 | return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)]; |
1da177e4 LT |
216 | } |
217 | ||
e36fa2f7 | 218 | static inline void rps_lock(struct softnet_data *sd) |
152102c7 CG |
219 | { |
220 | #ifdef CONFIG_RPS | |
e36fa2f7 | 221 | spin_lock(&sd->input_pkt_queue.lock); |
152102c7 CG |
222 | #endif |
223 | } | |
224 | ||
e36fa2f7 | 225 | static inline void rps_unlock(struct softnet_data *sd) |
152102c7 CG |
226 | { |
227 | #ifdef CONFIG_RPS | |
e36fa2f7 | 228 | spin_unlock(&sd->input_pkt_queue.lock); |
152102c7 CG |
229 | #endif |
230 | } | |
231 | ||
ce286d32 | 232 | /* Device list insertion */ |
53759be9 | 233 | static void list_netdevice(struct net_device *dev) |
ce286d32 | 234 | { |
c346dca1 | 235 | struct net *net = dev_net(dev); |
ce286d32 EB |
236 | |
237 | ASSERT_RTNL(); | |
238 | ||
239 | write_lock_bh(&dev_base_lock); | |
c6d14c84 | 240 | list_add_tail_rcu(&dev->dev_list, &net->dev_base_head); |
72c9528b | 241 | hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name)); |
fb699dfd ED |
242 | hlist_add_head_rcu(&dev->index_hlist, |
243 | dev_index_hash(net, dev->ifindex)); | |
ce286d32 | 244 | write_unlock_bh(&dev_base_lock); |
4e985ada TG |
245 | |
246 | dev_base_seq_inc(net); | |
ce286d32 EB |
247 | } |
248 | ||
fb699dfd ED |
249 | /* Device list removal |
250 | * caller must respect a RCU grace period before freeing/reusing dev | |
251 | */ | |
ce286d32 EB |
252 | static void unlist_netdevice(struct net_device *dev) |
253 | { | |
254 | ASSERT_RTNL(); | |
255 | ||
256 | /* Unlink dev from the device chain */ | |
257 | write_lock_bh(&dev_base_lock); | |
c6d14c84 | 258 | list_del_rcu(&dev->dev_list); |
72c9528b | 259 | hlist_del_rcu(&dev->name_hlist); |
fb699dfd | 260 | hlist_del_rcu(&dev->index_hlist); |
ce286d32 | 261 | write_unlock_bh(&dev_base_lock); |
4e985ada TG |
262 | |
263 | dev_base_seq_inc(dev_net(dev)); | |
ce286d32 EB |
264 | } |
265 | ||
1da177e4 LT |
266 | /* |
267 | * Our notifier list | |
268 | */ | |
269 | ||
f07d5b94 | 270 | static RAW_NOTIFIER_HEAD(netdev_chain); |
1da177e4 LT |
271 | |
272 | /* | |
273 | * Device drivers call our routines to queue packets here. We empty the | |
274 | * queue in the local softnet handler. | |
275 | */ | |
bea3348e | 276 | |
9958da05 | 277 | DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data); |
d1b19dff | 278 | EXPORT_PER_CPU_SYMBOL(softnet_data); |
1da177e4 | 279 | |
1da177e4 | 280 | /******************************************************************************* |
eb13da1a | 281 | * |
282 | * Protocol management and registration routines | |
283 | * | |
284 | *******************************************************************************/ | |
1da177e4 | 285 | |
1da177e4 | 286 | |
1da177e4 LT |
287 | /* |
288 | * Add a protocol ID to the list. Now that the input handler is | |
289 | * smarter we can dispense with all the messy stuff that used to be | |
290 | * here. | |
291 | * | |
292 | * BEWARE!!! Protocol handlers, mangling input packets, | |
293 | * MUST BE last in hash buckets and checking protocol handlers | |
294 | * MUST start from promiscuous ptype_all chain in net_bh. | |
295 | * It is true now, do not change it. | |
296 | * Explanation follows: if protocol handler, mangling packet, will | |
297 | * be the first on list, it is not able to sense, that packet | |
298 | * is cloned and should be copied-on-write, so that it will | |
299 | * change it and subsequent readers will get broken packet. | |
300 | * --ANK (980803) | |
301 | */ | |
302 | ||
c07b68e8 ED |
303 | static inline struct list_head *ptype_head(const struct packet_type *pt) |
304 | { | |
305 | if (pt->type == htons(ETH_P_ALL)) | |
7866a621 | 306 | return pt->dev ? &pt->dev->ptype_all : &ptype_all; |
c07b68e8 | 307 | else |
7866a621 SN |
308 | return pt->dev ? &pt->dev->ptype_specific : |
309 | &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK]; | |
c07b68e8 ED |
310 | } |
311 | ||
1da177e4 LT |
312 | /** |
313 | * dev_add_pack - add packet handler | |
314 | * @pt: packet type declaration | |
315 | * | |
316 | * Add a protocol handler to the networking stack. The passed &packet_type | |
317 | * is linked into kernel lists and may not be freed until it has been | |
318 | * removed from the kernel lists. | |
319 | * | |
4ec93edb | 320 | * This call does not sleep therefore it can not |
1da177e4 LT |
321 | * guarantee all CPU's that are in middle of receiving packets |
322 | * will see the new packet type (until the next received packet). | |
323 | */ | |
324 | ||
325 | void dev_add_pack(struct packet_type *pt) | |
326 | { | |
c07b68e8 | 327 | struct list_head *head = ptype_head(pt); |
1da177e4 | 328 | |
c07b68e8 ED |
329 | spin_lock(&ptype_lock); |
330 | list_add_rcu(&pt->list, head); | |
331 | spin_unlock(&ptype_lock); | |
1da177e4 | 332 | } |
d1b19dff | 333 | EXPORT_SYMBOL(dev_add_pack); |
1da177e4 | 334 | |
1da177e4 LT |
335 | /** |
336 | * __dev_remove_pack - remove packet handler | |
337 | * @pt: packet type declaration | |
338 | * | |
339 | * Remove a protocol handler that was previously added to the kernel | |
340 | * protocol handlers by dev_add_pack(). The passed &packet_type is removed | |
341 | * from the kernel lists and can be freed or reused once this function | |
4ec93edb | 342 | * returns. |
1da177e4 LT |
343 | * |
344 | * The packet type might still be in use by receivers | |
345 | * and must not be freed until after all the CPU's have gone | |
346 | * through a quiescent state. | |
347 | */ | |
348 | void __dev_remove_pack(struct packet_type *pt) | |
349 | { | |
c07b68e8 | 350 | struct list_head *head = ptype_head(pt); |
1da177e4 LT |
351 | struct packet_type *pt1; |
352 | ||
c07b68e8 | 353 | spin_lock(&ptype_lock); |
1da177e4 LT |
354 | |
355 | list_for_each_entry(pt1, head, list) { | |
356 | if (pt == pt1) { | |
357 | list_del_rcu(&pt->list); | |
358 | goto out; | |
359 | } | |
360 | } | |
361 | ||
7b6cd1ce | 362 | pr_warn("dev_remove_pack: %p not found\n", pt); |
1da177e4 | 363 | out: |
c07b68e8 | 364 | spin_unlock(&ptype_lock); |
1da177e4 | 365 | } |
d1b19dff ED |
366 | EXPORT_SYMBOL(__dev_remove_pack); |
367 | ||
1da177e4 LT |
368 | /** |
369 | * dev_remove_pack - remove packet handler | |
370 | * @pt: packet type declaration | |
371 | * | |
372 | * Remove a protocol handler that was previously added to the kernel | |
373 | * protocol handlers by dev_add_pack(). The passed &packet_type is removed | |
374 | * from the kernel lists and can be freed or reused once this function | |
375 | * returns. | |
376 | * | |
377 | * This call sleeps to guarantee that no CPU is looking at the packet | |
378 | * type after return. | |
379 | */ | |
380 | void dev_remove_pack(struct packet_type *pt) | |
381 | { | |
382 | __dev_remove_pack(pt); | |
4ec93edb | 383 | |
1da177e4 LT |
384 | synchronize_net(); |
385 | } | |
d1b19dff | 386 | EXPORT_SYMBOL(dev_remove_pack); |
1da177e4 | 387 | |
62532da9 VY |
388 | |
389 | /** | |
390 | * dev_add_offload - register offload handlers | |
391 | * @po: protocol offload declaration | |
392 | * | |
393 | * Add protocol offload handlers to the networking stack. The passed | |
394 | * &proto_offload is linked into kernel lists and may not be freed until | |
395 | * it has been removed from the kernel lists. | |
396 | * | |
397 | * This call does not sleep therefore it can not | |
398 | * guarantee all CPU's that are in middle of receiving packets | |
399 | * will see the new offload handlers (until the next received packet). | |
400 | */ | |
401 | void dev_add_offload(struct packet_offload *po) | |
402 | { | |
bdef7de4 | 403 | struct packet_offload *elem; |
62532da9 VY |
404 | |
405 | spin_lock(&offload_lock); | |
bdef7de4 DM |
406 | list_for_each_entry(elem, &offload_base, list) { |
407 | if (po->priority < elem->priority) | |
408 | break; | |
409 | } | |
410 | list_add_rcu(&po->list, elem->list.prev); | |
62532da9 VY |
411 | spin_unlock(&offload_lock); |
412 | } | |
413 | EXPORT_SYMBOL(dev_add_offload); | |
414 | ||
415 | /** | |
416 | * __dev_remove_offload - remove offload handler | |
417 | * @po: packet offload declaration | |
418 | * | |
419 | * Remove a protocol offload handler that was previously added to the | |
420 | * kernel offload handlers by dev_add_offload(). The passed &offload_type | |
421 | * is removed from the kernel lists and can be freed or reused once this | |
422 | * function returns. | |
423 | * | |
424 | * The packet type might still be in use by receivers | |
425 | * and must not be freed until after all the CPU's have gone | |
426 | * through a quiescent state. | |
427 | */ | |
1d143d9f | 428 | static void __dev_remove_offload(struct packet_offload *po) |
62532da9 VY |
429 | { |
430 | struct list_head *head = &offload_base; | |
431 | struct packet_offload *po1; | |
432 | ||
c53aa505 | 433 | spin_lock(&offload_lock); |
62532da9 VY |
434 | |
435 | list_for_each_entry(po1, head, list) { | |
436 | if (po == po1) { | |
437 | list_del_rcu(&po->list); | |
438 | goto out; | |
439 | } | |
440 | } | |
441 | ||
442 | pr_warn("dev_remove_offload: %p not found\n", po); | |
443 | out: | |
c53aa505 | 444 | spin_unlock(&offload_lock); |
62532da9 | 445 | } |
62532da9 VY |
446 | |
447 | /** | |
448 | * dev_remove_offload - remove packet offload handler | |
449 | * @po: packet offload declaration | |
450 | * | |
451 | * Remove a packet offload handler that was previously added to the kernel | |
452 | * offload handlers by dev_add_offload(). The passed &offload_type is | |
453 | * removed from the kernel lists and can be freed or reused once this | |
454 | * function returns. | |
455 | * | |
456 | * This call sleeps to guarantee that no CPU is looking at the packet | |
457 | * type after return. | |
458 | */ | |
459 | void dev_remove_offload(struct packet_offload *po) | |
460 | { | |
461 | __dev_remove_offload(po); | |
462 | ||
463 | synchronize_net(); | |
464 | } | |
465 | EXPORT_SYMBOL(dev_remove_offload); | |
466 | ||
1da177e4 | 467 | /****************************************************************************** |
eb13da1a | 468 | * |
469 | * Device Boot-time Settings Routines | |
470 | * | |
471 | ******************************************************************************/ | |
1da177e4 LT |
472 | |
473 | /* Boot time configuration table */ | |
474 | static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX]; | |
475 | ||
476 | /** | |
477 | * netdev_boot_setup_add - add new setup entry | |
478 | * @name: name of the device | |
479 | * @map: configured settings for the device | |
480 | * | |
481 | * Adds new setup entry to the dev_boot_setup list. The function | |
482 | * returns 0 on error and 1 on success. This is a generic routine to | |
483 | * all netdevices. | |
484 | */ | |
485 | static int netdev_boot_setup_add(char *name, struct ifmap *map) | |
486 | { | |
487 | struct netdev_boot_setup *s; | |
488 | int i; | |
489 | ||
490 | s = dev_boot_setup; | |
491 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) { | |
492 | if (s[i].name[0] == '\0' || s[i].name[0] == ' ') { | |
493 | memset(s[i].name, 0, sizeof(s[i].name)); | |
93b3cff9 | 494 | strlcpy(s[i].name, name, IFNAMSIZ); |
1da177e4 LT |
495 | memcpy(&s[i].map, map, sizeof(s[i].map)); |
496 | break; | |
497 | } | |
498 | } | |
499 | ||
500 | return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1; | |
501 | } | |
502 | ||
503 | /** | |
722c9a0c | 504 | * netdev_boot_setup_check - check boot time settings |
505 | * @dev: the netdevice | |
1da177e4 | 506 | * |
722c9a0c | 507 | * Check boot time settings for the device. |
508 | * The found settings are set for the device to be used | |
509 | * later in the device probing. | |
510 | * Returns 0 if no settings found, 1 if they are. | |
1da177e4 LT |
511 | */ |
512 | int netdev_boot_setup_check(struct net_device *dev) | |
513 | { | |
514 | struct netdev_boot_setup *s = dev_boot_setup; | |
515 | int i; | |
516 | ||
517 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) { | |
518 | if (s[i].name[0] != '\0' && s[i].name[0] != ' ' && | |
93b3cff9 | 519 | !strcmp(dev->name, s[i].name)) { |
722c9a0c | 520 | dev->irq = s[i].map.irq; |
521 | dev->base_addr = s[i].map.base_addr; | |
522 | dev->mem_start = s[i].map.mem_start; | |
523 | dev->mem_end = s[i].map.mem_end; | |
1da177e4 LT |
524 | return 1; |
525 | } | |
526 | } | |
527 | return 0; | |
528 | } | |
d1b19dff | 529 | EXPORT_SYMBOL(netdev_boot_setup_check); |
1da177e4 LT |
530 | |
531 | ||
532 | /** | |
722c9a0c | 533 | * netdev_boot_base - get address from boot time settings |
534 | * @prefix: prefix for network device | |
535 | * @unit: id for network device | |
536 | * | |
537 | * Check boot time settings for the base address of device. | |
538 | * The found settings are set for the device to be used | |
539 | * later in the device probing. | |
540 | * Returns 0 if no settings found. | |
1da177e4 LT |
541 | */ |
542 | unsigned long netdev_boot_base(const char *prefix, int unit) | |
543 | { | |
544 | const struct netdev_boot_setup *s = dev_boot_setup; | |
545 | char name[IFNAMSIZ]; | |
546 | int i; | |
547 | ||
548 | sprintf(name, "%s%d", prefix, unit); | |
549 | ||
550 | /* | |
551 | * If device already registered then return base of 1 | |
552 | * to indicate not to probe for this interface | |
553 | */ | |
881d966b | 554 | if (__dev_get_by_name(&init_net, name)) |
1da177e4 LT |
555 | return 1; |
556 | ||
557 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) | |
558 | if (!strcmp(name, s[i].name)) | |
559 | return s[i].map.base_addr; | |
560 | return 0; | |
561 | } | |
562 | ||
563 | /* | |
564 | * Saves at boot time configured settings for any netdevice. | |
565 | */ | |
566 | int __init netdev_boot_setup(char *str) | |
567 | { | |
568 | int ints[5]; | |
569 | struct ifmap map; | |
570 | ||
571 | str = get_options(str, ARRAY_SIZE(ints), ints); | |
572 | if (!str || !*str) | |
573 | return 0; | |
574 | ||
575 | /* Save settings */ | |
576 | memset(&map, 0, sizeof(map)); | |
577 | if (ints[0] > 0) | |
578 | map.irq = ints[1]; | |
579 | if (ints[0] > 1) | |
580 | map.base_addr = ints[2]; | |
581 | if (ints[0] > 2) | |
582 | map.mem_start = ints[3]; | |
583 | if (ints[0] > 3) | |
584 | map.mem_end = ints[4]; | |
585 | ||
586 | /* Add new entry to the list */ | |
587 | return netdev_boot_setup_add(str, &map); | |
588 | } | |
589 | ||
590 | __setup("netdev=", netdev_boot_setup); | |
591 | ||
592 | /******************************************************************************* | |
eb13da1a | 593 | * |
594 | * Device Interface Subroutines | |
595 | * | |
596 | *******************************************************************************/ | |
1da177e4 | 597 | |
a54acb3a ND |
598 | /** |
599 | * dev_get_iflink - get 'iflink' value of a interface | |
600 | * @dev: targeted interface | |
601 | * | |
602 | * Indicates the ifindex the interface is linked to. | |
603 | * Physical interfaces have the same 'ifindex' and 'iflink' values. | |
604 | */ | |
605 | ||
606 | int dev_get_iflink(const struct net_device *dev) | |
607 | { | |
608 | if (dev->netdev_ops && dev->netdev_ops->ndo_get_iflink) | |
609 | return dev->netdev_ops->ndo_get_iflink(dev); | |
610 | ||
7a66bbc9 | 611 | return dev->ifindex; |
a54acb3a ND |
612 | } |
613 | EXPORT_SYMBOL(dev_get_iflink); | |
614 | ||
fc4099f1 PS |
615 | /** |
616 | * dev_fill_metadata_dst - Retrieve tunnel egress information. | |
617 | * @dev: targeted interface | |
618 | * @skb: The packet. | |
619 | * | |
620 | * For better visibility of tunnel traffic OVS needs to retrieve | |
621 | * egress tunnel information for a packet. Following API allows | |
622 | * user to get this info. | |
623 | */ | |
624 | int dev_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) | |
625 | { | |
626 | struct ip_tunnel_info *info; | |
627 | ||
628 | if (!dev->netdev_ops || !dev->netdev_ops->ndo_fill_metadata_dst) | |
629 | return -EINVAL; | |
630 | ||
631 | info = skb_tunnel_info_unclone(skb); | |
632 | if (!info) | |
633 | return -ENOMEM; | |
634 | if (unlikely(!(info->mode & IP_TUNNEL_INFO_TX))) | |
635 | return -EINVAL; | |
636 | ||
637 | return dev->netdev_ops->ndo_fill_metadata_dst(dev, skb); | |
638 | } | |
639 | EXPORT_SYMBOL_GPL(dev_fill_metadata_dst); | |
640 | ||
1da177e4 LT |
641 | /** |
642 | * __dev_get_by_name - find a device by its name | |
c4ea43c5 | 643 | * @net: the applicable net namespace |
1da177e4 LT |
644 | * @name: name to find |
645 | * | |
646 | * Find an interface by name. Must be called under RTNL semaphore | |
647 | * or @dev_base_lock. If the name is found a pointer to the device | |
648 | * is returned. If the name is not found then %NULL is returned. The | |
649 | * reference counters are not incremented so the caller must be | |
650 | * careful with locks. | |
651 | */ | |
652 | ||
881d966b | 653 | struct net_device *__dev_get_by_name(struct net *net, const char *name) |
1da177e4 | 654 | { |
0bd8d536 ED |
655 | struct net_device *dev; |
656 | struct hlist_head *head = dev_name_hash(net, name); | |
1da177e4 | 657 | |
b67bfe0d | 658 | hlist_for_each_entry(dev, head, name_hlist) |
1da177e4 LT |
659 | if (!strncmp(dev->name, name, IFNAMSIZ)) |
660 | return dev; | |
0bd8d536 | 661 | |
1da177e4 LT |
662 | return NULL; |
663 | } | |
d1b19dff | 664 | EXPORT_SYMBOL(__dev_get_by_name); |
1da177e4 | 665 | |
72c9528b | 666 | /** |
722c9a0c | 667 | * dev_get_by_name_rcu - find a device by its name |
668 | * @net: the applicable net namespace | |
669 | * @name: name to find | |
670 | * | |
671 | * Find an interface by name. | |
672 | * If the name is found a pointer to the device is returned. | |
673 | * If the name is not found then %NULL is returned. | |
674 | * The reference counters are not incremented so the caller must be | |
675 | * careful with locks. The caller must hold RCU lock. | |
72c9528b ED |
676 | */ |
677 | ||
678 | struct net_device *dev_get_by_name_rcu(struct net *net, const char *name) | |
679 | { | |
72c9528b ED |
680 | struct net_device *dev; |
681 | struct hlist_head *head = dev_name_hash(net, name); | |
682 | ||
b67bfe0d | 683 | hlist_for_each_entry_rcu(dev, head, name_hlist) |
72c9528b ED |
684 | if (!strncmp(dev->name, name, IFNAMSIZ)) |
685 | return dev; | |
686 | ||
687 | return NULL; | |
688 | } | |
689 | EXPORT_SYMBOL(dev_get_by_name_rcu); | |
690 | ||
1da177e4 LT |
691 | /** |
692 | * dev_get_by_name - find a device by its name | |
c4ea43c5 | 693 | * @net: the applicable net namespace |
1da177e4 LT |
694 | * @name: name to find |
695 | * | |
696 | * Find an interface by name. This can be called from any | |
697 | * context and does its own locking. The returned handle has | |
698 | * the usage count incremented and the caller must use dev_put() to | |
699 | * release it when it is no longer needed. %NULL is returned if no | |
700 | * matching device is found. | |
701 | */ | |
702 | ||
881d966b | 703 | struct net_device *dev_get_by_name(struct net *net, const char *name) |
1da177e4 LT |
704 | { |
705 | struct net_device *dev; | |
706 | ||
72c9528b ED |
707 | rcu_read_lock(); |
708 | dev = dev_get_by_name_rcu(net, name); | |
1da177e4 LT |
709 | if (dev) |
710 | dev_hold(dev); | |
72c9528b | 711 | rcu_read_unlock(); |
1da177e4 LT |
712 | return dev; |
713 | } | |
d1b19dff | 714 | EXPORT_SYMBOL(dev_get_by_name); |
1da177e4 LT |
715 | |
716 | /** | |
717 | * __dev_get_by_index - find a device by its ifindex | |
c4ea43c5 | 718 | * @net: the applicable net namespace |
1da177e4 LT |
719 | * @ifindex: index of device |
720 | * | |
721 | * Search for an interface by index. Returns %NULL if the device | |
722 | * is not found or a pointer to the device. The device has not | |
723 | * had its reference counter increased so the caller must be careful | |
724 | * about locking. The caller must hold either the RTNL semaphore | |
725 | * or @dev_base_lock. | |
726 | */ | |
727 | ||
881d966b | 728 | struct net_device *__dev_get_by_index(struct net *net, int ifindex) |
1da177e4 | 729 | { |
0bd8d536 ED |
730 | struct net_device *dev; |
731 | struct hlist_head *head = dev_index_hash(net, ifindex); | |
1da177e4 | 732 | |
b67bfe0d | 733 | hlist_for_each_entry(dev, head, index_hlist) |
1da177e4 LT |
734 | if (dev->ifindex == ifindex) |
735 | return dev; | |
0bd8d536 | 736 | |
1da177e4 LT |
737 | return NULL; |
738 | } | |
d1b19dff | 739 | EXPORT_SYMBOL(__dev_get_by_index); |
1da177e4 | 740 | |
fb699dfd ED |
741 | /** |
742 | * dev_get_by_index_rcu - find a device by its ifindex | |
743 | * @net: the applicable net namespace | |
744 | * @ifindex: index of device | |
745 | * | |
746 | * Search for an interface by index. Returns %NULL if the device | |
747 | * is not found or a pointer to the device. The device has not | |
748 | * had its reference counter increased so the caller must be careful | |
749 | * about locking. The caller must hold RCU lock. | |
750 | */ | |
751 | ||
752 | struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex) | |
753 | { | |
fb699dfd ED |
754 | struct net_device *dev; |
755 | struct hlist_head *head = dev_index_hash(net, ifindex); | |
756 | ||
b67bfe0d | 757 | hlist_for_each_entry_rcu(dev, head, index_hlist) |
fb699dfd ED |
758 | if (dev->ifindex == ifindex) |
759 | return dev; | |
760 | ||
761 | return NULL; | |
762 | } | |
763 | EXPORT_SYMBOL(dev_get_by_index_rcu); | |
764 | ||
1da177e4 LT |
765 | |
766 | /** | |
767 | * dev_get_by_index - find a device by its ifindex | |
c4ea43c5 | 768 | * @net: the applicable net namespace |
1da177e4 LT |
769 | * @ifindex: index of device |
770 | * | |
771 | * Search for an interface by index. Returns NULL if the device | |
772 | * is not found or a pointer to the device. The device returned has | |
773 | * had a reference added and the pointer is safe until the user calls | |
774 | * dev_put to indicate they have finished with it. | |
775 | */ | |
776 | ||
881d966b | 777 | struct net_device *dev_get_by_index(struct net *net, int ifindex) |
1da177e4 LT |
778 | { |
779 | struct net_device *dev; | |
780 | ||
fb699dfd ED |
781 | rcu_read_lock(); |
782 | dev = dev_get_by_index_rcu(net, ifindex); | |
1da177e4 LT |
783 | if (dev) |
784 | dev_hold(dev); | |
fb699dfd | 785 | rcu_read_unlock(); |
1da177e4 LT |
786 | return dev; |
787 | } | |
d1b19dff | 788 | EXPORT_SYMBOL(dev_get_by_index); |
1da177e4 | 789 | |
90b602f8 ML |
790 | /** |
791 | * dev_get_by_napi_id - find a device by napi_id | |
792 | * @napi_id: ID of the NAPI struct | |
793 | * | |
794 | * Search for an interface by NAPI ID. Returns %NULL if the device | |
795 | * is not found or a pointer to the device. The device has not had | |
796 | * its reference counter increased so the caller must be careful | |
797 | * about locking. The caller must hold RCU lock. | |
798 | */ | |
799 | ||
800 | struct net_device *dev_get_by_napi_id(unsigned int napi_id) | |
801 | { | |
802 | struct napi_struct *napi; | |
803 | ||
804 | WARN_ON_ONCE(!rcu_read_lock_held()); | |
805 | ||
806 | if (napi_id < MIN_NAPI_ID) | |
807 | return NULL; | |
808 | ||
809 | napi = napi_by_id(napi_id); | |
810 | ||
811 | return napi ? napi->dev : NULL; | |
812 | } | |
813 | EXPORT_SYMBOL(dev_get_by_napi_id); | |
814 | ||
5dbe7c17 NS |
815 | /** |
816 | * netdev_get_name - get a netdevice name, knowing its ifindex. | |
817 | * @net: network namespace | |
818 | * @name: a pointer to the buffer where the name will be stored. | |
819 | * @ifindex: the ifindex of the interface to get the name from. | |
5dbe7c17 NS |
820 | */ |
821 | int netdev_get_name(struct net *net, char *name, int ifindex) | |
822 | { | |
823 | struct net_device *dev; | |
4f3da95d | 824 | int ret; |
5dbe7c17 | 825 | |
4f3da95d | 826 | down_read(&devnet_rename_sem); |
5dbe7c17 | 827 | rcu_read_lock(); |
4f3da95d | 828 | |
5dbe7c17 NS |
829 | dev = dev_get_by_index_rcu(net, ifindex); |
830 | if (!dev) { | |
4f3da95d AD |
831 | ret = -ENODEV; |
832 | goto out; | |
5dbe7c17 NS |
833 | } |
834 | ||
835 | strcpy(name, dev->name); | |
5dbe7c17 | 836 | |
4f3da95d AD |
837 | ret = 0; |
838 | out: | |
839 | rcu_read_unlock(); | |
840 | up_read(&devnet_rename_sem); | |
841 | return ret; | |
5dbe7c17 NS |
842 | } |
843 | ||
1da177e4 | 844 | /** |
941666c2 | 845 | * dev_getbyhwaddr_rcu - find a device by its hardware address |
c4ea43c5 | 846 | * @net: the applicable net namespace |
1da177e4 LT |
847 | * @type: media type of device |
848 | * @ha: hardware address | |
849 | * | |
850 | * Search for an interface by MAC address. Returns NULL if the device | |
c506653d ED |
851 | * is not found or a pointer to the device. |
852 | * The caller must hold RCU or RTNL. | |
941666c2 | 853 | * The returned device has not had its ref count increased |
1da177e4 LT |
854 | * and the caller must therefore be careful about locking |
855 | * | |
1da177e4 LT |
856 | */ |
857 | ||
941666c2 ED |
858 | struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type, |
859 | const char *ha) | |
1da177e4 LT |
860 | { |
861 | struct net_device *dev; | |
862 | ||
941666c2 | 863 | for_each_netdev_rcu(net, dev) |
1da177e4 LT |
864 | if (dev->type == type && |
865 | !memcmp(dev->dev_addr, ha, dev->addr_len)) | |
7562f876 PE |
866 | return dev; |
867 | ||
868 | return NULL; | |
1da177e4 | 869 | } |
941666c2 | 870 | EXPORT_SYMBOL(dev_getbyhwaddr_rcu); |
cf309e3f | 871 | |
881d966b | 872 | struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type) |
1da177e4 LT |
873 | { |
874 | struct net_device *dev; | |
875 | ||
4e9cac2b | 876 | ASSERT_RTNL(); |
881d966b | 877 | for_each_netdev(net, dev) |
4e9cac2b | 878 | if (dev->type == type) |
7562f876 PE |
879 | return dev; |
880 | ||
881 | return NULL; | |
4e9cac2b | 882 | } |
4e9cac2b PM |
883 | EXPORT_SYMBOL(__dev_getfirstbyhwtype); |
884 | ||
881d966b | 885 | struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type) |
4e9cac2b | 886 | { |
99fe3c39 | 887 | struct net_device *dev, *ret = NULL; |
4e9cac2b | 888 | |
99fe3c39 ED |
889 | rcu_read_lock(); |
890 | for_each_netdev_rcu(net, dev) | |
891 | if (dev->type == type) { | |
892 | dev_hold(dev); | |
893 | ret = dev; | |
894 | break; | |
895 | } | |
896 | rcu_read_unlock(); | |
897 | return ret; | |
1da177e4 | 898 | } |
1da177e4 LT |
899 | EXPORT_SYMBOL(dev_getfirstbyhwtype); |
900 | ||
901 | /** | |
6c555490 | 902 | * __dev_get_by_flags - find any device with given flags |
c4ea43c5 | 903 | * @net: the applicable net namespace |
1da177e4 LT |
904 | * @if_flags: IFF_* values |
905 | * @mask: bitmask of bits in if_flags to check | |
906 | * | |
907 | * Search for any interface with the given flags. Returns NULL if a device | |
bb69ae04 | 908 | * is not found or a pointer to the device. Must be called inside |
6c555490 | 909 | * rtnl_lock(), and result refcount is unchanged. |
1da177e4 LT |
910 | */ |
911 | ||
6c555490 WC |
912 | struct net_device *__dev_get_by_flags(struct net *net, unsigned short if_flags, |
913 | unsigned short mask) | |
1da177e4 | 914 | { |
7562f876 | 915 | struct net_device *dev, *ret; |
1da177e4 | 916 | |
6c555490 WC |
917 | ASSERT_RTNL(); |
918 | ||
7562f876 | 919 | ret = NULL; |
6c555490 | 920 | for_each_netdev(net, dev) { |
1da177e4 | 921 | if (((dev->flags ^ if_flags) & mask) == 0) { |
7562f876 | 922 | ret = dev; |
1da177e4 LT |
923 | break; |
924 | } | |
925 | } | |
7562f876 | 926 | return ret; |
1da177e4 | 927 | } |
6c555490 | 928 | EXPORT_SYMBOL(__dev_get_by_flags); |
1da177e4 LT |
929 | |
930 | /** | |
931 | * dev_valid_name - check if name is okay for network device | |
932 | * @name: name string | |
933 | * | |
934 | * Network device names need to be valid file names to | |
c7fa9d18 DM |
935 | * to allow sysfs to work. We also disallow any kind of |
936 | * whitespace. | |
1da177e4 | 937 | */ |
95f050bf | 938 | bool dev_valid_name(const char *name) |
1da177e4 | 939 | { |
c7fa9d18 | 940 | if (*name == '\0') |
95f050bf | 941 | return false; |
a9d48205 | 942 | if (strnlen(name, IFNAMSIZ) == IFNAMSIZ) |
95f050bf | 943 | return false; |
c7fa9d18 | 944 | if (!strcmp(name, ".") || !strcmp(name, "..")) |
95f050bf | 945 | return false; |
c7fa9d18 DM |
946 | |
947 | while (*name) { | |
a4176a93 | 948 | if (*name == '/' || *name == ':' || isspace(*name)) |
95f050bf | 949 | return false; |
c7fa9d18 DM |
950 | name++; |
951 | } | |
95f050bf | 952 | return true; |
1da177e4 | 953 | } |
d1b19dff | 954 | EXPORT_SYMBOL(dev_valid_name); |
1da177e4 LT |
955 | |
956 | /** | |
b267b179 EB |
957 | * __dev_alloc_name - allocate a name for a device |
958 | * @net: network namespace to allocate the device name in | |
1da177e4 | 959 | * @name: name format string |
b267b179 | 960 | * @buf: scratch buffer and result name string |
1da177e4 LT |
961 | * |
962 | * Passed a format string - eg "lt%d" it will try and find a suitable | |
3041a069 SH |
963 | * id. It scans list of devices to build up a free map, then chooses |
964 | * the first empty slot. The caller must hold the dev_base or rtnl lock | |
965 | * while allocating the name and adding the device in order to avoid | |
966 | * duplicates. | |
967 | * Limited to bits_per_byte * page size devices (ie 32K on most platforms). | |
968 | * Returns the number of the unit assigned or a negative errno code. | |
1da177e4 LT |
969 | */ |
970 | ||
b267b179 | 971 | static int __dev_alloc_name(struct net *net, const char *name, char *buf) |
1da177e4 LT |
972 | { |
973 | int i = 0; | |
1da177e4 LT |
974 | const char *p; |
975 | const int max_netdevices = 8*PAGE_SIZE; | |
cfcabdcc | 976 | unsigned long *inuse; |
1da177e4 LT |
977 | struct net_device *d; |
978 | ||
93809105 RV |
979 | if (!dev_valid_name(name)) |
980 | return -EINVAL; | |
981 | ||
51f299dd | 982 | p = strchr(name, '%'); |
1da177e4 LT |
983 | if (p) { |
984 | /* | |
985 | * Verify the string as this thing may have come from | |
986 | * the user. There must be either one "%d" and no other "%" | |
987 | * characters. | |
988 | */ | |
989 | if (p[1] != 'd' || strchr(p + 2, '%')) | |
990 | return -EINVAL; | |
991 | ||
992 | /* Use one page as a bit array of possible slots */ | |
cfcabdcc | 993 | inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC); |
1da177e4 LT |
994 | if (!inuse) |
995 | return -ENOMEM; | |
996 | ||
881d966b | 997 | for_each_netdev(net, d) { |
1da177e4 LT |
998 | if (!sscanf(d->name, name, &i)) |
999 | continue; | |
1000 | if (i < 0 || i >= max_netdevices) | |
1001 | continue; | |
1002 | ||
1003 | /* avoid cases where sscanf is not exact inverse of printf */ | |
b267b179 | 1004 | snprintf(buf, IFNAMSIZ, name, i); |
1da177e4 LT |
1005 | if (!strncmp(buf, d->name, IFNAMSIZ)) |
1006 | set_bit(i, inuse); | |
1007 | } | |
1008 | ||
1009 | i = find_first_zero_bit(inuse, max_netdevices); | |
1010 | free_page((unsigned long) inuse); | |
1011 | } | |
1012 | ||
6224abda | 1013 | snprintf(buf, IFNAMSIZ, name, i); |
b267b179 | 1014 | if (!__dev_get_by_name(net, buf)) |
1da177e4 | 1015 | return i; |
1da177e4 LT |
1016 | |
1017 | /* It is possible to run out of possible slots | |
1018 | * when the name is long and there isn't enough space left | |
1019 | * for the digits, or if all bits are used. | |
1020 | */ | |
029b6d14 | 1021 | return -ENFILE; |
1da177e4 LT |
1022 | } |
1023 | ||
2c88b855 RV |
1024 | static int dev_alloc_name_ns(struct net *net, |
1025 | struct net_device *dev, | |
1026 | const char *name) | |
1027 | { | |
1028 | char buf[IFNAMSIZ]; | |
1029 | int ret; | |
1030 | ||
c46d7642 | 1031 | BUG_ON(!net); |
2c88b855 RV |
1032 | ret = __dev_alloc_name(net, name, buf); |
1033 | if (ret >= 0) | |
1034 | strlcpy(dev->name, buf, IFNAMSIZ); | |
1035 | return ret; | |
1da177e4 LT |
1036 | } |
1037 | ||
b267b179 EB |
1038 | /** |
1039 | * dev_alloc_name - allocate a name for a device | |
1040 | * @dev: device | |
1041 | * @name: name format string | |
1042 | * | |
1043 | * Passed a format string - eg "lt%d" it will try and find a suitable | |
1044 | * id. It scans list of devices to build up a free map, then chooses | |
1045 | * the first empty slot. The caller must hold the dev_base or rtnl lock | |
1046 | * while allocating the name and adding the device in order to avoid | |
1047 | * duplicates. | |
1048 | * Limited to bits_per_byte * page size devices (ie 32K on most platforms). | |
1049 | * Returns the number of the unit assigned or a negative errno code. | |
1050 | */ | |
1051 | ||
1052 | int dev_alloc_name(struct net_device *dev, const char *name) | |
1053 | { | |
c46d7642 | 1054 | return dev_alloc_name_ns(dev_net(dev), dev, name); |
b267b179 | 1055 | } |
d1b19dff | 1056 | EXPORT_SYMBOL(dev_alloc_name); |
b267b179 | 1057 | |
0ad646c8 CW |
1058 | int dev_get_valid_name(struct net *net, struct net_device *dev, |
1059 | const char *name) | |
828de4f6 | 1060 | { |
55a5ec9b DM |
1061 | BUG_ON(!net); |
1062 | ||
1063 | if (!dev_valid_name(name)) | |
1064 | return -EINVAL; | |
1065 | ||
1066 | if (strchr(name, '%')) | |
1067 | return dev_alloc_name_ns(net, dev, name); | |
1068 | else if (__dev_get_by_name(net, name)) | |
1069 | return -EEXIST; | |
1070 | else if (dev->name != name) | |
1071 | strlcpy(dev->name, name, IFNAMSIZ); | |
1072 | ||
1073 | return 0; | |
d9031024 | 1074 | } |
0ad646c8 | 1075 | EXPORT_SYMBOL(dev_get_valid_name); |
1da177e4 LT |
1076 | |
1077 | /** | |
1078 | * dev_change_name - change name of a device | |
1079 | * @dev: device | |
1080 | * @newname: name (or format string) must be at least IFNAMSIZ | |
1081 | * | |
1082 | * Change name of a device, can pass format strings "eth%d". | |
1083 | * for wildcarding. | |
1084 | */ | |
cf04a4c7 | 1085 | int dev_change_name(struct net_device *dev, const char *newname) |
1da177e4 | 1086 | { |
238fa362 | 1087 | unsigned char old_assign_type; |
fcc5a03a | 1088 | char oldname[IFNAMSIZ]; |
1da177e4 | 1089 | int err = 0; |
fcc5a03a | 1090 | int ret; |
881d966b | 1091 | struct net *net; |
1da177e4 LT |
1092 | |
1093 | ASSERT_RTNL(); | |
c346dca1 | 1094 | BUG_ON(!dev_net(dev)); |
1da177e4 | 1095 | |
c346dca1 | 1096 | net = dev_net(dev); |
8065a779 SWL |
1097 | |
1098 | /* Some auto-enslaved devices e.g. failover slaves are | |
1099 | * special, as userspace might rename the device after | |
1100 | * the interface had been brought up and running since | |
1101 | * the point kernel initiated auto-enslavement. Allow | |
1102 | * live name change even when these slave devices are | |
1103 | * up and running. | |
1104 | * | |
1105 | * Typically, users of these auto-enslaving devices | |
1106 | * don't actually care about slave name change, as | |
1107 | * they are supposed to operate on master interface | |
1108 | * directly. | |
1109 | */ | |
1110 | if (dev->flags & IFF_UP && | |
1111 | likely(!(dev->priv_flags & IFF_LIVE_RENAME_OK))) | |
1da177e4 LT |
1112 | return -EBUSY; |
1113 | ||
4f3da95d | 1114 | down_write(&devnet_rename_sem); |
c91f6df2 BH |
1115 | |
1116 | if (strncmp(newname, dev->name, IFNAMSIZ) == 0) { | |
4f3da95d | 1117 | up_write(&devnet_rename_sem); |
c8d90dca | 1118 | return 0; |
c91f6df2 | 1119 | } |
c8d90dca | 1120 | |
fcc5a03a HX |
1121 | memcpy(oldname, dev->name, IFNAMSIZ); |
1122 | ||
828de4f6 | 1123 | err = dev_get_valid_name(net, dev, newname); |
c91f6df2 | 1124 | if (err < 0) { |
4f3da95d | 1125 | up_write(&devnet_rename_sem); |
d9031024 | 1126 | return err; |
c91f6df2 | 1127 | } |
1da177e4 | 1128 | |
6fe82a39 VF |
1129 | if (oldname[0] && !strchr(oldname, '%')) |
1130 | netdev_info(dev, "renamed from %s\n", oldname); | |
1131 | ||
238fa362 TG |
1132 | old_assign_type = dev->name_assign_type; |
1133 | dev->name_assign_type = NET_NAME_RENAMED; | |
1134 | ||
fcc5a03a | 1135 | rollback: |
a1b3f594 EB |
1136 | ret = device_rename(&dev->dev, dev->name); |
1137 | if (ret) { | |
1138 | memcpy(dev->name, oldname, IFNAMSIZ); | |
238fa362 | 1139 | dev->name_assign_type = old_assign_type; |
4f3da95d | 1140 | up_write(&devnet_rename_sem); |
a1b3f594 | 1141 | return ret; |
dcc99773 | 1142 | } |
7f988eab | 1143 | |
4f3da95d | 1144 | up_write(&devnet_rename_sem); |
c91f6df2 | 1145 | |
5bb025fa VF |
1146 | netdev_adjacent_rename_links(dev, oldname); |
1147 | ||
7f988eab | 1148 | write_lock_bh(&dev_base_lock); |
372b2312 | 1149 | hlist_del_rcu(&dev->name_hlist); |
72c9528b ED |
1150 | write_unlock_bh(&dev_base_lock); |
1151 | ||
1152 | synchronize_rcu(); | |
1153 | ||
1154 | write_lock_bh(&dev_base_lock); | |
1155 | hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name)); | |
7f988eab HX |
1156 | write_unlock_bh(&dev_base_lock); |
1157 | ||
056925ab | 1158 | ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev); |
fcc5a03a HX |
1159 | ret = notifier_to_errno(ret); |
1160 | ||
1161 | if (ret) { | |
91e9c07b ED |
1162 | /* err >= 0 after dev_alloc_name() or stores the first errno */ |
1163 | if (err >= 0) { | |
fcc5a03a | 1164 | err = ret; |
4f3da95d | 1165 | down_write(&devnet_rename_sem); |
fcc5a03a | 1166 | memcpy(dev->name, oldname, IFNAMSIZ); |
5bb025fa | 1167 | memcpy(oldname, newname, IFNAMSIZ); |
238fa362 TG |
1168 | dev->name_assign_type = old_assign_type; |
1169 | old_assign_type = NET_NAME_RENAMED; | |
fcc5a03a | 1170 | goto rollback; |
91e9c07b | 1171 | } else { |
7b6cd1ce | 1172 | pr_err("%s: name change rollback failed: %d\n", |
91e9c07b | 1173 | dev->name, ret); |
fcc5a03a HX |
1174 | } |
1175 | } | |
1da177e4 LT |
1176 | |
1177 | return err; | |
1178 | } | |
1179 | ||
0b815a1a SH |
1180 | /** |
1181 | * dev_set_alias - change ifalias of a device | |
1182 | * @dev: device | |
1183 | * @alias: name up to IFALIASZ | |
f0db275a | 1184 | * @len: limit of bytes to copy from info |
0b815a1a SH |
1185 | * |
1186 | * Set ifalias for a device, | |
1187 | */ | |
1188 | int dev_set_alias(struct net_device *dev, const char *alias, size_t len) | |
1189 | { | |
6c557001 | 1190 | struct dev_ifalias *new_alias = NULL; |
0b815a1a SH |
1191 | |
1192 | if (len >= IFALIASZ) | |
1193 | return -EINVAL; | |
1194 | ||
6c557001 FW |
1195 | if (len) { |
1196 | new_alias = kmalloc(sizeof(*new_alias) + len + 1, GFP_KERNEL); | |
1197 | if (!new_alias) | |
1198 | return -ENOMEM; | |
1199 | ||
1200 | memcpy(new_alias->ifalias, alias, len); | |
1201 | new_alias->ifalias[len] = 0; | |
96ca4a2c OH |
1202 | } |
1203 | ||
6c557001 FW |
1204 | mutex_lock(&ifalias_mutex); |
1205 | rcu_swap_protected(dev->ifalias, new_alias, | |
1206 | mutex_is_locked(&ifalias_mutex)); | |
1207 | mutex_unlock(&ifalias_mutex); | |
1208 | ||
1209 | if (new_alias) | |
1210 | kfree_rcu(new_alias, rcuhead); | |
0b815a1a | 1211 | |
0b815a1a SH |
1212 | return len; |
1213 | } | |
0fe554a4 | 1214 | EXPORT_SYMBOL(dev_set_alias); |
0b815a1a | 1215 | |
6c557001 FW |
1216 | /** |
1217 | * dev_get_alias - get ifalias of a device | |
1218 | * @dev: device | |
20e88320 | 1219 | * @name: buffer to store name of ifalias |
6c557001 FW |
1220 | * @len: size of buffer |
1221 | * | |
1222 | * get ifalias for a device. Caller must make sure dev cannot go | |
1223 | * away, e.g. rcu read lock or own a reference count to device. | |
1224 | */ | |
1225 | int dev_get_alias(const struct net_device *dev, char *name, size_t len) | |
1226 | { | |
1227 | const struct dev_ifalias *alias; | |
1228 | int ret = 0; | |
1229 | ||
1230 | rcu_read_lock(); | |
1231 | alias = rcu_dereference(dev->ifalias); | |
1232 | if (alias) | |
1233 | ret = snprintf(name, len, "%s", alias->ifalias); | |
1234 | rcu_read_unlock(); | |
1235 | ||
1236 | return ret; | |
1237 | } | |
0b815a1a | 1238 | |
d8a33ac4 | 1239 | /** |
3041a069 | 1240 | * netdev_features_change - device changes features |
d8a33ac4 SH |
1241 | * @dev: device to cause notification |
1242 | * | |
1243 | * Called to indicate a device has changed features. | |
1244 | */ | |
1245 | void netdev_features_change(struct net_device *dev) | |
1246 | { | |
056925ab | 1247 | call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev); |
d8a33ac4 SH |
1248 | } |
1249 | EXPORT_SYMBOL(netdev_features_change); | |
1250 | ||
1da177e4 LT |
1251 | /** |
1252 | * netdev_state_change - device changes state | |
1253 | * @dev: device to cause notification | |
1254 | * | |
1255 | * Called to indicate a device has changed state. This function calls | |
1256 | * the notifier chains for netdev_chain and sends a NEWLINK message | |
1257 | * to the routing socket. | |
1258 | */ | |
1259 | void netdev_state_change(struct net_device *dev) | |
1260 | { | |
1261 | if (dev->flags & IFF_UP) { | |
51d0c047 DA |
1262 | struct netdev_notifier_change_info change_info = { |
1263 | .info.dev = dev, | |
1264 | }; | |
54951194 | 1265 | |
51d0c047 | 1266 | call_netdevice_notifiers_info(NETDEV_CHANGE, |
54951194 | 1267 | &change_info.info); |
7f294054 | 1268 | rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL); |
1da177e4 LT |
1269 | } |
1270 | } | |
d1b19dff | 1271 | EXPORT_SYMBOL(netdev_state_change); |
1da177e4 | 1272 | |
ee89bab1 | 1273 | /** |
722c9a0c | 1274 | * netdev_notify_peers - notify network peers about existence of @dev |
1275 | * @dev: network device | |
ee89bab1 AW |
1276 | * |
1277 | * Generate traffic such that interested network peers are aware of | |
1278 | * @dev, such as by generating a gratuitous ARP. This may be used when | |
1279 | * a device wants to inform the rest of the network about some sort of | |
1280 | * reconfiguration such as a failover event or virtual machine | |
1281 | * migration. | |
1282 | */ | |
1283 | void netdev_notify_peers(struct net_device *dev) | |
c1da4ac7 | 1284 | { |
ee89bab1 AW |
1285 | rtnl_lock(); |
1286 | call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, dev); | |
37c343b4 | 1287 | call_netdevice_notifiers(NETDEV_RESEND_IGMP, dev); |
ee89bab1 | 1288 | rtnl_unlock(); |
c1da4ac7 | 1289 | } |
ee89bab1 | 1290 | EXPORT_SYMBOL(netdev_notify_peers); |
c1da4ac7 | 1291 | |
40c900aa | 1292 | static int __dev_open(struct net_device *dev, struct netlink_ext_ack *extack) |
1da177e4 | 1293 | { |
d314774c | 1294 | const struct net_device_ops *ops = dev->netdev_ops; |
3b8bcfd5 | 1295 | int ret; |
1da177e4 | 1296 | |
e46b66bc BH |
1297 | ASSERT_RTNL(); |
1298 | ||
1da177e4 LT |
1299 | if (!netif_device_present(dev)) |
1300 | return -ENODEV; | |
1301 | ||
ca99ca14 NH |
1302 | /* Block netpoll from trying to do any rx path servicing. |
1303 | * If we don't do this there is a chance ndo_poll_controller | |
1304 | * or ndo_poll may be running while we open the device | |
1305 | */ | |
66b5552f | 1306 | netpoll_poll_disable(dev); |
ca99ca14 | 1307 | |
40c900aa | 1308 | ret = call_netdevice_notifiers_extack(NETDEV_PRE_UP, dev, extack); |
3b8bcfd5 JB |
1309 | ret = notifier_to_errno(ret); |
1310 | if (ret) | |
1311 | return ret; | |
1312 | ||
1da177e4 | 1313 | set_bit(__LINK_STATE_START, &dev->state); |
bada339b | 1314 | |
d314774c SH |
1315 | if (ops->ndo_validate_addr) |
1316 | ret = ops->ndo_validate_addr(dev); | |
bada339b | 1317 | |
d314774c SH |
1318 | if (!ret && ops->ndo_open) |
1319 | ret = ops->ndo_open(dev); | |
1da177e4 | 1320 | |
66b5552f | 1321 | netpoll_poll_enable(dev); |
ca99ca14 | 1322 | |
bada339b JG |
1323 | if (ret) |
1324 | clear_bit(__LINK_STATE_START, &dev->state); | |
1325 | else { | |
1da177e4 | 1326 | dev->flags |= IFF_UP; |
4417da66 | 1327 | dev_set_rx_mode(dev); |
1da177e4 | 1328 | dev_activate(dev); |
7bf23575 | 1329 | add_device_randomness(dev->dev_addr, dev->addr_len); |
1da177e4 | 1330 | } |
bada339b | 1331 | |
1da177e4 LT |
1332 | return ret; |
1333 | } | |
1334 | ||
1335 | /** | |
bd380811 | 1336 | * dev_open - prepare an interface for use. |
00f54e68 PM |
1337 | * @dev: device to open |
1338 | * @extack: netlink extended ack | |
1da177e4 | 1339 | * |
bd380811 PM |
1340 | * Takes a device from down to up state. The device's private open |
1341 | * function is invoked and then the multicast lists are loaded. Finally | |
1342 | * the device is moved into the up state and a %NETDEV_UP message is | |
1343 | * sent to the netdev notifier chain. | |
1344 | * | |
1345 | * Calling this function on an active interface is a nop. On a failure | |
1346 | * a negative errno code is returned. | |
1da177e4 | 1347 | */ |
00f54e68 | 1348 | int dev_open(struct net_device *dev, struct netlink_ext_ack *extack) |
bd380811 PM |
1349 | { |
1350 | int ret; | |
1351 | ||
bd380811 PM |
1352 | if (dev->flags & IFF_UP) |
1353 | return 0; | |
1354 | ||
40c900aa | 1355 | ret = __dev_open(dev, extack); |
bd380811 PM |
1356 | if (ret < 0) |
1357 | return ret; | |
1358 | ||
7f294054 | 1359 | rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING, GFP_KERNEL); |
bd380811 PM |
1360 | call_netdevice_notifiers(NETDEV_UP, dev); |
1361 | ||
1362 | return ret; | |
1363 | } | |
1364 | EXPORT_SYMBOL(dev_open); | |
1365 | ||
7051b88a | 1366 | static void __dev_close_many(struct list_head *head) |
1da177e4 | 1367 | { |
44345724 | 1368 | struct net_device *dev; |
e46b66bc | 1369 | |
bd380811 | 1370 | ASSERT_RTNL(); |
9d5010db DM |
1371 | might_sleep(); |
1372 | ||
5cde2829 | 1373 | list_for_each_entry(dev, head, close_list) { |
3f4df206 | 1374 | /* Temporarily disable netpoll until the interface is down */ |
66b5552f | 1375 | netpoll_poll_disable(dev); |
3f4df206 | 1376 | |
44345724 | 1377 | call_netdevice_notifiers(NETDEV_GOING_DOWN, dev); |
1da177e4 | 1378 | |
44345724 | 1379 | clear_bit(__LINK_STATE_START, &dev->state); |
1da177e4 | 1380 | |
44345724 OP |
1381 | /* Synchronize to scheduled poll. We cannot touch poll list, it |
1382 | * can be even on different cpu. So just clear netif_running(). | |
1383 | * | |
1384 | * dev->stop() will invoke napi_disable() on all of it's | |
1385 | * napi_struct instances on this device. | |
1386 | */ | |
4e857c58 | 1387 | smp_mb__after_atomic(); /* Commit netif_running(). */ |
44345724 | 1388 | } |
1da177e4 | 1389 | |
44345724 | 1390 | dev_deactivate_many(head); |
d8b2a4d2 | 1391 | |
5cde2829 | 1392 | list_for_each_entry(dev, head, close_list) { |
44345724 | 1393 | const struct net_device_ops *ops = dev->netdev_ops; |
1da177e4 | 1394 | |
44345724 OP |
1395 | /* |
1396 | * Call the device specific close. This cannot fail. | |
1397 | * Only if device is UP | |
1398 | * | |
1399 | * We allow it to be called even after a DETACH hot-plug | |
1400 | * event. | |
1401 | */ | |
1402 | if (ops->ndo_stop) | |
1403 | ops->ndo_stop(dev); | |
1404 | ||
44345724 | 1405 | dev->flags &= ~IFF_UP; |
66b5552f | 1406 | netpoll_poll_enable(dev); |
44345724 | 1407 | } |
44345724 OP |
1408 | } |
1409 | ||
7051b88a | 1410 | static void __dev_close(struct net_device *dev) |
44345724 OP |
1411 | { |
1412 | LIST_HEAD(single); | |
1413 | ||
5cde2829 | 1414 | list_add(&dev->close_list, &single); |
7051b88a | 1415 | __dev_close_many(&single); |
f87e6f47 | 1416 | list_del(&single); |
44345724 OP |
1417 | } |
1418 | ||
7051b88a | 1419 | void dev_close_many(struct list_head *head, bool unlink) |
44345724 OP |
1420 | { |
1421 | struct net_device *dev, *tmp; | |
1da177e4 | 1422 | |
5cde2829 EB |
1423 | /* Remove the devices that don't need to be closed */ |
1424 | list_for_each_entry_safe(dev, tmp, head, close_list) | |
44345724 | 1425 | if (!(dev->flags & IFF_UP)) |
5cde2829 | 1426 | list_del_init(&dev->close_list); |
44345724 OP |
1427 | |
1428 | __dev_close_many(head); | |
1da177e4 | 1429 | |
5cde2829 | 1430 | list_for_each_entry_safe(dev, tmp, head, close_list) { |
7f294054 | 1431 | rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING, GFP_KERNEL); |
44345724 | 1432 | call_netdevice_notifiers(NETDEV_DOWN, dev); |
99c4a26a DM |
1433 | if (unlink) |
1434 | list_del_init(&dev->close_list); | |
44345724 | 1435 | } |
bd380811 | 1436 | } |
99c4a26a | 1437 | EXPORT_SYMBOL(dev_close_many); |
bd380811 PM |
1438 | |
1439 | /** | |
1440 | * dev_close - shutdown an interface. | |
1441 | * @dev: device to shutdown | |
1442 | * | |
1443 | * This function moves an active device into down state. A | |
1444 | * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device | |
1445 | * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier | |
1446 | * chain. | |
1447 | */ | |
7051b88a | 1448 | void dev_close(struct net_device *dev) |
bd380811 | 1449 | { |
e14a5993 ED |
1450 | if (dev->flags & IFF_UP) { |
1451 | LIST_HEAD(single); | |
1da177e4 | 1452 | |
5cde2829 | 1453 | list_add(&dev->close_list, &single); |
99c4a26a | 1454 | dev_close_many(&single, true); |
e14a5993 ED |
1455 | list_del(&single); |
1456 | } | |
1da177e4 | 1457 | } |
d1b19dff | 1458 | EXPORT_SYMBOL(dev_close); |
1da177e4 LT |
1459 | |
1460 | ||
0187bdfb BH |
1461 | /** |
1462 | * dev_disable_lro - disable Large Receive Offload on a device | |
1463 | * @dev: device | |
1464 | * | |
1465 | * Disable Large Receive Offload (LRO) on a net device. Must be | |
1466 | * called under RTNL. This is needed if received packets may be | |
1467 | * forwarded to another interface. | |
1468 | */ | |
1469 | void dev_disable_lro(struct net_device *dev) | |
1470 | { | |
fbe168ba MK |
1471 | struct net_device *lower_dev; |
1472 | struct list_head *iter; | |
529d0489 | 1473 | |
bc5787c6 MM |
1474 | dev->wanted_features &= ~NETIF_F_LRO; |
1475 | netdev_update_features(dev); | |
27660515 | 1476 | |
22d5969f MM |
1477 | if (unlikely(dev->features & NETIF_F_LRO)) |
1478 | netdev_WARN(dev, "failed to disable LRO!\n"); | |
fbe168ba MK |
1479 | |
1480 | netdev_for_each_lower_dev(dev, lower_dev, iter) | |
1481 | dev_disable_lro(lower_dev); | |
0187bdfb BH |
1482 | } |
1483 | EXPORT_SYMBOL(dev_disable_lro); | |
1484 | ||
56f5aa77 MC |
1485 | /** |
1486 | * dev_disable_gro_hw - disable HW Generic Receive Offload on a device | |
1487 | * @dev: device | |
1488 | * | |
1489 | * Disable HW Generic Receive Offload (GRO_HW) on a net device. Must be | |
1490 | * called under RTNL. This is needed if Generic XDP is installed on | |
1491 | * the device. | |
1492 | */ | |
1493 | static void dev_disable_gro_hw(struct net_device *dev) | |
1494 | { | |
1495 | dev->wanted_features &= ~NETIF_F_GRO_HW; | |
1496 | netdev_update_features(dev); | |
1497 | ||
1498 | if (unlikely(dev->features & NETIF_F_GRO_HW)) | |
1499 | netdev_WARN(dev, "failed to disable GRO_HW!\n"); | |
1500 | } | |
1501 | ||
ede2762d KT |
1502 | const char *netdev_cmd_to_name(enum netdev_cmd cmd) |
1503 | { | |
1504 | #define N(val) \ | |
1505 | case NETDEV_##val: \ | |
1506 | return "NETDEV_" __stringify(val); | |
1507 | switch (cmd) { | |
1508 | N(UP) N(DOWN) N(REBOOT) N(CHANGE) N(REGISTER) N(UNREGISTER) | |
1509 | N(CHANGEMTU) N(CHANGEADDR) N(GOING_DOWN) N(CHANGENAME) N(FEAT_CHANGE) | |
1510 | N(BONDING_FAILOVER) N(PRE_UP) N(PRE_TYPE_CHANGE) N(POST_TYPE_CHANGE) | |
1511 | N(POST_INIT) N(RELEASE) N(NOTIFY_PEERS) N(JOIN) N(CHANGEUPPER) | |
1512 | N(RESEND_IGMP) N(PRECHANGEMTU) N(CHANGEINFODATA) N(BONDING_INFO) | |
1513 | N(PRECHANGEUPPER) N(CHANGELOWERSTATE) N(UDP_TUNNEL_PUSH_INFO) | |
1514 | N(UDP_TUNNEL_DROP_INFO) N(CHANGE_TX_QUEUE_LEN) | |
9daae9bd GP |
1515 | N(CVLAN_FILTER_PUSH_INFO) N(CVLAN_FILTER_DROP_INFO) |
1516 | N(SVLAN_FILTER_PUSH_INFO) N(SVLAN_FILTER_DROP_INFO) | |
1570415f | 1517 | N(PRE_CHANGEADDR) |
3f5ecd8a | 1518 | } |
ede2762d KT |
1519 | #undef N |
1520 | return "UNKNOWN_NETDEV_EVENT"; | |
1521 | } | |
1522 | EXPORT_SYMBOL_GPL(netdev_cmd_to_name); | |
1523 | ||
351638e7 JP |
1524 | static int call_netdevice_notifier(struct notifier_block *nb, unsigned long val, |
1525 | struct net_device *dev) | |
1526 | { | |
51d0c047 DA |
1527 | struct netdev_notifier_info info = { |
1528 | .dev = dev, | |
1529 | }; | |
351638e7 | 1530 | |
351638e7 JP |
1531 | return nb->notifier_call(nb, val, &info); |
1532 | } | |
0187bdfb | 1533 | |
881d966b EB |
1534 | static int dev_boot_phase = 1; |
1535 | ||
1da177e4 | 1536 | /** |
722c9a0c | 1537 | * register_netdevice_notifier - register a network notifier block |
1538 | * @nb: notifier | |
1da177e4 | 1539 | * |
722c9a0c | 1540 | * Register a notifier to be called when network device events occur. |
1541 | * The notifier passed is linked into the kernel structures and must | |
1542 | * not be reused until it has been unregistered. A negative errno code | |
1543 | * is returned on a failure. | |
1da177e4 | 1544 | * |
722c9a0c | 1545 | * When registered all registration and up events are replayed |
1546 | * to the new notifier to allow device to have a race free | |
1547 | * view of the network device list. | |
1da177e4 LT |
1548 | */ |
1549 | ||
1550 | int register_netdevice_notifier(struct notifier_block *nb) | |
1551 | { | |
1552 | struct net_device *dev; | |
fcc5a03a | 1553 | struct net_device *last; |
881d966b | 1554 | struct net *net; |
1da177e4 LT |
1555 | int err; |
1556 | ||
328fbe74 KT |
1557 | /* Close race with setup_net() and cleanup_net() */ |
1558 | down_write(&pernet_ops_rwsem); | |
1da177e4 | 1559 | rtnl_lock(); |
f07d5b94 | 1560 | err = raw_notifier_chain_register(&netdev_chain, nb); |
fcc5a03a HX |
1561 | if (err) |
1562 | goto unlock; | |
881d966b EB |
1563 | if (dev_boot_phase) |
1564 | goto unlock; | |
1565 | for_each_net(net) { | |
1566 | for_each_netdev(net, dev) { | |
351638e7 | 1567 | err = call_netdevice_notifier(nb, NETDEV_REGISTER, dev); |
881d966b EB |
1568 | err = notifier_to_errno(err); |
1569 | if (err) | |
1570 | goto rollback; | |
1571 | ||
1572 | if (!(dev->flags & IFF_UP)) | |
1573 | continue; | |
1da177e4 | 1574 | |
351638e7 | 1575 | call_netdevice_notifier(nb, NETDEV_UP, dev); |
881d966b | 1576 | } |
1da177e4 | 1577 | } |
fcc5a03a HX |
1578 | |
1579 | unlock: | |
1da177e4 | 1580 | rtnl_unlock(); |
328fbe74 | 1581 | up_write(&pernet_ops_rwsem); |
1da177e4 | 1582 | return err; |
fcc5a03a HX |
1583 | |
1584 | rollback: | |
1585 | last = dev; | |
881d966b EB |
1586 | for_each_net(net) { |
1587 | for_each_netdev(net, dev) { | |
1588 | if (dev == last) | |
8f891489 | 1589 | goto outroll; |
fcc5a03a | 1590 | |
881d966b | 1591 | if (dev->flags & IFF_UP) { |
351638e7 JP |
1592 | call_netdevice_notifier(nb, NETDEV_GOING_DOWN, |
1593 | dev); | |
1594 | call_netdevice_notifier(nb, NETDEV_DOWN, dev); | |
881d966b | 1595 | } |
351638e7 | 1596 | call_netdevice_notifier(nb, NETDEV_UNREGISTER, dev); |
fcc5a03a | 1597 | } |
fcc5a03a | 1598 | } |
c67625a1 | 1599 | |
8f891489 | 1600 | outroll: |
c67625a1 | 1601 | raw_notifier_chain_unregister(&netdev_chain, nb); |
fcc5a03a | 1602 | goto unlock; |
1da177e4 | 1603 | } |
d1b19dff | 1604 | EXPORT_SYMBOL(register_netdevice_notifier); |
1da177e4 LT |
1605 | |
1606 | /** | |
722c9a0c | 1607 | * unregister_netdevice_notifier - unregister a network notifier block |
1608 | * @nb: notifier | |
1da177e4 | 1609 | * |
722c9a0c | 1610 | * Unregister a notifier previously registered by |
1611 | * register_netdevice_notifier(). The notifier is unlinked into the | |
1612 | * kernel structures and may then be reused. A negative errno code | |
1613 | * is returned on a failure. | |
7d3d43da | 1614 | * |
722c9a0c | 1615 | * After unregistering unregister and down device events are synthesized |
1616 | * for all devices on the device list to the removed notifier to remove | |
1617 | * the need for special case cleanup code. | |
1da177e4 LT |
1618 | */ |
1619 | ||
1620 | int unregister_netdevice_notifier(struct notifier_block *nb) | |
1621 | { | |
7d3d43da EB |
1622 | struct net_device *dev; |
1623 | struct net *net; | |
9f514950 HX |
1624 | int err; |
1625 | ||
328fbe74 KT |
1626 | /* Close race with setup_net() and cleanup_net() */ |
1627 | down_write(&pernet_ops_rwsem); | |
9f514950 | 1628 | rtnl_lock(); |
f07d5b94 | 1629 | err = raw_notifier_chain_unregister(&netdev_chain, nb); |
7d3d43da EB |
1630 | if (err) |
1631 | goto unlock; | |
1632 | ||
1633 | for_each_net(net) { | |
1634 | for_each_netdev(net, dev) { | |
1635 | if (dev->flags & IFF_UP) { | |
351638e7 JP |
1636 | call_netdevice_notifier(nb, NETDEV_GOING_DOWN, |
1637 | dev); | |
1638 | call_netdevice_notifier(nb, NETDEV_DOWN, dev); | |
7d3d43da | 1639 | } |
351638e7 | 1640 | call_netdevice_notifier(nb, NETDEV_UNREGISTER, dev); |
7d3d43da EB |
1641 | } |
1642 | } | |
1643 | unlock: | |
9f514950 | 1644 | rtnl_unlock(); |
328fbe74 | 1645 | up_write(&pernet_ops_rwsem); |
9f514950 | 1646 | return err; |
1da177e4 | 1647 | } |
d1b19dff | 1648 | EXPORT_SYMBOL(unregister_netdevice_notifier); |
1da177e4 | 1649 | |
351638e7 JP |
1650 | /** |
1651 | * call_netdevice_notifiers_info - call all network notifier blocks | |
1652 | * @val: value passed unmodified to notifier function | |
351638e7 JP |
1653 | * @info: notifier information data |
1654 | * | |
1655 | * Call all network notifier blocks. Parameters and return value | |
1656 | * are as for raw_notifier_call_chain(). | |
1657 | */ | |
1658 | ||
1d143d9f | 1659 | static int call_netdevice_notifiers_info(unsigned long val, |
1d143d9f | 1660 | struct netdev_notifier_info *info) |
351638e7 JP |
1661 | { |
1662 | ASSERT_RTNL(); | |
351638e7 JP |
1663 | return raw_notifier_call_chain(&netdev_chain, val, info); |
1664 | } | |
351638e7 | 1665 | |
26372605 PM |
1666 | static int call_netdevice_notifiers_extack(unsigned long val, |
1667 | struct net_device *dev, | |
1668 | struct netlink_ext_ack *extack) | |
1669 | { | |
1670 | struct netdev_notifier_info info = { | |
1671 | .dev = dev, | |
1672 | .extack = extack, | |
1673 | }; | |
1674 | ||
1675 | return call_netdevice_notifiers_info(val, &info); | |
1676 | } | |
1677 | ||
1da177e4 LT |
1678 | /** |
1679 | * call_netdevice_notifiers - call all network notifier blocks | |
1680 | * @val: value passed unmodified to notifier function | |
c4ea43c5 | 1681 | * @dev: net_device pointer passed unmodified to notifier function |
1da177e4 LT |
1682 | * |
1683 | * Call all network notifier blocks. Parameters and return value | |
f07d5b94 | 1684 | * are as for raw_notifier_call_chain(). |
1da177e4 LT |
1685 | */ |
1686 | ||
ad7379d4 | 1687 | int call_netdevice_notifiers(unsigned long val, struct net_device *dev) |
1da177e4 | 1688 | { |
26372605 | 1689 | return call_netdevice_notifiers_extack(val, dev, NULL); |
1da177e4 | 1690 | } |
edf947f1 | 1691 | EXPORT_SYMBOL(call_netdevice_notifiers); |
1da177e4 | 1692 | |
af7d6cce SD |
1693 | /** |
1694 | * call_netdevice_notifiers_mtu - call all network notifier blocks | |
1695 | * @val: value passed unmodified to notifier function | |
1696 | * @dev: net_device pointer passed unmodified to notifier function | |
1697 | * @arg: additional u32 argument passed to the notifier function | |
1698 | * | |
1699 | * Call all network notifier blocks. Parameters and return value | |
1700 | * are as for raw_notifier_call_chain(). | |
1701 | */ | |
1702 | static int call_netdevice_notifiers_mtu(unsigned long val, | |
1703 | struct net_device *dev, u32 arg) | |
1704 | { | |
1705 | struct netdev_notifier_info_ext info = { | |
1706 | .info.dev = dev, | |
1707 | .ext.mtu = arg, | |
1708 | }; | |
1709 | ||
1710 | BUILD_BUG_ON(offsetof(struct netdev_notifier_info_ext, info) != 0); | |
1711 | ||
1712 | return call_netdevice_notifiers_info(val, &info.info); | |
1713 | } | |
1714 | ||
1cf51900 | 1715 | #ifdef CONFIG_NET_INGRESS |
aabf6772 | 1716 | static DEFINE_STATIC_KEY_FALSE(ingress_needed_key); |
4577139b DB |
1717 | |
1718 | void net_inc_ingress_queue(void) | |
1719 | { | |
aabf6772 | 1720 | static_branch_inc(&ingress_needed_key); |
4577139b DB |
1721 | } |
1722 | EXPORT_SYMBOL_GPL(net_inc_ingress_queue); | |
1723 | ||
1724 | void net_dec_ingress_queue(void) | |
1725 | { | |
aabf6772 | 1726 | static_branch_dec(&ingress_needed_key); |
4577139b DB |
1727 | } |
1728 | EXPORT_SYMBOL_GPL(net_dec_ingress_queue); | |
1729 | #endif | |
1730 | ||
1f211a1b | 1731 | #ifdef CONFIG_NET_EGRESS |
aabf6772 | 1732 | static DEFINE_STATIC_KEY_FALSE(egress_needed_key); |
1f211a1b DB |
1733 | |
1734 | void net_inc_egress_queue(void) | |
1735 | { | |
aabf6772 | 1736 | static_branch_inc(&egress_needed_key); |
1f211a1b DB |
1737 | } |
1738 | EXPORT_SYMBOL_GPL(net_inc_egress_queue); | |
1739 | ||
1740 | void net_dec_egress_queue(void) | |
1741 | { | |
aabf6772 | 1742 | static_branch_dec(&egress_needed_key); |
1f211a1b DB |
1743 | } |
1744 | EXPORT_SYMBOL_GPL(net_dec_egress_queue); | |
1745 | #endif | |
1746 | ||
39e83922 | 1747 | static DEFINE_STATIC_KEY_FALSE(netstamp_needed_key); |
e9666d10 | 1748 | #ifdef CONFIG_JUMP_LABEL |
b90e5794 | 1749 | static atomic_t netstamp_needed_deferred; |
13baa00a | 1750 | static atomic_t netstamp_wanted; |
5fa8bbda | 1751 | static void netstamp_clear(struct work_struct *work) |
1da177e4 | 1752 | { |
b90e5794 | 1753 | int deferred = atomic_xchg(&netstamp_needed_deferred, 0); |
13baa00a | 1754 | int wanted; |
b90e5794 | 1755 | |
13baa00a ED |
1756 | wanted = atomic_add_return(deferred, &netstamp_wanted); |
1757 | if (wanted > 0) | |
39e83922 | 1758 | static_branch_enable(&netstamp_needed_key); |
13baa00a | 1759 | else |
39e83922 | 1760 | static_branch_disable(&netstamp_needed_key); |
5fa8bbda ED |
1761 | } |
1762 | static DECLARE_WORK(netstamp_work, netstamp_clear); | |
b90e5794 | 1763 | #endif |
5fa8bbda ED |
1764 | |
1765 | void net_enable_timestamp(void) | |
1766 | { | |
e9666d10 | 1767 | #ifdef CONFIG_JUMP_LABEL |
13baa00a ED |
1768 | int wanted; |
1769 | ||
1770 | while (1) { | |
1771 | wanted = atomic_read(&netstamp_wanted); | |
1772 | if (wanted <= 0) | |
1773 | break; | |
1774 | if (atomic_cmpxchg(&netstamp_wanted, wanted, wanted + 1) == wanted) | |
1775 | return; | |
1776 | } | |
1777 | atomic_inc(&netstamp_needed_deferred); | |
1778 | schedule_work(&netstamp_work); | |
1779 | #else | |
39e83922 | 1780 | static_branch_inc(&netstamp_needed_key); |
13baa00a | 1781 | #endif |
1da177e4 | 1782 | } |
d1b19dff | 1783 | EXPORT_SYMBOL(net_enable_timestamp); |
1da177e4 LT |
1784 | |
1785 | void net_disable_timestamp(void) | |
1786 | { | |
e9666d10 | 1787 | #ifdef CONFIG_JUMP_LABEL |
13baa00a ED |
1788 | int wanted; |
1789 | ||
1790 | while (1) { | |
1791 | wanted = atomic_read(&netstamp_wanted); | |
1792 | if (wanted <= 1) | |
1793 | break; | |
1794 | if (atomic_cmpxchg(&netstamp_wanted, wanted, wanted - 1) == wanted) | |
1795 | return; | |
1796 | } | |
1797 | atomic_dec(&netstamp_needed_deferred); | |
5fa8bbda ED |
1798 | schedule_work(&netstamp_work); |
1799 | #else | |
39e83922 | 1800 | static_branch_dec(&netstamp_needed_key); |
5fa8bbda | 1801 | #endif |
1da177e4 | 1802 | } |
d1b19dff | 1803 | EXPORT_SYMBOL(net_disable_timestamp); |
1da177e4 | 1804 | |
3b098e2d | 1805 | static inline void net_timestamp_set(struct sk_buff *skb) |
1da177e4 | 1806 | { |
2456e855 | 1807 | skb->tstamp = 0; |
39e83922 | 1808 | if (static_branch_unlikely(&netstamp_needed_key)) |
a61bbcf2 | 1809 | __net_timestamp(skb); |
1da177e4 LT |
1810 | } |
1811 | ||
39e83922 DB |
1812 | #define net_timestamp_check(COND, SKB) \ |
1813 | if (static_branch_unlikely(&netstamp_needed_key)) { \ | |
1814 | if ((COND) && !(SKB)->tstamp) \ | |
1815 | __net_timestamp(SKB); \ | |
1816 | } \ | |
3b098e2d | 1817 | |
f4b05d27 | 1818 | bool is_skb_forwardable(const struct net_device *dev, const struct sk_buff *skb) |
79b569f0 DL |
1819 | { |
1820 | unsigned int len; | |
1821 | ||
1822 | if (!(dev->flags & IFF_UP)) | |
1823 | return false; | |
1824 | ||
1825 | len = dev->mtu + dev->hard_header_len + VLAN_HLEN; | |
1826 | if (skb->len <= len) | |
1827 | return true; | |
1828 | ||
1829 | /* if TSO is enabled, we don't care about the length as the packet | |
1830 | * could be forwarded without being segmented before | |
1831 | */ | |
1832 | if (skb_is_gso(skb)) | |
1833 | return true; | |
1834 | ||
1835 | return false; | |
1836 | } | |
1ee481fb | 1837 | EXPORT_SYMBOL_GPL(is_skb_forwardable); |
79b569f0 | 1838 | |
a0265d28 HX |
1839 | int __dev_forward_skb(struct net_device *dev, struct sk_buff *skb) |
1840 | { | |
4e3264d2 | 1841 | int ret = ____dev_forward_skb(dev, skb); |
a0265d28 | 1842 | |
4e3264d2 MKL |
1843 | if (likely(!ret)) { |
1844 | skb->protocol = eth_type_trans(skb, dev); | |
1845 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); | |
1846 | } | |
a0265d28 | 1847 | |
4e3264d2 | 1848 | return ret; |
a0265d28 HX |
1849 | } |
1850 | EXPORT_SYMBOL_GPL(__dev_forward_skb); | |
1851 | ||
44540960 AB |
1852 | /** |
1853 | * dev_forward_skb - loopback an skb to another netif | |
1854 | * | |
1855 | * @dev: destination network device | |
1856 | * @skb: buffer to forward | |
1857 | * | |
1858 | * return values: | |
1859 | * NET_RX_SUCCESS (no congestion) | |
6ec82562 | 1860 | * NET_RX_DROP (packet was dropped, but freed) |
44540960 AB |
1861 | * |
1862 | * dev_forward_skb can be used for injecting an skb from the | |
1863 | * start_xmit function of one device into the receive queue | |
1864 | * of another device. | |
1865 | * | |
1866 | * The receiving device may be in another namespace, so | |
1867 | * we have to clear all information in the skb that could | |
1868 | * impact namespace isolation. | |
1869 | */ | |
1870 | int dev_forward_skb(struct net_device *dev, struct sk_buff *skb) | |
1871 | { | |
a0265d28 | 1872 | return __dev_forward_skb(dev, skb) ?: netif_rx_internal(skb); |
44540960 AB |
1873 | } |
1874 | EXPORT_SYMBOL_GPL(dev_forward_skb); | |
1875 | ||
71d9dec2 CG |
1876 | static inline int deliver_skb(struct sk_buff *skb, |
1877 | struct packet_type *pt_prev, | |
1878 | struct net_device *orig_dev) | |
1879 | { | |
1f8b977a | 1880 | if (unlikely(skb_orphan_frags_rx(skb, GFP_ATOMIC))) |
1080e512 | 1881 | return -ENOMEM; |
63354797 | 1882 | refcount_inc(&skb->users); |
71d9dec2 CG |
1883 | return pt_prev->func(skb, skb->dev, pt_prev, orig_dev); |
1884 | } | |
1885 | ||
7866a621 SN |
1886 | static inline void deliver_ptype_list_skb(struct sk_buff *skb, |
1887 | struct packet_type **pt, | |
fbcb2170 JP |
1888 | struct net_device *orig_dev, |
1889 | __be16 type, | |
7866a621 SN |
1890 | struct list_head *ptype_list) |
1891 | { | |
1892 | struct packet_type *ptype, *pt_prev = *pt; | |
1893 | ||
1894 | list_for_each_entry_rcu(ptype, ptype_list, list) { | |
1895 | if (ptype->type != type) | |
1896 | continue; | |
1897 | if (pt_prev) | |
fbcb2170 | 1898 | deliver_skb(skb, pt_prev, orig_dev); |
7866a621 SN |
1899 | pt_prev = ptype; |
1900 | } | |
1901 | *pt = pt_prev; | |
1902 | } | |
1903 | ||
c0de08d0 EL |
1904 | static inline bool skb_loop_sk(struct packet_type *ptype, struct sk_buff *skb) |
1905 | { | |
a3d744e9 | 1906 | if (!ptype->af_packet_priv || !skb->sk) |
c0de08d0 EL |
1907 | return false; |
1908 | ||
1909 | if (ptype->id_match) | |
1910 | return ptype->id_match(ptype, skb->sk); | |
1911 | else if ((struct sock *)ptype->af_packet_priv == skb->sk) | |
1912 | return true; | |
1913 | ||
1914 | return false; | |
1915 | } | |
1916 | ||
9f9a742d MR |
1917 | /** |
1918 | * dev_nit_active - return true if any network interface taps are in use | |
1919 | * | |
1920 | * @dev: network device to check for the presence of taps | |
1921 | */ | |
1922 | bool dev_nit_active(struct net_device *dev) | |
1923 | { | |
1924 | return !list_empty(&ptype_all) || !list_empty(&dev->ptype_all); | |
1925 | } | |
1926 | EXPORT_SYMBOL_GPL(dev_nit_active); | |
1927 | ||
1da177e4 LT |
1928 | /* |
1929 | * Support routine. Sends outgoing frames to any network | |
1930 | * taps currently in use. | |
1931 | */ | |
1932 | ||
74b20582 | 1933 | void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
1934 | { |
1935 | struct packet_type *ptype; | |
71d9dec2 CG |
1936 | struct sk_buff *skb2 = NULL; |
1937 | struct packet_type *pt_prev = NULL; | |
7866a621 | 1938 | struct list_head *ptype_list = &ptype_all; |
a61bbcf2 | 1939 | |
1da177e4 | 1940 | rcu_read_lock(); |
7866a621 SN |
1941 | again: |
1942 | list_for_each_entry_rcu(ptype, ptype_list, list) { | |
fa788d98 VW |
1943 | if (ptype->ignore_outgoing) |
1944 | continue; | |
1945 | ||
1da177e4 LT |
1946 | /* Never send packets back to the socket |
1947 | * they originated from - MvS (miquels@drinkel.ow.org) | |
1948 | */ | |
7866a621 SN |
1949 | if (skb_loop_sk(ptype, skb)) |
1950 | continue; | |
71d9dec2 | 1951 | |
7866a621 SN |
1952 | if (pt_prev) { |
1953 | deliver_skb(skb2, pt_prev, skb->dev); | |
1954 | pt_prev = ptype; | |
1955 | continue; | |
1956 | } | |
1da177e4 | 1957 | |
7866a621 SN |
1958 | /* need to clone skb, done only once */ |
1959 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1960 | if (!skb2) | |
1961 | goto out_unlock; | |
70978182 | 1962 | |
7866a621 | 1963 | net_timestamp_set(skb2); |
1da177e4 | 1964 | |
7866a621 SN |
1965 | /* skb->nh should be correctly |
1966 | * set by sender, so that the second statement is | |
1967 | * just protection against buggy protocols. | |
1968 | */ | |
1969 | skb_reset_mac_header(skb2); | |
1970 | ||
1971 | if (skb_network_header(skb2) < skb2->data || | |
1972 | skb_network_header(skb2) > skb_tail_pointer(skb2)) { | |
1973 | net_crit_ratelimited("protocol %04x is buggy, dev %s\n", | |
1974 | ntohs(skb2->protocol), | |
1975 | dev->name); | |
1976 | skb_reset_network_header(skb2); | |
1da177e4 | 1977 | } |
7866a621 SN |
1978 | |
1979 | skb2->transport_header = skb2->network_header; | |
1980 | skb2->pkt_type = PACKET_OUTGOING; | |
1981 | pt_prev = ptype; | |
1982 | } | |
1983 | ||
1984 | if (ptype_list == &ptype_all) { | |
1985 | ptype_list = &dev->ptype_all; | |
1986 | goto again; | |
1da177e4 | 1987 | } |
7866a621 | 1988 | out_unlock: |
581fe0ea WB |
1989 | if (pt_prev) { |
1990 | if (!skb_orphan_frags_rx(skb2, GFP_ATOMIC)) | |
1991 | pt_prev->func(skb2, skb->dev, pt_prev, skb->dev); | |
1992 | else | |
1993 | kfree_skb(skb2); | |
1994 | } | |
1da177e4 LT |
1995 | rcu_read_unlock(); |
1996 | } | |
74b20582 | 1997 | EXPORT_SYMBOL_GPL(dev_queue_xmit_nit); |
1da177e4 | 1998 | |
2c53040f BH |
1999 | /** |
2000 | * netif_setup_tc - Handle tc mappings on real_num_tx_queues change | |
4f57c087 JF |
2001 | * @dev: Network device |
2002 | * @txq: number of queues available | |
2003 | * | |
2004 | * If real_num_tx_queues is changed the tc mappings may no longer be | |
2005 | * valid. To resolve this verify the tc mapping remains valid and if | |
2006 | * not NULL the mapping. With no priorities mapping to this | |
2007 | * offset/count pair it will no longer be used. In the worst case TC0 | |
2008 | * is invalid nothing can be done so disable priority mappings. If is | |
2009 | * expected that drivers will fix this mapping if they can before | |
2010 | * calling netif_set_real_num_tx_queues. | |
2011 | */ | |
bb134d22 | 2012 | static void netif_setup_tc(struct net_device *dev, unsigned int txq) |
4f57c087 JF |
2013 | { |
2014 | int i; | |
2015 | struct netdev_tc_txq *tc = &dev->tc_to_txq[0]; | |
2016 | ||
2017 | /* If TC0 is invalidated disable TC mapping */ | |
2018 | if (tc->offset + tc->count > txq) { | |
7b6cd1ce | 2019 | pr_warn("Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n"); |
4f57c087 JF |
2020 | dev->num_tc = 0; |
2021 | return; | |
2022 | } | |
2023 | ||
2024 | /* Invalidated prio to tc mappings set to TC0 */ | |
2025 | for (i = 1; i < TC_BITMASK + 1; i++) { | |
2026 | int q = netdev_get_prio_tc_map(dev, i); | |
2027 | ||
2028 | tc = &dev->tc_to_txq[q]; | |
2029 | if (tc->offset + tc->count > txq) { | |
7b6cd1ce JP |
2030 | pr_warn("Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n", |
2031 | i, q); | |
4f57c087 JF |
2032 | netdev_set_prio_tc_map(dev, i, 0); |
2033 | } | |
2034 | } | |
2035 | } | |
2036 | ||
8d059b0f AD |
2037 | int netdev_txq_to_tc(struct net_device *dev, unsigned int txq) |
2038 | { | |
2039 | if (dev->num_tc) { | |
2040 | struct netdev_tc_txq *tc = &dev->tc_to_txq[0]; | |
2041 | int i; | |
2042 | ||
ffcfe25b | 2043 | /* walk through the TCs and see if it falls into any of them */ |
8d059b0f AD |
2044 | for (i = 0; i < TC_MAX_QUEUE; i++, tc++) { |
2045 | if ((txq - tc->offset) < tc->count) | |
2046 | return i; | |
2047 | } | |
2048 | ||
ffcfe25b | 2049 | /* didn't find it, just return -1 to indicate no match */ |
8d059b0f AD |
2050 | return -1; |
2051 | } | |
2052 | ||
2053 | return 0; | |
2054 | } | |
8a5f2166 | 2055 | EXPORT_SYMBOL(netdev_txq_to_tc); |
8d059b0f | 2056 | |
537c00de | 2057 | #ifdef CONFIG_XPS |
04157469 AN |
2058 | struct static_key xps_needed __read_mostly; |
2059 | EXPORT_SYMBOL(xps_needed); | |
2060 | struct static_key xps_rxqs_needed __read_mostly; | |
2061 | EXPORT_SYMBOL(xps_rxqs_needed); | |
537c00de AD |
2062 | static DEFINE_MUTEX(xps_map_mutex); |
2063 | #define xmap_dereference(P) \ | |
2064 | rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex)) | |
2065 | ||
6234f874 AD |
2066 | static bool remove_xps_queue(struct xps_dev_maps *dev_maps, |
2067 | int tci, u16 index) | |
537c00de | 2068 | { |
10cdc3f3 AD |
2069 | struct xps_map *map = NULL; |
2070 | int pos; | |
537c00de | 2071 | |
10cdc3f3 | 2072 | if (dev_maps) |
80d19669 | 2073 | map = xmap_dereference(dev_maps->attr_map[tci]); |
6234f874 AD |
2074 | if (!map) |
2075 | return false; | |
537c00de | 2076 | |
6234f874 AD |
2077 | for (pos = map->len; pos--;) { |
2078 | if (map->queues[pos] != index) | |
2079 | continue; | |
2080 | ||
2081 | if (map->len > 1) { | |
2082 | map->queues[pos] = map->queues[--map->len]; | |
10cdc3f3 | 2083 | break; |
537c00de | 2084 | } |
6234f874 | 2085 | |
80d19669 | 2086 | RCU_INIT_POINTER(dev_maps->attr_map[tci], NULL); |
6234f874 AD |
2087 | kfree_rcu(map, rcu); |
2088 | return false; | |
537c00de AD |
2089 | } |
2090 | ||
6234f874 | 2091 | return true; |
10cdc3f3 AD |
2092 | } |
2093 | ||
6234f874 AD |
2094 | static bool remove_xps_queue_cpu(struct net_device *dev, |
2095 | struct xps_dev_maps *dev_maps, | |
2096 | int cpu, u16 offset, u16 count) | |
2097 | { | |
184c449f AD |
2098 | int num_tc = dev->num_tc ? : 1; |
2099 | bool active = false; | |
2100 | int tci; | |
6234f874 | 2101 | |
184c449f AD |
2102 | for (tci = cpu * num_tc; num_tc--; tci++) { |
2103 | int i, j; | |
2104 | ||
2105 | for (i = count, j = offset; i--; j++) { | |
6358d49a | 2106 | if (!remove_xps_queue(dev_maps, tci, j)) |
184c449f AD |
2107 | break; |
2108 | } | |
2109 | ||
2110 | active |= i < 0; | |
6234f874 AD |
2111 | } |
2112 | ||
184c449f | 2113 | return active; |
6234f874 AD |
2114 | } |
2115 | ||
867d0ad4 SD |
2116 | static void reset_xps_maps(struct net_device *dev, |
2117 | struct xps_dev_maps *dev_maps, | |
2118 | bool is_rxqs_map) | |
2119 | { | |
2120 | if (is_rxqs_map) { | |
2121 | static_key_slow_dec_cpuslocked(&xps_rxqs_needed); | |
2122 | RCU_INIT_POINTER(dev->xps_rxqs_map, NULL); | |
2123 | } else { | |
2124 | RCU_INIT_POINTER(dev->xps_cpus_map, NULL); | |
2125 | } | |
2126 | static_key_slow_dec_cpuslocked(&xps_needed); | |
2127 | kfree_rcu(dev_maps, rcu); | |
2128 | } | |
2129 | ||
80d19669 AN |
2130 | static void clean_xps_maps(struct net_device *dev, const unsigned long *mask, |
2131 | struct xps_dev_maps *dev_maps, unsigned int nr_ids, | |
2132 | u16 offset, u16 count, bool is_rxqs_map) | |
2133 | { | |
2134 | bool active = false; | |
2135 | int i, j; | |
2136 | ||
2137 | for (j = -1; j = netif_attrmask_next(j, mask, nr_ids), | |
2138 | j < nr_ids;) | |
2139 | active |= remove_xps_queue_cpu(dev, dev_maps, j, offset, | |
2140 | count); | |
867d0ad4 SD |
2141 | if (!active) |
2142 | reset_xps_maps(dev, dev_maps, is_rxqs_map); | |
80d19669 | 2143 | |
f28c020f SD |
2144 | if (!is_rxqs_map) { |
2145 | for (i = offset + (count - 1); count--; i--) { | |
2146 | netdev_queue_numa_node_write( | |
2147 | netdev_get_tx_queue(dev, i), | |
2148 | NUMA_NO_NODE); | |
80d19669 | 2149 | } |
80d19669 AN |
2150 | } |
2151 | } | |
2152 | ||
6234f874 AD |
2153 | static void netif_reset_xps_queues(struct net_device *dev, u16 offset, |
2154 | u16 count) | |
10cdc3f3 | 2155 | { |
80d19669 | 2156 | const unsigned long *possible_mask = NULL; |
10cdc3f3 | 2157 | struct xps_dev_maps *dev_maps; |
80d19669 | 2158 | unsigned int nr_ids; |
10cdc3f3 | 2159 | |
04157469 AN |
2160 | if (!static_key_false(&xps_needed)) |
2161 | return; | |
10cdc3f3 | 2162 | |
4d99f660 | 2163 | cpus_read_lock(); |
04157469 | 2164 | mutex_lock(&xps_map_mutex); |
10cdc3f3 | 2165 | |
04157469 AN |
2166 | if (static_key_false(&xps_rxqs_needed)) { |
2167 | dev_maps = xmap_dereference(dev->xps_rxqs_map); | |
2168 | if (dev_maps) { | |
2169 | nr_ids = dev->num_rx_queues; | |
2170 | clean_xps_maps(dev, possible_mask, dev_maps, nr_ids, | |
2171 | offset, count, true); | |
2172 | } | |
537c00de AD |
2173 | } |
2174 | ||
80d19669 AN |
2175 | dev_maps = xmap_dereference(dev->xps_cpus_map); |
2176 | if (!dev_maps) | |
2177 | goto out_no_maps; | |
2178 | ||
2179 | if (num_possible_cpus() > 1) | |
2180 | possible_mask = cpumask_bits(cpu_possible_mask); | |
2181 | nr_ids = nr_cpu_ids; | |
2182 | clean_xps_maps(dev, possible_mask, dev_maps, nr_ids, offset, count, | |
2183 | false); | |
024e9679 | 2184 | |
537c00de AD |
2185 | out_no_maps: |
2186 | mutex_unlock(&xps_map_mutex); | |
4d99f660 | 2187 | cpus_read_unlock(); |
537c00de AD |
2188 | } |
2189 | ||
6234f874 AD |
2190 | static void netif_reset_xps_queues_gt(struct net_device *dev, u16 index) |
2191 | { | |
2192 | netif_reset_xps_queues(dev, index, dev->num_tx_queues - index); | |
2193 | } | |
2194 | ||
80d19669 AN |
2195 | static struct xps_map *expand_xps_map(struct xps_map *map, int attr_index, |
2196 | u16 index, bool is_rxqs_map) | |
01c5f864 AD |
2197 | { |
2198 | struct xps_map *new_map; | |
2199 | int alloc_len = XPS_MIN_MAP_ALLOC; | |
2200 | int i, pos; | |
2201 | ||
2202 | for (pos = 0; map && pos < map->len; pos++) { | |
2203 | if (map->queues[pos] != index) | |
2204 | continue; | |
2205 | return map; | |
2206 | } | |
2207 | ||
80d19669 | 2208 | /* Need to add tx-queue to this CPU's/rx-queue's existing map */ |
01c5f864 AD |
2209 | if (map) { |
2210 | if (pos < map->alloc_len) | |
2211 | return map; | |
2212 | ||
2213 | alloc_len = map->alloc_len * 2; | |
2214 | } | |
2215 | ||
80d19669 AN |
2216 | /* Need to allocate new map to store tx-queue on this CPU's/rx-queue's |
2217 | * map | |
2218 | */ | |
2219 | if (is_rxqs_map) | |
2220 | new_map = kzalloc(XPS_MAP_SIZE(alloc_len), GFP_KERNEL); | |
2221 | else | |
2222 | new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len), GFP_KERNEL, | |
2223 | cpu_to_node(attr_index)); | |
01c5f864 AD |
2224 | if (!new_map) |
2225 | return NULL; | |
2226 | ||
2227 | for (i = 0; i < pos; i++) | |
2228 | new_map->queues[i] = map->queues[i]; | |
2229 | new_map->alloc_len = alloc_len; | |
2230 | new_map->len = pos; | |
2231 | ||
2232 | return new_map; | |
2233 | } | |
2234 | ||
4d99f660 | 2235 | /* Must be called under cpus_read_lock */ |
80d19669 AN |
2236 | int __netif_set_xps_queue(struct net_device *dev, const unsigned long *mask, |
2237 | u16 index, bool is_rxqs_map) | |
537c00de | 2238 | { |
80d19669 | 2239 | const unsigned long *online_mask = NULL, *possible_mask = NULL; |
01c5f864 | 2240 | struct xps_dev_maps *dev_maps, *new_dev_maps = NULL; |
80d19669 | 2241 | int i, j, tci, numa_node_id = -2; |
184c449f | 2242 | int maps_sz, num_tc = 1, tc = 0; |
537c00de | 2243 | struct xps_map *map, *new_map; |
01c5f864 | 2244 | bool active = false; |
80d19669 | 2245 | unsigned int nr_ids; |
537c00de | 2246 | |
184c449f | 2247 | if (dev->num_tc) { |
ffcfe25b | 2248 | /* Do not allow XPS on subordinate device directly */ |
184c449f | 2249 | num_tc = dev->num_tc; |
ffcfe25b AD |
2250 | if (num_tc < 0) |
2251 | return -EINVAL; | |
2252 | ||
2253 | /* If queue belongs to subordinate dev use its map */ | |
2254 | dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev; | |
2255 | ||
184c449f AD |
2256 | tc = netdev_txq_to_tc(dev, index); |
2257 | if (tc < 0) | |
2258 | return -EINVAL; | |
2259 | } | |
2260 | ||
537c00de | 2261 | mutex_lock(&xps_map_mutex); |
80d19669 AN |
2262 | if (is_rxqs_map) { |
2263 | maps_sz = XPS_RXQ_DEV_MAPS_SIZE(num_tc, dev->num_rx_queues); | |
2264 | dev_maps = xmap_dereference(dev->xps_rxqs_map); | |
2265 | nr_ids = dev->num_rx_queues; | |
2266 | } else { | |
2267 | maps_sz = XPS_CPU_DEV_MAPS_SIZE(num_tc); | |
2268 | if (num_possible_cpus() > 1) { | |
2269 | online_mask = cpumask_bits(cpu_online_mask); | |
2270 | possible_mask = cpumask_bits(cpu_possible_mask); | |
2271 | } | |
2272 | dev_maps = xmap_dereference(dev->xps_cpus_map); | |
2273 | nr_ids = nr_cpu_ids; | |
2274 | } | |
537c00de | 2275 | |
80d19669 AN |
2276 | if (maps_sz < L1_CACHE_BYTES) |
2277 | maps_sz = L1_CACHE_BYTES; | |
537c00de | 2278 | |
01c5f864 | 2279 | /* allocate memory for queue storage */ |
80d19669 AN |
2280 | for (j = -1; j = netif_attrmask_next_and(j, online_mask, mask, nr_ids), |
2281 | j < nr_ids;) { | |
01c5f864 AD |
2282 | if (!new_dev_maps) |
2283 | new_dev_maps = kzalloc(maps_sz, GFP_KERNEL); | |
2bb60cb9 AD |
2284 | if (!new_dev_maps) { |
2285 | mutex_unlock(&xps_map_mutex); | |
01c5f864 | 2286 | return -ENOMEM; |
2bb60cb9 | 2287 | } |
01c5f864 | 2288 | |
80d19669 AN |
2289 | tci = j * num_tc + tc; |
2290 | map = dev_maps ? xmap_dereference(dev_maps->attr_map[tci]) : | |
01c5f864 AD |
2291 | NULL; |
2292 | ||
80d19669 | 2293 | map = expand_xps_map(map, j, index, is_rxqs_map); |
01c5f864 AD |
2294 | if (!map) |
2295 | goto error; | |
2296 | ||
80d19669 | 2297 | RCU_INIT_POINTER(new_dev_maps->attr_map[tci], map); |
01c5f864 AD |
2298 | } |
2299 | ||
2300 | if (!new_dev_maps) | |
2301 | goto out_no_new_maps; | |
2302 | ||
867d0ad4 SD |
2303 | if (!dev_maps) { |
2304 | /* Increment static keys at most once per type */ | |
2305 | static_key_slow_inc_cpuslocked(&xps_needed); | |
2306 | if (is_rxqs_map) | |
2307 | static_key_slow_inc_cpuslocked(&xps_rxqs_needed); | |
2308 | } | |
04157469 | 2309 | |
80d19669 AN |
2310 | for (j = -1; j = netif_attrmask_next(j, possible_mask, nr_ids), |
2311 | j < nr_ids;) { | |
184c449f | 2312 | /* copy maps belonging to foreign traffic classes */ |
80d19669 | 2313 | for (i = tc, tci = j * num_tc; dev_maps && i--; tci++) { |
184c449f | 2314 | /* fill in the new device map from the old device map */ |
80d19669 AN |
2315 | map = xmap_dereference(dev_maps->attr_map[tci]); |
2316 | RCU_INIT_POINTER(new_dev_maps->attr_map[tci], map); | |
184c449f AD |
2317 | } |
2318 | ||
2319 | /* We need to explicitly update tci as prevous loop | |
2320 | * could break out early if dev_maps is NULL. | |
2321 | */ | |
80d19669 | 2322 | tci = j * num_tc + tc; |
184c449f | 2323 | |
80d19669 AN |
2324 | if (netif_attr_test_mask(j, mask, nr_ids) && |
2325 | netif_attr_test_online(j, online_mask, nr_ids)) { | |
2326 | /* add tx-queue to CPU/rx-queue maps */ | |
01c5f864 AD |
2327 | int pos = 0; |
2328 | ||
80d19669 | 2329 | map = xmap_dereference(new_dev_maps->attr_map[tci]); |
01c5f864 AD |
2330 | while ((pos < map->len) && (map->queues[pos] != index)) |
2331 | pos++; | |
2332 | ||
2333 | if (pos == map->len) | |
2334 | map->queues[map->len++] = index; | |
537c00de | 2335 | #ifdef CONFIG_NUMA |
80d19669 AN |
2336 | if (!is_rxqs_map) { |
2337 | if (numa_node_id == -2) | |
2338 | numa_node_id = cpu_to_node(j); | |
2339 | else if (numa_node_id != cpu_to_node(j)) | |
2340 | numa_node_id = -1; | |
2341 | } | |
537c00de | 2342 | #endif |
01c5f864 AD |
2343 | } else if (dev_maps) { |
2344 | /* fill in the new device map from the old device map */ | |
80d19669 AN |
2345 | map = xmap_dereference(dev_maps->attr_map[tci]); |
2346 | RCU_INIT_POINTER(new_dev_maps->attr_map[tci], map); | |
537c00de | 2347 | } |
01c5f864 | 2348 | |
184c449f AD |
2349 | /* copy maps belonging to foreign traffic classes */ |
2350 | for (i = num_tc - tc, tci++; dev_maps && --i; tci++) { | |
2351 | /* fill in the new device map from the old device map */ | |
80d19669 AN |
2352 | map = xmap_dereference(dev_maps->attr_map[tci]); |
2353 | RCU_INIT_POINTER(new_dev_maps->attr_map[tci], map); | |
184c449f | 2354 | } |
537c00de AD |
2355 | } |
2356 | ||
80d19669 AN |
2357 | if (is_rxqs_map) |
2358 | rcu_assign_pointer(dev->xps_rxqs_map, new_dev_maps); | |
2359 | else | |
2360 | rcu_assign_pointer(dev->xps_cpus_map, new_dev_maps); | |
01c5f864 | 2361 | |
537c00de | 2362 | /* Cleanup old maps */ |
184c449f AD |
2363 | if (!dev_maps) |
2364 | goto out_no_old_maps; | |
2365 | ||
80d19669 AN |
2366 | for (j = -1; j = netif_attrmask_next(j, possible_mask, nr_ids), |
2367 | j < nr_ids;) { | |
2368 | for (i = num_tc, tci = j * num_tc; i--; tci++) { | |
2369 | new_map = xmap_dereference(new_dev_maps->attr_map[tci]); | |
2370 | map = xmap_dereference(dev_maps->attr_map[tci]); | |
01c5f864 AD |
2371 | if (map && map != new_map) |
2372 | kfree_rcu(map, rcu); | |
2373 | } | |
537c00de AD |
2374 | } |
2375 | ||
184c449f AD |
2376 | kfree_rcu(dev_maps, rcu); |
2377 | ||
2378 | out_no_old_maps: | |
01c5f864 AD |
2379 | dev_maps = new_dev_maps; |
2380 | active = true; | |
537c00de | 2381 | |
01c5f864 | 2382 | out_no_new_maps: |
80d19669 AN |
2383 | if (!is_rxqs_map) { |
2384 | /* update Tx queue numa node */ | |
2385 | netdev_queue_numa_node_write(netdev_get_tx_queue(dev, index), | |
2386 | (numa_node_id >= 0) ? | |
2387 | numa_node_id : NUMA_NO_NODE); | |
2388 | } | |
537c00de | 2389 | |
01c5f864 AD |
2390 | if (!dev_maps) |
2391 | goto out_no_maps; | |
2392 | ||
80d19669 AN |
2393 | /* removes tx-queue from unused CPUs/rx-queues */ |
2394 | for (j = -1; j = netif_attrmask_next(j, possible_mask, nr_ids), | |
2395 | j < nr_ids;) { | |
2396 | for (i = tc, tci = j * num_tc; i--; tci++) | |
184c449f | 2397 | active |= remove_xps_queue(dev_maps, tci, index); |
80d19669 AN |
2398 | if (!netif_attr_test_mask(j, mask, nr_ids) || |
2399 | !netif_attr_test_online(j, online_mask, nr_ids)) | |
184c449f AD |
2400 | active |= remove_xps_queue(dev_maps, tci, index); |
2401 | for (i = num_tc - tc, tci++; --i; tci++) | |
2402 | active |= remove_xps_queue(dev_maps, tci, index); | |
01c5f864 AD |
2403 | } |
2404 | ||
2405 | /* free map if not active */ | |
867d0ad4 SD |
2406 | if (!active) |
2407 | reset_xps_maps(dev, dev_maps, is_rxqs_map); | |
01c5f864 AD |
2408 | |
2409 | out_no_maps: | |
537c00de AD |
2410 | mutex_unlock(&xps_map_mutex); |
2411 | ||
2412 | return 0; | |
2413 | error: | |
01c5f864 | 2414 | /* remove any maps that we added */ |
80d19669 AN |
2415 | for (j = -1; j = netif_attrmask_next(j, possible_mask, nr_ids), |
2416 | j < nr_ids;) { | |
2417 | for (i = num_tc, tci = j * num_tc; i--; tci++) { | |
2418 | new_map = xmap_dereference(new_dev_maps->attr_map[tci]); | |
184c449f | 2419 | map = dev_maps ? |
80d19669 | 2420 | xmap_dereference(dev_maps->attr_map[tci]) : |
184c449f AD |
2421 | NULL; |
2422 | if (new_map && new_map != map) | |
2423 | kfree(new_map); | |
2424 | } | |
01c5f864 AD |
2425 | } |
2426 | ||
537c00de AD |
2427 | mutex_unlock(&xps_map_mutex); |
2428 | ||
537c00de AD |
2429 | kfree(new_dev_maps); |
2430 | return -ENOMEM; | |
2431 | } | |
4d99f660 | 2432 | EXPORT_SYMBOL_GPL(__netif_set_xps_queue); |
80d19669 AN |
2433 | |
2434 | int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask, | |
2435 | u16 index) | |
2436 | { | |
4d99f660 AV |
2437 | int ret; |
2438 | ||
2439 | cpus_read_lock(); | |
2440 | ret = __netif_set_xps_queue(dev, cpumask_bits(mask), index, false); | |
2441 | cpus_read_unlock(); | |
2442 | ||
2443 | return ret; | |
80d19669 | 2444 | } |
537c00de AD |
2445 | EXPORT_SYMBOL(netif_set_xps_queue); |
2446 | ||
2447 | #endif | |
ffcfe25b AD |
2448 | static void netdev_unbind_all_sb_channels(struct net_device *dev) |
2449 | { | |
2450 | struct netdev_queue *txq = &dev->_tx[dev->num_tx_queues]; | |
2451 | ||
2452 | /* Unbind any subordinate channels */ | |
2453 | while (txq-- != &dev->_tx[0]) { | |
2454 | if (txq->sb_dev) | |
2455 | netdev_unbind_sb_channel(dev, txq->sb_dev); | |
2456 | } | |
2457 | } | |
2458 | ||
9cf1f6a8 AD |
2459 | void netdev_reset_tc(struct net_device *dev) |
2460 | { | |
6234f874 AD |
2461 | #ifdef CONFIG_XPS |
2462 | netif_reset_xps_queues_gt(dev, 0); | |
2463 | #endif | |
ffcfe25b AD |
2464 | netdev_unbind_all_sb_channels(dev); |
2465 | ||
2466 | /* Reset TC configuration of device */ | |
9cf1f6a8 AD |
2467 | dev->num_tc = 0; |
2468 | memset(dev->tc_to_txq, 0, sizeof(dev->tc_to_txq)); | |
2469 | memset(dev->prio_tc_map, 0, sizeof(dev->prio_tc_map)); | |
2470 | } | |
2471 | EXPORT_SYMBOL(netdev_reset_tc); | |
2472 | ||
2473 | int netdev_set_tc_queue(struct net_device *dev, u8 tc, u16 count, u16 offset) | |
2474 | { | |
2475 | if (tc >= dev->num_tc) | |
2476 | return -EINVAL; | |
2477 | ||
6234f874 AD |
2478 | #ifdef CONFIG_XPS |
2479 | netif_reset_xps_queues(dev, offset, count); | |
2480 | #endif | |
9cf1f6a8 AD |
2481 | dev->tc_to_txq[tc].count = count; |
2482 | dev->tc_to_txq[tc].offset = offset; | |
2483 | return 0; | |
2484 | } | |
2485 | EXPORT_SYMBOL(netdev_set_tc_queue); | |
2486 | ||
2487 | int netdev_set_num_tc(struct net_device *dev, u8 num_tc) | |
2488 | { | |
2489 | if (num_tc > TC_MAX_QUEUE) | |
2490 | return -EINVAL; | |
2491 | ||
6234f874 AD |
2492 | #ifdef CONFIG_XPS |
2493 | netif_reset_xps_queues_gt(dev, 0); | |
2494 | #endif | |
ffcfe25b AD |
2495 | netdev_unbind_all_sb_channels(dev); |
2496 | ||
9cf1f6a8 AD |
2497 | dev->num_tc = num_tc; |
2498 | return 0; | |
2499 | } | |
2500 | EXPORT_SYMBOL(netdev_set_num_tc); | |
2501 | ||
ffcfe25b AD |
2502 | void netdev_unbind_sb_channel(struct net_device *dev, |
2503 | struct net_device *sb_dev) | |
2504 | { | |
2505 | struct netdev_queue *txq = &dev->_tx[dev->num_tx_queues]; | |
2506 | ||
2507 | #ifdef CONFIG_XPS | |
2508 | netif_reset_xps_queues_gt(sb_dev, 0); | |
2509 | #endif | |
2510 | memset(sb_dev->tc_to_txq, 0, sizeof(sb_dev->tc_to_txq)); | |
2511 | memset(sb_dev->prio_tc_map, 0, sizeof(sb_dev->prio_tc_map)); | |
2512 | ||
2513 | while (txq-- != &dev->_tx[0]) { | |
2514 | if (txq->sb_dev == sb_dev) | |
2515 | txq->sb_dev = NULL; | |
2516 | } | |
2517 | } | |
2518 | EXPORT_SYMBOL(netdev_unbind_sb_channel); | |
2519 | ||
2520 | int netdev_bind_sb_channel_queue(struct net_device *dev, | |
2521 | struct net_device *sb_dev, | |
2522 | u8 tc, u16 count, u16 offset) | |
2523 | { | |
2524 | /* Make certain the sb_dev and dev are already configured */ | |
2525 | if (sb_dev->num_tc >= 0 || tc >= dev->num_tc) | |
2526 | return -EINVAL; | |
2527 | ||
2528 | /* We cannot hand out queues we don't have */ | |
2529 | if ((offset + count) > dev->real_num_tx_queues) | |
2530 | return -EINVAL; | |
2531 | ||
2532 | /* Record the mapping */ | |
2533 | sb_dev->tc_to_txq[tc].count = count; | |
2534 | sb_dev->tc_to_txq[tc].offset = offset; | |
2535 | ||
2536 | /* Provide a way for Tx queue to find the tc_to_txq map or | |
2537 | * XPS map for itself. | |
2538 | */ | |
2539 | while (count--) | |
2540 | netdev_get_tx_queue(dev, count + offset)->sb_dev = sb_dev; | |
2541 | ||
2542 | return 0; | |
2543 | } | |
2544 | EXPORT_SYMBOL(netdev_bind_sb_channel_queue); | |
2545 | ||
2546 | int netdev_set_sb_channel(struct net_device *dev, u16 channel) | |
2547 | { | |
2548 | /* Do not use a multiqueue device to represent a subordinate channel */ | |
2549 | if (netif_is_multiqueue(dev)) | |
2550 | return -ENODEV; | |
2551 | ||
2552 | /* We allow channels 1 - 32767 to be used for subordinate channels. | |
2553 | * Channel 0 is meant to be "native" mode and used only to represent | |
2554 | * the main root device. We allow writing 0 to reset the device back | |
2555 | * to normal mode after being used as a subordinate channel. | |
2556 | */ | |
2557 | if (channel > S16_MAX) | |
2558 | return -EINVAL; | |
2559 | ||
2560 | dev->num_tc = -channel; | |
2561 | ||
2562 | return 0; | |
2563 | } | |
2564 | EXPORT_SYMBOL(netdev_set_sb_channel); | |
2565 | ||
f0796d5c JF |
2566 | /* |
2567 | * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues | |
3a053b1a | 2568 | * greater than real_num_tx_queues stale skbs on the qdisc must be flushed. |
f0796d5c | 2569 | */ |
e6484930 | 2570 | int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq) |
f0796d5c | 2571 | { |
ac5b7019 | 2572 | bool disabling; |
1d24eb48 TH |
2573 | int rc; |
2574 | ||
ac5b7019 JK |
2575 | disabling = txq < dev->real_num_tx_queues; |
2576 | ||
e6484930 TH |
2577 | if (txq < 1 || txq > dev->num_tx_queues) |
2578 | return -EINVAL; | |
f0796d5c | 2579 | |
5c56580b BH |
2580 | if (dev->reg_state == NETREG_REGISTERED || |
2581 | dev->reg_state == NETREG_UNREGISTERING) { | |
e6484930 TH |
2582 | ASSERT_RTNL(); |
2583 | ||
1d24eb48 TH |
2584 | rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues, |
2585 | txq); | |
bf264145 TH |
2586 | if (rc) |
2587 | return rc; | |
2588 | ||
4f57c087 JF |
2589 | if (dev->num_tc) |
2590 | netif_setup_tc(dev, txq); | |
2591 | ||
6780b2c1 JK |
2592 | dev_qdisc_change_real_num_tx(dev, txq); |
2593 | ||
ac5b7019 JK |
2594 | dev->real_num_tx_queues = txq; |
2595 | ||
2596 | if (disabling) { | |
2597 | synchronize_net(); | |
e6484930 | 2598 | qdisc_reset_all_tx_gt(dev, txq); |
024e9679 AD |
2599 | #ifdef CONFIG_XPS |
2600 | netif_reset_xps_queues_gt(dev, txq); | |
2601 | #endif | |
2602 | } | |
ac5b7019 JK |
2603 | } else { |
2604 | dev->real_num_tx_queues = txq; | |
f0796d5c | 2605 | } |
e6484930 | 2606 | |
e6484930 | 2607 | return 0; |
f0796d5c JF |
2608 | } |
2609 | EXPORT_SYMBOL(netif_set_real_num_tx_queues); | |
56079431 | 2610 | |
a953be53 | 2611 | #ifdef CONFIG_SYSFS |
62fe0b40 BH |
2612 | /** |
2613 | * netif_set_real_num_rx_queues - set actual number of RX queues used | |
2614 | * @dev: Network device | |
2615 | * @rxq: Actual number of RX queues | |
2616 | * | |
2617 | * This must be called either with the rtnl_lock held or before | |
2618 | * registration of the net device. Returns 0 on success, or a | |
4e7f7951 BH |
2619 | * negative error code. If called before registration, it always |
2620 | * succeeds. | |
62fe0b40 BH |
2621 | */ |
2622 | int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq) | |
2623 | { | |
2624 | int rc; | |
2625 | ||
bd25fa7b TH |
2626 | if (rxq < 1 || rxq > dev->num_rx_queues) |
2627 | return -EINVAL; | |
2628 | ||
62fe0b40 BH |
2629 | if (dev->reg_state == NETREG_REGISTERED) { |
2630 | ASSERT_RTNL(); | |
2631 | ||
62fe0b40 BH |
2632 | rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues, |
2633 | rxq); | |
2634 | if (rc) | |
2635 | return rc; | |
62fe0b40 BH |
2636 | } |
2637 | ||
2638 | dev->real_num_rx_queues = rxq; | |
2639 | return 0; | |
2640 | } | |
2641 | EXPORT_SYMBOL(netif_set_real_num_rx_queues); | |
2642 | #endif | |
2643 | ||
2c53040f BH |
2644 | /** |
2645 | * netif_get_num_default_rss_queues - default number of RSS queues | |
16917b87 YM |
2646 | * |
2647 | * This routine should set an upper limit on the number of RSS queues | |
2648 | * used by default by multiqueue devices. | |
2649 | */ | |
a55b138b | 2650 | int netif_get_num_default_rss_queues(void) |
16917b87 | 2651 | { |
40e4e713 HS |
2652 | return is_kdump_kernel() ? |
2653 | 1 : min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES, num_online_cpus()); | |
16917b87 YM |
2654 | } |
2655 | EXPORT_SYMBOL(netif_get_num_default_rss_queues); | |
2656 | ||
3bcb846c | 2657 | static void __netif_reschedule(struct Qdisc *q) |
56079431 | 2658 | { |
def82a1d JP |
2659 | struct softnet_data *sd; |
2660 | unsigned long flags; | |
56079431 | 2661 | |
def82a1d | 2662 | local_irq_save(flags); |
903ceff7 | 2663 | sd = this_cpu_ptr(&softnet_data); |
a9cbd588 CG |
2664 | q->next_sched = NULL; |
2665 | *sd->output_queue_tailp = q; | |
2666 | sd->output_queue_tailp = &q->next_sched; | |
def82a1d JP |
2667 | raise_softirq_irqoff(NET_TX_SOFTIRQ); |
2668 | local_irq_restore(flags); | |
2669 | } | |
2670 | ||
2671 | void __netif_schedule(struct Qdisc *q) | |
2672 | { | |
2673 | if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state)) | |
2674 | __netif_reschedule(q); | |
56079431 DV |
2675 | } |
2676 | EXPORT_SYMBOL(__netif_schedule); | |
2677 | ||
e6247027 ED |
2678 | struct dev_kfree_skb_cb { |
2679 | enum skb_free_reason reason; | |
2680 | }; | |
2681 | ||
2682 | static struct dev_kfree_skb_cb *get_kfree_skb_cb(const struct sk_buff *skb) | |
56079431 | 2683 | { |
e6247027 ED |
2684 | return (struct dev_kfree_skb_cb *)skb->cb; |
2685 | } | |
2686 | ||
46e5da40 JF |
2687 | void netif_schedule_queue(struct netdev_queue *txq) |
2688 | { | |
2689 | rcu_read_lock(); | |
2690 | if (!(txq->state & QUEUE_STATE_ANY_XOFF)) { | |
2691 | struct Qdisc *q = rcu_dereference(txq->qdisc); | |
2692 | ||
2693 | __netif_schedule(q); | |
2694 | } | |
2695 | rcu_read_unlock(); | |
2696 | } | |
2697 | EXPORT_SYMBOL(netif_schedule_queue); | |
2698 | ||
46e5da40 JF |
2699 | void netif_tx_wake_queue(struct netdev_queue *dev_queue) |
2700 | { | |
2701 | if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state)) { | |
2702 | struct Qdisc *q; | |
2703 | ||
2704 | rcu_read_lock(); | |
2705 | q = rcu_dereference(dev_queue->qdisc); | |
2706 | __netif_schedule(q); | |
2707 | rcu_read_unlock(); | |
2708 | } | |
2709 | } | |
2710 | EXPORT_SYMBOL(netif_tx_wake_queue); | |
2711 | ||
e6247027 | 2712 | void __dev_kfree_skb_irq(struct sk_buff *skb, enum skb_free_reason reason) |
56079431 | 2713 | { |
e6247027 | 2714 | unsigned long flags; |
56079431 | 2715 | |
9899886d MJ |
2716 | if (unlikely(!skb)) |
2717 | return; | |
2718 | ||
63354797 | 2719 | if (likely(refcount_read(&skb->users) == 1)) { |
e6247027 | 2720 | smp_rmb(); |
63354797 RE |
2721 | refcount_set(&skb->users, 0); |
2722 | } else if (likely(!refcount_dec_and_test(&skb->users))) { | |
e6247027 | 2723 | return; |
bea3348e | 2724 | } |
e6247027 ED |
2725 | get_kfree_skb_cb(skb)->reason = reason; |
2726 | local_irq_save(flags); | |
2727 | skb->next = __this_cpu_read(softnet_data.completion_queue); | |
2728 | __this_cpu_write(softnet_data.completion_queue, skb); | |
2729 | raise_softirq_irqoff(NET_TX_SOFTIRQ); | |
2730 | local_irq_restore(flags); | |
56079431 | 2731 | } |
e6247027 | 2732 | EXPORT_SYMBOL(__dev_kfree_skb_irq); |
56079431 | 2733 | |
e6247027 | 2734 | void __dev_kfree_skb_any(struct sk_buff *skb, enum skb_free_reason reason) |
56079431 DV |
2735 | { |
2736 | if (in_irq() || irqs_disabled()) | |
e6247027 | 2737 | __dev_kfree_skb_irq(skb, reason); |
56079431 DV |
2738 | else |
2739 | dev_kfree_skb(skb); | |
2740 | } | |
e6247027 | 2741 | EXPORT_SYMBOL(__dev_kfree_skb_any); |
56079431 DV |
2742 | |
2743 | ||
bea3348e SH |
2744 | /** |
2745 | * netif_device_detach - mark device as removed | |
2746 | * @dev: network device | |
2747 | * | |
2748 | * Mark device as removed from system and therefore no longer available. | |
2749 | */ | |
56079431 DV |
2750 | void netif_device_detach(struct net_device *dev) |
2751 | { | |
2752 | if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) && | |
2753 | netif_running(dev)) { | |
d543103a | 2754 | netif_tx_stop_all_queues(dev); |
56079431 DV |
2755 | } |
2756 | } | |
2757 | EXPORT_SYMBOL(netif_device_detach); | |
2758 | ||
bea3348e SH |
2759 | /** |
2760 | * netif_device_attach - mark device as attached | |
2761 | * @dev: network device | |
2762 | * | |
2763 | * Mark device as attached from system and restart if needed. | |
2764 | */ | |
56079431 DV |
2765 | void netif_device_attach(struct net_device *dev) |
2766 | { | |
2767 | if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) && | |
2768 | netif_running(dev)) { | |
d543103a | 2769 | netif_tx_wake_all_queues(dev); |
4ec93edb | 2770 | __netdev_watchdog_up(dev); |
56079431 DV |
2771 | } |
2772 | } | |
2773 | EXPORT_SYMBOL(netif_device_attach); | |
2774 | ||
5605c762 JP |
2775 | /* |
2776 | * Returns a Tx hash based on the given packet descriptor a Tx queues' number | |
2777 | * to be used as a distribution range. | |
2778 | */ | |
eadec877 AD |
2779 | static u16 skb_tx_hash(const struct net_device *dev, |
2780 | const struct net_device *sb_dev, | |
2781 | struct sk_buff *skb) | |
5605c762 JP |
2782 | { |
2783 | u32 hash; | |
2784 | u16 qoffset = 0; | |
1b837d48 | 2785 | u16 qcount = dev->real_num_tx_queues; |
5605c762 | 2786 | |
eadec877 AD |
2787 | if (dev->num_tc) { |
2788 | u8 tc = netdev_get_prio_tc_map(dev, skb->priority); | |
2789 | ||
2790 | qoffset = sb_dev->tc_to_txq[tc].offset; | |
2791 | qcount = sb_dev->tc_to_txq[tc].count; | |
77a3f78a MC |
2792 | if (unlikely(!qcount)) { |
2793 | net_warn_ratelimited("%s: invalid qcount, qoffset %u for tc %u\n", | |
2794 | sb_dev->name, qoffset, tc); | |
2795 | qoffset = 0; | |
2796 | qcount = dev->real_num_tx_queues; | |
2797 | } | |
eadec877 AD |
2798 | } |
2799 | ||
5605c762 JP |
2800 | if (skb_rx_queue_recorded(skb)) { |
2801 | hash = skb_get_rx_queue(skb); | |
8a133699 AN |
2802 | if (hash >= qoffset) |
2803 | hash -= qoffset; | |
1b837d48 AD |
2804 | while (unlikely(hash >= qcount)) |
2805 | hash -= qcount; | |
eadec877 | 2806 | return hash + qoffset; |
5605c762 JP |
2807 | } |
2808 | ||
2809 | return (u16) reciprocal_scale(skb_get_hash(skb), qcount) + qoffset; | |
2810 | } | |
5605c762 | 2811 | |
36c92474 BH |
2812 | static void skb_warn_bad_offload(const struct sk_buff *skb) |
2813 | { | |
84d15ae5 | 2814 | static const netdev_features_t null_features; |
36c92474 | 2815 | struct net_device *dev = skb->dev; |
88ad4175 | 2816 | const char *name = ""; |
36c92474 | 2817 | |
c846ad9b BG |
2818 | if (!net_ratelimit()) |
2819 | return; | |
2820 | ||
88ad4175 BM |
2821 | if (dev) { |
2822 | if (dev->dev.parent) | |
2823 | name = dev_driver_string(dev->dev.parent); | |
2824 | else | |
2825 | name = netdev_name(dev); | |
2826 | } | |
6413139d WB |
2827 | skb_dump(KERN_WARNING, skb, false); |
2828 | WARN(1, "%s: caps=(%pNF, %pNF)\n", | |
88ad4175 | 2829 | name, dev ? &dev->features : &null_features, |
6413139d | 2830 | skb->sk ? &skb->sk->sk_route_caps : &null_features); |
36c92474 BH |
2831 | } |
2832 | ||
1da177e4 LT |
2833 | /* |
2834 | * Invalidate hardware checksum when packet is to be mangled, and | |
2835 | * complete checksum manually on outgoing path. | |
2836 | */ | |
84fa7933 | 2837 | int skb_checksum_help(struct sk_buff *skb) |
1da177e4 | 2838 | { |
d3bc23e7 | 2839 | __wsum csum; |
663ead3b | 2840 | int ret = 0, offset; |
1da177e4 | 2841 | |
84fa7933 | 2842 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
a430a43d HX |
2843 | goto out_set_summed; |
2844 | ||
2845 | if (unlikely(skb_shinfo(skb)->gso_size)) { | |
36c92474 BH |
2846 | skb_warn_bad_offload(skb); |
2847 | return -EINVAL; | |
1da177e4 LT |
2848 | } |
2849 | ||
cef401de ED |
2850 | /* Before computing a checksum, we should make sure no frag could |
2851 | * be modified by an external entity : checksum could be wrong. | |
2852 | */ | |
2853 | if (skb_has_shared_frag(skb)) { | |
2854 | ret = __skb_linearize(skb); | |
2855 | if (ret) | |
2856 | goto out; | |
2857 | } | |
2858 | ||
55508d60 | 2859 | offset = skb_checksum_start_offset(skb); |
a030847e HX |
2860 | BUG_ON(offset >= skb_headlen(skb)); |
2861 | csum = skb_checksum(skb, offset, skb->len - offset, 0); | |
2862 | ||
2863 | offset += skb->csum_offset; | |
2864 | BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb)); | |
2865 | ||
2866 | if (skb_cloned(skb) && | |
2867 | !skb_clone_writable(skb, offset + sizeof(__sum16))) { | |
1da177e4 LT |
2868 | ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC); |
2869 | if (ret) | |
2870 | goto out; | |
2871 | } | |
2872 | ||
4f2e4ad5 | 2873 | *(__sum16 *)(skb->data + offset) = csum_fold(csum) ?: CSUM_MANGLED_0; |
a430a43d | 2874 | out_set_summed: |
1da177e4 | 2875 | skb->ip_summed = CHECKSUM_NONE; |
4ec93edb | 2876 | out: |
1da177e4 LT |
2877 | return ret; |
2878 | } | |
d1b19dff | 2879 | EXPORT_SYMBOL(skb_checksum_help); |
1da177e4 | 2880 | |
b72b5bf6 DC |
2881 | int skb_crc32c_csum_help(struct sk_buff *skb) |
2882 | { | |
2883 | __le32 crc32c_csum; | |
2884 | int ret = 0, offset, start; | |
2885 | ||
2886 | if (skb->ip_summed != CHECKSUM_PARTIAL) | |
2887 | goto out; | |
2888 | ||
2889 | if (unlikely(skb_is_gso(skb))) | |
2890 | goto out; | |
2891 | ||
2892 | /* Before computing a checksum, we should make sure no frag could | |
2893 | * be modified by an external entity : checksum could be wrong. | |
2894 | */ | |
2895 | if (unlikely(skb_has_shared_frag(skb))) { | |
2896 | ret = __skb_linearize(skb); | |
2897 | if (ret) | |
2898 | goto out; | |
2899 | } | |
2900 | start = skb_checksum_start_offset(skb); | |
2901 | offset = start + offsetof(struct sctphdr, checksum); | |
2902 | if (WARN_ON_ONCE(offset >= skb_headlen(skb))) { | |
2903 | ret = -EINVAL; | |
2904 | goto out; | |
2905 | } | |
2906 | if (skb_cloned(skb) && | |
2907 | !skb_clone_writable(skb, offset + sizeof(__le32))) { | |
2908 | ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC); | |
2909 | if (ret) | |
2910 | goto out; | |
2911 | } | |
2912 | crc32c_csum = cpu_to_le32(~__skb_checksum(skb, start, | |
2913 | skb->len - start, ~(__u32)0, | |
2914 | crc32c_csum_stub)); | |
2915 | *(__le32 *)(skb->data + offset) = crc32c_csum; | |
2916 | skb->ip_summed = CHECKSUM_NONE; | |
dba00306 | 2917 | skb->csum_not_inet = 0; |
b72b5bf6 DC |
2918 | out: |
2919 | return ret; | |
2920 | } | |
2921 | ||
53d6471c | 2922 | __be16 skb_network_protocol(struct sk_buff *skb, int *depth) |
f6a78bfc | 2923 | { |
252e3346 | 2924 | __be16 type = skb->protocol; |
f6a78bfc | 2925 | |
19acc327 PS |
2926 | /* Tunnel gso handlers can set protocol to ethernet. */ |
2927 | if (type == htons(ETH_P_TEB)) { | |
2928 | struct ethhdr *eth; | |
2929 | ||
2930 | if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr)))) | |
2931 | return 0; | |
2932 | ||
1dfe82eb | 2933 | eth = (struct ethhdr *)skb->data; |
19acc327 PS |
2934 | type = eth->h_proto; |
2935 | } | |
2936 | ||
d4bcef3f | 2937 | return __vlan_get_protocol(skb, type, depth); |
ec5f0615 PS |
2938 | } |
2939 | ||
2940 | /** | |
2941 | * skb_mac_gso_segment - mac layer segmentation handler. | |
2942 | * @skb: buffer to segment | |
2943 | * @features: features for the output path (see dev->features) | |
2944 | */ | |
2945 | struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb, | |
2946 | netdev_features_t features) | |
2947 | { | |
2948 | struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT); | |
2949 | struct packet_offload *ptype; | |
53d6471c VY |
2950 | int vlan_depth = skb->mac_len; |
2951 | __be16 type = skb_network_protocol(skb, &vlan_depth); | |
ec5f0615 PS |
2952 | |
2953 | if (unlikely(!type)) | |
2954 | return ERR_PTR(-EINVAL); | |
2955 | ||
53d6471c | 2956 | __skb_pull(skb, vlan_depth); |
f6a78bfc HX |
2957 | |
2958 | rcu_read_lock(); | |
22061d80 | 2959 | list_for_each_entry_rcu(ptype, &offload_base, list) { |
f191a1d1 | 2960 | if (ptype->type == type && ptype->callbacks.gso_segment) { |
f191a1d1 | 2961 | segs = ptype->callbacks.gso_segment(skb, features); |
f6a78bfc HX |
2962 | break; |
2963 | } | |
2964 | } | |
2965 | rcu_read_unlock(); | |
2966 | ||
98e399f8 | 2967 | __skb_push(skb, skb->data - skb_mac_header(skb)); |
576a30eb | 2968 | |
f6a78bfc HX |
2969 | return segs; |
2970 | } | |
05e8ef4a PS |
2971 | EXPORT_SYMBOL(skb_mac_gso_segment); |
2972 | ||
2973 | ||
2974 | /* openvswitch calls this on rx path, so we need a different check. | |
2975 | */ | |
2976 | static inline bool skb_needs_check(struct sk_buff *skb, bool tx_path) | |
2977 | { | |
2978 | if (tx_path) | |
0c19f846 WB |
2979 | return skb->ip_summed != CHECKSUM_PARTIAL && |
2980 | skb->ip_summed != CHECKSUM_UNNECESSARY; | |
6e7bc478 ED |
2981 | |
2982 | return skb->ip_summed == CHECKSUM_NONE; | |
05e8ef4a PS |
2983 | } |
2984 | ||
2985 | /** | |
2986 | * __skb_gso_segment - Perform segmentation on skb. | |
2987 | * @skb: buffer to segment | |
2988 | * @features: features for the output path (see dev->features) | |
2989 | * @tx_path: whether it is called in TX path | |
2990 | * | |
2991 | * This function segments the given skb and returns a list of segments. | |
2992 | * | |
2993 | * It may return NULL if the skb requires no segmentation. This is | |
2994 | * only possible when GSO is used for verifying header integrity. | |
9207f9d4 KK |
2995 | * |
2996 | * Segmentation preserves SKB_SGO_CB_OFFSET bytes of previous skb cb. | |
05e8ef4a PS |
2997 | */ |
2998 | struct sk_buff *__skb_gso_segment(struct sk_buff *skb, | |
2999 | netdev_features_t features, bool tx_path) | |
3000 | { | |
b2504a5d ED |
3001 | struct sk_buff *segs; |
3002 | ||
05e8ef4a PS |
3003 | if (unlikely(skb_needs_check(skb, tx_path))) { |
3004 | int err; | |
3005 | ||
b2504a5d | 3006 | /* We're going to init ->check field in TCP or UDP header */ |
a40e0a66 | 3007 | err = skb_cow_head(skb, 0); |
3008 | if (err < 0) | |
05e8ef4a PS |
3009 | return ERR_PTR(err); |
3010 | } | |
3011 | ||
802ab55a AD |
3012 | /* Only report GSO partial support if it will enable us to |
3013 | * support segmentation on this frame without needing additional | |
3014 | * work. | |
3015 | */ | |
3016 | if (features & NETIF_F_GSO_PARTIAL) { | |
3017 | netdev_features_t partial_features = NETIF_F_GSO_ROBUST; | |
3018 | struct net_device *dev = skb->dev; | |
3019 | ||
3020 | partial_features |= dev->features & dev->gso_partial_features; | |
3021 | if (!skb_gso_ok(skb, features | partial_features)) | |
3022 | features &= ~NETIF_F_GSO_PARTIAL; | |
3023 | } | |
3024 | ||
9207f9d4 KK |
3025 | BUILD_BUG_ON(SKB_SGO_CB_OFFSET + |
3026 | sizeof(*SKB_GSO_CB(skb)) > sizeof(skb->cb)); | |
3027 | ||
68c33163 | 3028 | SKB_GSO_CB(skb)->mac_offset = skb_headroom(skb); |
3347c960 ED |
3029 | SKB_GSO_CB(skb)->encap_level = 0; |
3030 | ||
05e8ef4a PS |
3031 | skb_reset_mac_header(skb); |
3032 | skb_reset_mac_len(skb); | |
3033 | ||
b2504a5d ED |
3034 | segs = skb_mac_gso_segment(skb, features); |
3035 | ||
8d74e9f8 | 3036 | if (unlikely(skb_needs_check(skb, tx_path) && !IS_ERR(segs))) |
b2504a5d ED |
3037 | skb_warn_bad_offload(skb); |
3038 | ||
3039 | return segs; | |
05e8ef4a | 3040 | } |
12b0004d | 3041 | EXPORT_SYMBOL(__skb_gso_segment); |
f6a78bfc | 3042 | |
fb286bb2 HX |
3043 | /* Take action when hardware reception checksum errors are detected. */ |
3044 | #ifdef CONFIG_BUG | |
7fe50ac8 | 3045 | void netdev_rx_csum_fault(struct net_device *dev, struct sk_buff *skb) |
fb286bb2 HX |
3046 | { |
3047 | if (net_ratelimit()) { | |
7b6cd1ce | 3048 | pr_err("%s: hw csum failure\n", dev ? dev->name : "<unknown>"); |
6413139d | 3049 | skb_dump(KERN_ERR, skb, true); |
fb286bb2 HX |
3050 | dump_stack(); |
3051 | } | |
3052 | } | |
3053 | EXPORT_SYMBOL(netdev_rx_csum_fault); | |
3054 | #endif | |
3055 | ||
ab74cfeb | 3056 | /* XXX: check that highmem exists at all on the given machine. */ |
c1e756bf | 3057 | static int illegal_highdma(struct net_device *dev, struct sk_buff *skb) |
1da177e4 | 3058 | { |
3d3a8533 | 3059 | #ifdef CONFIG_HIGHMEM |
1da177e4 | 3060 | int i; |
f4563a75 | 3061 | |
5acbbd42 | 3062 | if (!(dev->features & NETIF_F_HIGHDMA)) { |
ea2ab693 IC |
3063 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { |
3064 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; | |
f4563a75 | 3065 | |
ea2ab693 | 3066 | if (PageHighMem(skb_frag_page(frag))) |
5acbbd42 | 3067 | return 1; |
ea2ab693 | 3068 | } |
5acbbd42 | 3069 | } |
3d3a8533 | 3070 | #endif |
1da177e4 LT |
3071 | return 0; |
3072 | } | |
1da177e4 | 3073 | |
3b392ddb SH |
3074 | /* If MPLS offload request, verify we are testing hardware MPLS features |
3075 | * instead of standard features for the netdev. | |
3076 | */ | |
d0edc7bf | 3077 | #if IS_ENABLED(CONFIG_NET_MPLS_GSO) |
3b392ddb SH |
3078 | static netdev_features_t net_mpls_features(struct sk_buff *skb, |
3079 | netdev_features_t features, | |
3080 | __be16 type) | |
3081 | { | |
25cd9ba0 | 3082 | if (eth_p_mpls(type)) |
3b392ddb SH |
3083 | features &= skb->dev->mpls_features; |
3084 | ||
3085 | return features; | |
3086 | } | |
3087 | #else | |
3088 | static netdev_features_t net_mpls_features(struct sk_buff *skb, | |
3089 | netdev_features_t features, | |
3090 | __be16 type) | |
3091 | { | |
3092 | return features; | |
3093 | } | |
3094 | #endif | |
3095 | ||
c8f44aff | 3096 | static netdev_features_t harmonize_features(struct sk_buff *skb, |
c1e756bf | 3097 | netdev_features_t features) |
f01a5236 | 3098 | { |
53d6471c | 3099 | int tmp; |
3b392ddb SH |
3100 | __be16 type; |
3101 | ||
3102 | type = skb_network_protocol(skb, &tmp); | |
3103 | features = net_mpls_features(skb, features, type); | |
53d6471c | 3104 | |
c0d680e5 | 3105 | if (skb->ip_summed != CHECKSUM_NONE && |
3b392ddb | 3106 | !can_checksum_protocol(features, type)) { |
996e8021 | 3107 | features &= ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK); |
f01a5236 | 3108 | } |
7be2c82c ED |
3109 | if (illegal_highdma(skb->dev, skb)) |
3110 | features &= ~NETIF_F_SG; | |
f01a5236 JG |
3111 | |
3112 | return features; | |
3113 | } | |
3114 | ||
e38f3025 TM |
3115 | netdev_features_t passthru_features_check(struct sk_buff *skb, |
3116 | struct net_device *dev, | |
3117 | netdev_features_t features) | |
3118 | { | |
3119 | return features; | |
3120 | } | |
3121 | EXPORT_SYMBOL(passthru_features_check); | |
3122 | ||
7ce23672 | 3123 | static netdev_features_t dflt_features_check(struct sk_buff *skb, |
8cb65d00 TM |
3124 | struct net_device *dev, |
3125 | netdev_features_t features) | |
3126 | { | |
3127 | return vlan_features_check(skb, features); | |
3128 | } | |
3129 | ||
cbc53e08 AD |
3130 | static netdev_features_t gso_features_check(const struct sk_buff *skb, |
3131 | struct net_device *dev, | |
3132 | netdev_features_t features) | |
3133 | { | |
3134 | u16 gso_segs = skb_shinfo(skb)->gso_segs; | |
3135 | ||
3136 | if (gso_segs > dev->gso_max_segs) | |
3137 | return features & ~NETIF_F_GSO_MASK; | |
3138 | ||
802ab55a AD |
3139 | /* Support for GSO partial features requires software |
3140 | * intervention before we can actually process the packets | |
3141 | * so we need to strip support for any partial features now | |
3142 | * and we can pull them back in after we have partially | |
3143 | * segmented the frame. | |
3144 | */ | |
3145 | if (!(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL)) | |
3146 | features &= ~dev->gso_partial_features; | |
3147 | ||
3148 | /* Make sure to clear the IPv4 ID mangling feature if the | |
3149 | * IPv4 header has the potential to be fragmented. | |
cbc53e08 AD |
3150 | */ |
3151 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) { | |
3152 | struct iphdr *iph = skb->encapsulation ? | |
3153 | inner_ip_hdr(skb) : ip_hdr(skb); | |
3154 | ||
3155 | if (!(iph->frag_off & htons(IP_DF))) | |
3156 | features &= ~NETIF_F_TSO_MANGLEID; | |
3157 | } | |
3158 | ||
3159 | return features; | |
3160 | } | |
3161 | ||
c1e756bf | 3162 | netdev_features_t netif_skb_features(struct sk_buff *skb) |
58e998c6 | 3163 | { |
5f35227e | 3164 | struct net_device *dev = skb->dev; |
fcbeb976 | 3165 | netdev_features_t features = dev->features; |
58e998c6 | 3166 | |
cbc53e08 AD |
3167 | if (skb_is_gso(skb)) |
3168 | features = gso_features_check(skb, dev, features); | |
30b678d8 | 3169 | |
5f35227e JG |
3170 | /* If encapsulation offload request, verify we are testing |
3171 | * hardware encapsulation features instead of standard | |
3172 | * features for the netdev | |
3173 | */ | |
3174 | if (skb->encapsulation) | |
3175 | features &= dev->hw_enc_features; | |
3176 | ||
f5a7fb88 TM |
3177 | if (skb_vlan_tagged(skb)) |
3178 | features = netdev_intersect_features(features, | |
3179 | dev->vlan_features | | |
3180 | NETIF_F_HW_VLAN_CTAG_TX | | |
3181 | NETIF_F_HW_VLAN_STAG_TX); | |
f01a5236 | 3182 | |
5f35227e JG |
3183 | if (dev->netdev_ops->ndo_features_check) |
3184 | features &= dev->netdev_ops->ndo_features_check(skb, dev, | |
3185 | features); | |
8cb65d00 TM |
3186 | else |
3187 | features &= dflt_features_check(skb, dev, features); | |
5f35227e | 3188 | |
c1e756bf | 3189 | return harmonize_features(skb, features); |
58e998c6 | 3190 | } |
c1e756bf | 3191 | EXPORT_SYMBOL(netif_skb_features); |
58e998c6 | 3192 | |
2ea25513 | 3193 | static int xmit_one(struct sk_buff *skb, struct net_device *dev, |
95f6b3dd | 3194 | struct netdev_queue *txq, bool more) |
f6a78bfc | 3195 | { |
2ea25513 DM |
3196 | unsigned int len; |
3197 | int rc; | |
00829823 | 3198 | |
9f9a742d | 3199 | if (dev_nit_active(dev)) |
2ea25513 | 3200 | dev_queue_xmit_nit(skb, dev); |
fc741216 | 3201 | |
2ea25513 DM |
3202 | len = skb->len; |
3203 | trace_net_dev_start_xmit(skb, dev); | |
95f6b3dd | 3204 | rc = netdev_start_xmit(skb, dev, txq, more); |
2ea25513 | 3205 | trace_net_dev_xmit(skb, rc, dev, len); |
adf30907 | 3206 | |
2ea25513 DM |
3207 | return rc; |
3208 | } | |
7b9c6090 | 3209 | |
8dcda22a DM |
3210 | struct sk_buff *dev_hard_start_xmit(struct sk_buff *first, struct net_device *dev, |
3211 | struct netdev_queue *txq, int *ret) | |
7f2e870f DM |
3212 | { |
3213 | struct sk_buff *skb = first; | |
3214 | int rc = NETDEV_TX_OK; | |
7b9c6090 | 3215 | |
7f2e870f DM |
3216 | while (skb) { |
3217 | struct sk_buff *next = skb->next; | |
fc70fb64 | 3218 | |
a8305bff | 3219 | skb_mark_not_on_list(skb); |
95f6b3dd | 3220 | rc = xmit_one(skb, dev, txq, next != NULL); |
7f2e870f DM |
3221 | if (unlikely(!dev_xmit_complete(rc))) { |
3222 | skb->next = next; | |
3223 | goto out; | |
3224 | } | |
6afff0ca | 3225 | |
7f2e870f | 3226 | skb = next; |
fe60faa5 | 3227 | if (netif_tx_queue_stopped(txq) && skb) { |
7f2e870f DM |
3228 | rc = NETDEV_TX_BUSY; |
3229 | break; | |
9ccb8975 | 3230 | } |
7f2e870f | 3231 | } |
9ccb8975 | 3232 | |
7f2e870f DM |
3233 | out: |
3234 | *ret = rc; | |
3235 | return skb; | |
3236 | } | |
b40863c6 | 3237 | |
1ff0dc94 ED |
3238 | static struct sk_buff *validate_xmit_vlan(struct sk_buff *skb, |
3239 | netdev_features_t features) | |
f6a78bfc | 3240 | { |
df8a39de | 3241 | if (skb_vlan_tag_present(skb) && |
5968250c JP |
3242 | !vlan_hw_offload_capable(features, skb->vlan_proto)) |
3243 | skb = __vlan_hwaccel_push_inside(skb); | |
eae3f88e DM |
3244 | return skb; |
3245 | } | |
f6a78bfc | 3246 | |
43c26a1a DC |
3247 | int skb_csum_hwoffload_help(struct sk_buff *skb, |
3248 | const netdev_features_t features) | |
3249 | { | |
3250 | if (unlikely(skb->csum_not_inet)) | |
3251 | return !!(features & NETIF_F_SCTP_CRC) ? 0 : | |
3252 | skb_crc32c_csum_help(skb); | |
3253 | ||
3254 | return !!(features & NETIF_F_CSUM_MASK) ? 0 : skb_checksum_help(skb); | |
3255 | } | |
3256 | EXPORT_SYMBOL(skb_csum_hwoffload_help); | |
3257 | ||
f53c7239 | 3258 | static struct sk_buff *validate_xmit_skb(struct sk_buff *skb, struct net_device *dev, bool *again) |
eae3f88e DM |
3259 | { |
3260 | netdev_features_t features; | |
f6a78bfc | 3261 | |
eae3f88e DM |
3262 | features = netif_skb_features(skb); |
3263 | skb = validate_xmit_vlan(skb, features); | |
3264 | if (unlikely(!skb)) | |
3265 | goto out_null; | |
7b9c6090 | 3266 | |
ebf4e808 IL |
3267 | skb = sk_validate_xmit_skb(skb, dev); |
3268 | if (unlikely(!skb)) | |
3269 | goto out_null; | |
3270 | ||
8b86a61d | 3271 | if (netif_needs_gso(skb, features)) { |
ce93718f DM |
3272 | struct sk_buff *segs; |
3273 | ||
3274 | segs = skb_gso_segment(skb, features); | |
cecda693 | 3275 | if (IS_ERR(segs)) { |
af6dabc9 | 3276 | goto out_kfree_skb; |
cecda693 JW |
3277 | } else if (segs) { |
3278 | consume_skb(skb); | |
3279 | skb = segs; | |
f6a78bfc | 3280 | } |
eae3f88e DM |
3281 | } else { |
3282 | if (skb_needs_linearize(skb, features) && | |
3283 | __skb_linearize(skb)) | |
3284 | goto out_kfree_skb; | |
4ec93edb | 3285 | |
eae3f88e DM |
3286 | /* If packet is not checksummed and device does not |
3287 | * support checksumming for this protocol, complete | |
3288 | * checksumming here. | |
3289 | */ | |
3290 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
3291 | if (skb->encapsulation) | |
3292 | skb_set_inner_transport_header(skb, | |
3293 | skb_checksum_start_offset(skb)); | |
3294 | else | |
3295 | skb_set_transport_header(skb, | |
3296 | skb_checksum_start_offset(skb)); | |
43c26a1a | 3297 | if (skb_csum_hwoffload_help(skb, features)) |
eae3f88e | 3298 | goto out_kfree_skb; |
7b9c6090 | 3299 | } |
0c772159 | 3300 | } |
7b9c6090 | 3301 | |
f53c7239 | 3302 | skb = validate_xmit_xfrm(skb, features, again); |
3dca3f38 | 3303 | |
eae3f88e | 3304 | return skb; |
fc70fb64 | 3305 | |
f6a78bfc HX |
3306 | out_kfree_skb: |
3307 | kfree_skb(skb); | |
eae3f88e | 3308 | out_null: |
d21fd63e | 3309 | atomic_long_inc(&dev->tx_dropped); |
eae3f88e DM |
3310 | return NULL; |
3311 | } | |
6afff0ca | 3312 | |
f53c7239 | 3313 | struct sk_buff *validate_xmit_skb_list(struct sk_buff *skb, struct net_device *dev, bool *again) |
55a93b3e ED |
3314 | { |
3315 | struct sk_buff *next, *head = NULL, *tail; | |
3316 | ||
bec3cfdc | 3317 | for (; skb != NULL; skb = next) { |
55a93b3e | 3318 | next = skb->next; |
a8305bff | 3319 | skb_mark_not_on_list(skb); |
bec3cfdc ED |
3320 | |
3321 | /* in case skb wont be segmented, point to itself */ | |
3322 | skb->prev = skb; | |
3323 | ||
f53c7239 | 3324 | skb = validate_xmit_skb(skb, dev, again); |
bec3cfdc ED |
3325 | if (!skb) |
3326 | continue; | |
55a93b3e | 3327 | |
bec3cfdc ED |
3328 | if (!head) |
3329 | head = skb; | |
3330 | else | |
3331 | tail->next = skb; | |
3332 | /* If skb was segmented, skb->prev points to | |
3333 | * the last segment. If not, it still contains skb. | |
3334 | */ | |
3335 | tail = skb->prev; | |
55a93b3e ED |
3336 | } |
3337 | return head; | |
f6a78bfc | 3338 | } |
104ba78c | 3339 | EXPORT_SYMBOL_GPL(validate_xmit_skb_list); |
f6a78bfc | 3340 | |
1def9238 ED |
3341 | static void qdisc_pkt_len_init(struct sk_buff *skb) |
3342 | { | |
3343 | const struct skb_shared_info *shinfo = skb_shinfo(skb); | |
3344 | ||
3345 | qdisc_skb_cb(skb)->pkt_len = skb->len; | |
3346 | ||
3347 | /* To get more precise estimation of bytes sent on wire, | |
3348 | * we add to pkt_len the headers size of all segments | |
3349 | */ | |
a0dce875 | 3350 | if (shinfo->gso_size && skb_transport_header_was_set(skb)) { |
757b8b1d | 3351 | unsigned int hdr_len; |
15e5a030 | 3352 | u16 gso_segs = shinfo->gso_segs; |
1def9238 | 3353 | |
757b8b1d ED |
3354 | /* mac layer + network layer */ |
3355 | hdr_len = skb_transport_header(skb) - skb_mac_header(skb); | |
3356 | ||
3357 | /* + transport layer */ | |
7c68d1a6 ED |
3358 | if (likely(shinfo->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6))) { |
3359 | const struct tcphdr *th; | |
3360 | struct tcphdr _tcphdr; | |
3361 | ||
3362 | th = skb_header_pointer(skb, skb_transport_offset(skb), | |
3363 | sizeof(_tcphdr), &_tcphdr); | |
3364 | if (likely(th)) | |
3365 | hdr_len += __tcp_hdrlen(th); | |
3366 | } else { | |
3367 | struct udphdr _udphdr; | |
3368 | ||
3369 | if (skb_header_pointer(skb, skb_transport_offset(skb), | |
3370 | sizeof(_udphdr), &_udphdr)) | |
3371 | hdr_len += sizeof(struct udphdr); | |
3372 | } | |
15e5a030 JW |
3373 | |
3374 | if (shinfo->gso_type & SKB_GSO_DODGY) | |
3375 | gso_segs = DIV_ROUND_UP(skb->len - hdr_len, | |
3376 | shinfo->gso_size); | |
3377 | ||
3378 | qdisc_skb_cb(skb)->pkt_len += (gso_segs - 1) * hdr_len; | |
1def9238 ED |
3379 | } |
3380 | } | |
3381 | ||
bbd8a0d3 KK |
3382 | static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q, |
3383 | struct net_device *dev, | |
3384 | struct netdev_queue *txq) | |
3385 | { | |
3386 | spinlock_t *root_lock = qdisc_lock(q); | |
520ac30f | 3387 | struct sk_buff *to_free = NULL; |
a2da570d | 3388 | bool contended; |
bbd8a0d3 KK |
3389 | int rc; |
3390 | ||
a2da570d | 3391 | qdisc_calculate_pkt_len(skb, q); |
6b3ba914 JF |
3392 | |
3393 | if (q->flags & TCQ_F_NOLOCK) { | |
3a5c0c20 | 3394 | rc = q->enqueue(skb, q, &to_free) & NET_XMIT_MASK; |
63634e2c YL |
3395 | if (likely(!netif_xmit_frozen_or_stopped(txq))) |
3396 | qdisc_run(q); | |
6b3ba914 JF |
3397 | |
3398 | if (unlikely(to_free)) | |
3399 | kfree_skb_list(to_free); | |
3400 | return rc; | |
3401 | } | |
3402 | ||
79640a4c ED |
3403 | /* |
3404 | * Heuristic to force contended enqueues to serialize on a | |
3405 | * separate lock before trying to get qdisc main lock. | |
f9eb8aea | 3406 | * This permits qdisc->running owner to get the lock more |
9bf2b8c2 | 3407 | * often and dequeue packets faster. |
79640a4c | 3408 | */ |
a2da570d | 3409 | contended = qdisc_is_running(q); |
79640a4c ED |
3410 | if (unlikely(contended)) |
3411 | spin_lock(&q->busylock); | |
3412 | ||
bbd8a0d3 KK |
3413 | spin_lock(root_lock); |
3414 | if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) { | |
520ac30f | 3415 | __qdisc_drop(skb, &to_free); |
bbd8a0d3 KK |
3416 | rc = NET_XMIT_DROP; |
3417 | } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) && | |
bc135b23 | 3418 | qdisc_run_begin(q)) { |
bbd8a0d3 KK |
3419 | /* |
3420 | * This is a work-conserving queue; there are no old skbs | |
3421 | * waiting to be sent out; and the qdisc is not running - | |
3422 | * xmit the skb directly. | |
3423 | */ | |
bfe0d029 | 3424 | |
bfe0d029 ED |
3425 | qdisc_bstats_update(q, skb); |
3426 | ||
55a93b3e | 3427 | if (sch_direct_xmit(skb, q, dev, txq, root_lock, true)) { |
79640a4c ED |
3428 | if (unlikely(contended)) { |
3429 | spin_unlock(&q->busylock); | |
3430 | contended = false; | |
3431 | } | |
bbd8a0d3 | 3432 | __qdisc_run(q); |
6c148184 | 3433 | } |
bbd8a0d3 | 3434 | |
6c148184 | 3435 | qdisc_run_end(q); |
bbd8a0d3 KK |
3436 | rc = NET_XMIT_SUCCESS; |
3437 | } else { | |
520ac30f | 3438 | rc = q->enqueue(skb, q, &to_free) & NET_XMIT_MASK; |
79640a4c ED |
3439 | if (qdisc_run_begin(q)) { |
3440 | if (unlikely(contended)) { | |
3441 | spin_unlock(&q->busylock); | |
3442 | contended = false; | |
3443 | } | |
3444 | __qdisc_run(q); | |
6c148184 | 3445 | qdisc_run_end(q); |
79640a4c | 3446 | } |
bbd8a0d3 KK |
3447 | } |
3448 | spin_unlock(root_lock); | |
520ac30f ED |
3449 | if (unlikely(to_free)) |
3450 | kfree_skb_list(to_free); | |
79640a4c ED |
3451 | if (unlikely(contended)) |
3452 | spin_unlock(&q->busylock); | |
bbd8a0d3 KK |
3453 | return rc; |
3454 | } | |
3455 | ||
86f8515f | 3456 | #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO) |
5bc1421e NH |
3457 | static void skb_update_prio(struct sk_buff *skb) |
3458 | { | |
4dcb31d4 ED |
3459 | const struct netprio_map *map; |
3460 | const struct sock *sk; | |
3461 | unsigned int prioidx; | |
5bc1421e | 3462 | |
4dcb31d4 ED |
3463 | if (skb->priority) |
3464 | return; | |
3465 | map = rcu_dereference_bh(skb->dev->priomap); | |
3466 | if (!map) | |
3467 | return; | |
3468 | sk = skb_to_full_sk(skb); | |
3469 | if (!sk) | |
3470 | return; | |
91c68ce2 | 3471 | |
4dcb31d4 ED |
3472 | prioidx = sock_cgroup_prioidx(&sk->sk_cgrp_data); |
3473 | ||
3474 | if (prioidx < map->priomap_len) | |
3475 | skb->priority = map->priomap[prioidx]; | |
5bc1421e NH |
3476 | } |
3477 | #else | |
3478 | #define skb_update_prio(skb) | |
3479 | #endif | |
3480 | ||
95603e22 MM |
3481 | /** |
3482 | * dev_loopback_xmit - loop back @skb | |
0c4b51f0 EB |
3483 | * @net: network namespace this loopback is happening in |
3484 | * @sk: sk needed to be a netfilter okfn | |
95603e22 MM |
3485 | * @skb: buffer to transmit |
3486 | */ | |
0c4b51f0 | 3487 | int dev_loopback_xmit(struct net *net, struct sock *sk, struct sk_buff *skb) |
95603e22 MM |
3488 | { |
3489 | skb_reset_mac_header(skb); | |
3490 | __skb_pull(skb, skb_network_offset(skb)); | |
3491 | skb->pkt_type = PACKET_LOOPBACK; | |
8c4f2bcb CS |
3492 | if (skb->ip_summed == CHECKSUM_NONE) |
3493 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
95603e22 MM |
3494 | WARN_ON(!skb_dst(skb)); |
3495 | skb_dst_force(skb); | |
3496 | netif_rx_ni(skb); | |
3497 | return 0; | |
3498 | } | |
3499 | EXPORT_SYMBOL(dev_loopback_xmit); | |
3500 | ||
1f211a1b DB |
3501 | #ifdef CONFIG_NET_EGRESS |
3502 | static struct sk_buff * | |
3503 | sch_handle_egress(struct sk_buff *skb, int *ret, struct net_device *dev) | |
3504 | { | |
46209401 | 3505 | struct mini_Qdisc *miniq = rcu_dereference_bh(dev->miniq_egress); |
1f211a1b DB |
3506 | struct tcf_result cl_res; |
3507 | ||
46209401 | 3508 | if (!miniq) |
1f211a1b DB |
3509 | return skb; |
3510 | ||
8dc07fdb | 3511 | /* qdisc_skb_cb(skb)->pkt_len was already set by the caller. */ |
46209401 | 3512 | mini_qdisc_bstats_cpu_update(miniq, skb); |
1f211a1b | 3513 | |
46209401 | 3514 | switch (tcf_classify(skb, miniq->filter_list, &cl_res, false)) { |
1f211a1b DB |
3515 | case TC_ACT_OK: |
3516 | case TC_ACT_RECLASSIFY: | |
3517 | skb->tc_index = TC_H_MIN(cl_res.classid); | |
3518 | break; | |
3519 | case TC_ACT_SHOT: | |
46209401 | 3520 | mini_qdisc_qstats_cpu_drop(miniq); |
1f211a1b | 3521 | *ret = NET_XMIT_DROP; |
7e2c3aea DB |
3522 | kfree_skb(skb); |
3523 | return NULL; | |
1f211a1b DB |
3524 | case TC_ACT_STOLEN: |
3525 | case TC_ACT_QUEUED: | |
e25ea21f | 3526 | case TC_ACT_TRAP: |
1f211a1b | 3527 | *ret = NET_XMIT_SUCCESS; |
7e2c3aea | 3528 | consume_skb(skb); |
1f211a1b DB |
3529 | return NULL; |
3530 | case TC_ACT_REDIRECT: | |
3531 | /* No need to push/pop skb's mac_header here on egress! */ | |
3532 | skb_do_redirect(skb); | |
3533 | *ret = NET_XMIT_SUCCESS; | |
3534 | return NULL; | |
3535 | default: | |
3536 | break; | |
3537 | } | |
3538 | ||
3539 | return skb; | |
3540 | } | |
3541 | #endif /* CONFIG_NET_EGRESS */ | |
3542 | ||
fc9bab24 AN |
3543 | #ifdef CONFIG_XPS |
3544 | static int __get_xps_queue_idx(struct net_device *dev, struct sk_buff *skb, | |
3545 | struct xps_dev_maps *dev_maps, unsigned int tci) | |
3546 | { | |
3547 | struct xps_map *map; | |
3548 | int queue_index = -1; | |
3549 | ||
3550 | if (dev->num_tc) { | |
3551 | tci *= dev->num_tc; | |
3552 | tci += netdev_get_prio_tc_map(dev, skb->priority); | |
3553 | } | |
3554 | ||
3555 | map = rcu_dereference(dev_maps->attr_map[tci]); | |
3556 | if (map) { | |
3557 | if (map->len == 1) | |
3558 | queue_index = map->queues[0]; | |
3559 | else | |
3560 | queue_index = map->queues[reciprocal_scale( | |
3561 | skb_get_hash(skb), map->len)]; | |
3562 | if (unlikely(queue_index >= dev->real_num_tx_queues)) | |
3563 | queue_index = -1; | |
3564 | } | |
3565 | return queue_index; | |
3566 | } | |
3567 | #endif | |
3568 | ||
eadec877 AD |
3569 | static int get_xps_queue(struct net_device *dev, struct net_device *sb_dev, |
3570 | struct sk_buff *skb) | |
638b2a69 JP |
3571 | { |
3572 | #ifdef CONFIG_XPS | |
3573 | struct xps_dev_maps *dev_maps; | |
fc9bab24 | 3574 | struct sock *sk = skb->sk; |
638b2a69 JP |
3575 | int queue_index = -1; |
3576 | ||
04157469 AN |
3577 | if (!static_key_false(&xps_needed)) |
3578 | return -1; | |
3579 | ||
638b2a69 | 3580 | rcu_read_lock(); |
fc9bab24 AN |
3581 | if (!static_key_false(&xps_rxqs_needed)) |
3582 | goto get_cpus_map; | |
3583 | ||
eadec877 | 3584 | dev_maps = rcu_dereference(sb_dev->xps_rxqs_map); |
638b2a69 | 3585 | if (dev_maps) { |
fc9bab24 | 3586 | int tci = sk_rx_queue_get(sk); |
184c449f | 3587 | |
fc9bab24 AN |
3588 | if (tci >= 0 && tci < dev->num_rx_queues) |
3589 | queue_index = __get_xps_queue_idx(dev, skb, dev_maps, | |
3590 | tci); | |
3591 | } | |
184c449f | 3592 | |
fc9bab24 AN |
3593 | get_cpus_map: |
3594 | if (queue_index < 0) { | |
eadec877 | 3595 | dev_maps = rcu_dereference(sb_dev->xps_cpus_map); |
fc9bab24 AN |
3596 | if (dev_maps) { |
3597 | unsigned int tci = skb->sender_cpu - 1; | |
3598 | ||
3599 | queue_index = __get_xps_queue_idx(dev, skb, dev_maps, | |
3600 | tci); | |
638b2a69 JP |
3601 | } |
3602 | } | |
3603 | rcu_read_unlock(); | |
3604 | ||
3605 | return queue_index; | |
3606 | #else | |
3607 | return -1; | |
3608 | #endif | |
3609 | } | |
3610 | ||
a4ea8a3d | 3611 | u16 dev_pick_tx_zero(struct net_device *dev, struct sk_buff *skb, |
a350ecce | 3612 | struct net_device *sb_dev) |
a4ea8a3d AD |
3613 | { |
3614 | return 0; | |
3615 | } | |
3616 | EXPORT_SYMBOL(dev_pick_tx_zero); | |
3617 | ||
3618 | u16 dev_pick_tx_cpu_id(struct net_device *dev, struct sk_buff *skb, | |
a350ecce | 3619 | struct net_device *sb_dev) |
a4ea8a3d AD |
3620 | { |
3621 | return (u16)raw_smp_processor_id() % dev->real_num_tx_queues; | |
3622 | } | |
3623 | EXPORT_SYMBOL(dev_pick_tx_cpu_id); | |
3624 | ||
b71b5837 PA |
3625 | u16 netdev_pick_tx(struct net_device *dev, struct sk_buff *skb, |
3626 | struct net_device *sb_dev) | |
638b2a69 JP |
3627 | { |
3628 | struct sock *sk = skb->sk; | |
3629 | int queue_index = sk_tx_queue_get(sk); | |
3630 | ||
eadec877 AD |
3631 | sb_dev = sb_dev ? : dev; |
3632 | ||
638b2a69 JP |
3633 | if (queue_index < 0 || skb->ooo_okay || |
3634 | queue_index >= dev->real_num_tx_queues) { | |
eadec877 | 3635 | int new_index = get_xps_queue(dev, sb_dev, skb); |
f4563a75 | 3636 | |
638b2a69 | 3637 | if (new_index < 0) |
eadec877 | 3638 | new_index = skb_tx_hash(dev, sb_dev, skb); |
638b2a69 JP |
3639 | |
3640 | if (queue_index != new_index && sk && | |
004a5d01 | 3641 | sk_fullsock(sk) && |
638b2a69 JP |
3642 | rcu_access_pointer(sk->sk_dst_cache)) |
3643 | sk_tx_queue_set(sk, new_index); | |
3644 | ||
3645 | queue_index = new_index; | |
3646 | } | |
3647 | ||
3648 | return queue_index; | |
3649 | } | |
b71b5837 | 3650 | EXPORT_SYMBOL(netdev_pick_tx); |
638b2a69 | 3651 | |
4bd97d51 PA |
3652 | struct netdev_queue *netdev_core_pick_tx(struct net_device *dev, |
3653 | struct sk_buff *skb, | |
3654 | struct net_device *sb_dev) | |
638b2a69 JP |
3655 | { |
3656 | int queue_index = 0; | |
3657 | ||
3658 | #ifdef CONFIG_XPS | |
52bd2d62 ED |
3659 | u32 sender_cpu = skb->sender_cpu - 1; |
3660 | ||
3661 | if (sender_cpu >= (u32)NR_CPUS) | |
638b2a69 JP |
3662 | skb->sender_cpu = raw_smp_processor_id() + 1; |
3663 | #endif | |
3664 | ||
3665 | if (dev->real_num_tx_queues != 1) { | |
3666 | const struct net_device_ops *ops = dev->netdev_ops; | |
f4563a75 | 3667 | |
638b2a69 | 3668 | if (ops->ndo_select_queue) |
a350ecce | 3669 | queue_index = ops->ndo_select_queue(dev, skb, sb_dev); |
638b2a69 | 3670 | else |
4bd97d51 | 3671 | queue_index = netdev_pick_tx(dev, skb, sb_dev); |
638b2a69 | 3672 | |
d584527c | 3673 | queue_index = netdev_cap_txqueue(dev, queue_index); |
638b2a69 JP |
3674 | } |
3675 | ||
3676 | skb_set_queue_mapping(skb, queue_index); | |
3677 | return netdev_get_tx_queue(dev, queue_index); | |
3678 | } | |
3679 | ||
d29f749e | 3680 | /** |
9d08dd3d | 3681 | * __dev_queue_xmit - transmit a buffer |
d29f749e | 3682 | * @skb: buffer to transmit |
eadec877 | 3683 | * @sb_dev: suboordinate device used for L2 forwarding offload |
d29f749e DJ |
3684 | * |
3685 | * Queue a buffer for transmission to a network device. The caller must | |
3686 | * have set the device and priority and built the buffer before calling | |
3687 | * this function. The function can be called from an interrupt. | |
3688 | * | |
3689 | * A negative errno code is returned on a failure. A success does not | |
3690 | * guarantee the frame will be transmitted as it may be dropped due | |
3691 | * to congestion or traffic shaping. | |
3692 | * | |
3693 | * ----------------------------------------------------------------------------------- | |
3694 | * I notice this method can also return errors from the queue disciplines, | |
3695 | * including NET_XMIT_DROP, which is a positive value. So, errors can also | |
3696 | * be positive. | |
3697 | * | |
3698 | * Regardless of the return value, the skb is consumed, so it is currently | |
3699 | * difficult to retry a send to this method. (You can bump the ref count | |
3700 | * before sending to hold a reference for retry if you are careful.) | |
3701 | * | |
3702 | * When calling this method, interrupts MUST be enabled. This is because | |
3703 | * the BH enable code must have IRQs enabled so that it will not deadlock. | |
3704 | * --BLG | |
3705 | */ | |
eadec877 | 3706 | static int __dev_queue_xmit(struct sk_buff *skb, struct net_device *sb_dev) |
1da177e4 LT |
3707 | { |
3708 | struct net_device *dev = skb->dev; | |
dc2b4847 | 3709 | struct netdev_queue *txq; |
1da177e4 LT |
3710 | struct Qdisc *q; |
3711 | int rc = -ENOMEM; | |
f53c7239 | 3712 | bool again = false; |
1da177e4 | 3713 | |
6d1ccff6 ED |
3714 | skb_reset_mac_header(skb); |
3715 | ||
e7fd2885 WB |
3716 | if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_SCHED_TSTAMP)) |
3717 | __skb_tstamp_tx(skb, NULL, skb->sk, SCM_TSTAMP_SCHED); | |
3718 | ||
4ec93edb YH |
3719 | /* Disable soft irqs for various locks below. Also |
3720 | * stops preemption for RCU. | |
1da177e4 | 3721 | */ |
4ec93edb | 3722 | rcu_read_lock_bh(); |
1da177e4 | 3723 | |
5bc1421e NH |
3724 | skb_update_prio(skb); |
3725 | ||
1f211a1b DB |
3726 | qdisc_pkt_len_init(skb); |
3727 | #ifdef CONFIG_NET_CLS_ACT | |
8dc07fdb | 3728 | skb->tc_at_ingress = 0; |
1f211a1b | 3729 | # ifdef CONFIG_NET_EGRESS |
aabf6772 | 3730 | if (static_branch_unlikely(&egress_needed_key)) { |
1f211a1b DB |
3731 | skb = sch_handle_egress(skb, &rc, dev); |
3732 | if (!skb) | |
3733 | goto out; | |
3734 | } | |
3735 | # endif | |
3736 | #endif | |
02875878 ED |
3737 | /* If device/qdisc don't need skb->dst, release it right now while |
3738 | * its hot in this cpu cache. | |
3739 | */ | |
3740 | if (dev->priv_flags & IFF_XMIT_DST_RELEASE) | |
3741 | skb_dst_drop(skb); | |
3742 | else | |
3743 | skb_dst_force(skb); | |
3744 | ||
4bd97d51 | 3745 | txq = netdev_core_pick_tx(dev, skb, sb_dev); |
a898def2 | 3746 | q = rcu_dereference_bh(txq->qdisc); |
37437bb2 | 3747 | |
cf66ba58 | 3748 | trace_net_dev_queue(skb); |
1da177e4 | 3749 | if (q->enqueue) { |
bbd8a0d3 | 3750 | rc = __dev_xmit_skb(skb, q, dev, txq); |
37437bb2 | 3751 | goto out; |
1da177e4 LT |
3752 | } |
3753 | ||
3754 | /* The device has no queue. Common case for software devices: | |
eb13da1a | 3755 | * loopback, all the sorts of tunnels... |
1da177e4 | 3756 | |
eb13da1a | 3757 | * Really, it is unlikely that netif_tx_lock protection is necessary |
3758 | * here. (f.e. loopback and IP tunnels are clean ignoring statistics | |
3759 | * counters.) | |
3760 | * However, it is possible, that they rely on protection | |
3761 | * made by us here. | |
1da177e4 | 3762 | |
eb13da1a | 3763 | * Check this and shot the lock. It is not prone from deadlocks. |
3764 | *Either shot noqueue qdisc, it is even simpler 8) | |
1da177e4 LT |
3765 | */ |
3766 | if (dev->flags & IFF_UP) { | |
3767 | int cpu = smp_processor_id(); /* ok because BHs are off */ | |
3768 | ||
2f4dfad2 ED |
3769 | /* Other cpus might concurrently change txq->xmit_lock_owner |
3770 | * to -1 or to their cpu id, but not to our id. | |
3771 | */ | |
3772 | if (READ_ONCE(txq->xmit_lock_owner) != cpu) { | |
97cdcf37 | 3773 | if (dev_xmit_recursion()) |
745e20f1 ED |
3774 | goto recursion_alert; |
3775 | ||
f53c7239 | 3776 | skb = validate_xmit_skb(skb, dev, &again); |
1f59533f | 3777 | if (!skb) |
d21fd63e | 3778 | goto out; |
1f59533f | 3779 | |
c773e847 | 3780 | HARD_TX_LOCK(dev, txq, cpu); |
1da177e4 | 3781 | |
73466498 | 3782 | if (!netif_xmit_stopped(txq)) { |
97cdcf37 | 3783 | dev_xmit_recursion_inc(); |
ce93718f | 3784 | skb = dev_hard_start_xmit(skb, dev, txq, &rc); |
97cdcf37 | 3785 | dev_xmit_recursion_dec(); |
572a9d7b | 3786 | if (dev_xmit_complete(rc)) { |
c773e847 | 3787 | HARD_TX_UNLOCK(dev, txq); |
1da177e4 LT |
3788 | goto out; |
3789 | } | |
3790 | } | |
c773e847 | 3791 | HARD_TX_UNLOCK(dev, txq); |
e87cc472 JP |
3792 | net_crit_ratelimited("Virtual device %s asks to queue packet!\n", |
3793 | dev->name); | |
1da177e4 LT |
3794 | } else { |
3795 | /* Recursion is detected! It is possible, | |
745e20f1 ED |
3796 | * unfortunately |
3797 | */ | |
3798 | recursion_alert: | |
e87cc472 JP |
3799 | net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n", |
3800 | dev->name); | |
1da177e4 LT |
3801 | } |
3802 | } | |
3803 | ||
3804 | rc = -ENETDOWN; | |
d4828d85 | 3805 | rcu_read_unlock_bh(); |
1da177e4 | 3806 | |
015f0688 | 3807 | atomic_long_inc(&dev->tx_dropped); |
1f59533f | 3808 | kfree_skb_list(skb); |
1da177e4 LT |
3809 | return rc; |
3810 | out: | |
d4828d85 | 3811 | rcu_read_unlock_bh(); |
1da177e4 LT |
3812 | return rc; |
3813 | } | |
f663dd9a | 3814 | |
2b4aa3ce | 3815 | int dev_queue_xmit(struct sk_buff *skb) |
f663dd9a JW |
3816 | { |
3817 | return __dev_queue_xmit(skb, NULL); | |
3818 | } | |
2b4aa3ce | 3819 | EXPORT_SYMBOL(dev_queue_xmit); |
1da177e4 | 3820 | |
eadec877 | 3821 | int dev_queue_xmit_accel(struct sk_buff *skb, struct net_device *sb_dev) |
f663dd9a | 3822 | { |
eadec877 | 3823 | return __dev_queue_xmit(skb, sb_dev); |
f663dd9a JW |
3824 | } |
3825 | EXPORT_SYMBOL(dev_queue_xmit_accel); | |
3826 | ||
865b03f2 MK |
3827 | int dev_direct_xmit(struct sk_buff *skb, u16 queue_id) |
3828 | { | |
3829 | struct net_device *dev = skb->dev; | |
3830 | struct sk_buff *orig_skb = skb; | |
3831 | struct netdev_queue *txq; | |
3832 | int ret = NETDEV_TX_BUSY; | |
3833 | bool again = false; | |
3834 | ||
3835 | if (unlikely(!netif_running(dev) || | |
3836 | !netif_carrier_ok(dev))) | |
3837 | goto drop; | |
3838 | ||
3839 | skb = validate_xmit_skb_list(skb, dev, &again); | |
3840 | if (skb != orig_skb) | |
3841 | goto drop; | |
3842 | ||
3843 | skb_set_queue_mapping(skb, queue_id); | |
3844 | txq = skb_get_tx_queue(dev, skb); | |
3845 | ||
3846 | local_bh_disable(); | |
3847 | ||
00653127 | 3848 | dev_xmit_recursion_inc(); |
865b03f2 MK |
3849 | HARD_TX_LOCK(dev, txq, smp_processor_id()); |
3850 | if (!netif_xmit_frozen_or_drv_stopped(txq)) | |
3851 | ret = netdev_start_xmit(skb, dev, txq, false); | |
3852 | HARD_TX_UNLOCK(dev, txq); | |
00653127 | 3853 | dev_xmit_recursion_dec(); |
865b03f2 MK |
3854 | |
3855 | local_bh_enable(); | |
3856 | ||
3857 | if (!dev_xmit_complete(ret)) | |
3858 | kfree_skb(skb); | |
3859 | ||
3860 | return ret; | |
3861 | drop: | |
3862 | atomic_long_inc(&dev->tx_dropped); | |
3863 | kfree_skb_list(skb); | |
3864 | return NET_XMIT_DROP; | |
3865 | } | |
3866 | EXPORT_SYMBOL(dev_direct_xmit); | |
1da177e4 | 3867 | |
eb13da1a | 3868 | /************************************************************************* |
3869 | * Receiver routines | |
3870 | *************************************************************************/ | |
1da177e4 | 3871 | |
6b2bedc3 | 3872 | int netdev_max_backlog __read_mostly = 1000; |
c9e6bc64 ED |
3873 | EXPORT_SYMBOL(netdev_max_backlog); |
3874 | ||
3b098e2d | 3875 | int netdev_tstamp_prequeue __read_mostly = 1; |
6b2bedc3 | 3876 | int netdev_budget __read_mostly = 300; |
c9a1e13e KK |
3877 | /* Must be at least 2 jiffes to guarantee 1 jiffy timeout */ |
3878 | unsigned int __read_mostly netdev_budget_usecs = 2 * USEC_PER_SEC / HZ; | |
3d48b53f MT |
3879 | int weight_p __read_mostly = 64; /* old backlog weight */ |
3880 | int dev_weight_rx_bias __read_mostly = 1; /* bias for backlog weight */ | |
3881 | int dev_weight_tx_bias __read_mostly = 1; /* bias for output_queue quota */ | |
3882 | int dev_rx_weight __read_mostly = 64; | |
3883 | int dev_tx_weight __read_mostly = 64; | |
323ebb61 EC |
3884 | /* Maximum number of GRO_NORMAL skbs to batch up for list-RX */ |
3885 | int gro_normal_batch __read_mostly = 8; | |
1da177e4 | 3886 | |
eecfd7c4 ED |
3887 | /* Called with irq disabled */ |
3888 | static inline void ____napi_schedule(struct softnet_data *sd, | |
3889 | struct napi_struct *napi) | |
3890 | { | |
3891 | list_add_tail(&napi->poll_list, &sd->poll_list); | |
3892 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); | |
3893 | } | |
3894 | ||
bfb564e7 KK |
3895 | #ifdef CONFIG_RPS |
3896 | ||
3897 | /* One global table that all flow-based protocols share. */ | |
6e3f7faf | 3898 | struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly; |
bfb564e7 | 3899 | EXPORT_SYMBOL(rps_sock_flow_table); |
567e4b79 ED |
3900 | u32 rps_cpu_mask __read_mostly; |
3901 | EXPORT_SYMBOL(rps_cpu_mask); | |
bfb564e7 | 3902 | |
dc05360f | 3903 | struct static_key_false rps_needed __read_mostly; |
3df97ba8 | 3904 | EXPORT_SYMBOL(rps_needed); |
dc05360f | 3905 | struct static_key_false rfs_needed __read_mostly; |
13bfff25 | 3906 | EXPORT_SYMBOL(rfs_needed); |
adc9300e | 3907 | |
c445477d BH |
3908 | static struct rps_dev_flow * |
3909 | set_rps_cpu(struct net_device *dev, struct sk_buff *skb, | |
3910 | struct rps_dev_flow *rflow, u16 next_cpu) | |
3911 | { | |
a31196b0 | 3912 | if (next_cpu < nr_cpu_ids) { |
c445477d BH |
3913 | #ifdef CONFIG_RFS_ACCEL |
3914 | struct netdev_rx_queue *rxqueue; | |
3915 | struct rps_dev_flow_table *flow_table; | |
3916 | struct rps_dev_flow *old_rflow; | |
3917 | u32 flow_id; | |
3918 | u16 rxq_index; | |
3919 | int rc; | |
3920 | ||
3921 | /* Should we steer this flow to a different hardware queue? */ | |
69a19ee6 BH |
3922 | if (!skb_rx_queue_recorded(skb) || !dev->rx_cpu_rmap || |
3923 | !(dev->features & NETIF_F_NTUPLE)) | |
c445477d BH |
3924 | goto out; |
3925 | rxq_index = cpu_rmap_lookup_index(dev->rx_cpu_rmap, next_cpu); | |
3926 | if (rxq_index == skb_get_rx_queue(skb)) | |
3927 | goto out; | |
3928 | ||
3929 | rxqueue = dev->_rx + rxq_index; | |
3930 | flow_table = rcu_dereference(rxqueue->rps_flow_table); | |
3931 | if (!flow_table) | |
3932 | goto out; | |
61b905da | 3933 | flow_id = skb_get_hash(skb) & flow_table->mask; |
c445477d BH |
3934 | rc = dev->netdev_ops->ndo_rx_flow_steer(dev, skb, |
3935 | rxq_index, flow_id); | |
3936 | if (rc < 0) | |
3937 | goto out; | |
3938 | old_rflow = rflow; | |
3939 | rflow = &flow_table->flows[flow_id]; | |
c445477d BH |
3940 | rflow->filter = rc; |
3941 | if (old_rflow->filter == rflow->filter) | |
3942 | old_rflow->filter = RPS_NO_FILTER; | |
3943 | out: | |
3944 | #endif | |
3945 | rflow->last_qtail = | |
09994d1b | 3946 | per_cpu(softnet_data, next_cpu).input_queue_head; |
c445477d BH |
3947 | } |
3948 | ||
09994d1b | 3949 | rflow->cpu = next_cpu; |
c445477d BH |
3950 | return rflow; |
3951 | } | |
3952 | ||
bfb564e7 KK |
3953 | /* |
3954 | * get_rps_cpu is called from netif_receive_skb and returns the target | |
3955 | * CPU from the RPS map of the receiving queue for a given skb. | |
3956 | * rcu_read_lock must be held on entry. | |
3957 | */ | |
3958 | static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb, | |
3959 | struct rps_dev_flow **rflowp) | |
3960 | { | |
567e4b79 ED |
3961 | const struct rps_sock_flow_table *sock_flow_table; |
3962 | struct netdev_rx_queue *rxqueue = dev->_rx; | |
bfb564e7 | 3963 | struct rps_dev_flow_table *flow_table; |
567e4b79 | 3964 | struct rps_map *map; |
bfb564e7 | 3965 | int cpu = -1; |
567e4b79 | 3966 | u32 tcpu; |
61b905da | 3967 | u32 hash; |
bfb564e7 KK |
3968 | |
3969 | if (skb_rx_queue_recorded(skb)) { | |
3970 | u16 index = skb_get_rx_queue(skb); | |
567e4b79 | 3971 | |
62fe0b40 BH |
3972 | if (unlikely(index >= dev->real_num_rx_queues)) { |
3973 | WARN_ONCE(dev->real_num_rx_queues > 1, | |
3974 | "%s received packet on queue %u, but number " | |
3975 | "of RX queues is %u\n", | |
3976 | dev->name, index, dev->real_num_rx_queues); | |
bfb564e7 KK |
3977 | goto done; |
3978 | } | |
567e4b79 ED |
3979 | rxqueue += index; |
3980 | } | |
bfb564e7 | 3981 | |
567e4b79 ED |
3982 | /* Avoid computing hash if RFS/RPS is not active for this rxqueue */ |
3983 | ||
3984 | flow_table = rcu_dereference(rxqueue->rps_flow_table); | |
6e3f7faf | 3985 | map = rcu_dereference(rxqueue->rps_map); |
567e4b79 | 3986 | if (!flow_table && !map) |
bfb564e7 KK |
3987 | goto done; |
3988 | ||
2d47b459 | 3989 | skb_reset_network_header(skb); |
61b905da TH |
3990 | hash = skb_get_hash(skb); |
3991 | if (!hash) | |
bfb564e7 KK |
3992 | goto done; |
3993 | ||
fec5e652 TH |
3994 | sock_flow_table = rcu_dereference(rps_sock_flow_table); |
3995 | if (flow_table && sock_flow_table) { | |
fec5e652 | 3996 | struct rps_dev_flow *rflow; |
567e4b79 ED |
3997 | u32 next_cpu; |
3998 | u32 ident; | |
3999 | ||
4000 | /* First check into global flow table if there is a match */ | |
4001 | ident = sock_flow_table->ents[hash & sock_flow_table->mask]; | |
4002 | if ((ident ^ hash) & ~rps_cpu_mask) | |
4003 | goto try_rps; | |
fec5e652 | 4004 | |
567e4b79 ED |
4005 | next_cpu = ident & rps_cpu_mask; |
4006 | ||
4007 | /* OK, now we know there is a match, | |
4008 | * we can look at the local (per receive queue) flow table | |
4009 | */ | |
61b905da | 4010 | rflow = &flow_table->flows[hash & flow_table->mask]; |
fec5e652 TH |
4011 | tcpu = rflow->cpu; |
4012 | ||
fec5e652 TH |
4013 | /* |
4014 | * If the desired CPU (where last recvmsg was done) is | |
4015 | * different from current CPU (one in the rx-queue flow | |
4016 | * table entry), switch if one of the following holds: | |
a31196b0 | 4017 | * - Current CPU is unset (>= nr_cpu_ids). |
fec5e652 TH |
4018 | * - Current CPU is offline. |
4019 | * - The current CPU's queue tail has advanced beyond the | |
4020 | * last packet that was enqueued using this table entry. | |
4021 | * This guarantees that all previous packets for the flow | |
4022 | * have been dequeued, thus preserving in order delivery. | |
4023 | */ | |
4024 | if (unlikely(tcpu != next_cpu) && | |
a31196b0 | 4025 | (tcpu >= nr_cpu_ids || !cpu_online(tcpu) || |
fec5e652 | 4026 | ((int)(per_cpu(softnet_data, tcpu).input_queue_head - |
baefa31d TH |
4027 | rflow->last_qtail)) >= 0)) { |
4028 | tcpu = next_cpu; | |
c445477d | 4029 | rflow = set_rps_cpu(dev, skb, rflow, next_cpu); |
baefa31d | 4030 | } |
c445477d | 4031 | |
a31196b0 | 4032 | if (tcpu < nr_cpu_ids && cpu_online(tcpu)) { |
fec5e652 TH |
4033 | *rflowp = rflow; |
4034 | cpu = tcpu; | |
4035 | goto done; | |
4036 | } | |
4037 | } | |
4038 | ||
567e4b79 ED |
4039 | try_rps: |
4040 | ||
0a9627f2 | 4041 | if (map) { |
8fc54f68 | 4042 | tcpu = map->cpus[reciprocal_scale(hash, map->len)]; |
0a9627f2 TH |
4043 | if (cpu_online(tcpu)) { |
4044 | cpu = tcpu; | |
4045 | goto done; | |
4046 | } | |
4047 | } | |
4048 | ||
4049 | done: | |
0a9627f2 TH |
4050 | return cpu; |
4051 | } | |
4052 | ||
c445477d BH |
4053 | #ifdef CONFIG_RFS_ACCEL |
4054 | ||
4055 | /** | |
4056 | * rps_may_expire_flow - check whether an RFS hardware filter may be removed | |
4057 | * @dev: Device on which the filter was set | |
4058 | * @rxq_index: RX queue index | |
4059 | * @flow_id: Flow ID passed to ndo_rx_flow_steer() | |
4060 | * @filter_id: Filter ID returned by ndo_rx_flow_steer() | |
4061 | * | |
4062 | * Drivers that implement ndo_rx_flow_steer() should periodically call | |
4063 | * this function for each installed filter and remove the filters for | |
4064 | * which it returns %true. | |
4065 | */ | |
4066 | bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index, | |
4067 | u32 flow_id, u16 filter_id) | |
4068 | { | |
4069 | struct netdev_rx_queue *rxqueue = dev->_rx + rxq_index; | |
4070 | struct rps_dev_flow_table *flow_table; | |
4071 | struct rps_dev_flow *rflow; | |
4072 | bool expire = true; | |
a31196b0 | 4073 | unsigned int cpu; |
c445477d BH |
4074 | |
4075 | rcu_read_lock(); | |
4076 | flow_table = rcu_dereference(rxqueue->rps_flow_table); | |
4077 | if (flow_table && flow_id <= flow_table->mask) { | |
4078 | rflow = &flow_table->flows[flow_id]; | |
6aa7de05 | 4079 | cpu = READ_ONCE(rflow->cpu); |
a31196b0 | 4080 | if (rflow->filter == filter_id && cpu < nr_cpu_ids && |
c445477d BH |
4081 | ((int)(per_cpu(softnet_data, cpu).input_queue_head - |
4082 | rflow->last_qtail) < | |
4083 | (int)(10 * flow_table->mask))) | |
4084 | expire = false; | |
4085 | } | |
4086 | rcu_read_unlock(); | |
4087 | return expire; | |
4088 | } | |
4089 | EXPORT_SYMBOL(rps_may_expire_flow); | |
4090 | ||
4091 | #endif /* CONFIG_RFS_ACCEL */ | |
4092 | ||
0a9627f2 | 4093 | /* Called from hardirq (IPI) context */ |
e36fa2f7 | 4094 | static void rps_trigger_softirq(void *data) |
0a9627f2 | 4095 | { |
e36fa2f7 ED |
4096 | struct softnet_data *sd = data; |
4097 | ||
eecfd7c4 | 4098 | ____napi_schedule(sd, &sd->backlog); |
dee42870 | 4099 | sd->received_rps++; |
0a9627f2 | 4100 | } |
e36fa2f7 | 4101 | |
fec5e652 | 4102 | #endif /* CONFIG_RPS */ |
0a9627f2 | 4103 | |
e36fa2f7 ED |
4104 | /* |
4105 | * Check if this softnet_data structure is another cpu one | |
4106 | * If yes, queue it to our IPI list and return 1 | |
4107 | * If no, return 0 | |
4108 | */ | |
4109 | static int rps_ipi_queued(struct softnet_data *sd) | |
4110 | { | |
4111 | #ifdef CONFIG_RPS | |
903ceff7 | 4112 | struct softnet_data *mysd = this_cpu_ptr(&softnet_data); |
e36fa2f7 ED |
4113 | |
4114 | if (sd != mysd) { | |
4115 | sd->rps_ipi_next = mysd->rps_ipi_list; | |
4116 | mysd->rps_ipi_list = sd; | |
4117 | ||
4118 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); | |
4119 | return 1; | |
4120 | } | |
4121 | #endif /* CONFIG_RPS */ | |
4122 | return 0; | |
4123 | } | |
4124 | ||
99bbc707 WB |
4125 | #ifdef CONFIG_NET_FLOW_LIMIT |
4126 | int netdev_flow_limit_table_len __read_mostly = (1 << 12); | |
4127 | #endif | |
4128 | ||
4129 | static bool skb_flow_limit(struct sk_buff *skb, unsigned int qlen) | |
4130 | { | |
4131 | #ifdef CONFIG_NET_FLOW_LIMIT | |
4132 | struct sd_flow_limit *fl; | |
4133 | struct softnet_data *sd; | |
4134 | unsigned int old_flow, new_flow; | |
4135 | ||
4136 | if (qlen < (netdev_max_backlog >> 1)) | |
4137 | return false; | |
4138 | ||
903ceff7 | 4139 | sd = this_cpu_ptr(&softnet_data); |
99bbc707 WB |
4140 | |
4141 | rcu_read_lock(); | |
4142 | fl = rcu_dereference(sd->flow_limit); | |
4143 | if (fl) { | |
3958afa1 | 4144 | new_flow = skb_get_hash(skb) & (fl->num_buckets - 1); |
99bbc707 WB |
4145 | old_flow = fl->history[fl->history_head]; |
4146 | fl->history[fl->history_head] = new_flow; | |
4147 | ||
4148 | fl->history_head++; | |
4149 | fl->history_head &= FLOW_LIMIT_HISTORY - 1; | |
4150 | ||
4151 | if (likely(fl->buckets[old_flow])) | |
4152 | fl->buckets[old_flow]--; | |
4153 | ||
4154 | if (++fl->buckets[new_flow] > (FLOW_LIMIT_HISTORY >> 1)) { | |
4155 | fl->count++; | |
4156 | rcu_read_unlock(); | |
4157 | return true; | |
4158 | } | |
4159 | } | |
4160 | rcu_read_unlock(); | |
4161 | #endif | |
4162 | return false; | |
4163 | } | |
4164 | ||
0a9627f2 TH |
4165 | /* |
4166 | * enqueue_to_backlog is called to queue an skb to a per CPU backlog | |
4167 | * queue (may be a remote CPU queue). | |
4168 | */ | |
fec5e652 TH |
4169 | static int enqueue_to_backlog(struct sk_buff *skb, int cpu, |
4170 | unsigned int *qtail) | |
0a9627f2 | 4171 | { |
e36fa2f7 | 4172 | struct softnet_data *sd; |
0a9627f2 | 4173 | unsigned long flags; |
99bbc707 | 4174 | unsigned int qlen; |
0a9627f2 | 4175 | |
e36fa2f7 | 4176 | sd = &per_cpu(softnet_data, cpu); |
0a9627f2 TH |
4177 | |
4178 | local_irq_save(flags); | |
0a9627f2 | 4179 | |
e36fa2f7 | 4180 | rps_lock(sd); |
e9e4dd32 JA |
4181 | if (!netif_running(skb->dev)) |
4182 | goto drop; | |
99bbc707 WB |
4183 | qlen = skb_queue_len(&sd->input_pkt_queue); |
4184 | if (qlen <= netdev_max_backlog && !skb_flow_limit(skb, qlen)) { | |
e008f3f0 | 4185 | if (qlen) { |
0a9627f2 | 4186 | enqueue: |
e36fa2f7 | 4187 | __skb_queue_tail(&sd->input_pkt_queue, skb); |
76cc8b13 | 4188 | input_queue_tail_incr_save(sd, qtail); |
e36fa2f7 | 4189 | rps_unlock(sd); |
152102c7 | 4190 | local_irq_restore(flags); |
0a9627f2 TH |
4191 | return NET_RX_SUCCESS; |
4192 | } | |
4193 | ||
ebda37c2 ED |
4194 | /* Schedule NAPI for backlog device |
4195 | * We can use non atomic operation since we own the queue lock | |
4196 | */ | |
4197 | if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) { | |
e36fa2f7 | 4198 | if (!rps_ipi_queued(sd)) |
eecfd7c4 | 4199 | ____napi_schedule(sd, &sd->backlog); |
0a9627f2 TH |
4200 | } |
4201 | goto enqueue; | |
4202 | } | |
4203 | ||
e9e4dd32 | 4204 | drop: |
dee42870 | 4205 | sd->dropped++; |
e36fa2f7 | 4206 | rps_unlock(sd); |
0a9627f2 | 4207 | |
0a9627f2 TH |
4208 | local_irq_restore(flags); |
4209 | ||
caf586e5 | 4210 | atomic_long_inc(&skb->dev->rx_dropped); |
0a9627f2 TH |
4211 | kfree_skb(skb); |
4212 | return NET_RX_DROP; | |
4213 | } | |
1da177e4 | 4214 | |
e817f856 JDB |
4215 | static struct netdev_rx_queue *netif_get_rxqueue(struct sk_buff *skb) |
4216 | { | |
4217 | struct net_device *dev = skb->dev; | |
4218 | struct netdev_rx_queue *rxqueue; | |
4219 | ||
4220 | rxqueue = dev->_rx; | |
4221 | ||
4222 | if (skb_rx_queue_recorded(skb)) { | |
4223 | u16 index = skb_get_rx_queue(skb); | |
4224 | ||
4225 | if (unlikely(index >= dev->real_num_rx_queues)) { | |
4226 | WARN_ONCE(dev->real_num_rx_queues > 1, | |
4227 | "%s received packet on queue %u, but number " | |
4228 | "of RX queues is %u\n", | |
4229 | dev->name, index, dev->real_num_rx_queues); | |
4230 | ||
4231 | return rxqueue; /* Return first rxqueue */ | |
4232 | } | |
4233 | rxqueue += index; | |
4234 | } | |
4235 | return rxqueue; | |
4236 | } | |
4237 | ||
d4455169 | 4238 | static u32 netif_receive_generic_xdp(struct sk_buff *skb, |
02671e23 | 4239 | struct xdp_buff *xdp, |
d4455169 JF |
4240 | struct bpf_prog *xdp_prog) |
4241 | { | |
e817f856 | 4242 | struct netdev_rx_queue *rxqueue; |
198d83bb | 4243 | void *orig_data, *orig_data_end; |
de8f3a83 | 4244 | u32 metalen, act = XDP_DROP; |
29724956 JDB |
4245 | __be16 orig_eth_type; |
4246 | struct ethhdr *eth; | |
4247 | bool orig_bcast; | |
d4455169 JF |
4248 | int hlen, off; |
4249 | u32 mac_len; | |
4250 | ||
4251 | /* Reinjected packets coming from act_mirred or similar should | |
4252 | * not get XDP generic processing. | |
4253 | */ | |
adca4bff | 4254 | if (skb_is_redirected(skb)) |
d4455169 JF |
4255 | return XDP_PASS; |
4256 | ||
de8f3a83 DB |
4257 | /* XDP packets must be linear and must have sufficient headroom |
4258 | * of XDP_PACKET_HEADROOM bytes. This is the guarantee that also | |
4259 | * native XDP provides, thus we need to do it here as well. | |
4260 | */ | |
a6ff027a | 4261 | if (skb_cloned(skb) || skb_is_nonlinear(skb) || |
de8f3a83 DB |
4262 | skb_headroom(skb) < XDP_PACKET_HEADROOM) { |
4263 | int hroom = XDP_PACKET_HEADROOM - skb_headroom(skb); | |
4264 | int troom = skb->tail + skb->data_len - skb->end; | |
4265 | ||
4266 | /* In case we have to go down the path and also linearize, | |
4267 | * then lets do the pskb_expand_head() work just once here. | |
4268 | */ | |
4269 | if (pskb_expand_head(skb, | |
4270 | hroom > 0 ? ALIGN(hroom, NET_SKB_PAD) : 0, | |
4271 | troom > 0 ? troom + 128 : 0, GFP_ATOMIC)) | |
4272 | goto do_drop; | |
2d17d8d7 | 4273 | if (skb_linearize(skb)) |
de8f3a83 DB |
4274 | goto do_drop; |
4275 | } | |
d4455169 JF |
4276 | |
4277 | /* The XDP program wants to see the packet starting at the MAC | |
4278 | * header. | |
4279 | */ | |
4280 | mac_len = skb->data - skb_mac_header(skb); | |
4281 | hlen = skb_headlen(skb) + mac_len; | |
02671e23 BT |
4282 | xdp->data = skb->data - mac_len; |
4283 | xdp->data_meta = xdp->data; | |
4284 | xdp->data_end = xdp->data + hlen; | |
4285 | xdp->data_hard_start = skb->data - skb_headroom(skb); | |
4286 | orig_data_end = xdp->data_end; | |
4287 | orig_data = xdp->data; | |
29724956 JDB |
4288 | eth = (struct ethhdr *)xdp->data; |
4289 | orig_bcast = is_multicast_ether_addr_64bits(eth->h_dest); | |
4290 | orig_eth_type = eth->h_proto; | |
d4455169 | 4291 | |
e817f856 | 4292 | rxqueue = netif_get_rxqueue(skb); |
02671e23 | 4293 | xdp->rxq = &rxqueue->xdp_rxq; |
e817f856 | 4294 | |
02671e23 | 4295 | act = bpf_prog_run_xdp(xdp_prog, xdp); |
d4455169 | 4296 | |
065af355 | 4297 | /* check if bpf_xdp_adjust_head was used */ |
02671e23 | 4298 | off = xdp->data - orig_data; |
065af355 JDB |
4299 | if (off) { |
4300 | if (off > 0) | |
4301 | __skb_pull(skb, off); | |
4302 | else if (off < 0) | |
4303 | __skb_push(skb, -off); | |
4304 | ||
4305 | skb->mac_header += off; | |
4306 | skb_reset_network_header(skb); | |
4307 | } | |
d4455169 | 4308 | |
198d83bb NS |
4309 | /* check if bpf_xdp_adjust_tail was used. it can only "shrink" |
4310 | * pckt. | |
4311 | */ | |
02671e23 | 4312 | off = orig_data_end - xdp->data_end; |
f7613120 | 4313 | if (off != 0) { |
02671e23 | 4314 | skb_set_tail_pointer(skb, xdp->data_end - xdp->data); |
f7613120 | 4315 | skb->len -= off; |
02671e23 | 4316 | |
f7613120 | 4317 | } |
198d83bb | 4318 | |
29724956 JDB |
4319 | /* check if XDP changed eth hdr such SKB needs update */ |
4320 | eth = (struct ethhdr *)xdp->data; | |
4321 | if ((orig_eth_type != eth->h_proto) || | |
4322 | (orig_bcast != is_multicast_ether_addr_64bits(eth->h_dest))) { | |
4323 | __skb_push(skb, ETH_HLEN); | |
4324 | skb->protocol = eth_type_trans(skb, skb->dev); | |
4325 | } | |
4326 | ||
d4455169 | 4327 | switch (act) { |
6103aa96 | 4328 | case XDP_REDIRECT: |
d4455169 JF |
4329 | case XDP_TX: |
4330 | __skb_push(skb, mac_len); | |
de8f3a83 | 4331 | break; |
d4455169 | 4332 | case XDP_PASS: |
02671e23 | 4333 | metalen = xdp->data - xdp->data_meta; |
de8f3a83 DB |
4334 | if (metalen) |
4335 | skb_metadata_set(skb, metalen); | |
d4455169 | 4336 | break; |
d4455169 JF |
4337 | default: |
4338 | bpf_warn_invalid_xdp_action(act); | |
4339 | /* fall through */ | |
4340 | case XDP_ABORTED: | |
4341 | trace_xdp_exception(skb->dev, xdp_prog, act); | |
4342 | /* fall through */ | |
4343 | case XDP_DROP: | |
4344 | do_drop: | |
4345 | kfree_skb(skb); | |
4346 | break; | |
4347 | } | |
4348 | ||
4349 | return act; | |
4350 | } | |
4351 | ||
4352 | /* When doing generic XDP we have to bypass the qdisc layer and the | |
4353 | * network taps in order to match in-driver-XDP behavior. | |
4354 | */ | |
7c497478 | 4355 | void generic_xdp_tx(struct sk_buff *skb, struct bpf_prog *xdp_prog) |
d4455169 JF |
4356 | { |
4357 | struct net_device *dev = skb->dev; | |
4358 | struct netdev_queue *txq; | |
4359 | bool free_skb = true; | |
4360 | int cpu, rc; | |
4361 | ||
4bd97d51 | 4362 | txq = netdev_core_pick_tx(dev, skb, NULL); |
d4455169 JF |
4363 | cpu = smp_processor_id(); |
4364 | HARD_TX_LOCK(dev, txq, cpu); | |
4365 | if (!netif_xmit_stopped(txq)) { | |
4366 | rc = netdev_start_xmit(skb, dev, txq, 0); | |
4367 | if (dev_xmit_complete(rc)) | |
4368 | free_skb = false; | |
4369 | } | |
4370 | HARD_TX_UNLOCK(dev, txq); | |
4371 | if (free_skb) { | |
4372 | trace_xdp_exception(dev, xdp_prog, XDP_TX); | |
4373 | kfree_skb(skb); | |
4374 | } | |
4375 | } | |
7c497478 | 4376 | EXPORT_SYMBOL_GPL(generic_xdp_tx); |
d4455169 | 4377 | |
02786475 | 4378 | static DEFINE_STATIC_KEY_FALSE(generic_xdp_needed_key); |
d4455169 | 4379 | |
7c497478 | 4380 | int do_xdp_generic(struct bpf_prog *xdp_prog, struct sk_buff *skb) |
d4455169 | 4381 | { |
d4455169 | 4382 | if (xdp_prog) { |
02671e23 BT |
4383 | struct xdp_buff xdp; |
4384 | u32 act; | |
6103aa96 | 4385 | int err; |
d4455169 | 4386 | |
02671e23 | 4387 | act = netif_receive_generic_xdp(skb, &xdp, xdp_prog); |
d4455169 | 4388 | if (act != XDP_PASS) { |
6103aa96 JF |
4389 | switch (act) { |
4390 | case XDP_REDIRECT: | |
2facaad6 | 4391 | err = xdp_do_generic_redirect(skb->dev, skb, |
02671e23 | 4392 | &xdp, xdp_prog); |
6103aa96 JF |
4393 | if (err) |
4394 | goto out_redir; | |
02671e23 | 4395 | break; |
6103aa96 | 4396 | case XDP_TX: |
d4455169 | 4397 | generic_xdp_tx(skb, xdp_prog); |
6103aa96 JF |
4398 | break; |
4399 | } | |
d4455169 JF |
4400 | return XDP_DROP; |
4401 | } | |
4402 | } | |
4403 | return XDP_PASS; | |
6103aa96 | 4404 | out_redir: |
6103aa96 JF |
4405 | kfree_skb(skb); |
4406 | return XDP_DROP; | |
d4455169 | 4407 | } |
7c497478 | 4408 | EXPORT_SYMBOL_GPL(do_xdp_generic); |
d4455169 | 4409 | |
ae78dbfa | 4410 | static int netif_rx_internal(struct sk_buff *skb) |
1da177e4 | 4411 | { |
b0e28f1e | 4412 | int ret; |
1da177e4 | 4413 | |
588f0330 | 4414 | net_timestamp_check(netdev_tstamp_prequeue, skb); |
1da177e4 | 4415 | |
cf66ba58 | 4416 | trace_netif_rx(skb); |
d4455169 | 4417 | |
df334545 | 4418 | #ifdef CONFIG_RPS |
dc05360f | 4419 | if (static_branch_unlikely(&rps_needed)) { |
fec5e652 | 4420 | struct rps_dev_flow voidflow, *rflow = &voidflow; |
b0e28f1e ED |
4421 | int cpu; |
4422 | ||
cece1945 | 4423 | preempt_disable(); |
b0e28f1e | 4424 | rcu_read_lock(); |
fec5e652 TH |
4425 | |
4426 | cpu = get_rps_cpu(skb->dev, skb, &rflow); | |
b0e28f1e ED |
4427 | if (cpu < 0) |
4428 | cpu = smp_processor_id(); | |
fec5e652 TH |
4429 | |
4430 | ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail); | |
4431 | ||
b0e28f1e | 4432 | rcu_read_unlock(); |
cece1945 | 4433 | preempt_enable(); |
adc9300e ED |
4434 | } else |
4435 | #endif | |
fec5e652 TH |
4436 | { |
4437 | unsigned int qtail; | |
f4563a75 | 4438 | |
fec5e652 TH |
4439 | ret = enqueue_to_backlog(skb, get_cpu(), &qtail); |
4440 | put_cpu(); | |
4441 | } | |
b0e28f1e | 4442 | return ret; |
1da177e4 | 4443 | } |
ae78dbfa BH |
4444 | |
4445 | /** | |
4446 | * netif_rx - post buffer to the network code | |
4447 | * @skb: buffer to post | |
4448 | * | |
4449 | * This function receives a packet from a device driver and queues it for | |
4450 | * the upper (protocol) levels to process. It always succeeds. The buffer | |
4451 | * may be dropped during processing for congestion control or by the | |
4452 | * protocol layers. | |
4453 | * | |
4454 | * return values: | |
4455 | * NET_RX_SUCCESS (no congestion) | |
4456 | * NET_RX_DROP (packet was dropped) | |
4457 | * | |
4458 | */ | |
4459 | ||
4460 | int netif_rx(struct sk_buff *skb) | |
4461 | { | |
b0e3f1bd GB |
4462 | int ret; |
4463 | ||
ae78dbfa BH |
4464 | trace_netif_rx_entry(skb); |
4465 | ||
b0e3f1bd GB |
4466 | ret = netif_rx_internal(skb); |
4467 | trace_netif_rx_exit(ret); | |
4468 | ||
4469 | return ret; | |
ae78dbfa | 4470 | } |
d1b19dff | 4471 | EXPORT_SYMBOL(netif_rx); |
1da177e4 LT |
4472 | |
4473 | int netif_rx_ni(struct sk_buff *skb) | |
4474 | { | |
4475 | int err; | |
4476 | ||
ae78dbfa BH |
4477 | trace_netif_rx_ni_entry(skb); |
4478 | ||
1da177e4 | 4479 | preempt_disable(); |
ae78dbfa | 4480 | err = netif_rx_internal(skb); |
1da177e4 LT |
4481 | if (local_softirq_pending()) |
4482 | do_softirq(); | |
4483 | preempt_enable(); | |
b0e3f1bd | 4484 | trace_netif_rx_ni_exit(err); |
1da177e4 LT |
4485 | |
4486 | return err; | |
4487 | } | |
1da177e4 LT |
4488 | EXPORT_SYMBOL(netif_rx_ni); |
4489 | ||
0766f788 | 4490 | static __latent_entropy void net_tx_action(struct softirq_action *h) |
1da177e4 | 4491 | { |
903ceff7 | 4492 | struct softnet_data *sd = this_cpu_ptr(&softnet_data); |
1da177e4 LT |
4493 | |
4494 | if (sd->completion_queue) { | |
4495 | struct sk_buff *clist; | |
4496 | ||
4497 | local_irq_disable(); | |
4498 | clist = sd->completion_queue; | |
4499 | sd->completion_queue = NULL; | |
4500 | local_irq_enable(); | |
4501 | ||
4502 | while (clist) { | |
4503 | struct sk_buff *skb = clist; | |
f4563a75 | 4504 | |
1da177e4 LT |
4505 | clist = clist->next; |
4506 | ||
63354797 | 4507 | WARN_ON(refcount_read(&skb->users)); |
e6247027 ED |
4508 | if (likely(get_kfree_skb_cb(skb)->reason == SKB_REASON_CONSUMED)) |
4509 | trace_consume_skb(skb); | |
4510 | else | |
4511 | trace_kfree_skb(skb, net_tx_action); | |
15fad714 JDB |
4512 | |
4513 | if (skb->fclone != SKB_FCLONE_UNAVAILABLE) | |
4514 | __kfree_skb(skb); | |
4515 | else | |
4516 | __kfree_skb_defer(skb); | |
1da177e4 | 4517 | } |
15fad714 JDB |
4518 | |
4519 | __kfree_skb_flush(); | |
1da177e4 LT |
4520 | } |
4521 | ||
4522 | if (sd->output_queue) { | |
37437bb2 | 4523 | struct Qdisc *head; |
1da177e4 LT |
4524 | |
4525 | local_irq_disable(); | |
4526 | head = sd->output_queue; | |
4527 | sd->output_queue = NULL; | |
a9cbd588 | 4528 | sd->output_queue_tailp = &sd->output_queue; |
1da177e4 LT |
4529 | local_irq_enable(); |
4530 | ||
2335948f YL |
4531 | rcu_read_lock(); |
4532 | ||
1da177e4 | 4533 | while (head) { |
37437bb2 | 4534 | struct Qdisc *q = head; |
6b3ba914 | 4535 | spinlock_t *root_lock = NULL; |
37437bb2 | 4536 | |
1da177e4 LT |
4537 | head = head->next_sched; |
4538 | ||
3bcb846c ED |
4539 | /* We need to make sure head->next_sched is read |
4540 | * before clearing __QDISC_STATE_SCHED | |
4541 | */ | |
4542 | smp_mb__before_atomic(); | |
2335948f YL |
4543 | |
4544 | if (!(q->flags & TCQ_F_NOLOCK)) { | |
4545 | root_lock = qdisc_lock(q); | |
4546 | spin_lock(root_lock); | |
4547 | } else if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, | |
4548 | &q->state))) { | |
4549 | /* There is a synchronize_net() between | |
4550 | * STATE_DEACTIVATED flag being set and | |
4551 | * qdisc_reset()/some_qdisc_is_busy() in | |
4552 | * dev_deactivate(), so we can safely bail out | |
4553 | * early here to avoid data race between | |
4554 | * qdisc_deactivate() and some_qdisc_is_busy() | |
4555 | * for lockless qdisc. | |
4556 | */ | |
4557 | clear_bit(__QDISC_STATE_SCHED, &q->state); | |
4558 | continue; | |
4559 | } | |
4560 | ||
3bcb846c ED |
4561 | clear_bit(__QDISC_STATE_SCHED, &q->state); |
4562 | qdisc_run(q); | |
6b3ba914 JF |
4563 | if (root_lock) |
4564 | spin_unlock(root_lock); | |
1da177e4 | 4565 | } |
2335948f YL |
4566 | |
4567 | rcu_read_unlock(); | |
1da177e4 | 4568 | } |
f53c7239 SK |
4569 | |
4570 | xfrm_dev_backlog(sd); | |
1da177e4 LT |
4571 | } |
4572 | ||
181402a5 | 4573 | #if IS_ENABLED(CONFIG_BRIDGE) && IS_ENABLED(CONFIG_ATM_LANE) |
da678292 MM |
4574 | /* This hook is defined here for ATM LANE */ |
4575 | int (*br_fdb_test_addr_hook)(struct net_device *dev, | |
4576 | unsigned char *addr) __read_mostly; | |
4fb019a0 | 4577 | EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook); |
da678292 | 4578 | #endif |
1da177e4 | 4579 | |
1f211a1b DB |
4580 | static inline struct sk_buff * |
4581 | sch_handle_ingress(struct sk_buff *skb, struct packet_type **pt_prev, int *ret, | |
4582 | struct net_device *orig_dev) | |
f697c3e8 | 4583 | { |
e7582bab | 4584 | #ifdef CONFIG_NET_CLS_ACT |
46209401 | 4585 | struct mini_Qdisc *miniq = rcu_dereference_bh(skb->dev->miniq_ingress); |
d2788d34 | 4586 | struct tcf_result cl_res; |
24824a09 | 4587 | |
c9e99fd0 DB |
4588 | /* If there's at least one ingress present somewhere (so |
4589 | * we get here via enabled static key), remaining devices | |
4590 | * that are not configured with an ingress qdisc will bail | |
d2788d34 | 4591 | * out here. |
c9e99fd0 | 4592 | */ |
46209401 | 4593 | if (!miniq) |
4577139b | 4594 | return skb; |
46209401 | 4595 | |
f697c3e8 HX |
4596 | if (*pt_prev) { |
4597 | *ret = deliver_skb(skb, *pt_prev, orig_dev); | |
4598 | *pt_prev = NULL; | |
1da177e4 LT |
4599 | } |
4600 | ||
3365495c | 4601 | qdisc_skb_cb(skb)->pkt_len = skb->len; |
8dc07fdb | 4602 | skb->tc_at_ingress = 1; |
46209401 | 4603 | mini_qdisc_bstats_cpu_update(miniq, skb); |
c9e99fd0 | 4604 | |
46209401 | 4605 | switch (tcf_classify(skb, miniq->filter_list, &cl_res, false)) { |
d2788d34 DB |
4606 | case TC_ACT_OK: |
4607 | case TC_ACT_RECLASSIFY: | |
4608 | skb->tc_index = TC_H_MIN(cl_res.classid); | |
4609 | break; | |
4610 | case TC_ACT_SHOT: | |
46209401 | 4611 | mini_qdisc_qstats_cpu_drop(miniq); |
8a3a4c6e ED |
4612 | kfree_skb(skb); |
4613 | return NULL; | |
d2788d34 DB |
4614 | case TC_ACT_STOLEN: |
4615 | case TC_ACT_QUEUED: | |
e25ea21f | 4616 | case TC_ACT_TRAP: |
8a3a4c6e | 4617 | consume_skb(skb); |
d2788d34 | 4618 | return NULL; |
27b29f63 AS |
4619 | case TC_ACT_REDIRECT: |
4620 | /* skb_mac_header check was done by cls/act_bpf, so | |
4621 | * we can safely push the L2 header back before | |
4622 | * redirecting to another netdev | |
4623 | */ | |
4624 | __skb_push(skb, skb->mac_len); | |
4625 | skb_do_redirect(skb); | |
4626 | return NULL; | |
720f22fe | 4627 | case TC_ACT_CONSUMED: |
cd11b164 | 4628 | return NULL; |
d2788d34 DB |
4629 | default: |
4630 | break; | |
f697c3e8 | 4631 | } |
e7582bab | 4632 | #endif /* CONFIG_NET_CLS_ACT */ |
e687ad60 PN |
4633 | return skb; |
4634 | } | |
1da177e4 | 4635 | |
24b27fc4 MB |
4636 | /** |
4637 | * netdev_is_rx_handler_busy - check if receive handler is registered | |
4638 | * @dev: device to check | |
4639 | * | |
4640 | * Check if a receive handler is already registered for a given device. | |
4641 | * Return true if there one. | |
4642 | * | |
4643 | * The caller must hold the rtnl_mutex. | |
4644 | */ | |
4645 | bool netdev_is_rx_handler_busy(struct net_device *dev) | |
4646 | { | |
4647 | ASSERT_RTNL(); | |
4648 | return dev && rtnl_dereference(dev->rx_handler); | |
4649 | } | |
4650 | EXPORT_SYMBOL_GPL(netdev_is_rx_handler_busy); | |
4651 | ||
ab95bfe0 JP |
4652 | /** |
4653 | * netdev_rx_handler_register - register receive handler | |
4654 | * @dev: device to register a handler for | |
4655 | * @rx_handler: receive handler to register | |
93e2c32b | 4656 | * @rx_handler_data: data pointer that is used by rx handler |
ab95bfe0 | 4657 | * |
e227867f | 4658 | * Register a receive handler for a device. This handler will then be |
ab95bfe0 JP |
4659 | * called from __netif_receive_skb. A negative errno code is returned |
4660 | * on a failure. | |
4661 | * | |
4662 | * The caller must hold the rtnl_mutex. | |
8a4eb573 JP |
4663 | * |
4664 | * For a general description of rx_handler, see enum rx_handler_result. | |
ab95bfe0 JP |
4665 | */ |
4666 | int netdev_rx_handler_register(struct net_device *dev, | |
93e2c32b JP |
4667 | rx_handler_func_t *rx_handler, |
4668 | void *rx_handler_data) | |
ab95bfe0 | 4669 | { |
1b7cd004 | 4670 | if (netdev_is_rx_handler_busy(dev)) |
ab95bfe0 JP |
4671 | return -EBUSY; |
4672 | ||
f5426250 PA |
4673 | if (dev->priv_flags & IFF_NO_RX_HANDLER) |
4674 | return -EINVAL; | |
4675 | ||
00cfec37 | 4676 | /* Note: rx_handler_data must be set before rx_handler */ |
93e2c32b | 4677 | rcu_assign_pointer(dev->rx_handler_data, rx_handler_data); |
ab95bfe0 JP |
4678 | rcu_assign_pointer(dev->rx_handler, rx_handler); |
4679 | ||
4680 | return 0; | |
4681 | } | |
4682 | EXPORT_SYMBOL_GPL(netdev_rx_handler_register); | |
4683 | ||
4684 | /** | |
4685 | * netdev_rx_handler_unregister - unregister receive handler | |
4686 | * @dev: device to unregister a handler from | |
4687 | * | |
166ec369 | 4688 | * Unregister a receive handler from a device. |
ab95bfe0 JP |
4689 | * |
4690 | * The caller must hold the rtnl_mutex. | |
4691 | */ | |
4692 | void netdev_rx_handler_unregister(struct net_device *dev) | |
4693 | { | |
4694 | ||
4695 | ASSERT_RTNL(); | |
a9b3cd7f | 4696 | RCU_INIT_POINTER(dev->rx_handler, NULL); |
00cfec37 ED |
4697 | /* a reader seeing a non NULL rx_handler in a rcu_read_lock() |
4698 | * section has a guarantee to see a non NULL rx_handler_data | |
4699 | * as well. | |
4700 | */ | |
4701 | synchronize_net(); | |
a9b3cd7f | 4702 | RCU_INIT_POINTER(dev->rx_handler_data, NULL); |
ab95bfe0 JP |
4703 | } |
4704 | EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister); | |
4705 | ||
b4b9e355 MG |
4706 | /* |
4707 | * Limit the use of PFMEMALLOC reserves to those protocols that implement | |
4708 | * the special handling of PFMEMALLOC skbs. | |
4709 | */ | |
4710 | static bool skb_pfmemalloc_protocol(struct sk_buff *skb) | |
4711 | { | |
4712 | switch (skb->protocol) { | |
2b8837ae JP |
4713 | case htons(ETH_P_ARP): |
4714 | case htons(ETH_P_IP): | |
4715 | case htons(ETH_P_IPV6): | |
4716 | case htons(ETH_P_8021Q): | |
4717 | case htons(ETH_P_8021AD): | |
b4b9e355 MG |
4718 | return true; |
4719 | default: | |
4720 | return false; | |
4721 | } | |
4722 | } | |
4723 | ||
e687ad60 PN |
4724 | static inline int nf_ingress(struct sk_buff *skb, struct packet_type **pt_prev, |
4725 | int *ret, struct net_device *orig_dev) | |
4726 | { | |
e7582bab | 4727 | #ifdef CONFIG_NETFILTER_INGRESS |
e687ad60 | 4728 | if (nf_hook_ingress_active(skb)) { |
2c1e2703 AC |
4729 | int ingress_retval; |
4730 | ||
e687ad60 PN |
4731 | if (*pt_prev) { |
4732 | *ret = deliver_skb(skb, *pt_prev, orig_dev); | |
4733 | *pt_prev = NULL; | |
4734 | } | |
4735 | ||
2c1e2703 AC |
4736 | rcu_read_lock(); |
4737 | ingress_retval = nf_hook_ingress(skb); | |
4738 | rcu_read_unlock(); | |
4739 | return ingress_retval; | |
e687ad60 | 4740 | } |
e7582bab | 4741 | #endif /* CONFIG_NETFILTER_INGRESS */ |
e687ad60 PN |
4742 | return 0; |
4743 | } | |
e687ad60 | 4744 | |
335b7c12 | 4745 | static int __netif_receive_skb_core(struct sk_buff **pskb, bool pfmemalloc, |
88eb1944 | 4746 | struct packet_type **ppt_prev) |
1da177e4 LT |
4747 | { |
4748 | struct packet_type *ptype, *pt_prev; | |
ab95bfe0 | 4749 | rx_handler_func_t *rx_handler; |
335b7c12 | 4750 | struct sk_buff *skb = *pskb; |
f2ccd8fa | 4751 | struct net_device *orig_dev; |
8a4eb573 | 4752 | bool deliver_exact = false; |
1da177e4 | 4753 | int ret = NET_RX_DROP; |
252e3346 | 4754 | __be16 type; |
1da177e4 | 4755 | |
588f0330 | 4756 | net_timestamp_check(!netdev_tstamp_prequeue, skb); |
81bbb3d4 | 4757 | |
cf66ba58 | 4758 | trace_netif_receive_skb(skb); |
9b22ea56 | 4759 | |
cc9bd5ce | 4760 | orig_dev = skb->dev; |
8f903c70 | 4761 | |
c1d2bbe1 | 4762 | skb_reset_network_header(skb); |
fda55eca ED |
4763 | if (!skb_transport_header_was_set(skb)) |
4764 | skb_reset_transport_header(skb); | |
0b5c9db1 | 4765 | skb_reset_mac_len(skb); |
1da177e4 LT |
4766 | |
4767 | pt_prev = NULL; | |
4768 | ||
63d8ea7f | 4769 | another_round: |
b6858177 | 4770 | skb->skb_iif = skb->dev->ifindex; |
63d8ea7f DM |
4771 | |
4772 | __this_cpu_inc(softnet_data.processed); | |
4773 | ||
458bf2f2 SH |
4774 | if (static_branch_unlikely(&generic_xdp_needed_key)) { |
4775 | int ret2; | |
4776 | ||
4777 | preempt_disable(); | |
4778 | ret2 = do_xdp_generic(rcu_dereference(skb->dev->xdp_prog), skb); | |
4779 | preempt_enable(); | |
4780 | ||
335b7c12 BS |
4781 | if (ret2 != XDP_PASS) { |
4782 | ret = NET_RX_DROP; | |
4783 | goto out; | |
4784 | } | |
458bf2f2 SH |
4785 | skb_reset_mac_len(skb); |
4786 | } | |
4787 | ||
8ad227ff PM |
4788 | if (skb->protocol == cpu_to_be16(ETH_P_8021Q) || |
4789 | skb->protocol == cpu_to_be16(ETH_P_8021AD)) { | |
0d5501c1 | 4790 | skb = skb_vlan_untag(skb); |
bcc6d479 | 4791 | if (unlikely(!skb)) |
2c17d27c | 4792 | goto out; |
bcc6d479 JP |
4793 | } |
4794 | ||
e7246e12 WB |
4795 | if (skb_skip_tc_classify(skb)) |
4796 | goto skip_classify; | |
1da177e4 | 4797 | |
9754e293 | 4798 | if (pfmemalloc) |
b4b9e355 MG |
4799 | goto skip_taps; |
4800 | ||
1da177e4 | 4801 | list_for_each_entry_rcu(ptype, &ptype_all, list) { |
7866a621 SN |
4802 | if (pt_prev) |
4803 | ret = deliver_skb(skb, pt_prev, orig_dev); | |
4804 | pt_prev = ptype; | |
4805 | } | |
4806 | ||
4807 | list_for_each_entry_rcu(ptype, &skb->dev->ptype_all, list) { | |
4808 | if (pt_prev) | |
4809 | ret = deliver_skb(skb, pt_prev, orig_dev); | |
4810 | pt_prev = ptype; | |
1da177e4 LT |
4811 | } |
4812 | ||
b4b9e355 | 4813 | skip_taps: |
1cf51900 | 4814 | #ifdef CONFIG_NET_INGRESS |
aabf6772 | 4815 | if (static_branch_unlikely(&ingress_needed_key)) { |
1f211a1b | 4816 | skb = sch_handle_ingress(skb, &pt_prev, &ret, orig_dev); |
4577139b | 4817 | if (!skb) |
2c17d27c | 4818 | goto out; |
e687ad60 PN |
4819 | |
4820 | if (nf_ingress(skb, &pt_prev, &ret, orig_dev) < 0) | |
2c17d27c | 4821 | goto out; |
4577139b | 4822 | } |
1cf51900 | 4823 | #endif |
adca4bff | 4824 | skb_reset_redirect(skb); |
e7246e12 | 4825 | skip_classify: |
9754e293 | 4826 | if (pfmemalloc && !skb_pfmemalloc_protocol(skb)) |
b4b9e355 MG |
4827 | goto drop; |
4828 | ||
df8a39de | 4829 | if (skb_vlan_tag_present(skb)) { |
2425717b JF |
4830 | if (pt_prev) { |
4831 | ret = deliver_skb(skb, pt_prev, orig_dev); | |
4832 | pt_prev = NULL; | |
4833 | } | |
48cc32d3 | 4834 | if (vlan_do_receive(&skb)) |
2425717b JF |
4835 | goto another_round; |
4836 | else if (unlikely(!skb)) | |
2c17d27c | 4837 | goto out; |
2425717b JF |
4838 | } |
4839 | ||
48cc32d3 | 4840 | rx_handler = rcu_dereference(skb->dev->rx_handler); |
ab95bfe0 JP |
4841 | if (rx_handler) { |
4842 | if (pt_prev) { | |
4843 | ret = deliver_skb(skb, pt_prev, orig_dev); | |
4844 | pt_prev = NULL; | |
4845 | } | |
8a4eb573 JP |
4846 | switch (rx_handler(&skb)) { |
4847 | case RX_HANDLER_CONSUMED: | |
3bc1b1ad | 4848 | ret = NET_RX_SUCCESS; |
2c17d27c | 4849 | goto out; |
8a4eb573 | 4850 | case RX_HANDLER_ANOTHER: |
63d8ea7f | 4851 | goto another_round; |
8a4eb573 JP |
4852 | case RX_HANDLER_EXACT: |
4853 | deliver_exact = true; | |
4854 | case RX_HANDLER_PASS: | |
4855 | break; | |
4856 | default: | |
4857 | BUG(); | |
4858 | } | |
ab95bfe0 | 4859 | } |
1da177e4 | 4860 | |
df8a39de | 4861 | if (unlikely(skb_vlan_tag_present(skb))) { |
36b2f61a GV |
4862 | check_vlan_id: |
4863 | if (skb_vlan_tag_get_id(skb)) { | |
4864 | /* Vlan id is non 0 and vlan_do_receive() above couldn't | |
4865 | * find vlan device. | |
4866 | */ | |
d4b812de | 4867 | skb->pkt_type = PACKET_OTHERHOST; |
36b2f61a GV |
4868 | } else if (skb->protocol == cpu_to_be16(ETH_P_8021Q) || |
4869 | skb->protocol == cpu_to_be16(ETH_P_8021AD)) { | |
4870 | /* Outer header is 802.1P with vlan 0, inner header is | |
4871 | * 802.1Q or 802.1AD and vlan_do_receive() above could | |
4872 | * not find vlan dev for vlan id 0. | |
4873 | */ | |
4874 | __vlan_hwaccel_clear_tag(skb); | |
4875 | skb = skb_vlan_untag(skb); | |
4876 | if (unlikely(!skb)) | |
4877 | goto out; | |
4878 | if (vlan_do_receive(&skb)) | |
4879 | /* After stripping off 802.1P header with vlan 0 | |
4880 | * vlan dev is found for inner header. | |
4881 | */ | |
4882 | goto another_round; | |
4883 | else if (unlikely(!skb)) | |
4884 | goto out; | |
4885 | else | |
4886 | /* We have stripped outer 802.1P vlan 0 header. | |
4887 | * But could not find vlan dev. | |
4888 | * check again for vlan id to set OTHERHOST. | |
4889 | */ | |
4890 | goto check_vlan_id; | |
4891 | } | |
d4b812de ED |
4892 | /* Note: we might in the future use prio bits |
4893 | * and set skb->priority like in vlan_do_receive() | |
4894 | * For the time being, just ignore Priority Code Point | |
4895 | */ | |
b1817524 | 4896 | __vlan_hwaccel_clear_tag(skb); |
d4b812de | 4897 | } |
48cc32d3 | 4898 | |
7866a621 SN |
4899 | type = skb->protocol; |
4900 | ||
63d8ea7f | 4901 | /* deliver only exact match when indicated */ |
7866a621 SN |
4902 | if (likely(!deliver_exact)) { |
4903 | deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type, | |
4904 | &ptype_base[ntohs(type) & | |
4905 | PTYPE_HASH_MASK]); | |
4906 | } | |
1f3c8804 | 4907 | |
7866a621 SN |
4908 | deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type, |
4909 | &orig_dev->ptype_specific); | |
4910 | ||
4911 | if (unlikely(skb->dev != orig_dev)) { | |
4912 | deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type, | |
4913 | &skb->dev->ptype_specific); | |
1da177e4 LT |
4914 | } |
4915 | ||
4916 | if (pt_prev) { | |
1f8b977a | 4917 | if (unlikely(skb_orphan_frags_rx(skb, GFP_ATOMIC))) |
0e698bf6 | 4918 | goto drop; |
88eb1944 | 4919 | *ppt_prev = pt_prev; |
1da177e4 | 4920 | } else { |
b4b9e355 | 4921 | drop: |
6e7333d3 JW |
4922 | if (!deliver_exact) |
4923 | atomic_long_inc(&skb->dev->rx_dropped); | |
4924 | else | |
4925 | atomic_long_inc(&skb->dev->rx_nohandler); | |
1da177e4 LT |
4926 | kfree_skb(skb); |
4927 | /* Jamal, now you will not able to escape explaining | |
4928 | * me how you were going to use this. :-) | |
4929 | */ | |
4930 | ret = NET_RX_DROP; | |
4931 | } | |
4932 | ||
2c17d27c | 4933 | out: |
335b7c12 BS |
4934 | /* The invariant here is that if *ppt_prev is not NULL |
4935 | * then skb should also be non-NULL. | |
4936 | * | |
4937 | * Apparently *ppt_prev assignment above holds this invariant due to | |
4938 | * skb dereferencing near it. | |
4939 | */ | |
4940 | *pskb = skb; | |
9754e293 DM |
4941 | return ret; |
4942 | } | |
4943 | ||
88eb1944 EC |
4944 | static int __netif_receive_skb_one_core(struct sk_buff *skb, bool pfmemalloc) |
4945 | { | |
4946 | struct net_device *orig_dev = skb->dev; | |
4947 | struct packet_type *pt_prev = NULL; | |
4948 | int ret; | |
4949 | ||
335b7c12 | 4950 | ret = __netif_receive_skb_core(&skb, pfmemalloc, &pt_prev); |
88eb1944 | 4951 | if (pt_prev) |
f5737cba PA |
4952 | ret = INDIRECT_CALL_INET(pt_prev->func, ipv6_rcv, ip_rcv, skb, |
4953 | skb->dev, pt_prev, orig_dev); | |
88eb1944 EC |
4954 | return ret; |
4955 | } | |
4956 | ||
1c601d82 JDB |
4957 | /** |
4958 | * netif_receive_skb_core - special purpose version of netif_receive_skb | |
4959 | * @skb: buffer to process | |
4960 | * | |
4961 | * More direct receive version of netif_receive_skb(). It should | |
4962 | * only be used by callers that have a need to skip RPS and Generic XDP. | |
4963 | * Caller must also take care of handling if (page_is_)pfmemalloc. | |
4964 | * | |
4965 | * This function may only be called from softirq context and interrupts | |
4966 | * should be enabled. | |
4967 | * | |
4968 | * Return values (usually ignored): | |
4969 | * NET_RX_SUCCESS: no congestion | |
4970 | * NET_RX_DROP: packet was dropped | |
4971 | */ | |
4972 | int netif_receive_skb_core(struct sk_buff *skb) | |
4973 | { | |
4974 | int ret; | |
4975 | ||
4976 | rcu_read_lock(); | |
88eb1944 | 4977 | ret = __netif_receive_skb_one_core(skb, false); |
1c601d82 JDB |
4978 | rcu_read_unlock(); |
4979 | ||
4980 | return ret; | |
4981 | } | |
4982 | EXPORT_SYMBOL(netif_receive_skb_core); | |
4983 | ||
88eb1944 EC |
4984 | static inline void __netif_receive_skb_list_ptype(struct list_head *head, |
4985 | struct packet_type *pt_prev, | |
4986 | struct net_device *orig_dev) | |
4ce0017a EC |
4987 | { |
4988 | struct sk_buff *skb, *next; | |
4989 | ||
88eb1944 EC |
4990 | if (!pt_prev) |
4991 | return; | |
4992 | if (list_empty(head)) | |
4993 | return; | |
17266ee9 | 4994 | if (pt_prev->list_func != NULL) |
fdf71426 PA |
4995 | INDIRECT_CALL_INET(pt_prev->list_func, ipv6_list_rcv, |
4996 | ip_list_rcv, head, pt_prev, orig_dev); | |
17266ee9 | 4997 | else |
9a5a90d1 AL |
4998 | list_for_each_entry_safe(skb, next, head, list) { |
4999 | skb_list_del_init(skb); | |
fdf71426 | 5000 | pt_prev->func(skb, skb->dev, pt_prev, orig_dev); |
9a5a90d1 | 5001 | } |
88eb1944 EC |
5002 | } |
5003 | ||
5004 | static void __netif_receive_skb_list_core(struct list_head *head, bool pfmemalloc) | |
5005 | { | |
5006 | /* Fast-path assumptions: | |
5007 | * - There is no RX handler. | |
5008 | * - Only one packet_type matches. | |
5009 | * If either of these fails, we will end up doing some per-packet | |
5010 | * processing in-line, then handling the 'last ptype' for the whole | |
5011 | * sublist. This can't cause out-of-order delivery to any single ptype, | |
5012 | * because the 'last ptype' must be constant across the sublist, and all | |
5013 | * other ptypes are handled per-packet. | |
5014 | */ | |
5015 | /* Current (common) ptype of sublist */ | |
5016 | struct packet_type *pt_curr = NULL; | |
5017 | /* Current (common) orig_dev of sublist */ | |
5018 | struct net_device *od_curr = NULL; | |
5019 | struct list_head sublist; | |
5020 | struct sk_buff *skb, *next; | |
5021 | ||
9af86f93 | 5022 | INIT_LIST_HEAD(&sublist); |
88eb1944 EC |
5023 | list_for_each_entry_safe(skb, next, head, list) { |
5024 | struct net_device *orig_dev = skb->dev; | |
5025 | struct packet_type *pt_prev = NULL; | |
5026 | ||
22f6bbb7 | 5027 | skb_list_del_init(skb); |
335b7c12 | 5028 | __netif_receive_skb_core(&skb, pfmemalloc, &pt_prev); |
9af86f93 EC |
5029 | if (!pt_prev) |
5030 | continue; | |
88eb1944 EC |
5031 | if (pt_curr != pt_prev || od_curr != orig_dev) { |
5032 | /* dispatch old sublist */ | |
88eb1944 EC |
5033 | __netif_receive_skb_list_ptype(&sublist, pt_curr, od_curr); |
5034 | /* start new sublist */ | |
9af86f93 | 5035 | INIT_LIST_HEAD(&sublist); |
88eb1944 EC |
5036 | pt_curr = pt_prev; |
5037 | od_curr = orig_dev; | |
5038 | } | |
9af86f93 | 5039 | list_add_tail(&skb->list, &sublist); |
88eb1944 EC |
5040 | } |
5041 | ||
5042 | /* dispatch final sublist */ | |
9af86f93 | 5043 | __netif_receive_skb_list_ptype(&sublist, pt_curr, od_curr); |
4ce0017a EC |
5044 | } |
5045 | ||
9754e293 DM |
5046 | static int __netif_receive_skb(struct sk_buff *skb) |
5047 | { | |
5048 | int ret; | |
5049 | ||
5050 | if (sk_memalloc_socks() && skb_pfmemalloc(skb)) { | |
f1083048 | 5051 | unsigned int noreclaim_flag; |
9754e293 DM |
5052 | |
5053 | /* | |
5054 | * PFMEMALLOC skbs are special, they should | |
5055 | * - be delivered to SOCK_MEMALLOC sockets only | |
5056 | * - stay away from userspace | |
5057 | * - have bounded memory usage | |
5058 | * | |
5059 | * Use PF_MEMALLOC as this saves us from propagating the allocation | |
5060 | * context down to all allocation sites. | |
5061 | */ | |
f1083048 | 5062 | noreclaim_flag = memalloc_noreclaim_save(); |
88eb1944 | 5063 | ret = __netif_receive_skb_one_core(skb, true); |
f1083048 | 5064 | memalloc_noreclaim_restore(noreclaim_flag); |
9754e293 | 5065 | } else |
88eb1944 | 5066 | ret = __netif_receive_skb_one_core(skb, false); |
9754e293 | 5067 | |
1da177e4 LT |
5068 | return ret; |
5069 | } | |
0a9627f2 | 5070 | |
4ce0017a EC |
5071 | static void __netif_receive_skb_list(struct list_head *head) |
5072 | { | |
5073 | unsigned long noreclaim_flag = 0; | |
5074 | struct sk_buff *skb, *next; | |
5075 | bool pfmemalloc = false; /* Is current sublist PF_MEMALLOC? */ | |
5076 | ||
5077 | list_for_each_entry_safe(skb, next, head, list) { | |
5078 | if ((sk_memalloc_socks() && skb_pfmemalloc(skb)) != pfmemalloc) { | |
5079 | struct list_head sublist; | |
5080 | ||
5081 | /* Handle the previous sublist */ | |
5082 | list_cut_before(&sublist, head, &skb->list); | |
b9f463d6 EC |
5083 | if (!list_empty(&sublist)) |
5084 | __netif_receive_skb_list_core(&sublist, pfmemalloc); | |
4ce0017a EC |
5085 | pfmemalloc = !pfmemalloc; |
5086 | /* See comments in __netif_receive_skb */ | |
5087 | if (pfmemalloc) | |
5088 | noreclaim_flag = memalloc_noreclaim_save(); | |
5089 | else | |
5090 | memalloc_noreclaim_restore(noreclaim_flag); | |
5091 | } | |
5092 | } | |
5093 | /* Handle the remaining sublist */ | |
b9f463d6 EC |
5094 | if (!list_empty(head)) |
5095 | __netif_receive_skb_list_core(head, pfmemalloc); | |
4ce0017a EC |
5096 | /* Restore pflags */ |
5097 | if (pfmemalloc) | |
5098 | memalloc_noreclaim_restore(noreclaim_flag); | |
5099 | } | |
5100 | ||
f4e63525 | 5101 | static int generic_xdp_install(struct net_device *dev, struct netdev_bpf *xdp) |
b5cdae32 | 5102 | { |
58038695 | 5103 | struct bpf_prog *old = rtnl_dereference(dev->xdp_prog); |
b5cdae32 DM |
5104 | struct bpf_prog *new = xdp->prog; |
5105 | int ret = 0; | |
5106 | ||
5107 | switch (xdp->command) { | |
58038695 | 5108 | case XDP_SETUP_PROG: |
b5cdae32 DM |
5109 | rcu_assign_pointer(dev->xdp_prog, new); |
5110 | if (old) | |
5111 | bpf_prog_put(old); | |
5112 | ||
5113 | if (old && !new) { | |
02786475 | 5114 | static_branch_dec(&generic_xdp_needed_key); |
b5cdae32 | 5115 | } else if (new && !old) { |
02786475 | 5116 | static_branch_inc(&generic_xdp_needed_key); |
b5cdae32 | 5117 | dev_disable_lro(dev); |
56f5aa77 | 5118 | dev_disable_gro_hw(dev); |
b5cdae32 DM |
5119 | } |
5120 | break; | |
b5cdae32 DM |
5121 | |
5122 | case XDP_QUERY_PROG: | |
58038695 | 5123 | xdp->prog_id = old ? old->aux->id : 0; |
b5cdae32 DM |
5124 | break; |
5125 | ||
5126 | default: | |
5127 | ret = -EINVAL; | |
5128 | break; | |
5129 | } | |
5130 | ||
5131 | return ret; | |
5132 | } | |
5133 | ||
ae78dbfa | 5134 | static int netif_receive_skb_internal(struct sk_buff *skb) |
0a9627f2 | 5135 | { |
2c17d27c JA |
5136 | int ret; |
5137 | ||
588f0330 | 5138 | net_timestamp_check(netdev_tstamp_prequeue, skb); |
3b098e2d | 5139 | |
c1f19b51 RC |
5140 | if (skb_defer_rx_timestamp(skb)) |
5141 | return NET_RX_SUCCESS; | |
5142 | ||
bbbe211c | 5143 | rcu_read_lock(); |
df334545 | 5144 | #ifdef CONFIG_RPS |
dc05360f | 5145 | if (static_branch_unlikely(&rps_needed)) { |
3b098e2d | 5146 | struct rps_dev_flow voidflow, *rflow = &voidflow; |
2c17d27c | 5147 | int cpu = get_rps_cpu(skb->dev, skb, &rflow); |
0a9627f2 | 5148 | |
3b098e2d ED |
5149 | if (cpu >= 0) { |
5150 | ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail); | |
5151 | rcu_read_unlock(); | |
adc9300e | 5152 | return ret; |
3b098e2d | 5153 | } |
fec5e652 | 5154 | } |
1e94d72f | 5155 | #endif |
2c17d27c JA |
5156 | ret = __netif_receive_skb(skb); |
5157 | rcu_read_unlock(); | |
5158 | return ret; | |
0a9627f2 | 5159 | } |
ae78dbfa | 5160 | |
7da517a3 EC |
5161 | static void netif_receive_skb_list_internal(struct list_head *head) |
5162 | { | |
7da517a3 | 5163 | struct sk_buff *skb, *next; |
8c057efa | 5164 | struct list_head sublist; |
7da517a3 | 5165 | |
8c057efa | 5166 | INIT_LIST_HEAD(&sublist); |
7da517a3 EC |
5167 | list_for_each_entry_safe(skb, next, head, list) { |
5168 | net_timestamp_check(netdev_tstamp_prequeue, skb); | |
22f6bbb7 | 5169 | skb_list_del_init(skb); |
8c057efa EC |
5170 | if (!skb_defer_rx_timestamp(skb)) |
5171 | list_add_tail(&skb->list, &sublist); | |
7da517a3 | 5172 | } |
8c057efa | 5173 | list_splice_init(&sublist, head); |
7da517a3 | 5174 | |
7da517a3 EC |
5175 | rcu_read_lock(); |
5176 | #ifdef CONFIG_RPS | |
dc05360f | 5177 | if (static_branch_unlikely(&rps_needed)) { |
7da517a3 EC |
5178 | list_for_each_entry_safe(skb, next, head, list) { |
5179 | struct rps_dev_flow voidflow, *rflow = &voidflow; | |
5180 | int cpu = get_rps_cpu(skb->dev, skb, &rflow); | |
5181 | ||
5182 | if (cpu >= 0) { | |
8c057efa | 5183 | /* Will be handled, remove from list */ |
22f6bbb7 | 5184 | skb_list_del_init(skb); |
8c057efa | 5185 | enqueue_to_backlog(skb, cpu, &rflow->last_qtail); |
7da517a3 EC |
5186 | } |
5187 | } | |
5188 | } | |
5189 | #endif | |
5190 | __netif_receive_skb_list(head); | |
5191 | rcu_read_unlock(); | |
5192 | } | |
5193 | ||
ae78dbfa BH |
5194 | /** |
5195 | * netif_receive_skb - process receive buffer from network | |
5196 | * @skb: buffer to process | |
5197 | * | |
5198 | * netif_receive_skb() is the main receive data processing function. | |
5199 | * It always succeeds. The buffer may be dropped during processing | |
5200 | * for congestion control or by the protocol layers. | |
5201 | * | |
5202 | * This function may only be called from softirq context and interrupts | |
5203 | * should be enabled. | |
5204 | * | |
5205 | * Return values (usually ignored): | |
5206 | * NET_RX_SUCCESS: no congestion | |
5207 | * NET_RX_DROP: packet was dropped | |
5208 | */ | |
04eb4489 | 5209 | int netif_receive_skb(struct sk_buff *skb) |
ae78dbfa | 5210 | { |
b0e3f1bd GB |
5211 | int ret; |
5212 | ||
ae78dbfa BH |
5213 | trace_netif_receive_skb_entry(skb); |
5214 | ||
b0e3f1bd GB |
5215 | ret = netif_receive_skb_internal(skb); |
5216 | trace_netif_receive_skb_exit(ret); | |
5217 | ||
5218 | return ret; | |
ae78dbfa | 5219 | } |
04eb4489 | 5220 | EXPORT_SYMBOL(netif_receive_skb); |
1da177e4 | 5221 | |
f6ad8c1b EC |
5222 | /** |
5223 | * netif_receive_skb_list - process many receive buffers from network | |
5224 | * @head: list of skbs to process. | |
5225 | * | |
7da517a3 EC |
5226 | * Since return value of netif_receive_skb() is normally ignored, and |
5227 | * wouldn't be meaningful for a list, this function returns void. | |
f6ad8c1b EC |
5228 | * |
5229 | * This function may only be called from softirq context and interrupts | |
5230 | * should be enabled. | |
5231 | */ | |
5232 | void netif_receive_skb_list(struct list_head *head) | |
5233 | { | |
7da517a3 | 5234 | struct sk_buff *skb; |
f6ad8c1b | 5235 | |
b9f463d6 EC |
5236 | if (list_empty(head)) |
5237 | return; | |
b0e3f1bd GB |
5238 | if (trace_netif_receive_skb_list_entry_enabled()) { |
5239 | list_for_each_entry(skb, head, list) | |
5240 | trace_netif_receive_skb_list_entry(skb); | |
5241 | } | |
7da517a3 | 5242 | netif_receive_skb_list_internal(head); |
b0e3f1bd | 5243 | trace_netif_receive_skb_list_exit(0); |
f6ad8c1b EC |
5244 | } |
5245 | EXPORT_SYMBOL(netif_receive_skb_list); | |
5246 | ||
41852497 | 5247 | DEFINE_PER_CPU(struct work_struct, flush_works); |
145dd5f9 PA |
5248 | |
5249 | /* Network device is going away, flush any packets still pending */ | |
5250 | static void flush_backlog(struct work_struct *work) | |
6e583ce5 | 5251 | { |
6e583ce5 | 5252 | struct sk_buff *skb, *tmp; |
145dd5f9 PA |
5253 | struct softnet_data *sd; |
5254 | ||
5255 | local_bh_disable(); | |
5256 | sd = this_cpu_ptr(&softnet_data); | |
6e583ce5 | 5257 | |
145dd5f9 | 5258 | local_irq_disable(); |
e36fa2f7 | 5259 | rps_lock(sd); |
6e7676c1 | 5260 | skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) { |
41852497 | 5261 | if (skb->dev->reg_state == NETREG_UNREGISTERING) { |
e36fa2f7 | 5262 | __skb_unlink(skb, &sd->input_pkt_queue); |
d443cad1 | 5263 | dev_kfree_skb_irq(skb); |
76cc8b13 | 5264 | input_queue_head_incr(sd); |
6e583ce5 | 5265 | } |
6e7676c1 | 5266 | } |
e36fa2f7 | 5267 | rps_unlock(sd); |
145dd5f9 | 5268 | local_irq_enable(); |
6e7676c1 CG |
5269 | |
5270 | skb_queue_walk_safe(&sd->process_queue, skb, tmp) { | |
41852497 | 5271 | if (skb->dev->reg_state == NETREG_UNREGISTERING) { |
6e7676c1 CG |
5272 | __skb_unlink(skb, &sd->process_queue); |
5273 | kfree_skb(skb); | |
76cc8b13 | 5274 | input_queue_head_incr(sd); |
6e7676c1 CG |
5275 | } |
5276 | } | |
145dd5f9 PA |
5277 | local_bh_enable(); |
5278 | } | |
5279 | ||
41852497 | 5280 | static void flush_all_backlogs(void) |
145dd5f9 PA |
5281 | { |
5282 | unsigned int cpu; | |
5283 | ||
5284 | get_online_cpus(); | |
5285 | ||
41852497 ED |
5286 | for_each_online_cpu(cpu) |
5287 | queue_work_on(cpu, system_highpri_wq, | |
5288 | per_cpu_ptr(&flush_works, cpu)); | |
145dd5f9 PA |
5289 | |
5290 | for_each_online_cpu(cpu) | |
41852497 | 5291 | flush_work(per_cpu_ptr(&flush_works, cpu)); |
145dd5f9 PA |
5292 | |
5293 | put_online_cpus(); | |
6e583ce5 SH |
5294 | } |
5295 | ||
8c33c6ce MM |
5296 | /* Pass the currently batched GRO_NORMAL SKBs up to the stack. */ |
5297 | static void gro_normal_list(struct napi_struct *napi) | |
5298 | { | |
5299 | if (!napi->rx_count) | |
5300 | return; | |
5301 | netif_receive_skb_list_internal(&napi->rx_list); | |
5302 | INIT_LIST_HEAD(&napi->rx_list); | |
5303 | napi->rx_count = 0; | |
5304 | } | |
5305 | ||
5306 | /* Queue one GRO_NORMAL SKB up for list processing. If batch size exceeded, | |
5307 | * pass the whole batch up to the stack. | |
5308 | */ | |
edcb350e | 5309 | static void gro_normal_one(struct napi_struct *napi, struct sk_buff *skb, int segs) |
8c33c6ce MM |
5310 | { |
5311 | list_add_tail(&skb->list, &napi->rx_list); | |
edcb350e ED |
5312 | napi->rx_count += segs; |
5313 | if (napi->rx_count >= gro_normal_batch) | |
8c33c6ce MM |
5314 | gro_normal_list(napi); |
5315 | } | |
5316 | ||
aaa5d90b PA |
5317 | INDIRECT_CALLABLE_DECLARE(int inet_gro_complete(struct sk_buff *, int)); |
5318 | INDIRECT_CALLABLE_DECLARE(int ipv6_gro_complete(struct sk_buff *, int)); | |
8c33c6ce | 5319 | static int napi_gro_complete(struct napi_struct *napi, struct sk_buff *skb) |
d565b0a1 | 5320 | { |
22061d80 | 5321 | struct packet_offload *ptype; |
d565b0a1 | 5322 | __be16 type = skb->protocol; |
22061d80 | 5323 | struct list_head *head = &offload_base; |
d565b0a1 HX |
5324 | int err = -ENOENT; |
5325 | ||
c3c7c254 ED |
5326 | BUILD_BUG_ON(sizeof(struct napi_gro_cb) > sizeof(skb->cb)); |
5327 | ||
fc59f9a3 HX |
5328 | if (NAPI_GRO_CB(skb)->count == 1) { |
5329 | skb_shinfo(skb)->gso_size = 0; | |
d565b0a1 | 5330 | goto out; |
fc59f9a3 | 5331 | } |
d565b0a1 HX |
5332 | |
5333 | rcu_read_lock(); | |
5334 | list_for_each_entry_rcu(ptype, head, list) { | |
f191a1d1 | 5335 | if (ptype->type != type || !ptype->callbacks.gro_complete) |
d565b0a1 HX |
5336 | continue; |
5337 | ||
aaa5d90b PA |
5338 | err = INDIRECT_CALL_INET(ptype->callbacks.gro_complete, |
5339 | ipv6_gro_complete, inet_gro_complete, | |
5340 | skb, 0); | |
d565b0a1 HX |
5341 | break; |
5342 | } | |
5343 | rcu_read_unlock(); | |
5344 | ||
5345 | if (err) { | |
5346 | WARN_ON(&ptype->list == head); | |
5347 | kfree_skb(skb); | |
5348 | return NET_RX_SUCCESS; | |
5349 | } | |
5350 | ||
5351 | out: | |
edcb350e | 5352 | gro_normal_one(napi, skb, NAPI_GRO_CB(skb)->count); |
8c33c6ce | 5353 | return NET_RX_SUCCESS; |
d565b0a1 HX |
5354 | } |
5355 | ||
6312fe77 | 5356 | static void __napi_gro_flush_chain(struct napi_struct *napi, u32 index, |
07d78363 | 5357 | bool flush_old) |
d565b0a1 | 5358 | { |
6312fe77 | 5359 | struct list_head *head = &napi->gro_hash[index].list; |
d4546c25 | 5360 | struct sk_buff *skb, *p; |
2e71a6f8 | 5361 | |
07d78363 | 5362 | list_for_each_entry_safe_reverse(skb, p, head, list) { |
2e71a6f8 ED |
5363 | if (flush_old && NAPI_GRO_CB(skb)->age == jiffies) |
5364 | return; | |
992cba7e | 5365 | skb_list_del_init(skb); |
8c33c6ce | 5366 | napi_gro_complete(napi, skb); |
6312fe77 | 5367 | napi->gro_hash[index].count--; |
d565b0a1 | 5368 | } |
d9f37d01 LR |
5369 | |
5370 | if (!napi->gro_hash[index].count) | |
5371 | __clear_bit(index, &napi->gro_bitmask); | |
d565b0a1 | 5372 | } |
07d78363 | 5373 | |
6312fe77 | 5374 | /* napi->gro_hash[].list contains packets ordered by age. |
07d78363 DM |
5375 | * youngest packets at the head of it. |
5376 | * Complete skbs in reverse order to reduce latencies. | |
5377 | */ | |
5378 | void napi_gro_flush(struct napi_struct *napi, bool flush_old) | |
5379 | { | |
42519ede ED |
5380 | unsigned long bitmask = napi->gro_bitmask; |
5381 | unsigned int i, base = ~0U; | |
07d78363 | 5382 | |
42519ede ED |
5383 | while ((i = ffs(bitmask)) != 0) { |
5384 | bitmask >>= i; | |
5385 | base += i; | |
5386 | __napi_gro_flush_chain(napi, base, flush_old); | |
d9f37d01 | 5387 | } |
07d78363 | 5388 | } |
86cac58b | 5389 | EXPORT_SYMBOL(napi_gro_flush); |
d565b0a1 | 5390 | |
07d78363 DM |
5391 | static struct list_head *gro_list_prepare(struct napi_struct *napi, |
5392 | struct sk_buff *skb) | |
89c5fa33 | 5393 | { |
89c5fa33 | 5394 | unsigned int maclen = skb->dev->hard_header_len; |
0b4cec8c | 5395 | u32 hash = skb_get_hash_raw(skb); |
07d78363 | 5396 | struct list_head *head; |
d4546c25 | 5397 | struct sk_buff *p; |
89c5fa33 | 5398 | |
6312fe77 | 5399 | head = &napi->gro_hash[hash & (GRO_HASH_BUCKETS - 1)].list; |
07d78363 | 5400 | list_for_each_entry(p, head, list) { |
89c5fa33 ED |
5401 | unsigned long diffs; |
5402 | ||
0b4cec8c TH |
5403 | NAPI_GRO_CB(p)->flush = 0; |
5404 | ||
5405 | if (hash != skb_get_hash_raw(p)) { | |
5406 | NAPI_GRO_CB(p)->same_flow = 0; | |
5407 | continue; | |
5408 | } | |
5409 | ||
89c5fa33 | 5410 | diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev; |
b1817524 MM |
5411 | diffs |= skb_vlan_tag_present(p) ^ skb_vlan_tag_present(skb); |
5412 | if (skb_vlan_tag_present(p)) | |
5413 | diffs |= p->vlan_tci ^ skb->vlan_tci; | |
ce87fc6c | 5414 | diffs |= skb_metadata_dst_cmp(p, skb); |
de8f3a83 | 5415 | diffs |= skb_metadata_differs(p, skb); |
89c5fa33 ED |
5416 | if (maclen == ETH_HLEN) |
5417 | diffs |= compare_ether_header(skb_mac_header(p), | |
a50e233c | 5418 | skb_mac_header(skb)); |
89c5fa33 ED |
5419 | else if (!diffs) |
5420 | diffs = memcmp(skb_mac_header(p), | |
a50e233c | 5421 | skb_mac_header(skb), |
89c5fa33 ED |
5422 | maclen); |
5423 | NAPI_GRO_CB(p)->same_flow = !diffs; | |
89c5fa33 | 5424 | } |
07d78363 DM |
5425 | |
5426 | return head; | |
89c5fa33 ED |
5427 | } |
5428 | ||
86b87182 | 5429 | static inline void skb_gro_reset_offset(struct sk_buff *skb, u32 nhoff) |
299603e8 JC |
5430 | { |
5431 | const struct skb_shared_info *pinfo = skb_shinfo(skb); | |
5432 | const skb_frag_t *frag0 = &pinfo->frags[0]; | |
5433 | ||
5434 | NAPI_GRO_CB(skb)->data_offset = 0; | |
5435 | NAPI_GRO_CB(skb)->frag0 = NULL; | |
5436 | NAPI_GRO_CB(skb)->frag0_len = 0; | |
5437 | ||
5438 | if (skb_mac_header(skb) == skb_tail_pointer(skb) && | |
5439 | pinfo->nr_frags && | |
de70157e | 5440 | !PageHighMem(skb_frag_page(frag0)) && |
86b87182 | 5441 | (!NET_IP_ALIGN || !((skb_frag_off(frag0) + nhoff) & 3))) { |
299603e8 | 5442 | NAPI_GRO_CB(skb)->frag0 = skb_frag_address(frag0); |
7cfd5fd5 ED |
5443 | NAPI_GRO_CB(skb)->frag0_len = min_t(unsigned int, |
5444 | skb_frag_size(frag0), | |
5445 | skb->end - skb->tail); | |
89c5fa33 ED |
5446 | } |
5447 | } | |
5448 | ||
a50e233c ED |
5449 | static void gro_pull_from_frag0(struct sk_buff *skb, int grow) |
5450 | { | |
5451 | struct skb_shared_info *pinfo = skb_shinfo(skb); | |
5452 | ||
5453 | BUG_ON(skb->end - skb->tail < grow); | |
5454 | ||
5455 | memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow); | |
5456 | ||
5457 | skb->data_len -= grow; | |
5458 | skb->tail += grow; | |
5459 | ||
b54c9d5b | 5460 | skb_frag_off_add(&pinfo->frags[0], grow); |
a50e233c ED |
5461 | skb_frag_size_sub(&pinfo->frags[0], grow); |
5462 | ||
5463 | if (unlikely(!skb_frag_size(&pinfo->frags[0]))) { | |
5464 | skb_frag_unref(skb, 0); | |
5465 | memmove(pinfo->frags, pinfo->frags + 1, | |
5466 | --pinfo->nr_frags * sizeof(pinfo->frags[0])); | |
5467 | } | |
5468 | } | |
5469 | ||
8c33c6ce | 5470 | static void gro_flush_oldest(struct napi_struct *napi, struct list_head *head) |
07d78363 | 5471 | { |
6312fe77 | 5472 | struct sk_buff *oldest; |
07d78363 | 5473 | |
6312fe77 | 5474 | oldest = list_last_entry(head, struct sk_buff, list); |
07d78363 | 5475 | |
6312fe77 | 5476 | /* We are called with head length >= MAX_GRO_SKBS, so this is |
07d78363 DM |
5477 | * impossible. |
5478 | */ | |
5479 | if (WARN_ON_ONCE(!oldest)) | |
5480 | return; | |
5481 | ||
d9f37d01 LR |
5482 | /* Do not adjust napi->gro_hash[].count, caller is adding a new |
5483 | * SKB to the chain. | |
07d78363 | 5484 | */ |
ece23711 | 5485 | skb_list_del_init(oldest); |
8c33c6ce | 5486 | napi_gro_complete(napi, oldest); |
07d78363 DM |
5487 | } |
5488 | ||
aaa5d90b PA |
5489 | INDIRECT_CALLABLE_DECLARE(struct sk_buff *inet_gro_receive(struct list_head *, |
5490 | struct sk_buff *)); | |
5491 | INDIRECT_CALLABLE_DECLARE(struct sk_buff *ipv6_gro_receive(struct list_head *, | |
5492 | struct sk_buff *)); | |
bb728820 | 5493 | static enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb) |
d565b0a1 | 5494 | { |
6312fe77 | 5495 | u32 hash = skb_get_hash_raw(skb) & (GRO_HASH_BUCKETS - 1); |
d4546c25 | 5496 | struct list_head *head = &offload_base; |
22061d80 | 5497 | struct packet_offload *ptype; |
d565b0a1 | 5498 | __be16 type = skb->protocol; |
07d78363 | 5499 | struct list_head *gro_head; |
d4546c25 | 5500 | struct sk_buff *pp = NULL; |
5b252f0c | 5501 | enum gro_result ret; |
d4546c25 | 5502 | int same_flow; |
a50e233c | 5503 | int grow; |
d565b0a1 | 5504 | |
b5cdae32 | 5505 | if (netif_elide_gro(skb->dev)) |
d565b0a1 HX |
5506 | goto normal; |
5507 | ||
07d78363 | 5508 | gro_head = gro_list_prepare(napi, skb); |
89c5fa33 | 5509 | |
d565b0a1 HX |
5510 | rcu_read_lock(); |
5511 | list_for_each_entry_rcu(ptype, head, list) { | |
f191a1d1 | 5512 | if (ptype->type != type || !ptype->callbacks.gro_receive) |
d565b0a1 HX |
5513 | continue; |
5514 | ||
86911732 | 5515 | skb_set_network_header(skb, skb_gro_offset(skb)); |
efd9450e | 5516 | skb_reset_mac_len(skb); |
d565b0a1 | 5517 | NAPI_GRO_CB(skb)->same_flow = 0; |
d61d072e | 5518 | NAPI_GRO_CB(skb)->flush = skb_is_gso(skb) || skb_has_frag_list(skb); |
5d38a079 | 5519 | NAPI_GRO_CB(skb)->free = 0; |
fac8e0f5 | 5520 | NAPI_GRO_CB(skb)->encap_mark = 0; |
fcd91dd4 | 5521 | NAPI_GRO_CB(skb)->recursion_counter = 0; |
a0ca153f | 5522 | NAPI_GRO_CB(skb)->is_fou = 0; |
1530545e | 5523 | NAPI_GRO_CB(skb)->is_atomic = 1; |
15e2396d | 5524 | NAPI_GRO_CB(skb)->gro_remcsum_start = 0; |
d565b0a1 | 5525 | |
662880f4 TH |
5526 | /* Setup for GRO checksum validation */ |
5527 | switch (skb->ip_summed) { | |
5528 | case CHECKSUM_COMPLETE: | |
5529 | NAPI_GRO_CB(skb)->csum = skb->csum; | |
5530 | NAPI_GRO_CB(skb)->csum_valid = 1; | |
5531 | NAPI_GRO_CB(skb)->csum_cnt = 0; | |
5532 | break; | |
5533 | case CHECKSUM_UNNECESSARY: | |
5534 | NAPI_GRO_CB(skb)->csum_cnt = skb->csum_level + 1; | |
5535 | NAPI_GRO_CB(skb)->csum_valid = 0; | |
5536 | break; | |
5537 | default: | |
5538 | NAPI_GRO_CB(skb)->csum_cnt = 0; | |
5539 | NAPI_GRO_CB(skb)->csum_valid = 0; | |
5540 | } | |
d565b0a1 | 5541 | |
aaa5d90b PA |
5542 | pp = INDIRECT_CALL_INET(ptype->callbacks.gro_receive, |
5543 | ipv6_gro_receive, inet_gro_receive, | |
5544 | gro_head, skb); | |
d565b0a1 HX |
5545 | break; |
5546 | } | |
5547 | rcu_read_unlock(); | |
5548 | ||
5549 | if (&ptype->list == head) | |
5550 | goto normal; | |
5551 | ||
25393d3f SK |
5552 | if (IS_ERR(pp) && PTR_ERR(pp) == -EINPROGRESS) { |
5553 | ret = GRO_CONSUMED; | |
5554 | goto ok; | |
5555 | } | |
5556 | ||
0da2afd5 | 5557 | same_flow = NAPI_GRO_CB(skb)->same_flow; |
5d0d9be8 | 5558 | ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED; |
0da2afd5 | 5559 | |
d565b0a1 | 5560 | if (pp) { |
992cba7e | 5561 | skb_list_del_init(pp); |
8c33c6ce | 5562 | napi_gro_complete(napi, pp); |
6312fe77 | 5563 | napi->gro_hash[hash].count--; |
d565b0a1 HX |
5564 | } |
5565 | ||
0da2afd5 | 5566 | if (same_flow) |
d565b0a1 HX |
5567 | goto ok; |
5568 | ||
600adc18 | 5569 | if (NAPI_GRO_CB(skb)->flush) |
d565b0a1 | 5570 | goto normal; |
d565b0a1 | 5571 | |
6312fe77 | 5572 | if (unlikely(napi->gro_hash[hash].count >= MAX_GRO_SKBS)) { |
8c33c6ce | 5573 | gro_flush_oldest(napi, gro_head); |
600adc18 | 5574 | } else { |
6312fe77 | 5575 | napi->gro_hash[hash].count++; |
600adc18 | 5576 | } |
d565b0a1 | 5577 | NAPI_GRO_CB(skb)->count = 1; |
2e71a6f8 | 5578 | NAPI_GRO_CB(skb)->age = jiffies; |
29e98242 | 5579 | NAPI_GRO_CB(skb)->last = skb; |
86911732 | 5580 | skb_shinfo(skb)->gso_size = skb_gro_len(skb); |
07d78363 | 5581 | list_add(&skb->list, gro_head); |
5d0d9be8 | 5582 | ret = GRO_HELD; |
d565b0a1 | 5583 | |
ad0f9904 | 5584 | pull: |
a50e233c ED |
5585 | grow = skb_gro_offset(skb) - skb_headlen(skb); |
5586 | if (grow > 0) | |
5587 | gro_pull_from_frag0(skb, grow); | |
d565b0a1 | 5588 | ok: |
d9f37d01 LR |
5589 | if (napi->gro_hash[hash].count) { |
5590 | if (!test_bit(hash, &napi->gro_bitmask)) | |
5591 | __set_bit(hash, &napi->gro_bitmask); | |
5592 | } else if (test_bit(hash, &napi->gro_bitmask)) { | |
5593 | __clear_bit(hash, &napi->gro_bitmask); | |
5594 | } | |
5595 | ||
5d0d9be8 | 5596 | return ret; |
d565b0a1 HX |
5597 | |
5598 | normal: | |
ad0f9904 HX |
5599 | ret = GRO_NORMAL; |
5600 | goto pull; | |
5d38a079 | 5601 | } |
96e93eab | 5602 | |
bf5a755f JC |
5603 | struct packet_offload *gro_find_receive_by_type(__be16 type) |
5604 | { | |
5605 | struct list_head *offload_head = &offload_base; | |
5606 | struct packet_offload *ptype; | |
5607 | ||
5608 | list_for_each_entry_rcu(ptype, offload_head, list) { | |
5609 | if (ptype->type != type || !ptype->callbacks.gro_receive) | |
5610 | continue; | |
5611 | return ptype; | |
5612 | } | |
5613 | return NULL; | |
5614 | } | |
e27a2f83 | 5615 | EXPORT_SYMBOL(gro_find_receive_by_type); |
bf5a755f JC |
5616 | |
5617 | struct packet_offload *gro_find_complete_by_type(__be16 type) | |
5618 | { | |
5619 | struct list_head *offload_head = &offload_base; | |
5620 | struct packet_offload *ptype; | |
5621 | ||
5622 | list_for_each_entry_rcu(ptype, offload_head, list) { | |
5623 | if (ptype->type != type || !ptype->callbacks.gro_complete) | |
5624 | continue; | |
5625 | return ptype; | |
5626 | } | |
5627 | return NULL; | |
5628 | } | |
e27a2f83 | 5629 | EXPORT_SYMBOL(gro_find_complete_by_type); |
5d38a079 | 5630 | |
e44699d2 MK |
5631 | static void napi_skb_free_stolen_head(struct sk_buff *skb) |
5632 | { | |
5633 | skb_dst_drop(skb); | |
174e2381 | 5634 | skb_ext_put(skb); |
e44699d2 MK |
5635 | kmem_cache_free(skbuff_head_cache, skb); |
5636 | } | |
5637 | ||
cf639bc9 AL |
5638 | static gro_result_t napi_skb_finish(struct napi_struct *napi, |
5639 | struct sk_buff *skb, | |
5640 | gro_result_t ret) | |
5d38a079 | 5641 | { |
5d0d9be8 HX |
5642 | switch (ret) { |
5643 | case GRO_NORMAL: | |
edcb350e | 5644 | gro_normal_one(napi, skb, 1); |
c7c4b3b6 | 5645 | break; |
5d38a079 | 5646 | |
5d0d9be8 | 5647 | case GRO_DROP: |
5d38a079 HX |
5648 | kfree_skb(skb); |
5649 | break; | |
5b252f0c | 5650 | |
daa86548 | 5651 | case GRO_MERGED_FREE: |
e44699d2 MK |
5652 | if (NAPI_GRO_CB(skb)->free == NAPI_GRO_FREE_STOLEN_HEAD) |
5653 | napi_skb_free_stolen_head(skb); | |
5654 | else | |
d7e8883c | 5655 | __kfree_skb(skb); |
daa86548 ED |
5656 | break; |
5657 | ||
5b252f0c BH |
5658 | case GRO_HELD: |
5659 | case GRO_MERGED: | |
25393d3f | 5660 | case GRO_CONSUMED: |
5b252f0c | 5661 | break; |
5d38a079 HX |
5662 | } |
5663 | ||
c7c4b3b6 | 5664 | return ret; |
5d0d9be8 | 5665 | } |
5d0d9be8 | 5666 | |
c7c4b3b6 | 5667 | gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb) |
5d0d9be8 | 5668 | { |
b0e3f1bd GB |
5669 | gro_result_t ret; |
5670 | ||
93f93a44 | 5671 | skb_mark_napi_id(skb, napi); |
ae78dbfa | 5672 | trace_napi_gro_receive_entry(skb); |
86911732 | 5673 | |
86b87182 | 5674 | skb_gro_reset_offset(skb, 0); |
a50e233c | 5675 | |
cf639bc9 | 5676 | ret = napi_skb_finish(napi, skb, dev_gro_receive(napi, skb)); |
b0e3f1bd GB |
5677 | trace_napi_gro_receive_exit(ret); |
5678 | ||
5679 | return ret; | |
d565b0a1 HX |
5680 | } |
5681 | EXPORT_SYMBOL(napi_gro_receive); | |
5682 | ||
d0c2b0d2 | 5683 | static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb) |
96e93eab | 5684 | { |
93a35f59 ED |
5685 | if (unlikely(skb->pfmemalloc)) { |
5686 | consume_skb(skb); | |
5687 | return; | |
5688 | } | |
96e93eab | 5689 | __skb_pull(skb, skb_headlen(skb)); |
2a2a459e ED |
5690 | /* restore the reserve we had after netdev_alloc_skb_ip_align() */ |
5691 | skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN - skb_headroom(skb)); | |
b1817524 | 5692 | __vlan_hwaccel_clear_tag(skb); |
66c46d74 | 5693 | skb->dev = napi->dev; |
6d152e23 | 5694 | skb->skb_iif = 0; |
33d9a2c7 ED |
5695 | |
5696 | /* eth_type_trans() assumes pkt_type is PACKET_HOST */ | |
5697 | skb->pkt_type = PACKET_HOST; | |
5698 | ||
c3caf119 JC |
5699 | skb->encapsulation = 0; |
5700 | skb_shinfo(skb)->gso_type = 0; | |
e33d0ba8 | 5701 | skb->truesize = SKB_TRUESIZE(skb_end_offset(skb)); |
174e2381 | 5702 | skb_ext_reset(skb); |
96e93eab HX |
5703 | |
5704 | napi->skb = skb; | |
5705 | } | |
96e93eab | 5706 | |
76620aaf | 5707 | struct sk_buff *napi_get_frags(struct napi_struct *napi) |
5d38a079 | 5708 | { |
5d38a079 | 5709 | struct sk_buff *skb = napi->skb; |
5d38a079 HX |
5710 | |
5711 | if (!skb) { | |
fd11a83d | 5712 | skb = napi_alloc_skb(napi, GRO_MAX_HEAD); |
e2f9dc3b ED |
5713 | if (skb) { |
5714 | napi->skb = skb; | |
5715 | skb_mark_napi_id(skb, napi); | |
5716 | } | |
80595d59 | 5717 | } |
96e93eab HX |
5718 | return skb; |
5719 | } | |
76620aaf | 5720 | EXPORT_SYMBOL(napi_get_frags); |
96e93eab | 5721 | |
a50e233c ED |
5722 | static gro_result_t napi_frags_finish(struct napi_struct *napi, |
5723 | struct sk_buff *skb, | |
5724 | gro_result_t ret) | |
96e93eab | 5725 | { |
5d0d9be8 HX |
5726 | switch (ret) { |
5727 | case GRO_NORMAL: | |
a50e233c ED |
5728 | case GRO_HELD: |
5729 | __skb_push(skb, ETH_HLEN); | |
5730 | skb->protocol = eth_type_trans(skb, skb->dev); | |
323ebb61 | 5731 | if (ret == GRO_NORMAL) |
edcb350e | 5732 | gro_normal_one(napi, skb, 1); |
86911732 | 5733 | break; |
5d38a079 | 5734 | |
5d0d9be8 | 5735 | case GRO_DROP: |
5d0d9be8 HX |
5736 | napi_reuse_skb(napi, skb); |
5737 | break; | |
5b252f0c | 5738 | |
e44699d2 MK |
5739 | case GRO_MERGED_FREE: |
5740 | if (NAPI_GRO_CB(skb)->free == NAPI_GRO_FREE_STOLEN_HEAD) | |
5741 | napi_skb_free_stolen_head(skb); | |
5742 | else | |
5743 | napi_reuse_skb(napi, skb); | |
5744 | break; | |
5745 | ||
5b252f0c | 5746 | case GRO_MERGED: |
25393d3f | 5747 | case GRO_CONSUMED: |
5b252f0c | 5748 | break; |
5d0d9be8 | 5749 | } |
5d38a079 | 5750 | |
c7c4b3b6 | 5751 | return ret; |
5d38a079 | 5752 | } |
5d0d9be8 | 5753 | |
a50e233c ED |
5754 | /* Upper GRO stack assumes network header starts at gro_offset=0 |
5755 | * Drivers could call both napi_gro_frags() and napi_gro_receive() | |
5756 | * We copy ethernet header into skb->data to have a common layout. | |
5757 | */ | |
4adb9c4a | 5758 | static struct sk_buff *napi_frags_skb(struct napi_struct *napi) |
76620aaf HX |
5759 | { |
5760 | struct sk_buff *skb = napi->skb; | |
a50e233c ED |
5761 | const struct ethhdr *eth; |
5762 | unsigned int hlen = sizeof(*eth); | |
76620aaf HX |
5763 | |
5764 | napi->skb = NULL; | |
5765 | ||
a50e233c | 5766 | skb_reset_mac_header(skb); |
86b87182 | 5767 | skb_gro_reset_offset(skb, hlen); |
a50e233c | 5768 | |
a50e233c ED |
5769 | if (unlikely(skb_gro_header_hard(skb, hlen))) { |
5770 | eth = skb_gro_header_slow(skb, hlen, 0); | |
5771 | if (unlikely(!eth)) { | |
4da46ceb AC |
5772 | net_warn_ratelimited("%s: dropping impossible skb from %s\n", |
5773 | __func__, napi->dev->name); | |
a50e233c ED |
5774 | napi_reuse_skb(napi, skb); |
5775 | return NULL; | |
5776 | } | |
5777 | } else { | |
a4270d67 | 5778 | eth = (const struct ethhdr *)skb->data; |
a50e233c ED |
5779 | gro_pull_from_frag0(skb, hlen); |
5780 | NAPI_GRO_CB(skb)->frag0 += hlen; | |
5781 | NAPI_GRO_CB(skb)->frag0_len -= hlen; | |
76620aaf | 5782 | } |
a50e233c ED |
5783 | __skb_pull(skb, hlen); |
5784 | ||
5785 | /* | |
5786 | * This works because the only protocols we care about don't require | |
5787 | * special handling. | |
5788 | * We'll fix it up properly in napi_frags_finish() | |
5789 | */ | |
5790 | skb->protocol = eth->h_proto; | |
76620aaf | 5791 | |
76620aaf HX |
5792 | return skb; |
5793 | } | |
76620aaf | 5794 | |
c7c4b3b6 | 5795 | gro_result_t napi_gro_frags(struct napi_struct *napi) |
5d0d9be8 | 5796 | { |
b0e3f1bd | 5797 | gro_result_t ret; |
76620aaf | 5798 | struct sk_buff *skb = napi_frags_skb(napi); |
5d0d9be8 HX |
5799 | |
5800 | if (!skb) | |
c7c4b3b6 | 5801 | return GRO_DROP; |
5d0d9be8 | 5802 | |
ae78dbfa BH |
5803 | trace_napi_gro_frags_entry(skb); |
5804 | ||
b0e3f1bd GB |
5805 | ret = napi_frags_finish(napi, skb, dev_gro_receive(napi, skb)); |
5806 | trace_napi_gro_frags_exit(ret); | |
5807 | ||
5808 | return ret; | |
5d0d9be8 | 5809 | } |
5d38a079 HX |
5810 | EXPORT_SYMBOL(napi_gro_frags); |
5811 | ||
573e8fca TH |
5812 | /* Compute the checksum from gro_offset and return the folded value |
5813 | * after adding in any pseudo checksum. | |
5814 | */ | |
5815 | __sum16 __skb_gro_checksum_complete(struct sk_buff *skb) | |
5816 | { | |
5817 | __wsum wsum; | |
5818 | __sum16 sum; | |
5819 | ||
5820 | wsum = skb_checksum(skb, skb_gro_offset(skb), skb_gro_len(skb), 0); | |
5821 | ||
5822 | /* NAPI_GRO_CB(skb)->csum holds pseudo checksum */ | |
5823 | sum = csum_fold(csum_add(NAPI_GRO_CB(skb)->csum, wsum)); | |
14641931 | 5824 | /* See comments in __skb_checksum_complete(). */ |
573e8fca TH |
5825 | if (likely(!sum)) { |
5826 | if (unlikely(skb->ip_summed == CHECKSUM_COMPLETE) && | |
5827 | !skb->csum_complete_sw) | |
7fe50ac8 | 5828 | netdev_rx_csum_fault(skb->dev, skb); |
573e8fca TH |
5829 | } |
5830 | ||
5831 | NAPI_GRO_CB(skb)->csum = wsum; | |
5832 | NAPI_GRO_CB(skb)->csum_valid = 1; | |
5833 | ||
5834 | return sum; | |
5835 | } | |
5836 | EXPORT_SYMBOL(__skb_gro_checksum_complete); | |
5837 | ||
773fc8f6 | 5838 | static void net_rps_send_ipi(struct softnet_data *remsd) |
5839 | { | |
5840 | #ifdef CONFIG_RPS | |
5841 | while (remsd) { | |
5842 | struct softnet_data *next = remsd->rps_ipi_next; | |
5843 | ||
5844 | if (cpu_online(remsd->cpu)) | |
5845 | smp_call_function_single_async(remsd->cpu, &remsd->csd); | |
5846 | remsd = next; | |
5847 | } | |
5848 | #endif | |
5849 | } | |
5850 | ||
e326bed2 | 5851 | /* |
855abcf0 | 5852 | * net_rps_action_and_irq_enable sends any pending IPI's for rps. |
e326bed2 ED |
5853 | * Note: called with local irq disabled, but exits with local irq enabled. |
5854 | */ | |
5855 | static void net_rps_action_and_irq_enable(struct softnet_data *sd) | |
5856 | { | |
5857 | #ifdef CONFIG_RPS | |
5858 | struct softnet_data *remsd = sd->rps_ipi_list; | |
5859 | ||
5860 | if (remsd) { | |
5861 | sd->rps_ipi_list = NULL; | |
5862 | ||
5863 | local_irq_enable(); | |
5864 | ||
5865 | /* Send pending IPI's to kick RPS processing on remote cpus. */ | |
773fc8f6 | 5866 | net_rps_send_ipi(remsd); |
e326bed2 ED |
5867 | } else |
5868 | #endif | |
5869 | local_irq_enable(); | |
5870 | } | |
5871 | ||
d75b1ade ED |
5872 | static bool sd_has_rps_ipi_waiting(struct softnet_data *sd) |
5873 | { | |
5874 | #ifdef CONFIG_RPS | |
5875 | return sd->rps_ipi_list != NULL; | |
5876 | #else | |
5877 | return false; | |
5878 | #endif | |
5879 | } | |
5880 | ||
bea3348e | 5881 | static int process_backlog(struct napi_struct *napi, int quota) |
1da177e4 | 5882 | { |
eecfd7c4 | 5883 | struct softnet_data *sd = container_of(napi, struct softnet_data, backlog); |
145dd5f9 PA |
5884 | bool again = true; |
5885 | int work = 0; | |
1da177e4 | 5886 | |
e326bed2 ED |
5887 | /* Check if we have pending ipi, its better to send them now, |
5888 | * not waiting net_rx_action() end. | |
5889 | */ | |
d75b1ade | 5890 | if (sd_has_rps_ipi_waiting(sd)) { |
e326bed2 ED |
5891 | local_irq_disable(); |
5892 | net_rps_action_and_irq_enable(sd); | |
5893 | } | |
d75b1ade | 5894 | |
3d48b53f | 5895 | napi->weight = dev_rx_weight; |
145dd5f9 | 5896 | while (again) { |
1da177e4 | 5897 | struct sk_buff *skb; |
6e7676c1 CG |
5898 | |
5899 | while ((skb = __skb_dequeue(&sd->process_queue))) { | |
2c17d27c | 5900 | rcu_read_lock(); |
6e7676c1 | 5901 | __netif_receive_skb(skb); |
2c17d27c | 5902 | rcu_read_unlock(); |
76cc8b13 | 5903 | input_queue_head_incr(sd); |
145dd5f9 | 5904 | if (++work >= quota) |
76cc8b13 | 5905 | return work; |
145dd5f9 | 5906 | |
6e7676c1 | 5907 | } |
1da177e4 | 5908 | |
145dd5f9 | 5909 | local_irq_disable(); |
e36fa2f7 | 5910 | rps_lock(sd); |
11ef7a89 | 5911 | if (skb_queue_empty(&sd->input_pkt_queue)) { |
eecfd7c4 ED |
5912 | /* |
5913 | * Inline a custom version of __napi_complete(). | |
5914 | * only current cpu owns and manipulates this napi, | |
11ef7a89 TH |
5915 | * and NAPI_STATE_SCHED is the only possible flag set |
5916 | * on backlog. | |
5917 | * We can use a plain write instead of clear_bit(), | |
eecfd7c4 ED |
5918 | * and we dont need an smp_mb() memory barrier. |
5919 | */ | |
eecfd7c4 | 5920 | napi->state = 0; |
145dd5f9 PA |
5921 | again = false; |
5922 | } else { | |
5923 | skb_queue_splice_tail_init(&sd->input_pkt_queue, | |
5924 | &sd->process_queue); | |
bea3348e | 5925 | } |
e36fa2f7 | 5926 | rps_unlock(sd); |
145dd5f9 | 5927 | local_irq_enable(); |
6e7676c1 | 5928 | } |
1da177e4 | 5929 | |
bea3348e SH |
5930 | return work; |
5931 | } | |
1da177e4 | 5932 | |
bea3348e SH |
5933 | /** |
5934 | * __napi_schedule - schedule for receive | |
c4ea43c5 | 5935 | * @n: entry to schedule |
bea3348e | 5936 | * |
bc9ad166 ED |
5937 | * The entry's receive function will be scheduled to run. |
5938 | * Consider using __napi_schedule_irqoff() if hard irqs are masked. | |
bea3348e | 5939 | */ |
b5606c2d | 5940 | void __napi_schedule(struct napi_struct *n) |
bea3348e SH |
5941 | { |
5942 | unsigned long flags; | |
1da177e4 | 5943 | |
bea3348e | 5944 | local_irq_save(flags); |
903ceff7 | 5945 | ____napi_schedule(this_cpu_ptr(&softnet_data), n); |
bea3348e | 5946 | local_irq_restore(flags); |
1da177e4 | 5947 | } |
bea3348e SH |
5948 | EXPORT_SYMBOL(__napi_schedule); |
5949 | ||
39e6c820 ED |
5950 | /** |
5951 | * napi_schedule_prep - check if napi can be scheduled | |
5952 | * @n: napi context | |
5953 | * | |
5954 | * Test if NAPI routine is already running, and if not mark | |
5955 | * it as running. This is used as a condition variable | |
5956 | * insure only one NAPI poll instance runs. We also make | |
5957 | * sure there is no pending NAPI disable. | |
5958 | */ | |
5959 | bool napi_schedule_prep(struct napi_struct *n) | |
5960 | { | |
5961 | unsigned long val, new; | |
5962 | ||
5963 | do { | |
5964 | val = READ_ONCE(n->state); | |
5965 | if (unlikely(val & NAPIF_STATE_DISABLE)) | |
5966 | return false; | |
5967 | new = val | NAPIF_STATE_SCHED; | |
5968 | ||
5969 | /* Sets STATE_MISSED bit if STATE_SCHED was already set | |
5970 | * This was suggested by Alexander Duyck, as compiler | |
5971 | * emits better code than : | |
5972 | * if (val & NAPIF_STATE_SCHED) | |
5973 | * new |= NAPIF_STATE_MISSED; | |
5974 | */ | |
5975 | new |= (val & NAPIF_STATE_SCHED) / NAPIF_STATE_SCHED * | |
5976 | NAPIF_STATE_MISSED; | |
5977 | } while (cmpxchg(&n->state, val, new) != val); | |
5978 | ||
5979 | return !(val & NAPIF_STATE_SCHED); | |
5980 | } | |
5981 | EXPORT_SYMBOL(napi_schedule_prep); | |
5982 | ||
bc9ad166 ED |
5983 | /** |
5984 | * __napi_schedule_irqoff - schedule for receive | |
5985 | * @n: entry to schedule | |
5986 | * | |
eba89455 SAS |
5987 | * Variant of __napi_schedule() assuming hard irqs are masked. |
5988 | * | |
5989 | * On PREEMPT_RT enabled kernels this maps to __napi_schedule() | |
5990 | * because the interrupt disabled assumption might not be true | |
5991 | * due to force-threaded interrupts and spinlock substitution. | |
bc9ad166 ED |
5992 | */ |
5993 | void __napi_schedule_irqoff(struct napi_struct *n) | |
5994 | { | |
eba89455 SAS |
5995 | if (!IS_ENABLED(CONFIG_PREEMPT_RT)) |
5996 | ____napi_schedule(this_cpu_ptr(&softnet_data), n); | |
5997 | else | |
5998 | __napi_schedule(n); | |
bc9ad166 ED |
5999 | } |
6000 | EXPORT_SYMBOL(__napi_schedule_irqoff); | |
6001 | ||
364b6055 | 6002 | bool napi_complete_done(struct napi_struct *n, int work_done) |
d565b0a1 | 6003 | { |
39e6c820 | 6004 | unsigned long flags, val, new; |
d565b0a1 HX |
6005 | |
6006 | /* | |
217f6974 ED |
6007 | * 1) Don't let napi dequeue from the cpu poll list |
6008 | * just in case its running on a different cpu. | |
6009 | * 2) If we are busy polling, do nothing here, we have | |
6010 | * the guarantee we will be called later. | |
d565b0a1 | 6011 | */ |
217f6974 ED |
6012 | if (unlikely(n->state & (NAPIF_STATE_NPSVC | |
6013 | NAPIF_STATE_IN_BUSY_POLL))) | |
364b6055 | 6014 | return false; |
d565b0a1 | 6015 | |
d9f37d01 | 6016 | if (n->gro_bitmask) { |
3b47d303 | 6017 | unsigned long timeout = 0; |
d75b1ade | 6018 | |
3b47d303 ED |
6019 | if (work_done) |
6020 | timeout = n->dev->gro_flush_timeout; | |
6021 | ||
605108ac PA |
6022 | /* When the NAPI instance uses a timeout and keeps postponing |
6023 | * it, we need to bound somehow the time packets are kept in | |
6024 | * the GRO layer | |
6025 | */ | |
6026 | napi_gro_flush(n, !!timeout); | |
3b47d303 ED |
6027 | if (timeout) |
6028 | hrtimer_start(&n->timer, ns_to_ktime(timeout), | |
6029 | HRTIMER_MODE_REL_PINNED); | |
3b47d303 | 6030 | } |
8c33c6ce MM |
6031 | |
6032 | gro_normal_list(n); | |
6033 | ||
02c1602e | 6034 | if (unlikely(!list_empty(&n->poll_list))) { |
d75b1ade ED |
6035 | /* If n->poll_list is not empty, we need to mask irqs */ |
6036 | local_irq_save(flags); | |
02c1602e | 6037 | list_del_init(&n->poll_list); |
d75b1ade ED |
6038 | local_irq_restore(flags); |
6039 | } | |
39e6c820 ED |
6040 | |
6041 | do { | |
6042 | val = READ_ONCE(n->state); | |
6043 | ||
6044 | WARN_ON_ONCE(!(val & NAPIF_STATE_SCHED)); | |
6045 | ||
6046 | new = val & ~(NAPIF_STATE_MISSED | NAPIF_STATE_SCHED); | |
6047 | ||
6048 | /* If STATE_MISSED was set, leave STATE_SCHED set, | |
6049 | * because we will call napi->poll() one more time. | |
6050 | * This C code was suggested by Alexander Duyck to help gcc. | |
6051 | */ | |
6052 | new |= (val & NAPIF_STATE_MISSED) / NAPIF_STATE_MISSED * | |
6053 | NAPIF_STATE_SCHED; | |
6054 | } while (cmpxchg(&n->state, val, new) != val); | |
6055 | ||
6056 | if (unlikely(val & NAPIF_STATE_MISSED)) { | |
6057 | __napi_schedule(n); | |
6058 | return false; | |
6059 | } | |
6060 | ||
364b6055 | 6061 | return true; |
d565b0a1 | 6062 | } |
3b47d303 | 6063 | EXPORT_SYMBOL(napi_complete_done); |
d565b0a1 | 6064 | |
af12fa6e | 6065 | /* must be called under rcu_read_lock(), as we dont take a reference */ |
02d62e86 | 6066 | static struct napi_struct *napi_by_id(unsigned int napi_id) |
af12fa6e ET |
6067 | { |
6068 | unsigned int hash = napi_id % HASH_SIZE(napi_hash); | |
6069 | struct napi_struct *napi; | |
6070 | ||
6071 | hlist_for_each_entry_rcu(napi, &napi_hash[hash], napi_hash_node) | |
6072 | if (napi->napi_id == napi_id) | |
6073 | return napi; | |
6074 | ||
6075 | return NULL; | |
6076 | } | |
02d62e86 ED |
6077 | |
6078 | #if defined(CONFIG_NET_RX_BUSY_POLL) | |
217f6974 | 6079 | |
ce6aea93 | 6080 | #define BUSY_POLL_BUDGET 8 |
217f6974 ED |
6081 | |
6082 | static void busy_poll_stop(struct napi_struct *napi, void *have_poll_lock) | |
6083 | { | |
6084 | int rc; | |
6085 | ||
39e6c820 ED |
6086 | /* Busy polling means there is a high chance device driver hard irq |
6087 | * could not grab NAPI_STATE_SCHED, and that NAPI_STATE_MISSED was | |
6088 | * set in napi_schedule_prep(). | |
6089 | * Since we are about to call napi->poll() once more, we can safely | |
6090 | * clear NAPI_STATE_MISSED. | |
6091 | * | |
6092 | * Note: x86 could use a single "lock and ..." instruction | |
6093 | * to perform these two clear_bit() | |
6094 | */ | |
6095 | clear_bit(NAPI_STATE_MISSED, &napi->state); | |
217f6974 ED |
6096 | clear_bit(NAPI_STATE_IN_BUSY_POLL, &napi->state); |
6097 | ||
6098 | local_bh_disable(); | |
6099 | ||
6100 | /* All we really want here is to re-enable device interrupts. | |
6101 | * Ideally, a new ndo_busy_poll_stop() could avoid another round. | |
6102 | */ | |
6103 | rc = napi->poll(napi, BUSY_POLL_BUDGET); | |
323ebb61 EC |
6104 | /* We can't gro_normal_list() here, because napi->poll() might have |
6105 | * rearmed the napi (napi_complete_done()) in which case it could | |
6106 | * already be running on another CPU. | |
6107 | */ | |
1e22391e | 6108 | trace_napi_poll(napi, rc, BUSY_POLL_BUDGET); |
217f6974 | 6109 | netpoll_poll_unlock(have_poll_lock); |
323ebb61 EC |
6110 | if (rc == BUSY_POLL_BUDGET) { |
6111 | /* As the whole budget was spent, we still own the napi so can | |
6112 | * safely handle the rx_list. | |
6113 | */ | |
6114 | gro_normal_list(napi); | |
217f6974 | 6115 | __napi_schedule(napi); |
323ebb61 | 6116 | } |
217f6974 | 6117 | local_bh_enable(); |
217f6974 ED |
6118 | } |
6119 | ||
7db6b048 SS |
6120 | void napi_busy_loop(unsigned int napi_id, |
6121 | bool (*loop_end)(void *, unsigned long), | |
6122 | void *loop_end_arg) | |
02d62e86 | 6123 | { |
7db6b048 | 6124 | unsigned long start_time = loop_end ? busy_loop_current_time() : 0; |
217f6974 | 6125 | int (*napi_poll)(struct napi_struct *napi, int budget); |
217f6974 | 6126 | void *have_poll_lock = NULL; |
02d62e86 | 6127 | struct napi_struct *napi; |
217f6974 ED |
6128 | |
6129 | restart: | |
217f6974 | 6130 | napi_poll = NULL; |
02d62e86 | 6131 | |
2a028ecb | 6132 | rcu_read_lock(); |
02d62e86 | 6133 | |
545cd5e5 | 6134 | napi = napi_by_id(napi_id); |
02d62e86 ED |
6135 | if (!napi) |
6136 | goto out; | |
6137 | ||
217f6974 ED |
6138 | preempt_disable(); |
6139 | for (;;) { | |
2b5cd0df AD |
6140 | int work = 0; |
6141 | ||
2a028ecb | 6142 | local_bh_disable(); |
217f6974 ED |
6143 | if (!napi_poll) { |
6144 | unsigned long val = READ_ONCE(napi->state); | |
6145 | ||
6146 | /* If multiple threads are competing for this napi, | |
6147 | * we avoid dirtying napi->state as much as we can. | |
6148 | */ | |
6149 | if (val & (NAPIF_STATE_DISABLE | NAPIF_STATE_SCHED | | |
6150 | NAPIF_STATE_IN_BUSY_POLL)) | |
6151 | goto count; | |
6152 | if (cmpxchg(&napi->state, val, | |
6153 | val | NAPIF_STATE_IN_BUSY_POLL | | |
6154 | NAPIF_STATE_SCHED) != val) | |
6155 | goto count; | |
6156 | have_poll_lock = netpoll_poll_lock(napi); | |
6157 | napi_poll = napi->poll; | |
6158 | } | |
2b5cd0df AD |
6159 | work = napi_poll(napi, BUSY_POLL_BUDGET); |
6160 | trace_napi_poll(napi, work, BUSY_POLL_BUDGET); | |
323ebb61 | 6161 | gro_normal_list(napi); |
217f6974 | 6162 | count: |
2b5cd0df | 6163 | if (work > 0) |
7db6b048 | 6164 | __NET_ADD_STATS(dev_net(napi->dev), |
2b5cd0df | 6165 | LINUX_MIB_BUSYPOLLRXPACKETS, work); |
2a028ecb | 6166 | local_bh_enable(); |
02d62e86 | 6167 | |
7db6b048 | 6168 | if (!loop_end || loop_end(loop_end_arg, start_time)) |
217f6974 | 6169 | break; |
02d62e86 | 6170 | |
217f6974 ED |
6171 | if (unlikely(need_resched())) { |
6172 | if (napi_poll) | |
6173 | busy_poll_stop(napi, have_poll_lock); | |
6174 | preempt_enable(); | |
6175 | rcu_read_unlock(); | |
6176 | cond_resched(); | |
7db6b048 | 6177 | if (loop_end(loop_end_arg, start_time)) |
2b5cd0df | 6178 | return; |
217f6974 ED |
6179 | goto restart; |
6180 | } | |
6cdf89b1 | 6181 | cpu_relax(); |
217f6974 ED |
6182 | } |
6183 | if (napi_poll) | |
6184 | busy_poll_stop(napi, have_poll_lock); | |
6185 | preempt_enable(); | |
02d62e86 | 6186 | out: |
2a028ecb | 6187 | rcu_read_unlock(); |
02d62e86 | 6188 | } |
7db6b048 | 6189 | EXPORT_SYMBOL(napi_busy_loop); |
02d62e86 ED |
6190 | |
6191 | #endif /* CONFIG_NET_RX_BUSY_POLL */ | |
af12fa6e | 6192 | |
149d6ad8 | 6193 | static void napi_hash_add(struct napi_struct *napi) |
af12fa6e | 6194 | { |
d64b5e85 ED |
6195 | if (test_bit(NAPI_STATE_NO_BUSY_POLL, &napi->state) || |
6196 | test_and_set_bit(NAPI_STATE_HASHED, &napi->state)) | |
52bd2d62 | 6197 | return; |
af12fa6e | 6198 | |
52bd2d62 | 6199 | spin_lock(&napi_hash_lock); |
af12fa6e | 6200 | |
545cd5e5 | 6201 | /* 0..NR_CPUS range is reserved for sender_cpu use */ |
52bd2d62 | 6202 | do { |
545cd5e5 AD |
6203 | if (unlikely(++napi_gen_id < MIN_NAPI_ID)) |
6204 | napi_gen_id = MIN_NAPI_ID; | |
52bd2d62 ED |
6205 | } while (napi_by_id(napi_gen_id)); |
6206 | napi->napi_id = napi_gen_id; | |
af12fa6e | 6207 | |
52bd2d62 ED |
6208 | hlist_add_head_rcu(&napi->napi_hash_node, |
6209 | &napi_hash[napi->napi_id % HASH_SIZE(napi_hash)]); | |
af12fa6e | 6210 | |
52bd2d62 | 6211 | spin_unlock(&napi_hash_lock); |
af12fa6e | 6212 | } |
af12fa6e ET |
6213 | |
6214 | /* Warning : caller is responsible to make sure rcu grace period | |
6215 | * is respected before freeing memory containing @napi | |
6216 | */ | |
34cbe27e | 6217 | bool napi_hash_del(struct napi_struct *napi) |
af12fa6e | 6218 | { |
34cbe27e ED |
6219 | bool rcu_sync_needed = false; |
6220 | ||
af12fa6e ET |
6221 | spin_lock(&napi_hash_lock); |
6222 | ||
34cbe27e ED |
6223 | if (test_and_clear_bit(NAPI_STATE_HASHED, &napi->state)) { |
6224 | rcu_sync_needed = true; | |
af12fa6e | 6225 | hlist_del_rcu(&napi->napi_hash_node); |
34cbe27e | 6226 | } |
af12fa6e | 6227 | spin_unlock(&napi_hash_lock); |
34cbe27e | 6228 | return rcu_sync_needed; |
af12fa6e ET |
6229 | } |
6230 | EXPORT_SYMBOL_GPL(napi_hash_del); | |
6231 | ||
3b47d303 ED |
6232 | static enum hrtimer_restart napi_watchdog(struct hrtimer *timer) |
6233 | { | |
6234 | struct napi_struct *napi; | |
6235 | ||
6236 | napi = container_of(timer, struct napi_struct, timer); | |
39e6c820 ED |
6237 | |
6238 | /* Note : we use a relaxed variant of napi_schedule_prep() not setting | |
6239 | * NAPI_STATE_MISSED, since we do not react to a device IRQ. | |
6240 | */ | |
d9f37d01 | 6241 | if (napi->gro_bitmask && !napi_disable_pending(napi) && |
39e6c820 ED |
6242 | !test_and_set_bit(NAPI_STATE_SCHED, &napi->state)) |
6243 | __napi_schedule_irqoff(napi); | |
3b47d303 ED |
6244 | |
6245 | return HRTIMER_NORESTART; | |
6246 | } | |
6247 | ||
7c4ec749 | 6248 | static void init_gro_hash(struct napi_struct *napi) |
d565b0a1 | 6249 | { |
07d78363 DM |
6250 | int i; |
6251 | ||
6312fe77 LR |
6252 | for (i = 0; i < GRO_HASH_BUCKETS; i++) { |
6253 | INIT_LIST_HEAD(&napi->gro_hash[i].list); | |
6254 | napi->gro_hash[i].count = 0; | |
6255 | } | |
7c4ec749 DM |
6256 | napi->gro_bitmask = 0; |
6257 | } | |
6258 | ||
6259 | void netif_napi_add(struct net_device *dev, struct napi_struct *napi, | |
6260 | int (*poll)(struct napi_struct *, int), int weight) | |
6261 | { | |
6262 | INIT_LIST_HEAD(&napi->poll_list); | |
6263 | hrtimer_init(&napi->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_PINNED); | |
6264 | napi->timer.function = napi_watchdog; | |
6265 | init_gro_hash(napi); | |
5d38a079 | 6266 | napi->skb = NULL; |
323ebb61 EC |
6267 | INIT_LIST_HEAD(&napi->rx_list); |
6268 | napi->rx_count = 0; | |
d565b0a1 | 6269 | napi->poll = poll; |
82dc3c63 | 6270 | if (weight > NAPI_POLL_WEIGHT) |
bf29e9e9 QC |
6271 | netdev_err_once(dev, "%s() called with weight %d\n", __func__, |
6272 | weight); | |
d565b0a1 | 6273 | napi->weight = weight; |
d565b0a1 | 6274 | napi->dev = dev; |
5d38a079 | 6275 | #ifdef CONFIG_NETPOLL |
d565b0a1 HX |
6276 | napi->poll_owner = -1; |
6277 | #endif | |
6278 | set_bit(NAPI_STATE_SCHED, &napi->state); | |
98f0fb71 JK |
6279 | set_bit(NAPI_STATE_NPSVC, &napi->state); |
6280 | list_add_rcu(&napi->dev_list, &dev->napi_list); | |
93d05d4a | 6281 | napi_hash_add(napi); |
d565b0a1 HX |
6282 | } |
6283 | EXPORT_SYMBOL(netif_napi_add); | |
6284 | ||
3b47d303 ED |
6285 | void napi_disable(struct napi_struct *n) |
6286 | { | |
6287 | might_sleep(); | |
6288 | set_bit(NAPI_STATE_DISABLE, &n->state); | |
6289 | ||
6290 | while (test_and_set_bit(NAPI_STATE_SCHED, &n->state)) | |
6291 | msleep(1); | |
2d8bff12 NH |
6292 | while (test_and_set_bit(NAPI_STATE_NPSVC, &n->state)) |
6293 | msleep(1); | |
3b47d303 ED |
6294 | |
6295 | hrtimer_cancel(&n->timer); | |
6296 | ||
6297 | clear_bit(NAPI_STATE_DISABLE, &n->state); | |
6298 | } | |
6299 | EXPORT_SYMBOL(napi_disable); | |
6300 | ||
07d78363 | 6301 | static void flush_gro_hash(struct napi_struct *napi) |
d4546c25 | 6302 | { |
07d78363 | 6303 | int i; |
d4546c25 | 6304 | |
07d78363 DM |
6305 | for (i = 0; i < GRO_HASH_BUCKETS; i++) { |
6306 | struct sk_buff *skb, *n; | |
6307 | ||
6312fe77 | 6308 | list_for_each_entry_safe(skb, n, &napi->gro_hash[i].list, list) |
07d78363 | 6309 | kfree_skb(skb); |
6312fe77 | 6310 | napi->gro_hash[i].count = 0; |
07d78363 | 6311 | } |
d4546c25 DM |
6312 | } |
6313 | ||
93d05d4a | 6314 | /* Must be called in process context */ |
d565b0a1 HX |
6315 | void netif_napi_del(struct napi_struct *napi) |
6316 | { | |
93d05d4a ED |
6317 | might_sleep(); |
6318 | if (napi_hash_del(napi)) | |
6319 | synchronize_net(); | |
d7b06636 | 6320 | list_del_init(&napi->dev_list); |
76620aaf | 6321 | napi_free_frags(napi); |
d565b0a1 | 6322 | |
07d78363 | 6323 | flush_gro_hash(napi); |
d9f37d01 | 6324 | napi->gro_bitmask = 0; |
d565b0a1 HX |
6325 | } |
6326 | EXPORT_SYMBOL(netif_napi_del); | |
6327 | ||
726ce70e HX |
6328 | static int napi_poll(struct napi_struct *n, struct list_head *repoll) |
6329 | { | |
6330 | void *have; | |
6331 | int work, weight; | |
6332 | ||
6333 | list_del_init(&n->poll_list); | |
6334 | ||
6335 | have = netpoll_poll_lock(n); | |
6336 | ||
6337 | weight = n->weight; | |
6338 | ||
6339 | /* This NAPI_STATE_SCHED test is for avoiding a race | |
6340 | * with netpoll's poll_napi(). Only the entity which | |
6341 | * obtains the lock and sees NAPI_STATE_SCHED set will | |
6342 | * actually make the ->poll() call. Therefore we avoid | |
6343 | * accidentally calling ->poll() when NAPI is not scheduled. | |
6344 | */ | |
6345 | work = 0; | |
6346 | if (test_bit(NAPI_STATE_SCHED, &n->state)) { | |
6347 | work = n->poll(n, weight); | |
1db19db7 | 6348 | trace_napi_poll(n, work, weight); |
726ce70e HX |
6349 | } |
6350 | ||
061fe690 ED |
6351 | if (unlikely(work > weight)) |
6352 | pr_err_once("NAPI poll function %pS returned %d, exceeding its budget of %d.\n", | |
6353 | n->poll, work, weight); | |
726ce70e HX |
6354 | |
6355 | if (likely(work < weight)) | |
6356 | goto out_unlock; | |
6357 | ||
6358 | /* Drivers must not modify the NAPI state if they | |
6359 | * consume the entire weight. In such cases this code | |
6360 | * still "owns" the NAPI instance and therefore can | |
6361 | * move the instance around on the list at-will. | |
6362 | */ | |
6363 | if (unlikely(napi_disable_pending(n))) { | |
6364 | napi_complete(n); | |
6365 | goto out_unlock; | |
6366 | } | |
6367 | ||
d9f37d01 | 6368 | if (n->gro_bitmask) { |
726ce70e HX |
6369 | /* flush too old packets |
6370 | * If HZ < 1000, flush all packets. | |
6371 | */ | |
6372 | napi_gro_flush(n, HZ >= 1000); | |
6373 | } | |
6374 | ||
8c33c6ce MM |
6375 | gro_normal_list(n); |
6376 | ||
001ce546 HX |
6377 | /* Some drivers may have called napi_schedule |
6378 | * prior to exhausting their budget. | |
6379 | */ | |
6380 | if (unlikely(!list_empty(&n->poll_list))) { | |
6381 | pr_warn_once("%s: Budget exhausted after napi rescheduled\n", | |
6382 | n->dev ? n->dev->name : "backlog"); | |
6383 | goto out_unlock; | |
6384 | } | |
6385 | ||
726ce70e HX |
6386 | list_add_tail(&n->poll_list, repoll); |
6387 | ||
6388 | out_unlock: | |
6389 | netpoll_poll_unlock(have); | |
6390 | ||
6391 | return work; | |
6392 | } | |
6393 | ||
0766f788 | 6394 | static __latent_entropy void net_rx_action(struct softirq_action *h) |
1da177e4 | 6395 | { |
903ceff7 | 6396 | struct softnet_data *sd = this_cpu_ptr(&softnet_data); |
7acf8a1e MW |
6397 | unsigned long time_limit = jiffies + |
6398 | usecs_to_jiffies(netdev_budget_usecs); | |
51b0bded | 6399 | int budget = netdev_budget; |
d75b1ade ED |
6400 | LIST_HEAD(list); |
6401 | LIST_HEAD(repoll); | |
53fb95d3 | 6402 | |
1da177e4 | 6403 | local_irq_disable(); |
d75b1ade ED |
6404 | list_splice_init(&sd->poll_list, &list); |
6405 | local_irq_enable(); | |
1da177e4 | 6406 | |
ceb8d5bf | 6407 | for (;;) { |
bea3348e | 6408 | struct napi_struct *n; |
1da177e4 | 6409 | |
ceb8d5bf HX |
6410 | if (list_empty(&list)) { |
6411 | if (!sd_has_rps_ipi_waiting(sd) && list_empty(&repoll)) | |
f52dffe0 | 6412 | goto out; |
ceb8d5bf HX |
6413 | break; |
6414 | } | |
6415 | ||
6bd373eb HX |
6416 | n = list_first_entry(&list, struct napi_struct, poll_list); |
6417 | budget -= napi_poll(n, &repoll); | |
6418 | ||
d75b1ade | 6419 | /* If softirq window is exhausted then punt. |
24f8b238 SH |
6420 | * Allow this to run for 2 jiffies since which will allow |
6421 | * an average latency of 1.5/HZ. | |
bea3348e | 6422 | */ |
ceb8d5bf HX |
6423 | if (unlikely(budget <= 0 || |
6424 | time_after_eq(jiffies, time_limit))) { | |
6425 | sd->time_squeeze++; | |
6426 | break; | |
6427 | } | |
1da177e4 | 6428 | } |
d75b1ade | 6429 | |
d75b1ade ED |
6430 | local_irq_disable(); |
6431 | ||
6432 | list_splice_tail_init(&sd->poll_list, &list); | |
6433 | list_splice_tail(&repoll, &list); | |
6434 | list_splice(&list, &sd->poll_list); | |
6435 | if (!list_empty(&sd->poll_list)) | |
6436 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); | |
6437 | ||
e326bed2 | 6438 | net_rps_action_and_irq_enable(sd); |
f52dffe0 ED |
6439 | out: |
6440 | __kfree_skb_flush(); | |
1da177e4 LT |
6441 | } |
6442 | ||
aa9d8560 | 6443 | struct netdev_adjacent { |
9ff162a8 | 6444 | struct net_device *dev; |
5d261913 VF |
6445 | |
6446 | /* upper master flag, there can only be one master device per list */ | |
9ff162a8 | 6447 | bool master; |
5d261913 | 6448 | |
32b6d34f TY |
6449 | /* lookup ignore flag */ |
6450 | bool ignore; | |
6451 | ||
5d261913 VF |
6452 | /* counter for the number of times this device was added to us */ |
6453 | u16 ref_nr; | |
6454 | ||
402dae96 VF |
6455 | /* private field for the users */ |
6456 | void *private; | |
6457 | ||
9ff162a8 JP |
6458 | struct list_head list; |
6459 | struct rcu_head rcu; | |
9ff162a8 JP |
6460 | }; |
6461 | ||
6ea29da1 | 6462 | static struct netdev_adjacent *__netdev_find_adj(struct net_device *adj_dev, |
2f268f12 | 6463 | struct list_head *adj_list) |
9ff162a8 | 6464 | { |
5d261913 | 6465 | struct netdev_adjacent *adj; |
5d261913 | 6466 | |
2f268f12 | 6467 | list_for_each_entry(adj, adj_list, list) { |
5d261913 VF |
6468 | if (adj->dev == adj_dev) |
6469 | return adj; | |
9ff162a8 JP |
6470 | } |
6471 | return NULL; | |
6472 | } | |
6473 | ||
32b6d34f | 6474 | static int ____netdev_has_upper_dev(struct net_device *upper_dev, void *data) |
f1170fd4 DA |
6475 | { |
6476 | struct net_device *dev = data; | |
6477 | ||
6478 | return upper_dev == dev; | |
6479 | } | |
6480 | ||
9ff162a8 JP |
6481 | /** |
6482 | * netdev_has_upper_dev - Check if device is linked to an upper device | |
6483 | * @dev: device | |
6484 | * @upper_dev: upper device to check | |
6485 | * | |
6486 | * Find out if a device is linked to specified upper device and return true | |
6487 | * in case it is. Note that this checks only immediate upper device, | |
6488 | * not through a complete stack of devices. The caller must hold the RTNL lock. | |
6489 | */ | |
6490 | bool netdev_has_upper_dev(struct net_device *dev, | |
6491 | struct net_device *upper_dev) | |
6492 | { | |
6493 | ASSERT_RTNL(); | |
6494 | ||
32b6d34f | 6495 | return netdev_walk_all_upper_dev_rcu(dev, ____netdev_has_upper_dev, |
f1170fd4 | 6496 | upper_dev); |
9ff162a8 JP |
6497 | } |
6498 | EXPORT_SYMBOL(netdev_has_upper_dev); | |
6499 | ||
1a3f060c DA |
6500 | /** |
6501 | * netdev_has_upper_dev_all - Check if device is linked to an upper device | |
6502 | * @dev: device | |
6503 | * @upper_dev: upper device to check | |
6504 | * | |
6505 | * Find out if a device is linked to specified upper device and return true | |
6506 | * in case it is. Note that this checks the entire upper device chain. | |
6507 | * The caller must hold rcu lock. | |
6508 | */ | |
6509 | ||
1a3f060c DA |
6510 | bool netdev_has_upper_dev_all_rcu(struct net_device *dev, |
6511 | struct net_device *upper_dev) | |
6512 | { | |
32b6d34f | 6513 | return !!netdev_walk_all_upper_dev_rcu(dev, ____netdev_has_upper_dev, |
1a3f060c DA |
6514 | upper_dev); |
6515 | } | |
6516 | EXPORT_SYMBOL(netdev_has_upper_dev_all_rcu); | |
6517 | ||
9ff162a8 JP |
6518 | /** |
6519 | * netdev_has_any_upper_dev - Check if device is linked to some device | |
6520 | * @dev: device | |
6521 | * | |
6522 | * Find out if a device is linked to an upper device and return true in case | |
6523 | * it is. The caller must hold the RTNL lock. | |
6524 | */ | |
25cc72a3 | 6525 | bool netdev_has_any_upper_dev(struct net_device *dev) |
9ff162a8 JP |
6526 | { |
6527 | ASSERT_RTNL(); | |
6528 | ||
f1170fd4 | 6529 | return !list_empty(&dev->adj_list.upper); |
9ff162a8 | 6530 | } |
25cc72a3 | 6531 | EXPORT_SYMBOL(netdev_has_any_upper_dev); |
9ff162a8 JP |
6532 | |
6533 | /** | |
6534 | * netdev_master_upper_dev_get - Get master upper device | |
6535 | * @dev: device | |
6536 | * | |
6537 | * Find a master upper device and return pointer to it or NULL in case | |
6538 | * it's not there. The caller must hold the RTNL lock. | |
6539 | */ | |
6540 | struct net_device *netdev_master_upper_dev_get(struct net_device *dev) | |
6541 | { | |
aa9d8560 | 6542 | struct netdev_adjacent *upper; |
9ff162a8 JP |
6543 | |
6544 | ASSERT_RTNL(); | |
6545 | ||
2f268f12 | 6546 | if (list_empty(&dev->adj_list.upper)) |
9ff162a8 JP |
6547 | return NULL; |
6548 | ||
2f268f12 | 6549 | upper = list_first_entry(&dev->adj_list.upper, |
aa9d8560 | 6550 | struct netdev_adjacent, list); |
9ff162a8 JP |
6551 | if (likely(upper->master)) |
6552 | return upper->dev; | |
6553 | return NULL; | |
6554 | } | |
6555 | EXPORT_SYMBOL(netdev_master_upper_dev_get); | |
6556 | ||
32b6d34f TY |
6557 | static struct net_device *__netdev_master_upper_dev_get(struct net_device *dev) |
6558 | { | |
6559 | struct netdev_adjacent *upper; | |
6560 | ||
6561 | ASSERT_RTNL(); | |
6562 | ||
6563 | if (list_empty(&dev->adj_list.upper)) | |
6564 | return NULL; | |
6565 | ||
6566 | upper = list_first_entry(&dev->adj_list.upper, | |
6567 | struct netdev_adjacent, list); | |
6568 | if (likely(upper->master) && !upper->ignore) | |
6569 | return upper->dev; | |
6570 | return NULL; | |
6571 | } | |
6572 | ||
0f524a80 DA |
6573 | /** |
6574 | * netdev_has_any_lower_dev - Check if device is linked to some device | |
6575 | * @dev: device | |
6576 | * | |
6577 | * Find out if a device is linked to a lower device and return true in case | |
6578 | * it is. The caller must hold the RTNL lock. | |
6579 | */ | |
6580 | static bool netdev_has_any_lower_dev(struct net_device *dev) | |
6581 | { | |
6582 | ASSERT_RTNL(); | |
6583 | ||
6584 | return !list_empty(&dev->adj_list.lower); | |
6585 | } | |
6586 | ||
b6ccba4c VF |
6587 | void *netdev_adjacent_get_private(struct list_head *adj_list) |
6588 | { | |
6589 | struct netdev_adjacent *adj; | |
6590 | ||
6591 | adj = list_entry(adj_list, struct netdev_adjacent, list); | |
6592 | ||
6593 | return adj->private; | |
6594 | } | |
6595 | EXPORT_SYMBOL(netdev_adjacent_get_private); | |
6596 | ||
44a40855 VY |
6597 | /** |
6598 | * netdev_upper_get_next_dev_rcu - Get the next dev from upper list | |
6599 | * @dev: device | |
6600 | * @iter: list_head ** of the current position | |
6601 | * | |
6602 | * Gets the next device from the dev's upper list, starting from iter | |
6603 | * position. The caller must hold RCU read lock. | |
6604 | */ | |
6605 | struct net_device *netdev_upper_get_next_dev_rcu(struct net_device *dev, | |
6606 | struct list_head **iter) | |
6607 | { | |
6608 | struct netdev_adjacent *upper; | |
6609 | ||
6610 | WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held()); | |
6611 | ||
6612 | upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); | |
6613 | ||
6614 | if (&upper->list == &dev->adj_list.upper) | |
6615 | return NULL; | |
6616 | ||
6617 | *iter = &upper->list; | |
6618 | ||
6619 | return upper->dev; | |
6620 | } | |
6621 | EXPORT_SYMBOL(netdev_upper_get_next_dev_rcu); | |
6622 | ||
32b6d34f TY |
6623 | static struct net_device *__netdev_next_upper_dev(struct net_device *dev, |
6624 | struct list_head **iter, | |
6625 | bool *ignore) | |
5343da4c TY |
6626 | { |
6627 | struct netdev_adjacent *upper; | |
6628 | ||
6629 | upper = list_entry((*iter)->next, struct netdev_adjacent, list); | |
6630 | ||
6631 | if (&upper->list == &dev->adj_list.upper) | |
6632 | return NULL; | |
6633 | ||
6634 | *iter = &upper->list; | |
32b6d34f | 6635 | *ignore = upper->ignore; |
5343da4c TY |
6636 | |
6637 | return upper->dev; | |
6638 | } | |
6639 | ||
1a3f060c DA |
6640 | static struct net_device *netdev_next_upper_dev_rcu(struct net_device *dev, |
6641 | struct list_head **iter) | |
6642 | { | |
6643 | struct netdev_adjacent *upper; | |
6644 | ||
6645 | WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held()); | |
6646 | ||
6647 | upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); | |
6648 | ||
6649 | if (&upper->list == &dev->adj_list.upper) | |
6650 | return NULL; | |
6651 | ||
6652 | *iter = &upper->list; | |
6653 | ||
6654 | return upper->dev; | |
6655 | } | |
6656 | ||
32b6d34f TY |
6657 | static int __netdev_walk_all_upper_dev(struct net_device *dev, |
6658 | int (*fn)(struct net_device *dev, | |
6659 | void *data), | |
6660 | void *data) | |
5343da4c TY |
6661 | { |
6662 | struct net_device *udev, *next, *now, *dev_stack[MAX_NEST_DEV + 1]; | |
6663 | struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1]; | |
6664 | int ret, cur = 0; | |
32b6d34f | 6665 | bool ignore; |
5343da4c TY |
6666 | |
6667 | now = dev; | |
6668 | iter = &dev->adj_list.upper; | |
6669 | ||
6670 | while (1) { | |
6671 | if (now != dev) { | |
6672 | ret = fn(now, data); | |
6673 | if (ret) | |
6674 | return ret; | |
6675 | } | |
6676 | ||
6677 | next = NULL; | |
6678 | while (1) { | |
32b6d34f | 6679 | udev = __netdev_next_upper_dev(now, &iter, &ignore); |
5343da4c TY |
6680 | if (!udev) |
6681 | break; | |
32b6d34f TY |
6682 | if (ignore) |
6683 | continue; | |
5343da4c TY |
6684 | |
6685 | next = udev; | |
6686 | niter = &udev->adj_list.upper; | |
6687 | dev_stack[cur] = now; | |
6688 | iter_stack[cur++] = iter; | |
6689 | break; | |
6690 | } | |
6691 | ||
6692 | if (!next) { | |
6693 | if (!cur) | |
6694 | return 0; | |
6695 | next = dev_stack[--cur]; | |
6696 | niter = iter_stack[cur]; | |
6697 | } | |
6698 | ||
6699 | now = next; | |
6700 | iter = niter; | |
6701 | } | |
6702 | ||
6703 | return 0; | |
6704 | } | |
6705 | ||
1a3f060c DA |
6706 | int netdev_walk_all_upper_dev_rcu(struct net_device *dev, |
6707 | int (*fn)(struct net_device *dev, | |
6708 | void *data), | |
6709 | void *data) | |
6710 | { | |
5343da4c TY |
6711 | struct net_device *udev, *next, *now, *dev_stack[MAX_NEST_DEV + 1]; |
6712 | struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1]; | |
6713 | int ret, cur = 0; | |
1a3f060c | 6714 | |
5343da4c TY |
6715 | now = dev; |
6716 | iter = &dev->adj_list.upper; | |
1a3f060c | 6717 | |
5343da4c TY |
6718 | while (1) { |
6719 | if (now != dev) { | |
6720 | ret = fn(now, data); | |
6721 | if (ret) | |
6722 | return ret; | |
6723 | } | |
6724 | ||
6725 | next = NULL; | |
6726 | while (1) { | |
6727 | udev = netdev_next_upper_dev_rcu(now, &iter); | |
6728 | if (!udev) | |
6729 | break; | |
6730 | ||
6731 | next = udev; | |
6732 | niter = &udev->adj_list.upper; | |
6733 | dev_stack[cur] = now; | |
6734 | iter_stack[cur++] = iter; | |
6735 | break; | |
6736 | } | |
6737 | ||
6738 | if (!next) { | |
6739 | if (!cur) | |
6740 | return 0; | |
6741 | next = dev_stack[--cur]; | |
6742 | niter = iter_stack[cur]; | |
6743 | } | |
6744 | ||
6745 | now = next; | |
6746 | iter = niter; | |
1a3f060c DA |
6747 | } |
6748 | ||
6749 | return 0; | |
6750 | } | |
6751 | EXPORT_SYMBOL_GPL(netdev_walk_all_upper_dev_rcu); | |
6752 | ||
32b6d34f TY |
6753 | static bool __netdev_has_upper_dev(struct net_device *dev, |
6754 | struct net_device *upper_dev) | |
6755 | { | |
6756 | ASSERT_RTNL(); | |
6757 | ||
6758 | return __netdev_walk_all_upper_dev(dev, ____netdev_has_upper_dev, | |
6759 | upper_dev); | |
6760 | } | |
6761 | ||
31088a11 VF |
6762 | /** |
6763 | * netdev_lower_get_next_private - Get the next ->private from the | |
6764 | * lower neighbour list | |
6765 | * @dev: device | |
6766 | * @iter: list_head ** of the current position | |
6767 | * | |
6768 | * Gets the next netdev_adjacent->private from the dev's lower neighbour | |
6769 | * list, starting from iter position. The caller must hold either hold the | |
6770 | * RTNL lock or its own locking that guarantees that the neighbour lower | |
b469139e | 6771 | * list will remain unchanged. |
31088a11 VF |
6772 | */ |
6773 | void *netdev_lower_get_next_private(struct net_device *dev, | |
6774 | struct list_head **iter) | |
6775 | { | |
6776 | struct netdev_adjacent *lower; | |
6777 | ||
6778 | lower = list_entry(*iter, struct netdev_adjacent, list); | |
6779 | ||
6780 | if (&lower->list == &dev->adj_list.lower) | |
6781 | return NULL; | |
6782 | ||
6859e7df | 6783 | *iter = lower->list.next; |
31088a11 VF |
6784 | |
6785 | return lower->private; | |
6786 | } | |
6787 | EXPORT_SYMBOL(netdev_lower_get_next_private); | |
6788 | ||
6789 | /** | |
6790 | * netdev_lower_get_next_private_rcu - Get the next ->private from the | |
6791 | * lower neighbour list, RCU | |
6792 | * variant | |
6793 | * @dev: device | |
6794 | * @iter: list_head ** of the current position | |
6795 | * | |
6796 | * Gets the next netdev_adjacent->private from the dev's lower neighbour | |
6797 | * list, starting from iter position. The caller must hold RCU read lock. | |
6798 | */ | |
6799 | void *netdev_lower_get_next_private_rcu(struct net_device *dev, | |
6800 | struct list_head **iter) | |
6801 | { | |
6802 | struct netdev_adjacent *lower; | |
6803 | ||
6804 | WARN_ON_ONCE(!rcu_read_lock_held()); | |
6805 | ||
6806 | lower = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); | |
6807 | ||
6808 | if (&lower->list == &dev->adj_list.lower) | |
6809 | return NULL; | |
6810 | ||
6859e7df | 6811 | *iter = &lower->list; |
31088a11 VF |
6812 | |
6813 | return lower->private; | |
6814 | } | |
6815 | EXPORT_SYMBOL(netdev_lower_get_next_private_rcu); | |
6816 | ||
4085ebe8 VY |
6817 | /** |
6818 | * netdev_lower_get_next - Get the next device from the lower neighbour | |
6819 | * list | |
6820 | * @dev: device | |
6821 | * @iter: list_head ** of the current position | |
6822 | * | |
6823 | * Gets the next netdev_adjacent from the dev's lower neighbour | |
6824 | * list, starting from iter position. The caller must hold RTNL lock or | |
6825 | * its own locking that guarantees that the neighbour lower | |
b469139e | 6826 | * list will remain unchanged. |
4085ebe8 VY |
6827 | */ |
6828 | void *netdev_lower_get_next(struct net_device *dev, struct list_head **iter) | |
6829 | { | |
6830 | struct netdev_adjacent *lower; | |
6831 | ||
cfdd28be | 6832 | lower = list_entry(*iter, struct netdev_adjacent, list); |
4085ebe8 VY |
6833 | |
6834 | if (&lower->list == &dev->adj_list.lower) | |
6835 | return NULL; | |
6836 | ||
cfdd28be | 6837 | *iter = lower->list.next; |
4085ebe8 VY |
6838 | |
6839 | return lower->dev; | |
6840 | } | |
6841 | EXPORT_SYMBOL(netdev_lower_get_next); | |
6842 | ||
1a3f060c DA |
6843 | static struct net_device *netdev_next_lower_dev(struct net_device *dev, |
6844 | struct list_head **iter) | |
6845 | { | |
6846 | struct netdev_adjacent *lower; | |
6847 | ||
46b5ab1a | 6848 | lower = list_entry((*iter)->next, struct netdev_adjacent, list); |
1a3f060c DA |
6849 | |
6850 | if (&lower->list == &dev->adj_list.lower) | |
6851 | return NULL; | |
6852 | ||
46b5ab1a | 6853 | *iter = &lower->list; |
1a3f060c DA |
6854 | |
6855 | return lower->dev; | |
6856 | } | |
6857 | ||
32b6d34f TY |
6858 | static struct net_device *__netdev_next_lower_dev(struct net_device *dev, |
6859 | struct list_head **iter, | |
6860 | bool *ignore) | |
6861 | { | |
6862 | struct netdev_adjacent *lower; | |
6863 | ||
6864 | lower = list_entry((*iter)->next, struct netdev_adjacent, list); | |
6865 | ||
6866 | if (&lower->list == &dev->adj_list.lower) | |
6867 | return NULL; | |
6868 | ||
6869 | *iter = &lower->list; | |
6870 | *ignore = lower->ignore; | |
6871 | ||
6872 | return lower->dev; | |
6873 | } | |
6874 | ||
1a3f060c DA |
6875 | int netdev_walk_all_lower_dev(struct net_device *dev, |
6876 | int (*fn)(struct net_device *dev, | |
6877 | void *data), | |
6878 | void *data) | |
6879 | { | |
5343da4c TY |
6880 | struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1]; |
6881 | struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1]; | |
6882 | int ret, cur = 0; | |
1a3f060c | 6883 | |
5343da4c TY |
6884 | now = dev; |
6885 | iter = &dev->adj_list.lower; | |
1a3f060c | 6886 | |
5343da4c TY |
6887 | while (1) { |
6888 | if (now != dev) { | |
6889 | ret = fn(now, data); | |
6890 | if (ret) | |
6891 | return ret; | |
6892 | } | |
6893 | ||
6894 | next = NULL; | |
6895 | while (1) { | |
6896 | ldev = netdev_next_lower_dev(now, &iter); | |
6897 | if (!ldev) | |
6898 | break; | |
6899 | ||
6900 | next = ldev; | |
6901 | niter = &ldev->adj_list.lower; | |
6902 | dev_stack[cur] = now; | |
6903 | iter_stack[cur++] = iter; | |
6904 | break; | |
6905 | } | |
6906 | ||
6907 | if (!next) { | |
6908 | if (!cur) | |
6909 | return 0; | |
6910 | next = dev_stack[--cur]; | |
6911 | niter = iter_stack[cur]; | |
6912 | } | |
6913 | ||
6914 | now = next; | |
6915 | iter = niter; | |
1a3f060c DA |
6916 | } |
6917 | ||
6918 | return 0; | |
6919 | } | |
6920 | EXPORT_SYMBOL_GPL(netdev_walk_all_lower_dev); | |
6921 | ||
32b6d34f TY |
6922 | static int __netdev_walk_all_lower_dev(struct net_device *dev, |
6923 | int (*fn)(struct net_device *dev, | |
6924 | void *data), | |
6925 | void *data) | |
6926 | { | |
6927 | struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1]; | |
6928 | struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1]; | |
6929 | int ret, cur = 0; | |
6930 | bool ignore; | |
6931 | ||
6932 | now = dev; | |
6933 | iter = &dev->adj_list.lower; | |
6934 | ||
6935 | while (1) { | |
6936 | if (now != dev) { | |
6937 | ret = fn(now, data); | |
6938 | if (ret) | |
6939 | return ret; | |
6940 | } | |
6941 | ||
6942 | next = NULL; | |
6943 | while (1) { | |
6944 | ldev = __netdev_next_lower_dev(now, &iter, &ignore); | |
6945 | if (!ldev) | |
6946 | break; | |
6947 | if (ignore) | |
6948 | continue; | |
6949 | ||
6950 | next = ldev; | |
6951 | niter = &ldev->adj_list.lower; | |
6952 | dev_stack[cur] = now; | |
6953 | iter_stack[cur++] = iter; | |
6954 | break; | |
6955 | } | |
6956 | ||
6957 | if (!next) { | |
6958 | if (!cur) | |
6959 | return 0; | |
6960 | next = dev_stack[--cur]; | |
6961 | niter = iter_stack[cur]; | |
6962 | } | |
6963 | ||
6964 | now = next; | |
6965 | iter = niter; | |
6966 | } | |
6967 | ||
6968 | return 0; | |
6969 | } | |
6970 | ||
d25b922c TY |
6971 | struct net_device *netdev_next_lower_dev_rcu(struct net_device *dev, |
6972 | struct list_head **iter) | |
1a3f060c DA |
6973 | { |
6974 | struct netdev_adjacent *lower; | |
6975 | ||
6976 | lower = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); | |
6977 | if (&lower->list == &dev->adj_list.lower) | |
6978 | return NULL; | |
6979 | ||
6980 | *iter = &lower->list; | |
6981 | ||
6982 | return lower->dev; | |
6983 | } | |
d25b922c | 6984 | EXPORT_SYMBOL(netdev_next_lower_dev_rcu); |
1a3f060c | 6985 | |
5343da4c TY |
6986 | static u8 __netdev_upper_depth(struct net_device *dev) |
6987 | { | |
6988 | struct net_device *udev; | |
6989 | struct list_head *iter; | |
6990 | u8 max_depth = 0; | |
32b6d34f | 6991 | bool ignore; |
5343da4c TY |
6992 | |
6993 | for (iter = &dev->adj_list.upper, | |
32b6d34f | 6994 | udev = __netdev_next_upper_dev(dev, &iter, &ignore); |
5343da4c | 6995 | udev; |
32b6d34f TY |
6996 | udev = __netdev_next_upper_dev(dev, &iter, &ignore)) { |
6997 | if (ignore) | |
6998 | continue; | |
5343da4c TY |
6999 | if (max_depth < udev->upper_level) |
7000 | max_depth = udev->upper_level; | |
7001 | } | |
7002 | ||
7003 | return max_depth; | |
7004 | } | |
7005 | ||
7006 | static u8 __netdev_lower_depth(struct net_device *dev) | |
1a3f060c DA |
7007 | { |
7008 | struct net_device *ldev; | |
7009 | struct list_head *iter; | |
5343da4c | 7010 | u8 max_depth = 0; |
32b6d34f | 7011 | bool ignore; |
1a3f060c DA |
7012 | |
7013 | for (iter = &dev->adj_list.lower, | |
32b6d34f | 7014 | ldev = __netdev_next_lower_dev(dev, &iter, &ignore); |
1a3f060c | 7015 | ldev; |
32b6d34f TY |
7016 | ldev = __netdev_next_lower_dev(dev, &iter, &ignore)) { |
7017 | if (ignore) | |
7018 | continue; | |
5343da4c TY |
7019 | if (max_depth < ldev->lower_level) |
7020 | max_depth = ldev->lower_level; | |
7021 | } | |
1a3f060c | 7022 | |
5343da4c TY |
7023 | return max_depth; |
7024 | } | |
7025 | ||
7026 | static int __netdev_update_upper_level(struct net_device *dev, void *data) | |
7027 | { | |
7028 | dev->upper_level = __netdev_upper_depth(dev) + 1; | |
7029 | return 0; | |
7030 | } | |
7031 | ||
7032 | static int __netdev_update_lower_level(struct net_device *dev, void *data) | |
7033 | { | |
7034 | dev->lower_level = __netdev_lower_depth(dev) + 1; | |
7035 | return 0; | |
7036 | } | |
7037 | ||
7038 | int netdev_walk_all_lower_dev_rcu(struct net_device *dev, | |
7039 | int (*fn)(struct net_device *dev, | |
7040 | void *data), | |
7041 | void *data) | |
7042 | { | |
7043 | struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1]; | |
7044 | struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1]; | |
7045 | int ret, cur = 0; | |
7046 | ||
7047 | now = dev; | |
7048 | iter = &dev->adj_list.lower; | |
7049 | ||
7050 | while (1) { | |
7051 | if (now != dev) { | |
7052 | ret = fn(now, data); | |
7053 | if (ret) | |
7054 | return ret; | |
7055 | } | |
7056 | ||
7057 | next = NULL; | |
7058 | while (1) { | |
7059 | ldev = netdev_next_lower_dev_rcu(now, &iter); | |
7060 | if (!ldev) | |
7061 | break; | |
7062 | ||
7063 | next = ldev; | |
7064 | niter = &ldev->adj_list.lower; | |
7065 | dev_stack[cur] = now; | |
7066 | iter_stack[cur++] = iter; | |
7067 | break; | |
7068 | } | |
7069 | ||
7070 | if (!next) { | |
7071 | if (!cur) | |
7072 | return 0; | |
7073 | next = dev_stack[--cur]; | |
7074 | niter = iter_stack[cur]; | |
7075 | } | |
7076 | ||
7077 | now = next; | |
7078 | iter = niter; | |
1a3f060c DA |
7079 | } |
7080 | ||
7081 | return 0; | |
7082 | } | |
7083 | EXPORT_SYMBOL_GPL(netdev_walk_all_lower_dev_rcu); | |
7084 | ||
e001bfad | 7085 | /** |
7086 | * netdev_lower_get_first_private_rcu - Get the first ->private from the | |
7087 | * lower neighbour list, RCU | |
7088 | * variant | |
7089 | * @dev: device | |
7090 | * | |
7091 | * Gets the first netdev_adjacent->private from the dev's lower neighbour | |
7092 | * list. The caller must hold RCU read lock. | |
7093 | */ | |
7094 | void *netdev_lower_get_first_private_rcu(struct net_device *dev) | |
7095 | { | |
7096 | struct netdev_adjacent *lower; | |
7097 | ||
7098 | lower = list_first_or_null_rcu(&dev->adj_list.lower, | |
7099 | struct netdev_adjacent, list); | |
7100 | if (lower) | |
7101 | return lower->private; | |
7102 | return NULL; | |
7103 | } | |
7104 | EXPORT_SYMBOL(netdev_lower_get_first_private_rcu); | |
7105 | ||
9ff162a8 JP |
7106 | /** |
7107 | * netdev_master_upper_dev_get_rcu - Get master upper device | |
7108 | * @dev: device | |
7109 | * | |
7110 | * Find a master upper device and return pointer to it or NULL in case | |
7111 | * it's not there. The caller must hold the RCU read lock. | |
7112 | */ | |
7113 | struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev) | |
7114 | { | |
aa9d8560 | 7115 | struct netdev_adjacent *upper; |
9ff162a8 | 7116 | |
2f268f12 | 7117 | upper = list_first_or_null_rcu(&dev->adj_list.upper, |
aa9d8560 | 7118 | struct netdev_adjacent, list); |
9ff162a8 JP |
7119 | if (upper && likely(upper->master)) |
7120 | return upper->dev; | |
7121 | return NULL; | |
7122 | } | |
7123 | EXPORT_SYMBOL(netdev_master_upper_dev_get_rcu); | |
7124 | ||
0a59f3a9 | 7125 | static int netdev_adjacent_sysfs_add(struct net_device *dev, |
3ee32707 VF |
7126 | struct net_device *adj_dev, |
7127 | struct list_head *dev_list) | |
7128 | { | |
7129 | char linkname[IFNAMSIZ+7]; | |
f4563a75 | 7130 | |
3ee32707 VF |
7131 | sprintf(linkname, dev_list == &dev->adj_list.upper ? |
7132 | "upper_%s" : "lower_%s", adj_dev->name); | |
7133 | return sysfs_create_link(&(dev->dev.kobj), &(adj_dev->dev.kobj), | |
7134 | linkname); | |
7135 | } | |
0a59f3a9 | 7136 | static void netdev_adjacent_sysfs_del(struct net_device *dev, |
3ee32707 VF |
7137 | char *name, |
7138 | struct list_head *dev_list) | |
7139 | { | |
7140 | char linkname[IFNAMSIZ+7]; | |
f4563a75 | 7141 | |
3ee32707 VF |
7142 | sprintf(linkname, dev_list == &dev->adj_list.upper ? |
7143 | "upper_%s" : "lower_%s", name); | |
7144 | sysfs_remove_link(&(dev->dev.kobj), linkname); | |
7145 | } | |
7146 | ||
7ce64c79 AF |
7147 | static inline bool netdev_adjacent_is_neigh_list(struct net_device *dev, |
7148 | struct net_device *adj_dev, | |
7149 | struct list_head *dev_list) | |
7150 | { | |
7151 | return (dev_list == &dev->adj_list.upper || | |
7152 | dev_list == &dev->adj_list.lower) && | |
7153 | net_eq(dev_net(dev), dev_net(adj_dev)); | |
7154 | } | |
3ee32707 | 7155 | |
5d261913 VF |
7156 | static int __netdev_adjacent_dev_insert(struct net_device *dev, |
7157 | struct net_device *adj_dev, | |
7863c054 | 7158 | struct list_head *dev_list, |
402dae96 | 7159 | void *private, bool master) |
5d261913 VF |
7160 | { |
7161 | struct netdev_adjacent *adj; | |
842d67a7 | 7162 | int ret; |
5d261913 | 7163 | |
6ea29da1 | 7164 | adj = __netdev_find_adj(adj_dev, dev_list); |
5d261913 VF |
7165 | |
7166 | if (adj) { | |
790510d9 | 7167 | adj->ref_nr += 1; |
67b62f98 DA |
7168 | pr_debug("Insert adjacency: dev %s adj_dev %s adj->ref_nr %d\n", |
7169 | dev->name, adj_dev->name, adj->ref_nr); | |
7170 | ||
5d261913 VF |
7171 | return 0; |
7172 | } | |
7173 | ||
7174 | adj = kmalloc(sizeof(*adj), GFP_KERNEL); | |
7175 | if (!adj) | |
7176 | return -ENOMEM; | |
7177 | ||
7178 | adj->dev = adj_dev; | |
7179 | adj->master = master; | |
790510d9 | 7180 | adj->ref_nr = 1; |
402dae96 | 7181 | adj->private = private; |
32b6d34f | 7182 | adj->ignore = false; |
5d261913 | 7183 | dev_hold(adj_dev); |
2f268f12 | 7184 | |
67b62f98 DA |
7185 | pr_debug("Insert adjacency: dev %s adj_dev %s adj->ref_nr %d; dev_hold on %s\n", |
7186 | dev->name, adj_dev->name, adj->ref_nr, adj_dev->name); | |
5d261913 | 7187 | |
7ce64c79 | 7188 | if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list)) { |
3ee32707 | 7189 | ret = netdev_adjacent_sysfs_add(dev, adj_dev, dev_list); |
5831d66e VF |
7190 | if (ret) |
7191 | goto free_adj; | |
7192 | } | |
7193 | ||
7863c054 | 7194 | /* Ensure that master link is always the first item in list. */ |
842d67a7 VF |
7195 | if (master) { |
7196 | ret = sysfs_create_link(&(dev->dev.kobj), | |
7197 | &(adj_dev->dev.kobj), "master"); | |
7198 | if (ret) | |
5831d66e | 7199 | goto remove_symlinks; |
842d67a7 | 7200 | |
7863c054 | 7201 | list_add_rcu(&adj->list, dev_list); |
842d67a7 | 7202 | } else { |
7863c054 | 7203 | list_add_tail_rcu(&adj->list, dev_list); |
842d67a7 | 7204 | } |
5d261913 VF |
7205 | |
7206 | return 0; | |
842d67a7 | 7207 | |
5831d66e | 7208 | remove_symlinks: |
7ce64c79 | 7209 | if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list)) |
3ee32707 | 7210 | netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list); |
842d67a7 VF |
7211 | free_adj: |
7212 | kfree(adj); | |
974daef7 | 7213 | dev_put(adj_dev); |
842d67a7 VF |
7214 | |
7215 | return ret; | |
5d261913 VF |
7216 | } |
7217 | ||
1d143d9f | 7218 | static void __netdev_adjacent_dev_remove(struct net_device *dev, |
7219 | struct net_device *adj_dev, | |
93409033 | 7220 | u16 ref_nr, |
1d143d9f | 7221 | struct list_head *dev_list) |
5d261913 VF |
7222 | { |
7223 | struct netdev_adjacent *adj; | |
7224 | ||
67b62f98 DA |
7225 | pr_debug("Remove adjacency: dev %s adj_dev %s ref_nr %d\n", |
7226 | dev->name, adj_dev->name, ref_nr); | |
7227 | ||
6ea29da1 | 7228 | adj = __netdev_find_adj(adj_dev, dev_list); |
5d261913 | 7229 | |
2f268f12 | 7230 | if (!adj) { |
67b62f98 | 7231 | pr_err("Adjacency does not exist for device %s from %s\n", |
2f268f12 | 7232 | dev->name, adj_dev->name); |
67b62f98 DA |
7233 | WARN_ON(1); |
7234 | return; | |
2f268f12 | 7235 | } |
5d261913 | 7236 | |
93409033 | 7237 | if (adj->ref_nr > ref_nr) { |
67b62f98 DA |
7238 | pr_debug("adjacency: %s to %s ref_nr - %d = %d\n", |
7239 | dev->name, adj_dev->name, ref_nr, | |
7240 | adj->ref_nr - ref_nr); | |
93409033 | 7241 | adj->ref_nr -= ref_nr; |
5d261913 VF |
7242 | return; |
7243 | } | |
7244 | ||
842d67a7 VF |
7245 | if (adj->master) |
7246 | sysfs_remove_link(&(dev->dev.kobj), "master"); | |
7247 | ||
7ce64c79 | 7248 | if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list)) |
3ee32707 | 7249 | netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list); |
5831d66e | 7250 | |
5d261913 | 7251 | list_del_rcu(&adj->list); |
67b62f98 | 7252 | pr_debug("adjacency: dev_put for %s, because link removed from %s to %s\n", |
2f268f12 | 7253 | adj_dev->name, dev->name, adj_dev->name); |
5d261913 VF |
7254 | dev_put(adj_dev); |
7255 | kfree_rcu(adj, rcu); | |
7256 | } | |
7257 | ||
1d143d9f | 7258 | static int __netdev_adjacent_dev_link_lists(struct net_device *dev, |
7259 | struct net_device *upper_dev, | |
7260 | struct list_head *up_list, | |
7261 | struct list_head *down_list, | |
7262 | void *private, bool master) | |
5d261913 VF |
7263 | { |
7264 | int ret; | |
7265 | ||
790510d9 | 7266 | ret = __netdev_adjacent_dev_insert(dev, upper_dev, up_list, |
93409033 | 7267 | private, master); |
5d261913 VF |
7268 | if (ret) |
7269 | return ret; | |
7270 | ||
790510d9 | 7271 | ret = __netdev_adjacent_dev_insert(upper_dev, dev, down_list, |
93409033 | 7272 | private, false); |
5d261913 | 7273 | if (ret) { |
790510d9 | 7274 | __netdev_adjacent_dev_remove(dev, upper_dev, 1, up_list); |
5d261913 VF |
7275 | return ret; |
7276 | } | |
7277 | ||
7278 | return 0; | |
7279 | } | |
7280 | ||
1d143d9f | 7281 | static void __netdev_adjacent_dev_unlink_lists(struct net_device *dev, |
7282 | struct net_device *upper_dev, | |
93409033 | 7283 | u16 ref_nr, |
1d143d9f | 7284 | struct list_head *up_list, |
7285 | struct list_head *down_list) | |
5d261913 | 7286 | { |
93409033 AC |
7287 | __netdev_adjacent_dev_remove(dev, upper_dev, ref_nr, up_list); |
7288 | __netdev_adjacent_dev_remove(upper_dev, dev, ref_nr, down_list); | |
5d261913 VF |
7289 | } |
7290 | ||
1d143d9f | 7291 | static int __netdev_adjacent_dev_link_neighbour(struct net_device *dev, |
7292 | struct net_device *upper_dev, | |
7293 | void *private, bool master) | |
2f268f12 | 7294 | { |
f1170fd4 DA |
7295 | return __netdev_adjacent_dev_link_lists(dev, upper_dev, |
7296 | &dev->adj_list.upper, | |
7297 | &upper_dev->adj_list.lower, | |
7298 | private, master); | |
5d261913 VF |
7299 | } |
7300 | ||
1d143d9f | 7301 | static void __netdev_adjacent_dev_unlink_neighbour(struct net_device *dev, |
7302 | struct net_device *upper_dev) | |
2f268f12 | 7303 | { |
93409033 | 7304 | __netdev_adjacent_dev_unlink_lists(dev, upper_dev, 1, |
2f268f12 VF |
7305 | &dev->adj_list.upper, |
7306 | &upper_dev->adj_list.lower); | |
7307 | } | |
5d261913 | 7308 | |
9ff162a8 | 7309 | static int __netdev_upper_dev_link(struct net_device *dev, |
402dae96 | 7310 | struct net_device *upper_dev, bool master, |
42ab19ee DA |
7311 | void *upper_priv, void *upper_info, |
7312 | struct netlink_ext_ack *extack) | |
9ff162a8 | 7313 | { |
51d0c047 DA |
7314 | struct netdev_notifier_changeupper_info changeupper_info = { |
7315 | .info = { | |
7316 | .dev = dev, | |
42ab19ee | 7317 | .extack = extack, |
51d0c047 DA |
7318 | }, |
7319 | .upper_dev = upper_dev, | |
7320 | .master = master, | |
7321 | .linking = true, | |
7322 | .upper_info = upper_info, | |
7323 | }; | |
50d629e7 | 7324 | struct net_device *master_dev; |
5d261913 | 7325 | int ret = 0; |
9ff162a8 JP |
7326 | |
7327 | ASSERT_RTNL(); | |
7328 | ||
7329 | if (dev == upper_dev) | |
7330 | return -EBUSY; | |
7331 | ||
7332 | /* To prevent loops, check if dev is not upper device to upper_dev. */ | |
32b6d34f | 7333 | if (__netdev_has_upper_dev(upper_dev, dev)) |
9ff162a8 JP |
7334 | return -EBUSY; |
7335 | ||
5343da4c TY |
7336 | if ((dev->lower_level + upper_dev->upper_level) > MAX_NEST_DEV) |
7337 | return -EMLINK; | |
7338 | ||
50d629e7 | 7339 | if (!master) { |
32b6d34f | 7340 | if (__netdev_has_upper_dev(dev, upper_dev)) |
50d629e7 MM |
7341 | return -EEXIST; |
7342 | } else { | |
32b6d34f | 7343 | master_dev = __netdev_master_upper_dev_get(dev); |
50d629e7 MM |
7344 | if (master_dev) |
7345 | return master_dev == upper_dev ? -EEXIST : -EBUSY; | |
7346 | } | |
9ff162a8 | 7347 | |
51d0c047 | 7348 | ret = call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER, |
573c7ba0 JP |
7349 | &changeupper_info.info); |
7350 | ret = notifier_to_errno(ret); | |
7351 | if (ret) | |
7352 | return ret; | |
7353 | ||
6dffb044 | 7354 | ret = __netdev_adjacent_dev_link_neighbour(dev, upper_dev, upper_priv, |
402dae96 | 7355 | master); |
5d261913 VF |
7356 | if (ret) |
7357 | return ret; | |
9ff162a8 | 7358 | |
51d0c047 | 7359 | ret = call_netdevice_notifiers_info(NETDEV_CHANGEUPPER, |
b03804e7 IS |
7360 | &changeupper_info.info); |
7361 | ret = notifier_to_errno(ret); | |
7362 | if (ret) | |
f1170fd4 | 7363 | goto rollback; |
b03804e7 | 7364 | |
5343da4c | 7365 | __netdev_update_upper_level(dev, NULL); |
32b6d34f | 7366 | __netdev_walk_all_lower_dev(dev, __netdev_update_upper_level, NULL); |
5343da4c TY |
7367 | |
7368 | __netdev_update_lower_level(upper_dev, NULL); | |
32b6d34f TY |
7369 | __netdev_walk_all_upper_dev(upper_dev, __netdev_update_lower_level, |
7370 | NULL); | |
5343da4c | 7371 | |
9ff162a8 | 7372 | return 0; |
5d261913 | 7373 | |
f1170fd4 | 7374 | rollback: |
2f268f12 | 7375 | __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev); |
5d261913 VF |
7376 | |
7377 | return ret; | |
9ff162a8 JP |
7378 | } |
7379 | ||
7380 | /** | |
7381 | * netdev_upper_dev_link - Add a link to the upper device | |
7382 | * @dev: device | |
7383 | * @upper_dev: new upper device | |
7a006d59 | 7384 | * @extack: netlink extended ack |
9ff162a8 JP |
7385 | * |
7386 | * Adds a link to device which is upper to this one. The caller must hold | |
7387 | * the RTNL lock. On a failure a negative errno code is returned. | |
7388 | * On success the reference counts are adjusted and the function | |
7389 | * returns zero. | |
7390 | */ | |
7391 | int netdev_upper_dev_link(struct net_device *dev, | |
42ab19ee DA |
7392 | struct net_device *upper_dev, |
7393 | struct netlink_ext_ack *extack) | |
9ff162a8 | 7394 | { |
42ab19ee DA |
7395 | return __netdev_upper_dev_link(dev, upper_dev, false, |
7396 | NULL, NULL, extack); | |
9ff162a8 JP |
7397 | } |
7398 | EXPORT_SYMBOL(netdev_upper_dev_link); | |
7399 | ||
7400 | /** | |
7401 | * netdev_master_upper_dev_link - Add a master link to the upper device | |
7402 | * @dev: device | |
7403 | * @upper_dev: new upper device | |
6dffb044 | 7404 | * @upper_priv: upper device private |
29bf24af | 7405 | * @upper_info: upper info to be passed down via notifier |
7a006d59 | 7406 | * @extack: netlink extended ack |
9ff162a8 JP |
7407 | * |
7408 | * Adds a link to device which is upper to this one. In this case, only | |
7409 | * one master upper device can be linked, although other non-master devices | |
7410 | * might be linked as well. The caller must hold the RTNL lock. | |
7411 | * On a failure a negative errno code is returned. On success the reference | |
7412 | * counts are adjusted and the function returns zero. | |
7413 | */ | |
7414 | int netdev_master_upper_dev_link(struct net_device *dev, | |
6dffb044 | 7415 | struct net_device *upper_dev, |
42ab19ee DA |
7416 | void *upper_priv, void *upper_info, |
7417 | struct netlink_ext_ack *extack) | |
9ff162a8 | 7418 | { |
29bf24af | 7419 | return __netdev_upper_dev_link(dev, upper_dev, true, |
42ab19ee | 7420 | upper_priv, upper_info, extack); |
9ff162a8 JP |
7421 | } |
7422 | EXPORT_SYMBOL(netdev_master_upper_dev_link); | |
7423 | ||
7424 | /** | |
7425 | * netdev_upper_dev_unlink - Removes a link to upper device | |
7426 | * @dev: device | |
7427 | * @upper_dev: new upper device | |
7428 | * | |
7429 | * Removes a link to device which is upper to this one. The caller must hold | |
7430 | * the RTNL lock. | |
7431 | */ | |
7432 | void netdev_upper_dev_unlink(struct net_device *dev, | |
7433 | struct net_device *upper_dev) | |
7434 | { | |
51d0c047 DA |
7435 | struct netdev_notifier_changeupper_info changeupper_info = { |
7436 | .info = { | |
7437 | .dev = dev, | |
7438 | }, | |
7439 | .upper_dev = upper_dev, | |
7440 | .linking = false, | |
7441 | }; | |
f4563a75 | 7442 | |
9ff162a8 JP |
7443 | ASSERT_RTNL(); |
7444 | ||
0e4ead9d | 7445 | changeupper_info.master = netdev_master_upper_dev_get(dev) == upper_dev; |
0e4ead9d | 7446 | |
51d0c047 | 7447 | call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER, |
573c7ba0 JP |
7448 | &changeupper_info.info); |
7449 | ||
2f268f12 | 7450 | __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev); |
5d261913 | 7451 | |
51d0c047 | 7452 | call_netdevice_notifiers_info(NETDEV_CHANGEUPPER, |
0e4ead9d | 7453 | &changeupper_info.info); |
5343da4c TY |
7454 | |
7455 | __netdev_update_upper_level(dev, NULL); | |
32b6d34f | 7456 | __netdev_walk_all_lower_dev(dev, __netdev_update_upper_level, NULL); |
5343da4c TY |
7457 | |
7458 | __netdev_update_lower_level(upper_dev, NULL); | |
32b6d34f TY |
7459 | __netdev_walk_all_upper_dev(upper_dev, __netdev_update_lower_level, |
7460 | NULL); | |
9ff162a8 JP |
7461 | } |
7462 | EXPORT_SYMBOL(netdev_upper_dev_unlink); | |
7463 | ||
32b6d34f TY |
7464 | static void __netdev_adjacent_dev_set(struct net_device *upper_dev, |
7465 | struct net_device *lower_dev, | |
7466 | bool val) | |
7467 | { | |
7468 | struct netdev_adjacent *adj; | |
7469 | ||
7470 | adj = __netdev_find_adj(lower_dev, &upper_dev->adj_list.lower); | |
7471 | if (adj) | |
7472 | adj->ignore = val; | |
7473 | ||
7474 | adj = __netdev_find_adj(upper_dev, &lower_dev->adj_list.upper); | |
7475 | if (adj) | |
7476 | adj->ignore = val; | |
7477 | } | |
7478 | ||
7479 | static void netdev_adjacent_dev_disable(struct net_device *upper_dev, | |
7480 | struct net_device *lower_dev) | |
7481 | { | |
7482 | __netdev_adjacent_dev_set(upper_dev, lower_dev, true); | |
7483 | } | |
7484 | ||
7485 | static void netdev_adjacent_dev_enable(struct net_device *upper_dev, | |
7486 | struct net_device *lower_dev) | |
7487 | { | |
7488 | __netdev_adjacent_dev_set(upper_dev, lower_dev, false); | |
7489 | } | |
7490 | ||
7491 | int netdev_adjacent_change_prepare(struct net_device *old_dev, | |
7492 | struct net_device *new_dev, | |
7493 | struct net_device *dev, | |
7494 | struct netlink_ext_ack *extack) | |
7495 | { | |
7496 | int err; | |
7497 | ||
7498 | if (!new_dev) | |
7499 | return 0; | |
7500 | ||
7501 | if (old_dev && new_dev != old_dev) | |
7502 | netdev_adjacent_dev_disable(dev, old_dev); | |
7503 | ||
7504 | err = netdev_upper_dev_link(new_dev, dev, extack); | |
7505 | if (err) { | |
7506 | if (old_dev && new_dev != old_dev) | |
7507 | netdev_adjacent_dev_enable(dev, old_dev); | |
7508 | return err; | |
7509 | } | |
7510 | ||
7511 | return 0; | |
7512 | } | |
7513 | EXPORT_SYMBOL(netdev_adjacent_change_prepare); | |
7514 | ||
7515 | void netdev_adjacent_change_commit(struct net_device *old_dev, | |
7516 | struct net_device *new_dev, | |
7517 | struct net_device *dev) | |
7518 | { | |
7519 | if (!new_dev || !old_dev) | |
7520 | return; | |
7521 | ||
7522 | if (new_dev == old_dev) | |
7523 | return; | |
7524 | ||
7525 | netdev_adjacent_dev_enable(dev, old_dev); | |
7526 | netdev_upper_dev_unlink(old_dev, dev); | |
7527 | } | |
7528 | EXPORT_SYMBOL(netdev_adjacent_change_commit); | |
7529 | ||
7530 | void netdev_adjacent_change_abort(struct net_device *old_dev, | |
7531 | struct net_device *new_dev, | |
7532 | struct net_device *dev) | |
7533 | { | |
7534 | if (!new_dev) | |
7535 | return; | |
7536 | ||
7537 | if (old_dev && new_dev != old_dev) | |
7538 | netdev_adjacent_dev_enable(dev, old_dev); | |
7539 | ||
7540 | netdev_upper_dev_unlink(new_dev, dev); | |
7541 | } | |
7542 | EXPORT_SYMBOL(netdev_adjacent_change_abort); | |
7543 | ||
61bd3857 MS |
7544 | /** |
7545 | * netdev_bonding_info_change - Dispatch event about slave change | |
7546 | * @dev: device | |
4a26e453 | 7547 | * @bonding_info: info to dispatch |
61bd3857 MS |
7548 | * |
7549 | * Send NETDEV_BONDING_INFO to netdev notifiers with info. | |
7550 | * The caller must hold the RTNL lock. | |
7551 | */ | |
7552 | void netdev_bonding_info_change(struct net_device *dev, | |
7553 | struct netdev_bonding_info *bonding_info) | |
7554 | { | |
51d0c047 DA |
7555 | struct netdev_notifier_bonding_info info = { |
7556 | .info.dev = dev, | |
7557 | }; | |
61bd3857 MS |
7558 | |
7559 | memcpy(&info.bonding_info, bonding_info, | |
7560 | sizeof(struct netdev_bonding_info)); | |
51d0c047 | 7561 | call_netdevice_notifiers_info(NETDEV_BONDING_INFO, |
61bd3857 MS |
7562 | &info.info); |
7563 | } | |
7564 | EXPORT_SYMBOL(netdev_bonding_info_change); | |
7565 | ||
2ce1ee17 | 7566 | static void netdev_adjacent_add_links(struct net_device *dev) |
4c75431a AF |
7567 | { |
7568 | struct netdev_adjacent *iter; | |
7569 | ||
7570 | struct net *net = dev_net(dev); | |
7571 | ||
7572 | list_for_each_entry(iter, &dev->adj_list.upper, list) { | |
be4da0e3 | 7573 | if (!net_eq(net, dev_net(iter->dev))) |
4c75431a AF |
7574 | continue; |
7575 | netdev_adjacent_sysfs_add(iter->dev, dev, | |
7576 | &iter->dev->adj_list.lower); | |
7577 | netdev_adjacent_sysfs_add(dev, iter->dev, | |
7578 | &dev->adj_list.upper); | |
7579 | } | |
7580 | ||
7581 | list_for_each_entry(iter, &dev->adj_list.lower, list) { | |
be4da0e3 | 7582 | if (!net_eq(net, dev_net(iter->dev))) |
4c75431a AF |
7583 | continue; |
7584 | netdev_adjacent_sysfs_add(iter->dev, dev, | |
7585 | &iter->dev->adj_list.upper); | |
7586 | netdev_adjacent_sysfs_add(dev, iter->dev, | |
7587 | &dev->adj_list.lower); | |
7588 | } | |
7589 | } | |
7590 | ||
2ce1ee17 | 7591 | static void netdev_adjacent_del_links(struct net_device *dev) |
4c75431a AF |
7592 | { |
7593 | struct netdev_adjacent *iter; | |
7594 | ||
7595 | struct net *net = dev_net(dev); | |
7596 | ||
7597 | list_for_each_entry(iter, &dev->adj_list.upper, list) { | |
be4da0e3 | 7598 | if (!net_eq(net, dev_net(iter->dev))) |
4c75431a AF |
7599 | continue; |
7600 | netdev_adjacent_sysfs_del(iter->dev, dev->name, | |
7601 | &iter->dev->adj_list.lower); | |
7602 | netdev_adjacent_sysfs_del(dev, iter->dev->name, | |
7603 | &dev->adj_list.upper); | |
7604 | } | |
7605 | ||
7606 | list_for_each_entry(iter, &dev->adj_list.lower, list) { | |
be4da0e3 | 7607 | if (!net_eq(net, dev_net(iter->dev))) |
4c75431a AF |
7608 | continue; |
7609 | netdev_adjacent_sysfs_del(iter->dev, dev->name, | |
7610 | &iter->dev->adj_list.upper); | |
7611 | netdev_adjacent_sysfs_del(dev, iter->dev->name, | |
7612 | &dev->adj_list.lower); | |
7613 | } | |
7614 | } | |
7615 | ||
5bb025fa | 7616 | void netdev_adjacent_rename_links(struct net_device *dev, char *oldname) |
402dae96 | 7617 | { |
5bb025fa | 7618 | struct netdev_adjacent *iter; |
402dae96 | 7619 | |
4c75431a AF |
7620 | struct net *net = dev_net(dev); |
7621 | ||
5bb025fa | 7622 | list_for_each_entry(iter, &dev->adj_list.upper, list) { |
be4da0e3 | 7623 | if (!net_eq(net, dev_net(iter->dev))) |
4c75431a | 7624 | continue; |
5bb025fa VF |
7625 | netdev_adjacent_sysfs_del(iter->dev, oldname, |
7626 | &iter->dev->adj_list.lower); | |
7627 | netdev_adjacent_sysfs_add(iter->dev, dev, | |
7628 | &iter->dev->adj_list.lower); | |
7629 | } | |
402dae96 | 7630 | |
5bb025fa | 7631 | list_for_each_entry(iter, &dev->adj_list.lower, list) { |
be4da0e3 | 7632 | if (!net_eq(net, dev_net(iter->dev))) |
4c75431a | 7633 | continue; |
5bb025fa VF |
7634 | netdev_adjacent_sysfs_del(iter->dev, oldname, |
7635 | &iter->dev->adj_list.upper); | |
7636 | netdev_adjacent_sysfs_add(iter->dev, dev, | |
7637 | &iter->dev->adj_list.upper); | |
7638 | } | |
402dae96 | 7639 | } |
402dae96 VF |
7640 | |
7641 | void *netdev_lower_dev_get_private(struct net_device *dev, | |
7642 | struct net_device *lower_dev) | |
7643 | { | |
7644 | struct netdev_adjacent *lower; | |
7645 | ||
7646 | if (!lower_dev) | |
7647 | return NULL; | |
6ea29da1 | 7648 | lower = __netdev_find_adj(lower_dev, &dev->adj_list.lower); |
402dae96 VF |
7649 | if (!lower) |
7650 | return NULL; | |
7651 | ||
7652 | return lower->private; | |
7653 | } | |
7654 | EXPORT_SYMBOL(netdev_lower_dev_get_private); | |
7655 | ||
4085ebe8 | 7656 | |
04d48266 JP |
7657 | /** |
7658 | * netdev_lower_change - Dispatch event about lower device state change | |
7659 | * @lower_dev: device | |
7660 | * @lower_state_info: state to dispatch | |
7661 | * | |
7662 | * Send NETDEV_CHANGELOWERSTATE to netdev notifiers with info. | |
7663 | * The caller must hold the RTNL lock. | |
7664 | */ | |
7665 | void netdev_lower_state_changed(struct net_device *lower_dev, | |
7666 | void *lower_state_info) | |
7667 | { | |
51d0c047 DA |
7668 | struct netdev_notifier_changelowerstate_info changelowerstate_info = { |
7669 | .info.dev = lower_dev, | |
7670 | }; | |
04d48266 JP |
7671 | |
7672 | ASSERT_RTNL(); | |
7673 | changelowerstate_info.lower_state_info = lower_state_info; | |
51d0c047 | 7674 | call_netdevice_notifiers_info(NETDEV_CHANGELOWERSTATE, |
04d48266 JP |
7675 | &changelowerstate_info.info); |
7676 | } | |
7677 | EXPORT_SYMBOL(netdev_lower_state_changed); | |
7678 | ||
b6c40d68 PM |
7679 | static void dev_change_rx_flags(struct net_device *dev, int flags) |
7680 | { | |
d314774c SH |
7681 | const struct net_device_ops *ops = dev->netdev_ops; |
7682 | ||
d2615bf4 | 7683 | if (ops->ndo_change_rx_flags) |
d314774c | 7684 | ops->ndo_change_rx_flags(dev, flags); |
b6c40d68 PM |
7685 | } |
7686 | ||
991fb3f7 | 7687 | static int __dev_set_promiscuity(struct net_device *dev, int inc, bool notify) |
1da177e4 | 7688 | { |
b536db93 | 7689 | unsigned int old_flags = dev->flags; |
d04a48b0 EB |
7690 | kuid_t uid; |
7691 | kgid_t gid; | |
1da177e4 | 7692 | |
24023451 PM |
7693 | ASSERT_RTNL(); |
7694 | ||
dad9b335 WC |
7695 | dev->flags |= IFF_PROMISC; |
7696 | dev->promiscuity += inc; | |
7697 | if (dev->promiscuity == 0) { | |
7698 | /* | |
7699 | * Avoid overflow. | |
7700 | * If inc causes overflow, untouch promisc and return error. | |
7701 | */ | |
7702 | if (inc < 0) | |
7703 | dev->flags &= ~IFF_PROMISC; | |
7704 | else { | |
7705 | dev->promiscuity -= inc; | |
7b6cd1ce JP |
7706 | pr_warn("%s: promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n", |
7707 | dev->name); | |
dad9b335 WC |
7708 | return -EOVERFLOW; |
7709 | } | |
7710 | } | |
52609c0b | 7711 | if (dev->flags != old_flags) { |
7b6cd1ce JP |
7712 | pr_info("device %s %s promiscuous mode\n", |
7713 | dev->name, | |
7714 | dev->flags & IFF_PROMISC ? "entered" : "left"); | |
8192b0c4 DH |
7715 | if (audit_enabled) { |
7716 | current_uid_gid(&uid, &gid); | |
cdfb6b34 RGB |
7717 | audit_log(audit_context(), GFP_ATOMIC, |
7718 | AUDIT_ANOM_PROMISCUOUS, | |
7719 | "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u", | |
7720 | dev->name, (dev->flags & IFF_PROMISC), | |
7721 | (old_flags & IFF_PROMISC), | |
7722 | from_kuid(&init_user_ns, audit_get_loginuid(current)), | |
7723 | from_kuid(&init_user_ns, uid), | |
7724 | from_kgid(&init_user_ns, gid), | |
7725 | audit_get_sessionid(current)); | |
8192b0c4 | 7726 | } |
24023451 | 7727 | |
b6c40d68 | 7728 | dev_change_rx_flags(dev, IFF_PROMISC); |
1da177e4 | 7729 | } |
991fb3f7 ND |
7730 | if (notify) |
7731 | __dev_notify_flags(dev, old_flags, IFF_PROMISC); | |
dad9b335 | 7732 | return 0; |
1da177e4 LT |
7733 | } |
7734 | ||
4417da66 PM |
7735 | /** |
7736 | * dev_set_promiscuity - update promiscuity count on a device | |
7737 | * @dev: device | |
7738 | * @inc: modifier | |
7739 | * | |
7740 | * Add or remove promiscuity from a device. While the count in the device | |
7741 | * remains above zero the interface remains promiscuous. Once it hits zero | |
7742 | * the device reverts back to normal filtering operation. A negative inc | |
7743 | * value is used to drop promiscuity on the device. | |
dad9b335 | 7744 | * Return 0 if successful or a negative errno code on error. |
4417da66 | 7745 | */ |
dad9b335 | 7746 | int dev_set_promiscuity(struct net_device *dev, int inc) |
4417da66 | 7747 | { |
b536db93 | 7748 | unsigned int old_flags = dev->flags; |
dad9b335 | 7749 | int err; |
4417da66 | 7750 | |
991fb3f7 | 7751 | err = __dev_set_promiscuity(dev, inc, true); |
4b5a698e | 7752 | if (err < 0) |
dad9b335 | 7753 | return err; |
4417da66 PM |
7754 | if (dev->flags != old_flags) |
7755 | dev_set_rx_mode(dev); | |
dad9b335 | 7756 | return err; |
4417da66 | 7757 | } |
d1b19dff | 7758 | EXPORT_SYMBOL(dev_set_promiscuity); |
4417da66 | 7759 | |
991fb3f7 | 7760 | static int __dev_set_allmulti(struct net_device *dev, int inc, bool notify) |
1da177e4 | 7761 | { |
991fb3f7 | 7762 | unsigned int old_flags = dev->flags, old_gflags = dev->gflags; |
1da177e4 | 7763 | |
24023451 PM |
7764 | ASSERT_RTNL(); |
7765 | ||
1da177e4 | 7766 | dev->flags |= IFF_ALLMULTI; |
dad9b335 WC |
7767 | dev->allmulti += inc; |
7768 | if (dev->allmulti == 0) { | |
7769 | /* | |
7770 | * Avoid overflow. | |
7771 | * If inc causes overflow, untouch allmulti and return error. | |
7772 | */ | |
7773 | if (inc < 0) | |
7774 | dev->flags &= ~IFF_ALLMULTI; | |
7775 | else { | |
7776 | dev->allmulti -= inc; | |
7b6cd1ce JP |
7777 | pr_warn("%s: allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n", |
7778 | dev->name); | |
dad9b335 WC |
7779 | return -EOVERFLOW; |
7780 | } | |
7781 | } | |
24023451 | 7782 | if (dev->flags ^ old_flags) { |
b6c40d68 | 7783 | dev_change_rx_flags(dev, IFF_ALLMULTI); |
4417da66 | 7784 | dev_set_rx_mode(dev); |
991fb3f7 ND |
7785 | if (notify) |
7786 | __dev_notify_flags(dev, old_flags, | |
7787 | dev->gflags ^ old_gflags); | |
24023451 | 7788 | } |
dad9b335 | 7789 | return 0; |
4417da66 | 7790 | } |
991fb3f7 ND |
7791 | |
7792 | /** | |
7793 | * dev_set_allmulti - update allmulti count on a device | |
7794 | * @dev: device | |
7795 | * @inc: modifier | |
7796 | * | |
7797 | * Add or remove reception of all multicast frames to a device. While the | |
7798 | * count in the device remains above zero the interface remains listening | |
7799 | * to all interfaces. Once it hits zero the device reverts back to normal | |
7800 | * filtering operation. A negative @inc value is used to drop the counter | |
7801 | * when releasing a resource needing all multicasts. | |
7802 | * Return 0 if successful or a negative errno code on error. | |
7803 | */ | |
7804 | ||
7805 | int dev_set_allmulti(struct net_device *dev, int inc) | |
7806 | { | |
7807 | return __dev_set_allmulti(dev, inc, true); | |
7808 | } | |
d1b19dff | 7809 | EXPORT_SYMBOL(dev_set_allmulti); |
4417da66 PM |
7810 | |
7811 | /* | |
7812 | * Upload unicast and multicast address lists to device and | |
7813 | * configure RX filtering. When the device doesn't support unicast | |
53ccaae1 | 7814 | * filtering it is put in promiscuous mode while unicast addresses |
4417da66 PM |
7815 | * are present. |
7816 | */ | |
7817 | void __dev_set_rx_mode(struct net_device *dev) | |
7818 | { | |
d314774c SH |
7819 | const struct net_device_ops *ops = dev->netdev_ops; |
7820 | ||
4417da66 PM |
7821 | /* dev_open will call this function so the list will stay sane. */ |
7822 | if (!(dev->flags&IFF_UP)) | |
7823 | return; | |
7824 | ||
7825 | if (!netif_device_present(dev)) | |
40b77c94 | 7826 | return; |
4417da66 | 7827 | |
01789349 | 7828 | if (!(dev->priv_flags & IFF_UNICAST_FLT)) { |
4417da66 PM |
7829 | /* Unicast addresses changes may only happen under the rtnl, |
7830 | * therefore calling __dev_set_promiscuity here is safe. | |
7831 | */ | |
32e7bfc4 | 7832 | if (!netdev_uc_empty(dev) && !dev->uc_promisc) { |
991fb3f7 | 7833 | __dev_set_promiscuity(dev, 1, false); |
2d348d1f | 7834 | dev->uc_promisc = true; |
32e7bfc4 | 7835 | } else if (netdev_uc_empty(dev) && dev->uc_promisc) { |
991fb3f7 | 7836 | __dev_set_promiscuity(dev, -1, false); |
2d348d1f | 7837 | dev->uc_promisc = false; |
4417da66 | 7838 | } |
4417da66 | 7839 | } |
01789349 JP |
7840 | |
7841 | if (ops->ndo_set_rx_mode) | |
7842 | ops->ndo_set_rx_mode(dev); | |
4417da66 PM |
7843 | } |
7844 | ||
7845 | void dev_set_rx_mode(struct net_device *dev) | |
7846 | { | |
b9e40857 | 7847 | netif_addr_lock_bh(dev); |
4417da66 | 7848 | __dev_set_rx_mode(dev); |
b9e40857 | 7849 | netif_addr_unlock_bh(dev); |
1da177e4 LT |
7850 | } |
7851 | ||
f0db275a SH |
7852 | /** |
7853 | * dev_get_flags - get flags reported to userspace | |
7854 | * @dev: device | |
7855 | * | |
7856 | * Get the combination of flag bits exported through APIs to userspace. | |
7857 | */ | |
95c96174 | 7858 | unsigned int dev_get_flags(const struct net_device *dev) |
1da177e4 | 7859 | { |
95c96174 | 7860 | unsigned int flags; |
1da177e4 LT |
7861 | |
7862 | flags = (dev->flags & ~(IFF_PROMISC | | |
7863 | IFF_ALLMULTI | | |
b00055aa SR |
7864 | IFF_RUNNING | |
7865 | IFF_LOWER_UP | | |
7866 | IFF_DORMANT)) | | |
1da177e4 LT |
7867 | (dev->gflags & (IFF_PROMISC | |
7868 | IFF_ALLMULTI)); | |
7869 | ||
b00055aa SR |
7870 | if (netif_running(dev)) { |
7871 | if (netif_oper_up(dev)) | |
7872 | flags |= IFF_RUNNING; | |
7873 | if (netif_carrier_ok(dev)) | |
7874 | flags |= IFF_LOWER_UP; | |
7875 | if (netif_dormant(dev)) | |
7876 | flags |= IFF_DORMANT; | |
7877 | } | |
1da177e4 LT |
7878 | |
7879 | return flags; | |
7880 | } | |
d1b19dff | 7881 | EXPORT_SYMBOL(dev_get_flags); |
1da177e4 | 7882 | |
6d040321 PM |
7883 | int __dev_change_flags(struct net_device *dev, unsigned int flags, |
7884 | struct netlink_ext_ack *extack) | |
1da177e4 | 7885 | { |
b536db93 | 7886 | unsigned int old_flags = dev->flags; |
bd380811 | 7887 | int ret; |
1da177e4 | 7888 | |
24023451 PM |
7889 | ASSERT_RTNL(); |
7890 | ||
1da177e4 LT |
7891 | /* |
7892 | * Set the flags on our device. | |
7893 | */ | |
7894 | ||
7895 | dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP | | |
7896 | IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL | | |
7897 | IFF_AUTOMEDIA)) | | |
7898 | (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC | | |
7899 | IFF_ALLMULTI)); | |
7900 | ||
7901 | /* | |
7902 | * Load in the correct multicast list now the flags have changed. | |
7903 | */ | |
7904 | ||
b6c40d68 PM |
7905 | if ((old_flags ^ flags) & IFF_MULTICAST) |
7906 | dev_change_rx_flags(dev, IFF_MULTICAST); | |
24023451 | 7907 | |
4417da66 | 7908 | dev_set_rx_mode(dev); |
1da177e4 LT |
7909 | |
7910 | /* | |
7911 | * Have we downed the interface. We handle IFF_UP ourselves | |
7912 | * according to user attempts to set it, rather than blindly | |
7913 | * setting it. | |
7914 | */ | |
7915 | ||
7916 | ret = 0; | |
7051b88a | 7917 | if ((old_flags ^ flags) & IFF_UP) { |
7918 | if (old_flags & IFF_UP) | |
7919 | __dev_close(dev); | |
7920 | else | |
40c900aa | 7921 | ret = __dev_open(dev, extack); |
7051b88a | 7922 | } |
1da177e4 | 7923 | |
1da177e4 | 7924 | if ((flags ^ dev->gflags) & IFF_PROMISC) { |
d1b19dff | 7925 | int inc = (flags & IFF_PROMISC) ? 1 : -1; |
991fb3f7 | 7926 | unsigned int old_flags = dev->flags; |
d1b19dff | 7927 | |
1da177e4 | 7928 | dev->gflags ^= IFF_PROMISC; |
991fb3f7 ND |
7929 | |
7930 | if (__dev_set_promiscuity(dev, inc, false) >= 0) | |
7931 | if (dev->flags != old_flags) | |
7932 | dev_set_rx_mode(dev); | |
1da177e4 LT |
7933 | } |
7934 | ||
7935 | /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI | |
eb13da1a | 7936 | * is important. Some (broken) drivers set IFF_PROMISC, when |
7937 | * IFF_ALLMULTI is requested not asking us and not reporting. | |
1da177e4 LT |
7938 | */ |
7939 | if ((flags ^ dev->gflags) & IFF_ALLMULTI) { | |
d1b19dff ED |
7940 | int inc = (flags & IFF_ALLMULTI) ? 1 : -1; |
7941 | ||
1da177e4 | 7942 | dev->gflags ^= IFF_ALLMULTI; |
991fb3f7 | 7943 | __dev_set_allmulti(dev, inc, false); |
1da177e4 LT |
7944 | } |
7945 | ||
bd380811 PM |
7946 | return ret; |
7947 | } | |
7948 | ||
a528c219 ND |
7949 | void __dev_notify_flags(struct net_device *dev, unsigned int old_flags, |
7950 | unsigned int gchanges) | |
bd380811 PM |
7951 | { |
7952 | unsigned int changes = dev->flags ^ old_flags; | |
7953 | ||
a528c219 | 7954 | if (gchanges) |
7f294054 | 7955 | rtmsg_ifinfo(RTM_NEWLINK, dev, gchanges, GFP_ATOMIC); |
a528c219 | 7956 | |
bd380811 PM |
7957 | if (changes & IFF_UP) { |
7958 | if (dev->flags & IFF_UP) | |
7959 | call_netdevice_notifiers(NETDEV_UP, dev); | |
7960 | else | |
7961 | call_netdevice_notifiers(NETDEV_DOWN, dev); | |
7962 | } | |
7963 | ||
7964 | if (dev->flags & IFF_UP && | |
be9efd36 | 7965 | (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE))) { |
51d0c047 DA |
7966 | struct netdev_notifier_change_info change_info = { |
7967 | .info = { | |
7968 | .dev = dev, | |
7969 | }, | |
7970 | .flags_changed = changes, | |
7971 | }; | |
be9efd36 | 7972 | |
51d0c047 | 7973 | call_netdevice_notifiers_info(NETDEV_CHANGE, &change_info.info); |
be9efd36 | 7974 | } |
bd380811 PM |
7975 | } |
7976 | ||
7977 | /** | |
7978 | * dev_change_flags - change device settings | |
7979 | * @dev: device | |
7980 | * @flags: device state flags | |
567c5e13 | 7981 | * @extack: netlink extended ack |
bd380811 PM |
7982 | * |
7983 | * Change settings on device based state flags. The flags are | |
7984 | * in the userspace exported format. | |
7985 | */ | |
567c5e13 PM |
7986 | int dev_change_flags(struct net_device *dev, unsigned int flags, |
7987 | struct netlink_ext_ack *extack) | |
bd380811 | 7988 | { |
b536db93 | 7989 | int ret; |
991fb3f7 | 7990 | unsigned int changes, old_flags = dev->flags, old_gflags = dev->gflags; |
bd380811 | 7991 | |
6d040321 | 7992 | ret = __dev_change_flags(dev, flags, extack); |
bd380811 PM |
7993 | if (ret < 0) |
7994 | return ret; | |
7995 | ||
991fb3f7 | 7996 | changes = (old_flags ^ dev->flags) | (old_gflags ^ dev->gflags); |
a528c219 | 7997 | __dev_notify_flags(dev, old_flags, changes); |
1da177e4 LT |
7998 | return ret; |
7999 | } | |
d1b19dff | 8000 | EXPORT_SYMBOL(dev_change_flags); |
1da177e4 | 8001 | |
f51048c3 | 8002 | int __dev_set_mtu(struct net_device *dev, int new_mtu) |
2315dc91 VF |
8003 | { |
8004 | const struct net_device_ops *ops = dev->netdev_ops; | |
8005 | ||
8006 | if (ops->ndo_change_mtu) | |
8007 | return ops->ndo_change_mtu(dev, new_mtu); | |
8008 | ||
d25dda7c ED |
8009 | /* Pairs with all the lockless reads of dev->mtu in the stack */ |
8010 | WRITE_ONCE(dev->mtu, new_mtu); | |
2315dc91 VF |
8011 | return 0; |
8012 | } | |
f51048c3 | 8013 | EXPORT_SYMBOL(__dev_set_mtu); |
2315dc91 | 8014 | |
238e69d0 ED |
8015 | int dev_validate_mtu(struct net_device *dev, int new_mtu, |
8016 | struct netlink_ext_ack *extack) | |
8017 | { | |
8018 | /* MTU must be positive, and in range */ | |
8019 | if (new_mtu < 0 || new_mtu < dev->min_mtu) { | |
8020 | NL_SET_ERR_MSG(extack, "mtu less than device minimum"); | |
8021 | return -EINVAL; | |
8022 | } | |
8023 | ||
8024 | if (dev->max_mtu > 0 && new_mtu > dev->max_mtu) { | |
8025 | NL_SET_ERR_MSG(extack, "mtu greater than device maximum"); | |
8026 | return -EINVAL; | |
8027 | } | |
8028 | return 0; | |
8029 | } | |
8030 | ||
f0db275a | 8031 | /** |
7a4c53be | 8032 | * dev_set_mtu_ext - Change maximum transfer unit |
f0db275a SH |
8033 | * @dev: device |
8034 | * @new_mtu: new transfer unit | |
7a4c53be | 8035 | * @extack: netlink extended ack |
f0db275a SH |
8036 | * |
8037 | * Change the maximum transfer size of the network device. | |
8038 | */ | |
7a4c53be SH |
8039 | int dev_set_mtu_ext(struct net_device *dev, int new_mtu, |
8040 | struct netlink_ext_ack *extack) | |
1da177e4 | 8041 | { |
2315dc91 | 8042 | int err, orig_mtu; |
1da177e4 LT |
8043 | |
8044 | if (new_mtu == dev->mtu) | |
8045 | return 0; | |
8046 | ||
238e69d0 ED |
8047 | err = dev_validate_mtu(dev, new_mtu, extack); |
8048 | if (err) | |
8049 | return err; | |
1da177e4 LT |
8050 | |
8051 | if (!netif_device_present(dev)) | |
8052 | return -ENODEV; | |
8053 | ||
1d486bfb VF |
8054 | err = call_netdevice_notifiers(NETDEV_PRECHANGEMTU, dev); |
8055 | err = notifier_to_errno(err); | |
8056 | if (err) | |
8057 | return err; | |
d314774c | 8058 | |
2315dc91 VF |
8059 | orig_mtu = dev->mtu; |
8060 | err = __dev_set_mtu(dev, new_mtu); | |
d314774c | 8061 | |
2315dc91 | 8062 | if (!err) { |
af7d6cce SD |
8063 | err = call_netdevice_notifiers_mtu(NETDEV_CHANGEMTU, dev, |
8064 | orig_mtu); | |
2315dc91 VF |
8065 | err = notifier_to_errno(err); |
8066 | if (err) { | |
8067 | /* setting mtu back and notifying everyone again, | |
8068 | * so that they have a chance to revert changes. | |
8069 | */ | |
8070 | __dev_set_mtu(dev, orig_mtu); | |
af7d6cce SD |
8071 | call_netdevice_notifiers_mtu(NETDEV_CHANGEMTU, dev, |
8072 | new_mtu); | |
2315dc91 VF |
8073 | } |
8074 | } | |
1da177e4 LT |
8075 | return err; |
8076 | } | |
7a4c53be SH |
8077 | |
8078 | int dev_set_mtu(struct net_device *dev, int new_mtu) | |
8079 | { | |
8080 | struct netlink_ext_ack extack; | |
8081 | int err; | |
8082 | ||
a6bcfc89 | 8083 | memset(&extack, 0, sizeof(extack)); |
7a4c53be | 8084 | err = dev_set_mtu_ext(dev, new_mtu, &extack); |
a6bcfc89 | 8085 | if (err && extack._msg) |
7a4c53be SH |
8086 | net_err_ratelimited("%s: %s\n", dev->name, extack._msg); |
8087 | return err; | |
8088 | } | |
d1b19dff | 8089 | EXPORT_SYMBOL(dev_set_mtu); |
1da177e4 | 8090 | |
6a643ddb CW |
8091 | /** |
8092 | * dev_change_tx_queue_len - Change TX queue length of a netdevice | |
8093 | * @dev: device | |
8094 | * @new_len: new tx queue length | |
8095 | */ | |
8096 | int dev_change_tx_queue_len(struct net_device *dev, unsigned long new_len) | |
8097 | { | |
8098 | unsigned int orig_len = dev->tx_queue_len; | |
8099 | int res; | |
8100 | ||
8101 | if (new_len != (unsigned int)new_len) | |
8102 | return -ERANGE; | |
8103 | ||
8104 | if (new_len != orig_len) { | |
8105 | dev->tx_queue_len = new_len; | |
8106 | res = call_netdevice_notifiers(NETDEV_CHANGE_TX_QUEUE_LEN, dev); | |
8107 | res = notifier_to_errno(res); | |
7effaf06 TT |
8108 | if (res) |
8109 | goto err_rollback; | |
8110 | res = dev_qdisc_change_tx_queue_len(dev); | |
8111 | if (res) | |
8112 | goto err_rollback; | |
6a643ddb CW |
8113 | } |
8114 | ||
8115 | return 0; | |
7effaf06 TT |
8116 | |
8117 | err_rollback: | |
8118 | netdev_err(dev, "refused to change device tx_queue_len\n"); | |
8119 | dev->tx_queue_len = orig_len; | |
8120 | return res; | |
6a643ddb CW |
8121 | } |
8122 | ||
cbda10fa VD |
8123 | /** |
8124 | * dev_set_group - Change group this device belongs to | |
8125 | * @dev: device | |
8126 | * @new_group: group this device should belong to | |
8127 | */ | |
8128 | void dev_set_group(struct net_device *dev, int new_group) | |
8129 | { | |
8130 | dev->group = new_group; | |
8131 | } | |
8132 | EXPORT_SYMBOL(dev_set_group); | |
8133 | ||
d59cdf94 PM |
8134 | /** |
8135 | * dev_pre_changeaddr_notify - Call NETDEV_PRE_CHANGEADDR. | |
8136 | * @dev: device | |
8137 | * @addr: new address | |
8138 | * @extack: netlink extended ack | |
8139 | */ | |
8140 | int dev_pre_changeaddr_notify(struct net_device *dev, const char *addr, | |
8141 | struct netlink_ext_ack *extack) | |
8142 | { | |
8143 | struct netdev_notifier_pre_changeaddr_info info = { | |
8144 | .info.dev = dev, | |
8145 | .info.extack = extack, | |
8146 | .dev_addr = addr, | |
8147 | }; | |
8148 | int rc; | |
8149 | ||
8150 | rc = call_netdevice_notifiers_info(NETDEV_PRE_CHANGEADDR, &info.info); | |
8151 | return notifier_to_errno(rc); | |
8152 | } | |
8153 | EXPORT_SYMBOL(dev_pre_changeaddr_notify); | |
8154 | ||
f0db275a SH |
8155 | /** |
8156 | * dev_set_mac_address - Change Media Access Control Address | |
8157 | * @dev: device | |
8158 | * @sa: new address | |
3a37a963 | 8159 | * @extack: netlink extended ack |
f0db275a SH |
8160 | * |
8161 | * Change the hardware (MAC) address of the device | |
8162 | */ | |
3a37a963 PM |
8163 | int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa, |
8164 | struct netlink_ext_ack *extack) | |
1da177e4 | 8165 | { |
d314774c | 8166 | const struct net_device_ops *ops = dev->netdev_ops; |
1da177e4 LT |
8167 | int err; |
8168 | ||
d314774c | 8169 | if (!ops->ndo_set_mac_address) |
1da177e4 LT |
8170 | return -EOPNOTSUPP; |
8171 | if (sa->sa_family != dev->type) | |
8172 | return -EINVAL; | |
8173 | if (!netif_device_present(dev)) | |
8174 | return -ENODEV; | |
d59cdf94 PM |
8175 | err = dev_pre_changeaddr_notify(dev, sa->sa_data, extack); |
8176 | if (err) | |
8177 | return err; | |
d314774c | 8178 | err = ops->ndo_set_mac_address(dev, sa); |
f6521516 JP |
8179 | if (err) |
8180 | return err; | |
fbdeca2d | 8181 | dev->addr_assign_type = NET_ADDR_SET; |
f6521516 | 8182 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); |
7bf23575 | 8183 | add_device_randomness(dev->dev_addr, dev->addr_len); |
f6521516 | 8184 | return 0; |
1da177e4 | 8185 | } |
d1b19dff | 8186 | EXPORT_SYMBOL(dev_set_mac_address); |
1da177e4 | 8187 | |
43b79d50 CW |
8188 | static DECLARE_RWSEM(dev_addr_sem); |
8189 | ||
8190 | int dev_set_mac_address_user(struct net_device *dev, struct sockaddr *sa, | |
8191 | struct netlink_ext_ack *extack) | |
8192 | { | |
8193 | int ret; | |
8194 | ||
8195 | down_write(&dev_addr_sem); | |
8196 | ret = dev_set_mac_address(dev, sa, extack); | |
8197 | up_write(&dev_addr_sem); | |
8198 | return ret; | |
8199 | } | |
8200 | EXPORT_SYMBOL(dev_set_mac_address_user); | |
8201 | ||
8202 | int dev_get_mac_address(struct sockaddr *sa, struct net *net, char *dev_name) | |
8203 | { | |
8204 | size_t size = sizeof(sa->sa_data); | |
8205 | struct net_device *dev; | |
8206 | int ret = 0; | |
8207 | ||
8208 | down_read(&dev_addr_sem); | |
8209 | rcu_read_lock(); | |
8210 | ||
8211 | dev = dev_get_by_name_rcu(net, dev_name); | |
8212 | if (!dev) { | |
8213 | ret = -ENODEV; | |
8214 | goto unlock; | |
8215 | } | |
8216 | if (!dev->addr_len) | |
8217 | memset(sa->sa_data, 0, size); | |
8218 | else | |
8219 | memcpy(sa->sa_data, dev->dev_addr, | |
8220 | min_t(size_t, size, dev->addr_len)); | |
8221 | sa->sa_family = dev->type; | |
8222 | ||
8223 | unlock: | |
8224 | rcu_read_unlock(); | |
8225 | up_read(&dev_addr_sem); | |
8226 | return ret; | |
8227 | } | |
8228 | EXPORT_SYMBOL(dev_get_mac_address); | |
8229 | ||
4bf84c35 JP |
8230 | /** |
8231 | * dev_change_carrier - Change device carrier | |
8232 | * @dev: device | |
691b3b7e | 8233 | * @new_carrier: new value |
4bf84c35 JP |
8234 | * |
8235 | * Change device carrier | |
8236 | */ | |
8237 | int dev_change_carrier(struct net_device *dev, bool new_carrier) | |
8238 | { | |
8239 | const struct net_device_ops *ops = dev->netdev_ops; | |
8240 | ||
8241 | if (!ops->ndo_change_carrier) | |
8242 | return -EOPNOTSUPP; | |
8243 | if (!netif_device_present(dev)) | |
8244 | return -ENODEV; | |
8245 | return ops->ndo_change_carrier(dev, new_carrier); | |
8246 | } | |
8247 | EXPORT_SYMBOL(dev_change_carrier); | |
8248 | ||
66b52b0d JP |
8249 | /** |
8250 | * dev_get_phys_port_id - Get device physical port ID | |
8251 | * @dev: device | |
8252 | * @ppid: port ID | |
8253 | * | |
8254 | * Get device physical port ID | |
8255 | */ | |
8256 | int dev_get_phys_port_id(struct net_device *dev, | |
02637fce | 8257 | struct netdev_phys_item_id *ppid) |
66b52b0d JP |
8258 | { |
8259 | const struct net_device_ops *ops = dev->netdev_ops; | |
8260 | ||
8261 | if (!ops->ndo_get_phys_port_id) | |
8262 | return -EOPNOTSUPP; | |
8263 | return ops->ndo_get_phys_port_id(dev, ppid); | |
8264 | } | |
8265 | EXPORT_SYMBOL(dev_get_phys_port_id); | |
8266 | ||
db24a904 DA |
8267 | /** |
8268 | * dev_get_phys_port_name - Get device physical port name | |
8269 | * @dev: device | |
8270 | * @name: port name | |
ed49e650 | 8271 | * @len: limit of bytes to copy to name |
db24a904 DA |
8272 | * |
8273 | * Get device physical port name | |
8274 | */ | |
8275 | int dev_get_phys_port_name(struct net_device *dev, | |
8276 | char *name, size_t len) | |
8277 | { | |
8278 | const struct net_device_ops *ops = dev->netdev_ops; | |
af3836df | 8279 | int err; |
db24a904 | 8280 | |
af3836df JP |
8281 | if (ops->ndo_get_phys_port_name) { |
8282 | err = ops->ndo_get_phys_port_name(dev, name, len); | |
8283 | if (err != -EOPNOTSUPP) | |
8284 | return err; | |
8285 | } | |
8286 | return devlink_compat_phys_port_name_get(dev, name, len); | |
db24a904 DA |
8287 | } |
8288 | EXPORT_SYMBOL(dev_get_phys_port_name); | |
8289 | ||
d6abc596 FF |
8290 | /** |
8291 | * dev_get_port_parent_id - Get the device's port parent identifier | |
8292 | * @dev: network device | |
8293 | * @ppid: pointer to a storage for the port's parent identifier | |
8294 | * @recurse: allow/disallow recursion to lower devices | |
8295 | * | |
8296 | * Get the devices's port parent identifier | |
8297 | */ | |
8298 | int dev_get_port_parent_id(struct net_device *dev, | |
8299 | struct netdev_phys_item_id *ppid, | |
8300 | bool recurse) | |
8301 | { | |
8302 | const struct net_device_ops *ops = dev->netdev_ops; | |
8303 | struct netdev_phys_item_id first = { }; | |
8304 | struct net_device *lower_dev; | |
8305 | struct list_head *iter; | |
7e1146e8 JP |
8306 | int err; |
8307 | ||
8308 | if (ops->ndo_get_port_parent_id) { | |
8309 | err = ops->ndo_get_port_parent_id(dev, ppid); | |
8310 | if (err != -EOPNOTSUPP) | |
8311 | return err; | |
8312 | } | |
d6abc596 | 8313 | |
7e1146e8 JP |
8314 | err = devlink_compat_switch_id_get(dev, ppid); |
8315 | if (!err || err != -EOPNOTSUPP) | |
8316 | return err; | |
d6abc596 FF |
8317 | |
8318 | if (!recurse) | |
7e1146e8 | 8319 | return -EOPNOTSUPP; |
d6abc596 FF |
8320 | |
8321 | netdev_for_each_lower_dev(dev, lower_dev, iter) { | |
8322 | err = dev_get_port_parent_id(lower_dev, ppid, recurse); | |
8323 | if (err) | |
8324 | break; | |
8325 | if (!first.id_len) | |
8326 | first = *ppid; | |
8327 | else if (memcmp(&first, ppid, sizeof(*ppid))) | |
4bbecdd9 | 8328 | return -EOPNOTSUPP; |
d6abc596 FF |
8329 | } |
8330 | ||
8331 | return err; | |
8332 | } | |
8333 | EXPORT_SYMBOL(dev_get_port_parent_id); | |
8334 | ||
8335 | /** | |
8336 | * netdev_port_same_parent_id - Indicate if two network devices have | |
8337 | * the same port parent identifier | |
8338 | * @a: first network device | |
8339 | * @b: second network device | |
8340 | */ | |
8341 | bool netdev_port_same_parent_id(struct net_device *a, struct net_device *b) | |
8342 | { | |
8343 | struct netdev_phys_item_id a_id = { }; | |
8344 | struct netdev_phys_item_id b_id = { }; | |
8345 | ||
8346 | if (dev_get_port_parent_id(a, &a_id, true) || | |
8347 | dev_get_port_parent_id(b, &b_id, true)) | |
8348 | return false; | |
8349 | ||
8350 | return netdev_phys_item_id_same(&a_id, &b_id); | |
8351 | } | |
8352 | EXPORT_SYMBOL(netdev_port_same_parent_id); | |
8353 | ||
d746d707 AK |
8354 | /** |
8355 | * dev_change_proto_down - update protocol port state information | |
8356 | * @dev: device | |
8357 | * @proto_down: new value | |
8358 | * | |
8359 | * This info can be used by switch drivers to set the phys state of the | |
8360 | * port. | |
8361 | */ | |
8362 | int dev_change_proto_down(struct net_device *dev, bool proto_down) | |
8363 | { | |
8364 | const struct net_device_ops *ops = dev->netdev_ops; | |
8365 | ||
8366 | if (!ops->ndo_change_proto_down) | |
8367 | return -EOPNOTSUPP; | |
8368 | if (!netif_device_present(dev)) | |
8369 | return -ENODEV; | |
8370 | return ops->ndo_change_proto_down(dev, proto_down); | |
8371 | } | |
8372 | EXPORT_SYMBOL(dev_change_proto_down); | |
8373 | ||
b5899679 AR |
8374 | /** |
8375 | * dev_change_proto_down_generic - generic implementation for | |
8376 | * ndo_change_proto_down that sets carrier according to | |
8377 | * proto_down. | |
8378 | * | |
8379 | * @dev: device | |
8380 | * @proto_down: new value | |
8381 | */ | |
8382 | int dev_change_proto_down_generic(struct net_device *dev, bool proto_down) | |
8383 | { | |
8384 | if (proto_down) | |
8385 | netif_carrier_off(dev); | |
8386 | else | |
8387 | netif_carrier_on(dev); | |
8388 | dev->proto_down = proto_down; | |
8389 | return 0; | |
8390 | } | |
8391 | EXPORT_SYMBOL(dev_change_proto_down_generic); | |
8392 | ||
a25717d2 JK |
8393 | u32 __dev_xdp_query(struct net_device *dev, bpf_op_t bpf_op, |
8394 | enum bpf_netdev_command cmd) | |
d67b9cd2 | 8395 | { |
a25717d2 | 8396 | struct netdev_bpf xdp; |
d67b9cd2 | 8397 | |
a25717d2 JK |
8398 | if (!bpf_op) |
8399 | return 0; | |
118b4aa2 | 8400 | |
a25717d2 JK |
8401 | memset(&xdp, 0, sizeof(xdp)); |
8402 | xdp.command = cmd; | |
118b4aa2 | 8403 | |
a25717d2 JK |
8404 | /* Query must always succeed. */ |
8405 | WARN_ON(bpf_op(dev, &xdp) < 0 && cmd == XDP_QUERY_PROG); | |
58038695 | 8406 | |
6b867589 | 8407 | return xdp.prog_id; |
d67b9cd2 DB |
8408 | } |
8409 | ||
f4e63525 | 8410 | static int dev_xdp_install(struct net_device *dev, bpf_op_t bpf_op, |
32d60277 | 8411 | struct netlink_ext_ack *extack, u32 flags, |
d67b9cd2 DB |
8412 | struct bpf_prog *prog) |
8413 | { | |
f4e63525 | 8414 | struct netdev_bpf xdp; |
d67b9cd2 DB |
8415 | |
8416 | memset(&xdp, 0, sizeof(xdp)); | |
ee5d032f JK |
8417 | if (flags & XDP_FLAGS_HW_MODE) |
8418 | xdp.command = XDP_SETUP_PROG_HW; | |
8419 | else | |
8420 | xdp.command = XDP_SETUP_PROG; | |
d67b9cd2 | 8421 | xdp.extack = extack; |
32d60277 | 8422 | xdp.flags = flags; |
d67b9cd2 DB |
8423 | xdp.prog = prog; |
8424 | ||
f4e63525 | 8425 | return bpf_op(dev, &xdp); |
d67b9cd2 DB |
8426 | } |
8427 | ||
bd0b2e7f JK |
8428 | static void dev_xdp_uninstall(struct net_device *dev) |
8429 | { | |
8430 | struct netdev_bpf xdp; | |
8431 | bpf_op_t ndo_bpf; | |
8432 | ||
8433 | /* Remove generic XDP */ | |
8434 | WARN_ON(dev_xdp_install(dev, generic_xdp_install, NULL, 0, NULL)); | |
8435 | ||
8436 | /* Remove from the driver */ | |
8437 | ndo_bpf = dev->netdev_ops->ndo_bpf; | |
8438 | if (!ndo_bpf) | |
8439 | return; | |
8440 | ||
a25717d2 JK |
8441 | memset(&xdp, 0, sizeof(xdp)); |
8442 | xdp.command = XDP_QUERY_PROG; | |
8443 | WARN_ON(ndo_bpf(dev, &xdp)); | |
8444 | if (xdp.prog_id) | |
8445 | WARN_ON(dev_xdp_install(dev, ndo_bpf, NULL, xdp.prog_flags, | |
8446 | NULL)); | |
bd0b2e7f | 8447 | |
a25717d2 JK |
8448 | /* Remove HW offload */ |
8449 | memset(&xdp, 0, sizeof(xdp)); | |
8450 | xdp.command = XDP_QUERY_PROG_HW; | |
8451 | if (!ndo_bpf(dev, &xdp) && xdp.prog_id) | |
8452 | WARN_ON(dev_xdp_install(dev, ndo_bpf, NULL, xdp.prog_flags, | |
8453 | NULL)); | |
bd0b2e7f JK |
8454 | } |
8455 | ||
a7862b45 BB |
8456 | /** |
8457 | * dev_change_xdp_fd - set or clear a bpf program for a device rx path | |
8458 | * @dev: device | |
b5d60989 | 8459 | * @extack: netlink extended ack |
a7862b45 | 8460 | * @fd: new program fd or negative value to clear |
85de8576 | 8461 | * @flags: xdp-related flags |
a7862b45 BB |
8462 | * |
8463 | * Set or clear a bpf program for a device | |
8464 | */ | |
ddf9f970 JK |
8465 | int dev_change_xdp_fd(struct net_device *dev, struct netlink_ext_ack *extack, |
8466 | int fd, u32 flags) | |
a7862b45 BB |
8467 | { |
8468 | const struct net_device_ops *ops = dev->netdev_ops; | |
a25717d2 | 8469 | enum bpf_netdev_command query; |
a7862b45 | 8470 | struct bpf_prog *prog = NULL; |
f4e63525 | 8471 | bpf_op_t bpf_op, bpf_chk; |
9ee963d6 | 8472 | bool offload; |
a7862b45 BB |
8473 | int err; |
8474 | ||
85de8576 DB |
8475 | ASSERT_RTNL(); |
8476 | ||
9ee963d6 JK |
8477 | offload = flags & XDP_FLAGS_HW_MODE; |
8478 | query = offload ? XDP_QUERY_PROG_HW : XDP_QUERY_PROG; | |
a25717d2 | 8479 | |
f4e63525 | 8480 | bpf_op = bpf_chk = ops->ndo_bpf; |
01dde20c MF |
8481 | if (!bpf_op && (flags & (XDP_FLAGS_DRV_MODE | XDP_FLAGS_HW_MODE))) { |
8482 | NL_SET_ERR_MSG(extack, "underlying driver does not support XDP in native mode"); | |
0489df9a | 8483 | return -EOPNOTSUPP; |
01dde20c | 8484 | } |
f4e63525 JK |
8485 | if (!bpf_op || (flags & XDP_FLAGS_SKB_MODE)) |
8486 | bpf_op = generic_xdp_install; | |
8487 | if (bpf_op == bpf_chk) | |
8488 | bpf_chk = generic_xdp_install; | |
b5cdae32 | 8489 | |
a7862b45 | 8490 | if (fd >= 0) { |
c14a9f63 MM |
8491 | u32 prog_id; |
8492 | ||
9ee963d6 | 8493 | if (!offload && __dev_xdp_query(dev, bpf_chk, XDP_QUERY_PROG)) { |
01dde20c | 8494 | NL_SET_ERR_MSG(extack, "native and generic XDP can't be active at the same time"); |
d67b9cd2 | 8495 | return -EEXIST; |
01dde20c | 8496 | } |
c14a9f63 MM |
8497 | |
8498 | prog_id = __dev_xdp_query(dev, bpf_op, query); | |
8499 | if ((flags & XDP_FLAGS_UPDATE_IF_NOEXIST) && prog_id) { | |
01dde20c | 8500 | NL_SET_ERR_MSG(extack, "XDP program already attached"); |
d67b9cd2 | 8501 | return -EBUSY; |
01dde20c | 8502 | } |
85de8576 | 8503 | |
288b3de5 JK |
8504 | prog = bpf_prog_get_type_dev(fd, BPF_PROG_TYPE_XDP, |
8505 | bpf_op == ops->ndo_bpf); | |
a7862b45 BB |
8506 | if (IS_ERR(prog)) |
8507 | return PTR_ERR(prog); | |
441a3303 | 8508 | |
9ee963d6 | 8509 | if (!offload && bpf_prog_is_dev_bound(prog->aux)) { |
441a3303 JK |
8510 | NL_SET_ERR_MSG(extack, "using device-bound program without HW_MODE flag is not supported"); |
8511 | bpf_prog_put(prog); | |
8512 | return -EINVAL; | |
8513 | } | |
c14a9f63 | 8514 | |
aefc3e72 JK |
8515 | /* prog->aux->id may be 0 for orphaned device-bound progs */ |
8516 | if (prog->aux->id && prog->aux->id == prog_id) { | |
c14a9f63 MM |
8517 | bpf_prog_put(prog); |
8518 | return 0; | |
8519 | } | |
8520 | } else { | |
8521 | if (!__dev_xdp_query(dev, bpf_op, query)) | |
8522 | return 0; | |
a7862b45 BB |
8523 | } |
8524 | ||
f4e63525 | 8525 | err = dev_xdp_install(dev, bpf_op, extack, flags, prog); |
a7862b45 BB |
8526 | if (err < 0 && prog) |
8527 | bpf_prog_put(prog); | |
8528 | ||
8529 | return err; | |
8530 | } | |
a7862b45 | 8531 | |
1da177e4 LT |
8532 | /** |
8533 | * dev_new_index - allocate an ifindex | |
c4ea43c5 | 8534 | * @net: the applicable net namespace |
1da177e4 LT |
8535 | * |
8536 | * Returns a suitable unique value for a new device interface | |
8537 | * number. The caller must hold the rtnl semaphore or the | |
8538 | * dev_base_lock to be sure it remains unique. | |
8539 | */ | |
881d966b | 8540 | static int dev_new_index(struct net *net) |
1da177e4 | 8541 | { |
aa79e66e | 8542 | int ifindex = net->ifindex; |
f4563a75 | 8543 | |
1da177e4 LT |
8544 | for (;;) { |
8545 | if (++ifindex <= 0) | |
8546 | ifindex = 1; | |
881d966b | 8547 | if (!__dev_get_by_index(net, ifindex)) |
aa79e66e | 8548 | return net->ifindex = ifindex; |
1da177e4 LT |
8549 | } |
8550 | } | |
8551 | ||
1da177e4 | 8552 | /* Delayed registration/unregisteration */ |
3b5b34fd | 8553 | static LIST_HEAD(net_todo_list); |
200b916f | 8554 | DECLARE_WAIT_QUEUE_HEAD(netdev_unregistering_wq); |
1da177e4 | 8555 | |
6f05f629 | 8556 | static void net_set_todo(struct net_device *dev) |
1da177e4 | 8557 | { |
1da177e4 | 8558 | list_add_tail(&dev->todo_list, &net_todo_list); |
50624c93 | 8559 | dev_net(dev)->dev_unreg_count++; |
1da177e4 LT |
8560 | } |
8561 | ||
9b5e383c | 8562 | static void rollback_registered_many(struct list_head *head) |
93ee31f1 | 8563 | { |
e93737b0 | 8564 | struct net_device *dev, *tmp; |
5cde2829 | 8565 | LIST_HEAD(close_head); |
9b5e383c | 8566 | |
93ee31f1 DL |
8567 | BUG_ON(dev_boot_phase); |
8568 | ASSERT_RTNL(); | |
8569 | ||
e93737b0 | 8570 | list_for_each_entry_safe(dev, tmp, head, unreg_list) { |
9b5e383c | 8571 | /* Some devices call without registering |
e93737b0 KK |
8572 | * for initialization unwind. Remove those |
8573 | * devices and proceed with the remaining. | |
9b5e383c ED |
8574 | */ |
8575 | if (dev->reg_state == NETREG_UNINITIALIZED) { | |
7b6cd1ce JP |
8576 | pr_debug("unregister_netdevice: device %s/%p never was registered\n", |
8577 | dev->name, dev); | |
93ee31f1 | 8578 | |
9b5e383c | 8579 | WARN_ON(1); |
e93737b0 KK |
8580 | list_del(&dev->unreg_list); |
8581 | continue; | |
9b5e383c | 8582 | } |
449f4544 | 8583 | dev->dismantle = true; |
9b5e383c | 8584 | BUG_ON(dev->reg_state != NETREG_REGISTERED); |
44345724 | 8585 | } |
93ee31f1 | 8586 | |
44345724 | 8587 | /* If device is running, close it first. */ |
5cde2829 EB |
8588 | list_for_each_entry(dev, head, unreg_list) |
8589 | list_add_tail(&dev->close_list, &close_head); | |
99c4a26a | 8590 | dev_close_many(&close_head, true); |
93ee31f1 | 8591 | |
44345724 | 8592 | list_for_each_entry(dev, head, unreg_list) { |
9b5e383c ED |
8593 | /* And unlink it from device chain. */ |
8594 | unlist_netdevice(dev); | |
93ee31f1 | 8595 | |
9b5e383c ED |
8596 | dev->reg_state = NETREG_UNREGISTERING; |
8597 | } | |
41852497 | 8598 | flush_all_backlogs(); |
93ee31f1 DL |
8599 | |
8600 | synchronize_net(); | |
8601 | ||
9b5e383c | 8602 | list_for_each_entry(dev, head, unreg_list) { |
395eea6c MB |
8603 | struct sk_buff *skb = NULL; |
8604 | ||
9b5e383c ED |
8605 | /* Shutdown queueing discipline. */ |
8606 | dev_shutdown(dev); | |
93ee31f1 | 8607 | |
bd0b2e7f | 8608 | dev_xdp_uninstall(dev); |
93ee31f1 | 8609 | |
9b5e383c | 8610 | /* Notify protocols, that we are about to destroy |
eb13da1a | 8611 | * this device. They should clean all the things. |
8612 | */ | |
9b5e383c | 8613 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); |
93ee31f1 | 8614 | |
395eea6c MB |
8615 | if (!dev->rtnl_link_ops || |
8616 | dev->rtnl_link_state == RTNL_LINK_INITIALIZED) | |
3d3ea5af | 8617 | skb = rtmsg_ifinfo_build_skb(RTM_DELLINK, dev, ~0U, 0, |
38e01b30 | 8618 | GFP_KERNEL, NULL, 0); |
395eea6c | 8619 | |
9b5e383c ED |
8620 | /* |
8621 | * Flush the unicast and multicast chains | |
8622 | */ | |
a748ee24 | 8623 | dev_uc_flush(dev); |
22bedad3 | 8624 | dev_mc_flush(dev); |
93ee31f1 | 8625 | |
9b5e383c ED |
8626 | if (dev->netdev_ops->ndo_uninit) |
8627 | dev->netdev_ops->ndo_uninit(dev); | |
93ee31f1 | 8628 | |
395eea6c MB |
8629 | if (skb) |
8630 | rtmsg_ifinfo_send(skb, dev, GFP_KERNEL); | |
56bfa7ee | 8631 | |
9ff162a8 JP |
8632 | /* Notifier chain MUST detach us all upper devices. */ |
8633 | WARN_ON(netdev_has_any_upper_dev(dev)); | |
0f524a80 | 8634 | WARN_ON(netdev_has_any_lower_dev(dev)); |
93ee31f1 | 8635 | |
9b5e383c ED |
8636 | /* Remove entries from kobject tree */ |
8637 | netdev_unregister_kobject(dev); | |
024e9679 AD |
8638 | #ifdef CONFIG_XPS |
8639 | /* Remove XPS queueing entries */ | |
8640 | netif_reset_xps_queues_gt(dev, 0); | |
8641 | #endif | |
9b5e383c | 8642 | } |
93ee31f1 | 8643 | |
850a545b | 8644 | synchronize_net(); |
395264d5 | 8645 | |
a5ee1551 | 8646 | list_for_each_entry(dev, head, unreg_list) |
9b5e383c ED |
8647 | dev_put(dev); |
8648 | } | |
8649 | ||
8650 | static void rollback_registered(struct net_device *dev) | |
8651 | { | |
8652 | LIST_HEAD(single); | |
8653 | ||
8654 | list_add(&dev->unreg_list, &single); | |
8655 | rollback_registered_many(&single); | |
ceaaec98 | 8656 | list_del(&single); |
93ee31f1 DL |
8657 | } |
8658 | ||
fd867d51 JW |
8659 | static netdev_features_t netdev_sync_upper_features(struct net_device *lower, |
8660 | struct net_device *upper, netdev_features_t features) | |
8661 | { | |
8662 | netdev_features_t upper_disables = NETIF_F_UPPER_DISABLES; | |
8663 | netdev_features_t feature; | |
5ba3f7d6 | 8664 | int feature_bit; |
fd867d51 | 8665 | |
3b89ea9c | 8666 | for_each_netdev_feature(upper_disables, feature_bit) { |
5ba3f7d6 | 8667 | feature = __NETIF_F_BIT(feature_bit); |
fd867d51 JW |
8668 | if (!(upper->wanted_features & feature) |
8669 | && (features & feature)) { | |
8670 | netdev_dbg(lower, "Dropping feature %pNF, upper dev %s has it off.\n", | |
8671 | &feature, upper->name); | |
8672 | features &= ~feature; | |
8673 | } | |
8674 | } | |
8675 | ||
8676 | return features; | |
8677 | } | |
8678 | ||
8679 | static void netdev_sync_lower_features(struct net_device *upper, | |
8680 | struct net_device *lower, netdev_features_t features) | |
8681 | { | |
8682 | netdev_features_t upper_disables = NETIF_F_UPPER_DISABLES; | |
8683 | netdev_features_t feature; | |
5ba3f7d6 | 8684 | int feature_bit; |
fd867d51 | 8685 | |
3b89ea9c | 8686 | for_each_netdev_feature(upper_disables, feature_bit) { |
5ba3f7d6 | 8687 | feature = __NETIF_F_BIT(feature_bit); |
fd867d51 JW |
8688 | if (!(features & feature) && (lower->features & feature)) { |
8689 | netdev_dbg(upper, "Disabling feature %pNF on lower dev %s.\n", | |
8690 | &feature, lower->name); | |
8691 | lower->wanted_features &= ~feature; | |
f356ca51 | 8692 | __netdev_update_features(lower); |
fd867d51 JW |
8693 | |
8694 | if (unlikely(lower->features & feature)) | |
8695 | netdev_WARN(upper, "failed to disable %pNF on %s!\n", | |
8696 | &feature, lower->name); | |
f356ca51 CW |
8697 | else |
8698 | netdev_features_change(lower); | |
fd867d51 JW |
8699 | } |
8700 | } | |
8701 | } | |
8702 | ||
c8f44aff MM |
8703 | static netdev_features_t netdev_fix_features(struct net_device *dev, |
8704 | netdev_features_t features) | |
b63365a2 | 8705 | { |
57422dc5 MM |
8706 | /* Fix illegal checksum combinations */ |
8707 | if ((features & NETIF_F_HW_CSUM) && | |
8708 | (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) { | |
6f404e44 | 8709 | netdev_warn(dev, "mixed HW and IP checksum settings.\n"); |
57422dc5 MM |
8710 | features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM); |
8711 | } | |
8712 | ||
b63365a2 | 8713 | /* TSO requires that SG is present as well. */ |
ea2d3688 | 8714 | if ((features & NETIF_F_ALL_TSO) && !(features & NETIF_F_SG)) { |
6f404e44 | 8715 | netdev_dbg(dev, "Dropping TSO features since no SG feature.\n"); |
ea2d3688 | 8716 | features &= ~NETIF_F_ALL_TSO; |
b63365a2 HX |
8717 | } |
8718 | ||
ec5f0615 PS |
8719 | if ((features & NETIF_F_TSO) && !(features & NETIF_F_HW_CSUM) && |
8720 | !(features & NETIF_F_IP_CSUM)) { | |
8721 | netdev_dbg(dev, "Dropping TSO features since no CSUM feature.\n"); | |
8722 | features &= ~NETIF_F_TSO; | |
8723 | features &= ~NETIF_F_TSO_ECN; | |
8724 | } | |
8725 | ||
8726 | if ((features & NETIF_F_TSO6) && !(features & NETIF_F_HW_CSUM) && | |
8727 | !(features & NETIF_F_IPV6_CSUM)) { | |
8728 | netdev_dbg(dev, "Dropping TSO6 features since no CSUM feature.\n"); | |
8729 | features &= ~NETIF_F_TSO6; | |
8730 | } | |
8731 | ||
b1dc497b AD |
8732 | /* TSO with IPv4 ID mangling requires IPv4 TSO be enabled */ |
8733 | if ((features & NETIF_F_TSO_MANGLEID) && !(features & NETIF_F_TSO)) | |
8734 | features &= ~NETIF_F_TSO_MANGLEID; | |
8735 | ||
31d8b9e0 BH |
8736 | /* TSO ECN requires that TSO is present as well. */ |
8737 | if ((features & NETIF_F_ALL_TSO) == NETIF_F_TSO_ECN) | |
8738 | features &= ~NETIF_F_TSO_ECN; | |
8739 | ||
212b573f MM |
8740 | /* Software GSO depends on SG. */ |
8741 | if ((features & NETIF_F_GSO) && !(features & NETIF_F_SG)) { | |
6f404e44 | 8742 | netdev_dbg(dev, "Dropping NETIF_F_GSO since no SG feature.\n"); |
212b573f MM |
8743 | features &= ~NETIF_F_GSO; |
8744 | } | |
8745 | ||
802ab55a AD |
8746 | /* GSO partial features require GSO partial be set */ |
8747 | if ((features & dev->gso_partial_features) && | |
8748 | !(features & NETIF_F_GSO_PARTIAL)) { | |
8749 | netdev_dbg(dev, | |
8750 | "Dropping partially supported GSO features since no GSO partial.\n"); | |
8751 | features &= ~dev->gso_partial_features; | |
8752 | } | |
8753 | ||
fb1f5f79 MC |
8754 | if (!(features & NETIF_F_RXCSUM)) { |
8755 | /* NETIF_F_GRO_HW implies doing RXCSUM since every packet | |
8756 | * successfully merged by hardware must also have the | |
8757 | * checksum verified by hardware. If the user does not | |
8758 | * want to enable RXCSUM, logically, we should disable GRO_HW. | |
8759 | */ | |
8760 | if (features & NETIF_F_GRO_HW) { | |
8761 | netdev_dbg(dev, "Dropping NETIF_F_GRO_HW since no RXCSUM feature.\n"); | |
8762 | features &= ~NETIF_F_GRO_HW; | |
8763 | } | |
8764 | } | |
8765 | ||
de8d5ab2 GP |
8766 | /* LRO/HW-GRO features cannot be combined with RX-FCS */ |
8767 | if (features & NETIF_F_RXFCS) { | |
8768 | if (features & NETIF_F_LRO) { | |
8769 | netdev_dbg(dev, "Dropping LRO feature since RX-FCS is requested.\n"); | |
8770 | features &= ~NETIF_F_LRO; | |
8771 | } | |
8772 | ||
8773 | if (features & NETIF_F_GRO_HW) { | |
8774 | netdev_dbg(dev, "Dropping HW-GRO feature since RX-FCS is requested.\n"); | |
8775 | features &= ~NETIF_F_GRO_HW; | |
8776 | } | |
e6c6a929 GP |
8777 | } |
8778 | ||
77880c06 TT |
8779 | if ((features & NETIF_F_HW_TLS_RX) && !(features & NETIF_F_RXCSUM)) { |
8780 | netdev_dbg(dev, "Dropping TLS RX HW offload feature since no RXCSUM feature.\n"); | |
8781 | features &= ~NETIF_F_HW_TLS_RX; | |
8782 | } | |
8783 | ||
b63365a2 HX |
8784 | return features; |
8785 | } | |
b63365a2 | 8786 | |
6cb6a27c | 8787 | int __netdev_update_features(struct net_device *dev) |
5455c699 | 8788 | { |
fd867d51 | 8789 | struct net_device *upper, *lower; |
c8f44aff | 8790 | netdev_features_t features; |
fd867d51 | 8791 | struct list_head *iter; |
e7868a85 | 8792 | int err = -1; |
5455c699 | 8793 | |
87267485 MM |
8794 | ASSERT_RTNL(); |
8795 | ||
5455c699 MM |
8796 | features = netdev_get_wanted_features(dev); |
8797 | ||
8798 | if (dev->netdev_ops->ndo_fix_features) | |
8799 | features = dev->netdev_ops->ndo_fix_features(dev, features); | |
8800 | ||
8801 | /* driver might be less strict about feature dependencies */ | |
8802 | features = netdev_fix_features(dev, features); | |
8803 | ||
fd867d51 JW |
8804 | /* some features can't be enabled if they're off an an upper device */ |
8805 | netdev_for_each_upper_dev_rcu(dev, upper, iter) | |
8806 | features = netdev_sync_upper_features(dev, upper, features); | |
8807 | ||
5455c699 | 8808 | if (dev->features == features) |
e7868a85 | 8809 | goto sync_lower; |
5455c699 | 8810 | |
c8f44aff MM |
8811 | netdev_dbg(dev, "Features changed: %pNF -> %pNF\n", |
8812 | &dev->features, &features); | |
5455c699 MM |
8813 | |
8814 | if (dev->netdev_ops->ndo_set_features) | |
8815 | err = dev->netdev_ops->ndo_set_features(dev, features); | |
5f8dc33e NA |
8816 | else |
8817 | err = 0; | |
5455c699 | 8818 | |
6cb6a27c | 8819 | if (unlikely(err < 0)) { |
5455c699 | 8820 | netdev_err(dev, |
c8f44aff MM |
8821 | "set_features() failed (%d); wanted %pNF, left %pNF\n", |
8822 | err, &features, &dev->features); | |
17b85d29 NA |
8823 | /* return non-0 since some features might have changed and |
8824 | * it's better to fire a spurious notification than miss it | |
8825 | */ | |
8826 | return -1; | |
6cb6a27c MM |
8827 | } |
8828 | ||
e7868a85 | 8829 | sync_lower: |
fd867d51 JW |
8830 | /* some features must be disabled on lower devices when disabled |
8831 | * on an upper device (think: bonding master or bridge) | |
8832 | */ | |
8833 | netdev_for_each_lower_dev(dev, lower, iter) | |
8834 | netdev_sync_lower_features(dev, lower, features); | |
8835 | ||
ae847f40 SD |
8836 | if (!err) { |
8837 | netdev_features_t diff = features ^ dev->features; | |
8838 | ||
8839 | if (diff & NETIF_F_RX_UDP_TUNNEL_PORT) { | |
8840 | /* udp_tunnel_{get,drop}_rx_info both need | |
8841 | * NETIF_F_RX_UDP_TUNNEL_PORT enabled on the | |
8842 | * device, or they won't do anything. | |
8843 | * Thus we need to update dev->features | |
8844 | * *before* calling udp_tunnel_get_rx_info, | |
8845 | * but *after* calling udp_tunnel_drop_rx_info. | |
8846 | */ | |
8847 | if (features & NETIF_F_RX_UDP_TUNNEL_PORT) { | |
8848 | dev->features = features; | |
8849 | udp_tunnel_get_rx_info(dev); | |
8850 | } else { | |
8851 | udp_tunnel_drop_rx_info(dev); | |
8852 | } | |
8853 | } | |
8854 | ||
9daae9bd GP |
8855 | if (diff & NETIF_F_HW_VLAN_CTAG_FILTER) { |
8856 | if (features & NETIF_F_HW_VLAN_CTAG_FILTER) { | |
8857 | dev->features = features; | |
8858 | err |= vlan_get_rx_ctag_filter_info(dev); | |
8859 | } else { | |
8860 | vlan_drop_rx_ctag_filter_info(dev); | |
8861 | } | |
8862 | } | |
8863 | ||
8864 | if (diff & NETIF_F_HW_VLAN_STAG_FILTER) { | |
8865 | if (features & NETIF_F_HW_VLAN_STAG_FILTER) { | |
8866 | dev->features = features; | |
8867 | err |= vlan_get_rx_stag_filter_info(dev); | |
8868 | } else { | |
8869 | vlan_drop_rx_stag_filter_info(dev); | |
8870 | } | |
8871 | } | |
8872 | ||
6cb6a27c | 8873 | dev->features = features; |
ae847f40 | 8874 | } |
6cb6a27c | 8875 | |
e7868a85 | 8876 | return err < 0 ? 0 : 1; |
6cb6a27c MM |
8877 | } |
8878 | ||
afe12cc8 MM |
8879 | /** |
8880 | * netdev_update_features - recalculate device features | |
8881 | * @dev: the device to check | |
8882 | * | |
8883 | * Recalculate dev->features set and send notifications if it | |
8884 | * has changed. Should be called after driver or hardware dependent | |
8885 | * conditions might have changed that influence the features. | |
8886 | */ | |
6cb6a27c MM |
8887 | void netdev_update_features(struct net_device *dev) |
8888 | { | |
8889 | if (__netdev_update_features(dev)) | |
8890 | netdev_features_change(dev); | |
5455c699 MM |
8891 | } |
8892 | EXPORT_SYMBOL(netdev_update_features); | |
8893 | ||
afe12cc8 MM |
8894 | /** |
8895 | * netdev_change_features - recalculate device features | |
8896 | * @dev: the device to check | |
8897 | * | |
8898 | * Recalculate dev->features set and send notifications even | |
8899 | * if they have not changed. Should be called instead of | |
8900 | * netdev_update_features() if also dev->vlan_features might | |
8901 | * have changed to allow the changes to be propagated to stacked | |
8902 | * VLAN devices. | |
8903 | */ | |
8904 | void netdev_change_features(struct net_device *dev) | |
8905 | { | |
8906 | __netdev_update_features(dev); | |
8907 | netdev_features_change(dev); | |
8908 | } | |
8909 | EXPORT_SYMBOL(netdev_change_features); | |
8910 | ||
fc4a7489 PM |
8911 | /** |
8912 | * netif_stacked_transfer_operstate - transfer operstate | |
8913 | * @rootdev: the root or lower level device to transfer state from | |
8914 | * @dev: the device to transfer operstate to | |
8915 | * | |
8916 | * Transfer operational state from root to device. This is normally | |
8917 | * called when a stacking relationship exists between the root | |
8918 | * device and the device(a leaf device). | |
8919 | */ | |
8920 | void netif_stacked_transfer_operstate(const struct net_device *rootdev, | |
8921 | struct net_device *dev) | |
8922 | { | |
8923 | if (rootdev->operstate == IF_OPER_DORMANT) | |
8924 | netif_dormant_on(dev); | |
8925 | else | |
8926 | netif_dormant_off(dev); | |
8927 | ||
0575c86b ZS |
8928 | if (netif_carrier_ok(rootdev)) |
8929 | netif_carrier_on(dev); | |
8930 | else | |
8931 | netif_carrier_off(dev); | |
fc4a7489 PM |
8932 | } |
8933 | EXPORT_SYMBOL(netif_stacked_transfer_operstate); | |
8934 | ||
1b4bf461 ED |
8935 | static int netif_alloc_rx_queues(struct net_device *dev) |
8936 | { | |
1b4bf461 | 8937 | unsigned int i, count = dev->num_rx_queues; |
bd25fa7b | 8938 | struct netdev_rx_queue *rx; |
10595902 | 8939 | size_t sz = count * sizeof(*rx); |
e817f856 | 8940 | int err = 0; |
1b4bf461 | 8941 | |
bd25fa7b | 8942 | BUG_ON(count < 1); |
1b4bf461 | 8943 | |
dcda9b04 | 8944 | rx = kvzalloc(sz, GFP_KERNEL | __GFP_RETRY_MAYFAIL); |
da6bc57a MH |
8945 | if (!rx) |
8946 | return -ENOMEM; | |
8947 | ||
bd25fa7b TH |
8948 | dev->_rx = rx; |
8949 | ||
e817f856 | 8950 | for (i = 0; i < count; i++) { |
fe822240 | 8951 | rx[i].dev = dev; |
e817f856 JDB |
8952 | |
8953 | /* XDP RX-queue setup */ | |
8954 | err = xdp_rxq_info_reg(&rx[i].xdp_rxq, dev, i); | |
8955 | if (err < 0) | |
8956 | goto err_rxq_info; | |
8957 | } | |
1b4bf461 | 8958 | return 0; |
e817f856 JDB |
8959 | |
8960 | err_rxq_info: | |
8961 | /* Rollback successful reg's and free other resources */ | |
8962 | while (i--) | |
8963 | xdp_rxq_info_unreg(&rx[i].xdp_rxq); | |
141b52a9 | 8964 | kvfree(dev->_rx); |
e817f856 JDB |
8965 | dev->_rx = NULL; |
8966 | return err; | |
8967 | } | |
8968 | ||
8969 | static void netif_free_rx_queues(struct net_device *dev) | |
8970 | { | |
8971 | unsigned int i, count = dev->num_rx_queues; | |
e817f856 JDB |
8972 | |
8973 | /* netif_alloc_rx_queues alloc failed, resources have been unreg'ed */ | |
8974 | if (!dev->_rx) | |
8975 | return; | |
8976 | ||
e817f856 | 8977 | for (i = 0; i < count; i++) |
82aaff2f JK |
8978 | xdp_rxq_info_unreg(&dev->_rx[i].xdp_rxq); |
8979 | ||
8980 | kvfree(dev->_rx); | |
1b4bf461 ED |
8981 | } |
8982 | ||
aa942104 CG |
8983 | static void netdev_init_one_queue(struct net_device *dev, |
8984 | struct netdev_queue *queue, void *_unused) | |
8985 | { | |
8986 | /* Initialize queue lock */ | |
8987 | spin_lock_init(&queue->_xmit_lock); | |
ab92d68f | 8988 | lockdep_set_class(&queue->_xmit_lock, &dev->qdisc_xmit_lock_key); |
aa942104 | 8989 | queue->xmit_lock_owner = -1; |
b236da69 | 8990 | netdev_queue_numa_node_write(queue, NUMA_NO_NODE); |
aa942104 | 8991 | queue->dev = dev; |
114cf580 TH |
8992 | #ifdef CONFIG_BQL |
8993 | dql_init(&queue->dql, HZ); | |
8994 | #endif | |
aa942104 CG |
8995 | } |
8996 | ||
60877a32 ED |
8997 | static void netif_free_tx_queues(struct net_device *dev) |
8998 | { | |
4cb28970 | 8999 | kvfree(dev->_tx); |
60877a32 ED |
9000 | } |
9001 | ||
e6484930 TH |
9002 | static int netif_alloc_netdev_queues(struct net_device *dev) |
9003 | { | |
9004 | unsigned int count = dev->num_tx_queues; | |
9005 | struct netdev_queue *tx; | |
60877a32 | 9006 | size_t sz = count * sizeof(*tx); |
e6484930 | 9007 | |
d339727c ED |
9008 | if (count < 1 || count > 0xffff) |
9009 | return -EINVAL; | |
62b5942a | 9010 | |
dcda9b04 | 9011 | tx = kvzalloc(sz, GFP_KERNEL | __GFP_RETRY_MAYFAIL); |
da6bc57a MH |
9012 | if (!tx) |
9013 | return -ENOMEM; | |
9014 | ||
e6484930 | 9015 | dev->_tx = tx; |
1d24eb48 | 9016 | |
e6484930 TH |
9017 | netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL); |
9018 | spin_lock_init(&dev->tx_global_lock); | |
aa942104 CG |
9019 | |
9020 | return 0; | |
e6484930 TH |
9021 | } |
9022 | ||
a2029240 DV |
9023 | void netif_tx_stop_all_queues(struct net_device *dev) |
9024 | { | |
9025 | unsigned int i; | |
9026 | ||
9027 | for (i = 0; i < dev->num_tx_queues; i++) { | |
9028 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
f4563a75 | 9029 | |
a2029240 DV |
9030 | netif_tx_stop_queue(txq); |
9031 | } | |
9032 | } | |
9033 | EXPORT_SYMBOL(netif_tx_stop_all_queues); | |
9034 | ||
ab92d68f TY |
9035 | static void netdev_register_lockdep_key(struct net_device *dev) |
9036 | { | |
9037 | lockdep_register_key(&dev->qdisc_tx_busylock_key); | |
9038 | lockdep_register_key(&dev->qdisc_running_key); | |
9039 | lockdep_register_key(&dev->qdisc_xmit_lock_key); | |
9040 | lockdep_register_key(&dev->addr_list_lock_key); | |
9041 | } | |
9042 | ||
9043 | static void netdev_unregister_lockdep_key(struct net_device *dev) | |
9044 | { | |
9045 | lockdep_unregister_key(&dev->qdisc_tx_busylock_key); | |
9046 | lockdep_unregister_key(&dev->qdisc_running_key); | |
9047 | lockdep_unregister_key(&dev->qdisc_xmit_lock_key); | |
9048 | lockdep_unregister_key(&dev->addr_list_lock_key); | |
9049 | } | |
9050 | ||
9051 | void netdev_update_lockdep_key(struct net_device *dev) | |
9052 | { | |
ab92d68f | 9053 | lockdep_unregister_key(&dev->addr_list_lock_key); |
ab92d68f TY |
9054 | lockdep_register_key(&dev->addr_list_lock_key); |
9055 | ||
9056 | lockdep_set_class(&dev->addr_list_lock, &dev->addr_list_lock_key); | |
ab92d68f TY |
9057 | } |
9058 | EXPORT_SYMBOL(netdev_update_lockdep_key); | |
9059 | ||
1da177e4 LT |
9060 | /** |
9061 | * register_netdevice - register a network device | |
9062 | * @dev: device to register | |
9063 | * | |
9064 | * Take a completed network device structure and add it to the kernel | |
9065 | * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier | |
9066 | * chain. 0 is returned on success. A negative errno code is returned | |
9067 | * on a failure to set up the device, or if the name is a duplicate. | |
9068 | * | |
9069 | * Callers must hold the rtnl semaphore. You may want | |
9070 | * register_netdev() instead of this. | |
9071 | * | |
9072 | * BUGS: | |
9073 | * The locking appears insufficient to guarantee two parallel registers | |
9074 | * will not get the same name. | |
9075 | */ | |
9076 | ||
9077 | int register_netdevice(struct net_device *dev) | |
9078 | { | |
1da177e4 | 9079 | int ret; |
d314774c | 9080 | struct net *net = dev_net(dev); |
1da177e4 | 9081 | |
e283de3a FF |
9082 | BUILD_BUG_ON(sizeof(netdev_features_t) * BITS_PER_BYTE < |
9083 | NETDEV_FEATURE_COUNT); | |
1da177e4 LT |
9084 | BUG_ON(dev_boot_phase); |
9085 | ASSERT_RTNL(); | |
9086 | ||
b17a7c17 SH |
9087 | might_sleep(); |
9088 | ||
1da177e4 LT |
9089 | /* When net_device's are persistent, this will be fatal. */ |
9090 | BUG_ON(dev->reg_state != NETREG_UNINITIALIZED); | |
d314774c | 9091 | BUG_ON(!net); |
1da177e4 | 9092 | |
f1f28aa3 | 9093 | spin_lock_init(&dev->addr_list_lock); |
ab92d68f | 9094 | lockdep_set_class(&dev->addr_list_lock, &dev->addr_list_lock_key); |
1da177e4 | 9095 | |
828de4f6 | 9096 | ret = dev_get_valid_name(net, dev, dev->name); |
0696c3a8 PP |
9097 | if (ret < 0) |
9098 | goto out; | |
9099 | ||
1da177e4 | 9100 | /* Init, if this function is available */ |
d314774c SH |
9101 | if (dev->netdev_ops->ndo_init) { |
9102 | ret = dev->netdev_ops->ndo_init(dev); | |
1da177e4 LT |
9103 | if (ret) { |
9104 | if (ret > 0) | |
9105 | ret = -EIO; | |
90833aa4 | 9106 | goto out; |
1da177e4 LT |
9107 | } |
9108 | } | |
4ec93edb | 9109 | |
f646968f PM |
9110 | if (((dev->hw_features | dev->features) & |
9111 | NETIF_F_HW_VLAN_CTAG_FILTER) && | |
d2ed273d MM |
9112 | (!dev->netdev_ops->ndo_vlan_rx_add_vid || |
9113 | !dev->netdev_ops->ndo_vlan_rx_kill_vid)) { | |
9114 | netdev_WARN(dev, "Buggy VLAN acceleration in driver!\n"); | |
9115 | ret = -EINVAL; | |
9116 | goto err_uninit; | |
9117 | } | |
9118 | ||
9c7dafbf PE |
9119 | ret = -EBUSY; |
9120 | if (!dev->ifindex) | |
9121 | dev->ifindex = dev_new_index(net); | |
9122 | else if (__dev_get_by_index(net, dev->ifindex)) | |
9123 | goto err_uninit; | |
9124 | ||
5455c699 MM |
9125 | /* Transfer changeable features to wanted_features and enable |
9126 | * software offloads (GSO and GRO). | |
9127 | */ | |
9128 | dev->hw_features |= NETIF_F_SOFT_FEATURES; | |
14d1232f | 9129 | dev->features |= NETIF_F_SOFT_FEATURES; |
d764a122 SD |
9130 | |
9131 | if (dev->netdev_ops->ndo_udp_tunnel_add) { | |
9132 | dev->features |= NETIF_F_RX_UDP_TUNNEL_PORT; | |
9133 | dev->hw_features |= NETIF_F_RX_UDP_TUNNEL_PORT; | |
9134 | } | |
9135 | ||
14d1232f | 9136 | dev->wanted_features = dev->features & dev->hw_features; |
1da177e4 | 9137 | |
cbc53e08 | 9138 | if (!(dev->flags & IFF_LOOPBACK)) |
34324dc2 | 9139 | dev->hw_features |= NETIF_F_NOCACHE_COPY; |
cbc53e08 | 9140 | |
7f348a60 AD |
9141 | /* If IPv4 TCP segmentation offload is supported we should also |
9142 | * allow the device to enable segmenting the frame with the option | |
9143 | * of ignoring a static IP ID value. This doesn't enable the | |
9144 | * feature itself but allows the user to enable it later. | |
9145 | */ | |
cbc53e08 AD |
9146 | if (dev->hw_features & NETIF_F_TSO) |
9147 | dev->hw_features |= NETIF_F_TSO_MANGLEID; | |
7f348a60 AD |
9148 | if (dev->vlan_features & NETIF_F_TSO) |
9149 | dev->vlan_features |= NETIF_F_TSO_MANGLEID; | |
9150 | if (dev->mpls_features & NETIF_F_TSO) | |
9151 | dev->mpls_features |= NETIF_F_TSO_MANGLEID; | |
9152 | if (dev->hw_enc_features & NETIF_F_TSO) | |
9153 | dev->hw_enc_features |= NETIF_F_TSO_MANGLEID; | |
c6e1a0d1 | 9154 | |
1180e7d6 | 9155 | /* Make NETIF_F_HIGHDMA inheritable to VLAN devices. |
16c3ea78 | 9156 | */ |
1180e7d6 | 9157 | dev->vlan_features |= NETIF_F_HIGHDMA; |
16c3ea78 | 9158 | |
ee579677 PS |
9159 | /* Make NETIF_F_SG inheritable to tunnel devices. |
9160 | */ | |
802ab55a | 9161 | dev->hw_enc_features |= NETIF_F_SG | NETIF_F_GSO_PARTIAL; |
ee579677 | 9162 | |
0d89d203 SH |
9163 | /* Make NETIF_F_SG inheritable to MPLS. |
9164 | */ | |
9165 | dev->mpls_features |= NETIF_F_SG; | |
9166 | ||
7ffbe3fd JB |
9167 | ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev); |
9168 | ret = notifier_to_errno(ret); | |
9169 | if (ret) | |
9170 | goto err_uninit; | |
9171 | ||
8b41d188 | 9172 | ret = netdev_register_kobject(dev); |
756a91a4 JH |
9173 | if (ret) { |
9174 | dev->reg_state = NETREG_UNREGISTERED; | |
7ce1b0ed | 9175 | goto err_uninit; |
756a91a4 | 9176 | } |
b17a7c17 SH |
9177 | dev->reg_state = NETREG_REGISTERED; |
9178 | ||
6cb6a27c | 9179 | __netdev_update_features(dev); |
8e9b59b2 | 9180 | |
1da177e4 LT |
9181 | /* |
9182 | * Default initial state at registry is that the | |
9183 | * device is present. | |
9184 | */ | |
9185 | ||
9186 | set_bit(__LINK_STATE_PRESENT, &dev->state); | |
9187 | ||
8f4cccbb BH |
9188 | linkwatch_init_dev(dev); |
9189 | ||
1da177e4 | 9190 | dev_init_scheduler(dev); |
1da177e4 | 9191 | dev_hold(dev); |
ce286d32 | 9192 | list_netdevice(dev); |
7bf23575 | 9193 | add_device_randomness(dev->dev_addr, dev->addr_len); |
1da177e4 | 9194 | |
948b337e JP |
9195 | /* If the device has permanent device address, driver should |
9196 | * set dev_addr and also addr_assign_type should be set to | |
9197 | * NET_ADDR_PERM (default value). | |
9198 | */ | |
9199 | if (dev->addr_assign_type == NET_ADDR_PERM) | |
9200 | memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len); | |
9201 | ||
1da177e4 | 9202 | /* Notify protocols, that a new device appeared. */ |
056925ab | 9203 | ret = call_netdevice_notifiers(NETDEV_REGISTER, dev); |
fcc5a03a | 9204 | ret = notifier_to_errno(ret); |
93ee31f1 DL |
9205 | if (ret) { |
9206 | rollback_registered(dev); | |
10cc514f SAK |
9207 | rcu_barrier(); |
9208 | ||
93ee31f1 | 9209 | dev->reg_state = NETREG_UNREGISTERED; |
b4128ec1 YY |
9210 | /* We should put the kobject that hold in |
9211 | * netdev_unregister_kobject(), otherwise | |
9212 | * the net device cannot be freed when | |
9213 | * driver calls free_netdev(), because the | |
9214 | * kobject is being hold. | |
9215 | */ | |
9216 | kobject_put(&dev->dev.kobj); | |
93ee31f1 | 9217 | } |
d90a909e EB |
9218 | /* |
9219 | * Prevent userspace races by waiting until the network | |
9220 | * device is fully setup before sending notifications. | |
9221 | */ | |
a2835763 PM |
9222 | if (!dev->rtnl_link_ops || |
9223 | dev->rtnl_link_state == RTNL_LINK_INITIALIZED) | |
7f294054 | 9224 | rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL); |
1da177e4 LT |
9225 | |
9226 | out: | |
9227 | return ret; | |
7ce1b0ed HX |
9228 | |
9229 | err_uninit: | |
d314774c SH |
9230 | if (dev->netdev_ops->ndo_uninit) |
9231 | dev->netdev_ops->ndo_uninit(dev); | |
cf124db5 DM |
9232 | if (dev->priv_destructor) |
9233 | dev->priv_destructor(dev); | |
7ce1b0ed | 9234 | goto out; |
1da177e4 | 9235 | } |
d1b19dff | 9236 | EXPORT_SYMBOL(register_netdevice); |
1da177e4 | 9237 | |
937f1ba5 BH |
9238 | /** |
9239 | * init_dummy_netdev - init a dummy network device for NAPI | |
9240 | * @dev: device to init | |
9241 | * | |
9242 | * This takes a network device structure and initialize the minimum | |
9243 | * amount of fields so it can be used to schedule NAPI polls without | |
9244 | * registering a full blown interface. This is to be used by drivers | |
9245 | * that need to tie several hardware interfaces to a single NAPI | |
9246 | * poll scheduler due to HW limitations. | |
9247 | */ | |
9248 | int init_dummy_netdev(struct net_device *dev) | |
9249 | { | |
9250 | /* Clear everything. Note we don't initialize spinlocks | |
9251 | * are they aren't supposed to be taken by any of the | |
9252 | * NAPI code and this dummy netdev is supposed to be | |
9253 | * only ever used for NAPI polls | |
9254 | */ | |
9255 | memset(dev, 0, sizeof(struct net_device)); | |
9256 | ||
9257 | /* make sure we BUG if trying to hit standard | |
9258 | * register/unregister code path | |
9259 | */ | |
9260 | dev->reg_state = NETREG_DUMMY; | |
9261 | ||
937f1ba5 BH |
9262 | /* NAPI wants this */ |
9263 | INIT_LIST_HEAD(&dev->napi_list); | |
9264 | ||
9265 | /* a dummy interface is started by default */ | |
9266 | set_bit(__LINK_STATE_PRESENT, &dev->state); | |
9267 | set_bit(__LINK_STATE_START, &dev->state); | |
9268 | ||
35edfdc7 JE |
9269 | /* napi_busy_loop stats accounting wants this */ |
9270 | dev_net_set(dev, &init_net); | |
9271 | ||
29b4433d ED |
9272 | /* Note : We dont allocate pcpu_refcnt for dummy devices, |
9273 | * because users of this 'device' dont need to change | |
9274 | * its refcount. | |
9275 | */ | |
9276 | ||
937f1ba5 BH |
9277 | return 0; |
9278 | } | |
9279 | EXPORT_SYMBOL_GPL(init_dummy_netdev); | |
9280 | ||
9281 | ||
1da177e4 LT |
9282 | /** |
9283 | * register_netdev - register a network device | |
9284 | * @dev: device to register | |
9285 | * | |
9286 | * Take a completed network device structure and add it to the kernel | |
9287 | * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier | |
9288 | * chain. 0 is returned on success. A negative errno code is returned | |
9289 | * on a failure to set up the device, or if the name is a duplicate. | |
9290 | * | |
38b4da38 | 9291 | * This is a wrapper around register_netdevice that takes the rtnl semaphore |
1da177e4 LT |
9292 | * and expands the device name if you passed a format string to |
9293 | * alloc_netdev. | |
9294 | */ | |
9295 | int register_netdev(struct net_device *dev) | |
9296 | { | |
9297 | int err; | |
9298 | ||
b0f3debc KT |
9299 | if (rtnl_lock_killable()) |
9300 | return -EINTR; | |
1da177e4 | 9301 | err = register_netdevice(dev); |
1da177e4 LT |
9302 | rtnl_unlock(); |
9303 | return err; | |
9304 | } | |
9305 | EXPORT_SYMBOL(register_netdev); | |
9306 | ||
29b4433d ED |
9307 | int netdev_refcnt_read(const struct net_device *dev) |
9308 | { | |
9309 | int i, refcnt = 0; | |
9310 | ||
9311 | for_each_possible_cpu(i) | |
9312 | refcnt += *per_cpu_ptr(dev->pcpu_refcnt, i); | |
9313 | return refcnt; | |
9314 | } | |
9315 | EXPORT_SYMBOL(netdev_refcnt_read); | |
9316 | ||
2c53040f | 9317 | /** |
1da177e4 | 9318 | * netdev_wait_allrefs - wait until all references are gone. |
3de7a37b | 9319 | * @dev: target net_device |
1da177e4 LT |
9320 | * |
9321 | * This is called when unregistering network devices. | |
9322 | * | |
9323 | * Any protocol or device that holds a reference should register | |
9324 | * for netdevice notification, and cleanup and put back the | |
9325 | * reference if they receive an UNREGISTER event. | |
9326 | * We can get stuck here if buggy protocols don't correctly | |
4ec93edb | 9327 | * call dev_put. |
1da177e4 LT |
9328 | */ |
9329 | static void netdev_wait_allrefs(struct net_device *dev) | |
9330 | { | |
9331 | unsigned long rebroadcast_time, warning_time; | |
29b4433d | 9332 | int refcnt; |
1da177e4 | 9333 | |
e014debe ED |
9334 | linkwatch_forget_dev(dev); |
9335 | ||
1da177e4 | 9336 | rebroadcast_time = warning_time = jiffies; |
29b4433d ED |
9337 | refcnt = netdev_refcnt_read(dev); |
9338 | ||
9339 | while (refcnt != 0) { | |
1da177e4 | 9340 | if (time_after(jiffies, rebroadcast_time + 1 * HZ)) { |
6756ae4b | 9341 | rtnl_lock(); |
1da177e4 LT |
9342 | |
9343 | /* Rebroadcast unregister notification */ | |
056925ab | 9344 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); |
1da177e4 | 9345 | |
748e2d93 | 9346 | __rtnl_unlock(); |
0115e8e3 | 9347 | rcu_barrier(); |
748e2d93 ED |
9348 | rtnl_lock(); |
9349 | ||
1da177e4 LT |
9350 | if (test_bit(__LINK_STATE_LINKWATCH_PENDING, |
9351 | &dev->state)) { | |
9352 | /* We must not have linkwatch events | |
9353 | * pending on unregister. If this | |
9354 | * happens, we simply run the queue | |
9355 | * unscheduled, resulting in a noop | |
9356 | * for this device. | |
9357 | */ | |
9358 | linkwatch_run_queue(); | |
9359 | } | |
9360 | ||
6756ae4b | 9361 | __rtnl_unlock(); |
1da177e4 LT |
9362 | |
9363 | rebroadcast_time = jiffies; | |
9364 | } | |
9365 | ||
9366 | msleep(250); | |
9367 | ||
29b4433d ED |
9368 | refcnt = netdev_refcnt_read(dev); |
9369 | ||
d7c04b05 | 9370 | if (refcnt && time_after(jiffies, warning_time + 10 * HZ)) { |
7b6cd1ce JP |
9371 | pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n", |
9372 | dev->name, refcnt); | |
1da177e4 LT |
9373 | warning_time = jiffies; |
9374 | } | |
9375 | } | |
9376 | } | |
9377 | ||
9378 | /* The sequence is: | |
9379 | * | |
9380 | * rtnl_lock(); | |
9381 | * ... | |
9382 | * register_netdevice(x1); | |
9383 | * register_netdevice(x2); | |
9384 | * ... | |
9385 | * unregister_netdevice(y1); | |
9386 | * unregister_netdevice(y2); | |
9387 | * ... | |
9388 | * rtnl_unlock(); | |
9389 | * free_netdev(y1); | |
9390 | * free_netdev(y2); | |
9391 | * | |
58ec3b4d | 9392 | * We are invoked by rtnl_unlock(). |
1da177e4 | 9393 | * This allows us to deal with problems: |
b17a7c17 | 9394 | * 1) We can delete sysfs objects which invoke hotplug |
1da177e4 LT |
9395 | * without deadlocking with linkwatch via keventd. |
9396 | * 2) Since we run with the RTNL semaphore not held, we can sleep | |
9397 | * safely in order to wait for the netdev refcnt to drop to zero. | |
58ec3b4d HX |
9398 | * |
9399 | * We must not return until all unregister events added during | |
9400 | * the interval the lock was held have been completed. | |
1da177e4 | 9401 | */ |
1da177e4 LT |
9402 | void netdev_run_todo(void) |
9403 | { | |
626ab0e6 | 9404 | struct list_head list; |
1da177e4 | 9405 | |
1da177e4 | 9406 | /* Snapshot list, allow later requests */ |
626ab0e6 | 9407 | list_replace_init(&net_todo_list, &list); |
58ec3b4d HX |
9408 | |
9409 | __rtnl_unlock(); | |
626ab0e6 | 9410 | |
0115e8e3 ED |
9411 | |
9412 | /* Wait for rcu callbacks to finish before next phase */ | |
850a545b EB |
9413 | if (!list_empty(&list)) |
9414 | rcu_barrier(); | |
9415 | ||
1da177e4 LT |
9416 | while (!list_empty(&list)) { |
9417 | struct net_device *dev | |
e5e26d75 | 9418 | = list_first_entry(&list, struct net_device, todo_list); |
1da177e4 LT |
9419 | list_del(&dev->todo_list); |
9420 | ||
b17a7c17 | 9421 | if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) { |
7b6cd1ce | 9422 | pr_err("network todo '%s' but state %d\n", |
b17a7c17 SH |
9423 | dev->name, dev->reg_state); |
9424 | dump_stack(); | |
9425 | continue; | |
9426 | } | |
1da177e4 | 9427 | |
b17a7c17 | 9428 | dev->reg_state = NETREG_UNREGISTERED; |
1da177e4 | 9429 | |
b17a7c17 | 9430 | netdev_wait_allrefs(dev); |
1da177e4 | 9431 | |
b17a7c17 | 9432 | /* paranoia */ |
29b4433d | 9433 | BUG_ON(netdev_refcnt_read(dev)); |
7866a621 SN |
9434 | BUG_ON(!list_empty(&dev->ptype_all)); |
9435 | BUG_ON(!list_empty(&dev->ptype_specific)); | |
33d480ce ED |
9436 | WARN_ON(rcu_access_pointer(dev->ip_ptr)); |
9437 | WARN_ON(rcu_access_pointer(dev->ip6_ptr)); | |
330c7272 | 9438 | #if IS_ENABLED(CONFIG_DECNET) |
547b792c | 9439 | WARN_ON(dev->dn_ptr); |
330c7272 | 9440 | #endif |
cf124db5 DM |
9441 | if (dev->priv_destructor) |
9442 | dev->priv_destructor(dev); | |
9443 | if (dev->needs_free_netdev) | |
9444 | free_netdev(dev); | |
9093bbb2 | 9445 | |
50624c93 EB |
9446 | /* Report a network device has been unregistered */ |
9447 | rtnl_lock(); | |
9448 | dev_net(dev)->dev_unreg_count--; | |
9449 | __rtnl_unlock(); | |
9450 | wake_up(&netdev_unregistering_wq); | |
9451 | ||
9093bbb2 SH |
9452 | /* Free network device */ |
9453 | kobject_put(&dev->dev.kobj); | |
1da177e4 | 9454 | } |
1da177e4 LT |
9455 | } |
9456 | ||
9256645a JW |
9457 | /* Convert net_device_stats to rtnl_link_stats64. rtnl_link_stats64 has |
9458 | * all the same fields in the same order as net_device_stats, with only | |
9459 | * the type differing, but rtnl_link_stats64 may have additional fields | |
9460 | * at the end for newer counters. | |
3cfde79c | 9461 | */ |
77a1abf5 ED |
9462 | void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64, |
9463 | const struct net_device_stats *netdev_stats) | |
3cfde79c BH |
9464 | { |
9465 | #if BITS_PER_LONG == 64 | |
9256645a | 9466 | BUILD_BUG_ON(sizeof(*stats64) < sizeof(*netdev_stats)); |
9af9959e | 9467 | memcpy(stats64, netdev_stats, sizeof(*netdev_stats)); |
9256645a JW |
9468 | /* zero out counters that only exist in rtnl_link_stats64 */ |
9469 | memset((char *)stats64 + sizeof(*netdev_stats), 0, | |
9470 | sizeof(*stats64) - sizeof(*netdev_stats)); | |
3cfde79c | 9471 | #else |
9256645a | 9472 | size_t i, n = sizeof(*netdev_stats) / sizeof(unsigned long); |
3cfde79c BH |
9473 | const unsigned long *src = (const unsigned long *)netdev_stats; |
9474 | u64 *dst = (u64 *)stats64; | |
9475 | ||
9256645a | 9476 | BUILD_BUG_ON(n > sizeof(*stats64) / sizeof(u64)); |
3cfde79c BH |
9477 | for (i = 0; i < n; i++) |
9478 | dst[i] = src[i]; | |
9256645a JW |
9479 | /* zero out counters that only exist in rtnl_link_stats64 */ |
9480 | memset((char *)stats64 + n * sizeof(u64), 0, | |
9481 | sizeof(*stats64) - n * sizeof(u64)); | |
3cfde79c BH |
9482 | #endif |
9483 | } | |
77a1abf5 | 9484 | EXPORT_SYMBOL(netdev_stats_to_stats64); |
3cfde79c | 9485 | |
eeda3fd6 SH |
9486 | /** |
9487 | * dev_get_stats - get network device statistics | |
9488 | * @dev: device to get statistics from | |
28172739 | 9489 | * @storage: place to store stats |
eeda3fd6 | 9490 | * |
d7753516 BH |
9491 | * Get network statistics from device. Return @storage. |
9492 | * The device driver may provide its own method by setting | |
9493 | * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats; | |
9494 | * otherwise the internal statistics structure is used. | |
eeda3fd6 | 9495 | */ |
d7753516 BH |
9496 | struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev, |
9497 | struct rtnl_link_stats64 *storage) | |
7004bf25 | 9498 | { |
eeda3fd6 SH |
9499 | const struct net_device_ops *ops = dev->netdev_ops; |
9500 | ||
28172739 ED |
9501 | if (ops->ndo_get_stats64) { |
9502 | memset(storage, 0, sizeof(*storage)); | |
caf586e5 ED |
9503 | ops->ndo_get_stats64(dev, storage); |
9504 | } else if (ops->ndo_get_stats) { | |
3cfde79c | 9505 | netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev)); |
caf586e5 ED |
9506 | } else { |
9507 | netdev_stats_to_stats64(storage, &dev->stats); | |
28172739 | 9508 | } |
6f64ec74 ED |
9509 | storage->rx_dropped += (unsigned long)atomic_long_read(&dev->rx_dropped); |
9510 | storage->tx_dropped += (unsigned long)atomic_long_read(&dev->tx_dropped); | |
9511 | storage->rx_nohandler += (unsigned long)atomic_long_read(&dev->rx_nohandler); | |
28172739 | 9512 | return storage; |
c45d286e | 9513 | } |
eeda3fd6 | 9514 | EXPORT_SYMBOL(dev_get_stats); |
c45d286e | 9515 | |
24824a09 | 9516 | struct netdev_queue *dev_ingress_queue_create(struct net_device *dev) |
dc2b4847 | 9517 | { |
24824a09 | 9518 | struct netdev_queue *queue = dev_ingress_queue(dev); |
dc2b4847 | 9519 | |
24824a09 ED |
9520 | #ifdef CONFIG_NET_CLS_ACT |
9521 | if (queue) | |
9522 | return queue; | |
9523 | queue = kzalloc(sizeof(*queue), GFP_KERNEL); | |
9524 | if (!queue) | |
9525 | return NULL; | |
9526 | netdev_init_one_queue(dev, queue, NULL); | |
2ce1ee17 | 9527 | RCU_INIT_POINTER(queue->qdisc, &noop_qdisc); |
24824a09 ED |
9528 | queue->qdisc_sleeping = &noop_qdisc; |
9529 | rcu_assign_pointer(dev->ingress_queue, queue); | |
9530 | #endif | |
9531 | return queue; | |
bb949fbd DM |
9532 | } |
9533 | ||
2c60db03 ED |
9534 | static const struct ethtool_ops default_ethtool_ops; |
9535 | ||
d07d7507 SG |
9536 | void netdev_set_default_ethtool_ops(struct net_device *dev, |
9537 | const struct ethtool_ops *ops) | |
9538 | { | |
9539 | if (dev->ethtool_ops == &default_ethtool_ops) | |
9540 | dev->ethtool_ops = ops; | |
9541 | } | |
9542 | EXPORT_SYMBOL_GPL(netdev_set_default_ethtool_ops); | |
9543 | ||
74d332c1 ED |
9544 | void netdev_freemem(struct net_device *dev) |
9545 | { | |
9546 | char *addr = (char *)dev - dev->padded; | |
9547 | ||
4cb28970 | 9548 | kvfree(addr); |
74d332c1 ED |
9549 | } |
9550 | ||
1da177e4 | 9551 | /** |
722c9a0c | 9552 | * alloc_netdev_mqs - allocate network device |
9553 | * @sizeof_priv: size of private data to allocate space for | |
9554 | * @name: device name format string | |
9555 | * @name_assign_type: origin of device name | |
9556 | * @setup: callback to initialize device | |
9557 | * @txqs: the number of TX subqueues to allocate | |
9558 | * @rxqs: the number of RX subqueues to allocate | |
9559 | * | |
9560 | * Allocates a struct net_device with private data area for driver use | |
9561 | * and performs basic initialization. Also allocates subqueue structs | |
9562 | * for each queue on the device. | |
1da177e4 | 9563 | */ |
36909ea4 | 9564 | struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name, |
c835a677 | 9565 | unsigned char name_assign_type, |
36909ea4 TH |
9566 | void (*setup)(struct net_device *), |
9567 | unsigned int txqs, unsigned int rxqs) | |
1da177e4 | 9568 | { |
1da177e4 | 9569 | struct net_device *dev; |
52a59bd5 | 9570 | unsigned int alloc_size; |
1ce8e7b5 | 9571 | struct net_device *p; |
1da177e4 | 9572 | |
b6fe17d6 SH |
9573 | BUG_ON(strlen(name) >= sizeof(dev->name)); |
9574 | ||
36909ea4 | 9575 | if (txqs < 1) { |
7b6cd1ce | 9576 | pr_err("alloc_netdev: Unable to allocate device with zero queues\n"); |
55513fb4 TH |
9577 | return NULL; |
9578 | } | |
9579 | ||
36909ea4 | 9580 | if (rxqs < 1) { |
7b6cd1ce | 9581 | pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n"); |
36909ea4 TH |
9582 | return NULL; |
9583 | } | |
36909ea4 | 9584 | |
fd2ea0a7 | 9585 | alloc_size = sizeof(struct net_device); |
d1643d24 AD |
9586 | if (sizeof_priv) { |
9587 | /* ensure 32-byte alignment of private area */ | |
1ce8e7b5 | 9588 | alloc_size = ALIGN(alloc_size, NETDEV_ALIGN); |
d1643d24 AD |
9589 | alloc_size += sizeof_priv; |
9590 | } | |
9591 | /* ensure 32-byte alignment of whole construct */ | |
1ce8e7b5 | 9592 | alloc_size += NETDEV_ALIGN - 1; |
1da177e4 | 9593 | |
dcda9b04 | 9594 | p = kvzalloc(alloc_size, GFP_KERNEL | __GFP_RETRY_MAYFAIL); |
62b5942a | 9595 | if (!p) |
1da177e4 | 9596 | return NULL; |
1da177e4 | 9597 | |
1ce8e7b5 | 9598 | dev = PTR_ALIGN(p, NETDEV_ALIGN); |
1da177e4 | 9599 | dev->padded = (char *)dev - (char *)p; |
ab9c73cc | 9600 | |
29b4433d ED |
9601 | dev->pcpu_refcnt = alloc_percpu(int); |
9602 | if (!dev->pcpu_refcnt) | |
74d332c1 | 9603 | goto free_dev; |
ab9c73cc | 9604 | |
ab9c73cc | 9605 | if (dev_addr_init(dev)) |
29b4433d | 9606 | goto free_pcpu; |
ab9c73cc | 9607 | |
22bedad3 | 9608 | dev_mc_init(dev); |
a748ee24 | 9609 | dev_uc_init(dev); |
ccffad25 | 9610 | |
c346dca1 | 9611 | dev_net_set(dev, &init_net); |
1da177e4 | 9612 | |
ab92d68f TY |
9613 | netdev_register_lockdep_key(dev); |
9614 | ||
8d3bdbd5 | 9615 | dev->gso_max_size = GSO_MAX_SIZE; |
30b678d8 | 9616 | dev->gso_max_segs = GSO_MAX_SEGS; |
5343da4c TY |
9617 | dev->upper_level = 1; |
9618 | dev->lower_level = 1; | |
8d3bdbd5 | 9619 | |
8d3bdbd5 DM |
9620 | INIT_LIST_HEAD(&dev->napi_list); |
9621 | INIT_LIST_HEAD(&dev->unreg_list); | |
5cde2829 | 9622 | INIT_LIST_HEAD(&dev->close_list); |
8d3bdbd5 | 9623 | INIT_LIST_HEAD(&dev->link_watch_list); |
2f268f12 VF |
9624 | INIT_LIST_HEAD(&dev->adj_list.upper); |
9625 | INIT_LIST_HEAD(&dev->adj_list.lower); | |
7866a621 SN |
9626 | INIT_LIST_HEAD(&dev->ptype_all); |
9627 | INIT_LIST_HEAD(&dev->ptype_specific); | |
59cc1f61 JK |
9628 | #ifdef CONFIG_NET_SCHED |
9629 | hash_init(dev->qdisc_hash); | |
9630 | #endif | |
02875878 | 9631 | dev->priv_flags = IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM; |
8d3bdbd5 DM |
9632 | setup(dev); |
9633 | ||
a813104d | 9634 | if (!dev->tx_queue_len) { |
f84bb1ea | 9635 | dev->priv_flags |= IFF_NO_QUEUE; |
11597084 | 9636 | dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN; |
a813104d | 9637 | } |
906470c1 | 9638 | |
36909ea4 TH |
9639 | dev->num_tx_queues = txqs; |
9640 | dev->real_num_tx_queues = txqs; | |
ed9af2e8 | 9641 | if (netif_alloc_netdev_queues(dev)) |
8d3bdbd5 | 9642 | goto free_all; |
e8a0464c | 9643 | |
36909ea4 TH |
9644 | dev->num_rx_queues = rxqs; |
9645 | dev->real_num_rx_queues = rxqs; | |
fe822240 | 9646 | if (netif_alloc_rx_queues(dev)) |
8d3bdbd5 | 9647 | goto free_all; |
0a9627f2 | 9648 | |
1da177e4 | 9649 | strcpy(dev->name, name); |
c835a677 | 9650 | dev->name_assign_type = name_assign_type; |
cbda10fa | 9651 | dev->group = INIT_NETDEV_GROUP; |
2c60db03 ED |
9652 | if (!dev->ethtool_ops) |
9653 | dev->ethtool_ops = &default_ethtool_ops; | |
e687ad60 PN |
9654 | |
9655 | nf_hook_ingress_init(dev); | |
9656 | ||
1da177e4 | 9657 | return dev; |
ab9c73cc | 9658 | |
8d3bdbd5 DM |
9659 | free_all: |
9660 | free_netdev(dev); | |
9661 | return NULL; | |
9662 | ||
29b4433d ED |
9663 | free_pcpu: |
9664 | free_percpu(dev->pcpu_refcnt); | |
74d332c1 ED |
9665 | free_dev: |
9666 | netdev_freemem(dev); | |
ab9c73cc | 9667 | return NULL; |
1da177e4 | 9668 | } |
36909ea4 | 9669 | EXPORT_SYMBOL(alloc_netdev_mqs); |
1da177e4 LT |
9670 | |
9671 | /** | |
722c9a0c | 9672 | * free_netdev - free network device |
9673 | * @dev: device | |
1da177e4 | 9674 | * |
722c9a0c | 9675 | * This function does the last stage of destroying an allocated device |
9676 | * interface. The reference to the device object is released. If this | |
9677 | * is the last reference then it will be freed.Must be called in process | |
9678 | * context. | |
1da177e4 LT |
9679 | */ |
9680 | void free_netdev(struct net_device *dev) | |
9681 | { | |
d565b0a1 HX |
9682 | struct napi_struct *p, *n; |
9683 | ||
93d05d4a | 9684 | might_sleep(); |
60877a32 | 9685 | netif_free_tx_queues(dev); |
e817f856 | 9686 | netif_free_rx_queues(dev); |
e8a0464c | 9687 | |
33d480ce | 9688 | kfree(rcu_dereference_protected(dev->ingress_queue, 1)); |
24824a09 | 9689 | |
f001fde5 JP |
9690 | /* Flush device addresses */ |
9691 | dev_addr_flush(dev); | |
9692 | ||
d565b0a1 HX |
9693 | list_for_each_entry_safe(p, n, &dev->napi_list, dev_list) |
9694 | netif_napi_del(p); | |
9695 | ||
29b4433d ED |
9696 | free_percpu(dev->pcpu_refcnt); |
9697 | dev->pcpu_refcnt = NULL; | |
9698 | ||
ab92d68f TY |
9699 | netdev_unregister_lockdep_key(dev); |
9700 | ||
3041a069 | 9701 | /* Compatibility with error handling in drivers */ |
1da177e4 | 9702 | if (dev->reg_state == NETREG_UNINITIALIZED) { |
74d332c1 | 9703 | netdev_freemem(dev); |
1da177e4 LT |
9704 | return; |
9705 | } | |
9706 | ||
9707 | BUG_ON(dev->reg_state != NETREG_UNREGISTERED); | |
9708 | dev->reg_state = NETREG_RELEASED; | |
9709 | ||
43cb76d9 GKH |
9710 | /* will free via device release */ |
9711 | put_device(&dev->dev); | |
1da177e4 | 9712 | } |
d1b19dff | 9713 | EXPORT_SYMBOL(free_netdev); |
4ec93edb | 9714 | |
f0db275a SH |
9715 | /** |
9716 | * synchronize_net - Synchronize with packet receive processing | |
9717 | * | |
9718 | * Wait for packets currently being received to be done. | |
9719 | * Does not block later packets from starting. | |
9720 | */ | |
4ec93edb | 9721 | void synchronize_net(void) |
1da177e4 LT |
9722 | { |
9723 | might_sleep(); | |
be3fc413 ED |
9724 | if (rtnl_is_locked()) |
9725 | synchronize_rcu_expedited(); | |
9726 | else | |
9727 | synchronize_rcu(); | |
1da177e4 | 9728 | } |
d1b19dff | 9729 | EXPORT_SYMBOL(synchronize_net); |
1da177e4 LT |
9730 | |
9731 | /** | |
44a0873d | 9732 | * unregister_netdevice_queue - remove device from the kernel |
1da177e4 | 9733 | * @dev: device |
44a0873d | 9734 | * @head: list |
6ebfbc06 | 9735 | * |
1da177e4 | 9736 | * This function shuts down a device interface and removes it |
d59b54b1 | 9737 | * from the kernel tables. |
44a0873d | 9738 | * If head not NULL, device is queued to be unregistered later. |
1da177e4 LT |
9739 | * |
9740 | * Callers must hold the rtnl semaphore. You may want | |
9741 | * unregister_netdev() instead of this. | |
9742 | */ | |
9743 | ||
44a0873d | 9744 | void unregister_netdevice_queue(struct net_device *dev, struct list_head *head) |
1da177e4 | 9745 | { |
a6620712 HX |
9746 | ASSERT_RTNL(); |
9747 | ||
44a0873d | 9748 | if (head) { |
9fdce099 | 9749 | list_move_tail(&dev->unreg_list, head); |
44a0873d ED |
9750 | } else { |
9751 | rollback_registered(dev); | |
9752 | /* Finish processing unregister after unlock */ | |
9753 | net_set_todo(dev); | |
9754 | } | |
1da177e4 | 9755 | } |
44a0873d | 9756 | EXPORT_SYMBOL(unregister_netdevice_queue); |
1da177e4 | 9757 | |
9b5e383c ED |
9758 | /** |
9759 | * unregister_netdevice_many - unregister many devices | |
9760 | * @head: list of devices | |
87757a91 ED |
9761 | * |
9762 | * Note: As most callers use a stack allocated list_head, | |
9763 | * we force a list_del() to make sure stack wont be corrupted later. | |
9b5e383c ED |
9764 | */ |
9765 | void unregister_netdevice_many(struct list_head *head) | |
9766 | { | |
9767 | struct net_device *dev; | |
9768 | ||
9769 | if (!list_empty(head)) { | |
9770 | rollback_registered_many(head); | |
9771 | list_for_each_entry(dev, head, unreg_list) | |
9772 | net_set_todo(dev); | |
87757a91 | 9773 | list_del(head); |
9b5e383c ED |
9774 | } |
9775 | } | |
63c8099d | 9776 | EXPORT_SYMBOL(unregister_netdevice_many); |
9b5e383c | 9777 | |
1da177e4 LT |
9778 | /** |
9779 | * unregister_netdev - remove device from the kernel | |
9780 | * @dev: device | |
9781 | * | |
9782 | * This function shuts down a device interface and removes it | |
d59b54b1 | 9783 | * from the kernel tables. |
1da177e4 LT |
9784 | * |
9785 | * This is just a wrapper for unregister_netdevice that takes | |
9786 | * the rtnl semaphore. In general you want to use this and not | |
9787 | * unregister_netdevice. | |
9788 | */ | |
9789 | void unregister_netdev(struct net_device *dev) | |
9790 | { | |
9791 | rtnl_lock(); | |
9792 | unregister_netdevice(dev); | |
9793 | rtnl_unlock(); | |
9794 | } | |
1da177e4 LT |
9795 | EXPORT_SYMBOL(unregister_netdev); |
9796 | ||
ce286d32 EB |
9797 | /** |
9798 | * dev_change_net_namespace - move device to different nethost namespace | |
9799 | * @dev: device | |
9800 | * @net: network namespace | |
9801 | * @pat: If not NULL name pattern to try if the current device name | |
9802 | * is already taken in the destination network namespace. | |
9803 | * | |
9804 | * This function shuts down a device interface and moves it | |
9805 | * to a new network namespace. On success 0 is returned, on | |
9806 | * a failure a netagive errno code is returned. | |
9807 | * | |
9808 | * Callers must hold the rtnl semaphore. | |
9809 | */ | |
9810 | ||
9811 | int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat) | |
9812 | { | |
e61a8ced | 9813 | struct net *net_old = dev_net(dev); |
38e01b30 | 9814 | int err, new_nsid, new_ifindex; |
ce286d32 EB |
9815 | |
9816 | ASSERT_RTNL(); | |
9817 | ||
9818 | /* Don't allow namespace local devices to be moved. */ | |
9819 | err = -EINVAL; | |
9820 | if (dev->features & NETIF_F_NETNS_LOCAL) | |
9821 | goto out; | |
9822 | ||
9823 | /* Ensure the device has been registrered */ | |
ce286d32 EB |
9824 | if (dev->reg_state != NETREG_REGISTERED) |
9825 | goto out; | |
9826 | ||
9827 | /* Get out if there is nothing todo */ | |
9828 | err = 0; | |
e61a8ced | 9829 | if (net_eq(net_old, net)) |
ce286d32 EB |
9830 | goto out; |
9831 | ||
9832 | /* Pick the destination device name, and ensure | |
9833 | * we can use it in the destination network namespace. | |
9834 | */ | |
9835 | err = -EEXIST; | |
d9031024 | 9836 | if (__dev_get_by_name(net, dev->name)) { |
ce286d32 EB |
9837 | /* We get here if we can't use the current device name */ |
9838 | if (!pat) | |
9839 | goto out; | |
7892bd08 LR |
9840 | err = dev_get_valid_name(net, dev, pat); |
9841 | if (err < 0) | |
ce286d32 EB |
9842 | goto out; |
9843 | } | |
9844 | ||
9845 | /* | |
9846 | * And now a mini version of register_netdevice unregister_netdevice. | |
9847 | */ | |
9848 | ||
9849 | /* If device is running close it first. */ | |
9b772652 | 9850 | dev_close(dev); |
ce286d32 EB |
9851 | |
9852 | /* And unlink it from device chain */ | |
ce286d32 EB |
9853 | unlist_netdevice(dev); |
9854 | ||
9855 | synchronize_net(); | |
9856 | ||
9857 | /* Shutdown queueing discipline. */ | |
9858 | dev_shutdown(dev); | |
9859 | ||
9860 | /* Notify protocols, that we are about to destroy | |
eb13da1a | 9861 | * this device. They should clean all the things. |
9862 | * | |
9863 | * Note that dev->reg_state stays at NETREG_REGISTERED. | |
9864 | * This is wanted because this way 8021q and macvlan know | |
9865 | * the device is just moving and can keep their slaves up. | |
9866 | */ | |
ce286d32 | 9867 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); |
6549dd43 | 9868 | rcu_barrier(); |
38e01b30 | 9869 | |
d4e4fdf9 | 9870 | new_nsid = peernet2id_alloc(dev_net(dev), net, GFP_KERNEL); |
38e01b30 ND |
9871 | /* If there is an ifindex conflict assign a new one */ |
9872 | if (__dev_get_by_index(net, dev->ifindex)) | |
9873 | new_ifindex = dev_new_index(net); | |
9874 | else | |
9875 | new_ifindex = dev->ifindex; | |
9876 | ||
9877 | rtmsg_ifinfo_newnet(RTM_DELLINK, dev, ~0U, GFP_KERNEL, &new_nsid, | |
9878 | new_ifindex); | |
ce286d32 EB |
9879 | |
9880 | /* | |
9881 | * Flush the unicast and multicast chains | |
9882 | */ | |
a748ee24 | 9883 | dev_uc_flush(dev); |
22bedad3 | 9884 | dev_mc_flush(dev); |
ce286d32 | 9885 | |
4e66ae2e SH |
9886 | /* Send a netdev-removed uevent to the old namespace */ |
9887 | kobject_uevent(&dev->dev.kobj, KOBJ_REMOVE); | |
4c75431a | 9888 | netdev_adjacent_del_links(dev); |
4e66ae2e | 9889 | |
ce286d32 | 9890 | /* Actually switch the network namespace */ |
c346dca1 | 9891 | dev_net_set(dev, net); |
38e01b30 | 9892 | dev->ifindex = new_ifindex; |
ce286d32 | 9893 | |
4e66ae2e SH |
9894 | /* Send a netdev-add uevent to the new namespace */ |
9895 | kobject_uevent(&dev->dev.kobj, KOBJ_ADD); | |
4c75431a | 9896 | netdev_adjacent_add_links(dev); |
4e66ae2e | 9897 | |
8b41d188 | 9898 | /* Fixup kobjects */ |
a1b3f594 | 9899 | err = device_rename(&dev->dev, dev->name); |
8b41d188 | 9900 | WARN_ON(err); |
ce286d32 | 9901 | |
e61a8ced CB |
9902 | /* Adapt owner in case owning user namespace of target network |
9903 | * namespace is different from the original one. | |
9904 | */ | |
9905 | err = netdev_change_owner(dev, net_old, net); | |
9906 | WARN_ON(err); | |
9907 | ||
ce286d32 EB |
9908 | /* Add the device back in the hashes */ |
9909 | list_netdevice(dev); | |
9910 | ||
9911 | /* Notify protocols, that a new device appeared. */ | |
9912 | call_netdevice_notifiers(NETDEV_REGISTER, dev); | |
9913 | ||
d90a909e EB |
9914 | /* |
9915 | * Prevent userspace races by waiting until the network | |
9916 | * device is fully setup before sending notifications. | |
9917 | */ | |
7f294054 | 9918 | rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL); |
d90a909e | 9919 | |
ce286d32 EB |
9920 | synchronize_net(); |
9921 | err = 0; | |
9922 | out: | |
9923 | return err; | |
9924 | } | |
463d0183 | 9925 | EXPORT_SYMBOL_GPL(dev_change_net_namespace); |
ce286d32 | 9926 | |
f0bf90de | 9927 | static int dev_cpu_dead(unsigned int oldcpu) |
1da177e4 LT |
9928 | { |
9929 | struct sk_buff **list_skb; | |
1da177e4 | 9930 | struct sk_buff *skb; |
f0bf90de | 9931 | unsigned int cpu; |
97d8b6e3 | 9932 | struct softnet_data *sd, *oldsd, *remsd = NULL; |
1da177e4 | 9933 | |
1da177e4 LT |
9934 | local_irq_disable(); |
9935 | cpu = smp_processor_id(); | |
9936 | sd = &per_cpu(softnet_data, cpu); | |
9937 | oldsd = &per_cpu(softnet_data, oldcpu); | |
9938 | ||
9939 | /* Find end of our completion_queue. */ | |
9940 | list_skb = &sd->completion_queue; | |
9941 | while (*list_skb) | |
9942 | list_skb = &(*list_skb)->next; | |
9943 | /* Append completion queue from offline CPU. */ | |
9944 | *list_skb = oldsd->completion_queue; | |
9945 | oldsd->completion_queue = NULL; | |
9946 | ||
1da177e4 | 9947 | /* Append output queue from offline CPU. */ |
a9cbd588 CG |
9948 | if (oldsd->output_queue) { |
9949 | *sd->output_queue_tailp = oldsd->output_queue; | |
9950 | sd->output_queue_tailp = oldsd->output_queue_tailp; | |
9951 | oldsd->output_queue = NULL; | |
9952 | oldsd->output_queue_tailp = &oldsd->output_queue; | |
9953 | } | |
ac64da0b ED |
9954 | /* Append NAPI poll list from offline CPU, with one exception : |
9955 | * process_backlog() must be called by cpu owning percpu backlog. | |
9956 | * We properly handle process_queue & input_pkt_queue later. | |
9957 | */ | |
9958 | while (!list_empty(&oldsd->poll_list)) { | |
9959 | struct napi_struct *napi = list_first_entry(&oldsd->poll_list, | |
9960 | struct napi_struct, | |
9961 | poll_list); | |
9962 | ||
9963 | list_del_init(&napi->poll_list); | |
9964 | if (napi->poll == process_backlog) | |
9965 | napi->state = 0; | |
9966 | else | |
9967 | ____napi_schedule(sd, napi); | |
264524d5 | 9968 | } |
1da177e4 LT |
9969 | |
9970 | raise_softirq_irqoff(NET_TX_SOFTIRQ); | |
9971 | local_irq_enable(); | |
9972 | ||
773fc8f6 | 9973 | #ifdef CONFIG_RPS |
9974 | remsd = oldsd->rps_ipi_list; | |
9975 | oldsd->rps_ipi_list = NULL; | |
9976 | #endif | |
9977 | /* send out pending IPI's on offline CPU */ | |
9978 | net_rps_send_ipi(remsd); | |
9979 | ||
1da177e4 | 9980 | /* Process offline CPU's input_pkt_queue */ |
76cc8b13 | 9981 | while ((skb = __skb_dequeue(&oldsd->process_queue))) { |
91e83133 | 9982 | netif_rx_ni(skb); |
76cc8b13 | 9983 | input_queue_head_incr(oldsd); |
fec5e652 | 9984 | } |
ac64da0b | 9985 | while ((skb = skb_dequeue(&oldsd->input_pkt_queue))) { |
91e83133 | 9986 | netif_rx_ni(skb); |
76cc8b13 TH |
9987 | input_queue_head_incr(oldsd); |
9988 | } | |
1da177e4 | 9989 | |
f0bf90de | 9990 | return 0; |
1da177e4 | 9991 | } |
1da177e4 | 9992 | |
7f353bf2 | 9993 | /** |
b63365a2 HX |
9994 | * netdev_increment_features - increment feature set by one |
9995 | * @all: current feature set | |
9996 | * @one: new feature set | |
9997 | * @mask: mask feature set | |
7f353bf2 HX |
9998 | * |
9999 | * Computes a new feature set after adding a device with feature set | |
b63365a2 HX |
10000 | * @one to the master device with current feature set @all. Will not |
10001 | * enable anything that is off in @mask. Returns the new feature set. | |
7f353bf2 | 10002 | */ |
c8f44aff MM |
10003 | netdev_features_t netdev_increment_features(netdev_features_t all, |
10004 | netdev_features_t one, netdev_features_t mask) | |
b63365a2 | 10005 | { |
c8cd0989 | 10006 | if (mask & NETIF_F_HW_CSUM) |
a188222b | 10007 | mask |= NETIF_F_CSUM_MASK; |
1742f183 | 10008 | mask |= NETIF_F_VLAN_CHALLENGED; |
7f353bf2 | 10009 | |
a188222b | 10010 | all |= one & (NETIF_F_ONE_FOR_ALL | NETIF_F_CSUM_MASK) & mask; |
1742f183 | 10011 | all &= one | ~NETIF_F_ALL_FOR_ALL; |
c6e1a0d1 | 10012 | |
1742f183 | 10013 | /* If one device supports hw checksumming, set for all. */ |
c8cd0989 TH |
10014 | if (all & NETIF_F_HW_CSUM) |
10015 | all &= ~(NETIF_F_CSUM_MASK & ~NETIF_F_HW_CSUM); | |
7f353bf2 HX |
10016 | |
10017 | return all; | |
10018 | } | |
b63365a2 | 10019 | EXPORT_SYMBOL(netdev_increment_features); |
7f353bf2 | 10020 | |
430f03cd | 10021 | static struct hlist_head * __net_init netdev_create_hash(void) |
30d97d35 PE |
10022 | { |
10023 | int i; | |
10024 | struct hlist_head *hash; | |
10025 | ||
6da2ec56 | 10026 | hash = kmalloc_array(NETDEV_HASHENTRIES, sizeof(*hash), GFP_KERNEL); |
30d97d35 PE |
10027 | if (hash != NULL) |
10028 | for (i = 0; i < NETDEV_HASHENTRIES; i++) | |
10029 | INIT_HLIST_HEAD(&hash[i]); | |
10030 | ||
10031 | return hash; | |
10032 | } | |
10033 | ||
881d966b | 10034 | /* Initialize per network namespace state */ |
4665079c | 10035 | static int __net_init netdev_init(struct net *net) |
881d966b | 10036 | { |
d9f37d01 | 10037 | BUILD_BUG_ON(GRO_HASH_BUCKETS > |
ccdb5171 | 10038 | 8 * FIELD_SIZEOF(struct napi_struct, gro_bitmask)); |
d9f37d01 | 10039 | |
734b6541 RM |
10040 | if (net != &init_net) |
10041 | INIT_LIST_HEAD(&net->dev_base_head); | |
881d966b | 10042 | |
30d97d35 PE |
10043 | net->dev_name_head = netdev_create_hash(); |
10044 | if (net->dev_name_head == NULL) | |
10045 | goto err_name; | |
881d966b | 10046 | |
30d97d35 PE |
10047 | net->dev_index_head = netdev_create_hash(); |
10048 | if (net->dev_index_head == NULL) | |
10049 | goto err_idx; | |
881d966b EB |
10050 | |
10051 | return 0; | |
30d97d35 PE |
10052 | |
10053 | err_idx: | |
10054 | kfree(net->dev_name_head); | |
10055 | err_name: | |
10056 | return -ENOMEM; | |
881d966b EB |
10057 | } |
10058 | ||
f0db275a SH |
10059 | /** |
10060 | * netdev_drivername - network driver for the device | |
10061 | * @dev: network device | |
f0db275a SH |
10062 | * |
10063 | * Determine network driver for device. | |
10064 | */ | |
3019de12 | 10065 | const char *netdev_drivername(const struct net_device *dev) |
6579e57b | 10066 | { |
cf04a4c7 SH |
10067 | const struct device_driver *driver; |
10068 | const struct device *parent; | |
3019de12 | 10069 | const char *empty = ""; |
6579e57b AV |
10070 | |
10071 | parent = dev->dev.parent; | |
6579e57b | 10072 | if (!parent) |
3019de12 | 10073 | return empty; |
6579e57b AV |
10074 | |
10075 | driver = parent->driver; | |
10076 | if (driver && driver->name) | |
3019de12 DM |
10077 | return driver->name; |
10078 | return empty; | |
6579e57b AV |
10079 | } |
10080 | ||
6ea754eb JP |
10081 | static void __netdev_printk(const char *level, const struct net_device *dev, |
10082 | struct va_format *vaf) | |
256df2f3 | 10083 | { |
b004ff49 | 10084 | if (dev && dev->dev.parent) { |
6ea754eb JP |
10085 | dev_printk_emit(level[1] - '0', |
10086 | dev->dev.parent, | |
10087 | "%s %s %s%s: %pV", | |
10088 | dev_driver_string(dev->dev.parent), | |
10089 | dev_name(dev->dev.parent), | |
10090 | netdev_name(dev), netdev_reg_state(dev), | |
10091 | vaf); | |
b004ff49 | 10092 | } else if (dev) { |
6ea754eb JP |
10093 | printk("%s%s%s: %pV", |
10094 | level, netdev_name(dev), netdev_reg_state(dev), vaf); | |
b004ff49 | 10095 | } else { |
6ea754eb | 10096 | printk("%s(NULL net_device): %pV", level, vaf); |
b004ff49 | 10097 | } |
256df2f3 JP |
10098 | } |
10099 | ||
6ea754eb JP |
10100 | void netdev_printk(const char *level, const struct net_device *dev, |
10101 | const char *format, ...) | |
256df2f3 JP |
10102 | { |
10103 | struct va_format vaf; | |
10104 | va_list args; | |
256df2f3 JP |
10105 | |
10106 | va_start(args, format); | |
10107 | ||
10108 | vaf.fmt = format; | |
10109 | vaf.va = &args; | |
10110 | ||
6ea754eb | 10111 | __netdev_printk(level, dev, &vaf); |
b004ff49 | 10112 | |
256df2f3 | 10113 | va_end(args); |
256df2f3 JP |
10114 | } |
10115 | EXPORT_SYMBOL(netdev_printk); | |
10116 | ||
10117 | #define define_netdev_printk_level(func, level) \ | |
6ea754eb | 10118 | void func(const struct net_device *dev, const char *fmt, ...) \ |
256df2f3 | 10119 | { \ |
256df2f3 JP |
10120 | struct va_format vaf; \ |
10121 | va_list args; \ | |
10122 | \ | |
10123 | va_start(args, fmt); \ | |
10124 | \ | |
10125 | vaf.fmt = fmt; \ | |
10126 | vaf.va = &args; \ | |
10127 | \ | |
6ea754eb | 10128 | __netdev_printk(level, dev, &vaf); \ |
b004ff49 | 10129 | \ |
256df2f3 | 10130 | va_end(args); \ |
256df2f3 JP |
10131 | } \ |
10132 | EXPORT_SYMBOL(func); | |
10133 | ||
10134 | define_netdev_printk_level(netdev_emerg, KERN_EMERG); | |
10135 | define_netdev_printk_level(netdev_alert, KERN_ALERT); | |
10136 | define_netdev_printk_level(netdev_crit, KERN_CRIT); | |
10137 | define_netdev_printk_level(netdev_err, KERN_ERR); | |
10138 | define_netdev_printk_level(netdev_warn, KERN_WARNING); | |
10139 | define_netdev_printk_level(netdev_notice, KERN_NOTICE); | |
10140 | define_netdev_printk_level(netdev_info, KERN_INFO); | |
10141 | ||
4665079c | 10142 | static void __net_exit netdev_exit(struct net *net) |
881d966b EB |
10143 | { |
10144 | kfree(net->dev_name_head); | |
10145 | kfree(net->dev_index_head); | |
ee21b18b VA |
10146 | if (net != &init_net) |
10147 | WARN_ON_ONCE(!list_empty(&net->dev_base_head)); | |
881d966b EB |
10148 | } |
10149 | ||
022cbae6 | 10150 | static struct pernet_operations __net_initdata netdev_net_ops = { |
881d966b EB |
10151 | .init = netdev_init, |
10152 | .exit = netdev_exit, | |
10153 | }; | |
10154 | ||
4665079c | 10155 | static void __net_exit default_device_exit(struct net *net) |
ce286d32 | 10156 | { |
e008b5fc | 10157 | struct net_device *dev, *aux; |
ce286d32 | 10158 | /* |
e008b5fc | 10159 | * Push all migratable network devices back to the |
ce286d32 EB |
10160 | * initial network namespace |
10161 | */ | |
10162 | rtnl_lock(); | |
e008b5fc | 10163 | for_each_netdev_safe(net, dev, aux) { |
ce286d32 | 10164 | int err; |
aca51397 | 10165 | char fb_name[IFNAMSIZ]; |
ce286d32 EB |
10166 | |
10167 | /* Ignore unmoveable devices (i.e. loopback) */ | |
10168 | if (dev->features & NETIF_F_NETNS_LOCAL) | |
10169 | continue; | |
10170 | ||
e008b5fc | 10171 | /* Leave virtual devices for the generic cleanup */ |
7596246a | 10172 | if (dev->rtnl_link_ops && !dev->rtnl_link_ops->netns_refund) |
e008b5fc | 10173 | continue; |
d0c082ce | 10174 | |
25985edc | 10175 | /* Push remaining network devices to init_net */ |
aca51397 | 10176 | snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex); |
55b40dbf JP |
10177 | if (__dev_get_by_name(&init_net, fb_name)) |
10178 | snprintf(fb_name, IFNAMSIZ, "dev%%d"); | |
aca51397 | 10179 | err = dev_change_net_namespace(dev, &init_net, fb_name); |
ce286d32 | 10180 | if (err) { |
7b6cd1ce JP |
10181 | pr_emerg("%s: failed to move %s to init_net: %d\n", |
10182 | __func__, dev->name, err); | |
aca51397 | 10183 | BUG(); |
ce286d32 EB |
10184 | } |
10185 | } | |
10186 | rtnl_unlock(); | |
10187 | } | |
10188 | ||
50624c93 EB |
10189 | static void __net_exit rtnl_lock_unregistering(struct list_head *net_list) |
10190 | { | |
10191 | /* Return with the rtnl_lock held when there are no network | |
10192 | * devices unregistering in any network namespace in net_list. | |
10193 | */ | |
10194 | struct net *net; | |
10195 | bool unregistering; | |
ff960a73 | 10196 | DEFINE_WAIT_FUNC(wait, woken_wake_function); |
50624c93 | 10197 | |
ff960a73 | 10198 | add_wait_queue(&netdev_unregistering_wq, &wait); |
50624c93 | 10199 | for (;;) { |
50624c93 EB |
10200 | unregistering = false; |
10201 | rtnl_lock(); | |
10202 | list_for_each_entry(net, net_list, exit_list) { | |
10203 | if (net->dev_unreg_count > 0) { | |
10204 | unregistering = true; | |
10205 | break; | |
10206 | } | |
10207 | } | |
10208 | if (!unregistering) | |
10209 | break; | |
10210 | __rtnl_unlock(); | |
ff960a73 PZ |
10211 | |
10212 | wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT); | |
50624c93 | 10213 | } |
ff960a73 | 10214 | remove_wait_queue(&netdev_unregistering_wq, &wait); |
50624c93 EB |
10215 | } |
10216 | ||
04dc7f6b EB |
10217 | static void __net_exit default_device_exit_batch(struct list_head *net_list) |
10218 | { | |
10219 | /* At exit all network devices most be removed from a network | |
b595076a | 10220 | * namespace. Do this in the reverse order of registration. |
04dc7f6b EB |
10221 | * Do this across as many network namespaces as possible to |
10222 | * improve batching efficiency. | |
10223 | */ | |
10224 | struct net_device *dev; | |
10225 | struct net *net; | |
10226 | LIST_HEAD(dev_kill_list); | |
10227 | ||
50624c93 EB |
10228 | /* To prevent network device cleanup code from dereferencing |
10229 | * loopback devices or network devices that have been freed | |
10230 | * wait here for all pending unregistrations to complete, | |
10231 | * before unregistring the loopback device and allowing the | |
10232 | * network namespace be freed. | |
10233 | * | |
10234 | * The netdev todo list containing all network devices | |
10235 | * unregistrations that happen in default_device_exit_batch | |
10236 | * will run in the rtnl_unlock() at the end of | |
10237 | * default_device_exit_batch. | |
10238 | */ | |
10239 | rtnl_lock_unregistering(net_list); | |
04dc7f6b EB |
10240 | list_for_each_entry(net, net_list, exit_list) { |
10241 | for_each_netdev_reverse(net, dev) { | |
b0ab2fab | 10242 | if (dev->rtnl_link_ops && dev->rtnl_link_ops->dellink) |
04dc7f6b EB |
10243 | dev->rtnl_link_ops->dellink(dev, &dev_kill_list); |
10244 | else | |
10245 | unregister_netdevice_queue(dev, &dev_kill_list); | |
10246 | } | |
10247 | } | |
10248 | unregister_netdevice_many(&dev_kill_list); | |
10249 | rtnl_unlock(); | |
10250 | } | |
10251 | ||
022cbae6 | 10252 | static struct pernet_operations __net_initdata default_device_ops = { |
ce286d32 | 10253 | .exit = default_device_exit, |
04dc7f6b | 10254 | .exit_batch = default_device_exit_batch, |
ce286d32 EB |
10255 | }; |
10256 | ||
1da177e4 LT |
10257 | /* |
10258 | * Initialize the DEV module. At boot time this walks the device list and | |
10259 | * unhooks any devices that fail to initialise (normally hardware not | |
10260 | * present) and leaves us with a valid list of present and active devices. | |
10261 | * | |
10262 | */ | |
10263 | ||
10264 | /* | |
10265 | * This is called single threaded during boot, so no need | |
10266 | * to take the rtnl semaphore. | |
10267 | */ | |
10268 | static int __init net_dev_init(void) | |
10269 | { | |
10270 | int i, rc = -ENOMEM; | |
10271 | ||
10272 | BUG_ON(!dev_boot_phase); | |
10273 | ||
1da177e4 LT |
10274 | if (dev_proc_init()) |
10275 | goto out; | |
10276 | ||
8b41d188 | 10277 | if (netdev_kobject_init()) |
1da177e4 LT |
10278 | goto out; |
10279 | ||
10280 | INIT_LIST_HEAD(&ptype_all); | |
82d8a867 | 10281 | for (i = 0; i < PTYPE_HASH_SIZE; i++) |
1da177e4 LT |
10282 | INIT_LIST_HEAD(&ptype_base[i]); |
10283 | ||
62532da9 VY |
10284 | INIT_LIST_HEAD(&offload_base); |
10285 | ||
881d966b EB |
10286 | if (register_pernet_subsys(&netdev_net_ops)) |
10287 | goto out; | |
1da177e4 LT |
10288 | |
10289 | /* | |
10290 | * Initialise the packet receive queues. | |
10291 | */ | |
10292 | ||
6f912042 | 10293 | for_each_possible_cpu(i) { |
41852497 | 10294 | struct work_struct *flush = per_cpu_ptr(&flush_works, i); |
e36fa2f7 | 10295 | struct softnet_data *sd = &per_cpu(softnet_data, i); |
1da177e4 | 10296 | |
41852497 ED |
10297 | INIT_WORK(flush, flush_backlog); |
10298 | ||
e36fa2f7 | 10299 | skb_queue_head_init(&sd->input_pkt_queue); |
6e7676c1 | 10300 | skb_queue_head_init(&sd->process_queue); |
f53c7239 SK |
10301 | #ifdef CONFIG_XFRM_OFFLOAD |
10302 | skb_queue_head_init(&sd->xfrm_backlog); | |
10303 | #endif | |
e36fa2f7 | 10304 | INIT_LIST_HEAD(&sd->poll_list); |
a9cbd588 | 10305 | sd->output_queue_tailp = &sd->output_queue; |
df334545 | 10306 | #ifdef CONFIG_RPS |
e36fa2f7 ED |
10307 | sd->csd.func = rps_trigger_softirq; |
10308 | sd->csd.info = sd; | |
e36fa2f7 | 10309 | sd->cpu = i; |
1e94d72f | 10310 | #endif |
0a9627f2 | 10311 | |
7c4ec749 | 10312 | init_gro_hash(&sd->backlog); |
e36fa2f7 ED |
10313 | sd->backlog.poll = process_backlog; |
10314 | sd->backlog.weight = weight_p; | |
1da177e4 LT |
10315 | } |
10316 | ||
1da177e4 LT |
10317 | dev_boot_phase = 0; |
10318 | ||
505d4f73 EB |
10319 | /* The loopback device is special if any other network devices |
10320 | * is present in a network namespace the loopback device must | |
10321 | * be present. Since we now dynamically allocate and free the | |
10322 | * loopback device ensure this invariant is maintained by | |
10323 | * keeping the loopback device as the first device on the | |
10324 | * list of network devices. Ensuring the loopback devices | |
10325 | * is the first device that appears and the last network device | |
10326 | * that disappears. | |
10327 | */ | |
10328 | if (register_pernet_device(&loopback_net_ops)) | |
10329 | goto out; | |
10330 | ||
10331 | if (register_pernet_device(&default_device_ops)) | |
10332 | goto out; | |
10333 | ||
962cf36c CM |
10334 | open_softirq(NET_TX_SOFTIRQ, net_tx_action); |
10335 | open_softirq(NET_RX_SOFTIRQ, net_rx_action); | |
1da177e4 | 10336 | |
f0bf90de SAS |
10337 | rc = cpuhp_setup_state_nocalls(CPUHP_NET_DEV_DEAD, "net/dev:dead", |
10338 | NULL, dev_cpu_dead); | |
10339 | WARN_ON(rc < 0); | |
1da177e4 LT |
10340 | rc = 0; |
10341 | out: | |
10342 | return rc; | |
10343 | } | |
10344 | ||
10345 | subsys_initcall(net_dev_init); |