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Commit | Line | Data |
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1da177e4 | 1 | /* |
722c9a0c | 2 | * NET3 Protocol independent device support routines. |
1da177e4 LT |
3 | * |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * Derived from the non IP parts of dev.c 1.0.19 | |
722c9a0c | 10 | * Authors: Ross Biro |
1da177e4 LT |
11 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
12 | * Mark Evans, <evansmp@uhura.aston.ac.uk> | |
13 | * | |
14 | * Additional Authors: | |
15 | * Florian la Roche <rzsfl@rz.uni-sb.de> | |
16 | * Alan Cox <gw4pts@gw4pts.ampr.org> | |
17 | * David Hinds <dahinds@users.sourceforge.net> | |
18 | * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> | |
19 | * Adam Sulmicki <adam@cfar.umd.edu> | |
20 | * Pekka Riikonen <priikone@poesidon.pspt.fi> | |
21 | * | |
22 | * Changes: | |
23 | * D.J. Barrow : Fixed bug where dev->refcnt gets set | |
722c9a0c | 24 | * to 2 if register_netdev gets called |
25 | * before net_dev_init & also removed a | |
26 | * few lines of code in the process. | |
1da177e4 LT |
27 | * Alan Cox : device private ioctl copies fields back. |
28 | * Alan Cox : Transmit queue code does relevant | |
29 | * stunts to keep the queue safe. | |
30 | * Alan Cox : Fixed double lock. | |
31 | * Alan Cox : Fixed promisc NULL pointer trap | |
32 | * ???????? : Support the full private ioctl range | |
33 | * Alan Cox : Moved ioctl permission check into | |
34 | * drivers | |
35 | * Tim Kordas : SIOCADDMULTI/SIOCDELMULTI | |
36 | * Alan Cox : 100 backlog just doesn't cut it when | |
37 | * you start doing multicast video 8) | |
38 | * Alan Cox : Rewrote net_bh and list manager. | |
722c9a0c | 39 | * Alan Cox : Fix ETH_P_ALL echoback lengths. |
1da177e4 LT |
40 | * Alan Cox : Took out transmit every packet pass |
41 | * Saved a few bytes in the ioctl handler | |
42 | * Alan Cox : Network driver sets packet type before | |
43 | * calling netif_rx. Saves a function | |
44 | * call a packet. | |
45 | * Alan Cox : Hashed net_bh() | |
46 | * Richard Kooijman: Timestamp fixes. | |
47 | * Alan Cox : Wrong field in SIOCGIFDSTADDR | |
48 | * Alan Cox : Device lock protection. | |
722c9a0c | 49 | * Alan Cox : Fixed nasty side effect of device close |
1da177e4 LT |
50 | * changes. |
51 | * Rudi Cilibrasi : Pass the right thing to | |
52 | * set_mac_address() | |
53 | * Dave Miller : 32bit quantity for the device lock to | |
54 | * make it work out on a Sparc. | |
55 | * Bjorn Ekwall : Added KERNELD hack. | |
56 | * Alan Cox : Cleaned up the backlog initialise. | |
57 | * Craig Metz : SIOCGIFCONF fix if space for under | |
58 | * 1 device. | |
59 | * Thomas Bogendoerfer : Return ENODEV for dev_open, if there | |
60 | * is no device open function. | |
61 | * Andi Kleen : Fix error reporting for SIOCGIFCONF | |
62 | * Michael Chastain : Fix signed/unsigned for SIOCGIFCONF | |
63 | * Cyrus Durgin : Cleaned for KMOD | |
64 | * Adam Sulmicki : Bug Fix : Network Device Unload | |
65 | * A network device unload needs to purge | |
66 | * the backlog queue. | |
67 | * Paul Rusty Russell : SIOCSIFNAME | |
68 | * Pekka Riikonen : Netdev boot-time settings code | |
69 | * Andrew Morton : Make unregister_netdevice wait | |
722c9a0c | 70 | * indefinitely on dev->refcnt |
71 | * J Hadi Salim : - Backlog queue sampling | |
1da177e4 LT |
72 | * - netif_rx() feedback |
73 | */ | |
74 | ||
7c0f6ba6 | 75 | #include <linux/uaccess.h> |
1da177e4 | 76 | #include <linux/bitops.h> |
4fc268d2 | 77 | #include <linux/capability.h> |
1da177e4 LT |
78 | #include <linux/cpu.h> |
79 | #include <linux/types.h> | |
80 | #include <linux/kernel.h> | |
08e9897d | 81 | #include <linux/hash.h> |
5a0e3ad6 | 82 | #include <linux/slab.h> |
1da177e4 | 83 | #include <linux/sched.h> |
f1083048 | 84 | #include <linux/sched/mm.h> |
4a3e2f71 | 85 | #include <linux/mutex.h> |
1da177e4 LT |
86 | #include <linux/string.h> |
87 | #include <linux/mm.h> | |
88 | #include <linux/socket.h> | |
89 | #include <linux/sockios.h> | |
90 | #include <linux/errno.h> | |
91 | #include <linux/interrupt.h> | |
92 | #include <linux/if_ether.h> | |
93 | #include <linux/netdevice.h> | |
94 | #include <linux/etherdevice.h> | |
0187bdfb | 95 | #include <linux/ethtool.h> |
1da177e4 LT |
96 | #include <linux/notifier.h> |
97 | #include <linux/skbuff.h> | |
a7862b45 | 98 | #include <linux/bpf.h> |
b5cdae32 | 99 | #include <linux/bpf_trace.h> |
457c4cbc | 100 | #include <net/net_namespace.h> |
1da177e4 | 101 | #include <net/sock.h> |
02d62e86 | 102 | #include <net/busy_poll.h> |
1da177e4 | 103 | #include <linux/rtnetlink.h> |
1da177e4 | 104 | #include <linux/stat.h> |
1da177e4 | 105 | #include <net/dst.h> |
fc4099f1 | 106 | #include <net/dst_metadata.h> |
1da177e4 LT |
107 | #include <net/pkt_sched.h> |
108 | #include <net/checksum.h> | |
44540960 | 109 | #include <net/xfrm.h> |
1da177e4 LT |
110 | #include <linux/highmem.h> |
111 | #include <linux/init.h> | |
1da177e4 | 112 | #include <linux/module.h> |
1da177e4 LT |
113 | #include <linux/netpoll.h> |
114 | #include <linux/rcupdate.h> | |
115 | #include <linux/delay.h> | |
1da177e4 | 116 | #include <net/iw_handler.h> |
1da177e4 | 117 | #include <asm/current.h> |
5bdb9886 | 118 | #include <linux/audit.h> |
db217334 | 119 | #include <linux/dmaengine.h> |
f6a78bfc | 120 | #include <linux/err.h> |
c7fa9d18 | 121 | #include <linux/ctype.h> |
723e98b7 | 122 | #include <linux/if_arp.h> |
6de329e2 | 123 | #include <linux/if_vlan.h> |
8f0f2223 | 124 | #include <linux/ip.h> |
ad55dcaf | 125 | #include <net/ip.h> |
25cd9ba0 | 126 | #include <net/mpls.h> |
8f0f2223 DM |
127 | #include <linux/ipv6.h> |
128 | #include <linux/in.h> | |
b6b2fed1 DM |
129 | #include <linux/jhash.h> |
130 | #include <linux/random.h> | |
9cbc1cb8 | 131 | #include <trace/events/napi.h> |
cf66ba58 | 132 | #include <trace/events/net.h> |
07dc22e7 | 133 | #include <trace/events/skb.h> |
5acbbd42 | 134 | #include <linux/pci.h> |
caeda9b9 | 135 | #include <linux/inetdevice.h> |
c445477d | 136 | #include <linux/cpu_rmap.h> |
c5905afb | 137 | #include <linux/static_key.h> |
af12fa6e | 138 | #include <linux/hashtable.h> |
60877a32 | 139 | #include <linux/vmalloc.h> |
529d0489 | 140 | #include <linux/if_macvlan.h> |
e7fd2885 | 141 | #include <linux/errqueue.h> |
3b47d303 | 142 | #include <linux/hrtimer.h> |
e687ad60 | 143 | #include <linux/netfilter_ingress.h> |
40e4e713 | 144 | #include <linux/crash_dump.h> |
1da177e4 | 145 | |
342709ef PE |
146 | #include "net-sysfs.h" |
147 | ||
d565b0a1 HX |
148 | /* Instead of increasing this, you should create a hash table. */ |
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 LP |
161 | static int call_netdevice_notifiers_info(unsigned long val, |
162 | struct net_device *dev, | |
163 | struct netdev_notifier_info *info); | |
ae78dbfa | 164 | |
1da177e4 | 165 | /* |
7562f876 | 166 | * The @dev_base_head list is protected by @dev_base_lock and the rtnl |
1da177e4 LT |
167 | * semaphore. |
168 | * | |
c6d14c84 | 169 | * Pure readers hold dev_base_lock for reading, or rcu_read_lock() |
1da177e4 LT |
170 | * |
171 | * Writers must hold the rtnl semaphore while they loop through the | |
7562f876 | 172 | * dev_base_head list, and hold dev_base_lock for writing when they do the |
1da177e4 LT |
173 | * actual updates. This allows pure readers to access the list even |
174 | * while a writer is preparing to update it. | |
175 | * | |
176 | * To put it another way, dev_base_lock is held for writing only to | |
177 | * protect against pure readers; the rtnl semaphore provides the | |
178 | * protection against other writers. | |
179 | * | |
180 | * See, for example usages, register_netdevice() and | |
181 | * unregister_netdevice(), which must be called with the rtnl | |
182 | * semaphore held. | |
183 | */ | |
1da177e4 | 184 | DEFINE_RWLOCK(dev_base_lock); |
1da177e4 LT |
185 | EXPORT_SYMBOL(dev_base_lock); |
186 | ||
af12fa6e ET |
187 | /* protects napi_hash addition/deletion and napi_gen_id */ |
188 | static DEFINE_SPINLOCK(napi_hash_lock); | |
189 | ||
52bd2d62 | 190 | static unsigned int napi_gen_id = NR_CPUS; |
6180d9de | 191 | static DEFINE_READ_MOSTLY_HASHTABLE(napi_hash, 8); |
af12fa6e | 192 | |
18afa4b0 | 193 | static seqcount_t devnet_rename_seq; |
c91f6df2 | 194 | |
4e985ada TG |
195 | static inline void dev_base_seq_inc(struct net *net) |
196 | { | |
643aa9cb | 197 | while (++net->dev_base_seq == 0) |
198 | ; | |
4e985ada TG |
199 | } |
200 | ||
881d966b | 201 | static inline struct hlist_head *dev_name_hash(struct net *net, const char *name) |
1da177e4 | 202 | { |
8387ff25 | 203 | unsigned int hash = full_name_hash(net, name, strnlen(name, IFNAMSIZ)); |
95c96174 | 204 | |
08e9897d | 205 | return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)]; |
1da177e4 LT |
206 | } |
207 | ||
881d966b | 208 | static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex) |
1da177e4 | 209 | { |
7c28bd0b | 210 | return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)]; |
1da177e4 LT |
211 | } |
212 | ||
e36fa2f7 | 213 | static inline void rps_lock(struct softnet_data *sd) |
152102c7 CG |
214 | { |
215 | #ifdef CONFIG_RPS | |
e36fa2f7 | 216 | spin_lock(&sd->input_pkt_queue.lock); |
152102c7 CG |
217 | #endif |
218 | } | |
219 | ||
e36fa2f7 | 220 | static inline void rps_unlock(struct softnet_data *sd) |
152102c7 CG |
221 | { |
222 | #ifdef CONFIG_RPS | |
e36fa2f7 | 223 | spin_unlock(&sd->input_pkt_queue.lock); |
152102c7 CG |
224 | #endif |
225 | } | |
226 | ||
ce286d32 | 227 | /* Device list insertion */ |
53759be9 | 228 | static void list_netdevice(struct net_device *dev) |
ce286d32 | 229 | { |
c346dca1 | 230 | struct net *net = dev_net(dev); |
ce286d32 EB |
231 | |
232 | ASSERT_RTNL(); | |
233 | ||
234 | write_lock_bh(&dev_base_lock); | |
c6d14c84 | 235 | list_add_tail_rcu(&dev->dev_list, &net->dev_base_head); |
72c9528b | 236 | hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name)); |
fb699dfd ED |
237 | hlist_add_head_rcu(&dev->index_hlist, |
238 | dev_index_hash(net, dev->ifindex)); | |
ce286d32 | 239 | write_unlock_bh(&dev_base_lock); |
4e985ada TG |
240 | |
241 | dev_base_seq_inc(net); | |
ce286d32 EB |
242 | } |
243 | ||
fb699dfd ED |
244 | /* Device list removal |
245 | * caller must respect a RCU grace period before freeing/reusing dev | |
246 | */ | |
ce286d32 EB |
247 | static void unlist_netdevice(struct net_device *dev) |
248 | { | |
249 | ASSERT_RTNL(); | |
250 | ||
251 | /* Unlink dev from the device chain */ | |
252 | write_lock_bh(&dev_base_lock); | |
c6d14c84 | 253 | list_del_rcu(&dev->dev_list); |
72c9528b | 254 | hlist_del_rcu(&dev->name_hlist); |
fb699dfd | 255 | hlist_del_rcu(&dev->index_hlist); |
ce286d32 | 256 | write_unlock_bh(&dev_base_lock); |
4e985ada TG |
257 | |
258 | dev_base_seq_inc(dev_net(dev)); | |
ce286d32 EB |
259 | } |
260 | ||
1da177e4 LT |
261 | /* |
262 | * Our notifier list | |
263 | */ | |
264 | ||
f07d5b94 | 265 | static RAW_NOTIFIER_HEAD(netdev_chain); |
1da177e4 LT |
266 | |
267 | /* | |
268 | * Device drivers call our routines to queue packets here. We empty the | |
269 | * queue in the local softnet handler. | |
270 | */ | |
bea3348e | 271 | |
9958da05 | 272 | DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data); |
d1b19dff | 273 | EXPORT_PER_CPU_SYMBOL(softnet_data); |
1da177e4 | 274 | |
cf508b12 | 275 | #ifdef CONFIG_LOCKDEP |
723e98b7 | 276 | /* |
c773e847 | 277 | * register_netdevice() inits txq->_xmit_lock and sets lockdep class |
723e98b7 JP |
278 | * according to dev->type |
279 | */ | |
643aa9cb | 280 | static const unsigned short netdev_lock_type[] = { |
281 | ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25, | |
723e98b7 JP |
282 | ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET, |
283 | ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM, | |
284 | ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP, | |
285 | ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD, | |
286 | ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25, | |
287 | ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP, | |
288 | ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD, | |
289 | ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI, | |
290 | ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE, | |
291 | ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET, | |
292 | ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL, | |
211ed865 PG |
293 | ARPHRD_FCFABRIC, ARPHRD_IEEE80211, ARPHRD_IEEE80211_PRISM, |
294 | ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET, ARPHRD_PHONET_PIPE, | |
295 | ARPHRD_IEEE802154, ARPHRD_VOID, ARPHRD_NONE}; | |
723e98b7 | 296 | |
643aa9cb | 297 | static const char *const netdev_lock_name[] = { |
298 | "_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25", | |
299 | "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET", | |
300 | "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM", | |
301 | "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP", | |
302 | "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD", | |
303 | "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25", | |
304 | "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP", | |
305 | "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD", | |
306 | "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI", | |
307 | "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE", | |
308 | "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET", | |
309 | "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL", | |
310 | "_xmit_FCFABRIC", "_xmit_IEEE80211", "_xmit_IEEE80211_PRISM", | |
311 | "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", "_xmit_PHONET_PIPE", | |
312 | "_xmit_IEEE802154", "_xmit_VOID", "_xmit_NONE"}; | |
723e98b7 JP |
313 | |
314 | static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)]; | |
cf508b12 | 315 | static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)]; |
723e98b7 JP |
316 | |
317 | static inline unsigned short netdev_lock_pos(unsigned short dev_type) | |
318 | { | |
319 | int i; | |
320 | ||
321 | for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++) | |
322 | if (netdev_lock_type[i] == dev_type) | |
323 | return i; | |
324 | /* the last key is used by default */ | |
325 | return ARRAY_SIZE(netdev_lock_type) - 1; | |
326 | } | |
327 | ||
cf508b12 DM |
328 | static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock, |
329 | unsigned short dev_type) | |
723e98b7 JP |
330 | { |
331 | int i; | |
332 | ||
333 | i = netdev_lock_pos(dev_type); | |
334 | lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i], | |
335 | netdev_lock_name[i]); | |
336 | } | |
cf508b12 DM |
337 | |
338 | static inline void netdev_set_addr_lockdep_class(struct net_device *dev) | |
339 | { | |
340 | int i; | |
341 | ||
342 | i = netdev_lock_pos(dev->type); | |
343 | lockdep_set_class_and_name(&dev->addr_list_lock, | |
344 | &netdev_addr_lock_key[i], | |
345 | netdev_lock_name[i]); | |
346 | } | |
723e98b7 | 347 | #else |
cf508b12 DM |
348 | static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock, |
349 | unsigned short dev_type) | |
350 | { | |
351 | } | |
352 | static inline void netdev_set_addr_lockdep_class(struct net_device *dev) | |
723e98b7 JP |
353 | { |
354 | } | |
355 | #endif | |
1da177e4 LT |
356 | |
357 | /******************************************************************************* | |
eb13da1a | 358 | * |
359 | * Protocol management and registration routines | |
360 | * | |
361 | *******************************************************************************/ | |
1da177e4 | 362 | |
1da177e4 | 363 | |
1da177e4 LT |
364 | /* |
365 | * Add a protocol ID to the list. Now that the input handler is | |
366 | * smarter we can dispense with all the messy stuff that used to be | |
367 | * here. | |
368 | * | |
369 | * BEWARE!!! Protocol handlers, mangling input packets, | |
370 | * MUST BE last in hash buckets and checking protocol handlers | |
371 | * MUST start from promiscuous ptype_all chain in net_bh. | |
372 | * It is true now, do not change it. | |
373 | * Explanation follows: if protocol handler, mangling packet, will | |
374 | * be the first on list, it is not able to sense, that packet | |
375 | * is cloned and should be copied-on-write, so that it will | |
376 | * change it and subsequent readers will get broken packet. | |
377 | * --ANK (980803) | |
378 | */ | |
379 | ||
c07b68e8 ED |
380 | static inline struct list_head *ptype_head(const struct packet_type *pt) |
381 | { | |
382 | if (pt->type == htons(ETH_P_ALL)) | |
7866a621 | 383 | return pt->dev ? &pt->dev->ptype_all : &ptype_all; |
c07b68e8 | 384 | else |
7866a621 SN |
385 | return pt->dev ? &pt->dev->ptype_specific : |
386 | &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK]; | |
c07b68e8 ED |
387 | } |
388 | ||
1da177e4 LT |
389 | /** |
390 | * dev_add_pack - add packet handler | |
391 | * @pt: packet type declaration | |
392 | * | |
393 | * Add a protocol handler to the networking stack. The passed &packet_type | |
394 | * is linked into kernel lists and may not be freed until it has been | |
395 | * removed from the kernel lists. | |
396 | * | |
4ec93edb | 397 | * This call does not sleep therefore it can not |
1da177e4 LT |
398 | * guarantee all CPU's that are in middle of receiving packets |
399 | * will see the new packet type (until the next received packet). | |
400 | */ | |
401 | ||
402 | void dev_add_pack(struct packet_type *pt) | |
403 | { | |
c07b68e8 | 404 | struct list_head *head = ptype_head(pt); |
1da177e4 | 405 | |
c07b68e8 ED |
406 | spin_lock(&ptype_lock); |
407 | list_add_rcu(&pt->list, head); | |
408 | spin_unlock(&ptype_lock); | |
1da177e4 | 409 | } |
d1b19dff | 410 | EXPORT_SYMBOL(dev_add_pack); |
1da177e4 | 411 | |
1da177e4 LT |
412 | /** |
413 | * __dev_remove_pack - remove packet handler | |
414 | * @pt: packet type declaration | |
415 | * | |
416 | * Remove a protocol handler that was previously added to the kernel | |
417 | * protocol handlers by dev_add_pack(). The passed &packet_type is removed | |
418 | * from the kernel lists and can be freed or reused once this function | |
4ec93edb | 419 | * returns. |
1da177e4 LT |
420 | * |
421 | * The packet type might still be in use by receivers | |
422 | * and must not be freed until after all the CPU's have gone | |
423 | * through a quiescent state. | |
424 | */ | |
425 | void __dev_remove_pack(struct packet_type *pt) | |
426 | { | |
c07b68e8 | 427 | struct list_head *head = ptype_head(pt); |
1da177e4 LT |
428 | struct packet_type *pt1; |
429 | ||
c07b68e8 | 430 | spin_lock(&ptype_lock); |
1da177e4 LT |
431 | |
432 | list_for_each_entry(pt1, head, list) { | |
433 | if (pt == pt1) { | |
434 | list_del_rcu(&pt->list); | |
435 | goto out; | |
436 | } | |
437 | } | |
438 | ||
7b6cd1ce | 439 | pr_warn("dev_remove_pack: %p not found\n", pt); |
1da177e4 | 440 | out: |
c07b68e8 | 441 | spin_unlock(&ptype_lock); |
1da177e4 | 442 | } |
d1b19dff ED |
443 | EXPORT_SYMBOL(__dev_remove_pack); |
444 | ||
1da177e4 LT |
445 | /** |
446 | * dev_remove_pack - remove packet handler | |
447 | * @pt: packet type declaration | |
448 | * | |
449 | * Remove a protocol handler that was previously added to the kernel | |
450 | * protocol handlers by dev_add_pack(). The passed &packet_type is removed | |
451 | * from the kernel lists and can be freed or reused once this function | |
452 | * returns. | |
453 | * | |
454 | * This call sleeps to guarantee that no CPU is looking at the packet | |
455 | * type after return. | |
456 | */ | |
457 | void dev_remove_pack(struct packet_type *pt) | |
458 | { | |
459 | __dev_remove_pack(pt); | |
4ec93edb | 460 | |
1da177e4 LT |
461 | synchronize_net(); |
462 | } | |
d1b19dff | 463 | EXPORT_SYMBOL(dev_remove_pack); |
1da177e4 | 464 | |
62532da9 VY |
465 | |
466 | /** | |
467 | * dev_add_offload - register offload handlers | |
468 | * @po: protocol offload declaration | |
469 | * | |
470 | * Add protocol offload handlers to the networking stack. The passed | |
471 | * &proto_offload is linked into kernel lists and may not be freed until | |
472 | * it has been removed from the kernel lists. | |
473 | * | |
474 | * This call does not sleep therefore it can not | |
475 | * guarantee all CPU's that are in middle of receiving packets | |
476 | * will see the new offload handlers (until the next received packet). | |
477 | */ | |
478 | void dev_add_offload(struct packet_offload *po) | |
479 | { | |
bdef7de4 | 480 | struct packet_offload *elem; |
62532da9 VY |
481 | |
482 | spin_lock(&offload_lock); | |
bdef7de4 DM |
483 | list_for_each_entry(elem, &offload_base, list) { |
484 | if (po->priority < elem->priority) | |
485 | break; | |
486 | } | |
487 | list_add_rcu(&po->list, elem->list.prev); | |
62532da9 VY |
488 | spin_unlock(&offload_lock); |
489 | } | |
490 | EXPORT_SYMBOL(dev_add_offload); | |
491 | ||
492 | /** | |
493 | * __dev_remove_offload - remove offload handler | |
494 | * @po: packet offload declaration | |
495 | * | |
496 | * Remove a protocol offload handler that was previously added to the | |
497 | * kernel offload handlers by dev_add_offload(). The passed &offload_type | |
498 | * is removed from the kernel lists and can be freed or reused once this | |
499 | * function returns. | |
500 | * | |
501 | * The packet type might still be in use by receivers | |
502 | * and must not be freed until after all the CPU's have gone | |
503 | * through a quiescent state. | |
504 | */ | |
1d143d9f | 505 | static void __dev_remove_offload(struct packet_offload *po) |
62532da9 VY |
506 | { |
507 | struct list_head *head = &offload_base; | |
508 | struct packet_offload *po1; | |
509 | ||
c53aa505 | 510 | spin_lock(&offload_lock); |
62532da9 VY |
511 | |
512 | list_for_each_entry(po1, head, list) { | |
513 | if (po == po1) { | |
514 | list_del_rcu(&po->list); | |
515 | goto out; | |
516 | } | |
517 | } | |
518 | ||
519 | pr_warn("dev_remove_offload: %p not found\n", po); | |
520 | out: | |
c53aa505 | 521 | spin_unlock(&offload_lock); |
62532da9 | 522 | } |
62532da9 VY |
523 | |
524 | /** | |
525 | * dev_remove_offload - remove packet offload handler | |
526 | * @po: packet offload declaration | |
527 | * | |
528 | * Remove a packet offload handler that was previously added to the kernel | |
529 | * offload handlers by dev_add_offload(). The passed &offload_type is | |
530 | * removed from the kernel lists and can be freed or reused once this | |
531 | * function returns. | |
532 | * | |
533 | * This call sleeps to guarantee that no CPU is looking at the packet | |
534 | * type after return. | |
535 | */ | |
536 | void dev_remove_offload(struct packet_offload *po) | |
537 | { | |
538 | __dev_remove_offload(po); | |
539 | ||
540 | synchronize_net(); | |
541 | } | |
542 | EXPORT_SYMBOL(dev_remove_offload); | |
543 | ||
1da177e4 | 544 | /****************************************************************************** |
eb13da1a | 545 | * |
546 | * Device Boot-time Settings Routines | |
547 | * | |
548 | ******************************************************************************/ | |
1da177e4 LT |
549 | |
550 | /* Boot time configuration table */ | |
551 | static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX]; | |
552 | ||
553 | /** | |
554 | * netdev_boot_setup_add - add new setup entry | |
555 | * @name: name of the device | |
556 | * @map: configured settings for the device | |
557 | * | |
558 | * Adds new setup entry to the dev_boot_setup list. The function | |
559 | * returns 0 on error and 1 on success. This is a generic routine to | |
560 | * all netdevices. | |
561 | */ | |
562 | static int netdev_boot_setup_add(char *name, struct ifmap *map) | |
563 | { | |
564 | struct netdev_boot_setup *s; | |
565 | int i; | |
566 | ||
567 | s = dev_boot_setup; | |
568 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) { | |
569 | if (s[i].name[0] == '\0' || s[i].name[0] == ' ') { | |
570 | memset(s[i].name, 0, sizeof(s[i].name)); | |
93b3cff9 | 571 | strlcpy(s[i].name, name, IFNAMSIZ); |
1da177e4 LT |
572 | memcpy(&s[i].map, map, sizeof(s[i].map)); |
573 | break; | |
574 | } | |
575 | } | |
576 | ||
577 | return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1; | |
578 | } | |
579 | ||
580 | /** | |
722c9a0c | 581 | * netdev_boot_setup_check - check boot time settings |
582 | * @dev: the netdevice | |
1da177e4 | 583 | * |
722c9a0c | 584 | * Check boot time settings for the device. |
585 | * The found settings are set for the device to be used | |
586 | * later in the device probing. | |
587 | * Returns 0 if no settings found, 1 if they are. | |
1da177e4 LT |
588 | */ |
589 | int netdev_boot_setup_check(struct net_device *dev) | |
590 | { | |
591 | struct netdev_boot_setup *s = dev_boot_setup; | |
592 | int i; | |
593 | ||
594 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) { | |
595 | if (s[i].name[0] != '\0' && s[i].name[0] != ' ' && | |
93b3cff9 | 596 | !strcmp(dev->name, s[i].name)) { |
722c9a0c | 597 | dev->irq = s[i].map.irq; |
598 | dev->base_addr = s[i].map.base_addr; | |
599 | dev->mem_start = s[i].map.mem_start; | |
600 | dev->mem_end = s[i].map.mem_end; | |
1da177e4 LT |
601 | return 1; |
602 | } | |
603 | } | |
604 | return 0; | |
605 | } | |
d1b19dff | 606 | EXPORT_SYMBOL(netdev_boot_setup_check); |
1da177e4 LT |
607 | |
608 | ||
609 | /** | |
722c9a0c | 610 | * netdev_boot_base - get address from boot time settings |
611 | * @prefix: prefix for network device | |
612 | * @unit: id for network device | |
613 | * | |
614 | * Check boot time settings for the base address of device. | |
615 | * The found settings are set for the device to be used | |
616 | * later in the device probing. | |
617 | * Returns 0 if no settings found. | |
1da177e4 LT |
618 | */ |
619 | unsigned long netdev_boot_base(const char *prefix, int unit) | |
620 | { | |
621 | const struct netdev_boot_setup *s = dev_boot_setup; | |
622 | char name[IFNAMSIZ]; | |
623 | int i; | |
624 | ||
625 | sprintf(name, "%s%d", prefix, unit); | |
626 | ||
627 | /* | |
628 | * If device already registered then return base of 1 | |
629 | * to indicate not to probe for this interface | |
630 | */ | |
881d966b | 631 | if (__dev_get_by_name(&init_net, name)) |
1da177e4 LT |
632 | return 1; |
633 | ||
634 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) | |
635 | if (!strcmp(name, s[i].name)) | |
636 | return s[i].map.base_addr; | |
637 | return 0; | |
638 | } | |
639 | ||
640 | /* | |
641 | * Saves at boot time configured settings for any netdevice. | |
642 | */ | |
643 | int __init netdev_boot_setup(char *str) | |
644 | { | |
645 | int ints[5]; | |
646 | struct ifmap map; | |
647 | ||
648 | str = get_options(str, ARRAY_SIZE(ints), ints); | |
649 | if (!str || !*str) | |
650 | return 0; | |
651 | ||
652 | /* Save settings */ | |
653 | memset(&map, 0, sizeof(map)); | |
654 | if (ints[0] > 0) | |
655 | map.irq = ints[1]; | |
656 | if (ints[0] > 1) | |
657 | map.base_addr = ints[2]; | |
658 | if (ints[0] > 2) | |
659 | map.mem_start = ints[3]; | |
660 | if (ints[0] > 3) | |
661 | map.mem_end = ints[4]; | |
662 | ||
663 | /* Add new entry to the list */ | |
664 | return netdev_boot_setup_add(str, &map); | |
665 | } | |
666 | ||
667 | __setup("netdev=", netdev_boot_setup); | |
668 | ||
669 | /******************************************************************************* | |
eb13da1a | 670 | * |
671 | * Device Interface Subroutines | |
672 | * | |
673 | *******************************************************************************/ | |
1da177e4 | 674 | |
a54acb3a ND |
675 | /** |
676 | * dev_get_iflink - get 'iflink' value of a interface | |
677 | * @dev: targeted interface | |
678 | * | |
679 | * Indicates the ifindex the interface is linked to. | |
680 | * Physical interfaces have the same 'ifindex' and 'iflink' values. | |
681 | */ | |
682 | ||
683 | int dev_get_iflink(const struct net_device *dev) | |
684 | { | |
685 | if (dev->netdev_ops && dev->netdev_ops->ndo_get_iflink) | |
686 | return dev->netdev_ops->ndo_get_iflink(dev); | |
687 | ||
7a66bbc9 | 688 | return dev->ifindex; |
a54acb3a ND |
689 | } |
690 | EXPORT_SYMBOL(dev_get_iflink); | |
691 | ||
fc4099f1 PS |
692 | /** |
693 | * dev_fill_metadata_dst - Retrieve tunnel egress information. | |
694 | * @dev: targeted interface | |
695 | * @skb: The packet. | |
696 | * | |
697 | * For better visibility of tunnel traffic OVS needs to retrieve | |
698 | * egress tunnel information for a packet. Following API allows | |
699 | * user to get this info. | |
700 | */ | |
701 | int dev_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) | |
702 | { | |
703 | struct ip_tunnel_info *info; | |
704 | ||
705 | if (!dev->netdev_ops || !dev->netdev_ops->ndo_fill_metadata_dst) | |
706 | return -EINVAL; | |
707 | ||
708 | info = skb_tunnel_info_unclone(skb); | |
709 | if (!info) | |
710 | return -ENOMEM; | |
711 | if (unlikely(!(info->mode & IP_TUNNEL_INFO_TX))) | |
712 | return -EINVAL; | |
713 | ||
714 | return dev->netdev_ops->ndo_fill_metadata_dst(dev, skb); | |
715 | } | |
716 | EXPORT_SYMBOL_GPL(dev_fill_metadata_dst); | |
717 | ||
1da177e4 LT |
718 | /** |
719 | * __dev_get_by_name - find a device by its name | |
c4ea43c5 | 720 | * @net: the applicable net namespace |
1da177e4 LT |
721 | * @name: name to find |
722 | * | |
723 | * Find an interface by name. Must be called under RTNL semaphore | |
724 | * or @dev_base_lock. If the name is found a pointer to the device | |
725 | * is returned. If the name is not found then %NULL is returned. The | |
726 | * reference counters are not incremented so the caller must be | |
727 | * careful with locks. | |
728 | */ | |
729 | ||
881d966b | 730 | struct net_device *__dev_get_by_name(struct net *net, const char *name) |
1da177e4 | 731 | { |
0bd8d536 ED |
732 | struct net_device *dev; |
733 | struct hlist_head *head = dev_name_hash(net, name); | |
1da177e4 | 734 | |
b67bfe0d | 735 | hlist_for_each_entry(dev, head, name_hlist) |
1da177e4 LT |
736 | if (!strncmp(dev->name, name, IFNAMSIZ)) |
737 | return dev; | |
0bd8d536 | 738 | |
1da177e4 LT |
739 | return NULL; |
740 | } | |
d1b19dff | 741 | EXPORT_SYMBOL(__dev_get_by_name); |
1da177e4 | 742 | |
72c9528b | 743 | /** |
722c9a0c | 744 | * dev_get_by_name_rcu - find a device by its name |
745 | * @net: the applicable net namespace | |
746 | * @name: name to find | |
747 | * | |
748 | * Find an interface by name. | |
749 | * If the name is found a pointer to the device is returned. | |
750 | * If the name is not found then %NULL is returned. | |
751 | * The reference counters are not incremented so the caller must be | |
752 | * careful with locks. The caller must hold RCU lock. | |
72c9528b ED |
753 | */ |
754 | ||
755 | struct net_device *dev_get_by_name_rcu(struct net *net, const char *name) | |
756 | { | |
72c9528b ED |
757 | struct net_device *dev; |
758 | struct hlist_head *head = dev_name_hash(net, name); | |
759 | ||
b67bfe0d | 760 | hlist_for_each_entry_rcu(dev, head, name_hlist) |
72c9528b ED |
761 | if (!strncmp(dev->name, name, IFNAMSIZ)) |
762 | return dev; | |
763 | ||
764 | return NULL; | |
765 | } | |
766 | EXPORT_SYMBOL(dev_get_by_name_rcu); | |
767 | ||
1da177e4 LT |
768 | /** |
769 | * dev_get_by_name - find a device by its name | |
c4ea43c5 | 770 | * @net: the applicable net namespace |
1da177e4 LT |
771 | * @name: name to find |
772 | * | |
773 | * Find an interface by name. This can be called from any | |
774 | * context and does its own locking. The returned handle has | |
775 | * the usage count incremented and the caller must use dev_put() to | |
776 | * release it when it is no longer needed. %NULL is returned if no | |
777 | * matching device is found. | |
778 | */ | |
779 | ||
881d966b | 780 | struct net_device *dev_get_by_name(struct net *net, const char *name) |
1da177e4 LT |
781 | { |
782 | struct net_device *dev; | |
783 | ||
72c9528b ED |
784 | rcu_read_lock(); |
785 | dev = dev_get_by_name_rcu(net, name); | |
1da177e4 LT |
786 | if (dev) |
787 | dev_hold(dev); | |
72c9528b | 788 | rcu_read_unlock(); |
1da177e4 LT |
789 | return dev; |
790 | } | |
d1b19dff | 791 | EXPORT_SYMBOL(dev_get_by_name); |
1da177e4 LT |
792 | |
793 | /** | |
794 | * __dev_get_by_index - find a device by its ifindex | |
c4ea43c5 | 795 | * @net: the applicable net namespace |
1da177e4 LT |
796 | * @ifindex: index of device |
797 | * | |
798 | * Search for an interface by index. Returns %NULL if the device | |
799 | * is not found or a pointer to the device. The device has not | |
800 | * had its reference counter increased so the caller must be careful | |
801 | * about locking. The caller must hold either the RTNL semaphore | |
802 | * or @dev_base_lock. | |
803 | */ | |
804 | ||
881d966b | 805 | struct net_device *__dev_get_by_index(struct net *net, int ifindex) |
1da177e4 | 806 | { |
0bd8d536 ED |
807 | struct net_device *dev; |
808 | struct hlist_head *head = dev_index_hash(net, ifindex); | |
1da177e4 | 809 | |
b67bfe0d | 810 | hlist_for_each_entry(dev, head, index_hlist) |
1da177e4 LT |
811 | if (dev->ifindex == ifindex) |
812 | return dev; | |
0bd8d536 | 813 | |
1da177e4 LT |
814 | return NULL; |
815 | } | |
d1b19dff | 816 | EXPORT_SYMBOL(__dev_get_by_index); |
1da177e4 | 817 | |
fb699dfd ED |
818 | /** |
819 | * dev_get_by_index_rcu - find a device by its ifindex | |
820 | * @net: the applicable net namespace | |
821 | * @ifindex: index of device | |
822 | * | |
823 | * Search for an interface by index. Returns %NULL if the device | |
824 | * is not found or a pointer to the device. The device has not | |
825 | * had its reference counter increased so the caller must be careful | |
826 | * about locking. The caller must hold RCU lock. | |
827 | */ | |
828 | ||
829 | struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex) | |
830 | { | |
fb699dfd ED |
831 | struct net_device *dev; |
832 | struct hlist_head *head = dev_index_hash(net, ifindex); | |
833 | ||
b67bfe0d | 834 | hlist_for_each_entry_rcu(dev, head, index_hlist) |
fb699dfd ED |
835 | if (dev->ifindex == ifindex) |
836 | return dev; | |
837 | ||
838 | return NULL; | |
839 | } | |
840 | EXPORT_SYMBOL(dev_get_by_index_rcu); | |
841 | ||
1da177e4 LT |
842 | |
843 | /** | |
844 | * dev_get_by_index - find a device by its ifindex | |
c4ea43c5 | 845 | * @net: the applicable net namespace |
1da177e4 LT |
846 | * @ifindex: index of device |
847 | * | |
848 | * Search for an interface by index. Returns NULL if the device | |
849 | * is not found or a pointer to the device. The device returned has | |
850 | * had a reference added and the pointer is safe until the user calls | |
851 | * dev_put to indicate they have finished with it. | |
852 | */ | |
853 | ||
881d966b | 854 | struct net_device *dev_get_by_index(struct net *net, int ifindex) |
1da177e4 LT |
855 | { |
856 | struct net_device *dev; | |
857 | ||
fb699dfd ED |
858 | rcu_read_lock(); |
859 | dev = dev_get_by_index_rcu(net, ifindex); | |
1da177e4 LT |
860 | if (dev) |
861 | dev_hold(dev); | |
fb699dfd | 862 | rcu_read_unlock(); |
1da177e4 LT |
863 | return dev; |
864 | } | |
d1b19dff | 865 | EXPORT_SYMBOL(dev_get_by_index); |
1da177e4 | 866 | |
5dbe7c17 NS |
867 | /** |
868 | * netdev_get_name - get a netdevice name, knowing its ifindex. | |
869 | * @net: network namespace | |
870 | * @name: a pointer to the buffer where the name will be stored. | |
871 | * @ifindex: the ifindex of the interface to get the name from. | |
872 | * | |
873 | * The use of raw_seqcount_begin() and cond_resched() before | |
874 | * retrying is required as we want to give the writers a chance | |
875 | * to complete when CONFIG_PREEMPT is not set. | |
876 | */ | |
877 | int netdev_get_name(struct net *net, char *name, int ifindex) | |
878 | { | |
879 | struct net_device *dev; | |
880 | unsigned int seq; | |
881 | ||
882 | retry: | |
883 | seq = raw_seqcount_begin(&devnet_rename_seq); | |
884 | rcu_read_lock(); | |
885 | dev = dev_get_by_index_rcu(net, ifindex); | |
886 | if (!dev) { | |
887 | rcu_read_unlock(); | |
888 | return -ENODEV; | |
889 | } | |
890 | ||
891 | strcpy(name, dev->name); | |
892 | rcu_read_unlock(); | |
893 | if (read_seqcount_retry(&devnet_rename_seq, seq)) { | |
894 | cond_resched(); | |
895 | goto retry; | |
896 | } | |
897 | ||
898 | return 0; | |
899 | } | |
900 | ||
1da177e4 | 901 | /** |
941666c2 | 902 | * dev_getbyhwaddr_rcu - find a device by its hardware address |
c4ea43c5 | 903 | * @net: the applicable net namespace |
1da177e4 LT |
904 | * @type: media type of device |
905 | * @ha: hardware address | |
906 | * | |
907 | * Search for an interface by MAC address. Returns NULL if the device | |
c506653d ED |
908 | * is not found or a pointer to the device. |
909 | * The caller must hold RCU or RTNL. | |
941666c2 | 910 | * The returned device has not had its ref count increased |
1da177e4 LT |
911 | * and the caller must therefore be careful about locking |
912 | * | |
1da177e4 LT |
913 | */ |
914 | ||
941666c2 ED |
915 | struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type, |
916 | const char *ha) | |
1da177e4 LT |
917 | { |
918 | struct net_device *dev; | |
919 | ||
941666c2 | 920 | for_each_netdev_rcu(net, dev) |
1da177e4 LT |
921 | if (dev->type == type && |
922 | !memcmp(dev->dev_addr, ha, dev->addr_len)) | |
7562f876 PE |
923 | return dev; |
924 | ||
925 | return NULL; | |
1da177e4 | 926 | } |
941666c2 | 927 | EXPORT_SYMBOL(dev_getbyhwaddr_rcu); |
cf309e3f | 928 | |
881d966b | 929 | struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type) |
1da177e4 LT |
930 | { |
931 | struct net_device *dev; | |
932 | ||
4e9cac2b | 933 | ASSERT_RTNL(); |
881d966b | 934 | for_each_netdev(net, dev) |
4e9cac2b | 935 | if (dev->type == type) |
7562f876 PE |
936 | return dev; |
937 | ||
938 | return NULL; | |
4e9cac2b | 939 | } |
4e9cac2b PM |
940 | EXPORT_SYMBOL(__dev_getfirstbyhwtype); |
941 | ||
881d966b | 942 | struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type) |
4e9cac2b | 943 | { |
99fe3c39 | 944 | struct net_device *dev, *ret = NULL; |
4e9cac2b | 945 | |
99fe3c39 ED |
946 | rcu_read_lock(); |
947 | for_each_netdev_rcu(net, dev) | |
948 | if (dev->type == type) { | |
949 | dev_hold(dev); | |
950 | ret = dev; | |
951 | break; | |
952 | } | |
953 | rcu_read_unlock(); | |
954 | return ret; | |
1da177e4 | 955 | } |
1da177e4 LT |
956 | EXPORT_SYMBOL(dev_getfirstbyhwtype); |
957 | ||
958 | /** | |
6c555490 | 959 | * __dev_get_by_flags - find any device with given flags |
c4ea43c5 | 960 | * @net: the applicable net namespace |
1da177e4 LT |
961 | * @if_flags: IFF_* values |
962 | * @mask: bitmask of bits in if_flags to check | |
963 | * | |
964 | * Search for any interface with the given flags. Returns NULL if a device | |
bb69ae04 | 965 | * is not found or a pointer to the device. Must be called inside |
6c555490 | 966 | * rtnl_lock(), and result refcount is unchanged. |
1da177e4 LT |
967 | */ |
968 | ||
6c555490 WC |
969 | struct net_device *__dev_get_by_flags(struct net *net, unsigned short if_flags, |
970 | unsigned short mask) | |
1da177e4 | 971 | { |
7562f876 | 972 | struct net_device *dev, *ret; |
1da177e4 | 973 | |
6c555490 WC |
974 | ASSERT_RTNL(); |
975 | ||
7562f876 | 976 | ret = NULL; |
6c555490 | 977 | for_each_netdev(net, dev) { |
1da177e4 | 978 | if (((dev->flags ^ if_flags) & mask) == 0) { |
7562f876 | 979 | ret = dev; |
1da177e4 LT |
980 | break; |
981 | } | |
982 | } | |
7562f876 | 983 | return ret; |
1da177e4 | 984 | } |
6c555490 | 985 | EXPORT_SYMBOL(__dev_get_by_flags); |
1da177e4 LT |
986 | |
987 | /** | |
988 | * dev_valid_name - check if name is okay for network device | |
989 | * @name: name string | |
990 | * | |
991 | * Network device names need to be valid file names to | |
c7fa9d18 DM |
992 | * to allow sysfs to work. We also disallow any kind of |
993 | * whitespace. | |
1da177e4 | 994 | */ |
95f050bf | 995 | bool dev_valid_name(const char *name) |
1da177e4 | 996 | { |
c7fa9d18 | 997 | if (*name == '\0') |
95f050bf | 998 | return false; |
b6fe17d6 | 999 | if (strlen(name) >= IFNAMSIZ) |
95f050bf | 1000 | return false; |
c7fa9d18 | 1001 | if (!strcmp(name, ".") || !strcmp(name, "..")) |
95f050bf | 1002 | return false; |
c7fa9d18 DM |
1003 | |
1004 | while (*name) { | |
a4176a93 | 1005 | if (*name == '/' || *name == ':' || isspace(*name)) |
95f050bf | 1006 | return false; |
c7fa9d18 DM |
1007 | name++; |
1008 | } | |
95f050bf | 1009 | return true; |
1da177e4 | 1010 | } |
d1b19dff | 1011 | EXPORT_SYMBOL(dev_valid_name); |
1da177e4 LT |
1012 | |
1013 | /** | |
b267b179 EB |
1014 | * __dev_alloc_name - allocate a name for a device |
1015 | * @net: network namespace to allocate the device name in | |
1da177e4 | 1016 | * @name: name format string |
b267b179 | 1017 | * @buf: scratch buffer and result name string |
1da177e4 LT |
1018 | * |
1019 | * Passed a format string - eg "lt%d" it will try and find a suitable | |
3041a069 SH |
1020 | * id. It scans list of devices to build up a free map, then chooses |
1021 | * the first empty slot. The caller must hold the dev_base or rtnl lock | |
1022 | * while allocating the name and adding the device in order to avoid | |
1023 | * duplicates. | |
1024 | * Limited to bits_per_byte * page size devices (ie 32K on most platforms). | |
1025 | * Returns the number of the unit assigned or a negative errno code. | |
1da177e4 LT |
1026 | */ |
1027 | ||
b267b179 | 1028 | static int __dev_alloc_name(struct net *net, const char *name, char *buf) |
1da177e4 LT |
1029 | { |
1030 | int i = 0; | |
1da177e4 LT |
1031 | const char *p; |
1032 | const int max_netdevices = 8*PAGE_SIZE; | |
cfcabdcc | 1033 | unsigned long *inuse; |
1da177e4 LT |
1034 | struct net_device *d; |
1035 | ||
1036 | p = strnchr(name, IFNAMSIZ-1, '%'); | |
1037 | if (p) { | |
1038 | /* | |
1039 | * Verify the string as this thing may have come from | |
1040 | * the user. There must be either one "%d" and no other "%" | |
1041 | * characters. | |
1042 | */ | |
1043 | if (p[1] != 'd' || strchr(p + 2, '%')) | |
1044 | return -EINVAL; | |
1045 | ||
1046 | /* Use one page as a bit array of possible slots */ | |
cfcabdcc | 1047 | inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC); |
1da177e4 LT |
1048 | if (!inuse) |
1049 | return -ENOMEM; | |
1050 | ||
881d966b | 1051 | for_each_netdev(net, d) { |
1da177e4 LT |
1052 | if (!sscanf(d->name, name, &i)) |
1053 | continue; | |
1054 | if (i < 0 || i >= max_netdevices) | |
1055 | continue; | |
1056 | ||
1057 | /* avoid cases where sscanf is not exact inverse of printf */ | |
b267b179 | 1058 | snprintf(buf, IFNAMSIZ, name, i); |
1da177e4 LT |
1059 | if (!strncmp(buf, d->name, IFNAMSIZ)) |
1060 | set_bit(i, inuse); | |
1061 | } | |
1062 | ||
1063 | i = find_first_zero_bit(inuse, max_netdevices); | |
1064 | free_page((unsigned long) inuse); | |
1065 | } | |
1066 | ||
d9031024 OP |
1067 | if (buf != name) |
1068 | snprintf(buf, IFNAMSIZ, name, i); | |
b267b179 | 1069 | if (!__dev_get_by_name(net, buf)) |
1da177e4 | 1070 | return i; |
1da177e4 LT |
1071 | |
1072 | /* It is possible to run out of possible slots | |
1073 | * when the name is long and there isn't enough space left | |
1074 | * for the digits, or if all bits are used. | |
1075 | */ | |
1076 | return -ENFILE; | |
1077 | } | |
1078 | ||
b267b179 EB |
1079 | /** |
1080 | * dev_alloc_name - allocate a name for a device | |
1081 | * @dev: device | |
1082 | * @name: name format string | |
1083 | * | |
1084 | * Passed a format string - eg "lt%d" it will try and find a suitable | |
1085 | * id. It scans list of devices to build up a free map, then chooses | |
1086 | * the first empty slot. The caller must hold the dev_base or rtnl lock | |
1087 | * while allocating the name and adding the device in order to avoid | |
1088 | * duplicates. | |
1089 | * Limited to bits_per_byte * page size devices (ie 32K on most platforms). | |
1090 | * Returns the number of the unit assigned or a negative errno code. | |
1091 | */ | |
1092 | ||
1093 | int dev_alloc_name(struct net_device *dev, const char *name) | |
1094 | { | |
1095 | char buf[IFNAMSIZ]; | |
1096 | struct net *net; | |
1097 | int ret; | |
1098 | ||
c346dca1 YH |
1099 | BUG_ON(!dev_net(dev)); |
1100 | net = dev_net(dev); | |
b267b179 EB |
1101 | ret = __dev_alloc_name(net, name, buf); |
1102 | if (ret >= 0) | |
1103 | strlcpy(dev->name, buf, IFNAMSIZ); | |
1104 | return ret; | |
1105 | } | |
d1b19dff | 1106 | EXPORT_SYMBOL(dev_alloc_name); |
b267b179 | 1107 | |
828de4f6 G |
1108 | static int dev_alloc_name_ns(struct net *net, |
1109 | struct net_device *dev, | |
1110 | const char *name) | |
d9031024 | 1111 | { |
828de4f6 G |
1112 | char buf[IFNAMSIZ]; |
1113 | int ret; | |
8ce6cebc | 1114 | |
828de4f6 G |
1115 | ret = __dev_alloc_name(net, name, buf); |
1116 | if (ret >= 0) | |
1117 | strlcpy(dev->name, buf, IFNAMSIZ); | |
1118 | return ret; | |
1119 | } | |
1120 | ||
1121 | static int dev_get_valid_name(struct net *net, | |
1122 | struct net_device *dev, | |
1123 | const char *name) | |
1124 | { | |
1125 | BUG_ON(!net); | |
8ce6cebc | 1126 | |
d9031024 OP |
1127 | if (!dev_valid_name(name)) |
1128 | return -EINVAL; | |
1129 | ||
1c5cae81 | 1130 | if (strchr(name, '%')) |
828de4f6 | 1131 | return dev_alloc_name_ns(net, dev, name); |
d9031024 OP |
1132 | else if (__dev_get_by_name(net, name)) |
1133 | return -EEXIST; | |
8ce6cebc DL |
1134 | else if (dev->name != name) |
1135 | strlcpy(dev->name, name, IFNAMSIZ); | |
d9031024 OP |
1136 | |
1137 | return 0; | |
1138 | } | |
1da177e4 LT |
1139 | |
1140 | /** | |
1141 | * dev_change_name - change name of a device | |
1142 | * @dev: device | |
1143 | * @newname: name (or format string) must be at least IFNAMSIZ | |
1144 | * | |
1145 | * Change name of a device, can pass format strings "eth%d". | |
1146 | * for wildcarding. | |
1147 | */ | |
cf04a4c7 | 1148 | int dev_change_name(struct net_device *dev, const char *newname) |
1da177e4 | 1149 | { |
238fa362 | 1150 | unsigned char old_assign_type; |
fcc5a03a | 1151 | char oldname[IFNAMSIZ]; |
1da177e4 | 1152 | int err = 0; |
fcc5a03a | 1153 | int ret; |
881d966b | 1154 | struct net *net; |
1da177e4 LT |
1155 | |
1156 | ASSERT_RTNL(); | |
c346dca1 | 1157 | BUG_ON(!dev_net(dev)); |
1da177e4 | 1158 | |
c346dca1 | 1159 | net = dev_net(dev); |
1da177e4 LT |
1160 | if (dev->flags & IFF_UP) |
1161 | return -EBUSY; | |
1162 | ||
30e6c9fa | 1163 | write_seqcount_begin(&devnet_rename_seq); |
c91f6df2 BH |
1164 | |
1165 | if (strncmp(newname, dev->name, IFNAMSIZ) == 0) { | |
30e6c9fa | 1166 | write_seqcount_end(&devnet_rename_seq); |
c8d90dca | 1167 | return 0; |
c91f6df2 | 1168 | } |
c8d90dca | 1169 | |
fcc5a03a HX |
1170 | memcpy(oldname, dev->name, IFNAMSIZ); |
1171 | ||
828de4f6 | 1172 | err = dev_get_valid_name(net, dev, newname); |
c91f6df2 | 1173 | if (err < 0) { |
30e6c9fa | 1174 | write_seqcount_end(&devnet_rename_seq); |
d9031024 | 1175 | return err; |
c91f6df2 | 1176 | } |
1da177e4 | 1177 | |
6fe82a39 VF |
1178 | if (oldname[0] && !strchr(oldname, '%')) |
1179 | netdev_info(dev, "renamed from %s\n", oldname); | |
1180 | ||
238fa362 TG |
1181 | old_assign_type = dev->name_assign_type; |
1182 | dev->name_assign_type = NET_NAME_RENAMED; | |
1183 | ||
fcc5a03a | 1184 | rollback: |
a1b3f594 EB |
1185 | ret = device_rename(&dev->dev, dev->name); |
1186 | if (ret) { | |
1187 | memcpy(dev->name, oldname, IFNAMSIZ); | |
238fa362 | 1188 | dev->name_assign_type = old_assign_type; |
30e6c9fa | 1189 | write_seqcount_end(&devnet_rename_seq); |
a1b3f594 | 1190 | return ret; |
dcc99773 | 1191 | } |
7f988eab | 1192 | |
30e6c9fa | 1193 | write_seqcount_end(&devnet_rename_seq); |
c91f6df2 | 1194 | |
5bb025fa VF |
1195 | netdev_adjacent_rename_links(dev, oldname); |
1196 | ||
7f988eab | 1197 | write_lock_bh(&dev_base_lock); |
372b2312 | 1198 | hlist_del_rcu(&dev->name_hlist); |
72c9528b ED |
1199 | write_unlock_bh(&dev_base_lock); |
1200 | ||
1201 | synchronize_rcu(); | |
1202 | ||
1203 | write_lock_bh(&dev_base_lock); | |
1204 | hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name)); | |
7f988eab HX |
1205 | write_unlock_bh(&dev_base_lock); |
1206 | ||
056925ab | 1207 | ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev); |
fcc5a03a HX |
1208 | ret = notifier_to_errno(ret); |
1209 | ||
1210 | if (ret) { | |
91e9c07b ED |
1211 | /* err >= 0 after dev_alloc_name() or stores the first errno */ |
1212 | if (err >= 0) { | |
fcc5a03a | 1213 | err = ret; |
30e6c9fa | 1214 | write_seqcount_begin(&devnet_rename_seq); |
fcc5a03a | 1215 | memcpy(dev->name, oldname, IFNAMSIZ); |
5bb025fa | 1216 | memcpy(oldname, newname, IFNAMSIZ); |
238fa362 TG |
1217 | dev->name_assign_type = old_assign_type; |
1218 | old_assign_type = NET_NAME_RENAMED; | |
fcc5a03a | 1219 | goto rollback; |
91e9c07b | 1220 | } else { |
7b6cd1ce | 1221 | pr_err("%s: name change rollback failed: %d\n", |
91e9c07b | 1222 | dev->name, ret); |
fcc5a03a HX |
1223 | } |
1224 | } | |
1da177e4 LT |
1225 | |
1226 | return err; | |
1227 | } | |
1228 | ||
0b815a1a SH |
1229 | /** |
1230 | * dev_set_alias - change ifalias of a device | |
1231 | * @dev: device | |
1232 | * @alias: name up to IFALIASZ | |
f0db275a | 1233 | * @len: limit of bytes to copy from info |
0b815a1a SH |
1234 | * |
1235 | * Set ifalias for a device, | |
1236 | */ | |
1237 | int dev_set_alias(struct net_device *dev, const char *alias, size_t len) | |
1238 | { | |
7364e445 AK |
1239 | char *new_ifalias; |
1240 | ||
0b815a1a SH |
1241 | ASSERT_RTNL(); |
1242 | ||
1243 | if (len >= IFALIASZ) | |
1244 | return -EINVAL; | |
1245 | ||
96ca4a2c | 1246 | if (!len) { |
388dfc2d SK |
1247 | kfree(dev->ifalias); |
1248 | dev->ifalias = NULL; | |
96ca4a2c OH |
1249 | return 0; |
1250 | } | |
1251 | ||
7364e445 AK |
1252 | new_ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL); |
1253 | if (!new_ifalias) | |
0b815a1a | 1254 | return -ENOMEM; |
7364e445 | 1255 | dev->ifalias = new_ifalias; |
0b815a1a SH |
1256 | |
1257 | strlcpy(dev->ifalias, alias, len+1); | |
1258 | return len; | |
1259 | } | |
1260 | ||
1261 | ||
d8a33ac4 | 1262 | /** |
3041a069 | 1263 | * netdev_features_change - device changes features |
d8a33ac4 SH |
1264 | * @dev: device to cause notification |
1265 | * | |
1266 | * Called to indicate a device has changed features. | |
1267 | */ | |
1268 | void netdev_features_change(struct net_device *dev) | |
1269 | { | |
056925ab | 1270 | call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev); |
d8a33ac4 SH |
1271 | } |
1272 | EXPORT_SYMBOL(netdev_features_change); | |
1273 | ||
1da177e4 LT |
1274 | /** |
1275 | * netdev_state_change - device changes state | |
1276 | * @dev: device to cause notification | |
1277 | * | |
1278 | * Called to indicate a device has changed state. This function calls | |
1279 | * the notifier chains for netdev_chain and sends a NEWLINK message | |
1280 | * to the routing socket. | |
1281 | */ | |
1282 | void netdev_state_change(struct net_device *dev) | |
1283 | { | |
1284 | if (dev->flags & IFF_UP) { | |
54951194 LP |
1285 | struct netdev_notifier_change_info change_info; |
1286 | ||
1287 | change_info.flags_changed = 0; | |
1288 | call_netdevice_notifiers_info(NETDEV_CHANGE, dev, | |
1289 | &change_info.info); | |
7f294054 | 1290 | rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL); |
1da177e4 LT |
1291 | } |
1292 | } | |
d1b19dff | 1293 | EXPORT_SYMBOL(netdev_state_change); |
1da177e4 | 1294 | |
ee89bab1 | 1295 | /** |
722c9a0c | 1296 | * netdev_notify_peers - notify network peers about existence of @dev |
1297 | * @dev: network device | |
ee89bab1 AW |
1298 | * |
1299 | * Generate traffic such that interested network peers are aware of | |
1300 | * @dev, such as by generating a gratuitous ARP. This may be used when | |
1301 | * a device wants to inform the rest of the network about some sort of | |
1302 | * reconfiguration such as a failover event or virtual machine | |
1303 | * migration. | |
1304 | */ | |
1305 | void netdev_notify_peers(struct net_device *dev) | |
c1da4ac7 | 1306 | { |
ee89bab1 AW |
1307 | rtnl_lock(); |
1308 | call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, dev); | |
37c343b4 | 1309 | call_netdevice_notifiers(NETDEV_RESEND_IGMP, dev); |
ee89bab1 | 1310 | rtnl_unlock(); |
c1da4ac7 | 1311 | } |
ee89bab1 | 1312 | EXPORT_SYMBOL(netdev_notify_peers); |
c1da4ac7 | 1313 | |
bd380811 | 1314 | static int __dev_open(struct net_device *dev) |
1da177e4 | 1315 | { |
d314774c | 1316 | const struct net_device_ops *ops = dev->netdev_ops; |
3b8bcfd5 | 1317 | int ret; |
1da177e4 | 1318 | |
e46b66bc BH |
1319 | ASSERT_RTNL(); |
1320 | ||
1da177e4 LT |
1321 | if (!netif_device_present(dev)) |
1322 | return -ENODEV; | |
1323 | ||
ca99ca14 NH |
1324 | /* Block netpoll from trying to do any rx path servicing. |
1325 | * If we don't do this there is a chance ndo_poll_controller | |
1326 | * or ndo_poll may be running while we open the device | |
1327 | */ | |
66b5552f | 1328 | netpoll_poll_disable(dev); |
ca99ca14 | 1329 | |
3b8bcfd5 JB |
1330 | ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev); |
1331 | ret = notifier_to_errno(ret); | |
1332 | if (ret) | |
1333 | return ret; | |
1334 | ||
1da177e4 | 1335 | set_bit(__LINK_STATE_START, &dev->state); |
bada339b | 1336 | |
d314774c SH |
1337 | if (ops->ndo_validate_addr) |
1338 | ret = ops->ndo_validate_addr(dev); | |
bada339b | 1339 | |
d314774c SH |
1340 | if (!ret && ops->ndo_open) |
1341 | ret = ops->ndo_open(dev); | |
1da177e4 | 1342 | |
66b5552f | 1343 | netpoll_poll_enable(dev); |
ca99ca14 | 1344 | |
bada339b JG |
1345 | if (ret) |
1346 | clear_bit(__LINK_STATE_START, &dev->state); | |
1347 | else { | |
1da177e4 | 1348 | dev->flags |= IFF_UP; |
4417da66 | 1349 | dev_set_rx_mode(dev); |
1da177e4 | 1350 | dev_activate(dev); |
7bf23575 | 1351 | add_device_randomness(dev->dev_addr, dev->addr_len); |
1da177e4 | 1352 | } |
bada339b | 1353 | |
1da177e4 LT |
1354 | return ret; |
1355 | } | |
1356 | ||
1357 | /** | |
bd380811 PM |
1358 | * dev_open - prepare an interface for use. |
1359 | * @dev: device to open | |
1da177e4 | 1360 | * |
bd380811 PM |
1361 | * Takes a device from down to up state. The device's private open |
1362 | * function is invoked and then the multicast lists are loaded. Finally | |
1363 | * the device is moved into the up state and a %NETDEV_UP message is | |
1364 | * sent to the netdev notifier chain. | |
1365 | * | |
1366 | * Calling this function on an active interface is a nop. On a failure | |
1367 | * a negative errno code is returned. | |
1da177e4 | 1368 | */ |
bd380811 PM |
1369 | int dev_open(struct net_device *dev) |
1370 | { | |
1371 | int ret; | |
1372 | ||
bd380811 PM |
1373 | if (dev->flags & IFF_UP) |
1374 | return 0; | |
1375 | ||
bd380811 PM |
1376 | ret = __dev_open(dev); |
1377 | if (ret < 0) | |
1378 | return ret; | |
1379 | ||
7f294054 | 1380 | rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING, GFP_KERNEL); |
bd380811 PM |
1381 | call_netdevice_notifiers(NETDEV_UP, dev); |
1382 | ||
1383 | return ret; | |
1384 | } | |
1385 | EXPORT_SYMBOL(dev_open); | |
1386 | ||
44345724 | 1387 | static int __dev_close_many(struct list_head *head) |
1da177e4 | 1388 | { |
44345724 | 1389 | struct net_device *dev; |
e46b66bc | 1390 | |
bd380811 | 1391 | ASSERT_RTNL(); |
9d5010db DM |
1392 | might_sleep(); |
1393 | ||
5cde2829 | 1394 | list_for_each_entry(dev, head, close_list) { |
3f4df206 | 1395 | /* Temporarily disable netpoll until the interface is down */ |
66b5552f | 1396 | netpoll_poll_disable(dev); |
3f4df206 | 1397 | |
44345724 | 1398 | call_netdevice_notifiers(NETDEV_GOING_DOWN, dev); |
1da177e4 | 1399 | |
44345724 | 1400 | clear_bit(__LINK_STATE_START, &dev->state); |
1da177e4 | 1401 | |
44345724 OP |
1402 | /* Synchronize to scheduled poll. We cannot touch poll list, it |
1403 | * can be even on different cpu. So just clear netif_running(). | |
1404 | * | |
1405 | * dev->stop() will invoke napi_disable() on all of it's | |
1406 | * napi_struct instances on this device. | |
1407 | */ | |
4e857c58 | 1408 | smp_mb__after_atomic(); /* Commit netif_running(). */ |
44345724 | 1409 | } |
1da177e4 | 1410 | |
44345724 | 1411 | dev_deactivate_many(head); |
d8b2a4d2 | 1412 | |
5cde2829 | 1413 | list_for_each_entry(dev, head, close_list) { |
44345724 | 1414 | const struct net_device_ops *ops = dev->netdev_ops; |
1da177e4 | 1415 | |
44345724 OP |
1416 | /* |
1417 | * Call the device specific close. This cannot fail. | |
1418 | * Only if device is UP | |
1419 | * | |
1420 | * We allow it to be called even after a DETACH hot-plug | |
1421 | * event. | |
1422 | */ | |
1423 | if (ops->ndo_stop) | |
1424 | ops->ndo_stop(dev); | |
1425 | ||
44345724 | 1426 | dev->flags &= ~IFF_UP; |
66b5552f | 1427 | netpoll_poll_enable(dev); |
44345724 OP |
1428 | } |
1429 | ||
1430 | return 0; | |
1431 | } | |
1432 | ||
1433 | static int __dev_close(struct net_device *dev) | |
1434 | { | |
f87e6f47 | 1435 | int retval; |
44345724 OP |
1436 | LIST_HEAD(single); |
1437 | ||
5cde2829 | 1438 | list_add(&dev->close_list, &single); |
f87e6f47 LT |
1439 | retval = __dev_close_many(&single); |
1440 | list_del(&single); | |
ca99ca14 | 1441 | |
f87e6f47 | 1442 | return retval; |
44345724 OP |
1443 | } |
1444 | ||
99c4a26a | 1445 | int dev_close_many(struct list_head *head, bool unlink) |
44345724 OP |
1446 | { |
1447 | struct net_device *dev, *tmp; | |
1da177e4 | 1448 | |
5cde2829 EB |
1449 | /* Remove the devices that don't need to be closed */ |
1450 | list_for_each_entry_safe(dev, tmp, head, close_list) | |
44345724 | 1451 | if (!(dev->flags & IFF_UP)) |
5cde2829 | 1452 | list_del_init(&dev->close_list); |
44345724 OP |
1453 | |
1454 | __dev_close_many(head); | |
1da177e4 | 1455 | |
5cde2829 | 1456 | list_for_each_entry_safe(dev, tmp, head, close_list) { |
7f294054 | 1457 | rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING, GFP_KERNEL); |
44345724 | 1458 | call_netdevice_notifiers(NETDEV_DOWN, dev); |
99c4a26a DM |
1459 | if (unlink) |
1460 | list_del_init(&dev->close_list); | |
44345724 | 1461 | } |
bd380811 PM |
1462 | |
1463 | return 0; | |
1464 | } | |
99c4a26a | 1465 | EXPORT_SYMBOL(dev_close_many); |
bd380811 PM |
1466 | |
1467 | /** | |
1468 | * dev_close - shutdown an interface. | |
1469 | * @dev: device to shutdown | |
1470 | * | |
1471 | * This function moves an active device into down state. A | |
1472 | * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device | |
1473 | * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier | |
1474 | * chain. | |
1475 | */ | |
1476 | int dev_close(struct net_device *dev) | |
1477 | { | |
e14a5993 ED |
1478 | if (dev->flags & IFF_UP) { |
1479 | LIST_HEAD(single); | |
1da177e4 | 1480 | |
5cde2829 | 1481 | list_add(&dev->close_list, &single); |
99c4a26a | 1482 | dev_close_many(&single, true); |
e14a5993 ED |
1483 | list_del(&single); |
1484 | } | |
da6e378b | 1485 | return 0; |
1da177e4 | 1486 | } |
d1b19dff | 1487 | EXPORT_SYMBOL(dev_close); |
1da177e4 LT |
1488 | |
1489 | ||
0187bdfb BH |
1490 | /** |
1491 | * dev_disable_lro - disable Large Receive Offload on a device | |
1492 | * @dev: device | |
1493 | * | |
1494 | * Disable Large Receive Offload (LRO) on a net device. Must be | |
1495 | * called under RTNL. This is needed if received packets may be | |
1496 | * forwarded to another interface. | |
1497 | */ | |
1498 | void dev_disable_lro(struct net_device *dev) | |
1499 | { | |
fbe168ba MK |
1500 | struct net_device *lower_dev; |
1501 | struct list_head *iter; | |
529d0489 | 1502 | |
bc5787c6 MM |
1503 | dev->wanted_features &= ~NETIF_F_LRO; |
1504 | netdev_update_features(dev); | |
27660515 | 1505 | |
22d5969f MM |
1506 | if (unlikely(dev->features & NETIF_F_LRO)) |
1507 | netdev_WARN(dev, "failed to disable LRO!\n"); | |
fbe168ba MK |
1508 | |
1509 | netdev_for_each_lower_dev(dev, lower_dev, iter) | |
1510 | dev_disable_lro(lower_dev); | |
0187bdfb BH |
1511 | } |
1512 | EXPORT_SYMBOL(dev_disable_lro); | |
1513 | ||
351638e7 JP |
1514 | static int call_netdevice_notifier(struct notifier_block *nb, unsigned long val, |
1515 | struct net_device *dev) | |
1516 | { | |
1517 | struct netdev_notifier_info info; | |
1518 | ||
1519 | netdev_notifier_info_init(&info, dev); | |
1520 | return nb->notifier_call(nb, val, &info); | |
1521 | } | |
0187bdfb | 1522 | |
881d966b EB |
1523 | static int dev_boot_phase = 1; |
1524 | ||
1da177e4 | 1525 | /** |
722c9a0c | 1526 | * register_netdevice_notifier - register a network notifier block |
1527 | * @nb: notifier | |
1da177e4 | 1528 | * |
722c9a0c | 1529 | * Register a notifier to be called when network device events occur. |
1530 | * The notifier passed is linked into the kernel structures and must | |
1531 | * not be reused until it has been unregistered. A negative errno code | |
1532 | * is returned on a failure. | |
1da177e4 | 1533 | * |
722c9a0c | 1534 | * When registered all registration and up events are replayed |
1535 | * to the new notifier to allow device to have a race free | |
1536 | * view of the network device list. | |
1da177e4 LT |
1537 | */ |
1538 | ||
1539 | int register_netdevice_notifier(struct notifier_block *nb) | |
1540 | { | |
1541 | struct net_device *dev; | |
fcc5a03a | 1542 | struct net_device *last; |
881d966b | 1543 | struct net *net; |
1da177e4 LT |
1544 | int err; |
1545 | ||
1546 | rtnl_lock(); | |
f07d5b94 | 1547 | err = raw_notifier_chain_register(&netdev_chain, nb); |
fcc5a03a HX |
1548 | if (err) |
1549 | goto unlock; | |
881d966b EB |
1550 | if (dev_boot_phase) |
1551 | goto unlock; | |
1552 | for_each_net(net) { | |
1553 | for_each_netdev(net, dev) { | |
351638e7 | 1554 | err = call_netdevice_notifier(nb, NETDEV_REGISTER, dev); |
881d966b EB |
1555 | err = notifier_to_errno(err); |
1556 | if (err) | |
1557 | goto rollback; | |
1558 | ||
1559 | if (!(dev->flags & IFF_UP)) | |
1560 | continue; | |
1da177e4 | 1561 | |
351638e7 | 1562 | call_netdevice_notifier(nb, NETDEV_UP, dev); |
881d966b | 1563 | } |
1da177e4 | 1564 | } |
fcc5a03a HX |
1565 | |
1566 | unlock: | |
1da177e4 LT |
1567 | rtnl_unlock(); |
1568 | return err; | |
fcc5a03a HX |
1569 | |
1570 | rollback: | |
1571 | last = dev; | |
881d966b EB |
1572 | for_each_net(net) { |
1573 | for_each_netdev(net, dev) { | |
1574 | if (dev == last) | |
8f891489 | 1575 | goto outroll; |
fcc5a03a | 1576 | |
881d966b | 1577 | if (dev->flags & IFF_UP) { |
351638e7 JP |
1578 | call_netdevice_notifier(nb, NETDEV_GOING_DOWN, |
1579 | dev); | |
1580 | call_netdevice_notifier(nb, NETDEV_DOWN, dev); | |
881d966b | 1581 | } |
351638e7 | 1582 | call_netdevice_notifier(nb, NETDEV_UNREGISTER, dev); |
fcc5a03a | 1583 | } |
fcc5a03a | 1584 | } |
c67625a1 | 1585 | |
8f891489 | 1586 | outroll: |
c67625a1 | 1587 | raw_notifier_chain_unregister(&netdev_chain, nb); |
fcc5a03a | 1588 | goto unlock; |
1da177e4 | 1589 | } |
d1b19dff | 1590 | EXPORT_SYMBOL(register_netdevice_notifier); |
1da177e4 LT |
1591 | |
1592 | /** | |
722c9a0c | 1593 | * unregister_netdevice_notifier - unregister a network notifier block |
1594 | * @nb: notifier | |
1da177e4 | 1595 | * |
722c9a0c | 1596 | * Unregister a notifier previously registered by |
1597 | * register_netdevice_notifier(). The notifier is unlinked into the | |
1598 | * kernel structures and may then be reused. A negative errno code | |
1599 | * is returned on a failure. | |
7d3d43da | 1600 | * |
722c9a0c | 1601 | * After unregistering unregister and down device events are synthesized |
1602 | * for all devices on the device list to the removed notifier to remove | |
1603 | * the need for special case cleanup code. | |
1da177e4 LT |
1604 | */ |
1605 | ||
1606 | int unregister_netdevice_notifier(struct notifier_block *nb) | |
1607 | { | |
7d3d43da EB |
1608 | struct net_device *dev; |
1609 | struct net *net; | |
9f514950 HX |
1610 | int err; |
1611 | ||
1612 | rtnl_lock(); | |
f07d5b94 | 1613 | err = raw_notifier_chain_unregister(&netdev_chain, nb); |
7d3d43da EB |
1614 | if (err) |
1615 | goto unlock; | |
1616 | ||
1617 | for_each_net(net) { | |
1618 | for_each_netdev(net, dev) { | |
1619 | if (dev->flags & IFF_UP) { | |
351638e7 JP |
1620 | call_netdevice_notifier(nb, NETDEV_GOING_DOWN, |
1621 | dev); | |
1622 | call_netdevice_notifier(nb, NETDEV_DOWN, dev); | |
7d3d43da | 1623 | } |
351638e7 | 1624 | call_netdevice_notifier(nb, NETDEV_UNREGISTER, dev); |
7d3d43da EB |
1625 | } |
1626 | } | |
1627 | unlock: | |
9f514950 HX |
1628 | rtnl_unlock(); |
1629 | return err; | |
1da177e4 | 1630 | } |
d1b19dff | 1631 | EXPORT_SYMBOL(unregister_netdevice_notifier); |
1da177e4 | 1632 | |
351638e7 JP |
1633 | /** |
1634 | * call_netdevice_notifiers_info - call all network notifier blocks | |
1635 | * @val: value passed unmodified to notifier function | |
1636 | * @dev: net_device pointer passed unmodified to notifier function | |
1637 | * @info: notifier information data | |
1638 | * | |
1639 | * Call all network notifier blocks. Parameters and return value | |
1640 | * are as for raw_notifier_call_chain(). | |
1641 | */ | |
1642 | ||
1d143d9f | 1643 | static int call_netdevice_notifiers_info(unsigned long val, |
1644 | struct net_device *dev, | |
1645 | struct netdev_notifier_info *info) | |
351638e7 JP |
1646 | { |
1647 | ASSERT_RTNL(); | |
1648 | netdev_notifier_info_init(info, dev); | |
1649 | return raw_notifier_call_chain(&netdev_chain, val, info); | |
1650 | } | |
351638e7 | 1651 | |
1da177e4 LT |
1652 | /** |
1653 | * call_netdevice_notifiers - call all network notifier blocks | |
1654 | * @val: value passed unmodified to notifier function | |
c4ea43c5 | 1655 | * @dev: net_device pointer passed unmodified to notifier function |
1da177e4 LT |
1656 | * |
1657 | * Call all network notifier blocks. Parameters and return value | |
f07d5b94 | 1658 | * are as for raw_notifier_call_chain(). |
1da177e4 LT |
1659 | */ |
1660 | ||
ad7379d4 | 1661 | int call_netdevice_notifiers(unsigned long val, struct net_device *dev) |
1da177e4 | 1662 | { |
351638e7 JP |
1663 | struct netdev_notifier_info info; |
1664 | ||
1665 | return call_netdevice_notifiers_info(val, dev, &info); | |
1da177e4 | 1666 | } |
edf947f1 | 1667 | EXPORT_SYMBOL(call_netdevice_notifiers); |
1da177e4 | 1668 | |
1cf51900 | 1669 | #ifdef CONFIG_NET_INGRESS |
4577139b DB |
1670 | static struct static_key ingress_needed __read_mostly; |
1671 | ||
1672 | void net_inc_ingress_queue(void) | |
1673 | { | |
1674 | static_key_slow_inc(&ingress_needed); | |
1675 | } | |
1676 | EXPORT_SYMBOL_GPL(net_inc_ingress_queue); | |
1677 | ||
1678 | void net_dec_ingress_queue(void) | |
1679 | { | |
1680 | static_key_slow_dec(&ingress_needed); | |
1681 | } | |
1682 | EXPORT_SYMBOL_GPL(net_dec_ingress_queue); | |
1683 | #endif | |
1684 | ||
1f211a1b DB |
1685 | #ifdef CONFIG_NET_EGRESS |
1686 | static struct static_key egress_needed __read_mostly; | |
1687 | ||
1688 | void net_inc_egress_queue(void) | |
1689 | { | |
1690 | static_key_slow_inc(&egress_needed); | |
1691 | } | |
1692 | EXPORT_SYMBOL_GPL(net_inc_egress_queue); | |
1693 | ||
1694 | void net_dec_egress_queue(void) | |
1695 | { | |
1696 | static_key_slow_dec(&egress_needed); | |
1697 | } | |
1698 | EXPORT_SYMBOL_GPL(net_dec_egress_queue); | |
1699 | #endif | |
1700 | ||
c5905afb | 1701 | static struct static_key netstamp_needed __read_mostly; |
b90e5794 | 1702 | #ifdef HAVE_JUMP_LABEL |
b90e5794 | 1703 | static atomic_t netstamp_needed_deferred; |
13baa00a | 1704 | static atomic_t netstamp_wanted; |
5fa8bbda | 1705 | static void netstamp_clear(struct work_struct *work) |
1da177e4 | 1706 | { |
b90e5794 | 1707 | int deferred = atomic_xchg(&netstamp_needed_deferred, 0); |
13baa00a | 1708 | int wanted; |
b90e5794 | 1709 | |
13baa00a ED |
1710 | wanted = atomic_add_return(deferred, &netstamp_wanted); |
1711 | if (wanted > 0) | |
1712 | static_key_enable(&netstamp_needed); | |
1713 | else | |
1714 | static_key_disable(&netstamp_needed); | |
5fa8bbda ED |
1715 | } |
1716 | static DECLARE_WORK(netstamp_work, netstamp_clear); | |
b90e5794 | 1717 | #endif |
5fa8bbda ED |
1718 | |
1719 | void net_enable_timestamp(void) | |
1720 | { | |
13baa00a ED |
1721 | #ifdef HAVE_JUMP_LABEL |
1722 | int wanted; | |
1723 | ||
1724 | while (1) { | |
1725 | wanted = atomic_read(&netstamp_wanted); | |
1726 | if (wanted <= 0) | |
1727 | break; | |
1728 | if (atomic_cmpxchg(&netstamp_wanted, wanted, wanted + 1) == wanted) | |
1729 | return; | |
1730 | } | |
1731 | atomic_inc(&netstamp_needed_deferred); | |
1732 | schedule_work(&netstamp_work); | |
1733 | #else | |
c5905afb | 1734 | static_key_slow_inc(&netstamp_needed); |
13baa00a | 1735 | #endif |
1da177e4 | 1736 | } |
d1b19dff | 1737 | EXPORT_SYMBOL(net_enable_timestamp); |
1da177e4 LT |
1738 | |
1739 | void net_disable_timestamp(void) | |
1740 | { | |
b90e5794 | 1741 | #ifdef HAVE_JUMP_LABEL |
13baa00a ED |
1742 | int wanted; |
1743 | ||
1744 | while (1) { | |
1745 | wanted = atomic_read(&netstamp_wanted); | |
1746 | if (wanted <= 1) | |
1747 | break; | |
1748 | if (atomic_cmpxchg(&netstamp_wanted, wanted, wanted - 1) == wanted) | |
1749 | return; | |
1750 | } | |
1751 | atomic_dec(&netstamp_needed_deferred); | |
5fa8bbda ED |
1752 | schedule_work(&netstamp_work); |
1753 | #else | |
c5905afb | 1754 | static_key_slow_dec(&netstamp_needed); |
5fa8bbda | 1755 | #endif |
1da177e4 | 1756 | } |
d1b19dff | 1757 | EXPORT_SYMBOL(net_disable_timestamp); |
1da177e4 | 1758 | |
3b098e2d | 1759 | static inline void net_timestamp_set(struct sk_buff *skb) |
1da177e4 | 1760 | { |
2456e855 | 1761 | skb->tstamp = 0; |
c5905afb | 1762 | if (static_key_false(&netstamp_needed)) |
a61bbcf2 | 1763 | __net_timestamp(skb); |
1da177e4 LT |
1764 | } |
1765 | ||
588f0330 | 1766 | #define net_timestamp_check(COND, SKB) \ |
c5905afb | 1767 | if (static_key_false(&netstamp_needed)) { \ |
2456e855 | 1768 | if ((COND) && !(SKB)->tstamp) \ |
588f0330 ED |
1769 | __net_timestamp(SKB); \ |
1770 | } \ | |
3b098e2d | 1771 | |
f4b05d27 | 1772 | bool is_skb_forwardable(const struct net_device *dev, const struct sk_buff *skb) |
79b569f0 DL |
1773 | { |
1774 | unsigned int len; | |
1775 | ||
1776 | if (!(dev->flags & IFF_UP)) | |
1777 | return false; | |
1778 | ||
1779 | len = dev->mtu + dev->hard_header_len + VLAN_HLEN; | |
1780 | if (skb->len <= len) | |
1781 | return true; | |
1782 | ||
1783 | /* if TSO is enabled, we don't care about the length as the packet | |
1784 | * could be forwarded without being segmented before | |
1785 | */ | |
1786 | if (skb_is_gso(skb)) | |
1787 | return true; | |
1788 | ||
1789 | return false; | |
1790 | } | |
1ee481fb | 1791 | EXPORT_SYMBOL_GPL(is_skb_forwardable); |
79b569f0 | 1792 | |
a0265d28 HX |
1793 | int __dev_forward_skb(struct net_device *dev, struct sk_buff *skb) |
1794 | { | |
4e3264d2 | 1795 | int ret = ____dev_forward_skb(dev, skb); |
a0265d28 | 1796 | |
4e3264d2 MKL |
1797 | if (likely(!ret)) { |
1798 | skb->protocol = eth_type_trans(skb, dev); | |
1799 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); | |
1800 | } | |
a0265d28 | 1801 | |
4e3264d2 | 1802 | return ret; |
a0265d28 HX |
1803 | } |
1804 | EXPORT_SYMBOL_GPL(__dev_forward_skb); | |
1805 | ||
44540960 AB |
1806 | /** |
1807 | * dev_forward_skb - loopback an skb to another netif | |
1808 | * | |
1809 | * @dev: destination network device | |
1810 | * @skb: buffer to forward | |
1811 | * | |
1812 | * return values: | |
1813 | * NET_RX_SUCCESS (no congestion) | |
6ec82562 | 1814 | * NET_RX_DROP (packet was dropped, but freed) |
44540960 AB |
1815 | * |
1816 | * dev_forward_skb can be used for injecting an skb from the | |
1817 | * start_xmit function of one device into the receive queue | |
1818 | * of another device. | |
1819 | * | |
1820 | * The receiving device may be in another namespace, so | |
1821 | * we have to clear all information in the skb that could | |
1822 | * impact namespace isolation. | |
1823 | */ | |
1824 | int dev_forward_skb(struct net_device *dev, struct sk_buff *skb) | |
1825 | { | |
a0265d28 | 1826 | return __dev_forward_skb(dev, skb) ?: netif_rx_internal(skb); |
44540960 AB |
1827 | } |
1828 | EXPORT_SYMBOL_GPL(dev_forward_skb); | |
1829 | ||
71d9dec2 CG |
1830 | static inline int deliver_skb(struct sk_buff *skb, |
1831 | struct packet_type *pt_prev, | |
1832 | struct net_device *orig_dev) | |
1833 | { | |
1080e512 MT |
1834 | if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC))) |
1835 | return -ENOMEM; | |
71d9dec2 CG |
1836 | atomic_inc(&skb->users); |
1837 | return pt_prev->func(skb, skb->dev, pt_prev, orig_dev); | |
1838 | } | |
1839 | ||
7866a621 SN |
1840 | static inline void deliver_ptype_list_skb(struct sk_buff *skb, |
1841 | struct packet_type **pt, | |
fbcb2170 JP |
1842 | struct net_device *orig_dev, |
1843 | __be16 type, | |
7866a621 SN |
1844 | struct list_head *ptype_list) |
1845 | { | |
1846 | struct packet_type *ptype, *pt_prev = *pt; | |
1847 | ||
1848 | list_for_each_entry_rcu(ptype, ptype_list, list) { | |
1849 | if (ptype->type != type) | |
1850 | continue; | |
1851 | if (pt_prev) | |
fbcb2170 | 1852 | deliver_skb(skb, pt_prev, orig_dev); |
7866a621 SN |
1853 | pt_prev = ptype; |
1854 | } | |
1855 | *pt = pt_prev; | |
1856 | } | |
1857 | ||
c0de08d0 EL |
1858 | static inline bool skb_loop_sk(struct packet_type *ptype, struct sk_buff *skb) |
1859 | { | |
a3d744e9 | 1860 | if (!ptype->af_packet_priv || !skb->sk) |
c0de08d0 EL |
1861 | return false; |
1862 | ||
1863 | if (ptype->id_match) | |
1864 | return ptype->id_match(ptype, skb->sk); | |
1865 | else if ((struct sock *)ptype->af_packet_priv == skb->sk) | |
1866 | return true; | |
1867 | ||
1868 | return false; | |
1869 | } | |
1870 | ||
1da177e4 LT |
1871 | /* |
1872 | * Support routine. Sends outgoing frames to any network | |
1873 | * taps currently in use. | |
1874 | */ | |
1875 | ||
74b20582 | 1876 | void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
1877 | { |
1878 | struct packet_type *ptype; | |
71d9dec2 CG |
1879 | struct sk_buff *skb2 = NULL; |
1880 | struct packet_type *pt_prev = NULL; | |
7866a621 | 1881 | struct list_head *ptype_list = &ptype_all; |
a61bbcf2 | 1882 | |
1da177e4 | 1883 | rcu_read_lock(); |
7866a621 SN |
1884 | again: |
1885 | list_for_each_entry_rcu(ptype, ptype_list, list) { | |
1da177e4 LT |
1886 | /* Never send packets back to the socket |
1887 | * they originated from - MvS (miquels@drinkel.ow.org) | |
1888 | */ | |
7866a621 SN |
1889 | if (skb_loop_sk(ptype, skb)) |
1890 | continue; | |
71d9dec2 | 1891 | |
7866a621 SN |
1892 | if (pt_prev) { |
1893 | deliver_skb(skb2, pt_prev, skb->dev); | |
1894 | pt_prev = ptype; | |
1895 | continue; | |
1896 | } | |
1da177e4 | 1897 | |
7866a621 SN |
1898 | /* need to clone skb, done only once */ |
1899 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1900 | if (!skb2) | |
1901 | goto out_unlock; | |
70978182 | 1902 | |
7866a621 | 1903 | net_timestamp_set(skb2); |
1da177e4 | 1904 | |
7866a621 SN |
1905 | /* skb->nh should be correctly |
1906 | * set by sender, so that the second statement is | |
1907 | * just protection against buggy protocols. | |
1908 | */ | |
1909 | skb_reset_mac_header(skb2); | |
1910 | ||
1911 | if (skb_network_header(skb2) < skb2->data || | |
1912 | skb_network_header(skb2) > skb_tail_pointer(skb2)) { | |
1913 | net_crit_ratelimited("protocol %04x is buggy, dev %s\n", | |
1914 | ntohs(skb2->protocol), | |
1915 | dev->name); | |
1916 | skb_reset_network_header(skb2); | |
1da177e4 | 1917 | } |
7866a621 SN |
1918 | |
1919 | skb2->transport_header = skb2->network_header; | |
1920 | skb2->pkt_type = PACKET_OUTGOING; | |
1921 | pt_prev = ptype; | |
1922 | } | |
1923 | ||
1924 | if (ptype_list == &ptype_all) { | |
1925 | ptype_list = &dev->ptype_all; | |
1926 | goto again; | |
1da177e4 | 1927 | } |
7866a621 | 1928 | out_unlock: |
71d9dec2 CG |
1929 | if (pt_prev) |
1930 | pt_prev->func(skb2, skb->dev, pt_prev, skb->dev); | |
1da177e4 LT |
1931 | rcu_read_unlock(); |
1932 | } | |
74b20582 | 1933 | EXPORT_SYMBOL_GPL(dev_queue_xmit_nit); |
1da177e4 | 1934 | |
2c53040f BH |
1935 | /** |
1936 | * netif_setup_tc - Handle tc mappings on real_num_tx_queues change | |
4f57c087 JF |
1937 | * @dev: Network device |
1938 | * @txq: number of queues available | |
1939 | * | |
1940 | * If real_num_tx_queues is changed the tc mappings may no longer be | |
1941 | * valid. To resolve this verify the tc mapping remains valid and if | |
1942 | * not NULL the mapping. With no priorities mapping to this | |
1943 | * offset/count pair it will no longer be used. In the worst case TC0 | |
1944 | * is invalid nothing can be done so disable priority mappings. If is | |
1945 | * expected that drivers will fix this mapping if they can before | |
1946 | * calling netif_set_real_num_tx_queues. | |
1947 | */ | |
bb134d22 | 1948 | static void netif_setup_tc(struct net_device *dev, unsigned int txq) |
4f57c087 JF |
1949 | { |
1950 | int i; | |
1951 | struct netdev_tc_txq *tc = &dev->tc_to_txq[0]; | |
1952 | ||
1953 | /* If TC0 is invalidated disable TC mapping */ | |
1954 | if (tc->offset + tc->count > txq) { | |
7b6cd1ce | 1955 | pr_warn("Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n"); |
4f57c087 JF |
1956 | dev->num_tc = 0; |
1957 | return; | |
1958 | } | |
1959 | ||
1960 | /* Invalidated prio to tc mappings set to TC0 */ | |
1961 | for (i = 1; i < TC_BITMASK + 1; i++) { | |
1962 | int q = netdev_get_prio_tc_map(dev, i); | |
1963 | ||
1964 | tc = &dev->tc_to_txq[q]; | |
1965 | if (tc->offset + tc->count > txq) { | |
7b6cd1ce JP |
1966 | pr_warn("Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n", |
1967 | i, q); | |
4f57c087 JF |
1968 | netdev_set_prio_tc_map(dev, i, 0); |
1969 | } | |
1970 | } | |
1971 | } | |
1972 | ||
8d059b0f AD |
1973 | int netdev_txq_to_tc(struct net_device *dev, unsigned int txq) |
1974 | { | |
1975 | if (dev->num_tc) { | |
1976 | struct netdev_tc_txq *tc = &dev->tc_to_txq[0]; | |
1977 | int i; | |
1978 | ||
1979 | for (i = 0; i < TC_MAX_QUEUE; i++, tc++) { | |
1980 | if ((txq - tc->offset) < tc->count) | |
1981 | return i; | |
1982 | } | |
1983 | ||
1984 | return -1; | |
1985 | } | |
1986 | ||
1987 | return 0; | |
1988 | } | |
1989 | ||
537c00de AD |
1990 | #ifdef CONFIG_XPS |
1991 | static DEFINE_MUTEX(xps_map_mutex); | |
1992 | #define xmap_dereference(P) \ | |
1993 | rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex)) | |
1994 | ||
6234f874 AD |
1995 | static bool remove_xps_queue(struct xps_dev_maps *dev_maps, |
1996 | int tci, u16 index) | |
537c00de | 1997 | { |
10cdc3f3 AD |
1998 | struct xps_map *map = NULL; |
1999 | int pos; | |
537c00de | 2000 | |
10cdc3f3 | 2001 | if (dev_maps) |
6234f874 AD |
2002 | map = xmap_dereference(dev_maps->cpu_map[tci]); |
2003 | if (!map) | |
2004 | return false; | |
537c00de | 2005 | |
6234f874 AD |
2006 | for (pos = map->len; pos--;) { |
2007 | if (map->queues[pos] != index) | |
2008 | continue; | |
2009 | ||
2010 | if (map->len > 1) { | |
2011 | map->queues[pos] = map->queues[--map->len]; | |
10cdc3f3 | 2012 | break; |
537c00de | 2013 | } |
6234f874 AD |
2014 | |
2015 | RCU_INIT_POINTER(dev_maps->cpu_map[tci], NULL); | |
2016 | kfree_rcu(map, rcu); | |
2017 | return false; | |
537c00de AD |
2018 | } |
2019 | ||
6234f874 | 2020 | return true; |
10cdc3f3 AD |
2021 | } |
2022 | ||
6234f874 AD |
2023 | static bool remove_xps_queue_cpu(struct net_device *dev, |
2024 | struct xps_dev_maps *dev_maps, | |
2025 | int cpu, u16 offset, u16 count) | |
2026 | { | |
184c449f AD |
2027 | int num_tc = dev->num_tc ? : 1; |
2028 | bool active = false; | |
2029 | int tci; | |
6234f874 | 2030 | |
184c449f AD |
2031 | for (tci = cpu * num_tc; num_tc--; tci++) { |
2032 | int i, j; | |
2033 | ||
2034 | for (i = count, j = offset; i--; j++) { | |
2035 | if (!remove_xps_queue(dev_maps, cpu, j)) | |
2036 | break; | |
2037 | } | |
2038 | ||
2039 | active |= i < 0; | |
6234f874 AD |
2040 | } |
2041 | ||
184c449f | 2042 | return active; |
6234f874 AD |
2043 | } |
2044 | ||
2045 | static void netif_reset_xps_queues(struct net_device *dev, u16 offset, | |
2046 | u16 count) | |
10cdc3f3 AD |
2047 | { |
2048 | struct xps_dev_maps *dev_maps; | |
024e9679 | 2049 | int cpu, i; |
10cdc3f3 AD |
2050 | bool active = false; |
2051 | ||
2052 | mutex_lock(&xps_map_mutex); | |
2053 | dev_maps = xmap_dereference(dev->xps_maps); | |
2054 | ||
2055 | if (!dev_maps) | |
2056 | goto out_no_maps; | |
2057 | ||
6234f874 AD |
2058 | for_each_possible_cpu(cpu) |
2059 | active |= remove_xps_queue_cpu(dev, dev_maps, cpu, | |
2060 | offset, count); | |
10cdc3f3 AD |
2061 | |
2062 | if (!active) { | |
537c00de AD |
2063 | RCU_INIT_POINTER(dev->xps_maps, NULL); |
2064 | kfree_rcu(dev_maps, rcu); | |
2065 | } | |
2066 | ||
6234f874 | 2067 | for (i = offset + (count - 1); count--; i--) |
024e9679 AD |
2068 | netdev_queue_numa_node_write(netdev_get_tx_queue(dev, i), |
2069 | NUMA_NO_NODE); | |
2070 | ||
537c00de AD |
2071 | out_no_maps: |
2072 | mutex_unlock(&xps_map_mutex); | |
2073 | } | |
2074 | ||
6234f874 AD |
2075 | static void netif_reset_xps_queues_gt(struct net_device *dev, u16 index) |
2076 | { | |
2077 | netif_reset_xps_queues(dev, index, dev->num_tx_queues - index); | |
2078 | } | |
2079 | ||
01c5f864 AD |
2080 | static struct xps_map *expand_xps_map(struct xps_map *map, |
2081 | int cpu, u16 index) | |
2082 | { | |
2083 | struct xps_map *new_map; | |
2084 | int alloc_len = XPS_MIN_MAP_ALLOC; | |
2085 | int i, pos; | |
2086 | ||
2087 | for (pos = 0; map && pos < map->len; pos++) { | |
2088 | if (map->queues[pos] != index) | |
2089 | continue; | |
2090 | return map; | |
2091 | } | |
2092 | ||
2093 | /* Need to add queue to this CPU's existing map */ | |
2094 | if (map) { | |
2095 | if (pos < map->alloc_len) | |
2096 | return map; | |
2097 | ||
2098 | alloc_len = map->alloc_len * 2; | |
2099 | } | |
2100 | ||
2101 | /* Need to allocate new map to store queue on this CPU's map */ | |
2102 | new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len), GFP_KERNEL, | |
2103 | cpu_to_node(cpu)); | |
2104 | if (!new_map) | |
2105 | return NULL; | |
2106 | ||
2107 | for (i = 0; i < pos; i++) | |
2108 | new_map->queues[i] = map->queues[i]; | |
2109 | new_map->alloc_len = alloc_len; | |
2110 | new_map->len = pos; | |
2111 | ||
2112 | return new_map; | |
2113 | } | |
2114 | ||
3573540c MT |
2115 | int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask, |
2116 | u16 index) | |
537c00de | 2117 | { |
01c5f864 | 2118 | struct xps_dev_maps *dev_maps, *new_dev_maps = NULL; |
184c449f AD |
2119 | int i, cpu, tci, numa_node_id = -2; |
2120 | int maps_sz, num_tc = 1, tc = 0; | |
537c00de | 2121 | struct xps_map *map, *new_map; |
01c5f864 | 2122 | bool active = false; |
537c00de | 2123 | |
184c449f AD |
2124 | if (dev->num_tc) { |
2125 | num_tc = dev->num_tc; | |
2126 | tc = netdev_txq_to_tc(dev, index); | |
2127 | if (tc < 0) | |
2128 | return -EINVAL; | |
2129 | } | |
2130 | ||
2131 | maps_sz = XPS_DEV_MAPS_SIZE(num_tc); | |
2132 | if (maps_sz < L1_CACHE_BYTES) | |
2133 | maps_sz = L1_CACHE_BYTES; | |
2134 | ||
537c00de AD |
2135 | mutex_lock(&xps_map_mutex); |
2136 | ||
2137 | dev_maps = xmap_dereference(dev->xps_maps); | |
2138 | ||
01c5f864 | 2139 | /* allocate memory for queue storage */ |
184c449f | 2140 | for_each_cpu_and(cpu, cpu_online_mask, mask) { |
01c5f864 AD |
2141 | if (!new_dev_maps) |
2142 | new_dev_maps = kzalloc(maps_sz, GFP_KERNEL); | |
2bb60cb9 AD |
2143 | if (!new_dev_maps) { |
2144 | mutex_unlock(&xps_map_mutex); | |
01c5f864 | 2145 | return -ENOMEM; |
2bb60cb9 | 2146 | } |
01c5f864 | 2147 | |
184c449f AD |
2148 | tci = cpu * num_tc + tc; |
2149 | map = dev_maps ? xmap_dereference(dev_maps->cpu_map[tci]) : | |
01c5f864 AD |
2150 | NULL; |
2151 | ||
2152 | map = expand_xps_map(map, cpu, index); | |
2153 | if (!map) | |
2154 | goto error; | |
2155 | ||
184c449f | 2156 | RCU_INIT_POINTER(new_dev_maps->cpu_map[tci], map); |
01c5f864 AD |
2157 | } |
2158 | ||
2159 | if (!new_dev_maps) | |
2160 | goto out_no_new_maps; | |
2161 | ||
537c00de | 2162 | for_each_possible_cpu(cpu) { |
184c449f AD |
2163 | /* copy maps belonging to foreign traffic classes */ |
2164 | for (i = tc, tci = cpu * num_tc; dev_maps && i--; tci++) { | |
2165 | /* fill in the new device map from the old device map */ | |
2166 | map = xmap_dereference(dev_maps->cpu_map[tci]); | |
2167 | RCU_INIT_POINTER(new_dev_maps->cpu_map[tci], map); | |
2168 | } | |
2169 | ||
2170 | /* We need to explicitly update tci as prevous loop | |
2171 | * could break out early if dev_maps is NULL. | |
2172 | */ | |
2173 | tci = cpu * num_tc + tc; | |
2174 | ||
01c5f864 AD |
2175 | if (cpumask_test_cpu(cpu, mask) && cpu_online(cpu)) { |
2176 | /* add queue to CPU maps */ | |
2177 | int pos = 0; | |
2178 | ||
184c449f | 2179 | map = xmap_dereference(new_dev_maps->cpu_map[tci]); |
01c5f864 AD |
2180 | while ((pos < map->len) && (map->queues[pos] != index)) |
2181 | pos++; | |
2182 | ||
2183 | if (pos == map->len) | |
2184 | map->queues[map->len++] = index; | |
537c00de | 2185 | #ifdef CONFIG_NUMA |
537c00de AD |
2186 | if (numa_node_id == -2) |
2187 | numa_node_id = cpu_to_node(cpu); | |
2188 | else if (numa_node_id != cpu_to_node(cpu)) | |
2189 | numa_node_id = -1; | |
537c00de | 2190 | #endif |
01c5f864 AD |
2191 | } else if (dev_maps) { |
2192 | /* fill in the new device map from the old device map */ | |
184c449f AD |
2193 | map = xmap_dereference(dev_maps->cpu_map[tci]); |
2194 | RCU_INIT_POINTER(new_dev_maps->cpu_map[tci], map); | |
537c00de | 2195 | } |
01c5f864 | 2196 | |
184c449f AD |
2197 | /* copy maps belonging to foreign traffic classes */ |
2198 | for (i = num_tc - tc, tci++; dev_maps && --i; tci++) { | |
2199 | /* fill in the new device map from the old device map */ | |
2200 | map = xmap_dereference(dev_maps->cpu_map[tci]); | |
2201 | RCU_INIT_POINTER(new_dev_maps->cpu_map[tci], map); | |
2202 | } | |
537c00de AD |
2203 | } |
2204 | ||
01c5f864 AD |
2205 | rcu_assign_pointer(dev->xps_maps, new_dev_maps); |
2206 | ||
537c00de | 2207 | /* Cleanup old maps */ |
184c449f AD |
2208 | if (!dev_maps) |
2209 | goto out_no_old_maps; | |
2210 | ||
2211 | for_each_possible_cpu(cpu) { | |
2212 | for (i = num_tc, tci = cpu * num_tc; i--; tci++) { | |
2213 | new_map = xmap_dereference(new_dev_maps->cpu_map[tci]); | |
2214 | map = xmap_dereference(dev_maps->cpu_map[tci]); | |
01c5f864 AD |
2215 | if (map && map != new_map) |
2216 | kfree_rcu(map, rcu); | |
2217 | } | |
537c00de AD |
2218 | } |
2219 | ||
184c449f AD |
2220 | kfree_rcu(dev_maps, rcu); |
2221 | ||
2222 | out_no_old_maps: | |
01c5f864 AD |
2223 | dev_maps = new_dev_maps; |
2224 | active = true; | |
537c00de | 2225 | |
01c5f864 AD |
2226 | out_no_new_maps: |
2227 | /* update Tx queue numa node */ | |
537c00de AD |
2228 | netdev_queue_numa_node_write(netdev_get_tx_queue(dev, index), |
2229 | (numa_node_id >= 0) ? numa_node_id : | |
2230 | NUMA_NO_NODE); | |
2231 | ||
01c5f864 AD |
2232 | if (!dev_maps) |
2233 | goto out_no_maps; | |
2234 | ||
2235 | /* removes queue from unused CPUs */ | |
2236 | for_each_possible_cpu(cpu) { | |
184c449f AD |
2237 | for (i = tc, tci = cpu * num_tc; i--; tci++) |
2238 | active |= remove_xps_queue(dev_maps, tci, index); | |
2239 | if (!cpumask_test_cpu(cpu, mask) || !cpu_online(cpu)) | |
2240 | active |= remove_xps_queue(dev_maps, tci, index); | |
2241 | for (i = num_tc - tc, tci++; --i; tci++) | |
2242 | active |= remove_xps_queue(dev_maps, tci, index); | |
01c5f864 AD |
2243 | } |
2244 | ||
2245 | /* free map if not active */ | |
2246 | if (!active) { | |
2247 | RCU_INIT_POINTER(dev->xps_maps, NULL); | |
2248 | kfree_rcu(dev_maps, rcu); | |
2249 | } | |
2250 | ||
2251 | out_no_maps: | |
537c00de AD |
2252 | mutex_unlock(&xps_map_mutex); |
2253 | ||
2254 | return 0; | |
2255 | error: | |
01c5f864 AD |
2256 | /* remove any maps that we added */ |
2257 | for_each_possible_cpu(cpu) { | |
184c449f AD |
2258 | for (i = num_tc, tci = cpu * num_tc; i--; tci++) { |
2259 | new_map = xmap_dereference(new_dev_maps->cpu_map[tci]); | |
2260 | map = dev_maps ? | |
2261 | xmap_dereference(dev_maps->cpu_map[tci]) : | |
2262 | NULL; | |
2263 | if (new_map && new_map != map) | |
2264 | kfree(new_map); | |
2265 | } | |
01c5f864 AD |
2266 | } |
2267 | ||
537c00de AD |
2268 | mutex_unlock(&xps_map_mutex); |
2269 | ||
537c00de AD |
2270 | kfree(new_dev_maps); |
2271 | return -ENOMEM; | |
2272 | } | |
2273 | EXPORT_SYMBOL(netif_set_xps_queue); | |
2274 | ||
2275 | #endif | |
9cf1f6a8 AD |
2276 | void netdev_reset_tc(struct net_device *dev) |
2277 | { | |
6234f874 AD |
2278 | #ifdef CONFIG_XPS |
2279 | netif_reset_xps_queues_gt(dev, 0); | |
2280 | #endif | |
9cf1f6a8 AD |
2281 | dev->num_tc = 0; |
2282 | memset(dev->tc_to_txq, 0, sizeof(dev->tc_to_txq)); | |
2283 | memset(dev->prio_tc_map, 0, sizeof(dev->prio_tc_map)); | |
2284 | } | |
2285 | EXPORT_SYMBOL(netdev_reset_tc); | |
2286 | ||
2287 | int netdev_set_tc_queue(struct net_device *dev, u8 tc, u16 count, u16 offset) | |
2288 | { | |
2289 | if (tc >= dev->num_tc) | |
2290 | return -EINVAL; | |
2291 | ||
6234f874 AD |
2292 | #ifdef CONFIG_XPS |
2293 | netif_reset_xps_queues(dev, offset, count); | |
2294 | #endif | |
9cf1f6a8 AD |
2295 | dev->tc_to_txq[tc].count = count; |
2296 | dev->tc_to_txq[tc].offset = offset; | |
2297 | return 0; | |
2298 | } | |
2299 | EXPORT_SYMBOL(netdev_set_tc_queue); | |
2300 | ||
2301 | int netdev_set_num_tc(struct net_device *dev, u8 num_tc) | |
2302 | { | |
2303 | if (num_tc > TC_MAX_QUEUE) | |
2304 | return -EINVAL; | |
2305 | ||
6234f874 AD |
2306 | #ifdef CONFIG_XPS |
2307 | netif_reset_xps_queues_gt(dev, 0); | |
2308 | #endif | |
9cf1f6a8 AD |
2309 | dev->num_tc = num_tc; |
2310 | return 0; | |
2311 | } | |
2312 | EXPORT_SYMBOL(netdev_set_num_tc); | |
2313 | ||
f0796d5c JF |
2314 | /* |
2315 | * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues | |
2316 | * greater then real_num_tx_queues stale skbs on the qdisc must be flushed. | |
2317 | */ | |
e6484930 | 2318 | int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq) |
f0796d5c | 2319 | { |
1d24eb48 TH |
2320 | int rc; |
2321 | ||
e6484930 TH |
2322 | if (txq < 1 || txq > dev->num_tx_queues) |
2323 | return -EINVAL; | |
f0796d5c | 2324 | |
5c56580b BH |
2325 | if (dev->reg_state == NETREG_REGISTERED || |
2326 | dev->reg_state == NETREG_UNREGISTERING) { | |
e6484930 TH |
2327 | ASSERT_RTNL(); |
2328 | ||
1d24eb48 TH |
2329 | rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues, |
2330 | txq); | |
bf264145 TH |
2331 | if (rc) |
2332 | return rc; | |
2333 | ||
4f57c087 JF |
2334 | if (dev->num_tc) |
2335 | netif_setup_tc(dev, txq); | |
2336 | ||
024e9679 | 2337 | if (txq < dev->real_num_tx_queues) { |
e6484930 | 2338 | qdisc_reset_all_tx_gt(dev, txq); |
024e9679 AD |
2339 | #ifdef CONFIG_XPS |
2340 | netif_reset_xps_queues_gt(dev, txq); | |
2341 | #endif | |
2342 | } | |
f0796d5c | 2343 | } |
e6484930 TH |
2344 | |
2345 | dev->real_num_tx_queues = txq; | |
2346 | return 0; | |
f0796d5c JF |
2347 | } |
2348 | EXPORT_SYMBOL(netif_set_real_num_tx_queues); | |
56079431 | 2349 | |
a953be53 | 2350 | #ifdef CONFIG_SYSFS |
62fe0b40 BH |
2351 | /** |
2352 | * netif_set_real_num_rx_queues - set actual number of RX queues used | |
2353 | * @dev: Network device | |
2354 | * @rxq: Actual number of RX queues | |
2355 | * | |
2356 | * This must be called either with the rtnl_lock held or before | |
2357 | * registration of the net device. Returns 0 on success, or a | |
4e7f7951 BH |
2358 | * negative error code. If called before registration, it always |
2359 | * succeeds. | |
62fe0b40 BH |
2360 | */ |
2361 | int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq) | |
2362 | { | |
2363 | int rc; | |
2364 | ||
bd25fa7b TH |
2365 | if (rxq < 1 || rxq > dev->num_rx_queues) |
2366 | return -EINVAL; | |
2367 | ||
62fe0b40 BH |
2368 | if (dev->reg_state == NETREG_REGISTERED) { |
2369 | ASSERT_RTNL(); | |
2370 | ||
62fe0b40 BH |
2371 | rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues, |
2372 | rxq); | |
2373 | if (rc) | |
2374 | return rc; | |
62fe0b40 BH |
2375 | } |
2376 | ||
2377 | dev->real_num_rx_queues = rxq; | |
2378 | return 0; | |
2379 | } | |
2380 | EXPORT_SYMBOL(netif_set_real_num_rx_queues); | |
2381 | #endif | |
2382 | ||
2c53040f BH |
2383 | /** |
2384 | * netif_get_num_default_rss_queues - default number of RSS queues | |
16917b87 YM |
2385 | * |
2386 | * This routine should set an upper limit on the number of RSS queues | |
2387 | * used by default by multiqueue devices. | |
2388 | */ | |
a55b138b | 2389 | int netif_get_num_default_rss_queues(void) |
16917b87 | 2390 | { |
40e4e713 HS |
2391 | return is_kdump_kernel() ? |
2392 | 1 : min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES, num_online_cpus()); | |
16917b87 YM |
2393 | } |
2394 | EXPORT_SYMBOL(netif_get_num_default_rss_queues); | |
2395 | ||
3bcb846c | 2396 | static void __netif_reschedule(struct Qdisc *q) |
56079431 | 2397 | { |
def82a1d JP |
2398 | struct softnet_data *sd; |
2399 | unsigned long flags; | |
56079431 | 2400 | |
def82a1d | 2401 | local_irq_save(flags); |
903ceff7 | 2402 | sd = this_cpu_ptr(&softnet_data); |
a9cbd588 CG |
2403 | q->next_sched = NULL; |
2404 | *sd->output_queue_tailp = q; | |
2405 | sd->output_queue_tailp = &q->next_sched; | |
def82a1d JP |
2406 | raise_softirq_irqoff(NET_TX_SOFTIRQ); |
2407 | local_irq_restore(flags); | |
2408 | } | |
2409 | ||
2410 | void __netif_schedule(struct Qdisc *q) | |
2411 | { | |
2412 | if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state)) | |
2413 | __netif_reschedule(q); | |
56079431 DV |
2414 | } |
2415 | EXPORT_SYMBOL(__netif_schedule); | |
2416 | ||
e6247027 ED |
2417 | struct dev_kfree_skb_cb { |
2418 | enum skb_free_reason reason; | |
2419 | }; | |
2420 | ||
2421 | static struct dev_kfree_skb_cb *get_kfree_skb_cb(const struct sk_buff *skb) | |
56079431 | 2422 | { |
e6247027 ED |
2423 | return (struct dev_kfree_skb_cb *)skb->cb; |
2424 | } | |
2425 | ||
46e5da40 JF |
2426 | void netif_schedule_queue(struct netdev_queue *txq) |
2427 | { | |
2428 | rcu_read_lock(); | |
2429 | if (!(txq->state & QUEUE_STATE_ANY_XOFF)) { | |
2430 | struct Qdisc *q = rcu_dereference(txq->qdisc); | |
2431 | ||
2432 | __netif_schedule(q); | |
2433 | } | |
2434 | rcu_read_unlock(); | |
2435 | } | |
2436 | EXPORT_SYMBOL(netif_schedule_queue); | |
2437 | ||
46e5da40 JF |
2438 | void netif_tx_wake_queue(struct netdev_queue *dev_queue) |
2439 | { | |
2440 | if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state)) { | |
2441 | struct Qdisc *q; | |
2442 | ||
2443 | rcu_read_lock(); | |
2444 | q = rcu_dereference(dev_queue->qdisc); | |
2445 | __netif_schedule(q); | |
2446 | rcu_read_unlock(); | |
2447 | } | |
2448 | } | |
2449 | EXPORT_SYMBOL(netif_tx_wake_queue); | |
2450 | ||
e6247027 | 2451 | void __dev_kfree_skb_irq(struct sk_buff *skb, enum skb_free_reason reason) |
56079431 | 2452 | { |
e6247027 | 2453 | unsigned long flags; |
56079431 | 2454 | |
9899886d MJ |
2455 | if (unlikely(!skb)) |
2456 | return; | |
2457 | ||
e6247027 ED |
2458 | if (likely(atomic_read(&skb->users) == 1)) { |
2459 | smp_rmb(); | |
2460 | atomic_set(&skb->users, 0); | |
2461 | } else if (likely(!atomic_dec_and_test(&skb->users))) { | |
2462 | return; | |
bea3348e | 2463 | } |
e6247027 ED |
2464 | get_kfree_skb_cb(skb)->reason = reason; |
2465 | local_irq_save(flags); | |
2466 | skb->next = __this_cpu_read(softnet_data.completion_queue); | |
2467 | __this_cpu_write(softnet_data.completion_queue, skb); | |
2468 | raise_softirq_irqoff(NET_TX_SOFTIRQ); | |
2469 | local_irq_restore(flags); | |
56079431 | 2470 | } |
e6247027 | 2471 | EXPORT_SYMBOL(__dev_kfree_skb_irq); |
56079431 | 2472 | |
e6247027 | 2473 | void __dev_kfree_skb_any(struct sk_buff *skb, enum skb_free_reason reason) |
56079431 DV |
2474 | { |
2475 | if (in_irq() || irqs_disabled()) | |
e6247027 | 2476 | __dev_kfree_skb_irq(skb, reason); |
56079431 DV |
2477 | else |
2478 | dev_kfree_skb(skb); | |
2479 | } | |
e6247027 | 2480 | EXPORT_SYMBOL(__dev_kfree_skb_any); |
56079431 DV |
2481 | |
2482 | ||
bea3348e SH |
2483 | /** |
2484 | * netif_device_detach - mark device as removed | |
2485 | * @dev: network device | |
2486 | * | |
2487 | * Mark device as removed from system and therefore no longer available. | |
2488 | */ | |
56079431 DV |
2489 | void netif_device_detach(struct net_device *dev) |
2490 | { | |
2491 | if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) && | |
2492 | netif_running(dev)) { | |
d543103a | 2493 | netif_tx_stop_all_queues(dev); |
56079431 DV |
2494 | } |
2495 | } | |
2496 | EXPORT_SYMBOL(netif_device_detach); | |
2497 | ||
bea3348e SH |
2498 | /** |
2499 | * netif_device_attach - mark device as attached | |
2500 | * @dev: network device | |
2501 | * | |
2502 | * Mark device as attached from system and restart if needed. | |
2503 | */ | |
56079431 DV |
2504 | void netif_device_attach(struct net_device *dev) |
2505 | { | |
2506 | if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) && | |
2507 | netif_running(dev)) { | |
d543103a | 2508 | netif_tx_wake_all_queues(dev); |
4ec93edb | 2509 | __netdev_watchdog_up(dev); |
56079431 DV |
2510 | } |
2511 | } | |
2512 | EXPORT_SYMBOL(netif_device_attach); | |
2513 | ||
5605c762 JP |
2514 | /* |
2515 | * Returns a Tx hash based on the given packet descriptor a Tx queues' number | |
2516 | * to be used as a distribution range. | |
2517 | */ | |
2518 | u16 __skb_tx_hash(const struct net_device *dev, struct sk_buff *skb, | |
2519 | unsigned int num_tx_queues) | |
2520 | { | |
2521 | u32 hash; | |
2522 | u16 qoffset = 0; | |
2523 | u16 qcount = num_tx_queues; | |
2524 | ||
2525 | if (skb_rx_queue_recorded(skb)) { | |
2526 | hash = skb_get_rx_queue(skb); | |
2527 | while (unlikely(hash >= num_tx_queues)) | |
2528 | hash -= num_tx_queues; | |
2529 | return hash; | |
2530 | } | |
2531 | ||
2532 | if (dev->num_tc) { | |
2533 | u8 tc = netdev_get_prio_tc_map(dev, skb->priority); | |
f4563a75 | 2534 | |
5605c762 JP |
2535 | qoffset = dev->tc_to_txq[tc].offset; |
2536 | qcount = dev->tc_to_txq[tc].count; | |
2537 | } | |
2538 | ||
2539 | return (u16) reciprocal_scale(skb_get_hash(skb), qcount) + qoffset; | |
2540 | } | |
2541 | EXPORT_SYMBOL(__skb_tx_hash); | |
2542 | ||
36c92474 BH |
2543 | static void skb_warn_bad_offload(const struct sk_buff *skb) |
2544 | { | |
84d15ae5 | 2545 | static const netdev_features_t null_features; |
36c92474 | 2546 | struct net_device *dev = skb->dev; |
88ad4175 | 2547 | const char *name = ""; |
36c92474 | 2548 | |
c846ad9b BG |
2549 | if (!net_ratelimit()) |
2550 | return; | |
2551 | ||
88ad4175 BM |
2552 | if (dev) { |
2553 | if (dev->dev.parent) | |
2554 | name = dev_driver_string(dev->dev.parent); | |
2555 | else | |
2556 | name = netdev_name(dev); | |
2557 | } | |
36c92474 BH |
2558 | WARN(1, "%s: caps=(%pNF, %pNF) len=%d data_len=%d gso_size=%d " |
2559 | "gso_type=%d ip_summed=%d\n", | |
88ad4175 | 2560 | name, dev ? &dev->features : &null_features, |
65e9d2fa | 2561 | skb->sk ? &skb->sk->sk_route_caps : &null_features, |
36c92474 BH |
2562 | skb->len, skb->data_len, skb_shinfo(skb)->gso_size, |
2563 | skb_shinfo(skb)->gso_type, skb->ip_summed); | |
2564 | } | |
2565 | ||
1da177e4 LT |
2566 | /* |
2567 | * Invalidate hardware checksum when packet is to be mangled, and | |
2568 | * complete checksum manually on outgoing path. | |
2569 | */ | |
84fa7933 | 2570 | int skb_checksum_help(struct sk_buff *skb) |
1da177e4 | 2571 | { |
d3bc23e7 | 2572 | __wsum csum; |
663ead3b | 2573 | int ret = 0, offset; |
1da177e4 | 2574 | |
84fa7933 | 2575 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
a430a43d HX |
2576 | goto out_set_summed; |
2577 | ||
2578 | if (unlikely(skb_shinfo(skb)->gso_size)) { | |
36c92474 BH |
2579 | skb_warn_bad_offload(skb); |
2580 | return -EINVAL; | |
1da177e4 LT |
2581 | } |
2582 | ||
cef401de ED |
2583 | /* Before computing a checksum, we should make sure no frag could |
2584 | * be modified by an external entity : checksum could be wrong. | |
2585 | */ | |
2586 | if (skb_has_shared_frag(skb)) { | |
2587 | ret = __skb_linearize(skb); | |
2588 | if (ret) | |
2589 | goto out; | |
2590 | } | |
2591 | ||
55508d60 | 2592 | offset = skb_checksum_start_offset(skb); |
a030847e HX |
2593 | BUG_ON(offset >= skb_headlen(skb)); |
2594 | csum = skb_checksum(skb, offset, skb->len - offset, 0); | |
2595 | ||
2596 | offset += skb->csum_offset; | |
2597 | BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb)); | |
2598 | ||
2599 | if (skb_cloned(skb) && | |
2600 | !skb_clone_writable(skb, offset + sizeof(__sum16))) { | |
1da177e4 LT |
2601 | ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC); |
2602 | if (ret) | |
2603 | goto out; | |
2604 | } | |
2605 | ||
4f2e4ad5 | 2606 | *(__sum16 *)(skb->data + offset) = csum_fold(csum) ?: CSUM_MANGLED_0; |
a430a43d | 2607 | out_set_summed: |
1da177e4 | 2608 | skb->ip_summed = CHECKSUM_NONE; |
4ec93edb | 2609 | out: |
1da177e4 LT |
2610 | return ret; |
2611 | } | |
d1b19dff | 2612 | EXPORT_SYMBOL(skb_checksum_help); |
1da177e4 | 2613 | |
53d6471c | 2614 | __be16 skb_network_protocol(struct sk_buff *skb, int *depth) |
f6a78bfc | 2615 | { |
252e3346 | 2616 | __be16 type = skb->protocol; |
f6a78bfc | 2617 | |
19acc327 PS |
2618 | /* Tunnel gso handlers can set protocol to ethernet. */ |
2619 | if (type == htons(ETH_P_TEB)) { | |
2620 | struct ethhdr *eth; | |
2621 | ||
2622 | if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr)))) | |
2623 | return 0; | |
2624 | ||
2625 | eth = (struct ethhdr *)skb_mac_header(skb); | |
2626 | type = eth->h_proto; | |
2627 | } | |
2628 | ||
d4bcef3f | 2629 | return __vlan_get_protocol(skb, type, depth); |
ec5f0615 PS |
2630 | } |
2631 | ||
2632 | /** | |
2633 | * skb_mac_gso_segment - mac layer segmentation handler. | |
2634 | * @skb: buffer to segment | |
2635 | * @features: features for the output path (see dev->features) | |
2636 | */ | |
2637 | struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb, | |
2638 | netdev_features_t features) | |
2639 | { | |
2640 | struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT); | |
2641 | struct packet_offload *ptype; | |
53d6471c VY |
2642 | int vlan_depth = skb->mac_len; |
2643 | __be16 type = skb_network_protocol(skb, &vlan_depth); | |
ec5f0615 PS |
2644 | |
2645 | if (unlikely(!type)) | |
2646 | return ERR_PTR(-EINVAL); | |
2647 | ||
53d6471c | 2648 | __skb_pull(skb, vlan_depth); |
f6a78bfc HX |
2649 | |
2650 | rcu_read_lock(); | |
22061d80 | 2651 | list_for_each_entry_rcu(ptype, &offload_base, list) { |
f191a1d1 | 2652 | if (ptype->type == type && ptype->callbacks.gso_segment) { |
f191a1d1 | 2653 | segs = ptype->callbacks.gso_segment(skb, features); |
f6a78bfc HX |
2654 | break; |
2655 | } | |
2656 | } | |
2657 | rcu_read_unlock(); | |
2658 | ||
98e399f8 | 2659 | __skb_push(skb, skb->data - skb_mac_header(skb)); |
576a30eb | 2660 | |
f6a78bfc HX |
2661 | return segs; |
2662 | } | |
05e8ef4a PS |
2663 | EXPORT_SYMBOL(skb_mac_gso_segment); |
2664 | ||
2665 | ||
2666 | /* openvswitch calls this on rx path, so we need a different check. | |
2667 | */ | |
2668 | static inline bool skb_needs_check(struct sk_buff *skb, bool tx_path) | |
2669 | { | |
2670 | if (tx_path) | |
6e7bc478 ED |
2671 | return skb->ip_summed != CHECKSUM_PARTIAL && |
2672 | skb->ip_summed != CHECKSUM_NONE; | |
2673 | ||
2674 | return skb->ip_summed == CHECKSUM_NONE; | |
05e8ef4a PS |
2675 | } |
2676 | ||
2677 | /** | |
2678 | * __skb_gso_segment - Perform segmentation on skb. | |
2679 | * @skb: buffer to segment | |
2680 | * @features: features for the output path (see dev->features) | |
2681 | * @tx_path: whether it is called in TX path | |
2682 | * | |
2683 | * This function segments the given skb and returns a list of segments. | |
2684 | * | |
2685 | * It may return NULL if the skb requires no segmentation. This is | |
2686 | * only possible when GSO is used for verifying header integrity. | |
9207f9d4 KK |
2687 | * |
2688 | * Segmentation preserves SKB_SGO_CB_OFFSET bytes of previous skb cb. | |
05e8ef4a PS |
2689 | */ |
2690 | struct sk_buff *__skb_gso_segment(struct sk_buff *skb, | |
2691 | netdev_features_t features, bool tx_path) | |
2692 | { | |
b2504a5d ED |
2693 | struct sk_buff *segs; |
2694 | ||
05e8ef4a PS |
2695 | if (unlikely(skb_needs_check(skb, tx_path))) { |
2696 | int err; | |
2697 | ||
b2504a5d | 2698 | /* We're going to init ->check field in TCP or UDP header */ |
a40e0a66 | 2699 | err = skb_cow_head(skb, 0); |
2700 | if (err < 0) | |
05e8ef4a PS |
2701 | return ERR_PTR(err); |
2702 | } | |
2703 | ||
802ab55a AD |
2704 | /* Only report GSO partial support if it will enable us to |
2705 | * support segmentation on this frame without needing additional | |
2706 | * work. | |
2707 | */ | |
2708 | if (features & NETIF_F_GSO_PARTIAL) { | |
2709 | netdev_features_t partial_features = NETIF_F_GSO_ROBUST; | |
2710 | struct net_device *dev = skb->dev; | |
2711 | ||
2712 | partial_features |= dev->features & dev->gso_partial_features; | |
2713 | if (!skb_gso_ok(skb, features | partial_features)) | |
2714 | features &= ~NETIF_F_GSO_PARTIAL; | |
2715 | } | |
2716 | ||
9207f9d4 KK |
2717 | BUILD_BUG_ON(SKB_SGO_CB_OFFSET + |
2718 | sizeof(*SKB_GSO_CB(skb)) > sizeof(skb->cb)); | |
2719 | ||
68c33163 | 2720 | SKB_GSO_CB(skb)->mac_offset = skb_headroom(skb); |
3347c960 ED |
2721 | SKB_GSO_CB(skb)->encap_level = 0; |
2722 | ||
05e8ef4a PS |
2723 | skb_reset_mac_header(skb); |
2724 | skb_reset_mac_len(skb); | |
2725 | ||
b2504a5d ED |
2726 | segs = skb_mac_gso_segment(skb, features); |
2727 | ||
2728 | if (unlikely(skb_needs_check(skb, tx_path))) | |
2729 | skb_warn_bad_offload(skb); | |
2730 | ||
2731 | return segs; | |
05e8ef4a | 2732 | } |
12b0004d | 2733 | EXPORT_SYMBOL(__skb_gso_segment); |
f6a78bfc | 2734 | |
fb286bb2 HX |
2735 | /* Take action when hardware reception checksum errors are detected. */ |
2736 | #ifdef CONFIG_BUG | |
2737 | void netdev_rx_csum_fault(struct net_device *dev) | |
2738 | { | |
2739 | if (net_ratelimit()) { | |
7b6cd1ce | 2740 | pr_err("%s: hw csum failure\n", dev ? dev->name : "<unknown>"); |
fb286bb2 HX |
2741 | dump_stack(); |
2742 | } | |
2743 | } | |
2744 | EXPORT_SYMBOL(netdev_rx_csum_fault); | |
2745 | #endif | |
2746 | ||
1da177e4 LT |
2747 | /* Actually, we should eliminate this check as soon as we know, that: |
2748 | * 1. IOMMU is present and allows to map all the memory. | |
2749 | * 2. No high memory really exists on this machine. | |
2750 | */ | |
2751 | ||
c1e756bf | 2752 | static int illegal_highdma(struct net_device *dev, struct sk_buff *skb) |
1da177e4 | 2753 | { |
3d3a8533 | 2754 | #ifdef CONFIG_HIGHMEM |
1da177e4 | 2755 | int i; |
f4563a75 | 2756 | |
5acbbd42 | 2757 | if (!(dev->features & NETIF_F_HIGHDMA)) { |
ea2ab693 IC |
2758 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { |
2759 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; | |
f4563a75 | 2760 | |
ea2ab693 | 2761 | if (PageHighMem(skb_frag_page(frag))) |
5acbbd42 | 2762 | return 1; |
ea2ab693 | 2763 | } |
5acbbd42 | 2764 | } |
1da177e4 | 2765 | |
5acbbd42 FT |
2766 | if (PCI_DMA_BUS_IS_PHYS) { |
2767 | struct device *pdev = dev->dev.parent; | |
1da177e4 | 2768 | |
9092c658 ED |
2769 | if (!pdev) |
2770 | return 0; | |
5acbbd42 | 2771 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { |
ea2ab693 IC |
2772 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; |
2773 | dma_addr_t addr = page_to_phys(skb_frag_page(frag)); | |
f4563a75 | 2774 | |
5acbbd42 FT |
2775 | if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask) |
2776 | return 1; | |
2777 | } | |
2778 | } | |
3d3a8533 | 2779 | #endif |
1da177e4 LT |
2780 | return 0; |
2781 | } | |
1da177e4 | 2782 | |
3b392ddb SH |
2783 | /* If MPLS offload request, verify we are testing hardware MPLS features |
2784 | * instead of standard features for the netdev. | |
2785 | */ | |
d0edc7bf | 2786 | #if IS_ENABLED(CONFIG_NET_MPLS_GSO) |
3b392ddb SH |
2787 | static netdev_features_t net_mpls_features(struct sk_buff *skb, |
2788 | netdev_features_t features, | |
2789 | __be16 type) | |
2790 | { | |
25cd9ba0 | 2791 | if (eth_p_mpls(type)) |
3b392ddb SH |
2792 | features &= skb->dev->mpls_features; |
2793 | ||
2794 | return features; | |
2795 | } | |
2796 | #else | |
2797 | static netdev_features_t net_mpls_features(struct sk_buff *skb, | |
2798 | netdev_features_t features, | |
2799 | __be16 type) | |
2800 | { | |
2801 | return features; | |
2802 | } | |
2803 | #endif | |
2804 | ||
c8f44aff | 2805 | static netdev_features_t harmonize_features(struct sk_buff *skb, |
c1e756bf | 2806 | netdev_features_t features) |
f01a5236 | 2807 | { |
53d6471c | 2808 | int tmp; |
3b392ddb SH |
2809 | __be16 type; |
2810 | ||
2811 | type = skb_network_protocol(skb, &tmp); | |
2812 | features = net_mpls_features(skb, features, type); | |
53d6471c | 2813 | |
c0d680e5 | 2814 | if (skb->ip_summed != CHECKSUM_NONE && |
3b392ddb | 2815 | !can_checksum_protocol(features, type)) { |
996e8021 | 2816 | features &= ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK); |
f01a5236 | 2817 | } |
7be2c82c ED |
2818 | if (illegal_highdma(skb->dev, skb)) |
2819 | features &= ~NETIF_F_SG; | |
f01a5236 JG |
2820 | |
2821 | return features; | |
2822 | } | |
2823 | ||
e38f3025 TM |
2824 | netdev_features_t passthru_features_check(struct sk_buff *skb, |
2825 | struct net_device *dev, | |
2826 | netdev_features_t features) | |
2827 | { | |
2828 | return features; | |
2829 | } | |
2830 | EXPORT_SYMBOL(passthru_features_check); | |
2831 | ||
8cb65d00 TM |
2832 | static netdev_features_t dflt_features_check(const struct sk_buff *skb, |
2833 | struct net_device *dev, | |
2834 | netdev_features_t features) | |
2835 | { | |
2836 | return vlan_features_check(skb, features); | |
2837 | } | |
2838 | ||
cbc53e08 AD |
2839 | static netdev_features_t gso_features_check(const struct sk_buff *skb, |
2840 | struct net_device *dev, | |
2841 | netdev_features_t features) | |
2842 | { | |
2843 | u16 gso_segs = skb_shinfo(skb)->gso_segs; | |
2844 | ||
2845 | if (gso_segs > dev->gso_max_segs) | |
2846 | return features & ~NETIF_F_GSO_MASK; | |
2847 | ||
802ab55a AD |
2848 | /* Support for GSO partial features requires software |
2849 | * intervention before we can actually process the packets | |
2850 | * so we need to strip support for any partial features now | |
2851 | * and we can pull them back in after we have partially | |
2852 | * segmented the frame. | |
2853 | */ | |
2854 | if (!(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL)) | |
2855 | features &= ~dev->gso_partial_features; | |
2856 | ||
2857 | /* Make sure to clear the IPv4 ID mangling feature if the | |
2858 | * IPv4 header has the potential to be fragmented. | |
cbc53e08 AD |
2859 | */ |
2860 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) { | |
2861 | struct iphdr *iph = skb->encapsulation ? | |
2862 | inner_ip_hdr(skb) : ip_hdr(skb); | |
2863 | ||
2864 | if (!(iph->frag_off & htons(IP_DF))) | |
2865 | features &= ~NETIF_F_TSO_MANGLEID; | |
2866 | } | |
2867 | ||
2868 | return features; | |
2869 | } | |
2870 | ||
c1e756bf | 2871 | netdev_features_t netif_skb_features(struct sk_buff *skb) |
58e998c6 | 2872 | { |
5f35227e | 2873 | struct net_device *dev = skb->dev; |
fcbeb976 | 2874 | netdev_features_t features = dev->features; |
58e998c6 | 2875 | |
cbc53e08 AD |
2876 | if (skb_is_gso(skb)) |
2877 | features = gso_features_check(skb, dev, features); | |
30b678d8 | 2878 | |
5f35227e JG |
2879 | /* If encapsulation offload request, verify we are testing |
2880 | * hardware encapsulation features instead of standard | |
2881 | * features for the netdev | |
2882 | */ | |
2883 | if (skb->encapsulation) | |
2884 | features &= dev->hw_enc_features; | |
2885 | ||
f5a7fb88 TM |
2886 | if (skb_vlan_tagged(skb)) |
2887 | features = netdev_intersect_features(features, | |
2888 | dev->vlan_features | | |
2889 | NETIF_F_HW_VLAN_CTAG_TX | | |
2890 | NETIF_F_HW_VLAN_STAG_TX); | |
f01a5236 | 2891 | |
5f35227e JG |
2892 | if (dev->netdev_ops->ndo_features_check) |
2893 | features &= dev->netdev_ops->ndo_features_check(skb, dev, | |
2894 | features); | |
8cb65d00 TM |
2895 | else |
2896 | features &= dflt_features_check(skb, dev, features); | |
5f35227e | 2897 | |
c1e756bf | 2898 | return harmonize_features(skb, features); |
58e998c6 | 2899 | } |
c1e756bf | 2900 | EXPORT_SYMBOL(netif_skb_features); |
58e998c6 | 2901 | |
2ea25513 | 2902 | static int xmit_one(struct sk_buff *skb, struct net_device *dev, |
95f6b3dd | 2903 | struct netdev_queue *txq, bool more) |
f6a78bfc | 2904 | { |
2ea25513 DM |
2905 | unsigned int len; |
2906 | int rc; | |
00829823 | 2907 | |
7866a621 | 2908 | if (!list_empty(&ptype_all) || !list_empty(&dev->ptype_all)) |
2ea25513 | 2909 | dev_queue_xmit_nit(skb, dev); |
fc741216 | 2910 | |
2ea25513 DM |
2911 | len = skb->len; |
2912 | trace_net_dev_start_xmit(skb, dev); | |
95f6b3dd | 2913 | rc = netdev_start_xmit(skb, dev, txq, more); |
2ea25513 | 2914 | trace_net_dev_xmit(skb, rc, dev, len); |
adf30907 | 2915 | |
2ea25513 DM |
2916 | return rc; |
2917 | } | |
7b9c6090 | 2918 | |
8dcda22a DM |
2919 | struct sk_buff *dev_hard_start_xmit(struct sk_buff *first, struct net_device *dev, |
2920 | struct netdev_queue *txq, int *ret) | |
7f2e870f DM |
2921 | { |
2922 | struct sk_buff *skb = first; | |
2923 | int rc = NETDEV_TX_OK; | |
7b9c6090 | 2924 | |
7f2e870f DM |
2925 | while (skb) { |
2926 | struct sk_buff *next = skb->next; | |
fc70fb64 | 2927 | |
7f2e870f | 2928 | skb->next = NULL; |
95f6b3dd | 2929 | rc = xmit_one(skb, dev, txq, next != NULL); |
7f2e870f DM |
2930 | if (unlikely(!dev_xmit_complete(rc))) { |
2931 | skb->next = next; | |
2932 | goto out; | |
2933 | } | |
6afff0ca | 2934 | |
7f2e870f DM |
2935 | skb = next; |
2936 | if (netif_xmit_stopped(txq) && skb) { | |
2937 | rc = NETDEV_TX_BUSY; | |
2938 | break; | |
9ccb8975 | 2939 | } |
7f2e870f | 2940 | } |
9ccb8975 | 2941 | |
7f2e870f DM |
2942 | out: |
2943 | *ret = rc; | |
2944 | return skb; | |
2945 | } | |
b40863c6 | 2946 | |
1ff0dc94 ED |
2947 | static struct sk_buff *validate_xmit_vlan(struct sk_buff *skb, |
2948 | netdev_features_t features) | |
f6a78bfc | 2949 | { |
df8a39de | 2950 | if (skb_vlan_tag_present(skb) && |
5968250c JP |
2951 | !vlan_hw_offload_capable(features, skb->vlan_proto)) |
2952 | skb = __vlan_hwaccel_push_inside(skb); | |
eae3f88e DM |
2953 | return skb; |
2954 | } | |
f6a78bfc | 2955 | |
55a93b3e | 2956 | static struct sk_buff *validate_xmit_skb(struct sk_buff *skb, struct net_device *dev) |
eae3f88e DM |
2957 | { |
2958 | netdev_features_t features; | |
f6a78bfc | 2959 | |
eae3f88e DM |
2960 | features = netif_skb_features(skb); |
2961 | skb = validate_xmit_vlan(skb, features); | |
2962 | if (unlikely(!skb)) | |
2963 | goto out_null; | |
7b9c6090 | 2964 | |
8b86a61d | 2965 | if (netif_needs_gso(skb, features)) { |
ce93718f DM |
2966 | struct sk_buff *segs; |
2967 | ||
2968 | segs = skb_gso_segment(skb, features); | |
cecda693 | 2969 | if (IS_ERR(segs)) { |
af6dabc9 | 2970 | goto out_kfree_skb; |
cecda693 JW |
2971 | } else if (segs) { |
2972 | consume_skb(skb); | |
2973 | skb = segs; | |
f6a78bfc | 2974 | } |
eae3f88e DM |
2975 | } else { |
2976 | if (skb_needs_linearize(skb, features) && | |
2977 | __skb_linearize(skb)) | |
2978 | goto out_kfree_skb; | |
4ec93edb | 2979 | |
f6e27114 SK |
2980 | if (validate_xmit_xfrm(skb, features)) |
2981 | goto out_kfree_skb; | |
2982 | ||
eae3f88e DM |
2983 | /* If packet is not checksummed and device does not |
2984 | * support checksumming for this protocol, complete | |
2985 | * checksumming here. | |
2986 | */ | |
2987 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
2988 | if (skb->encapsulation) | |
2989 | skb_set_inner_transport_header(skb, | |
2990 | skb_checksum_start_offset(skb)); | |
2991 | else | |
2992 | skb_set_transport_header(skb, | |
2993 | skb_checksum_start_offset(skb)); | |
a188222b | 2994 | if (!(features & NETIF_F_CSUM_MASK) && |
eae3f88e DM |
2995 | skb_checksum_help(skb)) |
2996 | goto out_kfree_skb; | |
7b9c6090 | 2997 | } |
0c772159 | 2998 | } |
7b9c6090 | 2999 | |
eae3f88e | 3000 | return skb; |
fc70fb64 | 3001 | |
f6a78bfc HX |
3002 | out_kfree_skb: |
3003 | kfree_skb(skb); | |
eae3f88e | 3004 | out_null: |
d21fd63e | 3005 | atomic_long_inc(&dev->tx_dropped); |
eae3f88e DM |
3006 | return NULL; |
3007 | } | |
6afff0ca | 3008 | |
55a93b3e ED |
3009 | struct sk_buff *validate_xmit_skb_list(struct sk_buff *skb, struct net_device *dev) |
3010 | { | |
3011 | struct sk_buff *next, *head = NULL, *tail; | |
3012 | ||
bec3cfdc | 3013 | for (; skb != NULL; skb = next) { |
55a93b3e ED |
3014 | next = skb->next; |
3015 | skb->next = NULL; | |
bec3cfdc ED |
3016 | |
3017 | /* in case skb wont be segmented, point to itself */ | |
3018 | skb->prev = skb; | |
3019 | ||
55a93b3e | 3020 | skb = validate_xmit_skb(skb, dev); |
bec3cfdc ED |
3021 | if (!skb) |
3022 | continue; | |
55a93b3e | 3023 | |
bec3cfdc ED |
3024 | if (!head) |
3025 | head = skb; | |
3026 | else | |
3027 | tail->next = skb; | |
3028 | /* If skb was segmented, skb->prev points to | |
3029 | * the last segment. If not, it still contains skb. | |
3030 | */ | |
3031 | tail = skb->prev; | |
55a93b3e ED |
3032 | } |
3033 | return head; | |
f6a78bfc | 3034 | } |
104ba78c | 3035 | EXPORT_SYMBOL_GPL(validate_xmit_skb_list); |
f6a78bfc | 3036 | |
1def9238 ED |
3037 | static void qdisc_pkt_len_init(struct sk_buff *skb) |
3038 | { | |
3039 | const struct skb_shared_info *shinfo = skb_shinfo(skb); | |
3040 | ||
3041 | qdisc_skb_cb(skb)->pkt_len = skb->len; | |
3042 | ||
3043 | /* To get more precise estimation of bytes sent on wire, | |
3044 | * we add to pkt_len the headers size of all segments | |
3045 | */ | |
3046 | if (shinfo->gso_size) { | |
757b8b1d | 3047 | unsigned int hdr_len; |
15e5a030 | 3048 | u16 gso_segs = shinfo->gso_segs; |
1def9238 | 3049 | |
757b8b1d ED |
3050 | /* mac layer + network layer */ |
3051 | hdr_len = skb_transport_header(skb) - skb_mac_header(skb); | |
3052 | ||
3053 | /* + transport layer */ | |
1def9238 ED |
3054 | if (likely(shinfo->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6))) |
3055 | hdr_len += tcp_hdrlen(skb); | |
3056 | else | |
3057 | hdr_len += sizeof(struct udphdr); | |
15e5a030 JW |
3058 | |
3059 | if (shinfo->gso_type & SKB_GSO_DODGY) | |
3060 | gso_segs = DIV_ROUND_UP(skb->len - hdr_len, | |
3061 | shinfo->gso_size); | |
3062 | ||
3063 | qdisc_skb_cb(skb)->pkt_len += (gso_segs - 1) * hdr_len; | |
1def9238 ED |
3064 | } |
3065 | } | |
3066 | ||
bbd8a0d3 KK |
3067 | static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q, |
3068 | struct net_device *dev, | |
3069 | struct netdev_queue *txq) | |
3070 | { | |
3071 | spinlock_t *root_lock = qdisc_lock(q); | |
520ac30f | 3072 | struct sk_buff *to_free = NULL; |
a2da570d | 3073 | bool contended; |
bbd8a0d3 KK |
3074 | int rc; |
3075 | ||
a2da570d | 3076 | qdisc_calculate_pkt_len(skb, q); |
79640a4c ED |
3077 | /* |
3078 | * Heuristic to force contended enqueues to serialize on a | |
3079 | * separate lock before trying to get qdisc main lock. | |
f9eb8aea | 3080 | * This permits qdisc->running owner to get the lock more |
9bf2b8c2 | 3081 | * often and dequeue packets faster. |
79640a4c | 3082 | */ |
a2da570d | 3083 | contended = qdisc_is_running(q); |
79640a4c ED |
3084 | if (unlikely(contended)) |
3085 | spin_lock(&q->busylock); | |
3086 | ||
bbd8a0d3 KK |
3087 | spin_lock(root_lock); |
3088 | if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) { | |
520ac30f | 3089 | __qdisc_drop(skb, &to_free); |
bbd8a0d3 KK |
3090 | rc = NET_XMIT_DROP; |
3091 | } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) && | |
bc135b23 | 3092 | qdisc_run_begin(q)) { |
bbd8a0d3 KK |
3093 | /* |
3094 | * This is a work-conserving queue; there are no old skbs | |
3095 | * waiting to be sent out; and the qdisc is not running - | |
3096 | * xmit the skb directly. | |
3097 | */ | |
bfe0d029 | 3098 | |
bfe0d029 ED |
3099 | qdisc_bstats_update(q, skb); |
3100 | ||
55a93b3e | 3101 | if (sch_direct_xmit(skb, q, dev, txq, root_lock, true)) { |
79640a4c ED |
3102 | if (unlikely(contended)) { |
3103 | spin_unlock(&q->busylock); | |
3104 | contended = false; | |
3105 | } | |
bbd8a0d3 | 3106 | __qdisc_run(q); |
79640a4c | 3107 | } else |
bc135b23 | 3108 | qdisc_run_end(q); |
bbd8a0d3 KK |
3109 | |
3110 | rc = NET_XMIT_SUCCESS; | |
3111 | } else { | |
520ac30f | 3112 | rc = q->enqueue(skb, q, &to_free) & NET_XMIT_MASK; |
79640a4c ED |
3113 | if (qdisc_run_begin(q)) { |
3114 | if (unlikely(contended)) { | |
3115 | spin_unlock(&q->busylock); | |
3116 | contended = false; | |
3117 | } | |
3118 | __qdisc_run(q); | |
3119 | } | |
bbd8a0d3 KK |
3120 | } |
3121 | spin_unlock(root_lock); | |
520ac30f ED |
3122 | if (unlikely(to_free)) |
3123 | kfree_skb_list(to_free); | |
79640a4c ED |
3124 | if (unlikely(contended)) |
3125 | spin_unlock(&q->busylock); | |
bbd8a0d3 KK |
3126 | return rc; |
3127 | } | |
3128 | ||
86f8515f | 3129 | #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO) |
5bc1421e NH |
3130 | static void skb_update_prio(struct sk_buff *skb) |
3131 | { | |
6977a79d | 3132 | struct netprio_map *map = rcu_dereference_bh(skb->dev->priomap); |
5bc1421e | 3133 | |
91c68ce2 | 3134 | if (!skb->priority && skb->sk && map) { |
2a56a1fe TH |
3135 | unsigned int prioidx = |
3136 | sock_cgroup_prioidx(&skb->sk->sk_cgrp_data); | |
91c68ce2 ED |
3137 | |
3138 | if (prioidx < map->priomap_len) | |
3139 | skb->priority = map->priomap[prioidx]; | |
3140 | } | |
5bc1421e NH |
3141 | } |
3142 | #else | |
3143 | #define skb_update_prio(skb) | |
3144 | #endif | |
3145 | ||
f60e5990 | 3146 | DEFINE_PER_CPU(int, xmit_recursion); |
3147 | EXPORT_SYMBOL(xmit_recursion); | |
3148 | ||
95603e22 MM |
3149 | /** |
3150 | * dev_loopback_xmit - loop back @skb | |
0c4b51f0 EB |
3151 | * @net: network namespace this loopback is happening in |
3152 | * @sk: sk needed to be a netfilter okfn | |
95603e22 MM |
3153 | * @skb: buffer to transmit |
3154 | */ | |
0c4b51f0 | 3155 | int dev_loopback_xmit(struct net *net, struct sock *sk, struct sk_buff *skb) |
95603e22 MM |
3156 | { |
3157 | skb_reset_mac_header(skb); | |
3158 | __skb_pull(skb, skb_network_offset(skb)); | |
3159 | skb->pkt_type = PACKET_LOOPBACK; | |
3160 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
3161 | WARN_ON(!skb_dst(skb)); | |
3162 | skb_dst_force(skb); | |
3163 | netif_rx_ni(skb); | |
3164 | return 0; | |
3165 | } | |
3166 | EXPORT_SYMBOL(dev_loopback_xmit); | |
3167 | ||
1f211a1b DB |
3168 | #ifdef CONFIG_NET_EGRESS |
3169 | static struct sk_buff * | |
3170 | sch_handle_egress(struct sk_buff *skb, int *ret, struct net_device *dev) | |
3171 | { | |
3172 | struct tcf_proto *cl = rcu_dereference_bh(dev->egress_cl_list); | |
3173 | struct tcf_result cl_res; | |
3174 | ||
3175 | if (!cl) | |
3176 | return skb; | |
3177 | ||
8dc07fdb | 3178 | /* qdisc_skb_cb(skb)->pkt_len was already set by the caller. */ |
1f211a1b DB |
3179 | qdisc_bstats_cpu_update(cl->q, skb); |
3180 | ||
3181 | switch (tc_classify(skb, cl, &cl_res, false)) { | |
3182 | case TC_ACT_OK: | |
3183 | case TC_ACT_RECLASSIFY: | |
3184 | skb->tc_index = TC_H_MIN(cl_res.classid); | |
3185 | break; | |
3186 | case TC_ACT_SHOT: | |
3187 | qdisc_qstats_cpu_drop(cl->q); | |
3188 | *ret = NET_XMIT_DROP; | |
7e2c3aea DB |
3189 | kfree_skb(skb); |
3190 | return NULL; | |
1f211a1b DB |
3191 | case TC_ACT_STOLEN: |
3192 | case TC_ACT_QUEUED: | |
3193 | *ret = NET_XMIT_SUCCESS; | |
7e2c3aea | 3194 | consume_skb(skb); |
1f211a1b DB |
3195 | return NULL; |
3196 | case TC_ACT_REDIRECT: | |
3197 | /* No need to push/pop skb's mac_header here on egress! */ | |
3198 | skb_do_redirect(skb); | |
3199 | *ret = NET_XMIT_SUCCESS; | |
3200 | return NULL; | |
3201 | default: | |
3202 | break; | |
3203 | } | |
3204 | ||
3205 | return skb; | |
3206 | } | |
3207 | #endif /* CONFIG_NET_EGRESS */ | |
3208 | ||
638b2a69 JP |
3209 | static inline int get_xps_queue(struct net_device *dev, struct sk_buff *skb) |
3210 | { | |
3211 | #ifdef CONFIG_XPS | |
3212 | struct xps_dev_maps *dev_maps; | |
3213 | struct xps_map *map; | |
3214 | int queue_index = -1; | |
3215 | ||
3216 | rcu_read_lock(); | |
3217 | dev_maps = rcu_dereference(dev->xps_maps); | |
3218 | if (dev_maps) { | |
184c449f AD |
3219 | unsigned int tci = skb->sender_cpu - 1; |
3220 | ||
3221 | if (dev->num_tc) { | |
3222 | tci *= dev->num_tc; | |
3223 | tci += netdev_get_prio_tc_map(dev, skb->priority); | |
3224 | } | |
3225 | ||
3226 | map = rcu_dereference(dev_maps->cpu_map[tci]); | |
638b2a69 JP |
3227 | if (map) { |
3228 | if (map->len == 1) | |
3229 | queue_index = map->queues[0]; | |
3230 | else | |
3231 | queue_index = map->queues[reciprocal_scale(skb_get_hash(skb), | |
3232 | map->len)]; | |
3233 | if (unlikely(queue_index >= dev->real_num_tx_queues)) | |
3234 | queue_index = -1; | |
3235 | } | |
3236 | } | |
3237 | rcu_read_unlock(); | |
3238 | ||
3239 | return queue_index; | |
3240 | #else | |
3241 | return -1; | |
3242 | #endif | |
3243 | } | |
3244 | ||
3245 | static u16 __netdev_pick_tx(struct net_device *dev, struct sk_buff *skb) | |
3246 | { | |
3247 | struct sock *sk = skb->sk; | |
3248 | int queue_index = sk_tx_queue_get(sk); | |
3249 | ||
3250 | if (queue_index < 0 || skb->ooo_okay || | |
3251 | queue_index >= dev->real_num_tx_queues) { | |
3252 | int new_index = get_xps_queue(dev, skb); | |
f4563a75 | 3253 | |
638b2a69 JP |
3254 | if (new_index < 0) |
3255 | new_index = skb_tx_hash(dev, skb); | |
3256 | ||
3257 | if (queue_index != new_index && sk && | |
004a5d01 | 3258 | sk_fullsock(sk) && |
638b2a69 JP |
3259 | rcu_access_pointer(sk->sk_dst_cache)) |
3260 | sk_tx_queue_set(sk, new_index); | |
3261 | ||
3262 | queue_index = new_index; | |
3263 | } | |
3264 | ||
3265 | return queue_index; | |
3266 | } | |
3267 | ||
3268 | struct netdev_queue *netdev_pick_tx(struct net_device *dev, | |
3269 | struct sk_buff *skb, | |
3270 | void *accel_priv) | |
3271 | { | |
3272 | int queue_index = 0; | |
3273 | ||
3274 | #ifdef CONFIG_XPS | |
52bd2d62 ED |
3275 | u32 sender_cpu = skb->sender_cpu - 1; |
3276 | ||
3277 | if (sender_cpu >= (u32)NR_CPUS) | |
638b2a69 JP |
3278 | skb->sender_cpu = raw_smp_processor_id() + 1; |
3279 | #endif | |
3280 | ||
3281 | if (dev->real_num_tx_queues != 1) { | |
3282 | const struct net_device_ops *ops = dev->netdev_ops; | |
f4563a75 | 3283 | |
638b2a69 JP |
3284 | if (ops->ndo_select_queue) |
3285 | queue_index = ops->ndo_select_queue(dev, skb, accel_priv, | |
3286 | __netdev_pick_tx); | |
3287 | else | |
3288 | queue_index = __netdev_pick_tx(dev, skb); | |
3289 | ||
3290 | if (!accel_priv) | |
3291 | queue_index = netdev_cap_txqueue(dev, queue_index); | |
3292 | } | |
3293 | ||
3294 | skb_set_queue_mapping(skb, queue_index); | |
3295 | return netdev_get_tx_queue(dev, queue_index); | |
3296 | } | |
3297 | ||
d29f749e | 3298 | /** |
9d08dd3d | 3299 | * __dev_queue_xmit - transmit a buffer |
d29f749e | 3300 | * @skb: buffer to transmit |
9d08dd3d | 3301 | * @accel_priv: private data used for L2 forwarding offload |
d29f749e DJ |
3302 | * |
3303 | * Queue a buffer for transmission to a network device. The caller must | |
3304 | * have set the device and priority and built the buffer before calling | |
3305 | * this function. The function can be called from an interrupt. | |
3306 | * | |
3307 | * A negative errno code is returned on a failure. A success does not | |
3308 | * guarantee the frame will be transmitted as it may be dropped due | |
3309 | * to congestion or traffic shaping. | |
3310 | * | |
3311 | * ----------------------------------------------------------------------------------- | |
3312 | * I notice this method can also return errors from the queue disciplines, | |
3313 | * including NET_XMIT_DROP, which is a positive value. So, errors can also | |
3314 | * be positive. | |
3315 | * | |
3316 | * Regardless of the return value, the skb is consumed, so it is currently | |
3317 | * difficult to retry a send to this method. (You can bump the ref count | |
3318 | * before sending to hold a reference for retry if you are careful.) | |
3319 | * | |
3320 | * When calling this method, interrupts MUST be enabled. This is because | |
3321 | * the BH enable code must have IRQs enabled so that it will not deadlock. | |
3322 | * --BLG | |
3323 | */ | |
0a59f3a9 | 3324 | static int __dev_queue_xmit(struct sk_buff *skb, void *accel_priv) |
1da177e4 LT |
3325 | { |
3326 | struct net_device *dev = skb->dev; | |
dc2b4847 | 3327 | struct netdev_queue *txq; |
1da177e4 LT |
3328 | struct Qdisc *q; |
3329 | int rc = -ENOMEM; | |
3330 | ||
6d1ccff6 ED |
3331 | skb_reset_mac_header(skb); |
3332 | ||
e7fd2885 WB |
3333 | if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_SCHED_TSTAMP)) |
3334 | __skb_tstamp_tx(skb, NULL, skb->sk, SCM_TSTAMP_SCHED); | |
3335 | ||
4ec93edb YH |
3336 | /* Disable soft irqs for various locks below. Also |
3337 | * stops preemption for RCU. | |
1da177e4 | 3338 | */ |
4ec93edb | 3339 | rcu_read_lock_bh(); |
1da177e4 | 3340 | |
5bc1421e NH |
3341 | skb_update_prio(skb); |
3342 | ||
1f211a1b DB |
3343 | qdisc_pkt_len_init(skb); |
3344 | #ifdef CONFIG_NET_CLS_ACT | |
8dc07fdb | 3345 | skb->tc_at_ingress = 0; |
1f211a1b DB |
3346 | # ifdef CONFIG_NET_EGRESS |
3347 | if (static_key_false(&egress_needed)) { | |
3348 | skb = sch_handle_egress(skb, &rc, dev); | |
3349 | if (!skb) | |
3350 | goto out; | |
3351 | } | |
3352 | # endif | |
3353 | #endif | |
02875878 ED |
3354 | /* If device/qdisc don't need skb->dst, release it right now while |
3355 | * its hot in this cpu cache. | |
3356 | */ | |
3357 | if (dev->priv_flags & IFF_XMIT_DST_RELEASE) | |
3358 | skb_dst_drop(skb); | |
3359 | else | |
3360 | skb_dst_force(skb); | |
3361 | ||
f663dd9a | 3362 | txq = netdev_pick_tx(dev, skb, accel_priv); |
a898def2 | 3363 | q = rcu_dereference_bh(txq->qdisc); |
37437bb2 | 3364 | |
cf66ba58 | 3365 | trace_net_dev_queue(skb); |
1da177e4 | 3366 | if (q->enqueue) { |
bbd8a0d3 | 3367 | rc = __dev_xmit_skb(skb, q, dev, txq); |
37437bb2 | 3368 | goto out; |
1da177e4 LT |
3369 | } |
3370 | ||
3371 | /* The device has no queue. Common case for software devices: | |
eb13da1a | 3372 | * loopback, all the sorts of tunnels... |
1da177e4 | 3373 | |
eb13da1a | 3374 | * Really, it is unlikely that netif_tx_lock protection is necessary |
3375 | * here. (f.e. loopback and IP tunnels are clean ignoring statistics | |
3376 | * counters.) | |
3377 | * However, it is possible, that they rely on protection | |
3378 | * made by us here. | |
1da177e4 | 3379 | |
eb13da1a | 3380 | * Check this and shot the lock. It is not prone from deadlocks. |
3381 | *Either shot noqueue qdisc, it is even simpler 8) | |
1da177e4 LT |
3382 | */ |
3383 | if (dev->flags & IFF_UP) { | |
3384 | int cpu = smp_processor_id(); /* ok because BHs are off */ | |
3385 | ||
c773e847 | 3386 | if (txq->xmit_lock_owner != cpu) { |
a70b506e DB |
3387 | if (unlikely(__this_cpu_read(xmit_recursion) > |
3388 | XMIT_RECURSION_LIMIT)) | |
745e20f1 ED |
3389 | goto recursion_alert; |
3390 | ||
1f59533f JDB |
3391 | skb = validate_xmit_skb(skb, dev); |
3392 | if (!skb) | |
d21fd63e | 3393 | goto out; |
1f59533f | 3394 | |
c773e847 | 3395 | HARD_TX_LOCK(dev, txq, cpu); |
1da177e4 | 3396 | |
73466498 | 3397 | if (!netif_xmit_stopped(txq)) { |
745e20f1 | 3398 | __this_cpu_inc(xmit_recursion); |
ce93718f | 3399 | skb = dev_hard_start_xmit(skb, dev, txq, &rc); |
745e20f1 | 3400 | __this_cpu_dec(xmit_recursion); |
572a9d7b | 3401 | if (dev_xmit_complete(rc)) { |
c773e847 | 3402 | HARD_TX_UNLOCK(dev, txq); |
1da177e4 LT |
3403 | goto out; |
3404 | } | |
3405 | } | |
c773e847 | 3406 | HARD_TX_UNLOCK(dev, txq); |
e87cc472 JP |
3407 | net_crit_ratelimited("Virtual device %s asks to queue packet!\n", |
3408 | dev->name); | |
1da177e4 LT |
3409 | } else { |
3410 | /* Recursion is detected! It is possible, | |
745e20f1 ED |
3411 | * unfortunately |
3412 | */ | |
3413 | recursion_alert: | |
e87cc472 JP |
3414 | net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n", |
3415 | dev->name); | |
1da177e4 LT |
3416 | } |
3417 | } | |
3418 | ||
3419 | rc = -ENETDOWN; | |
d4828d85 | 3420 | rcu_read_unlock_bh(); |
1da177e4 | 3421 | |
015f0688 | 3422 | atomic_long_inc(&dev->tx_dropped); |
1f59533f | 3423 | kfree_skb_list(skb); |
1da177e4 LT |
3424 | return rc; |
3425 | out: | |
d4828d85 | 3426 | rcu_read_unlock_bh(); |
1da177e4 LT |
3427 | return rc; |
3428 | } | |
f663dd9a | 3429 | |
2b4aa3ce | 3430 | int dev_queue_xmit(struct sk_buff *skb) |
f663dd9a JW |
3431 | { |
3432 | return __dev_queue_xmit(skb, NULL); | |
3433 | } | |
2b4aa3ce | 3434 | EXPORT_SYMBOL(dev_queue_xmit); |
1da177e4 | 3435 | |
f663dd9a JW |
3436 | int dev_queue_xmit_accel(struct sk_buff *skb, void *accel_priv) |
3437 | { | |
3438 | return __dev_queue_xmit(skb, accel_priv); | |
3439 | } | |
3440 | EXPORT_SYMBOL(dev_queue_xmit_accel); | |
3441 | ||
1da177e4 | 3442 | |
eb13da1a | 3443 | /************************************************************************* |
3444 | * Receiver routines | |
3445 | *************************************************************************/ | |
1da177e4 | 3446 | |
6b2bedc3 | 3447 | int netdev_max_backlog __read_mostly = 1000; |
c9e6bc64 ED |
3448 | EXPORT_SYMBOL(netdev_max_backlog); |
3449 | ||
3b098e2d | 3450 | int netdev_tstamp_prequeue __read_mostly = 1; |
6b2bedc3 | 3451 | int netdev_budget __read_mostly = 300; |
7acf8a1e | 3452 | unsigned int __read_mostly netdev_budget_usecs = 2000; |
3d48b53f MT |
3453 | int weight_p __read_mostly = 64; /* old backlog weight */ |
3454 | int dev_weight_rx_bias __read_mostly = 1; /* bias for backlog weight */ | |
3455 | int dev_weight_tx_bias __read_mostly = 1; /* bias for output_queue quota */ | |
3456 | int dev_rx_weight __read_mostly = 64; | |
3457 | int dev_tx_weight __read_mostly = 64; | |
1da177e4 | 3458 | |
eecfd7c4 ED |
3459 | /* Called with irq disabled */ |
3460 | static inline void ____napi_schedule(struct softnet_data *sd, | |
3461 | struct napi_struct *napi) | |
3462 | { | |
3463 | list_add_tail(&napi->poll_list, &sd->poll_list); | |
3464 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); | |
3465 | } | |
3466 | ||
bfb564e7 KK |
3467 | #ifdef CONFIG_RPS |
3468 | ||
3469 | /* One global table that all flow-based protocols share. */ | |
6e3f7faf | 3470 | struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly; |
bfb564e7 | 3471 | EXPORT_SYMBOL(rps_sock_flow_table); |
567e4b79 ED |
3472 | u32 rps_cpu_mask __read_mostly; |
3473 | EXPORT_SYMBOL(rps_cpu_mask); | |
bfb564e7 | 3474 | |
c5905afb | 3475 | struct static_key rps_needed __read_mostly; |
3df97ba8 | 3476 | EXPORT_SYMBOL(rps_needed); |
13bfff25 ED |
3477 | struct static_key rfs_needed __read_mostly; |
3478 | EXPORT_SYMBOL(rfs_needed); | |
adc9300e | 3479 | |
c445477d BH |
3480 | static struct rps_dev_flow * |
3481 | set_rps_cpu(struct net_device *dev, struct sk_buff *skb, | |
3482 | struct rps_dev_flow *rflow, u16 next_cpu) | |
3483 | { | |
a31196b0 | 3484 | if (next_cpu < nr_cpu_ids) { |
c445477d BH |
3485 | #ifdef CONFIG_RFS_ACCEL |
3486 | struct netdev_rx_queue *rxqueue; | |
3487 | struct rps_dev_flow_table *flow_table; | |
3488 | struct rps_dev_flow *old_rflow; | |
3489 | u32 flow_id; | |
3490 | u16 rxq_index; | |
3491 | int rc; | |
3492 | ||
3493 | /* Should we steer this flow to a different hardware queue? */ | |
69a19ee6 BH |
3494 | if (!skb_rx_queue_recorded(skb) || !dev->rx_cpu_rmap || |
3495 | !(dev->features & NETIF_F_NTUPLE)) | |
c445477d BH |
3496 | goto out; |
3497 | rxq_index = cpu_rmap_lookup_index(dev->rx_cpu_rmap, next_cpu); | |
3498 | if (rxq_index == skb_get_rx_queue(skb)) | |
3499 | goto out; | |
3500 | ||
3501 | rxqueue = dev->_rx + rxq_index; | |
3502 | flow_table = rcu_dereference(rxqueue->rps_flow_table); | |
3503 | if (!flow_table) | |
3504 | goto out; | |
61b905da | 3505 | flow_id = skb_get_hash(skb) & flow_table->mask; |
c445477d BH |
3506 | rc = dev->netdev_ops->ndo_rx_flow_steer(dev, skb, |
3507 | rxq_index, flow_id); | |
3508 | if (rc < 0) | |
3509 | goto out; | |
3510 | old_rflow = rflow; | |
3511 | rflow = &flow_table->flows[flow_id]; | |
c445477d BH |
3512 | rflow->filter = rc; |
3513 | if (old_rflow->filter == rflow->filter) | |
3514 | old_rflow->filter = RPS_NO_FILTER; | |
3515 | out: | |
3516 | #endif | |
3517 | rflow->last_qtail = | |
09994d1b | 3518 | per_cpu(softnet_data, next_cpu).input_queue_head; |
c445477d BH |
3519 | } |
3520 | ||
09994d1b | 3521 | rflow->cpu = next_cpu; |
c445477d BH |
3522 | return rflow; |
3523 | } | |
3524 | ||
bfb564e7 KK |
3525 | /* |
3526 | * get_rps_cpu is called from netif_receive_skb and returns the target | |
3527 | * CPU from the RPS map of the receiving queue for a given skb. | |
3528 | * rcu_read_lock must be held on entry. | |
3529 | */ | |
3530 | static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb, | |
3531 | struct rps_dev_flow **rflowp) | |
3532 | { | |
567e4b79 ED |
3533 | const struct rps_sock_flow_table *sock_flow_table; |
3534 | struct netdev_rx_queue *rxqueue = dev->_rx; | |
bfb564e7 | 3535 | struct rps_dev_flow_table *flow_table; |
567e4b79 | 3536 | struct rps_map *map; |
bfb564e7 | 3537 | int cpu = -1; |
567e4b79 | 3538 | u32 tcpu; |
61b905da | 3539 | u32 hash; |
bfb564e7 KK |
3540 | |
3541 | if (skb_rx_queue_recorded(skb)) { | |
3542 | u16 index = skb_get_rx_queue(skb); | |
567e4b79 | 3543 | |
62fe0b40 BH |
3544 | if (unlikely(index >= dev->real_num_rx_queues)) { |
3545 | WARN_ONCE(dev->real_num_rx_queues > 1, | |
3546 | "%s received packet on queue %u, but number " | |
3547 | "of RX queues is %u\n", | |
3548 | dev->name, index, dev->real_num_rx_queues); | |
bfb564e7 KK |
3549 | goto done; |
3550 | } | |
567e4b79 ED |
3551 | rxqueue += index; |
3552 | } | |
bfb564e7 | 3553 | |
567e4b79 ED |
3554 | /* Avoid computing hash if RFS/RPS is not active for this rxqueue */ |
3555 | ||
3556 | flow_table = rcu_dereference(rxqueue->rps_flow_table); | |
6e3f7faf | 3557 | map = rcu_dereference(rxqueue->rps_map); |
567e4b79 | 3558 | if (!flow_table && !map) |
bfb564e7 KK |
3559 | goto done; |
3560 | ||
2d47b459 | 3561 | skb_reset_network_header(skb); |
61b905da TH |
3562 | hash = skb_get_hash(skb); |
3563 | if (!hash) | |
bfb564e7 KK |
3564 | goto done; |
3565 | ||
fec5e652 TH |
3566 | sock_flow_table = rcu_dereference(rps_sock_flow_table); |
3567 | if (flow_table && sock_flow_table) { | |
fec5e652 | 3568 | struct rps_dev_flow *rflow; |
567e4b79 ED |
3569 | u32 next_cpu; |
3570 | u32 ident; | |
3571 | ||
3572 | /* First check into global flow table if there is a match */ | |
3573 | ident = sock_flow_table->ents[hash & sock_flow_table->mask]; | |
3574 | if ((ident ^ hash) & ~rps_cpu_mask) | |
3575 | goto try_rps; | |
fec5e652 | 3576 | |
567e4b79 ED |
3577 | next_cpu = ident & rps_cpu_mask; |
3578 | ||
3579 | /* OK, now we know there is a match, | |
3580 | * we can look at the local (per receive queue) flow table | |
3581 | */ | |
61b905da | 3582 | rflow = &flow_table->flows[hash & flow_table->mask]; |
fec5e652 TH |
3583 | tcpu = rflow->cpu; |
3584 | ||
fec5e652 TH |
3585 | /* |
3586 | * If the desired CPU (where last recvmsg was done) is | |
3587 | * different from current CPU (one in the rx-queue flow | |
3588 | * table entry), switch if one of the following holds: | |
a31196b0 | 3589 | * - Current CPU is unset (>= nr_cpu_ids). |
fec5e652 TH |
3590 | * - Current CPU is offline. |
3591 | * - The current CPU's queue tail has advanced beyond the | |
3592 | * last packet that was enqueued using this table entry. | |
3593 | * This guarantees that all previous packets for the flow | |
3594 | * have been dequeued, thus preserving in order delivery. | |
3595 | */ | |
3596 | if (unlikely(tcpu != next_cpu) && | |
a31196b0 | 3597 | (tcpu >= nr_cpu_ids || !cpu_online(tcpu) || |
fec5e652 | 3598 | ((int)(per_cpu(softnet_data, tcpu).input_queue_head - |
baefa31d TH |
3599 | rflow->last_qtail)) >= 0)) { |
3600 | tcpu = next_cpu; | |
c445477d | 3601 | rflow = set_rps_cpu(dev, skb, rflow, next_cpu); |
baefa31d | 3602 | } |
c445477d | 3603 | |
a31196b0 | 3604 | if (tcpu < nr_cpu_ids && cpu_online(tcpu)) { |
fec5e652 TH |
3605 | *rflowp = rflow; |
3606 | cpu = tcpu; | |
3607 | goto done; | |
3608 | } | |
3609 | } | |
3610 | ||
567e4b79 ED |
3611 | try_rps: |
3612 | ||
0a9627f2 | 3613 | if (map) { |
8fc54f68 | 3614 | tcpu = map->cpus[reciprocal_scale(hash, map->len)]; |
0a9627f2 TH |
3615 | if (cpu_online(tcpu)) { |
3616 | cpu = tcpu; | |
3617 | goto done; | |
3618 | } | |
3619 | } | |
3620 | ||
3621 | done: | |
0a9627f2 TH |
3622 | return cpu; |
3623 | } | |
3624 | ||
c445477d BH |
3625 | #ifdef CONFIG_RFS_ACCEL |
3626 | ||
3627 | /** | |
3628 | * rps_may_expire_flow - check whether an RFS hardware filter may be removed | |
3629 | * @dev: Device on which the filter was set | |
3630 | * @rxq_index: RX queue index | |
3631 | * @flow_id: Flow ID passed to ndo_rx_flow_steer() | |
3632 | * @filter_id: Filter ID returned by ndo_rx_flow_steer() | |
3633 | * | |
3634 | * Drivers that implement ndo_rx_flow_steer() should periodically call | |
3635 | * this function for each installed filter and remove the filters for | |
3636 | * which it returns %true. | |
3637 | */ | |
3638 | bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index, | |
3639 | u32 flow_id, u16 filter_id) | |
3640 | { | |
3641 | struct netdev_rx_queue *rxqueue = dev->_rx + rxq_index; | |
3642 | struct rps_dev_flow_table *flow_table; | |
3643 | struct rps_dev_flow *rflow; | |
3644 | bool expire = true; | |
a31196b0 | 3645 | unsigned int cpu; |
c445477d BH |
3646 | |
3647 | rcu_read_lock(); | |
3648 | flow_table = rcu_dereference(rxqueue->rps_flow_table); | |
3649 | if (flow_table && flow_id <= flow_table->mask) { | |
3650 | rflow = &flow_table->flows[flow_id]; | |
3651 | cpu = ACCESS_ONCE(rflow->cpu); | |
a31196b0 | 3652 | if (rflow->filter == filter_id && cpu < nr_cpu_ids && |
c445477d BH |
3653 | ((int)(per_cpu(softnet_data, cpu).input_queue_head - |
3654 | rflow->last_qtail) < | |
3655 | (int)(10 * flow_table->mask))) | |
3656 | expire = false; | |
3657 | } | |
3658 | rcu_read_unlock(); | |
3659 | return expire; | |
3660 | } | |
3661 | EXPORT_SYMBOL(rps_may_expire_flow); | |
3662 | ||
3663 | #endif /* CONFIG_RFS_ACCEL */ | |
3664 | ||
0a9627f2 | 3665 | /* Called from hardirq (IPI) context */ |
e36fa2f7 | 3666 | static void rps_trigger_softirq(void *data) |
0a9627f2 | 3667 | { |
e36fa2f7 ED |
3668 | struct softnet_data *sd = data; |
3669 | ||
eecfd7c4 | 3670 | ____napi_schedule(sd, &sd->backlog); |
dee42870 | 3671 | sd->received_rps++; |
0a9627f2 | 3672 | } |
e36fa2f7 | 3673 | |
fec5e652 | 3674 | #endif /* CONFIG_RPS */ |
0a9627f2 | 3675 | |
e36fa2f7 ED |
3676 | /* |
3677 | * Check if this softnet_data structure is another cpu one | |
3678 | * If yes, queue it to our IPI list and return 1 | |
3679 | * If no, return 0 | |
3680 | */ | |
3681 | static int rps_ipi_queued(struct softnet_data *sd) | |
3682 | { | |
3683 | #ifdef CONFIG_RPS | |
903ceff7 | 3684 | struct softnet_data *mysd = this_cpu_ptr(&softnet_data); |
e36fa2f7 ED |
3685 | |
3686 | if (sd != mysd) { | |
3687 | sd->rps_ipi_next = mysd->rps_ipi_list; | |
3688 | mysd->rps_ipi_list = sd; | |
3689 | ||
3690 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); | |
3691 | return 1; | |
3692 | } | |
3693 | #endif /* CONFIG_RPS */ | |
3694 | return 0; | |
3695 | } | |
3696 | ||
99bbc707 WB |
3697 | #ifdef CONFIG_NET_FLOW_LIMIT |
3698 | int netdev_flow_limit_table_len __read_mostly = (1 << 12); | |
3699 | #endif | |
3700 | ||
3701 | static bool skb_flow_limit(struct sk_buff *skb, unsigned int qlen) | |
3702 | { | |
3703 | #ifdef CONFIG_NET_FLOW_LIMIT | |
3704 | struct sd_flow_limit *fl; | |
3705 | struct softnet_data *sd; | |
3706 | unsigned int old_flow, new_flow; | |
3707 | ||
3708 | if (qlen < (netdev_max_backlog >> 1)) | |
3709 | return false; | |
3710 | ||
903ceff7 | 3711 | sd = this_cpu_ptr(&softnet_data); |
99bbc707 WB |
3712 | |
3713 | rcu_read_lock(); | |
3714 | fl = rcu_dereference(sd->flow_limit); | |
3715 | if (fl) { | |
3958afa1 | 3716 | new_flow = skb_get_hash(skb) & (fl->num_buckets - 1); |
99bbc707 WB |
3717 | old_flow = fl->history[fl->history_head]; |
3718 | fl->history[fl->history_head] = new_flow; | |
3719 | ||
3720 | fl->history_head++; | |
3721 | fl->history_head &= FLOW_LIMIT_HISTORY - 1; | |
3722 | ||
3723 | if (likely(fl->buckets[old_flow])) | |
3724 | fl->buckets[old_flow]--; | |
3725 | ||
3726 | if (++fl->buckets[new_flow] > (FLOW_LIMIT_HISTORY >> 1)) { | |
3727 | fl->count++; | |
3728 | rcu_read_unlock(); | |
3729 | return true; | |
3730 | } | |
3731 | } | |
3732 | rcu_read_unlock(); | |
3733 | #endif | |
3734 | return false; | |
3735 | } | |
3736 | ||
0a9627f2 TH |
3737 | /* |
3738 | * enqueue_to_backlog is called to queue an skb to a per CPU backlog | |
3739 | * queue (may be a remote CPU queue). | |
3740 | */ | |
fec5e652 TH |
3741 | static int enqueue_to_backlog(struct sk_buff *skb, int cpu, |
3742 | unsigned int *qtail) | |
0a9627f2 | 3743 | { |
e36fa2f7 | 3744 | struct softnet_data *sd; |
0a9627f2 | 3745 | unsigned long flags; |
99bbc707 | 3746 | unsigned int qlen; |
0a9627f2 | 3747 | |
e36fa2f7 | 3748 | sd = &per_cpu(softnet_data, cpu); |
0a9627f2 TH |
3749 | |
3750 | local_irq_save(flags); | |
0a9627f2 | 3751 | |
e36fa2f7 | 3752 | rps_lock(sd); |
e9e4dd32 JA |
3753 | if (!netif_running(skb->dev)) |
3754 | goto drop; | |
99bbc707 WB |
3755 | qlen = skb_queue_len(&sd->input_pkt_queue); |
3756 | if (qlen <= netdev_max_backlog && !skb_flow_limit(skb, qlen)) { | |
e008f3f0 | 3757 | if (qlen) { |
0a9627f2 | 3758 | enqueue: |
e36fa2f7 | 3759 | __skb_queue_tail(&sd->input_pkt_queue, skb); |
76cc8b13 | 3760 | input_queue_tail_incr_save(sd, qtail); |
e36fa2f7 | 3761 | rps_unlock(sd); |
152102c7 | 3762 | local_irq_restore(flags); |
0a9627f2 TH |
3763 | return NET_RX_SUCCESS; |
3764 | } | |
3765 | ||
ebda37c2 ED |
3766 | /* Schedule NAPI for backlog device |
3767 | * We can use non atomic operation since we own the queue lock | |
3768 | */ | |
3769 | if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) { | |
e36fa2f7 | 3770 | if (!rps_ipi_queued(sd)) |
eecfd7c4 | 3771 | ____napi_schedule(sd, &sd->backlog); |
0a9627f2 TH |
3772 | } |
3773 | goto enqueue; | |
3774 | } | |
3775 | ||
e9e4dd32 | 3776 | drop: |
dee42870 | 3777 | sd->dropped++; |
e36fa2f7 | 3778 | rps_unlock(sd); |
0a9627f2 | 3779 | |
0a9627f2 TH |
3780 | local_irq_restore(flags); |
3781 | ||
caf586e5 | 3782 | atomic_long_inc(&skb->dev->rx_dropped); |
0a9627f2 TH |
3783 | kfree_skb(skb); |
3784 | return NET_RX_DROP; | |
3785 | } | |
1da177e4 | 3786 | |
ae78dbfa | 3787 | static int netif_rx_internal(struct sk_buff *skb) |
1da177e4 | 3788 | { |
b0e28f1e | 3789 | int ret; |
1da177e4 | 3790 | |
588f0330 | 3791 | net_timestamp_check(netdev_tstamp_prequeue, skb); |
1da177e4 | 3792 | |
cf66ba58 | 3793 | trace_netif_rx(skb); |
df334545 | 3794 | #ifdef CONFIG_RPS |
c5905afb | 3795 | if (static_key_false(&rps_needed)) { |
fec5e652 | 3796 | struct rps_dev_flow voidflow, *rflow = &voidflow; |
b0e28f1e ED |
3797 | int cpu; |
3798 | ||
cece1945 | 3799 | preempt_disable(); |
b0e28f1e | 3800 | rcu_read_lock(); |
fec5e652 TH |
3801 | |
3802 | cpu = get_rps_cpu(skb->dev, skb, &rflow); | |
b0e28f1e ED |
3803 | if (cpu < 0) |
3804 | cpu = smp_processor_id(); | |
fec5e652 TH |
3805 | |
3806 | ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail); | |
3807 | ||
b0e28f1e | 3808 | rcu_read_unlock(); |
cece1945 | 3809 | preempt_enable(); |
adc9300e ED |
3810 | } else |
3811 | #endif | |
fec5e652 TH |
3812 | { |
3813 | unsigned int qtail; | |
f4563a75 | 3814 | |
fec5e652 TH |
3815 | ret = enqueue_to_backlog(skb, get_cpu(), &qtail); |
3816 | put_cpu(); | |
3817 | } | |
b0e28f1e | 3818 | return ret; |
1da177e4 | 3819 | } |
ae78dbfa BH |
3820 | |
3821 | /** | |
3822 | * netif_rx - post buffer to the network code | |
3823 | * @skb: buffer to post | |
3824 | * | |
3825 | * This function receives a packet from a device driver and queues it for | |
3826 | * the upper (protocol) levels to process. It always succeeds. The buffer | |
3827 | * may be dropped during processing for congestion control or by the | |
3828 | * protocol layers. | |
3829 | * | |
3830 | * return values: | |
3831 | * NET_RX_SUCCESS (no congestion) | |
3832 | * NET_RX_DROP (packet was dropped) | |
3833 | * | |
3834 | */ | |
3835 | ||
3836 | int netif_rx(struct sk_buff *skb) | |
3837 | { | |
3838 | trace_netif_rx_entry(skb); | |
3839 | ||
3840 | return netif_rx_internal(skb); | |
3841 | } | |
d1b19dff | 3842 | EXPORT_SYMBOL(netif_rx); |
1da177e4 LT |
3843 | |
3844 | int netif_rx_ni(struct sk_buff *skb) | |
3845 | { | |
3846 | int err; | |
3847 | ||
ae78dbfa BH |
3848 | trace_netif_rx_ni_entry(skb); |
3849 | ||
1da177e4 | 3850 | preempt_disable(); |
ae78dbfa | 3851 | err = netif_rx_internal(skb); |
1da177e4 LT |
3852 | if (local_softirq_pending()) |
3853 | do_softirq(); | |
3854 | preempt_enable(); | |
3855 | ||
3856 | return err; | |
3857 | } | |
1da177e4 LT |
3858 | EXPORT_SYMBOL(netif_rx_ni); |
3859 | ||
0766f788 | 3860 | static __latent_entropy void net_tx_action(struct softirq_action *h) |
1da177e4 | 3861 | { |
903ceff7 | 3862 | struct softnet_data *sd = this_cpu_ptr(&softnet_data); |
1da177e4 LT |
3863 | |
3864 | if (sd->completion_queue) { | |
3865 | struct sk_buff *clist; | |
3866 | ||
3867 | local_irq_disable(); | |
3868 | clist = sd->completion_queue; | |
3869 | sd->completion_queue = NULL; | |
3870 | local_irq_enable(); | |
3871 | ||
3872 | while (clist) { | |
3873 | struct sk_buff *skb = clist; | |
f4563a75 | 3874 | |
1da177e4 LT |
3875 | clist = clist->next; |
3876 | ||
547b792c | 3877 | WARN_ON(atomic_read(&skb->users)); |
e6247027 ED |
3878 | if (likely(get_kfree_skb_cb(skb)->reason == SKB_REASON_CONSUMED)) |
3879 | trace_consume_skb(skb); | |
3880 | else | |
3881 | trace_kfree_skb(skb, net_tx_action); | |
15fad714 JDB |
3882 | |
3883 | if (skb->fclone != SKB_FCLONE_UNAVAILABLE) | |
3884 | __kfree_skb(skb); | |
3885 | else | |
3886 | __kfree_skb_defer(skb); | |
1da177e4 | 3887 | } |
15fad714 JDB |
3888 | |
3889 | __kfree_skb_flush(); | |
1da177e4 LT |
3890 | } |
3891 | ||
3892 | if (sd->output_queue) { | |
37437bb2 | 3893 | struct Qdisc *head; |
1da177e4 LT |
3894 | |
3895 | local_irq_disable(); | |
3896 | head = sd->output_queue; | |
3897 | sd->output_queue = NULL; | |
a9cbd588 | 3898 | sd->output_queue_tailp = &sd->output_queue; |
1da177e4 LT |
3899 | local_irq_enable(); |
3900 | ||
3901 | while (head) { | |
37437bb2 DM |
3902 | struct Qdisc *q = head; |
3903 | spinlock_t *root_lock; | |
3904 | ||
1da177e4 LT |
3905 | head = head->next_sched; |
3906 | ||
5fb66229 | 3907 | root_lock = qdisc_lock(q); |
3bcb846c ED |
3908 | spin_lock(root_lock); |
3909 | /* We need to make sure head->next_sched is read | |
3910 | * before clearing __QDISC_STATE_SCHED | |
3911 | */ | |
3912 | smp_mb__before_atomic(); | |
3913 | clear_bit(__QDISC_STATE_SCHED, &q->state); | |
3914 | qdisc_run(q); | |
3915 | spin_unlock(root_lock); | |
1da177e4 LT |
3916 | } |
3917 | } | |
3918 | } | |
3919 | ||
181402a5 | 3920 | #if IS_ENABLED(CONFIG_BRIDGE) && IS_ENABLED(CONFIG_ATM_LANE) |
da678292 MM |
3921 | /* This hook is defined here for ATM LANE */ |
3922 | int (*br_fdb_test_addr_hook)(struct net_device *dev, | |
3923 | unsigned char *addr) __read_mostly; | |
4fb019a0 | 3924 | EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook); |
da678292 | 3925 | #endif |
1da177e4 | 3926 | |
1f211a1b DB |
3927 | static inline struct sk_buff * |
3928 | sch_handle_ingress(struct sk_buff *skb, struct packet_type **pt_prev, int *ret, | |
3929 | struct net_device *orig_dev) | |
f697c3e8 | 3930 | { |
e7582bab | 3931 | #ifdef CONFIG_NET_CLS_ACT |
d2788d34 DB |
3932 | struct tcf_proto *cl = rcu_dereference_bh(skb->dev->ingress_cl_list); |
3933 | struct tcf_result cl_res; | |
24824a09 | 3934 | |
c9e99fd0 DB |
3935 | /* If there's at least one ingress present somewhere (so |
3936 | * we get here via enabled static key), remaining devices | |
3937 | * that are not configured with an ingress qdisc will bail | |
d2788d34 | 3938 | * out here. |
c9e99fd0 | 3939 | */ |
d2788d34 | 3940 | if (!cl) |
4577139b | 3941 | return skb; |
f697c3e8 HX |
3942 | if (*pt_prev) { |
3943 | *ret = deliver_skb(skb, *pt_prev, orig_dev); | |
3944 | *pt_prev = NULL; | |
1da177e4 LT |
3945 | } |
3946 | ||
3365495c | 3947 | qdisc_skb_cb(skb)->pkt_len = skb->len; |
8dc07fdb | 3948 | skb->tc_at_ingress = 1; |
24ea591d | 3949 | qdisc_bstats_cpu_update(cl->q, skb); |
c9e99fd0 | 3950 | |
3b3ae880 | 3951 | switch (tc_classify(skb, cl, &cl_res, false)) { |
d2788d34 DB |
3952 | case TC_ACT_OK: |
3953 | case TC_ACT_RECLASSIFY: | |
3954 | skb->tc_index = TC_H_MIN(cl_res.classid); | |
3955 | break; | |
3956 | case TC_ACT_SHOT: | |
24ea591d | 3957 | qdisc_qstats_cpu_drop(cl->q); |
8a3a4c6e ED |
3958 | kfree_skb(skb); |
3959 | return NULL; | |
d2788d34 DB |
3960 | case TC_ACT_STOLEN: |
3961 | case TC_ACT_QUEUED: | |
8a3a4c6e | 3962 | consume_skb(skb); |
d2788d34 | 3963 | return NULL; |
27b29f63 AS |
3964 | case TC_ACT_REDIRECT: |
3965 | /* skb_mac_header check was done by cls/act_bpf, so | |
3966 | * we can safely push the L2 header back before | |
3967 | * redirecting to another netdev | |
3968 | */ | |
3969 | __skb_push(skb, skb->mac_len); | |
3970 | skb_do_redirect(skb); | |
3971 | return NULL; | |
d2788d34 DB |
3972 | default: |
3973 | break; | |
f697c3e8 | 3974 | } |
e7582bab | 3975 | #endif /* CONFIG_NET_CLS_ACT */ |
e687ad60 PN |
3976 | return skb; |
3977 | } | |
1da177e4 | 3978 | |
24b27fc4 MB |
3979 | /** |
3980 | * netdev_is_rx_handler_busy - check if receive handler is registered | |
3981 | * @dev: device to check | |
3982 | * | |
3983 | * Check if a receive handler is already registered for a given device. | |
3984 | * Return true if there one. | |
3985 | * | |
3986 | * The caller must hold the rtnl_mutex. | |
3987 | */ | |
3988 | bool netdev_is_rx_handler_busy(struct net_device *dev) | |
3989 | { | |
3990 | ASSERT_RTNL(); | |
3991 | return dev && rtnl_dereference(dev->rx_handler); | |
3992 | } | |
3993 | EXPORT_SYMBOL_GPL(netdev_is_rx_handler_busy); | |
3994 | ||
ab95bfe0 JP |
3995 | /** |
3996 | * netdev_rx_handler_register - register receive handler | |
3997 | * @dev: device to register a handler for | |
3998 | * @rx_handler: receive handler to register | |
93e2c32b | 3999 | * @rx_handler_data: data pointer that is used by rx handler |
ab95bfe0 | 4000 | * |
e227867f | 4001 | * Register a receive handler for a device. This handler will then be |
ab95bfe0 JP |
4002 | * called from __netif_receive_skb. A negative errno code is returned |
4003 | * on a failure. | |
4004 | * | |
4005 | * The caller must hold the rtnl_mutex. | |
8a4eb573 JP |
4006 | * |
4007 | * For a general description of rx_handler, see enum rx_handler_result. | |
ab95bfe0 JP |
4008 | */ |
4009 | int netdev_rx_handler_register(struct net_device *dev, | |
93e2c32b JP |
4010 | rx_handler_func_t *rx_handler, |
4011 | void *rx_handler_data) | |
ab95bfe0 | 4012 | { |
1b7cd004 | 4013 | if (netdev_is_rx_handler_busy(dev)) |
ab95bfe0 JP |
4014 | return -EBUSY; |
4015 | ||
00cfec37 | 4016 | /* Note: rx_handler_data must be set before rx_handler */ |
93e2c32b | 4017 | rcu_assign_pointer(dev->rx_handler_data, rx_handler_data); |
ab95bfe0 JP |
4018 | rcu_assign_pointer(dev->rx_handler, rx_handler); |
4019 | ||
4020 | return 0; | |
4021 | } | |
4022 | EXPORT_SYMBOL_GPL(netdev_rx_handler_register); | |
4023 | ||
4024 | /** | |
4025 | * netdev_rx_handler_unregister - unregister receive handler | |
4026 | * @dev: device to unregister a handler from | |
4027 | * | |
166ec369 | 4028 | * Unregister a receive handler from a device. |
ab95bfe0 JP |
4029 | * |
4030 | * The caller must hold the rtnl_mutex. | |
4031 | */ | |
4032 | void netdev_rx_handler_unregister(struct net_device *dev) | |
4033 | { | |
4034 | ||
4035 | ASSERT_RTNL(); | |
a9b3cd7f | 4036 | RCU_INIT_POINTER(dev->rx_handler, NULL); |
00cfec37 ED |
4037 | /* a reader seeing a non NULL rx_handler in a rcu_read_lock() |
4038 | * section has a guarantee to see a non NULL rx_handler_data | |
4039 | * as well. | |
4040 | */ | |
4041 | synchronize_net(); | |
a9b3cd7f | 4042 | RCU_INIT_POINTER(dev->rx_handler_data, NULL); |
ab95bfe0 JP |
4043 | } |
4044 | EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister); | |
4045 | ||
b4b9e355 MG |
4046 | /* |
4047 | * Limit the use of PFMEMALLOC reserves to those protocols that implement | |
4048 | * the special handling of PFMEMALLOC skbs. | |
4049 | */ | |
4050 | static bool skb_pfmemalloc_protocol(struct sk_buff *skb) | |
4051 | { | |
4052 | switch (skb->protocol) { | |
2b8837ae JP |
4053 | case htons(ETH_P_ARP): |
4054 | case htons(ETH_P_IP): | |
4055 | case htons(ETH_P_IPV6): | |
4056 | case htons(ETH_P_8021Q): | |
4057 | case htons(ETH_P_8021AD): | |
b4b9e355 MG |
4058 | return true; |
4059 | default: | |
4060 | return false; | |
4061 | } | |
4062 | } | |
4063 | ||
e687ad60 PN |
4064 | static inline int nf_ingress(struct sk_buff *skb, struct packet_type **pt_prev, |
4065 | int *ret, struct net_device *orig_dev) | |
4066 | { | |
e7582bab | 4067 | #ifdef CONFIG_NETFILTER_INGRESS |
e687ad60 | 4068 | if (nf_hook_ingress_active(skb)) { |
2c1e2703 AC |
4069 | int ingress_retval; |
4070 | ||
e687ad60 PN |
4071 | if (*pt_prev) { |
4072 | *ret = deliver_skb(skb, *pt_prev, orig_dev); | |
4073 | *pt_prev = NULL; | |
4074 | } | |
4075 | ||
2c1e2703 AC |
4076 | rcu_read_lock(); |
4077 | ingress_retval = nf_hook_ingress(skb); | |
4078 | rcu_read_unlock(); | |
4079 | return ingress_retval; | |
e687ad60 | 4080 | } |
e7582bab | 4081 | #endif /* CONFIG_NETFILTER_INGRESS */ |
e687ad60 PN |
4082 | return 0; |
4083 | } | |
e687ad60 | 4084 | |
9754e293 | 4085 | static int __netif_receive_skb_core(struct sk_buff *skb, bool pfmemalloc) |
1da177e4 LT |
4086 | { |
4087 | struct packet_type *ptype, *pt_prev; | |
ab95bfe0 | 4088 | rx_handler_func_t *rx_handler; |
f2ccd8fa | 4089 | struct net_device *orig_dev; |
8a4eb573 | 4090 | bool deliver_exact = false; |
1da177e4 | 4091 | int ret = NET_RX_DROP; |
252e3346 | 4092 | __be16 type; |
1da177e4 | 4093 | |
588f0330 | 4094 | net_timestamp_check(!netdev_tstamp_prequeue, skb); |
81bbb3d4 | 4095 | |
cf66ba58 | 4096 | trace_netif_receive_skb(skb); |
9b22ea56 | 4097 | |
cc9bd5ce | 4098 | orig_dev = skb->dev; |
8f903c70 | 4099 | |
c1d2bbe1 | 4100 | skb_reset_network_header(skb); |
fda55eca ED |
4101 | if (!skb_transport_header_was_set(skb)) |
4102 | skb_reset_transport_header(skb); | |
0b5c9db1 | 4103 | skb_reset_mac_len(skb); |
1da177e4 LT |
4104 | |
4105 | pt_prev = NULL; | |
4106 | ||
63d8ea7f | 4107 | another_round: |
b6858177 | 4108 | skb->skb_iif = skb->dev->ifindex; |
63d8ea7f DM |
4109 | |
4110 | __this_cpu_inc(softnet_data.processed); | |
4111 | ||
8ad227ff PM |
4112 | if (skb->protocol == cpu_to_be16(ETH_P_8021Q) || |
4113 | skb->protocol == cpu_to_be16(ETH_P_8021AD)) { | |
0d5501c1 | 4114 | skb = skb_vlan_untag(skb); |
bcc6d479 | 4115 | if (unlikely(!skb)) |
2c17d27c | 4116 | goto out; |
bcc6d479 JP |
4117 | } |
4118 | ||
e7246e12 WB |
4119 | if (skb_skip_tc_classify(skb)) |
4120 | goto skip_classify; | |
1da177e4 | 4121 | |
9754e293 | 4122 | if (pfmemalloc) |
b4b9e355 MG |
4123 | goto skip_taps; |
4124 | ||
1da177e4 | 4125 | list_for_each_entry_rcu(ptype, &ptype_all, list) { |
7866a621 SN |
4126 | if (pt_prev) |
4127 | ret = deliver_skb(skb, pt_prev, orig_dev); | |
4128 | pt_prev = ptype; | |
4129 | } | |
4130 | ||
4131 | list_for_each_entry_rcu(ptype, &skb->dev->ptype_all, list) { | |
4132 | if (pt_prev) | |
4133 | ret = deliver_skb(skb, pt_prev, orig_dev); | |
4134 | pt_prev = ptype; | |
1da177e4 LT |
4135 | } |
4136 | ||
b4b9e355 | 4137 | skip_taps: |
1cf51900 | 4138 | #ifdef CONFIG_NET_INGRESS |
4577139b | 4139 | if (static_key_false(&ingress_needed)) { |
1f211a1b | 4140 | skb = sch_handle_ingress(skb, &pt_prev, &ret, orig_dev); |
4577139b | 4141 | if (!skb) |
2c17d27c | 4142 | goto out; |
e687ad60 PN |
4143 | |
4144 | if (nf_ingress(skb, &pt_prev, &ret, orig_dev) < 0) | |
2c17d27c | 4145 | goto out; |
4577139b | 4146 | } |
1cf51900 | 4147 | #endif |
a5135bcf | 4148 | skb_reset_tc(skb); |
e7246e12 | 4149 | skip_classify: |
9754e293 | 4150 | if (pfmemalloc && !skb_pfmemalloc_protocol(skb)) |
b4b9e355 MG |
4151 | goto drop; |
4152 | ||
df8a39de | 4153 | if (skb_vlan_tag_present(skb)) { |
2425717b JF |
4154 | if (pt_prev) { |
4155 | ret = deliver_skb(skb, pt_prev, orig_dev); | |
4156 | pt_prev = NULL; | |
4157 | } | |
48cc32d3 | 4158 | if (vlan_do_receive(&skb)) |
2425717b JF |
4159 | goto another_round; |
4160 | else if (unlikely(!skb)) | |
2c17d27c | 4161 | goto out; |
2425717b JF |
4162 | } |
4163 | ||
48cc32d3 | 4164 | rx_handler = rcu_dereference(skb->dev->rx_handler); |
ab95bfe0 JP |
4165 | if (rx_handler) { |
4166 | if (pt_prev) { | |
4167 | ret = deliver_skb(skb, pt_prev, orig_dev); | |
4168 | pt_prev = NULL; | |
4169 | } | |
8a4eb573 JP |
4170 | switch (rx_handler(&skb)) { |
4171 | case RX_HANDLER_CONSUMED: | |
3bc1b1ad | 4172 | ret = NET_RX_SUCCESS; |
2c17d27c | 4173 | goto out; |
8a4eb573 | 4174 | case RX_HANDLER_ANOTHER: |
63d8ea7f | 4175 | goto another_round; |
8a4eb573 JP |
4176 | case RX_HANDLER_EXACT: |
4177 | deliver_exact = true; | |
4178 | case RX_HANDLER_PASS: | |
4179 | break; | |
4180 | default: | |
4181 | BUG(); | |
4182 | } | |
ab95bfe0 | 4183 | } |
1da177e4 | 4184 | |
df8a39de JP |
4185 | if (unlikely(skb_vlan_tag_present(skb))) { |
4186 | if (skb_vlan_tag_get_id(skb)) | |
d4b812de ED |
4187 | skb->pkt_type = PACKET_OTHERHOST; |
4188 | /* Note: we might in the future use prio bits | |
4189 | * and set skb->priority like in vlan_do_receive() | |
4190 | * For the time being, just ignore Priority Code Point | |
4191 | */ | |
4192 | skb->vlan_tci = 0; | |
4193 | } | |
48cc32d3 | 4194 | |
7866a621 SN |
4195 | type = skb->protocol; |
4196 | ||
63d8ea7f | 4197 | /* deliver only exact match when indicated */ |
7866a621 SN |
4198 | if (likely(!deliver_exact)) { |
4199 | deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type, | |
4200 | &ptype_base[ntohs(type) & | |
4201 | PTYPE_HASH_MASK]); | |
4202 | } | |
1f3c8804 | 4203 | |
7866a621 SN |
4204 | deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type, |
4205 | &orig_dev->ptype_specific); | |
4206 | ||
4207 | if (unlikely(skb->dev != orig_dev)) { | |
4208 | deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type, | |
4209 | &skb->dev->ptype_specific); | |
1da177e4 LT |
4210 | } |
4211 | ||
4212 | if (pt_prev) { | |
1080e512 | 4213 | if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC))) |
0e698bf6 | 4214 | goto drop; |
1080e512 MT |
4215 | else |
4216 | ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev); | |
1da177e4 | 4217 | } else { |
b4b9e355 | 4218 | drop: |
6e7333d3 JW |
4219 | if (!deliver_exact) |
4220 | atomic_long_inc(&skb->dev->rx_dropped); | |
4221 | else | |
4222 | atomic_long_inc(&skb->dev->rx_nohandler); | |
1da177e4 LT |
4223 | kfree_skb(skb); |
4224 | /* Jamal, now you will not able to escape explaining | |
4225 | * me how you were going to use this. :-) | |
4226 | */ | |
4227 | ret = NET_RX_DROP; | |
4228 | } | |
4229 | ||
2c17d27c | 4230 | out: |
9754e293 DM |
4231 | return ret; |
4232 | } | |
4233 | ||
4234 | static int __netif_receive_skb(struct sk_buff *skb) | |
4235 | { | |
4236 | int ret; | |
4237 | ||
4238 | if (sk_memalloc_socks() && skb_pfmemalloc(skb)) { | |
f1083048 | 4239 | unsigned int noreclaim_flag; |
9754e293 DM |
4240 | |
4241 | /* | |
4242 | * PFMEMALLOC skbs are special, they should | |
4243 | * - be delivered to SOCK_MEMALLOC sockets only | |
4244 | * - stay away from userspace | |
4245 | * - have bounded memory usage | |
4246 | * | |
4247 | * Use PF_MEMALLOC as this saves us from propagating the allocation | |
4248 | * context down to all allocation sites. | |
4249 | */ | |
f1083048 | 4250 | noreclaim_flag = memalloc_noreclaim_save(); |
9754e293 | 4251 | ret = __netif_receive_skb_core(skb, true); |
f1083048 | 4252 | memalloc_noreclaim_restore(noreclaim_flag); |
9754e293 DM |
4253 | } else |
4254 | ret = __netif_receive_skb_core(skb, false); | |
4255 | ||
1da177e4 LT |
4256 | return ret; |
4257 | } | |
0a9627f2 | 4258 | |
b5cdae32 DM |
4259 | static struct static_key generic_xdp_needed __read_mostly; |
4260 | ||
4261 | static int generic_xdp_install(struct net_device *dev, struct netdev_xdp *xdp) | |
4262 | { | |
4263 | struct bpf_prog *new = xdp->prog; | |
4264 | int ret = 0; | |
4265 | ||
4266 | switch (xdp->command) { | |
4267 | case XDP_SETUP_PROG: { | |
4268 | struct bpf_prog *old = rtnl_dereference(dev->xdp_prog); | |
4269 | ||
4270 | rcu_assign_pointer(dev->xdp_prog, new); | |
4271 | if (old) | |
4272 | bpf_prog_put(old); | |
4273 | ||
4274 | if (old && !new) { | |
4275 | static_key_slow_dec(&generic_xdp_needed); | |
4276 | } else if (new && !old) { | |
4277 | static_key_slow_inc(&generic_xdp_needed); | |
4278 | dev_disable_lro(dev); | |
4279 | } | |
4280 | break; | |
4281 | } | |
4282 | ||
4283 | case XDP_QUERY_PROG: | |
4284 | xdp->prog_attached = !!rcu_access_pointer(dev->xdp_prog); | |
4285 | break; | |
4286 | ||
4287 | default: | |
4288 | ret = -EINVAL; | |
4289 | break; | |
4290 | } | |
4291 | ||
4292 | return ret; | |
4293 | } | |
4294 | ||
4295 | static u32 netif_receive_generic_xdp(struct sk_buff *skb, | |
4296 | struct bpf_prog *xdp_prog) | |
4297 | { | |
4298 | struct xdp_buff xdp; | |
4299 | u32 act = XDP_DROP; | |
4300 | void *orig_data; | |
4301 | int hlen, off; | |
4302 | u32 mac_len; | |
4303 | ||
4304 | /* Reinjected packets coming from act_mirred or similar should | |
4305 | * not get XDP generic processing. | |
4306 | */ | |
4307 | if (skb_cloned(skb)) | |
4308 | return XDP_PASS; | |
4309 | ||
4310 | if (skb_linearize(skb)) | |
4311 | goto do_drop; | |
4312 | ||
4313 | /* The XDP program wants to see the packet starting at the MAC | |
4314 | * header. | |
4315 | */ | |
4316 | mac_len = skb->data - skb_mac_header(skb); | |
4317 | hlen = skb_headlen(skb) + mac_len; | |
4318 | xdp.data = skb->data - mac_len; | |
4319 | xdp.data_end = xdp.data + hlen; | |
4320 | xdp.data_hard_start = skb->data - skb_headroom(skb); | |
4321 | orig_data = xdp.data; | |
4322 | ||
4323 | act = bpf_prog_run_xdp(xdp_prog, &xdp); | |
4324 | ||
4325 | off = xdp.data - orig_data; | |
4326 | if (off > 0) | |
4327 | __skb_pull(skb, off); | |
4328 | else if (off < 0) | |
4329 | __skb_push(skb, -off); | |
4330 | ||
4331 | switch (act) { | |
4332 | case XDP_TX: | |
4333 | __skb_push(skb, mac_len); | |
4334 | /* fall through */ | |
4335 | case XDP_PASS: | |
4336 | break; | |
4337 | ||
4338 | default: | |
4339 | bpf_warn_invalid_xdp_action(act); | |
4340 | /* fall through */ | |
4341 | case XDP_ABORTED: | |
4342 | trace_xdp_exception(skb->dev, xdp_prog, act); | |
4343 | /* fall through */ | |
4344 | case XDP_DROP: | |
4345 | do_drop: | |
4346 | kfree_skb(skb); | |
4347 | break; | |
4348 | } | |
4349 | ||
4350 | return act; | |
4351 | } | |
4352 | ||
4353 | /* When doing generic XDP we have to bypass the qdisc layer and the | |
4354 | * network taps in order to match in-driver-XDP behavior. | |
4355 | */ | |
4356 | static void generic_xdp_tx(struct sk_buff *skb, struct bpf_prog *xdp_prog) | |
4357 | { | |
4358 | struct net_device *dev = skb->dev; | |
4359 | struct netdev_queue *txq; | |
4360 | bool free_skb = true; | |
4361 | int cpu, rc; | |
4362 | ||
4363 | txq = netdev_pick_tx(dev, skb, NULL); | |
4364 | cpu = smp_processor_id(); | |
4365 | HARD_TX_LOCK(dev, txq, cpu); | |
4366 | if (!netif_xmit_stopped(txq)) { | |
4367 | rc = netdev_start_xmit(skb, dev, txq, 0); | |
4368 | if (dev_xmit_complete(rc)) | |
4369 | free_skb = false; | |
4370 | } | |
4371 | HARD_TX_UNLOCK(dev, txq); | |
4372 | if (free_skb) { | |
4373 | trace_xdp_exception(dev, xdp_prog, XDP_TX); | |
4374 | kfree_skb(skb); | |
4375 | } | |
4376 | } | |
4377 | ||
ae78dbfa | 4378 | static int netif_receive_skb_internal(struct sk_buff *skb) |
0a9627f2 | 4379 | { |
2c17d27c JA |
4380 | int ret; |
4381 | ||
588f0330 | 4382 | net_timestamp_check(netdev_tstamp_prequeue, skb); |
3b098e2d | 4383 | |
c1f19b51 RC |
4384 | if (skb_defer_rx_timestamp(skb)) |
4385 | return NET_RX_SUCCESS; | |
4386 | ||
2c17d27c JA |
4387 | rcu_read_lock(); |
4388 | ||
b5cdae32 DM |
4389 | if (static_key_false(&generic_xdp_needed)) { |
4390 | struct bpf_prog *xdp_prog = rcu_dereference(skb->dev->xdp_prog); | |
4391 | ||
4392 | if (xdp_prog) { | |
4393 | u32 act = netif_receive_generic_xdp(skb, xdp_prog); | |
4394 | ||
4395 | if (act != XDP_PASS) { | |
4396 | rcu_read_unlock(); | |
4397 | if (act == XDP_TX) | |
4398 | generic_xdp_tx(skb, xdp_prog); | |
4399 | return NET_RX_DROP; | |
4400 | } | |
4401 | } | |
4402 | } | |
4403 | ||
df334545 | 4404 | #ifdef CONFIG_RPS |
c5905afb | 4405 | if (static_key_false(&rps_needed)) { |
3b098e2d | 4406 | struct rps_dev_flow voidflow, *rflow = &voidflow; |
2c17d27c | 4407 | int cpu = get_rps_cpu(skb->dev, skb, &rflow); |
0a9627f2 | 4408 | |
3b098e2d ED |
4409 | if (cpu >= 0) { |
4410 | ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail); | |
4411 | rcu_read_unlock(); | |
adc9300e | 4412 | return ret; |
3b098e2d | 4413 | } |
fec5e652 | 4414 | } |
1e94d72f | 4415 | #endif |
2c17d27c JA |
4416 | ret = __netif_receive_skb(skb); |
4417 | rcu_read_unlock(); | |
4418 | return ret; | |
0a9627f2 | 4419 | } |
ae78dbfa BH |
4420 | |
4421 | /** | |
4422 | * netif_receive_skb - process receive buffer from network | |
4423 | * @skb: buffer to process | |
4424 | * | |
4425 | * netif_receive_skb() is the main receive data processing function. | |
4426 | * It always succeeds. The buffer may be dropped during processing | |
4427 | * for congestion control or by the protocol layers. | |
4428 | * | |
4429 | * This function may only be called from softirq context and interrupts | |
4430 | * should be enabled. | |
4431 | * | |
4432 | * Return values (usually ignored): | |
4433 | * NET_RX_SUCCESS: no congestion | |
4434 | * NET_RX_DROP: packet was dropped | |
4435 | */ | |
04eb4489 | 4436 | int netif_receive_skb(struct sk_buff *skb) |
ae78dbfa BH |
4437 | { |
4438 | trace_netif_receive_skb_entry(skb); | |
4439 | ||
4440 | return netif_receive_skb_internal(skb); | |
4441 | } | |
04eb4489 | 4442 | EXPORT_SYMBOL(netif_receive_skb); |
1da177e4 | 4443 | |
41852497 | 4444 | DEFINE_PER_CPU(struct work_struct, flush_works); |
145dd5f9 PA |
4445 | |
4446 | /* Network device is going away, flush any packets still pending */ | |
4447 | static void flush_backlog(struct work_struct *work) | |
6e583ce5 | 4448 | { |
6e583ce5 | 4449 | struct sk_buff *skb, *tmp; |
145dd5f9 PA |
4450 | struct softnet_data *sd; |
4451 | ||
4452 | local_bh_disable(); | |
4453 | sd = this_cpu_ptr(&softnet_data); | |
6e583ce5 | 4454 | |
145dd5f9 | 4455 | local_irq_disable(); |
e36fa2f7 | 4456 | rps_lock(sd); |
6e7676c1 | 4457 | skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) { |
41852497 | 4458 | if (skb->dev->reg_state == NETREG_UNREGISTERING) { |
e36fa2f7 | 4459 | __skb_unlink(skb, &sd->input_pkt_queue); |
6e583ce5 | 4460 | kfree_skb(skb); |
76cc8b13 | 4461 | input_queue_head_incr(sd); |
6e583ce5 | 4462 | } |
6e7676c1 | 4463 | } |
e36fa2f7 | 4464 | rps_unlock(sd); |
145dd5f9 | 4465 | local_irq_enable(); |
6e7676c1 CG |
4466 | |
4467 | skb_queue_walk_safe(&sd->process_queue, skb, tmp) { | |
41852497 | 4468 | if (skb->dev->reg_state == NETREG_UNREGISTERING) { |
6e7676c1 CG |
4469 | __skb_unlink(skb, &sd->process_queue); |
4470 | kfree_skb(skb); | |
76cc8b13 | 4471 | input_queue_head_incr(sd); |
6e7676c1 CG |
4472 | } |
4473 | } | |
145dd5f9 PA |
4474 | local_bh_enable(); |
4475 | } | |
4476 | ||
41852497 | 4477 | static void flush_all_backlogs(void) |
145dd5f9 PA |
4478 | { |
4479 | unsigned int cpu; | |
4480 | ||
4481 | get_online_cpus(); | |
4482 | ||
41852497 ED |
4483 | for_each_online_cpu(cpu) |
4484 | queue_work_on(cpu, system_highpri_wq, | |
4485 | per_cpu_ptr(&flush_works, cpu)); | |
145dd5f9 PA |
4486 | |
4487 | for_each_online_cpu(cpu) | |
41852497 | 4488 | flush_work(per_cpu_ptr(&flush_works, cpu)); |
145dd5f9 PA |
4489 | |
4490 | put_online_cpus(); | |
6e583ce5 SH |
4491 | } |
4492 | ||
d565b0a1 HX |
4493 | static int napi_gro_complete(struct sk_buff *skb) |
4494 | { | |
22061d80 | 4495 | struct packet_offload *ptype; |
d565b0a1 | 4496 | __be16 type = skb->protocol; |
22061d80 | 4497 | struct list_head *head = &offload_base; |
d565b0a1 HX |
4498 | int err = -ENOENT; |
4499 | ||
c3c7c254 ED |
4500 | BUILD_BUG_ON(sizeof(struct napi_gro_cb) > sizeof(skb->cb)); |
4501 | ||
fc59f9a3 HX |
4502 | if (NAPI_GRO_CB(skb)->count == 1) { |
4503 | skb_shinfo(skb)->gso_size = 0; | |
d565b0a1 | 4504 | goto out; |
fc59f9a3 | 4505 | } |
d565b0a1 HX |
4506 | |
4507 | rcu_read_lock(); | |
4508 | list_for_each_entry_rcu(ptype, head, list) { | |
f191a1d1 | 4509 | if (ptype->type != type || !ptype->callbacks.gro_complete) |
d565b0a1 HX |
4510 | continue; |
4511 | ||
299603e8 | 4512 | err = ptype->callbacks.gro_complete(skb, 0); |
d565b0a1 HX |
4513 | break; |
4514 | } | |
4515 | rcu_read_unlock(); | |
4516 | ||
4517 | if (err) { | |
4518 | WARN_ON(&ptype->list == head); | |
4519 | kfree_skb(skb); | |
4520 | return NET_RX_SUCCESS; | |
4521 | } | |
4522 | ||
4523 | out: | |
ae78dbfa | 4524 | return netif_receive_skb_internal(skb); |
d565b0a1 HX |
4525 | } |
4526 | ||
2e71a6f8 ED |
4527 | /* napi->gro_list contains packets ordered by age. |
4528 | * youngest packets at the head of it. | |
4529 | * Complete skbs in reverse order to reduce latencies. | |
4530 | */ | |
4531 | void napi_gro_flush(struct napi_struct *napi, bool flush_old) | |
d565b0a1 | 4532 | { |
2e71a6f8 | 4533 | struct sk_buff *skb, *prev = NULL; |
d565b0a1 | 4534 | |
2e71a6f8 ED |
4535 | /* scan list and build reverse chain */ |
4536 | for (skb = napi->gro_list; skb != NULL; skb = skb->next) { | |
4537 | skb->prev = prev; | |
4538 | prev = skb; | |
4539 | } | |
4540 | ||
4541 | for (skb = prev; skb; skb = prev) { | |
d565b0a1 | 4542 | skb->next = NULL; |
2e71a6f8 ED |
4543 | |
4544 | if (flush_old && NAPI_GRO_CB(skb)->age == jiffies) | |
4545 | return; | |
4546 | ||
4547 | prev = skb->prev; | |
d565b0a1 | 4548 | napi_gro_complete(skb); |
2e71a6f8 | 4549 | napi->gro_count--; |
d565b0a1 HX |
4550 | } |
4551 | ||
4552 | napi->gro_list = NULL; | |
4553 | } | |
86cac58b | 4554 | EXPORT_SYMBOL(napi_gro_flush); |
d565b0a1 | 4555 | |
89c5fa33 ED |
4556 | static void gro_list_prepare(struct napi_struct *napi, struct sk_buff *skb) |
4557 | { | |
4558 | struct sk_buff *p; | |
4559 | unsigned int maclen = skb->dev->hard_header_len; | |
0b4cec8c | 4560 | u32 hash = skb_get_hash_raw(skb); |
89c5fa33 ED |
4561 | |
4562 | for (p = napi->gro_list; p; p = p->next) { | |
4563 | unsigned long diffs; | |
4564 | ||
0b4cec8c TH |
4565 | NAPI_GRO_CB(p)->flush = 0; |
4566 | ||
4567 | if (hash != skb_get_hash_raw(p)) { | |
4568 | NAPI_GRO_CB(p)->same_flow = 0; | |
4569 | continue; | |
4570 | } | |
4571 | ||
89c5fa33 ED |
4572 | diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev; |
4573 | diffs |= p->vlan_tci ^ skb->vlan_tci; | |
ce87fc6c | 4574 | diffs |= skb_metadata_dst_cmp(p, skb); |
89c5fa33 ED |
4575 | if (maclen == ETH_HLEN) |
4576 | diffs |= compare_ether_header(skb_mac_header(p), | |
a50e233c | 4577 | skb_mac_header(skb)); |
89c5fa33 ED |
4578 | else if (!diffs) |
4579 | diffs = memcmp(skb_mac_header(p), | |
a50e233c | 4580 | skb_mac_header(skb), |
89c5fa33 ED |
4581 | maclen); |
4582 | NAPI_GRO_CB(p)->same_flow = !diffs; | |
89c5fa33 ED |
4583 | } |
4584 | } | |
4585 | ||
299603e8 JC |
4586 | static void skb_gro_reset_offset(struct sk_buff *skb) |
4587 | { | |
4588 | const struct skb_shared_info *pinfo = skb_shinfo(skb); | |
4589 | const skb_frag_t *frag0 = &pinfo->frags[0]; | |
4590 | ||
4591 | NAPI_GRO_CB(skb)->data_offset = 0; | |
4592 | NAPI_GRO_CB(skb)->frag0 = NULL; | |
4593 | NAPI_GRO_CB(skb)->frag0_len = 0; | |
4594 | ||
4595 | if (skb_mac_header(skb) == skb_tail_pointer(skb) && | |
4596 | pinfo->nr_frags && | |
4597 | !PageHighMem(skb_frag_page(frag0))) { | |
4598 | NAPI_GRO_CB(skb)->frag0 = skb_frag_address(frag0); | |
7cfd5fd5 ED |
4599 | NAPI_GRO_CB(skb)->frag0_len = min_t(unsigned int, |
4600 | skb_frag_size(frag0), | |
4601 | skb->end - skb->tail); | |
89c5fa33 ED |
4602 | } |
4603 | } | |
4604 | ||
a50e233c ED |
4605 | static void gro_pull_from_frag0(struct sk_buff *skb, int grow) |
4606 | { | |
4607 | struct skb_shared_info *pinfo = skb_shinfo(skb); | |
4608 | ||
4609 | BUG_ON(skb->end - skb->tail < grow); | |
4610 | ||
4611 | memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow); | |
4612 | ||
4613 | skb->data_len -= grow; | |
4614 | skb->tail += grow; | |
4615 | ||
4616 | pinfo->frags[0].page_offset += grow; | |
4617 | skb_frag_size_sub(&pinfo->frags[0], grow); | |
4618 | ||
4619 | if (unlikely(!skb_frag_size(&pinfo->frags[0]))) { | |
4620 | skb_frag_unref(skb, 0); | |
4621 | memmove(pinfo->frags, pinfo->frags + 1, | |
4622 | --pinfo->nr_frags * sizeof(pinfo->frags[0])); | |
4623 | } | |
4624 | } | |
4625 | ||
bb728820 | 4626 | static enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb) |
d565b0a1 HX |
4627 | { |
4628 | struct sk_buff **pp = NULL; | |
22061d80 | 4629 | struct packet_offload *ptype; |
d565b0a1 | 4630 | __be16 type = skb->protocol; |
22061d80 | 4631 | struct list_head *head = &offload_base; |
0da2afd5 | 4632 | int same_flow; |
5b252f0c | 4633 | enum gro_result ret; |
a50e233c | 4634 | int grow; |
d565b0a1 | 4635 | |
b5cdae32 | 4636 | if (netif_elide_gro(skb->dev)) |
d565b0a1 HX |
4637 | goto normal; |
4638 | ||
d61d072e | 4639 | if (skb->csum_bad) |
f17f5c91 HX |
4640 | goto normal; |
4641 | ||
89c5fa33 ED |
4642 | gro_list_prepare(napi, skb); |
4643 | ||
d565b0a1 HX |
4644 | rcu_read_lock(); |
4645 | list_for_each_entry_rcu(ptype, head, list) { | |
f191a1d1 | 4646 | if (ptype->type != type || !ptype->callbacks.gro_receive) |
d565b0a1 HX |
4647 | continue; |
4648 | ||
86911732 | 4649 | skb_set_network_header(skb, skb_gro_offset(skb)); |
efd9450e | 4650 | skb_reset_mac_len(skb); |
d565b0a1 | 4651 | NAPI_GRO_CB(skb)->same_flow = 0; |
d61d072e | 4652 | NAPI_GRO_CB(skb)->flush = skb_is_gso(skb) || skb_has_frag_list(skb); |
5d38a079 | 4653 | NAPI_GRO_CB(skb)->free = 0; |
fac8e0f5 | 4654 | NAPI_GRO_CB(skb)->encap_mark = 0; |
fcd91dd4 | 4655 | NAPI_GRO_CB(skb)->recursion_counter = 0; |
a0ca153f | 4656 | NAPI_GRO_CB(skb)->is_fou = 0; |
1530545e | 4657 | NAPI_GRO_CB(skb)->is_atomic = 1; |
15e2396d | 4658 | NAPI_GRO_CB(skb)->gro_remcsum_start = 0; |
d565b0a1 | 4659 | |
662880f4 TH |
4660 | /* Setup for GRO checksum validation */ |
4661 | switch (skb->ip_summed) { | |
4662 | case CHECKSUM_COMPLETE: | |
4663 | NAPI_GRO_CB(skb)->csum = skb->csum; | |
4664 | NAPI_GRO_CB(skb)->csum_valid = 1; | |
4665 | NAPI_GRO_CB(skb)->csum_cnt = 0; | |
4666 | break; | |
4667 | case CHECKSUM_UNNECESSARY: | |
4668 | NAPI_GRO_CB(skb)->csum_cnt = skb->csum_level + 1; | |
4669 | NAPI_GRO_CB(skb)->csum_valid = 0; | |
4670 | break; | |
4671 | default: | |
4672 | NAPI_GRO_CB(skb)->csum_cnt = 0; | |
4673 | NAPI_GRO_CB(skb)->csum_valid = 0; | |
4674 | } | |
d565b0a1 | 4675 | |
f191a1d1 | 4676 | pp = ptype->callbacks.gro_receive(&napi->gro_list, skb); |
d565b0a1 HX |
4677 | break; |
4678 | } | |
4679 | rcu_read_unlock(); | |
4680 | ||
4681 | if (&ptype->list == head) | |
4682 | goto normal; | |
4683 | ||
25393d3f SK |
4684 | if (IS_ERR(pp) && PTR_ERR(pp) == -EINPROGRESS) { |
4685 | ret = GRO_CONSUMED; | |
4686 | goto ok; | |
4687 | } | |
4688 | ||
0da2afd5 | 4689 | same_flow = NAPI_GRO_CB(skb)->same_flow; |
5d0d9be8 | 4690 | ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED; |
0da2afd5 | 4691 | |
d565b0a1 HX |
4692 | if (pp) { |
4693 | struct sk_buff *nskb = *pp; | |
4694 | ||
4695 | *pp = nskb->next; | |
4696 | nskb->next = NULL; | |
4697 | napi_gro_complete(nskb); | |
4ae5544f | 4698 | napi->gro_count--; |
d565b0a1 HX |
4699 | } |
4700 | ||
0da2afd5 | 4701 | if (same_flow) |
d565b0a1 HX |
4702 | goto ok; |
4703 | ||
600adc18 | 4704 | if (NAPI_GRO_CB(skb)->flush) |
d565b0a1 | 4705 | goto normal; |
d565b0a1 | 4706 | |
600adc18 ED |
4707 | if (unlikely(napi->gro_count >= MAX_GRO_SKBS)) { |
4708 | struct sk_buff *nskb = napi->gro_list; | |
4709 | ||
4710 | /* locate the end of the list to select the 'oldest' flow */ | |
4711 | while (nskb->next) { | |
4712 | pp = &nskb->next; | |
4713 | nskb = *pp; | |
4714 | } | |
4715 | *pp = NULL; | |
4716 | nskb->next = NULL; | |
4717 | napi_gro_complete(nskb); | |
4718 | } else { | |
4719 | napi->gro_count++; | |
4720 | } | |
d565b0a1 | 4721 | NAPI_GRO_CB(skb)->count = 1; |
2e71a6f8 | 4722 | NAPI_GRO_CB(skb)->age = jiffies; |
29e98242 | 4723 | NAPI_GRO_CB(skb)->last = skb; |
86911732 | 4724 | skb_shinfo(skb)->gso_size = skb_gro_len(skb); |
d565b0a1 HX |
4725 | skb->next = napi->gro_list; |
4726 | napi->gro_list = skb; | |
5d0d9be8 | 4727 | ret = GRO_HELD; |
d565b0a1 | 4728 | |
ad0f9904 | 4729 | pull: |
a50e233c ED |
4730 | grow = skb_gro_offset(skb) - skb_headlen(skb); |
4731 | if (grow > 0) | |
4732 | gro_pull_from_frag0(skb, grow); | |
d565b0a1 | 4733 | ok: |
5d0d9be8 | 4734 | return ret; |
d565b0a1 HX |
4735 | |
4736 | normal: | |
ad0f9904 HX |
4737 | ret = GRO_NORMAL; |
4738 | goto pull; | |
5d38a079 | 4739 | } |
96e93eab | 4740 | |
bf5a755f JC |
4741 | struct packet_offload *gro_find_receive_by_type(__be16 type) |
4742 | { | |
4743 | struct list_head *offload_head = &offload_base; | |
4744 | struct packet_offload *ptype; | |
4745 | ||
4746 | list_for_each_entry_rcu(ptype, offload_head, list) { | |
4747 | if (ptype->type != type || !ptype->callbacks.gro_receive) | |
4748 | continue; | |
4749 | return ptype; | |
4750 | } | |
4751 | return NULL; | |
4752 | } | |
e27a2f83 | 4753 | EXPORT_SYMBOL(gro_find_receive_by_type); |
bf5a755f JC |
4754 | |
4755 | struct packet_offload *gro_find_complete_by_type(__be16 type) | |
4756 | { | |
4757 | struct list_head *offload_head = &offload_base; | |
4758 | struct packet_offload *ptype; | |
4759 | ||
4760 | list_for_each_entry_rcu(ptype, offload_head, list) { | |
4761 | if (ptype->type != type || !ptype->callbacks.gro_complete) | |
4762 | continue; | |
4763 | return ptype; | |
4764 | } | |
4765 | return NULL; | |
4766 | } | |
e27a2f83 | 4767 | EXPORT_SYMBOL(gro_find_complete_by_type); |
5d38a079 | 4768 | |
bb728820 | 4769 | static gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb) |
5d38a079 | 4770 | { |
5d0d9be8 HX |
4771 | switch (ret) { |
4772 | case GRO_NORMAL: | |
ae78dbfa | 4773 | if (netif_receive_skb_internal(skb)) |
c7c4b3b6 BH |
4774 | ret = GRO_DROP; |
4775 | break; | |
5d38a079 | 4776 | |
5d0d9be8 | 4777 | case GRO_DROP: |
5d38a079 HX |
4778 | kfree_skb(skb); |
4779 | break; | |
5b252f0c | 4780 | |
daa86548 | 4781 | case GRO_MERGED_FREE: |
ce87fc6c JG |
4782 | if (NAPI_GRO_CB(skb)->free == NAPI_GRO_FREE_STOLEN_HEAD) { |
4783 | skb_dst_drop(skb); | |
f991bb9d | 4784 | secpath_reset(skb); |
d7e8883c | 4785 | kmem_cache_free(skbuff_head_cache, skb); |
ce87fc6c | 4786 | } else { |
d7e8883c | 4787 | __kfree_skb(skb); |
ce87fc6c | 4788 | } |
daa86548 ED |
4789 | break; |
4790 | ||
5b252f0c BH |
4791 | case GRO_HELD: |
4792 | case GRO_MERGED: | |
25393d3f | 4793 | case GRO_CONSUMED: |
5b252f0c | 4794 | break; |
5d38a079 HX |
4795 | } |
4796 | ||
c7c4b3b6 | 4797 | return ret; |
5d0d9be8 | 4798 | } |
5d0d9be8 | 4799 | |
c7c4b3b6 | 4800 | gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb) |
5d0d9be8 | 4801 | { |
93f93a44 | 4802 | skb_mark_napi_id(skb, napi); |
ae78dbfa | 4803 | trace_napi_gro_receive_entry(skb); |
86911732 | 4804 | |
a50e233c ED |
4805 | skb_gro_reset_offset(skb); |
4806 | ||
89c5fa33 | 4807 | return napi_skb_finish(dev_gro_receive(napi, skb), skb); |
d565b0a1 HX |
4808 | } |
4809 | EXPORT_SYMBOL(napi_gro_receive); | |
4810 | ||
d0c2b0d2 | 4811 | static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb) |
96e93eab | 4812 | { |
93a35f59 ED |
4813 | if (unlikely(skb->pfmemalloc)) { |
4814 | consume_skb(skb); | |
4815 | return; | |
4816 | } | |
96e93eab | 4817 | __skb_pull(skb, skb_headlen(skb)); |
2a2a459e ED |
4818 | /* restore the reserve we had after netdev_alloc_skb_ip_align() */ |
4819 | skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN - skb_headroom(skb)); | |
3701e513 | 4820 | skb->vlan_tci = 0; |
66c46d74 | 4821 | skb->dev = napi->dev; |
6d152e23 | 4822 | skb->skb_iif = 0; |
c3caf119 JC |
4823 | skb->encapsulation = 0; |
4824 | skb_shinfo(skb)->gso_type = 0; | |
e33d0ba8 | 4825 | skb->truesize = SKB_TRUESIZE(skb_end_offset(skb)); |
f991bb9d | 4826 | secpath_reset(skb); |
96e93eab HX |
4827 | |
4828 | napi->skb = skb; | |
4829 | } | |
96e93eab | 4830 | |
76620aaf | 4831 | struct sk_buff *napi_get_frags(struct napi_struct *napi) |
5d38a079 | 4832 | { |
5d38a079 | 4833 | struct sk_buff *skb = napi->skb; |
5d38a079 HX |
4834 | |
4835 | if (!skb) { | |
fd11a83d | 4836 | skb = napi_alloc_skb(napi, GRO_MAX_HEAD); |
e2f9dc3b ED |
4837 | if (skb) { |
4838 | napi->skb = skb; | |
4839 | skb_mark_napi_id(skb, napi); | |
4840 | } | |
80595d59 | 4841 | } |
96e93eab HX |
4842 | return skb; |
4843 | } | |
76620aaf | 4844 | EXPORT_SYMBOL(napi_get_frags); |
96e93eab | 4845 | |
a50e233c ED |
4846 | static gro_result_t napi_frags_finish(struct napi_struct *napi, |
4847 | struct sk_buff *skb, | |
4848 | gro_result_t ret) | |
96e93eab | 4849 | { |
5d0d9be8 HX |
4850 | switch (ret) { |
4851 | case GRO_NORMAL: | |
a50e233c ED |
4852 | case GRO_HELD: |
4853 | __skb_push(skb, ETH_HLEN); | |
4854 | skb->protocol = eth_type_trans(skb, skb->dev); | |
4855 | if (ret == GRO_NORMAL && netif_receive_skb_internal(skb)) | |
c7c4b3b6 | 4856 | ret = GRO_DROP; |
86911732 | 4857 | break; |
5d38a079 | 4858 | |
5d0d9be8 | 4859 | case GRO_DROP: |
5d0d9be8 HX |
4860 | case GRO_MERGED_FREE: |
4861 | napi_reuse_skb(napi, skb); | |
4862 | break; | |
5b252f0c BH |
4863 | |
4864 | case GRO_MERGED: | |
25393d3f | 4865 | case GRO_CONSUMED: |
5b252f0c | 4866 | break; |
5d0d9be8 | 4867 | } |
5d38a079 | 4868 | |
c7c4b3b6 | 4869 | return ret; |
5d38a079 | 4870 | } |
5d0d9be8 | 4871 | |
a50e233c ED |
4872 | /* Upper GRO stack assumes network header starts at gro_offset=0 |
4873 | * Drivers could call both napi_gro_frags() and napi_gro_receive() | |
4874 | * We copy ethernet header into skb->data to have a common layout. | |
4875 | */ | |
4adb9c4a | 4876 | static struct sk_buff *napi_frags_skb(struct napi_struct *napi) |
76620aaf HX |
4877 | { |
4878 | struct sk_buff *skb = napi->skb; | |
a50e233c ED |
4879 | const struct ethhdr *eth; |
4880 | unsigned int hlen = sizeof(*eth); | |
76620aaf HX |
4881 | |
4882 | napi->skb = NULL; | |
4883 | ||
a50e233c ED |
4884 | skb_reset_mac_header(skb); |
4885 | skb_gro_reset_offset(skb); | |
4886 | ||
4887 | eth = skb_gro_header_fast(skb, 0); | |
4888 | if (unlikely(skb_gro_header_hard(skb, hlen))) { | |
4889 | eth = skb_gro_header_slow(skb, hlen, 0); | |
4890 | if (unlikely(!eth)) { | |
4da46ceb AC |
4891 | net_warn_ratelimited("%s: dropping impossible skb from %s\n", |
4892 | __func__, napi->dev->name); | |
a50e233c ED |
4893 | napi_reuse_skb(napi, skb); |
4894 | return NULL; | |
4895 | } | |
4896 | } else { | |
4897 | gro_pull_from_frag0(skb, hlen); | |
4898 | NAPI_GRO_CB(skb)->frag0 += hlen; | |
4899 | NAPI_GRO_CB(skb)->frag0_len -= hlen; | |
76620aaf | 4900 | } |
a50e233c ED |
4901 | __skb_pull(skb, hlen); |
4902 | ||
4903 | /* | |
4904 | * This works because the only protocols we care about don't require | |
4905 | * special handling. | |
4906 | * We'll fix it up properly in napi_frags_finish() | |
4907 | */ | |
4908 | skb->protocol = eth->h_proto; | |
76620aaf | 4909 | |
76620aaf HX |
4910 | return skb; |
4911 | } | |
76620aaf | 4912 | |
c7c4b3b6 | 4913 | gro_result_t napi_gro_frags(struct napi_struct *napi) |
5d0d9be8 | 4914 | { |
76620aaf | 4915 | struct sk_buff *skb = napi_frags_skb(napi); |
5d0d9be8 HX |
4916 | |
4917 | if (!skb) | |
c7c4b3b6 | 4918 | return GRO_DROP; |
5d0d9be8 | 4919 | |
ae78dbfa BH |
4920 | trace_napi_gro_frags_entry(skb); |
4921 | ||
89c5fa33 | 4922 | return napi_frags_finish(napi, skb, dev_gro_receive(napi, skb)); |
5d0d9be8 | 4923 | } |
5d38a079 HX |
4924 | EXPORT_SYMBOL(napi_gro_frags); |
4925 | ||
573e8fca TH |
4926 | /* Compute the checksum from gro_offset and return the folded value |
4927 | * after adding in any pseudo checksum. | |
4928 | */ | |
4929 | __sum16 __skb_gro_checksum_complete(struct sk_buff *skb) | |
4930 | { | |
4931 | __wsum wsum; | |
4932 | __sum16 sum; | |
4933 | ||
4934 | wsum = skb_checksum(skb, skb_gro_offset(skb), skb_gro_len(skb), 0); | |
4935 | ||
4936 | /* NAPI_GRO_CB(skb)->csum holds pseudo checksum */ | |
4937 | sum = csum_fold(csum_add(NAPI_GRO_CB(skb)->csum, wsum)); | |
4938 | if (likely(!sum)) { | |
4939 | if (unlikely(skb->ip_summed == CHECKSUM_COMPLETE) && | |
4940 | !skb->csum_complete_sw) | |
4941 | netdev_rx_csum_fault(skb->dev); | |
4942 | } | |
4943 | ||
4944 | NAPI_GRO_CB(skb)->csum = wsum; | |
4945 | NAPI_GRO_CB(skb)->csum_valid = 1; | |
4946 | ||
4947 | return sum; | |
4948 | } | |
4949 | EXPORT_SYMBOL(__skb_gro_checksum_complete); | |
4950 | ||
e326bed2 | 4951 | /* |
855abcf0 | 4952 | * net_rps_action_and_irq_enable sends any pending IPI's for rps. |
e326bed2 ED |
4953 | * Note: called with local irq disabled, but exits with local irq enabled. |
4954 | */ | |
4955 | static void net_rps_action_and_irq_enable(struct softnet_data *sd) | |
4956 | { | |
4957 | #ifdef CONFIG_RPS | |
4958 | struct softnet_data *remsd = sd->rps_ipi_list; | |
4959 | ||
4960 | if (remsd) { | |
4961 | sd->rps_ipi_list = NULL; | |
4962 | ||
4963 | local_irq_enable(); | |
4964 | ||
4965 | /* Send pending IPI's to kick RPS processing on remote cpus. */ | |
4966 | while (remsd) { | |
4967 | struct softnet_data *next = remsd->rps_ipi_next; | |
4968 | ||
4969 | if (cpu_online(remsd->cpu)) | |
c46fff2a | 4970 | smp_call_function_single_async(remsd->cpu, |
fce8ad15 | 4971 | &remsd->csd); |
e326bed2 ED |
4972 | remsd = next; |
4973 | } | |
4974 | } else | |
4975 | #endif | |
4976 | local_irq_enable(); | |
4977 | } | |
4978 | ||
d75b1ade ED |
4979 | static bool sd_has_rps_ipi_waiting(struct softnet_data *sd) |
4980 | { | |
4981 | #ifdef CONFIG_RPS | |
4982 | return sd->rps_ipi_list != NULL; | |
4983 | #else | |
4984 | return false; | |
4985 | #endif | |
4986 | } | |
4987 | ||
bea3348e | 4988 | static int process_backlog(struct napi_struct *napi, int quota) |
1da177e4 | 4989 | { |
eecfd7c4 | 4990 | struct softnet_data *sd = container_of(napi, struct softnet_data, backlog); |
145dd5f9 PA |
4991 | bool again = true; |
4992 | int work = 0; | |
1da177e4 | 4993 | |
e326bed2 ED |
4994 | /* Check if we have pending ipi, its better to send them now, |
4995 | * not waiting net_rx_action() end. | |
4996 | */ | |
d75b1ade | 4997 | if (sd_has_rps_ipi_waiting(sd)) { |
e326bed2 ED |
4998 | local_irq_disable(); |
4999 | net_rps_action_and_irq_enable(sd); | |
5000 | } | |
d75b1ade | 5001 | |
3d48b53f | 5002 | napi->weight = dev_rx_weight; |
145dd5f9 | 5003 | while (again) { |
1da177e4 | 5004 | struct sk_buff *skb; |
6e7676c1 CG |
5005 | |
5006 | while ((skb = __skb_dequeue(&sd->process_queue))) { | |
2c17d27c | 5007 | rcu_read_lock(); |
6e7676c1 | 5008 | __netif_receive_skb(skb); |
2c17d27c | 5009 | rcu_read_unlock(); |
76cc8b13 | 5010 | input_queue_head_incr(sd); |
145dd5f9 | 5011 | if (++work >= quota) |
76cc8b13 | 5012 | return work; |
145dd5f9 | 5013 | |
6e7676c1 | 5014 | } |
1da177e4 | 5015 | |
145dd5f9 | 5016 | local_irq_disable(); |
e36fa2f7 | 5017 | rps_lock(sd); |
11ef7a89 | 5018 | if (skb_queue_empty(&sd->input_pkt_queue)) { |
eecfd7c4 ED |
5019 | /* |
5020 | * Inline a custom version of __napi_complete(). | |
5021 | * only current cpu owns and manipulates this napi, | |
11ef7a89 TH |
5022 | * and NAPI_STATE_SCHED is the only possible flag set |
5023 | * on backlog. | |
5024 | * We can use a plain write instead of clear_bit(), | |
eecfd7c4 ED |
5025 | * and we dont need an smp_mb() memory barrier. |
5026 | */ | |
eecfd7c4 | 5027 | napi->state = 0; |
145dd5f9 PA |
5028 | again = false; |
5029 | } else { | |
5030 | skb_queue_splice_tail_init(&sd->input_pkt_queue, | |
5031 | &sd->process_queue); | |
bea3348e | 5032 | } |
e36fa2f7 | 5033 | rps_unlock(sd); |
145dd5f9 | 5034 | local_irq_enable(); |
6e7676c1 | 5035 | } |
1da177e4 | 5036 | |
bea3348e SH |
5037 | return work; |
5038 | } | |
1da177e4 | 5039 | |
bea3348e SH |
5040 | /** |
5041 | * __napi_schedule - schedule for receive | |
c4ea43c5 | 5042 | * @n: entry to schedule |
bea3348e | 5043 | * |
bc9ad166 ED |
5044 | * The entry's receive function will be scheduled to run. |
5045 | * Consider using __napi_schedule_irqoff() if hard irqs are masked. | |
bea3348e | 5046 | */ |
b5606c2d | 5047 | void __napi_schedule(struct napi_struct *n) |
bea3348e SH |
5048 | { |
5049 | unsigned long flags; | |
1da177e4 | 5050 | |
bea3348e | 5051 | local_irq_save(flags); |
903ceff7 | 5052 | ____napi_schedule(this_cpu_ptr(&softnet_data), n); |
bea3348e | 5053 | local_irq_restore(flags); |
1da177e4 | 5054 | } |
bea3348e SH |
5055 | EXPORT_SYMBOL(__napi_schedule); |
5056 | ||
39e6c820 ED |
5057 | /** |
5058 | * napi_schedule_prep - check if napi can be scheduled | |
5059 | * @n: napi context | |
5060 | * | |
5061 | * Test if NAPI routine is already running, and if not mark | |
5062 | * it as running. This is used as a condition variable | |
5063 | * insure only one NAPI poll instance runs. We also make | |
5064 | * sure there is no pending NAPI disable. | |
5065 | */ | |
5066 | bool napi_schedule_prep(struct napi_struct *n) | |
5067 | { | |
5068 | unsigned long val, new; | |
5069 | ||
5070 | do { | |
5071 | val = READ_ONCE(n->state); | |
5072 | if (unlikely(val & NAPIF_STATE_DISABLE)) | |
5073 | return false; | |
5074 | new = val | NAPIF_STATE_SCHED; | |
5075 | ||
5076 | /* Sets STATE_MISSED bit if STATE_SCHED was already set | |
5077 | * This was suggested by Alexander Duyck, as compiler | |
5078 | * emits better code than : | |
5079 | * if (val & NAPIF_STATE_SCHED) | |
5080 | * new |= NAPIF_STATE_MISSED; | |
5081 | */ | |
5082 | new |= (val & NAPIF_STATE_SCHED) / NAPIF_STATE_SCHED * | |
5083 | NAPIF_STATE_MISSED; | |
5084 | } while (cmpxchg(&n->state, val, new) != val); | |
5085 | ||
5086 | return !(val & NAPIF_STATE_SCHED); | |
5087 | } | |
5088 | EXPORT_SYMBOL(napi_schedule_prep); | |
5089 | ||
bc9ad166 ED |
5090 | /** |
5091 | * __napi_schedule_irqoff - schedule for receive | |
5092 | * @n: entry to schedule | |
5093 | * | |
5094 | * Variant of __napi_schedule() assuming hard irqs are masked | |
5095 | */ | |
5096 | void __napi_schedule_irqoff(struct napi_struct *n) | |
5097 | { | |
5098 | ____napi_schedule(this_cpu_ptr(&softnet_data), n); | |
5099 | } | |
5100 | EXPORT_SYMBOL(__napi_schedule_irqoff); | |
5101 | ||
364b6055 | 5102 | bool napi_complete_done(struct napi_struct *n, int work_done) |
d565b0a1 | 5103 | { |
39e6c820 | 5104 | unsigned long flags, val, new; |
d565b0a1 HX |
5105 | |
5106 | /* | |
217f6974 ED |
5107 | * 1) Don't let napi dequeue from the cpu poll list |
5108 | * just in case its running on a different cpu. | |
5109 | * 2) If we are busy polling, do nothing here, we have | |
5110 | * the guarantee we will be called later. | |
d565b0a1 | 5111 | */ |
217f6974 ED |
5112 | if (unlikely(n->state & (NAPIF_STATE_NPSVC | |
5113 | NAPIF_STATE_IN_BUSY_POLL))) | |
364b6055 | 5114 | return false; |
d565b0a1 | 5115 | |
3b47d303 ED |
5116 | if (n->gro_list) { |
5117 | unsigned long timeout = 0; | |
d75b1ade | 5118 | |
3b47d303 ED |
5119 | if (work_done) |
5120 | timeout = n->dev->gro_flush_timeout; | |
5121 | ||
5122 | if (timeout) | |
5123 | hrtimer_start(&n->timer, ns_to_ktime(timeout), | |
5124 | HRTIMER_MODE_REL_PINNED); | |
5125 | else | |
5126 | napi_gro_flush(n, false); | |
5127 | } | |
02c1602e | 5128 | if (unlikely(!list_empty(&n->poll_list))) { |
d75b1ade ED |
5129 | /* If n->poll_list is not empty, we need to mask irqs */ |
5130 | local_irq_save(flags); | |
02c1602e | 5131 | list_del_init(&n->poll_list); |
d75b1ade ED |
5132 | local_irq_restore(flags); |
5133 | } | |
39e6c820 ED |
5134 | |
5135 | do { | |
5136 | val = READ_ONCE(n->state); | |
5137 | ||
5138 | WARN_ON_ONCE(!(val & NAPIF_STATE_SCHED)); | |
5139 | ||
5140 | new = val & ~(NAPIF_STATE_MISSED | NAPIF_STATE_SCHED); | |
5141 | ||
5142 | /* If STATE_MISSED was set, leave STATE_SCHED set, | |
5143 | * because we will call napi->poll() one more time. | |
5144 | * This C code was suggested by Alexander Duyck to help gcc. | |
5145 | */ | |
5146 | new |= (val & NAPIF_STATE_MISSED) / NAPIF_STATE_MISSED * | |
5147 | NAPIF_STATE_SCHED; | |
5148 | } while (cmpxchg(&n->state, val, new) != val); | |
5149 | ||
5150 | if (unlikely(val & NAPIF_STATE_MISSED)) { | |
5151 | __napi_schedule(n); | |
5152 | return false; | |
5153 | } | |
5154 | ||
364b6055 | 5155 | return true; |
d565b0a1 | 5156 | } |
3b47d303 | 5157 | EXPORT_SYMBOL(napi_complete_done); |
d565b0a1 | 5158 | |
af12fa6e | 5159 | /* must be called under rcu_read_lock(), as we dont take a reference */ |
02d62e86 | 5160 | static struct napi_struct *napi_by_id(unsigned int napi_id) |
af12fa6e ET |
5161 | { |
5162 | unsigned int hash = napi_id % HASH_SIZE(napi_hash); | |
5163 | struct napi_struct *napi; | |
5164 | ||
5165 | hlist_for_each_entry_rcu(napi, &napi_hash[hash], napi_hash_node) | |
5166 | if (napi->napi_id == napi_id) | |
5167 | return napi; | |
5168 | ||
5169 | return NULL; | |
5170 | } | |
02d62e86 ED |
5171 | |
5172 | #if defined(CONFIG_NET_RX_BUSY_POLL) | |
217f6974 | 5173 | |
ce6aea93 | 5174 | #define BUSY_POLL_BUDGET 8 |
217f6974 ED |
5175 | |
5176 | static void busy_poll_stop(struct napi_struct *napi, void *have_poll_lock) | |
5177 | { | |
5178 | int rc; | |
5179 | ||
39e6c820 ED |
5180 | /* Busy polling means there is a high chance device driver hard irq |
5181 | * could not grab NAPI_STATE_SCHED, and that NAPI_STATE_MISSED was | |
5182 | * set in napi_schedule_prep(). | |
5183 | * Since we are about to call napi->poll() once more, we can safely | |
5184 | * clear NAPI_STATE_MISSED. | |
5185 | * | |
5186 | * Note: x86 could use a single "lock and ..." instruction | |
5187 | * to perform these two clear_bit() | |
5188 | */ | |
5189 | clear_bit(NAPI_STATE_MISSED, &napi->state); | |
217f6974 ED |
5190 | clear_bit(NAPI_STATE_IN_BUSY_POLL, &napi->state); |
5191 | ||
5192 | local_bh_disable(); | |
5193 | ||
5194 | /* All we really want here is to re-enable device interrupts. | |
5195 | * Ideally, a new ndo_busy_poll_stop() could avoid another round. | |
5196 | */ | |
5197 | rc = napi->poll(napi, BUSY_POLL_BUDGET); | |
5198 | netpoll_poll_unlock(have_poll_lock); | |
5199 | if (rc == BUSY_POLL_BUDGET) | |
5200 | __napi_schedule(napi); | |
5201 | local_bh_enable(); | |
5202 | if (local_softirq_pending()) | |
5203 | do_softirq(); | |
5204 | } | |
5205 | ||
7db6b048 SS |
5206 | void napi_busy_loop(unsigned int napi_id, |
5207 | bool (*loop_end)(void *, unsigned long), | |
5208 | void *loop_end_arg) | |
02d62e86 | 5209 | { |
7db6b048 | 5210 | unsigned long start_time = loop_end ? busy_loop_current_time() : 0; |
217f6974 | 5211 | int (*napi_poll)(struct napi_struct *napi, int budget); |
217f6974 | 5212 | void *have_poll_lock = NULL; |
02d62e86 | 5213 | struct napi_struct *napi; |
217f6974 ED |
5214 | |
5215 | restart: | |
217f6974 | 5216 | napi_poll = NULL; |
02d62e86 | 5217 | |
2a028ecb | 5218 | rcu_read_lock(); |
02d62e86 | 5219 | |
545cd5e5 | 5220 | napi = napi_by_id(napi_id); |
02d62e86 ED |
5221 | if (!napi) |
5222 | goto out; | |
5223 | ||
217f6974 ED |
5224 | preempt_disable(); |
5225 | for (;;) { | |
2b5cd0df AD |
5226 | int work = 0; |
5227 | ||
2a028ecb | 5228 | local_bh_disable(); |
217f6974 ED |
5229 | if (!napi_poll) { |
5230 | unsigned long val = READ_ONCE(napi->state); | |
5231 | ||
5232 | /* If multiple threads are competing for this napi, | |
5233 | * we avoid dirtying napi->state as much as we can. | |
5234 | */ | |
5235 | if (val & (NAPIF_STATE_DISABLE | NAPIF_STATE_SCHED | | |
5236 | NAPIF_STATE_IN_BUSY_POLL)) | |
5237 | goto count; | |
5238 | if (cmpxchg(&napi->state, val, | |
5239 | val | NAPIF_STATE_IN_BUSY_POLL | | |
5240 | NAPIF_STATE_SCHED) != val) | |
5241 | goto count; | |
5242 | have_poll_lock = netpoll_poll_lock(napi); | |
5243 | napi_poll = napi->poll; | |
5244 | } | |
2b5cd0df AD |
5245 | work = napi_poll(napi, BUSY_POLL_BUDGET); |
5246 | trace_napi_poll(napi, work, BUSY_POLL_BUDGET); | |
217f6974 | 5247 | count: |
2b5cd0df | 5248 | if (work > 0) |
7db6b048 | 5249 | __NET_ADD_STATS(dev_net(napi->dev), |
2b5cd0df | 5250 | LINUX_MIB_BUSYPOLLRXPACKETS, work); |
2a028ecb | 5251 | local_bh_enable(); |
02d62e86 | 5252 | |
7db6b048 | 5253 | if (!loop_end || loop_end(loop_end_arg, start_time)) |
217f6974 | 5254 | break; |
02d62e86 | 5255 | |
217f6974 ED |
5256 | if (unlikely(need_resched())) { |
5257 | if (napi_poll) | |
5258 | busy_poll_stop(napi, have_poll_lock); | |
5259 | preempt_enable(); | |
5260 | rcu_read_unlock(); | |
5261 | cond_resched(); | |
7db6b048 | 5262 | if (loop_end(loop_end_arg, start_time)) |
2b5cd0df | 5263 | return; |
217f6974 ED |
5264 | goto restart; |
5265 | } | |
6cdf89b1 | 5266 | cpu_relax(); |
217f6974 ED |
5267 | } |
5268 | if (napi_poll) | |
5269 | busy_poll_stop(napi, have_poll_lock); | |
5270 | preempt_enable(); | |
02d62e86 | 5271 | out: |
2a028ecb | 5272 | rcu_read_unlock(); |
02d62e86 | 5273 | } |
7db6b048 | 5274 | EXPORT_SYMBOL(napi_busy_loop); |
02d62e86 ED |
5275 | |
5276 | #endif /* CONFIG_NET_RX_BUSY_POLL */ | |
af12fa6e | 5277 | |
149d6ad8 | 5278 | static void napi_hash_add(struct napi_struct *napi) |
af12fa6e | 5279 | { |
d64b5e85 ED |
5280 | if (test_bit(NAPI_STATE_NO_BUSY_POLL, &napi->state) || |
5281 | test_and_set_bit(NAPI_STATE_HASHED, &napi->state)) | |
52bd2d62 | 5282 | return; |
af12fa6e | 5283 | |
52bd2d62 | 5284 | spin_lock(&napi_hash_lock); |
af12fa6e | 5285 | |
545cd5e5 | 5286 | /* 0..NR_CPUS range is reserved for sender_cpu use */ |
52bd2d62 | 5287 | do { |
545cd5e5 AD |
5288 | if (unlikely(++napi_gen_id < MIN_NAPI_ID)) |
5289 | napi_gen_id = MIN_NAPI_ID; | |
52bd2d62 ED |
5290 | } while (napi_by_id(napi_gen_id)); |
5291 | napi->napi_id = napi_gen_id; | |
af12fa6e | 5292 | |
52bd2d62 ED |
5293 | hlist_add_head_rcu(&napi->napi_hash_node, |
5294 | &napi_hash[napi->napi_id % HASH_SIZE(napi_hash)]); | |
af12fa6e | 5295 | |
52bd2d62 | 5296 | spin_unlock(&napi_hash_lock); |
af12fa6e | 5297 | } |
af12fa6e ET |
5298 | |
5299 | /* Warning : caller is responsible to make sure rcu grace period | |
5300 | * is respected before freeing memory containing @napi | |
5301 | */ | |
34cbe27e | 5302 | bool napi_hash_del(struct napi_struct *napi) |
af12fa6e | 5303 | { |
34cbe27e ED |
5304 | bool rcu_sync_needed = false; |
5305 | ||
af12fa6e ET |
5306 | spin_lock(&napi_hash_lock); |
5307 | ||
34cbe27e ED |
5308 | if (test_and_clear_bit(NAPI_STATE_HASHED, &napi->state)) { |
5309 | rcu_sync_needed = true; | |
af12fa6e | 5310 | hlist_del_rcu(&napi->napi_hash_node); |
34cbe27e | 5311 | } |
af12fa6e | 5312 | spin_unlock(&napi_hash_lock); |
34cbe27e | 5313 | return rcu_sync_needed; |
af12fa6e ET |
5314 | } |
5315 | EXPORT_SYMBOL_GPL(napi_hash_del); | |
5316 | ||
3b47d303 ED |
5317 | static enum hrtimer_restart napi_watchdog(struct hrtimer *timer) |
5318 | { | |
5319 | struct napi_struct *napi; | |
5320 | ||
5321 | napi = container_of(timer, struct napi_struct, timer); | |
39e6c820 ED |
5322 | |
5323 | /* Note : we use a relaxed variant of napi_schedule_prep() not setting | |
5324 | * NAPI_STATE_MISSED, since we do not react to a device IRQ. | |
5325 | */ | |
5326 | if (napi->gro_list && !napi_disable_pending(napi) && | |
5327 | !test_and_set_bit(NAPI_STATE_SCHED, &napi->state)) | |
5328 | __napi_schedule_irqoff(napi); | |
3b47d303 ED |
5329 | |
5330 | return HRTIMER_NORESTART; | |
5331 | } | |
5332 | ||
d565b0a1 HX |
5333 | void netif_napi_add(struct net_device *dev, struct napi_struct *napi, |
5334 | int (*poll)(struct napi_struct *, int), int weight) | |
5335 | { | |
5336 | INIT_LIST_HEAD(&napi->poll_list); | |
3b47d303 ED |
5337 | hrtimer_init(&napi->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_PINNED); |
5338 | napi->timer.function = napi_watchdog; | |
4ae5544f | 5339 | napi->gro_count = 0; |
d565b0a1 | 5340 | napi->gro_list = NULL; |
5d38a079 | 5341 | napi->skb = NULL; |
d565b0a1 | 5342 | napi->poll = poll; |
82dc3c63 ED |
5343 | if (weight > NAPI_POLL_WEIGHT) |
5344 | pr_err_once("netif_napi_add() called with weight %d on device %s\n", | |
5345 | weight, dev->name); | |
d565b0a1 HX |
5346 | napi->weight = weight; |
5347 | list_add(&napi->dev_list, &dev->napi_list); | |
d565b0a1 | 5348 | napi->dev = dev; |
5d38a079 | 5349 | #ifdef CONFIG_NETPOLL |
d565b0a1 HX |
5350 | napi->poll_owner = -1; |
5351 | #endif | |
5352 | set_bit(NAPI_STATE_SCHED, &napi->state); | |
93d05d4a | 5353 | napi_hash_add(napi); |
d565b0a1 HX |
5354 | } |
5355 | EXPORT_SYMBOL(netif_napi_add); | |
5356 | ||
3b47d303 ED |
5357 | void napi_disable(struct napi_struct *n) |
5358 | { | |
5359 | might_sleep(); | |
5360 | set_bit(NAPI_STATE_DISABLE, &n->state); | |
5361 | ||
5362 | while (test_and_set_bit(NAPI_STATE_SCHED, &n->state)) | |
5363 | msleep(1); | |
2d8bff12 NH |
5364 | while (test_and_set_bit(NAPI_STATE_NPSVC, &n->state)) |
5365 | msleep(1); | |
3b47d303 ED |
5366 | |
5367 | hrtimer_cancel(&n->timer); | |
5368 | ||
5369 | clear_bit(NAPI_STATE_DISABLE, &n->state); | |
5370 | } | |
5371 | EXPORT_SYMBOL(napi_disable); | |
5372 | ||
93d05d4a | 5373 | /* Must be called in process context */ |
d565b0a1 HX |
5374 | void netif_napi_del(struct napi_struct *napi) |
5375 | { | |
93d05d4a ED |
5376 | might_sleep(); |
5377 | if (napi_hash_del(napi)) | |
5378 | synchronize_net(); | |
d7b06636 | 5379 | list_del_init(&napi->dev_list); |
76620aaf | 5380 | napi_free_frags(napi); |
d565b0a1 | 5381 | |
289dccbe | 5382 | kfree_skb_list(napi->gro_list); |
d565b0a1 | 5383 | napi->gro_list = NULL; |
4ae5544f | 5384 | napi->gro_count = 0; |
d565b0a1 HX |
5385 | } |
5386 | EXPORT_SYMBOL(netif_napi_del); | |
5387 | ||
726ce70e HX |
5388 | static int napi_poll(struct napi_struct *n, struct list_head *repoll) |
5389 | { | |
5390 | void *have; | |
5391 | int work, weight; | |
5392 | ||
5393 | list_del_init(&n->poll_list); | |
5394 | ||
5395 | have = netpoll_poll_lock(n); | |
5396 | ||
5397 | weight = n->weight; | |
5398 | ||
5399 | /* This NAPI_STATE_SCHED test is for avoiding a race | |
5400 | * with netpoll's poll_napi(). Only the entity which | |
5401 | * obtains the lock and sees NAPI_STATE_SCHED set will | |
5402 | * actually make the ->poll() call. Therefore we avoid | |
5403 | * accidentally calling ->poll() when NAPI is not scheduled. | |
5404 | */ | |
5405 | work = 0; | |
5406 | if (test_bit(NAPI_STATE_SCHED, &n->state)) { | |
5407 | work = n->poll(n, weight); | |
1db19db7 | 5408 | trace_napi_poll(n, work, weight); |
726ce70e HX |
5409 | } |
5410 | ||
5411 | WARN_ON_ONCE(work > weight); | |
5412 | ||
5413 | if (likely(work < weight)) | |
5414 | goto out_unlock; | |
5415 | ||
5416 | /* Drivers must not modify the NAPI state if they | |
5417 | * consume the entire weight. In such cases this code | |
5418 | * still "owns" the NAPI instance and therefore can | |
5419 | * move the instance around on the list at-will. | |
5420 | */ | |
5421 | if (unlikely(napi_disable_pending(n))) { | |
5422 | napi_complete(n); | |
5423 | goto out_unlock; | |
5424 | } | |
5425 | ||
5426 | if (n->gro_list) { | |
5427 | /* flush too old packets | |
5428 | * If HZ < 1000, flush all packets. | |
5429 | */ | |
5430 | napi_gro_flush(n, HZ >= 1000); | |
5431 | } | |
5432 | ||
001ce546 HX |
5433 | /* Some drivers may have called napi_schedule |
5434 | * prior to exhausting their budget. | |
5435 | */ | |
5436 | if (unlikely(!list_empty(&n->poll_list))) { | |
5437 | pr_warn_once("%s: Budget exhausted after napi rescheduled\n", | |
5438 | n->dev ? n->dev->name : "backlog"); | |
5439 | goto out_unlock; | |
5440 | } | |
5441 | ||
726ce70e HX |
5442 | list_add_tail(&n->poll_list, repoll); |
5443 | ||
5444 | out_unlock: | |
5445 | netpoll_poll_unlock(have); | |
5446 | ||
5447 | return work; | |
5448 | } | |
5449 | ||
0766f788 | 5450 | static __latent_entropy void net_rx_action(struct softirq_action *h) |
1da177e4 | 5451 | { |
903ceff7 | 5452 | struct softnet_data *sd = this_cpu_ptr(&softnet_data); |
7acf8a1e MW |
5453 | unsigned long time_limit = jiffies + |
5454 | usecs_to_jiffies(netdev_budget_usecs); | |
51b0bded | 5455 | int budget = netdev_budget; |
d75b1ade ED |
5456 | LIST_HEAD(list); |
5457 | LIST_HEAD(repoll); | |
53fb95d3 | 5458 | |
1da177e4 | 5459 | local_irq_disable(); |
d75b1ade ED |
5460 | list_splice_init(&sd->poll_list, &list); |
5461 | local_irq_enable(); | |
1da177e4 | 5462 | |
ceb8d5bf | 5463 | for (;;) { |
bea3348e | 5464 | struct napi_struct *n; |
1da177e4 | 5465 | |
ceb8d5bf HX |
5466 | if (list_empty(&list)) { |
5467 | if (!sd_has_rps_ipi_waiting(sd) && list_empty(&repoll)) | |
f52dffe0 | 5468 | goto out; |
ceb8d5bf HX |
5469 | break; |
5470 | } | |
5471 | ||
6bd373eb HX |
5472 | n = list_first_entry(&list, struct napi_struct, poll_list); |
5473 | budget -= napi_poll(n, &repoll); | |
5474 | ||
d75b1ade | 5475 | /* If softirq window is exhausted then punt. |
24f8b238 SH |
5476 | * Allow this to run for 2 jiffies since which will allow |
5477 | * an average latency of 1.5/HZ. | |
bea3348e | 5478 | */ |
ceb8d5bf HX |
5479 | if (unlikely(budget <= 0 || |
5480 | time_after_eq(jiffies, time_limit))) { | |
5481 | sd->time_squeeze++; | |
5482 | break; | |
5483 | } | |
1da177e4 | 5484 | } |
d75b1ade | 5485 | |
d75b1ade ED |
5486 | local_irq_disable(); |
5487 | ||
5488 | list_splice_tail_init(&sd->poll_list, &list); | |
5489 | list_splice_tail(&repoll, &list); | |
5490 | list_splice(&list, &sd->poll_list); | |
5491 | if (!list_empty(&sd->poll_list)) | |
5492 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); | |
5493 | ||
e326bed2 | 5494 | net_rps_action_and_irq_enable(sd); |
f52dffe0 ED |
5495 | out: |
5496 | __kfree_skb_flush(); | |
1da177e4 LT |
5497 | } |
5498 | ||
aa9d8560 | 5499 | struct netdev_adjacent { |
9ff162a8 | 5500 | struct net_device *dev; |
5d261913 VF |
5501 | |
5502 | /* upper master flag, there can only be one master device per list */ | |
9ff162a8 | 5503 | bool master; |
5d261913 | 5504 | |
5d261913 VF |
5505 | /* counter for the number of times this device was added to us */ |
5506 | u16 ref_nr; | |
5507 | ||
402dae96 VF |
5508 | /* private field for the users */ |
5509 | void *private; | |
5510 | ||
9ff162a8 JP |
5511 | struct list_head list; |
5512 | struct rcu_head rcu; | |
9ff162a8 JP |
5513 | }; |
5514 | ||
6ea29da1 | 5515 | static struct netdev_adjacent *__netdev_find_adj(struct net_device *adj_dev, |
2f268f12 | 5516 | struct list_head *adj_list) |
9ff162a8 | 5517 | { |
5d261913 | 5518 | struct netdev_adjacent *adj; |
5d261913 | 5519 | |
2f268f12 | 5520 | list_for_each_entry(adj, adj_list, list) { |
5d261913 VF |
5521 | if (adj->dev == adj_dev) |
5522 | return adj; | |
9ff162a8 JP |
5523 | } |
5524 | return NULL; | |
5525 | } | |
5526 | ||
f1170fd4 DA |
5527 | static int __netdev_has_upper_dev(struct net_device *upper_dev, void *data) |
5528 | { | |
5529 | struct net_device *dev = data; | |
5530 | ||
5531 | return upper_dev == dev; | |
5532 | } | |
5533 | ||
9ff162a8 JP |
5534 | /** |
5535 | * netdev_has_upper_dev - Check if device is linked to an upper device | |
5536 | * @dev: device | |
5537 | * @upper_dev: upper device to check | |
5538 | * | |
5539 | * Find out if a device is linked to specified upper device and return true | |
5540 | * in case it is. Note that this checks only immediate upper device, | |
5541 | * not through a complete stack of devices. The caller must hold the RTNL lock. | |
5542 | */ | |
5543 | bool netdev_has_upper_dev(struct net_device *dev, | |
5544 | struct net_device *upper_dev) | |
5545 | { | |
5546 | ASSERT_RTNL(); | |
5547 | ||
f1170fd4 DA |
5548 | return netdev_walk_all_upper_dev_rcu(dev, __netdev_has_upper_dev, |
5549 | upper_dev); | |
9ff162a8 JP |
5550 | } |
5551 | EXPORT_SYMBOL(netdev_has_upper_dev); | |
5552 | ||
1a3f060c DA |
5553 | /** |
5554 | * netdev_has_upper_dev_all - Check if device is linked to an upper device | |
5555 | * @dev: device | |
5556 | * @upper_dev: upper device to check | |
5557 | * | |
5558 | * Find out if a device is linked to specified upper device and return true | |
5559 | * in case it is. Note that this checks the entire upper device chain. | |
5560 | * The caller must hold rcu lock. | |
5561 | */ | |
5562 | ||
1a3f060c DA |
5563 | bool netdev_has_upper_dev_all_rcu(struct net_device *dev, |
5564 | struct net_device *upper_dev) | |
5565 | { | |
5566 | return !!netdev_walk_all_upper_dev_rcu(dev, __netdev_has_upper_dev, | |
5567 | upper_dev); | |
5568 | } | |
5569 | EXPORT_SYMBOL(netdev_has_upper_dev_all_rcu); | |
5570 | ||
9ff162a8 JP |
5571 | /** |
5572 | * netdev_has_any_upper_dev - Check if device is linked to some device | |
5573 | * @dev: device | |
5574 | * | |
5575 | * Find out if a device is linked to an upper device and return true in case | |
5576 | * it is. The caller must hold the RTNL lock. | |
5577 | */ | |
1d143d9f | 5578 | static bool netdev_has_any_upper_dev(struct net_device *dev) |
9ff162a8 JP |
5579 | { |
5580 | ASSERT_RTNL(); | |
5581 | ||
f1170fd4 | 5582 | return !list_empty(&dev->adj_list.upper); |
9ff162a8 | 5583 | } |
9ff162a8 JP |
5584 | |
5585 | /** | |
5586 | * netdev_master_upper_dev_get - Get master upper device | |
5587 | * @dev: device | |
5588 | * | |
5589 | * Find a master upper device and return pointer to it or NULL in case | |
5590 | * it's not there. The caller must hold the RTNL lock. | |
5591 | */ | |
5592 | struct net_device *netdev_master_upper_dev_get(struct net_device *dev) | |
5593 | { | |
aa9d8560 | 5594 | struct netdev_adjacent *upper; |
9ff162a8 JP |
5595 | |
5596 | ASSERT_RTNL(); | |
5597 | ||
2f268f12 | 5598 | if (list_empty(&dev->adj_list.upper)) |
9ff162a8 JP |
5599 | return NULL; |
5600 | ||
2f268f12 | 5601 | upper = list_first_entry(&dev->adj_list.upper, |
aa9d8560 | 5602 | struct netdev_adjacent, list); |
9ff162a8 JP |
5603 | if (likely(upper->master)) |
5604 | return upper->dev; | |
5605 | return NULL; | |
5606 | } | |
5607 | EXPORT_SYMBOL(netdev_master_upper_dev_get); | |
5608 | ||
0f524a80 DA |
5609 | /** |
5610 | * netdev_has_any_lower_dev - Check if device is linked to some device | |
5611 | * @dev: device | |
5612 | * | |
5613 | * Find out if a device is linked to a lower device and return true in case | |
5614 | * it is. The caller must hold the RTNL lock. | |
5615 | */ | |
5616 | static bool netdev_has_any_lower_dev(struct net_device *dev) | |
5617 | { | |
5618 | ASSERT_RTNL(); | |
5619 | ||
5620 | return !list_empty(&dev->adj_list.lower); | |
5621 | } | |
5622 | ||
b6ccba4c VF |
5623 | void *netdev_adjacent_get_private(struct list_head *adj_list) |
5624 | { | |
5625 | struct netdev_adjacent *adj; | |
5626 | ||
5627 | adj = list_entry(adj_list, struct netdev_adjacent, list); | |
5628 | ||
5629 | return adj->private; | |
5630 | } | |
5631 | EXPORT_SYMBOL(netdev_adjacent_get_private); | |
5632 | ||
44a40855 VY |
5633 | /** |
5634 | * netdev_upper_get_next_dev_rcu - Get the next dev from upper list | |
5635 | * @dev: device | |
5636 | * @iter: list_head ** of the current position | |
5637 | * | |
5638 | * Gets the next device from the dev's upper list, starting from iter | |
5639 | * position. The caller must hold RCU read lock. | |
5640 | */ | |
5641 | struct net_device *netdev_upper_get_next_dev_rcu(struct net_device *dev, | |
5642 | struct list_head **iter) | |
5643 | { | |
5644 | struct netdev_adjacent *upper; | |
5645 | ||
5646 | WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held()); | |
5647 | ||
5648 | upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); | |
5649 | ||
5650 | if (&upper->list == &dev->adj_list.upper) | |
5651 | return NULL; | |
5652 | ||
5653 | *iter = &upper->list; | |
5654 | ||
5655 | return upper->dev; | |
5656 | } | |
5657 | EXPORT_SYMBOL(netdev_upper_get_next_dev_rcu); | |
5658 | ||
1a3f060c DA |
5659 | static struct net_device *netdev_next_upper_dev_rcu(struct net_device *dev, |
5660 | struct list_head **iter) | |
5661 | { | |
5662 | struct netdev_adjacent *upper; | |
5663 | ||
5664 | WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held()); | |
5665 | ||
5666 | upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); | |
5667 | ||
5668 | if (&upper->list == &dev->adj_list.upper) | |
5669 | return NULL; | |
5670 | ||
5671 | *iter = &upper->list; | |
5672 | ||
5673 | return upper->dev; | |
5674 | } | |
5675 | ||
5676 | int netdev_walk_all_upper_dev_rcu(struct net_device *dev, | |
5677 | int (*fn)(struct net_device *dev, | |
5678 | void *data), | |
5679 | void *data) | |
5680 | { | |
5681 | struct net_device *udev; | |
5682 | struct list_head *iter; | |
5683 | int ret; | |
5684 | ||
5685 | for (iter = &dev->adj_list.upper, | |
5686 | udev = netdev_next_upper_dev_rcu(dev, &iter); | |
5687 | udev; | |
5688 | udev = netdev_next_upper_dev_rcu(dev, &iter)) { | |
5689 | /* first is the upper device itself */ | |
5690 | ret = fn(udev, data); | |
5691 | if (ret) | |
5692 | return ret; | |
5693 | ||
5694 | /* then look at all of its upper devices */ | |
5695 | ret = netdev_walk_all_upper_dev_rcu(udev, fn, data); | |
5696 | if (ret) | |
5697 | return ret; | |
5698 | } | |
5699 | ||
5700 | return 0; | |
5701 | } | |
5702 | EXPORT_SYMBOL_GPL(netdev_walk_all_upper_dev_rcu); | |
5703 | ||
31088a11 VF |
5704 | /** |
5705 | * netdev_lower_get_next_private - Get the next ->private from the | |
5706 | * lower neighbour list | |
5707 | * @dev: device | |
5708 | * @iter: list_head ** of the current position | |
5709 | * | |
5710 | * Gets the next netdev_adjacent->private from the dev's lower neighbour | |
5711 | * list, starting from iter position. The caller must hold either hold the | |
5712 | * RTNL lock or its own locking that guarantees that the neighbour lower | |
b469139e | 5713 | * list will remain unchanged. |
31088a11 VF |
5714 | */ |
5715 | void *netdev_lower_get_next_private(struct net_device *dev, | |
5716 | struct list_head **iter) | |
5717 | { | |
5718 | struct netdev_adjacent *lower; | |
5719 | ||
5720 | lower = list_entry(*iter, struct netdev_adjacent, list); | |
5721 | ||
5722 | if (&lower->list == &dev->adj_list.lower) | |
5723 | return NULL; | |
5724 | ||
6859e7df | 5725 | *iter = lower->list.next; |
31088a11 VF |
5726 | |
5727 | return lower->private; | |
5728 | } | |
5729 | EXPORT_SYMBOL(netdev_lower_get_next_private); | |
5730 | ||
5731 | /** | |
5732 | * netdev_lower_get_next_private_rcu - Get the next ->private from the | |
5733 | * lower neighbour list, RCU | |
5734 | * variant | |
5735 | * @dev: device | |
5736 | * @iter: list_head ** of the current position | |
5737 | * | |
5738 | * Gets the next netdev_adjacent->private from the dev's lower neighbour | |
5739 | * list, starting from iter position. The caller must hold RCU read lock. | |
5740 | */ | |
5741 | void *netdev_lower_get_next_private_rcu(struct net_device *dev, | |
5742 | struct list_head **iter) | |
5743 | { | |
5744 | struct netdev_adjacent *lower; | |
5745 | ||
5746 | WARN_ON_ONCE(!rcu_read_lock_held()); | |
5747 | ||
5748 | lower = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); | |
5749 | ||
5750 | if (&lower->list == &dev->adj_list.lower) | |
5751 | return NULL; | |
5752 | ||
6859e7df | 5753 | *iter = &lower->list; |
31088a11 VF |
5754 | |
5755 | return lower->private; | |
5756 | } | |
5757 | EXPORT_SYMBOL(netdev_lower_get_next_private_rcu); | |
5758 | ||
4085ebe8 VY |
5759 | /** |
5760 | * netdev_lower_get_next - Get the next device from the lower neighbour | |
5761 | * list | |
5762 | * @dev: device | |
5763 | * @iter: list_head ** of the current position | |
5764 | * | |
5765 | * Gets the next netdev_adjacent from the dev's lower neighbour | |
5766 | * list, starting from iter position. The caller must hold RTNL lock or | |
5767 | * its own locking that guarantees that the neighbour lower | |
b469139e | 5768 | * list will remain unchanged. |
4085ebe8 VY |
5769 | */ |
5770 | void *netdev_lower_get_next(struct net_device *dev, struct list_head **iter) | |
5771 | { | |
5772 | struct netdev_adjacent *lower; | |
5773 | ||
cfdd28be | 5774 | lower = list_entry(*iter, struct netdev_adjacent, list); |
4085ebe8 VY |
5775 | |
5776 | if (&lower->list == &dev->adj_list.lower) | |
5777 | return NULL; | |
5778 | ||
cfdd28be | 5779 | *iter = lower->list.next; |
4085ebe8 VY |
5780 | |
5781 | return lower->dev; | |
5782 | } | |
5783 | EXPORT_SYMBOL(netdev_lower_get_next); | |
5784 | ||
1a3f060c DA |
5785 | static struct net_device *netdev_next_lower_dev(struct net_device *dev, |
5786 | struct list_head **iter) | |
5787 | { | |
5788 | struct netdev_adjacent *lower; | |
5789 | ||
46b5ab1a | 5790 | lower = list_entry((*iter)->next, struct netdev_adjacent, list); |
1a3f060c DA |
5791 | |
5792 | if (&lower->list == &dev->adj_list.lower) | |
5793 | return NULL; | |
5794 | ||
46b5ab1a | 5795 | *iter = &lower->list; |
1a3f060c DA |
5796 | |
5797 | return lower->dev; | |
5798 | } | |
5799 | ||
5800 | int netdev_walk_all_lower_dev(struct net_device *dev, | |
5801 | int (*fn)(struct net_device *dev, | |
5802 | void *data), | |
5803 | void *data) | |
5804 | { | |
5805 | struct net_device *ldev; | |
5806 | struct list_head *iter; | |
5807 | int ret; | |
5808 | ||
5809 | for (iter = &dev->adj_list.lower, | |
5810 | ldev = netdev_next_lower_dev(dev, &iter); | |
5811 | ldev; | |
5812 | ldev = netdev_next_lower_dev(dev, &iter)) { | |
5813 | /* first is the lower device itself */ | |
5814 | ret = fn(ldev, data); | |
5815 | if (ret) | |
5816 | return ret; | |
5817 | ||
5818 | /* then look at all of its lower devices */ | |
5819 | ret = netdev_walk_all_lower_dev(ldev, fn, data); | |
5820 | if (ret) | |
5821 | return ret; | |
5822 | } | |
5823 | ||
5824 | return 0; | |
5825 | } | |
5826 | EXPORT_SYMBOL_GPL(netdev_walk_all_lower_dev); | |
5827 | ||
1a3f060c DA |
5828 | static struct net_device *netdev_next_lower_dev_rcu(struct net_device *dev, |
5829 | struct list_head **iter) | |
5830 | { | |
5831 | struct netdev_adjacent *lower; | |
5832 | ||
5833 | lower = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); | |
5834 | if (&lower->list == &dev->adj_list.lower) | |
5835 | return NULL; | |
5836 | ||
5837 | *iter = &lower->list; | |
5838 | ||
5839 | return lower->dev; | |
5840 | } | |
5841 | ||
5842 | int netdev_walk_all_lower_dev_rcu(struct net_device *dev, | |
5843 | int (*fn)(struct net_device *dev, | |
5844 | void *data), | |
5845 | void *data) | |
5846 | { | |
5847 | struct net_device *ldev; | |
5848 | struct list_head *iter; | |
5849 | int ret; | |
5850 | ||
5851 | for (iter = &dev->adj_list.lower, | |
5852 | ldev = netdev_next_lower_dev_rcu(dev, &iter); | |
5853 | ldev; | |
5854 | ldev = netdev_next_lower_dev_rcu(dev, &iter)) { | |
5855 | /* first is the lower device itself */ | |
5856 | ret = fn(ldev, data); | |
5857 | if (ret) | |
5858 | return ret; | |
5859 | ||
5860 | /* then look at all of its lower devices */ | |
5861 | ret = netdev_walk_all_lower_dev_rcu(ldev, fn, data); | |
5862 | if (ret) | |
5863 | return ret; | |
5864 | } | |
5865 | ||
5866 | return 0; | |
5867 | } | |
5868 | EXPORT_SYMBOL_GPL(netdev_walk_all_lower_dev_rcu); | |
5869 | ||
e001bfad | 5870 | /** |
5871 | * netdev_lower_get_first_private_rcu - Get the first ->private from the | |
5872 | * lower neighbour list, RCU | |
5873 | * variant | |
5874 | * @dev: device | |
5875 | * | |
5876 | * Gets the first netdev_adjacent->private from the dev's lower neighbour | |
5877 | * list. The caller must hold RCU read lock. | |
5878 | */ | |
5879 | void *netdev_lower_get_first_private_rcu(struct net_device *dev) | |
5880 | { | |
5881 | struct netdev_adjacent *lower; | |
5882 | ||
5883 | lower = list_first_or_null_rcu(&dev->adj_list.lower, | |
5884 | struct netdev_adjacent, list); | |
5885 | if (lower) | |
5886 | return lower->private; | |
5887 | return NULL; | |
5888 | } | |
5889 | EXPORT_SYMBOL(netdev_lower_get_first_private_rcu); | |
5890 | ||
9ff162a8 JP |
5891 | /** |
5892 | * netdev_master_upper_dev_get_rcu - Get master upper device | |
5893 | * @dev: device | |
5894 | * | |
5895 | * Find a master upper device and return pointer to it or NULL in case | |
5896 | * it's not there. The caller must hold the RCU read lock. | |
5897 | */ | |
5898 | struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev) | |
5899 | { | |
aa9d8560 | 5900 | struct netdev_adjacent *upper; |
9ff162a8 | 5901 | |
2f268f12 | 5902 | upper = list_first_or_null_rcu(&dev->adj_list.upper, |
aa9d8560 | 5903 | struct netdev_adjacent, list); |
9ff162a8 JP |
5904 | if (upper && likely(upper->master)) |
5905 | return upper->dev; | |
5906 | return NULL; | |
5907 | } | |
5908 | EXPORT_SYMBOL(netdev_master_upper_dev_get_rcu); | |
5909 | ||
0a59f3a9 | 5910 | static int netdev_adjacent_sysfs_add(struct net_device *dev, |
3ee32707 VF |
5911 | struct net_device *adj_dev, |
5912 | struct list_head *dev_list) | |
5913 | { | |
5914 | char linkname[IFNAMSIZ+7]; | |
f4563a75 | 5915 | |
3ee32707 VF |
5916 | sprintf(linkname, dev_list == &dev->adj_list.upper ? |
5917 | "upper_%s" : "lower_%s", adj_dev->name); | |
5918 | return sysfs_create_link(&(dev->dev.kobj), &(adj_dev->dev.kobj), | |
5919 | linkname); | |
5920 | } | |
0a59f3a9 | 5921 | static void netdev_adjacent_sysfs_del(struct net_device *dev, |
3ee32707 VF |
5922 | char *name, |
5923 | struct list_head *dev_list) | |
5924 | { | |
5925 | char linkname[IFNAMSIZ+7]; | |
f4563a75 | 5926 | |
3ee32707 VF |
5927 | sprintf(linkname, dev_list == &dev->adj_list.upper ? |
5928 | "upper_%s" : "lower_%s", name); | |
5929 | sysfs_remove_link(&(dev->dev.kobj), linkname); | |
5930 | } | |
5931 | ||
7ce64c79 AF |
5932 | static inline bool netdev_adjacent_is_neigh_list(struct net_device *dev, |
5933 | struct net_device *adj_dev, | |
5934 | struct list_head *dev_list) | |
5935 | { | |
5936 | return (dev_list == &dev->adj_list.upper || | |
5937 | dev_list == &dev->adj_list.lower) && | |
5938 | net_eq(dev_net(dev), dev_net(adj_dev)); | |
5939 | } | |
3ee32707 | 5940 | |
5d261913 VF |
5941 | static int __netdev_adjacent_dev_insert(struct net_device *dev, |
5942 | struct net_device *adj_dev, | |
7863c054 | 5943 | struct list_head *dev_list, |
402dae96 | 5944 | void *private, bool master) |
5d261913 VF |
5945 | { |
5946 | struct netdev_adjacent *adj; | |
842d67a7 | 5947 | int ret; |
5d261913 | 5948 | |
6ea29da1 | 5949 | adj = __netdev_find_adj(adj_dev, dev_list); |
5d261913 VF |
5950 | |
5951 | if (adj) { | |
790510d9 | 5952 | adj->ref_nr += 1; |
67b62f98 DA |
5953 | pr_debug("Insert adjacency: dev %s adj_dev %s adj->ref_nr %d\n", |
5954 | dev->name, adj_dev->name, adj->ref_nr); | |
5955 | ||
5d261913 VF |
5956 | return 0; |
5957 | } | |
5958 | ||
5959 | adj = kmalloc(sizeof(*adj), GFP_KERNEL); | |
5960 | if (!adj) | |
5961 | return -ENOMEM; | |
5962 | ||
5963 | adj->dev = adj_dev; | |
5964 | adj->master = master; | |
790510d9 | 5965 | adj->ref_nr = 1; |
402dae96 | 5966 | adj->private = private; |
5d261913 | 5967 | dev_hold(adj_dev); |
2f268f12 | 5968 | |
67b62f98 DA |
5969 | pr_debug("Insert adjacency: dev %s adj_dev %s adj->ref_nr %d; dev_hold on %s\n", |
5970 | dev->name, adj_dev->name, adj->ref_nr, adj_dev->name); | |
5d261913 | 5971 | |
7ce64c79 | 5972 | if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list)) { |
3ee32707 | 5973 | ret = netdev_adjacent_sysfs_add(dev, adj_dev, dev_list); |
5831d66e VF |
5974 | if (ret) |
5975 | goto free_adj; | |
5976 | } | |
5977 | ||
7863c054 | 5978 | /* Ensure that master link is always the first item in list. */ |
842d67a7 VF |
5979 | if (master) { |
5980 | ret = sysfs_create_link(&(dev->dev.kobj), | |
5981 | &(adj_dev->dev.kobj), "master"); | |
5982 | if (ret) | |
5831d66e | 5983 | goto remove_symlinks; |
842d67a7 | 5984 | |
7863c054 | 5985 | list_add_rcu(&adj->list, dev_list); |
842d67a7 | 5986 | } else { |
7863c054 | 5987 | list_add_tail_rcu(&adj->list, dev_list); |
842d67a7 | 5988 | } |
5d261913 VF |
5989 | |
5990 | return 0; | |
842d67a7 | 5991 | |
5831d66e | 5992 | remove_symlinks: |
7ce64c79 | 5993 | if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list)) |
3ee32707 | 5994 | netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list); |
842d67a7 VF |
5995 | free_adj: |
5996 | kfree(adj); | |
974daef7 | 5997 | dev_put(adj_dev); |
842d67a7 VF |
5998 | |
5999 | return ret; | |
5d261913 VF |
6000 | } |
6001 | ||
1d143d9f | 6002 | static void __netdev_adjacent_dev_remove(struct net_device *dev, |
6003 | struct net_device *adj_dev, | |
93409033 | 6004 | u16 ref_nr, |
1d143d9f | 6005 | struct list_head *dev_list) |
5d261913 VF |
6006 | { |
6007 | struct netdev_adjacent *adj; | |
6008 | ||
67b62f98 DA |
6009 | pr_debug("Remove adjacency: dev %s adj_dev %s ref_nr %d\n", |
6010 | dev->name, adj_dev->name, ref_nr); | |
6011 | ||
6ea29da1 | 6012 | adj = __netdev_find_adj(adj_dev, dev_list); |
5d261913 | 6013 | |
2f268f12 | 6014 | if (!adj) { |
67b62f98 | 6015 | pr_err("Adjacency does not exist for device %s from %s\n", |
2f268f12 | 6016 | dev->name, adj_dev->name); |
67b62f98 DA |
6017 | WARN_ON(1); |
6018 | return; | |
2f268f12 | 6019 | } |
5d261913 | 6020 | |
93409033 | 6021 | if (adj->ref_nr > ref_nr) { |
67b62f98 DA |
6022 | pr_debug("adjacency: %s to %s ref_nr - %d = %d\n", |
6023 | dev->name, adj_dev->name, ref_nr, | |
6024 | adj->ref_nr - ref_nr); | |
93409033 | 6025 | adj->ref_nr -= ref_nr; |
5d261913 VF |
6026 | return; |
6027 | } | |
6028 | ||
842d67a7 VF |
6029 | if (adj->master) |
6030 | sysfs_remove_link(&(dev->dev.kobj), "master"); | |
6031 | ||
7ce64c79 | 6032 | if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list)) |
3ee32707 | 6033 | netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list); |
5831d66e | 6034 | |
5d261913 | 6035 | list_del_rcu(&adj->list); |
67b62f98 | 6036 | pr_debug("adjacency: dev_put for %s, because link removed from %s to %s\n", |
2f268f12 | 6037 | adj_dev->name, dev->name, adj_dev->name); |
5d261913 VF |
6038 | dev_put(adj_dev); |
6039 | kfree_rcu(adj, rcu); | |
6040 | } | |
6041 | ||
1d143d9f | 6042 | static int __netdev_adjacent_dev_link_lists(struct net_device *dev, |
6043 | struct net_device *upper_dev, | |
6044 | struct list_head *up_list, | |
6045 | struct list_head *down_list, | |
6046 | void *private, bool master) | |
5d261913 VF |
6047 | { |
6048 | int ret; | |
6049 | ||
790510d9 | 6050 | ret = __netdev_adjacent_dev_insert(dev, upper_dev, up_list, |
93409033 | 6051 | private, master); |
5d261913 VF |
6052 | if (ret) |
6053 | return ret; | |
6054 | ||
790510d9 | 6055 | ret = __netdev_adjacent_dev_insert(upper_dev, dev, down_list, |
93409033 | 6056 | private, false); |
5d261913 | 6057 | if (ret) { |
790510d9 | 6058 | __netdev_adjacent_dev_remove(dev, upper_dev, 1, up_list); |
5d261913 VF |
6059 | return ret; |
6060 | } | |
6061 | ||
6062 | return 0; | |
6063 | } | |
6064 | ||
1d143d9f | 6065 | static void __netdev_adjacent_dev_unlink_lists(struct net_device *dev, |
6066 | struct net_device *upper_dev, | |
93409033 | 6067 | u16 ref_nr, |
1d143d9f | 6068 | struct list_head *up_list, |
6069 | struct list_head *down_list) | |
5d261913 | 6070 | { |
93409033 AC |
6071 | __netdev_adjacent_dev_remove(dev, upper_dev, ref_nr, up_list); |
6072 | __netdev_adjacent_dev_remove(upper_dev, dev, ref_nr, down_list); | |
5d261913 VF |
6073 | } |
6074 | ||
1d143d9f | 6075 | static int __netdev_adjacent_dev_link_neighbour(struct net_device *dev, |
6076 | struct net_device *upper_dev, | |
6077 | void *private, bool master) | |
2f268f12 | 6078 | { |
f1170fd4 DA |
6079 | return __netdev_adjacent_dev_link_lists(dev, upper_dev, |
6080 | &dev->adj_list.upper, | |
6081 | &upper_dev->adj_list.lower, | |
6082 | private, master); | |
5d261913 VF |
6083 | } |
6084 | ||
1d143d9f | 6085 | static void __netdev_adjacent_dev_unlink_neighbour(struct net_device *dev, |
6086 | struct net_device *upper_dev) | |
2f268f12 | 6087 | { |
93409033 | 6088 | __netdev_adjacent_dev_unlink_lists(dev, upper_dev, 1, |
2f268f12 VF |
6089 | &dev->adj_list.upper, |
6090 | &upper_dev->adj_list.lower); | |
6091 | } | |
5d261913 | 6092 | |
9ff162a8 | 6093 | static int __netdev_upper_dev_link(struct net_device *dev, |
402dae96 | 6094 | struct net_device *upper_dev, bool master, |
29bf24af | 6095 | void *upper_priv, void *upper_info) |
9ff162a8 | 6096 | { |
0e4ead9d | 6097 | struct netdev_notifier_changeupper_info changeupper_info; |
5d261913 | 6098 | int ret = 0; |
9ff162a8 JP |
6099 | |
6100 | ASSERT_RTNL(); | |
6101 | ||
6102 | if (dev == upper_dev) | |
6103 | return -EBUSY; | |
6104 | ||
6105 | /* To prevent loops, check if dev is not upper device to upper_dev. */ | |
f1170fd4 | 6106 | if (netdev_has_upper_dev(upper_dev, dev)) |
9ff162a8 JP |
6107 | return -EBUSY; |
6108 | ||
f1170fd4 | 6109 | if (netdev_has_upper_dev(dev, upper_dev)) |
9ff162a8 JP |
6110 | return -EEXIST; |
6111 | ||
6112 | if (master && netdev_master_upper_dev_get(dev)) | |
6113 | return -EBUSY; | |
6114 | ||
0e4ead9d JP |
6115 | changeupper_info.upper_dev = upper_dev; |
6116 | changeupper_info.master = master; | |
6117 | changeupper_info.linking = true; | |
29bf24af | 6118 | changeupper_info.upper_info = upper_info; |
0e4ead9d | 6119 | |
573c7ba0 JP |
6120 | ret = call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER, dev, |
6121 | &changeupper_info.info); | |
6122 | ret = notifier_to_errno(ret); | |
6123 | if (ret) | |
6124 | return ret; | |
6125 | ||
6dffb044 | 6126 | ret = __netdev_adjacent_dev_link_neighbour(dev, upper_dev, upper_priv, |
402dae96 | 6127 | master); |
5d261913 VF |
6128 | if (ret) |
6129 | return ret; | |
9ff162a8 | 6130 | |
b03804e7 IS |
6131 | ret = call_netdevice_notifiers_info(NETDEV_CHANGEUPPER, dev, |
6132 | &changeupper_info.info); | |
6133 | ret = notifier_to_errno(ret); | |
6134 | if (ret) | |
f1170fd4 | 6135 | goto rollback; |
b03804e7 | 6136 | |
9ff162a8 | 6137 | return 0; |
5d261913 | 6138 | |
f1170fd4 | 6139 | rollback: |
2f268f12 | 6140 | __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev); |
5d261913 VF |
6141 | |
6142 | return ret; | |
9ff162a8 JP |
6143 | } |
6144 | ||
6145 | /** | |
6146 | * netdev_upper_dev_link - Add a link to the upper device | |
6147 | * @dev: device | |
6148 | * @upper_dev: new upper device | |
6149 | * | |
6150 | * Adds a link to device which is upper to this one. The caller must hold | |
6151 | * the RTNL lock. On a failure a negative errno code is returned. | |
6152 | * On success the reference counts are adjusted and the function | |
6153 | * returns zero. | |
6154 | */ | |
6155 | int netdev_upper_dev_link(struct net_device *dev, | |
6156 | struct net_device *upper_dev) | |
6157 | { | |
29bf24af | 6158 | return __netdev_upper_dev_link(dev, upper_dev, false, NULL, NULL); |
9ff162a8 JP |
6159 | } |
6160 | EXPORT_SYMBOL(netdev_upper_dev_link); | |
6161 | ||
6162 | /** | |
6163 | * netdev_master_upper_dev_link - Add a master link to the upper device | |
6164 | * @dev: device | |
6165 | * @upper_dev: new upper device | |
6dffb044 | 6166 | * @upper_priv: upper device private |
29bf24af | 6167 | * @upper_info: upper info to be passed down via notifier |
9ff162a8 JP |
6168 | * |
6169 | * Adds a link to device which is upper to this one. In this case, only | |
6170 | * one master upper device can be linked, although other non-master devices | |
6171 | * might be linked as well. The caller must hold the RTNL lock. | |
6172 | * On a failure a negative errno code is returned. On success the reference | |
6173 | * counts are adjusted and the function returns zero. | |
6174 | */ | |
6175 | int netdev_master_upper_dev_link(struct net_device *dev, | |
6dffb044 | 6176 | struct net_device *upper_dev, |
29bf24af | 6177 | void *upper_priv, void *upper_info) |
9ff162a8 | 6178 | { |
29bf24af JP |
6179 | return __netdev_upper_dev_link(dev, upper_dev, true, |
6180 | upper_priv, upper_info); | |
9ff162a8 JP |
6181 | } |
6182 | EXPORT_SYMBOL(netdev_master_upper_dev_link); | |
6183 | ||
6184 | /** | |
6185 | * netdev_upper_dev_unlink - Removes a link to upper device | |
6186 | * @dev: device | |
6187 | * @upper_dev: new upper device | |
6188 | * | |
6189 | * Removes a link to device which is upper to this one. The caller must hold | |
6190 | * the RTNL lock. | |
6191 | */ | |
6192 | void netdev_upper_dev_unlink(struct net_device *dev, | |
6193 | struct net_device *upper_dev) | |
6194 | { | |
0e4ead9d | 6195 | struct netdev_notifier_changeupper_info changeupper_info; |
f4563a75 | 6196 | |
9ff162a8 JP |
6197 | ASSERT_RTNL(); |
6198 | ||
0e4ead9d JP |
6199 | changeupper_info.upper_dev = upper_dev; |
6200 | changeupper_info.master = netdev_master_upper_dev_get(dev) == upper_dev; | |
6201 | changeupper_info.linking = false; | |
6202 | ||
573c7ba0 JP |
6203 | call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER, dev, |
6204 | &changeupper_info.info); | |
6205 | ||
2f268f12 | 6206 | __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev); |
5d261913 | 6207 | |
0e4ead9d JP |
6208 | call_netdevice_notifiers_info(NETDEV_CHANGEUPPER, dev, |
6209 | &changeupper_info.info); | |
9ff162a8 JP |
6210 | } |
6211 | EXPORT_SYMBOL(netdev_upper_dev_unlink); | |
6212 | ||
61bd3857 MS |
6213 | /** |
6214 | * netdev_bonding_info_change - Dispatch event about slave change | |
6215 | * @dev: device | |
4a26e453 | 6216 | * @bonding_info: info to dispatch |
61bd3857 MS |
6217 | * |
6218 | * Send NETDEV_BONDING_INFO to netdev notifiers with info. | |
6219 | * The caller must hold the RTNL lock. | |
6220 | */ | |
6221 | void netdev_bonding_info_change(struct net_device *dev, | |
6222 | struct netdev_bonding_info *bonding_info) | |
6223 | { | |
6224 | struct netdev_notifier_bonding_info info; | |
6225 | ||
6226 | memcpy(&info.bonding_info, bonding_info, | |
6227 | sizeof(struct netdev_bonding_info)); | |
6228 | call_netdevice_notifiers_info(NETDEV_BONDING_INFO, dev, | |
6229 | &info.info); | |
6230 | } | |
6231 | EXPORT_SYMBOL(netdev_bonding_info_change); | |
6232 | ||
2ce1ee17 | 6233 | static void netdev_adjacent_add_links(struct net_device *dev) |
4c75431a AF |
6234 | { |
6235 | struct netdev_adjacent *iter; | |
6236 | ||
6237 | struct net *net = dev_net(dev); | |
6238 | ||
6239 | list_for_each_entry(iter, &dev->adj_list.upper, list) { | |
be4da0e3 | 6240 | if (!net_eq(net, dev_net(iter->dev))) |
4c75431a AF |
6241 | continue; |
6242 | netdev_adjacent_sysfs_add(iter->dev, dev, | |
6243 | &iter->dev->adj_list.lower); | |
6244 | netdev_adjacent_sysfs_add(dev, iter->dev, | |
6245 | &dev->adj_list.upper); | |
6246 | } | |
6247 | ||
6248 | list_for_each_entry(iter, &dev->adj_list.lower, list) { | |
be4da0e3 | 6249 | if (!net_eq(net, dev_net(iter->dev))) |
4c75431a AF |
6250 | continue; |
6251 | netdev_adjacent_sysfs_add(iter->dev, dev, | |
6252 | &iter->dev->adj_list.upper); | |
6253 | netdev_adjacent_sysfs_add(dev, iter->dev, | |
6254 | &dev->adj_list.lower); | |
6255 | } | |
6256 | } | |
6257 | ||
2ce1ee17 | 6258 | static void netdev_adjacent_del_links(struct net_device *dev) |
4c75431a AF |
6259 | { |
6260 | struct netdev_adjacent *iter; | |
6261 | ||
6262 | struct net *net = dev_net(dev); | |
6263 | ||
6264 | list_for_each_entry(iter, &dev->adj_list.upper, list) { | |
be4da0e3 | 6265 | if (!net_eq(net, dev_net(iter->dev))) |
4c75431a AF |
6266 | continue; |
6267 | netdev_adjacent_sysfs_del(iter->dev, dev->name, | |
6268 | &iter->dev->adj_list.lower); | |
6269 | netdev_adjacent_sysfs_del(dev, iter->dev->name, | |
6270 | &dev->adj_list.upper); | |
6271 | } | |
6272 | ||
6273 | list_for_each_entry(iter, &dev->adj_list.lower, list) { | |
be4da0e3 | 6274 | if (!net_eq(net, dev_net(iter->dev))) |
4c75431a AF |
6275 | continue; |
6276 | netdev_adjacent_sysfs_del(iter->dev, dev->name, | |
6277 | &iter->dev->adj_list.upper); | |
6278 | netdev_adjacent_sysfs_del(dev, iter->dev->name, | |
6279 | &dev->adj_list.lower); | |
6280 | } | |
6281 | } | |
6282 | ||
5bb025fa | 6283 | void netdev_adjacent_rename_links(struct net_device *dev, char *oldname) |
402dae96 | 6284 | { |
5bb025fa | 6285 | struct netdev_adjacent *iter; |
402dae96 | 6286 | |
4c75431a AF |
6287 | struct net *net = dev_net(dev); |
6288 | ||
5bb025fa | 6289 | list_for_each_entry(iter, &dev->adj_list.upper, list) { |
be4da0e3 | 6290 | if (!net_eq(net, dev_net(iter->dev))) |
4c75431a | 6291 | continue; |
5bb025fa VF |
6292 | netdev_adjacent_sysfs_del(iter->dev, oldname, |
6293 | &iter->dev->adj_list.lower); | |
6294 | netdev_adjacent_sysfs_add(iter->dev, dev, | |
6295 | &iter->dev->adj_list.lower); | |
6296 | } | |
402dae96 | 6297 | |
5bb025fa | 6298 | list_for_each_entry(iter, &dev->adj_list.lower, list) { |
be4da0e3 | 6299 | if (!net_eq(net, dev_net(iter->dev))) |
4c75431a | 6300 | continue; |
5bb025fa VF |
6301 | netdev_adjacent_sysfs_del(iter->dev, oldname, |
6302 | &iter->dev->adj_list.upper); | |
6303 | netdev_adjacent_sysfs_add(iter->dev, dev, | |
6304 | &iter->dev->adj_list.upper); | |
6305 | } | |
402dae96 | 6306 | } |
402dae96 VF |
6307 | |
6308 | void *netdev_lower_dev_get_private(struct net_device *dev, | |
6309 | struct net_device *lower_dev) | |
6310 | { | |
6311 | struct netdev_adjacent *lower; | |
6312 | ||
6313 | if (!lower_dev) | |
6314 | return NULL; | |
6ea29da1 | 6315 | lower = __netdev_find_adj(lower_dev, &dev->adj_list.lower); |
402dae96 VF |
6316 | if (!lower) |
6317 | return NULL; | |
6318 | ||
6319 | return lower->private; | |
6320 | } | |
6321 | EXPORT_SYMBOL(netdev_lower_dev_get_private); | |
6322 | ||
4085ebe8 | 6323 | |
952fcfd0 | 6324 | int dev_get_nest_level(struct net_device *dev) |
4085ebe8 VY |
6325 | { |
6326 | struct net_device *lower = NULL; | |
6327 | struct list_head *iter; | |
6328 | int max_nest = -1; | |
6329 | int nest; | |
6330 | ||
6331 | ASSERT_RTNL(); | |
6332 | ||
6333 | netdev_for_each_lower_dev(dev, lower, iter) { | |
952fcfd0 | 6334 | nest = dev_get_nest_level(lower); |
4085ebe8 VY |
6335 | if (max_nest < nest) |
6336 | max_nest = nest; | |
6337 | } | |
6338 | ||
952fcfd0 | 6339 | return max_nest + 1; |
4085ebe8 VY |
6340 | } |
6341 | EXPORT_SYMBOL(dev_get_nest_level); | |
6342 | ||
04d48266 JP |
6343 | /** |
6344 | * netdev_lower_change - Dispatch event about lower device state change | |
6345 | * @lower_dev: device | |
6346 | * @lower_state_info: state to dispatch | |
6347 | * | |
6348 | * Send NETDEV_CHANGELOWERSTATE to netdev notifiers with info. | |
6349 | * The caller must hold the RTNL lock. | |
6350 | */ | |
6351 | void netdev_lower_state_changed(struct net_device *lower_dev, | |
6352 | void *lower_state_info) | |
6353 | { | |
6354 | struct netdev_notifier_changelowerstate_info changelowerstate_info; | |
6355 | ||
6356 | ASSERT_RTNL(); | |
6357 | changelowerstate_info.lower_state_info = lower_state_info; | |
6358 | call_netdevice_notifiers_info(NETDEV_CHANGELOWERSTATE, lower_dev, | |
6359 | &changelowerstate_info.info); | |
6360 | } | |
6361 | EXPORT_SYMBOL(netdev_lower_state_changed); | |
6362 | ||
b6c40d68 PM |
6363 | static void dev_change_rx_flags(struct net_device *dev, int flags) |
6364 | { | |
d314774c SH |
6365 | const struct net_device_ops *ops = dev->netdev_ops; |
6366 | ||
d2615bf4 | 6367 | if (ops->ndo_change_rx_flags) |
d314774c | 6368 | ops->ndo_change_rx_flags(dev, flags); |
b6c40d68 PM |
6369 | } |
6370 | ||
991fb3f7 | 6371 | static int __dev_set_promiscuity(struct net_device *dev, int inc, bool notify) |
1da177e4 | 6372 | { |
b536db93 | 6373 | unsigned int old_flags = dev->flags; |
d04a48b0 EB |
6374 | kuid_t uid; |
6375 | kgid_t gid; | |
1da177e4 | 6376 | |
24023451 PM |
6377 | ASSERT_RTNL(); |
6378 | ||
dad9b335 WC |
6379 | dev->flags |= IFF_PROMISC; |
6380 | dev->promiscuity += inc; | |
6381 | if (dev->promiscuity == 0) { | |
6382 | /* | |
6383 | * Avoid overflow. | |
6384 | * If inc causes overflow, untouch promisc and return error. | |
6385 | */ | |
6386 | if (inc < 0) | |
6387 | dev->flags &= ~IFF_PROMISC; | |
6388 | else { | |
6389 | dev->promiscuity -= inc; | |
7b6cd1ce JP |
6390 | pr_warn("%s: promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n", |
6391 | dev->name); | |
dad9b335 WC |
6392 | return -EOVERFLOW; |
6393 | } | |
6394 | } | |
52609c0b | 6395 | if (dev->flags != old_flags) { |
7b6cd1ce JP |
6396 | pr_info("device %s %s promiscuous mode\n", |
6397 | dev->name, | |
6398 | dev->flags & IFF_PROMISC ? "entered" : "left"); | |
8192b0c4 DH |
6399 | if (audit_enabled) { |
6400 | current_uid_gid(&uid, &gid); | |
7759db82 KHK |
6401 | audit_log(current->audit_context, GFP_ATOMIC, |
6402 | AUDIT_ANOM_PROMISCUOUS, | |
6403 | "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u", | |
6404 | dev->name, (dev->flags & IFF_PROMISC), | |
6405 | (old_flags & IFF_PROMISC), | |
e1760bd5 | 6406 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
d04a48b0 EB |
6407 | from_kuid(&init_user_ns, uid), |
6408 | from_kgid(&init_user_ns, gid), | |
7759db82 | 6409 | audit_get_sessionid(current)); |
8192b0c4 | 6410 | } |
24023451 | 6411 | |
b6c40d68 | 6412 | dev_change_rx_flags(dev, IFF_PROMISC); |
1da177e4 | 6413 | } |
991fb3f7 ND |
6414 | if (notify) |
6415 | __dev_notify_flags(dev, old_flags, IFF_PROMISC); | |
dad9b335 | 6416 | return 0; |
1da177e4 LT |
6417 | } |
6418 | ||
4417da66 PM |
6419 | /** |
6420 | * dev_set_promiscuity - update promiscuity count on a device | |
6421 | * @dev: device | |
6422 | * @inc: modifier | |
6423 | * | |
6424 | * Add or remove promiscuity from a device. While the count in the device | |
6425 | * remains above zero the interface remains promiscuous. Once it hits zero | |
6426 | * the device reverts back to normal filtering operation. A negative inc | |
6427 | * value is used to drop promiscuity on the device. | |
dad9b335 | 6428 | * Return 0 if successful or a negative errno code on error. |
4417da66 | 6429 | */ |
dad9b335 | 6430 | int dev_set_promiscuity(struct net_device *dev, int inc) |
4417da66 | 6431 | { |
b536db93 | 6432 | unsigned int old_flags = dev->flags; |
dad9b335 | 6433 | int err; |
4417da66 | 6434 | |
991fb3f7 | 6435 | err = __dev_set_promiscuity(dev, inc, true); |
4b5a698e | 6436 | if (err < 0) |
dad9b335 | 6437 | return err; |
4417da66 PM |
6438 | if (dev->flags != old_flags) |
6439 | dev_set_rx_mode(dev); | |
dad9b335 | 6440 | return err; |
4417da66 | 6441 | } |
d1b19dff | 6442 | EXPORT_SYMBOL(dev_set_promiscuity); |
4417da66 | 6443 | |
991fb3f7 | 6444 | static int __dev_set_allmulti(struct net_device *dev, int inc, bool notify) |
1da177e4 | 6445 | { |
991fb3f7 | 6446 | unsigned int old_flags = dev->flags, old_gflags = dev->gflags; |
1da177e4 | 6447 | |
24023451 PM |
6448 | ASSERT_RTNL(); |
6449 | ||
1da177e4 | 6450 | dev->flags |= IFF_ALLMULTI; |
dad9b335 WC |
6451 | dev->allmulti += inc; |
6452 | if (dev->allmulti == 0) { | |
6453 | /* | |
6454 | * Avoid overflow. | |
6455 | * If inc causes overflow, untouch allmulti and return error. | |
6456 | */ | |
6457 | if (inc < 0) | |
6458 | dev->flags &= ~IFF_ALLMULTI; | |
6459 | else { | |
6460 | dev->allmulti -= inc; | |
7b6cd1ce JP |
6461 | pr_warn("%s: allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n", |
6462 | dev->name); | |
dad9b335 WC |
6463 | return -EOVERFLOW; |
6464 | } | |
6465 | } | |
24023451 | 6466 | if (dev->flags ^ old_flags) { |
b6c40d68 | 6467 | dev_change_rx_flags(dev, IFF_ALLMULTI); |
4417da66 | 6468 | dev_set_rx_mode(dev); |
991fb3f7 ND |
6469 | if (notify) |
6470 | __dev_notify_flags(dev, old_flags, | |
6471 | dev->gflags ^ old_gflags); | |
24023451 | 6472 | } |
dad9b335 | 6473 | return 0; |
4417da66 | 6474 | } |
991fb3f7 ND |
6475 | |
6476 | /** | |
6477 | * dev_set_allmulti - update allmulti count on a device | |
6478 | * @dev: device | |
6479 | * @inc: modifier | |
6480 | * | |
6481 | * Add or remove reception of all multicast frames to a device. While the | |
6482 | * count in the device remains above zero the interface remains listening | |
6483 | * to all interfaces. Once it hits zero the device reverts back to normal | |
6484 | * filtering operation. A negative @inc value is used to drop the counter | |
6485 | * when releasing a resource needing all multicasts. | |
6486 | * Return 0 if successful or a negative errno code on error. | |
6487 | */ | |
6488 | ||
6489 | int dev_set_allmulti(struct net_device *dev, int inc) | |
6490 | { | |
6491 | return __dev_set_allmulti(dev, inc, true); | |
6492 | } | |
d1b19dff | 6493 | EXPORT_SYMBOL(dev_set_allmulti); |
4417da66 PM |
6494 | |
6495 | /* | |
6496 | * Upload unicast and multicast address lists to device and | |
6497 | * configure RX filtering. When the device doesn't support unicast | |
53ccaae1 | 6498 | * filtering it is put in promiscuous mode while unicast addresses |
4417da66 PM |
6499 | * are present. |
6500 | */ | |
6501 | void __dev_set_rx_mode(struct net_device *dev) | |
6502 | { | |
d314774c SH |
6503 | const struct net_device_ops *ops = dev->netdev_ops; |
6504 | ||
4417da66 PM |
6505 | /* dev_open will call this function so the list will stay sane. */ |
6506 | if (!(dev->flags&IFF_UP)) | |
6507 | return; | |
6508 | ||
6509 | if (!netif_device_present(dev)) | |
40b77c94 | 6510 | return; |
4417da66 | 6511 | |
01789349 | 6512 | if (!(dev->priv_flags & IFF_UNICAST_FLT)) { |
4417da66 PM |
6513 | /* Unicast addresses changes may only happen under the rtnl, |
6514 | * therefore calling __dev_set_promiscuity here is safe. | |
6515 | */ | |
32e7bfc4 | 6516 | if (!netdev_uc_empty(dev) && !dev->uc_promisc) { |
991fb3f7 | 6517 | __dev_set_promiscuity(dev, 1, false); |
2d348d1f | 6518 | dev->uc_promisc = true; |
32e7bfc4 | 6519 | } else if (netdev_uc_empty(dev) && dev->uc_promisc) { |
991fb3f7 | 6520 | __dev_set_promiscuity(dev, -1, false); |
2d348d1f | 6521 | dev->uc_promisc = false; |
4417da66 | 6522 | } |
4417da66 | 6523 | } |
01789349 JP |
6524 | |
6525 | if (ops->ndo_set_rx_mode) | |
6526 | ops->ndo_set_rx_mode(dev); | |
4417da66 PM |
6527 | } |
6528 | ||
6529 | void dev_set_rx_mode(struct net_device *dev) | |
6530 | { | |
b9e40857 | 6531 | netif_addr_lock_bh(dev); |
4417da66 | 6532 | __dev_set_rx_mode(dev); |
b9e40857 | 6533 | netif_addr_unlock_bh(dev); |
1da177e4 LT |
6534 | } |
6535 | ||
f0db275a SH |
6536 | /** |
6537 | * dev_get_flags - get flags reported to userspace | |
6538 | * @dev: device | |
6539 | * | |
6540 | * Get the combination of flag bits exported through APIs to userspace. | |
6541 | */ | |
95c96174 | 6542 | unsigned int dev_get_flags(const struct net_device *dev) |
1da177e4 | 6543 | { |
95c96174 | 6544 | unsigned int flags; |
1da177e4 LT |
6545 | |
6546 | flags = (dev->flags & ~(IFF_PROMISC | | |
6547 | IFF_ALLMULTI | | |
b00055aa SR |
6548 | IFF_RUNNING | |
6549 | IFF_LOWER_UP | | |
6550 | IFF_DORMANT)) | | |
1da177e4 LT |
6551 | (dev->gflags & (IFF_PROMISC | |
6552 | IFF_ALLMULTI)); | |
6553 | ||
b00055aa SR |
6554 | if (netif_running(dev)) { |
6555 | if (netif_oper_up(dev)) | |
6556 | flags |= IFF_RUNNING; | |
6557 | if (netif_carrier_ok(dev)) | |
6558 | flags |= IFF_LOWER_UP; | |
6559 | if (netif_dormant(dev)) | |
6560 | flags |= IFF_DORMANT; | |
6561 | } | |
1da177e4 LT |
6562 | |
6563 | return flags; | |
6564 | } | |
d1b19dff | 6565 | EXPORT_SYMBOL(dev_get_flags); |
1da177e4 | 6566 | |
bd380811 | 6567 | int __dev_change_flags(struct net_device *dev, unsigned int flags) |
1da177e4 | 6568 | { |
b536db93 | 6569 | unsigned int old_flags = dev->flags; |
bd380811 | 6570 | int ret; |
1da177e4 | 6571 | |
24023451 PM |
6572 | ASSERT_RTNL(); |
6573 | ||
1da177e4 LT |
6574 | /* |
6575 | * Set the flags on our device. | |
6576 | */ | |
6577 | ||
6578 | dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP | | |
6579 | IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL | | |
6580 | IFF_AUTOMEDIA)) | | |
6581 | (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC | | |
6582 | IFF_ALLMULTI)); | |
6583 | ||
6584 | /* | |
6585 | * Load in the correct multicast list now the flags have changed. | |
6586 | */ | |
6587 | ||
b6c40d68 PM |
6588 | if ((old_flags ^ flags) & IFF_MULTICAST) |
6589 | dev_change_rx_flags(dev, IFF_MULTICAST); | |
24023451 | 6590 | |
4417da66 | 6591 | dev_set_rx_mode(dev); |
1da177e4 LT |
6592 | |
6593 | /* | |
6594 | * Have we downed the interface. We handle IFF_UP ourselves | |
6595 | * according to user attempts to set it, rather than blindly | |
6596 | * setting it. | |
6597 | */ | |
6598 | ||
6599 | ret = 0; | |
d215d10f | 6600 | if ((old_flags ^ flags) & IFF_UP) |
bd380811 | 6601 | ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev); |
1da177e4 | 6602 | |
1da177e4 | 6603 | if ((flags ^ dev->gflags) & IFF_PROMISC) { |
d1b19dff | 6604 | int inc = (flags & IFF_PROMISC) ? 1 : -1; |
991fb3f7 | 6605 | unsigned int old_flags = dev->flags; |
d1b19dff | 6606 | |
1da177e4 | 6607 | dev->gflags ^= IFF_PROMISC; |
991fb3f7 ND |
6608 | |
6609 | if (__dev_set_promiscuity(dev, inc, false) >= 0) | |
6610 | if (dev->flags != old_flags) | |
6611 | dev_set_rx_mode(dev); | |
1da177e4 LT |
6612 | } |
6613 | ||
6614 | /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI | |
eb13da1a | 6615 | * is important. Some (broken) drivers set IFF_PROMISC, when |
6616 | * IFF_ALLMULTI is requested not asking us and not reporting. | |
1da177e4 LT |
6617 | */ |
6618 | if ((flags ^ dev->gflags) & IFF_ALLMULTI) { | |
d1b19dff ED |
6619 | int inc = (flags & IFF_ALLMULTI) ? 1 : -1; |
6620 | ||
1da177e4 | 6621 | dev->gflags ^= IFF_ALLMULTI; |
991fb3f7 | 6622 | __dev_set_allmulti(dev, inc, false); |
1da177e4 LT |
6623 | } |
6624 | ||
bd380811 PM |
6625 | return ret; |
6626 | } | |
6627 | ||
a528c219 ND |
6628 | void __dev_notify_flags(struct net_device *dev, unsigned int old_flags, |
6629 | unsigned int gchanges) | |
bd380811 PM |
6630 | { |
6631 | unsigned int changes = dev->flags ^ old_flags; | |
6632 | ||
a528c219 | 6633 | if (gchanges) |
7f294054 | 6634 | rtmsg_ifinfo(RTM_NEWLINK, dev, gchanges, GFP_ATOMIC); |
a528c219 | 6635 | |
bd380811 PM |
6636 | if (changes & IFF_UP) { |
6637 | if (dev->flags & IFF_UP) | |
6638 | call_netdevice_notifiers(NETDEV_UP, dev); | |
6639 | else | |
6640 | call_netdevice_notifiers(NETDEV_DOWN, dev); | |
6641 | } | |
6642 | ||
6643 | if (dev->flags & IFF_UP && | |
be9efd36 JP |
6644 | (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE))) { |
6645 | struct netdev_notifier_change_info change_info; | |
6646 | ||
6647 | change_info.flags_changed = changes; | |
6648 | call_netdevice_notifiers_info(NETDEV_CHANGE, dev, | |
6649 | &change_info.info); | |
6650 | } | |
bd380811 PM |
6651 | } |
6652 | ||
6653 | /** | |
6654 | * dev_change_flags - change device settings | |
6655 | * @dev: device | |
6656 | * @flags: device state flags | |
6657 | * | |
6658 | * Change settings on device based state flags. The flags are | |
6659 | * in the userspace exported format. | |
6660 | */ | |
b536db93 | 6661 | int dev_change_flags(struct net_device *dev, unsigned int flags) |
bd380811 | 6662 | { |
b536db93 | 6663 | int ret; |
991fb3f7 | 6664 | unsigned int changes, old_flags = dev->flags, old_gflags = dev->gflags; |
bd380811 PM |
6665 | |
6666 | ret = __dev_change_flags(dev, flags); | |
6667 | if (ret < 0) | |
6668 | return ret; | |
6669 | ||
991fb3f7 | 6670 | changes = (old_flags ^ dev->flags) | (old_gflags ^ dev->gflags); |
a528c219 | 6671 | __dev_notify_flags(dev, old_flags, changes); |
1da177e4 LT |
6672 | return ret; |
6673 | } | |
d1b19dff | 6674 | EXPORT_SYMBOL(dev_change_flags); |
1da177e4 | 6675 | |
2315dc91 VF |
6676 | static int __dev_set_mtu(struct net_device *dev, int new_mtu) |
6677 | { | |
6678 | const struct net_device_ops *ops = dev->netdev_ops; | |
6679 | ||
6680 | if (ops->ndo_change_mtu) | |
6681 | return ops->ndo_change_mtu(dev, new_mtu); | |
6682 | ||
6683 | dev->mtu = new_mtu; | |
6684 | return 0; | |
6685 | } | |
6686 | ||
f0db275a SH |
6687 | /** |
6688 | * dev_set_mtu - Change maximum transfer unit | |
6689 | * @dev: device | |
6690 | * @new_mtu: new transfer unit | |
6691 | * | |
6692 | * Change the maximum transfer size of the network device. | |
6693 | */ | |
1da177e4 LT |
6694 | int dev_set_mtu(struct net_device *dev, int new_mtu) |
6695 | { | |
2315dc91 | 6696 | int err, orig_mtu; |
1da177e4 LT |
6697 | |
6698 | if (new_mtu == dev->mtu) | |
6699 | return 0; | |
6700 | ||
61e84623 JW |
6701 | /* MTU must be positive, and in range */ |
6702 | if (new_mtu < 0 || new_mtu < dev->min_mtu) { | |
6703 | net_err_ratelimited("%s: Invalid MTU %d requested, hw min %d\n", | |
6704 | dev->name, new_mtu, dev->min_mtu); | |
1da177e4 | 6705 | return -EINVAL; |
61e84623 JW |
6706 | } |
6707 | ||
6708 | if (dev->max_mtu > 0 && new_mtu > dev->max_mtu) { | |
6709 | net_err_ratelimited("%s: Invalid MTU %d requested, hw max %d\n", | |
a0e65de7 | 6710 | dev->name, new_mtu, dev->max_mtu); |
61e84623 JW |
6711 | return -EINVAL; |
6712 | } | |
1da177e4 LT |
6713 | |
6714 | if (!netif_device_present(dev)) | |
6715 | return -ENODEV; | |
6716 | ||
1d486bfb VF |
6717 | err = call_netdevice_notifiers(NETDEV_PRECHANGEMTU, dev); |
6718 | err = notifier_to_errno(err); | |
6719 | if (err) | |
6720 | return err; | |
d314774c | 6721 | |
2315dc91 VF |
6722 | orig_mtu = dev->mtu; |
6723 | err = __dev_set_mtu(dev, new_mtu); | |
d314774c | 6724 | |
2315dc91 VF |
6725 | if (!err) { |
6726 | err = call_netdevice_notifiers(NETDEV_CHANGEMTU, dev); | |
6727 | err = notifier_to_errno(err); | |
6728 | if (err) { | |
6729 | /* setting mtu back and notifying everyone again, | |
6730 | * so that they have a chance to revert changes. | |
6731 | */ | |
6732 | __dev_set_mtu(dev, orig_mtu); | |
6733 | call_netdevice_notifiers(NETDEV_CHANGEMTU, dev); | |
6734 | } | |
6735 | } | |
1da177e4 LT |
6736 | return err; |
6737 | } | |
d1b19dff | 6738 | EXPORT_SYMBOL(dev_set_mtu); |
1da177e4 | 6739 | |
cbda10fa VD |
6740 | /** |
6741 | * dev_set_group - Change group this device belongs to | |
6742 | * @dev: device | |
6743 | * @new_group: group this device should belong to | |
6744 | */ | |
6745 | void dev_set_group(struct net_device *dev, int new_group) | |
6746 | { | |
6747 | dev->group = new_group; | |
6748 | } | |
6749 | EXPORT_SYMBOL(dev_set_group); | |
6750 | ||
f0db275a SH |
6751 | /** |
6752 | * dev_set_mac_address - Change Media Access Control Address | |
6753 | * @dev: device | |
6754 | * @sa: new address | |
6755 | * | |
6756 | * Change the hardware (MAC) address of the device | |
6757 | */ | |
1da177e4 LT |
6758 | int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa) |
6759 | { | |
d314774c | 6760 | const struct net_device_ops *ops = dev->netdev_ops; |
1da177e4 LT |
6761 | int err; |
6762 | ||
d314774c | 6763 | if (!ops->ndo_set_mac_address) |
1da177e4 LT |
6764 | return -EOPNOTSUPP; |
6765 | if (sa->sa_family != dev->type) | |
6766 | return -EINVAL; | |
6767 | if (!netif_device_present(dev)) | |
6768 | return -ENODEV; | |
d314774c | 6769 | err = ops->ndo_set_mac_address(dev, sa); |
f6521516 JP |
6770 | if (err) |
6771 | return err; | |
fbdeca2d | 6772 | dev->addr_assign_type = NET_ADDR_SET; |
f6521516 | 6773 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); |
7bf23575 | 6774 | add_device_randomness(dev->dev_addr, dev->addr_len); |
f6521516 | 6775 | return 0; |
1da177e4 | 6776 | } |
d1b19dff | 6777 | EXPORT_SYMBOL(dev_set_mac_address); |
1da177e4 | 6778 | |
4bf84c35 JP |
6779 | /** |
6780 | * dev_change_carrier - Change device carrier | |
6781 | * @dev: device | |
691b3b7e | 6782 | * @new_carrier: new value |
4bf84c35 JP |
6783 | * |
6784 | * Change device carrier | |
6785 | */ | |
6786 | int dev_change_carrier(struct net_device *dev, bool new_carrier) | |
6787 | { | |
6788 | const struct net_device_ops *ops = dev->netdev_ops; | |
6789 | ||
6790 | if (!ops->ndo_change_carrier) | |
6791 | return -EOPNOTSUPP; | |
6792 | if (!netif_device_present(dev)) | |
6793 | return -ENODEV; | |
6794 | return ops->ndo_change_carrier(dev, new_carrier); | |
6795 | } | |
6796 | EXPORT_SYMBOL(dev_change_carrier); | |
6797 | ||
66b52b0d JP |
6798 | /** |
6799 | * dev_get_phys_port_id - Get device physical port ID | |
6800 | * @dev: device | |
6801 | * @ppid: port ID | |
6802 | * | |
6803 | * Get device physical port ID | |
6804 | */ | |
6805 | int dev_get_phys_port_id(struct net_device *dev, | |
02637fce | 6806 | struct netdev_phys_item_id *ppid) |
66b52b0d JP |
6807 | { |
6808 | const struct net_device_ops *ops = dev->netdev_ops; | |
6809 | ||
6810 | if (!ops->ndo_get_phys_port_id) | |
6811 | return -EOPNOTSUPP; | |
6812 | return ops->ndo_get_phys_port_id(dev, ppid); | |
6813 | } | |
6814 | EXPORT_SYMBOL(dev_get_phys_port_id); | |
6815 | ||
db24a904 DA |
6816 | /** |
6817 | * dev_get_phys_port_name - Get device physical port name | |
6818 | * @dev: device | |
6819 | * @name: port name | |
ed49e650 | 6820 | * @len: limit of bytes to copy to name |
db24a904 DA |
6821 | * |
6822 | * Get device physical port name | |
6823 | */ | |
6824 | int dev_get_phys_port_name(struct net_device *dev, | |
6825 | char *name, size_t len) | |
6826 | { | |
6827 | const struct net_device_ops *ops = dev->netdev_ops; | |
6828 | ||
6829 | if (!ops->ndo_get_phys_port_name) | |
6830 | return -EOPNOTSUPP; | |
6831 | return ops->ndo_get_phys_port_name(dev, name, len); | |
6832 | } | |
6833 | EXPORT_SYMBOL(dev_get_phys_port_name); | |
6834 | ||
d746d707 AK |
6835 | /** |
6836 | * dev_change_proto_down - update protocol port state information | |
6837 | * @dev: device | |
6838 | * @proto_down: new value | |
6839 | * | |
6840 | * This info can be used by switch drivers to set the phys state of the | |
6841 | * port. | |
6842 | */ | |
6843 | int dev_change_proto_down(struct net_device *dev, bool proto_down) | |
6844 | { | |
6845 | const struct net_device_ops *ops = dev->netdev_ops; | |
6846 | ||
6847 | if (!ops->ndo_change_proto_down) | |
6848 | return -EOPNOTSUPP; | |
6849 | if (!netif_device_present(dev)) | |
6850 | return -ENODEV; | |
6851 | return ops->ndo_change_proto_down(dev, proto_down); | |
6852 | } | |
6853 | EXPORT_SYMBOL(dev_change_proto_down); | |
6854 | ||
a7862b45 BB |
6855 | /** |
6856 | * dev_change_xdp_fd - set or clear a bpf program for a device rx path | |
6857 | * @dev: device | |
b5d60989 | 6858 | * @extack: netlink extended ack |
a7862b45 | 6859 | * @fd: new program fd or negative value to clear |
85de8576 | 6860 | * @flags: xdp-related flags |
a7862b45 BB |
6861 | * |
6862 | * Set or clear a bpf program for a device | |
6863 | */ | |
ddf9f970 JK |
6864 | int dev_change_xdp_fd(struct net_device *dev, struct netlink_ext_ack *extack, |
6865 | int fd, u32 flags) | |
a7862b45 | 6866 | { |
b5cdae32 | 6867 | int (*xdp_op)(struct net_device *dev, struct netdev_xdp *xdp); |
a7862b45 BB |
6868 | const struct net_device_ops *ops = dev->netdev_ops; |
6869 | struct bpf_prog *prog = NULL; | |
85de8576 | 6870 | struct netdev_xdp xdp; |
a7862b45 BB |
6871 | int err; |
6872 | ||
85de8576 DB |
6873 | ASSERT_RTNL(); |
6874 | ||
b5cdae32 DM |
6875 | xdp_op = ops->ndo_xdp; |
6876 | if (!xdp_op || (flags & XDP_FLAGS_SKB_MODE)) | |
6877 | xdp_op = generic_xdp_install; | |
6878 | ||
a7862b45 | 6879 | if (fd >= 0) { |
85de8576 DB |
6880 | if (flags & XDP_FLAGS_UPDATE_IF_NOEXIST) { |
6881 | memset(&xdp, 0, sizeof(xdp)); | |
6882 | xdp.command = XDP_QUERY_PROG; | |
6883 | ||
b5cdae32 | 6884 | err = xdp_op(dev, &xdp); |
85de8576 DB |
6885 | if (err < 0) |
6886 | return err; | |
6887 | if (xdp.prog_attached) | |
6888 | return -EBUSY; | |
6889 | } | |
6890 | ||
a7862b45 BB |
6891 | prog = bpf_prog_get_type(fd, BPF_PROG_TYPE_XDP); |
6892 | if (IS_ERR(prog)) | |
6893 | return PTR_ERR(prog); | |
6894 | } | |
6895 | ||
85de8576 | 6896 | memset(&xdp, 0, sizeof(xdp)); |
a7862b45 | 6897 | xdp.command = XDP_SETUP_PROG; |
ddf9f970 | 6898 | xdp.extack = extack; |
a7862b45 | 6899 | xdp.prog = prog; |
85de8576 | 6900 | |
b5cdae32 | 6901 | err = xdp_op(dev, &xdp); |
a7862b45 BB |
6902 | if (err < 0 && prog) |
6903 | bpf_prog_put(prog); | |
6904 | ||
6905 | return err; | |
6906 | } | |
a7862b45 | 6907 | |
1da177e4 LT |
6908 | /** |
6909 | * dev_new_index - allocate an ifindex | |
c4ea43c5 | 6910 | * @net: the applicable net namespace |
1da177e4 LT |
6911 | * |
6912 | * Returns a suitable unique value for a new device interface | |
6913 | * number. The caller must hold the rtnl semaphore or the | |
6914 | * dev_base_lock to be sure it remains unique. | |
6915 | */ | |
881d966b | 6916 | static int dev_new_index(struct net *net) |
1da177e4 | 6917 | { |
aa79e66e | 6918 | int ifindex = net->ifindex; |
f4563a75 | 6919 | |
1da177e4 LT |
6920 | for (;;) { |
6921 | if (++ifindex <= 0) | |
6922 | ifindex = 1; | |
881d966b | 6923 | if (!__dev_get_by_index(net, ifindex)) |
aa79e66e | 6924 | return net->ifindex = ifindex; |
1da177e4 LT |
6925 | } |
6926 | } | |
6927 | ||
1da177e4 | 6928 | /* Delayed registration/unregisteration */ |
3b5b34fd | 6929 | static LIST_HEAD(net_todo_list); |
200b916f | 6930 | DECLARE_WAIT_QUEUE_HEAD(netdev_unregistering_wq); |
1da177e4 | 6931 | |
6f05f629 | 6932 | static void net_set_todo(struct net_device *dev) |
1da177e4 | 6933 | { |
1da177e4 | 6934 | list_add_tail(&dev->todo_list, &net_todo_list); |
50624c93 | 6935 | dev_net(dev)->dev_unreg_count++; |
1da177e4 LT |
6936 | } |
6937 | ||
9b5e383c | 6938 | static void rollback_registered_many(struct list_head *head) |
93ee31f1 | 6939 | { |
e93737b0 | 6940 | struct net_device *dev, *tmp; |
5cde2829 | 6941 | LIST_HEAD(close_head); |
9b5e383c | 6942 | |
93ee31f1 DL |
6943 | BUG_ON(dev_boot_phase); |
6944 | ASSERT_RTNL(); | |
6945 | ||
e93737b0 | 6946 | list_for_each_entry_safe(dev, tmp, head, unreg_list) { |
9b5e383c | 6947 | /* Some devices call without registering |
e93737b0 KK |
6948 | * for initialization unwind. Remove those |
6949 | * devices and proceed with the remaining. | |
9b5e383c ED |
6950 | */ |
6951 | if (dev->reg_state == NETREG_UNINITIALIZED) { | |
7b6cd1ce JP |
6952 | pr_debug("unregister_netdevice: device %s/%p never was registered\n", |
6953 | dev->name, dev); | |
93ee31f1 | 6954 | |
9b5e383c | 6955 | WARN_ON(1); |
e93737b0 KK |
6956 | list_del(&dev->unreg_list); |
6957 | continue; | |
9b5e383c | 6958 | } |
449f4544 | 6959 | dev->dismantle = true; |
9b5e383c | 6960 | BUG_ON(dev->reg_state != NETREG_REGISTERED); |
44345724 | 6961 | } |
93ee31f1 | 6962 | |
44345724 | 6963 | /* If device is running, close it first. */ |
5cde2829 EB |
6964 | list_for_each_entry(dev, head, unreg_list) |
6965 | list_add_tail(&dev->close_list, &close_head); | |
99c4a26a | 6966 | dev_close_many(&close_head, true); |
93ee31f1 | 6967 | |
44345724 | 6968 | list_for_each_entry(dev, head, unreg_list) { |
9b5e383c ED |
6969 | /* And unlink it from device chain. */ |
6970 | unlist_netdevice(dev); | |
93ee31f1 | 6971 | |
9b5e383c ED |
6972 | dev->reg_state = NETREG_UNREGISTERING; |
6973 | } | |
41852497 | 6974 | flush_all_backlogs(); |
93ee31f1 DL |
6975 | |
6976 | synchronize_net(); | |
6977 | ||
9b5e383c | 6978 | list_for_each_entry(dev, head, unreg_list) { |
395eea6c MB |
6979 | struct sk_buff *skb = NULL; |
6980 | ||
9b5e383c ED |
6981 | /* Shutdown queueing discipline. */ |
6982 | dev_shutdown(dev); | |
93ee31f1 DL |
6983 | |
6984 | ||
9b5e383c | 6985 | /* Notify protocols, that we are about to destroy |
eb13da1a | 6986 | * this device. They should clean all the things. |
6987 | */ | |
9b5e383c | 6988 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); |
93ee31f1 | 6989 | |
395eea6c MB |
6990 | if (!dev->rtnl_link_ops || |
6991 | dev->rtnl_link_state == RTNL_LINK_INITIALIZED) | |
6992 | skb = rtmsg_ifinfo_build_skb(RTM_DELLINK, dev, ~0U, | |
6993 | GFP_KERNEL); | |
6994 | ||
9b5e383c ED |
6995 | /* |
6996 | * Flush the unicast and multicast chains | |
6997 | */ | |
a748ee24 | 6998 | dev_uc_flush(dev); |
22bedad3 | 6999 | dev_mc_flush(dev); |
93ee31f1 | 7000 | |
9b5e383c ED |
7001 | if (dev->netdev_ops->ndo_uninit) |
7002 | dev->netdev_ops->ndo_uninit(dev); | |
93ee31f1 | 7003 | |
395eea6c MB |
7004 | if (skb) |
7005 | rtmsg_ifinfo_send(skb, dev, GFP_KERNEL); | |
56bfa7ee | 7006 | |
9ff162a8 JP |
7007 | /* Notifier chain MUST detach us all upper devices. */ |
7008 | WARN_ON(netdev_has_any_upper_dev(dev)); | |
0f524a80 | 7009 | WARN_ON(netdev_has_any_lower_dev(dev)); |
93ee31f1 | 7010 | |
9b5e383c ED |
7011 | /* Remove entries from kobject tree */ |
7012 | netdev_unregister_kobject(dev); | |
024e9679 AD |
7013 | #ifdef CONFIG_XPS |
7014 | /* Remove XPS queueing entries */ | |
7015 | netif_reset_xps_queues_gt(dev, 0); | |
7016 | #endif | |
9b5e383c | 7017 | } |
93ee31f1 | 7018 | |
850a545b | 7019 | synchronize_net(); |
395264d5 | 7020 | |
a5ee1551 | 7021 | list_for_each_entry(dev, head, unreg_list) |
9b5e383c ED |
7022 | dev_put(dev); |
7023 | } | |
7024 | ||
7025 | static void rollback_registered(struct net_device *dev) | |
7026 | { | |
7027 | LIST_HEAD(single); | |
7028 | ||
7029 | list_add(&dev->unreg_list, &single); | |
7030 | rollback_registered_many(&single); | |
ceaaec98 | 7031 | list_del(&single); |
93ee31f1 DL |
7032 | } |
7033 | ||
fd867d51 JW |
7034 | static netdev_features_t netdev_sync_upper_features(struct net_device *lower, |
7035 | struct net_device *upper, netdev_features_t features) | |
7036 | { | |
7037 | netdev_features_t upper_disables = NETIF_F_UPPER_DISABLES; | |
7038 | netdev_features_t feature; | |
5ba3f7d6 | 7039 | int feature_bit; |
fd867d51 | 7040 | |
5ba3f7d6 JW |
7041 | for_each_netdev_feature(&upper_disables, feature_bit) { |
7042 | feature = __NETIF_F_BIT(feature_bit); | |
fd867d51 JW |
7043 | if (!(upper->wanted_features & feature) |
7044 | && (features & feature)) { | |
7045 | netdev_dbg(lower, "Dropping feature %pNF, upper dev %s has it off.\n", | |
7046 | &feature, upper->name); | |
7047 | features &= ~feature; | |
7048 | } | |
7049 | } | |
7050 | ||
7051 | return features; | |
7052 | } | |
7053 | ||
7054 | static void netdev_sync_lower_features(struct net_device *upper, | |
7055 | struct net_device *lower, netdev_features_t features) | |
7056 | { | |
7057 | netdev_features_t upper_disables = NETIF_F_UPPER_DISABLES; | |
7058 | netdev_features_t feature; | |
5ba3f7d6 | 7059 | int feature_bit; |
fd867d51 | 7060 | |
5ba3f7d6 JW |
7061 | for_each_netdev_feature(&upper_disables, feature_bit) { |
7062 | feature = __NETIF_F_BIT(feature_bit); | |
fd867d51 JW |
7063 | if (!(features & feature) && (lower->features & feature)) { |
7064 | netdev_dbg(upper, "Disabling feature %pNF on lower dev %s.\n", | |
7065 | &feature, lower->name); | |
7066 | lower->wanted_features &= ~feature; | |
7067 | netdev_update_features(lower); | |
7068 | ||
7069 | if (unlikely(lower->features & feature)) | |
7070 | netdev_WARN(upper, "failed to disable %pNF on %s!\n", | |
7071 | &feature, lower->name); | |
7072 | } | |
7073 | } | |
7074 | } | |
7075 | ||
c8f44aff MM |
7076 | static netdev_features_t netdev_fix_features(struct net_device *dev, |
7077 | netdev_features_t features) | |
b63365a2 | 7078 | { |
57422dc5 MM |
7079 | /* Fix illegal checksum combinations */ |
7080 | if ((features & NETIF_F_HW_CSUM) && | |
7081 | (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) { | |
6f404e44 | 7082 | netdev_warn(dev, "mixed HW and IP checksum settings.\n"); |
57422dc5 MM |
7083 | features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM); |
7084 | } | |
7085 | ||
b63365a2 | 7086 | /* TSO requires that SG is present as well. */ |
ea2d3688 | 7087 | if ((features & NETIF_F_ALL_TSO) && !(features & NETIF_F_SG)) { |
6f404e44 | 7088 | netdev_dbg(dev, "Dropping TSO features since no SG feature.\n"); |
ea2d3688 | 7089 | features &= ~NETIF_F_ALL_TSO; |
b63365a2 HX |
7090 | } |
7091 | ||
ec5f0615 PS |
7092 | if ((features & NETIF_F_TSO) && !(features & NETIF_F_HW_CSUM) && |
7093 | !(features & NETIF_F_IP_CSUM)) { | |
7094 | netdev_dbg(dev, "Dropping TSO features since no CSUM feature.\n"); | |
7095 | features &= ~NETIF_F_TSO; | |
7096 | features &= ~NETIF_F_TSO_ECN; | |
7097 | } | |
7098 | ||
7099 | if ((features & NETIF_F_TSO6) && !(features & NETIF_F_HW_CSUM) && | |
7100 | !(features & NETIF_F_IPV6_CSUM)) { | |
7101 | netdev_dbg(dev, "Dropping TSO6 features since no CSUM feature.\n"); | |
7102 | features &= ~NETIF_F_TSO6; | |
7103 | } | |
7104 | ||
b1dc497b AD |
7105 | /* TSO with IPv4 ID mangling requires IPv4 TSO be enabled */ |
7106 | if ((features & NETIF_F_TSO_MANGLEID) && !(features & NETIF_F_TSO)) | |
7107 | features &= ~NETIF_F_TSO_MANGLEID; | |
7108 | ||
31d8b9e0 BH |
7109 | /* TSO ECN requires that TSO is present as well. */ |
7110 | if ((features & NETIF_F_ALL_TSO) == NETIF_F_TSO_ECN) | |
7111 | features &= ~NETIF_F_TSO_ECN; | |
7112 | ||
212b573f MM |
7113 | /* Software GSO depends on SG. */ |
7114 | if ((features & NETIF_F_GSO) && !(features & NETIF_F_SG)) { | |
6f404e44 | 7115 | netdev_dbg(dev, "Dropping NETIF_F_GSO since no SG feature.\n"); |
212b573f MM |
7116 | features &= ~NETIF_F_GSO; |
7117 | } | |
7118 | ||
acd1130e | 7119 | /* UFO needs SG and checksumming */ |
b63365a2 | 7120 | if (features & NETIF_F_UFO) { |
79032644 | 7121 | /* maybe split UFO into V4 and V6? */ |
c8cd0989 TH |
7122 | if (!(features & NETIF_F_HW_CSUM) && |
7123 | ((features & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM)) != | |
7124 | (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM))) { | |
6f404e44 | 7125 | netdev_dbg(dev, |
acd1130e | 7126 | "Dropping NETIF_F_UFO since no checksum offload features.\n"); |
b63365a2 HX |
7127 | features &= ~NETIF_F_UFO; |
7128 | } | |
7129 | ||
7130 | if (!(features & NETIF_F_SG)) { | |
6f404e44 | 7131 | netdev_dbg(dev, |
acd1130e | 7132 | "Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n"); |
b63365a2 HX |
7133 | features &= ~NETIF_F_UFO; |
7134 | } | |
7135 | } | |
7136 | ||
802ab55a AD |
7137 | /* GSO partial features require GSO partial be set */ |
7138 | if ((features & dev->gso_partial_features) && | |
7139 | !(features & NETIF_F_GSO_PARTIAL)) { | |
7140 | netdev_dbg(dev, | |
7141 | "Dropping partially supported GSO features since no GSO partial.\n"); | |
7142 | features &= ~dev->gso_partial_features; | |
7143 | } | |
7144 | ||
b63365a2 HX |
7145 | return features; |
7146 | } | |
b63365a2 | 7147 | |
6cb6a27c | 7148 | int __netdev_update_features(struct net_device *dev) |
5455c699 | 7149 | { |
fd867d51 | 7150 | struct net_device *upper, *lower; |
c8f44aff | 7151 | netdev_features_t features; |
fd867d51 | 7152 | struct list_head *iter; |
e7868a85 | 7153 | int err = -1; |
5455c699 | 7154 | |
87267485 MM |
7155 | ASSERT_RTNL(); |
7156 | ||
5455c699 MM |
7157 | features = netdev_get_wanted_features(dev); |
7158 | ||
7159 | if (dev->netdev_ops->ndo_fix_features) | |
7160 | features = dev->netdev_ops->ndo_fix_features(dev, features); | |
7161 | ||
7162 | /* driver might be less strict about feature dependencies */ | |
7163 | features = netdev_fix_features(dev, features); | |
7164 | ||
fd867d51 JW |
7165 | /* some features can't be enabled if they're off an an upper device */ |
7166 | netdev_for_each_upper_dev_rcu(dev, upper, iter) | |
7167 | features = netdev_sync_upper_features(dev, upper, features); | |
7168 | ||
5455c699 | 7169 | if (dev->features == features) |
e7868a85 | 7170 | goto sync_lower; |
5455c699 | 7171 | |
c8f44aff MM |
7172 | netdev_dbg(dev, "Features changed: %pNF -> %pNF\n", |
7173 | &dev->features, &features); | |
5455c699 MM |
7174 | |
7175 | if (dev->netdev_ops->ndo_set_features) | |
7176 | err = dev->netdev_ops->ndo_set_features(dev, features); | |
5f8dc33e NA |
7177 | else |
7178 | err = 0; | |
5455c699 | 7179 | |
6cb6a27c | 7180 | if (unlikely(err < 0)) { |
5455c699 | 7181 | netdev_err(dev, |
c8f44aff MM |
7182 | "set_features() failed (%d); wanted %pNF, left %pNF\n", |
7183 | err, &features, &dev->features); | |
17b85d29 NA |
7184 | /* return non-0 since some features might have changed and |
7185 | * it's better to fire a spurious notification than miss it | |
7186 | */ | |
7187 | return -1; | |
6cb6a27c MM |
7188 | } |
7189 | ||
e7868a85 | 7190 | sync_lower: |
fd867d51 JW |
7191 | /* some features must be disabled on lower devices when disabled |
7192 | * on an upper device (think: bonding master or bridge) | |
7193 | */ | |
7194 | netdev_for_each_lower_dev(dev, lower, iter) | |
7195 | netdev_sync_lower_features(dev, lower, features); | |
7196 | ||
6cb6a27c MM |
7197 | if (!err) |
7198 | dev->features = features; | |
7199 | ||
e7868a85 | 7200 | return err < 0 ? 0 : 1; |
6cb6a27c MM |
7201 | } |
7202 | ||
afe12cc8 MM |
7203 | /** |
7204 | * netdev_update_features - recalculate device features | |
7205 | * @dev: the device to check | |
7206 | * | |
7207 | * Recalculate dev->features set and send notifications if it | |
7208 | * has changed. Should be called after driver or hardware dependent | |
7209 | * conditions might have changed that influence the features. | |
7210 | */ | |
6cb6a27c MM |
7211 | void netdev_update_features(struct net_device *dev) |
7212 | { | |
7213 | if (__netdev_update_features(dev)) | |
7214 | netdev_features_change(dev); | |
5455c699 MM |
7215 | } |
7216 | EXPORT_SYMBOL(netdev_update_features); | |
7217 | ||
afe12cc8 MM |
7218 | /** |
7219 | * netdev_change_features - recalculate device features | |
7220 | * @dev: the device to check | |
7221 | * | |
7222 | * Recalculate dev->features set and send notifications even | |
7223 | * if they have not changed. Should be called instead of | |
7224 | * netdev_update_features() if also dev->vlan_features might | |
7225 | * have changed to allow the changes to be propagated to stacked | |
7226 | * VLAN devices. | |
7227 | */ | |
7228 | void netdev_change_features(struct net_device *dev) | |
7229 | { | |
7230 | __netdev_update_features(dev); | |
7231 | netdev_features_change(dev); | |
7232 | } | |
7233 | EXPORT_SYMBOL(netdev_change_features); | |
7234 | ||
fc4a7489 PM |
7235 | /** |
7236 | * netif_stacked_transfer_operstate - transfer operstate | |
7237 | * @rootdev: the root or lower level device to transfer state from | |
7238 | * @dev: the device to transfer operstate to | |
7239 | * | |
7240 | * Transfer operational state from root to device. This is normally | |
7241 | * called when a stacking relationship exists between the root | |
7242 | * device and the device(a leaf device). | |
7243 | */ | |
7244 | void netif_stacked_transfer_operstate(const struct net_device *rootdev, | |
7245 | struct net_device *dev) | |
7246 | { | |
7247 | if (rootdev->operstate == IF_OPER_DORMANT) | |
7248 | netif_dormant_on(dev); | |
7249 | else | |
7250 | netif_dormant_off(dev); | |
7251 | ||
0575c86b ZS |
7252 | if (netif_carrier_ok(rootdev)) |
7253 | netif_carrier_on(dev); | |
7254 | else | |
7255 | netif_carrier_off(dev); | |
fc4a7489 PM |
7256 | } |
7257 | EXPORT_SYMBOL(netif_stacked_transfer_operstate); | |
7258 | ||
a953be53 | 7259 | #ifdef CONFIG_SYSFS |
1b4bf461 ED |
7260 | static int netif_alloc_rx_queues(struct net_device *dev) |
7261 | { | |
1b4bf461 | 7262 | unsigned int i, count = dev->num_rx_queues; |
bd25fa7b | 7263 | struct netdev_rx_queue *rx; |
10595902 | 7264 | size_t sz = count * sizeof(*rx); |
1b4bf461 | 7265 | |
bd25fa7b | 7266 | BUG_ON(count < 1); |
1b4bf461 | 7267 | |
da6bc57a MH |
7268 | rx = kvzalloc(sz, GFP_KERNEL | __GFP_REPEAT); |
7269 | if (!rx) | |
7270 | return -ENOMEM; | |
7271 | ||
bd25fa7b TH |
7272 | dev->_rx = rx; |
7273 | ||
bd25fa7b | 7274 | for (i = 0; i < count; i++) |
fe822240 | 7275 | rx[i].dev = dev; |
1b4bf461 ED |
7276 | return 0; |
7277 | } | |
bf264145 | 7278 | #endif |
1b4bf461 | 7279 | |
aa942104 CG |
7280 | static void netdev_init_one_queue(struct net_device *dev, |
7281 | struct netdev_queue *queue, void *_unused) | |
7282 | { | |
7283 | /* Initialize queue lock */ | |
7284 | spin_lock_init(&queue->_xmit_lock); | |
7285 | netdev_set_xmit_lockdep_class(&queue->_xmit_lock, dev->type); | |
7286 | queue->xmit_lock_owner = -1; | |
b236da69 | 7287 | netdev_queue_numa_node_write(queue, NUMA_NO_NODE); |
aa942104 | 7288 | queue->dev = dev; |
114cf580 TH |
7289 | #ifdef CONFIG_BQL |
7290 | dql_init(&queue->dql, HZ); | |
7291 | #endif | |
aa942104 CG |
7292 | } |
7293 | ||
60877a32 ED |
7294 | static void netif_free_tx_queues(struct net_device *dev) |
7295 | { | |
4cb28970 | 7296 | kvfree(dev->_tx); |
60877a32 ED |
7297 | } |
7298 | ||
e6484930 TH |
7299 | static int netif_alloc_netdev_queues(struct net_device *dev) |
7300 | { | |
7301 | unsigned int count = dev->num_tx_queues; | |
7302 | struct netdev_queue *tx; | |
60877a32 | 7303 | size_t sz = count * sizeof(*tx); |
e6484930 | 7304 | |
d339727c ED |
7305 | if (count < 1 || count > 0xffff) |
7306 | return -EINVAL; | |
62b5942a | 7307 | |
da6bc57a MH |
7308 | tx = kvzalloc(sz, GFP_KERNEL | __GFP_REPEAT); |
7309 | if (!tx) | |
7310 | return -ENOMEM; | |
7311 | ||
e6484930 | 7312 | dev->_tx = tx; |
1d24eb48 | 7313 | |
e6484930 TH |
7314 | netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL); |
7315 | spin_lock_init(&dev->tx_global_lock); | |
aa942104 CG |
7316 | |
7317 | return 0; | |
e6484930 TH |
7318 | } |
7319 | ||
a2029240 DV |
7320 | void netif_tx_stop_all_queues(struct net_device *dev) |
7321 | { | |
7322 | unsigned int i; | |
7323 | ||
7324 | for (i = 0; i < dev->num_tx_queues; i++) { | |
7325 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
f4563a75 | 7326 | |
a2029240 DV |
7327 | netif_tx_stop_queue(txq); |
7328 | } | |
7329 | } | |
7330 | EXPORT_SYMBOL(netif_tx_stop_all_queues); | |
7331 | ||
1da177e4 LT |
7332 | /** |
7333 | * register_netdevice - register a network device | |
7334 | * @dev: device to register | |
7335 | * | |
7336 | * Take a completed network device structure and add it to the kernel | |
7337 | * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier | |
7338 | * chain. 0 is returned on success. A negative errno code is returned | |
7339 | * on a failure to set up the device, or if the name is a duplicate. | |
7340 | * | |
7341 | * Callers must hold the rtnl semaphore. You may want | |
7342 | * register_netdev() instead of this. | |
7343 | * | |
7344 | * BUGS: | |
7345 | * The locking appears insufficient to guarantee two parallel registers | |
7346 | * will not get the same name. | |
7347 | */ | |
7348 | ||
7349 | int register_netdevice(struct net_device *dev) | |
7350 | { | |
1da177e4 | 7351 | int ret; |
d314774c | 7352 | struct net *net = dev_net(dev); |
1da177e4 LT |
7353 | |
7354 | BUG_ON(dev_boot_phase); | |
7355 | ASSERT_RTNL(); | |
7356 | ||
b17a7c17 SH |
7357 | might_sleep(); |
7358 | ||
1da177e4 LT |
7359 | /* When net_device's are persistent, this will be fatal. */ |
7360 | BUG_ON(dev->reg_state != NETREG_UNINITIALIZED); | |
d314774c | 7361 | BUG_ON(!net); |
1da177e4 | 7362 | |
f1f28aa3 | 7363 | spin_lock_init(&dev->addr_list_lock); |
cf508b12 | 7364 | netdev_set_addr_lockdep_class(dev); |
1da177e4 | 7365 | |
828de4f6 | 7366 | ret = dev_get_valid_name(net, dev, dev->name); |
0696c3a8 PP |
7367 | if (ret < 0) |
7368 | goto out; | |
7369 | ||
1da177e4 | 7370 | /* Init, if this function is available */ |
d314774c SH |
7371 | if (dev->netdev_ops->ndo_init) { |
7372 | ret = dev->netdev_ops->ndo_init(dev); | |
1da177e4 LT |
7373 | if (ret) { |
7374 | if (ret > 0) | |
7375 | ret = -EIO; | |
90833aa4 | 7376 | goto out; |
1da177e4 LT |
7377 | } |
7378 | } | |
4ec93edb | 7379 | |
f646968f PM |
7380 | if (((dev->hw_features | dev->features) & |
7381 | NETIF_F_HW_VLAN_CTAG_FILTER) && | |
d2ed273d MM |
7382 | (!dev->netdev_ops->ndo_vlan_rx_add_vid || |
7383 | !dev->netdev_ops->ndo_vlan_rx_kill_vid)) { | |
7384 | netdev_WARN(dev, "Buggy VLAN acceleration in driver!\n"); | |
7385 | ret = -EINVAL; | |
7386 | goto err_uninit; | |
7387 | } | |
7388 | ||
9c7dafbf PE |
7389 | ret = -EBUSY; |
7390 | if (!dev->ifindex) | |
7391 | dev->ifindex = dev_new_index(net); | |
7392 | else if (__dev_get_by_index(net, dev->ifindex)) | |
7393 | goto err_uninit; | |
7394 | ||
5455c699 MM |
7395 | /* Transfer changeable features to wanted_features and enable |
7396 | * software offloads (GSO and GRO). | |
7397 | */ | |
7398 | dev->hw_features |= NETIF_F_SOFT_FEATURES; | |
14d1232f MM |
7399 | dev->features |= NETIF_F_SOFT_FEATURES; |
7400 | dev->wanted_features = dev->features & dev->hw_features; | |
1da177e4 | 7401 | |
cbc53e08 | 7402 | if (!(dev->flags & IFF_LOOPBACK)) |
34324dc2 | 7403 | dev->hw_features |= NETIF_F_NOCACHE_COPY; |
cbc53e08 | 7404 | |
7f348a60 AD |
7405 | /* If IPv4 TCP segmentation offload is supported we should also |
7406 | * allow the device to enable segmenting the frame with the option | |
7407 | * of ignoring a static IP ID value. This doesn't enable the | |
7408 | * feature itself but allows the user to enable it later. | |
7409 | */ | |
cbc53e08 AD |
7410 | if (dev->hw_features & NETIF_F_TSO) |
7411 | dev->hw_features |= NETIF_F_TSO_MANGLEID; | |
7f348a60 AD |
7412 | if (dev->vlan_features & NETIF_F_TSO) |
7413 | dev->vlan_features |= NETIF_F_TSO_MANGLEID; | |
7414 | if (dev->mpls_features & NETIF_F_TSO) | |
7415 | dev->mpls_features |= NETIF_F_TSO_MANGLEID; | |
7416 | if (dev->hw_enc_features & NETIF_F_TSO) | |
7417 | dev->hw_enc_features |= NETIF_F_TSO_MANGLEID; | |
c6e1a0d1 | 7418 | |
1180e7d6 | 7419 | /* Make NETIF_F_HIGHDMA inheritable to VLAN devices. |
16c3ea78 | 7420 | */ |
1180e7d6 | 7421 | dev->vlan_features |= NETIF_F_HIGHDMA; |
16c3ea78 | 7422 | |
ee579677 PS |
7423 | /* Make NETIF_F_SG inheritable to tunnel devices. |
7424 | */ | |
802ab55a | 7425 | dev->hw_enc_features |= NETIF_F_SG | NETIF_F_GSO_PARTIAL; |
ee579677 | 7426 | |
0d89d203 SH |
7427 | /* Make NETIF_F_SG inheritable to MPLS. |
7428 | */ | |
7429 | dev->mpls_features |= NETIF_F_SG; | |
7430 | ||
7ffbe3fd JB |
7431 | ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev); |
7432 | ret = notifier_to_errno(ret); | |
7433 | if (ret) | |
7434 | goto err_uninit; | |
7435 | ||
8b41d188 | 7436 | ret = netdev_register_kobject(dev); |
b17a7c17 | 7437 | if (ret) |
7ce1b0ed | 7438 | goto err_uninit; |
b17a7c17 SH |
7439 | dev->reg_state = NETREG_REGISTERED; |
7440 | ||
6cb6a27c | 7441 | __netdev_update_features(dev); |
8e9b59b2 | 7442 | |
1da177e4 LT |
7443 | /* |
7444 | * Default initial state at registry is that the | |
7445 | * device is present. | |
7446 | */ | |
7447 | ||
7448 | set_bit(__LINK_STATE_PRESENT, &dev->state); | |
7449 | ||
8f4cccbb BH |
7450 | linkwatch_init_dev(dev); |
7451 | ||
1da177e4 | 7452 | dev_init_scheduler(dev); |
1da177e4 | 7453 | dev_hold(dev); |
ce286d32 | 7454 | list_netdevice(dev); |
7bf23575 | 7455 | add_device_randomness(dev->dev_addr, dev->addr_len); |
1da177e4 | 7456 | |
948b337e JP |
7457 | /* If the device has permanent device address, driver should |
7458 | * set dev_addr and also addr_assign_type should be set to | |
7459 | * NET_ADDR_PERM (default value). | |
7460 | */ | |
7461 | if (dev->addr_assign_type == NET_ADDR_PERM) | |
7462 | memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len); | |
7463 | ||
1da177e4 | 7464 | /* Notify protocols, that a new device appeared. */ |
056925ab | 7465 | ret = call_netdevice_notifiers(NETDEV_REGISTER, dev); |
fcc5a03a | 7466 | ret = notifier_to_errno(ret); |
93ee31f1 DL |
7467 | if (ret) { |
7468 | rollback_registered(dev); | |
7469 | dev->reg_state = NETREG_UNREGISTERED; | |
7470 | } | |
d90a909e EB |
7471 | /* |
7472 | * Prevent userspace races by waiting until the network | |
7473 | * device is fully setup before sending notifications. | |
7474 | */ | |
a2835763 PM |
7475 | if (!dev->rtnl_link_ops || |
7476 | dev->rtnl_link_state == RTNL_LINK_INITIALIZED) | |
7f294054 | 7477 | rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL); |
1da177e4 LT |
7478 | |
7479 | out: | |
7480 | return ret; | |
7ce1b0ed HX |
7481 | |
7482 | err_uninit: | |
d314774c SH |
7483 | if (dev->netdev_ops->ndo_uninit) |
7484 | dev->netdev_ops->ndo_uninit(dev); | |
7ce1b0ed | 7485 | goto out; |
1da177e4 | 7486 | } |
d1b19dff | 7487 | EXPORT_SYMBOL(register_netdevice); |
1da177e4 | 7488 | |
937f1ba5 BH |
7489 | /** |
7490 | * init_dummy_netdev - init a dummy network device for NAPI | |
7491 | * @dev: device to init | |
7492 | * | |
7493 | * This takes a network device structure and initialize the minimum | |
7494 | * amount of fields so it can be used to schedule NAPI polls without | |
7495 | * registering a full blown interface. This is to be used by drivers | |
7496 | * that need to tie several hardware interfaces to a single NAPI | |
7497 | * poll scheduler due to HW limitations. | |
7498 | */ | |
7499 | int init_dummy_netdev(struct net_device *dev) | |
7500 | { | |
7501 | /* Clear everything. Note we don't initialize spinlocks | |
7502 | * are they aren't supposed to be taken by any of the | |
7503 | * NAPI code and this dummy netdev is supposed to be | |
7504 | * only ever used for NAPI polls | |
7505 | */ | |
7506 | memset(dev, 0, sizeof(struct net_device)); | |
7507 | ||
7508 | /* make sure we BUG if trying to hit standard | |
7509 | * register/unregister code path | |
7510 | */ | |
7511 | dev->reg_state = NETREG_DUMMY; | |
7512 | ||
937f1ba5 BH |
7513 | /* NAPI wants this */ |
7514 | INIT_LIST_HEAD(&dev->napi_list); | |
7515 | ||
7516 | /* a dummy interface is started by default */ | |
7517 | set_bit(__LINK_STATE_PRESENT, &dev->state); | |
7518 | set_bit(__LINK_STATE_START, &dev->state); | |
7519 | ||
29b4433d ED |
7520 | /* Note : We dont allocate pcpu_refcnt for dummy devices, |
7521 | * because users of this 'device' dont need to change | |
7522 | * its refcount. | |
7523 | */ | |
7524 | ||
937f1ba5 BH |
7525 | return 0; |
7526 | } | |
7527 | EXPORT_SYMBOL_GPL(init_dummy_netdev); | |
7528 | ||
7529 | ||
1da177e4 LT |
7530 | /** |
7531 | * register_netdev - register a network device | |
7532 | * @dev: device to register | |
7533 | * | |
7534 | * Take a completed network device structure and add it to the kernel | |
7535 | * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier | |
7536 | * chain. 0 is returned on success. A negative errno code is returned | |
7537 | * on a failure to set up the device, or if the name is a duplicate. | |
7538 | * | |
38b4da38 | 7539 | * This is a wrapper around register_netdevice that takes the rtnl semaphore |
1da177e4 LT |
7540 | * and expands the device name if you passed a format string to |
7541 | * alloc_netdev. | |
7542 | */ | |
7543 | int register_netdev(struct net_device *dev) | |
7544 | { | |
7545 | int err; | |
7546 | ||
7547 | rtnl_lock(); | |
1da177e4 | 7548 | err = register_netdevice(dev); |
1da177e4 LT |
7549 | rtnl_unlock(); |
7550 | return err; | |
7551 | } | |
7552 | EXPORT_SYMBOL(register_netdev); | |
7553 | ||
29b4433d ED |
7554 | int netdev_refcnt_read(const struct net_device *dev) |
7555 | { | |
7556 | int i, refcnt = 0; | |
7557 | ||
7558 | for_each_possible_cpu(i) | |
7559 | refcnt += *per_cpu_ptr(dev->pcpu_refcnt, i); | |
7560 | return refcnt; | |
7561 | } | |
7562 | EXPORT_SYMBOL(netdev_refcnt_read); | |
7563 | ||
2c53040f | 7564 | /** |
1da177e4 | 7565 | * netdev_wait_allrefs - wait until all references are gone. |
3de7a37b | 7566 | * @dev: target net_device |
1da177e4 LT |
7567 | * |
7568 | * This is called when unregistering network devices. | |
7569 | * | |
7570 | * Any protocol or device that holds a reference should register | |
7571 | * for netdevice notification, and cleanup and put back the | |
7572 | * reference if they receive an UNREGISTER event. | |
7573 | * We can get stuck here if buggy protocols don't correctly | |
4ec93edb | 7574 | * call dev_put. |
1da177e4 LT |
7575 | */ |
7576 | static void netdev_wait_allrefs(struct net_device *dev) | |
7577 | { | |
7578 | unsigned long rebroadcast_time, warning_time; | |
29b4433d | 7579 | int refcnt; |
1da177e4 | 7580 | |
e014debe ED |
7581 | linkwatch_forget_dev(dev); |
7582 | ||
1da177e4 | 7583 | rebroadcast_time = warning_time = jiffies; |
29b4433d ED |
7584 | refcnt = netdev_refcnt_read(dev); |
7585 | ||
7586 | while (refcnt != 0) { | |
1da177e4 | 7587 | if (time_after(jiffies, rebroadcast_time + 1 * HZ)) { |
6756ae4b | 7588 | rtnl_lock(); |
1da177e4 LT |
7589 | |
7590 | /* Rebroadcast unregister notification */ | |
056925ab | 7591 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); |
1da177e4 | 7592 | |
748e2d93 | 7593 | __rtnl_unlock(); |
0115e8e3 | 7594 | rcu_barrier(); |
748e2d93 ED |
7595 | rtnl_lock(); |
7596 | ||
0115e8e3 | 7597 | call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev); |
1da177e4 LT |
7598 | if (test_bit(__LINK_STATE_LINKWATCH_PENDING, |
7599 | &dev->state)) { | |
7600 | /* We must not have linkwatch events | |
7601 | * pending on unregister. If this | |
7602 | * happens, we simply run the queue | |
7603 | * unscheduled, resulting in a noop | |
7604 | * for this device. | |
7605 | */ | |
7606 | linkwatch_run_queue(); | |
7607 | } | |
7608 | ||
6756ae4b | 7609 | __rtnl_unlock(); |
1da177e4 LT |
7610 | |
7611 | rebroadcast_time = jiffies; | |
7612 | } | |
7613 | ||
7614 | msleep(250); | |
7615 | ||
29b4433d ED |
7616 | refcnt = netdev_refcnt_read(dev); |
7617 | ||
1da177e4 | 7618 | if (time_after(jiffies, warning_time + 10 * HZ)) { |
7b6cd1ce JP |
7619 | pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n", |
7620 | dev->name, refcnt); | |
1da177e4 LT |
7621 | warning_time = jiffies; |
7622 | } | |
7623 | } | |
7624 | } | |
7625 | ||
7626 | /* The sequence is: | |
7627 | * | |
7628 | * rtnl_lock(); | |
7629 | * ... | |
7630 | * register_netdevice(x1); | |
7631 | * register_netdevice(x2); | |
7632 | * ... | |
7633 | * unregister_netdevice(y1); | |
7634 | * unregister_netdevice(y2); | |
7635 | * ... | |
7636 | * rtnl_unlock(); | |
7637 | * free_netdev(y1); | |
7638 | * free_netdev(y2); | |
7639 | * | |
58ec3b4d | 7640 | * We are invoked by rtnl_unlock(). |
1da177e4 | 7641 | * This allows us to deal with problems: |
b17a7c17 | 7642 | * 1) We can delete sysfs objects which invoke hotplug |
1da177e4 LT |
7643 | * without deadlocking with linkwatch via keventd. |
7644 | * 2) Since we run with the RTNL semaphore not held, we can sleep | |
7645 | * safely in order to wait for the netdev refcnt to drop to zero. | |
58ec3b4d HX |
7646 | * |
7647 | * We must not return until all unregister events added during | |
7648 | * the interval the lock was held have been completed. | |
1da177e4 | 7649 | */ |
1da177e4 LT |
7650 | void netdev_run_todo(void) |
7651 | { | |
626ab0e6 | 7652 | struct list_head list; |
1da177e4 | 7653 | |
1da177e4 | 7654 | /* Snapshot list, allow later requests */ |
626ab0e6 | 7655 | list_replace_init(&net_todo_list, &list); |
58ec3b4d HX |
7656 | |
7657 | __rtnl_unlock(); | |
626ab0e6 | 7658 | |
0115e8e3 ED |
7659 | |
7660 | /* Wait for rcu callbacks to finish before next phase */ | |
850a545b EB |
7661 | if (!list_empty(&list)) |
7662 | rcu_barrier(); | |
7663 | ||
1da177e4 LT |
7664 | while (!list_empty(&list)) { |
7665 | struct net_device *dev | |
e5e26d75 | 7666 | = list_first_entry(&list, struct net_device, todo_list); |
1da177e4 LT |
7667 | list_del(&dev->todo_list); |
7668 | ||
748e2d93 | 7669 | rtnl_lock(); |
0115e8e3 | 7670 | call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev); |
748e2d93 | 7671 | __rtnl_unlock(); |
0115e8e3 | 7672 | |
b17a7c17 | 7673 | if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) { |
7b6cd1ce | 7674 | pr_err("network todo '%s' but state %d\n", |
b17a7c17 SH |
7675 | dev->name, dev->reg_state); |
7676 | dump_stack(); | |
7677 | continue; | |
7678 | } | |
1da177e4 | 7679 | |
b17a7c17 | 7680 | dev->reg_state = NETREG_UNREGISTERED; |
1da177e4 | 7681 | |
b17a7c17 | 7682 | netdev_wait_allrefs(dev); |
1da177e4 | 7683 | |
b17a7c17 | 7684 | /* paranoia */ |
29b4433d | 7685 | BUG_ON(netdev_refcnt_read(dev)); |
7866a621 SN |
7686 | BUG_ON(!list_empty(&dev->ptype_all)); |
7687 | BUG_ON(!list_empty(&dev->ptype_specific)); | |
33d480ce ED |
7688 | WARN_ON(rcu_access_pointer(dev->ip_ptr)); |
7689 | WARN_ON(rcu_access_pointer(dev->ip6_ptr)); | |
547b792c | 7690 | WARN_ON(dev->dn_ptr); |
1da177e4 | 7691 | |
b17a7c17 SH |
7692 | if (dev->destructor) |
7693 | dev->destructor(dev); | |
9093bbb2 | 7694 | |
50624c93 EB |
7695 | /* Report a network device has been unregistered */ |
7696 | rtnl_lock(); | |
7697 | dev_net(dev)->dev_unreg_count--; | |
7698 | __rtnl_unlock(); | |
7699 | wake_up(&netdev_unregistering_wq); | |
7700 | ||
9093bbb2 SH |
7701 | /* Free network device */ |
7702 | kobject_put(&dev->dev.kobj); | |
1da177e4 | 7703 | } |
1da177e4 LT |
7704 | } |
7705 | ||
9256645a JW |
7706 | /* Convert net_device_stats to rtnl_link_stats64. rtnl_link_stats64 has |
7707 | * all the same fields in the same order as net_device_stats, with only | |
7708 | * the type differing, but rtnl_link_stats64 may have additional fields | |
7709 | * at the end for newer counters. | |
3cfde79c | 7710 | */ |
77a1abf5 ED |
7711 | void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64, |
7712 | const struct net_device_stats *netdev_stats) | |
3cfde79c BH |
7713 | { |
7714 | #if BITS_PER_LONG == 64 | |
9256645a | 7715 | BUILD_BUG_ON(sizeof(*stats64) < sizeof(*netdev_stats)); |
77a1abf5 | 7716 | memcpy(stats64, netdev_stats, sizeof(*stats64)); |
9256645a JW |
7717 | /* zero out counters that only exist in rtnl_link_stats64 */ |
7718 | memset((char *)stats64 + sizeof(*netdev_stats), 0, | |
7719 | sizeof(*stats64) - sizeof(*netdev_stats)); | |
3cfde79c | 7720 | #else |
9256645a | 7721 | size_t i, n = sizeof(*netdev_stats) / sizeof(unsigned long); |
3cfde79c BH |
7722 | const unsigned long *src = (const unsigned long *)netdev_stats; |
7723 | u64 *dst = (u64 *)stats64; | |
7724 | ||
9256645a | 7725 | BUILD_BUG_ON(n > sizeof(*stats64) / sizeof(u64)); |
3cfde79c BH |
7726 | for (i = 0; i < n; i++) |
7727 | dst[i] = src[i]; | |
9256645a JW |
7728 | /* zero out counters that only exist in rtnl_link_stats64 */ |
7729 | memset((char *)stats64 + n * sizeof(u64), 0, | |
7730 | sizeof(*stats64) - n * sizeof(u64)); | |
3cfde79c BH |
7731 | #endif |
7732 | } | |
77a1abf5 | 7733 | EXPORT_SYMBOL(netdev_stats_to_stats64); |
3cfde79c | 7734 | |
eeda3fd6 SH |
7735 | /** |
7736 | * dev_get_stats - get network device statistics | |
7737 | * @dev: device to get statistics from | |
28172739 | 7738 | * @storage: place to store stats |
eeda3fd6 | 7739 | * |
d7753516 BH |
7740 | * Get network statistics from device. Return @storage. |
7741 | * The device driver may provide its own method by setting | |
7742 | * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats; | |
7743 | * otherwise the internal statistics structure is used. | |
eeda3fd6 | 7744 | */ |
d7753516 BH |
7745 | struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev, |
7746 | struct rtnl_link_stats64 *storage) | |
7004bf25 | 7747 | { |
eeda3fd6 SH |
7748 | const struct net_device_ops *ops = dev->netdev_ops; |
7749 | ||
28172739 ED |
7750 | if (ops->ndo_get_stats64) { |
7751 | memset(storage, 0, sizeof(*storage)); | |
caf586e5 ED |
7752 | ops->ndo_get_stats64(dev, storage); |
7753 | } else if (ops->ndo_get_stats) { | |
3cfde79c | 7754 | netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev)); |
caf586e5 ED |
7755 | } else { |
7756 | netdev_stats_to_stats64(storage, &dev->stats); | |
28172739 | 7757 | } |
caf586e5 | 7758 | storage->rx_dropped += atomic_long_read(&dev->rx_dropped); |
015f0688 | 7759 | storage->tx_dropped += atomic_long_read(&dev->tx_dropped); |
6e7333d3 | 7760 | storage->rx_nohandler += atomic_long_read(&dev->rx_nohandler); |
28172739 | 7761 | return storage; |
c45d286e | 7762 | } |
eeda3fd6 | 7763 | EXPORT_SYMBOL(dev_get_stats); |
c45d286e | 7764 | |
24824a09 | 7765 | struct netdev_queue *dev_ingress_queue_create(struct net_device *dev) |
dc2b4847 | 7766 | { |
24824a09 | 7767 | struct netdev_queue *queue = dev_ingress_queue(dev); |
dc2b4847 | 7768 | |
24824a09 ED |
7769 | #ifdef CONFIG_NET_CLS_ACT |
7770 | if (queue) | |
7771 | return queue; | |
7772 | queue = kzalloc(sizeof(*queue), GFP_KERNEL); | |
7773 | if (!queue) | |
7774 | return NULL; | |
7775 | netdev_init_one_queue(dev, queue, NULL); | |
2ce1ee17 | 7776 | RCU_INIT_POINTER(queue->qdisc, &noop_qdisc); |
24824a09 ED |
7777 | queue->qdisc_sleeping = &noop_qdisc; |
7778 | rcu_assign_pointer(dev->ingress_queue, queue); | |
7779 | #endif | |
7780 | return queue; | |
bb949fbd DM |
7781 | } |
7782 | ||
2c60db03 ED |
7783 | static const struct ethtool_ops default_ethtool_ops; |
7784 | ||
d07d7507 SG |
7785 | void netdev_set_default_ethtool_ops(struct net_device *dev, |
7786 | const struct ethtool_ops *ops) | |
7787 | { | |
7788 | if (dev->ethtool_ops == &default_ethtool_ops) | |
7789 | dev->ethtool_ops = ops; | |
7790 | } | |
7791 | EXPORT_SYMBOL_GPL(netdev_set_default_ethtool_ops); | |
7792 | ||
74d332c1 ED |
7793 | void netdev_freemem(struct net_device *dev) |
7794 | { | |
7795 | char *addr = (char *)dev - dev->padded; | |
7796 | ||
4cb28970 | 7797 | kvfree(addr); |
74d332c1 ED |
7798 | } |
7799 | ||
1da177e4 | 7800 | /** |
722c9a0c | 7801 | * alloc_netdev_mqs - allocate network device |
7802 | * @sizeof_priv: size of private data to allocate space for | |
7803 | * @name: device name format string | |
7804 | * @name_assign_type: origin of device name | |
7805 | * @setup: callback to initialize device | |
7806 | * @txqs: the number of TX subqueues to allocate | |
7807 | * @rxqs: the number of RX subqueues to allocate | |
7808 | * | |
7809 | * Allocates a struct net_device with private data area for driver use | |
7810 | * and performs basic initialization. Also allocates subqueue structs | |
7811 | * for each queue on the device. | |
1da177e4 | 7812 | */ |
36909ea4 | 7813 | struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name, |
c835a677 | 7814 | unsigned char name_assign_type, |
36909ea4 TH |
7815 | void (*setup)(struct net_device *), |
7816 | unsigned int txqs, unsigned int rxqs) | |
1da177e4 | 7817 | { |
1da177e4 | 7818 | struct net_device *dev; |
7943986c | 7819 | size_t alloc_size; |
1ce8e7b5 | 7820 | struct net_device *p; |
1da177e4 | 7821 | |
b6fe17d6 SH |
7822 | BUG_ON(strlen(name) >= sizeof(dev->name)); |
7823 | ||
36909ea4 | 7824 | if (txqs < 1) { |
7b6cd1ce | 7825 | pr_err("alloc_netdev: Unable to allocate device with zero queues\n"); |
55513fb4 TH |
7826 | return NULL; |
7827 | } | |
7828 | ||
a953be53 | 7829 | #ifdef CONFIG_SYSFS |
36909ea4 | 7830 | if (rxqs < 1) { |
7b6cd1ce | 7831 | pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n"); |
36909ea4 TH |
7832 | return NULL; |
7833 | } | |
7834 | #endif | |
7835 | ||
fd2ea0a7 | 7836 | alloc_size = sizeof(struct net_device); |
d1643d24 AD |
7837 | if (sizeof_priv) { |
7838 | /* ensure 32-byte alignment of private area */ | |
1ce8e7b5 | 7839 | alloc_size = ALIGN(alloc_size, NETDEV_ALIGN); |
d1643d24 AD |
7840 | alloc_size += sizeof_priv; |
7841 | } | |
7842 | /* ensure 32-byte alignment of whole construct */ | |
1ce8e7b5 | 7843 | alloc_size += NETDEV_ALIGN - 1; |
1da177e4 | 7844 | |
da6bc57a | 7845 | p = kvzalloc(alloc_size, GFP_KERNEL | __GFP_REPEAT); |
62b5942a | 7846 | if (!p) |
1da177e4 | 7847 | return NULL; |
1da177e4 | 7848 | |
1ce8e7b5 | 7849 | dev = PTR_ALIGN(p, NETDEV_ALIGN); |
1da177e4 | 7850 | dev->padded = (char *)dev - (char *)p; |
ab9c73cc | 7851 | |
29b4433d ED |
7852 | dev->pcpu_refcnt = alloc_percpu(int); |
7853 | if (!dev->pcpu_refcnt) | |
74d332c1 | 7854 | goto free_dev; |
ab9c73cc | 7855 | |
ab9c73cc | 7856 | if (dev_addr_init(dev)) |
29b4433d | 7857 | goto free_pcpu; |
ab9c73cc | 7858 | |
22bedad3 | 7859 | dev_mc_init(dev); |
a748ee24 | 7860 | dev_uc_init(dev); |
ccffad25 | 7861 | |
c346dca1 | 7862 | dev_net_set(dev, &init_net); |
1da177e4 | 7863 | |
8d3bdbd5 | 7864 | dev->gso_max_size = GSO_MAX_SIZE; |
30b678d8 | 7865 | dev->gso_max_segs = GSO_MAX_SEGS; |
8d3bdbd5 | 7866 | |
8d3bdbd5 DM |
7867 | INIT_LIST_HEAD(&dev->napi_list); |
7868 | INIT_LIST_HEAD(&dev->unreg_list); | |
5cde2829 | 7869 | INIT_LIST_HEAD(&dev->close_list); |
8d3bdbd5 | 7870 | INIT_LIST_HEAD(&dev->link_watch_list); |
2f268f12 VF |
7871 | INIT_LIST_HEAD(&dev->adj_list.upper); |
7872 | INIT_LIST_HEAD(&dev->adj_list.lower); | |
7866a621 SN |
7873 | INIT_LIST_HEAD(&dev->ptype_all); |
7874 | INIT_LIST_HEAD(&dev->ptype_specific); | |
59cc1f61 JK |
7875 | #ifdef CONFIG_NET_SCHED |
7876 | hash_init(dev->qdisc_hash); | |
7877 | #endif | |
02875878 | 7878 | dev->priv_flags = IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM; |
8d3bdbd5 DM |
7879 | setup(dev); |
7880 | ||
a813104d | 7881 | if (!dev->tx_queue_len) { |
f84bb1ea | 7882 | dev->priv_flags |= IFF_NO_QUEUE; |
11597084 | 7883 | dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN; |
a813104d | 7884 | } |
906470c1 | 7885 | |
36909ea4 TH |
7886 | dev->num_tx_queues = txqs; |
7887 | dev->real_num_tx_queues = txqs; | |
ed9af2e8 | 7888 | if (netif_alloc_netdev_queues(dev)) |
8d3bdbd5 | 7889 | goto free_all; |
e8a0464c | 7890 | |
a953be53 | 7891 | #ifdef CONFIG_SYSFS |
36909ea4 TH |
7892 | dev->num_rx_queues = rxqs; |
7893 | dev->real_num_rx_queues = rxqs; | |
fe822240 | 7894 | if (netif_alloc_rx_queues(dev)) |
8d3bdbd5 | 7895 | goto free_all; |
df334545 | 7896 | #endif |
0a9627f2 | 7897 | |
1da177e4 | 7898 | strcpy(dev->name, name); |
c835a677 | 7899 | dev->name_assign_type = name_assign_type; |
cbda10fa | 7900 | dev->group = INIT_NETDEV_GROUP; |
2c60db03 ED |
7901 | if (!dev->ethtool_ops) |
7902 | dev->ethtool_ops = &default_ethtool_ops; | |
e687ad60 PN |
7903 | |
7904 | nf_hook_ingress_init(dev); | |
7905 | ||
1da177e4 | 7906 | return dev; |
ab9c73cc | 7907 | |
8d3bdbd5 DM |
7908 | free_all: |
7909 | free_netdev(dev); | |
7910 | return NULL; | |
7911 | ||
29b4433d ED |
7912 | free_pcpu: |
7913 | free_percpu(dev->pcpu_refcnt); | |
74d332c1 ED |
7914 | free_dev: |
7915 | netdev_freemem(dev); | |
ab9c73cc | 7916 | return NULL; |
1da177e4 | 7917 | } |
36909ea4 | 7918 | EXPORT_SYMBOL(alloc_netdev_mqs); |
1da177e4 LT |
7919 | |
7920 | /** | |
722c9a0c | 7921 | * free_netdev - free network device |
7922 | * @dev: device | |
1da177e4 | 7923 | * |
722c9a0c | 7924 | * This function does the last stage of destroying an allocated device |
7925 | * interface. The reference to the device object is released. If this | |
7926 | * is the last reference then it will be freed.Must be called in process | |
7927 | * context. | |
1da177e4 LT |
7928 | */ |
7929 | void free_netdev(struct net_device *dev) | |
7930 | { | |
d565b0a1 | 7931 | struct napi_struct *p, *n; |
b5cdae32 | 7932 | struct bpf_prog *prog; |
d565b0a1 | 7933 | |
93d05d4a | 7934 | might_sleep(); |
60877a32 | 7935 | netif_free_tx_queues(dev); |
a953be53 | 7936 | #ifdef CONFIG_SYSFS |
10595902 | 7937 | kvfree(dev->_rx); |
fe822240 | 7938 | #endif |
e8a0464c | 7939 | |
33d480ce | 7940 | kfree(rcu_dereference_protected(dev->ingress_queue, 1)); |
24824a09 | 7941 | |
f001fde5 JP |
7942 | /* Flush device addresses */ |
7943 | dev_addr_flush(dev); | |
7944 | ||
d565b0a1 HX |
7945 | list_for_each_entry_safe(p, n, &dev->napi_list, dev_list) |
7946 | netif_napi_del(p); | |
7947 | ||
29b4433d ED |
7948 | free_percpu(dev->pcpu_refcnt); |
7949 | dev->pcpu_refcnt = NULL; | |
7950 | ||
b5cdae32 DM |
7951 | prog = rcu_dereference_protected(dev->xdp_prog, 1); |
7952 | if (prog) { | |
7953 | bpf_prog_put(prog); | |
7954 | static_key_slow_dec(&generic_xdp_needed); | |
7955 | } | |
7956 | ||
3041a069 | 7957 | /* Compatibility with error handling in drivers */ |
1da177e4 | 7958 | if (dev->reg_state == NETREG_UNINITIALIZED) { |
74d332c1 | 7959 | netdev_freemem(dev); |
1da177e4 LT |
7960 | return; |
7961 | } | |
7962 | ||
7963 | BUG_ON(dev->reg_state != NETREG_UNREGISTERED); | |
7964 | dev->reg_state = NETREG_RELEASED; | |
7965 | ||
43cb76d9 GKH |
7966 | /* will free via device release */ |
7967 | put_device(&dev->dev); | |
1da177e4 | 7968 | } |
d1b19dff | 7969 | EXPORT_SYMBOL(free_netdev); |
4ec93edb | 7970 | |
f0db275a SH |
7971 | /** |
7972 | * synchronize_net - Synchronize with packet receive processing | |
7973 | * | |
7974 | * Wait for packets currently being received to be done. | |
7975 | * Does not block later packets from starting. | |
7976 | */ | |
4ec93edb | 7977 | void synchronize_net(void) |
1da177e4 LT |
7978 | { |
7979 | might_sleep(); | |
be3fc413 ED |
7980 | if (rtnl_is_locked()) |
7981 | synchronize_rcu_expedited(); | |
7982 | else | |
7983 | synchronize_rcu(); | |
1da177e4 | 7984 | } |
d1b19dff | 7985 | EXPORT_SYMBOL(synchronize_net); |
1da177e4 LT |
7986 | |
7987 | /** | |
44a0873d | 7988 | * unregister_netdevice_queue - remove device from the kernel |
1da177e4 | 7989 | * @dev: device |
44a0873d | 7990 | * @head: list |
6ebfbc06 | 7991 | * |
1da177e4 | 7992 | * This function shuts down a device interface and removes it |
d59b54b1 | 7993 | * from the kernel tables. |
44a0873d | 7994 | * If head not NULL, device is queued to be unregistered later. |
1da177e4 LT |
7995 | * |
7996 | * Callers must hold the rtnl semaphore. You may want | |
7997 | * unregister_netdev() instead of this. | |
7998 | */ | |
7999 | ||
44a0873d | 8000 | void unregister_netdevice_queue(struct net_device *dev, struct list_head *head) |
1da177e4 | 8001 | { |
a6620712 HX |
8002 | ASSERT_RTNL(); |
8003 | ||
44a0873d | 8004 | if (head) { |
9fdce099 | 8005 | list_move_tail(&dev->unreg_list, head); |
44a0873d ED |
8006 | } else { |
8007 | rollback_registered(dev); | |
8008 | /* Finish processing unregister after unlock */ | |
8009 | net_set_todo(dev); | |
8010 | } | |
1da177e4 | 8011 | } |
44a0873d | 8012 | EXPORT_SYMBOL(unregister_netdevice_queue); |
1da177e4 | 8013 | |
9b5e383c ED |
8014 | /** |
8015 | * unregister_netdevice_many - unregister many devices | |
8016 | * @head: list of devices | |
87757a91 ED |
8017 | * |
8018 | * Note: As most callers use a stack allocated list_head, | |
8019 | * we force a list_del() to make sure stack wont be corrupted later. | |
9b5e383c ED |
8020 | */ |
8021 | void unregister_netdevice_many(struct list_head *head) | |
8022 | { | |
8023 | struct net_device *dev; | |
8024 | ||
8025 | if (!list_empty(head)) { | |
8026 | rollback_registered_many(head); | |
8027 | list_for_each_entry(dev, head, unreg_list) | |
8028 | net_set_todo(dev); | |
87757a91 | 8029 | list_del(head); |
9b5e383c ED |
8030 | } |
8031 | } | |
63c8099d | 8032 | EXPORT_SYMBOL(unregister_netdevice_many); |
9b5e383c | 8033 | |
1da177e4 LT |
8034 | /** |
8035 | * unregister_netdev - remove device from the kernel | |
8036 | * @dev: device | |
8037 | * | |
8038 | * This function shuts down a device interface and removes it | |
d59b54b1 | 8039 | * from the kernel tables. |
1da177e4 LT |
8040 | * |
8041 | * This is just a wrapper for unregister_netdevice that takes | |
8042 | * the rtnl semaphore. In general you want to use this and not | |
8043 | * unregister_netdevice. | |
8044 | */ | |
8045 | void unregister_netdev(struct net_device *dev) | |
8046 | { | |
8047 | rtnl_lock(); | |
8048 | unregister_netdevice(dev); | |
8049 | rtnl_unlock(); | |
8050 | } | |
1da177e4 LT |
8051 | EXPORT_SYMBOL(unregister_netdev); |
8052 | ||
ce286d32 EB |
8053 | /** |
8054 | * dev_change_net_namespace - move device to different nethost namespace | |
8055 | * @dev: device | |
8056 | * @net: network namespace | |
8057 | * @pat: If not NULL name pattern to try if the current device name | |
8058 | * is already taken in the destination network namespace. | |
8059 | * | |
8060 | * This function shuts down a device interface and moves it | |
8061 | * to a new network namespace. On success 0 is returned, on | |
8062 | * a failure a netagive errno code is returned. | |
8063 | * | |
8064 | * Callers must hold the rtnl semaphore. | |
8065 | */ | |
8066 | ||
8067 | int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat) | |
8068 | { | |
ce286d32 EB |
8069 | int err; |
8070 | ||
8071 | ASSERT_RTNL(); | |
8072 | ||
8073 | /* Don't allow namespace local devices to be moved. */ | |
8074 | err = -EINVAL; | |
8075 | if (dev->features & NETIF_F_NETNS_LOCAL) | |
8076 | goto out; | |
8077 | ||
8078 | /* Ensure the device has been registrered */ | |
ce286d32 EB |
8079 | if (dev->reg_state != NETREG_REGISTERED) |
8080 | goto out; | |
8081 | ||
8082 | /* Get out if there is nothing todo */ | |
8083 | err = 0; | |
878628fb | 8084 | if (net_eq(dev_net(dev), net)) |
ce286d32 EB |
8085 | goto out; |
8086 | ||
8087 | /* Pick the destination device name, and ensure | |
8088 | * we can use it in the destination network namespace. | |
8089 | */ | |
8090 | err = -EEXIST; | |
d9031024 | 8091 | if (__dev_get_by_name(net, dev->name)) { |
ce286d32 EB |
8092 | /* We get here if we can't use the current device name */ |
8093 | if (!pat) | |
8094 | goto out; | |
828de4f6 | 8095 | if (dev_get_valid_name(net, dev, pat) < 0) |
ce286d32 EB |
8096 | goto out; |
8097 | } | |
8098 | ||
8099 | /* | |
8100 | * And now a mini version of register_netdevice unregister_netdevice. | |
8101 | */ | |
8102 | ||
8103 | /* If device is running close it first. */ | |
9b772652 | 8104 | dev_close(dev); |
ce286d32 EB |
8105 | |
8106 | /* And unlink it from device chain */ | |
8107 | err = -ENODEV; | |
8108 | unlist_netdevice(dev); | |
8109 | ||
8110 | synchronize_net(); | |
8111 | ||
8112 | /* Shutdown queueing discipline. */ | |
8113 | dev_shutdown(dev); | |
8114 | ||
8115 | /* Notify protocols, that we are about to destroy | |
eb13da1a | 8116 | * this device. They should clean all the things. |
8117 | * | |
8118 | * Note that dev->reg_state stays at NETREG_REGISTERED. | |
8119 | * This is wanted because this way 8021q and macvlan know | |
8120 | * the device is just moving and can keep their slaves up. | |
8121 | */ | |
ce286d32 | 8122 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); |
6549dd43 G |
8123 | rcu_barrier(); |
8124 | call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev); | |
7f294054 | 8125 | rtmsg_ifinfo(RTM_DELLINK, dev, ~0U, GFP_KERNEL); |
ce286d32 EB |
8126 | |
8127 | /* | |
8128 | * Flush the unicast and multicast chains | |
8129 | */ | |
a748ee24 | 8130 | dev_uc_flush(dev); |
22bedad3 | 8131 | dev_mc_flush(dev); |
ce286d32 | 8132 | |
4e66ae2e SH |
8133 | /* Send a netdev-removed uevent to the old namespace */ |
8134 | kobject_uevent(&dev->dev.kobj, KOBJ_REMOVE); | |
4c75431a | 8135 | netdev_adjacent_del_links(dev); |
4e66ae2e | 8136 | |
ce286d32 | 8137 | /* Actually switch the network namespace */ |
c346dca1 | 8138 | dev_net_set(dev, net); |
ce286d32 | 8139 | |
ce286d32 | 8140 | /* If there is an ifindex conflict assign a new one */ |
7a66bbc9 | 8141 | if (__dev_get_by_index(net, dev->ifindex)) |
ce286d32 | 8142 | dev->ifindex = dev_new_index(net); |
ce286d32 | 8143 | |
4e66ae2e SH |
8144 | /* Send a netdev-add uevent to the new namespace */ |
8145 | kobject_uevent(&dev->dev.kobj, KOBJ_ADD); | |
4c75431a | 8146 | netdev_adjacent_add_links(dev); |
4e66ae2e | 8147 | |
8b41d188 | 8148 | /* Fixup kobjects */ |
a1b3f594 | 8149 | err = device_rename(&dev->dev, dev->name); |
8b41d188 | 8150 | WARN_ON(err); |
ce286d32 EB |
8151 | |
8152 | /* Add the device back in the hashes */ | |
8153 | list_netdevice(dev); | |
8154 | ||
8155 | /* Notify protocols, that a new device appeared. */ | |
8156 | call_netdevice_notifiers(NETDEV_REGISTER, dev); | |
8157 | ||
d90a909e EB |
8158 | /* |
8159 | * Prevent userspace races by waiting until the network | |
8160 | * device is fully setup before sending notifications. | |
8161 | */ | |
7f294054 | 8162 | rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL); |
d90a909e | 8163 | |
ce286d32 EB |
8164 | synchronize_net(); |
8165 | err = 0; | |
8166 | out: | |
8167 | return err; | |
8168 | } | |
463d0183 | 8169 | EXPORT_SYMBOL_GPL(dev_change_net_namespace); |
ce286d32 | 8170 | |
f0bf90de | 8171 | static int dev_cpu_dead(unsigned int oldcpu) |
1da177e4 LT |
8172 | { |
8173 | struct sk_buff **list_skb; | |
1da177e4 | 8174 | struct sk_buff *skb; |
f0bf90de | 8175 | unsigned int cpu; |
1da177e4 LT |
8176 | struct softnet_data *sd, *oldsd; |
8177 | ||
1da177e4 LT |
8178 | local_irq_disable(); |
8179 | cpu = smp_processor_id(); | |
8180 | sd = &per_cpu(softnet_data, cpu); | |
8181 | oldsd = &per_cpu(softnet_data, oldcpu); | |
8182 | ||
8183 | /* Find end of our completion_queue. */ | |
8184 | list_skb = &sd->completion_queue; | |
8185 | while (*list_skb) | |
8186 | list_skb = &(*list_skb)->next; | |
8187 | /* Append completion queue from offline CPU. */ | |
8188 | *list_skb = oldsd->completion_queue; | |
8189 | oldsd->completion_queue = NULL; | |
8190 | ||
1da177e4 | 8191 | /* Append output queue from offline CPU. */ |
a9cbd588 CG |
8192 | if (oldsd->output_queue) { |
8193 | *sd->output_queue_tailp = oldsd->output_queue; | |
8194 | sd->output_queue_tailp = oldsd->output_queue_tailp; | |
8195 | oldsd->output_queue = NULL; | |
8196 | oldsd->output_queue_tailp = &oldsd->output_queue; | |
8197 | } | |
ac64da0b ED |
8198 | /* Append NAPI poll list from offline CPU, with one exception : |
8199 | * process_backlog() must be called by cpu owning percpu backlog. | |
8200 | * We properly handle process_queue & input_pkt_queue later. | |
8201 | */ | |
8202 | while (!list_empty(&oldsd->poll_list)) { | |
8203 | struct napi_struct *napi = list_first_entry(&oldsd->poll_list, | |
8204 | struct napi_struct, | |
8205 | poll_list); | |
8206 | ||
8207 | list_del_init(&napi->poll_list); | |
8208 | if (napi->poll == process_backlog) | |
8209 | napi->state = 0; | |
8210 | else | |
8211 | ____napi_schedule(sd, napi); | |
264524d5 | 8212 | } |
1da177e4 LT |
8213 | |
8214 | raise_softirq_irqoff(NET_TX_SOFTIRQ); | |
8215 | local_irq_enable(); | |
8216 | ||
8217 | /* Process offline CPU's input_pkt_queue */ | |
76cc8b13 | 8218 | while ((skb = __skb_dequeue(&oldsd->process_queue))) { |
91e83133 | 8219 | netif_rx_ni(skb); |
76cc8b13 | 8220 | input_queue_head_incr(oldsd); |
fec5e652 | 8221 | } |
ac64da0b | 8222 | while ((skb = skb_dequeue(&oldsd->input_pkt_queue))) { |
91e83133 | 8223 | netif_rx_ni(skb); |
76cc8b13 TH |
8224 | input_queue_head_incr(oldsd); |
8225 | } | |
1da177e4 | 8226 | |
f0bf90de | 8227 | return 0; |
1da177e4 | 8228 | } |
1da177e4 | 8229 | |
7f353bf2 | 8230 | /** |
b63365a2 HX |
8231 | * netdev_increment_features - increment feature set by one |
8232 | * @all: current feature set | |
8233 | * @one: new feature set | |
8234 | * @mask: mask feature set | |
7f353bf2 HX |
8235 | * |
8236 | * Computes a new feature set after adding a device with feature set | |
b63365a2 HX |
8237 | * @one to the master device with current feature set @all. Will not |
8238 | * enable anything that is off in @mask. Returns the new feature set. | |
7f353bf2 | 8239 | */ |
c8f44aff MM |
8240 | netdev_features_t netdev_increment_features(netdev_features_t all, |
8241 | netdev_features_t one, netdev_features_t mask) | |
b63365a2 | 8242 | { |
c8cd0989 | 8243 | if (mask & NETIF_F_HW_CSUM) |
a188222b | 8244 | mask |= NETIF_F_CSUM_MASK; |
1742f183 | 8245 | mask |= NETIF_F_VLAN_CHALLENGED; |
7f353bf2 | 8246 | |
a188222b | 8247 | all |= one & (NETIF_F_ONE_FOR_ALL | NETIF_F_CSUM_MASK) & mask; |
1742f183 | 8248 | all &= one | ~NETIF_F_ALL_FOR_ALL; |
c6e1a0d1 | 8249 | |
1742f183 | 8250 | /* If one device supports hw checksumming, set for all. */ |
c8cd0989 TH |
8251 | if (all & NETIF_F_HW_CSUM) |
8252 | all &= ~(NETIF_F_CSUM_MASK & ~NETIF_F_HW_CSUM); | |
7f353bf2 HX |
8253 | |
8254 | return all; | |
8255 | } | |
b63365a2 | 8256 | EXPORT_SYMBOL(netdev_increment_features); |
7f353bf2 | 8257 | |
430f03cd | 8258 | static struct hlist_head * __net_init netdev_create_hash(void) |
30d97d35 PE |
8259 | { |
8260 | int i; | |
8261 | struct hlist_head *hash; | |
8262 | ||
8263 | hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL); | |
8264 | if (hash != NULL) | |
8265 | for (i = 0; i < NETDEV_HASHENTRIES; i++) | |
8266 | INIT_HLIST_HEAD(&hash[i]); | |
8267 | ||
8268 | return hash; | |
8269 | } | |
8270 | ||
881d966b | 8271 | /* Initialize per network namespace state */ |
4665079c | 8272 | static int __net_init netdev_init(struct net *net) |
881d966b | 8273 | { |
734b6541 RM |
8274 | if (net != &init_net) |
8275 | INIT_LIST_HEAD(&net->dev_base_head); | |
881d966b | 8276 | |
30d97d35 PE |
8277 | net->dev_name_head = netdev_create_hash(); |
8278 | if (net->dev_name_head == NULL) | |
8279 | goto err_name; | |
881d966b | 8280 | |
30d97d35 PE |
8281 | net->dev_index_head = netdev_create_hash(); |
8282 | if (net->dev_index_head == NULL) | |
8283 | goto err_idx; | |
881d966b EB |
8284 | |
8285 | return 0; | |
30d97d35 PE |
8286 | |
8287 | err_idx: | |
8288 | kfree(net->dev_name_head); | |
8289 | err_name: | |
8290 | return -ENOMEM; | |
881d966b EB |
8291 | } |
8292 | ||
f0db275a SH |
8293 | /** |
8294 | * netdev_drivername - network driver for the device | |
8295 | * @dev: network device | |
f0db275a SH |
8296 | * |
8297 | * Determine network driver for device. | |
8298 | */ | |
3019de12 | 8299 | const char *netdev_drivername(const struct net_device *dev) |
6579e57b | 8300 | { |
cf04a4c7 SH |
8301 | const struct device_driver *driver; |
8302 | const struct device *parent; | |
3019de12 | 8303 | const char *empty = ""; |
6579e57b AV |
8304 | |
8305 | parent = dev->dev.parent; | |
6579e57b | 8306 | if (!parent) |
3019de12 | 8307 | return empty; |
6579e57b AV |
8308 | |
8309 | driver = parent->driver; | |
8310 | if (driver && driver->name) | |
3019de12 DM |
8311 | return driver->name; |
8312 | return empty; | |
6579e57b AV |
8313 | } |
8314 | ||
6ea754eb JP |
8315 | static void __netdev_printk(const char *level, const struct net_device *dev, |
8316 | struct va_format *vaf) | |
256df2f3 | 8317 | { |
b004ff49 | 8318 | if (dev && dev->dev.parent) { |
6ea754eb JP |
8319 | dev_printk_emit(level[1] - '0', |
8320 | dev->dev.parent, | |
8321 | "%s %s %s%s: %pV", | |
8322 | dev_driver_string(dev->dev.parent), | |
8323 | dev_name(dev->dev.parent), | |
8324 | netdev_name(dev), netdev_reg_state(dev), | |
8325 | vaf); | |
b004ff49 | 8326 | } else if (dev) { |
6ea754eb JP |
8327 | printk("%s%s%s: %pV", |
8328 | level, netdev_name(dev), netdev_reg_state(dev), vaf); | |
b004ff49 | 8329 | } else { |
6ea754eb | 8330 | printk("%s(NULL net_device): %pV", level, vaf); |
b004ff49 | 8331 | } |
256df2f3 JP |
8332 | } |
8333 | ||
6ea754eb JP |
8334 | void netdev_printk(const char *level, const struct net_device *dev, |
8335 | const char *format, ...) | |
256df2f3 JP |
8336 | { |
8337 | struct va_format vaf; | |
8338 | va_list args; | |
256df2f3 JP |
8339 | |
8340 | va_start(args, format); | |
8341 | ||
8342 | vaf.fmt = format; | |
8343 | vaf.va = &args; | |
8344 | ||
6ea754eb | 8345 | __netdev_printk(level, dev, &vaf); |
b004ff49 | 8346 | |
256df2f3 | 8347 | va_end(args); |
256df2f3 JP |
8348 | } |
8349 | EXPORT_SYMBOL(netdev_printk); | |
8350 | ||
8351 | #define define_netdev_printk_level(func, level) \ | |
6ea754eb | 8352 | void func(const struct net_device *dev, const char *fmt, ...) \ |
256df2f3 | 8353 | { \ |
256df2f3 JP |
8354 | struct va_format vaf; \ |
8355 | va_list args; \ | |
8356 | \ | |
8357 | va_start(args, fmt); \ | |
8358 | \ | |
8359 | vaf.fmt = fmt; \ | |
8360 | vaf.va = &args; \ | |
8361 | \ | |
6ea754eb | 8362 | __netdev_printk(level, dev, &vaf); \ |
b004ff49 | 8363 | \ |
256df2f3 | 8364 | va_end(args); \ |
256df2f3 JP |
8365 | } \ |
8366 | EXPORT_SYMBOL(func); | |
8367 | ||
8368 | define_netdev_printk_level(netdev_emerg, KERN_EMERG); | |
8369 | define_netdev_printk_level(netdev_alert, KERN_ALERT); | |
8370 | define_netdev_printk_level(netdev_crit, KERN_CRIT); | |
8371 | define_netdev_printk_level(netdev_err, KERN_ERR); | |
8372 | define_netdev_printk_level(netdev_warn, KERN_WARNING); | |
8373 | define_netdev_printk_level(netdev_notice, KERN_NOTICE); | |
8374 | define_netdev_printk_level(netdev_info, KERN_INFO); | |
8375 | ||
4665079c | 8376 | static void __net_exit netdev_exit(struct net *net) |
881d966b EB |
8377 | { |
8378 | kfree(net->dev_name_head); | |
8379 | kfree(net->dev_index_head); | |
8380 | } | |
8381 | ||
022cbae6 | 8382 | static struct pernet_operations __net_initdata netdev_net_ops = { |
881d966b EB |
8383 | .init = netdev_init, |
8384 | .exit = netdev_exit, | |
8385 | }; | |
8386 | ||
4665079c | 8387 | static void __net_exit default_device_exit(struct net *net) |
ce286d32 | 8388 | { |
e008b5fc | 8389 | struct net_device *dev, *aux; |
ce286d32 | 8390 | /* |
e008b5fc | 8391 | * Push all migratable network devices back to the |
ce286d32 EB |
8392 | * initial network namespace |
8393 | */ | |
8394 | rtnl_lock(); | |
e008b5fc | 8395 | for_each_netdev_safe(net, dev, aux) { |
ce286d32 | 8396 | int err; |
aca51397 | 8397 | char fb_name[IFNAMSIZ]; |
ce286d32 EB |
8398 | |
8399 | /* Ignore unmoveable devices (i.e. loopback) */ | |
8400 | if (dev->features & NETIF_F_NETNS_LOCAL) | |
8401 | continue; | |
8402 | ||
e008b5fc EB |
8403 | /* Leave virtual devices for the generic cleanup */ |
8404 | if (dev->rtnl_link_ops) | |
8405 | continue; | |
d0c082ce | 8406 | |
25985edc | 8407 | /* Push remaining network devices to init_net */ |
aca51397 PE |
8408 | snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex); |
8409 | err = dev_change_net_namespace(dev, &init_net, fb_name); | |
ce286d32 | 8410 | if (err) { |
7b6cd1ce JP |
8411 | pr_emerg("%s: failed to move %s to init_net: %d\n", |
8412 | __func__, dev->name, err); | |
aca51397 | 8413 | BUG(); |
ce286d32 EB |
8414 | } |
8415 | } | |
8416 | rtnl_unlock(); | |
8417 | } | |
8418 | ||
50624c93 EB |
8419 | static void __net_exit rtnl_lock_unregistering(struct list_head *net_list) |
8420 | { | |
8421 | /* Return with the rtnl_lock held when there are no network | |
8422 | * devices unregistering in any network namespace in net_list. | |
8423 | */ | |
8424 | struct net *net; | |
8425 | bool unregistering; | |
ff960a73 | 8426 | DEFINE_WAIT_FUNC(wait, woken_wake_function); |
50624c93 | 8427 | |
ff960a73 | 8428 | add_wait_queue(&netdev_unregistering_wq, &wait); |
50624c93 | 8429 | for (;;) { |
50624c93 EB |
8430 | unregistering = false; |
8431 | rtnl_lock(); | |
8432 | list_for_each_entry(net, net_list, exit_list) { | |
8433 | if (net->dev_unreg_count > 0) { | |
8434 | unregistering = true; | |
8435 | break; | |
8436 | } | |
8437 | } | |
8438 | if (!unregistering) | |
8439 | break; | |
8440 | __rtnl_unlock(); | |
ff960a73 PZ |
8441 | |
8442 | wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT); | |
50624c93 | 8443 | } |
ff960a73 | 8444 | remove_wait_queue(&netdev_unregistering_wq, &wait); |
50624c93 EB |
8445 | } |
8446 | ||
04dc7f6b EB |
8447 | static void __net_exit default_device_exit_batch(struct list_head *net_list) |
8448 | { | |
8449 | /* At exit all network devices most be removed from a network | |
b595076a | 8450 | * namespace. Do this in the reverse order of registration. |
04dc7f6b EB |
8451 | * Do this across as many network namespaces as possible to |
8452 | * improve batching efficiency. | |
8453 | */ | |
8454 | struct net_device *dev; | |
8455 | struct net *net; | |
8456 | LIST_HEAD(dev_kill_list); | |
8457 | ||
50624c93 EB |
8458 | /* To prevent network device cleanup code from dereferencing |
8459 | * loopback devices or network devices that have been freed | |
8460 | * wait here for all pending unregistrations to complete, | |
8461 | * before unregistring the loopback device and allowing the | |
8462 | * network namespace be freed. | |
8463 | * | |
8464 | * The netdev todo list containing all network devices | |
8465 | * unregistrations that happen in default_device_exit_batch | |
8466 | * will run in the rtnl_unlock() at the end of | |
8467 | * default_device_exit_batch. | |
8468 | */ | |
8469 | rtnl_lock_unregistering(net_list); | |
04dc7f6b EB |
8470 | list_for_each_entry(net, net_list, exit_list) { |
8471 | for_each_netdev_reverse(net, dev) { | |
b0ab2fab | 8472 | if (dev->rtnl_link_ops && dev->rtnl_link_ops->dellink) |
04dc7f6b EB |
8473 | dev->rtnl_link_ops->dellink(dev, &dev_kill_list); |
8474 | else | |
8475 | unregister_netdevice_queue(dev, &dev_kill_list); | |
8476 | } | |
8477 | } | |
8478 | unregister_netdevice_many(&dev_kill_list); | |
8479 | rtnl_unlock(); | |
8480 | } | |
8481 | ||
022cbae6 | 8482 | static struct pernet_operations __net_initdata default_device_ops = { |
ce286d32 | 8483 | .exit = default_device_exit, |
04dc7f6b | 8484 | .exit_batch = default_device_exit_batch, |
ce286d32 EB |
8485 | }; |
8486 | ||
1da177e4 LT |
8487 | /* |
8488 | * Initialize the DEV module. At boot time this walks the device list and | |
8489 | * unhooks any devices that fail to initialise (normally hardware not | |
8490 | * present) and leaves us with a valid list of present and active devices. | |
8491 | * | |
8492 | */ | |
8493 | ||
8494 | /* | |
8495 | * This is called single threaded during boot, so no need | |
8496 | * to take the rtnl semaphore. | |
8497 | */ | |
8498 | static int __init net_dev_init(void) | |
8499 | { | |
8500 | int i, rc = -ENOMEM; | |
8501 | ||
8502 | BUG_ON(!dev_boot_phase); | |
8503 | ||
1da177e4 LT |
8504 | if (dev_proc_init()) |
8505 | goto out; | |
8506 | ||
8b41d188 | 8507 | if (netdev_kobject_init()) |
1da177e4 LT |
8508 | goto out; |
8509 | ||
8510 | INIT_LIST_HEAD(&ptype_all); | |
82d8a867 | 8511 | for (i = 0; i < PTYPE_HASH_SIZE; i++) |
1da177e4 LT |
8512 | INIT_LIST_HEAD(&ptype_base[i]); |
8513 | ||
62532da9 VY |
8514 | INIT_LIST_HEAD(&offload_base); |
8515 | ||
881d966b EB |
8516 | if (register_pernet_subsys(&netdev_net_ops)) |
8517 | goto out; | |
1da177e4 LT |
8518 | |
8519 | /* | |
8520 | * Initialise the packet receive queues. | |
8521 | */ | |
8522 | ||
6f912042 | 8523 | for_each_possible_cpu(i) { |
41852497 | 8524 | struct work_struct *flush = per_cpu_ptr(&flush_works, i); |
e36fa2f7 | 8525 | struct softnet_data *sd = &per_cpu(softnet_data, i); |
1da177e4 | 8526 | |
41852497 ED |
8527 | INIT_WORK(flush, flush_backlog); |
8528 | ||
e36fa2f7 | 8529 | skb_queue_head_init(&sd->input_pkt_queue); |
6e7676c1 | 8530 | skb_queue_head_init(&sd->process_queue); |
e36fa2f7 | 8531 | INIT_LIST_HEAD(&sd->poll_list); |
a9cbd588 | 8532 | sd->output_queue_tailp = &sd->output_queue; |
df334545 | 8533 | #ifdef CONFIG_RPS |
e36fa2f7 ED |
8534 | sd->csd.func = rps_trigger_softirq; |
8535 | sd->csd.info = sd; | |
e36fa2f7 | 8536 | sd->cpu = i; |
1e94d72f | 8537 | #endif |
0a9627f2 | 8538 | |
e36fa2f7 ED |
8539 | sd->backlog.poll = process_backlog; |
8540 | sd->backlog.weight = weight_p; | |
1da177e4 LT |
8541 | } |
8542 | ||
1da177e4 LT |
8543 | dev_boot_phase = 0; |
8544 | ||
505d4f73 EB |
8545 | /* The loopback device is special if any other network devices |
8546 | * is present in a network namespace the loopback device must | |
8547 | * be present. Since we now dynamically allocate and free the | |
8548 | * loopback device ensure this invariant is maintained by | |
8549 | * keeping the loopback device as the first device on the | |
8550 | * list of network devices. Ensuring the loopback devices | |
8551 | * is the first device that appears and the last network device | |
8552 | * that disappears. | |
8553 | */ | |
8554 | if (register_pernet_device(&loopback_net_ops)) | |
8555 | goto out; | |
8556 | ||
8557 | if (register_pernet_device(&default_device_ops)) | |
8558 | goto out; | |
8559 | ||
962cf36c CM |
8560 | open_softirq(NET_TX_SOFTIRQ, net_tx_action); |
8561 | open_softirq(NET_RX_SOFTIRQ, net_rx_action); | |
1da177e4 | 8562 | |
f0bf90de SAS |
8563 | rc = cpuhp_setup_state_nocalls(CPUHP_NET_DEV_DEAD, "net/dev:dead", |
8564 | NULL, dev_cpu_dead); | |
8565 | WARN_ON(rc < 0); | |
f38a9eb1 | 8566 | dst_subsys_init(); |
1da177e4 LT |
8567 | rc = 0; |
8568 | out: | |
8569 | return rc; | |
8570 | } | |
8571 | ||
8572 | subsys_initcall(net_dev_init); |