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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * NET3 Protocol independent device support routines. | |
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 | |
02c30a84 | 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 | |
24 | * to 2 if register_netdev gets called | |
25 | * before net_dev_init & also removed a | |
26 | * few lines of code in the process. | |
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. | |
39 | * Alan Cox : Fix ETH_P_ALL echoback lengths. | |
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. | |
49 | * Alan Cox : Fixed nasty side effect of device close | |
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 | |
70 | * indefinitely on dev->refcnt | |
71 | * J Hadi Salim : - Backlog queue sampling | |
72 | * - netif_rx() feedback | |
73 | */ | |
74 | ||
75 | #include <asm/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> |
4a3e2f71 | 84 | #include <linux/mutex.h> |
1da177e4 LT |
85 | #include <linux/string.h> |
86 | #include <linux/mm.h> | |
87 | #include <linux/socket.h> | |
88 | #include <linux/sockios.h> | |
89 | #include <linux/errno.h> | |
90 | #include <linux/interrupt.h> | |
91 | #include <linux/if_ether.h> | |
92 | #include <linux/netdevice.h> | |
93 | #include <linux/etherdevice.h> | |
0187bdfb | 94 | #include <linux/ethtool.h> |
1da177e4 LT |
95 | #include <linux/notifier.h> |
96 | #include <linux/skbuff.h> | |
457c4cbc | 97 | #include <net/net_namespace.h> |
1da177e4 LT |
98 | #include <net/sock.h> |
99 | #include <linux/rtnetlink.h> | |
1da177e4 | 100 | #include <linux/stat.h> |
1da177e4 LT |
101 | #include <net/dst.h> |
102 | #include <net/pkt_sched.h> | |
103 | #include <net/checksum.h> | |
44540960 | 104 | #include <net/xfrm.h> |
1da177e4 LT |
105 | #include <linux/highmem.h> |
106 | #include <linux/init.h> | |
1da177e4 | 107 | #include <linux/module.h> |
1da177e4 LT |
108 | #include <linux/netpoll.h> |
109 | #include <linux/rcupdate.h> | |
110 | #include <linux/delay.h> | |
1da177e4 | 111 | #include <net/iw_handler.h> |
1da177e4 | 112 | #include <asm/current.h> |
5bdb9886 | 113 | #include <linux/audit.h> |
db217334 | 114 | #include <linux/dmaengine.h> |
f6a78bfc | 115 | #include <linux/err.h> |
c7fa9d18 | 116 | #include <linux/ctype.h> |
723e98b7 | 117 | #include <linux/if_arp.h> |
6de329e2 | 118 | #include <linux/if_vlan.h> |
8f0f2223 | 119 | #include <linux/ip.h> |
ad55dcaf | 120 | #include <net/ip.h> |
8f0f2223 DM |
121 | #include <linux/ipv6.h> |
122 | #include <linux/in.h> | |
b6b2fed1 DM |
123 | #include <linux/jhash.h> |
124 | #include <linux/random.h> | |
9cbc1cb8 | 125 | #include <trace/events/napi.h> |
cf66ba58 | 126 | #include <trace/events/net.h> |
07dc22e7 | 127 | #include <trace/events/skb.h> |
5acbbd42 | 128 | #include <linux/pci.h> |
caeda9b9 | 129 | #include <linux/inetdevice.h> |
c445477d | 130 | #include <linux/cpu_rmap.h> |
c5905afb | 131 | #include <linux/static_key.h> |
af12fa6e | 132 | #include <linux/hashtable.h> |
60877a32 | 133 | #include <linux/vmalloc.h> |
529d0489 | 134 | #include <linux/if_macvlan.h> |
1da177e4 | 135 | |
342709ef PE |
136 | #include "net-sysfs.h" |
137 | ||
d565b0a1 HX |
138 | /* Instead of increasing this, you should create a hash table. */ |
139 | #define MAX_GRO_SKBS 8 | |
140 | ||
5d38a079 HX |
141 | /* This should be increased if a protocol with a bigger head is added. */ |
142 | #define GRO_MAX_HEAD (MAX_HEADER + 128) | |
143 | ||
1da177e4 | 144 | static DEFINE_SPINLOCK(ptype_lock); |
62532da9 | 145 | static DEFINE_SPINLOCK(offload_lock); |
900ff8c6 CW |
146 | struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly; |
147 | struct list_head ptype_all __read_mostly; /* Taps */ | |
62532da9 | 148 | static struct list_head offload_base __read_mostly; |
1da177e4 | 149 | |
1da177e4 | 150 | /* |
7562f876 | 151 | * The @dev_base_head list is protected by @dev_base_lock and the rtnl |
1da177e4 LT |
152 | * semaphore. |
153 | * | |
c6d14c84 | 154 | * Pure readers hold dev_base_lock for reading, or rcu_read_lock() |
1da177e4 LT |
155 | * |
156 | * Writers must hold the rtnl semaphore while they loop through the | |
7562f876 | 157 | * dev_base_head list, and hold dev_base_lock for writing when they do the |
1da177e4 LT |
158 | * actual updates. This allows pure readers to access the list even |
159 | * while a writer is preparing to update it. | |
160 | * | |
161 | * To put it another way, dev_base_lock is held for writing only to | |
162 | * protect against pure readers; the rtnl semaphore provides the | |
163 | * protection against other writers. | |
164 | * | |
165 | * See, for example usages, register_netdevice() and | |
166 | * unregister_netdevice(), which must be called with the rtnl | |
167 | * semaphore held. | |
168 | */ | |
1da177e4 | 169 | DEFINE_RWLOCK(dev_base_lock); |
1da177e4 LT |
170 | EXPORT_SYMBOL(dev_base_lock); |
171 | ||
af12fa6e ET |
172 | /* protects napi_hash addition/deletion and napi_gen_id */ |
173 | static DEFINE_SPINLOCK(napi_hash_lock); | |
174 | ||
175 | static unsigned int napi_gen_id; | |
176 | static DEFINE_HASHTABLE(napi_hash, 8); | |
177 | ||
18afa4b0 | 178 | static seqcount_t devnet_rename_seq; |
c91f6df2 | 179 | |
4e985ada TG |
180 | static inline void dev_base_seq_inc(struct net *net) |
181 | { | |
182 | while (++net->dev_base_seq == 0); | |
183 | } | |
184 | ||
881d966b | 185 | static inline struct hlist_head *dev_name_hash(struct net *net, const char *name) |
1da177e4 | 186 | { |
95c96174 ED |
187 | unsigned int hash = full_name_hash(name, strnlen(name, IFNAMSIZ)); |
188 | ||
08e9897d | 189 | return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)]; |
1da177e4 LT |
190 | } |
191 | ||
881d966b | 192 | static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex) |
1da177e4 | 193 | { |
7c28bd0b | 194 | return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)]; |
1da177e4 LT |
195 | } |
196 | ||
e36fa2f7 | 197 | static inline void rps_lock(struct softnet_data *sd) |
152102c7 CG |
198 | { |
199 | #ifdef CONFIG_RPS | |
e36fa2f7 | 200 | spin_lock(&sd->input_pkt_queue.lock); |
152102c7 CG |
201 | #endif |
202 | } | |
203 | ||
e36fa2f7 | 204 | static inline void rps_unlock(struct softnet_data *sd) |
152102c7 CG |
205 | { |
206 | #ifdef CONFIG_RPS | |
e36fa2f7 | 207 | spin_unlock(&sd->input_pkt_queue.lock); |
152102c7 CG |
208 | #endif |
209 | } | |
210 | ||
ce286d32 | 211 | /* Device list insertion */ |
53759be9 | 212 | static void list_netdevice(struct net_device *dev) |
ce286d32 | 213 | { |
c346dca1 | 214 | struct net *net = dev_net(dev); |
ce286d32 EB |
215 | |
216 | ASSERT_RTNL(); | |
217 | ||
218 | write_lock_bh(&dev_base_lock); | |
c6d14c84 | 219 | list_add_tail_rcu(&dev->dev_list, &net->dev_base_head); |
72c9528b | 220 | hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name)); |
fb699dfd ED |
221 | hlist_add_head_rcu(&dev->index_hlist, |
222 | dev_index_hash(net, dev->ifindex)); | |
ce286d32 | 223 | write_unlock_bh(&dev_base_lock); |
4e985ada TG |
224 | |
225 | dev_base_seq_inc(net); | |
ce286d32 EB |
226 | } |
227 | ||
fb699dfd ED |
228 | /* Device list removal |
229 | * caller must respect a RCU grace period before freeing/reusing dev | |
230 | */ | |
ce286d32 EB |
231 | static void unlist_netdevice(struct net_device *dev) |
232 | { | |
233 | ASSERT_RTNL(); | |
234 | ||
235 | /* Unlink dev from the device chain */ | |
236 | write_lock_bh(&dev_base_lock); | |
c6d14c84 | 237 | list_del_rcu(&dev->dev_list); |
72c9528b | 238 | hlist_del_rcu(&dev->name_hlist); |
fb699dfd | 239 | hlist_del_rcu(&dev->index_hlist); |
ce286d32 | 240 | write_unlock_bh(&dev_base_lock); |
4e985ada TG |
241 | |
242 | dev_base_seq_inc(dev_net(dev)); | |
ce286d32 EB |
243 | } |
244 | ||
1da177e4 LT |
245 | /* |
246 | * Our notifier list | |
247 | */ | |
248 | ||
f07d5b94 | 249 | static RAW_NOTIFIER_HEAD(netdev_chain); |
1da177e4 LT |
250 | |
251 | /* | |
252 | * Device drivers call our routines to queue packets here. We empty the | |
253 | * queue in the local softnet handler. | |
254 | */ | |
bea3348e | 255 | |
9958da05 | 256 | DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data); |
d1b19dff | 257 | EXPORT_PER_CPU_SYMBOL(softnet_data); |
1da177e4 | 258 | |
cf508b12 | 259 | #ifdef CONFIG_LOCKDEP |
723e98b7 | 260 | /* |
c773e847 | 261 | * register_netdevice() inits txq->_xmit_lock and sets lockdep class |
723e98b7 JP |
262 | * according to dev->type |
263 | */ | |
264 | static const unsigned short netdev_lock_type[] = | |
265 | {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25, | |
266 | ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET, | |
267 | ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM, | |
268 | ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP, | |
269 | ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD, | |
270 | ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25, | |
271 | ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP, | |
272 | ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD, | |
273 | ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI, | |
274 | ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE, | |
275 | ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET, | |
276 | ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL, | |
211ed865 PG |
277 | ARPHRD_FCFABRIC, ARPHRD_IEEE80211, ARPHRD_IEEE80211_PRISM, |
278 | ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET, ARPHRD_PHONET_PIPE, | |
279 | ARPHRD_IEEE802154, ARPHRD_VOID, ARPHRD_NONE}; | |
723e98b7 | 280 | |
36cbd3dc | 281 | static const char *const netdev_lock_name[] = |
723e98b7 JP |
282 | {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25", |
283 | "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET", | |
284 | "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM", | |
285 | "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP", | |
286 | "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD", | |
287 | "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25", | |
288 | "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP", | |
289 | "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD", | |
290 | "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI", | |
291 | "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE", | |
292 | "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET", | |
293 | "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL", | |
211ed865 PG |
294 | "_xmit_FCFABRIC", "_xmit_IEEE80211", "_xmit_IEEE80211_PRISM", |
295 | "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", "_xmit_PHONET_PIPE", | |
296 | "_xmit_IEEE802154", "_xmit_VOID", "_xmit_NONE"}; | |
723e98b7 JP |
297 | |
298 | static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)]; | |
cf508b12 | 299 | static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)]; |
723e98b7 JP |
300 | |
301 | static inline unsigned short netdev_lock_pos(unsigned short dev_type) | |
302 | { | |
303 | int i; | |
304 | ||
305 | for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++) | |
306 | if (netdev_lock_type[i] == dev_type) | |
307 | return i; | |
308 | /* the last key is used by default */ | |
309 | return ARRAY_SIZE(netdev_lock_type) - 1; | |
310 | } | |
311 | ||
cf508b12 DM |
312 | static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock, |
313 | unsigned short dev_type) | |
723e98b7 JP |
314 | { |
315 | int i; | |
316 | ||
317 | i = netdev_lock_pos(dev_type); | |
318 | lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i], | |
319 | netdev_lock_name[i]); | |
320 | } | |
cf508b12 DM |
321 | |
322 | static inline void netdev_set_addr_lockdep_class(struct net_device *dev) | |
323 | { | |
324 | int i; | |
325 | ||
326 | i = netdev_lock_pos(dev->type); | |
327 | lockdep_set_class_and_name(&dev->addr_list_lock, | |
328 | &netdev_addr_lock_key[i], | |
329 | netdev_lock_name[i]); | |
330 | } | |
723e98b7 | 331 | #else |
cf508b12 DM |
332 | static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock, |
333 | unsigned short dev_type) | |
334 | { | |
335 | } | |
336 | static inline void netdev_set_addr_lockdep_class(struct net_device *dev) | |
723e98b7 JP |
337 | { |
338 | } | |
339 | #endif | |
1da177e4 LT |
340 | |
341 | /******************************************************************************* | |
342 | ||
343 | Protocol management and registration routines | |
344 | ||
345 | *******************************************************************************/ | |
346 | ||
1da177e4 LT |
347 | /* |
348 | * Add a protocol ID to the list. Now that the input handler is | |
349 | * smarter we can dispense with all the messy stuff that used to be | |
350 | * here. | |
351 | * | |
352 | * BEWARE!!! Protocol handlers, mangling input packets, | |
353 | * MUST BE last in hash buckets and checking protocol handlers | |
354 | * MUST start from promiscuous ptype_all chain in net_bh. | |
355 | * It is true now, do not change it. | |
356 | * Explanation follows: if protocol handler, mangling packet, will | |
357 | * be the first on list, it is not able to sense, that packet | |
358 | * is cloned and should be copied-on-write, so that it will | |
359 | * change it and subsequent readers will get broken packet. | |
360 | * --ANK (980803) | |
361 | */ | |
362 | ||
c07b68e8 ED |
363 | static inline struct list_head *ptype_head(const struct packet_type *pt) |
364 | { | |
365 | if (pt->type == htons(ETH_P_ALL)) | |
366 | return &ptype_all; | |
367 | else | |
368 | return &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK]; | |
369 | } | |
370 | ||
1da177e4 LT |
371 | /** |
372 | * dev_add_pack - add packet handler | |
373 | * @pt: packet type declaration | |
374 | * | |
375 | * Add a protocol handler to the networking stack. The passed &packet_type | |
376 | * is linked into kernel lists and may not be freed until it has been | |
377 | * removed from the kernel lists. | |
378 | * | |
4ec93edb | 379 | * This call does not sleep therefore it can not |
1da177e4 LT |
380 | * guarantee all CPU's that are in middle of receiving packets |
381 | * will see the new packet type (until the next received packet). | |
382 | */ | |
383 | ||
384 | void dev_add_pack(struct packet_type *pt) | |
385 | { | |
c07b68e8 | 386 | struct list_head *head = ptype_head(pt); |
1da177e4 | 387 | |
c07b68e8 ED |
388 | spin_lock(&ptype_lock); |
389 | list_add_rcu(&pt->list, head); | |
390 | spin_unlock(&ptype_lock); | |
1da177e4 | 391 | } |
d1b19dff | 392 | EXPORT_SYMBOL(dev_add_pack); |
1da177e4 | 393 | |
1da177e4 LT |
394 | /** |
395 | * __dev_remove_pack - remove packet handler | |
396 | * @pt: packet type declaration | |
397 | * | |
398 | * Remove a protocol handler that was previously added to the kernel | |
399 | * protocol handlers by dev_add_pack(). The passed &packet_type is removed | |
400 | * from the kernel lists and can be freed or reused once this function | |
4ec93edb | 401 | * returns. |
1da177e4 LT |
402 | * |
403 | * The packet type might still be in use by receivers | |
404 | * and must not be freed until after all the CPU's have gone | |
405 | * through a quiescent state. | |
406 | */ | |
407 | void __dev_remove_pack(struct packet_type *pt) | |
408 | { | |
c07b68e8 | 409 | struct list_head *head = ptype_head(pt); |
1da177e4 LT |
410 | struct packet_type *pt1; |
411 | ||
c07b68e8 | 412 | spin_lock(&ptype_lock); |
1da177e4 LT |
413 | |
414 | list_for_each_entry(pt1, head, list) { | |
415 | if (pt == pt1) { | |
416 | list_del_rcu(&pt->list); | |
417 | goto out; | |
418 | } | |
419 | } | |
420 | ||
7b6cd1ce | 421 | pr_warn("dev_remove_pack: %p not found\n", pt); |
1da177e4 | 422 | out: |
c07b68e8 | 423 | spin_unlock(&ptype_lock); |
1da177e4 | 424 | } |
d1b19dff ED |
425 | EXPORT_SYMBOL(__dev_remove_pack); |
426 | ||
1da177e4 LT |
427 | /** |
428 | * dev_remove_pack - remove packet handler | |
429 | * @pt: packet type declaration | |
430 | * | |
431 | * Remove a protocol handler that was previously added to the kernel | |
432 | * protocol handlers by dev_add_pack(). The passed &packet_type is removed | |
433 | * from the kernel lists and can be freed or reused once this function | |
434 | * returns. | |
435 | * | |
436 | * This call sleeps to guarantee that no CPU is looking at the packet | |
437 | * type after return. | |
438 | */ | |
439 | void dev_remove_pack(struct packet_type *pt) | |
440 | { | |
441 | __dev_remove_pack(pt); | |
4ec93edb | 442 | |
1da177e4 LT |
443 | synchronize_net(); |
444 | } | |
d1b19dff | 445 | EXPORT_SYMBOL(dev_remove_pack); |
1da177e4 | 446 | |
62532da9 VY |
447 | |
448 | /** | |
449 | * dev_add_offload - register offload handlers | |
450 | * @po: protocol offload declaration | |
451 | * | |
452 | * Add protocol offload handlers to the networking stack. The passed | |
453 | * &proto_offload is linked into kernel lists and may not be freed until | |
454 | * it has been removed from the kernel lists. | |
455 | * | |
456 | * This call does not sleep therefore it can not | |
457 | * guarantee all CPU's that are in middle of receiving packets | |
458 | * will see the new offload handlers (until the next received packet). | |
459 | */ | |
460 | void dev_add_offload(struct packet_offload *po) | |
461 | { | |
462 | struct list_head *head = &offload_base; | |
463 | ||
464 | spin_lock(&offload_lock); | |
465 | list_add_rcu(&po->list, head); | |
466 | spin_unlock(&offload_lock); | |
467 | } | |
468 | EXPORT_SYMBOL(dev_add_offload); | |
469 | ||
470 | /** | |
471 | * __dev_remove_offload - remove offload handler | |
472 | * @po: packet offload declaration | |
473 | * | |
474 | * Remove a protocol offload handler that was previously added to the | |
475 | * kernel offload handlers by dev_add_offload(). The passed &offload_type | |
476 | * is removed from the kernel lists and can be freed or reused once this | |
477 | * function returns. | |
478 | * | |
479 | * The packet type might still be in use by receivers | |
480 | * and must not be freed until after all the CPU's have gone | |
481 | * through a quiescent state. | |
482 | */ | |
483 | void __dev_remove_offload(struct packet_offload *po) | |
484 | { | |
485 | struct list_head *head = &offload_base; | |
486 | struct packet_offload *po1; | |
487 | ||
c53aa505 | 488 | spin_lock(&offload_lock); |
62532da9 VY |
489 | |
490 | list_for_each_entry(po1, head, list) { | |
491 | if (po == po1) { | |
492 | list_del_rcu(&po->list); | |
493 | goto out; | |
494 | } | |
495 | } | |
496 | ||
497 | pr_warn("dev_remove_offload: %p not found\n", po); | |
498 | out: | |
c53aa505 | 499 | spin_unlock(&offload_lock); |
62532da9 VY |
500 | } |
501 | EXPORT_SYMBOL(__dev_remove_offload); | |
502 | ||
503 | /** | |
504 | * dev_remove_offload - remove packet offload handler | |
505 | * @po: packet offload declaration | |
506 | * | |
507 | * Remove a packet offload handler that was previously added to the kernel | |
508 | * offload handlers by dev_add_offload(). The passed &offload_type is | |
509 | * removed from the kernel lists and can be freed or reused once this | |
510 | * function returns. | |
511 | * | |
512 | * This call sleeps to guarantee that no CPU is looking at the packet | |
513 | * type after return. | |
514 | */ | |
515 | void dev_remove_offload(struct packet_offload *po) | |
516 | { | |
517 | __dev_remove_offload(po); | |
518 | ||
519 | synchronize_net(); | |
520 | } | |
521 | EXPORT_SYMBOL(dev_remove_offload); | |
522 | ||
1da177e4 LT |
523 | /****************************************************************************** |
524 | ||
525 | Device Boot-time Settings Routines | |
526 | ||
527 | *******************************************************************************/ | |
528 | ||
529 | /* Boot time configuration table */ | |
530 | static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX]; | |
531 | ||
532 | /** | |
533 | * netdev_boot_setup_add - add new setup entry | |
534 | * @name: name of the device | |
535 | * @map: configured settings for the device | |
536 | * | |
537 | * Adds new setup entry to the dev_boot_setup list. The function | |
538 | * returns 0 on error and 1 on success. This is a generic routine to | |
539 | * all netdevices. | |
540 | */ | |
541 | static int netdev_boot_setup_add(char *name, struct ifmap *map) | |
542 | { | |
543 | struct netdev_boot_setup *s; | |
544 | int i; | |
545 | ||
546 | s = dev_boot_setup; | |
547 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) { | |
548 | if (s[i].name[0] == '\0' || s[i].name[0] == ' ') { | |
549 | memset(s[i].name, 0, sizeof(s[i].name)); | |
93b3cff9 | 550 | strlcpy(s[i].name, name, IFNAMSIZ); |
1da177e4 LT |
551 | memcpy(&s[i].map, map, sizeof(s[i].map)); |
552 | break; | |
553 | } | |
554 | } | |
555 | ||
556 | return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1; | |
557 | } | |
558 | ||
559 | /** | |
560 | * netdev_boot_setup_check - check boot time settings | |
561 | * @dev: the netdevice | |
562 | * | |
563 | * Check boot time settings for the device. | |
564 | * The found settings are set for the device to be used | |
565 | * later in the device probing. | |
566 | * Returns 0 if no settings found, 1 if they are. | |
567 | */ | |
568 | int netdev_boot_setup_check(struct net_device *dev) | |
569 | { | |
570 | struct netdev_boot_setup *s = dev_boot_setup; | |
571 | int i; | |
572 | ||
573 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) { | |
574 | if (s[i].name[0] != '\0' && s[i].name[0] != ' ' && | |
93b3cff9 | 575 | !strcmp(dev->name, s[i].name)) { |
1da177e4 LT |
576 | dev->irq = s[i].map.irq; |
577 | dev->base_addr = s[i].map.base_addr; | |
578 | dev->mem_start = s[i].map.mem_start; | |
579 | dev->mem_end = s[i].map.mem_end; | |
580 | return 1; | |
581 | } | |
582 | } | |
583 | return 0; | |
584 | } | |
d1b19dff | 585 | EXPORT_SYMBOL(netdev_boot_setup_check); |
1da177e4 LT |
586 | |
587 | ||
588 | /** | |
589 | * netdev_boot_base - get address from boot time settings | |
590 | * @prefix: prefix for network device | |
591 | * @unit: id for network device | |
592 | * | |
593 | * Check boot time settings for the base address of device. | |
594 | * The found settings are set for the device to be used | |
595 | * later in the device probing. | |
596 | * Returns 0 if no settings found. | |
597 | */ | |
598 | unsigned long netdev_boot_base(const char *prefix, int unit) | |
599 | { | |
600 | const struct netdev_boot_setup *s = dev_boot_setup; | |
601 | char name[IFNAMSIZ]; | |
602 | int i; | |
603 | ||
604 | sprintf(name, "%s%d", prefix, unit); | |
605 | ||
606 | /* | |
607 | * If device already registered then return base of 1 | |
608 | * to indicate not to probe for this interface | |
609 | */ | |
881d966b | 610 | if (__dev_get_by_name(&init_net, name)) |
1da177e4 LT |
611 | return 1; |
612 | ||
613 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) | |
614 | if (!strcmp(name, s[i].name)) | |
615 | return s[i].map.base_addr; | |
616 | return 0; | |
617 | } | |
618 | ||
619 | /* | |
620 | * Saves at boot time configured settings for any netdevice. | |
621 | */ | |
622 | int __init netdev_boot_setup(char *str) | |
623 | { | |
624 | int ints[5]; | |
625 | struct ifmap map; | |
626 | ||
627 | str = get_options(str, ARRAY_SIZE(ints), ints); | |
628 | if (!str || !*str) | |
629 | return 0; | |
630 | ||
631 | /* Save settings */ | |
632 | memset(&map, 0, sizeof(map)); | |
633 | if (ints[0] > 0) | |
634 | map.irq = ints[1]; | |
635 | if (ints[0] > 1) | |
636 | map.base_addr = ints[2]; | |
637 | if (ints[0] > 2) | |
638 | map.mem_start = ints[3]; | |
639 | if (ints[0] > 3) | |
640 | map.mem_end = ints[4]; | |
641 | ||
642 | /* Add new entry to the list */ | |
643 | return netdev_boot_setup_add(str, &map); | |
644 | } | |
645 | ||
646 | __setup("netdev=", netdev_boot_setup); | |
647 | ||
648 | /******************************************************************************* | |
649 | ||
650 | Device Interface Subroutines | |
651 | ||
652 | *******************************************************************************/ | |
653 | ||
654 | /** | |
655 | * __dev_get_by_name - find a device by its name | |
c4ea43c5 | 656 | * @net: the applicable net namespace |
1da177e4 LT |
657 | * @name: name to find |
658 | * | |
659 | * Find an interface by name. Must be called under RTNL semaphore | |
660 | * or @dev_base_lock. If the name is found a pointer to the device | |
661 | * is returned. If the name is not found then %NULL is returned. The | |
662 | * reference counters are not incremented so the caller must be | |
663 | * careful with locks. | |
664 | */ | |
665 | ||
881d966b | 666 | struct net_device *__dev_get_by_name(struct net *net, const char *name) |
1da177e4 | 667 | { |
0bd8d536 ED |
668 | struct net_device *dev; |
669 | struct hlist_head *head = dev_name_hash(net, name); | |
1da177e4 | 670 | |
b67bfe0d | 671 | hlist_for_each_entry(dev, head, name_hlist) |
1da177e4 LT |
672 | if (!strncmp(dev->name, name, IFNAMSIZ)) |
673 | return dev; | |
0bd8d536 | 674 | |
1da177e4 LT |
675 | return NULL; |
676 | } | |
d1b19dff | 677 | EXPORT_SYMBOL(__dev_get_by_name); |
1da177e4 | 678 | |
72c9528b ED |
679 | /** |
680 | * dev_get_by_name_rcu - find a device by its name | |
681 | * @net: the applicable net namespace | |
682 | * @name: name to find | |
683 | * | |
684 | * Find an interface by name. | |
685 | * If the name is found a pointer to the device is returned. | |
686 | * If the name is not found then %NULL is returned. | |
687 | * The reference counters are not incremented so the caller must be | |
688 | * careful with locks. The caller must hold RCU lock. | |
689 | */ | |
690 | ||
691 | struct net_device *dev_get_by_name_rcu(struct net *net, const char *name) | |
692 | { | |
72c9528b ED |
693 | struct net_device *dev; |
694 | struct hlist_head *head = dev_name_hash(net, name); | |
695 | ||
b67bfe0d | 696 | hlist_for_each_entry_rcu(dev, head, name_hlist) |
72c9528b ED |
697 | if (!strncmp(dev->name, name, IFNAMSIZ)) |
698 | return dev; | |
699 | ||
700 | return NULL; | |
701 | } | |
702 | EXPORT_SYMBOL(dev_get_by_name_rcu); | |
703 | ||
1da177e4 LT |
704 | /** |
705 | * dev_get_by_name - find a device by its name | |
c4ea43c5 | 706 | * @net: the applicable net namespace |
1da177e4 LT |
707 | * @name: name to find |
708 | * | |
709 | * Find an interface by name. This can be called from any | |
710 | * context and does its own locking. The returned handle has | |
711 | * the usage count incremented and the caller must use dev_put() to | |
712 | * release it when it is no longer needed. %NULL is returned if no | |
713 | * matching device is found. | |
714 | */ | |
715 | ||
881d966b | 716 | struct net_device *dev_get_by_name(struct net *net, const char *name) |
1da177e4 LT |
717 | { |
718 | struct net_device *dev; | |
719 | ||
72c9528b ED |
720 | rcu_read_lock(); |
721 | dev = dev_get_by_name_rcu(net, name); | |
1da177e4 LT |
722 | if (dev) |
723 | dev_hold(dev); | |
72c9528b | 724 | rcu_read_unlock(); |
1da177e4 LT |
725 | return dev; |
726 | } | |
d1b19dff | 727 | EXPORT_SYMBOL(dev_get_by_name); |
1da177e4 LT |
728 | |
729 | /** | |
730 | * __dev_get_by_index - find a device by its ifindex | |
c4ea43c5 | 731 | * @net: the applicable net namespace |
1da177e4 LT |
732 | * @ifindex: index of device |
733 | * | |
734 | * Search for an interface by index. Returns %NULL if the device | |
735 | * is not found or a pointer to the device. The device has not | |
736 | * had its reference counter increased so the caller must be careful | |
737 | * about locking. The caller must hold either the RTNL semaphore | |
738 | * or @dev_base_lock. | |
739 | */ | |
740 | ||
881d966b | 741 | struct net_device *__dev_get_by_index(struct net *net, int ifindex) |
1da177e4 | 742 | { |
0bd8d536 ED |
743 | struct net_device *dev; |
744 | struct hlist_head *head = dev_index_hash(net, ifindex); | |
1da177e4 | 745 | |
b67bfe0d | 746 | hlist_for_each_entry(dev, head, index_hlist) |
1da177e4 LT |
747 | if (dev->ifindex == ifindex) |
748 | return dev; | |
0bd8d536 | 749 | |
1da177e4 LT |
750 | return NULL; |
751 | } | |
d1b19dff | 752 | EXPORT_SYMBOL(__dev_get_by_index); |
1da177e4 | 753 | |
fb699dfd ED |
754 | /** |
755 | * dev_get_by_index_rcu - find a device by its ifindex | |
756 | * @net: the applicable net namespace | |
757 | * @ifindex: index of device | |
758 | * | |
759 | * Search for an interface by index. Returns %NULL if the device | |
760 | * is not found or a pointer to the device. The device has not | |
761 | * had its reference counter increased so the caller must be careful | |
762 | * about locking. The caller must hold RCU lock. | |
763 | */ | |
764 | ||
765 | struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex) | |
766 | { | |
fb699dfd ED |
767 | struct net_device *dev; |
768 | struct hlist_head *head = dev_index_hash(net, ifindex); | |
769 | ||
b67bfe0d | 770 | hlist_for_each_entry_rcu(dev, head, index_hlist) |
fb699dfd ED |
771 | if (dev->ifindex == ifindex) |
772 | return dev; | |
773 | ||
774 | return NULL; | |
775 | } | |
776 | EXPORT_SYMBOL(dev_get_by_index_rcu); | |
777 | ||
1da177e4 LT |
778 | |
779 | /** | |
780 | * dev_get_by_index - find a device by its ifindex | |
c4ea43c5 | 781 | * @net: the applicable net namespace |
1da177e4 LT |
782 | * @ifindex: index of device |
783 | * | |
784 | * Search for an interface by index. Returns NULL if the device | |
785 | * is not found or a pointer to the device. The device returned has | |
786 | * had a reference added and the pointer is safe until the user calls | |
787 | * dev_put to indicate they have finished with it. | |
788 | */ | |
789 | ||
881d966b | 790 | struct net_device *dev_get_by_index(struct net *net, int ifindex) |
1da177e4 LT |
791 | { |
792 | struct net_device *dev; | |
793 | ||
fb699dfd ED |
794 | rcu_read_lock(); |
795 | dev = dev_get_by_index_rcu(net, ifindex); | |
1da177e4 LT |
796 | if (dev) |
797 | dev_hold(dev); | |
fb699dfd | 798 | rcu_read_unlock(); |
1da177e4 LT |
799 | return dev; |
800 | } | |
d1b19dff | 801 | EXPORT_SYMBOL(dev_get_by_index); |
1da177e4 | 802 | |
5dbe7c17 NS |
803 | /** |
804 | * netdev_get_name - get a netdevice name, knowing its ifindex. | |
805 | * @net: network namespace | |
806 | * @name: a pointer to the buffer where the name will be stored. | |
807 | * @ifindex: the ifindex of the interface to get the name from. | |
808 | * | |
809 | * The use of raw_seqcount_begin() and cond_resched() before | |
810 | * retrying is required as we want to give the writers a chance | |
811 | * to complete when CONFIG_PREEMPT is not set. | |
812 | */ | |
813 | int netdev_get_name(struct net *net, char *name, int ifindex) | |
814 | { | |
815 | struct net_device *dev; | |
816 | unsigned int seq; | |
817 | ||
818 | retry: | |
819 | seq = raw_seqcount_begin(&devnet_rename_seq); | |
820 | rcu_read_lock(); | |
821 | dev = dev_get_by_index_rcu(net, ifindex); | |
822 | if (!dev) { | |
823 | rcu_read_unlock(); | |
824 | return -ENODEV; | |
825 | } | |
826 | ||
827 | strcpy(name, dev->name); | |
828 | rcu_read_unlock(); | |
829 | if (read_seqcount_retry(&devnet_rename_seq, seq)) { | |
830 | cond_resched(); | |
831 | goto retry; | |
832 | } | |
833 | ||
834 | return 0; | |
835 | } | |
836 | ||
1da177e4 | 837 | /** |
941666c2 | 838 | * dev_getbyhwaddr_rcu - find a device by its hardware address |
c4ea43c5 | 839 | * @net: the applicable net namespace |
1da177e4 LT |
840 | * @type: media type of device |
841 | * @ha: hardware address | |
842 | * | |
843 | * Search for an interface by MAC address. Returns NULL if the device | |
c506653d ED |
844 | * is not found or a pointer to the device. |
845 | * The caller must hold RCU or RTNL. | |
941666c2 | 846 | * The returned device has not had its ref count increased |
1da177e4 LT |
847 | * and the caller must therefore be careful about locking |
848 | * | |
1da177e4 LT |
849 | */ |
850 | ||
941666c2 ED |
851 | struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type, |
852 | const char *ha) | |
1da177e4 LT |
853 | { |
854 | struct net_device *dev; | |
855 | ||
941666c2 | 856 | for_each_netdev_rcu(net, dev) |
1da177e4 LT |
857 | if (dev->type == type && |
858 | !memcmp(dev->dev_addr, ha, dev->addr_len)) | |
7562f876 PE |
859 | return dev; |
860 | ||
861 | return NULL; | |
1da177e4 | 862 | } |
941666c2 | 863 | EXPORT_SYMBOL(dev_getbyhwaddr_rcu); |
cf309e3f | 864 | |
881d966b | 865 | struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type) |
1da177e4 LT |
866 | { |
867 | struct net_device *dev; | |
868 | ||
4e9cac2b | 869 | ASSERT_RTNL(); |
881d966b | 870 | for_each_netdev(net, dev) |
4e9cac2b | 871 | if (dev->type == type) |
7562f876 PE |
872 | return dev; |
873 | ||
874 | return NULL; | |
4e9cac2b | 875 | } |
4e9cac2b PM |
876 | EXPORT_SYMBOL(__dev_getfirstbyhwtype); |
877 | ||
881d966b | 878 | struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type) |
4e9cac2b | 879 | { |
99fe3c39 | 880 | struct net_device *dev, *ret = NULL; |
4e9cac2b | 881 | |
99fe3c39 ED |
882 | rcu_read_lock(); |
883 | for_each_netdev_rcu(net, dev) | |
884 | if (dev->type == type) { | |
885 | dev_hold(dev); | |
886 | ret = dev; | |
887 | break; | |
888 | } | |
889 | rcu_read_unlock(); | |
890 | return ret; | |
1da177e4 | 891 | } |
1da177e4 LT |
892 | EXPORT_SYMBOL(dev_getfirstbyhwtype); |
893 | ||
894 | /** | |
bb69ae04 | 895 | * dev_get_by_flags_rcu - find any device with given flags |
c4ea43c5 | 896 | * @net: the applicable net namespace |
1da177e4 LT |
897 | * @if_flags: IFF_* values |
898 | * @mask: bitmask of bits in if_flags to check | |
899 | * | |
900 | * Search for any interface with the given flags. Returns NULL if a device | |
bb69ae04 ED |
901 | * is not found or a pointer to the device. Must be called inside |
902 | * rcu_read_lock(), and result refcount is unchanged. | |
1da177e4 LT |
903 | */ |
904 | ||
bb69ae04 | 905 | struct net_device *dev_get_by_flags_rcu(struct net *net, unsigned short if_flags, |
d1b19dff | 906 | unsigned short mask) |
1da177e4 | 907 | { |
7562f876 | 908 | struct net_device *dev, *ret; |
1da177e4 | 909 | |
7562f876 | 910 | ret = NULL; |
c6d14c84 | 911 | for_each_netdev_rcu(net, dev) { |
1da177e4 | 912 | if (((dev->flags ^ if_flags) & mask) == 0) { |
7562f876 | 913 | ret = dev; |
1da177e4 LT |
914 | break; |
915 | } | |
916 | } | |
7562f876 | 917 | return ret; |
1da177e4 | 918 | } |
bb69ae04 | 919 | EXPORT_SYMBOL(dev_get_by_flags_rcu); |
1da177e4 LT |
920 | |
921 | /** | |
922 | * dev_valid_name - check if name is okay for network device | |
923 | * @name: name string | |
924 | * | |
925 | * Network device names need to be valid file names to | |
c7fa9d18 DM |
926 | * to allow sysfs to work. We also disallow any kind of |
927 | * whitespace. | |
1da177e4 | 928 | */ |
95f050bf | 929 | bool dev_valid_name(const char *name) |
1da177e4 | 930 | { |
c7fa9d18 | 931 | if (*name == '\0') |
95f050bf | 932 | return false; |
b6fe17d6 | 933 | if (strlen(name) >= IFNAMSIZ) |
95f050bf | 934 | return false; |
c7fa9d18 | 935 | if (!strcmp(name, ".") || !strcmp(name, "..")) |
95f050bf | 936 | return false; |
c7fa9d18 DM |
937 | |
938 | while (*name) { | |
939 | if (*name == '/' || isspace(*name)) | |
95f050bf | 940 | return false; |
c7fa9d18 DM |
941 | name++; |
942 | } | |
95f050bf | 943 | return true; |
1da177e4 | 944 | } |
d1b19dff | 945 | EXPORT_SYMBOL(dev_valid_name); |
1da177e4 LT |
946 | |
947 | /** | |
b267b179 EB |
948 | * __dev_alloc_name - allocate a name for a device |
949 | * @net: network namespace to allocate the device name in | |
1da177e4 | 950 | * @name: name format string |
b267b179 | 951 | * @buf: scratch buffer and result name string |
1da177e4 LT |
952 | * |
953 | * Passed a format string - eg "lt%d" it will try and find a suitable | |
3041a069 SH |
954 | * id. It scans list of devices to build up a free map, then chooses |
955 | * the first empty slot. The caller must hold the dev_base or rtnl lock | |
956 | * while allocating the name and adding the device in order to avoid | |
957 | * duplicates. | |
958 | * Limited to bits_per_byte * page size devices (ie 32K on most platforms). | |
959 | * Returns the number of the unit assigned or a negative errno code. | |
1da177e4 LT |
960 | */ |
961 | ||
b267b179 | 962 | static int __dev_alloc_name(struct net *net, const char *name, char *buf) |
1da177e4 LT |
963 | { |
964 | int i = 0; | |
1da177e4 LT |
965 | const char *p; |
966 | const int max_netdevices = 8*PAGE_SIZE; | |
cfcabdcc | 967 | unsigned long *inuse; |
1da177e4 LT |
968 | struct net_device *d; |
969 | ||
970 | p = strnchr(name, IFNAMSIZ-1, '%'); | |
971 | if (p) { | |
972 | /* | |
973 | * Verify the string as this thing may have come from | |
974 | * the user. There must be either one "%d" and no other "%" | |
975 | * characters. | |
976 | */ | |
977 | if (p[1] != 'd' || strchr(p + 2, '%')) | |
978 | return -EINVAL; | |
979 | ||
980 | /* Use one page as a bit array of possible slots */ | |
cfcabdcc | 981 | inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC); |
1da177e4 LT |
982 | if (!inuse) |
983 | return -ENOMEM; | |
984 | ||
881d966b | 985 | for_each_netdev(net, d) { |
1da177e4 LT |
986 | if (!sscanf(d->name, name, &i)) |
987 | continue; | |
988 | if (i < 0 || i >= max_netdevices) | |
989 | continue; | |
990 | ||
991 | /* avoid cases where sscanf is not exact inverse of printf */ | |
b267b179 | 992 | snprintf(buf, IFNAMSIZ, name, i); |
1da177e4 LT |
993 | if (!strncmp(buf, d->name, IFNAMSIZ)) |
994 | set_bit(i, inuse); | |
995 | } | |
996 | ||
997 | i = find_first_zero_bit(inuse, max_netdevices); | |
998 | free_page((unsigned long) inuse); | |
999 | } | |
1000 | ||
d9031024 OP |
1001 | if (buf != name) |
1002 | snprintf(buf, IFNAMSIZ, name, i); | |
b267b179 | 1003 | if (!__dev_get_by_name(net, buf)) |
1da177e4 | 1004 | return i; |
1da177e4 LT |
1005 | |
1006 | /* It is possible to run out of possible slots | |
1007 | * when the name is long and there isn't enough space left | |
1008 | * for the digits, or if all bits are used. | |
1009 | */ | |
1010 | return -ENFILE; | |
1011 | } | |
1012 | ||
b267b179 EB |
1013 | /** |
1014 | * dev_alloc_name - allocate a name for a device | |
1015 | * @dev: device | |
1016 | * @name: name format string | |
1017 | * | |
1018 | * Passed a format string - eg "lt%d" it will try and find a suitable | |
1019 | * id. It scans list of devices to build up a free map, then chooses | |
1020 | * the first empty slot. The caller must hold the dev_base or rtnl lock | |
1021 | * while allocating the name and adding the device in order to avoid | |
1022 | * duplicates. | |
1023 | * Limited to bits_per_byte * page size devices (ie 32K on most platforms). | |
1024 | * Returns the number of the unit assigned or a negative errno code. | |
1025 | */ | |
1026 | ||
1027 | int dev_alloc_name(struct net_device *dev, const char *name) | |
1028 | { | |
1029 | char buf[IFNAMSIZ]; | |
1030 | struct net *net; | |
1031 | int ret; | |
1032 | ||
c346dca1 YH |
1033 | BUG_ON(!dev_net(dev)); |
1034 | net = dev_net(dev); | |
b267b179 EB |
1035 | ret = __dev_alloc_name(net, name, buf); |
1036 | if (ret >= 0) | |
1037 | strlcpy(dev->name, buf, IFNAMSIZ); | |
1038 | return ret; | |
1039 | } | |
d1b19dff | 1040 | EXPORT_SYMBOL(dev_alloc_name); |
b267b179 | 1041 | |
828de4f6 G |
1042 | static int dev_alloc_name_ns(struct net *net, |
1043 | struct net_device *dev, | |
1044 | const char *name) | |
d9031024 | 1045 | { |
828de4f6 G |
1046 | char buf[IFNAMSIZ]; |
1047 | int ret; | |
8ce6cebc | 1048 | |
828de4f6 G |
1049 | ret = __dev_alloc_name(net, name, buf); |
1050 | if (ret >= 0) | |
1051 | strlcpy(dev->name, buf, IFNAMSIZ); | |
1052 | return ret; | |
1053 | } | |
1054 | ||
1055 | static int dev_get_valid_name(struct net *net, | |
1056 | struct net_device *dev, | |
1057 | const char *name) | |
1058 | { | |
1059 | BUG_ON(!net); | |
8ce6cebc | 1060 | |
d9031024 OP |
1061 | if (!dev_valid_name(name)) |
1062 | return -EINVAL; | |
1063 | ||
1c5cae81 | 1064 | if (strchr(name, '%')) |
828de4f6 | 1065 | return dev_alloc_name_ns(net, dev, name); |
d9031024 OP |
1066 | else if (__dev_get_by_name(net, name)) |
1067 | return -EEXIST; | |
8ce6cebc DL |
1068 | else if (dev->name != name) |
1069 | strlcpy(dev->name, name, IFNAMSIZ); | |
d9031024 OP |
1070 | |
1071 | return 0; | |
1072 | } | |
1da177e4 LT |
1073 | |
1074 | /** | |
1075 | * dev_change_name - change name of a device | |
1076 | * @dev: device | |
1077 | * @newname: name (or format string) must be at least IFNAMSIZ | |
1078 | * | |
1079 | * Change name of a device, can pass format strings "eth%d". | |
1080 | * for wildcarding. | |
1081 | */ | |
cf04a4c7 | 1082 | int dev_change_name(struct net_device *dev, const char *newname) |
1da177e4 | 1083 | { |
fcc5a03a | 1084 | char oldname[IFNAMSIZ]; |
1da177e4 | 1085 | int err = 0; |
fcc5a03a | 1086 | int ret; |
881d966b | 1087 | struct net *net; |
1da177e4 LT |
1088 | |
1089 | ASSERT_RTNL(); | |
c346dca1 | 1090 | BUG_ON(!dev_net(dev)); |
1da177e4 | 1091 | |
c346dca1 | 1092 | net = dev_net(dev); |
1da177e4 LT |
1093 | if (dev->flags & IFF_UP) |
1094 | return -EBUSY; | |
1095 | ||
30e6c9fa | 1096 | write_seqcount_begin(&devnet_rename_seq); |
c91f6df2 BH |
1097 | |
1098 | if (strncmp(newname, dev->name, IFNAMSIZ) == 0) { | |
30e6c9fa | 1099 | write_seqcount_end(&devnet_rename_seq); |
c8d90dca | 1100 | return 0; |
c91f6df2 | 1101 | } |
c8d90dca | 1102 | |
fcc5a03a HX |
1103 | memcpy(oldname, dev->name, IFNAMSIZ); |
1104 | ||
828de4f6 | 1105 | err = dev_get_valid_name(net, dev, newname); |
c91f6df2 | 1106 | if (err < 0) { |
30e6c9fa | 1107 | write_seqcount_end(&devnet_rename_seq); |
d9031024 | 1108 | return err; |
c91f6df2 | 1109 | } |
1da177e4 | 1110 | |
fcc5a03a | 1111 | rollback: |
a1b3f594 EB |
1112 | ret = device_rename(&dev->dev, dev->name); |
1113 | if (ret) { | |
1114 | memcpy(dev->name, oldname, IFNAMSIZ); | |
30e6c9fa | 1115 | write_seqcount_end(&devnet_rename_seq); |
a1b3f594 | 1116 | return ret; |
dcc99773 | 1117 | } |
7f988eab | 1118 | |
30e6c9fa | 1119 | write_seqcount_end(&devnet_rename_seq); |
c91f6df2 | 1120 | |
7f988eab | 1121 | write_lock_bh(&dev_base_lock); |
372b2312 | 1122 | hlist_del_rcu(&dev->name_hlist); |
72c9528b ED |
1123 | write_unlock_bh(&dev_base_lock); |
1124 | ||
1125 | synchronize_rcu(); | |
1126 | ||
1127 | write_lock_bh(&dev_base_lock); | |
1128 | hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name)); | |
7f988eab HX |
1129 | write_unlock_bh(&dev_base_lock); |
1130 | ||
056925ab | 1131 | ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev); |
fcc5a03a HX |
1132 | ret = notifier_to_errno(ret); |
1133 | ||
1134 | if (ret) { | |
91e9c07b ED |
1135 | /* err >= 0 after dev_alloc_name() or stores the first errno */ |
1136 | if (err >= 0) { | |
fcc5a03a | 1137 | err = ret; |
30e6c9fa | 1138 | write_seqcount_begin(&devnet_rename_seq); |
fcc5a03a HX |
1139 | memcpy(dev->name, oldname, IFNAMSIZ); |
1140 | goto rollback; | |
91e9c07b | 1141 | } else { |
7b6cd1ce | 1142 | pr_err("%s: name change rollback failed: %d\n", |
91e9c07b | 1143 | dev->name, ret); |
fcc5a03a HX |
1144 | } |
1145 | } | |
1da177e4 LT |
1146 | |
1147 | return err; | |
1148 | } | |
1149 | ||
0b815a1a SH |
1150 | /** |
1151 | * dev_set_alias - change ifalias of a device | |
1152 | * @dev: device | |
1153 | * @alias: name up to IFALIASZ | |
f0db275a | 1154 | * @len: limit of bytes to copy from info |
0b815a1a SH |
1155 | * |
1156 | * Set ifalias for a device, | |
1157 | */ | |
1158 | int dev_set_alias(struct net_device *dev, const char *alias, size_t len) | |
1159 | { | |
7364e445 AK |
1160 | char *new_ifalias; |
1161 | ||
0b815a1a SH |
1162 | ASSERT_RTNL(); |
1163 | ||
1164 | if (len >= IFALIASZ) | |
1165 | return -EINVAL; | |
1166 | ||
96ca4a2c | 1167 | if (!len) { |
388dfc2d SK |
1168 | kfree(dev->ifalias); |
1169 | dev->ifalias = NULL; | |
96ca4a2c OH |
1170 | return 0; |
1171 | } | |
1172 | ||
7364e445 AK |
1173 | new_ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL); |
1174 | if (!new_ifalias) | |
0b815a1a | 1175 | return -ENOMEM; |
7364e445 | 1176 | dev->ifalias = new_ifalias; |
0b815a1a SH |
1177 | |
1178 | strlcpy(dev->ifalias, alias, len+1); | |
1179 | return len; | |
1180 | } | |
1181 | ||
1182 | ||
d8a33ac4 | 1183 | /** |
3041a069 | 1184 | * netdev_features_change - device changes features |
d8a33ac4 SH |
1185 | * @dev: device to cause notification |
1186 | * | |
1187 | * Called to indicate a device has changed features. | |
1188 | */ | |
1189 | void netdev_features_change(struct net_device *dev) | |
1190 | { | |
056925ab | 1191 | call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev); |
d8a33ac4 SH |
1192 | } |
1193 | EXPORT_SYMBOL(netdev_features_change); | |
1194 | ||
1da177e4 LT |
1195 | /** |
1196 | * netdev_state_change - device changes state | |
1197 | * @dev: device to cause notification | |
1198 | * | |
1199 | * Called to indicate a device has changed state. This function calls | |
1200 | * the notifier chains for netdev_chain and sends a NEWLINK message | |
1201 | * to the routing socket. | |
1202 | */ | |
1203 | void netdev_state_change(struct net_device *dev) | |
1204 | { | |
1205 | if (dev->flags & IFF_UP) { | |
056925ab | 1206 | call_netdevice_notifiers(NETDEV_CHANGE, dev); |
7f294054 | 1207 | rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL); |
1da177e4 LT |
1208 | } |
1209 | } | |
d1b19dff | 1210 | EXPORT_SYMBOL(netdev_state_change); |
1da177e4 | 1211 | |
ee89bab1 AW |
1212 | /** |
1213 | * netdev_notify_peers - notify network peers about existence of @dev | |
1214 | * @dev: network device | |
1215 | * | |
1216 | * Generate traffic such that interested network peers are aware of | |
1217 | * @dev, such as by generating a gratuitous ARP. This may be used when | |
1218 | * a device wants to inform the rest of the network about some sort of | |
1219 | * reconfiguration such as a failover event or virtual machine | |
1220 | * migration. | |
1221 | */ | |
1222 | void netdev_notify_peers(struct net_device *dev) | |
c1da4ac7 | 1223 | { |
ee89bab1 AW |
1224 | rtnl_lock(); |
1225 | call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, dev); | |
1226 | rtnl_unlock(); | |
c1da4ac7 | 1227 | } |
ee89bab1 | 1228 | EXPORT_SYMBOL(netdev_notify_peers); |
c1da4ac7 | 1229 | |
bd380811 | 1230 | static int __dev_open(struct net_device *dev) |
1da177e4 | 1231 | { |
d314774c | 1232 | const struct net_device_ops *ops = dev->netdev_ops; |
3b8bcfd5 | 1233 | int ret; |
1da177e4 | 1234 | |
e46b66bc BH |
1235 | ASSERT_RTNL(); |
1236 | ||
1da177e4 LT |
1237 | if (!netif_device_present(dev)) |
1238 | return -ENODEV; | |
1239 | ||
ca99ca14 NH |
1240 | /* Block netpoll from trying to do any rx path servicing. |
1241 | * If we don't do this there is a chance ndo_poll_controller | |
1242 | * or ndo_poll may be running while we open the device | |
1243 | */ | |
da6e378b | 1244 | netpoll_rx_disable(dev); |
ca99ca14 | 1245 | |
3b8bcfd5 JB |
1246 | ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev); |
1247 | ret = notifier_to_errno(ret); | |
1248 | if (ret) | |
1249 | return ret; | |
1250 | ||
1da177e4 | 1251 | set_bit(__LINK_STATE_START, &dev->state); |
bada339b | 1252 | |
d314774c SH |
1253 | if (ops->ndo_validate_addr) |
1254 | ret = ops->ndo_validate_addr(dev); | |
bada339b | 1255 | |
d314774c SH |
1256 | if (!ret && ops->ndo_open) |
1257 | ret = ops->ndo_open(dev); | |
1da177e4 | 1258 | |
ca99ca14 NH |
1259 | netpoll_rx_enable(dev); |
1260 | ||
bada339b JG |
1261 | if (ret) |
1262 | clear_bit(__LINK_STATE_START, &dev->state); | |
1263 | else { | |
1da177e4 | 1264 | dev->flags |= IFF_UP; |
b4bd07c2 | 1265 | net_dmaengine_get(); |
4417da66 | 1266 | dev_set_rx_mode(dev); |
1da177e4 | 1267 | dev_activate(dev); |
7bf23575 | 1268 | add_device_randomness(dev->dev_addr, dev->addr_len); |
1da177e4 | 1269 | } |
bada339b | 1270 | |
1da177e4 LT |
1271 | return ret; |
1272 | } | |
1273 | ||
1274 | /** | |
bd380811 PM |
1275 | * dev_open - prepare an interface for use. |
1276 | * @dev: device to open | |
1da177e4 | 1277 | * |
bd380811 PM |
1278 | * Takes a device from down to up state. The device's private open |
1279 | * function is invoked and then the multicast lists are loaded. Finally | |
1280 | * the device is moved into the up state and a %NETDEV_UP message is | |
1281 | * sent to the netdev notifier chain. | |
1282 | * | |
1283 | * Calling this function on an active interface is a nop. On a failure | |
1284 | * a negative errno code is returned. | |
1da177e4 | 1285 | */ |
bd380811 PM |
1286 | int dev_open(struct net_device *dev) |
1287 | { | |
1288 | int ret; | |
1289 | ||
bd380811 PM |
1290 | if (dev->flags & IFF_UP) |
1291 | return 0; | |
1292 | ||
bd380811 PM |
1293 | ret = __dev_open(dev); |
1294 | if (ret < 0) | |
1295 | return ret; | |
1296 | ||
7f294054 | 1297 | rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING, GFP_KERNEL); |
bd380811 PM |
1298 | call_netdevice_notifiers(NETDEV_UP, dev); |
1299 | ||
1300 | return ret; | |
1301 | } | |
1302 | EXPORT_SYMBOL(dev_open); | |
1303 | ||
44345724 | 1304 | static int __dev_close_many(struct list_head *head) |
1da177e4 | 1305 | { |
44345724 | 1306 | struct net_device *dev; |
e46b66bc | 1307 | |
bd380811 | 1308 | ASSERT_RTNL(); |
9d5010db DM |
1309 | might_sleep(); |
1310 | ||
5cde2829 | 1311 | list_for_each_entry(dev, head, close_list) { |
44345724 | 1312 | call_netdevice_notifiers(NETDEV_GOING_DOWN, dev); |
1da177e4 | 1313 | |
44345724 | 1314 | clear_bit(__LINK_STATE_START, &dev->state); |
1da177e4 | 1315 | |
44345724 OP |
1316 | /* Synchronize to scheduled poll. We cannot touch poll list, it |
1317 | * can be even on different cpu. So just clear netif_running(). | |
1318 | * | |
1319 | * dev->stop() will invoke napi_disable() on all of it's | |
1320 | * napi_struct instances on this device. | |
1321 | */ | |
1322 | smp_mb__after_clear_bit(); /* Commit netif_running(). */ | |
1323 | } | |
1da177e4 | 1324 | |
44345724 | 1325 | dev_deactivate_many(head); |
d8b2a4d2 | 1326 | |
5cde2829 | 1327 | list_for_each_entry(dev, head, close_list) { |
44345724 | 1328 | const struct net_device_ops *ops = dev->netdev_ops; |
1da177e4 | 1329 | |
44345724 OP |
1330 | /* |
1331 | * Call the device specific close. This cannot fail. | |
1332 | * Only if device is UP | |
1333 | * | |
1334 | * We allow it to be called even after a DETACH hot-plug | |
1335 | * event. | |
1336 | */ | |
1337 | if (ops->ndo_stop) | |
1338 | ops->ndo_stop(dev); | |
1339 | ||
44345724 | 1340 | dev->flags &= ~IFF_UP; |
44345724 OP |
1341 | net_dmaengine_put(); |
1342 | } | |
1343 | ||
1344 | return 0; | |
1345 | } | |
1346 | ||
1347 | static int __dev_close(struct net_device *dev) | |
1348 | { | |
f87e6f47 | 1349 | int retval; |
44345724 OP |
1350 | LIST_HEAD(single); |
1351 | ||
ca99ca14 | 1352 | /* Temporarily disable netpoll until the interface is down */ |
da6e378b | 1353 | netpoll_rx_disable(dev); |
ca99ca14 | 1354 | |
5cde2829 | 1355 | list_add(&dev->close_list, &single); |
f87e6f47 LT |
1356 | retval = __dev_close_many(&single); |
1357 | list_del(&single); | |
ca99ca14 NH |
1358 | |
1359 | netpoll_rx_enable(dev); | |
f87e6f47 | 1360 | return retval; |
44345724 OP |
1361 | } |
1362 | ||
3fbd8758 | 1363 | static int dev_close_many(struct list_head *head) |
44345724 OP |
1364 | { |
1365 | struct net_device *dev, *tmp; | |
1da177e4 | 1366 | |
5cde2829 EB |
1367 | /* Remove the devices that don't need to be closed */ |
1368 | list_for_each_entry_safe(dev, tmp, head, close_list) | |
44345724 | 1369 | if (!(dev->flags & IFF_UP)) |
5cde2829 | 1370 | list_del_init(&dev->close_list); |
44345724 OP |
1371 | |
1372 | __dev_close_many(head); | |
1da177e4 | 1373 | |
5cde2829 | 1374 | list_for_each_entry_safe(dev, tmp, head, close_list) { |
7f294054 | 1375 | rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING, GFP_KERNEL); |
44345724 | 1376 | call_netdevice_notifiers(NETDEV_DOWN, dev); |
5cde2829 | 1377 | list_del_init(&dev->close_list); |
44345724 | 1378 | } |
bd380811 PM |
1379 | |
1380 | return 0; | |
1381 | } | |
1382 | ||
1383 | /** | |
1384 | * dev_close - shutdown an interface. | |
1385 | * @dev: device to shutdown | |
1386 | * | |
1387 | * This function moves an active device into down state. A | |
1388 | * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device | |
1389 | * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier | |
1390 | * chain. | |
1391 | */ | |
1392 | int dev_close(struct net_device *dev) | |
1393 | { | |
e14a5993 ED |
1394 | if (dev->flags & IFF_UP) { |
1395 | LIST_HEAD(single); | |
1da177e4 | 1396 | |
ca99ca14 | 1397 | /* Block netpoll rx while the interface is going down */ |
da6e378b | 1398 | netpoll_rx_disable(dev); |
ca99ca14 | 1399 | |
5cde2829 | 1400 | list_add(&dev->close_list, &single); |
e14a5993 ED |
1401 | dev_close_many(&single); |
1402 | list_del(&single); | |
ca99ca14 NH |
1403 | |
1404 | netpoll_rx_enable(dev); | |
e14a5993 | 1405 | } |
da6e378b | 1406 | return 0; |
1da177e4 | 1407 | } |
d1b19dff | 1408 | EXPORT_SYMBOL(dev_close); |
1da177e4 LT |
1409 | |
1410 | ||
0187bdfb BH |
1411 | /** |
1412 | * dev_disable_lro - disable Large Receive Offload on a device | |
1413 | * @dev: device | |
1414 | * | |
1415 | * Disable Large Receive Offload (LRO) on a net device. Must be | |
1416 | * called under RTNL. This is needed if received packets may be | |
1417 | * forwarded to another interface. | |
1418 | */ | |
1419 | void dev_disable_lro(struct net_device *dev) | |
1420 | { | |
f11970e3 NH |
1421 | /* |
1422 | * If we're trying to disable lro on a vlan device | |
1423 | * use the underlying physical device instead | |
1424 | */ | |
1425 | if (is_vlan_dev(dev)) | |
1426 | dev = vlan_dev_real_dev(dev); | |
1427 | ||
529d0489 MK |
1428 | /* the same for macvlan devices */ |
1429 | if (netif_is_macvlan(dev)) | |
1430 | dev = macvlan_dev_real_dev(dev); | |
1431 | ||
bc5787c6 MM |
1432 | dev->wanted_features &= ~NETIF_F_LRO; |
1433 | netdev_update_features(dev); | |
27660515 | 1434 | |
22d5969f MM |
1435 | if (unlikely(dev->features & NETIF_F_LRO)) |
1436 | netdev_WARN(dev, "failed to disable LRO!\n"); | |
0187bdfb BH |
1437 | } |
1438 | EXPORT_SYMBOL(dev_disable_lro); | |
1439 | ||
351638e7 JP |
1440 | static int call_netdevice_notifier(struct notifier_block *nb, unsigned long val, |
1441 | struct net_device *dev) | |
1442 | { | |
1443 | struct netdev_notifier_info info; | |
1444 | ||
1445 | netdev_notifier_info_init(&info, dev); | |
1446 | return nb->notifier_call(nb, val, &info); | |
1447 | } | |
0187bdfb | 1448 | |
881d966b EB |
1449 | static int dev_boot_phase = 1; |
1450 | ||
1da177e4 LT |
1451 | /** |
1452 | * register_netdevice_notifier - register a network notifier block | |
1453 | * @nb: notifier | |
1454 | * | |
1455 | * Register a notifier to be called when network device events occur. | |
1456 | * The notifier passed is linked into the kernel structures and must | |
1457 | * not be reused until it has been unregistered. A negative errno code | |
1458 | * is returned on a failure. | |
1459 | * | |
1460 | * When registered all registration and up events are replayed | |
4ec93edb | 1461 | * to the new notifier to allow device to have a race free |
1da177e4 LT |
1462 | * view of the network device list. |
1463 | */ | |
1464 | ||
1465 | int register_netdevice_notifier(struct notifier_block *nb) | |
1466 | { | |
1467 | struct net_device *dev; | |
fcc5a03a | 1468 | struct net_device *last; |
881d966b | 1469 | struct net *net; |
1da177e4 LT |
1470 | int err; |
1471 | ||
1472 | rtnl_lock(); | |
f07d5b94 | 1473 | err = raw_notifier_chain_register(&netdev_chain, nb); |
fcc5a03a HX |
1474 | if (err) |
1475 | goto unlock; | |
881d966b EB |
1476 | if (dev_boot_phase) |
1477 | goto unlock; | |
1478 | for_each_net(net) { | |
1479 | for_each_netdev(net, dev) { | |
351638e7 | 1480 | err = call_netdevice_notifier(nb, NETDEV_REGISTER, dev); |
881d966b EB |
1481 | err = notifier_to_errno(err); |
1482 | if (err) | |
1483 | goto rollback; | |
1484 | ||
1485 | if (!(dev->flags & IFF_UP)) | |
1486 | continue; | |
1da177e4 | 1487 | |
351638e7 | 1488 | call_netdevice_notifier(nb, NETDEV_UP, dev); |
881d966b | 1489 | } |
1da177e4 | 1490 | } |
fcc5a03a HX |
1491 | |
1492 | unlock: | |
1da177e4 LT |
1493 | rtnl_unlock(); |
1494 | return err; | |
fcc5a03a HX |
1495 | |
1496 | rollback: | |
1497 | last = dev; | |
881d966b EB |
1498 | for_each_net(net) { |
1499 | for_each_netdev(net, dev) { | |
1500 | if (dev == last) | |
8f891489 | 1501 | goto outroll; |
fcc5a03a | 1502 | |
881d966b | 1503 | if (dev->flags & IFF_UP) { |
351638e7 JP |
1504 | call_netdevice_notifier(nb, NETDEV_GOING_DOWN, |
1505 | dev); | |
1506 | call_netdevice_notifier(nb, NETDEV_DOWN, dev); | |
881d966b | 1507 | } |
351638e7 | 1508 | call_netdevice_notifier(nb, NETDEV_UNREGISTER, dev); |
fcc5a03a | 1509 | } |
fcc5a03a | 1510 | } |
c67625a1 | 1511 | |
8f891489 | 1512 | outroll: |
c67625a1 | 1513 | raw_notifier_chain_unregister(&netdev_chain, nb); |
fcc5a03a | 1514 | goto unlock; |
1da177e4 | 1515 | } |
d1b19dff | 1516 | EXPORT_SYMBOL(register_netdevice_notifier); |
1da177e4 LT |
1517 | |
1518 | /** | |
1519 | * unregister_netdevice_notifier - unregister a network notifier block | |
1520 | * @nb: notifier | |
1521 | * | |
1522 | * Unregister a notifier previously registered by | |
1523 | * register_netdevice_notifier(). The notifier is unlinked into the | |
1524 | * kernel structures and may then be reused. A negative errno code | |
1525 | * is returned on a failure. | |
7d3d43da EB |
1526 | * |
1527 | * After unregistering unregister and down device events are synthesized | |
1528 | * for all devices on the device list to the removed notifier to remove | |
1529 | * the need for special case cleanup code. | |
1da177e4 LT |
1530 | */ |
1531 | ||
1532 | int unregister_netdevice_notifier(struct notifier_block *nb) | |
1533 | { | |
7d3d43da EB |
1534 | struct net_device *dev; |
1535 | struct net *net; | |
9f514950 HX |
1536 | int err; |
1537 | ||
1538 | rtnl_lock(); | |
f07d5b94 | 1539 | err = raw_notifier_chain_unregister(&netdev_chain, nb); |
7d3d43da EB |
1540 | if (err) |
1541 | goto unlock; | |
1542 | ||
1543 | for_each_net(net) { | |
1544 | for_each_netdev(net, dev) { | |
1545 | if (dev->flags & IFF_UP) { | |
351638e7 JP |
1546 | call_netdevice_notifier(nb, NETDEV_GOING_DOWN, |
1547 | dev); | |
1548 | call_netdevice_notifier(nb, NETDEV_DOWN, dev); | |
7d3d43da | 1549 | } |
351638e7 | 1550 | call_netdevice_notifier(nb, NETDEV_UNREGISTER, dev); |
7d3d43da EB |
1551 | } |
1552 | } | |
1553 | unlock: | |
9f514950 HX |
1554 | rtnl_unlock(); |
1555 | return err; | |
1da177e4 | 1556 | } |
d1b19dff | 1557 | EXPORT_SYMBOL(unregister_netdevice_notifier); |
1da177e4 | 1558 | |
351638e7 JP |
1559 | /** |
1560 | * call_netdevice_notifiers_info - call all network notifier blocks | |
1561 | * @val: value passed unmodified to notifier function | |
1562 | * @dev: net_device pointer passed unmodified to notifier function | |
1563 | * @info: notifier information data | |
1564 | * | |
1565 | * Call all network notifier blocks. Parameters and return value | |
1566 | * are as for raw_notifier_call_chain(). | |
1567 | */ | |
1568 | ||
1569 | int call_netdevice_notifiers_info(unsigned long val, struct net_device *dev, | |
1570 | struct netdev_notifier_info *info) | |
1571 | { | |
1572 | ASSERT_RTNL(); | |
1573 | netdev_notifier_info_init(info, dev); | |
1574 | return raw_notifier_call_chain(&netdev_chain, val, info); | |
1575 | } | |
1576 | EXPORT_SYMBOL(call_netdevice_notifiers_info); | |
1577 | ||
1da177e4 LT |
1578 | /** |
1579 | * call_netdevice_notifiers - call all network notifier blocks | |
1580 | * @val: value passed unmodified to notifier function | |
c4ea43c5 | 1581 | * @dev: net_device pointer passed unmodified to notifier function |
1da177e4 LT |
1582 | * |
1583 | * Call all network notifier blocks. Parameters and return value | |
f07d5b94 | 1584 | * are as for raw_notifier_call_chain(). |
1da177e4 LT |
1585 | */ |
1586 | ||
ad7379d4 | 1587 | int call_netdevice_notifiers(unsigned long val, struct net_device *dev) |
1da177e4 | 1588 | { |
351638e7 JP |
1589 | struct netdev_notifier_info info; |
1590 | ||
1591 | return call_netdevice_notifiers_info(val, dev, &info); | |
1da177e4 | 1592 | } |
edf947f1 | 1593 | EXPORT_SYMBOL(call_netdevice_notifiers); |
1da177e4 | 1594 | |
c5905afb | 1595 | static struct static_key netstamp_needed __read_mostly; |
b90e5794 | 1596 | #ifdef HAVE_JUMP_LABEL |
c5905afb | 1597 | /* We are not allowed to call static_key_slow_dec() from irq context |
b90e5794 | 1598 | * If net_disable_timestamp() is called from irq context, defer the |
c5905afb | 1599 | * static_key_slow_dec() calls. |
b90e5794 ED |
1600 | */ |
1601 | static atomic_t netstamp_needed_deferred; | |
1602 | #endif | |
1da177e4 LT |
1603 | |
1604 | void net_enable_timestamp(void) | |
1605 | { | |
b90e5794 ED |
1606 | #ifdef HAVE_JUMP_LABEL |
1607 | int deferred = atomic_xchg(&netstamp_needed_deferred, 0); | |
1608 | ||
1609 | if (deferred) { | |
1610 | while (--deferred) | |
c5905afb | 1611 | static_key_slow_dec(&netstamp_needed); |
b90e5794 ED |
1612 | return; |
1613 | } | |
1614 | #endif | |
c5905afb | 1615 | static_key_slow_inc(&netstamp_needed); |
1da177e4 | 1616 | } |
d1b19dff | 1617 | EXPORT_SYMBOL(net_enable_timestamp); |
1da177e4 LT |
1618 | |
1619 | void net_disable_timestamp(void) | |
1620 | { | |
b90e5794 ED |
1621 | #ifdef HAVE_JUMP_LABEL |
1622 | if (in_interrupt()) { | |
1623 | atomic_inc(&netstamp_needed_deferred); | |
1624 | return; | |
1625 | } | |
1626 | #endif | |
c5905afb | 1627 | static_key_slow_dec(&netstamp_needed); |
1da177e4 | 1628 | } |
d1b19dff | 1629 | EXPORT_SYMBOL(net_disable_timestamp); |
1da177e4 | 1630 | |
3b098e2d | 1631 | static inline void net_timestamp_set(struct sk_buff *skb) |
1da177e4 | 1632 | { |
588f0330 | 1633 | skb->tstamp.tv64 = 0; |
c5905afb | 1634 | if (static_key_false(&netstamp_needed)) |
a61bbcf2 | 1635 | __net_timestamp(skb); |
1da177e4 LT |
1636 | } |
1637 | ||
588f0330 | 1638 | #define net_timestamp_check(COND, SKB) \ |
c5905afb | 1639 | if (static_key_false(&netstamp_needed)) { \ |
588f0330 ED |
1640 | if ((COND) && !(SKB)->tstamp.tv64) \ |
1641 | __net_timestamp(SKB); \ | |
1642 | } \ | |
3b098e2d | 1643 | |
79b569f0 DL |
1644 | static inline bool is_skb_forwardable(struct net_device *dev, |
1645 | struct sk_buff *skb) | |
1646 | { | |
1647 | unsigned int len; | |
1648 | ||
1649 | if (!(dev->flags & IFF_UP)) | |
1650 | return false; | |
1651 | ||
1652 | len = dev->mtu + dev->hard_header_len + VLAN_HLEN; | |
1653 | if (skb->len <= len) | |
1654 | return true; | |
1655 | ||
1656 | /* if TSO is enabled, we don't care about the length as the packet | |
1657 | * could be forwarded without being segmented before | |
1658 | */ | |
1659 | if (skb_is_gso(skb)) | |
1660 | return true; | |
1661 | ||
1662 | return false; | |
1663 | } | |
1664 | ||
44540960 AB |
1665 | /** |
1666 | * dev_forward_skb - loopback an skb to another netif | |
1667 | * | |
1668 | * @dev: destination network device | |
1669 | * @skb: buffer to forward | |
1670 | * | |
1671 | * return values: | |
1672 | * NET_RX_SUCCESS (no congestion) | |
6ec82562 | 1673 | * NET_RX_DROP (packet was dropped, but freed) |
44540960 AB |
1674 | * |
1675 | * dev_forward_skb can be used for injecting an skb from the | |
1676 | * start_xmit function of one device into the receive queue | |
1677 | * of another device. | |
1678 | * | |
1679 | * The receiving device may be in another namespace, so | |
1680 | * we have to clear all information in the skb that could | |
1681 | * impact namespace isolation. | |
1682 | */ | |
1683 | int dev_forward_skb(struct net_device *dev, struct sk_buff *skb) | |
1684 | { | |
48c83012 MT |
1685 | if (skb_shinfo(skb)->tx_flags & SKBTX_DEV_ZEROCOPY) { |
1686 | if (skb_copy_ubufs(skb, GFP_ATOMIC)) { | |
1687 | atomic_long_inc(&dev->rx_dropped); | |
1688 | kfree_skb(skb); | |
1689 | return NET_RX_DROP; | |
1690 | } | |
1691 | } | |
1692 | ||
79b569f0 | 1693 | if (unlikely(!is_skb_forwardable(dev, skb))) { |
caf586e5 | 1694 | atomic_long_inc(&dev->rx_dropped); |
6ec82562 | 1695 | kfree_skb(skb); |
44540960 | 1696 | return NET_RX_DROP; |
6ec82562 | 1697 | } |
06a23fe3 | 1698 | |
8b27f277 | 1699 | skb_scrub_packet(skb, true); |
81b9eab5 | 1700 | skb->protocol = eth_type_trans(skb, dev); |
06a23fe3 | 1701 | |
44540960 AB |
1702 | return netif_rx(skb); |
1703 | } | |
1704 | EXPORT_SYMBOL_GPL(dev_forward_skb); | |
1705 | ||
71d9dec2 CG |
1706 | static inline int deliver_skb(struct sk_buff *skb, |
1707 | struct packet_type *pt_prev, | |
1708 | struct net_device *orig_dev) | |
1709 | { | |
1080e512 MT |
1710 | if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC))) |
1711 | return -ENOMEM; | |
71d9dec2 CG |
1712 | atomic_inc(&skb->users); |
1713 | return pt_prev->func(skb, skb->dev, pt_prev, orig_dev); | |
1714 | } | |
1715 | ||
c0de08d0 EL |
1716 | static inline bool skb_loop_sk(struct packet_type *ptype, struct sk_buff *skb) |
1717 | { | |
a3d744e9 | 1718 | if (!ptype->af_packet_priv || !skb->sk) |
c0de08d0 EL |
1719 | return false; |
1720 | ||
1721 | if (ptype->id_match) | |
1722 | return ptype->id_match(ptype, skb->sk); | |
1723 | else if ((struct sock *)ptype->af_packet_priv == skb->sk) | |
1724 | return true; | |
1725 | ||
1726 | return false; | |
1727 | } | |
1728 | ||
1da177e4 LT |
1729 | /* |
1730 | * Support routine. Sends outgoing frames to any network | |
1731 | * taps currently in use. | |
1732 | */ | |
1733 | ||
f6a78bfc | 1734 | static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
1735 | { |
1736 | struct packet_type *ptype; | |
71d9dec2 CG |
1737 | struct sk_buff *skb2 = NULL; |
1738 | struct packet_type *pt_prev = NULL; | |
a61bbcf2 | 1739 | |
1da177e4 LT |
1740 | rcu_read_lock(); |
1741 | list_for_each_entry_rcu(ptype, &ptype_all, list) { | |
1742 | /* Never send packets back to the socket | |
1743 | * they originated from - MvS (miquels@drinkel.ow.org) | |
1744 | */ | |
1745 | if ((ptype->dev == dev || !ptype->dev) && | |
c0de08d0 | 1746 | (!skb_loop_sk(ptype, skb))) { |
71d9dec2 CG |
1747 | if (pt_prev) { |
1748 | deliver_skb(skb2, pt_prev, skb->dev); | |
1749 | pt_prev = ptype; | |
1750 | continue; | |
1751 | } | |
1752 | ||
1753 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1da177e4 LT |
1754 | if (!skb2) |
1755 | break; | |
1756 | ||
70978182 ED |
1757 | net_timestamp_set(skb2); |
1758 | ||
1da177e4 LT |
1759 | /* skb->nh should be correctly |
1760 | set by sender, so that the second statement is | |
1761 | just protection against buggy protocols. | |
1762 | */ | |
459a98ed | 1763 | skb_reset_mac_header(skb2); |
1da177e4 | 1764 | |
d56f90a7 | 1765 | if (skb_network_header(skb2) < skb2->data || |
ced14f68 | 1766 | skb_network_header(skb2) > skb_tail_pointer(skb2)) { |
e87cc472 JP |
1767 | net_crit_ratelimited("protocol %04x is buggy, dev %s\n", |
1768 | ntohs(skb2->protocol), | |
1769 | dev->name); | |
c1d2bbe1 | 1770 | skb_reset_network_header(skb2); |
1da177e4 LT |
1771 | } |
1772 | ||
b0e380b1 | 1773 | skb2->transport_header = skb2->network_header; |
1da177e4 | 1774 | skb2->pkt_type = PACKET_OUTGOING; |
71d9dec2 | 1775 | pt_prev = ptype; |
1da177e4 LT |
1776 | } |
1777 | } | |
71d9dec2 CG |
1778 | if (pt_prev) |
1779 | pt_prev->func(skb2, skb->dev, pt_prev, skb->dev); | |
1da177e4 LT |
1780 | rcu_read_unlock(); |
1781 | } | |
1782 | ||
2c53040f BH |
1783 | /** |
1784 | * netif_setup_tc - Handle tc mappings on real_num_tx_queues change | |
4f57c087 JF |
1785 | * @dev: Network device |
1786 | * @txq: number of queues available | |
1787 | * | |
1788 | * If real_num_tx_queues is changed the tc mappings may no longer be | |
1789 | * valid. To resolve this verify the tc mapping remains valid and if | |
1790 | * not NULL the mapping. With no priorities mapping to this | |
1791 | * offset/count pair it will no longer be used. In the worst case TC0 | |
1792 | * is invalid nothing can be done so disable priority mappings. If is | |
1793 | * expected that drivers will fix this mapping if they can before | |
1794 | * calling netif_set_real_num_tx_queues. | |
1795 | */ | |
bb134d22 | 1796 | static void netif_setup_tc(struct net_device *dev, unsigned int txq) |
4f57c087 JF |
1797 | { |
1798 | int i; | |
1799 | struct netdev_tc_txq *tc = &dev->tc_to_txq[0]; | |
1800 | ||
1801 | /* If TC0 is invalidated disable TC mapping */ | |
1802 | if (tc->offset + tc->count > txq) { | |
7b6cd1ce | 1803 | pr_warn("Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n"); |
4f57c087 JF |
1804 | dev->num_tc = 0; |
1805 | return; | |
1806 | } | |
1807 | ||
1808 | /* Invalidated prio to tc mappings set to TC0 */ | |
1809 | for (i = 1; i < TC_BITMASK + 1; i++) { | |
1810 | int q = netdev_get_prio_tc_map(dev, i); | |
1811 | ||
1812 | tc = &dev->tc_to_txq[q]; | |
1813 | if (tc->offset + tc->count > txq) { | |
7b6cd1ce JP |
1814 | pr_warn("Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n", |
1815 | i, q); | |
4f57c087 JF |
1816 | netdev_set_prio_tc_map(dev, i, 0); |
1817 | } | |
1818 | } | |
1819 | } | |
1820 | ||
537c00de AD |
1821 | #ifdef CONFIG_XPS |
1822 | static DEFINE_MUTEX(xps_map_mutex); | |
1823 | #define xmap_dereference(P) \ | |
1824 | rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex)) | |
1825 | ||
10cdc3f3 AD |
1826 | static struct xps_map *remove_xps_queue(struct xps_dev_maps *dev_maps, |
1827 | int cpu, u16 index) | |
537c00de | 1828 | { |
10cdc3f3 AD |
1829 | struct xps_map *map = NULL; |
1830 | int pos; | |
537c00de | 1831 | |
10cdc3f3 AD |
1832 | if (dev_maps) |
1833 | map = xmap_dereference(dev_maps->cpu_map[cpu]); | |
537c00de | 1834 | |
10cdc3f3 AD |
1835 | for (pos = 0; map && pos < map->len; pos++) { |
1836 | if (map->queues[pos] == index) { | |
537c00de AD |
1837 | if (map->len > 1) { |
1838 | map->queues[pos] = map->queues[--map->len]; | |
1839 | } else { | |
10cdc3f3 | 1840 | RCU_INIT_POINTER(dev_maps->cpu_map[cpu], NULL); |
537c00de AD |
1841 | kfree_rcu(map, rcu); |
1842 | map = NULL; | |
1843 | } | |
10cdc3f3 | 1844 | break; |
537c00de | 1845 | } |
537c00de AD |
1846 | } |
1847 | ||
10cdc3f3 AD |
1848 | return map; |
1849 | } | |
1850 | ||
024e9679 | 1851 | static void netif_reset_xps_queues_gt(struct net_device *dev, u16 index) |
10cdc3f3 AD |
1852 | { |
1853 | struct xps_dev_maps *dev_maps; | |
024e9679 | 1854 | int cpu, i; |
10cdc3f3 AD |
1855 | bool active = false; |
1856 | ||
1857 | mutex_lock(&xps_map_mutex); | |
1858 | dev_maps = xmap_dereference(dev->xps_maps); | |
1859 | ||
1860 | if (!dev_maps) | |
1861 | goto out_no_maps; | |
1862 | ||
1863 | for_each_possible_cpu(cpu) { | |
024e9679 AD |
1864 | for (i = index; i < dev->num_tx_queues; i++) { |
1865 | if (!remove_xps_queue(dev_maps, cpu, i)) | |
1866 | break; | |
1867 | } | |
1868 | if (i == dev->num_tx_queues) | |
10cdc3f3 AD |
1869 | active = true; |
1870 | } | |
1871 | ||
1872 | if (!active) { | |
537c00de AD |
1873 | RCU_INIT_POINTER(dev->xps_maps, NULL); |
1874 | kfree_rcu(dev_maps, rcu); | |
1875 | } | |
1876 | ||
024e9679 AD |
1877 | for (i = index; i < dev->num_tx_queues; i++) |
1878 | netdev_queue_numa_node_write(netdev_get_tx_queue(dev, i), | |
1879 | NUMA_NO_NODE); | |
1880 | ||
537c00de AD |
1881 | out_no_maps: |
1882 | mutex_unlock(&xps_map_mutex); | |
1883 | } | |
1884 | ||
01c5f864 AD |
1885 | static struct xps_map *expand_xps_map(struct xps_map *map, |
1886 | int cpu, u16 index) | |
1887 | { | |
1888 | struct xps_map *new_map; | |
1889 | int alloc_len = XPS_MIN_MAP_ALLOC; | |
1890 | int i, pos; | |
1891 | ||
1892 | for (pos = 0; map && pos < map->len; pos++) { | |
1893 | if (map->queues[pos] != index) | |
1894 | continue; | |
1895 | return map; | |
1896 | } | |
1897 | ||
1898 | /* Need to add queue to this CPU's existing map */ | |
1899 | if (map) { | |
1900 | if (pos < map->alloc_len) | |
1901 | return map; | |
1902 | ||
1903 | alloc_len = map->alloc_len * 2; | |
1904 | } | |
1905 | ||
1906 | /* Need to allocate new map to store queue on this CPU's map */ | |
1907 | new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len), GFP_KERNEL, | |
1908 | cpu_to_node(cpu)); | |
1909 | if (!new_map) | |
1910 | return NULL; | |
1911 | ||
1912 | for (i = 0; i < pos; i++) | |
1913 | new_map->queues[i] = map->queues[i]; | |
1914 | new_map->alloc_len = alloc_len; | |
1915 | new_map->len = pos; | |
1916 | ||
1917 | return new_map; | |
1918 | } | |
1919 | ||
3573540c MT |
1920 | int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask, |
1921 | u16 index) | |
537c00de | 1922 | { |
01c5f864 | 1923 | struct xps_dev_maps *dev_maps, *new_dev_maps = NULL; |
537c00de | 1924 | struct xps_map *map, *new_map; |
537c00de | 1925 | int maps_sz = max_t(unsigned int, XPS_DEV_MAPS_SIZE, L1_CACHE_BYTES); |
01c5f864 AD |
1926 | int cpu, numa_node_id = -2; |
1927 | bool active = false; | |
537c00de AD |
1928 | |
1929 | mutex_lock(&xps_map_mutex); | |
1930 | ||
1931 | dev_maps = xmap_dereference(dev->xps_maps); | |
1932 | ||
01c5f864 AD |
1933 | /* allocate memory for queue storage */ |
1934 | for_each_online_cpu(cpu) { | |
1935 | if (!cpumask_test_cpu(cpu, mask)) | |
1936 | continue; | |
1937 | ||
1938 | if (!new_dev_maps) | |
1939 | new_dev_maps = kzalloc(maps_sz, GFP_KERNEL); | |
2bb60cb9 AD |
1940 | if (!new_dev_maps) { |
1941 | mutex_unlock(&xps_map_mutex); | |
01c5f864 | 1942 | return -ENOMEM; |
2bb60cb9 | 1943 | } |
01c5f864 AD |
1944 | |
1945 | map = dev_maps ? xmap_dereference(dev_maps->cpu_map[cpu]) : | |
1946 | NULL; | |
1947 | ||
1948 | map = expand_xps_map(map, cpu, index); | |
1949 | if (!map) | |
1950 | goto error; | |
1951 | ||
1952 | RCU_INIT_POINTER(new_dev_maps->cpu_map[cpu], map); | |
1953 | } | |
1954 | ||
1955 | if (!new_dev_maps) | |
1956 | goto out_no_new_maps; | |
1957 | ||
537c00de | 1958 | for_each_possible_cpu(cpu) { |
01c5f864 AD |
1959 | if (cpumask_test_cpu(cpu, mask) && cpu_online(cpu)) { |
1960 | /* add queue to CPU maps */ | |
1961 | int pos = 0; | |
1962 | ||
1963 | map = xmap_dereference(new_dev_maps->cpu_map[cpu]); | |
1964 | while ((pos < map->len) && (map->queues[pos] != index)) | |
1965 | pos++; | |
1966 | ||
1967 | if (pos == map->len) | |
1968 | map->queues[map->len++] = index; | |
537c00de | 1969 | #ifdef CONFIG_NUMA |
537c00de AD |
1970 | if (numa_node_id == -2) |
1971 | numa_node_id = cpu_to_node(cpu); | |
1972 | else if (numa_node_id != cpu_to_node(cpu)) | |
1973 | numa_node_id = -1; | |
537c00de | 1974 | #endif |
01c5f864 AD |
1975 | } else if (dev_maps) { |
1976 | /* fill in the new device map from the old device map */ | |
1977 | map = xmap_dereference(dev_maps->cpu_map[cpu]); | |
1978 | RCU_INIT_POINTER(new_dev_maps->cpu_map[cpu], map); | |
537c00de | 1979 | } |
01c5f864 | 1980 | |
537c00de AD |
1981 | } |
1982 | ||
01c5f864 AD |
1983 | rcu_assign_pointer(dev->xps_maps, new_dev_maps); |
1984 | ||
537c00de | 1985 | /* Cleanup old maps */ |
01c5f864 AD |
1986 | if (dev_maps) { |
1987 | for_each_possible_cpu(cpu) { | |
1988 | new_map = xmap_dereference(new_dev_maps->cpu_map[cpu]); | |
1989 | map = xmap_dereference(dev_maps->cpu_map[cpu]); | |
1990 | if (map && map != new_map) | |
1991 | kfree_rcu(map, rcu); | |
1992 | } | |
537c00de | 1993 | |
01c5f864 | 1994 | kfree_rcu(dev_maps, rcu); |
537c00de AD |
1995 | } |
1996 | ||
01c5f864 AD |
1997 | dev_maps = new_dev_maps; |
1998 | active = true; | |
537c00de | 1999 | |
01c5f864 AD |
2000 | out_no_new_maps: |
2001 | /* update Tx queue numa node */ | |
537c00de AD |
2002 | netdev_queue_numa_node_write(netdev_get_tx_queue(dev, index), |
2003 | (numa_node_id >= 0) ? numa_node_id : | |
2004 | NUMA_NO_NODE); | |
2005 | ||
01c5f864 AD |
2006 | if (!dev_maps) |
2007 | goto out_no_maps; | |
2008 | ||
2009 | /* removes queue from unused CPUs */ | |
2010 | for_each_possible_cpu(cpu) { | |
2011 | if (cpumask_test_cpu(cpu, mask) && cpu_online(cpu)) | |
2012 | continue; | |
2013 | ||
2014 | if (remove_xps_queue(dev_maps, cpu, index)) | |
2015 | active = true; | |
2016 | } | |
2017 | ||
2018 | /* free map if not active */ | |
2019 | if (!active) { | |
2020 | RCU_INIT_POINTER(dev->xps_maps, NULL); | |
2021 | kfree_rcu(dev_maps, rcu); | |
2022 | } | |
2023 | ||
2024 | out_no_maps: | |
537c00de AD |
2025 | mutex_unlock(&xps_map_mutex); |
2026 | ||
2027 | return 0; | |
2028 | error: | |
01c5f864 AD |
2029 | /* remove any maps that we added */ |
2030 | for_each_possible_cpu(cpu) { | |
2031 | new_map = xmap_dereference(new_dev_maps->cpu_map[cpu]); | |
2032 | map = dev_maps ? xmap_dereference(dev_maps->cpu_map[cpu]) : | |
2033 | NULL; | |
2034 | if (new_map && new_map != map) | |
2035 | kfree(new_map); | |
2036 | } | |
2037 | ||
537c00de AD |
2038 | mutex_unlock(&xps_map_mutex); |
2039 | ||
537c00de AD |
2040 | kfree(new_dev_maps); |
2041 | return -ENOMEM; | |
2042 | } | |
2043 | EXPORT_SYMBOL(netif_set_xps_queue); | |
2044 | ||
2045 | #endif | |
f0796d5c JF |
2046 | /* |
2047 | * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues | |
2048 | * greater then real_num_tx_queues stale skbs on the qdisc must be flushed. | |
2049 | */ | |
e6484930 | 2050 | int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq) |
f0796d5c | 2051 | { |
1d24eb48 TH |
2052 | int rc; |
2053 | ||
e6484930 TH |
2054 | if (txq < 1 || txq > dev->num_tx_queues) |
2055 | return -EINVAL; | |
f0796d5c | 2056 | |
5c56580b BH |
2057 | if (dev->reg_state == NETREG_REGISTERED || |
2058 | dev->reg_state == NETREG_UNREGISTERING) { | |
e6484930 TH |
2059 | ASSERT_RTNL(); |
2060 | ||
1d24eb48 TH |
2061 | rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues, |
2062 | txq); | |
bf264145 TH |
2063 | if (rc) |
2064 | return rc; | |
2065 | ||
4f57c087 JF |
2066 | if (dev->num_tc) |
2067 | netif_setup_tc(dev, txq); | |
2068 | ||
024e9679 | 2069 | if (txq < dev->real_num_tx_queues) { |
e6484930 | 2070 | qdisc_reset_all_tx_gt(dev, txq); |
024e9679 AD |
2071 | #ifdef CONFIG_XPS |
2072 | netif_reset_xps_queues_gt(dev, txq); | |
2073 | #endif | |
2074 | } | |
f0796d5c | 2075 | } |
e6484930 TH |
2076 | |
2077 | dev->real_num_tx_queues = txq; | |
2078 | return 0; | |
f0796d5c JF |
2079 | } |
2080 | EXPORT_SYMBOL(netif_set_real_num_tx_queues); | |
56079431 | 2081 | |
62fe0b40 BH |
2082 | #ifdef CONFIG_RPS |
2083 | /** | |
2084 | * netif_set_real_num_rx_queues - set actual number of RX queues used | |
2085 | * @dev: Network device | |
2086 | * @rxq: Actual number of RX queues | |
2087 | * | |
2088 | * This must be called either with the rtnl_lock held or before | |
2089 | * registration of the net device. Returns 0 on success, or a | |
4e7f7951 BH |
2090 | * negative error code. If called before registration, it always |
2091 | * succeeds. | |
62fe0b40 BH |
2092 | */ |
2093 | int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq) | |
2094 | { | |
2095 | int rc; | |
2096 | ||
bd25fa7b TH |
2097 | if (rxq < 1 || rxq > dev->num_rx_queues) |
2098 | return -EINVAL; | |
2099 | ||
62fe0b40 BH |
2100 | if (dev->reg_state == NETREG_REGISTERED) { |
2101 | ASSERT_RTNL(); | |
2102 | ||
62fe0b40 BH |
2103 | rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues, |
2104 | rxq); | |
2105 | if (rc) | |
2106 | return rc; | |
62fe0b40 BH |
2107 | } |
2108 | ||
2109 | dev->real_num_rx_queues = rxq; | |
2110 | return 0; | |
2111 | } | |
2112 | EXPORT_SYMBOL(netif_set_real_num_rx_queues); | |
2113 | #endif | |
2114 | ||
2c53040f BH |
2115 | /** |
2116 | * netif_get_num_default_rss_queues - default number of RSS queues | |
16917b87 YM |
2117 | * |
2118 | * This routine should set an upper limit on the number of RSS queues | |
2119 | * used by default by multiqueue devices. | |
2120 | */ | |
a55b138b | 2121 | int netif_get_num_default_rss_queues(void) |
16917b87 YM |
2122 | { |
2123 | return min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES, num_online_cpus()); | |
2124 | } | |
2125 | EXPORT_SYMBOL(netif_get_num_default_rss_queues); | |
2126 | ||
def82a1d | 2127 | static inline void __netif_reschedule(struct Qdisc *q) |
56079431 | 2128 | { |
def82a1d JP |
2129 | struct softnet_data *sd; |
2130 | unsigned long flags; | |
56079431 | 2131 | |
def82a1d JP |
2132 | local_irq_save(flags); |
2133 | sd = &__get_cpu_var(softnet_data); | |
a9cbd588 CG |
2134 | q->next_sched = NULL; |
2135 | *sd->output_queue_tailp = q; | |
2136 | sd->output_queue_tailp = &q->next_sched; | |
def82a1d JP |
2137 | raise_softirq_irqoff(NET_TX_SOFTIRQ); |
2138 | local_irq_restore(flags); | |
2139 | } | |
2140 | ||
2141 | void __netif_schedule(struct Qdisc *q) | |
2142 | { | |
2143 | if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state)) | |
2144 | __netif_reschedule(q); | |
56079431 DV |
2145 | } |
2146 | EXPORT_SYMBOL(__netif_schedule); | |
2147 | ||
e6247027 ED |
2148 | struct dev_kfree_skb_cb { |
2149 | enum skb_free_reason reason; | |
2150 | }; | |
2151 | ||
2152 | static struct dev_kfree_skb_cb *get_kfree_skb_cb(const struct sk_buff *skb) | |
2153 | { | |
2154 | return (struct dev_kfree_skb_cb *)skb->cb; | |
2155 | } | |
2156 | ||
2157 | void __dev_kfree_skb_irq(struct sk_buff *skb, enum skb_free_reason reason) | |
56079431 | 2158 | { |
e6247027 | 2159 | unsigned long flags; |
56079431 | 2160 | |
e6247027 ED |
2161 | if (likely(atomic_read(&skb->users) == 1)) { |
2162 | smp_rmb(); | |
2163 | atomic_set(&skb->users, 0); | |
2164 | } else if (likely(!atomic_dec_and_test(&skb->users))) { | |
2165 | return; | |
bea3348e | 2166 | } |
e6247027 ED |
2167 | get_kfree_skb_cb(skb)->reason = reason; |
2168 | local_irq_save(flags); | |
2169 | skb->next = __this_cpu_read(softnet_data.completion_queue); | |
2170 | __this_cpu_write(softnet_data.completion_queue, skb); | |
2171 | raise_softirq_irqoff(NET_TX_SOFTIRQ); | |
2172 | local_irq_restore(flags); | |
56079431 | 2173 | } |
e6247027 | 2174 | EXPORT_SYMBOL(__dev_kfree_skb_irq); |
56079431 | 2175 | |
e6247027 | 2176 | void __dev_kfree_skb_any(struct sk_buff *skb, enum skb_free_reason reason) |
56079431 DV |
2177 | { |
2178 | if (in_irq() || irqs_disabled()) | |
e6247027 | 2179 | __dev_kfree_skb_irq(skb, reason); |
56079431 DV |
2180 | else |
2181 | dev_kfree_skb(skb); | |
2182 | } | |
e6247027 | 2183 | EXPORT_SYMBOL(__dev_kfree_skb_any); |
56079431 DV |
2184 | |
2185 | ||
bea3348e SH |
2186 | /** |
2187 | * netif_device_detach - mark device as removed | |
2188 | * @dev: network device | |
2189 | * | |
2190 | * Mark device as removed from system and therefore no longer available. | |
2191 | */ | |
56079431 DV |
2192 | void netif_device_detach(struct net_device *dev) |
2193 | { | |
2194 | if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) && | |
2195 | netif_running(dev)) { | |
d543103a | 2196 | netif_tx_stop_all_queues(dev); |
56079431 DV |
2197 | } |
2198 | } | |
2199 | EXPORT_SYMBOL(netif_device_detach); | |
2200 | ||
bea3348e SH |
2201 | /** |
2202 | * netif_device_attach - mark device as attached | |
2203 | * @dev: network device | |
2204 | * | |
2205 | * Mark device as attached from system and restart if needed. | |
2206 | */ | |
56079431 DV |
2207 | void netif_device_attach(struct net_device *dev) |
2208 | { | |
2209 | if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) && | |
2210 | netif_running(dev)) { | |
d543103a | 2211 | netif_tx_wake_all_queues(dev); |
4ec93edb | 2212 | __netdev_watchdog_up(dev); |
56079431 DV |
2213 | } |
2214 | } | |
2215 | EXPORT_SYMBOL(netif_device_attach); | |
2216 | ||
36c92474 BH |
2217 | static void skb_warn_bad_offload(const struct sk_buff *skb) |
2218 | { | |
65e9d2fa | 2219 | static const netdev_features_t null_features = 0; |
36c92474 BH |
2220 | struct net_device *dev = skb->dev; |
2221 | const char *driver = ""; | |
2222 | ||
c846ad9b BG |
2223 | if (!net_ratelimit()) |
2224 | return; | |
2225 | ||
36c92474 BH |
2226 | if (dev && dev->dev.parent) |
2227 | driver = dev_driver_string(dev->dev.parent); | |
2228 | ||
2229 | WARN(1, "%s: caps=(%pNF, %pNF) len=%d data_len=%d gso_size=%d " | |
2230 | "gso_type=%d ip_summed=%d\n", | |
65e9d2fa MM |
2231 | driver, dev ? &dev->features : &null_features, |
2232 | skb->sk ? &skb->sk->sk_route_caps : &null_features, | |
36c92474 BH |
2233 | skb->len, skb->data_len, skb_shinfo(skb)->gso_size, |
2234 | skb_shinfo(skb)->gso_type, skb->ip_summed); | |
2235 | } | |
2236 | ||
1da177e4 LT |
2237 | /* |
2238 | * Invalidate hardware checksum when packet is to be mangled, and | |
2239 | * complete checksum manually on outgoing path. | |
2240 | */ | |
84fa7933 | 2241 | int skb_checksum_help(struct sk_buff *skb) |
1da177e4 | 2242 | { |
d3bc23e7 | 2243 | __wsum csum; |
663ead3b | 2244 | int ret = 0, offset; |
1da177e4 | 2245 | |
84fa7933 | 2246 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
a430a43d HX |
2247 | goto out_set_summed; |
2248 | ||
2249 | if (unlikely(skb_shinfo(skb)->gso_size)) { | |
36c92474 BH |
2250 | skb_warn_bad_offload(skb); |
2251 | return -EINVAL; | |
1da177e4 LT |
2252 | } |
2253 | ||
cef401de ED |
2254 | /* Before computing a checksum, we should make sure no frag could |
2255 | * be modified by an external entity : checksum could be wrong. | |
2256 | */ | |
2257 | if (skb_has_shared_frag(skb)) { | |
2258 | ret = __skb_linearize(skb); | |
2259 | if (ret) | |
2260 | goto out; | |
2261 | } | |
2262 | ||
55508d60 | 2263 | offset = skb_checksum_start_offset(skb); |
a030847e HX |
2264 | BUG_ON(offset >= skb_headlen(skb)); |
2265 | csum = skb_checksum(skb, offset, skb->len - offset, 0); | |
2266 | ||
2267 | offset += skb->csum_offset; | |
2268 | BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb)); | |
2269 | ||
2270 | if (skb_cloned(skb) && | |
2271 | !skb_clone_writable(skb, offset + sizeof(__sum16))) { | |
1da177e4 LT |
2272 | ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC); |
2273 | if (ret) | |
2274 | goto out; | |
2275 | } | |
2276 | ||
a030847e | 2277 | *(__sum16 *)(skb->data + offset) = csum_fold(csum); |
a430a43d | 2278 | out_set_summed: |
1da177e4 | 2279 | skb->ip_summed = CHECKSUM_NONE; |
4ec93edb | 2280 | out: |
1da177e4 LT |
2281 | return ret; |
2282 | } | |
d1b19dff | 2283 | EXPORT_SYMBOL(skb_checksum_help); |
1da177e4 | 2284 | |
ec5f0615 | 2285 | __be16 skb_network_protocol(struct sk_buff *skb) |
f6a78bfc | 2286 | { |
252e3346 | 2287 | __be16 type = skb->protocol; |
c80a8512 | 2288 | int vlan_depth = ETH_HLEN; |
f6a78bfc | 2289 | |
19acc327 PS |
2290 | /* Tunnel gso handlers can set protocol to ethernet. */ |
2291 | if (type == htons(ETH_P_TEB)) { | |
2292 | struct ethhdr *eth; | |
2293 | ||
2294 | if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr)))) | |
2295 | return 0; | |
2296 | ||
2297 | eth = (struct ethhdr *)skb_mac_header(skb); | |
2298 | type = eth->h_proto; | |
2299 | } | |
2300 | ||
8ad227ff | 2301 | while (type == htons(ETH_P_8021Q) || type == htons(ETH_P_8021AD)) { |
c8d5bcd1 | 2302 | struct vlan_hdr *vh; |
7b9c6090 | 2303 | |
c8d5bcd1 | 2304 | if (unlikely(!pskb_may_pull(skb, vlan_depth + VLAN_HLEN))) |
ec5f0615 | 2305 | return 0; |
7b9c6090 | 2306 | |
c8d5bcd1 JG |
2307 | vh = (struct vlan_hdr *)(skb->data + vlan_depth); |
2308 | type = vh->h_vlan_encapsulated_proto; | |
2309 | vlan_depth += VLAN_HLEN; | |
7b9c6090 JG |
2310 | } |
2311 | ||
ec5f0615 PS |
2312 | return type; |
2313 | } | |
2314 | ||
2315 | /** | |
2316 | * skb_mac_gso_segment - mac layer segmentation handler. | |
2317 | * @skb: buffer to segment | |
2318 | * @features: features for the output path (see dev->features) | |
2319 | */ | |
2320 | struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb, | |
2321 | netdev_features_t features) | |
2322 | { | |
2323 | struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT); | |
2324 | struct packet_offload *ptype; | |
2325 | __be16 type = skb_network_protocol(skb); | |
2326 | ||
2327 | if (unlikely(!type)) | |
2328 | return ERR_PTR(-EINVAL); | |
2329 | ||
f6a78bfc HX |
2330 | __skb_pull(skb, skb->mac_len); |
2331 | ||
2332 | rcu_read_lock(); | |
22061d80 | 2333 | list_for_each_entry_rcu(ptype, &offload_base, list) { |
f191a1d1 | 2334 | if (ptype->type == type && ptype->callbacks.gso_segment) { |
84fa7933 | 2335 | if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) { |
05e8ef4a PS |
2336 | int err; |
2337 | ||
f191a1d1 | 2338 | err = ptype->callbacks.gso_send_check(skb); |
a430a43d HX |
2339 | segs = ERR_PTR(err); |
2340 | if (err || skb_gso_ok(skb, features)) | |
2341 | break; | |
d56f90a7 ACM |
2342 | __skb_push(skb, (skb->data - |
2343 | skb_network_header(skb))); | |
a430a43d | 2344 | } |
f191a1d1 | 2345 | segs = ptype->callbacks.gso_segment(skb, features); |
f6a78bfc HX |
2346 | break; |
2347 | } | |
2348 | } | |
2349 | rcu_read_unlock(); | |
2350 | ||
98e399f8 | 2351 | __skb_push(skb, skb->data - skb_mac_header(skb)); |
576a30eb | 2352 | |
f6a78bfc HX |
2353 | return segs; |
2354 | } | |
05e8ef4a PS |
2355 | EXPORT_SYMBOL(skb_mac_gso_segment); |
2356 | ||
2357 | ||
2358 | /* openvswitch calls this on rx path, so we need a different check. | |
2359 | */ | |
2360 | static inline bool skb_needs_check(struct sk_buff *skb, bool tx_path) | |
2361 | { | |
2362 | if (tx_path) | |
2363 | return skb->ip_summed != CHECKSUM_PARTIAL; | |
2364 | else | |
2365 | return skb->ip_summed == CHECKSUM_NONE; | |
2366 | } | |
2367 | ||
2368 | /** | |
2369 | * __skb_gso_segment - Perform segmentation on skb. | |
2370 | * @skb: buffer to segment | |
2371 | * @features: features for the output path (see dev->features) | |
2372 | * @tx_path: whether it is called in TX path | |
2373 | * | |
2374 | * This function segments the given skb and returns a list of segments. | |
2375 | * | |
2376 | * It may return NULL if the skb requires no segmentation. This is | |
2377 | * only possible when GSO is used for verifying header integrity. | |
2378 | */ | |
2379 | struct sk_buff *__skb_gso_segment(struct sk_buff *skb, | |
2380 | netdev_features_t features, bool tx_path) | |
2381 | { | |
2382 | if (unlikely(skb_needs_check(skb, tx_path))) { | |
2383 | int err; | |
2384 | ||
2385 | skb_warn_bad_offload(skb); | |
2386 | ||
2387 | if (skb_header_cloned(skb) && | |
2388 | (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC))) | |
2389 | return ERR_PTR(err); | |
2390 | } | |
2391 | ||
68c33163 | 2392 | SKB_GSO_CB(skb)->mac_offset = skb_headroom(skb); |
3347c960 ED |
2393 | SKB_GSO_CB(skb)->encap_level = 0; |
2394 | ||
05e8ef4a PS |
2395 | skb_reset_mac_header(skb); |
2396 | skb_reset_mac_len(skb); | |
2397 | ||
2398 | return skb_mac_gso_segment(skb, features); | |
2399 | } | |
12b0004d | 2400 | EXPORT_SYMBOL(__skb_gso_segment); |
f6a78bfc | 2401 | |
fb286bb2 HX |
2402 | /* Take action when hardware reception checksum errors are detected. */ |
2403 | #ifdef CONFIG_BUG | |
2404 | void netdev_rx_csum_fault(struct net_device *dev) | |
2405 | { | |
2406 | if (net_ratelimit()) { | |
7b6cd1ce | 2407 | pr_err("%s: hw csum failure\n", dev ? dev->name : "<unknown>"); |
fb286bb2 HX |
2408 | dump_stack(); |
2409 | } | |
2410 | } | |
2411 | EXPORT_SYMBOL(netdev_rx_csum_fault); | |
2412 | #endif | |
2413 | ||
1da177e4 LT |
2414 | /* Actually, we should eliminate this check as soon as we know, that: |
2415 | * 1. IOMMU is present and allows to map all the memory. | |
2416 | * 2. No high memory really exists on this machine. | |
2417 | */ | |
2418 | ||
9092c658 | 2419 | static int illegal_highdma(struct net_device *dev, struct sk_buff *skb) |
1da177e4 | 2420 | { |
3d3a8533 | 2421 | #ifdef CONFIG_HIGHMEM |
1da177e4 | 2422 | int i; |
5acbbd42 | 2423 | if (!(dev->features & NETIF_F_HIGHDMA)) { |
ea2ab693 IC |
2424 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { |
2425 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; | |
2426 | if (PageHighMem(skb_frag_page(frag))) | |
5acbbd42 | 2427 | return 1; |
ea2ab693 | 2428 | } |
5acbbd42 | 2429 | } |
1da177e4 | 2430 | |
5acbbd42 FT |
2431 | if (PCI_DMA_BUS_IS_PHYS) { |
2432 | struct device *pdev = dev->dev.parent; | |
1da177e4 | 2433 | |
9092c658 ED |
2434 | if (!pdev) |
2435 | return 0; | |
5acbbd42 | 2436 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { |
ea2ab693 IC |
2437 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; |
2438 | dma_addr_t addr = page_to_phys(skb_frag_page(frag)); | |
5acbbd42 FT |
2439 | if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask) |
2440 | return 1; | |
2441 | } | |
2442 | } | |
3d3a8533 | 2443 | #endif |
1da177e4 LT |
2444 | return 0; |
2445 | } | |
1da177e4 | 2446 | |
f6a78bfc HX |
2447 | struct dev_gso_cb { |
2448 | void (*destructor)(struct sk_buff *skb); | |
2449 | }; | |
2450 | ||
2451 | #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb) | |
2452 | ||
2453 | static void dev_gso_skb_destructor(struct sk_buff *skb) | |
2454 | { | |
2455 | struct dev_gso_cb *cb; | |
2456 | ||
2457 | do { | |
2458 | struct sk_buff *nskb = skb->next; | |
2459 | ||
2460 | skb->next = nskb->next; | |
2461 | nskb->next = NULL; | |
2462 | kfree_skb(nskb); | |
2463 | } while (skb->next); | |
2464 | ||
2465 | cb = DEV_GSO_CB(skb); | |
2466 | if (cb->destructor) | |
2467 | cb->destructor(skb); | |
2468 | } | |
2469 | ||
2470 | /** | |
2471 | * dev_gso_segment - Perform emulated hardware segmentation on skb. | |
2472 | * @skb: buffer to segment | |
91ecb63c | 2473 | * @features: device features as applicable to this skb |
f6a78bfc HX |
2474 | * |
2475 | * This function segments the given skb and stores the list of segments | |
2476 | * in skb->next. | |
2477 | */ | |
c8f44aff | 2478 | static int dev_gso_segment(struct sk_buff *skb, netdev_features_t features) |
f6a78bfc | 2479 | { |
f6a78bfc | 2480 | struct sk_buff *segs; |
576a30eb HX |
2481 | |
2482 | segs = skb_gso_segment(skb, features); | |
2483 | ||
2484 | /* Verifying header integrity only. */ | |
2485 | if (!segs) | |
2486 | return 0; | |
f6a78bfc | 2487 | |
801678c5 | 2488 | if (IS_ERR(segs)) |
f6a78bfc HX |
2489 | return PTR_ERR(segs); |
2490 | ||
2491 | skb->next = segs; | |
2492 | DEV_GSO_CB(skb)->destructor = skb->destructor; | |
2493 | skb->destructor = dev_gso_skb_destructor; | |
2494 | ||
2495 | return 0; | |
2496 | } | |
2497 | ||
c8f44aff | 2498 | static netdev_features_t harmonize_features(struct sk_buff *skb, |
cdbaa0bb | 2499 | netdev_features_t features) |
f01a5236 | 2500 | { |
c0d680e5 | 2501 | if (skb->ip_summed != CHECKSUM_NONE && |
cdbaa0bb | 2502 | !can_checksum_protocol(features, skb_network_protocol(skb))) { |
f01a5236 | 2503 | features &= ~NETIF_F_ALL_CSUM; |
f01a5236 JG |
2504 | } else if (illegal_highdma(skb->dev, skb)) { |
2505 | features &= ~NETIF_F_SG; | |
2506 | } | |
2507 | ||
2508 | return features; | |
2509 | } | |
2510 | ||
c8f44aff | 2511 | netdev_features_t netif_skb_features(struct sk_buff *skb) |
58e998c6 JG |
2512 | { |
2513 | __be16 protocol = skb->protocol; | |
c8f44aff | 2514 | netdev_features_t features = skb->dev->features; |
58e998c6 | 2515 | |
30b678d8 BH |
2516 | if (skb_shinfo(skb)->gso_segs > skb->dev->gso_max_segs) |
2517 | features &= ~NETIF_F_GSO_MASK; | |
2518 | ||
8ad227ff | 2519 | if (protocol == htons(ETH_P_8021Q) || protocol == htons(ETH_P_8021AD)) { |
58e998c6 JG |
2520 | struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data; |
2521 | protocol = veh->h_vlan_encapsulated_proto; | |
f01a5236 | 2522 | } else if (!vlan_tx_tag_present(skb)) { |
cdbaa0bb | 2523 | return harmonize_features(skb, features); |
f01a5236 | 2524 | } |
58e998c6 | 2525 | |
8ad227ff PM |
2526 | features &= (skb->dev->vlan_features | NETIF_F_HW_VLAN_CTAG_TX | |
2527 | NETIF_F_HW_VLAN_STAG_TX); | |
f01a5236 | 2528 | |
cdbaa0bb | 2529 | if (protocol == htons(ETH_P_8021Q) || protocol == htons(ETH_P_8021AD)) |
f01a5236 | 2530 | features &= NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | |
8ad227ff PM |
2531 | NETIF_F_GEN_CSUM | NETIF_F_HW_VLAN_CTAG_TX | |
2532 | NETIF_F_HW_VLAN_STAG_TX; | |
cdbaa0bb AD |
2533 | |
2534 | return harmonize_features(skb, features); | |
58e998c6 | 2535 | } |
f01a5236 | 2536 | EXPORT_SYMBOL(netif_skb_features); |
58e998c6 | 2537 | |
fd2ea0a7 | 2538 | int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev, |
a6cc0cfa | 2539 | struct netdev_queue *txq, void *accel_priv) |
f6a78bfc | 2540 | { |
00829823 | 2541 | const struct net_device_ops *ops = dev->netdev_ops; |
572a9d7b | 2542 | int rc = NETDEV_TX_OK; |
ec764bf0 | 2543 | unsigned int skb_len; |
00829823 | 2544 | |
f6a78bfc | 2545 | if (likely(!skb->next)) { |
c8f44aff | 2546 | netdev_features_t features; |
fc741216 | 2547 | |
93f154b5 | 2548 | /* |
25985edc | 2549 | * If device doesn't need skb->dst, release it right now while |
93f154b5 ED |
2550 | * its hot in this cpu cache |
2551 | */ | |
adf30907 ED |
2552 | if (dev->priv_flags & IFF_XMIT_DST_RELEASE) |
2553 | skb_dst_drop(skb); | |
2554 | ||
fc741216 JG |
2555 | features = netif_skb_features(skb); |
2556 | ||
7b9c6090 | 2557 | if (vlan_tx_tag_present(skb) && |
86a9bad3 PM |
2558 | !vlan_hw_offload_capable(features, skb->vlan_proto)) { |
2559 | skb = __vlan_put_tag(skb, skb->vlan_proto, | |
2560 | vlan_tx_tag_get(skb)); | |
7b9c6090 JG |
2561 | if (unlikely(!skb)) |
2562 | goto out; | |
2563 | ||
2564 | skb->vlan_tci = 0; | |
2565 | } | |
2566 | ||
fc70fb64 AD |
2567 | /* If encapsulation offload request, verify we are testing |
2568 | * hardware encapsulation features instead of standard | |
2569 | * features for the netdev | |
2570 | */ | |
2571 | if (skb->encapsulation) | |
2572 | features &= dev->hw_enc_features; | |
2573 | ||
fc741216 | 2574 | if (netif_needs_gso(skb, features)) { |
91ecb63c | 2575 | if (unlikely(dev_gso_segment(skb, features))) |
9ccb8975 DM |
2576 | goto out_kfree_skb; |
2577 | if (skb->next) | |
2578 | goto gso; | |
6afff0ca | 2579 | } else { |
02932ce9 | 2580 | if (skb_needs_linearize(skb, features) && |
6afff0ca JF |
2581 | __skb_linearize(skb)) |
2582 | goto out_kfree_skb; | |
2583 | ||
2584 | /* If packet is not checksummed and device does not | |
2585 | * support checksumming for this protocol, complete | |
2586 | * checksumming here. | |
2587 | */ | |
2588 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
fc70fb64 AD |
2589 | if (skb->encapsulation) |
2590 | skb_set_inner_transport_header(skb, | |
2591 | skb_checksum_start_offset(skb)); | |
2592 | else | |
2593 | skb_set_transport_header(skb, | |
2594 | skb_checksum_start_offset(skb)); | |
03634668 | 2595 | if (!(features & NETIF_F_ALL_CSUM) && |
6afff0ca JF |
2596 | skb_checksum_help(skb)) |
2597 | goto out_kfree_skb; | |
2598 | } | |
9ccb8975 DM |
2599 | } |
2600 | ||
b40863c6 ED |
2601 | if (!list_empty(&ptype_all)) |
2602 | dev_queue_xmit_nit(skb, dev); | |
2603 | ||
ec764bf0 | 2604 | skb_len = skb->len; |
a6cc0cfa JF |
2605 | if (accel_priv) |
2606 | rc = ops->ndo_dfwd_start_xmit(skb, dev, accel_priv); | |
2607 | else | |
2608 | rc = ops->ndo_start_xmit(skb, dev); | |
2609 | ||
ec764bf0 | 2610 | trace_net_dev_xmit(skb, rc, dev, skb_len); |
a6cc0cfa | 2611 | if (rc == NETDEV_TX_OK && txq) |
08baf561 | 2612 | txq_trans_update(txq); |
ac45f602 | 2613 | return rc; |
f6a78bfc HX |
2614 | } |
2615 | ||
576a30eb | 2616 | gso: |
f6a78bfc HX |
2617 | do { |
2618 | struct sk_buff *nskb = skb->next; | |
f6a78bfc HX |
2619 | |
2620 | skb->next = nskb->next; | |
2621 | nskb->next = NULL; | |
068a2de5 | 2622 | |
b40863c6 ED |
2623 | if (!list_empty(&ptype_all)) |
2624 | dev_queue_xmit_nit(nskb, dev); | |
2625 | ||
ec764bf0 | 2626 | skb_len = nskb->len; |
a6cc0cfa JF |
2627 | if (accel_priv) |
2628 | rc = ops->ndo_dfwd_start_xmit(nskb, dev, accel_priv); | |
2629 | else | |
2630 | rc = ops->ndo_start_xmit(nskb, dev); | |
ec764bf0 | 2631 | trace_net_dev_xmit(nskb, rc, dev, skb_len); |
ec634fe3 | 2632 | if (unlikely(rc != NETDEV_TX_OK)) { |
572a9d7b PM |
2633 | if (rc & ~NETDEV_TX_MASK) |
2634 | goto out_kfree_gso_skb; | |
f54d9e8d | 2635 | nskb->next = skb->next; |
f6a78bfc HX |
2636 | skb->next = nskb; |
2637 | return rc; | |
2638 | } | |
08baf561 | 2639 | txq_trans_update(txq); |
73466498 | 2640 | if (unlikely(netif_xmit_stopped(txq) && skb->next)) |
f54d9e8d | 2641 | return NETDEV_TX_BUSY; |
f6a78bfc | 2642 | } while (skb->next); |
4ec93edb | 2643 | |
572a9d7b | 2644 | out_kfree_gso_skb: |
0c772159 | 2645 | if (likely(skb->next == NULL)) { |
572a9d7b | 2646 | skb->destructor = DEV_GSO_CB(skb)->destructor; |
0c772159 SS |
2647 | consume_skb(skb); |
2648 | return rc; | |
2649 | } | |
f6a78bfc HX |
2650 | out_kfree_skb: |
2651 | kfree_skb(skb); | |
7b9c6090 | 2652 | out: |
572a9d7b | 2653 | return rc; |
f6a78bfc | 2654 | } |
a6cc0cfa | 2655 | EXPORT_SYMBOL_GPL(dev_hard_start_xmit); |
f6a78bfc | 2656 | |
1def9238 ED |
2657 | static void qdisc_pkt_len_init(struct sk_buff *skb) |
2658 | { | |
2659 | const struct skb_shared_info *shinfo = skb_shinfo(skb); | |
2660 | ||
2661 | qdisc_skb_cb(skb)->pkt_len = skb->len; | |
2662 | ||
2663 | /* To get more precise estimation of bytes sent on wire, | |
2664 | * we add to pkt_len the headers size of all segments | |
2665 | */ | |
2666 | if (shinfo->gso_size) { | |
757b8b1d | 2667 | unsigned int hdr_len; |
15e5a030 | 2668 | u16 gso_segs = shinfo->gso_segs; |
1def9238 | 2669 | |
757b8b1d ED |
2670 | /* mac layer + network layer */ |
2671 | hdr_len = skb_transport_header(skb) - skb_mac_header(skb); | |
2672 | ||
2673 | /* + transport layer */ | |
1def9238 ED |
2674 | if (likely(shinfo->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6))) |
2675 | hdr_len += tcp_hdrlen(skb); | |
2676 | else | |
2677 | hdr_len += sizeof(struct udphdr); | |
15e5a030 JW |
2678 | |
2679 | if (shinfo->gso_type & SKB_GSO_DODGY) | |
2680 | gso_segs = DIV_ROUND_UP(skb->len - hdr_len, | |
2681 | shinfo->gso_size); | |
2682 | ||
2683 | qdisc_skb_cb(skb)->pkt_len += (gso_segs - 1) * hdr_len; | |
1def9238 ED |
2684 | } |
2685 | } | |
2686 | ||
bbd8a0d3 KK |
2687 | static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q, |
2688 | struct net_device *dev, | |
2689 | struct netdev_queue *txq) | |
2690 | { | |
2691 | spinlock_t *root_lock = qdisc_lock(q); | |
a2da570d | 2692 | bool contended; |
bbd8a0d3 KK |
2693 | int rc; |
2694 | ||
1def9238 | 2695 | qdisc_pkt_len_init(skb); |
a2da570d | 2696 | qdisc_calculate_pkt_len(skb, q); |
79640a4c ED |
2697 | /* |
2698 | * Heuristic to force contended enqueues to serialize on a | |
2699 | * separate lock before trying to get qdisc main lock. | |
2700 | * This permits __QDISC_STATE_RUNNING owner to get the lock more often | |
2701 | * and dequeue packets faster. | |
2702 | */ | |
a2da570d | 2703 | contended = qdisc_is_running(q); |
79640a4c ED |
2704 | if (unlikely(contended)) |
2705 | spin_lock(&q->busylock); | |
2706 | ||
bbd8a0d3 KK |
2707 | spin_lock(root_lock); |
2708 | if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) { | |
2709 | kfree_skb(skb); | |
2710 | rc = NET_XMIT_DROP; | |
2711 | } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) && | |
bc135b23 | 2712 | qdisc_run_begin(q)) { |
bbd8a0d3 KK |
2713 | /* |
2714 | * This is a work-conserving queue; there are no old skbs | |
2715 | * waiting to be sent out; and the qdisc is not running - | |
2716 | * xmit the skb directly. | |
2717 | */ | |
7fee226a ED |
2718 | if (!(dev->priv_flags & IFF_XMIT_DST_RELEASE)) |
2719 | skb_dst_force(skb); | |
bfe0d029 | 2720 | |
bfe0d029 ED |
2721 | qdisc_bstats_update(q, skb); |
2722 | ||
79640a4c ED |
2723 | if (sch_direct_xmit(skb, q, dev, txq, root_lock)) { |
2724 | if (unlikely(contended)) { | |
2725 | spin_unlock(&q->busylock); | |
2726 | contended = false; | |
2727 | } | |
bbd8a0d3 | 2728 | __qdisc_run(q); |
79640a4c | 2729 | } else |
bc135b23 | 2730 | qdisc_run_end(q); |
bbd8a0d3 KK |
2731 | |
2732 | rc = NET_XMIT_SUCCESS; | |
2733 | } else { | |
7fee226a | 2734 | skb_dst_force(skb); |
a2da570d | 2735 | rc = q->enqueue(skb, q) & NET_XMIT_MASK; |
79640a4c ED |
2736 | if (qdisc_run_begin(q)) { |
2737 | if (unlikely(contended)) { | |
2738 | spin_unlock(&q->busylock); | |
2739 | contended = false; | |
2740 | } | |
2741 | __qdisc_run(q); | |
2742 | } | |
bbd8a0d3 KK |
2743 | } |
2744 | spin_unlock(root_lock); | |
79640a4c ED |
2745 | if (unlikely(contended)) |
2746 | spin_unlock(&q->busylock); | |
bbd8a0d3 KK |
2747 | return rc; |
2748 | } | |
2749 | ||
5bc1421e NH |
2750 | #if IS_ENABLED(CONFIG_NETPRIO_CGROUP) |
2751 | static void skb_update_prio(struct sk_buff *skb) | |
2752 | { | |
6977a79d | 2753 | struct netprio_map *map = rcu_dereference_bh(skb->dev->priomap); |
5bc1421e | 2754 | |
91c68ce2 ED |
2755 | if (!skb->priority && skb->sk && map) { |
2756 | unsigned int prioidx = skb->sk->sk_cgrp_prioidx; | |
2757 | ||
2758 | if (prioidx < map->priomap_len) | |
2759 | skb->priority = map->priomap[prioidx]; | |
2760 | } | |
5bc1421e NH |
2761 | } |
2762 | #else | |
2763 | #define skb_update_prio(skb) | |
2764 | #endif | |
2765 | ||
745e20f1 | 2766 | static DEFINE_PER_CPU(int, xmit_recursion); |
11a766ce | 2767 | #define RECURSION_LIMIT 10 |
745e20f1 | 2768 | |
95603e22 MM |
2769 | /** |
2770 | * dev_loopback_xmit - loop back @skb | |
2771 | * @skb: buffer to transmit | |
2772 | */ | |
2773 | int dev_loopback_xmit(struct sk_buff *skb) | |
2774 | { | |
2775 | skb_reset_mac_header(skb); | |
2776 | __skb_pull(skb, skb_network_offset(skb)); | |
2777 | skb->pkt_type = PACKET_LOOPBACK; | |
2778 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
2779 | WARN_ON(!skb_dst(skb)); | |
2780 | skb_dst_force(skb); | |
2781 | netif_rx_ni(skb); | |
2782 | return 0; | |
2783 | } | |
2784 | EXPORT_SYMBOL(dev_loopback_xmit); | |
2785 | ||
d29f749e DJ |
2786 | /** |
2787 | * dev_queue_xmit - transmit a buffer | |
2788 | * @skb: buffer to transmit | |
2789 | * | |
2790 | * Queue a buffer for transmission to a network device. The caller must | |
2791 | * have set the device and priority and built the buffer before calling | |
2792 | * this function. The function can be called from an interrupt. | |
2793 | * | |
2794 | * A negative errno code is returned on a failure. A success does not | |
2795 | * guarantee the frame will be transmitted as it may be dropped due | |
2796 | * to congestion or traffic shaping. | |
2797 | * | |
2798 | * ----------------------------------------------------------------------------------- | |
2799 | * I notice this method can also return errors from the queue disciplines, | |
2800 | * including NET_XMIT_DROP, which is a positive value. So, errors can also | |
2801 | * be positive. | |
2802 | * | |
2803 | * Regardless of the return value, the skb is consumed, so it is currently | |
2804 | * difficult to retry a send to this method. (You can bump the ref count | |
2805 | * before sending to hold a reference for retry if you are careful.) | |
2806 | * | |
2807 | * When calling this method, interrupts MUST be enabled. This is because | |
2808 | * the BH enable code must have IRQs enabled so that it will not deadlock. | |
2809 | * --BLG | |
2810 | */ | |
1da177e4 LT |
2811 | int dev_queue_xmit(struct sk_buff *skb) |
2812 | { | |
2813 | struct net_device *dev = skb->dev; | |
dc2b4847 | 2814 | struct netdev_queue *txq; |
1da177e4 LT |
2815 | struct Qdisc *q; |
2816 | int rc = -ENOMEM; | |
2817 | ||
6d1ccff6 ED |
2818 | skb_reset_mac_header(skb); |
2819 | ||
4ec93edb YH |
2820 | /* Disable soft irqs for various locks below. Also |
2821 | * stops preemption for RCU. | |
1da177e4 | 2822 | */ |
4ec93edb | 2823 | rcu_read_lock_bh(); |
1da177e4 | 2824 | |
5bc1421e NH |
2825 | skb_update_prio(skb); |
2826 | ||
8c4c49df | 2827 | txq = netdev_pick_tx(dev, skb); |
a898def2 | 2828 | q = rcu_dereference_bh(txq->qdisc); |
37437bb2 | 2829 | |
1da177e4 | 2830 | #ifdef CONFIG_NET_CLS_ACT |
d1b19dff | 2831 | skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS); |
1da177e4 | 2832 | #endif |
cf66ba58 | 2833 | trace_net_dev_queue(skb); |
1da177e4 | 2834 | if (q->enqueue) { |
bbd8a0d3 | 2835 | rc = __dev_xmit_skb(skb, q, dev, txq); |
37437bb2 | 2836 | goto out; |
1da177e4 LT |
2837 | } |
2838 | ||
2839 | /* The device has no queue. Common case for software devices: | |
2840 | loopback, all the sorts of tunnels... | |
2841 | ||
932ff279 HX |
2842 | Really, it is unlikely that netif_tx_lock protection is necessary |
2843 | here. (f.e. loopback and IP tunnels are clean ignoring statistics | |
1da177e4 LT |
2844 | counters.) |
2845 | However, it is possible, that they rely on protection | |
2846 | made by us here. | |
2847 | ||
2848 | Check this and shot the lock. It is not prone from deadlocks. | |
2849 | Either shot noqueue qdisc, it is even simpler 8) | |
2850 | */ | |
2851 | if (dev->flags & IFF_UP) { | |
2852 | int cpu = smp_processor_id(); /* ok because BHs are off */ | |
2853 | ||
c773e847 | 2854 | if (txq->xmit_lock_owner != cpu) { |
1da177e4 | 2855 | |
745e20f1 ED |
2856 | if (__this_cpu_read(xmit_recursion) > RECURSION_LIMIT) |
2857 | goto recursion_alert; | |
2858 | ||
c773e847 | 2859 | HARD_TX_LOCK(dev, txq, cpu); |
1da177e4 | 2860 | |
73466498 | 2861 | if (!netif_xmit_stopped(txq)) { |
745e20f1 | 2862 | __this_cpu_inc(xmit_recursion); |
a6cc0cfa | 2863 | rc = dev_hard_start_xmit(skb, dev, txq, NULL); |
745e20f1 | 2864 | __this_cpu_dec(xmit_recursion); |
572a9d7b | 2865 | if (dev_xmit_complete(rc)) { |
c773e847 | 2866 | HARD_TX_UNLOCK(dev, txq); |
1da177e4 LT |
2867 | goto out; |
2868 | } | |
2869 | } | |
c773e847 | 2870 | HARD_TX_UNLOCK(dev, txq); |
e87cc472 JP |
2871 | net_crit_ratelimited("Virtual device %s asks to queue packet!\n", |
2872 | dev->name); | |
1da177e4 LT |
2873 | } else { |
2874 | /* Recursion is detected! It is possible, | |
745e20f1 ED |
2875 | * unfortunately |
2876 | */ | |
2877 | recursion_alert: | |
e87cc472 JP |
2878 | net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n", |
2879 | dev->name); | |
1da177e4 LT |
2880 | } |
2881 | } | |
2882 | ||
2883 | rc = -ENETDOWN; | |
d4828d85 | 2884 | rcu_read_unlock_bh(); |
1da177e4 | 2885 | |
1da177e4 LT |
2886 | kfree_skb(skb); |
2887 | return rc; | |
2888 | out: | |
d4828d85 | 2889 | rcu_read_unlock_bh(); |
1da177e4 LT |
2890 | return rc; |
2891 | } | |
d1b19dff | 2892 | EXPORT_SYMBOL(dev_queue_xmit); |
1da177e4 LT |
2893 | |
2894 | ||
2895 | /*======================================================================= | |
2896 | Receiver routines | |
2897 | =======================================================================*/ | |
2898 | ||
6b2bedc3 | 2899 | int netdev_max_backlog __read_mostly = 1000; |
c9e6bc64 ED |
2900 | EXPORT_SYMBOL(netdev_max_backlog); |
2901 | ||
3b098e2d | 2902 | int netdev_tstamp_prequeue __read_mostly = 1; |
6b2bedc3 SH |
2903 | int netdev_budget __read_mostly = 300; |
2904 | int weight_p __read_mostly = 64; /* old backlog weight */ | |
1da177e4 | 2905 | |
eecfd7c4 ED |
2906 | /* Called with irq disabled */ |
2907 | static inline void ____napi_schedule(struct softnet_data *sd, | |
2908 | struct napi_struct *napi) | |
2909 | { | |
2910 | list_add_tail(&napi->poll_list, &sd->poll_list); | |
2911 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); | |
2912 | } | |
2913 | ||
bfb564e7 KK |
2914 | #ifdef CONFIG_RPS |
2915 | ||
2916 | /* One global table that all flow-based protocols share. */ | |
6e3f7faf | 2917 | struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly; |
bfb564e7 KK |
2918 | EXPORT_SYMBOL(rps_sock_flow_table); |
2919 | ||
c5905afb | 2920 | struct static_key rps_needed __read_mostly; |
adc9300e | 2921 | |
c445477d BH |
2922 | static struct rps_dev_flow * |
2923 | set_rps_cpu(struct net_device *dev, struct sk_buff *skb, | |
2924 | struct rps_dev_flow *rflow, u16 next_cpu) | |
2925 | { | |
09994d1b | 2926 | if (next_cpu != RPS_NO_CPU) { |
c445477d BH |
2927 | #ifdef CONFIG_RFS_ACCEL |
2928 | struct netdev_rx_queue *rxqueue; | |
2929 | struct rps_dev_flow_table *flow_table; | |
2930 | struct rps_dev_flow *old_rflow; | |
2931 | u32 flow_id; | |
2932 | u16 rxq_index; | |
2933 | int rc; | |
2934 | ||
2935 | /* Should we steer this flow to a different hardware queue? */ | |
69a19ee6 BH |
2936 | if (!skb_rx_queue_recorded(skb) || !dev->rx_cpu_rmap || |
2937 | !(dev->features & NETIF_F_NTUPLE)) | |
c445477d BH |
2938 | goto out; |
2939 | rxq_index = cpu_rmap_lookup_index(dev->rx_cpu_rmap, next_cpu); | |
2940 | if (rxq_index == skb_get_rx_queue(skb)) | |
2941 | goto out; | |
2942 | ||
2943 | rxqueue = dev->_rx + rxq_index; | |
2944 | flow_table = rcu_dereference(rxqueue->rps_flow_table); | |
2945 | if (!flow_table) | |
2946 | goto out; | |
2947 | flow_id = skb->rxhash & flow_table->mask; | |
2948 | rc = dev->netdev_ops->ndo_rx_flow_steer(dev, skb, | |
2949 | rxq_index, flow_id); | |
2950 | if (rc < 0) | |
2951 | goto out; | |
2952 | old_rflow = rflow; | |
2953 | rflow = &flow_table->flows[flow_id]; | |
c445477d BH |
2954 | rflow->filter = rc; |
2955 | if (old_rflow->filter == rflow->filter) | |
2956 | old_rflow->filter = RPS_NO_FILTER; | |
2957 | out: | |
2958 | #endif | |
2959 | rflow->last_qtail = | |
09994d1b | 2960 | per_cpu(softnet_data, next_cpu).input_queue_head; |
c445477d BH |
2961 | } |
2962 | ||
09994d1b | 2963 | rflow->cpu = next_cpu; |
c445477d BH |
2964 | return rflow; |
2965 | } | |
2966 | ||
bfb564e7 KK |
2967 | /* |
2968 | * get_rps_cpu is called from netif_receive_skb and returns the target | |
2969 | * CPU from the RPS map of the receiving queue for a given skb. | |
2970 | * rcu_read_lock must be held on entry. | |
2971 | */ | |
2972 | static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb, | |
2973 | struct rps_dev_flow **rflowp) | |
2974 | { | |
2975 | struct netdev_rx_queue *rxqueue; | |
6e3f7faf | 2976 | struct rps_map *map; |
bfb564e7 KK |
2977 | struct rps_dev_flow_table *flow_table; |
2978 | struct rps_sock_flow_table *sock_flow_table; | |
2979 | int cpu = -1; | |
2980 | u16 tcpu; | |
2981 | ||
2982 | if (skb_rx_queue_recorded(skb)) { | |
2983 | u16 index = skb_get_rx_queue(skb); | |
62fe0b40 BH |
2984 | if (unlikely(index >= dev->real_num_rx_queues)) { |
2985 | WARN_ONCE(dev->real_num_rx_queues > 1, | |
2986 | "%s received packet on queue %u, but number " | |
2987 | "of RX queues is %u\n", | |
2988 | dev->name, index, dev->real_num_rx_queues); | |
bfb564e7 KK |
2989 | goto done; |
2990 | } | |
2991 | rxqueue = dev->_rx + index; | |
2992 | } else | |
2993 | rxqueue = dev->_rx; | |
2994 | ||
6e3f7faf ED |
2995 | map = rcu_dereference(rxqueue->rps_map); |
2996 | if (map) { | |
85875236 | 2997 | if (map->len == 1 && |
33d480ce | 2998 | !rcu_access_pointer(rxqueue->rps_flow_table)) { |
6febfca9 CG |
2999 | tcpu = map->cpus[0]; |
3000 | if (cpu_online(tcpu)) | |
3001 | cpu = tcpu; | |
3002 | goto done; | |
3003 | } | |
33d480ce | 3004 | } else if (!rcu_access_pointer(rxqueue->rps_flow_table)) { |
bfb564e7 | 3005 | goto done; |
6febfca9 | 3006 | } |
bfb564e7 | 3007 | |
2d47b459 | 3008 | skb_reset_network_header(skb); |
bfb564e7 KK |
3009 | if (!skb_get_rxhash(skb)) |
3010 | goto done; | |
3011 | ||
fec5e652 TH |
3012 | flow_table = rcu_dereference(rxqueue->rps_flow_table); |
3013 | sock_flow_table = rcu_dereference(rps_sock_flow_table); | |
3014 | if (flow_table && sock_flow_table) { | |
3015 | u16 next_cpu; | |
3016 | struct rps_dev_flow *rflow; | |
3017 | ||
3018 | rflow = &flow_table->flows[skb->rxhash & flow_table->mask]; | |
3019 | tcpu = rflow->cpu; | |
3020 | ||
3021 | next_cpu = sock_flow_table->ents[skb->rxhash & | |
3022 | sock_flow_table->mask]; | |
3023 | ||
3024 | /* | |
3025 | * If the desired CPU (where last recvmsg was done) is | |
3026 | * different from current CPU (one in the rx-queue flow | |
3027 | * table entry), switch if one of the following holds: | |
3028 | * - Current CPU is unset (equal to RPS_NO_CPU). | |
3029 | * - Current CPU is offline. | |
3030 | * - The current CPU's queue tail has advanced beyond the | |
3031 | * last packet that was enqueued using this table entry. | |
3032 | * This guarantees that all previous packets for the flow | |
3033 | * have been dequeued, thus preserving in order delivery. | |
3034 | */ | |
3035 | if (unlikely(tcpu != next_cpu) && | |
3036 | (tcpu == RPS_NO_CPU || !cpu_online(tcpu) || | |
3037 | ((int)(per_cpu(softnet_data, tcpu).input_queue_head - | |
baefa31d TH |
3038 | rflow->last_qtail)) >= 0)) { |
3039 | tcpu = next_cpu; | |
c445477d | 3040 | rflow = set_rps_cpu(dev, skb, rflow, next_cpu); |
baefa31d | 3041 | } |
c445477d | 3042 | |
fec5e652 TH |
3043 | if (tcpu != RPS_NO_CPU && cpu_online(tcpu)) { |
3044 | *rflowp = rflow; | |
3045 | cpu = tcpu; | |
3046 | goto done; | |
3047 | } | |
3048 | } | |
3049 | ||
0a9627f2 | 3050 | if (map) { |
fec5e652 | 3051 | tcpu = map->cpus[((u64) skb->rxhash * map->len) >> 32]; |
0a9627f2 TH |
3052 | |
3053 | if (cpu_online(tcpu)) { | |
3054 | cpu = tcpu; | |
3055 | goto done; | |
3056 | } | |
3057 | } | |
3058 | ||
3059 | done: | |
0a9627f2 TH |
3060 | return cpu; |
3061 | } | |
3062 | ||
c445477d BH |
3063 | #ifdef CONFIG_RFS_ACCEL |
3064 | ||
3065 | /** | |
3066 | * rps_may_expire_flow - check whether an RFS hardware filter may be removed | |
3067 | * @dev: Device on which the filter was set | |
3068 | * @rxq_index: RX queue index | |
3069 | * @flow_id: Flow ID passed to ndo_rx_flow_steer() | |
3070 | * @filter_id: Filter ID returned by ndo_rx_flow_steer() | |
3071 | * | |
3072 | * Drivers that implement ndo_rx_flow_steer() should periodically call | |
3073 | * this function for each installed filter and remove the filters for | |
3074 | * which it returns %true. | |
3075 | */ | |
3076 | bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index, | |
3077 | u32 flow_id, u16 filter_id) | |
3078 | { | |
3079 | struct netdev_rx_queue *rxqueue = dev->_rx + rxq_index; | |
3080 | struct rps_dev_flow_table *flow_table; | |
3081 | struct rps_dev_flow *rflow; | |
3082 | bool expire = true; | |
3083 | int cpu; | |
3084 | ||
3085 | rcu_read_lock(); | |
3086 | flow_table = rcu_dereference(rxqueue->rps_flow_table); | |
3087 | if (flow_table && flow_id <= flow_table->mask) { | |
3088 | rflow = &flow_table->flows[flow_id]; | |
3089 | cpu = ACCESS_ONCE(rflow->cpu); | |
3090 | if (rflow->filter == filter_id && cpu != RPS_NO_CPU && | |
3091 | ((int)(per_cpu(softnet_data, cpu).input_queue_head - | |
3092 | rflow->last_qtail) < | |
3093 | (int)(10 * flow_table->mask))) | |
3094 | expire = false; | |
3095 | } | |
3096 | rcu_read_unlock(); | |
3097 | return expire; | |
3098 | } | |
3099 | EXPORT_SYMBOL(rps_may_expire_flow); | |
3100 | ||
3101 | #endif /* CONFIG_RFS_ACCEL */ | |
3102 | ||
0a9627f2 | 3103 | /* Called from hardirq (IPI) context */ |
e36fa2f7 | 3104 | static void rps_trigger_softirq(void *data) |
0a9627f2 | 3105 | { |
e36fa2f7 ED |
3106 | struct softnet_data *sd = data; |
3107 | ||
eecfd7c4 | 3108 | ____napi_schedule(sd, &sd->backlog); |
dee42870 | 3109 | sd->received_rps++; |
0a9627f2 | 3110 | } |
e36fa2f7 | 3111 | |
fec5e652 | 3112 | #endif /* CONFIG_RPS */ |
0a9627f2 | 3113 | |
e36fa2f7 ED |
3114 | /* |
3115 | * Check if this softnet_data structure is another cpu one | |
3116 | * If yes, queue it to our IPI list and return 1 | |
3117 | * If no, return 0 | |
3118 | */ | |
3119 | static int rps_ipi_queued(struct softnet_data *sd) | |
3120 | { | |
3121 | #ifdef CONFIG_RPS | |
3122 | struct softnet_data *mysd = &__get_cpu_var(softnet_data); | |
3123 | ||
3124 | if (sd != mysd) { | |
3125 | sd->rps_ipi_next = mysd->rps_ipi_list; | |
3126 | mysd->rps_ipi_list = sd; | |
3127 | ||
3128 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); | |
3129 | return 1; | |
3130 | } | |
3131 | #endif /* CONFIG_RPS */ | |
3132 | return 0; | |
3133 | } | |
3134 | ||
99bbc707 WB |
3135 | #ifdef CONFIG_NET_FLOW_LIMIT |
3136 | int netdev_flow_limit_table_len __read_mostly = (1 << 12); | |
3137 | #endif | |
3138 | ||
3139 | static bool skb_flow_limit(struct sk_buff *skb, unsigned int qlen) | |
3140 | { | |
3141 | #ifdef CONFIG_NET_FLOW_LIMIT | |
3142 | struct sd_flow_limit *fl; | |
3143 | struct softnet_data *sd; | |
3144 | unsigned int old_flow, new_flow; | |
3145 | ||
3146 | if (qlen < (netdev_max_backlog >> 1)) | |
3147 | return false; | |
3148 | ||
3149 | sd = &__get_cpu_var(softnet_data); | |
3150 | ||
3151 | rcu_read_lock(); | |
3152 | fl = rcu_dereference(sd->flow_limit); | |
3153 | if (fl) { | |
3154 | new_flow = skb_get_rxhash(skb) & (fl->num_buckets - 1); | |
3155 | old_flow = fl->history[fl->history_head]; | |
3156 | fl->history[fl->history_head] = new_flow; | |
3157 | ||
3158 | fl->history_head++; | |
3159 | fl->history_head &= FLOW_LIMIT_HISTORY - 1; | |
3160 | ||
3161 | if (likely(fl->buckets[old_flow])) | |
3162 | fl->buckets[old_flow]--; | |
3163 | ||
3164 | if (++fl->buckets[new_flow] > (FLOW_LIMIT_HISTORY >> 1)) { | |
3165 | fl->count++; | |
3166 | rcu_read_unlock(); | |
3167 | return true; | |
3168 | } | |
3169 | } | |
3170 | rcu_read_unlock(); | |
3171 | #endif | |
3172 | return false; | |
3173 | } | |
3174 | ||
0a9627f2 TH |
3175 | /* |
3176 | * enqueue_to_backlog is called to queue an skb to a per CPU backlog | |
3177 | * queue (may be a remote CPU queue). | |
3178 | */ | |
fec5e652 TH |
3179 | static int enqueue_to_backlog(struct sk_buff *skb, int cpu, |
3180 | unsigned int *qtail) | |
0a9627f2 | 3181 | { |
e36fa2f7 | 3182 | struct softnet_data *sd; |
0a9627f2 | 3183 | unsigned long flags; |
99bbc707 | 3184 | unsigned int qlen; |
0a9627f2 | 3185 | |
e36fa2f7 | 3186 | sd = &per_cpu(softnet_data, cpu); |
0a9627f2 TH |
3187 | |
3188 | local_irq_save(flags); | |
0a9627f2 | 3189 | |
e36fa2f7 | 3190 | rps_lock(sd); |
99bbc707 WB |
3191 | qlen = skb_queue_len(&sd->input_pkt_queue); |
3192 | if (qlen <= netdev_max_backlog && !skb_flow_limit(skb, qlen)) { | |
6e7676c1 | 3193 | if (skb_queue_len(&sd->input_pkt_queue)) { |
0a9627f2 | 3194 | enqueue: |
e36fa2f7 | 3195 | __skb_queue_tail(&sd->input_pkt_queue, skb); |
76cc8b13 | 3196 | input_queue_tail_incr_save(sd, qtail); |
e36fa2f7 | 3197 | rps_unlock(sd); |
152102c7 | 3198 | local_irq_restore(flags); |
0a9627f2 TH |
3199 | return NET_RX_SUCCESS; |
3200 | } | |
3201 | ||
ebda37c2 ED |
3202 | /* Schedule NAPI for backlog device |
3203 | * We can use non atomic operation since we own the queue lock | |
3204 | */ | |
3205 | if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) { | |
e36fa2f7 | 3206 | if (!rps_ipi_queued(sd)) |
eecfd7c4 | 3207 | ____napi_schedule(sd, &sd->backlog); |
0a9627f2 TH |
3208 | } |
3209 | goto enqueue; | |
3210 | } | |
3211 | ||
dee42870 | 3212 | sd->dropped++; |
e36fa2f7 | 3213 | rps_unlock(sd); |
0a9627f2 | 3214 | |
0a9627f2 TH |
3215 | local_irq_restore(flags); |
3216 | ||
caf586e5 | 3217 | atomic_long_inc(&skb->dev->rx_dropped); |
0a9627f2 TH |
3218 | kfree_skb(skb); |
3219 | return NET_RX_DROP; | |
3220 | } | |
1da177e4 | 3221 | |
1da177e4 LT |
3222 | /** |
3223 | * netif_rx - post buffer to the network code | |
3224 | * @skb: buffer to post | |
3225 | * | |
3226 | * This function receives a packet from a device driver and queues it for | |
3227 | * the upper (protocol) levels to process. It always succeeds. The buffer | |
3228 | * may be dropped during processing for congestion control or by the | |
3229 | * protocol layers. | |
3230 | * | |
3231 | * return values: | |
3232 | * NET_RX_SUCCESS (no congestion) | |
1da177e4 LT |
3233 | * NET_RX_DROP (packet was dropped) |
3234 | * | |
3235 | */ | |
3236 | ||
3237 | int netif_rx(struct sk_buff *skb) | |
3238 | { | |
b0e28f1e | 3239 | int ret; |
1da177e4 LT |
3240 | |
3241 | /* if netpoll wants it, pretend we never saw it */ | |
3242 | if (netpoll_rx(skb)) | |
3243 | return NET_RX_DROP; | |
3244 | ||
588f0330 | 3245 | net_timestamp_check(netdev_tstamp_prequeue, skb); |
1da177e4 | 3246 | |
cf66ba58 | 3247 | trace_netif_rx(skb); |
df334545 | 3248 | #ifdef CONFIG_RPS |
c5905afb | 3249 | if (static_key_false(&rps_needed)) { |
fec5e652 | 3250 | struct rps_dev_flow voidflow, *rflow = &voidflow; |
b0e28f1e ED |
3251 | int cpu; |
3252 | ||
cece1945 | 3253 | preempt_disable(); |
b0e28f1e | 3254 | rcu_read_lock(); |
fec5e652 TH |
3255 | |
3256 | cpu = get_rps_cpu(skb->dev, skb, &rflow); | |
b0e28f1e ED |
3257 | if (cpu < 0) |
3258 | cpu = smp_processor_id(); | |
fec5e652 TH |
3259 | |
3260 | ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail); | |
3261 | ||
b0e28f1e | 3262 | rcu_read_unlock(); |
cece1945 | 3263 | preempt_enable(); |
adc9300e ED |
3264 | } else |
3265 | #endif | |
fec5e652 TH |
3266 | { |
3267 | unsigned int qtail; | |
3268 | ret = enqueue_to_backlog(skb, get_cpu(), &qtail); | |
3269 | put_cpu(); | |
3270 | } | |
b0e28f1e | 3271 | return ret; |
1da177e4 | 3272 | } |
d1b19dff | 3273 | EXPORT_SYMBOL(netif_rx); |
1da177e4 LT |
3274 | |
3275 | int netif_rx_ni(struct sk_buff *skb) | |
3276 | { | |
3277 | int err; | |
3278 | ||
3279 | preempt_disable(); | |
3280 | err = netif_rx(skb); | |
3281 | if (local_softirq_pending()) | |
3282 | do_softirq(); | |
3283 | preempt_enable(); | |
3284 | ||
3285 | return err; | |
3286 | } | |
1da177e4 LT |
3287 | EXPORT_SYMBOL(netif_rx_ni); |
3288 | ||
1da177e4 LT |
3289 | static void net_tx_action(struct softirq_action *h) |
3290 | { | |
3291 | struct softnet_data *sd = &__get_cpu_var(softnet_data); | |
3292 | ||
3293 | if (sd->completion_queue) { | |
3294 | struct sk_buff *clist; | |
3295 | ||
3296 | local_irq_disable(); | |
3297 | clist = sd->completion_queue; | |
3298 | sd->completion_queue = NULL; | |
3299 | local_irq_enable(); | |
3300 | ||
3301 | while (clist) { | |
3302 | struct sk_buff *skb = clist; | |
3303 | clist = clist->next; | |
3304 | ||
547b792c | 3305 | WARN_ON(atomic_read(&skb->users)); |
e6247027 ED |
3306 | if (likely(get_kfree_skb_cb(skb)->reason == SKB_REASON_CONSUMED)) |
3307 | trace_consume_skb(skb); | |
3308 | else | |
3309 | trace_kfree_skb(skb, net_tx_action); | |
1da177e4 LT |
3310 | __kfree_skb(skb); |
3311 | } | |
3312 | } | |
3313 | ||
3314 | if (sd->output_queue) { | |
37437bb2 | 3315 | struct Qdisc *head; |
1da177e4 LT |
3316 | |
3317 | local_irq_disable(); | |
3318 | head = sd->output_queue; | |
3319 | sd->output_queue = NULL; | |
a9cbd588 | 3320 | sd->output_queue_tailp = &sd->output_queue; |
1da177e4 LT |
3321 | local_irq_enable(); |
3322 | ||
3323 | while (head) { | |
37437bb2 DM |
3324 | struct Qdisc *q = head; |
3325 | spinlock_t *root_lock; | |
3326 | ||
1da177e4 LT |
3327 | head = head->next_sched; |
3328 | ||
5fb66229 | 3329 | root_lock = qdisc_lock(q); |
37437bb2 | 3330 | if (spin_trylock(root_lock)) { |
def82a1d JP |
3331 | smp_mb__before_clear_bit(); |
3332 | clear_bit(__QDISC_STATE_SCHED, | |
3333 | &q->state); | |
37437bb2 DM |
3334 | qdisc_run(q); |
3335 | spin_unlock(root_lock); | |
1da177e4 | 3336 | } else { |
195648bb | 3337 | if (!test_bit(__QDISC_STATE_DEACTIVATED, |
e8a83e10 | 3338 | &q->state)) { |
195648bb | 3339 | __netif_reschedule(q); |
e8a83e10 JP |
3340 | } else { |
3341 | smp_mb__before_clear_bit(); | |
3342 | clear_bit(__QDISC_STATE_SCHED, | |
3343 | &q->state); | |
3344 | } | |
1da177e4 LT |
3345 | } |
3346 | } | |
3347 | } | |
3348 | } | |
3349 | ||
ab95bfe0 JP |
3350 | #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \ |
3351 | (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)) | |
da678292 MM |
3352 | /* This hook is defined here for ATM LANE */ |
3353 | int (*br_fdb_test_addr_hook)(struct net_device *dev, | |
3354 | unsigned char *addr) __read_mostly; | |
4fb019a0 | 3355 | EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook); |
da678292 | 3356 | #endif |
1da177e4 | 3357 | |
1da177e4 LT |
3358 | #ifdef CONFIG_NET_CLS_ACT |
3359 | /* TODO: Maybe we should just force sch_ingress to be compiled in | |
3360 | * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions | |
3361 | * a compare and 2 stores extra right now if we dont have it on | |
3362 | * but have CONFIG_NET_CLS_ACT | |
25985edc LDM |
3363 | * NOTE: This doesn't stop any functionality; if you dont have |
3364 | * the ingress scheduler, you just can't add policies on ingress. | |
1da177e4 LT |
3365 | * |
3366 | */ | |
24824a09 | 3367 | static int ing_filter(struct sk_buff *skb, struct netdev_queue *rxq) |
1da177e4 | 3368 | { |
1da177e4 | 3369 | struct net_device *dev = skb->dev; |
f697c3e8 | 3370 | u32 ttl = G_TC_RTTL(skb->tc_verd); |
555353cf DM |
3371 | int result = TC_ACT_OK; |
3372 | struct Qdisc *q; | |
4ec93edb | 3373 | |
de384830 | 3374 | if (unlikely(MAX_RED_LOOP < ttl++)) { |
e87cc472 JP |
3375 | net_warn_ratelimited("Redir loop detected Dropping packet (%d->%d)\n", |
3376 | skb->skb_iif, dev->ifindex); | |
f697c3e8 HX |
3377 | return TC_ACT_SHOT; |
3378 | } | |
1da177e4 | 3379 | |
f697c3e8 HX |
3380 | skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl); |
3381 | skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS); | |
1da177e4 | 3382 | |
83874000 | 3383 | q = rxq->qdisc; |
8d50b53d | 3384 | if (q != &noop_qdisc) { |
83874000 | 3385 | spin_lock(qdisc_lock(q)); |
a9312ae8 DM |
3386 | if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) |
3387 | result = qdisc_enqueue_root(skb, q); | |
83874000 DM |
3388 | spin_unlock(qdisc_lock(q)); |
3389 | } | |
f697c3e8 HX |
3390 | |
3391 | return result; | |
3392 | } | |
86e65da9 | 3393 | |
f697c3e8 HX |
3394 | static inline struct sk_buff *handle_ing(struct sk_buff *skb, |
3395 | struct packet_type **pt_prev, | |
3396 | int *ret, struct net_device *orig_dev) | |
3397 | { | |
24824a09 ED |
3398 | struct netdev_queue *rxq = rcu_dereference(skb->dev->ingress_queue); |
3399 | ||
3400 | if (!rxq || rxq->qdisc == &noop_qdisc) | |
f697c3e8 | 3401 | goto out; |
1da177e4 | 3402 | |
f697c3e8 HX |
3403 | if (*pt_prev) { |
3404 | *ret = deliver_skb(skb, *pt_prev, orig_dev); | |
3405 | *pt_prev = NULL; | |
1da177e4 LT |
3406 | } |
3407 | ||
24824a09 | 3408 | switch (ing_filter(skb, rxq)) { |
f697c3e8 HX |
3409 | case TC_ACT_SHOT: |
3410 | case TC_ACT_STOLEN: | |
3411 | kfree_skb(skb); | |
3412 | return NULL; | |
3413 | } | |
3414 | ||
3415 | out: | |
3416 | skb->tc_verd = 0; | |
3417 | return skb; | |
1da177e4 LT |
3418 | } |
3419 | #endif | |
3420 | ||
ab95bfe0 JP |
3421 | /** |
3422 | * netdev_rx_handler_register - register receive handler | |
3423 | * @dev: device to register a handler for | |
3424 | * @rx_handler: receive handler to register | |
93e2c32b | 3425 | * @rx_handler_data: data pointer that is used by rx handler |
ab95bfe0 JP |
3426 | * |
3427 | * Register a receive hander for a device. This handler will then be | |
3428 | * called from __netif_receive_skb. A negative errno code is returned | |
3429 | * on a failure. | |
3430 | * | |
3431 | * The caller must hold the rtnl_mutex. | |
8a4eb573 JP |
3432 | * |
3433 | * For a general description of rx_handler, see enum rx_handler_result. | |
ab95bfe0 JP |
3434 | */ |
3435 | int netdev_rx_handler_register(struct net_device *dev, | |
93e2c32b JP |
3436 | rx_handler_func_t *rx_handler, |
3437 | void *rx_handler_data) | |
ab95bfe0 JP |
3438 | { |
3439 | ASSERT_RTNL(); | |
3440 | ||
3441 | if (dev->rx_handler) | |
3442 | return -EBUSY; | |
3443 | ||
00cfec37 | 3444 | /* Note: rx_handler_data must be set before rx_handler */ |
93e2c32b | 3445 | rcu_assign_pointer(dev->rx_handler_data, rx_handler_data); |
ab95bfe0 JP |
3446 | rcu_assign_pointer(dev->rx_handler, rx_handler); |
3447 | ||
3448 | return 0; | |
3449 | } | |
3450 | EXPORT_SYMBOL_GPL(netdev_rx_handler_register); | |
3451 | ||
3452 | /** | |
3453 | * netdev_rx_handler_unregister - unregister receive handler | |
3454 | * @dev: device to unregister a handler from | |
3455 | * | |
166ec369 | 3456 | * Unregister a receive handler from a device. |
ab95bfe0 JP |
3457 | * |
3458 | * The caller must hold the rtnl_mutex. | |
3459 | */ | |
3460 | void netdev_rx_handler_unregister(struct net_device *dev) | |
3461 | { | |
3462 | ||
3463 | ASSERT_RTNL(); | |
a9b3cd7f | 3464 | RCU_INIT_POINTER(dev->rx_handler, NULL); |
00cfec37 ED |
3465 | /* a reader seeing a non NULL rx_handler in a rcu_read_lock() |
3466 | * section has a guarantee to see a non NULL rx_handler_data | |
3467 | * as well. | |
3468 | */ | |
3469 | synchronize_net(); | |
a9b3cd7f | 3470 | RCU_INIT_POINTER(dev->rx_handler_data, NULL); |
ab95bfe0 JP |
3471 | } |
3472 | EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister); | |
3473 | ||
b4b9e355 MG |
3474 | /* |
3475 | * Limit the use of PFMEMALLOC reserves to those protocols that implement | |
3476 | * the special handling of PFMEMALLOC skbs. | |
3477 | */ | |
3478 | static bool skb_pfmemalloc_protocol(struct sk_buff *skb) | |
3479 | { | |
3480 | switch (skb->protocol) { | |
3481 | case __constant_htons(ETH_P_ARP): | |
3482 | case __constant_htons(ETH_P_IP): | |
3483 | case __constant_htons(ETH_P_IPV6): | |
3484 | case __constant_htons(ETH_P_8021Q): | |
8ad227ff | 3485 | case __constant_htons(ETH_P_8021AD): |
b4b9e355 MG |
3486 | return true; |
3487 | default: | |
3488 | return false; | |
3489 | } | |
3490 | } | |
3491 | ||
9754e293 | 3492 | static int __netif_receive_skb_core(struct sk_buff *skb, bool pfmemalloc) |
1da177e4 LT |
3493 | { |
3494 | struct packet_type *ptype, *pt_prev; | |
ab95bfe0 | 3495 | rx_handler_func_t *rx_handler; |
f2ccd8fa | 3496 | struct net_device *orig_dev; |
63d8ea7f | 3497 | struct net_device *null_or_dev; |
8a4eb573 | 3498 | bool deliver_exact = false; |
1da177e4 | 3499 | int ret = NET_RX_DROP; |
252e3346 | 3500 | __be16 type; |
1da177e4 | 3501 | |
588f0330 | 3502 | net_timestamp_check(!netdev_tstamp_prequeue, skb); |
81bbb3d4 | 3503 | |
cf66ba58 | 3504 | trace_netif_receive_skb(skb); |
9b22ea56 | 3505 | |
1da177e4 | 3506 | /* if we've gotten here through NAPI, check netpoll */ |
bea3348e | 3507 | if (netpoll_receive_skb(skb)) |
b4b9e355 | 3508 | goto out; |
1da177e4 | 3509 | |
cc9bd5ce | 3510 | orig_dev = skb->dev; |
8f903c70 | 3511 | |
c1d2bbe1 | 3512 | skb_reset_network_header(skb); |
fda55eca ED |
3513 | if (!skb_transport_header_was_set(skb)) |
3514 | skb_reset_transport_header(skb); | |
0b5c9db1 | 3515 | skb_reset_mac_len(skb); |
1da177e4 LT |
3516 | |
3517 | pt_prev = NULL; | |
3518 | ||
3519 | rcu_read_lock(); | |
3520 | ||
63d8ea7f | 3521 | another_round: |
b6858177 | 3522 | skb->skb_iif = skb->dev->ifindex; |
63d8ea7f DM |
3523 | |
3524 | __this_cpu_inc(softnet_data.processed); | |
3525 | ||
8ad227ff PM |
3526 | if (skb->protocol == cpu_to_be16(ETH_P_8021Q) || |
3527 | skb->protocol == cpu_to_be16(ETH_P_8021AD)) { | |
bcc6d479 JP |
3528 | skb = vlan_untag(skb); |
3529 | if (unlikely(!skb)) | |
b4b9e355 | 3530 | goto unlock; |
bcc6d479 JP |
3531 | } |
3532 | ||
1da177e4 LT |
3533 | #ifdef CONFIG_NET_CLS_ACT |
3534 | if (skb->tc_verd & TC_NCLS) { | |
3535 | skb->tc_verd = CLR_TC_NCLS(skb->tc_verd); | |
3536 | goto ncls; | |
3537 | } | |
3538 | #endif | |
3539 | ||
9754e293 | 3540 | if (pfmemalloc) |
b4b9e355 MG |
3541 | goto skip_taps; |
3542 | ||
1da177e4 | 3543 | list_for_each_entry_rcu(ptype, &ptype_all, list) { |
63d8ea7f | 3544 | if (!ptype->dev || ptype->dev == skb->dev) { |
4ec93edb | 3545 | if (pt_prev) |
f2ccd8fa | 3546 | ret = deliver_skb(skb, pt_prev, orig_dev); |
1da177e4 LT |
3547 | pt_prev = ptype; |
3548 | } | |
3549 | } | |
3550 | ||
b4b9e355 | 3551 | skip_taps: |
1da177e4 | 3552 | #ifdef CONFIG_NET_CLS_ACT |
f697c3e8 HX |
3553 | skb = handle_ing(skb, &pt_prev, &ret, orig_dev); |
3554 | if (!skb) | |
b4b9e355 | 3555 | goto unlock; |
1da177e4 LT |
3556 | ncls: |
3557 | #endif | |
3558 | ||
9754e293 | 3559 | if (pfmemalloc && !skb_pfmemalloc_protocol(skb)) |
b4b9e355 MG |
3560 | goto drop; |
3561 | ||
2425717b JF |
3562 | if (vlan_tx_tag_present(skb)) { |
3563 | if (pt_prev) { | |
3564 | ret = deliver_skb(skb, pt_prev, orig_dev); | |
3565 | pt_prev = NULL; | |
3566 | } | |
48cc32d3 | 3567 | if (vlan_do_receive(&skb)) |
2425717b JF |
3568 | goto another_round; |
3569 | else if (unlikely(!skb)) | |
b4b9e355 | 3570 | goto unlock; |
2425717b JF |
3571 | } |
3572 | ||
48cc32d3 | 3573 | rx_handler = rcu_dereference(skb->dev->rx_handler); |
ab95bfe0 JP |
3574 | if (rx_handler) { |
3575 | if (pt_prev) { | |
3576 | ret = deliver_skb(skb, pt_prev, orig_dev); | |
3577 | pt_prev = NULL; | |
3578 | } | |
8a4eb573 JP |
3579 | switch (rx_handler(&skb)) { |
3580 | case RX_HANDLER_CONSUMED: | |
3bc1b1ad | 3581 | ret = NET_RX_SUCCESS; |
b4b9e355 | 3582 | goto unlock; |
8a4eb573 | 3583 | case RX_HANDLER_ANOTHER: |
63d8ea7f | 3584 | goto another_round; |
8a4eb573 JP |
3585 | case RX_HANDLER_EXACT: |
3586 | deliver_exact = true; | |
3587 | case RX_HANDLER_PASS: | |
3588 | break; | |
3589 | default: | |
3590 | BUG(); | |
3591 | } | |
ab95bfe0 | 3592 | } |
1da177e4 | 3593 | |
d4b812de ED |
3594 | if (unlikely(vlan_tx_tag_present(skb))) { |
3595 | if (vlan_tx_tag_get_id(skb)) | |
3596 | skb->pkt_type = PACKET_OTHERHOST; | |
3597 | /* Note: we might in the future use prio bits | |
3598 | * and set skb->priority like in vlan_do_receive() | |
3599 | * For the time being, just ignore Priority Code Point | |
3600 | */ | |
3601 | skb->vlan_tci = 0; | |
3602 | } | |
48cc32d3 | 3603 | |
63d8ea7f | 3604 | /* deliver only exact match when indicated */ |
8a4eb573 | 3605 | null_or_dev = deliver_exact ? skb->dev : NULL; |
1f3c8804 | 3606 | |
1da177e4 | 3607 | type = skb->protocol; |
82d8a867 PE |
3608 | list_for_each_entry_rcu(ptype, |
3609 | &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) { | |
63d8ea7f | 3610 | if (ptype->type == type && |
e3f48d37 JP |
3611 | (ptype->dev == null_or_dev || ptype->dev == skb->dev || |
3612 | ptype->dev == orig_dev)) { | |
4ec93edb | 3613 | if (pt_prev) |
f2ccd8fa | 3614 | ret = deliver_skb(skb, pt_prev, orig_dev); |
1da177e4 LT |
3615 | pt_prev = ptype; |
3616 | } | |
3617 | } | |
3618 | ||
3619 | if (pt_prev) { | |
1080e512 | 3620 | if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC))) |
0e698bf6 | 3621 | goto drop; |
1080e512 MT |
3622 | else |
3623 | ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev); | |
1da177e4 | 3624 | } else { |
b4b9e355 | 3625 | drop: |
caf586e5 | 3626 | atomic_long_inc(&skb->dev->rx_dropped); |
1da177e4 LT |
3627 | kfree_skb(skb); |
3628 | /* Jamal, now you will not able to escape explaining | |
3629 | * me how you were going to use this. :-) | |
3630 | */ | |
3631 | ret = NET_RX_DROP; | |
3632 | } | |
3633 | ||
b4b9e355 | 3634 | unlock: |
1da177e4 | 3635 | rcu_read_unlock(); |
b4b9e355 | 3636 | out: |
9754e293 DM |
3637 | return ret; |
3638 | } | |
3639 | ||
3640 | static int __netif_receive_skb(struct sk_buff *skb) | |
3641 | { | |
3642 | int ret; | |
3643 | ||
3644 | if (sk_memalloc_socks() && skb_pfmemalloc(skb)) { | |
3645 | unsigned long pflags = current->flags; | |
3646 | ||
3647 | /* | |
3648 | * PFMEMALLOC skbs are special, they should | |
3649 | * - be delivered to SOCK_MEMALLOC sockets only | |
3650 | * - stay away from userspace | |
3651 | * - have bounded memory usage | |
3652 | * | |
3653 | * Use PF_MEMALLOC as this saves us from propagating the allocation | |
3654 | * context down to all allocation sites. | |
3655 | */ | |
3656 | current->flags |= PF_MEMALLOC; | |
3657 | ret = __netif_receive_skb_core(skb, true); | |
3658 | tsk_restore_flags(current, pflags, PF_MEMALLOC); | |
3659 | } else | |
3660 | ret = __netif_receive_skb_core(skb, false); | |
3661 | ||
1da177e4 LT |
3662 | return ret; |
3663 | } | |
0a9627f2 TH |
3664 | |
3665 | /** | |
3666 | * netif_receive_skb - process receive buffer from network | |
3667 | * @skb: buffer to process | |
3668 | * | |
3669 | * netif_receive_skb() is the main receive data processing function. | |
3670 | * It always succeeds. The buffer may be dropped during processing | |
3671 | * for congestion control or by the protocol layers. | |
3672 | * | |
3673 | * This function may only be called from softirq context and interrupts | |
3674 | * should be enabled. | |
3675 | * | |
3676 | * Return values (usually ignored): | |
3677 | * NET_RX_SUCCESS: no congestion | |
3678 | * NET_RX_DROP: packet was dropped | |
3679 | */ | |
3680 | int netif_receive_skb(struct sk_buff *skb) | |
3681 | { | |
588f0330 | 3682 | net_timestamp_check(netdev_tstamp_prequeue, skb); |
3b098e2d | 3683 | |
c1f19b51 RC |
3684 | if (skb_defer_rx_timestamp(skb)) |
3685 | return NET_RX_SUCCESS; | |
3686 | ||
df334545 | 3687 | #ifdef CONFIG_RPS |
c5905afb | 3688 | if (static_key_false(&rps_needed)) { |
3b098e2d ED |
3689 | struct rps_dev_flow voidflow, *rflow = &voidflow; |
3690 | int cpu, ret; | |
fec5e652 | 3691 | |
3b098e2d ED |
3692 | rcu_read_lock(); |
3693 | ||
3694 | cpu = get_rps_cpu(skb->dev, skb, &rflow); | |
0a9627f2 | 3695 | |
3b098e2d ED |
3696 | if (cpu >= 0) { |
3697 | ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail); | |
3698 | rcu_read_unlock(); | |
adc9300e | 3699 | return ret; |
3b098e2d | 3700 | } |
adc9300e | 3701 | rcu_read_unlock(); |
fec5e652 | 3702 | } |
1e94d72f | 3703 | #endif |
adc9300e | 3704 | return __netif_receive_skb(skb); |
0a9627f2 | 3705 | } |
d1b19dff | 3706 | EXPORT_SYMBOL(netif_receive_skb); |
1da177e4 | 3707 | |
88751275 ED |
3708 | /* Network device is going away, flush any packets still pending |
3709 | * Called with irqs disabled. | |
3710 | */ | |
152102c7 | 3711 | static void flush_backlog(void *arg) |
6e583ce5 | 3712 | { |
152102c7 | 3713 | struct net_device *dev = arg; |
e36fa2f7 | 3714 | struct softnet_data *sd = &__get_cpu_var(softnet_data); |
6e583ce5 SH |
3715 | struct sk_buff *skb, *tmp; |
3716 | ||
e36fa2f7 | 3717 | rps_lock(sd); |
6e7676c1 | 3718 | skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) { |
6e583ce5 | 3719 | if (skb->dev == dev) { |
e36fa2f7 | 3720 | __skb_unlink(skb, &sd->input_pkt_queue); |
6e583ce5 | 3721 | kfree_skb(skb); |
76cc8b13 | 3722 | input_queue_head_incr(sd); |
6e583ce5 | 3723 | } |
6e7676c1 | 3724 | } |
e36fa2f7 | 3725 | rps_unlock(sd); |
6e7676c1 CG |
3726 | |
3727 | skb_queue_walk_safe(&sd->process_queue, skb, tmp) { | |
3728 | if (skb->dev == dev) { | |
3729 | __skb_unlink(skb, &sd->process_queue); | |
3730 | kfree_skb(skb); | |
76cc8b13 | 3731 | input_queue_head_incr(sd); |
6e7676c1 CG |
3732 | } |
3733 | } | |
6e583ce5 SH |
3734 | } |
3735 | ||
d565b0a1 HX |
3736 | static int napi_gro_complete(struct sk_buff *skb) |
3737 | { | |
22061d80 | 3738 | struct packet_offload *ptype; |
d565b0a1 | 3739 | __be16 type = skb->protocol; |
22061d80 | 3740 | struct list_head *head = &offload_base; |
d565b0a1 HX |
3741 | int err = -ENOENT; |
3742 | ||
c3c7c254 ED |
3743 | BUILD_BUG_ON(sizeof(struct napi_gro_cb) > sizeof(skb->cb)); |
3744 | ||
fc59f9a3 HX |
3745 | if (NAPI_GRO_CB(skb)->count == 1) { |
3746 | skb_shinfo(skb)->gso_size = 0; | |
d565b0a1 | 3747 | goto out; |
fc59f9a3 | 3748 | } |
d565b0a1 HX |
3749 | |
3750 | rcu_read_lock(); | |
3751 | list_for_each_entry_rcu(ptype, head, list) { | |
f191a1d1 | 3752 | if (ptype->type != type || !ptype->callbacks.gro_complete) |
d565b0a1 HX |
3753 | continue; |
3754 | ||
299603e8 | 3755 | err = ptype->callbacks.gro_complete(skb, 0); |
d565b0a1 HX |
3756 | break; |
3757 | } | |
3758 | rcu_read_unlock(); | |
3759 | ||
3760 | if (err) { | |
3761 | WARN_ON(&ptype->list == head); | |
3762 | kfree_skb(skb); | |
3763 | return NET_RX_SUCCESS; | |
3764 | } | |
3765 | ||
3766 | out: | |
d565b0a1 HX |
3767 | return netif_receive_skb(skb); |
3768 | } | |
3769 | ||
2e71a6f8 ED |
3770 | /* napi->gro_list contains packets ordered by age. |
3771 | * youngest packets at the head of it. | |
3772 | * Complete skbs in reverse order to reduce latencies. | |
3773 | */ | |
3774 | void napi_gro_flush(struct napi_struct *napi, bool flush_old) | |
d565b0a1 | 3775 | { |
2e71a6f8 | 3776 | struct sk_buff *skb, *prev = NULL; |
d565b0a1 | 3777 | |
2e71a6f8 ED |
3778 | /* scan list and build reverse chain */ |
3779 | for (skb = napi->gro_list; skb != NULL; skb = skb->next) { | |
3780 | skb->prev = prev; | |
3781 | prev = skb; | |
3782 | } | |
3783 | ||
3784 | for (skb = prev; skb; skb = prev) { | |
d565b0a1 | 3785 | skb->next = NULL; |
2e71a6f8 ED |
3786 | |
3787 | if (flush_old && NAPI_GRO_CB(skb)->age == jiffies) | |
3788 | return; | |
3789 | ||
3790 | prev = skb->prev; | |
d565b0a1 | 3791 | napi_gro_complete(skb); |
2e71a6f8 | 3792 | napi->gro_count--; |
d565b0a1 HX |
3793 | } |
3794 | ||
3795 | napi->gro_list = NULL; | |
3796 | } | |
86cac58b | 3797 | EXPORT_SYMBOL(napi_gro_flush); |
d565b0a1 | 3798 | |
89c5fa33 ED |
3799 | static void gro_list_prepare(struct napi_struct *napi, struct sk_buff *skb) |
3800 | { | |
3801 | struct sk_buff *p; | |
3802 | unsigned int maclen = skb->dev->hard_header_len; | |
3803 | ||
3804 | for (p = napi->gro_list; p; p = p->next) { | |
3805 | unsigned long diffs; | |
3806 | ||
3807 | diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev; | |
3808 | diffs |= p->vlan_tci ^ skb->vlan_tci; | |
3809 | if (maclen == ETH_HLEN) | |
3810 | diffs |= compare_ether_header(skb_mac_header(p), | |
3811 | skb_gro_mac_header(skb)); | |
3812 | else if (!diffs) | |
3813 | diffs = memcmp(skb_mac_header(p), | |
3814 | skb_gro_mac_header(skb), | |
3815 | maclen); | |
3816 | NAPI_GRO_CB(p)->same_flow = !diffs; | |
3817 | NAPI_GRO_CB(p)->flush = 0; | |
3818 | } | |
3819 | } | |
3820 | ||
299603e8 JC |
3821 | static void skb_gro_reset_offset(struct sk_buff *skb) |
3822 | { | |
3823 | const struct skb_shared_info *pinfo = skb_shinfo(skb); | |
3824 | const skb_frag_t *frag0 = &pinfo->frags[0]; | |
3825 | ||
3826 | NAPI_GRO_CB(skb)->data_offset = 0; | |
3827 | NAPI_GRO_CB(skb)->frag0 = NULL; | |
3828 | NAPI_GRO_CB(skb)->frag0_len = 0; | |
3829 | ||
3830 | if (skb_mac_header(skb) == skb_tail_pointer(skb) && | |
3831 | pinfo->nr_frags && | |
3832 | !PageHighMem(skb_frag_page(frag0))) { | |
3833 | NAPI_GRO_CB(skb)->frag0 = skb_frag_address(frag0); | |
3834 | NAPI_GRO_CB(skb)->frag0_len = skb_frag_size(frag0); | |
3835 | } | |
3836 | } | |
3837 | ||
bb728820 | 3838 | static enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb) |
d565b0a1 HX |
3839 | { |
3840 | struct sk_buff **pp = NULL; | |
22061d80 | 3841 | struct packet_offload *ptype; |
d565b0a1 | 3842 | __be16 type = skb->protocol; |
22061d80 | 3843 | struct list_head *head = &offload_base; |
0da2afd5 | 3844 | int same_flow; |
5b252f0c | 3845 | enum gro_result ret; |
d565b0a1 | 3846 | |
ce9e76c8 | 3847 | if (!(skb->dev->features & NETIF_F_GRO) || netpoll_rx_on(skb)) |
d565b0a1 HX |
3848 | goto normal; |
3849 | ||
21dc3301 | 3850 | if (skb_is_gso(skb) || skb_has_frag_list(skb)) |
f17f5c91 HX |
3851 | goto normal; |
3852 | ||
299603e8 | 3853 | skb_gro_reset_offset(skb); |
89c5fa33 ED |
3854 | gro_list_prepare(napi, skb); |
3855 | ||
d565b0a1 HX |
3856 | rcu_read_lock(); |
3857 | list_for_each_entry_rcu(ptype, head, list) { | |
f191a1d1 | 3858 | if (ptype->type != type || !ptype->callbacks.gro_receive) |
d565b0a1 HX |
3859 | continue; |
3860 | ||
86911732 | 3861 | skb_set_network_header(skb, skb_gro_offset(skb)); |
efd9450e | 3862 | skb_reset_mac_len(skb); |
d565b0a1 HX |
3863 | NAPI_GRO_CB(skb)->same_flow = 0; |
3864 | NAPI_GRO_CB(skb)->flush = 0; | |
5d38a079 | 3865 | NAPI_GRO_CB(skb)->free = 0; |
d565b0a1 | 3866 | |
f191a1d1 | 3867 | pp = ptype->callbacks.gro_receive(&napi->gro_list, skb); |
d565b0a1 HX |
3868 | break; |
3869 | } | |
3870 | rcu_read_unlock(); | |
3871 | ||
3872 | if (&ptype->list == head) | |
3873 | goto normal; | |
3874 | ||
0da2afd5 | 3875 | same_flow = NAPI_GRO_CB(skb)->same_flow; |
5d0d9be8 | 3876 | ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED; |
0da2afd5 | 3877 | |
d565b0a1 HX |
3878 | if (pp) { |
3879 | struct sk_buff *nskb = *pp; | |
3880 | ||
3881 | *pp = nskb->next; | |
3882 | nskb->next = NULL; | |
3883 | napi_gro_complete(nskb); | |
4ae5544f | 3884 | napi->gro_count--; |
d565b0a1 HX |
3885 | } |
3886 | ||
0da2afd5 | 3887 | if (same_flow) |
d565b0a1 HX |
3888 | goto ok; |
3889 | ||
4ae5544f | 3890 | if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS) |
d565b0a1 | 3891 | goto normal; |
d565b0a1 | 3892 | |
4ae5544f | 3893 | napi->gro_count++; |
d565b0a1 | 3894 | NAPI_GRO_CB(skb)->count = 1; |
2e71a6f8 | 3895 | NAPI_GRO_CB(skb)->age = jiffies; |
86911732 | 3896 | skb_shinfo(skb)->gso_size = skb_gro_len(skb); |
d565b0a1 HX |
3897 | skb->next = napi->gro_list; |
3898 | napi->gro_list = skb; | |
5d0d9be8 | 3899 | ret = GRO_HELD; |
d565b0a1 | 3900 | |
ad0f9904 | 3901 | pull: |
cb18978c HX |
3902 | if (skb_headlen(skb) < skb_gro_offset(skb)) { |
3903 | int grow = skb_gro_offset(skb) - skb_headlen(skb); | |
3904 | ||
3905 | BUG_ON(skb->end - skb->tail < grow); | |
3906 | ||
3907 | memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow); | |
3908 | ||
3909 | skb->tail += grow; | |
3910 | skb->data_len -= grow; | |
3911 | ||
3912 | skb_shinfo(skb)->frags[0].page_offset += grow; | |
9e903e08 | 3913 | skb_frag_size_sub(&skb_shinfo(skb)->frags[0], grow); |
cb18978c | 3914 | |
9e903e08 | 3915 | if (unlikely(!skb_frag_size(&skb_shinfo(skb)->frags[0]))) { |
ea2ab693 | 3916 | skb_frag_unref(skb, 0); |
cb18978c HX |
3917 | memmove(skb_shinfo(skb)->frags, |
3918 | skb_shinfo(skb)->frags + 1, | |
e5093aec | 3919 | --skb_shinfo(skb)->nr_frags * sizeof(skb_frag_t)); |
cb18978c | 3920 | } |
ad0f9904 HX |
3921 | } |
3922 | ||
d565b0a1 | 3923 | ok: |
5d0d9be8 | 3924 | return ret; |
d565b0a1 HX |
3925 | |
3926 | normal: | |
ad0f9904 HX |
3927 | ret = GRO_NORMAL; |
3928 | goto pull; | |
5d38a079 | 3929 | } |
96e93eab | 3930 | |
5d38a079 | 3931 | |
bb728820 | 3932 | static gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb) |
5d38a079 | 3933 | { |
5d0d9be8 HX |
3934 | switch (ret) { |
3935 | case GRO_NORMAL: | |
c7c4b3b6 BH |
3936 | if (netif_receive_skb(skb)) |
3937 | ret = GRO_DROP; | |
3938 | break; | |
5d38a079 | 3939 | |
5d0d9be8 | 3940 | case GRO_DROP: |
5d38a079 HX |
3941 | kfree_skb(skb); |
3942 | break; | |
5b252f0c | 3943 | |
daa86548 | 3944 | case GRO_MERGED_FREE: |
d7e8883c ED |
3945 | if (NAPI_GRO_CB(skb)->free == NAPI_GRO_FREE_STOLEN_HEAD) |
3946 | kmem_cache_free(skbuff_head_cache, skb); | |
3947 | else | |
3948 | __kfree_skb(skb); | |
daa86548 ED |
3949 | break; |
3950 | ||
5b252f0c BH |
3951 | case GRO_HELD: |
3952 | case GRO_MERGED: | |
3953 | break; | |
5d38a079 HX |
3954 | } |
3955 | ||
c7c4b3b6 | 3956 | return ret; |
5d0d9be8 | 3957 | } |
5d0d9be8 | 3958 | |
c7c4b3b6 | 3959 | gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb) |
5d0d9be8 | 3960 | { |
89c5fa33 | 3961 | return napi_skb_finish(dev_gro_receive(napi, skb), skb); |
d565b0a1 HX |
3962 | } |
3963 | EXPORT_SYMBOL(napi_gro_receive); | |
3964 | ||
d0c2b0d2 | 3965 | static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb) |
96e93eab | 3966 | { |
96e93eab | 3967 | __skb_pull(skb, skb_headlen(skb)); |
2a2a459e ED |
3968 | /* restore the reserve we had after netdev_alloc_skb_ip_align() */ |
3969 | skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN - skb_headroom(skb)); | |
3701e513 | 3970 | skb->vlan_tci = 0; |
66c46d74 | 3971 | skb->dev = napi->dev; |
6d152e23 | 3972 | skb->skb_iif = 0; |
96e93eab HX |
3973 | |
3974 | napi->skb = skb; | |
3975 | } | |
96e93eab | 3976 | |
76620aaf | 3977 | struct sk_buff *napi_get_frags(struct napi_struct *napi) |
5d38a079 | 3978 | { |
5d38a079 | 3979 | struct sk_buff *skb = napi->skb; |
5d38a079 HX |
3980 | |
3981 | if (!skb) { | |
89d71a66 | 3982 | skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD); |
84b9cd63 | 3983 | napi->skb = skb; |
80595d59 | 3984 | } |
96e93eab HX |
3985 | return skb; |
3986 | } | |
76620aaf | 3987 | EXPORT_SYMBOL(napi_get_frags); |
96e93eab | 3988 | |
bb728820 | 3989 | static gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb, |
c7c4b3b6 | 3990 | gro_result_t ret) |
96e93eab | 3991 | { |
5d0d9be8 HX |
3992 | switch (ret) { |
3993 | case GRO_NORMAL: | |
299603e8 | 3994 | if (netif_receive_skb(skb)) |
c7c4b3b6 | 3995 | ret = GRO_DROP; |
86911732 | 3996 | break; |
5d38a079 | 3997 | |
5d0d9be8 | 3998 | case GRO_DROP: |
5d0d9be8 HX |
3999 | case GRO_MERGED_FREE: |
4000 | napi_reuse_skb(napi, skb); | |
4001 | break; | |
5b252f0c | 4002 | |
299603e8 | 4003 | case GRO_HELD: |
5b252f0c BH |
4004 | case GRO_MERGED: |
4005 | break; | |
5d0d9be8 | 4006 | } |
5d38a079 | 4007 | |
c7c4b3b6 | 4008 | return ret; |
5d38a079 | 4009 | } |
5d0d9be8 | 4010 | |
4adb9c4a | 4011 | static struct sk_buff *napi_frags_skb(struct napi_struct *napi) |
76620aaf HX |
4012 | { |
4013 | struct sk_buff *skb = napi->skb; | |
76620aaf HX |
4014 | |
4015 | napi->skb = NULL; | |
4016 | ||
299603e8 JC |
4017 | if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr)))) { |
4018 | napi_reuse_skb(napi, skb); | |
4019 | return NULL; | |
76620aaf | 4020 | } |
299603e8 | 4021 | skb->protocol = eth_type_trans(skb, skb->dev); |
76620aaf | 4022 | |
76620aaf HX |
4023 | return skb; |
4024 | } | |
76620aaf | 4025 | |
c7c4b3b6 | 4026 | gro_result_t napi_gro_frags(struct napi_struct *napi) |
5d0d9be8 | 4027 | { |
76620aaf | 4028 | struct sk_buff *skb = napi_frags_skb(napi); |
5d0d9be8 HX |
4029 | |
4030 | if (!skb) | |
c7c4b3b6 | 4031 | return GRO_DROP; |
5d0d9be8 | 4032 | |
89c5fa33 | 4033 | return napi_frags_finish(napi, skb, dev_gro_receive(napi, skb)); |
5d0d9be8 | 4034 | } |
5d38a079 HX |
4035 | EXPORT_SYMBOL(napi_gro_frags); |
4036 | ||
e326bed2 ED |
4037 | /* |
4038 | * net_rps_action sends any pending IPI's for rps. | |
4039 | * Note: called with local irq disabled, but exits with local irq enabled. | |
4040 | */ | |
4041 | static void net_rps_action_and_irq_enable(struct softnet_data *sd) | |
4042 | { | |
4043 | #ifdef CONFIG_RPS | |
4044 | struct softnet_data *remsd = sd->rps_ipi_list; | |
4045 | ||
4046 | if (remsd) { | |
4047 | sd->rps_ipi_list = NULL; | |
4048 | ||
4049 | local_irq_enable(); | |
4050 | ||
4051 | /* Send pending IPI's to kick RPS processing on remote cpus. */ | |
4052 | while (remsd) { | |
4053 | struct softnet_data *next = remsd->rps_ipi_next; | |
4054 | ||
4055 | if (cpu_online(remsd->cpu)) | |
4056 | __smp_call_function_single(remsd->cpu, | |
4057 | &remsd->csd, 0); | |
4058 | remsd = next; | |
4059 | } | |
4060 | } else | |
4061 | #endif | |
4062 | local_irq_enable(); | |
4063 | } | |
4064 | ||
bea3348e | 4065 | static int process_backlog(struct napi_struct *napi, int quota) |
1da177e4 LT |
4066 | { |
4067 | int work = 0; | |
eecfd7c4 | 4068 | struct softnet_data *sd = container_of(napi, struct softnet_data, backlog); |
1da177e4 | 4069 | |
e326bed2 ED |
4070 | #ifdef CONFIG_RPS |
4071 | /* Check if we have pending ipi, its better to send them now, | |
4072 | * not waiting net_rx_action() end. | |
4073 | */ | |
4074 | if (sd->rps_ipi_list) { | |
4075 | local_irq_disable(); | |
4076 | net_rps_action_and_irq_enable(sd); | |
4077 | } | |
4078 | #endif | |
bea3348e | 4079 | napi->weight = weight_p; |
6e7676c1 CG |
4080 | local_irq_disable(); |
4081 | while (work < quota) { | |
1da177e4 | 4082 | struct sk_buff *skb; |
6e7676c1 CG |
4083 | unsigned int qlen; |
4084 | ||
4085 | while ((skb = __skb_dequeue(&sd->process_queue))) { | |
4086 | local_irq_enable(); | |
4087 | __netif_receive_skb(skb); | |
6e7676c1 | 4088 | local_irq_disable(); |
76cc8b13 TH |
4089 | input_queue_head_incr(sd); |
4090 | if (++work >= quota) { | |
4091 | local_irq_enable(); | |
4092 | return work; | |
4093 | } | |
6e7676c1 | 4094 | } |
1da177e4 | 4095 | |
e36fa2f7 | 4096 | rps_lock(sd); |
6e7676c1 | 4097 | qlen = skb_queue_len(&sd->input_pkt_queue); |
76cc8b13 | 4098 | if (qlen) |
6e7676c1 CG |
4099 | skb_queue_splice_tail_init(&sd->input_pkt_queue, |
4100 | &sd->process_queue); | |
76cc8b13 | 4101 | |
6e7676c1 | 4102 | if (qlen < quota - work) { |
eecfd7c4 ED |
4103 | /* |
4104 | * Inline a custom version of __napi_complete(). | |
4105 | * only current cpu owns and manipulates this napi, | |
4106 | * and NAPI_STATE_SCHED is the only possible flag set on backlog. | |
4107 | * we can use a plain write instead of clear_bit(), | |
4108 | * and we dont need an smp_mb() memory barrier. | |
4109 | */ | |
4110 | list_del(&napi->poll_list); | |
4111 | napi->state = 0; | |
4112 | ||
6e7676c1 | 4113 | quota = work + qlen; |
bea3348e | 4114 | } |
e36fa2f7 | 4115 | rps_unlock(sd); |
6e7676c1 CG |
4116 | } |
4117 | local_irq_enable(); | |
1da177e4 | 4118 | |
bea3348e SH |
4119 | return work; |
4120 | } | |
1da177e4 | 4121 | |
bea3348e SH |
4122 | /** |
4123 | * __napi_schedule - schedule for receive | |
c4ea43c5 | 4124 | * @n: entry to schedule |
bea3348e SH |
4125 | * |
4126 | * The entry's receive function will be scheduled to run | |
4127 | */ | |
b5606c2d | 4128 | void __napi_schedule(struct napi_struct *n) |
bea3348e SH |
4129 | { |
4130 | unsigned long flags; | |
1da177e4 | 4131 | |
bea3348e | 4132 | local_irq_save(flags); |
eecfd7c4 | 4133 | ____napi_schedule(&__get_cpu_var(softnet_data), n); |
bea3348e | 4134 | local_irq_restore(flags); |
1da177e4 | 4135 | } |
bea3348e SH |
4136 | EXPORT_SYMBOL(__napi_schedule); |
4137 | ||
d565b0a1 HX |
4138 | void __napi_complete(struct napi_struct *n) |
4139 | { | |
4140 | BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state)); | |
4141 | BUG_ON(n->gro_list); | |
4142 | ||
4143 | list_del(&n->poll_list); | |
4144 | smp_mb__before_clear_bit(); | |
4145 | clear_bit(NAPI_STATE_SCHED, &n->state); | |
4146 | } | |
4147 | EXPORT_SYMBOL(__napi_complete); | |
4148 | ||
4149 | void napi_complete(struct napi_struct *n) | |
4150 | { | |
4151 | unsigned long flags; | |
4152 | ||
4153 | /* | |
4154 | * don't let napi dequeue from the cpu poll list | |
4155 | * just in case its running on a different cpu | |
4156 | */ | |
4157 | if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state))) | |
4158 | return; | |
4159 | ||
2e71a6f8 | 4160 | napi_gro_flush(n, false); |
d565b0a1 HX |
4161 | local_irq_save(flags); |
4162 | __napi_complete(n); | |
4163 | local_irq_restore(flags); | |
4164 | } | |
4165 | EXPORT_SYMBOL(napi_complete); | |
4166 | ||
af12fa6e ET |
4167 | /* must be called under rcu_read_lock(), as we dont take a reference */ |
4168 | struct napi_struct *napi_by_id(unsigned int napi_id) | |
4169 | { | |
4170 | unsigned int hash = napi_id % HASH_SIZE(napi_hash); | |
4171 | struct napi_struct *napi; | |
4172 | ||
4173 | hlist_for_each_entry_rcu(napi, &napi_hash[hash], napi_hash_node) | |
4174 | if (napi->napi_id == napi_id) | |
4175 | return napi; | |
4176 | ||
4177 | return NULL; | |
4178 | } | |
4179 | EXPORT_SYMBOL_GPL(napi_by_id); | |
4180 | ||
4181 | void napi_hash_add(struct napi_struct *napi) | |
4182 | { | |
4183 | if (!test_and_set_bit(NAPI_STATE_HASHED, &napi->state)) { | |
4184 | ||
4185 | spin_lock(&napi_hash_lock); | |
4186 | ||
4187 | /* 0 is not a valid id, we also skip an id that is taken | |
4188 | * we expect both events to be extremely rare | |
4189 | */ | |
4190 | napi->napi_id = 0; | |
4191 | while (!napi->napi_id) { | |
4192 | napi->napi_id = ++napi_gen_id; | |
4193 | if (napi_by_id(napi->napi_id)) | |
4194 | napi->napi_id = 0; | |
4195 | } | |
4196 | ||
4197 | hlist_add_head_rcu(&napi->napi_hash_node, | |
4198 | &napi_hash[napi->napi_id % HASH_SIZE(napi_hash)]); | |
4199 | ||
4200 | spin_unlock(&napi_hash_lock); | |
4201 | } | |
4202 | } | |
4203 | EXPORT_SYMBOL_GPL(napi_hash_add); | |
4204 | ||
4205 | /* Warning : caller is responsible to make sure rcu grace period | |
4206 | * is respected before freeing memory containing @napi | |
4207 | */ | |
4208 | void napi_hash_del(struct napi_struct *napi) | |
4209 | { | |
4210 | spin_lock(&napi_hash_lock); | |
4211 | ||
4212 | if (test_and_clear_bit(NAPI_STATE_HASHED, &napi->state)) | |
4213 | hlist_del_rcu(&napi->napi_hash_node); | |
4214 | ||
4215 | spin_unlock(&napi_hash_lock); | |
4216 | } | |
4217 | EXPORT_SYMBOL_GPL(napi_hash_del); | |
4218 | ||
d565b0a1 HX |
4219 | void netif_napi_add(struct net_device *dev, struct napi_struct *napi, |
4220 | int (*poll)(struct napi_struct *, int), int weight) | |
4221 | { | |
4222 | INIT_LIST_HEAD(&napi->poll_list); | |
4ae5544f | 4223 | napi->gro_count = 0; |
d565b0a1 | 4224 | napi->gro_list = NULL; |
5d38a079 | 4225 | napi->skb = NULL; |
d565b0a1 | 4226 | napi->poll = poll; |
82dc3c63 ED |
4227 | if (weight > NAPI_POLL_WEIGHT) |
4228 | pr_err_once("netif_napi_add() called with weight %d on device %s\n", | |
4229 | weight, dev->name); | |
d565b0a1 HX |
4230 | napi->weight = weight; |
4231 | list_add(&napi->dev_list, &dev->napi_list); | |
d565b0a1 | 4232 | napi->dev = dev; |
5d38a079 | 4233 | #ifdef CONFIG_NETPOLL |
d565b0a1 HX |
4234 | spin_lock_init(&napi->poll_lock); |
4235 | napi->poll_owner = -1; | |
4236 | #endif | |
4237 | set_bit(NAPI_STATE_SCHED, &napi->state); | |
4238 | } | |
4239 | EXPORT_SYMBOL(netif_napi_add); | |
4240 | ||
4241 | void netif_napi_del(struct napi_struct *napi) | |
4242 | { | |
4243 | struct sk_buff *skb, *next; | |
4244 | ||
d7b06636 | 4245 | list_del_init(&napi->dev_list); |
76620aaf | 4246 | napi_free_frags(napi); |
d565b0a1 HX |
4247 | |
4248 | for (skb = napi->gro_list; skb; skb = next) { | |
4249 | next = skb->next; | |
4250 | skb->next = NULL; | |
4251 | kfree_skb(skb); | |
4252 | } | |
4253 | ||
4254 | napi->gro_list = NULL; | |
4ae5544f | 4255 | napi->gro_count = 0; |
d565b0a1 HX |
4256 | } |
4257 | EXPORT_SYMBOL(netif_napi_del); | |
4258 | ||
1da177e4 LT |
4259 | static void net_rx_action(struct softirq_action *h) |
4260 | { | |
e326bed2 | 4261 | struct softnet_data *sd = &__get_cpu_var(softnet_data); |
24f8b238 | 4262 | unsigned long time_limit = jiffies + 2; |
51b0bded | 4263 | int budget = netdev_budget; |
53fb95d3 MM |
4264 | void *have; |
4265 | ||
1da177e4 LT |
4266 | local_irq_disable(); |
4267 | ||
e326bed2 | 4268 | while (!list_empty(&sd->poll_list)) { |
bea3348e SH |
4269 | struct napi_struct *n; |
4270 | int work, weight; | |
1da177e4 | 4271 | |
bea3348e | 4272 | /* If softirq window is exhuasted then punt. |
24f8b238 SH |
4273 | * Allow this to run for 2 jiffies since which will allow |
4274 | * an average latency of 1.5/HZ. | |
bea3348e | 4275 | */ |
d1f41b67 | 4276 | if (unlikely(budget <= 0 || time_after_eq(jiffies, time_limit))) |
1da177e4 LT |
4277 | goto softnet_break; |
4278 | ||
4279 | local_irq_enable(); | |
4280 | ||
bea3348e SH |
4281 | /* Even though interrupts have been re-enabled, this |
4282 | * access is safe because interrupts can only add new | |
4283 | * entries to the tail of this list, and only ->poll() | |
4284 | * calls can remove this head entry from the list. | |
4285 | */ | |
e326bed2 | 4286 | n = list_first_entry(&sd->poll_list, struct napi_struct, poll_list); |
1da177e4 | 4287 | |
bea3348e SH |
4288 | have = netpoll_poll_lock(n); |
4289 | ||
4290 | weight = n->weight; | |
4291 | ||
0a7606c1 DM |
4292 | /* This NAPI_STATE_SCHED test is for avoiding a race |
4293 | * with netpoll's poll_napi(). Only the entity which | |
4294 | * obtains the lock and sees NAPI_STATE_SCHED set will | |
4295 | * actually make the ->poll() call. Therefore we avoid | |
25985edc | 4296 | * accidentally calling ->poll() when NAPI is not scheduled. |
0a7606c1 DM |
4297 | */ |
4298 | work = 0; | |
4ea7e386 | 4299 | if (test_bit(NAPI_STATE_SCHED, &n->state)) { |
0a7606c1 | 4300 | work = n->poll(n, weight); |
4ea7e386 NH |
4301 | trace_napi_poll(n); |
4302 | } | |
bea3348e SH |
4303 | |
4304 | WARN_ON_ONCE(work > weight); | |
4305 | ||
4306 | budget -= work; | |
4307 | ||
4308 | local_irq_disable(); | |
4309 | ||
4310 | /* Drivers must not modify the NAPI state if they | |
4311 | * consume the entire weight. In such cases this code | |
4312 | * still "owns" the NAPI instance and therefore can | |
4313 | * move the instance around on the list at-will. | |
4314 | */ | |
fed17f30 | 4315 | if (unlikely(work == weight)) { |
ff780cd8 HX |
4316 | if (unlikely(napi_disable_pending(n))) { |
4317 | local_irq_enable(); | |
4318 | napi_complete(n); | |
4319 | local_irq_disable(); | |
2e71a6f8 ED |
4320 | } else { |
4321 | if (n->gro_list) { | |
4322 | /* flush too old packets | |
4323 | * If HZ < 1000, flush all packets. | |
4324 | */ | |
4325 | local_irq_enable(); | |
4326 | napi_gro_flush(n, HZ >= 1000); | |
4327 | local_irq_disable(); | |
4328 | } | |
e326bed2 | 4329 | list_move_tail(&n->poll_list, &sd->poll_list); |
2e71a6f8 | 4330 | } |
fed17f30 | 4331 | } |
bea3348e SH |
4332 | |
4333 | netpoll_poll_unlock(have); | |
1da177e4 LT |
4334 | } |
4335 | out: | |
e326bed2 | 4336 | net_rps_action_and_irq_enable(sd); |
0a9627f2 | 4337 | |
db217334 CL |
4338 | #ifdef CONFIG_NET_DMA |
4339 | /* | |
4340 | * There may not be any more sk_buffs coming right now, so push | |
4341 | * any pending DMA copies to hardware | |
4342 | */ | |
2ba05622 | 4343 | dma_issue_pending_all(); |
db217334 | 4344 | #endif |
bea3348e | 4345 | |
1da177e4 LT |
4346 | return; |
4347 | ||
4348 | softnet_break: | |
dee42870 | 4349 | sd->time_squeeze++; |
1da177e4 LT |
4350 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); |
4351 | goto out; | |
4352 | } | |
4353 | ||
aa9d8560 | 4354 | struct netdev_adjacent { |
9ff162a8 | 4355 | struct net_device *dev; |
5d261913 VF |
4356 | |
4357 | /* upper master flag, there can only be one master device per list */ | |
9ff162a8 | 4358 | bool master; |
5d261913 | 4359 | |
5d261913 VF |
4360 | /* counter for the number of times this device was added to us */ |
4361 | u16 ref_nr; | |
4362 | ||
402dae96 VF |
4363 | /* private field for the users */ |
4364 | void *private; | |
4365 | ||
9ff162a8 JP |
4366 | struct list_head list; |
4367 | struct rcu_head rcu; | |
9ff162a8 JP |
4368 | }; |
4369 | ||
5249dec7 VF |
4370 | static struct netdev_adjacent *__netdev_find_adj_rcu(struct net_device *dev, |
4371 | struct net_device *adj_dev, | |
4372 | struct list_head *adj_list) | |
4373 | { | |
4374 | struct netdev_adjacent *adj; | |
4375 | ||
4376 | list_for_each_entry_rcu(adj, adj_list, list) { | |
4377 | if (adj->dev == adj_dev) | |
4378 | return adj; | |
4379 | } | |
4380 | return NULL; | |
4381 | } | |
4382 | ||
5d261913 VF |
4383 | static struct netdev_adjacent *__netdev_find_adj(struct net_device *dev, |
4384 | struct net_device *adj_dev, | |
2f268f12 | 4385 | struct list_head *adj_list) |
9ff162a8 | 4386 | { |
5d261913 | 4387 | struct netdev_adjacent *adj; |
5d261913 | 4388 | |
2f268f12 | 4389 | list_for_each_entry(adj, adj_list, list) { |
5d261913 VF |
4390 | if (adj->dev == adj_dev) |
4391 | return adj; | |
9ff162a8 JP |
4392 | } |
4393 | return NULL; | |
4394 | } | |
4395 | ||
4396 | /** | |
4397 | * netdev_has_upper_dev - Check if device is linked to an upper device | |
4398 | * @dev: device | |
4399 | * @upper_dev: upper device to check | |
4400 | * | |
4401 | * Find out if a device is linked to specified upper device and return true | |
4402 | * in case it is. Note that this checks only immediate upper device, | |
4403 | * not through a complete stack of devices. The caller must hold the RTNL lock. | |
4404 | */ | |
4405 | bool netdev_has_upper_dev(struct net_device *dev, | |
4406 | struct net_device *upper_dev) | |
4407 | { | |
4408 | ASSERT_RTNL(); | |
4409 | ||
2f268f12 | 4410 | return __netdev_find_adj(dev, upper_dev, &dev->all_adj_list.upper); |
9ff162a8 JP |
4411 | } |
4412 | EXPORT_SYMBOL(netdev_has_upper_dev); | |
4413 | ||
4414 | /** | |
4415 | * netdev_has_any_upper_dev - Check if device is linked to some device | |
4416 | * @dev: device | |
4417 | * | |
4418 | * Find out if a device is linked to an upper device and return true in case | |
4419 | * it is. The caller must hold the RTNL lock. | |
4420 | */ | |
4421 | bool netdev_has_any_upper_dev(struct net_device *dev) | |
4422 | { | |
4423 | ASSERT_RTNL(); | |
4424 | ||
2f268f12 | 4425 | return !list_empty(&dev->all_adj_list.upper); |
9ff162a8 JP |
4426 | } |
4427 | EXPORT_SYMBOL(netdev_has_any_upper_dev); | |
4428 | ||
4429 | /** | |
4430 | * netdev_master_upper_dev_get - Get master upper device | |
4431 | * @dev: device | |
4432 | * | |
4433 | * Find a master upper device and return pointer to it or NULL in case | |
4434 | * it's not there. The caller must hold the RTNL lock. | |
4435 | */ | |
4436 | struct net_device *netdev_master_upper_dev_get(struct net_device *dev) | |
4437 | { | |
aa9d8560 | 4438 | struct netdev_adjacent *upper; |
9ff162a8 JP |
4439 | |
4440 | ASSERT_RTNL(); | |
4441 | ||
2f268f12 | 4442 | if (list_empty(&dev->adj_list.upper)) |
9ff162a8 JP |
4443 | return NULL; |
4444 | ||
2f268f12 | 4445 | upper = list_first_entry(&dev->adj_list.upper, |
aa9d8560 | 4446 | struct netdev_adjacent, list); |
9ff162a8 JP |
4447 | if (likely(upper->master)) |
4448 | return upper->dev; | |
4449 | return NULL; | |
4450 | } | |
4451 | EXPORT_SYMBOL(netdev_master_upper_dev_get); | |
4452 | ||
b6ccba4c VF |
4453 | void *netdev_adjacent_get_private(struct list_head *adj_list) |
4454 | { | |
4455 | struct netdev_adjacent *adj; | |
4456 | ||
4457 | adj = list_entry(adj_list, struct netdev_adjacent, list); | |
4458 | ||
4459 | return adj->private; | |
4460 | } | |
4461 | EXPORT_SYMBOL(netdev_adjacent_get_private); | |
4462 | ||
31088a11 VF |
4463 | /** |
4464 | * netdev_all_upper_get_next_dev_rcu - Get the next dev from upper list | |
48311f46 VF |
4465 | * @dev: device |
4466 | * @iter: list_head ** of the current position | |
4467 | * | |
4468 | * Gets the next device from the dev's upper list, starting from iter | |
4469 | * position. The caller must hold RCU read lock. | |
4470 | */ | |
2f268f12 VF |
4471 | struct net_device *netdev_all_upper_get_next_dev_rcu(struct net_device *dev, |
4472 | struct list_head **iter) | |
48311f46 VF |
4473 | { |
4474 | struct netdev_adjacent *upper; | |
4475 | ||
4476 | WARN_ON_ONCE(!rcu_read_lock_held()); | |
4477 | ||
4478 | upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); | |
4479 | ||
2f268f12 | 4480 | if (&upper->list == &dev->all_adj_list.upper) |
48311f46 VF |
4481 | return NULL; |
4482 | ||
4483 | *iter = &upper->list; | |
4484 | ||
4485 | return upper->dev; | |
4486 | } | |
2f268f12 | 4487 | EXPORT_SYMBOL(netdev_all_upper_get_next_dev_rcu); |
48311f46 | 4488 | |
31088a11 VF |
4489 | /** |
4490 | * netdev_lower_get_next_private - Get the next ->private from the | |
4491 | * lower neighbour list | |
4492 | * @dev: device | |
4493 | * @iter: list_head ** of the current position | |
4494 | * | |
4495 | * Gets the next netdev_adjacent->private from the dev's lower neighbour | |
4496 | * list, starting from iter position. The caller must hold either hold the | |
4497 | * RTNL lock or its own locking that guarantees that the neighbour lower | |
4498 | * list will remain unchainged. | |
4499 | */ | |
4500 | void *netdev_lower_get_next_private(struct net_device *dev, | |
4501 | struct list_head **iter) | |
4502 | { | |
4503 | struct netdev_adjacent *lower; | |
4504 | ||
4505 | lower = list_entry(*iter, struct netdev_adjacent, list); | |
4506 | ||
4507 | if (&lower->list == &dev->adj_list.lower) | |
4508 | return NULL; | |
4509 | ||
4510 | if (iter) | |
4511 | *iter = lower->list.next; | |
4512 | ||
4513 | return lower->private; | |
4514 | } | |
4515 | EXPORT_SYMBOL(netdev_lower_get_next_private); | |
4516 | ||
4517 | /** | |
4518 | * netdev_lower_get_next_private_rcu - Get the next ->private from the | |
4519 | * lower neighbour list, RCU | |
4520 | * variant | |
4521 | * @dev: device | |
4522 | * @iter: list_head ** of the current position | |
4523 | * | |
4524 | * Gets the next netdev_adjacent->private from the dev's lower neighbour | |
4525 | * list, starting from iter position. The caller must hold RCU read lock. | |
4526 | */ | |
4527 | void *netdev_lower_get_next_private_rcu(struct net_device *dev, | |
4528 | struct list_head **iter) | |
4529 | { | |
4530 | struct netdev_adjacent *lower; | |
4531 | ||
4532 | WARN_ON_ONCE(!rcu_read_lock_held()); | |
4533 | ||
4534 | lower = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); | |
4535 | ||
4536 | if (&lower->list == &dev->adj_list.lower) | |
4537 | return NULL; | |
4538 | ||
4539 | if (iter) | |
4540 | *iter = &lower->list; | |
4541 | ||
4542 | return lower->private; | |
4543 | } | |
4544 | EXPORT_SYMBOL(netdev_lower_get_next_private_rcu); | |
4545 | ||
e001bfad | 4546 | /** |
4547 | * netdev_lower_get_first_private_rcu - Get the first ->private from the | |
4548 | * lower neighbour list, RCU | |
4549 | * variant | |
4550 | * @dev: device | |
4551 | * | |
4552 | * Gets the first netdev_adjacent->private from the dev's lower neighbour | |
4553 | * list. The caller must hold RCU read lock. | |
4554 | */ | |
4555 | void *netdev_lower_get_first_private_rcu(struct net_device *dev) | |
4556 | { | |
4557 | struct netdev_adjacent *lower; | |
4558 | ||
4559 | lower = list_first_or_null_rcu(&dev->adj_list.lower, | |
4560 | struct netdev_adjacent, list); | |
4561 | if (lower) | |
4562 | return lower->private; | |
4563 | return NULL; | |
4564 | } | |
4565 | EXPORT_SYMBOL(netdev_lower_get_first_private_rcu); | |
4566 | ||
9ff162a8 JP |
4567 | /** |
4568 | * netdev_master_upper_dev_get_rcu - Get master upper device | |
4569 | * @dev: device | |
4570 | * | |
4571 | * Find a master upper device and return pointer to it or NULL in case | |
4572 | * it's not there. The caller must hold the RCU read lock. | |
4573 | */ | |
4574 | struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev) | |
4575 | { | |
aa9d8560 | 4576 | struct netdev_adjacent *upper; |
9ff162a8 | 4577 | |
2f268f12 | 4578 | upper = list_first_or_null_rcu(&dev->adj_list.upper, |
aa9d8560 | 4579 | struct netdev_adjacent, list); |
9ff162a8 JP |
4580 | if (upper && likely(upper->master)) |
4581 | return upper->dev; | |
4582 | return NULL; | |
4583 | } | |
4584 | EXPORT_SYMBOL(netdev_master_upper_dev_get_rcu); | |
4585 | ||
5d261913 VF |
4586 | static int __netdev_adjacent_dev_insert(struct net_device *dev, |
4587 | struct net_device *adj_dev, | |
7863c054 | 4588 | struct list_head *dev_list, |
402dae96 | 4589 | void *private, bool master) |
5d261913 VF |
4590 | { |
4591 | struct netdev_adjacent *adj; | |
5831d66e | 4592 | char linkname[IFNAMSIZ+7]; |
842d67a7 | 4593 | int ret; |
5d261913 | 4594 | |
7863c054 | 4595 | adj = __netdev_find_adj(dev, adj_dev, dev_list); |
5d261913 VF |
4596 | |
4597 | if (adj) { | |
5d261913 VF |
4598 | adj->ref_nr++; |
4599 | return 0; | |
4600 | } | |
4601 | ||
4602 | adj = kmalloc(sizeof(*adj), GFP_KERNEL); | |
4603 | if (!adj) | |
4604 | return -ENOMEM; | |
4605 | ||
4606 | adj->dev = adj_dev; | |
4607 | adj->master = master; | |
5d261913 | 4608 | adj->ref_nr = 1; |
402dae96 | 4609 | adj->private = private; |
5d261913 | 4610 | dev_hold(adj_dev); |
2f268f12 VF |
4611 | |
4612 | pr_debug("dev_hold for %s, because of link added from %s to %s\n", | |
4613 | adj_dev->name, dev->name, adj_dev->name); | |
5d261913 | 4614 | |
5831d66e VF |
4615 | if (dev_list == &dev->adj_list.lower) { |
4616 | sprintf(linkname, "lower_%s", adj_dev->name); | |
4617 | ret = sysfs_create_link(&(dev->dev.kobj), | |
4618 | &(adj_dev->dev.kobj), linkname); | |
4619 | if (ret) | |
4620 | goto free_adj; | |
4621 | } else if (dev_list == &dev->adj_list.upper) { | |
4622 | sprintf(linkname, "upper_%s", adj_dev->name); | |
4623 | ret = sysfs_create_link(&(dev->dev.kobj), | |
4624 | &(adj_dev->dev.kobj), linkname); | |
4625 | if (ret) | |
4626 | goto free_adj; | |
4627 | } | |
4628 | ||
7863c054 | 4629 | /* Ensure that master link is always the first item in list. */ |
842d67a7 VF |
4630 | if (master) { |
4631 | ret = sysfs_create_link(&(dev->dev.kobj), | |
4632 | &(adj_dev->dev.kobj), "master"); | |
4633 | if (ret) | |
5831d66e | 4634 | goto remove_symlinks; |
842d67a7 | 4635 | |
7863c054 | 4636 | list_add_rcu(&adj->list, dev_list); |
842d67a7 | 4637 | } else { |
7863c054 | 4638 | list_add_tail_rcu(&adj->list, dev_list); |
842d67a7 | 4639 | } |
5d261913 VF |
4640 | |
4641 | return 0; | |
842d67a7 | 4642 | |
5831d66e VF |
4643 | remove_symlinks: |
4644 | if (dev_list == &dev->adj_list.lower) { | |
4645 | sprintf(linkname, "lower_%s", adj_dev->name); | |
4646 | sysfs_remove_link(&(dev->dev.kobj), linkname); | |
4647 | } else if (dev_list == &dev->adj_list.upper) { | |
4648 | sprintf(linkname, "upper_%s", adj_dev->name); | |
4649 | sysfs_remove_link(&(dev->dev.kobj), linkname); | |
4650 | } | |
4651 | ||
842d67a7 VF |
4652 | free_adj: |
4653 | kfree(adj); | |
974daef7 | 4654 | dev_put(adj_dev); |
842d67a7 VF |
4655 | |
4656 | return ret; | |
5d261913 VF |
4657 | } |
4658 | ||
5d261913 | 4659 | void __netdev_adjacent_dev_remove(struct net_device *dev, |
7863c054 VF |
4660 | struct net_device *adj_dev, |
4661 | struct list_head *dev_list) | |
5d261913 VF |
4662 | { |
4663 | struct netdev_adjacent *adj; | |
5831d66e | 4664 | char linkname[IFNAMSIZ+7]; |
5d261913 | 4665 | |
7863c054 | 4666 | adj = __netdev_find_adj(dev, adj_dev, dev_list); |
5d261913 | 4667 | |
2f268f12 VF |
4668 | if (!adj) { |
4669 | pr_err("tried to remove device %s from %s\n", | |
4670 | dev->name, adj_dev->name); | |
5d261913 | 4671 | BUG(); |
2f268f12 | 4672 | } |
5d261913 VF |
4673 | |
4674 | if (adj->ref_nr > 1) { | |
2f268f12 VF |
4675 | pr_debug("%s to %s ref_nr-- = %d\n", dev->name, adj_dev->name, |
4676 | adj->ref_nr-1); | |
5d261913 VF |
4677 | adj->ref_nr--; |
4678 | return; | |
4679 | } | |
4680 | ||
842d67a7 VF |
4681 | if (adj->master) |
4682 | sysfs_remove_link(&(dev->dev.kobj), "master"); | |
4683 | ||
5831d66e VF |
4684 | if (dev_list == &dev->adj_list.lower) { |
4685 | sprintf(linkname, "lower_%s", adj_dev->name); | |
4686 | sysfs_remove_link(&(dev->dev.kobj), linkname); | |
4687 | } else if (dev_list == &dev->adj_list.upper) { | |
4688 | sprintf(linkname, "upper_%s", adj_dev->name); | |
4689 | sysfs_remove_link(&(dev->dev.kobj), linkname); | |
4690 | } | |
4691 | ||
5d261913 | 4692 | list_del_rcu(&adj->list); |
2f268f12 VF |
4693 | pr_debug("dev_put for %s, because link removed from %s to %s\n", |
4694 | adj_dev->name, dev->name, adj_dev->name); | |
5d261913 VF |
4695 | dev_put(adj_dev); |
4696 | kfree_rcu(adj, rcu); | |
4697 | } | |
4698 | ||
2f268f12 VF |
4699 | int __netdev_adjacent_dev_link_lists(struct net_device *dev, |
4700 | struct net_device *upper_dev, | |
4701 | struct list_head *up_list, | |
4702 | struct list_head *down_list, | |
402dae96 | 4703 | void *private, bool master) |
5d261913 VF |
4704 | { |
4705 | int ret; | |
4706 | ||
402dae96 VF |
4707 | ret = __netdev_adjacent_dev_insert(dev, upper_dev, up_list, private, |
4708 | master); | |
5d261913 VF |
4709 | if (ret) |
4710 | return ret; | |
4711 | ||
402dae96 VF |
4712 | ret = __netdev_adjacent_dev_insert(upper_dev, dev, down_list, private, |
4713 | false); | |
5d261913 | 4714 | if (ret) { |
2f268f12 | 4715 | __netdev_adjacent_dev_remove(dev, upper_dev, up_list); |
5d261913 VF |
4716 | return ret; |
4717 | } | |
4718 | ||
4719 | return 0; | |
4720 | } | |
4721 | ||
2f268f12 VF |
4722 | int __netdev_adjacent_dev_link(struct net_device *dev, |
4723 | struct net_device *upper_dev) | |
5d261913 | 4724 | { |
2f268f12 VF |
4725 | return __netdev_adjacent_dev_link_lists(dev, upper_dev, |
4726 | &dev->all_adj_list.upper, | |
4727 | &upper_dev->all_adj_list.lower, | |
402dae96 | 4728 | NULL, false); |
5d261913 VF |
4729 | } |
4730 | ||
2f268f12 VF |
4731 | void __netdev_adjacent_dev_unlink_lists(struct net_device *dev, |
4732 | struct net_device *upper_dev, | |
4733 | struct list_head *up_list, | |
4734 | struct list_head *down_list) | |
5d261913 | 4735 | { |
2f268f12 VF |
4736 | __netdev_adjacent_dev_remove(dev, upper_dev, up_list); |
4737 | __netdev_adjacent_dev_remove(upper_dev, dev, down_list); | |
5d261913 VF |
4738 | } |
4739 | ||
4740 | void __netdev_adjacent_dev_unlink(struct net_device *dev, | |
4741 | struct net_device *upper_dev) | |
4742 | { | |
2f268f12 VF |
4743 | __netdev_adjacent_dev_unlink_lists(dev, upper_dev, |
4744 | &dev->all_adj_list.upper, | |
4745 | &upper_dev->all_adj_list.lower); | |
4746 | } | |
4747 | ||
4748 | int __netdev_adjacent_dev_link_neighbour(struct net_device *dev, | |
4749 | struct net_device *upper_dev, | |
402dae96 | 4750 | void *private, bool master) |
2f268f12 VF |
4751 | { |
4752 | int ret = __netdev_adjacent_dev_link(dev, upper_dev); | |
4753 | ||
4754 | if (ret) | |
4755 | return ret; | |
4756 | ||
4757 | ret = __netdev_adjacent_dev_link_lists(dev, upper_dev, | |
4758 | &dev->adj_list.upper, | |
4759 | &upper_dev->adj_list.lower, | |
402dae96 | 4760 | private, master); |
2f268f12 VF |
4761 | if (ret) { |
4762 | __netdev_adjacent_dev_unlink(dev, upper_dev); | |
4763 | return ret; | |
4764 | } | |
4765 | ||
4766 | return 0; | |
5d261913 VF |
4767 | } |
4768 | ||
2f268f12 VF |
4769 | void __netdev_adjacent_dev_unlink_neighbour(struct net_device *dev, |
4770 | struct net_device *upper_dev) | |
4771 | { | |
4772 | __netdev_adjacent_dev_unlink(dev, upper_dev); | |
4773 | __netdev_adjacent_dev_unlink_lists(dev, upper_dev, | |
4774 | &dev->adj_list.upper, | |
4775 | &upper_dev->adj_list.lower); | |
4776 | } | |
5d261913 | 4777 | |
9ff162a8 | 4778 | static int __netdev_upper_dev_link(struct net_device *dev, |
402dae96 VF |
4779 | struct net_device *upper_dev, bool master, |
4780 | void *private) | |
9ff162a8 | 4781 | { |
5d261913 VF |
4782 | struct netdev_adjacent *i, *j, *to_i, *to_j; |
4783 | int ret = 0; | |
9ff162a8 JP |
4784 | |
4785 | ASSERT_RTNL(); | |
4786 | ||
4787 | if (dev == upper_dev) | |
4788 | return -EBUSY; | |
4789 | ||
4790 | /* To prevent loops, check if dev is not upper device to upper_dev. */ | |
2f268f12 | 4791 | if (__netdev_find_adj(upper_dev, dev, &upper_dev->all_adj_list.upper)) |
9ff162a8 JP |
4792 | return -EBUSY; |
4793 | ||
2f268f12 | 4794 | if (__netdev_find_adj(dev, upper_dev, &dev->all_adj_list.upper)) |
9ff162a8 JP |
4795 | return -EEXIST; |
4796 | ||
4797 | if (master && netdev_master_upper_dev_get(dev)) | |
4798 | return -EBUSY; | |
4799 | ||
402dae96 VF |
4800 | ret = __netdev_adjacent_dev_link_neighbour(dev, upper_dev, private, |
4801 | master); | |
5d261913 VF |
4802 | if (ret) |
4803 | return ret; | |
9ff162a8 | 4804 | |
5d261913 | 4805 | /* Now that we linked these devs, make all the upper_dev's |
2f268f12 | 4806 | * all_adj_list.upper visible to every dev's all_adj_list.lower an |
5d261913 VF |
4807 | * versa, and don't forget the devices itself. All of these |
4808 | * links are non-neighbours. | |
4809 | */ | |
2f268f12 VF |
4810 | list_for_each_entry(i, &dev->all_adj_list.lower, list) { |
4811 | list_for_each_entry(j, &upper_dev->all_adj_list.upper, list) { | |
4812 | pr_debug("Interlinking %s with %s, non-neighbour\n", | |
4813 | i->dev->name, j->dev->name); | |
5d261913 VF |
4814 | ret = __netdev_adjacent_dev_link(i->dev, j->dev); |
4815 | if (ret) | |
4816 | goto rollback_mesh; | |
4817 | } | |
4818 | } | |
4819 | ||
4820 | /* add dev to every upper_dev's upper device */ | |
2f268f12 VF |
4821 | list_for_each_entry(i, &upper_dev->all_adj_list.upper, list) { |
4822 | pr_debug("linking %s's upper device %s with %s\n", | |
4823 | upper_dev->name, i->dev->name, dev->name); | |
5d261913 VF |
4824 | ret = __netdev_adjacent_dev_link(dev, i->dev); |
4825 | if (ret) | |
4826 | goto rollback_upper_mesh; | |
4827 | } | |
4828 | ||
4829 | /* add upper_dev to every dev's lower device */ | |
2f268f12 VF |
4830 | list_for_each_entry(i, &dev->all_adj_list.lower, list) { |
4831 | pr_debug("linking %s's lower device %s with %s\n", dev->name, | |
4832 | i->dev->name, upper_dev->name); | |
5d261913 VF |
4833 | ret = __netdev_adjacent_dev_link(i->dev, upper_dev); |
4834 | if (ret) | |
4835 | goto rollback_lower_mesh; | |
4836 | } | |
9ff162a8 | 4837 | |
42e52bf9 | 4838 | call_netdevice_notifiers(NETDEV_CHANGEUPPER, dev); |
9ff162a8 | 4839 | return 0; |
5d261913 VF |
4840 | |
4841 | rollback_lower_mesh: | |
4842 | to_i = i; | |
2f268f12 | 4843 | list_for_each_entry(i, &dev->all_adj_list.lower, list) { |
5d261913 VF |
4844 | if (i == to_i) |
4845 | break; | |
4846 | __netdev_adjacent_dev_unlink(i->dev, upper_dev); | |
4847 | } | |
4848 | ||
4849 | i = NULL; | |
4850 | ||
4851 | rollback_upper_mesh: | |
4852 | to_i = i; | |
2f268f12 | 4853 | list_for_each_entry(i, &upper_dev->all_adj_list.upper, list) { |
5d261913 VF |
4854 | if (i == to_i) |
4855 | break; | |
4856 | __netdev_adjacent_dev_unlink(dev, i->dev); | |
4857 | } | |
4858 | ||
4859 | i = j = NULL; | |
4860 | ||
4861 | rollback_mesh: | |
4862 | to_i = i; | |
4863 | to_j = j; | |
2f268f12 VF |
4864 | list_for_each_entry(i, &dev->all_adj_list.lower, list) { |
4865 | list_for_each_entry(j, &upper_dev->all_adj_list.upper, list) { | |
5d261913 VF |
4866 | if (i == to_i && j == to_j) |
4867 | break; | |
4868 | __netdev_adjacent_dev_unlink(i->dev, j->dev); | |
4869 | } | |
4870 | if (i == to_i) | |
4871 | break; | |
4872 | } | |
4873 | ||
2f268f12 | 4874 | __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev); |
5d261913 VF |
4875 | |
4876 | return ret; | |
9ff162a8 JP |
4877 | } |
4878 | ||
4879 | /** | |
4880 | * netdev_upper_dev_link - Add a link to the upper device | |
4881 | * @dev: device | |
4882 | * @upper_dev: new upper device | |
4883 | * | |
4884 | * Adds a link to device which is upper to this one. The caller must hold | |
4885 | * the RTNL lock. On a failure a negative errno code is returned. | |
4886 | * On success the reference counts are adjusted and the function | |
4887 | * returns zero. | |
4888 | */ | |
4889 | int netdev_upper_dev_link(struct net_device *dev, | |
4890 | struct net_device *upper_dev) | |
4891 | { | |
402dae96 | 4892 | return __netdev_upper_dev_link(dev, upper_dev, false, NULL); |
9ff162a8 JP |
4893 | } |
4894 | EXPORT_SYMBOL(netdev_upper_dev_link); | |
4895 | ||
4896 | /** | |
4897 | * netdev_master_upper_dev_link - Add a master link to the upper device | |
4898 | * @dev: device | |
4899 | * @upper_dev: new upper device | |
4900 | * | |
4901 | * Adds a link to device which is upper to this one. In this case, only | |
4902 | * one master upper device can be linked, although other non-master devices | |
4903 | * might be linked as well. The caller must hold the RTNL lock. | |
4904 | * On a failure a negative errno code is returned. On success the reference | |
4905 | * counts are adjusted and the function returns zero. | |
4906 | */ | |
4907 | int netdev_master_upper_dev_link(struct net_device *dev, | |
4908 | struct net_device *upper_dev) | |
4909 | { | |
402dae96 | 4910 | return __netdev_upper_dev_link(dev, upper_dev, true, NULL); |
9ff162a8 JP |
4911 | } |
4912 | EXPORT_SYMBOL(netdev_master_upper_dev_link); | |
4913 | ||
402dae96 VF |
4914 | int netdev_master_upper_dev_link_private(struct net_device *dev, |
4915 | struct net_device *upper_dev, | |
4916 | void *private) | |
4917 | { | |
4918 | return __netdev_upper_dev_link(dev, upper_dev, true, private); | |
4919 | } | |
4920 | EXPORT_SYMBOL(netdev_master_upper_dev_link_private); | |
4921 | ||
9ff162a8 JP |
4922 | /** |
4923 | * netdev_upper_dev_unlink - Removes a link to upper device | |
4924 | * @dev: device | |
4925 | * @upper_dev: new upper device | |
4926 | * | |
4927 | * Removes a link to device which is upper to this one. The caller must hold | |
4928 | * the RTNL lock. | |
4929 | */ | |
4930 | void netdev_upper_dev_unlink(struct net_device *dev, | |
4931 | struct net_device *upper_dev) | |
4932 | { | |
5d261913 | 4933 | struct netdev_adjacent *i, *j; |
9ff162a8 JP |
4934 | ASSERT_RTNL(); |
4935 | ||
2f268f12 | 4936 | __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev); |
5d261913 VF |
4937 | |
4938 | /* Here is the tricky part. We must remove all dev's lower | |
4939 | * devices from all upper_dev's upper devices and vice | |
4940 | * versa, to maintain the graph relationship. | |
4941 | */ | |
2f268f12 VF |
4942 | list_for_each_entry(i, &dev->all_adj_list.lower, list) |
4943 | list_for_each_entry(j, &upper_dev->all_adj_list.upper, list) | |
5d261913 VF |
4944 | __netdev_adjacent_dev_unlink(i->dev, j->dev); |
4945 | ||
4946 | /* remove also the devices itself from lower/upper device | |
4947 | * list | |
4948 | */ | |
2f268f12 | 4949 | list_for_each_entry(i, &dev->all_adj_list.lower, list) |
5d261913 VF |
4950 | __netdev_adjacent_dev_unlink(i->dev, upper_dev); |
4951 | ||
2f268f12 | 4952 | list_for_each_entry(i, &upper_dev->all_adj_list.upper, list) |
5d261913 VF |
4953 | __netdev_adjacent_dev_unlink(dev, i->dev); |
4954 | ||
42e52bf9 | 4955 | call_netdevice_notifiers(NETDEV_CHANGEUPPER, dev); |
9ff162a8 JP |
4956 | } |
4957 | EXPORT_SYMBOL(netdev_upper_dev_unlink); | |
4958 | ||
402dae96 VF |
4959 | void *netdev_lower_dev_get_private_rcu(struct net_device *dev, |
4960 | struct net_device *lower_dev) | |
4961 | { | |
4962 | struct netdev_adjacent *lower; | |
4963 | ||
4964 | if (!lower_dev) | |
4965 | return NULL; | |
4966 | lower = __netdev_find_adj_rcu(dev, lower_dev, &dev->adj_list.lower); | |
4967 | if (!lower) | |
4968 | return NULL; | |
4969 | ||
4970 | return lower->private; | |
4971 | } | |
4972 | EXPORT_SYMBOL(netdev_lower_dev_get_private_rcu); | |
4973 | ||
4974 | void *netdev_lower_dev_get_private(struct net_device *dev, | |
4975 | struct net_device *lower_dev) | |
4976 | { | |
4977 | struct netdev_adjacent *lower; | |
4978 | ||
4979 | if (!lower_dev) | |
4980 | return NULL; | |
4981 | lower = __netdev_find_adj(dev, lower_dev, &dev->adj_list.lower); | |
4982 | if (!lower) | |
4983 | return NULL; | |
4984 | ||
4985 | return lower->private; | |
4986 | } | |
4987 | EXPORT_SYMBOL(netdev_lower_dev_get_private); | |
4988 | ||
b6c40d68 PM |
4989 | static void dev_change_rx_flags(struct net_device *dev, int flags) |
4990 | { | |
d314774c SH |
4991 | const struct net_device_ops *ops = dev->netdev_ops; |
4992 | ||
d2615bf4 | 4993 | if (ops->ndo_change_rx_flags) |
d314774c | 4994 | ops->ndo_change_rx_flags(dev, flags); |
b6c40d68 PM |
4995 | } |
4996 | ||
991fb3f7 | 4997 | static int __dev_set_promiscuity(struct net_device *dev, int inc, bool notify) |
1da177e4 | 4998 | { |
b536db93 | 4999 | unsigned int old_flags = dev->flags; |
d04a48b0 EB |
5000 | kuid_t uid; |
5001 | kgid_t gid; | |
1da177e4 | 5002 | |
24023451 PM |
5003 | ASSERT_RTNL(); |
5004 | ||
dad9b335 WC |
5005 | dev->flags |= IFF_PROMISC; |
5006 | dev->promiscuity += inc; | |
5007 | if (dev->promiscuity == 0) { | |
5008 | /* | |
5009 | * Avoid overflow. | |
5010 | * If inc causes overflow, untouch promisc and return error. | |
5011 | */ | |
5012 | if (inc < 0) | |
5013 | dev->flags &= ~IFF_PROMISC; | |
5014 | else { | |
5015 | dev->promiscuity -= inc; | |
7b6cd1ce JP |
5016 | pr_warn("%s: promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n", |
5017 | dev->name); | |
dad9b335 WC |
5018 | return -EOVERFLOW; |
5019 | } | |
5020 | } | |
52609c0b | 5021 | if (dev->flags != old_flags) { |
7b6cd1ce JP |
5022 | pr_info("device %s %s promiscuous mode\n", |
5023 | dev->name, | |
5024 | dev->flags & IFF_PROMISC ? "entered" : "left"); | |
8192b0c4 DH |
5025 | if (audit_enabled) { |
5026 | current_uid_gid(&uid, &gid); | |
7759db82 KHK |
5027 | audit_log(current->audit_context, GFP_ATOMIC, |
5028 | AUDIT_ANOM_PROMISCUOUS, | |
5029 | "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u", | |
5030 | dev->name, (dev->flags & IFF_PROMISC), | |
5031 | (old_flags & IFF_PROMISC), | |
e1760bd5 | 5032 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
d04a48b0 EB |
5033 | from_kuid(&init_user_ns, uid), |
5034 | from_kgid(&init_user_ns, gid), | |
7759db82 | 5035 | audit_get_sessionid(current)); |
8192b0c4 | 5036 | } |
24023451 | 5037 | |
b6c40d68 | 5038 | dev_change_rx_flags(dev, IFF_PROMISC); |
1da177e4 | 5039 | } |
991fb3f7 ND |
5040 | if (notify) |
5041 | __dev_notify_flags(dev, old_flags, IFF_PROMISC); | |
dad9b335 | 5042 | return 0; |
1da177e4 LT |
5043 | } |
5044 | ||
4417da66 PM |
5045 | /** |
5046 | * dev_set_promiscuity - update promiscuity count on a device | |
5047 | * @dev: device | |
5048 | * @inc: modifier | |
5049 | * | |
5050 | * Add or remove promiscuity from a device. While the count in the device | |
5051 | * remains above zero the interface remains promiscuous. Once it hits zero | |
5052 | * the device reverts back to normal filtering operation. A negative inc | |
5053 | * value is used to drop promiscuity on the device. | |
dad9b335 | 5054 | * Return 0 if successful or a negative errno code on error. |
4417da66 | 5055 | */ |
dad9b335 | 5056 | int dev_set_promiscuity(struct net_device *dev, int inc) |
4417da66 | 5057 | { |
b536db93 | 5058 | unsigned int old_flags = dev->flags; |
dad9b335 | 5059 | int err; |
4417da66 | 5060 | |
991fb3f7 | 5061 | err = __dev_set_promiscuity(dev, inc, true); |
4b5a698e | 5062 | if (err < 0) |
dad9b335 | 5063 | return err; |
4417da66 PM |
5064 | if (dev->flags != old_flags) |
5065 | dev_set_rx_mode(dev); | |
dad9b335 | 5066 | return err; |
4417da66 | 5067 | } |
d1b19dff | 5068 | EXPORT_SYMBOL(dev_set_promiscuity); |
4417da66 | 5069 | |
991fb3f7 | 5070 | static int __dev_set_allmulti(struct net_device *dev, int inc, bool notify) |
1da177e4 | 5071 | { |
991fb3f7 | 5072 | unsigned int old_flags = dev->flags, old_gflags = dev->gflags; |
1da177e4 | 5073 | |
24023451 PM |
5074 | ASSERT_RTNL(); |
5075 | ||
1da177e4 | 5076 | dev->flags |= IFF_ALLMULTI; |
dad9b335 WC |
5077 | dev->allmulti += inc; |
5078 | if (dev->allmulti == 0) { | |
5079 | /* | |
5080 | * Avoid overflow. | |
5081 | * If inc causes overflow, untouch allmulti and return error. | |
5082 | */ | |
5083 | if (inc < 0) | |
5084 | dev->flags &= ~IFF_ALLMULTI; | |
5085 | else { | |
5086 | dev->allmulti -= inc; | |
7b6cd1ce JP |
5087 | pr_warn("%s: allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n", |
5088 | dev->name); | |
dad9b335 WC |
5089 | return -EOVERFLOW; |
5090 | } | |
5091 | } | |
24023451 | 5092 | if (dev->flags ^ old_flags) { |
b6c40d68 | 5093 | dev_change_rx_flags(dev, IFF_ALLMULTI); |
4417da66 | 5094 | dev_set_rx_mode(dev); |
991fb3f7 ND |
5095 | if (notify) |
5096 | __dev_notify_flags(dev, old_flags, | |
5097 | dev->gflags ^ old_gflags); | |
24023451 | 5098 | } |
dad9b335 | 5099 | return 0; |
4417da66 | 5100 | } |
991fb3f7 ND |
5101 | |
5102 | /** | |
5103 | * dev_set_allmulti - update allmulti count on a device | |
5104 | * @dev: device | |
5105 | * @inc: modifier | |
5106 | * | |
5107 | * Add or remove reception of all multicast frames to a device. While the | |
5108 | * count in the device remains above zero the interface remains listening | |
5109 | * to all interfaces. Once it hits zero the device reverts back to normal | |
5110 | * filtering operation. A negative @inc value is used to drop the counter | |
5111 | * when releasing a resource needing all multicasts. | |
5112 | * Return 0 if successful or a negative errno code on error. | |
5113 | */ | |
5114 | ||
5115 | int dev_set_allmulti(struct net_device *dev, int inc) | |
5116 | { | |
5117 | return __dev_set_allmulti(dev, inc, true); | |
5118 | } | |
d1b19dff | 5119 | EXPORT_SYMBOL(dev_set_allmulti); |
4417da66 PM |
5120 | |
5121 | /* | |
5122 | * Upload unicast and multicast address lists to device and | |
5123 | * configure RX filtering. When the device doesn't support unicast | |
53ccaae1 | 5124 | * filtering it is put in promiscuous mode while unicast addresses |
4417da66 PM |
5125 | * are present. |
5126 | */ | |
5127 | void __dev_set_rx_mode(struct net_device *dev) | |
5128 | { | |
d314774c SH |
5129 | const struct net_device_ops *ops = dev->netdev_ops; |
5130 | ||
4417da66 PM |
5131 | /* dev_open will call this function so the list will stay sane. */ |
5132 | if (!(dev->flags&IFF_UP)) | |
5133 | return; | |
5134 | ||
5135 | if (!netif_device_present(dev)) | |
40b77c94 | 5136 | return; |
4417da66 | 5137 | |
01789349 | 5138 | if (!(dev->priv_flags & IFF_UNICAST_FLT)) { |
4417da66 PM |
5139 | /* Unicast addresses changes may only happen under the rtnl, |
5140 | * therefore calling __dev_set_promiscuity here is safe. | |
5141 | */ | |
32e7bfc4 | 5142 | if (!netdev_uc_empty(dev) && !dev->uc_promisc) { |
991fb3f7 | 5143 | __dev_set_promiscuity(dev, 1, false); |
2d348d1f | 5144 | dev->uc_promisc = true; |
32e7bfc4 | 5145 | } else if (netdev_uc_empty(dev) && dev->uc_promisc) { |
991fb3f7 | 5146 | __dev_set_promiscuity(dev, -1, false); |
2d348d1f | 5147 | dev->uc_promisc = false; |
4417da66 | 5148 | } |
4417da66 | 5149 | } |
01789349 JP |
5150 | |
5151 | if (ops->ndo_set_rx_mode) | |
5152 | ops->ndo_set_rx_mode(dev); | |
4417da66 PM |
5153 | } |
5154 | ||
5155 | void dev_set_rx_mode(struct net_device *dev) | |
5156 | { | |
b9e40857 | 5157 | netif_addr_lock_bh(dev); |
4417da66 | 5158 | __dev_set_rx_mode(dev); |
b9e40857 | 5159 | netif_addr_unlock_bh(dev); |
1da177e4 LT |
5160 | } |
5161 | ||
f0db275a SH |
5162 | /** |
5163 | * dev_get_flags - get flags reported to userspace | |
5164 | * @dev: device | |
5165 | * | |
5166 | * Get the combination of flag bits exported through APIs to userspace. | |
5167 | */ | |
95c96174 | 5168 | unsigned int dev_get_flags(const struct net_device *dev) |
1da177e4 | 5169 | { |
95c96174 | 5170 | unsigned int flags; |
1da177e4 LT |
5171 | |
5172 | flags = (dev->flags & ~(IFF_PROMISC | | |
5173 | IFF_ALLMULTI | | |
b00055aa SR |
5174 | IFF_RUNNING | |
5175 | IFF_LOWER_UP | | |
5176 | IFF_DORMANT)) | | |
1da177e4 LT |
5177 | (dev->gflags & (IFF_PROMISC | |
5178 | IFF_ALLMULTI)); | |
5179 | ||
b00055aa SR |
5180 | if (netif_running(dev)) { |
5181 | if (netif_oper_up(dev)) | |
5182 | flags |= IFF_RUNNING; | |
5183 | if (netif_carrier_ok(dev)) | |
5184 | flags |= IFF_LOWER_UP; | |
5185 | if (netif_dormant(dev)) | |
5186 | flags |= IFF_DORMANT; | |
5187 | } | |
1da177e4 LT |
5188 | |
5189 | return flags; | |
5190 | } | |
d1b19dff | 5191 | EXPORT_SYMBOL(dev_get_flags); |
1da177e4 | 5192 | |
bd380811 | 5193 | int __dev_change_flags(struct net_device *dev, unsigned int flags) |
1da177e4 | 5194 | { |
b536db93 | 5195 | unsigned int old_flags = dev->flags; |
bd380811 | 5196 | int ret; |
1da177e4 | 5197 | |
24023451 PM |
5198 | ASSERT_RTNL(); |
5199 | ||
1da177e4 LT |
5200 | /* |
5201 | * Set the flags on our device. | |
5202 | */ | |
5203 | ||
5204 | dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP | | |
5205 | IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL | | |
5206 | IFF_AUTOMEDIA)) | | |
5207 | (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC | | |
5208 | IFF_ALLMULTI)); | |
5209 | ||
5210 | /* | |
5211 | * Load in the correct multicast list now the flags have changed. | |
5212 | */ | |
5213 | ||
b6c40d68 PM |
5214 | if ((old_flags ^ flags) & IFF_MULTICAST) |
5215 | dev_change_rx_flags(dev, IFF_MULTICAST); | |
24023451 | 5216 | |
4417da66 | 5217 | dev_set_rx_mode(dev); |
1da177e4 LT |
5218 | |
5219 | /* | |
5220 | * Have we downed the interface. We handle IFF_UP ourselves | |
5221 | * according to user attempts to set it, rather than blindly | |
5222 | * setting it. | |
5223 | */ | |
5224 | ||
5225 | ret = 0; | |
5226 | if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */ | |
bd380811 | 5227 | ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev); |
1da177e4 LT |
5228 | |
5229 | if (!ret) | |
4417da66 | 5230 | dev_set_rx_mode(dev); |
1da177e4 LT |
5231 | } |
5232 | ||
1da177e4 | 5233 | if ((flags ^ dev->gflags) & IFF_PROMISC) { |
d1b19dff | 5234 | int inc = (flags & IFF_PROMISC) ? 1 : -1; |
991fb3f7 | 5235 | unsigned int old_flags = dev->flags; |
d1b19dff | 5236 | |
1da177e4 | 5237 | dev->gflags ^= IFF_PROMISC; |
991fb3f7 ND |
5238 | |
5239 | if (__dev_set_promiscuity(dev, inc, false) >= 0) | |
5240 | if (dev->flags != old_flags) | |
5241 | dev_set_rx_mode(dev); | |
1da177e4 LT |
5242 | } |
5243 | ||
5244 | /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI | |
5245 | is important. Some (broken) drivers set IFF_PROMISC, when | |
5246 | IFF_ALLMULTI is requested not asking us and not reporting. | |
5247 | */ | |
5248 | if ((flags ^ dev->gflags) & IFF_ALLMULTI) { | |
d1b19dff ED |
5249 | int inc = (flags & IFF_ALLMULTI) ? 1 : -1; |
5250 | ||
1da177e4 | 5251 | dev->gflags ^= IFF_ALLMULTI; |
991fb3f7 | 5252 | __dev_set_allmulti(dev, inc, false); |
1da177e4 LT |
5253 | } |
5254 | ||
bd380811 PM |
5255 | return ret; |
5256 | } | |
5257 | ||
a528c219 ND |
5258 | void __dev_notify_flags(struct net_device *dev, unsigned int old_flags, |
5259 | unsigned int gchanges) | |
bd380811 PM |
5260 | { |
5261 | unsigned int changes = dev->flags ^ old_flags; | |
5262 | ||
a528c219 | 5263 | if (gchanges) |
7f294054 | 5264 | rtmsg_ifinfo(RTM_NEWLINK, dev, gchanges, GFP_ATOMIC); |
a528c219 | 5265 | |
bd380811 PM |
5266 | if (changes & IFF_UP) { |
5267 | if (dev->flags & IFF_UP) | |
5268 | call_netdevice_notifiers(NETDEV_UP, dev); | |
5269 | else | |
5270 | call_netdevice_notifiers(NETDEV_DOWN, dev); | |
5271 | } | |
5272 | ||
5273 | if (dev->flags & IFF_UP && | |
be9efd36 JP |
5274 | (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE))) { |
5275 | struct netdev_notifier_change_info change_info; | |
5276 | ||
5277 | change_info.flags_changed = changes; | |
5278 | call_netdevice_notifiers_info(NETDEV_CHANGE, dev, | |
5279 | &change_info.info); | |
5280 | } | |
bd380811 PM |
5281 | } |
5282 | ||
5283 | /** | |
5284 | * dev_change_flags - change device settings | |
5285 | * @dev: device | |
5286 | * @flags: device state flags | |
5287 | * | |
5288 | * Change settings on device based state flags. The flags are | |
5289 | * in the userspace exported format. | |
5290 | */ | |
b536db93 | 5291 | int dev_change_flags(struct net_device *dev, unsigned int flags) |
bd380811 | 5292 | { |
b536db93 | 5293 | int ret; |
991fb3f7 | 5294 | unsigned int changes, old_flags = dev->flags, old_gflags = dev->gflags; |
bd380811 PM |
5295 | |
5296 | ret = __dev_change_flags(dev, flags); | |
5297 | if (ret < 0) | |
5298 | return ret; | |
5299 | ||
991fb3f7 | 5300 | changes = (old_flags ^ dev->flags) | (old_gflags ^ dev->gflags); |
a528c219 | 5301 | __dev_notify_flags(dev, old_flags, changes); |
1da177e4 LT |
5302 | return ret; |
5303 | } | |
d1b19dff | 5304 | EXPORT_SYMBOL(dev_change_flags); |
1da177e4 | 5305 | |
f0db275a SH |
5306 | /** |
5307 | * dev_set_mtu - Change maximum transfer unit | |
5308 | * @dev: device | |
5309 | * @new_mtu: new transfer unit | |
5310 | * | |
5311 | * Change the maximum transfer size of the network device. | |
5312 | */ | |
1da177e4 LT |
5313 | int dev_set_mtu(struct net_device *dev, int new_mtu) |
5314 | { | |
d314774c | 5315 | const struct net_device_ops *ops = dev->netdev_ops; |
1da177e4 LT |
5316 | int err; |
5317 | ||
5318 | if (new_mtu == dev->mtu) | |
5319 | return 0; | |
5320 | ||
5321 | /* MTU must be positive. */ | |
5322 | if (new_mtu < 0) | |
5323 | return -EINVAL; | |
5324 | ||
5325 | if (!netif_device_present(dev)) | |
5326 | return -ENODEV; | |
5327 | ||
5328 | err = 0; | |
d314774c SH |
5329 | if (ops->ndo_change_mtu) |
5330 | err = ops->ndo_change_mtu(dev, new_mtu); | |
1da177e4 LT |
5331 | else |
5332 | dev->mtu = new_mtu; | |
d314774c | 5333 | |
e3d8fabe | 5334 | if (!err) |
056925ab | 5335 | call_netdevice_notifiers(NETDEV_CHANGEMTU, dev); |
1da177e4 LT |
5336 | return err; |
5337 | } | |
d1b19dff | 5338 | EXPORT_SYMBOL(dev_set_mtu); |
1da177e4 | 5339 | |
cbda10fa VD |
5340 | /** |
5341 | * dev_set_group - Change group this device belongs to | |
5342 | * @dev: device | |
5343 | * @new_group: group this device should belong to | |
5344 | */ | |
5345 | void dev_set_group(struct net_device *dev, int new_group) | |
5346 | { | |
5347 | dev->group = new_group; | |
5348 | } | |
5349 | EXPORT_SYMBOL(dev_set_group); | |
5350 | ||
f0db275a SH |
5351 | /** |
5352 | * dev_set_mac_address - Change Media Access Control Address | |
5353 | * @dev: device | |
5354 | * @sa: new address | |
5355 | * | |
5356 | * Change the hardware (MAC) address of the device | |
5357 | */ | |
1da177e4 LT |
5358 | int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa) |
5359 | { | |
d314774c | 5360 | const struct net_device_ops *ops = dev->netdev_ops; |
1da177e4 LT |
5361 | int err; |
5362 | ||
d314774c | 5363 | if (!ops->ndo_set_mac_address) |
1da177e4 LT |
5364 | return -EOPNOTSUPP; |
5365 | if (sa->sa_family != dev->type) | |
5366 | return -EINVAL; | |
5367 | if (!netif_device_present(dev)) | |
5368 | return -ENODEV; | |
d314774c | 5369 | err = ops->ndo_set_mac_address(dev, sa); |
f6521516 JP |
5370 | if (err) |
5371 | return err; | |
fbdeca2d | 5372 | dev->addr_assign_type = NET_ADDR_SET; |
f6521516 | 5373 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); |
7bf23575 | 5374 | add_device_randomness(dev->dev_addr, dev->addr_len); |
f6521516 | 5375 | return 0; |
1da177e4 | 5376 | } |
d1b19dff | 5377 | EXPORT_SYMBOL(dev_set_mac_address); |
1da177e4 | 5378 | |
4bf84c35 JP |
5379 | /** |
5380 | * dev_change_carrier - Change device carrier | |
5381 | * @dev: device | |
691b3b7e | 5382 | * @new_carrier: new value |
4bf84c35 JP |
5383 | * |
5384 | * Change device carrier | |
5385 | */ | |
5386 | int dev_change_carrier(struct net_device *dev, bool new_carrier) | |
5387 | { | |
5388 | const struct net_device_ops *ops = dev->netdev_ops; | |
5389 | ||
5390 | if (!ops->ndo_change_carrier) | |
5391 | return -EOPNOTSUPP; | |
5392 | if (!netif_device_present(dev)) | |
5393 | return -ENODEV; | |
5394 | return ops->ndo_change_carrier(dev, new_carrier); | |
5395 | } | |
5396 | EXPORT_SYMBOL(dev_change_carrier); | |
5397 | ||
66b52b0d JP |
5398 | /** |
5399 | * dev_get_phys_port_id - Get device physical port ID | |
5400 | * @dev: device | |
5401 | * @ppid: port ID | |
5402 | * | |
5403 | * Get device physical port ID | |
5404 | */ | |
5405 | int dev_get_phys_port_id(struct net_device *dev, | |
5406 | struct netdev_phys_port_id *ppid) | |
5407 | { | |
5408 | const struct net_device_ops *ops = dev->netdev_ops; | |
5409 | ||
5410 | if (!ops->ndo_get_phys_port_id) | |
5411 | return -EOPNOTSUPP; | |
5412 | return ops->ndo_get_phys_port_id(dev, ppid); | |
5413 | } | |
5414 | EXPORT_SYMBOL(dev_get_phys_port_id); | |
5415 | ||
1da177e4 LT |
5416 | /** |
5417 | * dev_new_index - allocate an ifindex | |
c4ea43c5 | 5418 | * @net: the applicable net namespace |
1da177e4 LT |
5419 | * |
5420 | * Returns a suitable unique value for a new device interface | |
5421 | * number. The caller must hold the rtnl semaphore or the | |
5422 | * dev_base_lock to be sure it remains unique. | |
5423 | */ | |
881d966b | 5424 | static int dev_new_index(struct net *net) |
1da177e4 | 5425 | { |
aa79e66e | 5426 | int ifindex = net->ifindex; |
1da177e4 LT |
5427 | for (;;) { |
5428 | if (++ifindex <= 0) | |
5429 | ifindex = 1; | |
881d966b | 5430 | if (!__dev_get_by_index(net, ifindex)) |
aa79e66e | 5431 | return net->ifindex = ifindex; |
1da177e4 LT |
5432 | } |
5433 | } | |
5434 | ||
1da177e4 | 5435 | /* Delayed registration/unregisteration */ |
3b5b34fd | 5436 | static LIST_HEAD(net_todo_list); |
50624c93 | 5437 | static DECLARE_WAIT_QUEUE_HEAD(netdev_unregistering_wq); |
1da177e4 | 5438 | |
6f05f629 | 5439 | static void net_set_todo(struct net_device *dev) |
1da177e4 | 5440 | { |
1da177e4 | 5441 | list_add_tail(&dev->todo_list, &net_todo_list); |
50624c93 | 5442 | dev_net(dev)->dev_unreg_count++; |
1da177e4 LT |
5443 | } |
5444 | ||
9b5e383c | 5445 | static void rollback_registered_many(struct list_head *head) |
93ee31f1 | 5446 | { |
e93737b0 | 5447 | struct net_device *dev, *tmp; |
5cde2829 | 5448 | LIST_HEAD(close_head); |
9b5e383c | 5449 | |
93ee31f1 DL |
5450 | BUG_ON(dev_boot_phase); |
5451 | ASSERT_RTNL(); | |
5452 | ||
e93737b0 | 5453 | list_for_each_entry_safe(dev, tmp, head, unreg_list) { |
9b5e383c | 5454 | /* Some devices call without registering |
e93737b0 KK |
5455 | * for initialization unwind. Remove those |
5456 | * devices and proceed with the remaining. | |
9b5e383c ED |
5457 | */ |
5458 | if (dev->reg_state == NETREG_UNINITIALIZED) { | |
7b6cd1ce JP |
5459 | pr_debug("unregister_netdevice: device %s/%p never was registered\n", |
5460 | dev->name, dev); | |
93ee31f1 | 5461 | |
9b5e383c | 5462 | WARN_ON(1); |
e93737b0 KK |
5463 | list_del(&dev->unreg_list); |
5464 | continue; | |
9b5e383c | 5465 | } |
449f4544 | 5466 | dev->dismantle = true; |
9b5e383c | 5467 | BUG_ON(dev->reg_state != NETREG_REGISTERED); |
44345724 | 5468 | } |
93ee31f1 | 5469 | |
44345724 | 5470 | /* If device is running, close it first. */ |
5cde2829 EB |
5471 | list_for_each_entry(dev, head, unreg_list) |
5472 | list_add_tail(&dev->close_list, &close_head); | |
5473 | dev_close_many(&close_head); | |
93ee31f1 | 5474 | |
44345724 | 5475 | list_for_each_entry(dev, head, unreg_list) { |
9b5e383c ED |
5476 | /* And unlink it from device chain. */ |
5477 | unlist_netdevice(dev); | |
93ee31f1 | 5478 | |
9b5e383c ED |
5479 | dev->reg_state = NETREG_UNREGISTERING; |
5480 | } | |
93ee31f1 DL |
5481 | |
5482 | synchronize_net(); | |
5483 | ||
9b5e383c ED |
5484 | list_for_each_entry(dev, head, unreg_list) { |
5485 | /* Shutdown queueing discipline. */ | |
5486 | dev_shutdown(dev); | |
93ee31f1 DL |
5487 | |
5488 | ||
9b5e383c ED |
5489 | /* Notify protocols, that we are about to destroy |
5490 | this device. They should clean all the things. | |
5491 | */ | |
5492 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); | |
93ee31f1 | 5493 | |
a2835763 PM |
5494 | if (!dev->rtnl_link_ops || |
5495 | dev->rtnl_link_state == RTNL_LINK_INITIALIZED) | |
7f294054 | 5496 | rtmsg_ifinfo(RTM_DELLINK, dev, ~0U, GFP_KERNEL); |
a2835763 | 5497 | |
9b5e383c ED |
5498 | /* |
5499 | * Flush the unicast and multicast chains | |
5500 | */ | |
a748ee24 | 5501 | dev_uc_flush(dev); |
22bedad3 | 5502 | dev_mc_flush(dev); |
93ee31f1 | 5503 | |
9b5e383c ED |
5504 | if (dev->netdev_ops->ndo_uninit) |
5505 | dev->netdev_ops->ndo_uninit(dev); | |
93ee31f1 | 5506 | |
9ff162a8 JP |
5507 | /* Notifier chain MUST detach us all upper devices. */ |
5508 | WARN_ON(netdev_has_any_upper_dev(dev)); | |
93ee31f1 | 5509 | |
9b5e383c ED |
5510 | /* Remove entries from kobject tree */ |
5511 | netdev_unregister_kobject(dev); | |
024e9679 AD |
5512 | #ifdef CONFIG_XPS |
5513 | /* Remove XPS queueing entries */ | |
5514 | netif_reset_xps_queues_gt(dev, 0); | |
5515 | #endif | |
9b5e383c | 5516 | } |
93ee31f1 | 5517 | |
850a545b | 5518 | synchronize_net(); |
395264d5 | 5519 | |
a5ee1551 | 5520 | list_for_each_entry(dev, head, unreg_list) |
9b5e383c ED |
5521 | dev_put(dev); |
5522 | } | |
5523 | ||
5524 | static void rollback_registered(struct net_device *dev) | |
5525 | { | |
5526 | LIST_HEAD(single); | |
5527 | ||
5528 | list_add(&dev->unreg_list, &single); | |
5529 | rollback_registered_many(&single); | |
ceaaec98 | 5530 | list_del(&single); |
93ee31f1 DL |
5531 | } |
5532 | ||
c8f44aff MM |
5533 | static netdev_features_t netdev_fix_features(struct net_device *dev, |
5534 | netdev_features_t features) | |
b63365a2 | 5535 | { |
57422dc5 MM |
5536 | /* Fix illegal checksum combinations */ |
5537 | if ((features & NETIF_F_HW_CSUM) && | |
5538 | (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) { | |
6f404e44 | 5539 | netdev_warn(dev, "mixed HW and IP checksum settings.\n"); |
57422dc5 MM |
5540 | features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM); |
5541 | } | |
5542 | ||
b63365a2 | 5543 | /* TSO requires that SG is present as well. */ |
ea2d3688 | 5544 | if ((features & NETIF_F_ALL_TSO) && !(features & NETIF_F_SG)) { |
6f404e44 | 5545 | netdev_dbg(dev, "Dropping TSO features since no SG feature.\n"); |
ea2d3688 | 5546 | features &= ~NETIF_F_ALL_TSO; |
b63365a2 HX |
5547 | } |
5548 | ||
ec5f0615 PS |
5549 | if ((features & NETIF_F_TSO) && !(features & NETIF_F_HW_CSUM) && |
5550 | !(features & NETIF_F_IP_CSUM)) { | |
5551 | netdev_dbg(dev, "Dropping TSO features since no CSUM feature.\n"); | |
5552 | features &= ~NETIF_F_TSO; | |
5553 | features &= ~NETIF_F_TSO_ECN; | |
5554 | } | |
5555 | ||
5556 | if ((features & NETIF_F_TSO6) && !(features & NETIF_F_HW_CSUM) && | |
5557 | !(features & NETIF_F_IPV6_CSUM)) { | |
5558 | netdev_dbg(dev, "Dropping TSO6 features since no CSUM feature.\n"); | |
5559 | features &= ~NETIF_F_TSO6; | |
5560 | } | |
5561 | ||
31d8b9e0 BH |
5562 | /* TSO ECN requires that TSO is present as well. */ |
5563 | if ((features & NETIF_F_ALL_TSO) == NETIF_F_TSO_ECN) | |
5564 | features &= ~NETIF_F_TSO_ECN; | |
5565 | ||
212b573f MM |
5566 | /* Software GSO depends on SG. */ |
5567 | if ((features & NETIF_F_GSO) && !(features & NETIF_F_SG)) { | |
6f404e44 | 5568 | netdev_dbg(dev, "Dropping NETIF_F_GSO since no SG feature.\n"); |
212b573f MM |
5569 | features &= ~NETIF_F_GSO; |
5570 | } | |
5571 | ||
acd1130e | 5572 | /* UFO needs SG and checksumming */ |
b63365a2 | 5573 | if (features & NETIF_F_UFO) { |
79032644 MM |
5574 | /* maybe split UFO into V4 and V6? */ |
5575 | if (!((features & NETIF_F_GEN_CSUM) || | |
5576 | (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM)) | |
5577 | == (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) { | |
6f404e44 | 5578 | netdev_dbg(dev, |
acd1130e | 5579 | "Dropping NETIF_F_UFO since no checksum offload features.\n"); |
b63365a2 HX |
5580 | features &= ~NETIF_F_UFO; |
5581 | } | |
5582 | ||
5583 | if (!(features & NETIF_F_SG)) { | |
6f404e44 | 5584 | netdev_dbg(dev, |
acd1130e | 5585 | "Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n"); |
b63365a2 HX |
5586 | features &= ~NETIF_F_UFO; |
5587 | } | |
5588 | } | |
5589 | ||
5590 | return features; | |
5591 | } | |
b63365a2 | 5592 | |
6cb6a27c | 5593 | int __netdev_update_features(struct net_device *dev) |
5455c699 | 5594 | { |
c8f44aff | 5595 | netdev_features_t features; |
5455c699 MM |
5596 | int err = 0; |
5597 | ||
87267485 MM |
5598 | ASSERT_RTNL(); |
5599 | ||
5455c699 MM |
5600 | features = netdev_get_wanted_features(dev); |
5601 | ||
5602 | if (dev->netdev_ops->ndo_fix_features) | |
5603 | features = dev->netdev_ops->ndo_fix_features(dev, features); | |
5604 | ||
5605 | /* driver might be less strict about feature dependencies */ | |
5606 | features = netdev_fix_features(dev, features); | |
5607 | ||
5608 | if (dev->features == features) | |
6cb6a27c | 5609 | return 0; |
5455c699 | 5610 | |
c8f44aff MM |
5611 | netdev_dbg(dev, "Features changed: %pNF -> %pNF\n", |
5612 | &dev->features, &features); | |
5455c699 MM |
5613 | |
5614 | if (dev->netdev_ops->ndo_set_features) | |
5615 | err = dev->netdev_ops->ndo_set_features(dev, features); | |
5616 | ||
6cb6a27c | 5617 | if (unlikely(err < 0)) { |
5455c699 | 5618 | netdev_err(dev, |
c8f44aff MM |
5619 | "set_features() failed (%d); wanted %pNF, left %pNF\n", |
5620 | err, &features, &dev->features); | |
6cb6a27c MM |
5621 | return -1; |
5622 | } | |
5623 | ||
5624 | if (!err) | |
5625 | dev->features = features; | |
5626 | ||
5627 | return 1; | |
5628 | } | |
5629 | ||
afe12cc8 MM |
5630 | /** |
5631 | * netdev_update_features - recalculate device features | |
5632 | * @dev: the device to check | |
5633 | * | |
5634 | * Recalculate dev->features set and send notifications if it | |
5635 | * has changed. Should be called after driver or hardware dependent | |
5636 | * conditions might have changed that influence the features. | |
5637 | */ | |
6cb6a27c MM |
5638 | void netdev_update_features(struct net_device *dev) |
5639 | { | |
5640 | if (__netdev_update_features(dev)) | |
5641 | netdev_features_change(dev); | |
5455c699 MM |
5642 | } |
5643 | EXPORT_SYMBOL(netdev_update_features); | |
5644 | ||
afe12cc8 MM |
5645 | /** |
5646 | * netdev_change_features - recalculate device features | |
5647 | * @dev: the device to check | |
5648 | * | |
5649 | * Recalculate dev->features set and send notifications even | |
5650 | * if they have not changed. Should be called instead of | |
5651 | * netdev_update_features() if also dev->vlan_features might | |
5652 | * have changed to allow the changes to be propagated to stacked | |
5653 | * VLAN devices. | |
5654 | */ | |
5655 | void netdev_change_features(struct net_device *dev) | |
5656 | { | |
5657 | __netdev_update_features(dev); | |
5658 | netdev_features_change(dev); | |
5659 | } | |
5660 | EXPORT_SYMBOL(netdev_change_features); | |
5661 | ||
fc4a7489 PM |
5662 | /** |
5663 | * netif_stacked_transfer_operstate - transfer operstate | |
5664 | * @rootdev: the root or lower level device to transfer state from | |
5665 | * @dev: the device to transfer operstate to | |
5666 | * | |
5667 | * Transfer operational state from root to device. This is normally | |
5668 | * called when a stacking relationship exists between the root | |
5669 | * device and the device(a leaf device). | |
5670 | */ | |
5671 | void netif_stacked_transfer_operstate(const struct net_device *rootdev, | |
5672 | struct net_device *dev) | |
5673 | { | |
5674 | if (rootdev->operstate == IF_OPER_DORMANT) | |
5675 | netif_dormant_on(dev); | |
5676 | else | |
5677 | netif_dormant_off(dev); | |
5678 | ||
5679 | if (netif_carrier_ok(rootdev)) { | |
5680 | if (!netif_carrier_ok(dev)) | |
5681 | netif_carrier_on(dev); | |
5682 | } else { | |
5683 | if (netif_carrier_ok(dev)) | |
5684 | netif_carrier_off(dev); | |
5685 | } | |
5686 | } | |
5687 | EXPORT_SYMBOL(netif_stacked_transfer_operstate); | |
5688 | ||
bf264145 | 5689 | #ifdef CONFIG_RPS |
1b4bf461 ED |
5690 | static int netif_alloc_rx_queues(struct net_device *dev) |
5691 | { | |
1b4bf461 | 5692 | unsigned int i, count = dev->num_rx_queues; |
bd25fa7b | 5693 | struct netdev_rx_queue *rx; |
1b4bf461 | 5694 | |
bd25fa7b | 5695 | BUG_ON(count < 1); |
1b4bf461 | 5696 | |
bd25fa7b | 5697 | rx = kcalloc(count, sizeof(struct netdev_rx_queue), GFP_KERNEL); |
62b5942a | 5698 | if (!rx) |
bd25fa7b | 5699 | return -ENOMEM; |
62b5942a | 5700 | |
bd25fa7b TH |
5701 | dev->_rx = rx; |
5702 | ||
bd25fa7b | 5703 | for (i = 0; i < count; i++) |
fe822240 | 5704 | rx[i].dev = dev; |
1b4bf461 ED |
5705 | return 0; |
5706 | } | |
bf264145 | 5707 | #endif |
1b4bf461 | 5708 | |
aa942104 CG |
5709 | static void netdev_init_one_queue(struct net_device *dev, |
5710 | struct netdev_queue *queue, void *_unused) | |
5711 | { | |
5712 | /* Initialize queue lock */ | |
5713 | spin_lock_init(&queue->_xmit_lock); | |
5714 | netdev_set_xmit_lockdep_class(&queue->_xmit_lock, dev->type); | |
5715 | queue->xmit_lock_owner = -1; | |
b236da69 | 5716 | netdev_queue_numa_node_write(queue, NUMA_NO_NODE); |
aa942104 | 5717 | queue->dev = dev; |
114cf580 TH |
5718 | #ifdef CONFIG_BQL |
5719 | dql_init(&queue->dql, HZ); | |
5720 | #endif | |
aa942104 CG |
5721 | } |
5722 | ||
60877a32 ED |
5723 | static void netif_free_tx_queues(struct net_device *dev) |
5724 | { | |
5725 | if (is_vmalloc_addr(dev->_tx)) | |
5726 | vfree(dev->_tx); | |
5727 | else | |
5728 | kfree(dev->_tx); | |
5729 | } | |
5730 | ||
e6484930 TH |
5731 | static int netif_alloc_netdev_queues(struct net_device *dev) |
5732 | { | |
5733 | unsigned int count = dev->num_tx_queues; | |
5734 | struct netdev_queue *tx; | |
60877a32 | 5735 | size_t sz = count * sizeof(*tx); |
e6484930 | 5736 | |
60877a32 | 5737 | BUG_ON(count < 1 || count > 0xffff); |
62b5942a | 5738 | |
60877a32 ED |
5739 | tx = kzalloc(sz, GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT); |
5740 | if (!tx) { | |
5741 | tx = vzalloc(sz); | |
5742 | if (!tx) | |
5743 | return -ENOMEM; | |
5744 | } | |
e6484930 | 5745 | dev->_tx = tx; |
1d24eb48 | 5746 | |
e6484930 TH |
5747 | netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL); |
5748 | spin_lock_init(&dev->tx_global_lock); | |
aa942104 CG |
5749 | |
5750 | return 0; | |
e6484930 TH |
5751 | } |
5752 | ||
1da177e4 LT |
5753 | /** |
5754 | * register_netdevice - register a network device | |
5755 | * @dev: device to register | |
5756 | * | |
5757 | * Take a completed network device structure and add it to the kernel | |
5758 | * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier | |
5759 | * chain. 0 is returned on success. A negative errno code is returned | |
5760 | * on a failure to set up the device, or if the name is a duplicate. | |
5761 | * | |
5762 | * Callers must hold the rtnl semaphore. You may want | |
5763 | * register_netdev() instead of this. | |
5764 | * | |
5765 | * BUGS: | |
5766 | * The locking appears insufficient to guarantee two parallel registers | |
5767 | * will not get the same name. | |
5768 | */ | |
5769 | ||
5770 | int register_netdevice(struct net_device *dev) | |
5771 | { | |
1da177e4 | 5772 | int ret; |
d314774c | 5773 | struct net *net = dev_net(dev); |
1da177e4 LT |
5774 | |
5775 | BUG_ON(dev_boot_phase); | |
5776 | ASSERT_RTNL(); | |
5777 | ||
b17a7c17 SH |
5778 | might_sleep(); |
5779 | ||
1da177e4 LT |
5780 | /* When net_device's are persistent, this will be fatal. */ |
5781 | BUG_ON(dev->reg_state != NETREG_UNINITIALIZED); | |
d314774c | 5782 | BUG_ON(!net); |
1da177e4 | 5783 | |
f1f28aa3 | 5784 | spin_lock_init(&dev->addr_list_lock); |
cf508b12 | 5785 | netdev_set_addr_lockdep_class(dev); |
1da177e4 | 5786 | |
1da177e4 LT |
5787 | dev->iflink = -1; |
5788 | ||
828de4f6 | 5789 | ret = dev_get_valid_name(net, dev, dev->name); |
0696c3a8 PP |
5790 | if (ret < 0) |
5791 | goto out; | |
5792 | ||
1da177e4 | 5793 | /* Init, if this function is available */ |
d314774c SH |
5794 | if (dev->netdev_ops->ndo_init) { |
5795 | ret = dev->netdev_ops->ndo_init(dev); | |
1da177e4 LT |
5796 | if (ret) { |
5797 | if (ret > 0) | |
5798 | ret = -EIO; | |
90833aa4 | 5799 | goto out; |
1da177e4 LT |
5800 | } |
5801 | } | |
4ec93edb | 5802 | |
f646968f PM |
5803 | if (((dev->hw_features | dev->features) & |
5804 | NETIF_F_HW_VLAN_CTAG_FILTER) && | |
d2ed273d MM |
5805 | (!dev->netdev_ops->ndo_vlan_rx_add_vid || |
5806 | !dev->netdev_ops->ndo_vlan_rx_kill_vid)) { | |
5807 | netdev_WARN(dev, "Buggy VLAN acceleration in driver!\n"); | |
5808 | ret = -EINVAL; | |
5809 | goto err_uninit; | |
5810 | } | |
5811 | ||
9c7dafbf PE |
5812 | ret = -EBUSY; |
5813 | if (!dev->ifindex) | |
5814 | dev->ifindex = dev_new_index(net); | |
5815 | else if (__dev_get_by_index(net, dev->ifindex)) | |
5816 | goto err_uninit; | |
5817 | ||
1da177e4 LT |
5818 | if (dev->iflink == -1) |
5819 | dev->iflink = dev->ifindex; | |
5820 | ||
5455c699 MM |
5821 | /* Transfer changeable features to wanted_features and enable |
5822 | * software offloads (GSO and GRO). | |
5823 | */ | |
5824 | dev->hw_features |= NETIF_F_SOFT_FEATURES; | |
14d1232f MM |
5825 | dev->features |= NETIF_F_SOFT_FEATURES; |
5826 | dev->wanted_features = dev->features & dev->hw_features; | |
1da177e4 | 5827 | |
c6e1a0d1 | 5828 | /* Turn on no cache copy if HW is doing checksum */ |
34324dc2 MM |
5829 | if (!(dev->flags & IFF_LOOPBACK)) { |
5830 | dev->hw_features |= NETIF_F_NOCACHE_COPY; | |
5831 | if (dev->features & NETIF_F_ALL_CSUM) { | |
5832 | dev->wanted_features |= NETIF_F_NOCACHE_COPY; | |
5833 | dev->features |= NETIF_F_NOCACHE_COPY; | |
5834 | } | |
c6e1a0d1 TH |
5835 | } |
5836 | ||
1180e7d6 | 5837 | /* Make NETIF_F_HIGHDMA inheritable to VLAN devices. |
16c3ea78 | 5838 | */ |
1180e7d6 | 5839 | dev->vlan_features |= NETIF_F_HIGHDMA; |
16c3ea78 | 5840 | |
ee579677 PS |
5841 | /* Make NETIF_F_SG inheritable to tunnel devices. |
5842 | */ | |
5843 | dev->hw_enc_features |= NETIF_F_SG; | |
5844 | ||
0d89d203 SH |
5845 | /* Make NETIF_F_SG inheritable to MPLS. |
5846 | */ | |
5847 | dev->mpls_features |= NETIF_F_SG; | |
5848 | ||
7ffbe3fd JB |
5849 | ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev); |
5850 | ret = notifier_to_errno(ret); | |
5851 | if (ret) | |
5852 | goto err_uninit; | |
5853 | ||
8b41d188 | 5854 | ret = netdev_register_kobject(dev); |
b17a7c17 | 5855 | if (ret) |
7ce1b0ed | 5856 | goto err_uninit; |
b17a7c17 SH |
5857 | dev->reg_state = NETREG_REGISTERED; |
5858 | ||
6cb6a27c | 5859 | __netdev_update_features(dev); |
8e9b59b2 | 5860 | |
1da177e4 LT |
5861 | /* |
5862 | * Default initial state at registry is that the | |
5863 | * device is present. | |
5864 | */ | |
5865 | ||
5866 | set_bit(__LINK_STATE_PRESENT, &dev->state); | |
5867 | ||
8f4cccbb BH |
5868 | linkwatch_init_dev(dev); |
5869 | ||
1da177e4 | 5870 | dev_init_scheduler(dev); |
1da177e4 | 5871 | dev_hold(dev); |
ce286d32 | 5872 | list_netdevice(dev); |
7bf23575 | 5873 | add_device_randomness(dev->dev_addr, dev->addr_len); |
1da177e4 | 5874 | |
948b337e JP |
5875 | /* If the device has permanent device address, driver should |
5876 | * set dev_addr and also addr_assign_type should be set to | |
5877 | * NET_ADDR_PERM (default value). | |
5878 | */ | |
5879 | if (dev->addr_assign_type == NET_ADDR_PERM) | |
5880 | memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len); | |
5881 | ||
1da177e4 | 5882 | /* Notify protocols, that a new device appeared. */ |
056925ab | 5883 | ret = call_netdevice_notifiers(NETDEV_REGISTER, dev); |
fcc5a03a | 5884 | ret = notifier_to_errno(ret); |
93ee31f1 DL |
5885 | if (ret) { |
5886 | rollback_registered(dev); | |
5887 | dev->reg_state = NETREG_UNREGISTERED; | |
5888 | } | |
d90a909e EB |
5889 | /* |
5890 | * Prevent userspace races by waiting until the network | |
5891 | * device is fully setup before sending notifications. | |
5892 | */ | |
a2835763 PM |
5893 | if (!dev->rtnl_link_ops || |
5894 | dev->rtnl_link_state == RTNL_LINK_INITIALIZED) | |
7f294054 | 5895 | rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL); |
1da177e4 LT |
5896 | |
5897 | out: | |
5898 | return ret; | |
7ce1b0ed HX |
5899 | |
5900 | err_uninit: | |
d314774c SH |
5901 | if (dev->netdev_ops->ndo_uninit) |
5902 | dev->netdev_ops->ndo_uninit(dev); | |
7ce1b0ed | 5903 | goto out; |
1da177e4 | 5904 | } |
d1b19dff | 5905 | EXPORT_SYMBOL(register_netdevice); |
1da177e4 | 5906 | |
937f1ba5 BH |
5907 | /** |
5908 | * init_dummy_netdev - init a dummy network device for NAPI | |
5909 | * @dev: device to init | |
5910 | * | |
5911 | * This takes a network device structure and initialize the minimum | |
5912 | * amount of fields so it can be used to schedule NAPI polls without | |
5913 | * registering a full blown interface. This is to be used by drivers | |
5914 | * that need to tie several hardware interfaces to a single NAPI | |
5915 | * poll scheduler due to HW limitations. | |
5916 | */ | |
5917 | int init_dummy_netdev(struct net_device *dev) | |
5918 | { | |
5919 | /* Clear everything. Note we don't initialize spinlocks | |
5920 | * are they aren't supposed to be taken by any of the | |
5921 | * NAPI code and this dummy netdev is supposed to be | |
5922 | * only ever used for NAPI polls | |
5923 | */ | |
5924 | memset(dev, 0, sizeof(struct net_device)); | |
5925 | ||
5926 | /* make sure we BUG if trying to hit standard | |
5927 | * register/unregister code path | |
5928 | */ | |
5929 | dev->reg_state = NETREG_DUMMY; | |
5930 | ||
937f1ba5 BH |
5931 | /* NAPI wants this */ |
5932 | INIT_LIST_HEAD(&dev->napi_list); | |
5933 | ||
5934 | /* a dummy interface is started by default */ | |
5935 | set_bit(__LINK_STATE_PRESENT, &dev->state); | |
5936 | set_bit(__LINK_STATE_START, &dev->state); | |
5937 | ||
29b4433d ED |
5938 | /* Note : We dont allocate pcpu_refcnt for dummy devices, |
5939 | * because users of this 'device' dont need to change | |
5940 | * its refcount. | |
5941 | */ | |
5942 | ||
937f1ba5 BH |
5943 | return 0; |
5944 | } | |
5945 | EXPORT_SYMBOL_GPL(init_dummy_netdev); | |
5946 | ||
5947 | ||
1da177e4 LT |
5948 | /** |
5949 | * register_netdev - register a network device | |
5950 | * @dev: device to register | |
5951 | * | |
5952 | * Take a completed network device structure and add it to the kernel | |
5953 | * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier | |
5954 | * chain. 0 is returned on success. A negative errno code is returned | |
5955 | * on a failure to set up the device, or if the name is a duplicate. | |
5956 | * | |
38b4da38 | 5957 | * This is a wrapper around register_netdevice that takes the rtnl semaphore |
1da177e4 LT |
5958 | * and expands the device name if you passed a format string to |
5959 | * alloc_netdev. | |
5960 | */ | |
5961 | int register_netdev(struct net_device *dev) | |
5962 | { | |
5963 | int err; | |
5964 | ||
5965 | rtnl_lock(); | |
1da177e4 | 5966 | err = register_netdevice(dev); |
1da177e4 LT |
5967 | rtnl_unlock(); |
5968 | return err; | |
5969 | } | |
5970 | EXPORT_SYMBOL(register_netdev); | |
5971 | ||
29b4433d ED |
5972 | int netdev_refcnt_read(const struct net_device *dev) |
5973 | { | |
5974 | int i, refcnt = 0; | |
5975 | ||
5976 | for_each_possible_cpu(i) | |
5977 | refcnt += *per_cpu_ptr(dev->pcpu_refcnt, i); | |
5978 | return refcnt; | |
5979 | } | |
5980 | EXPORT_SYMBOL(netdev_refcnt_read); | |
5981 | ||
2c53040f | 5982 | /** |
1da177e4 | 5983 | * netdev_wait_allrefs - wait until all references are gone. |
3de7a37b | 5984 | * @dev: target net_device |
1da177e4 LT |
5985 | * |
5986 | * This is called when unregistering network devices. | |
5987 | * | |
5988 | * Any protocol or device that holds a reference should register | |
5989 | * for netdevice notification, and cleanup and put back the | |
5990 | * reference if they receive an UNREGISTER event. | |
5991 | * We can get stuck here if buggy protocols don't correctly | |
4ec93edb | 5992 | * call dev_put. |
1da177e4 LT |
5993 | */ |
5994 | static void netdev_wait_allrefs(struct net_device *dev) | |
5995 | { | |
5996 | unsigned long rebroadcast_time, warning_time; | |
29b4433d | 5997 | int refcnt; |
1da177e4 | 5998 | |
e014debe ED |
5999 | linkwatch_forget_dev(dev); |
6000 | ||
1da177e4 | 6001 | rebroadcast_time = warning_time = jiffies; |
29b4433d ED |
6002 | refcnt = netdev_refcnt_read(dev); |
6003 | ||
6004 | while (refcnt != 0) { | |
1da177e4 | 6005 | if (time_after(jiffies, rebroadcast_time + 1 * HZ)) { |
6756ae4b | 6006 | rtnl_lock(); |
1da177e4 LT |
6007 | |
6008 | /* Rebroadcast unregister notification */ | |
056925ab | 6009 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); |
1da177e4 | 6010 | |
748e2d93 | 6011 | __rtnl_unlock(); |
0115e8e3 | 6012 | rcu_barrier(); |
748e2d93 ED |
6013 | rtnl_lock(); |
6014 | ||
0115e8e3 | 6015 | call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev); |
1da177e4 LT |
6016 | if (test_bit(__LINK_STATE_LINKWATCH_PENDING, |
6017 | &dev->state)) { | |
6018 | /* We must not have linkwatch events | |
6019 | * pending on unregister. If this | |
6020 | * happens, we simply run the queue | |
6021 | * unscheduled, resulting in a noop | |
6022 | * for this device. | |
6023 | */ | |
6024 | linkwatch_run_queue(); | |
6025 | } | |
6026 | ||
6756ae4b | 6027 | __rtnl_unlock(); |
1da177e4 LT |
6028 | |
6029 | rebroadcast_time = jiffies; | |
6030 | } | |
6031 | ||
6032 | msleep(250); | |
6033 | ||
29b4433d ED |
6034 | refcnt = netdev_refcnt_read(dev); |
6035 | ||
1da177e4 | 6036 | if (time_after(jiffies, warning_time + 10 * HZ)) { |
7b6cd1ce JP |
6037 | pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n", |
6038 | dev->name, refcnt); | |
1da177e4 LT |
6039 | warning_time = jiffies; |
6040 | } | |
6041 | } | |
6042 | } | |
6043 | ||
6044 | /* The sequence is: | |
6045 | * | |
6046 | * rtnl_lock(); | |
6047 | * ... | |
6048 | * register_netdevice(x1); | |
6049 | * register_netdevice(x2); | |
6050 | * ... | |
6051 | * unregister_netdevice(y1); | |
6052 | * unregister_netdevice(y2); | |
6053 | * ... | |
6054 | * rtnl_unlock(); | |
6055 | * free_netdev(y1); | |
6056 | * free_netdev(y2); | |
6057 | * | |
58ec3b4d | 6058 | * We are invoked by rtnl_unlock(). |
1da177e4 | 6059 | * This allows us to deal with problems: |
b17a7c17 | 6060 | * 1) We can delete sysfs objects which invoke hotplug |
1da177e4 LT |
6061 | * without deadlocking with linkwatch via keventd. |
6062 | * 2) Since we run with the RTNL semaphore not held, we can sleep | |
6063 | * safely in order to wait for the netdev refcnt to drop to zero. | |
58ec3b4d HX |
6064 | * |
6065 | * We must not return until all unregister events added during | |
6066 | * the interval the lock was held have been completed. | |
1da177e4 | 6067 | */ |
1da177e4 LT |
6068 | void netdev_run_todo(void) |
6069 | { | |
626ab0e6 | 6070 | struct list_head list; |
1da177e4 | 6071 | |
1da177e4 | 6072 | /* Snapshot list, allow later requests */ |
626ab0e6 | 6073 | list_replace_init(&net_todo_list, &list); |
58ec3b4d HX |
6074 | |
6075 | __rtnl_unlock(); | |
626ab0e6 | 6076 | |
0115e8e3 ED |
6077 | |
6078 | /* Wait for rcu callbacks to finish before next phase */ | |
850a545b EB |
6079 | if (!list_empty(&list)) |
6080 | rcu_barrier(); | |
6081 | ||
1da177e4 LT |
6082 | while (!list_empty(&list)) { |
6083 | struct net_device *dev | |
e5e26d75 | 6084 | = list_first_entry(&list, struct net_device, todo_list); |
1da177e4 LT |
6085 | list_del(&dev->todo_list); |
6086 | ||
748e2d93 | 6087 | rtnl_lock(); |
0115e8e3 | 6088 | call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev); |
748e2d93 | 6089 | __rtnl_unlock(); |
0115e8e3 | 6090 | |
b17a7c17 | 6091 | if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) { |
7b6cd1ce | 6092 | pr_err("network todo '%s' but state %d\n", |
b17a7c17 SH |
6093 | dev->name, dev->reg_state); |
6094 | dump_stack(); | |
6095 | continue; | |
6096 | } | |
1da177e4 | 6097 | |
b17a7c17 | 6098 | dev->reg_state = NETREG_UNREGISTERED; |
1da177e4 | 6099 | |
152102c7 | 6100 | on_each_cpu(flush_backlog, dev, 1); |
6e583ce5 | 6101 | |
b17a7c17 | 6102 | netdev_wait_allrefs(dev); |
1da177e4 | 6103 | |
b17a7c17 | 6104 | /* paranoia */ |
29b4433d | 6105 | BUG_ON(netdev_refcnt_read(dev)); |
33d480ce ED |
6106 | WARN_ON(rcu_access_pointer(dev->ip_ptr)); |
6107 | WARN_ON(rcu_access_pointer(dev->ip6_ptr)); | |
547b792c | 6108 | WARN_ON(dev->dn_ptr); |
1da177e4 | 6109 | |
b17a7c17 SH |
6110 | if (dev->destructor) |
6111 | dev->destructor(dev); | |
9093bbb2 | 6112 | |
50624c93 EB |
6113 | /* Report a network device has been unregistered */ |
6114 | rtnl_lock(); | |
6115 | dev_net(dev)->dev_unreg_count--; | |
6116 | __rtnl_unlock(); | |
6117 | wake_up(&netdev_unregistering_wq); | |
6118 | ||
9093bbb2 SH |
6119 | /* Free network device */ |
6120 | kobject_put(&dev->dev.kobj); | |
1da177e4 | 6121 | } |
1da177e4 LT |
6122 | } |
6123 | ||
3cfde79c BH |
6124 | /* Convert net_device_stats to rtnl_link_stats64. They have the same |
6125 | * fields in the same order, with only the type differing. | |
6126 | */ | |
77a1abf5 ED |
6127 | void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64, |
6128 | const struct net_device_stats *netdev_stats) | |
3cfde79c BH |
6129 | { |
6130 | #if BITS_PER_LONG == 64 | |
77a1abf5 ED |
6131 | BUILD_BUG_ON(sizeof(*stats64) != sizeof(*netdev_stats)); |
6132 | memcpy(stats64, netdev_stats, sizeof(*stats64)); | |
3cfde79c BH |
6133 | #else |
6134 | size_t i, n = sizeof(*stats64) / sizeof(u64); | |
6135 | const unsigned long *src = (const unsigned long *)netdev_stats; | |
6136 | u64 *dst = (u64 *)stats64; | |
6137 | ||
6138 | BUILD_BUG_ON(sizeof(*netdev_stats) / sizeof(unsigned long) != | |
6139 | sizeof(*stats64) / sizeof(u64)); | |
6140 | for (i = 0; i < n; i++) | |
6141 | dst[i] = src[i]; | |
6142 | #endif | |
6143 | } | |
77a1abf5 | 6144 | EXPORT_SYMBOL(netdev_stats_to_stats64); |
3cfde79c | 6145 | |
eeda3fd6 SH |
6146 | /** |
6147 | * dev_get_stats - get network device statistics | |
6148 | * @dev: device to get statistics from | |
28172739 | 6149 | * @storage: place to store stats |
eeda3fd6 | 6150 | * |
d7753516 BH |
6151 | * Get network statistics from device. Return @storage. |
6152 | * The device driver may provide its own method by setting | |
6153 | * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats; | |
6154 | * otherwise the internal statistics structure is used. | |
eeda3fd6 | 6155 | */ |
d7753516 BH |
6156 | struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev, |
6157 | struct rtnl_link_stats64 *storage) | |
7004bf25 | 6158 | { |
eeda3fd6 SH |
6159 | const struct net_device_ops *ops = dev->netdev_ops; |
6160 | ||
28172739 ED |
6161 | if (ops->ndo_get_stats64) { |
6162 | memset(storage, 0, sizeof(*storage)); | |
caf586e5 ED |
6163 | ops->ndo_get_stats64(dev, storage); |
6164 | } else if (ops->ndo_get_stats) { | |
3cfde79c | 6165 | netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev)); |
caf586e5 ED |
6166 | } else { |
6167 | netdev_stats_to_stats64(storage, &dev->stats); | |
28172739 | 6168 | } |
caf586e5 | 6169 | storage->rx_dropped += atomic_long_read(&dev->rx_dropped); |
28172739 | 6170 | return storage; |
c45d286e | 6171 | } |
eeda3fd6 | 6172 | EXPORT_SYMBOL(dev_get_stats); |
c45d286e | 6173 | |
24824a09 | 6174 | struct netdev_queue *dev_ingress_queue_create(struct net_device *dev) |
dc2b4847 | 6175 | { |
24824a09 | 6176 | struct netdev_queue *queue = dev_ingress_queue(dev); |
dc2b4847 | 6177 | |
24824a09 ED |
6178 | #ifdef CONFIG_NET_CLS_ACT |
6179 | if (queue) | |
6180 | return queue; | |
6181 | queue = kzalloc(sizeof(*queue), GFP_KERNEL); | |
6182 | if (!queue) | |
6183 | return NULL; | |
6184 | netdev_init_one_queue(dev, queue, NULL); | |
24824a09 ED |
6185 | queue->qdisc = &noop_qdisc; |
6186 | queue->qdisc_sleeping = &noop_qdisc; | |
6187 | rcu_assign_pointer(dev->ingress_queue, queue); | |
6188 | #endif | |
6189 | return queue; | |
bb949fbd DM |
6190 | } |
6191 | ||
2c60db03 ED |
6192 | static const struct ethtool_ops default_ethtool_ops; |
6193 | ||
d07d7507 SG |
6194 | void netdev_set_default_ethtool_ops(struct net_device *dev, |
6195 | const struct ethtool_ops *ops) | |
6196 | { | |
6197 | if (dev->ethtool_ops == &default_ethtool_ops) | |
6198 | dev->ethtool_ops = ops; | |
6199 | } | |
6200 | EXPORT_SYMBOL_GPL(netdev_set_default_ethtool_ops); | |
6201 | ||
74d332c1 ED |
6202 | void netdev_freemem(struct net_device *dev) |
6203 | { | |
6204 | char *addr = (char *)dev - dev->padded; | |
6205 | ||
6206 | if (is_vmalloc_addr(addr)) | |
6207 | vfree(addr); | |
6208 | else | |
6209 | kfree(addr); | |
6210 | } | |
6211 | ||
1da177e4 | 6212 | /** |
36909ea4 | 6213 | * alloc_netdev_mqs - allocate network device |
1da177e4 LT |
6214 | * @sizeof_priv: size of private data to allocate space for |
6215 | * @name: device name format string | |
6216 | * @setup: callback to initialize device | |
36909ea4 TH |
6217 | * @txqs: the number of TX subqueues to allocate |
6218 | * @rxqs: the number of RX subqueues to allocate | |
1da177e4 LT |
6219 | * |
6220 | * Allocates a struct net_device with private data area for driver use | |
f25f4e44 | 6221 | * and performs basic initialization. Also allocates subquue structs |
36909ea4 | 6222 | * for each queue on the device. |
1da177e4 | 6223 | */ |
36909ea4 TH |
6224 | struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name, |
6225 | void (*setup)(struct net_device *), | |
6226 | unsigned int txqs, unsigned int rxqs) | |
1da177e4 | 6227 | { |
1da177e4 | 6228 | struct net_device *dev; |
7943986c | 6229 | size_t alloc_size; |
1ce8e7b5 | 6230 | struct net_device *p; |
1da177e4 | 6231 | |
b6fe17d6 SH |
6232 | BUG_ON(strlen(name) >= sizeof(dev->name)); |
6233 | ||
36909ea4 | 6234 | if (txqs < 1) { |
7b6cd1ce | 6235 | pr_err("alloc_netdev: Unable to allocate device with zero queues\n"); |
55513fb4 TH |
6236 | return NULL; |
6237 | } | |
6238 | ||
36909ea4 TH |
6239 | #ifdef CONFIG_RPS |
6240 | if (rxqs < 1) { | |
7b6cd1ce | 6241 | pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n"); |
36909ea4 TH |
6242 | return NULL; |
6243 | } | |
6244 | #endif | |
6245 | ||
fd2ea0a7 | 6246 | alloc_size = sizeof(struct net_device); |
d1643d24 AD |
6247 | if (sizeof_priv) { |
6248 | /* ensure 32-byte alignment of private area */ | |
1ce8e7b5 | 6249 | alloc_size = ALIGN(alloc_size, NETDEV_ALIGN); |
d1643d24 AD |
6250 | alloc_size += sizeof_priv; |
6251 | } | |
6252 | /* ensure 32-byte alignment of whole construct */ | |
1ce8e7b5 | 6253 | alloc_size += NETDEV_ALIGN - 1; |
1da177e4 | 6254 | |
74d332c1 ED |
6255 | p = kzalloc(alloc_size, GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT); |
6256 | if (!p) | |
6257 | p = vzalloc(alloc_size); | |
62b5942a | 6258 | if (!p) |
1da177e4 | 6259 | return NULL; |
1da177e4 | 6260 | |
1ce8e7b5 | 6261 | dev = PTR_ALIGN(p, NETDEV_ALIGN); |
1da177e4 | 6262 | dev->padded = (char *)dev - (char *)p; |
ab9c73cc | 6263 | |
29b4433d ED |
6264 | dev->pcpu_refcnt = alloc_percpu(int); |
6265 | if (!dev->pcpu_refcnt) | |
74d332c1 | 6266 | goto free_dev; |
ab9c73cc | 6267 | |
ab9c73cc | 6268 | if (dev_addr_init(dev)) |
29b4433d | 6269 | goto free_pcpu; |
ab9c73cc | 6270 | |
22bedad3 | 6271 | dev_mc_init(dev); |
a748ee24 | 6272 | dev_uc_init(dev); |
ccffad25 | 6273 | |
c346dca1 | 6274 | dev_net_set(dev, &init_net); |
1da177e4 | 6275 | |
8d3bdbd5 | 6276 | dev->gso_max_size = GSO_MAX_SIZE; |
30b678d8 | 6277 | dev->gso_max_segs = GSO_MAX_SEGS; |
8d3bdbd5 | 6278 | |
8d3bdbd5 DM |
6279 | INIT_LIST_HEAD(&dev->napi_list); |
6280 | INIT_LIST_HEAD(&dev->unreg_list); | |
5cde2829 | 6281 | INIT_LIST_HEAD(&dev->close_list); |
8d3bdbd5 | 6282 | INIT_LIST_HEAD(&dev->link_watch_list); |
2f268f12 VF |
6283 | INIT_LIST_HEAD(&dev->adj_list.upper); |
6284 | INIT_LIST_HEAD(&dev->adj_list.lower); | |
6285 | INIT_LIST_HEAD(&dev->all_adj_list.upper); | |
6286 | INIT_LIST_HEAD(&dev->all_adj_list.lower); | |
8d3bdbd5 DM |
6287 | dev->priv_flags = IFF_XMIT_DST_RELEASE; |
6288 | setup(dev); | |
6289 | ||
36909ea4 TH |
6290 | dev->num_tx_queues = txqs; |
6291 | dev->real_num_tx_queues = txqs; | |
ed9af2e8 | 6292 | if (netif_alloc_netdev_queues(dev)) |
8d3bdbd5 | 6293 | goto free_all; |
e8a0464c | 6294 | |
df334545 | 6295 | #ifdef CONFIG_RPS |
36909ea4 TH |
6296 | dev->num_rx_queues = rxqs; |
6297 | dev->real_num_rx_queues = rxqs; | |
fe822240 | 6298 | if (netif_alloc_rx_queues(dev)) |
8d3bdbd5 | 6299 | goto free_all; |
df334545 | 6300 | #endif |
0a9627f2 | 6301 | |
1da177e4 | 6302 | strcpy(dev->name, name); |
cbda10fa | 6303 | dev->group = INIT_NETDEV_GROUP; |
2c60db03 ED |
6304 | if (!dev->ethtool_ops) |
6305 | dev->ethtool_ops = &default_ethtool_ops; | |
1da177e4 | 6306 | return dev; |
ab9c73cc | 6307 | |
8d3bdbd5 DM |
6308 | free_all: |
6309 | free_netdev(dev); | |
6310 | return NULL; | |
6311 | ||
29b4433d ED |
6312 | free_pcpu: |
6313 | free_percpu(dev->pcpu_refcnt); | |
60877a32 | 6314 | netif_free_tx_queues(dev); |
fe822240 TH |
6315 | #ifdef CONFIG_RPS |
6316 | kfree(dev->_rx); | |
6317 | #endif | |
6318 | ||
74d332c1 ED |
6319 | free_dev: |
6320 | netdev_freemem(dev); | |
ab9c73cc | 6321 | return NULL; |
1da177e4 | 6322 | } |
36909ea4 | 6323 | EXPORT_SYMBOL(alloc_netdev_mqs); |
1da177e4 LT |
6324 | |
6325 | /** | |
6326 | * free_netdev - free network device | |
6327 | * @dev: device | |
6328 | * | |
4ec93edb YH |
6329 | * This function does the last stage of destroying an allocated device |
6330 | * interface. The reference to the device object is released. | |
1da177e4 LT |
6331 | * If this is the last reference then it will be freed. |
6332 | */ | |
6333 | void free_netdev(struct net_device *dev) | |
6334 | { | |
d565b0a1 HX |
6335 | struct napi_struct *p, *n; |
6336 | ||
f3005d7f DL |
6337 | release_net(dev_net(dev)); |
6338 | ||
60877a32 | 6339 | netif_free_tx_queues(dev); |
fe822240 TH |
6340 | #ifdef CONFIG_RPS |
6341 | kfree(dev->_rx); | |
6342 | #endif | |
e8a0464c | 6343 | |
33d480ce | 6344 | kfree(rcu_dereference_protected(dev->ingress_queue, 1)); |
24824a09 | 6345 | |
f001fde5 JP |
6346 | /* Flush device addresses */ |
6347 | dev_addr_flush(dev); | |
6348 | ||
d565b0a1 HX |
6349 | list_for_each_entry_safe(p, n, &dev->napi_list, dev_list) |
6350 | netif_napi_del(p); | |
6351 | ||
29b4433d ED |
6352 | free_percpu(dev->pcpu_refcnt); |
6353 | dev->pcpu_refcnt = NULL; | |
6354 | ||
3041a069 | 6355 | /* Compatibility with error handling in drivers */ |
1da177e4 | 6356 | if (dev->reg_state == NETREG_UNINITIALIZED) { |
74d332c1 | 6357 | netdev_freemem(dev); |
1da177e4 LT |
6358 | return; |
6359 | } | |
6360 | ||
6361 | BUG_ON(dev->reg_state != NETREG_UNREGISTERED); | |
6362 | dev->reg_state = NETREG_RELEASED; | |
6363 | ||
43cb76d9 GKH |
6364 | /* will free via device release */ |
6365 | put_device(&dev->dev); | |
1da177e4 | 6366 | } |
d1b19dff | 6367 | EXPORT_SYMBOL(free_netdev); |
4ec93edb | 6368 | |
f0db275a SH |
6369 | /** |
6370 | * synchronize_net - Synchronize with packet receive processing | |
6371 | * | |
6372 | * Wait for packets currently being received to be done. | |
6373 | * Does not block later packets from starting. | |
6374 | */ | |
4ec93edb | 6375 | void synchronize_net(void) |
1da177e4 LT |
6376 | { |
6377 | might_sleep(); | |
be3fc413 ED |
6378 | if (rtnl_is_locked()) |
6379 | synchronize_rcu_expedited(); | |
6380 | else | |
6381 | synchronize_rcu(); | |
1da177e4 | 6382 | } |
d1b19dff | 6383 | EXPORT_SYMBOL(synchronize_net); |
1da177e4 LT |
6384 | |
6385 | /** | |
44a0873d | 6386 | * unregister_netdevice_queue - remove device from the kernel |
1da177e4 | 6387 | * @dev: device |
44a0873d | 6388 | * @head: list |
6ebfbc06 | 6389 | * |
1da177e4 | 6390 | * This function shuts down a device interface and removes it |
d59b54b1 | 6391 | * from the kernel tables. |
44a0873d | 6392 | * If head not NULL, device is queued to be unregistered later. |
1da177e4 LT |
6393 | * |
6394 | * Callers must hold the rtnl semaphore. You may want | |
6395 | * unregister_netdev() instead of this. | |
6396 | */ | |
6397 | ||
44a0873d | 6398 | void unregister_netdevice_queue(struct net_device *dev, struct list_head *head) |
1da177e4 | 6399 | { |
a6620712 HX |
6400 | ASSERT_RTNL(); |
6401 | ||
44a0873d | 6402 | if (head) { |
9fdce099 | 6403 | list_move_tail(&dev->unreg_list, head); |
44a0873d ED |
6404 | } else { |
6405 | rollback_registered(dev); | |
6406 | /* Finish processing unregister after unlock */ | |
6407 | net_set_todo(dev); | |
6408 | } | |
1da177e4 | 6409 | } |
44a0873d | 6410 | EXPORT_SYMBOL(unregister_netdevice_queue); |
1da177e4 | 6411 | |
9b5e383c ED |
6412 | /** |
6413 | * unregister_netdevice_many - unregister many devices | |
6414 | * @head: list of devices | |
9b5e383c ED |
6415 | */ |
6416 | void unregister_netdevice_many(struct list_head *head) | |
6417 | { | |
6418 | struct net_device *dev; | |
6419 | ||
6420 | if (!list_empty(head)) { | |
6421 | rollback_registered_many(head); | |
6422 | list_for_each_entry(dev, head, unreg_list) | |
6423 | net_set_todo(dev); | |
6424 | } | |
6425 | } | |
63c8099d | 6426 | EXPORT_SYMBOL(unregister_netdevice_many); |
9b5e383c | 6427 | |
1da177e4 LT |
6428 | /** |
6429 | * unregister_netdev - remove device from the kernel | |
6430 | * @dev: device | |
6431 | * | |
6432 | * This function shuts down a device interface and removes it | |
d59b54b1 | 6433 | * from the kernel tables. |
1da177e4 LT |
6434 | * |
6435 | * This is just a wrapper for unregister_netdevice that takes | |
6436 | * the rtnl semaphore. In general you want to use this and not | |
6437 | * unregister_netdevice. | |
6438 | */ | |
6439 | void unregister_netdev(struct net_device *dev) | |
6440 | { | |
6441 | rtnl_lock(); | |
6442 | unregister_netdevice(dev); | |
6443 | rtnl_unlock(); | |
6444 | } | |
1da177e4 LT |
6445 | EXPORT_SYMBOL(unregister_netdev); |
6446 | ||
ce286d32 EB |
6447 | /** |
6448 | * dev_change_net_namespace - move device to different nethost namespace | |
6449 | * @dev: device | |
6450 | * @net: network namespace | |
6451 | * @pat: If not NULL name pattern to try if the current device name | |
6452 | * is already taken in the destination network namespace. | |
6453 | * | |
6454 | * This function shuts down a device interface and moves it | |
6455 | * to a new network namespace. On success 0 is returned, on | |
6456 | * a failure a netagive errno code is returned. | |
6457 | * | |
6458 | * Callers must hold the rtnl semaphore. | |
6459 | */ | |
6460 | ||
6461 | int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat) | |
6462 | { | |
ce286d32 EB |
6463 | int err; |
6464 | ||
6465 | ASSERT_RTNL(); | |
6466 | ||
6467 | /* Don't allow namespace local devices to be moved. */ | |
6468 | err = -EINVAL; | |
6469 | if (dev->features & NETIF_F_NETNS_LOCAL) | |
6470 | goto out; | |
6471 | ||
6472 | /* Ensure the device has been registrered */ | |
ce286d32 EB |
6473 | if (dev->reg_state != NETREG_REGISTERED) |
6474 | goto out; | |
6475 | ||
6476 | /* Get out if there is nothing todo */ | |
6477 | err = 0; | |
878628fb | 6478 | if (net_eq(dev_net(dev), net)) |
ce286d32 EB |
6479 | goto out; |
6480 | ||
6481 | /* Pick the destination device name, and ensure | |
6482 | * we can use it in the destination network namespace. | |
6483 | */ | |
6484 | err = -EEXIST; | |
d9031024 | 6485 | if (__dev_get_by_name(net, dev->name)) { |
ce286d32 EB |
6486 | /* We get here if we can't use the current device name */ |
6487 | if (!pat) | |
6488 | goto out; | |
828de4f6 | 6489 | if (dev_get_valid_name(net, dev, pat) < 0) |
ce286d32 EB |
6490 | goto out; |
6491 | } | |
6492 | ||
6493 | /* | |
6494 | * And now a mini version of register_netdevice unregister_netdevice. | |
6495 | */ | |
6496 | ||
6497 | /* If device is running close it first. */ | |
9b772652 | 6498 | dev_close(dev); |
ce286d32 EB |
6499 | |
6500 | /* And unlink it from device chain */ | |
6501 | err = -ENODEV; | |
6502 | unlist_netdevice(dev); | |
6503 | ||
6504 | synchronize_net(); | |
6505 | ||
6506 | /* Shutdown queueing discipline. */ | |
6507 | dev_shutdown(dev); | |
6508 | ||
6509 | /* Notify protocols, that we are about to destroy | |
6510 | this device. They should clean all the things. | |
3b27e105 DL |
6511 | |
6512 | Note that dev->reg_state stays at NETREG_REGISTERED. | |
6513 | This is wanted because this way 8021q and macvlan know | |
6514 | the device is just moving and can keep their slaves up. | |
ce286d32 EB |
6515 | */ |
6516 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); | |
6549dd43 G |
6517 | rcu_barrier(); |
6518 | call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev); | |
7f294054 | 6519 | rtmsg_ifinfo(RTM_DELLINK, dev, ~0U, GFP_KERNEL); |
ce286d32 EB |
6520 | |
6521 | /* | |
6522 | * Flush the unicast and multicast chains | |
6523 | */ | |
a748ee24 | 6524 | dev_uc_flush(dev); |
22bedad3 | 6525 | dev_mc_flush(dev); |
ce286d32 | 6526 | |
4e66ae2e SH |
6527 | /* Send a netdev-removed uevent to the old namespace */ |
6528 | kobject_uevent(&dev->dev.kobj, KOBJ_REMOVE); | |
6529 | ||
ce286d32 | 6530 | /* Actually switch the network namespace */ |
c346dca1 | 6531 | dev_net_set(dev, net); |
ce286d32 | 6532 | |
ce286d32 EB |
6533 | /* If there is an ifindex conflict assign a new one */ |
6534 | if (__dev_get_by_index(net, dev->ifindex)) { | |
6535 | int iflink = (dev->iflink == dev->ifindex); | |
6536 | dev->ifindex = dev_new_index(net); | |
6537 | if (iflink) | |
6538 | dev->iflink = dev->ifindex; | |
6539 | } | |
6540 | ||
4e66ae2e SH |
6541 | /* Send a netdev-add uevent to the new namespace */ |
6542 | kobject_uevent(&dev->dev.kobj, KOBJ_ADD); | |
6543 | ||
8b41d188 | 6544 | /* Fixup kobjects */ |
a1b3f594 | 6545 | err = device_rename(&dev->dev, dev->name); |
8b41d188 | 6546 | WARN_ON(err); |
ce286d32 EB |
6547 | |
6548 | /* Add the device back in the hashes */ | |
6549 | list_netdevice(dev); | |
6550 | ||
6551 | /* Notify protocols, that a new device appeared. */ | |
6552 | call_netdevice_notifiers(NETDEV_REGISTER, dev); | |
6553 | ||
d90a909e EB |
6554 | /* |
6555 | * Prevent userspace races by waiting until the network | |
6556 | * device is fully setup before sending notifications. | |
6557 | */ | |
7f294054 | 6558 | rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL); |
d90a909e | 6559 | |
ce286d32 EB |
6560 | synchronize_net(); |
6561 | err = 0; | |
6562 | out: | |
6563 | return err; | |
6564 | } | |
463d0183 | 6565 | EXPORT_SYMBOL_GPL(dev_change_net_namespace); |
ce286d32 | 6566 | |
1da177e4 LT |
6567 | static int dev_cpu_callback(struct notifier_block *nfb, |
6568 | unsigned long action, | |
6569 | void *ocpu) | |
6570 | { | |
6571 | struct sk_buff **list_skb; | |
1da177e4 LT |
6572 | struct sk_buff *skb; |
6573 | unsigned int cpu, oldcpu = (unsigned long)ocpu; | |
6574 | struct softnet_data *sd, *oldsd; | |
6575 | ||
8bb78442 | 6576 | if (action != CPU_DEAD && action != CPU_DEAD_FROZEN) |
1da177e4 LT |
6577 | return NOTIFY_OK; |
6578 | ||
6579 | local_irq_disable(); | |
6580 | cpu = smp_processor_id(); | |
6581 | sd = &per_cpu(softnet_data, cpu); | |
6582 | oldsd = &per_cpu(softnet_data, oldcpu); | |
6583 | ||
6584 | /* Find end of our completion_queue. */ | |
6585 | list_skb = &sd->completion_queue; | |
6586 | while (*list_skb) | |
6587 | list_skb = &(*list_skb)->next; | |
6588 | /* Append completion queue from offline CPU. */ | |
6589 | *list_skb = oldsd->completion_queue; | |
6590 | oldsd->completion_queue = NULL; | |
6591 | ||
1da177e4 | 6592 | /* Append output queue from offline CPU. */ |
a9cbd588 CG |
6593 | if (oldsd->output_queue) { |
6594 | *sd->output_queue_tailp = oldsd->output_queue; | |
6595 | sd->output_queue_tailp = oldsd->output_queue_tailp; | |
6596 | oldsd->output_queue = NULL; | |
6597 | oldsd->output_queue_tailp = &oldsd->output_queue; | |
6598 | } | |
264524d5 HC |
6599 | /* Append NAPI poll list from offline CPU. */ |
6600 | if (!list_empty(&oldsd->poll_list)) { | |
6601 | list_splice_init(&oldsd->poll_list, &sd->poll_list); | |
6602 | raise_softirq_irqoff(NET_RX_SOFTIRQ); | |
6603 | } | |
1da177e4 LT |
6604 | |
6605 | raise_softirq_irqoff(NET_TX_SOFTIRQ); | |
6606 | local_irq_enable(); | |
6607 | ||
6608 | /* Process offline CPU's input_pkt_queue */ | |
76cc8b13 | 6609 | while ((skb = __skb_dequeue(&oldsd->process_queue))) { |
1da177e4 | 6610 | netif_rx(skb); |
76cc8b13 | 6611 | input_queue_head_incr(oldsd); |
fec5e652 | 6612 | } |
76cc8b13 | 6613 | while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) { |
6e7676c1 | 6614 | netif_rx(skb); |
76cc8b13 TH |
6615 | input_queue_head_incr(oldsd); |
6616 | } | |
1da177e4 LT |
6617 | |
6618 | return NOTIFY_OK; | |
6619 | } | |
1da177e4 LT |
6620 | |
6621 | ||
7f353bf2 | 6622 | /** |
b63365a2 HX |
6623 | * netdev_increment_features - increment feature set by one |
6624 | * @all: current feature set | |
6625 | * @one: new feature set | |
6626 | * @mask: mask feature set | |
7f353bf2 HX |
6627 | * |
6628 | * Computes a new feature set after adding a device with feature set | |
b63365a2 HX |
6629 | * @one to the master device with current feature set @all. Will not |
6630 | * enable anything that is off in @mask. Returns the new feature set. | |
7f353bf2 | 6631 | */ |
c8f44aff MM |
6632 | netdev_features_t netdev_increment_features(netdev_features_t all, |
6633 | netdev_features_t one, netdev_features_t mask) | |
b63365a2 | 6634 | { |
1742f183 MM |
6635 | if (mask & NETIF_F_GEN_CSUM) |
6636 | mask |= NETIF_F_ALL_CSUM; | |
6637 | mask |= NETIF_F_VLAN_CHALLENGED; | |
7f353bf2 | 6638 | |
1742f183 MM |
6639 | all |= one & (NETIF_F_ONE_FOR_ALL|NETIF_F_ALL_CSUM) & mask; |
6640 | all &= one | ~NETIF_F_ALL_FOR_ALL; | |
c6e1a0d1 | 6641 | |
1742f183 MM |
6642 | /* If one device supports hw checksumming, set for all. */ |
6643 | if (all & NETIF_F_GEN_CSUM) | |
6644 | all &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_GEN_CSUM); | |
7f353bf2 HX |
6645 | |
6646 | return all; | |
6647 | } | |
b63365a2 | 6648 | EXPORT_SYMBOL(netdev_increment_features); |
7f353bf2 | 6649 | |
430f03cd | 6650 | static struct hlist_head * __net_init netdev_create_hash(void) |
30d97d35 PE |
6651 | { |
6652 | int i; | |
6653 | struct hlist_head *hash; | |
6654 | ||
6655 | hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL); | |
6656 | if (hash != NULL) | |
6657 | for (i = 0; i < NETDEV_HASHENTRIES; i++) | |
6658 | INIT_HLIST_HEAD(&hash[i]); | |
6659 | ||
6660 | return hash; | |
6661 | } | |
6662 | ||
881d966b | 6663 | /* Initialize per network namespace state */ |
4665079c | 6664 | static int __net_init netdev_init(struct net *net) |
881d966b | 6665 | { |
734b6541 RM |
6666 | if (net != &init_net) |
6667 | INIT_LIST_HEAD(&net->dev_base_head); | |
881d966b | 6668 | |
30d97d35 PE |
6669 | net->dev_name_head = netdev_create_hash(); |
6670 | if (net->dev_name_head == NULL) | |
6671 | goto err_name; | |
881d966b | 6672 | |
30d97d35 PE |
6673 | net->dev_index_head = netdev_create_hash(); |
6674 | if (net->dev_index_head == NULL) | |
6675 | goto err_idx; | |
881d966b EB |
6676 | |
6677 | return 0; | |
30d97d35 PE |
6678 | |
6679 | err_idx: | |
6680 | kfree(net->dev_name_head); | |
6681 | err_name: | |
6682 | return -ENOMEM; | |
881d966b EB |
6683 | } |
6684 | ||
f0db275a SH |
6685 | /** |
6686 | * netdev_drivername - network driver for the device | |
6687 | * @dev: network device | |
f0db275a SH |
6688 | * |
6689 | * Determine network driver for device. | |
6690 | */ | |
3019de12 | 6691 | const char *netdev_drivername(const struct net_device *dev) |
6579e57b | 6692 | { |
cf04a4c7 SH |
6693 | const struct device_driver *driver; |
6694 | const struct device *parent; | |
3019de12 | 6695 | const char *empty = ""; |
6579e57b AV |
6696 | |
6697 | parent = dev->dev.parent; | |
6579e57b | 6698 | if (!parent) |
3019de12 | 6699 | return empty; |
6579e57b AV |
6700 | |
6701 | driver = parent->driver; | |
6702 | if (driver && driver->name) | |
3019de12 DM |
6703 | return driver->name; |
6704 | return empty; | |
6579e57b AV |
6705 | } |
6706 | ||
b004ff49 | 6707 | static int __netdev_printk(const char *level, const struct net_device *dev, |
256df2f3 JP |
6708 | struct va_format *vaf) |
6709 | { | |
6710 | int r; | |
6711 | ||
b004ff49 | 6712 | if (dev && dev->dev.parent) { |
666f355f JP |
6713 | r = dev_printk_emit(level[1] - '0', |
6714 | dev->dev.parent, | |
6715 | "%s %s %s: %pV", | |
6716 | dev_driver_string(dev->dev.parent), | |
6717 | dev_name(dev->dev.parent), | |
6718 | netdev_name(dev), vaf); | |
b004ff49 | 6719 | } else if (dev) { |
256df2f3 | 6720 | r = printk("%s%s: %pV", level, netdev_name(dev), vaf); |
b004ff49 | 6721 | } else { |
256df2f3 | 6722 | r = printk("%s(NULL net_device): %pV", level, vaf); |
b004ff49 | 6723 | } |
256df2f3 JP |
6724 | |
6725 | return r; | |
6726 | } | |
6727 | ||
6728 | int netdev_printk(const char *level, const struct net_device *dev, | |
6729 | const char *format, ...) | |
6730 | { | |
6731 | struct va_format vaf; | |
6732 | va_list args; | |
6733 | int r; | |
6734 | ||
6735 | va_start(args, format); | |
6736 | ||
6737 | vaf.fmt = format; | |
6738 | vaf.va = &args; | |
6739 | ||
6740 | r = __netdev_printk(level, dev, &vaf); | |
b004ff49 | 6741 | |
256df2f3 JP |
6742 | va_end(args); |
6743 | ||
6744 | return r; | |
6745 | } | |
6746 | EXPORT_SYMBOL(netdev_printk); | |
6747 | ||
6748 | #define define_netdev_printk_level(func, level) \ | |
6749 | int func(const struct net_device *dev, const char *fmt, ...) \ | |
6750 | { \ | |
6751 | int r; \ | |
6752 | struct va_format vaf; \ | |
6753 | va_list args; \ | |
6754 | \ | |
6755 | va_start(args, fmt); \ | |
6756 | \ | |
6757 | vaf.fmt = fmt; \ | |
6758 | vaf.va = &args; \ | |
6759 | \ | |
6760 | r = __netdev_printk(level, dev, &vaf); \ | |
b004ff49 | 6761 | \ |
256df2f3 JP |
6762 | va_end(args); \ |
6763 | \ | |
6764 | return r; \ | |
6765 | } \ | |
6766 | EXPORT_SYMBOL(func); | |
6767 | ||
6768 | define_netdev_printk_level(netdev_emerg, KERN_EMERG); | |
6769 | define_netdev_printk_level(netdev_alert, KERN_ALERT); | |
6770 | define_netdev_printk_level(netdev_crit, KERN_CRIT); | |
6771 | define_netdev_printk_level(netdev_err, KERN_ERR); | |
6772 | define_netdev_printk_level(netdev_warn, KERN_WARNING); | |
6773 | define_netdev_printk_level(netdev_notice, KERN_NOTICE); | |
6774 | define_netdev_printk_level(netdev_info, KERN_INFO); | |
6775 | ||
4665079c | 6776 | static void __net_exit netdev_exit(struct net *net) |
881d966b EB |
6777 | { |
6778 | kfree(net->dev_name_head); | |
6779 | kfree(net->dev_index_head); | |
6780 | } | |
6781 | ||
022cbae6 | 6782 | static struct pernet_operations __net_initdata netdev_net_ops = { |
881d966b EB |
6783 | .init = netdev_init, |
6784 | .exit = netdev_exit, | |
6785 | }; | |
6786 | ||
4665079c | 6787 | static void __net_exit default_device_exit(struct net *net) |
ce286d32 | 6788 | { |
e008b5fc | 6789 | struct net_device *dev, *aux; |
ce286d32 | 6790 | /* |
e008b5fc | 6791 | * Push all migratable network devices back to the |
ce286d32 EB |
6792 | * initial network namespace |
6793 | */ | |
6794 | rtnl_lock(); | |
e008b5fc | 6795 | for_each_netdev_safe(net, dev, aux) { |
ce286d32 | 6796 | int err; |
aca51397 | 6797 | char fb_name[IFNAMSIZ]; |
ce286d32 EB |
6798 | |
6799 | /* Ignore unmoveable devices (i.e. loopback) */ | |
6800 | if (dev->features & NETIF_F_NETNS_LOCAL) | |
6801 | continue; | |
6802 | ||
e008b5fc EB |
6803 | /* Leave virtual devices for the generic cleanup */ |
6804 | if (dev->rtnl_link_ops) | |
6805 | continue; | |
d0c082ce | 6806 | |
25985edc | 6807 | /* Push remaining network devices to init_net */ |
aca51397 PE |
6808 | snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex); |
6809 | err = dev_change_net_namespace(dev, &init_net, fb_name); | |
ce286d32 | 6810 | if (err) { |
7b6cd1ce JP |
6811 | pr_emerg("%s: failed to move %s to init_net: %d\n", |
6812 | __func__, dev->name, err); | |
aca51397 | 6813 | BUG(); |
ce286d32 EB |
6814 | } |
6815 | } | |
6816 | rtnl_unlock(); | |
6817 | } | |
6818 | ||
50624c93 EB |
6819 | static void __net_exit rtnl_lock_unregistering(struct list_head *net_list) |
6820 | { | |
6821 | /* Return with the rtnl_lock held when there are no network | |
6822 | * devices unregistering in any network namespace in net_list. | |
6823 | */ | |
6824 | struct net *net; | |
6825 | bool unregistering; | |
6826 | DEFINE_WAIT(wait); | |
6827 | ||
6828 | for (;;) { | |
6829 | prepare_to_wait(&netdev_unregistering_wq, &wait, | |
6830 | TASK_UNINTERRUPTIBLE); | |
6831 | unregistering = false; | |
6832 | rtnl_lock(); | |
6833 | list_for_each_entry(net, net_list, exit_list) { | |
6834 | if (net->dev_unreg_count > 0) { | |
6835 | unregistering = true; | |
6836 | break; | |
6837 | } | |
6838 | } | |
6839 | if (!unregistering) | |
6840 | break; | |
6841 | __rtnl_unlock(); | |
6842 | schedule(); | |
6843 | } | |
6844 | finish_wait(&netdev_unregistering_wq, &wait); | |
6845 | } | |
6846 | ||
04dc7f6b EB |
6847 | static void __net_exit default_device_exit_batch(struct list_head *net_list) |
6848 | { | |
6849 | /* At exit all network devices most be removed from a network | |
b595076a | 6850 | * namespace. Do this in the reverse order of registration. |
04dc7f6b EB |
6851 | * Do this across as many network namespaces as possible to |
6852 | * improve batching efficiency. | |
6853 | */ | |
6854 | struct net_device *dev; | |
6855 | struct net *net; | |
6856 | LIST_HEAD(dev_kill_list); | |
6857 | ||
50624c93 EB |
6858 | /* To prevent network device cleanup code from dereferencing |
6859 | * loopback devices or network devices that have been freed | |
6860 | * wait here for all pending unregistrations to complete, | |
6861 | * before unregistring the loopback device and allowing the | |
6862 | * network namespace be freed. | |
6863 | * | |
6864 | * The netdev todo list containing all network devices | |
6865 | * unregistrations that happen in default_device_exit_batch | |
6866 | * will run in the rtnl_unlock() at the end of | |
6867 | * default_device_exit_batch. | |
6868 | */ | |
6869 | rtnl_lock_unregistering(net_list); | |
04dc7f6b EB |
6870 | list_for_each_entry(net, net_list, exit_list) { |
6871 | for_each_netdev_reverse(net, dev) { | |
6872 | if (dev->rtnl_link_ops) | |
6873 | dev->rtnl_link_ops->dellink(dev, &dev_kill_list); | |
6874 | else | |
6875 | unregister_netdevice_queue(dev, &dev_kill_list); | |
6876 | } | |
6877 | } | |
6878 | unregister_netdevice_many(&dev_kill_list); | |
ceaaec98 | 6879 | list_del(&dev_kill_list); |
04dc7f6b EB |
6880 | rtnl_unlock(); |
6881 | } | |
6882 | ||
022cbae6 | 6883 | static struct pernet_operations __net_initdata default_device_ops = { |
ce286d32 | 6884 | .exit = default_device_exit, |
04dc7f6b | 6885 | .exit_batch = default_device_exit_batch, |
ce286d32 EB |
6886 | }; |
6887 | ||
1da177e4 LT |
6888 | /* |
6889 | * Initialize the DEV module. At boot time this walks the device list and | |
6890 | * unhooks any devices that fail to initialise (normally hardware not | |
6891 | * present) and leaves us with a valid list of present and active devices. | |
6892 | * | |
6893 | */ | |
6894 | ||
6895 | /* | |
6896 | * This is called single threaded during boot, so no need | |
6897 | * to take the rtnl semaphore. | |
6898 | */ | |
6899 | static int __init net_dev_init(void) | |
6900 | { | |
6901 | int i, rc = -ENOMEM; | |
6902 | ||
6903 | BUG_ON(!dev_boot_phase); | |
6904 | ||
1da177e4 LT |
6905 | if (dev_proc_init()) |
6906 | goto out; | |
6907 | ||
8b41d188 | 6908 | if (netdev_kobject_init()) |
1da177e4 LT |
6909 | goto out; |
6910 | ||
6911 | INIT_LIST_HEAD(&ptype_all); | |
82d8a867 | 6912 | for (i = 0; i < PTYPE_HASH_SIZE; i++) |
1da177e4 LT |
6913 | INIT_LIST_HEAD(&ptype_base[i]); |
6914 | ||
62532da9 VY |
6915 | INIT_LIST_HEAD(&offload_base); |
6916 | ||
881d966b EB |
6917 | if (register_pernet_subsys(&netdev_net_ops)) |
6918 | goto out; | |
1da177e4 LT |
6919 | |
6920 | /* | |
6921 | * Initialise the packet receive queues. | |
6922 | */ | |
6923 | ||
6f912042 | 6924 | for_each_possible_cpu(i) { |
e36fa2f7 | 6925 | struct softnet_data *sd = &per_cpu(softnet_data, i); |
1da177e4 | 6926 | |
dee42870 | 6927 | memset(sd, 0, sizeof(*sd)); |
e36fa2f7 | 6928 | skb_queue_head_init(&sd->input_pkt_queue); |
6e7676c1 | 6929 | skb_queue_head_init(&sd->process_queue); |
e36fa2f7 ED |
6930 | sd->completion_queue = NULL; |
6931 | INIT_LIST_HEAD(&sd->poll_list); | |
a9cbd588 CG |
6932 | sd->output_queue = NULL; |
6933 | sd->output_queue_tailp = &sd->output_queue; | |
df334545 | 6934 | #ifdef CONFIG_RPS |
e36fa2f7 ED |
6935 | sd->csd.func = rps_trigger_softirq; |
6936 | sd->csd.info = sd; | |
6937 | sd->csd.flags = 0; | |
6938 | sd->cpu = i; | |
1e94d72f | 6939 | #endif |
0a9627f2 | 6940 | |
e36fa2f7 ED |
6941 | sd->backlog.poll = process_backlog; |
6942 | sd->backlog.weight = weight_p; | |
6943 | sd->backlog.gro_list = NULL; | |
6944 | sd->backlog.gro_count = 0; | |
99bbc707 WB |
6945 | |
6946 | #ifdef CONFIG_NET_FLOW_LIMIT | |
6947 | sd->flow_limit = NULL; | |
6948 | #endif | |
1da177e4 LT |
6949 | } |
6950 | ||
1da177e4 LT |
6951 | dev_boot_phase = 0; |
6952 | ||
505d4f73 EB |
6953 | /* The loopback device is special if any other network devices |
6954 | * is present in a network namespace the loopback device must | |
6955 | * be present. Since we now dynamically allocate and free the | |
6956 | * loopback device ensure this invariant is maintained by | |
6957 | * keeping the loopback device as the first device on the | |
6958 | * list of network devices. Ensuring the loopback devices | |
6959 | * is the first device that appears and the last network device | |
6960 | * that disappears. | |
6961 | */ | |
6962 | if (register_pernet_device(&loopback_net_ops)) | |
6963 | goto out; | |
6964 | ||
6965 | if (register_pernet_device(&default_device_ops)) | |
6966 | goto out; | |
6967 | ||
962cf36c CM |
6968 | open_softirq(NET_TX_SOFTIRQ, net_tx_action); |
6969 | open_softirq(NET_RX_SOFTIRQ, net_rx_action); | |
1da177e4 LT |
6970 | |
6971 | hotcpu_notifier(dev_cpu_callback, 0); | |
6972 | dst_init(); | |
1da177e4 LT |
6973 | rc = 0; |
6974 | out: | |
6975 | return rc; | |
6976 | } | |
6977 | ||
6978 | subsys_initcall(net_dev_init); |