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Commit | Line | Data |
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1da177e4 | 1 | /* |
722c9a0c | 2 | * NET3 Protocol independent device support routines. |
1da177e4 LT |
3 | * |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * Derived from the non IP parts of dev.c 1.0.19 | |
722c9a0c | 10 | * Authors: Ross Biro |
1da177e4 LT |
11 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
12 | * Mark Evans, <evansmp@uhura.aston.ac.uk> | |
13 | * | |
14 | * Additional Authors: | |
15 | * Florian la Roche <rzsfl@rz.uni-sb.de> | |
16 | * Alan Cox <gw4pts@gw4pts.ampr.org> | |
17 | * David Hinds <dahinds@users.sourceforge.net> | |
18 | * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> | |
19 | * Adam Sulmicki <adam@cfar.umd.edu> | |
20 | * Pekka Riikonen <priikone@poesidon.pspt.fi> | |
21 | * | |
22 | * Changes: | |
23 | * D.J. Barrow : Fixed bug where dev->refcnt gets set | |
722c9a0c | 24 | * to 2 if register_netdev gets called |
25 | * before net_dev_init & also removed a | |
26 | * few lines of code in the process. | |
1da177e4 LT |
27 | * Alan Cox : device private ioctl copies fields back. |
28 | * Alan Cox : Transmit queue code does relevant | |
29 | * stunts to keep the queue safe. | |
30 | * Alan Cox : Fixed double lock. | |
31 | * Alan Cox : Fixed promisc NULL pointer trap | |
32 | * ???????? : Support the full private ioctl range | |
33 | * Alan Cox : Moved ioctl permission check into | |
34 | * drivers | |
35 | * Tim Kordas : SIOCADDMULTI/SIOCDELMULTI | |
36 | * Alan Cox : 100 backlog just doesn't cut it when | |
37 | * you start doing multicast video 8) | |
38 | * Alan Cox : Rewrote net_bh and list manager. | |
722c9a0c | 39 | * Alan Cox : Fix ETH_P_ALL echoback lengths. |
1da177e4 LT |
40 | * Alan Cox : Took out transmit every packet pass |
41 | * Saved a few bytes in the ioctl handler | |
42 | * Alan Cox : Network driver sets packet type before | |
43 | * calling netif_rx. Saves a function | |
44 | * call a packet. | |
45 | * Alan Cox : Hashed net_bh() | |
46 | * Richard Kooijman: Timestamp fixes. | |
47 | * Alan Cox : Wrong field in SIOCGIFDSTADDR | |
48 | * Alan Cox : Device lock protection. | |
722c9a0c | 49 | * Alan Cox : Fixed nasty side effect of device close |
1da177e4 LT |
50 | * changes. |
51 | * Rudi Cilibrasi : Pass the right thing to | |
52 | * set_mac_address() | |
53 | * Dave Miller : 32bit quantity for the device lock to | |
54 | * make it work out on a Sparc. | |
55 | * Bjorn Ekwall : Added KERNELD hack. | |
56 | * Alan Cox : Cleaned up the backlog initialise. | |
57 | * Craig Metz : SIOCGIFCONF fix if space for under | |
58 | * 1 device. | |
59 | * Thomas Bogendoerfer : Return ENODEV for dev_open, if there | |
60 | * is no device open function. | |
61 | * Andi Kleen : Fix error reporting for SIOCGIFCONF | |
62 | * Michael Chastain : Fix signed/unsigned for SIOCGIFCONF | |
63 | * Cyrus Durgin : Cleaned for KMOD | |
64 | * Adam Sulmicki : Bug Fix : Network Device Unload | |
65 | * A network device unload needs to purge | |
66 | * the backlog queue. | |
67 | * Paul Rusty Russell : SIOCSIFNAME | |
68 | * Pekka Riikonen : Netdev boot-time settings code | |
69 | * Andrew Morton : Make unregister_netdevice wait | |
722c9a0c | 70 | * indefinitely on dev->refcnt |
71 | * J Hadi Salim : - Backlog queue sampling | |
1da177e4 LT |
72 | * - netif_rx() feedback |
73 | */ | |
74 | ||
7c0f6ba6 | 75 | #include <linux/uaccess.h> |
1da177e4 | 76 | #include <linux/bitops.h> |
4fc268d2 | 77 | #include <linux/capability.h> |
1da177e4 LT |
78 | #include <linux/cpu.h> |
79 | #include <linux/types.h> | |
80 | #include <linux/kernel.h> | |
08e9897d | 81 | #include <linux/hash.h> |
5a0e3ad6 | 82 | #include <linux/slab.h> |
1da177e4 | 83 | #include <linux/sched.h> |
f1083048 | 84 | #include <linux/sched/mm.h> |
4a3e2f71 | 85 | #include <linux/mutex.h> |
1da177e4 LT |
86 | #include <linux/string.h> |
87 | #include <linux/mm.h> | |
88 | #include <linux/socket.h> | |
89 | #include <linux/sockios.h> | |
90 | #include <linux/errno.h> | |
91 | #include <linux/interrupt.h> | |
92 | #include <linux/if_ether.h> | |
93 | #include <linux/netdevice.h> | |
94 | #include <linux/etherdevice.h> | |
0187bdfb | 95 | #include <linux/ethtool.h> |
1da177e4 LT |
96 | #include <linux/notifier.h> |
97 | #include <linux/skbuff.h> | |
a7862b45 | 98 | #include <linux/bpf.h> |
b5cdae32 | 99 | #include <linux/bpf_trace.h> |
457c4cbc | 100 | #include <net/net_namespace.h> |
1da177e4 | 101 | #include <net/sock.h> |
02d62e86 | 102 | #include <net/busy_poll.h> |
1da177e4 | 103 | #include <linux/rtnetlink.h> |
1da177e4 | 104 | #include <linux/stat.h> |
1da177e4 | 105 | #include <net/dst.h> |
fc4099f1 | 106 | #include <net/dst_metadata.h> |
1da177e4 | 107 | #include <net/pkt_sched.h> |
87d83093 | 108 | #include <net/pkt_cls.h> |
1da177e4 | 109 | #include <net/checksum.h> |
44540960 | 110 | #include <net/xfrm.h> |
1da177e4 LT |
111 | #include <linux/highmem.h> |
112 | #include <linux/init.h> | |
1da177e4 | 113 | #include <linux/module.h> |
1da177e4 LT |
114 | #include <linux/netpoll.h> |
115 | #include <linux/rcupdate.h> | |
116 | #include <linux/delay.h> | |
1da177e4 | 117 | #include <net/iw_handler.h> |
1da177e4 | 118 | #include <asm/current.h> |
5bdb9886 | 119 | #include <linux/audit.h> |
db217334 | 120 | #include <linux/dmaengine.h> |
f6a78bfc | 121 | #include <linux/err.h> |
c7fa9d18 | 122 | #include <linux/ctype.h> |
723e98b7 | 123 | #include <linux/if_arp.h> |
6de329e2 | 124 | #include <linux/if_vlan.h> |
8f0f2223 | 125 | #include <linux/ip.h> |
ad55dcaf | 126 | #include <net/ip.h> |
25cd9ba0 | 127 | #include <net/mpls.h> |
8f0f2223 DM |
128 | #include <linux/ipv6.h> |
129 | #include <linux/in.h> | |
b6b2fed1 DM |
130 | #include <linux/jhash.h> |
131 | #include <linux/random.h> | |
9cbc1cb8 | 132 | #include <trace/events/napi.h> |
cf66ba58 | 133 | #include <trace/events/net.h> |
07dc22e7 | 134 | #include <trace/events/skb.h> |
5acbbd42 | 135 | #include <linux/pci.h> |
caeda9b9 | 136 | #include <linux/inetdevice.h> |
c445477d | 137 | #include <linux/cpu_rmap.h> |
c5905afb | 138 | #include <linux/static_key.h> |
af12fa6e | 139 | #include <linux/hashtable.h> |
60877a32 | 140 | #include <linux/vmalloc.h> |
529d0489 | 141 | #include <linux/if_macvlan.h> |
e7fd2885 | 142 | #include <linux/errqueue.h> |
3b47d303 | 143 | #include <linux/hrtimer.h> |
e687ad60 | 144 | #include <linux/netfilter_ingress.h> |
40e4e713 | 145 | #include <linux/crash_dump.h> |
b72b5bf6 | 146 | #include <linux/sctp.h> |
ae847f40 | 147 | #include <net/udp_tunnel.h> |
6621dd29 | 148 | #include <linux/net_namespace.h> |
1da177e4 | 149 | |
342709ef PE |
150 | #include "net-sysfs.h" |
151 | ||
d565b0a1 HX |
152 | #define MAX_GRO_SKBS 8 |
153 | ||
5d38a079 HX |
154 | /* This should be increased if a protocol with a bigger head is added. */ |
155 | #define GRO_MAX_HEAD (MAX_HEADER + 128) | |
156 | ||
1da177e4 | 157 | static DEFINE_SPINLOCK(ptype_lock); |
62532da9 | 158 | static DEFINE_SPINLOCK(offload_lock); |
900ff8c6 CW |
159 | struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly; |
160 | struct list_head ptype_all __read_mostly; /* Taps */ | |
62532da9 | 161 | static struct list_head offload_base __read_mostly; |
1da177e4 | 162 | |
ae78dbfa | 163 | static int netif_rx_internal(struct sk_buff *skb); |
54951194 | 164 | static int call_netdevice_notifiers_info(unsigned long val, |
54951194 | 165 | struct netdev_notifier_info *info); |
90b602f8 | 166 | static struct napi_struct *napi_by_id(unsigned int napi_id); |
ae78dbfa | 167 | |
1da177e4 | 168 | /* |
7562f876 | 169 | * The @dev_base_head list is protected by @dev_base_lock and the rtnl |
1da177e4 LT |
170 | * semaphore. |
171 | * | |
c6d14c84 | 172 | * Pure readers hold dev_base_lock for reading, or rcu_read_lock() |
1da177e4 LT |
173 | * |
174 | * Writers must hold the rtnl semaphore while they loop through the | |
7562f876 | 175 | * dev_base_head list, and hold dev_base_lock for writing when they do the |
1da177e4 LT |
176 | * actual updates. This allows pure readers to access the list even |
177 | * while a writer is preparing to update it. | |
178 | * | |
179 | * To put it another way, dev_base_lock is held for writing only to | |
180 | * protect against pure readers; the rtnl semaphore provides the | |
181 | * protection against other writers. | |
182 | * | |
183 | * See, for example usages, register_netdevice() and | |
184 | * unregister_netdevice(), which must be called with the rtnl | |
185 | * semaphore held. | |
186 | */ | |
1da177e4 | 187 | DEFINE_RWLOCK(dev_base_lock); |
1da177e4 LT |
188 | EXPORT_SYMBOL(dev_base_lock); |
189 | ||
6c557001 FW |
190 | static DEFINE_MUTEX(ifalias_mutex); |
191 | ||
af12fa6e ET |
192 | /* protects napi_hash addition/deletion and napi_gen_id */ |
193 | static DEFINE_SPINLOCK(napi_hash_lock); | |
194 | ||
52bd2d62 | 195 | static unsigned int napi_gen_id = NR_CPUS; |
6180d9de | 196 | static DEFINE_READ_MOSTLY_HASHTABLE(napi_hash, 8); |
af12fa6e | 197 | |
18afa4b0 | 198 | static seqcount_t devnet_rename_seq; |
c91f6df2 | 199 | |
4e985ada TG |
200 | static inline void dev_base_seq_inc(struct net *net) |
201 | { | |
643aa9cb | 202 | while (++net->dev_base_seq == 0) |
203 | ; | |
4e985ada TG |
204 | } |
205 | ||
881d966b | 206 | static inline struct hlist_head *dev_name_hash(struct net *net, const char *name) |
1da177e4 | 207 | { |
8387ff25 | 208 | unsigned int hash = full_name_hash(net, name, strnlen(name, IFNAMSIZ)); |
95c96174 | 209 | |
08e9897d | 210 | return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)]; |
1da177e4 LT |
211 | } |
212 | ||
881d966b | 213 | static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex) |
1da177e4 | 214 | { |
7c28bd0b | 215 | return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)]; |
1da177e4 LT |
216 | } |
217 | ||
e36fa2f7 | 218 | static inline void rps_lock(struct softnet_data *sd) |
152102c7 CG |
219 | { |
220 | #ifdef CONFIG_RPS | |
e36fa2f7 | 221 | spin_lock(&sd->input_pkt_queue.lock); |
152102c7 CG |
222 | #endif |
223 | } | |
224 | ||
e36fa2f7 | 225 | static inline void rps_unlock(struct softnet_data *sd) |
152102c7 CG |
226 | { |
227 | #ifdef CONFIG_RPS | |
e36fa2f7 | 228 | spin_unlock(&sd->input_pkt_queue.lock); |
152102c7 CG |
229 | #endif |
230 | } | |
231 | ||
ce286d32 | 232 | /* Device list insertion */ |
53759be9 | 233 | static void list_netdevice(struct net_device *dev) |
ce286d32 | 234 | { |
c346dca1 | 235 | struct net *net = dev_net(dev); |
ce286d32 EB |
236 | |
237 | ASSERT_RTNL(); | |
238 | ||
239 | write_lock_bh(&dev_base_lock); | |
c6d14c84 | 240 | list_add_tail_rcu(&dev->dev_list, &net->dev_base_head); |
72c9528b | 241 | hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name)); |
fb699dfd ED |
242 | hlist_add_head_rcu(&dev->index_hlist, |
243 | dev_index_hash(net, dev->ifindex)); | |
ce286d32 | 244 | write_unlock_bh(&dev_base_lock); |
4e985ada TG |
245 | |
246 | dev_base_seq_inc(net); | |
ce286d32 EB |
247 | } |
248 | ||
fb699dfd ED |
249 | /* Device list removal |
250 | * caller must respect a RCU grace period before freeing/reusing dev | |
251 | */ | |
ce286d32 EB |
252 | static void unlist_netdevice(struct net_device *dev) |
253 | { | |
254 | ASSERT_RTNL(); | |
255 | ||
256 | /* Unlink dev from the device chain */ | |
257 | write_lock_bh(&dev_base_lock); | |
c6d14c84 | 258 | list_del_rcu(&dev->dev_list); |
72c9528b | 259 | hlist_del_rcu(&dev->name_hlist); |
fb699dfd | 260 | hlist_del_rcu(&dev->index_hlist); |
ce286d32 | 261 | write_unlock_bh(&dev_base_lock); |
4e985ada TG |
262 | |
263 | dev_base_seq_inc(dev_net(dev)); | |
ce286d32 EB |
264 | } |
265 | ||
1da177e4 LT |
266 | /* |
267 | * Our notifier list | |
268 | */ | |
269 | ||
f07d5b94 | 270 | static RAW_NOTIFIER_HEAD(netdev_chain); |
1da177e4 LT |
271 | |
272 | /* | |
273 | * Device drivers call our routines to queue packets here. We empty the | |
274 | * queue in the local softnet handler. | |
275 | */ | |
bea3348e | 276 | |
9958da05 | 277 | DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data); |
d1b19dff | 278 | EXPORT_PER_CPU_SYMBOL(softnet_data); |
1da177e4 | 279 | |
cf508b12 | 280 | #ifdef CONFIG_LOCKDEP |
723e98b7 | 281 | /* |
c773e847 | 282 | * register_netdevice() inits txq->_xmit_lock and sets lockdep class |
723e98b7 JP |
283 | * according to dev->type |
284 | */ | |
643aa9cb | 285 | static const unsigned short netdev_lock_type[] = { |
286 | ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25, | |
723e98b7 JP |
287 | ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET, |
288 | ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM, | |
289 | ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP, | |
290 | ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD, | |
291 | ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25, | |
292 | ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP, | |
293 | ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD, | |
294 | ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI, | |
295 | ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE, | |
296 | ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET, | |
297 | ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL, | |
211ed865 PG |
298 | ARPHRD_FCFABRIC, ARPHRD_IEEE80211, ARPHRD_IEEE80211_PRISM, |
299 | ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET, ARPHRD_PHONET_PIPE, | |
300 | ARPHRD_IEEE802154, ARPHRD_VOID, ARPHRD_NONE}; | |
723e98b7 | 301 | |
643aa9cb | 302 | static const char *const netdev_lock_name[] = { |
303 | "_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25", | |
304 | "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET", | |
305 | "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM", | |
306 | "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP", | |
307 | "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD", | |
308 | "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25", | |
309 | "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP", | |
310 | "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD", | |
311 | "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI", | |
312 | "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE", | |
313 | "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET", | |
314 | "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL", | |
315 | "_xmit_FCFABRIC", "_xmit_IEEE80211", "_xmit_IEEE80211_PRISM", | |
316 | "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", "_xmit_PHONET_PIPE", | |
317 | "_xmit_IEEE802154", "_xmit_VOID", "_xmit_NONE"}; | |
723e98b7 JP |
318 | |
319 | static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)]; | |
cf508b12 | 320 | static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)]; |
723e98b7 JP |
321 | |
322 | static inline unsigned short netdev_lock_pos(unsigned short dev_type) | |
323 | { | |
324 | int i; | |
325 | ||
326 | for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++) | |
327 | if (netdev_lock_type[i] == dev_type) | |
328 | return i; | |
329 | /* the last key is used by default */ | |
330 | return ARRAY_SIZE(netdev_lock_type) - 1; | |
331 | } | |
332 | ||
cf508b12 DM |
333 | static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock, |
334 | unsigned short dev_type) | |
723e98b7 JP |
335 | { |
336 | int i; | |
337 | ||
338 | i = netdev_lock_pos(dev_type); | |
339 | lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i], | |
340 | netdev_lock_name[i]); | |
341 | } | |
cf508b12 DM |
342 | |
343 | static inline void netdev_set_addr_lockdep_class(struct net_device *dev) | |
344 | { | |
345 | int i; | |
346 | ||
347 | i = netdev_lock_pos(dev->type); | |
348 | lockdep_set_class_and_name(&dev->addr_list_lock, | |
349 | &netdev_addr_lock_key[i], | |
350 | netdev_lock_name[i]); | |
351 | } | |
723e98b7 | 352 | #else |
cf508b12 DM |
353 | static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock, |
354 | unsigned short dev_type) | |
355 | { | |
356 | } | |
357 | static inline void netdev_set_addr_lockdep_class(struct net_device *dev) | |
723e98b7 JP |
358 | { |
359 | } | |
360 | #endif | |
1da177e4 LT |
361 | |
362 | /******************************************************************************* | |
eb13da1a | 363 | * |
364 | * Protocol management and registration routines | |
365 | * | |
366 | *******************************************************************************/ | |
1da177e4 | 367 | |
1da177e4 | 368 | |
1da177e4 LT |
369 | /* |
370 | * Add a protocol ID to the list. Now that the input handler is | |
371 | * smarter we can dispense with all the messy stuff that used to be | |
372 | * here. | |
373 | * | |
374 | * BEWARE!!! Protocol handlers, mangling input packets, | |
375 | * MUST BE last in hash buckets and checking protocol handlers | |
376 | * MUST start from promiscuous ptype_all chain in net_bh. | |
377 | * It is true now, do not change it. | |
378 | * Explanation follows: if protocol handler, mangling packet, will | |
379 | * be the first on list, it is not able to sense, that packet | |
380 | * is cloned and should be copied-on-write, so that it will | |
381 | * change it and subsequent readers will get broken packet. | |
382 | * --ANK (980803) | |
383 | */ | |
384 | ||
c07b68e8 ED |
385 | static inline struct list_head *ptype_head(const struct packet_type *pt) |
386 | { | |
387 | if (pt->type == htons(ETH_P_ALL)) | |
7866a621 | 388 | return pt->dev ? &pt->dev->ptype_all : &ptype_all; |
c07b68e8 | 389 | else |
7866a621 SN |
390 | return pt->dev ? &pt->dev->ptype_specific : |
391 | &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK]; | |
c07b68e8 ED |
392 | } |
393 | ||
1da177e4 LT |
394 | /** |
395 | * dev_add_pack - add packet handler | |
396 | * @pt: packet type declaration | |
397 | * | |
398 | * Add a protocol handler to the networking stack. The passed &packet_type | |
399 | * is linked into kernel lists and may not be freed until it has been | |
400 | * removed from the kernel lists. | |
401 | * | |
4ec93edb | 402 | * This call does not sleep therefore it can not |
1da177e4 LT |
403 | * guarantee all CPU's that are in middle of receiving packets |
404 | * will see the new packet type (until the next received packet). | |
405 | */ | |
406 | ||
407 | void dev_add_pack(struct packet_type *pt) | |
408 | { | |
c07b68e8 | 409 | struct list_head *head = ptype_head(pt); |
1da177e4 | 410 | |
c07b68e8 ED |
411 | spin_lock(&ptype_lock); |
412 | list_add_rcu(&pt->list, head); | |
413 | spin_unlock(&ptype_lock); | |
1da177e4 | 414 | } |
d1b19dff | 415 | EXPORT_SYMBOL(dev_add_pack); |
1da177e4 | 416 | |
1da177e4 LT |
417 | /** |
418 | * __dev_remove_pack - remove packet handler | |
419 | * @pt: packet type declaration | |
420 | * | |
421 | * Remove a protocol handler that was previously added to the kernel | |
422 | * protocol handlers by dev_add_pack(). The passed &packet_type is removed | |
423 | * from the kernel lists and can be freed or reused once this function | |
4ec93edb | 424 | * returns. |
1da177e4 LT |
425 | * |
426 | * The packet type might still be in use by receivers | |
427 | * and must not be freed until after all the CPU's have gone | |
428 | * through a quiescent state. | |
429 | */ | |
430 | void __dev_remove_pack(struct packet_type *pt) | |
431 | { | |
c07b68e8 | 432 | struct list_head *head = ptype_head(pt); |
1da177e4 LT |
433 | struct packet_type *pt1; |
434 | ||
c07b68e8 | 435 | spin_lock(&ptype_lock); |
1da177e4 LT |
436 | |
437 | list_for_each_entry(pt1, head, list) { | |
438 | if (pt == pt1) { | |
439 | list_del_rcu(&pt->list); | |
440 | goto out; | |
441 | } | |
442 | } | |
443 | ||
7b6cd1ce | 444 | pr_warn("dev_remove_pack: %p not found\n", pt); |
1da177e4 | 445 | out: |
c07b68e8 | 446 | spin_unlock(&ptype_lock); |
1da177e4 | 447 | } |
d1b19dff ED |
448 | EXPORT_SYMBOL(__dev_remove_pack); |
449 | ||
1da177e4 LT |
450 | /** |
451 | * dev_remove_pack - remove packet handler | |
452 | * @pt: packet type declaration | |
453 | * | |
454 | * Remove a protocol handler that was previously added to the kernel | |
455 | * protocol handlers by dev_add_pack(). The passed &packet_type is removed | |
456 | * from the kernel lists and can be freed or reused once this function | |
457 | * returns. | |
458 | * | |
459 | * This call sleeps to guarantee that no CPU is looking at the packet | |
460 | * type after return. | |
461 | */ | |
462 | void dev_remove_pack(struct packet_type *pt) | |
463 | { | |
464 | __dev_remove_pack(pt); | |
4ec93edb | 465 | |
1da177e4 LT |
466 | synchronize_net(); |
467 | } | |
d1b19dff | 468 | EXPORT_SYMBOL(dev_remove_pack); |
1da177e4 | 469 | |
62532da9 VY |
470 | |
471 | /** | |
472 | * dev_add_offload - register offload handlers | |
473 | * @po: protocol offload declaration | |
474 | * | |
475 | * Add protocol offload handlers to the networking stack. The passed | |
476 | * &proto_offload is linked into kernel lists and may not be freed until | |
477 | * it has been removed from the kernel lists. | |
478 | * | |
479 | * This call does not sleep therefore it can not | |
480 | * guarantee all CPU's that are in middle of receiving packets | |
481 | * will see the new offload handlers (until the next received packet). | |
482 | */ | |
483 | void dev_add_offload(struct packet_offload *po) | |
484 | { | |
bdef7de4 | 485 | struct packet_offload *elem; |
62532da9 VY |
486 | |
487 | spin_lock(&offload_lock); | |
bdef7de4 DM |
488 | list_for_each_entry(elem, &offload_base, list) { |
489 | if (po->priority < elem->priority) | |
490 | break; | |
491 | } | |
492 | list_add_rcu(&po->list, elem->list.prev); | |
62532da9 VY |
493 | spin_unlock(&offload_lock); |
494 | } | |
495 | EXPORT_SYMBOL(dev_add_offload); | |
496 | ||
497 | /** | |
498 | * __dev_remove_offload - remove offload handler | |
499 | * @po: packet offload declaration | |
500 | * | |
501 | * Remove a protocol offload handler that was previously added to the | |
502 | * kernel offload handlers by dev_add_offload(). The passed &offload_type | |
503 | * is removed from the kernel lists and can be freed or reused once this | |
504 | * function returns. | |
505 | * | |
506 | * The packet type might still be in use by receivers | |
507 | * and must not be freed until after all the CPU's have gone | |
508 | * through a quiescent state. | |
509 | */ | |
1d143d9f | 510 | static void __dev_remove_offload(struct packet_offload *po) |
62532da9 VY |
511 | { |
512 | struct list_head *head = &offload_base; | |
513 | struct packet_offload *po1; | |
514 | ||
c53aa505 | 515 | spin_lock(&offload_lock); |
62532da9 VY |
516 | |
517 | list_for_each_entry(po1, head, list) { | |
518 | if (po == po1) { | |
519 | list_del_rcu(&po->list); | |
520 | goto out; | |
521 | } | |
522 | } | |
523 | ||
524 | pr_warn("dev_remove_offload: %p not found\n", po); | |
525 | out: | |
c53aa505 | 526 | spin_unlock(&offload_lock); |
62532da9 | 527 | } |
62532da9 VY |
528 | |
529 | /** | |
530 | * dev_remove_offload - remove packet offload handler | |
531 | * @po: packet offload declaration | |
532 | * | |
533 | * Remove a packet offload handler that was previously added to the kernel | |
534 | * offload handlers by dev_add_offload(). The passed &offload_type is | |
535 | * removed from the kernel lists and can be freed or reused once this | |
536 | * function returns. | |
537 | * | |
538 | * This call sleeps to guarantee that no CPU is looking at the packet | |
539 | * type after return. | |
540 | */ | |
541 | void dev_remove_offload(struct packet_offload *po) | |
542 | { | |
543 | __dev_remove_offload(po); | |
544 | ||
545 | synchronize_net(); | |
546 | } | |
547 | EXPORT_SYMBOL(dev_remove_offload); | |
548 | ||
1da177e4 | 549 | /****************************************************************************** |
eb13da1a | 550 | * |
551 | * Device Boot-time Settings Routines | |
552 | * | |
553 | ******************************************************************************/ | |
1da177e4 LT |
554 | |
555 | /* Boot time configuration table */ | |
556 | static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX]; | |
557 | ||
558 | /** | |
559 | * netdev_boot_setup_add - add new setup entry | |
560 | * @name: name of the device | |
561 | * @map: configured settings for the device | |
562 | * | |
563 | * Adds new setup entry to the dev_boot_setup list. The function | |
564 | * returns 0 on error and 1 on success. This is a generic routine to | |
565 | * all netdevices. | |
566 | */ | |
567 | static int netdev_boot_setup_add(char *name, struct ifmap *map) | |
568 | { | |
569 | struct netdev_boot_setup *s; | |
570 | int i; | |
571 | ||
572 | s = dev_boot_setup; | |
573 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) { | |
574 | if (s[i].name[0] == '\0' || s[i].name[0] == ' ') { | |
575 | memset(s[i].name, 0, sizeof(s[i].name)); | |
93b3cff9 | 576 | strlcpy(s[i].name, name, IFNAMSIZ); |
1da177e4 LT |
577 | memcpy(&s[i].map, map, sizeof(s[i].map)); |
578 | break; | |
579 | } | |
580 | } | |
581 | ||
582 | return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1; | |
583 | } | |
584 | ||
585 | /** | |
722c9a0c | 586 | * netdev_boot_setup_check - check boot time settings |
587 | * @dev: the netdevice | |
1da177e4 | 588 | * |
722c9a0c | 589 | * Check boot time settings for the device. |
590 | * The found settings are set for the device to be used | |
591 | * later in the device probing. | |
592 | * Returns 0 if no settings found, 1 if they are. | |
1da177e4 LT |
593 | */ |
594 | int netdev_boot_setup_check(struct net_device *dev) | |
595 | { | |
596 | struct netdev_boot_setup *s = dev_boot_setup; | |
597 | int i; | |
598 | ||
599 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) { | |
600 | if (s[i].name[0] != '\0' && s[i].name[0] != ' ' && | |
93b3cff9 | 601 | !strcmp(dev->name, s[i].name)) { |
722c9a0c | 602 | dev->irq = s[i].map.irq; |
603 | dev->base_addr = s[i].map.base_addr; | |
604 | dev->mem_start = s[i].map.mem_start; | |
605 | dev->mem_end = s[i].map.mem_end; | |
1da177e4 LT |
606 | return 1; |
607 | } | |
608 | } | |
609 | return 0; | |
610 | } | |
d1b19dff | 611 | EXPORT_SYMBOL(netdev_boot_setup_check); |
1da177e4 LT |
612 | |
613 | ||
614 | /** | |
722c9a0c | 615 | * netdev_boot_base - get address from boot time settings |
616 | * @prefix: prefix for network device | |
617 | * @unit: id for network device | |
618 | * | |
619 | * Check boot time settings for the base address of device. | |
620 | * The found settings are set for the device to be used | |
621 | * later in the device probing. | |
622 | * Returns 0 if no settings found. | |
1da177e4 LT |
623 | */ |
624 | unsigned long netdev_boot_base(const char *prefix, int unit) | |
625 | { | |
626 | const struct netdev_boot_setup *s = dev_boot_setup; | |
627 | char name[IFNAMSIZ]; | |
628 | int i; | |
629 | ||
630 | sprintf(name, "%s%d", prefix, unit); | |
631 | ||
632 | /* | |
633 | * If device already registered then return base of 1 | |
634 | * to indicate not to probe for this interface | |
635 | */ | |
881d966b | 636 | if (__dev_get_by_name(&init_net, name)) |
1da177e4 LT |
637 | return 1; |
638 | ||
639 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) | |
640 | if (!strcmp(name, s[i].name)) | |
641 | return s[i].map.base_addr; | |
642 | return 0; | |
643 | } | |
644 | ||
645 | /* | |
646 | * Saves at boot time configured settings for any netdevice. | |
647 | */ | |
648 | int __init netdev_boot_setup(char *str) | |
649 | { | |
650 | int ints[5]; | |
651 | struct ifmap map; | |
652 | ||
653 | str = get_options(str, ARRAY_SIZE(ints), ints); | |
654 | if (!str || !*str) | |
655 | return 0; | |
656 | ||
657 | /* Save settings */ | |
658 | memset(&map, 0, sizeof(map)); | |
659 | if (ints[0] > 0) | |
660 | map.irq = ints[1]; | |
661 | if (ints[0] > 1) | |
662 | map.base_addr = ints[2]; | |
663 | if (ints[0] > 2) | |
664 | map.mem_start = ints[3]; | |
665 | if (ints[0] > 3) | |
666 | map.mem_end = ints[4]; | |
667 | ||
668 | /* Add new entry to the list */ | |
669 | return netdev_boot_setup_add(str, &map); | |
670 | } | |
671 | ||
672 | __setup("netdev=", netdev_boot_setup); | |
673 | ||
674 | /******************************************************************************* | |
eb13da1a | 675 | * |
676 | * Device Interface Subroutines | |
677 | * | |
678 | *******************************************************************************/ | |
1da177e4 | 679 | |
a54acb3a ND |
680 | /** |
681 | * dev_get_iflink - get 'iflink' value of a interface | |
682 | * @dev: targeted interface | |
683 | * | |
684 | * Indicates the ifindex the interface is linked to. | |
685 | * Physical interfaces have the same 'ifindex' and 'iflink' values. | |
686 | */ | |
687 | ||
688 | int dev_get_iflink(const struct net_device *dev) | |
689 | { | |
690 | if (dev->netdev_ops && dev->netdev_ops->ndo_get_iflink) | |
691 | return dev->netdev_ops->ndo_get_iflink(dev); | |
692 | ||
7a66bbc9 | 693 | return dev->ifindex; |
a54acb3a ND |
694 | } |
695 | EXPORT_SYMBOL(dev_get_iflink); | |
696 | ||
fc4099f1 PS |
697 | /** |
698 | * dev_fill_metadata_dst - Retrieve tunnel egress information. | |
699 | * @dev: targeted interface | |
700 | * @skb: The packet. | |
701 | * | |
702 | * For better visibility of tunnel traffic OVS needs to retrieve | |
703 | * egress tunnel information for a packet. Following API allows | |
704 | * user to get this info. | |
705 | */ | |
706 | int dev_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) | |
707 | { | |
708 | struct ip_tunnel_info *info; | |
709 | ||
710 | if (!dev->netdev_ops || !dev->netdev_ops->ndo_fill_metadata_dst) | |
711 | return -EINVAL; | |
712 | ||
713 | info = skb_tunnel_info_unclone(skb); | |
714 | if (!info) | |
715 | return -ENOMEM; | |
716 | if (unlikely(!(info->mode & IP_TUNNEL_INFO_TX))) | |
717 | return -EINVAL; | |
718 | ||
719 | return dev->netdev_ops->ndo_fill_metadata_dst(dev, skb); | |
720 | } | |
721 | EXPORT_SYMBOL_GPL(dev_fill_metadata_dst); | |
722 | ||
1da177e4 LT |
723 | /** |
724 | * __dev_get_by_name - find a device by its name | |
c4ea43c5 | 725 | * @net: the applicable net namespace |
1da177e4 LT |
726 | * @name: name to find |
727 | * | |
728 | * Find an interface by name. Must be called under RTNL semaphore | |
729 | * or @dev_base_lock. If the name is found a pointer to the device | |
730 | * is returned. If the name is not found then %NULL is returned. The | |
731 | * reference counters are not incremented so the caller must be | |
732 | * careful with locks. | |
733 | */ | |
734 | ||
881d966b | 735 | struct net_device *__dev_get_by_name(struct net *net, const char *name) |
1da177e4 | 736 | { |
0bd8d536 ED |
737 | struct net_device *dev; |
738 | struct hlist_head *head = dev_name_hash(net, name); | |
1da177e4 | 739 | |
b67bfe0d | 740 | hlist_for_each_entry(dev, head, name_hlist) |
1da177e4 LT |
741 | if (!strncmp(dev->name, name, IFNAMSIZ)) |
742 | return dev; | |
0bd8d536 | 743 | |
1da177e4 LT |
744 | return NULL; |
745 | } | |
d1b19dff | 746 | EXPORT_SYMBOL(__dev_get_by_name); |
1da177e4 | 747 | |
72c9528b | 748 | /** |
722c9a0c | 749 | * dev_get_by_name_rcu - find a device by its name |
750 | * @net: the applicable net namespace | |
751 | * @name: name to find | |
752 | * | |
753 | * Find an interface by name. | |
754 | * If the name is found a pointer to the device is returned. | |
755 | * If the name is not found then %NULL is returned. | |
756 | * The reference counters are not incremented so the caller must be | |
757 | * careful with locks. The caller must hold RCU lock. | |
72c9528b ED |
758 | */ |
759 | ||
760 | struct net_device *dev_get_by_name_rcu(struct net *net, const char *name) | |
761 | { | |
72c9528b ED |
762 | struct net_device *dev; |
763 | struct hlist_head *head = dev_name_hash(net, name); | |
764 | ||
b67bfe0d | 765 | hlist_for_each_entry_rcu(dev, head, name_hlist) |
72c9528b ED |
766 | if (!strncmp(dev->name, name, IFNAMSIZ)) |
767 | return dev; | |
768 | ||
769 | return NULL; | |
770 | } | |
771 | EXPORT_SYMBOL(dev_get_by_name_rcu); | |
772 | ||
1da177e4 LT |
773 | /** |
774 | * dev_get_by_name - find a device by its name | |
c4ea43c5 | 775 | * @net: the applicable net namespace |
1da177e4 LT |
776 | * @name: name to find |
777 | * | |
778 | * Find an interface by name. This can be called from any | |
779 | * context and does its own locking. The returned handle has | |
780 | * the usage count incremented and the caller must use dev_put() to | |
781 | * release it when it is no longer needed. %NULL is returned if no | |
782 | * matching device is found. | |
783 | */ | |
784 | ||
881d966b | 785 | struct net_device *dev_get_by_name(struct net *net, const char *name) |
1da177e4 LT |
786 | { |
787 | struct net_device *dev; | |
788 | ||
72c9528b ED |
789 | rcu_read_lock(); |
790 | dev = dev_get_by_name_rcu(net, name); | |
1da177e4 LT |
791 | if (dev) |
792 | dev_hold(dev); | |
72c9528b | 793 | rcu_read_unlock(); |
1da177e4 LT |
794 | return dev; |
795 | } | |
d1b19dff | 796 | EXPORT_SYMBOL(dev_get_by_name); |
1da177e4 LT |
797 | |
798 | /** | |
799 | * __dev_get_by_index - find a device by its ifindex | |
c4ea43c5 | 800 | * @net: the applicable net namespace |
1da177e4 LT |
801 | * @ifindex: index of device |
802 | * | |
803 | * Search for an interface by index. Returns %NULL if the device | |
804 | * is not found or a pointer to the device. The device has not | |
805 | * had its reference counter increased so the caller must be careful | |
806 | * about locking. The caller must hold either the RTNL semaphore | |
807 | * or @dev_base_lock. | |
808 | */ | |
809 | ||
881d966b | 810 | struct net_device *__dev_get_by_index(struct net *net, int ifindex) |
1da177e4 | 811 | { |
0bd8d536 ED |
812 | struct net_device *dev; |
813 | struct hlist_head *head = dev_index_hash(net, ifindex); | |
1da177e4 | 814 | |
b67bfe0d | 815 | hlist_for_each_entry(dev, head, index_hlist) |
1da177e4 LT |
816 | if (dev->ifindex == ifindex) |
817 | return dev; | |
0bd8d536 | 818 | |
1da177e4 LT |
819 | return NULL; |
820 | } | |
d1b19dff | 821 | EXPORT_SYMBOL(__dev_get_by_index); |
1da177e4 | 822 | |
fb699dfd ED |
823 | /** |
824 | * dev_get_by_index_rcu - find a device by its ifindex | |
825 | * @net: the applicable net namespace | |
826 | * @ifindex: index of device | |
827 | * | |
828 | * Search for an interface by index. Returns %NULL if the device | |
829 | * is not found or a pointer to the device. The device has not | |
830 | * had its reference counter increased so the caller must be careful | |
831 | * about locking. The caller must hold RCU lock. | |
832 | */ | |
833 | ||
834 | struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex) | |
835 | { | |
fb699dfd ED |
836 | struct net_device *dev; |
837 | struct hlist_head *head = dev_index_hash(net, ifindex); | |
838 | ||
b67bfe0d | 839 | hlist_for_each_entry_rcu(dev, head, index_hlist) |
fb699dfd ED |
840 | if (dev->ifindex == ifindex) |
841 | return dev; | |
842 | ||
843 | return NULL; | |
844 | } | |
845 | EXPORT_SYMBOL(dev_get_by_index_rcu); | |
846 | ||
1da177e4 LT |
847 | |
848 | /** | |
849 | * dev_get_by_index - find a device by its ifindex | |
c4ea43c5 | 850 | * @net: the applicable net namespace |
1da177e4 LT |
851 | * @ifindex: index of device |
852 | * | |
853 | * Search for an interface by index. Returns NULL if the device | |
854 | * is not found or a pointer to the device. The device returned has | |
855 | * had a reference added and the pointer is safe until the user calls | |
856 | * dev_put to indicate they have finished with it. | |
857 | */ | |
858 | ||
881d966b | 859 | struct net_device *dev_get_by_index(struct net *net, int ifindex) |
1da177e4 LT |
860 | { |
861 | struct net_device *dev; | |
862 | ||
fb699dfd ED |
863 | rcu_read_lock(); |
864 | dev = dev_get_by_index_rcu(net, ifindex); | |
1da177e4 LT |
865 | if (dev) |
866 | dev_hold(dev); | |
fb699dfd | 867 | rcu_read_unlock(); |
1da177e4 LT |
868 | return dev; |
869 | } | |
d1b19dff | 870 | EXPORT_SYMBOL(dev_get_by_index); |
1da177e4 | 871 | |
90b602f8 ML |
872 | /** |
873 | * dev_get_by_napi_id - find a device by napi_id | |
874 | * @napi_id: ID of the NAPI struct | |
875 | * | |
876 | * Search for an interface by NAPI ID. Returns %NULL if the device | |
877 | * is not found or a pointer to the device. The device has not had | |
878 | * its reference counter increased so the caller must be careful | |
879 | * about locking. The caller must hold RCU lock. | |
880 | */ | |
881 | ||
882 | struct net_device *dev_get_by_napi_id(unsigned int napi_id) | |
883 | { | |
884 | struct napi_struct *napi; | |
885 | ||
886 | WARN_ON_ONCE(!rcu_read_lock_held()); | |
887 | ||
888 | if (napi_id < MIN_NAPI_ID) | |
889 | return NULL; | |
890 | ||
891 | napi = napi_by_id(napi_id); | |
892 | ||
893 | return napi ? napi->dev : NULL; | |
894 | } | |
895 | EXPORT_SYMBOL(dev_get_by_napi_id); | |
896 | ||
5dbe7c17 NS |
897 | /** |
898 | * netdev_get_name - get a netdevice name, knowing its ifindex. | |
899 | * @net: network namespace | |
900 | * @name: a pointer to the buffer where the name will be stored. | |
901 | * @ifindex: the ifindex of the interface to get the name from. | |
902 | * | |
903 | * The use of raw_seqcount_begin() and cond_resched() before | |
904 | * retrying is required as we want to give the writers a chance | |
905 | * to complete when CONFIG_PREEMPT is not set. | |
906 | */ | |
907 | int netdev_get_name(struct net *net, char *name, int ifindex) | |
908 | { | |
909 | struct net_device *dev; | |
910 | unsigned int seq; | |
911 | ||
912 | retry: | |
913 | seq = raw_seqcount_begin(&devnet_rename_seq); | |
914 | rcu_read_lock(); | |
915 | dev = dev_get_by_index_rcu(net, ifindex); | |
916 | if (!dev) { | |
917 | rcu_read_unlock(); | |
918 | return -ENODEV; | |
919 | } | |
920 | ||
921 | strcpy(name, dev->name); | |
922 | rcu_read_unlock(); | |
923 | if (read_seqcount_retry(&devnet_rename_seq, seq)) { | |
924 | cond_resched(); | |
925 | goto retry; | |
926 | } | |
927 | ||
928 | return 0; | |
929 | } | |
930 | ||
1da177e4 | 931 | /** |
941666c2 | 932 | * dev_getbyhwaddr_rcu - find a device by its hardware address |
c4ea43c5 | 933 | * @net: the applicable net namespace |
1da177e4 LT |
934 | * @type: media type of device |
935 | * @ha: hardware address | |
936 | * | |
937 | * Search for an interface by MAC address. Returns NULL if the device | |
c506653d ED |
938 | * is not found or a pointer to the device. |
939 | * The caller must hold RCU or RTNL. | |
941666c2 | 940 | * The returned device has not had its ref count increased |
1da177e4 LT |
941 | * and the caller must therefore be careful about locking |
942 | * | |
1da177e4 LT |
943 | */ |
944 | ||
941666c2 ED |
945 | struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type, |
946 | const char *ha) | |
1da177e4 LT |
947 | { |
948 | struct net_device *dev; | |
949 | ||
941666c2 | 950 | for_each_netdev_rcu(net, dev) |
1da177e4 LT |
951 | if (dev->type == type && |
952 | !memcmp(dev->dev_addr, ha, dev->addr_len)) | |
7562f876 PE |
953 | return dev; |
954 | ||
955 | return NULL; | |
1da177e4 | 956 | } |
941666c2 | 957 | EXPORT_SYMBOL(dev_getbyhwaddr_rcu); |
cf309e3f | 958 | |
881d966b | 959 | struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type) |
1da177e4 LT |
960 | { |
961 | struct net_device *dev; | |
962 | ||
4e9cac2b | 963 | ASSERT_RTNL(); |
881d966b | 964 | for_each_netdev(net, dev) |
4e9cac2b | 965 | if (dev->type == type) |
7562f876 PE |
966 | return dev; |
967 | ||
968 | return NULL; | |
4e9cac2b | 969 | } |
4e9cac2b PM |
970 | EXPORT_SYMBOL(__dev_getfirstbyhwtype); |
971 | ||
881d966b | 972 | struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type) |
4e9cac2b | 973 | { |
99fe3c39 | 974 | struct net_device *dev, *ret = NULL; |
4e9cac2b | 975 | |
99fe3c39 ED |
976 | rcu_read_lock(); |
977 | for_each_netdev_rcu(net, dev) | |
978 | if (dev->type == type) { | |
979 | dev_hold(dev); | |
980 | ret = dev; | |
981 | break; | |
982 | } | |
983 | rcu_read_unlock(); | |
984 | return ret; | |
1da177e4 | 985 | } |
1da177e4 LT |
986 | EXPORT_SYMBOL(dev_getfirstbyhwtype); |
987 | ||
988 | /** | |
6c555490 | 989 | * __dev_get_by_flags - find any device with given flags |
c4ea43c5 | 990 | * @net: the applicable net namespace |
1da177e4 LT |
991 | * @if_flags: IFF_* values |
992 | * @mask: bitmask of bits in if_flags to check | |
993 | * | |
994 | * Search for any interface with the given flags. Returns NULL if a device | |
bb69ae04 | 995 | * is not found or a pointer to the device. Must be called inside |
6c555490 | 996 | * rtnl_lock(), and result refcount is unchanged. |
1da177e4 LT |
997 | */ |
998 | ||
6c555490 WC |
999 | struct net_device *__dev_get_by_flags(struct net *net, unsigned short if_flags, |
1000 | unsigned short mask) | |
1da177e4 | 1001 | { |
7562f876 | 1002 | struct net_device *dev, *ret; |
1da177e4 | 1003 | |
6c555490 WC |
1004 | ASSERT_RTNL(); |
1005 | ||
7562f876 | 1006 | ret = NULL; |
6c555490 | 1007 | for_each_netdev(net, dev) { |
1da177e4 | 1008 | if (((dev->flags ^ if_flags) & mask) == 0) { |
7562f876 | 1009 | ret = dev; |
1da177e4 LT |
1010 | break; |
1011 | } | |
1012 | } | |
7562f876 | 1013 | return ret; |
1da177e4 | 1014 | } |
6c555490 | 1015 | EXPORT_SYMBOL(__dev_get_by_flags); |
1da177e4 LT |
1016 | |
1017 | /** | |
1018 | * dev_valid_name - check if name is okay for network device | |
1019 | * @name: name string | |
1020 | * | |
1021 | * Network device names need to be valid file names to | |
c7fa9d18 DM |
1022 | * to allow sysfs to work. We also disallow any kind of |
1023 | * whitespace. | |
1da177e4 | 1024 | */ |
95f050bf | 1025 | bool dev_valid_name(const char *name) |
1da177e4 | 1026 | { |
c7fa9d18 | 1027 | if (*name == '\0') |
95f050bf | 1028 | return false; |
a9d48205 | 1029 | if (strnlen(name, IFNAMSIZ) == IFNAMSIZ) |
95f050bf | 1030 | return false; |
c7fa9d18 | 1031 | if (!strcmp(name, ".") || !strcmp(name, "..")) |
95f050bf | 1032 | return false; |
c7fa9d18 DM |
1033 | |
1034 | while (*name) { | |
a4176a93 | 1035 | if (*name == '/' || *name == ':' || isspace(*name)) |
95f050bf | 1036 | return false; |
c7fa9d18 DM |
1037 | name++; |
1038 | } | |
95f050bf | 1039 | return true; |
1da177e4 | 1040 | } |
d1b19dff | 1041 | EXPORT_SYMBOL(dev_valid_name); |
1da177e4 LT |
1042 | |
1043 | /** | |
b267b179 EB |
1044 | * __dev_alloc_name - allocate a name for a device |
1045 | * @net: network namespace to allocate the device name in | |
1da177e4 | 1046 | * @name: name format string |
b267b179 | 1047 | * @buf: scratch buffer and result name string |
1da177e4 LT |
1048 | * |
1049 | * Passed a format string - eg "lt%d" it will try and find a suitable | |
3041a069 SH |
1050 | * id. It scans list of devices to build up a free map, then chooses |
1051 | * the first empty slot. The caller must hold the dev_base or rtnl lock | |
1052 | * while allocating the name and adding the device in order to avoid | |
1053 | * duplicates. | |
1054 | * Limited to bits_per_byte * page size devices (ie 32K on most platforms). | |
1055 | * Returns the number of the unit assigned or a negative errno code. | |
1da177e4 LT |
1056 | */ |
1057 | ||
b267b179 | 1058 | static int __dev_alloc_name(struct net *net, const char *name, char *buf) |
1da177e4 LT |
1059 | { |
1060 | int i = 0; | |
1da177e4 LT |
1061 | const char *p; |
1062 | const int max_netdevices = 8*PAGE_SIZE; | |
cfcabdcc | 1063 | unsigned long *inuse; |
1da177e4 LT |
1064 | struct net_device *d; |
1065 | ||
93809105 RV |
1066 | if (!dev_valid_name(name)) |
1067 | return -EINVAL; | |
1068 | ||
51f299dd | 1069 | p = strchr(name, '%'); |
1da177e4 LT |
1070 | if (p) { |
1071 | /* | |
1072 | * Verify the string as this thing may have come from | |
1073 | * the user. There must be either one "%d" and no other "%" | |
1074 | * characters. | |
1075 | */ | |
1076 | if (p[1] != 'd' || strchr(p + 2, '%')) | |
1077 | return -EINVAL; | |
1078 | ||
1079 | /* Use one page as a bit array of possible slots */ | |
cfcabdcc | 1080 | inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC); |
1da177e4 LT |
1081 | if (!inuse) |
1082 | return -ENOMEM; | |
1083 | ||
881d966b | 1084 | for_each_netdev(net, d) { |
1da177e4 LT |
1085 | if (!sscanf(d->name, name, &i)) |
1086 | continue; | |
1087 | if (i < 0 || i >= max_netdevices) | |
1088 | continue; | |
1089 | ||
1090 | /* avoid cases where sscanf is not exact inverse of printf */ | |
b267b179 | 1091 | snprintf(buf, IFNAMSIZ, name, i); |
1da177e4 LT |
1092 | if (!strncmp(buf, d->name, IFNAMSIZ)) |
1093 | set_bit(i, inuse); | |
1094 | } | |
1095 | ||
1096 | i = find_first_zero_bit(inuse, max_netdevices); | |
1097 | free_page((unsigned long) inuse); | |
1098 | } | |
1099 | ||
6224abda | 1100 | snprintf(buf, IFNAMSIZ, name, i); |
b267b179 | 1101 | if (!__dev_get_by_name(net, buf)) |
1da177e4 | 1102 | return i; |
1da177e4 LT |
1103 | |
1104 | /* It is possible to run out of possible slots | |
1105 | * when the name is long and there isn't enough space left | |
1106 | * for the digits, or if all bits are used. | |
1107 | */ | |
029b6d14 | 1108 | return -ENFILE; |
1da177e4 LT |
1109 | } |
1110 | ||
2c88b855 RV |
1111 | static int dev_alloc_name_ns(struct net *net, |
1112 | struct net_device *dev, | |
1113 | const char *name) | |
1114 | { | |
1115 | char buf[IFNAMSIZ]; | |
1116 | int ret; | |
1117 | ||
c46d7642 | 1118 | BUG_ON(!net); |
2c88b855 RV |
1119 | ret = __dev_alloc_name(net, name, buf); |
1120 | if (ret >= 0) | |
1121 | strlcpy(dev->name, buf, IFNAMSIZ); | |
1122 | return ret; | |
1da177e4 LT |
1123 | } |
1124 | ||
b267b179 EB |
1125 | /** |
1126 | * dev_alloc_name - allocate a name for a device | |
1127 | * @dev: device | |
1128 | * @name: name format string | |
1129 | * | |
1130 | * Passed a format string - eg "lt%d" it will try and find a suitable | |
1131 | * id. It scans list of devices to build up a free map, then chooses | |
1132 | * the first empty slot. The caller must hold the dev_base or rtnl lock | |
1133 | * while allocating the name and adding the device in order to avoid | |
1134 | * duplicates. | |
1135 | * Limited to bits_per_byte * page size devices (ie 32K on most platforms). | |
1136 | * Returns the number of the unit assigned or a negative errno code. | |
1137 | */ | |
1138 | ||
1139 | int dev_alloc_name(struct net_device *dev, const char *name) | |
1140 | { | |
c46d7642 | 1141 | return dev_alloc_name_ns(dev_net(dev), dev, name); |
b267b179 | 1142 | } |
d1b19dff | 1143 | EXPORT_SYMBOL(dev_alloc_name); |
b267b179 | 1144 | |
0ad646c8 CW |
1145 | int dev_get_valid_name(struct net *net, struct net_device *dev, |
1146 | const char *name) | |
828de4f6 | 1147 | { |
55a5ec9b DM |
1148 | BUG_ON(!net); |
1149 | ||
1150 | if (!dev_valid_name(name)) | |
1151 | return -EINVAL; | |
1152 | ||
1153 | if (strchr(name, '%')) | |
1154 | return dev_alloc_name_ns(net, dev, name); | |
1155 | else if (__dev_get_by_name(net, name)) | |
1156 | return -EEXIST; | |
1157 | else if (dev->name != name) | |
1158 | strlcpy(dev->name, name, IFNAMSIZ); | |
1159 | ||
1160 | return 0; | |
d9031024 | 1161 | } |
0ad646c8 | 1162 | EXPORT_SYMBOL(dev_get_valid_name); |
1da177e4 LT |
1163 | |
1164 | /** | |
1165 | * dev_change_name - change name of a device | |
1166 | * @dev: device | |
1167 | * @newname: name (or format string) must be at least IFNAMSIZ | |
1168 | * | |
1169 | * Change name of a device, can pass format strings "eth%d". | |
1170 | * for wildcarding. | |
1171 | */ | |
cf04a4c7 | 1172 | int dev_change_name(struct net_device *dev, const char *newname) |
1da177e4 | 1173 | { |
238fa362 | 1174 | unsigned char old_assign_type; |
fcc5a03a | 1175 | char oldname[IFNAMSIZ]; |
1da177e4 | 1176 | int err = 0; |
fcc5a03a | 1177 | int ret; |
881d966b | 1178 | struct net *net; |
1da177e4 LT |
1179 | |
1180 | ASSERT_RTNL(); | |
c346dca1 | 1181 | BUG_ON(!dev_net(dev)); |
1da177e4 | 1182 | |
c346dca1 | 1183 | net = dev_net(dev); |
1da177e4 LT |
1184 | if (dev->flags & IFF_UP) |
1185 | return -EBUSY; | |
1186 | ||
30e6c9fa | 1187 | write_seqcount_begin(&devnet_rename_seq); |
c91f6df2 BH |
1188 | |
1189 | if (strncmp(newname, dev->name, IFNAMSIZ) == 0) { | |
30e6c9fa | 1190 | write_seqcount_end(&devnet_rename_seq); |
c8d90dca | 1191 | return 0; |
c91f6df2 | 1192 | } |
c8d90dca | 1193 | |
fcc5a03a HX |
1194 | memcpy(oldname, dev->name, IFNAMSIZ); |
1195 | ||
828de4f6 | 1196 | err = dev_get_valid_name(net, dev, newname); |
c91f6df2 | 1197 | if (err < 0) { |
30e6c9fa | 1198 | write_seqcount_end(&devnet_rename_seq); |
d9031024 | 1199 | return err; |
c91f6df2 | 1200 | } |
1da177e4 | 1201 | |
6fe82a39 VF |
1202 | if (oldname[0] && !strchr(oldname, '%')) |
1203 | netdev_info(dev, "renamed from %s\n", oldname); | |
1204 | ||
238fa362 TG |
1205 | old_assign_type = dev->name_assign_type; |
1206 | dev->name_assign_type = NET_NAME_RENAMED; | |
1207 | ||
fcc5a03a | 1208 | rollback: |
a1b3f594 EB |
1209 | ret = device_rename(&dev->dev, dev->name); |
1210 | if (ret) { | |
1211 | memcpy(dev->name, oldname, IFNAMSIZ); | |
238fa362 | 1212 | dev->name_assign_type = old_assign_type; |
30e6c9fa | 1213 | write_seqcount_end(&devnet_rename_seq); |
a1b3f594 | 1214 | return ret; |
dcc99773 | 1215 | } |
7f988eab | 1216 | |
30e6c9fa | 1217 | write_seqcount_end(&devnet_rename_seq); |
c91f6df2 | 1218 | |
5bb025fa VF |
1219 | netdev_adjacent_rename_links(dev, oldname); |
1220 | ||
7f988eab | 1221 | write_lock_bh(&dev_base_lock); |
372b2312 | 1222 | hlist_del_rcu(&dev->name_hlist); |
72c9528b ED |
1223 | write_unlock_bh(&dev_base_lock); |
1224 | ||
1225 | synchronize_rcu(); | |
1226 | ||
1227 | write_lock_bh(&dev_base_lock); | |
1228 | hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name)); | |
7f988eab HX |
1229 | write_unlock_bh(&dev_base_lock); |
1230 | ||
056925ab | 1231 | ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev); |
fcc5a03a HX |
1232 | ret = notifier_to_errno(ret); |
1233 | ||
1234 | if (ret) { | |
91e9c07b ED |
1235 | /* err >= 0 after dev_alloc_name() or stores the first errno */ |
1236 | if (err >= 0) { | |
fcc5a03a | 1237 | err = ret; |
30e6c9fa | 1238 | write_seqcount_begin(&devnet_rename_seq); |
fcc5a03a | 1239 | memcpy(dev->name, oldname, IFNAMSIZ); |
5bb025fa | 1240 | memcpy(oldname, newname, IFNAMSIZ); |
238fa362 TG |
1241 | dev->name_assign_type = old_assign_type; |
1242 | old_assign_type = NET_NAME_RENAMED; | |
fcc5a03a | 1243 | goto rollback; |
91e9c07b | 1244 | } else { |
7b6cd1ce | 1245 | pr_err("%s: name change rollback failed: %d\n", |
91e9c07b | 1246 | dev->name, ret); |
fcc5a03a HX |
1247 | } |
1248 | } | |
1da177e4 LT |
1249 | |
1250 | return err; | |
1251 | } | |
1252 | ||
0b815a1a SH |
1253 | /** |
1254 | * dev_set_alias - change ifalias of a device | |
1255 | * @dev: device | |
1256 | * @alias: name up to IFALIASZ | |
f0db275a | 1257 | * @len: limit of bytes to copy from info |
0b815a1a SH |
1258 | * |
1259 | * Set ifalias for a device, | |
1260 | */ | |
1261 | int dev_set_alias(struct net_device *dev, const char *alias, size_t len) | |
1262 | { | |
6c557001 | 1263 | struct dev_ifalias *new_alias = NULL; |
0b815a1a SH |
1264 | |
1265 | if (len >= IFALIASZ) | |
1266 | return -EINVAL; | |
1267 | ||
6c557001 FW |
1268 | if (len) { |
1269 | new_alias = kmalloc(sizeof(*new_alias) + len + 1, GFP_KERNEL); | |
1270 | if (!new_alias) | |
1271 | return -ENOMEM; | |
1272 | ||
1273 | memcpy(new_alias->ifalias, alias, len); | |
1274 | new_alias->ifalias[len] = 0; | |
96ca4a2c OH |
1275 | } |
1276 | ||
6c557001 FW |
1277 | mutex_lock(&ifalias_mutex); |
1278 | rcu_swap_protected(dev->ifalias, new_alias, | |
1279 | mutex_is_locked(&ifalias_mutex)); | |
1280 | mutex_unlock(&ifalias_mutex); | |
1281 | ||
1282 | if (new_alias) | |
1283 | kfree_rcu(new_alias, rcuhead); | |
0b815a1a | 1284 | |
0b815a1a SH |
1285 | return len; |
1286 | } | |
0fe554a4 | 1287 | EXPORT_SYMBOL(dev_set_alias); |
0b815a1a | 1288 | |
6c557001 FW |
1289 | /** |
1290 | * dev_get_alias - get ifalias of a device | |
1291 | * @dev: device | |
20e88320 | 1292 | * @name: buffer to store name of ifalias |
6c557001 FW |
1293 | * @len: size of buffer |
1294 | * | |
1295 | * get ifalias for a device. Caller must make sure dev cannot go | |
1296 | * away, e.g. rcu read lock or own a reference count to device. | |
1297 | */ | |
1298 | int dev_get_alias(const struct net_device *dev, char *name, size_t len) | |
1299 | { | |
1300 | const struct dev_ifalias *alias; | |
1301 | int ret = 0; | |
1302 | ||
1303 | rcu_read_lock(); | |
1304 | alias = rcu_dereference(dev->ifalias); | |
1305 | if (alias) | |
1306 | ret = snprintf(name, len, "%s", alias->ifalias); | |
1307 | rcu_read_unlock(); | |
1308 | ||
1309 | return ret; | |
1310 | } | |
0b815a1a | 1311 | |
d8a33ac4 | 1312 | /** |
3041a069 | 1313 | * netdev_features_change - device changes features |
d8a33ac4 SH |
1314 | * @dev: device to cause notification |
1315 | * | |
1316 | * Called to indicate a device has changed features. | |
1317 | */ | |
1318 | void netdev_features_change(struct net_device *dev) | |
1319 | { | |
056925ab | 1320 | call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev); |
d8a33ac4 SH |
1321 | } |
1322 | EXPORT_SYMBOL(netdev_features_change); | |
1323 | ||
1da177e4 LT |
1324 | /** |
1325 | * netdev_state_change - device changes state | |
1326 | * @dev: device to cause notification | |
1327 | * | |
1328 | * Called to indicate a device has changed state. This function calls | |
1329 | * the notifier chains for netdev_chain and sends a NEWLINK message | |
1330 | * to the routing socket. | |
1331 | */ | |
1332 | void netdev_state_change(struct net_device *dev) | |
1333 | { | |
1334 | if (dev->flags & IFF_UP) { | |
51d0c047 DA |
1335 | struct netdev_notifier_change_info change_info = { |
1336 | .info.dev = dev, | |
1337 | }; | |
54951194 | 1338 | |
51d0c047 | 1339 | call_netdevice_notifiers_info(NETDEV_CHANGE, |
54951194 | 1340 | &change_info.info); |
7f294054 | 1341 | rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL); |
1da177e4 LT |
1342 | } |
1343 | } | |
d1b19dff | 1344 | EXPORT_SYMBOL(netdev_state_change); |
1da177e4 | 1345 | |
ee89bab1 | 1346 | /** |
722c9a0c | 1347 | * netdev_notify_peers - notify network peers about existence of @dev |
1348 | * @dev: network device | |
ee89bab1 AW |
1349 | * |
1350 | * Generate traffic such that interested network peers are aware of | |
1351 | * @dev, such as by generating a gratuitous ARP. This may be used when | |
1352 | * a device wants to inform the rest of the network about some sort of | |
1353 | * reconfiguration such as a failover event or virtual machine | |
1354 | * migration. | |
1355 | */ | |
1356 | void netdev_notify_peers(struct net_device *dev) | |
c1da4ac7 | 1357 | { |
ee89bab1 AW |
1358 | rtnl_lock(); |
1359 | call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, dev); | |
37c343b4 | 1360 | call_netdevice_notifiers(NETDEV_RESEND_IGMP, dev); |
ee89bab1 | 1361 | rtnl_unlock(); |
c1da4ac7 | 1362 | } |
ee89bab1 | 1363 | EXPORT_SYMBOL(netdev_notify_peers); |
c1da4ac7 | 1364 | |
bd380811 | 1365 | static int __dev_open(struct net_device *dev) |
1da177e4 | 1366 | { |
d314774c | 1367 | const struct net_device_ops *ops = dev->netdev_ops; |
3b8bcfd5 | 1368 | int ret; |
1da177e4 | 1369 | |
e46b66bc BH |
1370 | ASSERT_RTNL(); |
1371 | ||
1da177e4 LT |
1372 | if (!netif_device_present(dev)) |
1373 | return -ENODEV; | |
1374 | ||
ca99ca14 NH |
1375 | /* Block netpoll from trying to do any rx path servicing. |
1376 | * If we don't do this there is a chance ndo_poll_controller | |
1377 | * or ndo_poll may be running while we open the device | |
1378 | */ | |
66b5552f | 1379 | netpoll_poll_disable(dev); |
ca99ca14 | 1380 | |
3b8bcfd5 JB |
1381 | ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev); |
1382 | ret = notifier_to_errno(ret); | |
1383 | if (ret) | |
1384 | return ret; | |
1385 | ||
1da177e4 | 1386 | set_bit(__LINK_STATE_START, &dev->state); |
bada339b | 1387 | |
d314774c SH |
1388 | if (ops->ndo_validate_addr) |
1389 | ret = ops->ndo_validate_addr(dev); | |
bada339b | 1390 | |
d314774c SH |
1391 | if (!ret && ops->ndo_open) |
1392 | ret = ops->ndo_open(dev); | |
1da177e4 | 1393 | |
66b5552f | 1394 | netpoll_poll_enable(dev); |
ca99ca14 | 1395 | |
bada339b JG |
1396 | if (ret) |
1397 | clear_bit(__LINK_STATE_START, &dev->state); | |
1398 | else { | |
1da177e4 | 1399 | dev->flags |= IFF_UP; |
4417da66 | 1400 | dev_set_rx_mode(dev); |
1da177e4 | 1401 | dev_activate(dev); |
7bf23575 | 1402 | add_device_randomness(dev->dev_addr, dev->addr_len); |
1da177e4 | 1403 | } |
bada339b | 1404 | |
1da177e4 LT |
1405 | return ret; |
1406 | } | |
1407 | ||
1408 | /** | |
bd380811 PM |
1409 | * dev_open - prepare an interface for use. |
1410 | * @dev: device to open | |
1da177e4 | 1411 | * |
bd380811 PM |
1412 | * Takes a device from down to up state. The device's private open |
1413 | * function is invoked and then the multicast lists are loaded. Finally | |
1414 | * the device is moved into the up state and a %NETDEV_UP message is | |
1415 | * sent to the netdev notifier chain. | |
1416 | * | |
1417 | * Calling this function on an active interface is a nop. On a failure | |
1418 | * a negative errno code is returned. | |
1da177e4 | 1419 | */ |
bd380811 PM |
1420 | int dev_open(struct net_device *dev) |
1421 | { | |
1422 | int ret; | |
1423 | ||
bd380811 PM |
1424 | if (dev->flags & IFF_UP) |
1425 | return 0; | |
1426 | ||
bd380811 PM |
1427 | ret = __dev_open(dev); |
1428 | if (ret < 0) | |
1429 | return ret; | |
1430 | ||
7f294054 | 1431 | rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING, GFP_KERNEL); |
bd380811 PM |
1432 | call_netdevice_notifiers(NETDEV_UP, dev); |
1433 | ||
1434 | return ret; | |
1435 | } | |
1436 | EXPORT_SYMBOL(dev_open); | |
1437 | ||
7051b88a | 1438 | static void __dev_close_many(struct list_head *head) |
1da177e4 | 1439 | { |
44345724 | 1440 | struct net_device *dev; |
e46b66bc | 1441 | |
bd380811 | 1442 | ASSERT_RTNL(); |
9d5010db DM |
1443 | might_sleep(); |
1444 | ||
5cde2829 | 1445 | list_for_each_entry(dev, head, close_list) { |
3f4df206 | 1446 | /* Temporarily disable netpoll until the interface is down */ |
66b5552f | 1447 | netpoll_poll_disable(dev); |
3f4df206 | 1448 | |
44345724 | 1449 | call_netdevice_notifiers(NETDEV_GOING_DOWN, dev); |
1da177e4 | 1450 | |
44345724 | 1451 | clear_bit(__LINK_STATE_START, &dev->state); |
1da177e4 | 1452 | |
44345724 OP |
1453 | /* Synchronize to scheduled poll. We cannot touch poll list, it |
1454 | * can be even on different cpu. So just clear netif_running(). | |
1455 | * | |
1456 | * dev->stop() will invoke napi_disable() on all of it's | |
1457 | * napi_struct instances on this device. | |
1458 | */ | |
4e857c58 | 1459 | smp_mb__after_atomic(); /* Commit netif_running(). */ |
44345724 | 1460 | } |
1da177e4 | 1461 | |
44345724 | 1462 | dev_deactivate_many(head); |
d8b2a4d2 | 1463 | |
5cde2829 | 1464 | list_for_each_entry(dev, head, close_list) { |
44345724 | 1465 | const struct net_device_ops *ops = dev->netdev_ops; |
1da177e4 | 1466 | |
44345724 OP |
1467 | /* |
1468 | * Call the device specific close. This cannot fail. | |
1469 | * Only if device is UP | |
1470 | * | |
1471 | * We allow it to be called even after a DETACH hot-plug | |
1472 | * event. | |
1473 | */ | |
1474 | if (ops->ndo_stop) | |
1475 | ops->ndo_stop(dev); | |
1476 | ||
44345724 | 1477 | dev->flags &= ~IFF_UP; |
66b5552f | 1478 | netpoll_poll_enable(dev); |
44345724 | 1479 | } |
44345724 OP |
1480 | } |
1481 | ||
7051b88a | 1482 | static void __dev_close(struct net_device *dev) |
44345724 OP |
1483 | { |
1484 | LIST_HEAD(single); | |
1485 | ||
5cde2829 | 1486 | list_add(&dev->close_list, &single); |
7051b88a | 1487 | __dev_close_many(&single); |
f87e6f47 | 1488 | list_del(&single); |
44345724 OP |
1489 | } |
1490 | ||
7051b88a | 1491 | void dev_close_many(struct list_head *head, bool unlink) |
44345724 OP |
1492 | { |
1493 | struct net_device *dev, *tmp; | |
1da177e4 | 1494 | |
5cde2829 EB |
1495 | /* Remove the devices that don't need to be closed */ |
1496 | list_for_each_entry_safe(dev, tmp, head, close_list) | |
44345724 | 1497 | if (!(dev->flags & IFF_UP)) |
5cde2829 | 1498 | list_del_init(&dev->close_list); |
44345724 OP |
1499 | |
1500 | __dev_close_many(head); | |
1da177e4 | 1501 | |
5cde2829 | 1502 | list_for_each_entry_safe(dev, tmp, head, close_list) { |
7f294054 | 1503 | rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING, GFP_KERNEL); |
44345724 | 1504 | call_netdevice_notifiers(NETDEV_DOWN, dev); |
99c4a26a DM |
1505 | if (unlink) |
1506 | list_del_init(&dev->close_list); | |
44345724 | 1507 | } |
bd380811 | 1508 | } |
99c4a26a | 1509 | EXPORT_SYMBOL(dev_close_many); |
bd380811 PM |
1510 | |
1511 | /** | |
1512 | * dev_close - shutdown an interface. | |
1513 | * @dev: device to shutdown | |
1514 | * | |
1515 | * This function moves an active device into down state. A | |
1516 | * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device | |
1517 | * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier | |
1518 | * chain. | |
1519 | */ | |
7051b88a | 1520 | void dev_close(struct net_device *dev) |
bd380811 | 1521 | { |
e14a5993 ED |
1522 | if (dev->flags & IFF_UP) { |
1523 | LIST_HEAD(single); | |
1da177e4 | 1524 | |
5cde2829 | 1525 | list_add(&dev->close_list, &single); |
99c4a26a | 1526 | dev_close_many(&single, true); |
e14a5993 ED |
1527 | list_del(&single); |
1528 | } | |
1da177e4 | 1529 | } |
d1b19dff | 1530 | EXPORT_SYMBOL(dev_close); |
1da177e4 LT |
1531 | |
1532 | ||
0187bdfb BH |
1533 | /** |
1534 | * dev_disable_lro - disable Large Receive Offload on a device | |
1535 | * @dev: device | |
1536 | * | |
1537 | * Disable Large Receive Offload (LRO) on a net device. Must be | |
1538 | * called under RTNL. This is needed if received packets may be | |
1539 | * forwarded to another interface. | |
1540 | */ | |
1541 | void dev_disable_lro(struct net_device *dev) | |
1542 | { | |
fbe168ba MK |
1543 | struct net_device *lower_dev; |
1544 | struct list_head *iter; | |
529d0489 | 1545 | |
bc5787c6 MM |
1546 | dev->wanted_features &= ~NETIF_F_LRO; |
1547 | netdev_update_features(dev); | |
27660515 | 1548 | |
22d5969f MM |
1549 | if (unlikely(dev->features & NETIF_F_LRO)) |
1550 | netdev_WARN(dev, "failed to disable LRO!\n"); | |
fbe168ba MK |
1551 | |
1552 | netdev_for_each_lower_dev(dev, lower_dev, iter) | |
1553 | dev_disable_lro(lower_dev); | |
0187bdfb BH |
1554 | } |
1555 | EXPORT_SYMBOL(dev_disable_lro); | |
1556 | ||
56f5aa77 MC |
1557 | /** |
1558 | * dev_disable_gro_hw - disable HW Generic Receive Offload on a device | |
1559 | * @dev: device | |
1560 | * | |
1561 | * Disable HW Generic Receive Offload (GRO_HW) on a net device. Must be | |
1562 | * called under RTNL. This is needed if Generic XDP is installed on | |
1563 | * the device. | |
1564 | */ | |
1565 | static void dev_disable_gro_hw(struct net_device *dev) | |
1566 | { | |
1567 | dev->wanted_features &= ~NETIF_F_GRO_HW; | |
1568 | netdev_update_features(dev); | |
1569 | ||
1570 | if (unlikely(dev->features & NETIF_F_GRO_HW)) | |
1571 | netdev_WARN(dev, "failed to disable GRO_HW!\n"); | |
1572 | } | |
1573 | ||
ede2762d KT |
1574 | const char *netdev_cmd_to_name(enum netdev_cmd cmd) |
1575 | { | |
1576 | #define N(val) \ | |
1577 | case NETDEV_##val: \ | |
1578 | return "NETDEV_" __stringify(val); | |
1579 | switch (cmd) { | |
1580 | N(UP) N(DOWN) N(REBOOT) N(CHANGE) N(REGISTER) N(UNREGISTER) | |
1581 | N(CHANGEMTU) N(CHANGEADDR) N(GOING_DOWN) N(CHANGENAME) N(FEAT_CHANGE) | |
1582 | N(BONDING_FAILOVER) N(PRE_UP) N(PRE_TYPE_CHANGE) N(POST_TYPE_CHANGE) | |
1583 | N(POST_INIT) N(RELEASE) N(NOTIFY_PEERS) N(JOIN) N(CHANGEUPPER) | |
1584 | N(RESEND_IGMP) N(PRECHANGEMTU) N(CHANGEINFODATA) N(BONDING_INFO) | |
1585 | N(PRECHANGEUPPER) N(CHANGELOWERSTATE) N(UDP_TUNNEL_PUSH_INFO) | |
1586 | N(UDP_TUNNEL_DROP_INFO) N(CHANGE_TX_QUEUE_LEN) | |
9daae9bd GP |
1587 | N(CVLAN_FILTER_PUSH_INFO) N(CVLAN_FILTER_DROP_INFO) |
1588 | N(SVLAN_FILTER_PUSH_INFO) N(SVLAN_FILTER_DROP_INFO) | |
3f5ecd8a | 1589 | } |
ede2762d KT |
1590 | #undef N |
1591 | return "UNKNOWN_NETDEV_EVENT"; | |
1592 | } | |
1593 | EXPORT_SYMBOL_GPL(netdev_cmd_to_name); | |
1594 | ||
351638e7 JP |
1595 | static int call_netdevice_notifier(struct notifier_block *nb, unsigned long val, |
1596 | struct net_device *dev) | |
1597 | { | |
51d0c047 DA |
1598 | struct netdev_notifier_info info = { |
1599 | .dev = dev, | |
1600 | }; | |
351638e7 | 1601 | |
351638e7 JP |
1602 | return nb->notifier_call(nb, val, &info); |
1603 | } | |
0187bdfb | 1604 | |
881d966b EB |
1605 | static int dev_boot_phase = 1; |
1606 | ||
1da177e4 | 1607 | /** |
722c9a0c | 1608 | * register_netdevice_notifier - register a network notifier block |
1609 | * @nb: notifier | |
1da177e4 | 1610 | * |
722c9a0c | 1611 | * Register a notifier to be called when network device events occur. |
1612 | * The notifier passed is linked into the kernel structures and must | |
1613 | * not be reused until it has been unregistered. A negative errno code | |
1614 | * is returned on a failure. | |
1da177e4 | 1615 | * |
722c9a0c | 1616 | * When registered all registration and up events are replayed |
1617 | * to the new notifier to allow device to have a race free | |
1618 | * view of the network device list. | |
1da177e4 LT |
1619 | */ |
1620 | ||
1621 | int register_netdevice_notifier(struct notifier_block *nb) | |
1622 | { | |
1623 | struct net_device *dev; | |
fcc5a03a | 1624 | struct net_device *last; |
881d966b | 1625 | struct net *net; |
1da177e4 LT |
1626 | int err; |
1627 | ||
328fbe74 KT |
1628 | /* Close race with setup_net() and cleanup_net() */ |
1629 | down_write(&pernet_ops_rwsem); | |
1da177e4 | 1630 | rtnl_lock(); |
f07d5b94 | 1631 | err = raw_notifier_chain_register(&netdev_chain, nb); |
fcc5a03a HX |
1632 | if (err) |
1633 | goto unlock; | |
881d966b EB |
1634 | if (dev_boot_phase) |
1635 | goto unlock; | |
1636 | for_each_net(net) { | |
1637 | for_each_netdev(net, dev) { | |
351638e7 | 1638 | err = call_netdevice_notifier(nb, NETDEV_REGISTER, dev); |
881d966b EB |
1639 | err = notifier_to_errno(err); |
1640 | if (err) | |
1641 | goto rollback; | |
1642 | ||
1643 | if (!(dev->flags & IFF_UP)) | |
1644 | continue; | |
1da177e4 | 1645 | |
351638e7 | 1646 | call_netdevice_notifier(nb, NETDEV_UP, dev); |
881d966b | 1647 | } |
1da177e4 | 1648 | } |
fcc5a03a HX |
1649 | |
1650 | unlock: | |
1da177e4 | 1651 | rtnl_unlock(); |
328fbe74 | 1652 | up_write(&pernet_ops_rwsem); |
1da177e4 | 1653 | return err; |
fcc5a03a HX |
1654 | |
1655 | rollback: | |
1656 | last = dev; | |
881d966b EB |
1657 | for_each_net(net) { |
1658 | for_each_netdev(net, dev) { | |
1659 | if (dev == last) | |
8f891489 | 1660 | goto outroll; |
fcc5a03a | 1661 | |
881d966b | 1662 | if (dev->flags & IFF_UP) { |
351638e7 JP |
1663 | call_netdevice_notifier(nb, NETDEV_GOING_DOWN, |
1664 | dev); | |
1665 | call_netdevice_notifier(nb, NETDEV_DOWN, dev); | |
881d966b | 1666 | } |
351638e7 | 1667 | call_netdevice_notifier(nb, NETDEV_UNREGISTER, dev); |
fcc5a03a | 1668 | } |
fcc5a03a | 1669 | } |
c67625a1 | 1670 | |
8f891489 | 1671 | outroll: |
c67625a1 | 1672 | raw_notifier_chain_unregister(&netdev_chain, nb); |
fcc5a03a | 1673 | goto unlock; |
1da177e4 | 1674 | } |
d1b19dff | 1675 | EXPORT_SYMBOL(register_netdevice_notifier); |
1da177e4 LT |
1676 | |
1677 | /** | |
722c9a0c | 1678 | * unregister_netdevice_notifier - unregister a network notifier block |
1679 | * @nb: notifier | |
1da177e4 | 1680 | * |
722c9a0c | 1681 | * Unregister a notifier previously registered by |
1682 | * register_netdevice_notifier(). The notifier is unlinked into the | |
1683 | * kernel structures and may then be reused. A negative errno code | |
1684 | * is returned on a failure. | |
7d3d43da | 1685 | * |
722c9a0c | 1686 | * After unregistering unregister and down device events are synthesized |
1687 | * for all devices on the device list to the removed notifier to remove | |
1688 | * the need for special case cleanup code. | |
1da177e4 LT |
1689 | */ |
1690 | ||
1691 | int unregister_netdevice_notifier(struct notifier_block *nb) | |
1692 | { | |
7d3d43da EB |
1693 | struct net_device *dev; |
1694 | struct net *net; | |
9f514950 HX |
1695 | int err; |
1696 | ||
328fbe74 KT |
1697 | /* Close race with setup_net() and cleanup_net() */ |
1698 | down_write(&pernet_ops_rwsem); | |
9f514950 | 1699 | rtnl_lock(); |
f07d5b94 | 1700 | err = raw_notifier_chain_unregister(&netdev_chain, nb); |
7d3d43da EB |
1701 | if (err) |
1702 | goto unlock; | |
1703 | ||
1704 | for_each_net(net) { | |
1705 | for_each_netdev(net, dev) { | |
1706 | if (dev->flags & IFF_UP) { | |
351638e7 JP |
1707 | call_netdevice_notifier(nb, NETDEV_GOING_DOWN, |
1708 | dev); | |
1709 | call_netdevice_notifier(nb, NETDEV_DOWN, dev); | |
7d3d43da | 1710 | } |
351638e7 | 1711 | call_netdevice_notifier(nb, NETDEV_UNREGISTER, dev); |
7d3d43da EB |
1712 | } |
1713 | } | |
1714 | unlock: | |
9f514950 | 1715 | rtnl_unlock(); |
328fbe74 | 1716 | up_write(&pernet_ops_rwsem); |
9f514950 | 1717 | return err; |
1da177e4 | 1718 | } |
d1b19dff | 1719 | EXPORT_SYMBOL(unregister_netdevice_notifier); |
1da177e4 | 1720 | |
351638e7 JP |
1721 | /** |
1722 | * call_netdevice_notifiers_info - call all network notifier blocks | |
1723 | * @val: value passed unmodified to notifier function | |
351638e7 JP |
1724 | * @info: notifier information data |
1725 | * | |
1726 | * Call all network notifier blocks. Parameters and return value | |
1727 | * are as for raw_notifier_call_chain(). | |
1728 | */ | |
1729 | ||
1d143d9f | 1730 | static int call_netdevice_notifiers_info(unsigned long val, |
1d143d9f | 1731 | struct netdev_notifier_info *info) |
351638e7 JP |
1732 | { |
1733 | ASSERT_RTNL(); | |
351638e7 JP |
1734 | return raw_notifier_call_chain(&netdev_chain, val, info); |
1735 | } | |
351638e7 | 1736 | |
1da177e4 LT |
1737 | /** |
1738 | * call_netdevice_notifiers - call all network notifier blocks | |
1739 | * @val: value passed unmodified to notifier function | |
c4ea43c5 | 1740 | * @dev: net_device pointer passed unmodified to notifier function |
1da177e4 LT |
1741 | * |
1742 | * Call all network notifier blocks. Parameters and return value | |
f07d5b94 | 1743 | * are as for raw_notifier_call_chain(). |
1da177e4 LT |
1744 | */ |
1745 | ||
ad7379d4 | 1746 | int call_netdevice_notifiers(unsigned long val, struct net_device *dev) |
1da177e4 | 1747 | { |
51d0c047 DA |
1748 | struct netdev_notifier_info info = { |
1749 | .dev = dev, | |
1750 | }; | |
351638e7 | 1751 | |
51d0c047 | 1752 | return call_netdevice_notifiers_info(val, &info); |
1da177e4 | 1753 | } |
edf947f1 | 1754 | EXPORT_SYMBOL(call_netdevice_notifiers); |
1da177e4 | 1755 | |
1cf51900 | 1756 | #ifdef CONFIG_NET_INGRESS |
aabf6772 | 1757 | static DEFINE_STATIC_KEY_FALSE(ingress_needed_key); |
4577139b DB |
1758 | |
1759 | void net_inc_ingress_queue(void) | |
1760 | { | |
aabf6772 | 1761 | static_branch_inc(&ingress_needed_key); |
4577139b DB |
1762 | } |
1763 | EXPORT_SYMBOL_GPL(net_inc_ingress_queue); | |
1764 | ||
1765 | void net_dec_ingress_queue(void) | |
1766 | { | |
aabf6772 | 1767 | static_branch_dec(&ingress_needed_key); |
4577139b DB |
1768 | } |
1769 | EXPORT_SYMBOL_GPL(net_dec_ingress_queue); | |
1770 | #endif | |
1771 | ||
1f211a1b | 1772 | #ifdef CONFIG_NET_EGRESS |
aabf6772 | 1773 | static DEFINE_STATIC_KEY_FALSE(egress_needed_key); |
1f211a1b DB |
1774 | |
1775 | void net_inc_egress_queue(void) | |
1776 | { | |
aabf6772 | 1777 | static_branch_inc(&egress_needed_key); |
1f211a1b DB |
1778 | } |
1779 | EXPORT_SYMBOL_GPL(net_inc_egress_queue); | |
1780 | ||
1781 | void net_dec_egress_queue(void) | |
1782 | { | |
aabf6772 | 1783 | static_branch_dec(&egress_needed_key); |
1f211a1b DB |
1784 | } |
1785 | EXPORT_SYMBOL_GPL(net_dec_egress_queue); | |
1786 | #endif | |
1787 | ||
39e83922 | 1788 | static DEFINE_STATIC_KEY_FALSE(netstamp_needed_key); |
b90e5794 | 1789 | #ifdef HAVE_JUMP_LABEL |
b90e5794 | 1790 | static atomic_t netstamp_needed_deferred; |
13baa00a | 1791 | static atomic_t netstamp_wanted; |
5fa8bbda | 1792 | static void netstamp_clear(struct work_struct *work) |
1da177e4 | 1793 | { |
b90e5794 | 1794 | int deferred = atomic_xchg(&netstamp_needed_deferred, 0); |
13baa00a | 1795 | int wanted; |
b90e5794 | 1796 | |
13baa00a ED |
1797 | wanted = atomic_add_return(deferred, &netstamp_wanted); |
1798 | if (wanted > 0) | |
39e83922 | 1799 | static_branch_enable(&netstamp_needed_key); |
13baa00a | 1800 | else |
39e83922 | 1801 | static_branch_disable(&netstamp_needed_key); |
5fa8bbda ED |
1802 | } |
1803 | static DECLARE_WORK(netstamp_work, netstamp_clear); | |
b90e5794 | 1804 | #endif |
5fa8bbda ED |
1805 | |
1806 | void net_enable_timestamp(void) | |
1807 | { | |
13baa00a ED |
1808 | #ifdef HAVE_JUMP_LABEL |
1809 | int wanted; | |
1810 | ||
1811 | while (1) { | |
1812 | wanted = atomic_read(&netstamp_wanted); | |
1813 | if (wanted <= 0) | |
1814 | break; | |
1815 | if (atomic_cmpxchg(&netstamp_wanted, wanted, wanted + 1) == wanted) | |
1816 | return; | |
1817 | } | |
1818 | atomic_inc(&netstamp_needed_deferred); | |
1819 | schedule_work(&netstamp_work); | |
1820 | #else | |
39e83922 | 1821 | static_branch_inc(&netstamp_needed_key); |
13baa00a | 1822 | #endif |
1da177e4 | 1823 | } |
d1b19dff | 1824 | EXPORT_SYMBOL(net_enable_timestamp); |
1da177e4 LT |
1825 | |
1826 | void net_disable_timestamp(void) | |
1827 | { | |
b90e5794 | 1828 | #ifdef HAVE_JUMP_LABEL |
13baa00a ED |
1829 | int wanted; |
1830 | ||
1831 | while (1) { | |
1832 | wanted = atomic_read(&netstamp_wanted); | |
1833 | if (wanted <= 1) | |
1834 | break; | |
1835 | if (atomic_cmpxchg(&netstamp_wanted, wanted, wanted - 1) == wanted) | |
1836 | return; | |
1837 | } | |
1838 | atomic_dec(&netstamp_needed_deferred); | |
5fa8bbda ED |
1839 | schedule_work(&netstamp_work); |
1840 | #else | |
39e83922 | 1841 | static_branch_dec(&netstamp_needed_key); |
5fa8bbda | 1842 | #endif |
1da177e4 | 1843 | } |
d1b19dff | 1844 | EXPORT_SYMBOL(net_disable_timestamp); |
1da177e4 | 1845 | |
3b098e2d | 1846 | static inline void net_timestamp_set(struct sk_buff *skb) |
1da177e4 | 1847 | { |
2456e855 | 1848 | skb->tstamp = 0; |
39e83922 | 1849 | if (static_branch_unlikely(&netstamp_needed_key)) |
a61bbcf2 | 1850 | __net_timestamp(skb); |
1da177e4 LT |
1851 | } |
1852 | ||
39e83922 DB |
1853 | #define net_timestamp_check(COND, SKB) \ |
1854 | if (static_branch_unlikely(&netstamp_needed_key)) { \ | |
1855 | if ((COND) && !(SKB)->tstamp) \ | |
1856 | __net_timestamp(SKB); \ | |
1857 | } \ | |
3b098e2d | 1858 | |
f4b05d27 | 1859 | bool is_skb_forwardable(const struct net_device *dev, const struct sk_buff *skb) |
79b569f0 DL |
1860 | { |
1861 | unsigned int len; | |
1862 | ||
1863 | if (!(dev->flags & IFF_UP)) | |
1864 | return false; | |
1865 | ||
1866 | len = dev->mtu + dev->hard_header_len + VLAN_HLEN; | |
1867 | if (skb->len <= len) | |
1868 | return true; | |
1869 | ||
1870 | /* if TSO is enabled, we don't care about the length as the packet | |
1871 | * could be forwarded without being segmented before | |
1872 | */ | |
1873 | if (skb_is_gso(skb)) | |
1874 | return true; | |
1875 | ||
1876 | return false; | |
1877 | } | |
1ee481fb | 1878 | EXPORT_SYMBOL_GPL(is_skb_forwardable); |
79b569f0 | 1879 | |
a0265d28 HX |
1880 | int __dev_forward_skb(struct net_device *dev, struct sk_buff *skb) |
1881 | { | |
4e3264d2 | 1882 | int ret = ____dev_forward_skb(dev, skb); |
a0265d28 | 1883 | |
4e3264d2 MKL |
1884 | if (likely(!ret)) { |
1885 | skb->protocol = eth_type_trans(skb, dev); | |
1886 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); | |
1887 | } | |
a0265d28 | 1888 | |
4e3264d2 | 1889 | return ret; |
a0265d28 HX |
1890 | } |
1891 | EXPORT_SYMBOL_GPL(__dev_forward_skb); | |
1892 | ||
44540960 AB |
1893 | /** |
1894 | * dev_forward_skb - loopback an skb to another netif | |
1895 | * | |
1896 | * @dev: destination network device | |
1897 | * @skb: buffer to forward | |
1898 | * | |
1899 | * return values: | |
1900 | * NET_RX_SUCCESS (no congestion) | |
6ec82562 | 1901 | * NET_RX_DROP (packet was dropped, but freed) |
44540960 AB |
1902 | * |
1903 | * dev_forward_skb can be used for injecting an skb from the | |
1904 | * start_xmit function of one device into the receive queue | |
1905 | * of another device. | |
1906 | * | |
1907 | * The receiving device may be in another namespace, so | |
1908 | * we have to clear all information in the skb that could | |
1909 | * impact namespace isolation. | |
1910 | */ | |
1911 | int dev_forward_skb(struct net_device *dev, struct sk_buff *skb) | |
1912 | { | |
a0265d28 | 1913 | return __dev_forward_skb(dev, skb) ?: netif_rx_internal(skb); |
44540960 AB |
1914 | } |
1915 | EXPORT_SYMBOL_GPL(dev_forward_skb); | |
1916 | ||
71d9dec2 CG |
1917 | static inline int deliver_skb(struct sk_buff *skb, |
1918 | struct packet_type *pt_prev, | |
1919 | struct net_device *orig_dev) | |
1920 | { | |
1f8b977a | 1921 | if (unlikely(skb_orphan_frags_rx(skb, GFP_ATOMIC))) |
1080e512 | 1922 | return -ENOMEM; |
63354797 | 1923 | refcount_inc(&skb->users); |
71d9dec2 CG |
1924 | return pt_prev->func(skb, skb->dev, pt_prev, orig_dev); |
1925 | } | |
1926 | ||
7866a621 SN |
1927 | static inline void deliver_ptype_list_skb(struct sk_buff *skb, |
1928 | struct packet_type **pt, | |
fbcb2170 JP |
1929 | struct net_device *orig_dev, |
1930 | __be16 type, | |
7866a621 SN |
1931 | struct list_head *ptype_list) |
1932 | { | |
1933 | struct packet_type *ptype, *pt_prev = *pt; | |
1934 | ||
1935 | list_for_each_entry_rcu(ptype, ptype_list, list) { | |
1936 | if (ptype->type != type) | |
1937 | continue; | |
1938 | if (pt_prev) | |
fbcb2170 | 1939 | deliver_skb(skb, pt_prev, orig_dev); |
7866a621 SN |
1940 | pt_prev = ptype; |
1941 | } | |
1942 | *pt = pt_prev; | |
1943 | } | |
1944 | ||
c0de08d0 EL |
1945 | static inline bool skb_loop_sk(struct packet_type *ptype, struct sk_buff *skb) |
1946 | { | |
a3d744e9 | 1947 | if (!ptype->af_packet_priv || !skb->sk) |
c0de08d0 EL |
1948 | return false; |
1949 | ||
1950 | if (ptype->id_match) | |
1951 | return ptype->id_match(ptype, skb->sk); | |
1952 | else if ((struct sock *)ptype->af_packet_priv == skb->sk) | |
1953 | return true; | |
1954 | ||
1955 | return false; | |
1956 | } | |
1957 | ||
1da177e4 LT |
1958 | /* |
1959 | * Support routine. Sends outgoing frames to any network | |
1960 | * taps currently in use. | |
1961 | */ | |
1962 | ||
74b20582 | 1963 | void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
1964 | { |
1965 | struct packet_type *ptype; | |
71d9dec2 CG |
1966 | struct sk_buff *skb2 = NULL; |
1967 | struct packet_type *pt_prev = NULL; | |
7866a621 | 1968 | struct list_head *ptype_list = &ptype_all; |
a61bbcf2 | 1969 | |
1da177e4 | 1970 | rcu_read_lock(); |
7866a621 SN |
1971 | again: |
1972 | list_for_each_entry_rcu(ptype, ptype_list, list) { | |
1da177e4 LT |
1973 | /* Never send packets back to the socket |
1974 | * they originated from - MvS (miquels@drinkel.ow.org) | |
1975 | */ | |
7866a621 SN |
1976 | if (skb_loop_sk(ptype, skb)) |
1977 | continue; | |
71d9dec2 | 1978 | |
7866a621 SN |
1979 | if (pt_prev) { |
1980 | deliver_skb(skb2, pt_prev, skb->dev); | |
1981 | pt_prev = ptype; | |
1982 | continue; | |
1983 | } | |
1da177e4 | 1984 | |
7866a621 SN |
1985 | /* need to clone skb, done only once */ |
1986 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1987 | if (!skb2) | |
1988 | goto out_unlock; | |
70978182 | 1989 | |
7866a621 | 1990 | net_timestamp_set(skb2); |
1da177e4 | 1991 | |
7866a621 SN |
1992 | /* skb->nh should be correctly |
1993 | * set by sender, so that the second statement is | |
1994 | * just protection against buggy protocols. | |
1995 | */ | |
1996 | skb_reset_mac_header(skb2); | |
1997 | ||
1998 | if (skb_network_header(skb2) < skb2->data || | |
1999 | skb_network_header(skb2) > skb_tail_pointer(skb2)) { | |
2000 | net_crit_ratelimited("protocol %04x is buggy, dev %s\n", | |
2001 | ntohs(skb2->protocol), | |
2002 | dev->name); | |
2003 | skb_reset_network_header(skb2); | |
1da177e4 | 2004 | } |
7866a621 SN |
2005 | |
2006 | skb2->transport_header = skb2->network_header; | |
2007 | skb2->pkt_type = PACKET_OUTGOING; | |
2008 | pt_prev = ptype; | |
2009 | } | |
2010 | ||
2011 | if (ptype_list == &ptype_all) { | |
2012 | ptype_list = &dev->ptype_all; | |
2013 | goto again; | |
1da177e4 | 2014 | } |
7866a621 | 2015 | out_unlock: |
581fe0ea WB |
2016 | if (pt_prev) { |
2017 | if (!skb_orphan_frags_rx(skb2, GFP_ATOMIC)) | |
2018 | pt_prev->func(skb2, skb->dev, pt_prev, skb->dev); | |
2019 | else | |
2020 | kfree_skb(skb2); | |
2021 | } | |
1da177e4 LT |
2022 | rcu_read_unlock(); |
2023 | } | |
74b20582 | 2024 | EXPORT_SYMBOL_GPL(dev_queue_xmit_nit); |
1da177e4 | 2025 | |
2c53040f BH |
2026 | /** |
2027 | * netif_setup_tc - Handle tc mappings on real_num_tx_queues change | |
4f57c087 JF |
2028 | * @dev: Network device |
2029 | * @txq: number of queues available | |
2030 | * | |
2031 | * If real_num_tx_queues is changed the tc mappings may no longer be | |
2032 | * valid. To resolve this verify the tc mapping remains valid and if | |
2033 | * not NULL the mapping. With no priorities mapping to this | |
2034 | * offset/count pair it will no longer be used. In the worst case TC0 | |
2035 | * is invalid nothing can be done so disable priority mappings. If is | |
2036 | * expected that drivers will fix this mapping if they can before | |
2037 | * calling netif_set_real_num_tx_queues. | |
2038 | */ | |
bb134d22 | 2039 | static void netif_setup_tc(struct net_device *dev, unsigned int txq) |
4f57c087 JF |
2040 | { |
2041 | int i; | |
2042 | struct netdev_tc_txq *tc = &dev->tc_to_txq[0]; | |
2043 | ||
2044 | /* If TC0 is invalidated disable TC mapping */ | |
2045 | if (tc->offset + tc->count > txq) { | |
7b6cd1ce | 2046 | pr_warn("Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n"); |
4f57c087 JF |
2047 | dev->num_tc = 0; |
2048 | return; | |
2049 | } | |
2050 | ||
2051 | /* Invalidated prio to tc mappings set to TC0 */ | |
2052 | for (i = 1; i < TC_BITMASK + 1; i++) { | |
2053 | int q = netdev_get_prio_tc_map(dev, i); | |
2054 | ||
2055 | tc = &dev->tc_to_txq[q]; | |
2056 | if (tc->offset + tc->count > txq) { | |
7b6cd1ce JP |
2057 | pr_warn("Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n", |
2058 | i, q); | |
4f57c087 JF |
2059 | netdev_set_prio_tc_map(dev, i, 0); |
2060 | } | |
2061 | } | |
2062 | } | |
2063 | ||
8d059b0f AD |
2064 | int netdev_txq_to_tc(struct net_device *dev, unsigned int txq) |
2065 | { | |
2066 | if (dev->num_tc) { | |
2067 | struct netdev_tc_txq *tc = &dev->tc_to_txq[0]; | |
2068 | int i; | |
2069 | ||
2070 | for (i = 0; i < TC_MAX_QUEUE; i++, tc++) { | |
2071 | if ((txq - tc->offset) < tc->count) | |
2072 | return i; | |
2073 | } | |
2074 | ||
2075 | return -1; | |
2076 | } | |
2077 | ||
2078 | return 0; | |
2079 | } | |
8a5f2166 | 2080 | EXPORT_SYMBOL(netdev_txq_to_tc); |
8d059b0f | 2081 | |
537c00de | 2082 | #ifdef CONFIG_XPS |
04157469 AN |
2083 | struct static_key xps_needed __read_mostly; |
2084 | EXPORT_SYMBOL(xps_needed); | |
2085 | struct static_key xps_rxqs_needed __read_mostly; | |
2086 | EXPORT_SYMBOL(xps_rxqs_needed); | |
537c00de AD |
2087 | static DEFINE_MUTEX(xps_map_mutex); |
2088 | #define xmap_dereference(P) \ | |
2089 | rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex)) | |
2090 | ||
6234f874 AD |
2091 | static bool remove_xps_queue(struct xps_dev_maps *dev_maps, |
2092 | int tci, u16 index) | |
537c00de | 2093 | { |
10cdc3f3 AD |
2094 | struct xps_map *map = NULL; |
2095 | int pos; | |
537c00de | 2096 | |
10cdc3f3 | 2097 | if (dev_maps) |
80d19669 | 2098 | map = xmap_dereference(dev_maps->attr_map[tci]); |
6234f874 AD |
2099 | if (!map) |
2100 | return false; | |
537c00de | 2101 | |
6234f874 AD |
2102 | for (pos = map->len; pos--;) { |
2103 | if (map->queues[pos] != index) | |
2104 | continue; | |
2105 | ||
2106 | if (map->len > 1) { | |
2107 | map->queues[pos] = map->queues[--map->len]; | |
10cdc3f3 | 2108 | break; |
537c00de | 2109 | } |
6234f874 | 2110 | |
80d19669 | 2111 | RCU_INIT_POINTER(dev_maps->attr_map[tci], NULL); |
6234f874 AD |
2112 | kfree_rcu(map, rcu); |
2113 | return false; | |
537c00de AD |
2114 | } |
2115 | ||
6234f874 | 2116 | return true; |
10cdc3f3 AD |
2117 | } |
2118 | ||
6234f874 AD |
2119 | static bool remove_xps_queue_cpu(struct net_device *dev, |
2120 | struct xps_dev_maps *dev_maps, | |
2121 | int cpu, u16 offset, u16 count) | |
2122 | { | |
184c449f AD |
2123 | int num_tc = dev->num_tc ? : 1; |
2124 | bool active = false; | |
2125 | int tci; | |
6234f874 | 2126 | |
184c449f AD |
2127 | for (tci = cpu * num_tc; num_tc--; tci++) { |
2128 | int i, j; | |
2129 | ||
2130 | for (i = count, j = offset; i--; j++) { | |
6358d49a | 2131 | if (!remove_xps_queue(dev_maps, tci, j)) |
184c449f AD |
2132 | break; |
2133 | } | |
2134 | ||
2135 | active |= i < 0; | |
6234f874 AD |
2136 | } |
2137 | ||
184c449f | 2138 | return active; |
6234f874 AD |
2139 | } |
2140 | ||
80d19669 AN |
2141 | static void clean_xps_maps(struct net_device *dev, const unsigned long *mask, |
2142 | struct xps_dev_maps *dev_maps, unsigned int nr_ids, | |
2143 | u16 offset, u16 count, bool is_rxqs_map) | |
2144 | { | |
2145 | bool active = false; | |
2146 | int i, j; | |
2147 | ||
2148 | for (j = -1; j = netif_attrmask_next(j, mask, nr_ids), | |
2149 | j < nr_ids;) | |
2150 | active |= remove_xps_queue_cpu(dev, dev_maps, j, offset, | |
2151 | count); | |
2152 | if (!active) { | |
2153 | if (is_rxqs_map) { | |
2154 | RCU_INIT_POINTER(dev->xps_rxqs_map, NULL); | |
2155 | } else { | |
2156 | RCU_INIT_POINTER(dev->xps_cpus_map, NULL); | |
2157 | ||
2158 | for (i = offset + (count - 1); count--; i--) | |
2159 | netdev_queue_numa_node_write( | |
2160 | netdev_get_tx_queue(dev, i), | |
2161 | NUMA_NO_NODE); | |
2162 | } | |
2163 | kfree_rcu(dev_maps, rcu); | |
2164 | } | |
2165 | } | |
2166 | ||
6234f874 AD |
2167 | static void netif_reset_xps_queues(struct net_device *dev, u16 offset, |
2168 | u16 count) | |
10cdc3f3 | 2169 | { |
80d19669 | 2170 | const unsigned long *possible_mask = NULL; |
10cdc3f3 | 2171 | struct xps_dev_maps *dev_maps; |
80d19669 | 2172 | unsigned int nr_ids; |
10cdc3f3 | 2173 | |
04157469 AN |
2174 | if (!static_key_false(&xps_needed)) |
2175 | return; | |
10cdc3f3 | 2176 | |
04157469 | 2177 | mutex_lock(&xps_map_mutex); |
10cdc3f3 | 2178 | |
04157469 AN |
2179 | if (static_key_false(&xps_rxqs_needed)) { |
2180 | dev_maps = xmap_dereference(dev->xps_rxqs_map); | |
2181 | if (dev_maps) { | |
2182 | nr_ids = dev->num_rx_queues; | |
2183 | clean_xps_maps(dev, possible_mask, dev_maps, nr_ids, | |
2184 | offset, count, true); | |
2185 | } | |
537c00de AD |
2186 | } |
2187 | ||
80d19669 AN |
2188 | dev_maps = xmap_dereference(dev->xps_cpus_map); |
2189 | if (!dev_maps) | |
2190 | goto out_no_maps; | |
2191 | ||
2192 | if (num_possible_cpus() > 1) | |
2193 | possible_mask = cpumask_bits(cpu_possible_mask); | |
2194 | nr_ids = nr_cpu_ids; | |
2195 | clean_xps_maps(dev, possible_mask, dev_maps, nr_ids, offset, count, | |
2196 | false); | |
024e9679 | 2197 | |
537c00de | 2198 | out_no_maps: |
04157469 AN |
2199 | if (static_key_enabled(&xps_rxqs_needed)) |
2200 | static_key_slow_dec(&xps_rxqs_needed); | |
2201 | ||
2202 | static_key_slow_dec(&xps_needed); | |
537c00de AD |
2203 | mutex_unlock(&xps_map_mutex); |
2204 | } | |
2205 | ||
6234f874 AD |
2206 | static void netif_reset_xps_queues_gt(struct net_device *dev, u16 index) |
2207 | { | |
2208 | netif_reset_xps_queues(dev, index, dev->num_tx_queues - index); | |
2209 | } | |
2210 | ||
80d19669 AN |
2211 | static struct xps_map *expand_xps_map(struct xps_map *map, int attr_index, |
2212 | u16 index, bool is_rxqs_map) | |
01c5f864 AD |
2213 | { |
2214 | struct xps_map *new_map; | |
2215 | int alloc_len = XPS_MIN_MAP_ALLOC; | |
2216 | int i, pos; | |
2217 | ||
2218 | for (pos = 0; map && pos < map->len; pos++) { | |
2219 | if (map->queues[pos] != index) | |
2220 | continue; | |
2221 | return map; | |
2222 | } | |
2223 | ||
80d19669 | 2224 | /* Need to add tx-queue to this CPU's/rx-queue's existing map */ |
01c5f864 AD |
2225 | if (map) { |
2226 | if (pos < map->alloc_len) | |
2227 | return map; | |
2228 | ||
2229 | alloc_len = map->alloc_len * 2; | |
2230 | } | |
2231 | ||
80d19669 AN |
2232 | /* Need to allocate new map to store tx-queue on this CPU's/rx-queue's |
2233 | * map | |
2234 | */ | |
2235 | if (is_rxqs_map) | |
2236 | new_map = kzalloc(XPS_MAP_SIZE(alloc_len), GFP_KERNEL); | |
2237 | else | |
2238 | new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len), GFP_KERNEL, | |
2239 | cpu_to_node(attr_index)); | |
01c5f864 AD |
2240 | if (!new_map) |
2241 | return NULL; | |
2242 | ||
2243 | for (i = 0; i < pos; i++) | |
2244 | new_map->queues[i] = map->queues[i]; | |
2245 | new_map->alloc_len = alloc_len; | |
2246 | new_map->len = pos; | |
2247 | ||
2248 | return new_map; | |
2249 | } | |
2250 | ||
80d19669 AN |
2251 | int __netif_set_xps_queue(struct net_device *dev, const unsigned long *mask, |
2252 | u16 index, bool is_rxqs_map) | |
537c00de | 2253 | { |
80d19669 | 2254 | const unsigned long *online_mask = NULL, *possible_mask = NULL; |
01c5f864 | 2255 | struct xps_dev_maps *dev_maps, *new_dev_maps = NULL; |
80d19669 | 2256 | int i, j, tci, numa_node_id = -2; |
184c449f | 2257 | int maps_sz, num_tc = 1, tc = 0; |
537c00de | 2258 | struct xps_map *map, *new_map; |
01c5f864 | 2259 | bool active = false; |
80d19669 | 2260 | unsigned int nr_ids; |
537c00de | 2261 | |
184c449f AD |
2262 | if (dev->num_tc) { |
2263 | num_tc = dev->num_tc; | |
2264 | tc = netdev_txq_to_tc(dev, index); | |
2265 | if (tc < 0) | |
2266 | return -EINVAL; | |
2267 | } | |
2268 | ||
537c00de | 2269 | mutex_lock(&xps_map_mutex); |
80d19669 AN |
2270 | if (is_rxqs_map) { |
2271 | maps_sz = XPS_RXQ_DEV_MAPS_SIZE(num_tc, dev->num_rx_queues); | |
2272 | dev_maps = xmap_dereference(dev->xps_rxqs_map); | |
2273 | nr_ids = dev->num_rx_queues; | |
2274 | } else { | |
2275 | maps_sz = XPS_CPU_DEV_MAPS_SIZE(num_tc); | |
2276 | if (num_possible_cpus() > 1) { | |
2277 | online_mask = cpumask_bits(cpu_online_mask); | |
2278 | possible_mask = cpumask_bits(cpu_possible_mask); | |
2279 | } | |
2280 | dev_maps = xmap_dereference(dev->xps_cpus_map); | |
2281 | nr_ids = nr_cpu_ids; | |
2282 | } | |
537c00de | 2283 | |
80d19669 AN |
2284 | if (maps_sz < L1_CACHE_BYTES) |
2285 | maps_sz = L1_CACHE_BYTES; | |
537c00de | 2286 | |
01c5f864 | 2287 | /* allocate memory for queue storage */ |
80d19669 AN |
2288 | for (j = -1; j = netif_attrmask_next_and(j, online_mask, mask, nr_ids), |
2289 | j < nr_ids;) { | |
01c5f864 AD |
2290 | if (!new_dev_maps) |
2291 | new_dev_maps = kzalloc(maps_sz, GFP_KERNEL); | |
2bb60cb9 AD |
2292 | if (!new_dev_maps) { |
2293 | mutex_unlock(&xps_map_mutex); | |
01c5f864 | 2294 | return -ENOMEM; |
2bb60cb9 | 2295 | } |
01c5f864 | 2296 | |
80d19669 AN |
2297 | tci = j * num_tc + tc; |
2298 | map = dev_maps ? xmap_dereference(dev_maps->attr_map[tci]) : | |
01c5f864 AD |
2299 | NULL; |
2300 | ||
80d19669 | 2301 | map = expand_xps_map(map, j, index, is_rxqs_map); |
01c5f864 AD |
2302 | if (!map) |
2303 | goto error; | |
2304 | ||
80d19669 | 2305 | RCU_INIT_POINTER(new_dev_maps->attr_map[tci], map); |
01c5f864 AD |
2306 | } |
2307 | ||
2308 | if (!new_dev_maps) | |
2309 | goto out_no_new_maps; | |
2310 | ||
04157469 AN |
2311 | static_key_slow_inc(&xps_needed); |
2312 | if (is_rxqs_map) | |
2313 | static_key_slow_inc(&xps_rxqs_needed); | |
2314 | ||
80d19669 AN |
2315 | for (j = -1; j = netif_attrmask_next(j, possible_mask, nr_ids), |
2316 | j < nr_ids;) { | |
184c449f | 2317 | /* copy maps belonging to foreign traffic classes */ |
80d19669 | 2318 | for (i = tc, tci = j * num_tc; dev_maps && i--; tci++) { |
184c449f | 2319 | /* fill in the new device map from the old device map */ |
80d19669 AN |
2320 | map = xmap_dereference(dev_maps->attr_map[tci]); |
2321 | RCU_INIT_POINTER(new_dev_maps->attr_map[tci], map); | |
184c449f AD |
2322 | } |
2323 | ||
2324 | /* We need to explicitly update tci as prevous loop | |
2325 | * could break out early if dev_maps is NULL. | |
2326 | */ | |
80d19669 | 2327 | tci = j * num_tc + tc; |
184c449f | 2328 | |
80d19669 AN |
2329 | if (netif_attr_test_mask(j, mask, nr_ids) && |
2330 | netif_attr_test_online(j, online_mask, nr_ids)) { | |
2331 | /* add tx-queue to CPU/rx-queue maps */ | |
01c5f864 AD |
2332 | int pos = 0; |
2333 | ||
80d19669 | 2334 | map = xmap_dereference(new_dev_maps->attr_map[tci]); |
01c5f864 AD |
2335 | while ((pos < map->len) && (map->queues[pos] != index)) |
2336 | pos++; | |
2337 | ||
2338 | if (pos == map->len) | |
2339 | map->queues[map->len++] = index; | |
537c00de | 2340 | #ifdef CONFIG_NUMA |
80d19669 AN |
2341 | if (!is_rxqs_map) { |
2342 | if (numa_node_id == -2) | |
2343 | numa_node_id = cpu_to_node(j); | |
2344 | else if (numa_node_id != cpu_to_node(j)) | |
2345 | numa_node_id = -1; | |
2346 | } | |
537c00de | 2347 | #endif |
01c5f864 AD |
2348 | } else if (dev_maps) { |
2349 | /* fill in the new device map from the old device map */ | |
80d19669 AN |
2350 | map = xmap_dereference(dev_maps->attr_map[tci]); |
2351 | RCU_INIT_POINTER(new_dev_maps->attr_map[tci], map); | |
537c00de | 2352 | } |
01c5f864 | 2353 | |
184c449f AD |
2354 | /* copy maps belonging to foreign traffic classes */ |
2355 | for (i = num_tc - tc, tci++; dev_maps && --i; tci++) { | |
2356 | /* fill in the new device map from the old device map */ | |
80d19669 AN |
2357 | map = xmap_dereference(dev_maps->attr_map[tci]); |
2358 | RCU_INIT_POINTER(new_dev_maps->attr_map[tci], map); | |
184c449f | 2359 | } |
537c00de AD |
2360 | } |
2361 | ||
80d19669 AN |
2362 | if (is_rxqs_map) |
2363 | rcu_assign_pointer(dev->xps_rxqs_map, new_dev_maps); | |
2364 | else | |
2365 | rcu_assign_pointer(dev->xps_cpus_map, new_dev_maps); | |
01c5f864 | 2366 | |
537c00de | 2367 | /* Cleanup old maps */ |
184c449f AD |
2368 | if (!dev_maps) |
2369 | goto out_no_old_maps; | |
2370 | ||
80d19669 AN |
2371 | for (j = -1; j = netif_attrmask_next(j, possible_mask, nr_ids), |
2372 | j < nr_ids;) { | |
2373 | for (i = num_tc, tci = j * num_tc; i--; tci++) { | |
2374 | new_map = xmap_dereference(new_dev_maps->attr_map[tci]); | |
2375 | map = xmap_dereference(dev_maps->attr_map[tci]); | |
01c5f864 AD |
2376 | if (map && map != new_map) |
2377 | kfree_rcu(map, rcu); | |
2378 | } | |
537c00de AD |
2379 | } |
2380 | ||
184c449f AD |
2381 | kfree_rcu(dev_maps, rcu); |
2382 | ||
2383 | out_no_old_maps: | |
01c5f864 AD |
2384 | dev_maps = new_dev_maps; |
2385 | active = true; | |
537c00de | 2386 | |
01c5f864 | 2387 | out_no_new_maps: |
80d19669 AN |
2388 | if (!is_rxqs_map) { |
2389 | /* update Tx queue numa node */ | |
2390 | netdev_queue_numa_node_write(netdev_get_tx_queue(dev, index), | |
2391 | (numa_node_id >= 0) ? | |
2392 | numa_node_id : NUMA_NO_NODE); | |
2393 | } | |
537c00de | 2394 | |
01c5f864 AD |
2395 | if (!dev_maps) |
2396 | goto out_no_maps; | |
2397 | ||
80d19669 AN |
2398 | /* removes tx-queue from unused CPUs/rx-queues */ |
2399 | for (j = -1; j = netif_attrmask_next(j, possible_mask, nr_ids), | |
2400 | j < nr_ids;) { | |
2401 | for (i = tc, tci = j * num_tc; i--; tci++) | |
184c449f | 2402 | active |= remove_xps_queue(dev_maps, tci, index); |
80d19669 AN |
2403 | if (!netif_attr_test_mask(j, mask, nr_ids) || |
2404 | !netif_attr_test_online(j, online_mask, nr_ids)) | |
184c449f AD |
2405 | active |= remove_xps_queue(dev_maps, tci, index); |
2406 | for (i = num_tc - tc, tci++; --i; tci++) | |
2407 | active |= remove_xps_queue(dev_maps, tci, index); | |
01c5f864 AD |
2408 | } |
2409 | ||
2410 | /* free map if not active */ | |
2411 | if (!active) { | |
80d19669 AN |
2412 | if (is_rxqs_map) |
2413 | RCU_INIT_POINTER(dev->xps_rxqs_map, NULL); | |
2414 | else | |
2415 | RCU_INIT_POINTER(dev->xps_cpus_map, NULL); | |
01c5f864 AD |
2416 | kfree_rcu(dev_maps, rcu); |
2417 | } | |
2418 | ||
2419 | out_no_maps: | |
537c00de AD |
2420 | mutex_unlock(&xps_map_mutex); |
2421 | ||
2422 | return 0; | |
2423 | error: | |
01c5f864 | 2424 | /* remove any maps that we added */ |
80d19669 AN |
2425 | for (j = -1; j = netif_attrmask_next(j, possible_mask, nr_ids), |
2426 | j < nr_ids;) { | |
2427 | for (i = num_tc, tci = j * num_tc; i--; tci++) { | |
2428 | new_map = xmap_dereference(new_dev_maps->attr_map[tci]); | |
184c449f | 2429 | map = dev_maps ? |
80d19669 | 2430 | xmap_dereference(dev_maps->attr_map[tci]) : |
184c449f AD |
2431 | NULL; |
2432 | if (new_map && new_map != map) | |
2433 | kfree(new_map); | |
2434 | } | |
01c5f864 AD |
2435 | } |
2436 | ||
537c00de AD |
2437 | mutex_unlock(&xps_map_mutex); |
2438 | ||
537c00de AD |
2439 | kfree(new_dev_maps); |
2440 | return -ENOMEM; | |
2441 | } | |
80d19669 AN |
2442 | |
2443 | int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask, | |
2444 | u16 index) | |
2445 | { | |
2446 | return __netif_set_xps_queue(dev, cpumask_bits(mask), index, false); | |
2447 | } | |
537c00de AD |
2448 | EXPORT_SYMBOL(netif_set_xps_queue); |
2449 | ||
2450 | #endif | |
9cf1f6a8 AD |
2451 | void netdev_reset_tc(struct net_device *dev) |
2452 | { | |
6234f874 AD |
2453 | #ifdef CONFIG_XPS |
2454 | netif_reset_xps_queues_gt(dev, 0); | |
2455 | #endif | |
9cf1f6a8 AD |
2456 | dev->num_tc = 0; |
2457 | memset(dev->tc_to_txq, 0, sizeof(dev->tc_to_txq)); | |
2458 | memset(dev->prio_tc_map, 0, sizeof(dev->prio_tc_map)); | |
2459 | } | |
2460 | EXPORT_SYMBOL(netdev_reset_tc); | |
2461 | ||
2462 | int netdev_set_tc_queue(struct net_device *dev, u8 tc, u16 count, u16 offset) | |
2463 | { | |
2464 | if (tc >= dev->num_tc) | |
2465 | return -EINVAL; | |
2466 | ||
6234f874 AD |
2467 | #ifdef CONFIG_XPS |
2468 | netif_reset_xps_queues(dev, offset, count); | |
2469 | #endif | |
9cf1f6a8 AD |
2470 | dev->tc_to_txq[tc].count = count; |
2471 | dev->tc_to_txq[tc].offset = offset; | |
2472 | return 0; | |
2473 | } | |
2474 | EXPORT_SYMBOL(netdev_set_tc_queue); | |
2475 | ||
2476 | int netdev_set_num_tc(struct net_device *dev, u8 num_tc) | |
2477 | { | |
2478 | if (num_tc > TC_MAX_QUEUE) | |
2479 | return -EINVAL; | |
2480 | ||
6234f874 AD |
2481 | #ifdef CONFIG_XPS |
2482 | netif_reset_xps_queues_gt(dev, 0); | |
2483 | #endif | |
9cf1f6a8 AD |
2484 | dev->num_tc = num_tc; |
2485 | return 0; | |
2486 | } | |
2487 | EXPORT_SYMBOL(netdev_set_num_tc); | |
2488 | ||
f0796d5c JF |
2489 | /* |
2490 | * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues | |
3a053b1a | 2491 | * greater than real_num_tx_queues stale skbs on the qdisc must be flushed. |
f0796d5c | 2492 | */ |
e6484930 | 2493 | int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq) |
f0796d5c | 2494 | { |
ac5b7019 | 2495 | bool disabling; |
1d24eb48 TH |
2496 | int rc; |
2497 | ||
ac5b7019 JK |
2498 | disabling = txq < dev->real_num_tx_queues; |
2499 | ||
e6484930 TH |
2500 | if (txq < 1 || txq > dev->num_tx_queues) |
2501 | return -EINVAL; | |
f0796d5c | 2502 | |
5c56580b BH |
2503 | if (dev->reg_state == NETREG_REGISTERED || |
2504 | dev->reg_state == NETREG_UNREGISTERING) { | |
e6484930 TH |
2505 | ASSERT_RTNL(); |
2506 | ||
1d24eb48 TH |
2507 | rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues, |
2508 | txq); | |
bf264145 TH |
2509 | if (rc) |
2510 | return rc; | |
2511 | ||
4f57c087 JF |
2512 | if (dev->num_tc) |
2513 | netif_setup_tc(dev, txq); | |
2514 | ||
ac5b7019 JK |
2515 | dev->real_num_tx_queues = txq; |
2516 | ||
2517 | if (disabling) { | |
2518 | synchronize_net(); | |
e6484930 | 2519 | qdisc_reset_all_tx_gt(dev, txq); |
024e9679 AD |
2520 | #ifdef CONFIG_XPS |
2521 | netif_reset_xps_queues_gt(dev, txq); | |
2522 | #endif | |
2523 | } | |
ac5b7019 JK |
2524 | } else { |
2525 | dev->real_num_tx_queues = txq; | |
f0796d5c | 2526 | } |
e6484930 | 2527 | |
e6484930 | 2528 | return 0; |
f0796d5c JF |
2529 | } |
2530 | EXPORT_SYMBOL(netif_set_real_num_tx_queues); | |
56079431 | 2531 | |
a953be53 | 2532 | #ifdef CONFIG_SYSFS |
62fe0b40 BH |
2533 | /** |
2534 | * netif_set_real_num_rx_queues - set actual number of RX queues used | |
2535 | * @dev: Network device | |
2536 | * @rxq: Actual number of RX queues | |
2537 | * | |
2538 | * This must be called either with the rtnl_lock held or before | |
2539 | * registration of the net device. Returns 0 on success, or a | |
4e7f7951 BH |
2540 | * negative error code. If called before registration, it always |
2541 | * succeeds. | |
62fe0b40 BH |
2542 | */ |
2543 | int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq) | |
2544 | { | |
2545 | int rc; | |
2546 | ||
bd25fa7b TH |
2547 | if (rxq < 1 || rxq > dev->num_rx_queues) |
2548 | return -EINVAL; | |
2549 | ||
62fe0b40 BH |
2550 | if (dev->reg_state == NETREG_REGISTERED) { |
2551 | ASSERT_RTNL(); | |
2552 | ||
62fe0b40 BH |
2553 | rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues, |
2554 | rxq); | |
2555 | if (rc) | |
2556 | return rc; | |
62fe0b40 BH |
2557 | } |
2558 | ||
2559 | dev->real_num_rx_queues = rxq; | |
2560 | return 0; | |
2561 | } | |
2562 | EXPORT_SYMBOL(netif_set_real_num_rx_queues); | |
2563 | #endif | |
2564 | ||
2c53040f BH |
2565 | /** |
2566 | * netif_get_num_default_rss_queues - default number of RSS queues | |
16917b87 YM |
2567 | * |
2568 | * This routine should set an upper limit on the number of RSS queues | |
2569 | * used by default by multiqueue devices. | |
2570 | */ | |
a55b138b | 2571 | int netif_get_num_default_rss_queues(void) |
16917b87 | 2572 | { |
40e4e713 HS |
2573 | return is_kdump_kernel() ? |
2574 | 1 : min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES, num_online_cpus()); | |
16917b87 YM |
2575 | } |
2576 | EXPORT_SYMBOL(netif_get_num_default_rss_queues); | |
2577 | ||
3bcb846c | 2578 | static void __netif_reschedule(struct Qdisc *q) |
56079431 | 2579 | { |
def82a1d JP |
2580 | struct softnet_data *sd; |
2581 | unsigned long flags; | |
56079431 | 2582 | |
def82a1d | 2583 | local_irq_save(flags); |
903ceff7 | 2584 | sd = this_cpu_ptr(&softnet_data); |
a9cbd588 CG |
2585 | q->next_sched = NULL; |
2586 | *sd->output_queue_tailp = q; | |
2587 | sd->output_queue_tailp = &q->next_sched; | |
def82a1d JP |
2588 | raise_softirq_irqoff(NET_TX_SOFTIRQ); |
2589 | local_irq_restore(flags); | |
2590 | } | |
2591 | ||
2592 | void __netif_schedule(struct Qdisc *q) | |
2593 | { | |
2594 | if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state)) | |
2595 | __netif_reschedule(q); | |
56079431 DV |
2596 | } |
2597 | EXPORT_SYMBOL(__netif_schedule); | |
2598 | ||
e6247027 ED |
2599 | struct dev_kfree_skb_cb { |
2600 | enum skb_free_reason reason; | |
2601 | }; | |
2602 | ||
2603 | static struct dev_kfree_skb_cb *get_kfree_skb_cb(const struct sk_buff *skb) | |
56079431 | 2604 | { |
e6247027 ED |
2605 | return (struct dev_kfree_skb_cb *)skb->cb; |
2606 | } | |
2607 | ||
46e5da40 JF |
2608 | void netif_schedule_queue(struct netdev_queue *txq) |
2609 | { | |
2610 | rcu_read_lock(); | |
2611 | if (!(txq->state & QUEUE_STATE_ANY_XOFF)) { | |
2612 | struct Qdisc *q = rcu_dereference(txq->qdisc); | |
2613 | ||
2614 | __netif_schedule(q); | |
2615 | } | |
2616 | rcu_read_unlock(); | |
2617 | } | |
2618 | EXPORT_SYMBOL(netif_schedule_queue); | |
2619 | ||
46e5da40 JF |
2620 | void netif_tx_wake_queue(struct netdev_queue *dev_queue) |
2621 | { | |
2622 | if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state)) { | |
2623 | struct Qdisc *q; | |
2624 | ||
2625 | rcu_read_lock(); | |
2626 | q = rcu_dereference(dev_queue->qdisc); | |
2627 | __netif_schedule(q); | |
2628 | rcu_read_unlock(); | |
2629 | } | |
2630 | } | |
2631 | EXPORT_SYMBOL(netif_tx_wake_queue); | |
2632 | ||
e6247027 | 2633 | void __dev_kfree_skb_irq(struct sk_buff *skb, enum skb_free_reason reason) |
56079431 | 2634 | { |
e6247027 | 2635 | unsigned long flags; |
56079431 | 2636 | |
9899886d MJ |
2637 | if (unlikely(!skb)) |
2638 | return; | |
2639 | ||
63354797 | 2640 | if (likely(refcount_read(&skb->users) == 1)) { |
e6247027 | 2641 | smp_rmb(); |
63354797 RE |
2642 | refcount_set(&skb->users, 0); |
2643 | } else if (likely(!refcount_dec_and_test(&skb->users))) { | |
e6247027 | 2644 | return; |
bea3348e | 2645 | } |
e6247027 ED |
2646 | get_kfree_skb_cb(skb)->reason = reason; |
2647 | local_irq_save(flags); | |
2648 | skb->next = __this_cpu_read(softnet_data.completion_queue); | |
2649 | __this_cpu_write(softnet_data.completion_queue, skb); | |
2650 | raise_softirq_irqoff(NET_TX_SOFTIRQ); | |
2651 | local_irq_restore(flags); | |
56079431 | 2652 | } |
e6247027 | 2653 | EXPORT_SYMBOL(__dev_kfree_skb_irq); |
56079431 | 2654 | |
e6247027 | 2655 | void __dev_kfree_skb_any(struct sk_buff *skb, enum skb_free_reason reason) |
56079431 DV |
2656 | { |
2657 | if (in_irq() || irqs_disabled()) | |
e6247027 | 2658 | __dev_kfree_skb_irq(skb, reason); |
56079431 DV |
2659 | else |
2660 | dev_kfree_skb(skb); | |
2661 | } | |
e6247027 | 2662 | EXPORT_SYMBOL(__dev_kfree_skb_any); |
56079431 DV |
2663 | |
2664 | ||
bea3348e SH |
2665 | /** |
2666 | * netif_device_detach - mark device as removed | |
2667 | * @dev: network device | |
2668 | * | |
2669 | * Mark device as removed from system and therefore no longer available. | |
2670 | */ | |
56079431 DV |
2671 | void netif_device_detach(struct net_device *dev) |
2672 | { | |
2673 | if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) && | |
2674 | netif_running(dev)) { | |
d543103a | 2675 | netif_tx_stop_all_queues(dev); |
56079431 DV |
2676 | } |
2677 | } | |
2678 | EXPORT_SYMBOL(netif_device_detach); | |
2679 | ||
bea3348e SH |
2680 | /** |
2681 | * netif_device_attach - mark device as attached | |
2682 | * @dev: network device | |
2683 | * | |
2684 | * Mark device as attached from system and restart if needed. | |
2685 | */ | |
56079431 DV |
2686 | void netif_device_attach(struct net_device *dev) |
2687 | { | |
2688 | if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) && | |
2689 | netif_running(dev)) { | |
d543103a | 2690 | netif_tx_wake_all_queues(dev); |
4ec93edb | 2691 | __netdev_watchdog_up(dev); |
56079431 DV |
2692 | } |
2693 | } | |
2694 | EXPORT_SYMBOL(netif_device_attach); | |
2695 | ||
5605c762 JP |
2696 | /* |
2697 | * Returns a Tx hash based on the given packet descriptor a Tx queues' number | |
2698 | * to be used as a distribution range. | |
2699 | */ | |
1b837d48 | 2700 | static u16 skb_tx_hash(const struct net_device *dev, struct sk_buff *skb) |
5605c762 JP |
2701 | { |
2702 | u32 hash; | |
2703 | u16 qoffset = 0; | |
1b837d48 | 2704 | u16 qcount = dev->real_num_tx_queues; |
5605c762 JP |
2705 | |
2706 | if (skb_rx_queue_recorded(skb)) { | |
2707 | hash = skb_get_rx_queue(skb); | |
1b837d48 AD |
2708 | while (unlikely(hash >= qcount)) |
2709 | hash -= qcount; | |
5605c762 JP |
2710 | return hash; |
2711 | } | |
2712 | ||
2713 | if (dev->num_tc) { | |
2714 | u8 tc = netdev_get_prio_tc_map(dev, skb->priority); | |
f4563a75 | 2715 | |
5605c762 JP |
2716 | qoffset = dev->tc_to_txq[tc].offset; |
2717 | qcount = dev->tc_to_txq[tc].count; | |
2718 | } | |
2719 | ||
2720 | return (u16) reciprocal_scale(skb_get_hash(skb), qcount) + qoffset; | |
2721 | } | |
5605c762 | 2722 | |
36c92474 BH |
2723 | static void skb_warn_bad_offload(const struct sk_buff *skb) |
2724 | { | |
84d15ae5 | 2725 | static const netdev_features_t null_features; |
36c92474 | 2726 | struct net_device *dev = skb->dev; |
88ad4175 | 2727 | const char *name = ""; |
36c92474 | 2728 | |
c846ad9b BG |
2729 | if (!net_ratelimit()) |
2730 | return; | |
2731 | ||
88ad4175 BM |
2732 | if (dev) { |
2733 | if (dev->dev.parent) | |
2734 | name = dev_driver_string(dev->dev.parent); | |
2735 | else | |
2736 | name = netdev_name(dev); | |
2737 | } | |
36c92474 BH |
2738 | WARN(1, "%s: caps=(%pNF, %pNF) len=%d data_len=%d gso_size=%d " |
2739 | "gso_type=%d ip_summed=%d\n", | |
88ad4175 | 2740 | name, dev ? &dev->features : &null_features, |
65e9d2fa | 2741 | skb->sk ? &skb->sk->sk_route_caps : &null_features, |
36c92474 BH |
2742 | skb->len, skb->data_len, skb_shinfo(skb)->gso_size, |
2743 | skb_shinfo(skb)->gso_type, skb->ip_summed); | |
2744 | } | |
2745 | ||
1da177e4 LT |
2746 | /* |
2747 | * Invalidate hardware checksum when packet is to be mangled, and | |
2748 | * complete checksum manually on outgoing path. | |
2749 | */ | |
84fa7933 | 2750 | int skb_checksum_help(struct sk_buff *skb) |
1da177e4 | 2751 | { |
d3bc23e7 | 2752 | __wsum csum; |
663ead3b | 2753 | int ret = 0, offset; |
1da177e4 | 2754 | |
84fa7933 | 2755 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
a430a43d HX |
2756 | goto out_set_summed; |
2757 | ||
2758 | if (unlikely(skb_shinfo(skb)->gso_size)) { | |
36c92474 BH |
2759 | skb_warn_bad_offload(skb); |
2760 | return -EINVAL; | |
1da177e4 LT |
2761 | } |
2762 | ||
cef401de ED |
2763 | /* Before computing a checksum, we should make sure no frag could |
2764 | * be modified by an external entity : checksum could be wrong. | |
2765 | */ | |
2766 | if (skb_has_shared_frag(skb)) { | |
2767 | ret = __skb_linearize(skb); | |
2768 | if (ret) | |
2769 | goto out; | |
2770 | } | |
2771 | ||
55508d60 | 2772 | offset = skb_checksum_start_offset(skb); |
a030847e HX |
2773 | BUG_ON(offset >= skb_headlen(skb)); |
2774 | csum = skb_checksum(skb, offset, skb->len - offset, 0); | |
2775 | ||
2776 | offset += skb->csum_offset; | |
2777 | BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb)); | |
2778 | ||
2779 | if (skb_cloned(skb) && | |
2780 | !skb_clone_writable(skb, offset + sizeof(__sum16))) { | |
1da177e4 LT |
2781 | ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC); |
2782 | if (ret) | |
2783 | goto out; | |
2784 | } | |
2785 | ||
4f2e4ad5 | 2786 | *(__sum16 *)(skb->data + offset) = csum_fold(csum) ?: CSUM_MANGLED_0; |
a430a43d | 2787 | out_set_summed: |
1da177e4 | 2788 | skb->ip_summed = CHECKSUM_NONE; |
4ec93edb | 2789 | out: |
1da177e4 LT |
2790 | return ret; |
2791 | } | |
d1b19dff | 2792 | EXPORT_SYMBOL(skb_checksum_help); |
1da177e4 | 2793 | |
b72b5bf6 DC |
2794 | int skb_crc32c_csum_help(struct sk_buff *skb) |
2795 | { | |
2796 | __le32 crc32c_csum; | |
2797 | int ret = 0, offset, start; | |
2798 | ||
2799 | if (skb->ip_summed != CHECKSUM_PARTIAL) | |
2800 | goto out; | |
2801 | ||
2802 | if (unlikely(skb_is_gso(skb))) | |
2803 | goto out; | |
2804 | ||
2805 | /* Before computing a checksum, we should make sure no frag could | |
2806 | * be modified by an external entity : checksum could be wrong. | |
2807 | */ | |
2808 | if (unlikely(skb_has_shared_frag(skb))) { | |
2809 | ret = __skb_linearize(skb); | |
2810 | if (ret) | |
2811 | goto out; | |
2812 | } | |
2813 | start = skb_checksum_start_offset(skb); | |
2814 | offset = start + offsetof(struct sctphdr, checksum); | |
2815 | if (WARN_ON_ONCE(offset >= skb_headlen(skb))) { | |
2816 | ret = -EINVAL; | |
2817 | goto out; | |
2818 | } | |
2819 | if (skb_cloned(skb) && | |
2820 | !skb_clone_writable(skb, offset + sizeof(__le32))) { | |
2821 | ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC); | |
2822 | if (ret) | |
2823 | goto out; | |
2824 | } | |
2825 | crc32c_csum = cpu_to_le32(~__skb_checksum(skb, start, | |
2826 | skb->len - start, ~(__u32)0, | |
2827 | crc32c_csum_stub)); | |
2828 | *(__le32 *)(skb->data + offset) = crc32c_csum; | |
2829 | skb->ip_summed = CHECKSUM_NONE; | |
dba00306 | 2830 | skb->csum_not_inet = 0; |
b72b5bf6 DC |
2831 | out: |
2832 | return ret; | |
2833 | } | |
2834 | ||
53d6471c | 2835 | __be16 skb_network_protocol(struct sk_buff *skb, int *depth) |
f6a78bfc | 2836 | { |
252e3346 | 2837 | __be16 type = skb->protocol; |
f6a78bfc | 2838 | |
19acc327 PS |
2839 | /* Tunnel gso handlers can set protocol to ethernet. */ |
2840 | if (type == htons(ETH_P_TEB)) { | |
2841 | struct ethhdr *eth; | |
2842 | ||
2843 | if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr)))) | |
2844 | return 0; | |
2845 | ||
1dfe82eb | 2846 | eth = (struct ethhdr *)skb->data; |
19acc327 PS |
2847 | type = eth->h_proto; |
2848 | } | |
2849 | ||
d4bcef3f | 2850 | return __vlan_get_protocol(skb, type, depth); |
ec5f0615 PS |
2851 | } |
2852 | ||
2853 | /** | |
2854 | * skb_mac_gso_segment - mac layer segmentation handler. | |
2855 | * @skb: buffer to segment | |
2856 | * @features: features for the output path (see dev->features) | |
2857 | */ | |
2858 | struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb, | |
2859 | netdev_features_t features) | |
2860 | { | |
2861 | struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT); | |
2862 | struct packet_offload *ptype; | |
53d6471c VY |
2863 | int vlan_depth = skb->mac_len; |
2864 | __be16 type = skb_network_protocol(skb, &vlan_depth); | |
ec5f0615 PS |
2865 | |
2866 | if (unlikely(!type)) | |
2867 | return ERR_PTR(-EINVAL); | |
2868 | ||
53d6471c | 2869 | __skb_pull(skb, vlan_depth); |
f6a78bfc HX |
2870 | |
2871 | rcu_read_lock(); | |
22061d80 | 2872 | list_for_each_entry_rcu(ptype, &offload_base, list) { |
f191a1d1 | 2873 | if (ptype->type == type && ptype->callbacks.gso_segment) { |
f191a1d1 | 2874 | segs = ptype->callbacks.gso_segment(skb, features); |
f6a78bfc HX |
2875 | break; |
2876 | } | |
2877 | } | |
2878 | rcu_read_unlock(); | |
2879 | ||
98e399f8 | 2880 | __skb_push(skb, skb->data - skb_mac_header(skb)); |
576a30eb | 2881 | |
f6a78bfc HX |
2882 | return segs; |
2883 | } | |
05e8ef4a PS |
2884 | EXPORT_SYMBOL(skb_mac_gso_segment); |
2885 | ||
2886 | ||
2887 | /* openvswitch calls this on rx path, so we need a different check. | |
2888 | */ | |
2889 | static inline bool skb_needs_check(struct sk_buff *skb, bool tx_path) | |
2890 | { | |
2891 | if (tx_path) | |
0c19f846 WB |
2892 | return skb->ip_summed != CHECKSUM_PARTIAL && |
2893 | skb->ip_summed != CHECKSUM_UNNECESSARY; | |
6e7bc478 ED |
2894 | |
2895 | return skb->ip_summed == CHECKSUM_NONE; | |
05e8ef4a PS |
2896 | } |
2897 | ||
2898 | /** | |
2899 | * __skb_gso_segment - Perform segmentation on skb. | |
2900 | * @skb: buffer to segment | |
2901 | * @features: features for the output path (see dev->features) | |
2902 | * @tx_path: whether it is called in TX path | |
2903 | * | |
2904 | * This function segments the given skb and returns a list of segments. | |
2905 | * | |
2906 | * It may return NULL if the skb requires no segmentation. This is | |
2907 | * only possible when GSO is used for verifying header integrity. | |
9207f9d4 KK |
2908 | * |
2909 | * Segmentation preserves SKB_SGO_CB_OFFSET bytes of previous skb cb. | |
05e8ef4a PS |
2910 | */ |
2911 | struct sk_buff *__skb_gso_segment(struct sk_buff *skb, | |
2912 | netdev_features_t features, bool tx_path) | |
2913 | { | |
b2504a5d ED |
2914 | struct sk_buff *segs; |
2915 | ||
05e8ef4a PS |
2916 | if (unlikely(skb_needs_check(skb, tx_path))) { |
2917 | int err; | |
2918 | ||
b2504a5d | 2919 | /* We're going to init ->check field in TCP or UDP header */ |
a40e0a66 | 2920 | err = skb_cow_head(skb, 0); |
2921 | if (err < 0) | |
05e8ef4a PS |
2922 | return ERR_PTR(err); |
2923 | } | |
2924 | ||
802ab55a AD |
2925 | /* Only report GSO partial support if it will enable us to |
2926 | * support segmentation on this frame without needing additional | |
2927 | * work. | |
2928 | */ | |
2929 | if (features & NETIF_F_GSO_PARTIAL) { | |
2930 | netdev_features_t partial_features = NETIF_F_GSO_ROBUST; | |
2931 | struct net_device *dev = skb->dev; | |
2932 | ||
2933 | partial_features |= dev->features & dev->gso_partial_features; | |
2934 | if (!skb_gso_ok(skb, features | partial_features)) | |
2935 | features &= ~NETIF_F_GSO_PARTIAL; | |
2936 | } | |
2937 | ||
9207f9d4 KK |
2938 | BUILD_BUG_ON(SKB_SGO_CB_OFFSET + |
2939 | sizeof(*SKB_GSO_CB(skb)) > sizeof(skb->cb)); | |
2940 | ||
68c33163 | 2941 | SKB_GSO_CB(skb)->mac_offset = skb_headroom(skb); |
3347c960 ED |
2942 | SKB_GSO_CB(skb)->encap_level = 0; |
2943 | ||
05e8ef4a PS |
2944 | skb_reset_mac_header(skb); |
2945 | skb_reset_mac_len(skb); | |
2946 | ||
b2504a5d ED |
2947 | segs = skb_mac_gso_segment(skb, features); |
2948 | ||
8d74e9f8 | 2949 | if (unlikely(skb_needs_check(skb, tx_path) && !IS_ERR(segs))) |
b2504a5d ED |
2950 | skb_warn_bad_offload(skb); |
2951 | ||
2952 | return segs; | |
05e8ef4a | 2953 | } |
12b0004d | 2954 | EXPORT_SYMBOL(__skb_gso_segment); |
f6a78bfc | 2955 | |
fb286bb2 HX |
2956 | /* Take action when hardware reception checksum errors are detected. */ |
2957 | #ifdef CONFIG_BUG | |
2958 | void netdev_rx_csum_fault(struct net_device *dev) | |
2959 | { | |
2960 | if (net_ratelimit()) { | |
7b6cd1ce | 2961 | pr_err("%s: hw csum failure\n", dev ? dev->name : "<unknown>"); |
fb286bb2 HX |
2962 | dump_stack(); |
2963 | } | |
2964 | } | |
2965 | EXPORT_SYMBOL(netdev_rx_csum_fault); | |
2966 | #endif | |
2967 | ||
ab74cfeb | 2968 | /* XXX: check that highmem exists at all on the given machine. */ |
c1e756bf | 2969 | static int illegal_highdma(struct net_device *dev, struct sk_buff *skb) |
1da177e4 | 2970 | { |
3d3a8533 | 2971 | #ifdef CONFIG_HIGHMEM |
1da177e4 | 2972 | int i; |
f4563a75 | 2973 | |
5acbbd42 | 2974 | if (!(dev->features & NETIF_F_HIGHDMA)) { |
ea2ab693 IC |
2975 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { |
2976 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; | |
f4563a75 | 2977 | |
ea2ab693 | 2978 | if (PageHighMem(skb_frag_page(frag))) |
5acbbd42 | 2979 | return 1; |
ea2ab693 | 2980 | } |
5acbbd42 | 2981 | } |
3d3a8533 | 2982 | #endif |
1da177e4 LT |
2983 | return 0; |
2984 | } | |
1da177e4 | 2985 | |
3b392ddb SH |
2986 | /* If MPLS offload request, verify we are testing hardware MPLS features |
2987 | * instead of standard features for the netdev. | |
2988 | */ | |
d0edc7bf | 2989 | #if IS_ENABLED(CONFIG_NET_MPLS_GSO) |
3b392ddb SH |
2990 | static netdev_features_t net_mpls_features(struct sk_buff *skb, |
2991 | netdev_features_t features, | |
2992 | __be16 type) | |
2993 | { | |
25cd9ba0 | 2994 | if (eth_p_mpls(type)) |
3b392ddb SH |
2995 | features &= skb->dev->mpls_features; |
2996 | ||
2997 | return features; | |
2998 | } | |
2999 | #else | |
3000 | static netdev_features_t net_mpls_features(struct sk_buff *skb, | |
3001 | netdev_features_t features, | |
3002 | __be16 type) | |
3003 | { | |
3004 | return features; | |
3005 | } | |
3006 | #endif | |
3007 | ||
c8f44aff | 3008 | static netdev_features_t harmonize_features(struct sk_buff *skb, |
c1e756bf | 3009 | netdev_features_t features) |
f01a5236 | 3010 | { |
53d6471c | 3011 | int tmp; |
3b392ddb SH |
3012 | __be16 type; |
3013 | ||
3014 | type = skb_network_protocol(skb, &tmp); | |
3015 | features = net_mpls_features(skb, features, type); | |
53d6471c | 3016 | |
c0d680e5 | 3017 | if (skb->ip_summed != CHECKSUM_NONE && |
3b392ddb | 3018 | !can_checksum_protocol(features, type)) { |
996e8021 | 3019 | features &= ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK); |
f01a5236 | 3020 | } |
7be2c82c ED |
3021 | if (illegal_highdma(skb->dev, skb)) |
3022 | features &= ~NETIF_F_SG; | |
f01a5236 JG |
3023 | |
3024 | return features; | |
3025 | } | |
3026 | ||
e38f3025 TM |
3027 | netdev_features_t passthru_features_check(struct sk_buff *skb, |
3028 | struct net_device *dev, | |
3029 | netdev_features_t features) | |
3030 | { | |
3031 | return features; | |
3032 | } | |
3033 | EXPORT_SYMBOL(passthru_features_check); | |
3034 | ||
7ce23672 | 3035 | static netdev_features_t dflt_features_check(struct sk_buff *skb, |
8cb65d00 TM |
3036 | struct net_device *dev, |
3037 | netdev_features_t features) | |
3038 | { | |
3039 | return vlan_features_check(skb, features); | |
3040 | } | |
3041 | ||
cbc53e08 AD |
3042 | static netdev_features_t gso_features_check(const struct sk_buff *skb, |
3043 | struct net_device *dev, | |
3044 | netdev_features_t features) | |
3045 | { | |
3046 | u16 gso_segs = skb_shinfo(skb)->gso_segs; | |
3047 | ||
3048 | if (gso_segs > dev->gso_max_segs) | |
3049 | return features & ~NETIF_F_GSO_MASK; | |
3050 | ||
802ab55a AD |
3051 | /* Support for GSO partial features requires software |
3052 | * intervention before we can actually process the packets | |
3053 | * so we need to strip support for any partial features now | |
3054 | * and we can pull them back in after we have partially | |
3055 | * segmented the frame. | |
3056 | */ | |
3057 | if (!(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL)) | |
3058 | features &= ~dev->gso_partial_features; | |
3059 | ||
3060 | /* Make sure to clear the IPv4 ID mangling feature if the | |
3061 | * IPv4 header has the potential to be fragmented. | |
cbc53e08 AD |
3062 | */ |
3063 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) { | |
3064 | struct iphdr *iph = skb->encapsulation ? | |
3065 | inner_ip_hdr(skb) : ip_hdr(skb); | |
3066 | ||
3067 | if (!(iph->frag_off & htons(IP_DF))) | |
3068 | features &= ~NETIF_F_TSO_MANGLEID; | |
3069 | } | |
3070 | ||
3071 | return features; | |
3072 | } | |
3073 | ||
c1e756bf | 3074 | netdev_features_t netif_skb_features(struct sk_buff *skb) |
58e998c6 | 3075 | { |
5f35227e | 3076 | struct net_device *dev = skb->dev; |
fcbeb976 | 3077 | netdev_features_t features = dev->features; |
58e998c6 | 3078 | |
cbc53e08 AD |
3079 | if (skb_is_gso(skb)) |
3080 | features = gso_features_check(skb, dev, features); | |
30b678d8 | 3081 | |
5f35227e JG |
3082 | /* If encapsulation offload request, verify we are testing |
3083 | * hardware encapsulation features instead of standard | |
3084 | * features for the netdev | |
3085 | */ | |
3086 | if (skb->encapsulation) | |
3087 | features &= dev->hw_enc_features; | |
3088 | ||
f5a7fb88 TM |
3089 | if (skb_vlan_tagged(skb)) |
3090 | features = netdev_intersect_features(features, | |
3091 | dev->vlan_features | | |
3092 | NETIF_F_HW_VLAN_CTAG_TX | | |
3093 | NETIF_F_HW_VLAN_STAG_TX); | |
f01a5236 | 3094 | |
5f35227e JG |
3095 | if (dev->netdev_ops->ndo_features_check) |
3096 | features &= dev->netdev_ops->ndo_features_check(skb, dev, | |
3097 | features); | |
8cb65d00 TM |
3098 | else |
3099 | features &= dflt_features_check(skb, dev, features); | |
5f35227e | 3100 | |
c1e756bf | 3101 | return harmonize_features(skb, features); |
58e998c6 | 3102 | } |
c1e756bf | 3103 | EXPORT_SYMBOL(netif_skb_features); |
58e998c6 | 3104 | |
2ea25513 | 3105 | static int xmit_one(struct sk_buff *skb, struct net_device *dev, |
95f6b3dd | 3106 | struct netdev_queue *txq, bool more) |
f6a78bfc | 3107 | { |
2ea25513 DM |
3108 | unsigned int len; |
3109 | int rc; | |
00829823 | 3110 | |
7866a621 | 3111 | if (!list_empty(&ptype_all) || !list_empty(&dev->ptype_all)) |
2ea25513 | 3112 | dev_queue_xmit_nit(skb, dev); |
fc741216 | 3113 | |
2ea25513 DM |
3114 | len = skb->len; |
3115 | trace_net_dev_start_xmit(skb, dev); | |
95f6b3dd | 3116 | rc = netdev_start_xmit(skb, dev, txq, more); |
2ea25513 | 3117 | trace_net_dev_xmit(skb, rc, dev, len); |
adf30907 | 3118 | |
2ea25513 DM |
3119 | return rc; |
3120 | } | |
7b9c6090 | 3121 | |
8dcda22a DM |
3122 | struct sk_buff *dev_hard_start_xmit(struct sk_buff *first, struct net_device *dev, |
3123 | struct netdev_queue *txq, int *ret) | |
7f2e870f DM |
3124 | { |
3125 | struct sk_buff *skb = first; | |
3126 | int rc = NETDEV_TX_OK; | |
7b9c6090 | 3127 | |
7f2e870f DM |
3128 | while (skb) { |
3129 | struct sk_buff *next = skb->next; | |
fc70fb64 | 3130 | |
7f2e870f | 3131 | skb->next = NULL; |
95f6b3dd | 3132 | rc = xmit_one(skb, dev, txq, next != NULL); |
7f2e870f DM |
3133 | if (unlikely(!dev_xmit_complete(rc))) { |
3134 | skb->next = next; | |
3135 | goto out; | |
3136 | } | |
6afff0ca | 3137 | |
7f2e870f DM |
3138 | skb = next; |
3139 | if (netif_xmit_stopped(txq) && skb) { | |
3140 | rc = NETDEV_TX_BUSY; | |
3141 | break; | |
9ccb8975 | 3142 | } |
7f2e870f | 3143 | } |
9ccb8975 | 3144 | |
7f2e870f DM |
3145 | out: |
3146 | *ret = rc; | |
3147 | return skb; | |
3148 | } | |
b40863c6 | 3149 | |
1ff0dc94 ED |
3150 | static struct sk_buff *validate_xmit_vlan(struct sk_buff *skb, |
3151 | netdev_features_t features) | |
f6a78bfc | 3152 | { |
df8a39de | 3153 | if (skb_vlan_tag_present(skb) && |
5968250c JP |
3154 | !vlan_hw_offload_capable(features, skb->vlan_proto)) |
3155 | skb = __vlan_hwaccel_push_inside(skb); | |
eae3f88e DM |
3156 | return skb; |
3157 | } | |
f6a78bfc | 3158 | |
43c26a1a DC |
3159 | int skb_csum_hwoffload_help(struct sk_buff *skb, |
3160 | const netdev_features_t features) | |
3161 | { | |
3162 | if (unlikely(skb->csum_not_inet)) | |
3163 | return !!(features & NETIF_F_SCTP_CRC) ? 0 : | |
3164 | skb_crc32c_csum_help(skb); | |
3165 | ||
3166 | return !!(features & NETIF_F_CSUM_MASK) ? 0 : skb_checksum_help(skb); | |
3167 | } | |
3168 | EXPORT_SYMBOL(skb_csum_hwoffload_help); | |
3169 | ||
f53c7239 | 3170 | static struct sk_buff *validate_xmit_skb(struct sk_buff *skb, struct net_device *dev, bool *again) |
eae3f88e DM |
3171 | { |
3172 | netdev_features_t features; | |
f6a78bfc | 3173 | |
eae3f88e DM |
3174 | features = netif_skb_features(skb); |
3175 | skb = validate_xmit_vlan(skb, features); | |
3176 | if (unlikely(!skb)) | |
3177 | goto out_null; | |
7b9c6090 | 3178 | |
ebf4e808 IL |
3179 | skb = sk_validate_xmit_skb(skb, dev); |
3180 | if (unlikely(!skb)) | |
3181 | goto out_null; | |
3182 | ||
8b86a61d | 3183 | if (netif_needs_gso(skb, features)) { |
ce93718f DM |
3184 | struct sk_buff *segs; |
3185 | ||
3186 | segs = skb_gso_segment(skb, features); | |
cecda693 | 3187 | if (IS_ERR(segs)) { |
af6dabc9 | 3188 | goto out_kfree_skb; |
cecda693 JW |
3189 | } else if (segs) { |
3190 | consume_skb(skb); | |
3191 | skb = segs; | |
f6a78bfc | 3192 | } |
eae3f88e DM |
3193 | } else { |
3194 | if (skb_needs_linearize(skb, features) && | |
3195 | __skb_linearize(skb)) | |
3196 | goto out_kfree_skb; | |
4ec93edb | 3197 | |
eae3f88e DM |
3198 | /* If packet is not checksummed and device does not |
3199 | * support checksumming for this protocol, complete | |
3200 | * checksumming here. | |
3201 | */ | |
3202 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
3203 | if (skb->encapsulation) | |
3204 | skb_set_inner_transport_header(skb, | |
3205 | skb_checksum_start_offset(skb)); | |
3206 | else | |
3207 | skb_set_transport_header(skb, | |
3208 | skb_checksum_start_offset(skb)); | |
43c26a1a | 3209 | if (skb_csum_hwoffload_help(skb, features)) |
eae3f88e | 3210 | goto out_kfree_skb; |
7b9c6090 | 3211 | } |
0c772159 | 3212 | } |
7b9c6090 | 3213 | |
f53c7239 | 3214 | skb = validate_xmit_xfrm(skb, features, again); |
3dca3f38 | 3215 | |
eae3f88e | 3216 | return skb; |
fc70fb64 | 3217 | |
f6a78bfc HX |
3218 | out_kfree_skb: |
3219 | kfree_skb(skb); | |
eae3f88e | 3220 | out_null: |
d21fd63e | 3221 | atomic_long_inc(&dev->tx_dropped); |
eae3f88e DM |
3222 | return NULL; |
3223 | } | |
6afff0ca | 3224 | |
f53c7239 | 3225 | struct sk_buff *validate_xmit_skb_list(struct sk_buff *skb, struct net_device *dev, bool *again) |
55a93b3e ED |
3226 | { |
3227 | struct sk_buff *next, *head = NULL, *tail; | |
3228 | ||
bec3cfdc | 3229 | for (; skb != NULL; skb = next) { |
55a93b3e ED |
3230 | next = skb->next; |
3231 | skb->next = NULL; | |
bec3cfdc ED |
3232 | |
3233 | /* in case skb wont be segmented, point to itself */ | |
3234 | skb->prev = skb; | |
3235 | ||
f53c7239 | 3236 | skb = validate_xmit_skb(skb, dev, again); |
bec3cfdc ED |
3237 | if (!skb) |
3238 | continue; | |
55a93b3e | 3239 | |
bec3cfdc ED |
3240 | if (!head) |
3241 | head = skb; | |
3242 | else | |
3243 | tail->next = skb; | |
3244 | /* If skb was segmented, skb->prev points to | |
3245 | * the last segment. If not, it still contains skb. | |
3246 | */ | |
3247 | tail = skb->prev; | |
55a93b3e ED |
3248 | } |
3249 | return head; | |
f6a78bfc | 3250 | } |
104ba78c | 3251 | EXPORT_SYMBOL_GPL(validate_xmit_skb_list); |
f6a78bfc | 3252 | |
1def9238 ED |
3253 | static void qdisc_pkt_len_init(struct sk_buff *skb) |
3254 | { | |
3255 | const struct skb_shared_info *shinfo = skb_shinfo(skb); | |
3256 | ||
3257 | qdisc_skb_cb(skb)->pkt_len = skb->len; | |
3258 | ||
3259 | /* To get more precise estimation of bytes sent on wire, | |
3260 | * we add to pkt_len the headers size of all segments | |
3261 | */ | |
3262 | if (shinfo->gso_size) { | |
757b8b1d | 3263 | unsigned int hdr_len; |
15e5a030 | 3264 | u16 gso_segs = shinfo->gso_segs; |
1def9238 | 3265 | |
757b8b1d ED |
3266 | /* mac layer + network layer */ |
3267 | hdr_len = skb_transport_header(skb) - skb_mac_header(skb); | |
3268 | ||
3269 | /* + transport layer */ | |
7c68d1a6 ED |
3270 | if (likely(shinfo->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6))) { |
3271 | const struct tcphdr *th; | |
3272 | struct tcphdr _tcphdr; | |
3273 | ||
3274 | th = skb_header_pointer(skb, skb_transport_offset(skb), | |
3275 | sizeof(_tcphdr), &_tcphdr); | |
3276 | if (likely(th)) | |
3277 | hdr_len += __tcp_hdrlen(th); | |
3278 | } else { | |
3279 | struct udphdr _udphdr; | |
3280 | ||
3281 | if (skb_header_pointer(skb, skb_transport_offset(skb), | |
3282 | sizeof(_udphdr), &_udphdr)) | |
3283 | hdr_len += sizeof(struct udphdr); | |
3284 | } | |
15e5a030 JW |
3285 | |
3286 | if (shinfo->gso_type & SKB_GSO_DODGY) | |
3287 | gso_segs = DIV_ROUND_UP(skb->len - hdr_len, | |
3288 | shinfo->gso_size); | |
3289 | ||
3290 | qdisc_skb_cb(skb)->pkt_len += (gso_segs - 1) * hdr_len; | |
1def9238 ED |
3291 | } |
3292 | } | |
3293 | ||
bbd8a0d3 KK |
3294 | static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q, |
3295 | struct net_device *dev, | |
3296 | struct netdev_queue *txq) | |
3297 | { | |
3298 | spinlock_t *root_lock = qdisc_lock(q); | |
520ac30f | 3299 | struct sk_buff *to_free = NULL; |
a2da570d | 3300 | bool contended; |
bbd8a0d3 KK |
3301 | int rc; |
3302 | ||
a2da570d | 3303 | qdisc_calculate_pkt_len(skb, q); |
6b3ba914 JF |
3304 | |
3305 | if (q->flags & TCQ_F_NOLOCK) { | |
3306 | if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) { | |
3307 | __qdisc_drop(skb, &to_free); | |
3308 | rc = NET_XMIT_DROP; | |
3309 | } else { | |
3310 | rc = q->enqueue(skb, q, &to_free) & NET_XMIT_MASK; | |
32f7b44d | 3311 | qdisc_run(q); |
6b3ba914 JF |
3312 | } |
3313 | ||
3314 | if (unlikely(to_free)) | |
3315 | kfree_skb_list(to_free); | |
3316 | return rc; | |
3317 | } | |
3318 | ||
79640a4c ED |
3319 | /* |
3320 | * Heuristic to force contended enqueues to serialize on a | |
3321 | * separate lock before trying to get qdisc main lock. | |
f9eb8aea | 3322 | * This permits qdisc->running owner to get the lock more |
9bf2b8c2 | 3323 | * often and dequeue packets faster. |
79640a4c | 3324 | */ |
a2da570d | 3325 | contended = qdisc_is_running(q); |
79640a4c ED |
3326 | if (unlikely(contended)) |
3327 | spin_lock(&q->busylock); | |
3328 | ||
bbd8a0d3 KK |
3329 | spin_lock(root_lock); |
3330 | if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) { | |
520ac30f | 3331 | __qdisc_drop(skb, &to_free); |
bbd8a0d3 KK |
3332 | rc = NET_XMIT_DROP; |
3333 | } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) && | |
bc135b23 | 3334 | qdisc_run_begin(q)) { |
bbd8a0d3 KK |
3335 | /* |
3336 | * This is a work-conserving queue; there are no old skbs | |
3337 | * waiting to be sent out; and the qdisc is not running - | |
3338 | * xmit the skb directly. | |
3339 | */ | |
bfe0d029 | 3340 | |
bfe0d029 ED |
3341 | qdisc_bstats_update(q, skb); |
3342 | ||
55a93b3e | 3343 | if (sch_direct_xmit(skb, q, dev, txq, root_lock, true)) { |
79640a4c ED |
3344 | if (unlikely(contended)) { |
3345 | spin_unlock(&q->busylock); | |
3346 | contended = false; | |
3347 | } | |
bbd8a0d3 | 3348 | __qdisc_run(q); |
6c148184 | 3349 | } |
bbd8a0d3 | 3350 | |
6c148184 | 3351 | qdisc_run_end(q); |
bbd8a0d3 KK |
3352 | rc = NET_XMIT_SUCCESS; |
3353 | } else { | |
520ac30f | 3354 | rc = q->enqueue(skb, q, &to_free) & NET_XMIT_MASK; |
79640a4c ED |
3355 | if (qdisc_run_begin(q)) { |
3356 | if (unlikely(contended)) { | |
3357 | spin_unlock(&q->busylock); | |
3358 | contended = false; | |
3359 | } | |
3360 | __qdisc_run(q); | |
6c148184 | 3361 | qdisc_run_end(q); |
79640a4c | 3362 | } |
bbd8a0d3 KK |
3363 | } |
3364 | spin_unlock(root_lock); | |
520ac30f ED |
3365 | if (unlikely(to_free)) |
3366 | kfree_skb_list(to_free); | |
79640a4c ED |
3367 | if (unlikely(contended)) |
3368 | spin_unlock(&q->busylock); | |
bbd8a0d3 KK |
3369 | return rc; |
3370 | } | |
3371 | ||
86f8515f | 3372 | #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO) |
5bc1421e NH |
3373 | static void skb_update_prio(struct sk_buff *skb) |
3374 | { | |
4dcb31d4 ED |
3375 | const struct netprio_map *map; |
3376 | const struct sock *sk; | |
3377 | unsigned int prioidx; | |
5bc1421e | 3378 | |
4dcb31d4 ED |
3379 | if (skb->priority) |
3380 | return; | |
3381 | map = rcu_dereference_bh(skb->dev->priomap); | |
3382 | if (!map) | |
3383 | return; | |
3384 | sk = skb_to_full_sk(skb); | |
3385 | if (!sk) | |
3386 | return; | |
91c68ce2 | 3387 | |
4dcb31d4 ED |
3388 | prioidx = sock_cgroup_prioidx(&sk->sk_cgrp_data); |
3389 | ||
3390 | if (prioidx < map->priomap_len) | |
3391 | skb->priority = map->priomap[prioidx]; | |
5bc1421e NH |
3392 | } |
3393 | #else | |
3394 | #define skb_update_prio(skb) | |
3395 | #endif | |
3396 | ||
f60e5990 | 3397 | DEFINE_PER_CPU(int, xmit_recursion); |
3398 | EXPORT_SYMBOL(xmit_recursion); | |
3399 | ||
95603e22 MM |
3400 | /** |
3401 | * dev_loopback_xmit - loop back @skb | |
0c4b51f0 EB |
3402 | * @net: network namespace this loopback is happening in |
3403 | * @sk: sk needed to be a netfilter okfn | |
95603e22 MM |
3404 | * @skb: buffer to transmit |
3405 | */ | |
0c4b51f0 | 3406 | int dev_loopback_xmit(struct net *net, struct sock *sk, struct sk_buff *skb) |
95603e22 MM |
3407 | { |
3408 | skb_reset_mac_header(skb); | |
3409 | __skb_pull(skb, skb_network_offset(skb)); | |
3410 | skb->pkt_type = PACKET_LOOPBACK; | |
3411 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
3412 | WARN_ON(!skb_dst(skb)); | |
3413 | skb_dst_force(skb); | |
3414 | netif_rx_ni(skb); | |
3415 | return 0; | |
3416 | } | |
3417 | EXPORT_SYMBOL(dev_loopback_xmit); | |
3418 | ||
1f211a1b DB |
3419 | #ifdef CONFIG_NET_EGRESS |
3420 | static struct sk_buff * | |
3421 | sch_handle_egress(struct sk_buff *skb, int *ret, struct net_device *dev) | |
3422 | { | |
46209401 | 3423 | struct mini_Qdisc *miniq = rcu_dereference_bh(dev->miniq_egress); |
1f211a1b DB |
3424 | struct tcf_result cl_res; |
3425 | ||
46209401 | 3426 | if (!miniq) |
1f211a1b DB |
3427 | return skb; |
3428 | ||
8dc07fdb | 3429 | /* qdisc_skb_cb(skb)->pkt_len was already set by the caller. */ |
46209401 | 3430 | mini_qdisc_bstats_cpu_update(miniq, skb); |
1f211a1b | 3431 | |
46209401 | 3432 | switch (tcf_classify(skb, miniq->filter_list, &cl_res, false)) { |
1f211a1b DB |
3433 | case TC_ACT_OK: |
3434 | case TC_ACT_RECLASSIFY: | |
3435 | skb->tc_index = TC_H_MIN(cl_res.classid); | |
3436 | break; | |
3437 | case TC_ACT_SHOT: | |
46209401 | 3438 | mini_qdisc_qstats_cpu_drop(miniq); |
1f211a1b | 3439 | *ret = NET_XMIT_DROP; |
7e2c3aea DB |
3440 | kfree_skb(skb); |
3441 | return NULL; | |
1f211a1b DB |
3442 | case TC_ACT_STOLEN: |
3443 | case TC_ACT_QUEUED: | |
e25ea21f | 3444 | case TC_ACT_TRAP: |
1f211a1b | 3445 | *ret = NET_XMIT_SUCCESS; |
7e2c3aea | 3446 | consume_skb(skb); |
1f211a1b DB |
3447 | return NULL; |
3448 | case TC_ACT_REDIRECT: | |
3449 | /* No need to push/pop skb's mac_header here on egress! */ | |
3450 | skb_do_redirect(skb); | |
3451 | *ret = NET_XMIT_SUCCESS; | |
3452 | return NULL; | |
3453 | default: | |
3454 | break; | |
3455 | } | |
3456 | ||
3457 | return skb; | |
3458 | } | |
3459 | #endif /* CONFIG_NET_EGRESS */ | |
3460 | ||
fc9bab24 AN |
3461 | #ifdef CONFIG_XPS |
3462 | static int __get_xps_queue_idx(struct net_device *dev, struct sk_buff *skb, | |
3463 | struct xps_dev_maps *dev_maps, unsigned int tci) | |
3464 | { | |
3465 | struct xps_map *map; | |
3466 | int queue_index = -1; | |
3467 | ||
3468 | if (dev->num_tc) { | |
3469 | tci *= dev->num_tc; | |
3470 | tci += netdev_get_prio_tc_map(dev, skb->priority); | |
3471 | } | |
3472 | ||
3473 | map = rcu_dereference(dev_maps->attr_map[tci]); | |
3474 | if (map) { | |
3475 | if (map->len == 1) | |
3476 | queue_index = map->queues[0]; | |
3477 | else | |
3478 | queue_index = map->queues[reciprocal_scale( | |
3479 | skb_get_hash(skb), map->len)]; | |
3480 | if (unlikely(queue_index >= dev->real_num_tx_queues)) | |
3481 | queue_index = -1; | |
3482 | } | |
3483 | return queue_index; | |
3484 | } | |
3485 | #endif | |
3486 | ||
3487 | static int get_xps_queue(struct net_device *dev, struct sk_buff *skb) | |
638b2a69 JP |
3488 | { |
3489 | #ifdef CONFIG_XPS | |
3490 | struct xps_dev_maps *dev_maps; | |
fc9bab24 | 3491 | struct sock *sk = skb->sk; |
638b2a69 JP |
3492 | int queue_index = -1; |
3493 | ||
04157469 AN |
3494 | if (!static_key_false(&xps_needed)) |
3495 | return -1; | |
3496 | ||
638b2a69 | 3497 | rcu_read_lock(); |
fc9bab24 AN |
3498 | if (!static_key_false(&xps_rxqs_needed)) |
3499 | goto get_cpus_map; | |
3500 | ||
3501 | dev_maps = rcu_dereference(dev->xps_rxqs_map); | |
638b2a69 | 3502 | if (dev_maps) { |
fc9bab24 | 3503 | int tci = sk_rx_queue_get(sk); |
184c449f | 3504 | |
fc9bab24 AN |
3505 | if (tci >= 0 && tci < dev->num_rx_queues) |
3506 | queue_index = __get_xps_queue_idx(dev, skb, dev_maps, | |
3507 | tci); | |
3508 | } | |
184c449f | 3509 | |
fc9bab24 AN |
3510 | get_cpus_map: |
3511 | if (queue_index < 0) { | |
3512 | dev_maps = rcu_dereference(dev->xps_cpus_map); | |
3513 | if (dev_maps) { | |
3514 | unsigned int tci = skb->sender_cpu - 1; | |
3515 | ||
3516 | queue_index = __get_xps_queue_idx(dev, skb, dev_maps, | |
3517 | tci); | |
638b2a69 JP |
3518 | } |
3519 | } | |
3520 | rcu_read_unlock(); | |
3521 | ||
3522 | return queue_index; | |
3523 | #else | |
3524 | return -1; | |
3525 | #endif | |
3526 | } | |
3527 | ||
3528 | static u16 __netdev_pick_tx(struct net_device *dev, struct sk_buff *skb) | |
3529 | { | |
3530 | struct sock *sk = skb->sk; | |
3531 | int queue_index = sk_tx_queue_get(sk); | |
3532 | ||
3533 | if (queue_index < 0 || skb->ooo_okay || | |
3534 | queue_index >= dev->real_num_tx_queues) { | |
3535 | int new_index = get_xps_queue(dev, skb); | |
f4563a75 | 3536 | |
638b2a69 JP |
3537 | if (new_index < 0) |
3538 | new_index = skb_tx_hash(dev, skb); | |
3539 | ||
3540 | if (queue_index != new_index && sk && | |
004a5d01 | 3541 | sk_fullsock(sk) && |
638b2a69 JP |
3542 | rcu_access_pointer(sk->sk_dst_cache)) |
3543 | sk_tx_queue_set(sk, new_index); | |
3544 | ||
3545 | queue_index = new_index; | |
3546 | } | |
3547 | ||
3548 | return queue_index; | |
3549 | } | |
3550 | ||
3551 | struct netdev_queue *netdev_pick_tx(struct net_device *dev, | |
3552 | struct sk_buff *skb, | |
3553 | void *accel_priv) | |
3554 | { | |
3555 | int queue_index = 0; | |
3556 | ||
3557 | #ifdef CONFIG_XPS | |
52bd2d62 ED |
3558 | u32 sender_cpu = skb->sender_cpu - 1; |
3559 | ||
3560 | if (sender_cpu >= (u32)NR_CPUS) | |
638b2a69 JP |
3561 | skb->sender_cpu = raw_smp_processor_id() + 1; |
3562 | #endif | |
3563 | ||
3564 | if (dev->real_num_tx_queues != 1) { | |
3565 | const struct net_device_ops *ops = dev->netdev_ops; | |
f4563a75 | 3566 | |
638b2a69 JP |
3567 | if (ops->ndo_select_queue) |
3568 | queue_index = ops->ndo_select_queue(dev, skb, accel_priv, | |
3569 | __netdev_pick_tx); | |
3570 | else | |
3571 | queue_index = __netdev_pick_tx(dev, skb); | |
3572 | ||
d584527c | 3573 | queue_index = netdev_cap_txqueue(dev, queue_index); |
638b2a69 JP |
3574 | } |
3575 | ||
3576 | skb_set_queue_mapping(skb, queue_index); | |
3577 | return netdev_get_tx_queue(dev, queue_index); | |
3578 | } | |
3579 | ||
d29f749e | 3580 | /** |
9d08dd3d | 3581 | * __dev_queue_xmit - transmit a buffer |
d29f749e | 3582 | * @skb: buffer to transmit |
9d08dd3d | 3583 | * @accel_priv: private data used for L2 forwarding offload |
d29f749e DJ |
3584 | * |
3585 | * Queue a buffer for transmission to a network device. The caller must | |
3586 | * have set the device and priority and built the buffer before calling | |
3587 | * this function. The function can be called from an interrupt. | |
3588 | * | |
3589 | * A negative errno code is returned on a failure. A success does not | |
3590 | * guarantee the frame will be transmitted as it may be dropped due | |
3591 | * to congestion or traffic shaping. | |
3592 | * | |
3593 | * ----------------------------------------------------------------------------------- | |
3594 | * I notice this method can also return errors from the queue disciplines, | |
3595 | * including NET_XMIT_DROP, which is a positive value. So, errors can also | |
3596 | * be positive. | |
3597 | * | |
3598 | * Regardless of the return value, the skb is consumed, so it is currently | |
3599 | * difficult to retry a send to this method. (You can bump the ref count | |
3600 | * before sending to hold a reference for retry if you are careful.) | |
3601 | * | |
3602 | * When calling this method, interrupts MUST be enabled. This is because | |
3603 | * the BH enable code must have IRQs enabled so that it will not deadlock. | |
3604 | * --BLG | |
3605 | */ | |
0a59f3a9 | 3606 | static int __dev_queue_xmit(struct sk_buff *skb, void *accel_priv) |
1da177e4 LT |
3607 | { |
3608 | struct net_device *dev = skb->dev; | |
dc2b4847 | 3609 | struct netdev_queue *txq; |
1da177e4 LT |
3610 | struct Qdisc *q; |
3611 | int rc = -ENOMEM; | |
f53c7239 | 3612 | bool again = false; |
1da177e4 | 3613 | |
6d1ccff6 ED |
3614 | skb_reset_mac_header(skb); |
3615 | ||
e7fd2885 WB |
3616 | if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_SCHED_TSTAMP)) |
3617 | __skb_tstamp_tx(skb, NULL, skb->sk, SCM_TSTAMP_SCHED); | |
3618 | ||
4ec93edb YH |
3619 | /* Disable soft irqs for various locks below. Also |
3620 | * stops preemption for RCU. | |
1da177e4 | 3621 | */ |
4ec93edb | 3622 | rcu_read_lock_bh(); |
1da177e4 | 3623 | |
5bc1421e NH |
3624 | skb_update_prio(skb); |
3625 | ||
1f211a1b DB |
3626 | qdisc_pkt_len_init(skb); |
3627 | #ifdef CONFIG_NET_CLS_ACT | |
8dc07fdb | 3628 | skb->tc_at_ingress = 0; |
1f211a1b | 3629 | # ifdef CONFIG_NET_EGRESS |
aabf6772 | 3630 | if (static_branch_unlikely(&egress_needed_key)) { |
1f211a1b DB |
3631 | skb = sch_handle_egress(skb, &rc, dev); |
3632 | if (!skb) | |
3633 | goto out; | |
3634 | } | |
3635 | # endif | |
3636 | #endif | |
02875878 ED |
3637 | /* If device/qdisc don't need skb->dst, release it right now while |
3638 | * its hot in this cpu cache. | |
3639 | */ | |
3640 | if (dev->priv_flags & IFF_XMIT_DST_RELEASE) | |
3641 | skb_dst_drop(skb); | |
3642 | else | |
3643 | skb_dst_force(skb); | |
3644 | ||
f663dd9a | 3645 | txq = netdev_pick_tx(dev, skb, accel_priv); |
a898def2 | 3646 | q = rcu_dereference_bh(txq->qdisc); |
37437bb2 | 3647 | |
cf66ba58 | 3648 | trace_net_dev_queue(skb); |
1da177e4 | 3649 | if (q->enqueue) { |
bbd8a0d3 | 3650 | rc = __dev_xmit_skb(skb, q, dev, txq); |
37437bb2 | 3651 | goto out; |
1da177e4 LT |
3652 | } |
3653 | ||
3654 | /* The device has no queue. Common case for software devices: | |
eb13da1a | 3655 | * loopback, all the sorts of tunnels... |
1da177e4 | 3656 | |
eb13da1a | 3657 | * Really, it is unlikely that netif_tx_lock protection is necessary |
3658 | * here. (f.e. loopback and IP tunnels are clean ignoring statistics | |
3659 | * counters.) | |
3660 | * However, it is possible, that they rely on protection | |
3661 | * made by us here. | |
1da177e4 | 3662 | |
eb13da1a | 3663 | * Check this and shot the lock. It is not prone from deadlocks. |
3664 | *Either shot noqueue qdisc, it is even simpler 8) | |
1da177e4 LT |
3665 | */ |
3666 | if (dev->flags & IFF_UP) { | |
3667 | int cpu = smp_processor_id(); /* ok because BHs are off */ | |
3668 | ||
c773e847 | 3669 | if (txq->xmit_lock_owner != cpu) { |
a70b506e DB |
3670 | if (unlikely(__this_cpu_read(xmit_recursion) > |
3671 | XMIT_RECURSION_LIMIT)) | |
745e20f1 ED |
3672 | goto recursion_alert; |
3673 | ||
f53c7239 | 3674 | skb = validate_xmit_skb(skb, dev, &again); |
1f59533f | 3675 | if (!skb) |
d21fd63e | 3676 | goto out; |
1f59533f | 3677 | |
c773e847 | 3678 | HARD_TX_LOCK(dev, txq, cpu); |
1da177e4 | 3679 | |
73466498 | 3680 | if (!netif_xmit_stopped(txq)) { |
745e20f1 | 3681 | __this_cpu_inc(xmit_recursion); |
ce93718f | 3682 | skb = dev_hard_start_xmit(skb, dev, txq, &rc); |
745e20f1 | 3683 | __this_cpu_dec(xmit_recursion); |
572a9d7b | 3684 | if (dev_xmit_complete(rc)) { |
c773e847 | 3685 | HARD_TX_UNLOCK(dev, txq); |
1da177e4 LT |
3686 | goto out; |
3687 | } | |
3688 | } | |
c773e847 | 3689 | HARD_TX_UNLOCK(dev, txq); |
e87cc472 JP |
3690 | net_crit_ratelimited("Virtual device %s asks to queue packet!\n", |
3691 | dev->name); | |
1da177e4 LT |
3692 | } else { |
3693 | /* Recursion is detected! It is possible, | |
745e20f1 ED |
3694 | * unfortunately |
3695 | */ | |
3696 | recursion_alert: | |
e87cc472 JP |
3697 | net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n", |
3698 | dev->name); | |
1da177e4 LT |
3699 | } |
3700 | } | |
3701 | ||
3702 | rc = -ENETDOWN; | |
d4828d85 | 3703 | rcu_read_unlock_bh(); |
1da177e4 | 3704 | |
015f0688 | 3705 | atomic_long_inc(&dev->tx_dropped); |
1f59533f | 3706 | kfree_skb_list(skb); |
1da177e4 LT |
3707 | return rc; |
3708 | out: | |
d4828d85 | 3709 | rcu_read_unlock_bh(); |
1da177e4 LT |
3710 | return rc; |
3711 | } | |
f663dd9a | 3712 | |
2b4aa3ce | 3713 | int dev_queue_xmit(struct sk_buff *skb) |
f663dd9a JW |
3714 | { |
3715 | return __dev_queue_xmit(skb, NULL); | |
3716 | } | |
2b4aa3ce | 3717 | EXPORT_SYMBOL(dev_queue_xmit); |
1da177e4 | 3718 | |
f663dd9a JW |
3719 | int dev_queue_xmit_accel(struct sk_buff *skb, void *accel_priv) |
3720 | { | |
3721 | return __dev_queue_xmit(skb, accel_priv); | |
3722 | } | |
3723 | EXPORT_SYMBOL(dev_queue_xmit_accel); | |
3724 | ||
865b03f2 MK |
3725 | int dev_direct_xmit(struct sk_buff *skb, u16 queue_id) |
3726 | { | |
3727 | struct net_device *dev = skb->dev; | |
3728 | struct sk_buff *orig_skb = skb; | |
3729 | struct netdev_queue *txq; | |
3730 | int ret = NETDEV_TX_BUSY; | |
3731 | bool again = false; | |
3732 | ||
3733 | if (unlikely(!netif_running(dev) || | |
3734 | !netif_carrier_ok(dev))) | |
3735 | goto drop; | |
3736 | ||
3737 | skb = validate_xmit_skb_list(skb, dev, &again); | |
3738 | if (skb != orig_skb) | |
3739 | goto drop; | |
3740 | ||
3741 | skb_set_queue_mapping(skb, queue_id); | |
3742 | txq = skb_get_tx_queue(dev, skb); | |
3743 | ||
3744 | local_bh_disable(); | |
3745 | ||
3746 | HARD_TX_LOCK(dev, txq, smp_processor_id()); | |
3747 | if (!netif_xmit_frozen_or_drv_stopped(txq)) | |
3748 | ret = netdev_start_xmit(skb, dev, txq, false); | |
3749 | HARD_TX_UNLOCK(dev, txq); | |
3750 | ||
3751 | local_bh_enable(); | |
3752 | ||
3753 | if (!dev_xmit_complete(ret)) | |
3754 | kfree_skb(skb); | |
3755 | ||
3756 | return ret; | |
3757 | drop: | |
3758 | atomic_long_inc(&dev->tx_dropped); | |
3759 | kfree_skb_list(skb); | |
3760 | return NET_XMIT_DROP; | |
3761 | } | |
3762 | EXPORT_SYMBOL(dev_direct_xmit); | |
1da177e4 | 3763 | |
eb13da1a | 3764 | /************************************************************************* |
3765 | * Receiver routines | |
3766 | *************************************************************************/ | |
1da177e4 | 3767 | |
6b2bedc3 | 3768 | int netdev_max_backlog __read_mostly = 1000; |
c9e6bc64 ED |
3769 | EXPORT_SYMBOL(netdev_max_backlog); |
3770 | ||
3b098e2d | 3771 | int netdev_tstamp_prequeue __read_mostly = 1; |
6b2bedc3 | 3772 | int netdev_budget __read_mostly = 300; |
7acf8a1e | 3773 | unsigned int __read_mostly netdev_budget_usecs = 2000; |
3d48b53f MT |
3774 | int weight_p __read_mostly = 64; /* old backlog weight */ |
3775 | int dev_weight_rx_bias __read_mostly = 1; /* bias for backlog weight */ | |
3776 | int dev_weight_tx_bias __read_mostly = 1; /* bias for output_queue quota */ | |
3777 | int dev_rx_weight __read_mostly = 64; | |
3778 | int dev_tx_weight __read_mostly = 64; | |
1da177e4 | 3779 | |
eecfd7c4 ED |
3780 | /* Called with irq disabled */ |
3781 | static inline void ____napi_schedule(struct softnet_data *sd, | |
3782 | struct napi_struct *napi) | |
3783 | { | |
3784 | list_add_tail(&napi->poll_list, &sd->poll_list); | |
3785 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); | |
3786 | } | |
3787 | ||
bfb564e7 KK |
3788 | #ifdef CONFIG_RPS |
3789 | ||
3790 | /* One global table that all flow-based protocols share. */ | |
6e3f7faf | 3791 | struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly; |
bfb564e7 | 3792 | EXPORT_SYMBOL(rps_sock_flow_table); |
567e4b79 ED |
3793 | u32 rps_cpu_mask __read_mostly; |
3794 | EXPORT_SYMBOL(rps_cpu_mask); | |
bfb564e7 | 3795 | |
c5905afb | 3796 | struct static_key rps_needed __read_mostly; |
3df97ba8 | 3797 | EXPORT_SYMBOL(rps_needed); |
13bfff25 ED |
3798 | struct static_key rfs_needed __read_mostly; |
3799 | EXPORT_SYMBOL(rfs_needed); | |
adc9300e | 3800 | |
c445477d BH |
3801 | static struct rps_dev_flow * |
3802 | set_rps_cpu(struct net_device *dev, struct sk_buff *skb, | |
3803 | struct rps_dev_flow *rflow, u16 next_cpu) | |
3804 | { | |
a31196b0 | 3805 | if (next_cpu < nr_cpu_ids) { |
c445477d BH |
3806 | #ifdef CONFIG_RFS_ACCEL |
3807 | struct netdev_rx_queue *rxqueue; | |
3808 | struct rps_dev_flow_table *flow_table; | |
3809 | struct rps_dev_flow *old_rflow; | |
3810 | u32 flow_id; | |
3811 | u16 rxq_index; | |
3812 | int rc; | |
3813 | ||
3814 | /* Should we steer this flow to a different hardware queue? */ | |
69a19ee6 BH |
3815 | if (!skb_rx_queue_recorded(skb) || !dev->rx_cpu_rmap || |
3816 | !(dev->features & NETIF_F_NTUPLE)) | |
c445477d BH |
3817 | goto out; |
3818 | rxq_index = cpu_rmap_lookup_index(dev->rx_cpu_rmap, next_cpu); | |
3819 | if (rxq_index == skb_get_rx_queue(skb)) | |
3820 | goto out; | |
3821 | ||
3822 | rxqueue = dev->_rx + rxq_index; | |
3823 | flow_table = rcu_dereference(rxqueue->rps_flow_table); | |
3824 | if (!flow_table) | |
3825 | goto out; | |
61b905da | 3826 | flow_id = skb_get_hash(skb) & flow_table->mask; |
c445477d BH |
3827 | rc = dev->netdev_ops->ndo_rx_flow_steer(dev, skb, |
3828 | rxq_index, flow_id); | |
3829 | if (rc < 0) | |
3830 | goto out; | |
3831 | old_rflow = rflow; | |
3832 | rflow = &flow_table->flows[flow_id]; | |
c445477d BH |
3833 | rflow->filter = rc; |
3834 | if (old_rflow->filter == rflow->filter) | |
3835 | old_rflow->filter = RPS_NO_FILTER; | |
3836 | out: | |
3837 | #endif | |
3838 | rflow->last_qtail = | |
09994d1b | 3839 | per_cpu(softnet_data, next_cpu).input_queue_head; |
c445477d BH |
3840 | } |
3841 | ||
09994d1b | 3842 | rflow->cpu = next_cpu; |
c445477d BH |
3843 | return rflow; |
3844 | } | |
3845 | ||
bfb564e7 KK |
3846 | /* |
3847 | * get_rps_cpu is called from netif_receive_skb and returns the target | |
3848 | * CPU from the RPS map of the receiving queue for a given skb. | |
3849 | * rcu_read_lock must be held on entry. | |
3850 | */ | |
3851 | static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb, | |
3852 | struct rps_dev_flow **rflowp) | |
3853 | { | |
567e4b79 ED |
3854 | const struct rps_sock_flow_table *sock_flow_table; |
3855 | struct netdev_rx_queue *rxqueue = dev->_rx; | |
bfb564e7 | 3856 | struct rps_dev_flow_table *flow_table; |
567e4b79 | 3857 | struct rps_map *map; |
bfb564e7 | 3858 | int cpu = -1; |
567e4b79 | 3859 | u32 tcpu; |
61b905da | 3860 | u32 hash; |
bfb564e7 KK |
3861 | |
3862 | if (skb_rx_queue_recorded(skb)) { | |
3863 | u16 index = skb_get_rx_queue(skb); | |
567e4b79 | 3864 | |
62fe0b40 BH |
3865 | if (unlikely(index >= dev->real_num_rx_queues)) { |
3866 | WARN_ONCE(dev->real_num_rx_queues > 1, | |
3867 | "%s received packet on queue %u, but number " | |
3868 | "of RX queues is %u\n", | |
3869 | dev->name, index, dev->real_num_rx_queues); | |
bfb564e7 KK |
3870 | goto done; |
3871 | } | |
567e4b79 ED |
3872 | rxqueue += index; |
3873 | } | |
bfb564e7 | 3874 | |
567e4b79 ED |
3875 | /* Avoid computing hash if RFS/RPS is not active for this rxqueue */ |
3876 | ||
3877 | flow_table = rcu_dereference(rxqueue->rps_flow_table); | |
6e3f7faf | 3878 | map = rcu_dereference(rxqueue->rps_map); |
567e4b79 | 3879 | if (!flow_table && !map) |
bfb564e7 KK |
3880 | goto done; |
3881 | ||
2d47b459 | 3882 | skb_reset_network_header(skb); |
61b905da TH |
3883 | hash = skb_get_hash(skb); |
3884 | if (!hash) | |
bfb564e7 KK |
3885 | goto done; |
3886 | ||
fec5e652 TH |
3887 | sock_flow_table = rcu_dereference(rps_sock_flow_table); |
3888 | if (flow_table && sock_flow_table) { | |
fec5e652 | 3889 | struct rps_dev_flow *rflow; |
567e4b79 ED |
3890 | u32 next_cpu; |
3891 | u32 ident; | |
3892 | ||
3893 | /* First check into global flow table if there is a match */ | |
3894 | ident = sock_flow_table->ents[hash & sock_flow_table->mask]; | |
3895 | if ((ident ^ hash) & ~rps_cpu_mask) | |
3896 | goto try_rps; | |
fec5e652 | 3897 | |
567e4b79 ED |
3898 | next_cpu = ident & rps_cpu_mask; |
3899 | ||
3900 | /* OK, now we know there is a match, | |
3901 | * we can look at the local (per receive queue) flow table | |
3902 | */ | |
61b905da | 3903 | rflow = &flow_table->flows[hash & flow_table->mask]; |
fec5e652 TH |
3904 | tcpu = rflow->cpu; |
3905 | ||
fec5e652 TH |
3906 | /* |
3907 | * If the desired CPU (where last recvmsg was done) is | |
3908 | * different from current CPU (one in the rx-queue flow | |
3909 | * table entry), switch if one of the following holds: | |
a31196b0 | 3910 | * - Current CPU is unset (>= nr_cpu_ids). |
fec5e652 TH |
3911 | * - Current CPU is offline. |
3912 | * - The current CPU's queue tail has advanced beyond the | |
3913 | * last packet that was enqueued using this table entry. | |
3914 | * This guarantees that all previous packets for the flow | |
3915 | * have been dequeued, thus preserving in order delivery. | |
3916 | */ | |
3917 | if (unlikely(tcpu != next_cpu) && | |
a31196b0 | 3918 | (tcpu >= nr_cpu_ids || !cpu_online(tcpu) || |
fec5e652 | 3919 | ((int)(per_cpu(softnet_data, tcpu).input_queue_head - |
baefa31d TH |
3920 | rflow->last_qtail)) >= 0)) { |
3921 | tcpu = next_cpu; | |
c445477d | 3922 | rflow = set_rps_cpu(dev, skb, rflow, next_cpu); |
baefa31d | 3923 | } |
c445477d | 3924 | |
a31196b0 | 3925 | if (tcpu < nr_cpu_ids && cpu_online(tcpu)) { |
fec5e652 TH |
3926 | *rflowp = rflow; |
3927 | cpu = tcpu; | |
3928 | goto done; | |
3929 | } | |
3930 | } | |
3931 | ||
567e4b79 ED |
3932 | try_rps: |
3933 | ||
0a9627f2 | 3934 | if (map) { |
8fc54f68 | 3935 | tcpu = map->cpus[reciprocal_scale(hash, map->len)]; |
0a9627f2 TH |
3936 | if (cpu_online(tcpu)) { |
3937 | cpu = tcpu; | |
3938 | goto done; | |
3939 | } | |
3940 | } | |
3941 | ||
3942 | done: | |
0a9627f2 TH |
3943 | return cpu; |
3944 | } | |
3945 | ||
c445477d BH |
3946 | #ifdef CONFIG_RFS_ACCEL |
3947 | ||
3948 | /** | |
3949 | * rps_may_expire_flow - check whether an RFS hardware filter may be removed | |
3950 | * @dev: Device on which the filter was set | |
3951 | * @rxq_index: RX queue index | |
3952 | * @flow_id: Flow ID passed to ndo_rx_flow_steer() | |
3953 | * @filter_id: Filter ID returned by ndo_rx_flow_steer() | |
3954 | * | |
3955 | * Drivers that implement ndo_rx_flow_steer() should periodically call | |
3956 | * this function for each installed filter and remove the filters for | |
3957 | * which it returns %true. | |
3958 | */ | |
3959 | bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index, | |
3960 | u32 flow_id, u16 filter_id) | |
3961 | { | |
3962 | struct netdev_rx_queue *rxqueue = dev->_rx + rxq_index; | |
3963 | struct rps_dev_flow_table *flow_table; | |
3964 | struct rps_dev_flow *rflow; | |
3965 | bool expire = true; | |
a31196b0 | 3966 | unsigned int cpu; |
c445477d BH |
3967 | |
3968 | rcu_read_lock(); | |
3969 | flow_table = rcu_dereference(rxqueue->rps_flow_table); | |
3970 | if (flow_table && flow_id <= flow_table->mask) { | |
3971 | rflow = &flow_table->flows[flow_id]; | |
6aa7de05 | 3972 | cpu = READ_ONCE(rflow->cpu); |
a31196b0 | 3973 | if (rflow->filter == filter_id && cpu < nr_cpu_ids && |
c445477d BH |
3974 | ((int)(per_cpu(softnet_data, cpu).input_queue_head - |
3975 | rflow->last_qtail) < | |
3976 | (int)(10 * flow_table->mask))) | |
3977 | expire = false; | |
3978 | } | |
3979 | rcu_read_unlock(); | |
3980 | return expire; | |
3981 | } | |
3982 | EXPORT_SYMBOL(rps_may_expire_flow); | |
3983 | ||
3984 | #endif /* CONFIG_RFS_ACCEL */ | |
3985 | ||
0a9627f2 | 3986 | /* Called from hardirq (IPI) context */ |
e36fa2f7 | 3987 | static void rps_trigger_softirq(void *data) |
0a9627f2 | 3988 | { |
e36fa2f7 ED |
3989 | struct softnet_data *sd = data; |
3990 | ||
eecfd7c4 | 3991 | ____napi_schedule(sd, &sd->backlog); |
dee42870 | 3992 | sd->received_rps++; |
0a9627f2 | 3993 | } |
e36fa2f7 | 3994 | |
fec5e652 | 3995 | #endif /* CONFIG_RPS */ |
0a9627f2 | 3996 | |
e36fa2f7 ED |
3997 | /* |
3998 | * Check if this softnet_data structure is another cpu one | |
3999 | * If yes, queue it to our IPI list and return 1 | |
4000 | * If no, return 0 | |
4001 | */ | |
4002 | static int rps_ipi_queued(struct softnet_data *sd) | |
4003 | { | |
4004 | #ifdef CONFIG_RPS | |
903ceff7 | 4005 | struct softnet_data *mysd = this_cpu_ptr(&softnet_data); |
e36fa2f7 ED |
4006 | |
4007 | if (sd != mysd) { | |
4008 | sd->rps_ipi_next = mysd->rps_ipi_list; | |
4009 | mysd->rps_ipi_list = sd; | |
4010 | ||
4011 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); | |
4012 | return 1; | |
4013 | } | |
4014 | #endif /* CONFIG_RPS */ | |
4015 | return 0; | |
4016 | } | |
4017 | ||
99bbc707 WB |
4018 | #ifdef CONFIG_NET_FLOW_LIMIT |
4019 | int netdev_flow_limit_table_len __read_mostly = (1 << 12); | |
4020 | #endif | |
4021 | ||
4022 | static bool skb_flow_limit(struct sk_buff *skb, unsigned int qlen) | |
4023 | { | |
4024 | #ifdef CONFIG_NET_FLOW_LIMIT | |
4025 | struct sd_flow_limit *fl; | |
4026 | struct softnet_data *sd; | |
4027 | unsigned int old_flow, new_flow; | |
4028 | ||
4029 | if (qlen < (netdev_max_backlog >> 1)) | |
4030 | return false; | |
4031 | ||
903ceff7 | 4032 | sd = this_cpu_ptr(&softnet_data); |
99bbc707 WB |
4033 | |
4034 | rcu_read_lock(); | |
4035 | fl = rcu_dereference(sd->flow_limit); | |
4036 | if (fl) { | |
3958afa1 | 4037 | new_flow = skb_get_hash(skb) & (fl->num_buckets - 1); |
99bbc707 WB |
4038 | old_flow = fl->history[fl->history_head]; |
4039 | fl->history[fl->history_head] = new_flow; | |
4040 | ||
4041 | fl->history_head++; | |
4042 | fl->history_head &= FLOW_LIMIT_HISTORY - 1; | |
4043 | ||
4044 | if (likely(fl->buckets[old_flow])) | |
4045 | fl->buckets[old_flow]--; | |
4046 | ||
4047 | if (++fl->buckets[new_flow] > (FLOW_LIMIT_HISTORY >> 1)) { | |
4048 | fl->count++; | |
4049 | rcu_read_unlock(); | |
4050 | return true; | |
4051 | } | |
4052 | } | |
4053 | rcu_read_unlock(); | |
4054 | #endif | |
4055 | return false; | |
4056 | } | |
4057 | ||
0a9627f2 TH |
4058 | /* |
4059 | * enqueue_to_backlog is called to queue an skb to a per CPU backlog | |
4060 | * queue (may be a remote CPU queue). | |
4061 | */ | |
fec5e652 TH |
4062 | static int enqueue_to_backlog(struct sk_buff *skb, int cpu, |
4063 | unsigned int *qtail) | |
0a9627f2 | 4064 | { |
e36fa2f7 | 4065 | struct softnet_data *sd; |
0a9627f2 | 4066 | unsigned long flags; |
99bbc707 | 4067 | unsigned int qlen; |
0a9627f2 | 4068 | |
e36fa2f7 | 4069 | sd = &per_cpu(softnet_data, cpu); |
0a9627f2 TH |
4070 | |
4071 | local_irq_save(flags); | |
0a9627f2 | 4072 | |
e36fa2f7 | 4073 | rps_lock(sd); |
e9e4dd32 JA |
4074 | if (!netif_running(skb->dev)) |
4075 | goto drop; | |
99bbc707 WB |
4076 | qlen = skb_queue_len(&sd->input_pkt_queue); |
4077 | if (qlen <= netdev_max_backlog && !skb_flow_limit(skb, qlen)) { | |
e008f3f0 | 4078 | if (qlen) { |
0a9627f2 | 4079 | enqueue: |
e36fa2f7 | 4080 | __skb_queue_tail(&sd->input_pkt_queue, skb); |
76cc8b13 | 4081 | input_queue_tail_incr_save(sd, qtail); |
e36fa2f7 | 4082 | rps_unlock(sd); |
152102c7 | 4083 | local_irq_restore(flags); |
0a9627f2 TH |
4084 | return NET_RX_SUCCESS; |
4085 | } | |
4086 | ||
ebda37c2 ED |
4087 | /* Schedule NAPI for backlog device |
4088 | * We can use non atomic operation since we own the queue lock | |
4089 | */ | |
4090 | if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) { | |
e36fa2f7 | 4091 | if (!rps_ipi_queued(sd)) |
eecfd7c4 | 4092 | ____napi_schedule(sd, &sd->backlog); |
0a9627f2 TH |
4093 | } |
4094 | goto enqueue; | |
4095 | } | |
4096 | ||
e9e4dd32 | 4097 | drop: |
dee42870 | 4098 | sd->dropped++; |
e36fa2f7 | 4099 | rps_unlock(sd); |
0a9627f2 | 4100 | |
0a9627f2 TH |
4101 | local_irq_restore(flags); |
4102 | ||
caf586e5 | 4103 | atomic_long_inc(&skb->dev->rx_dropped); |
0a9627f2 TH |
4104 | kfree_skb(skb); |
4105 | return NET_RX_DROP; | |
4106 | } | |
1da177e4 | 4107 | |
e817f856 JDB |
4108 | static struct netdev_rx_queue *netif_get_rxqueue(struct sk_buff *skb) |
4109 | { | |
4110 | struct net_device *dev = skb->dev; | |
4111 | struct netdev_rx_queue *rxqueue; | |
4112 | ||
4113 | rxqueue = dev->_rx; | |
4114 | ||
4115 | if (skb_rx_queue_recorded(skb)) { | |
4116 | u16 index = skb_get_rx_queue(skb); | |
4117 | ||
4118 | if (unlikely(index >= dev->real_num_rx_queues)) { | |
4119 | WARN_ONCE(dev->real_num_rx_queues > 1, | |
4120 | "%s received packet on queue %u, but number " | |
4121 | "of RX queues is %u\n", | |
4122 | dev->name, index, dev->real_num_rx_queues); | |
4123 | ||
4124 | return rxqueue; /* Return first rxqueue */ | |
4125 | } | |
4126 | rxqueue += index; | |
4127 | } | |
4128 | return rxqueue; | |
4129 | } | |
4130 | ||
d4455169 | 4131 | static u32 netif_receive_generic_xdp(struct sk_buff *skb, |
02671e23 | 4132 | struct xdp_buff *xdp, |
d4455169 JF |
4133 | struct bpf_prog *xdp_prog) |
4134 | { | |
e817f856 | 4135 | struct netdev_rx_queue *rxqueue; |
198d83bb | 4136 | void *orig_data, *orig_data_end; |
de8f3a83 | 4137 | u32 metalen, act = XDP_DROP; |
d4455169 JF |
4138 | int hlen, off; |
4139 | u32 mac_len; | |
4140 | ||
4141 | /* Reinjected packets coming from act_mirred or similar should | |
4142 | * not get XDP generic processing. | |
4143 | */ | |
4144 | if (skb_cloned(skb)) | |
4145 | return XDP_PASS; | |
4146 | ||
de8f3a83 DB |
4147 | /* XDP packets must be linear and must have sufficient headroom |
4148 | * of XDP_PACKET_HEADROOM bytes. This is the guarantee that also | |
4149 | * native XDP provides, thus we need to do it here as well. | |
4150 | */ | |
4151 | if (skb_is_nonlinear(skb) || | |
4152 | skb_headroom(skb) < XDP_PACKET_HEADROOM) { | |
4153 | int hroom = XDP_PACKET_HEADROOM - skb_headroom(skb); | |
4154 | int troom = skb->tail + skb->data_len - skb->end; | |
4155 | ||
4156 | /* In case we have to go down the path and also linearize, | |
4157 | * then lets do the pskb_expand_head() work just once here. | |
4158 | */ | |
4159 | if (pskb_expand_head(skb, | |
4160 | hroom > 0 ? ALIGN(hroom, NET_SKB_PAD) : 0, | |
4161 | troom > 0 ? troom + 128 : 0, GFP_ATOMIC)) | |
4162 | goto do_drop; | |
2d17d8d7 | 4163 | if (skb_linearize(skb)) |
de8f3a83 DB |
4164 | goto do_drop; |
4165 | } | |
d4455169 JF |
4166 | |
4167 | /* The XDP program wants to see the packet starting at the MAC | |
4168 | * header. | |
4169 | */ | |
4170 | mac_len = skb->data - skb_mac_header(skb); | |
4171 | hlen = skb_headlen(skb) + mac_len; | |
02671e23 BT |
4172 | xdp->data = skb->data - mac_len; |
4173 | xdp->data_meta = xdp->data; | |
4174 | xdp->data_end = xdp->data + hlen; | |
4175 | xdp->data_hard_start = skb->data - skb_headroom(skb); | |
4176 | orig_data_end = xdp->data_end; | |
4177 | orig_data = xdp->data; | |
d4455169 | 4178 | |
e817f856 | 4179 | rxqueue = netif_get_rxqueue(skb); |
02671e23 | 4180 | xdp->rxq = &rxqueue->xdp_rxq; |
e817f856 | 4181 | |
02671e23 | 4182 | act = bpf_prog_run_xdp(xdp_prog, xdp); |
d4455169 | 4183 | |
02671e23 | 4184 | off = xdp->data - orig_data; |
d4455169 JF |
4185 | if (off > 0) |
4186 | __skb_pull(skb, off); | |
4187 | else if (off < 0) | |
4188 | __skb_push(skb, -off); | |
92dd5452 | 4189 | skb->mac_header += off; |
d4455169 | 4190 | |
198d83bb NS |
4191 | /* check if bpf_xdp_adjust_tail was used. it can only "shrink" |
4192 | * pckt. | |
4193 | */ | |
02671e23 | 4194 | off = orig_data_end - xdp->data_end; |
f7613120 | 4195 | if (off != 0) { |
02671e23 | 4196 | skb_set_tail_pointer(skb, xdp->data_end - xdp->data); |
f7613120 | 4197 | skb->len -= off; |
02671e23 | 4198 | |
f7613120 | 4199 | } |
198d83bb | 4200 | |
d4455169 | 4201 | switch (act) { |
6103aa96 | 4202 | case XDP_REDIRECT: |
d4455169 JF |
4203 | case XDP_TX: |
4204 | __skb_push(skb, mac_len); | |
de8f3a83 | 4205 | break; |
d4455169 | 4206 | case XDP_PASS: |
02671e23 | 4207 | metalen = xdp->data - xdp->data_meta; |
de8f3a83 DB |
4208 | if (metalen) |
4209 | skb_metadata_set(skb, metalen); | |
d4455169 | 4210 | break; |
d4455169 JF |
4211 | default: |
4212 | bpf_warn_invalid_xdp_action(act); | |
4213 | /* fall through */ | |
4214 | case XDP_ABORTED: | |
4215 | trace_xdp_exception(skb->dev, xdp_prog, act); | |
4216 | /* fall through */ | |
4217 | case XDP_DROP: | |
4218 | do_drop: | |
4219 | kfree_skb(skb); | |
4220 | break; | |
4221 | } | |
4222 | ||
4223 | return act; | |
4224 | } | |
4225 | ||
4226 | /* When doing generic XDP we have to bypass the qdisc layer and the | |
4227 | * network taps in order to match in-driver-XDP behavior. | |
4228 | */ | |
7c497478 | 4229 | void generic_xdp_tx(struct sk_buff *skb, struct bpf_prog *xdp_prog) |
d4455169 JF |
4230 | { |
4231 | struct net_device *dev = skb->dev; | |
4232 | struct netdev_queue *txq; | |
4233 | bool free_skb = true; | |
4234 | int cpu, rc; | |
4235 | ||
4236 | txq = netdev_pick_tx(dev, skb, NULL); | |
4237 | cpu = smp_processor_id(); | |
4238 | HARD_TX_LOCK(dev, txq, cpu); | |
4239 | if (!netif_xmit_stopped(txq)) { | |
4240 | rc = netdev_start_xmit(skb, dev, txq, 0); | |
4241 | if (dev_xmit_complete(rc)) | |
4242 | free_skb = false; | |
4243 | } | |
4244 | HARD_TX_UNLOCK(dev, txq); | |
4245 | if (free_skb) { | |
4246 | trace_xdp_exception(dev, xdp_prog, XDP_TX); | |
4247 | kfree_skb(skb); | |
4248 | } | |
4249 | } | |
7c497478 | 4250 | EXPORT_SYMBOL_GPL(generic_xdp_tx); |
d4455169 | 4251 | |
02786475 | 4252 | static DEFINE_STATIC_KEY_FALSE(generic_xdp_needed_key); |
d4455169 | 4253 | |
7c497478 | 4254 | int do_xdp_generic(struct bpf_prog *xdp_prog, struct sk_buff *skb) |
d4455169 | 4255 | { |
d4455169 | 4256 | if (xdp_prog) { |
02671e23 BT |
4257 | struct xdp_buff xdp; |
4258 | u32 act; | |
6103aa96 | 4259 | int err; |
d4455169 | 4260 | |
02671e23 | 4261 | act = netif_receive_generic_xdp(skb, &xdp, xdp_prog); |
d4455169 | 4262 | if (act != XDP_PASS) { |
6103aa96 JF |
4263 | switch (act) { |
4264 | case XDP_REDIRECT: | |
2facaad6 | 4265 | err = xdp_do_generic_redirect(skb->dev, skb, |
02671e23 | 4266 | &xdp, xdp_prog); |
6103aa96 JF |
4267 | if (err) |
4268 | goto out_redir; | |
02671e23 | 4269 | break; |
6103aa96 | 4270 | case XDP_TX: |
d4455169 | 4271 | generic_xdp_tx(skb, xdp_prog); |
6103aa96 JF |
4272 | break; |
4273 | } | |
d4455169 JF |
4274 | return XDP_DROP; |
4275 | } | |
4276 | } | |
4277 | return XDP_PASS; | |
6103aa96 | 4278 | out_redir: |
6103aa96 JF |
4279 | kfree_skb(skb); |
4280 | return XDP_DROP; | |
d4455169 | 4281 | } |
7c497478 | 4282 | EXPORT_SYMBOL_GPL(do_xdp_generic); |
d4455169 | 4283 | |
ae78dbfa | 4284 | static int netif_rx_internal(struct sk_buff *skb) |
1da177e4 | 4285 | { |
b0e28f1e | 4286 | int ret; |
1da177e4 | 4287 | |
588f0330 | 4288 | net_timestamp_check(netdev_tstamp_prequeue, skb); |
1da177e4 | 4289 | |
cf66ba58 | 4290 | trace_netif_rx(skb); |
d4455169 | 4291 | |
02786475 | 4292 | if (static_branch_unlikely(&generic_xdp_needed_key)) { |
bbbe211c JF |
4293 | int ret; |
4294 | ||
4295 | preempt_disable(); | |
4296 | rcu_read_lock(); | |
4297 | ret = do_xdp_generic(rcu_dereference(skb->dev->xdp_prog), skb); | |
4298 | rcu_read_unlock(); | |
4299 | preempt_enable(); | |
d4455169 | 4300 | |
6103aa96 JF |
4301 | /* Consider XDP consuming the packet a success from |
4302 | * the netdev point of view we do not want to count | |
4303 | * this as an error. | |
4304 | */ | |
d4455169 | 4305 | if (ret != XDP_PASS) |
6103aa96 | 4306 | return NET_RX_SUCCESS; |
d4455169 JF |
4307 | } |
4308 | ||
df334545 | 4309 | #ifdef CONFIG_RPS |
c5905afb | 4310 | if (static_key_false(&rps_needed)) { |
fec5e652 | 4311 | struct rps_dev_flow voidflow, *rflow = &voidflow; |
b0e28f1e ED |
4312 | int cpu; |
4313 | ||
cece1945 | 4314 | preempt_disable(); |
b0e28f1e | 4315 | rcu_read_lock(); |
fec5e652 TH |
4316 | |
4317 | cpu = get_rps_cpu(skb->dev, skb, &rflow); | |
b0e28f1e ED |
4318 | if (cpu < 0) |
4319 | cpu = smp_processor_id(); | |
fec5e652 TH |
4320 | |
4321 | ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail); | |
4322 | ||
b0e28f1e | 4323 | rcu_read_unlock(); |
cece1945 | 4324 | preempt_enable(); |
adc9300e ED |
4325 | } else |
4326 | #endif | |
fec5e652 TH |
4327 | { |
4328 | unsigned int qtail; | |
f4563a75 | 4329 | |
fec5e652 TH |
4330 | ret = enqueue_to_backlog(skb, get_cpu(), &qtail); |
4331 | put_cpu(); | |
4332 | } | |
b0e28f1e | 4333 | return ret; |
1da177e4 | 4334 | } |
ae78dbfa BH |
4335 | |
4336 | /** | |
4337 | * netif_rx - post buffer to the network code | |
4338 | * @skb: buffer to post | |
4339 | * | |
4340 | * This function receives a packet from a device driver and queues it for | |
4341 | * the upper (protocol) levels to process. It always succeeds. The buffer | |
4342 | * may be dropped during processing for congestion control or by the | |
4343 | * protocol layers. | |
4344 | * | |
4345 | * return values: | |
4346 | * NET_RX_SUCCESS (no congestion) | |
4347 | * NET_RX_DROP (packet was dropped) | |
4348 | * | |
4349 | */ | |
4350 | ||
4351 | int netif_rx(struct sk_buff *skb) | |
4352 | { | |
4353 | trace_netif_rx_entry(skb); | |
4354 | ||
4355 | return netif_rx_internal(skb); | |
4356 | } | |
d1b19dff | 4357 | EXPORT_SYMBOL(netif_rx); |
1da177e4 LT |
4358 | |
4359 | int netif_rx_ni(struct sk_buff *skb) | |
4360 | { | |
4361 | int err; | |
4362 | ||
ae78dbfa BH |
4363 | trace_netif_rx_ni_entry(skb); |
4364 | ||
1da177e4 | 4365 | preempt_disable(); |
ae78dbfa | 4366 | err = netif_rx_internal(skb); |
1da177e4 LT |
4367 | if (local_softirq_pending()) |
4368 | do_softirq(); | |
4369 | preempt_enable(); | |
4370 | ||
4371 | return err; | |
4372 | } | |
1da177e4 LT |
4373 | EXPORT_SYMBOL(netif_rx_ni); |
4374 | ||
0766f788 | 4375 | static __latent_entropy void net_tx_action(struct softirq_action *h) |
1da177e4 | 4376 | { |
903ceff7 | 4377 | struct softnet_data *sd = this_cpu_ptr(&softnet_data); |
1da177e4 LT |
4378 | |
4379 | if (sd->completion_queue) { | |
4380 | struct sk_buff *clist; | |
4381 | ||
4382 | local_irq_disable(); | |
4383 | clist = sd->completion_queue; | |
4384 | sd->completion_queue = NULL; | |
4385 | local_irq_enable(); | |
4386 | ||
4387 | while (clist) { | |
4388 | struct sk_buff *skb = clist; | |
f4563a75 | 4389 | |
1da177e4 LT |
4390 | clist = clist->next; |
4391 | ||
63354797 | 4392 | WARN_ON(refcount_read(&skb->users)); |
e6247027 ED |
4393 | if (likely(get_kfree_skb_cb(skb)->reason == SKB_REASON_CONSUMED)) |
4394 | trace_consume_skb(skb); | |
4395 | else | |
4396 | trace_kfree_skb(skb, net_tx_action); | |
15fad714 JDB |
4397 | |
4398 | if (skb->fclone != SKB_FCLONE_UNAVAILABLE) | |
4399 | __kfree_skb(skb); | |
4400 | else | |
4401 | __kfree_skb_defer(skb); | |
1da177e4 | 4402 | } |
15fad714 JDB |
4403 | |
4404 | __kfree_skb_flush(); | |
1da177e4 LT |
4405 | } |
4406 | ||
4407 | if (sd->output_queue) { | |
37437bb2 | 4408 | struct Qdisc *head; |
1da177e4 LT |
4409 | |
4410 | local_irq_disable(); | |
4411 | head = sd->output_queue; | |
4412 | sd->output_queue = NULL; | |
a9cbd588 | 4413 | sd->output_queue_tailp = &sd->output_queue; |
1da177e4 LT |
4414 | local_irq_enable(); |
4415 | ||
4416 | while (head) { | |
37437bb2 | 4417 | struct Qdisc *q = head; |
6b3ba914 | 4418 | spinlock_t *root_lock = NULL; |
37437bb2 | 4419 | |
1da177e4 LT |
4420 | head = head->next_sched; |
4421 | ||
6b3ba914 JF |
4422 | if (!(q->flags & TCQ_F_NOLOCK)) { |
4423 | root_lock = qdisc_lock(q); | |
4424 | spin_lock(root_lock); | |
4425 | } | |
3bcb846c ED |
4426 | /* We need to make sure head->next_sched is read |
4427 | * before clearing __QDISC_STATE_SCHED | |
4428 | */ | |
4429 | smp_mb__before_atomic(); | |
4430 | clear_bit(__QDISC_STATE_SCHED, &q->state); | |
4431 | qdisc_run(q); | |
6b3ba914 JF |
4432 | if (root_lock) |
4433 | spin_unlock(root_lock); | |
1da177e4 LT |
4434 | } |
4435 | } | |
f53c7239 SK |
4436 | |
4437 | xfrm_dev_backlog(sd); | |
1da177e4 LT |
4438 | } |
4439 | ||
181402a5 | 4440 | #if IS_ENABLED(CONFIG_BRIDGE) && IS_ENABLED(CONFIG_ATM_LANE) |
da678292 MM |
4441 | /* This hook is defined here for ATM LANE */ |
4442 | int (*br_fdb_test_addr_hook)(struct net_device *dev, | |
4443 | unsigned char *addr) __read_mostly; | |
4fb019a0 | 4444 | EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook); |
da678292 | 4445 | #endif |
1da177e4 | 4446 | |
1f211a1b DB |
4447 | static inline struct sk_buff * |
4448 | sch_handle_ingress(struct sk_buff *skb, struct packet_type **pt_prev, int *ret, | |
4449 | struct net_device *orig_dev) | |
f697c3e8 | 4450 | { |
e7582bab | 4451 | #ifdef CONFIG_NET_CLS_ACT |
46209401 | 4452 | struct mini_Qdisc *miniq = rcu_dereference_bh(skb->dev->miniq_ingress); |
d2788d34 | 4453 | struct tcf_result cl_res; |
24824a09 | 4454 | |
c9e99fd0 DB |
4455 | /* If there's at least one ingress present somewhere (so |
4456 | * we get here via enabled static key), remaining devices | |
4457 | * that are not configured with an ingress qdisc will bail | |
d2788d34 | 4458 | * out here. |
c9e99fd0 | 4459 | */ |
46209401 | 4460 | if (!miniq) |
4577139b | 4461 | return skb; |
46209401 | 4462 | |
f697c3e8 HX |
4463 | if (*pt_prev) { |
4464 | *ret = deliver_skb(skb, *pt_prev, orig_dev); | |
4465 | *pt_prev = NULL; | |
1da177e4 LT |
4466 | } |
4467 | ||
3365495c | 4468 | qdisc_skb_cb(skb)->pkt_len = skb->len; |
8dc07fdb | 4469 | skb->tc_at_ingress = 1; |
46209401 | 4470 | mini_qdisc_bstats_cpu_update(miniq, skb); |
c9e99fd0 | 4471 | |
46209401 | 4472 | switch (tcf_classify(skb, miniq->filter_list, &cl_res, false)) { |
d2788d34 DB |
4473 | case TC_ACT_OK: |
4474 | case TC_ACT_RECLASSIFY: | |
4475 | skb->tc_index = TC_H_MIN(cl_res.classid); | |
4476 | break; | |
4477 | case TC_ACT_SHOT: | |
46209401 | 4478 | mini_qdisc_qstats_cpu_drop(miniq); |
8a3a4c6e ED |
4479 | kfree_skb(skb); |
4480 | return NULL; | |
d2788d34 DB |
4481 | case TC_ACT_STOLEN: |
4482 | case TC_ACT_QUEUED: | |
e25ea21f | 4483 | case TC_ACT_TRAP: |
8a3a4c6e | 4484 | consume_skb(skb); |
d2788d34 | 4485 | return NULL; |
27b29f63 AS |
4486 | case TC_ACT_REDIRECT: |
4487 | /* skb_mac_header check was done by cls/act_bpf, so | |
4488 | * we can safely push the L2 header back before | |
4489 | * redirecting to another netdev | |
4490 | */ | |
4491 | __skb_push(skb, skb->mac_len); | |
4492 | skb_do_redirect(skb); | |
4493 | return NULL; | |
d2788d34 DB |
4494 | default: |
4495 | break; | |
f697c3e8 | 4496 | } |
e7582bab | 4497 | #endif /* CONFIG_NET_CLS_ACT */ |
e687ad60 PN |
4498 | return skb; |
4499 | } | |
1da177e4 | 4500 | |
24b27fc4 MB |
4501 | /** |
4502 | * netdev_is_rx_handler_busy - check if receive handler is registered | |
4503 | * @dev: device to check | |
4504 | * | |
4505 | * Check if a receive handler is already registered for a given device. | |
4506 | * Return true if there one. | |
4507 | * | |
4508 | * The caller must hold the rtnl_mutex. | |
4509 | */ | |
4510 | bool netdev_is_rx_handler_busy(struct net_device *dev) | |
4511 | { | |
4512 | ASSERT_RTNL(); | |
4513 | return dev && rtnl_dereference(dev->rx_handler); | |
4514 | } | |
4515 | EXPORT_SYMBOL_GPL(netdev_is_rx_handler_busy); | |
4516 | ||
ab95bfe0 JP |
4517 | /** |
4518 | * netdev_rx_handler_register - register receive handler | |
4519 | * @dev: device to register a handler for | |
4520 | * @rx_handler: receive handler to register | |
93e2c32b | 4521 | * @rx_handler_data: data pointer that is used by rx handler |
ab95bfe0 | 4522 | * |
e227867f | 4523 | * Register a receive handler for a device. This handler will then be |
ab95bfe0 JP |
4524 | * called from __netif_receive_skb. A negative errno code is returned |
4525 | * on a failure. | |
4526 | * | |
4527 | * The caller must hold the rtnl_mutex. | |
8a4eb573 JP |
4528 | * |
4529 | * For a general description of rx_handler, see enum rx_handler_result. | |
ab95bfe0 JP |
4530 | */ |
4531 | int netdev_rx_handler_register(struct net_device *dev, | |
93e2c32b JP |
4532 | rx_handler_func_t *rx_handler, |
4533 | void *rx_handler_data) | |
ab95bfe0 | 4534 | { |
1b7cd004 | 4535 | if (netdev_is_rx_handler_busy(dev)) |
ab95bfe0 JP |
4536 | return -EBUSY; |
4537 | ||
f5426250 PA |
4538 | if (dev->priv_flags & IFF_NO_RX_HANDLER) |
4539 | return -EINVAL; | |
4540 | ||
00cfec37 | 4541 | /* Note: rx_handler_data must be set before rx_handler */ |
93e2c32b | 4542 | rcu_assign_pointer(dev->rx_handler_data, rx_handler_data); |
ab95bfe0 JP |
4543 | rcu_assign_pointer(dev->rx_handler, rx_handler); |
4544 | ||
4545 | return 0; | |
4546 | } | |
4547 | EXPORT_SYMBOL_GPL(netdev_rx_handler_register); | |
4548 | ||
4549 | /** | |
4550 | * netdev_rx_handler_unregister - unregister receive handler | |
4551 | * @dev: device to unregister a handler from | |
4552 | * | |
166ec369 | 4553 | * Unregister a receive handler from a device. |
ab95bfe0 JP |
4554 | * |
4555 | * The caller must hold the rtnl_mutex. | |
4556 | */ | |
4557 | void netdev_rx_handler_unregister(struct net_device *dev) | |
4558 | { | |
4559 | ||
4560 | ASSERT_RTNL(); | |
a9b3cd7f | 4561 | RCU_INIT_POINTER(dev->rx_handler, NULL); |
00cfec37 ED |
4562 | /* a reader seeing a non NULL rx_handler in a rcu_read_lock() |
4563 | * section has a guarantee to see a non NULL rx_handler_data | |
4564 | * as well. | |
4565 | */ | |
4566 | synchronize_net(); | |
a9b3cd7f | 4567 | RCU_INIT_POINTER(dev->rx_handler_data, NULL); |
ab95bfe0 JP |
4568 | } |
4569 | EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister); | |
4570 | ||
b4b9e355 MG |
4571 | /* |
4572 | * Limit the use of PFMEMALLOC reserves to those protocols that implement | |
4573 | * the special handling of PFMEMALLOC skbs. | |
4574 | */ | |
4575 | static bool skb_pfmemalloc_protocol(struct sk_buff *skb) | |
4576 | { | |
4577 | switch (skb->protocol) { | |
2b8837ae JP |
4578 | case htons(ETH_P_ARP): |
4579 | case htons(ETH_P_IP): | |
4580 | case htons(ETH_P_IPV6): | |
4581 | case htons(ETH_P_8021Q): | |
4582 | case htons(ETH_P_8021AD): | |
b4b9e355 MG |
4583 | return true; |
4584 | default: | |
4585 | return false; | |
4586 | } | |
4587 | } | |
4588 | ||
e687ad60 PN |
4589 | static inline int nf_ingress(struct sk_buff *skb, struct packet_type **pt_prev, |
4590 | int *ret, struct net_device *orig_dev) | |
4591 | { | |
e7582bab | 4592 | #ifdef CONFIG_NETFILTER_INGRESS |
e687ad60 | 4593 | if (nf_hook_ingress_active(skb)) { |
2c1e2703 AC |
4594 | int ingress_retval; |
4595 | ||
e687ad60 PN |
4596 | if (*pt_prev) { |
4597 | *ret = deliver_skb(skb, *pt_prev, orig_dev); | |
4598 | *pt_prev = NULL; | |
4599 | } | |
4600 | ||
2c1e2703 AC |
4601 | rcu_read_lock(); |
4602 | ingress_retval = nf_hook_ingress(skb); | |
4603 | rcu_read_unlock(); | |
4604 | return ingress_retval; | |
e687ad60 | 4605 | } |
e7582bab | 4606 | #endif /* CONFIG_NETFILTER_INGRESS */ |
e687ad60 PN |
4607 | return 0; |
4608 | } | |
e687ad60 | 4609 | |
88eb1944 EC |
4610 | static int __netif_receive_skb_core(struct sk_buff *skb, bool pfmemalloc, |
4611 | struct packet_type **ppt_prev) | |
1da177e4 LT |
4612 | { |
4613 | struct packet_type *ptype, *pt_prev; | |
ab95bfe0 | 4614 | rx_handler_func_t *rx_handler; |
f2ccd8fa | 4615 | struct net_device *orig_dev; |
8a4eb573 | 4616 | bool deliver_exact = false; |
1da177e4 | 4617 | int ret = NET_RX_DROP; |
252e3346 | 4618 | __be16 type; |
1da177e4 | 4619 | |
588f0330 | 4620 | net_timestamp_check(!netdev_tstamp_prequeue, skb); |
81bbb3d4 | 4621 | |
cf66ba58 | 4622 | trace_netif_receive_skb(skb); |
9b22ea56 | 4623 | |
cc9bd5ce | 4624 | orig_dev = skb->dev; |
8f903c70 | 4625 | |
c1d2bbe1 | 4626 | skb_reset_network_header(skb); |
fda55eca ED |
4627 | if (!skb_transport_header_was_set(skb)) |
4628 | skb_reset_transport_header(skb); | |
0b5c9db1 | 4629 | skb_reset_mac_len(skb); |
1da177e4 LT |
4630 | |
4631 | pt_prev = NULL; | |
4632 | ||
63d8ea7f | 4633 | another_round: |
b6858177 | 4634 | skb->skb_iif = skb->dev->ifindex; |
63d8ea7f DM |
4635 | |
4636 | __this_cpu_inc(softnet_data.processed); | |
4637 | ||
8ad227ff PM |
4638 | if (skb->protocol == cpu_to_be16(ETH_P_8021Q) || |
4639 | skb->protocol == cpu_to_be16(ETH_P_8021AD)) { | |
0d5501c1 | 4640 | skb = skb_vlan_untag(skb); |
bcc6d479 | 4641 | if (unlikely(!skb)) |
2c17d27c | 4642 | goto out; |
bcc6d479 JP |
4643 | } |
4644 | ||
e7246e12 WB |
4645 | if (skb_skip_tc_classify(skb)) |
4646 | goto skip_classify; | |
1da177e4 | 4647 | |
9754e293 | 4648 | if (pfmemalloc) |
b4b9e355 MG |
4649 | goto skip_taps; |
4650 | ||
1da177e4 | 4651 | list_for_each_entry_rcu(ptype, &ptype_all, list) { |
7866a621 SN |
4652 | if (pt_prev) |
4653 | ret = deliver_skb(skb, pt_prev, orig_dev); | |
4654 | pt_prev = ptype; | |
4655 | } | |
4656 | ||
4657 | list_for_each_entry_rcu(ptype, &skb->dev->ptype_all, list) { | |
4658 | if (pt_prev) | |
4659 | ret = deliver_skb(skb, pt_prev, orig_dev); | |
4660 | pt_prev = ptype; | |
1da177e4 LT |
4661 | } |
4662 | ||
b4b9e355 | 4663 | skip_taps: |
1cf51900 | 4664 | #ifdef CONFIG_NET_INGRESS |
aabf6772 | 4665 | if (static_branch_unlikely(&ingress_needed_key)) { |
1f211a1b | 4666 | skb = sch_handle_ingress(skb, &pt_prev, &ret, orig_dev); |
4577139b | 4667 | if (!skb) |
2c17d27c | 4668 | goto out; |
e687ad60 PN |
4669 | |
4670 | if (nf_ingress(skb, &pt_prev, &ret, orig_dev) < 0) | |
2c17d27c | 4671 | goto out; |
4577139b | 4672 | } |
1cf51900 | 4673 | #endif |
a5135bcf | 4674 | skb_reset_tc(skb); |
e7246e12 | 4675 | skip_classify: |
9754e293 | 4676 | if (pfmemalloc && !skb_pfmemalloc_protocol(skb)) |
b4b9e355 MG |
4677 | goto drop; |
4678 | ||
df8a39de | 4679 | if (skb_vlan_tag_present(skb)) { |
2425717b JF |
4680 | if (pt_prev) { |
4681 | ret = deliver_skb(skb, pt_prev, orig_dev); | |
4682 | pt_prev = NULL; | |
4683 | } | |
48cc32d3 | 4684 | if (vlan_do_receive(&skb)) |
2425717b JF |
4685 | goto another_round; |
4686 | else if (unlikely(!skb)) | |
2c17d27c | 4687 | goto out; |
2425717b JF |
4688 | } |
4689 | ||
48cc32d3 | 4690 | rx_handler = rcu_dereference(skb->dev->rx_handler); |
ab95bfe0 JP |
4691 | if (rx_handler) { |
4692 | if (pt_prev) { | |
4693 | ret = deliver_skb(skb, pt_prev, orig_dev); | |
4694 | pt_prev = NULL; | |
4695 | } | |
8a4eb573 JP |
4696 | switch (rx_handler(&skb)) { |
4697 | case RX_HANDLER_CONSUMED: | |
3bc1b1ad | 4698 | ret = NET_RX_SUCCESS; |
2c17d27c | 4699 | goto out; |
8a4eb573 | 4700 | case RX_HANDLER_ANOTHER: |
63d8ea7f | 4701 | goto another_round; |
8a4eb573 JP |
4702 | case RX_HANDLER_EXACT: |
4703 | deliver_exact = true; | |
4704 | case RX_HANDLER_PASS: | |
4705 | break; | |
4706 | default: | |
4707 | BUG(); | |
4708 | } | |
ab95bfe0 | 4709 | } |
1da177e4 | 4710 | |
df8a39de JP |
4711 | if (unlikely(skb_vlan_tag_present(skb))) { |
4712 | if (skb_vlan_tag_get_id(skb)) | |
d4b812de ED |
4713 | skb->pkt_type = PACKET_OTHERHOST; |
4714 | /* Note: we might in the future use prio bits | |
4715 | * and set skb->priority like in vlan_do_receive() | |
4716 | * For the time being, just ignore Priority Code Point | |
4717 | */ | |
4718 | skb->vlan_tci = 0; | |
4719 | } | |
48cc32d3 | 4720 | |
7866a621 SN |
4721 | type = skb->protocol; |
4722 | ||
63d8ea7f | 4723 | /* deliver only exact match when indicated */ |
7866a621 SN |
4724 | if (likely(!deliver_exact)) { |
4725 | deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type, | |
4726 | &ptype_base[ntohs(type) & | |
4727 | PTYPE_HASH_MASK]); | |
4728 | } | |
1f3c8804 | 4729 | |
7866a621 SN |
4730 | deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type, |
4731 | &orig_dev->ptype_specific); | |
4732 | ||
4733 | if (unlikely(skb->dev != orig_dev)) { | |
4734 | deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type, | |
4735 | &skb->dev->ptype_specific); | |
1da177e4 LT |
4736 | } |
4737 | ||
4738 | if (pt_prev) { | |
1f8b977a | 4739 | if (unlikely(skb_orphan_frags_rx(skb, GFP_ATOMIC))) |
0e698bf6 | 4740 | goto drop; |
88eb1944 | 4741 | *ppt_prev = pt_prev; |
1da177e4 | 4742 | } else { |
b4b9e355 | 4743 | drop: |
6e7333d3 JW |
4744 | if (!deliver_exact) |
4745 | atomic_long_inc(&skb->dev->rx_dropped); | |
4746 | else | |
4747 | atomic_long_inc(&skb->dev->rx_nohandler); | |
1da177e4 LT |
4748 | kfree_skb(skb); |
4749 | /* Jamal, now you will not able to escape explaining | |
4750 | * me how you were going to use this. :-) | |
4751 | */ | |
4752 | ret = NET_RX_DROP; | |
4753 | } | |
4754 | ||
2c17d27c | 4755 | out: |
9754e293 DM |
4756 | return ret; |
4757 | } | |
4758 | ||
88eb1944 EC |
4759 | static int __netif_receive_skb_one_core(struct sk_buff *skb, bool pfmemalloc) |
4760 | { | |
4761 | struct net_device *orig_dev = skb->dev; | |
4762 | struct packet_type *pt_prev = NULL; | |
4763 | int ret; | |
4764 | ||
4765 | ret = __netif_receive_skb_core(skb, pfmemalloc, &pt_prev); | |
4766 | if (pt_prev) | |
4767 | ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev); | |
4768 | return ret; | |
4769 | } | |
4770 | ||
1c601d82 JDB |
4771 | /** |
4772 | * netif_receive_skb_core - special purpose version of netif_receive_skb | |
4773 | * @skb: buffer to process | |
4774 | * | |
4775 | * More direct receive version of netif_receive_skb(). It should | |
4776 | * only be used by callers that have a need to skip RPS and Generic XDP. | |
4777 | * Caller must also take care of handling if (page_is_)pfmemalloc. | |
4778 | * | |
4779 | * This function may only be called from softirq context and interrupts | |
4780 | * should be enabled. | |
4781 | * | |
4782 | * Return values (usually ignored): | |
4783 | * NET_RX_SUCCESS: no congestion | |
4784 | * NET_RX_DROP: packet was dropped | |
4785 | */ | |
4786 | int netif_receive_skb_core(struct sk_buff *skb) | |
4787 | { | |
4788 | int ret; | |
4789 | ||
4790 | rcu_read_lock(); | |
88eb1944 | 4791 | ret = __netif_receive_skb_one_core(skb, false); |
1c601d82 JDB |
4792 | rcu_read_unlock(); |
4793 | ||
4794 | return ret; | |
4795 | } | |
4796 | EXPORT_SYMBOL(netif_receive_skb_core); | |
4797 | ||
88eb1944 EC |
4798 | static inline void __netif_receive_skb_list_ptype(struct list_head *head, |
4799 | struct packet_type *pt_prev, | |
4800 | struct net_device *orig_dev) | |
4ce0017a EC |
4801 | { |
4802 | struct sk_buff *skb, *next; | |
4803 | ||
88eb1944 EC |
4804 | if (!pt_prev) |
4805 | return; | |
4806 | if (list_empty(head)) | |
4807 | return; | |
17266ee9 EC |
4808 | if (pt_prev->list_func != NULL) |
4809 | pt_prev->list_func(head, pt_prev, orig_dev); | |
4810 | else | |
4811 | list_for_each_entry_safe(skb, next, head, list) | |
4812 | pt_prev->func(skb, skb->dev, pt_prev, orig_dev); | |
88eb1944 EC |
4813 | } |
4814 | ||
4815 | static void __netif_receive_skb_list_core(struct list_head *head, bool pfmemalloc) | |
4816 | { | |
4817 | /* Fast-path assumptions: | |
4818 | * - There is no RX handler. | |
4819 | * - Only one packet_type matches. | |
4820 | * If either of these fails, we will end up doing some per-packet | |
4821 | * processing in-line, then handling the 'last ptype' for the whole | |
4822 | * sublist. This can't cause out-of-order delivery to any single ptype, | |
4823 | * because the 'last ptype' must be constant across the sublist, and all | |
4824 | * other ptypes are handled per-packet. | |
4825 | */ | |
4826 | /* Current (common) ptype of sublist */ | |
4827 | struct packet_type *pt_curr = NULL; | |
4828 | /* Current (common) orig_dev of sublist */ | |
4829 | struct net_device *od_curr = NULL; | |
4830 | struct list_head sublist; | |
4831 | struct sk_buff *skb, *next; | |
4832 | ||
4833 | list_for_each_entry_safe(skb, next, head, list) { | |
4834 | struct net_device *orig_dev = skb->dev; | |
4835 | struct packet_type *pt_prev = NULL; | |
4836 | ||
4837 | __netif_receive_skb_core(skb, pfmemalloc, &pt_prev); | |
4838 | if (pt_curr != pt_prev || od_curr != orig_dev) { | |
4839 | /* dispatch old sublist */ | |
4840 | list_cut_before(&sublist, head, &skb->list); | |
4841 | __netif_receive_skb_list_ptype(&sublist, pt_curr, od_curr); | |
4842 | /* start new sublist */ | |
4843 | pt_curr = pt_prev; | |
4844 | od_curr = orig_dev; | |
4845 | } | |
4846 | } | |
4847 | ||
4848 | /* dispatch final sublist */ | |
4849 | __netif_receive_skb_list_ptype(head, pt_curr, od_curr); | |
4ce0017a EC |
4850 | } |
4851 | ||
9754e293 DM |
4852 | static int __netif_receive_skb(struct sk_buff *skb) |
4853 | { | |
4854 | int ret; | |
4855 | ||
4856 | if (sk_memalloc_socks() && skb_pfmemalloc(skb)) { | |
f1083048 | 4857 | unsigned int noreclaim_flag; |
9754e293 DM |
4858 | |
4859 | /* | |
4860 | * PFMEMALLOC skbs are special, they should | |
4861 | * - be delivered to SOCK_MEMALLOC sockets only | |
4862 | * - stay away from userspace | |
4863 | * - have bounded memory usage | |
4864 | * | |
4865 | * Use PF_MEMALLOC as this saves us from propagating the allocation | |
4866 | * context down to all allocation sites. | |
4867 | */ | |
f1083048 | 4868 | noreclaim_flag = memalloc_noreclaim_save(); |
88eb1944 | 4869 | ret = __netif_receive_skb_one_core(skb, true); |
f1083048 | 4870 | memalloc_noreclaim_restore(noreclaim_flag); |
9754e293 | 4871 | } else |
88eb1944 | 4872 | ret = __netif_receive_skb_one_core(skb, false); |
9754e293 | 4873 | |
1da177e4 LT |
4874 | return ret; |
4875 | } | |
0a9627f2 | 4876 | |
4ce0017a EC |
4877 | static void __netif_receive_skb_list(struct list_head *head) |
4878 | { | |
4879 | unsigned long noreclaim_flag = 0; | |
4880 | struct sk_buff *skb, *next; | |
4881 | bool pfmemalloc = false; /* Is current sublist PF_MEMALLOC? */ | |
4882 | ||
4883 | list_for_each_entry_safe(skb, next, head, list) { | |
4884 | if ((sk_memalloc_socks() && skb_pfmemalloc(skb)) != pfmemalloc) { | |
4885 | struct list_head sublist; | |
4886 | ||
4887 | /* Handle the previous sublist */ | |
4888 | list_cut_before(&sublist, head, &skb->list); | |
b9f463d6 EC |
4889 | if (!list_empty(&sublist)) |
4890 | __netif_receive_skb_list_core(&sublist, pfmemalloc); | |
4ce0017a EC |
4891 | pfmemalloc = !pfmemalloc; |
4892 | /* See comments in __netif_receive_skb */ | |
4893 | if (pfmemalloc) | |
4894 | noreclaim_flag = memalloc_noreclaim_save(); | |
4895 | else | |
4896 | memalloc_noreclaim_restore(noreclaim_flag); | |
4897 | } | |
4898 | } | |
4899 | /* Handle the remaining sublist */ | |
b9f463d6 EC |
4900 | if (!list_empty(head)) |
4901 | __netif_receive_skb_list_core(head, pfmemalloc); | |
4ce0017a EC |
4902 | /* Restore pflags */ |
4903 | if (pfmemalloc) | |
4904 | memalloc_noreclaim_restore(noreclaim_flag); | |
4905 | } | |
4906 | ||
f4e63525 | 4907 | static int generic_xdp_install(struct net_device *dev, struct netdev_bpf *xdp) |
b5cdae32 | 4908 | { |
58038695 | 4909 | struct bpf_prog *old = rtnl_dereference(dev->xdp_prog); |
b5cdae32 DM |
4910 | struct bpf_prog *new = xdp->prog; |
4911 | int ret = 0; | |
4912 | ||
4913 | switch (xdp->command) { | |
58038695 | 4914 | case XDP_SETUP_PROG: |
b5cdae32 DM |
4915 | rcu_assign_pointer(dev->xdp_prog, new); |
4916 | if (old) | |
4917 | bpf_prog_put(old); | |
4918 | ||
4919 | if (old && !new) { | |
02786475 | 4920 | static_branch_dec(&generic_xdp_needed_key); |
b5cdae32 | 4921 | } else if (new && !old) { |
02786475 | 4922 | static_branch_inc(&generic_xdp_needed_key); |
b5cdae32 | 4923 | dev_disable_lro(dev); |
56f5aa77 | 4924 | dev_disable_gro_hw(dev); |
b5cdae32 DM |
4925 | } |
4926 | break; | |
b5cdae32 DM |
4927 | |
4928 | case XDP_QUERY_PROG: | |
58038695 MKL |
4929 | xdp->prog_attached = !!old; |
4930 | xdp->prog_id = old ? old->aux->id : 0; | |
b5cdae32 DM |
4931 | break; |
4932 | ||
4933 | default: | |
4934 | ret = -EINVAL; | |
4935 | break; | |
4936 | } | |
4937 | ||
4938 | return ret; | |
4939 | } | |
4940 | ||
ae78dbfa | 4941 | static int netif_receive_skb_internal(struct sk_buff *skb) |
0a9627f2 | 4942 | { |
2c17d27c JA |
4943 | int ret; |
4944 | ||
588f0330 | 4945 | net_timestamp_check(netdev_tstamp_prequeue, skb); |
3b098e2d | 4946 | |
c1f19b51 RC |
4947 | if (skb_defer_rx_timestamp(skb)) |
4948 | return NET_RX_SUCCESS; | |
4949 | ||
02786475 | 4950 | if (static_branch_unlikely(&generic_xdp_needed_key)) { |
bbbe211c | 4951 | int ret; |
b5cdae32 | 4952 | |
bbbe211c JF |
4953 | preempt_disable(); |
4954 | rcu_read_lock(); | |
4955 | ret = do_xdp_generic(rcu_dereference(skb->dev->xdp_prog), skb); | |
4956 | rcu_read_unlock(); | |
4957 | preempt_enable(); | |
4958 | ||
4959 | if (ret != XDP_PASS) | |
d4455169 | 4960 | return NET_RX_DROP; |
b5cdae32 DM |
4961 | } |
4962 | ||
bbbe211c | 4963 | rcu_read_lock(); |
df334545 | 4964 | #ifdef CONFIG_RPS |
c5905afb | 4965 | if (static_key_false(&rps_needed)) { |
3b098e2d | 4966 | struct rps_dev_flow voidflow, *rflow = &voidflow; |
2c17d27c | 4967 | int cpu = get_rps_cpu(skb->dev, skb, &rflow); |
0a9627f2 | 4968 | |
3b098e2d ED |
4969 | if (cpu >= 0) { |
4970 | ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail); | |
4971 | rcu_read_unlock(); | |
adc9300e | 4972 | return ret; |
3b098e2d | 4973 | } |
fec5e652 | 4974 | } |
1e94d72f | 4975 | #endif |
2c17d27c JA |
4976 | ret = __netif_receive_skb(skb); |
4977 | rcu_read_unlock(); | |
4978 | return ret; | |
0a9627f2 | 4979 | } |
ae78dbfa | 4980 | |
7da517a3 EC |
4981 | static void netif_receive_skb_list_internal(struct list_head *head) |
4982 | { | |
4983 | struct bpf_prog *xdp_prog = NULL; | |
4984 | struct sk_buff *skb, *next; | |
4985 | ||
4986 | list_for_each_entry_safe(skb, next, head, list) { | |
4987 | net_timestamp_check(netdev_tstamp_prequeue, skb); | |
4988 | if (skb_defer_rx_timestamp(skb)) | |
4989 | /* Handled, remove from list */ | |
4990 | list_del(&skb->list); | |
4991 | } | |
4992 | ||
4993 | if (static_branch_unlikely(&generic_xdp_needed_key)) { | |
4994 | preempt_disable(); | |
4995 | rcu_read_lock(); | |
4996 | list_for_each_entry_safe(skb, next, head, list) { | |
4997 | xdp_prog = rcu_dereference(skb->dev->xdp_prog); | |
4998 | if (do_xdp_generic(xdp_prog, skb) != XDP_PASS) | |
4999 | /* Dropped, remove from list */ | |
5000 | list_del(&skb->list); | |
5001 | } | |
5002 | rcu_read_unlock(); | |
5003 | preempt_enable(); | |
5004 | } | |
5005 | ||
5006 | rcu_read_lock(); | |
5007 | #ifdef CONFIG_RPS | |
5008 | if (static_key_false(&rps_needed)) { | |
5009 | list_for_each_entry_safe(skb, next, head, list) { | |
5010 | struct rps_dev_flow voidflow, *rflow = &voidflow; | |
5011 | int cpu = get_rps_cpu(skb->dev, skb, &rflow); | |
5012 | ||
5013 | if (cpu >= 0) { | |
5014 | enqueue_to_backlog(skb, cpu, &rflow->last_qtail); | |
5015 | /* Handled, remove from list */ | |
5016 | list_del(&skb->list); | |
5017 | } | |
5018 | } | |
5019 | } | |
5020 | #endif | |
5021 | __netif_receive_skb_list(head); | |
5022 | rcu_read_unlock(); | |
5023 | } | |
5024 | ||
ae78dbfa BH |
5025 | /** |
5026 | * netif_receive_skb - process receive buffer from network | |
5027 | * @skb: buffer to process | |
5028 | * | |
5029 | * netif_receive_skb() is the main receive data processing function. | |
5030 | * It always succeeds. The buffer may be dropped during processing | |
5031 | * for congestion control or by the protocol layers. | |
5032 | * | |
5033 | * This function may only be called from softirq context and interrupts | |
5034 | * should be enabled. | |
5035 | * | |
5036 | * Return values (usually ignored): | |
5037 | * NET_RX_SUCCESS: no congestion | |
5038 | * NET_RX_DROP: packet was dropped | |
5039 | */ | |
04eb4489 | 5040 | int netif_receive_skb(struct sk_buff *skb) |
ae78dbfa BH |
5041 | { |
5042 | trace_netif_receive_skb_entry(skb); | |
5043 | ||
5044 | return netif_receive_skb_internal(skb); | |
5045 | } | |
04eb4489 | 5046 | EXPORT_SYMBOL(netif_receive_skb); |
1da177e4 | 5047 | |
f6ad8c1b EC |
5048 | /** |
5049 | * netif_receive_skb_list - process many receive buffers from network | |
5050 | * @head: list of skbs to process. | |
5051 | * | |
7da517a3 EC |
5052 | * Since return value of netif_receive_skb() is normally ignored, and |
5053 | * wouldn't be meaningful for a list, this function returns void. | |
f6ad8c1b EC |
5054 | * |
5055 | * This function may only be called from softirq context and interrupts | |
5056 | * should be enabled. | |
5057 | */ | |
5058 | void netif_receive_skb_list(struct list_head *head) | |
5059 | { | |
7da517a3 | 5060 | struct sk_buff *skb; |
f6ad8c1b | 5061 | |
b9f463d6 EC |
5062 | if (list_empty(head)) |
5063 | return; | |
920572b7 EC |
5064 | list_for_each_entry(skb, head, list) |
5065 | trace_netif_receive_skb_list_entry(skb); | |
7da517a3 | 5066 | netif_receive_skb_list_internal(head); |
f6ad8c1b EC |
5067 | } |
5068 | EXPORT_SYMBOL(netif_receive_skb_list); | |
5069 | ||
41852497 | 5070 | DEFINE_PER_CPU(struct work_struct, flush_works); |
145dd5f9 PA |
5071 | |
5072 | /* Network device is going away, flush any packets still pending */ | |
5073 | static void flush_backlog(struct work_struct *work) | |
6e583ce5 | 5074 | { |
6e583ce5 | 5075 | struct sk_buff *skb, *tmp; |
145dd5f9 PA |
5076 | struct softnet_data *sd; |
5077 | ||
5078 | local_bh_disable(); | |
5079 | sd = this_cpu_ptr(&softnet_data); | |
6e583ce5 | 5080 | |
145dd5f9 | 5081 | local_irq_disable(); |
e36fa2f7 | 5082 | rps_lock(sd); |
6e7676c1 | 5083 | skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) { |
41852497 | 5084 | if (skb->dev->reg_state == NETREG_UNREGISTERING) { |
e36fa2f7 | 5085 | __skb_unlink(skb, &sd->input_pkt_queue); |
6e583ce5 | 5086 | kfree_skb(skb); |
76cc8b13 | 5087 | input_queue_head_incr(sd); |
6e583ce5 | 5088 | } |
6e7676c1 | 5089 | } |
e36fa2f7 | 5090 | rps_unlock(sd); |
145dd5f9 | 5091 | local_irq_enable(); |
6e7676c1 CG |
5092 | |
5093 | skb_queue_walk_safe(&sd->process_queue, skb, tmp) { | |
41852497 | 5094 | if (skb->dev->reg_state == NETREG_UNREGISTERING) { |
6e7676c1 CG |
5095 | __skb_unlink(skb, &sd->process_queue); |
5096 | kfree_skb(skb); | |
76cc8b13 | 5097 | input_queue_head_incr(sd); |
6e7676c1 CG |
5098 | } |
5099 | } | |
145dd5f9 PA |
5100 | local_bh_enable(); |
5101 | } | |
5102 | ||
41852497 | 5103 | static void flush_all_backlogs(void) |
145dd5f9 PA |
5104 | { |
5105 | unsigned int cpu; | |
5106 | ||
5107 | get_online_cpus(); | |
5108 | ||
41852497 ED |
5109 | for_each_online_cpu(cpu) |
5110 | queue_work_on(cpu, system_highpri_wq, | |
5111 | per_cpu_ptr(&flush_works, cpu)); | |
145dd5f9 PA |
5112 | |
5113 | for_each_online_cpu(cpu) | |
41852497 | 5114 | flush_work(per_cpu_ptr(&flush_works, cpu)); |
145dd5f9 PA |
5115 | |
5116 | put_online_cpus(); | |
6e583ce5 SH |
5117 | } |
5118 | ||
d565b0a1 HX |
5119 | static int napi_gro_complete(struct sk_buff *skb) |
5120 | { | |
22061d80 | 5121 | struct packet_offload *ptype; |
d565b0a1 | 5122 | __be16 type = skb->protocol; |
22061d80 | 5123 | struct list_head *head = &offload_base; |
d565b0a1 HX |
5124 | int err = -ENOENT; |
5125 | ||
c3c7c254 ED |
5126 | BUILD_BUG_ON(sizeof(struct napi_gro_cb) > sizeof(skb->cb)); |
5127 | ||
fc59f9a3 HX |
5128 | if (NAPI_GRO_CB(skb)->count == 1) { |
5129 | skb_shinfo(skb)->gso_size = 0; | |
d565b0a1 | 5130 | goto out; |
fc59f9a3 | 5131 | } |
d565b0a1 HX |
5132 | |
5133 | rcu_read_lock(); | |
5134 | list_for_each_entry_rcu(ptype, head, list) { | |
f191a1d1 | 5135 | if (ptype->type != type || !ptype->callbacks.gro_complete) |
d565b0a1 HX |
5136 | continue; |
5137 | ||
299603e8 | 5138 | err = ptype->callbacks.gro_complete(skb, 0); |
d565b0a1 HX |
5139 | break; |
5140 | } | |
5141 | rcu_read_unlock(); | |
5142 | ||
5143 | if (err) { | |
5144 | WARN_ON(&ptype->list == head); | |
5145 | kfree_skb(skb); | |
5146 | return NET_RX_SUCCESS; | |
5147 | } | |
5148 | ||
5149 | out: | |
ae78dbfa | 5150 | return netif_receive_skb_internal(skb); |
d565b0a1 HX |
5151 | } |
5152 | ||
6312fe77 | 5153 | static void __napi_gro_flush_chain(struct napi_struct *napi, u32 index, |
07d78363 | 5154 | bool flush_old) |
d565b0a1 | 5155 | { |
6312fe77 | 5156 | struct list_head *head = &napi->gro_hash[index].list; |
d4546c25 | 5157 | struct sk_buff *skb, *p; |
2e71a6f8 | 5158 | |
07d78363 | 5159 | list_for_each_entry_safe_reverse(skb, p, head, list) { |
2e71a6f8 ED |
5160 | if (flush_old && NAPI_GRO_CB(skb)->age == jiffies) |
5161 | return; | |
d4546c25 | 5162 | list_del_init(&skb->list); |
d565b0a1 | 5163 | napi_gro_complete(skb); |
2e71a6f8 | 5164 | napi->gro_count--; |
6312fe77 | 5165 | napi->gro_hash[index].count--; |
d565b0a1 | 5166 | } |
d565b0a1 | 5167 | } |
07d78363 | 5168 | |
6312fe77 | 5169 | /* napi->gro_hash[].list contains packets ordered by age. |
07d78363 DM |
5170 | * youngest packets at the head of it. |
5171 | * Complete skbs in reverse order to reduce latencies. | |
5172 | */ | |
5173 | void napi_gro_flush(struct napi_struct *napi, bool flush_old) | |
5174 | { | |
6312fe77 | 5175 | u32 i; |
07d78363 | 5176 | |
6312fe77 LR |
5177 | for (i = 0; i < GRO_HASH_BUCKETS; i++) |
5178 | __napi_gro_flush_chain(napi, i, flush_old); | |
07d78363 | 5179 | } |
86cac58b | 5180 | EXPORT_SYMBOL(napi_gro_flush); |
d565b0a1 | 5181 | |
07d78363 DM |
5182 | static struct list_head *gro_list_prepare(struct napi_struct *napi, |
5183 | struct sk_buff *skb) | |
89c5fa33 | 5184 | { |
89c5fa33 | 5185 | unsigned int maclen = skb->dev->hard_header_len; |
0b4cec8c | 5186 | u32 hash = skb_get_hash_raw(skb); |
07d78363 | 5187 | struct list_head *head; |
d4546c25 | 5188 | struct sk_buff *p; |
89c5fa33 | 5189 | |
6312fe77 | 5190 | head = &napi->gro_hash[hash & (GRO_HASH_BUCKETS - 1)].list; |
07d78363 | 5191 | list_for_each_entry(p, head, list) { |
89c5fa33 ED |
5192 | unsigned long diffs; |
5193 | ||
0b4cec8c TH |
5194 | NAPI_GRO_CB(p)->flush = 0; |
5195 | ||
5196 | if (hash != skb_get_hash_raw(p)) { | |
5197 | NAPI_GRO_CB(p)->same_flow = 0; | |
5198 | continue; | |
5199 | } | |
5200 | ||
89c5fa33 ED |
5201 | diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev; |
5202 | diffs |= p->vlan_tci ^ skb->vlan_tci; | |
ce87fc6c | 5203 | diffs |= skb_metadata_dst_cmp(p, skb); |
de8f3a83 | 5204 | diffs |= skb_metadata_differs(p, skb); |
89c5fa33 ED |
5205 | if (maclen == ETH_HLEN) |
5206 | diffs |= compare_ether_header(skb_mac_header(p), | |
a50e233c | 5207 | skb_mac_header(skb)); |
89c5fa33 ED |
5208 | else if (!diffs) |
5209 | diffs = memcmp(skb_mac_header(p), | |
a50e233c | 5210 | skb_mac_header(skb), |
89c5fa33 ED |
5211 | maclen); |
5212 | NAPI_GRO_CB(p)->same_flow = !diffs; | |
89c5fa33 | 5213 | } |
07d78363 DM |
5214 | |
5215 | return head; | |
89c5fa33 ED |
5216 | } |
5217 | ||
299603e8 JC |
5218 | static void skb_gro_reset_offset(struct sk_buff *skb) |
5219 | { | |
5220 | const struct skb_shared_info *pinfo = skb_shinfo(skb); | |
5221 | const skb_frag_t *frag0 = &pinfo->frags[0]; | |
5222 | ||
5223 | NAPI_GRO_CB(skb)->data_offset = 0; | |
5224 | NAPI_GRO_CB(skb)->frag0 = NULL; | |
5225 | NAPI_GRO_CB(skb)->frag0_len = 0; | |
5226 | ||
5227 | if (skb_mac_header(skb) == skb_tail_pointer(skb) && | |
5228 | pinfo->nr_frags && | |
5229 | !PageHighMem(skb_frag_page(frag0))) { | |
5230 | NAPI_GRO_CB(skb)->frag0 = skb_frag_address(frag0); | |
7cfd5fd5 ED |
5231 | NAPI_GRO_CB(skb)->frag0_len = min_t(unsigned int, |
5232 | skb_frag_size(frag0), | |
5233 | skb->end - skb->tail); | |
89c5fa33 ED |
5234 | } |
5235 | } | |
5236 | ||
a50e233c ED |
5237 | static void gro_pull_from_frag0(struct sk_buff *skb, int grow) |
5238 | { | |
5239 | struct skb_shared_info *pinfo = skb_shinfo(skb); | |
5240 | ||
5241 | BUG_ON(skb->end - skb->tail < grow); | |
5242 | ||
5243 | memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow); | |
5244 | ||
5245 | skb->data_len -= grow; | |
5246 | skb->tail += grow; | |
5247 | ||
5248 | pinfo->frags[0].page_offset += grow; | |
5249 | skb_frag_size_sub(&pinfo->frags[0], grow); | |
5250 | ||
5251 | if (unlikely(!skb_frag_size(&pinfo->frags[0]))) { | |
5252 | skb_frag_unref(skb, 0); | |
5253 | memmove(pinfo->frags, pinfo->frags + 1, | |
5254 | --pinfo->nr_frags * sizeof(pinfo->frags[0])); | |
5255 | } | |
5256 | } | |
5257 | ||
6312fe77 | 5258 | static void gro_flush_oldest(struct list_head *head) |
07d78363 | 5259 | { |
6312fe77 | 5260 | struct sk_buff *oldest; |
07d78363 | 5261 | |
6312fe77 | 5262 | oldest = list_last_entry(head, struct sk_buff, list); |
07d78363 | 5263 | |
6312fe77 | 5264 | /* We are called with head length >= MAX_GRO_SKBS, so this is |
07d78363 DM |
5265 | * impossible. |
5266 | */ | |
5267 | if (WARN_ON_ONCE(!oldest)) | |
5268 | return; | |
5269 | ||
5270 | /* Do not adjust napi->gro_count, caller is adding a new SKB to | |
5271 | * the chain. | |
5272 | */ | |
5273 | list_del(&oldest->list); | |
5274 | napi_gro_complete(oldest); | |
5275 | } | |
5276 | ||
bb728820 | 5277 | static enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb) |
d565b0a1 | 5278 | { |
6312fe77 | 5279 | u32 hash = skb_get_hash_raw(skb) & (GRO_HASH_BUCKETS - 1); |
d4546c25 | 5280 | struct list_head *head = &offload_base; |
22061d80 | 5281 | struct packet_offload *ptype; |
d565b0a1 | 5282 | __be16 type = skb->protocol; |
07d78363 | 5283 | struct list_head *gro_head; |
d4546c25 | 5284 | struct sk_buff *pp = NULL; |
5b252f0c | 5285 | enum gro_result ret; |
d4546c25 | 5286 | int same_flow; |
a50e233c | 5287 | int grow; |
d565b0a1 | 5288 | |
b5cdae32 | 5289 | if (netif_elide_gro(skb->dev)) |
d565b0a1 HX |
5290 | goto normal; |
5291 | ||
07d78363 | 5292 | gro_head = gro_list_prepare(napi, skb); |
89c5fa33 | 5293 | |
d565b0a1 HX |
5294 | rcu_read_lock(); |
5295 | list_for_each_entry_rcu(ptype, head, list) { | |
f191a1d1 | 5296 | if (ptype->type != type || !ptype->callbacks.gro_receive) |
d565b0a1 HX |
5297 | continue; |
5298 | ||
86911732 | 5299 | skb_set_network_header(skb, skb_gro_offset(skb)); |
efd9450e | 5300 | skb_reset_mac_len(skb); |
d565b0a1 | 5301 | NAPI_GRO_CB(skb)->same_flow = 0; |
d61d072e | 5302 | NAPI_GRO_CB(skb)->flush = skb_is_gso(skb) || skb_has_frag_list(skb); |
5d38a079 | 5303 | NAPI_GRO_CB(skb)->free = 0; |
fac8e0f5 | 5304 | NAPI_GRO_CB(skb)->encap_mark = 0; |
fcd91dd4 | 5305 | NAPI_GRO_CB(skb)->recursion_counter = 0; |
a0ca153f | 5306 | NAPI_GRO_CB(skb)->is_fou = 0; |
1530545e | 5307 | NAPI_GRO_CB(skb)->is_atomic = 1; |
15e2396d | 5308 | NAPI_GRO_CB(skb)->gro_remcsum_start = 0; |
d565b0a1 | 5309 | |
662880f4 TH |
5310 | /* Setup for GRO checksum validation */ |
5311 | switch (skb->ip_summed) { | |
5312 | case CHECKSUM_COMPLETE: | |
5313 | NAPI_GRO_CB(skb)->csum = skb->csum; | |
5314 | NAPI_GRO_CB(skb)->csum_valid = 1; | |
5315 | NAPI_GRO_CB(skb)->csum_cnt = 0; | |
5316 | break; | |
5317 | case CHECKSUM_UNNECESSARY: | |
5318 | NAPI_GRO_CB(skb)->csum_cnt = skb->csum_level + 1; | |
5319 | NAPI_GRO_CB(skb)->csum_valid = 0; | |
5320 | break; | |
5321 | default: | |
5322 | NAPI_GRO_CB(skb)->csum_cnt = 0; | |
5323 | NAPI_GRO_CB(skb)->csum_valid = 0; | |
5324 | } | |
d565b0a1 | 5325 | |
07d78363 | 5326 | pp = ptype->callbacks.gro_receive(gro_head, skb); |
d565b0a1 HX |
5327 | break; |
5328 | } | |
5329 | rcu_read_unlock(); | |
5330 | ||
5331 | if (&ptype->list == head) | |
5332 | goto normal; | |
5333 | ||
25393d3f SK |
5334 | if (IS_ERR(pp) && PTR_ERR(pp) == -EINPROGRESS) { |
5335 | ret = GRO_CONSUMED; | |
5336 | goto ok; | |
5337 | } | |
5338 | ||
0da2afd5 | 5339 | same_flow = NAPI_GRO_CB(skb)->same_flow; |
5d0d9be8 | 5340 | ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED; |
0da2afd5 | 5341 | |
d565b0a1 | 5342 | if (pp) { |
d4546c25 DM |
5343 | list_del_init(&pp->list); |
5344 | napi_gro_complete(pp); | |
4ae5544f | 5345 | napi->gro_count--; |
6312fe77 | 5346 | napi->gro_hash[hash].count--; |
d565b0a1 HX |
5347 | } |
5348 | ||
0da2afd5 | 5349 | if (same_flow) |
d565b0a1 HX |
5350 | goto ok; |
5351 | ||
600adc18 | 5352 | if (NAPI_GRO_CB(skb)->flush) |
d565b0a1 | 5353 | goto normal; |
d565b0a1 | 5354 | |
6312fe77 LR |
5355 | if (unlikely(napi->gro_hash[hash].count >= MAX_GRO_SKBS)) { |
5356 | gro_flush_oldest(gro_head); | |
600adc18 ED |
5357 | } else { |
5358 | napi->gro_count++; | |
6312fe77 | 5359 | napi->gro_hash[hash].count++; |
600adc18 | 5360 | } |
d565b0a1 | 5361 | NAPI_GRO_CB(skb)->count = 1; |
2e71a6f8 | 5362 | NAPI_GRO_CB(skb)->age = jiffies; |
29e98242 | 5363 | NAPI_GRO_CB(skb)->last = skb; |
86911732 | 5364 | skb_shinfo(skb)->gso_size = skb_gro_len(skb); |
07d78363 | 5365 | list_add(&skb->list, gro_head); |
5d0d9be8 | 5366 | ret = GRO_HELD; |
d565b0a1 | 5367 | |
ad0f9904 | 5368 | pull: |
a50e233c ED |
5369 | grow = skb_gro_offset(skb) - skb_headlen(skb); |
5370 | if (grow > 0) | |
5371 | gro_pull_from_frag0(skb, grow); | |
d565b0a1 | 5372 | ok: |
5d0d9be8 | 5373 | return ret; |
d565b0a1 HX |
5374 | |
5375 | normal: | |
ad0f9904 HX |
5376 | ret = GRO_NORMAL; |
5377 | goto pull; | |
5d38a079 | 5378 | } |
96e93eab | 5379 | |
bf5a755f JC |
5380 | struct packet_offload *gro_find_receive_by_type(__be16 type) |
5381 | { | |
5382 | struct list_head *offload_head = &offload_base; | |
5383 | struct packet_offload *ptype; | |
5384 | ||
5385 | list_for_each_entry_rcu(ptype, offload_head, list) { | |
5386 | if (ptype->type != type || !ptype->callbacks.gro_receive) | |
5387 | continue; | |
5388 | return ptype; | |
5389 | } | |
5390 | return NULL; | |
5391 | } | |
e27a2f83 | 5392 | EXPORT_SYMBOL(gro_find_receive_by_type); |
bf5a755f JC |
5393 | |
5394 | struct packet_offload *gro_find_complete_by_type(__be16 type) | |
5395 | { | |
5396 | struct list_head *offload_head = &offload_base; | |
5397 | struct packet_offload *ptype; | |
5398 | ||
5399 | list_for_each_entry_rcu(ptype, offload_head, list) { | |
5400 | if (ptype->type != type || !ptype->callbacks.gro_complete) | |
5401 | continue; | |
5402 | return ptype; | |
5403 | } | |
5404 | return NULL; | |
5405 | } | |
e27a2f83 | 5406 | EXPORT_SYMBOL(gro_find_complete_by_type); |
5d38a079 | 5407 | |
e44699d2 MK |
5408 | static void napi_skb_free_stolen_head(struct sk_buff *skb) |
5409 | { | |
5410 | skb_dst_drop(skb); | |
5411 | secpath_reset(skb); | |
5412 | kmem_cache_free(skbuff_head_cache, skb); | |
5413 | } | |
5414 | ||
bb728820 | 5415 | static gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb) |
5d38a079 | 5416 | { |
5d0d9be8 HX |
5417 | switch (ret) { |
5418 | case GRO_NORMAL: | |
ae78dbfa | 5419 | if (netif_receive_skb_internal(skb)) |
c7c4b3b6 BH |
5420 | ret = GRO_DROP; |
5421 | break; | |
5d38a079 | 5422 | |
5d0d9be8 | 5423 | case GRO_DROP: |
5d38a079 HX |
5424 | kfree_skb(skb); |
5425 | break; | |
5b252f0c | 5426 | |
daa86548 | 5427 | case GRO_MERGED_FREE: |
e44699d2 MK |
5428 | if (NAPI_GRO_CB(skb)->free == NAPI_GRO_FREE_STOLEN_HEAD) |
5429 | napi_skb_free_stolen_head(skb); | |
5430 | else | |
d7e8883c | 5431 | __kfree_skb(skb); |
daa86548 ED |
5432 | break; |
5433 | ||
5b252f0c BH |
5434 | case GRO_HELD: |
5435 | case GRO_MERGED: | |
25393d3f | 5436 | case GRO_CONSUMED: |
5b252f0c | 5437 | break; |
5d38a079 HX |
5438 | } |
5439 | ||
c7c4b3b6 | 5440 | return ret; |
5d0d9be8 | 5441 | } |
5d0d9be8 | 5442 | |
c7c4b3b6 | 5443 | gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb) |
5d0d9be8 | 5444 | { |
93f93a44 | 5445 | skb_mark_napi_id(skb, napi); |
ae78dbfa | 5446 | trace_napi_gro_receive_entry(skb); |
86911732 | 5447 | |
a50e233c ED |
5448 | skb_gro_reset_offset(skb); |
5449 | ||
89c5fa33 | 5450 | return napi_skb_finish(dev_gro_receive(napi, skb), skb); |
d565b0a1 HX |
5451 | } |
5452 | EXPORT_SYMBOL(napi_gro_receive); | |
5453 | ||
d0c2b0d2 | 5454 | static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb) |
96e93eab | 5455 | { |
93a35f59 ED |
5456 | if (unlikely(skb->pfmemalloc)) { |
5457 | consume_skb(skb); | |
5458 | return; | |
5459 | } | |
96e93eab | 5460 | __skb_pull(skb, skb_headlen(skb)); |
2a2a459e ED |
5461 | /* restore the reserve we had after netdev_alloc_skb_ip_align() */ |
5462 | skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN - skb_headroom(skb)); | |
3701e513 | 5463 | skb->vlan_tci = 0; |
66c46d74 | 5464 | skb->dev = napi->dev; |
6d152e23 | 5465 | skb->skb_iif = 0; |
c3caf119 JC |
5466 | skb->encapsulation = 0; |
5467 | skb_shinfo(skb)->gso_type = 0; | |
e33d0ba8 | 5468 | skb->truesize = SKB_TRUESIZE(skb_end_offset(skb)); |
f991bb9d | 5469 | secpath_reset(skb); |
96e93eab HX |
5470 | |
5471 | napi->skb = skb; | |
5472 | } | |
96e93eab | 5473 | |
76620aaf | 5474 | struct sk_buff *napi_get_frags(struct napi_struct *napi) |
5d38a079 | 5475 | { |
5d38a079 | 5476 | struct sk_buff *skb = napi->skb; |
5d38a079 HX |
5477 | |
5478 | if (!skb) { | |
fd11a83d | 5479 | skb = napi_alloc_skb(napi, GRO_MAX_HEAD); |
e2f9dc3b ED |
5480 | if (skb) { |
5481 | napi->skb = skb; | |
5482 | skb_mark_napi_id(skb, napi); | |
5483 | } | |
80595d59 | 5484 | } |
96e93eab HX |
5485 | return skb; |
5486 | } | |
76620aaf | 5487 | EXPORT_SYMBOL(napi_get_frags); |
96e93eab | 5488 | |
a50e233c ED |
5489 | static gro_result_t napi_frags_finish(struct napi_struct *napi, |
5490 | struct sk_buff *skb, | |
5491 | gro_result_t ret) | |
96e93eab | 5492 | { |
5d0d9be8 HX |
5493 | switch (ret) { |
5494 | case GRO_NORMAL: | |
a50e233c ED |
5495 | case GRO_HELD: |
5496 | __skb_push(skb, ETH_HLEN); | |
5497 | skb->protocol = eth_type_trans(skb, skb->dev); | |
5498 | if (ret == GRO_NORMAL && netif_receive_skb_internal(skb)) | |
c7c4b3b6 | 5499 | ret = GRO_DROP; |
86911732 | 5500 | break; |
5d38a079 | 5501 | |
5d0d9be8 | 5502 | case GRO_DROP: |
5d0d9be8 HX |
5503 | napi_reuse_skb(napi, skb); |
5504 | break; | |
5b252f0c | 5505 | |
e44699d2 MK |
5506 | case GRO_MERGED_FREE: |
5507 | if (NAPI_GRO_CB(skb)->free == NAPI_GRO_FREE_STOLEN_HEAD) | |
5508 | napi_skb_free_stolen_head(skb); | |
5509 | else | |
5510 | napi_reuse_skb(napi, skb); | |
5511 | break; | |
5512 | ||
5b252f0c | 5513 | case GRO_MERGED: |
25393d3f | 5514 | case GRO_CONSUMED: |
5b252f0c | 5515 | break; |
5d0d9be8 | 5516 | } |
5d38a079 | 5517 | |
c7c4b3b6 | 5518 | return ret; |
5d38a079 | 5519 | } |
5d0d9be8 | 5520 | |
a50e233c ED |
5521 | /* Upper GRO stack assumes network header starts at gro_offset=0 |
5522 | * Drivers could call both napi_gro_frags() and napi_gro_receive() | |
5523 | * We copy ethernet header into skb->data to have a common layout. | |
5524 | */ | |
4adb9c4a | 5525 | static struct sk_buff *napi_frags_skb(struct napi_struct *napi) |
76620aaf HX |
5526 | { |
5527 | struct sk_buff *skb = napi->skb; | |
a50e233c ED |
5528 | const struct ethhdr *eth; |
5529 | unsigned int hlen = sizeof(*eth); | |
76620aaf HX |
5530 | |
5531 | napi->skb = NULL; | |
5532 | ||
a50e233c ED |
5533 | skb_reset_mac_header(skb); |
5534 | skb_gro_reset_offset(skb); | |
5535 | ||
5536 | eth = skb_gro_header_fast(skb, 0); | |
5537 | if (unlikely(skb_gro_header_hard(skb, hlen))) { | |
5538 | eth = skb_gro_header_slow(skb, hlen, 0); | |
5539 | if (unlikely(!eth)) { | |
4da46ceb AC |
5540 | net_warn_ratelimited("%s: dropping impossible skb from %s\n", |
5541 | __func__, napi->dev->name); | |
a50e233c ED |
5542 | napi_reuse_skb(napi, skb); |
5543 | return NULL; | |
5544 | } | |
5545 | } else { | |
5546 | gro_pull_from_frag0(skb, hlen); | |
5547 | NAPI_GRO_CB(skb)->frag0 += hlen; | |
5548 | NAPI_GRO_CB(skb)->frag0_len -= hlen; | |
76620aaf | 5549 | } |
a50e233c ED |
5550 | __skb_pull(skb, hlen); |
5551 | ||
5552 | /* | |
5553 | * This works because the only protocols we care about don't require | |
5554 | * special handling. | |
5555 | * We'll fix it up properly in napi_frags_finish() | |
5556 | */ | |
5557 | skb->protocol = eth->h_proto; | |
76620aaf | 5558 | |
76620aaf HX |
5559 | return skb; |
5560 | } | |
76620aaf | 5561 | |
c7c4b3b6 | 5562 | gro_result_t napi_gro_frags(struct napi_struct *napi) |
5d0d9be8 | 5563 | { |
76620aaf | 5564 | struct sk_buff *skb = napi_frags_skb(napi); |
5d0d9be8 HX |
5565 | |
5566 | if (!skb) | |
c7c4b3b6 | 5567 | return GRO_DROP; |
5d0d9be8 | 5568 | |
ae78dbfa BH |
5569 | trace_napi_gro_frags_entry(skb); |
5570 | ||
89c5fa33 | 5571 | return napi_frags_finish(napi, skb, dev_gro_receive(napi, skb)); |
5d0d9be8 | 5572 | } |
5d38a079 HX |
5573 | EXPORT_SYMBOL(napi_gro_frags); |
5574 | ||
573e8fca TH |
5575 | /* Compute the checksum from gro_offset and return the folded value |
5576 | * after adding in any pseudo checksum. | |
5577 | */ | |
5578 | __sum16 __skb_gro_checksum_complete(struct sk_buff *skb) | |
5579 | { | |
5580 | __wsum wsum; | |
5581 | __sum16 sum; | |
5582 | ||
5583 | wsum = skb_checksum(skb, skb_gro_offset(skb), skb_gro_len(skb), 0); | |
5584 | ||
5585 | /* NAPI_GRO_CB(skb)->csum holds pseudo checksum */ | |
5586 | sum = csum_fold(csum_add(NAPI_GRO_CB(skb)->csum, wsum)); | |
5587 | if (likely(!sum)) { | |
5588 | if (unlikely(skb->ip_summed == CHECKSUM_COMPLETE) && | |
5589 | !skb->csum_complete_sw) | |
5590 | netdev_rx_csum_fault(skb->dev); | |
5591 | } | |
5592 | ||
5593 | NAPI_GRO_CB(skb)->csum = wsum; | |
5594 | NAPI_GRO_CB(skb)->csum_valid = 1; | |
5595 | ||
5596 | return sum; | |
5597 | } | |
5598 | EXPORT_SYMBOL(__skb_gro_checksum_complete); | |
5599 | ||
773fc8f6 | 5600 | static void net_rps_send_ipi(struct softnet_data *remsd) |
5601 | { | |
5602 | #ifdef CONFIG_RPS | |
5603 | while (remsd) { | |
5604 | struct softnet_data *next = remsd->rps_ipi_next; | |
5605 | ||
5606 | if (cpu_online(remsd->cpu)) | |
5607 | smp_call_function_single_async(remsd->cpu, &remsd->csd); | |
5608 | remsd = next; | |
5609 | } | |
5610 | #endif | |
5611 | } | |
5612 | ||
e326bed2 | 5613 | /* |
855abcf0 | 5614 | * net_rps_action_and_irq_enable sends any pending IPI's for rps. |
e326bed2 ED |
5615 | * Note: called with local irq disabled, but exits with local irq enabled. |
5616 | */ | |
5617 | static void net_rps_action_and_irq_enable(struct softnet_data *sd) | |
5618 | { | |
5619 | #ifdef CONFIG_RPS | |
5620 | struct softnet_data *remsd = sd->rps_ipi_list; | |
5621 | ||
5622 | if (remsd) { | |
5623 | sd->rps_ipi_list = NULL; | |
5624 | ||
5625 | local_irq_enable(); | |
5626 | ||
5627 | /* Send pending IPI's to kick RPS processing on remote cpus. */ | |
773fc8f6 | 5628 | net_rps_send_ipi(remsd); |
e326bed2 ED |
5629 | } else |
5630 | #endif | |
5631 | local_irq_enable(); | |
5632 | } | |
5633 | ||
d75b1ade ED |
5634 | static bool sd_has_rps_ipi_waiting(struct softnet_data *sd) |
5635 | { | |
5636 | #ifdef CONFIG_RPS | |
5637 | return sd->rps_ipi_list != NULL; | |
5638 | #else | |
5639 | return false; | |
5640 | #endif | |
5641 | } | |
5642 | ||
bea3348e | 5643 | static int process_backlog(struct napi_struct *napi, int quota) |
1da177e4 | 5644 | { |
eecfd7c4 | 5645 | struct softnet_data *sd = container_of(napi, struct softnet_data, backlog); |
145dd5f9 PA |
5646 | bool again = true; |
5647 | int work = 0; | |
1da177e4 | 5648 | |
e326bed2 ED |
5649 | /* Check if we have pending ipi, its better to send them now, |
5650 | * not waiting net_rx_action() end. | |
5651 | */ | |
d75b1ade | 5652 | if (sd_has_rps_ipi_waiting(sd)) { |
e326bed2 ED |
5653 | local_irq_disable(); |
5654 | net_rps_action_and_irq_enable(sd); | |
5655 | } | |
d75b1ade | 5656 | |
3d48b53f | 5657 | napi->weight = dev_rx_weight; |
145dd5f9 | 5658 | while (again) { |
1da177e4 | 5659 | struct sk_buff *skb; |
6e7676c1 CG |
5660 | |
5661 | while ((skb = __skb_dequeue(&sd->process_queue))) { | |
2c17d27c | 5662 | rcu_read_lock(); |
6e7676c1 | 5663 | __netif_receive_skb(skb); |
2c17d27c | 5664 | rcu_read_unlock(); |
76cc8b13 | 5665 | input_queue_head_incr(sd); |
145dd5f9 | 5666 | if (++work >= quota) |
76cc8b13 | 5667 | return work; |
145dd5f9 | 5668 | |
6e7676c1 | 5669 | } |
1da177e4 | 5670 | |
145dd5f9 | 5671 | local_irq_disable(); |
e36fa2f7 | 5672 | rps_lock(sd); |
11ef7a89 | 5673 | if (skb_queue_empty(&sd->input_pkt_queue)) { |
eecfd7c4 ED |
5674 | /* |
5675 | * Inline a custom version of __napi_complete(). | |
5676 | * only current cpu owns and manipulates this napi, | |
11ef7a89 TH |
5677 | * and NAPI_STATE_SCHED is the only possible flag set |
5678 | * on backlog. | |
5679 | * We can use a plain write instead of clear_bit(), | |
eecfd7c4 ED |
5680 | * and we dont need an smp_mb() memory barrier. |
5681 | */ | |
eecfd7c4 | 5682 | napi->state = 0; |
145dd5f9 PA |
5683 | again = false; |
5684 | } else { | |
5685 | skb_queue_splice_tail_init(&sd->input_pkt_queue, | |
5686 | &sd->process_queue); | |
bea3348e | 5687 | } |
e36fa2f7 | 5688 | rps_unlock(sd); |
145dd5f9 | 5689 | local_irq_enable(); |
6e7676c1 | 5690 | } |
1da177e4 | 5691 | |
bea3348e SH |
5692 | return work; |
5693 | } | |
1da177e4 | 5694 | |
bea3348e SH |
5695 | /** |
5696 | * __napi_schedule - schedule for receive | |
c4ea43c5 | 5697 | * @n: entry to schedule |
bea3348e | 5698 | * |
bc9ad166 ED |
5699 | * The entry's receive function will be scheduled to run. |
5700 | * Consider using __napi_schedule_irqoff() if hard irqs are masked. | |
bea3348e | 5701 | */ |
b5606c2d | 5702 | void __napi_schedule(struct napi_struct *n) |
bea3348e SH |
5703 | { |
5704 | unsigned long flags; | |
1da177e4 | 5705 | |
bea3348e | 5706 | local_irq_save(flags); |
903ceff7 | 5707 | ____napi_schedule(this_cpu_ptr(&softnet_data), n); |
bea3348e | 5708 | local_irq_restore(flags); |
1da177e4 | 5709 | } |
bea3348e SH |
5710 | EXPORT_SYMBOL(__napi_schedule); |
5711 | ||
39e6c820 ED |
5712 | /** |
5713 | * napi_schedule_prep - check if napi can be scheduled | |
5714 | * @n: napi context | |
5715 | * | |
5716 | * Test if NAPI routine is already running, and if not mark | |
5717 | * it as running. This is used as a condition variable | |
5718 | * insure only one NAPI poll instance runs. We also make | |
5719 | * sure there is no pending NAPI disable. | |
5720 | */ | |
5721 | bool napi_schedule_prep(struct napi_struct *n) | |
5722 | { | |
5723 | unsigned long val, new; | |
5724 | ||
5725 | do { | |
5726 | val = READ_ONCE(n->state); | |
5727 | if (unlikely(val & NAPIF_STATE_DISABLE)) | |
5728 | return false; | |
5729 | new = val | NAPIF_STATE_SCHED; | |
5730 | ||
5731 | /* Sets STATE_MISSED bit if STATE_SCHED was already set | |
5732 | * This was suggested by Alexander Duyck, as compiler | |
5733 | * emits better code than : | |
5734 | * if (val & NAPIF_STATE_SCHED) | |
5735 | * new |= NAPIF_STATE_MISSED; | |
5736 | */ | |
5737 | new |= (val & NAPIF_STATE_SCHED) / NAPIF_STATE_SCHED * | |
5738 | NAPIF_STATE_MISSED; | |
5739 | } while (cmpxchg(&n->state, val, new) != val); | |
5740 | ||
5741 | return !(val & NAPIF_STATE_SCHED); | |
5742 | } | |
5743 | EXPORT_SYMBOL(napi_schedule_prep); | |
5744 | ||
bc9ad166 ED |
5745 | /** |
5746 | * __napi_schedule_irqoff - schedule for receive | |
5747 | * @n: entry to schedule | |
5748 | * | |
5749 | * Variant of __napi_schedule() assuming hard irqs are masked | |
5750 | */ | |
5751 | void __napi_schedule_irqoff(struct napi_struct *n) | |
5752 | { | |
5753 | ____napi_schedule(this_cpu_ptr(&softnet_data), n); | |
5754 | } | |
5755 | EXPORT_SYMBOL(__napi_schedule_irqoff); | |
5756 | ||
364b6055 | 5757 | bool napi_complete_done(struct napi_struct *n, int work_done) |
d565b0a1 | 5758 | { |
39e6c820 | 5759 | unsigned long flags, val, new; |
d565b0a1 HX |
5760 | |
5761 | /* | |
217f6974 ED |
5762 | * 1) Don't let napi dequeue from the cpu poll list |
5763 | * just in case its running on a different cpu. | |
5764 | * 2) If we are busy polling, do nothing here, we have | |
5765 | * the guarantee we will be called later. | |
d565b0a1 | 5766 | */ |
217f6974 ED |
5767 | if (unlikely(n->state & (NAPIF_STATE_NPSVC | |
5768 | NAPIF_STATE_IN_BUSY_POLL))) | |
364b6055 | 5769 | return false; |
d565b0a1 | 5770 | |
07d78363 | 5771 | if (n->gro_count) { |
3b47d303 | 5772 | unsigned long timeout = 0; |
d75b1ade | 5773 | |
3b47d303 ED |
5774 | if (work_done) |
5775 | timeout = n->dev->gro_flush_timeout; | |
5776 | ||
5777 | if (timeout) | |
5778 | hrtimer_start(&n->timer, ns_to_ktime(timeout), | |
5779 | HRTIMER_MODE_REL_PINNED); | |
5780 | else | |
5781 | napi_gro_flush(n, false); | |
5782 | } | |
02c1602e | 5783 | if (unlikely(!list_empty(&n->poll_list))) { |
d75b1ade ED |
5784 | /* If n->poll_list is not empty, we need to mask irqs */ |
5785 | local_irq_save(flags); | |
02c1602e | 5786 | list_del_init(&n->poll_list); |
d75b1ade ED |
5787 | local_irq_restore(flags); |
5788 | } | |
39e6c820 ED |
5789 | |
5790 | do { | |
5791 | val = READ_ONCE(n->state); | |
5792 | ||
5793 | WARN_ON_ONCE(!(val & NAPIF_STATE_SCHED)); | |
5794 | ||
5795 | new = val & ~(NAPIF_STATE_MISSED | NAPIF_STATE_SCHED); | |
5796 | ||
5797 | /* If STATE_MISSED was set, leave STATE_SCHED set, | |
5798 | * because we will call napi->poll() one more time. | |
5799 | * This C code was suggested by Alexander Duyck to help gcc. | |
5800 | */ | |
5801 | new |= (val & NAPIF_STATE_MISSED) / NAPIF_STATE_MISSED * | |
5802 | NAPIF_STATE_SCHED; | |
5803 | } while (cmpxchg(&n->state, val, new) != val); | |
5804 | ||
5805 | if (unlikely(val & NAPIF_STATE_MISSED)) { | |
5806 | __napi_schedule(n); | |
5807 | return false; | |
5808 | } | |
5809 | ||
364b6055 | 5810 | return true; |
d565b0a1 | 5811 | } |
3b47d303 | 5812 | EXPORT_SYMBOL(napi_complete_done); |
d565b0a1 | 5813 | |
af12fa6e | 5814 | /* must be called under rcu_read_lock(), as we dont take a reference */ |
02d62e86 | 5815 | static struct napi_struct *napi_by_id(unsigned int napi_id) |
af12fa6e ET |
5816 | { |
5817 | unsigned int hash = napi_id % HASH_SIZE(napi_hash); | |
5818 | struct napi_struct *napi; | |
5819 | ||
5820 | hlist_for_each_entry_rcu(napi, &napi_hash[hash], napi_hash_node) | |
5821 | if (napi->napi_id == napi_id) | |
5822 | return napi; | |
5823 | ||
5824 | return NULL; | |
5825 | } | |
02d62e86 ED |
5826 | |
5827 | #if defined(CONFIG_NET_RX_BUSY_POLL) | |
217f6974 | 5828 | |
ce6aea93 | 5829 | #define BUSY_POLL_BUDGET 8 |
217f6974 ED |
5830 | |
5831 | static void busy_poll_stop(struct napi_struct *napi, void *have_poll_lock) | |
5832 | { | |
5833 | int rc; | |
5834 | ||
39e6c820 ED |
5835 | /* Busy polling means there is a high chance device driver hard irq |
5836 | * could not grab NAPI_STATE_SCHED, and that NAPI_STATE_MISSED was | |
5837 | * set in napi_schedule_prep(). | |
5838 | * Since we are about to call napi->poll() once more, we can safely | |
5839 | * clear NAPI_STATE_MISSED. | |
5840 | * | |
5841 | * Note: x86 could use a single "lock and ..." instruction | |
5842 | * to perform these two clear_bit() | |
5843 | */ | |
5844 | clear_bit(NAPI_STATE_MISSED, &napi->state); | |
217f6974 ED |
5845 | clear_bit(NAPI_STATE_IN_BUSY_POLL, &napi->state); |
5846 | ||
5847 | local_bh_disable(); | |
5848 | ||
5849 | /* All we really want here is to re-enable device interrupts. | |
5850 | * Ideally, a new ndo_busy_poll_stop() could avoid another round. | |
5851 | */ | |
5852 | rc = napi->poll(napi, BUSY_POLL_BUDGET); | |
1e22391e | 5853 | trace_napi_poll(napi, rc, BUSY_POLL_BUDGET); |
217f6974 ED |
5854 | netpoll_poll_unlock(have_poll_lock); |
5855 | if (rc == BUSY_POLL_BUDGET) | |
5856 | __napi_schedule(napi); | |
5857 | local_bh_enable(); | |
217f6974 ED |
5858 | } |
5859 | ||
7db6b048 SS |
5860 | void napi_busy_loop(unsigned int napi_id, |
5861 | bool (*loop_end)(void *, unsigned long), | |
5862 | void *loop_end_arg) | |
02d62e86 | 5863 | { |
7db6b048 | 5864 | unsigned long start_time = loop_end ? busy_loop_current_time() : 0; |
217f6974 | 5865 | int (*napi_poll)(struct napi_struct *napi, int budget); |
217f6974 | 5866 | void *have_poll_lock = NULL; |
02d62e86 | 5867 | struct napi_struct *napi; |
217f6974 ED |
5868 | |
5869 | restart: | |
217f6974 | 5870 | napi_poll = NULL; |
02d62e86 | 5871 | |
2a028ecb | 5872 | rcu_read_lock(); |
02d62e86 | 5873 | |
545cd5e5 | 5874 | napi = napi_by_id(napi_id); |
02d62e86 ED |
5875 | if (!napi) |
5876 | goto out; | |
5877 | ||
217f6974 ED |
5878 | preempt_disable(); |
5879 | for (;;) { | |
2b5cd0df AD |
5880 | int work = 0; |
5881 | ||
2a028ecb | 5882 | local_bh_disable(); |
217f6974 ED |
5883 | if (!napi_poll) { |
5884 | unsigned long val = READ_ONCE(napi->state); | |
5885 | ||
5886 | /* If multiple threads are competing for this napi, | |
5887 | * we avoid dirtying napi->state as much as we can. | |
5888 | */ | |
5889 | if (val & (NAPIF_STATE_DISABLE | NAPIF_STATE_SCHED | | |
5890 | NAPIF_STATE_IN_BUSY_POLL)) | |
5891 | goto count; | |
5892 | if (cmpxchg(&napi->state, val, | |
5893 | val | NAPIF_STATE_IN_BUSY_POLL | | |
5894 | NAPIF_STATE_SCHED) != val) | |
5895 | goto count; | |
5896 | have_poll_lock = netpoll_poll_lock(napi); | |
5897 | napi_poll = napi->poll; | |
5898 | } | |
2b5cd0df AD |
5899 | work = napi_poll(napi, BUSY_POLL_BUDGET); |
5900 | trace_napi_poll(napi, work, BUSY_POLL_BUDGET); | |
217f6974 | 5901 | count: |
2b5cd0df | 5902 | if (work > 0) |
7db6b048 | 5903 | __NET_ADD_STATS(dev_net(napi->dev), |
2b5cd0df | 5904 | LINUX_MIB_BUSYPOLLRXPACKETS, work); |
2a028ecb | 5905 | local_bh_enable(); |
02d62e86 | 5906 | |
7db6b048 | 5907 | if (!loop_end || loop_end(loop_end_arg, start_time)) |
217f6974 | 5908 | break; |
02d62e86 | 5909 | |
217f6974 ED |
5910 | if (unlikely(need_resched())) { |
5911 | if (napi_poll) | |
5912 | busy_poll_stop(napi, have_poll_lock); | |
5913 | preempt_enable(); | |
5914 | rcu_read_unlock(); | |
5915 | cond_resched(); | |
7db6b048 | 5916 | if (loop_end(loop_end_arg, start_time)) |
2b5cd0df | 5917 | return; |
217f6974 ED |
5918 | goto restart; |
5919 | } | |
6cdf89b1 | 5920 | cpu_relax(); |
217f6974 ED |
5921 | } |
5922 | if (napi_poll) | |
5923 | busy_poll_stop(napi, have_poll_lock); | |
5924 | preempt_enable(); | |
02d62e86 | 5925 | out: |
2a028ecb | 5926 | rcu_read_unlock(); |
02d62e86 | 5927 | } |
7db6b048 | 5928 | EXPORT_SYMBOL(napi_busy_loop); |
02d62e86 ED |
5929 | |
5930 | #endif /* CONFIG_NET_RX_BUSY_POLL */ | |
af12fa6e | 5931 | |
149d6ad8 | 5932 | static void napi_hash_add(struct napi_struct *napi) |
af12fa6e | 5933 | { |
d64b5e85 ED |
5934 | if (test_bit(NAPI_STATE_NO_BUSY_POLL, &napi->state) || |
5935 | test_and_set_bit(NAPI_STATE_HASHED, &napi->state)) | |
52bd2d62 | 5936 | return; |
af12fa6e | 5937 | |
52bd2d62 | 5938 | spin_lock(&napi_hash_lock); |
af12fa6e | 5939 | |
545cd5e5 | 5940 | /* 0..NR_CPUS range is reserved for sender_cpu use */ |
52bd2d62 | 5941 | do { |
545cd5e5 AD |
5942 | if (unlikely(++napi_gen_id < MIN_NAPI_ID)) |
5943 | napi_gen_id = MIN_NAPI_ID; | |
52bd2d62 ED |
5944 | } while (napi_by_id(napi_gen_id)); |
5945 | napi->napi_id = napi_gen_id; | |
af12fa6e | 5946 | |
52bd2d62 ED |
5947 | hlist_add_head_rcu(&napi->napi_hash_node, |
5948 | &napi_hash[napi->napi_id % HASH_SIZE(napi_hash)]); | |
af12fa6e | 5949 | |
52bd2d62 | 5950 | spin_unlock(&napi_hash_lock); |
af12fa6e | 5951 | } |
af12fa6e ET |
5952 | |
5953 | /* Warning : caller is responsible to make sure rcu grace period | |
5954 | * is respected before freeing memory containing @napi | |
5955 | */ | |
34cbe27e | 5956 | bool napi_hash_del(struct napi_struct *napi) |
af12fa6e | 5957 | { |
34cbe27e ED |
5958 | bool rcu_sync_needed = false; |
5959 | ||
af12fa6e ET |
5960 | spin_lock(&napi_hash_lock); |
5961 | ||
34cbe27e ED |
5962 | if (test_and_clear_bit(NAPI_STATE_HASHED, &napi->state)) { |
5963 | rcu_sync_needed = true; | |
af12fa6e | 5964 | hlist_del_rcu(&napi->napi_hash_node); |
34cbe27e | 5965 | } |
af12fa6e | 5966 | spin_unlock(&napi_hash_lock); |
34cbe27e | 5967 | return rcu_sync_needed; |
af12fa6e ET |
5968 | } |
5969 | EXPORT_SYMBOL_GPL(napi_hash_del); | |
5970 | ||
3b47d303 ED |
5971 | static enum hrtimer_restart napi_watchdog(struct hrtimer *timer) |
5972 | { | |
5973 | struct napi_struct *napi; | |
5974 | ||
5975 | napi = container_of(timer, struct napi_struct, timer); | |
39e6c820 ED |
5976 | |
5977 | /* Note : we use a relaxed variant of napi_schedule_prep() not setting | |
5978 | * NAPI_STATE_MISSED, since we do not react to a device IRQ. | |
5979 | */ | |
07d78363 | 5980 | if (napi->gro_count && !napi_disable_pending(napi) && |
39e6c820 ED |
5981 | !test_and_set_bit(NAPI_STATE_SCHED, &napi->state)) |
5982 | __napi_schedule_irqoff(napi); | |
3b47d303 ED |
5983 | |
5984 | return HRTIMER_NORESTART; | |
5985 | } | |
5986 | ||
d565b0a1 HX |
5987 | void netif_napi_add(struct net_device *dev, struct napi_struct *napi, |
5988 | int (*poll)(struct napi_struct *, int), int weight) | |
5989 | { | |
07d78363 DM |
5990 | int i; |
5991 | ||
d565b0a1 | 5992 | INIT_LIST_HEAD(&napi->poll_list); |
3b47d303 ED |
5993 | hrtimer_init(&napi->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_PINNED); |
5994 | napi->timer.function = napi_watchdog; | |
4ae5544f | 5995 | napi->gro_count = 0; |
6312fe77 LR |
5996 | for (i = 0; i < GRO_HASH_BUCKETS; i++) { |
5997 | INIT_LIST_HEAD(&napi->gro_hash[i].list); | |
5998 | napi->gro_hash[i].count = 0; | |
5999 | } | |
5d38a079 | 6000 | napi->skb = NULL; |
d565b0a1 | 6001 | napi->poll = poll; |
82dc3c63 ED |
6002 | if (weight > NAPI_POLL_WEIGHT) |
6003 | pr_err_once("netif_napi_add() called with weight %d on device %s\n", | |
6004 | weight, dev->name); | |
d565b0a1 HX |
6005 | napi->weight = weight; |
6006 | list_add(&napi->dev_list, &dev->napi_list); | |
d565b0a1 | 6007 | napi->dev = dev; |
5d38a079 | 6008 | #ifdef CONFIG_NETPOLL |
d565b0a1 HX |
6009 | napi->poll_owner = -1; |
6010 | #endif | |
6011 | set_bit(NAPI_STATE_SCHED, &napi->state); | |
93d05d4a | 6012 | napi_hash_add(napi); |
d565b0a1 HX |
6013 | } |
6014 | EXPORT_SYMBOL(netif_napi_add); | |
6015 | ||
3b47d303 ED |
6016 | void napi_disable(struct napi_struct *n) |
6017 | { | |
6018 | might_sleep(); | |
6019 | set_bit(NAPI_STATE_DISABLE, &n->state); | |
6020 | ||
6021 | while (test_and_set_bit(NAPI_STATE_SCHED, &n->state)) | |
6022 | msleep(1); | |
2d8bff12 NH |
6023 | while (test_and_set_bit(NAPI_STATE_NPSVC, &n->state)) |
6024 | msleep(1); | |
3b47d303 ED |
6025 | |
6026 | hrtimer_cancel(&n->timer); | |
6027 | ||
6028 | clear_bit(NAPI_STATE_DISABLE, &n->state); | |
6029 | } | |
6030 | EXPORT_SYMBOL(napi_disable); | |
6031 | ||
07d78363 | 6032 | static void flush_gro_hash(struct napi_struct *napi) |
d4546c25 | 6033 | { |
07d78363 | 6034 | int i; |
d4546c25 | 6035 | |
07d78363 DM |
6036 | for (i = 0; i < GRO_HASH_BUCKETS; i++) { |
6037 | struct sk_buff *skb, *n; | |
6038 | ||
6312fe77 | 6039 | list_for_each_entry_safe(skb, n, &napi->gro_hash[i].list, list) |
07d78363 | 6040 | kfree_skb(skb); |
6312fe77 | 6041 | napi->gro_hash[i].count = 0; |
07d78363 | 6042 | } |
d4546c25 DM |
6043 | } |
6044 | ||
93d05d4a | 6045 | /* Must be called in process context */ |
d565b0a1 HX |
6046 | void netif_napi_del(struct napi_struct *napi) |
6047 | { | |
93d05d4a ED |
6048 | might_sleep(); |
6049 | if (napi_hash_del(napi)) | |
6050 | synchronize_net(); | |
d7b06636 | 6051 | list_del_init(&napi->dev_list); |
76620aaf | 6052 | napi_free_frags(napi); |
d565b0a1 | 6053 | |
07d78363 | 6054 | flush_gro_hash(napi); |
4ae5544f | 6055 | napi->gro_count = 0; |
d565b0a1 HX |
6056 | } |
6057 | EXPORT_SYMBOL(netif_napi_del); | |
6058 | ||
726ce70e HX |
6059 | static int napi_poll(struct napi_struct *n, struct list_head *repoll) |
6060 | { | |
6061 | void *have; | |
6062 | int work, weight; | |
6063 | ||
6064 | list_del_init(&n->poll_list); | |
6065 | ||
6066 | have = netpoll_poll_lock(n); | |
6067 | ||
6068 | weight = n->weight; | |
6069 | ||
6070 | /* This NAPI_STATE_SCHED test is for avoiding a race | |
6071 | * with netpoll's poll_napi(). Only the entity which | |
6072 | * obtains the lock and sees NAPI_STATE_SCHED set will | |
6073 | * actually make the ->poll() call. Therefore we avoid | |
6074 | * accidentally calling ->poll() when NAPI is not scheduled. | |
6075 | */ | |
6076 | work = 0; | |
6077 | if (test_bit(NAPI_STATE_SCHED, &n->state)) { | |
6078 | work = n->poll(n, weight); | |
1db19db7 | 6079 | trace_napi_poll(n, work, weight); |
726ce70e HX |
6080 | } |
6081 | ||
6082 | WARN_ON_ONCE(work > weight); | |
6083 | ||
6084 | if (likely(work < weight)) | |
6085 | goto out_unlock; | |
6086 | ||
6087 | /* Drivers must not modify the NAPI state if they | |
6088 | * consume the entire weight. In such cases this code | |
6089 | * still "owns" the NAPI instance and therefore can | |
6090 | * move the instance around on the list at-will. | |
6091 | */ | |
6092 | if (unlikely(napi_disable_pending(n))) { | |
6093 | napi_complete(n); | |
6094 | goto out_unlock; | |
6095 | } | |
6096 | ||
07d78363 | 6097 | if (n->gro_count) { |
726ce70e HX |
6098 | /* flush too old packets |
6099 | * If HZ < 1000, flush all packets. | |
6100 | */ | |
6101 | napi_gro_flush(n, HZ >= 1000); | |
6102 | } | |
6103 | ||
001ce546 HX |
6104 | /* Some drivers may have called napi_schedule |
6105 | * prior to exhausting their budget. | |
6106 | */ | |
6107 | if (unlikely(!list_empty(&n->poll_list))) { | |
6108 | pr_warn_once("%s: Budget exhausted after napi rescheduled\n", | |
6109 | n->dev ? n->dev->name : "backlog"); | |
6110 | goto out_unlock; | |
6111 | } | |
6112 | ||
726ce70e HX |
6113 | list_add_tail(&n->poll_list, repoll); |
6114 | ||
6115 | out_unlock: | |
6116 | netpoll_poll_unlock(have); | |
6117 | ||
6118 | return work; | |
6119 | } | |
6120 | ||
0766f788 | 6121 | static __latent_entropy void net_rx_action(struct softirq_action *h) |
1da177e4 | 6122 | { |
903ceff7 | 6123 | struct softnet_data *sd = this_cpu_ptr(&softnet_data); |
7acf8a1e MW |
6124 | unsigned long time_limit = jiffies + |
6125 | usecs_to_jiffies(netdev_budget_usecs); | |
51b0bded | 6126 | int budget = netdev_budget; |
d75b1ade ED |
6127 | LIST_HEAD(list); |
6128 | LIST_HEAD(repoll); | |
53fb95d3 | 6129 | |
1da177e4 | 6130 | local_irq_disable(); |
d75b1ade ED |
6131 | list_splice_init(&sd->poll_list, &list); |
6132 | local_irq_enable(); | |
1da177e4 | 6133 | |
ceb8d5bf | 6134 | for (;;) { |
bea3348e | 6135 | struct napi_struct *n; |
1da177e4 | 6136 | |
ceb8d5bf HX |
6137 | if (list_empty(&list)) { |
6138 | if (!sd_has_rps_ipi_waiting(sd) && list_empty(&repoll)) | |
f52dffe0 | 6139 | goto out; |
ceb8d5bf HX |
6140 | break; |
6141 | } | |
6142 | ||
6bd373eb HX |
6143 | n = list_first_entry(&list, struct napi_struct, poll_list); |
6144 | budget -= napi_poll(n, &repoll); | |
6145 | ||
d75b1ade | 6146 | /* If softirq window is exhausted then punt. |
24f8b238 SH |
6147 | * Allow this to run for 2 jiffies since which will allow |
6148 | * an average latency of 1.5/HZ. | |
bea3348e | 6149 | */ |
ceb8d5bf HX |
6150 | if (unlikely(budget <= 0 || |
6151 | time_after_eq(jiffies, time_limit))) { | |
6152 | sd->time_squeeze++; | |
6153 | break; | |
6154 | } | |
1da177e4 | 6155 | } |
d75b1ade | 6156 | |
d75b1ade ED |
6157 | local_irq_disable(); |
6158 | ||
6159 | list_splice_tail_init(&sd->poll_list, &list); | |
6160 | list_splice_tail(&repoll, &list); | |
6161 | list_splice(&list, &sd->poll_list); | |
6162 | if (!list_empty(&sd->poll_list)) | |
6163 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); | |
6164 | ||
e326bed2 | 6165 | net_rps_action_and_irq_enable(sd); |
f52dffe0 ED |
6166 | out: |
6167 | __kfree_skb_flush(); | |
1da177e4 LT |
6168 | } |
6169 | ||
aa9d8560 | 6170 | struct netdev_adjacent { |
9ff162a8 | 6171 | struct net_device *dev; |
5d261913 VF |
6172 | |
6173 | /* upper master flag, there can only be one master device per list */ | |
9ff162a8 | 6174 | bool master; |
5d261913 | 6175 | |
5d261913 VF |
6176 | /* counter for the number of times this device was added to us */ |
6177 | u16 ref_nr; | |
6178 | ||
402dae96 VF |
6179 | /* private field for the users */ |
6180 | void *private; | |
6181 | ||
9ff162a8 JP |
6182 | struct list_head list; |
6183 | struct rcu_head rcu; | |
9ff162a8 JP |
6184 | }; |
6185 | ||
6ea29da1 | 6186 | static struct netdev_adjacent *__netdev_find_adj(struct net_device *adj_dev, |
2f268f12 | 6187 | struct list_head *adj_list) |
9ff162a8 | 6188 | { |
5d261913 | 6189 | struct netdev_adjacent *adj; |
5d261913 | 6190 | |
2f268f12 | 6191 | list_for_each_entry(adj, adj_list, list) { |
5d261913 VF |
6192 | if (adj->dev == adj_dev) |
6193 | return adj; | |
9ff162a8 JP |
6194 | } |
6195 | return NULL; | |
6196 | } | |
6197 | ||
f1170fd4 DA |
6198 | static int __netdev_has_upper_dev(struct net_device *upper_dev, void *data) |
6199 | { | |
6200 | struct net_device *dev = data; | |
6201 | ||
6202 | return upper_dev == dev; | |
6203 | } | |
6204 | ||
9ff162a8 JP |
6205 | /** |
6206 | * netdev_has_upper_dev - Check if device is linked to an upper device | |
6207 | * @dev: device | |
6208 | * @upper_dev: upper device to check | |
6209 | * | |
6210 | * Find out if a device is linked to specified upper device and return true | |
6211 | * in case it is. Note that this checks only immediate upper device, | |
6212 | * not through a complete stack of devices. The caller must hold the RTNL lock. | |
6213 | */ | |
6214 | bool netdev_has_upper_dev(struct net_device *dev, | |
6215 | struct net_device *upper_dev) | |
6216 | { | |
6217 | ASSERT_RTNL(); | |
6218 | ||
f1170fd4 DA |
6219 | return netdev_walk_all_upper_dev_rcu(dev, __netdev_has_upper_dev, |
6220 | upper_dev); | |
9ff162a8 JP |
6221 | } |
6222 | EXPORT_SYMBOL(netdev_has_upper_dev); | |
6223 | ||
1a3f060c DA |
6224 | /** |
6225 | * netdev_has_upper_dev_all - Check if device is linked to an upper device | |
6226 | * @dev: device | |
6227 | * @upper_dev: upper device to check | |
6228 | * | |
6229 | * Find out if a device is linked to specified upper device and return true | |
6230 | * in case it is. Note that this checks the entire upper device chain. | |
6231 | * The caller must hold rcu lock. | |
6232 | */ | |
6233 | ||
1a3f060c DA |
6234 | bool netdev_has_upper_dev_all_rcu(struct net_device *dev, |
6235 | struct net_device *upper_dev) | |
6236 | { | |
6237 | return !!netdev_walk_all_upper_dev_rcu(dev, __netdev_has_upper_dev, | |
6238 | upper_dev); | |
6239 | } | |
6240 | EXPORT_SYMBOL(netdev_has_upper_dev_all_rcu); | |
6241 | ||
9ff162a8 JP |
6242 | /** |
6243 | * netdev_has_any_upper_dev - Check if device is linked to some device | |
6244 | * @dev: device | |
6245 | * | |
6246 | * Find out if a device is linked to an upper device and return true in case | |
6247 | * it is. The caller must hold the RTNL lock. | |
6248 | */ | |
25cc72a3 | 6249 | bool netdev_has_any_upper_dev(struct net_device *dev) |
9ff162a8 JP |
6250 | { |
6251 | ASSERT_RTNL(); | |
6252 | ||
f1170fd4 | 6253 | return !list_empty(&dev->adj_list.upper); |
9ff162a8 | 6254 | } |
25cc72a3 | 6255 | EXPORT_SYMBOL(netdev_has_any_upper_dev); |
9ff162a8 JP |
6256 | |
6257 | /** | |
6258 | * netdev_master_upper_dev_get - Get master upper device | |
6259 | * @dev: device | |
6260 | * | |
6261 | * Find a master upper device and return pointer to it or NULL in case | |
6262 | * it's not there. The caller must hold the RTNL lock. | |
6263 | */ | |
6264 | struct net_device *netdev_master_upper_dev_get(struct net_device *dev) | |
6265 | { | |
aa9d8560 | 6266 | struct netdev_adjacent *upper; |
9ff162a8 JP |
6267 | |
6268 | ASSERT_RTNL(); | |
6269 | ||
2f268f12 | 6270 | if (list_empty(&dev->adj_list.upper)) |
9ff162a8 JP |
6271 | return NULL; |
6272 | ||
2f268f12 | 6273 | upper = list_first_entry(&dev->adj_list.upper, |
aa9d8560 | 6274 | struct netdev_adjacent, list); |
9ff162a8 JP |
6275 | if (likely(upper->master)) |
6276 | return upper->dev; | |
6277 | return NULL; | |
6278 | } | |
6279 | EXPORT_SYMBOL(netdev_master_upper_dev_get); | |
6280 | ||
0f524a80 DA |
6281 | /** |
6282 | * netdev_has_any_lower_dev - Check if device is linked to some device | |
6283 | * @dev: device | |
6284 | * | |
6285 | * Find out if a device is linked to a lower device and return true in case | |
6286 | * it is. The caller must hold the RTNL lock. | |
6287 | */ | |
6288 | static bool netdev_has_any_lower_dev(struct net_device *dev) | |
6289 | { | |
6290 | ASSERT_RTNL(); | |
6291 | ||
6292 | return !list_empty(&dev->adj_list.lower); | |
6293 | } | |
6294 | ||
b6ccba4c VF |
6295 | void *netdev_adjacent_get_private(struct list_head *adj_list) |
6296 | { | |
6297 | struct netdev_adjacent *adj; | |
6298 | ||
6299 | adj = list_entry(adj_list, struct netdev_adjacent, list); | |
6300 | ||
6301 | return adj->private; | |
6302 | } | |
6303 | EXPORT_SYMBOL(netdev_adjacent_get_private); | |
6304 | ||
44a40855 VY |
6305 | /** |
6306 | * netdev_upper_get_next_dev_rcu - Get the next dev from upper list | |
6307 | * @dev: device | |
6308 | * @iter: list_head ** of the current position | |
6309 | * | |
6310 | * Gets the next device from the dev's upper list, starting from iter | |
6311 | * position. The caller must hold RCU read lock. | |
6312 | */ | |
6313 | struct net_device *netdev_upper_get_next_dev_rcu(struct net_device *dev, | |
6314 | struct list_head **iter) | |
6315 | { | |
6316 | struct netdev_adjacent *upper; | |
6317 | ||
6318 | WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held()); | |
6319 | ||
6320 | upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); | |
6321 | ||
6322 | if (&upper->list == &dev->adj_list.upper) | |
6323 | return NULL; | |
6324 | ||
6325 | *iter = &upper->list; | |
6326 | ||
6327 | return upper->dev; | |
6328 | } | |
6329 | EXPORT_SYMBOL(netdev_upper_get_next_dev_rcu); | |
6330 | ||
1a3f060c DA |
6331 | static struct net_device *netdev_next_upper_dev_rcu(struct net_device *dev, |
6332 | struct list_head **iter) | |
6333 | { | |
6334 | struct netdev_adjacent *upper; | |
6335 | ||
6336 | WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held()); | |
6337 | ||
6338 | upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); | |
6339 | ||
6340 | if (&upper->list == &dev->adj_list.upper) | |
6341 | return NULL; | |
6342 | ||
6343 | *iter = &upper->list; | |
6344 | ||
6345 | return upper->dev; | |
6346 | } | |
6347 | ||
6348 | int netdev_walk_all_upper_dev_rcu(struct net_device *dev, | |
6349 | int (*fn)(struct net_device *dev, | |
6350 | void *data), | |
6351 | void *data) | |
6352 | { | |
6353 | struct net_device *udev; | |
6354 | struct list_head *iter; | |
6355 | int ret; | |
6356 | ||
6357 | for (iter = &dev->adj_list.upper, | |
6358 | udev = netdev_next_upper_dev_rcu(dev, &iter); | |
6359 | udev; | |
6360 | udev = netdev_next_upper_dev_rcu(dev, &iter)) { | |
6361 | /* first is the upper device itself */ | |
6362 | ret = fn(udev, data); | |
6363 | if (ret) | |
6364 | return ret; | |
6365 | ||
6366 | /* then look at all of its upper devices */ | |
6367 | ret = netdev_walk_all_upper_dev_rcu(udev, fn, data); | |
6368 | if (ret) | |
6369 | return ret; | |
6370 | } | |
6371 | ||
6372 | return 0; | |
6373 | } | |
6374 | EXPORT_SYMBOL_GPL(netdev_walk_all_upper_dev_rcu); | |
6375 | ||
31088a11 VF |
6376 | /** |
6377 | * netdev_lower_get_next_private - Get the next ->private from the | |
6378 | * lower neighbour list | |
6379 | * @dev: device | |
6380 | * @iter: list_head ** of the current position | |
6381 | * | |
6382 | * Gets the next netdev_adjacent->private from the dev's lower neighbour | |
6383 | * list, starting from iter position. The caller must hold either hold the | |
6384 | * RTNL lock or its own locking that guarantees that the neighbour lower | |
b469139e | 6385 | * list will remain unchanged. |
31088a11 VF |
6386 | */ |
6387 | void *netdev_lower_get_next_private(struct net_device *dev, | |
6388 | struct list_head **iter) | |
6389 | { | |
6390 | struct netdev_adjacent *lower; | |
6391 | ||
6392 | lower = list_entry(*iter, struct netdev_adjacent, list); | |
6393 | ||
6394 | if (&lower->list == &dev->adj_list.lower) | |
6395 | return NULL; | |
6396 | ||
6859e7df | 6397 | *iter = lower->list.next; |
31088a11 VF |
6398 | |
6399 | return lower->private; | |
6400 | } | |
6401 | EXPORT_SYMBOL(netdev_lower_get_next_private); | |
6402 | ||
6403 | /** | |
6404 | * netdev_lower_get_next_private_rcu - Get the next ->private from the | |
6405 | * lower neighbour list, RCU | |
6406 | * variant | |
6407 | * @dev: device | |
6408 | * @iter: list_head ** of the current position | |
6409 | * | |
6410 | * Gets the next netdev_adjacent->private from the dev's lower neighbour | |
6411 | * list, starting from iter position. The caller must hold RCU read lock. | |
6412 | */ | |
6413 | void *netdev_lower_get_next_private_rcu(struct net_device *dev, | |
6414 | struct list_head **iter) | |
6415 | { | |
6416 | struct netdev_adjacent *lower; | |
6417 | ||
6418 | WARN_ON_ONCE(!rcu_read_lock_held()); | |
6419 | ||
6420 | lower = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); | |
6421 | ||
6422 | if (&lower->list == &dev->adj_list.lower) | |
6423 | return NULL; | |
6424 | ||
6859e7df | 6425 | *iter = &lower->list; |
31088a11 VF |
6426 | |
6427 | return lower->private; | |
6428 | } | |
6429 | EXPORT_SYMBOL(netdev_lower_get_next_private_rcu); | |
6430 | ||
4085ebe8 VY |
6431 | /** |
6432 | * netdev_lower_get_next - Get the next device from the lower neighbour | |
6433 | * list | |
6434 | * @dev: device | |
6435 | * @iter: list_head ** of the current position | |
6436 | * | |
6437 | * Gets the next netdev_adjacent from the dev's lower neighbour | |
6438 | * list, starting from iter position. The caller must hold RTNL lock or | |
6439 | * its own locking that guarantees that the neighbour lower | |
b469139e | 6440 | * list will remain unchanged. |
4085ebe8 VY |
6441 | */ |
6442 | void *netdev_lower_get_next(struct net_device *dev, struct list_head **iter) | |
6443 | { | |
6444 | struct netdev_adjacent *lower; | |
6445 | ||
cfdd28be | 6446 | lower = list_entry(*iter, struct netdev_adjacent, list); |
4085ebe8 VY |
6447 | |
6448 | if (&lower->list == &dev->adj_list.lower) | |
6449 | return NULL; | |
6450 | ||
cfdd28be | 6451 | *iter = lower->list.next; |
4085ebe8 VY |
6452 | |
6453 | return lower->dev; | |
6454 | } | |
6455 | EXPORT_SYMBOL(netdev_lower_get_next); | |
6456 | ||
1a3f060c DA |
6457 | static struct net_device *netdev_next_lower_dev(struct net_device *dev, |
6458 | struct list_head **iter) | |
6459 | { | |
6460 | struct netdev_adjacent *lower; | |
6461 | ||
46b5ab1a | 6462 | lower = list_entry((*iter)->next, struct netdev_adjacent, list); |
1a3f060c DA |
6463 | |
6464 | if (&lower->list == &dev->adj_list.lower) | |
6465 | return NULL; | |
6466 | ||
46b5ab1a | 6467 | *iter = &lower->list; |
1a3f060c DA |
6468 | |
6469 | return lower->dev; | |
6470 | } | |
6471 | ||
6472 | int netdev_walk_all_lower_dev(struct net_device *dev, | |
6473 | int (*fn)(struct net_device *dev, | |
6474 | void *data), | |
6475 | void *data) | |
6476 | { | |
6477 | struct net_device *ldev; | |
6478 | struct list_head *iter; | |
6479 | int ret; | |
6480 | ||
6481 | for (iter = &dev->adj_list.lower, | |
6482 | ldev = netdev_next_lower_dev(dev, &iter); | |
6483 | ldev; | |
6484 | ldev = netdev_next_lower_dev(dev, &iter)) { | |
6485 | /* first is the lower device itself */ | |
6486 | ret = fn(ldev, data); | |
6487 | if (ret) | |
6488 | return ret; | |
6489 | ||
6490 | /* then look at all of its lower devices */ | |
6491 | ret = netdev_walk_all_lower_dev(ldev, fn, data); | |
6492 | if (ret) | |
6493 | return ret; | |
6494 | } | |
6495 | ||
6496 | return 0; | |
6497 | } | |
6498 | EXPORT_SYMBOL_GPL(netdev_walk_all_lower_dev); | |
6499 | ||
1a3f060c DA |
6500 | static struct net_device *netdev_next_lower_dev_rcu(struct net_device *dev, |
6501 | struct list_head **iter) | |
6502 | { | |
6503 | struct netdev_adjacent *lower; | |
6504 | ||
6505 | lower = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); | |
6506 | if (&lower->list == &dev->adj_list.lower) | |
6507 | return NULL; | |
6508 | ||
6509 | *iter = &lower->list; | |
6510 | ||
6511 | return lower->dev; | |
6512 | } | |
6513 | ||
6514 | int netdev_walk_all_lower_dev_rcu(struct net_device *dev, | |
6515 | int (*fn)(struct net_device *dev, | |
6516 | void *data), | |
6517 | void *data) | |
6518 | { | |
6519 | struct net_device *ldev; | |
6520 | struct list_head *iter; | |
6521 | int ret; | |
6522 | ||
6523 | for (iter = &dev->adj_list.lower, | |
6524 | ldev = netdev_next_lower_dev_rcu(dev, &iter); | |
6525 | ldev; | |
6526 | ldev = netdev_next_lower_dev_rcu(dev, &iter)) { | |
6527 | /* first is the lower device itself */ | |
6528 | ret = fn(ldev, data); | |
6529 | if (ret) | |
6530 | return ret; | |
6531 | ||
6532 | /* then look at all of its lower devices */ | |
6533 | ret = netdev_walk_all_lower_dev_rcu(ldev, fn, data); | |
6534 | if (ret) | |
6535 | return ret; | |
6536 | } | |
6537 | ||
6538 | return 0; | |
6539 | } | |
6540 | EXPORT_SYMBOL_GPL(netdev_walk_all_lower_dev_rcu); | |
6541 | ||
e001bfad | 6542 | /** |
6543 | * netdev_lower_get_first_private_rcu - Get the first ->private from the | |
6544 | * lower neighbour list, RCU | |
6545 | * variant | |
6546 | * @dev: device | |
6547 | * | |
6548 | * Gets the first netdev_adjacent->private from the dev's lower neighbour | |
6549 | * list. The caller must hold RCU read lock. | |
6550 | */ | |
6551 | void *netdev_lower_get_first_private_rcu(struct net_device *dev) | |
6552 | { | |
6553 | struct netdev_adjacent *lower; | |
6554 | ||
6555 | lower = list_first_or_null_rcu(&dev->adj_list.lower, | |
6556 | struct netdev_adjacent, list); | |
6557 | if (lower) | |
6558 | return lower->private; | |
6559 | return NULL; | |
6560 | } | |
6561 | EXPORT_SYMBOL(netdev_lower_get_first_private_rcu); | |
6562 | ||
9ff162a8 JP |
6563 | /** |
6564 | * netdev_master_upper_dev_get_rcu - Get master upper device | |
6565 | * @dev: device | |
6566 | * | |
6567 | * Find a master upper device and return pointer to it or NULL in case | |
6568 | * it's not there. The caller must hold the RCU read lock. | |
6569 | */ | |
6570 | struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev) | |
6571 | { | |
aa9d8560 | 6572 | struct netdev_adjacent *upper; |
9ff162a8 | 6573 | |
2f268f12 | 6574 | upper = list_first_or_null_rcu(&dev->adj_list.upper, |
aa9d8560 | 6575 | struct netdev_adjacent, list); |
9ff162a8 JP |
6576 | if (upper && likely(upper->master)) |
6577 | return upper->dev; | |
6578 | return NULL; | |
6579 | } | |
6580 | EXPORT_SYMBOL(netdev_master_upper_dev_get_rcu); | |
6581 | ||
0a59f3a9 | 6582 | static int netdev_adjacent_sysfs_add(struct net_device *dev, |
3ee32707 VF |
6583 | struct net_device *adj_dev, |
6584 | struct list_head *dev_list) | |
6585 | { | |
6586 | char linkname[IFNAMSIZ+7]; | |
f4563a75 | 6587 | |
3ee32707 VF |
6588 | sprintf(linkname, dev_list == &dev->adj_list.upper ? |
6589 | "upper_%s" : "lower_%s", adj_dev->name); | |
6590 | return sysfs_create_link(&(dev->dev.kobj), &(adj_dev->dev.kobj), | |
6591 | linkname); | |
6592 | } | |
0a59f3a9 | 6593 | static void netdev_adjacent_sysfs_del(struct net_device *dev, |
3ee32707 VF |
6594 | char *name, |
6595 | struct list_head *dev_list) | |
6596 | { | |
6597 | char linkname[IFNAMSIZ+7]; | |
f4563a75 | 6598 | |
3ee32707 VF |
6599 | sprintf(linkname, dev_list == &dev->adj_list.upper ? |
6600 | "upper_%s" : "lower_%s", name); | |
6601 | sysfs_remove_link(&(dev->dev.kobj), linkname); | |
6602 | } | |
6603 | ||
7ce64c79 AF |
6604 | static inline bool netdev_adjacent_is_neigh_list(struct net_device *dev, |
6605 | struct net_device *adj_dev, | |
6606 | struct list_head *dev_list) | |
6607 | { | |
6608 | return (dev_list == &dev->adj_list.upper || | |
6609 | dev_list == &dev->adj_list.lower) && | |
6610 | net_eq(dev_net(dev), dev_net(adj_dev)); | |
6611 | } | |
3ee32707 | 6612 | |
5d261913 VF |
6613 | static int __netdev_adjacent_dev_insert(struct net_device *dev, |
6614 | struct net_device *adj_dev, | |
7863c054 | 6615 | struct list_head *dev_list, |
402dae96 | 6616 | void *private, bool master) |
5d261913 VF |
6617 | { |
6618 | struct netdev_adjacent *adj; | |
842d67a7 | 6619 | int ret; |
5d261913 | 6620 | |
6ea29da1 | 6621 | adj = __netdev_find_adj(adj_dev, dev_list); |
5d261913 VF |
6622 | |
6623 | if (adj) { | |
790510d9 | 6624 | adj->ref_nr += 1; |
67b62f98 DA |
6625 | pr_debug("Insert adjacency: dev %s adj_dev %s adj->ref_nr %d\n", |
6626 | dev->name, adj_dev->name, adj->ref_nr); | |
6627 | ||
5d261913 VF |
6628 | return 0; |
6629 | } | |
6630 | ||
6631 | adj = kmalloc(sizeof(*adj), GFP_KERNEL); | |
6632 | if (!adj) | |
6633 | return -ENOMEM; | |
6634 | ||
6635 | adj->dev = adj_dev; | |
6636 | adj->master = master; | |
790510d9 | 6637 | adj->ref_nr = 1; |
402dae96 | 6638 | adj->private = private; |
5d261913 | 6639 | dev_hold(adj_dev); |
2f268f12 | 6640 | |
67b62f98 DA |
6641 | pr_debug("Insert adjacency: dev %s adj_dev %s adj->ref_nr %d; dev_hold on %s\n", |
6642 | dev->name, adj_dev->name, adj->ref_nr, adj_dev->name); | |
5d261913 | 6643 | |
7ce64c79 | 6644 | if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list)) { |
3ee32707 | 6645 | ret = netdev_adjacent_sysfs_add(dev, adj_dev, dev_list); |
5831d66e VF |
6646 | if (ret) |
6647 | goto free_adj; | |
6648 | } | |
6649 | ||
7863c054 | 6650 | /* Ensure that master link is always the first item in list. */ |
842d67a7 VF |
6651 | if (master) { |
6652 | ret = sysfs_create_link(&(dev->dev.kobj), | |
6653 | &(adj_dev->dev.kobj), "master"); | |
6654 | if (ret) | |
5831d66e | 6655 | goto remove_symlinks; |
842d67a7 | 6656 | |
7863c054 | 6657 | list_add_rcu(&adj->list, dev_list); |
842d67a7 | 6658 | } else { |
7863c054 | 6659 | list_add_tail_rcu(&adj->list, dev_list); |
842d67a7 | 6660 | } |
5d261913 VF |
6661 | |
6662 | return 0; | |
842d67a7 | 6663 | |
5831d66e | 6664 | remove_symlinks: |
7ce64c79 | 6665 | if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list)) |
3ee32707 | 6666 | netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list); |
842d67a7 VF |
6667 | free_adj: |
6668 | kfree(adj); | |
974daef7 | 6669 | dev_put(adj_dev); |
842d67a7 VF |
6670 | |
6671 | return ret; | |
5d261913 VF |
6672 | } |
6673 | ||
1d143d9f | 6674 | static void __netdev_adjacent_dev_remove(struct net_device *dev, |
6675 | struct net_device *adj_dev, | |
93409033 | 6676 | u16 ref_nr, |
1d143d9f | 6677 | struct list_head *dev_list) |
5d261913 VF |
6678 | { |
6679 | struct netdev_adjacent *adj; | |
6680 | ||
67b62f98 DA |
6681 | pr_debug("Remove adjacency: dev %s adj_dev %s ref_nr %d\n", |
6682 | dev->name, adj_dev->name, ref_nr); | |
6683 | ||
6ea29da1 | 6684 | adj = __netdev_find_adj(adj_dev, dev_list); |
5d261913 | 6685 | |
2f268f12 | 6686 | if (!adj) { |
67b62f98 | 6687 | pr_err("Adjacency does not exist for device %s from %s\n", |
2f268f12 | 6688 | dev->name, adj_dev->name); |
67b62f98 DA |
6689 | WARN_ON(1); |
6690 | return; | |
2f268f12 | 6691 | } |
5d261913 | 6692 | |
93409033 | 6693 | if (adj->ref_nr > ref_nr) { |
67b62f98 DA |
6694 | pr_debug("adjacency: %s to %s ref_nr - %d = %d\n", |
6695 | dev->name, adj_dev->name, ref_nr, | |
6696 | adj->ref_nr - ref_nr); | |
93409033 | 6697 | adj->ref_nr -= ref_nr; |
5d261913 VF |
6698 | return; |
6699 | } | |
6700 | ||
842d67a7 VF |
6701 | if (adj->master) |
6702 | sysfs_remove_link(&(dev->dev.kobj), "master"); | |
6703 | ||
7ce64c79 | 6704 | if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list)) |
3ee32707 | 6705 | netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list); |
5831d66e | 6706 | |
5d261913 | 6707 | list_del_rcu(&adj->list); |
67b62f98 | 6708 | pr_debug("adjacency: dev_put for %s, because link removed from %s to %s\n", |
2f268f12 | 6709 | adj_dev->name, dev->name, adj_dev->name); |
5d261913 VF |
6710 | dev_put(adj_dev); |
6711 | kfree_rcu(adj, rcu); | |
6712 | } | |
6713 | ||
1d143d9f | 6714 | static int __netdev_adjacent_dev_link_lists(struct net_device *dev, |
6715 | struct net_device *upper_dev, | |
6716 | struct list_head *up_list, | |
6717 | struct list_head *down_list, | |
6718 | void *private, bool master) | |
5d261913 VF |
6719 | { |
6720 | int ret; | |
6721 | ||
790510d9 | 6722 | ret = __netdev_adjacent_dev_insert(dev, upper_dev, up_list, |
93409033 | 6723 | private, master); |
5d261913 VF |
6724 | if (ret) |
6725 | return ret; | |
6726 | ||
790510d9 | 6727 | ret = __netdev_adjacent_dev_insert(upper_dev, dev, down_list, |
93409033 | 6728 | private, false); |
5d261913 | 6729 | if (ret) { |
790510d9 | 6730 | __netdev_adjacent_dev_remove(dev, upper_dev, 1, up_list); |
5d261913 VF |
6731 | return ret; |
6732 | } | |
6733 | ||
6734 | return 0; | |
6735 | } | |
6736 | ||
1d143d9f | 6737 | static void __netdev_adjacent_dev_unlink_lists(struct net_device *dev, |
6738 | struct net_device *upper_dev, | |
93409033 | 6739 | u16 ref_nr, |
1d143d9f | 6740 | struct list_head *up_list, |
6741 | struct list_head *down_list) | |
5d261913 | 6742 | { |
93409033 AC |
6743 | __netdev_adjacent_dev_remove(dev, upper_dev, ref_nr, up_list); |
6744 | __netdev_adjacent_dev_remove(upper_dev, dev, ref_nr, down_list); | |
5d261913 VF |
6745 | } |
6746 | ||
1d143d9f | 6747 | static int __netdev_adjacent_dev_link_neighbour(struct net_device *dev, |
6748 | struct net_device *upper_dev, | |
6749 | void *private, bool master) | |
2f268f12 | 6750 | { |
f1170fd4 DA |
6751 | return __netdev_adjacent_dev_link_lists(dev, upper_dev, |
6752 | &dev->adj_list.upper, | |
6753 | &upper_dev->adj_list.lower, | |
6754 | private, master); | |
5d261913 VF |
6755 | } |
6756 | ||
1d143d9f | 6757 | static void __netdev_adjacent_dev_unlink_neighbour(struct net_device *dev, |
6758 | struct net_device *upper_dev) | |
2f268f12 | 6759 | { |
93409033 | 6760 | __netdev_adjacent_dev_unlink_lists(dev, upper_dev, 1, |
2f268f12 VF |
6761 | &dev->adj_list.upper, |
6762 | &upper_dev->adj_list.lower); | |
6763 | } | |
5d261913 | 6764 | |
9ff162a8 | 6765 | static int __netdev_upper_dev_link(struct net_device *dev, |
402dae96 | 6766 | struct net_device *upper_dev, bool master, |
42ab19ee DA |
6767 | void *upper_priv, void *upper_info, |
6768 | struct netlink_ext_ack *extack) | |
9ff162a8 | 6769 | { |
51d0c047 DA |
6770 | struct netdev_notifier_changeupper_info changeupper_info = { |
6771 | .info = { | |
6772 | .dev = dev, | |
42ab19ee | 6773 | .extack = extack, |
51d0c047 DA |
6774 | }, |
6775 | .upper_dev = upper_dev, | |
6776 | .master = master, | |
6777 | .linking = true, | |
6778 | .upper_info = upper_info, | |
6779 | }; | |
50d629e7 | 6780 | struct net_device *master_dev; |
5d261913 | 6781 | int ret = 0; |
9ff162a8 JP |
6782 | |
6783 | ASSERT_RTNL(); | |
6784 | ||
6785 | if (dev == upper_dev) | |
6786 | return -EBUSY; | |
6787 | ||
6788 | /* To prevent loops, check if dev is not upper device to upper_dev. */ | |
f1170fd4 | 6789 | if (netdev_has_upper_dev(upper_dev, dev)) |
9ff162a8 JP |
6790 | return -EBUSY; |
6791 | ||
50d629e7 MM |
6792 | if (!master) { |
6793 | if (netdev_has_upper_dev(dev, upper_dev)) | |
6794 | return -EEXIST; | |
6795 | } else { | |
6796 | master_dev = netdev_master_upper_dev_get(dev); | |
6797 | if (master_dev) | |
6798 | return master_dev == upper_dev ? -EEXIST : -EBUSY; | |
6799 | } | |
9ff162a8 | 6800 | |
51d0c047 | 6801 | ret = call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER, |
573c7ba0 JP |
6802 | &changeupper_info.info); |
6803 | ret = notifier_to_errno(ret); | |
6804 | if (ret) | |
6805 | return ret; | |
6806 | ||
6dffb044 | 6807 | ret = __netdev_adjacent_dev_link_neighbour(dev, upper_dev, upper_priv, |
402dae96 | 6808 | master); |
5d261913 VF |
6809 | if (ret) |
6810 | return ret; | |
9ff162a8 | 6811 | |
51d0c047 | 6812 | ret = call_netdevice_notifiers_info(NETDEV_CHANGEUPPER, |
b03804e7 IS |
6813 | &changeupper_info.info); |
6814 | ret = notifier_to_errno(ret); | |
6815 | if (ret) | |
f1170fd4 | 6816 | goto rollback; |
b03804e7 | 6817 | |
9ff162a8 | 6818 | return 0; |
5d261913 | 6819 | |
f1170fd4 | 6820 | rollback: |
2f268f12 | 6821 | __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev); |
5d261913 VF |
6822 | |
6823 | return ret; | |
9ff162a8 JP |
6824 | } |
6825 | ||
6826 | /** | |
6827 | * netdev_upper_dev_link - Add a link to the upper device | |
6828 | * @dev: device | |
6829 | * @upper_dev: new upper device | |
7a006d59 | 6830 | * @extack: netlink extended ack |
9ff162a8 JP |
6831 | * |
6832 | * Adds a link to device which is upper to this one. The caller must hold | |
6833 | * the RTNL lock. On a failure a negative errno code is returned. | |
6834 | * On success the reference counts are adjusted and the function | |
6835 | * returns zero. | |
6836 | */ | |
6837 | int netdev_upper_dev_link(struct net_device *dev, | |
42ab19ee DA |
6838 | struct net_device *upper_dev, |
6839 | struct netlink_ext_ack *extack) | |
9ff162a8 | 6840 | { |
42ab19ee DA |
6841 | return __netdev_upper_dev_link(dev, upper_dev, false, |
6842 | NULL, NULL, extack); | |
9ff162a8 JP |
6843 | } |
6844 | EXPORT_SYMBOL(netdev_upper_dev_link); | |
6845 | ||
6846 | /** | |
6847 | * netdev_master_upper_dev_link - Add a master link to the upper device | |
6848 | * @dev: device | |
6849 | * @upper_dev: new upper device | |
6dffb044 | 6850 | * @upper_priv: upper device private |
29bf24af | 6851 | * @upper_info: upper info to be passed down via notifier |
7a006d59 | 6852 | * @extack: netlink extended ack |
9ff162a8 JP |
6853 | * |
6854 | * Adds a link to device which is upper to this one. In this case, only | |
6855 | * one master upper device can be linked, although other non-master devices | |
6856 | * might be linked as well. The caller must hold the RTNL lock. | |
6857 | * On a failure a negative errno code is returned. On success the reference | |
6858 | * counts are adjusted and the function returns zero. | |
6859 | */ | |
6860 | int netdev_master_upper_dev_link(struct net_device *dev, | |
6dffb044 | 6861 | struct net_device *upper_dev, |
42ab19ee DA |
6862 | void *upper_priv, void *upper_info, |
6863 | struct netlink_ext_ack *extack) | |
9ff162a8 | 6864 | { |
29bf24af | 6865 | return __netdev_upper_dev_link(dev, upper_dev, true, |
42ab19ee | 6866 | upper_priv, upper_info, extack); |
9ff162a8 JP |
6867 | } |
6868 | EXPORT_SYMBOL(netdev_master_upper_dev_link); | |
6869 | ||
6870 | /** | |
6871 | * netdev_upper_dev_unlink - Removes a link to upper device | |
6872 | * @dev: device | |
6873 | * @upper_dev: new upper device | |
6874 | * | |
6875 | * Removes a link to device which is upper to this one. The caller must hold | |
6876 | * the RTNL lock. | |
6877 | */ | |
6878 | void netdev_upper_dev_unlink(struct net_device *dev, | |
6879 | struct net_device *upper_dev) | |
6880 | { | |
51d0c047 DA |
6881 | struct netdev_notifier_changeupper_info changeupper_info = { |
6882 | .info = { | |
6883 | .dev = dev, | |
6884 | }, | |
6885 | .upper_dev = upper_dev, | |
6886 | .linking = false, | |
6887 | }; | |
f4563a75 | 6888 | |
9ff162a8 JP |
6889 | ASSERT_RTNL(); |
6890 | ||
0e4ead9d | 6891 | changeupper_info.master = netdev_master_upper_dev_get(dev) == upper_dev; |
0e4ead9d | 6892 | |
51d0c047 | 6893 | call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER, |
573c7ba0 JP |
6894 | &changeupper_info.info); |
6895 | ||
2f268f12 | 6896 | __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev); |
5d261913 | 6897 | |
51d0c047 | 6898 | call_netdevice_notifiers_info(NETDEV_CHANGEUPPER, |
0e4ead9d | 6899 | &changeupper_info.info); |
9ff162a8 JP |
6900 | } |
6901 | EXPORT_SYMBOL(netdev_upper_dev_unlink); | |
6902 | ||
61bd3857 MS |
6903 | /** |
6904 | * netdev_bonding_info_change - Dispatch event about slave change | |
6905 | * @dev: device | |
4a26e453 | 6906 | * @bonding_info: info to dispatch |
61bd3857 MS |
6907 | * |
6908 | * Send NETDEV_BONDING_INFO to netdev notifiers with info. | |
6909 | * The caller must hold the RTNL lock. | |
6910 | */ | |
6911 | void netdev_bonding_info_change(struct net_device *dev, | |
6912 | struct netdev_bonding_info *bonding_info) | |
6913 | { | |
51d0c047 DA |
6914 | struct netdev_notifier_bonding_info info = { |
6915 | .info.dev = dev, | |
6916 | }; | |
61bd3857 MS |
6917 | |
6918 | memcpy(&info.bonding_info, bonding_info, | |
6919 | sizeof(struct netdev_bonding_info)); | |
51d0c047 | 6920 | call_netdevice_notifiers_info(NETDEV_BONDING_INFO, |
61bd3857 MS |
6921 | &info.info); |
6922 | } | |
6923 | EXPORT_SYMBOL(netdev_bonding_info_change); | |
6924 | ||
2ce1ee17 | 6925 | static void netdev_adjacent_add_links(struct net_device *dev) |
4c75431a AF |
6926 | { |
6927 | struct netdev_adjacent *iter; | |
6928 | ||
6929 | struct net *net = dev_net(dev); | |
6930 | ||
6931 | list_for_each_entry(iter, &dev->adj_list.upper, list) { | |
be4da0e3 | 6932 | if (!net_eq(net, dev_net(iter->dev))) |
4c75431a AF |
6933 | continue; |
6934 | netdev_adjacent_sysfs_add(iter->dev, dev, | |
6935 | &iter->dev->adj_list.lower); | |
6936 | netdev_adjacent_sysfs_add(dev, iter->dev, | |
6937 | &dev->adj_list.upper); | |
6938 | } | |
6939 | ||
6940 | list_for_each_entry(iter, &dev->adj_list.lower, list) { | |
be4da0e3 | 6941 | if (!net_eq(net, dev_net(iter->dev))) |
4c75431a AF |
6942 | continue; |
6943 | netdev_adjacent_sysfs_add(iter->dev, dev, | |
6944 | &iter->dev->adj_list.upper); | |
6945 | netdev_adjacent_sysfs_add(dev, iter->dev, | |
6946 | &dev->adj_list.lower); | |
6947 | } | |
6948 | } | |
6949 | ||
2ce1ee17 | 6950 | static void netdev_adjacent_del_links(struct net_device *dev) |
4c75431a AF |
6951 | { |
6952 | struct netdev_adjacent *iter; | |
6953 | ||
6954 | struct net *net = dev_net(dev); | |
6955 | ||
6956 | list_for_each_entry(iter, &dev->adj_list.upper, list) { | |
be4da0e3 | 6957 | if (!net_eq(net, dev_net(iter->dev))) |
4c75431a AF |
6958 | continue; |
6959 | netdev_adjacent_sysfs_del(iter->dev, dev->name, | |
6960 | &iter->dev->adj_list.lower); | |
6961 | netdev_adjacent_sysfs_del(dev, iter->dev->name, | |
6962 | &dev->adj_list.upper); | |
6963 | } | |
6964 | ||
6965 | list_for_each_entry(iter, &dev->adj_list.lower, list) { | |
be4da0e3 | 6966 | if (!net_eq(net, dev_net(iter->dev))) |
4c75431a AF |
6967 | continue; |
6968 | netdev_adjacent_sysfs_del(iter->dev, dev->name, | |
6969 | &iter->dev->adj_list.upper); | |
6970 | netdev_adjacent_sysfs_del(dev, iter->dev->name, | |
6971 | &dev->adj_list.lower); | |
6972 | } | |
6973 | } | |
6974 | ||
5bb025fa | 6975 | void netdev_adjacent_rename_links(struct net_device *dev, char *oldname) |
402dae96 | 6976 | { |
5bb025fa | 6977 | struct netdev_adjacent *iter; |
402dae96 | 6978 | |
4c75431a AF |
6979 | struct net *net = dev_net(dev); |
6980 | ||
5bb025fa | 6981 | list_for_each_entry(iter, &dev->adj_list.upper, list) { |
be4da0e3 | 6982 | if (!net_eq(net, dev_net(iter->dev))) |
4c75431a | 6983 | continue; |
5bb025fa VF |
6984 | netdev_adjacent_sysfs_del(iter->dev, oldname, |
6985 | &iter->dev->adj_list.lower); | |
6986 | netdev_adjacent_sysfs_add(iter->dev, dev, | |
6987 | &iter->dev->adj_list.lower); | |
6988 | } | |
402dae96 | 6989 | |
5bb025fa | 6990 | list_for_each_entry(iter, &dev->adj_list.lower, list) { |
be4da0e3 | 6991 | if (!net_eq(net, dev_net(iter->dev))) |
4c75431a | 6992 | continue; |
5bb025fa VF |
6993 | netdev_adjacent_sysfs_del(iter->dev, oldname, |
6994 | &iter->dev->adj_list.upper); | |
6995 | netdev_adjacent_sysfs_add(iter->dev, dev, | |
6996 | &iter->dev->adj_list.upper); | |
6997 | } | |
402dae96 | 6998 | } |
402dae96 VF |
6999 | |
7000 | void *netdev_lower_dev_get_private(struct net_device *dev, | |
7001 | struct net_device *lower_dev) | |
7002 | { | |
7003 | struct netdev_adjacent *lower; | |
7004 | ||
7005 | if (!lower_dev) | |
7006 | return NULL; | |
6ea29da1 | 7007 | lower = __netdev_find_adj(lower_dev, &dev->adj_list.lower); |
402dae96 VF |
7008 | if (!lower) |
7009 | return NULL; | |
7010 | ||
7011 | return lower->private; | |
7012 | } | |
7013 | EXPORT_SYMBOL(netdev_lower_dev_get_private); | |
7014 | ||
4085ebe8 | 7015 | |
952fcfd0 | 7016 | int dev_get_nest_level(struct net_device *dev) |
4085ebe8 VY |
7017 | { |
7018 | struct net_device *lower = NULL; | |
7019 | struct list_head *iter; | |
7020 | int max_nest = -1; | |
7021 | int nest; | |
7022 | ||
7023 | ASSERT_RTNL(); | |
7024 | ||
7025 | netdev_for_each_lower_dev(dev, lower, iter) { | |
952fcfd0 | 7026 | nest = dev_get_nest_level(lower); |
4085ebe8 VY |
7027 | if (max_nest < nest) |
7028 | max_nest = nest; | |
7029 | } | |
7030 | ||
952fcfd0 | 7031 | return max_nest + 1; |
4085ebe8 VY |
7032 | } |
7033 | EXPORT_SYMBOL(dev_get_nest_level); | |
7034 | ||
04d48266 JP |
7035 | /** |
7036 | * netdev_lower_change - Dispatch event about lower device state change | |
7037 | * @lower_dev: device | |
7038 | * @lower_state_info: state to dispatch | |
7039 | * | |
7040 | * Send NETDEV_CHANGELOWERSTATE to netdev notifiers with info. | |
7041 | * The caller must hold the RTNL lock. | |
7042 | */ | |
7043 | void netdev_lower_state_changed(struct net_device *lower_dev, | |
7044 | void *lower_state_info) | |
7045 | { | |
51d0c047 DA |
7046 | struct netdev_notifier_changelowerstate_info changelowerstate_info = { |
7047 | .info.dev = lower_dev, | |
7048 | }; | |
04d48266 JP |
7049 | |
7050 | ASSERT_RTNL(); | |
7051 | changelowerstate_info.lower_state_info = lower_state_info; | |
51d0c047 | 7052 | call_netdevice_notifiers_info(NETDEV_CHANGELOWERSTATE, |
04d48266 JP |
7053 | &changelowerstate_info.info); |
7054 | } | |
7055 | EXPORT_SYMBOL(netdev_lower_state_changed); | |
7056 | ||
b6c40d68 PM |
7057 | static void dev_change_rx_flags(struct net_device *dev, int flags) |
7058 | { | |
d314774c SH |
7059 | const struct net_device_ops *ops = dev->netdev_ops; |
7060 | ||
d2615bf4 | 7061 | if (ops->ndo_change_rx_flags) |
d314774c | 7062 | ops->ndo_change_rx_flags(dev, flags); |
b6c40d68 PM |
7063 | } |
7064 | ||
991fb3f7 | 7065 | static int __dev_set_promiscuity(struct net_device *dev, int inc, bool notify) |
1da177e4 | 7066 | { |
b536db93 | 7067 | unsigned int old_flags = dev->flags; |
d04a48b0 EB |
7068 | kuid_t uid; |
7069 | kgid_t gid; | |
1da177e4 | 7070 | |
24023451 PM |
7071 | ASSERT_RTNL(); |
7072 | ||
dad9b335 WC |
7073 | dev->flags |= IFF_PROMISC; |
7074 | dev->promiscuity += inc; | |
7075 | if (dev->promiscuity == 0) { | |
7076 | /* | |
7077 | * Avoid overflow. | |
7078 | * If inc causes overflow, untouch promisc and return error. | |
7079 | */ | |
7080 | if (inc < 0) | |
7081 | dev->flags &= ~IFF_PROMISC; | |
7082 | else { | |
7083 | dev->promiscuity -= inc; | |
7b6cd1ce JP |
7084 | pr_warn("%s: promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n", |
7085 | dev->name); | |
dad9b335 WC |
7086 | return -EOVERFLOW; |
7087 | } | |
7088 | } | |
52609c0b | 7089 | if (dev->flags != old_flags) { |
7b6cd1ce JP |
7090 | pr_info("device %s %s promiscuous mode\n", |
7091 | dev->name, | |
7092 | dev->flags & IFF_PROMISC ? "entered" : "left"); | |
8192b0c4 DH |
7093 | if (audit_enabled) { |
7094 | current_uid_gid(&uid, &gid); | |
cdfb6b34 RGB |
7095 | audit_log(audit_context(), GFP_ATOMIC, |
7096 | AUDIT_ANOM_PROMISCUOUS, | |
7097 | "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u", | |
7098 | dev->name, (dev->flags & IFF_PROMISC), | |
7099 | (old_flags & IFF_PROMISC), | |
7100 | from_kuid(&init_user_ns, audit_get_loginuid(current)), | |
7101 | from_kuid(&init_user_ns, uid), | |
7102 | from_kgid(&init_user_ns, gid), | |
7103 | audit_get_sessionid(current)); | |
8192b0c4 | 7104 | } |
24023451 | 7105 | |
b6c40d68 | 7106 | dev_change_rx_flags(dev, IFF_PROMISC); |
1da177e4 | 7107 | } |
991fb3f7 ND |
7108 | if (notify) |
7109 | __dev_notify_flags(dev, old_flags, IFF_PROMISC); | |
dad9b335 | 7110 | return 0; |
1da177e4 LT |
7111 | } |
7112 | ||
4417da66 PM |
7113 | /** |
7114 | * dev_set_promiscuity - update promiscuity count on a device | |
7115 | * @dev: device | |
7116 | * @inc: modifier | |
7117 | * | |
7118 | * Add or remove promiscuity from a device. While the count in the device | |
7119 | * remains above zero the interface remains promiscuous. Once it hits zero | |
7120 | * the device reverts back to normal filtering operation. A negative inc | |
7121 | * value is used to drop promiscuity on the device. | |
dad9b335 | 7122 | * Return 0 if successful or a negative errno code on error. |
4417da66 | 7123 | */ |
dad9b335 | 7124 | int dev_set_promiscuity(struct net_device *dev, int inc) |
4417da66 | 7125 | { |
b536db93 | 7126 | unsigned int old_flags = dev->flags; |
dad9b335 | 7127 | int err; |
4417da66 | 7128 | |
991fb3f7 | 7129 | err = __dev_set_promiscuity(dev, inc, true); |
4b5a698e | 7130 | if (err < 0) |
dad9b335 | 7131 | return err; |
4417da66 PM |
7132 | if (dev->flags != old_flags) |
7133 | dev_set_rx_mode(dev); | |
dad9b335 | 7134 | return err; |
4417da66 | 7135 | } |
d1b19dff | 7136 | EXPORT_SYMBOL(dev_set_promiscuity); |
4417da66 | 7137 | |
991fb3f7 | 7138 | static int __dev_set_allmulti(struct net_device *dev, int inc, bool notify) |
1da177e4 | 7139 | { |
991fb3f7 | 7140 | unsigned int old_flags = dev->flags, old_gflags = dev->gflags; |
1da177e4 | 7141 | |
24023451 PM |
7142 | ASSERT_RTNL(); |
7143 | ||
1da177e4 | 7144 | dev->flags |= IFF_ALLMULTI; |
dad9b335 WC |
7145 | dev->allmulti += inc; |
7146 | if (dev->allmulti == 0) { | |
7147 | /* | |
7148 | * Avoid overflow. | |
7149 | * If inc causes overflow, untouch allmulti and return error. | |
7150 | */ | |
7151 | if (inc < 0) | |
7152 | dev->flags &= ~IFF_ALLMULTI; | |
7153 | else { | |
7154 | dev->allmulti -= inc; | |
7b6cd1ce JP |
7155 | pr_warn("%s: allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n", |
7156 | dev->name); | |
dad9b335 WC |
7157 | return -EOVERFLOW; |
7158 | } | |
7159 | } | |
24023451 | 7160 | if (dev->flags ^ old_flags) { |
b6c40d68 | 7161 | dev_change_rx_flags(dev, IFF_ALLMULTI); |
4417da66 | 7162 | dev_set_rx_mode(dev); |
991fb3f7 ND |
7163 | if (notify) |
7164 | __dev_notify_flags(dev, old_flags, | |
7165 | dev->gflags ^ old_gflags); | |
24023451 | 7166 | } |
dad9b335 | 7167 | return 0; |
4417da66 | 7168 | } |
991fb3f7 ND |
7169 | |
7170 | /** | |
7171 | * dev_set_allmulti - update allmulti count on a device | |
7172 | * @dev: device | |
7173 | * @inc: modifier | |
7174 | * | |
7175 | * Add or remove reception of all multicast frames to a device. While the | |
7176 | * count in the device remains above zero the interface remains listening | |
7177 | * to all interfaces. Once it hits zero the device reverts back to normal | |
7178 | * filtering operation. A negative @inc value is used to drop the counter | |
7179 | * when releasing a resource needing all multicasts. | |
7180 | * Return 0 if successful or a negative errno code on error. | |
7181 | */ | |
7182 | ||
7183 | int dev_set_allmulti(struct net_device *dev, int inc) | |
7184 | { | |
7185 | return __dev_set_allmulti(dev, inc, true); | |
7186 | } | |
d1b19dff | 7187 | EXPORT_SYMBOL(dev_set_allmulti); |
4417da66 PM |
7188 | |
7189 | /* | |
7190 | * Upload unicast and multicast address lists to device and | |
7191 | * configure RX filtering. When the device doesn't support unicast | |
53ccaae1 | 7192 | * filtering it is put in promiscuous mode while unicast addresses |
4417da66 PM |
7193 | * are present. |
7194 | */ | |
7195 | void __dev_set_rx_mode(struct net_device *dev) | |
7196 | { | |
d314774c SH |
7197 | const struct net_device_ops *ops = dev->netdev_ops; |
7198 | ||
4417da66 PM |
7199 | /* dev_open will call this function so the list will stay sane. */ |
7200 | if (!(dev->flags&IFF_UP)) | |
7201 | return; | |
7202 | ||
7203 | if (!netif_device_present(dev)) | |
40b77c94 | 7204 | return; |
4417da66 | 7205 | |
01789349 | 7206 | if (!(dev->priv_flags & IFF_UNICAST_FLT)) { |
4417da66 PM |
7207 | /* Unicast addresses changes may only happen under the rtnl, |
7208 | * therefore calling __dev_set_promiscuity here is safe. | |
7209 | */ | |
32e7bfc4 | 7210 | if (!netdev_uc_empty(dev) && !dev->uc_promisc) { |
991fb3f7 | 7211 | __dev_set_promiscuity(dev, 1, false); |
2d348d1f | 7212 | dev->uc_promisc = true; |
32e7bfc4 | 7213 | } else if (netdev_uc_empty(dev) && dev->uc_promisc) { |
991fb3f7 | 7214 | __dev_set_promiscuity(dev, -1, false); |
2d348d1f | 7215 | dev->uc_promisc = false; |
4417da66 | 7216 | } |
4417da66 | 7217 | } |
01789349 JP |
7218 | |
7219 | if (ops->ndo_set_rx_mode) | |
7220 | ops->ndo_set_rx_mode(dev); | |
4417da66 PM |
7221 | } |
7222 | ||
7223 | void dev_set_rx_mode(struct net_device *dev) | |
7224 | { | |
b9e40857 | 7225 | netif_addr_lock_bh(dev); |
4417da66 | 7226 | __dev_set_rx_mode(dev); |
b9e40857 | 7227 | netif_addr_unlock_bh(dev); |
1da177e4 LT |
7228 | } |
7229 | ||
f0db275a SH |
7230 | /** |
7231 | * dev_get_flags - get flags reported to userspace | |
7232 | * @dev: device | |
7233 | * | |
7234 | * Get the combination of flag bits exported through APIs to userspace. | |
7235 | */ | |
95c96174 | 7236 | unsigned int dev_get_flags(const struct net_device *dev) |
1da177e4 | 7237 | { |
95c96174 | 7238 | unsigned int flags; |
1da177e4 LT |
7239 | |
7240 | flags = (dev->flags & ~(IFF_PROMISC | | |
7241 | IFF_ALLMULTI | | |
b00055aa SR |
7242 | IFF_RUNNING | |
7243 | IFF_LOWER_UP | | |
7244 | IFF_DORMANT)) | | |
1da177e4 LT |
7245 | (dev->gflags & (IFF_PROMISC | |
7246 | IFF_ALLMULTI)); | |
7247 | ||
b00055aa SR |
7248 | if (netif_running(dev)) { |
7249 | if (netif_oper_up(dev)) | |
7250 | flags |= IFF_RUNNING; | |
7251 | if (netif_carrier_ok(dev)) | |
7252 | flags |= IFF_LOWER_UP; | |
7253 | if (netif_dormant(dev)) | |
7254 | flags |= IFF_DORMANT; | |
7255 | } | |
1da177e4 LT |
7256 | |
7257 | return flags; | |
7258 | } | |
d1b19dff | 7259 | EXPORT_SYMBOL(dev_get_flags); |
1da177e4 | 7260 | |
bd380811 | 7261 | int __dev_change_flags(struct net_device *dev, unsigned int flags) |
1da177e4 | 7262 | { |
b536db93 | 7263 | unsigned int old_flags = dev->flags; |
bd380811 | 7264 | int ret; |
1da177e4 | 7265 | |
24023451 PM |
7266 | ASSERT_RTNL(); |
7267 | ||
1da177e4 LT |
7268 | /* |
7269 | * Set the flags on our device. | |
7270 | */ | |
7271 | ||
7272 | dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP | | |
7273 | IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL | | |
7274 | IFF_AUTOMEDIA)) | | |
7275 | (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC | | |
7276 | IFF_ALLMULTI)); | |
7277 | ||
7278 | /* | |
7279 | * Load in the correct multicast list now the flags have changed. | |
7280 | */ | |
7281 | ||
b6c40d68 PM |
7282 | if ((old_flags ^ flags) & IFF_MULTICAST) |
7283 | dev_change_rx_flags(dev, IFF_MULTICAST); | |
24023451 | 7284 | |
4417da66 | 7285 | dev_set_rx_mode(dev); |
1da177e4 LT |
7286 | |
7287 | /* | |
7288 | * Have we downed the interface. We handle IFF_UP ourselves | |
7289 | * according to user attempts to set it, rather than blindly | |
7290 | * setting it. | |
7291 | */ | |
7292 | ||
7293 | ret = 0; | |
7051b88a | 7294 | if ((old_flags ^ flags) & IFF_UP) { |
7295 | if (old_flags & IFF_UP) | |
7296 | __dev_close(dev); | |
7297 | else | |
7298 | ret = __dev_open(dev); | |
7299 | } | |
1da177e4 | 7300 | |
1da177e4 | 7301 | if ((flags ^ dev->gflags) & IFF_PROMISC) { |
d1b19dff | 7302 | int inc = (flags & IFF_PROMISC) ? 1 : -1; |
991fb3f7 | 7303 | unsigned int old_flags = dev->flags; |
d1b19dff | 7304 | |
1da177e4 | 7305 | dev->gflags ^= IFF_PROMISC; |
991fb3f7 ND |
7306 | |
7307 | if (__dev_set_promiscuity(dev, inc, false) >= 0) | |
7308 | if (dev->flags != old_flags) | |
7309 | dev_set_rx_mode(dev); | |
1da177e4 LT |
7310 | } |
7311 | ||
7312 | /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI | |
eb13da1a | 7313 | * is important. Some (broken) drivers set IFF_PROMISC, when |
7314 | * IFF_ALLMULTI is requested not asking us and not reporting. | |
1da177e4 LT |
7315 | */ |
7316 | if ((flags ^ dev->gflags) & IFF_ALLMULTI) { | |
d1b19dff ED |
7317 | int inc = (flags & IFF_ALLMULTI) ? 1 : -1; |
7318 | ||
1da177e4 | 7319 | dev->gflags ^= IFF_ALLMULTI; |
991fb3f7 | 7320 | __dev_set_allmulti(dev, inc, false); |
1da177e4 LT |
7321 | } |
7322 | ||
bd380811 PM |
7323 | return ret; |
7324 | } | |
7325 | ||
a528c219 ND |
7326 | void __dev_notify_flags(struct net_device *dev, unsigned int old_flags, |
7327 | unsigned int gchanges) | |
bd380811 PM |
7328 | { |
7329 | unsigned int changes = dev->flags ^ old_flags; | |
7330 | ||
a528c219 | 7331 | if (gchanges) |
7f294054 | 7332 | rtmsg_ifinfo(RTM_NEWLINK, dev, gchanges, GFP_ATOMIC); |
a528c219 | 7333 | |
bd380811 PM |
7334 | if (changes & IFF_UP) { |
7335 | if (dev->flags & IFF_UP) | |
7336 | call_netdevice_notifiers(NETDEV_UP, dev); | |
7337 | else | |
7338 | call_netdevice_notifiers(NETDEV_DOWN, dev); | |
7339 | } | |
7340 | ||
7341 | if (dev->flags & IFF_UP && | |
be9efd36 | 7342 | (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE))) { |
51d0c047 DA |
7343 | struct netdev_notifier_change_info change_info = { |
7344 | .info = { | |
7345 | .dev = dev, | |
7346 | }, | |
7347 | .flags_changed = changes, | |
7348 | }; | |
be9efd36 | 7349 | |
51d0c047 | 7350 | call_netdevice_notifiers_info(NETDEV_CHANGE, &change_info.info); |
be9efd36 | 7351 | } |
bd380811 PM |
7352 | } |
7353 | ||
7354 | /** | |
7355 | * dev_change_flags - change device settings | |
7356 | * @dev: device | |
7357 | * @flags: device state flags | |
7358 | * | |
7359 | * Change settings on device based state flags. The flags are | |
7360 | * in the userspace exported format. | |
7361 | */ | |
b536db93 | 7362 | int dev_change_flags(struct net_device *dev, unsigned int flags) |
bd380811 | 7363 | { |
b536db93 | 7364 | int ret; |
991fb3f7 | 7365 | unsigned int changes, old_flags = dev->flags, old_gflags = dev->gflags; |
bd380811 PM |
7366 | |
7367 | ret = __dev_change_flags(dev, flags); | |
7368 | if (ret < 0) | |
7369 | return ret; | |
7370 | ||
991fb3f7 | 7371 | changes = (old_flags ^ dev->flags) | (old_gflags ^ dev->gflags); |
a528c219 | 7372 | __dev_notify_flags(dev, old_flags, changes); |
1da177e4 LT |
7373 | return ret; |
7374 | } | |
d1b19dff | 7375 | EXPORT_SYMBOL(dev_change_flags); |
1da177e4 | 7376 | |
f51048c3 | 7377 | int __dev_set_mtu(struct net_device *dev, int new_mtu) |
2315dc91 VF |
7378 | { |
7379 | const struct net_device_ops *ops = dev->netdev_ops; | |
7380 | ||
7381 | if (ops->ndo_change_mtu) | |
7382 | return ops->ndo_change_mtu(dev, new_mtu); | |
7383 | ||
7384 | dev->mtu = new_mtu; | |
7385 | return 0; | |
7386 | } | |
f51048c3 | 7387 | EXPORT_SYMBOL(__dev_set_mtu); |
2315dc91 | 7388 | |
f0db275a SH |
7389 | /** |
7390 | * dev_set_mtu - Change maximum transfer unit | |
7391 | * @dev: device | |
7392 | * @new_mtu: new transfer unit | |
7393 | * | |
7394 | * Change the maximum transfer size of the network device. | |
7395 | */ | |
1da177e4 LT |
7396 | int dev_set_mtu(struct net_device *dev, int new_mtu) |
7397 | { | |
2315dc91 | 7398 | int err, orig_mtu; |
1da177e4 LT |
7399 | |
7400 | if (new_mtu == dev->mtu) | |
7401 | return 0; | |
7402 | ||
61e84623 JW |
7403 | /* MTU must be positive, and in range */ |
7404 | if (new_mtu < 0 || new_mtu < dev->min_mtu) { | |
7405 | net_err_ratelimited("%s: Invalid MTU %d requested, hw min %d\n", | |
7406 | dev->name, new_mtu, dev->min_mtu); | |
1da177e4 | 7407 | return -EINVAL; |
61e84623 JW |
7408 | } |
7409 | ||
7410 | if (dev->max_mtu > 0 && new_mtu > dev->max_mtu) { | |
7411 | net_err_ratelimited("%s: Invalid MTU %d requested, hw max %d\n", | |
a0e65de7 | 7412 | dev->name, new_mtu, dev->max_mtu); |
61e84623 JW |
7413 | return -EINVAL; |
7414 | } | |
1da177e4 LT |
7415 | |
7416 | if (!netif_device_present(dev)) | |
7417 | return -ENODEV; | |
7418 | ||
1d486bfb VF |
7419 | err = call_netdevice_notifiers(NETDEV_PRECHANGEMTU, dev); |
7420 | err = notifier_to_errno(err); | |
7421 | if (err) | |
7422 | return err; | |
d314774c | 7423 | |
2315dc91 VF |
7424 | orig_mtu = dev->mtu; |
7425 | err = __dev_set_mtu(dev, new_mtu); | |
d314774c | 7426 | |
2315dc91 VF |
7427 | if (!err) { |
7428 | err = call_netdevice_notifiers(NETDEV_CHANGEMTU, dev); | |
7429 | err = notifier_to_errno(err); | |
7430 | if (err) { | |
7431 | /* setting mtu back and notifying everyone again, | |
7432 | * so that they have a chance to revert changes. | |
7433 | */ | |
7434 | __dev_set_mtu(dev, orig_mtu); | |
7435 | call_netdevice_notifiers(NETDEV_CHANGEMTU, dev); | |
7436 | } | |
7437 | } | |
1da177e4 LT |
7438 | return err; |
7439 | } | |
d1b19dff | 7440 | EXPORT_SYMBOL(dev_set_mtu); |
1da177e4 | 7441 | |
6a643ddb CW |
7442 | /** |
7443 | * dev_change_tx_queue_len - Change TX queue length of a netdevice | |
7444 | * @dev: device | |
7445 | * @new_len: new tx queue length | |
7446 | */ | |
7447 | int dev_change_tx_queue_len(struct net_device *dev, unsigned long new_len) | |
7448 | { | |
7449 | unsigned int orig_len = dev->tx_queue_len; | |
7450 | int res; | |
7451 | ||
7452 | if (new_len != (unsigned int)new_len) | |
7453 | return -ERANGE; | |
7454 | ||
7455 | if (new_len != orig_len) { | |
7456 | dev->tx_queue_len = new_len; | |
7457 | res = call_netdevice_notifiers(NETDEV_CHANGE_TX_QUEUE_LEN, dev); | |
7458 | res = notifier_to_errno(res); | |
7459 | if (res) { | |
7460 | netdev_err(dev, | |
7461 | "refused to change device tx_queue_len\n"); | |
7462 | dev->tx_queue_len = orig_len; | |
7463 | return res; | |
7464 | } | |
48bfd55e | 7465 | return dev_qdisc_change_tx_queue_len(dev); |
6a643ddb CW |
7466 | } |
7467 | ||
7468 | return 0; | |
7469 | } | |
7470 | ||
cbda10fa VD |
7471 | /** |
7472 | * dev_set_group - Change group this device belongs to | |
7473 | * @dev: device | |
7474 | * @new_group: group this device should belong to | |
7475 | */ | |
7476 | void dev_set_group(struct net_device *dev, int new_group) | |
7477 | { | |
7478 | dev->group = new_group; | |
7479 | } | |
7480 | EXPORT_SYMBOL(dev_set_group); | |
7481 | ||
f0db275a SH |
7482 | /** |
7483 | * dev_set_mac_address - Change Media Access Control Address | |
7484 | * @dev: device | |
7485 | * @sa: new address | |
7486 | * | |
7487 | * Change the hardware (MAC) address of the device | |
7488 | */ | |
1da177e4 LT |
7489 | int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa) |
7490 | { | |
d314774c | 7491 | const struct net_device_ops *ops = dev->netdev_ops; |
1da177e4 LT |
7492 | int err; |
7493 | ||
d314774c | 7494 | if (!ops->ndo_set_mac_address) |
1da177e4 LT |
7495 | return -EOPNOTSUPP; |
7496 | if (sa->sa_family != dev->type) | |
7497 | return -EINVAL; | |
7498 | if (!netif_device_present(dev)) | |
7499 | return -ENODEV; | |
d314774c | 7500 | err = ops->ndo_set_mac_address(dev, sa); |
f6521516 JP |
7501 | if (err) |
7502 | return err; | |
fbdeca2d | 7503 | dev->addr_assign_type = NET_ADDR_SET; |
f6521516 | 7504 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); |
7bf23575 | 7505 | add_device_randomness(dev->dev_addr, dev->addr_len); |
f6521516 | 7506 | return 0; |
1da177e4 | 7507 | } |
d1b19dff | 7508 | EXPORT_SYMBOL(dev_set_mac_address); |
1da177e4 | 7509 | |
4bf84c35 JP |
7510 | /** |
7511 | * dev_change_carrier - Change device carrier | |
7512 | * @dev: device | |
691b3b7e | 7513 | * @new_carrier: new value |
4bf84c35 JP |
7514 | * |
7515 | * Change device carrier | |
7516 | */ | |
7517 | int dev_change_carrier(struct net_device *dev, bool new_carrier) | |
7518 | { | |
7519 | const struct net_device_ops *ops = dev->netdev_ops; | |
7520 | ||
7521 | if (!ops->ndo_change_carrier) | |
7522 | return -EOPNOTSUPP; | |
7523 | if (!netif_device_present(dev)) | |
7524 | return -ENODEV; | |
7525 | return ops->ndo_change_carrier(dev, new_carrier); | |
7526 | } | |
7527 | EXPORT_SYMBOL(dev_change_carrier); | |
7528 | ||
66b52b0d JP |
7529 | /** |
7530 | * dev_get_phys_port_id - Get device physical port ID | |
7531 | * @dev: device | |
7532 | * @ppid: port ID | |
7533 | * | |
7534 | * Get device physical port ID | |
7535 | */ | |
7536 | int dev_get_phys_port_id(struct net_device *dev, | |
02637fce | 7537 | struct netdev_phys_item_id *ppid) |
66b52b0d JP |
7538 | { |
7539 | const struct net_device_ops *ops = dev->netdev_ops; | |
7540 | ||
7541 | if (!ops->ndo_get_phys_port_id) | |
7542 | return -EOPNOTSUPP; | |
7543 | return ops->ndo_get_phys_port_id(dev, ppid); | |
7544 | } | |
7545 | EXPORT_SYMBOL(dev_get_phys_port_id); | |
7546 | ||
db24a904 DA |
7547 | /** |
7548 | * dev_get_phys_port_name - Get device physical port name | |
7549 | * @dev: device | |
7550 | * @name: port name | |
ed49e650 | 7551 | * @len: limit of bytes to copy to name |
db24a904 DA |
7552 | * |
7553 | * Get device physical port name | |
7554 | */ | |
7555 | int dev_get_phys_port_name(struct net_device *dev, | |
7556 | char *name, size_t len) | |
7557 | { | |
7558 | const struct net_device_ops *ops = dev->netdev_ops; | |
7559 | ||
7560 | if (!ops->ndo_get_phys_port_name) | |
7561 | return -EOPNOTSUPP; | |
7562 | return ops->ndo_get_phys_port_name(dev, name, len); | |
7563 | } | |
7564 | EXPORT_SYMBOL(dev_get_phys_port_name); | |
7565 | ||
d746d707 AK |
7566 | /** |
7567 | * dev_change_proto_down - update protocol port state information | |
7568 | * @dev: device | |
7569 | * @proto_down: new value | |
7570 | * | |
7571 | * This info can be used by switch drivers to set the phys state of the | |
7572 | * port. | |
7573 | */ | |
7574 | int dev_change_proto_down(struct net_device *dev, bool proto_down) | |
7575 | { | |
7576 | const struct net_device_ops *ops = dev->netdev_ops; | |
7577 | ||
7578 | if (!ops->ndo_change_proto_down) | |
7579 | return -EOPNOTSUPP; | |
7580 | if (!netif_device_present(dev)) | |
7581 | return -ENODEV; | |
7582 | return ops->ndo_change_proto_down(dev, proto_down); | |
7583 | } | |
7584 | EXPORT_SYMBOL(dev_change_proto_down); | |
7585 | ||
118b4aa2 JK |
7586 | void __dev_xdp_query(struct net_device *dev, bpf_op_t bpf_op, |
7587 | struct netdev_bpf *xdp) | |
d67b9cd2 | 7588 | { |
118b4aa2 JK |
7589 | memset(xdp, 0, sizeof(*xdp)); |
7590 | xdp->command = XDP_QUERY_PROG; | |
d67b9cd2 DB |
7591 | |
7592 | /* Query must always succeed. */ | |
118b4aa2 JK |
7593 | WARN_ON(bpf_op(dev, xdp) < 0); |
7594 | } | |
7595 | ||
7596 | static u8 __dev_xdp_attached(struct net_device *dev, bpf_op_t bpf_op) | |
7597 | { | |
7598 | struct netdev_bpf xdp; | |
7599 | ||
7600 | __dev_xdp_query(dev, bpf_op, &xdp); | |
58038695 | 7601 | |
d67b9cd2 DB |
7602 | return xdp.prog_attached; |
7603 | } | |
7604 | ||
f4e63525 | 7605 | static int dev_xdp_install(struct net_device *dev, bpf_op_t bpf_op, |
32d60277 | 7606 | struct netlink_ext_ack *extack, u32 flags, |
d67b9cd2 DB |
7607 | struct bpf_prog *prog) |
7608 | { | |
f4e63525 | 7609 | struct netdev_bpf xdp; |
d67b9cd2 DB |
7610 | |
7611 | memset(&xdp, 0, sizeof(xdp)); | |
ee5d032f JK |
7612 | if (flags & XDP_FLAGS_HW_MODE) |
7613 | xdp.command = XDP_SETUP_PROG_HW; | |
7614 | else | |
7615 | xdp.command = XDP_SETUP_PROG; | |
d67b9cd2 | 7616 | xdp.extack = extack; |
32d60277 | 7617 | xdp.flags = flags; |
d67b9cd2 DB |
7618 | xdp.prog = prog; |
7619 | ||
f4e63525 | 7620 | return bpf_op(dev, &xdp); |
d67b9cd2 DB |
7621 | } |
7622 | ||
bd0b2e7f JK |
7623 | static void dev_xdp_uninstall(struct net_device *dev) |
7624 | { | |
7625 | struct netdev_bpf xdp; | |
7626 | bpf_op_t ndo_bpf; | |
7627 | ||
7628 | /* Remove generic XDP */ | |
7629 | WARN_ON(dev_xdp_install(dev, generic_xdp_install, NULL, 0, NULL)); | |
7630 | ||
7631 | /* Remove from the driver */ | |
7632 | ndo_bpf = dev->netdev_ops->ndo_bpf; | |
7633 | if (!ndo_bpf) | |
7634 | return; | |
7635 | ||
7636 | __dev_xdp_query(dev, ndo_bpf, &xdp); | |
7637 | if (xdp.prog_attached == XDP_ATTACHED_NONE) | |
7638 | return; | |
7639 | ||
7640 | /* Program removal should always succeed */ | |
7641 | WARN_ON(dev_xdp_install(dev, ndo_bpf, NULL, xdp.prog_flags, NULL)); | |
7642 | } | |
7643 | ||
a7862b45 BB |
7644 | /** |
7645 | * dev_change_xdp_fd - set or clear a bpf program for a device rx path | |
7646 | * @dev: device | |
b5d60989 | 7647 | * @extack: netlink extended ack |
a7862b45 | 7648 | * @fd: new program fd or negative value to clear |
85de8576 | 7649 | * @flags: xdp-related flags |
a7862b45 BB |
7650 | * |
7651 | * Set or clear a bpf program for a device | |
7652 | */ | |
ddf9f970 JK |
7653 | int dev_change_xdp_fd(struct net_device *dev, struct netlink_ext_ack *extack, |
7654 | int fd, u32 flags) | |
a7862b45 BB |
7655 | { |
7656 | const struct net_device_ops *ops = dev->netdev_ops; | |
7657 | struct bpf_prog *prog = NULL; | |
f4e63525 | 7658 | bpf_op_t bpf_op, bpf_chk; |
a7862b45 BB |
7659 | int err; |
7660 | ||
85de8576 DB |
7661 | ASSERT_RTNL(); |
7662 | ||
f4e63525 JK |
7663 | bpf_op = bpf_chk = ops->ndo_bpf; |
7664 | if (!bpf_op && (flags & (XDP_FLAGS_DRV_MODE | XDP_FLAGS_HW_MODE))) | |
0489df9a | 7665 | return -EOPNOTSUPP; |
f4e63525 JK |
7666 | if (!bpf_op || (flags & XDP_FLAGS_SKB_MODE)) |
7667 | bpf_op = generic_xdp_install; | |
7668 | if (bpf_op == bpf_chk) | |
7669 | bpf_chk = generic_xdp_install; | |
b5cdae32 | 7670 | |
a7862b45 | 7671 | if (fd >= 0) { |
118b4aa2 | 7672 | if (bpf_chk && __dev_xdp_attached(dev, bpf_chk)) |
d67b9cd2 DB |
7673 | return -EEXIST; |
7674 | if ((flags & XDP_FLAGS_UPDATE_IF_NOEXIST) && | |
118b4aa2 | 7675 | __dev_xdp_attached(dev, bpf_op)) |
d67b9cd2 | 7676 | return -EBUSY; |
85de8576 | 7677 | |
288b3de5 JK |
7678 | prog = bpf_prog_get_type_dev(fd, BPF_PROG_TYPE_XDP, |
7679 | bpf_op == ops->ndo_bpf); | |
a7862b45 BB |
7680 | if (IS_ERR(prog)) |
7681 | return PTR_ERR(prog); | |
441a3303 JK |
7682 | |
7683 | if (!(flags & XDP_FLAGS_HW_MODE) && | |
7684 | bpf_prog_is_dev_bound(prog->aux)) { | |
7685 | NL_SET_ERR_MSG(extack, "using device-bound program without HW_MODE flag is not supported"); | |
7686 | bpf_prog_put(prog); | |
7687 | return -EINVAL; | |
7688 | } | |
a7862b45 BB |
7689 | } |
7690 | ||
f4e63525 | 7691 | err = dev_xdp_install(dev, bpf_op, extack, flags, prog); |
a7862b45 BB |
7692 | if (err < 0 && prog) |
7693 | bpf_prog_put(prog); | |
7694 | ||
7695 | return err; | |
7696 | } | |
a7862b45 | 7697 | |
1da177e4 LT |
7698 | /** |
7699 | * dev_new_index - allocate an ifindex | |
c4ea43c5 | 7700 | * @net: the applicable net namespace |
1da177e4 LT |
7701 | * |
7702 | * Returns a suitable unique value for a new device interface | |
7703 | * number. The caller must hold the rtnl semaphore or the | |
7704 | * dev_base_lock to be sure it remains unique. | |
7705 | */ | |
881d966b | 7706 | static int dev_new_index(struct net *net) |
1da177e4 | 7707 | { |
aa79e66e | 7708 | int ifindex = net->ifindex; |
f4563a75 | 7709 | |
1da177e4 LT |
7710 | for (;;) { |
7711 | if (++ifindex <= 0) | |
7712 | ifindex = 1; | |
881d966b | 7713 | if (!__dev_get_by_index(net, ifindex)) |
aa79e66e | 7714 | return net->ifindex = ifindex; |
1da177e4 LT |
7715 | } |
7716 | } | |
7717 | ||
1da177e4 | 7718 | /* Delayed registration/unregisteration */ |
3b5b34fd | 7719 | static LIST_HEAD(net_todo_list); |
200b916f | 7720 | DECLARE_WAIT_QUEUE_HEAD(netdev_unregistering_wq); |
1da177e4 | 7721 | |
6f05f629 | 7722 | static void net_set_todo(struct net_device *dev) |
1da177e4 | 7723 | { |
1da177e4 | 7724 | list_add_tail(&dev->todo_list, &net_todo_list); |
50624c93 | 7725 | dev_net(dev)->dev_unreg_count++; |
1da177e4 LT |
7726 | } |
7727 | ||
9b5e383c | 7728 | static void rollback_registered_many(struct list_head *head) |
93ee31f1 | 7729 | { |
e93737b0 | 7730 | struct net_device *dev, *tmp; |
5cde2829 | 7731 | LIST_HEAD(close_head); |
9b5e383c | 7732 | |
93ee31f1 DL |
7733 | BUG_ON(dev_boot_phase); |
7734 | ASSERT_RTNL(); | |
7735 | ||
e93737b0 | 7736 | list_for_each_entry_safe(dev, tmp, head, unreg_list) { |
9b5e383c | 7737 | /* Some devices call without registering |
e93737b0 KK |
7738 | * for initialization unwind. Remove those |
7739 | * devices and proceed with the remaining. | |
9b5e383c ED |
7740 | */ |
7741 | if (dev->reg_state == NETREG_UNINITIALIZED) { | |
7b6cd1ce JP |
7742 | pr_debug("unregister_netdevice: device %s/%p never was registered\n", |
7743 | dev->name, dev); | |
93ee31f1 | 7744 | |
9b5e383c | 7745 | WARN_ON(1); |
e93737b0 KK |
7746 | list_del(&dev->unreg_list); |
7747 | continue; | |
9b5e383c | 7748 | } |
449f4544 | 7749 | dev->dismantle = true; |
9b5e383c | 7750 | BUG_ON(dev->reg_state != NETREG_REGISTERED); |
44345724 | 7751 | } |
93ee31f1 | 7752 | |
44345724 | 7753 | /* If device is running, close it first. */ |
5cde2829 EB |
7754 | list_for_each_entry(dev, head, unreg_list) |
7755 | list_add_tail(&dev->close_list, &close_head); | |
99c4a26a | 7756 | dev_close_many(&close_head, true); |
93ee31f1 | 7757 | |
44345724 | 7758 | list_for_each_entry(dev, head, unreg_list) { |
9b5e383c ED |
7759 | /* And unlink it from device chain. */ |
7760 | unlist_netdevice(dev); | |
93ee31f1 | 7761 | |
9b5e383c ED |
7762 | dev->reg_state = NETREG_UNREGISTERING; |
7763 | } | |
41852497 | 7764 | flush_all_backlogs(); |
93ee31f1 DL |
7765 | |
7766 | synchronize_net(); | |
7767 | ||
9b5e383c | 7768 | list_for_each_entry(dev, head, unreg_list) { |
395eea6c MB |
7769 | struct sk_buff *skb = NULL; |
7770 | ||
9b5e383c ED |
7771 | /* Shutdown queueing discipline. */ |
7772 | dev_shutdown(dev); | |
93ee31f1 | 7773 | |
bd0b2e7f | 7774 | dev_xdp_uninstall(dev); |
93ee31f1 | 7775 | |
9b5e383c | 7776 | /* Notify protocols, that we are about to destroy |
eb13da1a | 7777 | * this device. They should clean all the things. |
7778 | */ | |
9b5e383c | 7779 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); |
93ee31f1 | 7780 | |
395eea6c MB |
7781 | if (!dev->rtnl_link_ops || |
7782 | dev->rtnl_link_state == RTNL_LINK_INITIALIZED) | |
3d3ea5af | 7783 | skb = rtmsg_ifinfo_build_skb(RTM_DELLINK, dev, ~0U, 0, |
38e01b30 | 7784 | GFP_KERNEL, NULL, 0); |
395eea6c | 7785 | |
9b5e383c ED |
7786 | /* |
7787 | * Flush the unicast and multicast chains | |
7788 | */ | |
a748ee24 | 7789 | dev_uc_flush(dev); |
22bedad3 | 7790 | dev_mc_flush(dev); |
93ee31f1 | 7791 | |
9b5e383c ED |
7792 | if (dev->netdev_ops->ndo_uninit) |
7793 | dev->netdev_ops->ndo_uninit(dev); | |
93ee31f1 | 7794 | |
395eea6c MB |
7795 | if (skb) |
7796 | rtmsg_ifinfo_send(skb, dev, GFP_KERNEL); | |
56bfa7ee | 7797 | |
9ff162a8 JP |
7798 | /* Notifier chain MUST detach us all upper devices. */ |
7799 | WARN_ON(netdev_has_any_upper_dev(dev)); | |
0f524a80 | 7800 | WARN_ON(netdev_has_any_lower_dev(dev)); |
93ee31f1 | 7801 | |
9b5e383c ED |
7802 | /* Remove entries from kobject tree */ |
7803 | netdev_unregister_kobject(dev); | |
024e9679 AD |
7804 | #ifdef CONFIG_XPS |
7805 | /* Remove XPS queueing entries */ | |
7806 | netif_reset_xps_queues_gt(dev, 0); | |
7807 | #endif | |
9b5e383c | 7808 | } |
93ee31f1 | 7809 | |
850a545b | 7810 | synchronize_net(); |
395264d5 | 7811 | |
a5ee1551 | 7812 | list_for_each_entry(dev, head, unreg_list) |
9b5e383c ED |
7813 | dev_put(dev); |
7814 | } | |
7815 | ||
7816 | static void rollback_registered(struct net_device *dev) | |
7817 | { | |
7818 | LIST_HEAD(single); | |
7819 | ||
7820 | list_add(&dev->unreg_list, &single); | |
7821 | rollback_registered_many(&single); | |
ceaaec98 | 7822 | list_del(&single); |
93ee31f1 DL |
7823 | } |
7824 | ||
fd867d51 JW |
7825 | static netdev_features_t netdev_sync_upper_features(struct net_device *lower, |
7826 | struct net_device *upper, netdev_features_t features) | |
7827 | { | |
7828 | netdev_features_t upper_disables = NETIF_F_UPPER_DISABLES; | |
7829 | netdev_features_t feature; | |
5ba3f7d6 | 7830 | int feature_bit; |
fd867d51 | 7831 | |
5ba3f7d6 JW |
7832 | for_each_netdev_feature(&upper_disables, feature_bit) { |
7833 | feature = __NETIF_F_BIT(feature_bit); | |
fd867d51 JW |
7834 | if (!(upper->wanted_features & feature) |
7835 | && (features & feature)) { | |
7836 | netdev_dbg(lower, "Dropping feature %pNF, upper dev %s has it off.\n", | |
7837 | &feature, upper->name); | |
7838 | features &= ~feature; | |
7839 | } | |
7840 | } | |
7841 | ||
7842 | return features; | |
7843 | } | |
7844 | ||
7845 | static void netdev_sync_lower_features(struct net_device *upper, | |
7846 | struct net_device *lower, netdev_features_t features) | |
7847 | { | |
7848 | netdev_features_t upper_disables = NETIF_F_UPPER_DISABLES; | |
7849 | netdev_features_t feature; | |
5ba3f7d6 | 7850 | int feature_bit; |
fd867d51 | 7851 | |
5ba3f7d6 JW |
7852 | for_each_netdev_feature(&upper_disables, feature_bit) { |
7853 | feature = __NETIF_F_BIT(feature_bit); | |
fd867d51 JW |
7854 | if (!(features & feature) && (lower->features & feature)) { |
7855 | netdev_dbg(upper, "Disabling feature %pNF on lower dev %s.\n", | |
7856 | &feature, lower->name); | |
7857 | lower->wanted_features &= ~feature; | |
7858 | netdev_update_features(lower); | |
7859 | ||
7860 | if (unlikely(lower->features & feature)) | |
7861 | netdev_WARN(upper, "failed to disable %pNF on %s!\n", | |
7862 | &feature, lower->name); | |
7863 | } | |
7864 | } | |
7865 | } | |
7866 | ||
c8f44aff MM |
7867 | static netdev_features_t netdev_fix_features(struct net_device *dev, |
7868 | netdev_features_t features) | |
b63365a2 | 7869 | { |
57422dc5 MM |
7870 | /* Fix illegal checksum combinations */ |
7871 | if ((features & NETIF_F_HW_CSUM) && | |
7872 | (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) { | |
6f404e44 | 7873 | netdev_warn(dev, "mixed HW and IP checksum settings.\n"); |
57422dc5 MM |
7874 | features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM); |
7875 | } | |
7876 | ||
b63365a2 | 7877 | /* TSO requires that SG is present as well. */ |
ea2d3688 | 7878 | if ((features & NETIF_F_ALL_TSO) && !(features & NETIF_F_SG)) { |
6f404e44 | 7879 | netdev_dbg(dev, "Dropping TSO features since no SG feature.\n"); |
ea2d3688 | 7880 | features &= ~NETIF_F_ALL_TSO; |
b63365a2 HX |
7881 | } |
7882 | ||
ec5f0615 PS |
7883 | if ((features & NETIF_F_TSO) && !(features & NETIF_F_HW_CSUM) && |
7884 | !(features & NETIF_F_IP_CSUM)) { | |
7885 | netdev_dbg(dev, "Dropping TSO features since no CSUM feature.\n"); | |
7886 | features &= ~NETIF_F_TSO; | |
7887 | features &= ~NETIF_F_TSO_ECN; | |
7888 | } | |
7889 | ||
7890 | if ((features & NETIF_F_TSO6) && !(features & NETIF_F_HW_CSUM) && | |
7891 | !(features & NETIF_F_IPV6_CSUM)) { | |
7892 | netdev_dbg(dev, "Dropping TSO6 features since no CSUM feature.\n"); | |
7893 | features &= ~NETIF_F_TSO6; | |
7894 | } | |
7895 | ||
b1dc497b AD |
7896 | /* TSO with IPv4 ID mangling requires IPv4 TSO be enabled */ |
7897 | if ((features & NETIF_F_TSO_MANGLEID) && !(features & NETIF_F_TSO)) | |
7898 | features &= ~NETIF_F_TSO_MANGLEID; | |
7899 | ||
31d8b9e0 BH |
7900 | /* TSO ECN requires that TSO is present as well. */ |
7901 | if ((features & NETIF_F_ALL_TSO) == NETIF_F_TSO_ECN) | |
7902 | features &= ~NETIF_F_TSO_ECN; | |
7903 | ||
212b573f MM |
7904 | /* Software GSO depends on SG. */ |
7905 | if ((features & NETIF_F_GSO) && !(features & NETIF_F_SG)) { | |
6f404e44 | 7906 | netdev_dbg(dev, "Dropping NETIF_F_GSO since no SG feature.\n"); |
212b573f MM |
7907 | features &= ~NETIF_F_GSO; |
7908 | } | |
7909 | ||
802ab55a AD |
7910 | /* GSO partial features require GSO partial be set */ |
7911 | if ((features & dev->gso_partial_features) && | |
7912 | !(features & NETIF_F_GSO_PARTIAL)) { | |
7913 | netdev_dbg(dev, | |
7914 | "Dropping partially supported GSO features since no GSO partial.\n"); | |
7915 | features &= ~dev->gso_partial_features; | |
7916 | } | |
7917 | ||
fb1f5f79 MC |
7918 | if (!(features & NETIF_F_RXCSUM)) { |
7919 | /* NETIF_F_GRO_HW implies doing RXCSUM since every packet | |
7920 | * successfully merged by hardware must also have the | |
7921 | * checksum verified by hardware. If the user does not | |
7922 | * want to enable RXCSUM, logically, we should disable GRO_HW. | |
7923 | */ | |
7924 | if (features & NETIF_F_GRO_HW) { | |
7925 | netdev_dbg(dev, "Dropping NETIF_F_GRO_HW since no RXCSUM feature.\n"); | |
7926 | features &= ~NETIF_F_GRO_HW; | |
7927 | } | |
7928 | } | |
7929 | ||
de8d5ab2 GP |
7930 | /* LRO/HW-GRO features cannot be combined with RX-FCS */ |
7931 | if (features & NETIF_F_RXFCS) { | |
7932 | if (features & NETIF_F_LRO) { | |
7933 | netdev_dbg(dev, "Dropping LRO feature since RX-FCS is requested.\n"); | |
7934 | features &= ~NETIF_F_LRO; | |
7935 | } | |
7936 | ||
7937 | if (features & NETIF_F_GRO_HW) { | |
7938 | netdev_dbg(dev, "Dropping HW-GRO feature since RX-FCS is requested.\n"); | |
7939 | features &= ~NETIF_F_GRO_HW; | |
7940 | } | |
e6c6a929 GP |
7941 | } |
7942 | ||
b63365a2 HX |
7943 | return features; |
7944 | } | |
b63365a2 | 7945 | |
6cb6a27c | 7946 | int __netdev_update_features(struct net_device *dev) |
5455c699 | 7947 | { |
fd867d51 | 7948 | struct net_device *upper, *lower; |
c8f44aff | 7949 | netdev_features_t features; |
fd867d51 | 7950 | struct list_head *iter; |
e7868a85 | 7951 | int err = -1; |
5455c699 | 7952 | |
87267485 MM |
7953 | ASSERT_RTNL(); |
7954 | ||
5455c699 MM |
7955 | features = netdev_get_wanted_features(dev); |
7956 | ||
7957 | if (dev->netdev_ops->ndo_fix_features) | |
7958 | features = dev->netdev_ops->ndo_fix_features(dev, features); | |
7959 | ||
7960 | /* driver might be less strict about feature dependencies */ | |
7961 | features = netdev_fix_features(dev, features); | |
7962 | ||
fd867d51 JW |
7963 | /* some features can't be enabled if they're off an an upper device */ |
7964 | netdev_for_each_upper_dev_rcu(dev, upper, iter) | |
7965 | features = netdev_sync_upper_features(dev, upper, features); | |
7966 | ||
5455c699 | 7967 | if (dev->features == features) |
e7868a85 | 7968 | goto sync_lower; |
5455c699 | 7969 | |
c8f44aff MM |
7970 | netdev_dbg(dev, "Features changed: %pNF -> %pNF\n", |
7971 | &dev->features, &features); | |
5455c699 MM |
7972 | |
7973 | if (dev->netdev_ops->ndo_set_features) | |
7974 | err = dev->netdev_ops->ndo_set_features(dev, features); | |
5f8dc33e NA |
7975 | else |
7976 | err = 0; | |
5455c699 | 7977 | |
6cb6a27c | 7978 | if (unlikely(err < 0)) { |
5455c699 | 7979 | netdev_err(dev, |
c8f44aff MM |
7980 | "set_features() failed (%d); wanted %pNF, left %pNF\n", |
7981 | err, &features, &dev->features); | |
17b85d29 NA |
7982 | /* return non-0 since some features might have changed and |
7983 | * it's better to fire a spurious notification than miss it | |
7984 | */ | |
7985 | return -1; | |
6cb6a27c MM |
7986 | } |
7987 | ||
e7868a85 | 7988 | sync_lower: |
fd867d51 JW |
7989 | /* some features must be disabled on lower devices when disabled |
7990 | * on an upper device (think: bonding master or bridge) | |
7991 | */ | |
7992 | netdev_for_each_lower_dev(dev, lower, iter) | |
7993 | netdev_sync_lower_features(dev, lower, features); | |
7994 | ||
ae847f40 SD |
7995 | if (!err) { |
7996 | netdev_features_t diff = features ^ dev->features; | |
7997 | ||
7998 | if (diff & NETIF_F_RX_UDP_TUNNEL_PORT) { | |
7999 | /* udp_tunnel_{get,drop}_rx_info both need | |
8000 | * NETIF_F_RX_UDP_TUNNEL_PORT enabled on the | |
8001 | * device, or they won't do anything. | |
8002 | * Thus we need to update dev->features | |
8003 | * *before* calling udp_tunnel_get_rx_info, | |
8004 | * but *after* calling udp_tunnel_drop_rx_info. | |
8005 | */ | |
8006 | if (features & NETIF_F_RX_UDP_TUNNEL_PORT) { | |
8007 | dev->features = features; | |
8008 | udp_tunnel_get_rx_info(dev); | |
8009 | } else { | |
8010 | udp_tunnel_drop_rx_info(dev); | |
8011 | } | |
8012 | } | |
8013 | ||
9daae9bd GP |
8014 | if (diff & NETIF_F_HW_VLAN_CTAG_FILTER) { |
8015 | if (features & NETIF_F_HW_VLAN_CTAG_FILTER) { | |
8016 | dev->features = features; | |
8017 | err |= vlan_get_rx_ctag_filter_info(dev); | |
8018 | } else { | |
8019 | vlan_drop_rx_ctag_filter_info(dev); | |
8020 | } | |
8021 | } | |
8022 | ||
8023 | if (diff & NETIF_F_HW_VLAN_STAG_FILTER) { | |
8024 | if (features & NETIF_F_HW_VLAN_STAG_FILTER) { | |
8025 | dev->features = features; | |
8026 | err |= vlan_get_rx_stag_filter_info(dev); | |
8027 | } else { | |
8028 | vlan_drop_rx_stag_filter_info(dev); | |
8029 | } | |
8030 | } | |
8031 | ||
6cb6a27c | 8032 | dev->features = features; |
ae847f40 | 8033 | } |
6cb6a27c | 8034 | |
e7868a85 | 8035 | return err < 0 ? 0 : 1; |
6cb6a27c MM |
8036 | } |
8037 | ||
afe12cc8 MM |
8038 | /** |
8039 | * netdev_update_features - recalculate device features | |
8040 | * @dev: the device to check | |
8041 | * | |
8042 | * Recalculate dev->features set and send notifications if it | |
8043 | * has changed. Should be called after driver or hardware dependent | |
8044 | * conditions might have changed that influence the features. | |
8045 | */ | |
6cb6a27c MM |
8046 | void netdev_update_features(struct net_device *dev) |
8047 | { | |
8048 | if (__netdev_update_features(dev)) | |
8049 | netdev_features_change(dev); | |
5455c699 MM |
8050 | } |
8051 | EXPORT_SYMBOL(netdev_update_features); | |
8052 | ||
afe12cc8 MM |
8053 | /** |
8054 | * netdev_change_features - recalculate device features | |
8055 | * @dev: the device to check | |
8056 | * | |
8057 | * Recalculate dev->features set and send notifications even | |
8058 | * if they have not changed. Should be called instead of | |
8059 | * netdev_update_features() if also dev->vlan_features might | |
8060 | * have changed to allow the changes to be propagated to stacked | |
8061 | * VLAN devices. | |
8062 | */ | |
8063 | void netdev_change_features(struct net_device *dev) | |
8064 | { | |
8065 | __netdev_update_features(dev); | |
8066 | netdev_features_change(dev); | |
8067 | } | |
8068 | EXPORT_SYMBOL(netdev_change_features); | |
8069 | ||
fc4a7489 PM |
8070 | /** |
8071 | * netif_stacked_transfer_operstate - transfer operstate | |
8072 | * @rootdev: the root or lower level device to transfer state from | |
8073 | * @dev: the device to transfer operstate to | |
8074 | * | |
8075 | * Transfer operational state from root to device. This is normally | |
8076 | * called when a stacking relationship exists between the root | |
8077 | * device and the device(a leaf device). | |
8078 | */ | |
8079 | void netif_stacked_transfer_operstate(const struct net_device *rootdev, | |
8080 | struct net_device *dev) | |
8081 | { | |
8082 | if (rootdev->operstate == IF_OPER_DORMANT) | |
8083 | netif_dormant_on(dev); | |
8084 | else | |
8085 | netif_dormant_off(dev); | |
8086 | ||
0575c86b ZS |
8087 | if (netif_carrier_ok(rootdev)) |
8088 | netif_carrier_on(dev); | |
8089 | else | |
8090 | netif_carrier_off(dev); | |
fc4a7489 PM |
8091 | } |
8092 | EXPORT_SYMBOL(netif_stacked_transfer_operstate); | |
8093 | ||
1b4bf461 ED |
8094 | static int netif_alloc_rx_queues(struct net_device *dev) |
8095 | { | |
1b4bf461 | 8096 | unsigned int i, count = dev->num_rx_queues; |
bd25fa7b | 8097 | struct netdev_rx_queue *rx; |
10595902 | 8098 | size_t sz = count * sizeof(*rx); |
e817f856 | 8099 | int err = 0; |
1b4bf461 | 8100 | |
bd25fa7b | 8101 | BUG_ON(count < 1); |
1b4bf461 | 8102 | |
dcda9b04 | 8103 | rx = kvzalloc(sz, GFP_KERNEL | __GFP_RETRY_MAYFAIL); |
da6bc57a MH |
8104 | if (!rx) |
8105 | return -ENOMEM; | |
8106 | ||
bd25fa7b TH |
8107 | dev->_rx = rx; |
8108 | ||
e817f856 | 8109 | for (i = 0; i < count; i++) { |
fe822240 | 8110 | rx[i].dev = dev; |
e817f856 JDB |
8111 | |
8112 | /* XDP RX-queue setup */ | |
8113 | err = xdp_rxq_info_reg(&rx[i].xdp_rxq, dev, i); | |
8114 | if (err < 0) | |
8115 | goto err_rxq_info; | |
8116 | } | |
1b4bf461 | 8117 | return 0; |
e817f856 JDB |
8118 | |
8119 | err_rxq_info: | |
8120 | /* Rollback successful reg's and free other resources */ | |
8121 | while (i--) | |
8122 | xdp_rxq_info_unreg(&rx[i].xdp_rxq); | |
141b52a9 | 8123 | kvfree(dev->_rx); |
e817f856 JDB |
8124 | dev->_rx = NULL; |
8125 | return err; | |
8126 | } | |
8127 | ||
8128 | static void netif_free_rx_queues(struct net_device *dev) | |
8129 | { | |
8130 | unsigned int i, count = dev->num_rx_queues; | |
e817f856 JDB |
8131 | |
8132 | /* netif_alloc_rx_queues alloc failed, resources have been unreg'ed */ | |
8133 | if (!dev->_rx) | |
8134 | return; | |
8135 | ||
e817f856 | 8136 | for (i = 0; i < count; i++) |
82aaff2f JK |
8137 | xdp_rxq_info_unreg(&dev->_rx[i].xdp_rxq); |
8138 | ||
8139 | kvfree(dev->_rx); | |
1b4bf461 ED |
8140 | } |
8141 | ||
aa942104 CG |
8142 | static void netdev_init_one_queue(struct net_device *dev, |
8143 | struct netdev_queue *queue, void *_unused) | |
8144 | { | |
8145 | /* Initialize queue lock */ | |
8146 | spin_lock_init(&queue->_xmit_lock); | |
8147 | netdev_set_xmit_lockdep_class(&queue->_xmit_lock, dev->type); | |
8148 | queue->xmit_lock_owner = -1; | |
b236da69 | 8149 | netdev_queue_numa_node_write(queue, NUMA_NO_NODE); |
aa942104 | 8150 | queue->dev = dev; |
114cf580 TH |
8151 | #ifdef CONFIG_BQL |
8152 | dql_init(&queue->dql, HZ); | |
8153 | #endif | |
aa942104 CG |
8154 | } |
8155 | ||
60877a32 ED |
8156 | static void netif_free_tx_queues(struct net_device *dev) |
8157 | { | |
4cb28970 | 8158 | kvfree(dev->_tx); |
60877a32 ED |
8159 | } |
8160 | ||
e6484930 TH |
8161 | static int netif_alloc_netdev_queues(struct net_device *dev) |
8162 | { | |
8163 | unsigned int count = dev->num_tx_queues; | |
8164 | struct netdev_queue *tx; | |
60877a32 | 8165 | size_t sz = count * sizeof(*tx); |
e6484930 | 8166 | |
d339727c ED |
8167 | if (count < 1 || count > 0xffff) |
8168 | return -EINVAL; | |
62b5942a | 8169 | |
dcda9b04 | 8170 | tx = kvzalloc(sz, GFP_KERNEL | __GFP_RETRY_MAYFAIL); |
da6bc57a MH |
8171 | if (!tx) |
8172 | return -ENOMEM; | |
8173 | ||
e6484930 | 8174 | dev->_tx = tx; |
1d24eb48 | 8175 | |
e6484930 TH |
8176 | netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL); |
8177 | spin_lock_init(&dev->tx_global_lock); | |
aa942104 CG |
8178 | |
8179 | return 0; | |
e6484930 TH |
8180 | } |
8181 | ||
a2029240 DV |
8182 | void netif_tx_stop_all_queues(struct net_device *dev) |
8183 | { | |
8184 | unsigned int i; | |
8185 | ||
8186 | for (i = 0; i < dev->num_tx_queues; i++) { | |
8187 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
f4563a75 | 8188 | |
a2029240 DV |
8189 | netif_tx_stop_queue(txq); |
8190 | } | |
8191 | } | |
8192 | EXPORT_SYMBOL(netif_tx_stop_all_queues); | |
8193 | ||
1da177e4 LT |
8194 | /** |
8195 | * register_netdevice - register a network device | |
8196 | * @dev: device to register | |
8197 | * | |
8198 | * Take a completed network device structure and add it to the kernel | |
8199 | * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier | |
8200 | * chain. 0 is returned on success. A negative errno code is returned | |
8201 | * on a failure to set up the device, or if the name is a duplicate. | |
8202 | * | |
8203 | * Callers must hold the rtnl semaphore. You may want | |
8204 | * register_netdev() instead of this. | |
8205 | * | |
8206 | * BUGS: | |
8207 | * The locking appears insufficient to guarantee two parallel registers | |
8208 | * will not get the same name. | |
8209 | */ | |
8210 | ||
8211 | int register_netdevice(struct net_device *dev) | |
8212 | { | |
1da177e4 | 8213 | int ret; |
d314774c | 8214 | struct net *net = dev_net(dev); |
1da177e4 | 8215 | |
e283de3a FF |
8216 | BUILD_BUG_ON(sizeof(netdev_features_t) * BITS_PER_BYTE < |
8217 | NETDEV_FEATURE_COUNT); | |
1da177e4 LT |
8218 | BUG_ON(dev_boot_phase); |
8219 | ASSERT_RTNL(); | |
8220 | ||
b17a7c17 SH |
8221 | might_sleep(); |
8222 | ||
1da177e4 LT |
8223 | /* When net_device's are persistent, this will be fatal. */ |
8224 | BUG_ON(dev->reg_state != NETREG_UNINITIALIZED); | |
d314774c | 8225 | BUG_ON(!net); |
1da177e4 | 8226 | |
f1f28aa3 | 8227 | spin_lock_init(&dev->addr_list_lock); |
cf508b12 | 8228 | netdev_set_addr_lockdep_class(dev); |
1da177e4 | 8229 | |
828de4f6 | 8230 | ret = dev_get_valid_name(net, dev, dev->name); |
0696c3a8 PP |
8231 | if (ret < 0) |
8232 | goto out; | |
8233 | ||
1da177e4 | 8234 | /* Init, if this function is available */ |
d314774c SH |
8235 | if (dev->netdev_ops->ndo_init) { |
8236 | ret = dev->netdev_ops->ndo_init(dev); | |
1da177e4 LT |
8237 | if (ret) { |
8238 | if (ret > 0) | |
8239 | ret = -EIO; | |
90833aa4 | 8240 | goto out; |
1da177e4 LT |
8241 | } |
8242 | } | |
4ec93edb | 8243 | |
f646968f PM |
8244 | if (((dev->hw_features | dev->features) & |
8245 | NETIF_F_HW_VLAN_CTAG_FILTER) && | |
d2ed273d MM |
8246 | (!dev->netdev_ops->ndo_vlan_rx_add_vid || |
8247 | !dev->netdev_ops->ndo_vlan_rx_kill_vid)) { | |
8248 | netdev_WARN(dev, "Buggy VLAN acceleration in driver!\n"); | |
8249 | ret = -EINVAL; | |
8250 | goto err_uninit; | |
8251 | } | |
8252 | ||
9c7dafbf PE |
8253 | ret = -EBUSY; |
8254 | if (!dev->ifindex) | |
8255 | dev->ifindex = dev_new_index(net); | |
8256 | else if (__dev_get_by_index(net, dev->ifindex)) | |
8257 | goto err_uninit; | |
8258 | ||
5455c699 MM |
8259 | /* Transfer changeable features to wanted_features and enable |
8260 | * software offloads (GSO and GRO). | |
8261 | */ | |
8262 | dev->hw_features |= NETIF_F_SOFT_FEATURES; | |
14d1232f | 8263 | dev->features |= NETIF_F_SOFT_FEATURES; |
d764a122 SD |
8264 | |
8265 | if (dev->netdev_ops->ndo_udp_tunnel_add) { | |
8266 | dev->features |= NETIF_F_RX_UDP_TUNNEL_PORT; | |
8267 | dev->hw_features |= NETIF_F_RX_UDP_TUNNEL_PORT; | |
8268 | } | |
8269 | ||
14d1232f | 8270 | dev->wanted_features = dev->features & dev->hw_features; |
1da177e4 | 8271 | |
cbc53e08 | 8272 | if (!(dev->flags & IFF_LOOPBACK)) |
34324dc2 | 8273 | dev->hw_features |= NETIF_F_NOCACHE_COPY; |
cbc53e08 | 8274 | |
7f348a60 AD |
8275 | /* If IPv4 TCP segmentation offload is supported we should also |
8276 | * allow the device to enable segmenting the frame with the option | |
8277 | * of ignoring a static IP ID value. This doesn't enable the | |
8278 | * feature itself but allows the user to enable it later. | |
8279 | */ | |
cbc53e08 AD |
8280 | if (dev->hw_features & NETIF_F_TSO) |
8281 | dev->hw_features |= NETIF_F_TSO_MANGLEID; | |
7f348a60 AD |
8282 | if (dev->vlan_features & NETIF_F_TSO) |
8283 | dev->vlan_features |= NETIF_F_TSO_MANGLEID; | |
8284 | if (dev->mpls_features & NETIF_F_TSO) | |
8285 | dev->mpls_features |= NETIF_F_TSO_MANGLEID; | |
8286 | if (dev->hw_enc_features & NETIF_F_TSO) | |
8287 | dev->hw_enc_features |= NETIF_F_TSO_MANGLEID; | |
c6e1a0d1 | 8288 | |
1180e7d6 | 8289 | /* Make NETIF_F_HIGHDMA inheritable to VLAN devices. |
16c3ea78 | 8290 | */ |
1180e7d6 | 8291 | dev->vlan_features |= NETIF_F_HIGHDMA; |
16c3ea78 | 8292 | |
ee579677 PS |
8293 | /* Make NETIF_F_SG inheritable to tunnel devices. |
8294 | */ | |
802ab55a | 8295 | dev->hw_enc_features |= NETIF_F_SG | NETIF_F_GSO_PARTIAL; |
ee579677 | 8296 | |
0d89d203 SH |
8297 | /* Make NETIF_F_SG inheritable to MPLS. |
8298 | */ | |
8299 | dev->mpls_features |= NETIF_F_SG; | |
8300 | ||
7ffbe3fd JB |
8301 | ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev); |
8302 | ret = notifier_to_errno(ret); | |
8303 | if (ret) | |
8304 | goto err_uninit; | |
8305 | ||
8b41d188 | 8306 | ret = netdev_register_kobject(dev); |
b17a7c17 | 8307 | if (ret) |
7ce1b0ed | 8308 | goto err_uninit; |
b17a7c17 SH |
8309 | dev->reg_state = NETREG_REGISTERED; |
8310 | ||
6cb6a27c | 8311 | __netdev_update_features(dev); |
8e9b59b2 | 8312 | |
1da177e4 LT |
8313 | /* |
8314 | * Default initial state at registry is that the | |
8315 | * device is present. | |
8316 | */ | |
8317 | ||
8318 | set_bit(__LINK_STATE_PRESENT, &dev->state); | |
8319 | ||
8f4cccbb BH |
8320 | linkwatch_init_dev(dev); |
8321 | ||
1da177e4 | 8322 | dev_init_scheduler(dev); |
1da177e4 | 8323 | dev_hold(dev); |
ce286d32 | 8324 | list_netdevice(dev); |
7bf23575 | 8325 | add_device_randomness(dev->dev_addr, dev->addr_len); |
1da177e4 | 8326 | |
948b337e JP |
8327 | /* If the device has permanent device address, driver should |
8328 | * set dev_addr and also addr_assign_type should be set to | |
8329 | * NET_ADDR_PERM (default value). | |
8330 | */ | |
8331 | if (dev->addr_assign_type == NET_ADDR_PERM) | |
8332 | memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len); | |
8333 | ||
1da177e4 | 8334 | /* Notify protocols, that a new device appeared. */ |
056925ab | 8335 | ret = call_netdevice_notifiers(NETDEV_REGISTER, dev); |
fcc5a03a | 8336 | ret = notifier_to_errno(ret); |
93ee31f1 DL |
8337 | if (ret) { |
8338 | rollback_registered(dev); | |
8339 | dev->reg_state = NETREG_UNREGISTERED; | |
8340 | } | |
d90a909e EB |
8341 | /* |
8342 | * Prevent userspace races by waiting until the network | |
8343 | * device is fully setup before sending notifications. | |
8344 | */ | |
a2835763 PM |
8345 | if (!dev->rtnl_link_ops || |
8346 | dev->rtnl_link_state == RTNL_LINK_INITIALIZED) | |
7f294054 | 8347 | rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL); |
1da177e4 LT |
8348 | |
8349 | out: | |
8350 | return ret; | |
7ce1b0ed HX |
8351 | |
8352 | err_uninit: | |
d314774c SH |
8353 | if (dev->netdev_ops->ndo_uninit) |
8354 | dev->netdev_ops->ndo_uninit(dev); | |
cf124db5 DM |
8355 | if (dev->priv_destructor) |
8356 | dev->priv_destructor(dev); | |
7ce1b0ed | 8357 | goto out; |
1da177e4 | 8358 | } |
d1b19dff | 8359 | EXPORT_SYMBOL(register_netdevice); |
1da177e4 | 8360 | |
937f1ba5 BH |
8361 | /** |
8362 | * init_dummy_netdev - init a dummy network device for NAPI | |
8363 | * @dev: device to init | |
8364 | * | |
8365 | * This takes a network device structure and initialize the minimum | |
8366 | * amount of fields so it can be used to schedule NAPI polls without | |
8367 | * registering a full blown interface. This is to be used by drivers | |
8368 | * that need to tie several hardware interfaces to a single NAPI | |
8369 | * poll scheduler due to HW limitations. | |
8370 | */ | |
8371 | int init_dummy_netdev(struct net_device *dev) | |
8372 | { | |
8373 | /* Clear everything. Note we don't initialize spinlocks | |
8374 | * are they aren't supposed to be taken by any of the | |
8375 | * NAPI code and this dummy netdev is supposed to be | |
8376 | * only ever used for NAPI polls | |
8377 | */ | |
8378 | memset(dev, 0, sizeof(struct net_device)); | |
8379 | ||
8380 | /* make sure we BUG if trying to hit standard | |
8381 | * register/unregister code path | |
8382 | */ | |
8383 | dev->reg_state = NETREG_DUMMY; | |
8384 | ||
937f1ba5 BH |
8385 | /* NAPI wants this */ |
8386 | INIT_LIST_HEAD(&dev->napi_list); | |
8387 | ||
8388 | /* a dummy interface is started by default */ | |
8389 | set_bit(__LINK_STATE_PRESENT, &dev->state); | |
8390 | set_bit(__LINK_STATE_START, &dev->state); | |
8391 | ||
29b4433d ED |
8392 | /* Note : We dont allocate pcpu_refcnt for dummy devices, |
8393 | * because users of this 'device' dont need to change | |
8394 | * its refcount. | |
8395 | */ | |
8396 | ||
937f1ba5 BH |
8397 | return 0; |
8398 | } | |
8399 | EXPORT_SYMBOL_GPL(init_dummy_netdev); | |
8400 | ||
8401 | ||
1da177e4 LT |
8402 | /** |
8403 | * register_netdev - register a network device | |
8404 | * @dev: device to register | |
8405 | * | |
8406 | * Take a completed network device structure and add it to the kernel | |
8407 | * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier | |
8408 | * chain. 0 is returned on success. A negative errno code is returned | |
8409 | * on a failure to set up the device, or if the name is a duplicate. | |
8410 | * | |
38b4da38 | 8411 | * This is a wrapper around register_netdevice that takes the rtnl semaphore |
1da177e4 LT |
8412 | * and expands the device name if you passed a format string to |
8413 | * alloc_netdev. | |
8414 | */ | |
8415 | int register_netdev(struct net_device *dev) | |
8416 | { | |
8417 | int err; | |
8418 | ||
b0f3debc KT |
8419 | if (rtnl_lock_killable()) |
8420 | return -EINTR; | |
1da177e4 | 8421 | err = register_netdevice(dev); |
1da177e4 LT |
8422 | rtnl_unlock(); |
8423 | return err; | |
8424 | } | |
8425 | EXPORT_SYMBOL(register_netdev); | |
8426 | ||
29b4433d ED |
8427 | int netdev_refcnt_read(const struct net_device *dev) |
8428 | { | |
8429 | int i, refcnt = 0; | |
8430 | ||
8431 | for_each_possible_cpu(i) | |
8432 | refcnt += *per_cpu_ptr(dev->pcpu_refcnt, i); | |
8433 | return refcnt; | |
8434 | } | |
8435 | EXPORT_SYMBOL(netdev_refcnt_read); | |
8436 | ||
2c53040f | 8437 | /** |
1da177e4 | 8438 | * netdev_wait_allrefs - wait until all references are gone. |
3de7a37b | 8439 | * @dev: target net_device |
1da177e4 LT |
8440 | * |
8441 | * This is called when unregistering network devices. | |
8442 | * | |
8443 | * Any protocol or device that holds a reference should register | |
8444 | * for netdevice notification, and cleanup and put back the | |
8445 | * reference if they receive an UNREGISTER event. | |
8446 | * We can get stuck here if buggy protocols don't correctly | |
4ec93edb | 8447 | * call dev_put. |
1da177e4 LT |
8448 | */ |
8449 | static void netdev_wait_allrefs(struct net_device *dev) | |
8450 | { | |
8451 | unsigned long rebroadcast_time, warning_time; | |
29b4433d | 8452 | int refcnt; |
1da177e4 | 8453 | |
e014debe ED |
8454 | linkwatch_forget_dev(dev); |
8455 | ||
1da177e4 | 8456 | rebroadcast_time = warning_time = jiffies; |
29b4433d ED |
8457 | refcnt = netdev_refcnt_read(dev); |
8458 | ||
8459 | while (refcnt != 0) { | |
1da177e4 | 8460 | if (time_after(jiffies, rebroadcast_time + 1 * HZ)) { |
6756ae4b | 8461 | rtnl_lock(); |
1da177e4 LT |
8462 | |
8463 | /* Rebroadcast unregister notification */ | |
056925ab | 8464 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); |
1da177e4 | 8465 | |
748e2d93 | 8466 | __rtnl_unlock(); |
0115e8e3 | 8467 | rcu_barrier(); |
748e2d93 ED |
8468 | rtnl_lock(); |
8469 | ||
1da177e4 LT |
8470 | if (test_bit(__LINK_STATE_LINKWATCH_PENDING, |
8471 | &dev->state)) { | |
8472 | /* We must not have linkwatch events | |
8473 | * pending on unregister. If this | |
8474 | * happens, we simply run the queue | |
8475 | * unscheduled, resulting in a noop | |
8476 | * for this device. | |
8477 | */ | |
8478 | linkwatch_run_queue(); | |
8479 | } | |
8480 | ||
6756ae4b | 8481 | __rtnl_unlock(); |
1da177e4 LT |
8482 | |
8483 | rebroadcast_time = jiffies; | |
8484 | } | |
8485 | ||
8486 | msleep(250); | |
8487 | ||
29b4433d ED |
8488 | refcnt = netdev_refcnt_read(dev); |
8489 | ||
1da177e4 | 8490 | if (time_after(jiffies, warning_time + 10 * HZ)) { |
7b6cd1ce JP |
8491 | pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n", |
8492 | dev->name, refcnt); | |
1da177e4 LT |
8493 | warning_time = jiffies; |
8494 | } | |
8495 | } | |
8496 | } | |
8497 | ||
8498 | /* The sequence is: | |
8499 | * | |
8500 | * rtnl_lock(); | |
8501 | * ... | |
8502 | * register_netdevice(x1); | |
8503 | * register_netdevice(x2); | |
8504 | * ... | |
8505 | * unregister_netdevice(y1); | |
8506 | * unregister_netdevice(y2); | |
8507 | * ... | |
8508 | * rtnl_unlock(); | |
8509 | * free_netdev(y1); | |
8510 | * free_netdev(y2); | |
8511 | * | |
58ec3b4d | 8512 | * We are invoked by rtnl_unlock(). |
1da177e4 | 8513 | * This allows us to deal with problems: |
b17a7c17 | 8514 | * 1) We can delete sysfs objects which invoke hotplug |
1da177e4 LT |
8515 | * without deadlocking with linkwatch via keventd. |
8516 | * 2) Since we run with the RTNL semaphore not held, we can sleep | |
8517 | * safely in order to wait for the netdev refcnt to drop to zero. | |
58ec3b4d HX |
8518 | * |
8519 | * We must not return until all unregister events added during | |
8520 | * the interval the lock was held have been completed. | |
1da177e4 | 8521 | */ |
1da177e4 LT |
8522 | void netdev_run_todo(void) |
8523 | { | |
626ab0e6 | 8524 | struct list_head list; |
1da177e4 | 8525 | |
1da177e4 | 8526 | /* Snapshot list, allow later requests */ |
626ab0e6 | 8527 | list_replace_init(&net_todo_list, &list); |
58ec3b4d HX |
8528 | |
8529 | __rtnl_unlock(); | |
626ab0e6 | 8530 | |
0115e8e3 ED |
8531 | |
8532 | /* Wait for rcu callbacks to finish before next phase */ | |
850a545b EB |
8533 | if (!list_empty(&list)) |
8534 | rcu_barrier(); | |
8535 | ||
1da177e4 LT |
8536 | while (!list_empty(&list)) { |
8537 | struct net_device *dev | |
e5e26d75 | 8538 | = list_first_entry(&list, struct net_device, todo_list); |
1da177e4 LT |
8539 | list_del(&dev->todo_list); |
8540 | ||
b17a7c17 | 8541 | if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) { |
7b6cd1ce | 8542 | pr_err("network todo '%s' but state %d\n", |
b17a7c17 SH |
8543 | dev->name, dev->reg_state); |
8544 | dump_stack(); | |
8545 | continue; | |
8546 | } | |
1da177e4 | 8547 | |
b17a7c17 | 8548 | dev->reg_state = NETREG_UNREGISTERED; |
1da177e4 | 8549 | |
b17a7c17 | 8550 | netdev_wait_allrefs(dev); |
1da177e4 | 8551 | |
b17a7c17 | 8552 | /* paranoia */ |
29b4433d | 8553 | BUG_ON(netdev_refcnt_read(dev)); |
7866a621 SN |
8554 | BUG_ON(!list_empty(&dev->ptype_all)); |
8555 | BUG_ON(!list_empty(&dev->ptype_specific)); | |
33d480ce ED |
8556 | WARN_ON(rcu_access_pointer(dev->ip_ptr)); |
8557 | WARN_ON(rcu_access_pointer(dev->ip6_ptr)); | |
330c7272 | 8558 | #if IS_ENABLED(CONFIG_DECNET) |
547b792c | 8559 | WARN_ON(dev->dn_ptr); |
330c7272 | 8560 | #endif |
cf124db5 DM |
8561 | if (dev->priv_destructor) |
8562 | dev->priv_destructor(dev); | |
8563 | if (dev->needs_free_netdev) | |
8564 | free_netdev(dev); | |
9093bbb2 | 8565 | |
50624c93 EB |
8566 | /* Report a network device has been unregistered */ |
8567 | rtnl_lock(); | |
8568 | dev_net(dev)->dev_unreg_count--; | |
8569 | __rtnl_unlock(); | |
8570 | wake_up(&netdev_unregistering_wq); | |
8571 | ||
9093bbb2 SH |
8572 | /* Free network device */ |
8573 | kobject_put(&dev->dev.kobj); | |
1da177e4 | 8574 | } |
1da177e4 LT |
8575 | } |
8576 | ||
9256645a JW |
8577 | /* Convert net_device_stats to rtnl_link_stats64. rtnl_link_stats64 has |
8578 | * all the same fields in the same order as net_device_stats, with only | |
8579 | * the type differing, but rtnl_link_stats64 may have additional fields | |
8580 | * at the end for newer counters. | |
3cfde79c | 8581 | */ |
77a1abf5 ED |
8582 | void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64, |
8583 | const struct net_device_stats *netdev_stats) | |
3cfde79c BH |
8584 | { |
8585 | #if BITS_PER_LONG == 64 | |
9256645a | 8586 | BUILD_BUG_ON(sizeof(*stats64) < sizeof(*netdev_stats)); |
9af9959e | 8587 | memcpy(stats64, netdev_stats, sizeof(*netdev_stats)); |
9256645a JW |
8588 | /* zero out counters that only exist in rtnl_link_stats64 */ |
8589 | memset((char *)stats64 + sizeof(*netdev_stats), 0, | |
8590 | sizeof(*stats64) - sizeof(*netdev_stats)); | |
3cfde79c | 8591 | #else |
9256645a | 8592 | size_t i, n = sizeof(*netdev_stats) / sizeof(unsigned long); |
3cfde79c BH |
8593 | const unsigned long *src = (const unsigned long *)netdev_stats; |
8594 | u64 *dst = (u64 *)stats64; | |
8595 | ||
9256645a | 8596 | BUILD_BUG_ON(n > sizeof(*stats64) / sizeof(u64)); |
3cfde79c BH |
8597 | for (i = 0; i < n; i++) |
8598 | dst[i] = src[i]; | |
9256645a JW |
8599 | /* zero out counters that only exist in rtnl_link_stats64 */ |
8600 | memset((char *)stats64 + n * sizeof(u64), 0, | |
8601 | sizeof(*stats64) - n * sizeof(u64)); | |
3cfde79c BH |
8602 | #endif |
8603 | } | |
77a1abf5 | 8604 | EXPORT_SYMBOL(netdev_stats_to_stats64); |
3cfde79c | 8605 | |
eeda3fd6 SH |
8606 | /** |
8607 | * dev_get_stats - get network device statistics | |
8608 | * @dev: device to get statistics from | |
28172739 | 8609 | * @storage: place to store stats |
eeda3fd6 | 8610 | * |
d7753516 BH |
8611 | * Get network statistics from device. Return @storage. |
8612 | * The device driver may provide its own method by setting | |
8613 | * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats; | |
8614 | * otherwise the internal statistics structure is used. | |
eeda3fd6 | 8615 | */ |
d7753516 BH |
8616 | struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev, |
8617 | struct rtnl_link_stats64 *storage) | |
7004bf25 | 8618 | { |
eeda3fd6 SH |
8619 | const struct net_device_ops *ops = dev->netdev_ops; |
8620 | ||
28172739 ED |
8621 | if (ops->ndo_get_stats64) { |
8622 | memset(storage, 0, sizeof(*storage)); | |
caf586e5 ED |
8623 | ops->ndo_get_stats64(dev, storage); |
8624 | } else if (ops->ndo_get_stats) { | |
3cfde79c | 8625 | netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev)); |
caf586e5 ED |
8626 | } else { |
8627 | netdev_stats_to_stats64(storage, &dev->stats); | |
28172739 | 8628 | } |
6f64ec74 ED |
8629 | storage->rx_dropped += (unsigned long)atomic_long_read(&dev->rx_dropped); |
8630 | storage->tx_dropped += (unsigned long)atomic_long_read(&dev->tx_dropped); | |
8631 | storage->rx_nohandler += (unsigned long)atomic_long_read(&dev->rx_nohandler); | |
28172739 | 8632 | return storage; |
c45d286e | 8633 | } |
eeda3fd6 | 8634 | EXPORT_SYMBOL(dev_get_stats); |
c45d286e | 8635 | |
24824a09 | 8636 | struct netdev_queue *dev_ingress_queue_create(struct net_device *dev) |
dc2b4847 | 8637 | { |
24824a09 | 8638 | struct netdev_queue *queue = dev_ingress_queue(dev); |
dc2b4847 | 8639 | |
24824a09 ED |
8640 | #ifdef CONFIG_NET_CLS_ACT |
8641 | if (queue) | |
8642 | return queue; | |
8643 | queue = kzalloc(sizeof(*queue), GFP_KERNEL); | |
8644 | if (!queue) | |
8645 | return NULL; | |
8646 | netdev_init_one_queue(dev, queue, NULL); | |
2ce1ee17 | 8647 | RCU_INIT_POINTER(queue->qdisc, &noop_qdisc); |
24824a09 ED |
8648 | queue->qdisc_sleeping = &noop_qdisc; |
8649 | rcu_assign_pointer(dev->ingress_queue, queue); | |
8650 | #endif | |
8651 | return queue; | |
bb949fbd DM |
8652 | } |
8653 | ||
2c60db03 ED |
8654 | static const struct ethtool_ops default_ethtool_ops; |
8655 | ||
d07d7507 SG |
8656 | void netdev_set_default_ethtool_ops(struct net_device *dev, |
8657 | const struct ethtool_ops *ops) | |
8658 | { | |
8659 | if (dev->ethtool_ops == &default_ethtool_ops) | |
8660 | dev->ethtool_ops = ops; | |
8661 | } | |
8662 | EXPORT_SYMBOL_GPL(netdev_set_default_ethtool_ops); | |
8663 | ||
74d332c1 ED |
8664 | void netdev_freemem(struct net_device *dev) |
8665 | { | |
8666 | char *addr = (char *)dev - dev->padded; | |
8667 | ||
4cb28970 | 8668 | kvfree(addr); |
74d332c1 ED |
8669 | } |
8670 | ||
1da177e4 | 8671 | /** |
722c9a0c | 8672 | * alloc_netdev_mqs - allocate network device |
8673 | * @sizeof_priv: size of private data to allocate space for | |
8674 | * @name: device name format string | |
8675 | * @name_assign_type: origin of device name | |
8676 | * @setup: callback to initialize device | |
8677 | * @txqs: the number of TX subqueues to allocate | |
8678 | * @rxqs: the number of RX subqueues to allocate | |
8679 | * | |
8680 | * Allocates a struct net_device with private data area for driver use | |
8681 | * and performs basic initialization. Also allocates subqueue structs | |
8682 | * for each queue on the device. | |
1da177e4 | 8683 | */ |
36909ea4 | 8684 | struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name, |
c835a677 | 8685 | unsigned char name_assign_type, |
36909ea4 TH |
8686 | void (*setup)(struct net_device *), |
8687 | unsigned int txqs, unsigned int rxqs) | |
1da177e4 | 8688 | { |
1da177e4 | 8689 | struct net_device *dev; |
52a59bd5 | 8690 | unsigned int alloc_size; |
1ce8e7b5 | 8691 | struct net_device *p; |
1da177e4 | 8692 | |
b6fe17d6 SH |
8693 | BUG_ON(strlen(name) >= sizeof(dev->name)); |
8694 | ||
36909ea4 | 8695 | if (txqs < 1) { |
7b6cd1ce | 8696 | pr_err("alloc_netdev: Unable to allocate device with zero queues\n"); |
55513fb4 TH |
8697 | return NULL; |
8698 | } | |
8699 | ||
36909ea4 | 8700 | if (rxqs < 1) { |
7b6cd1ce | 8701 | pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n"); |
36909ea4 TH |
8702 | return NULL; |
8703 | } | |
36909ea4 | 8704 | |
fd2ea0a7 | 8705 | alloc_size = sizeof(struct net_device); |
d1643d24 AD |
8706 | if (sizeof_priv) { |
8707 | /* ensure 32-byte alignment of private area */ | |
1ce8e7b5 | 8708 | alloc_size = ALIGN(alloc_size, NETDEV_ALIGN); |
d1643d24 AD |
8709 | alloc_size += sizeof_priv; |
8710 | } | |
8711 | /* ensure 32-byte alignment of whole construct */ | |
1ce8e7b5 | 8712 | alloc_size += NETDEV_ALIGN - 1; |
1da177e4 | 8713 | |
dcda9b04 | 8714 | p = kvzalloc(alloc_size, GFP_KERNEL | __GFP_RETRY_MAYFAIL); |
62b5942a | 8715 | if (!p) |
1da177e4 | 8716 | return NULL; |
1da177e4 | 8717 | |
1ce8e7b5 | 8718 | dev = PTR_ALIGN(p, NETDEV_ALIGN); |
1da177e4 | 8719 | dev->padded = (char *)dev - (char *)p; |
ab9c73cc | 8720 | |
29b4433d ED |
8721 | dev->pcpu_refcnt = alloc_percpu(int); |
8722 | if (!dev->pcpu_refcnt) | |
74d332c1 | 8723 | goto free_dev; |
ab9c73cc | 8724 | |
ab9c73cc | 8725 | if (dev_addr_init(dev)) |
29b4433d | 8726 | goto free_pcpu; |
ab9c73cc | 8727 | |
22bedad3 | 8728 | dev_mc_init(dev); |
a748ee24 | 8729 | dev_uc_init(dev); |
ccffad25 | 8730 | |
c346dca1 | 8731 | dev_net_set(dev, &init_net); |
1da177e4 | 8732 | |
8d3bdbd5 | 8733 | dev->gso_max_size = GSO_MAX_SIZE; |
30b678d8 | 8734 | dev->gso_max_segs = GSO_MAX_SEGS; |
8d3bdbd5 | 8735 | |
8d3bdbd5 DM |
8736 | INIT_LIST_HEAD(&dev->napi_list); |
8737 | INIT_LIST_HEAD(&dev->unreg_list); | |
5cde2829 | 8738 | INIT_LIST_HEAD(&dev->close_list); |
8d3bdbd5 | 8739 | INIT_LIST_HEAD(&dev->link_watch_list); |
2f268f12 VF |
8740 | INIT_LIST_HEAD(&dev->adj_list.upper); |
8741 | INIT_LIST_HEAD(&dev->adj_list.lower); | |
7866a621 SN |
8742 | INIT_LIST_HEAD(&dev->ptype_all); |
8743 | INIT_LIST_HEAD(&dev->ptype_specific); | |
59cc1f61 JK |
8744 | #ifdef CONFIG_NET_SCHED |
8745 | hash_init(dev->qdisc_hash); | |
8746 | #endif | |
02875878 | 8747 | dev->priv_flags = IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM; |
8d3bdbd5 DM |
8748 | setup(dev); |
8749 | ||
a813104d | 8750 | if (!dev->tx_queue_len) { |
f84bb1ea | 8751 | dev->priv_flags |= IFF_NO_QUEUE; |
11597084 | 8752 | dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN; |
a813104d | 8753 | } |
906470c1 | 8754 | |
36909ea4 TH |
8755 | dev->num_tx_queues = txqs; |
8756 | dev->real_num_tx_queues = txqs; | |
ed9af2e8 | 8757 | if (netif_alloc_netdev_queues(dev)) |
8d3bdbd5 | 8758 | goto free_all; |
e8a0464c | 8759 | |
36909ea4 TH |
8760 | dev->num_rx_queues = rxqs; |
8761 | dev->real_num_rx_queues = rxqs; | |
fe822240 | 8762 | if (netif_alloc_rx_queues(dev)) |
8d3bdbd5 | 8763 | goto free_all; |
0a9627f2 | 8764 | |
1da177e4 | 8765 | strcpy(dev->name, name); |
c835a677 | 8766 | dev->name_assign_type = name_assign_type; |
cbda10fa | 8767 | dev->group = INIT_NETDEV_GROUP; |
2c60db03 ED |
8768 | if (!dev->ethtool_ops) |
8769 | dev->ethtool_ops = &default_ethtool_ops; | |
e687ad60 PN |
8770 | |
8771 | nf_hook_ingress_init(dev); | |
8772 | ||
1da177e4 | 8773 | return dev; |
ab9c73cc | 8774 | |
8d3bdbd5 DM |
8775 | free_all: |
8776 | free_netdev(dev); | |
8777 | return NULL; | |
8778 | ||
29b4433d ED |
8779 | free_pcpu: |
8780 | free_percpu(dev->pcpu_refcnt); | |
74d332c1 ED |
8781 | free_dev: |
8782 | netdev_freemem(dev); | |
ab9c73cc | 8783 | return NULL; |
1da177e4 | 8784 | } |
36909ea4 | 8785 | EXPORT_SYMBOL(alloc_netdev_mqs); |
1da177e4 LT |
8786 | |
8787 | /** | |
722c9a0c | 8788 | * free_netdev - free network device |
8789 | * @dev: device | |
1da177e4 | 8790 | * |
722c9a0c | 8791 | * This function does the last stage of destroying an allocated device |
8792 | * interface. The reference to the device object is released. If this | |
8793 | * is the last reference then it will be freed.Must be called in process | |
8794 | * context. | |
1da177e4 LT |
8795 | */ |
8796 | void free_netdev(struct net_device *dev) | |
8797 | { | |
d565b0a1 HX |
8798 | struct napi_struct *p, *n; |
8799 | ||
93d05d4a | 8800 | might_sleep(); |
60877a32 | 8801 | netif_free_tx_queues(dev); |
e817f856 | 8802 | netif_free_rx_queues(dev); |
e8a0464c | 8803 | |
33d480ce | 8804 | kfree(rcu_dereference_protected(dev->ingress_queue, 1)); |
24824a09 | 8805 | |
f001fde5 JP |
8806 | /* Flush device addresses */ |
8807 | dev_addr_flush(dev); | |
8808 | ||
d565b0a1 HX |
8809 | list_for_each_entry_safe(p, n, &dev->napi_list, dev_list) |
8810 | netif_napi_del(p); | |
8811 | ||
29b4433d ED |
8812 | free_percpu(dev->pcpu_refcnt); |
8813 | dev->pcpu_refcnt = NULL; | |
8814 | ||
3041a069 | 8815 | /* Compatibility with error handling in drivers */ |
1da177e4 | 8816 | if (dev->reg_state == NETREG_UNINITIALIZED) { |
74d332c1 | 8817 | netdev_freemem(dev); |
1da177e4 LT |
8818 | return; |
8819 | } | |
8820 | ||
8821 | BUG_ON(dev->reg_state != NETREG_UNREGISTERED); | |
8822 | dev->reg_state = NETREG_RELEASED; | |
8823 | ||
43cb76d9 GKH |
8824 | /* will free via device release */ |
8825 | put_device(&dev->dev); | |
1da177e4 | 8826 | } |
d1b19dff | 8827 | EXPORT_SYMBOL(free_netdev); |
4ec93edb | 8828 | |
f0db275a SH |
8829 | /** |
8830 | * synchronize_net - Synchronize with packet receive processing | |
8831 | * | |
8832 | * Wait for packets currently being received to be done. | |
8833 | * Does not block later packets from starting. | |
8834 | */ | |
4ec93edb | 8835 | void synchronize_net(void) |
1da177e4 LT |
8836 | { |
8837 | might_sleep(); | |
be3fc413 ED |
8838 | if (rtnl_is_locked()) |
8839 | synchronize_rcu_expedited(); | |
8840 | else | |
8841 | synchronize_rcu(); | |
1da177e4 | 8842 | } |
d1b19dff | 8843 | EXPORT_SYMBOL(synchronize_net); |
1da177e4 LT |
8844 | |
8845 | /** | |
44a0873d | 8846 | * unregister_netdevice_queue - remove device from the kernel |
1da177e4 | 8847 | * @dev: device |
44a0873d | 8848 | * @head: list |
6ebfbc06 | 8849 | * |
1da177e4 | 8850 | * This function shuts down a device interface and removes it |
d59b54b1 | 8851 | * from the kernel tables. |
44a0873d | 8852 | * If head not NULL, device is queued to be unregistered later. |
1da177e4 LT |
8853 | * |
8854 | * Callers must hold the rtnl semaphore. You may want | |
8855 | * unregister_netdev() instead of this. | |
8856 | */ | |
8857 | ||
44a0873d | 8858 | void unregister_netdevice_queue(struct net_device *dev, struct list_head *head) |
1da177e4 | 8859 | { |
a6620712 HX |
8860 | ASSERT_RTNL(); |
8861 | ||
44a0873d | 8862 | if (head) { |
9fdce099 | 8863 | list_move_tail(&dev->unreg_list, head); |
44a0873d ED |
8864 | } else { |
8865 | rollback_registered(dev); | |
8866 | /* Finish processing unregister after unlock */ | |
8867 | net_set_todo(dev); | |
8868 | } | |
1da177e4 | 8869 | } |
44a0873d | 8870 | EXPORT_SYMBOL(unregister_netdevice_queue); |
1da177e4 | 8871 | |
9b5e383c ED |
8872 | /** |
8873 | * unregister_netdevice_many - unregister many devices | |
8874 | * @head: list of devices | |
87757a91 ED |
8875 | * |
8876 | * Note: As most callers use a stack allocated list_head, | |
8877 | * we force a list_del() to make sure stack wont be corrupted later. | |
9b5e383c ED |
8878 | */ |
8879 | void unregister_netdevice_many(struct list_head *head) | |
8880 | { | |
8881 | struct net_device *dev; | |
8882 | ||
8883 | if (!list_empty(head)) { | |
8884 | rollback_registered_many(head); | |
8885 | list_for_each_entry(dev, head, unreg_list) | |
8886 | net_set_todo(dev); | |
87757a91 | 8887 | list_del(head); |
9b5e383c ED |
8888 | } |
8889 | } | |
63c8099d | 8890 | EXPORT_SYMBOL(unregister_netdevice_many); |
9b5e383c | 8891 | |
1da177e4 LT |
8892 | /** |
8893 | * unregister_netdev - remove device from the kernel | |
8894 | * @dev: device | |
8895 | * | |
8896 | * This function shuts down a device interface and removes it | |
d59b54b1 | 8897 | * from the kernel tables. |
1da177e4 LT |
8898 | * |
8899 | * This is just a wrapper for unregister_netdevice that takes | |
8900 | * the rtnl semaphore. In general you want to use this and not | |
8901 | * unregister_netdevice. | |
8902 | */ | |
8903 | void unregister_netdev(struct net_device *dev) | |
8904 | { | |
8905 | rtnl_lock(); | |
8906 | unregister_netdevice(dev); | |
8907 | rtnl_unlock(); | |
8908 | } | |
1da177e4 LT |
8909 | EXPORT_SYMBOL(unregister_netdev); |
8910 | ||
ce286d32 EB |
8911 | /** |
8912 | * dev_change_net_namespace - move device to different nethost namespace | |
8913 | * @dev: device | |
8914 | * @net: network namespace | |
8915 | * @pat: If not NULL name pattern to try if the current device name | |
8916 | * is already taken in the destination network namespace. | |
8917 | * | |
8918 | * This function shuts down a device interface and moves it | |
8919 | * to a new network namespace. On success 0 is returned, on | |
8920 | * a failure a netagive errno code is returned. | |
8921 | * | |
8922 | * Callers must hold the rtnl semaphore. | |
8923 | */ | |
8924 | ||
8925 | int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat) | |
8926 | { | |
38e01b30 | 8927 | int err, new_nsid, new_ifindex; |
ce286d32 EB |
8928 | |
8929 | ASSERT_RTNL(); | |
8930 | ||
8931 | /* Don't allow namespace local devices to be moved. */ | |
8932 | err = -EINVAL; | |
8933 | if (dev->features & NETIF_F_NETNS_LOCAL) | |
8934 | goto out; | |
8935 | ||
8936 | /* Ensure the device has been registrered */ | |
ce286d32 EB |
8937 | if (dev->reg_state != NETREG_REGISTERED) |
8938 | goto out; | |
8939 | ||
8940 | /* Get out if there is nothing todo */ | |
8941 | err = 0; | |
878628fb | 8942 | if (net_eq(dev_net(dev), net)) |
ce286d32 EB |
8943 | goto out; |
8944 | ||
8945 | /* Pick the destination device name, and ensure | |
8946 | * we can use it in the destination network namespace. | |
8947 | */ | |
8948 | err = -EEXIST; | |
d9031024 | 8949 | if (__dev_get_by_name(net, dev->name)) { |
ce286d32 EB |
8950 | /* We get here if we can't use the current device name */ |
8951 | if (!pat) | |
8952 | goto out; | |
7892bd08 LR |
8953 | err = dev_get_valid_name(net, dev, pat); |
8954 | if (err < 0) | |
ce286d32 EB |
8955 | goto out; |
8956 | } | |
8957 | ||
8958 | /* | |
8959 | * And now a mini version of register_netdevice unregister_netdevice. | |
8960 | */ | |
8961 | ||
8962 | /* If device is running close it first. */ | |
9b772652 | 8963 | dev_close(dev); |
ce286d32 EB |
8964 | |
8965 | /* And unlink it from device chain */ | |
ce286d32 EB |
8966 | unlist_netdevice(dev); |
8967 | ||
8968 | synchronize_net(); | |
8969 | ||
8970 | /* Shutdown queueing discipline. */ | |
8971 | dev_shutdown(dev); | |
8972 | ||
8973 | /* Notify protocols, that we are about to destroy | |
eb13da1a | 8974 | * this device. They should clean all the things. |
8975 | * | |
8976 | * Note that dev->reg_state stays at NETREG_REGISTERED. | |
8977 | * This is wanted because this way 8021q and macvlan know | |
8978 | * the device is just moving and can keep their slaves up. | |
8979 | */ | |
ce286d32 | 8980 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); |
6549dd43 | 8981 | rcu_barrier(); |
38e01b30 | 8982 | |
c36ac8e2 | 8983 | new_nsid = peernet2id_alloc(dev_net(dev), net); |
38e01b30 ND |
8984 | /* If there is an ifindex conflict assign a new one */ |
8985 | if (__dev_get_by_index(net, dev->ifindex)) | |
8986 | new_ifindex = dev_new_index(net); | |
8987 | else | |
8988 | new_ifindex = dev->ifindex; | |
8989 | ||
8990 | rtmsg_ifinfo_newnet(RTM_DELLINK, dev, ~0U, GFP_KERNEL, &new_nsid, | |
8991 | new_ifindex); | |
ce286d32 EB |
8992 | |
8993 | /* | |
8994 | * Flush the unicast and multicast chains | |
8995 | */ | |
a748ee24 | 8996 | dev_uc_flush(dev); |
22bedad3 | 8997 | dev_mc_flush(dev); |
ce286d32 | 8998 | |
4e66ae2e SH |
8999 | /* Send a netdev-removed uevent to the old namespace */ |
9000 | kobject_uevent(&dev->dev.kobj, KOBJ_REMOVE); | |
4c75431a | 9001 | netdev_adjacent_del_links(dev); |
4e66ae2e | 9002 | |
ce286d32 | 9003 | /* Actually switch the network namespace */ |
c346dca1 | 9004 | dev_net_set(dev, net); |
38e01b30 | 9005 | dev->ifindex = new_ifindex; |
ce286d32 | 9006 | |
4e66ae2e SH |
9007 | /* Send a netdev-add uevent to the new namespace */ |
9008 | kobject_uevent(&dev->dev.kobj, KOBJ_ADD); | |
4c75431a | 9009 | netdev_adjacent_add_links(dev); |
4e66ae2e | 9010 | |
8b41d188 | 9011 | /* Fixup kobjects */ |
a1b3f594 | 9012 | err = device_rename(&dev->dev, dev->name); |
8b41d188 | 9013 | WARN_ON(err); |
ce286d32 EB |
9014 | |
9015 | /* Add the device back in the hashes */ | |
9016 | list_netdevice(dev); | |
9017 | ||
9018 | /* Notify protocols, that a new device appeared. */ | |
9019 | call_netdevice_notifiers(NETDEV_REGISTER, dev); | |
9020 | ||
d90a909e EB |
9021 | /* |
9022 | * Prevent userspace races by waiting until the network | |
9023 | * device is fully setup before sending notifications. | |
9024 | */ | |
7f294054 | 9025 | rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL); |
d90a909e | 9026 | |
ce286d32 EB |
9027 | synchronize_net(); |
9028 | err = 0; | |
9029 | out: | |
9030 | return err; | |
9031 | } | |
463d0183 | 9032 | EXPORT_SYMBOL_GPL(dev_change_net_namespace); |
ce286d32 | 9033 | |
f0bf90de | 9034 | static int dev_cpu_dead(unsigned int oldcpu) |
1da177e4 LT |
9035 | { |
9036 | struct sk_buff **list_skb; | |
1da177e4 | 9037 | struct sk_buff *skb; |
f0bf90de | 9038 | unsigned int cpu; |
97d8b6e3 | 9039 | struct softnet_data *sd, *oldsd, *remsd = NULL; |
1da177e4 | 9040 | |
1da177e4 LT |
9041 | local_irq_disable(); |
9042 | cpu = smp_processor_id(); | |
9043 | sd = &per_cpu(softnet_data, cpu); | |
9044 | oldsd = &per_cpu(softnet_data, oldcpu); | |
9045 | ||
9046 | /* Find end of our completion_queue. */ | |
9047 | list_skb = &sd->completion_queue; | |
9048 | while (*list_skb) | |
9049 | list_skb = &(*list_skb)->next; | |
9050 | /* Append completion queue from offline CPU. */ | |
9051 | *list_skb = oldsd->completion_queue; | |
9052 | oldsd->completion_queue = NULL; | |
9053 | ||
1da177e4 | 9054 | /* Append output queue from offline CPU. */ |
a9cbd588 CG |
9055 | if (oldsd->output_queue) { |
9056 | *sd->output_queue_tailp = oldsd->output_queue; | |
9057 | sd->output_queue_tailp = oldsd->output_queue_tailp; | |
9058 | oldsd->output_queue = NULL; | |
9059 | oldsd->output_queue_tailp = &oldsd->output_queue; | |
9060 | } | |
ac64da0b ED |
9061 | /* Append NAPI poll list from offline CPU, with one exception : |
9062 | * process_backlog() must be called by cpu owning percpu backlog. | |
9063 | * We properly handle process_queue & input_pkt_queue later. | |
9064 | */ | |
9065 | while (!list_empty(&oldsd->poll_list)) { | |
9066 | struct napi_struct *napi = list_first_entry(&oldsd->poll_list, | |
9067 | struct napi_struct, | |
9068 | poll_list); | |
9069 | ||
9070 | list_del_init(&napi->poll_list); | |
9071 | if (napi->poll == process_backlog) | |
9072 | napi->state = 0; | |
9073 | else | |
9074 | ____napi_schedule(sd, napi); | |
264524d5 | 9075 | } |
1da177e4 LT |
9076 | |
9077 | raise_softirq_irqoff(NET_TX_SOFTIRQ); | |
9078 | local_irq_enable(); | |
9079 | ||
773fc8f6 | 9080 | #ifdef CONFIG_RPS |
9081 | remsd = oldsd->rps_ipi_list; | |
9082 | oldsd->rps_ipi_list = NULL; | |
9083 | #endif | |
9084 | /* send out pending IPI's on offline CPU */ | |
9085 | net_rps_send_ipi(remsd); | |
9086 | ||
1da177e4 | 9087 | /* Process offline CPU's input_pkt_queue */ |
76cc8b13 | 9088 | while ((skb = __skb_dequeue(&oldsd->process_queue))) { |
91e83133 | 9089 | netif_rx_ni(skb); |
76cc8b13 | 9090 | input_queue_head_incr(oldsd); |
fec5e652 | 9091 | } |
ac64da0b | 9092 | while ((skb = skb_dequeue(&oldsd->input_pkt_queue))) { |
91e83133 | 9093 | netif_rx_ni(skb); |
76cc8b13 TH |
9094 | input_queue_head_incr(oldsd); |
9095 | } | |
1da177e4 | 9096 | |
f0bf90de | 9097 | return 0; |
1da177e4 | 9098 | } |
1da177e4 | 9099 | |
7f353bf2 | 9100 | /** |
b63365a2 HX |
9101 | * netdev_increment_features - increment feature set by one |
9102 | * @all: current feature set | |
9103 | * @one: new feature set | |
9104 | * @mask: mask feature set | |
7f353bf2 HX |
9105 | * |
9106 | * Computes a new feature set after adding a device with feature set | |
b63365a2 HX |
9107 | * @one to the master device with current feature set @all. Will not |
9108 | * enable anything that is off in @mask. Returns the new feature set. | |
7f353bf2 | 9109 | */ |
c8f44aff MM |
9110 | netdev_features_t netdev_increment_features(netdev_features_t all, |
9111 | netdev_features_t one, netdev_features_t mask) | |
b63365a2 | 9112 | { |
c8cd0989 | 9113 | if (mask & NETIF_F_HW_CSUM) |
a188222b | 9114 | mask |= NETIF_F_CSUM_MASK; |
1742f183 | 9115 | mask |= NETIF_F_VLAN_CHALLENGED; |
7f353bf2 | 9116 | |
a188222b | 9117 | all |= one & (NETIF_F_ONE_FOR_ALL | NETIF_F_CSUM_MASK) & mask; |
1742f183 | 9118 | all &= one | ~NETIF_F_ALL_FOR_ALL; |
c6e1a0d1 | 9119 | |
1742f183 | 9120 | /* If one device supports hw checksumming, set for all. */ |
c8cd0989 TH |
9121 | if (all & NETIF_F_HW_CSUM) |
9122 | all &= ~(NETIF_F_CSUM_MASK & ~NETIF_F_HW_CSUM); | |
7f353bf2 HX |
9123 | |
9124 | return all; | |
9125 | } | |
b63365a2 | 9126 | EXPORT_SYMBOL(netdev_increment_features); |
7f353bf2 | 9127 | |
430f03cd | 9128 | static struct hlist_head * __net_init netdev_create_hash(void) |
30d97d35 PE |
9129 | { |
9130 | int i; | |
9131 | struct hlist_head *hash; | |
9132 | ||
6da2ec56 | 9133 | hash = kmalloc_array(NETDEV_HASHENTRIES, sizeof(*hash), GFP_KERNEL); |
30d97d35 PE |
9134 | if (hash != NULL) |
9135 | for (i = 0; i < NETDEV_HASHENTRIES; i++) | |
9136 | INIT_HLIST_HEAD(&hash[i]); | |
9137 | ||
9138 | return hash; | |
9139 | } | |
9140 | ||
881d966b | 9141 | /* Initialize per network namespace state */ |
4665079c | 9142 | static int __net_init netdev_init(struct net *net) |
881d966b | 9143 | { |
734b6541 RM |
9144 | if (net != &init_net) |
9145 | INIT_LIST_HEAD(&net->dev_base_head); | |
881d966b | 9146 | |
30d97d35 PE |
9147 | net->dev_name_head = netdev_create_hash(); |
9148 | if (net->dev_name_head == NULL) | |
9149 | goto err_name; | |
881d966b | 9150 | |
30d97d35 PE |
9151 | net->dev_index_head = netdev_create_hash(); |
9152 | if (net->dev_index_head == NULL) | |
9153 | goto err_idx; | |
881d966b EB |
9154 | |
9155 | return 0; | |
30d97d35 PE |
9156 | |
9157 | err_idx: | |
9158 | kfree(net->dev_name_head); | |
9159 | err_name: | |
9160 | return -ENOMEM; | |
881d966b EB |
9161 | } |
9162 | ||
f0db275a SH |
9163 | /** |
9164 | * netdev_drivername - network driver for the device | |
9165 | * @dev: network device | |
f0db275a SH |
9166 | * |
9167 | * Determine network driver for device. | |
9168 | */ | |
3019de12 | 9169 | const char *netdev_drivername(const struct net_device *dev) |
6579e57b | 9170 | { |
cf04a4c7 SH |
9171 | const struct device_driver *driver; |
9172 | const struct device *parent; | |
3019de12 | 9173 | const char *empty = ""; |
6579e57b AV |
9174 | |
9175 | parent = dev->dev.parent; | |
6579e57b | 9176 | if (!parent) |
3019de12 | 9177 | return empty; |
6579e57b AV |
9178 | |
9179 | driver = parent->driver; | |
9180 | if (driver && driver->name) | |
3019de12 DM |
9181 | return driver->name; |
9182 | return empty; | |
6579e57b AV |
9183 | } |
9184 | ||
6ea754eb JP |
9185 | static void __netdev_printk(const char *level, const struct net_device *dev, |
9186 | struct va_format *vaf) | |
256df2f3 | 9187 | { |
b004ff49 | 9188 | if (dev && dev->dev.parent) { |
6ea754eb JP |
9189 | dev_printk_emit(level[1] - '0', |
9190 | dev->dev.parent, | |
9191 | "%s %s %s%s: %pV", | |
9192 | dev_driver_string(dev->dev.parent), | |
9193 | dev_name(dev->dev.parent), | |
9194 | netdev_name(dev), netdev_reg_state(dev), | |
9195 | vaf); | |
b004ff49 | 9196 | } else if (dev) { |
6ea754eb JP |
9197 | printk("%s%s%s: %pV", |
9198 | level, netdev_name(dev), netdev_reg_state(dev), vaf); | |
b004ff49 | 9199 | } else { |
6ea754eb | 9200 | printk("%s(NULL net_device): %pV", level, vaf); |
b004ff49 | 9201 | } |
256df2f3 JP |
9202 | } |
9203 | ||
6ea754eb JP |
9204 | void netdev_printk(const char *level, const struct net_device *dev, |
9205 | const char *format, ...) | |
256df2f3 JP |
9206 | { |
9207 | struct va_format vaf; | |
9208 | va_list args; | |
256df2f3 JP |
9209 | |
9210 | va_start(args, format); | |
9211 | ||
9212 | vaf.fmt = format; | |
9213 | vaf.va = &args; | |
9214 | ||
6ea754eb | 9215 | __netdev_printk(level, dev, &vaf); |
b004ff49 | 9216 | |
256df2f3 | 9217 | va_end(args); |
256df2f3 JP |
9218 | } |
9219 | EXPORT_SYMBOL(netdev_printk); | |
9220 | ||
9221 | #define define_netdev_printk_level(func, level) \ | |
6ea754eb | 9222 | void func(const struct net_device *dev, const char *fmt, ...) \ |
256df2f3 | 9223 | { \ |
256df2f3 JP |
9224 | struct va_format vaf; \ |
9225 | va_list args; \ | |
9226 | \ | |
9227 | va_start(args, fmt); \ | |
9228 | \ | |
9229 | vaf.fmt = fmt; \ | |
9230 | vaf.va = &args; \ | |
9231 | \ | |
6ea754eb | 9232 | __netdev_printk(level, dev, &vaf); \ |
b004ff49 | 9233 | \ |
256df2f3 | 9234 | va_end(args); \ |
256df2f3 JP |
9235 | } \ |
9236 | EXPORT_SYMBOL(func); | |
9237 | ||
9238 | define_netdev_printk_level(netdev_emerg, KERN_EMERG); | |
9239 | define_netdev_printk_level(netdev_alert, KERN_ALERT); | |
9240 | define_netdev_printk_level(netdev_crit, KERN_CRIT); | |
9241 | define_netdev_printk_level(netdev_err, KERN_ERR); | |
9242 | define_netdev_printk_level(netdev_warn, KERN_WARNING); | |
9243 | define_netdev_printk_level(netdev_notice, KERN_NOTICE); | |
9244 | define_netdev_printk_level(netdev_info, KERN_INFO); | |
9245 | ||
4665079c | 9246 | static void __net_exit netdev_exit(struct net *net) |
881d966b EB |
9247 | { |
9248 | kfree(net->dev_name_head); | |
9249 | kfree(net->dev_index_head); | |
ee21b18b VA |
9250 | if (net != &init_net) |
9251 | WARN_ON_ONCE(!list_empty(&net->dev_base_head)); | |
881d966b EB |
9252 | } |
9253 | ||
022cbae6 | 9254 | static struct pernet_operations __net_initdata netdev_net_ops = { |
881d966b EB |
9255 | .init = netdev_init, |
9256 | .exit = netdev_exit, | |
9257 | }; | |
9258 | ||
4665079c | 9259 | static void __net_exit default_device_exit(struct net *net) |
ce286d32 | 9260 | { |
e008b5fc | 9261 | struct net_device *dev, *aux; |
ce286d32 | 9262 | /* |
e008b5fc | 9263 | * Push all migratable network devices back to the |
ce286d32 EB |
9264 | * initial network namespace |
9265 | */ | |
9266 | rtnl_lock(); | |
e008b5fc | 9267 | for_each_netdev_safe(net, dev, aux) { |
ce286d32 | 9268 | int err; |
aca51397 | 9269 | char fb_name[IFNAMSIZ]; |
ce286d32 EB |
9270 | |
9271 | /* Ignore unmoveable devices (i.e. loopback) */ | |
9272 | if (dev->features & NETIF_F_NETNS_LOCAL) | |
9273 | continue; | |
9274 | ||
e008b5fc EB |
9275 | /* Leave virtual devices for the generic cleanup */ |
9276 | if (dev->rtnl_link_ops) | |
9277 | continue; | |
d0c082ce | 9278 | |
25985edc | 9279 | /* Push remaining network devices to init_net */ |
aca51397 PE |
9280 | snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex); |
9281 | err = dev_change_net_namespace(dev, &init_net, fb_name); | |
ce286d32 | 9282 | if (err) { |
7b6cd1ce JP |
9283 | pr_emerg("%s: failed to move %s to init_net: %d\n", |
9284 | __func__, dev->name, err); | |
aca51397 | 9285 | BUG(); |
ce286d32 EB |
9286 | } |
9287 | } | |
9288 | rtnl_unlock(); | |
9289 | } | |
9290 | ||
50624c93 EB |
9291 | static void __net_exit rtnl_lock_unregistering(struct list_head *net_list) |
9292 | { | |
9293 | /* Return with the rtnl_lock held when there are no network | |
9294 | * devices unregistering in any network namespace in net_list. | |
9295 | */ | |
9296 | struct net *net; | |
9297 | bool unregistering; | |
ff960a73 | 9298 | DEFINE_WAIT_FUNC(wait, woken_wake_function); |
50624c93 | 9299 | |
ff960a73 | 9300 | add_wait_queue(&netdev_unregistering_wq, &wait); |
50624c93 | 9301 | for (;;) { |
50624c93 EB |
9302 | unregistering = false; |
9303 | rtnl_lock(); | |
9304 | list_for_each_entry(net, net_list, exit_list) { | |
9305 | if (net->dev_unreg_count > 0) { | |
9306 | unregistering = true; | |
9307 | break; | |
9308 | } | |
9309 | } | |
9310 | if (!unregistering) | |
9311 | break; | |
9312 | __rtnl_unlock(); | |
ff960a73 PZ |
9313 | |
9314 | wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT); | |
50624c93 | 9315 | } |
ff960a73 | 9316 | remove_wait_queue(&netdev_unregistering_wq, &wait); |
50624c93 EB |
9317 | } |
9318 | ||
04dc7f6b EB |
9319 | static void __net_exit default_device_exit_batch(struct list_head *net_list) |
9320 | { | |
9321 | /* At exit all network devices most be removed from a network | |
b595076a | 9322 | * namespace. Do this in the reverse order of registration. |
04dc7f6b EB |
9323 | * Do this across as many network namespaces as possible to |
9324 | * improve batching efficiency. | |
9325 | */ | |
9326 | struct net_device *dev; | |
9327 | struct net *net; | |
9328 | LIST_HEAD(dev_kill_list); | |
9329 | ||
50624c93 EB |
9330 | /* To prevent network device cleanup code from dereferencing |
9331 | * loopback devices or network devices that have been freed | |
9332 | * wait here for all pending unregistrations to complete, | |
9333 | * before unregistring the loopback device and allowing the | |
9334 | * network namespace be freed. | |
9335 | * | |
9336 | * The netdev todo list containing all network devices | |
9337 | * unregistrations that happen in default_device_exit_batch | |
9338 | * will run in the rtnl_unlock() at the end of | |
9339 | * default_device_exit_batch. | |
9340 | */ | |
9341 | rtnl_lock_unregistering(net_list); | |
04dc7f6b EB |
9342 | list_for_each_entry(net, net_list, exit_list) { |
9343 | for_each_netdev_reverse(net, dev) { | |
b0ab2fab | 9344 | if (dev->rtnl_link_ops && dev->rtnl_link_ops->dellink) |
04dc7f6b EB |
9345 | dev->rtnl_link_ops->dellink(dev, &dev_kill_list); |
9346 | else | |
9347 | unregister_netdevice_queue(dev, &dev_kill_list); | |
9348 | } | |
9349 | } | |
9350 | unregister_netdevice_many(&dev_kill_list); | |
9351 | rtnl_unlock(); | |
9352 | } | |
9353 | ||
022cbae6 | 9354 | static struct pernet_operations __net_initdata default_device_ops = { |
ce286d32 | 9355 | .exit = default_device_exit, |
04dc7f6b | 9356 | .exit_batch = default_device_exit_batch, |
ce286d32 EB |
9357 | }; |
9358 | ||
1da177e4 LT |
9359 | /* |
9360 | * Initialize the DEV module. At boot time this walks the device list and | |
9361 | * unhooks any devices that fail to initialise (normally hardware not | |
9362 | * present) and leaves us with a valid list of present and active devices. | |
9363 | * | |
9364 | */ | |
9365 | ||
9366 | /* | |
9367 | * This is called single threaded during boot, so no need | |
9368 | * to take the rtnl semaphore. | |
9369 | */ | |
9370 | static int __init net_dev_init(void) | |
9371 | { | |
9372 | int i, rc = -ENOMEM; | |
9373 | ||
9374 | BUG_ON(!dev_boot_phase); | |
9375 | ||
1da177e4 LT |
9376 | if (dev_proc_init()) |
9377 | goto out; | |
9378 | ||
8b41d188 | 9379 | if (netdev_kobject_init()) |
1da177e4 LT |
9380 | goto out; |
9381 | ||
9382 | INIT_LIST_HEAD(&ptype_all); | |
82d8a867 | 9383 | for (i = 0; i < PTYPE_HASH_SIZE; i++) |
1da177e4 LT |
9384 | INIT_LIST_HEAD(&ptype_base[i]); |
9385 | ||
62532da9 VY |
9386 | INIT_LIST_HEAD(&offload_base); |
9387 | ||
881d966b EB |
9388 | if (register_pernet_subsys(&netdev_net_ops)) |
9389 | goto out; | |
1da177e4 LT |
9390 | |
9391 | /* | |
9392 | * Initialise the packet receive queues. | |
9393 | */ | |
9394 | ||
6f912042 | 9395 | for_each_possible_cpu(i) { |
41852497 | 9396 | struct work_struct *flush = per_cpu_ptr(&flush_works, i); |
e36fa2f7 | 9397 | struct softnet_data *sd = &per_cpu(softnet_data, i); |
1da177e4 | 9398 | |
41852497 ED |
9399 | INIT_WORK(flush, flush_backlog); |
9400 | ||
e36fa2f7 | 9401 | skb_queue_head_init(&sd->input_pkt_queue); |
6e7676c1 | 9402 | skb_queue_head_init(&sd->process_queue); |
f53c7239 SK |
9403 | #ifdef CONFIG_XFRM_OFFLOAD |
9404 | skb_queue_head_init(&sd->xfrm_backlog); | |
9405 | #endif | |
e36fa2f7 | 9406 | INIT_LIST_HEAD(&sd->poll_list); |
a9cbd588 | 9407 | sd->output_queue_tailp = &sd->output_queue; |
df334545 | 9408 | #ifdef CONFIG_RPS |
e36fa2f7 ED |
9409 | sd->csd.func = rps_trigger_softirq; |
9410 | sd->csd.info = sd; | |
e36fa2f7 | 9411 | sd->cpu = i; |
1e94d72f | 9412 | #endif |
0a9627f2 | 9413 | |
e36fa2f7 ED |
9414 | sd->backlog.poll = process_backlog; |
9415 | sd->backlog.weight = weight_p; | |
1da177e4 LT |
9416 | } |
9417 | ||
1da177e4 LT |
9418 | dev_boot_phase = 0; |
9419 | ||
505d4f73 EB |
9420 | /* The loopback device is special if any other network devices |
9421 | * is present in a network namespace the loopback device must | |
9422 | * be present. Since we now dynamically allocate and free the | |
9423 | * loopback device ensure this invariant is maintained by | |
9424 | * keeping the loopback device as the first device on the | |
9425 | * list of network devices. Ensuring the loopback devices | |
9426 | * is the first device that appears and the last network device | |
9427 | * that disappears. | |
9428 | */ | |
9429 | if (register_pernet_device(&loopback_net_ops)) | |
9430 | goto out; | |
9431 | ||
9432 | if (register_pernet_device(&default_device_ops)) | |
9433 | goto out; | |
9434 | ||
962cf36c CM |
9435 | open_softirq(NET_TX_SOFTIRQ, net_tx_action); |
9436 | open_softirq(NET_RX_SOFTIRQ, net_rx_action); | |
1da177e4 | 9437 | |
f0bf90de SAS |
9438 | rc = cpuhp_setup_state_nocalls(CPUHP_NET_DEV_DEAD, "net/dev:dead", |
9439 | NULL, dev_cpu_dead); | |
9440 | WARN_ON(rc < 0); | |
1da177e4 LT |
9441 | rc = 0; |
9442 | out: | |
9443 | return rc; | |
9444 | } | |
9445 | ||
9446 | subsys_initcall(net_dev_init); |