2 * NET3 Protocol independent device support routines.
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.
9 * Derived from the non IP parts of dev.c 1.0.19
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Mark Evans, <evansmp@uhura.aston.ac.uk>
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>
23 * D.J. Barrow : Fixed bug where dev->refcnt gets set
24 * to 2 if register_netdev gets called
25 * before net_dev_init & also removed a
26 * few lines of code in the process.
27 * Alan Cox : device private ioctl copies fields back.
28 * Alan Cox : Transmit queue code does relevant
29 * stunts to keep the queue safe.
30 * Alan Cox : Fixed double lock.
31 * Alan Cox : Fixed promisc NULL pointer trap
32 * ???????? : Support the full private ioctl range
33 * Alan Cox : Moved ioctl permission check into
35 * Tim Kordas : SIOCADDMULTI/SIOCDELMULTI
36 * Alan Cox : 100 backlog just doesn't cut it when
37 * you start doing multicast video 8)
38 * Alan Cox : Rewrote net_bh and list manager.
39 * Alan Cox : Fix ETH_P_ALL echoback lengths.
40 * Alan Cox : Took out transmit every packet pass
41 * Saved a few bytes in the ioctl handler
42 * Alan Cox : Network driver sets packet type before
43 * calling netif_rx. Saves a function
45 * Alan Cox : Hashed net_bh()
46 * Richard Kooijman: Timestamp fixes.
47 * Alan Cox : Wrong field in SIOCGIFDSTADDR
48 * Alan Cox : Device lock protection.
49 * Alan Cox : Fixed nasty side effect of device close
51 * Rudi Cilibrasi : Pass the right thing to
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
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
67 * Paul Rusty Russell : SIOCSIFNAME
68 * Pekka Riikonen : Netdev boot-time settings code
69 * Andrew Morton : Make unregister_netdevice wait
70 * indefinitely on dev->refcnt
71 * J Hadi Salim : - Backlog queue sampling
72 * - netif_rx() feedback
75 #include <asm/uaccess.h>
76 #include <linux/bitops.h>
77 #include <linux/capability.h>
78 #include <linux/cpu.h>
79 #include <linux/types.h>
80 #include <linux/kernel.h>
81 #include <linux/hash.h>
82 #include <linux/slab.h>
83 #include <linux/sched.h>
84 #include <linux/mutex.h>
85 #include <linux/string.h>
87 #include <linux/socket.h>
88 #include <linux/sockios.h>
89 #include <linux/errno.h>
90 #include <linux/interrupt.h>
91 #include <linux/if_ether.h>
92 #include <linux/netdevice.h>
93 #include <linux/etherdevice.h>
94 #include <linux/ethtool.h>
95 #include <linux/notifier.h>
96 #include <linux/skbuff.h>
97 #include <net/net_namespace.h>
99 #include <net/busy_poll.h>
100 #include <linux/rtnetlink.h>
101 #include <linux/stat.h>
103 #include <net/dst_metadata.h>
104 #include <net/pkt_sched.h>
105 #include <net/checksum.h>
106 #include <net/xfrm.h>
107 #include <linux/highmem.h>
108 #include <linux/init.h>
109 #include <linux/module.h>
110 #include <linux/netpoll.h>
111 #include <linux/rcupdate.h>
112 #include <linux/delay.h>
113 #include <net/iw_handler.h>
114 #include <asm/current.h>
115 #include <linux/audit.h>
116 #include <linux/dmaengine.h>
117 #include <linux/err.h>
118 #include <linux/ctype.h>
119 #include <linux/if_arp.h>
120 #include <linux/if_vlan.h>
121 #include <linux/ip.h>
123 #include <net/mpls.h>
124 #include <linux/ipv6.h>
125 #include <linux/in.h>
126 #include <linux/jhash.h>
127 #include <linux/random.h>
128 #include <trace/events/napi.h>
129 #include <trace/events/net.h>
130 #include <trace/events/skb.h>
131 #include <linux/pci.h>
132 #include <linux/inetdevice.h>
133 #include <linux/cpu_rmap.h>
134 #include <linux/static_key.h>
135 #include <linux/hashtable.h>
136 #include <linux/vmalloc.h>
137 #include <linux/if_macvlan.h>
138 #include <linux/errqueue.h>
139 #include <linux/hrtimer.h>
140 #include <linux/netfilter_ingress.h>
141 #include <linux/sctp.h>
142 #include <linux/crash_dump.h>
144 #include "net-sysfs.h"
146 /* Instead of increasing this, you should create a hash table. */
147 #define MAX_GRO_SKBS 8
149 /* This should be increased if a protocol with a bigger head is added. */
150 #define GRO_MAX_HEAD (MAX_HEADER + 128)
152 static DEFINE_SPINLOCK(ptype_lock);
153 static DEFINE_SPINLOCK(offload_lock);
154 struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
155 struct list_head ptype_all __read_mostly; /* Taps */
156 static struct list_head offload_base __read_mostly;
158 static int netif_rx_internal(struct sk_buff *skb);
159 static int call_netdevice_notifiers_info(unsigned long val,
160 struct net_device *dev,
161 struct netdev_notifier_info *info);
164 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
167 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
169 * Writers must hold the rtnl semaphore while they loop through the
170 * dev_base_head list, and hold dev_base_lock for writing when they do the
171 * actual updates. This allows pure readers to access the list even
172 * while a writer is preparing to update it.
174 * To put it another way, dev_base_lock is held for writing only to
175 * protect against pure readers; the rtnl semaphore provides the
176 * protection against other writers.
178 * See, for example usages, register_netdevice() and
179 * unregister_netdevice(), which must be called with the rtnl
182 DEFINE_RWLOCK(dev_base_lock);
183 EXPORT_SYMBOL(dev_base_lock);
185 /* protects napi_hash addition/deletion and napi_gen_id */
186 static DEFINE_SPINLOCK(napi_hash_lock);
188 static unsigned int napi_gen_id = NR_CPUS;
189 static DEFINE_READ_MOSTLY_HASHTABLE(napi_hash, 8);
191 static seqcount_t devnet_rename_seq;
193 static inline void dev_base_seq_inc(struct net *net)
195 while (++net->dev_base_seq == 0);
198 static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
200 unsigned int hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
202 return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)];
205 static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
207 return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)];
210 static inline void rps_lock(struct softnet_data *sd)
213 spin_lock(&sd->input_pkt_queue.lock);
217 static inline void rps_unlock(struct softnet_data *sd)
220 spin_unlock(&sd->input_pkt_queue.lock);
224 /* Device list insertion */
225 static void list_netdevice(struct net_device *dev)
227 struct net *net = dev_net(dev);
231 write_lock_bh(&dev_base_lock);
232 list_add_tail_rcu(&dev->dev_list, &net->dev_base_head);
233 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
234 hlist_add_head_rcu(&dev->index_hlist,
235 dev_index_hash(net, dev->ifindex));
236 write_unlock_bh(&dev_base_lock);
238 dev_base_seq_inc(net);
241 /* Device list removal
242 * caller must respect a RCU grace period before freeing/reusing dev
244 static void unlist_netdevice(struct net_device *dev)
248 /* Unlink dev from the device chain */
249 write_lock_bh(&dev_base_lock);
250 list_del_rcu(&dev->dev_list);
251 hlist_del_rcu(&dev->name_hlist);
252 hlist_del_rcu(&dev->index_hlist);
253 write_unlock_bh(&dev_base_lock);
255 dev_base_seq_inc(dev_net(dev));
262 static RAW_NOTIFIER_HEAD(netdev_chain);
265 * Device drivers call our routines to queue packets here. We empty the
266 * queue in the local softnet handler.
269 DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
270 EXPORT_PER_CPU_SYMBOL(softnet_data);
272 #ifdef CONFIG_LOCKDEP
274 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
275 * according to dev->type
277 static const unsigned short netdev_lock_type[] =
278 {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
279 ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
280 ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
281 ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
282 ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
283 ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
284 ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
285 ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
286 ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
287 ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
288 ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
289 ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
290 ARPHRD_FCFABRIC, ARPHRD_IEEE80211, ARPHRD_IEEE80211_PRISM,
291 ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET, ARPHRD_PHONET_PIPE,
292 ARPHRD_IEEE802154, ARPHRD_VOID, ARPHRD_NONE};
294 static const char *const netdev_lock_name[] =
295 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
296 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
297 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
298 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
299 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
300 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
301 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
302 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
303 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
304 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
305 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
306 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
307 "_xmit_FCFABRIC", "_xmit_IEEE80211", "_xmit_IEEE80211_PRISM",
308 "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", "_xmit_PHONET_PIPE",
309 "_xmit_IEEE802154", "_xmit_VOID", "_xmit_NONE"};
311 static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
312 static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)];
314 static inline unsigned short netdev_lock_pos(unsigned short dev_type)
318 for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++)
319 if (netdev_lock_type[i] == dev_type)
321 /* the last key is used by default */
322 return ARRAY_SIZE(netdev_lock_type) - 1;
325 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
326 unsigned short dev_type)
330 i = netdev_lock_pos(dev_type);
331 lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
332 netdev_lock_name[i]);
335 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
339 i = netdev_lock_pos(dev->type);
340 lockdep_set_class_and_name(&dev->addr_list_lock,
341 &netdev_addr_lock_key[i],
342 netdev_lock_name[i]);
345 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
346 unsigned short dev_type)
349 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
354 /*******************************************************************************
356 Protocol management and registration routines
358 *******************************************************************************/
361 * Add a protocol ID to the list. Now that the input handler is
362 * smarter we can dispense with all the messy stuff that used to be
365 * BEWARE!!! Protocol handlers, mangling input packets,
366 * MUST BE last in hash buckets and checking protocol handlers
367 * MUST start from promiscuous ptype_all chain in net_bh.
368 * It is true now, do not change it.
369 * Explanation follows: if protocol handler, mangling packet, will
370 * be the first on list, it is not able to sense, that packet
371 * is cloned and should be copied-on-write, so that it will
372 * change it and subsequent readers will get broken packet.
376 static inline struct list_head *ptype_head(const struct packet_type *pt)
378 if (pt->type == htons(ETH_P_ALL))
379 return pt->dev ? &pt->dev->ptype_all : &ptype_all;
381 return pt->dev ? &pt->dev->ptype_specific :
382 &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
386 * dev_add_pack - add packet handler
387 * @pt: packet type declaration
389 * Add a protocol handler to the networking stack. The passed &packet_type
390 * is linked into kernel lists and may not be freed until it has been
391 * removed from the kernel lists.
393 * This call does not sleep therefore it can not
394 * guarantee all CPU's that are in middle of receiving packets
395 * will see the new packet type (until the next received packet).
398 void dev_add_pack(struct packet_type *pt)
400 struct list_head *head = ptype_head(pt);
402 spin_lock(&ptype_lock);
403 list_add_rcu(&pt->list, head);
404 spin_unlock(&ptype_lock);
406 EXPORT_SYMBOL(dev_add_pack);
409 * __dev_remove_pack - remove packet handler
410 * @pt: packet type declaration
412 * Remove a protocol handler that was previously added to the kernel
413 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
414 * from the kernel lists and can be freed or reused once this function
417 * The packet type might still be in use by receivers
418 * and must not be freed until after all the CPU's have gone
419 * through a quiescent state.
421 void __dev_remove_pack(struct packet_type *pt)
423 struct list_head *head = ptype_head(pt);
424 struct packet_type *pt1;
426 spin_lock(&ptype_lock);
428 list_for_each_entry(pt1, head, list) {
430 list_del_rcu(&pt->list);
435 pr_warn("dev_remove_pack: %p not found\n", pt);
437 spin_unlock(&ptype_lock);
439 EXPORT_SYMBOL(__dev_remove_pack);
442 * dev_remove_pack - remove packet handler
443 * @pt: packet type declaration
445 * Remove a protocol handler that was previously added to the kernel
446 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
447 * from the kernel lists and can be freed or reused once this function
450 * This call sleeps to guarantee that no CPU is looking at the packet
453 void dev_remove_pack(struct packet_type *pt)
455 __dev_remove_pack(pt);
459 EXPORT_SYMBOL(dev_remove_pack);
463 * dev_add_offload - register offload handlers
464 * @po: protocol offload declaration
466 * Add protocol offload handlers to the networking stack. The passed
467 * &proto_offload is linked into kernel lists and may not be freed until
468 * it has been removed from the kernel lists.
470 * This call does not sleep therefore it can not
471 * guarantee all CPU's that are in middle of receiving packets
472 * will see the new offload handlers (until the next received packet).
474 void dev_add_offload(struct packet_offload *po)
476 struct packet_offload *elem;
478 spin_lock(&offload_lock);
479 list_for_each_entry(elem, &offload_base, list) {
480 if (po->priority < elem->priority)
483 list_add_rcu(&po->list, elem->list.prev);
484 spin_unlock(&offload_lock);
486 EXPORT_SYMBOL(dev_add_offload);
489 * __dev_remove_offload - remove offload handler
490 * @po: packet offload declaration
492 * Remove a protocol offload handler that was previously added to the
493 * kernel offload handlers by dev_add_offload(). The passed &offload_type
494 * is removed from the kernel lists and can be freed or reused once this
497 * The packet type might still be in use by receivers
498 * and must not be freed until after all the CPU's have gone
499 * through a quiescent state.
501 static void __dev_remove_offload(struct packet_offload *po)
503 struct list_head *head = &offload_base;
504 struct packet_offload *po1;
506 spin_lock(&offload_lock);
508 list_for_each_entry(po1, head, list) {
510 list_del_rcu(&po->list);
515 pr_warn("dev_remove_offload: %p not found\n", po);
517 spin_unlock(&offload_lock);
521 * dev_remove_offload - remove packet offload handler
522 * @po: packet offload declaration
524 * Remove a packet offload handler that was previously added to the kernel
525 * offload handlers by dev_add_offload(). The passed &offload_type is
526 * removed from the kernel lists and can be freed or reused once this
529 * This call sleeps to guarantee that no CPU is looking at the packet
532 void dev_remove_offload(struct packet_offload *po)
534 __dev_remove_offload(po);
538 EXPORT_SYMBOL(dev_remove_offload);
540 /******************************************************************************
542 Device Boot-time Settings Routines
544 *******************************************************************************/
546 /* Boot time configuration table */
547 static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
550 * netdev_boot_setup_add - add new setup entry
551 * @name: name of the device
552 * @map: configured settings for the device
554 * Adds new setup entry to the dev_boot_setup list. The function
555 * returns 0 on error and 1 on success. This is a generic routine to
558 static int netdev_boot_setup_add(char *name, struct ifmap *map)
560 struct netdev_boot_setup *s;
564 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
565 if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
566 memset(s[i].name, 0, sizeof(s[i].name));
567 strlcpy(s[i].name, name, IFNAMSIZ);
568 memcpy(&s[i].map, map, sizeof(s[i].map));
573 return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
577 * netdev_boot_setup_check - check boot time settings
578 * @dev: the netdevice
580 * Check boot time settings for the device.
581 * The found settings are set for the device to be used
582 * later in the device probing.
583 * Returns 0 if no settings found, 1 if they are.
585 int netdev_boot_setup_check(struct net_device *dev)
587 struct netdev_boot_setup *s = dev_boot_setup;
590 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
591 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
592 !strcmp(dev->name, s[i].name)) {
593 dev->irq = s[i].map.irq;
594 dev->base_addr = s[i].map.base_addr;
595 dev->mem_start = s[i].map.mem_start;
596 dev->mem_end = s[i].map.mem_end;
602 EXPORT_SYMBOL(netdev_boot_setup_check);
606 * netdev_boot_base - get address from boot time settings
607 * @prefix: prefix for network device
608 * @unit: id for network device
610 * Check boot time settings for the base address of device.
611 * The found settings are set for the device to be used
612 * later in the device probing.
613 * Returns 0 if no settings found.
615 unsigned long netdev_boot_base(const char *prefix, int unit)
617 const struct netdev_boot_setup *s = dev_boot_setup;
621 sprintf(name, "%s%d", prefix, unit);
624 * If device already registered then return base of 1
625 * to indicate not to probe for this interface
627 if (__dev_get_by_name(&init_net, name))
630 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
631 if (!strcmp(name, s[i].name))
632 return s[i].map.base_addr;
637 * Saves at boot time configured settings for any netdevice.
639 int __init netdev_boot_setup(char *str)
644 str = get_options(str, ARRAY_SIZE(ints), ints);
649 memset(&map, 0, sizeof(map));
653 map.base_addr = ints[2];
655 map.mem_start = ints[3];
657 map.mem_end = ints[4];
659 /* Add new entry to the list */
660 return netdev_boot_setup_add(str, &map);
663 __setup("netdev=", netdev_boot_setup);
665 /*******************************************************************************
667 Device Interface Subroutines
669 *******************************************************************************/
672 * dev_get_iflink - get 'iflink' value of a interface
673 * @dev: targeted interface
675 * Indicates the ifindex the interface is linked to.
676 * Physical interfaces have the same 'ifindex' and 'iflink' values.
679 int dev_get_iflink(const struct net_device *dev)
681 if (dev->netdev_ops && dev->netdev_ops->ndo_get_iflink)
682 return dev->netdev_ops->ndo_get_iflink(dev);
686 EXPORT_SYMBOL(dev_get_iflink);
689 * dev_fill_metadata_dst - Retrieve tunnel egress information.
690 * @dev: targeted interface
693 * For better visibility of tunnel traffic OVS needs to retrieve
694 * egress tunnel information for a packet. Following API allows
695 * user to get this info.
697 int dev_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
699 struct ip_tunnel_info *info;
701 if (!dev->netdev_ops || !dev->netdev_ops->ndo_fill_metadata_dst)
704 info = skb_tunnel_info_unclone(skb);
707 if (unlikely(!(info->mode & IP_TUNNEL_INFO_TX)))
710 return dev->netdev_ops->ndo_fill_metadata_dst(dev, skb);
712 EXPORT_SYMBOL_GPL(dev_fill_metadata_dst);
715 * __dev_get_by_name - find a device by its name
716 * @net: the applicable net namespace
717 * @name: name to find
719 * Find an interface by name. Must be called under RTNL semaphore
720 * or @dev_base_lock. If the name is found a pointer to the device
721 * is returned. If the name is not found then %NULL is returned. The
722 * reference counters are not incremented so the caller must be
723 * careful with locks.
726 struct net_device *__dev_get_by_name(struct net *net, const char *name)
728 struct net_device *dev;
729 struct hlist_head *head = dev_name_hash(net, name);
731 hlist_for_each_entry(dev, head, name_hlist)
732 if (!strncmp(dev->name, name, IFNAMSIZ))
737 EXPORT_SYMBOL(__dev_get_by_name);
740 * dev_get_by_name_rcu - find a device by its name
741 * @net: the applicable net namespace
742 * @name: name to find
744 * Find an interface by name.
745 * If the name is found a pointer to the device is returned.
746 * If the name is not found then %NULL is returned.
747 * The reference counters are not incremented so the caller must be
748 * careful with locks. The caller must hold RCU lock.
751 struct net_device *dev_get_by_name_rcu(struct net *net, const char *name)
753 struct net_device *dev;
754 struct hlist_head *head = dev_name_hash(net, name);
756 hlist_for_each_entry_rcu(dev, head, name_hlist)
757 if (!strncmp(dev->name, name, IFNAMSIZ))
762 EXPORT_SYMBOL(dev_get_by_name_rcu);
765 * dev_get_by_name - find a device by its name
766 * @net: the applicable net namespace
767 * @name: name to find
769 * Find an interface by name. This can be called from any
770 * context and does its own locking. The returned handle has
771 * the usage count incremented and the caller must use dev_put() to
772 * release it when it is no longer needed. %NULL is returned if no
773 * matching device is found.
776 struct net_device *dev_get_by_name(struct net *net, const char *name)
778 struct net_device *dev;
781 dev = dev_get_by_name_rcu(net, name);
787 EXPORT_SYMBOL(dev_get_by_name);
790 * __dev_get_by_index - find a device by its ifindex
791 * @net: the applicable net namespace
792 * @ifindex: index of device
794 * Search for an interface by index. Returns %NULL if the device
795 * is not found or a pointer to the device. The device has not
796 * had its reference counter increased so the caller must be careful
797 * about locking. The caller must hold either the RTNL semaphore
801 struct net_device *__dev_get_by_index(struct net *net, int ifindex)
803 struct net_device *dev;
804 struct hlist_head *head = dev_index_hash(net, ifindex);
806 hlist_for_each_entry(dev, head, index_hlist)
807 if (dev->ifindex == ifindex)
812 EXPORT_SYMBOL(__dev_get_by_index);
815 * dev_get_by_index_rcu - find a device by its ifindex
816 * @net: the applicable net namespace
817 * @ifindex: index of device
819 * Search for an interface by index. Returns %NULL if the device
820 * is not found or a pointer to the device. The device has not
821 * had its reference counter increased so the caller must be careful
822 * about locking. The caller must hold RCU lock.
825 struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex)
827 struct net_device *dev;
828 struct hlist_head *head = dev_index_hash(net, ifindex);
830 hlist_for_each_entry_rcu(dev, head, index_hlist)
831 if (dev->ifindex == ifindex)
836 EXPORT_SYMBOL(dev_get_by_index_rcu);
840 * dev_get_by_index - find a device by its ifindex
841 * @net: the applicable net namespace
842 * @ifindex: index of device
844 * Search for an interface by index. Returns NULL if the device
845 * is not found or a pointer to the device. The device returned has
846 * had a reference added and the pointer is safe until the user calls
847 * dev_put to indicate they have finished with it.
850 struct net_device *dev_get_by_index(struct net *net, int ifindex)
852 struct net_device *dev;
855 dev = dev_get_by_index_rcu(net, ifindex);
861 EXPORT_SYMBOL(dev_get_by_index);
864 * netdev_get_name - get a netdevice name, knowing its ifindex.
865 * @net: network namespace
866 * @name: a pointer to the buffer where the name will be stored.
867 * @ifindex: the ifindex of the interface to get the name from.
869 * The use of raw_seqcount_begin() and cond_resched() before
870 * retrying is required as we want to give the writers a chance
871 * to complete when CONFIG_PREEMPT is not set.
873 int netdev_get_name(struct net *net, char *name, int ifindex)
875 struct net_device *dev;
879 seq = raw_seqcount_begin(&devnet_rename_seq);
881 dev = dev_get_by_index_rcu(net, ifindex);
887 strcpy(name, dev->name);
889 if (read_seqcount_retry(&devnet_rename_seq, seq)) {
898 * dev_getbyhwaddr_rcu - find a device by its hardware address
899 * @net: the applicable net namespace
900 * @type: media type of device
901 * @ha: hardware address
903 * Search for an interface by MAC address. Returns NULL if the device
904 * is not found or a pointer to the device.
905 * The caller must hold RCU or RTNL.
906 * The returned device has not had its ref count increased
907 * and the caller must therefore be careful about locking
911 struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
914 struct net_device *dev;
916 for_each_netdev_rcu(net, dev)
917 if (dev->type == type &&
918 !memcmp(dev->dev_addr, ha, dev->addr_len))
923 EXPORT_SYMBOL(dev_getbyhwaddr_rcu);
925 struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
927 struct net_device *dev;
930 for_each_netdev(net, dev)
931 if (dev->type == type)
936 EXPORT_SYMBOL(__dev_getfirstbyhwtype);
938 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
940 struct net_device *dev, *ret = NULL;
943 for_each_netdev_rcu(net, dev)
944 if (dev->type == type) {
952 EXPORT_SYMBOL(dev_getfirstbyhwtype);
955 * __dev_get_by_flags - find any device with given flags
956 * @net: the applicable net namespace
957 * @if_flags: IFF_* values
958 * @mask: bitmask of bits in if_flags to check
960 * Search for any interface with the given flags. Returns NULL if a device
961 * is not found or a pointer to the device. Must be called inside
962 * rtnl_lock(), and result refcount is unchanged.
965 struct net_device *__dev_get_by_flags(struct net *net, unsigned short if_flags,
968 struct net_device *dev, *ret;
973 for_each_netdev(net, dev) {
974 if (((dev->flags ^ if_flags) & mask) == 0) {
981 EXPORT_SYMBOL(__dev_get_by_flags);
984 * dev_valid_name - check if name is okay for network device
987 * Network device names need to be valid file names to
988 * to allow sysfs to work. We also disallow any kind of
991 bool dev_valid_name(const char *name)
995 if (strlen(name) >= IFNAMSIZ)
997 if (!strcmp(name, ".") || !strcmp(name, ".."))
1001 if (*name == '/' || *name == ':' || isspace(*name))
1007 EXPORT_SYMBOL(dev_valid_name);
1010 * __dev_alloc_name - allocate a name for a device
1011 * @net: network namespace to allocate the device name in
1012 * @name: name format string
1013 * @buf: scratch buffer and result name string
1015 * Passed a format string - eg "lt%d" it will try and find a suitable
1016 * id. It scans list of devices to build up a free map, then chooses
1017 * the first empty slot. The caller must hold the dev_base or rtnl lock
1018 * while allocating the name and adding the device in order to avoid
1020 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
1021 * Returns the number of the unit assigned or a negative errno code.
1024 static int __dev_alloc_name(struct net *net, const char *name, char *buf)
1028 const int max_netdevices = 8*PAGE_SIZE;
1029 unsigned long *inuse;
1030 struct net_device *d;
1032 p = strnchr(name, IFNAMSIZ-1, '%');
1035 * Verify the string as this thing may have come from
1036 * the user. There must be either one "%d" and no other "%"
1039 if (p[1] != 'd' || strchr(p + 2, '%'))
1042 /* Use one page as a bit array of possible slots */
1043 inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
1047 for_each_netdev(net, d) {
1048 if (!sscanf(d->name, name, &i))
1050 if (i < 0 || i >= max_netdevices)
1053 /* avoid cases where sscanf is not exact inverse of printf */
1054 snprintf(buf, IFNAMSIZ, name, i);
1055 if (!strncmp(buf, d->name, IFNAMSIZ))
1059 i = find_first_zero_bit(inuse, max_netdevices);
1060 free_page((unsigned long) inuse);
1064 snprintf(buf, IFNAMSIZ, name, i);
1065 if (!__dev_get_by_name(net, buf))
1068 /* It is possible to run out of possible slots
1069 * when the name is long and there isn't enough space left
1070 * for the digits, or if all bits are used.
1076 * dev_alloc_name - allocate a name for a device
1078 * @name: name format string
1080 * Passed a format string - eg "lt%d" it will try and find a suitable
1081 * id. It scans list of devices to build up a free map, then chooses
1082 * the first empty slot. The caller must hold the dev_base or rtnl lock
1083 * while allocating the name and adding the device in order to avoid
1085 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
1086 * Returns the number of the unit assigned or a negative errno code.
1089 int dev_alloc_name(struct net_device *dev, const char *name)
1095 BUG_ON(!dev_net(dev));
1097 ret = __dev_alloc_name(net, name, buf);
1099 strlcpy(dev->name, buf, IFNAMSIZ);
1102 EXPORT_SYMBOL(dev_alloc_name);
1104 static int dev_alloc_name_ns(struct net *net,
1105 struct net_device *dev,
1111 ret = __dev_alloc_name(net, name, buf);
1113 strlcpy(dev->name, buf, IFNAMSIZ);
1117 static int dev_get_valid_name(struct net *net,
1118 struct net_device *dev,
1123 if (!dev_valid_name(name))
1126 if (strchr(name, '%'))
1127 return dev_alloc_name_ns(net, dev, name);
1128 else if (__dev_get_by_name(net, name))
1130 else if (dev->name != name)
1131 strlcpy(dev->name, name, IFNAMSIZ);
1137 * dev_change_name - change name of a device
1139 * @newname: name (or format string) must be at least IFNAMSIZ
1141 * Change name of a device, can pass format strings "eth%d".
1144 int dev_change_name(struct net_device *dev, const char *newname)
1146 unsigned char old_assign_type;
1147 char oldname[IFNAMSIZ];
1153 BUG_ON(!dev_net(dev));
1156 if (dev->flags & IFF_UP)
1159 write_seqcount_begin(&devnet_rename_seq);
1161 if (strncmp(newname, dev->name, IFNAMSIZ) == 0) {
1162 write_seqcount_end(&devnet_rename_seq);
1166 memcpy(oldname, dev->name, IFNAMSIZ);
1168 err = dev_get_valid_name(net, dev, newname);
1170 write_seqcount_end(&devnet_rename_seq);
1174 if (oldname[0] && !strchr(oldname, '%'))
1175 netdev_info(dev, "renamed from %s\n", oldname);
1177 old_assign_type = dev->name_assign_type;
1178 dev->name_assign_type = NET_NAME_RENAMED;
1181 ret = device_rename(&dev->dev, dev->name);
1183 memcpy(dev->name, oldname, IFNAMSIZ);
1184 dev->name_assign_type = old_assign_type;
1185 write_seqcount_end(&devnet_rename_seq);
1189 write_seqcount_end(&devnet_rename_seq);
1191 netdev_adjacent_rename_links(dev, oldname);
1193 write_lock_bh(&dev_base_lock);
1194 hlist_del_rcu(&dev->name_hlist);
1195 write_unlock_bh(&dev_base_lock);
1199 write_lock_bh(&dev_base_lock);
1200 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
1201 write_unlock_bh(&dev_base_lock);
1203 ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
1204 ret = notifier_to_errno(ret);
1207 /* err >= 0 after dev_alloc_name() or stores the first errno */
1210 write_seqcount_begin(&devnet_rename_seq);
1211 memcpy(dev->name, oldname, IFNAMSIZ);
1212 memcpy(oldname, newname, IFNAMSIZ);
1213 dev->name_assign_type = old_assign_type;
1214 old_assign_type = NET_NAME_RENAMED;
1217 pr_err("%s: name change rollback failed: %d\n",
1226 * dev_set_alias - change ifalias of a device
1228 * @alias: name up to IFALIASZ
1229 * @len: limit of bytes to copy from info
1231 * Set ifalias for a device,
1233 int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
1239 if (len >= IFALIASZ)
1243 kfree(dev->ifalias);
1244 dev->ifalias = NULL;
1248 new_ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL);
1251 dev->ifalias = new_ifalias;
1253 strlcpy(dev->ifalias, alias, len+1);
1259 * netdev_features_change - device changes features
1260 * @dev: device to cause notification
1262 * Called to indicate a device has changed features.
1264 void netdev_features_change(struct net_device *dev)
1266 call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
1268 EXPORT_SYMBOL(netdev_features_change);
1271 * netdev_state_change - device changes state
1272 * @dev: device to cause notification
1274 * Called to indicate a device has changed state. This function calls
1275 * the notifier chains for netdev_chain and sends a NEWLINK message
1276 * to the routing socket.
1278 void netdev_state_change(struct net_device *dev)
1280 if (dev->flags & IFF_UP) {
1281 struct netdev_notifier_change_info change_info;
1283 change_info.flags_changed = 0;
1284 call_netdevice_notifiers_info(NETDEV_CHANGE, dev,
1286 rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL);
1289 EXPORT_SYMBOL(netdev_state_change);
1292 * netdev_notify_peers - notify network peers about existence of @dev
1293 * @dev: network device
1295 * Generate traffic such that interested network peers are aware of
1296 * @dev, such as by generating a gratuitous ARP. This may be used when
1297 * a device wants to inform the rest of the network about some sort of
1298 * reconfiguration such as a failover event or virtual machine
1301 void netdev_notify_peers(struct net_device *dev)
1304 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, dev);
1307 EXPORT_SYMBOL(netdev_notify_peers);
1309 static int __dev_open(struct net_device *dev)
1311 const struct net_device_ops *ops = dev->netdev_ops;
1316 if (!netif_device_present(dev))
1319 /* Block netpoll from trying to do any rx path servicing.
1320 * If we don't do this there is a chance ndo_poll_controller
1321 * or ndo_poll may be running while we open the device
1323 netpoll_poll_disable(dev);
1325 ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev);
1326 ret = notifier_to_errno(ret);
1330 set_bit(__LINK_STATE_START, &dev->state);
1332 if (ops->ndo_validate_addr)
1333 ret = ops->ndo_validate_addr(dev);
1335 if (!ret && ops->ndo_open)
1336 ret = ops->ndo_open(dev);
1338 netpoll_poll_enable(dev);
1341 clear_bit(__LINK_STATE_START, &dev->state);
1343 dev->flags |= IFF_UP;
1344 dev_set_rx_mode(dev);
1346 add_device_randomness(dev->dev_addr, dev->addr_len);
1353 * dev_open - prepare an interface for use.
1354 * @dev: device to open
1356 * Takes a device from down to up state. The device's private open
1357 * function is invoked and then the multicast lists are loaded. Finally
1358 * the device is moved into the up state and a %NETDEV_UP message is
1359 * sent to the netdev notifier chain.
1361 * Calling this function on an active interface is a nop. On a failure
1362 * a negative errno code is returned.
1364 int dev_open(struct net_device *dev)
1368 if (dev->flags & IFF_UP)
1371 ret = __dev_open(dev);
1375 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING, GFP_KERNEL);
1376 call_netdevice_notifiers(NETDEV_UP, dev);
1380 EXPORT_SYMBOL(dev_open);
1382 static int __dev_close_many(struct list_head *head)
1384 struct net_device *dev;
1389 list_for_each_entry(dev, head, close_list) {
1390 /* Temporarily disable netpoll until the interface is down */
1391 netpoll_poll_disable(dev);
1393 call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
1395 clear_bit(__LINK_STATE_START, &dev->state);
1397 /* Synchronize to scheduled poll. We cannot touch poll list, it
1398 * can be even on different cpu. So just clear netif_running().
1400 * dev->stop() will invoke napi_disable() on all of it's
1401 * napi_struct instances on this device.
1403 smp_mb__after_atomic(); /* Commit netif_running(). */
1406 dev_deactivate_many(head);
1408 list_for_each_entry(dev, head, close_list) {
1409 const struct net_device_ops *ops = dev->netdev_ops;
1412 * Call the device specific close. This cannot fail.
1413 * Only if device is UP
1415 * We allow it to be called even after a DETACH hot-plug
1421 dev->flags &= ~IFF_UP;
1422 netpoll_poll_enable(dev);
1428 static int __dev_close(struct net_device *dev)
1433 list_add(&dev->close_list, &single);
1434 retval = __dev_close_many(&single);
1440 int dev_close_many(struct list_head *head, bool unlink)
1442 struct net_device *dev, *tmp;
1444 /* Remove the devices that don't need to be closed */
1445 list_for_each_entry_safe(dev, tmp, head, close_list)
1446 if (!(dev->flags & IFF_UP))
1447 list_del_init(&dev->close_list);
1449 __dev_close_many(head);
1451 list_for_each_entry_safe(dev, tmp, head, close_list) {
1452 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING, GFP_KERNEL);
1453 call_netdevice_notifiers(NETDEV_DOWN, dev);
1455 list_del_init(&dev->close_list);
1460 EXPORT_SYMBOL(dev_close_many);
1463 * dev_close - shutdown an interface.
1464 * @dev: device to shutdown
1466 * This function moves an active device into down state. A
1467 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1468 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1471 int dev_close(struct net_device *dev)
1473 if (dev->flags & IFF_UP) {
1476 list_add(&dev->close_list, &single);
1477 dev_close_many(&single, true);
1482 EXPORT_SYMBOL(dev_close);
1486 * dev_disable_lro - disable Large Receive Offload on a device
1489 * Disable Large Receive Offload (LRO) on a net device. Must be
1490 * called under RTNL. This is needed if received packets may be
1491 * forwarded to another interface.
1493 void dev_disable_lro(struct net_device *dev)
1495 struct net_device *lower_dev;
1496 struct list_head *iter;
1498 dev->wanted_features &= ~NETIF_F_LRO;
1499 netdev_update_features(dev);
1501 if (unlikely(dev->features & NETIF_F_LRO))
1502 netdev_WARN(dev, "failed to disable LRO!\n");
1504 netdev_for_each_lower_dev(dev, lower_dev, iter)
1505 dev_disable_lro(lower_dev);
1507 EXPORT_SYMBOL(dev_disable_lro);
1509 static int call_netdevice_notifier(struct notifier_block *nb, unsigned long val,
1510 struct net_device *dev)
1512 struct netdev_notifier_info info;
1514 netdev_notifier_info_init(&info, dev);
1515 return nb->notifier_call(nb, val, &info);
1518 static int dev_boot_phase = 1;
1521 * register_netdevice_notifier - register a network notifier block
1524 * Register a notifier to be called when network device events occur.
1525 * The notifier passed is linked into the kernel structures and must
1526 * not be reused until it has been unregistered. A negative errno code
1527 * is returned on a failure.
1529 * When registered all registration and up events are replayed
1530 * to the new notifier to allow device to have a race free
1531 * view of the network device list.
1534 int register_netdevice_notifier(struct notifier_block *nb)
1536 struct net_device *dev;
1537 struct net_device *last;
1542 err = raw_notifier_chain_register(&netdev_chain, nb);
1548 for_each_netdev(net, dev) {
1549 err = call_netdevice_notifier(nb, NETDEV_REGISTER, dev);
1550 err = notifier_to_errno(err);
1554 if (!(dev->flags & IFF_UP))
1557 call_netdevice_notifier(nb, NETDEV_UP, dev);
1568 for_each_netdev(net, dev) {
1572 if (dev->flags & IFF_UP) {
1573 call_netdevice_notifier(nb, NETDEV_GOING_DOWN,
1575 call_netdevice_notifier(nb, NETDEV_DOWN, dev);
1577 call_netdevice_notifier(nb, NETDEV_UNREGISTER, dev);
1582 raw_notifier_chain_unregister(&netdev_chain, nb);
1585 EXPORT_SYMBOL(register_netdevice_notifier);
1588 * unregister_netdevice_notifier - unregister a network notifier block
1591 * Unregister a notifier previously registered by
1592 * register_netdevice_notifier(). The notifier is unlinked into the
1593 * kernel structures and may then be reused. A negative errno code
1594 * is returned on a failure.
1596 * After unregistering unregister and down device events are synthesized
1597 * for all devices on the device list to the removed notifier to remove
1598 * the need for special case cleanup code.
1601 int unregister_netdevice_notifier(struct notifier_block *nb)
1603 struct net_device *dev;
1608 err = raw_notifier_chain_unregister(&netdev_chain, nb);
1613 for_each_netdev(net, dev) {
1614 if (dev->flags & IFF_UP) {
1615 call_netdevice_notifier(nb, NETDEV_GOING_DOWN,
1617 call_netdevice_notifier(nb, NETDEV_DOWN, dev);
1619 call_netdevice_notifier(nb, NETDEV_UNREGISTER, dev);
1626 EXPORT_SYMBOL(unregister_netdevice_notifier);
1629 * call_netdevice_notifiers_info - call all network notifier blocks
1630 * @val: value passed unmodified to notifier function
1631 * @dev: net_device pointer passed unmodified to notifier function
1632 * @info: notifier information data
1634 * Call all network notifier blocks. Parameters and return value
1635 * are as for raw_notifier_call_chain().
1638 static int call_netdevice_notifiers_info(unsigned long val,
1639 struct net_device *dev,
1640 struct netdev_notifier_info *info)
1643 netdev_notifier_info_init(info, dev);
1644 return raw_notifier_call_chain(&netdev_chain, val, info);
1648 * call_netdevice_notifiers - call all network notifier blocks
1649 * @val: value passed unmodified to notifier function
1650 * @dev: net_device pointer passed unmodified to notifier function
1652 * Call all network notifier blocks. Parameters and return value
1653 * are as for raw_notifier_call_chain().
1656 int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
1658 struct netdev_notifier_info info;
1660 return call_netdevice_notifiers_info(val, dev, &info);
1662 EXPORT_SYMBOL(call_netdevice_notifiers);
1664 #ifdef CONFIG_NET_INGRESS
1665 static struct static_key ingress_needed __read_mostly;
1667 void net_inc_ingress_queue(void)
1669 static_key_slow_inc(&ingress_needed);
1671 EXPORT_SYMBOL_GPL(net_inc_ingress_queue);
1673 void net_dec_ingress_queue(void)
1675 static_key_slow_dec(&ingress_needed);
1677 EXPORT_SYMBOL_GPL(net_dec_ingress_queue);
1680 #ifdef CONFIG_NET_EGRESS
1681 static struct static_key egress_needed __read_mostly;
1683 void net_inc_egress_queue(void)
1685 static_key_slow_inc(&egress_needed);
1687 EXPORT_SYMBOL_GPL(net_inc_egress_queue);
1689 void net_dec_egress_queue(void)
1691 static_key_slow_dec(&egress_needed);
1693 EXPORT_SYMBOL_GPL(net_dec_egress_queue);
1696 static struct static_key netstamp_needed __read_mostly;
1697 #ifdef HAVE_JUMP_LABEL
1698 /* We are not allowed to call static_key_slow_dec() from irq context
1699 * If net_disable_timestamp() is called from irq context, defer the
1700 * static_key_slow_dec() calls.
1702 static atomic_t netstamp_needed_deferred;
1705 void net_enable_timestamp(void)
1707 #ifdef HAVE_JUMP_LABEL
1708 int deferred = atomic_xchg(&netstamp_needed_deferred, 0);
1712 static_key_slow_dec(&netstamp_needed);
1716 static_key_slow_inc(&netstamp_needed);
1718 EXPORT_SYMBOL(net_enable_timestamp);
1720 void net_disable_timestamp(void)
1722 #ifdef HAVE_JUMP_LABEL
1723 if (in_interrupt()) {
1724 atomic_inc(&netstamp_needed_deferred);
1728 static_key_slow_dec(&netstamp_needed);
1730 EXPORT_SYMBOL(net_disable_timestamp);
1732 static inline void net_timestamp_set(struct sk_buff *skb)
1734 skb->tstamp.tv64 = 0;
1735 if (static_key_false(&netstamp_needed))
1736 __net_timestamp(skb);
1739 #define net_timestamp_check(COND, SKB) \
1740 if (static_key_false(&netstamp_needed)) { \
1741 if ((COND) && !(SKB)->tstamp.tv64) \
1742 __net_timestamp(SKB); \
1745 bool is_skb_forwardable(const struct net_device *dev, const struct sk_buff *skb)
1749 if (!(dev->flags & IFF_UP))
1752 len = dev->mtu + dev->hard_header_len + VLAN_HLEN;
1753 if (skb->len <= len)
1756 /* if TSO is enabled, we don't care about the length as the packet
1757 * could be forwarded without being segmented before
1759 if (skb_is_gso(skb))
1764 EXPORT_SYMBOL_GPL(is_skb_forwardable);
1766 int __dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
1768 if (skb_orphan_frags(skb, GFP_ATOMIC) ||
1769 unlikely(!is_skb_forwardable(dev, skb))) {
1770 atomic_long_inc(&dev->rx_dropped);
1775 skb_scrub_packet(skb, true);
1777 skb->protocol = eth_type_trans(skb, dev);
1778 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1782 EXPORT_SYMBOL_GPL(__dev_forward_skb);
1785 * dev_forward_skb - loopback an skb to another netif
1787 * @dev: destination network device
1788 * @skb: buffer to forward
1791 * NET_RX_SUCCESS (no congestion)
1792 * NET_RX_DROP (packet was dropped, but freed)
1794 * dev_forward_skb can be used for injecting an skb from the
1795 * start_xmit function of one device into the receive queue
1796 * of another device.
1798 * The receiving device may be in another namespace, so
1799 * we have to clear all information in the skb that could
1800 * impact namespace isolation.
1802 int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
1804 return __dev_forward_skb(dev, skb) ?: netif_rx_internal(skb);
1806 EXPORT_SYMBOL_GPL(dev_forward_skb);
1808 static inline int deliver_skb(struct sk_buff *skb,
1809 struct packet_type *pt_prev,
1810 struct net_device *orig_dev)
1812 if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC)))
1814 atomic_inc(&skb->users);
1815 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
1818 static inline void deliver_ptype_list_skb(struct sk_buff *skb,
1819 struct packet_type **pt,
1820 struct net_device *orig_dev,
1822 struct list_head *ptype_list)
1824 struct packet_type *ptype, *pt_prev = *pt;
1826 list_for_each_entry_rcu(ptype, ptype_list, list) {
1827 if (ptype->type != type)
1830 deliver_skb(skb, pt_prev, orig_dev);
1836 static inline bool skb_loop_sk(struct packet_type *ptype, struct sk_buff *skb)
1838 if (!ptype->af_packet_priv || !skb->sk)
1841 if (ptype->id_match)
1842 return ptype->id_match(ptype, skb->sk);
1843 else if ((struct sock *)ptype->af_packet_priv == skb->sk)
1850 * Support routine. Sends outgoing frames to any network
1851 * taps currently in use.
1854 void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1856 struct packet_type *ptype;
1857 struct sk_buff *skb2 = NULL;
1858 struct packet_type *pt_prev = NULL;
1859 struct list_head *ptype_list = &ptype_all;
1863 list_for_each_entry_rcu(ptype, ptype_list, list) {
1864 /* Never send packets back to the socket
1865 * they originated from - MvS (miquels@drinkel.ow.org)
1867 if (skb_loop_sk(ptype, skb))
1871 deliver_skb(skb2, pt_prev, skb->dev);
1876 /* need to clone skb, done only once */
1877 skb2 = skb_clone(skb, GFP_ATOMIC);
1881 net_timestamp_set(skb2);
1883 /* skb->nh should be correctly
1884 * set by sender, so that the second statement is
1885 * just protection against buggy protocols.
1887 skb_reset_mac_header(skb2);
1889 if (skb_network_header(skb2) < skb2->data ||
1890 skb_network_header(skb2) > skb_tail_pointer(skb2)) {
1891 net_crit_ratelimited("protocol %04x is buggy, dev %s\n",
1892 ntohs(skb2->protocol),
1894 skb_reset_network_header(skb2);
1897 skb2->transport_header = skb2->network_header;
1898 skb2->pkt_type = PACKET_OUTGOING;
1902 if (ptype_list == &ptype_all) {
1903 ptype_list = &dev->ptype_all;
1908 pt_prev->func(skb2, skb->dev, pt_prev, skb->dev);
1911 EXPORT_SYMBOL_GPL(dev_queue_xmit_nit);
1914 * netif_setup_tc - Handle tc mappings on real_num_tx_queues change
1915 * @dev: Network device
1916 * @txq: number of queues available
1918 * If real_num_tx_queues is changed the tc mappings may no longer be
1919 * valid. To resolve this verify the tc mapping remains valid and if
1920 * not NULL the mapping. With no priorities mapping to this
1921 * offset/count pair it will no longer be used. In the worst case TC0
1922 * is invalid nothing can be done so disable priority mappings. If is
1923 * expected that drivers will fix this mapping if they can before
1924 * calling netif_set_real_num_tx_queues.
1926 static void netif_setup_tc(struct net_device *dev, unsigned int txq)
1929 struct netdev_tc_txq *tc = &dev->tc_to_txq[0];
1931 /* If TC0 is invalidated disable TC mapping */
1932 if (tc->offset + tc->count > txq) {
1933 pr_warn("Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n");
1938 /* Invalidated prio to tc mappings set to TC0 */
1939 for (i = 1; i < TC_BITMASK + 1; i++) {
1940 int q = netdev_get_prio_tc_map(dev, i);
1942 tc = &dev->tc_to_txq[q];
1943 if (tc->offset + tc->count > txq) {
1944 pr_warn("Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n",
1946 netdev_set_prio_tc_map(dev, i, 0);
1952 static DEFINE_MUTEX(xps_map_mutex);
1953 #define xmap_dereference(P) \
1954 rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
1956 static struct xps_map *remove_xps_queue(struct xps_dev_maps *dev_maps,
1959 struct xps_map *map = NULL;
1963 map = xmap_dereference(dev_maps->cpu_map[cpu]);
1965 for (pos = 0; map && pos < map->len; pos++) {
1966 if (map->queues[pos] == index) {
1968 map->queues[pos] = map->queues[--map->len];
1970 RCU_INIT_POINTER(dev_maps->cpu_map[cpu], NULL);
1971 kfree_rcu(map, rcu);
1981 static void netif_reset_xps_queues_gt(struct net_device *dev, u16 index)
1983 struct xps_dev_maps *dev_maps;
1985 bool active = false;
1987 mutex_lock(&xps_map_mutex);
1988 dev_maps = xmap_dereference(dev->xps_maps);
1993 for_each_possible_cpu(cpu) {
1994 for (i = index; i < dev->num_tx_queues; i++) {
1995 if (!remove_xps_queue(dev_maps, cpu, i))
1998 if (i == dev->num_tx_queues)
2003 RCU_INIT_POINTER(dev->xps_maps, NULL);
2004 kfree_rcu(dev_maps, rcu);
2007 for (i = index; i < dev->num_tx_queues; i++)
2008 netdev_queue_numa_node_write(netdev_get_tx_queue(dev, i),
2012 mutex_unlock(&xps_map_mutex);
2015 static struct xps_map *expand_xps_map(struct xps_map *map,
2018 struct xps_map *new_map;
2019 int alloc_len = XPS_MIN_MAP_ALLOC;
2022 for (pos = 0; map && pos < map->len; pos++) {
2023 if (map->queues[pos] != index)
2028 /* Need to add queue to this CPU's existing map */
2030 if (pos < map->alloc_len)
2033 alloc_len = map->alloc_len * 2;
2036 /* Need to allocate new map to store queue on this CPU's map */
2037 new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len), GFP_KERNEL,
2042 for (i = 0; i < pos; i++)
2043 new_map->queues[i] = map->queues[i];
2044 new_map->alloc_len = alloc_len;
2050 int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask,
2053 struct xps_dev_maps *dev_maps, *new_dev_maps = NULL;
2054 struct xps_map *map, *new_map;
2055 int maps_sz = max_t(unsigned int, XPS_DEV_MAPS_SIZE, L1_CACHE_BYTES);
2056 int cpu, numa_node_id = -2;
2057 bool active = false;
2059 mutex_lock(&xps_map_mutex);
2061 dev_maps = xmap_dereference(dev->xps_maps);
2063 /* allocate memory for queue storage */
2064 for_each_online_cpu(cpu) {
2065 if (!cpumask_test_cpu(cpu, mask))
2069 new_dev_maps = kzalloc(maps_sz, GFP_KERNEL);
2070 if (!new_dev_maps) {
2071 mutex_unlock(&xps_map_mutex);
2075 map = dev_maps ? xmap_dereference(dev_maps->cpu_map[cpu]) :
2078 map = expand_xps_map(map, cpu, index);
2082 RCU_INIT_POINTER(new_dev_maps->cpu_map[cpu], map);
2086 goto out_no_new_maps;
2088 for_each_possible_cpu(cpu) {
2089 if (cpumask_test_cpu(cpu, mask) && cpu_online(cpu)) {
2090 /* add queue to CPU maps */
2093 map = xmap_dereference(new_dev_maps->cpu_map[cpu]);
2094 while ((pos < map->len) && (map->queues[pos] != index))
2097 if (pos == map->len)
2098 map->queues[map->len++] = index;
2100 if (numa_node_id == -2)
2101 numa_node_id = cpu_to_node(cpu);
2102 else if (numa_node_id != cpu_to_node(cpu))
2105 } else if (dev_maps) {
2106 /* fill in the new device map from the old device map */
2107 map = xmap_dereference(dev_maps->cpu_map[cpu]);
2108 RCU_INIT_POINTER(new_dev_maps->cpu_map[cpu], map);
2113 rcu_assign_pointer(dev->xps_maps, new_dev_maps);
2115 /* Cleanup old maps */
2117 for_each_possible_cpu(cpu) {
2118 new_map = xmap_dereference(new_dev_maps->cpu_map[cpu]);
2119 map = xmap_dereference(dev_maps->cpu_map[cpu]);
2120 if (map && map != new_map)
2121 kfree_rcu(map, rcu);
2124 kfree_rcu(dev_maps, rcu);
2127 dev_maps = new_dev_maps;
2131 /* update Tx queue numa node */
2132 netdev_queue_numa_node_write(netdev_get_tx_queue(dev, index),
2133 (numa_node_id >= 0) ? numa_node_id :
2139 /* removes queue from unused CPUs */
2140 for_each_possible_cpu(cpu) {
2141 if (cpumask_test_cpu(cpu, mask) && cpu_online(cpu))
2144 if (remove_xps_queue(dev_maps, cpu, index))
2148 /* free map if not active */
2150 RCU_INIT_POINTER(dev->xps_maps, NULL);
2151 kfree_rcu(dev_maps, rcu);
2155 mutex_unlock(&xps_map_mutex);
2159 /* remove any maps that we added */
2160 for_each_possible_cpu(cpu) {
2161 new_map = xmap_dereference(new_dev_maps->cpu_map[cpu]);
2162 map = dev_maps ? xmap_dereference(dev_maps->cpu_map[cpu]) :
2164 if (new_map && new_map != map)
2168 mutex_unlock(&xps_map_mutex);
2170 kfree(new_dev_maps);
2173 EXPORT_SYMBOL(netif_set_xps_queue);
2177 * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
2178 * greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
2180 int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq)
2184 if (txq < 1 || txq > dev->num_tx_queues)
2187 if (dev->reg_state == NETREG_REGISTERED ||
2188 dev->reg_state == NETREG_UNREGISTERING) {
2191 rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues,
2197 netif_setup_tc(dev, txq);
2199 if (txq < dev->real_num_tx_queues) {
2200 qdisc_reset_all_tx_gt(dev, txq);
2202 netif_reset_xps_queues_gt(dev, txq);
2207 dev->real_num_tx_queues = txq;
2210 EXPORT_SYMBOL(netif_set_real_num_tx_queues);
2214 * netif_set_real_num_rx_queues - set actual number of RX queues used
2215 * @dev: Network device
2216 * @rxq: Actual number of RX queues
2218 * This must be called either with the rtnl_lock held or before
2219 * registration of the net device. Returns 0 on success, or a
2220 * negative error code. If called before registration, it always
2223 int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq)
2227 if (rxq < 1 || rxq > dev->num_rx_queues)
2230 if (dev->reg_state == NETREG_REGISTERED) {
2233 rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues,
2239 dev->real_num_rx_queues = rxq;
2242 EXPORT_SYMBOL(netif_set_real_num_rx_queues);
2246 * netif_get_num_default_rss_queues - default number of RSS queues
2248 * This routine should set an upper limit on the number of RSS queues
2249 * used by default by multiqueue devices.
2251 int netif_get_num_default_rss_queues(void)
2253 return is_kdump_kernel() ?
2254 1 : min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES, num_online_cpus());
2256 EXPORT_SYMBOL(netif_get_num_default_rss_queues);
2258 static void __netif_reschedule(struct Qdisc *q)
2260 struct softnet_data *sd;
2261 unsigned long flags;
2263 local_irq_save(flags);
2264 sd = this_cpu_ptr(&softnet_data);
2265 q->next_sched = NULL;
2266 *sd->output_queue_tailp = q;
2267 sd->output_queue_tailp = &q->next_sched;
2268 raise_softirq_irqoff(NET_TX_SOFTIRQ);
2269 local_irq_restore(flags);
2272 void __netif_schedule(struct Qdisc *q)
2274 if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
2275 __netif_reschedule(q);
2277 EXPORT_SYMBOL(__netif_schedule);
2279 struct dev_kfree_skb_cb {
2280 enum skb_free_reason reason;
2283 static struct dev_kfree_skb_cb *get_kfree_skb_cb(const struct sk_buff *skb)
2285 return (struct dev_kfree_skb_cb *)skb->cb;
2288 void netif_schedule_queue(struct netdev_queue *txq)
2291 if (!(txq->state & QUEUE_STATE_ANY_XOFF)) {
2292 struct Qdisc *q = rcu_dereference(txq->qdisc);
2294 __netif_schedule(q);
2298 EXPORT_SYMBOL(netif_schedule_queue);
2301 * netif_wake_subqueue - allow sending packets on subqueue
2302 * @dev: network device
2303 * @queue_index: sub queue index
2305 * Resume individual transmit queue of a device with multiple transmit queues.
2307 void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
2309 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
2311 if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &txq->state)) {
2315 q = rcu_dereference(txq->qdisc);
2316 __netif_schedule(q);
2320 EXPORT_SYMBOL(netif_wake_subqueue);
2322 void netif_tx_wake_queue(struct netdev_queue *dev_queue)
2324 if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state)) {
2328 q = rcu_dereference(dev_queue->qdisc);
2329 __netif_schedule(q);
2333 EXPORT_SYMBOL(netif_tx_wake_queue);
2335 void __dev_kfree_skb_irq(struct sk_buff *skb, enum skb_free_reason reason)
2337 unsigned long flags;
2339 if (likely(atomic_read(&skb->users) == 1)) {
2341 atomic_set(&skb->users, 0);
2342 } else if (likely(!atomic_dec_and_test(&skb->users))) {
2345 get_kfree_skb_cb(skb)->reason = reason;
2346 local_irq_save(flags);
2347 skb->next = __this_cpu_read(softnet_data.completion_queue);
2348 __this_cpu_write(softnet_data.completion_queue, skb);
2349 raise_softirq_irqoff(NET_TX_SOFTIRQ);
2350 local_irq_restore(flags);
2352 EXPORT_SYMBOL(__dev_kfree_skb_irq);
2354 void __dev_kfree_skb_any(struct sk_buff *skb, enum skb_free_reason reason)
2356 if (in_irq() || irqs_disabled())
2357 __dev_kfree_skb_irq(skb, reason);
2361 EXPORT_SYMBOL(__dev_kfree_skb_any);
2365 * netif_device_detach - mark device as removed
2366 * @dev: network device
2368 * Mark device as removed from system and therefore no longer available.
2370 void netif_device_detach(struct net_device *dev)
2372 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
2373 netif_running(dev)) {
2374 netif_tx_stop_all_queues(dev);
2377 EXPORT_SYMBOL(netif_device_detach);
2380 * netif_device_attach - mark device as attached
2381 * @dev: network device
2383 * Mark device as attached from system and restart if needed.
2385 void netif_device_attach(struct net_device *dev)
2387 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
2388 netif_running(dev)) {
2389 netif_tx_wake_all_queues(dev);
2390 __netdev_watchdog_up(dev);
2393 EXPORT_SYMBOL(netif_device_attach);
2396 * Returns a Tx hash based on the given packet descriptor a Tx queues' number
2397 * to be used as a distribution range.
2399 u16 __skb_tx_hash(const struct net_device *dev, struct sk_buff *skb,
2400 unsigned int num_tx_queues)
2404 u16 qcount = num_tx_queues;
2406 if (skb_rx_queue_recorded(skb)) {
2407 hash = skb_get_rx_queue(skb);
2408 while (unlikely(hash >= num_tx_queues))
2409 hash -= num_tx_queues;
2414 u8 tc = netdev_get_prio_tc_map(dev, skb->priority);
2415 qoffset = dev->tc_to_txq[tc].offset;
2416 qcount = dev->tc_to_txq[tc].count;
2419 return (u16) reciprocal_scale(skb_get_hash(skb), qcount) + qoffset;
2421 EXPORT_SYMBOL(__skb_tx_hash);
2423 static void skb_warn_bad_offload(const struct sk_buff *skb)
2425 static const netdev_features_t null_features;
2426 struct net_device *dev = skb->dev;
2427 const char *name = "";
2429 if (!net_ratelimit())
2433 if (dev->dev.parent)
2434 name = dev_driver_string(dev->dev.parent);
2436 name = netdev_name(dev);
2438 WARN(1, "%s: caps=(%pNF, %pNF) len=%d data_len=%d gso_size=%d "
2439 "gso_type=%d ip_summed=%d\n",
2440 name, dev ? &dev->features : &null_features,
2441 skb->sk ? &skb->sk->sk_route_caps : &null_features,
2442 skb->len, skb->data_len, skb_shinfo(skb)->gso_size,
2443 skb_shinfo(skb)->gso_type, skb->ip_summed);
2447 * Invalidate hardware checksum when packet is to be mangled, and
2448 * complete checksum manually on outgoing path.
2450 int skb_checksum_help(struct sk_buff *skb)
2453 int ret = 0, offset;
2455 if (skb->ip_summed == CHECKSUM_COMPLETE)
2456 goto out_set_summed;
2458 if (unlikely(skb_shinfo(skb)->gso_size)) {
2459 skb_warn_bad_offload(skb);
2463 /* Before computing a checksum, we should make sure no frag could
2464 * be modified by an external entity : checksum could be wrong.
2466 if (skb_has_shared_frag(skb)) {
2467 ret = __skb_linearize(skb);
2472 offset = skb_checksum_start_offset(skb);
2473 BUG_ON(offset >= skb_headlen(skb));
2474 csum = skb_checksum(skb, offset, skb->len - offset, 0);
2476 offset += skb->csum_offset;
2477 BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
2479 if (skb_cloned(skb) &&
2480 !skb_clone_writable(skb, offset + sizeof(__sum16))) {
2481 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
2486 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
2488 skb->ip_summed = CHECKSUM_NONE;
2492 EXPORT_SYMBOL(skb_checksum_help);
2494 /* skb_csum_offload_check - Driver helper function to determine if a device
2495 * with limited checksum offload capabilities is able to offload the checksum
2496 * for a given packet.
2499 * skb - sk_buff for the packet in question
2500 * spec - contains the description of what device can offload
2501 * csum_encapped - returns true if the checksum being offloaded is
2502 * encpasulated. That is it is checksum for the transport header
2503 * in the inner headers.
2504 * checksum_help - when set indicates that helper function should
2505 * call skb_checksum_help if offload checks fail
2508 * true: Packet has passed the checksum checks and should be offloadable to
2509 * the device (a driver may still need to check for additional
2510 * restrictions of its device)
2511 * false: Checksum is not offloadable. If checksum_help was set then
2512 * skb_checksum_help was called to resolve checksum for non-GSO
2513 * packets and when IP protocol is not SCTP
2515 bool __skb_csum_offload_chk(struct sk_buff *skb,
2516 const struct skb_csum_offl_spec *spec,
2517 bool *csum_encapped,
2521 struct ipv6hdr *ipv6;
2526 if (skb->protocol == htons(ETH_P_8021Q) ||
2527 skb->protocol == htons(ETH_P_8021AD)) {
2528 if (!spec->vlan_okay)
2532 /* We check whether the checksum refers to a transport layer checksum in
2533 * the outermost header or an encapsulated transport layer checksum that
2534 * corresponds to the inner headers of the skb. If the checksum is for
2535 * something else in the packet we need help.
2537 if (skb_checksum_start_offset(skb) == skb_transport_offset(skb)) {
2538 /* Non-encapsulated checksum */
2539 protocol = eproto_to_ipproto(vlan_get_protocol(skb));
2540 nhdr = skb_network_header(skb);
2541 *csum_encapped = false;
2542 if (spec->no_not_encapped)
2544 } else if (skb->encapsulation && spec->encap_okay &&
2545 skb_checksum_start_offset(skb) ==
2546 skb_inner_transport_offset(skb)) {
2547 /* Encapsulated checksum */
2548 *csum_encapped = true;
2549 switch (skb->inner_protocol_type) {
2550 case ENCAP_TYPE_ETHER:
2551 protocol = eproto_to_ipproto(skb->inner_protocol);
2553 case ENCAP_TYPE_IPPROTO:
2554 protocol = skb->inner_protocol;
2557 nhdr = skb_inner_network_header(skb);
2564 if (!spec->ipv4_okay)
2567 ip_proto = iph->protocol;
2568 if (iph->ihl != 5 && !spec->ip_options_okay)
2572 if (!spec->ipv6_okay)
2574 if (spec->no_encapped_ipv6 && *csum_encapped)
2577 nhdr += sizeof(*ipv6);
2578 ip_proto = ipv6->nexthdr;
2587 if (!spec->tcp_okay ||
2588 skb->csum_offset != offsetof(struct tcphdr, check))
2592 if (!spec->udp_okay ||
2593 skb->csum_offset != offsetof(struct udphdr, check))
2597 if (!spec->sctp_okay ||
2598 skb->csum_offset != offsetof(struct sctphdr, checksum))
2602 case NEXTHDR_ROUTING:
2603 case NEXTHDR_DEST: {
2606 if (protocol != IPPROTO_IPV6 || !spec->ext_hdrs_okay)
2609 ip_proto = opthdr[0];
2610 nhdr += (opthdr[1] + 1) << 3;
2612 goto ip_proto_again;
2618 /* Passed the tests for offloading checksum */
2622 if (csum_help && !skb_shinfo(skb)->gso_size)
2623 skb_checksum_help(skb);
2627 EXPORT_SYMBOL(__skb_csum_offload_chk);
2629 __be16 skb_network_protocol(struct sk_buff *skb, int *depth)
2631 __be16 type = skb->protocol;
2633 /* Tunnel gso handlers can set protocol to ethernet. */
2634 if (type == htons(ETH_P_TEB)) {
2637 if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr))))
2640 eth = (struct ethhdr *)skb_mac_header(skb);
2641 type = eth->h_proto;
2644 return __vlan_get_protocol(skb, type, depth);
2648 * skb_mac_gso_segment - mac layer segmentation handler.
2649 * @skb: buffer to segment
2650 * @features: features for the output path (see dev->features)
2652 struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb,
2653 netdev_features_t features)
2655 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
2656 struct packet_offload *ptype;
2657 int vlan_depth = skb->mac_len;
2658 __be16 type = skb_network_protocol(skb, &vlan_depth);
2660 if (unlikely(!type))
2661 return ERR_PTR(-EINVAL);
2663 __skb_pull(skb, vlan_depth);
2666 list_for_each_entry_rcu(ptype, &offload_base, list) {
2667 if (ptype->type == type && ptype->callbacks.gso_segment) {
2668 segs = ptype->callbacks.gso_segment(skb, features);
2674 __skb_push(skb, skb->data - skb_mac_header(skb));
2678 EXPORT_SYMBOL(skb_mac_gso_segment);
2681 /* openvswitch calls this on rx path, so we need a different check.
2683 static inline bool skb_needs_check(struct sk_buff *skb, bool tx_path)
2686 return skb->ip_summed != CHECKSUM_PARTIAL;
2688 return skb->ip_summed == CHECKSUM_NONE;
2692 * __skb_gso_segment - Perform segmentation on skb.
2693 * @skb: buffer to segment
2694 * @features: features for the output path (see dev->features)
2695 * @tx_path: whether it is called in TX path
2697 * This function segments the given skb and returns a list of segments.
2699 * It may return NULL if the skb requires no segmentation. This is
2700 * only possible when GSO is used for verifying header integrity.
2702 * Segmentation preserves SKB_SGO_CB_OFFSET bytes of previous skb cb.
2704 struct sk_buff *__skb_gso_segment(struct sk_buff *skb,
2705 netdev_features_t features, bool tx_path)
2707 if (unlikely(skb_needs_check(skb, tx_path))) {
2710 skb_warn_bad_offload(skb);
2712 err = skb_cow_head(skb, 0);
2714 return ERR_PTR(err);
2717 /* Only report GSO partial support if it will enable us to
2718 * support segmentation on this frame without needing additional
2721 if (features & NETIF_F_GSO_PARTIAL) {
2722 netdev_features_t partial_features = NETIF_F_GSO_ROBUST;
2723 struct net_device *dev = skb->dev;
2725 partial_features |= dev->features & dev->gso_partial_features;
2726 if (!skb_gso_ok(skb, features | partial_features))
2727 features &= ~NETIF_F_GSO_PARTIAL;
2730 BUILD_BUG_ON(SKB_SGO_CB_OFFSET +
2731 sizeof(*SKB_GSO_CB(skb)) > sizeof(skb->cb));
2733 SKB_GSO_CB(skb)->mac_offset = skb_headroom(skb);
2734 SKB_GSO_CB(skb)->encap_level = 0;
2736 skb_reset_mac_header(skb);
2737 skb_reset_mac_len(skb);
2739 return skb_mac_gso_segment(skb, features);
2741 EXPORT_SYMBOL(__skb_gso_segment);
2743 /* Take action when hardware reception checksum errors are detected. */
2745 void netdev_rx_csum_fault(struct net_device *dev)
2747 if (net_ratelimit()) {
2748 pr_err("%s: hw csum failure\n", dev ? dev->name : "<unknown>");
2752 EXPORT_SYMBOL(netdev_rx_csum_fault);
2755 /* Actually, we should eliminate this check as soon as we know, that:
2756 * 1. IOMMU is present and allows to map all the memory.
2757 * 2. No high memory really exists on this machine.
2760 static int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
2762 #ifdef CONFIG_HIGHMEM
2764 if (!(dev->features & NETIF_F_HIGHDMA)) {
2765 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
2766 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
2767 if (PageHighMem(skb_frag_page(frag)))
2772 if (PCI_DMA_BUS_IS_PHYS) {
2773 struct device *pdev = dev->dev.parent;
2777 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
2778 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
2779 dma_addr_t addr = page_to_phys(skb_frag_page(frag));
2780 if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask)
2788 /* If MPLS offload request, verify we are testing hardware MPLS features
2789 * instead of standard features for the netdev.
2791 #if IS_ENABLED(CONFIG_NET_MPLS_GSO)
2792 static netdev_features_t net_mpls_features(struct sk_buff *skb,
2793 netdev_features_t features,
2796 if (eth_p_mpls(type))
2797 features &= skb->dev->mpls_features;
2802 static netdev_features_t net_mpls_features(struct sk_buff *skb,
2803 netdev_features_t features,
2810 static netdev_features_t harmonize_features(struct sk_buff *skb,
2811 netdev_features_t features)
2816 type = skb_network_protocol(skb, &tmp);
2817 features = net_mpls_features(skb, features, type);
2819 if (skb->ip_summed != CHECKSUM_NONE &&
2820 !can_checksum_protocol(features, type)) {
2821 features &= ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK);
2822 } else if (illegal_highdma(skb->dev, skb)) {
2823 features &= ~NETIF_F_SG;
2829 netdev_features_t passthru_features_check(struct sk_buff *skb,
2830 struct net_device *dev,
2831 netdev_features_t features)
2835 EXPORT_SYMBOL(passthru_features_check);
2837 static netdev_features_t dflt_features_check(const struct sk_buff *skb,
2838 struct net_device *dev,
2839 netdev_features_t features)
2841 return vlan_features_check(skb, features);
2844 static netdev_features_t gso_features_check(const struct sk_buff *skb,
2845 struct net_device *dev,
2846 netdev_features_t features)
2848 u16 gso_segs = skb_shinfo(skb)->gso_segs;
2850 if (gso_segs > dev->gso_max_segs)
2851 return features & ~NETIF_F_GSO_MASK;
2853 /* Support for GSO partial features requires software
2854 * intervention before we can actually process the packets
2855 * so we need to strip support for any partial features now
2856 * and we can pull them back in after we have partially
2857 * segmented the frame.
2859 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL))
2860 features &= ~dev->gso_partial_features;
2862 /* Make sure to clear the IPv4 ID mangling feature if the
2863 * IPv4 header has the potential to be fragmented.
2865 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) {
2866 struct iphdr *iph = skb->encapsulation ?
2867 inner_ip_hdr(skb) : ip_hdr(skb);
2869 if (!(iph->frag_off & htons(IP_DF)))
2870 features &= ~NETIF_F_TSO_MANGLEID;
2876 netdev_features_t netif_skb_features(struct sk_buff *skb)
2878 struct net_device *dev = skb->dev;
2879 netdev_features_t features = dev->features;
2881 if (skb_is_gso(skb))
2882 features = gso_features_check(skb, dev, features);
2884 /* If encapsulation offload request, verify we are testing
2885 * hardware encapsulation features instead of standard
2886 * features for the netdev
2888 if (skb->encapsulation)
2889 features &= dev->hw_enc_features;
2891 if (skb_vlan_tagged(skb))
2892 features = netdev_intersect_features(features,
2893 dev->vlan_features |
2894 NETIF_F_HW_VLAN_CTAG_TX |
2895 NETIF_F_HW_VLAN_STAG_TX);
2897 if (dev->netdev_ops->ndo_features_check)
2898 features &= dev->netdev_ops->ndo_features_check(skb, dev,
2901 features &= dflt_features_check(skb, dev, features);
2903 return harmonize_features(skb, features);
2905 EXPORT_SYMBOL(netif_skb_features);
2907 static int xmit_one(struct sk_buff *skb, struct net_device *dev,
2908 struct netdev_queue *txq, bool more)
2913 if (!list_empty(&ptype_all) || !list_empty(&dev->ptype_all))
2914 dev_queue_xmit_nit(skb, dev);
2917 trace_net_dev_start_xmit(skb, dev);
2918 rc = netdev_start_xmit(skb, dev, txq, more);
2919 trace_net_dev_xmit(skb, rc, dev, len);
2924 struct sk_buff *dev_hard_start_xmit(struct sk_buff *first, struct net_device *dev,
2925 struct netdev_queue *txq, int *ret)
2927 struct sk_buff *skb = first;
2928 int rc = NETDEV_TX_OK;
2931 struct sk_buff *next = skb->next;
2934 rc = xmit_one(skb, dev, txq, next != NULL);
2935 if (unlikely(!dev_xmit_complete(rc))) {
2941 if (netif_xmit_stopped(txq) && skb) {
2942 rc = NETDEV_TX_BUSY;
2952 static struct sk_buff *validate_xmit_vlan(struct sk_buff *skb,
2953 netdev_features_t features)
2955 if (skb_vlan_tag_present(skb) &&
2956 !vlan_hw_offload_capable(features, skb->vlan_proto))
2957 skb = __vlan_hwaccel_push_inside(skb);
2961 static struct sk_buff *validate_xmit_skb(struct sk_buff *skb, struct net_device *dev)
2963 netdev_features_t features;
2965 features = netif_skb_features(skb);
2966 skb = validate_xmit_vlan(skb, features);
2970 if (netif_needs_gso(skb, features)) {
2971 struct sk_buff *segs;
2973 segs = skb_gso_segment(skb, features);
2981 if (skb_needs_linearize(skb, features) &&
2982 __skb_linearize(skb))
2985 /* If packet is not checksummed and device does not
2986 * support checksumming for this protocol, complete
2987 * checksumming here.
2989 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2990 if (skb->encapsulation)
2991 skb_set_inner_transport_header(skb,
2992 skb_checksum_start_offset(skb));
2994 skb_set_transport_header(skb,
2995 skb_checksum_start_offset(skb));
2996 if (!(features & NETIF_F_CSUM_MASK) &&
2997 skb_checksum_help(skb))
3007 atomic_long_inc(&dev->tx_dropped);
3011 struct sk_buff *validate_xmit_skb_list(struct sk_buff *skb, struct net_device *dev)
3013 struct sk_buff *next, *head = NULL, *tail;
3015 for (; skb != NULL; skb = next) {
3019 /* in case skb wont be segmented, point to itself */
3022 skb = validate_xmit_skb(skb, dev);
3030 /* If skb was segmented, skb->prev points to
3031 * the last segment. If not, it still contains skb.
3038 static void qdisc_pkt_len_init(struct sk_buff *skb)
3040 const struct skb_shared_info *shinfo = skb_shinfo(skb);
3042 qdisc_skb_cb(skb)->pkt_len = skb->len;
3044 /* To get more precise estimation of bytes sent on wire,
3045 * we add to pkt_len the headers size of all segments
3047 if (shinfo->gso_size) {
3048 unsigned int hdr_len;
3049 u16 gso_segs = shinfo->gso_segs;
3051 /* mac layer + network layer */
3052 hdr_len = skb_transport_header(skb) - skb_mac_header(skb);
3054 /* + transport layer */
3055 if (likely(shinfo->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6)))
3056 hdr_len += tcp_hdrlen(skb);
3058 hdr_len += sizeof(struct udphdr);
3060 if (shinfo->gso_type & SKB_GSO_DODGY)
3061 gso_segs = DIV_ROUND_UP(skb->len - hdr_len,
3064 qdisc_skb_cb(skb)->pkt_len += (gso_segs - 1) * hdr_len;
3068 static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
3069 struct net_device *dev,
3070 struct netdev_queue *txq)
3072 spinlock_t *root_lock = qdisc_lock(q);
3076 qdisc_calculate_pkt_len(skb, q);
3078 * Heuristic to force contended enqueues to serialize on a
3079 * separate lock before trying to get qdisc main lock.
3080 * This permits qdisc->running owner to get the lock more
3081 * often and dequeue packets faster.
3083 contended = qdisc_is_running(q);
3084 if (unlikely(contended))
3085 spin_lock(&q->busylock);
3087 spin_lock(root_lock);
3088 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
3091 } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) &&
3092 qdisc_run_begin(q)) {
3094 * This is a work-conserving queue; there are no old skbs
3095 * waiting to be sent out; and the qdisc is not running -
3096 * xmit the skb directly.
3099 qdisc_bstats_update(q, skb);
3101 if (sch_direct_xmit(skb, q, dev, txq, root_lock, true)) {
3102 if (unlikely(contended)) {
3103 spin_unlock(&q->busylock);
3110 rc = NET_XMIT_SUCCESS;
3112 rc = q->enqueue(skb, q) & NET_XMIT_MASK;
3113 if (qdisc_run_begin(q)) {
3114 if (unlikely(contended)) {
3115 spin_unlock(&q->busylock);
3121 spin_unlock(root_lock);
3122 if (unlikely(contended))
3123 spin_unlock(&q->busylock);
3127 #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
3128 static void skb_update_prio(struct sk_buff *skb)
3130 struct netprio_map *map = rcu_dereference_bh(skb->dev->priomap);
3132 if (!skb->priority && skb->sk && map) {
3133 unsigned int prioidx =
3134 sock_cgroup_prioidx(&skb->sk->sk_cgrp_data);
3136 if (prioidx < map->priomap_len)
3137 skb->priority = map->priomap[prioidx];
3141 #define skb_update_prio(skb)
3144 DEFINE_PER_CPU(int, xmit_recursion);
3145 EXPORT_SYMBOL(xmit_recursion);
3148 * dev_loopback_xmit - loop back @skb
3149 * @net: network namespace this loopback is happening in
3150 * @sk: sk needed to be a netfilter okfn
3151 * @skb: buffer to transmit
3153 int dev_loopback_xmit(struct net *net, struct sock *sk, struct sk_buff *skb)
3155 skb_reset_mac_header(skb);
3156 __skb_pull(skb, skb_network_offset(skb));
3157 skb->pkt_type = PACKET_LOOPBACK;
3158 skb->ip_summed = CHECKSUM_UNNECESSARY;
3159 WARN_ON(!skb_dst(skb));
3164 EXPORT_SYMBOL(dev_loopback_xmit);
3166 #ifdef CONFIG_NET_EGRESS
3167 static struct sk_buff *
3168 sch_handle_egress(struct sk_buff *skb, int *ret, struct net_device *dev)
3170 struct tcf_proto *cl = rcu_dereference_bh(dev->egress_cl_list);
3171 struct tcf_result cl_res;
3176 /* skb->tc_verd and qdisc_skb_cb(skb)->pkt_len were already set
3177 * earlier by the caller.
3179 qdisc_bstats_cpu_update(cl->q, skb);
3181 switch (tc_classify(skb, cl, &cl_res, false)) {
3183 case TC_ACT_RECLASSIFY:
3184 skb->tc_index = TC_H_MIN(cl_res.classid);
3187 qdisc_qstats_cpu_drop(cl->q);
3188 *ret = NET_XMIT_DROP;
3193 *ret = NET_XMIT_SUCCESS;
3196 case TC_ACT_REDIRECT:
3197 /* No need to push/pop skb's mac_header here on egress! */
3198 skb_do_redirect(skb);
3199 *ret = NET_XMIT_SUCCESS;
3207 #endif /* CONFIG_NET_EGRESS */
3209 static inline int get_xps_queue(struct net_device *dev, struct sk_buff *skb)
3212 struct xps_dev_maps *dev_maps;
3213 struct xps_map *map;
3214 int queue_index = -1;
3217 dev_maps = rcu_dereference(dev->xps_maps);
3219 map = rcu_dereference(
3220 dev_maps->cpu_map[skb->sender_cpu - 1]);
3223 queue_index = map->queues[0];
3225 queue_index = map->queues[reciprocal_scale(skb_get_hash(skb),
3227 if (unlikely(queue_index >= dev->real_num_tx_queues))
3239 static u16 __netdev_pick_tx(struct net_device *dev, struct sk_buff *skb)
3241 struct sock *sk = skb->sk;
3242 int queue_index = sk_tx_queue_get(sk);
3244 if (queue_index < 0 || skb->ooo_okay ||
3245 queue_index >= dev->real_num_tx_queues) {
3246 int new_index = get_xps_queue(dev, skb);
3248 new_index = skb_tx_hash(dev, skb);
3250 if (queue_index != new_index && sk &&
3252 rcu_access_pointer(sk->sk_dst_cache))
3253 sk_tx_queue_set(sk, new_index);
3255 queue_index = new_index;
3261 struct netdev_queue *netdev_pick_tx(struct net_device *dev,
3262 struct sk_buff *skb,
3265 int queue_index = 0;
3268 u32 sender_cpu = skb->sender_cpu - 1;
3270 if (sender_cpu >= (u32)NR_CPUS)
3271 skb->sender_cpu = raw_smp_processor_id() + 1;
3274 if (dev->real_num_tx_queues != 1) {
3275 const struct net_device_ops *ops = dev->netdev_ops;
3276 if (ops->ndo_select_queue)
3277 queue_index = ops->ndo_select_queue(dev, skb, accel_priv,
3280 queue_index = __netdev_pick_tx(dev, skb);
3283 queue_index = netdev_cap_txqueue(dev, queue_index);
3286 skb_set_queue_mapping(skb, queue_index);
3287 return netdev_get_tx_queue(dev, queue_index);
3291 * __dev_queue_xmit - transmit a buffer
3292 * @skb: buffer to transmit
3293 * @accel_priv: private data used for L2 forwarding offload
3295 * Queue a buffer for transmission to a network device. The caller must
3296 * have set the device and priority and built the buffer before calling
3297 * this function. The function can be called from an interrupt.
3299 * A negative errno code is returned on a failure. A success does not
3300 * guarantee the frame will be transmitted as it may be dropped due
3301 * to congestion or traffic shaping.
3303 * -----------------------------------------------------------------------------------
3304 * I notice this method can also return errors from the queue disciplines,
3305 * including NET_XMIT_DROP, which is a positive value. So, errors can also
3308 * Regardless of the return value, the skb is consumed, so it is currently
3309 * difficult to retry a send to this method. (You can bump the ref count
3310 * before sending to hold a reference for retry if you are careful.)
3312 * When calling this method, interrupts MUST be enabled. This is because
3313 * the BH enable code must have IRQs enabled so that it will not deadlock.
3316 static int __dev_queue_xmit(struct sk_buff *skb, void *accel_priv)
3318 struct net_device *dev = skb->dev;
3319 struct netdev_queue *txq;
3323 skb_reset_mac_header(skb);
3325 if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_SCHED_TSTAMP))
3326 __skb_tstamp_tx(skb, NULL, skb->sk, SCM_TSTAMP_SCHED);
3328 /* Disable soft irqs for various locks below. Also
3329 * stops preemption for RCU.
3333 skb_update_prio(skb);
3335 qdisc_pkt_len_init(skb);
3336 #ifdef CONFIG_NET_CLS_ACT
3337 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS);
3338 # ifdef CONFIG_NET_EGRESS
3339 if (static_key_false(&egress_needed)) {
3340 skb = sch_handle_egress(skb, &rc, dev);
3346 /* If device/qdisc don't need skb->dst, release it right now while
3347 * its hot in this cpu cache.
3349 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
3354 #ifdef CONFIG_NET_SWITCHDEV
3355 /* Don't forward if offload device already forwarded */
3356 if (skb->offload_fwd_mark &&
3357 skb->offload_fwd_mark == dev->offload_fwd_mark) {
3359 rc = NET_XMIT_SUCCESS;
3364 txq = netdev_pick_tx(dev, skb, accel_priv);
3365 q = rcu_dereference_bh(txq->qdisc);
3367 trace_net_dev_queue(skb);
3369 rc = __dev_xmit_skb(skb, q, dev, txq);
3373 /* The device has no queue. Common case for software devices:
3374 loopback, all the sorts of tunnels...
3376 Really, it is unlikely that netif_tx_lock protection is necessary
3377 here. (f.e. loopback and IP tunnels are clean ignoring statistics
3379 However, it is possible, that they rely on protection
3382 Check this and shot the lock. It is not prone from deadlocks.
3383 Either shot noqueue qdisc, it is even simpler 8)
3385 if (dev->flags & IFF_UP) {
3386 int cpu = smp_processor_id(); /* ok because BHs are off */
3388 if (txq->xmit_lock_owner != cpu) {
3389 if (unlikely(__this_cpu_read(xmit_recursion) >
3390 XMIT_RECURSION_LIMIT))
3391 goto recursion_alert;
3393 skb = validate_xmit_skb(skb, dev);
3397 HARD_TX_LOCK(dev, txq, cpu);
3399 if (!netif_xmit_stopped(txq)) {
3400 __this_cpu_inc(xmit_recursion);
3401 skb = dev_hard_start_xmit(skb, dev, txq, &rc);
3402 __this_cpu_dec(xmit_recursion);
3403 if (dev_xmit_complete(rc)) {
3404 HARD_TX_UNLOCK(dev, txq);
3408 HARD_TX_UNLOCK(dev, txq);
3409 net_crit_ratelimited("Virtual device %s asks to queue packet!\n",
3412 /* Recursion is detected! It is possible,
3416 net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n",
3422 rcu_read_unlock_bh();
3424 atomic_long_inc(&dev->tx_dropped);
3425 kfree_skb_list(skb);
3428 rcu_read_unlock_bh();
3432 int dev_queue_xmit(struct sk_buff *skb)
3434 return __dev_queue_xmit(skb, NULL);
3436 EXPORT_SYMBOL(dev_queue_xmit);
3438 int dev_queue_xmit_accel(struct sk_buff *skb, void *accel_priv)
3440 return __dev_queue_xmit(skb, accel_priv);
3442 EXPORT_SYMBOL(dev_queue_xmit_accel);
3445 /*=======================================================================
3447 =======================================================================*/
3449 int netdev_max_backlog __read_mostly = 1000;
3450 EXPORT_SYMBOL(netdev_max_backlog);
3452 int netdev_tstamp_prequeue __read_mostly = 1;
3453 int netdev_budget __read_mostly = 300;
3454 int weight_p __read_mostly = 64; /* old backlog weight */
3456 /* Called with irq disabled */
3457 static inline void ____napi_schedule(struct softnet_data *sd,
3458 struct napi_struct *napi)
3460 list_add_tail(&napi->poll_list, &sd->poll_list);
3461 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3466 /* One global table that all flow-based protocols share. */
3467 struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly;
3468 EXPORT_SYMBOL(rps_sock_flow_table);
3469 u32 rps_cpu_mask __read_mostly;
3470 EXPORT_SYMBOL(rps_cpu_mask);
3472 struct static_key rps_needed __read_mostly;
3473 EXPORT_SYMBOL(rps_needed);
3475 static struct rps_dev_flow *
3476 set_rps_cpu(struct net_device *dev, struct sk_buff *skb,
3477 struct rps_dev_flow *rflow, u16 next_cpu)
3479 if (next_cpu < nr_cpu_ids) {
3480 #ifdef CONFIG_RFS_ACCEL
3481 struct netdev_rx_queue *rxqueue;
3482 struct rps_dev_flow_table *flow_table;
3483 struct rps_dev_flow *old_rflow;
3488 /* Should we steer this flow to a different hardware queue? */
3489 if (!skb_rx_queue_recorded(skb) || !dev->rx_cpu_rmap ||
3490 !(dev->features & NETIF_F_NTUPLE))
3492 rxq_index = cpu_rmap_lookup_index(dev->rx_cpu_rmap, next_cpu);
3493 if (rxq_index == skb_get_rx_queue(skb))
3496 rxqueue = dev->_rx + rxq_index;
3497 flow_table = rcu_dereference(rxqueue->rps_flow_table);
3500 flow_id = skb_get_hash(skb) & flow_table->mask;
3501 rc = dev->netdev_ops->ndo_rx_flow_steer(dev, skb,
3502 rxq_index, flow_id);
3506 rflow = &flow_table->flows[flow_id];
3508 if (old_rflow->filter == rflow->filter)
3509 old_rflow->filter = RPS_NO_FILTER;
3513 per_cpu(softnet_data, next_cpu).input_queue_head;
3516 rflow->cpu = next_cpu;
3521 * get_rps_cpu is called from netif_receive_skb and returns the target
3522 * CPU from the RPS map of the receiving queue for a given skb.
3523 * rcu_read_lock must be held on entry.
3525 static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
3526 struct rps_dev_flow **rflowp)
3528 const struct rps_sock_flow_table *sock_flow_table;
3529 struct netdev_rx_queue *rxqueue = dev->_rx;
3530 struct rps_dev_flow_table *flow_table;
3531 struct rps_map *map;
3536 if (skb_rx_queue_recorded(skb)) {
3537 u16 index = skb_get_rx_queue(skb);
3539 if (unlikely(index >= dev->real_num_rx_queues)) {
3540 WARN_ONCE(dev->real_num_rx_queues > 1,
3541 "%s received packet on queue %u, but number "
3542 "of RX queues is %u\n",
3543 dev->name, index, dev->real_num_rx_queues);
3549 /* Avoid computing hash if RFS/RPS is not active for this rxqueue */
3551 flow_table = rcu_dereference(rxqueue->rps_flow_table);
3552 map = rcu_dereference(rxqueue->rps_map);
3553 if (!flow_table && !map)
3556 skb_reset_network_header(skb);
3557 hash = skb_get_hash(skb);
3561 sock_flow_table = rcu_dereference(rps_sock_flow_table);
3562 if (flow_table && sock_flow_table) {
3563 struct rps_dev_flow *rflow;
3567 /* First check into global flow table if there is a match */
3568 ident = sock_flow_table->ents[hash & sock_flow_table->mask];
3569 if ((ident ^ hash) & ~rps_cpu_mask)
3572 next_cpu = ident & rps_cpu_mask;
3574 /* OK, now we know there is a match,
3575 * we can look at the local (per receive queue) flow table
3577 rflow = &flow_table->flows[hash & flow_table->mask];
3581 * If the desired CPU (where last recvmsg was done) is
3582 * different from current CPU (one in the rx-queue flow
3583 * table entry), switch if one of the following holds:
3584 * - Current CPU is unset (>= nr_cpu_ids).
3585 * - Current CPU is offline.
3586 * - The current CPU's queue tail has advanced beyond the
3587 * last packet that was enqueued using this table entry.
3588 * This guarantees that all previous packets for the flow
3589 * have been dequeued, thus preserving in order delivery.
3591 if (unlikely(tcpu != next_cpu) &&
3592 (tcpu >= nr_cpu_ids || !cpu_online(tcpu) ||
3593 ((int)(per_cpu(softnet_data, tcpu).input_queue_head -
3594 rflow->last_qtail)) >= 0)) {
3596 rflow = set_rps_cpu(dev, skb, rflow, next_cpu);
3599 if (tcpu < nr_cpu_ids && cpu_online(tcpu)) {
3609 tcpu = map->cpus[reciprocal_scale(hash, map->len)];
3610 if (cpu_online(tcpu)) {
3620 #ifdef CONFIG_RFS_ACCEL
3623 * rps_may_expire_flow - check whether an RFS hardware filter may be removed
3624 * @dev: Device on which the filter was set
3625 * @rxq_index: RX queue index
3626 * @flow_id: Flow ID passed to ndo_rx_flow_steer()
3627 * @filter_id: Filter ID returned by ndo_rx_flow_steer()
3629 * Drivers that implement ndo_rx_flow_steer() should periodically call
3630 * this function for each installed filter and remove the filters for
3631 * which it returns %true.
3633 bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index,
3634 u32 flow_id, u16 filter_id)
3636 struct netdev_rx_queue *rxqueue = dev->_rx + rxq_index;
3637 struct rps_dev_flow_table *flow_table;
3638 struct rps_dev_flow *rflow;
3643 flow_table = rcu_dereference(rxqueue->rps_flow_table);
3644 if (flow_table && flow_id <= flow_table->mask) {
3645 rflow = &flow_table->flows[flow_id];
3646 cpu = ACCESS_ONCE(rflow->cpu);
3647 if (rflow->filter == filter_id && cpu < nr_cpu_ids &&
3648 ((int)(per_cpu(softnet_data, cpu).input_queue_head -
3649 rflow->last_qtail) <
3650 (int)(10 * flow_table->mask)))
3656 EXPORT_SYMBOL(rps_may_expire_flow);
3658 #endif /* CONFIG_RFS_ACCEL */
3660 /* Called from hardirq (IPI) context */
3661 static void rps_trigger_softirq(void *data)
3663 struct softnet_data *sd = data;
3665 ____napi_schedule(sd, &sd->backlog);
3669 #endif /* CONFIG_RPS */
3672 * Check if this softnet_data structure is another cpu one
3673 * If yes, queue it to our IPI list and return 1
3676 static int rps_ipi_queued(struct softnet_data *sd)
3679 struct softnet_data *mysd = this_cpu_ptr(&softnet_data);
3682 sd->rps_ipi_next = mysd->rps_ipi_list;
3683 mysd->rps_ipi_list = sd;
3685 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3688 #endif /* CONFIG_RPS */
3692 #ifdef CONFIG_NET_FLOW_LIMIT
3693 int netdev_flow_limit_table_len __read_mostly = (1 << 12);
3696 static bool skb_flow_limit(struct sk_buff *skb, unsigned int qlen)
3698 #ifdef CONFIG_NET_FLOW_LIMIT
3699 struct sd_flow_limit *fl;
3700 struct softnet_data *sd;
3701 unsigned int old_flow, new_flow;
3703 if (qlen < (netdev_max_backlog >> 1))
3706 sd = this_cpu_ptr(&softnet_data);
3709 fl = rcu_dereference(sd->flow_limit);
3711 new_flow = skb_get_hash(skb) & (fl->num_buckets - 1);
3712 old_flow = fl->history[fl->history_head];
3713 fl->history[fl->history_head] = new_flow;
3716 fl->history_head &= FLOW_LIMIT_HISTORY - 1;
3718 if (likely(fl->buckets[old_flow]))
3719 fl->buckets[old_flow]--;
3721 if (++fl->buckets[new_flow] > (FLOW_LIMIT_HISTORY >> 1)) {
3733 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
3734 * queue (may be a remote CPU queue).
3736 static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
3737 unsigned int *qtail)
3739 struct softnet_data *sd;
3740 unsigned long flags;
3743 sd = &per_cpu(softnet_data, cpu);
3745 local_irq_save(flags);
3748 if (!netif_running(skb->dev))
3750 qlen = skb_queue_len(&sd->input_pkt_queue);
3751 if (qlen <= netdev_max_backlog && !skb_flow_limit(skb, qlen)) {
3754 __skb_queue_tail(&sd->input_pkt_queue, skb);
3755 input_queue_tail_incr_save(sd, qtail);
3757 local_irq_restore(flags);
3758 return NET_RX_SUCCESS;
3761 /* Schedule NAPI for backlog device
3762 * We can use non atomic operation since we own the queue lock
3764 if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) {
3765 if (!rps_ipi_queued(sd))
3766 ____napi_schedule(sd, &sd->backlog);
3775 local_irq_restore(flags);
3777 atomic_long_inc(&skb->dev->rx_dropped);
3782 static int netif_rx_internal(struct sk_buff *skb)
3786 net_timestamp_check(netdev_tstamp_prequeue, skb);
3788 trace_netif_rx(skb);
3790 if (static_key_false(&rps_needed)) {
3791 struct rps_dev_flow voidflow, *rflow = &voidflow;
3797 cpu = get_rps_cpu(skb->dev, skb, &rflow);
3799 cpu = smp_processor_id();
3801 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
3809 ret = enqueue_to_backlog(skb, get_cpu(), &qtail);
3816 * netif_rx - post buffer to the network code
3817 * @skb: buffer to post
3819 * This function receives a packet from a device driver and queues it for
3820 * the upper (protocol) levels to process. It always succeeds. The buffer
3821 * may be dropped during processing for congestion control or by the
3825 * NET_RX_SUCCESS (no congestion)
3826 * NET_RX_DROP (packet was dropped)
3830 int netif_rx(struct sk_buff *skb)
3832 trace_netif_rx_entry(skb);
3834 return netif_rx_internal(skb);
3836 EXPORT_SYMBOL(netif_rx);
3838 int netif_rx_ni(struct sk_buff *skb)
3842 trace_netif_rx_ni_entry(skb);
3845 err = netif_rx_internal(skb);
3846 if (local_softirq_pending())
3852 EXPORT_SYMBOL(netif_rx_ni);
3854 static void net_tx_action(struct softirq_action *h)
3856 struct softnet_data *sd = this_cpu_ptr(&softnet_data);
3858 if (sd->completion_queue) {
3859 struct sk_buff *clist;
3861 local_irq_disable();
3862 clist = sd->completion_queue;
3863 sd->completion_queue = NULL;
3867 struct sk_buff *skb = clist;
3868 clist = clist->next;
3870 WARN_ON(atomic_read(&skb->users));
3871 if (likely(get_kfree_skb_cb(skb)->reason == SKB_REASON_CONSUMED))
3872 trace_consume_skb(skb);
3874 trace_kfree_skb(skb, net_tx_action);
3876 if (skb->fclone != SKB_FCLONE_UNAVAILABLE)
3879 __kfree_skb_defer(skb);
3882 __kfree_skb_flush();
3885 if (sd->output_queue) {
3888 local_irq_disable();
3889 head = sd->output_queue;
3890 sd->output_queue = NULL;
3891 sd->output_queue_tailp = &sd->output_queue;
3895 struct Qdisc *q = head;
3896 spinlock_t *root_lock;
3898 head = head->next_sched;
3900 root_lock = qdisc_lock(q);
3901 spin_lock(root_lock);
3902 /* We need to make sure head->next_sched is read
3903 * before clearing __QDISC_STATE_SCHED
3905 smp_mb__before_atomic();
3906 clear_bit(__QDISC_STATE_SCHED, &q->state);
3908 spin_unlock(root_lock);
3913 #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
3914 (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
3915 /* This hook is defined here for ATM LANE */
3916 int (*br_fdb_test_addr_hook)(struct net_device *dev,
3917 unsigned char *addr) __read_mostly;
3918 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
3921 static inline struct sk_buff *
3922 sch_handle_ingress(struct sk_buff *skb, struct packet_type **pt_prev, int *ret,
3923 struct net_device *orig_dev)
3925 #ifdef CONFIG_NET_CLS_ACT
3926 struct tcf_proto *cl = rcu_dereference_bh(skb->dev->ingress_cl_list);
3927 struct tcf_result cl_res;
3929 /* If there's at least one ingress present somewhere (so
3930 * we get here via enabled static key), remaining devices
3931 * that are not configured with an ingress qdisc will bail
3937 *ret = deliver_skb(skb, *pt_prev, orig_dev);
3941 qdisc_skb_cb(skb)->pkt_len = skb->len;
3942 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
3943 qdisc_bstats_cpu_update(cl->q, skb);
3945 switch (tc_classify(skb, cl, &cl_res, false)) {
3947 case TC_ACT_RECLASSIFY:
3948 skb->tc_index = TC_H_MIN(cl_res.classid);
3951 qdisc_qstats_cpu_drop(cl->q);
3958 case TC_ACT_REDIRECT:
3959 /* skb_mac_header check was done by cls/act_bpf, so
3960 * we can safely push the L2 header back before
3961 * redirecting to another netdev
3963 __skb_push(skb, skb->mac_len);
3964 skb_do_redirect(skb);
3969 #endif /* CONFIG_NET_CLS_ACT */
3974 * netdev_rx_handler_register - register receive handler
3975 * @dev: device to register a handler for
3976 * @rx_handler: receive handler to register
3977 * @rx_handler_data: data pointer that is used by rx handler
3979 * Register a receive handler for a device. This handler will then be
3980 * called from __netif_receive_skb. A negative errno code is returned
3983 * The caller must hold the rtnl_mutex.
3985 * For a general description of rx_handler, see enum rx_handler_result.
3987 int netdev_rx_handler_register(struct net_device *dev,
3988 rx_handler_func_t *rx_handler,
3989 void *rx_handler_data)
3993 if (dev->rx_handler)
3996 /* Note: rx_handler_data must be set before rx_handler */
3997 rcu_assign_pointer(dev->rx_handler_data, rx_handler_data);
3998 rcu_assign_pointer(dev->rx_handler, rx_handler);
4002 EXPORT_SYMBOL_GPL(netdev_rx_handler_register);
4005 * netdev_rx_handler_unregister - unregister receive handler
4006 * @dev: device to unregister a handler from
4008 * Unregister a receive handler from a device.
4010 * The caller must hold the rtnl_mutex.
4012 void netdev_rx_handler_unregister(struct net_device *dev)
4016 RCU_INIT_POINTER(dev->rx_handler, NULL);
4017 /* a reader seeing a non NULL rx_handler in a rcu_read_lock()
4018 * section has a guarantee to see a non NULL rx_handler_data
4022 RCU_INIT_POINTER(dev->rx_handler_data, NULL);
4024 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister);
4027 * Limit the use of PFMEMALLOC reserves to those protocols that implement
4028 * the special handling of PFMEMALLOC skbs.
4030 static bool skb_pfmemalloc_protocol(struct sk_buff *skb)
4032 switch (skb->protocol) {
4033 case htons(ETH_P_ARP):
4034 case htons(ETH_P_IP):
4035 case htons(ETH_P_IPV6):
4036 case htons(ETH_P_8021Q):
4037 case htons(ETH_P_8021AD):
4044 static inline int nf_ingress(struct sk_buff *skb, struct packet_type **pt_prev,
4045 int *ret, struct net_device *orig_dev)
4047 #ifdef CONFIG_NETFILTER_INGRESS
4048 if (nf_hook_ingress_active(skb)) {
4050 *ret = deliver_skb(skb, *pt_prev, orig_dev);
4054 return nf_hook_ingress(skb);
4056 #endif /* CONFIG_NETFILTER_INGRESS */
4060 static int __netif_receive_skb_core(struct sk_buff *skb, bool pfmemalloc)
4062 struct packet_type *ptype, *pt_prev;
4063 rx_handler_func_t *rx_handler;
4064 struct net_device *orig_dev;
4065 bool deliver_exact = false;
4066 int ret = NET_RX_DROP;
4069 net_timestamp_check(!netdev_tstamp_prequeue, skb);
4071 trace_netif_receive_skb(skb);
4073 orig_dev = skb->dev;
4075 skb_reset_network_header(skb);
4076 if (!skb_transport_header_was_set(skb))
4077 skb_reset_transport_header(skb);
4078 skb_reset_mac_len(skb);
4083 skb->skb_iif = skb->dev->ifindex;
4085 __this_cpu_inc(softnet_data.processed);
4087 if (skb->protocol == cpu_to_be16(ETH_P_8021Q) ||
4088 skb->protocol == cpu_to_be16(ETH_P_8021AD)) {
4089 skb = skb_vlan_untag(skb);
4094 #ifdef CONFIG_NET_CLS_ACT
4095 if (skb->tc_verd & TC_NCLS) {
4096 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
4104 list_for_each_entry_rcu(ptype, &ptype_all, list) {
4106 ret = deliver_skb(skb, pt_prev, orig_dev);
4110 list_for_each_entry_rcu(ptype, &skb->dev->ptype_all, list) {
4112 ret = deliver_skb(skb, pt_prev, orig_dev);
4117 #ifdef CONFIG_NET_INGRESS
4118 if (static_key_false(&ingress_needed)) {
4119 skb = sch_handle_ingress(skb, &pt_prev, &ret, orig_dev);
4123 if (nf_ingress(skb, &pt_prev, &ret, orig_dev) < 0)
4127 #ifdef CONFIG_NET_CLS_ACT
4131 if (pfmemalloc && !skb_pfmemalloc_protocol(skb))
4134 if (skb_vlan_tag_present(skb)) {
4136 ret = deliver_skb(skb, pt_prev, orig_dev);
4139 if (vlan_do_receive(&skb))
4141 else if (unlikely(!skb))
4145 rx_handler = rcu_dereference(skb->dev->rx_handler);
4148 ret = deliver_skb(skb, pt_prev, orig_dev);
4151 switch (rx_handler(&skb)) {
4152 case RX_HANDLER_CONSUMED:
4153 ret = NET_RX_SUCCESS;
4155 case RX_HANDLER_ANOTHER:
4157 case RX_HANDLER_EXACT:
4158 deliver_exact = true;
4159 case RX_HANDLER_PASS:
4166 if (unlikely(skb_vlan_tag_present(skb))) {
4167 if (skb_vlan_tag_get_id(skb))
4168 skb->pkt_type = PACKET_OTHERHOST;
4169 /* Note: we might in the future use prio bits
4170 * and set skb->priority like in vlan_do_receive()
4171 * For the time being, just ignore Priority Code Point
4176 type = skb->protocol;
4178 /* deliver only exact match when indicated */
4179 if (likely(!deliver_exact)) {
4180 deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type,
4181 &ptype_base[ntohs(type) &
4185 deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type,
4186 &orig_dev->ptype_specific);
4188 if (unlikely(skb->dev != orig_dev)) {
4189 deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type,
4190 &skb->dev->ptype_specific);
4194 if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC)))
4197 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
4201 atomic_long_inc(&skb->dev->rx_dropped);
4203 atomic_long_inc(&skb->dev->rx_nohandler);
4205 /* Jamal, now you will not able to escape explaining
4206 * me how you were going to use this. :-)
4215 static int __netif_receive_skb(struct sk_buff *skb)
4219 if (sk_memalloc_socks() && skb_pfmemalloc(skb)) {
4220 unsigned long pflags = current->flags;
4223 * PFMEMALLOC skbs are special, they should
4224 * - be delivered to SOCK_MEMALLOC sockets only
4225 * - stay away from userspace
4226 * - have bounded memory usage
4228 * Use PF_MEMALLOC as this saves us from propagating the allocation
4229 * context down to all allocation sites.
4231 current->flags |= PF_MEMALLOC;
4232 ret = __netif_receive_skb_core(skb, true);
4233 tsk_restore_flags(current, pflags, PF_MEMALLOC);
4235 ret = __netif_receive_skb_core(skb, false);
4240 static int netif_receive_skb_internal(struct sk_buff *skb)
4244 net_timestamp_check(netdev_tstamp_prequeue, skb);
4246 if (skb_defer_rx_timestamp(skb))
4247 return NET_RX_SUCCESS;
4252 if (static_key_false(&rps_needed)) {
4253 struct rps_dev_flow voidflow, *rflow = &voidflow;
4254 int cpu = get_rps_cpu(skb->dev, skb, &rflow);
4257 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
4263 ret = __netif_receive_skb(skb);
4269 * netif_receive_skb - process receive buffer from network
4270 * @skb: buffer to process
4272 * netif_receive_skb() is the main receive data processing function.
4273 * It always succeeds. The buffer may be dropped during processing
4274 * for congestion control or by the protocol layers.
4276 * This function may only be called from softirq context and interrupts
4277 * should be enabled.
4279 * Return values (usually ignored):
4280 * NET_RX_SUCCESS: no congestion
4281 * NET_RX_DROP: packet was dropped
4283 int netif_receive_skb(struct sk_buff *skb)
4285 trace_netif_receive_skb_entry(skb);
4287 return netif_receive_skb_internal(skb);
4289 EXPORT_SYMBOL(netif_receive_skb);
4291 /* Network device is going away, flush any packets still pending
4292 * Called with irqs disabled.
4294 static void flush_backlog(void *arg)
4296 struct net_device *dev = arg;
4297 struct softnet_data *sd = this_cpu_ptr(&softnet_data);
4298 struct sk_buff *skb, *tmp;
4301 skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) {
4302 if (skb->dev == dev) {
4303 __skb_unlink(skb, &sd->input_pkt_queue);
4305 input_queue_head_incr(sd);
4310 skb_queue_walk_safe(&sd->process_queue, skb, tmp) {
4311 if (skb->dev == dev) {
4312 __skb_unlink(skb, &sd->process_queue);
4314 input_queue_head_incr(sd);
4319 static int napi_gro_complete(struct sk_buff *skb)
4321 struct packet_offload *ptype;
4322 __be16 type = skb->protocol;
4323 struct list_head *head = &offload_base;
4326 BUILD_BUG_ON(sizeof(struct napi_gro_cb) > sizeof(skb->cb));
4328 if (NAPI_GRO_CB(skb)->count == 1) {
4329 skb_shinfo(skb)->gso_size = 0;
4334 list_for_each_entry_rcu(ptype, head, list) {
4335 if (ptype->type != type || !ptype->callbacks.gro_complete)
4338 err = ptype->callbacks.gro_complete(skb, 0);
4344 WARN_ON(&ptype->list == head);
4346 return NET_RX_SUCCESS;
4350 return netif_receive_skb_internal(skb);
4353 /* napi->gro_list contains packets ordered by age.
4354 * youngest packets at the head of it.
4355 * Complete skbs in reverse order to reduce latencies.
4357 void napi_gro_flush(struct napi_struct *napi, bool flush_old)
4359 struct sk_buff *skb, *prev = NULL;
4361 /* scan list and build reverse chain */
4362 for (skb = napi->gro_list; skb != NULL; skb = skb->next) {
4367 for (skb = prev; skb; skb = prev) {
4370 if (flush_old && NAPI_GRO_CB(skb)->age == jiffies)
4374 napi_gro_complete(skb);
4378 napi->gro_list = NULL;
4380 EXPORT_SYMBOL(napi_gro_flush);
4382 static void gro_list_prepare(struct napi_struct *napi, struct sk_buff *skb)
4385 unsigned int maclen = skb->dev->hard_header_len;
4386 u32 hash = skb_get_hash_raw(skb);
4388 for (p = napi->gro_list; p; p = p->next) {
4389 unsigned long diffs;
4391 NAPI_GRO_CB(p)->flush = 0;
4393 if (hash != skb_get_hash_raw(p)) {
4394 NAPI_GRO_CB(p)->same_flow = 0;
4398 diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev;
4399 diffs |= p->vlan_tci ^ skb->vlan_tci;
4400 diffs |= skb_metadata_dst_cmp(p, skb);
4401 if (maclen == ETH_HLEN)
4402 diffs |= compare_ether_header(skb_mac_header(p),
4403 skb_mac_header(skb));
4405 diffs = memcmp(skb_mac_header(p),
4406 skb_mac_header(skb),
4408 NAPI_GRO_CB(p)->same_flow = !diffs;
4412 static void skb_gro_reset_offset(struct sk_buff *skb)
4414 const struct skb_shared_info *pinfo = skb_shinfo(skb);
4415 const skb_frag_t *frag0 = &pinfo->frags[0];
4417 NAPI_GRO_CB(skb)->data_offset = 0;
4418 NAPI_GRO_CB(skb)->frag0 = NULL;
4419 NAPI_GRO_CB(skb)->frag0_len = 0;
4421 if (skb_mac_header(skb) == skb_tail_pointer(skb) &&
4423 !PageHighMem(skb_frag_page(frag0))) {
4424 NAPI_GRO_CB(skb)->frag0 = skb_frag_address(frag0);
4425 NAPI_GRO_CB(skb)->frag0_len = skb_frag_size(frag0);
4429 static void gro_pull_from_frag0(struct sk_buff *skb, int grow)
4431 struct skb_shared_info *pinfo = skb_shinfo(skb);
4433 BUG_ON(skb->end - skb->tail < grow);
4435 memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);
4437 skb->data_len -= grow;
4440 pinfo->frags[0].page_offset += grow;
4441 skb_frag_size_sub(&pinfo->frags[0], grow);
4443 if (unlikely(!skb_frag_size(&pinfo->frags[0]))) {
4444 skb_frag_unref(skb, 0);
4445 memmove(pinfo->frags, pinfo->frags + 1,
4446 --pinfo->nr_frags * sizeof(pinfo->frags[0]));
4450 static enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
4452 struct sk_buff **pp = NULL;
4453 struct packet_offload *ptype;
4454 __be16 type = skb->protocol;
4455 struct list_head *head = &offload_base;
4457 enum gro_result ret;
4460 if (!(skb->dev->features & NETIF_F_GRO))
4463 if (skb_is_gso(skb) || skb_has_frag_list(skb) || skb->csum_bad)
4466 gro_list_prepare(napi, skb);
4469 list_for_each_entry_rcu(ptype, head, list) {
4470 if (ptype->type != type || !ptype->callbacks.gro_receive)
4473 skb_set_network_header(skb, skb_gro_offset(skb));
4474 skb_reset_mac_len(skb);
4475 NAPI_GRO_CB(skb)->same_flow = 0;
4476 NAPI_GRO_CB(skb)->flush = 0;
4477 NAPI_GRO_CB(skb)->free = 0;
4478 NAPI_GRO_CB(skb)->encap_mark = 0;
4479 NAPI_GRO_CB(skb)->is_fou = 0;
4480 NAPI_GRO_CB(skb)->is_atomic = 1;
4481 NAPI_GRO_CB(skb)->gro_remcsum_start = 0;
4483 /* Setup for GRO checksum validation */
4484 switch (skb->ip_summed) {
4485 case CHECKSUM_COMPLETE:
4486 NAPI_GRO_CB(skb)->csum = skb->csum;
4487 NAPI_GRO_CB(skb)->csum_valid = 1;
4488 NAPI_GRO_CB(skb)->csum_cnt = 0;
4490 case CHECKSUM_UNNECESSARY:
4491 NAPI_GRO_CB(skb)->csum_cnt = skb->csum_level + 1;
4492 NAPI_GRO_CB(skb)->csum_valid = 0;
4495 NAPI_GRO_CB(skb)->csum_cnt = 0;
4496 NAPI_GRO_CB(skb)->csum_valid = 0;
4499 pp = ptype->callbacks.gro_receive(&napi->gro_list, skb);
4504 if (&ptype->list == head)
4507 same_flow = NAPI_GRO_CB(skb)->same_flow;
4508 ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
4511 struct sk_buff *nskb = *pp;
4515 napi_gro_complete(nskb);
4522 if (NAPI_GRO_CB(skb)->flush)
4525 if (unlikely(napi->gro_count >= MAX_GRO_SKBS)) {
4526 struct sk_buff *nskb = napi->gro_list;
4528 /* locate the end of the list to select the 'oldest' flow */
4529 while (nskb->next) {
4535 napi_gro_complete(nskb);
4539 NAPI_GRO_CB(skb)->count = 1;
4540 NAPI_GRO_CB(skb)->age = jiffies;
4541 NAPI_GRO_CB(skb)->last = skb;
4542 skb_shinfo(skb)->gso_size = skb_gro_len(skb);
4543 skb->next = napi->gro_list;
4544 napi->gro_list = skb;
4548 grow = skb_gro_offset(skb) - skb_headlen(skb);
4550 gro_pull_from_frag0(skb, grow);
4559 struct packet_offload *gro_find_receive_by_type(__be16 type)
4561 struct list_head *offload_head = &offload_base;
4562 struct packet_offload *ptype;
4564 list_for_each_entry_rcu(ptype, offload_head, list) {
4565 if (ptype->type != type || !ptype->callbacks.gro_receive)
4571 EXPORT_SYMBOL(gro_find_receive_by_type);
4573 struct packet_offload *gro_find_complete_by_type(__be16 type)
4575 struct list_head *offload_head = &offload_base;
4576 struct packet_offload *ptype;
4578 list_for_each_entry_rcu(ptype, offload_head, list) {
4579 if (ptype->type != type || !ptype->callbacks.gro_complete)
4585 EXPORT_SYMBOL(gro_find_complete_by_type);
4587 static gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
4591 if (netif_receive_skb_internal(skb))
4599 case GRO_MERGED_FREE:
4600 if (NAPI_GRO_CB(skb)->free == NAPI_GRO_FREE_STOLEN_HEAD) {
4602 kmem_cache_free(skbuff_head_cache, skb);
4616 gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
4618 skb_mark_napi_id(skb, napi);
4619 trace_napi_gro_receive_entry(skb);
4621 skb_gro_reset_offset(skb);
4623 return napi_skb_finish(dev_gro_receive(napi, skb), skb);
4625 EXPORT_SYMBOL(napi_gro_receive);
4627 static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
4629 if (unlikely(skb->pfmemalloc)) {
4633 __skb_pull(skb, skb_headlen(skb));
4634 /* restore the reserve we had after netdev_alloc_skb_ip_align() */
4635 skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN - skb_headroom(skb));
4637 skb->dev = napi->dev;
4639 skb->encapsulation = 0;
4640 skb_shinfo(skb)->gso_type = 0;
4641 skb->truesize = SKB_TRUESIZE(skb_end_offset(skb));
4646 struct sk_buff *napi_get_frags(struct napi_struct *napi)
4648 struct sk_buff *skb = napi->skb;
4651 skb = napi_alloc_skb(napi, GRO_MAX_HEAD);
4654 skb_mark_napi_id(skb, napi);
4659 EXPORT_SYMBOL(napi_get_frags);
4661 static gro_result_t napi_frags_finish(struct napi_struct *napi,
4662 struct sk_buff *skb,
4668 __skb_push(skb, ETH_HLEN);
4669 skb->protocol = eth_type_trans(skb, skb->dev);
4670 if (ret == GRO_NORMAL && netif_receive_skb_internal(skb))
4675 case GRO_MERGED_FREE:
4676 napi_reuse_skb(napi, skb);
4686 /* Upper GRO stack assumes network header starts at gro_offset=0
4687 * Drivers could call both napi_gro_frags() and napi_gro_receive()
4688 * We copy ethernet header into skb->data to have a common layout.
4690 static struct sk_buff *napi_frags_skb(struct napi_struct *napi)
4692 struct sk_buff *skb = napi->skb;
4693 const struct ethhdr *eth;
4694 unsigned int hlen = sizeof(*eth);
4698 skb_reset_mac_header(skb);
4699 skb_gro_reset_offset(skb);
4701 eth = skb_gro_header_fast(skb, 0);
4702 if (unlikely(skb_gro_header_hard(skb, hlen))) {
4703 eth = skb_gro_header_slow(skb, hlen, 0);
4704 if (unlikely(!eth)) {
4705 net_warn_ratelimited("%s: dropping impossible skb from %s\n",
4706 __func__, napi->dev->name);
4707 napi_reuse_skb(napi, skb);
4711 gro_pull_from_frag0(skb, hlen);
4712 NAPI_GRO_CB(skb)->frag0 += hlen;
4713 NAPI_GRO_CB(skb)->frag0_len -= hlen;
4715 __skb_pull(skb, hlen);
4718 * This works because the only protocols we care about don't require
4720 * We'll fix it up properly in napi_frags_finish()
4722 skb->protocol = eth->h_proto;
4727 gro_result_t napi_gro_frags(struct napi_struct *napi)
4729 struct sk_buff *skb = napi_frags_skb(napi);
4734 trace_napi_gro_frags_entry(skb);
4736 return napi_frags_finish(napi, skb, dev_gro_receive(napi, skb));
4738 EXPORT_SYMBOL(napi_gro_frags);
4740 /* Compute the checksum from gro_offset and return the folded value
4741 * after adding in any pseudo checksum.
4743 __sum16 __skb_gro_checksum_complete(struct sk_buff *skb)
4748 wsum = skb_checksum(skb, skb_gro_offset(skb), skb_gro_len(skb), 0);
4750 /* NAPI_GRO_CB(skb)->csum holds pseudo checksum */
4751 sum = csum_fold(csum_add(NAPI_GRO_CB(skb)->csum, wsum));
4753 if (unlikely(skb->ip_summed == CHECKSUM_COMPLETE) &&
4754 !skb->csum_complete_sw)
4755 netdev_rx_csum_fault(skb->dev);
4758 NAPI_GRO_CB(skb)->csum = wsum;
4759 NAPI_GRO_CB(skb)->csum_valid = 1;
4763 EXPORT_SYMBOL(__skb_gro_checksum_complete);
4766 * net_rps_action_and_irq_enable sends any pending IPI's for rps.
4767 * Note: called with local irq disabled, but exits with local irq enabled.
4769 static void net_rps_action_and_irq_enable(struct softnet_data *sd)
4772 struct softnet_data *remsd = sd->rps_ipi_list;
4775 sd->rps_ipi_list = NULL;
4779 /* Send pending IPI's to kick RPS processing on remote cpus. */
4781 struct softnet_data *next = remsd->rps_ipi_next;
4783 if (cpu_online(remsd->cpu))
4784 smp_call_function_single_async(remsd->cpu,
4793 static bool sd_has_rps_ipi_waiting(struct softnet_data *sd)
4796 return sd->rps_ipi_list != NULL;
4802 static int process_backlog(struct napi_struct *napi, int quota)
4805 struct softnet_data *sd = container_of(napi, struct softnet_data, backlog);
4807 /* Check if we have pending ipi, its better to send them now,
4808 * not waiting net_rx_action() end.
4810 if (sd_has_rps_ipi_waiting(sd)) {
4811 local_irq_disable();
4812 net_rps_action_and_irq_enable(sd);
4815 napi->weight = weight_p;
4816 local_irq_disable();
4818 struct sk_buff *skb;
4820 while ((skb = __skb_dequeue(&sd->process_queue))) {
4823 __netif_receive_skb(skb);
4825 local_irq_disable();
4826 input_queue_head_incr(sd);
4827 if (++work >= quota) {
4834 if (skb_queue_empty(&sd->input_pkt_queue)) {
4836 * Inline a custom version of __napi_complete().
4837 * only current cpu owns and manipulates this napi,
4838 * and NAPI_STATE_SCHED is the only possible flag set
4840 * We can use a plain write instead of clear_bit(),
4841 * and we dont need an smp_mb() memory barrier.
4849 skb_queue_splice_tail_init(&sd->input_pkt_queue,
4850 &sd->process_queue);
4859 * __napi_schedule - schedule for receive
4860 * @n: entry to schedule
4862 * The entry's receive function will be scheduled to run.
4863 * Consider using __napi_schedule_irqoff() if hard irqs are masked.
4865 void __napi_schedule(struct napi_struct *n)
4867 unsigned long flags;
4869 local_irq_save(flags);
4870 ____napi_schedule(this_cpu_ptr(&softnet_data), n);
4871 local_irq_restore(flags);
4873 EXPORT_SYMBOL(__napi_schedule);
4876 * __napi_schedule_irqoff - schedule for receive
4877 * @n: entry to schedule
4879 * Variant of __napi_schedule() assuming hard irqs are masked
4881 void __napi_schedule_irqoff(struct napi_struct *n)
4883 ____napi_schedule(this_cpu_ptr(&softnet_data), n);
4885 EXPORT_SYMBOL(__napi_schedule_irqoff);
4887 void __napi_complete(struct napi_struct *n)
4889 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
4891 list_del_init(&n->poll_list);
4892 smp_mb__before_atomic();
4893 clear_bit(NAPI_STATE_SCHED, &n->state);
4895 EXPORT_SYMBOL(__napi_complete);
4897 void napi_complete_done(struct napi_struct *n, int work_done)
4899 unsigned long flags;
4902 * don't let napi dequeue from the cpu poll list
4903 * just in case its running on a different cpu
4905 if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state)))
4909 unsigned long timeout = 0;
4912 timeout = n->dev->gro_flush_timeout;
4915 hrtimer_start(&n->timer, ns_to_ktime(timeout),
4916 HRTIMER_MODE_REL_PINNED);
4918 napi_gro_flush(n, false);
4920 if (likely(list_empty(&n->poll_list))) {
4921 WARN_ON_ONCE(!test_and_clear_bit(NAPI_STATE_SCHED, &n->state));
4923 /* If n->poll_list is not empty, we need to mask irqs */
4924 local_irq_save(flags);
4926 local_irq_restore(flags);
4929 EXPORT_SYMBOL(napi_complete_done);
4931 /* must be called under rcu_read_lock(), as we dont take a reference */
4932 static struct napi_struct *napi_by_id(unsigned int napi_id)
4934 unsigned int hash = napi_id % HASH_SIZE(napi_hash);
4935 struct napi_struct *napi;
4937 hlist_for_each_entry_rcu(napi, &napi_hash[hash], napi_hash_node)
4938 if (napi->napi_id == napi_id)
4944 #if defined(CONFIG_NET_RX_BUSY_POLL)
4945 #define BUSY_POLL_BUDGET 8
4946 bool sk_busy_loop(struct sock *sk, int nonblock)
4948 unsigned long end_time = !nonblock ? sk_busy_loop_end_time(sk) : 0;
4949 int (*busy_poll)(struct napi_struct *dev);
4950 struct napi_struct *napi;
4955 napi = napi_by_id(sk->sk_napi_id);
4959 /* Note: ndo_busy_poll method is optional in linux-4.5 */
4960 busy_poll = napi->dev->netdev_ops->ndo_busy_poll;
4966 rc = busy_poll(napi);
4967 } else if (napi_schedule_prep(napi)) {
4968 void *have = netpoll_poll_lock(napi);
4970 if (test_bit(NAPI_STATE_SCHED, &napi->state)) {
4971 rc = napi->poll(napi, BUSY_POLL_BUDGET);
4972 trace_napi_poll(napi);
4973 if (rc == BUSY_POLL_BUDGET) {
4974 napi_complete_done(napi, rc);
4975 napi_schedule(napi);
4978 netpoll_poll_unlock(have);
4981 __NET_ADD_STATS(sock_net(sk),
4982 LINUX_MIB_BUSYPOLLRXPACKETS, rc);
4985 if (rc == LL_FLUSH_FAILED)
4986 break; /* permanent failure */
4989 } while (!nonblock && skb_queue_empty(&sk->sk_receive_queue) &&
4990 !need_resched() && !busy_loop_timeout(end_time));
4992 rc = !skb_queue_empty(&sk->sk_receive_queue);
4997 EXPORT_SYMBOL(sk_busy_loop);
4999 #endif /* CONFIG_NET_RX_BUSY_POLL */
5001 void napi_hash_add(struct napi_struct *napi)
5003 if (test_bit(NAPI_STATE_NO_BUSY_POLL, &napi->state) ||
5004 test_and_set_bit(NAPI_STATE_HASHED, &napi->state))
5007 spin_lock(&napi_hash_lock);
5009 /* 0..NR_CPUS+1 range is reserved for sender_cpu use */
5011 if (unlikely(++napi_gen_id < NR_CPUS + 1))
5012 napi_gen_id = NR_CPUS + 1;
5013 } while (napi_by_id(napi_gen_id));
5014 napi->napi_id = napi_gen_id;
5016 hlist_add_head_rcu(&napi->napi_hash_node,
5017 &napi_hash[napi->napi_id % HASH_SIZE(napi_hash)]);
5019 spin_unlock(&napi_hash_lock);
5021 EXPORT_SYMBOL_GPL(napi_hash_add);
5023 /* Warning : caller is responsible to make sure rcu grace period
5024 * is respected before freeing memory containing @napi
5026 bool napi_hash_del(struct napi_struct *napi)
5028 bool rcu_sync_needed = false;
5030 spin_lock(&napi_hash_lock);
5032 if (test_and_clear_bit(NAPI_STATE_HASHED, &napi->state)) {
5033 rcu_sync_needed = true;
5034 hlist_del_rcu(&napi->napi_hash_node);
5036 spin_unlock(&napi_hash_lock);
5037 return rcu_sync_needed;
5039 EXPORT_SYMBOL_GPL(napi_hash_del);
5041 static enum hrtimer_restart napi_watchdog(struct hrtimer *timer)
5043 struct napi_struct *napi;
5045 napi = container_of(timer, struct napi_struct, timer);
5047 napi_schedule(napi);
5049 return HRTIMER_NORESTART;
5052 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
5053 int (*poll)(struct napi_struct *, int), int weight)
5055 INIT_LIST_HEAD(&napi->poll_list);
5056 hrtimer_init(&napi->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_PINNED);
5057 napi->timer.function = napi_watchdog;
5058 napi->gro_count = 0;
5059 napi->gro_list = NULL;
5062 if (weight > NAPI_POLL_WEIGHT)
5063 pr_err_once("netif_napi_add() called with weight %d on device %s\n",
5065 napi->weight = weight;
5066 list_add(&napi->dev_list, &dev->napi_list);
5068 #ifdef CONFIG_NETPOLL
5069 spin_lock_init(&napi->poll_lock);
5070 napi->poll_owner = -1;
5072 set_bit(NAPI_STATE_SCHED, &napi->state);
5073 napi_hash_add(napi);
5075 EXPORT_SYMBOL(netif_napi_add);
5077 void napi_disable(struct napi_struct *n)
5080 set_bit(NAPI_STATE_DISABLE, &n->state);
5082 while (test_and_set_bit(NAPI_STATE_SCHED, &n->state))
5084 while (test_and_set_bit(NAPI_STATE_NPSVC, &n->state))
5087 hrtimer_cancel(&n->timer);
5089 clear_bit(NAPI_STATE_DISABLE, &n->state);
5091 EXPORT_SYMBOL(napi_disable);
5093 /* Must be called in process context */
5094 void netif_napi_del(struct napi_struct *napi)
5097 if (napi_hash_del(napi))
5099 list_del_init(&napi->dev_list);
5100 napi_free_frags(napi);
5102 kfree_skb_list(napi->gro_list);
5103 napi->gro_list = NULL;
5104 napi->gro_count = 0;
5106 EXPORT_SYMBOL(netif_napi_del);
5108 static int napi_poll(struct napi_struct *n, struct list_head *repoll)
5113 list_del_init(&n->poll_list);
5115 have = netpoll_poll_lock(n);
5119 /* This NAPI_STATE_SCHED test is for avoiding a race
5120 * with netpoll's poll_napi(). Only the entity which
5121 * obtains the lock and sees NAPI_STATE_SCHED set will
5122 * actually make the ->poll() call. Therefore we avoid
5123 * accidentally calling ->poll() when NAPI is not scheduled.
5126 if (test_bit(NAPI_STATE_SCHED, &n->state)) {
5127 work = n->poll(n, weight);
5131 WARN_ON_ONCE(work > weight);
5133 if (likely(work < weight))
5136 /* Drivers must not modify the NAPI state if they
5137 * consume the entire weight. In such cases this code
5138 * still "owns" the NAPI instance and therefore can
5139 * move the instance around on the list at-will.
5141 if (unlikely(napi_disable_pending(n))) {
5147 /* flush too old packets
5148 * If HZ < 1000, flush all packets.
5150 napi_gro_flush(n, HZ >= 1000);
5153 /* Some drivers may have called napi_schedule
5154 * prior to exhausting their budget.
5156 if (unlikely(!list_empty(&n->poll_list))) {
5157 pr_warn_once("%s: Budget exhausted after napi rescheduled\n",
5158 n->dev ? n->dev->name : "backlog");
5162 list_add_tail(&n->poll_list, repoll);
5165 netpoll_poll_unlock(have);
5170 static void net_rx_action(struct softirq_action *h)
5172 struct softnet_data *sd = this_cpu_ptr(&softnet_data);
5173 unsigned long time_limit = jiffies + 2;
5174 int budget = netdev_budget;
5178 local_irq_disable();
5179 list_splice_init(&sd->poll_list, &list);
5183 struct napi_struct *n;
5185 if (list_empty(&list)) {
5186 if (!sd_has_rps_ipi_waiting(sd) && list_empty(&repoll))
5191 n = list_first_entry(&list, struct napi_struct, poll_list);
5192 budget -= napi_poll(n, &repoll);
5194 /* If softirq window is exhausted then punt.
5195 * Allow this to run for 2 jiffies since which will allow
5196 * an average latency of 1.5/HZ.
5198 if (unlikely(budget <= 0 ||
5199 time_after_eq(jiffies, time_limit))) {
5205 __kfree_skb_flush();
5206 local_irq_disable();
5208 list_splice_tail_init(&sd->poll_list, &list);
5209 list_splice_tail(&repoll, &list);
5210 list_splice(&list, &sd->poll_list);
5211 if (!list_empty(&sd->poll_list))
5212 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
5214 net_rps_action_and_irq_enable(sd);
5217 struct netdev_adjacent {
5218 struct net_device *dev;
5220 /* upper master flag, there can only be one master device per list */
5223 /* counter for the number of times this device was added to us */
5226 /* private field for the users */
5229 struct list_head list;
5230 struct rcu_head rcu;
5233 static struct netdev_adjacent *__netdev_find_adj(struct net_device *adj_dev,
5234 struct list_head *adj_list)
5236 struct netdev_adjacent *adj;
5238 list_for_each_entry(adj, adj_list, list) {
5239 if (adj->dev == adj_dev)
5246 * netdev_has_upper_dev - Check if device is linked to an upper device
5248 * @upper_dev: upper device to check
5250 * Find out if a device is linked to specified upper device and return true
5251 * in case it is. Note that this checks only immediate upper device,
5252 * not through a complete stack of devices. The caller must hold the RTNL lock.
5254 bool netdev_has_upper_dev(struct net_device *dev,
5255 struct net_device *upper_dev)
5259 return __netdev_find_adj(upper_dev, &dev->all_adj_list.upper);
5261 EXPORT_SYMBOL(netdev_has_upper_dev);
5264 * netdev_has_any_upper_dev - Check if device is linked to some device
5267 * Find out if a device is linked to an upper device and return true in case
5268 * it is. The caller must hold the RTNL lock.
5270 static bool netdev_has_any_upper_dev(struct net_device *dev)
5274 return !list_empty(&dev->all_adj_list.upper);
5278 * netdev_master_upper_dev_get - Get master upper device
5281 * Find a master upper device and return pointer to it or NULL in case
5282 * it's not there. The caller must hold the RTNL lock.
5284 struct net_device *netdev_master_upper_dev_get(struct net_device *dev)
5286 struct netdev_adjacent *upper;
5290 if (list_empty(&dev->adj_list.upper))
5293 upper = list_first_entry(&dev->adj_list.upper,
5294 struct netdev_adjacent, list);
5295 if (likely(upper->master))
5299 EXPORT_SYMBOL(netdev_master_upper_dev_get);
5301 void *netdev_adjacent_get_private(struct list_head *adj_list)
5303 struct netdev_adjacent *adj;
5305 adj = list_entry(adj_list, struct netdev_adjacent, list);
5307 return adj->private;
5309 EXPORT_SYMBOL(netdev_adjacent_get_private);
5312 * netdev_upper_get_next_dev_rcu - Get the next dev from upper list
5314 * @iter: list_head ** of the current position
5316 * Gets the next device from the dev's upper list, starting from iter
5317 * position. The caller must hold RCU read lock.
5319 struct net_device *netdev_upper_get_next_dev_rcu(struct net_device *dev,
5320 struct list_head **iter)
5322 struct netdev_adjacent *upper;
5324 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held());
5326 upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list);
5328 if (&upper->list == &dev->adj_list.upper)
5331 *iter = &upper->list;
5335 EXPORT_SYMBOL(netdev_upper_get_next_dev_rcu);
5338 * netdev_all_upper_get_next_dev_rcu - Get the next dev from upper list
5340 * @iter: list_head ** of the current position
5342 * Gets the next device from the dev's upper list, starting from iter
5343 * position. The caller must hold RCU read lock.
5345 struct net_device *netdev_all_upper_get_next_dev_rcu(struct net_device *dev,
5346 struct list_head **iter)
5348 struct netdev_adjacent *upper;
5350 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held());
5352 upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list);
5354 if (&upper->list == &dev->all_adj_list.upper)
5357 *iter = &upper->list;
5361 EXPORT_SYMBOL(netdev_all_upper_get_next_dev_rcu);
5364 * netdev_lower_get_next_private - Get the next ->private from the
5365 * lower neighbour list
5367 * @iter: list_head ** of the current position
5369 * Gets the next netdev_adjacent->private from the dev's lower neighbour
5370 * list, starting from iter position. The caller must hold either hold the
5371 * RTNL lock or its own locking that guarantees that the neighbour lower
5372 * list will remain unchanged.
5374 void *netdev_lower_get_next_private(struct net_device *dev,
5375 struct list_head **iter)
5377 struct netdev_adjacent *lower;
5379 lower = list_entry(*iter, struct netdev_adjacent, list);
5381 if (&lower->list == &dev->adj_list.lower)
5384 *iter = lower->list.next;
5386 return lower->private;
5388 EXPORT_SYMBOL(netdev_lower_get_next_private);
5391 * netdev_lower_get_next_private_rcu - Get the next ->private from the
5392 * lower neighbour list, RCU
5395 * @iter: list_head ** of the current position
5397 * Gets the next netdev_adjacent->private from the dev's lower neighbour
5398 * list, starting from iter position. The caller must hold RCU read lock.
5400 void *netdev_lower_get_next_private_rcu(struct net_device *dev,
5401 struct list_head **iter)
5403 struct netdev_adjacent *lower;
5405 WARN_ON_ONCE(!rcu_read_lock_held());
5407 lower = list_entry_rcu((*iter)->next, struct netdev_adjacent, list);
5409 if (&lower->list == &dev->adj_list.lower)
5412 *iter = &lower->list;
5414 return lower->private;
5416 EXPORT_SYMBOL(netdev_lower_get_next_private_rcu);
5419 * netdev_lower_get_next - Get the next device from the lower neighbour
5422 * @iter: list_head ** of the current position
5424 * Gets the next netdev_adjacent from the dev's lower neighbour
5425 * list, starting from iter position. The caller must hold RTNL lock or
5426 * its own locking that guarantees that the neighbour lower
5427 * list will remain unchanged.
5429 void *netdev_lower_get_next(struct net_device *dev, struct list_head **iter)
5431 struct netdev_adjacent *lower;
5433 lower = list_entry(*iter, struct netdev_adjacent, list);
5435 if (&lower->list == &dev->adj_list.lower)
5438 *iter = lower->list.next;
5442 EXPORT_SYMBOL(netdev_lower_get_next);
5445 * netdev_lower_get_first_private_rcu - Get the first ->private from the
5446 * lower neighbour list, RCU
5450 * Gets the first netdev_adjacent->private from the dev's lower neighbour
5451 * list. The caller must hold RCU read lock.
5453 void *netdev_lower_get_first_private_rcu(struct net_device *dev)
5455 struct netdev_adjacent *lower;
5457 lower = list_first_or_null_rcu(&dev->adj_list.lower,
5458 struct netdev_adjacent, list);
5460 return lower->private;
5463 EXPORT_SYMBOL(netdev_lower_get_first_private_rcu);
5466 * netdev_master_upper_dev_get_rcu - Get master upper device
5469 * Find a master upper device and return pointer to it or NULL in case
5470 * it's not there. The caller must hold the RCU read lock.
5472 struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev)
5474 struct netdev_adjacent *upper;
5476 upper = list_first_or_null_rcu(&dev->adj_list.upper,
5477 struct netdev_adjacent, list);
5478 if (upper && likely(upper->master))
5482 EXPORT_SYMBOL(netdev_master_upper_dev_get_rcu);
5484 static int netdev_adjacent_sysfs_add(struct net_device *dev,
5485 struct net_device *adj_dev,
5486 struct list_head *dev_list)
5488 char linkname[IFNAMSIZ+7];
5489 sprintf(linkname, dev_list == &dev->adj_list.upper ?
5490 "upper_%s" : "lower_%s", adj_dev->name);
5491 return sysfs_create_link(&(dev->dev.kobj), &(adj_dev->dev.kobj),
5494 static void netdev_adjacent_sysfs_del(struct net_device *dev,
5496 struct list_head *dev_list)
5498 char linkname[IFNAMSIZ+7];
5499 sprintf(linkname, dev_list == &dev->adj_list.upper ?
5500 "upper_%s" : "lower_%s", name);
5501 sysfs_remove_link(&(dev->dev.kobj), linkname);
5504 static inline bool netdev_adjacent_is_neigh_list(struct net_device *dev,
5505 struct net_device *adj_dev,
5506 struct list_head *dev_list)
5508 return (dev_list == &dev->adj_list.upper ||
5509 dev_list == &dev->adj_list.lower) &&
5510 net_eq(dev_net(dev), dev_net(adj_dev));
5513 static int __netdev_adjacent_dev_insert(struct net_device *dev,
5514 struct net_device *adj_dev,
5515 struct list_head *dev_list,
5516 void *private, bool master)
5518 struct netdev_adjacent *adj;
5521 adj = __netdev_find_adj(adj_dev, dev_list);
5528 adj = kmalloc(sizeof(*adj), GFP_KERNEL);
5533 adj->master = master;
5535 adj->private = private;
5538 pr_debug("dev_hold for %s, because of link added from %s to %s\n",
5539 adj_dev->name, dev->name, adj_dev->name);
5541 if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list)) {
5542 ret = netdev_adjacent_sysfs_add(dev, adj_dev, dev_list);
5547 /* Ensure that master link is always the first item in list. */
5549 ret = sysfs_create_link(&(dev->dev.kobj),
5550 &(adj_dev->dev.kobj), "master");
5552 goto remove_symlinks;
5554 list_add_rcu(&adj->list, dev_list);
5556 list_add_tail_rcu(&adj->list, dev_list);
5562 if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list))
5563 netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list);
5571 static void __netdev_adjacent_dev_remove(struct net_device *dev,
5572 struct net_device *adj_dev,
5573 struct list_head *dev_list)
5575 struct netdev_adjacent *adj;
5577 adj = __netdev_find_adj(adj_dev, dev_list);
5580 pr_err("tried to remove device %s from %s\n",
5581 dev->name, adj_dev->name);
5585 if (adj->ref_nr > 1) {
5586 pr_debug("%s to %s ref_nr-- = %d\n", dev->name, adj_dev->name,
5593 sysfs_remove_link(&(dev->dev.kobj), "master");
5595 if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list))
5596 netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list);
5598 list_del_rcu(&adj->list);
5599 pr_debug("dev_put for %s, because link removed from %s to %s\n",
5600 adj_dev->name, dev->name, adj_dev->name);
5602 kfree_rcu(adj, rcu);
5605 static int __netdev_adjacent_dev_link_lists(struct net_device *dev,
5606 struct net_device *upper_dev,
5607 struct list_head *up_list,
5608 struct list_head *down_list,
5609 void *private, bool master)
5613 ret = __netdev_adjacent_dev_insert(dev, upper_dev, up_list, private,
5618 ret = __netdev_adjacent_dev_insert(upper_dev, dev, down_list, private,
5621 __netdev_adjacent_dev_remove(dev, upper_dev, up_list);
5628 static int __netdev_adjacent_dev_link(struct net_device *dev,
5629 struct net_device *upper_dev)
5631 return __netdev_adjacent_dev_link_lists(dev, upper_dev,
5632 &dev->all_adj_list.upper,
5633 &upper_dev->all_adj_list.lower,
5637 static void __netdev_adjacent_dev_unlink_lists(struct net_device *dev,
5638 struct net_device *upper_dev,
5639 struct list_head *up_list,
5640 struct list_head *down_list)
5642 __netdev_adjacent_dev_remove(dev, upper_dev, up_list);
5643 __netdev_adjacent_dev_remove(upper_dev, dev, down_list);
5646 static void __netdev_adjacent_dev_unlink(struct net_device *dev,
5647 struct net_device *upper_dev)
5649 __netdev_adjacent_dev_unlink_lists(dev, upper_dev,
5650 &dev->all_adj_list.upper,
5651 &upper_dev->all_adj_list.lower);
5654 static int __netdev_adjacent_dev_link_neighbour(struct net_device *dev,
5655 struct net_device *upper_dev,
5656 void *private, bool master)
5658 int ret = __netdev_adjacent_dev_link(dev, upper_dev);
5663 ret = __netdev_adjacent_dev_link_lists(dev, upper_dev,
5664 &dev->adj_list.upper,
5665 &upper_dev->adj_list.lower,
5668 __netdev_adjacent_dev_unlink(dev, upper_dev);
5675 static void __netdev_adjacent_dev_unlink_neighbour(struct net_device *dev,
5676 struct net_device *upper_dev)
5678 __netdev_adjacent_dev_unlink(dev, upper_dev);
5679 __netdev_adjacent_dev_unlink_lists(dev, upper_dev,
5680 &dev->adj_list.upper,
5681 &upper_dev->adj_list.lower);
5684 static int __netdev_upper_dev_link(struct net_device *dev,
5685 struct net_device *upper_dev, bool master,
5686 void *upper_priv, void *upper_info)
5688 struct netdev_notifier_changeupper_info changeupper_info;
5689 struct netdev_adjacent *i, *j, *to_i, *to_j;
5694 if (dev == upper_dev)
5697 /* To prevent loops, check if dev is not upper device to upper_dev. */
5698 if (__netdev_find_adj(dev, &upper_dev->all_adj_list.upper))
5701 if (__netdev_find_adj(upper_dev, &dev->adj_list.upper))
5704 if (master && netdev_master_upper_dev_get(dev))
5707 changeupper_info.upper_dev = upper_dev;
5708 changeupper_info.master = master;
5709 changeupper_info.linking = true;
5710 changeupper_info.upper_info = upper_info;
5712 ret = call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER, dev,
5713 &changeupper_info.info);
5714 ret = notifier_to_errno(ret);
5718 ret = __netdev_adjacent_dev_link_neighbour(dev, upper_dev, upper_priv,
5723 /* Now that we linked these devs, make all the upper_dev's
5724 * all_adj_list.upper visible to every dev's all_adj_list.lower an
5725 * versa, and don't forget the devices itself. All of these
5726 * links are non-neighbours.
5728 list_for_each_entry(i, &dev->all_adj_list.lower, list) {
5729 list_for_each_entry(j, &upper_dev->all_adj_list.upper, list) {
5730 pr_debug("Interlinking %s with %s, non-neighbour\n",
5731 i->dev->name, j->dev->name);
5732 ret = __netdev_adjacent_dev_link(i->dev, j->dev);
5738 /* add dev to every upper_dev's upper device */
5739 list_for_each_entry(i, &upper_dev->all_adj_list.upper, list) {
5740 pr_debug("linking %s's upper device %s with %s\n",
5741 upper_dev->name, i->dev->name, dev->name);
5742 ret = __netdev_adjacent_dev_link(dev, i->dev);
5744 goto rollback_upper_mesh;
5747 /* add upper_dev to every dev's lower device */
5748 list_for_each_entry(i, &dev->all_adj_list.lower, list) {
5749 pr_debug("linking %s's lower device %s with %s\n", dev->name,
5750 i->dev->name, upper_dev->name);
5751 ret = __netdev_adjacent_dev_link(i->dev, upper_dev);
5753 goto rollback_lower_mesh;
5756 ret = call_netdevice_notifiers_info(NETDEV_CHANGEUPPER, dev,
5757 &changeupper_info.info);
5758 ret = notifier_to_errno(ret);
5760 goto rollback_lower_mesh;
5764 rollback_lower_mesh:
5766 list_for_each_entry(i, &dev->all_adj_list.lower, list) {
5769 __netdev_adjacent_dev_unlink(i->dev, upper_dev);
5774 rollback_upper_mesh:
5776 list_for_each_entry(i, &upper_dev->all_adj_list.upper, list) {
5779 __netdev_adjacent_dev_unlink(dev, i->dev);
5787 list_for_each_entry(i, &dev->all_adj_list.lower, list) {
5788 list_for_each_entry(j, &upper_dev->all_adj_list.upper, list) {
5789 if (i == to_i && j == to_j)
5791 __netdev_adjacent_dev_unlink(i->dev, j->dev);
5797 __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev);
5803 * netdev_upper_dev_link - Add a link to the upper device
5805 * @upper_dev: new upper device
5807 * Adds a link to device which is upper to this one. The caller must hold
5808 * the RTNL lock. On a failure a negative errno code is returned.
5809 * On success the reference counts are adjusted and the function
5812 int netdev_upper_dev_link(struct net_device *dev,
5813 struct net_device *upper_dev)
5815 return __netdev_upper_dev_link(dev, upper_dev, false, NULL, NULL);
5817 EXPORT_SYMBOL(netdev_upper_dev_link);
5820 * netdev_master_upper_dev_link - Add a master link to the upper device
5822 * @upper_dev: new upper device
5823 * @upper_priv: upper device private
5824 * @upper_info: upper info to be passed down via notifier
5826 * Adds a link to device which is upper to this one. In this case, only
5827 * one master upper device can be linked, although other non-master devices
5828 * might be linked as well. The caller must hold the RTNL lock.
5829 * On a failure a negative errno code is returned. On success the reference
5830 * counts are adjusted and the function returns zero.
5832 int netdev_master_upper_dev_link(struct net_device *dev,
5833 struct net_device *upper_dev,
5834 void *upper_priv, void *upper_info)
5836 return __netdev_upper_dev_link(dev, upper_dev, true,
5837 upper_priv, upper_info);
5839 EXPORT_SYMBOL(netdev_master_upper_dev_link);
5842 * netdev_upper_dev_unlink - Removes a link to upper device
5844 * @upper_dev: new upper device
5846 * Removes a link to device which is upper to this one. The caller must hold
5849 void netdev_upper_dev_unlink(struct net_device *dev,
5850 struct net_device *upper_dev)
5852 struct netdev_notifier_changeupper_info changeupper_info;
5853 struct netdev_adjacent *i, *j;
5856 changeupper_info.upper_dev = upper_dev;
5857 changeupper_info.master = netdev_master_upper_dev_get(dev) == upper_dev;
5858 changeupper_info.linking = false;
5860 call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER, dev,
5861 &changeupper_info.info);
5863 __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev);
5865 /* Here is the tricky part. We must remove all dev's lower
5866 * devices from all upper_dev's upper devices and vice
5867 * versa, to maintain the graph relationship.
5869 list_for_each_entry(i, &dev->all_adj_list.lower, list)
5870 list_for_each_entry(j, &upper_dev->all_adj_list.upper, list)
5871 __netdev_adjacent_dev_unlink(i->dev, j->dev);
5873 /* remove also the devices itself from lower/upper device
5876 list_for_each_entry(i, &dev->all_adj_list.lower, list)
5877 __netdev_adjacent_dev_unlink(i->dev, upper_dev);
5879 list_for_each_entry(i, &upper_dev->all_adj_list.upper, list)
5880 __netdev_adjacent_dev_unlink(dev, i->dev);
5882 call_netdevice_notifiers_info(NETDEV_CHANGEUPPER, dev,
5883 &changeupper_info.info);
5885 EXPORT_SYMBOL(netdev_upper_dev_unlink);
5888 * netdev_bonding_info_change - Dispatch event about slave change
5890 * @bonding_info: info to dispatch
5892 * Send NETDEV_BONDING_INFO to netdev notifiers with info.
5893 * The caller must hold the RTNL lock.
5895 void netdev_bonding_info_change(struct net_device *dev,
5896 struct netdev_bonding_info *bonding_info)
5898 struct netdev_notifier_bonding_info info;
5900 memcpy(&info.bonding_info, bonding_info,
5901 sizeof(struct netdev_bonding_info));
5902 call_netdevice_notifiers_info(NETDEV_BONDING_INFO, dev,
5905 EXPORT_SYMBOL(netdev_bonding_info_change);
5907 static void netdev_adjacent_add_links(struct net_device *dev)
5909 struct netdev_adjacent *iter;
5911 struct net *net = dev_net(dev);
5913 list_for_each_entry(iter, &dev->adj_list.upper, list) {
5914 if (!net_eq(net,dev_net(iter->dev)))
5916 netdev_adjacent_sysfs_add(iter->dev, dev,
5917 &iter->dev->adj_list.lower);
5918 netdev_adjacent_sysfs_add(dev, iter->dev,
5919 &dev->adj_list.upper);
5922 list_for_each_entry(iter, &dev->adj_list.lower, list) {
5923 if (!net_eq(net,dev_net(iter->dev)))
5925 netdev_adjacent_sysfs_add(iter->dev, dev,
5926 &iter->dev->adj_list.upper);
5927 netdev_adjacent_sysfs_add(dev, iter->dev,
5928 &dev->adj_list.lower);
5932 static void netdev_adjacent_del_links(struct net_device *dev)
5934 struct netdev_adjacent *iter;
5936 struct net *net = dev_net(dev);
5938 list_for_each_entry(iter, &dev->adj_list.upper, list) {
5939 if (!net_eq(net,dev_net(iter->dev)))
5941 netdev_adjacent_sysfs_del(iter->dev, dev->name,
5942 &iter->dev->adj_list.lower);
5943 netdev_adjacent_sysfs_del(dev, iter->dev->name,
5944 &dev->adj_list.upper);
5947 list_for_each_entry(iter, &dev->adj_list.lower, list) {
5948 if (!net_eq(net,dev_net(iter->dev)))
5950 netdev_adjacent_sysfs_del(iter->dev, dev->name,
5951 &iter->dev->adj_list.upper);
5952 netdev_adjacent_sysfs_del(dev, iter->dev->name,
5953 &dev->adj_list.lower);
5957 void netdev_adjacent_rename_links(struct net_device *dev, char *oldname)
5959 struct netdev_adjacent *iter;
5961 struct net *net = dev_net(dev);
5963 list_for_each_entry(iter, &dev->adj_list.upper, list) {
5964 if (!net_eq(net,dev_net(iter->dev)))
5966 netdev_adjacent_sysfs_del(iter->dev, oldname,
5967 &iter->dev->adj_list.lower);
5968 netdev_adjacent_sysfs_add(iter->dev, dev,
5969 &iter->dev->adj_list.lower);
5972 list_for_each_entry(iter, &dev->adj_list.lower, list) {
5973 if (!net_eq(net,dev_net(iter->dev)))
5975 netdev_adjacent_sysfs_del(iter->dev, oldname,
5976 &iter->dev->adj_list.upper);
5977 netdev_adjacent_sysfs_add(iter->dev, dev,
5978 &iter->dev->adj_list.upper);
5982 void *netdev_lower_dev_get_private(struct net_device *dev,
5983 struct net_device *lower_dev)
5985 struct netdev_adjacent *lower;
5989 lower = __netdev_find_adj(lower_dev, &dev->adj_list.lower);
5993 return lower->private;
5995 EXPORT_SYMBOL(netdev_lower_dev_get_private);
5998 int dev_get_nest_level(struct net_device *dev,
5999 bool (*type_check)(const struct net_device *dev))
6001 struct net_device *lower = NULL;
6002 struct list_head *iter;
6008 netdev_for_each_lower_dev(dev, lower, iter) {
6009 nest = dev_get_nest_level(lower, type_check);
6010 if (max_nest < nest)
6014 if (type_check(dev))
6019 EXPORT_SYMBOL(dev_get_nest_level);
6022 * netdev_lower_change - Dispatch event about lower device state change
6023 * @lower_dev: device
6024 * @lower_state_info: state to dispatch
6026 * Send NETDEV_CHANGELOWERSTATE to netdev notifiers with info.
6027 * The caller must hold the RTNL lock.
6029 void netdev_lower_state_changed(struct net_device *lower_dev,
6030 void *lower_state_info)
6032 struct netdev_notifier_changelowerstate_info changelowerstate_info;
6035 changelowerstate_info.lower_state_info = lower_state_info;
6036 call_netdevice_notifiers_info(NETDEV_CHANGELOWERSTATE, lower_dev,
6037 &changelowerstate_info.info);
6039 EXPORT_SYMBOL(netdev_lower_state_changed);
6041 static void dev_change_rx_flags(struct net_device *dev, int flags)
6043 const struct net_device_ops *ops = dev->netdev_ops;
6045 if (ops->ndo_change_rx_flags)
6046 ops->ndo_change_rx_flags(dev, flags);
6049 static int __dev_set_promiscuity(struct net_device *dev, int inc, bool notify)
6051 unsigned int old_flags = dev->flags;
6057 dev->flags |= IFF_PROMISC;
6058 dev->promiscuity += inc;
6059 if (dev->promiscuity == 0) {
6062 * If inc causes overflow, untouch promisc and return error.
6065 dev->flags &= ~IFF_PROMISC;
6067 dev->promiscuity -= inc;
6068 pr_warn("%s: promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n",
6073 if (dev->flags != old_flags) {
6074 pr_info("device %s %s promiscuous mode\n",
6076 dev->flags & IFF_PROMISC ? "entered" : "left");
6077 if (audit_enabled) {
6078 current_uid_gid(&uid, &gid);
6079 audit_log(current->audit_context, GFP_ATOMIC,
6080 AUDIT_ANOM_PROMISCUOUS,
6081 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
6082 dev->name, (dev->flags & IFF_PROMISC),
6083 (old_flags & IFF_PROMISC),
6084 from_kuid(&init_user_ns, audit_get_loginuid(current)),
6085 from_kuid(&init_user_ns, uid),
6086 from_kgid(&init_user_ns, gid),
6087 audit_get_sessionid(current));
6090 dev_change_rx_flags(dev, IFF_PROMISC);
6093 __dev_notify_flags(dev, old_flags, IFF_PROMISC);
6098 * dev_set_promiscuity - update promiscuity count on a device
6102 * Add or remove promiscuity from a device. While the count in the device
6103 * remains above zero the interface remains promiscuous. Once it hits zero
6104 * the device reverts back to normal filtering operation. A negative inc
6105 * value is used to drop promiscuity on the device.
6106 * Return 0 if successful or a negative errno code on error.
6108 int dev_set_promiscuity(struct net_device *dev, int inc)
6110 unsigned int old_flags = dev->flags;
6113 err = __dev_set_promiscuity(dev, inc, true);
6116 if (dev->flags != old_flags)
6117 dev_set_rx_mode(dev);
6120 EXPORT_SYMBOL(dev_set_promiscuity);
6122 static int __dev_set_allmulti(struct net_device *dev, int inc, bool notify)
6124 unsigned int old_flags = dev->flags, old_gflags = dev->gflags;
6128 dev->flags |= IFF_ALLMULTI;
6129 dev->allmulti += inc;
6130 if (dev->allmulti == 0) {
6133 * If inc causes overflow, untouch allmulti and return error.
6136 dev->flags &= ~IFF_ALLMULTI;
6138 dev->allmulti -= inc;
6139 pr_warn("%s: allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n",
6144 if (dev->flags ^ old_flags) {
6145 dev_change_rx_flags(dev, IFF_ALLMULTI);
6146 dev_set_rx_mode(dev);
6148 __dev_notify_flags(dev, old_flags,
6149 dev->gflags ^ old_gflags);
6155 * dev_set_allmulti - update allmulti count on a device
6159 * Add or remove reception of all multicast frames to a device. While the
6160 * count in the device remains above zero the interface remains listening
6161 * to all interfaces. Once it hits zero the device reverts back to normal
6162 * filtering operation. A negative @inc value is used to drop the counter
6163 * when releasing a resource needing all multicasts.
6164 * Return 0 if successful or a negative errno code on error.
6167 int dev_set_allmulti(struct net_device *dev, int inc)
6169 return __dev_set_allmulti(dev, inc, true);
6171 EXPORT_SYMBOL(dev_set_allmulti);
6174 * Upload unicast and multicast address lists to device and
6175 * configure RX filtering. When the device doesn't support unicast
6176 * filtering it is put in promiscuous mode while unicast addresses
6179 void __dev_set_rx_mode(struct net_device *dev)
6181 const struct net_device_ops *ops = dev->netdev_ops;
6183 /* dev_open will call this function so the list will stay sane. */
6184 if (!(dev->flags&IFF_UP))
6187 if (!netif_device_present(dev))
6190 if (!(dev->priv_flags & IFF_UNICAST_FLT)) {
6191 /* Unicast addresses changes may only happen under the rtnl,
6192 * therefore calling __dev_set_promiscuity here is safe.
6194 if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
6195 __dev_set_promiscuity(dev, 1, false);
6196 dev->uc_promisc = true;
6197 } else if (netdev_uc_empty(dev) && dev->uc_promisc) {
6198 __dev_set_promiscuity(dev, -1, false);
6199 dev->uc_promisc = false;
6203 if (ops->ndo_set_rx_mode)
6204 ops->ndo_set_rx_mode(dev);
6207 void dev_set_rx_mode(struct net_device *dev)
6209 netif_addr_lock_bh(dev);
6210 __dev_set_rx_mode(dev);
6211 netif_addr_unlock_bh(dev);
6215 * dev_get_flags - get flags reported to userspace
6218 * Get the combination of flag bits exported through APIs to userspace.
6220 unsigned int dev_get_flags(const struct net_device *dev)
6224 flags = (dev->flags & ~(IFF_PROMISC |
6229 (dev->gflags & (IFF_PROMISC |
6232 if (netif_running(dev)) {
6233 if (netif_oper_up(dev))
6234 flags |= IFF_RUNNING;
6235 if (netif_carrier_ok(dev))
6236 flags |= IFF_LOWER_UP;
6237 if (netif_dormant(dev))
6238 flags |= IFF_DORMANT;
6243 EXPORT_SYMBOL(dev_get_flags);
6245 int __dev_change_flags(struct net_device *dev, unsigned int flags)
6247 unsigned int old_flags = dev->flags;
6253 * Set the flags on our device.
6256 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
6257 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
6259 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
6263 * Load in the correct multicast list now the flags have changed.
6266 if ((old_flags ^ flags) & IFF_MULTICAST)
6267 dev_change_rx_flags(dev, IFF_MULTICAST);
6269 dev_set_rx_mode(dev);
6272 * Have we downed the interface. We handle IFF_UP ourselves
6273 * according to user attempts to set it, rather than blindly
6278 if ((old_flags ^ flags) & IFF_UP)
6279 ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev);
6281 if ((flags ^ dev->gflags) & IFF_PROMISC) {
6282 int inc = (flags & IFF_PROMISC) ? 1 : -1;
6283 unsigned int old_flags = dev->flags;
6285 dev->gflags ^= IFF_PROMISC;
6287 if (__dev_set_promiscuity(dev, inc, false) >= 0)
6288 if (dev->flags != old_flags)
6289 dev_set_rx_mode(dev);
6292 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
6293 is important. Some (broken) drivers set IFF_PROMISC, when
6294 IFF_ALLMULTI is requested not asking us and not reporting.
6296 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
6297 int inc = (flags & IFF_ALLMULTI) ? 1 : -1;
6299 dev->gflags ^= IFF_ALLMULTI;
6300 __dev_set_allmulti(dev, inc, false);
6306 void __dev_notify_flags(struct net_device *dev, unsigned int old_flags,
6307 unsigned int gchanges)
6309 unsigned int changes = dev->flags ^ old_flags;
6312 rtmsg_ifinfo(RTM_NEWLINK, dev, gchanges, GFP_ATOMIC);
6314 if (changes & IFF_UP) {
6315 if (dev->flags & IFF_UP)
6316 call_netdevice_notifiers(NETDEV_UP, dev);
6318 call_netdevice_notifiers(NETDEV_DOWN, dev);
6321 if (dev->flags & IFF_UP &&
6322 (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE))) {
6323 struct netdev_notifier_change_info change_info;
6325 change_info.flags_changed = changes;
6326 call_netdevice_notifiers_info(NETDEV_CHANGE, dev,
6332 * dev_change_flags - change device settings
6334 * @flags: device state flags
6336 * Change settings on device based state flags. The flags are
6337 * in the userspace exported format.
6339 int dev_change_flags(struct net_device *dev, unsigned int flags)
6342 unsigned int changes, old_flags = dev->flags, old_gflags = dev->gflags;
6344 ret = __dev_change_flags(dev, flags);
6348 changes = (old_flags ^ dev->flags) | (old_gflags ^ dev->gflags);
6349 __dev_notify_flags(dev, old_flags, changes);
6352 EXPORT_SYMBOL(dev_change_flags);
6354 static int __dev_set_mtu(struct net_device *dev, int new_mtu)
6356 const struct net_device_ops *ops = dev->netdev_ops;
6358 if (ops->ndo_change_mtu)
6359 return ops->ndo_change_mtu(dev, new_mtu);
6366 * dev_set_mtu - Change maximum transfer unit
6368 * @new_mtu: new transfer unit
6370 * Change the maximum transfer size of the network device.
6372 int dev_set_mtu(struct net_device *dev, int new_mtu)
6376 if (new_mtu == dev->mtu)
6379 /* MTU must be positive. */
6383 if (!netif_device_present(dev))
6386 err = call_netdevice_notifiers(NETDEV_PRECHANGEMTU, dev);
6387 err = notifier_to_errno(err);
6391 orig_mtu = dev->mtu;
6392 err = __dev_set_mtu(dev, new_mtu);
6395 err = call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
6396 err = notifier_to_errno(err);
6398 /* setting mtu back and notifying everyone again,
6399 * so that they have a chance to revert changes.
6401 __dev_set_mtu(dev, orig_mtu);
6402 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
6407 EXPORT_SYMBOL(dev_set_mtu);
6410 * dev_set_group - Change group this device belongs to
6412 * @new_group: group this device should belong to
6414 void dev_set_group(struct net_device *dev, int new_group)
6416 dev->group = new_group;
6418 EXPORT_SYMBOL(dev_set_group);
6421 * dev_set_mac_address - Change Media Access Control Address
6425 * Change the hardware (MAC) address of the device
6427 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
6429 const struct net_device_ops *ops = dev->netdev_ops;
6432 if (!ops->ndo_set_mac_address)
6434 if (sa->sa_family != dev->type)
6436 if (!netif_device_present(dev))
6438 err = ops->ndo_set_mac_address(dev, sa);
6441 dev->addr_assign_type = NET_ADDR_SET;
6442 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
6443 add_device_randomness(dev->dev_addr, dev->addr_len);
6446 EXPORT_SYMBOL(dev_set_mac_address);
6449 * dev_change_carrier - Change device carrier
6451 * @new_carrier: new value
6453 * Change device carrier
6455 int dev_change_carrier(struct net_device *dev, bool new_carrier)
6457 const struct net_device_ops *ops = dev->netdev_ops;
6459 if (!ops->ndo_change_carrier)
6461 if (!netif_device_present(dev))
6463 return ops->ndo_change_carrier(dev, new_carrier);
6465 EXPORT_SYMBOL(dev_change_carrier);
6468 * dev_get_phys_port_id - Get device physical port ID
6472 * Get device physical port ID
6474 int dev_get_phys_port_id(struct net_device *dev,
6475 struct netdev_phys_item_id *ppid)
6477 const struct net_device_ops *ops = dev->netdev_ops;
6479 if (!ops->ndo_get_phys_port_id)
6481 return ops->ndo_get_phys_port_id(dev, ppid);
6483 EXPORT_SYMBOL(dev_get_phys_port_id);
6486 * dev_get_phys_port_name - Get device physical port name
6489 * @len: limit of bytes to copy to name
6491 * Get device physical port name
6493 int dev_get_phys_port_name(struct net_device *dev,
6494 char *name, size_t len)
6496 const struct net_device_ops *ops = dev->netdev_ops;
6498 if (!ops->ndo_get_phys_port_name)
6500 return ops->ndo_get_phys_port_name(dev, name, len);
6502 EXPORT_SYMBOL(dev_get_phys_port_name);
6505 * dev_change_proto_down - update protocol port state information
6507 * @proto_down: new value
6509 * This info can be used by switch drivers to set the phys state of the
6512 int dev_change_proto_down(struct net_device *dev, bool proto_down)
6514 const struct net_device_ops *ops = dev->netdev_ops;
6516 if (!ops->ndo_change_proto_down)
6518 if (!netif_device_present(dev))
6520 return ops->ndo_change_proto_down(dev, proto_down);
6522 EXPORT_SYMBOL(dev_change_proto_down);
6525 * dev_new_index - allocate an ifindex
6526 * @net: the applicable net namespace
6528 * Returns a suitable unique value for a new device interface
6529 * number. The caller must hold the rtnl semaphore or the
6530 * dev_base_lock to be sure it remains unique.
6532 static int dev_new_index(struct net *net)
6534 int ifindex = net->ifindex;
6538 if (!__dev_get_by_index(net, ifindex))
6539 return net->ifindex = ifindex;
6543 /* Delayed registration/unregisteration */
6544 static LIST_HEAD(net_todo_list);
6545 DECLARE_WAIT_QUEUE_HEAD(netdev_unregistering_wq);
6547 static void net_set_todo(struct net_device *dev)
6549 list_add_tail(&dev->todo_list, &net_todo_list);
6550 dev_net(dev)->dev_unreg_count++;
6553 static void rollback_registered_many(struct list_head *head)
6555 struct net_device *dev, *tmp;
6556 LIST_HEAD(close_head);
6558 BUG_ON(dev_boot_phase);
6561 list_for_each_entry_safe(dev, tmp, head, unreg_list) {
6562 /* Some devices call without registering
6563 * for initialization unwind. Remove those
6564 * devices and proceed with the remaining.
6566 if (dev->reg_state == NETREG_UNINITIALIZED) {
6567 pr_debug("unregister_netdevice: device %s/%p never was registered\n",
6571 list_del(&dev->unreg_list);
6574 dev->dismantle = true;
6575 BUG_ON(dev->reg_state != NETREG_REGISTERED);
6578 /* If device is running, close it first. */
6579 list_for_each_entry(dev, head, unreg_list)
6580 list_add_tail(&dev->close_list, &close_head);
6581 dev_close_many(&close_head, true);
6583 list_for_each_entry(dev, head, unreg_list) {
6584 /* And unlink it from device chain. */
6585 unlist_netdevice(dev);
6587 dev->reg_state = NETREG_UNREGISTERING;
6588 on_each_cpu(flush_backlog, dev, 1);
6593 list_for_each_entry(dev, head, unreg_list) {
6594 struct sk_buff *skb = NULL;
6596 /* Shutdown queueing discipline. */
6600 /* Notify protocols, that we are about to destroy
6601 this device. They should clean all the things.
6603 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
6605 if (!dev->rtnl_link_ops ||
6606 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
6607 skb = rtmsg_ifinfo_build_skb(RTM_DELLINK, dev, ~0U,
6611 * Flush the unicast and multicast chains
6616 if (dev->netdev_ops->ndo_uninit)
6617 dev->netdev_ops->ndo_uninit(dev);
6620 rtmsg_ifinfo_send(skb, dev, GFP_KERNEL);
6622 /* Notifier chain MUST detach us all upper devices. */
6623 WARN_ON(netdev_has_any_upper_dev(dev));
6625 /* Remove entries from kobject tree */
6626 netdev_unregister_kobject(dev);
6628 /* Remove XPS queueing entries */
6629 netif_reset_xps_queues_gt(dev, 0);
6635 list_for_each_entry(dev, head, unreg_list)
6639 static void rollback_registered(struct net_device *dev)
6643 list_add(&dev->unreg_list, &single);
6644 rollback_registered_many(&single);
6648 static netdev_features_t netdev_sync_upper_features(struct net_device *lower,
6649 struct net_device *upper, netdev_features_t features)
6651 netdev_features_t upper_disables = NETIF_F_UPPER_DISABLES;
6652 netdev_features_t feature;
6655 for_each_netdev_feature(&upper_disables, feature_bit) {
6656 feature = __NETIF_F_BIT(feature_bit);
6657 if (!(upper->wanted_features & feature)
6658 && (features & feature)) {
6659 netdev_dbg(lower, "Dropping feature %pNF, upper dev %s has it off.\n",
6660 &feature, upper->name);
6661 features &= ~feature;
6668 static void netdev_sync_lower_features(struct net_device *upper,
6669 struct net_device *lower, netdev_features_t features)
6671 netdev_features_t upper_disables = NETIF_F_UPPER_DISABLES;
6672 netdev_features_t feature;
6675 for_each_netdev_feature(&upper_disables, feature_bit) {
6676 feature = __NETIF_F_BIT(feature_bit);
6677 if (!(features & feature) && (lower->features & feature)) {
6678 netdev_dbg(upper, "Disabling feature %pNF on lower dev %s.\n",
6679 &feature, lower->name);
6680 lower->wanted_features &= ~feature;
6681 netdev_update_features(lower);
6683 if (unlikely(lower->features & feature))
6684 netdev_WARN(upper, "failed to disable %pNF on %s!\n",
6685 &feature, lower->name);
6690 static netdev_features_t netdev_fix_features(struct net_device *dev,
6691 netdev_features_t features)
6693 /* Fix illegal checksum combinations */
6694 if ((features & NETIF_F_HW_CSUM) &&
6695 (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
6696 netdev_warn(dev, "mixed HW and IP checksum settings.\n");
6697 features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
6700 /* TSO requires that SG is present as well. */
6701 if ((features & NETIF_F_ALL_TSO) && !(features & NETIF_F_SG)) {
6702 netdev_dbg(dev, "Dropping TSO features since no SG feature.\n");
6703 features &= ~NETIF_F_ALL_TSO;
6706 if ((features & NETIF_F_TSO) && !(features & NETIF_F_HW_CSUM) &&
6707 !(features & NETIF_F_IP_CSUM)) {
6708 netdev_dbg(dev, "Dropping TSO features since no CSUM feature.\n");
6709 features &= ~NETIF_F_TSO;
6710 features &= ~NETIF_F_TSO_ECN;
6713 if ((features & NETIF_F_TSO6) && !(features & NETIF_F_HW_CSUM) &&
6714 !(features & NETIF_F_IPV6_CSUM)) {
6715 netdev_dbg(dev, "Dropping TSO6 features since no CSUM feature.\n");
6716 features &= ~NETIF_F_TSO6;
6719 /* TSO with IPv4 ID mangling requires IPv4 TSO be enabled */
6720 if ((features & NETIF_F_TSO_MANGLEID) && !(features & NETIF_F_TSO))
6721 features &= ~NETIF_F_TSO_MANGLEID;
6723 /* TSO ECN requires that TSO is present as well. */
6724 if ((features & NETIF_F_ALL_TSO) == NETIF_F_TSO_ECN)
6725 features &= ~NETIF_F_TSO_ECN;
6727 /* Software GSO depends on SG. */
6728 if ((features & NETIF_F_GSO) && !(features & NETIF_F_SG)) {
6729 netdev_dbg(dev, "Dropping NETIF_F_GSO since no SG feature.\n");
6730 features &= ~NETIF_F_GSO;
6733 /* UFO needs SG and checksumming */
6734 if (features & NETIF_F_UFO) {
6735 /* maybe split UFO into V4 and V6? */
6736 if (!(features & NETIF_F_HW_CSUM) &&
6737 ((features & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM)) !=
6738 (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM))) {
6740 "Dropping NETIF_F_UFO since no checksum offload features.\n");
6741 features &= ~NETIF_F_UFO;
6744 if (!(features & NETIF_F_SG)) {
6746 "Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n");
6747 features &= ~NETIF_F_UFO;
6751 /* GSO partial features require GSO partial be set */
6752 if ((features & dev->gso_partial_features) &&
6753 !(features & NETIF_F_GSO_PARTIAL)) {
6755 "Dropping partially supported GSO features since no GSO partial.\n");
6756 features &= ~dev->gso_partial_features;
6759 #ifdef CONFIG_NET_RX_BUSY_POLL
6760 if (dev->netdev_ops->ndo_busy_poll)
6761 features |= NETIF_F_BUSY_POLL;
6764 features &= ~NETIF_F_BUSY_POLL;
6769 int __netdev_update_features(struct net_device *dev)
6771 struct net_device *upper, *lower;
6772 netdev_features_t features;
6773 struct list_head *iter;
6778 features = netdev_get_wanted_features(dev);
6780 if (dev->netdev_ops->ndo_fix_features)
6781 features = dev->netdev_ops->ndo_fix_features(dev, features);
6783 /* driver might be less strict about feature dependencies */
6784 features = netdev_fix_features(dev, features);
6786 /* some features can't be enabled if they're off an an upper device */
6787 netdev_for_each_upper_dev_rcu(dev, upper, iter)
6788 features = netdev_sync_upper_features(dev, upper, features);
6790 if (dev->features == features)
6793 netdev_dbg(dev, "Features changed: %pNF -> %pNF\n",
6794 &dev->features, &features);
6796 if (dev->netdev_ops->ndo_set_features)
6797 err = dev->netdev_ops->ndo_set_features(dev, features);
6801 if (unlikely(err < 0)) {
6803 "set_features() failed (%d); wanted %pNF, left %pNF\n",
6804 err, &features, &dev->features);
6805 /* return non-0 since some features might have changed and
6806 * it's better to fire a spurious notification than miss it
6812 /* some features must be disabled on lower devices when disabled
6813 * on an upper device (think: bonding master or bridge)
6815 netdev_for_each_lower_dev(dev, lower, iter)
6816 netdev_sync_lower_features(dev, lower, features);
6819 dev->features = features;
6821 return err < 0 ? 0 : 1;
6825 * netdev_update_features - recalculate device features
6826 * @dev: the device to check
6828 * Recalculate dev->features set and send notifications if it
6829 * has changed. Should be called after driver or hardware dependent
6830 * conditions might have changed that influence the features.
6832 void netdev_update_features(struct net_device *dev)
6834 if (__netdev_update_features(dev))
6835 netdev_features_change(dev);
6837 EXPORT_SYMBOL(netdev_update_features);
6840 * netdev_change_features - recalculate device features
6841 * @dev: the device to check
6843 * Recalculate dev->features set and send notifications even
6844 * if they have not changed. Should be called instead of
6845 * netdev_update_features() if also dev->vlan_features might
6846 * have changed to allow the changes to be propagated to stacked
6849 void netdev_change_features(struct net_device *dev)
6851 __netdev_update_features(dev);
6852 netdev_features_change(dev);
6854 EXPORT_SYMBOL(netdev_change_features);
6857 * netif_stacked_transfer_operstate - transfer operstate
6858 * @rootdev: the root or lower level device to transfer state from
6859 * @dev: the device to transfer operstate to
6861 * Transfer operational state from root to device. This is normally
6862 * called when a stacking relationship exists between the root
6863 * device and the device(a leaf device).
6865 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
6866 struct net_device *dev)
6868 if (rootdev->operstate == IF_OPER_DORMANT)
6869 netif_dormant_on(dev);
6871 netif_dormant_off(dev);
6873 if (netif_carrier_ok(rootdev)) {
6874 if (!netif_carrier_ok(dev))
6875 netif_carrier_on(dev);
6877 if (netif_carrier_ok(dev))
6878 netif_carrier_off(dev);
6881 EXPORT_SYMBOL(netif_stacked_transfer_operstate);
6884 static int netif_alloc_rx_queues(struct net_device *dev)
6886 unsigned int i, count = dev->num_rx_queues;
6887 struct netdev_rx_queue *rx;
6888 size_t sz = count * sizeof(*rx);
6892 rx = kzalloc(sz, GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
6900 for (i = 0; i < count; i++)
6906 static void netdev_init_one_queue(struct net_device *dev,
6907 struct netdev_queue *queue, void *_unused)
6909 /* Initialize queue lock */
6910 spin_lock_init(&queue->_xmit_lock);
6911 netdev_set_xmit_lockdep_class(&queue->_xmit_lock, dev->type);
6912 queue->xmit_lock_owner = -1;
6913 netdev_queue_numa_node_write(queue, NUMA_NO_NODE);
6916 dql_init(&queue->dql, HZ);
6920 static void netif_free_tx_queues(struct net_device *dev)
6925 static int netif_alloc_netdev_queues(struct net_device *dev)
6927 unsigned int count = dev->num_tx_queues;
6928 struct netdev_queue *tx;
6929 size_t sz = count * sizeof(*tx);
6931 if (count < 1 || count > 0xffff)
6934 tx = kzalloc(sz, GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
6942 netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
6943 spin_lock_init(&dev->tx_global_lock);
6948 void netif_tx_stop_all_queues(struct net_device *dev)
6952 for (i = 0; i < dev->num_tx_queues; i++) {
6953 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
6954 netif_tx_stop_queue(txq);
6957 EXPORT_SYMBOL(netif_tx_stop_all_queues);
6960 * register_netdevice - register a network device
6961 * @dev: device to register
6963 * Take a completed network device structure and add it to the kernel
6964 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
6965 * chain. 0 is returned on success. A negative errno code is returned
6966 * on a failure to set up the device, or if the name is a duplicate.
6968 * Callers must hold the rtnl semaphore. You may want
6969 * register_netdev() instead of this.
6972 * The locking appears insufficient to guarantee two parallel registers
6973 * will not get the same name.
6976 int register_netdevice(struct net_device *dev)
6979 struct net *net = dev_net(dev);
6981 BUG_ON(dev_boot_phase);
6986 /* When net_device's are persistent, this will be fatal. */
6987 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
6990 spin_lock_init(&dev->addr_list_lock);
6991 netdev_set_addr_lockdep_class(dev);
6993 ret = dev_get_valid_name(net, dev, dev->name);
6997 /* Init, if this function is available */
6998 if (dev->netdev_ops->ndo_init) {
6999 ret = dev->netdev_ops->ndo_init(dev);
7007 if (((dev->hw_features | dev->features) &
7008 NETIF_F_HW_VLAN_CTAG_FILTER) &&
7009 (!dev->netdev_ops->ndo_vlan_rx_add_vid ||
7010 !dev->netdev_ops->ndo_vlan_rx_kill_vid)) {
7011 netdev_WARN(dev, "Buggy VLAN acceleration in driver!\n");
7018 dev->ifindex = dev_new_index(net);
7019 else if (__dev_get_by_index(net, dev->ifindex))
7022 /* Transfer changeable features to wanted_features and enable
7023 * software offloads (GSO and GRO).
7025 dev->hw_features |= NETIF_F_SOFT_FEATURES;
7026 dev->features |= NETIF_F_SOFT_FEATURES;
7027 dev->wanted_features = dev->features & dev->hw_features;
7029 if (!(dev->flags & IFF_LOOPBACK))
7030 dev->hw_features |= NETIF_F_NOCACHE_COPY;
7032 /* If IPv4 TCP segmentation offload is supported we should also
7033 * allow the device to enable segmenting the frame with the option
7034 * of ignoring a static IP ID value. This doesn't enable the
7035 * feature itself but allows the user to enable it later.
7037 if (dev->hw_features & NETIF_F_TSO)
7038 dev->hw_features |= NETIF_F_TSO_MANGLEID;
7039 if (dev->vlan_features & NETIF_F_TSO)
7040 dev->vlan_features |= NETIF_F_TSO_MANGLEID;
7041 if (dev->mpls_features & NETIF_F_TSO)
7042 dev->mpls_features |= NETIF_F_TSO_MANGLEID;
7043 if (dev->hw_enc_features & NETIF_F_TSO)
7044 dev->hw_enc_features |= NETIF_F_TSO_MANGLEID;
7046 /* Make NETIF_F_HIGHDMA inheritable to VLAN devices.
7048 dev->vlan_features |= NETIF_F_HIGHDMA;
7050 /* Make NETIF_F_SG inheritable to tunnel devices.
7052 dev->hw_enc_features |= NETIF_F_SG | NETIF_F_GSO_PARTIAL;
7054 /* Make NETIF_F_SG inheritable to MPLS.
7056 dev->mpls_features |= NETIF_F_SG;
7058 ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
7059 ret = notifier_to_errno(ret);
7063 ret = netdev_register_kobject(dev);
7066 dev->reg_state = NETREG_REGISTERED;
7068 __netdev_update_features(dev);
7071 * Default initial state at registry is that the
7072 * device is present.
7075 set_bit(__LINK_STATE_PRESENT, &dev->state);
7077 linkwatch_init_dev(dev);
7079 dev_init_scheduler(dev);
7081 list_netdevice(dev);
7082 add_device_randomness(dev->dev_addr, dev->addr_len);
7084 /* If the device has permanent device address, driver should
7085 * set dev_addr and also addr_assign_type should be set to
7086 * NET_ADDR_PERM (default value).
7088 if (dev->addr_assign_type == NET_ADDR_PERM)
7089 memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len);
7091 /* Notify protocols, that a new device appeared. */
7092 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
7093 ret = notifier_to_errno(ret);
7095 rollback_registered(dev);
7096 dev->reg_state = NETREG_UNREGISTERED;
7099 * Prevent userspace races by waiting until the network
7100 * device is fully setup before sending notifications.
7102 if (!dev->rtnl_link_ops ||
7103 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
7104 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL);
7110 if (dev->netdev_ops->ndo_uninit)
7111 dev->netdev_ops->ndo_uninit(dev);
7114 EXPORT_SYMBOL(register_netdevice);
7117 * init_dummy_netdev - init a dummy network device for NAPI
7118 * @dev: device to init
7120 * This takes a network device structure and initialize the minimum
7121 * amount of fields so it can be used to schedule NAPI polls without
7122 * registering a full blown interface. This is to be used by drivers
7123 * that need to tie several hardware interfaces to a single NAPI
7124 * poll scheduler due to HW limitations.
7126 int init_dummy_netdev(struct net_device *dev)
7128 /* Clear everything. Note we don't initialize spinlocks
7129 * are they aren't supposed to be taken by any of the
7130 * NAPI code and this dummy netdev is supposed to be
7131 * only ever used for NAPI polls
7133 memset(dev, 0, sizeof(struct net_device));
7135 /* make sure we BUG if trying to hit standard
7136 * register/unregister code path
7138 dev->reg_state = NETREG_DUMMY;
7140 /* NAPI wants this */
7141 INIT_LIST_HEAD(&dev->napi_list);
7143 /* a dummy interface is started by default */
7144 set_bit(__LINK_STATE_PRESENT, &dev->state);
7145 set_bit(__LINK_STATE_START, &dev->state);
7147 /* Note : We dont allocate pcpu_refcnt for dummy devices,
7148 * because users of this 'device' dont need to change
7154 EXPORT_SYMBOL_GPL(init_dummy_netdev);
7158 * register_netdev - register a network device
7159 * @dev: device to register
7161 * Take a completed network device structure and add it to the kernel
7162 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
7163 * chain. 0 is returned on success. A negative errno code is returned
7164 * on a failure to set up the device, or if the name is a duplicate.
7166 * This is a wrapper around register_netdevice that takes the rtnl semaphore
7167 * and expands the device name if you passed a format string to
7170 int register_netdev(struct net_device *dev)
7175 err = register_netdevice(dev);
7179 EXPORT_SYMBOL(register_netdev);
7181 int netdev_refcnt_read(const struct net_device *dev)
7185 for_each_possible_cpu(i)
7186 refcnt += *per_cpu_ptr(dev->pcpu_refcnt, i);
7189 EXPORT_SYMBOL(netdev_refcnt_read);
7192 * netdev_wait_allrefs - wait until all references are gone.
7193 * @dev: target net_device
7195 * This is called when unregistering network devices.
7197 * Any protocol or device that holds a reference should register
7198 * for netdevice notification, and cleanup and put back the
7199 * reference if they receive an UNREGISTER event.
7200 * We can get stuck here if buggy protocols don't correctly
7203 static void netdev_wait_allrefs(struct net_device *dev)
7205 unsigned long rebroadcast_time, warning_time;
7208 linkwatch_forget_dev(dev);
7210 rebroadcast_time = warning_time = jiffies;
7211 refcnt = netdev_refcnt_read(dev);
7213 while (refcnt != 0) {
7214 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
7217 /* Rebroadcast unregister notification */
7218 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
7224 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev);
7225 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
7227 /* We must not have linkwatch events
7228 * pending on unregister. If this
7229 * happens, we simply run the queue
7230 * unscheduled, resulting in a noop
7233 linkwatch_run_queue();
7238 rebroadcast_time = jiffies;
7243 refcnt = netdev_refcnt_read(dev);
7245 if (time_after(jiffies, warning_time + 10 * HZ)) {
7246 pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n",
7248 warning_time = jiffies;
7257 * register_netdevice(x1);
7258 * register_netdevice(x2);
7260 * unregister_netdevice(y1);
7261 * unregister_netdevice(y2);
7267 * We are invoked by rtnl_unlock().
7268 * This allows us to deal with problems:
7269 * 1) We can delete sysfs objects which invoke hotplug
7270 * without deadlocking with linkwatch via keventd.
7271 * 2) Since we run with the RTNL semaphore not held, we can sleep
7272 * safely in order to wait for the netdev refcnt to drop to zero.
7274 * We must not return until all unregister events added during
7275 * the interval the lock was held have been completed.
7277 void netdev_run_todo(void)
7279 struct list_head list;
7281 /* Snapshot list, allow later requests */
7282 list_replace_init(&net_todo_list, &list);
7287 /* Wait for rcu callbacks to finish before next phase */
7288 if (!list_empty(&list))
7291 while (!list_empty(&list)) {
7292 struct net_device *dev
7293 = list_first_entry(&list, struct net_device, todo_list);
7294 list_del(&dev->todo_list);
7297 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev);
7300 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
7301 pr_err("network todo '%s' but state %d\n",
7302 dev->name, dev->reg_state);
7307 dev->reg_state = NETREG_UNREGISTERED;
7309 netdev_wait_allrefs(dev);
7312 BUG_ON(netdev_refcnt_read(dev));
7313 BUG_ON(!list_empty(&dev->ptype_all));
7314 BUG_ON(!list_empty(&dev->ptype_specific));
7315 WARN_ON(rcu_access_pointer(dev->ip_ptr));
7316 WARN_ON(rcu_access_pointer(dev->ip6_ptr));
7317 WARN_ON(dev->dn_ptr);
7319 if (dev->destructor)
7320 dev->destructor(dev);
7322 /* Report a network device has been unregistered */
7324 dev_net(dev)->dev_unreg_count--;
7326 wake_up(&netdev_unregistering_wq);
7328 /* Free network device */
7329 kobject_put(&dev->dev.kobj);
7333 /* Convert net_device_stats to rtnl_link_stats64. rtnl_link_stats64 has
7334 * all the same fields in the same order as net_device_stats, with only
7335 * the type differing, but rtnl_link_stats64 may have additional fields
7336 * at the end for newer counters.
7338 void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
7339 const struct net_device_stats *netdev_stats)
7341 #if BITS_PER_LONG == 64
7342 BUILD_BUG_ON(sizeof(*stats64) < sizeof(*netdev_stats));
7343 memcpy(stats64, netdev_stats, sizeof(*stats64));
7344 /* zero out counters that only exist in rtnl_link_stats64 */
7345 memset((char *)stats64 + sizeof(*netdev_stats), 0,
7346 sizeof(*stats64) - sizeof(*netdev_stats));
7348 size_t i, n = sizeof(*netdev_stats) / sizeof(unsigned long);
7349 const unsigned long *src = (const unsigned long *)netdev_stats;
7350 u64 *dst = (u64 *)stats64;
7352 BUILD_BUG_ON(n > sizeof(*stats64) / sizeof(u64));
7353 for (i = 0; i < n; i++)
7355 /* zero out counters that only exist in rtnl_link_stats64 */
7356 memset((char *)stats64 + n * sizeof(u64), 0,
7357 sizeof(*stats64) - n * sizeof(u64));
7360 EXPORT_SYMBOL(netdev_stats_to_stats64);
7363 * dev_get_stats - get network device statistics
7364 * @dev: device to get statistics from
7365 * @storage: place to store stats
7367 * Get network statistics from device. Return @storage.
7368 * The device driver may provide its own method by setting
7369 * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
7370 * otherwise the internal statistics structure is used.
7372 struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
7373 struct rtnl_link_stats64 *storage)
7375 const struct net_device_ops *ops = dev->netdev_ops;
7377 if (ops->ndo_get_stats64) {
7378 memset(storage, 0, sizeof(*storage));
7379 ops->ndo_get_stats64(dev, storage);
7380 } else if (ops->ndo_get_stats) {
7381 netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev));
7383 netdev_stats_to_stats64(storage, &dev->stats);
7385 storage->rx_dropped += atomic_long_read(&dev->rx_dropped);
7386 storage->tx_dropped += atomic_long_read(&dev->tx_dropped);
7387 storage->rx_nohandler += atomic_long_read(&dev->rx_nohandler);
7390 EXPORT_SYMBOL(dev_get_stats);
7392 struct netdev_queue *dev_ingress_queue_create(struct net_device *dev)
7394 struct netdev_queue *queue = dev_ingress_queue(dev);
7396 #ifdef CONFIG_NET_CLS_ACT
7399 queue = kzalloc(sizeof(*queue), GFP_KERNEL);
7402 netdev_init_one_queue(dev, queue, NULL);
7403 RCU_INIT_POINTER(queue->qdisc, &noop_qdisc);
7404 queue->qdisc_sleeping = &noop_qdisc;
7405 rcu_assign_pointer(dev->ingress_queue, queue);
7410 static const struct ethtool_ops default_ethtool_ops;
7412 void netdev_set_default_ethtool_ops(struct net_device *dev,
7413 const struct ethtool_ops *ops)
7415 if (dev->ethtool_ops == &default_ethtool_ops)
7416 dev->ethtool_ops = ops;
7418 EXPORT_SYMBOL_GPL(netdev_set_default_ethtool_ops);
7420 void netdev_freemem(struct net_device *dev)
7422 char *addr = (char *)dev - dev->padded;
7428 * alloc_netdev_mqs - allocate network device
7429 * @sizeof_priv: size of private data to allocate space for
7430 * @name: device name format string
7431 * @name_assign_type: origin of device name
7432 * @setup: callback to initialize device
7433 * @txqs: the number of TX subqueues to allocate
7434 * @rxqs: the number of RX subqueues to allocate
7436 * Allocates a struct net_device with private data area for driver use
7437 * and performs basic initialization. Also allocates subqueue structs
7438 * for each queue on the device.
7440 struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
7441 unsigned char name_assign_type,
7442 void (*setup)(struct net_device *),
7443 unsigned int txqs, unsigned int rxqs)
7445 struct net_device *dev;
7447 struct net_device *p;
7449 BUG_ON(strlen(name) >= sizeof(dev->name));
7452 pr_err("alloc_netdev: Unable to allocate device with zero queues\n");
7458 pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n");
7463 alloc_size = sizeof(struct net_device);
7465 /* ensure 32-byte alignment of private area */
7466 alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
7467 alloc_size += sizeof_priv;
7469 /* ensure 32-byte alignment of whole construct */
7470 alloc_size += NETDEV_ALIGN - 1;
7472 p = kzalloc(alloc_size, GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
7474 p = vzalloc(alloc_size);
7478 dev = PTR_ALIGN(p, NETDEV_ALIGN);
7479 dev->padded = (char *)dev - (char *)p;
7481 dev->pcpu_refcnt = alloc_percpu(int);
7482 if (!dev->pcpu_refcnt)
7485 if (dev_addr_init(dev))
7491 dev_net_set(dev, &init_net);
7493 dev->gso_max_size = GSO_MAX_SIZE;
7494 dev->gso_max_segs = GSO_MAX_SEGS;
7496 INIT_LIST_HEAD(&dev->napi_list);
7497 INIT_LIST_HEAD(&dev->unreg_list);
7498 INIT_LIST_HEAD(&dev->close_list);
7499 INIT_LIST_HEAD(&dev->link_watch_list);
7500 INIT_LIST_HEAD(&dev->adj_list.upper);
7501 INIT_LIST_HEAD(&dev->adj_list.lower);
7502 INIT_LIST_HEAD(&dev->all_adj_list.upper);
7503 INIT_LIST_HEAD(&dev->all_adj_list.lower);
7504 INIT_LIST_HEAD(&dev->ptype_all);
7505 INIT_LIST_HEAD(&dev->ptype_specific);
7506 dev->priv_flags = IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM;
7509 if (!dev->tx_queue_len) {
7510 dev->priv_flags |= IFF_NO_QUEUE;
7511 dev->tx_queue_len = 1;
7514 dev->num_tx_queues = txqs;
7515 dev->real_num_tx_queues = txqs;
7516 if (netif_alloc_netdev_queues(dev))
7520 dev->num_rx_queues = rxqs;
7521 dev->real_num_rx_queues = rxqs;
7522 if (netif_alloc_rx_queues(dev))
7526 strcpy(dev->name, name);
7527 dev->name_assign_type = name_assign_type;
7528 dev->group = INIT_NETDEV_GROUP;
7529 if (!dev->ethtool_ops)
7530 dev->ethtool_ops = &default_ethtool_ops;
7532 nf_hook_ingress_init(dev);
7541 free_percpu(dev->pcpu_refcnt);
7543 netdev_freemem(dev);
7546 EXPORT_SYMBOL(alloc_netdev_mqs);
7549 * free_netdev - free network device
7552 * This function does the last stage of destroying an allocated device
7553 * interface. The reference to the device object is released.
7554 * If this is the last reference then it will be freed.
7555 * Must be called in process context.
7557 void free_netdev(struct net_device *dev)
7559 struct napi_struct *p, *n;
7562 netif_free_tx_queues(dev);
7567 kfree(rcu_dereference_protected(dev->ingress_queue, 1));
7569 /* Flush device addresses */
7570 dev_addr_flush(dev);
7572 list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
7575 free_percpu(dev->pcpu_refcnt);
7576 dev->pcpu_refcnt = NULL;
7578 /* Compatibility with error handling in drivers */
7579 if (dev->reg_state == NETREG_UNINITIALIZED) {
7580 netdev_freemem(dev);
7584 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
7585 dev->reg_state = NETREG_RELEASED;
7587 /* will free via device release */
7588 put_device(&dev->dev);
7590 EXPORT_SYMBOL(free_netdev);
7593 * synchronize_net - Synchronize with packet receive processing
7595 * Wait for packets currently being received to be done.
7596 * Does not block later packets from starting.
7598 void synchronize_net(void)
7601 if (rtnl_is_locked())
7602 synchronize_rcu_expedited();
7606 EXPORT_SYMBOL(synchronize_net);
7609 * unregister_netdevice_queue - remove device from the kernel
7613 * This function shuts down a device interface and removes it
7614 * from the kernel tables.
7615 * If head not NULL, device is queued to be unregistered later.
7617 * Callers must hold the rtnl semaphore. You may want
7618 * unregister_netdev() instead of this.
7621 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
7626 list_move_tail(&dev->unreg_list, head);
7628 rollback_registered(dev);
7629 /* Finish processing unregister after unlock */
7633 EXPORT_SYMBOL(unregister_netdevice_queue);
7636 * unregister_netdevice_many - unregister many devices
7637 * @head: list of devices
7639 * Note: As most callers use a stack allocated list_head,
7640 * we force a list_del() to make sure stack wont be corrupted later.
7642 void unregister_netdevice_many(struct list_head *head)
7644 struct net_device *dev;
7646 if (!list_empty(head)) {
7647 rollback_registered_many(head);
7648 list_for_each_entry(dev, head, unreg_list)
7653 EXPORT_SYMBOL(unregister_netdevice_many);
7656 * unregister_netdev - remove device from the kernel
7659 * This function shuts down a device interface and removes it
7660 * from the kernel tables.
7662 * This is just a wrapper for unregister_netdevice that takes
7663 * the rtnl semaphore. In general you want to use this and not
7664 * unregister_netdevice.
7666 void unregister_netdev(struct net_device *dev)
7669 unregister_netdevice(dev);
7672 EXPORT_SYMBOL(unregister_netdev);
7675 * dev_change_net_namespace - move device to different nethost namespace
7677 * @net: network namespace
7678 * @pat: If not NULL name pattern to try if the current device name
7679 * is already taken in the destination network namespace.
7681 * This function shuts down a device interface and moves it
7682 * to a new network namespace. On success 0 is returned, on
7683 * a failure a netagive errno code is returned.
7685 * Callers must hold the rtnl semaphore.
7688 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
7694 /* Don't allow namespace local devices to be moved. */
7696 if (dev->features & NETIF_F_NETNS_LOCAL)
7699 /* Ensure the device has been registrered */
7700 if (dev->reg_state != NETREG_REGISTERED)
7703 /* Get out if there is nothing todo */
7705 if (net_eq(dev_net(dev), net))
7708 /* Pick the destination device name, and ensure
7709 * we can use it in the destination network namespace.
7712 if (__dev_get_by_name(net, dev->name)) {
7713 /* We get here if we can't use the current device name */
7716 if (dev_get_valid_name(net, dev, pat) < 0)
7721 * And now a mini version of register_netdevice unregister_netdevice.
7724 /* If device is running close it first. */
7727 /* And unlink it from device chain */
7729 unlist_netdevice(dev);
7733 /* Shutdown queueing discipline. */
7736 /* Notify protocols, that we are about to destroy
7737 this device. They should clean all the things.
7739 Note that dev->reg_state stays at NETREG_REGISTERED.
7740 This is wanted because this way 8021q and macvlan know
7741 the device is just moving and can keep their slaves up.
7743 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
7745 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev);
7746 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U, GFP_KERNEL);
7749 * Flush the unicast and multicast chains
7754 /* Send a netdev-removed uevent to the old namespace */
7755 kobject_uevent(&dev->dev.kobj, KOBJ_REMOVE);
7756 netdev_adjacent_del_links(dev);
7758 /* Actually switch the network namespace */
7759 dev_net_set(dev, net);
7761 /* If there is an ifindex conflict assign a new one */
7762 if (__dev_get_by_index(net, dev->ifindex))
7763 dev->ifindex = dev_new_index(net);
7765 /* Send a netdev-add uevent to the new namespace */
7766 kobject_uevent(&dev->dev.kobj, KOBJ_ADD);
7767 netdev_adjacent_add_links(dev);
7769 /* Fixup kobjects */
7770 err = device_rename(&dev->dev, dev->name);
7773 /* Add the device back in the hashes */
7774 list_netdevice(dev);
7776 /* Notify protocols, that a new device appeared. */
7777 call_netdevice_notifiers(NETDEV_REGISTER, dev);
7780 * Prevent userspace races by waiting until the network
7781 * device is fully setup before sending notifications.
7783 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL);
7790 EXPORT_SYMBOL_GPL(dev_change_net_namespace);
7792 static int dev_cpu_callback(struct notifier_block *nfb,
7793 unsigned long action,
7796 struct sk_buff **list_skb;
7797 struct sk_buff *skb;
7798 unsigned int cpu, oldcpu = (unsigned long)ocpu;
7799 struct softnet_data *sd, *oldsd;
7801 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
7804 local_irq_disable();
7805 cpu = smp_processor_id();
7806 sd = &per_cpu(softnet_data, cpu);
7807 oldsd = &per_cpu(softnet_data, oldcpu);
7809 /* Find end of our completion_queue. */
7810 list_skb = &sd->completion_queue;
7812 list_skb = &(*list_skb)->next;
7813 /* Append completion queue from offline CPU. */
7814 *list_skb = oldsd->completion_queue;
7815 oldsd->completion_queue = NULL;
7817 /* Append output queue from offline CPU. */
7818 if (oldsd->output_queue) {
7819 *sd->output_queue_tailp = oldsd->output_queue;
7820 sd->output_queue_tailp = oldsd->output_queue_tailp;
7821 oldsd->output_queue = NULL;
7822 oldsd->output_queue_tailp = &oldsd->output_queue;
7824 /* Append NAPI poll list from offline CPU, with one exception :
7825 * process_backlog() must be called by cpu owning percpu backlog.
7826 * We properly handle process_queue & input_pkt_queue later.
7828 while (!list_empty(&oldsd->poll_list)) {
7829 struct napi_struct *napi = list_first_entry(&oldsd->poll_list,
7833 list_del_init(&napi->poll_list);
7834 if (napi->poll == process_backlog)
7837 ____napi_schedule(sd, napi);
7840 raise_softirq_irqoff(NET_TX_SOFTIRQ);
7843 /* Process offline CPU's input_pkt_queue */
7844 while ((skb = __skb_dequeue(&oldsd->process_queue))) {
7846 input_queue_head_incr(oldsd);
7848 while ((skb = skb_dequeue(&oldsd->input_pkt_queue))) {
7850 input_queue_head_incr(oldsd);
7858 * netdev_increment_features - increment feature set by one
7859 * @all: current feature set
7860 * @one: new feature set
7861 * @mask: mask feature set
7863 * Computes a new feature set after adding a device with feature set
7864 * @one to the master device with current feature set @all. Will not
7865 * enable anything that is off in @mask. Returns the new feature set.
7867 netdev_features_t netdev_increment_features(netdev_features_t all,
7868 netdev_features_t one, netdev_features_t mask)
7870 if (mask & NETIF_F_HW_CSUM)
7871 mask |= NETIF_F_CSUM_MASK;
7872 mask |= NETIF_F_VLAN_CHALLENGED;
7874 all |= one & (NETIF_F_ONE_FOR_ALL | NETIF_F_CSUM_MASK) & mask;
7875 all &= one | ~NETIF_F_ALL_FOR_ALL;
7877 /* If one device supports hw checksumming, set for all. */
7878 if (all & NETIF_F_HW_CSUM)
7879 all &= ~(NETIF_F_CSUM_MASK & ~NETIF_F_HW_CSUM);
7883 EXPORT_SYMBOL(netdev_increment_features);
7885 static struct hlist_head * __net_init netdev_create_hash(void)
7888 struct hlist_head *hash;
7890 hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
7892 for (i = 0; i < NETDEV_HASHENTRIES; i++)
7893 INIT_HLIST_HEAD(&hash[i]);
7898 /* Initialize per network namespace state */
7899 static int __net_init netdev_init(struct net *net)
7901 if (net != &init_net)
7902 INIT_LIST_HEAD(&net->dev_base_head);
7904 net->dev_name_head = netdev_create_hash();
7905 if (net->dev_name_head == NULL)
7908 net->dev_index_head = netdev_create_hash();
7909 if (net->dev_index_head == NULL)
7915 kfree(net->dev_name_head);
7921 * netdev_drivername - network driver for the device
7922 * @dev: network device
7924 * Determine network driver for device.
7926 const char *netdev_drivername(const struct net_device *dev)
7928 const struct device_driver *driver;
7929 const struct device *parent;
7930 const char *empty = "";
7932 parent = dev->dev.parent;
7936 driver = parent->driver;
7937 if (driver && driver->name)
7938 return driver->name;
7942 static void __netdev_printk(const char *level, const struct net_device *dev,
7943 struct va_format *vaf)
7945 if (dev && dev->dev.parent) {
7946 dev_printk_emit(level[1] - '0',
7949 dev_driver_string(dev->dev.parent),
7950 dev_name(dev->dev.parent),
7951 netdev_name(dev), netdev_reg_state(dev),
7954 printk("%s%s%s: %pV",
7955 level, netdev_name(dev), netdev_reg_state(dev), vaf);
7957 printk("%s(NULL net_device): %pV", level, vaf);
7961 void netdev_printk(const char *level, const struct net_device *dev,
7962 const char *format, ...)
7964 struct va_format vaf;
7967 va_start(args, format);
7972 __netdev_printk(level, dev, &vaf);
7976 EXPORT_SYMBOL(netdev_printk);
7978 #define define_netdev_printk_level(func, level) \
7979 void func(const struct net_device *dev, const char *fmt, ...) \
7981 struct va_format vaf; \
7984 va_start(args, fmt); \
7989 __netdev_printk(level, dev, &vaf); \
7993 EXPORT_SYMBOL(func);
7995 define_netdev_printk_level(netdev_emerg, KERN_EMERG);
7996 define_netdev_printk_level(netdev_alert, KERN_ALERT);
7997 define_netdev_printk_level(netdev_crit, KERN_CRIT);
7998 define_netdev_printk_level(netdev_err, KERN_ERR);
7999 define_netdev_printk_level(netdev_warn, KERN_WARNING);
8000 define_netdev_printk_level(netdev_notice, KERN_NOTICE);
8001 define_netdev_printk_level(netdev_info, KERN_INFO);
8003 static void __net_exit netdev_exit(struct net *net)
8005 kfree(net->dev_name_head);
8006 kfree(net->dev_index_head);
8009 static struct pernet_operations __net_initdata netdev_net_ops = {
8010 .init = netdev_init,
8011 .exit = netdev_exit,
8014 static void __net_exit default_device_exit(struct net *net)
8016 struct net_device *dev, *aux;
8018 * Push all migratable network devices back to the
8019 * initial network namespace
8022 for_each_netdev_safe(net, dev, aux) {
8024 char fb_name[IFNAMSIZ];
8026 /* Ignore unmoveable devices (i.e. loopback) */
8027 if (dev->features & NETIF_F_NETNS_LOCAL)
8030 /* Leave virtual devices for the generic cleanup */
8031 if (dev->rtnl_link_ops)
8034 /* Push remaining network devices to init_net */
8035 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
8036 err = dev_change_net_namespace(dev, &init_net, fb_name);
8038 pr_emerg("%s: failed to move %s to init_net: %d\n",
8039 __func__, dev->name, err);
8046 static void __net_exit rtnl_lock_unregistering(struct list_head *net_list)
8048 /* Return with the rtnl_lock held when there are no network
8049 * devices unregistering in any network namespace in net_list.
8053 DEFINE_WAIT_FUNC(wait, woken_wake_function);
8055 add_wait_queue(&netdev_unregistering_wq, &wait);
8057 unregistering = false;
8059 list_for_each_entry(net, net_list, exit_list) {
8060 if (net->dev_unreg_count > 0) {
8061 unregistering = true;
8069 wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
8071 remove_wait_queue(&netdev_unregistering_wq, &wait);
8074 static void __net_exit default_device_exit_batch(struct list_head *net_list)
8076 /* At exit all network devices most be removed from a network
8077 * namespace. Do this in the reverse order of registration.
8078 * Do this across as many network namespaces as possible to
8079 * improve batching efficiency.
8081 struct net_device *dev;
8083 LIST_HEAD(dev_kill_list);
8085 /* To prevent network device cleanup code from dereferencing
8086 * loopback devices or network devices that have been freed
8087 * wait here for all pending unregistrations to complete,
8088 * before unregistring the loopback device and allowing the
8089 * network namespace be freed.
8091 * The netdev todo list containing all network devices
8092 * unregistrations that happen in default_device_exit_batch
8093 * will run in the rtnl_unlock() at the end of
8094 * default_device_exit_batch.
8096 rtnl_lock_unregistering(net_list);
8097 list_for_each_entry(net, net_list, exit_list) {
8098 for_each_netdev_reverse(net, dev) {
8099 if (dev->rtnl_link_ops && dev->rtnl_link_ops->dellink)
8100 dev->rtnl_link_ops->dellink(dev, &dev_kill_list);
8102 unregister_netdevice_queue(dev, &dev_kill_list);
8105 unregister_netdevice_many(&dev_kill_list);
8109 static struct pernet_operations __net_initdata default_device_ops = {
8110 .exit = default_device_exit,
8111 .exit_batch = default_device_exit_batch,
8115 * Initialize the DEV module. At boot time this walks the device list and
8116 * unhooks any devices that fail to initialise (normally hardware not
8117 * present) and leaves us with a valid list of present and active devices.
8122 * This is called single threaded during boot, so no need
8123 * to take the rtnl semaphore.
8125 static int __init net_dev_init(void)
8127 int i, rc = -ENOMEM;
8129 BUG_ON(!dev_boot_phase);
8131 if (dev_proc_init())
8134 if (netdev_kobject_init())
8137 INIT_LIST_HEAD(&ptype_all);
8138 for (i = 0; i < PTYPE_HASH_SIZE; i++)
8139 INIT_LIST_HEAD(&ptype_base[i]);
8141 INIT_LIST_HEAD(&offload_base);
8143 if (register_pernet_subsys(&netdev_net_ops))
8147 * Initialise the packet receive queues.
8150 for_each_possible_cpu(i) {
8151 struct softnet_data *sd = &per_cpu(softnet_data, i);
8153 skb_queue_head_init(&sd->input_pkt_queue);
8154 skb_queue_head_init(&sd->process_queue);
8155 INIT_LIST_HEAD(&sd->poll_list);
8156 sd->output_queue_tailp = &sd->output_queue;
8158 sd->csd.func = rps_trigger_softirq;
8163 sd->backlog.poll = process_backlog;
8164 sd->backlog.weight = weight_p;
8169 /* The loopback device is special if any other network devices
8170 * is present in a network namespace the loopback device must
8171 * be present. Since we now dynamically allocate and free the
8172 * loopback device ensure this invariant is maintained by
8173 * keeping the loopback device as the first device on the
8174 * list of network devices. Ensuring the loopback devices
8175 * is the first device that appears and the last network device
8178 if (register_pernet_device(&loopback_net_ops))
8181 if (register_pernet_device(&default_device_ops))
8184 open_softirq(NET_TX_SOFTIRQ, net_tx_action);
8185 open_softirq(NET_RX_SOFTIRQ, net_rx_action);
8187 hotcpu_notifier(dev_cpu_callback, 0);
8194 subsys_initcall(net_dev_init);