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 <asm/system.h>
77 #include <linux/bitops.h>
78 #include <linux/capability.h>
79 #include <linux/cpu.h>
80 #include <linux/types.h>
81 #include <linux/kernel.h>
82 #include <linux/hash.h>
83 #include <linux/slab.h>
84 #include <linux/sched.h>
85 #include <linux/mutex.h>
86 #include <linux/string.h>
88 #include <linux/socket.h>
89 #include <linux/sockios.h>
90 #include <linux/errno.h>
91 #include <linux/interrupt.h>
92 #include <linux/if_ether.h>
93 #include <linux/netdevice.h>
94 #include <linux/etherdevice.h>
95 #include <linux/ethtool.h>
96 #include <linux/notifier.h>
97 #include <linux/skbuff.h>
98 #include <net/net_namespace.h>
100 #include <linux/rtnetlink.h>
101 #include <linux/proc_fs.h>
102 #include <linux/seq_file.h>
103 #include <linux/stat.h>
105 #include <net/pkt_sched.h>
106 #include <net/checksum.h>
107 #include <net/xfrm.h>
108 #include <linux/highmem.h>
109 #include <linux/init.h>
110 #include <linux/kmod.h>
111 #include <linux/module.h>
112 #include <linux/netpoll.h>
113 #include <linux/rcupdate.h>
114 #include <linux/delay.h>
115 #include <net/wext.h>
116 #include <net/iw_handler.h>
117 #include <asm/current.h>
118 #include <linux/audit.h>
119 #include <linux/dmaengine.h>
120 #include <linux/err.h>
121 #include <linux/ctype.h>
122 #include <linux/if_arp.h>
123 #include <linux/if_vlan.h>
124 #include <linux/ip.h>
126 #include <linux/ipv6.h>
127 #include <linux/in.h>
128 #include <linux/jhash.h>
129 #include <linux/random.h>
130 #include <trace/events/napi.h>
131 #include <trace/events/net.h>
132 #include <trace/events/skb.h>
133 #include <linux/pci.h>
134 #include <linux/inetdevice.h>
135 #include <linux/cpu_rmap.h>
136 #include <linux/net_tstamp.h>
137 #include <linux/jump_label.h>
138 #include <net/flow_keys.h>
140 #include "net-sysfs.h"
142 /* Instead of increasing this, you should create a hash table. */
143 #define MAX_GRO_SKBS 8
145 /* This should be increased if a protocol with a bigger head is added. */
146 #define GRO_MAX_HEAD (MAX_HEADER + 128)
149 * The list of packet types we will receive (as opposed to discard)
150 * and the routines to invoke.
152 * Why 16. Because with 16 the only overlap we get on a hash of the
153 * low nibble of the protocol value is RARP/SNAP/X.25.
155 * NOTE: That is no longer true with the addition of VLAN tags. Not
156 * sure which should go first, but I bet it won't make much
157 * difference if we are running VLANs. The good news is that
158 * this protocol won't be in the list unless compiled in, so
159 * the average user (w/out VLANs) will not be adversely affected.
176 #define PTYPE_HASH_SIZE (16)
177 #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1)
179 static DEFINE_SPINLOCK(ptype_lock);
180 static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
181 static struct list_head ptype_all __read_mostly; /* Taps */
184 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
187 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
189 * Writers must hold the rtnl semaphore while they loop through the
190 * dev_base_head list, and hold dev_base_lock for writing when they do the
191 * actual updates. This allows pure readers to access the list even
192 * while a writer is preparing to update it.
194 * To put it another way, dev_base_lock is held for writing only to
195 * protect against pure readers; the rtnl semaphore provides the
196 * protection against other writers.
198 * See, for example usages, register_netdevice() and
199 * unregister_netdevice(), which must be called with the rtnl
202 DEFINE_RWLOCK(dev_base_lock);
203 EXPORT_SYMBOL(dev_base_lock);
205 static inline void dev_base_seq_inc(struct net *net)
207 while (++net->dev_base_seq == 0);
210 static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
212 unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
213 return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)];
216 static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
218 return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)];
221 static inline void rps_lock(struct softnet_data *sd)
224 spin_lock(&sd->input_pkt_queue.lock);
228 static inline void rps_unlock(struct softnet_data *sd)
231 spin_unlock(&sd->input_pkt_queue.lock);
235 /* Device list insertion */
236 static int list_netdevice(struct net_device *dev)
238 struct net *net = dev_net(dev);
242 write_lock_bh(&dev_base_lock);
243 list_add_tail_rcu(&dev->dev_list, &net->dev_base_head);
244 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
245 hlist_add_head_rcu(&dev->index_hlist,
246 dev_index_hash(net, dev->ifindex));
247 write_unlock_bh(&dev_base_lock);
249 dev_base_seq_inc(net);
254 /* Device list removal
255 * caller must respect a RCU grace period before freeing/reusing dev
257 static void unlist_netdevice(struct net_device *dev)
261 /* Unlink dev from the device chain */
262 write_lock_bh(&dev_base_lock);
263 list_del_rcu(&dev->dev_list);
264 hlist_del_rcu(&dev->name_hlist);
265 hlist_del_rcu(&dev->index_hlist);
266 write_unlock_bh(&dev_base_lock);
268 dev_base_seq_inc(dev_net(dev));
275 static RAW_NOTIFIER_HEAD(netdev_chain);
278 * Device drivers call our routines to queue packets here. We empty the
279 * queue in the local softnet handler.
282 DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
283 EXPORT_PER_CPU_SYMBOL(softnet_data);
285 #ifdef CONFIG_LOCKDEP
287 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
288 * according to dev->type
290 static const unsigned short netdev_lock_type[] =
291 {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
292 ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
293 ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
294 ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
295 ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
296 ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
297 ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
298 ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
299 ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
300 ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
301 ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
302 ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
303 ARPHRD_FCFABRIC, ARPHRD_IEEE802_TR, ARPHRD_IEEE80211,
304 ARPHRD_IEEE80211_PRISM, ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET,
305 ARPHRD_PHONET_PIPE, ARPHRD_IEEE802154,
306 ARPHRD_VOID, ARPHRD_NONE};
308 static const char *const netdev_lock_name[] =
309 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
310 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
311 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
312 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
313 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
314 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
315 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
316 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
317 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
318 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
319 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
320 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
321 "_xmit_FCFABRIC", "_xmit_IEEE802_TR", "_xmit_IEEE80211",
322 "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET",
323 "_xmit_PHONET_PIPE", "_xmit_IEEE802154",
324 "_xmit_VOID", "_xmit_NONE"};
326 static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
327 static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)];
329 static inline unsigned short netdev_lock_pos(unsigned short dev_type)
333 for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++)
334 if (netdev_lock_type[i] == dev_type)
336 /* the last key is used by default */
337 return ARRAY_SIZE(netdev_lock_type) - 1;
340 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
341 unsigned short dev_type)
345 i = netdev_lock_pos(dev_type);
346 lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
347 netdev_lock_name[i]);
350 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
354 i = netdev_lock_pos(dev->type);
355 lockdep_set_class_and_name(&dev->addr_list_lock,
356 &netdev_addr_lock_key[i],
357 netdev_lock_name[i]);
360 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
361 unsigned short dev_type)
364 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
369 /*******************************************************************************
371 Protocol management and registration routines
373 *******************************************************************************/
376 * Add a protocol ID to the list. Now that the input handler is
377 * smarter we can dispense with all the messy stuff that used to be
380 * BEWARE!!! Protocol handlers, mangling input packets,
381 * MUST BE last in hash buckets and checking protocol handlers
382 * MUST start from promiscuous ptype_all chain in net_bh.
383 * It is true now, do not change it.
384 * Explanation follows: if protocol handler, mangling packet, will
385 * be the first on list, it is not able to sense, that packet
386 * is cloned and should be copied-on-write, so that it will
387 * change it and subsequent readers will get broken packet.
391 static inline struct list_head *ptype_head(const struct packet_type *pt)
393 if (pt->type == htons(ETH_P_ALL))
396 return &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
400 * dev_add_pack - add packet handler
401 * @pt: packet type declaration
403 * Add a protocol handler to the networking stack. The passed &packet_type
404 * is linked into kernel lists and may not be freed until it has been
405 * removed from the kernel lists.
407 * This call does not sleep therefore it can not
408 * guarantee all CPU's that are in middle of receiving packets
409 * will see the new packet type (until the next received packet).
412 void dev_add_pack(struct packet_type *pt)
414 struct list_head *head = ptype_head(pt);
416 spin_lock(&ptype_lock);
417 list_add_rcu(&pt->list, head);
418 spin_unlock(&ptype_lock);
420 EXPORT_SYMBOL(dev_add_pack);
423 * __dev_remove_pack - remove packet handler
424 * @pt: packet type declaration
426 * Remove a protocol handler that was previously added to the kernel
427 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
428 * from the kernel lists and can be freed or reused once this function
431 * The packet type might still be in use by receivers
432 * and must not be freed until after all the CPU's have gone
433 * through a quiescent state.
435 void __dev_remove_pack(struct packet_type *pt)
437 struct list_head *head = ptype_head(pt);
438 struct packet_type *pt1;
440 spin_lock(&ptype_lock);
442 list_for_each_entry(pt1, head, list) {
444 list_del_rcu(&pt->list);
449 printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt);
451 spin_unlock(&ptype_lock);
453 EXPORT_SYMBOL(__dev_remove_pack);
456 * dev_remove_pack - remove packet handler
457 * @pt: packet type declaration
459 * Remove a protocol handler that was previously added to the kernel
460 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
461 * from the kernel lists and can be freed or reused once this function
464 * This call sleeps to guarantee that no CPU is looking at the packet
467 void dev_remove_pack(struct packet_type *pt)
469 __dev_remove_pack(pt);
473 EXPORT_SYMBOL(dev_remove_pack);
475 /******************************************************************************
477 Device Boot-time Settings Routines
479 *******************************************************************************/
481 /* Boot time configuration table */
482 static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
485 * netdev_boot_setup_add - add new setup entry
486 * @name: name of the device
487 * @map: configured settings for the device
489 * Adds new setup entry to the dev_boot_setup list. The function
490 * returns 0 on error and 1 on success. This is a generic routine to
493 static int netdev_boot_setup_add(char *name, struct ifmap *map)
495 struct netdev_boot_setup *s;
499 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
500 if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
501 memset(s[i].name, 0, sizeof(s[i].name));
502 strlcpy(s[i].name, name, IFNAMSIZ);
503 memcpy(&s[i].map, map, sizeof(s[i].map));
508 return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
512 * netdev_boot_setup_check - check boot time settings
513 * @dev: the netdevice
515 * Check boot time settings for the device.
516 * The found settings are set for the device to be used
517 * later in the device probing.
518 * Returns 0 if no settings found, 1 if they are.
520 int netdev_boot_setup_check(struct net_device *dev)
522 struct netdev_boot_setup *s = dev_boot_setup;
525 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
526 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
527 !strcmp(dev->name, s[i].name)) {
528 dev->irq = s[i].map.irq;
529 dev->base_addr = s[i].map.base_addr;
530 dev->mem_start = s[i].map.mem_start;
531 dev->mem_end = s[i].map.mem_end;
537 EXPORT_SYMBOL(netdev_boot_setup_check);
541 * netdev_boot_base - get address from boot time settings
542 * @prefix: prefix for network device
543 * @unit: id for network device
545 * Check boot time settings for the base address of device.
546 * The found settings are set for the device to be used
547 * later in the device probing.
548 * Returns 0 if no settings found.
550 unsigned long netdev_boot_base(const char *prefix, int unit)
552 const struct netdev_boot_setup *s = dev_boot_setup;
556 sprintf(name, "%s%d", prefix, unit);
559 * If device already registered then return base of 1
560 * to indicate not to probe for this interface
562 if (__dev_get_by_name(&init_net, name))
565 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
566 if (!strcmp(name, s[i].name))
567 return s[i].map.base_addr;
572 * Saves at boot time configured settings for any netdevice.
574 int __init netdev_boot_setup(char *str)
579 str = get_options(str, ARRAY_SIZE(ints), ints);
584 memset(&map, 0, sizeof(map));
588 map.base_addr = ints[2];
590 map.mem_start = ints[3];
592 map.mem_end = ints[4];
594 /* Add new entry to the list */
595 return netdev_boot_setup_add(str, &map);
598 __setup("netdev=", netdev_boot_setup);
600 /*******************************************************************************
602 Device Interface Subroutines
604 *******************************************************************************/
607 * __dev_get_by_name - find a device by its name
608 * @net: the applicable net namespace
609 * @name: name to find
611 * Find an interface by name. Must be called under RTNL semaphore
612 * or @dev_base_lock. If the name is found a pointer to the device
613 * is returned. If the name is not found then %NULL is returned. The
614 * reference counters are not incremented so the caller must be
615 * careful with locks.
618 struct net_device *__dev_get_by_name(struct net *net, const char *name)
620 struct hlist_node *p;
621 struct net_device *dev;
622 struct hlist_head *head = dev_name_hash(net, name);
624 hlist_for_each_entry(dev, p, head, name_hlist)
625 if (!strncmp(dev->name, name, IFNAMSIZ))
630 EXPORT_SYMBOL(__dev_get_by_name);
633 * dev_get_by_name_rcu - find a device by its name
634 * @net: the applicable net namespace
635 * @name: name to find
637 * Find an interface by name.
638 * If the name is found a pointer to the device is returned.
639 * If the name is not found then %NULL is returned.
640 * The reference counters are not incremented so the caller must be
641 * careful with locks. The caller must hold RCU lock.
644 struct net_device *dev_get_by_name_rcu(struct net *net, const char *name)
646 struct hlist_node *p;
647 struct net_device *dev;
648 struct hlist_head *head = dev_name_hash(net, name);
650 hlist_for_each_entry_rcu(dev, p, head, name_hlist)
651 if (!strncmp(dev->name, name, IFNAMSIZ))
656 EXPORT_SYMBOL(dev_get_by_name_rcu);
659 * dev_get_by_name - find a device by its name
660 * @net: the applicable net namespace
661 * @name: name to find
663 * Find an interface by name. This can be called from any
664 * context and does its own locking. The returned handle has
665 * the usage count incremented and the caller must use dev_put() to
666 * release it when it is no longer needed. %NULL is returned if no
667 * matching device is found.
670 struct net_device *dev_get_by_name(struct net *net, const char *name)
672 struct net_device *dev;
675 dev = dev_get_by_name_rcu(net, name);
681 EXPORT_SYMBOL(dev_get_by_name);
684 * __dev_get_by_index - find a device by its ifindex
685 * @net: the applicable net namespace
686 * @ifindex: index of device
688 * Search for an interface by index. Returns %NULL if the device
689 * is not found or a pointer to the device. The device has not
690 * had its reference counter increased so the caller must be careful
691 * about locking. The caller must hold either the RTNL semaphore
695 struct net_device *__dev_get_by_index(struct net *net, int ifindex)
697 struct hlist_node *p;
698 struct net_device *dev;
699 struct hlist_head *head = dev_index_hash(net, ifindex);
701 hlist_for_each_entry(dev, p, head, index_hlist)
702 if (dev->ifindex == ifindex)
707 EXPORT_SYMBOL(__dev_get_by_index);
710 * dev_get_by_index_rcu - find a device by its ifindex
711 * @net: the applicable net namespace
712 * @ifindex: index of device
714 * Search for an interface by index. Returns %NULL if the device
715 * is not found or a pointer to the device. The device has not
716 * had its reference counter increased so the caller must be careful
717 * about locking. The caller must hold RCU lock.
720 struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex)
722 struct hlist_node *p;
723 struct net_device *dev;
724 struct hlist_head *head = dev_index_hash(net, ifindex);
726 hlist_for_each_entry_rcu(dev, p, head, index_hlist)
727 if (dev->ifindex == ifindex)
732 EXPORT_SYMBOL(dev_get_by_index_rcu);
736 * dev_get_by_index - find a device by its ifindex
737 * @net: the applicable net namespace
738 * @ifindex: index of device
740 * Search for an interface by index. Returns NULL if the device
741 * is not found or a pointer to the device. The device returned has
742 * had a reference added and the pointer is safe until the user calls
743 * dev_put to indicate they have finished with it.
746 struct net_device *dev_get_by_index(struct net *net, int ifindex)
748 struct net_device *dev;
751 dev = dev_get_by_index_rcu(net, ifindex);
757 EXPORT_SYMBOL(dev_get_by_index);
760 * dev_getbyhwaddr_rcu - find a device by its hardware address
761 * @net: the applicable net namespace
762 * @type: media type of device
763 * @ha: hardware address
765 * Search for an interface by MAC address. Returns NULL if the device
766 * is not found or a pointer to the device.
767 * The caller must hold RCU or RTNL.
768 * The returned device has not had its ref count increased
769 * and the caller must therefore be careful about locking
773 struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
776 struct net_device *dev;
778 for_each_netdev_rcu(net, dev)
779 if (dev->type == type &&
780 !memcmp(dev->dev_addr, ha, dev->addr_len))
785 EXPORT_SYMBOL(dev_getbyhwaddr_rcu);
787 struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
789 struct net_device *dev;
792 for_each_netdev(net, dev)
793 if (dev->type == type)
798 EXPORT_SYMBOL(__dev_getfirstbyhwtype);
800 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
802 struct net_device *dev, *ret = NULL;
805 for_each_netdev_rcu(net, dev)
806 if (dev->type == type) {
814 EXPORT_SYMBOL(dev_getfirstbyhwtype);
817 * dev_get_by_flags_rcu - find any device with given flags
818 * @net: the applicable net namespace
819 * @if_flags: IFF_* values
820 * @mask: bitmask of bits in if_flags to check
822 * Search for any interface with the given flags. Returns NULL if a device
823 * is not found or a pointer to the device. Must be called inside
824 * rcu_read_lock(), and result refcount is unchanged.
827 struct net_device *dev_get_by_flags_rcu(struct net *net, unsigned short if_flags,
830 struct net_device *dev, *ret;
833 for_each_netdev_rcu(net, dev) {
834 if (((dev->flags ^ if_flags) & mask) == 0) {
841 EXPORT_SYMBOL(dev_get_by_flags_rcu);
844 * dev_valid_name - check if name is okay for network device
847 * Network device names need to be valid file names to
848 * to allow sysfs to work. We also disallow any kind of
851 int dev_valid_name(const char *name)
855 if (strlen(name) >= IFNAMSIZ)
857 if (!strcmp(name, ".") || !strcmp(name, ".."))
861 if (*name == '/' || isspace(*name))
867 EXPORT_SYMBOL(dev_valid_name);
870 * __dev_alloc_name - allocate a name for a device
871 * @net: network namespace to allocate the device name in
872 * @name: name format string
873 * @buf: scratch buffer and result name string
875 * Passed a format string - eg "lt%d" it will try and find a suitable
876 * id. It scans list of devices to build up a free map, then chooses
877 * the first empty slot. The caller must hold the dev_base or rtnl lock
878 * while allocating the name and adding the device in order to avoid
880 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
881 * Returns the number of the unit assigned or a negative errno code.
884 static int __dev_alloc_name(struct net *net, const char *name, char *buf)
888 const int max_netdevices = 8*PAGE_SIZE;
889 unsigned long *inuse;
890 struct net_device *d;
892 p = strnchr(name, IFNAMSIZ-1, '%');
895 * Verify the string as this thing may have come from
896 * the user. There must be either one "%d" and no other "%"
899 if (p[1] != 'd' || strchr(p + 2, '%'))
902 /* Use one page as a bit array of possible slots */
903 inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
907 for_each_netdev(net, d) {
908 if (!sscanf(d->name, name, &i))
910 if (i < 0 || i >= max_netdevices)
913 /* avoid cases where sscanf is not exact inverse of printf */
914 snprintf(buf, IFNAMSIZ, name, i);
915 if (!strncmp(buf, d->name, IFNAMSIZ))
919 i = find_first_zero_bit(inuse, max_netdevices);
920 free_page((unsigned long) inuse);
924 snprintf(buf, IFNAMSIZ, name, i);
925 if (!__dev_get_by_name(net, buf))
928 /* It is possible to run out of possible slots
929 * when the name is long and there isn't enough space left
930 * for the digits, or if all bits are used.
936 * dev_alloc_name - allocate a name for a device
938 * @name: name format string
940 * Passed a format string - eg "lt%d" it will try and find a suitable
941 * id. It scans list of devices to build up a free map, then chooses
942 * the first empty slot. The caller must hold the dev_base or rtnl lock
943 * while allocating the name and adding the device in order to avoid
945 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
946 * Returns the number of the unit assigned or a negative errno code.
949 int dev_alloc_name(struct net_device *dev, const char *name)
955 BUG_ON(!dev_net(dev));
957 ret = __dev_alloc_name(net, name, buf);
959 strlcpy(dev->name, buf, IFNAMSIZ);
962 EXPORT_SYMBOL(dev_alloc_name);
964 static int dev_get_valid_name(struct net_device *dev, const char *name)
968 BUG_ON(!dev_net(dev));
971 if (!dev_valid_name(name))
974 if (strchr(name, '%'))
975 return dev_alloc_name(dev, name);
976 else if (__dev_get_by_name(net, name))
978 else if (dev->name != name)
979 strlcpy(dev->name, name, IFNAMSIZ);
985 * dev_change_name - change name of a device
987 * @newname: name (or format string) must be at least IFNAMSIZ
989 * Change name of a device, can pass format strings "eth%d".
992 int dev_change_name(struct net_device *dev, const char *newname)
994 char oldname[IFNAMSIZ];
1000 BUG_ON(!dev_net(dev));
1003 if (dev->flags & IFF_UP)
1006 if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
1009 memcpy(oldname, dev->name, IFNAMSIZ);
1011 err = dev_get_valid_name(dev, newname);
1016 ret = device_rename(&dev->dev, dev->name);
1018 memcpy(dev->name, oldname, IFNAMSIZ);
1022 write_lock_bh(&dev_base_lock);
1023 hlist_del_rcu(&dev->name_hlist);
1024 write_unlock_bh(&dev_base_lock);
1028 write_lock_bh(&dev_base_lock);
1029 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
1030 write_unlock_bh(&dev_base_lock);
1032 ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
1033 ret = notifier_to_errno(ret);
1036 /* err >= 0 after dev_alloc_name() or stores the first errno */
1039 memcpy(dev->name, oldname, IFNAMSIZ);
1043 "%s: name change rollback failed: %d.\n",
1052 * dev_set_alias - change ifalias of a device
1054 * @alias: name up to IFALIASZ
1055 * @len: limit of bytes to copy from info
1057 * Set ifalias for a device,
1059 int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
1063 if (len >= IFALIASZ)
1068 kfree(dev->ifalias);
1069 dev->ifalias = NULL;
1074 dev->ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL);
1078 strlcpy(dev->ifalias, alias, len+1);
1084 * netdev_features_change - device changes features
1085 * @dev: device to cause notification
1087 * Called to indicate a device has changed features.
1089 void netdev_features_change(struct net_device *dev)
1091 call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
1093 EXPORT_SYMBOL(netdev_features_change);
1096 * netdev_state_change - device changes state
1097 * @dev: device to cause notification
1099 * Called to indicate a device has changed state. This function calls
1100 * the notifier chains for netdev_chain and sends a NEWLINK message
1101 * to the routing socket.
1103 void netdev_state_change(struct net_device *dev)
1105 if (dev->flags & IFF_UP) {
1106 call_netdevice_notifiers(NETDEV_CHANGE, dev);
1107 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1110 EXPORT_SYMBOL(netdev_state_change);
1112 int netdev_bonding_change(struct net_device *dev, unsigned long event)
1114 return call_netdevice_notifiers(event, dev);
1116 EXPORT_SYMBOL(netdev_bonding_change);
1119 * dev_load - load a network module
1120 * @net: the applicable net namespace
1121 * @name: name of interface
1123 * If a network interface is not present and the process has suitable
1124 * privileges this function loads the module. If module loading is not
1125 * available in this kernel then it becomes a nop.
1128 void dev_load(struct net *net, const char *name)
1130 struct net_device *dev;
1134 dev = dev_get_by_name_rcu(net, name);
1138 if (no_module && capable(CAP_NET_ADMIN))
1139 no_module = request_module("netdev-%s", name);
1140 if (no_module && capable(CAP_SYS_MODULE)) {
1141 if (!request_module("%s", name))
1142 pr_err("Loading kernel module for a network device "
1143 "with CAP_SYS_MODULE (deprecated). Use CAP_NET_ADMIN and alias netdev-%s "
1147 EXPORT_SYMBOL(dev_load);
1149 static int __dev_open(struct net_device *dev)
1151 const struct net_device_ops *ops = dev->netdev_ops;
1156 if (!netif_device_present(dev))
1159 ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev);
1160 ret = notifier_to_errno(ret);
1164 set_bit(__LINK_STATE_START, &dev->state);
1166 if (ops->ndo_validate_addr)
1167 ret = ops->ndo_validate_addr(dev);
1169 if (!ret && ops->ndo_open)
1170 ret = ops->ndo_open(dev);
1173 clear_bit(__LINK_STATE_START, &dev->state);
1175 dev->flags |= IFF_UP;
1176 net_dmaengine_get();
1177 dev_set_rx_mode(dev);
1185 * dev_open - prepare an interface for use.
1186 * @dev: device to open
1188 * Takes a device from down to up state. The device's private open
1189 * function is invoked and then the multicast lists are loaded. Finally
1190 * the device is moved into the up state and a %NETDEV_UP message is
1191 * sent to the netdev notifier chain.
1193 * Calling this function on an active interface is a nop. On a failure
1194 * a negative errno code is returned.
1196 int dev_open(struct net_device *dev)
1200 if (dev->flags & IFF_UP)
1203 ret = __dev_open(dev);
1207 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1208 call_netdevice_notifiers(NETDEV_UP, dev);
1212 EXPORT_SYMBOL(dev_open);
1214 static int __dev_close_many(struct list_head *head)
1216 struct net_device *dev;
1221 list_for_each_entry(dev, head, unreg_list) {
1222 call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
1224 clear_bit(__LINK_STATE_START, &dev->state);
1226 /* Synchronize to scheduled poll. We cannot touch poll list, it
1227 * can be even on different cpu. So just clear netif_running().
1229 * dev->stop() will invoke napi_disable() on all of it's
1230 * napi_struct instances on this device.
1232 smp_mb__after_clear_bit(); /* Commit netif_running(). */
1235 dev_deactivate_many(head);
1237 list_for_each_entry(dev, head, unreg_list) {
1238 const struct net_device_ops *ops = dev->netdev_ops;
1241 * Call the device specific close. This cannot fail.
1242 * Only if device is UP
1244 * We allow it to be called even after a DETACH hot-plug
1250 dev->flags &= ~IFF_UP;
1251 net_dmaengine_put();
1257 static int __dev_close(struct net_device *dev)
1262 list_add(&dev->unreg_list, &single);
1263 retval = __dev_close_many(&single);
1268 static int dev_close_many(struct list_head *head)
1270 struct net_device *dev, *tmp;
1271 LIST_HEAD(tmp_list);
1273 list_for_each_entry_safe(dev, tmp, head, unreg_list)
1274 if (!(dev->flags & IFF_UP))
1275 list_move(&dev->unreg_list, &tmp_list);
1277 __dev_close_many(head);
1279 list_for_each_entry(dev, head, unreg_list) {
1280 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1281 call_netdevice_notifiers(NETDEV_DOWN, dev);
1284 /* rollback_registered_many needs the complete original list */
1285 list_splice(&tmp_list, head);
1290 * dev_close - shutdown an interface.
1291 * @dev: device to shutdown
1293 * This function moves an active device into down state. A
1294 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1295 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1298 int dev_close(struct net_device *dev)
1300 if (dev->flags & IFF_UP) {
1303 list_add(&dev->unreg_list, &single);
1304 dev_close_many(&single);
1309 EXPORT_SYMBOL(dev_close);
1313 * dev_disable_lro - disable Large Receive Offload on a device
1316 * Disable Large Receive Offload (LRO) on a net device. Must be
1317 * called under RTNL. This is needed if received packets may be
1318 * forwarded to another interface.
1320 void dev_disable_lro(struct net_device *dev)
1323 * If we're trying to disable lro on a vlan device
1324 * use the underlying physical device instead
1326 if (is_vlan_dev(dev))
1327 dev = vlan_dev_real_dev(dev);
1329 dev->wanted_features &= ~NETIF_F_LRO;
1330 netdev_update_features(dev);
1332 if (unlikely(dev->features & NETIF_F_LRO))
1333 netdev_WARN(dev, "failed to disable LRO!\n");
1335 EXPORT_SYMBOL(dev_disable_lro);
1338 static int dev_boot_phase = 1;
1341 * register_netdevice_notifier - register a network notifier block
1344 * Register a notifier to be called when network device events occur.
1345 * The notifier passed is linked into the kernel structures and must
1346 * not be reused until it has been unregistered. A negative errno code
1347 * is returned on a failure.
1349 * When registered all registration and up events are replayed
1350 * to the new notifier to allow device to have a race free
1351 * view of the network device list.
1354 int register_netdevice_notifier(struct notifier_block *nb)
1356 struct net_device *dev;
1357 struct net_device *last;
1362 err = raw_notifier_chain_register(&netdev_chain, nb);
1368 for_each_netdev(net, dev) {
1369 err = nb->notifier_call(nb, NETDEV_REGISTER, dev);
1370 err = notifier_to_errno(err);
1374 if (!(dev->flags & IFF_UP))
1377 nb->notifier_call(nb, NETDEV_UP, dev);
1388 for_each_netdev(net, dev) {
1392 if (dev->flags & IFF_UP) {
1393 nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
1394 nb->notifier_call(nb, NETDEV_DOWN, dev);
1396 nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
1397 nb->notifier_call(nb, NETDEV_UNREGISTER_BATCH, dev);
1402 raw_notifier_chain_unregister(&netdev_chain, nb);
1405 EXPORT_SYMBOL(register_netdevice_notifier);
1408 * unregister_netdevice_notifier - unregister a network notifier block
1411 * Unregister a notifier previously registered by
1412 * register_netdevice_notifier(). The notifier is unlinked into the
1413 * kernel structures and may then be reused. A negative errno code
1414 * is returned on a failure.
1417 int unregister_netdevice_notifier(struct notifier_block *nb)
1422 err = raw_notifier_chain_unregister(&netdev_chain, nb);
1426 EXPORT_SYMBOL(unregister_netdevice_notifier);
1429 * call_netdevice_notifiers - call all network notifier blocks
1430 * @val: value passed unmodified to notifier function
1431 * @dev: net_device pointer passed unmodified to notifier function
1433 * Call all network notifier blocks. Parameters and return value
1434 * are as for raw_notifier_call_chain().
1437 int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
1440 return raw_notifier_call_chain(&netdev_chain, val, dev);
1442 EXPORT_SYMBOL(call_netdevice_notifiers);
1444 static struct jump_label_key netstamp_needed __read_mostly;
1445 #ifdef HAVE_JUMP_LABEL
1446 /* We are not allowed to call jump_label_dec() from irq context
1447 * If net_disable_timestamp() is called from irq context, defer the
1448 * jump_label_dec() calls.
1450 static atomic_t netstamp_needed_deferred;
1453 void net_enable_timestamp(void)
1455 #ifdef HAVE_JUMP_LABEL
1456 int deferred = atomic_xchg(&netstamp_needed_deferred, 0);
1460 jump_label_dec(&netstamp_needed);
1464 WARN_ON(in_interrupt());
1465 jump_label_inc(&netstamp_needed);
1467 EXPORT_SYMBOL(net_enable_timestamp);
1469 void net_disable_timestamp(void)
1471 #ifdef HAVE_JUMP_LABEL
1472 if (in_interrupt()) {
1473 atomic_inc(&netstamp_needed_deferred);
1477 jump_label_dec(&netstamp_needed);
1479 EXPORT_SYMBOL(net_disable_timestamp);
1481 static inline void net_timestamp_set(struct sk_buff *skb)
1483 skb->tstamp.tv64 = 0;
1484 if (static_branch(&netstamp_needed))
1485 __net_timestamp(skb);
1488 #define net_timestamp_check(COND, SKB) \
1489 if (static_branch(&netstamp_needed)) { \
1490 if ((COND) && !(SKB)->tstamp.tv64) \
1491 __net_timestamp(SKB); \
1494 static int net_hwtstamp_validate(struct ifreq *ifr)
1496 struct hwtstamp_config cfg;
1497 enum hwtstamp_tx_types tx_type;
1498 enum hwtstamp_rx_filters rx_filter;
1499 int tx_type_valid = 0;
1500 int rx_filter_valid = 0;
1502 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
1505 if (cfg.flags) /* reserved for future extensions */
1508 tx_type = cfg.tx_type;
1509 rx_filter = cfg.rx_filter;
1512 case HWTSTAMP_TX_OFF:
1513 case HWTSTAMP_TX_ON:
1514 case HWTSTAMP_TX_ONESTEP_SYNC:
1519 switch (rx_filter) {
1520 case HWTSTAMP_FILTER_NONE:
1521 case HWTSTAMP_FILTER_ALL:
1522 case HWTSTAMP_FILTER_SOME:
1523 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
1524 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
1525 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
1526 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
1527 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
1528 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
1529 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
1530 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
1531 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
1532 case HWTSTAMP_FILTER_PTP_V2_EVENT:
1533 case HWTSTAMP_FILTER_PTP_V2_SYNC:
1534 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
1535 rx_filter_valid = 1;
1539 if (!tx_type_valid || !rx_filter_valid)
1545 static inline bool is_skb_forwardable(struct net_device *dev,
1546 struct sk_buff *skb)
1550 if (!(dev->flags & IFF_UP))
1553 len = dev->mtu + dev->hard_header_len + VLAN_HLEN;
1554 if (skb->len <= len)
1557 /* if TSO is enabled, we don't care about the length as the packet
1558 * could be forwarded without being segmented before
1560 if (skb_is_gso(skb))
1567 * dev_forward_skb - loopback an skb to another netif
1569 * @dev: destination network device
1570 * @skb: buffer to forward
1573 * NET_RX_SUCCESS (no congestion)
1574 * NET_RX_DROP (packet was dropped, but freed)
1576 * dev_forward_skb can be used for injecting an skb from the
1577 * start_xmit function of one device into the receive queue
1578 * of another device.
1580 * The receiving device may be in another namespace, so
1581 * we have to clear all information in the skb that could
1582 * impact namespace isolation.
1584 int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
1586 if (skb_shinfo(skb)->tx_flags & SKBTX_DEV_ZEROCOPY) {
1587 if (skb_copy_ubufs(skb, GFP_ATOMIC)) {
1588 atomic_long_inc(&dev->rx_dropped);
1597 if (unlikely(!is_skb_forwardable(dev, skb))) {
1598 atomic_long_inc(&dev->rx_dropped);
1602 skb_set_dev(skb, dev);
1603 skb->tstamp.tv64 = 0;
1604 skb->pkt_type = PACKET_HOST;
1605 skb->protocol = eth_type_trans(skb, dev);
1606 return netif_rx(skb);
1608 EXPORT_SYMBOL_GPL(dev_forward_skb);
1610 static inline int deliver_skb(struct sk_buff *skb,
1611 struct packet_type *pt_prev,
1612 struct net_device *orig_dev)
1614 atomic_inc(&skb->users);
1615 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
1619 * Support routine. Sends outgoing frames to any network
1620 * taps currently in use.
1623 static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1625 struct packet_type *ptype;
1626 struct sk_buff *skb2 = NULL;
1627 struct packet_type *pt_prev = NULL;
1630 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1631 /* Never send packets back to the socket
1632 * they originated from - MvS (miquels@drinkel.ow.org)
1634 if ((ptype->dev == dev || !ptype->dev) &&
1635 (ptype->af_packet_priv == NULL ||
1636 (struct sock *)ptype->af_packet_priv != skb->sk)) {
1638 deliver_skb(skb2, pt_prev, skb->dev);
1643 skb2 = skb_clone(skb, GFP_ATOMIC);
1647 net_timestamp_set(skb2);
1649 /* skb->nh should be correctly
1650 set by sender, so that the second statement is
1651 just protection against buggy protocols.
1653 skb_reset_mac_header(skb2);
1655 if (skb_network_header(skb2) < skb2->data ||
1656 skb2->network_header > skb2->tail) {
1657 if (net_ratelimit())
1658 printk(KERN_CRIT "protocol %04x is "
1660 ntohs(skb2->protocol),
1662 skb_reset_network_header(skb2);
1665 skb2->transport_header = skb2->network_header;
1666 skb2->pkt_type = PACKET_OUTGOING;
1671 pt_prev->func(skb2, skb->dev, pt_prev, skb->dev);
1675 /* netif_setup_tc - Handle tc mappings on real_num_tx_queues change
1676 * @dev: Network device
1677 * @txq: number of queues available
1679 * If real_num_tx_queues is changed the tc mappings may no longer be
1680 * valid. To resolve this verify the tc mapping remains valid and if
1681 * not NULL the mapping. With no priorities mapping to this
1682 * offset/count pair it will no longer be used. In the worst case TC0
1683 * is invalid nothing can be done so disable priority mappings. If is
1684 * expected that drivers will fix this mapping if they can before
1685 * calling netif_set_real_num_tx_queues.
1687 static void netif_setup_tc(struct net_device *dev, unsigned int txq)
1690 struct netdev_tc_txq *tc = &dev->tc_to_txq[0];
1692 /* If TC0 is invalidated disable TC mapping */
1693 if (tc->offset + tc->count > txq) {
1694 pr_warning("Number of in use tx queues changed "
1695 "invalidating tc mappings. Priority "
1696 "traffic classification disabled!\n");
1701 /* Invalidated prio to tc mappings set to TC0 */
1702 for (i = 1; i < TC_BITMASK + 1; i++) {
1703 int q = netdev_get_prio_tc_map(dev, i);
1705 tc = &dev->tc_to_txq[q];
1706 if (tc->offset + tc->count > txq) {
1707 pr_warning("Number of in use tx queues "
1708 "changed. Priority %i to tc "
1709 "mapping %i is no longer valid "
1710 "setting map to 0\n",
1712 netdev_set_prio_tc_map(dev, i, 0);
1718 * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
1719 * greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
1721 int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq)
1725 if (txq < 1 || txq > dev->num_tx_queues)
1728 if (dev->reg_state == NETREG_REGISTERED ||
1729 dev->reg_state == NETREG_UNREGISTERING) {
1732 rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues,
1738 netif_setup_tc(dev, txq);
1740 if (txq < dev->real_num_tx_queues)
1741 qdisc_reset_all_tx_gt(dev, txq);
1744 dev->real_num_tx_queues = txq;
1747 EXPORT_SYMBOL(netif_set_real_num_tx_queues);
1751 * netif_set_real_num_rx_queues - set actual number of RX queues used
1752 * @dev: Network device
1753 * @rxq: Actual number of RX queues
1755 * This must be called either with the rtnl_lock held or before
1756 * registration of the net device. Returns 0 on success, or a
1757 * negative error code. If called before registration, it always
1760 int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq)
1764 if (rxq < 1 || rxq > dev->num_rx_queues)
1767 if (dev->reg_state == NETREG_REGISTERED) {
1770 rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues,
1776 dev->real_num_rx_queues = rxq;
1779 EXPORT_SYMBOL(netif_set_real_num_rx_queues);
1782 static inline void __netif_reschedule(struct Qdisc *q)
1784 struct softnet_data *sd;
1785 unsigned long flags;
1787 local_irq_save(flags);
1788 sd = &__get_cpu_var(softnet_data);
1789 q->next_sched = NULL;
1790 *sd->output_queue_tailp = q;
1791 sd->output_queue_tailp = &q->next_sched;
1792 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1793 local_irq_restore(flags);
1796 void __netif_schedule(struct Qdisc *q)
1798 if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
1799 __netif_reschedule(q);
1801 EXPORT_SYMBOL(__netif_schedule);
1803 void dev_kfree_skb_irq(struct sk_buff *skb)
1805 if (atomic_dec_and_test(&skb->users)) {
1806 struct softnet_data *sd;
1807 unsigned long flags;
1809 local_irq_save(flags);
1810 sd = &__get_cpu_var(softnet_data);
1811 skb->next = sd->completion_queue;
1812 sd->completion_queue = skb;
1813 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1814 local_irq_restore(flags);
1817 EXPORT_SYMBOL(dev_kfree_skb_irq);
1819 void dev_kfree_skb_any(struct sk_buff *skb)
1821 if (in_irq() || irqs_disabled())
1822 dev_kfree_skb_irq(skb);
1826 EXPORT_SYMBOL(dev_kfree_skb_any);
1830 * netif_device_detach - mark device as removed
1831 * @dev: network device
1833 * Mark device as removed from system and therefore no longer available.
1835 void netif_device_detach(struct net_device *dev)
1837 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
1838 netif_running(dev)) {
1839 netif_tx_stop_all_queues(dev);
1842 EXPORT_SYMBOL(netif_device_detach);
1845 * netif_device_attach - mark device as attached
1846 * @dev: network device
1848 * Mark device as attached from system and restart if needed.
1850 void netif_device_attach(struct net_device *dev)
1852 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
1853 netif_running(dev)) {
1854 netif_tx_wake_all_queues(dev);
1855 __netdev_watchdog_up(dev);
1858 EXPORT_SYMBOL(netif_device_attach);
1861 * skb_dev_set -- assign a new device to a buffer
1862 * @skb: buffer for the new device
1863 * @dev: network device
1865 * If an skb is owned by a device already, we have to reset
1866 * all data private to the namespace a device belongs to
1867 * before assigning it a new device.
1869 #ifdef CONFIG_NET_NS
1870 void skb_set_dev(struct sk_buff *skb, struct net_device *dev)
1873 if (skb->dev && !net_eq(dev_net(skb->dev), dev_net(dev))) {
1876 skb_init_secmark(skb);
1880 skb->ipvs_property = 0;
1881 #ifdef CONFIG_NET_SCHED
1887 EXPORT_SYMBOL(skb_set_dev);
1888 #endif /* CONFIG_NET_NS */
1890 static void skb_warn_bad_offload(const struct sk_buff *skb)
1892 struct net_device *dev = skb->dev;
1893 const char *driver = "";
1895 if (dev && dev->dev.parent)
1896 driver = dev_driver_string(dev->dev.parent);
1898 WARN(1, "%s: caps=(%pNF, %pNF) len=%d data_len=%d gso_size=%d "
1899 "gso_type=%d ip_summed=%d\n",
1900 driver, dev ? &dev->features : NULL,
1901 skb->sk ? &skb->sk->sk_route_caps : NULL,
1902 skb->len, skb->data_len, skb_shinfo(skb)->gso_size,
1903 skb_shinfo(skb)->gso_type, skb->ip_summed);
1907 * Invalidate hardware checksum when packet is to be mangled, and
1908 * complete checksum manually on outgoing path.
1910 int skb_checksum_help(struct sk_buff *skb)
1913 int ret = 0, offset;
1915 if (skb->ip_summed == CHECKSUM_COMPLETE)
1916 goto out_set_summed;
1918 if (unlikely(skb_shinfo(skb)->gso_size)) {
1919 skb_warn_bad_offload(skb);
1923 offset = skb_checksum_start_offset(skb);
1924 BUG_ON(offset >= skb_headlen(skb));
1925 csum = skb_checksum(skb, offset, skb->len - offset, 0);
1927 offset += skb->csum_offset;
1928 BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
1930 if (skb_cloned(skb) &&
1931 !skb_clone_writable(skb, offset + sizeof(__sum16))) {
1932 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1937 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1939 skb->ip_summed = CHECKSUM_NONE;
1943 EXPORT_SYMBOL(skb_checksum_help);
1946 * skb_gso_segment - Perform segmentation on skb.
1947 * @skb: buffer to segment
1948 * @features: features for the output path (see dev->features)
1950 * This function segments the given skb and returns a list of segments.
1952 * It may return NULL if the skb requires no segmentation. This is
1953 * only possible when GSO is used for verifying header integrity.
1955 struct sk_buff *skb_gso_segment(struct sk_buff *skb,
1956 netdev_features_t features)
1958 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
1959 struct packet_type *ptype;
1960 __be16 type = skb->protocol;
1961 int vlan_depth = ETH_HLEN;
1964 while (type == htons(ETH_P_8021Q)) {
1965 struct vlan_hdr *vh;
1967 if (unlikely(!pskb_may_pull(skb, vlan_depth + VLAN_HLEN)))
1968 return ERR_PTR(-EINVAL);
1970 vh = (struct vlan_hdr *)(skb->data + vlan_depth);
1971 type = vh->h_vlan_encapsulated_proto;
1972 vlan_depth += VLAN_HLEN;
1975 skb_reset_mac_header(skb);
1976 skb->mac_len = skb->network_header - skb->mac_header;
1977 __skb_pull(skb, skb->mac_len);
1979 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1980 skb_warn_bad_offload(skb);
1982 if (skb_header_cloned(skb) &&
1983 (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
1984 return ERR_PTR(err);
1988 list_for_each_entry_rcu(ptype,
1989 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
1990 if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1991 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1992 err = ptype->gso_send_check(skb);
1993 segs = ERR_PTR(err);
1994 if (err || skb_gso_ok(skb, features))
1996 __skb_push(skb, (skb->data -
1997 skb_network_header(skb)));
1999 segs = ptype->gso_segment(skb, features);
2005 __skb_push(skb, skb->data - skb_mac_header(skb));
2009 EXPORT_SYMBOL(skb_gso_segment);
2011 /* Take action when hardware reception checksum errors are detected. */
2013 void netdev_rx_csum_fault(struct net_device *dev)
2015 if (net_ratelimit()) {
2016 printk(KERN_ERR "%s: hw csum failure.\n",
2017 dev ? dev->name : "<unknown>");
2021 EXPORT_SYMBOL(netdev_rx_csum_fault);
2024 /* Actually, we should eliminate this check as soon as we know, that:
2025 * 1. IOMMU is present and allows to map all the memory.
2026 * 2. No high memory really exists on this machine.
2029 static int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
2031 #ifdef CONFIG_HIGHMEM
2033 if (!(dev->features & NETIF_F_HIGHDMA)) {
2034 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
2035 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
2036 if (PageHighMem(skb_frag_page(frag)))
2041 if (PCI_DMA_BUS_IS_PHYS) {
2042 struct device *pdev = dev->dev.parent;
2046 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
2047 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
2048 dma_addr_t addr = page_to_phys(skb_frag_page(frag));
2049 if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask)
2058 void (*destructor)(struct sk_buff *skb);
2061 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
2063 static void dev_gso_skb_destructor(struct sk_buff *skb)
2065 struct dev_gso_cb *cb;
2068 struct sk_buff *nskb = skb->next;
2070 skb->next = nskb->next;
2073 } while (skb->next);
2075 cb = DEV_GSO_CB(skb);
2077 cb->destructor(skb);
2081 * dev_gso_segment - Perform emulated hardware segmentation on skb.
2082 * @skb: buffer to segment
2083 * @features: device features as applicable to this skb
2085 * This function segments the given skb and stores the list of segments
2088 static int dev_gso_segment(struct sk_buff *skb, netdev_features_t features)
2090 struct sk_buff *segs;
2092 segs = skb_gso_segment(skb, features);
2094 /* Verifying header integrity only. */
2099 return PTR_ERR(segs);
2102 DEV_GSO_CB(skb)->destructor = skb->destructor;
2103 skb->destructor = dev_gso_skb_destructor;
2109 * Try to orphan skb early, right before transmission by the device.
2110 * We cannot orphan skb if tx timestamp is requested or the sk-reference
2111 * is needed on driver level for other reasons, e.g. see net/can/raw.c
2113 static inline void skb_orphan_try(struct sk_buff *skb)
2115 struct sock *sk = skb->sk;
2117 if (sk && !skb_shinfo(skb)->tx_flags) {
2118 /* skb_tx_hash() wont be able to get sk.
2119 * We copy sk_hash into skb->rxhash
2122 skb->rxhash = sk->sk_hash;
2127 static bool can_checksum_protocol(netdev_features_t features, __be16 protocol)
2129 return ((features & NETIF_F_GEN_CSUM) ||
2130 ((features & NETIF_F_V4_CSUM) &&
2131 protocol == htons(ETH_P_IP)) ||
2132 ((features & NETIF_F_V6_CSUM) &&
2133 protocol == htons(ETH_P_IPV6)) ||
2134 ((features & NETIF_F_FCOE_CRC) &&
2135 protocol == htons(ETH_P_FCOE)));
2138 static netdev_features_t harmonize_features(struct sk_buff *skb,
2139 __be16 protocol, netdev_features_t features)
2141 if (!can_checksum_protocol(features, protocol)) {
2142 features &= ~NETIF_F_ALL_CSUM;
2143 features &= ~NETIF_F_SG;
2144 } else if (illegal_highdma(skb->dev, skb)) {
2145 features &= ~NETIF_F_SG;
2151 netdev_features_t netif_skb_features(struct sk_buff *skb)
2153 __be16 protocol = skb->protocol;
2154 netdev_features_t features = skb->dev->features;
2156 if (protocol == htons(ETH_P_8021Q)) {
2157 struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
2158 protocol = veh->h_vlan_encapsulated_proto;
2159 } else if (!vlan_tx_tag_present(skb)) {
2160 return harmonize_features(skb, protocol, features);
2163 features &= (skb->dev->vlan_features | NETIF_F_HW_VLAN_TX);
2165 if (protocol != htons(ETH_P_8021Q)) {
2166 return harmonize_features(skb, protocol, features);
2168 features &= NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST |
2169 NETIF_F_GEN_CSUM | NETIF_F_HW_VLAN_TX;
2170 return harmonize_features(skb, protocol, features);
2173 EXPORT_SYMBOL(netif_skb_features);
2176 * Returns true if either:
2177 * 1. skb has frag_list and the device doesn't support FRAGLIST, or
2178 * 2. skb is fragmented and the device does not support SG, or if
2179 * at least one of fragments is in highmem and device does not
2180 * support DMA from it.
2182 static inline int skb_needs_linearize(struct sk_buff *skb,
2185 return skb_is_nonlinear(skb) &&
2186 ((skb_has_frag_list(skb) &&
2187 !(features & NETIF_F_FRAGLIST)) ||
2188 (skb_shinfo(skb)->nr_frags &&
2189 !(features & NETIF_F_SG)));
2192 int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
2193 struct netdev_queue *txq)
2195 const struct net_device_ops *ops = dev->netdev_ops;
2196 int rc = NETDEV_TX_OK;
2197 unsigned int skb_len;
2199 if (likely(!skb->next)) {
2200 netdev_features_t features;
2203 * If device doesn't need skb->dst, release it right now while
2204 * its hot in this cpu cache
2206 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
2209 if (!list_empty(&ptype_all))
2210 dev_queue_xmit_nit(skb, dev);
2212 skb_orphan_try(skb);
2214 features = netif_skb_features(skb);
2216 if (vlan_tx_tag_present(skb) &&
2217 !(features & NETIF_F_HW_VLAN_TX)) {
2218 skb = __vlan_put_tag(skb, vlan_tx_tag_get(skb));
2225 if (netif_needs_gso(skb, features)) {
2226 if (unlikely(dev_gso_segment(skb, features)))
2231 if (skb_needs_linearize(skb, features) &&
2232 __skb_linearize(skb))
2235 /* If packet is not checksummed and device does not
2236 * support checksumming for this protocol, complete
2237 * checksumming here.
2239 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2240 skb_set_transport_header(skb,
2241 skb_checksum_start_offset(skb));
2242 if (!(features & NETIF_F_ALL_CSUM) &&
2243 skb_checksum_help(skb))
2249 rc = ops->ndo_start_xmit(skb, dev);
2250 trace_net_dev_xmit(skb, rc, dev, skb_len);
2251 if (rc == NETDEV_TX_OK)
2252 txq_trans_update(txq);
2258 struct sk_buff *nskb = skb->next;
2260 skb->next = nskb->next;
2264 * If device doesn't need nskb->dst, release it right now while
2265 * its hot in this cpu cache
2267 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
2270 skb_len = nskb->len;
2271 rc = ops->ndo_start_xmit(nskb, dev);
2272 trace_net_dev_xmit(nskb, rc, dev, skb_len);
2273 if (unlikely(rc != NETDEV_TX_OK)) {
2274 if (rc & ~NETDEV_TX_MASK)
2275 goto out_kfree_gso_skb;
2276 nskb->next = skb->next;
2280 txq_trans_update(txq);
2281 if (unlikely(netif_xmit_stopped(txq) && skb->next))
2282 return NETDEV_TX_BUSY;
2283 } while (skb->next);
2286 if (likely(skb->next == NULL))
2287 skb->destructor = DEV_GSO_CB(skb)->destructor;
2294 static u32 hashrnd __read_mostly;
2297 * Returns a Tx hash based on the given packet descriptor a Tx queues' number
2298 * to be used as a distribution range.
2300 u16 __skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb,
2301 unsigned int num_tx_queues)
2305 u16 qcount = num_tx_queues;
2307 if (skb_rx_queue_recorded(skb)) {
2308 hash = skb_get_rx_queue(skb);
2309 while (unlikely(hash >= num_tx_queues))
2310 hash -= num_tx_queues;
2315 u8 tc = netdev_get_prio_tc_map(dev, skb->priority);
2316 qoffset = dev->tc_to_txq[tc].offset;
2317 qcount = dev->tc_to_txq[tc].count;
2320 if (skb->sk && skb->sk->sk_hash)
2321 hash = skb->sk->sk_hash;
2323 hash = (__force u16) skb->protocol ^ skb->rxhash;
2324 hash = jhash_1word(hash, hashrnd);
2326 return (u16) (((u64) hash * qcount) >> 32) + qoffset;
2328 EXPORT_SYMBOL(__skb_tx_hash);
2330 static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index)
2332 if (unlikely(queue_index >= dev->real_num_tx_queues)) {
2333 if (net_ratelimit()) {
2334 pr_warning("%s selects TX queue %d, but "
2335 "real number of TX queues is %d\n",
2336 dev->name, queue_index, dev->real_num_tx_queues);
2343 static inline int get_xps_queue(struct net_device *dev, struct sk_buff *skb)
2346 struct xps_dev_maps *dev_maps;
2347 struct xps_map *map;
2348 int queue_index = -1;
2351 dev_maps = rcu_dereference(dev->xps_maps);
2353 map = rcu_dereference(
2354 dev_maps->cpu_map[raw_smp_processor_id()]);
2357 queue_index = map->queues[0];
2360 if (skb->sk && skb->sk->sk_hash)
2361 hash = skb->sk->sk_hash;
2363 hash = (__force u16) skb->protocol ^
2365 hash = jhash_1word(hash, hashrnd);
2366 queue_index = map->queues[
2367 ((u64)hash * map->len) >> 32];
2369 if (unlikely(queue_index >= dev->real_num_tx_queues))
2381 static struct netdev_queue *dev_pick_tx(struct net_device *dev,
2382 struct sk_buff *skb)
2385 const struct net_device_ops *ops = dev->netdev_ops;
2387 if (dev->real_num_tx_queues == 1)
2389 else if (ops->ndo_select_queue) {
2390 queue_index = ops->ndo_select_queue(dev, skb);
2391 queue_index = dev_cap_txqueue(dev, queue_index);
2393 struct sock *sk = skb->sk;
2394 queue_index = sk_tx_queue_get(sk);
2396 if (queue_index < 0 || skb->ooo_okay ||
2397 queue_index >= dev->real_num_tx_queues) {
2398 int old_index = queue_index;
2400 queue_index = get_xps_queue(dev, skb);
2401 if (queue_index < 0)
2402 queue_index = skb_tx_hash(dev, skb);
2404 if (queue_index != old_index && sk) {
2405 struct dst_entry *dst =
2406 rcu_dereference_check(sk->sk_dst_cache, 1);
2408 if (dst && skb_dst(skb) == dst)
2409 sk_tx_queue_set(sk, queue_index);
2414 skb_set_queue_mapping(skb, queue_index);
2415 return netdev_get_tx_queue(dev, queue_index);
2418 static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
2419 struct net_device *dev,
2420 struct netdev_queue *txq)
2422 spinlock_t *root_lock = qdisc_lock(q);
2426 qdisc_skb_cb(skb)->pkt_len = skb->len;
2427 qdisc_calculate_pkt_len(skb, q);
2429 * Heuristic to force contended enqueues to serialize on a
2430 * separate lock before trying to get qdisc main lock.
2431 * This permits __QDISC_STATE_RUNNING owner to get the lock more often
2432 * and dequeue packets faster.
2434 contended = qdisc_is_running(q);
2435 if (unlikely(contended))
2436 spin_lock(&q->busylock);
2438 spin_lock(root_lock);
2439 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
2442 } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) &&
2443 qdisc_run_begin(q)) {
2445 * This is a work-conserving queue; there are no old skbs
2446 * waiting to be sent out; and the qdisc is not running -
2447 * xmit the skb directly.
2449 if (!(dev->priv_flags & IFF_XMIT_DST_RELEASE))
2452 qdisc_bstats_update(q, skb);
2454 if (sch_direct_xmit(skb, q, dev, txq, root_lock)) {
2455 if (unlikely(contended)) {
2456 spin_unlock(&q->busylock);
2463 rc = NET_XMIT_SUCCESS;
2466 rc = q->enqueue(skb, q) & NET_XMIT_MASK;
2467 if (qdisc_run_begin(q)) {
2468 if (unlikely(contended)) {
2469 spin_unlock(&q->busylock);
2475 spin_unlock(root_lock);
2476 if (unlikely(contended))
2477 spin_unlock(&q->busylock);
2481 #if IS_ENABLED(CONFIG_NETPRIO_CGROUP)
2482 static void skb_update_prio(struct sk_buff *skb)
2484 struct netprio_map *map = rcu_dereference_bh(skb->dev->priomap);
2486 if ((!skb->priority) && (skb->sk) && map)
2487 skb->priority = map->priomap[skb->sk->sk_cgrp_prioidx];
2490 #define skb_update_prio(skb)
2493 static DEFINE_PER_CPU(int, xmit_recursion);
2494 #define RECURSION_LIMIT 10
2497 * dev_queue_xmit - transmit a buffer
2498 * @skb: buffer to transmit
2500 * Queue a buffer for transmission to a network device. The caller must
2501 * have set the device and priority and built the buffer before calling
2502 * this function. The function can be called from an interrupt.
2504 * A negative errno code is returned on a failure. A success does not
2505 * guarantee the frame will be transmitted as it may be dropped due
2506 * to congestion or traffic shaping.
2508 * -----------------------------------------------------------------------------------
2509 * I notice this method can also return errors from the queue disciplines,
2510 * including NET_XMIT_DROP, which is a positive value. So, errors can also
2513 * Regardless of the return value, the skb is consumed, so it is currently
2514 * difficult to retry a send to this method. (You can bump the ref count
2515 * before sending to hold a reference for retry if you are careful.)
2517 * When calling this method, interrupts MUST be enabled. This is because
2518 * the BH enable code must have IRQs enabled so that it will not deadlock.
2521 int dev_queue_xmit(struct sk_buff *skb)
2523 struct net_device *dev = skb->dev;
2524 struct netdev_queue *txq;
2528 /* Disable soft irqs for various locks below. Also
2529 * stops preemption for RCU.
2533 skb_update_prio(skb);
2535 txq = dev_pick_tx(dev, skb);
2536 q = rcu_dereference_bh(txq->qdisc);
2538 #ifdef CONFIG_NET_CLS_ACT
2539 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS);
2541 trace_net_dev_queue(skb);
2543 rc = __dev_xmit_skb(skb, q, dev, txq);
2547 /* The device has no queue. Common case for software devices:
2548 loopback, all the sorts of tunnels...
2550 Really, it is unlikely that netif_tx_lock protection is necessary
2551 here. (f.e. loopback and IP tunnels are clean ignoring statistics
2553 However, it is possible, that they rely on protection
2556 Check this and shot the lock. It is not prone from deadlocks.
2557 Either shot noqueue qdisc, it is even simpler 8)
2559 if (dev->flags & IFF_UP) {
2560 int cpu = smp_processor_id(); /* ok because BHs are off */
2562 if (txq->xmit_lock_owner != cpu) {
2564 if (__this_cpu_read(xmit_recursion) > RECURSION_LIMIT)
2565 goto recursion_alert;
2567 HARD_TX_LOCK(dev, txq, cpu);
2569 if (!netif_xmit_stopped(txq)) {
2570 __this_cpu_inc(xmit_recursion);
2571 rc = dev_hard_start_xmit(skb, dev, txq);
2572 __this_cpu_dec(xmit_recursion);
2573 if (dev_xmit_complete(rc)) {
2574 HARD_TX_UNLOCK(dev, txq);
2578 HARD_TX_UNLOCK(dev, txq);
2579 if (net_ratelimit())
2580 printk(KERN_CRIT "Virtual device %s asks to "
2581 "queue packet!\n", dev->name);
2583 /* Recursion is detected! It is possible,
2587 if (net_ratelimit())
2588 printk(KERN_CRIT "Dead loop on virtual device "
2589 "%s, fix it urgently!\n", dev->name);
2594 rcu_read_unlock_bh();
2599 rcu_read_unlock_bh();
2602 EXPORT_SYMBOL(dev_queue_xmit);
2605 /*=======================================================================
2607 =======================================================================*/
2609 int netdev_max_backlog __read_mostly = 1000;
2610 int netdev_tstamp_prequeue __read_mostly = 1;
2611 int netdev_budget __read_mostly = 300;
2612 int weight_p __read_mostly = 64; /* old backlog weight */
2614 /* Called with irq disabled */
2615 static inline void ____napi_schedule(struct softnet_data *sd,
2616 struct napi_struct *napi)
2618 list_add_tail(&napi->poll_list, &sd->poll_list);
2619 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2623 * __skb_get_rxhash: calculate a flow hash based on src/dst addresses
2624 * and src/dst port numbers. Sets rxhash in skb to non-zero hash value
2625 * on success, zero indicates no valid hash. Also, sets l4_rxhash in skb
2626 * if hash is a canonical 4-tuple hash over transport ports.
2628 void __skb_get_rxhash(struct sk_buff *skb)
2630 struct flow_keys keys;
2633 if (!skb_flow_dissect(skb, &keys))
2637 if ((__force u16)keys.port16[1] < (__force u16)keys.port16[0])
2638 swap(keys.port16[0], keys.port16[1]);
2642 /* get a consistent hash (same value on both flow directions) */
2643 if ((__force u32)keys.dst < (__force u32)keys.src)
2644 swap(keys.dst, keys.src);
2646 hash = jhash_3words((__force u32)keys.dst,
2647 (__force u32)keys.src,
2648 (__force u32)keys.ports, hashrnd);
2654 EXPORT_SYMBOL(__skb_get_rxhash);
2658 /* One global table that all flow-based protocols share. */
2659 struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly;
2660 EXPORT_SYMBOL(rps_sock_flow_table);
2662 struct jump_label_key rps_needed __read_mostly;
2664 static struct rps_dev_flow *
2665 set_rps_cpu(struct net_device *dev, struct sk_buff *skb,
2666 struct rps_dev_flow *rflow, u16 next_cpu)
2668 if (next_cpu != RPS_NO_CPU) {
2669 #ifdef CONFIG_RFS_ACCEL
2670 struct netdev_rx_queue *rxqueue;
2671 struct rps_dev_flow_table *flow_table;
2672 struct rps_dev_flow *old_rflow;
2677 /* Should we steer this flow to a different hardware queue? */
2678 if (!skb_rx_queue_recorded(skb) || !dev->rx_cpu_rmap ||
2679 !(dev->features & NETIF_F_NTUPLE))
2681 rxq_index = cpu_rmap_lookup_index(dev->rx_cpu_rmap, next_cpu);
2682 if (rxq_index == skb_get_rx_queue(skb))
2685 rxqueue = dev->_rx + rxq_index;
2686 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2689 flow_id = skb->rxhash & flow_table->mask;
2690 rc = dev->netdev_ops->ndo_rx_flow_steer(dev, skb,
2691 rxq_index, flow_id);
2695 rflow = &flow_table->flows[flow_id];
2697 if (old_rflow->filter == rflow->filter)
2698 old_rflow->filter = RPS_NO_FILTER;
2702 per_cpu(softnet_data, next_cpu).input_queue_head;
2705 rflow->cpu = next_cpu;
2710 * get_rps_cpu is called from netif_receive_skb and returns the target
2711 * CPU from the RPS map of the receiving queue for a given skb.
2712 * rcu_read_lock must be held on entry.
2714 static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
2715 struct rps_dev_flow **rflowp)
2717 struct netdev_rx_queue *rxqueue;
2718 struct rps_map *map;
2719 struct rps_dev_flow_table *flow_table;
2720 struct rps_sock_flow_table *sock_flow_table;
2724 if (skb_rx_queue_recorded(skb)) {
2725 u16 index = skb_get_rx_queue(skb);
2726 if (unlikely(index >= dev->real_num_rx_queues)) {
2727 WARN_ONCE(dev->real_num_rx_queues > 1,
2728 "%s received packet on queue %u, but number "
2729 "of RX queues is %u\n",
2730 dev->name, index, dev->real_num_rx_queues);
2733 rxqueue = dev->_rx + index;
2737 map = rcu_dereference(rxqueue->rps_map);
2739 if (map->len == 1 &&
2740 !rcu_access_pointer(rxqueue->rps_flow_table)) {
2741 tcpu = map->cpus[0];
2742 if (cpu_online(tcpu))
2746 } else if (!rcu_access_pointer(rxqueue->rps_flow_table)) {
2750 skb_reset_network_header(skb);
2751 if (!skb_get_rxhash(skb))
2754 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2755 sock_flow_table = rcu_dereference(rps_sock_flow_table);
2756 if (flow_table && sock_flow_table) {
2758 struct rps_dev_flow *rflow;
2760 rflow = &flow_table->flows[skb->rxhash & flow_table->mask];
2763 next_cpu = sock_flow_table->ents[skb->rxhash &
2764 sock_flow_table->mask];
2767 * If the desired CPU (where last recvmsg was done) is
2768 * different from current CPU (one in the rx-queue flow
2769 * table entry), switch if one of the following holds:
2770 * - Current CPU is unset (equal to RPS_NO_CPU).
2771 * - Current CPU is offline.
2772 * - The current CPU's queue tail has advanced beyond the
2773 * last packet that was enqueued using this table entry.
2774 * This guarantees that all previous packets for the flow
2775 * have been dequeued, thus preserving in order delivery.
2777 if (unlikely(tcpu != next_cpu) &&
2778 (tcpu == RPS_NO_CPU || !cpu_online(tcpu) ||
2779 ((int)(per_cpu(softnet_data, tcpu).input_queue_head -
2780 rflow->last_qtail)) >= 0))
2781 rflow = set_rps_cpu(dev, skb, rflow, next_cpu);
2783 if (tcpu != RPS_NO_CPU && cpu_online(tcpu)) {
2791 tcpu = map->cpus[((u64) skb->rxhash * map->len) >> 32];
2793 if (cpu_online(tcpu)) {
2803 #ifdef CONFIG_RFS_ACCEL
2806 * rps_may_expire_flow - check whether an RFS hardware filter may be removed
2807 * @dev: Device on which the filter was set
2808 * @rxq_index: RX queue index
2809 * @flow_id: Flow ID passed to ndo_rx_flow_steer()
2810 * @filter_id: Filter ID returned by ndo_rx_flow_steer()
2812 * Drivers that implement ndo_rx_flow_steer() should periodically call
2813 * this function for each installed filter and remove the filters for
2814 * which it returns %true.
2816 bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index,
2817 u32 flow_id, u16 filter_id)
2819 struct netdev_rx_queue *rxqueue = dev->_rx + rxq_index;
2820 struct rps_dev_flow_table *flow_table;
2821 struct rps_dev_flow *rflow;
2826 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2827 if (flow_table && flow_id <= flow_table->mask) {
2828 rflow = &flow_table->flows[flow_id];
2829 cpu = ACCESS_ONCE(rflow->cpu);
2830 if (rflow->filter == filter_id && cpu != RPS_NO_CPU &&
2831 ((int)(per_cpu(softnet_data, cpu).input_queue_head -
2832 rflow->last_qtail) <
2833 (int)(10 * flow_table->mask)))
2839 EXPORT_SYMBOL(rps_may_expire_flow);
2841 #endif /* CONFIG_RFS_ACCEL */
2843 /* Called from hardirq (IPI) context */
2844 static void rps_trigger_softirq(void *data)
2846 struct softnet_data *sd = data;
2848 ____napi_schedule(sd, &sd->backlog);
2852 #endif /* CONFIG_RPS */
2855 * Check if this softnet_data structure is another cpu one
2856 * If yes, queue it to our IPI list and return 1
2859 static int rps_ipi_queued(struct softnet_data *sd)
2862 struct softnet_data *mysd = &__get_cpu_var(softnet_data);
2865 sd->rps_ipi_next = mysd->rps_ipi_list;
2866 mysd->rps_ipi_list = sd;
2868 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2871 #endif /* CONFIG_RPS */
2876 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
2877 * queue (may be a remote CPU queue).
2879 static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
2880 unsigned int *qtail)
2882 struct softnet_data *sd;
2883 unsigned long flags;
2885 sd = &per_cpu(softnet_data, cpu);
2887 local_irq_save(flags);
2890 if (skb_queue_len(&sd->input_pkt_queue) <= netdev_max_backlog) {
2891 if (skb_queue_len(&sd->input_pkt_queue)) {
2893 __skb_queue_tail(&sd->input_pkt_queue, skb);
2894 input_queue_tail_incr_save(sd, qtail);
2896 local_irq_restore(flags);
2897 return NET_RX_SUCCESS;
2900 /* Schedule NAPI for backlog device
2901 * We can use non atomic operation since we own the queue lock
2903 if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) {
2904 if (!rps_ipi_queued(sd))
2905 ____napi_schedule(sd, &sd->backlog);
2913 local_irq_restore(flags);
2915 atomic_long_inc(&skb->dev->rx_dropped);
2921 * netif_rx - post buffer to the network code
2922 * @skb: buffer to post
2924 * This function receives a packet from a device driver and queues it for
2925 * the upper (protocol) levels to process. It always succeeds. The buffer
2926 * may be dropped during processing for congestion control or by the
2930 * NET_RX_SUCCESS (no congestion)
2931 * NET_RX_DROP (packet was dropped)
2935 int netif_rx(struct sk_buff *skb)
2939 /* if netpoll wants it, pretend we never saw it */
2940 if (netpoll_rx(skb))
2943 net_timestamp_check(netdev_tstamp_prequeue, skb);
2945 trace_netif_rx(skb);
2947 if (static_branch(&rps_needed)) {
2948 struct rps_dev_flow voidflow, *rflow = &voidflow;
2954 cpu = get_rps_cpu(skb->dev, skb, &rflow);
2956 cpu = smp_processor_id();
2958 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
2966 ret = enqueue_to_backlog(skb, get_cpu(), &qtail);
2971 EXPORT_SYMBOL(netif_rx);
2973 int netif_rx_ni(struct sk_buff *skb)
2978 err = netif_rx(skb);
2979 if (local_softirq_pending())
2985 EXPORT_SYMBOL(netif_rx_ni);
2987 static void net_tx_action(struct softirq_action *h)
2989 struct softnet_data *sd = &__get_cpu_var(softnet_data);
2991 if (sd->completion_queue) {
2992 struct sk_buff *clist;
2994 local_irq_disable();
2995 clist = sd->completion_queue;
2996 sd->completion_queue = NULL;
3000 struct sk_buff *skb = clist;
3001 clist = clist->next;
3003 WARN_ON(atomic_read(&skb->users));
3004 trace_kfree_skb(skb, net_tx_action);
3009 if (sd->output_queue) {
3012 local_irq_disable();
3013 head = sd->output_queue;
3014 sd->output_queue = NULL;
3015 sd->output_queue_tailp = &sd->output_queue;
3019 struct Qdisc *q = head;
3020 spinlock_t *root_lock;
3022 head = head->next_sched;
3024 root_lock = qdisc_lock(q);
3025 if (spin_trylock(root_lock)) {
3026 smp_mb__before_clear_bit();
3027 clear_bit(__QDISC_STATE_SCHED,
3030 spin_unlock(root_lock);
3032 if (!test_bit(__QDISC_STATE_DEACTIVATED,
3034 __netif_reschedule(q);
3036 smp_mb__before_clear_bit();
3037 clear_bit(__QDISC_STATE_SCHED,
3045 #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
3046 (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
3047 /* This hook is defined here for ATM LANE */
3048 int (*br_fdb_test_addr_hook)(struct net_device *dev,
3049 unsigned char *addr) __read_mostly;
3050 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
3053 #ifdef CONFIG_NET_CLS_ACT
3054 /* TODO: Maybe we should just force sch_ingress to be compiled in
3055 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
3056 * a compare and 2 stores extra right now if we dont have it on
3057 * but have CONFIG_NET_CLS_ACT
3058 * NOTE: This doesn't stop any functionality; if you dont have
3059 * the ingress scheduler, you just can't add policies on ingress.
3062 static int ing_filter(struct sk_buff *skb, struct netdev_queue *rxq)
3064 struct net_device *dev = skb->dev;
3065 u32 ttl = G_TC_RTTL(skb->tc_verd);
3066 int result = TC_ACT_OK;
3069 if (unlikely(MAX_RED_LOOP < ttl++)) {
3070 if (net_ratelimit())
3071 pr_warning( "Redir loop detected Dropping packet (%d->%d)\n",
3072 skb->skb_iif, dev->ifindex);
3076 skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
3077 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
3080 if (q != &noop_qdisc) {
3081 spin_lock(qdisc_lock(q));
3082 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
3083 result = qdisc_enqueue_root(skb, q);
3084 spin_unlock(qdisc_lock(q));
3090 static inline struct sk_buff *handle_ing(struct sk_buff *skb,
3091 struct packet_type **pt_prev,
3092 int *ret, struct net_device *orig_dev)
3094 struct netdev_queue *rxq = rcu_dereference(skb->dev->ingress_queue);
3096 if (!rxq || rxq->qdisc == &noop_qdisc)
3100 *ret = deliver_skb(skb, *pt_prev, orig_dev);
3104 switch (ing_filter(skb, rxq)) {
3118 * netdev_rx_handler_register - register receive handler
3119 * @dev: device to register a handler for
3120 * @rx_handler: receive handler to register
3121 * @rx_handler_data: data pointer that is used by rx handler
3123 * Register a receive hander for a device. This handler will then be
3124 * called from __netif_receive_skb. A negative errno code is returned
3127 * The caller must hold the rtnl_mutex.
3129 * For a general description of rx_handler, see enum rx_handler_result.
3131 int netdev_rx_handler_register(struct net_device *dev,
3132 rx_handler_func_t *rx_handler,
3133 void *rx_handler_data)
3137 if (dev->rx_handler)
3140 rcu_assign_pointer(dev->rx_handler_data, rx_handler_data);
3141 rcu_assign_pointer(dev->rx_handler, rx_handler);
3145 EXPORT_SYMBOL_GPL(netdev_rx_handler_register);
3148 * netdev_rx_handler_unregister - unregister receive handler
3149 * @dev: device to unregister a handler from
3151 * Unregister a receive hander from a device.
3153 * The caller must hold the rtnl_mutex.
3155 void netdev_rx_handler_unregister(struct net_device *dev)
3159 RCU_INIT_POINTER(dev->rx_handler, NULL);
3160 RCU_INIT_POINTER(dev->rx_handler_data, NULL);
3162 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister);
3164 static int __netif_receive_skb(struct sk_buff *skb)
3166 struct packet_type *ptype, *pt_prev;
3167 rx_handler_func_t *rx_handler;
3168 struct net_device *orig_dev;
3169 struct net_device *null_or_dev;
3170 bool deliver_exact = false;
3171 int ret = NET_RX_DROP;
3174 net_timestamp_check(!netdev_tstamp_prequeue, skb);
3176 trace_netif_receive_skb(skb);
3178 /* if we've gotten here through NAPI, check netpoll */
3179 if (netpoll_receive_skb(skb))
3183 skb->skb_iif = skb->dev->ifindex;
3184 orig_dev = skb->dev;
3186 skb_reset_network_header(skb);
3187 skb_reset_transport_header(skb);
3188 skb_reset_mac_len(skb);
3196 __this_cpu_inc(softnet_data.processed);
3198 if (skb->protocol == cpu_to_be16(ETH_P_8021Q)) {
3199 skb = vlan_untag(skb);
3204 #ifdef CONFIG_NET_CLS_ACT
3205 if (skb->tc_verd & TC_NCLS) {
3206 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
3211 list_for_each_entry_rcu(ptype, &ptype_all, list) {
3212 if (!ptype->dev || ptype->dev == skb->dev) {
3214 ret = deliver_skb(skb, pt_prev, orig_dev);
3219 #ifdef CONFIG_NET_CLS_ACT
3220 skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
3226 rx_handler = rcu_dereference(skb->dev->rx_handler);
3227 if (vlan_tx_tag_present(skb)) {
3229 ret = deliver_skb(skb, pt_prev, orig_dev);
3232 if (vlan_do_receive(&skb, !rx_handler))
3234 else if (unlikely(!skb))
3240 ret = deliver_skb(skb, pt_prev, orig_dev);
3243 switch (rx_handler(&skb)) {
3244 case RX_HANDLER_CONSUMED:
3246 case RX_HANDLER_ANOTHER:
3248 case RX_HANDLER_EXACT:
3249 deliver_exact = true;
3250 case RX_HANDLER_PASS:
3257 /* deliver only exact match when indicated */
3258 null_or_dev = deliver_exact ? skb->dev : NULL;
3260 type = skb->protocol;
3261 list_for_each_entry_rcu(ptype,
3262 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
3263 if (ptype->type == type &&
3264 (ptype->dev == null_or_dev || ptype->dev == skb->dev ||
3265 ptype->dev == orig_dev)) {
3267 ret = deliver_skb(skb, pt_prev, orig_dev);
3273 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
3275 atomic_long_inc(&skb->dev->rx_dropped);
3277 /* Jamal, now you will not able to escape explaining
3278 * me how you were going to use this. :-)
3289 * netif_receive_skb - process receive buffer from network
3290 * @skb: buffer to process
3292 * netif_receive_skb() is the main receive data processing function.
3293 * It always succeeds. The buffer may be dropped during processing
3294 * for congestion control or by the protocol layers.
3296 * This function may only be called from softirq context and interrupts
3297 * should be enabled.
3299 * Return values (usually ignored):
3300 * NET_RX_SUCCESS: no congestion
3301 * NET_RX_DROP: packet was dropped
3303 int netif_receive_skb(struct sk_buff *skb)
3305 net_timestamp_check(netdev_tstamp_prequeue, skb);
3307 if (skb_defer_rx_timestamp(skb))
3308 return NET_RX_SUCCESS;
3311 if (static_branch(&rps_needed)) {
3312 struct rps_dev_flow voidflow, *rflow = &voidflow;
3317 cpu = get_rps_cpu(skb->dev, skb, &rflow);
3320 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
3327 return __netif_receive_skb(skb);
3329 EXPORT_SYMBOL(netif_receive_skb);
3331 /* Network device is going away, flush any packets still pending
3332 * Called with irqs disabled.
3334 static void flush_backlog(void *arg)
3336 struct net_device *dev = arg;
3337 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3338 struct sk_buff *skb, *tmp;
3341 skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) {
3342 if (skb->dev == dev) {
3343 __skb_unlink(skb, &sd->input_pkt_queue);
3345 input_queue_head_incr(sd);
3350 skb_queue_walk_safe(&sd->process_queue, skb, tmp) {
3351 if (skb->dev == dev) {
3352 __skb_unlink(skb, &sd->process_queue);
3354 input_queue_head_incr(sd);
3359 static int napi_gro_complete(struct sk_buff *skb)
3361 struct packet_type *ptype;
3362 __be16 type = skb->protocol;
3363 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
3366 if (NAPI_GRO_CB(skb)->count == 1) {
3367 skb_shinfo(skb)->gso_size = 0;
3372 list_for_each_entry_rcu(ptype, head, list) {
3373 if (ptype->type != type || ptype->dev || !ptype->gro_complete)
3376 err = ptype->gro_complete(skb);
3382 WARN_ON(&ptype->list == head);
3384 return NET_RX_SUCCESS;
3388 return netif_receive_skb(skb);
3391 inline void napi_gro_flush(struct napi_struct *napi)
3393 struct sk_buff *skb, *next;
3395 for (skb = napi->gro_list; skb; skb = next) {
3398 napi_gro_complete(skb);
3401 napi->gro_count = 0;
3402 napi->gro_list = NULL;
3404 EXPORT_SYMBOL(napi_gro_flush);
3406 enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3408 struct sk_buff **pp = NULL;
3409 struct packet_type *ptype;
3410 __be16 type = skb->protocol;
3411 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
3414 enum gro_result ret;
3416 if (!(skb->dev->features & NETIF_F_GRO) || netpoll_rx_on(skb))
3419 if (skb_is_gso(skb) || skb_has_frag_list(skb))
3423 list_for_each_entry_rcu(ptype, head, list) {
3424 if (ptype->type != type || ptype->dev || !ptype->gro_receive)
3427 skb_set_network_header(skb, skb_gro_offset(skb));
3428 mac_len = skb->network_header - skb->mac_header;
3429 skb->mac_len = mac_len;
3430 NAPI_GRO_CB(skb)->same_flow = 0;
3431 NAPI_GRO_CB(skb)->flush = 0;
3432 NAPI_GRO_CB(skb)->free = 0;
3434 pp = ptype->gro_receive(&napi->gro_list, skb);
3439 if (&ptype->list == head)
3442 same_flow = NAPI_GRO_CB(skb)->same_flow;
3443 ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
3446 struct sk_buff *nskb = *pp;
3450 napi_gro_complete(nskb);
3457 if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS)
3461 NAPI_GRO_CB(skb)->count = 1;
3462 skb_shinfo(skb)->gso_size = skb_gro_len(skb);
3463 skb->next = napi->gro_list;
3464 napi->gro_list = skb;
3468 if (skb_headlen(skb) < skb_gro_offset(skb)) {
3469 int grow = skb_gro_offset(skb) - skb_headlen(skb);
3471 BUG_ON(skb->end - skb->tail < grow);
3473 memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);
3476 skb->data_len -= grow;
3478 skb_shinfo(skb)->frags[0].page_offset += grow;
3479 skb_frag_size_sub(&skb_shinfo(skb)->frags[0], grow);
3481 if (unlikely(!skb_frag_size(&skb_shinfo(skb)->frags[0]))) {
3482 skb_frag_unref(skb, 0);
3483 memmove(skb_shinfo(skb)->frags,
3484 skb_shinfo(skb)->frags + 1,
3485 --skb_shinfo(skb)->nr_frags * sizeof(skb_frag_t));
3496 EXPORT_SYMBOL(dev_gro_receive);
3498 static inline gro_result_t
3499 __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3503 for (p = napi->gro_list; p; p = p->next) {
3504 unsigned long diffs;
3506 diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev;
3507 diffs |= p->vlan_tci ^ skb->vlan_tci;
3508 diffs |= compare_ether_header(skb_mac_header(p),
3509 skb_gro_mac_header(skb));
3510 NAPI_GRO_CB(p)->same_flow = !diffs;
3511 NAPI_GRO_CB(p)->flush = 0;
3514 return dev_gro_receive(napi, skb);
3517 gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
3521 if (netif_receive_skb(skb))
3526 case GRO_MERGED_FREE:
3537 EXPORT_SYMBOL(napi_skb_finish);
3539 void skb_gro_reset_offset(struct sk_buff *skb)
3541 NAPI_GRO_CB(skb)->data_offset = 0;
3542 NAPI_GRO_CB(skb)->frag0 = NULL;
3543 NAPI_GRO_CB(skb)->frag0_len = 0;
3545 if (skb->mac_header == skb->tail &&
3546 !PageHighMem(skb_frag_page(&skb_shinfo(skb)->frags[0]))) {
3547 NAPI_GRO_CB(skb)->frag0 =
3548 skb_frag_address(&skb_shinfo(skb)->frags[0]);
3549 NAPI_GRO_CB(skb)->frag0_len = skb_frag_size(&skb_shinfo(skb)->frags[0]);
3552 EXPORT_SYMBOL(skb_gro_reset_offset);
3554 gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3556 skb_gro_reset_offset(skb);
3558 return napi_skb_finish(__napi_gro_receive(napi, skb), skb);
3560 EXPORT_SYMBOL(napi_gro_receive);
3562 static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
3564 __skb_pull(skb, skb_headlen(skb));
3565 skb_reserve(skb, NET_IP_ALIGN - skb_headroom(skb));
3567 skb->dev = napi->dev;
3573 struct sk_buff *napi_get_frags(struct napi_struct *napi)
3575 struct sk_buff *skb = napi->skb;
3578 skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD);
3584 EXPORT_SYMBOL(napi_get_frags);
3586 gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb,
3592 skb->protocol = eth_type_trans(skb, skb->dev);
3594 if (ret == GRO_HELD)
3595 skb_gro_pull(skb, -ETH_HLEN);
3596 else if (netif_receive_skb(skb))
3601 case GRO_MERGED_FREE:
3602 napi_reuse_skb(napi, skb);
3611 EXPORT_SYMBOL(napi_frags_finish);
3613 struct sk_buff *napi_frags_skb(struct napi_struct *napi)
3615 struct sk_buff *skb = napi->skb;
3622 skb_reset_mac_header(skb);
3623 skb_gro_reset_offset(skb);
3625 off = skb_gro_offset(skb);
3626 hlen = off + sizeof(*eth);
3627 eth = skb_gro_header_fast(skb, off);
3628 if (skb_gro_header_hard(skb, hlen)) {
3629 eth = skb_gro_header_slow(skb, hlen, off);
3630 if (unlikely(!eth)) {
3631 napi_reuse_skb(napi, skb);
3637 skb_gro_pull(skb, sizeof(*eth));
3640 * This works because the only protocols we care about don't require
3641 * special handling. We'll fix it up properly at the end.
3643 skb->protocol = eth->h_proto;
3648 EXPORT_SYMBOL(napi_frags_skb);
3650 gro_result_t napi_gro_frags(struct napi_struct *napi)
3652 struct sk_buff *skb = napi_frags_skb(napi);
3657 return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb));
3659 EXPORT_SYMBOL(napi_gro_frags);
3662 * net_rps_action sends any pending IPI's for rps.
3663 * Note: called with local irq disabled, but exits with local irq enabled.
3665 static void net_rps_action_and_irq_enable(struct softnet_data *sd)
3668 struct softnet_data *remsd = sd->rps_ipi_list;
3671 sd->rps_ipi_list = NULL;
3675 /* Send pending IPI's to kick RPS processing on remote cpus. */
3677 struct softnet_data *next = remsd->rps_ipi_next;
3679 if (cpu_online(remsd->cpu))
3680 __smp_call_function_single(remsd->cpu,
3689 static int process_backlog(struct napi_struct *napi, int quota)
3692 struct softnet_data *sd = container_of(napi, struct softnet_data, backlog);
3695 /* Check if we have pending ipi, its better to send them now,
3696 * not waiting net_rx_action() end.
3698 if (sd->rps_ipi_list) {
3699 local_irq_disable();
3700 net_rps_action_and_irq_enable(sd);
3703 napi->weight = weight_p;
3704 local_irq_disable();
3705 while (work < quota) {
3706 struct sk_buff *skb;
3709 while ((skb = __skb_dequeue(&sd->process_queue))) {
3711 __netif_receive_skb(skb);
3712 local_irq_disable();
3713 input_queue_head_incr(sd);
3714 if (++work >= quota) {
3721 qlen = skb_queue_len(&sd->input_pkt_queue);
3723 skb_queue_splice_tail_init(&sd->input_pkt_queue,
3724 &sd->process_queue);
3726 if (qlen < quota - work) {
3728 * Inline a custom version of __napi_complete().
3729 * only current cpu owns and manipulates this napi,
3730 * and NAPI_STATE_SCHED is the only possible flag set on backlog.
3731 * we can use a plain write instead of clear_bit(),
3732 * and we dont need an smp_mb() memory barrier.
3734 list_del(&napi->poll_list);
3737 quota = work + qlen;
3747 * __napi_schedule - schedule for receive
3748 * @n: entry to schedule
3750 * The entry's receive function will be scheduled to run
3752 void __napi_schedule(struct napi_struct *n)
3754 unsigned long flags;
3756 local_irq_save(flags);
3757 ____napi_schedule(&__get_cpu_var(softnet_data), n);
3758 local_irq_restore(flags);
3760 EXPORT_SYMBOL(__napi_schedule);
3762 void __napi_complete(struct napi_struct *n)
3764 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
3765 BUG_ON(n->gro_list);
3767 list_del(&n->poll_list);
3768 smp_mb__before_clear_bit();
3769 clear_bit(NAPI_STATE_SCHED, &n->state);
3771 EXPORT_SYMBOL(__napi_complete);
3773 void napi_complete(struct napi_struct *n)
3775 unsigned long flags;
3778 * don't let napi dequeue from the cpu poll list
3779 * just in case its running on a different cpu
3781 if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state)))
3785 local_irq_save(flags);
3787 local_irq_restore(flags);
3789 EXPORT_SYMBOL(napi_complete);
3791 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
3792 int (*poll)(struct napi_struct *, int), int weight)
3794 INIT_LIST_HEAD(&napi->poll_list);
3795 napi->gro_count = 0;
3796 napi->gro_list = NULL;
3799 napi->weight = weight;
3800 list_add(&napi->dev_list, &dev->napi_list);
3802 #ifdef CONFIG_NETPOLL
3803 spin_lock_init(&napi->poll_lock);
3804 napi->poll_owner = -1;
3806 set_bit(NAPI_STATE_SCHED, &napi->state);
3808 EXPORT_SYMBOL(netif_napi_add);
3810 void netif_napi_del(struct napi_struct *napi)
3812 struct sk_buff *skb, *next;
3814 list_del_init(&napi->dev_list);
3815 napi_free_frags(napi);
3817 for (skb = napi->gro_list; skb; skb = next) {
3823 napi->gro_list = NULL;
3824 napi->gro_count = 0;
3826 EXPORT_SYMBOL(netif_napi_del);
3828 static void net_rx_action(struct softirq_action *h)
3830 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3831 unsigned long time_limit = jiffies + 2;
3832 int budget = netdev_budget;
3835 local_irq_disable();
3837 while (!list_empty(&sd->poll_list)) {
3838 struct napi_struct *n;
3841 /* If softirq window is exhuasted then punt.
3842 * Allow this to run for 2 jiffies since which will allow
3843 * an average latency of 1.5/HZ.
3845 if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
3850 /* Even though interrupts have been re-enabled, this
3851 * access is safe because interrupts can only add new
3852 * entries to the tail of this list, and only ->poll()
3853 * calls can remove this head entry from the list.
3855 n = list_first_entry(&sd->poll_list, struct napi_struct, poll_list);
3857 have = netpoll_poll_lock(n);
3861 /* This NAPI_STATE_SCHED test is for avoiding a race
3862 * with netpoll's poll_napi(). Only the entity which
3863 * obtains the lock and sees NAPI_STATE_SCHED set will
3864 * actually make the ->poll() call. Therefore we avoid
3865 * accidentally calling ->poll() when NAPI is not scheduled.
3868 if (test_bit(NAPI_STATE_SCHED, &n->state)) {
3869 work = n->poll(n, weight);
3873 WARN_ON_ONCE(work > weight);
3877 local_irq_disable();
3879 /* Drivers must not modify the NAPI state if they
3880 * consume the entire weight. In such cases this code
3881 * still "owns" the NAPI instance and therefore can
3882 * move the instance around on the list at-will.
3884 if (unlikely(work == weight)) {
3885 if (unlikely(napi_disable_pending(n))) {
3888 local_irq_disable();
3890 list_move_tail(&n->poll_list, &sd->poll_list);
3893 netpoll_poll_unlock(have);
3896 net_rps_action_and_irq_enable(sd);
3898 #ifdef CONFIG_NET_DMA
3900 * There may not be any more sk_buffs coming right now, so push
3901 * any pending DMA copies to hardware
3903 dma_issue_pending_all();
3910 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3914 static gifconf_func_t *gifconf_list[NPROTO];
3917 * register_gifconf - register a SIOCGIF handler
3918 * @family: Address family
3919 * @gifconf: Function handler
3921 * Register protocol dependent address dumping routines. The handler
3922 * that is passed must not be freed or reused until it has been replaced
3923 * by another handler.
3925 int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
3927 if (family >= NPROTO)
3929 gifconf_list[family] = gifconf;
3932 EXPORT_SYMBOL(register_gifconf);
3936 * Map an interface index to its name (SIOCGIFNAME)
3940 * We need this ioctl for efficient implementation of the
3941 * if_indextoname() function required by the IPv6 API. Without
3942 * it, we would have to search all the interfaces to find a
3946 static int dev_ifname(struct net *net, struct ifreq __user *arg)
3948 struct net_device *dev;
3952 * Fetch the caller's info block.
3955 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
3959 dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex);
3965 strcpy(ifr.ifr_name, dev->name);
3968 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
3974 * Perform a SIOCGIFCONF call. This structure will change
3975 * size eventually, and there is nothing I can do about it.
3976 * Thus we will need a 'compatibility mode'.
3979 static int dev_ifconf(struct net *net, char __user *arg)
3982 struct net_device *dev;
3989 * Fetch the caller's info block.
3992 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
3999 * Loop over the interfaces, and write an info block for each.
4003 for_each_netdev(net, dev) {
4004 for (i = 0; i < NPROTO; i++) {
4005 if (gifconf_list[i]) {
4008 done = gifconf_list[i](dev, NULL, 0);
4010 done = gifconf_list[i](dev, pos + total,
4020 * All done. Write the updated control block back to the caller.
4022 ifc.ifc_len = total;
4025 * Both BSD and Solaris return 0 here, so we do too.
4027 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
4030 #ifdef CONFIG_PROC_FS
4032 #define BUCKET_SPACE (32 - NETDEV_HASHBITS)
4034 struct dev_iter_state {
4035 struct seq_net_private p;
4036 unsigned int pos; /* bucket << BUCKET_SPACE + offset */
4039 #define get_bucket(x) ((x) >> BUCKET_SPACE)
4040 #define get_offset(x) ((x) & ((1 << BUCKET_SPACE) - 1))
4041 #define set_bucket_offset(b, o) ((b) << BUCKET_SPACE | (o))
4043 static inline struct net_device *dev_from_same_bucket(struct seq_file *seq)
4045 struct dev_iter_state *state = seq->private;
4046 struct net *net = seq_file_net(seq);
4047 struct net_device *dev;
4048 struct hlist_node *p;
4049 struct hlist_head *h;
4050 unsigned int count, bucket, offset;
4052 bucket = get_bucket(state->pos);
4053 offset = get_offset(state->pos);
4054 h = &net->dev_name_head[bucket];
4056 hlist_for_each_entry_rcu(dev, p, h, name_hlist) {
4057 if (count++ == offset) {
4058 state->pos = set_bucket_offset(bucket, count);
4066 static inline struct net_device *dev_from_new_bucket(struct seq_file *seq)
4068 struct dev_iter_state *state = seq->private;
4069 struct net_device *dev;
4070 unsigned int bucket;
4072 bucket = get_bucket(state->pos);
4074 dev = dev_from_same_bucket(seq);
4079 state->pos = set_bucket_offset(bucket, 0);
4080 } while (bucket < NETDEV_HASHENTRIES);
4086 * This is invoked by the /proc filesystem handler to display a device
4089 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
4092 struct dev_iter_state *state = seq->private;
4096 return SEQ_START_TOKEN;
4098 /* check for end of the hash */
4099 if (state->pos == 0 && *pos > 1)
4102 return dev_from_new_bucket(seq);
4105 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4107 struct net_device *dev;
4111 if (v == SEQ_START_TOKEN)
4112 return dev_from_new_bucket(seq);
4114 dev = dev_from_same_bucket(seq);
4118 return dev_from_new_bucket(seq);
4121 void dev_seq_stop(struct seq_file *seq, void *v)
4127 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
4129 struct rtnl_link_stats64 temp;
4130 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
4132 seq_printf(seq, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu "
4133 "%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n",
4134 dev->name, stats->rx_bytes, stats->rx_packets,
4136 stats->rx_dropped + stats->rx_missed_errors,
4137 stats->rx_fifo_errors,
4138 stats->rx_length_errors + stats->rx_over_errors +
4139 stats->rx_crc_errors + stats->rx_frame_errors,
4140 stats->rx_compressed, stats->multicast,
4141 stats->tx_bytes, stats->tx_packets,
4142 stats->tx_errors, stats->tx_dropped,
4143 stats->tx_fifo_errors, stats->collisions,
4144 stats->tx_carrier_errors +
4145 stats->tx_aborted_errors +
4146 stats->tx_window_errors +
4147 stats->tx_heartbeat_errors,
4148 stats->tx_compressed);
4152 * Called from the PROCfs module. This now uses the new arbitrary sized
4153 * /proc/net interface to create /proc/net/dev
4155 static int dev_seq_show(struct seq_file *seq, void *v)
4157 if (v == SEQ_START_TOKEN)
4158 seq_puts(seq, "Inter-| Receive "
4160 " face |bytes packets errs drop fifo frame "
4161 "compressed multicast|bytes packets errs "
4162 "drop fifo colls carrier compressed\n");
4164 dev_seq_printf_stats(seq, v);
4168 static struct softnet_data *softnet_get_online(loff_t *pos)
4170 struct softnet_data *sd = NULL;
4172 while (*pos < nr_cpu_ids)
4173 if (cpu_online(*pos)) {
4174 sd = &per_cpu(softnet_data, *pos);
4181 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
4183 return softnet_get_online(pos);
4186 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4189 return softnet_get_online(pos);
4192 static void softnet_seq_stop(struct seq_file *seq, void *v)
4196 static int softnet_seq_show(struct seq_file *seq, void *v)
4198 struct softnet_data *sd = v;
4200 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
4201 sd->processed, sd->dropped, sd->time_squeeze, 0,
4202 0, 0, 0, 0, /* was fastroute */
4203 sd->cpu_collision, sd->received_rps);
4207 static const struct seq_operations dev_seq_ops = {
4208 .start = dev_seq_start,
4209 .next = dev_seq_next,
4210 .stop = dev_seq_stop,
4211 .show = dev_seq_show,
4214 static int dev_seq_open(struct inode *inode, struct file *file)
4216 return seq_open_net(inode, file, &dev_seq_ops,
4217 sizeof(struct dev_iter_state));
4220 int dev_seq_open_ops(struct inode *inode, struct file *file,
4221 const struct seq_operations *ops)
4223 return seq_open_net(inode, file, ops, sizeof(struct dev_iter_state));
4226 static const struct file_operations dev_seq_fops = {
4227 .owner = THIS_MODULE,
4228 .open = dev_seq_open,
4230 .llseek = seq_lseek,
4231 .release = seq_release_net,
4234 static const struct seq_operations softnet_seq_ops = {
4235 .start = softnet_seq_start,
4236 .next = softnet_seq_next,
4237 .stop = softnet_seq_stop,
4238 .show = softnet_seq_show,
4241 static int softnet_seq_open(struct inode *inode, struct file *file)
4243 return seq_open(file, &softnet_seq_ops);
4246 static const struct file_operations softnet_seq_fops = {
4247 .owner = THIS_MODULE,
4248 .open = softnet_seq_open,
4250 .llseek = seq_lseek,
4251 .release = seq_release,
4254 static void *ptype_get_idx(loff_t pos)
4256 struct packet_type *pt = NULL;
4260 list_for_each_entry_rcu(pt, &ptype_all, list) {
4266 for (t = 0; t < PTYPE_HASH_SIZE; t++) {
4267 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
4276 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
4280 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
4283 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4285 struct packet_type *pt;
4286 struct list_head *nxt;
4290 if (v == SEQ_START_TOKEN)
4291 return ptype_get_idx(0);
4294 nxt = pt->list.next;
4295 if (pt->type == htons(ETH_P_ALL)) {
4296 if (nxt != &ptype_all)
4299 nxt = ptype_base[0].next;
4301 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
4303 while (nxt == &ptype_base[hash]) {
4304 if (++hash >= PTYPE_HASH_SIZE)
4306 nxt = ptype_base[hash].next;
4309 return list_entry(nxt, struct packet_type, list);
4312 static void ptype_seq_stop(struct seq_file *seq, void *v)
4318 static int ptype_seq_show(struct seq_file *seq, void *v)
4320 struct packet_type *pt = v;
4322 if (v == SEQ_START_TOKEN)
4323 seq_puts(seq, "Type Device Function\n");
4324 else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
4325 if (pt->type == htons(ETH_P_ALL))
4326 seq_puts(seq, "ALL ");
4328 seq_printf(seq, "%04x", ntohs(pt->type));
4330 seq_printf(seq, " %-8s %pF\n",
4331 pt->dev ? pt->dev->name : "", pt->func);
4337 static const struct seq_operations ptype_seq_ops = {
4338 .start = ptype_seq_start,
4339 .next = ptype_seq_next,
4340 .stop = ptype_seq_stop,
4341 .show = ptype_seq_show,
4344 static int ptype_seq_open(struct inode *inode, struct file *file)
4346 return seq_open_net(inode, file, &ptype_seq_ops,
4347 sizeof(struct seq_net_private));
4350 static const struct file_operations ptype_seq_fops = {
4351 .owner = THIS_MODULE,
4352 .open = ptype_seq_open,
4354 .llseek = seq_lseek,
4355 .release = seq_release_net,
4359 static int __net_init dev_proc_net_init(struct net *net)
4363 if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
4365 if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
4367 if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
4370 if (wext_proc_init(net))
4376 proc_net_remove(net, "ptype");
4378 proc_net_remove(net, "softnet_stat");
4380 proc_net_remove(net, "dev");
4384 static void __net_exit dev_proc_net_exit(struct net *net)
4386 wext_proc_exit(net);
4388 proc_net_remove(net, "ptype");
4389 proc_net_remove(net, "softnet_stat");
4390 proc_net_remove(net, "dev");
4393 static struct pernet_operations __net_initdata dev_proc_ops = {
4394 .init = dev_proc_net_init,
4395 .exit = dev_proc_net_exit,
4398 static int __init dev_proc_init(void)
4400 return register_pernet_subsys(&dev_proc_ops);
4403 #define dev_proc_init() 0
4404 #endif /* CONFIG_PROC_FS */
4408 * netdev_set_master - set up master pointer
4409 * @slave: slave device
4410 * @master: new master device
4412 * Changes the master device of the slave. Pass %NULL to break the
4413 * bonding. The caller must hold the RTNL semaphore. On a failure
4414 * a negative errno code is returned. On success the reference counts
4415 * are adjusted and the function returns zero.
4417 int netdev_set_master(struct net_device *slave, struct net_device *master)
4419 struct net_device *old = slave->master;
4429 slave->master = master;
4435 EXPORT_SYMBOL(netdev_set_master);
4438 * netdev_set_bond_master - set up bonding master/slave pair
4439 * @slave: slave device
4440 * @master: new master device
4442 * Changes the master device of the slave. Pass %NULL to break the
4443 * bonding. The caller must hold the RTNL semaphore. On a failure
4444 * a negative errno code is returned. On success %RTM_NEWLINK is sent
4445 * to the routing socket and the function returns zero.
4447 int netdev_set_bond_master(struct net_device *slave, struct net_device *master)
4453 err = netdev_set_master(slave, master);
4457 slave->flags |= IFF_SLAVE;
4459 slave->flags &= ~IFF_SLAVE;
4461 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
4464 EXPORT_SYMBOL(netdev_set_bond_master);
4466 static void dev_change_rx_flags(struct net_device *dev, int flags)
4468 const struct net_device_ops *ops = dev->netdev_ops;
4470 if ((dev->flags & IFF_UP) && ops->ndo_change_rx_flags)
4471 ops->ndo_change_rx_flags(dev, flags);
4474 static int __dev_set_promiscuity(struct net_device *dev, int inc)
4476 unsigned int old_flags = dev->flags;
4482 dev->flags |= IFF_PROMISC;
4483 dev->promiscuity += inc;
4484 if (dev->promiscuity == 0) {
4487 * If inc causes overflow, untouch promisc and return error.
4490 dev->flags &= ~IFF_PROMISC;
4492 dev->promiscuity -= inc;
4493 printk(KERN_WARNING "%s: promiscuity touches roof, "
4494 "set promiscuity failed, promiscuity feature "
4495 "of device might be broken.\n", dev->name);
4499 if (dev->flags != old_flags) {
4500 printk(KERN_INFO "device %s %s promiscuous mode\n",
4501 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
4503 if (audit_enabled) {
4504 current_uid_gid(&uid, &gid);
4505 audit_log(current->audit_context, GFP_ATOMIC,
4506 AUDIT_ANOM_PROMISCUOUS,
4507 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
4508 dev->name, (dev->flags & IFF_PROMISC),
4509 (old_flags & IFF_PROMISC),
4510 audit_get_loginuid(current),
4512 audit_get_sessionid(current));
4515 dev_change_rx_flags(dev, IFF_PROMISC);
4521 * dev_set_promiscuity - update promiscuity count on a device
4525 * Add or remove promiscuity from a device. While the count in the device
4526 * remains above zero the interface remains promiscuous. Once it hits zero
4527 * the device reverts back to normal filtering operation. A negative inc
4528 * value is used to drop promiscuity on the device.
4529 * Return 0 if successful or a negative errno code on error.
4531 int dev_set_promiscuity(struct net_device *dev, int inc)
4533 unsigned int old_flags = dev->flags;
4536 err = __dev_set_promiscuity(dev, inc);
4539 if (dev->flags != old_flags)
4540 dev_set_rx_mode(dev);
4543 EXPORT_SYMBOL(dev_set_promiscuity);
4546 * dev_set_allmulti - update allmulti count on a device
4550 * Add or remove reception of all multicast frames to a device. While the
4551 * count in the device remains above zero the interface remains listening
4552 * to all interfaces. Once it hits zero the device reverts back to normal
4553 * filtering operation. A negative @inc value is used to drop the counter
4554 * when releasing a resource needing all multicasts.
4555 * Return 0 if successful or a negative errno code on error.
4558 int dev_set_allmulti(struct net_device *dev, int inc)
4560 unsigned int old_flags = dev->flags;
4564 dev->flags |= IFF_ALLMULTI;
4565 dev->allmulti += inc;
4566 if (dev->allmulti == 0) {
4569 * If inc causes overflow, untouch allmulti and return error.
4572 dev->flags &= ~IFF_ALLMULTI;
4574 dev->allmulti -= inc;
4575 printk(KERN_WARNING "%s: allmulti touches roof, "
4576 "set allmulti failed, allmulti feature of "
4577 "device might be broken.\n", dev->name);
4581 if (dev->flags ^ old_flags) {
4582 dev_change_rx_flags(dev, IFF_ALLMULTI);
4583 dev_set_rx_mode(dev);
4587 EXPORT_SYMBOL(dev_set_allmulti);
4590 * Upload unicast and multicast address lists to device and
4591 * configure RX filtering. When the device doesn't support unicast
4592 * filtering it is put in promiscuous mode while unicast addresses
4595 void __dev_set_rx_mode(struct net_device *dev)
4597 const struct net_device_ops *ops = dev->netdev_ops;
4599 /* dev_open will call this function so the list will stay sane. */
4600 if (!(dev->flags&IFF_UP))
4603 if (!netif_device_present(dev))
4606 if (!(dev->priv_flags & IFF_UNICAST_FLT)) {
4607 /* Unicast addresses changes may only happen under the rtnl,
4608 * therefore calling __dev_set_promiscuity here is safe.
4610 if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
4611 __dev_set_promiscuity(dev, 1);
4612 dev->uc_promisc = true;
4613 } else if (netdev_uc_empty(dev) && dev->uc_promisc) {
4614 __dev_set_promiscuity(dev, -1);
4615 dev->uc_promisc = false;
4619 if (ops->ndo_set_rx_mode)
4620 ops->ndo_set_rx_mode(dev);
4623 void dev_set_rx_mode(struct net_device *dev)
4625 netif_addr_lock_bh(dev);
4626 __dev_set_rx_mode(dev);
4627 netif_addr_unlock_bh(dev);
4631 * dev_get_flags - get flags reported to userspace
4634 * Get the combination of flag bits exported through APIs to userspace.
4636 unsigned dev_get_flags(const struct net_device *dev)
4640 flags = (dev->flags & ~(IFF_PROMISC |
4645 (dev->gflags & (IFF_PROMISC |
4648 if (netif_running(dev)) {
4649 if (netif_oper_up(dev))
4650 flags |= IFF_RUNNING;
4651 if (netif_carrier_ok(dev))
4652 flags |= IFF_LOWER_UP;
4653 if (netif_dormant(dev))
4654 flags |= IFF_DORMANT;
4659 EXPORT_SYMBOL(dev_get_flags);
4661 int __dev_change_flags(struct net_device *dev, unsigned int flags)
4663 unsigned int old_flags = dev->flags;
4669 * Set the flags on our device.
4672 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
4673 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
4675 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
4679 * Load in the correct multicast list now the flags have changed.
4682 if ((old_flags ^ flags) & IFF_MULTICAST)
4683 dev_change_rx_flags(dev, IFF_MULTICAST);
4685 dev_set_rx_mode(dev);
4688 * Have we downed the interface. We handle IFF_UP ourselves
4689 * according to user attempts to set it, rather than blindly
4694 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
4695 ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev);
4698 dev_set_rx_mode(dev);
4701 if ((flags ^ dev->gflags) & IFF_PROMISC) {
4702 int inc = (flags & IFF_PROMISC) ? 1 : -1;
4704 dev->gflags ^= IFF_PROMISC;
4705 dev_set_promiscuity(dev, inc);
4708 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
4709 is important. Some (broken) drivers set IFF_PROMISC, when
4710 IFF_ALLMULTI is requested not asking us and not reporting.
4712 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
4713 int inc = (flags & IFF_ALLMULTI) ? 1 : -1;
4715 dev->gflags ^= IFF_ALLMULTI;
4716 dev_set_allmulti(dev, inc);
4722 void __dev_notify_flags(struct net_device *dev, unsigned int old_flags)
4724 unsigned int changes = dev->flags ^ old_flags;
4726 if (changes & IFF_UP) {
4727 if (dev->flags & IFF_UP)
4728 call_netdevice_notifiers(NETDEV_UP, dev);
4730 call_netdevice_notifiers(NETDEV_DOWN, dev);
4733 if (dev->flags & IFF_UP &&
4734 (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE)))
4735 call_netdevice_notifiers(NETDEV_CHANGE, dev);
4739 * dev_change_flags - change device settings
4741 * @flags: device state flags
4743 * Change settings on device based state flags. The flags are
4744 * in the userspace exported format.
4746 int dev_change_flags(struct net_device *dev, unsigned int flags)
4749 unsigned int changes, old_flags = dev->flags;
4751 ret = __dev_change_flags(dev, flags);
4755 changes = old_flags ^ dev->flags;
4757 rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
4759 __dev_notify_flags(dev, old_flags);
4762 EXPORT_SYMBOL(dev_change_flags);
4765 * dev_set_mtu - Change maximum transfer unit
4767 * @new_mtu: new transfer unit
4769 * Change the maximum transfer size of the network device.
4771 int dev_set_mtu(struct net_device *dev, int new_mtu)
4773 const struct net_device_ops *ops = dev->netdev_ops;
4776 if (new_mtu == dev->mtu)
4779 /* MTU must be positive. */
4783 if (!netif_device_present(dev))
4787 if (ops->ndo_change_mtu)
4788 err = ops->ndo_change_mtu(dev, new_mtu);
4792 if (!err && dev->flags & IFF_UP)
4793 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
4796 EXPORT_SYMBOL(dev_set_mtu);
4799 * dev_set_group - Change group this device belongs to
4801 * @new_group: group this device should belong to
4803 void dev_set_group(struct net_device *dev, int new_group)
4805 dev->group = new_group;
4807 EXPORT_SYMBOL(dev_set_group);
4810 * dev_set_mac_address - Change Media Access Control Address
4814 * Change the hardware (MAC) address of the device
4816 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
4818 const struct net_device_ops *ops = dev->netdev_ops;
4821 if (!ops->ndo_set_mac_address)
4823 if (sa->sa_family != dev->type)
4825 if (!netif_device_present(dev))
4827 err = ops->ndo_set_mac_address(dev, sa);
4829 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4832 EXPORT_SYMBOL(dev_set_mac_address);
4835 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
4837 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
4840 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
4846 case SIOCGIFFLAGS: /* Get interface flags */
4847 ifr->ifr_flags = (short) dev_get_flags(dev);
4850 case SIOCGIFMETRIC: /* Get the metric on the interface
4851 (currently unused) */
4852 ifr->ifr_metric = 0;
4855 case SIOCGIFMTU: /* Get the MTU of a device */
4856 ifr->ifr_mtu = dev->mtu;
4861 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
4863 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
4864 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4865 ifr->ifr_hwaddr.sa_family = dev->type;
4873 ifr->ifr_map.mem_start = dev->mem_start;
4874 ifr->ifr_map.mem_end = dev->mem_end;
4875 ifr->ifr_map.base_addr = dev->base_addr;
4876 ifr->ifr_map.irq = dev->irq;
4877 ifr->ifr_map.dma = dev->dma;
4878 ifr->ifr_map.port = dev->if_port;
4882 ifr->ifr_ifindex = dev->ifindex;
4886 ifr->ifr_qlen = dev->tx_queue_len;
4890 /* dev_ioctl() should ensure this case
4902 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
4904 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
4907 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
4908 const struct net_device_ops *ops;
4913 ops = dev->netdev_ops;
4916 case SIOCSIFFLAGS: /* Set interface flags */
4917 return dev_change_flags(dev, ifr->ifr_flags);
4919 case SIOCSIFMETRIC: /* Set the metric on the interface
4920 (currently unused) */
4923 case SIOCSIFMTU: /* Set the MTU of a device */
4924 return dev_set_mtu(dev, ifr->ifr_mtu);
4927 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
4929 case SIOCSIFHWBROADCAST:
4930 if (ifr->ifr_hwaddr.sa_family != dev->type)
4932 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
4933 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4934 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4938 if (ops->ndo_set_config) {
4939 if (!netif_device_present(dev))
4941 return ops->ndo_set_config(dev, &ifr->ifr_map);
4946 if (!ops->ndo_set_rx_mode ||
4947 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4949 if (!netif_device_present(dev))
4951 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
4954 if (!ops->ndo_set_rx_mode ||
4955 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4957 if (!netif_device_present(dev))
4959 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
4962 if (ifr->ifr_qlen < 0)
4964 dev->tx_queue_len = ifr->ifr_qlen;
4968 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
4969 return dev_change_name(dev, ifr->ifr_newname);
4972 err = net_hwtstamp_validate(ifr);
4978 * Unknown or private ioctl
4981 if ((cmd >= SIOCDEVPRIVATE &&
4982 cmd <= SIOCDEVPRIVATE + 15) ||
4983 cmd == SIOCBONDENSLAVE ||
4984 cmd == SIOCBONDRELEASE ||
4985 cmd == SIOCBONDSETHWADDR ||
4986 cmd == SIOCBONDSLAVEINFOQUERY ||
4987 cmd == SIOCBONDINFOQUERY ||
4988 cmd == SIOCBONDCHANGEACTIVE ||
4989 cmd == SIOCGMIIPHY ||
4990 cmd == SIOCGMIIREG ||
4991 cmd == SIOCSMIIREG ||
4992 cmd == SIOCBRADDIF ||
4993 cmd == SIOCBRDELIF ||
4994 cmd == SIOCSHWTSTAMP ||
4995 cmd == SIOCWANDEV) {
4997 if (ops->ndo_do_ioctl) {
4998 if (netif_device_present(dev))
4999 err = ops->ndo_do_ioctl(dev, ifr, cmd);
5011 * This function handles all "interface"-type I/O control requests. The actual
5012 * 'doing' part of this is dev_ifsioc above.
5016 * dev_ioctl - network device ioctl
5017 * @net: the applicable net namespace
5018 * @cmd: command to issue
5019 * @arg: pointer to a struct ifreq in user space
5021 * Issue ioctl functions to devices. This is normally called by the
5022 * user space syscall interfaces but can sometimes be useful for
5023 * other purposes. The return value is the return from the syscall if
5024 * positive or a negative errno code on error.
5027 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
5033 /* One special case: SIOCGIFCONF takes ifconf argument
5034 and requires shared lock, because it sleeps writing
5038 if (cmd == SIOCGIFCONF) {
5040 ret = dev_ifconf(net, (char __user *) arg);
5044 if (cmd == SIOCGIFNAME)
5045 return dev_ifname(net, (struct ifreq __user *)arg);
5047 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
5050 ifr.ifr_name[IFNAMSIZ-1] = 0;
5052 colon = strchr(ifr.ifr_name, ':');
5057 * See which interface the caller is talking about.
5062 * These ioctl calls:
5063 * - can be done by all.
5064 * - atomic and do not require locking.
5075 dev_load(net, ifr.ifr_name);
5077 ret = dev_ifsioc_locked(net, &ifr, cmd);
5082 if (copy_to_user(arg, &ifr,
5083 sizeof(struct ifreq)))
5089 dev_load(net, ifr.ifr_name);
5091 ret = dev_ethtool(net, &ifr);
5096 if (copy_to_user(arg, &ifr,
5097 sizeof(struct ifreq)))
5103 * These ioctl calls:
5104 * - require superuser power.
5105 * - require strict serialization.
5111 if (!capable(CAP_NET_ADMIN))
5113 dev_load(net, ifr.ifr_name);
5115 ret = dev_ifsioc(net, &ifr, cmd);
5120 if (copy_to_user(arg, &ifr,
5121 sizeof(struct ifreq)))
5127 * These ioctl calls:
5128 * - require superuser power.
5129 * - require strict serialization.
5130 * - do not return a value
5140 case SIOCSIFHWBROADCAST:
5143 case SIOCBONDENSLAVE:
5144 case SIOCBONDRELEASE:
5145 case SIOCBONDSETHWADDR:
5146 case SIOCBONDCHANGEACTIVE:
5150 if (!capable(CAP_NET_ADMIN))
5153 case SIOCBONDSLAVEINFOQUERY:
5154 case SIOCBONDINFOQUERY:
5155 dev_load(net, ifr.ifr_name);
5157 ret = dev_ifsioc(net, &ifr, cmd);
5162 /* Get the per device memory space. We can add this but
5163 * currently do not support it */
5165 /* Set the per device memory buffer space.
5166 * Not applicable in our case */
5171 * Unknown or private ioctl.
5174 if (cmd == SIOCWANDEV ||
5175 (cmd >= SIOCDEVPRIVATE &&
5176 cmd <= SIOCDEVPRIVATE + 15)) {
5177 dev_load(net, ifr.ifr_name);
5179 ret = dev_ifsioc(net, &ifr, cmd);
5181 if (!ret && copy_to_user(arg, &ifr,
5182 sizeof(struct ifreq)))
5186 /* Take care of Wireless Extensions */
5187 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
5188 return wext_handle_ioctl(net, &ifr, cmd, arg);
5195 * dev_new_index - allocate an ifindex
5196 * @net: the applicable net namespace
5198 * Returns a suitable unique value for a new device interface
5199 * number. The caller must hold the rtnl semaphore or the
5200 * dev_base_lock to be sure it remains unique.
5202 static int dev_new_index(struct net *net)
5208 if (!__dev_get_by_index(net, ifindex))
5213 /* Delayed registration/unregisteration */
5214 static LIST_HEAD(net_todo_list);
5216 static void net_set_todo(struct net_device *dev)
5218 list_add_tail(&dev->todo_list, &net_todo_list);
5221 static void rollback_registered_many(struct list_head *head)
5223 struct net_device *dev, *tmp;
5225 BUG_ON(dev_boot_phase);
5228 list_for_each_entry_safe(dev, tmp, head, unreg_list) {
5229 /* Some devices call without registering
5230 * for initialization unwind. Remove those
5231 * devices and proceed with the remaining.
5233 if (dev->reg_state == NETREG_UNINITIALIZED) {
5234 pr_debug("unregister_netdevice: device %s/%p never "
5235 "was registered\n", dev->name, dev);
5238 list_del(&dev->unreg_list);
5241 dev->dismantle = true;
5242 BUG_ON(dev->reg_state != NETREG_REGISTERED);
5245 /* If device is running, close it first. */
5246 dev_close_many(head);
5248 list_for_each_entry(dev, head, unreg_list) {
5249 /* And unlink it from device chain. */
5250 unlist_netdevice(dev);
5252 dev->reg_state = NETREG_UNREGISTERING;
5257 list_for_each_entry(dev, head, unreg_list) {
5258 /* Shutdown queueing discipline. */
5262 /* Notify protocols, that we are about to destroy
5263 this device. They should clean all the things.
5265 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5267 if (!dev->rtnl_link_ops ||
5268 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
5269 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
5272 * Flush the unicast and multicast chains
5277 if (dev->netdev_ops->ndo_uninit)
5278 dev->netdev_ops->ndo_uninit(dev);
5280 /* Notifier chain MUST detach us from master device. */
5281 WARN_ON(dev->master);
5283 /* Remove entries from kobject tree */
5284 netdev_unregister_kobject(dev);
5287 /* Process any work delayed until the end of the batch */
5288 dev = list_first_entry(head, struct net_device, unreg_list);
5289 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
5293 list_for_each_entry(dev, head, unreg_list)
5297 static void rollback_registered(struct net_device *dev)
5301 list_add(&dev->unreg_list, &single);
5302 rollback_registered_many(&single);
5306 static netdev_features_t netdev_fix_features(struct net_device *dev,
5307 netdev_features_t features)
5309 /* Fix illegal checksum combinations */
5310 if ((features & NETIF_F_HW_CSUM) &&
5311 (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5312 netdev_warn(dev, "mixed HW and IP checksum settings.\n");
5313 features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
5316 /* Fix illegal SG+CSUM combinations. */
5317 if ((features & NETIF_F_SG) &&
5318 !(features & NETIF_F_ALL_CSUM)) {
5320 "Dropping NETIF_F_SG since no checksum feature.\n");
5321 features &= ~NETIF_F_SG;
5324 /* TSO requires that SG is present as well. */
5325 if ((features & NETIF_F_ALL_TSO) && !(features & NETIF_F_SG)) {
5326 netdev_dbg(dev, "Dropping TSO features since no SG feature.\n");
5327 features &= ~NETIF_F_ALL_TSO;
5330 /* TSO ECN requires that TSO is present as well. */
5331 if ((features & NETIF_F_ALL_TSO) == NETIF_F_TSO_ECN)
5332 features &= ~NETIF_F_TSO_ECN;
5334 /* Software GSO depends on SG. */
5335 if ((features & NETIF_F_GSO) && !(features & NETIF_F_SG)) {
5336 netdev_dbg(dev, "Dropping NETIF_F_GSO since no SG feature.\n");
5337 features &= ~NETIF_F_GSO;
5340 /* UFO needs SG and checksumming */
5341 if (features & NETIF_F_UFO) {
5342 /* maybe split UFO into V4 and V6? */
5343 if (!((features & NETIF_F_GEN_CSUM) ||
5344 (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))
5345 == (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5347 "Dropping NETIF_F_UFO since no checksum offload features.\n");
5348 features &= ~NETIF_F_UFO;
5351 if (!(features & NETIF_F_SG)) {
5353 "Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n");
5354 features &= ~NETIF_F_UFO;
5361 int __netdev_update_features(struct net_device *dev)
5363 netdev_features_t features;
5368 features = netdev_get_wanted_features(dev);
5370 if (dev->netdev_ops->ndo_fix_features)
5371 features = dev->netdev_ops->ndo_fix_features(dev, features);
5373 /* driver might be less strict about feature dependencies */
5374 features = netdev_fix_features(dev, features);
5376 if (dev->features == features)
5379 netdev_dbg(dev, "Features changed: %pNF -> %pNF\n",
5380 &dev->features, &features);
5382 if (dev->netdev_ops->ndo_set_features)
5383 err = dev->netdev_ops->ndo_set_features(dev, features);
5385 if (unlikely(err < 0)) {
5387 "set_features() failed (%d); wanted %pNF, left %pNF\n",
5388 err, &features, &dev->features);
5393 dev->features = features;
5399 * netdev_update_features - recalculate device features
5400 * @dev: the device to check
5402 * Recalculate dev->features set and send notifications if it
5403 * has changed. Should be called after driver or hardware dependent
5404 * conditions might have changed that influence the features.
5406 void netdev_update_features(struct net_device *dev)
5408 if (__netdev_update_features(dev))
5409 netdev_features_change(dev);
5411 EXPORT_SYMBOL(netdev_update_features);
5414 * netdev_change_features - recalculate device features
5415 * @dev: the device to check
5417 * Recalculate dev->features set and send notifications even
5418 * if they have not changed. Should be called instead of
5419 * netdev_update_features() if also dev->vlan_features might
5420 * have changed to allow the changes to be propagated to stacked
5423 void netdev_change_features(struct net_device *dev)
5425 __netdev_update_features(dev);
5426 netdev_features_change(dev);
5428 EXPORT_SYMBOL(netdev_change_features);
5431 * netif_stacked_transfer_operstate - transfer operstate
5432 * @rootdev: the root or lower level device to transfer state from
5433 * @dev: the device to transfer operstate to
5435 * Transfer operational state from root to device. This is normally
5436 * called when a stacking relationship exists between the root
5437 * device and the device(a leaf device).
5439 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
5440 struct net_device *dev)
5442 if (rootdev->operstate == IF_OPER_DORMANT)
5443 netif_dormant_on(dev);
5445 netif_dormant_off(dev);
5447 if (netif_carrier_ok(rootdev)) {
5448 if (!netif_carrier_ok(dev))
5449 netif_carrier_on(dev);
5451 if (netif_carrier_ok(dev))
5452 netif_carrier_off(dev);
5455 EXPORT_SYMBOL(netif_stacked_transfer_operstate);
5458 static int netif_alloc_rx_queues(struct net_device *dev)
5460 unsigned int i, count = dev->num_rx_queues;
5461 struct netdev_rx_queue *rx;
5465 rx = kcalloc(count, sizeof(struct netdev_rx_queue), GFP_KERNEL);
5467 pr_err("netdev: Unable to allocate %u rx queues.\n", count);
5472 for (i = 0; i < count; i++)
5478 static void netdev_init_one_queue(struct net_device *dev,
5479 struct netdev_queue *queue, void *_unused)
5481 /* Initialize queue lock */
5482 spin_lock_init(&queue->_xmit_lock);
5483 netdev_set_xmit_lockdep_class(&queue->_xmit_lock, dev->type);
5484 queue->xmit_lock_owner = -1;
5485 netdev_queue_numa_node_write(queue, NUMA_NO_NODE);
5488 dql_init(&queue->dql, HZ);
5492 static int netif_alloc_netdev_queues(struct net_device *dev)
5494 unsigned int count = dev->num_tx_queues;
5495 struct netdev_queue *tx;
5499 tx = kcalloc(count, sizeof(struct netdev_queue), GFP_KERNEL);
5501 pr_err("netdev: Unable to allocate %u tx queues.\n",
5507 netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
5508 spin_lock_init(&dev->tx_global_lock);
5514 * register_netdevice - register a network device
5515 * @dev: device to register
5517 * Take a completed network device structure and add it to the kernel
5518 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5519 * chain. 0 is returned on success. A negative errno code is returned
5520 * on a failure to set up the device, or if the name is a duplicate.
5522 * Callers must hold the rtnl semaphore. You may want
5523 * register_netdev() instead of this.
5526 * The locking appears insufficient to guarantee two parallel registers
5527 * will not get the same name.
5530 int register_netdevice(struct net_device *dev)
5533 struct net *net = dev_net(dev);
5535 BUG_ON(dev_boot_phase);
5540 /* When net_device's are persistent, this will be fatal. */
5541 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
5544 spin_lock_init(&dev->addr_list_lock);
5545 netdev_set_addr_lockdep_class(dev);
5549 ret = dev_get_valid_name(dev, dev->name);
5553 /* Init, if this function is available */
5554 if (dev->netdev_ops->ndo_init) {
5555 ret = dev->netdev_ops->ndo_init(dev);
5563 dev->ifindex = dev_new_index(net);
5564 if (dev->iflink == -1)
5565 dev->iflink = dev->ifindex;
5567 /* Transfer changeable features to wanted_features and enable
5568 * software offloads (GSO and GRO).
5570 dev->hw_features |= NETIF_F_SOFT_FEATURES;
5571 dev->features |= NETIF_F_SOFT_FEATURES;
5572 dev->wanted_features = dev->features & dev->hw_features;
5574 /* Turn on no cache copy if HW is doing checksum */
5575 if (!(dev->flags & IFF_LOOPBACK)) {
5576 dev->hw_features |= NETIF_F_NOCACHE_COPY;
5577 if (dev->features & NETIF_F_ALL_CSUM) {
5578 dev->wanted_features |= NETIF_F_NOCACHE_COPY;
5579 dev->features |= NETIF_F_NOCACHE_COPY;
5583 /* Make NETIF_F_HIGHDMA inheritable to VLAN devices.
5585 dev->vlan_features |= NETIF_F_HIGHDMA;
5587 ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
5588 ret = notifier_to_errno(ret);
5592 ret = netdev_register_kobject(dev);
5595 dev->reg_state = NETREG_REGISTERED;
5597 __netdev_update_features(dev);
5600 * Default initial state at registry is that the
5601 * device is present.
5604 set_bit(__LINK_STATE_PRESENT, &dev->state);
5606 dev_init_scheduler(dev);
5608 list_netdevice(dev);
5610 /* Notify protocols, that a new device appeared. */
5611 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
5612 ret = notifier_to_errno(ret);
5614 rollback_registered(dev);
5615 dev->reg_state = NETREG_UNREGISTERED;
5618 * Prevent userspace races by waiting until the network
5619 * device is fully setup before sending notifications.
5621 if (!dev->rtnl_link_ops ||
5622 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
5623 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
5629 if (dev->netdev_ops->ndo_uninit)
5630 dev->netdev_ops->ndo_uninit(dev);
5633 EXPORT_SYMBOL(register_netdevice);
5636 * init_dummy_netdev - init a dummy network device for NAPI
5637 * @dev: device to init
5639 * This takes a network device structure and initialize the minimum
5640 * amount of fields so it can be used to schedule NAPI polls without
5641 * registering a full blown interface. This is to be used by drivers
5642 * that need to tie several hardware interfaces to a single NAPI
5643 * poll scheduler due to HW limitations.
5645 int init_dummy_netdev(struct net_device *dev)
5647 /* Clear everything. Note we don't initialize spinlocks
5648 * are they aren't supposed to be taken by any of the
5649 * NAPI code and this dummy netdev is supposed to be
5650 * only ever used for NAPI polls
5652 memset(dev, 0, sizeof(struct net_device));
5654 /* make sure we BUG if trying to hit standard
5655 * register/unregister code path
5657 dev->reg_state = NETREG_DUMMY;
5659 /* NAPI wants this */
5660 INIT_LIST_HEAD(&dev->napi_list);
5662 /* a dummy interface is started by default */
5663 set_bit(__LINK_STATE_PRESENT, &dev->state);
5664 set_bit(__LINK_STATE_START, &dev->state);
5666 /* Note : We dont allocate pcpu_refcnt for dummy devices,
5667 * because users of this 'device' dont need to change
5673 EXPORT_SYMBOL_GPL(init_dummy_netdev);
5677 * register_netdev - register a network device
5678 * @dev: device to register
5680 * Take a completed network device structure and add it to the kernel
5681 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5682 * chain. 0 is returned on success. A negative errno code is returned
5683 * on a failure to set up the device, or if the name is a duplicate.
5685 * This is a wrapper around register_netdevice that takes the rtnl semaphore
5686 * and expands the device name if you passed a format string to
5689 int register_netdev(struct net_device *dev)
5694 err = register_netdevice(dev);
5698 EXPORT_SYMBOL(register_netdev);
5700 int netdev_refcnt_read(const struct net_device *dev)
5704 for_each_possible_cpu(i)
5705 refcnt += *per_cpu_ptr(dev->pcpu_refcnt, i);
5708 EXPORT_SYMBOL(netdev_refcnt_read);
5711 * netdev_wait_allrefs - wait until all references are gone.
5713 * This is called when unregistering network devices.
5715 * Any protocol or device that holds a reference should register
5716 * for netdevice notification, and cleanup and put back the
5717 * reference if they receive an UNREGISTER event.
5718 * We can get stuck here if buggy protocols don't correctly
5721 static void netdev_wait_allrefs(struct net_device *dev)
5723 unsigned long rebroadcast_time, warning_time;
5726 linkwatch_forget_dev(dev);
5728 rebroadcast_time = warning_time = jiffies;
5729 refcnt = netdev_refcnt_read(dev);
5731 while (refcnt != 0) {
5732 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
5735 /* Rebroadcast unregister notification */
5736 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5737 /* don't resend NETDEV_UNREGISTER_BATCH, _BATCH users
5738 * should have already handle it the first time */
5740 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
5742 /* We must not have linkwatch events
5743 * pending on unregister. If this
5744 * happens, we simply run the queue
5745 * unscheduled, resulting in a noop
5748 linkwatch_run_queue();
5753 rebroadcast_time = jiffies;
5758 refcnt = netdev_refcnt_read(dev);
5760 if (time_after(jiffies, warning_time + 10 * HZ)) {
5761 printk(KERN_EMERG "unregister_netdevice: "
5762 "waiting for %s to become free. Usage "
5765 warning_time = jiffies;
5774 * register_netdevice(x1);
5775 * register_netdevice(x2);
5777 * unregister_netdevice(y1);
5778 * unregister_netdevice(y2);
5784 * We are invoked by rtnl_unlock().
5785 * This allows us to deal with problems:
5786 * 1) We can delete sysfs objects which invoke hotplug
5787 * without deadlocking with linkwatch via keventd.
5788 * 2) Since we run with the RTNL semaphore not held, we can sleep
5789 * safely in order to wait for the netdev refcnt to drop to zero.
5791 * We must not return until all unregister events added during
5792 * the interval the lock was held have been completed.
5794 void netdev_run_todo(void)
5796 struct list_head list;
5798 /* Snapshot list, allow later requests */
5799 list_replace_init(&net_todo_list, &list);
5803 /* Wait for rcu callbacks to finish before attempting to drain
5804 * the device list. This usually avoids a 250ms wait.
5806 if (!list_empty(&list))
5809 while (!list_empty(&list)) {
5810 struct net_device *dev
5811 = list_first_entry(&list, struct net_device, todo_list);
5812 list_del(&dev->todo_list);
5814 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
5815 printk(KERN_ERR "network todo '%s' but state %d\n",
5816 dev->name, dev->reg_state);
5821 dev->reg_state = NETREG_UNREGISTERED;
5823 on_each_cpu(flush_backlog, dev, 1);
5825 netdev_wait_allrefs(dev);
5828 BUG_ON(netdev_refcnt_read(dev));
5829 WARN_ON(rcu_access_pointer(dev->ip_ptr));
5830 WARN_ON(rcu_access_pointer(dev->ip6_ptr));
5831 WARN_ON(dev->dn_ptr);
5833 if (dev->destructor)
5834 dev->destructor(dev);
5836 /* Free network device */
5837 kobject_put(&dev->dev.kobj);
5841 /* Convert net_device_stats to rtnl_link_stats64. They have the same
5842 * fields in the same order, with only the type differing.
5844 static void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
5845 const struct net_device_stats *netdev_stats)
5847 #if BITS_PER_LONG == 64
5848 BUILD_BUG_ON(sizeof(*stats64) != sizeof(*netdev_stats));
5849 memcpy(stats64, netdev_stats, sizeof(*stats64));
5851 size_t i, n = sizeof(*stats64) / sizeof(u64);
5852 const unsigned long *src = (const unsigned long *)netdev_stats;
5853 u64 *dst = (u64 *)stats64;
5855 BUILD_BUG_ON(sizeof(*netdev_stats) / sizeof(unsigned long) !=
5856 sizeof(*stats64) / sizeof(u64));
5857 for (i = 0; i < n; i++)
5863 * dev_get_stats - get network device statistics
5864 * @dev: device to get statistics from
5865 * @storage: place to store stats
5867 * Get network statistics from device. Return @storage.
5868 * The device driver may provide its own method by setting
5869 * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
5870 * otherwise the internal statistics structure is used.
5872 struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
5873 struct rtnl_link_stats64 *storage)
5875 const struct net_device_ops *ops = dev->netdev_ops;
5877 if (ops->ndo_get_stats64) {
5878 memset(storage, 0, sizeof(*storage));
5879 ops->ndo_get_stats64(dev, storage);
5880 } else if (ops->ndo_get_stats) {
5881 netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev));
5883 netdev_stats_to_stats64(storage, &dev->stats);
5885 storage->rx_dropped += atomic_long_read(&dev->rx_dropped);
5888 EXPORT_SYMBOL(dev_get_stats);
5890 struct netdev_queue *dev_ingress_queue_create(struct net_device *dev)
5892 struct netdev_queue *queue = dev_ingress_queue(dev);
5894 #ifdef CONFIG_NET_CLS_ACT
5897 queue = kzalloc(sizeof(*queue), GFP_KERNEL);
5900 netdev_init_one_queue(dev, queue, NULL);
5901 queue->qdisc = &noop_qdisc;
5902 queue->qdisc_sleeping = &noop_qdisc;
5903 rcu_assign_pointer(dev->ingress_queue, queue);
5909 * alloc_netdev_mqs - allocate network device
5910 * @sizeof_priv: size of private data to allocate space for
5911 * @name: device name format string
5912 * @setup: callback to initialize device
5913 * @txqs: the number of TX subqueues to allocate
5914 * @rxqs: the number of RX subqueues to allocate
5916 * Allocates a struct net_device with private data area for driver use
5917 * and performs basic initialization. Also allocates subquue structs
5918 * for each queue on the device.
5920 struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
5921 void (*setup)(struct net_device *),
5922 unsigned int txqs, unsigned int rxqs)
5924 struct net_device *dev;
5926 struct net_device *p;
5928 BUG_ON(strlen(name) >= sizeof(dev->name));
5931 pr_err("alloc_netdev: Unable to allocate device "
5932 "with zero queues.\n");
5938 pr_err("alloc_netdev: Unable to allocate device "
5939 "with zero RX queues.\n");
5944 alloc_size = sizeof(struct net_device);
5946 /* ensure 32-byte alignment of private area */
5947 alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
5948 alloc_size += sizeof_priv;
5950 /* ensure 32-byte alignment of whole construct */
5951 alloc_size += NETDEV_ALIGN - 1;
5953 p = kzalloc(alloc_size, GFP_KERNEL);
5955 printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
5959 dev = PTR_ALIGN(p, NETDEV_ALIGN);
5960 dev->padded = (char *)dev - (char *)p;
5962 dev->pcpu_refcnt = alloc_percpu(int);
5963 if (!dev->pcpu_refcnt)
5966 if (dev_addr_init(dev))
5972 dev_net_set(dev, &init_net);
5974 dev->gso_max_size = GSO_MAX_SIZE;
5976 INIT_LIST_HEAD(&dev->napi_list);
5977 INIT_LIST_HEAD(&dev->unreg_list);
5978 INIT_LIST_HEAD(&dev->link_watch_list);
5979 dev->priv_flags = IFF_XMIT_DST_RELEASE;
5982 dev->num_tx_queues = txqs;
5983 dev->real_num_tx_queues = txqs;
5984 if (netif_alloc_netdev_queues(dev))
5988 dev->num_rx_queues = rxqs;
5989 dev->real_num_rx_queues = rxqs;
5990 if (netif_alloc_rx_queues(dev))
5994 strcpy(dev->name, name);
5995 dev->group = INIT_NETDEV_GROUP;
6003 free_percpu(dev->pcpu_refcnt);
6013 EXPORT_SYMBOL(alloc_netdev_mqs);
6016 * free_netdev - free network device
6019 * This function does the last stage of destroying an allocated device
6020 * interface. The reference to the device object is released.
6021 * If this is the last reference then it will be freed.
6023 void free_netdev(struct net_device *dev)
6025 struct napi_struct *p, *n;
6027 release_net(dev_net(dev));
6034 kfree(rcu_dereference_protected(dev->ingress_queue, 1));
6036 /* Flush device addresses */
6037 dev_addr_flush(dev);
6039 list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
6042 free_percpu(dev->pcpu_refcnt);
6043 dev->pcpu_refcnt = NULL;
6045 /* Compatibility with error handling in drivers */
6046 if (dev->reg_state == NETREG_UNINITIALIZED) {
6047 kfree((char *)dev - dev->padded);
6051 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
6052 dev->reg_state = NETREG_RELEASED;
6054 /* will free via device release */
6055 put_device(&dev->dev);
6057 EXPORT_SYMBOL(free_netdev);
6060 * synchronize_net - Synchronize with packet receive processing
6062 * Wait for packets currently being received to be done.
6063 * Does not block later packets from starting.
6065 void synchronize_net(void)
6068 if (rtnl_is_locked())
6069 synchronize_rcu_expedited();
6073 EXPORT_SYMBOL(synchronize_net);
6076 * unregister_netdevice_queue - remove device from the kernel
6080 * This function shuts down a device interface and removes it
6081 * from the kernel tables.
6082 * If head not NULL, device is queued to be unregistered later.
6084 * Callers must hold the rtnl semaphore. You may want
6085 * unregister_netdev() instead of this.
6088 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
6093 list_move_tail(&dev->unreg_list, head);
6095 rollback_registered(dev);
6096 /* Finish processing unregister after unlock */
6100 EXPORT_SYMBOL(unregister_netdevice_queue);
6103 * unregister_netdevice_many - unregister many devices
6104 * @head: list of devices
6106 void unregister_netdevice_many(struct list_head *head)
6108 struct net_device *dev;
6110 if (!list_empty(head)) {
6111 rollback_registered_many(head);
6112 list_for_each_entry(dev, head, unreg_list)
6116 EXPORT_SYMBOL(unregister_netdevice_many);
6119 * unregister_netdev - remove device from the kernel
6122 * This function shuts down a device interface and removes it
6123 * from the kernel tables.
6125 * This is just a wrapper for unregister_netdevice that takes
6126 * the rtnl semaphore. In general you want to use this and not
6127 * unregister_netdevice.
6129 void unregister_netdev(struct net_device *dev)
6132 unregister_netdevice(dev);
6135 EXPORT_SYMBOL(unregister_netdev);
6138 * dev_change_net_namespace - move device to different nethost namespace
6140 * @net: network namespace
6141 * @pat: If not NULL name pattern to try if the current device name
6142 * is already taken in the destination network namespace.
6144 * This function shuts down a device interface and moves it
6145 * to a new network namespace. On success 0 is returned, on
6146 * a failure a netagive errno code is returned.
6148 * Callers must hold the rtnl semaphore.
6151 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
6157 /* Don't allow namespace local devices to be moved. */
6159 if (dev->features & NETIF_F_NETNS_LOCAL)
6162 /* Ensure the device has been registrered */
6164 if (dev->reg_state != NETREG_REGISTERED)
6167 /* Get out if there is nothing todo */
6169 if (net_eq(dev_net(dev), net))
6172 /* Pick the destination device name, and ensure
6173 * we can use it in the destination network namespace.
6176 if (__dev_get_by_name(net, dev->name)) {
6177 /* We get here if we can't use the current device name */
6180 if (dev_get_valid_name(dev, pat) < 0)
6185 * And now a mini version of register_netdevice unregister_netdevice.
6188 /* If device is running close it first. */
6191 /* And unlink it from device chain */
6193 unlist_netdevice(dev);
6197 /* Shutdown queueing discipline. */
6200 /* Notify protocols, that we are about to destroy
6201 this device. They should clean all the things.
6203 Note that dev->reg_state stays at NETREG_REGISTERED.
6204 This is wanted because this way 8021q and macvlan know
6205 the device is just moving and can keep their slaves up.
6207 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
6208 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
6209 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
6212 * Flush the unicast and multicast chains
6217 /* Actually switch the network namespace */
6218 dev_net_set(dev, net);
6220 /* If there is an ifindex conflict assign a new one */
6221 if (__dev_get_by_index(net, dev->ifindex)) {
6222 int iflink = (dev->iflink == dev->ifindex);
6223 dev->ifindex = dev_new_index(net);
6225 dev->iflink = dev->ifindex;
6228 /* Fixup kobjects */
6229 err = device_rename(&dev->dev, dev->name);
6232 /* Add the device back in the hashes */
6233 list_netdevice(dev);
6235 /* Notify protocols, that a new device appeared. */
6236 call_netdevice_notifiers(NETDEV_REGISTER, dev);
6239 * Prevent userspace races by waiting until the network
6240 * device is fully setup before sending notifications.
6242 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
6249 EXPORT_SYMBOL_GPL(dev_change_net_namespace);
6251 static int dev_cpu_callback(struct notifier_block *nfb,
6252 unsigned long action,
6255 struct sk_buff **list_skb;
6256 struct sk_buff *skb;
6257 unsigned int cpu, oldcpu = (unsigned long)ocpu;
6258 struct softnet_data *sd, *oldsd;
6260 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
6263 local_irq_disable();
6264 cpu = smp_processor_id();
6265 sd = &per_cpu(softnet_data, cpu);
6266 oldsd = &per_cpu(softnet_data, oldcpu);
6268 /* Find end of our completion_queue. */
6269 list_skb = &sd->completion_queue;
6271 list_skb = &(*list_skb)->next;
6272 /* Append completion queue from offline CPU. */
6273 *list_skb = oldsd->completion_queue;
6274 oldsd->completion_queue = NULL;
6276 /* Append output queue from offline CPU. */
6277 if (oldsd->output_queue) {
6278 *sd->output_queue_tailp = oldsd->output_queue;
6279 sd->output_queue_tailp = oldsd->output_queue_tailp;
6280 oldsd->output_queue = NULL;
6281 oldsd->output_queue_tailp = &oldsd->output_queue;
6283 /* Append NAPI poll list from offline CPU. */
6284 if (!list_empty(&oldsd->poll_list)) {
6285 list_splice_init(&oldsd->poll_list, &sd->poll_list);
6286 raise_softirq_irqoff(NET_RX_SOFTIRQ);
6289 raise_softirq_irqoff(NET_TX_SOFTIRQ);
6292 /* Process offline CPU's input_pkt_queue */
6293 while ((skb = __skb_dequeue(&oldsd->process_queue))) {
6295 input_queue_head_incr(oldsd);
6297 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) {
6299 input_queue_head_incr(oldsd);
6307 * netdev_increment_features - increment feature set by one
6308 * @all: current feature set
6309 * @one: new feature set
6310 * @mask: mask feature set
6312 * Computes a new feature set after adding a device with feature set
6313 * @one to the master device with current feature set @all. Will not
6314 * enable anything that is off in @mask. Returns the new feature set.
6316 netdev_features_t netdev_increment_features(netdev_features_t all,
6317 netdev_features_t one, netdev_features_t mask)
6319 if (mask & NETIF_F_GEN_CSUM)
6320 mask |= NETIF_F_ALL_CSUM;
6321 mask |= NETIF_F_VLAN_CHALLENGED;
6323 all |= one & (NETIF_F_ONE_FOR_ALL|NETIF_F_ALL_CSUM) & mask;
6324 all &= one | ~NETIF_F_ALL_FOR_ALL;
6326 /* If one device supports hw checksumming, set for all. */
6327 if (all & NETIF_F_GEN_CSUM)
6328 all &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_GEN_CSUM);
6332 EXPORT_SYMBOL(netdev_increment_features);
6334 static struct hlist_head *netdev_create_hash(void)
6337 struct hlist_head *hash;
6339 hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
6341 for (i = 0; i < NETDEV_HASHENTRIES; i++)
6342 INIT_HLIST_HEAD(&hash[i]);
6347 /* Initialize per network namespace state */
6348 static int __net_init netdev_init(struct net *net)
6350 INIT_LIST_HEAD(&net->dev_base_head);
6352 net->dev_name_head = netdev_create_hash();
6353 if (net->dev_name_head == NULL)
6356 net->dev_index_head = netdev_create_hash();
6357 if (net->dev_index_head == NULL)
6363 kfree(net->dev_name_head);
6369 * netdev_drivername - network driver for the device
6370 * @dev: network device
6372 * Determine network driver for device.
6374 const char *netdev_drivername(const struct net_device *dev)
6376 const struct device_driver *driver;
6377 const struct device *parent;
6378 const char *empty = "";
6380 parent = dev->dev.parent;
6384 driver = parent->driver;
6385 if (driver && driver->name)
6386 return driver->name;
6390 int __netdev_printk(const char *level, const struct net_device *dev,
6391 struct va_format *vaf)
6395 if (dev && dev->dev.parent)
6396 r = dev_printk(level, dev->dev.parent, "%s: %pV",
6397 netdev_name(dev), vaf);
6399 r = printk("%s%s: %pV", level, netdev_name(dev), vaf);
6401 r = printk("%s(NULL net_device): %pV", level, vaf);
6405 EXPORT_SYMBOL(__netdev_printk);
6407 int netdev_printk(const char *level, const struct net_device *dev,
6408 const char *format, ...)
6410 struct va_format vaf;
6414 va_start(args, format);
6419 r = __netdev_printk(level, dev, &vaf);
6424 EXPORT_SYMBOL(netdev_printk);
6426 #define define_netdev_printk_level(func, level) \
6427 int func(const struct net_device *dev, const char *fmt, ...) \
6430 struct va_format vaf; \
6433 va_start(args, fmt); \
6438 r = __netdev_printk(level, dev, &vaf); \
6443 EXPORT_SYMBOL(func);
6445 define_netdev_printk_level(netdev_emerg, KERN_EMERG);
6446 define_netdev_printk_level(netdev_alert, KERN_ALERT);
6447 define_netdev_printk_level(netdev_crit, KERN_CRIT);
6448 define_netdev_printk_level(netdev_err, KERN_ERR);
6449 define_netdev_printk_level(netdev_warn, KERN_WARNING);
6450 define_netdev_printk_level(netdev_notice, KERN_NOTICE);
6451 define_netdev_printk_level(netdev_info, KERN_INFO);
6453 static void __net_exit netdev_exit(struct net *net)
6455 kfree(net->dev_name_head);
6456 kfree(net->dev_index_head);
6459 static struct pernet_operations __net_initdata netdev_net_ops = {
6460 .init = netdev_init,
6461 .exit = netdev_exit,
6464 static void __net_exit default_device_exit(struct net *net)
6466 struct net_device *dev, *aux;
6468 * Push all migratable network devices back to the
6469 * initial network namespace
6472 for_each_netdev_safe(net, dev, aux) {
6474 char fb_name[IFNAMSIZ];
6476 /* Ignore unmoveable devices (i.e. loopback) */
6477 if (dev->features & NETIF_F_NETNS_LOCAL)
6480 /* Leave virtual devices for the generic cleanup */
6481 if (dev->rtnl_link_ops)
6484 /* Push remaining network devices to init_net */
6485 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
6486 err = dev_change_net_namespace(dev, &init_net, fb_name);
6488 printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
6489 __func__, dev->name, err);
6496 static void __net_exit default_device_exit_batch(struct list_head *net_list)
6498 /* At exit all network devices most be removed from a network
6499 * namespace. Do this in the reverse order of registration.
6500 * Do this across as many network namespaces as possible to
6501 * improve batching efficiency.
6503 struct net_device *dev;
6505 LIST_HEAD(dev_kill_list);
6508 list_for_each_entry(net, net_list, exit_list) {
6509 for_each_netdev_reverse(net, dev) {
6510 if (dev->rtnl_link_ops)
6511 dev->rtnl_link_ops->dellink(dev, &dev_kill_list);
6513 unregister_netdevice_queue(dev, &dev_kill_list);
6516 unregister_netdevice_many(&dev_kill_list);
6517 list_del(&dev_kill_list);
6521 static struct pernet_operations __net_initdata default_device_ops = {
6522 .exit = default_device_exit,
6523 .exit_batch = default_device_exit_batch,
6527 * Initialize the DEV module. At boot time this walks the device list and
6528 * unhooks any devices that fail to initialise (normally hardware not
6529 * present) and leaves us with a valid list of present and active devices.
6534 * This is called single threaded during boot, so no need
6535 * to take the rtnl semaphore.
6537 static int __init net_dev_init(void)
6539 int i, rc = -ENOMEM;
6541 BUG_ON(!dev_boot_phase);
6543 if (dev_proc_init())
6546 if (netdev_kobject_init())
6549 INIT_LIST_HEAD(&ptype_all);
6550 for (i = 0; i < PTYPE_HASH_SIZE; i++)
6551 INIT_LIST_HEAD(&ptype_base[i]);
6553 if (register_pernet_subsys(&netdev_net_ops))
6557 * Initialise the packet receive queues.
6560 for_each_possible_cpu(i) {
6561 struct softnet_data *sd = &per_cpu(softnet_data, i);
6563 memset(sd, 0, sizeof(*sd));
6564 skb_queue_head_init(&sd->input_pkt_queue);
6565 skb_queue_head_init(&sd->process_queue);
6566 sd->completion_queue = NULL;
6567 INIT_LIST_HEAD(&sd->poll_list);
6568 sd->output_queue = NULL;
6569 sd->output_queue_tailp = &sd->output_queue;
6571 sd->csd.func = rps_trigger_softirq;
6577 sd->backlog.poll = process_backlog;
6578 sd->backlog.weight = weight_p;
6579 sd->backlog.gro_list = NULL;
6580 sd->backlog.gro_count = 0;
6585 /* The loopback device is special if any other network devices
6586 * is present in a network namespace the loopback device must
6587 * be present. Since we now dynamically allocate and free the
6588 * loopback device ensure this invariant is maintained by
6589 * keeping the loopback device as the first device on the
6590 * list of network devices. Ensuring the loopback devices
6591 * is the first device that appears and the last network device
6594 if (register_pernet_device(&loopback_net_ops))
6597 if (register_pernet_device(&default_device_ops))
6600 open_softirq(NET_TX_SOFTIRQ, net_tx_action);
6601 open_softirq(NET_RX_SOFTIRQ, net_rx_action);
6603 hotcpu_notifier(dev_cpu_callback, 0);
6611 subsys_initcall(net_dev_init);
6613 static int __init initialize_hashrnd(void)
6615 get_random_bytes(&hashrnd, sizeof(hashrnd));
6619 late_initcall_sync(initialize_hashrnd);