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>
136 #include "net-sysfs.h"
138 /* Instead of increasing this, you should create a hash table. */
139 #define MAX_GRO_SKBS 8
141 /* This should be increased if a protocol with a bigger head is added. */
142 #define GRO_MAX_HEAD (MAX_HEADER + 128)
145 * The list of packet types we will receive (as opposed to discard)
146 * and the routines to invoke.
148 * Why 16. Because with 16 the only overlap we get on a hash of the
149 * low nibble of the protocol value is RARP/SNAP/X.25.
151 * NOTE: That is no longer true with the addition of VLAN tags. Not
152 * sure which should go first, but I bet it won't make much
153 * difference if we are running VLANs. The good news is that
154 * this protocol won't be in the list unless compiled in, so
155 * the average user (w/out VLANs) will not be adversely affected.
172 #define PTYPE_HASH_SIZE (16)
173 #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1)
175 static DEFINE_SPINLOCK(ptype_lock);
176 static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
177 static struct list_head ptype_all __read_mostly; /* Taps */
180 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
183 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
185 * Writers must hold the rtnl semaphore while they loop through the
186 * dev_base_head list, and hold dev_base_lock for writing when they do the
187 * actual updates. This allows pure readers to access the list even
188 * while a writer is preparing to update it.
190 * To put it another way, dev_base_lock is held for writing only to
191 * protect against pure readers; the rtnl semaphore provides the
192 * protection against other writers.
194 * See, for example usages, register_netdevice() and
195 * unregister_netdevice(), which must be called with the rtnl
198 DEFINE_RWLOCK(dev_base_lock);
199 EXPORT_SYMBOL(dev_base_lock);
201 static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
203 unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
204 return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)];
207 static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
209 return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)];
212 static inline void rps_lock(struct softnet_data *sd)
215 spin_lock(&sd->input_pkt_queue.lock);
219 static inline void rps_unlock(struct softnet_data *sd)
222 spin_unlock(&sd->input_pkt_queue.lock);
226 /* Device list insertion */
227 static int list_netdevice(struct net_device *dev)
229 struct net *net = dev_net(dev);
233 write_lock_bh(&dev_base_lock);
234 list_add_tail_rcu(&dev->dev_list, &net->dev_base_head);
235 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
236 hlist_add_head_rcu(&dev->index_hlist,
237 dev_index_hash(net, dev->ifindex));
238 write_unlock_bh(&dev_base_lock);
242 /* Device list removal
243 * caller must respect a RCU grace period before freeing/reusing dev
245 static void unlist_netdevice(struct net_device *dev)
249 /* Unlink dev from the device chain */
250 write_lock_bh(&dev_base_lock);
251 list_del_rcu(&dev->dev_list);
252 hlist_del_rcu(&dev->name_hlist);
253 hlist_del_rcu(&dev->index_hlist);
254 write_unlock_bh(&dev_base_lock);
261 static RAW_NOTIFIER_HEAD(netdev_chain);
264 * Device drivers call our routines to queue packets here. We empty the
265 * queue in the local softnet handler.
268 DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
269 EXPORT_PER_CPU_SYMBOL(softnet_data);
271 #ifdef CONFIG_LOCKDEP
273 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
274 * according to dev->type
276 static const unsigned short netdev_lock_type[] =
277 {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
278 ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
279 ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
280 ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
281 ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
282 ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
283 ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
284 ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
285 ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
286 ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
287 ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
288 ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
289 ARPHRD_FCFABRIC, ARPHRD_IEEE802_TR, ARPHRD_IEEE80211,
290 ARPHRD_IEEE80211_PRISM, ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET,
291 ARPHRD_PHONET_PIPE, ARPHRD_IEEE802154,
292 ARPHRD_VOID, ARPHRD_NONE};
294 static const char *const netdev_lock_name[] =
295 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
296 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
297 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
298 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
299 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
300 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
301 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
302 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
303 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
304 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
305 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
306 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
307 "_xmit_FCFABRIC", "_xmit_IEEE802_TR", "_xmit_IEEE80211",
308 "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET",
309 "_xmit_PHONET_PIPE", "_xmit_IEEE802154",
310 "_xmit_VOID", "_xmit_NONE"};
312 static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
313 static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)];
315 static inline unsigned short netdev_lock_pos(unsigned short dev_type)
319 for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++)
320 if (netdev_lock_type[i] == dev_type)
322 /* the last key is used by default */
323 return ARRAY_SIZE(netdev_lock_type) - 1;
326 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
327 unsigned short dev_type)
331 i = netdev_lock_pos(dev_type);
332 lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
333 netdev_lock_name[i]);
336 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
340 i = netdev_lock_pos(dev->type);
341 lockdep_set_class_and_name(&dev->addr_list_lock,
342 &netdev_addr_lock_key[i],
343 netdev_lock_name[i]);
346 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
347 unsigned short dev_type)
350 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
355 /*******************************************************************************
357 Protocol management and registration routines
359 *******************************************************************************/
362 * Add a protocol ID to the list. Now that the input handler is
363 * smarter we can dispense with all the messy stuff that used to be
366 * BEWARE!!! Protocol handlers, mangling input packets,
367 * MUST BE last in hash buckets and checking protocol handlers
368 * MUST start from promiscuous ptype_all chain in net_bh.
369 * It is true now, do not change it.
370 * Explanation follows: if protocol handler, mangling packet, will
371 * be the first on list, it is not able to sense, that packet
372 * is cloned and should be copied-on-write, so that it will
373 * change it and subsequent readers will get broken packet.
377 static inline struct list_head *ptype_head(const struct packet_type *pt)
379 if (pt->type == htons(ETH_P_ALL))
382 return &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
386 * dev_add_pack - add packet handler
387 * @pt: packet type declaration
389 * Add a protocol handler to the networking stack. The passed &packet_type
390 * is linked into kernel lists and may not be freed until it has been
391 * removed from the kernel lists.
393 * This call does not sleep therefore it can not
394 * guarantee all CPU's that are in middle of receiving packets
395 * will see the new packet type (until the next received packet).
398 void dev_add_pack(struct packet_type *pt)
400 struct list_head *head = ptype_head(pt);
402 spin_lock(&ptype_lock);
403 list_add_rcu(&pt->list, head);
404 spin_unlock(&ptype_lock);
406 EXPORT_SYMBOL(dev_add_pack);
409 * __dev_remove_pack - remove packet handler
410 * @pt: packet type declaration
412 * Remove a protocol handler that was previously added to the kernel
413 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
414 * from the kernel lists and can be freed or reused once this function
417 * The packet type might still be in use by receivers
418 * and must not be freed until after all the CPU's have gone
419 * through a quiescent state.
421 void __dev_remove_pack(struct packet_type *pt)
423 struct list_head *head = ptype_head(pt);
424 struct packet_type *pt1;
426 spin_lock(&ptype_lock);
428 list_for_each_entry(pt1, head, list) {
430 list_del_rcu(&pt->list);
435 printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt);
437 spin_unlock(&ptype_lock);
439 EXPORT_SYMBOL(__dev_remove_pack);
442 * dev_remove_pack - remove packet handler
443 * @pt: packet type declaration
445 * Remove a protocol handler that was previously added to the kernel
446 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
447 * from the kernel lists and can be freed or reused once this function
450 * This call sleeps to guarantee that no CPU is looking at the packet
453 void dev_remove_pack(struct packet_type *pt)
455 __dev_remove_pack(pt);
459 EXPORT_SYMBOL(dev_remove_pack);
461 /******************************************************************************
463 Device Boot-time Settings Routines
465 *******************************************************************************/
467 /* Boot time configuration table */
468 static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
471 * netdev_boot_setup_add - add new setup entry
472 * @name: name of the device
473 * @map: configured settings for the device
475 * Adds new setup entry to the dev_boot_setup list. The function
476 * returns 0 on error and 1 on success. This is a generic routine to
479 static int netdev_boot_setup_add(char *name, struct ifmap *map)
481 struct netdev_boot_setup *s;
485 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
486 if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
487 memset(s[i].name, 0, sizeof(s[i].name));
488 strlcpy(s[i].name, name, IFNAMSIZ);
489 memcpy(&s[i].map, map, sizeof(s[i].map));
494 return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
498 * netdev_boot_setup_check - check boot time settings
499 * @dev: the netdevice
501 * Check boot time settings for the device.
502 * The found settings are set for the device to be used
503 * later in the device probing.
504 * Returns 0 if no settings found, 1 if they are.
506 int netdev_boot_setup_check(struct net_device *dev)
508 struct netdev_boot_setup *s = dev_boot_setup;
511 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
512 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
513 !strcmp(dev->name, s[i].name)) {
514 dev->irq = s[i].map.irq;
515 dev->base_addr = s[i].map.base_addr;
516 dev->mem_start = s[i].map.mem_start;
517 dev->mem_end = s[i].map.mem_end;
523 EXPORT_SYMBOL(netdev_boot_setup_check);
527 * netdev_boot_base - get address from boot time settings
528 * @prefix: prefix for network device
529 * @unit: id for network device
531 * Check boot time settings for the base address of device.
532 * The found settings are set for the device to be used
533 * later in the device probing.
534 * Returns 0 if no settings found.
536 unsigned long netdev_boot_base(const char *prefix, int unit)
538 const struct netdev_boot_setup *s = dev_boot_setup;
542 sprintf(name, "%s%d", prefix, unit);
545 * If device already registered then return base of 1
546 * to indicate not to probe for this interface
548 if (__dev_get_by_name(&init_net, name))
551 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
552 if (!strcmp(name, s[i].name))
553 return s[i].map.base_addr;
558 * Saves at boot time configured settings for any netdevice.
560 int __init netdev_boot_setup(char *str)
565 str = get_options(str, ARRAY_SIZE(ints), ints);
570 memset(&map, 0, sizeof(map));
574 map.base_addr = ints[2];
576 map.mem_start = ints[3];
578 map.mem_end = ints[4];
580 /* Add new entry to the list */
581 return netdev_boot_setup_add(str, &map);
584 __setup("netdev=", netdev_boot_setup);
586 /*******************************************************************************
588 Device Interface Subroutines
590 *******************************************************************************/
593 * __dev_get_by_name - find a device by its name
594 * @net: the applicable net namespace
595 * @name: name to find
597 * Find an interface by name. Must be called under RTNL semaphore
598 * or @dev_base_lock. If the name is found a pointer to the device
599 * is returned. If the name is not found then %NULL is returned. The
600 * reference counters are not incremented so the caller must be
601 * careful with locks.
604 struct net_device *__dev_get_by_name(struct net *net, const char *name)
606 struct hlist_node *p;
607 struct net_device *dev;
608 struct hlist_head *head = dev_name_hash(net, name);
610 hlist_for_each_entry(dev, p, head, name_hlist)
611 if (!strncmp(dev->name, name, IFNAMSIZ))
616 EXPORT_SYMBOL(__dev_get_by_name);
619 * dev_get_by_name_rcu - find a device by its name
620 * @net: the applicable net namespace
621 * @name: name to find
623 * Find an interface by name.
624 * If the name is found a pointer to the device is returned.
625 * If the name is not found then %NULL is returned.
626 * The reference counters are not incremented so the caller must be
627 * careful with locks. The caller must hold RCU lock.
630 struct net_device *dev_get_by_name_rcu(struct net *net, const char *name)
632 struct hlist_node *p;
633 struct net_device *dev;
634 struct hlist_head *head = dev_name_hash(net, name);
636 hlist_for_each_entry_rcu(dev, p, head, name_hlist)
637 if (!strncmp(dev->name, name, IFNAMSIZ))
642 EXPORT_SYMBOL(dev_get_by_name_rcu);
645 * dev_get_by_name - find a device by its name
646 * @net: the applicable net namespace
647 * @name: name to find
649 * Find an interface by name. This can be called from any
650 * context and does its own locking. The returned handle has
651 * the usage count incremented and the caller must use dev_put() to
652 * release it when it is no longer needed. %NULL is returned if no
653 * matching device is found.
656 struct net_device *dev_get_by_name(struct net *net, const char *name)
658 struct net_device *dev;
661 dev = dev_get_by_name_rcu(net, name);
667 EXPORT_SYMBOL(dev_get_by_name);
670 * __dev_get_by_index - find a device by its ifindex
671 * @net: the applicable net namespace
672 * @ifindex: index of device
674 * Search for an interface by index. Returns %NULL if the device
675 * is not found or a pointer to the device. The device has not
676 * had its reference counter increased so the caller must be careful
677 * about locking. The caller must hold either the RTNL semaphore
681 struct net_device *__dev_get_by_index(struct net *net, int ifindex)
683 struct hlist_node *p;
684 struct net_device *dev;
685 struct hlist_head *head = dev_index_hash(net, ifindex);
687 hlist_for_each_entry(dev, p, head, index_hlist)
688 if (dev->ifindex == ifindex)
693 EXPORT_SYMBOL(__dev_get_by_index);
696 * dev_get_by_index_rcu - find a device by its ifindex
697 * @net: the applicable net namespace
698 * @ifindex: index of device
700 * Search for an interface by index. Returns %NULL if the device
701 * is not found or a pointer to the device. The device has not
702 * had its reference counter increased so the caller must be careful
703 * about locking. The caller must hold RCU lock.
706 struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex)
708 struct hlist_node *p;
709 struct net_device *dev;
710 struct hlist_head *head = dev_index_hash(net, ifindex);
712 hlist_for_each_entry_rcu(dev, p, head, index_hlist)
713 if (dev->ifindex == ifindex)
718 EXPORT_SYMBOL(dev_get_by_index_rcu);
722 * dev_get_by_index - find a device by its ifindex
723 * @net: the applicable net namespace
724 * @ifindex: index of device
726 * Search for an interface by index. Returns NULL if the device
727 * is not found or a pointer to the device. The device returned has
728 * had a reference added and the pointer is safe until the user calls
729 * dev_put to indicate they have finished with it.
732 struct net_device *dev_get_by_index(struct net *net, int ifindex)
734 struct net_device *dev;
737 dev = dev_get_by_index_rcu(net, ifindex);
743 EXPORT_SYMBOL(dev_get_by_index);
746 * dev_getbyhwaddr - find a device by its hardware address
747 * @net: the applicable net namespace
748 * @type: media type of device
749 * @ha: hardware address
751 * Search for an interface by MAC address. Returns NULL if the device
752 * is not found or a pointer to the device. The caller must hold the
753 * rtnl semaphore. The returned device has not had its ref count increased
754 * and the caller must therefore be careful about locking
757 * If the API was consistent this would be __dev_get_by_hwaddr
760 struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *ha)
762 struct net_device *dev;
766 for_each_netdev(net, dev)
767 if (dev->type == type &&
768 !memcmp(dev->dev_addr, ha, dev->addr_len))
773 EXPORT_SYMBOL(dev_getbyhwaddr);
775 struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
777 struct net_device *dev;
780 for_each_netdev(net, dev)
781 if (dev->type == type)
786 EXPORT_SYMBOL(__dev_getfirstbyhwtype);
788 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
790 struct net_device *dev, *ret = NULL;
793 for_each_netdev_rcu(net, dev)
794 if (dev->type == type) {
802 EXPORT_SYMBOL(dev_getfirstbyhwtype);
805 * dev_get_by_flags_rcu - find any device with given flags
806 * @net: the applicable net namespace
807 * @if_flags: IFF_* values
808 * @mask: bitmask of bits in if_flags to check
810 * Search for any interface with the given flags. Returns NULL if a device
811 * is not found or a pointer to the device. Must be called inside
812 * rcu_read_lock(), and result refcount is unchanged.
815 struct net_device *dev_get_by_flags_rcu(struct net *net, unsigned short if_flags,
818 struct net_device *dev, *ret;
821 for_each_netdev_rcu(net, dev) {
822 if (((dev->flags ^ if_flags) & mask) == 0) {
829 EXPORT_SYMBOL(dev_get_by_flags_rcu);
832 * dev_valid_name - check if name is okay for network device
835 * Network device names need to be valid file names to
836 * to allow sysfs to work. We also disallow any kind of
839 int dev_valid_name(const char *name)
843 if (strlen(name) >= IFNAMSIZ)
845 if (!strcmp(name, ".") || !strcmp(name, ".."))
849 if (*name == '/' || isspace(*name))
855 EXPORT_SYMBOL(dev_valid_name);
858 * __dev_alloc_name - allocate a name for a device
859 * @net: network namespace to allocate the device name in
860 * @name: name format string
861 * @buf: scratch buffer and result name string
863 * Passed a format string - eg "lt%d" it will try and find a suitable
864 * id. It scans list of devices to build up a free map, then chooses
865 * the first empty slot. The caller must hold the dev_base or rtnl lock
866 * while allocating the name and adding the device in order to avoid
868 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
869 * Returns the number of the unit assigned or a negative errno code.
872 static int __dev_alloc_name(struct net *net, const char *name, char *buf)
876 const int max_netdevices = 8*PAGE_SIZE;
877 unsigned long *inuse;
878 struct net_device *d;
880 p = strnchr(name, IFNAMSIZ-1, '%');
883 * Verify the string as this thing may have come from
884 * the user. There must be either one "%d" and no other "%"
887 if (p[1] != 'd' || strchr(p + 2, '%'))
890 /* Use one page as a bit array of possible slots */
891 inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
895 for_each_netdev(net, d) {
896 if (!sscanf(d->name, name, &i))
898 if (i < 0 || i >= max_netdevices)
901 /* avoid cases where sscanf is not exact inverse of printf */
902 snprintf(buf, IFNAMSIZ, name, i);
903 if (!strncmp(buf, d->name, IFNAMSIZ))
907 i = find_first_zero_bit(inuse, max_netdevices);
908 free_page((unsigned long) inuse);
912 snprintf(buf, IFNAMSIZ, name, i);
913 if (!__dev_get_by_name(net, buf))
916 /* It is possible to run out of possible slots
917 * when the name is long and there isn't enough space left
918 * for the digits, or if all bits are used.
924 * dev_alloc_name - allocate a name for a device
926 * @name: name format string
928 * Passed a format string - eg "lt%d" it will try and find a suitable
929 * id. It scans list of devices to build up a free map, then chooses
930 * the first empty slot. The caller must hold the dev_base or rtnl lock
931 * while allocating the name and adding the device in order to avoid
933 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
934 * Returns the number of the unit assigned or a negative errno code.
937 int dev_alloc_name(struct net_device *dev, const char *name)
943 BUG_ON(!dev_net(dev));
945 ret = __dev_alloc_name(net, name, buf);
947 strlcpy(dev->name, buf, IFNAMSIZ);
950 EXPORT_SYMBOL(dev_alloc_name);
952 static int dev_get_valid_name(struct net_device *dev, const char *name, bool fmt)
956 BUG_ON(!dev_net(dev));
959 if (!dev_valid_name(name))
962 if (fmt && strchr(name, '%'))
963 return dev_alloc_name(dev, name);
964 else if (__dev_get_by_name(net, name))
966 else if (dev->name != name)
967 strlcpy(dev->name, name, IFNAMSIZ);
973 * dev_change_name - change name of a device
975 * @newname: name (or format string) must be at least IFNAMSIZ
977 * Change name of a device, can pass format strings "eth%d".
980 int dev_change_name(struct net_device *dev, const char *newname)
982 char oldname[IFNAMSIZ];
988 BUG_ON(!dev_net(dev));
991 if (dev->flags & IFF_UP)
994 if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
997 memcpy(oldname, dev->name, IFNAMSIZ);
999 err = dev_get_valid_name(dev, newname, 1);
1004 ret = device_rename(&dev->dev, dev->name);
1006 memcpy(dev->name, oldname, IFNAMSIZ);
1010 write_lock_bh(&dev_base_lock);
1011 hlist_del(&dev->name_hlist);
1012 write_unlock_bh(&dev_base_lock);
1016 write_lock_bh(&dev_base_lock);
1017 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
1018 write_unlock_bh(&dev_base_lock);
1020 ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
1021 ret = notifier_to_errno(ret);
1024 /* err >= 0 after dev_alloc_name() or stores the first errno */
1027 memcpy(dev->name, oldname, IFNAMSIZ);
1031 "%s: name change rollback failed: %d.\n",
1040 * dev_set_alias - change ifalias of a device
1042 * @alias: name up to IFALIASZ
1043 * @len: limit of bytes to copy from info
1045 * Set ifalias for a device,
1047 int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
1051 if (len >= IFALIASZ)
1056 kfree(dev->ifalias);
1057 dev->ifalias = NULL;
1062 dev->ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL);
1066 strlcpy(dev->ifalias, alias, len+1);
1072 * netdev_features_change - device changes features
1073 * @dev: device to cause notification
1075 * Called to indicate a device has changed features.
1077 void netdev_features_change(struct net_device *dev)
1079 call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
1081 EXPORT_SYMBOL(netdev_features_change);
1084 * netdev_state_change - device changes state
1085 * @dev: device to cause notification
1087 * Called to indicate a device has changed state. This function calls
1088 * the notifier chains for netdev_chain and sends a NEWLINK message
1089 * to the routing socket.
1091 void netdev_state_change(struct net_device *dev)
1093 if (dev->flags & IFF_UP) {
1094 call_netdevice_notifiers(NETDEV_CHANGE, dev);
1095 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1098 EXPORT_SYMBOL(netdev_state_change);
1100 int netdev_bonding_change(struct net_device *dev, unsigned long event)
1102 return call_netdevice_notifiers(event, dev);
1104 EXPORT_SYMBOL(netdev_bonding_change);
1107 * dev_load - load a network module
1108 * @net: the applicable net namespace
1109 * @name: name of interface
1111 * If a network interface is not present and the process has suitable
1112 * privileges this function loads the module. If module loading is not
1113 * available in this kernel then it becomes a nop.
1116 void dev_load(struct net *net, const char *name)
1118 struct net_device *dev;
1121 dev = dev_get_by_name_rcu(net, name);
1124 if (!dev && capable(CAP_NET_ADMIN))
1125 request_module("%s", name);
1127 EXPORT_SYMBOL(dev_load);
1129 static int __dev_open(struct net_device *dev)
1131 const struct net_device_ops *ops = dev->netdev_ops;
1137 * Is it even present?
1139 if (!netif_device_present(dev))
1142 ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev);
1143 ret = notifier_to_errno(ret);
1148 * Call device private open method
1150 set_bit(__LINK_STATE_START, &dev->state);
1152 if (ops->ndo_validate_addr)
1153 ret = ops->ndo_validate_addr(dev);
1155 if (!ret && ops->ndo_open)
1156 ret = ops->ndo_open(dev);
1159 * If it went open OK then:
1163 clear_bit(__LINK_STATE_START, &dev->state);
1168 dev->flags |= IFF_UP;
1173 net_dmaengine_get();
1176 * Initialize multicasting status
1178 dev_set_rx_mode(dev);
1181 * Wakeup transmit queue engine
1190 * dev_open - prepare an interface for use.
1191 * @dev: device to open
1193 * Takes a device from down to up state. The device's private open
1194 * function is invoked and then the multicast lists are loaded. Finally
1195 * the device is moved into the up state and a %NETDEV_UP message is
1196 * sent to the netdev notifier chain.
1198 * Calling this function on an active interface is a nop. On a failure
1199 * a negative errno code is returned.
1201 int dev_open(struct net_device *dev)
1208 if (dev->flags & IFF_UP)
1214 ret = __dev_open(dev);
1219 * ... and announce new interface.
1221 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1222 call_netdevice_notifiers(NETDEV_UP, dev);
1226 EXPORT_SYMBOL(dev_open);
1228 static int __dev_close(struct net_device *dev)
1230 const struct net_device_ops *ops = dev->netdev_ops;
1236 * Tell people we are going down, so that they can
1237 * prepare to death, when device is still operating.
1239 call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
1241 clear_bit(__LINK_STATE_START, &dev->state);
1243 /* Synchronize to scheduled poll. We cannot touch poll list,
1244 * it can be even on different cpu. So just clear netif_running().
1246 * dev->stop() will invoke napi_disable() on all of it's
1247 * napi_struct instances on this device.
1249 smp_mb__after_clear_bit(); /* Commit netif_running(). */
1251 dev_deactivate(dev);
1254 * Call the device specific close. This cannot fail.
1255 * Only if device is UP
1257 * We allow it to be called even after a DETACH hot-plug
1264 * Device is now down.
1267 dev->flags &= ~IFF_UP;
1272 net_dmaengine_put();
1278 * dev_close - shutdown an interface.
1279 * @dev: device to shutdown
1281 * This function moves an active device into down state. A
1282 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1283 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1286 int dev_close(struct net_device *dev)
1288 if (!(dev->flags & IFF_UP))
1294 * Tell people we are down
1296 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1297 call_netdevice_notifiers(NETDEV_DOWN, dev);
1301 EXPORT_SYMBOL(dev_close);
1305 * dev_disable_lro - disable Large Receive Offload on a device
1308 * Disable Large Receive Offload (LRO) on a net device. Must be
1309 * called under RTNL. This is needed if received packets may be
1310 * forwarded to another interface.
1312 void dev_disable_lro(struct net_device *dev)
1314 if (dev->ethtool_ops && dev->ethtool_ops->get_flags &&
1315 dev->ethtool_ops->set_flags) {
1316 u32 flags = dev->ethtool_ops->get_flags(dev);
1317 if (flags & ETH_FLAG_LRO) {
1318 flags &= ~ETH_FLAG_LRO;
1319 dev->ethtool_ops->set_flags(dev, flags);
1322 WARN_ON(dev->features & NETIF_F_LRO);
1324 EXPORT_SYMBOL(dev_disable_lro);
1327 static int dev_boot_phase = 1;
1330 * Device change register/unregister. These are not inline or static
1331 * as we export them to the world.
1335 * register_netdevice_notifier - register a network notifier block
1338 * Register a notifier to be called when network device events occur.
1339 * The notifier passed is linked into the kernel structures and must
1340 * not be reused until it has been unregistered. A negative errno code
1341 * is returned on a failure.
1343 * When registered all registration and up events are replayed
1344 * to the new notifier to allow device to have a race free
1345 * view of the network device list.
1348 int register_netdevice_notifier(struct notifier_block *nb)
1350 struct net_device *dev;
1351 struct net_device *last;
1356 err = raw_notifier_chain_register(&netdev_chain, nb);
1362 for_each_netdev(net, dev) {
1363 err = nb->notifier_call(nb, NETDEV_REGISTER, dev);
1364 err = notifier_to_errno(err);
1368 if (!(dev->flags & IFF_UP))
1371 nb->notifier_call(nb, NETDEV_UP, dev);
1382 for_each_netdev(net, dev) {
1386 if (dev->flags & IFF_UP) {
1387 nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
1388 nb->notifier_call(nb, NETDEV_DOWN, dev);
1390 nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
1391 nb->notifier_call(nb, NETDEV_UNREGISTER_BATCH, dev);
1395 raw_notifier_chain_unregister(&netdev_chain, nb);
1398 EXPORT_SYMBOL(register_netdevice_notifier);
1401 * unregister_netdevice_notifier - unregister a network notifier block
1404 * Unregister a notifier previously registered by
1405 * register_netdevice_notifier(). The notifier is unlinked into the
1406 * kernel structures and may then be reused. A negative errno code
1407 * is returned on a failure.
1410 int unregister_netdevice_notifier(struct notifier_block *nb)
1415 err = raw_notifier_chain_unregister(&netdev_chain, nb);
1419 EXPORT_SYMBOL(unregister_netdevice_notifier);
1422 * call_netdevice_notifiers - call all network notifier blocks
1423 * @val: value passed unmodified to notifier function
1424 * @dev: net_device pointer passed unmodified to notifier function
1426 * Call all network notifier blocks. Parameters and return value
1427 * are as for raw_notifier_call_chain().
1430 int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
1433 return raw_notifier_call_chain(&netdev_chain, val, dev);
1436 /* When > 0 there are consumers of rx skb time stamps */
1437 static atomic_t netstamp_needed = ATOMIC_INIT(0);
1439 void net_enable_timestamp(void)
1441 atomic_inc(&netstamp_needed);
1443 EXPORT_SYMBOL(net_enable_timestamp);
1445 void net_disable_timestamp(void)
1447 atomic_dec(&netstamp_needed);
1449 EXPORT_SYMBOL(net_disable_timestamp);
1451 static inline void net_timestamp_set(struct sk_buff *skb)
1453 if (atomic_read(&netstamp_needed))
1454 __net_timestamp(skb);
1456 skb->tstamp.tv64 = 0;
1459 static inline void net_timestamp_check(struct sk_buff *skb)
1461 if (!skb->tstamp.tv64 && atomic_read(&netstamp_needed))
1462 __net_timestamp(skb);
1466 * dev_forward_skb - loopback an skb to another netif
1468 * @dev: destination network device
1469 * @skb: buffer to forward
1472 * NET_RX_SUCCESS (no congestion)
1473 * NET_RX_DROP (packet was dropped, but freed)
1475 * dev_forward_skb can be used for injecting an skb from the
1476 * start_xmit function of one device into the receive queue
1477 * of another device.
1479 * The receiving device may be in another namespace, so
1480 * we have to clear all information in the skb that could
1481 * impact namespace isolation.
1483 int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
1488 if (unlikely(!(dev->flags & IFF_UP) ||
1489 (skb->len > (dev->mtu + dev->hard_header_len + VLAN_HLEN)))) {
1490 atomic_long_inc(&dev->rx_dropped);
1494 skb_set_dev(skb, dev);
1495 skb->tstamp.tv64 = 0;
1496 skb->pkt_type = PACKET_HOST;
1497 skb->protocol = eth_type_trans(skb, dev);
1498 return netif_rx(skb);
1500 EXPORT_SYMBOL_GPL(dev_forward_skb);
1503 * Support routine. Sends outgoing frames to any network
1504 * taps currently in use.
1507 static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1509 struct packet_type *ptype;
1511 #ifdef CONFIG_NET_CLS_ACT
1512 if (!(skb->tstamp.tv64 && (G_TC_FROM(skb->tc_verd) & AT_INGRESS)))
1513 net_timestamp_set(skb);
1515 net_timestamp_set(skb);
1519 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1520 /* Never send packets back to the socket
1521 * they originated from - MvS (miquels@drinkel.ow.org)
1523 if ((ptype->dev == dev || !ptype->dev) &&
1524 (ptype->af_packet_priv == NULL ||
1525 (struct sock *)ptype->af_packet_priv != skb->sk)) {
1526 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
1530 /* skb->nh should be correctly
1531 set by sender, so that the second statement is
1532 just protection against buggy protocols.
1534 skb_reset_mac_header(skb2);
1536 if (skb_network_header(skb2) < skb2->data ||
1537 skb2->network_header > skb2->tail) {
1538 if (net_ratelimit())
1539 printk(KERN_CRIT "protocol %04x is "
1541 ntohs(skb2->protocol),
1543 skb_reset_network_header(skb2);
1546 skb2->transport_header = skb2->network_header;
1547 skb2->pkt_type = PACKET_OUTGOING;
1548 ptype->func(skb2, skb->dev, ptype, skb->dev);
1555 * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
1556 * greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
1558 int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq)
1562 if (txq < 1 || txq > dev->num_tx_queues)
1565 if (dev->reg_state == NETREG_REGISTERED) {
1568 rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues,
1570 if (txq < dev->real_num_tx_queues)
1571 qdisc_reset_all_tx_gt(dev, txq);
1574 dev->real_num_tx_queues = txq;
1577 EXPORT_SYMBOL(netif_set_real_num_tx_queues);
1581 * netif_set_real_num_rx_queues - set actual number of RX queues used
1582 * @dev: Network device
1583 * @rxq: Actual number of RX queues
1585 * This must be called either with the rtnl_lock held or before
1586 * registration of the net device. Returns 0 on success, or a
1587 * negative error code. If called before registration, it always
1590 int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq)
1594 if (rxq < 1 || rxq > dev->num_rx_queues)
1597 if (dev->reg_state == NETREG_REGISTERED) {
1600 rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues,
1606 dev->real_num_rx_queues = rxq;
1609 EXPORT_SYMBOL(netif_set_real_num_rx_queues);
1612 static inline void __netif_reschedule(struct Qdisc *q)
1614 struct softnet_data *sd;
1615 unsigned long flags;
1617 local_irq_save(flags);
1618 sd = &__get_cpu_var(softnet_data);
1619 q->next_sched = NULL;
1620 *sd->output_queue_tailp = q;
1621 sd->output_queue_tailp = &q->next_sched;
1622 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1623 local_irq_restore(flags);
1626 void __netif_schedule(struct Qdisc *q)
1628 if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
1629 __netif_reschedule(q);
1631 EXPORT_SYMBOL(__netif_schedule);
1633 void dev_kfree_skb_irq(struct sk_buff *skb)
1635 if (atomic_dec_and_test(&skb->users)) {
1636 struct softnet_data *sd;
1637 unsigned long flags;
1639 local_irq_save(flags);
1640 sd = &__get_cpu_var(softnet_data);
1641 skb->next = sd->completion_queue;
1642 sd->completion_queue = skb;
1643 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1644 local_irq_restore(flags);
1647 EXPORT_SYMBOL(dev_kfree_skb_irq);
1649 void dev_kfree_skb_any(struct sk_buff *skb)
1651 if (in_irq() || irqs_disabled())
1652 dev_kfree_skb_irq(skb);
1656 EXPORT_SYMBOL(dev_kfree_skb_any);
1660 * netif_device_detach - mark device as removed
1661 * @dev: network device
1663 * Mark device as removed from system and therefore no longer available.
1665 void netif_device_detach(struct net_device *dev)
1667 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
1668 netif_running(dev)) {
1669 netif_tx_stop_all_queues(dev);
1672 EXPORT_SYMBOL(netif_device_detach);
1675 * netif_device_attach - mark device as attached
1676 * @dev: network device
1678 * Mark device as attached from system and restart if needed.
1680 void netif_device_attach(struct net_device *dev)
1682 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
1683 netif_running(dev)) {
1684 netif_tx_wake_all_queues(dev);
1685 __netdev_watchdog_up(dev);
1688 EXPORT_SYMBOL(netif_device_attach);
1690 static bool can_checksum_protocol(unsigned long features, __be16 protocol)
1692 return ((features & NETIF_F_NO_CSUM) ||
1693 ((features & NETIF_F_V4_CSUM) &&
1694 protocol == htons(ETH_P_IP)) ||
1695 ((features & NETIF_F_V6_CSUM) &&
1696 protocol == htons(ETH_P_IPV6)) ||
1697 ((features & NETIF_F_FCOE_CRC) &&
1698 protocol == htons(ETH_P_FCOE)));
1701 static bool dev_can_checksum(struct net_device *dev, struct sk_buff *skb)
1703 __be16 protocol = skb->protocol;
1704 int features = dev->features;
1706 if (vlan_tx_tag_present(skb)) {
1707 features &= dev->vlan_features;
1708 } else if (protocol == htons(ETH_P_8021Q)) {
1709 struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
1710 protocol = veh->h_vlan_encapsulated_proto;
1711 features &= dev->vlan_features;
1714 return can_checksum_protocol(features, protocol);
1718 * skb_dev_set -- assign a new device to a buffer
1719 * @skb: buffer for the new device
1720 * @dev: network device
1722 * If an skb is owned by a device already, we have to reset
1723 * all data private to the namespace a device belongs to
1724 * before assigning it a new device.
1726 #ifdef CONFIG_NET_NS
1727 void skb_set_dev(struct sk_buff *skb, struct net_device *dev)
1730 if (skb->dev && !net_eq(dev_net(skb->dev), dev_net(dev))) {
1733 skb_init_secmark(skb);
1737 skb->ipvs_property = 0;
1738 #ifdef CONFIG_NET_SCHED
1744 EXPORT_SYMBOL(skb_set_dev);
1745 #endif /* CONFIG_NET_NS */
1748 * Invalidate hardware checksum when packet is to be mangled, and
1749 * complete checksum manually on outgoing path.
1751 int skb_checksum_help(struct sk_buff *skb)
1754 int ret = 0, offset;
1756 if (skb->ip_summed == CHECKSUM_COMPLETE)
1757 goto out_set_summed;
1759 if (unlikely(skb_shinfo(skb)->gso_size)) {
1760 /* Let GSO fix up the checksum. */
1761 goto out_set_summed;
1764 offset = skb->csum_start - skb_headroom(skb);
1765 BUG_ON(offset >= skb_headlen(skb));
1766 csum = skb_checksum(skb, offset, skb->len - offset, 0);
1768 offset += skb->csum_offset;
1769 BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
1771 if (skb_cloned(skb) &&
1772 !skb_clone_writable(skb, offset + sizeof(__sum16))) {
1773 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1778 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1780 skb->ip_summed = CHECKSUM_NONE;
1784 EXPORT_SYMBOL(skb_checksum_help);
1787 * skb_gso_segment - Perform segmentation on skb.
1788 * @skb: buffer to segment
1789 * @features: features for the output path (see dev->features)
1791 * This function segments the given skb and returns a list of segments.
1793 * It may return NULL if the skb requires no segmentation. This is
1794 * only possible when GSO is used for verifying header integrity.
1796 struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features)
1798 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
1799 struct packet_type *ptype;
1800 __be16 type = skb->protocol;
1801 int vlan_depth = ETH_HLEN;
1804 while (type == htons(ETH_P_8021Q)) {
1805 struct vlan_hdr *vh;
1807 if (unlikely(!pskb_may_pull(skb, vlan_depth + VLAN_HLEN)))
1808 return ERR_PTR(-EINVAL);
1810 vh = (struct vlan_hdr *)(skb->data + vlan_depth);
1811 type = vh->h_vlan_encapsulated_proto;
1812 vlan_depth += VLAN_HLEN;
1815 skb_reset_mac_header(skb);
1816 skb->mac_len = skb->network_header - skb->mac_header;
1817 __skb_pull(skb, skb->mac_len);
1819 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1820 struct net_device *dev = skb->dev;
1821 struct ethtool_drvinfo info = {};
1823 if (dev && dev->ethtool_ops && dev->ethtool_ops->get_drvinfo)
1824 dev->ethtool_ops->get_drvinfo(dev, &info);
1826 WARN(1, "%s: caps=(0x%lx, 0x%lx) len=%d data_len=%d ip_summed=%d\n",
1827 info.driver, dev ? dev->features : 0L,
1828 skb->sk ? skb->sk->sk_route_caps : 0L,
1829 skb->len, skb->data_len, skb->ip_summed);
1831 if (skb_header_cloned(skb) &&
1832 (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
1833 return ERR_PTR(err);
1837 list_for_each_entry_rcu(ptype,
1838 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
1839 if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1840 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1841 err = ptype->gso_send_check(skb);
1842 segs = ERR_PTR(err);
1843 if (err || skb_gso_ok(skb, features))
1845 __skb_push(skb, (skb->data -
1846 skb_network_header(skb)));
1848 segs = ptype->gso_segment(skb, features);
1854 __skb_push(skb, skb->data - skb_mac_header(skb));
1858 EXPORT_SYMBOL(skb_gso_segment);
1860 /* Take action when hardware reception checksum errors are detected. */
1862 void netdev_rx_csum_fault(struct net_device *dev)
1864 if (net_ratelimit()) {
1865 printk(KERN_ERR "%s: hw csum failure.\n",
1866 dev ? dev->name : "<unknown>");
1870 EXPORT_SYMBOL(netdev_rx_csum_fault);
1873 /* Actually, we should eliminate this check as soon as we know, that:
1874 * 1. IOMMU is present and allows to map all the memory.
1875 * 2. No high memory really exists on this machine.
1878 static int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
1880 #ifdef CONFIG_HIGHMEM
1882 if (!(dev->features & NETIF_F_HIGHDMA)) {
1883 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
1884 if (PageHighMem(skb_shinfo(skb)->frags[i].page))
1888 if (PCI_DMA_BUS_IS_PHYS) {
1889 struct device *pdev = dev->dev.parent;
1893 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1894 dma_addr_t addr = page_to_phys(skb_shinfo(skb)->frags[i].page);
1895 if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask)
1904 void (*destructor)(struct sk_buff *skb);
1907 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
1909 static void dev_gso_skb_destructor(struct sk_buff *skb)
1911 struct dev_gso_cb *cb;
1914 struct sk_buff *nskb = skb->next;
1916 skb->next = nskb->next;
1919 } while (skb->next);
1921 cb = DEV_GSO_CB(skb);
1923 cb->destructor(skb);
1927 * dev_gso_segment - Perform emulated hardware segmentation on skb.
1928 * @skb: buffer to segment
1930 * This function segments the given skb and stores the list of segments
1933 static int dev_gso_segment(struct sk_buff *skb)
1935 struct net_device *dev = skb->dev;
1936 struct sk_buff *segs;
1937 int features = dev->features & ~(illegal_highdma(dev, skb) ?
1940 segs = skb_gso_segment(skb, features);
1942 /* Verifying header integrity only. */
1947 return PTR_ERR(segs);
1950 DEV_GSO_CB(skb)->destructor = skb->destructor;
1951 skb->destructor = dev_gso_skb_destructor;
1957 * Try to orphan skb early, right before transmission by the device.
1958 * We cannot orphan skb if tx timestamp is requested or the sk-reference
1959 * is needed on driver level for other reasons, e.g. see net/can/raw.c
1961 static inline void skb_orphan_try(struct sk_buff *skb)
1963 struct sock *sk = skb->sk;
1965 if (sk && !skb_shinfo(skb)->tx_flags) {
1966 /* skb_tx_hash() wont be able to get sk.
1967 * We copy sk_hash into skb->rxhash
1970 skb->rxhash = sk->sk_hash;
1975 int netif_get_vlan_features(struct sk_buff *skb, struct net_device *dev)
1977 __be16 protocol = skb->protocol;
1979 if (protocol == htons(ETH_P_8021Q)) {
1980 struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
1981 protocol = veh->h_vlan_encapsulated_proto;
1982 } else if (!skb->vlan_tci)
1983 return dev->features;
1985 if (protocol != htons(ETH_P_8021Q))
1986 return dev->features & dev->vlan_features;
1990 EXPORT_SYMBOL(netif_get_vlan_features);
1993 * Returns true if either:
1994 * 1. skb has frag_list and the device doesn't support FRAGLIST, or
1995 * 2. skb is fragmented and the device does not support SG, or if
1996 * at least one of fragments is in highmem and device does not
1997 * support DMA from it.
1999 static inline int skb_needs_linearize(struct sk_buff *skb,
2000 struct net_device *dev)
2002 if (skb_is_nonlinear(skb)) {
2003 int features = dev->features;
2005 if (vlan_tx_tag_present(skb))
2006 features &= dev->vlan_features;
2008 return (skb_has_frag_list(skb) &&
2009 !(features & NETIF_F_FRAGLIST)) ||
2010 (skb_shinfo(skb)->nr_frags &&
2011 (!(features & NETIF_F_SG) ||
2012 illegal_highdma(dev, skb)));
2018 int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
2019 struct netdev_queue *txq)
2021 const struct net_device_ops *ops = dev->netdev_ops;
2022 int rc = NETDEV_TX_OK;
2024 if (likely(!skb->next)) {
2025 if (!list_empty(&ptype_all))
2026 dev_queue_xmit_nit(skb, dev);
2029 * If device doesnt need skb->dst, release it right now while
2030 * its hot in this cpu cache
2032 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
2035 skb_orphan_try(skb);
2037 if (vlan_tx_tag_present(skb) &&
2038 !(dev->features & NETIF_F_HW_VLAN_TX)) {
2039 skb = __vlan_put_tag(skb, vlan_tx_tag_get(skb));
2046 if (netif_needs_gso(dev, skb)) {
2047 if (unlikely(dev_gso_segment(skb)))
2052 if (skb_needs_linearize(skb, dev) &&
2053 __skb_linearize(skb))
2056 /* If packet is not checksummed and device does not
2057 * support checksumming for this protocol, complete
2058 * checksumming here.
2060 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2061 skb_set_transport_header(skb, skb->csum_start -
2063 if (!dev_can_checksum(dev, skb) &&
2064 skb_checksum_help(skb))
2069 rc = ops->ndo_start_xmit(skb, dev);
2070 trace_net_dev_xmit(skb, rc);
2071 if (rc == NETDEV_TX_OK)
2072 txq_trans_update(txq);
2078 struct sk_buff *nskb = skb->next;
2080 skb->next = nskb->next;
2084 * If device doesnt need nskb->dst, release it right now while
2085 * its hot in this cpu cache
2087 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
2090 rc = ops->ndo_start_xmit(nskb, dev);
2091 trace_net_dev_xmit(nskb, rc);
2092 if (unlikely(rc != NETDEV_TX_OK)) {
2093 if (rc & ~NETDEV_TX_MASK)
2094 goto out_kfree_gso_skb;
2095 nskb->next = skb->next;
2099 txq_trans_update(txq);
2100 if (unlikely(netif_tx_queue_stopped(txq) && skb->next))
2101 return NETDEV_TX_BUSY;
2102 } while (skb->next);
2105 if (likely(skb->next == NULL))
2106 skb->destructor = DEV_GSO_CB(skb)->destructor;
2113 static u32 hashrnd __read_mostly;
2115 u16 skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb)
2119 if (skb_rx_queue_recorded(skb)) {
2120 hash = skb_get_rx_queue(skb);
2121 while (unlikely(hash >= dev->real_num_tx_queues))
2122 hash -= dev->real_num_tx_queues;
2126 if (skb->sk && skb->sk->sk_hash)
2127 hash = skb->sk->sk_hash;
2129 hash = (__force u16) skb->protocol ^ skb->rxhash;
2130 hash = jhash_1word(hash, hashrnd);
2132 return (u16) (((u64) hash * dev->real_num_tx_queues) >> 32);
2134 EXPORT_SYMBOL(skb_tx_hash);
2136 static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index)
2138 if (unlikely(queue_index >= dev->real_num_tx_queues)) {
2139 if (net_ratelimit()) {
2140 pr_warning("%s selects TX queue %d, but "
2141 "real number of TX queues is %d\n",
2142 dev->name, queue_index, dev->real_num_tx_queues);
2149 static inline int get_xps_queue(struct net_device *dev, struct sk_buff *skb)
2152 struct xps_dev_maps *dev_maps;
2153 struct xps_map *map;
2154 int queue_index = -1;
2157 dev_maps = rcu_dereference(dev->xps_maps);
2159 map = rcu_dereference(
2160 dev_maps->cpu_map[raw_smp_processor_id()]);
2163 queue_index = map->queues[0];
2166 if (skb->sk && skb->sk->sk_hash)
2167 hash = skb->sk->sk_hash;
2169 hash = (__force u16) skb->protocol ^
2171 hash = jhash_1word(hash, hashrnd);
2172 queue_index = map->queues[
2173 ((u64)hash * map->len) >> 32];
2175 if (unlikely(queue_index >= dev->real_num_tx_queues))
2187 static struct netdev_queue *dev_pick_tx(struct net_device *dev,
2188 struct sk_buff *skb)
2191 const struct net_device_ops *ops = dev->netdev_ops;
2193 if (dev->real_num_tx_queues == 1)
2195 else if (ops->ndo_select_queue) {
2196 queue_index = ops->ndo_select_queue(dev, skb);
2197 queue_index = dev_cap_txqueue(dev, queue_index);
2199 struct sock *sk = skb->sk;
2200 queue_index = sk_tx_queue_get(sk);
2202 if (queue_index < 0 || skb->ooo_okay ||
2203 queue_index >= dev->real_num_tx_queues) {
2204 int old_index = queue_index;
2206 queue_index = get_xps_queue(dev, skb);
2207 if (queue_index < 0)
2208 queue_index = skb_tx_hash(dev, skb);
2210 if (queue_index != old_index && sk) {
2211 struct dst_entry *dst =
2212 rcu_dereference_check(sk->sk_dst_cache, 1);
2214 if (dst && skb_dst(skb) == dst)
2215 sk_tx_queue_set(sk, queue_index);
2220 skb_set_queue_mapping(skb, queue_index);
2221 return netdev_get_tx_queue(dev, queue_index);
2224 static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
2225 struct net_device *dev,
2226 struct netdev_queue *txq)
2228 spinlock_t *root_lock = qdisc_lock(q);
2229 bool contended = qdisc_is_running(q);
2233 * Heuristic to force contended enqueues to serialize on a
2234 * separate lock before trying to get qdisc main lock.
2235 * This permits __QDISC_STATE_RUNNING owner to get the lock more often
2236 * and dequeue packets faster.
2238 if (unlikely(contended))
2239 spin_lock(&q->busylock);
2241 spin_lock(root_lock);
2242 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
2245 } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) &&
2246 qdisc_run_begin(q)) {
2248 * This is a work-conserving queue; there are no old skbs
2249 * waiting to be sent out; and the qdisc is not running -
2250 * xmit the skb directly.
2252 if (!(dev->priv_flags & IFF_XMIT_DST_RELEASE))
2254 __qdisc_update_bstats(q, skb->len);
2255 if (sch_direct_xmit(skb, q, dev, txq, root_lock)) {
2256 if (unlikely(contended)) {
2257 spin_unlock(&q->busylock);
2264 rc = NET_XMIT_SUCCESS;
2267 rc = qdisc_enqueue_root(skb, q);
2268 if (qdisc_run_begin(q)) {
2269 if (unlikely(contended)) {
2270 spin_unlock(&q->busylock);
2276 spin_unlock(root_lock);
2277 if (unlikely(contended))
2278 spin_unlock(&q->busylock);
2282 static DEFINE_PER_CPU(int, xmit_recursion);
2283 #define RECURSION_LIMIT 10
2286 * dev_queue_xmit - transmit a buffer
2287 * @skb: buffer to transmit
2289 * Queue a buffer for transmission to a network device. The caller must
2290 * have set the device and priority and built the buffer before calling
2291 * this function. The function can be called from an interrupt.
2293 * A negative errno code is returned on a failure. A success does not
2294 * guarantee the frame will be transmitted as it may be dropped due
2295 * to congestion or traffic shaping.
2297 * -----------------------------------------------------------------------------------
2298 * I notice this method can also return errors from the queue disciplines,
2299 * including NET_XMIT_DROP, which is a positive value. So, errors can also
2302 * Regardless of the return value, the skb is consumed, so it is currently
2303 * difficult to retry a send to this method. (You can bump the ref count
2304 * before sending to hold a reference for retry if you are careful.)
2306 * When calling this method, interrupts MUST be enabled. This is because
2307 * the BH enable code must have IRQs enabled so that it will not deadlock.
2310 int dev_queue_xmit(struct sk_buff *skb)
2312 struct net_device *dev = skb->dev;
2313 struct netdev_queue *txq;
2317 /* Disable soft irqs for various locks below. Also
2318 * stops preemption for RCU.
2322 txq = dev_pick_tx(dev, skb);
2323 q = rcu_dereference_bh(txq->qdisc);
2325 #ifdef CONFIG_NET_CLS_ACT
2326 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS);
2328 trace_net_dev_queue(skb);
2330 rc = __dev_xmit_skb(skb, q, dev, txq);
2334 /* The device has no queue. Common case for software devices:
2335 loopback, all the sorts of tunnels...
2337 Really, it is unlikely that netif_tx_lock protection is necessary
2338 here. (f.e. loopback and IP tunnels are clean ignoring statistics
2340 However, it is possible, that they rely on protection
2343 Check this and shot the lock. It is not prone from deadlocks.
2344 Either shot noqueue qdisc, it is even simpler 8)
2346 if (dev->flags & IFF_UP) {
2347 int cpu = smp_processor_id(); /* ok because BHs are off */
2349 if (txq->xmit_lock_owner != cpu) {
2351 if (__this_cpu_read(xmit_recursion) > RECURSION_LIMIT)
2352 goto recursion_alert;
2354 HARD_TX_LOCK(dev, txq, cpu);
2356 if (!netif_tx_queue_stopped(txq)) {
2357 __this_cpu_inc(xmit_recursion);
2358 rc = dev_hard_start_xmit(skb, dev, txq);
2359 __this_cpu_dec(xmit_recursion);
2360 if (dev_xmit_complete(rc)) {
2361 HARD_TX_UNLOCK(dev, txq);
2365 HARD_TX_UNLOCK(dev, txq);
2366 if (net_ratelimit())
2367 printk(KERN_CRIT "Virtual device %s asks to "
2368 "queue packet!\n", dev->name);
2370 /* Recursion is detected! It is possible,
2374 if (net_ratelimit())
2375 printk(KERN_CRIT "Dead loop on virtual device "
2376 "%s, fix it urgently!\n", dev->name);
2381 rcu_read_unlock_bh();
2386 rcu_read_unlock_bh();
2389 EXPORT_SYMBOL(dev_queue_xmit);
2392 /*=======================================================================
2394 =======================================================================*/
2396 int netdev_max_backlog __read_mostly = 1000;
2397 int netdev_tstamp_prequeue __read_mostly = 1;
2398 int netdev_budget __read_mostly = 300;
2399 int weight_p __read_mostly = 64; /* old backlog weight */
2401 /* Called with irq disabled */
2402 static inline void ____napi_schedule(struct softnet_data *sd,
2403 struct napi_struct *napi)
2405 list_add_tail(&napi->poll_list, &sd->poll_list);
2406 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2410 * __skb_get_rxhash: calculate a flow hash based on src/dst addresses
2411 * and src/dst port numbers. Returns a non-zero hash number on success
2414 __u32 __skb_get_rxhash(struct sk_buff *skb)
2416 int nhoff, hash = 0, poff;
2417 struct ipv6hdr *ip6;
2420 u32 addr1, addr2, ihl;
2426 nhoff = skb_network_offset(skb);
2428 switch (skb->protocol) {
2429 case __constant_htons(ETH_P_IP):
2430 if (!pskb_may_pull(skb, sizeof(*ip) + nhoff))
2433 ip = (struct iphdr *) (skb->data + nhoff);
2434 if (ip->frag_off & htons(IP_MF | IP_OFFSET))
2437 ip_proto = ip->protocol;
2438 addr1 = (__force u32) ip->saddr;
2439 addr2 = (__force u32) ip->daddr;
2442 case __constant_htons(ETH_P_IPV6):
2443 if (!pskb_may_pull(skb, sizeof(*ip6) + nhoff))
2446 ip6 = (struct ipv6hdr *) (skb->data + nhoff);
2447 ip_proto = ip6->nexthdr;
2448 addr1 = (__force u32) ip6->saddr.s6_addr32[3];
2449 addr2 = (__force u32) ip6->daddr.s6_addr32[3];
2457 poff = proto_ports_offset(ip_proto);
2459 nhoff += ihl * 4 + poff;
2460 if (pskb_may_pull(skb, nhoff + 4)) {
2461 ports.v32 = * (__force u32 *) (skb->data + nhoff);
2462 if (ports.v16[1] < ports.v16[0])
2463 swap(ports.v16[0], ports.v16[1]);
2467 /* get a consistent hash (same value on both flow directions) */
2471 hash = jhash_3words(addr1, addr2, ports.v32, hashrnd);
2478 EXPORT_SYMBOL(__skb_get_rxhash);
2482 /* One global table that all flow-based protocols share. */
2483 struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly;
2484 EXPORT_SYMBOL(rps_sock_flow_table);
2487 * get_rps_cpu is called from netif_receive_skb and returns the target
2488 * CPU from the RPS map of the receiving queue for a given skb.
2489 * rcu_read_lock must be held on entry.
2491 static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
2492 struct rps_dev_flow **rflowp)
2494 struct netdev_rx_queue *rxqueue;
2495 struct rps_map *map;
2496 struct rps_dev_flow_table *flow_table;
2497 struct rps_sock_flow_table *sock_flow_table;
2501 if (skb_rx_queue_recorded(skb)) {
2502 u16 index = skb_get_rx_queue(skb);
2503 if (unlikely(index >= dev->real_num_rx_queues)) {
2504 WARN_ONCE(dev->real_num_rx_queues > 1,
2505 "%s received packet on queue %u, but number "
2506 "of RX queues is %u\n",
2507 dev->name, index, dev->real_num_rx_queues);
2510 rxqueue = dev->_rx + index;
2514 map = rcu_dereference(rxqueue->rps_map);
2516 if (map->len == 1) {
2517 tcpu = map->cpus[0];
2518 if (cpu_online(tcpu))
2522 } else if (!rcu_dereference_raw(rxqueue->rps_flow_table)) {
2526 skb_reset_network_header(skb);
2527 if (!skb_get_rxhash(skb))
2530 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2531 sock_flow_table = rcu_dereference(rps_sock_flow_table);
2532 if (flow_table && sock_flow_table) {
2534 struct rps_dev_flow *rflow;
2536 rflow = &flow_table->flows[skb->rxhash & flow_table->mask];
2539 next_cpu = sock_flow_table->ents[skb->rxhash &
2540 sock_flow_table->mask];
2543 * If the desired CPU (where last recvmsg was done) is
2544 * different from current CPU (one in the rx-queue flow
2545 * table entry), switch if one of the following holds:
2546 * - Current CPU is unset (equal to RPS_NO_CPU).
2547 * - Current CPU is offline.
2548 * - The current CPU's queue tail has advanced beyond the
2549 * last packet that was enqueued using this table entry.
2550 * This guarantees that all previous packets for the flow
2551 * have been dequeued, thus preserving in order delivery.
2553 if (unlikely(tcpu != next_cpu) &&
2554 (tcpu == RPS_NO_CPU || !cpu_online(tcpu) ||
2555 ((int)(per_cpu(softnet_data, tcpu).input_queue_head -
2556 rflow->last_qtail)) >= 0)) {
2557 tcpu = rflow->cpu = next_cpu;
2558 if (tcpu != RPS_NO_CPU)
2559 rflow->last_qtail = per_cpu(softnet_data,
2560 tcpu).input_queue_head;
2562 if (tcpu != RPS_NO_CPU && cpu_online(tcpu)) {
2570 tcpu = map->cpus[((u64) skb->rxhash * map->len) >> 32];
2572 if (cpu_online(tcpu)) {
2582 /* Called from hardirq (IPI) context */
2583 static void rps_trigger_softirq(void *data)
2585 struct softnet_data *sd = data;
2587 ____napi_schedule(sd, &sd->backlog);
2591 #endif /* CONFIG_RPS */
2594 * Check if this softnet_data structure is another cpu one
2595 * If yes, queue it to our IPI list and return 1
2598 static int rps_ipi_queued(struct softnet_data *sd)
2601 struct softnet_data *mysd = &__get_cpu_var(softnet_data);
2604 sd->rps_ipi_next = mysd->rps_ipi_list;
2605 mysd->rps_ipi_list = sd;
2607 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2610 #endif /* CONFIG_RPS */
2615 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
2616 * queue (may be a remote CPU queue).
2618 static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
2619 unsigned int *qtail)
2621 struct softnet_data *sd;
2622 unsigned long flags;
2624 sd = &per_cpu(softnet_data, cpu);
2626 local_irq_save(flags);
2629 if (skb_queue_len(&sd->input_pkt_queue) <= netdev_max_backlog) {
2630 if (skb_queue_len(&sd->input_pkt_queue)) {
2632 __skb_queue_tail(&sd->input_pkt_queue, skb);
2633 input_queue_tail_incr_save(sd, qtail);
2635 local_irq_restore(flags);
2636 return NET_RX_SUCCESS;
2639 /* Schedule NAPI for backlog device
2640 * We can use non atomic operation since we own the queue lock
2642 if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) {
2643 if (!rps_ipi_queued(sd))
2644 ____napi_schedule(sd, &sd->backlog);
2652 local_irq_restore(flags);
2654 atomic_long_inc(&skb->dev->rx_dropped);
2660 * netif_rx - post buffer to the network code
2661 * @skb: buffer to post
2663 * This function receives a packet from a device driver and queues it for
2664 * the upper (protocol) levels to process. It always succeeds. The buffer
2665 * may be dropped during processing for congestion control or by the
2669 * NET_RX_SUCCESS (no congestion)
2670 * NET_RX_DROP (packet was dropped)
2674 int netif_rx(struct sk_buff *skb)
2678 /* if netpoll wants it, pretend we never saw it */
2679 if (netpoll_rx(skb))
2682 if (netdev_tstamp_prequeue)
2683 net_timestamp_check(skb);
2685 trace_netif_rx(skb);
2688 struct rps_dev_flow voidflow, *rflow = &voidflow;
2694 cpu = get_rps_cpu(skb->dev, skb, &rflow);
2696 cpu = smp_processor_id();
2698 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
2706 ret = enqueue_to_backlog(skb, get_cpu(), &qtail);
2712 EXPORT_SYMBOL(netif_rx);
2714 int netif_rx_ni(struct sk_buff *skb)
2719 err = netif_rx(skb);
2720 if (local_softirq_pending())
2726 EXPORT_SYMBOL(netif_rx_ni);
2728 static void net_tx_action(struct softirq_action *h)
2730 struct softnet_data *sd = &__get_cpu_var(softnet_data);
2732 if (sd->completion_queue) {
2733 struct sk_buff *clist;
2735 local_irq_disable();
2736 clist = sd->completion_queue;
2737 sd->completion_queue = NULL;
2741 struct sk_buff *skb = clist;
2742 clist = clist->next;
2744 WARN_ON(atomic_read(&skb->users));
2745 trace_kfree_skb(skb, net_tx_action);
2750 if (sd->output_queue) {
2753 local_irq_disable();
2754 head = sd->output_queue;
2755 sd->output_queue = NULL;
2756 sd->output_queue_tailp = &sd->output_queue;
2760 struct Qdisc *q = head;
2761 spinlock_t *root_lock;
2763 head = head->next_sched;
2765 root_lock = qdisc_lock(q);
2766 if (spin_trylock(root_lock)) {
2767 smp_mb__before_clear_bit();
2768 clear_bit(__QDISC_STATE_SCHED,
2771 spin_unlock(root_lock);
2773 if (!test_bit(__QDISC_STATE_DEACTIVATED,
2775 __netif_reschedule(q);
2777 smp_mb__before_clear_bit();
2778 clear_bit(__QDISC_STATE_SCHED,
2786 static inline int deliver_skb(struct sk_buff *skb,
2787 struct packet_type *pt_prev,
2788 struct net_device *orig_dev)
2790 atomic_inc(&skb->users);
2791 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2794 #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
2795 (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
2796 /* This hook is defined here for ATM LANE */
2797 int (*br_fdb_test_addr_hook)(struct net_device *dev,
2798 unsigned char *addr) __read_mostly;
2799 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
2802 #ifdef CONFIG_NET_CLS_ACT
2803 /* TODO: Maybe we should just force sch_ingress to be compiled in
2804 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
2805 * a compare and 2 stores extra right now if we dont have it on
2806 * but have CONFIG_NET_CLS_ACT
2807 * NOTE: This doesnt stop any functionality; if you dont have
2808 * the ingress scheduler, you just cant add policies on ingress.
2811 static int ing_filter(struct sk_buff *skb, struct netdev_queue *rxq)
2813 struct net_device *dev = skb->dev;
2814 u32 ttl = G_TC_RTTL(skb->tc_verd);
2815 int result = TC_ACT_OK;
2818 if (unlikely(MAX_RED_LOOP < ttl++)) {
2819 if (net_ratelimit())
2820 pr_warning( "Redir loop detected Dropping packet (%d->%d)\n",
2821 skb->skb_iif, dev->ifindex);
2825 skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
2826 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
2829 if (q != &noop_qdisc) {
2830 spin_lock(qdisc_lock(q));
2831 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
2832 result = qdisc_enqueue_root(skb, q);
2833 spin_unlock(qdisc_lock(q));
2839 static inline struct sk_buff *handle_ing(struct sk_buff *skb,
2840 struct packet_type **pt_prev,
2841 int *ret, struct net_device *orig_dev)
2843 struct netdev_queue *rxq = rcu_dereference(skb->dev->ingress_queue);
2845 if (!rxq || rxq->qdisc == &noop_qdisc)
2849 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2853 switch (ing_filter(skb, rxq)) {
2867 * netdev_rx_handler_register - register receive handler
2868 * @dev: device to register a handler for
2869 * @rx_handler: receive handler to register
2870 * @rx_handler_data: data pointer that is used by rx handler
2872 * Register a receive hander for a device. This handler will then be
2873 * called from __netif_receive_skb. A negative errno code is returned
2876 * The caller must hold the rtnl_mutex.
2878 int netdev_rx_handler_register(struct net_device *dev,
2879 rx_handler_func_t *rx_handler,
2880 void *rx_handler_data)
2884 if (dev->rx_handler)
2887 rcu_assign_pointer(dev->rx_handler_data, rx_handler_data);
2888 rcu_assign_pointer(dev->rx_handler, rx_handler);
2892 EXPORT_SYMBOL_GPL(netdev_rx_handler_register);
2895 * netdev_rx_handler_unregister - unregister receive handler
2896 * @dev: device to unregister a handler from
2898 * Unregister a receive hander from a device.
2900 * The caller must hold the rtnl_mutex.
2902 void netdev_rx_handler_unregister(struct net_device *dev)
2906 rcu_assign_pointer(dev->rx_handler, NULL);
2907 rcu_assign_pointer(dev->rx_handler_data, NULL);
2909 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister);
2911 static inline void skb_bond_set_mac_by_master(struct sk_buff *skb,
2912 struct net_device *master)
2914 if (skb->pkt_type == PACKET_HOST) {
2915 u16 *dest = (u16 *) eth_hdr(skb)->h_dest;
2917 memcpy(dest, master->dev_addr, ETH_ALEN);
2921 /* On bonding slaves other than the currently active slave, suppress
2922 * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and
2923 * ARP on active-backup slaves with arp_validate enabled.
2925 int __skb_bond_should_drop(struct sk_buff *skb, struct net_device *master)
2927 struct net_device *dev = skb->dev;
2929 if (master->priv_flags & IFF_MASTER_ARPMON)
2930 dev->last_rx = jiffies;
2932 if ((master->priv_flags & IFF_MASTER_ALB) &&
2933 (master->priv_flags & IFF_BRIDGE_PORT)) {
2934 /* Do address unmangle. The local destination address
2935 * will be always the one master has. Provides the right
2936 * functionality in a bridge.
2938 skb_bond_set_mac_by_master(skb, master);
2941 if (dev->priv_flags & IFF_SLAVE_INACTIVE) {
2942 if ((dev->priv_flags & IFF_SLAVE_NEEDARP) &&
2943 skb->protocol == __cpu_to_be16(ETH_P_ARP))
2946 if (master->priv_flags & IFF_MASTER_ALB) {
2947 if (skb->pkt_type != PACKET_BROADCAST &&
2948 skb->pkt_type != PACKET_MULTICAST)
2951 if (master->priv_flags & IFF_MASTER_8023AD &&
2952 skb->protocol == __cpu_to_be16(ETH_P_SLOW))
2959 EXPORT_SYMBOL(__skb_bond_should_drop);
2961 static int __netif_receive_skb(struct sk_buff *skb)
2963 struct packet_type *ptype, *pt_prev;
2964 rx_handler_func_t *rx_handler;
2965 struct net_device *orig_dev;
2966 struct net_device *master;
2967 struct net_device *null_or_orig;
2968 struct net_device *orig_or_bond;
2969 int ret = NET_RX_DROP;
2972 if (!netdev_tstamp_prequeue)
2973 net_timestamp_check(skb);
2975 trace_netif_receive_skb(skb);
2977 /* if we've gotten here through NAPI, check netpoll */
2978 if (netpoll_receive_skb(skb))
2982 skb->skb_iif = skb->dev->ifindex;
2985 * bonding note: skbs received on inactive slaves should only
2986 * be delivered to pkt handlers that are exact matches. Also
2987 * the deliver_no_wcard flag will be set. If packet handlers
2988 * are sensitive to duplicate packets these skbs will need to
2989 * be dropped at the handler.
2991 null_or_orig = NULL;
2992 orig_dev = skb->dev;
2993 master = ACCESS_ONCE(orig_dev->master);
2994 if (skb->deliver_no_wcard)
2995 null_or_orig = orig_dev;
2997 if (skb_bond_should_drop(skb, master)) {
2998 skb->deliver_no_wcard = 1;
2999 null_or_orig = orig_dev; /* deliver only exact match */
3004 __this_cpu_inc(softnet_data.processed);
3005 skb_reset_network_header(skb);
3006 skb_reset_transport_header(skb);
3007 skb->mac_len = skb->network_header - skb->mac_header;
3013 #ifdef CONFIG_NET_CLS_ACT
3014 if (skb->tc_verd & TC_NCLS) {
3015 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
3020 list_for_each_entry_rcu(ptype, &ptype_all, list) {
3021 if (ptype->dev == null_or_orig || ptype->dev == skb->dev ||
3022 ptype->dev == orig_dev) {
3024 ret = deliver_skb(skb, pt_prev, orig_dev);
3029 #ifdef CONFIG_NET_CLS_ACT
3030 skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
3036 /* Handle special case of bridge or macvlan */
3037 rx_handler = rcu_dereference(skb->dev->rx_handler);
3040 ret = deliver_skb(skb, pt_prev, orig_dev);
3043 skb = rx_handler(skb);
3048 if (vlan_tx_tag_present(skb)) {
3050 ret = deliver_skb(skb, pt_prev, orig_dev);
3053 if (vlan_hwaccel_do_receive(&skb)) {
3054 ret = __netif_receive_skb(skb);
3056 } else if (unlikely(!skb))
3061 * Make sure frames received on VLAN interfaces stacked on
3062 * bonding interfaces still make their way to any base bonding
3063 * device that may have registered for a specific ptype. The
3064 * handler may have to adjust skb->dev and orig_dev.
3066 orig_or_bond = orig_dev;
3067 if ((skb->dev->priv_flags & IFF_802_1Q_VLAN) &&
3068 (vlan_dev_real_dev(skb->dev)->priv_flags & IFF_BONDING)) {
3069 orig_or_bond = vlan_dev_real_dev(skb->dev);
3072 type = skb->protocol;
3073 list_for_each_entry_rcu(ptype,
3074 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
3075 if (ptype->type == type && (ptype->dev == null_or_orig ||
3076 ptype->dev == skb->dev || ptype->dev == orig_dev ||
3077 ptype->dev == orig_or_bond)) {
3079 ret = deliver_skb(skb, pt_prev, orig_dev);
3085 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
3087 atomic_long_inc(&skb->dev->rx_dropped);
3089 /* Jamal, now you will not able to escape explaining
3090 * me how you were going to use this. :-)
3101 * netif_receive_skb - process receive buffer from network
3102 * @skb: buffer to process
3104 * netif_receive_skb() is the main receive data processing function.
3105 * It always succeeds. The buffer may be dropped during processing
3106 * for congestion control or by the protocol layers.
3108 * This function may only be called from softirq context and interrupts
3109 * should be enabled.
3111 * Return values (usually ignored):
3112 * NET_RX_SUCCESS: no congestion
3113 * NET_RX_DROP: packet was dropped
3115 int netif_receive_skb(struct sk_buff *skb)
3117 if (netdev_tstamp_prequeue)
3118 net_timestamp_check(skb);
3120 if (skb_defer_rx_timestamp(skb))
3121 return NET_RX_SUCCESS;
3125 struct rps_dev_flow voidflow, *rflow = &voidflow;
3130 cpu = get_rps_cpu(skb->dev, skb, &rflow);
3133 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
3137 ret = __netif_receive_skb(skb);
3143 return __netif_receive_skb(skb);
3146 EXPORT_SYMBOL(netif_receive_skb);
3148 /* Network device is going away, flush any packets still pending
3149 * Called with irqs disabled.
3151 static void flush_backlog(void *arg)
3153 struct net_device *dev = arg;
3154 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3155 struct sk_buff *skb, *tmp;
3158 skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) {
3159 if (skb->dev == dev) {
3160 __skb_unlink(skb, &sd->input_pkt_queue);
3162 input_queue_head_incr(sd);
3167 skb_queue_walk_safe(&sd->process_queue, skb, tmp) {
3168 if (skb->dev == dev) {
3169 __skb_unlink(skb, &sd->process_queue);
3171 input_queue_head_incr(sd);
3176 static int napi_gro_complete(struct sk_buff *skb)
3178 struct packet_type *ptype;
3179 __be16 type = skb->protocol;
3180 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
3183 if (NAPI_GRO_CB(skb)->count == 1) {
3184 skb_shinfo(skb)->gso_size = 0;
3189 list_for_each_entry_rcu(ptype, head, list) {
3190 if (ptype->type != type || ptype->dev || !ptype->gro_complete)
3193 err = ptype->gro_complete(skb);
3199 WARN_ON(&ptype->list == head);
3201 return NET_RX_SUCCESS;
3205 return netif_receive_skb(skb);
3208 inline void napi_gro_flush(struct napi_struct *napi)
3210 struct sk_buff *skb, *next;
3212 for (skb = napi->gro_list; skb; skb = next) {
3215 napi_gro_complete(skb);
3218 napi->gro_count = 0;
3219 napi->gro_list = NULL;
3221 EXPORT_SYMBOL(napi_gro_flush);
3223 enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3225 struct sk_buff **pp = NULL;
3226 struct packet_type *ptype;
3227 __be16 type = skb->protocol;
3228 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
3231 enum gro_result ret;
3233 if (!(skb->dev->features & NETIF_F_GRO) || netpoll_rx_on(skb))
3236 if (skb_is_gso(skb) || skb_has_frag_list(skb))
3240 list_for_each_entry_rcu(ptype, head, list) {
3241 if (ptype->type != type || ptype->dev || !ptype->gro_receive)
3244 skb_set_network_header(skb, skb_gro_offset(skb));
3245 mac_len = skb->network_header - skb->mac_header;
3246 skb->mac_len = mac_len;
3247 NAPI_GRO_CB(skb)->same_flow = 0;
3248 NAPI_GRO_CB(skb)->flush = 0;
3249 NAPI_GRO_CB(skb)->free = 0;
3251 pp = ptype->gro_receive(&napi->gro_list, skb);
3256 if (&ptype->list == head)
3259 same_flow = NAPI_GRO_CB(skb)->same_flow;
3260 ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
3263 struct sk_buff *nskb = *pp;
3267 napi_gro_complete(nskb);
3274 if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS)
3278 NAPI_GRO_CB(skb)->count = 1;
3279 skb_shinfo(skb)->gso_size = skb_gro_len(skb);
3280 skb->next = napi->gro_list;
3281 napi->gro_list = skb;
3285 if (skb_headlen(skb) < skb_gro_offset(skb)) {
3286 int grow = skb_gro_offset(skb) - skb_headlen(skb);
3288 BUG_ON(skb->end - skb->tail < grow);
3290 memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);
3293 skb->data_len -= grow;
3295 skb_shinfo(skb)->frags[0].page_offset += grow;
3296 skb_shinfo(skb)->frags[0].size -= grow;
3298 if (unlikely(!skb_shinfo(skb)->frags[0].size)) {
3299 put_page(skb_shinfo(skb)->frags[0].page);
3300 memmove(skb_shinfo(skb)->frags,
3301 skb_shinfo(skb)->frags + 1,
3302 --skb_shinfo(skb)->nr_frags * sizeof(skb_frag_t));
3313 EXPORT_SYMBOL(dev_gro_receive);
3315 static inline gro_result_t
3316 __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3320 for (p = napi->gro_list; p; p = p->next) {
3321 unsigned long diffs;
3323 diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev;
3324 diffs |= p->vlan_tci ^ skb->vlan_tci;
3325 diffs |= compare_ether_header(skb_mac_header(p),
3326 skb_gro_mac_header(skb));
3327 NAPI_GRO_CB(p)->same_flow = !diffs;
3328 NAPI_GRO_CB(p)->flush = 0;
3331 return dev_gro_receive(napi, skb);
3334 gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
3338 if (netif_receive_skb(skb))
3343 case GRO_MERGED_FREE:
3354 EXPORT_SYMBOL(napi_skb_finish);
3356 void skb_gro_reset_offset(struct sk_buff *skb)
3358 NAPI_GRO_CB(skb)->data_offset = 0;
3359 NAPI_GRO_CB(skb)->frag0 = NULL;
3360 NAPI_GRO_CB(skb)->frag0_len = 0;
3362 if (skb->mac_header == skb->tail &&
3363 !PageHighMem(skb_shinfo(skb)->frags[0].page)) {
3364 NAPI_GRO_CB(skb)->frag0 =
3365 page_address(skb_shinfo(skb)->frags[0].page) +
3366 skb_shinfo(skb)->frags[0].page_offset;
3367 NAPI_GRO_CB(skb)->frag0_len = skb_shinfo(skb)->frags[0].size;
3370 EXPORT_SYMBOL(skb_gro_reset_offset);
3372 gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3374 skb_gro_reset_offset(skb);
3376 return napi_skb_finish(__napi_gro_receive(napi, skb), skb);
3378 EXPORT_SYMBOL(napi_gro_receive);
3380 static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
3382 __skb_pull(skb, skb_headlen(skb));
3383 skb_reserve(skb, NET_IP_ALIGN - skb_headroom(skb));
3389 struct sk_buff *napi_get_frags(struct napi_struct *napi)
3391 struct sk_buff *skb = napi->skb;
3394 skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD);
3400 EXPORT_SYMBOL(napi_get_frags);
3402 gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb,
3408 skb->protocol = eth_type_trans(skb, skb->dev);
3410 if (ret == GRO_HELD)
3411 skb_gro_pull(skb, -ETH_HLEN);
3412 else if (netif_receive_skb(skb))
3417 case GRO_MERGED_FREE:
3418 napi_reuse_skb(napi, skb);
3427 EXPORT_SYMBOL(napi_frags_finish);
3429 struct sk_buff *napi_frags_skb(struct napi_struct *napi)
3431 struct sk_buff *skb = napi->skb;
3438 skb_reset_mac_header(skb);
3439 skb_gro_reset_offset(skb);
3441 off = skb_gro_offset(skb);
3442 hlen = off + sizeof(*eth);
3443 eth = skb_gro_header_fast(skb, off);
3444 if (skb_gro_header_hard(skb, hlen)) {
3445 eth = skb_gro_header_slow(skb, hlen, off);
3446 if (unlikely(!eth)) {
3447 napi_reuse_skb(napi, skb);
3453 skb_gro_pull(skb, sizeof(*eth));
3456 * This works because the only protocols we care about don't require
3457 * special handling. We'll fix it up properly at the end.
3459 skb->protocol = eth->h_proto;
3464 EXPORT_SYMBOL(napi_frags_skb);
3466 gro_result_t napi_gro_frags(struct napi_struct *napi)
3468 struct sk_buff *skb = napi_frags_skb(napi);
3473 return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb));
3475 EXPORT_SYMBOL(napi_gro_frags);
3478 * net_rps_action sends any pending IPI's for rps.
3479 * Note: called with local irq disabled, but exits with local irq enabled.
3481 static void net_rps_action_and_irq_enable(struct softnet_data *sd)
3484 struct softnet_data *remsd = sd->rps_ipi_list;
3487 sd->rps_ipi_list = NULL;
3491 /* Send pending IPI's to kick RPS processing on remote cpus. */
3493 struct softnet_data *next = remsd->rps_ipi_next;
3495 if (cpu_online(remsd->cpu))
3496 __smp_call_function_single(remsd->cpu,
3505 static int process_backlog(struct napi_struct *napi, int quota)
3508 struct softnet_data *sd = container_of(napi, struct softnet_data, backlog);
3511 /* Check if we have pending ipi, its better to send them now,
3512 * not waiting net_rx_action() end.
3514 if (sd->rps_ipi_list) {
3515 local_irq_disable();
3516 net_rps_action_and_irq_enable(sd);
3519 napi->weight = weight_p;
3520 local_irq_disable();
3521 while (work < quota) {
3522 struct sk_buff *skb;
3525 while ((skb = __skb_dequeue(&sd->process_queue))) {
3527 __netif_receive_skb(skb);
3528 local_irq_disable();
3529 input_queue_head_incr(sd);
3530 if (++work >= quota) {
3537 qlen = skb_queue_len(&sd->input_pkt_queue);
3539 skb_queue_splice_tail_init(&sd->input_pkt_queue,
3540 &sd->process_queue);
3542 if (qlen < quota - work) {
3544 * Inline a custom version of __napi_complete().
3545 * only current cpu owns and manipulates this napi,
3546 * and NAPI_STATE_SCHED is the only possible flag set on backlog.
3547 * we can use a plain write instead of clear_bit(),
3548 * and we dont need an smp_mb() memory barrier.
3550 list_del(&napi->poll_list);
3553 quota = work + qlen;
3563 * __napi_schedule - schedule for receive
3564 * @n: entry to schedule
3566 * The entry's receive function will be scheduled to run
3568 void __napi_schedule(struct napi_struct *n)
3570 unsigned long flags;
3572 local_irq_save(flags);
3573 ____napi_schedule(&__get_cpu_var(softnet_data), n);
3574 local_irq_restore(flags);
3576 EXPORT_SYMBOL(__napi_schedule);
3578 void __napi_complete(struct napi_struct *n)
3580 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
3581 BUG_ON(n->gro_list);
3583 list_del(&n->poll_list);
3584 smp_mb__before_clear_bit();
3585 clear_bit(NAPI_STATE_SCHED, &n->state);
3587 EXPORT_SYMBOL(__napi_complete);
3589 void napi_complete(struct napi_struct *n)
3591 unsigned long flags;
3594 * don't let napi dequeue from the cpu poll list
3595 * just in case its running on a different cpu
3597 if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state)))
3601 local_irq_save(flags);
3603 local_irq_restore(flags);
3605 EXPORT_SYMBOL(napi_complete);
3607 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
3608 int (*poll)(struct napi_struct *, int), int weight)
3610 INIT_LIST_HEAD(&napi->poll_list);
3611 napi->gro_count = 0;
3612 napi->gro_list = NULL;
3615 napi->weight = weight;
3616 list_add(&napi->dev_list, &dev->napi_list);
3618 #ifdef CONFIG_NETPOLL
3619 spin_lock_init(&napi->poll_lock);
3620 napi->poll_owner = -1;
3622 set_bit(NAPI_STATE_SCHED, &napi->state);
3624 EXPORT_SYMBOL(netif_napi_add);
3626 void netif_napi_del(struct napi_struct *napi)
3628 struct sk_buff *skb, *next;
3630 list_del_init(&napi->dev_list);
3631 napi_free_frags(napi);
3633 for (skb = napi->gro_list; skb; skb = next) {
3639 napi->gro_list = NULL;
3640 napi->gro_count = 0;
3642 EXPORT_SYMBOL(netif_napi_del);
3644 static void net_rx_action(struct softirq_action *h)
3646 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3647 unsigned long time_limit = jiffies + 2;
3648 int budget = netdev_budget;
3651 local_irq_disable();
3653 while (!list_empty(&sd->poll_list)) {
3654 struct napi_struct *n;
3657 /* If softirq window is exhuasted then punt.
3658 * Allow this to run for 2 jiffies since which will allow
3659 * an average latency of 1.5/HZ.
3661 if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
3666 /* Even though interrupts have been re-enabled, this
3667 * access is safe because interrupts can only add new
3668 * entries to the tail of this list, and only ->poll()
3669 * calls can remove this head entry from the list.
3671 n = list_first_entry(&sd->poll_list, struct napi_struct, poll_list);
3673 have = netpoll_poll_lock(n);
3677 /* This NAPI_STATE_SCHED test is for avoiding a race
3678 * with netpoll's poll_napi(). Only the entity which
3679 * obtains the lock and sees NAPI_STATE_SCHED set will
3680 * actually make the ->poll() call. Therefore we avoid
3681 * accidently calling ->poll() when NAPI is not scheduled.
3684 if (test_bit(NAPI_STATE_SCHED, &n->state)) {
3685 work = n->poll(n, weight);
3689 WARN_ON_ONCE(work > weight);
3693 local_irq_disable();
3695 /* Drivers must not modify the NAPI state if they
3696 * consume the entire weight. In such cases this code
3697 * still "owns" the NAPI instance and therefore can
3698 * move the instance around on the list at-will.
3700 if (unlikely(work == weight)) {
3701 if (unlikely(napi_disable_pending(n))) {
3704 local_irq_disable();
3706 list_move_tail(&n->poll_list, &sd->poll_list);
3709 netpoll_poll_unlock(have);
3712 net_rps_action_and_irq_enable(sd);
3714 #ifdef CONFIG_NET_DMA
3716 * There may not be any more sk_buffs coming right now, so push
3717 * any pending DMA copies to hardware
3719 dma_issue_pending_all();
3726 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3730 static gifconf_func_t *gifconf_list[NPROTO];
3733 * register_gifconf - register a SIOCGIF handler
3734 * @family: Address family
3735 * @gifconf: Function handler
3737 * Register protocol dependent address dumping routines. The handler
3738 * that is passed must not be freed or reused until it has been replaced
3739 * by another handler.
3741 int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
3743 if (family >= NPROTO)
3745 gifconf_list[family] = gifconf;
3748 EXPORT_SYMBOL(register_gifconf);
3752 * Map an interface index to its name (SIOCGIFNAME)
3756 * We need this ioctl for efficient implementation of the
3757 * if_indextoname() function required by the IPv6 API. Without
3758 * it, we would have to search all the interfaces to find a
3762 static int dev_ifname(struct net *net, struct ifreq __user *arg)
3764 struct net_device *dev;
3768 * Fetch the caller's info block.
3771 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
3775 dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex);
3781 strcpy(ifr.ifr_name, dev->name);
3784 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
3790 * Perform a SIOCGIFCONF call. This structure will change
3791 * size eventually, and there is nothing I can do about it.
3792 * Thus we will need a 'compatibility mode'.
3795 static int dev_ifconf(struct net *net, char __user *arg)
3798 struct net_device *dev;
3805 * Fetch the caller's info block.
3808 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
3815 * Loop over the interfaces, and write an info block for each.
3819 for_each_netdev(net, dev) {
3820 for (i = 0; i < NPROTO; i++) {
3821 if (gifconf_list[i]) {
3824 done = gifconf_list[i](dev, NULL, 0);
3826 done = gifconf_list[i](dev, pos + total,
3836 * All done. Write the updated control block back to the caller.
3838 ifc.ifc_len = total;
3841 * Both BSD and Solaris return 0 here, so we do too.
3843 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
3846 #ifdef CONFIG_PROC_FS
3848 * This is invoked by the /proc filesystem handler to display a device
3851 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
3854 struct net *net = seq_file_net(seq);
3856 struct net_device *dev;
3860 return SEQ_START_TOKEN;
3863 for_each_netdev_rcu(net, dev)
3870 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3872 struct net_device *dev = (v == SEQ_START_TOKEN) ?
3873 first_net_device(seq_file_net(seq)) :
3874 next_net_device((struct net_device *)v);
3877 return rcu_dereference(dev);
3880 void dev_seq_stop(struct seq_file *seq, void *v)
3886 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
3888 struct rtnl_link_stats64 temp;
3889 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
3891 seq_printf(seq, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu "
3892 "%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n",
3893 dev->name, stats->rx_bytes, stats->rx_packets,
3895 stats->rx_dropped + stats->rx_missed_errors,
3896 stats->rx_fifo_errors,
3897 stats->rx_length_errors + stats->rx_over_errors +
3898 stats->rx_crc_errors + stats->rx_frame_errors,
3899 stats->rx_compressed, stats->multicast,
3900 stats->tx_bytes, stats->tx_packets,
3901 stats->tx_errors, stats->tx_dropped,
3902 stats->tx_fifo_errors, stats->collisions,
3903 stats->tx_carrier_errors +
3904 stats->tx_aborted_errors +
3905 stats->tx_window_errors +
3906 stats->tx_heartbeat_errors,
3907 stats->tx_compressed);
3911 * Called from the PROCfs module. This now uses the new arbitrary sized
3912 * /proc/net interface to create /proc/net/dev
3914 static int dev_seq_show(struct seq_file *seq, void *v)
3916 if (v == SEQ_START_TOKEN)
3917 seq_puts(seq, "Inter-| Receive "
3919 " face |bytes packets errs drop fifo frame "
3920 "compressed multicast|bytes packets errs "
3921 "drop fifo colls carrier compressed\n");
3923 dev_seq_printf_stats(seq, v);
3927 static struct softnet_data *softnet_get_online(loff_t *pos)
3929 struct softnet_data *sd = NULL;
3931 while (*pos < nr_cpu_ids)
3932 if (cpu_online(*pos)) {
3933 sd = &per_cpu(softnet_data, *pos);
3940 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
3942 return softnet_get_online(pos);
3945 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3948 return softnet_get_online(pos);
3951 static void softnet_seq_stop(struct seq_file *seq, void *v)
3955 static int softnet_seq_show(struct seq_file *seq, void *v)
3957 struct softnet_data *sd = v;
3959 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
3960 sd->processed, sd->dropped, sd->time_squeeze, 0,
3961 0, 0, 0, 0, /* was fastroute */
3962 sd->cpu_collision, sd->received_rps);
3966 static const struct seq_operations dev_seq_ops = {
3967 .start = dev_seq_start,
3968 .next = dev_seq_next,
3969 .stop = dev_seq_stop,
3970 .show = dev_seq_show,
3973 static int dev_seq_open(struct inode *inode, struct file *file)
3975 return seq_open_net(inode, file, &dev_seq_ops,
3976 sizeof(struct seq_net_private));
3979 static const struct file_operations dev_seq_fops = {
3980 .owner = THIS_MODULE,
3981 .open = dev_seq_open,
3983 .llseek = seq_lseek,
3984 .release = seq_release_net,
3987 static const struct seq_operations softnet_seq_ops = {
3988 .start = softnet_seq_start,
3989 .next = softnet_seq_next,
3990 .stop = softnet_seq_stop,
3991 .show = softnet_seq_show,
3994 static int softnet_seq_open(struct inode *inode, struct file *file)
3996 return seq_open(file, &softnet_seq_ops);
3999 static const struct file_operations softnet_seq_fops = {
4000 .owner = THIS_MODULE,
4001 .open = softnet_seq_open,
4003 .llseek = seq_lseek,
4004 .release = seq_release,
4007 static void *ptype_get_idx(loff_t pos)
4009 struct packet_type *pt = NULL;
4013 list_for_each_entry_rcu(pt, &ptype_all, list) {
4019 for (t = 0; t < PTYPE_HASH_SIZE; t++) {
4020 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
4029 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
4033 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
4036 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4038 struct packet_type *pt;
4039 struct list_head *nxt;
4043 if (v == SEQ_START_TOKEN)
4044 return ptype_get_idx(0);
4047 nxt = pt->list.next;
4048 if (pt->type == htons(ETH_P_ALL)) {
4049 if (nxt != &ptype_all)
4052 nxt = ptype_base[0].next;
4054 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
4056 while (nxt == &ptype_base[hash]) {
4057 if (++hash >= PTYPE_HASH_SIZE)
4059 nxt = ptype_base[hash].next;
4062 return list_entry(nxt, struct packet_type, list);
4065 static void ptype_seq_stop(struct seq_file *seq, void *v)
4071 static int ptype_seq_show(struct seq_file *seq, void *v)
4073 struct packet_type *pt = v;
4075 if (v == SEQ_START_TOKEN)
4076 seq_puts(seq, "Type Device Function\n");
4077 else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
4078 if (pt->type == htons(ETH_P_ALL))
4079 seq_puts(seq, "ALL ");
4081 seq_printf(seq, "%04x", ntohs(pt->type));
4083 seq_printf(seq, " %-8s %pF\n",
4084 pt->dev ? pt->dev->name : "", pt->func);
4090 static const struct seq_operations ptype_seq_ops = {
4091 .start = ptype_seq_start,
4092 .next = ptype_seq_next,
4093 .stop = ptype_seq_stop,
4094 .show = ptype_seq_show,
4097 static int ptype_seq_open(struct inode *inode, struct file *file)
4099 return seq_open_net(inode, file, &ptype_seq_ops,
4100 sizeof(struct seq_net_private));
4103 static const struct file_operations ptype_seq_fops = {
4104 .owner = THIS_MODULE,
4105 .open = ptype_seq_open,
4107 .llseek = seq_lseek,
4108 .release = seq_release_net,
4112 static int __net_init dev_proc_net_init(struct net *net)
4116 if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
4118 if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
4120 if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
4123 if (wext_proc_init(net))
4129 proc_net_remove(net, "ptype");
4131 proc_net_remove(net, "softnet_stat");
4133 proc_net_remove(net, "dev");
4137 static void __net_exit dev_proc_net_exit(struct net *net)
4139 wext_proc_exit(net);
4141 proc_net_remove(net, "ptype");
4142 proc_net_remove(net, "softnet_stat");
4143 proc_net_remove(net, "dev");
4146 static struct pernet_operations __net_initdata dev_proc_ops = {
4147 .init = dev_proc_net_init,
4148 .exit = dev_proc_net_exit,
4151 static int __init dev_proc_init(void)
4153 return register_pernet_subsys(&dev_proc_ops);
4156 #define dev_proc_init() 0
4157 #endif /* CONFIG_PROC_FS */
4161 * netdev_set_master - set up master/slave pair
4162 * @slave: slave device
4163 * @master: new master device
4165 * Changes the master device of the slave. Pass %NULL to break the
4166 * bonding. The caller must hold the RTNL semaphore. On a failure
4167 * a negative errno code is returned. On success the reference counts
4168 * are adjusted, %RTM_NEWLINK is sent to the routing socket and the
4169 * function returns zero.
4171 int netdev_set_master(struct net_device *slave, struct net_device *master)
4173 struct net_device *old = slave->master;
4183 slave->master = master;
4190 slave->flags |= IFF_SLAVE;
4192 slave->flags &= ~IFF_SLAVE;
4194 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
4197 EXPORT_SYMBOL(netdev_set_master);
4199 static void dev_change_rx_flags(struct net_device *dev, int flags)
4201 const struct net_device_ops *ops = dev->netdev_ops;
4203 if ((dev->flags & IFF_UP) && ops->ndo_change_rx_flags)
4204 ops->ndo_change_rx_flags(dev, flags);
4207 static int __dev_set_promiscuity(struct net_device *dev, int inc)
4209 unsigned short old_flags = dev->flags;
4215 dev->flags |= IFF_PROMISC;
4216 dev->promiscuity += inc;
4217 if (dev->promiscuity == 0) {
4220 * If inc causes overflow, untouch promisc and return error.
4223 dev->flags &= ~IFF_PROMISC;
4225 dev->promiscuity -= inc;
4226 printk(KERN_WARNING "%s: promiscuity touches roof, "
4227 "set promiscuity failed, promiscuity feature "
4228 "of device might be broken.\n", dev->name);
4232 if (dev->flags != old_flags) {
4233 printk(KERN_INFO "device %s %s promiscuous mode\n",
4234 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
4236 if (audit_enabled) {
4237 current_uid_gid(&uid, &gid);
4238 audit_log(current->audit_context, GFP_ATOMIC,
4239 AUDIT_ANOM_PROMISCUOUS,
4240 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
4241 dev->name, (dev->flags & IFF_PROMISC),
4242 (old_flags & IFF_PROMISC),
4243 audit_get_loginuid(current),
4245 audit_get_sessionid(current));
4248 dev_change_rx_flags(dev, IFF_PROMISC);
4254 * dev_set_promiscuity - update promiscuity count on a device
4258 * Add or remove promiscuity from a device. While the count in the device
4259 * remains above zero the interface remains promiscuous. Once it hits zero
4260 * the device reverts back to normal filtering operation. A negative inc
4261 * value is used to drop promiscuity on the device.
4262 * Return 0 if successful or a negative errno code on error.
4264 int dev_set_promiscuity(struct net_device *dev, int inc)
4266 unsigned short old_flags = dev->flags;
4269 err = __dev_set_promiscuity(dev, inc);
4272 if (dev->flags != old_flags)
4273 dev_set_rx_mode(dev);
4276 EXPORT_SYMBOL(dev_set_promiscuity);
4279 * dev_set_allmulti - update allmulti count on a device
4283 * Add or remove reception of all multicast frames to a device. While the
4284 * count in the device remains above zero the interface remains listening
4285 * to all interfaces. Once it hits zero the device reverts back to normal
4286 * filtering operation. A negative @inc value is used to drop the counter
4287 * when releasing a resource needing all multicasts.
4288 * Return 0 if successful or a negative errno code on error.
4291 int dev_set_allmulti(struct net_device *dev, int inc)
4293 unsigned short old_flags = dev->flags;
4297 dev->flags |= IFF_ALLMULTI;
4298 dev->allmulti += inc;
4299 if (dev->allmulti == 0) {
4302 * If inc causes overflow, untouch allmulti and return error.
4305 dev->flags &= ~IFF_ALLMULTI;
4307 dev->allmulti -= inc;
4308 printk(KERN_WARNING "%s: allmulti touches roof, "
4309 "set allmulti failed, allmulti feature of "
4310 "device might be broken.\n", dev->name);
4314 if (dev->flags ^ old_flags) {
4315 dev_change_rx_flags(dev, IFF_ALLMULTI);
4316 dev_set_rx_mode(dev);
4320 EXPORT_SYMBOL(dev_set_allmulti);
4323 * Upload unicast and multicast address lists to device and
4324 * configure RX filtering. When the device doesn't support unicast
4325 * filtering it is put in promiscuous mode while unicast addresses
4328 void __dev_set_rx_mode(struct net_device *dev)
4330 const struct net_device_ops *ops = dev->netdev_ops;
4332 /* dev_open will call this function so the list will stay sane. */
4333 if (!(dev->flags&IFF_UP))
4336 if (!netif_device_present(dev))
4339 if (ops->ndo_set_rx_mode)
4340 ops->ndo_set_rx_mode(dev);
4342 /* Unicast addresses changes may only happen under the rtnl,
4343 * therefore calling __dev_set_promiscuity here is safe.
4345 if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
4346 __dev_set_promiscuity(dev, 1);
4347 dev->uc_promisc = 1;
4348 } else if (netdev_uc_empty(dev) && dev->uc_promisc) {
4349 __dev_set_promiscuity(dev, -1);
4350 dev->uc_promisc = 0;
4353 if (ops->ndo_set_multicast_list)
4354 ops->ndo_set_multicast_list(dev);
4358 void dev_set_rx_mode(struct net_device *dev)
4360 netif_addr_lock_bh(dev);
4361 __dev_set_rx_mode(dev);
4362 netif_addr_unlock_bh(dev);
4366 * dev_get_flags - get flags reported to userspace
4369 * Get the combination of flag bits exported through APIs to userspace.
4371 unsigned dev_get_flags(const struct net_device *dev)
4375 flags = (dev->flags & ~(IFF_PROMISC |
4380 (dev->gflags & (IFF_PROMISC |
4383 if (netif_running(dev)) {
4384 if (netif_oper_up(dev))
4385 flags |= IFF_RUNNING;
4386 if (netif_carrier_ok(dev))
4387 flags |= IFF_LOWER_UP;
4388 if (netif_dormant(dev))
4389 flags |= IFF_DORMANT;
4394 EXPORT_SYMBOL(dev_get_flags);
4396 int __dev_change_flags(struct net_device *dev, unsigned int flags)
4398 int old_flags = dev->flags;
4404 * Set the flags on our device.
4407 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
4408 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
4410 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
4414 * Load in the correct multicast list now the flags have changed.
4417 if ((old_flags ^ flags) & IFF_MULTICAST)
4418 dev_change_rx_flags(dev, IFF_MULTICAST);
4420 dev_set_rx_mode(dev);
4423 * Have we downed the interface. We handle IFF_UP ourselves
4424 * according to user attempts to set it, rather than blindly
4429 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
4430 ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev);
4433 dev_set_rx_mode(dev);
4436 if ((flags ^ dev->gflags) & IFF_PROMISC) {
4437 int inc = (flags & IFF_PROMISC) ? 1 : -1;
4439 dev->gflags ^= IFF_PROMISC;
4440 dev_set_promiscuity(dev, inc);
4443 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
4444 is important. Some (broken) drivers set IFF_PROMISC, when
4445 IFF_ALLMULTI is requested not asking us and not reporting.
4447 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
4448 int inc = (flags & IFF_ALLMULTI) ? 1 : -1;
4450 dev->gflags ^= IFF_ALLMULTI;
4451 dev_set_allmulti(dev, inc);
4457 void __dev_notify_flags(struct net_device *dev, unsigned int old_flags)
4459 unsigned int changes = dev->flags ^ old_flags;
4461 if (changes & IFF_UP) {
4462 if (dev->flags & IFF_UP)
4463 call_netdevice_notifiers(NETDEV_UP, dev);
4465 call_netdevice_notifiers(NETDEV_DOWN, dev);
4468 if (dev->flags & IFF_UP &&
4469 (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE)))
4470 call_netdevice_notifiers(NETDEV_CHANGE, dev);
4474 * dev_change_flags - change device settings
4476 * @flags: device state flags
4478 * Change settings on device based state flags. The flags are
4479 * in the userspace exported format.
4481 int dev_change_flags(struct net_device *dev, unsigned flags)
4484 int old_flags = dev->flags;
4486 ret = __dev_change_flags(dev, flags);
4490 changes = old_flags ^ dev->flags;
4492 rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
4494 __dev_notify_flags(dev, old_flags);
4497 EXPORT_SYMBOL(dev_change_flags);
4500 * dev_set_mtu - Change maximum transfer unit
4502 * @new_mtu: new transfer unit
4504 * Change the maximum transfer size of the network device.
4506 int dev_set_mtu(struct net_device *dev, int new_mtu)
4508 const struct net_device_ops *ops = dev->netdev_ops;
4511 if (new_mtu == dev->mtu)
4514 /* MTU must be positive. */
4518 if (!netif_device_present(dev))
4522 if (ops->ndo_change_mtu)
4523 err = ops->ndo_change_mtu(dev, new_mtu);
4527 if (!err && dev->flags & IFF_UP)
4528 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
4531 EXPORT_SYMBOL(dev_set_mtu);
4534 * dev_set_mac_address - Change Media Access Control Address
4538 * Change the hardware (MAC) address of the device
4540 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
4542 const struct net_device_ops *ops = dev->netdev_ops;
4545 if (!ops->ndo_set_mac_address)
4547 if (sa->sa_family != dev->type)
4549 if (!netif_device_present(dev))
4551 err = ops->ndo_set_mac_address(dev, sa);
4553 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4556 EXPORT_SYMBOL(dev_set_mac_address);
4559 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
4561 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
4564 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
4570 case SIOCGIFFLAGS: /* Get interface flags */
4571 ifr->ifr_flags = (short) dev_get_flags(dev);
4574 case SIOCGIFMETRIC: /* Get the metric on the interface
4575 (currently unused) */
4576 ifr->ifr_metric = 0;
4579 case SIOCGIFMTU: /* Get the MTU of a device */
4580 ifr->ifr_mtu = dev->mtu;
4585 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
4587 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
4588 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4589 ifr->ifr_hwaddr.sa_family = dev->type;
4597 ifr->ifr_map.mem_start = dev->mem_start;
4598 ifr->ifr_map.mem_end = dev->mem_end;
4599 ifr->ifr_map.base_addr = dev->base_addr;
4600 ifr->ifr_map.irq = dev->irq;
4601 ifr->ifr_map.dma = dev->dma;
4602 ifr->ifr_map.port = dev->if_port;
4606 ifr->ifr_ifindex = dev->ifindex;
4610 ifr->ifr_qlen = dev->tx_queue_len;
4614 /* dev_ioctl() should ensure this case
4626 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
4628 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
4631 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
4632 const struct net_device_ops *ops;
4637 ops = dev->netdev_ops;
4640 case SIOCSIFFLAGS: /* Set interface flags */
4641 return dev_change_flags(dev, ifr->ifr_flags);
4643 case SIOCSIFMETRIC: /* Set the metric on the interface
4644 (currently unused) */
4647 case SIOCSIFMTU: /* Set the MTU of a device */
4648 return dev_set_mtu(dev, ifr->ifr_mtu);
4651 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
4653 case SIOCSIFHWBROADCAST:
4654 if (ifr->ifr_hwaddr.sa_family != dev->type)
4656 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
4657 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4658 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4662 if (ops->ndo_set_config) {
4663 if (!netif_device_present(dev))
4665 return ops->ndo_set_config(dev, &ifr->ifr_map);
4670 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
4671 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4673 if (!netif_device_present(dev))
4675 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
4678 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
4679 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4681 if (!netif_device_present(dev))
4683 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
4686 if (ifr->ifr_qlen < 0)
4688 dev->tx_queue_len = ifr->ifr_qlen;
4692 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
4693 return dev_change_name(dev, ifr->ifr_newname);
4696 * Unknown or private ioctl
4699 if ((cmd >= SIOCDEVPRIVATE &&
4700 cmd <= SIOCDEVPRIVATE + 15) ||
4701 cmd == SIOCBONDENSLAVE ||
4702 cmd == SIOCBONDRELEASE ||
4703 cmd == SIOCBONDSETHWADDR ||
4704 cmd == SIOCBONDSLAVEINFOQUERY ||
4705 cmd == SIOCBONDINFOQUERY ||
4706 cmd == SIOCBONDCHANGEACTIVE ||
4707 cmd == SIOCGMIIPHY ||
4708 cmd == SIOCGMIIREG ||
4709 cmd == SIOCSMIIREG ||
4710 cmd == SIOCBRADDIF ||
4711 cmd == SIOCBRDELIF ||
4712 cmd == SIOCSHWTSTAMP ||
4713 cmd == SIOCWANDEV) {
4715 if (ops->ndo_do_ioctl) {
4716 if (netif_device_present(dev))
4717 err = ops->ndo_do_ioctl(dev, ifr, cmd);
4729 * This function handles all "interface"-type I/O control requests. The actual
4730 * 'doing' part of this is dev_ifsioc above.
4734 * dev_ioctl - network device ioctl
4735 * @net: the applicable net namespace
4736 * @cmd: command to issue
4737 * @arg: pointer to a struct ifreq in user space
4739 * Issue ioctl functions to devices. This is normally called by the
4740 * user space syscall interfaces but can sometimes be useful for
4741 * other purposes. The return value is the return from the syscall if
4742 * positive or a negative errno code on error.
4745 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
4751 /* One special case: SIOCGIFCONF takes ifconf argument
4752 and requires shared lock, because it sleeps writing
4756 if (cmd == SIOCGIFCONF) {
4758 ret = dev_ifconf(net, (char __user *) arg);
4762 if (cmd == SIOCGIFNAME)
4763 return dev_ifname(net, (struct ifreq __user *)arg);
4765 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
4768 ifr.ifr_name[IFNAMSIZ-1] = 0;
4770 colon = strchr(ifr.ifr_name, ':');
4775 * See which interface the caller is talking about.
4780 * These ioctl calls:
4781 * - can be done by all.
4782 * - atomic and do not require locking.
4793 dev_load(net, ifr.ifr_name);
4795 ret = dev_ifsioc_locked(net, &ifr, cmd);
4800 if (copy_to_user(arg, &ifr,
4801 sizeof(struct ifreq)))
4807 dev_load(net, ifr.ifr_name);
4809 ret = dev_ethtool(net, &ifr);
4814 if (copy_to_user(arg, &ifr,
4815 sizeof(struct ifreq)))
4821 * These ioctl calls:
4822 * - require superuser power.
4823 * - require strict serialization.
4829 if (!capable(CAP_NET_ADMIN))
4831 dev_load(net, ifr.ifr_name);
4833 ret = dev_ifsioc(net, &ifr, cmd);
4838 if (copy_to_user(arg, &ifr,
4839 sizeof(struct ifreq)))
4845 * These ioctl calls:
4846 * - require superuser power.
4847 * - require strict serialization.
4848 * - do not return a value
4858 case SIOCSIFHWBROADCAST:
4861 case SIOCBONDENSLAVE:
4862 case SIOCBONDRELEASE:
4863 case SIOCBONDSETHWADDR:
4864 case SIOCBONDCHANGEACTIVE:
4868 if (!capable(CAP_NET_ADMIN))
4871 case SIOCBONDSLAVEINFOQUERY:
4872 case SIOCBONDINFOQUERY:
4873 dev_load(net, ifr.ifr_name);
4875 ret = dev_ifsioc(net, &ifr, cmd);
4880 /* Get the per device memory space. We can add this but
4881 * currently do not support it */
4883 /* Set the per device memory buffer space.
4884 * Not applicable in our case */
4889 * Unknown or private ioctl.
4892 if (cmd == SIOCWANDEV ||
4893 (cmd >= SIOCDEVPRIVATE &&
4894 cmd <= SIOCDEVPRIVATE + 15)) {
4895 dev_load(net, ifr.ifr_name);
4897 ret = dev_ifsioc(net, &ifr, cmd);
4899 if (!ret && copy_to_user(arg, &ifr,
4900 sizeof(struct ifreq)))
4904 /* Take care of Wireless Extensions */
4905 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
4906 return wext_handle_ioctl(net, &ifr, cmd, arg);
4913 * dev_new_index - allocate an ifindex
4914 * @net: the applicable net namespace
4916 * Returns a suitable unique value for a new device interface
4917 * number. The caller must hold the rtnl semaphore or the
4918 * dev_base_lock to be sure it remains unique.
4920 static int dev_new_index(struct net *net)
4926 if (!__dev_get_by_index(net, ifindex))
4931 /* Delayed registration/unregisteration */
4932 static LIST_HEAD(net_todo_list);
4934 static void net_set_todo(struct net_device *dev)
4936 list_add_tail(&dev->todo_list, &net_todo_list);
4939 static void rollback_registered_many(struct list_head *head)
4941 struct net_device *dev, *tmp;
4943 BUG_ON(dev_boot_phase);
4946 list_for_each_entry_safe(dev, tmp, head, unreg_list) {
4947 /* Some devices call without registering
4948 * for initialization unwind. Remove those
4949 * devices and proceed with the remaining.
4951 if (dev->reg_state == NETREG_UNINITIALIZED) {
4952 pr_debug("unregister_netdevice: device %s/%p never "
4953 "was registered\n", dev->name, dev);
4956 list_del(&dev->unreg_list);
4960 BUG_ON(dev->reg_state != NETREG_REGISTERED);
4962 /* If device is running, close it first. */
4965 /* And unlink it from device chain. */
4966 unlist_netdevice(dev);
4968 dev->reg_state = NETREG_UNREGISTERING;
4973 list_for_each_entry(dev, head, unreg_list) {
4974 /* Shutdown queueing discipline. */
4978 /* Notify protocols, that we are about to destroy
4979 this device. They should clean all the things.
4981 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
4983 if (!dev->rtnl_link_ops ||
4984 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
4985 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
4988 * Flush the unicast and multicast chains
4993 if (dev->netdev_ops->ndo_uninit)
4994 dev->netdev_ops->ndo_uninit(dev);
4996 /* Notifier chain MUST detach us from master device. */
4997 WARN_ON(dev->master);
4999 /* Remove entries from kobject tree */
5000 netdev_unregister_kobject(dev);
5003 /* Process any work delayed until the end of the batch */
5004 dev = list_first_entry(head, struct net_device, unreg_list);
5005 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
5009 list_for_each_entry(dev, head, unreg_list)
5013 static void rollback_registered(struct net_device *dev)
5017 list_add(&dev->unreg_list, &single);
5018 rollback_registered_many(&single);
5021 unsigned long netdev_fix_features(unsigned long features, const char *name)
5023 /* Fix illegal SG+CSUM combinations. */
5024 if ((features & NETIF_F_SG) &&
5025 !(features & NETIF_F_ALL_CSUM)) {
5027 printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no "
5028 "checksum feature.\n", name);
5029 features &= ~NETIF_F_SG;
5032 /* TSO requires that SG is present as well. */
5033 if ((features & NETIF_F_TSO) && !(features & NETIF_F_SG)) {
5035 printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no "
5036 "SG feature.\n", name);
5037 features &= ~NETIF_F_TSO;
5040 if (features & NETIF_F_UFO) {
5041 if (!(features & NETIF_F_GEN_CSUM)) {
5043 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
5044 "since no NETIF_F_HW_CSUM feature.\n",
5046 features &= ~NETIF_F_UFO;
5049 if (!(features & NETIF_F_SG)) {
5051 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
5052 "since no NETIF_F_SG feature.\n", name);
5053 features &= ~NETIF_F_UFO;
5059 EXPORT_SYMBOL(netdev_fix_features);
5062 * netif_stacked_transfer_operstate - transfer operstate
5063 * @rootdev: the root or lower level device to transfer state from
5064 * @dev: the device to transfer operstate to
5066 * Transfer operational state from root to device. This is normally
5067 * called when a stacking relationship exists between the root
5068 * device and the device(a leaf device).
5070 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
5071 struct net_device *dev)
5073 if (rootdev->operstate == IF_OPER_DORMANT)
5074 netif_dormant_on(dev);
5076 netif_dormant_off(dev);
5078 if (netif_carrier_ok(rootdev)) {
5079 if (!netif_carrier_ok(dev))
5080 netif_carrier_on(dev);
5082 if (netif_carrier_ok(dev))
5083 netif_carrier_off(dev);
5086 EXPORT_SYMBOL(netif_stacked_transfer_operstate);
5088 static int netif_alloc_rx_queues(struct net_device *dev)
5091 unsigned int i, count = dev->num_rx_queues;
5092 struct netdev_rx_queue *rx;
5096 rx = kcalloc(count, sizeof(struct netdev_rx_queue), GFP_KERNEL);
5098 pr_err("netdev: Unable to allocate %u rx queues.\n", count);
5103 for (i = 0; i < count; i++)
5109 static int netif_alloc_netdev_queues(struct net_device *dev)
5111 unsigned int count = dev->num_tx_queues;
5112 struct netdev_queue *tx;
5117 tx = kcalloc(count, sizeof(struct netdev_queue), GFP_KERNEL);
5119 pr_err("netdev: Unable to allocate %u tx queues.\n",
5125 for (i = 0; i < count; i++)
5131 static void netdev_init_one_queue(struct net_device *dev,
5132 struct netdev_queue *queue,
5135 /* Initialize queue lock */
5136 spin_lock_init(&queue->_xmit_lock);
5137 netdev_set_xmit_lockdep_class(&queue->_xmit_lock, dev->type);
5138 queue->xmit_lock_owner = -1;
5141 static void netdev_init_queues(struct net_device *dev)
5143 netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
5144 spin_lock_init(&dev->tx_global_lock);
5148 * register_netdevice - register a network device
5149 * @dev: device to register
5151 * Take a completed network device structure and add it to the kernel
5152 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5153 * chain. 0 is returned on success. A negative errno code is returned
5154 * on a failure to set up the device, or if the name is a duplicate.
5156 * Callers must hold the rtnl semaphore. You may want
5157 * register_netdev() instead of this.
5160 * The locking appears insufficient to guarantee two parallel registers
5161 * will not get the same name.
5164 int register_netdevice(struct net_device *dev)
5167 struct net *net = dev_net(dev);
5169 BUG_ON(dev_boot_phase);
5174 /* When net_device's are persistent, this will be fatal. */
5175 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
5178 spin_lock_init(&dev->addr_list_lock);
5179 netdev_set_addr_lockdep_class(dev);
5183 netdev_init_queues(dev);
5185 /* Init, if this function is available */
5186 if (dev->netdev_ops->ndo_init) {
5187 ret = dev->netdev_ops->ndo_init(dev);
5195 ret = dev_get_valid_name(dev, dev->name, 0);
5199 dev->ifindex = dev_new_index(net);
5200 if (dev->iflink == -1)
5201 dev->iflink = dev->ifindex;
5203 /* Fix illegal checksum combinations */
5204 if ((dev->features & NETIF_F_HW_CSUM) &&
5205 (dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5206 printk(KERN_NOTICE "%s: mixed HW and IP checksum settings.\n",
5208 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
5211 if ((dev->features & NETIF_F_NO_CSUM) &&
5212 (dev->features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5213 printk(KERN_NOTICE "%s: mixed no checksumming and other settings.\n",
5215 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
5218 dev->features = netdev_fix_features(dev->features, dev->name);
5220 /* Enable software GSO if SG is supported. */
5221 if (dev->features & NETIF_F_SG)
5222 dev->features |= NETIF_F_GSO;
5224 /* Enable GRO and NETIF_F_HIGHDMA for vlans by default,
5225 * vlan_dev_init() will do the dev->features check, so these features
5226 * are enabled only if supported by underlying device.
5228 dev->vlan_features |= (NETIF_F_GRO | NETIF_F_HIGHDMA);
5230 ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
5231 ret = notifier_to_errno(ret);
5235 ret = netdev_register_kobject(dev);
5238 dev->reg_state = NETREG_REGISTERED;
5241 * Default initial state at registry is that the
5242 * device is present.
5245 set_bit(__LINK_STATE_PRESENT, &dev->state);
5247 dev_init_scheduler(dev);
5249 list_netdevice(dev);
5251 /* Notify protocols, that a new device appeared. */
5252 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
5253 ret = notifier_to_errno(ret);
5255 rollback_registered(dev);
5256 dev->reg_state = NETREG_UNREGISTERED;
5259 * Prevent userspace races by waiting until the network
5260 * device is fully setup before sending notifications.
5262 if (!dev->rtnl_link_ops ||
5263 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
5264 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
5270 if (dev->netdev_ops->ndo_uninit)
5271 dev->netdev_ops->ndo_uninit(dev);
5274 EXPORT_SYMBOL(register_netdevice);
5277 * init_dummy_netdev - init a dummy network device for NAPI
5278 * @dev: device to init
5280 * This takes a network device structure and initialize the minimum
5281 * amount of fields so it can be used to schedule NAPI polls without
5282 * registering a full blown interface. This is to be used by drivers
5283 * that need to tie several hardware interfaces to a single NAPI
5284 * poll scheduler due to HW limitations.
5286 int init_dummy_netdev(struct net_device *dev)
5288 /* Clear everything. Note we don't initialize spinlocks
5289 * are they aren't supposed to be taken by any of the
5290 * NAPI code and this dummy netdev is supposed to be
5291 * only ever used for NAPI polls
5293 memset(dev, 0, sizeof(struct net_device));
5295 /* make sure we BUG if trying to hit standard
5296 * register/unregister code path
5298 dev->reg_state = NETREG_DUMMY;
5300 /* NAPI wants this */
5301 INIT_LIST_HEAD(&dev->napi_list);
5303 /* a dummy interface is started by default */
5304 set_bit(__LINK_STATE_PRESENT, &dev->state);
5305 set_bit(__LINK_STATE_START, &dev->state);
5307 /* Note : We dont allocate pcpu_refcnt for dummy devices,
5308 * because users of this 'device' dont need to change
5314 EXPORT_SYMBOL_GPL(init_dummy_netdev);
5318 * register_netdev - register a network device
5319 * @dev: device to register
5321 * Take a completed network device structure and add it to the kernel
5322 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5323 * chain. 0 is returned on success. A negative errno code is returned
5324 * on a failure to set up the device, or if the name is a duplicate.
5326 * This is a wrapper around register_netdevice that takes the rtnl semaphore
5327 * and expands the device name if you passed a format string to
5330 int register_netdev(struct net_device *dev)
5337 * If the name is a format string the caller wants us to do a
5340 if (strchr(dev->name, '%')) {
5341 err = dev_alloc_name(dev, dev->name);
5346 err = register_netdevice(dev);
5351 EXPORT_SYMBOL(register_netdev);
5353 int netdev_refcnt_read(const struct net_device *dev)
5357 for_each_possible_cpu(i)
5358 refcnt += *per_cpu_ptr(dev->pcpu_refcnt, i);
5361 EXPORT_SYMBOL(netdev_refcnt_read);
5364 * netdev_wait_allrefs - wait until all references are gone.
5366 * This is called when unregistering network devices.
5368 * Any protocol or device that holds a reference should register
5369 * for netdevice notification, and cleanup and put back the
5370 * reference if they receive an UNREGISTER event.
5371 * We can get stuck here if buggy protocols don't correctly
5374 static void netdev_wait_allrefs(struct net_device *dev)
5376 unsigned long rebroadcast_time, warning_time;
5379 linkwatch_forget_dev(dev);
5381 rebroadcast_time = warning_time = jiffies;
5382 refcnt = netdev_refcnt_read(dev);
5384 while (refcnt != 0) {
5385 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
5388 /* Rebroadcast unregister notification */
5389 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5390 /* don't resend NETDEV_UNREGISTER_BATCH, _BATCH users
5391 * should have already handle it the first time */
5393 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
5395 /* We must not have linkwatch events
5396 * pending on unregister. If this
5397 * happens, we simply run the queue
5398 * unscheduled, resulting in a noop
5401 linkwatch_run_queue();
5406 rebroadcast_time = jiffies;
5411 refcnt = netdev_refcnt_read(dev);
5413 if (time_after(jiffies, warning_time + 10 * HZ)) {
5414 printk(KERN_EMERG "unregister_netdevice: "
5415 "waiting for %s to become free. Usage "
5418 warning_time = jiffies;
5427 * register_netdevice(x1);
5428 * register_netdevice(x2);
5430 * unregister_netdevice(y1);
5431 * unregister_netdevice(y2);
5437 * We are invoked by rtnl_unlock().
5438 * This allows us to deal with problems:
5439 * 1) We can delete sysfs objects which invoke hotplug
5440 * without deadlocking with linkwatch via keventd.
5441 * 2) Since we run with the RTNL semaphore not held, we can sleep
5442 * safely in order to wait for the netdev refcnt to drop to zero.
5444 * We must not return until all unregister events added during
5445 * the interval the lock was held have been completed.
5447 void netdev_run_todo(void)
5449 struct list_head list;
5451 /* Snapshot list, allow later requests */
5452 list_replace_init(&net_todo_list, &list);
5456 while (!list_empty(&list)) {
5457 struct net_device *dev
5458 = list_first_entry(&list, struct net_device, todo_list);
5459 list_del(&dev->todo_list);
5461 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
5462 printk(KERN_ERR "network todo '%s' but state %d\n",
5463 dev->name, dev->reg_state);
5468 dev->reg_state = NETREG_UNREGISTERED;
5470 on_each_cpu(flush_backlog, dev, 1);
5472 netdev_wait_allrefs(dev);
5475 BUG_ON(netdev_refcnt_read(dev));
5476 WARN_ON(rcu_dereference_raw(dev->ip_ptr));
5477 WARN_ON(rcu_dereference_raw(dev->ip6_ptr));
5478 WARN_ON(dev->dn_ptr);
5480 if (dev->destructor)
5481 dev->destructor(dev);
5483 /* Free network device */
5484 kobject_put(&dev->dev.kobj);
5489 * dev_txq_stats_fold - fold tx_queues stats
5490 * @dev: device to get statistics from
5491 * @stats: struct rtnl_link_stats64 to hold results
5493 void dev_txq_stats_fold(const struct net_device *dev,
5494 struct rtnl_link_stats64 *stats)
5496 u64 tx_bytes = 0, tx_packets = 0, tx_dropped = 0;
5498 struct netdev_queue *txq;
5500 for (i = 0; i < dev->num_tx_queues; i++) {
5501 txq = netdev_get_tx_queue(dev, i);
5502 spin_lock_bh(&txq->_xmit_lock);
5503 tx_bytes += txq->tx_bytes;
5504 tx_packets += txq->tx_packets;
5505 tx_dropped += txq->tx_dropped;
5506 spin_unlock_bh(&txq->_xmit_lock);
5508 if (tx_bytes || tx_packets || tx_dropped) {
5509 stats->tx_bytes = tx_bytes;
5510 stats->tx_packets = tx_packets;
5511 stats->tx_dropped = tx_dropped;
5514 EXPORT_SYMBOL(dev_txq_stats_fold);
5516 /* Convert net_device_stats to rtnl_link_stats64. They have the same
5517 * fields in the same order, with only the type differing.
5519 static void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
5520 const struct net_device_stats *netdev_stats)
5522 #if BITS_PER_LONG == 64
5523 BUILD_BUG_ON(sizeof(*stats64) != sizeof(*netdev_stats));
5524 memcpy(stats64, netdev_stats, sizeof(*stats64));
5526 size_t i, n = sizeof(*stats64) / sizeof(u64);
5527 const unsigned long *src = (const unsigned long *)netdev_stats;
5528 u64 *dst = (u64 *)stats64;
5530 BUILD_BUG_ON(sizeof(*netdev_stats) / sizeof(unsigned long) !=
5531 sizeof(*stats64) / sizeof(u64));
5532 for (i = 0; i < n; i++)
5538 * dev_get_stats - get network device statistics
5539 * @dev: device to get statistics from
5540 * @storage: place to store stats
5542 * Get network statistics from device. Return @storage.
5543 * The device driver may provide its own method by setting
5544 * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
5545 * otherwise the internal statistics structure is used.
5547 struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
5548 struct rtnl_link_stats64 *storage)
5550 const struct net_device_ops *ops = dev->netdev_ops;
5552 if (ops->ndo_get_stats64) {
5553 memset(storage, 0, sizeof(*storage));
5554 ops->ndo_get_stats64(dev, storage);
5555 } else if (ops->ndo_get_stats) {
5556 netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev));
5558 netdev_stats_to_stats64(storage, &dev->stats);
5559 dev_txq_stats_fold(dev, storage);
5561 storage->rx_dropped += atomic_long_read(&dev->rx_dropped);
5564 EXPORT_SYMBOL(dev_get_stats);
5566 struct netdev_queue *dev_ingress_queue_create(struct net_device *dev)
5568 struct netdev_queue *queue = dev_ingress_queue(dev);
5570 #ifdef CONFIG_NET_CLS_ACT
5573 queue = kzalloc(sizeof(*queue), GFP_KERNEL);
5576 netdev_init_one_queue(dev, queue, NULL);
5577 queue->qdisc = &noop_qdisc;
5578 queue->qdisc_sleeping = &noop_qdisc;
5579 rcu_assign_pointer(dev->ingress_queue, queue);
5585 * alloc_netdev_mq - allocate network device
5586 * @sizeof_priv: size of private data to allocate space for
5587 * @name: device name format string
5588 * @setup: callback to initialize device
5589 * @queue_count: the number of subqueues to allocate
5591 * Allocates a struct net_device with private data area for driver use
5592 * and performs basic initialization. Also allocates subquue structs
5593 * for each queue on the device at the end of the netdevice.
5595 struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
5596 void (*setup)(struct net_device *), unsigned int queue_count)
5598 struct net_device *dev;
5600 struct net_device *p;
5602 BUG_ON(strlen(name) >= sizeof(dev->name));
5604 if (queue_count < 1) {
5605 pr_err("alloc_netdev: Unable to allocate device "
5606 "with zero queues.\n");
5610 alloc_size = sizeof(struct net_device);
5612 /* ensure 32-byte alignment of private area */
5613 alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
5614 alloc_size += sizeof_priv;
5616 /* ensure 32-byte alignment of whole construct */
5617 alloc_size += NETDEV_ALIGN - 1;
5619 p = kzalloc(alloc_size, GFP_KERNEL);
5621 printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
5625 dev = PTR_ALIGN(p, NETDEV_ALIGN);
5626 dev->padded = (char *)dev - (char *)p;
5628 dev->pcpu_refcnt = alloc_percpu(int);
5629 if (!dev->pcpu_refcnt)
5632 if (dev_addr_init(dev))
5638 dev_net_set(dev, &init_net);
5640 dev->num_tx_queues = queue_count;
5641 dev->real_num_tx_queues = queue_count;
5642 if (netif_alloc_netdev_queues(dev))
5646 dev->num_rx_queues = queue_count;
5647 dev->real_num_rx_queues = queue_count;
5648 if (netif_alloc_rx_queues(dev))
5652 dev->gso_max_size = GSO_MAX_SIZE;
5654 INIT_LIST_HEAD(&dev->ethtool_ntuple_list.list);
5655 dev->ethtool_ntuple_list.count = 0;
5656 INIT_LIST_HEAD(&dev->napi_list);
5657 INIT_LIST_HEAD(&dev->unreg_list);
5658 INIT_LIST_HEAD(&dev->link_watch_list);
5659 dev->priv_flags = IFF_XMIT_DST_RELEASE;
5661 strcpy(dev->name, name);
5665 free_percpu(dev->pcpu_refcnt);
5675 EXPORT_SYMBOL(alloc_netdev_mq);
5678 * free_netdev - free network device
5681 * This function does the last stage of destroying an allocated device
5682 * interface. The reference to the device object is released.
5683 * If this is the last reference then it will be freed.
5685 void free_netdev(struct net_device *dev)
5687 struct napi_struct *p, *n;
5689 release_net(dev_net(dev));
5696 kfree(rcu_dereference_raw(dev->ingress_queue));
5698 /* Flush device addresses */
5699 dev_addr_flush(dev);
5701 /* Clear ethtool n-tuple list */
5702 ethtool_ntuple_flush(dev);
5704 list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
5707 free_percpu(dev->pcpu_refcnt);
5708 dev->pcpu_refcnt = NULL;
5710 /* Compatibility with error handling in drivers */
5711 if (dev->reg_state == NETREG_UNINITIALIZED) {
5712 kfree((char *)dev - dev->padded);
5716 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
5717 dev->reg_state = NETREG_RELEASED;
5719 /* will free via device release */
5720 put_device(&dev->dev);
5722 EXPORT_SYMBOL(free_netdev);
5725 * synchronize_net - Synchronize with packet receive processing
5727 * Wait for packets currently being received to be done.
5728 * Does not block later packets from starting.
5730 void synchronize_net(void)
5735 EXPORT_SYMBOL(synchronize_net);
5738 * unregister_netdevice_queue - remove device from the kernel
5742 * This function shuts down a device interface and removes it
5743 * from the kernel tables.
5744 * If head not NULL, device is queued to be unregistered later.
5746 * Callers must hold the rtnl semaphore. You may want
5747 * unregister_netdev() instead of this.
5750 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
5755 list_move_tail(&dev->unreg_list, head);
5757 rollback_registered(dev);
5758 /* Finish processing unregister after unlock */
5762 EXPORT_SYMBOL(unregister_netdevice_queue);
5765 * unregister_netdevice_many - unregister many devices
5766 * @head: list of devices
5768 void unregister_netdevice_many(struct list_head *head)
5770 struct net_device *dev;
5772 if (!list_empty(head)) {
5773 rollback_registered_many(head);
5774 list_for_each_entry(dev, head, unreg_list)
5778 EXPORT_SYMBOL(unregister_netdevice_many);
5781 * unregister_netdev - remove device from the kernel
5784 * This function shuts down a device interface and removes it
5785 * from the kernel tables.
5787 * This is just a wrapper for unregister_netdevice that takes
5788 * the rtnl semaphore. In general you want to use this and not
5789 * unregister_netdevice.
5791 void unregister_netdev(struct net_device *dev)
5794 unregister_netdevice(dev);
5797 EXPORT_SYMBOL(unregister_netdev);
5800 * dev_change_net_namespace - move device to different nethost namespace
5802 * @net: network namespace
5803 * @pat: If not NULL name pattern to try if the current device name
5804 * is already taken in the destination network namespace.
5806 * This function shuts down a device interface and moves it
5807 * to a new network namespace. On success 0 is returned, on
5808 * a failure a netagive errno code is returned.
5810 * Callers must hold the rtnl semaphore.
5813 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
5819 /* Don't allow namespace local devices to be moved. */
5821 if (dev->features & NETIF_F_NETNS_LOCAL)
5824 /* Ensure the device has been registrered */
5826 if (dev->reg_state != NETREG_REGISTERED)
5829 /* Get out if there is nothing todo */
5831 if (net_eq(dev_net(dev), net))
5834 /* Pick the destination device name, and ensure
5835 * we can use it in the destination network namespace.
5838 if (__dev_get_by_name(net, dev->name)) {
5839 /* We get here if we can't use the current device name */
5842 if (dev_get_valid_name(dev, pat, 1))
5847 * And now a mini version of register_netdevice unregister_netdevice.
5850 /* If device is running close it first. */
5853 /* And unlink it from device chain */
5855 unlist_netdevice(dev);
5859 /* Shutdown queueing discipline. */
5862 /* Notify protocols, that we are about to destroy
5863 this device. They should clean all the things.
5865 Note that dev->reg_state stays at NETREG_REGISTERED.
5866 This is wanted because this way 8021q and macvlan know
5867 the device is just moving and can keep their slaves up.
5869 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5870 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
5873 * Flush the unicast and multicast chains
5878 /* Actually switch the network namespace */
5879 dev_net_set(dev, net);
5881 /* If there is an ifindex conflict assign a new one */
5882 if (__dev_get_by_index(net, dev->ifindex)) {
5883 int iflink = (dev->iflink == dev->ifindex);
5884 dev->ifindex = dev_new_index(net);
5886 dev->iflink = dev->ifindex;
5889 /* Fixup kobjects */
5890 err = device_rename(&dev->dev, dev->name);
5893 /* Add the device back in the hashes */
5894 list_netdevice(dev);
5896 /* Notify protocols, that a new device appeared. */
5897 call_netdevice_notifiers(NETDEV_REGISTER, dev);
5900 * Prevent userspace races by waiting until the network
5901 * device is fully setup before sending notifications.
5903 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
5910 EXPORT_SYMBOL_GPL(dev_change_net_namespace);
5912 static int dev_cpu_callback(struct notifier_block *nfb,
5913 unsigned long action,
5916 struct sk_buff **list_skb;
5917 struct sk_buff *skb;
5918 unsigned int cpu, oldcpu = (unsigned long)ocpu;
5919 struct softnet_data *sd, *oldsd;
5921 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
5924 local_irq_disable();
5925 cpu = smp_processor_id();
5926 sd = &per_cpu(softnet_data, cpu);
5927 oldsd = &per_cpu(softnet_data, oldcpu);
5929 /* Find end of our completion_queue. */
5930 list_skb = &sd->completion_queue;
5932 list_skb = &(*list_skb)->next;
5933 /* Append completion queue from offline CPU. */
5934 *list_skb = oldsd->completion_queue;
5935 oldsd->completion_queue = NULL;
5937 /* Append output queue from offline CPU. */
5938 if (oldsd->output_queue) {
5939 *sd->output_queue_tailp = oldsd->output_queue;
5940 sd->output_queue_tailp = oldsd->output_queue_tailp;
5941 oldsd->output_queue = NULL;
5942 oldsd->output_queue_tailp = &oldsd->output_queue;
5945 raise_softirq_irqoff(NET_TX_SOFTIRQ);
5948 /* Process offline CPU's input_pkt_queue */
5949 while ((skb = __skb_dequeue(&oldsd->process_queue))) {
5951 input_queue_head_incr(oldsd);
5953 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) {
5955 input_queue_head_incr(oldsd);
5963 * netdev_increment_features - increment feature set by one
5964 * @all: current feature set
5965 * @one: new feature set
5966 * @mask: mask feature set
5968 * Computes a new feature set after adding a device with feature set
5969 * @one to the master device with current feature set @all. Will not
5970 * enable anything that is off in @mask. Returns the new feature set.
5972 unsigned long netdev_increment_features(unsigned long all, unsigned long one,
5975 /* If device needs checksumming, downgrade to it. */
5976 if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM))
5977 all ^= NETIF_F_NO_CSUM | (one & NETIF_F_ALL_CSUM);
5978 else if (mask & NETIF_F_ALL_CSUM) {
5979 /* If one device supports v4/v6 checksumming, set for all. */
5980 if (one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM) &&
5981 !(all & NETIF_F_GEN_CSUM)) {
5982 all &= ~NETIF_F_ALL_CSUM;
5983 all |= one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
5986 /* If one device supports hw checksumming, set for all. */
5987 if (one & NETIF_F_GEN_CSUM && !(all & NETIF_F_GEN_CSUM)) {
5988 all &= ~NETIF_F_ALL_CSUM;
5989 all |= NETIF_F_HW_CSUM;
5993 one |= NETIF_F_ALL_CSUM;
5995 one |= all & NETIF_F_ONE_FOR_ALL;
5996 all &= one | NETIF_F_LLTX | NETIF_F_GSO | NETIF_F_UFO;
5997 all |= one & mask & NETIF_F_ONE_FOR_ALL;
6001 EXPORT_SYMBOL(netdev_increment_features);
6003 static struct hlist_head *netdev_create_hash(void)
6006 struct hlist_head *hash;
6008 hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
6010 for (i = 0; i < NETDEV_HASHENTRIES; i++)
6011 INIT_HLIST_HEAD(&hash[i]);
6016 /* Initialize per network namespace state */
6017 static int __net_init netdev_init(struct net *net)
6019 INIT_LIST_HEAD(&net->dev_base_head);
6021 net->dev_name_head = netdev_create_hash();
6022 if (net->dev_name_head == NULL)
6025 net->dev_index_head = netdev_create_hash();
6026 if (net->dev_index_head == NULL)
6032 kfree(net->dev_name_head);
6038 * netdev_drivername - network driver for the device
6039 * @dev: network device
6040 * @buffer: buffer for resulting name
6041 * @len: size of buffer
6043 * Determine network driver for device.
6045 char *netdev_drivername(const struct net_device *dev, char *buffer, int len)
6047 const struct device_driver *driver;
6048 const struct device *parent;
6050 if (len <= 0 || !buffer)
6054 parent = dev->dev.parent;
6059 driver = parent->driver;
6060 if (driver && driver->name)
6061 strlcpy(buffer, driver->name, len);
6065 static int __netdev_printk(const char *level, const struct net_device *dev,
6066 struct va_format *vaf)
6070 if (dev && dev->dev.parent)
6071 r = dev_printk(level, dev->dev.parent, "%s: %pV",
6072 netdev_name(dev), vaf);
6074 r = printk("%s%s: %pV", level, netdev_name(dev), vaf);
6076 r = printk("%s(NULL net_device): %pV", level, vaf);
6081 int netdev_printk(const char *level, const struct net_device *dev,
6082 const char *format, ...)
6084 struct va_format vaf;
6088 va_start(args, format);
6093 r = __netdev_printk(level, dev, &vaf);
6098 EXPORT_SYMBOL(netdev_printk);
6100 #define define_netdev_printk_level(func, level) \
6101 int func(const struct net_device *dev, const char *fmt, ...) \
6104 struct va_format vaf; \
6107 va_start(args, fmt); \
6112 r = __netdev_printk(level, dev, &vaf); \
6117 EXPORT_SYMBOL(func);
6119 define_netdev_printk_level(netdev_emerg, KERN_EMERG);
6120 define_netdev_printk_level(netdev_alert, KERN_ALERT);
6121 define_netdev_printk_level(netdev_crit, KERN_CRIT);
6122 define_netdev_printk_level(netdev_err, KERN_ERR);
6123 define_netdev_printk_level(netdev_warn, KERN_WARNING);
6124 define_netdev_printk_level(netdev_notice, KERN_NOTICE);
6125 define_netdev_printk_level(netdev_info, KERN_INFO);
6127 static void __net_exit netdev_exit(struct net *net)
6129 kfree(net->dev_name_head);
6130 kfree(net->dev_index_head);
6133 static struct pernet_operations __net_initdata netdev_net_ops = {
6134 .init = netdev_init,
6135 .exit = netdev_exit,
6138 static void __net_exit default_device_exit(struct net *net)
6140 struct net_device *dev, *aux;
6142 * Push all migratable network devices back to the
6143 * initial network namespace
6146 for_each_netdev_safe(net, dev, aux) {
6148 char fb_name[IFNAMSIZ];
6150 /* Ignore unmoveable devices (i.e. loopback) */
6151 if (dev->features & NETIF_F_NETNS_LOCAL)
6154 /* Leave virtual devices for the generic cleanup */
6155 if (dev->rtnl_link_ops)
6158 /* Push remaing network devices to init_net */
6159 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
6160 err = dev_change_net_namespace(dev, &init_net, fb_name);
6162 printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
6163 __func__, dev->name, err);
6170 static void __net_exit default_device_exit_batch(struct list_head *net_list)
6172 /* At exit all network devices most be removed from a network
6173 * namespace. Do this in the reverse order of registeration.
6174 * Do this across as many network namespaces as possible to
6175 * improve batching efficiency.
6177 struct net_device *dev;
6179 LIST_HEAD(dev_kill_list);
6182 list_for_each_entry(net, net_list, exit_list) {
6183 for_each_netdev_reverse(net, dev) {
6184 if (dev->rtnl_link_ops)
6185 dev->rtnl_link_ops->dellink(dev, &dev_kill_list);
6187 unregister_netdevice_queue(dev, &dev_kill_list);
6190 unregister_netdevice_many(&dev_kill_list);
6194 static struct pernet_operations __net_initdata default_device_ops = {
6195 .exit = default_device_exit,
6196 .exit_batch = default_device_exit_batch,
6200 * Initialize the DEV module. At boot time this walks the device list and
6201 * unhooks any devices that fail to initialise (normally hardware not
6202 * present) and leaves us with a valid list of present and active devices.
6207 * This is called single threaded during boot, so no need
6208 * to take the rtnl semaphore.
6210 static int __init net_dev_init(void)
6212 int i, rc = -ENOMEM;
6214 BUG_ON(!dev_boot_phase);
6216 if (dev_proc_init())
6219 if (netdev_kobject_init())
6222 INIT_LIST_HEAD(&ptype_all);
6223 for (i = 0; i < PTYPE_HASH_SIZE; i++)
6224 INIT_LIST_HEAD(&ptype_base[i]);
6226 if (register_pernet_subsys(&netdev_net_ops))
6230 * Initialise the packet receive queues.
6233 for_each_possible_cpu(i) {
6234 struct softnet_data *sd = &per_cpu(softnet_data, i);
6236 memset(sd, 0, sizeof(*sd));
6237 skb_queue_head_init(&sd->input_pkt_queue);
6238 skb_queue_head_init(&sd->process_queue);
6239 sd->completion_queue = NULL;
6240 INIT_LIST_HEAD(&sd->poll_list);
6241 sd->output_queue = NULL;
6242 sd->output_queue_tailp = &sd->output_queue;
6244 sd->csd.func = rps_trigger_softirq;
6250 sd->backlog.poll = process_backlog;
6251 sd->backlog.weight = weight_p;
6252 sd->backlog.gro_list = NULL;
6253 sd->backlog.gro_count = 0;
6258 /* The loopback device is special if any other network devices
6259 * is present in a network namespace the loopback device must
6260 * be present. Since we now dynamically allocate and free the
6261 * loopback device ensure this invariant is maintained by
6262 * keeping the loopback device as the first device on the
6263 * list of network devices. Ensuring the loopback devices
6264 * is the first device that appears and the last network device
6267 if (register_pernet_device(&loopback_net_ops))
6270 if (register_pernet_device(&default_device_ops))
6273 open_softirq(NET_TX_SOFTIRQ, net_tx_action);
6274 open_softirq(NET_RX_SOFTIRQ, net_rx_action);
6276 hotcpu_notifier(dev_cpu_callback, 0);
6284 subsys_initcall(net_dev_init);
6286 static int __init initialize_hashrnd(void)
6288 get_random_bytes(&hashrnd, sizeof(hashrnd));
6292 late_initcall_sync(initialize_hashrnd);