2 * NET3 Protocol independent device support routines.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
9 * Derived from the non IP parts of dev.c 1.0.19
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Mark Evans, <evansmp@uhura.aston.ac.uk>
15 * Florian la Roche <rzsfl@rz.uni-sb.de>
16 * Alan Cox <gw4pts@gw4pts.ampr.org>
17 * David Hinds <dahinds@users.sourceforge.net>
18 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
19 * Adam Sulmicki <adam@cfar.umd.edu>
20 * Pekka Riikonen <priikone@poesidon.pspt.fi>
23 * D.J. Barrow : Fixed bug where dev->refcnt gets set
24 * to 2 if register_netdev gets called
25 * before net_dev_init & also removed a
26 * few lines of code in the process.
27 * Alan Cox : device private ioctl copies fields back.
28 * Alan Cox : Transmit queue code does relevant
29 * stunts to keep the queue safe.
30 * Alan Cox : Fixed double lock.
31 * Alan Cox : Fixed promisc NULL pointer trap
32 * ???????? : Support the full private ioctl range
33 * Alan Cox : Moved ioctl permission check into
35 * Tim Kordas : SIOCADDMULTI/SIOCDELMULTI
36 * Alan Cox : 100 backlog just doesn't cut it when
37 * you start doing multicast video 8)
38 * Alan Cox : Rewrote net_bh and list manager.
39 * Alan Cox : Fix ETH_P_ALL echoback lengths.
40 * Alan Cox : Took out transmit every packet pass
41 * Saved a few bytes in the ioctl handler
42 * Alan Cox : Network driver sets packet type before
43 * calling netif_rx. Saves a function
45 * Alan Cox : Hashed net_bh()
46 * Richard Kooijman: Timestamp fixes.
47 * Alan Cox : Wrong field in SIOCGIFDSTADDR
48 * Alan Cox : Device lock protection.
49 * Alan Cox : Fixed nasty side effect of device close
51 * Rudi Cilibrasi : Pass the right thing to
53 * Dave Miller : 32bit quantity for the device lock to
54 * make it work out on a Sparc.
55 * Bjorn Ekwall : Added KERNELD hack.
56 * Alan Cox : Cleaned up the backlog initialise.
57 * Craig Metz : SIOCGIFCONF fix if space for under
59 * Thomas Bogendoerfer : Return ENODEV for dev_open, if there
60 * is no device open function.
61 * Andi Kleen : Fix error reporting for SIOCGIFCONF
62 * Michael Chastain : Fix signed/unsigned for SIOCGIFCONF
63 * Cyrus Durgin : Cleaned for KMOD
64 * Adam Sulmicki : Bug Fix : Network Device Unload
65 * A network device unload needs to purge
67 * Paul Rusty Russell : SIOCSIFNAME
68 * Pekka Riikonen : Netdev boot-time settings code
69 * Andrew Morton : Make unregister_netdevice wait
70 * indefinitely on dev->refcnt
71 * J Hadi Salim : - Backlog queue sampling
72 * - netif_rx() feedback
75 #include <asm/uaccess.h>
76 #include <asm/system.h>
77 #include <linux/bitops.h>
78 #include <linux/capability.h>
79 #include <linux/cpu.h>
80 #include <linux/types.h>
81 #include <linux/kernel.h>
82 #include <linux/hash.h>
83 #include <linux/slab.h>
84 #include <linux/sched.h>
85 #include <linux/mutex.h>
86 #include <linux/string.h>
88 #include <linux/socket.h>
89 #include <linux/sockios.h>
90 #include <linux/errno.h>
91 #include <linux/interrupt.h>
92 #include <linux/if_ether.h>
93 #include <linux/netdevice.h>
94 #include <linux/etherdevice.h>
95 #include <linux/ethtool.h>
96 #include <linux/notifier.h>
97 #include <linux/skbuff.h>
98 #include <net/net_namespace.h>
100 #include <linux/rtnetlink.h>
101 #include <linux/proc_fs.h>
102 #include <linux/seq_file.h>
103 #include <linux/stat.h>
105 #include <net/pkt_sched.h>
106 #include <net/checksum.h>
107 #include <net/xfrm.h>
108 #include <linux/highmem.h>
109 #include <linux/init.h>
110 #include <linux/kmod.h>
111 #include <linux/module.h>
112 #include <linux/netpoll.h>
113 #include <linux/rcupdate.h>
114 #include <linux/delay.h>
115 #include <net/wext.h>
116 #include <net/iw_handler.h>
117 #include <asm/current.h>
118 #include <linux/audit.h>
119 #include <linux/dmaengine.h>
120 #include <linux/err.h>
121 #include <linux/ctype.h>
122 #include <linux/if_arp.h>
123 #include <linux/if_vlan.h>
124 #include <linux/ip.h>
126 #include <linux/ipv6.h>
127 #include <linux/in.h>
128 #include <linux/jhash.h>
129 #include <linux/random.h>
130 #include <trace/events/napi.h>
131 #include <trace/events/net.h>
132 #include <trace/events/skb.h>
133 #include <linux/pci.h>
134 #include <linux/inetdevice.h>
135 #include <linux/cpu_rmap.h>
137 #include "net-sysfs.h"
139 /* Instead of increasing this, you should create a hash table. */
140 #define MAX_GRO_SKBS 8
142 /* This should be increased if a protocol with a bigger head is added. */
143 #define GRO_MAX_HEAD (MAX_HEADER + 128)
146 * The list of packet types we will receive (as opposed to discard)
147 * and the routines to invoke.
149 * Why 16. Because with 16 the only overlap we get on a hash of the
150 * low nibble of the protocol value is RARP/SNAP/X.25.
152 * NOTE: That is no longer true with the addition of VLAN tags. Not
153 * sure which should go first, but I bet it won't make much
154 * difference if we are running VLANs. The good news is that
155 * this protocol won't be in the list unless compiled in, so
156 * the average user (w/out VLANs) will not be adversely affected.
173 #define PTYPE_HASH_SIZE (16)
174 #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1)
176 static DEFINE_SPINLOCK(ptype_lock);
177 static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
178 static struct list_head ptype_all __read_mostly; /* Taps */
181 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
184 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
186 * Writers must hold the rtnl semaphore while they loop through the
187 * dev_base_head list, and hold dev_base_lock for writing when they do the
188 * actual updates. This allows pure readers to access the list even
189 * while a writer is preparing to update it.
191 * To put it another way, dev_base_lock is held for writing only to
192 * protect against pure readers; the rtnl semaphore provides the
193 * protection against other writers.
195 * See, for example usages, register_netdevice() and
196 * unregister_netdevice(), which must be called with the rtnl
199 DEFINE_RWLOCK(dev_base_lock);
200 EXPORT_SYMBOL(dev_base_lock);
202 static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
204 unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
205 return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)];
208 static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
210 return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)];
213 static inline void rps_lock(struct softnet_data *sd)
216 spin_lock(&sd->input_pkt_queue.lock);
220 static inline void rps_unlock(struct softnet_data *sd)
223 spin_unlock(&sd->input_pkt_queue.lock);
227 /* Device list insertion */
228 static int list_netdevice(struct net_device *dev)
230 struct net *net = dev_net(dev);
234 write_lock_bh(&dev_base_lock);
235 list_add_tail_rcu(&dev->dev_list, &net->dev_base_head);
236 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
237 hlist_add_head_rcu(&dev->index_hlist,
238 dev_index_hash(net, dev->ifindex));
239 write_unlock_bh(&dev_base_lock);
243 /* Device list removal
244 * caller must respect a RCU grace period before freeing/reusing dev
246 static void unlist_netdevice(struct net_device *dev)
250 /* Unlink dev from the device chain */
251 write_lock_bh(&dev_base_lock);
252 list_del_rcu(&dev->dev_list);
253 hlist_del_rcu(&dev->name_hlist);
254 hlist_del_rcu(&dev->index_hlist);
255 write_unlock_bh(&dev_base_lock);
262 static RAW_NOTIFIER_HEAD(netdev_chain);
265 * Device drivers call our routines to queue packets here. We empty the
266 * queue in the local softnet handler.
269 DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
270 EXPORT_PER_CPU_SYMBOL(softnet_data);
272 #ifdef CONFIG_LOCKDEP
274 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
275 * according to dev->type
277 static const unsigned short netdev_lock_type[] =
278 {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
279 ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
280 ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
281 ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
282 ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
283 ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
284 ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
285 ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
286 ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
287 ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
288 ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
289 ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
290 ARPHRD_FCFABRIC, ARPHRD_IEEE802_TR, ARPHRD_IEEE80211,
291 ARPHRD_IEEE80211_PRISM, ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET,
292 ARPHRD_PHONET_PIPE, ARPHRD_IEEE802154,
293 ARPHRD_VOID, ARPHRD_NONE};
295 static const char *const netdev_lock_name[] =
296 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
297 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
298 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
299 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
300 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
301 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
302 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
303 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
304 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
305 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
306 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
307 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
308 "_xmit_FCFABRIC", "_xmit_IEEE802_TR", "_xmit_IEEE80211",
309 "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET",
310 "_xmit_PHONET_PIPE", "_xmit_IEEE802154",
311 "_xmit_VOID", "_xmit_NONE"};
313 static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
314 static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)];
316 static inline unsigned short netdev_lock_pos(unsigned short dev_type)
320 for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++)
321 if (netdev_lock_type[i] == dev_type)
323 /* the last key is used by default */
324 return ARRAY_SIZE(netdev_lock_type) - 1;
327 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
328 unsigned short dev_type)
332 i = netdev_lock_pos(dev_type);
333 lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
334 netdev_lock_name[i]);
337 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
341 i = netdev_lock_pos(dev->type);
342 lockdep_set_class_and_name(&dev->addr_list_lock,
343 &netdev_addr_lock_key[i],
344 netdev_lock_name[i]);
347 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
348 unsigned short dev_type)
351 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
356 /*******************************************************************************
358 Protocol management and registration routines
360 *******************************************************************************/
363 * Add a protocol ID to the list. Now that the input handler is
364 * smarter we can dispense with all the messy stuff that used to be
367 * BEWARE!!! Protocol handlers, mangling input packets,
368 * MUST BE last in hash buckets and checking protocol handlers
369 * MUST start from promiscuous ptype_all chain in net_bh.
370 * It is true now, do not change it.
371 * Explanation follows: if protocol handler, mangling packet, will
372 * be the first on list, it is not able to sense, that packet
373 * is cloned and should be copied-on-write, so that it will
374 * change it and subsequent readers will get broken packet.
378 static inline struct list_head *ptype_head(const struct packet_type *pt)
380 if (pt->type == htons(ETH_P_ALL))
383 return &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
387 * dev_add_pack - add packet handler
388 * @pt: packet type declaration
390 * Add a protocol handler to the networking stack. The passed &packet_type
391 * is linked into kernel lists and may not be freed until it has been
392 * removed from the kernel lists.
394 * This call does not sleep therefore it can not
395 * guarantee all CPU's that are in middle of receiving packets
396 * will see the new packet type (until the next received packet).
399 void dev_add_pack(struct packet_type *pt)
401 struct list_head *head = ptype_head(pt);
403 spin_lock(&ptype_lock);
404 list_add_rcu(&pt->list, head);
405 spin_unlock(&ptype_lock);
407 EXPORT_SYMBOL(dev_add_pack);
410 * __dev_remove_pack - remove packet handler
411 * @pt: packet type declaration
413 * Remove a protocol handler that was previously added to the kernel
414 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
415 * from the kernel lists and can be freed or reused once this function
418 * The packet type might still be in use by receivers
419 * and must not be freed until after all the CPU's have gone
420 * through a quiescent state.
422 void __dev_remove_pack(struct packet_type *pt)
424 struct list_head *head = ptype_head(pt);
425 struct packet_type *pt1;
427 spin_lock(&ptype_lock);
429 list_for_each_entry(pt1, head, list) {
431 list_del_rcu(&pt->list);
436 printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt);
438 spin_unlock(&ptype_lock);
440 EXPORT_SYMBOL(__dev_remove_pack);
443 * dev_remove_pack - remove packet handler
444 * @pt: packet type declaration
446 * Remove a protocol handler that was previously added to the kernel
447 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
448 * from the kernel lists and can be freed or reused once this function
451 * This call sleeps to guarantee that no CPU is looking at the packet
454 void dev_remove_pack(struct packet_type *pt)
456 __dev_remove_pack(pt);
460 EXPORT_SYMBOL(dev_remove_pack);
462 /******************************************************************************
464 Device Boot-time Settings Routines
466 *******************************************************************************/
468 /* Boot time configuration table */
469 static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
472 * netdev_boot_setup_add - add new setup entry
473 * @name: name of the device
474 * @map: configured settings for the device
476 * Adds new setup entry to the dev_boot_setup list. The function
477 * returns 0 on error and 1 on success. This is a generic routine to
480 static int netdev_boot_setup_add(char *name, struct ifmap *map)
482 struct netdev_boot_setup *s;
486 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
487 if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
488 memset(s[i].name, 0, sizeof(s[i].name));
489 strlcpy(s[i].name, name, IFNAMSIZ);
490 memcpy(&s[i].map, map, sizeof(s[i].map));
495 return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
499 * netdev_boot_setup_check - check boot time settings
500 * @dev: the netdevice
502 * Check boot time settings for the device.
503 * The found settings are set for the device to be used
504 * later in the device probing.
505 * Returns 0 if no settings found, 1 if they are.
507 int netdev_boot_setup_check(struct net_device *dev)
509 struct netdev_boot_setup *s = dev_boot_setup;
512 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
513 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
514 !strcmp(dev->name, s[i].name)) {
515 dev->irq = s[i].map.irq;
516 dev->base_addr = s[i].map.base_addr;
517 dev->mem_start = s[i].map.mem_start;
518 dev->mem_end = s[i].map.mem_end;
524 EXPORT_SYMBOL(netdev_boot_setup_check);
528 * netdev_boot_base - get address from boot time settings
529 * @prefix: prefix for network device
530 * @unit: id for network device
532 * Check boot time settings for the base address of device.
533 * The found settings are set for the device to be used
534 * later in the device probing.
535 * Returns 0 if no settings found.
537 unsigned long netdev_boot_base(const char *prefix, int unit)
539 const struct netdev_boot_setup *s = dev_boot_setup;
543 sprintf(name, "%s%d", prefix, unit);
546 * If device already registered then return base of 1
547 * to indicate not to probe for this interface
549 if (__dev_get_by_name(&init_net, name))
552 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
553 if (!strcmp(name, s[i].name))
554 return s[i].map.base_addr;
559 * Saves at boot time configured settings for any netdevice.
561 int __init netdev_boot_setup(char *str)
566 str = get_options(str, ARRAY_SIZE(ints), ints);
571 memset(&map, 0, sizeof(map));
575 map.base_addr = ints[2];
577 map.mem_start = ints[3];
579 map.mem_end = ints[4];
581 /* Add new entry to the list */
582 return netdev_boot_setup_add(str, &map);
585 __setup("netdev=", netdev_boot_setup);
587 /*******************************************************************************
589 Device Interface Subroutines
591 *******************************************************************************/
594 * __dev_get_by_name - find a device by its name
595 * @net: the applicable net namespace
596 * @name: name to find
598 * Find an interface by name. Must be called under RTNL semaphore
599 * or @dev_base_lock. If the name is found a pointer to the device
600 * is returned. If the name is not found then %NULL is returned. The
601 * reference counters are not incremented so the caller must be
602 * careful with locks.
605 struct net_device *__dev_get_by_name(struct net *net, const char *name)
607 struct hlist_node *p;
608 struct net_device *dev;
609 struct hlist_head *head = dev_name_hash(net, name);
611 hlist_for_each_entry(dev, p, head, name_hlist)
612 if (!strncmp(dev->name, name, IFNAMSIZ))
617 EXPORT_SYMBOL(__dev_get_by_name);
620 * dev_get_by_name_rcu - find a device by its name
621 * @net: the applicable net namespace
622 * @name: name to find
624 * Find an interface by name.
625 * If the name is found a pointer to the device is returned.
626 * If the name is not found then %NULL is returned.
627 * The reference counters are not incremented so the caller must be
628 * careful with locks. The caller must hold RCU lock.
631 struct net_device *dev_get_by_name_rcu(struct net *net, const char *name)
633 struct hlist_node *p;
634 struct net_device *dev;
635 struct hlist_head *head = dev_name_hash(net, name);
637 hlist_for_each_entry_rcu(dev, p, head, name_hlist)
638 if (!strncmp(dev->name, name, IFNAMSIZ))
643 EXPORT_SYMBOL(dev_get_by_name_rcu);
646 * dev_get_by_name - find a device by its name
647 * @net: the applicable net namespace
648 * @name: name to find
650 * Find an interface by name. This can be called from any
651 * context and does its own locking. The returned handle has
652 * the usage count incremented and the caller must use dev_put() to
653 * release it when it is no longer needed. %NULL is returned if no
654 * matching device is found.
657 struct net_device *dev_get_by_name(struct net *net, const char *name)
659 struct net_device *dev;
662 dev = dev_get_by_name_rcu(net, name);
668 EXPORT_SYMBOL(dev_get_by_name);
671 * __dev_get_by_index - find a device by its ifindex
672 * @net: the applicable net namespace
673 * @ifindex: index of device
675 * Search for an interface by index. Returns %NULL if the device
676 * is not found or a pointer to the device. The device has not
677 * had its reference counter increased so the caller must be careful
678 * about locking. The caller must hold either the RTNL semaphore
682 struct net_device *__dev_get_by_index(struct net *net, int ifindex)
684 struct hlist_node *p;
685 struct net_device *dev;
686 struct hlist_head *head = dev_index_hash(net, ifindex);
688 hlist_for_each_entry(dev, p, head, index_hlist)
689 if (dev->ifindex == ifindex)
694 EXPORT_SYMBOL(__dev_get_by_index);
697 * dev_get_by_index_rcu - find a device by its ifindex
698 * @net: the applicable net namespace
699 * @ifindex: index of device
701 * Search for an interface by index. Returns %NULL if the device
702 * is not found or a pointer to the device. The device has not
703 * had its reference counter increased so the caller must be careful
704 * about locking. The caller must hold RCU lock.
707 struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex)
709 struct hlist_node *p;
710 struct net_device *dev;
711 struct hlist_head *head = dev_index_hash(net, ifindex);
713 hlist_for_each_entry_rcu(dev, p, head, index_hlist)
714 if (dev->ifindex == ifindex)
719 EXPORT_SYMBOL(dev_get_by_index_rcu);
723 * dev_get_by_index - find a device by its ifindex
724 * @net: the applicable net namespace
725 * @ifindex: index of device
727 * Search for an interface by index. Returns NULL if the device
728 * is not found or a pointer to the device. The device returned has
729 * had a reference added and the pointer is safe until the user calls
730 * dev_put to indicate they have finished with it.
733 struct net_device *dev_get_by_index(struct net *net, int ifindex)
735 struct net_device *dev;
738 dev = dev_get_by_index_rcu(net, ifindex);
744 EXPORT_SYMBOL(dev_get_by_index);
747 * dev_getbyhwaddr_rcu - find a device by its hardware address
748 * @net: the applicable net namespace
749 * @type: media type of device
750 * @ha: hardware address
752 * Search for an interface by MAC address. Returns NULL if the device
753 * is not found or a pointer to the device.
754 * The caller must hold RCU or RTNL.
755 * The returned device has not had its ref count increased
756 * and the caller must therefore be careful about locking
760 struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
763 struct net_device *dev;
765 for_each_netdev_rcu(net, dev)
766 if (dev->type == type &&
767 !memcmp(dev->dev_addr, ha, dev->addr_len))
772 EXPORT_SYMBOL(dev_getbyhwaddr_rcu);
774 struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
776 struct net_device *dev;
779 for_each_netdev(net, dev)
780 if (dev->type == type)
785 EXPORT_SYMBOL(__dev_getfirstbyhwtype);
787 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
789 struct net_device *dev, *ret = NULL;
792 for_each_netdev_rcu(net, dev)
793 if (dev->type == type) {
801 EXPORT_SYMBOL(dev_getfirstbyhwtype);
804 * dev_get_by_flags_rcu - find any device with given flags
805 * @net: the applicable net namespace
806 * @if_flags: IFF_* values
807 * @mask: bitmask of bits in if_flags to check
809 * Search for any interface with the given flags. Returns NULL if a device
810 * is not found or a pointer to the device. Must be called inside
811 * rcu_read_lock(), and result refcount is unchanged.
814 struct net_device *dev_get_by_flags_rcu(struct net *net, unsigned short if_flags,
817 struct net_device *dev, *ret;
820 for_each_netdev_rcu(net, dev) {
821 if (((dev->flags ^ if_flags) & mask) == 0) {
828 EXPORT_SYMBOL(dev_get_by_flags_rcu);
831 * dev_valid_name - check if name is okay for network device
834 * Network device names need to be valid file names to
835 * to allow sysfs to work. We also disallow any kind of
838 int dev_valid_name(const char *name)
842 if (strlen(name) >= IFNAMSIZ)
844 if (!strcmp(name, ".") || !strcmp(name, ".."))
848 if (*name == '/' || isspace(*name))
854 EXPORT_SYMBOL(dev_valid_name);
857 * __dev_alloc_name - allocate a name for a device
858 * @net: network namespace to allocate the device name in
859 * @name: name format string
860 * @buf: scratch buffer and result name string
862 * Passed a format string - eg "lt%d" it will try and find a suitable
863 * id. It scans list of devices to build up a free map, then chooses
864 * the first empty slot. The caller must hold the dev_base or rtnl lock
865 * while allocating the name and adding the device in order to avoid
867 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
868 * Returns the number of the unit assigned or a negative errno code.
871 static int __dev_alloc_name(struct net *net, const char *name, char *buf)
875 const int max_netdevices = 8*PAGE_SIZE;
876 unsigned long *inuse;
877 struct net_device *d;
879 p = strnchr(name, IFNAMSIZ-1, '%');
882 * Verify the string as this thing may have come from
883 * the user. There must be either one "%d" and no other "%"
886 if (p[1] != 'd' || strchr(p + 2, '%'))
889 /* Use one page as a bit array of possible slots */
890 inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
894 for_each_netdev(net, d) {
895 if (!sscanf(d->name, name, &i))
897 if (i < 0 || i >= max_netdevices)
900 /* avoid cases where sscanf is not exact inverse of printf */
901 snprintf(buf, IFNAMSIZ, name, i);
902 if (!strncmp(buf, d->name, IFNAMSIZ))
906 i = find_first_zero_bit(inuse, max_netdevices);
907 free_page((unsigned long) inuse);
911 snprintf(buf, IFNAMSIZ, name, i);
912 if (!__dev_get_by_name(net, buf))
915 /* It is possible to run out of possible slots
916 * when the name is long and there isn't enough space left
917 * for the digits, or if all bits are used.
923 * dev_alloc_name - allocate a name for a device
925 * @name: name format string
927 * Passed a format string - eg "lt%d" it will try and find a suitable
928 * id. It scans list of devices to build up a free map, then chooses
929 * the first empty slot. The caller must hold the dev_base or rtnl lock
930 * while allocating the name and adding the device in order to avoid
932 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
933 * Returns the number of the unit assigned or a negative errno code.
936 int dev_alloc_name(struct net_device *dev, const char *name)
942 BUG_ON(!dev_net(dev));
944 ret = __dev_alloc_name(net, name, buf);
946 strlcpy(dev->name, buf, IFNAMSIZ);
949 EXPORT_SYMBOL(dev_alloc_name);
951 static int dev_get_valid_name(struct net_device *dev, const char *name, bool fmt)
955 BUG_ON(!dev_net(dev));
958 if (!dev_valid_name(name))
961 if (fmt && strchr(name, '%'))
962 return dev_alloc_name(dev, name);
963 else if (__dev_get_by_name(net, name))
965 else if (dev->name != name)
966 strlcpy(dev->name, name, IFNAMSIZ);
972 * dev_change_name - change name of a device
974 * @newname: name (or format string) must be at least IFNAMSIZ
976 * Change name of a device, can pass format strings "eth%d".
979 int dev_change_name(struct net_device *dev, const char *newname)
981 char oldname[IFNAMSIZ];
987 BUG_ON(!dev_net(dev));
990 if (dev->flags & IFF_UP)
993 if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
996 memcpy(oldname, dev->name, IFNAMSIZ);
998 err = dev_get_valid_name(dev, newname, 1);
1003 ret = device_rename(&dev->dev, dev->name);
1005 memcpy(dev->name, oldname, IFNAMSIZ);
1009 write_lock_bh(&dev_base_lock);
1010 hlist_del(&dev->name_hlist);
1011 write_unlock_bh(&dev_base_lock);
1015 write_lock_bh(&dev_base_lock);
1016 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
1017 write_unlock_bh(&dev_base_lock);
1019 ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
1020 ret = notifier_to_errno(ret);
1023 /* err >= 0 after dev_alloc_name() or stores the first errno */
1026 memcpy(dev->name, oldname, IFNAMSIZ);
1030 "%s: name change rollback failed: %d.\n",
1039 * dev_set_alias - change ifalias of a device
1041 * @alias: name up to IFALIASZ
1042 * @len: limit of bytes to copy from info
1044 * Set ifalias for a device,
1046 int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
1050 if (len >= IFALIASZ)
1055 kfree(dev->ifalias);
1056 dev->ifalias = NULL;
1061 dev->ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL);
1065 strlcpy(dev->ifalias, alias, len+1);
1071 * netdev_features_change - device changes features
1072 * @dev: device to cause notification
1074 * Called to indicate a device has changed features.
1076 void netdev_features_change(struct net_device *dev)
1078 call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
1080 EXPORT_SYMBOL(netdev_features_change);
1083 * netdev_state_change - device changes state
1084 * @dev: device to cause notification
1086 * Called to indicate a device has changed state. This function calls
1087 * the notifier chains for netdev_chain and sends a NEWLINK message
1088 * to the routing socket.
1090 void netdev_state_change(struct net_device *dev)
1092 if (dev->flags & IFF_UP) {
1093 call_netdevice_notifiers(NETDEV_CHANGE, dev);
1094 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1097 EXPORT_SYMBOL(netdev_state_change);
1099 int netdev_bonding_change(struct net_device *dev, unsigned long event)
1101 return call_netdevice_notifiers(event, dev);
1103 EXPORT_SYMBOL(netdev_bonding_change);
1106 * dev_load - load a network module
1107 * @net: the applicable net namespace
1108 * @name: name of interface
1110 * If a network interface is not present and the process has suitable
1111 * privileges this function loads the module. If module loading is not
1112 * available in this kernel then it becomes a nop.
1115 void dev_load(struct net *net, const char *name)
1117 struct net_device *dev;
1121 dev = dev_get_by_name_rcu(net, name);
1125 if (no_module && capable(CAP_NET_ADMIN))
1126 no_module = request_module("netdev-%s", name);
1127 if (no_module && capable(CAP_SYS_MODULE)) {
1128 if (!request_module("%s", name))
1129 pr_err("Loading kernel module for a network device "
1130 "with CAP_SYS_MODULE (deprecated). Use CAP_NET_ADMIN and alias netdev-%s "
1134 EXPORT_SYMBOL(dev_load);
1136 static int __dev_open(struct net_device *dev)
1138 const struct net_device_ops *ops = dev->netdev_ops;
1144 * Is it even present?
1146 if (!netif_device_present(dev))
1149 ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev);
1150 ret = notifier_to_errno(ret);
1155 * Call device private open method
1157 set_bit(__LINK_STATE_START, &dev->state);
1159 if (ops->ndo_validate_addr)
1160 ret = ops->ndo_validate_addr(dev);
1162 if (!ret && ops->ndo_open)
1163 ret = ops->ndo_open(dev);
1166 * If it went open OK then:
1170 clear_bit(__LINK_STATE_START, &dev->state);
1175 dev->flags |= IFF_UP;
1180 net_dmaengine_get();
1183 * Initialize multicasting status
1185 dev_set_rx_mode(dev);
1188 * Wakeup transmit queue engine
1197 * dev_open - prepare an interface for use.
1198 * @dev: device to open
1200 * Takes a device from down to up state. The device's private open
1201 * function is invoked and then the multicast lists are loaded. Finally
1202 * the device is moved into the up state and a %NETDEV_UP message is
1203 * sent to the netdev notifier chain.
1205 * Calling this function on an active interface is a nop. On a failure
1206 * a negative errno code is returned.
1208 int dev_open(struct net_device *dev)
1215 if (dev->flags & IFF_UP)
1221 ret = __dev_open(dev);
1226 * ... and announce new interface.
1228 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1229 call_netdevice_notifiers(NETDEV_UP, dev);
1233 EXPORT_SYMBOL(dev_open);
1235 static int __dev_close_many(struct list_head *head)
1237 struct net_device *dev;
1242 list_for_each_entry(dev, head, unreg_list) {
1244 * Tell people we are going down, so that they can
1245 * prepare to death, when device is still operating.
1247 call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
1249 clear_bit(__LINK_STATE_START, &dev->state);
1251 /* Synchronize to scheduled poll. We cannot touch poll list, it
1252 * can be even on different cpu. So just clear netif_running().
1254 * dev->stop() will invoke napi_disable() on all of it's
1255 * napi_struct instances on this device.
1257 smp_mb__after_clear_bit(); /* Commit netif_running(). */
1260 dev_deactivate_many(head);
1262 list_for_each_entry(dev, head, unreg_list) {
1263 const struct net_device_ops *ops = dev->netdev_ops;
1266 * Call the device specific close. This cannot fail.
1267 * Only if device is UP
1269 * We allow it to be called even after a DETACH hot-plug
1276 * Device is now down.
1279 dev->flags &= ~IFF_UP;
1284 net_dmaengine_put();
1290 static int __dev_close(struct net_device *dev)
1295 list_add(&dev->unreg_list, &single);
1296 retval = __dev_close_many(&single);
1301 static int dev_close_many(struct list_head *head)
1303 struct net_device *dev, *tmp;
1304 LIST_HEAD(tmp_list);
1306 list_for_each_entry_safe(dev, tmp, head, unreg_list)
1307 if (!(dev->flags & IFF_UP))
1308 list_move(&dev->unreg_list, &tmp_list);
1310 __dev_close_many(head);
1313 * Tell people we are down
1315 list_for_each_entry(dev, head, unreg_list) {
1316 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1317 call_netdevice_notifiers(NETDEV_DOWN, dev);
1320 /* rollback_registered_many needs the complete original list */
1321 list_splice(&tmp_list, head);
1326 * dev_close - shutdown an interface.
1327 * @dev: device to shutdown
1329 * This function moves an active device into down state. A
1330 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1331 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1334 int dev_close(struct net_device *dev)
1338 list_add(&dev->unreg_list, &single);
1339 dev_close_many(&single);
1343 EXPORT_SYMBOL(dev_close);
1347 * dev_disable_lro - disable Large Receive Offload on a device
1350 * Disable Large Receive Offload (LRO) on a net device. Must be
1351 * called under RTNL. This is needed if received packets may be
1352 * forwarded to another interface.
1354 void dev_disable_lro(struct net_device *dev)
1356 if (dev->ethtool_ops && dev->ethtool_ops->get_flags &&
1357 dev->ethtool_ops->set_flags) {
1358 u32 flags = dev->ethtool_ops->get_flags(dev);
1359 if (flags & ETH_FLAG_LRO) {
1360 flags &= ~ETH_FLAG_LRO;
1361 dev->ethtool_ops->set_flags(dev, flags);
1364 WARN_ON(dev->features & NETIF_F_LRO);
1366 EXPORT_SYMBOL(dev_disable_lro);
1369 static int dev_boot_phase = 1;
1372 * Device change register/unregister. These are not inline or static
1373 * as we export them to the world.
1377 * register_netdevice_notifier - register a network notifier block
1380 * Register a notifier to be called when network device events occur.
1381 * The notifier passed is linked into the kernel structures and must
1382 * not be reused until it has been unregistered. A negative errno code
1383 * is returned on a failure.
1385 * When registered all registration and up events are replayed
1386 * to the new notifier to allow device to have a race free
1387 * view of the network device list.
1390 int register_netdevice_notifier(struct notifier_block *nb)
1392 struct net_device *dev;
1393 struct net_device *last;
1398 err = raw_notifier_chain_register(&netdev_chain, nb);
1404 for_each_netdev(net, dev) {
1405 err = nb->notifier_call(nb, NETDEV_REGISTER, dev);
1406 err = notifier_to_errno(err);
1410 if (!(dev->flags & IFF_UP))
1413 nb->notifier_call(nb, NETDEV_UP, dev);
1424 for_each_netdev(net, dev) {
1428 if (dev->flags & IFF_UP) {
1429 nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
1430 nb->notifier_call(nb, NETDEV_DOWN, dev);
1432 nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
1433 nb->notifier_call(nb, NETDEV_UNREGISTER_BATCH, dev);
1437 raw_notifier_chain_unregister(&netdev_chain, nb);
1440 EXPORT_SYMBOL(register_netdevice_notifier);
1443 * unregister_netdevice_notifier - unregister a network notifier block
1446 * Unregister a notifier previously registered by
1447 * register_netdevice_notifier(). The notifier is unlinked into the
1448 * kernel structures and may then be reused. A negative errno code
1449 * is returned on a failure.
1452 int unregister_netdevice_notifier(struct notifier_block *nb)
1457 err = raw_notifier_chain_unregister(&netdev_chain, nb);
1461 EXPORT_SYMBOL(unregister_netdevice_notifier);
1464 * call_netdevice_notifiers - call all network notifier blocks
1465 * @val: value passed unmodified to notifier function
1466 * @dev: net_device pointer passed unmodified to notifier function
1468 * Call all network notifier blocks. Parameters and return value
1469 * are as for raw_notifier_call_chain().
1472 int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
1475 return raw_notifier_call_chain(&netdev_chain, val, dev);
1478 /* When > 0 there are consumers of rx skb time stamps */
1479 static atomic_t netstamp_needed = ATOMIC_INIT(0);
1481 void net_enable_timestamp(void)
1483 atomic_inc(&netstamp_needed);
1485 EXPORT_SYMBOL(net_enable_timestamp);
1487 void net_disable_timestamp(void)
1489 atomic_dec(&netstamp_needed);
1491 EXPORT_SYMBOL(net_disable_timestamp);
1493 static inline void net_timestamp_set(struct sk_buff *skb)
1495 if (atomic_read(&netstamp_needed))
1496 __net_timestamp(skb);
1498 skb->tstamp.tv64 = 0;
1501 static inline void net_timestamp_check(struct sk_buff *skb)
1503 if (!skb->tstamp.tv64 && atomic_read(&netstamp_needed))
1504 __net_timestamp(skb);
1508 * dev_forward_skb - loopback an skb to another netif
1510 * @dev: destination network device
1511 * @skb: buffer to forward
1514 * NET_RX_SUCCESS (no congestion)
1515 * NET_RX_DROP (packet was dropped, but freed)
1517 * dev_forward_skb can be used for injecting an skb from the
1518 * start_xmit function of one device into the receive queue
1519 * of another device.
1521 * The receiving device may be in another namespace, so
1522 * we have to clear all information in the skb that could
1523 * impact namespace isolation.
1525 int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
1530 if (unlikely(!(dev->flags & IFF_UP) ||
1531 (skb->len > (dev->mtu + dev->hard_header_len + VLAN_HLEN)))) {
1532 atomic_long_inc(&dev->rx_dropped);
1536 skb_set_dev(skb, dev);
1537 skb->tstamp.tv64 = 0;
1538 skb->pkt_type = PACKET_HOST;
1539 skb->protocol = eth_type_trans(skb, dev);
1540 return netif_rx(skb);
1542 EXPORT_SYMBOL_GPL(dev_forward_skb);
1544 static inline int deliver_skb(struct sk_buff *skb,
1545 struct packet_type *pt_prev,
1546 struct net_device *orig_dev)
1548 atomic_inc(&skb->users);
1549 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
1553 * Support routine. Sends outgoing frames to any network
1554 * taps currently in use.
1557 static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1559 struct packet_type *ptype;
1560 struct sk_buff *skb2 = NULL;
1561 struct packet_type *pt_prev = NULL;
1564 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1565 /* Never send packets back to the socket
1566 * they originated from - MvS (miquels@drinkel.ow.org)
1568 if ((ptype->dev == dev || !ptype->dev) &&
1569 (ptype->af_packet_priv == NULL ||
1570 (struct sock *)ptype->af_packet_priv != skb->sk)) {
1572 deliver_skb(skb2, pt_prev, skb->dev);
1577 skb2 = skb_clone(skb, GFP_ATOMIC);
1581 net_timestamp_set(skb2);
1583 /* skb->nh should be correctly
1584 set by sender, so that the second statement is
1585 just protection against buggy protocols.
1587 skb_reset_mac_header(skb2);
1589 if (skb_network_header(skb2) < skb2->data ||
1590 skb2->network_header > skb2->tail) {
1591 if (net_ratelimit())
1592 printk(KERN_CRIT "protocol %04x is "
1594 ntohs(skb2->protocol),
1596 skb_reset_network_header(skb2);
1599 skb2->transport_header = skb2->network_header;
1600 skb2->pkt_type = PACKET_OUTGOING;
1605 pt_prev->func(skb2, skb->dev, pt_prev, skb->dev);
1609 /* netif_setup_tc - Handle tc mappings on real_num_tx_queues change
1610 * @dev: Network device
1611 * @txq: number of queues available
1613 * If real_num_tx_queues is changed the tc mappings may no longer be
1614 * valid. To resolve this verify the tc mapping remains valid and if
1615 * not NULL the mapping. With no priorities mapping to this
1616 * offset/count pair it will no longer be used. In the worst case TC0
1617 * is invalid nothing can be done so disable priority mappings. If is
1618 * expected that drivers will fix this mapping if they can before
1619 * calling netif_set_real_num_tx_queues.
1621 static void netif_setup_tc(struct net_device *dev, unsigned int txq)
1624 struct netdev_tc_txq *tc = &dev->tc_to_txq[0];
1626 /* If TC0 is invalidated disable TC mapping */
1627 if (tc->offset + tc->count > txq) {
1628 pr_warning("Number of in use tx queues changed "
1629 "invalidating tc mappings. Priority "
1630 "traffic classification disabled!\n");
1635 /* Invalidated prio to tc mappings set to TC0 */
1636 for (i = 1; i < TC_BITMASK + 1; i++) {
1637 int q = netdev_get_prio_tc_map(dev, i);
1639 tc = &dev->tc_to_txq[q];
1640 if (tc->offset + tc->count > txq) {
1641 pr_warning("Number of in use tx queues "
1642 "changed. Priority %i to tc "
1643 "mapping %i is no longer valid "
1644 "setting map to 0\n",
1646 netdev_set_prio_tc_map(dev, i, 0);
1652 * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
1653 * greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
1655 int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq)
1659 if (txq < 1 || txq > dev->num_tx_queues)
1662 if (dev->reg_state == NETREG_REGISTERED ||
1663 dev->reg_state == NETREG_UNREGISTERING) {
1666 rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues,
1672 netif_setup_tc(dev, txq);
1674 if (txq < dev->real_num_tx_queues)
1675 qdisc_reset_all_tx_gt(dev, txq);
1678 dev->real_num_tx_queues = txq;
1681 EXPORT_SYMBOL(netif_set_real_num_tx_queues);
1685 * netif_set_real_num_rx_queues - set actual number of RX queues used
1686 * @dev: Network device
1687 * @rxq: Actual number of RX queues
1689 * This must be called either with the rtnl_lock held or before
1690 * registration of the net device. Returns 0 on success, or a
1691 * negative error code. If called before registration, it always
1694 int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq)
1698 if (rxq < 1 || rxq > dev->num_rx_queues)
1701 if (dev->reg_state == NETREG_REGISTERED) {
1704 rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues,
1710 dev->real_num_rx_queues = rxq;
1713 EXPORT_SYMBOL(netif_set_real_num_rx_queues);
1716 static inline void __netif_reschedule(struct Qdisc *q)
1718 struct softnet_data *sd;
1719 unsigned long flags;
1721 local_irq_save(flags);
1722 sd = &__get_cpu_var(softnet_data);
1723 q->next_sched = NULL;
1724 *sd->output_queue_tailp = q;
1725 sd->output_queue_tailp = &q->next_sched;
1726 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1727 local_irq_restore(flags);
1730 void __netif_schedule(struct Qdisc *q)
1732 if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
1733 __netif_reschedule(q);
1735 EXPORT_SYMBOL(__netif_schedule);
1737 void dev_kfree_skb_irq(struct sk_buff *skb)
1739 if (atomic_dec_and_test(&skb->users)) {
1740 struct softnet_data *sd;
1741 unsigned long flags;
1743 local_irq_save(flags);
1744 sd = &__get_cpu_var(softnet_data);
1745 skb->next = sd->completion_queue;
1746 sd->completion_queue = skb;
1747 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1748 local_irq_restore(flags);
1751 EXPORT_SYMBOL(dev_kfree_skb_irq);
1753 void dev_kfree_skb_any(struct sk_buff *skb)
1755 if (in_irq() || irqs_disabled())
1756 dev_kfree_skb_irq(skb);
1760 EXPORT_SYMBOL(dev_kfree_skb_any);
1764 * netif_device_detach - mark device as removed
1765 * @dev: network device
1767 * Mark device as removed from system and therefore no longer available.
1769 void netif_device_detach(struct net_device *dev)
1771 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
1772 netif_running(dev)) {
1773 netif_tx_stop_all_queues(dev);
1776 EXPORT_SYMBOL(netif_device_detach);
1779 * netif_device_attach - mark device as attached
1780 * @dev: network device
1782 * Mark device as attached from system and restart if needed.
1784 void netif_device_attach(struct net_device *dev)
1786 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
1787 netif_running(dev)) {
1788 netif_tx_wake_all_queues(dev);
1789 __netdev_watchdog_up(dev);
1792 EXPORT_SYMBOL(netif_device_attach);
1795 * skb_dev_set -- assign a new device to a buffer
1796 * @skb: buffer for the new device
1797 * @dev: network device
1799 * If an skb is owned by a device already, we have to reset
1800 * all data private to the namespace a device belongs to
1801 * before assigning it a new device.
1803 #ifdef CONFIG_NET_NS
1804 void skb_set_dev(struct sk_buff *skb, struct net_device *dev)
1807 if (skb->dev && !net_eq(dev_net(skb->dev), dev_net(dev))) {
1810 skb_init_secmark(skb);
1814 skb->ipvs_property = 0;
1815 #ifdef CONFIG_NET_SCHED
1821 EXPORT_SYMBOL(skb_set_dev);
1822 #endif /* CONFIG_NET_NS */
1825 * Invalidate hardware checksum when packet is to be mangled, and
1826 * complete checksum manually on outgoing path.
1828 int skb_checksum_help(struct sk_buff *skb)
1831 int ret = 0, offset;
1833 if (skb->ip_summed == CHECKSUM_COMPLETE)
1834 goto out_set_summed;
1836 if (unlikely(skb_shinfo(skb)->gso_size)) {
1837 /* Let GSO fix up the checksum. */
1838 goto out_set_summed;
1841 offset = skb_checksum_start_offset(skb);
1842 BUG_ON(offset >= skb_headlen(skb));
1843 csum = skb_checksum(skb, offset, skb->len - offset, 0);
1845 offset += skb->csum_offset;
1846 BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
1848 if (skb_cloned(skb) &&
1849 !skb_clone_writable(skb, offset + sizeof(__sum16))) {
1850 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1855 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1857 skb->ip_summed = CHECKSUM_NONE;
1861 EXPORT_SYMBOL(skb_checksum_help);
1864 * skb_gso_segment - Perform segmentation on skb.
1865 * @skb: buffer to segment
1866 * @features: features for the output path (see dev->features)
1868 * This function segments the given skb and returns a list of segments.
1870 * It may return NULL if the skb requires no segmentation. This is
1871 * only possible when GSO is used for verifying header integrity.
1873 struct sk_buff *skb_gso_segment(struct sk_buff *skb, u32 features)
1875 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
1876 struct packet_type *ptype;
1877 __be16 type = skb->protocol;
1878 int vlan_depth = ETH_HLEN;
1881 while (type == htons(ETH_P_8021Q)) {
1882 struct vlan_hdr *vh;
1884 if (unlikely(!pskb_may_pull(skb, vlan_depth + VLAN_HLEN)))
1885 return ERR_PTR(-EINVAL);
1887 vh = (struct vlan_hdr *)(skb->data + vlan_depth);
1888 type = vh->h_vlan_encapsulated_proto;
1889 vlan_depth += VLAN_HLEN;
1892 skb_reset_mac_header(skb);
1893 skb->mac_len = skb->network_header - skb->mac_header;
1894 __skb_pull(skb, skb->mac_len);
1896 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1897 struct net_device *dev = skb->dev;
1898 struct ethtool_drvinfo info = {};
1900 if (dev && dev->ethtool_ops && dev->ethtool_ops->get_drvinfo)
1901 dev->ethtool_ops->get_drvinfo(dev, &info);
1903 WARN(1, "%s: caps=(0x%lx, 0x%lx) len=%d data_len=%d ip_summed=%d\n",
1904 info.driver, dev ? dev->features : 0L,
1905 skb->sk ? skb->sk->sk_route_caps : 0L,
1906 skb->len, skb->data_len, skb->ip_summed);
1908 if (skb_header_cloned(skb) &&
1909 (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
1910 return ERR_PTR(err);
1914 list_for_each_entry_rcu(ptype,
1915 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
1916 if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1917 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1918 err = ptype->gso_send_check(skb);
1919 segs = ERR_PTR(err);
1920 if (err || skb_gso_ok(skb, features))
1922 __skb_push(skb, (skb->data -
1923 skb_network_header(skb)));
1925 segs = ptype->gso_segment(skb, features);
1931 __skb_push(skb, skb->data - skb_mac_header(skb));
1935 EXPORT_SYMBOL(skb_gso_segment);
1937 /* Take action when hardware reception checksum errors are detected. */
1939 void netdev_rx_csum_fault(struct net_device *dev)
1941 if (net_ratelimit()) {
1942 printk(KERN_ERR "%s: hw csum failure.\n",
1943 dev ? dev->name : "<unknown>");
1947 EXPORT_SYMBOL(netdev_rx_csum_fault);
1950 /* Actually, we should eliminate this check as soon as we know, that:
1951 * 1. IOMMU is present and allows to map all the memory.
1952 * 2. No high memory really exists on this machine.
1955 static int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
1957 #ifdef CONFIG_HIGHMEM
1959 if (!(dev->features & NETIF_F_HIGHDMA)) {
1960 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
1961 if (PageHighMem(skb_shinfo(skb)->frags[i].page))
1965 if (PCI_DMA_BUS_IS_PHYS) {
1966 struct device *pdev = dev->dev.parent;
1970 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1971 dma_addr_t addr = page_to_phys(skb_shinfo(skb)->frags[i].page);
1972 if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask)
1981 void (*destructor)(struct sk_buff *skb);
1984 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
1986 static void dev_gso_skb_destructor(struct sk_buff *skb)
1988 struct dev_gso_cb *cb;
1991 struct sk_buff *nskb = skb->next;
1993 skb->next = nskb->next;
1996 } while (skb->next);
1998 cb = DEV_GSO_CB(skb);
2000 cb->destructor(skb);
2004 * dev_gso_segment - Perform emulated hardware segmentation on skb.
2005 * @skb: buffer to segment
2006 * @features: device features as applicable to this skb
2008 * This function segments the given skb and stores the list of segments
2011 static int dev_gso_segment(struct sk_buff *skb, int features)
2013 struct sk_buff *segs;
2015 segs = skb_gso_segment(skb, features);
2017 /* Verifying header integrity only. */
2022 return PTR_ERR(segs);
2025 DEV_GSO_CB(skb)->destructor = skb->destructor;
2026 skb->destructor = dev_gso_skb_destructor;
2032 * Try to orphan skb early, right before transmission by the device.
2033 * We cannot orphan skb if tx timestamp is requested or the sk-reference
2034 * is needed on driver level for other reasons, e.g. see net/can/raw.c
2036 static inline void skb_orphan_try(struct sk_buff *skb)
2038 struct sock *sk = skb->sk;
2040 if (sk && !skb_shinfo(skb)->tx_flags) {
2041 /* skb_tx_hash() wont be able to get sk.
2042 * We copy sk_hash into skb->rxhash
2045 skb->rxhash = sk->sk_hash;
2050 static bool can_checksum_protocol(unsigned long features, __be16 protocol)
2052 return ((features & NETIF_F_GEN_CSUM) ||
2053 ((features & NETIF_F_V4_CSUM) &&
2054 protocol == htons(ETH_P_IP)) ||
2055 ((features & NETIF_F_V6_CSUM) &&
2056 protocol == htons(ETH_P_IPV6)) ||
2057 ((features & NETIF_F_FCOE_CRC) &&
2058 protocol == htons(ETH_P_FCOE)));
2061 static u32 harmonize_features(struct sk_buff *skb, __be16 protocol, u32 features)
2063 if (!can_checksum_protocol(features, protocol)) {
2064 features &= ~NETIF_F_ALL_CSUM;
2065 features &= ~NETIF_F_SG;
2066 } else if (illegal_highdma(skb->dev, skb)) {
2067 features &= ~NETIF_F_SG;
2073 u32 netif_skb_features(struct sk_buff *skb)
2075 __be16 protocol = skb->protocol;
2076 u32 features = skb->dev->features;
2078 if (protocol == htons(ETH_P_8021Q)) {
2079 struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
2080 protocol = veh->h_vlan_encapsulated_proto;
2081 } else if (!vlan_tx_tag_present(skb)) {
2082 return harmonize_features(skb, protocol, features);
2085 features &= (skb->dev->vlan_features | NETIF_F_HW_VLAN_TX);
2087 if (protocol != htons(ETH_P_8021Q)) {
2088 return harmonize_features(skb, protocol, features);
2090 features &= NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST |
2091 NETIF_F_GEN_CSUM | NETIF_F_HW_VLAN_TX;
2092 return harmonize_features(skb, protocol, features);
2095 EXPORT_SYMBOL(netif_skb_features);
2098 * Returns true if either:
2099 * 1. skb has frag_list and the device doesn't support FRAGLIST, or
2100 * 2. skb is fragmented and the device does not support SG, or if
2101 * at least one of fragments is in highmem and device does not
2102 * support DMA from it.
2104 static inline int skb_needs_linearize(struct sk_buff *skb,
2107 return skb_is_nonlinear(skb) &&
2108 ((skb_has_frag_list(skb) &&
2109 !(features & NETIF_F_FRAGLIST)) ||
2110 (skb_shinfo(skb)->nr_frags &&
2111 !(features & NETIF_F_SG)));
2114 int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
2115 struct netdev_queue *txq)
2117 const struct net_device_ops *ops = dev->netdev_ops;
2118 int rc = NETDEV_TX_OK;
2120 if (likely(!skb->next)) {
2124 * If device doesnt need skb->dst, release it right now while
2125 * its hot in this cpu cache
2127 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
2130 if (!list_empty(&ptype_all))
2131 dev_queue_xmit_nit(skb, dev);
2133 skb_orphan_try(skb);
2135 features = netif_skb_features(skb);
2137 if (vlan_tx_tag_present(skb) &&
2138 !(features & NETIF_F_HW_VLAN_TX)) {
2139 skb = __vlan_put_tag(skb, vlan_tx_tag_get(skb));
2146 if (netif_needs_gso(skb, features)) {
2147 if (unlikely(dev_gso_segment(skb, features)))
2152 if (skb_needs_linearize(skb, features) &&
2153 __skb_linearize(skb))
2156 /* If packet is not checksummed and device does not
2157 * support checksumming for this protocol, complete
2158 * checksumming here.
2160 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2161 skb_set_transport_header(skb,
2162 skb_checksum_start_offset(skb));
2163 if (!(features & NETIF_F_ALL_CSUM) &&
2164 skb_checksum_help(skb))
2169 rc = ops->ndo_start_xmit(skb, dev);
2170 trace_net_dev_xmit(skb, rc);
2171 if (rc == NETDEV_TX_OK)
2172 txq_trans_update(txq);
2178 struct sk_buff *nskb = skb->next;
2180 skb->next = nskb->next;
2184 * If device doesnt need nskb->dst, release it right now while
2185 * its hot in this cpu cache
2187 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
2190 rc = ops->ndo_start_xmit(nskb, dev);
2191 trace_net_dev_xmit(nskb, rc);
2192 if (unlikely(rc != NETDEV_TX_OK)) {
2193 if (rc & ~NETDEV_TX_MASK)
2194 goto out_kfree_gso_skb;
2195 nskb->next = skb->next;
2199 txq_trans_update(txq);
2200 if (unlikely(netif_tx_queue_stopped(txq) && skb->next))
2201 return NETDEV_TX_BUSY;
2202 } while (skb->next);
2205 if (likely(skb->next == NULL))
2206 skb->destructor = DEV_GSO_CB(skb)->destructor;
2213 static u32 hashrnd __read_mostly;
2216 * Returns a Tx hash based on the given packet descriptor a Tx queues' number
2217 * to be used as a distribution range.
2219 u16 __skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb,
2220 unsigned int num_tx_queues)
2224 u16 qcount = num_tx_queues;
2226 if (skb_rx_queue_recorded(skb)) {
2227 hash = skb_get_rx_queue(skb);
2228 while (unlikely(hash >= num_tx_queues))
2229 hash -= num_tx_queues;
2234 u8 tc = netdev_get_prio_tc_map(dev, skb->priority);
2235 qoffset = dev->tc_to_txq[tc].offset;
2236 qcount = dev->tc_to_txq[tc].count;
2239 if (skb->sk && skb->sk->sk_hash)
2240 hash = skb->sk->sk_hash;
2242 hash = (__force u16) skb->protocol ^ skb->rxhash;
2243 hash = jhash_1word(hash, hashrnd);
2245 return (u16) (((u64) hash * qcount) >> 32) + qoffset;
2247 EXPORT_SYMBOL(__skb_tx_hash);
2249 static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index)
2251 if (unlikely(queue_index >= dev->real_num_tx_queues)) {
2252 if (net_ratelimit()) {
2253 pr_warning("%s selects TX queue %d, but "
2254 "real number of TX queues is %d\n",
2255 dev->name, queue_index, dev->real_num_tx_queues);
2262 static inline int get_xps_queue(struct net_device *dev, struct sk_buff *skb)
2265 struct xps_dev_maps *dev_maps;
2266 struct xps_map *map;
2267 int queue_index = -1;
2270 dev_maps = rcu_dereference(dev->xps_maps);
2272 map = rcu_dereference(
2273 dev_maps->cpu_map[raw_smp_processor_id()]);
2276 queue_index = map->queues[0];
2279 if (skb->sk && skb->sk->sk_hash)
2280 hash = skb->sk->sk_hash;
2282 hash = (__force u16) skb->protocol ^
2284 hash = jhash_1word(hash, hashrnd);
2285 queue_index = map->queues[
2286 ((u64)hash * map->len) >> 32];
2288 if (unlikely(queue_index >= dev->real_num_tx_queues))
2300 static struct netdev_queue *dev_pick_tx(struct net_device *dev,
2301 struct sk_buff *skb)
2304 const struct net_device_ops *ops = dev->netdev_ops;
2306 if (dev->real_num_tx_queues == 1)
2308 else if (ops->ndo_select_queue) {
2309 queue_index = ops->ndo_select_queue(dev, skb);
2310 queue_index = dev_cap_txqueue(dev, queue_index);
2312 struct sock *sk = skb->sk;
2313 queue_index = sk_tx_queue_get(sk);
2315 if (queue_index < 0 || skb->ooo_okay ||
2316 queue_index >= dev->real_num_tx_queues) {
2317 int old_index = queue_index;
2319 queue_index = get_xps_queue(dev, skb);
2320 if (queue_index < 0)
2321 queue_index = skb_tx_hash(dev, skb);
2323 if (queue_index != old_index && sk) {
2324 struct dst_entry *dst =
2325 rcu_dereference_check(sk->sk_dst_cache, 1);
2327 if (dst && skb_dst(skb) == dst)
2328 sk_tx_queue_set(sk, queue_index);
2333 skb_set_queue_mapping(skb, queue_index);
2334 return netdev_get_tx_queue(dev, queue_index);
2337 static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
2338 struct net_device *dev,
2339 struct netdev_queue *txq)
2341 spinlock_t *root_lock = qdisc_lock(q);
2345 qdisc_skb_cb(skb)->pkt_len = skb->len;
2346 qdisc_calculate_pkt_len(skb, q);
2348 * Heuristic to force contended enqueues to serialize on a
2349 * separate lock before trying to get qdisc main lock.
2350 * This permits __QDISC_STATE_RUNNING owner to get the lock more often
2351 * and dequeue packets faster.
2353 contended = qdisc_is_running(q);
2354 if (unlikely(contended))
2355 spin_lock(&q->busylock);
2357 spin_lock(root_lock);
2358 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
2361 } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) &&
2362 qdisc_run_begin(q)) {
2364 * This is a work-conserving queue; there are no old skbs
2365 * waiting to be sent out; and the qdisc is not running -
2366 * xmit the skb directly.
2368 if (!(dev->priv_flags & IFF_XMIT_DST_RELEASE))
2371 qdisc_bstats_update(q, skb);
2373 if (sch_direct_xmit(skb, q, dev, txq, root_lock)) {
2374 if (unlikely(contended)) {
2375 spin_unlock(&q->busylock);
2382 rc = NET_XMIT_SUCCESS;
2385 rc = q->enqueue(skb, q) & NET_XMIT_MASK;
2386 if (qdisc_run_begin(q)) {
2387 if (unlikely(contended)) {
2388 spin_unlock(&q->busylock);
2394 spin_unlock(root_lock);
2395 if (unlikely(contended))
2396 spin_unlock(&q->busylock);
2400 static DEFINE_PER_CPU(int, xmit_recursion);
2401 #define RECURSION_LIMIT 10
2404 * dev_queue_xmit - transmit a buffer
2405 * @skb: buffer to transmit
2407 * Queue a buffer for transmission to a network device. The caller must
2408 * have set the device and priority and built the buffer before calling
2409 * this function. The function can be called from an interrupt.
2411 * A negative errno code is returned on a failure. A success does not
2412 * guarantee the frame will be transmitted as it may be dropped due
2413 * to congestion or traffic shaping.
2415 * -----------------------------------------------------------------------------------
2416 * I notice this method can also return errors from the queue disciplines,
2417 * including NET_XMIT_DROP, which is a positive value. So, errors can also
2420 * Regardless of the return value, the skb is consumed, so it is currently
2421 * difficult to retry a send to this method. (You can bump the ref count
2422 * before sending to hold a reference for retry if you are careful.)
2424 * When calling this method, interrupts MUST be enabled. This is because
2425 * the BH enable code must have IRQs enabled so that it will not deadlock.
2428 int dev_queue_xmit(struct sk_buff *skb)
2430 struct net_device *dev = skb->dev;
2431 struct netdev_queue *txq;
2435 /* Disable soft irqs for various locks below. Also
2436 * stops preemption for RCU.
2440 txq = dev_pick_tx(dev, skb);
2441 q = rcu_dereference_bh(txq->qdisc);
2443 #ifdef CONFIG_NET_CLS_ACT
2444 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS);
2446 trace_net_dev_queue(skb);
2448 rc = __dev_xmit_skb(skb, q, dev, txq);
2452 /* The device has no queue. Common case for software devices:
2453 loopback, all the sorts of tunnels...
2455 Really, it is unlikely that netif_tx_lock protection is necessary
2456 here. (f.e. loopback and IP tunnels are clean ignoring statistics
2458 However, it is possible, that they rely on protection
2461 Check this and shot the lock. It is not prone from deadlocks.
2462 Either shot noqueue qdisc, it is even simpler 8)
2464 if (dev->flags & IFF_UP) {
2465 int cpu = smp_processor_id(); /* ok because BHs are off */
2467 if (txq->xmit_lock_owner != cpu) {
2469 if (__this_cpu_read(xmit_recursion) > RECURSION_LIMIT)
2470 goto recursion_alert;
2472 HARD_TX_LOCK(dev, txq, cpu);
2474 if (!netif_tx_queue_stopped(txq)) {
2475 __this_cpu_inc(xmit_recursion);
2476 rc = dev_hard_start_xmit(skb, dev, txq);
2477 __this_cpu_dec(xmit_recursion);
2478 if (dev_xmit_complete(rc)) {
2479 HARD_TX_UNLOCK(dev, txq);
2483 HARD_TX_UNLOCK(dev, txq);
2484 if (net_ratelimit())
2485 printk(KERN_CRIT "Virtual device %s asks to "
2486 "queue packet!\n", dev->name);
2488 /* Recursion is detected! It is possible,
2492 if (net_ratelimit())
2493 printk(KERN_CRIT "Dead loop on virtual device "
2494 "%s, fix it urgently!\n", dev->name);
2499 rcu_read_unlock_bh();
2504 rcu_read_unlock_bh();
2507 EXPORT_SYMBOL(dev_queue_xmit);
2510 /*=======================================================================
2512 =======================================================================*/
2514 int netdev_max_backlog __read_mostly = 1000;
2515 int netdev_tstamp_prequeue __read_mostly = 1;
2516 int netdev_budget __read_mostly = 300;
2517 int weight_p __read_mostly = 64; /* old backlog weight */
2519 /* Called with irq disabled */
2520 static inline void ____napi_schedule(struct softnet_data *sd,
2521 struct napi_struct *napi)
2523 list_add_tail(&napi->poll_list, &sd->poll_list);
2524 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2528 * __skb_get_rxhash: calculate a flow hash based on src/dst addresses
2529 * and src/dst port numbers. Returns a non-zero hash number on success
2532 __u32 __skb_get_rxhash(struct sk_buff *skb)
2534 int nhoff, hash = 0, poff;
2535 struct ipv6hdr *ip6;
2538 u32 addr1, addr2, ihl;
2544 nhoff = skb_network_offset(skb);
2546 switch (skb->protocol) {
2547 case __constant_htons(ETH_P_IP):
2548 if (!pskb_may_pull(skb, sizeof(*ip) + nhoff))
2551 ip = (struct iphdr *) (skb->data + nhoff);
2552 if (ip->frag_off & htons(IP_MF | IP_OFFSET))
2555 ip_proto = ip->protocol;
2556 addr1 = (__force u32) ip->saddr;
2557 addr2 = (__force u32) ip->daddr;
2560 case __constant_htons(ETH_P_IPV6):
2561 if (!pskb_may_pull(skb, sizeof(*ip6) + nhoff))
2564 ip6 = (struct ipv6hdr *) (skb->data + nhoff);
2565 ip_proto = ip6->nexthdr;
2566 addr1 = (__force u32) ip6->saddr.s6_addr32[3];
2567 addr2 = (__force u32) ip6->daddr.s6_addr32[3];
2575 poff = proto_ports_offset(ip_proto);
2577 nhoff += ihl * 4 + poff;
2578 if (pskb_may_pull(skb, nhoff + 4)) {
2579 ports.v32 = * (__force u32 *) (skb->data + nhoff);
2580 if (ports.v16[1] < ports.v16[0])
2581 swap(ports.v16[0], ports.v16[1]);
2585 /* get a consistent hash (same value on both flow directions) */
2589 hash = jhash_3words(addr1, addr2, ports.v32, hashrnd);
2596 EXPORT_SYMBOL(__skb_get_rxhash);
2600 /* One global table that all flow-based protocols share. */
2601 struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly;
2602 EXPORT_SYMBOL(rps_sock_flow_table);
2604 static struct rps_dev_flow *
2605 set_rps_cpu(struct net_device *dev, struct sk_buff *skb,
2606 struct rps_dev_flow *rflow, u16 next_cpu)
2610 tcpu = rflow->cpu = next_cpu;
2611 if (tcpu != RPS_NO_CPU) {
2612 #ifdef CONFIG_RFS_ACCEL
2613 struct netdev_rx_queue *rxqueue;
2614 struct rps_dev_flow_table *flow_table;
2615 struct rps_dev_flow *old_rflow;
2620 /* Should we steer this flow to a different hardware queue? */
2621 if (!skb_rx_queue_recorded(skb) || !dev->rx_cpu_rmap ||
2622 !(dev->features & NETIF_F_NTUPLE))
2624 rxq_index = cpu_rmap_lookup_index(dev->rx_cpu_rmap, next_cpu);
2625 if (rxq_index == skb_get_rx_queue(skb))
2628 rxqueue = dev->_rx + rxq_index;
2629 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2632 flow_id = skb->rxhash & flow_table->mask;
2633 rc = dev->netdev_ops->ndo_rx_flow_steer(dev, skb,
2634 rxq_index, flow_id);
2638 rflow = &flow_table->flows[flow_id];
2639 rflow->cpu = next_cpu;
2641 if (old_rflow->filter == rflow->filter)
2642 old_rflow->filter = RPS_NO_FILTER;
2646 per_cpu(softnet_data, tcpu).input_queue_head;
2653 * get_rps_cpu is called from netif_receive_skb and returns the target
2654 * CPU from the RPS map of the receiving queue for a given skb.
2655 * rcu_read_lock must be held on entry.
2657 static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
2658 struct rps_dev_flow **rflowp)
2660 struct netdev_rx_queue *rxqueue;
2661 struct rps_map *map;
2662 struct rps_dev_flow_table *flow_table;
2663 struct rps_sock_flow_table *sock_flow_table;
2667 if (skb_rx_queue_recorded(skb)) {
2668 u16 index = skb_get_rx_queue(skb);
2669 if (unlikely(index >= dev->real_num_rx_queues)) {
2670 WARN_ONCE(dev->real_num_rx_queues > 1,
2671 "%s received packet on queue %u, but number "
2672 "of RX queues is %u\n",
2673 dev->name, index, dev->real_num_rx_queues);
2676 rxqueue = dev->_rx + index;
2680 map = rcu_dereference(rxqueue->rps_map);
2682 if (map->len == 1 &&
2683 !rcu_dereference_raw(rxqueue->rps_flow_table)) {
2684 tcpu = map->cpus[0];
2685 if (cpu_online(tcpu))
2689 } else if (!rcu_dereference_raw(rxqueue->rps_flow_table)) {
2693 skb_reset_network_header(skb);
2694 if (!skb_get_rxhash(skb))
2697 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2698 sock_flow_table = rcu_dereference(rps_sock_flow_table);
2699 if (flow_table && sock_flow_table) {
2701 struct rps_dev_flow *rflow;
2703 rflow = &flow_table->flows[skb->rxhash & flow_table->mask];
2706 next_cpu = sock_flow_table->ents[skb->rxhash &
2707 sock_flow_table->mask];
2710 * If the desired CPU (where last recvmsg was done) is
2711 * different from current CPU (one in the rx-queue flow
2712 * table entry), switch if one of the following holds:
2713 * - Current CPU is unset (equal to RPS_NO_CPU).
2714 * - Current CPU is offline.
2715 * - The current CPU's queue tail has advanced beyond the
2716 * last packet that was enqueued using this table entry.
2717 * This guarantees that all previous packets for the flow
2718 * have been dequeued, thus preserving in order delivery.
2720 if (unlikely(tcpu != next_cpu) &&
2721 (tcpu == RPS_NO_CPU || !cpu_online(tcpu) ||
2722 ((int)(per_cpu(softnet_data, tcpu).input_queue_head -
2723 rflow->last_qtail)) >= 0))
2724 rflow = set_rps_cpu(dev, skb, rflow, next_cpu);
2726 if (tcpu != RPS_NO_CPU && cpu_online(tcpu)) {
2734 tcpu = map->cpus[((u64) skb->rxhash * map->len) >> 32];
2736 if (cpu_online(tcpu)) {
2746 #ifdef CONFIG_RFS_ACCEL
2749 * rps_may_expire_flow - check whether an RFS hardware filter may be removed
2750 * @dev: Device on which the filter was set
2751 * @rxq_index: RX queue index
2752 * @flow_id: Flow ID passed to ndo_rx_flow_steer()
2753 * @filter_id: Filter ID returned by ndo_rx_flow_steer()
2755 * Drivers that implement ndo_rx_flow_steer() should periodically call
2756 * this function for each installed filter and remove the filters for
2757 * which it returns %true.
2759 bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index,
2760 u32 flow_id, u16 filter_id)
2762 struct netdev_rx_queue *rxqueue = dev->_rx + rxq_index;
2763 struct rps_dev_flow_table *flow_table;
2764 struct rps_dev_flow *rflow;
2769 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2770 if (flow_table && flow_id <= flow_table->mask) {
2771 rflow = &flow_table->flows[flow_id];
2772 cpu = ACCESS_ONCE(rflow->cpu);
2773 if (rflow->filter == filter_id && cpu != RPS_NO_CPU &&
2774 ((int)(per_cpu(softnet_data, cpu).input_queue_head -
2775 rflow->last_qtail) <
2776 (int)(10 * flow_table->mask)))
2782 EXPORT_SYMBOL(rps_may_expire_flow);
2784 #endif /* CONFIG_RFS_ACCEL */
2786 /* Called from hardirq (IPI) context */
2787 static void rps_trigger_softirq(void *data)
2789 struct softnet_data *sd = data;
2791 ____napi_schedule(sd, &sd->backlog);
2795 #endif /* CONFIG_RPS */
2798 * Check if this softnet_data structure is another cpu one
2799 * If yes, queue it to our IPI list and return 1
2802 static int rps_ipi_queued(struct softnet_data *sd)
2805 struct softnet_data *mysd = &__get_cpu_var(softnet_data);
2808 sd->rps_ipi_next = mysd->rps_ipi_list;
2809 mysd->rps_ipi_list = sd;
2811 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2814 #endif /* CONFIG_RPS */
2819 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
2820 * queue (may be a remote CPU queue).
2822 static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
2823 unsigned int *qtail)
2825 struct softnet_data *sd;
2826 unsigned long flags;
2828 sd = &per_cpu(softnet_data, cpu);
2830 local_irq_save(flags);
2833 if (skb_queue_len(&sd->input_pkt_queue) <= netdev_max_backlog) {
2834 if (skb_queue_len(&sd->input_pkt_queue)) {
2836 __skb_queue_tail(&sd->input_pkt_queue, skb);
2837 input_queue_tail_incr_save(sd, qtail);
2839 local_irq_restore(flags);
2840 return NET_RX_SUCCESS;
2843 /* Schedule NAPI for backlog device
2844 * We can use non atomic operation since we own the queue lock
2846 if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) {
2847 if (!rps_ipi_queued(sd))
2848 ____napi_schedule(sd, &sd->backlog);
2856 local_irq_restore(flags);
2858 atomic_long_inc(&skb->dev->rx_dropped);
2864 * netif_rx - post buffer to the network code
2865 * @skb: buffer to post
2867 * This function receives a packet from a device driver and queues it for
2868 * the upper (protocol) levels to process. It always succeeds. The buffer
2869 * may be dropped during processing for congestion control or by the
2873 * NET_RX_SUCCESS (no congestion)
2874 * NET_RX_DROP (packet was dropped)
2878 int netif_rx(struct sk_buff *skb)
2882 /* if netpoll wants it, pretend we never saw it */
2883 if (netpoll_rx(skb))
2886 if (netdev_tstamp_prequeue)
2887 net_timestamp_check(skb);
2889 trace_netif_rx(skb);
2892 struct rps_dev_flow voidflow, *rflow = &voidflow;
2898 cpu = get_rps_cpu(skb->dev, skb, &rflow);
2900 cpu = smp_processor_id();
2902 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
2910 ret = enqueue_to_backlog(skb, get_cpu(), &qtail);
2916 EXPORT_SYMBOL(netif_rx);
2918 int netif_rx_ni(struct sk_buff *skb)
2923 err = netif_rx(skb);
2924 if (local_softirq_pending())
2930 EXPORT_SYMBOL(netif_rx_ni);
2932 static void net_tx_action(struct softirq_action *h)
2934 struct softnet_data *sd = &__get_cpu_var(softnet_data);
2936 if (sd->completion_queue) {
2937 struct sk_buff *clist;
2939 local_irq_disable();
2940 clist = sd->completion_queue;
2941 sd->completion_queue = NULL;
2945 struct sk_buff *skb = clist;
2946 clist = clist->next;
2948 WARN_ON(atomic_read(&skb->users));
2949 trace_kfree_skb(skb, net_tx_action);
2954 if (sd->output_queue) {
2957 local_irq_disable();
2958 head = sd->output_queue;
2959 sd->output_queue = NULL;
2960 sd->output_queue_tailp = &sd->output_queue;
2964 struct Qdisc *q = head;
2965 spinlock_t *root_lock;
2967 head = head->next_sched;
2969 root_lock = qdisc_lock(q);
2970 if (spin_trylock(root_lock)) {
2971 smp_mb__before_clear_bit();
2972 clear_bit(__QDISC_STATE_SCHED,
2975 spin_unlock(root_lock);
2977 if (!test_bit(__QDISC_STATE_DEACTIVATED,
2979 __netif_reschedule(q);
2981 smp_mb__before_clear_bit();
2982 clear_bit(__QDISC_STATE_SCHED,
2990 #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
2991 (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
2992 /* This hook is defined here for ATM LANE */
2993 int (*br_fdb_test_addr_hook)(struct net_device *dev,
2994 unsigned char *addr) __read_mostly;
2995 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
2998 #ifdef CONFIG_NET_CLS_ACT
2999 /* TODO: Maybe we should just force sch_ingress to be compiled in
3000 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
3001 * a compare and 2 stores extra right now if we dont have it on
3002 * but have CONFIG_NET_CLS_ACT
3003 * NOTE: This doesnt stop any functionality; if you dont have
3004 * the ingress scheduler, you just cant add policies on ingress.
3007 static int ing_filter(struct sk_buff *skb, struct netdev_queue *rxq)
3009 struct net_device *dev = skb->dev;
3010 u32 ttl = G_TC_RTTL(skb->tc_verd);
3011 int result = TC_ACT_OK;
3014 if (unlikely(MAX_RED_LOOP < ttl++)) {
3015 if (net_ratelimit())
3016 pr_warning( "Redir loop detected Dropping packet (%d->%d)\n",
3017 skb->skb_iif, dev->ifindex);
3021 skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
3022 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
3025 if (q != &noop_qdisc) {
3026 spin_lock(qdisc_lock(q));
3027 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
3028 result = qdisc_enqueue_root(skb, q);
3029 spin_unlock(qdisc_lock(q));
3035 static inline struct sk_buff *handle_ing(struct sk_buff *skb,
3036 struct packet_type **pt_prev,
3037 int *ret, struct net_device *orig_dev)
3039 struct netdev_queue *rxq = rcu_dereference(skb->dev->ingress_queue);
3041 if (!rxq || rxq->qdisc == &noop_qdisc)
3045 *ret = deliver_skb(skb, *pt_prev, orig_dev);
3049 switch (ing_filter(skb, rxq)) {
3063 * netdev_rx_handler_register - register receive handler
3064 * @dev: device to register a handler for
3065 * @rx_handler: receive handler to register
3066 * @rx_handler_data: data pointer that is used by rx handler
3068 * Register a receive hander for a device. This handler will then be
3069 * called from __netif_receive_skb. A negative errno code is returned
3072 * The caller must hold the rtnl_mutex.
3074 int netdev_rx_handler_register(struct net_device *dev,
3075 rx_handler_func_t *rx_handler,
3076 void *rx_handler_data)
3080 if (dev->rx_handler)
3083 rcu_assign_pointer(dev->rx_handler_data, rx_handler_data);
3084 rcu_assign_pointer(dev->rx_handler, rx_handler);
3088 EXPORT_SYMBOL_GPL(netdev_rx_handler_register);
3091 * netdev_rx_handler_unregister - unregister receive handler
3092 * @dev: device to unregister a handler from
3094 * Unregister a receive hander from a device.
3096 * The caller must hold the rtnl_mutex.
3098 void netdev_rx_handler_unregister(struct net_device *dev)
3102 rcu_assign_pointer(dev->rx_handler, NULL);
3103 rcu_assign_pointer(dev->rx_handler_data, NULL);
3105 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister);
3107 static void vlan_on_bond_hook(struct sk_buff *skb)
3110 * Make sure ARP frames received on VLAN interfaces stacked on
3111 * bonding interfaces still make their way to any base bonding
3112 * device that may have registered for a specific ptype.
3114 if (skb->dev->priv_flags & IFF_802_1Q_VLAN &&
3115 vlan_dev_real_dev(skb->dev)->priv_flags & IFF_BONDING &&
3116 skb->protocol == htons(ETH_P_ARP)) {
3117 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
3121 skb2->dev = vlan_dev_real_dev(skb->dev);
3126 static int __netif_receive_skb(struct sk_buff *skb)
3128 struct packet_type *ptype, *pt_prev;
3129 rx_handler_func_t *rx_handler;
3130 struct net_device *orig_dev;
3131 struct net_device *null_or_dev;
3132 int ret = NET_RX_DROP;
3135 if (!netdev_tstamp_prequeue)
3136 net_timestamp_check(skb);
3138 trace_netif_receive_skb(skb);
3140 /* if we've gotten here through NAPI, check netpoll */
3141 if (netpoll_receive_skb(skb))
3145 skb->skb_iif = skb->dev->ifindex;
3146 orig_dev = skb->dev;
3148 skb_reset_network_header(skb);
3149 skb_reset_transport_header(skb);
3150 skb->mac_len = skb->network_header - skb->mac_header;
3158 __this_cpu_inc(softnet_data.processed);
3160 #ifdef CONFIG_NET_CLS_ACT
3161 if (skb->tc_verd & TC_NCLS) {
3162 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
3167 list_for_each_entry_rcu(ptype, &ptype_all, list) {
3168 if (!ptype->dev || ptype->dev == skb->dev) {
3170 ret = deliver_skb(skb, pt_prev, orig_dev);
3175 #ifdef CONFIG_NET_CLS_ACT
3176 skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
3182 rx_handler = rcu_dereference(skb->dev->rx_handler);
3184 struct net_device *prev_dev;
3187 ret = deliver_skb(skb, pt_prev, orig_dev);
3190 prev_dev = skb->dev;
3191 skb = rx_handler(skb);
3194 if (skb->dev != prev_dev)
3198 if (vlan_tx_tag_present(skb)) {
3200 ret = deliver_skb(skb, pt_prev, orig_dev);
3203 if (vlan_hwaccel_do_receive(&skb)) {
3204 ret = __netif_receive_skb(skb);
3206 } else if (unlikely(!skb))
3210 vlan_on_bond_hook(skb);
3212 /* deliver only exact match when indicated */
3213 null_or_dev = skb->deliver_no_wcard ? skb->dev : NULL;
3215 type = skb->protocol;
3216 list_for_each_entry_rcu(ptype,
3217 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
3218 if (ptype->type == type &&
3219 (ptype->dev == null_or_dev || ptype->dev == skb->dev ||
3220 ptype->dev == orig_dev)) {
3222 ret = deliver_skb(skb, pt_prev, orig_dev);
3228 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
3230 atomic_long_inc(&skb->dev->rx_dropped);
3232 /* Jamal, now you will not able to escape explaining
3233 * me how you were going to use this. :-)
3244 * netif_receive_skb - process receive buffer from network
3245 * @skb: buffer to process
3247 * netif_receive_skb() is the main receive data processing function.
3248 * It always succeeds. The buffer may be dropped during processing
3249 * for congestion control or by the protocol layers.
3251 * This function may only be called from softirq context and interrupts
3252 * should be enabled.
3254 * Return values (usually ignored):
3255 * NET_RX_SUCCESS: no congestion
3256 * NET_RX_DROP: packet was dropped
3258 int netif_receive_skb(struct sk_buff *skb)
3260 if (netdev_tstamp_prequeue)
3261 net_timestamp_check(skb);
3263 if (skb_defer_rx_timestamp(skb))
3264 return NET_RX_SUCCESS;
3268 struct rps_dev_flow voidflow, *rflow = &voidflow;
3273 cpu = get_rps_cpu(skb->dev, skb, &rflow);
3276 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
3280 ret = __netif_receive_skb(skb);
3286 return __netif_receive_skb(skb);
3289 EXPORT_SYMBOL(netif_receive_skb);
3291 /* Network device is going away, flush any packets still pending
3292 * Called with irqs disabled.
3294 static void flush_backlog(void *arg)
3296 struct net_device *dev = arg;
3297 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3298 struct sk_buff *skb, *tmp;
3301 skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) {
3302 if (skb->dev == dev) {
3303 __skb_unlink(skb, &sd->input_pkt_queue);
3305 input_queue_head_incr(sd);
3310 skb_queue_walk_safe(&sd->process_queue, skb, tmp) {
3311 if (skb->dev == dev) {
3312 __skb_unlink(skb, &sd->process_queue);
3314 input_queue_head_incr(sd);
3319 static int napi_gro_complete(struct sk_buff *skb)
3321 struct packet_type *ptype;
3322 __be16 type = skb->protocol;
3323 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
3326 if (NAPI_GRO_CB(skb)->count == 1) {
3327 skb_shinfo(skb)->gso_size = 0;
3332 list_for_each_entry_rcu(ptype, head, list) {
3333 if (ptype->type != type || ptype->dev || !ptype->gro_complete)
3336 err = ptype->gro_complete(skb);
3342 WARN_ON(&ptype->list == head);
3344 return NET_RX_SUCCESS;
3348 return netif_receive_skb(skb);
3351 inline void napi_gro_flush(struct napi_struct *napi)
3353 struct sk_buff *skb, *next;
3355 for (skb = napi->gro_list; skb; skb = next) {
3358 napi_gro_complete(skb);
3361 napi->gro_count = 0;
3362 napi->gro_list = NULL;
3364 EXPORT_SYMBOL(napi_gro_flush);
3366 enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3368 struct sk_buff **pp = NULL;
3369 struct packet_type *ptype;
3370 __be16 type = skb->protocol;
3371 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
3374 enum gro_result ret;
3376 if (!(skb->dev->features & NETIF_F_GRO) || netpoll_rx_on(skb))
3379 if (skb_is_gso(skb) || skb_has_frag_list(skb))
3383 list_for_each_entry_rcu(ptype, head, list) {
3384 if (ptype->type != type || ptype->dev || !ptype->gro_receive)
3387 skb_set_network_header(skb, skb_gro_offset(skb));
3388 mac_len = skb->network_header - skb->mac_header;
3389 skb->mac_len = mac_len;
3390 NAPI_GRO_CB(skb)->same_flow = 0;
3391 NAPI_GRO_CB(skb)->flush = 0;
3392 NAPI_GRO_CB(skb)->free = 0;
3394 pp = ptype->gro_receive(&napi->gro_list, skb);
3399 if (&ptype->list == head)
3402 same_flow = NAPI_GRO_CB(skb)->same_flow;
3403 ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
3406 struct sk_buff *nskb = *pp;
3410 napi_gro_complete(nskb);
3417 if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS)
3421 NAPI_GRO_CB(skb)->count = 1;
3422 skb_shinfo(skb)->gso_size = skb_gro_len(skb);
3423 skb->next = napi->gro_list;
3424 napi->gro_list = skb;
3428 if (skb_headlen(skb) < skb_gro_offset(skb)) {
3429 int grow = skb_gro_offset(skb) - skb_headlen(skb);
3431 BUG_ON(skb->end - skb->tail < grow);
3433 memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);
3436 skb->data_len -= grow;
3438 skb_shinfo(skb)->frags[0].page_offset += grow;
3439 skb_shinfo(skb)->frags[0].size -= grow;
3441 if (unlikely(!skb_shinfo(skb)->frags[0].size)) {
3442 put_page(skb_shinfo(skb)->frags[0].page);
3443 memmove(skb_shinfo(skb)->frags,
3444 skb_shinfo(skb)->frags + 1,
3445 --skb_shinfo(skb)->nr_frags * sizeof(skb_frag_t));
3456 EXPORT_SYMBOL(dev_gro_receive);
3458 static inline gro_result_t
3459 __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3463 for (p = napi->gro_list; p; p = p->next) {
3464 unsigned long diffs;
3466 diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev;
3467 diffs |= p->vlan_tci ^ skb->vlan_tci;
3468 diffs |= compare_ether_header(skb_mac_header(p),
3469 skb_gro_mac_header(skb));
3470 NAPI_GRO_CB(p)->same_flow = !diffs;
3471 NAPI_GRO_CB(p)->flush = 0;
3474 return dev_gro_receive(napi, skb);
3477 gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
3481 if (netif_receive_skb(skb))
3486 case GRO_MERGED_FREE:
3497 EXPORT_SYMBOL(napi_skb_finish);
3499 void skb_gro_reset_offset(struct sk_buff *skb)
3501 NAPI_GRO_CB(skb)->data_offset = 0;
3502 NAPI_GRO_CB(skb)->frag0 = NULL;
3503 NAPI_GRO_CB(skb)->frag0_len = 0;
3505 if (skb->mac_header == skb->tail &&
3506 !PageHighMem(skb_shinfo(skb)->frags[0].page)) {
3507 NAPI_GRO_CB(skb)->frag0 =
3508 page_address(skb_shinfo(skb)->frags[0].page) +
3509 skb_shinfo(skb)->frags[0].page_offset;
3510 NAPI_GRO_CB(skb)->frag0_len = skb_shinfo(skb)->frags[0].size;
3513 EXPORT_SYMBOL(skb_gro_reset_offset);
3515 gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3517 skb_gro_reset_offset(skb);
3519 return napi_skb_finish(__napi_gro_receive(napi, skb), skb);
3521 EXPORT_SYMBOL(napi_gro_receive);
3523 static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
3525 __skb_pull(skb, skb_headlen(skb));
3526 skb_reserve(skb, NET_IP_ALIGN - skb_headroom(skb));
3528 skb->dev = napi->dev;
3534 struct sk_buff *napi_get_frags(struct napi_struct *napi)
3536 struct sk_buff *skb = napi->skb;
3539 skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD);
3545 EXPORT_SYMBOL(napi_get_frags);
3547 gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb,
3553 skb->protocol = eth_type_trans(skb, skb->dev);
3555 if (ret == GRO_HELD)
3556 skb_gro_pull(skb, -ETH_HLEN);
3557 else if (netif_receive_skb(skb))
3562 case GRO_MERGED_FREE:
3563 napi_reuse_skb(napi, skb);
3572 EXPORT_SYMBOL(napi_frags_finish);
3574 struct sk_buff *napi_frags_skb(struct napi_struct *napi)
3576 struct sk_buff *skb = napi->skb;
3583 skb_reset_mac_header(skb);
3584 skb_gro_reset_offset(skb);
3586 off = skb_gro_offset(skb);
3587 hlen = off + sizeof(*eth);
3588 eth = skb_gro_header_fast(skb, off);
3589 if (skb_gro_header_hard(skb, hlen)) {
3590 eth = skb_gro_header_slow(skb, hlen, off);
3591 if (unlikely(!eth)) {
3592 napi_reuse_skb(napi, skb);
3598 skb_gro_pull(skb, sizeof(*eth));
3601 * This works because the only protocols we care about don't require
3602 * special handling. We'll fix it up properly at the end.
3604 skb->protocol = eth->h_proto;
3609 EXPORT_SYMBOL(napi_frags_skb);
3611 gro_result_t napi_gro_frags(struct napi_struct *napi)
3613 struct sk_buff *skb = napi_frags_skb(napi);
3618 return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb));
3620 EXPORT_SYMBOL(napi_gro_frags);
3623 * net_rps_action sends any pending IPI's for rps.
3624 * Note: called with local irq disabled, but exits with local irq enabled.
3626 static void net_rps_action_and_irq_enable(struct softnet_data *sd)
3629 struct softnet_data *remsd = sd->rps_ipi_list;
3632 sd->rps_ipi_list = NULL;
3636 /* Send pending IPI's to kick RPS processing on remote cpus. */
3638 struct softnet_data *next = remsd->rps_ipi_next;
3640 if (cpu_online(remsd->cpu))
3641 __smp_call_function_single(remsd->cpu,
3650 static int process_backlog(struct napi_struct *napi, int quota)
3653 struct softnet_data *sd = container_of(napi, struct softnet_data, backlog);
3656 /* Check if we have pending ipi, its better to send them now,
3657 * not waiting net_rx_action() end.
3659 if (sd->rps_ipi_list) {
3660 local_irq_disable();
3661 net_rps_action_and_irq_enable(sd);
3664 napi->weight = weight_p;
3665 local_irq_disable();
3666 while (work < quota) {
3667 struct sk_buff *skb;
3670 while ((skb = __skb_dequeue(&sd->process_queue))) {
3672 __netif_receive_skb(skb);
3673 local_irq_disable();
3674 input_queue_head_incr(sd);
3675 if (++work >= quota) {
3682 qlen = skb_queue_len(&sd->input_pkt_queue);
3684 skb_queue_splice_tail_init(&sd->input_pkt_queue,
3685 &sd->process_queue);
3687 if (qlen < quota - work) {
3689 * Inline a custom version of __napi_complete().
3690 * only current cpu owns and manipulates this napi,
3691 * and NAPI_STATE_SCHED is the only possible flag set on backlog.
3692 * we can use a plain write instead of clear_bit(),
3693 * and we dont need an smp_mb() memory barrier.
3695 list_del(&napi->poll_list);
3698 quota = work + qlen;
3708 * __napi_schedule - schedule for receive
3709 * @n: entry to schedule
3711 * The entry's receive function will be scheduled to run
3713 void __napi_schedule(struct napi_struct *n)
3715 unsigned long flags;
3717 local_irq_save(flags);
3718 ____napi_schedule(&__get_cpu_var(softnet_data), n);
3719 local_irq_restore(flags);
3721 EXPORT_SYMBOL(__napi_schedule);
3723 void __napi_complete(struct napi_struct *n)
3725 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
3726 BUG_ON(n->gro_list);
3728 list_del(&n->poll_list);
3729 smp_mb__before_clear_bit();
3730 clear_bit(NAPI_STATE_SCHED, &n->state);
3732 EXPORT_SYMBOL(__napi_complete);
3734 void napi_complete(struct napi_struct *n)
3736 unsigned long flags;
3739 * don't let napi dequeue from the cpu poll list
3740 * just in case its running on a different cpu
3742 if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state)))
3746 local_irq_save(flags);
3748 local_irq_restore(flags);
3750 EXPORT_SYMBOL(napi_complete);
3752 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
3753 int (*poll)(struct napi_struct *, int), int weight)
3755 INIT_LIST_HEAD(&napi->poll_list);
3756 napi->gro_count = 0;
3757 napi->gro_list = NULL;
3760 napi->weight = weight;
3761 list_add(&napi->dev_list, &dev->napi_list);
3763 #ifdef CONFIG_NETPOLL
3764 spin_lock_init(&napi->poll_lock);
3765 napi->poll_owner = -1;
3767 set_bit(NAPI_STATE_SCHED, &napi->state);
3769 EXPORT_SYMBOL(netif_napi_add);
3771 void netif_napi_del(struct napi_struct *napi)
3773 struct sk_buff *skb, *next;
3775 list_del_init(&napi->dev_list);
3776 napi_free_frags(napi);
3778 for (skb = napi->gro_list; skb; skb = next) {
3784 napi->gro_list = NULL;
3785 napi->gro_count = 0;
3787 EXPORT_SYMBOL(netif_napi_del);
3789 static void net_rx_action(struct softirq_action *h)
3791 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3792 unsigned long time_limit = jiffies + 2;
3793 int budget = netdev_budget;
3796 local_irq_disable();
3798 while (!list_empty(&sd->poll_list)) {
3799 struct napi_struct *n;
3802 /* If softirq window is exhuasted then punt.
3803 * Allow this to run for 2 jiffies since which will allow
3804 * an average latency of 1.5/HZ.
3806 if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
3811 /* Even though interrupts have been re-enabled, this
3812 * access is safe because interrupts can only add new
3813 * entries to the tail of this list, and only ->poll()
3814 * calls can remove this head entry from the list.
3816 n = list_first_entry(&sd->poll_list, struct napi_struct, poll_list);
3818 have = netpoll_poll_lock(n);
3822 /* This NAPI_STATE_SCHED test is for avoiding a race
3823 * with netpoll's poll_napi(). Only the entity which
3824 * obtains the lock and sees NAPI_STATE_SCHED set will
3825 * actually make the ->poll() call. Therefore we avoid
3826 * accidently calling ->poll() when NAPI is not scheduled.
3829 if (test_bit(NAPI_STATE_SCHED, &n->state)) {
3830 work = n->poll(n, weight);
3834 WARN_ON_ONCE(work > weight);
3838 local_irq_disable();
3840 /* Drivers must not modify the NAPI state if they
3841 * consume the entire weight. In such cases this code
3842 * still "owns" the NAPI instance and therefore can
3843 * move the instance around on the list at-will.
3845 if (unlikely(work == weight)) {
3846 if (unlikely(napi_disable_pending(n))) {
3849 local_irq_disable();
3851 list_move_tail(&n->poll_list, &sd->poll_list);
3854 netpoll_poll_unlock(have);
3857 net_rps_action_and_irq_enable(sd);
3859 #ifdef CONFIG_NET_DMA
3861 * There may not be any more sk_buffs coming right now, so push
3862 * any pending DMA copies to hardware
3864 dma_issue_pending_all();
3871 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3875 static gifconf_func_t *gifconf_list[NPROTO];
3878 * register_gifconf - register a SIOCGIF handler
3879 * @family: Address family
3880 * @gifconf: Function handler
3882 * Register protocol dependent address dumping routines. The handler
3883 * that is passed must not be freed or reused until it has been replaced
3884 * by another handler.
3886 int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
3888 if (family >= NPROTO)
3890 gifconf_list[family] = gifconf;
3893 EXPORT_SYMBOL(register_gifconf);
3897 * Map an interface index to its name (SIOCGIFNAME)
3901 * We need this ioctl for efficient implementation of the
3902 * if_indextoname() function required by the IPv6 API. Without
3903 * it, we would have to search all the interfaces to find a
3907 static int dev_ifname(struct net *net, struct ifreq __user *arg)
3909 struct net_device *dev;
3913 * Fetch the caller's info block.
3916 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
3920 dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex);
3926 strcpy(ifr.ifr_name, dev->name);
3929 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
3935 * Perform a SIOCGIFCONF call. This structure will change
3936 * size eventually, and there is nothing I can do about it.
3937 * Thus we will need a 'compatibility mode'.
3940 static int dev_ifconf(struct net *net, char __user *arg)
3943 struct net_device *dev;
3950 * Fetch the caller's info block.
3953 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
3960 * Loop over the interfaces, and write an info block for each.
3964 for_each_netdev(net, dev) {
3965 for (i = 0; i < NPROTO; i++) {
3966 if (gifconf_list[i]) {
3969 done = gifconf_list[i](dev, NULL, 0);
3971 done = gifconf_list[i](dev, pos + total,
3981 * All done. Write the updated control block back to the caller.
3983 ifc.ifc_len = total;
3986 * Both BSD and Solaris return 0 here, so we do too.
3988 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
3991 #ifdef CONFIG_PROC_FS
3993 * This is invoked by the /proc filesystem handler to display a device
3996 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
3999 struct net *net = seq_file_net(seq);
4001 struct net_device *dev;
4005 return SEQ_START_TOKEN;
4008 for_each_netdev_rcu(net, dev)
4015 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4017 struct net_device *dev = v;
4019 if (v == SEQ_START_TOKEN)
4020 dev = first_net_device_rcu(seq_file_net(seq));
4022 dev = next_net_device_rcu(dev);
4028 void dev_seq_stop(struct seq_file *seq, void *v)
4034 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
4036 struct rtnl_link_stats64 temp;
4037 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
4039 seq_printf(seq, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu "
4040 "%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n",
4041 dev->name, stats->rx_bytes, stats->rx_packets,
4043 stats->rx_dropped + stats->rx_missed_errors,
4044 stats->rx_fifo_errors,
4045 stats->rx_length_errors + stats->rx_over_errors +
4046 stats->rx_crc_errors + stats->rx_frame_errors,
4047 stats->rx_compressed, stats->multicast,
4048 stats->tx_bytes, stats->tx_packets,
4049 stats->tx_errors, stats->tx_dropped,
4050 stats->tx_fifo_errors, stats->collisions,
4051 stats->tx_carrier_errors +
4052 stats->tx_aborted_errors +
4053 stats->tx_window_errors +
4054 stats->tx_heartbeat_errors,
4055 stats->tx_compressed);
4059 * Called from the PROCfs module. This now uses the new arbitrary sized
4060 * /proc/net interface to create /proc/net/dev
4062 static int dev_seq_show(struct seq_file *seq, void *v)
4064 if (v == SEQ_START_TOKEN)
4065 seq_puts(seq, "Inter-| Receive "
4067 " face |bytes packets errs drop fifo frame "
4068 "compressed multicast|bytes packets errs "
4069 "drop fifo colls carrier compressed\n");
4071 dev_seq_printf_stats(seq, v);
4075 static struct softnet_data *softnet_get_online(loff_t *pos)
4077 struct softnet_data *sd = NULL;
4079 while (*pos < nr_cpu_ids)
4080 if (cpu_online(*pos)) {
4081 sd = &per_cpu(softnet_data, *pos);
4088 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
4090 return softnet_get_online(pos);
4093 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4096 return softnet_get_online(pos);
4099 static void softnet_seq_stop(struct seq_file *seq, void *v)
4103 static int softnet_seq_show(struct seq_file *seq, void *v)
4105 struct softnet_data *sd = v;
4107 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
4108 sd->processed, sd->dropped, sd->time_squeeze, 0,
4109 0, 0, 0, 0, /* was fastroute */
4110 sd->cpu_collision, sd->received_rps);
4114 static const struct seq_operations dev_seq_ops = {
4115 .start = dev_seq_start,
4116 .next = dev_seq_next,
4117 .stop = dev_seq_stop,
4118 .show = dev_seq_show,
4121 static int dev_seq_open(struct inode *inode, struct file *file)
4123 return seq_open_net(inode, file, &dev_seq_ops,
4124 sizeof(struct seq_net_private));
4127 static const struct file_operations dev_seq_fops = {
4128 .owner = THIS_MODULE,
4129 .open = dev_seq_open,
4131 .llseek = seq_lseek,
4132 .release = seq_release_net,
4135 static const struct seq_operations softnet_seq_ops = {
4136 .start = softnet_seq_start,
4137 .next = softnet_seq_next,
4138 .stop = softnet_seq_stop,
4139 .show = softnet_seq_show,
4142 static int softnet_seq_open(struct inode *inode, struct file *file)
4144 return seq_open(file, &softnet_seq_ops);
4147 static const struct file_operations softnet_seq_fops = {
4148 .owner = THIS_MODULE,
4149 .open = softnet_seq_open,
4151 .llseek = seq_lseek,
4152 .release = seq_release,
4155 static void *ptype_get_idx(loff_t pos)
4157 struct packet_type *pt = NULL;
4161 list_for_each_entry_rcu(pt, &ptype_all, list) {
4167 for (t = 0; t < PTYPE_HASH_SIZE; t++) {
4168 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
4177 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
4181 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
4184 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4186 struct packet_type *pt;
4187 struct list_head *nxt;
4191 if (v == SEQ_START_TOKEN)
4192 return ptype_get_idx(0);
4195 nxt = pt->list.next;
4196 if (pt->type == htons(ETH_P_ALL)) {
4197 if (nxt != &ptype_all)
4200 nxt = ptype_base[0].next;
4202 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
4204 while (nxt == &ptype_base[hash]) {
4205 if (++hash >= PTYPE_HASH_SIZE)
4207 nxt = ptype_base[hash].next;
4210 return list_entry(nxt, struct packet_type, list);
4213 static void ptype_seq_stop(struct seq_file *seq, void *v)
4219 static int ptype_seq_show(struct seq_file *seq, void *v)
4221 struct packet_type *pt = v;
4223 if (v == SEQ_START_TOKEN)
4224 seq_puts(seq, "Type Device Function\n");
4225 else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
4226 if (pt->type == htons(ETH_P_ALL))
4227 seq_puts(seq, "ALL ");
4229 seq_printf(seq, "%04x", ntohs(pt->type));
4231 seq_printf(seq, " %-8s %pF\n",
4232 pt->dev ? pt->dev->name : "", pt->func);
4238 static const struct seq_operations ptype_seq_ops = {
4239 .start = ptype_seq_start,
4240 .next = ptype_seq_next,
4241 .stop = ptype_seq_stop,
4242 .show = ptype_seq_show,
4245 static int ptype_seq_open(struct inode *inode, struct file *file)
4247 return seq_open_net(inode, file, &ptype_seq_ops,
4248 sizeof(struct seq_net_private));
4251 static const struct file_operations ptype_seq_fops = {
4252 .owner = THIS_MODULE,
4253 .open = ptype_seq_open,
4255 .llseek = seq_lseek,
4256 .release = seq_release_net,
4260 static int __net_init dev_proc_net_init(struct net *net)
4264 if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
4266 if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
4268 if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
4271 if (wext_proc_init(net))
4277 proc_net_remove(net, "ptype");
4279 proc_net_remove(net, "softnet_stat");
4281 proc_net_remove(net, "dev");
4285 static void __net_exit dev_proc_net_exit(struct net *net)
4287 wext_proc_exit(net);
4289 proc_net_remove(net, "ptype");
4290 proc_net_remove(net, "softnet_stat");
4291 proc_net_remove(net, "dev");
4294 static struct pernet_operations __net_initdata dev_proc_ops = {
4295 .init = dev_proc_net_init,
4296 .exit = dev_proc_net_exit,
4299 static int __init dev_proc_init(void)
4301 return register_pernet_subsys(&dev_proc_ops);
4304 #define dev_proc_init() 0
4305 #endif /* CONFIG_PROC_FS */
4309 * netdev_set_master - set up master pointer
4310 * @slave: slave device
4311 * @master: new master device
4313 * Changes the master device of the slave. Pass %NULL to break the
4314 * bonding. The caller must hold the RTNL semaphore. On a failure
4315 * a negative errno code is returned. On success the reference counts
4316 * are adjusted and the function returns zero.
4318 int netdev_set_master(struct net_device *slave, struct net_device *master)
4320 struct net_device *old = slave->master;
4330 slave->master = master;
4338 EXPORT_SYMBOL(netdev_set_master);
4341 * netdev_set_bond_master - set up bonding master/slave pair
4342 * @slave: slave device
4343 * @master: new master device
4345 * Changes the master device of the slave. Pass %NULL to break the
4346 * bonding. The caller must hold the RTNL semaphore. On a failure
4347 * a negative errno code is returned. On success %RTM_NEWLINK is sent
4348 * to the routing socket and the function returns zero.
4350 int netdev_set_bond_master(struct net_device *slave, struct net_device *master)
4356 err = netdev_set_master(slave, master);
4360 slave->flags |= IFF_SLAVE;
4362 slave->flags &= ~IFF_SLAVE;
4364 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
4367 EXPORT_SYMBOL(netdev_set_bond_master);
4369 static void dev_change_rx_flags(struct net_device *dev, int flags)
4371 const struct net_device_ops *ops = dev->netdev_ops;
4373 if ((dev->flags & IFF_UP) && ops->ndo_change_rx_flags)
4374 ops->ndo_change_rx_flags(dev, flags);
4377 static int __dev_set_promiscuity(struct net_device *dev, int inc)
4379 unsigned short old_flags = dev->flags;
4385 dev->flags |= IFF_PROMISC;
4386 dev->promiscuity += inc;
4387 if (dev->promiscuity == 0) {
4390 * If inc causes overflow, untouch promisc and return error.
4393 dev->flags &= ~IFF_PROMISC;
4395 dev->promiscuity -= inc;
4396 printk(KERN_WARNING "%s: promiscuity touches roof, "
4397 "set promiscuity failed, promiscuity feature "
4398 "of device might be broken.\n", dev->name);
4402 if (dev->flags != old_flags) {
4403 printk(KERN_INFO "device %s %s promiscuous mode\n",
4404 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
4406 if (audit_enabled) {
4407 current_uid_gid(&uid, &gid);
4408 audit_log(current->audit_context, GFP_ATOMIC,
4409 AUDIT_ANOM_PROMISCUOUS,
4410 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
4411 dev->name, (dev->flags & IFF_PROMISC),
4412 (old_flags & IFF_PROMISC),
4413 audit_get_loginuid(current),
4415 audit_get_sessionid(current));
4418 dev_change_rx_flags(dev, IFF_PROMISC);
4424 * dev_set_promiscuity - update promiscuity count on a device
4428 * Add or remove promiscuity from a device. While the count in the device
4429 * remains above zero the interface remains promiscuous. Once it hits zero
4430 * the device reverts back to normal filtering operation. A negative inc
4431 * value is used to drop promiscuity on the device.
4432 * Return 0 if successful or a negative errno code on error.
4434 int dev_set_promiscuity(struct net_device *dev, int inc)
4436 unsigned short old_flags = dev->flags;
4439 err = __dev_set_promiscuity(dev, inc);
4442 if (dev->flags != old_flags)
4443 dev_set_rx_mode(dev);
4446 EXPORT_SYMBOL(dev_set_promiscuity);
4449 * dev_set_allmulti - update allmulti count on a device
4453 * Add or remove reception of all multicast frames to a device. While the
4454 * count in the device remains above zero the interface remains listening
4455 * to all interfaces. Once it hits zero the device reverts back to normal
4456 * filtering operation. A negative @inc value is used to drop the counter
4457 * when releasing a resource needing all multicasts.
4458 * Return 0 if successful or a negative errno code on error.
4461 int dev_set_allmulti(struct net_device *dev, int inc)
4463 unsigned short old_flags = dev->flags;
4467 dev->flags |= IFF_ALLMULTI;
4468 dev->allmulti += inc;
4469 if (dev->allmulti == 0) {
4472 * If inc causes overflow, untouch allmulti and return error.
4475 dev->flags &= ~IFF_ALLMULTI;
4477 dev->allmulti -= inc;
4478 printk(KERN_WARNING "%s: allmulti touches roof, "
4479 "set allmulti failed, allmulti feature of "
4480 "device might be broken.\n", dev->name);
4484 if (dev->flags ^ old_flags) {
4485 dev_change_rx_flags(dev, IFF_ALLMULTI);
4486 dev_set_rx_mode(dev);
4490 EXPORT_SYMBOL(dev_set_allmulti);
4493 * Upload unicast and multicast address lists to device and
4494 * configure RX filtering. When the device doesn't support unicast
4495 * filtering it is put in promiscuous mode while unicast addresses
4498 void __dev_set_rx_mode(struct net_device *dev)
4500 const struct net_device_ops *ops = dev->netdev_ops;
4502 /* dev_open will call this function so the list will stay sane. */
4503 if (!(dev->flags&IFF_UP))
4506 if (!netif_device_present(dev))
4509 if (ops->ndo_set_rx_mode)
4510 ops->ndo_set_rx_mode(dev);
4512 /* Unicast addresses changes may only happen under the rtnl,
4513 * therefore calling __dev_set_promiscuity here is safe.
4515 if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
4516 __dev_set_promiscuity(dev, 1);
4517 dev->uc_promisc = 1;
4518 } else if (netdev_uc_empty(dev) && dev->uc_promisc) {
4519 __dev_set_promiscuity(dev, -1);
4520 dev->uc_promisc = 0;
4523 if (ops->ndo_set_multicast_list)
4524 ops->ndo_set_multicast_list(dev);
4528 void dev_set_rx_mode(struct net_device *dev)
4530 netif_addr_lock_bh(dev);
4531 __dev_set_rx_mode(dev);
4532 netif_addr_unlock_bh(dev);
4536 * dev_get_flags - get flags reported to userspace
4539 * Get the combination of flag bits exported through APIs to userspace.
4541 unsigned dev_get_flags(const struct net_device *dev)
4545 flags = (dev->flags & ~(IFF_PROMISC |
4550 (dev->gflags & (IFF_PROMISC |
4553 if (netif_running(dev)) {
4554 if (netif_oper_up(dev))
4555 flags |= IFF_RUNNING;
4556 if (netif_carrier_ok(dev))
4557 flags |= IFF_LOWER_UP;
4558 if (netif_dormant(dev))
4559 flags |= IFF_DORMANT;
4564 EXPORT_SYMBOL(dev_get_flags);
4566 int __dev_change_flags(struct net_device *dev, unsigned int flags)
4568 int old_flags = dev->flags;
4574 * Set the flags on our device.
4577 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
4578 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
4580 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
4584 * Load in the correct multicast list now the flags have changed.
4587 if ((old_flags ^ flags) & IFF_MULTICAST)
4588 dev_change_rx_flags(dev, IFF_MULTICAST);
4590 dev_set_rx_mode(dev);
4593 * Have we downed the interface. We handle IFF_UP ourselves
4594 * according to user attempts to set it, rather than blindly
4599 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
4600 ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev);
4603 dev_set_rx_mode(dev);
4606 if ((flags ^ dev->gflags) & IFF_PROMISC) {
4607 int inc = (flags & IFF_PROMISC) ? 1 : -1;
4609 dev->gflags ^= IFF_PROMISC;
4610 dev_set_promiscuity(dev, inc);
4613 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
4614 is important. Some (broken) drivers set IFF_PROMISC, when
4615 IFF_ALLMULTI is requested not asking us and not reporting.
4617 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
4618 int inc = (flags & IFF_ALLMULTI) ? 1 : -1;
4620 dev->gflags ^= IFF_ALLMULTI;
4621 dev_set_allmulti(dev, inc);
4627 void __dev_notify_flags(struct net_device *dev, unsigned int old_flags)
4629 unsigned int changes = dev->flags ^ old_flags;
4631 if (changes & IFF_UP) {
4632 if (dev->flags & IFF_UP)
4633 call_netdevice_notifiers(NETDEV_UP, dev);
4635 call_netdevice_notifiers(NETDEV_DOWN, dev);
4638 if (dev->flags & IFF_UP &&
4639 (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE)))
4640 call_netdevice_notifiers(NETDEV_CHANGE, dev);
4644 * dev_change_flags - change device settings
4646 * @flags: device state flags
4648 * Change settings on device based state flags. The flags are
4649 * in the userspace exported format.
4651 int dev_change_flags(struct net_device *dev, unsigned flags)
4654 int old_flags = dev->flags;
4656 ret = __dev_change_flags(dev, flags);
4660 changes = old_flags ^ dev->flags;
4662 rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
4664 __dev_notify_flags(dev, old_flags);
4667 EXPORT_SYMBOL(dev_change_flags);
4670 * dev_set_mtu - Change maximum transfer unit
4672 * @new_mtu: new transfer unit
4674 * Change the maximum transfer size of the network device.
4676 int dev_set_mtu(struct net_device *dev, int new_mtu)
4678 const struct net_device_ops *ops = dev->netdev_ops;
4681 if (new_mtu == dev->mtu)
4684 /* MTU must be positive. */
4688 if (!netif_device_present(dev))
4692 if (ops->ndo_change_mtu)
4693 err = ops->ndo_change_mtu(dev, new_mtu);
4697 if (!err && dev->flags & IFF_UP)
4698 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
4701 EXPORT_SYMBOL(dev_set_mtu);
4704 * dev_set_group - Change group this device belongs to
4706 * @new_group: group this device should belong to
4708 void dev_set_group(struct net_device *dev, int new_group)
4710 dev->group = new_group;
4712 EXPORT_SYMBOL(dev_set_group);
4715 * dev_set_mac_address - Change Media Access Control Address
4719 * Change the hardware (MAC) address of the device
4721 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
4723 const struct net_device_ops *ops = dev->netdev_ops;
4726 if (!ops->ndo_set_mac_address)
4728 if (sa->sa_family != dev->type)
4730 if (!netif_device_present(dev))
4732 err = ops->ndo_set_mac_address(dev, sa);
4734 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4737 EXPORT_SYMBOL(dev_set_mac_address);
4740 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
4742 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
4745 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
4751 case SIOCGIFFLAGS: /* Get interface flags */
4752 ifr->ifr_flags = (short) dev_get_flags(dev);
4755 case SIOCGIFMETRIC: /* Get the metric on the interface
4756 (currently unused) */
4757 ifr->ifr_metric = 0;
4760 case SIOCGIFMTU: /* Get the MTU of a device */
4761 ifr->ifr_mtu = dev->mtu;
4766 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
4768 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
4769 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4770 ifr->ifr_hwaddr.sa_family = dev->type;
4778 ifr->ifr_map.mem_start = dev->mem_start;
4779 ifr->ifr_map.mem_end = dev->mem_end;
4780 ifr->ifr_map.base_addr = dev->base_addr;
4781 ifr->ifr_map.irq = dev->irq;
4782 ifr->ifr_map.dma = dev->dma;
4783 ifr->ifr_map.port = dev->if_port;
4787 ifr->ifr_ifindex = dev->ifindex;
4791 ifr->ifr_qlen = dev->tx_queue_len;
4795 /* dev_ioctl() should ensure this case
4807 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
4809 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
4812 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
4813 const struct net_device_ops *ops;
4818 ops = dev->netdev_ops;
4821 case SIOCSIFFLAGS: /* Set interface flags */
4822 return dev_change_flags(dev, ifr->ifr_flags);
4824 case SIOCSIFMETRIC: /* Set the metric on the interface
4825 (currently unused) */
4828 case SIOCSIFMTU: /* Set the MTU of a device */
4829 return dev_set_mtu(dev, ifr->ifr_mtu);
4832 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
4834 case SIOCSIFHWBROADCAST:
4835 if (ifr->ifr_hwaddr.sa_family != dev->type)
4837 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
4838 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4839 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4843 if (ops->ndo_set_config) {
4844 if (!netif_device_present(dev))
4846 return ops->ndo_set_config(dev, &ifr->ifr_map);
4851 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
4852 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4854 if (!netif_device_present(dev))
4856 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
4859 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
4860 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4862 if (!netif_device_present(dev))
4864 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
4867 if (ifr->ifr_qlen < 0)
4869 dev->tx_queue_len = ifr->ifr_qlen;
4873 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
4874 return dev_change_name(dev, ifr->ifr_newname);
4877 * Unknown or private ioctl
4880 if ((cmd >= SIOCDEVPRIVATE &&
4881 cmd <= SIOCDEVPRIVATE + 15) ||
4882 cmd == SIOCBONDENSLAVE ||
4883 cmd == SIOCBONDRELEASE ||
4884 cmd == SIOCBONDSETHWADDR ||
4885 cmd == SIOCBONDSLAVEINFOQUERY ||
4886 cmd == SIOCBONDINFOQUERY ||
4887 cmd == SIOCBONDCHANGEACTIVE ||
4888 cmd == SIOCGMIIPHY ||
4889 cmd == SIOCGMIIREG ||
4890 cmd == SIOCSMIIREG ||
4891 cmd == SIOCBRADDIF ||
4892 cmd == SIOCBRDELIF ||
4893 cmd == SIOCSHWTSTAMP ||
4894 cmd == SIOCWANDEV) {
4896 if (ops->ndo_do_ioctl) {
4897 if (netif_device_present(dev))
4898 err = ops->ndo_do_ioctl(dev, ifr, cmd);
4910 * This function handles all "interface"-type I/O control requests. The actual
4911 * 'doing' part of this is dev_ifsioc above.
4915 * dev_ioctl - network device ioctl
4916 * @net: the applicable net namespace
4917 * @cmd: command to issue
4918 * @arg: pointer to a struct ifreq in user space
4920 * Issue ioctl functions to devices. This is normally called by the
4921 * user space syscall interfaces but can sometimes be useful for
4922 * other purposes. The return value is the return from the syscall if
4923 * positive or a negative errno code on error.
4926 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
4932 /* One special case: SIOCGIFCONF takes ifconf argument
4933 and requires shared lock, because it sleeps writing
4937 if (cmd == SIOCGIFCONF) {
4939 ret = dev_ifconf(net, (char __user *) arg);
4943 if (cmd == SIOCGIFNAME)
4944 return dev_ifname(net, (struct ifreq __user *)arg);
4946 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
4949 ifr.ifr_name[IFNAMSIZ-1] = 0;
4951 colon = strchr(ifr.ifr_name, ':');
4956 * See which interface the caller is talking about.
4961 * These ioctl calls:
4962 * - can be done by all.
4963 * - atomic and do not require locking.
4974 dev_load(net, ifr.ifr_name);
4976 ret = dev_ifsioc_locked(net, &ifr, cmd);
4981 if (copy_to_user(arg, &ifr,
4982 sizeof(struct ifreq)))
4988 dev_load(net, ifr.ifr_name);
4990 ret = dev_ethtool(net, &ifr);
4995 if (copy_to_user(arg, &ifr,
4996 sizeof(struct ifreq)))
5002 * These ioctl calls:
5003 * - require superuser power.
5004 * - require strict serialization.
5010 if (!capable(CAP_NET_ADMIN))
5012 dev_load(net, ifr.ifr_name);
5014 ret = dev_ifsioc(net, &ifr, cmd);
5019 if (copy_to_user(arg, &ifr,
5020 sizeof(struct ifreq)))
5026 * These ioctl calls:
5027 * - require superuser power.
5028 * - require strict serialization.
5029 * - do not return a value
5039 case SIOCSIFHWBROADCAST:
5042 case SIOCBONDENSLAVE:
5043 case SIOCBONDRELEASE:
5044 case SIOCBONDSETHWADDR:
5045 case SIOCBONDCHANGEACTIVE:
5049 if (!capable(CAP_NET_ADMIN))
5052 case SIOCBONDSLAVEINFOQUERY:
5053 case SIOCBONDINFOQUERY:
5054 dev_load(net, ifr.ifr_name);
5056 ret = dev_ifsioc(net, &ifr, cmd);
5061 /* Get the per device memory space. We can add this but
5062 * currently do not support it */
5064 /* Set the per device memory buffer space.
5065 * Not applicable in our case */
5070 * Unknown or private ioctl.
5073 if (cmd == SIOCWANDEV ||
5074 (cmd >= SIOCDEVPRIVATE &&
5075 cmd <= SIOCDEVPRIVATE + 15)) {
5076 dev_load(net, ifr.ifr_name);
5078 ret = dev_ifsioc(net, &ifr, cmd);
5080 if (!ret && copy_to_user(arg, &ifr,
5081 sizeof(struct ifreq)))
5085 /* Take care of Wireless Extensions */
5086 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
5087 return wext_handle_ioctl(net, &ifr, cmd, arg);
5094 * dev_new_index - allocate an ifindex
5095 * @net: the applicable net namespace
5097 * Returns a suitable unique value for a new device interface
5098 * number. The caller must hold the rtnl semaphore or the
5099 * dev_base_lock to be sure it remains unique.
5101 static int dev_new_index(struct net *net)
5107 if (!__dev_get_by_index(net, ifindex))
5112 /* Delayed registration/unregisteration */
5113 static LIST_HEAD(net_todo_list);
5115 static void net_set_todo(struct net_device *dev)
5117 list_add_tail(&dev->todo_list, &net_todo_list);
5120 static void rollback_registered_many(struct list_head *head)
5122 struct net_device *dev, *tmp;
5124 BUG_ON(dev_boot_phase);
5127 list_for_each_entry_safe(dev, tmp, head, unreg_list) {
5128 /* Some devices call without registering
5129 * for initialization unwind. Remove those
5130 * devices and proceed with the remaining.
5132 if (dev->reg_state == NETREG_UNINITIALIZED) {
5133 pr_debug("unregister_netdevice: device %s/%p never "
5134 "was registered\n", dev->name, dev);
5137 list_del(&dev->unreg_list);
5141 BUG_ON(dev->reg_state != NETREG_REGISTERED);
5144 /* If device is running, close it first. */
5145 dev_close_many(head);
5147 list_for_each_entry(dev, head, unreg_list) {
5148 /* And unlink it from device chain. */
5149 unlist_netdevice(dev);
5151 dev->reg_state = NETREG_UNREGISTERING;
5156 list_for_each_entry(dev, head, unreg_list) {
5157 /* Shutdown queueing discipline. */
5161 /* Notify protocols, that we are about to destroy
5162 this device. They should clean all the things.
5164 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5166 if (!dev->rtnl_link_ops ||
5167 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
5168 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
5171 * Flush the unicast and multicast chains
5176 if (dev->netdev_ops->ndo_uninit)
5177 dev->netdev_ops->ndo_uninit(dev);
5179 /* Notifier chain MUST detach us from master device. */
5180 WARN_ON(dev->master);
5182 /* Remove entries from kobject tree */
5183 netdev_unregister_kobject(dev);
5186 /* Process any work delayed until the end of the batch */
5187 dev = list_first_entry(head, struct net_device, unreg_list);
5188 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
5192 list_for_each_entry(dev, head, unreg_list)
5196 static void rollback_registered(struct net_device *dev)
5200 list_add(&dev->unreg_list, &single);
5201 rollback_registered_many(&single);
5205 u32 netdev_fix_features(struct net_device *dev, u32 features)
5207 /* Fix illegal checksum combinations */
5208 if ((features & NETIF_F_HW_CSUM) &&
5209 (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5210 netdev_info(dev, "mixed HW and IP checksum settings.\n");
5211 features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
5214 if ((features & NETIF_F_NO_CSUM) &&
5215 (features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5216 netdev_info(dev, "mixed no checksumming and other settings.\n");
5217 features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
5220 /* Fix illegal SG+CSUM combinations. */
5221 if ((features & NETIF_F_SG) &&
5222 !(features & NETIF_F_ALL_CSUM)) {
5224 "Dropping NETIF_F_SG since no checksum feature.\n");
5225 features &= ~NETIF_F_SG;
5228 /* TSO requires that SG is present as well. */
5229 if ((features & NETIF_F_TSO) && !(features & NETIF_F_SG)) {
5230 netdev_info(dev, "Dropping NETIF_F_TSO since no SG feature.\n");
5231 features &= ~NETIF_F_TSO;
5234 /* Software GSO depends on SG. */
5235 if ((features & NETIF_F_GSO) && !(features & NETIF_F_SG)) {
5236 netdev_info(dev, "Dropping NETIF_F_GSO since no SG feature.\n");
5237 features &= ~NETIF_F_GSO;
5240 /* UFO needs SG and checksumming */
5241 if (features & NETIF_F_UFO) {
5242 /* maybe split UFO into V4 and V6? */
5243 if (!((features & NETIF_F_GEN_CSUM) ||
5244 (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))
5245 == (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5247 "Dropping NETIF_F_UFO since no checksum offload features.\n");
5248 features &= ~NETIF_F_UFO;
5251 if (!(features & NETIF_F_SG)) {
5253 "Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n");
5254 features &= ~NETIF_F_UFO;
5260 EXPORT_SYMBOL(netdev_fix_features);
5262 void netdev_update_features(struct net_device *dev)
5267 features = netdev_get_wanted_features(dev);
5269 if (dev->netdev_ops->ndo_fix_features)
5270 features = dev->netdev_ops->ndo_fix_features(dev, features);
5272 /* driver might be less strict about feature dependencies */
5273 features = netdev_fix_features(dev, features);
5275 if (dev->features == features)
5278 netdev_info(dev, "Features changed: 0x%08x -> 0x%08x\n",
5279 dev->features, features);
5281 if (dev->netdev_ops->ndo_set_features)
5282 err = dev->netdev_ops->ndo_set_features(dev, features);
5285 dev->features = features;
5288 "set_features() failed (%d); wanted 0x%08x, left 0x%08x\n",
5289 err, features, dev->features);
5291 EXPORT_SYMBOL(netdev_update_features);
5294 * netif_stacked_transfer_operstate - transfer operstate
5295 * @rootdev: the root or lower level device to transfer state from
5296 * @dev: the device to transfer operstate to
5298 * Transfer operational state from root to device. This is normally
5299 * called when a stacking relationship exists between the root
5300 * device and the device(a leaf device).
5302 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
5303 struct net_device *dev)
5305 if (rootdev->operstate == IF_OPER_DORMANT)
5306 netif_dormant_on(dev);
5308 netif_dormant_off(dev);
5310 if (netif_carrier_ok(rootdev)) {
5311 if (!netif_carrier_ok(dev))
5312 netif_carrier_on(dev);
5314 if (netif_carrier_ok(dev))
5315 netif_carrier_off(dev);
5318 EXPORT_SYMBOL(netif_stacked_transfer_operstate);
5321 static int netif_alloc_rx_queues(struct net_device *dev)
5323 unsigned int i, count = dev->num_rx_queues;
5324 struct netdev_rx_queue *rx;
5328 rx = kcalloc(count, sizeof(struct netdev_rx_queue), GFP_KERNEL);
5330 pr_err("netdev: Unable to allocate %u rx queues.\n", count);
5335 for (i = 0; i < count; i++)
5341 static void netdev_init_one_queue(struct net_device *dev,
5342 struct netdev_queue *queue, void *_unused)
5344 /* Initialize queue lock */
5345 spin_lock_init(&queue->_xmit_lock);
5346 netdev_set_xmit_lockdep_class(&queue->_xmit_lock, dev->type);
5347 queue->xmit_lock_owner = -1;
5348 netdev_queue_numa_node_write(queue, NUMA_NO_NODE);
5352 static int netif_alloc_netdev_queues(struct net_device *dev)
5354 unsigned int count = dev->num_tx_queues;
5355 struct netdev_queue *tx;
5359 tx = kcalloc(count, sizeof(struct netdev_queue), GFP_KERNEL);
5361 pr_err("netdev: Unable to allocate %u tx queues.\n",
5367 netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
5368 spin_lock_init(&dev->tx_global_lock);
5374 * register_netdevice - register a network device
5375 * @dev: device to register
5377 * Take a completed network device structure and add it to the kernel
5378 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5379 * chain. 0 is returned on success. A negative errno code is returned
5380 * on a failure to set up the device, or if the name is a duplicate.
5382 * Callers must hold the rtnl semaphore. You may want
5383 * register_netdev() instead of this.
5386 * The locking appears insufficient to guarantee two parallel registers
5387 * will not get the same name.
5390 int register_netdevice(struct net_device *dev)
5393 struct net *net = dev_net(dev);
5395 BUG_ON(dev_boot_phase);
5400 /* When net_device's are persistent, this will be fatal. */
5401 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
5404 spin_lock_init(&dev->addr_list_lock);
5405 netdev_set_addr_lockdep_class(dev);
5409 /* Init, if this function is available */
5410 if (dev->netdev_ops->ndo_init) {
5411 ret = dev->netdev_ops->ndo_init(dev);
5419 ret = dev_get_valid_name(dev, dev->name, 0);
5423 dev->ifindex = dev_new_index(net);
5424 if (dev->iflink == -1)
5425 dev->iflink = dev->ifindex;
5427 /* Transfer changeable features to wanted_features and enable
5428 * software offloads (GSO and GRO).
5430 dev->hw_features |= NETIF_F_SOFT_FEATURES;
5431 dev->features |= NETIF_F_SOFT_FEATURES;
5432 dev->wanted_features = dev->features & dev->hw_features;
5434 /* Avoid warning from netdev_fix_features() for GSO without SG */
5435 if (!(dev->wanted_features & NETIF_F_SG)) {
5436 dev->wanted_features &= ~NETIF_F_GSO;
5437 dev->features &= ~NETIF_F_GSO;
5440 /* Enable GRO and NETIF_F_HIGHDMA for vlans by default,
5441 * vlan_dev_init() will do the dev->features check, so these features
5442 * are enabled only if supported by underlying device.
5444 dev->vlan_features |= (NETIF_F_GRO | NETIF_F_HIGHDMA);
5446 ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
5447 ret = notifier_to_errno(ret);
5451 ret = netdev_register_kobject(dev);
5454 dev->reg_state = NETREG_REGISTERED;
5456 netdev_update_features(dev);
5459 * Default initial state at registry is that the
5460 * device is present.
5463 set_bit(__LINK_STATE_PRESENT, &dev->state);
5465 dev_init_scheduler(dev);
5467 list_netdevice(dev);
5469 /* Notify protocols, that a new device appeared. */
5470 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
5471 ret = notifier_to_errno(ret);
5473 rollback_registered(dev);
5474 dev->reg_state = NETREG_UNREGISTERED;
5477 * Prevent userspace races by waiting until the network
5478 * device is fully setup before sending notifications.
5480 if (!dev->rtnl_link_ops ||
5481 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
5482 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
5488 if (dev->netdev_ops->ndo_uninit)
5489 dev->netdev_ops->ndo_uninit(dev);
5492 EXPORT_SYMBOL(register_netdevice);
5495 * init_dummy_netdev - init a dummy network device for NAPI
5496 * @dev: device to init
5498 * This takes a network device structure and initialize the minimum
5499 * amount of fields so it can be used to schedule NAPI polls without
5500 * registering a full blown interface. This is to be used by drivers
5501 * that need to tie several hardware interfaces to a single NAPI
5502 * poll scheduler due to HW limitations.
5504 int init_dummy_netdev(struct net_device *dev)
5506 /* Clear everything. Note we don't initialize spinlocks
5507 * are they aren't supposed to be taken by any of the
5508 * NAPI code and this dummy netdev is supposed to be
5509 * only ever used for NAPI polls
5511 memset(dev, 0, sizeof(struct net_device));
5513 /* make sure we BUG if trying to hit standard
5514 * register/unregister code path
5516 dev->reg_state = NETREG_DUMMY;
5518 /* NAPI wants this */
5519 INIT_LIST_HEAD(&dev->napi_list);
5521 /* a dummy interface is started by default */
5522 set_bit(__LINK_STATE_PRESENT, &dev->state);
5523 set_bit(__LINK_STATE_START, &dev->state);
5525 /* Note : We dont allocate pcpu_refcnt for dummy devices,
5526 * because users of this 'device' dont need to change
5532 EXPORT_SYMBOL_GPL(init_dummy_netdev);
5536 * register_netdev - register a network device
5537 * @dev: device to register
5539 * Take a completed network device structure and add it to the kernel
5540 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5541 * chain. 0 is returned on success. A negative errno code is returned
5542 * on a failure to set up the device, or if the name is a duplicate.
5544 * This is a wrapper around register_netdevice that takes the rtnl semaphore
5545 * and expands the device name if you passed a format string to
5548 int register_netdev(struct net_device *dev)
5555 * If the name is a format string the caller wants us to do a
5558 if (strchr(dev->name, '%')) {
5559 err = dev_alloc_name(dev, dev->name);
5564 err = register_netdevice(dev);
5569 EXPORT_SYMBOL(register_netdev);
5571 int netdev_refcnt_read(const struct net_device *dev)
5575 for_each_possible_cpu(i)
5576 refcnt += *per_cpu_ptr(dev->pcpu_refcnt, i);
5579 EXPORT_SYMBOL(netdev_refcnt_read);
5582 * netdev_wait_allrefs - wait until all references are gone.
5584 * This is called when unregistering network devices.
5586 * Any protocol or device that holds a reference should register
5587 * for netdevice notification, and cleanup and put back the
5588 * reference if they receive an UNREGISTER event.
5589 * We can get stuck here if buggy protocols don't correctly
5592 static void netdev_wait_allrefs(struct net_device *dev)
5594 unsigned long rebroadcast_time, warning_time;
5597 linkwatch_forget_dev(dev);
5599 rebroadcast_time = warning_time = jiffies;
5600 refcnt = netdev_refcnt_read(dev);
5602 while (refcnt != 0) {
5603 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
5606 /* Rebroadcast unregister notification */
5607 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5608 /* don't resend NETDEV_UNREGISTER_BATCH, _BATCH users
5609 * should have already handle it the first time */
5611 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
5613 /* We must not have linkwatch events
5614 * pending on unregister. If this
5615 * happens, we simply run the queue
5616 * unscheduled, resulting in a noop
5619 linkwatch_run_queue();
5624 rebroadcast_time = jiffies;
5629 refcnt = netdev_refcnt_read(dev);
5631 if (time_after(jiffies, warning_time + 10 * HZ)) {
5632 printk(KERN_EMERG "unregister_netdevice: "
5633 "waiting for %s to become free. Usage "
5636 warning_time = jiffies;
5645 * register_netdevice(x1);
5646 * register_netdevice(x2);
5648 * unregister_netdevice(y1);
5649 * unregister_netdevice(y2);
5655 * We are invoked by rtnl_unlock().
5656 * This allows us to deal with problems:
5657 * 1) We can delete sysfs objects which invoke hotplug
5658 * without deadlocking with linkwatch via keventd.
5659 * 2) Since we run with the RTNL semaphore not held, we can sleep
5660 * safely in order to wait for the netdev refcnt to drop to zero.
5662 * We must not return until all unregister events added during
5663 * the interval the lock was held have been completed.
5665 void netdev_run_todo(void)
5667 struct list_head list;
5669 /* Snapshot list, allow later requests */
5670 list_replace_init(&net_todo_list, &list);
5674 while (!list_empty(&list)) {
5675 struct net_device *dev
5676 = list_first_entry(&list, struct net_device, todo_list);
5677 list_del(&dev->todo_list);
5679 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
5680 printk(KERN_ERR "network todo '%s' but state %d\n",
5681 dev->name, dev->reg_state);
5686 dev->reg_state = NETREG_UNREGISTERED;
5688 on_each_cpu(flush_backlog, dev, 1);
5690 netdev_wait_allrefs(dev);
5693 BUG_ON(netdev_refcnt_read(dev));
5694 WARN_ON(rcu_dereference_raw(dev->ip_ptr));
5695 WARN_ON(rcu_dereference_raw(dev->ip6_ptr));
5696 WARN_ON(dev->dn_ptr);
5698 if (dev->destructor)
5699 dev->destructor(dev);
5701 /* Free network device */
5702 kobject_put(&dev->dev.kobj);
5706 /* Convert net_device_stats to rtnl_link_stats64. They have the same
5707 * fields in the same order, with only the type differing.
5709 static void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
5710 const struct net_device_stats *netdev_stats)
5712 #if BITS_PER_LONG == 64
5713 BUILD_BUG_ON(sizeof(*stats64) != sizeof(*netdev_stats));
5714 memcpy(stats64, netdev_stats, sizeof(*stats64));
5716 size_t i, n = sizeof(*stats64) / sizeof(u64);
5717 const unsigned long *src = (const unsigned long *)netdev_stats;
5718 u64 *dst = (u64 *)stats64;
5720 BUILD_BUG_ON(sizeof(*netdev_stats) / sizeof(unsigned long) !=
5721 sizeof(*stats64) / sizeof(u64));
5722 for (i = 0; i < n; i++)
5728 * dev_get_stats - get network device statistics
5729 * @dev: device to get statistics from
5730 * @storage: place to store stats
5732 * Get network statistics from device. Return @storage.
5733 * The device driver may provide its own method by setting
5734 * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
5735 * otherwise the internal statistics structure is used.
5737 struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
5738 struct rtnl_link_stats64 *storage)
5740 const struct net_device_ops *ops = dev->netdev_ops;
5742 if (ops->ndo_get_stats64) {
5743 memset(storage, 0, sizeof(*storage));
5744 ops->ndo_get_stats64(dev, storage);
5745 } else if (ops->ndo_get_stats) {
5746 netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev));
5748 netdev_stats_to_stats64(storage, &dev->stats);
5750 storage->rx_dropped += atomic_long_read(&dev->rx_dropped);
5753 EXPORT_SYMBOL(dev_get_stats);
5755 struct netdev_queue *dev_ingress_queue_create(struct net_device *dev)
5757 struct netdev_queue *queue = dev_ingress_queue(dev);
5759 #ifdef CONFIG_NET_CLS_ACT
5762 queue = kzalloc(sizeof(*queue), GFP_KERNEL);
5765 netdev_init_one_queue(dev, queue, NULL);
5766 queue->qdisc = &noop_qdisc;
5767 queue->qdisc_sleeping = &noop_qdisc;
5768 rcu_assign_pointer(dev->ingress_queue, queue);
5774 * alloc_netdev_mqs - allocate network device
5775 * @sizeof_priv: size of private data to allocate space for
5776 * @name: device name format string
5777 * @setup: callback to initialize device
5778 * @txqs: the number of TX subqueues to allocate
5779 * @rxqs: the number of RX subqueues to allocate
5781 * Allocates a struct net_device with private data area for driver use
5782 * and performs basic initialization. Also allocates subquue structs
5783 * for each queue on the device.
5785 struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
5786 void (*setup)(struct net_device *),
5787 unsigned int txqs, unsigned int rxqs)
5789 struct net_device *dev;
5791 struct net_device *p;
5793 BUG_ON(strlen(name) >= sizeof(dev->name));
5796 pr_err("alloc_netdev: Unable to allocate device "
5797 "with zero queues.\n");
5803 pr_err("alloc_netdev: Unable to allocate device "
5804 "with zero RX queues.\n");
5809 alloc_size = sizeof(struct net_device);
5811 /* ensure 32-byte alignment of private area */
5812 alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
5813 alloc_size += sizeof_priv;
5815 /* ensure 32-byte alignment of whole construct */
5816 alloc_size += NETDEV_ALIGN - 1;
5818 p = kzalloc(alloc_size, GFP_KERNEL);
5820 printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
5824 dev = PTR_ALIGN(p, NETDEV_ALIGN);
5825 dev->padded = (char *)dev - (char *)p;
5827 dev->pcpu_refcnt = alloc_percpu(int);
5828 if (!dev->pcpu_refcnt)
5831 if (dev_addr_init(dev))
5837 dev_net_set(dev, &init_net);
5839 dev->gso_max_size = GSO_MAX_SIZE;
5841 INIT_LIST_HEAD(&dev->ethtool_ntuple_list.list);
5842 dev->ethtool_ntuple_list.count = 0;
5843 INIT_LIST_HEAD(&dev->napi_list);
5844 INIT_LIST_HEAD(&dev->unreg_list);
5845 INIT_LIST_HEAD(&dev->link_watch_list);
5846 dev->priv_flags = IFF_XMIT_DST_RELEASE;
5849 dev->num_tx_queues = txqs;
5850 dev->real_num_tx_queues = txqs;
5851 if (netif_alloc_netdev_queues(dev))
5855 dev->num_rx_queues = rxqs;
5856 dev->real_num_rx_queues = rxqs;
5857 if (netif_alloc_rx_queues(dev))
5861 strcpy(dev->name, name);
5862 dev->group = INIT_NETDEV_GROUP;
5870 free_percpu(dev->pcpu_refcnt);
5880 EXPORT_SYMBOL(alloc_netdev_mqs);
5883 * free_netdev - free network device
5886 * This function does the last stage of destroying an allocated device
5887 * interface. The reference to the device object is released.
5888 * If this is the last reference then it will be freed.
5890 void free_netdev(struct net_device *dev)
5892 struct napi_struct *p, *n;
5894 release_net(dev_net(dev));
5901 kfree(rcu_dereference_raw(dev->ingress_queue));
5903 /* Flush device addresses */
5904 dev_addr_flush(dev);
5906 /* Clear ethtool n-tuple list */
5907 ethtool_ntuple_flush(dev);
5909 list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
5912 free_percpu(dev->pcpu_refcnt);
5913 dev->pcpu_refcnt = NULL;
5915 /* Compatibility with error handling in drivers */
5916 if (dev->reg_state == NETREG_UNINITIALIZED) {
5917 kfree((char *)dev - dev->padded);
5921 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
5922 dev->reg_state = NETREG_RELEASED;
5924 /* will free via device release */
5925 put_device(&dev->dev);
5927 EXPORT_SYMBOL(free_netdev);
5930 * synchronize_net - Synchronize with packet receive processing
5932 * Wait for packets currently being received to be done.
5933 * Does not block later packets from starting.
5935 void synchronize_net(void)
5940 EXPORT_SYMBOL(synchronize_net);
5943 * unregister_netdevice_queue - remove device from the kernel
5947 * This function shuts down a device interface and removes it
5948 * from the kernel tables.
5949 * If head not NULL, device is queued to be unregistered later.
5951 * Callers must hold the rtnl semaphore. You may want
5952 * unregister_netdev() instead of this.
5955 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
5960 list_move_tail(&dev->unreg_list, head);
5962 rollback_registered(dev);
5963 /* Finish processing unregister after unlock */
5967 EXPORT_SYMBOL(unregister_netdevice_queue);
5970 * unregister_netdevice_many - unregister many devices
5971 * @head: list of devices
5973 void unregister_netdevice_many(struct list_head *head)
5975 struct net_device *dev;
5977 if (!list_empty(head)) {
5978 rollback_registered_many(head);
5979 list_for_each_entry(dev, head, unreg_list)
5983 EXPORT_SYMBOL(unregister_netdevice_many);
5986 * unregister_netdev - remove device from the kernel
5989 * This function shuts down a device interface and removes it
5990 * from the kernel tables.
5992 * This is just a wrapper for unregister_netdevice that takes
5993 * the rtnl semaphore. In general you want to use this and not
5994 * unregister_netdevice.
5996 void unregister_netdev(struct net_device *dev)
5999 unregister_netdevice(dev);
6002 EXPORT_SYMBOL(unregister_netdev);
6005 * dev_change_net_namespace - move device to different nethost namespace
6007 * @net: network namespace
6008 * @pat: If not NULL name pattern to try if the current device name
6009 * is already taken in the destination network namespace.
6011 * This function shuts down a device interface and moves it
6012 * to a new network namespace. On success 0 is returned, on
6013 * a failure a netagive errno code is returned.
6015 * Callers must hold the rtnl semaphore.
6018 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
6024 /* Don't allow namespace local devices to be moved. */
6026 if (dev->features & NETIF_F_NETNS_LOCAL)
6029 /* Ensure the device has been registrered */
6031 if (dev->reg_state != NETREG_REGISTERED)
6034 /* Get out if there is nothing todo */
6036 if (net_eq(dev_net(dev), net))
6039 /* Pick the destination device name, and ensure
6040 * we can use it in the destination network namespace.
6043 if (__dev_get_by_name(net, dev->name)) {
6044 /* We get here if we can't use the current device name */
6047 if (dev_get_valid_name(dev, pat, 1))
6052 * And now a mini version of register_netdevice unregister_netdevice.
6055 /* If device is running close it first. */
6058 /* And unlink it from device chain */
6060 unlist_netdevice(dev);
6064 /* Shutdown queueing discipline. */
6067 /* Notify protocols, that we are about to destroy
6068 this device. They should clean all the things.
6070 Note that dev->reg_state stays at NETREG_REGISTERED.
6071 This is wanted because this way 8021q and macvlan know
6072 the device is just moving and can keep their slaves up.
6074 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
6075 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
6078 * Flush the unicast and multicast chains
6083 /* Actually switch the network namespace */
6084 dev_net_set(dev, net);
6086 /* If there is an ifindex conflict assign a new one */
6087 if (__dev_get_by_index(net, dev->ifindex)) {
6088 int iflink = (dev->iflink == dev->ifindex);
6089 dev->ifindex = dev_new_index(net);
6091 dev->iflink = dev->ifindex;
6094 /* Fixup kobjects */
6095 err = device_rename(&dev->dev, dev->name);
6098 /* Add the device back in the hashes */
6099 list_netdevice(dev);
6101 /* Notify protocols, that a new device appeared. */
6102 call_netdevice_notifiers(NETDEV_REGISTER, dev);
6105 * Prevent userspace races by waiting until the network
6106 * device is fully setup before sending notifications.
6108 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
6115 EXPORT_SYMBOL_GPL(dev_change_net_namespace);
6117 static int dev_cpu_callback(struct notifier_block *nfb,
6118 unsigned long action,
6121 struct sk_buff **list_skb;
6122 struct sk_buff *skb;
6123 unsigned int cpu, oldcpu = (unsigned long)ocpu;
6124 struct softnet_data *sd, *oldsd;
6126 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
6129 local_irq_disable();
6130 cpu = smp_processor_id();
6131 sd = &per_cpu(softnet_data, cpu);
6132 oldsd = &per_cpu(softnet_data, oldcpu);
6134 /* Find end of our completion_queue. */
6135 list_skb = &sd->completion_queue;
6137 list_skb = &(*list_skb)->next;
6138 /* Append completion queue from offline CPU. */
6139 *list_skb = oldsd->completion_queue;
6140 oldsd->completion_queue = NULL;
6142 /* Append output queue from offline CPU. */
6143 if (oldsd->output_queue) {
6144 *sd->output_queue_tailp = oldsd->output_queue;
6145 sd->output_queue_tailp = oldsd->output_queue_tailp;
6146 oldsd->output_queue = NULL;
6147 oldsd->output_queue_tailp = &oldsd->output_queue;
6150 raise_softirq_irqoff(NET_TX_SOFTIRQ);
6153 /* Process offline CPU's input_pkt_queue */
6154 while ((skb = __skb_dequeue(&oldsd->process_queue))) {
6156 input_queue_head_incr(oldsd);
6158 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) {
6160 input_queue_head_incr(oldsd);
6168 * netdev_increment_features - increment feature set by one
6169 * @all: current feature set
6170 * @one: new feature set
6171 * @mask: mask feature set
6173 * Computes a new feature set after adding a device with feature set
6174 * @one to the master device with current feature set @all. Will not
6175 * enable anything that is off in @mask. Returns the new feature set.
6177 u32 netdev_increment_features(u32 all, u32 one, u32 mask)
6179 /* If device needs checksumming, downgrade to it. */
6180 if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM))
6181 all ^= NETIF_F_NO_CSUM | (one & NETIF_F_ALL_CSUM);
6182 else if (mask & NETIF_F_ALL_CSUM) {
6183 /* If one device supports v4/v6 checksumming, set for all. */
6184 if (one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM) &&
6185 !(all & NETIF_F_GEN_CSUM)) {
6186 all &= ~NETIF_F_ALL_CSUM;
6187 all |= one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
6190 /* If one device supports hw checksumming, set for all. */
6191 if (one & NETIF_F_GEN_CSUM && !(all & NETIF_F_GEN_CSUM)) {
6192 all &= ~NETIF_F_ALL_CSUM;
6193 all |= NETIF_F_HW_CSUM;
6197 one |= NETIF_F_ALL_CSUM;
6199 one |= all & NETIF_F_ONE_FOR_ALL;
6200 all &= one | NETIF_F_LLTX | NETIF_F_GSO | NETIF_F_UFO;
6201 all |= one & mask & NETIF_F_ONE_FOR_ALL;
6205 EXPORT_SYMBOL(netdev_increment_features);
6207 static struct hlist_head *netdev_create_hash(void)
6210 struct hlist_head *hash;
6212 hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
6214 for (i = 0; i < NETDEV_HASHENTRIES; i++)
6215 INIT_HLIST_HEAD(&hash[i]);
6220 /* Initialize per network namespace state */
6221 static int __net_init netdev_init(struct net *net)
6223 INIT_LIST_HEAD(&net->dev_base_head);
6225 net->dev_name_head = netdev_create_hash();
6226 if (net->dev_name_head == NULL)
6229 net->dev_index_head = netdev_create_hash();
6230 if (net->dev_index_head == NULL)
6236 kfree(net->dev_name_head);
6242 * netdev_drivername - network driver for the device
6243 * @dev: network device
6244 * @buffer: buffer for resulting name
6245 * @len: size of buffer
6247 * Determine network driver for device.
6249 char *netdev_drivername(const struct net_device *dev, char *buffer, int len)
6251 const struct device_driver *driver;
6252 const struct device *parent;
6254 if (len <= 0 || !buffer)
6258 parent = dev->dev.parent;
6263 driver = parent->driver;
6264 if (driver && driver->name)
6265 strlcpy(buffer, driver->name, len);
6269 static int __netdev_printk(const char *level, const struct net_device *dev,
6270 struct va_format *vaf)
6274 if (dev && dev->dev.parent)
6275 r = dev_printk(level, dev->dev.parent, "%s: %pV",
6276 netdev_name(dev), vaf);
6278 r = printk("%s%s: %pV", level, netdev_name(dev), vaf);
6280 r = printk("%s(NULL net_device): %pV", level, vaf);
6285 int netdev_printk(const char *level, const struct net_device *dev,
6286 const char *format, ...)
6288 struct va_format vaf;
6292 va_start(args, format);
6297 r = __netdev_printk(level, dev, &vaf);
6302 EXPORT_SYMBOL(netdev_printk);
6304 #define define_netdev_printk_level(func, level) \
6305 int func(const struct net_device *dev, const char *fmt, ...) \
6308 struct va_format vaf; \
6311 va_start(args, fmt); \
6316 r = __netdev_printk(level, dev, &vaf); \
6321 EXPORT_SYMBOL(func);
6323 define_netdev_printk_level(netdev_emerg, KERN_EMERG);
6324 define_netdev_printk_level(netdev_alert, KERN_ALERT);
6325 define_netdev_printk_level(netdev_crit, KERN_CRIT);
6326 define_netdev_printk_level(netdev_err, KERN_ERR);
6327 define_netdev_printk_level(netdev_warn, KERN_WARNING);
6328 define_netdev_printk_level(netdev_notice, KERN_NOTICE);
6329 define_netdev_printk_level(netdev_info, KERN_INFO);
6331 static void __net_exit netdev_exit(struct net *net)
6333 kfree(net->dev_name_head);
6334 kfree(net->dev_index_head);
6337 static struct pernet_operations __net_initdata netdev_net_ops = {
6338 .init = netdev_init,
6339 .exit = netdev_exit,
6342 static void __net_exit default_device_exit(struct net *net)
6344 struct net_device *dev, *aux;
6346 * Push all migratable network devices back to the
6347 * initial network namespace
6350 for_each_netdev_safe(net, dev, aux) {
6352 char fb_name[IFNAMSIZ];
6354 /* Ignore unmoveable devices (i.e. loopback) */
6355 if (dev->features & NETIF_F_NETNS_LOCAL)
6358 /* Leave virtual devices for the generic cleanup */
6359 if (dev->rtnl_link_ops)
6362 /* Push remaing network devices to init_net */
6363 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
6364 err = dev_change_net_namespace(dev, &init_net, fb_name);
6366 printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
6367 __func__, dev->name, err);
6374 static void __net_exit default_device_exit_batch(struct list_head *net_list)
6376 /* At exit all network devices most be removed from a network
6377 * namespace. Do this in the reverse order of registration.
6378 * Do this across as many network namespaces as possible to
6379 * improve batching efficiency.
6381 struct net_device *dev;
6383 LIST_HEAD(dev_kill_list);
6386 list_for_each_entry(net, net_list, exit_list) {
6387 for_each_netdev_reverse(net, dev) {
6388 if (dev->rtnl_link_ops)
6389 dev->rtnl_link_ops->dellink(dev, &dev_kill_list);
6391 unregister_netdevice_queue(dev, &dev_kill_list);
6394 unregister_netdevice_many(&dev_kill_list);
6395 list_del(&dev_kill_list);
6399 static struct pernet_operations __net_initdata default_device_ops = {
6400 .exit = default_device_exit,
6401 .exit_batch = default_device_exit_batch,
6405 * Initialize the DEV module. At boot time this walks the device list and
6406 * unhooks any devices that fail to initialise (normally hardware not
6407 * present) and leaves us with a valid list of present and active devices.
6412 * This is called single threaded during boot, so no need
6413 * to take the rtnl semaphore.
6415 static int __init net_dev_init(void)
6417 int i, rc = -ENOMEM;
6419 BUG_ON(!dev_boot_phase);
6421 if (dev_proc_init())
6424 if (netdev_kobject_init())
6427 INIT_LIST_HEAD(&ptype_all);
6428 for (i = 0; i < PTYPE_HASH_SIZE; i++)
6429 INIT_LIST_HEAD(&ptype_base[i]);
6431 if (register_pernet_subsys(&netdev_net_ops))
6435 * Initialise the packet receive queues.
6438 for_each_possible_cpu(i) {
6439 struct softnet_data *sd = &per_cpu(softnet_data, i);
6441 memset(sd, 0, sizeof(*sd));
6442 skb_queue_head_init(&sd->input_pkt_queue);
6443 skb_queue_head_init(&sd->process_queue);
6444 sd->completion_queue = NULL;
6445 INIT_LIST_HEAD(&sd->poll_list);
6446 sd->output_queue = NULL;
6447 sd->output_queue_tailp = &sd->output_queue;
6449 sd->csd.func = rps_trigger_softirq;
6455 sd->backlog.poll = process_backlog;
6456 sd->backlog.weight = weight_p;
6457 sd->backlog.gro_list = NULL;
6458 sd->backlog.gro_count = 0;
6463 /* The loopback device is special if any other network devices
6464 * is present in a network namespace the loopback device must
6465 * be present. Since we now dynamically allocate and free the
6466 * loopback device ensure this invariant is maintained by
6467 * keeping the loopback device as the first device on the
6468 * list of network devices. Ensuring the loopback devices
6469 * is the first device that appears and the last network device
6472 if (register_pernet_device(&loopback_net_ops))
6475 if (register_pernet_device(&default_device_ops))
6478 open_softirq(NET_TX_SOFTIRQ, net_tx_action);
6479 open_softirq(NET_RX_SOFTIRQ, net_rx_action);
6481 hotcpu_notifier(dev_cpu_callback, 0);
6489 subsys_initcall(net_dev_init);
6491 static int __init initialize_hashrnd(void)
6493 get_random_bytes(&hashrnd, sizeof(hashrnd));
6497 late_initcall_sync(initialize_hashrnd);