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/sched.h>
83 #include <linux/mutex.h>
84 #include <linux/string.h>
86 #include <linux/socket.h>
87 #include <linux/sockios.h>
88 #include <linux/errno.h>
89 #include <linux/interrupt.h>
90 #include <linux/if_ether.h>
91 #include <linux/netdevice.h>
92 #include <linux/etherdevice.h>
93 #include <linux/ethtool.h>
94 #include <linux/notifier.h>
95 #include <linux/skbuff.h>
96 #include <net/net_namespace.h>
98 #include <linux/rtnetlink.h>
99 #include <linux/proc_fs.h>
100 #include <linux/seq_file.h>
101 #include <linux/stat.h>
102 #include <linux/if_bridge.h>
103 #include <linux/if_macvlan.h>
105 #include <net/pkt_sched.h>
106 #include <net/checksum.h>
107 #include <linux/highmem.h>
108 #include <linux/init.h>
109 #include <linux/kmod.h>
110 #include <linux/module.h>
111 #include <linux/kallsyms.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>
125 #include "net-sysfs.h"
128 * The list of packet types we will receive (as opposed to discard)
129 * and the routines to invoke.
131 * Why 16. Because with 16 the only overlap we get on a hash of the
132 * low nibble of the protocol value is RARP/SNAP/X.25.
134 * NOTE: That is no longer true with the addition of VLAN tags. Not
135 * sure which should go first, but I bet it won't make much
136 * difference if we are running VLANs. The good news is that
137 * this protocol won't be in the list unless compiled in, so
138 * the average user (w/out VLANs) will not be adversely affected.
155 #define PTYPE_HASH_SIZE (16)
156 #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1)
158 static DEFINE_SPINLOCK(ptype_lock);
159 static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
160 static struct list_head ptype_all __read_mostly; /* Taps */
162 #ifdef CONFIG_NET_DMA
164 struct dma_client client;
166 cpumask_t channel_mask;
167 struct dma_chan **channels;
170 static enum dma_state_client
171 netdev_dma_event(struct dma_client *client, struct dma_chan *chan,
172 enum dma_state state);
174 static struct net_dma net_dma = {
176 .event_callback = netdev_dma_event,
182 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
185 * Pure readers hold dev_base_lock for reading.
187 * Writers must hold the rtnl semaphore while they loop through the
188 * dev_base_head list, and hold dev_base_lock for writing when they do the
189 * actual updates. This allows pure readers to access the list even
190 * while a writer is preparing to update it.
192 * To put it another way, dev_base_lock is held for writing only to
193 * protect against pure readers; the rtnl semaphore provides the
194 * protection against other writers.
196 * See, for example usages, register_netdevice() and
197 * unregister_netdevice(), which must be called with the rtnl
200 DEFINE_RWLOCK(dev_base_lock);
202 EXPORT_SYMBOL(dev_base_lock);
204 #define NETDEV_HASHBITS 8
205 #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
207 static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
209 unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
210 return &net->dev_name_head[hash & ((1 << NETDEV_HASHBITS) - 1)];
213 static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
215 return &net->dev_index_head[ifindex & ((1 << NETDEV_HASHBITS) - 1)];
218 /* Device list insertion */
219 static int list_netdevice(struct net_device *dev)
221 struct net *net = dev_net(dev);
225 write_lock_bh(&dev_base_lock);
226 list_add_tail(&dev->dev_list, &net->dev_base_head);
227 hlist_add_head(&dev->name_hlist, dev_name_hash(net, dev->name));
228 hlist_add_head(&dev->index_hlist, dev_index_hash(net, dev->ifindex));
229 write_unlock_bh(&dev_base_lock);
233 /* Device list removal */
234 static void unlist_netdevice(struct net_device *dev)
238 /* Unlink dev from the device chain */
239 write_lock_bh(&dev_base_lock);
240 list_del(&dev->dev_list);
241 hlist_del(&dev->name_hlist);
242 hlist_del(&dev->index_hlist);
243 write_unlock_bh(&dev_base_lock);
250 static RAW_NOTIFIER_HEAD(netdev_chain);
253 * Device drivers call our routines to queue packets here. We empty the
254 * queue in the local softnet handler.
257 DEFINE_PER_CPU(struct softnet_data, softnet_data);
259 #ifdef CONFIG_DEBUG_LOCK_ALLOC
261 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
262 * according to dev->type
264 static const unsigned short netdev_lock_type[] =
265 {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
266 ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
267 ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
268 ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
269 ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
270 ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
271 ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
272 ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
273 ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
274 ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
275 ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
276 ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
277 ARPHRD_FCFABRIC, ARPHRD_IEEE802_TR, ARPHRD_IEEE80211,
278 ARPHRD_IEEE80211_PRISM, ARPHRD_IEEE80211_RADIOTAP, ARPHRD_VOID,
281 static const char *netdev_lock_name[] =
282 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
283 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
284 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
285 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
286 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
287 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
288 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
289 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
290 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
291 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
292 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
293 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
294 "_xmit_FCFABRIC", "_xmit_IEEE802_TR", "_xmit_IEEE80211",
295 "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_VOID",
298 static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
300 static inline unsigned short netdev_lock_pos(unsigned short dev_type)
304 for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++)
305 if (netdev_lock_type[i] == dev_type)
307 /* the last key is used by default */
308 return ARRAY_SIZE(netdev_lock_type) - 1;
311 static inline void netdev_set_lockdep_class(spinlock_t *lock,
312 unsigned short dev_type)
316 i = netdev_lock_pos(dev_type);
317 lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
318 netdev_lock_name[i]);
321 static inline void netdev_set_lockdep_class(spinlock_t *lock,
322 unsigned short dev_type)
327 /*******************************************************************************
329 Protocol management and registration routines
331 *******************************************************************************/
334 * Add a protocol ID to the list. Now that the input handler is
335 * smarter we can dispense with all the messy stuff that used to be
338 * BEWARE!!! Protocol handlers, mangling input packets,
339 * MUST BE last in hash buckets and checking protocol handlers
340 * MUST start from promiscuous ptype_all chain in net_bh.
341 * It is true now, do not change it.
342 * Explanation follows: if protocol handler, mangling packet, will
343 * be the first on list, it is not able to sense, that packet
344 * is cloned and should be copied-on-write, so that it will
345 * change it and subsequent readers will get broken packet.
350 * dev_add_pack - add packet handler
351 * @pt: packet type declaration
353 * Add a protocol handler to the networking stack. The passed &packet_type
354 * is linked into kernel lists and may not be freed until it has been
355 * removed from the kernel lists.
357 * This call does not sleep therefore it can not
358 * guarantee all CPU's that are in middle of receiving packets
359 * will see the new packet type (until the next received packet).
362 void dev_add_pack(struct packet_type *pt)
366 spin_lock_bh(&ptype_lock);
367 if (pt->type == htons(ETH_P_ALL))
368 list_add_rcu(&pt->list, &ptype_all);
370 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
371 list_add_rcu(&pt->list, &ptype_base[hash]);
373 spin_unlock_bh(&ptype_lock);
377 * __dev_remove_pack - remove packet handler
378 * @pt: packet type declaration
380 * Remove a protocol handler that was previously added to the kernel
381 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
382 * from the kernel lists and can be freed or reused once this function
385 * The packet type might still be in use by receivers
386 * and must not be freed until after all the CPU's have gone
387 * through a quiescent state.
389 void __dev_remove_pack(struct packet_type *pt)
391 struct list_head *head;
392 struct packet_type *pt1;
394 spin_lock_bh(&ptype_lock);
396 if (pt->type == htons(ETH_P_ALL))
399 head = &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
401 list_for_each_entry(pt1, head, list) {
403 list_del_rcu(&pt->list);
408 printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt);
410 spin_unlock_bh(&ptype_lock);
413 * dev_remove_pack - remove packet handler
414 * @pt: packet type declaration
416 * Remove a protocol handler that was previously added to the kernel
417 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
418 * from the kernel lists and can be freed or reused once this function
421 * This call sleeps to guarantee that no CPU is looking at the packet
424 void dev_remove_pack(struct packet_type *pt)
426 __dev_remove_pack(pt);
431 /******************************************************************************
433 Device Boot-time Settings Routines
435 *******************************************************************************/
437 /* Boot time configuration table */
438 static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
441 * netdev_boot_setup_add - add new setup entry
442 * @name: name of the device
443 * @map: configured settings for the device
445 * Adds new setup entry to the dev_boot_setup list. The function
446 * returns 0 on error and 1 on success. This is a generic routine to
449 static int netdev_boot_setup_add(char *name, struct ifmap *map)
451 struct netdev_boot_setup *s;
455 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
456 if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
457 memset(s[i].name, 0, sizeof(s[i].name));
458 strlcpy(s[i].name, name, IFNAMSIZ);
459 memcpy(&s[i].map, map, sizeof(s[i].map));
464 return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
468 * netdev_boot_setup_check - check boot time settings
469 * @dev: the netdevice
471 * Check boot time settings for the device.
472 * The found settings are set for the device to be used
473 * later in the device probing.
474 * Returns 0 if no settings found, 1 if they are.
476 int netdev_boot_setup_check(struct net_device *dev)
478 struct netdev_boot_setup *s = dev_boot_setup;
481 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
482 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
483 !strcmp(dev->name, s[i].name)) {
484 dev->irq = s[i].map.irq;
485 dev->base_addr = s[i].map.base_addr;
486 dev->mem_start = s[i].map.mem_start;
487 dev->mem_end = s[i].map.mem_end;
496 * netdev_boot_base - get address from boot time settings
497 * @prefix: prefix for network device
498 * @unit: id for network device
500 * Check boot time settings for the base address of device.
501 * The found settings are set for the device to be used
502 * later in the device probing.
503 * Returns 0 if no settings found.
505 unsigned long netdev_boot_base(const char *prefix, int unit)
507 const struct netdev_boot_setup *s = dev_boot_setup;
511 sprintf(name, "%s%d", prefix, unit);
514 * If device already registered then return base of 1
515 * to indicate not to probe for this interface
517 if (__dev_get_by_name(&init_net, name))
520 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
521 if (!strcmp(name, s[i].name))
522 return s[i].map.base_addr;
527 * Saves at boot time configured settings for any netdevice.
529 int __init netdev_boot_setup(char *str)
534 str = get_options(str, ARRAY_SIZE(ints), ints);
539 memset(&map, 0, sizeof(map));
543 map.base_addr = ints[2];
545 map.mem_start = ints[3];
547 map.mem_end = ints[4];
549 /* Add new entry to the list */
550 return netdev_boot_setup_add(str, &map);
553 __setup("netdev=", netdev_boot_setup);
555 /*******************************************************************************
557 Device Interface Subroutines
559 *******************************************************************************/
562 * __dev_get_by_name - find a device by its name
563 * @net: the applicable net namespace
564 * @name: name to find
566 * Find an interface by name. Must be called under RTNL semaphore
567 * or @dev_base_lock. If the name is found a pointer to the device
568 * is returned. If the name is not found then %NULL is returned. The
569 * reference counters are not incremented so the caller must be
570 * careful with locks.
573 struct net_device *__dev_get_by_name(struct net *net, const char *name)
575 struct hlist_node *p;
577 hlist_for_each(p, dev_name_hash(net, name)) {
578 struct net_device *dev
579 = hlist_entry(p, struct net_device, name_hlist);
580 if (!strncmp(dev->name, name, IFNAMSIZ))
587 * dev_get_by_name - find a device by its name
588 * @net: the applicable net namespace
589 * @name: name to find
591 * Find an interface by name. This can be called from any
592 * context and does its own locking. The returned handle has
593 * the usage count incremented and the caller must use dev_put() to
594 * release it when it is no longer needed. %NULL is returned if no
595 * matching device is found.
598 struct net_device *dev_get_by_name(struct net *net, const char *name)
600 struct net_device *dev;
602 read_lock(&dev_base_lock);
603 dev = __dev_get_by_name(net, name);
606 read_unlock(&dev_base_lock);
611 * __dev_get_by_index - find a device by its ifindex
612 * @net: the applicable net namespace
613 * @ifindex: index of device
615 * Search for an interface by index. Returns %NULL if the device
616 * is not found or a pointer to the device. The device has not
617 * had its reference counter increased so the caller must be careful
618 * about locking. The caller must hold either the RTNL semaphore
622 struct net_device *__dev_get_by_index(struct net *net, int ifindex)
624 struct hlist_node *p;
626 hlist_for_each(p, dev_index_hash(net, ifindex)) {
627 struct net_device *dev
628 = hlist_entry(p, struct net_device, index_hlist);
629 if (dev->ifindex == ifindex)
637 * dev_get_by_index - find a device by its ifindex
638 * @net: the applicable net namespace
639 * @ifindex: index of device
641 * Search for an interface by index. Returns NULL if the device
642 * is not found or a pointer to the device. The device returned has
643 * had a reference added and the pointer is safe until the user calls
644 * dev_put to indicate they have finished with it.
647 struct net_device *dev_get_by_index(struct net *net, int ifindex)
649 struct net_device *dev;
651 read_lock(&dev_base_lock);
652 dev = __dev_get_by_index(net, ifindex);
655 read_unlock(&dev_base_lock);
660 * dev_getbyhwaddr - find a device by its hardware address
661 * @net: the applicable net namespace
662 * @type: media type of device
663 * @ha: hardware address
665 * Search for an interface by MAC address. Returns NULL if the device
666 * is not found or a pointer to the device. The caller must hold the
667 * rtnl semaphore. The returned device has not had its ref count increased
668 * and the caller must therefore be careful about locking
671 * If the API was consistent this would be __dev_get_by_hwaddr
674 struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *ha)
676 struct net_device *dev;
680 for_each_netdev(net, dev)
681 if (dev->type == type &&
682 !memcmp(dev->dev_addr, ha, dev->addr_len))
688 EXPORT_SYMBOL(dev_getbyhwaddr);
690 struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
692 struct net_device *dev;
695 for_each_netdev(net, dev)
696 if (dev->type == type)
702 EXPORT_SYMBOL(__dev_getfirstbyhwtype);
704 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
706 struct net_device *dev;
709 dev = __dev_getfirstbyhwtype(net, type);
716 EXPORT_SYMBOL(dev_getfirstbyhwtype);
719 * dev_get_by_flags - find any device with given flags
720 * @net: the applicable net namespace
721 * @if_flags: IFF_* values
722 * @mask: bitmask of bits in if_flags to check
724 * Search for any interface with the given flags. Returns NULL if a device
725 * is not found or a pointer to the device. The device returned has
726 * had a reference added and the pointer is safe until the user calls
727 * dev_put to indicate they have finished with it.
730 struct net_device * dev_get_by_flags(struct net *net, unsigned short if_flags, unsigned short mask)
732 struct net_device *dev, *ret;
735 read_lock(&dev_base_lock);
736 for_each_netdev(net, dev) {
737 if (((dev->flags ^ if_flags) & mask) == 0) {
743 read_unlock(&dev_base_lock);
748 * dev_valid_name - check if name is okay for network device
751 * Network device names need to be valid file names to
752 * to allow sysfs to work. We also disallow any kind of
755 int dev_valid_name(const char *name)
759 if (strlen(name) >= IFNAMSIZ)
761 if (!strcmp(name, ".") || !strcmp(name, ".."))
765 if (*name == '/' || isspace(*name))
773 * __dev_alloc_name - allocate a name for a device
774 * @net: network namespace to allocate the device name in
775 * @name: name format string
776 * @buf: scratch buffer and result name string
778 * Passed a format string - eg "lt%d" it will try and find a suitable
779 * id. It scans list of devices to build up a free map, then chooses
780 * the first empty slot. The caller must hold the dev_base or rtnl lock
781 * while allocating the name and adding the device in order to avoid
783 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
784 * Returns the number of the unit assigned or a negative errno code.
787 static int __dev_alloc_name(struct net *net, const char *name, char *buf)
791 const int max_netdevices = 8*PAGE_SIZE;
792 unsigned long *inuse;
793 struct net_device *d;
795 p = strnchr(name, IFNAMSIZ-1, '%');
798 * Verify the string as this thing may have come from
799 * the user. There must be either one "%d" and no other "%"
802 if (p[1] != 'd' || strchr(p + 2, '%'))
805 /* Use one page as a bit array of possible slots */
806 inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
810 for_each_netdev(net, d) {
811 if (!sscanf(d->name, name, &i))
813 if (i < 0 || i >= max_netdevices)
816 /* avoid cases where sscanf is not exact inverse of printf */
817 snprintf(buf, IFNAMSIZ, name, i);
818 if (!strncmp(buf, d->name, IFNAMSIZ))
822 i = find_first_zero_bit(inuse, max_netdevices);
823 free_page((unsigned long) inuse);
826 snprintf(buf, IFNAMSIZ, name, i);
827 if (!__dev_get_by_name(net, buf))
830 /* It is possible to run out of possible slots
831 * when the name is long and there isn't enough space left
832 * for the digits, or if all bits are used.
838 * dev_alloc_name - allocate a name for a device
840 * @name: name format string
842 * Passed a format string - eg "lt%d" it will try and find a suitable
843 * id. It scans list of devices to build up a free map, then chooses
844 * the first empty slot. The caller must hold the dev_base or rtnl lock
845 * while allocating the name and adding the device in order to avoid
847 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
848 * Returns the number of the unit assigned or a negative errno code.
851 int dev_alloc_name(struct net_device *dev, const char *name)
857 BUG_ON(!dev_net(dev));
859 ret = __dev_alloc_name(net, name, buf);
861 strlcpy(dev->name, buf, IFNAMSIZ);
867 * dev_change_name - change name of a device
869 * @newname: name (or format string) must be at least IFNAMSIZ
871 * Change name of a device, can pass format strings "eth%d".
874 int dev_change_name(struct net_device *dev, char *newname)
876 char oldname[IFNAMSIZ];
882 BUG_ON(!dev_net(dev));
885 if (dev->flags & IFF_UP)
888 if (!dev_valid_name(newname))
891 if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
894 memcpy(oldname, dev->name, IFNAMSIZ);
896 if (strchr(newname, '%')) {
897 err = dev_alloc_name(dev, newname);
900 strcpy(newname, dev->name);
902 else if (__dev_get_by_name(net, newname))
905 strlcpy(dev->name, newname, IFNAMSIZ);
908 err = device_rename(&dev->dev, dev->name);
910 memcpy(dev->name, oldname, IFNAMSIZ);
914 write_lock_bh(&dev_base_lock);
915 hlist_del(&dev->name_hlist);
916 hlist_add_head(&dev->name_hlist, dev_name_hash(net, dev->name));
917 write_unlock_bh(&dev_base_lock);
919 ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
920 ret = notifier_to_errno(ret);
925 "%s: name change rollback failed: %d.\n",
929 memcpy(dev->name, oldname, IFNAMSIZ);
938 * netdev_features_change - device changes features
939 * @dev: device to cause notification
941 * Called to indicate a device has changed features.
943 void netdev_features_change(struct net_device *dev)
945 call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
947 EXPORT_SYMBOL(netdev_features_change);
950 * netdev_state_change - device changes state
951 * @dev: device to cause notification
953 * Called to indicate a device has changed state. This function calls
954 * the notifier chains for netdev_chain and sends a NEWLINK message
955 * to the routing socket.
957 void netdev_state_change(struct net_device *dev)
959 if (dev->flags & IFF_UP) {
960 call_netdevice_notifiers(NETDEV_CHANGE, dev);
961 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
965 void netdev_bonding_change(struct net_device *dev)
967 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, dev);
969 EXPORT_SYMBOL(netdev_bonding_change);
972 * dev_load - load a network module
973 * @net: the applicable net namespace
974 * @name: name of interface
976 * If a network interface is not present and the process has suitable
977 * privileges this function loads the module. If module loading is not
978 * available in this kernel then it becomes a nop.
981 void dev_load(struct net *net, const char *name)
983 struct net_device *dev;
985 read_lock(&dev_base_lock);
986 dev = __dev_get_by_name(net, name);
987 read_unlock(&dev_base_lock);
989 if (!dev && capable(CAP_SYS_MODULE))
990 request_module("%s", name);
994 * dev_open - prepare an interface for use.
995 * @dev: device to open
997 * Takes a device from down to up state. The device's private open
998 * function is invoked and then the multicast lists are loaded. Finally
999 * the device is moved into the up state and a %NETDEV_UP message is
1000 * sent to the netdev notifier chain.
1002 * Calling this function on an active interface is a nop. On a failure
1003 * a negative errno code is returned.
1005 int dev_open(struct net_device *dev)
1015 if (dev->flags & IFF_UP)
1019 * Is it even present?
1021 if (!netif_device_present(dev))
1025 * Call device private open method
1027 set_bit(__LINK_STATE_START, &dev->state);
1029 if (dev->validate_addr)
1030 ret = dev->validate_addr(dev);
1032 if (!ret && dev->open)
1033 ret = dev->open(dev);
1036 * If it went open OK then:
1040 clear_bit(__LINK_STATE_START, &dev->state);
1045 dev->flags |= IFF_UP;
1048 * Initialize multicasting status
1050 dev_set_rx_mode(dev);
1053 * Wakeup transmit queue engine
1058 * ... and announce new interface.
1060 call_netdevice_notifiers(NETDEV_UP, dev);
1067 * dev_close - shutdown an interface.
1068 * @dev: device to shutdown
1070 * This function moves an active device into down state. A
1071 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1072 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1075 int dev_close(struct net_device *dev)
1081 if (!(dev->flags & IFF_UP))
1085 * Tell people we are going down, so that they can
1086 * prepare to death, when device is still operating.
1088 call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
1090 clear_bit(__LINK_STATE_START, &dev->state);
1092 /* Synchronize to scheduled poll. We cannot touch poll list,
1093 * it can be even on different cpu. So just clear netif_running().
1095 * dev->stop() will invoke napi_disable() on all of it's
1096 * napi_struct instances on this device.
1098 smp_mb__after_clear_bit(); /* Commit netif_running(). */
1100 dev_deactivate(dev);
1103 * Call the device specific close. This cannot fail.
1104 * Only if device is UP
1106 * We allow it to be called even after a DETACH hot-plug
1113 * Device is now down.
1116 dev->flags &= ~IFF_UP;
1119 * Tell people we are down
1121 call_netdevice_notifiers(NETDEV_DOWN, dev);
1128 * dev_disable_lro - disable Large Receive Offload on a device
1131 * Disable Large Receive Offload (LRO) on a net device. Must be
1132 * called under RTNL. This is needed if received packets may be
1133 * forwarded to another interface.
1135 void dev_disable_lro(struct net_device *dev)
1137 if (dev->ethtool_ops && dev->ethtool_ops->get_flags &&
1138 dev->ethtool_ops->set_flags) {
1139 u32 flags = dev->ethtool_ops->get_flags(dev);
1140 if (flags & ETH_FLAG_LRO) {
1141 flags &= ~ETH_FLAG_LRO;
1142 dev->ethtool_ops->set_flags(dev, flags);
1145 WARN_ON(dev->features & NETIF_F_LRO);
1147 EXPORT_SYMBOL(dev_disable_lro);
1150 static int dev_boot_phase = 1;
1153 * Device change register/unregister. These are not inline or static
1154 * as we export them to the world.
1158 * register_netdevice_notifier - register a network notifier block
1161 * Register a notifier to be called when network device events occur.
1162 * The notifier passed is linked into the kernel structures and must
1163 * not be reused until it has been unregistered. A negative errno code
1164 * is returned on a failure.
1166 * When registered all registration and up events are replayed
1167 * to the new notifier to allow device to have a race free
1168 * view of the network device list.
1171 int register_netdevice_notifier(struct notifier_block *nb)
1173 struct net_device *dev;
1174 struct net_device *last;
1179 err = raw_notifier_chain_register(&netdev_chain, nb);
1185 for_each_netdev(net, dev) {
1186 err = nb->notifier_call(nb, NETDEV_REGISTER, dev);
1187 err = notifier_to_errno(err);
1191 if (!(dev->flags & IFF_UP))
1194 nb->notifier_call(nb, NETDEV_UP, dev);
1205 for_each_netdev(net, dev) {
1209 if (dev->flags & IFF_UP) {
1210 nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
1211 nb->notifier_call(nb, NETDEV_DOWN, dev);
1213 nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
1217 raw_notifier_chain_unregister(&netdev_chain, nb);
1222 * unregister_netdevice_notifier - unregister a network notifier block
1225 * Unregister a notifier previously registered by
1226 * register_netdevice_notifier(). The notifier is unlinked into the
1227 * kernel structures and may then be reused. A negative errno code
1228 * is returned on a failure.
1231 int unregister_netdevice_notifier(struct notifier_block *nb)
1236 err = raw_notifier_chain_unregister(&netdev_chain, nb);
1242 * call_netdevice_notifiers - call all network notifier blocks
1243 * @val: value passed unmodified to notifier function
1244 * @dev: net_device pointer passed unmodified to notifier function
1246 * Call all network notifier blocks. Parameters and return value
1247 * are as for raw_notifier_call_chain().
1250 int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
1252 return raw_notifier_call_chain(&netdev_chain, val, dev);
1255 /* When > 0 there are consumers of rx skb time stamps */
1256 static atomic_t netstamp_needed = ATOMIC_INIT(0);
1258 void net_enable_timestamp(void)
1260 atomic_inc(&netstamp_needed);
1263 void net_disable_timestamp(void)
1265 atomic_dec(&netstamp_needed);
1268 static inline void net_timestamp(struct sk_buff *skb)
1270 if (atomic_read(&netstamp_needed))
1271 __net_timestamp(skb);
1273 skb->tstamp.tv64 = 0;
1277 * Support routine. Sends outgoing frames to any network
1278 * taps currently in use.
1281 static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1283 struct packet_type *ptype;
1288 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1289 /* Never send packets back to the socket
1290 * they originated from - MvS (miquels@drinkel.ow.org)
1292 if ((ptype->dev == dev || !ptype->dev) &&
1293 (ptype->af_packet_priv == NULL ||
1294 (struct sock *)ptype->af_packet_priv != skb->sk)) {
1295 struct sk_buff *skb2= skb_clone(skb, GFP_ATOMIC);
1299 /* skb->nh should be correctly
1300 set by sender, so that the second statement is
1301 just protection against buggy protocols.
1303 skb_reset_mac_header(skb2);
1305 if (skb_network_header(skb2) < skb2->data ||
1306 skb2->network_header > skb2->tail) {
1307 if (net_ratelimit())
1308 printk(KERN_CRIT "protocol %04x is "
1310 skb2->protocol, dev->name);
1311 skb_reset_network_header(skb2);
1314 skb2->transport_header = skb2->network_header;
1315 skb2->pkt_type = PACKET_OUTGOING;
1316 ptype->func(skb2, skb->dev, ptype, skb->dev);
1323 void __netif_schedule(struct netdev_queue *txq)
1325 struct net_device *dev = txq->dev;
1327 if (!test_and_set_bit(__LINK_STATE_SCHED, &dev->state)) {
1328 struct softnet_data *sd;
1329 unsigned long flags;
1331 local_irq_save(flags);
1332 sd = &__get_cpu_var(softnet_data);
1333 txq->next_sched = sd->output_queue;
1334 sd->output_queue = txq;
1335 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1336 local_irq_restore(flags);
1339 EXPORT_SYMBOL(__netif_schedule);
1341 void dev_kfree_skb_irq(struct sk_buff *skb)
1343 if (atomic_dec_and_test(&skb->users)) {
1344 struct softnet_data *sd;
1345 unsigned long flags;
1347 local_irq_save(flags);
1348 sd = &__get_cpu_var(softnet_data);
1349 skb->next = sd->completion_queue;
1350 sd->completion_queue = skb;
1351 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1352 local_irq_restore(flags);
1355 EXPORT_SYMBOL(dev_kfree_skb_irq);
1357 void dev_kfree_skb_any(struct sk_buff *skb)
1359 if (in_irq() || irqs_disabled())
1360 dev_kfree_skb_irq(skb);
1364 EXPORT_SYMBOL(dev_kfree_skb_any);
1368 * netif_device_detach - mark device as removed
1369 * @dev: network device
1371 * Mark device as removed from system and therefore no longer available.
1373 void netif_device_detach(struct net_device *dev)
1375 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
1376 netif_running(dev)) {
1377 netif_stop_queue(dev);
1380 EXPORT_SYMBOL(netif_device_detach);
1383 * netif_device_attach - mark device as attached
1384 * @dev: network device
1386 * Mark device as attached from system and restart if needed.
1388 void netif_device_attach(struct net_device *dev)
1390 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
1391 netif_running(dev)) {
1392 netif_wake_queue(dev);
1393 __netdev_watchdog_up(dev);
1396 EXPORT_SYMBOL(netif_device_attach);
1398 static bool can_checksum_protocol(unsigned long features, __be16 protocol)
1400 return ((features & NETIF_F_GEN_CSUM) ||
1401 ((features & NETIF_F_IP_CSUM) &&
1402 protocol == htons(ETH_P_IP)) ||
1403 ((features & NETIF_F_IPV6_CSUM) &&
1404 protocol == htons(ETH_P_IPV6)));
1407 static bool dev_can_checksum(struct net_device *dev, struct sk_buff *skb)
1409 if (can_checksum_protocol(dev->features, skb->protocol))
1412 if (skb->protocol == htons(ETH_P_8021Q)) {
1413 struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
1414 if (can_checksum_protocol(dev->features & dev->vlan_features,
1415 veh->h_vlan_encapsulated_proto))
1423 * Invalidate hardware checksum when packet is to be mangled, and
1424 * complete checksum manually on outgoing path.
1426 int skb_checksum_help(struct sk_buff *skb)
1429 int ret = 0, offset;
1431 if (skb->ip_summed == CHECKSUM_COMPLETE)
1432 goto out_set_summed;
1434 if (unlikely(skb_shinfo(skb)->gso_size)) {
1435 /* Let GSO fix up the checksum. */
1436 goto out_set_summed;
1439 offset = skb->csum_start - skb_headroom(skb);
1440 BUG_ON(offset >= skb_headlen(skb));
1441 csum = skb_checksum(skb, offset, skb->len - offset, 0);
1443 offset += skb->csum_offset;
1444 BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
1446 if (skb_cloned(skb) &&
1447 !skb_clone_writable(skb, offset + sizeof(__sum16))) {
1448 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1453 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1455 skb->ip_summed = CHECKSUM_NONE;
1461 * skb_gso_segment - Perform segmentation on skb.
1462 * @skb: buffer to segment
1463 * @features: features for the output path (see dev->features)
1465 * This function segments the given skb and returns a list of segments.
1467 * It may return NULL if the skb requires no segmentation. This is
1468 * only possible when GSO is used for verifying header integrity.
1470 struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features)
1472 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
1473 struct packet_type *ptype;
1474 __be16 type = skb->protocol;
1477 BUG_ON(skb_shinfo(skb)->frag_list);
1479 skb_reset_mac_header(skb);
1480 skb->mac_len = skb->network_header - skb->mac_header;
1481 __skb_pull(skb, skb->mac_len);
1483 if (WARN_ON(skb->ip_summed != CHECKSUM_PARTIAL)) {
1484 if (skb_header_cloned(skb) &&
1485 (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
1486 return ERR_PTR(err);
1490 list_for_each_entry_rcu(ptype,
1491 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
1492 if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1493 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1494 err = ptype->gso_send_check(skb);
1495 segs = ERR_PTR(err);
1496 if (err || skb_gso_ok(skb, features))
1498 __skb_push(skb, (skb->data -
1499 skb_network_header(skb)));
1501 segs = ptype->gso_segment(skb, features);
1507 __skb_push(skb, skb->data - skb_mac_header(skb));
1512 EXPORT_SYMBOL(skb_gso_segment);
1514 /* Take action when hardware reception checksum errors are detected. */
1516 void netdev_rx_csum_fault(struct net_device *dev)
1518 if (net_ratelimit()) {
1519 printk(KERN_ERR "%s: hw csum failure.\n",
1520 dev ? dev->name : "<unknown>");
1524 EXPORT_SYMBOL(netdev_rx_csum_fault);
1527 /* Actually, we should eliminate this check as soon as we know, that:
1528 * 1. IOMMU is present and allows to map all the memory.
1529 * 2. No high memory really exists on this machine.
1532 static inline int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
1534 #ifdef CONFIG_HIGHMEM
1537 if (dev->features & NETIF_F_HIGHDMA)
1540 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
1541 if (PageHighMem(skb_shinfo(skb)->frags[i].page))
1549 void (*destructor)(struct sk_buff *skb);
1552 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
1554 static void dev_gso_skb_destructor(struct sk_buff *skb)
1556 struct dev_gso_cb *cb;
1559 struct sk_buff *nskb = skb->next;
1561 skb->next = nskb->next;
1564 } while (skb->next);
1566 cb = DEV_GSO_CB(skb);
1568 cb->destructor(skb);
1572 * dev_gso_segment - Perform emulated hardware segmentation on skb.
1573 * @skb: buffer to segment
1575 * This function segments the given skb and stores the list of segments
1578 static int dev_gso_segment(struct sk_buff *skb)
1580 struct net_device *dev = skb->dev;
1581 struct sk_buff *segs;
1582 int features = dev->features & ~(illegal_highdma(dev, skb) ?
1585 segs = skb_gso_segment(skb, features);
1587 /* Verifying header integrity only. */
1592 return PTR_ERR(segs);
1595 DEV_GSO_CB(skb)->destructor = skb->destructor;
1596 skb->destructor = dev_gso_skb_destructor;
1601 int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
1602 struct netdev_queue *txq)
1604 if (likely(!skb->next)) {
1605 if (!list_empty(&ptype_all))
1606 dev_queue_xmit_nit(skb, dev);
1608 if (netif_needs_gso(dev, skb)) {
1609 if (unlikely(dev_gso_segment(skb)))
1615 return dev->hard_start_xmit(skb, dev);
1620 struct sk_buff *nskb = skb->next;
1623 skb->next = nskb->next;
1625 rc = dev->hard_start_xmit(nskb, dev);
1627 nskb->next = skb->next;
1631 if (unlikely(netif_tx_queue_stopped(txq) && skb->next))
1632 return NETDEV_TX_BUSY;
1633 } while (skb->next);
1635 skb->destructor = DEV_GSO_CB(skb)->destructor;
1643 * dev_queue_xmit - transmit a buffer
1644 * @skb: buffer to transmit
1646 * Queue a buffer for transmission to a network device. The caller must
1647 * have set the device and priority and built the buffer before calling
1648 * this function. The function can be called from an interrupt.
1650 * A negative errno code is returned on a failure. A success does not
1651 * guarantee the frame will be transmitted as it may be dropped due
1652 * to congestion or traffic shaping.
1654 * -----------------------------------------------------------------------------------
1655 * I notice this method can also return errors from the queue disciplines,
1656 * including NET_XMIT_DROP, which is a positive value. So, errors can also
1659 * Regardless of the return value, the skb is consumed, so it is currently
1660 * difficult to retry a send to this method. (You can bump the ref count
1661 * before sending to hold a reference for retry if you are careful.)
1663 * When calling this method, interrupts MUST be enabled. This is because
1664 * the BH enable code must have IRQs enabled so that it will not deadlock.
1668 static struct netdev_queue *dev_pick_tx(struct net_device *dev,
1669 struct sk_buff *skb)
1671 u16 queue_index = 0;
1673 skb_set_queue_mapping(skb, queue_index);
1674 return netdev_get_tx_queue(dev, queue_index);
1677 int dev_queue_xmit(struct sk_buff *skb)
1679 struct net_device *dev = skb->dev;
1680 struct netdev_queue *txq;
1684 /* GSO will handle the following emulations directly. */
1685 if (netif_needs_gso(dev, skb))
1688 if (skb_shinfo(skb)->frag_list &&
1689 !(dev->features & NETIF_F_FRAGLIST) &&
1690 __skb_linearize(skb))
1693 /* Fragmented skb is linearized if device does not support SG,
1694 * or if at least one of fragments is in highmem and device
1695 * does not support DMA from it.
1697 if (skb_shinfo(skb)->nr_frags &&
1698 (!(dev->features & NETIF_F_SG) || illegal_highdma(dev, skb)) &&
1699 __skb_linearize(skb))
1702 /* If packet is not checksummed and device does not support
1703 * checksumming for this protocol, complete checksumming here.
1705 if (skb->ip_summed == CHECKSUM_PARTIAL) {
1706 skb_set_transport_header(skb, skb->csum_start -
1708 if (!dev_can_checksum(dev, skb) && skb_checksum_help(skb))
1713 txq = dev_pick_tx(dev, skb);
1714 spin_lock_prefetch(&txq->lock);
1716 /* Disable soft irqs for various locks below. Also
1717 * stops preemption for RCU.
1721 /* Updates of qdisc are serialized by queue->lock.
1722 * The struct Qdisc which is pointed to by qdisc is now a
1723 * rcu structure - it may be accessed without acquiring
1724 * a lock (but the structure may be stale.) The freeing of the
1725 * qdisc will be deferred until it's known that there are no
1726 * more references to it.
1728 * If the qdisc has an enqueue function, we still need to
1729 * hold the queue->lock before calling it, since queue->lock
1730 * also serializes access to the device queue.
1733 q = rcu_dereference(txq->qdisc);
1734 #ifdef CONFIG_NET_CLS_ACT
1735 skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_EGRESS);
1738 /* Grab device queue */
1739 spin_lock(&txq->lock);
1742 rc = q->enqueue(skb, q);
1744 spin_unlock(&txq->lock);
1746 rc = rc == NET_XMIT_BYPASS ? NET_XMIT_SUCCESS : rc;
1749 spin_unlock(&txq->lock);
1752 /* The device has no queue. Common case for software devices:
1753 loopback, all the sorts of tunnels...
1755 Really, it is unlikely that netif_tx_lock protection is necessary
1756 here. (f.e. loopback and IP tunnels are clean ignoring statistics
1758 However, it is possible, that they rely on protection
1761 Check this and shot the lock. It is not prone from deadlocks.
1762 Either shot noqueue qdisc, it is even simpler 8)
1764 if (dev->flags & IFF_UP) {
1765 int cpu = smp_processor_id(); /* ok because BHs are off */
1767 if (txq->xmit_lock_owner != cpu) {
1769 HARD_TX_LOCK(dev, txq, cpu);
1771 if (!netif_tx_queue_stopped(txq)) {
1773 if (!dev_hard_start_xmit(skb, dev, txq)) {
1774 HARD_TX_UNLOCK(dev, txq);
1778 HARD_TX_UNLOCK(dev, txq);
1779 if (net_ratelimit())
1780 printk(KERN_CRIT "Virtual device %s asks to "
1781 "queue packet!\n", dev->name);
1783 /* Recursion is detected! It is possible,
1785 if (net_ratelimit())
1786 printk(KERN_CRIT "Dead loop on virtual device "
1787 "%s, fix it urgently!\n", dev->name);
1792 rcu_read_unlock_bh();
1798 rcu_read_unlock_bh();
1803 /*=======================================================================
1805 =======================================================================*/
1807 int netdev_max_backlog __read_mostly = 1000;
1808 int netdev_budget __read_mostly = 300;
1809 int weight_p __read_mostly = 64; /* old backlog weight */
1811 DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, };
1815 * netif_rx - post buffer to the network code
1816 * @skb: buffer to post
1818 * This function receives a packet from a device driver and queues it for
1819 * the upper (protocol) levels to process. It always succeeds. The buffer
1820 * may be dropped during processing for congestion control or by the
1824 * NET_RX_SUCCESS (no congestion)
1825 * NET_RX_DROP (packet was dropped)
1829 int netif_rx(struct sk_buff *skb)
1831 struct softnet_data *queue;
1832 unsigned long flags;
1834 /* if netpoll wants it, pretend we never saw it */
1835 if (netpoll_rx(skb))
1838 if (!skb->tstamp.tv64)
1842 * The code is rearranged so that the path is the most
1843 * short when CPU is congested, but is still operating.
1845 local_irq_save(flags);
1846 queue = &__get_cpu_var(softnet_data);
1848 __get_cpu_var(netdev_rx_stat).total++;
1849 if (queue->input_pkt_queue.qlen <= netdev_max_backlog) {
1850 if (queue->input_pkt_queue.qlen) {
1853 __skb_queue_tail(&queue->input_pkt_queue, skb);
1854 local_irq_restore(flags);
1855 return NET_RX_SUCCESS;
1858 napi_schedule(&queue->backlog);
1862 __get_cpu_var(netdev_rx_stat).dropped++;
1863 local_irq_restore(flags);
1869 int netif_rx_ni(struct sk_buff *skb)
1874 err = netif_rx(skb);
1875 if (local_softirq_pending())
1882 EXPORT_SYMBOL(netif_rx_ni);
1884 static inline struct net_device *skb_bond(struct sk_buff *skb)
1886 struct net_device *dev = skb->dev;
1889 if (skb_bond_should_drop(skb)) {
1893 skb->dev = dev->master;
1900 static void net_tx_action(struct softirq_action *h)
1902 struct softnet_data *sd = &__get_cpu_var(softnet_data);
1904 if (sd->completion_queue) {
1905 struct sk_buff *clist;
1907 local_irq_disable();
1908 clist = sd->completion_queue;
1909 sd->completion_queue = NULL;
1913 struct sk_buff *skb = clist;
1914 clist = clist->next;
1916 BUG_TRAP(!atomic_read(&skb->users));
1921 if (sd->output_queue) {
1922 struct netdev_queue *head;
1924 local_irq_disable();
1925 head = sd->output_queue;
1926 sd->output_queue = NULL;
1930 struct netdev_queue *txq = head;
1931 struct net_device *dev = txq->dev;
1932 head = head->next_sched;
1934 smp_mb__before_clear_bit();
1935 clear_bit(__LINK_STATE_SCHED, &dev->state);
1937 if (spin_trylock(&txq->lock)) {
1939 spin_unlock(&txq->lock);
1941 netif_schedule_queue(txq);
1947 static inline int deliver_skb(struct sk_buff *skb,
1948 struct packet_type *pt_prev,
1949 struct net_device *orig_dev)
1951 atomic_inc(&skb->users);
1952 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
1955 #if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE)
1956 /* These hooks defined here for ATM */
1958 struct net_bridge_fdb_entry *(*br_fdb_get_hook)(struct net_bridge *br,
1959 unsigned char *addr);
1960 void (*br_fdb_put_hook)(struct net_bridge_fdb_entry *ent) __read_mostly;
1963 * If bridge module is loaded call bridging hook.
1964 * returns NULL if packet was consumed.
1966 struct sk_buff *(*br_handle_frame_hook)(struct net_bridge_port *p,
1967 struct sk_buff *skb) __read_mostly;
1968 static inline struct sk_buff *handle_bridge(struct sk_buff *skb,
1969 struct packet_type **pt_prev, int *ret,
1970 struct net_device *orig_dev)
1972 struct net_bridge_port *port;
1974 if (skb->pkt_type == PACKET_LOOPBACK ||
1975 (port = rcu_dereference(skb->dev->br_port)) == NULL)
1979 *ret = deliver_skb(skb, *pt_prev, orig_dev);
1983 return br_handle_frame_hook(port, skb);
1986 #define handle_bridge(skb, pt_prev, ret, orig_dev) (skb)
1989 #if defined(CONFIG_MACVLAN) || defined(CONFIG_MACVLAN_MODULE)
1990 struct sk_buff *(*macvlan_handle_frame_hook)(struct sk_buff *skb) __read_mostly;
1991 EXPORT_SYMBOL_GPL(macvlan_handle_frame_hook);
1993 static inline struct sk_buff *handle_macvlan(struct sk_buff *skb,
1994 struct packet_type **pt_prev,
1996 struct net_device *orig_dev)
1998 if (skb->dev->macvlan_port == NULL)
2002 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2005 return macvlan_handle_frame_hook(skb);
2008 #define handle_macvlan(skb, pt_prev, ret, orig_dev) (skb)
2011 #ifdef CONFIG_NET_CLS_ACT
2012 /* TODO: Maybe we should just force sch_ingress to be compiled in
2013 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
2014 * a compare and 2 stores extra right now if we dont have it on
2015 * but have CONFIG_NET_CLS_ACT
2016 * NOTE: This doesnt stop any functionality; if you dont have
2017 * the ingress scheduler, you just cant add policies on ingress.
2020 static int ing_filter(struct sk_buff *skb)
2022 struct net_device *dev = skb->dev;
2023 u32 ttl = G_TC_RTTL(skb->tc_verd);
2024 struct netdev_queue *rxq;
2025 int result = TC_ACT_OK;
2028 if (MAX_RED_LOOP < ttl++) {
2030 "Redir loop detected Dropping packet (%d->%d)\n",
2031 skb->iif, dev->ifindex);
2035 skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
2036 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
2038 rxq = &dev->rx_queue;
2040 spin_lock(&rxq->lock);
2041 if ((q = rxq->qdisc) != NULL)
2042 result = q->enqueue(skb, q);
2043 spin_unlock(&rxq->lock);
2048 static inline struct sk_buff *handle_ing(struct sk_buff *skb,
2049 struct packet_type **pt_prev,
2050 int *ret, struct net_device *orig_dev)
2052 if (!skb->dev->rx_queue.qdisc)
2056 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2059 /* Huh? Why does turning on AF_PACKET affect this? */
2060 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
2063 switch (ing_filter(skb)) {
2077 * netif_nit_deliver - deliver received packets to network taps
2080 * This function is used to deliver incoming packets to network
2081 * taps. It should be used when the normal netif_receive_skb path
2082 * is bypassed, for example because of VLAN acceleration.
2084 void netif_nit_deliver(struct sk_buff *skb)
2086 struct packet_type *ptype;
2088 if (list_empty(&ptype_all))
2091 skb_reset_network_header(skb);
2092 skb_reset_transport_header(skb);
2093 skb->mac_len = skb->network_header - skb->mac_header;
2096 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2097 if (!ptype->dev || ptype->dev == skb->dev)
2098 deliver_skb(skb, ptype, skb->dev);
2104 * netif_receive_skb - process receive buffer from network
2105 * @skb: buffer to process
2107 * netif_receive_skb() is the main receive data processing function.
2108 * It always succeeds. The buffer may be dropped during processing
2109 * for congestion control or by the protocol layers.
2111 * This function may only be called from softirq context and interrupts
2112 * should be enabled.
2114 * Return values (usually ignored):
2115 * NET_RX_SUCCESS: no congestion
2116 * NET_RX_DROP: packet was dropped
2118 int netif_receive_skb(struct sk_buff *skb)
2120 struct packet_type *ptype, *pt_prev;
2121 struct net_device *orig_dev;
2122 int ret = NET_RX_DROP;
2125 /* if we've gotten here through NAPI, check netpoll */
2126 if (netpoll_receive_skb(skb))
2129 if (!skb->tstamp.tv64)
2133 skb->iif = skb->dev->ifindex;
2135 orig_dev = skb_bond(skb);
2140 __get_cpu_var(netdev_rx_stat).total++;
2142 skb_reset_network_header(skb);
2143 skb_reset_transport_header(skb);
2144 skb->mac_len = skb->network_header - skb->mac_header;
2150 /* Don't receive packets in an exiting network namespace */
2151 if (!net_alive(dev_net(skb->dev)))
2154 #ifdef CONFIG_NET_CLS_ACT
2155 if (skb->tc_verd & TC_NCLS) {
2156 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
2161 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2162 if (!ptype->dev || ptype->dev == skb->dev) {
2164 ret = deliver_skb(skb, pt_prev, orig_dev);
2169 #ifdef CONFIG_NET_CLS_ACT
2170 skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
2176 skb = handle_bridge(skb, &pt_prev, &ret, orig_dev);
2179 skb = handle_macvlan(skb, &pt_prev, &ret, orig_dev);
2183 type = skb->protocol;
2184 list_for_each_entry_rcu(ptype,
2185 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
2186 if (ptype->type == type &&
2187 (!ptype->dev || ptype->dev == skb->dev)) {
2189 ret = deliver_skb(skb, pt_prev, orig_dev);
2195 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2198 /* Jamal, now you will not able to escape explaining
2199 * me how you were going to use this. :-)
2209 static int process_backlog(struct napi_struct *napi, int quota)
2212 struct softnet_data *queue = &__get_cpu_var(softnet_data);
2213 unsigned long start_time = jiffies;
2215 napi->weight = weight_p;
2217 struct sk_buff *skb;
2218 struct net_device *dev;
2220 local_irq_disable();
2221 skb = __skb_dequeue(&queue->input_pkt_queue);
2223 __napi_complete(napi);
2232 netif_receive_skb(skb);
2235 } while (++work < quota && jiffies == start_time);
2241 * __napi_schedule - schedule for receive
2242 * @n: entry to schedule
2244 * The entry's receive function will be scheduled to run
2246 void __napi_schedule(struct napi_struct *n)
2248 unsigned long flags;
2250 local_irq_save(flags);
2251 list_add_tail(&n->poll_list, &__get_cpu_var(softnet_data).poll_list);
2252 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2253 local_irq_restore(flags);
2255 EXPORT_SYMBOL(__napi_schedule);
2258 static void net_rx_action(struct softirq_action *h)
2260 struct list_head *list = &__get_cpu_var(softnet_data).poll_list;
2261 unsigned long start_time = jiffies;
2262 int budget = netdev_budget;
2265 local_irq_disable();
2267 while (!list_empty(list)) {
2268 struct napi_struct *n;
2271 /* If softirq window is exhuasted then punt.
2273 * Note that this is a slight policy change from the
2274 * previous NAPI code, which would allow up to 2
2275 * jiffies to pass before breaking out. The test
2276 * used to be "jiffies - start_time > 1".
2278 if (unlikely(budget <= 0 || jiffies != start_time))
2283 /* Even though interrupts have been re-enabled, this
2284 * access is safe because interrupts can only add new
2285 * entries to the tail of this list, and only ->poll()
2286 * calls can remove this head entry from the list.
2288 n = list_entry(list->next, struct napi_struct, poll_list);
2290 have = netpoll_poll_lock(n);
2294 /* This NAPI_STATE_SCHED test is for avoiding a race
2295 * with netpoll's poll_napi(). Only the entity which
2296 * obtains the lock and sees NAPI_STATE_SCHED set will
2297 * actually make the ->poll() call. Therefore we avoid
2298 * accidently calling ->poll() when NAPI is not scheduled.
2301 if (test_bit(NAPI_STATE_SCHED, &n->state))
2302 work = n->poll(n, weight);
2304 WARN_ON_ONCE(work > weight);
2308 local_irq_disable();
2310 /* Drivers must not modify the NAPI state if they
2311 * consume the entire weight. In such cases this code
2312 * still "owns" the NAPI instance and therefore can
2313 * move the instance around on the list at-will.
2315 if (unlikely(work == weight)) {
2316 if (unlikely(napi_disable_pending(n)))
2319 list_move_tail(&n->poll_list, list);
2322 netpoll_poll_unlock(have);
2327 #ifdef CONFIG_NET_DMA
2329 * There may not be any more sk_buffs coming right now, so push
2330 * any pending DMA copies to hardware
2332 if (!cpus_empty(net_dma.channel_mask)) {
2334 for_each_cpu_mask(chan_idx, net_dma.channel_mask) {
2335 struct dma_chan *chan = net_dma.channels[chan_idx];
2337 dma_async_memcpy_issue_pending(chan);
2345 __get_cpu_var(netdev_rx_stat).time_squeeze++;
2346 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2350 static gifconf_func_t * gifconf_list [NPROTO];
2353 * register_gifconf - register a SIOCGIF handler
2354 * @family: Address family
2355 * @gifconf: Function handler
2357 * Register protocol dependent address dumping routines. The handler
2358 * that is passed must not be freed or reused until it has been replaced
2359 * by another handler.
2361 int register_gifconf(unsigned int family, gifconf_func_t * gifconf)
2363 if (family >= NPROTO)
2365 gifconf_list[family] = gifconf;
2371 * Map an interface index to its name (SIOCGIFNAME)
2375 * We need this ioctl for efficient implementation of the
2376 * if_indextoname() function required by the IPv6 API. Without
2377 * it, we would have to search all the interfaces to find a
2381 static int dev_ifname(struct net *net, struct ifreq __user *arg)
2383 struct net_device *dev;
2387 * Fetch the caller's info block.
2390 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
2393 read_lock(&dev_base_lock);
2394 dev = __dev_get_by_index(net, ifr.ifr_ifindex);
2396 read_unlock(&dev_base_lock);
2400 strcpy(ifr.ifr_name, dev->name);
2401 read_unlock(&dev_base_lock);
2403 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
2409 * Perform a SIOCGIFCONF call. This structure will change
2410 * size eventually, and there is nothing I can do about it.
2411 * Thus we will need a 'compatibility mode'.
2414 static int dev_ifconf(struct net *net, char __user *arg)
2417 struct net_device *dev;
2424 * Fetch the caller's info block.
2427 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
2434 * Loop over the interfaces, and write an info block for each.
2438 for_each_netdev(net, dev) {
2439 for (i = 0; i < NPROTO; i++) {
2440 if (gifconf_list[i]) {
2443 done = gifconf_list[i](dev, NULL, 0);
2445 done = gifconf_list[i](dev, pos + total,
2455 * All done. Write the updated control block back to the caller.
2457 ifc.ifc_len = total;
2460 * Both BSD and Solaris return 0 here, so we do too.
2462 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
2465 #ifdef CONFIG_PROC_FS
2467 * This is invoked by the /proc filesystem handler to display a device
2470 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
2471 __acquires(dev_base_lock)
2473 struct net *net = seq_file_net(seq);
2475 struct net_device *dev;
2477 read_lock(&dev_base_lock);
2479 return SEQ_START_TOKEN;
2482 for_each_netdev(net, dev)
2489 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2491 struct net *net = seq_file_net(seq);
2493 return v == SEQ_START_TOKEN ?
2494 first_net_device(net) : next_net_device((struct net_device *)v);
2497 void dev_seq_stop(struct seq_file *seq, void *v)
2498 __releases(dev_base_lock)
2500 read_unlock(&dev_base_lock);
2503 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
2505 struct net_device_stats *stats = dev->get_stats(dev);
2507 seq_printf(seq, "%6s:%8lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
2508 "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n",
2509 dev->name, stats->rx_bytes, stats->rx_packets,
2511 stats->rx_dropped + stats->rx_missed_errors,
2512 stats->rx_fifo_errors,
2513 stats->rx_length_errors + stats->rx_over_errors +
2514 stats->rx_crc_errors + stats->rx_frame_errors,
2515 stats->rx_compressed, stats->multicast,
2516 stats->tx_bytes, stats->tx_packets,
2517 stats->tx_errors, stats->tx_dropped,
2518 stats->tx_fifo_errors, stats->collisions,
2519 stats->tx_carrier_errors +
2520 stats->tx_aborted_errors +
2521 stats->tx_window_errors +
2522 stats->tx_heartbeat_errors,
2523 stats->tx_compressed);
2527 * Called from the PROCfs module. This now uses the new arbitrary sized
2528 * /proc/net interface to create /proc/net/dev
2530 static int dev_seq_show(struct seq_file *seq, void *v)
2532 if (v == SEQ_START_TOKEN)
2533 seq_puts(seq, "Inter-| Receive "
2535 " face |bytes packets errs drop fifo frame "
2536 "compressed multicast|bytes packets errs "
2537 "drop fifo colls carrier compressed\n");
2539 dev_seq_printf_stats(seq, v);
2543 static struct netif_rx_stats *softnet_get_online(loff_t *pos)
2545 struct netif_rx_stats *rc = NULL;
2547 while (*pos < nr_cpu_ids)
2548 if (cpu_online(*pos)) {
2549 rc = &per_cpu(netdev_rx_stat, *pos);
2556 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
2558 return softnet_get_online(pos);
2561 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2564 return softnet_get_online(pos);
2567 static void softnet_seq_stop(struct seq_file *seq, void *v)
2571 static int softnet_seq_show(struct seq_file *seq, void *v)
2573 struct netif_rx_stats *s = v;
2575 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
2576 s->total, s->dropped, s->time_squeeze, 0,
2577 0, 0, 0, 0, /* was fastroute */
2582 static const struct seq_operations dev_seq_ops = {
2583 .start = dev_seq_start,
2584 .next = dev_seq_next,
2585 .stop = dev_seq_stop,
2586 .show = dev_seq_show,
2589 static int dev_seq_open(struct inode *inode, struct file *file)
2591 return seq_open_net(inode, file, &dev_seq_ops,
2592 sizeof(struct seq_net_private));
2595 static const struct file_operations dev_seq_fops = {
2596 .owner = THIS_MODULE,
2597 .open = dev_seq_open,
2599 .llseek = seq_lseek,
2600 .release = seq_release_net,
2603 static const struct seq_operations softnet_seq_ops = {
2604 .start = softnet_seq_start,
2605 .next = softnet_seq_next,
2606 .stop = softnet_seq_stop,
2607 .show = softnet_seq_show,
2610 static int softnet_seq_open(struct inode *inode, struct file *file)
2612 return seq_open(file, &softnet_seq_ops);
2615 static const struct file_operations softnet_seq_fops = {
2616 .owner = THIS_MODULE,
2617 .open = softnet_seq_open,
2619 .llseek = seq_lseek,
2620 .release = seq_release,
2623 static void *ptype_get_idx(loff_t pos)
2625 struct packet_type *pt = NULL;
2629 list_for_each_entry_rcu(pt, &ptype_all, list) {
2635 for (t = 0; t < PTYPE_HASH_SIZE; t++) {
2636 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
2645 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
2649 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
2652 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2654 struct packet_type *pt;
2655 struct list_head *nxt;
2659 if (v == SEQ_START_TOKEN)
2660 return ptype_get_idx(0);
2663 nxt = pt->list.next;
2664 if (pt->type == htons(ETH_P_ALL)) {
2665 if (nxt != &ptype_all)
2668 nxt = ptype_base[0].next;
2670 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
2672 while (nxt == &ptype_base[hash]) {
2673 if (++hash >= PTYPE_HASH_SIZE)
2675 nxt = ptype_base[hash].next;
2678 return list_entry(nxt, struct packet_type, list);
2681 static void ptype_seq_stop(struct seq_file *seq, void *v)
2687 static void ptype_seq_decode(struct seq_file *seq, void *sym)
2689 #ifdef CONFIG_KALLSYMS
2690 unsigned long offset = 0, symsize;
2691 const char *symname;
2695 symname = kallsyms_lookup((unsigned long)sym, &symsize, &offset,
2702 modname = delim = "";
2703 seq_printf(seq, "%s%s%s%s+0x%lx", delim, modname, delim,
2709 seq_printf(seq, "[%p]", sym);
2712 static int ptype_seq_show(struct seq_file *seq, void *v)
2714 struct packet_type *pt = v;
2716 if (v == SEQ_START_TOKEN)
2717 seq_puts(seq, "Type Device Function\n");
2718 else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
2719 if (pt->type == htons(ETH_P_ALL))
2720 seq_puts(seq, "ALL ");
2722 seq_printf(seq, "%04x", ntohs(pt->type));
2724 seq_printf(seq, " %-8s ",
2725 pt->dev ? pt->dev->name : "");
2726 ptype_seq_decode(seq, pt->func);
2727 seq_putc(seq, '\n');
2733 static const struct seq_operations ptype_seq_ops = {
2734 .start = ptype_seq_start,
2735 .next = ptype_seq_next,
2736 .stop = ptype_seq_stop,
2737 .show = ptype_seq_show,
2740 static int ptype_seq_open(struct inode *inode, struct file *file)
2742 return seq_open_net(inode, file, &ptype_seq_ops,
2743 sizeof(struct seq_net_private));
2746 static const struct file_operations ptype_seq_fops = {
2747 .owner = THIS_MODULE,
2748 .open = ptype_seq_open,
2750 .llseek = seq_lseek,
2751 .release = seq_release_net,
2755 static int __net_init dev_proc_net_init(struct net *net)
2759 if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
2761 if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
2763 if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
2766 if (wext_proc_init(net))
2772 proc_net_remove(net, "ptype");
2774 proc_net_remove(net, "softnet_stat");
2776 proc_net_remove(net, "dev");
2780 static void __net_exit dev_proc_net_exit(struct net *net)
2782 wext_proc_exit(net);
2784 proc_net_remove(net, "ptype");
2785 proc_net_remove(net, "softnet_stat");
2786 proc_net_remove(net, "dev");
2789 static struct pernet_operations __net_initdata dev_proc_ops = {
2790 .init = dev_proc_net_init,
2791 .exit = dev_proc_net_exit,
2794 static int __init dev_proc_init(void)
2796 return register_pernet_subsys(&dev_proc_ops);
2799 #define dev_proc_init() 0
2800 #endif /* CONFIG_PROC_FS */
2804 * netdev_set_master - set up master/slave pair
2805 * @slave: slave device
2806 * @master: new master device
2808 * Changes the master device of the slave. Pass %NULL to break the
2809 * bonding. The caller must hold the RTNL semaphore. On a failure
2810 * a negative errno code is returned. On success the reference counts
2811 * are adjusted, %RTM_NEWLINK is sent to the routing socket and the
2812 * function returns zero.
2814 int netdev_set_master(struct net_device *slave, struct net_device *master)
2816 struct net_device *old = slave->master;
2826 slave->master = master;
2834 slave->flags |= IFF_SLAVE;
2836 slave->flags &= ~IFF_SLAVE;
2838 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
2842 static int __dev_set_promiscuity(struct net_device *dev, int inc)
2844 unsigned short old_flags = dev->flags;
2848 dev->flags |= IFF_PROMISC;
2849 dev->promiscuity += inc;
2850 if (dev->promiscuity == 0) {
2853 * If inc causes overflow, untouch promisc and return error.
2856 dev->flags &= ~IFF_PROMISC;
2858 dev->promiscuity -= inc;
2859 printk(KERN_WARNING "%s: promiscuity touches roof, "
2860 "set promiscuity failed, promiscuity feature "
2861 "of device might be broken.\n", dev->name);
2865 if (dev->flags != old_flags) {
2866 printk(KERN_INFO "device %s %s promiscuous mode\n",
2867 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
2870 audit_log(current->audit_context, GFP_ATOMIC,
2871 AUDIT_ANOM_PROMISCUOUS,
2872 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
2873 dev->name, (dev->flags & IFF_PROMISC),
2874 (old_flags & IFF_PROMISC),
2875 audit_get_loginuid(current),
2876 current->uid, current->gid,
2877 audit_get_sessionid(current));
2879 if (dev->change_rx_flags)
2880 dev->change_rx_flags(dev, IFF_PROMISC);
2886 * dev_set_promiscuity - update promiscuity count on a device
2890 * Add or remove promiscuity from a device. While the count in the device
2891 * remains above zero the interface remains promiscuous. Once it hits zero
2892 * the device reverts back to normal filtering operation. A negative inc
2893 * value is used to drop promiscuity on the device.
2894 * Return 0 if successful or a negative errno code on error.
2896 int dev_set_promiscuity(struct net_device *dev, int inc)
2898 unsigned short old_flags = dev->flags;
2901 err = __dev_set_promiscuity(dev, inc);
2904 if (dev->flags != old_flags)
2905 dev_set_rx_mode(dev);
2910 * dev_set_allmulti - update allmulti count on a device
2914 * Add or remove reception of all multicast frames to a device. While the
2915 * count in the device remains above zero the interface remains listening
2916 * to all interfaces. Once it hits zero the device reverts back to normal
2917 * filtering operation. A negative @inc value is used to drop the counter
2918 * when releasing a resource needing all multicasts.
2919 * Return 0 if successful or a negative errno code on error.
2922 int dev_set_allmulti(struct net_device *dev, int inc)
2924 unsigned short old_flags = dev->flags;
2928 dev->flags |= IFF_ALLMULTI;
2929 dev->allmulti += inc;
2930 if (dev->allmulti == 0) {
2933 * If inc causes overflow, untouch allmulti and return error.
2936 dev->flags &= ~IFF_ALLMULTI;
2938 dev->allmulti -= inc;
2939 printk(KERN_WARNING "%s: allmulti touches roof, "
2940 "set allmulti failed, allmulti feature of "
2941 "device might be broken.\n", dev->name);
2945 if (dev->flags ^ old_flags) {
2946 if (dev->change_rx_flags)
2947 dev->change_rx_flags(dev, IFF_ALLMULTI);
2948 dev_set_rx_mode(dev);
2954 * Upload unicast and multicast address lists to device and
2955 * configure RX filtering. When the device doesn't support unicast
2956 * filtering it is put in promiscuous mode while unicast addresses
2959 void __dev_set_rx_mode(struct net_device *dev)
2961 /* dev_open will call this function so the list will stay sane. */
2962 if (!(dev->flags&IFF_UP))
2965 if (!netif_device_present(dev))
2968 if (dev->set_rx_mode)
2969 dev->set_rx_mode(dev);
2971 /* Unicast addresses changes may only happen under the rtnl,
2972 * therefore calling __dev_set_promiscuity here is safe.
2974 if (dev->uc_count > 0 && !dev->uc_promisc) {
2975 __dev_set_promiscuity(dev, 1);
2976 dev->uc_promisc = 1;
2977 } else if (dev->uc_count == 0 && dev->uc_promisc) {
2978 __dev_set_promiscuity(dev, -1);
2979 dev->uc_promisc = 0;
2982 if (dev->set_multicast_list)
2983 dev->set_multicast_list(dev);
2987 void dev_set_rx_mode(struct net_device *dev)
2989 netif_addr_lock_bh(dev);
2990 __dev_set_rx_mode(dev);
2991 netif_addr_unlock_bh(dev);
2994 int __dev_addr_delete(struct dev_addr_list **list, int *count,
2995 void *addr, int alen, int glbl)
2997 struct dev_addr_list *da;
2999 for (; (da = *list) != NULL; list = &da->next) {
3000 if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 &&
3001 alen == da->da_addrlen) {
3003 int old_glbl = da->da_gusers;
3020 int __dev_addr_add(struct dev_addr_list **list, int *count,
3021 void *addr, int alen, int glbl)
3023 struct dev_addr_list *da;
3025 for (da = *list; da != NULL; da = da->next) {
3026 if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 &&
3027 da->da_addrlen == alen) {
3029 int old_glbl = da->da_gusers;
3039 da = kzalloc(sizeof(*da), GFP_ATOMIC);
3042 memcpy(da->da_addr, addr, alen);
3043 da->da_addrlen = alen;
3045 da->da_gusers = glbl ? 1 : 0;
3053 * dev_unicast_delete - Release secondary unicast address.
3055 * @addr: address to delete
3056 * @alen: length of @addr
3058 * Release reference to a secondary unicast address and remove it
3059 * from the device if the reference count drops to zero.
3061 * The caller must hold the rtnl_mutex.
3063 int dev_unicast_delete(struct net_device *dev, void *addr, int alen)
3069 netif_addr_lock_bh(dev);
3070 err = __dev_addr_delete(&dev->uc_list, &dev->uc_count, addr, alen, 0);
3072 __dev_set_rx_mode(dev);
3073 netif_addr_unlock_bh(dev);
3076 EXPORT_SYMBOL(dev_unicast_delete);
3079 * dev_unicast_add - add a secondary unicast address
3081 * @addr: address to add
3082 * @alen: length of @addr
3084 * Add a secondary unicast address to the device or increase
3085 * the reference count if it already exists.
3087 * The caller must hold the rtnl_mutex.
3089 int dev_unicast_add(struct net_device *dev, void *addr, int alen)
3095 netif_addr_lock_bh(dev);
3096 err = __dev_addr_add(&dev->uc_list, &dev->uc_count, addr, alen, 0);
3098 __dev_set_rx_mode(dev);
3099 netif_addr_unlock_bh(dev);
3102 EXPORT_SYMBOL(dev_unicast_add);
3104 int __dev_addr_sync(struct dev_addr_list **to, int *to_count,
3105 struct dev_addr_list **from, int *from_count)
3107 struct dev_addr_list *da, *next;
3111 while (da != NULL) {
3113 if (!da->da_synced) {
3114 err = __dev_addr_add(to, to_count,
3115 da->da_addr, da->da_addrlen, 0);
3120 } else if (da->da_users == 1) {
3121 __dev_addr_delete(to, to_count,
3122 da->da_addr, da->da_addrlen, 0);
3123 __dev_addr_delete(from, from_count,
3124 da->da_addr, da->da_addrlen, 0);
3131 void __dev_addr_unsync(struct dev_addr_list **to, int *to_count,
3132 struct dev_addr_list **from, int *from_count)
3134 struct dev_addr_list *da, *next;
3137 while (da != NULL) {
3139 if (da->da_synced) {
3140 __dev_addr_delete(to, to_count,
3141 da->da_addr, da->da_addrlen, 0);
3143 __dev_addr_delete(from, from_count,
3144 da->da_addr, da->da_addrlen, 0);
3151 * dev_unicast_sync - Synchronize device's unicast list to another device
3152 * @to: destination device
3153 * @from: source device
3155 * Add newly added addresses to the destination device and release
3156 * addresses that have no users left. The source device must be
3157 * locked by netif_tx_lock_bh.
3159 * This function is intended to be called from the dev->set_rx_mode
3160 * function of layered software devices.
3162 int dev_unicast_sync(struct net_device *to, struct net_device *from)
3166 netif_addr_lock_bh(to);
3167 err = __dev_addr_sync(&to->uc_list, &to->uc_count,
3168 &from->uc_list, &from->uc_count);
3170 __dev_set_rx_mode(to);
3171 netif_addr_unlock_bh(to);
3174 EXPORT_SYMBOL(dev_unicast_sync);
3177 * dev_unicast_unsync - Remove synchronized addresses from the destination device
3178 * @to: destination device
3179 * @from: source device
3181 * Remove all addresses that were added to the destination device by
3182 * dev_unicast_sync(). This function is intended to be called from the
3183 * dev->stop function of layered software devices.
3185 void dev_unicast_unsync(struct net_device *to, struct net_device *from)
3187 netif_addr_lock_bh(from);
3188 netif_addr_lock(to);
3190 __dev_addr_unsync(&to->uc_list, &to->uc_count,
3191 &from->uc_list, &from->uc_count);
3192 __dev_set_rx_mode(to);
3194 netif_addr_unlock(to);
3195 netif_addr_unlock_bh(from);
3197 EXPORT_SYMBOL(dev_unicast_unsync);
3199 static void __dev_addr_discard(struct dev_addr_list **list)
3201 struct dev_addr_list *tmp;
3203 while (*list != NULL) {
3206 if (tmp->da_users > tmp->da_gusers)
3207 printk("__dev_addr_discard: address leakage! "
3208 "da_users=%d\n", tmp->da_users);
3213 static void dev_addr_discard(struct net_device *dev)
3215 netif_addr_lock_bh(dev);
3217 __dev_addr_discard(&dev->uc_list);
3220 __dev_addr_discard(&dev->mc_list);
3223 netif_addr_unlock_bh(dev);
3226 unsigned dev_get_flags(const struct net_device *dev)
3230 flags = (dev->flags & ~(IFF_PROMISC |
3235 (dev->gflags & (IFF_PROMISC |
3238 if (netif_running(dev)) {
3239 if (netif_oper_up(dev))
3240 flags |= IFF_RUNNING;
3241 if (netif_carrier_ok(dev))
3242 flags |= IFF_LOWER_UP;
3243 if (netif_dormant(dev))
3244 flags |= IFF_DORMANT;
3250 int dev_change_flags(struct net_device *dev, unsigned flags)
3253 int old_flags = dev->flags;
3258 * Set the flags on our device.
3261 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
3262 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
3264 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
3268 * Load in the correct multicast list now the flags have changed.
3271 if (dev->change_rx_flags && (old_flags ^ flags) & IFF_MULTICAST)
3272 dev->change_rx_flags(dev, IFF_MULTICAST);
3274 dev_set_rx_mode(dev);
3277 * Have we downed the interface. We handle IFF_UP ourselves
3278 * according to user attempts to set it, rather than blindly
3283 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
3284 ret = ((old_flags & IFF_UP) ? dev_close : dev_open)(dev);
3287 dev_set_rx_mode(dev);
3290 if (dev->flags & IFF_UP &&
3291 ((old_flags ^ dev->flags) &~ (IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
3293 call_netdevice_notifiers(NETDEV_CHANGE, dev);
3295 if ((flags ^ dev->gflags) & IFF_PROMISC) {
3296 int inc = (flags & IFF_PROMISC) ? +1 : -1;
3297 dev->gflags ^= IFF_PROMISC;
3298 dev_set_promiscuity(dev, inc);
3301 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
3302 is important. Some (broken) drivers set IFF_PROMISC, when
3303 IFF_ALLMULTI is requested not asking us and not reporting.
3305 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
3306 int inc = (flags & IFF_ALLMULTI) ? +1 : -1;
3307 dev->gflags ^= IFF_ALLMULTI;
3308 dev_set_allmulti(dev, inc);
3311 /* Exclude state transition flags, already notified */
3312 changes = (old_flags ^ dev->flags) & ~(IFF_UP | IFF_RUNNING);
3314 rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
3319 int dev_set_mtu(struct net_device *dev, int new_mtu)
3323 if (new_mtu == dev->mtu)
3326 /* MTU must be positive. */
3330 if (!netif_device_present(dev))
3334 if (dev->change_mtu)
3335 err = dev->change_mtu(dev, new_mtu);
3338 if (!err && dev->flags & IFF_UP)
3339 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
3343 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
3347 if (!dev->set_mac_address)
3349 if (sa->sa_family != dev->type)
3351 if (!netif_device_present(dev))
3353 err = dev->set_mac_address(dev, sa);
3355 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
3360 * Perform the SIOCxIFxxx calls, inside read_lock(dev_base_lock)
3362 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
3365 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
3371 case SIOCGIFFLAGS: /* Get interface flags */
3372 ifr->ifr_flags = dev_get_flags(dev);
3375 case SIOCGIFMETRIC: /* Get the metric on the interface
3376 (currently unused) */
3377 ifr->ifr_metric = 0;
3380 case SIOCGIFMTU: /* Get the MTU of a device */
3381 ifr->ifr_mtu = dev->mtu;
3386 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
3388 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
3389 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
3390 ifr->ifr_hwaddr.sa_family = dev->type;
3398 ifr->ifr_map.mem_start = dev->mem_start;
3399 ifr->ifr_map.mem_end = dev->mem_end;
3400 ifr->ifr_map.base_addr = dev->base_addr;
3401 ifr->ifr_map.irq = dev->irq;
3402 ifr->ifr_map.dma = dev->dma;
3403 ifr->ifr_map.port = dev->if_port;
3407 ifr->ifr_ifindex = dev->ifindex;
3411 ifr->ifr_qlen = dev->tx_queue_len;
3415 /* dev_ioctl() should ensure this case
3427 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
3429 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
3432 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
3438 case SIOCSIFFLAGS: /* Set interface flags */
3439 return dev_change_flags(dev, ifr->ifr_flags);
3441 case SIOCSIFMETRIC: /* Set the metric on the interface
3442 (currently unused) */
3445 case SIOCSIFMTU: /* Set the MTU of a device */
3446 return dev_set_mtu(dev, ifr->ifr_mtu);
3449 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
3451 case SIOCSIFHWBROADCAST:
3452 if (ifr->ifr_hwaddr.sa_family != dev->type)
3454 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
3455 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
3456 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
3460 if (dev->set_config) {
3461 if (!netif_device_present(dev))
3463 return dev->set_config(dev, &ifr->ifr_map);
3468 if ((!dev->set_multicast_list && !dev->set_rx_mode) ||
3469 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
3471 if (!netif_device_present(dev))
3473 return dev_mc_add(dev, ifr->ifr_hwaddr.sa_data,
3477 if ((!dev->set_multicast_list && !dev->set_rx_mode) ||
3478 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
3480 if (!netif_device_present(dev))
3482 return dev_mc_delete(dev, ifr->ifr_hwaddr.sa_data,
3486 if (ifr->ifr_qlen < 0)
3488 dev->tx_queue_len = ifr->ifr_qlen;
3492 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
3493 return dev_change_name(dev, ifr->ifr_newname);
3496 * Unknown or private ioctl
3500 if ((cmd >= SIOCDEVPRIVATE &&
3501 cmd <= SIOCDEVPRIVATE + 15) ||
3502 cmd == SIOCBONDENSLAVE ||
3503 cmd == SIOCBONDRELEASE ||
3504 cmd == SIOCBONDSETHWADDR ||
3505 cmd == SIOCBONDSLAVEINFOQUERY ||
3506 cmd == SIOCBONDINFOQUERY ||
3507 cmd == SIOCBONDCHANGEACTIVE ||
3508 cmd == SIOCGMIIPHY ||
3509 cmd == SIOCGMIIREG ||
3510 cmd == SIOCSMIIREG ||
3511 cmd == SIOCBRADDIF ||
3512 cmd == SIOCBRDELIF ||
3513 cmd == SIOCWANDEV) {
3515 if (dev->do_ioctl) {
3516 if (netif_device_present(dev))
3517 err = dev->do_ioctl(dev, ifr,
3530 * This function handles all "interface"-type I/O control requests. The actual
3531 * 'doing' part of this is dev_ifsioc above.
3535 * dev_ioctl - network device ioctl
3536 * @net: the applicable net namespace
3537 * @cmd: command to issue
3538 * @arg: pointer to a struct ifreq in user space
3540 * Issue ioctl functions to devices. This is normally called by the
3541 * user space syscall interfaces but can sometimes be useful for
3542 * other purposes. The return value is the return from the syscall if
3543 * positive or a negative errno code on error.
3546 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
3552 /* One special case: SIOCGIFCONF takes ifconf argument
3553 and requires shared lock, because it sleeps writing
3557 if (cmd == SIOCGIFCONF) {
3559 ret = dev_ifconf(net, (char __user *) arg);
3563 if (cmd == SIOCGIFNAME)
3564 return dev_ifname(net, (struct ifreq __user *)arg);
3566 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
3569 ifr.ifr_name[IFNAMSIZ-1] = 0;
3571 colon = strchr(ifr.ifr_name, ':');
3576 * See which interface the caller is talking about.
3581 * These ioctl calls:
3582 * - can be done by all.
3583 * - atomic and do not require locking.
3594 dev_load(net, ifr.ifr_name);
3595 read_lock(&dev_base_lock);
3596 ret = dev_ifsioc_locked(net, &ifr, cmd);
3597 read_unlock(&dev_base_lock);
3601 if (copy_to_user(arg, &ifr,
3602 sizeof(struct ifreq)))
3608 dev_load(net, ifr.ifr_name);
3610 ret = dev_ethtool(net, &ifr);
3615 if (copy_to_user(arg, &ifr,
3616 sizeof(struct ifreq)))
3622 * These ioctl calls:
3623 * - require superuser power.
3624 * - require strict serialization.
3630 if (!capable(CAP_NET_ADMIN))
3632 dev_load(net, ifr.ifr_name);
3634 ret = dev_ifsioc(net, &ifr, cmd);
3639 if (copy_to_user(arg, &ifr,
3640 sizeof(struct ifreq)))
3646 * These ioctl calls:
3647 * - require superuser power.
3648 * - require strict serialization.
3649 * - do not return a value
3659 case SIOCSIFHWBROADCAST:
3662 case SIOCBONDENSLAVE:
3663 case SIOCBONDRELEASE:
3664 case SIOCBONDSETHWADDR:
3665 case SIOCBONDCHANGEACTIVE:
3668 if (!capable(CAP_NET_ADMIN))
3671 case SIOCBONDSLAVEINFOQUERY:
3672 case SIOCBONDINFOQUERY:
3673 dev_load(net, ifr.ifr_name);
3675 ret = dev_ifsioc(net, &ifr, cmd);
3680 /* Get the per device memory space. We can add this but
3681 * currently do not support it */
3683 /* Set the per device memory buffer space.
3684 * Not applicable in our case */
3689 * Unknown or private ioctl.
3692 if (cmd == SIOCWANDEV ||
3693 (cmd >= SIOCDEVPRIVATE &&
3694 cmd <= SIOCDEVPRIVATE + 15)) {
3695 dev_load(net, ifr.ifr_name);
3697 ret = dev_ifsioc(net, &ifr, cmd);
3699 if (!ret && copy_to_user(arg, &ifr,
3700 sizeof(struct ifreq)))
3704 /* Take care of Wireless Extensions */
3705 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
3706 return wext_handle_ioctl(net, &ifr, cmd, arg);
3713 * dev_new_index - allocate an ifindex
3714 * @net: the applicable net namespace
3716 * Returns a suitable unique value for a new device interface
3717 * number. The caller must hold the rtnl semaphore or the
3718 * dev_base_lock to be sure it remains unique.
3720 static int dev_new_index(struct net *net)
3726 if (!__dev_get_by_index(net, ifindex))
3731 /* Delayed registration/unregisteration */
3732 static DEFINE_SPINLOCK(net_todo_list_lock);
3733 static LIST_HEAD(net_todo_list);
3735 static void net_set_todo(struct net_device *dev)
3737 spin_lock(&net_todo_list_lock);
3738 list_add_tail(&dev->todo_list, &net_todo_list);
3739 spin_unlock(&net_todo_list_lock);
3742 static void rollback_registered(struct net_device *dev)
3744 BUG_ON(dev_boot_phase);
3747 /* Some devices call without registering for initialization unwind. */
3748 if (dev->reg_state == NETREG_UNINITIALIZED) {
3749 printk(KERN_DEBUG "unregister_netdevice: device %s/%p never "
3750 "was registered\n", dev->name, dev);
3756 BUG_ON(dev->reg_state != NETREG_REGISTERED);
3758 /* If device is running, close it first. */
3761 /* And unlink it from device chain. */
3762 unlist_netdevice(dev);
3764 dev->reg_state = NETREG_UNREGISTERING;
3768 /* Shutdown queueing discipline. */
3772 /* Notify protocols, that we are about to destroy
3773 this device. They should clean all the things.
3775 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
3778 * Flush the unicast and multicast chains
3780 dev_addr_discard(dev);
3785 /* Notifier chain MUST detach us from master device. */
3786 BUG_TRAP(!dev->master);
3788 /* Remove entries from kobject tree */
3789 netdev_unregister_kobject(dev);
3796 static void __netdev_init_queue_locks_one(struct net_device *dev,
3797 struct netdev_queue *dev_queue,
3800 spin_lock_init(&dev_queue->_xmit_lock);
3801 netdev_set_lockdep_class(&dev_queue->_xmit_lock, dev->type);
3802 dev_queue->xmit_lock_owner = -1;
3805 static void netdev_init_queue_locks(struct net_device *dev)
3807 netdev_for_each_tx_queue(dev, __netdev_init_queue_locks_one, NULL);
3808 __netdev_init_queue_locks_one(dev, &dev->rx_queue, NULL);
3812 * register_netdevice - register a network device
3813 * @dev: device to register
3815 * Take a completed network device structure and add it to the kernel
3816 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
3817 * chain. 0 is returned on success. A negative errno code is returned
3818 * on a failure to set up the device, or if the name is a duplicate.
3820 * Callers must hold the rtnl semaphore. You may want
3821 * register_netdev() instead of this.
3824 * The locking appears insufficient to guarantee two parallel registers
3825 * will not get the same name.
3828 int register_netdevice(struct net_device *dev)
3830 struct hlist_head *head;
3831 struct hlist_node *p;
3835 BUG_ON(dev_boot_phase);
3840 /* When net_device's are persistent, this will be fatal. */
3841 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
3842 BUG_ON(!dev_net(dev));
3845 spin_lock_init(&dev->addr_list_lock);
3846 netdev_init_queue_locks(dev);
3850 /* Init, if this function is available */
3852 ret = dev->init(dev);
3860 if (!dev_valid_name(dev->name)) {
3865 dev->ifindex = dev_new_index(net);
3866 if (dev->iflink == -1)
3867 dev->iflink = dev->ifindex;
3869 /* Check for existence of name */
3870 head = dev_name_hash(net, dev->name);
3871 hlist_for_each(p, head) {
3872 struct net_device *d
3873 = hlist_entry(p, struct net_device, name_hlist);
3874 if (!strncmp(d->name, dev->name, IFNAMSIZ)) {
3880 /* Fix illegal checksum combinations */
3881 if ((dev->features & NETIF_F_HW_CSUM) &&
3882 (dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
3883 printk(KERN_NOTICE "%s: mixed HW and IP checksum settings.\n",
3885 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
3888 if ((dev->features & NETIF_F_NO_CSUM) &&
3889 (dev->features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
3890 printk(KERN_NOTICE "%s: mixed no checksumming and other settings.\n",
3892 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
3896 /* Fix illegal SG+CSUM combinations. */
3897 if ((dev->features & NETIF_F_SG) &&
3898 !(dev->features & NETIF_F_ALL_CSUM)) {
3899 printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no checksum feature.\n",
3901 dev->features &= ~NETIF_F_SG;
3904 /* TSO requires that SG is present as well. */
3905 if ((dev->features & NETIF_F_TSO) &&
3906 !(dev->features & NETIF_F_SG)) {
3907 printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no SG feature.\n",
3909 dev->features &= ~NETIF_F_TSO;
3911 if (dev->features & NETIF_F_UFO) {
3912 if (!(dev->features & NETIF_F_HW_CSUM)) {
3913 printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no "
3914 "NETIF_F_HW_CSUM feature.\n",
3916 dev->features &= ~NETIF_F_UFO;
3918 if (!(dev->features & NETIF_F_SG)) {
3919 printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no "
3920 "NETIF_F_SG feature.\n",
3922 dev->features &= ~NETIF_F_UFO;
3926 netdev_initialize_kobject(dev);
3927 ret = netdev_register_kobject(dev);
3930 dev->reg_state = NETREG_REGISTERED;
3933 * Default initial state at registry is that the
3934 * device is present.
3937 set_bit(__LINK_STATE_PRESENT, &dev->state);
3939 dev_init_scheduler(dev);
3941 list_netdevice(dev);
3943 /* Notify protocols, that a new device appeared. */
3944 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
3945 ret = notifier_to_errno(ret);
3947 rollback_registered(dev);
3948 dev->reg_state = NETREG_UNREGISTERED;
3961 * register_netdev - register a network device
3962 * @dev: device to register
3964 * Take a completed network device structure and add it to the kernel
3965 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
3966 * chain. 0 is returned on success. A negative errno code is returned
3967 * on a failure to set up the device, or if the name is a duplicate.
3969 * This is a wrapper around register_netdevice that takes the rtnl semaphore
3970 * and expands the device name if you passed a format string to
3973 int register_netdev(struct net_device *dev)
3980 * If the name is a format string the caller wants us to do a
3983 if (strchr(dev->name, '%')) {
3984 err = dev_alloc_name(dev, dev->name);
3989 err = register_netdevice(dev);
3994 EXPORT_SYMBOL(register_netdev);
3997 * netdev_wait_allrefs - wait until all references are gone.
3999 * This is called when unregistering network devices.
4001 * Any protocol or device that holds a reference should register
4002 * for netdevice notification, and cleanup and put back the
4003 * reference if they receive an UNREGISTER event.
4004 * We can get stuck here if buggy protocols don't correctly
4007 static void netdev_wait_allrefs(struct net_device *dev)
4009 unsigned long rebroadcast_time, warning_time;
4011 rebroadcast_time = warning_time = jiffies;
4012 while (atomic_read(&dev->refcnt) != 0) {
4013 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
4016 /* Rebroadcast unregister notification */
4017 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
4019 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
4021 /* We must not have linkwatch events
4022 * pending on unregister. If this
4023 * happens, we simply run the queue
4024 * unscheduled, resulting in a noop
4027 linkwatch_run_queue();
4032 rebroadcast_time = jiffies;
4037 if (time_after(jiffies, warning_time + 10 * HZ)) {
4038 printk(KERN_EMERG "unregister_netdevice: "
4039 "waiting for %s to become free. Usage "
4041 dev->name, atomic_read(&dev->refcnt));
4042 warning_time = jiffies;
4051 * register_netdevice(x1);
4052 * register_netdevice(x2);
4054 * unregister_netdevice(y1);
4055 * unregister_netdevice(y2);
4061 * We are invoked by rtnl_unlock() after it drops the semaphore.
4062 * This allows us to deal with problems:
4063 * 1) We can delete sysfs objects which invoke hotplug
4064 * without deadlocking with linkwatch via keventd.
4065 * 2) Since we run with the RTNL semaphore not held, we can sleep
4066 * safely in order to wait for the netdev refcnt to drop to zero.
4068 static DEFINE_MUTEX(net_todo_run_mutex);
4069 void netdev_run_todo(void)
4071 struct list_head list;
4073 /* Need to guard against multiple cpu's getting out of order. */
4074 mutex_lock(&net_todo_run_mutex);
4076 /* Not safe to do outside the semaphore. We must not return
4077 * until all unregister events invoked by the local processor
4078 * have been completed (either by this todo run, or one on
4081 if (list_empty(&net_todo_list))
4084 /* Snapshot list, allow later requests */
4085 spin_lock(&net_todo_list_lock);
4086 list_replace_init(&net_todo_list, &list);
4087 spin_unlock(&net_todo_list_lock);
4089 while (!list_empty(&list)) {
4090 struct net_device *dev
4091 = list_entry(list.next, struct net_device, todo_list);
4092 list_del(&dev->todo_list);
4094 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
4095 printk(KERN_ERR "network todo '%s' but state %d\n",
4096 dev->name, dev->reg_state);
4101 dev->reg_state = NETREG_UNREGISTERED;
4103 netdev_wait_allrefs(dev);
4106 BUG_ON(atomic_read(&dev->refcnt));
4107 BUG_TRAP(!dev->ip_ptr);
4108 BUG_TRAP(!dev->ip6_ptr);
4109 BUG_TRAP(!dev->dn_ptr);
4111 if (dev->destructor)
4112 dev->destructor(dev);
4114 /* Free network device */
4115 kobject_put(&dev->dev.kobj);
4119 mutex_unlock(&net_todo_run_mutex);
4122 static struct net_device_stats *internal_stats(struct net_device *dev)
4127 static void netdev_init_one_queue(struct net_device *dev,
4128 struct netdev_queue *queue,
4131 spin_lock_init(&queue->lock);
4135 static void netdev_init_queues(struct net_device *dev)
4137 netdev_init_one_queue(dev, &dev->rx_queue, NULL);
4138 netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
4142 * alloc_netdev_mq - allocate network device
4143 * @sizeof_priv: size of private data to allocate space for
4144 * @name: device name format string
4145 * @setup: callback to initialize device
4146 * @queue_count: the number of subqueues to allocate
4148 * Allocates a struct net_device with private data area for driver use
4149 * and performs basic initialization. Also allocates subquue structs
4150 * for each queue on the device at the end of the netdevice.
4152 struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
4153 void (*setup)(struct net_device *), unsigned int queue_count)
4155 struct netdev_queue *tx;
4156 struct net_device *dev;
4160 BUG_ON(strlen(name) >= sizeof(dev->name));
4162 alloc_size = sizeof(struct net_device);
4164 /* ensure 32-byte alignment of private area */
4165 alloc_size = (alloc_size + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST;
4166 alloc_size += sizeof_priv;
4168 /* ensure 32-byte alignment of whole construct */
4169 alloc_size += NETDEV_ALIGN_CONST;
4171 p = kzalloc(alloc_size, GFP_KERNEL);
4173 printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
4177 tx = kzalloc(sizeof(struct netdev_queue) * queue_count, GFP_KERNEL);
4179 printk(KERN_ERR "alloc_netdev: Unable to allocate "
4185 dev = (struct net_device *)
4186 (((long)p + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
4187 dev->padded = (char *)dev - (char *)p;
4188 dev_net_set(dev, &init_net);
4191 dev->num_tx_queues = queue_count;
4192 dev->real_num_tx_queues = queue_count;
4195 dev->priv = ((char *)dev +
4196 ((sizeof(struct net_device) + NETDEV_ALIGN_CONST)
4197 & ~NETDEV_ALIGN_CONST));
4200 dev->gso_max_size = GSO_MAX_SIZE;
4202 netdev_init_queues(dev);
4204 dev->get_stats = internal_stats;
4205 netpoll_netdev_init(dev);
4207 strcpy(dev->name, name);
4210 EXPORT_SYMBOL(alloc_netdev_mq);
4213 * free_netdev - free network device
4216 * This function does the last stage of destroying an allocated device
4217 * interface. The reference to the device object is released.
4218 * If this is the last reference then it will be freed.
4220 void free_netdev(struct net_device *dev)
4222 release_net(dev_net(dev));
4226 /* Compatibility with error handling in drivers */
4227 if (dev->reg_state == NETREG_UNINITIALIZED) {
4228 kfree((char *)dev - dev->padded);
4232 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
4233 dev->reg_state = NETREG_RELEASED;
4235 /* will free via device release */
4236 put_device(&dev->dev);
4239 /* Synchronize with packet receive processing. */
4240 void synchronize_net(void)
4247 * unregister_netdevice - remove device from the kernel
4250 * This function shuts down a device interface and removes it
4251 * from the kernel tables.
4253 * Callers must hold the rtnl semaphore. You may want
4254 * unregister_netdev() instead of this.
4257 void unregister_netdevice(struct net_device *dev)
4261 rollback_registered(dev);
4262 /* Finish processing unregister after unlock */
4267 * unregister_netdev - remove device from the kernel
4270 * This function shuts down a device interface and removes it
4271 * from the kernel tables.
4273 * This is just a wrapper for unregister_netdevice that takes
4274 * the rtnl semaphore. In general you want to use this and not
4275 * unregister_netdevice.
4277 void unregister_netdev(struct net_device *dev)
4280 unregister_netdevice(dev);
4284 EXPORT_SYMBOL(unregister_netdev);
4287 * dev_change_net_namespace - move device to different nethost namespace
4289 * @net: network namespace
4290 * @pat: If not NULL name pattern to try if the current device name
4291 * is already taken in the destination network namespace.
4293 * This function shuts down a device interface and moves it
4294 * to a new network namespace. On success 0 is returned, on
4295 * a failure a netagive errno code is returned.
4297 * Callers must hold the rtnl semaphore.
4300 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
4303 const char *destname;
4308 /* Don't allow namespace local devices to be moved. */
4310 if (dev->features & NETIF_F_NETNS_LOCAL)
4313 /* Ensure the device has been registrered */
4315 if (dev->reg_state != NETREG_REGISTERED)
4318 /* Get out if there is nothing todo */
4320 if (net_eq(dev_net(dev), net))
4323 /* Pick the destination device name, and ensure
4324 * we can use it in the destination network namespace.
4327 destname = dev->name;
4328 if (__dev_get_by_name(net, destname)) {
4329 /* We get here if we can't use the current device name */
4332 if (!dev_valid_name(pat))
4334 if (strchr(pat, '%')) {
4335 if (__dev_alloc_name(net, pat, buf) < 0)
4340 if (__dev_get_by_name(net, destname))
4345 * And now a mini version of register_netdevice unregister_netdevice.
4348 /* If device is running close it first. */
4351 /* And unlink it from device chain */
4353 unlist_netdevice(dev);
4357 /* Shutdown queueing discipline. */
4360 /* Notify protocols, that we are about to destroy
4361 this device. They should clean all the things.
4363 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
4366 * Flush the unicast and multicast chains
4368 dev_addr_discard(dev);
4370 /* Actually switch the network namespace */
4371 dev_net_set(dev, net);
4373 /* Assign the new device name */
4374 if (destname != dev->name)
4375 strcpy(dev->name, destname);
4377 /* If there is an ifindex conflict assign a new one */
4378 if (__dev_get_by_index(net, dev->ifindex)) {
4379 int iflink = (dev->iflink == dev->ifindex);
4380 dev->ifindex = dev_new_index(net);
4382 dev->iflink = dev->ifindex;
4385 /* Fixup kobjects */
4386 netdev_unregister_kobject(dev);
4387 err = netdev_register_kobject(dev);
4390 /* Add the device back in the hashes */
4391 list_netdevice(dev);
4393 /* Notify protocols, that a new device appeared. */
4394 call_netdevice_notifiers(NETDEV_REGISTER, dev);
4402 static int dev_cpu_callback(struct notifier_block *nfb,
4403 unsigned long action,
4406 struct sk_buff **list_skb;
4407 struct netdev_queue **list_net;
4408 struct sk_buff *skb;
4409 unsigned int cpu, oldcpu = (unsigned long)ocpu;
4410 struct softnet_data *sd, *oldsd;
4412 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
4415 local_irq_disable();
4416 cpu = smp_processor_id();
4417 sd = &per_cpu(softnet_data, cpu);
4418 oldsd = &per_cpu(softnet_data, oldcpu);
4420 /* Find end of our completion_queue. */
4421 list_skb = &sd->completion_queue;
4423 list_skb = &(*list_skb)->next;
4424 /* Append completion queue from offline CPU. */
4425 *list_skb = oldsd->completion_queue;
4426 oldsd->completion_queue = NULL;
4428 /* Find end of our output_queue. */
4429 list_net = &sd->output_queue;
4431 list_net = &(*list_net)->next_sched;
4432 /* Append output queue from offline CPU. */
4433 *list_net = oldsd->output_queue;
4434 oldsd->output_queue = NULL;
4436 raise_softirq_irqoff(NET_TX_SOFTIRQ);
4439 /* Process offline CPU's input_pkt_queue */
4440 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue)))
4446 #ifdef CONFIG_NET_DMA
4448 * net_dma_rebalance - try to maintain one DMA channel per CPU
4449 * @net_dma: DMA client and associated data (lock, channels, channel_mask)
4451 * This is called when the number of channels allocated to the net_dma client
4452 * changes. The net_dma client tries to have one DMA channel per CPU.
4455 static void net_dma_rebalance(struct net_dma *net_dma)
4457 unsigned int cpu, i, n, chan_idx;
4458 struct dma_chan *chan;
4460 if (cpus_empty(net_dma->channel_mask)) {
4461 for_each_online_cpu(cpu)
4462 rcu_assign_pointer(per_cpu(softnet_data, cpu).net_dma, NULL);
4467 cpu = first_cpu(cpu_online_map);
4469 for_each_cpu_mask(chan_idx, net_dma->channel_mask) {
4470 chan = net_dma->channels[chan_idx];
4472 n = ((num_online_cpus() / cpus_weight(net_dma->channel_mask))
4473 + (i < (num_online_cpus() %
4474 cpus_weight(net_dma->channel_mask)) ? 1 : 0));
4477 per_cpu(softnet_data, cpu).net_dma = chan;
4478 cpu = next_cpu(cpu, cpu_online_map);
4486 * netdev_dma_event - event callback for the net_dma_client
4487 * @client: should always be net_dma_client
4488 * @chan: DMA channel for the event
4489 * @state: DMA state to be handled
4491 static enum dma_state_client
4492 netdev_dma_event(struct dma_client *client, struct dma_chan *chan,
4493 enum dma_state state)
4495 int i, found = 0, pos = -1;
4496 struct net_dma *net_dma =
4497 container_of(client, struct net_dma, client);
4498 enum dma_state_client ack = DMA_DUP; /* default: take no action */
4500 spin_lock(&net_dma->lock);
4502 case DMA_RESOURCE_AVAILABLE:
4503 for (i = 0; i < nr_cpu_ids; i++)
4504 if (net_dma->channels[i] == chan) {
4507 } else if (net_dma->channels[i] == NULL && pos < 0)
4510 if (!found && pos >= 0) {
4512 net_dma->channels[pos] = chan;
4513 cpu_set(pos, net_dma->channel_mask);
4514 net_dma_rebalance(net_dma);
4517 case DMA_RESOURCE_REMOVED:
4518 for (i = 0; i < nr_cpu_ids; i++)
4519 if (net_dma->channels[i] == chan) {
4527 cpu_clear(pos, net_dma->channel_mask);
4528 net_dma->channels[i] = NULL;
4529 net_dma_rebalance(net_dma);
4535 spin_unlock(&net_dma->lock);
4541 * netdev_dma_regiser - register the networking subsystem as a DMA client
4543 static int __init netdev_dma_register(void)
4545 net_dma.channels = kzalloc(nr_cpu_ids * sizeof(struct net_dma),
4547 if (unlikely(!net_dma.channels)) {
4549 "netdev_dma: no memory for net_dma.channels\n");
4552 spin_lock_init(&net_dma.lock);
4553 dma_cap_set(DMA_MEMCPY, net_dma.client.cap_mask);
4554 dma_async_client_register(&net_dma.client);
4555 dma_async_client_chan_request(&net_dma.client);
4560 static int __init netdev_dma_register(void) { return -ENODEV; }
4561 #endif /* CONFIG_NET_DMA */
4564 * netdev_compute_feature - compute conjunction of two feature sets
4565 * @all: first feature set
4566 * @one: second feature set
4568 * Computes a new feature set after adding a device with feature set
4569 * @one to the master device with current feature set @all. Returns
4570 * the new feature set.
4572 int netdev_compute_features(unsigned long all, unsigned long one)
4574 /* if device needs checksumming, downgrade to hw checksumming */
4575 if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM))
4576 all ^= NETIF_F_NO_CSUM | NETIF_F_HW_CSUM;
4578 /* if device can't do all checksum, downgrade to ipv4/ipv6 */
4579 if (all & NETIF_F_HW_CSUM && !(one & NETIF_F_HW_CSUM))
4580 all ^= NETIF_F_HW_CSUM
4581 | NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
4583 if (one & NETIF_F_GSO)
4584 one |= NETIF_F_GSO_SOFTWARE;
4587 /* If even one device supports robust GSO, enable it for all. */
4588 if (one & NETIF_F_GSO_ROBUST)
4589 all |= NETIF_F_GSO_ROBUST;
4591 all &= one | NETIF_F_LLTX;
4593 if (!(all & NETIF_F_ALL_CSUM))
4595 if (!(all & NETIF_F_SG))
4596 all &= ~NETIF_F_GSO_MASK;
4600 EXPORT_SYMBOL(netdev_compute_features);
4602 static struct hlist_head *netdev_create_hash(void)
4605 struct hlist_head *hash;
4607 hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
4609 for (i = 0; i < NETDEV_HASHENTRIES; i++)
4610 INIT_HLIST_HEAD(&hash[i]);
4615 /* Initialize per network namespace state */
4616 static int __net_init netdev_init(struct net *net)
4618 INIT_LIST_HEAD(&net->dev_base_head);
4620 net->dev_name_head = netdev_create_hash();
4621 if (net->dev_name_head == NULL)
4624 net->dev_index_head = netdev_create_hash();
4625 if (net->dev_index_head == NULL)
4631 kfree(net->dev_name_head);
4636 static void __net_exit netdev_exit(struct net *net)
4638 kfree(net->dev_name_head);
4639 kfree(net->dev_index_head);
4642 static struct pernet_operations __net_initdata netdev_net_ops = {
4643 .init = netdev_init,
4644 .exit = netdev_exit,
4647 static void __net_exit default_device_exit(struct net *net)
4649 struct net_device *dev, *next;
4651 * Push all migratable of the network devices back to the
4652 * initial network namespace
4655 for_each_netdev_safe(net, dev, next) {
4657 char fb_name[IFNAMSIZ];
4659 /* Ignore unmoveable devices (i.e. loopback) */
4660 if (dev->features & NETIF_F_NETNS_LOCAL)
4663 /* Push remaing network devices to init_net */
4664 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
4665 err = dev_change_net_namespace(dev, &init_net, fb_name);
4667 printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
4668 __func__, dev->name, err);
4675 static struct pernet_operations __net_initdata default_device_ops = {
4676 .exit = default_device_exit,
4680 * Initialize the DEV module. At boot time this walks the device list and
4681 * unhooks any devices that fail to initialise (normally hardware not
4682 * present) and leaves us with a valid list of present and active devices.
4687 * This is called single threaded during boot, so no need
4688 * to take the rtnl semaphore.
4690 static int __init net_dev_init(void)
4692 int i, rc = -ENOMEM;
4694 BUG_ON(!dev_boot_phase);
4696 if (dev_proc_init())
4699 if (netdev_kobject_init())
4702 INIT_LIST_HEAD(&ptype_all);
4703 for (i = 0; i < PTYPE_HASH_SIZE; i++)
4704 INIT_LIST_HEAD(&ptype_base[i]);
4706 if (register_pernet_subsys(&netdev_net_ops))
4709 if (register_pernet_device(&default_device_ops))
4713 * Initialise the packet receive queues.
4716 for_each_possible_cpu(i) {
4717 struct softnet_data *queue;
4719 queue = &per_cpu(softnet_data, i);
4720 skb_queue_head_init(&queue->input_pkt_queue);
4721 queue->completion_queue = NULL;
4722 INIT_LIST_HEAD(&queue->poll_list);
4724 queue->backlog.poll = process_backlog;
4725 queue->backlog.weight = weight_p;
4728 netdev_dma_register();
4732 open_softirq(NET_TX_SOFTIRQ, net_tx_action, NULL);
4733 open_softirq(NET_RX_SOFTIRQ, net_rx_action, NULL);
4735 hotcpu_notifier(dev_cpu_callback, 0);
4743 subsys_initcall(net_dev_init);
4745 EXPORT_SYMBOL(__dev_get_by_index);
4746 EXPORT_SYMBOL(__dev_get_by_name);
4747 EXPORT_SYMBOL(__dev_remove_pack);
4748 EXPORT_SYMBOL(dev_valid_name);
4749 EXPORT_SYMBOL(dev_add_pack);
4750 EXPORT_SYMBOL(dev_alloc_name);
4751 EXPORT_SYMBOL(dev_close);
4752 EXPORT_SYMBOL(dev_get_by_flags);
4753 EXPORT_SYMBOL(dev_get_by_index);
4754 EXPORT_SYMBOL(dev_get_by_name);
4755 EXPORT_SYMBOL(dev_open);
4756 EXPORT_SYMBOL(dev_queue_xmit);
4757 EXPORT_SYMBOL(dev_remove_pack);
4758 EXPORT_SYMBOL(dev_set_allmulti);
4759 EXPORT_SYMBOL(dev_set_promiscuity);
4760 EXPORT_SYMBOL(dev_change_flags);
4761 EXPORT_SYMBOL(dev_set_mtu);
4762 EXPORT_SYMBOL(dev_set_mac_address);
4763 EXPORT_SYMBOL(free_netdev);
4764 EXPORT_SYMBOL(netdev_boot_setup_check);
4765 EXPORT_SYMBOL(netdev_set_master);
4766 EXPORT_SYMBOL(netdev_state_change);
4767 EXPORT_SYMBOL(netif_receive_skb);
4768 EXPORT_SYMBOL(netif_rx);
4769 EXPORT_SYMBOL(register_gifconf);
4770 EXPORT_SYMBOL(register_netdevice);
4771 EXPORT_SYMBOL(register_netdevice_notifier);
4772 EXPORT_SYMBOL(skb_checksum_help);
4773 EXPORT_SYMBOL(synchronize_net);
4774 EXPORT_SYMBOL(unregister_netdevice);
4775 EXPORT_SYMBOL(unregister_netdevice_notifier);
4776 EXPORT_SYMBOL(net_enable_timestamp);
4777 EXPORT_SYMBOL(net_disable_timestamp);
4778 EXPORT_SYMBOL(dev_get_flags);
4780 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
4781 EXPORT_SYMBOL(br_handle_frame_hook);
4782 EXPORT_SYMBOL(br_fdb_get_hook);
4783 EXPORT_SYMBOL(br_fdb_put_hook);
4787 EXPORT_SYMBOL(dev_load);
4790 EXPORT_PER_CPU_SYMBOL(softnet_data);