2 * NET3 Protocol independent device support routines.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
9 * Derived from the non IP parts of dev.c 1.0.19
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Mark Evans, <evansmp@uhura.aston.ac.uk>
15 * Florian la Roche <rzsfl@rz.uni-sb.de>
16 * Alan Cox <gw4pts@gw4pts.ampr.org>
17 * David Hinds <dahinds@users.sourceforge.net>
18 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
19 * Adam Sulmicki <adam@cfar.umd.edu>
20 * Pekka Riikonen <priikone@poesidon.pspt.fi>
23 * D.J. Barrow : Fixed bug where dev->refcnt gets set
24 * to 2 if register_netdev gets called
25 * before net_dev_init & also removed a
26 * few lines of code in the process.
27 * Alan Cox : device private ioctl copies fields back.
28 * Alan Cox : Transmit queue code does relevant
29 * stunts to keep the queue safe.
30 * Alan Cox : Fixed double lock.
31 * Alan Cox : Fixed promisc NULL pointer trap
32 * ???????? : Support the full private ioctl range
33 * Alan Cox : Moved ioctl permission check into
35 * Tim Kordas : SIOCADDMULTI/SIOCDELMULTI
36 * Alan Cox : 100 backlog just doesn't cut it when
37 * you start doing multicast video 8)
38 * Alan Cox : Rewrote net_bh and list manager.
39 * Alan Cox : Fix ETH_P_ALL echoback lengths.
40 * Alan Cox : Took out transmit every packet pass
41 * Saved a few bytes in the ioctl handler
42 * Alan Cox : Network driver sets packet type before
43 * calling netif_rx. Saves a function
45 * Alan Cox : Hashed net_bh()
46 * Richard Kooijman: Timestamp fixes.
47 * Alan Cox : Wrong field in SIOCGIFDSTADDR
48 * Alan Cox : Device lock protection.
49 * Alan Cox : Fixed nasty side effect of device close
51 * Rudi Cilibrasi : Pass the right thing to
53 * Dave Miller : 32bit quantity for the device lock to
54 * make it work out on a Sparc.
55 * Bjorn Ekwall : Added KERNELD hack.
56 * Alan Cox : Cleaned up the backlog initialise.
57 * Craig Metz : SIOCGIFCONF fix if space for under
59 * Thomas Bogendoerfer : Return ENODEV for dev_open, if there
60 * is no device open function.
61 * Andi Kleen : Fix error reporting for SIOCGIFCONF
62 * Michael Chastain : Fix signed/unsigned for SIOCGIFCONF
63 * Cyrus Durgin : Cleaned for KMOD
64 * Adam Sulmicki : Bug Fix : Network Device Unload
65 * A network device unload needs to purge
67 * Paul Rusty Russell : SIOCSIFNAME
68 * Pekka Riikonen : Netdev boot-time settings code
69 * Andrew Morton : Make unregister_netdevice wait
70 * indefinitely on dev->refcnt
71 * J Hadi Salim : - Backlog queue sampling
72 * - netif_rx() feedback
75 #include <asm/uaccess.h>
76 #include <asm/system.h>
77 #include <linux/bitops.h>
78 #include <linux/capability.h>
79 #include <linux/cpu.h>
80 #include <linux/types.h>
81 #include <linux/kernel.h>
82 #include <linux/hash.h>
83 #include <linux/slab.h>
84 #include <linux/sched.h>
85 #include <linux/mutex.h>
86 #include <linux/string.h>
88 #include <linux/socket.h>
89 #include <linux/sockios.h>
90 #include <linux/errno.h>
91 #include <linux/interrupt.h>
92 #include <linux/if_ether.h>
93 #include <linux/netdevice.h>
94 #include <linux/etherdevice.h>
95 #include <linux/ethtool.h>
96 #include <linux/notifier.h>
97 #include <linux/skbuff.h>
98 #include <net/net_namespace.h>
100 #include <linux/rtnetlink.h>
101 #include <linux/proc_fs.h>
102 #include <linux/seq_file.h>
103 #include <linux/stat.h>
105 #include <net/pkt_sched.h>
106 #include <net/checksum.h>
107 #include <net/xfrm.h>
108 #include <linux/highmem.h>
109 #include <linux/init.h>
110 #include <linux/kmod.h>
111 #include <linux/module.h>
112 #include <linux/netpoll.h>
113 #include <linux/rcupdate.h>
114 #include <linux/delay.h>
115 #include <net/wext.h>
116 #include <net/iw_handler.h>
117 #include <asm/current.h>
118 #include <linux/audit.h>
119 #include <linux/dmaengine.h>
120 #include <linux/err.h>
121 #include <linux/ctype.h>
122 #include <linux/if_arp.h>
123 #include <linux/if_vlan.h>
124 #include <linux/ip.h>
126 #include <linux/ipv6.h>
127 #include <linux/in.h>
128 #include <linux/jhash.h>
129 #include <linux/random.h>
130 #include <trace/events/napi.h>
131 #include <trace/events/net.h>
132 #include <trace/events/skb.h>
133 #include <linux/pci.h>
134 #include <linux/inetdevice.h>
135 #include <linux/cpu_rmap.h>
136 #include <linux/if_tunnel.h>
137 #include <linux/if_pppox.h>
138 #include <linux/ppp_defs.h>
139 #include <linux/net_tstamp.h>
141 #include "net-sysfs.h"
143 /* Instead of increasing this, you should create a hash table. */
144 #define MAX_GRO_SKBS 8
146 /* This should be increased if a protocol with a bigger head is added. */
147 #define GRO_MAX_HEAD (MAX_HEADER + 128)
150 * The list of packet types we will receive (as opposed to discard)
151 * and the routines to invoke.
153 * Why 16. Because with 16 the only overlap we get on a hash of the
154 * low nibble of the protocol value is RARP/SNAP/X.25.
156 * NOTE: That is no longer true with the addition of VLAN tags. Not
157 * sure which should go first, but I bet it won't make much
158 * difference if we are running VLANs. The good news is that
159 * this protocol won't be in the list unless compiled in, so
160 * the average user (w/out VLANs) will not be adversely affected.
177 #define PTYPE_HASH_SIZE (16)
178 #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1)
180 static DEFINE_SPINLOCK(ptype_lock);
181 static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
182 static struct list_head ptype_all __read_mostly; /* Taps */
185 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
188 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
190 * Writers must hold the rtnl semaphore while they loop through the
191 * dev_base_head list, and hold dev_base_lock for writing when they do the
192 * actual updates. This allows pure readers to access the list even
193 * while a writer is preparing to update it.
195 * To put it another way, dev_base_lock is held for writing only to
196 * protect against pure readers; the rtnl semaphore provides the
197 * protection against other writers.
199 * See, for example usages, register_netdevice() and
200 * unregister_netdevice(), which must be called with the rtnl
203 DEFINE_RWLOCK(dev_base_lock);
204 EXPORT_SYMBOL(dev_base_lock);
206 static inline void dev_base_seq_inc(struct net *net)
208 while (++net->dev_base_seq == 0);
211 static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
213 unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
214 return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)];
217 static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
219 return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)];
222 static inline void rps_lock(struct softnet_data *sd)
225 spin_lock(&sd->input_pkt_queue.lock);
229 static inline void rps_unlock(struct softnet_data *sd)
232 spin_unlock(&sd->input_pkt_queue.lock);
236 /* Device list insertion */
237 static int list_netdevice(struct net_device *dev)
239 struct net *net = dev_net(dev);
243 write_lock_bh(&dev_base_lock);
244 list_add_tail_rcu(&dev->dev_list, &net->dev_base_head);
245 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
246 hlist_add_head_rcu(&dev->index_hlist,
247 dev_index_hash(net, dev->ifindex));
248 write_unlock_bh(&dev_base_lock);
250 dev_base_seq_inc(net);
255 /* Device list removal
256 * caller must respect a RCU grace period before freeing/reusing dev
258 static void unlist_netdevice(struct net_device *dev)
262 /* Unlink dev from the device chain */
263 write_lock_bh(&dev_base_lock);
264 list_del_rcu(&dev->dev_list);
265 hlist_del_rcu(&dev->name_hlist);
266 hlist_del_rcu(&dev->index_hlist);
267 write_unlock_bh(&dev_base_lock);
269 dev_base_seq_inc(dev_net(dev));
276 static RAW_NOTIFIER_HEAD(netdev_chain);
279 * Device drivers call our routines to queue packets here. We empty the
280 * queue in the local softnet handler.
283 DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
284 EXPORT_PER_CPU_SYMBOL(softnet_data);
286 #ifdef CONFIG_LOCKDEP
288 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
289 * according to dev->type
291 static const unsigned short netdev_lock_type[] =
292 {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
293 ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
294 ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
295 ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
296 ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
297 ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
298 ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
299 ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
300 ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
301 ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
302 ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
303 ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
304 ARPHRD_FCFABRIC, ARPHRD_IEEE802_TR, ARPHRD_IEEE80211,
305 ARPHRD_IEEE80211_PRISM, ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET,
306 ARPHRD_PHONET_PIPE, ARPHRD_IEEE802154,
307 ARPHRD_VOID, ARPHRD_NONE};
309 static const char *const netdev_lock_name[] =
310 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
311 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
312 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
313 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
314 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
315 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
316 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
317 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
318 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
319 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
320 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
321 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
322 "_xmit_FCFABRIC", "_xmit_IEEE802_TR", "_xmit_IEEE80211",
323 "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET",
324 "_xmit_PHONET_PIPE", "_xmit_IEEE802154",
325 "_xmit_VOID", "_xmit_NONE"};
327 static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
328 static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)];
330 static inline unsigned short netdev_lock_pos(unsigned short dev_type)
334 for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++)
335 if (netdev_lock_type[i] == dev_type)
337 /* the last key is used by default */
338 return ARRAY_SIZE(netdev_lock_type) - 1;
341 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
342 unsigned short dev_type)
346 i = netdev_lock_pos(dev_type);
347 lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
348 netdev_lock_name[i]);
351 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
355 i = netdev_lock_pos(dev->type);
356 lockdep_set_class_and_name(&dev->addr_list_lock,
357 &netdev_addr_lock_key[i],
358 netdev_lock_name[i]);
361 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
362 unsigned short dev_type)
365 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
370 /*******************************************************************************
372 Protocol management and registration routines
374 *******************************************************************************/
377 * Add a protocol ID to the list. Now that the input handler is
378 * smarter we can dispense with all the messy stuff that used to be
381 * BEWARE!!! Protocol handlers, mangling input packets,
382 * MUST BE last in hash buckets and checking protocol handlers
383 * MUST start from promiscuous ptype_all chain in net_bh.
384 * It is true now, do not change it.
385 * Explanation follows: if protocol handler, mangling packet, will
386 * be the first on list, it is not able to sense, that packet
387 * is cloned and should be copied-on-write, so that it will
388 * change it and subsequent readers will get broken packet.
392 static inline struct list_head *ptype_head(const struct packet_type *pt)
394 if (pt->type == htons(ETH_P_ALL))
397 return &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
401 * dev_add_pack - add packet handler
402 * @pt: packet type declaration
404 * Add a protocol handler to the networking stack. The passed &packet_type
405 * is linked into kernel lists and may not be freed until it has been
406 * removed from the kernel lists.
408 * This call does not sleep therefore it can not
409 * guarantee all CPU's that are in middle of receiving packets
410 * will see the new packet type (until the next received packet).
413 void dev_add_pack(struct packet_type *pt)
415 struct list_head *head = ptype_head(pt);
417 spin_lock(&ptype_lock);
418 list_add_rcu(&pt->list, head);
419 spin_unlock(&ptype_lock);
421 EXPORT_SYMBOL(dev_add_pack);
424 * __dev_remove_pack - remove packet handler
425 * @pt: packet type declaration
427 * Remove a protocol handler that was previously added to the kernel
428 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
429 * from the kernel lists and can be freed or reused once this function
432 * The packet type might still be in use by receivers
433 * and must not be freed until after all the CPU's have gone
434 * through a quiescent state.
436 void __dev_remove_pack(struct packet_type *pt)
438 struct list_head *head = ptype_head(pt);
439 struct packet_type *pt1;
441 spin_lock(&ptype_lock);
443 list_for_each_entry(pt1, head, list) {
445 list_del_rcu(&pt->list);
450 printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt);
452 spin_unlock(&ptype_lock);
454 EXPORT_SYMBOL(__dev_remove_pack);
457 * dev_remove_pack - remove packet handler
458 * @pt: packet type declaration
460 * Remove a protocol handler that was previously added to the kernel
461 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
462 * from the kernel lists and can be freed or reused once this function
465 * This call sleeps to guarantee that no CPU is looking at the packet
468 void dev_remove_pack(struct packet_type *pt)
470 __dev_remove_pack(pt);
474 EXPORT_SYMBOL(dev_remove_pack);
476 /******************************************************************************
478 Device Boot-time Settings Routines
480 *******************************************************************************/
482 /* Boot time configuration table */
483 static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
486 * netdev_boot_setup_add - add new setup entry
487 * @name: name of the device
488 * @map: configured settings for the device
490 * Adds new setup entry to the dev_boot_setup list. The function
491 * returns 0 on error and 1 on success. This is a generic routine to
494 static int netdev_boot_setup_add(char *name, struct ifmap *map)
496 struct netdev_boot_setup *s;
500 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
501 if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
502 memset(s[i].name, 0, sizeof(s[i].name));
503 strlcpy(s[i].name, name, IFNAMSIZ);
504 memcpy(&s[i].map, map, sizeof(s[i].map));
509 return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
513 * netdev_boot_setup_check - check boot time settings
514 * @dev: the netdevice
516 * Check boot time settings for the device.
517 * The found settings are set for the device to be used
518 * later in the device probing.
519 * Returns 0 if no settings found, 1 if they are.
521 int netdev_boot_setup_check(struct net_device *dev)
523 struct netdev_boot_setup *s = dev_boot_setup;
526 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
527 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
528 !strcmp(dev->name, s[i].name)) {
529 dev->irq = s[i].map.irq;
530 dev->base_addr = s[i].map.base_addr;
531 dev->mem_start = s[i].map.mem_start;
532 dev->mem_end = s[i].map.mem_end;
538 EXPORT_SYMBOL(netdev_boot_setup_check);
542 * netdev_boot_base - get address from boot time settings
543 * @prefix: prefix for network device
544 * @unit: id for network device
546 * Check boot time settings for the base address of device.
547 * The found settings are set for the device to be used
548 * later in the device probing.
549 * Returns 0 if no settings found.
551 unsigned long netdev_boot_base(const char *prefix, int unit)
553 const struct netdev_boot_setup *s = dev_boot_setup;
557 sprintf(name, "%s%d", prefix, unit);
560 * If device already registered then return base of 1
561 * to indicate not to probe for this interface
563 if (__dev_get_by_name(&init_net, name))
566 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
567 if (!strcmp(name, s[i].name))
568 return s[i].map.base_addr;
573 * Saves at boot time configured settings for any netdevice.
575 int __init netdev_boot_setup(char *str)
580 str = get_options(str, ARRAY_SIZE(ints), ints);
585 memset(&map, 0, sizeof(map));
589 map.base_addr = ints[2];
591 map.mem_start = ints[3];
593 map.mem_end = ints[4];
595 /* Add new entry to the list */
596 return netdev_boot_setup_add(str, &map);
599 __setup("netdev=", netdev_boot_setup);
601 /*******************************************************************************
603 Device Interface Subroutines
605 *******************************************************************************/
608 * __dev_get_by_name - find a device by its name
609 * @net: the applicable net namespace
610 * @name: name to find
612 * Find an interface by name. Must be called under RTNL semaphore
613 * or @dev_base_lock. If the name is found a pointer to the device
614 * is returned. If the name is not found then %NULL is returned. The
615 * reference counters are not incremented so the caller must be
616 * careful with locks.
619 struct net_device *__dev_get_by_name(struct net *net, const char *name)
621 struct hlist_node *p;
622 struct net_device *dev;
623 struct hlist_head *head = dev_name_hash(net, name);
625 hlist_for_each_entry(dev, p, head, name_hlist)
626 if (!strncmp(dev->name, name, IFNAMSIZ))
631 EXPORT_SYMBOL(__dev_get_by_name);
634 * dev_get_by_name_rcu - find a device by its name
635 * @net: the applicable net namespace
636 * @name: name to find
638 * Find an interface by name.
639 * If the name is found a pointer to the device is returned.
640 * If the name is not found then %NULL is returned.
641 * The reference counters are not incremented so the caller must be
642 * careful with locks. The caller must hold RCU lock.
645 struct net_device *dev_get_by_name_rcu(struct net *net, const char *name)
647 struct hlist_node *p;
648 struct net_device *dev;
649 struct hlist_head *head = dev_name_hash(net, name);
651 hlist_for_each_entry_rcu(dev, p, head, name_hlist)
652 if (!strncmp(dev->name, name, IFNAMSIZ))
657 EXPORT_SYMBOL(dev_get_by_name_rcu);
660 * dev_get_by_name - find a device by its name
661 * @net: the applicable net namespace
662 * @name: name to find
664 * Find an interface by name. This can be called from any
665 * context and does its own locking. The returned handle has
666 * the usage count incremented and the caller must use dev_put() to
667 * release it when it is no longer needed. %NULL is returned if no
668 * matching device is found.
671 struct net_device *dev_get_by_name(struct net *net, const char *name)
673 struct net_device *dev;
676 dev = dev_get_by_name_rcu(net, name);
682 EXPORT_SYMBOL(dev_get_by_name);
685 * __dev_get_by_index - find a device by its ifindex
686 * @net: the applicable net namespace
687 * @ifindex: index of device
689 * Search for an interface by index. Returns %NULL if the device
690 * is not found or a pointer to the device. The device has not
691 * had its reference counter increased so the caller must be careful
692 * about locking. The caller must hold either the RTNL semaphore
696 struct net_device *__dev_get_by_index(struct net *net, int ifindex)
698 struct hlist_node *p;
699 struct net_device *dev;
700 struct hlist_head *head = dev_index_hash(net, ifindex);
702 hlist_for_each_entry(dev, p, head, index_hlist)
703 if (dev->ifindex == ifindex)
708 EXPORT_SYMBOL(__dev_get_by_index);
711 * dev_get_by_index_rcu - find a device by its ifindex
712 * @net: the applicable net namespace
713 * @ifindex: index of device
715 * Search for an interface by index. Returns %NULL if the device
716 * is not found or a pointer to the device. The device has not
717 * had its reference counter increased so the caller must be careful
718 * about locking. The caller must hold RCU lock.
721 struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex)
723 struct hlist_node *p;
724 struct net_device *dev;
725 struct hlist_head *head = dev_index_hash(net, ifindex);
727 hlist_for_each_entry_rcu(dev, p, head, index_hlist)
728 if (dev->ifindex == ifindex)
733 EXPORT_SYMBOL(dev_get_by_index_rcu);
737 * dev_get_by_index - find a device by its ifindex
738 * @net: the applicable net namespace
739 * @ifindex: index of device
741 * Search for an interface by index. Returns NULL if the device
742 * is not found or a pointer to the device. The device returned has
743 * had a reference added and the pointer is safe until the user calls
744 * dev_put to indicate they have finished with it.
747 struct net_device *dev_get_by_index(struct net *net, int ifindex)
749 struct net_device *dev;
752 dev = dev_get_by_index_rcu(net, ifindex);
758 EXPORT_SYMBOL(dev_get_by_index);
761 * dev_getbyhwaddr_rcu - find a device by its hardware address
762 * @net: the applicable net namespace
763 * @type: media type of device
764 * @ha: hardware address
766 * Search for an interface by MAC address. Returns NULL if the device
767 * is not found or a pointer to the device.
768 * The caller must hold RCU or RTNL.
769 * The returned device has not had its ref count increased
770 * and the caller must therefore be careful about locking
774 struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
777 struct net_device *dev;
779 for_each_netdev_rcu(net, dev)
780 if (dev->type == type &&
781 !memcmp(dev->dev_addr, ha, dev->addr_len))
786 EXPORT_SYMBOL(dev_getbyhwaddr_rcu);
788 struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
790 struct net_device *dev;
793 for_each_netdev(net, dev)
794 if (dev->type == type)
799 EXPORT_SYMBOL(__dev_getfirstbyhwtype);
801 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
803 struct net_device *dev, *ret = NULL;
806 for_each_netdev_rcu(net, dev)
807 if (dev->type == type) {
815 EXPORT_SYMBOL(dev_getfirstbyhwtype);
818 * dev_get_by_flags_rcu - find any device with given flags
819 * @net: the applicable net namespace
820 * @if_flags: IFF_* values
821 * @mask: bitmask of bits in if_flags to check
823 * Search for any interface with the given flags. Returns NULL if a device
824 * is not found or a pointer to the device. Must be called inside
825 * rcu_read_lock(), and result refcount is unchanged.
828 struct net_device *dev_get_by_flags_rcu(struct net *net, unsigned short if_flags,
831 struct net_device *dev, *ret;
834 for_each_netdev_rcu(net, dev) {
835 if (((dev->flags ^ if_flags) & mask) == 0) {
842 EXPORT_SYMBOL(dev_get_by_flags_rcu);
845 * dev_valid_name - check if name is okay for network device
848 * Network device names need to be valid file names to
849 * to allow sysfs to work. We also disallow any kind of
852 int dev_valid_name(const char *name)
856 if (strlen(name) >= IFNAMSIZ)
858 if (!strcmp(name, ".") || !strcmp(name, ".."))
862 if (*name == '/' || isspace(*name))
868 EXPORT_SYMBOL(dev_valid_name);
871 * __dev_alloc_name - allocate a name for a device
872 * @net: network namespace to allocate the device name in
873 * @name: name format string
874 * @buf: scratch buffer and result name string
876 * Passed a format string - eg "lt%d" it will try and find a suitable
877 * id. It scans list of devices to build up a free map, then chooses
878 * the first empty slot. The caller must hold the dev_base or rtnl lock
879 * while allocating the name and adding the device in order to avoid
881 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
882 * Returns the number of the unit assigned or a negative errno code.
885 static int __dev_alloc_name(struct net *net, const char *name, char *buf)
889 const int max_netdevices = 8*PAGE_SIZE;
890 unsigned long *inuse;
891 struct net_device *d;
893 p = strnchr(name, IFNAMSIZ-1, '%');
896 * Verify the string as this thing may have come from
897 * the user. There must be either one "%d" and no other "%"
900 if (p[1] != 'd' || strchr(p + 2, '%'))
903 /* Use one page as a bit array of possible slots */
904 inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
908 for_each_netdev(net, d) {
909 if (!sscanf(d->name, name, &i))
911 if (i < 0 || i >= max_netdevices)
914 /* avoid cases where sscanf is not exact inverse of printf */
915 snprintf(buf, IFNAMSIZ, name, i);
916 if (!strncmp(buf, d->name, IFNAMSIZ))
920 i = find_first_zero_bit(inuse, max_netdevices);
921 free_page((unsigned long) inuse);
925 snprintf(buf, IFNAMSIZ, name, i);
926 if (!__dev_get_by_name(net, buf))
929 /* It is possible to run out of possible slots
930 * when the name is long and there isn't enough space left
931 * for the digits, or if all bits are used.
937 * dev_alloc_name - allocate a name for a device
939 * @name: name format string
941 * Passed a format string - eg "lt%d" it will try and find a suitable
942 * id. It scans list of devices to build up a free map, then chooses
943 * the first empty slot. The caller must hold the dev_base or rtnl lock
944 * while allocating the name and adding the device in order to avoid
946 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
947 * Returns the number of the unit assigned or a negative errno code.
950 int dev_alloc_name(struct net_device *dev, const char *name)
956 BUG_ON(!dev_net(dev));
958 ret = __dev_alloc_name(net, name, buf);
960 strlcpy(dev->name, buf, IFNAMSIZ);
963 EXPORT_SYMBOL(dev_alloc_name);
965 static int dev_get_valid_name(struct net_device *dev, const char *name)
969 BUG_ON(!dev_net(dev));
972 if (!dev_valid_name(name))
975 if (strchr(name, '%'))
976 return dev_alloc_name(dev, name);
977 else if (__dev_get_by_name(net, name))
979 else if (dev->name != name)
980 strlcpy(dev->name, name, IFNAMSIZ);
986 * dev_change_name - change name of a device
988 * @newname: name (or format string) must be at least IFNAMSIZ
990 * Change name of a device, can pass format strings "eth%d".
993 int dev_change_name(struct net_device *dev, const char *newname)
995 char oldname[IFNAMSIZ];
1001 BUG_ON(!dev_net(dev));
1004 if (dev->flags & IFF_UP)
1007 if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
1010 memcpy(oldname, dev->name, IFNAMSIZ);
1012 err = dev_get_valid_name(dev, newname);
1017 ret = device_rename(&dev->dev, dev->name);
1019 memcpy(dev->name, oldname, IFNAMSIZ);
1023 write_lock_bh(&dev_base_lock);
1024 hlist_del_rcu(&dev->name_hlist);
1025 write_unlock_bh(&dev_base_lock);
1029 write_lock_bh(&dev_base_lock);
1030 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
1031 write_unlock_bh(&dev_base_lock);
1033 ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
1034 ret = notifier_to_errno(ret);
1037 /* err >= 0 after dev_alloc_name() or stores the first errno */
1040 memcpy(dev->name, oldname, IFNAMSIZ);
1044 "%s: name change rollback failed: %d.\n",
1053 * dev_set_alias - change ifalias of a device
1055 * @alias: name up to IFALIASZ
1056 * @len: limit of bytes to copy from info
1058 * Set ifalias for a device,
1060 int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
1066 if (len >= IFALIASZ)
1071 kfree(dev->ifalias);
1072 dev->ifalias = NULL;
1077 new_ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL);
1080 dev->ifalias = new_ifalias;
1082 strlcpy(dev->ifalias, alias, len+1);
1088 * netdev_features_change - device changes features
1089 * @dev: device to cause notification
1091 * Called to indicate a device has changed features.
1093 void netdev_features_change(struct net_device *dev)
1095 call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
1097 EXPORT_SYMBOL(netdev_features_change);
1100 * netdev_state_change - device changes state
1101 * @dev: device to cause notification
1103 * Called to indicate a device has changed state. This function calls
1104 * the notifier chains for netdev_chain and sends a NEWLINK message
1105 * to the routing socket.
1107 void netdev_state_change(struct net_device *dev)
1109 if (dev->flags & IFF_UP) {
1110 call_netdevice_notifiers(NETDEV_CHANGE, dev);
1111 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1114 EXPORT_SYMBOL(netdev_state_change);
1116 int netdev_bonding_change(struct net_device *dev, unsigned long event)
1118 return call_netdevice_notifiers(event, dev);
1120 EXPORT_SYMBOL(netdev_bonding_change);
1123 * dev_load - load a network module
1124 * @net: the applicable net namespace
1125 * @name: name of interface
1127 * If a network interface is not present and the process has suitable
1128 * privileges this function loads the module. If module loading is not
1129 * available in this kernel then it becomes a nop.
1132 void dev_load(struct net *net, const char *name)
1134 struct net_device *dev;
1138 dev = dev_get_by_name_rcu(net, name);
1142 if (no_module && capable(CAP_NET_ADMIN))
1143 no_module = request_module("netdev-%s", name);
1144 if (no_module && capable(CAP_SYS_MODULE)) {
1145 if (!request_module("%s", name))
1146 pr_err("Loading kernel module for a network device "
1147 "with CAP_SYS_MODULE (deprecated). Use CAP_NET_ADMIN and alias netdev-%s "
1151 EXPORT_SYMBOL(dev_load);
1153 static int __dev_open(struct net_device *dev)
1155 const struct net_device_ops *ops = dev->netdev_ops;
1160 if (!netif_device_present(dev))
1163 ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev);
1164 ret = notifier_to_errno(ret);
1168 set_bit(__LINK_STATE_START, &dev->state);
1170 if (ops->ndo_validate_addr)
1171 ret = ops->ndo_validate_addr(dev);
1173 if (!ret && ops->ndo_open)
1174 ret = ops->ndo_open(dev);
1177 clear_bit(__LINK_STATE_START, &dev->state);
1179 dev->flags |= IFF_UP;
1180 net_dmaengine_get();
1181 dev_set_rx_mode(dev);
1183 add_device_randomness(dev->dev_addr, dev->addr_len);
1190 * dev_open - prepare an interface for use.
1191 * @dev: device to open
1193 * Takes a device from down to up state. The device's private open
1194 * function is invoked and then the multicast lists are loaded. Finally
1195 * the device is moved into the up state and a %NETDEV_UP message is
1196 * sent to the netdev notifier chain.
1198 * Calling this function on an active interface is a nop. On a failure
1199 * a negative errno code is returned.
1201 int dev_open(struct net_device *dev)
1205 if (dev->flags & IFF_UP)
1208 ret = __dev_open(dev);
1212 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1213 call_netdevice_notifiers(NETDEV_UP, dev);
1217 EXPORT_SYMBOL(dev_open);
1219 static int __dev_close_many(struct list_head *head)
1221 struct net_device *dev;
1226 list_for_each_entry(dev, head, unreg_list) {
1227 call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
1229 clear_bit(__LINK_STATE_START, &dev->state);
1231 /* Synchronize to scheduled poll. We cannot touch poll list, it
1232 * can be even on different cpu. So just clear netif_running().
1234 * dev->stop() will invoke napi_disable() on all of it's
1235 * napi_struct instances on this device.
1237 smp_mb__after_clear_bit(); /* Commit netif_running(). */
1240 dev_deactivate_many(head);
1242 list_for_each_entry(dev, head, unreg_list) {
1243 const struct net_device_ops *ops = dev->netdev_ops;
1246 * Call the device specific close. This cannot fail.
1247 * Only if device is UP
1249 * We allow it to be called even after a DETACH hot-plug
1255 dev->flags &= ~IFF_UP;
1256 net_dmaengine_put();
1262 static int __dev_close(struct net_device *dev)
1267 list_add(&dev->unreg_list, &single);
1268 retval = __dev_close_many(&single);
1273 static int dev_close_many(struct list_head *head)
1275 struct net_device *dev, *tmp;
1276 LIST_HEAD(tmp_list);
1278 list_for_each_entry_safe(dev, tmp, head, unreg_list)
1279 if (!(dev->flags & IFF_UP))
1280 list_move(&dev->unreg_list, &tmp_list);
1282 __dev_close_many(head);
1284 list_for_each_entry(dev, head, unreg_list) {
1285 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1286 call_netdevice_notifiers(NETDEV_DOWN, dev);
1289 /* rollback_registered_many needs the complete original list */
1290 list_splice(&tmp_list, head);
1295 * dev_close - shutdown an interface.
1296 * @dev: device to shutdown
1298 * This function moves an active device into down state. A
1299 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1300 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1303 int dev_close(struct net_device *dev)
1305 if (dev->flags & IFF_UP) {
1308 list_add(&dev->unreg_list, &single);
1309 dev_close_many(&single);
1314 EXPORT_SYMBOL(dev_close);
1318 * dev_disable_lro - disable Large Receive Offload on a device
1321 * Disable Large Receive Offload (LRO) on a net device. Must be
1322 * called under RTNL. This is needed if received packets may be
1323 * forwarded to another interface.
1325 void dev_disable_lro(struct net_device *dev)
1330 * If we're trying to disable lro on a vlan device
1331 * use the underlying physical device instead
1333 if (is_vlan_dev(dev))
1334 dev = vlan_dev_real_dev(dev);
1336 if (dev->ethtool_ops && dev->ethtool_ops->get_flags)
1337 flags = dev->ethtool_ops->get_flags(dev);
1339 flags = ethtool_op_get_flags(dev);
1341 if (!(flags & ETH_FLAG_LRO))
1344 __ethtool_set_flags(dev, flags & ~ETH_FLAG_LRO);
1345 if (unlikely(dev->features & NETIF_F_LRO))
1346 netdev_WARN(dev, "failed to disable LRO!\n");
1348 EXPORT_SYMBOL(dev_disable_lro);
1351 static int dev_boot_phase = 1;
1354 * register_netdevice_notifier - register a network notifier block
1357 * Register a notifier to be called when network device events occur.
1358 * The notifier passed is linked into the kernel structures and must
1359 * not be reused until it has been unregistered. A negative errno code
1360 * is returned on a failure.
1362 * When registered all registration and up events are replayed
1363 * to the new notifier to allow device to have a race free
1364 * view of the network device list.
1367 int register_netdevice_notifier(struct notifier_block *nb)
1369 struct net_device *dev;
1370 struct net_device *last;
1375 err = raw_notifier_chain_register(&netdev_chain, nb);
1381 for_each_netdev(net, dev) {
1382 err = nb->notifier_call(nb, NETDEV_REGISTER, dev);
1383 err = notifier_to_errno(err);
1387 if (!(dev->flags & IFF_UP))
1390 nb->notifier_call(nb, NETDEV_UP, dev);
1401 for_each_netdev(net, dev) {
1405 if (dev->flags & IFF_UP) {
1406 nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
1407 nb->notifier_call(nb, NETDEV_DOWN, dev);
1409 nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
1410 nb->notifier_call(nb, NETDEV_UNREGISTER_BATCH, dev);
1415 raw_notifier_chain_unregister(&netdev_chain, nb);
1418 EXPORT_SYMBOL(register_netdevice_notifier);
1421 * unregister_netdevice_notifier - unregister a network notifier block
1424 * Unregister a notifier previously registered by
1425 * register_netdevice_notifier(). The notifier is unlinked into the
1426 * kernel structures and may then be reused. A negative errno code
1427 * is returned on a failure.
1429 * After unregistering unregister and down device events are synthesized
1430 * for all devices on the device list to the removed notifier to remove
1431 * the need for special case cleanup code.
1434 int unregister_netdevice_notifier(struct notifier_block *nb)
1436 struct net_device *dev;
1441 err = raw_notifier_chain_unregister(&netdev_chain, nb);
1446 for_each_netdev(net, dev) {
1447 if (dev->flags & IFF_UP) {
1448 nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
1449 nb->notifier_call(nb, NETDEV_DOWN, dev);
1451 nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
1452 nb->notifier_call(nb, NETDEV_UNREGISTER_BATCH, dev);
1459 EXPORT_SYMBOL(unregister_netdevice_notifier);
1462 * call_netdevice_notifiers - call all network notifier blocks
1463 * @val: value passed unmodified to notifier function
1464 * @dev: net_device pointer passed unmodified to notifier function
1466 * Call all network notifier blocks. Parameters and return value
1467 * are as for raw_notifier_call_chain().
1470 int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
1473 return raw_notifier_call_chain(&netdev_chain, val, dev);
1475 EXPORT_SYMBOL(call_netdevice_notifiers);
1477 /* When > 0 there are consumers of rx skb time stamps */
1478 static atomic_t netstamp_needed = ATOMIC_INIT(0);
1480 void net_enable_timestamp(void)
1482 atomic_inc(&netstamp_needed);
1484 EXPORT_SYMBOL(net_enable_timestamp);
1486 void net_disable_timestamp(void)
1488 atomic_dec(&netstamp_needed);
1490 EXPORT_SYMBOL(net_disable_timestamp);
1492 static inline void net_timestamp_set(struct sk_buff *skb)
1494 if (atomic_read(&netstamp_needed))
1495 __net_timestamp(skb);
1497 skb->tstamp.tv64 = 0;
1500 static inline void net_timestamp_check(struct sk_buff *skb)
1502 if (!skb->tstamp.tv64 && atomic_read(&netstamp_needed))
1503 __net_timestamp(skb);
1506 static int net_hwtstamp_validate(struct ifreq *ifr)
1508 struct hwtstamp_config cfg;
1509 enum hwtstamp_tx_types tx_type;
1510 enum hwtstamp_rx_filters rx_filter;
1511 int tx_type_valid = 0;
1512 int rx_filter_valid = 0;
1514 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
1517 if (cfg.flags) /* reserved for future extensions */
1520 tx_type = cfg.tx_type;
1521 rx_filter = cfg.rx_filter;
1524 case HWTSTAMP_TX_OFF:
1525 case HWTSTAMP_TX_ON:
1526 case HWTSTAMP_TX_ONESTEP_SYNC:
1531 switch (rx_filter) {
1532 case HWTSTAMP_FILTER_NONE:
1533 case HWTSTAMP_FILTER_ALL:
1534 case HWTSTAMP_FILTER_SOME:
1535 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
1536 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
1537 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
1538 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
1539 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
1540 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
1541 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
1542 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
1543 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
1544 case HWTSTAMP_FILTER_PTP_V2_EVENT:
1545 case HWTSTAMP_FILTER_PTP_V2_SYNC:
1546 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
1547 rx_filter_valid = 1;
1551 if (!tx_type_valid || !rx_filter_valid)
1557 static inline bool is_skb_forwardable(struct net_device *dev,
1558 struct sk_buff *skb)
1562 if (!(dev->flags & IFF_UP))
1565 len = dev->mtu + dev->hard_header_len + VLAN_HLEN;
1566 if (skb->len <= len)
1569 /* if TSO is enabled, we don't care about the length as the packet
1570 * could be forwarded without being segmented before
1572 if (skb_is_gso(skb))
1579 * dev_forward_skb - loopback an skb to another netif
1581 * @dev: destination network device
1582 * @skb: buffer to forward
1585 * NET_RX_SUCCESS (no congestion)
1586 * NET_RX_DROP (packet was dropped, but freed)
1588 * dev_forward_skb can be used for injecting an skb from the
1589 * start_xmit function of one device into the receive queue
1590 * of another device.
1592 * The receiving device may be in another namespace, so
1593 * we have to clear all information in the skb that could
1594 * impact namespace isolation.
1596 int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
1598 if (skb_shinfo(skb)->tx_flags & SKBTX_DEV_ZEROCOPY) {
1599 if (skb_copy_ubufs(skb, GFP_ATOMIC)) {
1600 atomic_long_inc(&dev->rx_dropped);
1609 if (unlikely(!is_skb_forwardable(dev, skb))) {
1610 atomic_long_inc(&dev->rx_dropped);
1616 skb->tstamp.tv64 = 0;
1617 skb->pkt_type = PACKET_HOST;
1618 skb->protocol = eth_type_trans(skb, dev);
1622 return netif_rx(skb);
1624 EXPORT_SYMBOL_GPL(dev_forward_skb);
1626 static inline int deliver_skb(struct sk_buff *skb,
1627 struct packet_type *pt_prev,
1628 struct net_device *orig_dev)
1630 atomic_inc(&skb->users);
1631 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
1634 static inline bool skb_loop_sk(struct packet_type *ptype, struct sk_buff *skb)
1636 if (ptype->af_packet_priv == NULL)
1639 if (ptype->id_match)
1640 return ptype->id_match(ptype, skb->sk);
1641 else if ((struct sock *)ptype->af_packet_priv == skb->sk)
1648 * Support routine. Sends outgoing frames to any network
1649 * taps currently in use.
1652 static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1654 struct packet_type *ptype;
1655 struct sk_buff *skb2 = NULL;
1656 struct packet_type *pt_prev = NULL;
1659 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1660 /* Never send packets back to the socket
1661 * they originated from - MvS (miquels@drinkel.ow.org)
1663 if ((ptype->dev == dev || !ptype->dev) &&
1664 (!skb_loop_sk(ptype, skb))) {
1666 deliver_skb(skb2, pt_prev, skb->dev);
1671 skb2 = skb_clone(skb, GFP_ATOMIC);
1675 net_timestamp_set(skb2);
1677 /* skb->nh should be correctly
1678 set by sender, so that the second statement is
1679 just protection against buggy protocols.
1681 skb_reset_mac_header(skb2);
1683 if (skb_network_header(skb2) < skb2->data ||
1684 skb2->network_header > skb2->tail) {
1685 if (net_ratelimit())
1686 printk(KERN_CRIT "protocol %04x is "
1688 ntohs(skb2->protocol),
1690 skb_reset_network_header(skb2);
1693 skb2->transport_header = skb2->network_header;
1694 skb2->pkt_type = PACKET_OUTGOING;
1699 pt_prev->func(skb2, skb->dev, pt_prev, skb->dev);
1703 /* netif_setup_tc - Handle tc mappings on real_num_tx_queues change
1704 * @dev: Network device
1705 * @txq: number of queues available
1707 * If real_num_tx_queues is changed the tc mappings may no longer be
1708 * valid. To resolve this verify the tc mapping remains valid and if
1709 * not NULL the mapping. With no priorities mapping to this
1710 * offset/count pair it will no longer be used. In the worst case TC0
1711 * is invalid nothing can be done so disable priority mappings. If is
1712 * expected that drivers will fix this mapping if they can before
1713 * calling netif_set_real_num_tx_queues.
1715 static void netif_setup_tc(struct net_device *dev, unsigned int txq)
1718 struct netdev_tc_txq *tc = &dev->tc_to_txq[0];
1720 /* If TC0 is invalidated disable TC mapping */
1721 if (tc->offset + tc->count > txq) {
1722 pr_warning("Number of in use tx queues changed "
1723 "invalidating tc mappings. Priority "
1724 "traffic classification disabled!\n");
1729 /* Invalidated prio to tc mappings set to TC0 */
1730 for (i = 1; i < TC_BITMASK + 1; i++) {
1731 int q = netdev_get_prio_tc_map(dev, i);
1733 tc = &dev->tc_to_txq[q];
1734 if (tc->offset + tc->count > txq) {
1735 pr_warning("Number of in use tx queues "
1736 "changed. Priority %i to tc "
1737 "mapping %i is no longer valid "
1738 "setting map to 0\n",
1740 netdev_set_prio_tc_map(dev, i, 0);
1746 * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
1747 * greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
1749 int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq)
1753 if (txq < 1 || txq > dev->num_tx_queues)
1756 if (dev->reg_state == NETREG_REGISTERED ||
1757 dev->reg_state == NETREG_UNREGISTERING) {
1760 rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues,
1766 netif_setup_tc(dev, txq);
1768 if (txq < dev->real_num_tx_queues)
1769 qdisc_reset_all_tx_gt(dev, txq);
1772 dev->real_num_tx_queues = txq;
1775 EXPORT_SYMBOL(netif_set_real_num_tx_queues);
1779 * netif_set_real_num_rx_queues - set actual number of RX queues used
1780 * @dev: Network device
1781 * @rxq: Actual number of RX queues
1783 * This must be called either with the rtnl_lock held or before
1784 * registration of the net device. Returns 0 on success, or a
1785 * negative error code. If called before registration, it always
1788 int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq)
1792 if (rxq < 1 || rxq > dev->num_rx_queues)
1795 if (dev->reg_state == NETREG_REGISTERED) {
1798 rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues,
1804 dev->real_num_rx_queues = rxq;
1807 EXPORT_SYMBOL(netif_set_real_num_rx_queues);
1810 static inline void __netif_reschedule(struct Qdisc *q)
1812 struct softnet_data *sd;
1813 unsigned long flags;
1815 local_irq_save(flags);
1816 sd = &__get_cpu_var(softnet_data);
1817 q->next_sched = NULL;
1818 *sd->output_queue_tailp = q;
1819 sd->output_queue_tailp = &q->next_sched;
1820 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1821 local_irq_restore(flags);
1824 void __netif_schedule(struct Qdisc *q)
1826 if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
1827 __netif_reschedule(q);
1829 EXPORT_SYMBOL(__netif_schedule);
1831 void dev_kfree_skb_irq(struct sk_buff *skb)
1833 if (atomic_dec_and_test(&skb->users)) {
1834 struct softnet_data *sd;
1835 unsigned long flags;
1837 local_irq_save(flags);
1838 sd = &__get_cpu_var(softnet_data);
1839 skb->next = sd->completion_queue;
1840 sd->completion_queue = skb;
1841 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1842 local_irq_restore(flags);
1845 EXPORT_SYMBOL(dev_kfree_skb_irq);
1847 void dev_kfree_skb_any(struct sk_buff *skb)
1849 if (in_irq() || irqs_disabled())
1850 dev_kfree_skb_irq(skb);
1854 EXPORT_SYMBOL(dev_kfree_skb_any);
1858 * netif_device_detach - mark device as removed
1859 * @dev: network device
1861 * Mark device as removed from system and therefore no longer available.
1863 void netif_device_detach(struct net_device *dev)
1865 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
1866 netif_running(dev)) {
1867 netif_tx_stop_all_queues(dev);
1870 EXPORT_SYMBOL(netif_device_detach);
1873 * netif_device_attach - mark device as attached
1874 * @dev: network device
1876 * Mark device as attached from system and restart if needed.
1878 void netif_device_attach(struct net_device *dev)
1880 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
1881 netif_running(dev)) {
1882 netif_tx_wake_all_queues(dev);
1883 __netdev_watchdog_up(dev);
1886 EXPORT_SYMBOL(netif_device_attach);
1889 * Invalidate hardware checksum when packet is to be mangled, and
1890 * complete checksum manually on outgoing path.
1892 int skb_checksum_help(struct sk_buff *skb)
1895 int ret = 0, offset;
1897 if (skb->ip_summed == CHECKSUM_COMPLETE)
1898 goto out_set_summed;
1900 if (unlikely(skb_shinfo(skb)->gso_size)) {
1901 /* Let GSO fix up the checksum. */
1902 goto out_set_summed;
1905 offset = skb_checksum_start_offset(skb);
1906 BUG_ON(offset >= skb_headlen(skb));
1907 csum = skb_checksum(skb, offset, skb->len - offset, 0);
1909 offset += skb->csum_offset;
1910 BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
1912 if (skb_cloned(skb) &&
1913 !skb_clone_writable(skb, offset + sizeof(__sum16))) {
1914 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1919 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1921 skb->ip_summed = CHECKSUM_NONE;
1925 EXPORT_SYMBOL(skb_checksum_help);
1928 * skb_gso_segment - Perform segmentation on skb.
1929 * @skb: buffer to segment
1930 * @features: features for the output path (see dev->features)
1932 * This function segments the given skb and returns a list of segments.
1934 * It may return NULL if the skb requires no segmentation. This is
1935 * only possible when GSO is used for verifying header integrity.
1937 struct sk_buff *skb_gso_segment(struct sk_buff *skb, u32 features)
1939 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
1940 struct packet_type *ptype;
1941 __be16 type = skb->protocol;
1942 int vlan_depth = ETH_HLEN;
1945 while (type == htons(ETH_P_8021Q)) {
1946 struct vlan_hdr *vh;
1948 if (unlikely(!pskb_may_pull(skb, vlan_depth + VLAN_HLEN)))
1949 return ERR_PTR(-EINVAL);
1951 vh = (struct vlan_hdr *)(skb->data + vlan_depth);
1952 type = vh->h_vlan_encapsulated_proto;
1953 vlan_depth += VLAN_HLEN;
1956 skb_reset_mac_header(skb);
1957 skb->mac_len = skb->network_header - skb->mac_header;
1958 __skb_pull(skb, skb->mac_len);
1960 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1961 struct net_device *dev = skb->dev;
1962 struct ethtool_drvinfo info = {};
1964 if (dev && dev->ethtool_ops && dev->ethtool_ops->get_drvinfo)
1965 dev->ethtool_ops->get_drvinfo(dev, &info);
1967 WARN(1, "%s: caps=(0x%lx, 0x%lx) len=%d data_len=%d ip_summed=%d\n",
1968 info.driver, dev ? dev->features : 0L,
1969 skb->sk ? skb->sk->sk_route_caps : 0L,
1970 skb->len, skb->data_len, skb->ip_summed);
1972 if (skb_header_cloned(skb) &&
1973 (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
1974 return ERR_PTR(err);
1978 list_for_each_entry_rcu(ptype,
1979 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
1980 if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1981 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1982 err = ptype->gso_send_check(skb);
1983 segs = ERR_PTR(err);
1984 if (err || skb_gso_ok(skb, features))
1986 __skb_push(skb, (skb->data -
1987 skb_network_header(skb)));
1989 segs = ptype->gso_segment(skb, features);
1995 __skb_push(skb, skb->data - skb_mac_header(skb));
1999 EXPORT_SYMBOL(skb_gso_segment);
2001 /* Take action when hardware reception checksum errors are detected. */
2003 void netdev_rx_csum_fault(struct net_device *dev)
2005 if (net_ratelimit()) {
2006 printk(KERN_ERR "%s: hw csum failure.\n",
2007 dev ? dev->name : "<unknown>");
2011 EXPORT_SYMBOL(netdev_rx_csum_fault);
2014 /* Actually, we should eliminate this check as soon as we know, that:
2015 * 1. IOMMU is present and allows to map all the memory.
2016 * 2. No high memory really exists on this machine.
2019 static int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
2021 #ifdef CONFIG_HIGHMEM
2023 if (!(dev->features & NETIF_F_HIGHDMA)) {
2024 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
2025 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
2026 if (PageHighMem(skb_frag_page(frag)))
2031 if (PCI_DMA_BUS_IS_PHYS) {
2032 struct device *pdev = dev->dev.parent;
2036 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
2037 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
2038 dma_addr_t addr = page_to_phys(skb_frag_page(frag));
2039 if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask)
2048 void (*destructor)(struct sk_buff *skb);
2051 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
2053 static void dev_gso_skb_destructor(struct sk_buff *skb)
2055 struct dev_gso_cb *cb;
2058 struct sk_buff *nskb = skb->next;
2060 skb->next = nskb->next;
2063 } while (skb->next);
2065 cb = DEV_GSO_CB(skb);
2067 cb->destructor(skb);
2071 * dev_gso_segment - Perform emulated hardware segmentation on skb.
2072 * @skb: buffer to segment
2073 * @features: device features as applicable to this skb
2075 * This function segments the given skb and stores the list of segments
2078 static int dev_gso_segment(struct sk_buff *skb, int features)
2080 struct sk_buff *segs;
2082 segs = skb_gso_segment(skb, features);
2084 /* Verifying header integrity only. */
2089 return PTR_ERR(segs);
2092 DEV_GSO_CB(skb)->destructor = skb->destructor;
2093 skb->destructor = dev_gso_skb_destructor;
2098 static bool can_checksum_protocol(unsigned long features, __be16 protocol)
2100 return ((features & NETIF_F_GEN_CSUM) ||
2101 ((features & NETIF_F_V4_CSUM) &&
2102 protocol == htons(ETH_P_IP)) ||
2103 ((features & NETIF_F_V6_CSUM) &&
2104 protocol == htons(ETH_P_IPV6)) ||
2105 ((features & NETIF_F_FCOE_CRC) &&
2106 protocol == htons(ETH_P_FCOE)));
2109 static u32 harmonize_features(struct sk_buff *skb, __be16 protocol, u32 features)
2111 if (!can_checksum_protocol(features, protocol)) {
2112 features &= ~NETIF_F_ALL_CSUM;
2113 features &= ~NETIF_F_SG;
2114 } else if (illegal_highdma(skb->dev, skb)) {
2115 features &= ~NETIF_F_SG;
2121 u32 netif_skb_features(struct sk_buff *skb)
2123 __be16 protocol = skb->protocol;
2124 u32 features = skb->dev->features;
2126 if (skb_shinfo(skb)->gso_segs > skb->dev->gso_max_segs)
2127 features &= ~NETIF_F_GSO_MASK;
2129 if (protocol == htons(ETH_P_8021Q)) {
2130 struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
2131 protocol = veh->h_vlan_encapsulated_proto;
2132 } else if (!vlan_tx_tag_present(skb)) {
2133 return harmonize_features(skb, protocol, features);
2136 features &= (skb->dev->vlan_features | NETIF_F_HW_VLAN_TX);
2138 if (protocol != htons(ETH_P_8021Q)) {
2139 return harmonize_features(skb, protocol, features);
2141 features &= NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST |
2142 NETIF_F_GEN_CSUM | NETIF_F_HW_VLAN_TX;
2143 return harmonize_features(skb, protocol, features);
2146 EXPORT_SYMBOL(netif_skb_features);
2149 * Returns true if either:
2150 * 1. skb has frag_list and the device doesn't support FRAGLIST, or
2151 * 2. skb is fragmented and the device does not support SG, or if
2152 * at least one of fragments is in highmem and device does not
2153 * support DMA from it.
2155 static inline int skb_needs_linearize(struct sk_buff *skb,
2158 return skb_is_nonlinear(skb) &&
2159 ((skb_has_frag_list(skb) &&
2160 !(features & NETIF_F_FRAGLIST)) ||
2161 (skb_shinfo(skb)->nr_frags &&
2162 !(features & NETIF_F_SG)));
2165 int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
2166 struct netdev_queue *txq)
2168 const struct net_device_ops *ops = dev->netdev_ops;
2169 int rc = NETDEV_TX_OK;
2170 unsigned int skb_len;
2172 if (likely(!skb->next)) {
2176 * If device doesn't need skb->dst, release it right now while
2177 * its hot in this cpu cache
2179 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
2182 if (!list_empty(&ptype_all))
2183 dev_queue_xmit_nit(skb, dev);
2185 features = netif_skb_features(skb);
2187 if (vlan_tx_tag_present(skb) &&
2188 !(features & NETIF_F_HW_VLAN_TX)) {
2189 skb = __vlan_put_tag(skb, vlan_tx_tag_get(skb));
2196 if (netif_needs_gso(skb, features)) {
2197 if (unlikely(dev_gso_segment(skb, features)))
2202 if (skb_needs_linearize(skb, features) &&
2203 __skb_linearize(skb))
2206 /* If packet is not checksummed and device does not
2207 * support checksumming for this protocol, complete
2208 * checksumming here.
2210 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2211 skb_set_transport_header(skb,
2212 skb_checksum_start_offset(skb));
2213 if (!(features & NETIF_F_ALL_CSUM) &&
2214 skb_checksum_help(skb))
2220 rc = ops->ndo_start_xmit(skb, dev);
2221 trace_net_dev_xmit(skb, rc, dev, skb_len);
2222 if (rc == NETDEV_TX_OK)
2223 txq_trans_update(txq);
2229 struct sk_buff *nskb = skb->next;
2231 skb->next = nskb->next;
2235 * If device doesn't need nskb->dst, release it right now while
2236 * its hot in this cpu cache
2238 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
2241 skb_len = nskb->len;
2242 rc = ops->ndo_start_xmit(nskb, dev);
2243 trace_net_dev_xmit(nskb, rc, dev, skb_len);
2244 if (unlikely(rc != NETDEV_TX_OK)) {
2245 if (rc & ~NETDEV_TX_MASK)
2246 goto out_kfree_gso_skb;
2247 nskb->next = skb->next;
2251 txq_trans_update(txq);
2252 if (unlikely(netif_tx_queue_stopped(txq) && skb->next))
2253 return NETDEV_TX_BUSY;
2254 } while (skb->next);
2257 if (likely(skb->next == NULL))
2258 skb->destructor = DEV_GSO_CB(skb)->destructor;
2265 static u32 hashrnd __read_mostly;
2268 * Returns a Tx hash based on the given packet descriptor a Tx queues' number
2269 * to be used as a distribution range.
2271 u16 __skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb,
2272 unsigned int num_tx_queues)
2276 u16 qcount = num_tx_queues;
2278 if (skb_rx_queue_recorded(skb)) {
2279 hash = skb_get_rx_queue(skb);
2280 while (unlikely(hash >= num_tx_queues))
2281 hash -= num_tx_queues;
2286 u8 tc = netdev_get_prio_tc_map(dev, skb->priority);
2287 qoffset = dev->tc_to_txq[tc].offset;
2288 qcount = dev->tc_to_txq[tc].count;
2291 if (skb->sk && skb->sk->sk_hash)
2292 hash = skb->sk->sk_hash;
2294 hash = (__force u16) skb->protocol;
2295 hash = jhash_1word(hash, hashrnd);
2297 return (u16) (((u64) hash * qcount) >> 32) + qoffset;
2299 EXPORT_SYMBOL(__skb_tx_hash);
2301 static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index)
2303 if (unlikely(queue_index >= dev->real_num_tx_queues)) {
2304 if (net_ratelimit()) {
2305 pr_warning("%s selects TX queue %d, but "
2306 "real number of TX queues is %d\n",
2307 dev->name, queue_index, dev->real_num_tx_queues);
2314 static inline int get_xps_queue(struct net_device *dev, struct sk_buff *skb)
2317 struct xps_dev_maps *dev_maps;
2318 struct xps_map *map;
2319 int queue_index = -1;
2322 dev_maps = rcu_dereference(dev->xps_maps);
2324 map = rcu_dereference(
2325 dev_maps->cpu_map[raw_smp_processor_id()]);
2328 queue_index = map->queues[0];
2331 if (skb->sk && skb->sk->sk_hash)
2332 hash = skb->sk->sk_hash;
2334 hash = (__force u16) skb->protocol ^
2336 hash = jhash_1word(hash, hashrnd);
2337 queue_index = map->queues[
2338 ((u64)hash * map->len) >> 32];
2340 if (unlikely(queue_index >= dev->real_num_tx_queues))
2352 static struct netdev_queue *dev_pick_tx(struct net_device *dev,
2353 struct sk_buff *skb)
2356 const struct net_device_ops *ops = dev->netdev_ops;
2358 if (dev->real_num_tx_queues == 1)
2360 else if (ops->ndo_select_queue) {
2361 queue_index = ops->ndo_select_queue(dev, skb);
2362 queue_index = dev_cap_txqueue(dev, queue_index);
2364 struct sock *sk = skb->sk;
2365 queue_index = sk_tx_queue_get(sk);
2367 if (queue_index < 0 || skb->ooo_okay ||
2368 queue_index >= dev->real_num_tx_queues) {
2369 int old_index = queue_index;
2371 queue_index = get_xps_queue(dev, skb);
2372 if (queue_index < 0)
2373 queue_index = skb_tx_hash(dev, skb);
2375 if (queue_index != old_index && sk) {
2376 struct dst_entry *dst =
2377 rcu_dereference_check(sk->sk_dst_cache, 1);
2379 if (dst && skb_dst(skb) == dst)
2380 sk_tx_queue_set(sk, queue_index);
2385 skb_set_queue_mapping(skb, queue_index);
2386 return netdev_get_tx_queue(dev, queue_index);
2389 static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
2390 struct net_device *dev,
2391 struct netdev_queue *txq)
2393 spinlock_t *root_lock = qdisc_lock(q);
2397 qdisc_skb_cb(skb)->pkt_len = skb->len;
2398 qdisc_calculate_pkt_len(skb, q);
2400 * Heuristic to force contended enqueues to serialize on a
2401 * separate lock before trying to get qdisc main lock.
2402 * This permits __QDISC_STATE_RUNNING owner to get the lock more often
2403 * and dequeue packets faster.
2405 contended = qdisc_is_running(q);
2406 if (unlikely(contended))
2407 spin_lock(&q->busylock);
2409 spin_lock(root_lock);
2410 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
2413 } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) &&
2414 qdisc_run_begin(q)) {
2416 * This is a work-conserving queue; there are no old skbs
2417 * waiting to be sent out; and the qdisc is not running -
2418 * xmit the skb directly.
2420 if (!(dev->priv_flags & IFF_XMIT_DST_RELEASE))
2423 qdisc_bstats_update(q, skb);
2425 if (sch_direct_xmit(skb, q, dev, txq, root_lock)) {
2426 if (unlikely(contended)) {
2427 spin_unlock(&q->busylock);
2434 rc = NET_XMIT_SUCCESS;
2437 rc = q->enqueue(skb, q) & NET_XMIT_MASK;
2438 if (qdisc_run_begin(q)) {
2439 if (unlikely(contended)) {
2440 spin_unlock(&q->busylock);
2446 spin_unlock(root_lock);
2447 if (unlikely(contended))
2448 spin_unlock(&q->busylock);
2452 static DEFINE_PER_CPU(int, xmit_recursion);
2453 #define RECURSION_LIMIT 10
2456 * dev_queue_xmit - transmit a buffer
2457 * @skb: buffer to transmit
2459 * Queue a buffer for transmission to a network device. The caller must
2460 * have set the device and priority and built the buffer before calling
2461 * this function. The function can be called from an interrupt.
2463 * A negative errno code is returned on a failure. A success does not
2464 * guarantee the frame will be transmitted as it may be dropped due
2465 * to congestion or traffic shaping.
2467 * -----------------------------------------------------------------------------------
2468 * I notice this method can also return errors from the queue disciplines,
2469 * including NET_XMIT_DROP, which is a positive value. So, errors can also
2472 * Regardless of the return value, the skb is consumed, so it is currently
2473 * difficult to retry a send to this method. (You can bump the ref count
2474 * before sending to hold a reference for retry if you are careful.)
2476 * When calling this method, interrupts MUST be enabled. This is because
2477 * the BH enable code must have IRQs enabled so that it will not deadlock.
2480 int dev_queue_xmit(struct sk_buff *skb)
2482 struct net_device *dev = skb->dev;
2483 struct netdev_queue *txq;
2487 /* Disable soft irqs for various locks below. Also
2488 * stops preemption for RCU.
2492 txq = dev_pick_tx(dev, skb);
2493 q = rcu_dereference_bh(txq->qdisc);
2495 #ifdef CONFIG_NET_CLS_ACT
2496 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS);
2498 trace_net_dev_queue(skb);
2500 rc = __dev_xmit_skb(skb, q, dev, txq);
2504 /* The device has no queue. Common case for software devices:
2505 loopback, all the sorts of tunnels...
2507 Really, it is unlikely that netif_tx_lock protection is necessary
2508 here. (f.e. loopback and IP tunnels are clean ignoring statistics
2510 However, it is possible, that they rely on protection
2513 Check this and shot the lock. It is not prone from deadlocks.
2514 Either shot noqueue qdisc, it is even simpler 8)
2516 if (dev->flags & IFF_UP) {
2517 int cpu = smp_processor_id(); /* ok because BHs are off */
2519 if (txq->xmit_lock_owner != cpu) {
2521 if (__this_cpu_read(xmit_recursion) > RECURSION_LIMIT)
2522 goto recursion_alert;
2524 HARD_TX_LOCK(dev, txq, cpu);
2526 if (!netif_tx_queue_stopped(txq)) {
2527 __this_cpu_inc(xmit_recursion);
2528 rc = dev_hard_start_xmit(skb, dev, txq);
2529 __this_cpu_dec(xmit_recursion);
2530 if (dev_xmit_complete(rc)) {
2531 HARD_TX_UNLOCK(dev, txq);
2535 HARD_TX_UNLOCK(dev, txq);
2536 if (net_ratelimit())
2537 printk(KERN_CRIT "Virtual device %s asks to "
2538 "queue packet!\n", dev->name);
2540 /* Recursion is detected! It is possible,
2544 if (net_ratelimit())
2545 printk(KERN_CRIT "Dead loop on virtual device "
2546 "%s, fix it urgently!\n", dev->name);
2551 rcu_read_unlock_bh();
2556 rcu_read_unlock_bh();
2559 EXPORT_SYMBOL(dev_queue_xmit);
2562 /*=======================================================================
2564 =======================================================================*/
2566 int netdev_max_backlog __read_mostly = 1000;
2567 int netdev_tstamp_prequeue __read_mostly = 1;
2568 int netdev_budget __read_mostly = 300;
2569 int weight_p __read_mostly = 64; /* old backlog weight */
2571 /* Called with irq disabled */
2572 static inline void ____napi_schedule(struct softnet_data *sd,
2573 struct napi_struct *napi)
2575 list_add_tail(&napi->poll_list, &sd->poll_list);
2576 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2580 * __skb_get_rxhash: calculate a flow hash based on src/dst addresses
2581 * and src/dst port numbers. Sets rxhash in skb to non-zero hash value
2582 * on success, zero indicates no valid hash. Also, sets l4_rxhash in skb
2583 * if hash is a canonical 4-tuple hash over transport ports.
2585 void __skb_get_rxhash(struct sk_buff *skb)
2587 int nhoff, hash = 0, poff;
2588 const struct ipv6hdr *ip6;
2589 const struct iphdr *ip;
2590 const struct vlan_hdr *vlan;
2599 nhoff = skb_network_offset(skb);
2600 proto = skb->protocol;
2604 case __constant_htons(ETH_P_IP):
2606 if (!pskb_may_pull(skb, sizeof(*ip) + nhoff))
2609 ip = (const struct iphdr *) (skb->data + nhoff);
2610 if (ip_is_fragment(ip))
2613 ip_proto = ip->protocol;
2614 addr1 = (__force u32) ip->saddr;
2615 addr2 = (__force u32) ip->daddr;
2616 nhoff += ip->ihl * 4;
2618 case __constant_htons(ETH_P_IPV6):
2620 if (!pskb_may_pull(skb, sizeof(*ip6) + nhoff))
2623 ip6 = (const struct ipv6hdr *) (skb->data + nhoff);
2624 ip_proto = ip6->nexthdr;
2625 addr1 = (__force u32) ip6->saddr.s6_addr32[3];
2626 addr2 = (__force u32) ip6->daddr.s6_addr32[3];
2629 case __constant_htons(ETH_P_8021Q):
2630 if (!pskb_may_pull(skb, sizeof(*vlan) + nhoff))
2632 vlan = (const struct vlan_hdr *) (skb->data + nhoff);
2633 proto = vlan->h_vlan_encapsulated_proto;
2634 nhoff += sizeof(*vlan);
2636 case __constant_htons(ETH_P_PPP_SES):
2637 if (!pskb_may_pull(skb, PPPOE_SES_HLEN + nhoff))
2639 proto = *((__be16 *) (skb->data + nhoff +
2640 sizeof(struct pppoe_hdr)));
2641 nhoff += PPPOE_SES_HLEN;
2643 case __constant_htons(PPP_IP):
2645 case __constant_htons(PPP_IPV6):
2656 if (pskb_may_pull(skb, nhoff + 16)) {
2657 u8 *h = skb->data + nhoff;
2658 __be16 flags = *(__be16 *)h;
2661 * Only look inside GRE if version zero and no
2664 if (!(flags & (GRE_VERSION|GRE_ROUTING))) {
2665 proto = *(__be16 *)(h + 2);
2667 if (flags & GRE_CSUM)
2669 if (flags & GRE_KEY)
2671 if (flags & GRE_SEQ)
2684 poff = proto_ports_offset(ip_proto);
2687 if (pskb_may_pull(skb, nhoff + 4)) {
2688 ports.v32 = * (__force u32 *) (skb->data + nhoff);
2693 /* get a consistent hash (same value on both flow directions) */
2694 if (addr2 < addr1 ||
2696 ports.v16[1] < ports.v16[0])) {
2698 swap(ports.v16[0], ports.v16[1]);
2700 hash = jhash_3words(addr1, addr2, ports.v32, hashrnd);
2707 EXPORT_SYMBOL(__skb_get_rxhash);
2711 /* One global table that all flow-based protocols share. */
2712 struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly;
2713 EXPORT_SYMBOL(rps_sock_flow_table);
2715 static struct rps_dev_flow *
2716 set_rps_cpu(struct net_device *dev, struct sk_buff *skb,
2717 struct rps_dev_flow *rflow, u16 next_cpu)
2719 if (next_cpu != RPS_NO_CPU) {
2720 #ifdef CONFIG_RFS_ACCEL
2721 struct netdev_rx_queue *rxqueue;
2722 struct rps_dev_flow_table *flow_table;
2723 struct rps_dev_flow *old_rflow;
2728 /* Should we steer this flow to a different hardware queue? */
2729 if (!skb_rx_queue_recorded(skb) || !dev->rx_cpu_rmap ||
2730 !(dev->features & NETIF_F_NTUPLE))
2732 rxq_index = cpu_rmap_lookup_index(dev->rx_cpu_rmap, next_cpu);
2733 if (rxq_index == skb_get_rx_queue(skb))
2736 rxqueue = dev->_rx + rxq_index;
2737 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2740 flow_id = skb->rxhash & flow_table->mask;
2741 rc = dev->netdev_ops->ndo_rx_flow_steer(dev, skb,
2742 rxq_index, flow_id);
2746 rflow = &flow_table->flows[flow_id];
2748 if (old_rflow->filter == rflow->filter)
2749 old_rflow->filter = RPS_NO_FILTER;
2753 per_cpu(softnet_data, next_cpu).input_queue_head;
2756 rflow->cpu = next_cpu;
2761 * get_rps_cpu is called from netif_receive_skb and returns the target
2762 * CPU from the RPS map of the receiving queue for a given skb.
2763 * rcu_read_lock must be held on entry.
2765 static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
2766 struct rps_dev_flow **rflowp)
2768 struct netdev_rx_queue *rxqueue;
2769 struct rps_map *map;
2770 struct rps_dev_flow_table *flow_table;
2771 struct rps_sock_flow_table *sock_flow_table;
2775 if (skb_rx_queue_recorded(skb)) {
2776 u16 index = skb_get_rx_queue(skb);
2777 if (unlikely(index >= dev->real_num_rx_queues)) {
2778 WARN_ONCE(dev->real_num_rx_queues > 1,
2779 "%s received packet on queue %u, but number "
2780 "of RX queues is %u\n",
2781 dev->name, index, dev->real_num_rx_queues);
2784 rxqueue = dev->_rx + index;
2788 map = rcu_dereference(rxqueue->rps_map);
2790 if (map->len == 1 &&
2791 !rcu_access_pointer(rxqueue->rps_flow_table)) {
2792 tcpu = map->cpus[0];
2793 if (cpu_online(tcpu))
2797 } else if (!rcu_access_pointer(rxqueue->rps_flow_table)) {
2801 skb_reset_network_header(skb);
2802 if (!skb_get_rxhash(skb))
2805 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2806 sock_flow_table = rcu_dereference(rps_sock_flow_table);
2807 if (flow_table && sock_flow_table) {
2809 struct rps_dev_flow *rflow;
2811 rflow = &flow_table->flows[skb->rxhash & flow_table->mask];
2814 next_cpu = sock_flow_table->ents[skb->rxhash &
2815 sock_flow_table->mask];
2818 * If the desired CPU (where last recvmsg was done) is
2819 * different from current CPU (one in the rx-queue flow
2820 * table entry), switch if one of the following holds:
2821 * - Current CPU is unset (equal to RPS_NO_CPU).
2822 * - Current CPU is offline.
2823 * - The current CPU's queue tail has advanced beyond the
2824 * last packet that was enqueued using this table entry.
2825 * This guarantees that all previous packets for the flow
2826 * have been dequeued, thus preserving in order delivery.
2828 if (unlikely(tcpu != next_cpu) &&
2829 (tcpu == RPS_NO_CPU || !cpu_online(tcpu) ||
2830 ((int)(per_cpu(softnet_data, tcpu).input_queue_head -
2831 rflow->last_qtail)) >= 0))
2832 rflow = set_rps_cpu(dev, skb, rflow, next_cpu);
2834 if (tcpu != RPS_NO_CPU && cpu_online(tcpu)) {
2842 tcpu = map->cpus[((u64) skb->rxhash * map->len) >> 32];
2844 if (cpu_online(tcpu)) {
2854 #ifdef CONFIG_RFS_ACCEL
2857 * rps_may_expire_flow - check whether an RFS hardware filter may be removed
2858 * @dev: Device on which the filter was set
2859 * @rxq_index: RX queue index
2860 * @flow_id: Flow ID passed to ndo_rx_flow_steer()
2861 * @filter_id: Filter ID returned by ndo_rx_flow_steer()
2863 * Drivers that implement ndo_rx_flow_steer() should periodically call
2864 * this function for each installed filter and remove the filters for
2865 * which it returns %true.
2867 bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index,
2868 u32 flow_id, u16 filter_id)
2870 struct netdev_rx_queue *rxqueue = dev->_rx + rxq_index;
2871 struct rps_dev_flow_table *flow_table;
2872 struct rps_dev_flow *rflow;
2877 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2878 if (flow_table && flow_id <= flow_table->mask) {
2879 rflow = &flow_table->flows[flow_id];
2880 cpu = ACCESS_ONCE(rflow->cpu);
2881 if (rflow->filter == filter_id && cpu != RPS_NO_CPU &&
2882 ((int)(per_cpu(softnet_data, cpu).input_queue_head -
2883 rflow->last_qtail) <
2884 (int)(10 * flow_table->mask)))
2890 EXPORT_SYMBOL(rps_may_expire_flow);
2892 #endif /* CONFIG_RFS_ACCEL */
2894 /* Called from hardirq (IPI) context */
2895 static void rps_trigger_softirq(void *data)
2897 struct softnet_data *sd = data;
2899 ____napi_schedule(sd, &sd->backlog);
2903 #endif /* CONFIG_RPS */
2906 * Check if this softnet_data structure is another cpu one
2907 * If yes, queue it to our IPI list and return 1
2910 static int rps_ipi_queued(struct softnet_data *sd)
2913 struct softnet_data *mysd = &__get_cpu_var(softnet_data);
2916 sd->rps_ipi_next = mysd->rps_ipi_list;
2917 mysd->rps_ipi_list = sd;
2919 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2922 #endif /* CONFIG_RPS */
2927 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
2928 * queue (may be a remote CPU queue).
2930 static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
2931 unsigned int *qtail)
2933 struct softnet_data *sd;
2934 unsigned long flags;
2936 sd = &per_cpu(softnet_data, cpu);
2938 local_irq_save(flags);
2941 if (skb_queue_len(&sd->input_pkt_queue) <= netdev_max_backlog) {
2942 if (skb_queue_len(&sd->input_pkt_queue)) {
2944 __skb_queue_tail(&sd->input_pkt_queue, skb);
2945 input_queue_tail_incr_save(sd, qtail);
2947 local_irq_restore(flags);
2948 return NET_RX_SUCCESS;
2951 /* Schedule NAPI for backlog device
2952 * We can use non atomic operation since we own the queue lock
2954 if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) {
2955 if (!rps_ipi_queued(sd))
2956 ____napi_schedule(sd, &sd->backlog);
2964 local_irq_restore(flags);
2966 atomic_long_inc(&skb->dev->rx_dropped);
2972 * netif_rx - post buffer to the network code
2973 * @skb: buffer to post
2975 * This function receives a packet from a device driver and queues it for
2976 * the upper (protocol) levels to process. It always succeeds. The buffer
2977 * may be dropped during processing for congestion control or by the
2981 * NET_RX_SUCCESS (no congestion)
2982 * NET_RX_DROP (packet was dropped)
2986 int netif_rx(struct sk_buff *skb)
2990 /* if netpoll wants it, pretend we never saw it */
2991 if (netpoll_rx(skb))
2994 if (netdev_tstamp_prequeue)
2995 net_timestamp_check(skb);
2997 trace_netif_rx(skb);
3000 struct rps_dev_flow voidflow, *rflow = &voidflow;
3006 cpu = get_rps_cpu(skb->dev, skb, &rflow);
3008 cpu = smp_processor_id();
3010 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
3018 ret = enqueue_to_backlog(skb, get_cpu(), &qtail);
3024 EXPORT_SYMBOL(netif_rx);
3026 int netif_rx_ni(struct sk_buff *skb)
3031 err = netif_rx(skb);
3032 if (local_softirq_pending())
3038 EXPORT_SYMBOL(netif_rx_ni);
3040 static void net_tx_action(struct softirq_action *h)
3042 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3044 if (sd->completion_queue) {
3045 struct sk_buff *clist;
3047 local_irq_disable();
3048 clist = sd->completion_queue;
3049 sd->completion_queue = NULL;
3053 struct sk_buff *skb = clist;
3054 clist = clist->next;
3056 WARN_ON(atomic_read(&skb->users));
3057 trace_kfree_skb(skb, net_tx_action);
3062 if (sd->output_queue) {
3065 local_irq_disable();
3066 head = sd->output_queue;
3067 sd->output_queue = NULL;
3068 sd->output_queue_tailp = &sd->output_queue;
3072 struct Qdisc *q = head;
3073 spinlock_t *root_lock;
3075 head = head->next_sched;
3077 root_lock = qdisc_lock(q);
3078 if (spin_trylock(root_lock)) {
3079 smp_mb__before_clear_bit();
3080 clear_bit(__QDISC_STATE_SCHED,
3083 spin_unlock(root_lock);
3085 if (!test_bit(__QDISC_STATE_DEACTIVATED,
3087 __netif_reschedule(q);
3089 smp_mb__before_clear_bit();
3090 clear_bit(__QDISC_STATE_SCHED,
3098 #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
3099 (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
3100 /* This hook is defined here for ATM LANE */
3101 int (*br_fdb_test_addr_hook)(struct net_device *dev,
3102 unsigned char *addr) __read_mostly;
3103 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
3106 #ifdef CONFIG_NET_CLS_ACT
3107 /* TODO: Maybe we should just force sch_ingress to be compiled in
3108 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
3109 * a compare and 2 stores extra right now if we dont have it on
3110 * but have CONFIG_NET_CLS_ACT
3111 * NOTE: This doesn't stop any functionality; if you dont have
3112 * the ingress scheduler, you just can't add policies on ingress.
3115 static int ing_filter(struct sk_buff *skb, struct netdev_queue *rxq)
3117 struct net_device *dev = skb->dev;
3118 u32 ttl = G_TC_RTTL(skb->tc_verd);
3119 int result = TC_ACT_OK;
3122 if (unlikely(MAX_RED_LOOP < ttl++)) {
3123 if (net_ratelimit())
3124 pr_warning( "Redir loop detected Dropping packet (%d->%d)\n",
3125 skb->skb_iif, dev->ifindex);
3129 skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
3130 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
3133 if (q != &noop_qdisc) {
3134 spin_lock(qdisc_lock(q));
3135 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
3136 result = qdisc_enqueue_root(skb, q);
3137 spin_unlock(qdisc_lock(q));
3143 static inline struct sk_buff *handle_ing(struct sk_buff *skb,
3144 struct packet_type **pt_prev,
3145 int *ret, struct net_device *orig_dev)
3147 struct netdev_queue *rxq = rcu_dereference(skb->dev->ingress_queue);
3149 if (!rxq || rxq->qdisc == &noop_qdisc)
3153 *ret = deliver_skb(skb, *pt_prev, orig_dev);
3157 switch (ing_filter(skb, rxq)) {
3171 * netdev_rx_handler_register - register receive handler
3172 * @dev: device to register a handler for
3173 * @rx_handler: receive handler to register
3174 * @rx_handler_data: data pointer that is used by rx handler
3176 * Register a receive hander for a device. This handler will then be
3177 * called from __netif_receive_skb. A negative errno code is returned
3180 * The caller must hold the rtnl_mutex.
3182 * For a general description of rx_handler, see enum rx_handler_result.
3184 int netdev_rx_handler_register(struct net_device *dev,
3185 rx_handler_func_t *rx_handler,
3186 void *rx_handler_data)
3190 if (dev->rx_handler)
3193 rcu_assign_pointer(dev->rx_handler_data, rx_handler_data);
3194 rcu_assign_pointer(dev->rx_handler, rx_handler);
3198 EXPORT_SYMBOL_GPL(netdev_rx_handler_register);
3201 * netdev_rx_handler_unregister - unregister receive handler
3202 * @dev: device to unregister a handler from
3204 * Unregister a receive hander from a device.
3206 * The caller must hold the rtnl_mutex.
3208 void netdev_rx_handler_unregister(struct net_device *dev)
3212 RCU_INIT_POINTER(dev->rx_handler, NULL);
3213 RCU_INIT_POINTER(dev->rx_handler_data, NULL);
3215 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister);
3217 static int __netif_receive_skb(struct sk_buff *skb)
3219 struct packet_type *ptype, *pt_prev;
3220 rx_handler_func_t *rx_handler;
3221 struct net_device *orig_dev;
3222 struct net_device *null_or_dev;
3223 bool deliver_exact = false;
3224 int ret = NET_RX_DROP;
3227 if (!netdev_tstamp_prequeue)
3228 net_timestamp_check(skb);
3230 trace_netif_receive_skb(skb);
3232 /* if we've gotten here through NAPI, check netpoll */
3233 if (netpoll_receive_skb(skb))
3237 skb->skb_iif = skb->dev->ifindex;
3238 orig_dev = skb->dev;
3240 skb_reset_network_header(skb);
3241 skb_reset_transport_header(skb);
3242 skb_reset_mac_len(skb);
3250 __this_cpu_inc(softnet_data.processed);
3252 if (skb->protocol == cpu_to_be16(ETH_P_8021Q)) {
3253 skb = vlan_untag(skb);
3258 #ifdef CONFIG_NET_CLS_ACT
3259 if (skb->tc_verd & TC_NCLS) {
3260 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
3265 list_for_each_entry_rcu(ptype, &ptype_all, list) {
3266 if (!ptype->dev || ptype->dev == skb->dev) {
3268 ret = deliver_skb(skb, pt_prev, orig_dev);
3273 #ifdef CONFIG_NET_CLS_ACT
3274 skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
3280 rx_handler = rcu_dereference(skb->dev->rx_handler);
3281 if (vlan_tx_tag_present(skb)) {
3283 ret = deliver_skb(skb, pt_prev, orig_dev);
3286 if (vlan_do_receive(&skb, !rx_handler))
3288 else if (unlikely(!skb))
3294 ret = deliver_skb(skb, pt_prev, orig_dev);
3297 switch (rx_handler(&skb)) {
3298 case RX_HANDLER_CONSUMED:
3300 case RX_HANDLER_ANOTHER:
3302 case RX_HANDLER_EXACT:
3303 deliver_exact = true;
3304 case RX_HANDLER_PASS:
3311 /* deliver only exact match when indicated */
3312 null_or_dev = deliver_exact ? skb->dev : NULL;
3314 type = skb->protocol;
3315 list_for_each_entry_rcu(ptype,
3316 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
3317 if (ptype->type == type &&
3318 (ptype->dev == null_or_dev || ptype->dev == skb->dev ||
3319 ptype->dev == orig_dev)) {
3321 ret = deliver_skb(skb, pt_prev, orig_dev);
3327 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
3329 atomic_long_inc(&skb->dev->rx_dropped);
3331 /* Jamal, now you will not able to escape explaining
3332 * me how you were going to use this. :-)
3343 * netif_receive_skb - process receive buffer from network
3344 * @skb: buffer to process
3346 * netif_receive_skb() is the main receive data processing function.
3347 * It always succeeds. The buffer may be dropped during processing
3348 * for congestion control or by the protocol layers.
3350 * This function may only be called from softirq context and interrupts
3351 * should be enabled.
3353 * Return values (usually ignored):
3354 * NET_RX_SUCCESS: no congestion
3355 * NET_RX_DROP: packet was dropped
3357 int netif_receive_skb(struct sk_buff *skb)
3359 if (netdev_tstamp_prequeue)
3360 net_timestamp_check(skb);
3362 if (skb_defer_rx_timestamp(skb))
3363 return NET_RX_SUCCESS;
3367 struct rps_dev_flow voidflow, *rflow = &voidflow;
3372 cpu = get_rps_cpu(skb->dev, skb, &rflow);
3375 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
3379 ret = __netif_receive_skb(skb);
3385 return __netif_receive_skb(skb);
3388 EXPORT_SYMBOL(netif_receive_skb);
3390 /* Network device is going away, flush any packets still pending
3391 * Called with irqs disabled.
3393 static void flush_backlog(void *arg)
3395 struct net_device *dev = arg;
3396 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3397 struct sk_buff *skb, *tmp;
3400 skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) {
3401 if (skb->dev == dev) {
3402 __skb_unlink(skb, &sd->input_pkt_queue);
3404 input_queue_head_incr(sd);
3409 skb_queue_walk_safe(&sd->process_queue, skb, tmp) {
3410 if (skb->dev == dev) {
3411 __skb_unlink(skb, &sd->process_queue);
3413 input_queue_head_incr(sd);
3418 static int napi_gro_complete(struct sk_buff *skb)
3420 struct packet_type *ptype;
3421 __be16 type = skb->protocol;
3422 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
3425 if (NAPI_GRO_CB(skb)->count == 1) {
3426 skb_shinfo(skb)->gso_size = 0;
3431 list_for_each_entry_rcu(ptype, head, list) {
3432 if (ptype->type != type || ptype->dev || !ptype->gro_complete)
3435 err = ptype->gro_complete(skb);
3441 WARN_ON(&ptype->list == head);
3443 return NET_RX_SUCCESS;
3447 return netif_receive_skb(skb);
3450 inline void napi_gro_flush(struct napi_struct *napi)
3452 struct sk_buff *skb, *next;
3454 for (skb = napi->gro_list; skb; skb = next) {
3457 napi_gro_complete(skb);
3460 napi->gro_count = 0;
3461 napi->gro_list = NULL;
3463 EXPORT_SYMBOL(napi_gro_flush);
3465 enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3467 struct sk_buff **pp = NULL;
3468 struct packet_type *ptype;
3469 __be16 type = skb->protocol;
3470 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
3473 enum gro_result ret;
3475 if (!(skb->dev->features & NETIF_F_GRO) || netpoll_rx_on(skb))
3478 if (skb_is_gso(skb) || skb_has_frag_list(skb))
3482 list_for_each_entry_rcu(ptype, head, list) {
3483 if (ptype->type != type || ptype->dev || !ptype->gro_receive)
3486 skb_set_network_header(skb, skb_gro_offset(skb));
3487 mac_len = skb->network_header - skb->mac_header;
3488 skb->mac_len = mac_len;
3489 NAPI_GRO_CB(skb)->same_flow = 0;
3490 NAPI_GRO_CB(skb)->flush = 0;
3491 NAPI_GRO_CB(skb)->free = 0;
3493 pp = ptype->gro_receive(&napi->gro_list, skb);
3498 if (&ptype->list == head)
3501 same_flow = NAPI_GRO_CB(skb)->same_flow;
3502 ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
3505 struct sk_buff *nskb = *pp;
3509 napi_gro_complete(nskb);
3516 if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS)
3520 NAPI_GRO_CB(skb)->count = 1;
3521 skb_shinfo(skb)->gso_size = skb_gro_len(skb);
3522 skb->next = napi->gro_list;
3523 napi->gro_list = skb;
3527 if (skb_headlen(skb) < skb_gro_offset(skb)) {
3528 int grow = skb_gro_offset(skb) - skb_headlen(skb);
3530 BUG_ON(skb->end - skb->tail < grow);
3532 memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);
3535 skb->data_len -= grow;
3537 skb_shinfo(skb)->frags[0].page_offset += grow;
3538 skb_frag_size_sub(&skb_shinfo(skb)->frags[0], grow);
3540 if (unlikely(!skb_frag_size(&skb_shinfo(skb)->frags[0]))) {
3541 skb_frag_unref(skb, 0);
3542 memmove(skb_shinfo(skb)->frags,
3543 skb_shinfo(skb)->frags + 1,
3544 --skb_shinfo(skb)->nr_frags * sizeof(skb_frag_t));
3555 EXPORT_SYMBOL(dev_gro_receive);
3557 static inline gro_result_t
3558 __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3561 unsigned int maclen = skb->dev->hard_header_len;
3563 for (p = napi->gro_list; p; p = p->next) {
3564 unsigned long diffs;
3566 diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev;
3567 diffs |= p->vlan_tci ^ skb->vlan_tci;
3568 if (maclen == ETH_HLEN)
3569 diffs |= compare_ether_header(skb_mac_header(p),
3570 skb_gro_mac_header(skb));
3572 diffs = memcmp(skb_mac_header(p),
3573 skb_gro_mac_header(skb),
3575 NAPI_GRO_CB(p)->same_flow = !diffs;
3576 NAPI_GRO_CB(p)->flush = 0;
3579 return dev_gro_receive(napi, skb);
3582 gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
3586 if (netif_receive_skb(skb))
3591 case GRO_MERGED_FREE:
3602 EXPORT_SYMBOL(napi_skb_finish);
3604 void skb_gro_reset_offset(struct sk_buff *skb)
3606 NAPI_GRO_CB(skb)->data_offset = 0;
3607 NAPI_GRO_CB(skb)->frag0 = NULL;
3608 NAPI_GRO_CB(skb)->frag0_len = 0;
3610 if (skb->mac_header == skb->tail &&
3611 !PageHighMem(skb_frag_page(&skb_shinfo(skb)->frags[0]))) {
3612 NAPI_GRO_CB(skb)->frag0 =
3613 skb_frag_address(&skb_shinfo(skb)->frags[0]);
3614 NAPI_GRO_CB(skb)->frag0_len = skb_frag_size(&skb_shinfo(skb)->frags[0]);
3617 EXPORT_SYMBOL(skb_gro_reset_offset);
3619 gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3621 skb_gro_reset_offset(skb);
3623 return napi_skb_finish(__napi_gro_receive(napi, skb), skb);
3625 EXPORT_SYMBOL(napi_gro_receive);
3627 static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
3629 __skb_pull(skb, skb_headlen(skb));
3630 /* restore the reserve we had after netdev_alloc_skb_ip_align() */
3631 skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN - skb_headroom(skb));
3633 skb->dev = napi->dev;
3639 struct sk_buff *napi_get_frags(struct napi_struct *napi)
3641 struct sk_buff *skb = napi->skb;
3644 skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD);
3650 EXPORT_SYMBOL(napi_get_frags);
3652 gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb,
3658 skb->protocol = eth_type_trans(skb, skb->dev);
3660 if (ret == GRO_HELD)
3661 skb_gro_pull(skb, -ETH_HLEN);
3662 else if (netif_receive_skb(skb))
3667 case GRO_MERGED_FREE:
3668 napi_reuse_skb(napi, skb);
3677 EXPORT_SYMBOL(napi_frags_finish);
3679 struct sk_buff *napi_frags_skb(struct napi_struct *napi)
3681 struct sk_buff *skb = napi->skb;
3688 skb_reset_mac_header(skb);
3689 skb_gro_reset_offset(skb);
3691 off = skb_gro_offset(skb);
3692 hlen = off + sizeof(*eth);
3693 eth = skb_gro_header_fast(skb, off);
3694 if (skb_gro_header_hard(skb, hlen)) {
3695 eth = skb_gro_header_slow(skb, hlen, off);
3696 if (unlikely(!eth)) {
3697 napi_reuse_skb(napi, skb);
3703 skb_gro_pull(skb, sizeof(*eth));
3706 * This works because the only protocols we care about don't require
3707 * special handling. We'll fix it up properly at the end.
3709 skb->protocol = eth->h_proto;
3714 EXPORT_SYMBOL(napi_frags_skb);
3716 gro_result_t napi_gro_frags(struct napi_struct *napi)
3718 struct sk_buff *skb = napi_frags_skb(napi);
3723 return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb));
3725 EXPORT_SYMBOL(napi_gro_frags);
3728 * net_rps_action sends any pending IPI's for rps.
3729 * Note: called with local irq disabled, but exits with local irq enabled.
3731 static void net_rps_action_and_irq_enable(struct softnet_data *sd)
3734 struct softnet_data *remsd = sd->rps_ipi_list;
3737 sd->rps_ipi_list = NULL;
3741 /* Send pending IPI's to kick RPS processing on remote cpus. */
3743 struct softnet_data *next = remsd->rps_ipi_next;
3745 if (cpu_online(remsd->cpu))
3746 __smp_call_function_single(remsd->cpu,
3755 static int process_backlog(struct napi_struct *napi, int quota)
3758 struct softnet_data *sd = container_of(napi, struct softnet_data, backlog);
3761 /* Check if we have pending ipi, its better to send them now,
3762 * not waiting net_rx_action() end.
3764 if (sd->rps_ipi_list) {
3765 local_irq_disable();
3766 net_rps_action_and_irq_enable(sd);
3769 napi->weight = weight_p;
3770 local_irq_disable();
3771 while (work < quota) {
3772 struct sk_buff *skb;
3775 while ((skb = __skb_dequeue(&sd->process_queue))) {
3777 __netif_receive_skb(skb);
3778 local_irq_disable();
3779 input_queue_head_incr(sd);
3780 if (++work >= quota) {
3787 qlen = skb_queue_len(&sd->input_pkt_queue);
3789 skb_queue_splice_tail_init(&sd->input_pkt_queue,
3790 &sd->process_queue);
3792 if (qlen < quota - work) {
3794 * Inline a custom version of __napi_complete().
3795 * only current cpu owns and manipulates this napi,
3796 * and NAPI_STATE_SCHED is the only possible flag set on backlog.
3797 * we can use a plain write instead of clear_bit(),
3798 * and we dont need an smp_mb() memory barrier.
3800 list_del(&napi->poll_list);
3803 quota = work + qlen;
3813 * __napi_schedule - schedule for receive
3814 * @n: entry to schedule
3816 * The entry's receive function will be scheduled to run
3818 void __napi_schedule(struct napi_struct *n)
3820 unsigned long flags;
3822 local_irq_save(flags);
3823 ____napi_schedule(&__get_cpu_var(softnet_data), n);
3824 local_irq_restore(flags);
3826 EXPORT_SYMBOL(__napi_schedule);
3828 void __napi_complete(struct napi_struct *n)
3830 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
3831 BUG_ON(n->gro_list);
3833 list_del(&n->poll_list);
3834 smp_mb__before_clear_bit();
3835 clear_bit(NAPI_STATE_SCHED, &n->state);
3837 EXPORT_SYMBOL(__napi_complete);
3839 void napi_complete(struct napi_struct *n)
3841 unsigned long flags;
3844 * don't let napi dequeue from the cpu poll list
3845 * just in case its running on a different cpu
3847 if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state)))
3851 local_irq_save(flags);
3853 local_irq_restore(flags);
3855 EXPORT_SYMBOL(napi_complete);
3857 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
3858 int (*poll)(struct napi_struct *, int), int weight)
3860 INIT_LIST_HEAD(&napi->poll_list);
3861 napi->gro_count = 0;
3862 napi->gro_list = NULL;
3865 napi->weight = weight;
3866 list_add(&napi->dev_list, &dev->napi_list);
3868 #ifdef CONFIG_NETPOLL
3869 spin_lock_init(&napi->poll_lock);
3870 napi->poll_owner = -1;
3872 set_bit(NAPI_STATE_SCHED, &napi->state);
3874 EXPORT_SYMBOL(netif_napi_add);
3876 void netif_napi_del(struct napi_struct *napi)
3878 struct sk_buff *skb, *next;
3880 list_del_init(&napi->dev_list);
3881 napi_free_frags(napi);
3883 for (skb = napi->gro_list; skb; skb = next) {
3889 napi->gro_list = NULL;
3890 napi->gro_count = 0;
3892 EXPORT_SYMBOL(netif_napi_del);
3894 static void net_rx_action(struct softirq_action *h)
3896 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3897 unsigned long time_limit = jiffies + 2;
3898 int budget = netdev_budget;
3901 local_irq_disable();
3903 while (!list_empty(&sd->poll_list)) {
3904 struct napi_struct *n;
3907 /* If softirq window is exhuasted then punt.
3908 * Allow this to run for 2 jiffies since which will allow
3909 * an average latency of 1.5/HZ.
3911 if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
3916 /* Even though interrupts have been re-enabled, this
3917 * access is safe because interrupts can only add new
3918 * entries to the tail of this list, and only ->poll()
3919 * calls can remove this head entry from the list.
3921 n = list_first_entry(&sd->poll_list, struct napi_struct, poll_list);
3923 have = netpoll_poll_lock(n);
3927 /* This NAPI_STATE_SCHED test is for avoiding a race
3928 * with netpoll's poll_napi(). Only the entity which
3929 * obtains the lock and sees NAPI_STATE_SCHED set will
3930 * actually make the ->poll() call. Therefore we avoid
3931 * accidentally calling ->poll() when NAPI is not scheduled.
3934 if (test_bit(NAPI_STATE_SCHED, &n->state)) {
3935 work = n->poll(n, weight);
3939 WARN_ON_ONCE(work > weight);
3943 local_irq_disable();
3945 /* Drivers must not modify the NAPI state if they
3946 * consume the entire weight. In such cases this code
3947 * still "owns" the NAPI instance and therefore can
3948 * move the instance around on the list at-will.
3950 if (unlikely(work == weight)) {
3951 if (unlikely(napi_disable_pending(n))) {
3954 local_irq_disable();
3956 list_move_tail(&n->poll_list, &sd->poll_list);
3959 netpoll_poll_unlock(have);
3962 net_rps_action_and_irq_enable(sd);
3964 #ifdef CONFIG_NET_DMA
3966 * There may not be any more sk_buffs coming right now, so push
3967 * any pending DMA copies to hardware
3969 dma_issue_pending_all();
3976 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3980 static gifconf_func_t *gifconf_list[NPROTO];
3983 * register_gifconf - register a SIOCGIF handler
3984 * @family: Address family
3985 * @gifconf: Function handler
3987 * Register protocol dependent address dumping routines. The handler
3988 * that is passed must not be freed or reused until it has been replaced
3989 * by another handler.
3991 int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
3993 if (family >= NPROTO)
3995 gifconf_list[family] = gifconf;
3998 EXPORT_SYMBOL(register_gifconf);
4002 * Map an interface index to its name (SIOCGIFNAME)
4006 * We need this ioctl for efficient implementation of the
4007 * if_indextoname() function required by the IPv6 API. Without
4008 * it, we would have to search all the interfaces to find a
4012 static int dev_ifname(struct net *net, struct ifreq __user *arg)
4014 struct net_device *dev;
4018 * Fetch the caller's info block.
4021 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
4025 dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex);
4031 strcpy(ifr.ifr_name, dev->name);
4034 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
4040 * Perform a SIOCGIFCONF call. This structure will change
4041 * size eventually, and there is nothing I can do about it.
4042 * Thus we will need a 'compatibility mode'.
4045 static int dev_ifconf(struct net *net, char __user *arg)
4048 struct net_device *dev;
4055 * Fetch the caller's info block.
4058 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
4065 * Loop over the interfaces, and write an info block for each.
4069 for_each_netdev(net, dev) {
4070 for (i = 0; i < NPROTO; i++) {
4071 if (gifconf_list[i]) {
4074 done = gifconf_list[i](dev, NULL, 0);
4076 done = gifconf_list[i](dev, pos + total,
4086 * All done. Write the updated control block back to the caller.
4088 ifc.ifc_len = total;
4091 * Both BSD and Solaris return 0 here, so we do too.
4093 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
4096 #ifdef CONFIG_PROC_FS
4098 #define BUCKET_SPACE (32 - NETDEV_HASHBITS - 1)
4100 #define get_bucket(x) ((x) >> BUCKET_SPACE)
4101 #define get_offset(x) ((x) & ((1 << BUCKET_SPACE) - 1))
4102 #define set_bucket_offset(b, o) ((b) << BUCKET_SPACE | (o))
4104 static inline struct net_device *dev_from_same_bucket(struct seq_file *seq, loff_t *pos)
4106 struct net *net = seq_file_net(seq);
4107 struct net_device *dev;
4108 struct hlist_node *p;
4109 struct hlist_head *h;
4110 unsigned int count = 0, offset = get_offset(*pos);
4112 h = &net->dev_name_head[get_bucket(*pos)];
4113 hlist_for_each_entry_rcu(dev, p, h, name_hlist) {
4114 if (++count == offset)
4121 static inline struct net_device *dev_from_bucket(struct seq_file *seq, loff_t *pos)
4123 struct net_device *dev;
4124 unsigned int bucket;
4127 dev = dev_from_same_bucket(seq, pos);
4131 bucket = get_bucket(*pos) + 1;
4132 *pos = set_bucket_offset(bucket, 1);
4133 } while (bucket < NETDEV_HASHENTRIES);
4139 * This is invoked by the /proc filesystem handler to display a device
4142 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
4147 return SEQ_START_TOKEN;
4149 if (get_bucket(*pos) >= NETDEV_HASHENTRIES)
4152 return dev_from_bucket(seq, pos);
4155 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4158 return dev_from_bucket(seq, pos);
4161 void dev_seq_stop(struct seq_file *seq, void *v)
4167 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
4169 struct rtnl_link_stats64 temp;
4170 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
4172 seq_printf(seq, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu "
4173 "%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n",
4174 dev->name, stats->rx_bytes, stats->rx_packets,
4176 stats->rx_dropped + stats->rx_missed_errors,
4177 stats->rx_fifo_errors,
4178 stats->rx_length_errors + stats->rx_over_errors +
4179 stats->rx_crc_errors + stats->rx_frame_errors,
4180 stats->rx_compressed, stats->multicast,
4181 stats->tx_bytes, stats->tx_packets,
4182 stats->tx_errors, stats->tx_dropped,
4183 stats->tx_fifo_errors, stats->collisions,
4184 stats->tx_carrier_errors +
4185 stats->tx_aborted_errors +
4186 stats->tx_window_errors +
4187 stats->tx_heartbeat_errors,
4188 stats->tx_compressed);
4192 * Called from the PROCfs module. This now uses the new arbitrary sized
4193 * /proc/net interface to create /proc/net/dev
4195 static int dev_seq_show(struct seq_file *seq, void *v)
4197 if (v == SEQ_START_TOKEN)
4198 seq_puts(seq, "Inter-| Receive "
4200 " face |bytes packets errs drop fifo frame "
4201 "compressed multicast|bytes packets errs "
4202 "drop fifo colls carrier compressed\n");
4204 dev_seq_printf_stats(seq, v);
4208 static struct softnet_data *softnet_get_online(loff_t *pos)
4210 struct softnet_data *sd = NULL;
4212 while (*pos < nr_cpu_ids)
4213 if (cpu_online(*pos)) {
4214 sd = &per_cpu(softnet_data, *pos);
4221 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
4223 return softnet_get_online(pos);
4226 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4229 return softnet_get_online(pos);
4232 static void softnet_seq_stop(struct seq_file *seq, void *v)
4236 static int softnet_seq_show(struct seq_file *seq, void *v)
4238 struct softnet_data *sd = v;
4240 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
4241 sd->processed, sd->dropped, sd->time_squeeze, 0,
4242 0, 0, 0, 0, /* was fastroute */
4243 sd->cpu_collision, sd->received_rps);
4247 static const struct seq_operations dev_seq_ops = {
4248 .start = dev_seq_start,
4249 .next = dev_seq_next,
4250 .stop = dev_seq_stop,
4251 .show = dev_seq_show,
4254 static int dev_seq_open(struct inode *inode, struct file *file)
4256 return seq_open_net(inode, file, &dev_seq_ops,
4257 sizeof(struct seq_net_private));
4260 static const struct file_operations dev_seq_fops = {
4261 .owner = THIS_MODULE,
4262 .open = dev_seq_open,
4264 .llseek = seq_lseek,
4265 .release = seq_release_net,
4268 static const struct seq_operations softnet_seq_ops = {
4269 .start = softnet_seq_start,
4270 .next = softnet_seq_next,
4271 .stop = softnet_seq_stop,
4272 .show = softnet_seq_show,
4275 static int softnet_seq_open(struct inode *inode, struct file *file)
4277 return seq_open(file, &softnet_seq_ops);
4280 static const struct file_operations softnet_seq_fops = {
4281 .owner = THIS_MODULE,
4282 .open = softnet_seq_open,
4284 .llseek = seq_lseek,
4285 .release = seq_release,
4288 static void *ptype_get_idx(loff_t pos)
4290 struct packet_type *pt = NULL;
4294 list_for_each_entry_rcu(pt, &ptype_all, list) {
4300 for (t = 0; t < PTYPE_HASH_SIZE; t++) {
4301 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
4310 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
4314 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
4317 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4319 struct packet_type *pt;
4320 struct list_head *nxt;
4324 if (v == SEQ_START_TOKEN)
4325 return ptype_get_idx(0);
4328 nxt = pt->list.next;
4329 if (pt->type == htons(ETH_P_ALL)) {
4330 if (nxt != &ptype_all)
4333 nxt = ptype_base[0].next;
4335 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
4337 while (nxt == &ptype_base[hash]) {
4338 if (++hash >= PTYPE_HASH_SIZE)
4340 nxt = ptype_base[hash].next;
4343 return list_entry(nxt, struct packet_type, list);
4346 static void ptype_seq_stop(struct seq_file *seq, void *v)
4352 static int ptype_seq_show(struct seq_file *seq, void *v)
4354 struct packet_type *pt = v;
4356 if (v == SEQ_START_TOKEN)
4357 seq_puts(seq, "Type Device Function\n");
4358 else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
4359 if (pt->type == htons(ETH_P_ALL))
4360 seq_puts(seq, "ALL ");
4362 seq_printf(seq, "%04x", ntohs(pt->type));
4364 seq_printf(seq, " %-8s %pF\n",
4365 pt->dev ? pt->dev->name : "", pt->func);
4371 static const struct seq_operations ptype_seq_ops = {
4372 .start = ptype_seq_start,
4373 .next = ptype_seq_next,
4374 .stop = ptype_seq_stop,
4375 .show = ptype_seq_show,
4378 static int ptype_seq_open(struct inode *inode, struct file *file)
4380 return seq_open_net(inode, file, &ptype_seq_ops,
4381 sizeof(struct seq_net_private));
4384 static const struct file_operations ptype_seq_fops = {
4385 .owner = THIS_MODULE,
4386 .open = ptype_seq_open,
4388 .llseek = seq_lseek,
4389 .release = seq_release_net,
4393 static int __net_init dev_proc_net_init(struct net *net)
4397 if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
4399 if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
4401 if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
4404 if (wext_proc_init(net))
4410 proc_net_remove(net, "ptype");
4412 proc_net_remove(net, "softnet_stat");
4414 proc_net_remove(net, "dev");
4418 static void __net_exit dev_proc_net_exit(struct net *net)
4420 wext_proc_exit(net);
4422 proc_net_remove(net, "ptype");
4423 proc_net_remove(net, "softnet_stat");
4424 proc_net_remove(net, "dev");
4427 static struct pernet_operations __net_initdata dev_proc_ops = {
4428 .init = dev_proc_net_init,
4429 .exit = dev_proc_net_exit,
4432 static int __init dev_proc_init(void)
4434 return register_pernet_subsys(&dev_proc_ops);
4437 #define dev_proc_init() 0
4438 #endif /* CONFIG_PROC_FS */
4442 * netdev_set_master - set up master pointer
4443 * @slave: slave device
4444 * @master: new master device
4446 * Changes the master device of the slave. Pass %NULL to break the
4447 * bonding. The caller must hold the RTNL semaphore. On a failure
4448 * a negative errno code is returned. On success the reference counts
4449 * are adjusted and the function returns zero.
4451 int netdev_set_master(struct net_device *slave, struct net_device *master)
4453 struct net_device *old = slave->master;
4463 slave->master = master;
4469 EXPORT_SYMBOL(netdev_set_master);
4472 * netdev_set_bond_master - set up bonding master/slave pair
4473 * @slave: slave device
4474 * @master: new master device
4476 * Changes the master device of the slave. Pass %NULL to break the
4477 * bonding. The caller must hold the RTNL semaphore. On a failure
4478 * a negative errno code is returned. On success %RTM_NEWLINK is sent
4479 * to the routing socket and the function returns zero.
4481 int netdev_set_bond_master(struct net_device *slave, struct net_device *master)
4487 err = netdev_set_master(slave, master);
4491 slave->flags |= IFF_SLAVE;
4493 slave->flags &= ~IFF_SLAVE;
4495 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
4498 EXPORT_SYMBOL(netdev_set_bond_master);
4500 static void dev_change_rx_flags(struct net_device *dev, int flags)
4502 const struct net_device_ops *ops = dev->netdev_ops;
4504 if ((dev->flags & IFF_UP) && ops->ndo_change_rx_flags)
4505 ops->ndo_change_rx_flags(dev, flags);
4508 static int __dev_set_promiscuity(struct net_device *dev, int inc)
4510 unsigned short old_flags = dev->flags;
4516 dev->flags |= IFF_PROMISC;
4517 dev->promiscuity += inc;
4518 if (dev->promiscuity == 0) {
4521 * If inc causes overflow, untouch promisc and return error.
4524 dev->flags &= ~IFF_PROMISC;
4526 dev->promiscuity -= inc;
4527 printk(KERN_WARNING "%s: promiscuity touches roof, "
4528 "set promiscuity failed, promiscuity feature "
4529 "of device might be broken.\n", dev->name);
4533 if (dev->flags != old_flags) {
4534 printk(KERN_INFO "device %s %s promiscuous mode\n",
4535 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
4537 if (audit_enabled) {
4538 current_uid_gid(&uid, &gid);
4539 audit_log(current->audit_context, GFP_ATOMIC,
4540 AUDIT_ANOM_PROMISCUOUS,
4541 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
4542 dev->name, (dev->flags & IFF_PROMISC),
4543 (old_flags & IFF_PROMISC),
4544 audit_get_loginuid(current),
4546 audit_get_sessionid(current));
4549 dev_change_rx_flags(dev, IFF_PROMISC);
4555 * dev_set_promiscuity - update promiscuity count on a device
4559 * Add or remove promiscuity from a device. While the count in the device
4560 * remains above zero the interface remains promiscuous. Once it hits zero
4561 * the device reverts back to normal filtering operation. A negative inc
4562 * value is used to drop promiscuity on the device.
4563 * Return 0 if successful or a negative errno code on error.
4565 int dev_set_promiscuity(struct net_device *dev, int inc)
4567 unsigned short old_flags = dev->flags;
4570 err = __dev_set_promiscuity(dev, inc);
4573 if (dev->flags != old_flags)
4574 dev_set_rx_mode(dev);
4577 EXPORT_SYMBOL(dev_set_promiscuity);
4580 * dev_set_allmulti - update allmulti count on a device
4584 * Add or remove reception of all multicast frames to a device. While the
4585 * count in the device remains above zero the interface remains listening
4586 * to all interfaces. Once it hits zero the device reverts back to normal
4587 * filtering operation. A negative @inc value is used to drop the counter
4588 * when releasing a resource needing all multicasts.
4589 * Return 0 if successful or a negative errno code on error.
4592 int dev_set_allmulti(struct net_device *dev, int inc)
4594 unsigned short old_flags = dev->flags;
4598 dev->flags |= IFF_ALLMULTI;
4599 dev->allmulti += inc;
4600 if (dev->allmulti == 0) {
4603 * If inc causes overflow, untouch allmulti and return error.
4606 dev->flags &= ~IFF_ALLMULTI;
4608 dev->allmulti -= inc;
4609 printk(KERN_WARNING "%s: allmulti touches roof, "
4610 "set allmulti failed, allmulti feature of "
4611 "device might be broken.\n", dev->name);
4615 if (dev->flags ^ old_flags) {
4616 dev_change_rx_flags(dev, IFF_ALLMULTI);
4617 dev_set_rx_mode(dev);
4621 EXPORT_SYMBOL(dev_set_allmulti);
4624 * Upload unicast and multicast address lists to device and
4625 * configure RX filtering. When the device doesn't support unicast
4626 * filtering it is put in promiscuous mode while unicast addresses
4629 void __dev_set_rx_mode(struct net_device *dev)
4631 const struct net_device_ops *ops = dev->netdev_ops;
4633 /* dev_open will call this function so the list will stay sane. */
4634 if (!(dev->flags&IFF_UP))
4637 if (!netif_device_present(dev))
4640 if (!(dev->priv_flags & IFF_UNICAST_FLT)) {
4641 /* Unicast addresses changes may only happen under the rtnl,
4642 * therefore calling __dev_set_promiscuity here is safe.
4644 if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
4645 __dev_set_promiscuity(dev, 1);
4646 dev->uc_promisc = true;
4647 } else if (netdev_uc_empty(dev) && dev->uc_promisc) {
4648 __dev_set_promiscuity(dev, -1);
4649 dev->uc_promisc = false;
4653 if (ops->ndo_set_rx_mode)
4654 ops->ndo_set_rx_mode(dev);
4657 void dev_set_rx_mode(struct net_device *dev)
4659 netif_addr_lock_bh(dev);
4660 __dev_set_rx_mode(dev);
4661 netif_addr_unlock_bh(dev);
4665 * dev_get_flags - get flags reported to userspace
4668 * Get the combination of flag bits exported through APIs to userspace.
4670 unsigned dev_get_flags(const struct net_device *dev)
4674 flags = (dev->flags & ~(IFF_PROMISC |
4679 (dev->gflags & (IFF_PROMISC |
4682 if (netif_running(dev)) {
4683 if (netif_oper_up(dev))
4684 flags |= IFF_RUNNING;
4685 if (netif_carrier_ok(dev))
4686 flags |= IFF_LOWER_UP;
4687 if (netif_dormant(dev))
4688 flags |= IFF_DORMANT;
4693 EXPORT_SYMBOL(dev_get_flags);
4695 int __dev_change_flags(struct net_device *dev, unsigned int flags)
4697 int old_flags = dev->flags;
4703 * Set the flags on our device.
4706 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
4707 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
4709 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
4713 * Load in the correct multicast list now the flags have changed.
4716 if ((old_flags ^ flags) & IFF_MULTICAST)
4717 dev_change_rx_flags(dev, IFF_MULTICAST);
4719 dev_set_rx_mode(dev);
4722 * Have we downed the interface. We handle IFF_UP ourselves
4723 * according to user attempts to set it, rather than blindly
4728 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
4729 ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev);
4732 dev_set_rx_mode(dev);
4735 if ((flags ^ dev->gflags) & IFF_PROMISC) {
4736 int inc = (flags & IFF_PROMISC) ? 1 : -1;
4738 dev->gflags ^= IFF_PROMISC;
4739 dev_set_promiscuity(dev, inc);
4742 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
4743 is important. Some (broken) drivers set IFF_PROMISC, when
4744 IFF_ALLMULTI is requested not asking us and not reporting.
4746 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
4747 int inc = (flags & IFF_ALLMULTI) ? 1 : -1;
4749 dev->gflags ^= IFF_ALLMULTI;
4750 dev_set_allmulti(dev, inc);
4756 void __dev_notify_flags(struct net_device *dev, unsigned int old_flags)
4758 unsigned int changes = dev->flags ^ old_flags;
4760 if (changes & IFF_UP) {
4761 if (dev->flags & IFF_UP)
4762 call_netdevice_notifiers(NETDEV_UP, dev);
4764 call_netdevice_notifiers(NETDEV_DOWN, dev);
4767 if (dev->flags & IFF_UP &&
4768 (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE)))
4769 call_netdevice_notifiers(NETDEV_CHANGE, dev);
4773 * dev_change_flags - change device settings
4775 * @flags: device state flags
4777 * Change settings on device based state flags. The flags are
4778 * in the userspace exported format.
4780 int dev_change_flags(struct net_device *dev, unsigned flags)
4783 int old_flags = dev->flags;
4785 ret = __dev_change_flags(dev, flags);
4789 changes = old_flags ^ dev->flags;
4791 rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
4793 __dev_notify_flags(dev, old_flags);
4796 EXPORT_SYMBOL(dev_change_flags);
4799 * dev_set_mtu - Change maximum transfer unit
4801 * @new_mtu: new transfer unit
4803 * Change the maximum transfer size of the network device.
4805 int dev_set_mtu(struct net_device *dev, int new_mtu)
4807 const struct net_device_ops *ops = dev->netdev_ops;
4810 if (new_mtu == dev->mtu)
4813 /* MTU must be positive. */
4817 if (!netif_device_present(dev))
4821 if (ops->ndo_change_mtu)
4822 err = ops->ndo_change_mtu(dev, new_mtu);
4826 if (!err && dev->flags & IFF_UP)
4827 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
4830 EXPORT_SYMBOL(dev_set_mtu);
4833 * dev_set_group - Change group this device belongs to
4835 * @new_group: group this device should belong to
4837 void dev_set_group(struct net_device *dev, int new_group)
4839 dev->group = new_group;
4841 EXPORT_SYMBOL(dev_set_group);
4844 * dev_set_mac_address - Change Media Access Control Address
4848 * Change the hardware (MAC) address of the device
4850 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
4852 const struct net_device_ops *ops = dev->netdev_ops;
4855 if (!ops->ndo_set_mac_address)
4857 if (sa->sa_family != dev->type)
4859 if (!netif_device_present(dev))
4861 err = ops->ndo_set_mac_address(dev, sa);
4863 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4864 add_device_randomness(dev->dev_addr, dev->addr_len);
4867 EXPORT_SYMBOL(dev_set_mac_address);
4870 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
4872 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
4875 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
4881 case SIOCGIFFLAGS: /* Get interface flags */
4882 ifr->ifr_flags = (short) dev_get_flags(dev);
4885 case SIOCGIFMETRIC: /* Get the metric on the interface
4886 (currently unused) */
4887 ifr->ifr_metric = 0;
4890 case SIOCGIFMTU: /* Get the MTU of a device */
4891 ifr->ifr_mtu = dev->mtu;
4896 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
4898 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
4899 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4900 ifr->ifr_hwaddr.sa_family = dev->type;
4908 ifr->ifr_map.mem_start = dev->mem_start;
4909 ifr->ifr_map.mem_end = dev->mem_end;
4910 ifr->ifr_map.base_addr = dev->base_addr;
4911 ifr->ifr_map.irq = dev->irq;
4912 ifr->ifr_map.dma = dev->dma;
4913 ifr->ifr_map.port = dev->if_port;
4917 ifr->ifr_ifindex = dev->ifindex;
4921 ifr->ifr_qlen = dev->tx_queue_len;
4925 /* dev_ioctl() should ensure this case
4937 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
4939 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
4942 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
4943 const struct net_device_ops *ops;
4948 ops = dev->netdev_ops;
4951 case SIOCSIFFLAGS: /* Set interface flags */
4952 return dev_change_flags(dev, ifr->ifr_flags);
4954 case SIOCSIFMETRIC: /* Set the metric on the interface
4955 (currently unused) */
4958 case SIOCSIFMTU: /* Set the MTU of a device */
4959 return dev_set_mtu(dev, ifr->ifr_mtu);
4962 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
4964 case SIOCSIFHWBROADCAST:
4965 if (ifr->ifr_hwaddr.sa_family != dev->type)
4967 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
4968 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4969 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4973 if (ops->ndo_set_config) {
4974 if (!netif_device_present(dev))
4976 return ops->ndo_set_config(dev, &ifr->ifr_map);
4981 if (!ops->ndo_set_rx_mode ||
4982 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4984 if (!netif_device_present(dev))
4986 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
4989 if (!ops->ndo_set_rx_mode ||
4990 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4992 if (!netif_device_present(dev))
4994 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
4997 if (ifr->ifr_qlen < 0)
4999 dev->tx_queue_len = ifr->ifr_qlen;
5003 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
5004 return dev_change_name(dev, ifr->ifr_newname);
5007 err = net_hwtstamp_validate(ifr);
5013 * Unknown or private ioctl
5016 if ((cmd >= SIOCDEVPRIVATE &&
5017 cmd <= SIOCDEVPRIVATE + 15) ||
5018 cmd == SIOCBONDENSLAVE ||
5019 cmd == SIOCBONDRELEASE ||
5020 cmd == SIOCBONDSETHWADDR ||
5021 cmd == SIOCBONDSLAVEINFOQUERY ||
5022 cmd == SIOCBONDINFOQUERY ||
5023 cmd == SIOCBONDCHANGEACTIVE ||
5024 cmd == SIOCGMIIPHY ||
5025 cmd == SIOCGMIIREG ||
5026 cmd == SIOCSMIIREG ||
5027 cmd == SIOCBRADDIF ||
5028 cmd == SIOCBRDELIF ||
5029 cmd == SIOCSHWTSTAMP ||
5030 cmd == SIOCWANDEV) {
5032 if (ops->ndo_do_ioctl) {
5033 if (netif_device_present(dev))
5034 err = ops->ndo_do_ioctl(dev, ifr, cmd);
5046 * This function handles all "interface"-type I/O control requests. The actual
5047 * 'doing' part of this is dev_ifsioc above.
5051 * dev_ioctl - network device ioctl
5052 * @net: the applicable net namespace
5053 * @cmd: command to issue
5054 * @arg: pointer to a struct ifreq in user space
5056 * Issue ioctl functions to devices. This is normally called by the
5057 * user space syscall interfaces but can sometimes be useful for
5058 * other purposes. The return value is the return from the syscall if
5059 * positive or a negative errno code on error.
5062 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
5068 /* One special case: SIOCGIFCONF takes ifconf argument
5069 and requires shared lock, because it sleeps writing
5073 if (cmd == SIOCGIFCONF) {
5075 ret = dev_ifconf(net, (char __user *) arg);
5079 if (cmd == SIOCGIFNAME)
5080 return dev_ifname(net, (struct ifreq __user *)arg);
5082 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
5085 ifr.ifr_name[IFNAMSIZ-1] = 0;
5087 colon = strchr(ifr.ifr_name, ':');
5092 * See which interface the caller is talking about.
5097 * These ioctl calls:
5098 * - can be done by all.
5099 * - atomic and do not require locking.
5110 dev_load(net, ifr.ifr_name);
5112 ret = dev_ifsioc_locked(net, &ifr, cmd);
5117 if (copy_to_user(arg, &ifr,
5118 sizeof(struct ifreq)))
5124 dev_load(net, ifr.ifr_name);
5126 ret = dev_ethtool(net, &ifr);
5131 if (copy_to_user(arg, &ifr,
5132 sizeof(struct ifreq)))
5138 * These ioctl calls:
5139 * - require superuser power.
5140 * - require strict serialization.
5146 if (!capable(CAP_NET_ADMIN))
5148 dev_load(net, ifr.ifr_name);
5150 ret = dev_ifsioc(net, &ifr, cmd);
5155 if (copy_to_user(arg, &ifr,
5156 sizeof(struct ifreq)))
5162 * These ioctl calls:
5163 * - require superuser power.
5164 * - require strict serialization.
5165 * - do not return a value
5175 case SIOCSIFHWBROADCAST:
5178 case SIOCBONDENSLAVE:
5179 case SIOCBONDRELEASE:
5180 case SIOCBONDSETHWADDR:
5181 case SIOCBONDCHANGEACTIVE:
5185 if (!capable(CAP_NET_ADMIN))
5188 case SIOCBONDSLAVEINFOQUERY:
5189 case SIOCBONDINFOQUERY:
5190 dev_load(net, ifr.ifr_name);
5192 ret = dev_ifsioc(net, &ifr, cmd);
5197 /* Get the per device memory space. We can add this but
5198 * currently do not support it */
5200 /* Set the per device memory buffer space.
5201 * Not applicable in our case */
5206 * Unknown or private ioctl.
5209 if (cmd == SIOCWANDEV ||
5210 (cmd >= SIOCDEVPRIVATE &&
5211 cmd <= SIOCDEVPRIVATE + 15)) {
5212 dev_load(net, ifr.ifr_name);
5214 ret = dev_ifsioc(net, &ifr, cmd);
5216 if (!ret && copy_to_user(arg, &ifr,
5217 sizeof(struct ifreq)))
5221 /* Take care of Wireless Extensions */
5222 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
5223 return wext_handle_ioctl(net, &ifr, cmd, arg);
5230 * dev_new_index - allocate an ifindex
5231 * @net: the applicable net namespace
5233 * Returns a suitable unique value for a new device interface
5234 * number. The caller must hold the rtnl semaphore or the
5235 * dev_base_lock to be sure it remains unique.
5237 static int dev_new_index(struct net *net)
5243 if (!__dev_get_by_index(net, ifindex))
5248 /* Delayed registration/unregisteration */
5249 static LIST_HEAD(net_todo_list);
5251 static void net_set_todo(struct net_device *dev)
5253 list_add_tail(&dev->todo_list, &net_todo_list);
5256 static void rollback_registered_many(struct list_head *head)
5258 struct net_device *dev, *tmp;
5260 BUG_ON(dev_boot_phase);
5263 list_for_each_entry_safe(dev, tmp, head, unreg_list) {
5264 /* Some devices call without registering
5265 * for initialization unwind. Remove those
5266 * devices and proceed with the remaining.
5268 if (dev->reg_state == NETREG_UNINITIALIZED) {
5269 pr_debug("unregister_netdevice: device %s/%p never "
5270 "was registered\n", dev->name, dev);
5273 list_del(&dev->unreg_list);
5276 dev->dismantle = true;
5277 BUG_ON(dev->reg_state != NETREG_REGISTERED);
5280 /* If device is running, close it first. */
5281 dev_close_many(head);
5283 list_for_each_entry(dev, head, unreg_list) {
5284 /* And unlink it from device chain. */
5285 unlist_netdevice(dev);
5287 dev->reg_state = NETREG_UNREGISTERING;
5292 list_for_each_entry(dev, head, unreg_list) {
5293 /* Shutdown queueing discipline. */
5297 /* Notify protocols, that we are about to destroy
5298 this device. They should clean all the things.
5300 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5302 if (!dev->rtnl_link_ops ||
5303 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
5304 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
5307 * Flush the unicast and multicast chains
5312 if (dev->netdev_ops->ndo_uninit)
5313 dev->netdev_ops->ndo_uninit(dev);
5315 /* Notifier chain MUST detach us from master device. */
5316 WARN_ON(dev->master);
5318 /* Remove entries from kobject tree */
5319 netdev_unregister_kobject(dev);
5322 /* Process any work delayed until the end of the batch */
5323 dev = list_first_entry(head, struct net_device, unreg_list);
5324 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
5328 list_for_each_entry(dev, head, unreg_list)
5332 static void rollback_registered(struct net_device *dev)
5336 list_add(&dev->unreg_list, &single);
5337 rollback_registered_many(&single);
5341 static u32 netdev_fix_features(struct net_device *dev, u32 features)
5343 /* Fix illegal checksum combinations */
5344 if ((features & NETIF_F_HW_CSUM) &&
5345 (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5346 netdev_warn(dev, "mixed HW and IP checksum settings.\n");
5347 features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
5350 if ((features & NETIF_F_NO_CSUM) &&
5351 (features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5352 netdev_warn(dev, "mixed no checksumming and other settings.\n");
5353 features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
5356 /* Fix illegal SG+CSUM combinations. */
5357 if ((features & NETIF_F_SG) &&
5358 !(features & NETIF_F_ALL_CSUM)) {
5360 "Dropping NETIF_F_SG since no checksum feature.\n");
5361 features &= ~NETIF_F_SG;
5364 /* TSO requires that SG is present as well. */
5365 if ((features & NETIF_F_ALL_TSO) && !(features & NETIF_F_SG)) {
5366 netdev_dbg(dev, "Dropping TSO features since no SG feature.\n");
5367 features &= ~NETIF_F_ALL_TSO;
5370 /* TSO ECN requires that TSO is present as well. */
5371 if ((features & NETIF_F_ALL_TSO) == NETIF_F_TSO_ECN)
5372 features &= ~NETIF_F_TSO_ECN;
5374 /* Software GSO depends on SG. */
5375 if ((features & NETIF_F_GSO) && !(features & NETIF_F_SG)) {
5376 netdev_dbg(dev, "Dropping NETIF_F_GSO since no SG feature.\n");
5377 features &= ~NETIF_F_GSO;
5380 /* UFO needs SG and checksumming */
5381 if (features & NETIF_F_UFO) {
5382 /* maybe split UFO into V4 and V6? */
5383 if (!((features & NETIF_F_GEN_CSUM) ||
5384 (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))
5385 == (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5387 "Dropping NETIF_F_UFO since no checksum offload features.\n");
5388 features &= ~NETIF_F_UFO;
5391 if (!(features & NETIF_F_SG)) {
5393 "Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n");
5394 features &= ~NETIF_F_UFO;
5401 int __netdev_update_features(struct net_device *dev)
5408 features = netdev_get_wanted_features(dev);
5410 if (dev->netdev_ops->ndo_fix_features)
5411 features = dev->netdev_ops->ndo_fix_features(dev, features);
5413 /* driver might be less strict about feature dependencies */
5414 features = netdev_fix_features(dev, features);
5416 if (dev->features == features)
5419 netdev_dbg(dev, "Features changed: 0x%08x -> 0x%08x\n",
5420 dev->features, features);
5422 if (dev->netdev_ops->ndo_set_features)
5423 err = dev->netdev_ops->ndo_set_features(dev, features);
5425 if (unlikely(err < 0)) {
5427 "set_features() failed (%d); wanted 0x%08x, left 0x%08x\n",
5428 err, features, dev->features);
5433 dev->features = features;
5439 * netdev_update_features - recalculate device features
5440 * @dev: the device to check
5442 * Recalculate dev->features set and send notifications if it
5443 * has changed. Should be called after driver or hardware dependent
5444 * conditions might have changed that influence the features.
5446 void netdev_update_features(struct net_device *dev)
5448 if (__netdev_update_features(dev))
5449 netdev_features_change(dev);
5451 EXPORT_SYMBOL(netdev_update_features);
5454 * netdev_change_features - recalculate device features
5455 * @dev: the device to check
5457 * Recalculate dev->features set and send notifications even
5458 * if they have not changed. Should be called instead of
5459 * netdev_update_features() if also dev->vlan_features might
5460 * have changed to allow the changes to be propagated to stacked
5463 void netdev_change_features(struct net_device *dev)
5465 __netdev_update_features(dev);
5466 netdev_features_change(dev);
5468 EXPORT_SYMBOL(netdev_change_features);
5471 * netif_stacked_transfer_operstate - transfer operstate
5472 * @rootdev: the root or lower level device to transfer state from
5473 * @dev: the device to transfer operstate to
5475 * Transfer operational state from root to device. This is normally
5476 * called when a stacking relationship exists between the root
5477 * device and the device(a leaf device).
5479 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
5480 struct net_device *dev)
5482 if (rootdev->operstate == IF_OPER_DORMANT)
5483 netif_dormant_on(dev);
5485 netif_dormant_off(dev);
5487 if (netif_carrier_ok(rootdev)) {
5488 if (!netif_carrier_ok(dev))
5489 netif_carrier_on(dev);
5491 if (netif_carrier_ok(dev))
5492 netif_carrier_off(dev);
5495 EXPORT_SYMBOL(netif_stacked_transfer_operstate);
5498 static int netif_alloc_rx_queues(struct net_device *dev)
5500 unsigned int i, count = dev->num_rx_queues;
5501 struct netdev_rx_queue *rx;
5505 rx = kcalloc(count, sizeof(struct netdev_rx_queue), GFP_KERNEL);
5507 pr_err("netdev: Unable to allocate %u rx queues.\n", count);
5512 for (i = 0; i < count; i++)
5518 static void netdev_init_one_queue(struct net_device *dev,
5519 struct netdev_queue *queue, void *_unused)
5521 /* Initialize queue lock */
5522 spin_lock_init(&queue->_xmit_lock);
5523 netdev_set_xmit_lockdep_class(&queue->_xmit_lock, dev->type);
5524 queue->xmit_lock_owner = -1;
5525 netdev_queue_numa_node_write(queue, NUMA_NO_NODE);
5529 static int netif_alloc_netdev_queues(struct net_device *dev)
5531 unsigned int count = dev->num_tx_queues;
5532 struct netdev_queue *tx;
5536 tx = kcalloc(count, sizeof(struct netdev_queue), GFP_KERNEL);
5538 pr_err("netdev: Unable to allocate %u tx queues.\n",
5544 netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
5545 spin_lock_init(&dev->tx_global_lock);
5551 * register_netdevice - register a network device
5552 * @dev: device to register
5554 * Take a completed network device structure and add it to the kernel
5555 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5556 * chain. 0 is returned on success. A negative errno code is returned
5557 * on a failure to set up the device, or if the name is a duplicate.
5559 * Callers must hold the rtnl semaphore. You may want
5560 * register_netdev() instead of this.
5563 * The locking appears insufficient to guarantee two parallel registers
5564 * will not get the same name.
5567 int register_netdevice(struct net_device *dev)
5570 struct net *net = dev_net(dev);
5572 BUG_ON(dev_boot_phase);
5577 /* When net_device's are persistent, this will be fatal. */
5578 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
5581 spin_lock_init(&dev->addr_list_lock);
5582 netdev_set_addr_lockdep_class(dev);
5586 ret = dev_get_valid_name(dev, dev->name);
5590 /* Init, if this function is available */
5591 if (dev->netdev_ops->ndo_init) {
5592 ret = dev->netdev_ops->ndo_init(dev);
5600 dev->ifindex = dev_new_index(net);
5601 if (dev->iflink == -1)
5602 dev->iflink = dev->ifindex;
5604 /* Transfer changeable features to wanted_features and enable
5605 * software offloads (GSO and GRO).
5607 dev->hw_features |= NETIF_F_SOFT_FEATURES;
5608 dev->features |= NETIF_F_SOFT_FEATURES;
5609 dev->wanted_features = dev->features & dev->hw_features;
5611 /* Turn on no cache copy if HW is doing checksum */
5612 dev->hw_features |= NETIF_F_NOCACHE_COPY;
5613 if ((dev->features & NETIF_F_ALL_CSUM) &&
5614 !(dev->features & NETIF_F_NO_CSUM)) {
5615 dev->wanted_features |= NETIF_F_NOCACHE_COPY;
5616 dev->features |= NETIF_F_NOCACHE_COPY;
5619 /* Make NETIF_F_HIGHDMA inheritable to VLAN devices.
5621 dev->vlan_features |= NETIF_F_HIGHDMA;
5623 ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
5624 ret = notifier_to_errno(ret);
5628 ret = netdev_register_kobject(dev);
5631 dev->reg_state = NETREG_REGISTERED;
5633 __netdev_update_features(dev);
5636 * Default initial state at registry is that the
5637 * device is present.
5640 set_bit(__LINK_STATE_PRESENT, &dev->state);
5642 dev_init_scheduler(dev);
5644 list_netdevice(dev);
5645 add_device_randomness(dev->dev_addr, dev->addr_len);
5647 /* Notify protocols, that a new device appeared. */
5648 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
5649 ret = notifier_to_errno(ret);
5651 rollback_registered(dev);
5652 dev->reg_state = NETREG_UNREGISTERED;
5655 * Prevent userspace races by waiting until the network
5656 * device is fully setup before sending notifications.
5658 if (!dev->rtnl_link_ops ||
5659 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
5660 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
5666 if (dev->netdev_ops->ndo_uninit)
5667 dev->netdev_ops->ndo_uninit(dev);
5670 EXPORT_SYMBOL(register_netdevice);
5673 * init_dummy_netdev - init a dummy network device for NAPI
5674 * @dev: device to init
5676 * This takes a network device structure and initialize the minimum
5677 * amount of fields so it can be used to schedule NAPI polls without
5678 * registering a full blown interface. This is to be used by drivers
5679 * that need to tie several hardware interfaces to a single NAPI
5680 * poll scheduler due to HW limitations.
5682 int init_dummy_netdev(struct net_device *dev)
5684 /* Clear everything. Note we don't initialize spinlocks
5685 * are they aren't supposed to be taken by any of the
5686 * NAPI code and this dummy netdev is supposed to be
5687 * only ever used for NAPI polls
5689 memset(dev, 0, sizeof(struct net_device));
5691 /* make sure we BUG if trying to hit standard
5692 * register/unregister code path
5694 dev->reg_state = NETREG_DUMMY;
5696 /* NAPI wants this */
5697 INIT_LIST_HEAD(&dev->napi_list);
5699 /* a dummy interface is started by default */
5700 set_bit(__LINK_STATE_PRESENT, &dev->state);
5701 set_bit(__LINK_STATE_START, &dev->state);
5703 /* Note : We dont allocate pcpu_refcnt for dummy devices,
5704 * because users of this 'device' dont need to change
5710 EXPORT_SYMBOL_GPL(init_dummy_netdev);
5714 * register_netdev - register a network device
5715 * @dev: device to register
5717 * Take a completed network device structure and add it to the kernel
5718 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5719 * chain. 0 is returned on success. A negative errno code is returned
5720 * on a failure to set up the device, or if the name is a duplicate.
5722 * This is a wrapper around register_netdevice that takes the rtnl semaphore
5723 * and expands the device name if you passed a format string to
5726 int register_netdev(struct net_device *dev)
5731 err = register_netdevice(dev);
5735 EXPORT_SYMBOL(register_netdev);
5737 int netdev_refcnt_read(const struct net_device *dev)
5741 for_each_possible_cpu(i)
5742 refcnt += *per_cpu_ptr(dev->pcpu_refcnt, i);
5745 EXPORT_SYMBOL(netdev_refcnt_read);
5748 * netdev_wait_allrefs - wait until all references are gone.
5750 * This is called when unregistering network devices.
5752 * Any protocol or device that holds a reference should register
5753 * for netdevice notification, and cleanup and put back the
5754 * reference if they receive an UNREGISTER event.
5755 * We can get stuck here if buggy protocols don't correctly
5758 static void netdev_wait_allrefs(struct net_device *dev)
5760 unsigned long rebroadcast_time, warning_time;
5763 linkwatch_forget_dev(dev);
5765 rebroadcast_time = warning_time = jiffies;
5766 refcnt = netdev_refcnt_read(dev);
5768 while (refcnt != 0) {
5769 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
5772 /* Rebroadcast unregister notification */
5773 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5774 /* don't resend NETDEV_UNREGISTER_BATCH, _BATCH users
5775 * should have already handle it the first time */
5777 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
5779 /* We must not have linkwatch events
5780 * pending on unregister. If this
5781 * happens, we simply run the queue
5782 * unscheduled, resulting in a noop
5785 linkwatch_run_queue();
5790 rebroadcast_time = jiffies;
5795 refcnt = netdev_refcnt_read(dev);
5797 if (time_after(jiffies, warning_time + 10 * HZ)) {
5798 printk(KERN_EMERG "unregister_netdevice: "
5799 "waiting for %s to become free. Usage "
5802 warning_time = jiffies;
5811 * register_netdevice(x1);
5812 * register_netdevice(x2);
5814 * unregister_netdevice(y1);
5815 * unregister_netdevice(y2);
5821 * We are invoked by rtnl_unlock().
5822 * This allows us to deal with problems:
5823 * 1) We can delete sysfs objects which invoke hotplug
5824 * without deadlocking with linkwatch via keventd.
5825 * 2) Since we run with the RTNL semaphore not held, we can sleep
5826 * safely in order to wait for the netdev refcnt to drop to zero.
5828 * We must not return until all unregister events added during
5829 * the interval the lock was held have been completed.
5831 void netdev_run_todo(void)
5833 struct list_head list;
5835 /* Snapshot list, allow later requests */
5836 list_replace_init(&net_todo_list, &list);
5840 /* Wait for rcu callbacks to finish before attempting to drain
5841 * the device list. This usually avoids a 250ms wait.
5843 if (!list_empty(&list))
5846 while (!list_empty(&list)) {
5847 struct net_device *dev
5848 = list_first_entry(&list, struct net_device, todo_list);
5849 list_del(&dev->todo_list);
5851 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
5852 printk(KERN_ERR "network todo '%s' but state %d\n",
5853 dev->name, dev->reg_state);
5858 dev->reg_state = NETREG_UNREGISTERED;
5860 on_each_cpu(flush_backlog, dev, 1);
5862 netdev_wait_allrefs(dev);
5865 BUG_ON(netdev_refcnt_read(dev));
5866 WARN_ON(rcu_access_pointer(dev->ip_ptr));
5867 WARN_ON(rcu_access_pointer(dev->ip6_ptr));
5868 WARN_ON(dev->dn_ptr);
5870 if (dev->destructor)
5871 dev->destructor(dev);
5873 /* Free network device */
5874 kobject_put(&dev->dev.kobj);
5878 /* Convert net_device_stats to rtnl_link_stats64. They have the same
5879 * fields in the same order, with only the type differing.
5881 static void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
5882 const struct net_device_stats *netdev_stats)
5884 #if BITS_PER_LONG == 64
5885 BUILD_BUG_ON(sizeof(*stats64) != sizeof(*netdev_stats));
5886 memcpy(stats64, netdev_stats, sizeof(*stats64));
5888 size_t i, n = sizeof(*stats64) / sizeof(u64);
5889 const unsigned long *src = (const unsigned long *)netdev_stats;
5890 u64 *dst = (u64 *)stats64;
5892 BUILD_BUG_ON(sizeof(*netdev_stats) / sizeof(unsigned long) !=
5893 sizeof(*stats64) / sizeof(u64));
5894 for (i = 0; i < n; i++)
5900 * dev_get_stats - get network device statistics
5901 * @dev: device to get statistics from
5902 * @storage: place to store stats
5904 * Get network statistics from device. Return @storage.
5905 * The device driver may provide its own method by setting
5906 * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
5907 * otherwise the internal statistics structure is used.
5909 struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
5910 struct rtnl_link_stats64 *storage)
5912 const struct net_device_ops *ops = dev->netdev_ops;
5914 if (ops->ndo_get_stats64) {
5915 memset(storage, 0, sizeof(*storage));
5916 ops->ndo_get_stats64(dev, storage);
5917 } else if (ops->ndo_get_stats) {
5918 netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev));
5920 netdev_stats_to_stats64(storage, &dev->stats);
5922 storage->rx_dropped += atomic_long_read(&dev->rx_dropped);
5925 EXPORT_SYMBOL(dev_get_stats);
5927 struct netdev_queue *dev_ingress_queue_create(struct net_device *dev)
5929 struct netdev_queue *queue = dev_ingress_queue(dev);
5931 #ifdef CONFIG_NET_CLS_ACT
5934 queue = kzalloc(sizeof(*queue), GFP_KERNEL);
5937 netdev_init_one_queue(dev, queue, NULL);
5938 queue->qdisc = &noop_qdisc;
5939 queue->qdisc_sleeping = &noop_qdisc;
5940 rcu_assign_pointer(dev->ingress_queue, queue);
5946 * alloc_netdev_mqs - allocate network device
5947 * @sizeof_priv: size of private data to allocate space for
5948 * @name: device name format string
5949 * @setup: callback to initialize device
5950 * @txqs: the number of TX subqueues to allocate
5951 * @rxqs: the number of RX subqueues to allocate
5953 * Allocates a struct net_device with private data area for driver use
5954 * and performs basic initialization. Also allocates subquue structs
5955 * for each queue on the device.
5957 struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
5958 void (*setup)(struct net_device *),
5959 unsigned int txqs, unsigned int rxqs)
5961 struct net_device *dev;
5963 struct net_device *p;
5965 BUG_ON(strlen(name) >= sizeof(dev->name));
5968 pr_err("alloc_netdev: Unable to allocate device "
5969 "with zero queues.\n");
5975 pr_err("alloc_netdev: Unable to allocate device "
5976 "with zero RX queues.\n");
5981 alloc_size = sizeof(struct net_device);
5983 /* ensure 32-byte alignment of private area */
5984 alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
5985 alloc_size += sizeof_priv;
5987 /* ensure 32-byte alignment of whole construct */
5988 alloc_size += NETDEV_ALIGN - 1;
5990 p = kzalloc(alloc_size, GFP_KERNEL);
5992 printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
5996 dev = PTR_ALIGN(p, NETDEV_ALIGN);
5997 dev->padded = (char *)dev - (char *)p;
5999 dev->pcpu_refcnt = alloc_percpu(int);
6000 if (!dev->pcpu_refcnt)
6003 if (dev_addr_init(dev))
6009 dev_net_set(dev, &init_net);
6011 dev->gso_max_size = GSO_MAX_SIZE;
6012 dev->gso_max_segs = GSO_MAX_SEGS;
6014 INIT_LIST_HEAD(&dev->napi_list);
6015 INIT_LIST_HEAD(&dev->unreg_list);
6016 INIT_LIST_HEAD(&dev->link_watch_list);
6017 dev->priv_flags = IFF_XMIT_DST_RELEASE;
6020 dev->num_tx_queues = txqs;
6021 dev->real_num_tx_queues = txqs;
6022 if (netif_alloc_netdev_queues(dev))
6026 dev->num_rx_queues = rxqs;
6027 dev->real_num_rx_queues = rxqs;
6028 if (netif_alloc_rx_queues(dev))
6032 strcpy(dev->name, name);
6033 dev->group = INIT_NETDEV_GROUP;
6041 free_percpu(dev->pcpu_refcnt);
6051 EXPORT_SYMBOL(alloc_netdev_mqs);
6054 * free_netdev - free network device
6057 * This function does the last stage of destroying an allocated device
6058 * interface. The reference to the device object is released.
6059 * If this is the last reference then it will be freed.
6061 void free_netdev(struct net_device *dev)
6063 struct napi_struct *p, *n;
6065 release_net(dev_net(dev));
6072 kfree(rcu_dereference_protected(dev->ingress_queue, 1));
6074 /* Flush device addresses */
6075 dev_addr_flush(dev);
6077 list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
6080 free_percpu(dev->pcpu_refcnt);
6081 dev->pcpu_refcnt = NULL;
6083 /* Compatibility with error handling in drivers */
6084 if (dev->reg_state == NETREG_UNINITIALIZED) {
6085 kfree((char *)dev - dev->padded);
6089 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
6090 dev->reg_state = NETREG_RELEASED;
6092 /* will free via device release */
6093 put_device(&dev->dev);
6095 EXPORT_SYMBOL(free_netdev);
6098 * synchronize_net - Synchronize with packet receive processing
6100 * Wait for packets currently being received to be done.
6101 * Does not block later packets from starting.
6103 void synchronize_net(void)
6106 if (rtnl_is_locked())
6107 synchronize_rcu_expedited();
6111 EXPORT_SYMBOL(synchronize_net);
6114 * unregister_netdevice_queue - remove device from the kernel
6118 * This function shuts down a device interface and removes it
6119 * from the kernel tables.
6120 * If head not NULL, device is queued to be unregistered later.
6122 * Callers must hold the rtnl semaphore. You may want
6123 * unregister_netdev() instead of this.
6126 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
6131 list_move_tail(&dev->unreg_list, head);
6133 rollback_registered(dev);
6134 /* Finish processing unregister after unlock */
6138 EXPORT_SYMBOL(unregister_netdevice_queue);
6141 * unregister_netdevice_many - unregister many devices
6142 * @head: list of devices
6144 void unregister_netdevice_many(struct list_head *head)
6146 struct net_device *dev;
6148 if (!list_empty(head)) {
6149 rollback_registered_many(head);
6150 list_for_each_entry(dev, head, unreg_list)
6154 EXPORT_SYMBOL(unregister_netdevice_many);
6157 * unregister_netdev - remove device from the kernel
6160 * This function shuts down a device interface and removes it
6161 * from the kernel tables.
6163 * This is just a wrapper for unregister_netdevice that takes
6164 * the rtnl semaphore. In general you want to use this and not
6165 * unregister_netdevice.
6167 void unregister_netdev(struct net_device *dev)
6170 unregister_netdevice(dev);
6173 EXPORT_SYMBOL(unregister_netdev);
6176 * dev_change_net_namespace - move device to different nethost namespace
6178 * @net: network namespace
6179 * @pat: If not NULL name pattern to try if the current device name
6180 * is already taken in the destination network namespace.
6182 * This function shuts down a device interface and moves it
6183 * to a new network namespace. On success 0 is returned, on
6184 * a failure a netagive errno code is returned.
6186 * Callers must hold the rtnl semaphore.
6189 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
6195 /* Don't allow namespace local devices to be moved. */
6197 if (dev->features & NETIF_F_NETNS_LOCAL)
6200 /* Ensure the device has been registrered */
6202 if (dev->reg_state != NETREG_REGISTERED)
6205 /* Get out if there is nothing todo */
6207 if (net_eq(dev_net(dev), net))
6210 /* Pick the destination device name, and ensure
6211 * we can use it in the destination network namespace.
6214 if (__dev_get_by_name(net, dev->name)) {
6215 /* We get here if we can't use the current device name */
6218 if (dev_get_valid_name(dev, pat) < 0)
6223 * And now a mini version of register_netdevice unregister_netdevice.
6226 /* If device is running close it first. */
6229 /* And unlink it from device chain */
6231 unlist_netdevice(dev);
6235 /* Shutdown queueing discipline. */
6238 /* Notify protocols, that we are about to destroy
6239 this device. They should clean all the things.
6241 Note that dev->reg_state stays at NETREG_REGISTERED.
6242 This is wanted because this way 8021q and macvlan know
6243 the device is just moving and can keep their slaves up.
6245 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
6246 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
6247 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
6250 * Flush the unicast and multicast chains
6255 /* Actually switch the network namespace */
6256 dev_net_set(dev, net);
6258 /* If there is an ifindex conflict assign a new one */
6259 if (__dev_get_by_index(net, dev->ifindex)) {
6260 int iflink = (dev->iflink == dev->ifindex);
6261 dev->ifindex = dev_new_index(net);
6263 dev->iflink = dev->ifindex;
6266 /* Fixup kobjects */
6267 err = device_rename(&dev->dev, dev->name);
6270 /* Add the device back in the hashes */
6271 list_netdevice(dev);
6273 /* Notify protocols, that a new device appeared. */
6274 call_netdevice_notifiers(NETDEV_REGISTER, dev);
6277 * Prevent userspace races by waiting until the network
6278 * device is fully setup before sending notifications.
6280 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
6287 EXPORT_SYMBOL_GPL(dev_change_net_namespace);
6289 static int dev_cpu_callback(struct notifier_block *nfb,
6290 unsigned long action,
6293 struct sk_buff **list_skb;
6294 struct sk_buff *skb;
6295 unsigned int cpu, oldcpu = (unsigned long)ocpu;
6296 struct softnet_data *sd, *oldsd;
6298 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
6301 local_irq_disable();
6302 cpu = smp_processor_id();
6303 sd = &per_cpu(softnet_data, cpu);
6304 oldsd = &per_cpu(softnet_data, oldcpu);
6306 /* Find end of our completion_queue. */
6307 list_skb = &sd->completion_queue;
6309 list_skb = &(*list_skb)->next;
6310 /* Append completion queue from offline CPU. */
6311 *list_skb = oldsd->completion_queue;
6312 oldsd->completion_queue = NULL;
6314 /* Append output queue from offline CPU. */
6315 if (oldsd->output_queue) {
6316 *sd->output_queue_tailp = oldsd->output_queue;
6317 sd->output_queue_tailp = oldsd->output_queue_tailp;
6318 oldsd->output_queue = NULL;
6319 oldsd->output_queue_tailp = &oldsd->output_queue;
6321 /* Append NAPI poll list from offline CPU. */
6322 if (!list_empty(&oldsd->poll_list)) {
6323 list_splice_init(&oldsd->poll_list, &sd->poll_list);
6324 raise_softirq_irqoff(NET_RX_SOFTIRQ);
6327 raise_softirq_irqoff(NET_TX_SOFTIRQ);
6330 /* Process offline CPU's input_pkt_queue */
6331 while ((skb = __skb_dequeue(&oldsd->process_queue))) {
6333 input_queue_head_incr(oldsd);
6335 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) {
6337 input_queue_head_incr(oldsd);
6345 * netdev_increment_features - increment feature set by one
6346 * @all: current feature set
6347 * @one: new feature set
6348 * @mask: mask feature set
6350 * Computes a new feature set after adding a device with feature set
6351 * @one to the master device with current feature set @all. Will not
6352 * enable anything that is off in @mask. Returns the new feature set.
6354 u32 netdev_increment_features(u32 all, u32 one, u32 mask)
6356 if (mask & NETIF_F_GEN_CSUM)
6357 mask |= NETIF_F_ALL_CSUM;
6358 mask |= NETIF_F_VLAN_CHALLENGED;
6360 all |= one & (NETIF_F_ONE_FOR_ALL|NETIF_F_ALL_CSUM) & mask;
6361 all &= one | ~NETIF_F_ALL_FOR_ALL;
6363 /* If device needs checksumming, downgrade to it. */
6364 if (all & (NETIF_F_ALL_CSUM & ~NETIF_F_NO_CSUM))
6365 all &= ~NETIF_F_NO_CSUM;
6367 /* If one device supports hw checksumming, set for all. */
6368 if (all & NETIF_F_GEN_CSUM)
6369 all &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_GEN_CSUM);
6373 EXPORT_SYMBOL(netdev_increment_features);
6375 static struct hlist_head *netdev_create_hash(void)
6378 struct hlist_head *hash;
6380 hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
6382 for (i = 0; i < NETDEV_HASHENTRIES; i++)
6383 INIT_HLIST_HEAD(&hash[i]);
6388 /* Initialize per network namespace state */
6389 static int __net_init netdev_init(struct net *net)
6391 if (net != &init_net)
6392 INIT_LIST_HEAD(&net->dev_base_head);
6394 net->dev_name_head = netdev_create_hash();
6395 if (net->dev_name_head == NULL)
6398 net->dev_index_head = netdev_create_hash();
6399 if (net->dev_index_head == NULL)
6405 kfree(net->dev_name_head);
6411 * netdev_drivername - network driver for the device
6412 * @dev: network device
6414 * Determine network driver for device.
6416 const char *netdev_drivername(const struct net_device *dev)
6418 const struct device_driver *driver;
6419 const struct device *parent;
6420 const char *empty = "";
6422 parent = dev->dev.parent;
6426 driver = parent->driver;
6427 if (driver && driver->name)
6428 return driver->name;
6432 int __netdev_printk(const char *level, const struct net_device *dev,
6433 struct va_format *vaf)
6437 if (dev && dev->dev.parent)
6438 r = dev_printk(level, dev->dev.parent, "%s: %pV",
6439 netdev_name(dev), vaf);
6441 r = printk("%s%s: %pV", level, netdev_name(dev), vaf);
6443 r = printk("%s(NULL net_device): %pV", level, vaf);
6447 EXPORT_SYMBOL(__netdev_printk);
6449 int netdev_printk(const char *level, const struct net_device *dev,
6450 const char *format, ...)
6452 struct va_format vaf;
6456 va_start(args, format);
6461 r = __netdev_printk(level, dev, &vaf);
6466 EXPORT_SYMBOL(netdev_printk);
6468 #define define_netdev_printk_level(func, level) \
6469 int func(const struct net_device *dev, const char *fmt, ...) \
6472 struct va_format vaf; \
6475 va_start(args, fmt); \
6480 r = __netdev_printk(level, dev, &vaf); \
6485 EXPORT_SYMBOL(func);
6487 define_netdev_printk_level(netdev_emerg, KERN_EMERG);
6488 define_netdev_printk_level(netdev_alert, KERN_ALERT);
6489 define_netdev_printk_level(netdev_crit, KERN_CRIT);
6490 define_netdev_printk_level(netdev_err, KERN_ERR);
6491 define_netdev_printk_level(netdev_warn, KERN_WARNING);
6492 define_netdev_printk_level(netdev_notice, KERN_NOTICE);
6493 define_netdev_printk_level(netdev_info, KERN_INFO);
6495 static void __net_exit netdev_exit(struct net *net)
6497 kfree(net->dev_name_head);
6498 kfree(net->dev_index_head);
6501 static struct pernet_operations __net_initdata netdev_net_ops = {
6502 .init = netdev_init,
6503 .exit = netdev_exit,
6506 static void __net_exit default_device_exit(struct net *net)
6508 struct net_device *dev, *aux;
6510 * Push all migratable network devices back to the
6511 * initial network namespace
6514 for_each_netdev_safe(net, dev, aux) {
6516 char fb_name[IFNAMSIZ];
6518 /* Ignore unmoveable devices (i.e. loopback) */
6519 if (dev->features & NETIF_F_NETNS_LOCAL)
6522 /* Leave virtual devices for the generic cleanup */
6523 if (dev->rtnl_link_ops)
6526 /* Push remaining network devices to init_net */
6527 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
6528 err = dev_change_net_namespace(dev, &init_net, fb_name);
6530 printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
6531 __func__, dev->name, err);
6538 static void __net_exit default_device_exit_batch(struct list_head *net_list)
6540 /* At exit all network devices most be removed from a network
6541 * namespace. Do this in the reverse order of registration.
6542 * Do this across as many network namespaces as possible to
6543 * improve batching efficiency.
6545 struct net_device *dev;
6547 LIST_HEAD(dev_kill_list);
6550 list_for_each_entry(net, net_list, exit_list) {
6551 for_each_netdev_reverse(net, dev) {
6552 if (dev->rtnl_link_ops)
6553 dev->rtnl_link_ops->dellink(dev, &dev_kill_list);
6555 unregister_netdevice_queue(dev, &dev_kill_list);
6558 unregister_netdevice_many(&dev_kill_list);
6559 list_del(&dev_kill_list);
6563 static struct pernet_operations __net_initdata default_device_ops = {
6564 .exit = default_device_exit,
6565 .exit_batch = default_device_exit_batch,
6569 * Initialize the DEV module. At boot time this walks the device list and
6570 * unhooks any devices that fail to initialise (normally hardware not
6571 * present) and leaves us with a valid list of present and active devices.
6576 * This is called single threaded during boot, so no need
6577 * to take the rtnl semaphore.
6579 static int __init net_dev_init(void)
6581 int i, rc = -ENOMEM;
6583 BUG_ON(!dev_boot_phase);
6585 if (dev_proc_init())
6588 if (netdev_kobject_init())
6591 INIT_LIST_HEAD(&ptype_all);
6592 for (i = 0; i < PTYPE_HASH_SIZE; i++)
6593 INIT_LIST_HEAD(&ptype_base[i]);
6595 if (register_pernet_subsys(&netdev_net_ops))
6599 * Initialise the packet receive queues.
6602 for_each_possible_cpu(i) {
6603 struct softnet_data *sd = &per_cpu(softnet_data, i);
6605 memset(sd, 0, sizeof(*sd));
6606 skb_queue_head_init(&sd->input_pkt_queue);
6607 skb_queue_head_init(&sd->process_queue);
6608 sd->completion_queue = NULL;
6609 INIT_LIST_HEAD(&sd->poll_list);
6610 sd->output_queue = NULL;
6611 sd->output_queue_tailp = &sd->output_queue;
6613 sd->csd.func = rps_trigger_softirq;
6619 sd->backlog.poll = process_backlog;
6620 sd->backlog.weight = weight_p;
6621 sd->backlog.gro_list = NULL;
6622 sd->backlog.gro_count = 0;
6627 /* The loopback device is special if any other network devices
6628 * is present in a network namespace the loopback device must
6629 * be present. Since we now dynamically allocate and free the
6630 * loopback device ensure this invariant is maintained by
6631 * keeping the loopback device as the first device on the
6632 * list of network devices. Ensuring the loopback devices
6633 * is the first device that appears and the last network device
6636 if (register_pernet_device(&loopback_net_ops))
6639 if (register_pernet_device(&default_device_ops))
6642 open_softirq(NET_TX_SOFTIRQ, net_tx_action);
6643 open_softirq(NET_RX_SOFTIRQ, net_rx_action);
6645 hotcpu_notifier(dev_cpu_callback, 0);
6653 subsys_initcall(net_dev_init);
6655 static int __init initialize_hashrnd(void)
6657 get_random_bytes(&hashrnd, sizeof(hashrnd));
6661 late_initcall_sync(initialize_hashrnd);