2 * originally based on the dummy device.
4 * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
5 * Licensed under the GPL. Based on dummy.c, and eql.c devices.
7 * bonding.c: an Ethernet Bonding driver
9 * This is useful to talk to a Cisco EtherChannel compatible equipment:
11 * Sun Trunking (Solaris)
12 * Alteon AceDirector Trunks
14 * and probably many L2 switches ...
17 * ifconfig bond0 ipaddress netmask up
18 * will setup a network device, with an ip address. No mac address
19 * will be assigned at this time. The hw mac address will come from
20 * the first slave bonded to the channel. All slaves will then use
21 * this hw mac address.
24 * will release all slaves, marking them as down.
26 * ifenslave bond0 eth0
27 * will attach eth0 to bond0 as a slave. eth0 hw mac address will either
28 * a: be used as initial mac address
29 * b: if a hw mac address already is there, eth0's hw mac address
30 * will then be set from bond0.
34 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
36 #include <linux/kernel.h>
37 #include <linux/module.h>
38 #include <linux/types.h>
39 #include <linux/fcntl.h>
40 #include <linux/interrupt.h>
41 #include <linux/ptrace.h>
42 #include <linux/ioport.h>
46 #include <linux/tcp.h>
47 #include <linux/udp.h>
48 #include <linux/slab.h>
49 #include <linux/string.h>
50 #include <linux/init.h>
51 #include <linux/timer.h>
52 #include <linux/socket.h>
53 #include <linux/ctype.h>
54 #include <linux/inet.h>
55 #include <linux/bitops.h>
58 #include <linux/uaccess.h>
59 #include <linux/errno.h>
60 #include <linux/netdevice.h>
61 #include <linux/inetdevice.h>
62 #include <linux/igmp.h>
63 #include <linux/etherdevice.h>
64 #include <linux/skbuff.h>
66 #include <linux/rtnetlink.h>
67 #include <linux/smp.h>
68 #include <linux/if_ether.h>
70 #include <linux/mii.h>
71 #include <linux/ethtool.h>
72 #include <linux/if_vlan.h>
73 #include <linux/if_bonding.h>
74 #include <linux/jiffies.h>
75 #include <linux/preempt.h>
76 #include <net/route.h>
77 #include <net/net_namespace.h>
78 #include <net/netns/generic.h>
79 #include <net/pkt_sched.h>
84 /*---------------------------- Module parameters ----------------------------*/
86 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
87 #define BOND_LINK_MON_INTERV 0
88 #define BOND_LINK_ARP_INTERV 0
90 static int max_bonds = BOND_DEFAULT_MAX_BONDS;
91 static int tx_queues = BOND_DEFAULT_TX_QUEUES;
92 static int num_peer_notif = 1;
93 static int miimon = BOND_LINK_MON_INTERV;
96 static int use_carrier = 1;
99 static char *primary_reselect;
100 static char *lacp_rate;
101 static int min_links;
102 static char *ad_select;
103 static char *xmit_hash_policy;
104 static int arp_interval = BOND_LINK_ARP_INTERV;
105 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
106 static char *arp_validate;
107 static char *fail_over_mac;
108 static int all_slaves_active = 0;
109 static struct bond_params bonding_defaults;
110 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
112 module_param(max_bonds, int, 0);
113 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
114 module_param(tx_queues, int, 0);
115 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
116 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
117 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
118 "failover event (alias of num_unsol_na)");
119 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
120 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
121 "failover event (alias of num_grat_arp)");
122 module_param(miimon, int, 0);
123 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
124 module_param(updelay, int, 0);
125 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
126 module_param(downdelay, int, 0);
127 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
129 module_param(use_carrier, int, 0);
130 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
131 "0 for off, 1 for on (default)");
132 module_param(mode, charp, 0);
133 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
134 "1 for active-backup, 2 for balance-xor, "
135 "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
136 "6 for balance-alb");
137 module_param(primary, charp, 0);
138 MODULE_PARM_DESC(primary, "Primary network device to use");
139 module_param(primary_reselect, charp, 0);
140 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
142 "0 for always (default), "
143 "1 for only if speed of primary is "
145 "2 for only on active slave "
147 module_param(lacp_rate, charp, 0);
148 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
149 "0 for slow, 1 for fast");
150 module_param(ad_select, charp, 0);
151 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic; "
152 "0 for stable (default), 1 for bandwidth, "
154 module_param(min_links, int, 0);
155 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
157 module_param(xmit_hash_policy, charp, 0);
158 MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; "
159 "0 for layer 2 (default), 1 for layer 3+4, "
161 module_param(arp_interval, int, 0);
162 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
163 module_param_array(arp_ip_target, charp, NULL, 0);
164 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
165 module_param(arp_validate, charp, 0);
166 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
167 "0 for none (default), 1 for active, "
168 "2 for backup, 3 for all");
169 module_param(fail_over_mac, charp, 0);
170 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
171 "the same MAC; 0 for none (default), "
172 "1 for active, 2 for follow");
173 module_param(all_slaves_active, int, 0);
174 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface"
175 "by setting active flag for all slaves; "
176 "0 for never (default), 1 for always.");
177 module_param(resend_igmp, int, 0);
178 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
181 /*----------------------------- Global variables ----------------------------*/
183 #ifdef CONFIG_NET_POLL_CONTROLLER
184 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
187 int bond_net_id __read_mostly;
189 static __be32 arp_target[BOND_MAX_ARP_TARGETS];
190 static int arp_ip_count;
191 static int bond_mode = BOND_MODE_ROUNDROBIN;
192 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
193 static int lacp_fast;
195 const struct bond_parm_tbl bond_lacp_tbl[] = {
196 { "slow", AD_LACP_SLOW},
197 { "fast", AD_LACP_FAST},
201 const struct bond_parm_tbl bond_mode_tbl[] = {
202 { "balance-rr", BOND_MODE_ROUNDROBIN},
203 { "active-backup", BOND_MODE_ACTIVEBACKUP},
204 { "balance-xor", BOND_MODE_XOR},
205 { "broadcast", BOND_MODE_BROADCAST},
206 { "802.3ad", BOND_MODE_8023AD},
207 { "balance-tlb", BOND_MODE_TLB},
208 { "balance-alb", BOND_MODE_ALB},
212 const struct bond_parm_tbl xmit_hashtype_tbl[] = {
213 { "layer2", BOND_XMIT_POLICY_LAYER2},
214 { "layer3+4", BOND_XMIT_POLICY_LAYER34},
215 { "layer2+3", BOND_XMIT_POLICY_LAYER23},
219 const struct bond_parm_tbl arp_validate_tbl[] = {
220 { "none", BOND_ARP_VALIDATE_NONE},
221 { "active", BOND_ARP_VALIDATE_ACTIVE},
222 { "backup", BOND_ARP_VALIDATE_BACKUP},
223 { "all", BOND_ARP_VALIDATE_ALL},
227 const struct bond_parm_tbl fail_over_mac_tbl[] = {
228 { "none", BOND_FOM_NONE},
229 { "active", BOND_FOM_ACTIVE},
230 { "follow", BOND_FOM_FOLLOW},
234 const struct bond_parm_tbl pri_reselect_tbl[] = {
235 { "always", BOND_PRI_RESELECT_ALWAYS},
236 { "better", BOND_PRI_RESELECT_BETTER},
237 { "failure", BOND_PRI_RESELECT_FAILURE},
241 struct bond_parm_tbl ad_select_tbl[] = {
242 { "stable", BOND_AD_STABLE},
243 { "bandwidth", BOND_AD_BANDWIDTH},
244 { "count", BOND_AD_COUNT},
248 /*-------------------------- Forward declarations ---------------------------*/
250 static int bond_init(struct net_device *bond_dev);
251 static void bond_uninit(struct net_device *bond_dev);
253 /*---------------------------- General routines -----------------------------*/
255 const char *bond_mode_name(int mode)
257 static const char *names[] = {
258 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
259 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
260 [BOND_MODE_XOR] = "load balancing (xor)",
261 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
262 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
263 [BOND_MODE_TLB] = "transmit load balancing",
264 [BOND_MODE_ALB] = "adaptive load balancing",
267 if (mode < 0 || mode > BOND_MODE_ALB)
273 /*---------------------------------- VLAN -----------------------------------*/
276 * bond_add_vlan - add a new vlan id on bond
277 * @bond: bond that got the notification
278 * @vlan_id: the vlan id to add
280 * Returns -ENOMEM if allocation failed.
282 static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
284 struct vlan_entry *vlan;
286 pr_debug("bond: %s, vlan id %d\n",
287 (bond ? bond->dev->name : "None"), vlan_id);
289 vlan = kzalloc(sizeof(struct vlan_entry), GFP_KERNEL);
293 INIT_LIST_HEAD(&vlan->vlan_list);
294 vlan->vlan_id = vlan_id;
296 write_lock_bh(&bond->lock);
298 list_add_tail(&vlan->vlan_list, &bond->vlan_list);
300 write_unlock_bh(&bond->lock);
302 pr_debug("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
308 * bond_del_vlan - delete a vlan id from bond
309 * @bond: bond that got the notification
310 * @vlan_id: the vlan id to delete
312 * returns -ENODEV if @vlan_id was not found in @bond.
314 static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
316 struct vlan_entry *vlan;
319 pr_debug("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
322 write_lock_bh(&bond->lock);
324 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
325 if (vlan->vlan_id == vlan_id) {
326 list_del(&vlan->vlan_list);
328 if (bond_is_lb(bond))
329 bond_alb_clear_vlan(bond, vlan_id);
331 pr_debug("removed VLAN ID %d from bond %s\n",
332 vlan_id, bond->dev->name);
341 pr_debug("couldn't find VLAN ID %d in bond %s\n",
342 vlan_id, bond->dev->name);
345 write_unlock_bh(&bond->lock);
346 unblock_netpoll_tx();
351 * bond_next_vlan - safely skip to the next item in the vlans list.
352 * @bond: the bond we're working on
353 * @curr: item we're advancing from
355 * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
356 * or @curr->next otherwise (even if it is @curr itself again).
358 * Caller must hold bond->lock
360 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
362 struct vlan_entry *next, *last;
364 if (list_empty(&bond->vlan_list))
368 next = list_entry(bond->vlan_list.next,
369 struct vlan_entry, vlan_list);
371 last = list_entry(bond->vlan_list.prev,
372 struct vlan_entry, vlan_list);
374 next = list_entry(bond->vlan_list.next,
375 struct vlan_entry, vlan_list);
377 next = list_entry(curr->vlan_list.next,
378 struct vlan_entry, vlan_list);
386 * bond_dev_queue_xmit - Prepare skb for xmit.
388 * @bond: bond device that got this skb for tx.
389 * @skb: hw accel VLAN tagged skb to transmit
390 * @slave_dev: slave that is supposed to xmit this skbuff
392 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
393 struct net_device *slave_dev)
395 skb->dev = slave_dev;
397 BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
398 sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
399 skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping;
401 if (unlikely(netpoll_tx_running(slave_dev)))
402 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
410 * In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
411 * We don't protect the slave list iteration with a lock because:
412 * a. This operation is performed in IOCTL context,
413 * b. The operation is protected by the RTNL semaphore in the 8021q code,
414 * c. Holding a lock with BH disabled while directly calling a base driver
415 * entry point is generally a BAD idea.
417 * The design of synchronization/protection for this operation in the 8021q
418 * module is good for one or more VLAN devices over a single physical device
419 * and cannot be extended for a teaming solution like bonding, so there is a
420 * potential race condition here where a net device from the vlan group might
421 * be referenced (either by a base driver or the 8021q code) while it is being
422 * removed from the system. However, it turns out we're not making matters
423 * worse, and if it works for regular VLAN usage it will work here too.
427 * bond_vlan_rx_add_vid - Propagates adding an id to slaves
428 * @bond_dev: bonding net device that got called
429 * @vid: vlan id being added
431 static int bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid)
433 struct bonding *bond = netdev_priv(bond_dev);
434 struct slave *slave, *stop_at;
437 bond_for_each_slave(bond, slave, i) {
438 res = vlan_vid_add(slave->dev, vid);
443 res = bond_add_vlan(bond, vid);
445 pr_err("%s: Error: Failed to add vlan id %d\n",
446 bond_dev->name, vid);
453 /* unwind from head to the slave that failed */
455 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at)
456 vlan_vid_del(slave->dev, vid);
462 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
463 * @bond_dev: bonding net device that got called
464 * @vid: vlan id being removed
466 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid)
468 struct bonding *bond = netdev_priv(bond_dev);
472 bond_for_each_slave(bond, slave, i)
473 vlan_vid_del(slave->dev, vid);
475 res = bond_del_vlan(bond, vid);
477 pr_err("%s: Error: Failed to remove vlan id %d\n",
478 bond_dev->name, vid);
485 static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
487 struct vlan_entry *vlan;
490 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
491 res = vlan_vid_add(slave_dev, vlan->vlan_id);
493 pr_warning("%s: Failed to add vlan id %d to device %s\n",
494 bond->dev->name, vlan->vlan_id,
499 static void bond_del_vlans_from_slave(struct bonding *bond,
500 struct net_device *slave_dev)
502 struct vlan_entry *vlan;
504 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
507 vlan_vid_del(slave_dev, vlan->vlan_id);
511 /*------------------------------- Link status -------------------------------*/
514 * Set the carrier state for the master according to the state of its
515 * slaves. If any slaves are up, the master is up. In 802.3ad mode,
516 * do special 802.3ad magic.
518 * Returns zero if carrier state does not change, nonzero if it does.
520 static int bond_set_carrier(struct bonding *bond)
525 if (bond->slave_cnt == 0)
528 if (bond->params.mode == BOND_MODE_8023AD)
529 return bond_3ad_set_carrier(bond);
531 bond_for_each_slave(bond, slave, i) {
532 if (slave->link == BOND_LINK_UP) {
533 if (!netif_carrier_ok(bond->dev)) {
534 netif_carrier_on(bond->dev);
542 if (netif_carrier_ok(bond->dev)) {
543 netif_carrier_off(bond->dev);
550 * Get link speed and duplex from the slave's base driver
551 * using ethtool. If for some reason the call fails or the
552 * values are invalid, set speed and duplex to -1,
555 static void bond_update_speed_duplex(struct slave *slave)
557 struct net_device *slave_dev = slave->dev;
558 struct ethtool_cmd ecmd;
562 slave->speed = SPEED_UNKNOWN;
563 slave->duplex = DUPLEX_UNKNOWN;
565 res = __ethtool_get_settings(slave_dev, &ecmd);
569 slave_speed = ethtool_cmd_speed(&ecmd);
570 if (slave_speed == 0 || slave_speed == ((__u32) -1))
573 switch (ecmd.duplex) {
581 slave->speed = slave_speed;
582 slave->duplex = ecmd.duplex;
588 * if <dev> supports MII link status reporting, check its link status.
590 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
591 * depending upon the setting of the use_carrier parameter.
593 * Return either BMSR_LSTATUS, meaning that the link is up (or we
594 * can't tell and just pretend it is), or 0, meaning that the link is
597 * If reporting is non-zero, instead of faking link up, return -1 if
598 * both ETHTOOL and MII ioctls fail (meaning the device does not
599 * support them). If use_carrier is set, return whatever it says.
600 * It'd be nice if there was a good way to tell if a driver supports
601 * netif_carrier, but there really isn't.
603 static int bond_check_dev_link(struct bonding *bond,
604 struct net_device *slave_dev, int reporting)
606 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
607 int (*ioctl)(struct net_device *, struct ifreq *, int);
609 struct mii_ioctl_data *mii;
611 if (!reporting && !netif_running(slave_dev))
614 if (bond->params.use_carrier)
615 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
617 /* Try to get link status using Ethtool first. */
618 if (slave_dev->ethtool_ops) {
619 if (slave_dev->ethtool_ops->get_link) {
622 link = slave_dev->ethtool_ops->get_link(slave_dev);
624 return link ? BMSR_LSTATUS : 0;
628 /* Ethtool can't be used, fallback to MII ioctls. */
629 ioctl = slave_ops->ndo_do_ioctl;
631 /* TODO: set pointer to correct ioctl on a per team member */
632 /* bases to make this more efficient. that is, once */
633 /* we determine the correct ioctl, we will always */
634 /* call it and not the others for that team */
638 * We cannot assume that SIOCGMIIPHY will also read a
639 * register; not all network drivers (e.g., e100)
643 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
644 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
646 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
647 mii->reg_num = MII_BMSR;
648 if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
649 return mii->val_out & BMSR_LSTATUS;
654 * If reporting, report that either there's no dev->do_ioctl,
655 * or both SIOCGMIIREG and get_link failed (meaning that we
656 * cannot report link status). If not reporting, pretend
659 return reporting ? -1 : BMSR_LSTATUS;
662 /*----------------------------- Multicast list ------------------------------*/
665 * Push the promiscuity flag down to appropriate slaves
667 static int bond_set_promiscuity(struct bonding *bond, int inc)
670 if (USES_PRIMARY(bond->params.mode)) {
671 /* write lock already acquired */
672 if (bond->curr_active_slave) {
673 err = dev_set_promiscuity(bond->curr_active_slave->dev,
679 bond_for_each_slave(bond, slave, i) {
680 err = dev_set_promiscuity(slave->dev, inc);
689 * Push the allmulti flag down to all slaves
691 static int bond_set_allmulti(struct bonding *bond, int inc)
694 if (USES_PRIMARY(bond->params.mode)) {
695 /* write lock already acquired */
696 if (bond->curr_active_slave) {
697 err = dev_set_allmulti(bond->curr_active_slave->dev,
703 bond_for_each_slave(bond, slave, i) {
704 err = dev_set_allmulti(slave->dev, inc);
713 * Add a Multicast address to slaves
716 static void bond_mc_add(struct bonding *bond, void *addr)
718 if (USES_PRIMARY(bond->params.mode)) {
719 /* write lock already acquired */
720 if (bond->curr_active_slave)
721 dev_mc_add(bond->curr_active_slave->dev, addr);
726 bond_for_each_slave(bond, slave, i)
727 dev_mc_add(slave->dev, addr);
732 * Remove a multicast address from slave
735 static void bond_mc_del(struct bonding *bond, void *addr)
737 if (USES_PRIMARY(bond->params.mode)) {
738 /* write lock already acquired */
739 if (bond->curr_active_slave)
740 dev_mc_del(bond->curr_active_slave->dev, addr);
744 bond_for_each_slave(bond, slave, i) {
745 dev_mc_del(slave->dev, addr);
751 static void __bond_resend_igmp_join_requests(struct net_device *dev)
753 struct in_device *in_dev;
756 in_dev = __in_dev_get_rcu(dev);
758 ip_mc_rejoin_groups(in_dev);
763 * Retrieve the list of registered multicast addresses for the bonding
764 * device and retransmit an IGMP JOIN request to the current active
767 static void bond_resend_igmp_join_requests(struct bonding *bond)
769 struct net_device *bond_dev, *vlan_dev, *master_dev;
770 struct vlan_entry *vlan;
772 read_lock(&bond->lock);
774 bond_dev = bond->dev;
776 /* rejoin all groups on bond device */
777 __bond_resend_igmp_join_requests(bond_dev);
780 * if bond is enslaved to a bridge,
781 * then rejoin all groups on its master
783 master_dev = bond_dev->master;
785 if ((master_dev->priv_flags & IFF_EBRIDGE)
786 && (bond_dev->priv_flags & IFF_BRIDGE_PORT))
787 __bond_resend_igmp_join_requests(master_dev);
789 /* rejoin all groups on vlan devices */
790 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
792 vlan_dev = __vlan_find_dev_deep(bond_dev,
796 __bond_resend_igmp_join_requests(vlan_dev);
799 if (--bond->igmp_retrans > 0)
800 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
802 read_unlock(&bond->lock);
805 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
807 struct bonding *bond = container_of(work, struct bonding,
809 bond_resend_igmp_join_requests(bond);
813 * flush all members of flush->mc_list from device dev->mc_list
815 static void bond_mc_list_flush(struct net_device *bond_dev,
816 struct net_device *slave_dev)
818 struct bonding *bond = netdev_priv(bond_dev);
819 struct netdev_hw_addr *ha;
821 netdev_for_each_mc_addr(ha, bond_dev)
822 dev_mc_del(slave_dev, ha->addr);
824 if (bond->params.mode == BOND_MODE_8023AD) {
825 /* del lacpdu mc addr from mc list */
826 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
828 dev_mc_del(slave_dev, lacpdu_multicast);
832 /*--------------------------- Active slave change ---------------------------*/
835 * Update the mc list and multicast-related flags for the new and
836 * old active slaves (if any) according to the multicast mode, and
837 * promiscuous flags unconditionally.
839 static void bond_mc_swap(struct bonding *bond, struct slave *new_active,
840 struct slave *old_active)
842 struct netdev_hw_addr *ha;
844 if (!USES_PRIMARY(bond->params.mode))
845 /* nothing to do - mc list is already up-to-date on
851 if (bond->dev->flags & IFF_PROMISC)
852 dev_set_promiscuity(old_active->dev, -1);
854 if (bond->dev->flags & IFF_ALLMULTI)
855 dev_set_allmulti(old_active->dev, -1);
857 netdev_for_each_mc_addr(ha, bond->dev)
858 dev_mc_del(old_active->dev, ha->addr);
862 /* FIXME: Signal errors upstream. */
863 if (bond->dev->flags & IFF_PROMISC)
864 dev_set_promiscuity(new_active->dev, 1);
866 if (bond->dev->flags & IFF_ALLMULTI)
867 dev_set_allmulti(new_active->dev, 1);
869 netdev_for_each_mc_addr(ha, bond->dev)
870 dev_mc_add(new_active->dev, ha->addr);
875 * bond_do_fail_over_mac
877 * Perform special MAC address swapping for fail_over_mac settings
879 * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh.
881 static void bond_do_fail_over_mac(struct bonding *bond,
882 struct slave *new_active,
883 struct slave *old_active)
884 __releases(&bond->curr_slave_lock)
885 __releases(&bond->lock)
886 __acquires(&bond->lock)
887 __acquires(&bond->curr_slave_lock)
889 u8 tmp_mac[ETH_ALEN];
890 struct sockaddr saddr;
893 switch (bond->params.fail_over_mac) {
894 case BOND_FOM_ACTIVE:
896 memcpy(bond->dev->dev_addr, new_active->dev->dev_addr,
897 new_active->dev->addr_len);
898 write_unlock_bh(&bond->curr_slave_lock);
899 read_unlock(&bond->lock);
900 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
901 read_lock(&bond->lock);
902 write_lock_bh(&bond->curr_slave_lock);
905 case BOND_FOM_FOLLOW:
907 * if new_active && old_active, swap them
908 * if just old_active, do nothing (going to no active slave)
909 * if just new_active, set new_active to bond's MAC
914 write_unlock_bh(&bond->curr_slave_lock);
915 read_unlock(&bond->lock);
918 memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN);
919 memcpy(saddr.sa_data, old_active->dev->dev_addr,
921 saddr.sa_family = new_active->dev->type;
923 memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN);
924 saddr.sa_family = bond->dev->type;
927 rv = dev_set_mac_address(new_active->dev, &saddr);
929 pr_err("%s: Error %d setting MAC of slave %s\n",
930 bond->dev->name, -rv, new_active->dev->name);
937 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN);
938 saddr.sa_family = old_active->dev->type;
940 rv = dev_set_mac_address(old_active->dev, &saddr);
942 pr_err("%s: Error %d setting MAC of slave %s\n",
943 bond->dev->name, -rv, new_active->dev->name);
945 read_lock(&bond->lock);
946 write_lock_bh(&bond->curr_slave_lock);
949 pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n",
950 bond->dev->name, bond->params.fail_over_mac);
956 static bool bond_should_change_active(struct bonding *bond)
958 struct slave *prim = bond->primary_slave;
959 struct slave *curr = bond->curr_active_slave;
961 if (!prim || !curr || curr->link != BOND_LINK_UP)
963 if (bond->force_primary) {
964 bond->force_primary = false;
967 if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
968 (prim->speed < curr->speed ||
969 (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
971 if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
977 * find_best_interface - select the best available slave to be the active one
978 * @bond: our bonding struct
980 * Warning: Caller must hold curr_slave_lock for writing.
982 static struct slave *bond_find_best_slave(struct bonding *bond)
984 struct slave *new_active, *old_active;
985 struct slave *bestslave = NULL;
986 int mintime = bond->params.updelay;
989 new_active = bond->curr_active_slave;
991 if (!new_active) { /* there were no active slaves left */
992 if (bond->slave_cnt > 0) /* found one slave */
993 new_active = bond->first_slave;
995 return NULL; /* still no slave, return NULL */
998 if ((bond->primary_slave) &&
999 bond->primary_slave->link == BOND_LINK_UP &&
1000 bond_should_change_active(bond)) {
1001 new_active = bond->primary_slave;
1004 /* remember where to stop iterating over the slaves */
1005 old_active = new_active;
1007 bond_for_each_slave_from(bond, new_active, i, old_active) {
1008 if (new_active->link == BOND_LINK_UP) {
1010 } else if (new_active->link == BOND_LINK_BACK &&
1011 IS_UP(new_active->dev)) {
1012 /* link up, but waiting for stabilization */
1013 if (new_active->delay < mintime) {
1014 mintime = new_active->delay;
1015 bestslave = new_active;
1023 static bool bond_should_notify_peers(struct bonding *bond)
1025 struct slave *slave = bond->curr_active_slave;
1027 pr_debug("bond_should_notify_peers: bond %s slave %s\n",
1028 bond->dev->name, slave ? slave->dev->name : "NULL");
1030 if (!slave || !bond->send_peer_notif ||
1031 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
1034 bond->send_peer_notif--;
1039 * change_active_interface - change the active slave into the specified one
1040 * @bond: our bonding struct
1041 * @new: the new slave to make the active one
1043 * Set the new slave to the bond's settings and unset them on the old
1044 * curr_active_slave.
1045 * Setting include flags, mc-list, promiscuity, allmulti, etc.
1047 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1048 * because it is apparently the best available slave we have, even though its
1049 * updelay hasn't timed out yet.
1051 * If new_active is not NULL, caller must hold bond->lock for read and
1052 * curr_slave_lock for write_bh.
1054 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1056 struct slave *old_active = bond->curr_active_slave;
1058 if (old_active == new_active)
1062 new_active->jiffies = jiffies;
1064 if (new_active->link == BOND_LINK_BACK) {
1065 if (USES_PRIMARY(bond->params.mode)) {
1066 pr_info("%s: making interface %s the new active one %d ms earlier.\n",
1067 bond->dev->name, new_active->dev->name,
1068 (bond->params.updelay - new_active->delay) * bond->params.miimon);
1071 new_active->delay = 0;
1072 new_active->link = BOND_LINK_UP;
1074 if (bond->params.mode == BOND_MODE_8023AD)
1075 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1077 if (bond_is_lb(bond))
1078 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1080 if (USES_PRIMARY(bond->params.mode)) {
1081 pr_info("%s: making interface %s the new active one.\n",
1082 bond->dev->name, new_active->dev->name);
1087 if (USES_PRIMARY(bond->params.mode))
1088 bond_mc_swap(bond, new_active, old_active);
1090 if (bond_is_lb(bond)) {
1091 bond_alb_handle_active_change(bond, new_active);
1093 bond_set_slave_inactive_flags(old_active);
1095 bond_set_slave_active_flags(new_active);
1097 bond->curr_active_slave = new_active;
1100 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1102 bond_set_slave_inactive_flags(old_active);
1105 bool should_notify_peers = false;
1107 bond_set_slave_active_flags(new_active);
1109 if (bond->params.fail_over_mac)
1110 bond_do_fail_over_mac(bond, new_active,
1113 if (netif_running(bond->dev)) {
1114 bond->send_peer_notif =
1115 bond->params.num_peer_notif;
1116 should_notify_peers =
1117 bond_should_notify_peers(bond);
1120 write_unlock_bh(&bond->curr_slave_lock);
1121 read_unlock(&bond->lock);
1123 netdev_bonding_change(bond->dev, NETDEV_BONDING_FAILOVER);
1124 if (should_notify_peers)
1125 netdev_bonding_change(bond->dev,
1126 NETDEV_NOTIFY_PEERS);
1128 read_lock(&bond->lock);
1129 write_lock_bh(&bond->curr_slave_lock);
1133 /* resend IGMP joins since active slave has changed or
1134 * all were sent on curr_active_slave.
1135 * resend only if bond is brought up with the affected
1136 * bonding modes and the retransmission is enabled */
1137 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
1138 ((USES_PRIMARY(bond->params.mode) && new_active) ||
1139 bond->params.mode == BOND_MODE_ROUNDROBIN)) {
1140 bond->igmp_retrans = bond->params.resend_igmp;
1141 queue_delayed_work(bond->wq, &bond->mcast_work, 0);
1146 * bond_select_active_slave - select a new active slave, if needed
1147 * @bond: our bonding struct
1149 * This functions should be called when one of the following occurs:
1150 * - The old curr_active_slave has been released or lost its link.
1151 * - The primary_slave has got its link back.
1152 * - A slave has got its link back and there's no old curr_active_slave.
1154 * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
1156 void bond_select_active_slave(struct bonding *bond)
1158 struct slave *best_slave;
1161 best_slave = bond_find_best_slave(bond);
1162 if (best_slave != bond->curr_active_slave) {
1163 bond_change_active_slave(bond, best_slave);
1164 rv = bond_set_carrier(bond);
1168 if (netif_carrier_ok(bond->dev)) {
1169 pr_info("%s: first active interface up!\n",
1172 pr_info("%s: now running without any active interface !\n",
1178 /*--------------------------- slave list handling ---------------------------*/
1181 * This function attaches the slave to the end of list.
1183 * bond->lock held for writing by caller.
1185 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1187 if (bond->first_slave == NULL) { /* attaching the first slave */
1188 new_slave->next = new_slave;
1189 new_slave->prev = new_slave;
1190 bond->first_slave = new_slave;
1192 new_slave->next = bond->first_slave;
1193 new_slave->prev = bond->first_slave->prev;
1194 new_slave->next->prev = new_slave;
1195 new_slave->prev->next = new_slave;
1202 * This function detaches the slave from the list.
1203 * WARNING: no check is made to verify if the slave effectively
1204 * belongs to <bond>.
1205 * Nothing is freed on return, structures are just unchained.
1206 * If any slave pointer in bond was pointing to <slave>,
1207 * it should be changed by the calling function.
1209 * bond->lock held for writing by caller.
1211 static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1214 slave->next->prev = slave->prev;
1217 slave->prev->next = slave->next;
1219 if (bond->first_slave == slave) { /* slave is the first slave */
1220 if (bond->slave_cnt > 1) { /* there are more slave */
1221 bond->first_slave = slave->next;
1223 bond->first_slave = NULL; /* slave was the last one */
1232 #ifdef CONFIG_NET_POLL_CONTROLLER
1233 static inline int slave_enable_netpoll(struct slave *slave)
1238 np = kzalloc(sizeof(*np), GFP_KERNEL);
1243 err = __netpoll_setup(np, slave->dev);
1252 static inline void slave_disable_netpoll(struct slave *slave)
1254 struct netpoll *np = slave->np;
1260 synchronize_rcu_bh();
1261 __netpoll_cleanup(np);
1264 static inline bool slave_dev_support_netpoll(struct net_device *slave_dev)
1266 if (slave_dev->priv_flags & IFF_DISABLE_NETPOLL)
1268 if (!slave_dev->netdev_ops->ndo_poll_controller)
1273 static void bond_poll_controller(struct net_device *bond_dev)
1277 static void __bond_netpoll_cleanup(struct bonding *bond)
1279 struct slave *slave;
1282 bond_for_each_slave(bond, slave, i)
1283 if (IS_UP(slave->dev))
1284 slave_disable_netpoll(slave);
1286 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1288 struct bonding *bond = netdev_priv(bond_dev);
1290 read_lock(&bond->lock);
1291 __bond_netpoll_cleanup(bond);
1292 read_unlock(&bond->lock);
1295 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1297 struct bonding *bond = netdev_priv(dev);
1298 struct slave *slave;
1301 read_lock(&bond->lock);
1302 bond_for_each_slave(bond, slave, i) {
1303 err = slave_enable_netpoll(slave);
1305 __bond_netpoll_cleanup(bond);
1309 read_unlock(&bond->lock);
1313 static struct netpoll_info *bond_netpoll_info(struct bonding *bond)
1315 return bond->dev->npinfo;
1319 static inline int slave_enable_netpoll(struct slave *slave)
1323 static inline void slave_disable_netpoll(struct slave *slave)
1326 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1331 /*---------------------------------- IOCTL ----------------------------------*/
1333 static int bond_sethwaddr(struct net_device *bond_dev,
1334 struct net_device *slave_dev)
1336 pr_debug("bond_dev=%p\n", bond_dev);
1337 pr_debug("slave_dev=%p\n", slave_dev);
1338 pr_debug("slave_dev->addr_len=%d\n", slave_dev->addr_len);
1339 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
1343 static netdev_features_t bond_fix_features(struct net_device *dev,
1344 netdev_features_t features)
1346 struct slave *slave;
1347 struct bonding *bond = netdev_priv(dev);
1348 netdev_features_t mask;
1351 read_lock(&bond->lock);
1353 if (!bond->first_slave) {
1354 /* Disable adding VLANs to empty bond. But why? --mq */
1355 features |= NETIF_F_VLAN_CHALLENGED;
1360 features &= ~NETIF_F_ONE_FOR_ALL;
1361 features |= NETIF_F_ALL_FOR_ALL;
1363 bond_for_each_slave(bond, slave, i) {
1364 features = netdev_increment_features(features,
1365 slave->dev->features,
1370 read_unlock(&bond->lock);
1374 #define BOND_VLAN_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | \
1375 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1376 NETIF_F_HIGHDMA | NETIF_F_LRO)
1378 static void bond_compute_features(struct bonding *bond)
1380 struct slave *slave;
1381 struct net_device *bond_dev = bond->dev;
1382 netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1383 unsigned short max_hard_header_len = ETH_HLEN;
1385 unsigned int flags, dst_release_flag = IFF_XMIT_DST_RELEASE;
1387 read_lock(&bond->lock);
1389 if (!bond->first_slave)
1392 bond_for_each_slave(bond, slave, i) {
1393 vlan_features = netdev_increment_features(vlan_features,
1394 slave->dev->vlan_features, BOND_VLAN_FEATURES);
1396 dst_release_flag &= slave->dev->priv_flags;
1397 if (slave->dev->hard_header_len > max_hard_header_len)
1398 max_hard_header_len = slave->dev->hard_header_len;
1402 bond_dev->vlan_features = vlan_features;
1403 bond_dev->hard_header_len = max_hard_header_len;
1405 flags = bond_dev->priv_flags & ~IFF_XMIT_DST_RELEASE;
1406 bond_dev->priv_flags = flags | dst_release_flag;
1408 read_unlock(&bond->lock);
1410 netdev_change_features(bond_dev);
1413 static void bond_setup_by_slave(struct net_device *bond_dev,
1414 struct net_device *slave_dev)
1416 struct bonding *bond = netdev_priv(bond_dev);
1418 bond_dev->header_ops = slave_dev->header_ops;
1420 bond_dev->type = slave_dev->type;
1421 bond_dev->hard_header_len = slave_dev->hard_header_len;
1422 bond_dev->addr_len = slave_dev->addr_len;
1424 memcpy(bond_dev->broadcast, slave_dev->broadcast,
1425 slave_dev->addr_len);
1426 bond->setup_by_slave = 1;
1429 /* On bonding slaves other than the currently active slave, suppress
1430 * duplicates except for alb non-mcast/bcast.
1432 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1433 struct slave *slave,
1434 struct bonding *bond)
1436 if (bond_is_slave_inactive(slave)) {
1437 if (bond->params.mode == BOND_MODE_ALB &&
1438 skb->pkt_type != PACKET_BROADCAST &&
1439 skb->pkt_type != PACKET_MULTICAST)
1446 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1448 struct sk_buff *skb = *pskb;
1449 struct slave *slave;
1450 struct bonding *bond;
1451 int (*recv_probe)(const struct sk_buff *, struct bonding *,
1453 int ret = RX_HANDLER_ANOTHER;
1455 skb = skb_share_check(skb, GFP_ATOMIC);
1457 return RX_HANDLER_CONSUMED;
1461 slave = bond_slave_get_rcu(skb->dev);
1464 if (bond->params.arp_interval)
1465 slave->dev->last_rx = jiffies;
1467 recv_probe = ACCESS_ONCE(bond->recv_probe);
1469 ret = recv_probe(skb, bond, slave);
1470 if (ret == RX_HANDLER_CONSUMED) {
1476 if (bond_should_deliver_exact_match(skb, slave, bond)) {
1477 return RX_HANDLER_EXACT;
1480 skb->dev = bond->dev;
1482 if (bond->params.mode == BOND_MODE_ALB &&
1483 bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1484 skb->pkt_type == PACKET_HOST) {
1486 if (unlikely(skb_cow_head(skb,
1487 skb->data - skb_mac_header(skb)))) {
1489 return RX_HANDLER_CONSUMED;
1491 memcpy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, ETH_ALEN);
1497 /* enslave device <slave> to bond device <master> */
1498 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1500 struct bonding *bond = netdev_priv(bond_dev);
1501 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1502 struct slave *new_slave = NULL;
1503 struct netdev_hw_addr *ha;
1504 struct sockaddr addr;
1508 if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
1509 slave_ops->ndo_do_ioctl == NULL) {
1510 pr_warning("%s: Warning: no link monitoring support for %s\n",
1511 bond_dev->name, slave_dev->name);
1514 /* already enslaved */
1515 if (slave_dev->flags & IFF_SLAVE) {
1516 pr_debug("Error, Device was already enslaved\n");
1520 /* vlan challenged mutual exclusion */
1521 /* no need to lock since we're protected by rtnl_lock */
1522 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1523 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1524 if (bond_vlan_used(bond)) {
1525 pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1526 bond_dev->name, slave_dev->name, bond_dev->name);
1529 pr_warning("%s: Warning: enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1530 bond_dev->name, slave_dev->name,
1531 slave_dev->name, bond_dev->name);
1534 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1538 * Old ifenslave binaries are no longer supported. These can
1539 * be identified with moderate accuracy by the state of the slave:
1540 * the current ifenslave will set the interface down prior to
1541 * enslaving it; the old ifenslave will not.
1543 if ((slave_dev->flags & IFF_UP)) {
1544 pr_err("%s is up. This may be due to an out of date ifenslave.\n",
1547 goto err_undo_flags;
1550 /* set bonding device ether type by slave - bonding netdevices are
1551 * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1552 * there is a need to override some of the type dependent attribs/funcs.
1554 * bond ether type mutual exclusion - don't allow slaves of dissimilar
1555 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1557 if (bond->slave_cnt == 0) {
1558 if (bond_dev->type != slave_dev->type) {
1559 pr_debug("%s: change device type from %d to %d\n",
1561 bond_dev->type, slave_dev->type);
1563 res = netdev_bonding_change(bond_dev,
1564 NETDEV_PRE_TYPE_CHANGE);
1565 res = notifier_to_errno(res);
1567 pr_err("%s: refused to change device type\n",
1570 goto err_undo_flags;
1573 /* Flush unicast and multicast addresses */
1574 dev_uc_flush(bond_dev);
1575 dev_mc_flush(bond_dev);
1577 if (slave_dev->type != ARPHRD_ETHER)
1578 bond_setup_by_slave(bond_dev, slave_dev);
1580 ether_setup(bond_dev);
1581 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1584 netdev_bonding_change(bond_dev,
1585 NETDEV_POST_TYPE_CHANGE);
1587 } else if (bond_dev->type != slave_dev->type) {
1588 pr_err("%s ether type (%d) is different from other slaves (%d), can not enslave it.\n",
1590 slave_dev->type, bond_dev->type);
1592 goto err_undo_flags;
1595 if (slave_ops->ndo_set_mac_address == NULL) {
1596 if (bond->slave_cnt == 0) {
1597 pr_warning("%s: Warning: The first slave device specified does not support setting the MAC address. Setting fail_over_mac to active.",
1599 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1600 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1601 pr_err("%s: Error: The slave device specified does not support setting the MAC address, but fail_over_mac is not set to active.\n",
1604 goto err_undo_flags;
1608 call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1610 /* If this is the first slave, then we need to set the master's hardware
1611 * address to be the same as the slave's. */
1612 if (is_zero_ether_addr(bond->dev->dev_addr))
1613 memcpy(bond->dev->dev_addr, slave_dev->dev_addr,
1614 slave_dev->addr_len);
1617 new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1620 goto err_undo_flags;
1624 * Set the new_slave's queue_id to be zero. Queue ID mapping
1625 * is set via sysfs or module option if desired.
1627 new_slave->queue_id = 0;
1629 /* Save slave's original mtu and then set it to match the bond */
1630 new_slave->original_mtu = slave_dev->mtu;
1631 res = dev_set_mtu(slave_dev, bond->dev->mtu);
1633 pr_debug("Error %d calling dev_set_mtu\n", res);
1638 * Save slave's original ("permanent") mac address for modes
1639 * that need it, and for restoring it upon release, and then
1640 * set it to the master's address
1642 memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1644 if (!bond->params.fail_over_mac) {
1646 * Set slave to master's mac address. The application already
1647 * set the master's mac address to that of the first slave
1649 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1650 addr.sa_family = slave_dev->type;
1651 res = dev_set_mac_address(slave_dev, &addr);
1653 pr_debug("Error %d calling set_mac_address\n", res);
1654 goto err_restore_mtu;
1658 res = netdev_set_bond_master(slave_dev, bond_dev);
1660 pr_debug("Error %d calling netdev_set_bond_master\n", res);
1661 goto err_restore_mac;
1664 /* open the slave since the application closed it */
1665 res = dev_open(slave_dev);
1667 pr_debug("Opening slave %s failed\n", slave_dev->name);
1668 goto err_unset_master;
1671 new_slave->bond = bond;
1672 new_slave->dev = slave_dev;
1673 slave_dev->priv_flags |= IFF_BONDING;
1675 if (bond_is_lb(bond)) {
1676 /* bond_alb_init_slave() must be called before all other stages since
1677 * it might fail and we do not want to have to undo everything
1679 res = bond_alb_init_slave(bond, new_slave);
1684 /* If the mode USES_PRIMARY, then the new slave gets the
1685 * master's promisc (and mc) settings only if it becomes the
1686 * curr_active_slave, and that is taken care of later when calling
1687 * bond_change_active()
1689 if (!USES_PRIMARY(bond->params.mode)) {
1690 /* set promiscuity level to new slave */
1691 if (bond_dev->flags & IFF_PROMISC) {
1692 res = dev_set_promiscuity(slave_dev, 1);
1697 /* set allmulti level to new slave */
1698 if (bond_dev->flags & IFF_ALLMULTI) {
1699 res = dev_set_allmulti(slave_dev, 1);
1704 netif_addr_lock_bh(bond_dev);
1705 /* upload master's mc_list to new slave */
1706 netdev_for_each_mc_addr(ha, bond_dev)
1707 dev_mc_add(slave_dev, ha->addr);
1708 netif_addr_unlock_bh(bond_dev);
1711 if (bond->params.mode == BOND_MODE_8023AD) {
1712 /* add lacpdu mc addr to mc list */
1713 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1715 dev_mc_add(slave_dev, lacpdu_multicast);
1718 bond_add_vlans_on_slave(bond, slave_dev);
1720 write_lock_bh(&bond->lock);
1722 bond_attach_slave(bond, new_slave);
1724 new_slave->delay = 0;
1725 new_slave->link_failure_count = 0;
1727 write_unlock_bh(&bond->lock);
1729 bond_compute_features(bond);
1731 read_lock(&bond->lock);
1733 new_slave->last_arp_rx = jiffies -
1734 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1736 if (bond->params.miimon && !bond->params.use_carrier) {
1737 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1739 if ((link_reporting == -1) && !bond->params.arp_interval) {
1741 * miimon is set but a bonded network driver
1742 * does not support ETHTOOL/MII and
1743 * arp_interval is not set. Note: if
1744 * use_carrier is enabled, we will never go
1745 * here (because netif_carrier is always
1746 * supported); thus, we don't need to change
1747 * the messages for netif_carrier.
1749 pr_warning("%s: Warning: MII and ETHTOOL support not available for interface %s, and arp_interval/arp_ip_target module parameters not specified, thus bonding will not detect link failures! see bonding.txt for details.\n",
1750 bond_dev->name, slave_dev->name);
1751 } else if (link_reporting == -1) {
1752 /* unable get link status using mii/ethtool */
1753 pr_warning("%s: Warning: can't get link status from interface %s; the network driver associated with this interface does not support MII or ETHTOOL link status reporting, thus miimon has no effect on this interface.\n",
1754 bond_dev->name, slave_dev->name);
1758 /* check for initial state */
1759 if (bond->params.miimon) {
1760 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1761 if (bond->params.updelay) {
1762 new_slave->link = BOND_LINK_BACK;
1763 new_slave->delay = bond->params.updelay;
1765 new_slave->link = BOND_LINK_UP;
1768 new_slave->link = BOND_LINK_DOWN;
1770 } else if (bond->params.arp_interval) {
1771 new_slave->link = (netif_carrier_ok(slave_dev) ?
1772 BOND_LINK_UP : BOND_LINK_DOWN);
1774 new_slave->link = BOND_LINK_UP;
1777 if (new_slave->link != BOND_LINK_DOWN)
1778 new_slave->jiffies = jiffies;
1779 pr_debug("Initial state of slave_dev is BOND_LINK_%s\n",
1780 new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1781 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1783 bond_update_speed_duplex(new_slave);
1785 if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1786 /* if there is a primary slave, remember it */
1787 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1788 bond->primary_slave = new_slave;
1789 bond->force_primary = true;
1793 write_lock_bh(&bond->curr_slave_lock);
1795 switch (bond->params.mode) {
1796 case BOND_MODE_ACTIVEBACKUP:
1797 bond_set_slave_inactive_flags(new_slave);
1798 bond_select_active_slave(bond);
1800 case BOND_MODE_8023AD:
1801 /* in 802.3ad mode, the internal mechanism
1802 * will activate the slaves in the selected
1805 bond_set_slave_inactive_flags(new_slave);
1806 /* if this is the first slave */
1807 if (bond->slave_cnt == 1) {
1808 SLAVE_AD_INFO(new_slave).id = 1;
1809 /* Initialize AD with the number of times that the AD timer is called in 1 second
1810 * can be called only after the mac address of the bond is set
1812 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1814 SLAVE_AD_INFO(new_slave).id =
1815 SLAVE_AD_INFO(new_slave->prev).id + 1;
1818 bond_3ad_bind_slave(new_slave);
1822 bond_set_active_slave(new_slave);
1823 bond_set_slave_inactive_flags(new_slave);
1824 bond_select_active_slave(bond);
1827 pr_debug("This slave is always active in trunk mode\n");
1829 /* always active in trunk mode */
1830 bond_set_active_slave(new_slave);
1832 /* In trunking mode there is little meaning to curr_active_slave
1833 * anyway (it holds no special properties of the bond device),
1834 * so we can change it without calling change_active_interface()
1836 if (!bond->curr_active_slave)
1837 bond->curr_active_slave = new_slave;
1840 } /* switch(bond_mode) */
1842 write_unlock_bh(&bond->curr_slave_lock);
1844 bond_set_carrier(bond);
1846 #ifdef CONFIG_NET_POLL_CONTROLLER
1847 slave_dev->npinfo = bond_netpoll_info(bond);
1848 if (slave_dev->npinfo) {
1849 if (slave_enable_netpoll(new_slave)) {
1850 read_unlock(&bond->lock);
1851 pr_info("Error, %s: master_dev is using netpoll, "
1852 "but new slave device does not support netpoll.\n",
1860 read_unlock(&bond->lock);
1862 res = bond_create_slave_symlinks(bond_dev, slave_dev);
1866 res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1869 pr_debug("Error %d calling netdev_rx_handler_register\n", res);
1870 goto err_dest_symlinks;
1873 pr_info("%s: enslaving %s as a%s interface with a%s link.\n",
1874 bond_dev->name, slave_dev->name,
1875 bond_is_active_slave(new_slave) ? "n active" : " backup",
1876 new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1878 /* enslave is successful */
1881 /* Undo stages on error */
1883 bond_destroy_slave_symlinks(bond_dev, slave_dev);
1886 write_lock_bh(&bond->lock);
1887 bond_detach_slave(bond, new_slave);
1888 write_unlock_bh(&bond->lock);
1891 dev_close(slave_dev);
1894 netdev_set_bond_master(slave_dev, NULL);
1897 if (!bond->params.fail_over_mac) {
1898 /* XXX TODO - fom follow mode needs to change master's
1899 * MAC if this slave's MAC is in use by the bond, or at
1900 * least print a warning.
1902 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1903 addr.sa_family = slave_dev->type;
1904 dev_set_mac_address(slave_dev, &addr);
1908 dev_set_mtu(slave_dev, new_slave->original_mtu);
1914 bond_compute_features(bond);
1920 * Try to release the slave device <slave> from the bond device <master>
1921 * It is legal to access curr_active_slave without a lock because all the function
1924 * The rules for slave state should be:
1925 * for Active/Backup:
1926 * Active stays on all backups go down
1927 * for Bonded connections:
1928 * The first up interface should be left on and all others downed.
1930 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1932 struct bonding *bond = netdev_priv(bond_dev);
1933 struct slave *slave, *oldcurrent;
1934 struct sockaddr addr;
1935 netdev_features_t old_features = bond_dev->features;
1937 /* slave is not a slave or master is not master of this slave */
1938 if (!(slave_dev->flags & IFF_SLAVE) ||
1939 (slave_dev->master != bond_dev)) {
1940 pr_err("%s: Error: cannot release %s.\n",
1941 bond_dev->name, slave_dev->name);
1946 netdev_bonding_change(bond_dev, NETDEV_RELEASE);
1947 write_lock_bh(&bond->lock);
1949 slave = bond_get_slave_by_dev(bond, slave_dev);
1951 /* not a slave of this bond */
1952 pr_info("%s: %s not enslaved\n",
1953 bond_dev->name, slave_dev->name);
1954 write_unlock_bh(&bond->lock);
1955 unblock_netpoll_tx();
1959 /* unregister rx_handler early so bond_handle_frame wouldn't be called
1960 * for this slave anymore.
1962 netdev_rx_handler_unregister(slave_dev);
1963 write_unlock_bh(&bond->lock);
1965 write_lock_bh(&bond->lock);
1967 if (!bond->params.fail_over_mac) {
1968 if (ether_addr_equal(bond_dev->dev_addr, slave->perm_hwaddr) &&
1969 bond->slave_cnt > 1)
1970 pr_warning("%s: Warning: the permanent HWaddr of %s - %pM - is still in use by %s. Set the HWaddr of %s to a different address to avoid conflicts.\n",
1971 bond_dev->name, slave_dev->name,
1973 bond_dev->name, slave_dev->name);
1976 /* Inform AD package of unbinding of slave. */
1977 if (bond->params.mode == BOND_MODE_8023AD) {
1978 /* must be called before the slave is
1979 * detached from the list
1981 bond_3ad_unbind_slave(slave);
1984 pr_info("%s: releasing %s interface %s\n",
1986 bond_is_active_slave(slave) ? "active" : "backup",
1989 oldcurrent = bond->curr_active_slave;
1991 bond->current_arp_slave = NULL;
1993 /* release the slave from its bond */
1994 bond_detach_slave(bond, slave);
1996 if (bond->primary_slave == slave)
1997 bond->primary_slave = NULL;
1999 if (oldcurrent == slave)
2000 bond_change_active_slave(bond, NULL);
2002 if (bond_is_lb(bond)) {
2003 /* Must be called only after the slave has been
2004 * detached from the list and the curr_active_slave
2005 * has been cleared (if our_slave == old_current),
2006 * but before a new active slave is selected.
2008 write_unlock_bh(&bond->lock);
2009 bond_alb_deinit_slave(bond, slave);
2010 write_lock_bh(&bond->lock);
2013 if (oldcurrent == slave) {
2015 * Note that we hold RTNL over this sequence, so there
2016 * is no concern that another slave add/remove event
2019 write_unlock_bh(&bond->lock);
2020 read_lock(&bond->lock);
2021 write_lock_bh(&bond->curr_slave_lock);
2023 bond_select_active_slave(bond);
2025 write_unlock_bh(&bond->curr_slave_lock);
2026 read_unlock(&bond->lock);
2027 write_lock_bh(&bond->lock);
2030 if (bond->slave_cnt == 0) {
2031 bond_set_carrier(bond);
2033 /* if the last slave was removed, zero the mac address
2034 * of the master so it will be set by the application
2035 * to the mac address of the first slave
2037 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
2039 if (bond_vlan_used(bond)) {
2040 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
2041 bond_dev->name, bond_dev->name);
2042 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
2047 write_unlock_bh(&bond->lock);
2048 unblock_netpoll_tx();
2050 if (bond->slave_cnt == 0)
2051 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
2053 bond_compute_features(bond);
2054 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
2055 (old_features & NETIF_F_VLAN_CHALLENGED))
2056 pr_info("%s: last VLAN challenged slave %s left bond %s. VLAN blocking is removed\n",
2057 bond_dev->name, slave_dev->name, bond_dev->name);
2059 /* must do this from outside any spinlocks */
2060 bond_destroy_slave_symlinks(bond_dev, slave_dev);
2062 bond_del_vlans_from_slave(bond, slave_dev);
2064 /* If the mode USES_PRIMARY, then we should only remove its
2065 * promisc and mc settings if it was the curr_active_slave, but that was
2066 * already taken care of above when we detached the slave
2068 if (!USES_PRIMARY(bond->params.mode)) {
2069 /* unset promiscuity level from slave */
2070 if (bond_dev->flags & IFF_PROMISC)
2071 dev_set_promiscuity(slave_dev, -1);
2073 /* unset allmulti level from slave */
2074 if (bond_dev->flags & IFF_ALLMULTI)
2075 dev_set_allmulti(slave_dev, -1);
2077 /* flush master's mc_list from slave */
2078 netif_addr_lock_bh(bond_dev);
2079 bond_mc_list_flush(bond_dev, slave_dev);
2080 netif_addr_unlock_bh(bond_dev);
2083 netdev_set_bond_master(slave_dev, NULL);
2085 slave_disable_netpoll(slave);
2087 /* close slave before restoring its mac address */
2088 dev_close(slave_dev);
2090 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
2091 /* restore original ("permanent") mac address */
2092 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2093 addr.sa_family = slave_dev->type;
2094 dev_set_mac_address(slave_dev, &addr);
2097 dev_set_mtu(slave_dev, slave->original_mtu);
2099 slave_dev->priv_flags &= ~IFF_BONDING;
2103 return 0; /* deletion OK */
2107 * First release a slave and then destroy the bond if no more slaves are left.
2108 * Must be under rtnl_lock when this function is called.
2110 static int bond_release_and_destroy(struct net_device *bond_dev,
2111 struct net_device *slave_dev)
2113 struct bonding *bond = netdev_priv(bond_dev);
2116 ret = bond_release(bond_dev, slave_dev);
2117 if ((ret == 0) && (bond->slave_cnt == 0)) {
2118 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
2119 pr_info("%s: destroying bond %s.\n",
2120 bond_dev->name, bond_dev->name);
2121 unregister_netdevice(bond_dev);
2127 * This function releases all slaves.
2129 static int bond_release_all(struct net_device *bond_dev)
2131 struct bonding *bond = netdev_priv(bond_dev);
2132 struct slave *slave;
2133 struct net_device *slave_dev;
2134 struct sockaddr addr;
2136 write_lock_bh(&bond->lock);
2138 netif_carrier_off(bond_dev);
2140 if (bond->slave_cnt == 0)
2143 bond->current_arp_slave = NULL;
2144 bond->primary_slave = NULL;
2145 bond_change_active_slave(bond, NULL);
2147 while ((slave = bond->first_slave) != NULL) {
2148 /* Inform AD package of unbinding of slave
2149 * before slave is detached from the list.
2151 if (bond->params.mode == BOND_MODE_8023AD)
2152 bond_3ad_unbind_slave(slave);
2154 slave_dev = slave->dev;
2155 bond_detach_slave(bond, slave);
2157 /* now that the slave is detached, unlock and perform
2158 * all the undo steps that should not be called from
2161 write_unlock_bh(&bond->lock);
2163 /* unregister rx_handler early so bond_handle_frame wouldn't
2164 * be called for this slave anymore.
2166 netdev_rx_handler_unregister(slave_dev);
2169 if (bond_is_lb(bond)) {
2170 /* must be called only after the slave
2171 * has been detached from the list
2173 bond_alb_deinit_slave(bond, slave);
2176 bond_destroy_slave_symlinks(bond_dev, slave_dev);
2177 bond_del_vlans_from_slave(bond, slave_dev);
2179 /* If the mode USES_PRIMARY, then we should only remove its
2180 * promisc and mc settings if it was the curr_active_slave, but that was
2181 * already taken care of above when we detached the slave
2183 if (!USES_PRIMARY(bond->params.mode)) {
2184 /* unset promiscuity level from slave */
2185 if (bond_dev->flags & IFF_PROMISC)
2186 dev_set_promiscuity(slave_dev, -1);
2188 /* unset allmulti level from slave */
2189 if (bond_dev->flags & IFF_ALLMULTI)
2190 dev_set_allmulti(slave_dev, -1);
2192 /* flush master's mc_list from slave */
2193 netif_addr_lock_bh(bond_dev);
2194 bond_mc_list_flush(bond_dev, slave_dev);
2195 netif_addr_unlock_bh(bond_dev);
2198 netdev_set_bond_master(slave_dev, NULL);
2200 slave_disable_netpoll(slave);
2202 /* close slave before restoring its mac address */
2203 dev_close(slave_dev);
2205 if (!bond->params.fail_over_mac) {
2206 /* restore original ("permanent") mac address*/
2207 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2208 addr.sa_family = slave_dev->type;
2209 dev_set_mac_address(slave_dev, &addr);
2214 /* re-acquire the lock before getting the next slave */
2215 write_lock_bh(&bond->lock);
2218 /* zero the mac address of the master so it will be
2219 * set by the application to the mac address of the
2222 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
2224 if (bond_vlan_used(bond)) {
2225 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
2226 bond_dev->name, bond_dev->name);
2227 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
2231 pr_info("%s: released all slaves\n", bond_dev->name);
2234 write_unlock_bh(&bond->lock);
2236 bond_compute_features(bond);
2242 * This function changes the active slave to slave <slave_dev>.
2243 * It returns -EINVAL in the following cases.
2244 * - <slave_dev> is not found in the list.
2245 * - There is not active slave now.
2246 * - <slave_dev> is already active.
2247 * - The link state of <slave_dev> is not BOND_LINK_UP.
2248 * - <slave_dev> is not running.
2249 * In these cases, this function does nothing.
2250 * In the other cases, current_slave pointer is changed and 0 is returned.
2252 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
2254 struct bonding *bond = netdev_priv(bond_dev);
2255 struct slave *old_active = NULL;
2256 struct slave *new_active = NULL;
2259 if (!USES_PRIMARY(bond->params.mode))
2262 /* Verify that master_dev is indeed the master of slave_dev */
2263 if (!(slave_dev->flags & IFF_SLAVE) || (slave_dev->master != bond_dev))
2266 read_lock(&bond->lock);
2268 read_lock(&bond->curr_slave_lock);
2269 old_active = bond->curr_active_slave;
2270 read_unlock(&bond->curr_slave_lock);
2272 new_active = bond_get_slave_by_dev(bond, slave_dev);
2275 * Changing to the current active: do nothing; return success.
2277 if (new_active && (new_active == old_active)) {
2278 read_unlock(&bond->lock);
2284 (new_active->link == BOND_LINK_UP) &&
2285 IS_UP(new_active->dev)) {
2287 write_lock_bh(&bond->curr_slave_lock);
2288 bond_change_active_slave(bond, new_active);
2289 write_unlock_bh(&bond->curr_slave_lock);
2290 unblock_netpoll_tx();
2294 read_unlock(&bond->lock);
2299 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2301 struct bonding *bond = netdev_priv(bond_dev);
2303 info->bond_mode = bond->params.mode;
2304 info->miimon = bond->params.miimon;
2306 read_lock(&bond->lock);
2307 info->num_slaves = bond->slave_cnt;
2308 read_unlock(&bond->lock);
2313 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2315 struct bonding *bond = netdev_priv(bond_dev);
2316 struct slave *slave;
2317 int i, res = -ENODEV;
2319 read_lock(&bond->lock);
2321 bond_for_each_slave(bond, slave, i) {
2322 if (i == (int)info->slave_id) {
2324 strcpy(info->slave_name, slave->dev->name);
2325 info->link = slave->link;
2326 info->state = bond_slave_state(slave);
2327 info->link_failure_count = slave->link_failure_count;
2332 read_unlock(&bond->lock);
2337 /*-------------------------------- Monitoring -------------------------------*/
2340 static int bond_miimon_inspect(struct bonding *bond)
2342 struct slave *slave;
2343 int i, link_state, commit = 0;
2344 bool ignore_updelay;
2346 ignore_updelay = !bond->curr_active_slave ? true : false;
2348 bond_for_each_slave(bond, slave, i) {
2349 slave->new_link = BOND_LINK_NOCHANGE;
2351 link_state = bond_check_dev_link(bond, slave->dev, 0);
2353 switch (slave->link) {
2358 slave->link = BOND_LINK_FAIL;
2359 slave->delay = bond->params.downdelay;
2361 pr_info("%s: link status down for %sinterface %s, disabling it in %d ms.\n",
2363 (bond->params.mode ==
2364 BOND_MODE_ACTIVEBACKUP) ?
2365 (bond_is_active_slave(slave) ?
2366 "active " : "backup ") : "",
2368 bond->params.downdelay * bond->params.miimon);
2371 case BOND_LINK_FAIL:
2374 * recovered before downdelay expired
2376 slave->link = BOND_LINK_UP;
2377 slave->jiffies = jiffies;
2378 pr_info("%s: link status up again after %d ms for interface %s.\n",
2380 (bond->params.downdelay - slave->delay) *
2381 bond->params.miimon,
2386 if (slave->delay <= 0) {
2387 slave->new_link = BOND_LINK_DOWN;
2395 case BOND_LINK_DOWN:
2399 slave->link = BOND_LINK_BACK;
2400 slave->delay = bond->params.updelay;
2403 pr_info("%s: link status up for interface %s, enabling it in %d ms.\n",
2404 bond->dev->name, slave->dev->name,
2405 ignore_updelay ? 0 :
2406 bond->params.updelay *
2407 bond->params.miimon);
2410 case BOND_LINK_BACK:
2412 slave->link = BOND_LINK_DOWN;
2413 pr_info("%s: link status down again after %d ms for interface %s.\n",
2415 (bond->params.updelay - slave->delay) *
2416 bond->params.miimon,
2425 if (slave->delay <= 0) {
2426 slave->new_link = BOND_LINK_UP;
2428 ignore_updelay = false;
2440 static void bond_miimon_commit(struct bonding *bond)
2442 struct slave *slave;
2445 bond_for_each_slave(bond, slave, i) {
2446 switch (slave->new_link) {
2447 case BOND_LINK_NOCHANGE:
2451 slave->link = BOND_LINK_UP;
2452 slave->jiffies = jiffies;
2454 if (bond->params.mode == BOND_MODE_8023AD) {
2455 /* prevent it from being the active one */
2456 bond_set_backup_slave(slave);
2457 } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2458 /* make it immediately active */
2459 bond_set_active_slave(slave);
2460 } else if (slave != bond->primary_slave) {
2461 /* prevent it from being the active one */
2462 bond_set_backup_slave(slave);
2465 bond_update_speed_duplex(slave);
2467 pr_info("%s: link status definitely up for interface %s, %u Mbps %s duplex.\n",
2468 bond->dev->name, slave->dev->name,
2469 slave->speed, slave->duplex ? "full" : "half");
2471 /* notify ad that the link status has changed */
2472 if (bond->params.mode == BOND_MODE_8023AD)
2473 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2475 if (bond_is_lb(bond))
2476 bond_alb_handle_link_change(bond, slave,
2479 if (!bond->curr_active_slave ||
2480 (slave == bond->primary_slave))
2485 case BOND_LINK_DOWN:
2486 if (slave->link_failure_count < UINT_MAX)
2487 slave->link_failure_count++;
2489 slave->link = BOND_LINK_DOWN;
2491 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
2492 bond->params.mode == BOND_MODE_8023AD)
2493 bond_set_slave_inactive_flags(slave);
2495 pr_info("%s: link status definitely down for interface %s, disabling it\n",
2496 bond->dev->name, slave->dev->name);
2498 if (bond->params.mode == BOND_MODE_8023AD)
2499 bond_3ad_handle_link_change(slave,
2502 if (bond_is_lb(bond))
2503 bond_alb_handle_link_change(bond, slave,
2506 if (slave == bond->curr_active_slave)
2512 pr_err("%s: invalid new link %d on slave %s\n",
2513 bond->dev->name, slave->new_link,
2515 slave->new_link = BOND_LINK_NOCHANGE;
2523 write_lock_bh(&bond->curr_slave_lock);
2524 bond_select_active_slave(bond);
2525 write_unlock_bh(&bond->curr_slave_lock);
2526 unblock_netpoll_tx();
2529 bond_set_carrier(bond);
2535 * Really a wrapper that splits the mii monitor into two phases: an
2536 * inspection, then (if inspection indicates something needs to be done)
2537 * an acquisition of appropriate locks followed by a commit phase to
2538 * implement whatever link state changes are indicated.
2540 void bond_mii_monitor(struct work_struct *work)
2542 struct bonding *bond = container_of(work, struct bonding,
2544 bool should_notify_peers = false;
2545 unsigned long delay;
2547 read_lock(&bond->lock);
2549 delay = msecs_to_jiffies(bond->params.miimon);
2551 if (bond->slave_cnt == 0)
2554 should_notify_peers = bond_should_notify_peers(bond);
2556 if (bond_miimon_inspect(bond)) {
2557 read_unlock(&bond->lock);
2559 /* Race avoidance with bond_close cancel of workqueue */
2560 if (!rtnl_trylock()) {
2561 read_lock(&bond->lock);
2563 should_notify_peers = false;
2567 read_lock(&bond->lock);
2569 bond_miimon_commit(bond);
2571 read_unlock(&bond->lock);
2572 rtnl_unlock(); /* might sleep, hold no other locks */
2573 read_lock(&bond->lock);
2577 if (bond->params.miimon)
2578 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2580 read_unlock(&bond->lock);
2582 if (should_notify_peers) {
2583 if (!rtnl_trylock()) {
2584 read_lock(&bond->lock);
2585 bond->send_peer_notif++;
2586 read_unlock(&bond->lock);
2589 netdev_bonding_change(bond->dev, NETDEV_NOTIFY_PEERS);
2594 static int bond_has_this_ip(struct bonding *bond, __be32 ip)
2596 struct vlan_entry *vlan;
2597 struct net_device *vlan_dev;
2599 if (ip == bond_confirm_addr(bond->dev, 0, ip))
2602 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2604 vlan_dev = __vlan_find_dev_deep(bond->dev, vlan->vlan_id);
2606 if (vlan_dev && ip == bond_confirm_addr(vlan_dev, 0, ip))
2614 * We go to the (large) trouble of VLAN tagging ARP frames because
2615 * switches in VLAN mode (especially if ports are configured as
2616 * "native" to a VLAN) might not pass non-tagged frames.
2618 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2620 struct sk_buff *skb;
2622 pr_debug("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2623 slave_dev->name, dest_ip, src_ip, vlan_id);
2625 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2626 NULL, slave_dev->dev_addr, NULL);
2629 pr_err("ARP packet allocation failed\n");
2633 skb = vlan_put_tag(skb, vlan_id);
2635 pr_err("failed to insert VLAN tag\n");
2643 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2646 __be32 *targets = bond->params.arp_targets;
2647 struct vlan_entry *vlan;
2648 struct net_device *vlan_dev = NULL;
2651 for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2655 pr_debug("basa: target %x\n", targets[i]);
2656 if (!bond_vlan_used(bond)) {
2657 pr_debug("basa: empty vlan: arp_send\n");
2658 addr = bond_confirm_addr(bond->dev, targets[i], 0);
2659 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2665 * If VLANs are configured, we do a route lookup to
2666 * determine which VLAN interface would be used, so we
2667 * can tag the ARP with the proper VLAN tag.
2669 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2672 if (net_ratelimit()) {
2673 pr_warning("%s: no route to arp_ip_target %pI4\n",
2674 bond->dev->name, &targets[i]);
2680 * This target is not on a VLAN
2682 if (rt->dst.dev == bond->dev) {
2684 pr_debug("basa: rtdev == bond->dev: arp_send\n");
2685 addr = bond_confirm_addr(bond->dev, targets[i], 0);
2686 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2692 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2694 vlan_dev = __vlan_find_dev_deep(bond->dev,
2697 if (vlan_dev == rt->dst.dev) {
2698 vlan_id = vlan->vlan_id;
2699 pr_debug("basa: vlan match on %s %d\n",
2700 vlan_dev->name, vlan_id);
2705 if (vlan_id && vlan_dev) {
2707 addr = bond_confirm_addr(vlan_dev, targets[i], 0);
2708 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2713 if (net_ratelimit()) {
2714 pr_warning("%s: no path to arp_ip_target %pI4 via rt.dev %s\n",
2715 bond->dev->name, &targets[i],
2716 rt->dst.dev ? rt->dst.dev->name : "NULL");
2722 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2725 __be32 *targets = bond->params.arp_targets;
2727 for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2728 pr_debug("bva: sip %pI4 tip %pI4 t[%d] %pI4 bhti(tip) %d\n",
2729 &sip, &tip, i, &targets[i],
2730 bond_has_this_ip(bond, tip));
2731 if (sip == targets[i]) {
2732 if (bond_has_this_ip(bond, tip))
2733 slave->last_arp_rx = jiffies;
2739 static int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2740 struct slave *slave)
2742 struct arphdr *arp = (struct arphdr *)skb->data;
2743 unsigned char *arp_ptr;
2747 if (skb->protocol != __cpu_to_be16(ETH_P_ARP))
2748 return RX_HANDLER_ANOTHER;
2750 read_lock(&bond->lock);
2751 alen = arp_hdr_len(bond->dev);
2753 pr_debug("bond_arp_rcv: bond %s skb->dev %s\n",
2754 bond->dev->name, skb->dev->name);
2756 if (alen > skb_headlen(skb)) {
2757 arp = kmalloc(alen, GFP_ATOMIC);
2760 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2764 if (arp->ar_hln != bond->dev->addr_len ||
2765 skb->pkt_type == PACKET_OTHERHOST ||
2766 skb->pkt_type == PACKET_LOOPBACK ||
2767 arp->ar_hrd != htons(ARPHRD_ETHER) ||
2768 arp->ar_pro != htons(ETH_P_IP) ||
2772 arp_ptr = (unsigned char *)(arp + 1);
2773 arp_ptr += bond->dev->addr_len;
2774 memcpy(&sip, arp_ptr, 4);
2775 arp_ptr += 4 + bond->dev->addr_len;
2776 memcpy(&tip, arp_ptr, 4);
2778 pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2779 bond->dev->name, slave->dev->name, bond_slave_state(slave),
2780 bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2784 * Backup slaves won't see the ARP reply, but do come through
2785 * here for each ARP probe (so we swap the sip/tip to validate
2786 * the probe). In a "redundant switch, common router" type of
2787 * configuration, the ARP probe will (hopefully) travel from
2788 * the active, through one switch, the router, then the other
2789 * switch before reaching the backup.
2791 if (bond_is_active_slave(slave))
2792 bond_validate_arp(bond, slave, sip, tip);
2794 bond_validate_arp(bond, slave, tip, sip);
2797 read_unlock(&bond->lock);
2798 if (arp != (struct arphdr *)skb->data)
2800 return RX_HANDLER_ANOTHER;
2804 * this function is called regularly to monitor each slave's link
2805 * ensuring that traffic is being sent and received when arp monitoring
2806 * is used in load-balancing mode. if the adapter has been dormant, then an
2807 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2808 * arp monitoring in active backup mode.
2810 void bond_loadbalance_arp_mon(struct work_struct *work)
2812 struct bonding *bond = container_of(work, struct bonding,
2814 struct slave *slave, *oldcurrent;
2815 int do_failover = 0;
2819 read_lock(&bond->lock);
2821 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2823 if (bond->slave_cnt == 0)
2826 read_lock(&bond->curr_slave_lock);
2827 oldcurrent = bond->curr_active_slave;
2828 read_unlock(&bond->curr_slave_lock);
2830 /* see if any of the previous devices are up now (i.e. they have
2831 * xmt and rcv traffic). the curr_active_slave does not come into
2832 * the picture unless it is null. also, slave->jiffies is not needed
2833 * here because we send an arp on each slave and give a slave as
2834 * long as it needs to get the tx/rx within the delta.
2835 * TODO: what about up/down delay in arp mode? it wasn't here before
2838 bond_for_each_slave(bond, slave, i) {
2839 unsigned long trans_start = dev_trans_start(slave->dev);
2841 if (slave->link != BOND_LINK_UP) {
2842 if (time_in_range(jiffies,
2843 trans_start - delta_in_ticks,
2844 trans_start + delta_in_ticks) &&
2845 time_in_range(jiffies,
2846 slave->dev->last_rx - delta_in_ticks,
2847 slave->dev->last_rx + delta_in_ticks)) {
2849 slave->link = BOND_LINK_UP;
2850 bond_set_active_slave(slave);
2852 /* primary_slave has no meaning in round-robin
2853 * mode. the window of a slave being up and
2854 * curr_active_slave being null after enslaving
2858 pr_info("%s: link status definitely up for interface %s, ",
2863 pr_info("%s: interface %s is now up\n",
2869 /* slave->link == BOND_LINK_UP */
2871 /* not all switches will respond to an arp request
2872 * when the source ip is 0, so don't take the link down
2873 * if we don't know our ip yet
2875 if (!time_in_range(jiffies,
2876 trans_start - delta_in_ticks,
2877 trans_start + 2 * delta_in_ticks) ||
2878 !time_in_range(jiffies,
2879 slave->dev->last_rx - delta_in_ticks,
2880 slave->dev->last_rx + 2 * delta_in_ticks)) {
2882 slave->link = BOND_LINK_DOWN;
2883 bond_set_backup_slave(slave);
2885 if (slave->link_failure_count < UINT_MAX)
2886 slave->link_failure_count++;
2888 pr_info("%s: interface %s is now down.\n",
2892 if (slave == oldcurrent)
2897 /* note: if switch is in round-robin mode, all links
2898 * must tx arp to ensure all links rx an arp - otherwise
2899 * links may oscillate or not come up at all; if switch is
2900 * in something like xor mode, there is nothing we can
2901 * do - all replies will be rx'ed on same link causing slaves
2902 * to be unstable during low/no traffic periods
2904 if (IS_UP(slave->dev))
2905 bond_arp_send_all(bond, slave);
2910 write_lock_bh(&bond->curr_slave_lock);
2912 bond_select_active_slave(bond);
2914 write_unlock_bh(&bond->curr_slave_lock);
2915 unblock_netpoll_tx();
2919 if (bond->params.arp_interval)
2920 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2922 read_unlock(&bond->lock);
2926 * Called to inspect slaves for active-backup mode ARP monitor link state
2927 * changes. Sets new_link in slaves to specify what action should take
2928 * place for the slave. Returns 0 if no changes are found, >0 if changes
2929 * to link states must be committed.
2931 * Called with bond->lock held for read.
2933 static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks)
2935 struct slave *slave;
2937 unsigned long trans_start;
2939 bond_for_each_slave(bond, slave, i) {
2940 slave->new_link = BOND_LINK_NOCHANGE;
2942 if (slave->link != BOND_LINK_UP) {
2943 if (time_in_range(jiffies,
2944 slave_last_rx(bond, slave) - delta_in_ticks,
2945 slave_last_rx(bond, slave) + delta_in_ticks)) {
2947 slave->new_link = BOND_LINK_UP;
2955 * Give slaves 2*delta after being enslaved or made
2956 * active. This avoids bouncing, as the last receive
2957 * times need a full ARP monitor cycle to be updated.
2959 if (time_in_range(jiffies,
2960 slave->jiffies - delta_in_ticks,
2961 slave->jiffies + 2 * delta_in_ticks))
2965 * Backup slave is down if:
2966 * - No current_arp_slave AND
2967 * - more than 3*delta since last receive AND
2968 * - the bond has an IP address
2970 * Note: a non-null current_arp_slave indicates
2971 * the curr_active_slave went down and we are
2972 * searching for a new one; under this condition
2973 * we only take the curr_active_slave down - this
2974 * gives each slave a chance to tx/rx traffic
2975 * before being taken out
2977 if (!bond_is_active_slave(slave) &&
2978 !bond->current_arp_slave &&
2979 !time_in_range(jiffies,
2980 slave_last_rx(bond, slave) - delta_in_ticks,
2981 slave_last_rx(bond, slave) + 3 * delta_in_ticks)) {
2983 slave->new_link = BOND_LINK_DOWN;
2988 * Active slave is down if:
2989 * - more than 2*delta since transmitting OR
2990 * - (more than 2*delta since receive AND
2991 * the bond has an IP address)
2993 trans_start = dev_trans_start(slave->dev);
2994 if (bond_is_active_slave(slave) &&
2995 (!time_in_range(jiffies,
2996 trans_start - delta_in_ticks,
2997 trans_start + 2 * delta_in_ticks) ||
2998 !time_in_range(jiffies,
2999 slave_last_rx(bond, slave) - delta_in_ticks,
3000 slave_last_rx(bond, slave) + 2 * delta_in_ticks))) {
3002 slave->new_link = BOND_LINK_DOWN;
3011 * Called to commit link state changes noted by inspection step of
3012 * active-backup mode ARP monitor.
3014 * Called with RTNL and bond->lock for read.
3016 static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks)
3018 struct slave *slave;
3020 unsigned long trans_start;
3022 bond_for_each_slave(bond, slave, i) {
3023 switch (slave->new_link) {
3024 case BOND_LINK_NOCHANGE:
3028 trans_start = dev_trans_start(slave->dev);
3029 if ((!bond->curr_active_slave &&
3030 time_in_range(jiffies,
3031 trans_start - delta_in_ticks,
3032 trans_start + delta_in_ticks)) ||
3033 bond->curr_active_slave != slave) {
3034 slave->link = BOND_LINK_UP;
3035 if (bond->current_arp_slave) {
3036 bond_set_slave_inactive_flags(
3037 bond->current_arp_slave);
3038 bond->current_arp_slave = NULL;
3041 pr_info("%s: link status definitely up for interface %s.\n",
3042 bond->dev->name, slave->dev->name);
3044 if (!bond->curr_active_slave ||
3045 (slave == bond->primary_slave))
3052 case BOND_LINK_DOWN:
3053 if (slave->link_failure_count < UINT_MAX)
3054 slave->link_failure_count++;
3056 slave->link = BOND_LINK_DOWN;
3057 bond_set_slave_inactive_flags(slave);
3059 pr_info("%s: link status definitely down for interface %s, disabling it\n",
3060 bond->dev->name, slave->dev->name);
3062 if (slave == bond->curr_active_slave) {
3063 bond->current_arp_slave = NULL;
3070 pr_err("%s: impossible: new_link %d on slave %s\n",
3071 bond->dev->name, slave->new_link,
3079 write_lock_bh(&bond->curr_slave_lock);
3080 bond_select_active_slave(bond);
3081 write_unlock_bh(&bond->curr_slave_lock);
3082 unblock_netpoll_tx();
3085 bond_set_carrier(bond);
3089 * Send ARP probes for active-backup mode ARP monitor.
3091 * Called with bond->lock held for read.
3093 static void bond_ab_arp_probe(struct bonding *bond)
3095 struct slave *slave;
3098 read_lock(&bond->curr_slave_lock);
3100 if (bond->current_arp_slave && bond->curr_active_slave)
3101 pr_info("PROBE: c_arp %s && cas %s BAD\n",
3102 bond->current_arp_slave->dev->name,
3103 bond->curr_active_slave->dev->name);
3105 if (bond->curr_active_slave) {
3106 bond_arp_send_all(bond, bond->curr_active_slave);
3107 read_unlock(&bond->curr_slave_lock);
3111 read_unlock(&bond->curr_slave_lock);
3113 /* if we don't have a curr_active_slave, search for the next available
3114 * backup slave from the current_arp_slave and make it the candidate
3115 * for becoming the curr_active_slave
3118 if (!bond->current_arp_slave) {
3119 bond->current_arp_slave = bond->first_slave;
3120 if (!bond->current_arp_slave)
3124 bond_set_slave_inactive_flags(bond->current_arp_slave);
3126 /* search for next candidate */
3127 bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
3128 if (IS_UP(slave->dev)) {
3129 slave->link = BOND_LINK_BACK;
3130 bond_set_slave_active_flags(slave);
3131 bond_arp_send_all(bond, slave);
3132 slave->jiffies = jiffies;
3133 bond->current_arp_slave = slave;
3137 /* if the link state is up at this point, we
3138 * mark it down - this can happen if we have
3139 * simultaneous link failures and
3140 * reselect_active_interface doesn't make this
3141 * one the current slave so it is still marked
3142 * up when it is actually down
3144 if (slave->link == BOND_LINK_UP) {
3145 slave->link = BOND_LINK_DOWN;
3146 if (slave->link_failure_count < UINT_MAX)
3147 slave->link_failure_count++;
3149 bond_set_slave_inactive_flags(slave);
3151 pr_info("%s: backup interface %s is now down.\n",
3152 bond->dev->name, slave->dev->name);
3157 void bond_activebackup_arp_mon(struct work_struct *work)
3159 struct bonding *bond = container_of(work, struct bonding,
3161 bool should_notify_peers = false;
3164 read_lock(&bond->lock);
3166 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3168 if (bond->slave_cnt == 0)
3171 should_notify_peers = bond_should_notify_peers(bond);
3173 if (bond_ab_arp_inspect(bond, delta_in_ticks)) {
3174 read_unlock(&bond->lock);
3176 /* Race avoidance with bond_close flush of workqueue */
3177 if (!rtnl_trylock()) {
3178 read_lock(&bond->lock);
3180 should_notify_peers = false;
3184 read_lock(&bond->lock);
3186 bond_ab_arp_commit(bond, delta_in_ticks);
3188 read_unlock(&bond->lock);
3190 read_lock(&bond->lock);
3193 bond_ab_arp_probe(bond);
3196 if (bond->params.arp_interval)
3197 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3199 read_unlock(&bond->lock);
3201 if (should_notify_peers) {
3202 if (!rtnl_trylock()) {
3203 read_lock(&bond->lock);
3204 bond->send_peer_notif++;
3205 read_unlock(&bond->lock);
3208 netdev_bonding_change(bond->dev, NETDEV_NOTIFY_PEERS);
3213 /*-------------------------- netdev event handling --------------------------*/
3216 * Change device name
3218 static int bond_event_changename(struct bonding *bond)
3220 bond_remove_proc_entry(bond);
3221 bond_create_proc_entry(bond);
3223 bond_debug_reregister(bond);
3228 static int bond_master_netdev_event(unsigned long event,
3229 struct net_device *bond_dev)
3231 struct bonding *event_bond = netdev_priv(bond_dev);
3234 case NETDEV_CHANGENAME:
3235 return bond_event_changename(event_bond);
3236 case NETDEV_UNREGISTER:
3237 bond_remove_proc_entry(event_bond);
3239 case NETDEV_REGISTER:
3240 bond_create_proc_entry(event_bond);
3249 static int bond_slave_netdev_event(unsigned long event,
3250 struct net_device *slave_dev)
3252 struct net_device *bond_dev = slave_dev->master;
3253 struct bonding *bond = netdev_priv(bond_dev);
3254 struct slave *slave = NULL;
3257 case NETDEV_UNREGISTER:
3259 if (bond->setup_by_slave)
3260 bond_release_and_destroy(bond_dev, slave_dev);
3262 bond_release(bond_dev, slave_dev);
3267 slave = bond_get_slave_by_dev(bond, slave_dev);
3269 u32 old_speed = slave->speed;
3270 u8 old_duplex = slave->duplex;
3272 bond_update_speed_duplex(slave);
3274 if (bond->params.mode == BOND_MODE_8023AD) {
3275 if (old_speed != slave->speed)
3276 bond_3ad_adapter_speed_changed(slave);
3277 if (old_duplex != slave->duplex)
3278 bond_3ad_adapter_duplex_changed(slave);
3285 * ... Or is it this?
3288 case NETDEV_CHANGEMTU:
3290 * TODO: Should slaves be allowed to
3291 * independently alter their MTU? For
3292 * an active-backup bond, slaves need
3293 * not be the same type of device, so
3294 * MTUs may vary. For other modes,
3295 * slaves arguably should have the
3296 * same MTUs. To do this, we'd need to
3297 * take over the slave's change_mtu
3298 * function for the duration of their
3302 case NETDEV_CHANGENAME:
3304 * TODO: handle changing the primary's name
3307 case NETDEV_FEAT_CHANGE:
3308 bond_compute_features(bond);
3318 * bond_netdev_event: handle netdev notifier chain events.
3320 * This function receives events for the netdev chain. The caller (an
3321 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3322 * locks for us to safely manipulate the slave devices (RTNL lock,
3325 static int bond_netdev_event(struct notifier_block *this,
3326 unsigned long event, void *ptr)
3328 struct net_device *event_dev = (struct net_device *)ptr;
3330 pr_debug("event_dev: %s, event: %lx\n",
3331 event_dev ? event_dev->name : "None",
3334 if (!(event_dev->priv_flags & IFF_BONDING))
3337 if (event_dev->flags & IFF_MASTER) {
3338 pr_debug("IFF_MASTER\n");
3339 return bond_master_netdev_event(event, event_dev);
3342 if (event_dev->flags & IFF_SLAVE) {
3343 pr_debug("IFF_SLAVE\n");
3344 return bond_slave_netdev_event(event, event_dev);
3350 static struct notifier_block bond_netdev_notifier = {
3351 .notifier_call = bond_netdev_event,
3354 /*---------------------------- Hashing Policies -----------------------------*/
3357 * Hash for the output device based upon layer 2 and layer 3 data. If
3358 * the packet is not IP mimic bond_xmit_hash_policy_l2()
3360 static int bond_xmit_hash_policy_l23(struct sk_buff *skb, int count)
3362 struct ethhdr *data = (struct ethhdr *)skb->data;
3363 struct iphdr *iph = ip_hdr(skb);
3365 if (skb->protocol == htons(ETH_P_IP)) {
3366 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^
3367 (data->h_dest[5] ^ data->h_source[5])) % count;
3370 return (data->h_dest[5] ^ data->h_source[5]) % count;
3374 * Hash for the output device based upon layer 3 and layer 4 data. If
3375 * the packet is a frag or not TCP or UDP, just use layer 3 data. If it is
3376 * altogether not IP, mimic bond_xmit_hash_policy_l2()
3378 static int bond_xmit_hash_policy_l34(struct sk_buff *skb, int count)
3380 struct ethhdr *data = (struct ethhdr *)skb->data;
3381 struct iphdr *iph = ip_hdr(skb);
3382 __be16 *layer4hdr = (__be16 *)((u32 *)iph + iph->ihl);
3385 if (skb->protocol == htons(ETH_P_IP)) {
3386 if (!ip_is_fragment(iph) &&
3387 (iph->protocol == IPPROTO_TCP ||
3388 iph->protocol == IPPROTO_UDP)) {
3389 layer4_xor = ntohs((*layer4hdr ^ *(layer4hdr + 1)));
3391 return (layer4_xor ^
3392 ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3396 return (data->h_dest[5] ^ data->h_source[5]) % count;
3400 * Hash for the output device based upon layer 2 data
3402 static int bond_xmit_hash_policy_l2(struct sk_buff *skb, int count)
3404 struct ethhdr *data = (struct ethhdr *)skb->data;
3406 return (data->h_dest[5] ^ data->h_source[5]) % count;
3409 /*-------------------------- Device entry points ----------------------------*/
3411 static int bond_open(struct net_device *bond_dev)
3413 struct bonding *bond = netdev_priv(bond_dev);
3414 struct slave *slave;
3417 /* reset slave->backup and slave->inactive */
3418 read_lock(&bond->lock);
3419 if (bond->slave_cnt > 0) {
3420 read_lock(&bond->curr_slave_lock);
3421 bond_for_each_slave(bond, slave, i) {
3422 if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3423 && (slave != bond->curr_active_slave)) {
3424 bond_set_slave_inactive_flags(slave);
3426 bond_set_slave_active_flags(slave);
3429 read_unlock(&bond->curr_slave_lock);
3431 read_unlock(&bond->lock);
3433 INIT_DELAYED_WORK(&bond->mcast_work, bond_resend_igmp_join_requests_delayed);
3435 if (bond_is_lb(bond)) {
3436 /* bond_alb_initialize must be called before the timer
3439 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
3440 /* something went wrong - fail the open operation */
3444 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3445 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3448 if (bond->params.miimon) { /* link check interval, in milliseconds. */
3449 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3450 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3453 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3454 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3455 INIT_DELAYED_WORK(&bond->arp_work,
3456 bond_activebackup_arp_mon);
3458 INIT_DELAYED_WORK(&bond->arp_work,
3459 bond_loadbalance_arp_mon);
3461 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3462 if (bond->params.arp_validate)
3463 bond->recv_probe = bond_arp_rcv;
3466 if (bond->params.mode == BOND_MODE_8023AD) {
3467 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3468 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3469 /* register to receive LACPDUs */
3470 bond->recv_probe = bond_3ad_lacpdu_recv;
3471 bond_3ad_initiate_agg_selection(bond, 1);
3477 static int bond_close(struct net_device *bond_dev)
3479 struct bonding *bond = netdev_priv(bond_dev);
3481 write_lock_bh(&bond->lock);
3483 bond->send_peer_notif = 0;
3485 write_unlock_bh(&bond->lock);
3487 if (bond->params.miimon) { /* link check interval, in milliseconds. */
3488 cancel_delayed_work_sync(&bond->mii_work);
3491 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3492 cancel_delayed_work_sync(&bond->arp_work);
3495 switch (bond->params.mode) {
3496 case BOND_MODE_8023AD:
3497 cancel_delayed_work_sync(&bond->ad_work);
3501 cancel_delayed_work_sync(&bond->alb_work);
3507 if (delayed_work_pending(&bond->mcast_work))
3508 cancel_delayed_work_sync(&bond->mcast_work);
3510 if (bond_is_lb(bond)) {
3511 /* Must be called only after all
3512 * slaves have been released
3514 bond_alb_deinitialize(bond);
3516 bond->recv_probe = NULL;
3521 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3522 struct rtnl_link_stats64 *stats)
3524 struct bonding *bond = netdev_priv(bond_dev);
3525 struct rtnl_link_stats64 temp;
3526 struct slave *slave;
3529 memset(stats, 0, sizeof(*stats));
3531 read_lock_bh(&bond->lock);
3533 bond_for_each_slave(bond, slave, i) {
3534 const struct rtnl_link_stats64 *sstats =
3535 dev_get_stats(slave->dev, &temp);
3537 stats->rx_packets += sstats->rx_packets;
3538 stats->rx_bytes += sstats->rx_bytes;
3539 stats->rx_errors += sstats->rx_errors;
3540 stats->rx_dropped += sstats->rx_dropped;
3542 stats->tx_packets += sstats->tx_packets;
3543 stats->tx_bytes += sstats->tx_bytes;
3544 stats->tx_errors += sstats->tx_errors;
3545 stats->tx_dropped += sstats->tx_dropped;
3547 stats->multicast += sstats->multicast;
3548 stats->collisions += sstats->collisions;
3550 stats->rx_length_errors += sstats->rx_length_errors;
3551 stats->rx_over_errors += sstats->rx_over_errors;
3552 stats->rx_crc_errors += sstats->rx_crc_errors;
3553 stats->rx_frame_errors += sstats->rx_frame_errors;
3554 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3555 stats->rx_missed_errors += sstats->rx_missed_errors;
3557 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3558 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3559 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3560 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3561 stats->tx_window_errors += sstats->tx_window_errors;
3564 read_unlock_bh(&bond->lock);
3569 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3571 struct net_device *slave_dev = NULL;
3572 struct ifbond k_binfo;
3573 struct ifbond __user *u_binfo = NULL;
3574 struct ifslave k_sinfo;
3575 struct ifslave __user *u_sinfo = NULL;
3576 struct mii_ioctl_data *mii = NULL;
3579 pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd);
3591 * We do this again just in case we were called by SIOCGMIIREG
3592 * instead of SIOCGMIIPHY.
3599 if (mii->reg_num == 1) {
3600 struct bonding *bond = netdev_priv(bond_dev);
3602 read_lock(&bond->lock);
3603 read_lock(&bond->curr_slave_lock);
3604 if (netif_carrier_ok(bond->dev))
3605 mii->val_out = BMSR_LSTATUS;
3607 read_unlock(&bond->curr_slave_lock);
3608 read_unlock(&bond->lock);
3612 case BOND_INFO_QUERY_OLD:
3613 case SIOCBONDINFOQUERY:
3614 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3616 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3619 res = bond_info_query(bond_dev, &k_binfo);
3621 copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3625 case BOND_SLAVE_INFO_QUERY_OLD:
3626 case SIOCBONDSLAVEINFOQUERY:
3627 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3629 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3632 res = bond_slave_info_query(bond_dev, &k_sinfo);
3634 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3643 if (!capable(CAP_NET_ADMIN))
3646 slave_dev = dev_get_by_name(dev_net(bond_dev), ifr->ifr_slave);
3648 pr_debug("slave_dev=%p:\n", slave_dev);
3653 pr_debug("slave_dev->name=%s:\n", slave_dev->name);
3655 case BOND_ENSLAVE_OLD:
3656 case SIOCBONDENSLAVE:
3657 res = bond_enslave(bond_dev, slave_dev);
3659 case BOND_RELEASE_OLD:
3660 case SIOCBONDRELEASE:
3661 res = bond_release(bond_dev, slave_dev);
3663 case BOND_SETHWADDR_OLD:
3664 case SIOCBONDSETHWADDR:
3665 res = bond_sethwaddr(bond_dev, slave_dev);
3667 case BOND_CHANGE_ACTIVE_OLD:
3668 case SIOCBONDCHANGEACTIVE:
3669 res = bond_ioctl_change_active(bond_dev, slave_dev);
3681 static bool bond_addr_in_mc_list(unsigned char *addr,
3682 struct netdev_hw_addr_list *list,
3685 struct netdev_hw_addr *ha;
3687 netdev_hw_addr_list_for_each(ha, list)
3688 if (!memcmp(ha->addr, addr, addrlen))
3694 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3696 struct bonding *bond = netdev_priv(bond_dev);
3698 if (change & IFF_PROMISC)
3699 bond_set_promiscuity(bond,
3700 bond_dev->flags & IFF_PROMISC ? 1 : -1);
3702 if (change & IFF_ALLMULTI)
3703 bond_set_allmulti(bond,
3704 bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3707 static void bond_set_multicast_list(struct net_device *bond_dev)
3709 struct bonding *bond = netdev_priv(bond_dev);
3710 struct netdev_hw_addr *ha;
3713 read_lock(&bond->lock);
3715 /* looking for addresses to add to slaves' mc list */
3716 netdev_for_each_mc_addr(ha, bond_dev) {
3717 found = bond_addr_in_mc_list(ha->addr, &bond->mc_list,
3718 bond_dev->addr_len);
3720 bond_mc_add(bond, ha->addr);
3723 /* looking for addresses to delete from slaves' list */
3724 netdev_hw_addr_list_for_each(ha, &bond->mc_list) {
3725 found = bond_addr_in_mc_list(ha->addr, &bond_dev->mc,
3726 bond_dev->addr_len);
3728 bond_mc_del(bond, ha->addr);
3731 /* save master's multicast list */
3732 __hw_addr_flush(&bond->mc_list);
3733 __hw_addr_add_multiple(&bond->mc_list, &bond_dev->mc,
3734 bond_dev->addr_len, NETDEV_HW_ADDR_T_MULTICAST);
3736 read_unlock(&bond->lock);
3739 static int bond_neigh_init(struct neighbour *n)
3741 struct bonding *bond = netdev_priv(n->dev);
3742 struct slave *slave = bond->first_slave;
3743 const struct net_device_ops *slave_ops;
3744 struct neigh_parms parms;
3750 slave_ops = slave->dev->netdev_ops;
3752 if (!slave_ops->ndo_neigh_setup)
3755 parms.neigh_setup = NULL;
3756 parms.neigh_cleanup = NULL;
3757 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3762 * Assign slave's neigh_cleanup to neighbour in case cleanup is called
3763 * after the last slave has been detached. Assumes that all slaves
3764 * utilize the same neigh_cleanup (true at this writing as only user
3767 n->parms->neigh_cleanup = parms.neigh_cleanup;
3769 if (!parms.neigh_setup)
3772 return parms.neigh_setup(n);
3776 * The bonding ndo_neigh_setup is called at init time beofre any
3777 * slave exists. So we must declare proxy setup function which will
3778 * be used at run time to resolve the actual slave neigh param setup.
3780 static int bond_neigh_setup(struct net_device *dev,
3781 struct neigh_parms *parms)
3783 parms->neigh_setup = bond_neigh_init;
3789 * Change the MTU of all of a master's slaves to match the master
3791 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3793 struct bonding *bond = netdev_priv(bond_dev);
3794 struct slave *slave, *stop_at;
3798 pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond,
3799 (bond_dev ? bond_dev->name : "None"), new_mtu);
3801 /* Can't hold bond->lock with bh disabled here since
3802 * some base drivers panic. On the other hand we can't
3803 * hold bond->lock without bh disabled because we'll
3804 * deadlock. The only solution is to rely on the fact
3805 * that we're under rtnl_lock here, and the slaves
3806 * list won't change. This doesn't solve the problem
3807 * of setting the slave's MTU while it is
3808 * transmitting, but the assumption is that the base
3809 * driver can handle that.
3811 * TODO: figure out a way to safely iterate the slaves
3812 * list, but without holding a lock around the actual
3813 * call to the base driver.
3816 bond_for_each_slave(bond, slave, i) {
3817 pr_debug("s %p s->p %p c_m %p\n",
3820 slave->dev->netdev_ops->ndo_change_mtu);
3822 res = dev_set_mtu(slave->dev, new_mtu);
3825 /* If we failed to set the slave's mtu to the new value
3826 * we must abort the operation even in ACTIVE_BACKUP
3827 * mode, because if we allow the backup slaves to have
3828 * different mtu values than the active slave we'll
3829 * need to change their mtu when doing a failover. That
3830 * means changing their mtu from timer context, which
3831 * is probably not a good idea.
3833 pr_debug("err %d %s\n", res, slave->dev->name);
3838 bond_dev->mtu = new_mtu;
3843 /* unwind from head to the slave that failed */
3845 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3848 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
3850 pr_debug("unwind err %d dev %s\n",
3851 tmp_res, slave->dev->name);
3861 * Note that many devices must be down to change the HW address, and
3862 * downing the master releases all slaves. We can make bonds full of
3863 * bonding devices to test this, however.
3865 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3867 struct bonding *bond = netdev_priv(bond_dev);
3868 struct sockaddr *sa = addr, tmp_sa;
3869 struct slave *slave, *stop_at;
3873 if (bond->params.mode == BOND_MODE_ALB)
3874 return bond_alb_set_mac_address(bond_dev, addr);
3877 pr_debug("bond=%p, name=%s\n",
3878 bond, bond_dev ? bond_dev->name : "None");
3881 * If fail_over_mac is set to active, do nothing and return
3882 * success. Returning an error causes ifenslave to fail.
3884 if (bond->params.fail_over_mac == BOND_FOM_ACTIVE)
3887 if (!is_valid_ether_addr(sa->sa_data))
3888 return -EADDRNOTAVAIL;
3890 /* Can't hold bond->lock with bh disabled here since
3891 * some base drivers panic. On the other hand we can't
3892 * hold bond->lock without bh disabled because we'll
3893 * deadlock. The only solution is to rely on the fact
3894 * that we're under rtnl_lock here, and the slaves
3895 * list won't change. This doesn't solve the problem
3896 * of setting the slave's hw address while it is
3897 * transmitting, but the assumption is that the base
3898 * driver can handle that.
3900 * TODO: figure out a way to safely iterate the slaves
3901 * list, but without holding a lock around the actual
3902 * call to the base driver.
3905 bond_for_each_slave(bond, slave, i) {
3906 const struct net_device_ops *slave_ops = slave->dev->netdev_ops;
3907 pr_debug("slave %p %s\n", slave, slave->dev->name);
3909 if (slave_ops->ndo_set_mac_address == NULL) {
3911 pr_debug("EOPNOTSUPP %s\n", slave->dev->name);
3915 res = dev_set_mac_address(slave->dev, addr);
3917 /* TODO: consider downing the slave
3919 * User should expect communications
3920 * breakage anyway until ARP finish
3923 pr_debug("err %d %s\n", res, slave->dev->name);
3929 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3933 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3934 tmp_sa.sa_family = bond_dev->type;
3936 /* unwind from head to the slave that failed */
3938 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3941 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
3943 pr_debug("unwind err %d dev %s\n",
3944 tmp_res, slave->dev->name);
3951 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3953 struct bonding *bond = netdev_priv(bond_dev);
3954 struct slave *slave, *start_at;
3955 int i, slave_no, res = 1;
3956 struct iphdr *iph = ip_hdr(skb);
3959 * Start with the curr_active_slave that joined the bond as the
3960 * default for sending IGMP traffic. For failover purposes one
3961 * needs to maintain some consistency for the interface that will
3962 * send the join/membership reports. The curr_active_slave found
3963 * will send all of this type of traffic.
3965 if ((iph->protocol == IPPROTO_IGMP) &&
3966 (skb->protocol == htons(ETH_P_IP))) {
3968 read_lock(&bond->curr_slave_lock);
3969 slave = bond->curr_active_slave;
3970 read_unlock(&bond->curr_slave_lock);
3976 * Concurrent TX may collide on rr_tx_counter; we accept
3977 * that as being rare enough not to justify using an
3980 slave_no = bond->rr_tx_counter++ % bond->slave_cnt;
3982 bond_for_each_slave(bond, slave, i) {
3990 bond_for_each_slave_from(bond, slave, i, start_at) {
3991 if (IS_UP(slave->dev) &&
3992 (slave->link == BOND_LINK_UP) &&
3993 bond_is_active_slave(slave)) {
3994 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4001 /* no suitable interface, frame not sent */
4005 return NETDEV_TX_OK;
4010 * in active-backup mode, we know that bond->curr_active_slave is always valid if
4011 * the bond has a usable interface.
4013 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
4015 struct bonding *bond = netdev_priv(bond_dev);
4018 read_lock(&bond->curr_slave_lock);
4020 if (bond->curr_active_slave)
4021 res = bond_dev_queue_xmit(bond, skb,
4022 bond->curr_active_slave->dev);
4024 read_unlock(&bond->curr_slave_lock);
4027 /* no suitable interface, frame not sent */
4030 return NETDEV_TX_OK;
4034 * In bond_xmit_xor() , we determine the output device by using a pre-
4035 * determined xmit_hash_policy(), If the selected device is not enabled,
4036 * find the next active slave.
4038 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
4040 struct bonding *bond = netdev_priv(bond_dev);
4041 struct slave *slave, *start_at;
4046 slave_no = bond->xmit_hash_policy(skb, bond->slave_cnt);
4048 bond_for_each_slave(bond, slave, i) {
4056 bond_for_each_slave_from(bond, slave, i, start_at) {
4057 if (IS_UP(slave->dev) &&
4058 (slave->link == BOND_LINK_UP) &&
4059 bond_is_active_slave(slave)) {
4060 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4066 /* no suitable interface, frame not sent */
4070 return NETDEV_TX_OK;
4074 * in broadcast mode, we send everything to all usable interfaces.
4076 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4078 struct bonding *bond = netdev_priv(bond_dev);
4079 struct slave *slave, *start_at;
4080 struct net_device *tx_dev = NULL;
4084 read_lock(&bond->curr_slave_lock);
4085 start_at = bond->curr_active_slave;
4086 read_unlock(&bond->curr_slave_lock);
4091 bond_for_each_slave_from(bond, slave, i, start_at) {
4092 if (IS_UP(slave->dev) &&
4093 (slave->link == BOND_LINK_UP) &&
4094 bond_is_active_slave(slave)) {
4096 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4098 pr_err("%s: Error: bond_xmit_broadcast(): skb_clone() failed\n",
4103 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4109 tx_dev = slave->dev;
4114 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4118 /* no suitable interface, frame not sent */
4121 /* frame sent to all suitable interfaces */
4122 return NETDEV_TX_OK;
4125 /*------------------------- Device initialization ---------------------------*/
4127 static void bond_set_xmit_hash_policy(struct bonding *bond)
4129 switch (bond->params.xmit_policy) {
4130 case BOND_XMIT_POLICY_LAYER23:
4131 bond->xmit_hash_policy = bond_xmit_hash_policy_l23;
4133 case BOND_XMIT_POLICY_LAYER34:
4134 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4136 case BOND_XMIT_POLICY_LAYER2:
4138 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4144 * Lookup the slave that corresponds to a qid
4146 static inline int bond_slave_override(struct bonding *bond,
4147 struct sk_buff *skb)
4150 struct slave *slave = NULL;
4151 struct slave *check_slave;
4153 if (!skb->queue_mapping)
4156 /* Find out if any slaves have the same mapping as this skb. */
4157 bond_for_each_slave(bond, check_slave, i) {
4158 if (check_slave->queue_id == skb->queue_mapping) {
4159 slave = check_slave;
4164 /* If the slave isn't UP, use default transmit policy. */
4165 if (slave && slave->queue_id && IS_UP(slave->dev) &&
4166 (slave->link == BOND_LINK_UP)) {
4167 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4174 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb)
4177 * This helper function exists to help dev_pick_tx get the correct
4178 * destination queue. Using a helper function skips a call to
4179 * skb_tx_hash and will put the skbs in the queue we expect on their
4180 * way down to the bonding driver.
4182 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
4185 * Save the original txq to restore before passing to the driver
4187 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
4189 if (unlikely(txq >= dev->real_num_tx_queues)) {
4191 txq -= dev->real_num_tx_queues;
4192 } while (txq >= dev->real_num_tx_queues);
4197 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4199 struct bonding *bond = netdev_priv(dev);
4201 if (TX_QUEUE_OVERRIDE(bond->params.mode)) {
4202 if (!bond_slave_override(bond, skb))
4203 return NETDEV_TX_OK;
4206 switch (bond->params.mode) {
4207 case BOND_MODE_ROUNDROBIN:
4208 return bond_xmit_roundrobin(skb, dev);
4209 case BOND_MODE_ACTIVEBACKUP:
4210 return bond_xmit_activebackup(skb, dev);
4212 return bond_xmit_xor(skb, dev);
4213 case BOND_MODE_BROADCAST:
4214 return bond_xmit_broadcast(skb, dev);
4215 case BOND_MODE_8023AD:
4216 return bond_3ad_xmit_xor(skb, dev);
4219 return bond_alb_xmit(skb, dev);
4221 /* Should never happen, mode already checked */
4222 pr_err("%s: Error: Unknown bonding mode %d\n",
4223 dev->name, bond->params.mode);
4226 return NETDEV_TX_OK;
4230 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4232 struct bonding *bond = netdev_priv(dev);
4233 netdev_tx_t ret = NETDEV_TX_OK;
4236 * If we risk deadlock from transmitting this in the
4237 * netpoll path, tell netpoll to queue the frame for later tx
4239 if (is_netpoll_tx_blocked(dev))
4240 return NETDEV_TX_BUSY;
4242 read_lock(&bond->lock);
4244 if (bond->slave_cnt)
4245 ret = __bond_start_xmit(skb, dev);
4249 read_unlock(&bond->lock);
4255 * set bond mode specific net device operations
4257 void bond_set_mode_ops(struct bonding *bond, int mode)
4259 struct net_device *bond_dev = bond->dev;
4262 case BOND_MODE_ROUNDROBIN:
4264 case BOND_MODE_ACTIVEBACKUP:
4267 bond_set_xmit_hash_policy(bond);
4269 case BOND_MODE_BROADCAST:
4271 case BOND_MODE_8023AD:
4272 bond_set_xmit_hash_policy(bond);
4279 /* Should never happen, mode already checked */
4280 pr_err("%s: Error: Unknown bonding mode %d\n",
4281 bond_dev->name, mode);
4286 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4287 struct ethtool_drvinfo *drvinfo)
4289 strncpy(drvinfo->driver, DRV_NAME, 32);
4290 strncpy(drvinfo->version, DRV_VERSION, 32);
4291 snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
4294 static const struct ethtool_ops bond_ethtool_ops = {
4295 .get_drvinfo = bond_ethtool_get_drvinfo,
4296 .get_link = ethtool_op_get_link,
4299 static const struct net_device_ops bond_netdev_ops = {
4300 .ndo_init = bond_init,
4301 .ndo_uninit = bond_uninit,
4302 .ndo_open = bond_open,
4303 .ndo_stop = bond_close,
4304 .ndo_start_xmit = bond_start_xmit,
4305 .ndo_select_queue = bond_select_queue,
4306 .ndo_get_stats64 = bond_get_stats,
4307 .ndo_do_ioctl = bond_do_ioctl,
4308 .ndo_change_rx_flags = bond_change_rx_flags,
4309 .ndo_set_rx_mode = bond_set_multicast_list,
4310 .ndo_change_mtu = bond_change_mtu,
4311 .ndo_set_mac_address = bond_set_mac_address,
4312 .ndo_neigh_setup = bond_neigh_setup,
4313 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid,
4314 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid,
4315 #ifdef CONFIG_NET_POLL_CONTROLLER
4316 .ndo_netpoll_setup = bond_netpoll_setup,
4317 .ndo_netpoll_cleanup = bond_netpoll_cleanup,
4318 .ndo_poll_controller = bond_poll_controller,
4320 .ndo_add_slave = bond_enslave,
4321 .ndo_del_slave = bond_release,
4322 .ndo_fix_features = bond_fix_features,
4325 static void bond_destructor(struct net_device *bond_dev)
4327 struct bonding *bond = netdev_priv(bond_dev);
4329 destroy_workqueue(bond->wq);
4330 free_netdev(bond_dev);
4333 static void bond_setup(struct net_device *bond_dev)
4335 struct bonding *bond = netdev_priv(bond_dev);
4337 /* initialize rwlocks */
4338 rwlock_init(&bond->lock);
4339 rwlock_init(&bond->curr_slave_lock);
4341 bond->params = bonding_defaults;
4343 /* Initialize pointers */
4344 bond->dev = bond_dev;
4345 INIT_LIST_HEAD(&bond->vlan_list);
4347 /* Initialize the device entry points */
4348 ether_setup(bond_dev);
4349 bond_dev->netdev_ops = &bond_netdev_ops;
4350 bond_dev->ethtool_ops = &bond_ethtool_ops;
4351 bond_set_mode_ops(bond, bond->params.mode);
4353 bond_dev->destructor = bond_destructor;
4355 /* Initialize the device options */
4356 bond_dev->tx_queue_len = 0;
4357 bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4358 bond_dev->priv_flags |= IFF_BONDING;
4359 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4361 /* At first, we block adding VLANs. That's the only way to
4362 * prevent problems that occur when adding VLANs over an
4363 * empty bond. The block will be removed once non-challenged
4364 * slaves are enslaved.
4366 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4368 /* don't acquire bond device's netif_tx_lock when
4370 bond_dev->features |= NETIF_F_LLTX;
4372 /* By default, we declare the bond to be fully
4373 * VLAN hardware accelerated capable. Special
4374 * care is taken in the various xmit functions
4375 * when there are slaves that are not hw accel
4379 bond_dev->hw_features = BOND_VLAN_FEATURES |
4380 NETIF_F_HW_VLAN_TX |
4381 NETIF_F_HW_VLAN_RX |
4382 NETIF_F_HW_VLAN_FILTER;
4384 bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM);
4385 bond_dev->features |= bond_dev->hw_features;
4388 static void bond_work_cancel_all(struct bonding *bond)
4390 if (bond->params.miimon && delayed_work_pending(&bond->mii_work))
4391 cancel_delayed_work_sync(&bond->mii_work);
4393 if (bond->params.arp_interval && delayed_work_pending(&bond->arp_work))
4394 cancel_delayed_work_sync(&bond->arp_work);
4396 if (bond->params.mode == BOND_MODE_ALB &&
4397 delayed_work_pending(&bond->alb_work))
4398 cancel_delayed_work_sync(&bond->alb_work);
4400 if (bond->params.mode == BOND_MODE_8023AD &&
4401 delayed_work_pending(&bond->ad_work))
4402 cancel_delayed_work_sync(&bond->ad_work);
4404 if (delayed_work_pending(&bond->mcast_work))
4405 cancel_delayed_work_sync(&bond->mcast_work);
4409 * Destroy a bonding device.
4410 * Must be under rtnl_lock when this function is called.
4412 static void bond_uninit(struct net_device *bond_dev)
4414 struct bonding *bond = netdev_priv(bond_dev);
4415 struct vlan_entry *vlan, *tmp;
4417 bond_netpoll_cleanup(bond_dev);
4419 /* Release the bonded slaves */
4420 bond_release_all(bond_dev);
4422 list_del(&bond->bond_list);
4424 bond_work_cancel_all(bond);
4426 bond_debug_unregister(bond);
4428 __hw_addr_flush(&bond->mc_list);
4430 list_for_each_entry_safe(vlan, tmp, &bond->vlan_list, vlan_list) {
4431 list_del(&vlan->vlan_list);
4436 /*------------------------- Module initialization ---------------------------*/
4439 * Convert string input module parms. Accept either the
4440 * number of the mode or its string name. A bit complicated because
4441 * some mode names are substrings of other names, and calls from sysfs
4442 * may have whitespace in the name (trailing newlines, for example).
4444 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl)
4446 int modeint = -1, i, rv;
4447 char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, };
4449 for (p = (char *)buf; *p; p++)
4450 if (!(isdigit(*p) || isspace(*p)))
4454 rv = sscanf(buf, "%20s", modestr);
4456 rv = sscanf(buf, "%d", &modeint);
4461 for (i = 0; tbl[i].modename; i++) {
4462 if (modeint == tbl[i].mode)
4464 if (strcmp(modestr, tbl[i].modename) == 0)
4471 static int bond_check_params(struct bond_params *params)
4473 int arp_validate_value, fail_over_mac_value, primary_reselect_value;
4476 * Convert string parameters.
4479 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4480 if (bond_mode == -1) {
4481 pr_err("Error: Invalid bonding mode \"%s\"\n",
4482 mode == NULL ? "NULL" : mode);
4487 if (xmit_hash_policy) {
4488 if ((bond_mode != BOND_MODE_XOR) &&
4489 (bond_mode != BOND_MODE_8023AD)) {
4490 pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4491 bond_mode_name(bond_mode));
4493 xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4495 if (xmit_hashtype == -1) {
4496 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4497 xmit_hash_policy == NULL ? "NULL" :
4505 if (bond_mode != BOND_MODE_8023AD) {
4506 pr_info("lacp_rate param is irrelevant in mode %s\n",
4507 bond_mode_name(bond_mode));
4509 lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4510 if (lacp_fast == -1) {
4511 pr_err("Error: Invalid lacp rate \"%s\"\n",
4512 lacp_rate == NULL ? "NULL" : lacp_rate);
4519 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl);
4520 if (params->ad_select == -1) {
4521 pr_err("Error: Invalid ad_select \"%s\"\n",
4522 ad_select == NULL ? "NULL" : ad_select);
4526 if (bond_mode != BOND_MODE_8023AD) {
4527 pr_warning("ad_select param only affects 802.3ad mode\n");
4530 params->ad_select = BOND_AD_STABLE;
4533 if (max_bonds < 0) {
4534 pr_warning("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4535 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4536 max_bonds = BOND_DEFAULT_MAX_BONDS;
4540 pr_warning("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to %d\n",
4541 miimon, INT_MAX, BOND_LINK_MON_INTERV);
4542 miimon = BOND_LINK_MON_INTERV;
4546 pr_warning("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4551 if (downdelay < 0) {
4552 pr_warning("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4553 downdelay, INT_MAX);
4557 if ((use_carrier != 0) && (use_carrier != 1)) {
4558 pr_warning("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4563 if (num_peer_notif < 0 || num_peer_notif > 255) {
4564 pr_warning("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4569 /* reset values for 802.3ad */
4570 if (bond_mode == BOND_MODE_8023AD) {
4572 pr_warning("Warning: miimon must be specified, otherwise bonding will not detect link failure, speed and duplex which are essential for 802.3ad operation\n");
4573 pr_warning("Forcing miimon to 100msec\n");
4578 if (tx_queues < 1 || tx_queues > 255) {
4579 pr_warning("Warning: tx_queues (%d) should be between "
4580 "1 and 255, resetting to %d\n",
4581 tx_queues, BOND_DEFAULT_TX_QUEUES);
4582 tx_queues = BOND_DEFAULT_TX_QUEUES;
4585 if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4586 pr_warning("Warning: all_slaves_active module parameter (%d), "
4587 "not of valid value (0/1), so it was set to "
4588 "0\n", all_slaves_active);
4589 all_slaves_active = 0;
4592 if (resend_igmp < 0 || resend_igmp > 255) {
4593 pr_warning("Warning: resend_igmp (%d) should be between "
4594 "0 and 255, resetting to %d\n",
4595 resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4596 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4599 /* reset values for TLB/ALB */
4600 if ((bond_mode == BOND_MODE_TLB) ||
4601 (bond_mode == BOND_MODE_ALB)) {
4603 pr_warning("Warning: miimon must be specified, otherwise bonding will not detect link failure and link speed which are essential for TLB/ALB load balancing\n");
4604 pr_warning("Forcing miimon to 100msec\n");
4609 if (bond_mode == BOND_MODE_ALB) {
4610 pr_notice("In ALB mode you might experience client disconnections upon reconnection of a link if the bonding module updelay parameter (%d msec) is incompatible with the forwarding delay time of the switch\n",
4615 if (updelay || downdelay) {
4616 /* just warn the user the up/down delay will have
4617 * no effect since miimon is zero...
4619 pr_warning("Warning: miimon module parameter not set and updelay (%d) or downdelay (%d) module parameter is set; updelay and downdelay have no effect unless miimon is set\n",
4620 updelay, downdelay);
4623 /* don't allow arp monitoring */
4625 pr_warning("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4626 miimon, arp_interval);
4630 if ((updelay % miimon) != 0) {
4631 pr_warning("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4633 (updelay / miimon) * miimon);
4638 if ((downdelay % miimon) != 0) {
4639 pr_warning("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4641 (downdelay / miimon) * miimon);
4644 downdelay /= miimon;
4647 if (arp_interval < 0) {
4648 pr_warning("Warning: arp_interval module parameter (%d) , not in range 0-%d, so it was reset to %d\n",
4649 arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4650 arp_interval = BOND_LINK_ARP_INTERV;
4653 for (arp_ip_count = 0;
4654 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
4656 /* not complete check, but should be good enough to
4658 if (!isdigit(arp_ip_target[arp_ip_count][0])) {
4659 pr_warning("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4660 arp_ip_target[arp_ip_count]);
4663 __be32 ip = in_aton(arp_ip_target[arp_ip_count]);
4664 arp_target[arp_ip_count] = ip;
4668 if (arp_interval && !arp_ip_count) {
4669 /* don't allow arping if no arp_ip_target given... */
4670 pr_warning("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4676 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4677 pr_err("arp_validate only supported in active-backup mode\n");
4680 if (!arp_interval) {
4681 pr_err("arp_validate requires arp_interval\n");
4685 arp_validate_value = bond_parse_parm(arp_validate,
4687 if (arp_validate_value == -1) {
4688 pr_err("Error: invalid arp_validate \"%s\"\n",
4689 arp_validate == NULL ? "NULL" : arp_validate);
4693 arp_validate_value = 0;
4696 pr_info("MII link monitoring set to %d ms\n", miimon);
4697 } else if (arp_interval) {
4700 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4702 arp_validate_tbl[arp_validate_value].modename,
4705 for (i = 0; i < arp_ip_count; i++)
4706 pr_info(" %s", arp_ip_target[i]);
4710 } else if (max_bonds) {
4711 /* miimon and arp_interval not set, we need one so things
4712 * work as expected, see bonding.txt for details
4714 pr_debug("Warning: either miimon or arp_interval and arp_ip_target module parameters must be specified, otherwise bonding will not detect link failures! see bonding.txt for details.\n");
4717 if (primary && !USES_PRIMARY(bond_mode)) {
4718 /* currently, using a primary only makes sense
4719 * in active backup, TLB or ALB modes
4721 pr_warning("Warning: %s primary device specified but has no effect in %s mode\n",
4722 primary, bond_mode_name(bond_mode));
4726 if (primary && primary_reselect) {
4727 primary_reselect_value = bond_parse_parm(primary_reselect,
4729 if (primary_reselect_value == -1) {
4730 pr_err("Error: Invalid primary_reselect \"%s\"\n",
4732 NULL ? "NULL" : primary_reselect);
4736 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4739 if (fail_over_mac) {
4740 fail_over_mac_value = bond_parse_parm(fail_over_mac,
4742 if (fail_over_mac_value == -1) {
4743 pr_err("Error: invalid fail_over_mac \"%s\"\n",
4744 arp_validate == NULL ? "NULL" : arp_validate);
4748 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4749 pr_warning("Warning: fail_over_mac only affects active-backup mode.\n");
4751 fail_over_mac_value = BOND_FOM_NONE;
4754 /* fill params struct with the proper values */
4755 params->mode = bond_mode;
4756 params->xmit_policy = xmit_hashtype;
4757 params->miimon = miimon;
4758 params->num_peer_notif = num_peer_notif;
4759 params->arp_interval = arp_interval;
4760 params->arp_validate = arp_validate_value;
4761 params->updelay = updelay;
4762 params->downdelay = downdelay;
4763 params->use_carrier = use_carrier;
4764 params->lacp_fast = lacp_fast;
4765 params->primary[0] = 0;
4766 params->primary_reselect = primary_reselect_value;
4767 params->fail_over_mac = fail_over_mac_value;
4768 params->tx_queues = tx_queues;
4769 params->all_slaves_active = all_slaves_active;
4770 params->resend_igmp = resend_igmp;
4771 params->min_links = min_links;
4774 strncpy(params->primary, primary, IFNAMSIZ);
4775 params->primary[IFNAMSIZ - 1] = 0;
4778 memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4783 static struct lock_class_key bonding_netdev_xmit_lock_key;
4784 static struct lock_class_key bonding_netdev_addr_lock_key;
4786 static void bond_set_lockdep_class_one(struct net_device *dev,
4787 struct netdev_queue *txq,
4790 lockdep_set_class(&txq->_xmit_lock,
4791 &bonding_netdev_xmit_lock_key);
4794 static void bond_set_lockdep_class(struct net_device *dev)
4796 lockdep_set_class(&dev->addr_list_lock,
4797 &bonding_netdev_addr_lock_key);
4798 netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4802 * Called from registration process
4804 static int bond_init(struct net_device *bond_dev)
4806 struct bonding *bond = netdev_priv(bond_dev);
4807 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4808 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
4810 pr_debug("Begin bond_init for %s\n", bond_dev->name);
4813 * Initialize locks that may be required during
4814 * en/deslave operations. All of the bond_open work
4815 * (of which this is part) should really be moved to
4816 * a phase prior to dev_open
4818 spin_lock_init(&(bond_info->tx_hashtbl_lock));
4819 spin_lock_init(&(bond_info->rx_hashtbl_lock));
4821 bond->wq = create_singlethread_workqueue(bond_dev->name);
4825 bond_set_lockdep_class(bond_dev);
4827 list_add_tail(&bond->bond_list, &bn->dev_list);
4829 bond_prepare_sysfs_group(bond);
4831 bond_debug_register(bond);
4833 __hw_addr_init(&bond->mc_list);
4837 static int bond_validate(struct nlattr *tb[], struct nlattr *data[])
4839 if (tb[IFLA_ADDRESS]) {
4840 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
4842 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
4843 return -EADDRNOTAVAIL;
4848 static unsigned int bond_get_num_tx_queues(void)
4853 static struct rtnl_link_ops bond_link_ops __read_mostly = {
4855 .priv_size = sizeof(struct bonding),
4856 .setup = bond_setup,
4857 .validate = bond_validate,
4858 .get_num_tx_queues = bond_get_num_tx_queues,
4859 .get_num_rx_queues = bond_get_num_tx_queues, /* Use the same number
4863 /* Create a new bond based on the specified name and bonding parameters.
4864 * If name is NULL, obtain a suitable "bond%d" name for us.
4865 * Caller must NOT hold rtnl_lock; we need to release it here before we
4866 * set up our sysfs entries.
4868 int bond_create(struct net *net, const char *name)
4870 struct net_device *bond_dev;
4875 bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4876 name ? name : "bond%d",
4877 bond_setup, tx_queues);
4879 pr_err("%s: eek! can't alloc netdev!\n", name);
4884 dev_net_set(bond_dev, net);
4885 bond_dev->rtnl_link_ops = &bond_link_ops;
4887 res = register_netdevice(bond_dev);
4889 netif_carrier_off(bond_dev);
4893 bond_destructor(bond_dev);
4897 static int __net_init bond_net_init(struct net *net)
4899 struct bond_net *bn = net_generic(net, bond_net_id);
4902 INIT_LIST_HEAD(&bn->dev_list);
4904 bond_create_proc_dir(bn);
4905 bond_create_sysfs(bn);
4910 static void __net_exit bond_net_exit(struct net *net)
4912 struct bond_net *bn = net_generic(net, bond_net_id);
4914 bond_destroy_sysfs(bn);
4915 bond_destroy_proc_dir(bn);
4918 static struct pernet_operations bond_net_ops = {
4919 .init = bond_net_init,
4920 .exit = bond_net_exit,
4922 .size = sizeof(struct bond_net),
4925 static int __init bonding_init(void)
4930 pr_info("%s", bond_version);
4932 res = bond_check_params(&bonding_defaults);
4936 res = register_pernet_subsys(&bond_net_ops);
4940 res = rtnl_link_register(&bond_link_ops);
4944 bond_create_debugfs();
4946 for (i = 0; i < max_bonds; i++) {
4947 res = bond_create(&init_net, NULL);
4952 register_netdevice_notifier(&bond_netdev_notifier);
4956 rtnl_link_unregister(&bond_link_ops);
4958 unregister_pernet_subsys(&bond_net_ops);
4963 static void __exit bonding_exit(void)
4965 unregister_netdevice_notifier(&bond_netdev_notifier);
4967 bond_destroy_debugfs();
4969 rtnl_link_unregister(&bond_link_ops);
4970 unregister_pernet_subsys(&bond_net_ops);
4972 #ifdef CONFIG_NET_POLL_CONTROLLER
4974 * Make sure we don't have an imbalance on our netpoll blocking
4976 WARN_ON(atomic_read(&netpoll_block_tx));
4980 module_init(bonding_init);
4981 module_exit(bonding_exit);
4982 MODULE_LICENSE("GPL");
4983 MODULE_VERSION(DRV_VERSION);
4984 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4985 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
4986 MODULE_ALIAS_RTNL_LINK("bond");