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>
57 #include <asm/system.h>
59 #include <linux/uaccess.h>
60 #include <linux/errno.h>
61 #include <linux/netdevice.h>
62 #include <linux/inetdevice.h>
63 #include <linux/igmp.h>
64 #include <linux/etherdevice.h>
65 #include <linux/skbuff.h>
67 #include <linux/rtnetlink.h>
68 #include <linux/smp.h>
69 #include <linux/if_ether.h>
71 #include <linux/mii.h>
72 #include <linux/ethtool.h>
73 #include <linux/if_vlan.h>
74 #include <linux/if_bonding.h>
75 #include <linux/jiffies.h>
76 #include <linux/preempt.h>
77 #include <net/route.h>
78 #include <net/net_namespace.h>
79 #include <net/netns/generic.h>
80 #include <net/pkt_sched.h>
85 /*---------------------------- Module parameters ----------------------------*/
87 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
88 #define BOND_LINK_MON_INTERV 0
89 #define BOND_LINK_ARP_INTERV 0
91 static int max_bonds = BOND_DEFAULT_MAX_BONDS;
92 static int tx_queues = BOND_DEFAULT_TX_QUEUES;
93 static int num_peer_notif = 1;
94 static int miimon = BOND_LINK_MON_INTERV;
97 static int use_carrier = 1;
100 static char *primary_reselect;
101 static char *lacp_rate;
102 static int min_links;
103 static char *ad_select;
104 static char *xmit_hash_policy;
105 static int arp_interval = BOND_LINK_ARP_INTERV;
106 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
107 static char *arp_validate;
108 static char *fail_over_mac;
109 static int all_slaves_active = 0;
110 static struct bond_params bonding_defaults;
111 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
113 module_param(max_bonds, int, 0);
114 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
115 module_param(tx_queues, int, 0);
116 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
117 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
118 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
119 "failover event (alias of num_unsol_na)");
120 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
121 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
122 "failover event (alias of num_grat_arp)");
123 module_param(miimon, int, 0);
124 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
125 module_param(updelay, int, 0);
126 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
127 module_param(downdelay, int, 0);
128 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
130 module_param(use_carrier, int, 0);
131 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
132 "0 for off, 1 for on (default)");
133 module_param(mode, charp, 0);
134 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
135 "1 for active-backup, 2 for balance-xor, "
136 "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
137 "6 for balance-alb");
138 module_param(primary, charp, 0);
139 MODULE_PARM_DESC(primary, "Primary network device to use");
140 module_param(primary_reselect, charp, 0);
141 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
143 "0 for always (default), "
144 "1 for only if speed of primary is "
146 "2 for only on active slave "
148 module_param(lacp_rate, charp, 0);
149 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
150 "0 for slow, 1 for fast");
151 module_param(ad_select, charp, 0);
152 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic; "
153 "0 for stable (default), 1 for bandwidth, "
155 module_param(min_links, int, 0);
156 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
158 module_param(xmit_hash_policy, charp, 0);
159 MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; "
160 "0 for layer 2 (default), 1 for layer 3+4, "
162 module_param(arp_interval, int, 0);
163 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
164 module_param_array(arp_ip_target, charp, NULL, 0);
165 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
166 module_param(arp_validate, charp, 0);
167 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
168 "0 for none (default), 1 for active, "
169 "2 for backup, 3 for all");
170 module_param(fail_over_mac, charp, 0);
171 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
172 "the same MAC; 0 for none (default), "
173 "1 for active, 2 for follow");
174 module_param(all_slaves_active, int, 0);
175 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface"
176 "by setting active flag for all slaves; "
177 "0 for never (default), 1 for always.");
178 module_param(resend_igmp, int, 0);
179 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
182 /*----------------------------- Global variables ----------------------------*/
184 #ifdef CONFIG_NET_POLL_CONTROLLER
185 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
188 int bond_net_id __read_mostly;
190 static __be32 arp_target[BOND_MAX_ARP_TARGETS];
191 static int arp_ip_count;
192 static int bond_mode = BOND_MODE_ROUNDROBIN;
193 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
194 static int lacp_fast;
196 const struct bond_parm_tbl bond_lacp_tbl[] = {
197 { "slow", AD_LACP_SLOW},
198 { "fast", AD_LACP_FAST},
202 const struct bond_parm_tbl bond_mode_tbl[] = {
203 { "balance-rr", BOND_MODE_ROUNDROBIN},
204 { "active-backup", BOND_MODE_ACTIVEBACKUP},
205 { "balance-xor", BOND_MODE_XOR},
206 { "broadcast", BOND_MODE_BROADCAST},
207 { "802.3ad", BOND_MODE_8023AD},
208 { "balance-tlb", BOND_MODE_TLB},
209 { "balance-alb", BOND_MODE_ALB},
213 const struct bond_parm_tbl xmit_hashtype_tbl[] = {
214 { "layer2", BOND_XMIT_POLICY_LAYER2},
215 { "layer3+4", BOND_XMIT_POLICY_LAYER34},
216 { "layer2+3", BOND_XMIT_POLICY_LAYER23},
220 const struct bond_parm_tbl arp_validate_tbl[] = {
221 { "none", BOND_ARP_VALIDATE_NONE},
222 { "active", BOND_ARP_VALIDATE_ACTIVE},
223 { "backup", BOND_ARP_VALIDATE_BACKUP},
224 { "all", BOND_ARP_VALIDATE_ALL},
228 const struct bond_parm_tbl fail_over_mac_tbl[] = {
229 { "none", BOND_FOM_NONE},
230 { "active", BOND_FOM_ACTIVE},
231 { "follow", BOND_FOM_FOLLOW},
235 const struct bond_parm_tbl pri_reselect_tbl[] = {
236 { "always", BOND_PRI_RESELECT_ALWAYS},
237 { "better", BOND_PRI_RESELECT_BETTER},
238 { "failure", BOND_PRI_RESELECT_FAILURE},
242 struct bond_parm_tbl ad_select_tbl[] = {
243 { "stable", BOND_AD_STABLE},
244 { "bandwidth", BOND_AD_BANDWIDTH},
245 { "count", BOND_AD_COUNT},
249 /*-------------------------- Forward declarations ---------------------------*/
251 static int bond_init(struct net_device *bond_dev);
252 static void bond_uninit(struct net_device *bond_dev);
254 /*---------------------------- General routines -----------------------------*/
256 const char *bond_mode_name(int mode)
258 static const char *names[] = {
259 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
260 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
261 [BOND_MODE_XOR] = "load balancing (xor)",
262 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
263 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
264 [BOND_MODE_TLB] = "transmit load balancing",
265 [BOND_MODE_ALB] = "adaptive load balancing",
268 if (mode < 0 || mode > BOND_MODE_ALB)
274 /*---------------------------------- VLAN -----------------------------------*/
277 * bond_add_vlan - add a new vlan id on bond
278 * @bond: bond that got the notification
279 * @vlan_id: the vlan id to add
281 * Returns -ENOMEM if allocation failed.
283 static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
285 struct vlan_entry *vlan;
287 pr_debug("bond: %s, vlan id %d\n",
288 (bond ? bond->dev->name : "None"), vlan_id);
290 vlan = kzalloc(sizeof(struct vlan_entry), GFP_KERNEL);
294 INIT_LIST_HEAD(&vlan->vlan_list);
295 vlan->vlan_id = vlan_id;
297 write_lock_bh(&bond->lock);
299 list_add_tail(&vlan->vlan_list, &bond->vlan_list);
301 write_unlock_bh(&bond->lock);
303 pr_debug("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
309 * bond_del_vlan - delete a vlan id from bond
310 * @bond: bond that got the notification
311 * @vlan_id: the vlan id to delete
313 * returns -ENODEV if @vlan_id was not found in @bond.
315 static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
317 struct vlan_entry *vlan;
320 pr_debug("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
323 write_lock_bh(&bond->lock);
325 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
326 if (vlan->vlan_id == vlan_id) {
327 list_del(&vlan->vlan_list);
329 if (bond_is_lb(bond))
330 bond_alb_clear_vlan(bond, vlan_id);
332 pr_debug("removed VLAN ID %d from bond %s\n",
333 vlan_id, bond->dev->name);
342 pr_debug("couldn't find VLAN ID %d in bond %s\n",
343 vlan_id, bond->dev->name);
346 write_unlock_bh(&bond->lock);
347 unblock_netpoll_tx();
352 * bond_next_vlan - safely skip to the next item in the vlans list.
353 * @bond: the bond we're working on
354 * @curr: item we're advancing from
356 * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
357 * or @curr->next otherwise (even if it is @curr itself again).
359 * Caller must hold bond->lock
361 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
363 struct vlan_entry *next, *last;
365 if (list_empty(&bond->vlan_list))
369 next = list_entry(bond->vlan_list.next,
370 struct vlan_entry, vlan_list);
372 last = list_entry(bond->vlan_list.prev,
373 struct vlan_entry, vlan_list);
375 next = list_entry(bond->vlan_list.next,
376 struct vlan_entry, vlan_list);
378 next = list_entry(curr->vlan_list.next,
379 struct vlan_entry, vlan_list);
387 * bond_dev_queue_xmit - Prepare skb for xmit.
389 * @bond: bond device that got this skb for tx.
390 * @skb: hw accel VLAN tagged skb to transmit
391 * @slave_dev: slave that is supposed to xmit this skbuff
393 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
394 struct net_device *slave_dev)
396 skb->dev = slave_dev;
398 BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
399 sizeof(qdisc_skb_cb(skb)->bond_queue_mapping));
400 skb->queue_mapping = qdisc_skb_cb(skb)->bond_queue_mapping;
402 if (unlikely(netpoll_tx_running(slave_dev)))
403 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
411 * In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
412 * We don't protect the slave list iteration with a lock because:
413 * a. This operation is performed in IOCTL context,
414 * b. The operation is protected by the RTNL semaphore in the 8021q code,
415 * c. Holding a lock with BH disabled while directly calling a base driver
416 * entry point is generally a BAD idea.
418 * The design of synchronization/protection for this operation in the 8021q
419 * module is good for one or more VLAN devices over a single physical device
420 * and cannot be extended for a teaming solution like bonding, so there is a
421 * potential race condition here where a net device from the vlan group might
422 * be referenced (either by a base driver or the 8021q code) while it is being
423 * removed from the system. However, it turns out we're not making matters
424 * worse, and if it works for regular VLAN usage it will work here too.
428 * bond_vlan_rx_add_vid - Propagates adding an id to slaves
429 * @bond_dev: bonding net device that got called
430 * @vid: vlan id being added
432 static void bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid)
434 struct bonding *bond = netdev_priv(bond_dev);
438 bond_for_each_slave(bond, slave, i) {
439 struct net_device *slave_dev = slave->dev;
440 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
442 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
443 slave_ops->ndo_vlan_rx_add_vid) {
444 slave_ops->ndo_vlan_rx_add_vid(slave_dev, vid);
448 res = bond_add_vlan(bond, vid);
450 pr_err("%s: Error: Failed to add vlan id %d\n",
451 bond_dev->name, vid);
456 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
457 * @bond_dev: bonding net device that got called
458 * @vid: vlan id being removed
460 static void bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid)
462 struct bonding *bond = netdev_priv(bond_dev);
466 bond_for_each_slave(bond, slave, i) {
467 struct net_device *slave_dev = slave->dev;
468 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
470 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
471 slave_ops->ndo_vlan_rx_kill_vid) {
472 slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vid);
476 res = bond_del_vlan(bond, vid);
478 pr_err("%s: Error: Failed to remove vlan id %d\n",
479 bond_dev->name, vid);
483 static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
485 struct vlan_entry *vlan;
486 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
488 if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
489 !(slave_ops->ndo_vlan_rx_add_vid))
492 list_for_each_entry(vlan, &bond->vlan_list, vlan_list)
493 slave_ops->ndo_vlan_rx_add_vid(slave_dev, vlan->vlan_id);
496 static void bond_del_vlans_from_slave(struct bonding *bond,
497 struct net_device *slave_dev)
499 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
500 struct vlan_entry *vlan;
502 if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
503 !(slave_ops->ndo_vlan_rx_kill_vid))
506 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
509 slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vlan->vlan_id);
513 /*------------------------------- Link status -------------------------------*/
516 * Set the carrier state for the master according to the state of its
517 * slaves. If any slaves are up, the master is up. In 802.3ad mode,
518 * do special 802.3ad magic.
520 * Returns zero if carrier state does not change, nonzero if it does.
522 static int bond_set_carrier(struct bonding *bond)
527 if (bond->slave_cnt == 0)
530 if (bond->params.mode == BOND_MODE_8023AD)
531 return bond_3ad_set_carrier(bond);
533 bond_for_each_slave(bond, slave, i) {
534 if (slave->link == BOND_LINK_UP) {
535 if (!netif_carrier_ok(bond->dev)) {
536 netif_carrier_on(bond->dev);
544 if (netif_carrier_ok(bond->dev)) {
545 netif_carrier_off(bond->dev);
552 * Get link speed and duplex from the slave's base driver
553 * using ethtool. If for some reason the call fails or the
554 * values are invalid, set speed and duplex to -1,
557 static int bond_update_speed_duplex(struct slave *slave)
559 struct net_device *slave_dev = slave->dev;
560 struct ethtool_cmd ecmd;
564 slave->speed = SPEED_UNKNOWN;
565 slave->duplex = DUPLEX_UNKNOWN;
567 res = __ethtool_get_settings(slave_dev, &ecmd);
571 slave_speed = ethtool_cmd_speed(&ecmd);
572 if (slave_speed == 0 || slave_speed == ((__u32) -1))
575 switch (ecmd.duplex) {
583 slave->speed = slave_speed;
584 slave->duplex = ecmd.duplex;
590 * if <dev> supports MII link status reporting, check its link status.
592 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
593 * depending upon the setting of the use_carrier parameter.
595 * Return either BMSR_LSTATUS, meaning that the link is up (or we
596 * can't tell and just pretend it is), or 0, meaning that the link is
599 * If reporting is non-zero, instead of faking link up, return -1 if
600 * both ETHTOOL and MII ioctls fail (meaning the device does not
601 * support them). If use_carrier is set, return whatever it says.
602 * It'd be nice if there was a good way to tell if a driver supports
603 * netif_carrier, but there really isn't.
605 static int bond_check_dev_link(struct bonding *bond,
606 struct net_device *slave_dev, int reporting)
608 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
609 int (*ioctl)(struct net_device *, struct ifreq *, int);
611 struct mii_ioctl_data *mii;
613 if (!reporting && !netif_running(slave_dev))
616 if (bond->params.use_carrier)
617 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
619 /* Try to get link status using Ethtool first. */
620 if (slave_dev->ethtool_ops) {
621 if (slave_dev->ethtool_ops->get_link) {
624 link = slave_dev->ethtool_ops->get_link(slave_dev);
626 return link ? BMSR_LSTATUS : 0;
630 /* Ethtool can't be used, fallback to MII ioctls. */
631 ioctl = slave_ops->ndo_do_ioctl;
633 /* TODO: set pointer to correct ioctl on a per team member */
634 /* bases to make this more efficient. that is, once */
635 /* we determine the correct ioctl, we will always */
636 /* call it and not the others for that team */
640 * We cannot assume that SIOCGMIIPHY will also read a
641 * register; not all network drivers (e.g., e100)
645 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
646 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
648 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
649 mii->reg_num = MII_BMSR;
650 if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
651 return mii->val_out & BMSR_LSTATUS;
656 * If reporting, report that either there's no dev->do_ioctl,
657 * or both SIOCGMIIREG and get_link failed (meaning that we
658 * cannot report link status). If not reporting, pretend
661 return reporting ? -1 : BMSR_LSTATUS;
664 /*----------------------------- Multicast list ------------------------------*/
667 * Push the promiscuity flag down to appropriate slaves
669 static int bond_set_promiscuity(struct bonding *bond, int inc)
672 if (USES_PRIMARY(bond->params.mode)) {
673 /* write lock already acquired */
674 if (bond->curr_active_slave) {
675 err = dev_set_promiscuity(bond->curr_active_slave->dev,
681 bond_for_each_slave(bond, slave, i) {
682 err = dev_set_promiscuity(slave->dev, inc);
691 * Push the allmulti flag down to all slaves
693 static int bond_set_allmulti(struct bonding *bond, int inc)
696 if (USES_PRIMARY(bond->params.mode)) {
697 /* write lock already acquired */
698 if (bond->curr_active_slave) {
699 err = dev_set_allmulti(bond->curr_active_slave->dev,
705 bond_for_each_slave(bond, slave, i) {
706 err = dev_set_allmulti(slave->dev, inc);
715 * Add a Multicast address to slaves
718 static void bond_mc_add(struct bonding *bond, void *addr)
720 if (USES_PRIMARY(bond->params.mode)) {
721 /* write lock already acquired */
722 if (bond->curr_active_slave)
723 dev_mc_add(bond->curr_active_slave->dev, addr);
728 bond_for_each_slave(bond, slave, i)
729 dev_mc_add(slave->dev, addr);
734 * Remove a multicast address from slave
737 static void bond_mc_del(struct bonding *bond, void *addr)
739 if (USES_PRIMARY(bond->params.mode)) {
740 /* write lock already acquired */
741 if (bond->curr_active_slave)
742 dev_mc_del(bond->curr_active_slave->dev, addr);
746 bond_for_each_slave(bond, slave, i) {
747 dev_mc_del(slave->dev, addr);
753 static void __bond_resend_igmp_join_requests(struct net_device *dev)
755 struct in_device *in_dev;
758 in_dev = __in_dev_get_rcu(dev);
760 ip_mc_rejoin_groups(in_dev);
765 * Retrieve the list of registered multicast addresses for the bonding
766 * device and retransmit an IGMP JOIN request to the current active
769 static void bond_resend_igmp_join_requests(struct bonding *bond)
771 struct net_device *vlan_dev;
772 struct vlan_entry *vlan;
774 read_lock(&bond->lock);
776 /* rejoin all groups on bond device */
777 __bond_resend_igmp_join_requests(bond->dev);
779 /* rejoin all groups on vlan devices */
780 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
782 vlan_dev = __vlan_find_dev_deep(bond->dev,
786 __bond_resend_igmp_join_requests(vlan_dev);
789 if (--bond->igmp_retrans > 0)
790 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
792 read_unlock(&bond->lock);
795 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
797 struct bonding *bond = container_of(work, struct bonding,
799 bond_resend_igmp_join_requests(bond);
803 * flush all members of flush->mc_list from device dev->mc_list
805 static void bond_mc_list_flush(struct net_device *bond_dev,
806 struct net_device *slave_dev)
808 struct bonding *bond = netdev_priv(bond_dev);
809 struct netdev_hw_addr *ha;
811 netdev_for_each_mc_addr(ha, bond_dev)
812 dev_mc_del(slave_dev, ha->addr);
814 if (bond->params.mode == BOND_MODE_8023AD) {
815 /* del lacpdu mc addr from mc list */
816 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
818 dev_mc_del(slave_dev, lacpdu_multicast);
822 /*--------------------------- Active slave change ---------------------------*/
825 * Update the mc list and multicast-related flags for the new and
826 * old active slaves (if any) according to the multicast mode, and
827 * promiscuous flags unconditionally.
829 static void bond_mc_swap(struct bonding *bond, struct slave *new_active,
830 struct slave *old_active)
832 struct netdev_hw_addr *ha;
834 if (!USES_PRIMARY(bond->params.mode))
835 /* nothing to do - mc list is already up-to-date on
841 if (bond->dev->flags & IFF_PROMISC)
842 dev_set_promiscuity(old_active->dev, -1);
844 if (bond->dev->flags & IFF_ALLMULTI)
845 dev_set_allmulti(old_active->dev, -1);
847 netdev_for_each_mc_addr(ha, bond->dev)
848 dev_mc_del(old_active->dev, ha->addr);
852 /* FIXME: Signal errors upstream. */
853 if (bond->dev->flags & IFF_PROMISC)
854 dev_set_promiscuity(new_active->dev, 1);
856 if (bond->dev->flags & IFF_ALLMULTI)
857 dev_set_allmulti(new_active->dev, 1);
859 netdev_for_each_mc_addr(ha, bond->dev)
860 dev_mc_add(new_active->dev, ha->addr);
864 static struct slave *bond_get_old_active(struct bonding *bond,
865 struct slave *new_active)
870 bond_for_each_slave(bond, slave, i) {
871 if (slave == new_active)
874 if (!compare_ether_addr(bond->dev->dev_addr, slave->dev->dev_addr))
882 * bond_do_fail_over_mac
884 * Perform special MAC address swapping for fail_over_mac settings
886 * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh.
888 static void bond_do_fail_over_mac(struct bonding *bond,
889 struct slave *new_active,
890 struct slave *old_active)
891 __releases(&bond->curr_slave_lock)
892 __releases(&bond->lock)
893 __acquires(&bond->lock)
894 __acquires(&bond->curr_slave_lock)
896 u8 tmp_mac[ETH_ALEN];
897 struct sockaddr saddr;
900 switch (bond->params.fail_over_mac) {
901 case BOND_FOM_ACTIVE:
903 memcpy(bond->dev->dev_addr, new_active->dev->dev_addr,
904 new_active->dev->addr_len);
906 case BOND_FOM_FOLLOW:
908 * if new_active && old_active, swap them
909 * if just old_active, do nothing (going to no active slave)
910 * if just new_active, set new_active to bond's MAC
915 write_unlock_bh(&bond->curr_slave_lock);
916 read_unlock(&bond->lock);
919 old_active = bond_get_old_active(bond, new_active);
922 memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN);
923 memcpy(saddr.sa_data, old_active->dev->dev_addr,
925 saddr.sa_family = new_active->dev->type;
927 memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN);
928 saddr.sa_family = bond->dev->type;
931 rv = dev_set_mac_address(new_active->dev, &saddr);
933 pr_err("%s: Error %d setting MAC of slave %s\n",
934 bond->dev->name, -rv, new_active->dev->name);
941 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN);
942 saddr.sa_family = old_active->dev->type;
944 rv = dev_set_mac_address(old_active->dev, &saddr);
946 pr_err("%s: Error %d setting MAC of slave %s\n",
947 bond->dev->name, -rv, new_active->dev->name);
949 read_lock(&bond->lock);
950 write_lock_bh(&bond->curr_slave_lock);
953 pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n",
954 bond->dev->name, bond->params.fail_over_mac);
960 static bool bond_should_change_active(struct bonding *bond)
962 struct slave *prim = bond->primary_slave;
963 struct slave *curr = bond->curr_active_slave;
965 if (!prim || !curr || curr->link != BOND_LINK_UP)
967 if (bond->force_primary) {
968 bond->force_primary = false;
971 if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
972 (prim->speed < curr->speed ||
973 (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
975 if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
981 * find_best_interface - select the best available slave to be the active one
982 * @bond: our bonding struct
984 * Warning: Caller must hold curr_slave_lock for writing.
986 static struct slave *bond_find_best_slave(struct bonding *bond)
988 struct slave *new_active, *old_active;
989 struct slave *bestslave = NULL;
990 int mintime = bond->params.updelay;
993 new_active = bond->curr_active_slave;
995 if (!new_active) { /* there were no active slaves left */
996 if (bond->slave_cnt > 0) /* found one slave */
997 new_active = bond->first_slave;
999 return NULL; /* still no slave, return NULL */
1002 if ((bond->primary_slave) &&
1003 bond->primary_slave->link == BOND_LINK_UP &&
1004 bond_should_change_active(bond)) {
1005 new_active = bond->primary_slave;
1008 /* remember where to stop iterating over the slaves */
1009 old_active = new_active;
1011 bond_for_each_slave_from(bond, new_active, i, old_active) {
1012 if (new_active->link == BOND_LINK_UP) {
1014 } else if (new_active->link == BOND_LINK_BACK &&
1015 IS_UP(new_active->dev)) {
1016 /* link up, but waiting for stabilization */
1017 if (new_active->delay < mintime) {
1018 mintime = new_active->delay;
1019 bestslave = new_active;
1027 static bool bond_should_notify_peers(struct bonding *bond)
1029 struct slave *slave = bond->curr_active_slave;
1031 pr_debug("bond_should_notify_peers: bond %s slave %s\n",
1032 bond->dev->name, slave ? slave->dev->name : "NULL");
1034 if (!slave || !bond->send_peer_notif ||
1035 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
1038 bond->send_peer_notif--;
1043 * change_active_interface - change the active slave into the specified one
1044 * @bond: our bonding struct
1045 * @new: the new slave to make the active one
1047 * Set the new slave to the bond's settings and unset them on the old
1048 * curr_active_slave.
1049 * Setting include flags, mc-list, promiscuity, allmulti, etc.
1051 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1052 * because it is apparently the best available slave we have, even though its
1053 * updelay hasn't timed out yet.
1055 * If new_active is not NULL, caller must hold bond->lock for read and
1056 * curr_slave_lock for write_bh.
1058 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1060 struct slave *old_active = bond->curr_active_slave;
1062 if (old_active == new_active)
1066 new_active->jiffies = jiffies;
1068 if (new_active->link == BOND_LINK_BACK) {
1069 if (USES_PRIMARY(bond->params.mode)) {
1070 pr_info("%s: making interface %s the new active one %d ms earlier.\n",
1071 bond->dev->name, new_active->dev->name,
1072 (bond->params.updelay - new_active->delay) * bond->params.miimon);
1075 new_active->delay = 0;
1076 new_active->link = BOND_LINK_UP;
1078 if (bond->params.mode == BOND_MODE_8023AD)
1079 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1081 if (bond_is_lb(bond))
1082 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1084 if (USES_PRIMARY(bond->params.mode)) {
1085 pr_info("%s: making interface %s the new active one.\n",
1086 bond->dev->name, new_active->dev->name);
1091 if (USES_PRIMARY(bond->params.mode))
1092 bond_mc_swap(bond, new_active, old_active);
1094 if (bond_is_lb(bond)) {
1095 bond_alb_handle_active_change(bond, new_active);
1097 bond_set_slave_inactive_flags(old_active);
1099 bond_set_slave_active_flags(new_active);
1101 bond->curr_active_slave = new_active;
1104 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1106 bond_set_slave_inactive_flags(old_active);
1109 bool should_notify_peers = false;
1111 bond_set_slave_active_flags(new_active);
1113 if (bond->params.fail_over_mac)
1114 bond_do_fail_over_mac(bond, new_active,
1117 if (netif_running(bond->dev)) {
1118 bond->send_peer_notif =
1119 bond->params.num_peer_notif;
1120 should_notify_peers =
1121 bond_should_notify_peers(bond);
1124 write_unlock_bh(&bond->curr_slave_lock);
1125 read_unlock(&bond->lock);
1127 netdev_bonding_change(bond->dev, NETDEV_BONDING_FAILOVER);
1128 if (should_notify_peers)
1129 netdev_bonding_change(bond->dev,
1130 NETDEV_NOTIFY_PEERS);
1132 read_lock(&bond->lock);
1133 write_lock_bh(&bond->curr_slave_lock);
1137 /* resend IGMP joins since active slave has changed or
1138 * all were sent on curr_active_slave.
1139 * resend only if bond is brought up with the affected
1140 * bonding modes and the retransmission is enabled */
1141 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
1142 ((USES_PRIMARY(bond->params.mode) && new_active) ||
1143 bond->params.mode == BOND_MODE_ROUNDROBIN)) {
1144 bond->igmp_retrans = bond->params.resend_igmp;
1145 queue_delayed_work(bond->wq, &bond->mcast_work, 0);
1150 * bond_select_active_slave - select a new active slave, if needed
1151 * @bond: our bonding struct
1153 * This functions should be called when one of the following occurs:
1154 * - The old curr_active_slave has been released or lost its link.
1155 * - The primary_slave has got its link back.
1156 * - A slave has got its link back and there's no old curr_active_slave.
1158 * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
1160 void bond_select_active_slave(struct bonding *bond)
1162 struct slave *best_slave;
1165 best_slave = bond_find_best_slave(bond);
1166 if (best_slave != bond->curr_active_slave) {
1167 bond_change_active_slave(bond, best_slave);
1168 rv = bond_set_carrier(bond);
1172 if (netif_carrier_ok(bond->dev)) {
1173 pr_info("%s: first active interface up!\n",
1176 pr_info("%s: now running without any active interface !\n",
1182 /*--------------------------- slave list handling ---------------------------*/
1185 * This function attaches the slave to the end of list.
1187 * bond->lock held for writing by caller.
1189 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1191 if (bond->first_slave == NULL) { /* attaching the first slave */
1192 new_slave->next = new_slave;
1193 new_slave->prev = new_slave;
1194 bond->first_slave = new_slave;
1196 new_slave->next = bond->first_slave;
1197 new_slave->prev = bond->first_slave->prev;
1198 new_slave->next->prev = new_slave;
1199 new_slave->prev->next = new_slave;
1206 * This function detaches the slave from the list.
1207 * WARNING: no check is made to verify if the slave effectively
1208 * belongs to <bond>.
1209 * Nothing is freed on return, structures are just unchained.
1210 * If any slave pointer in bond was pointing to <slave>,
1211 * it should be changed by the calling function.
1213 * bond->lock held for writing by caller.
1215 static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1218 slave->next->prev = slave->prev;
1221 slave->prev->next = slave->next;
1223 if (bond->first_slave == slave) { /* slave is the first slave */
1224 if (bond->slave_cnt > 1) { /* there are more slave */
1225 bond->first_slave = slave->next;
1227 bond->first_slave = NULL; /* slave was the last one */
1236 #ifdef CONFIG_NET_POLL_CONTROLLER
1237 static inline int slave_enable_netpoll(struct slave *slave)
1242 np = kzalloc(sizeof(*np), GFP_KERNEL);
1247 np->dev = slave->dev;
1248 strlcpy(np->dev_name, slave->dev->name, IFNAMSIZ);
1249 err = __netpoll_setup(np);
1258 static inline void slave_disable_netpoll(struct slave *slave)
1260 struct netpoll *np = slave->np;
1266 synchronize_rcu_bh();
1267 __netpoll_cleanup(np);
1270 static inline bool slave_dev_support_netpoll(struct net_device *slave_dev)
1272 if (slave_dev->priv_flags & IFF_DISABLE_NETPOLL)
1274 if (!slave_dev->netdev_ops->ndo_poll_controller)
1279 static void bond_poll_controller(struct net_device *bond_dev)
1283 static void __bond_netpoll_cleanup(struct bonding *bond)
1285 struct slave *slave;
1288 bond_for_each_slave(bond, slave, i)
1289 if (IS_UP(slave->dev))
1290 slave_disable_netpoll(slave);
1292 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1294 struct bonding *bond = netdev_priv(bond_dev);
1296 read_lock(&bond->lock);
1297 __bond_netpoll_cleanup(bond);
1298 read_unlock(&bond->lock);
1301 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1303 struct bonding *bond = netdev_priv(dev);
1304 struct slave *slave;
1307 read_lock(&bond->lock);
1308 bond_for_each_slave(bond, slave, i) {
1309 err = slave_enable_netpoll(slave);
1311 __bond_netpoll_cleanup(bond);
1315 read_unlock(&bond->lock);
1319 static struct netpoll_info *bond_netpoll_info(struct bonding *bond)
1321 return bond->dev->npinfo;
1325 static inline int slave_enable_netpoll(struct slave *slave)
1329 static inline void slave_disable_netpoll(struct slave *slave)
1332 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1337 /*---------------------------------- IOCTL ----------------------------------*/
1339 static int bond_sethwaddr(struct net_device *bond_dev,
1340 struct net_device *slave_dev)
1342 pr_debug("bond_dev=%p\n", bond_dev);
1343 pr_debug("slave_dev=%p\n", slave_dev);
1344 pr_debug("slave_dev->addr_len=%d\n", slave_dev->addr_len);
1345 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
1349 static u32 bond_fix_features(struct net_device *dev, u32 features)
1351 struct slave *slave;
1352 struct bonding *bond = netdev_priv(dev);
1356 read_lock(&bond->lock);
1358 if (!bond->first_slave) {
1359 /* Disable adding VLANs to empty bond. But why? --mq */
1360 features |= NETIF_F_VLAN_CHALLENGED;
1365 features &= ~NETIF_F_ONE_FOR_ALL;
1366 features |= NETIF_F_ALL_FOR_ALL;
1368 bond_for_each_slave(bond, slave, i) {
1369 features = netdev_increment_features(features,
1370 slave->dev->features,
1375 read_unlock(&bond->lock);
1379 #define BOND_VLAN_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | \
1380 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1381 NETIF_F_HIGHDMA | NETIF_F_LRO)
1383 static void bond_compute_features(struct bonding *bond)
1385 struct slave *slave;
1386 struct net_device *bond_dev = bond->dev;
1387 u32 vlan_features = BOND_VLAN_FEATURES;
1388 unsigned short max_hard_header_len = ETH_HLEN;
1389 unsigned int gso_max_size = GSO_MAX_SIZE;
1390 u16 gso_max_segs = GSO_MAX_SEGS;
1393 read_lock(&bond->lock);
1395 if (!bond->first_slave)
1398 bond_for_each_slave(bond, slave, i) {
1399 vlan_features = netdev_increment_features(vlan_features,
1400 slave->dev->vlan_features, BOND_VLAN_FEATURES);
1402 if (slave->dev->hard_header_len > max_hard_header_len)
1403 max_hard_header_len = slave->dev->hard_header_len;
1405 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1406 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1410 bond_dev->vlan_features = vlan_features;
1411 bond_dev->hard_header_len = max_hard_header_len;
1412 bond_dev->gso_max_segs = gso_max_segs;
1413 netif_set_gso_max_size(bond_dev, gso_max_size);
1415 read_unlock(&bond->lock);
1417 netdev_change_features(bond_dev);
1420 static void bond_setup_by_slave(struct net_device *bond_dev,
1421 struct net_device *slave_dev)
1423 struct bonding *bond = netdev_priv(bond_dev);
1425 bond_dev->header_ops = slave_dev->header_ops;
1427 bond_dev->type = slave_dev->type;
1428 bond_dev->hard_header_len = slave_dev->hard_header_len;
1429 bond_dev->addr_len = slave_dev->addr_len;
1431 memcpy(bond_dev->broadcast, slave_dev->broadcast,
1432 slave_dev->addr_len);
1433 bond->setup_by_slave = 1;
1436 /* On bonding slaves other than the currently active slave, suppress
1437 * duplicates except for alb non-mcast/bcast.
1439 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1440 struct slave *slave,
1441 struct bonding *bond)
1443 if (bond_is_slave_inactive(slave)) {
1444 if (bond->params.mode == BOND_MODE_ALB &&
1445 skb->pkt_type != PACKET_BROADCAST &&
1446 skb->pkt_type != PACKET_MULTICAST)
1453 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1455 struct sk_buff *skb = *pskb;
1456 struct slave *slave;
1457 struct bonding *bond;
1458 void (*recv_probe)(struct sk_buff *, struct bonding *,
1461 skb = skb_share_check(skb, GFP_ATOMIC);
1463 return RX_HANDLER_CONSUMED;
1467 slave = bond_slave_get_rcu(skb->dev);
1470 if (bond->params.arp_interval)
1471 slave->dev->last_rx = jiffies;
1473 recv_probe = ACCESS_ONCE(bond->recv_probe);
1475 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
1478 recv_probe(nskb, bond, slave);
1479 dev_kfree_skb(nskb);
1483 if (bond_should_deliver_exact_match(skb, slave, bond)) {
1484 return RX_HANDLER_EXACT;
1487 skb->dev = bond->dev;
1489 if (bond->params.mode == BOND_MODE_ALB &&
1490 bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1491 skb->pkt_type == PACKET_HOST) {
1493 if (unlikely(skb_cow_head(skb,
1494 skb->data - skb_mac_header(skb)))) {
1496 return RX_HANDLER_CONSUMED;
1498 memcpy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, ETH_ALEN);
1501 return RX_HANDLER_ANOTHER;
1504 /* enslave device <slave> to bond device <master> */
1505 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1507 struct bonding *bond = netdev_priv(bond_dev);
1508 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1509 struct slave *new_slave = NULL;
1510 struct netdev_hw_addr *ha;
1511 struct sockaddr addr;
1515 if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
1516 slave_ops->ndo_do_ioctl == NULL) {
1517 pr_warning("%s: Warning: no link monitoring support for %s\n",
1518 bond_dev->name, slave_dev->name);
1521 /* already enslaved */
1522 if (slave_dev->flags & IFF_SLAVE) {
1523 pr_debug("Error, Device was already enslaved\n");
1527 /* vlan challenged mutual exclusion */
1528 /* no need to lock since we're protected by rtnl_lock */
1529 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1530 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1531 if (bond_vlan_used(bond)) {
1532 pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1533 bond_dev->name, slave_dev->name, bond_dev->name);
1536 pr_warning("%s: Warning: enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1537 bond_dev->name, slave_dev->name,
1538 slave_dev->name, bond_dev->name);
1541 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1545 * Old ifenslave binaries are no longer supported. These can
1546 * be identified with moderate accuracy by the state of the slave:
1547 * the current ifenslave will set the interface down prior to
1548 * enslaving it; the old ifenslave will not.
1550 if ((slave_dev->flags & IFF_UP)) {
1551 pr_err("%s is up. This may be due to an out of date ifenslave.\n",
1554 goto err_undo_flags;
1557 /* set bonding device ether type by slave - bonding netdevices are
1558 * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1559 * there is a need to override some of the type dependent attribs/funcs.
1561 * bond ether type mutual exclusion - don't allow slaves of dissimilar
1562 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1564 if (bond->slave_cnt == 0) {
1565 if (bond_dev->type != slave_dev->type) {
1566 pr_debug("%s: change device type from %d to %d\n",
1568 bond_dev->type, slave_dev->type);
1570 res = netdev_bonding_change(bond_dev,
1571 NETDEV_PRE_TYPE_CHANGE);
1572 res = notifier_to_errno(res);
1574 pr_err("%s: refused to change device type\n",
1577 goto err_undo_flags;
1580 /* Flush unicast and multicast addresses */
1581 dev_uc_flush(bond_dev);
1582 dev_mc_flush(bond_dev);
1584 if (slave_dev->type != ARPHRD_ETHER)
1585 bond_setup_by_slave(bond_dev, slave_dev);
1587 ether_setup(bond_dev);
1588 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1591 netdev_bonding_change(bond_dev,
1592 NETDEV_POST_TYPE_CHANGE);
1594 } else if (bond_dev->type != slave_dev->type) {
1595 pr_err("%s ether type (%d) is different from other slaves (%d), can not enslave it.\n",
1597 slave_dev->type, bond_dev->type);
1599 goto err_undo_flags;
1602 if (slave_ops->ndo_set_mac_address == NULL) {
1603 if (bond->slave_cnt == 0) {
1604 pr_warning("%s: Warning: The first slave device specified does not support setting the MAC address. Setting fail_over_mac to active.",
1606 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1607 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1608 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",
1611 goto err_undo_flags;
1615 call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1617 /* If this is the first slave, then we need to set the master's hardware
1618 * address to be the same as the slave's. */
1619 if (is_zero_ether_addr(bond->dev->dev_addr))
1620 memcpy(bond->dev->dev_addr, slave_dev->dev_addr,
1621 slave_dev->addr_len);
1624 new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1627 goto err_undo_flags;
1631 * Set the new_slave's queue_id to be zero. Queue ID mapping
1632 * is set via sysfs or module option if desired.
1634 new_slave->queue_id = 0;
1636 /* Save slave's original mtu and then set it to match the bond */
1637 new_slave->original_mtu = slave_dev->mtu;
1638 res = dev_set_mtu(slave_dev, bond->dev->mtu);
1640 pr_debug("Error %d calling dev_set_mtu\n", res);
1645 * Save slave's original ("permanent") mac address for modes
1646 * that need it, and for restoring it upon release, and then
1647 * set it to the master's address
1649 memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1651 if (!bond->params.fail_over_mac) {
1653 * Set slave to master's mac address. The application already
1654 * set the master's mac address to that of the first slave
1656 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1657 addr.sa_family = slave_dev->type;
1658 res = dev_set_mac_address(slave_dev, &addr);
1660 pr_debug("Error %d calling set_mac_address\n", res);
1661 goto err_restore_mtu;
1665 res = netdev_set_bond_master(slave_dev, bond_dev);
1667 pr_debug("Error %d calling netdev_set_bond_master\n", res);
1668 goto err_restore_mac;
1671 /* open the slave since the application closed it */
1672 res = dev_open(slave_dev);
1674 pr_debug("Opening slave %s failed\n", slave_dev->name);
1675 goto err_unset_master;
1678 new_slave->bond = bond;
1679 new_slave->dev = slave_dev;
1680 slave_dev->priv_flags |= IFF_BONDING;
1682 if (bond_is_lb(bond)) {
1683 /* bond_alb_init_slave() must be called before all other stages since
1684 * it might fail and we do not want to have to undo everything
1686 res = bond_alb_init_slave(bond, new_slave);
1691 /* If the mode USES_PRIMARY, then the new slave gets the
1692 * master's promisc (and mc) settings only if it becomes the
1693 * curr_active_slave, and that is taken care of later when calling
1694 * bond_change_active()
1696 if (!USES_PRIMARY(bond->params.mode)) {
1697 /* set promiscuity level to new slave */
1698 if (bond_dev->flags & IFF_PROMISC) {
1699 res = dev_set_promiscuity(slave_dev, 1);
1704 /* set allmulti level to new slave */
1705 if (bond_dev->flags & IFF_ALLMULTI) {
1706 res = dev_set_allmulti(slave_dev, 1);
1708 if (bond_dev->flags & IFF_PROMISC)
1709 dev_set_promiscuity(slave_dev, -1);
1714 netif_addr_lock_bh(bond_dev);
1715 /* upload master's mc_list to new slave */
1716 netdev_for_each_mc_addr(ha, bond_dev)
1717 dev_mc_add(slave_dev, ha->addr);
1718 netif_addr_unlock_bh(bond_dev);
1721 if (bond->params.mode == BOND_MODE_8023AD) {
1722 /* add lacpdu mc addr to mc list */
1723 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1725 dev_mc_add(slave_dev, lacpdu_multicast);
1728 bond_add_vlans_on_slave(bond, slave_dev);
1730 write_lock_bh(&bond->lock);
1732 bond_attach_slave(bond, new_slave);
1734 new_slave->delay = 0;
1735 new_slave->link_failure_count = 0;
1737 write_unlock_bh(&bond->lock);
1739 bond_compute_features(bond);
1741 bond_update_speed_duplex(new_slave);
1743 read_lock(&bond->lock);
1745 new_slave->last_arp_rx = jiffies;
1747 if (bond->params.miimon && !bond->params.use_carrier) {
1748 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1750 if ((link_reporting == -1) && !bond->params.arp_interval) {
1752 * miimon is set but a bonded network driver
1753 * does not support ETHTOOL/MII and
1754 * arp_interval is not set. Note: if
1755 * use_carrier is enabled, we will never go
1756 * here (because netif_carrier is always
1757 * supported); thus, we don't need to change
1758 * the messages for netif_carrier.
1760 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",
1761 bond_dev->name, slave_dev->name);
1762 } else if (link_reporting == -1) {
1763 /* unable get link status using mii/ethtool */
1764 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",
1765 bond_dev->name, slave_dev->name);
1769 /* check for initial state */
1770 if (!bond->params.miimon ||
1771 (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) {
1772 if (bond->params.updelay) {
1773 pr_debug("Initial state of slave_dev is BOND_LINK_BACK\n");
1774 new_slave->link = BOND_LINK_BACK;
1775 new_slave->delay = bond->params.updelay;
1777 pr_debug("Initial state of slave_dev is BOND_LINK_UP\n");
1778 new_slave->link = BOND_LINK_UP;
1780 new_slave->jiffies = jiffies;
1782 pr_debug("Initial state of slave_dev is BOND_LINK_DOWN\n");
1783 new_slave->link = BOND_LINK_DOWN;
1786 if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1787 /* if there is a primary slave, remember it */
1788 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1789 bond->primary_slave = new_slave;
1790 bond->force_primary = true;
1794 write_lock_bh(&bond->curr_slave_lock);
1796 switch (bond->params.mode) {
1797 case BOND_MODE_ACTIVEBACKUP:
1798 bond_set_slave_inactive_flags(new_slave);
1799 bond_select_active_slave(bond);
1801 case BOND_MODE_8023AD:
1802 /* in 802.3ad mode, the internal mechanism
1803 * will activate the slaves in the selected
1806 bond_set_slave_inactive_flags(new_slave);
1807 /* if this is the first slave */
1808 if (bond->slave_cnt == 1) {
1809 SLAVE_AD_INFO(new_slave).id = 1;
1810 /* Initialize AD with the number of times that the AD timer is called in 1 second
1811 * can be called only after the mac address of the bond is set
1813 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1815 SLAVE_AD_INFO(new_slave).id =
1816 SLAVE_AD_INFO(new_slave->prev).id + 1;
1819 bond_3ad_bind_slave(new_slave);
1823 bond_set_active_slave(new_slave);
1824 bond_set_slave_inactive_flags(new_slave);
1825 bond_select_active_slave(bond);
1828 pr_debug("This slave is always active in trunk mode\n");
1830 /* always active in trunk mode */
1831 bond_set_active_slave(new_slave);
1833 /* In trunking mode there is little meaning to curr_active_slave
1834 * anyway (it holds no special properties of the bond device),
1835 * so we can change it without calling change_active_interface()
1837 if (!bond->curr_active_slave)
1838 bond->curr_active_slave = new_slave;
1841 } /* switch(bond_mode) */
1843 write_unlock_bh(&bond->curr_slave_lock);
1845 bond_set_carrier(bond);
1847 #ifdef CONFIG_NET_POLL_CONTROLLER
1848 slave_dev->npinfo = bond_netpoll_info(bond);
1849 if (slave_dev->npinfo) {
1850 if (slave_enable_netpoll(new_slave)) {
1851 read_unlock(&bond->lock);
1852 pr_info("Error, %s: master_dev is using netpoll, "
1853 "but new slave device does not support netpoll.\n",
1861 read_unlock(&bond->lock);
1863 res = bond_create_slave_symlinks(bond_dev, slave_dev);
1867 res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1870 pr_debug("Error %d calling netdev_rx_handler_register\n", res);
1871 goto err_dest_symlinks;
1874 pr_info("%s: enslaving %s as a%s interface with a%s link.\n",
1875 bond_dev->name, slave_dev->name,
1876 bond_is_active_slave(new_slave) ? "n active" : " backup",
1877 new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1879 /* enslave is successful */
1882 /* Undo stages on error */
1884 bond_destroy_slave_symlinks(bond_dev, slave_dev);
1887 write_lock_bh(&bond->lock);
1888 bond_detach_slave(bond, new_slave);
1889 write_unlock_bh(&bond->lock);
1892 slave_dev->priv_flags &= ~IFF_BONDING;
1893 dev_close(slave_dev);
1896 netdev_set_bond_master(slave_dev, NULL);
1899 if (!bond->params.fail_over_mac) {
1900 /* XXX TODO - fom follow mode needs to change master's
1901 * MAC if this slave's MAC is in use by the bond, or at
1902 * least print a warning.
1904 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1905 addr.sa_family = slave_dev->type;
1906 dev_set_mac_address(slave_dev, &addr);
1910 dev_set_mtu(slave_dev, new_slave->original_mtu);
1916 bond_compute_features(bond);
1922 * Try to release the slave device <slave> from the bond device <master>
1923 * It is legal to access curr_active_slave without a lock because all the function
1926 * The rules for slave state should be:
1927 * for Active/Backup:
1928 * Active stays on all backups go down
1929 * for Bonded connections:
1930 * The first up interface should be left on and all others downed.
1932 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1934 struct bonding *bond = netdev_priv(bond_dev);
1935 struct slave *slave, *oldcurrent;
1936 struct sockaddr addr;
1937 int old_flags = bond_dev->flags;
1938 u32 old_features = bond_dev->features;
1940 /* slave is not a slave or master is not master of this slave */
1941 if (!(slave_dev->flags & IFF_SLAVE) ||
1942 (slave_dev->master != bond_dev)) {
1943 pr_err("%s: Error: cannot release %s.\n",
1944 bond_dev->name, slave_dev->name);
1949 netdev_bonding_change(bond_dev, NETDEV_RELEASE);
1950 write_lock_bh(&bond->lock);
1952 slave = bond_get_slave_by_dev(bond, slave_dev);
1954 /* not a slave of this bond */
1955 pr_info("%s: %s not enslaved\n",
1956 bond_dev->name, slave_dev->name);
1957 write_unlock_bh(&bond->lock);
1958 unblock_netpoll_tx();
1962 write_unlock_bh(&bond->lock);
1963 /* unregister rx_handler early so bond_handle_frame wouldn't be called
1964 * for this slave anymore.
1966 netdev_rx_handler_unregister(slave_dev);
1967 write_lock_bh(&bond->lock);
1969 if (!bond->params.fail_over_mac) {
1970 if (!compare_ether_addr(bond_dev->dev_addr, slave->perm_hwaddr) &&
1971 bond->slave_cnt > 1)
1972 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",
1973 bond_dev->name, slave_dev->name,
1975 bond_dev->name, slave_dev->name);
1978 /* Inform AD package of unbinding of slave. */
1979 if (bond->params.mode == BOND_MODE_8023AD) {
1980 /* must be called before the slave is
1981 * detached from the list
1983 bond_3ad_unbind_slave(slave);
1986 pr_info("%s: releasing %s interface %s\n",
1988 bond_is_active_slave(slave) ? "active" : "backup",
1991 oldcurrent = bond->curr_active_slave;
1993 bond->current_arp_slave = NULL;
1995 /* release the slave from its bond */
1996 bond_detach_slave(bond, slave);
1998 if (bond->primary_slave == slave)
1999 bond->primary_slave = NULL;
2001 if (oldcurrent == slave)
2002 bond_change_active_slave(bond, NULL);
2004 if (bond_is_lb(bond)) {
2005 /* Must be called only after the slave has been
2006 * detached from the list and the curr_active_slave
2007 * has been cleared (if our_slave == old_current),
2008 * but before a new active slave is selected.
2010 write_unlock_bh(&bond->lock);
2011 bond_alb_deinit_slave(bond, slave);
2012 write_lock_bh(&bond->lock);
2015 if (oldcurrent == slave) {
2017 * Note that we hold RTNL over this sequence, so there
2018 * is no concern that another slave add/remove event
2021 write_unlock_bh(&bond->lock);
2022 read_lock(&bond->lock);
2023 write_lock_bh(&bond->curr_slave_lock);
2025 bond_select_active_slave(bond);
2027 write_unlock_bh(&bond->curr_slave_lock);
2028 read_unlock(&bond->lock);
2029 write_lock_bh(&bond->lock);
2032 if (bond->slave_cnt == 0) {
2033 bond_set_carrier(bond);
2035 /* if the last slave was removed, zero the mac address
2036 * of the master so it will be set by the application
2037 * to the mac address of the first slave
2039 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
2041 if (bond_vlan_used(bond)) {
2042 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
2043 bond_dev->name, bond_dev->name);
2044 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
2049 write_unlock_bh(&bond->lock);
2050 unblock_netpoll_tx();
2052 bond_compute_features(bond);
2053 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
2054 (old_features & NETIF_F_VLAN_CHALLENGED))
2055 pr_info("%s: last VLAN challenged slave %s left bond %s. VLAN blocking is removed\n",
2056 bond_dev->name, slave_dev->name, bond_dev->name);
2058 /* must do this from outside any spinlocks */
2059 bond_destroy_slave_symlinks(bond_dev, slave_dev);
2061 bond_del_vlans_from_slave(bond, slave_dev);
2063 /* If the mode USES_PRIMARY, then we should only remove its
2064 * promisc and mc settings if it was the curr_active_slave, but that was
2065 * already taken care of above when we detached the slave
2067 if (!USES_PRIMARY(bond->params.mode)) {
2068 /* unset promiscuity level from slave
2069 * NOTE: The NETDEV_CHANGEADDR call above may change the value
2070 * of the IFF_PROMISC flag in the bond_dev, but we need the
2071 * value of that flag before that change, as that was the value
2072 * when this slave was attached, so we cache at the start of the
2073 * function and use it here. Same goes for ALLMULTI below
2075 if (old_flags & IFF_PROMISC)
2076 dev_set_promiscuity(slave_dev, -1);
2078 /* unset allmulti level from slave */
2079 if (old_flags & IFF_ALLMULTI)
2080 dev_set_allmulti(slave_dev, -1);
2082 /* flush master's mc_list from slave */
2083 netif_addr_lock_bh(bond_dev);
2084 bond_mc_list_flush(bond_dev, slave_dev);
2085 netif_addr_unlock_bh(bond_dev);
2088 netdev_set_bond_master(slave_dev, NULL);
2090 slave_disable_netpoll(slave);
2092 /* close slave before restoring its mac address */
2093 dev_close(slave_dev);
2095 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
2096 /* restore original ("permanent") mac address */
2097 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2098 addr.sa_family = slave_dev->type;
2099 dev_set_mac_address(slave_dev, &addr);
2102 dev_set_mtu(slave_dev, slave->original_mtu);
2104 slave_dev->priv_flags &= ~IFF_BONDING;
2108 return 0; /* deletion OK */
2112 * First release a slave and then destroy the bond if no more slaves are left.
2113 * Must be under rtnl_lock when this function is called.
2115 static int bond_release_and_destroy(struct net_device *bond_dev,
2116 struct net_device *slave_dev)
2118 struct bonding *bond = netdev_priv(bond_dev);
2121 ret = bond_release(bond_dev, slave_dev);
2122 if ((ret == 0) && (bond->slave_cnt == 0)) {
2123 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
2124 pr_info("%s: destroying bond %s.\n",
2125 bond_dev->name, bond_dev->name);
2126 unregister_netdevice(bond_dev);
2132 * This function releases all slaves.
2134 static int bond_release_all(struct net_device *bond_dev)
2136 struct bonding *bond = netdev_priv(bond_dev);
2137 struct slave *slave;
2138 struct net_device *slave_dev;
2139 struct sockaddr addr;
2141 write_lock_bh(&bond->lock);
2143 netif_carrier_off(bond_dev);
2145 if (bond->slave_cnt == 0)
2148 bond->current_arp_slave = NULL;
2149 bond->primary_slave = NULL;
2150 bond_change_active_slave(bond, NULL);
2152 while ((slave = bond->first_slave) != NULL) {
2153 /* Inform AD package of unbinding of slave
2154 * before slave is detached from the list.
2156 if (bond->params.mode == BOND_MODE_8023AD)
2157 bond_3ad_unbind_slave(slave);
2159 slave_dev = slave->dev;
2160 bond_detach_slave(bond, slave);
2162 /* now that the slave is detached, unlock and perform
2163 * all the undo steps that should not be called from
2166 write_unlock_bh(&bond->lock);
2168 /* unregister rx_handler early so bond_handle_frame wouldn't
2169 * be called for this slave anymore.
2171 netdev_rx_handler_unregister(slave_dev);
2174 if (bond_is_lb(bond)) {
2175 /* must be called only after the slave
2176 * has been detached from the list
2178 bond_alb_deinit_slave(bond, slave);
2181 bond_destroy_slave_symlinks(bond_dev, slave_dev);
2182 bond_del_vlans_from_slave(bond, slave_dev);
2184 /* If the mode USES_PRIMARY, then we should only remove its
2185 * promisc and mc settings if it was the curr_active_slave, but that was
2186 * already taken care of above when we detached the slave
2188 if (!USES_PRIMARY(bond->params.mode)) {
2189 /* unset promiscuity level from slave */
2190 if (bond_dev->flags & IFF_PROMISC)
2191 dev_set_promiscuity(slave_dev, -1);
2193 /* unset allmulti level from slave */
2194 if (bond_dev->flags & IFF_ALLMULTI)
2195 dev_set_allmulti(slave_dev, -1);
2197 /* flush master's mc_list from slave */
2198 netif_addr_lock_bh(bond_dev);
2199 bond_mc_list_flush(bond_dev, slave_dev);
2200 netif_addr_unlock_bh(bond_dev);
2203 netdev_set_bond_master(slave_dev, NULL);
2205 slave_disable_netpoll(slave);
2207 /* close slave before restoring its mac address */
2208 dev_close(slave_dev);
2210 if (!bond->params.fail_over_mac) {
2211 /* restore original ("permanent") mac address*/
2212 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2213 addr.sa_family = slave_dev->type;
2214 dev_set_mac_address(slave_dev, &addr);
2219 /* re-acquire the lock before getting the next slave */
2220 write_lock_bh(&bond->lock);
2223 /* zero the mac address of the master so it will be
2224 * set by the application to the mac address of the
2227 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
2229 if (bond_vlan_used(bond)) {
2230 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
2231 bond_dev->name, bond_dev->name);
2232 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
2236 pr_info("%s: released all slaves\n", bond_dev->name);
2239 write_unlock_bh(&bond->lock);
2241 bond_compute_features(bond);
2247 * This function changes the active slave to slave <slave_dev>.
2248 * It returns -EINVAL in the following cases.
2249 * - <slave_dev> is not found in the list.
2250 * - There is not active slave now.
2251 * - <slave_dev> is already active.
2252 * - The link state of <slave_dev> is not BOND_LINK_UP.
2253 * - <slave_dev> is not running.
2254 * In these cases, this function does nothing.
2255 * In the other cases, current_slave pointer is changed and 0 is returned.
2257 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
2259 struct bonding *bond = netdev_priv(bond_dev);
2260 struct slave *old_active = NULL;
2261 struct slave *new_active = NULL;
2264 if (!USES_PRIMARY(bond->params.mode))
2267 /* Verify that master_dev is indeed the master of slave_dev */
2268 if (!(slave_dev->flags & IFF_SLAVE) || (slave_dev->master != bond_dev))
2271 read_lock(&bond->lock);
2273 read_lock(&bond->curr_slave_lock);
2274 old_active = bond->curr_active_slave;
2275 read_unlock(&bond->curr_slave_lock);
2277 new_active = bond_get_slave_by_dev(bond, slave_dev);
2280 * Changing to the current active: do nothing; return success.
2282 if (new_active && (new_active == old_active)) {
2283 read_unlock(&bond->lock);
2289 (new_active->link == BOND_LINK_UP) &&
2290 IS_UP(new_active->dev)) {
2292 write_lock_bh(&bond->curr_slave_lock);
2293 bond_change_active_slave(bond, new_active);
2294 write_unlock_bh(&bond->curr_slave_lock);
2295 unblock_netpoll_tx();
2299 read_unlock(&bond->lock);
2304 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2306 struct bonding *bond = netdev_priv(bond_dev);
2308 info->bond_mode = bond->params.mode;
2309 info->miimon = bond->params.miimon;
2311 read_lock(&bond->lock);
2312 info->num_slaves = bond->slave_cnt;
2313 read_unlock(&bond->lock);
2318 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2320 struct bonding *bond = netdev_priv(bond_dev);
2321 struct slave *slave;
2322 int i, res = -ENODEV;
2324 read_lock(&bond->lock);
2326 bond_for_each_slave(bond, slave, i) {
2327 if (i == (int)info->slave_id) {
2329 strcpy(info->slave_name, slave->dev->name);
2330 info->link = slave->link;
2331 info->state = bond_slave_state(slave);
2332 info->link_failure_count = slave->link_failure_count;
2337 read_unlock(&bond->lock);
2342 /*-------------------------------- Monitoring -------------------------------*/
2345 static int bond_miimon_inspect(struct bonding *bond)
2347 struct slave *slave;
2348 int i, link_state, commit = 0;
2349 bool ignore_updelay;
2351 ignore_updelay = !bond->curr_active_slave ? true : false;
2353 bond_for_each_slave(bond, slave, i) {
2354 slave->new_link = BOND_LINK_NOCHANGE;
2356 link_state = bond_check_dev_link(bond, slave->dev, 0);
2358 switch (slave->link) {
2363 slave->link = BOND_LINK_FAIL;
2364 slave->delay = bond->params.downdelay;
2366 pr_info("%s: link status down for %sinterface %s, disabling it in %d ms.\n",
2368 (bond->params.mode ==
2369 BOND_MODE_ACTIVEBACKUP) ?
2370 (bond_is_active_slave(slave) ?
2371 "active " : "backup ") : "",
2373 bond->params.downdelay * bond->params.miimon);
2376 case BOND_LINK_FAIL:
2379 * recovered before downdelay expired
2381 slave->link = BOND_LINK_UP;
2382 slave->jiffies = jiffies;
2383 pr_info("%s: link status up again after %d ms for interface %s.\n",
2385 (bond->params.downdelay - slave->delay) *
2386 bond->params.miimon,
2391 if (slave->delay <= 0) {
2392 slave->new_link = BOND_LINK_DOWN;
2400 case BOND_LINK_DOWN:
2404 slave->link = BOND_LINK_BACK;
2405 slave->delay = bond->params.updelay;
2408 pr_info("%s: link status up for interface %s, enabling it in %d ms.\n",
2409 bond->dev->name, slave->dev->name,
2410 ignore_updelay ? 0 :
2411 bond->params.updelay *
2412 bond->params.miimon);
2415 case BOND_LINK_BACK:
2417 slave->link = BOND_LINK_DOWN;
2418 pr_info("%s: link status down again after %d ms for interface %s.\n",
2420 (bond->params.updelay - slave->delay) *
2421 bond->params.miimon,
2430 if (slave->delay <= 0) {
2431 slave->new_link = BOND_LINK_UP;
2433 ignore_updelay = false;
2445 static void bond_miimon_commit(struct bonding *bond)
2447 struct slave *slave;
2450 bond_for_each_slave(bond, slave, i) {
2451 switch (slave->new_link) {
2452 case BOND_LINK_NOCHANGE:
2456 slave->link = BOND_LINK_UP;
2457 slave->jiffies = jiffies;
2459 if (bond->params.mode == BOND_MODE_8023AD) {
2460 /* prevent it from being the active one */
2461 bond_set_backup_slave(slave);
2462 } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2463 /* make it immediately active */
2464 bond_set_active_slave(slave);
2465 } else if (slave != bond->primary_slave) {
2466 /* prevent it from being the active one */
2467 bond_set_backup_slave(slave);
2470 pr_info("%s: link status definitely up for interface %s, %u Mbps %s duplex.\n",
2471 bond->dev->name, slave->dev->name,
2472 slave->speed, slave->duplex ? "full" : "half");
2474 /* notify ad that the link status has changed */
2475 if (bond->params.mode == BOND_MODE_8023AD)
2476 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2478 if (bond_is_lb(bond))
2479 bond_alb_handle_link_change(bond, slave,
2482 if (!bond->curr_active_slave ||
2483 (slave == bond->primary_slave))
2488 case BOND_LINK_DOWN:
2489 if (slave->link_failure_count < UINT_MAX)
2490 slave->link_failure_count++;
2492 slave->link = BOND_LINK_DOWN;
2494 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
2495 bond->params.mode == BOND_MODE_8023AD)
2496 bond_set_slave_inactive_flags(slave);
2498 pr_info("%s: link status definitely down for interface %s, disabling it\n",
2499 bond->dev->name, slave->dev->name);
2501 if (bond->params.mode == BOND_MODE_8023AD)
2502 bond_3ad_handle_link_change(slave,
2505 if (bond_is_lb(bond))
2506 bond_alb_handle_link_change(bond, slave,
2509 if (slave == bond->curr_active_slave)
2515 pr_err("%s: invalid new link %d on slave %s\n",
2516 bond->dev->name, slave->new_link,
2518 slave->new_link = BOND_LINK_NOCHANGE;
2526 write_lock_bh(&bond->curr_slave_lock);
2527 bond_select_active_slave(bond);
2528 write_unlock_bh(&bond->curr_slave_lock);
2529 unblock_netpoll_tx();
2532 bond_set_carrier(bond);
2538 * Really a wrapper that splits the mii monitor into two phases: an
2539 * inspection, then (if inspection indicates something needs to be done)
2540 * an acquisition of appropriate locks followed by a commit phase to
2541 * implement whatever link state changes are indicated.
2543 void bond_mii_monitor(struct work_struct *work)
2545 struct bonding *bond = container_of(work, struct bonding,
2547 bool should_notify_peers = false;
2548 unsigned long delay;
2550 read_lock(&bond->lock);
2552 delay = msecs_to_jiffies(bond->params.miimon);
2554 if (bond->slave_cnt == 0)
2557 should_notify_peers = bond_should_notify_peers(bond);
2559 if (bond_miimon_inspect(bond)) {
2560 read_unlock(&bond->lock);
2562 /* Race avoidance with bond_close cancel of workqueue */
2563 if (!rtnl_trylock()) {
2564 read_lock(&bond->lock);
2566 should_notify_peers = false;
2570 read_lock(&bond->lock);
2572 bond_miimon_commit(bond);
2574 read_unlock(&bond->lock);
2575 rtnl_unlock(); /* might sleep, hold no other locks */
2576 read_lock(&bond->lock);
2580 if (bond->params.miimon)
2581 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2583 read_unlock(&bond->lock);
2585 if (should_notify_peers) {
2586 if (!rtnl_trylock()) {
2587 read_lock(&bond->lock);
2588 bond->send_peer_notif++;
2589 read_unlock(&bond->lock);
2592 netdev_bonding_change(bond->dev, NETDEV_NOTIFY_PEERS);
2597 static int bond_has_this_ip(struct bonding *bond, __be32 ip)
2599 struct vlan_entry *vlan;
2601 if (ip == bond->master_ip)
2604 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2605 if (ip == vlan->vlan_ip)
2613 * We go to the (large) trouble of VLAN tagging ARP frames because
2614 * switches in VLAN mode (especially if ports are configured as
2615 * "native" to a VLAN) might not pass non-tagged frames.
2617 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2619 struct sk_buff *skb;
2621 pr_debug("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2622 slave_dev->name, dest_ip, src_ip, vlan_id);
2624 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2625 NULL, slave_dev->dev_addr, NULL);
2628 pr_err("ARP packet allocation failed\n");
2632 skb = vlan_put_tag(skb, vlan_id);
2634 pr_err("failed to insert VLAN tag\n");
2642 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2645 __be32 *targets = bond->params.arp_targets;
2646 struct vlan_entry *vlan;
2647 struct net_device *vlan_dev;
2650 for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2653 pr_debug("basa: target %x\n", targets[i]);
2654 if (!bond_vlan_used(bond)) {
2655 pr_debug("basa: empty vlan: arp_send\n");
2656 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2657 bond->master_ip, 0);
2662 * If VLANs are configured, we do a route lookup to
2663 * determine which VLAN interface would be used, so we
2664 * can tag the ARP with the proper VLAN tag.
2666 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2669 if (net_ratelimit()) {
2670 pr_warning("%s: no route to arp_ip_target %pI4\n",
2671 bond->dev->name, &targets[i]);
2677 * This target is not on a VLAN
2679 if (rt->dst.dev == bond->dev) {
2681 pr_debug("basa: rtdev == bond->dev: arp_send\n");
2682 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2683 bond->master_ip, 0);
2688 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2690 vlan_dev = __vlan_find_dev_deep(bond->dev,
2693 if (vlan_dev == rt->dst.dev) {
2694 vlan_id = vlan->vlan_id;
2695 pr_debug("basa: vlan match on %s %d\n",
2696 vlan_dev->name, vlan_id);
2703 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2704 vlan->vlan_ip, vlan_id);
2708 if (net_ratelimit()) {
2709 pr_warning("%s: no path to arp_ip_target %pI4 via rt.dev %s\n",
2710 bond->dev->name, &targets[i],
2711 rt->dst.dev ? rt->dst.dev->name : "NULL");
2717 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2720 __be32 *targets = bond->params.arp_targets;
2722 for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2723 pr_debug("bva: sip %pI4 tip %pI4 t[%d] %pI4 bhti(tip) %d\n",
2724 &sip, &tip, i, &targets[i],
2725 bond_has_this_ip(bond, tip));
2726 if (sip == targets[i]) {
2727 if (bond_has_this_ip(bond, tip))
2728 slave->last_arp_rx = jiffies;
2734 static void bond_arp_rcv(struct sk_buff *skb, struct bonding *bond,
2735 struct slave *slave)
2738 unsigned char *arp_ptr;
2741 if (skb->protocol != __cpu_to_be16(ETH_P_ARP))
2744 read_lock(&bond->lock);
2746 pr_debug("bond_arp_rcv: bond %s skb->dev %s\n",
2747 bond->dev->name, skb->dev->name);
2749 if (!pskb_may_pull(skb, arp_hdr_len(bond->dev)))
2753 if (arp->ar_hln != bond->dev->addr_len ||
2754 skb->pkt_type == PACKET_OTHERHOST ||
2755 skb->pkt_type == PACKET_LOOPBACK ||
2756 arp->ar_hrd != htons(ARPHRD_ETHER) ||
2757 arp->ar_pro != htons(ETH_P_IP) ||
2761 arp_ptr = (unsigned char *)(arp + 1);
2762 arp_ptr += bond->dev->addr_len;
2763 memcpy(&sip, arp_ptr, 4);
2764 arp_ptr += 4 + bond->dev->addr_len;
2765 memcpy(&tip, arp_ptr, 4);
2767 pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2768 bond->dev->name, slave->dev->name, bond_slave_state(slave),
2769 bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2773 * Backup slaves won't see the ARP reply, but do come through
2774 * here for each ARP probe (so we swap the sip/tip to validate
2775 * the probe). In a "redundant switch, common router" type of
2776 * configuration, the ARP probe will (hopefully) travel from
2777 * the active, through one switch, the router, then the other
2778 * switch before reaching the backup.
2780 if (bond_is_active_slave(slave))
2781 bond_validate_arp(bond, slave, sip, tip);
2783 bond_validate_arp(bond, slave, tip, sip);
2786 read_unlock(&bond->lock);
2790 * this function is called regularly to monitor each slave's link
2791 * ensuring that traffic is being sent and received when arp monitoring
2792 * is used in load-balancing mode. if the adapter has been dormant, then an
2793 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2794 * arp monitoring in active backup mode.
2796 void bond_loadbalance_arp_mon(struct work_struct *work)
2798 struct bonding *bond = container_of(work, struct bonding,
2800 struct slave *slave, *oldcurrent;
2801 int do_failover = 0;
2805 read_lock(&bond->lock);
2807 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2809 if (bond->slave_cnt == 0)
2812 read_lock(&bond->curr_slave_lock);
2813 oldcurrent = bond->curr_active_slave;
2814 read_unlock(&bond->curr_slave_lock);
2816 /* see if any of the previous devices are up now (i.e. they have
2817 * xmt and rcv traffic). the curr_active_slave does not come into
2818 * the picture unless it is null. also, slave->jiffies is not needed
2819 * here because we send an arp on each slave and give a slave as
2820 * long as it needs to get the tx/rx within the delta.
2821 * TODO: what about up/down delay in arp mode? it wasn't here before
2824 bond_for_each_slave(bond, slave, i) {
2825 unsigned long trans_start = dev_trans_start(slave->dev);
2827 if (slave->link != BOND_LINK_UP) {
2828 if (time_in_range(jiffies,
2829 trans_start - delta_in_ticks,
2830 trans_start + delta_in_ticks) &&
2831 time_in_range(jiffies,
2832 slave->dev->last_rx - delta_in_ticks,
2833 slave->dev->last_rx + delta_in_ticks)) {
2835 slave->link = BOND_LINK_UP;
2836 bond_set_active_slave(slave);
2838 /* primary_slave has no meaning in round-robin
2839 * mode. the window of a slave being up and
2840 * curr_active_slave being null after enslaving
2844 pr_info("%s: link status definitely up for interface %s, ",
2849 pr_info("%s: interface %s is now up\n",
2855 /* slave->link == BOND_LINK_UP */
2857 /* not all switches will respond to an arp request
2858 * when the source ip is 0, so don't take the link down
2859 * if we don't know our ip yet
2861 if (!time_in_range(jiffies,
2862 trans_start - delta_in_ticks,
2863 trans_start + 2 * delta_in_ticks) ||
2864 !time_in_range(jiffies,
2865 slave->dev->last_rx - delta_in_ticks,
2866 slave->dev->last_rx + 2 * delta_in_ticks)) {
2868 slave->link = BOND_LINK_DOWN;
2869 bond_set_backup_slave(slave);
2871 if (slave->link_failure_count < UINT_MAX)
2872 slave->link_failure_count++;
2874 pr_info("%s: interface %s is now down.\n",
2878 if (slave == oldcurrent)
2883 /* note: if switch is in round-robin mode, all links
2884 * must tx arp to ensure all links rx an arp - otherwise
2885 * links may oscillate or not come up at all; if switch is
2886 * in something like xor mode, there is nothing we can
2887 * do - all replies will be rx'ed on same link causing slaves
2888 * to be unstable during low/no traffic periods
2890 if (IS_UP(slave->dev))
2891 bond_arp_send_all(bond, slave);
2896 write_lock_bh(&bond->curr_slave_lock);
2898 bond_select_active_slave(bond);
2900 write_unlock_bh(&bond->curr_slave_lock);
2901 unblock_netpoll_tx();
2905 if (bond->params.arp_interval)
2906 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2908 read_unlock(&bond->lock);
2912 * Called to inspect slaves for active-backup mode ARP monitor link state
2913 * changes. Sets new_link in slaves to specify what action should take
2914 * place for the slave. Returns 0 if no changes are found, >0 if changes
2915 * to link states must be committed.
2917 * Called with bond->lock held for read.
2919 static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks)
2921 struct slave *slave;
2923 unsigned long trans_start;
2925 bond_for_each_slave(bond, slave, i) {
2926 slave->new_link = BOND_LINK_NOCHANGE;
2928 if (slave->link != BOND_LINK_UP) {
2929 if (time_in_range(jiffies,
2930 slave_last_rx(bond, slave) - delta_in_ticks,
2931 slave_last_rx(bond, slave) + delta_in_ticks)) {
2933 slave->new_link = BOND_LINK_UP;
2941 * Give slaves 2*delta after being enslaved or made
2942 * active. This avoids bouncing, as the last receive
2943 * times need a full ARP monitor cycle to be updated.
2945 if (time_in_range(jiffies,
2946 slave->jiffies - delta_in_ticks,
2947 slave->jiffies + 2 * delta_in_ticks))
2951 * Backup slave is down if:
2952 * - No current_arp_slave AND
2953 * - more than 3*delta since last receive AND
2954 * - the bond has an IP address
2956 * Note: a non-null current_arp_slave indicates
2957 * the curr_active_slave went down and we are
2958 * searching for a new one; under this condition
2959 * we only take the curr_active_slave down - this
2960 * gives each slave a chance to tx/rx traffic
2961 * before being taken out
2963 if (!bond_is_active_slave(slave) &&
2964 !bond->current_arp_slave &&
2965 !time_in_range(jiffies,
2966 slave_last_rx(bond, slave) - delta_in_ticks,
2967 slave_last_rx(bond, slave) + 3 * delta_in_ticks)) {
2969 slave->new_link = BOND_LINK_DOWN;
2974 * Active slave is down if:
2975 * - more than 2*delta since transmitting OR
2976 * - (more than 2*delta since receive AND
2977 * the bond has an IP address)
2979 trans_start = dev_trans_start(slave->dev);
2980 if (bond_is_active_slave(slave) &&
2981 (!time_in_range(jiffies,
2982 trans_start - delta_in_ticks,
2983 trans_start + 2 * delta_in_ticks) ||
2984 !time_in_range(jiffies,
2985 slave_last_rx(bond, slave) - delta_in_ticks,
2986 slave_last_rx(bond, slave) + 2 * delta_in_ticks))) {
2988 slave->new_link = BOND_LINK_DOWN;
2997 * Called to commit link state changes noted by inspection step of
2998 * active-backup mode ARP monitor.
3000 * Called with RTNL and bond->lock for read.
3002 static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks)
3004 struct slave *slave;
3006 unsigned long trans_start;
3008 bond_for_each_slave(bond, slave, i) {
3009 switch (slave->new_link) {
3010 case BOND_LINK_NOCHANGE:
3014 trans_start = dev_trans_start(slave->dev);
3015 if ((!bond->curr_active_slave &&
3016 time_in_range(jiffies,
3017 trans_start - delta_in_ticks,
3018 trans_start + delta_in_ticks)) ||
3019 bond->curr_active_slave != slave) {
3020 slave->link = BOND_LINK_UP;
3021 if (bond->current_arp_slave) {
3022 bond_set_slave_inactive_flags(
3023 bond->current_arp_slave);
3024 bond->current_arp_slave = NULL;
3027 pr_info("%s: link status definitely up for interface %s.\n",
3028 bond->dev->name, slave->dev->name);
3030 if (!bond->curr_active_slave ||
3031 (slave == bond->primary_slave))
3038 case BOND_LINK_DOWN:
3039 if (slave->link_failure_count < UINT_MAX)
3040 slave->link_failure_count++;
3042 slave->link = BOND_LINK_DOWN;
3043 bond_set_slave_inactive_flags(slave);
3045 pr_info("%s: link status definitely down for interface %s, disabling it\n",
3046 bond->dev->name, slave->dev->name);
3048 if (slave == bond->curr_active_slave) {
3049 bond->current_arp_slave = NULL;
3056 pr_err("%s: impossible: new_link %d on slave %s\n",
3057 bond->dev->name, slave->new_link,
3065 write_lock_bh(&bond->curr_slave_lock);
3066 bond_select_active_slave(bond);
3067 write_unlock_bh(&bond->curr_slave_lock);
3068 unblock_netpoll_tx();
3071 bond_set_carrier(bond);
3075 * Send ARP probes for active-backup mode ARP monitor.
3077 * Called with bond->lock held for read.
3079 static void bond_ab_arp_probe(struct bonding *bond)
3081 struct slave *slave;
3084 read_lock(&bond->curr_slave_lock);
3086 if (bond->current_arp_slave && bond->curr_active_slave)
3087 pr_info("PROBE: c_arp %s && cas %s BAD\n",
3088 bond->current_arp_slave->dev->name,
3089 bond->curr_active_slave->dev->name);
3091 if (bond->curr_active_slave) {
3092 bond_arp_send_all(bond, bond->curr_active_slave);
3093 read_unlock(&bond->curr_slave_lock);
3097 read_unlock(&bond->curr_slave_lock);
3099 /* if we don't have a curr_active_slave, search for the next available
3100 * backup slave from the current_arp_slave and make it the candidate
3101 * for becoming the curr_active_slave
3104 if (!bond->current_arp_slave) {
3105 bond->current_arp_slave = bond->first_slave;
3106 if (!bond->current_arp_slave)
3110 bond_set_slave_inactive_flags(bond->current_arp_slave);
3112 /* search for next candidate */
3113 bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
3114 if (IS_UP(slave->dev)) {
3115 slave->link = BOND_LINK_BACK;
3116 bond_set_slave_active_flags(slave);
3117 bond_arp_send_all(bond, slave);
3118 slave->jiffies = jiffies;
3119 bond->current_arp_slave = slave;
3123 /* if the link state is up at this point, we
3124 * mark it down - this can happen if we have
3125 * simultaneous link failures and
3126 * reselect_active_interface doesn't make this
3127 * one the current slave so it is still marked
3128 * up when it is actually down
3130 if (slave->link == BOND_LINK_UP) {
3131 slave->link = BOND_LINK_DOWN;
3132 if (slave->link_failure_count < UINT_MAX)
3133 slave->link_failure_count++;
3135 bond_set_slave_inactive_flags(slave);
3137 pr_info("%s: backup interface %s is now down.\n",
3138 bond->dev->name, slave->dev->name);
3143 void bond_activebackup_arp_mon(struct work_struct *work)
3145 struct bonding *bond = container_of(work, struct bonding,
3147 bool should_notify_peers = false;
3150 read_lock(&bond->lock);
3152 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3154 if (bond->slave_cnt == 0)
3157 should_notify_peers = bond_should_notify_peers(bond);
3159 if (bond_ab_arp_inspect(bond, delta_in_ticks)) {
3160 read_unlock(&bond->lock);
3162 /* Race avoidance with bond_close flush of workqueue */
3163 if (!rtnl_trylock()) {
3164 read_lock(&bond->lock);
3166 should_notify_peers = false;
3170 read_lock(&bond->lock);
3172 bond_ab_arp_commit(bond, delta_in_ticks);
3174 read_unlock(&bond->lock);
3176 read_lock(&bond->lock);
3179 bond_ab_arp_probe(bond);
3182 if (bond->params.arp_interval)
3183 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3185 read_unlock(&bond->lock);
3187 if (should_notify_peers) {
3188 if (!rtnl_trylock()) {
3189 read_lock(&bond->lock);
3190 bond->send_peer_notif++;
3191 read_unlock(&bond->lock);
3194 netdev_bonding_change(bond->dev, NETDEV_NOTIFY_PEERS);
3199 /*-------------------------- netdev event handling --------------------------*/
3202 * Change device name
3204 static int bond_event_changename(struct bonding *bond)
3206 bond_remove_proc_entry(bond);
3207 bond_create_proc_entry(bond);
3209 bond_debug_reregister(bond);
3214 static int bond_master_netdev_event(unsigned long event,
3215 struct net_device *bond_dev)
3217 struct bonding *event_bond = netdev_priv(bond_dev);
3220 case NETDEV_CHANGENAME:
3221 return bond_event_changename(event_bond);
3222 case NETDEV_UNREGISTER:
3223 bond_remove_proc_entry(event_bond);
3225 case NETDEV_REGISTER:
3226 bond_create_proc_entry(event_bond);
3235 static int bond_slave_netdev_event(unsigned long event,
3236 struct net_device *slave_dev)
3238 struct net_device *bond_dev = slave_dev->master;
3239 struct bonding *bond = netdev_priv(bond_dev);
3240 struct slave *slave = NULL;
3243 case NETDEV_UNREGISTER:
3245 if (bond->setup_by_slave)
3246 bond_release_and_destroy(bond_dev, slave_dev);
3248 bond_release(bond_dev, slave_dev);
3253 slave = bond_get_slave_by_dev(bond, slave_dev);
3255 u32 old_speed = slave->speed;
3256 u8 old_duplex = slave->duplex;
3258 bond_update_speed_duplex(slave);
3260 if (bond->params.mode == BOND_MODE_8023AD) {
3261 if (old_speed != slave->speed)
3262 bond_3ad_adapter_speed_changed(slave);
3263 if (old_duplex != slave->duplex)
3264 bond_3ad_adapter_duplex_changed(slave);
3271 * ... Or is it this?
3274 case NETDEV_CHANGEMTU:
3276 * TODO: Should slaves be allowed to
3277 * independently alter their MTU? For
3278 * an active-backup bond, slaves need
3279 * not be the same type of device, so
3280 * MTUs may vary. For other modes,
3281 * slaves arguably should have the
3282 * same MTUs. To do this, we'd need to
3283 * take over the slave's change_mtu
3284 * function for the duration of their
3288 case NETDEV_CHANGENAME:
3290 * TODO: handle changing the primary's name
3293 case NETDEV_FEAT_CHANGE:
3294 bond_compute_features(bond);
3304 * bond_netdev_event: handle netdev notifier chain events.
3306 * This function receives events for the netdev chain. The caller (an
3307 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3308 * locks for us to safely manipulate the slave devices (RTNL lock,
3311 static int bond_netdev_event(struct notifier_block *this,
3312 unsigned long event, void *ptr)
3314 struct net_device *event_dev = (struct net_device *)ptr;
3316 pr_debug("event_dev: %s, event: %lx\n",
3317 event_dev ? event_dev->name : "None",
3320 if (!(event_dev->priv_flags & IFF_BONDING))
3323 if (event_dev->flags & IFF_MASTER) {
3324 pr_debug("IFF_MASTER\n");
3325 return bond_master_netdev_event(event, event_dev);
3328 if (event_dev->flags & IFF_SLAVE) {
3329 pr_debug("IFF_SLAVE\n");
3330 return bond_slave_netdev_event(event, event_dev);
3337 * bond_inetaddr_event: handle inetaddr notifier chain events.
3339 * We keep track of device IPs primarily to use as source addresses in
3340 * ARP monitor probes (rather than spewing out broadcasts all the time).
3342 * We track one IP for the main device (if it has one), plus one per VLAN.
3344 static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
3346 struct in_ifaddr *ifa = ptr;
3347 struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev;
3348 struct bond_net *bn = net_generic(dev_net(event_dev), bond_net_id);
3349 struct bonding *bond;
3350 struct vlan_entry *vlan;
3352 /* we only care about primary address */
3353 if(ifa->ifa_flags & IFA_F_SECONDARY)
3356 list_for_each_entry(bond, &bn->dev_list, bond_list) {
3357 if (bond->dev == event_dev) {
3360 bond->master_ip = ifa->ifa_local;
3363 bond->master_ip = 0;
3370 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
3371 vlan_dev = __vlan_find_dev_deep(bond->dev,
3373 if (vlan_dev == event_dev) {
3376 vlan->vlan_ip = ifa->ifa_local;
3390 static struct notifier_block bond_netdev_notifier = {
3391 .notifier_call = bond_netdev_event,
3394 static struct notifier_block bond_inetaddr_notifier = {
3395 .notifier_call = bond_inetaddr_event,
3398 /*---------------------------- Hashing Policies -----------------------------*/
3401 * Hash for the output device based upon layer 2 and layer 3 data. If
3402 * the packet is not IP mimic bond_xmit_hash_policy_l2()
3404 static int bond_xmit_hash_policy_l23(struct sk_buff *skb, int count)
3406 struct ethhdr *data = (struct ethhdr *)skb->data;
3407 struct iphdr *iph = ip_hdr(skb);
3409 if (skb->protocol == htons(ETH_P_IP)) {
3410 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^
3411 (data->h_dest[5] ^ data->h_source[5])) % count;
3414 return (data->h_dest[5] ^ data->h_source[5]) % count;
3418 * Hash for the output device based upon layer 3 and layer 4 data. If
3419 * the packet is a frag or not TCP or UDP, just use layer 3 data. If it is
3420 * altogether not IP, mimic bond_xmit_hash_policy_l2()
3422 static int bond_xmit_hash_policy_l34(struct sk_buff *skb, int count)
3424 struct ethhdr *data = (struct ethhdr *)skb->data;
3425 struct iphdr *iph = ip_hdr(skb);
3426 __be16 *layer4hdr = (__be16 *)((u32 *)iph + iph->ihl);
3429 if (skb->protocol == htons(ETH_P_IP)) {
3430 if (!ip_is_fragment(iph) &&
3431 (iph->protocol == IPPROTO_TCP ||
3432 iph->protocol == IPPROTO_UDP)) {
3433 layer4_xor = ntohs((*layer4hdr ^ *(layer4hdr + 1)));
3435 return (layer4_xor ^
3436 ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3440 return (data->h_dest[5] ^ data->h_source[5]) % count;
3444 * Hash for the output device based upon layer 2 data
3446 static int bond_xmit_hash_policy_l2(struct sk_buff *skb, int count)
3448 struct ethhdr *data = (struct ethhdr *)skb->data;
3450 return (data->h_dest[5] ^ data->h_source[5]) % count;
3453 /*-------------------------- Device entry points ----------------------------*/
3455 static void bond_work_init_all(struct bonding *bond)
3457 INIT_DELAYED_WORK(&bond->mcast_work,
3458 bond_resend_igmp_join_requests_delayed);
3459 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3460 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3461 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3462 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon);
3464 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon);
3465 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3468 static void bond_work_cancel_all(struct bonding *bond)
3470 cancel_delayed_work_sync(&bond->mii_work);
3471 cancel_delayed_work_sync(&bond->arp_work);
3472 cancel_delayed_work_sync(&bond->alb_work);
3473 cancel_delayed_work_sync(&bond->ad_work);
3474 cancel_delayed_work_sync(&bond->mcast_work);
3477 static int bond_open(struct net_device *bond_dev)
3479 struct bonding *bond = netdev_priv(bond_dev);
3480 struct slave *slave;
3483 /* reset slave->backup and slave->inactive */
3484 read_lock(&bond->lock);
3485 if (bond->slave_cnt > 0) {
3486 read_lock(&bond->curr_slave_lock);
3487 bond_for_each_slave(bond, slave, i) {
3488 if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3489 && (slave != bond->curr_active_slave)) {
3490 bond_set_slave_inactive_flags(slave);
3492 bond_set_slave_active_flags(slave);
3495 read_unlock(&bond->curr_slave_lock);
3497 read_unlock(&bond->lock);
3499 bond_work_init_all(bond);
3501 if (bond_is_lb(bond)) {
3502 /* bond_alb_initialize must be called before the timer
3505 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB)))
3507 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3510 if (bond->params.miimon) /* link check interval, in milliseconds. */
3511 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3513 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3514 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3515 if (bond->params.arp_validate)
3516 bond->recv_probe = bond_arp_rcv;
3519 if (bond->params.mode == BOND_MODE_8023AD) {
3520 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3521 /* register to receive LACPDUs */
3522 bond->recv_probe = bond_3ad_lacpdu_recv;
3523 bond_3ad_initiate_agg_selection(bond, 1);
3529 static int bond_close(struct net_device *bond_dev)
3531 struct bonding *bond = netdev_priv(bond_dev);
3533 write_lock_bh(&bond->lock);
3534 bond->send_peer_notif = 0;
3535 write_unlock_bh(&bond->lock);
3537 bond_work_cancel_all(bond);
3538 if (bond_is_lb(bond)) {
3539 /* Must be called only after all
3540 * slaves have been released
3542 bond_alb_deinitialize(bond);
3544 bond->recv_probe = NULL;
3549 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3550 struct rtnl_link_stats64 *stats)
3552 struct bonding *bond = netdev_priv(bond_dev);
3553 struct rtnl_link_stats64 temp;
3554 struct slave *slave;
3557 memset(stats, 0, sizeof(*stats));
3559 read_lock_bh(&bond->lock);
3561 bond_for_each_slave(bond, slave, i) {
3562 const struct rtnl_link_stats64 *sstats =
3563 dev_get_stats(slave->dev, &temp);
3565 stats->rx_packets += sstats->rx_packets;
3566 stats->rx_bytes += sstats->rx_bytes;
3567 stats->rx_errors += sstats->rx_errors;
3568 stats->rx_dropped += sstats->rx_dropped;
3570 stats->tx_packets += sstats->tx_packets;
3571 stats->tx_bytes += sstats->tx_bytes;
3572 stats->tx_errors += sstats->tx_errors;
3573 stats->tx_dropped += sstats->tx_dropped;
3575 stats->multicast += sstats->multicast;
3576 stats->collisions += sstats->collisions;
3578 stats->rx_length_errors += sstats->rx_length_errors;
3579 stats->rx_over_errors += sstats->rx_over_errors;
3580 stats->rx_crc_errors += sstats->rx_crc_errors;
3581 stats->rx_frame_errors += sstats->rx_frame_errors;
3582 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3583 stats->rx_missed_errors += sstats->rx_missed_errors;
3585 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3586 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3587 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3588 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3589 stats->tx_window_errors += sstats->tx_window_errors;
3592 read_unlock_bh(&bond->lock);
3597 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3599 struct net_device *slave_dev = NULL;
3600 struct ifbond k_binfo;
3601 struct ifbond __user *u_binfo = NULL;
3602 struct ifslave k_sinfo;
3603 struct ifslave __user *u_sinfo = NULL;
3604 struct mii_ioctl_data *mii = NULL;
3607 pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd);
3619 * We do this again just in case we were called by SIOCGMIIREG
3620 * instead of SIOCGMIIPHY.
3627 if (mii->reg_num == 1) {
3628 struct bonding *bond = netdev_priv(bond_dev);
3630 read_lock(&bond->lock);
3631 read_lock(&bond->curr_slave_lock);
3632 if (netif_carrier_ok(bond->dev))
3633 mii->val_out = BMSR_LSTATUS;
3635 read_unlock(&bond->curr_slave_lock);
3636 read_unlock(&bond->lock);
3640 case BOND_INFO_QUERY_OLD:
3641 case SIOCBONDINFOQUERY:
3642 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3644 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3647 res = bond_info_query(bond_dev, &k_binfo);
3649 copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3653 case BOND_SLAVE_INFO_QUERY_OLD:
3654 case SIOCBONDSLAVEINFOQUERY:
3655 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3657 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3660 res = bond_slave_info_query(bond_dev, &k_sinfo);
3662 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3671 if (!capable(CAP_NET_ADMIN))
3674 slave_dev = dev_get_by_name(dev_net(bond_dev), ifr->ifr_slave);
3676 pr_debug("slave_dev=%p:\n", slave_dev);
3681 pr_debug("slave_dev->name=%s:\n", slave_dev->name);
3683 case BOND_ENSLAVE_OLD:
3684 case SIOCBONDENSLAVE:
3685 res = bond_enslave(bond_dev, slave_dev);
3687 case BOND_RELEASE_OLD:
3688 case SIOCBONDRELEASE:
3689 res = bond_release(bond_dev, slave_dev);
3691 case BOND_SETHWADDR_OLD:
3692 case SIOCBONDSETHWADDR:
3693 res = bond_sethwaddr(bond_dev, slave_dev);
3695 case BOND_CHANGE_ACTIVE_OLD:
3696 case SIOCBONDCHANGEACTIVE:
3697 res = bond_ioctl_change_active(bond_dev, slave_dev);
3709 static bool bond_addr_in_mc_list(unsigned char *addr,
3710 struct netdev_hw_addr_list *list,
3713 struct netdev_hw_addr *ha;
3715 netdev_hw_addr_list_for_each(ha, list)
3716 if (!memcmp(ha->addr, addr, addrlen))
3722 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3724 struct bonding *bond = netdev_priv(bond_dev);
3726 if (change & IFF_PROMISC)
3727 bond_set_promiscuity(bond,
3728 bond_dev->flags & IFF_PROMISC ? 1 : -1);
3730 if (change & IFF_ALLMULTI)
3731 bond_set_allmulti(bond,
3732 bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3735 static void bond_set_multicast_list(struct net_device *bond_dev)
3737 struct bonding *bond = netdev_priv(bond_dev);
3738 struct netdev_hw_addr *ha;
3741 read_lock(&bond->lock);
3743 /* looking for addresses to add to slaves' mc list */
3744 netdev_for_each_mc_addr(ha, bond_dev) {
3745 found = bond_addr_in_mc_list(ha->addr, &bond->mc_list,
3746 bond_dev->addr_len);
3748 bond_mc_add(bond, ha->addr);
3751 /* looking for addresses to delete from slaves' list */
3752 netdev_hw_addr_list_for_each(ha, &bond->mc_list) {
3753 found = bond_addr_in_mc_list(ha->addr, &bond_dev->mc,
3754 bond_dev->addr_len);
3756 bond_mc_del(bond, ha->addr);
3759 /* save master's multicast list */
3760 __hw_addr_flush(&bond->mc_list);
3761 __hw_addr_add_multiple(&bond->mc_list, &bond_dev->mc,
3762 bond_dev->addr_len, NETDEV_HW_ADDR_T_MULTICAST);
3764 read_unlock(&bond->lock);
3767 static int bond_neigh_setup(struct net_device *dev, struct neigh_parms *parms)
3769 struct bonding *bond = netdev_priv(dev);
3770 struct slave *slave = bond->first_slave;
3773 const struct net_device_ops *slave_ops
3774 = slave->dev->netdev_ops;
3775 if (slave_ops->ndo_neigh_setup)
3776 return slave_ops->ndo_neigh_setup(slave->dev, parms);
3782 * Change the MTU of all of a master's slaves to match the master
3784 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3786 struct bonding *bond = netdev_priv(bond_dev);
3787 struct slave *slave, *stop_at;
3791 pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond,
3792 (bond_dev ? bond_dev->name : "None"), new_mtu);
3794 /* Can't hold bond->lock with bh disabled here since
3795 * some base drivers panic. On the other hand we can't
3796 * hold bond->lock without bh disabled because we'll
3797 * deadlock. The only solution is to rely on the fact
3798 * that we're under rtnl_lock here, and the slaves
3799 * list won't change. This doesn't solve the problem
3800 * of setting the slave's MTU while it is
3801 * transmitting, but the assumption is that the base
3802 * driver can handle that.
3804 * TODO: figure out a way to safely iterate the slaves
3805 * list, but without holding a lock around the actual
3806 * call to the base driver.
3809 bond_for_each_slave(bond, slave, i) {
3810 pr_debug("s %p s->p %p c_m %p\n",
3813 slave->dev->netdev_ops->ndo_change_mtu);
3815 res = dev_set_mtu(slave->dev, new_mtu);
3818 /* If we failed to set the slave's mtu to the new value
3819 * we must abort the operation even in ACTIVE_BACKUP
3820 * mode, because if we allow the backup slaves to have
3821 * different mtu values than the active slave we'll
3822 * need to change their mtu when doing a failover. That
3823 * means changing their mtu from timer context, which
3824 * is probably not a good idea.
3826 pr_debug("err %d %s\n", res, slave->dev->name);
3831 bond_dev->mtu = new_mtu;
3836 /* unwind from head to the slave that failed */
3838 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3841 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
3843 pr_debug("unwind err %d dev %s\n",
3844 tmp_res, slave->dev->name);
3854 * Note that many devices must be down to change the HW address, and
3855 * downing the master releases all slaves. We can make bonds full of
3856 * bonding devices to test this, however.
3858 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3860 struct bonding *bond = netdev_priv(bond_dev);
3861 struct sockaddr *sa = addr, tmp_sa;
3862 struct slave *slave, *stop_at;
3866 if (bond->params.mode == BOND_MODE_ALB)
3867 return bond_alb_set_mac_address(bond_dev, addr);
3870 pr_debug("bond=%p, name=%s\n",
3871 bond, bond_dev ? bond_dev->name : "None");
3874 * If fail_over_mac is set to active, do nothing and return
3875 * success. Returning an error causes ifenslave to fail.
3877 if (bond->params.fail_over_mac == BOND_FOM_ACTIVE)
3880 if (!is_valid_ether_addr(sa->sa_data))
3881 return -EADDRNOTAVAIL;
3883 /* Can't hold bond->lock with bh disabled here since
3884 * some base drivers panic. On the other hand we can't
3885 * hold bond->lock without bh disabled because we'll
3886 * deadlock. The only solution is to rely on the fact
3887 * that we're under rtnl_lock here, and the slaves
3888 * list won't change. This doesn't solve the problem
3889 * of setting the slave's hw address while it is
3890 * transmitting, but the assumption is that the base
3891 * driver can handle that.
3893 * TODO: figure out a way to safely iterate the slaves
3894 * list, but without holding a lock around the actual
3895 * call to the base driver.
3898 bond_for_each_slave(bond, slave, i) {
3899 const struct net_device_ops *slave_ops = slave->dev->netdev_ops;
3900 pr_debug("slave %p %s\n", slave, slave->dev->name);
3902 if (slave_ops->ndo_set_mac_address == NULL) {
3904 pr_debug("EOPNOTSUPP %s\n", slave->dev->name);
3908 res = dev_set_mac_address(slave->dev, addr);
3910 /* TODO: consider downing the slave
3912 * User should expect communications
3913 * breakage anyway until ARP finish
3916 pr_debug("err %d %s\n", res, slave->dev->name);
3922 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3926 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3927 tmp_sa.sa_family = bond_dev->type;
3929 /* unwind from head to the slave that failed */
3931 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3934 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
3936 pr_debug("unwind err %d dev %s\n",
3937 tmp_res, slave->dev->name);
3944 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3946 struct bonding *bond = netdev_priv(bond_dev);
3947 struct slave *slave, *start_at;
3948 int i, slave_no, res = 1;
3949 struct iphdr *iph = ip_hdr(skb);
3952 * Start with the curr_active_slave that joined the bond as the
3953 * default for sending IGMP traffic. For failover purposes one
3954 * needs to maintain some consistency for the interface that will
3955 * send the join/membership reports. The curr_active_slave found
3956 * will send all of this type of traffic.
3958 if ((iph->protocol == IPPROTO_IGMP) &&
3959 (skb->protocol == htons(ETH_P_IP))) {
3961 read_lock(&bond->curr_slave_lock);
3962 slave = bond->curr_active_slave;
3963 read_unlock(&bond->curr_slave_lock);
3969 * Concurrent TX may collide on rr_tx_counter; we accept
3970 * that as being rare enough not to justify using an
3973 slave_no = bond->rr_tx_counter++ % bond->slave_cnt;
3975 bond_for_each_slave(bond, slave, i) {
3983 bond_for_each_slave_from(bond, slave, i, start_at) {
3984 if (IS_UP(slave->dev) &&
3985 (slave->link == BOND_LINK_UP) &&
3986 bond_is_active_slave(slave)) {
3987 res = bond_dev_queue_xmit(bond, skb, slave->dev);
3994 /* no suitable interface, frame not sent */
3998 return NETDEV_TX_OK;
4003 * in active-backup mode, we know that bond->curr_active_slave is always valid if
4004 * the bond has a usable interface.
4006 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
4008 struct bonding *bond = netdev_priv(bond_dev);
4011 read_lock(&bond->curr_slave_lock);
4013 if (bond->curr_active_slave)
4014 res = bond_dev_queue_xmit(bond, skb,
4015 bond->curr_active_slave->dev);
4018 /* no suitable interface, frame not sent */
4021 read_unlock(&bond->curr_slave_lock);
4023 return NETDEV_TX_OK;
4027 * In bond_xmit_xor() , we determine the output device by using a pre-
4028 * determined xmit_hash_policy(), If the selected device is not enabled,
4029 * find the next active slave.
4031 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
4033 struct bonding *bond = netdev_priv(bond_dev);
4034 struct slave *slave, *start_at;
4039 slave_no = bond->xmit_hash_policy(skb, bond->slave_cnt);
4041 bond_for_each_slave(bond, slave, i) {
4049 bond_for_each_slave_from(bond, slave, i, start_at) {
4050 if (IS_UP(slave->dev) &&
4051 (slave->link == BOND_LINK_UP) &&
4052 bond_is_active_slave(slave)) {
4053 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4059 /* no suitable interface, frame not sent */
4063 return NETDEV_TX_OK;
4067 * in broadcast mode, we send everything to all usable interfaces.
4069 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4071 struct bonding *bond = netdev_priv(bond_dev);
4072 struct slave *slave, *start_at;
4073 struct net_device *tx_dev = NULL;
4077 read_lock(&bond->curr_slave_lock);
4078 start_at = bond->curr_active_slave;
4079 read_unlock(&bond->curr_slave_lock);
4084 bond_for_each_slave_from(bond, slave, i, start_at) {
4085 if (IS_UP(slave->dev) &&
4086 (slave->link == BOND_LINK_UP) &&
4087 bond_is_active_slave(slave)) {
4089 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4091 pr_err("%s: Error: bond_xmit_broadcast(): skb_clone() failed\n",
4096 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4098 dev_kfree_skb(skb2);
4102 tx_dev = slave->dev;
4107 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4111 /* no suitable interface, frame not sent */
4114 /* frame sent to all suitable interfaces */
4115 return NETDEV_TX_OK;
4118 /*------------------------- Device initialization ---------------------------*/
4120 static void bond_set_xmit_hash_policy(struct bonding *bond)
4122 switch (bond->params.xmit_policy) {
4123 case BOND_XMIT_POLICY_LAYER23:
4124 bond->xmit_hash_policy = bond_xmit_hash_policy_l23;
4126 case BOND_XMIT_POLICY_LAYER34:
4127 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4129 case BOND_XMIT_POLICY_LAYER2:
4131 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4137 * Lookup the slave that corresponds to a qid
4139 static inline int bond_slave_override(struct bonding *bond,
4140 struct sk_buff *skb)
4143 struct slave *slave = NULL;
4144 struct slave *check_slave;
4146 if (!skb->queue_mapping)
4149 /* Find out if any slaves have the same mapping as this skb. */
4150 bond_for_each_slave(bond, check_slave, i) {
4151 if (check_slave->queue_id == skb->queue_mapping) {
4152 slave = check_slave;
4157 /* If the slave isn't UP, use default transmit policy. */
4158 if (slave && slave->queue_id && IS_UP(slave->dev) &&
4159 (slave->link == BOND_LINK_UP)) {
4160 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4167 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb)
4170 * This helper function exists to help dev_pick_tx get the correct
4171 * destination queue. Using a helper function skips a call to
4172 * skb_tx_hash and will put the skbs in the queue we expect on their
4173 * way down to the bonding driver.
4175 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
4178 * Save the original txq to restore before passing to the driver
4180 qdisc_skb_cb(skb)->bond_queue_mapping = skb->queue_mapping;
4182 if (unlikely(txq >= dev->real_num_tx_queues)) {
4184 txq -= dev->real_num_tx_queues;
4185 } while (txq >= dev->real_num_tx_queues);
4190 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4192 struct bonding *bond = netdev_priv(dev);
4194 if (TX_QUEUE_OVERRIDE(bond->params.mode)) {
4195 if (!bond_slave_override(bond, skb))
4196 return NETDEV_TX_OK;
4199 switch (bond->params.mode) {
4200 case BOND_MODE_ROUNDROBIN:
4201 return bond_xmit_roundrobin(skb, dev);
4202 case BOND_MODE_ACTIVEBACKUP:
4203 return bond_xmit_activebackup(skb, dev);
4205 return bond_xmit_xor(skb, dev);
4206 case BOND_MODE_BROADCAST:
4207 return bond_xmit_broadcast(skb, dev);
4208 case BOND_MODE_8023AD:
4209 return bond_3ad_xmit_xor(skb, dev);
4212 return bond_alb_xmit(skb, dev);
4214 /* Should never happen, mode already checked */
4215 pr_err("%s: Error: Unknown bonding mode %d\n",
4216 dev->name, bond->params.mode);
4219 return NETDEV_TX_OK;
4223 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4225 struct bonding *bond = netdev_priv(dev);
4226 netdev_tx_t ret = NETDEV_TX_OK;
4229 * If we risk deadlock from transmitting this in the
4230 * netpoll path, tell netpoll to queue the frame for later tx
4232 if (is_netpoll_tx_blocked(dev))
4233 return NETDEV_TX_BUSY;
4235 read_lock(&bond->lock);
4237 if (bond->slave_cnt)
4238 ret = __bond_start_xmit(skb, dev);
4242 read_unlock(&bond->lock);
4248 * set bond mode specific net device operations
4250 void bond_set_mode_ops(struct bonding *bond, int mode)
4252 struct net_device *bond_dev = bond->dev;
4255 case BOND_MODE_ROUNDROBIN:
4257 case BOND_MODE_ACTIVEBACKUP:
4260 bond_set_xmit_hash_policy(bond);
4262 case BOND_MODE_BROADCAST:
4264 case BOND_MODE_8023AD:
4265 bond_set_xmit_hash_policy(bond);
4272 /* Should never happen, mode already checked */
4273 pr_err("%s: Error: Unknown bonding mode %d\n",
4274 bond_dev->name, mode);
4279 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4280 struct ethtool_drvinfo *drvinfo)
4282 strncpy(drvinfo->driver, DRV_NAME, 32);
4283 strncpy(drvinfo->version, DRV_VERSION, 32);
4284 snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
4287 static const struct ethtool_ops bond_ethtool_ops = {
4288 .get_drvinfo = bond_ethtool_get_drvinfo,
4289 .get_link = ethtool_op_get_link,
4292 static const struct net_device_ops bond_netdev_ops = {
4293 .ndo_init = bond_init,
4294 .ndo_uninit = bond_uninit,
4295 .ndo_open = bond_open,
4296 .ndo_stop = bond_close,
4297 .ndo_start_xmit = bond_start_xmit,
4298 .ndo_select_queue = bond_select_queue,
4299 .ndo_get_stats64 = bond_get_stats,
4300 .ndo_do_ioctl = bond_do_ioctl,
4301 .ndo_change_rx_flags = bond_change_rx_flags,
4302 .ndo_set_rx_mode = bond_set_multicast_list,
4303 .ndo_change_mtu = bond_change_mtu,
4304 .ndo_set_mac_address = bond_set_mac_address,
4305 .ndo_neigh_setup = bond_neigh_setup,
4306 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid,
4307 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid,
4308 #ifdef CONFIG_NET_POLL_CONTROLLER
4309 .ndo_netpoll_setup = bond_netpoll_setup,
4310 .ndo_netpoll_cleanup = bond_netpoll_cleanup,
4311 .ndo_poll_controller = bond_poll_controller,
4313 .ndo_add_slave = bond_enslave,
4314 .ndo_del_slave = bond_release,
4315 .ndo_fix_features = bond_fix_features,
4318 static void bond_destructor(struct net_device *bond_dev)
4320 struct bonding *bond = netdev_priv(bond_dev);
4322 destroy_workqueue(bond->wq);
4323 free_netdev(bond_dev);
4326 static void bond_setup(struct net_device *bond_dev)
4328 struct bonding *bond = netdev_priv(bond_dev);
4330 /* initialize rwlocks */
4331 rwlock_init(&bond->lock);
4332 rwlock_init(&bond->curr_slave_lock);
4334 bond->params = bonding_defaults;
4336 /* Initialize pointers */
4337 bond->dev = bond_dev;
4338 INIT_LIST_HEAD(&bond->vlan_list);
4340 /* Initialize the device entry points */
4341 ether_setup(bond_dev);
4342 bond_dev->netdev_ops = &bond_netdev_ops;
4343 bond_dev->ethtool_ops = &bond_ethtool_ops;
4344 bond_set_mode_ops(bond, bond->params.mode);
4346 bond_dev->destructor = bond_destructor;
4348 /* Initialize the device options */
4349 bond_dev->tx_queue_len = 0;
4350 bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4351 bond_dev->priv_flags |= IFF_BONDING;
4352 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4354 /* At first, we block adding VLANs. That's the only way to
4355 * prevent problems that occur when adding VLANs over an
4356 * empty bond. The block will be removed once non-challenged
4357 * slaves are enslaved.
4359 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4361 /* don't acquire bond device's netif_tx_lock when
4363 bond_dev->features |= NETIF_F_LLTX;
4365 /* By default, we declare the bond to be fully
4366 * VLAN hardware accelerated capable. Special
4367 * care is taken in the various xmit functions
4368 * when there are slaves that are not hw accel
4372 bond_dev->hw_features = BOND_VLAN_FEATURES |
4373 NETIF_F_HW_VLAN_TX |
4374 NETIF_F_HW_VLAN_RX |
4375 NETIF_F_HW_VLAN_FILTER;
4377 bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_NO_CSUM);
4378 bond_dev->features |= bond_dev->hw_features;
4382 * Destroy a bonding device.
4383 * Must be under rtnl_lock when this function is called.
4385 static void bond_uninit(struct net_device *bond_dev)
4387 struct bonding *bond = netdev_priv(bond_dev);
4388 struct vlan_entry *vlan, *tmp;
4390 bond_netpoll_cleanup(bond_dev);
4392 /* Release the bonded slaves */
4393 bond_release_all(bond_dev);
4395 list_del(&bond->bond_list);
4397 bond_work_cancel_all(bond);
4399 bond_debug_unregister(bond);
4401 __hw_addr_flush(&bond->mc_list);
4403 list_for_each_entry_safe(vlan, tmp, &bond->vlan_list, vlan_list) {
4404 list_del(&vlan->vlan_list);
4409 /*------------------------- Module initialization ---------------------------*/
4412 * Convert string input module parms. Accept either the
4413 * number of the mode or its string name. A bit complicated because
4414 * some mode names are substrings of other names, and calls from sysfs
4415 * may have whitespace in the name (trailing newlines, for example).
4417 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl)
4419 int modeint = -1, i, rv;
4420 char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, };
4422 for (p = (char *)buf; *p; p++)
4423 if (!(isdigit(*p) || isspace(*p)))
4427 rv = sscanf(buf, "%20s", modestr);
4429 rv = sscanf(buf, "%d", &modeint);
4434 for (i = 0; tbl[i].modename; i++) {
4435 if (modeint == tbl[i].mode)
4437 if (strcmp(modestr, tbl[i].modename) == 0)
4444 static int bond_check_params(struct bond_params *params)
4446 int arp_validate_value, fail_over_mac_value, primary_reselect_value;
4449 * Convert string parameters.
4452 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4453 if (bond_mode == -1) {
4454 pr_err("Error: Invalid bonding mode \"%s\"\n",
4455 mode == NULL ? "NULL" : mode);
4460 if (xmit_hash_policy) {
4461 if ((bond_mode != BOND_MODE_XOR) &&
4462 (bond_mode != BOND_MODE_8023AD)) {
4463 pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4464 bond_mode_name(bond_mode));
4466 xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4468 if (xmit_hashtype == -1) {
4469 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4470 xmit_hash_policy == NULL ? "NULL" :
4478 if (bond_mode != BOND_MODE_8023AD) {
4479 pr_info("lacp_rate param is irrelevant in mode %s\n",
4480 bond_mode_name(bond_mode));
4482 lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4483 if (lacp_fast == -1) {
4484 pr_err("Error: Invalid lacp rate \"%s\"\n",
4485 lacp_rate == NULL ? "NULL" : lacp_rate);
4492 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl);
4493 if (params->ad_select == -1) {
4494 pr_err("Error: Invalid ad_select \"%s\"\n",
4495 ad_select == NULL ? "NULL" : ad_select);
4499 if (bond_mode != BOND_MODE_8023AD) {
4500 pr_warning("ad_select param only affects 802.3ad mode\n");
4503 params->ad_select = BOND_AD_STABLE;
4506 if (max_bonds < 0) {
4507 pr_warning("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4508 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4509 max_bonds = BOND_DEFAULT_MAX_BONDS;
4513 pr_warning("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to %d\n",
4514 miimon, INT_MAX, BOND_LINK_MON_INTERV);
4515 miimon = BOND_LINK_MON_INTERV;
4519 pr_warning("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4524 if (downdelay < 0) {
4525 pr_warning("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4526 downdelay, INT_MAX);
4530 if ((use_carrier != 0) && (use_carrier != 1)) {
4531 pr_warning("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4536 if (num_peer_notif < 0 || num_peer_notif > 255) {
4537 pr_warning("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4542 /* reset values for 802.3ad */
4543 if (bond_mode == BOND_MODE_8023AD) {
4545 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");
4546 pr_warning("Forcing miimon to 100msec\n");
4551 if (tx_queues < 1 || tx_queues > 255) {
4552 pr_warning("Warning: tx_queues (%d) should be between "
4553 "1 and 255, resetting to %d\n",
4554 tx_queues, BOND_DEFAULT_TX_QUEUES);
4555 tx_queues = BOND_DEFAULT_TX_QUEUES;
4558 if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4559 pr_warning("Warning: all_slaves_active module parameter (%d), "
4560 "not of valid value (0/1), so it was set to "
4561 "0\n", all_slaves_active);
4562 all_slaves_active = 0;
4565 if (resend_igmp < 0 || resend_igmp > 255) {
4566 pr_warning("Warning: resend_igmp (%d) should be between "
4567 "0 and 255, resetting to %d\n",
4568 resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4569 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4572 /* reset values for TLB/ALB */
4573 if ((bond_mode == BOND_MODE_TLB) ||
4574 (bond_mode == BOND_MODE_ALB)) {
4576 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");
4577 pr_warning("Forcing miimon to 100msec\n");
4582 if (bond_mode == BOND_MODE_ALB) {
4583 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",
4588 if (updelay || downdelay) {
4589 /* just warn the user the up/down delay will have
4590 * no effect since miimon is zero...
4592 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",
4593 updelay, downdelay);
4596 /* don't allow arp monitoring */
4598 pr_warning("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4599 miimon, arp_interval);
4603 if ((updelay % miimon) != 0) {
4604 pr_warning("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4606 (updelay / miimon) * miimon);
4611 if ((downdelay % miimon) != 0) {
4612 pr_warning("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4614 (downdelay / miimon) * miimon);
4617 downdelay /= miimon;
4620 if (arp_interval < 0) {
4621 pr_warning("Warning: arp_interval module parameter (%d) , not in range 0-%d, so it was reset to %d\n",
4622 arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4623 arp_interval = BOND_LINK_ARP_INTERV;
4626 for (arp_ip_count = 0;
4627 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
4629 /* not complete check, but should be good enough to
4631 if (!isdigit(arp_ip_target[arp_ip_count][0])) {
4632 pr_warning("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4633 arp_ip_target[arp_ip_count]);
4636 __be32 ip = in_aton(arp_ip_target[arp_ip_count]);
4637 arp_target[arp_ip_count] = ip;
4641 if (arp_interval && !arp_ip_count) {
4642 /* don't allow arping if no arp_ip_target given... */
4643 pr_warning("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4649 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4650 pr_err("arp_validate only supported in active-backup mode\n");
4653 if (!arp_interval) {
4654 pr_err("arp_validate requires arp_interval\n");
4658 arp_validate_value = bond_parse_parm(arp_validate,
4660 if (arp_validate_value == -1) {
4661 pr_err("Error: invalid arp_validate \"%s\"\n",
4662 arp_validate == NULL ? "NULL" : arp_validate);
4666 arp_validate_value = 0;
4669 pr_info("MII link monitoring set to %d ms\n", miimon);
4670 } else if (arp_interval) {
4673 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4675 arp_validate_tbl[arp_validate_value].modename,
4678 for (i = 0; i < arp_ip_count; i++)
4679 pr_info(" %s", arp_ip_target[i]);
4683 } else if (max_bonds) {
4684 /* miimon and arp_interval not set, we need one so things
4685 * work as expected, see bonding.txt for details
4687 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");
4690 if (primary && !USES_PRIMARY(bond_mode)) {
4691 /* currently, using a primary only makes sense
4692 * in active backup, TLB or ALB modes
4694 pr_warning("Warning: %s primary device specified but has no effect in %s mode\n",
4695 primary, bond_mode_name(bond_mode));
4699 if (primary && primary_reselect) {
4700 primary_reselect_value = bond_parse_parm(primary_reselect,
4702 if (primary_reselect_value == -1) {
4703 pr_err("Error: Invalid primary_reselect \"%s\"\n",
4705 NULL ? "NULL" : primary_reselect);
4709 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4712 if (fail_over_mac) {
4713 fail_over_mac_value = bond_parse_parm(fail_over_mac,
4715 if (fail_over_mac_value == -1) {
4716 pr_err("Error: invalid fail_over_mac \"%s\"\n",
4717 arp_validate == NULL ? "NULL" : arp_validate);
4721 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4722 pr_warning("Warning: fail_over_mac only affects active-backup mode.\n");
4724 fail_over_mac_value = BOND_FOM_NONE;
4727 /* fill params struct with the proper values */
4728 params->mode = bond_mode;
4729 params->xmit_policy = xmit_hashtype;
4730 params->miimon = miimon;
4731 params->num_peer_notif = num_peer_notif;
4732 params->arp_interval = arp_interval;
4733 params->arp_validate = arp_validate_value;
4734 params->updelay = updelay;
4735 params->downdelay = downdelay;
4736 params->use_carrier = use_carrier;
4737 params->lacp_fast = lacp_fast;
4738 params->primary[0] = 0;
4739 params->primary_reselect = primary_reselect_value;
4740 params->fail_over_mac = fail_over_mac_value;
4741 params->tx_queues = tx_queues;
4742 params->all_slaves_active = all_slaves_active;
4743 params->resend_igmp = resend_igmp;
4744 params->min_links = min_links;
4747 strncpy(params->primary, primary, IFNAMSIZ);
4748 params->primary[IFNAMSIZ - 1] = 0;
4751 memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4756 static struct lock_class_key bonding_netdev_xmit_lock_key;
4757 static struct lock_class_key bonding_netdev_addr_lock_key;
4759 static void bond_set_lockdep_class_one(struct net_device *dev,
4760 struct netdev_queue *txq,
4763 lockdep_set_class(&txq->_xmit_lock,
4764 &bonding_netdev_xmit_lock_key);
4767 static void bond_set_lockdep_class(struct net_device *dev)
4769 lockdep_set_class(&dev->addr_list_lock,
4770 &bonding_netdev_addr_lock_key);
4771 netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4775 * Called from registration process
4777 static int bond_init(struct net_device *bond_dev)
4779 struct bonding *bond = netdev_priv(bond_dev);
4780 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4781 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
4783 pr_debug("Begin bond_init for %s\n", bond_dev->name);
4786 * Initialize locks that may be required during
4787 * en/deslave operations. All of the bond_open work
4788 * (of which this is part) should really be moved to
4789 * a phase prior to dev_open
4791 spin_lock_init(&(bond_info->tx_hashtbl_lock));
4792 spin_lock_init(&(bond_info->rx_hashtbl_lock));
4794 bond->wq = create_singlethread_workqueue(bond_dev->name);
4798 bond_set_lockdep_class(bond_dev);
4800 list_add_tail(&bond->bond_list, &bn->dev_list);
4802 bond_prepare_sysfs_group(bond);
4804 bond_debug_register(bond);
4806 __hw_addr_init(&bond->mc_list);
4810 static int bond_validate(struct nlattr *tb[], struct nlattr *data[])
4812 if (tb[IFLA_ADDRESS]) {
4813 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
4815 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
4816 return -EADDRNOTAVAIL;
4821 static int bond_get_tx_queues(struct net *net, struct nlattr *tb[],
4822 unsigned int *num_queues,
4823 unsigned int *real_num_queues)
4825 *num_queues = tx_queues;
4829 static struct rtnl_link_ops bond_link_ops __read_mostly = {
4831 .priv_size = sizeof(struct bonding),
4832 .setup = bond_setup,
4833 .validate = bond_validate,
4834 .get_tx_queues = bond_get_tx_queues,
4837 /* Create a new bond based on the specified name and bonding parameters.
4838 * If name is NULL, obtain a suitable "bond%d" name for us.
4839 * Caller must NOT hold rtnl_lock; we need to release it here before we
4840 * set up our sysfs entries.
4842 int bond_create(struct net *net, const char *name)
4844 struct net_device *bond_dev;
4849 bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4850 name ? name : "bond%d",
4851 bond_setup, tx_queues);
4853 pr_err("%s: eek! can't alloc netdev!\n", name);
4858 dev_net_set(bond_dev, net);
4859 bond_dev->rtnl_link_ops = &bond_link_ops;
4861 res = register_netdevice(bond_dev);
4863 netif_carrier_off(bond_dev);
4867 bond_destructor(bond_dev);
4871 static int __net_init bond_net_init(struct net *net)
4873 struct bond_net *bn = net_generic(net, bond_net_id);
4876 INIT_LIST_HEAD(&bn->dev_list);
4878 bond_create_proc_dir(bn);
4879 bond_create_sysfs(bn);
4884 static void __net_exit bond_net_exit(struct net *net)
4886 struct bond_net *bn = net_generic(net, bond_net_id);
4887 struct bonding *bond, *tmp_bond;
4890 bond_destroy_sysfs(bn);
4891 bond_destroy_proc_dir(bn);
4893 /* Kill off any bonds created after unregistering bond rtnl ops */
4895 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4896 unregister_netdevice_queue(bond->dev, &list);
4897 unregister_netdevice_many(&list);
4901 static struct pernet_operations bond_net_ops = {
4902 .init = bond_net_init,
4903 .exit = bond_net_exit,
4905 .size = sizeof(struct bond_net),
4908 static int __init bonding_init(void)
4913 pr_info("%s", bond_version);
4915 res = bond_check_params(&bonding_defaults);
4919 res = register_pernet_subsys(&bond_net_ops);
4923 res = rtnl_link_register(&bond_link_ops);
4927 bond_create_debugfs();
4929 for (i = 0; i < max_bonds; i++) {
4930 res = bond_create(&init_net, NULL);
4935 register_netdevice_notifier(&bond_netdev_notifier);
4936 register_inetaddr_notifier(&bond_inetaddr_notifier);
4940 bond_destroy_debugfs();
4941 rtnl_link_unregister(&bond_link_ops);
4943 unregister_pernet_subsys(&bond_net_ops);
4948 static void __exit bonding_exit(void)
4950 unregister_netdevice_notifier(&bond_netdev_notifier);
4951 unregister_inetaddr_notifier(&bond_inetaddr_notifier);
4953 bond_destroy_debugfs();
4955 rtnl_link_unregister(&bond_link_ops);
4956 unregister_pernet_subsys(&bond_net_ops);
4958 #ifdef CONFIG_NET_POLL_CONTROLLER
4960 * Make sure we don't have an imbalance on our netpoll blocking
4962 WARN_ON(atomic_read(&netpoll_block_tx));
4966 module_init(bonding_init);
4967 module_exit(bonding_exit);
4968 MODULE_LICENSE("GPL");
4969 MODULE_VERSION(DRV_VERSION);
4970 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4971 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
4972 MODULE_ALIAS_RTNL_LINK("bond");