2 * originally based on the dummy device.
4 * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
5 * Licensed under the GPL. Based on dummy.c, and eql.c devices.
7 * bonding.c: an Ethernet Bonding driver
9 * This is useful to talk to a Cisco EtherChannel compatible equipment:
11 * Sun Trunking (Solaris)
12 * Alteon AceDirector Trunks
14 * and probably many L2 switches ...
17 * ifconfig bond0 ipaddress netmask up
18 * will setup a network device, with an ip address. No mac address
19 * will be assigned at this time. The hw mac address will come from
20 * the first slave bonded to the channel. All slaves will then use
21 * this hw mac address.
24 * will release all slaves, marking them as down.
26 * ifenslave bond0 eth0
27 * will attach eth0 to bond0 as a slave. eth0 hw mac address will either
28 * a: be used as initial mac address
29 * b: if a hw mac address already is there, eth0's hw mac address
30 * will then be set from bond0.
34 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
36 #include <linux/kernel.h>
37 #include <linux/module.h>
38 #include <linux/types.h>
39 #include <linux/fcntl.h>
40 #include <linux/interrupt.h>
41 #include <linux/ptrace.h>
42 #include <linux/ioport.h>
46 #include <linux/tcp.h>
47 #include <linux/udp.h>
48 #include <linux/slab.h>
49 #include <linux/string.h>
50 #include <linux/init.h>
51 #include <linux/timer.h>
52 #include <linux/socket.h>
53 #include <linux/ctype.h>
54 #include <linux/inet.h>
55 #include <linux/bitops.h>
58 #include <linux/uaccess.h>
59 #include <linux/errno.h>
60 #include <linux/netdevice.h>
61 #include <linux/inetdevice.h>
62 #include <linux/igmp.h>
63 #include <linux/etherdevice.h>
64 #include <linux/skbuff.h>
66 #include <linux/rtnetlink.h>
67 #include <linux/smp.h>
68 #include <linux/if_ether.h>
70 #include <linux/mii.h>
71 #include <linux/ethtool.h>
72 #include <linux/if_vlan.h>
73 #include <linux/if_bonding.h>
74 #include <linux/jiffies.h>
75 #include <linux/preempt.h>
76 #include <net/route.h>
77 #include <net/net_namespace.h>
78 #include <net/netns/generic.h>
79 #include <net/pkt_sched.h>
84 /*---------------------------- Module parameters ----------------------------*/
86 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
87 #define BOND_LINK_MON_INTERV 0
88 #define BOND_LINK_ARP_INTERV 0
90 static int max_bonds = BOND_DEFAULT_MAX_BONDS;
91 static int tx_queues = BOND_DEFAULT_TX_QUEUES;
92 static int num_peer_notif = 1;
93 static int miimon = BOND_LINK_MON_INTERV;
96 static int use_carrier = 1;
99 static char *primary_reselect;
100 static char *lacp_rate;
101 static int min_links;
102 static char *ad_select;
103 static char *xmit_hash_policy;
104 static int arp_interval = BOND_LINK_ARP_INTERV;
105 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
106 static char *arp_validate;
107 static char *fail_over_mac;
108 static int all_slaves_active = 0;
109 static struct bond_params bonding_defaults;
110 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
112 module_param(max_bonds, int, 0);
113 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
114 module_param(tx_queues, int, 0);
115 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
116 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
117 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
118 "failover event (alias of num_unsol_na)");
119 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
120 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
121 "failover event (alias of num_grat_arp)");
122 module_param(miimon, int, 0);
123 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
124 module_param(updelay, int, 0);
125 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
126 module_param(downdelay, int, 0);
127 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
129 module_param(use_carrier, int, 0);
130 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
131 "0 for off, 1 for on (default)");
132 module_param(mode, charp, 0);
133 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
134 "1 for active-backup, 2 for balance-xor, "
135 "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
136 "6 for balance-alb");
137 module_param(primary, charp, 0);
138 MODULE_PARM_DESC(primary, "Primary network device to use");
139 module_param(primary_reselect, charp, 0);
140 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
142 "0 for always (default), "
143 "1 for only if speed of primary is "
145 "2 for only on active slave "
147 module_param(lacp_rate, charp, 0);
148 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
149 "0 for slow, 1 for fast");
150 module_param(ad_select, charp, 0);
151 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic; "
152 "0 for stable (default), 1 for bandwidth, "
154 module_param(min_links, int, 0);
155 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
157 module_param(xmit_hash_policy, charp, 0);
158 MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; "
159 "0 for layer 2 (default), 1 for layer 3+4, "
161 module_param(arp_interval, int, 0);
162 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
163 module_param_array(arp_ip_target, charp, NULL, 0);
164 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
165 module_param(arp_validate, charp, 0);
166 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
167 "0 for none (default), 1 for active, "
168 "2 for backup, 3 for all");
169 module_param(fail_over_mac, charp, 0);
170 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
171 "the same MAC; 0 for none (default), "
172 "1 for active, 2 for follow");
173 module_param(all_slaves_active, int, 0);
174 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface"
175 "by setting active flag for all slaves; "
176 "0 for never (default), 1 for always.");
177 module_param(resend_igmp, int, 0);
178 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
181 /*----------------------------- Global variables ----------------------------*/
183 #ifdef CONFIG_NET_POLL_CONTROLLER
184 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
187 int bond_net_id __read_mostly;
189 static __be32 arp_target[BOND_MAX_ARP_TARGETS];
190 static int arp_ip_count;
191 static int bond_mode = BOND_MODE_ROUNDROBIN;
192 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
193 static int lacp_fast;
195 const struct bond_parm_tbl bond_lacp_tbl[] = {
196 { "slow", AD_LACP_SLOW},
197 { "fast", AD_LACP_FAST},
201 const struct bond_parm_tbl bond_mode_tbl[] = {
202 { "balance-rr", BOND_MODE_ROUNDROBIN},
203 { "active-backup", BOND_MODE_ACTIVEBACKUP},
204 { "balance-xor", BOND_MODE_XOR},
205 { "broadcast", BOND_MODE_BROADCAST},
206 { "802.3ad", BOND_MODE_8023AD},
207 { "balance-tlb", BOND_MODE_TLB},
208 { "balance-alb", BOND_MODE_ALB},
212 const struct bond_parm_tbl xmit_hashtype_tbl[] = {
213 { "layer2", BOND_XMIT_POLICY_LAYER2},
214 { "layer3+4", BOND_XMIT_POLICY_LAYER34},
215 { "layer2+3", BOND_XMIT_POLICY_LAYER23},
219 const struct bond_parm_tbl arp_validate_tbl[] = {
220 { "none", BOND_ARP_VALIDATE_NONE},
221 { "active", BOND_ARP_VALIDATE_ACTIVE},
222 { "backup", BOND_ARP_VALIDATE_BACKUP},
223 { "all", BOND_ARP_VALIDATE_ALL},
227 const struct bond_parm_tbl fail_over_mac_tbl[] = {
228 { "none", BOND_FOM_NONE},
229 { "active", BOND_FOM_ACTIVE},
230 { "follow", BOND_FOM_FOLLOW},
234 const struct bond_parm_tbl pri_reselect_tbl[] = {
235 { "always", BOND_PRI_RESELECT_ALWAYS},
236 { "better", BOND_PRI_RESELECT_BETTER},
237 { "failure", BOND_PRI_RESELECT_FAILURE},
241 struct bond_parm_tbl ad_select_tbl[] = {
242 { "stable", BOND_AD_STABLE},
243 { "bandwidth", BOND_AD_BANDWIDTH},
244 { "count", BOND_AD_COUNT},
248 /*-------------------------- Forward declarations ---------------------------*/
250 static int bond_init(struct net_device *bond_dev);
251 static void bond_uninit(struct net_device *bond_dev);
253 /*---------------------------- General routines -----------------------------*/
255 const char *bond_mode_name(int mode)
257 static const char *names[] = {
258 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
259 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
260 [BOND_MODE_XOR] = "load balancing (xor)",
261 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
262 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
263 [BOND_MODE_TLB] = "transmit load balancing",
264 [BOND_MODE_ALB] = "adaptive load balancing",
267 if (mode < 0 || mode > BOND_MODE_ALB)
273 /*---------------------------------- VLAN -----------------------------------*/
276 * bond_add_vlan - add a new vlan id on bond
277 * @bond: bond that got the notification
278 * @vlan_id: the vlan id to add
280 * Returns -ENOMEM if allocation failed.
282 static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
284 struct vlan_entry *vlan;
286 pr_debug("bond: %s, vlan id %d\n",
287 (bond ? bond->dev->name : "None"), vlan_id);
289 vlan = kzalloc(sizeof(struct vlan_entry), GFP_KERNEL);
293 INIT_LIST_HEAD(&vlan->vlan_list);
294 vlan->vlan_id = vlan_id;
296 write_lock_bh(&bond->lock);
298 list_add_tail(&vlan->vlan_list, &bond->vlan_list);
300 write_unlock_bh(&bond->lock);
302 pr_debug("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
308 * bond_del_vlan - delete a vlan id from bond
309 * @bond: bond that got the notification
310 * @vlan_id: the vlan id to delete
312 * returns -ENODEV if @vlan_id was not found in @bond.
314 static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
316 struct vlan_entry *vlan;
319 pr_debug("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
322 write_lock_bh(&bond->lock);
324 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
325 if (vlan->vlan_id == vlan_id) {
326 list_del(&vlan->vlan_list);
328 if (bond_is_lb(bond))
329 bond_alb_clear_vlan(bond, vlan_id);
331 pr_debug("removed VLAN ID %d from bond %s\n",
332 vlan_id, bond->dev->name);
341 pr_debug("couldn't find VLAN ID %d in bond %s\n",
342 vlan_id, bond->dev->name);
345 write_unlock_bh(&bond->lock);
346 unblock_netpoll_tx();
351 * bond_next_vlan - safely skip to the next item in the vlans list.
352 * @bond: the bond we're working on
353 * @curr: item we're advancing from
355 * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
356 * or @curr->next otherwise (even if it is @curr itself again).
358 * Caller must hold bond->lock
360 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
362 struct vlan_entry *next, *last;
364 if (list_empty(&bond->vlan_list))
368 next = list_entry(bond->vlan_list.next,
369 struct vlan_entry, vlan_list);
371 last = list_entry(bond->vlan_list.prev,
372 struct vlan_entry, vlan_list);
374 next = list_entry(bond->vlan_list.next,
375 struct vlan_entry, vlan_list);
377 next = list_entry(curr->vlan_list.next,
378 struct vlan_entry, vlan_list);
386 * bond_dev_queue_xmit - Prepare skb for xmit.
388 * @bond: bond device that got this skb for tx.
389 * @skb: hw accel VLAN tagged skb to transmit
390 * @slave_dev: slave that is supposed to xmit this skbuff
392 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
393 struct net_device *slave_dev)
395 skb->dev = slave_dev;
397 BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
398 sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
399 skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping;
401 if (unlikely(netpoll_tx_running(bond->dev)))
402 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
410 * In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
411 * We don't protect the slave list iteration with a lock because:
412 * a. This operation is performed in IOCTL context,
413 * b. The operation is protected by the RTNL semaphore in the 8021q code,
414 * c. Holding a lock with BH disabled while directly calling a base driver
415 * entry point is generally a BAD idea.
417 * The design of synchronization/protection for this operation in the 8021q
418 * module is good for one or more VLAN devices over a single physical device
419 * and cannot be extended for a teaming solution like bonding, so there is a
420 * potential race condition here where a net device from the vlan group might
421 * be referenced (either by a base driver or the 8021q code) while it is being
422 * removed from the system. However, it turns out we're not making matters
423 * worse, and if it works for regular VLAN usage it will work here too.
427 * bond_vlan_rx_add_vid - Propagates adding an id to slaves
428 * @bond_dev: bonding net device that got called
429 * @vid: vlan id being added
431 static int bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid)
433 struct bonding *bond = netdev_priv(bond_dev);
434 struct slave *slave, *stop_at;
437 bond_for_each_slave(bond, slave, i) {
438 res = vlan_vid_add(slave->dev, vid);
443 res = bond_add_vlan(bond, vid);
445 pr_err("%s: Error: Failed to add vlan id %d\n",
446 bond_dev->name, vid);
453 /* unwind from head to the slave that failed */
455 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at)
456 vlan_vid_del(slave->dev, vid);
462 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
463 * @bond_dev: bonding net device that got called
464 * @vid: vlan id being removed
466 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid)
468 struct bonding *bond = netdev_priv(bond_dev);
472 bond_for_each_slave(bond, slave, i)
473 vlan_vid_del(slave->dev, vid);
475 res = bond_del_vlan(bond, vid);
477 pr_err("%s: Error: Failed to remove vlan id %d\n",
478 bond_dev->name, vid);
485 static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
487 struct vlan_entry *vlan;
490 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
491 res = vlan_vid_add(slave_dev, vlan->vlan_id);
493 pr_warning("%s: Failed to add vlan id %d to device %s\n",
494 bond->dev->name, vlan->vlan_id,
499 static void bond_del_vlans_from_slave(struct bonding *bond,
500 struct net_device *slave_dev)
502 struct vlan_entry *vlan;
504 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
507 vlan_vid_del(slave_dev, vlan->vlan_id);
511 /*------------------------------- Link status -------------------------------*/
514 * Set the carrier state for the master according to the state of its
515 * slaves. If any slaves are up, the master is up. In 802.3ad mode,
516 * do special 802.3ad magic.
518 * Returns zero if carrier state does not change, nonzero if it does.
520 static int bond_set_carrier(struct bonding *bond)
525 if (bond->slave_cnt == 0)
528 if (bond->params.mode == BOND_MODE_8023AD)
529 return bond_3ad_set_carrier(bond);
531 bond_for_each_slave(bond, slave, i) {
532 if (slave->link == BOND_LINK_UP) {
533 if (!netif_carrier_ok(bond->dev)) {
534 netif_carrier_on(bond->dev);
542 if (netif_carrier_ok(bond->dev)) {
543 netif_carrier_off(bond->dev);
550 * Get link speed and duplex from the slave's base driver
551 * using ethtool. If for some reason the call fails or the
552 * values are invalid, set speed and duplex to -1,
555 static void bond_update_speed_duplex(struct slave *slave)
557 struct net_device *slave_dev = slave->dev;
558 struct ethtool_cmd ecmd;
562 slave->speed = SPEED_UNKNOWN;
563 slave->duplex = DUPLEX_UNKNOWN;
565 res = __ethtool_get_settings(slave_dev, &ecmd);
569 slave_speed = ethtool_cmd_speed(&ecmd);
570 if (slave_speed == 0 || slave_speed == ((__u32) -1))
573 switch (ecmd.duplex) {
581 slave->speed = slave_speed;
582 slave->duplex = ecmd.duplex;
588 * if <dev> supports MII link status reporting, check its link status.
590 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
591 * depending upon the setting of the use_carrier parameter.
593 * Return either BMSR_LSTATUS, meaning that the link is up (or we
594 * can't tell and just pretend it is), or 0, meaning that the link is
597 * If reporting is non-zero, instead of faking link up, return -1 if
598 * both ETHTOOL and MII ioctls fail (meaning the device does not
599 * support them). If use_carrier is set, return whatever it says.
600 * It'd be nice if there was a good way to tell if a driver supports
601 * netif_carrier, but there really isn't.
603 static int bond_check_dev_link(struct bonding *bond,
604 struct net_device *slave_dev, int reporting)
606 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
607 int (*ioctl)(struct net_device *, struct ifreq *, int);
609 struct mii_ioctl_data *mii;
611 if (!reporting && !netif_running(slave_dev))
614 if (bond->params.use_carrier)
615 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
617 /* Try to get link status using Ethtool first. */
618 if (slave_dev->ethtool_ops->get_link)
619 return slave_dev->ethtool_ops->get_link(slave_dev) ?
622 /* Ethtool can't be used, fallback to MII ioctls. */
623 ioctl = slave_ops->ndo_do_ioctl;
625 /* TODO: set pointer to correct ioctl on a per team member */
626 /* bases to make this more efficient. that is, once */
627 /* we determine the correct ioctl, we will always */
628 /* call it and not the others for that team */
632 * We cannot assume that SIOCGMIIPHY will also read a
633 * register; not all network drivers (e.g., e100)
637 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
638 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
640 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
641 mii->reg_num = MII_BMSR;
642 if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
643 return mii->val_out & BMSR_LSTATUS;
648 * If reporting, report that either there's no dev->do_ioctl,
649 * or both SIOCGMIIREG and get_link failed (meaning that we
650 * cannot report link status). If not reporting, pretend
653 return reporting ? -1 : BMSR_LSTATUS;
656 /*----------------------------- Multicast list ------------------------------*/
659 * Push the promiscuity flag down to appropriate slaves
661 static int bond_set_promiscuity(struct bonding *bond, int inc)
664 if (USES_PRIMARY(bond->params.mode)) {
665 /* write lock already acquired */
666 if (bond->curr_active_slave) {
667 err = dev_set_promiscuity(bond->curr_active_slave->dev,
673 bond_for_each_slave(bond, slave, i) {
674 err = dev_set_promiscuity(slave->dev, inc);
683 * Push the allmulti flag down to all slaves
685 static int bond_set_allmulti(struct bonding *bond, int inc)
688 if (USES_PRIMARY(bond->params.mode)) {
689 /* write lock already acquired */
690 if (bond->curr_active_slave) {
691 err = dev_set_allmulti(bond->curr_active_slave->dev,
697 bond_for_each_slave(bond, slave, i) {
698 err = dev_set_allmulti(slave->dev, inc);
707 * Add a Multicast address to slaves
710 static void bond_mc_add(struct bonding *bond, void *addr)
712 if (USES_PRIMARY(bond->params.mode)) {
713 /* write lock already acquired */
714 if (bond->curr_active_slave)
715 dev_mc_add(bond->curr_active_slave->dev, addr);
720 bond_for_each_slave(bond, slave, i)
721 dev_mc_add(slave->dev, addr);
726 * Remove a multicast address from slave
729 static void bond_mc_del(struct bonding *bond, void *addr)
731 if (USES_PRIMARY(bond->params.mode)) {
732 /* write lock already acquired */
733 if (bond->curr_active_slave)
734 dev_mc_del(bond->curr_active_slave->dev, addr);
738 bond_for_each_slave(bond, slave, i) {
739 dev_mc_del(slave->dev, addr);
745 static void __bond_resend_igmp_join_requests(struct net_device *dev)
747 struct in_device *in_dev;
749 in_dev = __in_dev_get_rcu(dev);
751 ip_mc_rejoin_groups(in_dev);
755 * Retrieve the list of registered multicast addresses for the bonding
756 * device and retransmit an IGMP JOIN request to the current active
759 static void bond_resend_igmp_join_requests(struct bonding *bond)
761 struct net_device *bond_dev, *vlan_dev, *upper_dev;
762 struct vlan_entry *vlan;
765 read_lock(&bond->lock);
767 bond_dev = bond->dev;
769 /* rejoin all groups on bond device */
770 __bond_resend_igmp_join_requests(bond_dev);
773 * if bond is enslaved to a bridge,
774 * then rejoin all groups on its master
776 upper_dev = netdev_master_upper_dev_get_rcu(bond_dev);
777 if (upper_dev && upper_dev->priv_flags & IFF_EBRIDGE)
778 __bond_resend_igmp_join_requests(upper_dev);
780 /* rejoin all groups on vlan devices */
781 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
782 vlan_dev = __vlan_find_dev_deep(bond_dev,
785 __bond_resend_igmp_join_requests(vlan_dev);
788 if (--bond->igmp_retrans > 0)
789 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
791 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,
800 bond_resend_igmp_join_requests(bond);
805 * flush all members of flush->mc_list from device dev->mc_list
807 static void bond_mc_list_flush(struct net_device *bond_dev,
808 struct net_device *slave_dev)
810 struct bonding *bond = netdev_priv(bond_dev);
811 struct netdev_hw_addr *ha;
813 netdev_for_each_mc_addr(ha, bond_dev)
814 dev_mc_del(slave_dev, ha->addr);
816 if (bond->params.mode == BOND_MODE_8023AD) {
817 /* del lacpdu mc addr from mc list */
818 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
820 dev_mc_del(slave_dev, lacpdu_multicast);
824 /*--------------------------- Active slave change ---------------------------*/
827 * Update the mc list and multicast-related flags for the new and
828 * old active slaves (if any) according to the multicast mode, and
829 * promiscuous flags unconditionally.
831 static void bond_mc_swap(struct bonding *bond, struct slave *new_active,
832 struct slave *old_active)
834 struct netdev_hw_addr *ha;
836 if (!USES_PRIMARY(bond->params.mode))
837 /* nothing to do - mc list is already up-to-date on
843 if (bond->dev->flags & IFF_PROMISC)
844 dev_set_promiscuity(old_active->dev, -1);
846 if (bond->dev->flags & IFF_ALLMULTI)
847 dev_set_allmulti(old_active->dev, -1);
849 netdev_for_each_mc_addr(ha, bond->dev)
850 dev_mc_del(old_active->dev, ha->addr);
854 /* FIXME: Signal errors upstream. */
855 if (bond->dev->flags & IFF_PROMISC)
856 dev_set_promiscuity(new_active->dev, 1);
858 if (bond->dev->flags & IFF_ALLMULTI)
859 dev_set_allmulti(new_active->dev, 1);
861 netdev_for_each_mc_addr(ha, bond->dev)
862 dev_mc_add(new_active->dev, ha->addr);
867 * bond_do_fail_over_mac
869 * Perform special MAC address swapping for fail_over_mac settings
871 * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh.
873 static void bond_do_fail_over_mac(struct bonding *bond,
874 struct slave *new_active,
875 struct slave *old_active)
876 __releases(&bond->curr_slave_lock)
877 __releases(&bond->lock)
878 __acquires(&bond->lock)
879 __acquires(&bond->curr_slave_lock)
881 u8 tmp_mac[ETH_ALEN];
882 struct sockaddr saddr;
885 switch (bond->params.fail_over_mac) {
886 case BOND_FOM_ACTIVE:
888 memcpy(bond->dev->dev_addr, new_active->dev->dev_addr,
889 new_active->dev->addr_len);
890 write_unlock_bh(&bond->curr_slave_lock);
891 read_unlock(&bond->lock);
892 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
893 read_lock(&bond->lock);
894 write_lock_bh(&bond->curr_slave_lock);
897 case BOND_FOM_FOLLOW:
899 * if new_active && old_active, swap them
900 * if just old_active, do nothing (going to no active slave)
901 * if just new_active, set new_active to bond's MAC
906 write_unlock_bh(&bond->curr_slave_lock);
907 read_unlock(&bond->lock);
910 memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN);
911 memcpy(saddr.sa_data, old_active->dev->dev_addr,
913 saddr.sa_family = new_active->dev->type;
915 memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN);
916 saddr.sa_family = bond->dev->type;
919 rv = dev_set_mac_address(new_active->dev, &saddr);
921 pr_err("%s: Error %d setting MAC of slave %s\n",
922 bond->dev->name, -rv, new_active->dev->name);
929 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN);
930 saddr.sa_family = old_active->dev->type;
932 rv = dev_set_mac_address(old_active->dev, &saddr);
934 pr_err("%s: Error %d setting MAC of slave %s\n",
935 bond->dev->name, -rv, new_active->dev->name);
937 read_lock(&bond->lock);
938 write_lock_bh(&bond->curr_slave_lock);
941 pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n",
942 bond->dev->name, bond->params.fail_over_mac);
948 static bool bond_should_change_active(struct bonding *bond)
950 struct slave *prim = bond->primary_slave;
951 struct slave *curr = bond->curr_active_slave;
953 if (!prim || !curr || curr->link != BOND_LINK_UP)
955 if (bond->force_primary) {
956 bond->force_primary = false;
959 if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
960 (prim->speed < curr->speed ||
961 (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
963 if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
969 * find_best_interface - select the best available slave to be the active one
970 * @bond: our bonding struct
972 * Warning: Caller must hold curr_slave_lock for writing.
974 static struct slave *bond_find_best_slave(struct bonding *bond)
976 struct slave *new_active, *old_active;
977 struct slave *bestslave = NULL;
978 int mintime = bond->params.updelay;
981 new_active = bond->curr_active_slave;
983 if (!new_active) { /* there were no active slaves left */
984 if (bond->slave_cnt > 0) /* found one slave */
985 new_active = bond->first_slave;
987 return NULL; /* still no slave, return NULL */
990 if ((bond->primary_slave) &&
991 bond->primary_slave->link == BOND_LINK_UP &&
992 bond_should_change_active(bond)) {
993 new_active = bond->primary_slave;
996 /* remember where to stop iterating over the slaves */
997 old_active = new_active;
999 bond_for_each_slave_from(bond, new_active, i, old_active) {
1000 if (new_active->link == BOND_LINK_UP) {
1002 } else if (new_active->link == BOND_LINK_BACK &&
1003 IS_UP(new_active->dev)) {
1004 /* link up, but waiting for stabilization */
1005 if (new_active->delay < mintime) {
1006 mintime = new_active->delay;
1007 bestslave = new_active;
1015 static bool bond_should_notify_peers(struct bonding *bond)
1017 struct slave *slave = bond->curr_active_slave;
1019 pr_debug("bond_should_notify_peers: bond %s slave %s\n",
1020 bond->dev->name, slave ? slave->dev->name : "NULL");
1022 if (!slave || !bond->send_peer_notif ||
1023 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
1026 bond->send_peer_notif--;
1031 * change_active_interface - change the active slave into the specified one
1032 * @bond: our bonding struct
1033 * @new: the new slave to make the active one
1035 * Set the new slave to the bond's settings and unset them on the old
1036 * curr_active_slave.
1037 * Setting include flags, mc-list, promiscuity, allmulti, etc.
1039 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1040 * because it is apparently the best available slave we have, even though its
1041 * updelay hasn't timed out yet.
1043 * If new_active is not NULL, caller must hold bond->lock for read and
1044 * curr_slave_lock for write_bh.
1046 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1048 struct slave *old_active = bond->curr_active_slave;
1050 if (old_active == new_active)
1054 new_active->jiffies = jiffies;
1056 if (new_active->link == BOND_LINK_BACK) {
1057 if (USES_PRIMARY(bond->params.mode)) {
1058 pr_info("%s: making interface %s the new active one %d ms earlier.\n",
1059 bond->dev->name, new_active->dev->name,
1060 (bond->params.updelay - new_active->delay) * bond->params.miimon);
1063 new_active->delay = 0;
1064 new_active->link = BOND_LINK_UP;
1066 if (bond->params.mode == BOND_MODE_8023AD)
1067 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1069 if (bond_is_lb(bond))
1070 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1072 if (USES_PRIMARY(bond->params.mode)) {
1073 pr_info("%s: making interface %s the new active one.\n",
1074 bond->dev->name, new_active->dev->name);
1079 if (USES_PRIMARY(bond->params.mode))
1080 bond_mc_swap(bond, new_active, old_active);
1082 if (bond_is_lb(bond)) {
1083 bond_alb_handle_active_change(bond, new_active);
1085 bond_set_slave_inactive_flags(old_active);
1087 bond_set_slave_active_flags(new_active);
1089 bond->curr_active_slave = new_active;
1092 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1094 bond_set_slave_inactive_flags(old_active);
1097 bool should_notify_peers = false;
1099 bond_set_slave_active_flags(new_active);
1101 if (bond->params.fail_over_mac)
1102 bond_do_fail_over_mac(bond, new_active,
1105 if (netif_running(bond->dev)) {
1106 bond->send_peer_notif =
1107 bond->params.num_peer_notif;
1108 should_notify_peers =
1109 bond_should_notify_peers(bond);
1112 write_unlock_bh(&bond->curr_slave_lock);
1113 read_unlock(&bond->lock);
1115 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
1116 if (should_notify_peers)
1117 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
1120 read_lock(&bond->lock);
1121 write_lock_bh(&bond->curr_slave_lock);
1125 /* resend IGMP joins since active slave has changed or
1126 * all were sent on curr_active_slave.
1127 * resend only if bond is brought up with the affected
1128 * bonding modes and the retransmission is enabled */
1129 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
1130 ((USES_PRIMARY(bond->params.mode) && new_active) ||
1131 bond->params.mode == BOND_MODE_ROUNDROBIN)) {
1132 bond->igmp_retrans = bond->params.resend_igmp;
1133 queue_delayed_work(bond->wq, &bond->mcast_work, 0);
1138 * bond_select_active_slave - select a new active slave, if needed
1139 * @bond: our bonding struct
1141 * This functions should be called when one of the following occurs:
1142 * - The old curr_active_slave has been released or lost its link.
1143 * - The primary_slave has got its link back.
1144 * - A slave has got its link back and there's no old curr_active_slave.
1146 * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
1148 void bond_select_active_slave(struct bonding *bond)
1150 struct slave *best_slave;
1153 best_slave = bond_find_best_slave(bond);
1154 if (best_slave != bond->curr_active_slave) {
1155 bond_change_active_slave(bond, best_slave);
1156 rv = bond_set_carrier(bond);
1160 if (netif_carrier_ok(bond->dev)) {
1161 pr_info("%s: first active interface up!\n",
1164 pr_info("%s: now running without any active interface !\n",
1170 /*--------------------------- slave list handling ---------------------------*/
1173 * This function attaches the slave to the end of list.
1175 * bond->lock held for writing by caller.
1177 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1179 if (bond->first_slave == NULL) { /* attaching the first slave */
1180 new_slave->next = new_slave;
1181 new_slave->prev = new_slave;
1182 bond->first_slave = new_slave;
1184 new_slave->next = bond->first_slave;
1185 new_slave->prev = bond->first_slave->prev;
1186 new_slave->next->prev = new_slave;
1187 new_slave->prev->next = new_slave;
1194 * This function detaches the slave from the list.
1195 * WARNING: no check is made to verify if the slave effectively
1196 * belongs to <bond>.
1197 * Nothing is freed on return, structures are just unchained.
1198 * If any slave pointer in bond was pointing to <slave>,
1199 * it should be changed by the calling function.
1201 * bond->lock held for writing by caller.
1203 static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1206 slave->next->prev = slave->prev;
1209 slave->prev->next = slave->next;
1211 if (bond->first_slave == slave) { /* slave is the first slave */
1212 if (bond->slave_cnt > 1) { /* there are more slave */
1213 bond->first_slave = slave->next;
1215 bond->first_slave = NULL; /* slave was the last one */
1224 #ifdef CONFIG_NET_POLL_CONTROLLER
1225 static inline int slave_enable_netpoll(struct slave *slave)
1230 np = kzalloc(sizeof(*np), GFP_ATOMIC);
1235 err = __netpoll_setup(np, slave->dev, GFP_ATOMIC);
1244 static inline void slave_disable_netpoll(struct slave *slave)
1246 struct netpoll *np = slave->np;
1252 __netpoll_free_async(np);
1254 static inline bool slave_dev_support_netpoll(struct net_device *slave_dev)
1256 if (slave_dev->priv_flags & IFF_DISABLE_NETPOLL)
1258 if (!slave_dev->netdev_ops->ndo_poll_controller)
1263 static void bond_poll_controller(struct net_device *bond_dev)
1267 static void __bond_netpoll_cleanup(struct bonding *bond)
1269 struct slave *slave;
1272 bond_for_each_slave(bond, slave, i)
1273 if (IS_UP(slave->dev))
1274 slave_disable_netpoll(slave);
1276 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1278 struct bonding *bond = netdev_priv(bond_dev);
1280 read_lock(&bond->lock);
1281 __bond_netpoll_cleanup(bond);
1282 read_unlock(&bond->lock);
1285 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni, gfp_t gfp)
1287 struct bonding *bond = netdev_priv(dev);
1288 struct slave *slave;
1291 read_lock(&bond->lock);
1292 bond_for_each_slave(bond, slave, i) {
1293 err = slave_enable_netpoll(slave);
1295 __bond_netpoll_cleanup(bond);
1299 read_unlock(&bond->lock);
1303 static struct netpoll_info *bond_netpoll_info(struct bonding *bond)
1305 return bond->dev->npinfo;
1309 static inline int slave_enable_netpoll(struct slave *slave)
1313 static inline void slave_disable_netpoll(struct slave *slave)
1316 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1321 /*---------------------------------- IOCTL ----------------------------------*/
1323 static void bond_set_dev_addr(struct net_device *bond_dev,
1324 struct net_device *slave_dev)
1326 pr_debug("bond_dev=%p\n", bond_dev);
1327 pr_debug("slave_dev=%p\n", slave_dev);
1328 pr_debug("slave_dev->addr_len=%d\n", slave_dev->addr_len);
1329 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
1330 bond_dev->addr_assign_type = NET_ADDR_SET;
1331 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
1334 static netdev_features_t bond_fix_features(struct net_device *dev,
1335 netdev_features_t features)
1337 struct slave *slave;
1338 struct bonding *bond = netdev_priv(dev);
1339 netdev_features_t mask;
1342 read_lock(&bond->lock);
1344 if (!bond->first_slave) {
1345 /* Disable adding VLANs to empty bond. But why? --mq */
1346 features |= NETIF_F_VLAN_CHALLENGED;
1351 features &= ~NETIF_F_ONE_FOR_ALL;
1352 features |= NETIF_F_ALL_FOR_ALL;
1354 bond_for_each_slave(bond, slave, i) {
1355 features = netdev_increment_features(features,
1356 slave->dev->features,
1361 read_unlock(&bond->lock);
1365 #define BOND_VLAN_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | \
1366 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1367 NETIF_F_HIGHDMA | NETIF_F_LRO)
1369 static void bond_compute_features(struct bonding *bond)
1371 struct slave *slave;
1372 struct net_device *bond_dev = bond->dev;
1373 netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1374 unsigned short max_hard_header_len = ETH_HLEN;
1375 unsigned int gso_max_size = GSO_MAX_SIZE;
1376 u16 gso_max_segs = GSO_MAX_SEGS;
1378 unsigned int flags, dst_release_flag = IFF_XMIT_DST_RELEASE;
1380 read_lock(&bond->lock);
1382 if (!bond->first_slave)
1385 bond_for_each_slave(bond, slave, i) {
1386 vlan_features = netdev_increment_features(vlan_features,
1387 slave->dev->vlan_features, BOND_VLAN_FEATURES);
1389 dst_release_flag &= slave->dev->priv_flags;
1390 if (slave->dev->hard_header_len > max_hard_header_len)
1391 max_hard_header_len = slave->dev->hard_header_len;
1393 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1394 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1398 bond_dev->vlan_features = vlan_features;
1399 bond_dev->hard_header_len = max_hard_header_len;
1400 bond_dev->gso_max_segs = gso_max_segs;
1401 netif_set_gso_max_size(bond_dev, gso_max_size);
1403 flags = bond_dev->priv_flags & ~IFF_XMIT_DST_RELEASE;
1404 bond_dev->priv_flags = flags | dst_release_flag;
1406 read_unlock(&bond->lock);
1408 netdev_change_features(bond_dev);
1411 static void bond_setup_by_slave(struct net_device *bond_dev,
1412 struct net_device *slave_dev)
1414 struct bonding *bond = netdev_priv(bond_dev);
1416 bond_dev->header_ops = slave_dev->header_ops;
1418 bond_dev->type = slave_dev->type;
1419 bond_dev->hard_header_len = slave_dev->hard_header_len;
1420 bond_dev->addr_len = slave_dev->addr_len;
1422 memcpy(bond_dev->broadcast, slave_dev->broadcast,
1423 slave_dev->addr_len);
1424 bond->setup_by_slave = 1;
1427 /* On bonding slaves other than the currently active slave, suppress
1428 * duplicates except for alb non-mcast/bcast.
1430 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1431 struct slave *slave,
1432 struct bonding *bond)
1434 if (bond_is_slave_inactive(slave)) {
1435 if (bond->params.mode == BOND_MODE_ALB &&
1436 skb->pkt_type != PACKET_BROADCAST &&
1437 skb->pkt_type != PACKET_MULTICAST)
1444 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1446 struct sk_buff *skb = *pskb;
1447 struct slave *slave;
1448 struct bonding *bond;
1449 int (*recv_probe)(const struct sk_buff *, struct bonding *,
1451 int ret = RX_HANDLER_ANOTHER;
1453 skb = skb_share_check(skb, GFP_ATOMIC);
1455 return RX_HANDLER_CONSUMED;
1459 slave = bond_slave_get_rcu(skb->dev);
1462 if (bond->params.arp_interval)
1463 slave->dev->last_rx = jiffies;
1465 recv_probe = ACCESS_ONCE(bond->recv_probe);
1467 ret = recv_probe(skb, bond, slave);
1468 if (ret == RX_HANDLER_CONSUMED) {
1474 if (bond_should_deliver_exact_match(skb, slave, bond)) {
1475 return RX_HANDLER_EXACT;
1478 skb->dev = bond->dev;
1480 if (bond->params.mode == BOND_MODE_ALB &&
1481 bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1482 skb->pkt_type == PACKET_HOST) {
1484 if (unlikely(skb_cow_head(skb,
1485 skb->data - skb_mac_header(skb)))) {
1487 return RX_HANDLER_CONSUMED;
1489 memcpy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, ETH_ALEN);
1495 static int bond_master_upper_dev_link(struct net_device *bond_dev,
1496 struct net_device *slave_dev)
1500 err = netdev_master_upper_dev_link(slave_dev, bond_dev);
1503 slave_dev->flags |= IFF_SLAVE;
1504 rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE);
1508 static void bond_upper_dev_unlink(struct net_device *bond_dev,
1509 struct net_device *slave_dev)
1511 netdev_upper_dev_unlink(slave_dev, bond_dev);
1512 slave_dev->flags &= ~IFF_SLAVE;
1513 rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE);
1516 /* enslave device <slave> to bond device <master> */
1517 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1519 struct bonding *bond = netdev_priv(bond_dev);
1520 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1521 struct slave *new_slave = NULL;
1522 struct netdev_hw_addr *ha;
1523 struct sockaddr addr;
1527 if (!bond->params.use_carrier &&
1528 slave_dev->ethtool_ops->get_link == NULL &&
1529 slave_ops->ndo_do_ioctl == NULL) {
1530 pr_warning("%s: Warning: no link monitoring support for %s\n",
1531 bond_dev->name, slave_dev->name);
1534 /* already enslaved */
1535 if (slave_dev->flags & IFF_SLAVE) {
1536 pr_debug("Error, Device was already enslaved\n");
1540 /* vlan challenged mutual exclusion */
1541 /* no need to lock since we're protected by rtnl_lock */
1542 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1543 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1544 if (vlan_uses_dev(bond_dev)) {
1545 pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1546 bond_dev->name, slave_dev->name, bond_dev->name);
1549 pr_warning("%s: Warning: enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1550 bond_dev->name, slave_dev->name,
1551 slave_dev->name, bond_dev->name);
1554 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1558 * Old ifenslave binaries are no longer supported. These can
1559 * be identified with moderate accuracy by the state of the slave:
1560 * the current ifenslave will set the interface down prior to
1561 * enslaving it; the old ifenslave will not.
1563 if ((slave_dev->flags & IFF_UP)) {
1564 pr_err("%s is up. This may be due to an out of date ifenslave.\n",
1567 goto err_undo_flags;
1570 /* set bonding device ether type by slave - bonding netdevices are
1571 * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1572 * there is a need to override some of the type dependent attribs/funcs.
1574 * bond ether type mutual exclusion - don't allow slaves of dissimilar
1575 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1577 if (bond->slave_cnt == 0) {
1578 if (bond_dev->type != slave_dev->type) {
1579 pr_debug("%s: change device type from %d to %d\n",
1581 bond_dev->type, slave_dev->type);
1583 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1585 res = notifier_to_errno(res);
1587 pr_err("%s: refused to change device type\n",
1590 goto err_undo_flags;
1593 /* Flush unicast and multicast addresses */
1594 dev_uc_flush(bond_dev);
1595 dev_mc_flush(bond_dev);
1597 if (slave_dev->type != ARPHRD_ETHER)
1598 bond_setup_by_slave(bond_dev, slave_dev);
1600 ether_setup(bond_dev);
1601 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1604 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1607 } else if (bond_dev->type != slave_dev->type) {
1608 pr_err("%s ether type (%d) is different from other slaves (%d), can not enslave it.\n",
1610 slave_dev->type, bond_dev->type);
1612 goto err_undo_flags;
1615 if (slave_ops->ndo_set_mac_address == NULL) {
1616 if (bond->slave_cnt == 0) {
1617 pr_warning("%s: Warning: The first slave device specified does not support setting the MAC address. Setting fail_over_mac to active.",
1619 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1620 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1621 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",
1624 goto err_undo_flags;
1628 call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1630 /* If this is the first slave, then we need to set the master's hardware
1631 * address to be the same as the slave's. */
1632 if (bond->slave_cnt == 0 && bond->dev_addr_from_first)
1633 bond_set_dev_addr(bond->dev, slave_dev);
1635 new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1638 goto err_undo_flags;
1642 * Set the new_slave's queue_id to be zero. Queue ID mapping
1643 * is set via sysfs or module option if desired.
1645 new_slave->queue_id = 0;
1647 /* Save slave's original mtu and then set it to match the bond */
1648 new_slave->original_mtu = slave_dev->mtu;
1649 res = dev_set_mtu(slave_dev, bond->dev->mtu);
1651 pr_debug("Error %d calling dev_set_mtu\n", res);
1656 * Save slave's original ("permanent") mac address for modes
1657 * that need it, and for restoring it upon release, and then
1658 * set it to the master's address
1660 memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1662 if (!bond->params.fail_over_mac) {
1664 * Set slave to master's mac address. The application already
1665 * set the master's mac address to that of the first slave
1667 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1668 addr.sa_family = slave_dev->type;
1669 res = dev_set_mac_address(slave_dev, &addr);
1671 pr_debug("Error %d calling set_mac_address\n", res);
1672 goto err_restore_mtu;
1676 res = bond_master_upper_dev_link(bond_dev, slave_dev);
1678 pr_debug("Error %d calling bond_master_upper_dev_link\n", res);
1679 goto err_restore_mac;
1682 /* open the slave since the application closed it */
1683 res = dev_open(slave_dev);
1685 pr_debug("Opening slave %s failed\n", slave_dev->name);
1686 goto err_unset_master;
1689 new_slave->bond = bond;
1690 new_slave->dev = slave_dev;
1691 slave_dev->priv_flags |= IFF_BONDING;
1693 if (bond_is_lb(bond)) {
1694 /* bond_alb_init_slave() must be called before all other stages since
1695 * it might fail and we do not want to have to undo everything
1697 res = bond_alb_init_slave(bond, new_slave);
1702 /* If the mode USES_PRIMARY, then the new slave gets the
1703 * master's promisc (and mc) settings only if it becomes the
1704 * curr_active_slave, and that is taken care of later when calling
1705 * bond_change_active()
1707 if (!USES_PRIMARY(bond->params.mode)) {
1708 /* set promiscuity level to new slave */
1709 if (bond_dev->flags & IFF_PROMISC) {
1710 res = dev_set_promiscuity(slave_dev, 1);
1715 /* set allmulti level to new slave */
1716 if (bond_dev->flags & IFF_ALLMULTI) {
1717 res = dev_set_allmulti(slave_dev, 1);
1722 netif_addr_lock_bh(bond_dev);
1723 /* upload master's mc_list to new slave */
1724 netdev_for_each_mc_addr(ha, bond_dev)
1725 dev_mc_add(slave_dev, ha->addr);
1726 netif_addr_unlock_bh(bond_dev);
1729 if (bond->params.mode == BOND_MODE_8023AD) {
1730 /* add lacpdu mc addr to mc list */
1731 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1733 dev_mc_add(slave_dev, lacpdu_multicast);
1736 bond_add_vlans_on_slave(bond, slave_dev);
1738 write_lock_bh(&bond->lock);
1740 bond_attach_slave(bond, new_slave);
1742 new_slave->delay = 0;
1743 new_slave->link_failure_count = 0;
1745 write_unlock_bh(&bond->lock);
1747 bond_compute_features(bond);
1749 bond_update_speed_duplex(new_slave);
1751 read_lock(&bond->lock);
1753 new_slave->last_arp_rx = jiffies -
1754 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1756 if (bond->params.miimon && !bond->params.use_carrier) {
1757 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1759 if ((link_reporting == -1) && !bond->params.arp_interval) {
1761 * miimon is set but a bonded network driver
1762 * does not support ETHTOOL/MII and
1763 * arp_interval is not set. Note: if
1764 * use_carrier is enabled, we will never go
1765 * here (because netif_carrier is always
1766 * supported); thus, we don't need to change
1767 * the messages for netif_carrier.
1769 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",
1770 bond_dev->name, slave_dev->name);
1771 } else if (link_reporting == -1) {
1772 /* unable get link status using mii/ethtool */
1773 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",
1774 bond_dev->name, slave_dev->name);
1778 /* check for initial state */
1779 if (bond->params.miimon) {
1780 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1781 if (bond->params.updelay) {
1782 new_slave->link = BOND_LINK_BACK;
1783 new_slave->delay = bond->params.updelay;
1785 new_slave->link = BOND_LINK_UP;
1788 new_slave->link = BOND_LINK_DOWN;
1790 } else if (bond->params.arp_interval) {
1791 new_slave->link = (netif_carrier_ok(slave_dev) ?
1792 BOND_LINK_UP : BOND_LINK_DOWN);
1794 new_slave->link = BOND_LINK_UP;
1797 if (new_slave->link != BOND_LINK_DOWN)
1798 new_slave->jiffies = jiffies;
1799 pr_debug("Initial state of slave_dev is BOND_LINK_%s\n",
1800 new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1801 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1803 if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1804 /* if there is a primary slave, remember it */
1805 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1806 bond->primary_slave = new_slave;
1807 bond->force_primary = true;
1811 write_lock_bh(&bond->curr_slave_lock);
1813 switch (bond->params.mode) {
1814 case BOND_MODE_ACTIVEBACKUP:
1815 bond_set_slave_inactive_flags(new_slave);
1816 bond_select_active_slave(bond);
1818 case BOND_MODE_8023AD:
1819 /* in 802.3ad mode, the internal mechanism
1820 * will activate the slaves in the selected
1823 bond_set_slave_inactive_flags(new_slave);
1824 /* if this is the first slave */
1825 if (bond->slave_cnt == 1) {
1826 SLAVE_AD_INFO(new_slave).id = 1;
1827 /* Initialize AD with the number of times that the AD timer is called in 1 second
1828 * can be called only after the mac address of the bond is set
1830 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1832 SLAVE_AD_INFO(new_slave).id =
1833 SLAVE_AD_INFO(new_slave->prev).id + 1;
1836 bond_3ad_bind_slave(new_slave);
1840 bond_set_active_slave(new_slave);
1841 bond_set_slave_inactive_flags(new_slave);
1842 bond_select_active_slave(bond);
1845 pr_debug("This slave is always active in trunk mode\n");
1847 /* always active in trunk mode */
1848 bond_set_active_slave(new_slave);
1850 /* In trunking mode there is little meaning to curr_active_slave
1851 * anyway (it holds no special properties of the bond device),
1852 * so we can change it without calling change_active_interface()
1854 if (!bond->curr_active_slave && new_slave->link == BOND_LINK_UP)
1855 bond->curr_active_slave = new_slave;
1858 } /* switch(bond_mode) */
1860 write_unlock_bh(&bond->curr_slave_lock);
1862 bond_set_carrier(bond);
1864 #ifdef CONFIG_NET_POLL_CONTROLLER
1865 slave_dev->npinfo = bond_netpoll_info(bond);
1866 if (slave_dev->npinfo) {
1867 if (slave_enable_netpoll(new_slave)) {
1868 read_unlock(&bond->lock);
1869 pr_info("Error, %s: master_dev is using netpoll, "
1870 "but new slave device does not support netpoll.\n",
1878 read_unlock(&bond->lock);
1880 res = bond_create_slave_symlinks(bond_dev, slave_dev);
1884 res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1887 pr_debug("Error %d calling netdev_rx_handler_register\n", res);
1888 goto err_dest_symlinks;
1891 pr_info("%s: enslaving %s as a%s interface with a%s link.\n",
1892 bond_dev->name, slave_dev->name,
1893 bond_is_active_slave(new_slave) ? "n active" : " backup",
1894 new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1896 /* enslave is successful */
1899 /* Undo stages on error */
1901 bond_destroy_slave_symlinks(bond_dev, slave_dev);
1904 write_lock_bh(&bond->lock);
1905 bond_detach_slave(bond, new_slave);
1906 write_unlock_bh(&bond->lock);
1909 dev_close(slave_dev);
1912 bond_upper_dev_unlink(bond_dev, slave_dev);
1915 if (!bond->params.fail_over_mac) {
1916 /* XXX TODO - fom follow mode needs to change master's
1917 * MAC if this slave's MAC is in use by the bond, or at
1918 * least print a warning.
1920 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1921 addr.sa_family = slave_dev->type;
1922 dev_set_mac_address(slave_dev, &addr);
1926 dev_set_mtu(slave_dev, new_slave->original_mtu);
1932 bond_compute_features(bond);
1938 * Try to release the slave device <slave> from the bond device <master>
1939 * It is legal to access curr_active_slave without a lock because all the function
1940 * is write-locked. If "all" is true it means that the function is being called
1941 * while destroying a bond interface and all slaves are being released.
1943 * The rules for slave state should be:
1944 * for Active/Backup:
1945 * Active stays on all backups go down
1946 * for Bonded connections:
1947 * The first up interface should be left on and all others downed.
1949 static int __bond_release_one(struct net_device *bond_dev,
1950 struct net_device *slave_dev,
1953 struct bonding *bond = netdev_priv(bond_dev);
1954 struct slave *slave, *oldcurrent;
1955 struct sockaddr addr;
1956 netdev_features_t old_features = bond_dev->features;
1958 /* slave is not a slave or master is not master of this slave */
1959 if (!(slave_dev->flags & IFF_SLAVE) ||
1960 !netdev_has_upper_dev(slave_dev, bond_dev)) {
1961 pr_err("%s: Error: cannot release %s.\n",
1962 bond_dev->name, slave_dev->name);
1967 write_lock_bh(&bond->lock);
1969 slave = bond_get_slave_by_dev(bond, slave_dev);
1971 /* not a slave of this bond */
1972 pr_info("%s: %s not enslaved\n",
1973 bond_dev->name, slave_dev->name);
1974 write_unlock_bh(&bond->lock);
1975 unblock_netpoll_tx();
1979 /* unregister rx_handler early so bond_handle_frame wouldn't be called
1980 * for this slave anymore.
1982 netdev_rx_handler_unregister(slave_dev);
1983 write_unlock_bh(&bond->lock);
1985 write_lock_bh(&bond->lock);
1987 if (!all && !bond->params.fail_over_mac) {
1988 if (ether_addr_equal(bond_dev->dev_addr, slave->perm_hwaddr) &&
1989 bond->slave_cnt > 1)
1990 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",
1991 bond_dev->name, slave_dev->name,
1993 bond_dev->name, slave_dev->name);
1996 /* Inform AD package of unbinding of slave. */
1997 if (bond->params.mode == BOND_MODE_8023AD) {
1998 /* must be called before the slave is
1999 * detached from the list
2001 bond_3ad_unbind_slave(slave);
2004 pr_info("%s: releasing %s interface %s\n",
2006 bond_is_active_slave(slave) ? "active" : "backup",
2009 oldcurrent = bond->curr_active_slave;
2011 bond->current_arp_slave = NULL;
2013 /* release the slave from its bond */
2014 bond_detach_slave(bond, slave);
2016 if (bond->primary_slave == slave)
2017 bond->primary_slave = NULL;
2019 if (oldcurrent == slave)
2020 bond_change_active_slave(bond, NULL);
2022 if (bond_is_lb(bond)) {
2023 /* Must be called only after the slave has been
2024 * detached from the list and the curr_active_slave
2025 * has been cleared (if our_slave == old_current),
2026 * but before a new active slave is selected.
2028 write_unlock_bh(&bond->lock);
2029 bond_alb_deinit_slave(bond, slave);
2030 write_lock_bh(&bond->lock);
2034 bond->curr_active_slave = NULL;
2035 } else if (oldcurrent == slave) {
2037 * Note that we hold RTNL over this sequence, so there
2038 * is no concern that another slave add/remove event
2041 write_unlock_bh(&bond->lock);
2042 read_lock(&bond->lock);
2043 write_lock_bh(&bond->curr_slave_lock);
2045 bond_select_active_slave(bond);
2047 write_unlock_bh(&bond->curr_slave_lock);
2048 read_unlock(&bond->lock);
2049 write_lock_bh(&bond->lock);
2052 if (bond->slave_cnt == 0) {
2053 bond_set_carrier(bond);
2054 eth_hw_addr_random(bond_dev);
2055 bond->dev_addr_from_first = true;
2057 if (bond_vlan_used(bond)) {
2058 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
2059 bond_dev->name, bond_dev->name);
2060 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
2065 write_unlock_bh(&bond->lock);
2066 unblock_netpoll_tx();
2068 if (bond->slave_cnt == 0) {
2069 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
2070 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
2073 bond_compute_features(bond);
2074 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
2075 (old_features & NETIF_F_VLAN_CHALLENGED))
2076 pr_info("%s: last VLAN challenged slave %s left bond %s. VLAN blocking is removed\n",
2077 bond_dev->name, slave_dev->name, bond_dev->name);
2079 /* must do this from outside any spinlocks */
2080 bond_destroy_slave_symlinks(bond_dev, slave_dev);
2082 bond_del_vlans_from_slave(bond, slave_dev);
2084 /* If the mode USES_PRIMARY, then we should only remove its
2085 * promisc and mc settings if it was the curr_active_slave, but that was
2086 * already taken care of above when we detached the slave
2088 if (!USES_PRIMARY(bond->params.mode)) {
2089 /* unset promiscuity level from slave */
2090 if (bond_dev->flags & IFF_PROMISC)
2091 dev_set_promiscuity(slave_dev, -1);
2093 /* unset allmulti level from slave */
2094 if (bond_dev->flags & IFF_ALLMULTI)
2095 dev_set_allmulti(slave_dev, -1);
2097 /* flush master's mc_list from slave */
2098 netif_addr_lock_bh(bond_dev);
2099 bond_mc_list_flush(bond_dev, slave_dev);
2100 netif_addr_unlock_bh(bond_dev);
2103 bond_upper_dev_unlink(bond_dev, slave_dev);
2105 slave_disable_netpoll(slave);
2107 /* close slave before restoring its mac address */
2108 dev_close(slave_dev);
2110 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
2111 /* restore original ("permanent") mac address */
2112 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2113 addr.sa_family = slave_dev->type;
2114 dev_set_mac_address(slave_dev, &addr);
2117 dev_set_mtu(slave_dev, slave->original_mtu);
2119 slave_dev->priv_flags &= ~IFF_BONDING;
2123 return 0; /* deletion OK */
2126 /* A wrapper used because of ndo_del_link */
2127 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
2129 return __bond_release_one(bond_dev, slave_dev, false);
2133 * First release a slave and then destroy the bond if no more slaves are left.
2134 * Must be under rtnl_lock when this function is called.
2136 static int bond_release_and_destroy(struct net_device *bond_dev,
2137 struct net_device *slave_dev)
2139 struct bonding *bond = netdev_priv(bond_dev);
2142 ret = bond_release(bond_dev, slave_dev);
2143 if ((ret == 0) && (bond->slave_cnt == 0)) {
2144 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
2145 pr_info("%s: destroying bond %s.\n",
2146 bond_dev->name, bond_dev->name);
2147 unregister_netdevice(bond_dev);
2153 * This function changes the active slave to slave <slave_dev>.
2154 * It returns -EINVAL in the following cases.
2155 * - <slave_dev> is not found in the list.
2156 * - There is not active slave now.
2157 * - <slave_dev> is already active.
2158 * - The link state of <slave_dev> is not BOND_LINK_UP.
2159 * - <slave_dev> is not running.
2160 * In these cases, this function does nothing.
2161 * In the other cases, current_slave pointer is changed and 0 is returned.
2163 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
2165 struct bonding *bond = netdev_priv(bond_dev);
2166 struct slave *old_active = NULL;
2167 struct slave *new_active = NULL;
2170 if (!USES_PRIMARY(bond->params.mode))
2173 /* Verify that bond_dev is indeed the master of slave_dev */
2174 if (!(slave_dev->flags & IFF_SLAVE) ||
2175 !netdev_has_upper_dev(slave_dev, bond_dev))
2178 read_lock(&bond->lock);
2180 read_lock(&bond->curr_slave_lock);
2181 old_active = bond->curr_active_slave;
2182 read_unlock(&bond->curr_slave_lock);
2184 new_active = bond_get_slave_by_dev(bond, slave_dev);
2187 * Changing to the current active: do nothing; return success.
2189 if (new_active && (new_active == old_active)) {
2190 read_unlock(&bond->lock);
2196 (new_active->link == BOND_LINK_UP) &&
2197 IS_UP(new_active->dev)) {
2199 write_lock_bh(&bond->curr_slave_lock);
2200 bond_change_active_slave(bond, new_active);
2201 write_unlock_bh(&bond->curr_slave_lock);
2202 unblock_netpoll_tx();
2206 read_unlock(&bond->lock);
2211 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2213 struct bonding *bond = netdev_priv(bond_dev);
2215 info->bond_mode = bond->params.mode;
2216 info->miimon = bond->params.miimon;
2218 read_lock(&bond->lock);
2219 info->num_slaves = bond->slave_cnt;
2220 read_unlock(&bond->lock);
2225 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2227 struct bonding *bond = netdev_priv(bond_dev);
2228 struct slave *slave;
2229 int i, res = -ENODEV;
2231 read_lock(&bond->lock);
2233 bond_for_each_slave(bond, slave, i) {
2234 if (i == (int)info->slave_id) {
2236 strcpy(info->slave_name, slave->dev->name);
2237 info->link = slave->link;
2238 info->state = bond_slave_state(slave);
2239 info->link_failure_count = slave->link_failure_count;
2244 read_unlock(&bond->lock);
2249 /*-------------------------------- Monitoring -------------------------------*/
2252 static int bond_miimon_inspect(struct bonding *bond)
2254 struct slave *slave;
2255 int i, link_state, commit = 0;
2256 bool ignore_updelay;
2258 ignore_updelay = !bond->curr_active_slave ? true : false;
2260 bond_for_each_slave(bond, slave, i) {
2261 slave->new_link = BOND_LINK_NOCHANGE;
2263 link_state = bond_check_dev_link(bond, slave->dev, 0);
2265 switch (slave->link) {
2270 slave->link = BOND_LINK_FAIL;
2271 slave->delay = bond->params.downdelay;
2273 pr_info("%s: link status down for %sinterface %s, disabling it in %d ms.\n",
2275 (bond->params.mode ==
2276 BOND_MODE_ACTIVEBACKUP) ?
2277 (bond_is_active_slave(slave) ?
2278 "active " : "backup ") : "",
2280 bond->params.downdelay * bond->params.miimon);
2283 case BOND_LINK_FAIL:
2286 * recovered before downdelay expired
2288 slave->link = BOND_LINK_UP;
2289 slave->jiffies = jiffies;
2290 pr_info("%s: link status up again after %d ms for interface %s.\n",
2292 (bond->params.downdelay - slave->delay) *
2293 bond->params.miimon,
2298 if (slave->delay <= 0) {
2299 slave->new_link = BOND_LINK_DOWN;
2307 case BOND_LINK_DOWN:
2311 slave->link = BOND_LINK_BACK;
2312 slave->delay = bond->params.updelay;
2315 pr_info("%s: link status up for interface %s, enabling it in %d ms.\n",
2316 bond->dev->name, slave->dev->name,
2317 ignore_updelay ? 0 :
2318 bond->params.updelay *
2319 bond->params.miimon);
2322 case BOND_LINK_BACK:
2324 slave->link = BOND_LINK_DOWN;
2325 pr_info("%s: link status down again after %d ms for interface %s.\n",
2327 (bond->params.updelay - slave->delay) *
2328 bond->params.miimon,
2337 if (slave->delay <= 0) {
2338 slave->new_link = BOND_LINK_UP;
2340 ignore_updelay = false;
2352 static void bond_miimon_commit(struct bonding *bond)
2354 struct slave *slave;
2357 bond_for_each_slave(bond, slave, i) {
2358 switch (slave->new_link) {
2359 case BOND_LINK_NOCHANGE:
2363 slave->link = BOND_LINK_UP;
2364 slave->jiffies = jiffies;
2366 if (bond->params.mode == BOND_MODE_8023AD) {
2367 /* prevent it from being the active one */
2368 bond_set_backup_slave(slave);
2369 } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2370 /* make it immediately active */
2371 bond_set_active_slave(slave);
2372 } else if (slave != bond->primary_slave) {
2373 /* prevent it from being the active one */
2374 bond_set_backup_slave(slave);
2377 pr_info("%s: link status definitely up for interface %s, %u Mbps %s duplex.\n",
2378 bond->dev->name, slave->dev->name,
2379 slave->speed, slave->duplex ? "full" : "half");
2381 /* notify ad that the link status has changed */
2382 if (bond->params.mode == BOND_MODE_8023AD)
2383 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2385 if (bond_is_lb(bond))
2386 bond_alb_handle_link_change(bond, slave,
2389 if (!bond->curr_active_slave ||
2390 (slave == bond->primary_slave))
2395 case BOND_LINK_DOWN:
2396 if (slave->link_failure_count < UINT_MAX)
2397 slave->link_failure_count++;
2399 slave->link = BOND_LINK_DOWN;
2401 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
2402 bond->params.mode == BOND_MODE_8023AD)
2403 bond_set_slave_inactive_flags(slave);
2405 pr_info("%s: link status definitely down for interface %s, disabling it\n",
2406 bond->dev->name, slave->dev->name);
2408 if (bond->params.mode == BOND_MODE_8023AD)
2409 bond_3ad_handle_link_change(slave,
2412 if (bond_is_lb(bond))
2413 bond_alb_handle_link_change(bond, slave,
2416 if (slave == bond->curr_active_slave)
2422 pr_err("%s: invalid new link %d on slave %s\n",
2423 bond->dev->name, slave->new_link,
2425 slave->new_link = BOND_LINK_NOCHANGE;
2433 write_lock_bh(&bond->curr_slave_lock);
2434 bond_select_active_slave(bond);
2435 write_unlock_bh(&bond->curr_slave_lock);
2436 unblock_netpoll_tx();
2439 bond_set_carrier(bond);
2445 * Really a wrapper that splits the mii monitor into two phases: an
2446 * inspection, then (if inspection indicates something needs to be done)
2447 * an acquisition of appropriate locks followed by a commit phase to
2448 * implement whatever link state changes are indicated.
2450 void bond_mii_monitor(struct work_struct *work)
2452 struct bonding *bond = container_of(work, struct bonding,
2454 bool should_notify_peers = false;
2455 unsigned long delay;
2457 read_lock(&bond->lock);
2459 delay = msecs_to_jiffies(bond->params.miimon);
2461 if (bond->slave_cnt == 0)
2464 should_notify_peers = bond_should_notify_peers(bond);
2466 if (bond_miimon_inspect(bond)) {
2467 read_unlock(&bond->lock);
2469 /* Race avoidance with bond_close cancel of workqueue */
2470 if (!rtnl_trylock()) {
2471 read_lock(&bond->lock);
2473 should_notify_peers = false;
2477 read_lock(&bond->lock);
2479 bond_miimon_commit(bond);
2481 read_unlock(&bond->lock);
2482 rtnl_unlock(); /* might sleep, hold no other locks */
2483 read_lock(&bond->lock);
2487 if (bond->params.miimon)
2488 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2490 read_unlock(&bond->lock);
2492 if (should_notify_peers) {
2493 if (!rtnl_trylock()) {
2494 read_lock(&bond->lock);
2495 bond->send_peer_notif++;
2496 read_unlock(&bond->lock);
2499 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2504 static int bond_has_this_ip(struct bonding *bond, __be32 ip)
2506 struct vlan_entry *vlan;
2507 struct net_device *vlan_dev;
2509 if (ip == bond_confirm_addr(bond->dev, 0, ip))
2512 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2514 vlan_dev = __vlan_find_dev_deep(bond->dev, vlan->vlan_id);
2516 if (vlan_dev && ip == bond_confirm_addr(vlan_dev, 0, ip))
2524 * We go to the (large) trouble of VLAN tagging ARP frames because
2525 * switches in VLAN mode (especially if ports are configured as
2526 * "native" to a VLAN) might not pass non-tagged frames.
2528 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2530 struct sk_buff *skb;
2532 pr_debug("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2533 slave_dev->name, dest_ip, src_ip, vlan_id);
2535 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2536 NULL, slave_dev->dev_addr, NULL);
2539 pr_err("ARP packet allocation failed\n");
2543 skb = vlan_put_tag(skb, vlan_id);
2545 pr_err("failed to insert VLAN tag\n");
2553 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2556 __be32 *targets = bond->params.arp_targets;
2557 struct vlan_entry *vlan;
2558 struct net_device *vlan_dev = NULL;
2561 for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2565 pr_debug("basa: target %x\n", targets[i]);
2566 if (!bond_vlan_used(bond)) {
2567 pr_debug("basa: empty vlan: arp_send\n");
2568 addr = bond_confirm_addr(bond->dev, targets[i], 0);
2569 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2575 * If VLANs are configured, we do a route lookup to
2576 * determine which VLAN interface would be used, so we
2577 * can tag the ARP with the proper VLAN tag.
2579 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2582 if (net_ratelimit()) {
2583 pr_warning("%s: no route to arp_ip_target %pI4\n",
2584 bond->dev->name, &targets[i]);
2590 * This target is not on a VLAN
2592 if (rt->dst.dev == bond->dev) {
2594 pr_debug("basa: rtdev == bond->dev: arp_send\n");
2595 addr = bond_confirm_addr(bond->dev, targets[i], 0);
2596 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2602 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2604 vlan_dev = __vlan_find_dev_deep(bond->dev,
2607 if (vlan_dev == rt->dst.dev) {
2608 vlan_id = vlan->vlan_id;
2609 pr_debug("basa: vlan match on %s %d\n",
2610 vlan_dev->name, vlan_id);
2615 if (vlan_id && vlan_dev) {
2617 addr = bond_confirm_addr(vlan_dev, targets[i], 0);
2618 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2623 if (net_ratelimit()) {
2624 pr_warning("%s: no path to arp_ip_target %pI4 via rt.dev %s\n",
2625 bond->dev->name, &targets[i],
2626 rt->dst.dev ? rt->dst.dev->name : "NULL");
2632 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2635 __be32 *targets = bond->params.arp_targets;
2637 for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2638 pr_debug("bva: sip %pI4 tip %pI4 t[%d] %pI4 bhti(tip) %d\n",
2639 &sip, &tip, i, &targets[i],
2640 bond_has_this_ip(bond, tip));
2641 if (sip == targets[i]) {
2642 if (bond_has_this_ip(bond, tip))
2643 slave->last_arp_rx = jiffies;
2649 static int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2650 struct slave *slave)
2652 struct arphdr *arp = (struct arphdr *)skb->data;
2653 unsigned char *arp_ptr;
2657 if (skb->protocol != __cpu_to_be16(ETH_P_ARP))
2658 return RX_HANDLER_ANOTHER;
2660 read_lock(&bond->lock);
2661 alen = arp_hdr_len(bond->dev);
2663 pr_debug("bond_arp_rcv: bond %s skb->dev %s\n",
2664 bond->dev->name, skb->dev->name);
2666 if (alen > skb_headlen(skb)) {
2667 arp = kmalloc(alen, GFP_ATOMIC);
2670 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2674 if (arp->ar_hln != bond->dev->addr_len ||
2675 skb->pkt_type == PACKET_OTHERHOST ||
2676 skb->pkt_type == PACKET_LOOPBACK ||
2677 arp->ar_hrd != htons(ARPHRD_ETHER) ||
2678 arp->ar_pro != htons(ETH_P_IP) ||
2682 arp_ptr = (unsigned char *)(arp + 1);
2683 arp_ptr += bond->dev->addr_len;
2684 memcpy(&sip, arp_ptr, 4);
2685 arp_ptr += 4 + bond->dev->addr_len;
2686 memcpy(&tip, arp_ptr, 4);
2688 pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2689 bond->dev->name, slave->dev->name, bond_slave_state(slave),
2690 bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2694 * Backup slaves won't see the ARP reply, but do come through
2695 * here for each ARP probe (so we swap the sip/tip to validate
2696 * the probe). In a "redundant switch, common router" type of
2697 * configuration, the ARP probe will (hopefully) travel from
2698 * the active, through one switch, the router, then the other
2699 * switch before reaching the backup.
2701 if (bond_is_active_slave(slave))
2702 bond_validate_arp(bond, slave, sip, tip);
2704 bond_validate_arp(bond, slave, tip, sip);
2707 read_unlock(&bond->lock);
2708 if (arp != (struct arphdr *)skb->data)
2710 return RX_HANDLER_ANOTHER;
2714 * this function is called regularly to monitor each slave's link
2715 * ensuring that traffic is being sent and received when arp monitoring
2716 * is used in load-balancing mode. if the adapter has been dormant, then an
2717 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2718 * arp monitoring in active backup mode.
2720 void bond_loadbalance_arp_mon(struct work_struct *work)
2722 struct bonding *bond = container_of(work, struct bonding,
2724 struct slave *slave, *oldcurrent;
2725 int do_failover = 0;
2726 int delta_in_ticks, extra_ticks;
2729 read_lock(&bond->lock);
2731 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2732 extra_ticks = delta_in_ticks / 2;
2734 if (bond->slave_cnt == 0)
2737 read_lock(&bond->curr_slave_lock);
2738 oldcurrent = bond->curr_active_slave;
2739 read_unlock(&bond->curr_slave_lock);
2741 /* see if any of the previous devices are up now (i.e. they have
2742 * xmt and rcv traffic). the curr_active_slave does not come into
2743 * the picture unless it is null. also, slave->jiffies is not needed
2744 * here because we send an arp on each slave and give a slave as
2745 * long as it needs to get the tx/rx within the delta.
2746 * TODO: what about up/down delay in arp mode? it wasn't here before
2749 bond_for_each_slave(bond, slave, i) {
2750 unsigned long trans_start = dev_trans_start(slave->dev);
2752 if (slave->link != BOND_LINK_UP) {
2753 if (time_in_range(jiffies,
2754 trans_start - delta_in_ticks,
2755 trans_start + delta_in_ticks + extra_ticks) &&
2756 time_in_range(jiffies,
2757 slave->dev->last_rx - delta_in_ticks,
2758 slave->dev->last_rx + delta_in_ticks + extra_ticks)) {
2760 slave->link = BOND_LINK_UP;
2761 bond_set_active_slave(slave);
2763 /* primary_slave has no meaning in round-robin
2764 * mode. the window of a slave being up and
2765 * curr_active_slave being null after enslaving
2769 pr_info("%s: link status definitely up for interface %s, ",
2774 pr_info("%s: interface %s is now up\n",
2780 /* slave->link == BOND_LINK_UP */
2782 /* not all switches will respond to an arp request
2783 * when the source ip is 0, so don't take the link down
2784 * if we don't know our ip yet
2786 if (!time_in_range(jiffies,
2787 trans_start - delta_in_ticks,
2788 trans_start + 2 * delta_in_ticks + extra_ticks) ||
2789 !time_in_range(jiffies,
2790 slave->dev->last_rx - delta_in_ticks,
2791 slave->dev->last_rx + 2 * delta_in_ticks + extra_ticks)) {
2793 slave->link = BOND_LINK_DOWN;
2794 bond_set_backup_slave(slave);
2796 if (slave->link_failure_count < UINT_MAX)
2797 slave->link_failure_count++;
2799 pr_info("%s: interface %s is now down.\n",
2803 if (slave == oldcurrent)
2808 /* note: if switch is in round-robin mode, all links
2809 * must tx arp to ensure all links rx an arp - otherwise
2810 * links may oscillate or not come up at all; if switch is
2811 * in something like xor mode, there is nothing we can
2812 * do - all replies will be rx'ed on same link causing slaves
2813 * to be unstable during low/no traffic periods
2815 if (IS_UP(slave->dev))
2816 bond_arp_send_all(bond, slave);
2821 write_lock_bh(&bond->curr_slave_lock);
2823 bond_select_active_slave(bond);
2825 write_unlock_bh(&bond->curr_slave_lock);
2826 unblock_netpoll_tx();
2830 if (bond->params.arp_interval)
2831 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2833 read_unlock(&bond->lock);
2837 * Called to inspect slaves for active-backup mode ARP monitor link state
2838 * changes. Sets new_link in slaves to specify what action should take
2839 * place for the slave. Returns 0 if no changes are found, >0 if changes
2840 * to link states must be committed.
2842 * Called with bond->lock held for read.
2844 static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks)
2846 struct slave *slave;
2848 unsigned long trans_start;
2851 /* All the time comparisons below need some extra time. Otherwise, on
2852 * fast networks the ARP probe/reply may arrive within the same jiffy
2853 * as it was sent. Then, the next time the ARP monitor is run, one
2854 * arp_interval will already have passed in the comparisons.
2856 extra_ticks = delta_in_ticks / 2;
2858 bond_for_each_slave(bond, slave, i) {
2859 slave->new_link = BOND_LINK_NOCHANGE;
2861 if (slave->link != BOND_LINK_UP) {
2862 if (time_in_range(jiffies,
2863 slave_last_rx(bond, slave) - delta_in_ticks,
2864 slave_last_rx(bond, slave) + delta_in_ticks + extra_ticks)) {
2866 slave->new_link = BOND_LINK_UP;
2874 * Give slaves 2*delta after being enslaved or made
2875 * active. This avoids bouncing, as the last receive
2876 * times need a full ARP monitor cycle to be updated.
2878 if (time_in_range(jiffies,
2879 slave->jiffies - delta_in_ticks,
2880 slave->jiffies + 2 * delta_in_ticks + extra_ticks))
2884 * Backup slave is down if:
2885 * - No current_arp_slave AND
2886 * - more than 3*delta since last receive AND
2887 * - the bond has an IP address
2889 * Note: a non-null current_arp_slave indicates
2890 * the curr_active_slave went down and we are
2891 * searching for a new one; under this condition
2892 * we only take the curr_active_slave down - this
2893 * gives each slave a chance to tx/rx traffic
2894 * before being taken out
2896 if (!bond_is_active_slave(slave) &&
2897 !bond->current_arp_slave &&
2898 !time_in_range(jiffies,
2899 slave_last_rx(bond, slave) - delta_in_ticks,
2900 slave_last_rx(bond, slave) + 3 * delta_in_ticks + extra_ticks)) {
2902 slave->new_link = BOND_LINK_DOWN;
2907 * Active slave is down if:
2908 * - more than 2*delta since transmitting OR
2909 * - (more than 2*delta since receive AND
2910 * the bond has an IP address)
2912 trans_start = dev_trans_start(slave->dev);
2913 if (bond_is_active_slave(slave) &&
2914 (!time_in_range(jiffies,
2915 trans_start - delta_in_ticks,
2916 trans_start + 2 * delta_in_ticks + extra_ticks) ||
2917 !time_in_range(jiffies,
2918 slave_last_rx(bond, slave) - delta_in_ticks,
2919 slave_last_rx(bond, slave) + 2 * delta_in_ticks + extra_ticks))) {
2921 slave->new_link = BOND_LINK_DOWN;
2930 * Called to commit link state changes noted by inspection step of
2931 * active-backup mode ARP monitor.
2933 * Called with RTNL and bond->lock for read.
2935 static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks)
2937 struct slave *slave;
2939 unsigned long trans_start;
2941 bond_for_each_slave(bond, slave, i) {
2942 switch (slave->new_link) {
2943 case BOND_LINK_NOCHANGE:
2947 trans_start = dev_trans_start(slave->dev);
2948 if ((!bond->curr_active_slave &&
2949 time_in_range(jiffies,
2950 trans_start - delta_in_ticks,
2951 trans_start + delta_in_ticks + delta_in_ticks / 2)) ||
2952 bond->curr_active_slave != slave) {
2953 slave->link = BOND_LINK_UP;
2954 if (bond->current_arp_slave) {
2955 bond_set_slave_inactive_flags(
2956 bond->current_arp_slave);
2957 bond->current_arp_slave = NULL;
2960 pr_info("%s: link status definitely up for interface %s.\n",
2961 bond->dev->name, slave->dev->name);
2963 if (!bond->curr_active_slave ||
2964 (slave == bond->primary_slave))
2971 case BOND_LINK_DOWN:
2972 if (slave->link_failure_count < UINT_MAX)
2973 slave->link_failure_count++;
2975 slave->link = BOND_LINK_DOWN;
2976 bond_set_slave_inactive_flags(slave);
2978 pr_info("%s: link status definitely down for interface %s, disabling it\n",
2979 bond->dev->name, slave->dev->name);
2981 if (slave == bond->curr_active_slave) {
2982 bond->current_arp_slave = NULL;
2989 pr_err("%s: impossible: new_link %d on slave %s\n",
2990 bond->dev->name, slave->new_link,
2998 write_lock_bh(&bond->curr_slave_lock);
2999 bond_select_active_slave(bond);
3000 write_unlock_bh(&bond->curr_slave_lock);
3001 unblock_netpoll_tx();
3004 bond_set_carrier(bond);
3008 * Send ARP probes for active-backup mode ARP monitor.
3010 * Called with bond->lock held for read.
3012 static void bond_ab_arp_probe(struct bonding *bond)
3014 struct slave *slave;
3017 read_lock(&bond->curr_slave_lock);
3019 if (bond->current_arp_slave && bond->curr_active_slave)
3020 pr_info("PROBE: c_arp %s && cas %s BAD\n",
3021 bond->current_arp_slave->dev->name,
3022 bond->curr_active_slave->dev->name);
3024 if (bond->curr_active_slave) {
3025 bond_arp_send_all(bond, bond->curr_active_slave);
3026 read_unlock(&bond->curr_slave_lock);
3030 read_unlock(&bond->curr_slave_lock);
3032 /* if we don't have a curr_active_slave, search for the next available
3033 * backup slave from the current_arp_slave and make it the candidate
3034 * for becoming the curr_active_slave
3037 if (!bond->current_arp_slave) {
3038 bond->current_arp_slave = bond->first_slave;
3039 if (!bond->current_arp_slave)
3043 bond_set_slave_inactive_flags(bond->current_arp_slave);
3045 /* search for next candidate */
3046 bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
3047 if (IS_UP(slave->dev)) {
3048 slave->link = BOND_LINK_BACK;
3049 bond_set_slave_active_flags(slave);
3050 bond_arp_send_all(bond, slave);
3051 slave->jiffies = jiffies;
3052 bond->current_arp_slave = slave;
3056 /* if the link state is up at this point, we
3057 * mark it down - this can happen if we have
3058 * simultaneous link failures and
3059 * reselect_active_interface doesn't make this
3060 * one the current slave so it is still marked
3061 * up when it is actually down
3063 if (slave->link == BOND_LINK_UP) {
3064 slave->link = BOND_LINK_DOWN;
3065 if (slave->link_failure_count < UINT_MAX)
3066 slave->link_failure_count++;
3068 bond_set_slave_inactive_flags(slave);
3070 pr_info("%s: backup interface %s is now down.\n",
3071 bond->dev->name, slave->dev->name);
3076 void bond_activebackup_arp_mon(struct work_struct *work)
3078 struct bonding *bond = container_of(work, struct bonding,
3080 bool should_notify_peers = false;
3083 read_lock(&bond->lock);
3085 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3087 if (bond->slave_cnt == 0)
3090 should_notify_peers = bond_should_notify_peers(bond);
3092 if (bond_ab_arp_inspect(bond, delta_in_ticks)) {
3093 read_unlock(&bond->lock);
3095 /* Race avoidance with bond_close flush of workqueue */
3096 if (!rtnl_trylock()) {
3097 read_lock(&bond->lock);
3099 should_notify_peers = false;
3103 read_lock(&bond->lock);
3105 bond_ab_arp_commit(bond, delta_in_ticks);
3107 read_unlock(&bond->lock);
3109 read_lock(&bond->lock);
3112 bond_ab_arp_probe(bond);
3115 if (bond->params.arp_interval)
3116 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3118 read_unlock(&bond->lock);
3120 if (should_notify_peers) {
3121 if (!rtnl_trylock()) {
3122 read_lock(&bond->lock);
3123 bond->send_peer_notif++;
3124 read_unlock(&bond->lock);
3127 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
3132 /*-------------------------- netdev event handling --------------------------*/
3135 * Change device name
3137 static int bond_event_changename(struct bonding *bond)
3139 bond_remove_proc_entry(bond);
3140 bond_create_proc_entry(bond);
3142 bond_debug_reregister(bond);
3147 static int bond_master_netdev_event(unsigned long event,
3148 struct net_device *bond_dev)
3150 struct bonding *event_bond = netdev_priv(bond_dev);
3153 case NETDEV_CHANGENAME:
3154 return bond_event_changename(event_bond);
3155 case NETDEV_UNREGISTER:
3156 bond_remove_proc_entry(event_bond);
3158 case NETDEV_REGISTER:
3159 bond_create_proc_entry(event_bond);
3168 static int bond_slave_netdev_event(unsigned long event,
3169 struct net_device *slave_dev)
3171 struct slave *slave = bond_slave_get_rtnl(slave_dev);
3172 struct bonding *bond = slave->bond;
3173 struct net_device *bond_dev = slave->bond->dev;
3178 case NETDEV_UNREGISTER:
3179 if (bond->setup_by_slave)
3180 bond_release_and_destroy(bond_dev, slave_dev);
3182 bond_release(bond_dev, slave_dev);
3186 old_speed = slave->speed;
3187 old_duplex = slave->duplex;
3189 bond_update_speed_duplex(slave);
3191 if (bond->params.mode == BOND_MODE_8023AD) {
3192 if (old_speed != slave->speed)
3193 bond_3ad_adapter_speed_changed(slave);
3194 if (old_duplex != slave->duplex)
3195 bond_3ad_adapter_duplex_changed(slave);
3200 * ... Or is it this?
3203 case NETDEV_CHANGEMTU:
3205 * TODO: Should slaves be allowed to
3206 * independently alter their MTU? For
3207 * an active-backup bond, slaves need
3208 * not be the same type of device, so
3209 * MTUs may vary. For other modes,
3210 * slaves arguably should have the
3211 * same MTUs. To do this, we'd need to
3212 * take over the slave's change_mtu
3213 * function for the duration of their
3217 case NETDEV_CHANGENAME:
3219 * TODO: handle changing the primary's name
3222 case NETDEV_FEAT_CHANGE:
3223 bond_compute_features(bond);
3233 * bond_netdev_event: handle netdev notifier chain events.
3235 * This function receives events for the netdev chain. The caller (an
3236 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3237 * locks for us to safely manipulate the slave devices (RTNL lock,
3240 static int bond_netdev_event(struct notifier_block *this,
3241 unsigned long event, void *ptr)
3243 struct net_device *event_dev = (struct net_device *)ptr;
3245 pr_debug("event_dev: %s, event: %lx\n",
3246 event_dev ? event_dev->name : "None",
3249 if (!(event_dev->priv_flags & IFF_BONDING))
3252 if (event_dev->flags & IFF_MASTER) {
3253 pr_debug("IFF_MASTER\n");
3254 return bond_master_netdev_event(event, event_dev);
3257 if (event_dev->flags & IFF_SLAVE) {
3258 pr_debug("IFF_SLAVE\n");
3259 return bond_slave_netdev_event(event, event_dev);
3265 static struct notifier_block bond_netdev_notifier = {
3266 .notifier_call = bond_netdev_event,
3269 /*---------------------------- Hashing Policies -----------------------------*/
3272 * Hash for the output device based upon layer 2 data
3274 static int bond_xmit_hash_policy_l2(struct sk_buff *skb, int count)
3276 struct ethhdr *data = (struct ethhdr *)skb->data;
3278 if (skb_headlen(skb) >= offsetof(struct ethhdr, h_proto))
3279 return (data->h_dest[5] ^ data->h_source[5]) % count;
3285 * Hash for the output device based upon layer 2 and layer 3 data. If
3286 * the packet is not IP, fall back on bond_xmit_hash_policy_l2()
3288 static int bond_xmit_hash_policy_l23(struct sk_buff *skb, int count)
3290 struct ethhdr *data = (struct ethhdr *)skb->data;
3292 struct ipv6hdr *ipv6h;
3296 if (skb->protocol == htons(ETH_P_IP) &&
3297 skb_network_header_len(skb) >= sizeof(*iph)) {
3299 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^
3300 (data->h_dest[5] ^ data->h_source[5])) % count;
3301 } else if (skb->protocol == htons(ETH_P_IPV6) &&
3302 skb_network_header_len(skb) >= sizeof(*ipv6h)) {
3303 ipv6h = ipv6_hdr(skb);
3304 s = &ipv6h->saddr.s6_addr32[0];
3305 d = &ipv6h->daddr.s6_addr32[0];
3306 v6hash = (s[1] ^ d[1]) ^ (s[2] ^ d[2]) ^ (s[3] ^ d[3]);
3307 v6hash ^= (v6hash >> 24) ^ (v6hash >> 16) ^ (v6hash >> 8);
3308 return (v6hash ^ data->h_dest[5] ^ data->h_source[5]) % count;
3311 return bond_xmit_hash_policy_l2(skb, count);
3315 * Hash for the output device based upon layer 3 and layer 4 data. If
3316 * the packet is a frag or not TCP or UDP, just use layer 3 data. If it is
3317 * altogether not IP, fall back on bond_xmit_hash_policy_l2()
3319 static int bond_xmit_hash_policy_l34(struct sk_buff *skb, int count)
3323 struct ipv6hdr *ipv6h;
3327 if (skb->protocol == htons(ETH_P_IP) &&
3328 skb_network_header_len(skb) >= sizeof(*iph)) {
3330 if (!ip_is_fragment(iph) &&
3331 (iph->protocol == IPPROTO_TCP ||
3332 iph->protocol == IPPROTO_UDP) &&
3333 (skb_headlen(skb) - skb_network_offset(skb) >=
3334 iph->ihl * sizeof(u32) + sizeof(*layer4hdr) * 2)) {
3335 layer4hdr = (__be16 *)((u32 *)iph + iph->ihl);
3336 layer4_xor = ntohs(*layer4hdr ^ *(layer4hdr + 1));
3338 return (layer4_xor ^
3339 ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3340 } else if (skb->protocol == htons(ETH_P_IPV6) &&
3341 skb_network_header_len(skb) >= sizeof(*ipv6h)) {
3342 ipv6h = ipv6_hdr(skb);
3343 if ((ipv6h->nexthdr == IPPROTO_TCP ||
3344 ipv6h->nexthdr == IPPROTO_UDP) &&
3345 (skb_headlen(skb) - skb_network_offset(skb) >=
3346 sizeof(*ipv6h) + sizeof(*layer4hdr) * 2)) {
3347 layer4hdr = (__be16 *)(ipv6h + 1);
3348 layer4_xor = ntohs(*layer4hdr ^ *(layer4hdr + 1));
3350 s = &ipv6h->saddr.s6_addr32[0];
3351 d = &ipv6h->daddr.s6_addr32[0];
3352 layer4_xor ^= (s[1] ^ d[1]) ^ (s[2] ^ d[2]) ^ (s[3] ^ d[3]);
3353 layer4_xor ^= (layer4_xor >> 24) ^ (layer4_xor >> 16) ^
3355 return layer4_xor % count;
3358 return bond_xmit_hash_policy_l2(skb, count);
3361 /*-------------------------- Device entry points ----------------------------*/
3363 static void bond_work_init_all(struct bonding *bond)
3365 INIT_DELAYED_WORK(&bond->mcast_work,
3366 bond_resend_igmp_join_requests_delayed);
3367 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3368 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3369 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3370 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon);
3372 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon);
3373 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3376 static void bond_work_cancel_all(struct bonding *bond)
3378 cancel_delayed_work_sync(&bond->mii_work);
3379 cancel_delayed_work_sync(&bond->arp_work);
3380 cancel_delayed_work_sync(&bond->alb_work);
3381 cancel_delayed_work_sync(&bond->ad_work);
3382 cancel_delayed_work_sync(&bond->mcast_work);
3385 static int bond_open(struct net_device *bond_dev)
3387 struct bonding *bond = netdev_priv(bond_dev);
3388 struct slave *slave;
3391 /* reset slave->backup and slave->inactive */
3392 read_lock(&bond->lock);
3393 if (bond->slave_cnt > 0) {
3394 read_lock(&bond->curr_slave_lock);
3395 bond_for_each_slave(bond, slave, i) {
3396 if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3397 && (slave != bond->curr_active_slave)) {
3398 bond_set_slave_inactive_flags(slave);
3400 bond_set_slave_active_flags(slave);
3403 read_unlock(&bond->curr_slave_lock);
3405 read_unlock(&bond->lock);
3407 bond_work_init_all(bond);
3409 if (bond_is_lb(bond)) {
3410 /* bond_alb_initialize must be called before the timer
3413 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB)))
3415 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3418 if (bond->params.miimon) /* link check interval, in milliseconds. */
3419 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3421 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3422 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3423 if (bond->params.arp_validate)
3424 bond->recv_probe = bond_arp_rcv;
3427 if (bond->params.mode == BOND_MODE_8023AD) {
3428 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3429 /* register to receive LACPDUs */
3430 bond->recv_probe = bond_3ad_lacpdu_recv;
3431 bond_3ad_initiate_agg_selection(bond, 1);
3437 static int bond_close(struct net_device *bond_dev)
3439 struct bonding *bond = netdev_priv(bond_dev);
3441 write_lock_bh(&bond->lock);
3442 bond->send_peer_notif = 0;
3443 write_unlock_bh(&bond->lock);
3445 bond_work_cancel_all(bond);
3446 if (bond_is_lb(bond)) {
3447 /* Must be called only after all
3448 * slaves have been released
3450 bond_alb_deinitialize(bond);
3452 bond->recv_probe = NULL;
3457 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3458 struct rtnl_link_stats64 *stats)
3460 struct bonding *bond = netdev_priv(bond_dev);
3461 struct rtnl_link_stats64 temp;
3462 struct slave *slave;
3465 memset(stats, 0, sizeof(*stats));
3467 read_lock_bh(&bond->lock);
3469 bond_for_each_slave(bond, slave, i) {
3470 const struct rtnl_link_stats64 *sstats =
3471 dev_get_stats(slave->dev, &temp);
3473 stats->rx_packets += sstats->rx_packets;
3474 stats->rx_bytes += sstats->rx_bytes;
3475 stats->rx_errors += sstats->rx_errors;
3476 stats->rx_dropped += sstats->rx_dropped;
3478 stats->tx_packets += sstats->tx_packets;
3479 stats->tx_bytes += sstats->tx_bytes;
3480 stats->tx_errors += sstats->tx_errors;
3481 stats->tx_dropped += sstats->tx_dropped;
3483 stats->multicast += sstats->multicast;
3484 stats->collisions += sstats->collisions;
3486 stats->rx_length_errors += sstats->rx_length_errors;
3487 stats->rx_over_errors += sstats->rx_over_errors;
3488 stats->rx_crc_errors += sstats->rx_crc_errors;
3489 stats->rx_frame_errors += sstats->rx_frame_errors;
3490 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3491 stats->rx_missed_errors += sstats->rx_missed_errors;
3493 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3494 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3495 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3496 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3497 stats->tx_window_errors += sstats->tx_window_errors;
3500 read_unlock_bh(&bond->lock);
3505 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3507 struct net_device *slave_dev = NULL;
3508 struct ifbond k_binfo;
3509 struct ifbond __user *u_binfo = NULL;
3510 struct ifslave k_sinfo;
3511 struct ifslave __user *u_sinfo = NULL;
3512 struct mii_ioctl_data *mii = NULL;
3516 pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd);
3528 * We do this again just in case we were called by SIOCGMIIREG
3529 * instead of SIOCGMIIPHY.
3536 if (mii->reg_num == 1) {
3537 struct bonding *bond = netdev_priv(bond_dev);
3539 read_lock(&bond->lock);
3540 read_lock(&bond->curr_slave_lock);
3541 if (netif_carrier_ok(bond->dev))
3542 mii->val_out = BMSR_LSTATUS;
3544 read_unlock(&bond->curr_slave_lock);
3545 read_unlock(&bond->lock);
3549 case BOND_INFO_QUERY_OLD:
3550 case SIOCBONDINFOQUERY:
3551 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3553 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3556 res = bond_info_query(bond_dev, &k_binfo);
3558 copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3562 case BOND_SLAVE_INFO_QUERY_OLD:
3563 case SIOCBONDSLAVEINFOQUERY:
3564 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3566 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3569 res = bond_slave_info_query(bond_dev, &k_sinfo);
3571 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3580 net = dev_net(bond_dev);
3582 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3585 slave_dev = dev_get_by_name(net, ifr->ifr_slave);
3587 pr_debug("slave_dev=%p:\n", slave_dev);
3592 pr_debug("slave_dev->name=%s:\n", slave_dev->name);
3594 case BOND_ENSLAVE_OLD:
3595 case SIOCBONDENSLAVE:
3596 res = bond_enslave(bond_dev, slave_dev);
3598 case BOND_RELEASE_OLD:
3599 case SIOCBONDRELEASE:
3600 res = bond_release(bond_dev, slave_dev);
3602 case BOND_SETHWADDR_OLD:
3603 case SIOCBONDSETHWADDR:
3604 bond_set_dev_addr(bond_dev, slave_dev);
3607 case BOND_CHANGE_ACTIVE_OLD:
3608 case SIOCBONDCHANGEACTIVE:
3609 res = bond_ioctl_change_active(bond_dev, slave_dev);
3621 static bool bond_addr_in_mc_list(unsigned char *addr,
3622 struct netdev_hw_addr_list *list,
3625 struct netdev_hw_addr *ha;
3627 netdev_hw_addr_list_for_each(ha, list)
3628 if (!memcmp(ha->addr, addr, addrlen))
3634 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3636 struct bonding *bond = netdev_priv(bond_dev);
3638 if (change & IFF_PROMISC)
3639 bond_set_promiscuity(bond,
3640 bond_dev->flags & IFF_PROMISC ? 1 : -1);
3642 if (change & IFF_ALLMULTI)
3643 bond_set_allmulti(bond,
3644 bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3647 static void bond_set_multicast_list(struct net_device *bond_dev)
3649 struct bonding *bond = netdev_priv(bond_dev);
3650 struct netdev_hw_addr *ha;
3653 read_lock(&bond->lock);
3655 /* looking for addresses to add to slaves' mc list */
3656 netdev_for_each_mc_addr(ha, bond_dev) {
3657 found = bond_addr_in_mc_list(ha->addr, &bond->mc_list,
3658 bond_dev->addr_len);
3660 bond_mc_add(bond, ha->addr);
3663 /* looking for addresses to delete from slaves' list */
3664 netdev_hw_addr_list_for_each(ha, &bond->mc_list) {
3665 found = bond_addr_in_mc_list(ha->addr, &bond_dev->mc,
3666 bond_dev->addr_len);
3668 bond_mc_del(bond, ha->addr);
3671 /* save master's multicast list */
3672 __hw_addr_flush(&bond->mc_list);
3673 __hw_addr_add_multiple(&bond->mc_list, &bond_dev->mc,
3674 bond_dev->addr_len, NETDEV_HW_ADDR_T_MULTICAST);
3676 read_unlock(&bond->lock);
3679 static int bond_neigh_init(struct neighbour *n)
3681 struct bonding *bond = netdev_priv(n->dev);
3682 struct slave *slave = bond->first_slave;
3683 const struct net_device_ops *slave_ops;
3684 struct neigh_parms parms;
3690 slave_ops = slave->dev->netdev_ops;
3692 if (!slave_ops->ndo_neigh_setup)
3695 parms.neigh_setup = NULL;
3696 parms.neigh_cleanup = NULL;
3697 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3702 * Assign slave's neigh_cleanup to neighbour in case cleanup is called
3703 * after the last slave has been detached. Assumes that all slaves
3704 * utilize the same neigh_cleanup (true at this writing as only user
3707 n->parms->neigh_cleanup = parms.neigh_cleanup;
3709 if (!parms.neigh_setup)
3712 return parms.neigh_setup(n);
3716 * The bonding ndo_neigh_setup is called at init time beofre any
3717 * slave exists. So we must declare proxy setup function which will
3718 * be used at run time to resolve the actual slave neigh param setup.
3720 static int bond_neigh_setup(struct net_device *dev,
3721 struct neigh_parms *parms)
3723 parms->neigh_setup = bond_neigh_init;
3729 * Change the MTU of all of a master's slaves to match the master
3731 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3733 struct bonding *bond = netdev_priv(bond_dev);
3734 struct slave *slave, *stop_at;
3738 pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond,
3739 (bond_dev ? bond_dev->name : "None"), new_mtu);
3741 /* Can't hold bond->lock with bh disabled here since
3742 * some base drivers panic. On the other hand we can't
3743 * hold bond->lock without bh disabled because we'll
3744 * deadlock. The only solution is to rely on the fact
3745 * that we're under rtnl_lock here, and the slaves
3746 * list won't change. This doesn't solve the problem
3747 * of setting the slave's MTU while it is
3748 * transmitting, but the assumption is that the base
3749 * driver can handle that.
3751 * TODO: figure out a way to safely iterate the slaves
3752 * list, but without holding a lock around the actual
3753 * call to the base driver.
3756 bond_for_each_slave(bond, slave, i) {
3757 pr_debug("s %p s->p %p c_m %p\n",
3760 slave->dev->netdev_ops->ndo_change_mtu);
3762 res = dev_set_mtu(slave->dev, new_mtu);
3765 /* If we failed to set the slave's mtu to the new value
3766 * we must abort the operation even in ACTIVE_BACKUP
3767 * mode, because if we allow the backup slaves to have
3768 * different mtu values than the active slave we'll
3769 * need to change their mtu when doing a failover. That
3770 * means changing their mtu from timer context, which
3771 * is probably not a good idea.
3773 pr_debug("err %d %s\n", res, slave->dev->name);
3778 bond_dev->mtu = new_mtu;
3783 /* unwind from head to the slave that failed */
3785 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3788 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
3790 pr_debug("unwind err %d dev %s\n",
3791 tmp_res, slave->dev->name);
3801 * Note that many devices must be down to change the HW address, and
3802 * downing the master releases all slaves. We can make bonds full of
3803 * bonding devices to test this, however.
3805 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3807 struct bonding *bond = netdev_priv(bond_dev);
3808 struct sockaddr *sa = addr, tmp_sa;
3809 struct slave *slave, *stop_at;
3813 if (bond->params.mode == BOND_MODE_ALB)
3814 return bond_alb_set_mac_address(bond_dev, addr);
3817 pr_debug("bond=%p, name=%s\n",
3818 bond, bond_dev ? bond_dev->name : "None");
3821 * If fail_over_mac is set to active, do nothing and return
3822 * success. Returning an error causes ifenslave to fail.
3824 if (bond->params.fail_over_mac == BOND_FOM_ACTIVE)
3827 if (!is_valid_ether_addr(sa->sa_data))
3828 return -EADDRNOTAVAIL;
3830 /* Can't hold bond->lock with bh disabled here since
3831 * some base drivers panic. On the other hand we can't
3832 * hold bond->lock without bh disabled because we'll
3833 * deadlock. The only solution is to rely on the fact
3834 * that we're under rtnl_lock here, and the slaves
3835 * list won't change. This doesn't solve the problem
3836 * of setting the slave's hw address while it is
3837 * transmitting, but the assumption is that the base
3838 * driver can handle that.
3840 * TODO: figure out a way to safely iterate the slaves
3841 * list, but without holding a lock around the actual
3842 * call to the base driver.
3845 bond_for_each_slave(bond, slave, i) {
3846 const struct net_device_ops *slave_ops = slave->dev->netdev_ops;
3847 pr_debug("slave %p %s\n", slave, slave->dev->name);
3849 if (slave_ops->ndo_set_mac_address == NULL) {
3851 pr_debug("EOPNOTSUPP %s\n", slave->dev->name);
3855 res = dev_set_mac_address(slave->dev, addr);
3857 /* TODO: consider downing the slave
3859 * User should expect communications
3860 * breakage anyway until ARP finish
3863 pr_debug("err %d %s\n", res, slave->dev->name);
3869 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3873 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3874 tmp_sa.sa_family = bond_dev->type;
3876 /* unwind from head to the slave that failed */
3878 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3881 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
3883 pr_debug("unwind err %d dev %s\n",
3884 tmp_res, slave->dev->name);
3891 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3893 struct bonding *bond = netdev_priv(bond_dev);
3894 struct slave *slave, *start_at;
3895 int i, slave_no, res = 1;
3896 struct iphdr *iph = ip_hdr(skb);
3899 * Start with the curr_active_slave that joined the bond as the
3900 * default for sending IGMP traffic. For failover purposes one
3901 * needs to maintain some consistency for the interface that will
3902 * send the join/membership reports. The curr_active_slave found
3903 * will send all of this type of traffic.
3905 if ((iph->protocol == IPPROTO_IGMP) &&
3906 (skb->protocol == htons(ETH_P_IP))) {
3908 read_lock(&bond->curr_slave_lock);
3909 slave = bond->curr_active_slave;
3910 read_unlock(&bond->curr_slave_lock);
3916 * Concurrent TX may collide on rr_tx_counter; we accept
3917 * that as being rare enough not to justify using an
3920 slave_no = bond->rr_tx_counter++ % bond->slave_cnt;
3922 bond_for_each_slave(bond, slave, i) {
3930 bond_for_each_slave_from(bond, slave, i, start_at) {
3931 if (IS_UP(slave->dev) &&
3932 (slave->link == BOND_LINK_UP) &&
3933 bond_is_active_slave(slave)) {
3934 res = bond_dev_queue_xmit(bond, skb, slave->dev);
3941 /* no suitable interface, frame not sent */
3945 return NETDEV_TX_OK;
3950 * in active-backup mode, we know that bond->curr_active_slave is always valid if
3951 * the bond has a usable interface.
3953 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3955 struct bonding *bond = netdev_priv(bond_dev);
3958 read_lock(&bond->curr_slave_lock);
3960 if (bond->curr_active_slave)
3961 res = bond_dev_queue_xmit(bond, skb,
3962 bond->curr_active_slave->dev);
3964 read_unlock(&bond->curr_slave_lock);
3967 /* no suitable interface, frame not sent */
3970 return NETDEV_TX_OK;
3974 * In bond_xmit_xor() , we determine the output device by using a pre-
3975 * determined xmit_hash_policy(), If the selected device is not enabled,
3976 * find the next active slave.
3978 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
3980 struct bonding *bond = netdev_priv(bond_dev);
3981 struct slave *slave, *start_at;
3986 slave_no = bond->xmit_hash_policy(skb, bond->slave_cnt);
3988 bond_for_each_slave(bond, slave, i) {
3996 bond_for_each_slave_from(bond, slave, i, start_at) {
3997 if (IS_UP(slave->dev) &&
3998 (slave->link == BOND_LINK_UP) &&
3999 bond_is_active_slave(slave)) {
4000 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4006 /* no suitable interface, frame not sent */
4010 return NETDEV_TX_OK;
4014 * in broadcast mode, we send everything to all usable interfaces.
4016 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4018 struct bonding *bond = netdev_priv(bond_dev);
4019 struct slave *slave, *start_at;
4020 struct net_device *tx_dev = NULL;
4024 read_lock(&bond->curr_slave_lock);
4025 start_at = bond->curr_active_slave;
4026 read_unlock(&bond->curr_slave_lock);
4031 bond_for_each_slave_from(bond, slave, i, start_at) {
4032 if (IS_UP(slave->dev) &&
4033 (slave->link == BOND_LINK_UP) &&
4034 bond_is_active_slave(slave)) {
4036 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4038 pr_err("%s: Error: bond_xmit_broadcast(): skb_clone() failed\n",
4043 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4049 tx_dev = slave->dev;
4054 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4058 /* no suitable interface, frame not sent */
4061 /* frame sent to all suitable interfaces */
4062 return NETDEV_TX_OK;
4065 /*------------------------- Device initialization ---------------------------*/
4067 static void bond_set_xmit_hash_policy(struct bonding *bond)
4069 switch (bond->params.xmit_policy) {
4070 case BOND_XMIT_POLICY_LAYER23:
4071 bond->xmit_hash_policy = bond_xmit_hash_policy_l23;
4073 case BOND_XMIT_POLICY_LAYER34:
4074 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4076 case BOND_XMIT_POLICY_LAYER2:
4078 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4084 * Lookup the slave that corresponds to a qid
4086 static inline int bond_slave_override(struct bonding *bond,
4087 struct sk_buff *skb)
4090 struct slave *slave = NULL;
4091 struct slave *check_slave;
4093 if (!skb->queue_mapping)
4096 /* Find out if any slaves have the same mapping as this skb. */
4097 bond_for_each_slave(bond, check_slave, i) {
4098 if (check_slave->queue_id == skb->queue_mapping) {
4099 slave = check_slave;
4104 /* If the slave isn't UP, use default transmit policy. */
4105 if (slave && slave->queue_id && IS_UP(slave->dev) &&
4106 (slave->link == BOND_LINK_UP)) {
4107 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4114 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb)
4117 * This helper function exists to help dev_pick_tx get the correct
4118 * destination queue. Using a helper function skips a call to
4119 * skb_tx_hash and will put the skbs in the queue we expect on their
4120 * way down to the bonding driver.
4122 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
4125 * Save the original txq to restore before passing to the driver
4127 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
4129 if (unlikely(txq >= dev->real_num_tx_queues)) {
4131 txq -= dev->real_num_tx_queues;
4132 } while (txq >= dev->real_num_tx_queues);
4137 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4139 struct bonding *bond = netdev_priv(dev);
4141 if (TX_QUEUE_OVERRIDE(bond->params.mode)) {
4142 if (!bond_slave_override(bond, skb))
4143 return NETDEV_TX_OK;
4146 switch (bond->params.mode) {
4147 case BOND_MODE_ROUNDROBIN:
4148 return bond_xmit_roundrobin(skb, dev);
4149 case BOND_MODE_ACTIVEBACKUP:
4150 return bond_xmit_activebackup(skb, dev);
4152 return bond_xmit_xor(skb, dev);
4153 case BOND_MODE_BROADCAST:
4154 return bond_xmit_broadcast(skb, dev);
4155 case BOND_MODE_8023AD:
4156 return bond_3ad_xmit_xor(skb, dev);
4159 return bond_alb_xmit(skb, dev);
4161 /* Should never happen, mode already checked */
4162 pr_err("%s: Error: Unknown bonding mode %d\n",
4163 dev->name, bond->params.mode);
4166 return NETDEV_TX_OK;
4170 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4172 struct bonding *bond = netdev_priv(dev);
4173 netdev_tx_t ret = NETDEV_TX_OK;
4176 * If we risk deadlock from transmitting this in the
4177 * netpoll path, tell netpoll to queue the frame for later tx
4179 if (is_netpoll_tx_blocked(dev))
4180 return NETDEV_TX_BUSY;
4182 read_lock(&bond->lock);
4184 if (bond->slave_cnt)
4185 ret = __bond_start_xmit(skb, dev);
4189 read_unlock(&bond->lock);
4195 * set bond mode specific net device operations
4197 void bond_set_mode_ops(struct bonding *bond, int mode)
4199 struct net_device *bond_dev = bond->dev;
4202 case BOND_MODE_ROUNDROBIN:
4204 case BOND_MODE_ACTIVEBACKUP:
4207 bond_set_xmit_hash_policy(bond);
4209 case BOND_MODE_BROADCAST:
4211 case BOND_MODE_8023AD:
4212 bond_set_xmit_hash_policy(bond);
4219 /* Should never happen, mode already checked */
4220 pr_err("%s: Error: Unknown bonding mode %d\n",
4221 bond_dev->name, mode);
4226 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4227 struct ethtool_drvinfo *drvinfo)
4229 strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
4230 strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
4231 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
4235 static const struct ethtool_ops bond_ethtool_ops = {
4236 .get_drvinfo = bond_ethtool_get_drvinfo,
4237 .get_link = ethtool_op_get_link,
4240 static const struct net_device_ops bond_netdev_ops = {
4241 .ndo_init = bond_init,
4242 .ndo_uninit = bond_uninit,
4243 .ndo_open = bond_open,
4244 .ndo_stop = bond_close,
4245 .ndo_start_xmit = bond_start_xmit,
4246 .ndo_select_queue = bond_select_queue,
4247 .ndo_get_stats64 = bond_get_stats,
4248 .ndo_do_ioctl = bond_do_ioctl,
4249 .ndo_change_rx_flags = bond_change_rx_flags,
4250 .ndo_set_rx_mode = bond_set_multicast_list,
4251 .ndo_change_mtu = bond_change_mtu,
4252 .ndo_set_mac_address = bond_set_mac_address,
4253 .ndo_neigh_setup = bond_neigh_setup,
4254 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid,
4255 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid,
4256 #ifdef CONFIG_NET_POLL_CONTROLLER
4257 .ndo_netpoll_setup = bond_netpoll_setup,
4258 .ndo_netpoll_cleanup = bond_netpoll_cleanup,
4259 .ndo_poll_controller = bond_poll_controller,
4261 .ndo_add_slave = bond_enslave,
4262 .ndo_del_slave = bond_release,
4263 .ndo_fix_features = bond_fix_features,
4266 static const struct device_type bond_type = {
4270 static void bond_destructor(struct net_device *bond_dev)
4272 struct bonding *bond = netdev_priv(bond_dev);
4274 destroy_workqueue(bond->wq);
4275 free_netdev(bond_dev);
4278 static void bond_setup(struct net_device *bond_dev)
4280 struct bonding *bond = netdev_priv(bond_dev);
4282 /* initialize rwlocks */
4283 rwlock_init(&bond->lock);
4284 rwlock_init(&bond->curr_slave_lock);
4286 bond->params = bonding_defaults;
4288 /* Initialize pointers */
4289 bond->dev = bond_dev;
4290 INIT_LIST_HEAD(&bond->vlan_list);
4292 /* Initialize the device entry points */
4293 ether_setup(bond_dev);
4294 bond_dev->netdev_ops = &bond_netdev_ops;
4295 bond_dev->ethtool_ops = &bond_ethtool_ops;
4296 bond_set_mode_ops(bond, bond->params.mode);
4298 bond_dev->destructor = bond_destructor;
4300 SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
4302 /* Initialize the device options */
4303 bond_dev->tx_queue_len = 0;
4304 bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4305 bond_dev->priv_flags |= IFF_BONDING;
4306 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4308 /* At first, we block adding VLANs. That's the only way to
4309 * prevent problems that occur when adding VLANs over an
4310 * empty bond. The block will be removed once non-challenged
4311 * slaves are enslaved.
4313 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4315 /* don't acquire bond device's netif_tx_lock when
4317 bond_dev->features |= NETIF_F_LLTX;
4319 /* By default, we declare the bond to be fully
4320 * VLAN hardware accelerated capable. Special
4321 * care is taken in the various xmit functions
4322 * when there are slaves that are not hw accel
4326 bond_dev->hw_features = BOND_VLAN_FEATURES |
4327 NETIF_F_HW_VLAN_TX |
4328 NETIF_F_HW_VLAN_RX |
4329 NETIF_F_HW_VLAN_FILTER;
4331 bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM);
4332 bond_dev->features |= bond_dev->hw_features;
4336 * Destroy a bonding device.
4337 * Must be under rtnl_lock when this function is called.
4339 static void bond_uninit(struct net_device *bond_dev)
4341 struct bonding *bond = netdev_priv(bond_dev);
4342 struct vlan_entry *vlan, *tmp;
4344 bond_netpoll_cleanup(bond_dev);
4346 /* Release the bonded slaves */
4347 while (bond->first_slave != NULL)
4348 __bond_release_one(bond_dev, bond->first_slave->dev, true);
4349 pr_info("%s: released all slaves\n", bond_dev->name);
4351 list_del(&bond->bond_list);
4353 bond_debug_unregister(bond);
4355 __hw_addr_flush(&bond->mc_list);
4357 list_for_each_entry_safe(vlan, tmp, &bond->vlan_list, vlan_list) {
4358 list_del(&vlan->vlan_list);
4363 /*------------------------- Module initialization ---------------------------*/
4366 * Convert string input module parms. Accept either the
4367 * number of the mode or its string name. A bit complicated because
4368 * some mode names are substrings of other names, and calls from sysfs
4369 * may have whitespace in the name (trailing newlines, for example).
4371 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl)
4373 int modeint = -1, i, rv;
4374 char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, };
4376 for (p = (char *)buf; *p; p++)
4377 if (!(isdigit(*p) || isspace(*p)))
4381 rv = sscanf(buf, "%20s", modestr);
4383 rv = sscanf(buf, "%d", &modeint);
4388 for (i = 0; tbl[i].modename; i++) {
4389 if (modeint == tbl[i].mode)
4391 if (strcmp(modestr, tbl[i].modename) == 0)
4398 static int bond_check_params(struct bond_params *params)
4400 int arp_validate_value, fail_over_mac_value, primary_reselect_value;
4403 * Convert string parameters.
4406 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4407 if (bond_mode == -1) {
4408 pr_err("Error: Invalid bonding mode \"%s\"\n",
4409 mode == NULL ? "NULL" : mode);
4414 if (xmit_hash_policy) {
4415 if ((bond_mode != BOND_MODE_XOR) &&
4416 (bond_mode != BOND_MODE_8023AD)) {
4417 pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4418 bond_mode_name(bond_mode));
4420 xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4422 if (xmit_hashtype == -1) {
4423 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4424 xmit_hash_policy == NULL ? "NULL" :
4432 if (bond_mode != BOND_MODE_8023AD) {
4433 pr_info("lacp_rate param is irrelevant in mode %s\n",
4434 bond_mode_name(bond_mode));
4436 lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4437 if (lacp_fast == -1) {
4438 pr_err("Error: Invalid lacp rate \"%s\"\n",
4439 lacp_rate == NULL ? "NULL" : lacp_rate);
4446 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl);
4447 if (params->ad_select == -1) {
4448 pr_err("Error: Invalid ad_select \"%s\"\n",
4449 ad_select == NULL ? "NULL" : ad_select);
4453 if (bond_mode != BOND_MODE_8023AD) {
4454 pr_warning("ad_select param only affects 802.3ad mode\n");
4457 params->ad_select = BOND_AD_STABLE;
4460 if (max_bonds < 0) {
4461 pr_warning("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4462 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4463 max_bonds = BOND_DEFAULT_MAX_BONDS;
4467 pr_warning("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to %d\n",
4468 miimon, INT_MAX, BOND_LINK_MON_INTERV);
4469 miimon = BOND_LINK_MON_INTERV;
4473 pr_warning("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4478 if (downdelay < 0) {
4479 pr_warning("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4480 downdelay, INT_MAX);
4484 if ((use_carrier != 0) && (use_carrier != 1)) {
4485 pr_warning("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4490 if (num_peer_notif < 0 || num_peer_notif > 255) {
4491 pr_warning("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4496 /* reset values for 802.3ad */
4497 if (bond_mode == BOND_MODE_8023AD) {
4499 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");
4500 pr_warning("Forcing miimon to 100msec\n");
4505 if (tx_queues < 1 || tx_queues > 255) {
4506 pr_warning("Warning: tx_queues (%d) should be between "
4507 "1 and 255, resetting to %d\n",
4508 tx_queues, BOND_DEFAULT_TX_QUEUES);
4509 tx_queues = BOND_DEFAULT_TX_QUEUES;
4512 if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4513 pr_warning("Warning: all_slaves_active module parameter (%d), "
4514 "not of valid value (0/1), so it was set to "
4515 "0\n", all_slaves_active);
4516 all_slaves_active = 0;
4519 if (resend_igmp < 0 || resend_igmp > 255) {
4520 pr_warning("Warning: resend_igmp (%d) should be between "
4521 "0 and 255, resetting to %d\n",
4522 resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4523 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4526 /* reset values for TLB/ALB */
4527 if ((bond_mode == BOND_MODE_TLB) ||
4528 (bond_mode == BOND_MODE_ALB)) {
4530 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");
4531 pr_warning("Forcing miimon to 100msec\n");
4536 if (bond_mode == BOND_MODE_ALB) {
4537 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",
4542 if (updelay || downdelay) {
4543 /* just warn the user the up/down delay will have
4544 * no effect since miimon is zero...
4546 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",
4547 updelay, downdelay);
4550 /* don't allow arp monitoring */
4552 pr_warning("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4553 miimon, arp_interval);
4557 if ((updelay % miimon) != 0) {
4558 pr_warning("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4560 (updelay / miimon) * miimon);
4565 if ((downdelay % miimon) != 0) {
4566 pr_warning("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4568 (downdelay / miimon) * miimon);
4571 downdelay /= miimon;
4574 if (arp_interval < 0) {
4575 pr_warning("Warning: arp_interval module parameter (%d) , not in range 0-%d, so it was reset to %d\n",
4576 arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4577 arp_interval = BOND_LINK_ARP_INTERV;
4580 for (arp_ip_count = 0;
4581 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
4583 /* not complete check, but should be good enough to
4585 __be32 ip = in_aton(arp_ip_target[arp_ip_count]);
4586 if (!isdigit(arp_ip_target[arp_ip_count][0]) ||
4587 ip == 0 || ip == htonl(INADDR_BROADCAST)) {
4588 pr_warning("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4589 arp_ip_target[arp_ip_count]);
4592 arp_target[arp_ip_count] = ip;
4596 if (arp_interval && !arp_ip_count) {
4597 /* don't allow arping if no arp_ip_target given... */
4598 pr_warning("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4604 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4605 pr_err("arp_validate only supported in active-backup mode\n");
4608 if (!arp_interval) {
4609 pr_err("arp_validate requires arp_interval\n");
4613 arp_validate_value = bond_parse_parm(arp_validate,
4615 if (arp_validate_value == -1) {
4616 pr_err("Error: invalid arp_validate \"%s\"\n",
4617 arp_validate == NULL ? "NULL" : arp_validate);
4621 arp_validate_value = 0;
4624 pr_info("MII link monitoring set to %d ms\n", miimon);
4625 } else if (arp_interval) {
4628 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4630 arp_validate_tbl[arp_validate_value].modename,
4633 for (i = 0; i < arp_ip_count; i++)
4634 pr_info(" %s", arp_ip_target[i]);
4638 } else if (max_bonds) {
4639 /* miimon and arp_interval not set, we need one so things
4640 * work as expected, see bonding.txt for details
4642 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");
4645 if (primary && !USES_PRIMARY(bond_mode)) {
4646 /* currently, using a primary only makes sense
4647 * in active backup, TLB or ALB modes
4649 pr_warning("Warning: %s primary device specified but has no effect in %s mode\n",
4650 primary, bond_mode_name(bond_mode));
4654 if (primary && primary_reselect) {
4655 primary_reselect_value = bond_parse_parm(primary_reselect,
4657 if (primary_reselect_value == -1) {
4658 pr_err("Error: Invalid primary_reselect \"%s\"\n",
4660 NULL ? "NULL" : primary_reselect);
4664 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4667 if (fail_over_mac) {
4668 fail_over_mac_value = bond_parse_parm(fail_over_mac,
4670 if (fail_over_mac_value == -1) {
4671 pr_err("Error: invalid fail_over_mac \"%s\"\n",
4672 arp_validate == NULL ? "NULL" : arp_validate);
4676 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4677 pr_warning("Warning: fail_over_mac only affects active-backup mode.\n");
4679 fail_over_mac_value = BOND_FOM_NONE;
4682 /* fill params struct with the proper values */
4683 params->mode = bond_mode;
4684 params->xmit_policy = xmit_hashtype;
4685 params->miimon = miimon;
4686 params->num_peer_notif = num_peer_notif;
4687 params->arp_interval = arp_interval;
4688 params->arp_validate = arp_validate_value;
4689 params->updelay = updelay;
4690 params->downdelay = downdelay;
4691 params->use_carrier = use_carrier;
4692 params->lacp_fast = lacp_fast;
4693 params->primary[0] = 0;
4694 params->primary_reselect = primary_reselect_value;
4695 params->fail_over_mac = fail_over_mac_value;
4696 params->tx_queues = tx_queues;
4697 params->all_slaves_active = all_slaves_active;
4698 params->resend_igmp = resend_igmp;
4699 params->min_links = min_links;
4702 strncpy(params->primary, primary, IFNAMSIZ);
4703 params->primary[IFNAMSIZ - 1] = 0;
4706 memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4711 static struct lock_class_key bonding_netdev_xmit_lock_key;
4712 static struct lock_class_key bonding_netdev_addr_lock_key;
4713 static struct lock_class_key bonding_tx_busylock_key;
4715 static void bond_set_lockdep_class_one(struct net_device *dev,
4716 struct netdev_queue *txq,
4719 lockdep_set_class(&txq->_xmit_lock,
4720 &bonding_netdev_xmit_lock_key);
4723 static void bond_set_lockdep_class(struct net_device *dev)
4725 lockdep_set_class(&dev->addr_list_lock,
4726 &bonding_netdev_addr_lock_key);
4727 netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4728 dev->qdisc_tx_busylock = &bonding_tx_busylock_key;
4732 * Called from registration process
4734 static int bond_init(struct net_device *bond_dev)
4736 struct bonding *bond = netdev_priv(bond_dev);
4737 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4738 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
4740 pr_debug("Begin bond_init for %s\n", bond_dev->name);
4743 * Initialize locks that may be required during
4744 * en/deslave operations. All of the bond_open work
4745 * (of which this is part) should really be moved to
4746 * a phase prior to dev_open
4748 spin_lock_init(&(bond_info->tx_hashtbl_lock));
4749 spin_lock_init(&(bond_info->rx_hashtbl_lock));
4751 bond->wq = create_singlethread_workqueue(bond_dev->name);
4755 bond_set_lockdep_class(bond_dev);
4757 list_add_tail(&bond->bond_list, &bn->dev_list);
4759 bond_prepare_sysfs_group(bond);
4761 bond_debug_register(bond);
4763 /* Ensure valid dev_addr */
4764 if (is_zero_ether_addr(bond_dev->dev_addr) &&
4765 bond_dev->addr_assign_type == NET_ADDR_PERM) {
4766 eth_hw_addr_random(bond_dev);
4767 bond->dev_addr_from_first = true;
4770 __hw_addr_init(&bond->mc_list);
4774 static int bond_validate(struct nlattr *tb[], struct nlattr *data[])
4776 if (tb[IFLA_ADDRESS]) {
4777 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
4779 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
4780 return -EADDRNOTAVAIL;
4785 static unsigned int bond_get_num_tx_queues(void)
4790 static struct rtnl_link_ops bond_link_ops __read_mostly = {
4792 .priv_size = sizeof(struct bonding),
4793 .setup = bond_setup,
4794 .validate = bond_validate,
4795 .get_num_tx_queues = bond_get_num_tx_queues,
4796 .get_num_rx_queues = bond_get_num_tx_queues, /* Use the same number
4800 /* Create a new bond based on the specified name and bonding parameters.
4801 * If name is NULL, obtain a suitable "bond%d" name for us.
4802 * Caller must NOT hold rtnl_lock; we need to release it here before we
4803 * set up our sysfs entries.
4805 int bond_create(struct net *net, const char *name)
4807 struct net_device *bond_dev;
4812 bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4813 name ? name : "bond%d",
4814 bond_setup, tx_queues);
4816 pr_err("%s: eek! can't alloc netdev!\n", name);
4821 dev_net_set(bond_dev, net);
4822 bond_dev->rtnl_link_ops = &bond_link_ops;
4824 res = register_netdevice(bond_dev);
4826 netif_carrier_off(bond_dev);
4830 bond_destructor(bond_dev);
4834 static int __net_init bond_net_init(struct net *net)
4836 struct bond_net *bn = net_generic(net, bond_net_id);
4839 INIT_LIST_HEAD(&bn->dev_list);
4841 bond_create_proc_dir(bn);
4842 bond_create_sysfs(bn);
4847 static void __net_exit bond_net_exit(struct net *net)
4849 struct bond_net *bn = net_generic(net, bond_net_id);
4851 bond_destroy_sysfs(bn);
4852 bond_destroy_proc_dir(bn);
4855 static struct pernet_operations bond_net_ops = {
4856 .init = bond_net_init,
4857 .exit = bond_net_exit,
4859 .size = sizeof(struct bond_net),
4862 static int __init bonding_init(void)
4867 pr_info("%s", bond_version);
4869 res = bond_check_params(&bonding_defaults);
4873 res = register_pernet_subsys(&bond_net_ops);
4877 res = rtnl_link_register(&bond_link_ops);
4881 bond_create_debugfs();
4883 for (i = 0; i < max_bonds; i++) {
4884 res = bond_create(&init_net, NULL);
4889 register_netdevice_notifier(&bond_netdev_notifier);
4893 rtnl_link_unregister(&bond_link_ops);
4895 unregister_pernet_subsys(&bond_net_ops);
4900 static void __exit bonding_exit(void)
4902 unregister_netdevice_notifier(&bond_netdev_notifier);
4904 bond_destroy_debugfs();
4906 rtnl_link_unregister(&bond_link_ops);
4907 unregister_pernet_subsys(&bond_net_ops);
4909 #ifdef CONFIG_NET_POLL_CONTROLLER
4911 * Make sure we don't have an imbalance on our netpoll blocking
4913 WARN_ON(atomic_read(&netpoll_block_tx));
4917 module_init(bonding_init);
4918 module_exit(bonding_exit);
4919 MODULE_LICENSE("GPL");
4920 MODULE_VERSION(DRV_VERSION);
4921 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4922 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
4923 MODULE_ALIAS_RTNL_LINK("bond");