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,
432 __be16 proto, u16 vid)
434 struct bonding *bond = netdev_priv(bond_dev);
435 struct slave *slave, *stop_at;
438 bond_for_each_slave(bond, slave, i) {
439 res = vlan_vid_add(slave->dev, proto, vid);
444 res = bond_add_vlan(bond, vid);
446 pr_err("%s: Error: Failed to add vlan id %d\n",
447 bond_dev->name, vid);
454 /* unwind from head to the slave that failed */
456 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at)
457 vlan_vid_del(slave->dev, proto, vid);
463 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
464 * @bond_dev: bonding net device that got called
465 * @vid: vlan id being removed
467 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
468 __be16 proto, u16 vid)
470 struct bonding *bond = netdev_priv(bond_dev);
474 bond_for_each_slave(bond, slave, i)
475 vlan_vid_del(slave->dev, proto, vid);
477 res = bond_del_vlan(bond, vid);
479 pr_err("%s: Error: Failed to remove vlan id %d\n",
480 bond_dev->name, vid);
487 static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
489 struct vlan_entry *vlan;
492 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
493 res = vlan_vid_add(slave_dev, htons(ETH_P_8021Q),
496 pr_warning("%s: Failed to add vlan id %d to device %s\n",
497 bond->dev->name, vlan->vlan_id,
502 static void bond_del_vlans_from_slave(struct bonding *bond,
503 struct net_device *slave_dev)
505 struct vlan_entry *vlan;
507 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
510 vlan_vid_del(slave_dev, htons(ETH_P_8021Q), vlan->vlan_id);
514 /*------------------------------- Link status -------------------------------*/
517 * Set the carrier state for the master according to the state of its
518 * slaves. If any slaves are up, the master is up. In 802.3ad mode,
519 * do special 802.3ad magic.
521 * Returns zero if carrier state does not change, nonzero if it does.
523 static int bond_set_carrier(struct bonding *bond)
528 if (bond->slave_cnt == 0)
531 if (bond->params.mode == BOND_MODE_8023AD)
532 return bond_3ad_set_carrier(bond);
534 bond_for_each_slave(bond, slave, i) {
535 if (slave->link == BOND_LINK_UP) {
536 if (!netif_carrier_ok(bond->dev)) {
537 netif_carrier_on(bond->dev);
545 if (netif_carrier_ok(bond->dev)) {
546 netif_carrier_off(bond->dev);
553 * Get link speed and duplex from the slave's base driver
554 * using ethtool. If for some reason the call fails or the
555 * values are invalid, set speed and duplex to -1,
558 static void bond_update_speed_duplex(struct slave *slave)
560 struct net_device *slave_dev = slave->dev;
561 struct ethtool_cmd ecmd;
565 slave->speed = SPEED_UNKNOWN;
566 slave->duplex = DUPLEX_UNKNOWN;
568 res = __ethtool_get_settings(slave_dev, &ecmd);
572 slave_speed = ethtool_cmd_speed(&ecmd);
573 if (slave_speed == 0 || slave_speed == ((__u32) -1))
576 switch (ecmd.duplex) {
584 slave->speed = slave_speed;
585 slave->duplex = ecmd.duplex;
591 * if <dev> supports MII link status reporting, check its link status.
593 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
594 * depending upon the setting of the use_carrier parameter.
596 * Return either BMSR_LSTATUS, meaning that the link is up (or we
597 * can't tell and just pretend it is), or 0, meaning that the link is
600 * If reporting is non-zero, instead of faking link up, return -1 if
601 * both ETHTOOL and MII ioctls fail (meaning the device does not
602 * support them). If use_carrier is set, return whatever it says.
603 * It'd be nice if there was a good way to tell if a driver supports
604 * netif_carrier, but there really isn't.
606 static int bond_check_dev_link(struct bonding *bond,
607 struct net_device *slave_dev, int reporting)
609 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
610 int (*ioctl)(struct net_device *, struct ifreq *, int);
612 struct mii_ioctl_data *mii;
614 if (!reporting && !netif_running(slave_dev))
617 if (bond->params.use_carrier)
618 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
620 /* Try to get link status using Ethtool first. */
621 if (slave_dev->ethtool_ops->get_link)
622 return slave_dev->ethtool_ops->get_link(slave_dev) ?
625 /* Ethtool can't be used, fallback to MII ioctls. */
626 ioctl = slave_ops->ndo_do_ioctl;
628 /* TODO: set pointer to correct ioctl on a per team member */
629 /* bases to make this more efficient. that is, once */
630 /* we determine the correct ioctl, we will always */
631 /* call it and not the others for that team */
635 * We cannot assume that SIOCGMIIPHY will also read a
636 * register; not all network drivers (e.g., e100)
640 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
641 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
643 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
644 mii->reg_num = MII_BMSR;
645 if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
646 return mii->val_out & BMSR_LSTATUS;
651 * If reporting, report that either there's no dev->do_ioctl,
652 * or both SIOCGMIIREG and get_link failed (meaning that we
653 * cannot report link status). If not reporting, pretend
656 return reporting ? -1 : BMSR_LSTATUS;
659 /*----------------------------- Multicast list ------------------------------*/
662 * Push the promiscuity flag down to appropriate slaves
664 static int bond_set_promiscuity(struct bonding *bond, int inc)
667 if (USES_PRIMARY(bond->params.mode)) {
668 /* write lock already acquired */
669 if (bond->curr_active_slave) {
670 err = dev_set_promiscuity(bond->curr_active_slave->dev,
676 bond_for_each_slave(bond, slave, i) {
677 err = dev_set_promiscuity(slave->dev, inc);
686 * Push the allmulti flag down to all slaves
688 static int bond_set_allmulti(struct bonding *bond, int inc)
691 if (USES_PRIMARY(bond->params.mode)) {
692 /* write lock already acquired */
693 if (bond->curr_active_slave) {
694 err = dev_set_allmulti(bond->curr_active_slave->dev,
700 bond_for_each_slave(bond, slave, i) {
701 err = dev_set_allmulti(slave->dev, inc);
710 * Add a Multicast address to slaves
713 static void bond_mc_add(struct bonding *bond, void *addr)
715 if (USES_PRIMARY(bond->params.mode)) {
716 /* write lock already acquired */
717 if (bond->curr_active_slave)
718 dev_mc_add(bond->curr_active_slave->dev, addr);
723 bond_for_each_slave(bond, slave, i)
724 dev_mc_add(slave->dev, addr);
729 * Remove a multicast address from slave
732 static void bond_mc_del(struct bonding *bond, void *addr)
734 if (USES_PRIMARY(bond->params.mode)) {
735 /* write lock already acquired */
736 if (bond->curr_active_slave)
737 dev_mc_del(bond->curr_active_slave->dev, addr);
741 bond_for_each_slave(bond, slave, i) {
742 dev_mc_del(slave->dev, addr);
748 static void __bond_resend_igmp_join_requests(struct net_device *dev)
750 struct in_device *in_dev;
752 in_dev = __in_dev_get_rcu(dev);
754 ip_mc_rejoin_groups(in_dev);
758 * Retrieve the list of registered multicast addresses for the bonding
759 * device and retransmit an IGMP JOIN request to the current active
762 static void bond_resend_igmp_join_requests(struct bonding *bond)
764 struct net_device *bond_dev, *vlan_dev, *upper_dev;
765 struct vlan_entry *vlan;
767 read_lock(&bond->lock);
770 bond_dev = bond->dev;
772 /* rejoin all groups on bond device */
773 __bond_resend_igmp_join_requests(bond_dev);
776 * if bond is enslaved to a bridge,
777 * then rejoin all groups on its master
779 upper_dev = netdev_master_upper_dev_get_rcu(bond_dev);
780 if (upper_dev && upper_dev->priv_flags & IFF_EBRIDGE)
781 __bond_resend_igmp_join_requests(upper_dev);
783 /* rejoin all groups on vlan devices */
784 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
785 vlan_dev = __vlan_find_dev_deep(bond_dev, htons(ETH_P_8021Q),
788 __bond_resend_igmp_join_requests(vlan_dev);
792 /* We use curr_slave_lock to protect against concurrent access to
793 * igmp_retrans from multiple running instances of this function and
794 * bond_change_active_slave
796 write_lock_bh(&bond->curr_slave_lock);
797 if (bond->igmp_retrans > 1) {
798 bond->igmp_retrans--;
799 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
801 write_unlock_bh(&bond->curr_slave_lock);
802 read_unlock(&bond->lock);
805 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
807 struct bonding *bond = container_of(work, struct bonding,
810 bond_resend_igmp_join_requests(bond);
814 * flush all members of flush->mc_list from device dev->mc_list
816 static void bond_mc_list_flush(struct net_device *bond_dev,
817 struct net_device *slave_dev)
819 struct bonding *bond = netdev_priv(bond_dev);
820 struct netdev_hw_addr *ha;
822 netdev_for_each_mc_addr(ha, bond_dev)
823 dev_mc_del(slave_dev, ha->addr);
825 if (bond->params.mode == BOND_MODE_8023AD) {
826 /* del lacpdu mc addr from mc list */
827 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
829 dev_mc_del(slave_dev, lacpdu_multicast);
833 /*--------------------------- Active slave change ---------------------------*/
836 * Update the mc list and multicast-related flags for the new and
837 * old active slaves (if any) according to the multicast mode, and
838 * promiscuous flags unconditionally.
840 static void bond_mc_swap(struct bonding *bond, struct slave *new_active,
841 struct slave *old_active)
843 struct netdev_hw_addr *ha;
845 if (!USES_PRIMARY(bond->params.mode))
846 /* nothing to do - mc list is already up-to-date on
852 if (bond->dev->flags & IFF_PROMISC)
853 dev_set_promiscuity(old_active->dev, -1);
855 if (bond->dev->flags & IFF_ALLMULTI)
856 dev_set_allmulti(old_active->dev, -1);
858 netif_addr_lock_bh(bond->dev);
859 netdev_for_each_mc_addr(ha, bond->dev)
860 dev_mc_del(old_active->dev, ha->addr);
861 netif_addr_unlock_bh(bond->dev);
865 /* FIXME: Signal errors upstream. */
866 if (bond->dev->flags & IFF_PROMISC)
867 dev_set_promiscuity(new_active->dev, 1);
869 if (bond->dev->flags & IFF_ALLMULTI)
870 dev_set_allmulti(new_active->dev, 1);
872 netif_addr_lock_bh(bond->dev);
873 netdev_for_each_mc_addr(ha, bond->dev)
874 dev_mc_add(new_active->dev, ha->addr);
875 netif_addr_unlock_bh(bond->dev);
880 * bond_do_fail_over_mac
882 * Perform special MAC address swapping for fail_over_mac settings
884 * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh.
886 static void bond_do_fail_over_mac(struct bonding *bond,
887 struct slave *new_active,
888 struct slave *old_active)
889 __releases(&bond->curr_slave_lock)
890 __releases(&bond->lock)
891 __acquires(&bond->lock)
892 __acquires(&bond->curr_slave_lock)
894 u8 tmp_mac[ETH_ALEN];
895 struct sockaddr saddr;
898 switch (bond->params.fail_over_mac) {
899 case BOND_FOM_ACTIVE:
901 memcpy(bond->dev->dev_addr, new_active->dev->dev_addr,
902 new_active->dev->addr_len);
903 write_unlock_bh(&bond->curr_slave_lock);
904 read_unlock(&bond->lock);
905 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
906 read_lock(&bond->lock);
907 write_lock_bh(&bond->curr_slave_lock);
910 case BOND_FOM_FOLLOW:
912 * if new_active && old_active, swap them
913 * if just old_active, do nothing (going to no active slave)
914 * if just new_active, set new_active to bond's MAC
919 write_unlock_bh(&bond->curr_slave_lock);
920 read_unlock(&bond->lock);
923 memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN);
924 memcpy(saddr.sa_data, old_active->dev->dev_addr,
926 saddr.sa_family = new_active->dev->type;
928 memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN);
929 saddr.sa_family = bond->dev->type;
932 rv = dev_set_mac_address(new_active->dev, &saddr);
934 pr_err("%s: Error %d setting MAC of slave %s\n",
935 bond->dev->name, -rv, new_active->dev->name);
942 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN);
943 saddr.sa_family = old_active->dev->type;
945 rv = dev_set_mac_address(old_active->dev, &saddr);
947 pr_err("%s: Error %d setting MAC of slave %s\n",
948 bond->dev->name, -rv, new_active->dev->name);
950 read_lock(&bond->lock);
951 write_lock_bh(&bond->curr_slave_lock);
954 pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n",
955 bond->dev->name, bond->params.fail_over_mac);
961 static bool bond_should_change_active(struct bonding *bond)
963 struct slave *prim = bond->primary_slave;
964 struct slave *curr = bond->curr_active_slave;
966 if (!prim || !curr || curr->link != BOND_LINK_UP)
968 if (bond->force_primary) {
969 bond->force_primary = false;
972 if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
973 (prim->speed < curr->speed ||
974 (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
976 if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
982 * find_best_interface - select the best available slave to be the active one
983 * @bond: our bonding struct
985 * Warning: Caller must hold curr_slave_lock for writing.
987 static struct slave *bond_find_best_slave(struct bonding *bond)
989 struct slave *new_active, *old_active;
990 struct slave *bestslave = NULL;
991 int mintime = bond->params.updelay;
994 new_active = bond->curr_active_slave;
996 if (!new_active) { /* there were no active slaves left */
997 if (bond->slave_cnt > 0) /* found one slave */
998 new_active = bond->first_slave;
1000 return NULL; /* still no slave, return NULL */
1003 if ((bond->primary_slave) &&
1004 bond->primary_slave->link == BOND_LINK_UP &&
1005 bond_should_change_active(bond)) {
1006 new_active = bond->primary_slave;
1009 /* remember where to stop iterating over the slaves */
1010 old_active = new_active;
1012 bond_for_each_slave_from(bond, new_active, i, old_active) {
1013 if (new_active->link == BOND_LINK_UP) {
1015 } else if (new_active->link == BOND_LINK_BACK &&
1016 IS_UP(new_active->dev)) {
1017 /* link up, but waiting for stabilization */
1018 if (new_active->delay < mintime) {
1019 mintime = new_active->delay;
1020 bestslave = new_active;
1028 static bool bond_should_notify_peers(struct bonding *bond)
1030 struct slave *slave = bond->curr_active_slave;
1032 pr_debug("bond_should_notify_peers: bond %s slave %s\n",
1033 bond->dev->name, slave ? slave->dev->name : "NULL");
1035 if (!slave || !bond->send_peer_notif ||
1036 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
1039 bond->send_peer_notif--;
1044 * change_active_interface - change the active slave into the specified one
1045 * @bond: our bonding struct
1046 * @new: the new slave to make the active one
1048 * Set the new slave to the bond's settings and unset them on the old
1049 * curr_active_slave.
1050 * Setting include flags, mc-list, promiscuity, allmulti, etc.
1052 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1053 * because it is apparently the best available slave we have, even though its
1054 * updelay hasn't timed out yet.
1056 * If new_active is not NULL, caller must hold bond->lock for read and
1057 * curr_slave_lock for write_bh.
1059 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1061 struct slave *old_active = bond->curr_active_slave;
1063 if (old_active == new_active)
1067 new_active->jiffies = jiffies;
1069 if (new_active->link == BOND_LINK_BACK) {
1070 if (USES_PRIMARY(bond->params.mode)) {
1071 pr_info("%s: making interface %s the new active one %d ms earlier.\n",
1072 bond->dev->name, new_active->dev->name,
1073 (bond->params.updelay - new_active->delay) * bond->params.miimon);
1076 new_active->delay = 0;
1077 new_active->link = BOND_LINK_UP;
1079 if (bond->params.mode == BOND_MODE_8023AD)
1080 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1082 if (bond_is_lb(bond))
1083 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1085 if (USES_PRIMARY(bond->params.mode)) {
1086 pr_info("%s: making interface %s the new active one.\n",
1087 bond->dev->name, new_active->dev->name);
1092 if (USES_PRIMARY(bond->params.mode))
1093 bond_mc_swap(bond, new_active, old_active);
1095 if (bond_is_lb(bond)) {
1096 bond_alb_handle_active_change(bond, new_active);
1098 bond_set_slave_inactive_flags(old_active);
1100 bond_set_slave_active_flags(new_active);
1102 bond->curr_active_slave = new_active;
1105 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1107 bond_set_slave_inactive_flags(old_active);
1110 bool should_notify_peers = false;
1112 bond_set_slave_active_flags(new_active);
1114 if (bond->params.fail_over_mac)
1115 bond_do_fail_over_mac(bond, new_active,
1118 if (netif_running(bond->dev)) {
1119 bond->send_peer_notif =
1120 bond->params.num_peer_notif;
1121 should_notify_peers =
1122 bond_should_notify_peers(bond);
1125 write_unlock_bh(&bond->curr_slave_lock);
1126 read_unlock(&bond->lock);
1128 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
1129 if (should_notify_peers)
1130 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
1133 read_lock(&bond->lock);
1134 write_lock_bh(&bond->curr_slave_lock);
1138 /* resend IGMP joins since active slave has changed or
1139 * all were sent on curr_active_slave.
1140 * resend only if bond is brought up with the affected
1141 * bonding modes and the retransmission is enabled */
1142 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
1143 ((USES_PRIMARY(bond->params.mode) && new_active) ||
1144 bond->params.mode == BOND_MODE_ROUNDROBIN)) {
1145 bond->igmp_retrans = bond->params.resend_igmp;
1146 queue_delayed_work(bond->wq, &bond->mcast_work, 0);
1151 * bond_select_active_slave - select a new active slave, if needed
1152 * @bond: our bonding struct
1154 * This functions should be called when one of the following occurs:
1155 * - The old curr_active_slave has been released or lost its link.
1156 * - The primary_slave has got its link back.
1157 * - A slave has got its link back and there's no old curr_active_slave.
1159 * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
1161 void bond_select_active_slave(struct bonding *bond)
1163 struct slave *best_slave;
1166 best_slave = bond_find_best_slave(bond);
1167 if (best_slave != bond->curr_active_slave) {
1168 bond_change_active_slave(bond, best_slave);
1169 rv = bond_set_carrier(bond);
1173 if (netif_carrier_ok(bond->dev)) {
1174 pr_info("%s: first active interface up!\n",
1177 pr_info("%s: now running without any active interface !\n",
1183 /*--------------------------- slave list handling ---------------------------*/
1186 * This function attaches the slave to the end of list.
1188 * bond->lock held for writing by caller.
1190 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1192 if (bond->first_slave == NULL) { /* attaching the first slave */
1193 new_slave->next = new_slave;
1194 new_slave->prev = new_slave;
1195 bond->first_slave = new_slave;
1197 new_slave->next = bond->first_slave;
1198 new_slave->prev = bond->first_slave->prev;
1199 new_slave->next->prev = new_slave;
1200 new_slave->prev->next = new_slave;
1207 * This function detaches the slave from the list.
1208 * WARNING: no check is made to verify if the slave effectively
1209 * belongs to <bond>.
1210 * Nothing is freed on return, structures are just unchained.
1211 * If any slave pointer in bond was pointing to <slave>,
1212 * it should be changed by the calling function.
1214 * bond->lock held for writing by caller.
1216 static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1219 slave->next->prev = slave->prev;
1222 slave->prev->next = slave->next;
1224 if (bond->first_slave == slave) { /* slave is the first slave */
1225 if (bond->slave_cnt > 1) { /* there are more slave */
1226 bond->first_slave = slave->next;
1228 bond->first_slave = NULL; /* slave was the last one */
1237 #ifdef CONFIG_NET_POLL_CONTROLLER
1238 static inline int slave_enable_netpoll(struct slave *slave)
1243 np = kzalloc(sizeof(*np), GFP_ATOMIC);
1248 err = __netpoll_setup(np, slave->dev, GFP_ATOMIC);
1257 static inline void slave_disable_netpoll(struct slave *slave)
1259 struct netpoll *np = slave->np;
1265 __netpoll_free_async(np);
1267 static inline bool slave_dev_support_netpoll(struct net_device *slave_dev)
1269 if (slave_dev->priv_flags & IFF_DISABLE_NETPOLL)
1271 if (!slave_dev->netdev_ops->ndo_poll_controller)
1276 static void bond_poll_controller(struct net_device *bond_dev)
1280 static void __bond_netpoll_cleanup(struct bonding *bond)
1282 struct slave *slave;
1285 bond_for_each_slave(bond, slave, i)
1286 if (IS_UP(slave->dev))
1287 slave_disable_netpoll(slave);
1289 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1291 struct bonding *bond = netdev_priv(bond_dev);
1293 read_lock(&bond->lock);
1294 __bond_netpoll_cleanup(bond);
1295 read_unlock(&bond->lock);
1298 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni, gfp_t gfp)
1300 struct bonding *bond = netdev_priv(dev);
1301 struct slave *slave;
1304 read_lock(&bond->lock);
1305 bond_for_each_slave(bond, slave, i) {
1306 err = slave_enable_netpoll(slave);
1308 __bond_netpoll_cleanup(bond);
1312 read_unlock(&bond->lock);
1316 static struct netpoll_info *bond_netpoll_info(struct bonding *bond)
1318 return bond->dev->npinfo;
1322 static inline int slave_enable_netpoll(struct slave *slave)
1326 static inline void slave_disable_netpoll(struct slave *slave)
1329 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1334 /*---------------------------------- IOCTL ----------------------------------*/
1336 static void bond_set_dev_addr(struct net_device *bond_dev,
1337 struct net_device *slave_dev)
1339 pr_debug("bond_dev=%p\n", bond_dev);
1340 pr_debug("slave_dev=%p\n", slave_dev);
1341 pr_debug("slave_dev->addr_len=%d\n", slave_dev->addr_len);
1342 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
1343 bond_dev->addr_assign_type = NET_ADDR_SET;
1344 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
1347 static netdev_features_t bond_fix_features(struct net_device *dev,
1348 netdev_features_t features)
1350 struct slave *slave;
1351 struct bonding *bond = netdev_priv(dev);
1352 netdev_features_t mask;
1355 read_lock(&bond->lock);
1357 if (!bond->first_slave) {
1358 /* Disable adding VLANs to empty bond. But why? --mq */
1359 features |= NETIF_F_VLAN_CHALLENGED;
1364 features &= ~NETIF_F_ONE_FOR_ALL;
1365 features |= NETIF_F_ALL_FOR_ALL;
1367 bond_for_each_slave(bond, slave, i) {
1368 features = netdev_increment_features(features,
1369 slave->dev->features,
1372 features = netdev_add_tso_features(features, mask);
1375 read_unlock(&bond->lock);
1379 #define BOND_VLAN_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | \
1380 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1381 NETIF_F_HIGHDMA | NETIF_F_LRO)
1383 static void bond_compute_features(struct bonding *bond)
1385 struct slave *slave;
1386 struct net_device *bond_dev = bond->dev;
1387 netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1388 unsigned short max_hard_header_len = ETH_HLEN;
1389 unsigned int gso_max_size = GSO_MAX_SIZE;
1390 u16 gso_max_segs = GSO_MAX_SEGS;
1392 unsigned int flags, dst_release_flag = IFF_XMIT_DST_RELEASE;
1394 read_lock(&bond->lock);
1396 if (!bond->first_slave)
1399 bond_for_each_slave(bond, slave, i) {
1400 vlan_features = netdev_increment_features(vlan_features,
1401 slave->dev->vlan_features, BOND_VLAN_FEATURES);
1403 dst_release_flag &= slave->dev->priv_flags;
1404 if (slave->dev->hard_header_len > max_hard_header_len)
1405 max_hard_header_len = slave->dev->hard_header_len;
1407 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1408 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1412 bond_dev->vlan_features = vlan_features;
1413 bond_dev->hard_header_len = max_hard_header_len;
1414 bond_dev->gso_max_segs = gso_max_segs;
1415 netif_set_gso_max_size(bond_dev, gso_max_size);
1417 flags = bond_dev->priv_flags & ~IFF_XMIT_DST_RELEASE;
1418 bond_dev->priv_flags = flags | dst_release_flag;
1420 read_unlock(&bond->lock);
1422 netdev_change_features(bond_dev);
1425 static void bond_setup_by_slave(struct net_device *bond_dev,
1426 struct net_device *slave_dev)
1428 struct bonding *bond = netdev_priv(bond_dev);
1430 bond_dev->header_ops = slave_dev->header_ops;
1432 bond_dev->type = slave_dev->type;
1433 bond_dev->hard_header_len = slave_dev->hard_header_len;
1434 bond_dev->addr_len = slave_dev->addr_len;
1436 memcpy(bond_dev->broadcast, slave_dev->broadcast,
1437 slave_dev->addr_len);
1438 bond->setup_by_slave = 1;
1441 /* On bonding slaves other than the currently active slave, suppress
1442 * duplicates except for alb non-mcast/bcast.
1444 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1445 struct slave *slave,
1446 struct bonding *bond)
1448 if (bond_is_slave_inactive(slave)) {
1449 if (bond->params.mode == BOND_MODE_ALB &&
1450 skb->pkt_type != PACKET_BROADCAST &&
1451 skb->pkt_type != PACKET_MULTICAST)
1458 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1460 struct sk_buff *skb = *pskb;
1461 struct slave *slave;
1462 struct bonding *bond;
1463 int (*recv_probe)(const struct sk_buff *, struct bonding *,
1465 int ret = RX_HANDLER_ANOTHER;
1467 skb = skb_share_check(skb, GFP_ATOMIC);
1469 return RX_HANDLER_CONSUMED;
1473 slave = bond_slave_get_rcu(skb->dev);
1476 if (bond->params.arp_interval)
1477 slave->dev->last_rx = jiffies;
1479 recv_probe = ACCESS_ONCE(bond->recv_probe);
1481 ret = recv_probe(skb, bond, slave);
1482 if (ret == RX_HANDLER_CONSUMED) {
1488 if (bond_should_deliver_exact_match(skb, slave, bond)) {
1489 return RX_HANDLER_EXACT;
1492 skb->dev = bond->dev;
1494 if (bond->params.mode == BOND_MODE_ALB &&
1495 bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1496 skb->pkt_type == PACKET_HOST) {
1498 if (unlikely(skb_cow_head(skb,
1499 skb->data - skb_mac_header(skb)))) {
1501 return RX_HANDLER_CONSUMED;
1503 memcpy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, ETH_ALEN);
1509 static int bond_master_upper_dev_link(struct net_device *bond_dev,
1510 struct net_device *slave_dev)
1514 err = netdev_master_upper_dev_link(slave_dev, bond_dev);
1517 slave_dev->flags |= IFF_SLAVE;
1518 rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE);
1522 static void bond_upper_dev_unlink(struct net_device *bond_dev,
1523 struct net_device *slave_dev)
1525 netdev_upper_dev_unlink(slave_dev, bond_dev);
1526 slave_dev->flags &= ~IFF_SLAVE;
1527 rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE);
1530 /* enslave device <slave> to bond device <master> */
1531 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1533 struct bonding *bond = netdev_priv(bond_dev);
1534 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1535 struct slave *new_slave = NULL;
1536 struct netdev_hw_addr *ha;
1537 struct sockaddr addr;
1541 if (!bond->params.use_carrier &&
1542 slave_dev->ethtool_ops->get_link == NULL &&
1543 slave_ops->ndo_do_ioctl == NULL) {
1544 pr_warning("%s: Warning: no link monitoring support for %s\n",
1545 bond_dev->name, slave_dev->name);
1548 /* already enslaved */
1549 if (slave_dev->flags & IFF_SLAVE) {
1550 pr_debug("Error, Device was already enslaved\n");
1554 /* vlan challenged mutual exclusion */
1555 /* no need to lock since we're protected by rtnl_lock */
1556 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1557 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1558 if (vlan_uses_dev(bond_dev)) {
1559 pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1560 bond_dev->name, slave_dev->name, bond_dev->name);
1563 pr_warning("%s: Warning: enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1564 bond_dev->name, slave_dev->name,
1565 slave_dev->name, bond_dev->name);
1568 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1572 * Old ifenslave binaries are no longer supported. These can
1573 * be identified with moderate accuracy by the state of the slave:
1574 * the current ifenslave will set the interface down prior to
1575 * enslaving it; the old ifenslave will not.
1577 if ((slave_dev->flags & IFF_UP)) {
1578 pr_err("%s is up. This may be due to an out of date ifenslave.\n",
1581 goto err_undo_flags;
1584 /* set bonding device ether type by slave - bonding netdevices are
1585 * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1586 * there is a need to override some of the type dependent attribs/funcs.
1588 * bond ether type mutual exclusion - don't allow slaves of dissimilar
1589 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1591 if (bond->slave_cnt == 0) {
1592 if (bond_dev->type != slave_dev->type) {
1593 pr_debug("%s: change device type from %d to %d\n",
1595 bond_dev->type, slave_dev->type);
1597 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1599 res = notifier_to_errno(res);
1601 pr_err("%s: refused to change device type\n",
1604 goto err_undo_flags;
1607 /* Flush unicast and multicast addresses */
1608 dev_uc_flush(bond_dev);
1609 dev_mc_flush(bond_dev);
1611 if (slave_dev->type != ARPHRD_ETHER)
1612 bond_setup_by_slave(bond_dev, slave_dev);
1614 ether_setup(bond_dev);
1615 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1618 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1621 } else if (bond_dev->type != slave_dev->type) {
1622 pr_err("%s ether type (%d) is different from other slaves (%d), can not enslave it.\n",
1624 slave_dev->type, bond_dev->type);
1626 goto err_undo_flags;
1629 if (slave_ops->ndo_set_mac_address == NULL) {
1630 if (bond->slave_cnt == 0) {
1631 pr_warning("%s: Warning: The first slave device specified does not support setting the MAC address. Setting fail_over_mac to active.",
1633 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1634 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1635 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",
1638 goto err_undo_flags;
1642 call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1644 /* If this is the first slave, then we need to set the master's hardware
1645 * address to be the same as the slave's. */
1646 if (bond->slave_cnt == 0 && bond->dev_addr_from_first)
1647 bond_set_dev_addr(bond->dev, slave_dev);
1649 new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1652 goto err_undo_flags;
1656 * Set the new_slave's queue_id to be zero. Queue ID mapping
1657 * is set via sysfs or module option if desired.
1659 new_slave->queue_id = 0;
1661 /* Save slave's original mtu and then set it to match the bond */
1662 new_slave->original_mtu = slave_dev->mtu;
1663 res = dev_set_mtu(slave_dev, bond->dev->mtu);
1665 pr_debug("Error %d calling dev_set_mtu\n", res);
1670 * Save slave's original ("permanent") mac address for modes
1671 * that need it, and for restoring it upon release, and then
1672 * set it to the master's address
1674 memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1676 if (!bond->params.fail_over_mac) {
1678 * Set slave to master's mac address. The application already
1679 * set the master's mac address to that of the first slave
1681 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1682 addr.sa_family = slave_dev->type;
1683 res = dev_set_mac_address(slave_dev, &addr);
1685 pr_debug("Error %d calling set_mac_address\n", res);
1686 goto err_restore_mtu;
1690 res = bond_master_upper_dev_link(bond_dev, slave_dev);
1692 pr_debug("Error %d calling bond_master_upper_dev_link\n", res);
1693 goto err_restore_mac;
1696 /* open the slave since the application closed it */
1697 res = dev_open(slave_dev);
1699 pr_debug("Opening slave %s failed\n", slave_dev->name);
1700 goto err_unset_master;
1703 new_slave->bond = bond;
1704 new_slave->dev = slave_dev;
1705 slave_dev->priv_flags |= IFF_BONDING;
1707 if (bond_is_lb(bond)) {
1708 /* bond_alb_init_slave() must be called before all other stages since
1709 * it might fail and we do not want to have to undo everything
1711 res = bond_alb_init_slave(bond, new_slave);
1716 /* If the mode USES_PRIMARY, then the new slave gets the
1717 * master's promisc (and mc) settings only if it becomes the
1718 * curr_active_slave, and that is taken care of later when calling
1719 * bond_change_active()
1721 if (!USES_PRIMARY(bond->params.mode)) {
1722 /* set promiscuity level to new slave */
1723 if (bond_dev->flags & IFF_PROMISC) {
1724 res = dev_set_promiscuity(slave_dev, 1);
1729 /* set allmulti level to new slave */
1730 if (bond_dev->flags & IFF_ALLMULTI) {
1731 res = dev_set_allmulti(slave_dev, 1);
1736 netif_addr_lock_bh(bond_dev);
1737 /* upload master's mc_list to new slave */
1738 netdev_for_each_mc_addr(ha, bond_dev)
1739 dev_mc_add(slave_dev, ha->addr);
1740 netif_addr_unlock_bh(bond_dev);
1743 if (bond->params.mode == BOND_MODE_8023AD) {
1744 /* add lacpdu mc addr to mc list */
1745 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1747 dev_mc_add(slave_dev, lacpdu_multicast);
1750 bond_add_vlans_on_slave(bond, slave_dev);
1752 write_lock_bh(&bond->lock);
1754 bond_attach_slave(bond, new_slave);
1756 new_slave->delay = 0;
1757 new_slave->link_failure_count = 0;
1759 write_unlock_bh(&bond->lock);
1761 bond_compute_features(bond);
1763 bond_update_speed_duplex(new_slave);
1765 read_lock(&bond->lock);
1767 new_slave->last_arp_rx = jiffies -
1768 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1770 if (bond->params.miimon && !bond->params.use_carrier) {
1771 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1773 if ((link_reporting == -1) && !bond->params.arp_interval) {
1775 * miimon is set but a bonded network driver
1776 * does not support ETHTOOL/MII and
1777 * arp_interval is not set. Note: if
1778 * use_carrier is enabled, we will never go
1779 * here (because netif_carrier is always
1780 * supported); thus, we don't need to change
1781 * the messages for netif_carrier.
1783 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",
1784 bond_dev->name, slave_dev->name);
1785 } else if (link_reporting == -1) {
1786 /* unable get link status using mii/ethtool */
1787 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",
1788 bond_dev->name, slave_dev->name);
1792 /* check for initial state */
1793 if (bond->params.miimon) {
1794 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1795 if (bond->params.updelay) {
1796 new_slave->link = BOND_LINK_BACK;
1797 new_slave->delay = bond->params.updelay;
1799 new_slave->link = BOND_LINK_UP;
1802 new_slave->link = BOND_LINK_DOWN;
1804 } else if (bond->params.arp_interval) {
1805 new_slave->link = (netif_carrier_ok(slave_dev) ?
1806 BOND_LINK_UP : BOND_LINK_DOWN);
1808 new_slave->link = BOND_LINK_UP;
1811 if (new_slave->link != BOND_LINK_DOWN)
1812 new_slave->jiffies = jiffies;
1813 pr_debug("Initial state of slave_dev is BOND_LINK_%s\n",
1814 new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1815 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1817 if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1818 /* if there is a primary slave, remember it */
1819 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1820 bond->primary_slave = new_slave;
1821 bond->force_primary = true;
1825 write_lock_bh(&bond->curr_slave_lock);
1827 switch (bond->params.mode) {
1828 case BOND_MODE_ACTIVEBACKUP:
1829 bond_set_slave_inactive_flags(new_slave);
1830 bond_select_active_slave(bond);
1832 case BOND_MODE_8023AD:
1833 /* in 802.3ad mode, the internal mechanism
1834 * will activate the slaves in the selected
1837 bond_set_slave_inactive_flags(new_slave);
1838 /* if this is the first slave */
1839 if (bond->slave_cnt == 1) {
1840 SLAVE_AD_INFO(new_slave).id = 1;
1841 /* Initialize AD with the number of times that the AD timer is called in 1 second
1842 * can be called only after the mac address of the bond is set
1844 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1846 SLAVE_AD_INFO(new_slave).id =
1847 SLAVE_AD_INFO(new_slave->prev).id + 1;
1850 bond_3ad_bind_slave(new_slave);
1854 bond_set_active_slave(new_slave);
1855 bond_set_slave_inactive_flags(new_slave);
1856 bond_select_active_slave(bond);
1859 pr_debug("This slave is always active in trunk mode\n");
1861 /* always active in trunk mode */
1862 bond_set_active_slave(new_slave);
1864 /* In trunking mode there is little meaning to curr_active_slave
1865 * anyway (it holds no special properties of the bond device),
1866 * so we can change it without calling change_active_interface()
1868 if (!bond->curr_active_slave && new_slave->link == BOND_LINK_UP)
1869 bond->curr_active_slave = new_slave;
1872 } /* switch(bond_mode) */
1874 write_unlock_bh(&bond->curr_slave_lock);
1876 bond_set_carrier(bond);
1878 #ifdef CONFIG_NET_POLL_CONTROLLER
1879 slave_dev->npinfo = bond_netpoll_info(bond);
1880 if (slave_dev->npinfo) {
1881 if (slave_enable_netpoll(new_slave)) {
1882 read_unlock(&bond->lock);
1883 pr_info("Error, %s: master_dev is using netpoll, "
1884 "but new slave device does not support netpoll.\n",
1892 read_unlock(&bond->lock);
1894 res = bond_create_slave_symlinks(bond_dev, slave_dev);
1898 res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1901 pr_debug("Error %d calling netdev_rx_handler_register\n", res);
1902 goto err_dest_symlinks;
1905 pr_info("%s: enslaving %s as a%s interface with a%s link.\n",
1906 bond_dev->name, slave_dev->name,
1907 bond_is_active_slave(new_slave) ? "n active" : " backup",
1908 new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1910 /* enslave is successful */
1913 /* Undo stages on error */
1915 bond_destroy_slave_symlinks(bond_dev, slave_dev);
1918 if (!USES_PRIMARY(bond->params.mode)) {
1919 netif_addr_lock_bh(bond_dev);
1920 bond_mc_list_flush(bond_dev, slave_dev);
1921 netif_addr_unlock_bh(bond_dev);
1923 bond_del_vlans_from_slave(bond, slave_dev);
1924 write_lock_bh(&bond->lock);
1925 bond_detach_slave(bond, new_slave);
1926 if (bond->primary_slave == new_slave)
1927 bond->primary_slave = NULL;
1928 if (bond->curr_active_slave == new_slave) {
1929 bond_change_active_slave(bond, NULL);
1930 write_unlock_bh(&bond->lock);
1931 read_lock(&bond->lock);
1932 write_lock_bh(&bond->curr_slave_lock);
1933 bond_select_active_slave(bond);
1934 write_unlock_bh(&bond->curr_slave_lock);
1935 read_unlock(&bond->lock);
1937 write_unlock_bh(&bond->lock);
1939 slave_disable_netpoll(new_slave);
1942 slave_dev->priv_flags &= ~IFF_BONDING;
1943 dev_close(slave_dev);
1946 bond_upper_dev_unlink(bond_dev, slave_dev);
1949 if (!bond->params.fail_over_mac) {
1950 /* XXX TODO - fom follow mode needs to change master's
1951 * MAC if this slave's MAC is in use by the bond, or at
1952 * least print a warning.
1954 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1955 addr.sa_family = slave_dev->type;
1956 dev_set_mac_address(slave_dev, &addr);
1960 dev_set_mtu(slave_dev, new_slave->original_mtu);
1966 bond_compute_features(bond);
1967 /* Enslave of first slave has failed and we need to fix master's mac */
1968 if (bond->slave_cnt == 0 &&
1969 ether_addr_equal(bond_dev->dev_addr, slave_dev->dev_addr))
1970 eth_hw_addr_random(bond_dev);
1976 * Try to release the slave device <slave> from the bond device <master>
1977 * It is legal to access curr_active_slave without a lock because all the function
1978 * is write-locked. If "all" is true it means that the function is being called
1979 * while destroying a bond interface and all slaves are being released.
1981 * The rules for slave state should be:
1982 * for Active/Backup:
1983 * Active stays on all backups go down
1984 * for Bonded connections:
1985 * The first up interface should be left on and all others downed.
1987 static int __bond_release_one(struct net_device *bond_dev,
1988 struct net_device *slave_dev,
1991 struct bonding *bond = netdev_priv(bond_dev);
1992 struct slave *slave, *oldcurrent;
1993 struct sockaddr addr;
1994 netdev_features_t old_features = bond_dev->features;
1996 /* slave is not a slave or master is not master of this slave */
1997 if (!(slave_dev->flags & IFF_SLAVE) ||
1998 !netdev_has_upper_dev(slave_dev, bond_dev)) {
1999 pr_err("%s: Error: cannot release %s.\n",
2000 bond_dev->name, slave_dev->name);
2005 write_lock_bh(&bond->lock);
2007 slave = bond_get_slave_by_dev(bond, slave_dev);
2009 /* not a slave of this bond */
2010 pr_info("%s: %s not enslaved\n",
2011 bond_dev->name, slave_dev->name);
2012 write_unlock_bh(&bond->lock);
2013 unblock_netpoll_tx();
2017 write_unlock_bh(&bond->lock);
2018 /* unregister rx_handler early so bond_handle_frame wouldn't be called
2019 * for this slave anymore.
2021 netdev_rx_handler_unregister(slave_dev);
2022 write_lock_bh(&bond->lock);
2024 if (!all && !bond->params.fail_over_mac) {
2025 if (ether_addr_equal(bond_dev->dev_addr, slave->perm_hwaddr) &&
2026 bond->slave_cnt > 1)
2027 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",
2028 bond_dev->name, slave_dev->name,
2030 bond_dev->name, slave_dev->name);
2033 /* Inform AD package of unbinding of slave. */
2034 if (bond->params.mode == BOND_MODE_8023AD) {
2035 /* must be called before the slave is
2036 * detached from the list
2038 bond_3ad_unbind_slave(slave);
2041 pr_info("%s: releasing %s interface %s\n",
2043 bond_is_active_slave(slave) ? "active" : "backup",
2046 oldcurrent = bond->curr_active_slave;
2048 bond->current_arp_slave = NULL;
2050 /* release the slave from its bond */
2051 bond_detach_slave(bond, slave);
2053 if (bond->primary_slave == slave)
2054 bond->primary_slave = NULL;
2056 if (oldcurrent == slave)
2057 bond_change_active_slave(bond, NULL);
2059 if (bond_is_lb(bond)) {
2060 /* Must be called only after the slave has been
2061 * detached from the list and the curr_active_slave
2062 * has been cleared (if our_slave == old_current),
2063 * but before a new active slave is selected.
2065 write_unlock_bh(&bond->lock);
2066 bond_alb_deinit_slave(bond, slave);
2067 write_lock_bh(&bond->lock);
2071 bond->curr_active_slave = NULL;
2072 } else if (oldcurrent == slave) {
2074 * Note that we hold RTNL over this sequence, so there
2075 * is no concern that another slave add/remove event
2078 write_unlock_bh(&bond->lock);
2079 read_lock(&bond->lock);
2080 write_lock_bh(&bond->curr_slave_lock);
2082 bond_select_active_slave(bond);
2084 write_unlock_bh(&bond->curr_slave_lock);
2085 read_unlock(&bond->lock);
2086 write_lock_bh(&bond->lock);
2089 if (bond->slave_cnt == 0) {
2090 bond_set_carrier(bond);
2091 eth_hw_addr_random(bond_dev);
2092 bond->dev_addr_from_first = true;
2094 if (bond_vlan_used(bond)) {
2095 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
2096 bond_dev->name, bond_dev->name);
2097 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
2102 write_unlock_bh(&bond->lock);
2103 unblock_netpoll_tx();
2105 if (bond->slave_cnt == 0) {
2106 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
2107 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
2110 bond_compute_features(bond);
2111 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
2112 (old_features & NETIF_F_VLAN_CHALLENGED))
2113 pr_info("%s: last VLAN challenged slave %s left bond %s. VLAN blocking is removed\n",
2114 bond_dev->name, slave_dev->name, bond_dev->name);
2116 /* must do this from outside any spinlocks */
2117 bond_destroy_slave_symlinks(bond_dev, slave_dev);
2119 bond_del_vlans_from_slave(bond, slave_dev);
2121 /* If the mode USES_PRIMARY, then we should only remove its
2122 * promisc and mc settings if it was the curr_active_slave, but that was
2123 * already taken care of above when we detached the slave
2125 if (!USES_PRIMARY(bond->params.mode)) {
2126 /* unset promiscuity level from slave */
2127 if (bond_dev->flags & IFF_PROMISC)
2128 dev_set_promiscuity(slave_dev, -1);
2130 /* unset allmulti level from slave */
2131 if (bond_dev->flags & IFF_ALLMULTI)
2132 dev_set_allmulti(slave_dev, -1);
2134 /* flush master's mc_list from slave */
2135 netif_addr_lock_bh(bond_dev);
2136 bond_mc_list_flush(bond_dev, slave_dev);
2137 netif_addr_unlock_bh(bond_dev);
2140 bond_upper_dev_unlink(bond_dev, slave_dev);
2142 slave_disable_netpoll(slave);
2144 /* close slave before restoring its mac address */
2145 dev_close(slave_dev);
2147 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
2148 /* restore original ("permanent") mac address */
2149 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2150 addr.sa_family = slave_dev->type;
2151 dev_set_mac_address(slave_dev, &addr);
2154 dev_set_mtu(slave_dev, slave->original_mtu);
2156 slave_dev->priv_flags &= ~IFF_BONDING;
2160 return 0; /* deletion OK */
2163 /* A wrapper used because of ndo_del_link */
2164 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
2166 return __bond_release_one(bond_dev, slave_dev, false);
2170 * First release a slave and then destroy the bond if no more slaves are left.
2171 * Must be under rtnl_lock when this function is called.
2173 static int bond_release_and_destroy(struct net_device *bond_dev,
2174 struct net_device *slave_dev)
2176 struct bonding *bond = netdev_priv(bond_dev);
2179 ret = bond_release(bond_dev, slave_dev);
2180 if ((ret == 0) && (bond->slave_cnt == 0)) {
2181 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
2182 pr_info("%s: destroying bond %s.\n",
2183 bond_dev->name, bond_dev->name);
2184 unregister_netdevice(bond_dev);
2190 * This function changes the active slave to slave <slave_dev>.
2191 * It returns -EINVAL in the following cases.
2192 * - <slave_dev> is not found in the list.
2193 * - There is not active slave now.
2194 * - <slave_dev> is already active.
2195 * - The link state of <slave_dev> is not BOND_LINK_UP.
2196 * - <slave_dev> is not running.
2197 * In these cases, this function does nothing.
2198 * In the other cases, current_slave pointer is changed and 0 is returned.
2200 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
2202 struct bonding *bond = netdev_priv(bond_dev);
2203 struct slave *old_active = NULL;
2204 struct slave *new_active = NULL;
2207 if (!USES_PRIMARY(bond->params.mode))
2210 /* Verify that bond_dev is indeed the master of slave_dev */
2211 if (!(slave_dev->flags & IFF_SLAVE) ||
2212 !netdev_has_upper_dev(slave_dev, bond_dev))
2215 read_lock(&bond->lock);
2217 read_lock(&bond->curr_slave_lock);
2218 old_active = bond->curr_active_slave;
2219 read_unlock(&bond->curr_slave_lock);
2221 new_active = bond_get_slave_by_dev(bond, slave_dev);
2224 * Changing to the current active: do nothing; return success.
2226 if (new_active && (new_active == old_active)) {
2227 read_unlock(&bond->lock);
2233 (new_active->link == BOND_LINK_UP) &&
2234 IS_UP(new_active->dev)) {
2236 write_lock_bh(&bond->curr_slave_lock);
2237 bond_change_active_slave(bond, new_active);
2238 write_unlock_bh(&bond->curr_slave_lock);
2239 unblock_netpoll_tx();
2243 read_unlock(&bond->lock);
2248 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2250 struct bonding *bond = netdev_priv(bond_dev);
2252 info->bond_mode = bond->params.mode;
2253 info->miimon = bond->params.miimon;
2255 read_lock(&bond->lock);
2256 info->num_slaves = bond->slave_cnt;
2257 read_unlock(&bond->lock);
2262 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2264 struct bonding *bond = netdev_priv(bond_dev);
2265 struct slave *slave;
2266 int i, res = -ENODEV;
2268 read_lock(&bond->lock);
2270 bond_for_each_slave(bond, slave, i) {
2271 if (i == (int)info->slave_id) {
2273 strcpy(info->slave_name, slave->dev->name);
2274 info->link = slave->link;
2275 info->state = bond_slave_state(slave);
2276 info->link_failure_count = slave->link_failure_count;
2281 read_unlock(&bond->lock);
2286 /*-------------------------------- Monitoring -------------------------------*/
2289 static int bond_miimon_inspect(struct bonding *bond)
2291 struct slave *slave;
2292 int i, link_state, commit = 0;
2293 bool ignore_updelay;
2295 ignore_updelay = !bond->curr_active_slave ? true : false;
2297 bond_for_each_slave(bond, slave, i) {
2298 slave->new_link = BOND_LINK_NOCHANGE;
2300 link_state = bond_check_dev_link(bond, slave->dev, 0);
2302 switch (slave->link) {
2307 slave->link = BOND_LINK_FAIL;
2308 slave->delay = bond->params.downdelay;
2310 pr_info("%s: link status down for %sinterface %s, disabling it in %d ms.\n",
2312 (bond->params.mode ==
2313 BOND_MODE_ACTIVEBACKUP) ?
2314 (bond_is_active_slave(slave) ?
2315 "active " : "backup ") : "",
2317 bond->params.downdelay * bond->params.miimon);
2320 case BOND_LINK_FAIL:
2323 * recovered before downdelay expired
2325 slave->link = BOND_LINK_UP;
2326 slave->jiffies = jiffies;
2327 pr_info("%s: link status up again after %d ms for interface %s.\n",
2329 (bond->params.downdelay - slave->delay) *
2330 bond->params.miimon,
2335 if (slave->delay <= 0) {
2336 slave->new_link = BOND_LINK_DOWN;
2344 case BOND_LINK_DOWN:
2348 slave->link = BOND_LINK_BACK;
2349 slave->delay = bond->params.updelay;
2352 pr_info("%s: link status up for interface %s, enabling it in %d ms.\n",
2353 bond->dev->name, slave->dev->name,
2354 ignore_updelay ? 0 :
2355 bond->params.updelay *
2356 bond->params.miimon);
2359 case BOND_LINK_BACK:
2361 slave->link = BOND_LINK_DOWN;
2362 pr_info("%s: link status down again after %d ms for interface %s.\n",
2364 (bond->params.updelay - slave->delay) *
2365 bond->params.miimon,
2374 if (slave->delay <= 0) {
2375 slave->new_link = BOND_LINK_UP;
2377 ignore_updelay = false;
2389 static void bond_miimon_commit(struct bonding *bond)
2391 struct slave *slave;
2394 bond_for_each_slave(bond, slave, i) {
2395 switch (slave->new_link) {
2396 case BOND_LINK_NOCHANGE:
2400 slave->link = BOND_LINK_UP;
2401 slave->jiffies = jiffies;
2403 if (bond->params.mode == BOND_MODE_8023AD) {
2404 /* prevent it from being the active one */
2405 bond_set_backup_slave(slave);
2406 } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2407 /* make it immediately active */
2408 bond_set_active_slave(slave);
2409 } else if (slave != bond->primary_slave) {
2410 /* prevent it from being the active one */
2411 bond_set_backup_slave(slave);
2414 pr_info("%s: link status definitely up for interface %s, %u Mbps %s duplex.\n",
2415 bond->dev->name, slave->dev->name,
2416 slave->speed, slave->duplex ? "full" : "half");
2418 /* notify ad that the link status has changed */
2419 if (bond->params.mode == BOND_MODE_8023AD)
2420 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2422 if (bond_is_lb(bond))
2423 bond_alb_handle_link_change(bond, slave,
2426 if (!bond->curr_active_slave ||
2427 (slave == bond->primary_slave))
2432 case BOND_LINK_DOWN:
2433 if (slave->link_failure_count < UINT_MAX)
2434 slave->link_failure_count++;
2436 slave->link = BOND_LINK_DOWN;
2438 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
2439 bond->params.mode == BOND_MODE_8023AD)
2440 bond_set_slave_inactive_flags(slave);
2442 pr_info("%s: link status definitely down for interface %s, disabling it\n",
2443 bond->dev->name, slave->dev->name);
2445 if (bond->params.mode == BOND_MODE_8023AD)
2446 bond_3ad_handle_link_change(slave,
2449 if (bond_is_lb(bond))
2450 bond_alb_handle_link_change(bond, slave,
2453 if (slave == bond->curr_active_slave)
2459 pr_err("%s: invalid new link %d on slave %s\n",
2460 bond->dev->name, slave->new_link,
2462 slave->new_link = BOND_LINK_NOCHANGE;
2470 write_lock_bh(&bond->curr_slave_lock);
2471 bond_select_active_slave(bond);
2472 write_unlock_bh(&bond->curr_slave_lock);
2473 unblock_netpoll_tx();
2476 bond_set_carrier(bond);
2482 * Really a wrapper that splits the mii monitor into two phases: an
2483 * inspection, then (if inspection indicates something needs to be done)
2484 * an acquisition of appropriate locks followed by a commit phase to
2485 * implement whatever link state changes are indicated.
2487 void bond_mii_monitor(struct work_struct *work)
2489 struct bonding *bond = container_of(work, struct bonding,
2491 bool should_notify_peers = false;
2492 unsigned long delay;
2494 read_lock(&bond->lock);
2496 delay = msecs_to_jiffies(bond->params.miimon);
2498 if (bond->slave_cnt == 0)
2501 should_notify_peers = bond_should_notify_peers(bond);
2503 if (bond_miimon_inspect(bond)) {
2504 read_unlock(&bond->lock);
2506 /* Race avoidance with bond_close cancel of workqueue */
2507 if (!rtnl_trylock()) {
2508 read_lock(&bond->lock);
2510 should_notify_peers = false;
2514 read_lock(&bond->lock);
2516 bond_miimon_commit(bond);
2518 read_unlock(&bond->lock);
2519 rtnl_unlock(); /* might sleep, hold no other locks */
2520 read_lock(&bond->lock);
2524 if (bond->params.miimon)
2525 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2527 read_unlock(&bond->lock);
2529 if (should_notify_peers) {
2530 if (!rtnl_trylock()) {
2531 read_lock(&bond->lock);
2532 bond->send_peer_notif++;
2533 read_unlock(&bond->lock);
2536 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2541 static int bond_has_this_ip(struct bonding *bond, __be32 ip)
2543 struct vlan_entry *vlan;
2544 struct net_device *vlan_dev;
2546 if (ip == bond_confirm_addr(bond->dev, 0, ip))
2549 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2551 vlan_dev = __vlan_find_dev_deep(bond->dev, htons(ETH_P_8021Q),
2554 if (vlan_dev && ip == bond_confirm_addr(vlan_dev, 0, ip))
2562 * We go to the (large) trouble of VLAN tagging ARP frames because
2563 * switches in VLAN mode (especially if ports are configured as
2564 * "native" to a VLAN) might not pass non-tagged frames.
2566 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2568 struct sk_buff *skb;
2570 pr_debug("arp %d on slave %s: dst %pI4 src %pI4 vid %d\n", arp_op,
2571 slave_dev->name, &dest_ip, &src_ip, vlan_id);
2573 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2574 NULL, slave_dev->dev_addr, NULL);
2577 pr_err("ARP packet allocation failed\n");
2581 skb = vlan_put_tag(skb, htons(ETH_P_8021Q), vlan_id);
2583 pr_err("failed to insert VLAN tag\n");
2591 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2594 __be32 *targets = bond->params.arp_targets;
2595 struct vlan_entry *vlan;
2596 struct net_device *vlan_dev = NULL;
2599 for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2603 pr_debug("basa: target %pI4\n", &targets[i]);
2604 if (!bond_vlan_used(bond)) {
2605 pr_debug("basa: empty vlan: arp_send\n");
2606 addr = bond_confirm_addr(bond->dev, targets[i], 0);
2607 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2613 * If VLANs are configured, we do a route lookup to
2614 * determine which VLAN interface would be used, so we
2615 * can tag the ARP with the proper VLAN tag.
2617 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2620 if (net_ratelimit()) {
2621 pr_warning("%s: no route to arp_ip_target %pI4\n",
2622 bond->dev->name, &targets[i]);
2628 * This target is not on a VLAN
2630 if (rt->dst.dev == bond->dev) {
2632 pr_debug("basa: rtdev == bond->dev: arp_send\n");
2633 addr = bond_confirm_addr(bond->dev, targets[i], 0);
2634 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2640 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2642 vlan_dev = __vlan_find_dev_deep(bond->dev,
2646 if (vlan_dev == rt->dst.dev) {
2647 vlan_id = vlan->vlan_id;
2648 pr_debug("basa: vlan match on %s %d\n",
2649 vlan_dev->name, vlan_id);
2654 if (vlan_id && vlan_dev) {
2656 addr = bond_confirm_addr(vlan_dev, targets[i], 0);
2657 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2662 if (net_ratelimit()) {
2663 pr_warning("%s: no path to arp_ip_target %pI4 via rt.dev %s\n",
2664 bond->dev->name, &targets[i],
2665 rt->dst.dev ? rt->dst.dev->name : "NULL");
2671 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2674 __be32 *targets = bond->params.arp_targets;
2676 for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2677 pr_debug("bva: sip %pI4 tip %pI4 t[%d] %pI4 bhti(tip) %d\n",
2678 &sip, &tip, i, &targets[i],
2679 bond_has_this_ip(bond, tip));
2680 if (sip == targets[i]) {
2681 if (bond_has_this_ip(bond, tip))
2682 slave->last_arp_rx = jiffies;
2688 static int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2689 struct slave *slave)
2691 struct arphdr *arp = (struct arphdr *)skb->data;
2692 unsigned char *arp_ptr;
2696 if (skb->protocol != __cpu_to_be16(ETH_P_ARP))
2697 return RX_HANDLER_ANOTHER;
2699 read_lock(&bond->lock);
2700 alen = arp_hdr_len(bond->dev);
2702 pr_debug("bond_arp_rcv: bond %s skb->dev %s\n",
2703 bond->dev->name, skb->dev->name);
2705 if (alen > skb_headlen(skb)) {
2706 arp = kmalloc(alen, GFP_ATOMIC);
2709 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2713 if (arp->ar_hln != bond->dev->addr_len ||
2714 skb->pkt_type == PACKET_OTHERHOST ||
2715 skb->pkt_type == PACKET_LOOPBACK ||
2716 arp->ar_hrd != htons(ARPHRD_ETHER) ||
2717 arp->ar_pro != htons(ETH_P_IP) ||
2721 arp_ptr = (unsigned char *)(arp + 1);
2722 arp_ptr += bond->dev->addr_len;
2723 memcpy(&sip, arp_ptr, 4);
2724 arp_ptr += 4 + bond->dev->addr_len;
2725 memcpy(&tip, arp_ptr, 4);
2727 pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2728 bond->dev->name, slave->dev->name, bond_slave_state(slave),
2729 bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2733 * Backup slaves won't see the ARP reply, but do come through
2734 * here for each ARP probe (so we swap the sip/tip to validate
2735 * the probe). In a "redundant switch, common router" type of
2736 * configuration, the ARP probe will (hopefully) travel from
2737 * the active, through one switch, the router, then the other
2738 * switch before reaching the backup.
2740 if (bond_is_active_slave(slave))
2741 bond_validate_arp(bond, slave, sip, tip);
2743 bond_validate_arp(bond, slave, tip, sip);
2746 read_unlock(&bond->lock);
2747 if (arp != (struct arphdr *)skb->data)
2749 return RX_HANDLER_ANOTHER;
2753 * this function is called regularly to monitor each slave's link
2754 * ensuring that traffic is being sent and received when arp monitoring
2755 * is used in load-balancing mode. if the adapter has been dormant, then an
2756 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2757 * arp monitoring in active backup mode.
2759 void bond_loadbalance_arp_mon(struct work_struct *work)
2761 struct bonding *bond = container_of(work, struct bonding,
2763 struct slave *slave, *oldcurrent;
2764 int do_failover = 0;
2765 int delta_in_ticks, extra_ticks;
2768 read_lock(&bond->lock);
2770 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2771 extra_ticks = delta_in_ticks / 2;
2773 if (bond->slave_cnt == 0)
2776 read_lock(&bond->curr_slave_lock);
2777 oldcurrent = bond->curr_active_slave;
2778 read_unlock(&bond->curr_slave_lock);
2780 /* see if any of the previous devices are up now (i.e. they have
2781 * xmt and rcv traffic). the curr_active_slave does not come into
2782 * the picture unless it is null. also, slave->jiffies is not needed
2783 * here because we send an arp on each slave and give a slave as
2784 * long as it needs to get the tx/rx within the delta.
2785 * TODO: what about up/down delay in arp mode? it wasn't here before
2788 bond_for_each_slave(bond, slave, i) {
2789 unsigned long trans_start = dev_trans_start(slave->dev);
2791 if (slave->link != BOND_LINK_UP) {
2792 if (time_in_range(jiffies,
2793 trans_start - delta_in_ticks,
2794 trans_start + delta_in_ticks + extra_ticks) &&
2795 time_in_range(jiffies,
2796 slave->dev->last_rx - delta_in_ticks,
2797 slave->dev->last_rx + delta_in_ticks + extra_ticks)) {
2799 slave->link = BOND_LINK_UP;
2800 bond_set_active_slave(slave);
2802 /* primary_slave has no meaning in round-robin
2803 * mode. the window of a slave being up and
2804 * curr_active_slave being null after enslaving
2808 pr_info("%s: link status definitely up for interface %s, ",
2813 pr_info("%s: interface %s is now up\n",
2819 /* slave->link == BOND_LINK_UP */
2821 /* not all switches will respond to an arp request
2822 * when the source ip is 0, so don't take the link down
2823 * if we don't know our ip yet
2825 if (!time_in_range(jiffies,
2826 trans_start - delta_in_ticks,
2827 trans_start + 2 * delta_in_ticks + extra_ticks) ||
2828 !time_in_range(jiffies,
2829 slave->dev->last_rx - delta_in_ticks,
2830 slave->dev->last_rx + 2 * delta_in_ticks + extra_ticks)) {
2832 slave->link = BOND_LINK_DOWN;
2833 bond_set_backup_slave(slave);
2835 if (slave->link_failure_count < UINT_MAX)
2836 slave->link_failure_count++;
2838 pr_info("%s: interface %s is now down.\n",
2842 if (slave == oldcurrent)
2847 /* note: if switch is in round-robin mode, all links
2848 * must tx arp to ensure all links rx an arp - otherwise
2849 * links may oscillate or not come up at all; if switch is
2850 * in something like xor mode, there is nothing we can
2851 * do - all replies will be rx'ed on same link causing slaves
2852 * to be unstable during low/no traffic periods
2854 if (IS_UP(slave->dev))
2855 bond_arp_send_all(bond, slave);
2860 write_lock_bh(&bond->curr_slave_lock);
2862 bond_select_active_slave(bond);
2864 write_unlock_bh(&bond->curr_slave_lock);
2865 unblock_netpoll_tx();
2869 if (bond->params.arp_interval)
2870 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2872 read_unlock(&bond->lock);
2876 * Called to inspect slaves for active-backup mode ARP monitor link state
2877 * changes. Sets new_link in slaves to specify what action should take
2878 * place for the slave. Returns 0 if no changes are found, >0 if changes
2879 * to link states must be committed.
2881 * Called with bond->lock held for read.
2883 static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks)
2885 struct slave *slave;
2887 unsigned long trans_start;
2890 /* All the time comparisons below need some extra time. Otherwise, on
2891 * fast networks the ARP probe/reply may arrive within the same jiffy
2892 * as it was sent. Then, the next time the ARP monitor is run, one
2893 * arp_interval will already have passed in the comparisons.
2895 extra_ticks = delta_in_ticks / 2;
2897 bond_for_each_slave(bond, slave, i) {
2898 slave->new_link = BOND_LINK_NOCHANGE;
2900 if (slave->link != BOND_LINK_UP) {
2901 if (time_in_range(jiffies,
2902 slave_last_rx(bond, slave) - delta_in_ticks,
2903 slave_last_rx(bond, slave) + delta_in_ticks + extra_ticks)) {
2905 slave->new_link = BOND_LINK_UP;
2913 * Give slaves 2*delta after being enslaved or made
2914 * active. This avoids bouncing, as the last receive
2915 * times need a full ARP monitor cycle to be updated.
2917 if (time_in_range(jiffies,
2918 slave->jiffies - delta_in_ticks,
2919 slave->jiffies + 2 * delta_in_ticks + extra_ticks))
2923 * Backup slave is down if:
2924 * - No current_arp_slave AND
2925 * - more than 3*delta since last receive AND
2926 * - the bond has an IP address
2928 * Note: a non-null current_arp_slave indicates
2929 * the curr_active_slave went down and we are
2930 * searching for a new one; under this condition
2931 * we only take the curr_active_slave down - this
2932 * gives each slave a chance to tx/rx traffic
2933 * before being taken out
2935 if (!bond_is_active_slave(slave) &&
2936 !bond->current_arp_slave &&
2937 !time_in_range(jiffies,
2938 slave_last_rx(bond, slave) - delta_in_ticks,
2939 slave_last_rx(bond, slave) + 3 * delta_in_ticks + extra_ticks)) {
2941 slave->new_link = BOND_LINK_DOWN;
2946 * Active slave is down if:
2947 * - more than 2*delta since transmitting OR
2948 * - (more than 2*delta since receive AND
2949 * the bond has an IP address)
2951 trans_start = dev_trans_start(slave->dev);
2952 if (bond_is_active_slave(slave) &&
2953 (!time_in_range(jiffies,
2954 trans_start - delta_in_ticks,
2955 trans_start + 2 * delta_in_ticks + extra_ticks) ||
2956 !time_in_range(jiffies,
2957 slave_last_rx(bond, slave) - delta_in_ticks,
2958 slave_last_rx(bond, slave) + 2 * delta_in_ticks + extra_ticks))) {
2960 slave->new_link = BOND_LINK_DOWN;
2969 * Called to commit link state changes noted by inspection step of
2970 * active-backup mode ARP monitor.
2972 * Called with RTNL and bond->lock for read.
2974 static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks)
2976 struct slave *slave;
2978 unsigned long trans_start;
2980 bond_for_each_slave(bond, slave, i) {
2981 switch (slave->new_link) {
2982 case BOND_LINK_NOCHANGE:
2986 trans_start = dev_trans_start(slave->dev);
2987 if ((!bond->curr_active_slave &&
2988 time_in_range(jiffies,
2989 trans_start - delta_in_ticks,
2990 trans_start + delta_in_ticks + delta_in_ticks / 2)) ||
2991 bond->curr_active_slave != slave) {
2992 slave->link = BOND_LINK_UP;
2993 if (bond->current_arp_slave) {
2994 bond_set_slave_inactive_flags(
2995 bond->current_arp_slave);
2996 bond->current_arp_slave = NULL;
2999 pr_info("%s: link status definitely up for interface %s.\n",
3000 bond->dev->name, slave->dev->name);
3002 if (!bond->curr_active_slave ||
3003 (slave == bond->primary_slave))
3010 case BOND_LINK_DOWN:
3011 if (slave->link_failure_count < UINT_MAX)
3012 slave->link_failure_count++;
3014 slave->link = BOND_LINK_DOWN;
3015 bond_set_slave_inactive_flags(slave);
3017 pr_info("%s: link status definitely down for interface %s, disabling it\n",
3018 bond->dev->name, slave->dev->name);
3020 if (slave == bond->curr_active_slave) {
3021 bond->current_arp_slave = NULL;
3028 pr_err("%s: impossible: new_link %d on slave %s\n",
3029 bond->dev->name, slave->new_link,
3037 write_lock_bh(&bond->curr_slave_lock);
3038 bond_select_active_slave(bond);
3039 write_unlock_bh(&bond->curr_slave_lock);
3040 unblock_netpoll_tx();
3043 bond_set_carrier(bond);
3047 * Send ARP probes for active-backup mode ARP monitor.
3049 * Called with bond->lock held for read.
3051 static void bond_ab_arp_probe(struct bonding *bond)
3053 struct slave *slave;
3056 read_lock(&bond->curr_slave_lock);
3058 if (bond->current_arp_slave && bond->curr_active_slave)
3059 pr_info("PROBE: c_arp %s && cas %s BAD\n",
3060 bond->current_arp_slave->dev->name,
3061 bond->curr_active_slave->dev->name);
3063 if (bond->curr_active_slave) {
3064 bond_arp_send_all(bond, bond->curr_active_slave);
3065 read_unlock(&bond->curr_slave_lock);
3069 read_unlock(&bond->curr_slave_lock);
3071 /* if we don't have a curr_active_slave, search for the next available
3072 * backup slave from the current_arp_slave and make it the candidate
3073 * for becoming the curr_active_slave
3076 if (!bond->current_arp_slave) {
3077 bond->current_arp_slave = bond->first_slave;
3078 if (!bond->current_arp_slave)
3082 bond_set_slave_inactive_flags(bond->current_arp_slave);
3084 /* search for next candidate */
3085 bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
3086 if (IS_UP(slave->dev)) {
3087 slave->link = BOND_LINK_BACK;
3088 bond_set_slave_active_flags(slave);
3089 bond_arp_send_all(bond, slave);
3090 slave->jiffies = jiffies;
3091 bond->current_arp_slave = slave;
3095 /* if the link state is up at this point, we
3096 * mark it down - this can happen if we have
3097 * simultaneous link failures and
3098 * reselect_active_interface doesn't make this
3099 * one the current slave so it is still marked
3100 * up when it is actually down
3102 if (slave->link == BOND_LINK_UP) {
3103 slave->link = BOND_LINK_DOWN;
3104 if (slave->link_failure_count < UINT_MAX)
3105 slave->link_failure_count++;
3107 bond_set_slave_inactive_flags(slave);
3109 pr_info("%s: backup interface %s is now down.\n",
3110 bond->dev->name, slave->dev->name);
3115 void bond_activebackup_arp_mon(struct work_struct *work)
3117 struct bonding *bond = container_of(work, struct bonding,
3119 bool should_notify_peers = false;
3122 read_lock(&bond->lock);
3124 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3126 if (bond->slave_cnt == 0)
3129 should_notify_peers = bond_should_notify_peers(bond);
3131 if (bond_ab_arp_inspect(bond, delta_in_ticks)) {
3132 read_unlock(&bond->lock);
3134 /* Race avoidance with bond_close flush of workqueue */
3135 if (!rtnl_trylock()) {
3136 read_lock(&bond->lock);
3138 should_notify_peers = false;
3142 read_lock(&bond->lock);
3144 bond_ab_arp_commit(bond, delta_in_ticks);
3146 read_unlock(&bond->lock);
3148 read_lock(&bond->lock);
3151 bond_ab_arp_probe(bond);
3154 if (bond->params.arp_interval)
3155 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3157 read_unlock(&bond->lock);
3159 if (should_notify_peers) {
3160 if (!rtnl_trylock()) {
3161 read_lock(&bond->lock);
3162 bond->send_peer_notif++;
3163 read_unlock(&bond->lock);
3166 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
3171 /*-------------------------- netdev event handling --------------------------*/
3174 * Change device name
3176 static int bond_event_changename(struct bonding *bond)
3178 bond_remove_proc_entry(bond);
3179 bond_create_proc_entry(bond);
3181 bond_debug_reregister(bond);
3186 static int bond_master_netdev_event(unsigned long event,
3187 struct net_device *bond_dev)
3189 struct bonding *event_bond = netdev_priv(bond_dev);
3192 case NETDEV_CHANGENAME:
3193 return bond_event_changename(event_bond);
3194 case NETDEV_UNREGISTER:
3195 bond_remove_proc_entry(event_bond);
3197 case NETDEV_REGISTER:
3198 bond_create_proc_entry(event_bond);
3207 static int bond_slave_netdev_event(unsigned long event,
3208 struct net_device *slave_dev)
3210 struct slave *slave = bond_slave_get_rtnl(slave_dev);
3211 struct bonding *bond;
3212 struct net_device *bond_dev;
3216 /* A netdev event can be generated while enslaving a device
3217 * before netdev_rx_handler_register is called in which case
3218 * slave will be NULL
3222 bond_dev = slave->bond->dev;
3226 case NETDEV_UNREGISTER:
3227 if (bond->setup_by_slave)
3228 bond_release_and_destroy(bond_dev, slave_dev);
3230 bond_release(bond_dev, slave_dev);
3234 old_speed = slave->speed;
3235 old_duplex = slave->duplex;
3237 bond_update_speed_duplex(slave);
3239 if (bond->params.mode == BOND_MODE_8023AD) {
3240 if (old_speed != slave->speed)
3241 bond_3ad_adapter_speed_changed(slave);
3242 if (old_duplex != slave->duplex)
3243 bond_3ad_adapter_duplex_changed(slave);
3248 * ... Or is it this?
3251 case NETDEV_CHANGEMTU:
3253 * TODO: Should slaves be allowed to
3254 * independently alter their MTU? For
3255 * an active-backup bond, slaves need
3256 * not be the same type of device, so
3257 * MTUs may vary. For other modes,
3258 * slaves arguably should have the
3259 * same MTUs. To do this, we'd need to
3260 * take over the slave's change_mtu
3261 * function for the duration of their
3265 case NETDEV_CHANGENAME:
3267 * TODO: handle changing the primary's name
3270 case NETDEV_FEAT_CHANGE:
3271 bond_compute_features(bond);
3281 * bond_netdev_event: handle netdev notifier chain events.
3283 * This function receives events for the netdev chain. The caller (an
3284 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3285 * locks for us to safely manipulate the slave devices (RTNL lock,
3288 static int bond_netdev_event(struct notifier_block *this,
3289 unsigned long event, void *ptr)
3291 struct net_device *event_dev = (struct net_device *)ptr;
3293 pr_debug("event_dev: %s, event: %lx\n",
3294 event_dev ? event_dev->name : "None",
3297 if (!(event_dev->priv_flags & IFF_BONDING))
3300 if (event_dev->flags & IFF_MASTER) {
3301 pr_debug("IFF_MASTER\n");
3302 return bond_master_netdev_event(event, event_dev);
3305 if (event_dev->flags & IFF_SLAVE) {
3306 pr_debug("IFF_SLAVE\n");
3307 return bond_slave_netdev_event(event, event_dev);
3313 static struct notifier_block bond_netdev_notifier = {
3314 .notifier_call = bond_netdev_event,
3317 /*---------------------------- Hashing Policies -----------------------------*/
3320 * Hash for the output device based upon layer 2 data
3322 static int bond_xmit_hash_policy_l2(struct sk_buff *skb, int count)
3324 struct ethhdr *data = (struct ethhdr *)skb->data;
3326 if (skb_headlen(skb) >= offsetof(struct ethhdr, h_proto))
3327 return (data->h_dest[5] ^ data->h_source[5]) % count;
3333 * Hash for the output device based upon layer 2 and layer 3 data. If
3334 * the packet is not IP, fall back on bond_xmit_hash_policy_l2()
3336 static int bond_xmit_hash_policy_l23(struct sk_buff *skb, int count)
3338 const struct ethhdr *data;
3339 const struct iphdr *iph;
3340 const struct ipv6hdr *ipv6h;
3342 const __be32 *s, *d;
3344 if (skb->protocol == htons(ETH_P_IP) &&
3345 pskb_network_may_pull(skb, sizeof(*iph))) {
3347 data = (struct ethhdr *)skb->data;
3348 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^
3349 (data->h_dest[5] ^ data->h_source[5])) % count;
3350 } else if (skb->protocol == htons(ETH_P_IPV6) &&
3351 pskb_network_may_pull(skb, sizeof(*ipv6h))) {
3352 ipv6h = ipv6_hdr(skb);
3353 data = (struct ethhdr *)skb->data;
3354 s = &ipv6h->saddr.s6_addr32[0];
3355 d = &ipv6h->daddr.s6_addr32[0];
3356 v6hash = (s[1] ^ d[1]) ^ (s[2] ^ d[2]) ^ (s[3] ^ d[3]);
3357 v6hash ^= (v6hash >> 24) ^ (v6hash >> 16) ^ (v6hash >> 8);
3358 return (v6hash ^ data->h_dest[5] ^ data->h_source[5]) % count;
3361 return bond_xmit_hash_policy_l2(skb, count);
3365 * Hash for the output device based upon layer 3 and layer 4 data. If
3366 * the packet is a frag or not TCP or UDP, just use layer 3 data. If it is
3367 * altogether not IP, fall back on bond_xmit_hash_policy_l2()
3369 static int bond_xmit_hash_policy_l34(struct sk_buff *skb, int count)
3372 const struct iphdr *iph;
3373 const struct ipv6hdr *ipv6h;
3374 const __be32 *s, *d;
3375 const __be16 *l4 = NULL;
3377 int noff = skb_network_offset(skb);
3380 if (skb->protocol == htons(ETH_P_IP) &&
3381 pskb_may_pull(skb, noff + sizeof(*iph))) {
3383 poff = proto_ports_offset(iph->protocol);
3385 if (!ip_is_fragment(iph) && poff >= 0) {
3386 l4 = skb_header_pointer(skb, noff + (iph->ihl << 2) + poff,
3389 layer4_xor = ntohs(l4[0] ^ l4[1]);
3391 return (layer4_xor ^
3392 ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3393 } else if (skb->protocol == htons(ETH_P_IPV6) &&
3394 pskb_may_pull(skb, noff + sizeof(*ipv6h))) {
3395 ipv6h = ipv6_hdr(skb);
3396 poff = proto_ports_offset(ipv6h->nexthdr);
3398 l4 = skb_header_pointer(skb, noff + sizeof(*ipv6h) + poff,
3401 layer4_xor = ntohs(l4[0] ^ l4[1]);
3403 s = &ipv6h->saddr.s6_addr32[0];
3404 d = &ipv6h->daddr.s6_addr32[0];
3405 layer4_xor ^= (s[1] ^ d[1]) ^ (s[2] ^ d[2]) ^ (s[3] ^ d[3]);
3406 layer4_xor ^= (layer4_xor >> 24) ^ (layer4_xor >> 16) ^
3408 return layer4_xor % count;
3411 return bond_xmit_hash_policy_l2(skb, count);
3414 /*-------------------------- Device entry points ----------------------------*/
3416 static void bond_work_init_all(struct bonding *bond)
3418 INIT_DELAYED_WORK(&bond->mcast_work,
3419 bond_resend_igmp_join_requests_delayed);
3420 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3421 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3422 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3423 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon);
3425 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon);
3426 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3429 static void bond_work_cancel_all(struct bonding *bond)
3431 cancel_delayed_work_sync(&bond->mii_work);
3432 cancel_delayed_work_sync(&bond->arp_work);
3433 cancel_delayed_work_sync(&bond->alb_work);
3434 cancel_delayed_work_sync(&bond->ad_work);
3435 cancel_delayed_work_sync(&bond->mcast_work);
3438 static int bond_open(struct net_device *bond_dev)
3440 struct bonding *bond = netdev_priv(bond_dev);
3441 struct slave *slave;
3444 /* reset slave->backup and slave->inactive */
3445 read_lock(&bond->lock);
3446 if (bond->slave_cnt > 0) {
3447 read_lock(&bond->curr_slave_lock);
3448 bond_for_each_slave(bond, slave, i) {
3449 if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3450 && (slave != bond->curr_active_slave)) {
3451 bond_set_slave_inactive_flags(slave);
3453 bond_set_slave_active_flags(slave);
3456 read_unlock(&bond->curr_slave_lock);
3458 read_unlock(&bond->lock);
3460 bond_work_init_all(bond);
3462 if (bond_is_lb(bond)) {
3463 /* bond_alb_initialize must be called before the timer
3466 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB)))
3468 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3471 if (bond->params.miimon) /* link check interval, in milliseconds. */
3472 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3474 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3475 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3476 if (bond->params.arp_validate)
3477 bond->recv_probe = bond_arp_rcv;
3480 if (bond->params.mode == BOND_MODE_8023AD) {
3481 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3482 /* register to receive LACPDUs */
3483 bond->recv_probe = bond_3ad_lacpdu_recv;
3484 bond_3ad_initiate_agg_selection(bond, 1);
3490 static int bond_close(struct net_device *bond_dev)
3492 struct bonding *bond = netdev_priv(bond_dev);
3494 write_lock_bh(&bond->lock);
3495 bond->send_peer_notif = 0;
3496 write_unlock_bh(&bond->lock);
3498 bond_work_cancel_all(bond);
3499 if (bond_is_lb(bond)) {
3500 /* Must be called only after all
3501 * slaves have been released
3503 bond_alb_deinitialize(bond);
3505 bond->recv_probe = NULL;
3510 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3511 struct rtnl_link_stats64 *stats)
3513 struct bonding *bond = netdev_priv(bond_dev);
3514 struct rtnl_link_stats64 temp;
3515 struct slave *slave;
3518 memset(stats, 0, sizeof(*stats));
3520 read_lock_bh(&bond->lock);
3522 bond_for_each_slave(bond, slave, i) {
3523 const struct rtnl_link_stats64 *sstats =
3524 dev_get_stats(slave->dev, &temp);
3526 stats->rx_packets += sstats->rx_packets;
3527 stats->rx_bytes += sstats->rx_bytes;
3528 stats->rx_errors += sstats->rx_errors;
3529 stats->rx_dropped += sstats->rx_dropped;
3531 stats->tx_packets += sstats->tx_packets;
3532 stats->tx_bytes += sstats->tx_bytes;
3533 stats->tx_errors += sstats->tx_errors;
3534 stats->tx_dropped += sstats->tx_dropped;
3536 stats->multicast += sstats->multicast;
3537 stats->collisions += sstats->collisions;
3539 stats->rx_length_errors += sstats->rx_length_errors;
3540 stats->rx_over_errors += sstats->rx_over_errors;
3541 stats->rx_crc_errors += sstats->rx_crc_errors;
3542 stats->rx_frame_errors += sstats->rx_frame_errors;
3543 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3544 stats->rx_missed_errors += sstats->rx_missed_errors;
3546 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3547 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3548 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3549 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3550 stats->tx_window_errors += sstats->tx_window_errors;
3553 read_unlock_bh(&bond->lock);
3558 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3560 struct net_device *slave_dev = NULL;
3561 struct ifbond k_binfo;
3562 struct ifbond __user *u_binfo = NULL;
3563 struct ifslave k_sinfo;
3564 struct ifslave __user *u_sinfo = NULL;
3565 struct mii_ioctl_data *mii = NULL;
3569 pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd);
3581 * We do this again just in case we were called by SIOCGMIIREG
3582 * instead of SIOCGMIIPHY.
3589 if (mii->reg_num == 1) {
3590 struct bonding *bond = netdev_priv(bond_dev);
3592 read_lock(&bond->lock);
3593 read_lock(&bond->curr_slave_lock);
3594 if (netif_carrier_ok(bond->dev))
3595 mii->val_out = BMSR_LSTATUS;
3597 read_unlock(&bond->curr_slave_lock);
3598 read_unlock(&bond->lock);
3602 case BOND_INFO_QUERY_OLD:
3603 case SIOCBONDINFOQUERY:
3604 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3606 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3609 res = bond_info_query(bond_dev, &k_binfo);
3611 copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3615 case BOND_SLAVE_INFO_QUERY_OLD:
3616 case SIOCBONDSLAVEINFOQUERY:
3617 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3619 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3622 res = bond_slave_info_query(bond_dev, &k_sinfo);
3624 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3633 net = dev_net(bond_dev);
3635 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3638 slave_dev = dev_get_by_name(net, ifr->ifr_slave);
3640 pr_debug("slave_dev=%p:\n", slave_dev);
3645 pr_debug("slave_dev->name=%s:\n", slave_dev->name);
3647 case BOND_ENSLAVE_OLD:
3648 case SIOCBONDENSLAVE:
3649 res = bond_enslave(bond_dev, slave_dev);
3651 case BOND_RELEASE_OLD:
3652 case SIOCBONDRELEASE:
3653 res = bond_release(bond_dev, slave_dev);
3655 case BOND_SETHWADDR_OLD:
3656 case SIOCBONDSETHWADDR:
3657 bond_set_dev_addr(bond_dev, slave_dev);
3660 case BOND_CHANGE_ACTIVE_OLD:
3661 case SIOCBONDCHANGEACTIVE:
3662 res = bond_ioctl_change_active(bond_dev, slave_dev);
3674 static bool bond_addr_in_mc_list(unsigned char *addr,
3675 struct netdev_hw_addr_list *list,
3678 struct netdev_hw_addr *ha;
3680 netdev_hw_addr_list_for_each(ha, list)
3681 if (!memcmp(ha->addr, addr, addrlen))
3687 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3689 struct bonding *bond = netdev_priv(bond_dev);
3691 if (change & IFF_PROMISC)
3692 bond_set_promiscuity(bond,
3693 bond_dev->flags & IFF_PROMISC ? 1 : -1);
3695 if (change & IFF_ALLMULTI)
3696 bond_set_allmulti(bond,
3697 bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3700 static void bond_set_multicast_list(struct net_device *bond_dev)
3702 struct bonding *bond = netdev_priv(bond_dev);
3703 struct netdev_hw_addr *ha;
3706 read_lock(&bond->lock);
3708 /* looking for addresses to add to slaves' mc list */
3709 netdev_for_each_mc_addr(ha, bond_dev) {
3710 found = bond_addr_in_mc_list(ha->addr, &bond->mc_list,
3711 bond_dev->addr_len);
3713 bond_mc_add(bond, ha->addr);
3716 /* looking for addresses to delete from slaves' list */
3717 netdev_hw_addr_list_for_each(ha, &bond->mc_list) {
3718 found = bond_addr_in_mc_list(ha->addr, &bond_dev->mc,
3719 bond_dev->addr_len);
3721 bond_mc_del(bond, ha->addr);
3724 /* save master's multicast list */
3725 __hw_addr_flush(&bond->mc_list);
3726 __hw_addr_add_multiple(&bond->mc_list, &bond_dev->mc,
3727 bond_dev->addr_len, NETDEV_HW_ADDR_T_MULTICAST);
3729 read_unlock(&bond->lock);
3732 static int bond_neigh_init(struct neighbour *n)
3734 struct bonding *bond = netdev_priv(n->dev);
3735 struct slave *slave = bond->first_slave;
3736 const struct net_device_ops *slave_ops;
3737 struct neigh_parms parms;
3743 slave_ops = slave->dev->netdev_ops;
3745 if (!slave_ops->ndo_neigh_setup)
3748 parms.neigh_setup = NULL;
3749 parms.neigh_cleanup = NULL;
3750 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3755 * Assign slave's neigh_cleanup to neighbour in case cleanup is called
3756 * after the last slave has been detached. Assumes that all slaves
3757 * utilize the same neigh_cleanup (true at this writing as only user
3760 n->parms->neigh_cleanup = parms.neigh_cleanup;
3762 if (!parms.neigh_setup)
3765 return parms.neigh_setup(n);
3769 * The bonding ndo_neigh_setup is called at init time beofre any
3770 * slave exists. So we must declare proxy setup function which will
3771 * be used at run time to resolve the actual slave neigh param setup.
3773 static int bond_neigh_setup(struct net_device *dev,
3774 struct neigh_parms *parms)
3776 parms->neigh_setup = bond_neigh_init;
3782 * Change the MTU of all of a master's slaves to match the master
3784 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3786 struct bonding *bond = netdev_priv(bond_dev);
3787 struct slave *slave, *stop_at;
3791 pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond,
3792 (bond_dev ? bond_dev->name : "None"), new_mtu);
3794 /* Can't hold bond->lock with bh disabled here since
3795 * some base drivers panic. On the other hand we can't
3796 * hold bond->lock without bh disabled because we'll
3797 * deadlock. The only solution is to rely on the fact
3798 * that we're under rtnl_lock here, and the slaves
3799 * list won't change. This doesn't solve the problem
3800 * of setting the slave's MTU while it is
3801 * transmitting, but the assumption is that the base
3802 * driver can handle that.
3804 * TODO: figure out a way to safely iterate the slaves
3805 * list, but without holding a lock around the actual
3806 * call to the base driver.
3809 bond_for_each_slave(bond, slave, i) {
3810 pr_debug("s %p s->p %p c_m %p\n",
3813 slave->dev->netdev_ops->ndo_change_mtu);
3815 res = dev_set_mtu(slave->dev, new_mtu);
3818 /* If we failed to set the slave's mtu to the new value
3819 * we must abort the operation even in ACTIVE_BACKUP
3820 * mode, because if we allow the backup slaves to have
3821 * different mtu values than the active slave we'll
3822 * need to change their mtu when doing a failover. That
3823 * means changing their mtu from timer context, which
3824 * is probably not a good idea.
3826 pr_debug("err %d %s\n", res, slave->dev->name);
3831 bond_dev->mtu = new_mtu;
3836 /* unwind from head to the slave that failed */
3838 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3841 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
3843 pr_debug("unwind err %d dev %s\n",
3844 tmp_res, slave->dev->name);
3854 * Note that many devices must be down to change the HW address, and
3855 * downing the master releases all slaves. We can make bonds full of
3856 * bonding devices to test this, however.
3858 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3860 struct bonding *bond = netdev_priv(bond_dev);
3861 struct sockaddr *sa = addr, tmp_sa;
3862 struct slave *slave, *stop_at;
3866 if (bond->params.mode == BOND_MODE_ALB)
3867 return bond_alb_set_mac_address(bond_dev, addr);
3870 pr_debug("bond=%p, name=%s\n",
3871 bond, bond_dev ? bond_dev->name : "None");
3874 * If fail_over_mac is set to active, do nothing and return
3875 * success. Returning an error causes ifenslave to fail.
3877 if (bond->params.fail_over_mac == BOND_FOM_ACTIVE)
3880 if (!is_valid_ether_addr(sa->sa_data))
3881 return -EADDRNOTAVAIL;
3883 /* Can't hold bond->lock with bh disabled here since
3884 * some base drivers panic. On the other hand we can't
3885 * hold bond->lock without bh disabled because we'll
3886 * deadlock. The only solution is to rely on the fact
3887 * that we're under rtnl_lock here, and the slaves
3888 * list won't change. This doesn't solve the problem
3889 * of setting the slave's hw address while it is
3890 * transmitting, but the assumption is that the base
3891 * driver can handle that.
3893 * TODO: figure out a way to safely iterate the slaves
3894 * list, but without holding a lock around the actual
3895 * call to the base driver.
3898 bond_for_each_slave(bond, slave, i) {
3899 const struct net_device_ops *slave_ops = slave->dev->netdev_ops;
3900 pr_debug("slave %p %s\n", slave, slave->dev->name);
3902 if (slave_ops->ndo_set_mac_address == NULL) {
3904 pr_debug("EOPNOTSUPP %s\n", slave->dev->name);
3908 res = dev_set_mac_address(slave->dev, addr);
3910 /* TODO: consider downing the slave
3912 * User should expect communications
3913 * breakage anyway until ARP finish
3916 pr_debug("err %d %s\n", res, slave->dev->name);
3922 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3926 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3927 tmp_sa.sa_family = bond_dev->type;
3929 /* unwind from head to the slave that failed */
3931 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3934 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
3936 pr_debug("unwind err %d dev %s\n",
3937 tmp_res, slave->dev->name);
3944 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3946 struct bonding *bond = netdev_priv(bond_dev);
3947 struct slave *slave, *start_at;
3948 int i, slave_no, res = 1;
3949 struct iphdr *iph = ip_hdr(skb);
3952 * Start with the curr_active_slave that joined the bond as the
3953 * default for sending IGMP traffic. For failover purposes one
3954 * needs to maintain some consistency for the interface that will
3955 * send the join/membership reports. The curr_active_slave found
3956 * will send all of this type of traffic.
3958 if ((iph->protocol == IPPROTO_IGMP) &&
3959 (skb->protocol == htons(ETH_P_IP))) {
3961 read_lock(&bond->curr_slave_lock);
3962 slave = bond->curr_active_slave;
3963 read_unlock(&bond->curr_slave_lock);
3969 * Concurrent TX may collide on rr_tx_counter; we accept
3970 * that as being rare enough not to justify using an
3973 slave_no = bond->rr_tx_counter++ % bond->slave_cnt;
3975 bond_for_each_slave(bond, slave, i) {
3983 bond_for_each_slave_from(bond, slave, i, start_at) {
3984 if (IS_UP(slave->dev) &&
3985 (slave->link == BOND_LINK_UP) &&
3986 bond_is_active_slave(slave)) {
3987 res = bond_dev_queue_xmit(bond, skb, slave->dev);
3994 /* no suitable interface, frame not sent */
3998 return NETDEV_TX_OK;
4003 * in active-backup mode, we know that bond->curr_active_slave is always valid if
4004 * the bond has a usable interface.
4006 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
4008 struct bonding *bond = netdev_priv(bond_dev);
4011 read_lock(&bond->curr_slave_lock);
4013 if (bond->curr_active_slave)
4014 res = bond_dev_queue_xmit(bond, skb,
4015 bond->curr_active_slave->dev);
4017 read_unlock(&bond->curr_slave_lock);
4020 /* no suitable interface, frame not sent */
4023 return NETDEV_TX_OK;
4027 * In bond_xmit_xor() , we determine the output device by using a pre-
4028 * determined xmit_hash_policy(), If the selected device is not enabled,
4029 * find the next active slave.
4031 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
4033 struct bonding *bond = netdev_priv(bond_dev);
4034 struct slave *slave, *start_at;
4039 slave_no = bond->xmit_hash_policy(skb, bond->slave_cnt);
4041 bond_for_each_slave(bond, slave, i) {
4049 bond_for_each_slave_from(bond, slave, i, start_at) {
4050 if (IS_UP(slave->dev) &&
4051 (slave->link == BOND_LINK_UP) &&
4052 bond_is_active_slave(slave)) {
4053 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4059 /* no suitable interface, frame not sent */
4063 return NETDEV_TX_OK;
4067 * in broadcast mode, we send everything to all usable interfaces.
4069 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4071 struct bonding *bond = netdev_priv(bond_dev);
4072 struct slave *slave, *start_at;
4073 struct net_device *tx_dev = NULL;
4077 read_lock(&bond->curr_slave_lock);
4078 start_at = bond->curr_active_slave;
4079 read_unlock(&bond->curr_slave_lock);
4084 bond_for_each_slave_from(bond, slave, i, start_at) {
4085 if (IS_UP(slave->dev) &&
4086 (slave->link == BOND_LINK_UP) &&
4087 bond_is_active_slave(slave)) {
4089 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4091 pr_err("%s: Error: bond_xmit_broadcast(): skb_clone() failed\n",
4096 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4102 tx_dev = slave->dev;
4107 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4111 /* no suitable interface, frame not sent */
4114 /* frame sent to all suitable interfaces */
4115 return NETDEV_TX_OK;
4118 /*------------------------- Device initialization ---------------------------*/
4120 static void bond_set_xmit_hash_policy(struct bonding *bond)
4122 switch (bond->params.xmit_policy) {
4123 case BOND_XMIT_POLICY_LAYER23:
4124 bond->xmit_hash_policy = bond_xmit_hash_policy_l23;
4126 case BOND_XMIT_POLICY_LAYER34:
4127 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4129 case BOND_XMIT_POLICY_LAYER2:
4131 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4137 * Lookup the slave that corresponds to a qid
4139 static inline int bond_slave_override(struct bonding *bond,
4140 struct sk_buff *skb)
4143 struct slave *slave = NULL;
4144 struct slave *check_slave;
4146 if (!skb->queue_mapping)
4149 /* Find out if any slaves have the same mapping as this skb. */
4150 bond_for_each_slave(bond, check_slave, i) {
4151 if (check_slave->queue_id == skb->queue_mapping) {
4152 slave = check_slave;
4157 /* If the slave isn't UP, use default transmit policy. */
4158 if (slave && slave->queue_id && IS_UP(slave->dev) &&
4159 (slave->link == BOND_LINK_UP)) {
4160 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4167 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb)
4170 * This helper function exists to help dev_pick_tx get the correct
4171 * destination queue. Using a helper function skips a call to
4172 * skb_tx_hash and will put the skbs in the queue we expect on their
4173 * way down to the bonding driver.
4175 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
4178 * Save the original txq to restore before passing to the driver
4180 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
4182 if (unlikely(txq >= dev->real_num_tx_queues)) {
4184 txq -= dev->real_num_tx_queues;
4185 } while (txq >= dev->real_num_tx_queues);
4190 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4192 struct bonding *bond = netdev_priv(dev);
4194 if (TX_QUEUE_OVERRIDE(bond->params.mode)) {
4195 if (!bond_slave_override(bond, skb))
4196 return NETDEV_TX_OK;
4199 switch (bond->params.mode) {
4200 case BOND_MODE_ROUNDROBIN:
4201 return bond_xmit_roundrobin(skb, dev);
4202 case BOND_MODE_ACTIVEBACKUP:
4203 return bond_xmit_activebackup(skb, dev);
4205 return bond_xmit_xor(skb, dev);
4206 case BOND_MODE_BROADCAST:
4207 return bond_xmit_broadcast(skb, dev);
4208 case BOND_MODE_8023AD:
4209 return bond_3ad_xmit_xor(skb, dev);
4212 return bond_alb_xmit(skb, dev);
4214 /* Should never happen, mode already checked */
4215 pr_err("%s: Error: Unknown bonding mode %d\n",
4216 dev->name, bond->params.mode);
4219 return NETDEV_TX_OK;
4223 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4225 struct bonding *bond = netdev_priv(dev);
4226 netdev_tx_t ret = NETDEV_TX_OK;
4229 * If we risk deadlock from transmitting this in the
4230 * netpoll path, tell netpoll to queue the frame for later tx
4232 if (is_netpoll_tx_blocked(dev))
4233 return NETDEV_TX_BUSY;
4235 read_lock(&bond->lock);
4237 if (bond->slave_cnt)
4238 ret = __bond_start_xmit(skb, dev);
4242 read_unlock(&bond->lock);
4248 * set bond mode specific net device operations
4250 void bond_set_mode_ops(struct bonding *bond, int mode)
4252 struct net_device *bond_dev = bond->dev;
4255 case BOND_MODE_ROUNDROBIN:
4257 case BOND_MODE_ACTIVEBACKUP:
4260 bond_set_xmit_hash_policy(bond);
4262 case BOND_MODE_BROADCAST:
4264 case BOND_MODE_8023AD:
4265 bond_set_xmit_hash_policy(bond);
4272 /* Should never happen, mode already checked */
4273 pr_err("%s: Error: Unknown bonding mode %d\n",
4274 bond_dev->name, mode);
4279 static int bond_ethtool_get_settings(struct net_device *bond_dev,
4280 struct ethtool_cmd *ecmd)
4282 struct bonding *bond = netdev_priv(bond_dev);
4283 struct slave *slave;
4285 unsigned long speed = 0;
4287 ecmd->duplex = DUPLEX_UNKNOWN;
4288 ecmd->port = PORT_OTHER;
4290 /* Since SLAVE_IS_OK returns false for all inactive or down slaves, we
4291 * do not need to check mode. Though link speed might not represent
4292 * the true receive or transmit bandwidth (not all modes are symmetric)
4293 * this is an accurate maximum.
4295 read_lock(&bond->lock);
4296 bond_for_each_slave(bond, slave, i) {
4297 if (SLAVE_IS_OK(slave)) {
4298 if (slave->speed != SPEED_UNKNOWN)
4299 speed += slave->speed;
4300 if (ecmd->duplex == DUPLEX_UNKNOWN &&
4301 slave->duplex != DUPLEX_UNKNOWN)
4302 ecmd->duplex = slave->duplex;
4305 ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN);
4306 read_unlock(&bond->lock);
4310 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4311 struct ethtool_drvinfo *drvinfo)
4313 strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
4314 strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
4315 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
4319 static const struct ethtool_ops bond_ethtool_ops = {
4320 .get_drvinfo = bond_ethtool_get_drvinfo,
4321 .get_settings = bond_ethtool_get_settings,
4322 .get_link = ethtool_op_get_link,
4325 static const struct net_device_ops bond_netdev_ops = {
4326 .ndo_init = bond_init,
4327 .ndo_uninit = bond_uninit,
4328 .ndo_open = bond_open,
4329 .ndo_stop = bond_close,
4330 .ndo_start_xmit = bond_start_xmit,
4331 .ndo_select_queue = bond_select_queue,
4332 .ndo_get_stats64 = bond_get_stats,
4333 .ndo_do_ioctl = bond_do_ioctl,
4334 .ndo_change_rx_flags = bond_change_rx_flags,
4335 .ndo_set_rx_mode = bond_set_multicast_list,
4336 .ndo_change_mtu = bond_change_mtu,
4337 .ndo_set_mac_address = bond_set_mac_address,
4338 .ndo_neigh_setup = bond_neigh_setup,
4339 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid,
4340 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid,
4341 #ifdef CONFIG_NET_POLL_CONTROLLER
4342 .ndo_netpoll_setup = bond_netpoll_setup,
4343 .ndo_netpoll_cleanup = bond_netpoll_cleanup,
4344 .ndo_poll_controller = bond_poll_controller,
4346 .ndo_add_slave = bond_enslave,
4347 .ndo_del_slave = bond_release,
4348 .ndo_fix_features = bond_fix_features,
4351 static const struct device_type bond_type = {
4355 static void bond_destructor(struct net_device *bond_dev)
4357 struct bonding *bond = netdev_priv(bond_dev);
4359 destroy_workqueue(bond->wq);
4360 free_netdev(bond_dev);
4363 static void bond_setup(struct net_device *bond_dev)
4365 struct bonding *bond = netdev_priv(bond_dev);
4367 /* initialize rwlocks */
4368 rwlock_init(&bond->lock);
4369 rwlock_init(&bond->curr_slave_lock);
4371 bond->params = bonding_defaults;
4373 /* Initialize pointers */
4374 bond->dev = bond_dev;
4375 INIT_LIST_HEAD(&bond->vlan_list);
4377 /* Initialize the device entry points */
4378 ether_setup(bond_dev);
4379 bond_dev->netdev_ops = &bond_netdev_ops;
4380 bond_dev->ethtool_ops = &bond_ethtool_ops;
4381 bond_set_mode_ops(bond, bond->params.mode);
4383 bond_dev->destructor = bond_destructor;
4385 SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
4387 /* Initialize the device options */
4388 bond_dev->tx_queue_len = 0;
4389 bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4390 bond_dev->priv_flags |= IFF_BONDING;
4391 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4393 /* At first, we block adding VLANs. That's the only way to
4394 * prevent problems that occur when adding VLANs over an
4395 * empty bond. The block will be removed once non-challenged
4396 * slaves are enslaved.
4398 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4400 /* don't acquire bond device's netif_tx_lock when
4402 bond_dev->features |= NETIF_F_LLTX;
4404 /* By default, we declare the bond to be fully
4405 * VLAN hardware accelerated capable. Special
4406 * care is taken in the various xmit functions
4407 * when there are slaves that are not hw accel
4411 bond_dev->hw_features = BOND_VLAN_FEATURES |
4412 NETIF_F_HW_VLAN_CTAG_TX |
4413 NETIF_F_HW_VLAN_CTAG_RX |
4414 NETIF_F_HW_VLAN_CTAG_FILTER;
4416 bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM);
4417 bond_dev->features |= bond_dev->hw_features;
4421 * Destroy a bonding device.
4422 * Must be under rtnl_lock when this function is called.
4424 static void bond_uninit(struct net_device *bond_dev)
4426 struct bonding *bond = netdev_priv(bond_dev);
4427 struct vlan_entry *vlan, *tmp;
4429 bond_netpoll_cleanup(bond_dev);
4431 /* Release the bonded slaves */
4432 while (bond->first_slave != NULL)
4433 __bond_release_one(bond_dev, bond->first_slave->dev, true);
4434 pr_info("%s: released all slaves\n", bond_dev->name);
4436 list_del(&bond->bond_list);
4438 bond_debug_unregister(bond);
4440 __hw_addr_flush(&bond->mc_list);
4442 list_for_each_entry_safe(vlan, tmp, &bond->vlan_list, vlan_list) {
4443 list_del(&vlan->vlan_list);
4448 /*------------------------- Module initialization ---------------------------*/
4451 * Convert string input module parms. Accept either the
4452 * number of the mode or its string name. A bit complicated because
4453 * some mode names are substrings of other names, and calls from sysfs
4454 * may have whitespace in the name (trailing newlines, for example).
4456 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl)
4458 int modeint = -1, i, rv;
4459 char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, };
4461 for (p = (char *)buf; *p; p++)
4462 if (!(isdigit(*p) || isspace(*p)))
4466 rv = sscanf(buf, "%20s", modestr);
4468 rv = sscanf(buf, "%d", &modeint);
4473 for (i = 0; tbl[i].modename; i++) {
4474 if (modeint == tbl[i].mode)
4476 if (strcmp(modestr, tbl[i].modename) == 0)
4483 static int bond_check_params(struct bond_params *params)
4485 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4488 * Convert string parameters.
4491 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4492 if (bond_mode == -1) {
4493 pr_err("Error: Invalid bonding mode \"%s\"\n",
4494 mode == NULL ? "NULL" : mode);
4499 if (xmit_hash_policy) {
4500 if ((bond_mode != BOND_MODE_XOR) &&
4501 (bond_mode != BOND_MODE_8023AD)) {
4502 pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4503 bond_mode_name(bond_mode));
4505 xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4507 if (xmit_hashtype == -1) {
4508 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4509 xmit_hash_policy == NULL ? "NULL" :
4517 if (bond_mode != BOND_MODE_8023AD) {
4518 pr_info("lacp_rate param is irrelevant in mode %s\n",
4519 bond_mode_name(bond_mode));
4521 lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4522 if (lacp_fast == -1) {
4523 pr_err("Error: Invalid lacp rate \"%s\"\n",
4524 lacp_rate == NULL ? "NULL" : lacp_rate);
4531 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl);
4532 if (params->ad_select == -1) {
4533 pr_err("Error: Invalid ad_select \"%s\"\n",
4534 ad_select == NULL ? "NULL" : ad_select);
4538 if (bond_mode != BOND_MODE_8023AD) {
4539 pr_warning("ad_select param only affects 802.3ad mode\n");
4542 params->ad_select = BOND_AD_STABLE;
4545 if (max_bonds < 0) {
4546 pr_warning("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4547 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4548 max_bonds = BOND_DEFAULT_MAX_BONDS;
4552 pr_warning("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to %d\n",
4553 miimon, INT_MAX, BOND_LINK_MON_INTERV);
4554 miimon = BOND_LINK_MON_INTERV;
4558 pr_warning("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4563 if (downdelay < 0) {
4564 pr_warning("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4565 downdelay, INT_MAX);
4569 if ((use_carrier != 0) && (use_carrier != 1)) {
4570 pr_warning("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4575 if (num_peer_notif < 0 || num_peer_notif > 255) {
4576 pr_warning("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4581 /* reset values for 802.3ad */
4582 if (bond_mode == BOND_MODE_8023AD) {
4584 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");
4585 pr_warning("Forcing miimon to 100msec\n");
4590 if (tx_queues < 1 || tx_queues > 255) {
4591 pr_warning("Warning: tx_queues (%d) should be between "
4592 "1 and 255, resetting to %d\n",
4593 tx_queues, BOND_DEFAULT_TX_QUEUES);
4594 tx_queues = BOND_DEFAULT_TX_QUEUES;
4597 if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4598 pr_warning("Warning: all_slaves_active module parameter (%d), "
4599 "not of valid value (0/1), so it was set to "
4600 "0\n", all_slaves_active);
4601 all_slaves_active = 0;
4604 if (resend_igmp < 0 || resend_igmp > 255) {
4605 pr_warning("Warning: resend_igmp (%d) should be between "
4606 "0 and 255, resetting to %d\n",
4607 resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4608 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4611 /* reset values for TLB/ALB */
4612 if ((bond_mode == BOND_MODE_TLB) ||
4613 (bond_mode == BOND_MODE_ALB)) {
4615 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");
4616 pr_warning("Forcing miimon to 100msec\n");
4621 if (bond_mode == BOND_MODE_ALB) {
4622 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",
4627 if (updelay || downdelay) {
4628 /* just warn the user the up/down delay will have
4629 * no effect since miimon is zero...
4631 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",
4632 updelay, downdelay);
4635 /* don't allow arp monitoring */
4637 pr_warning("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4638 miimon, arp_interval);
4642 if ((updelay % miimon) != 0) {
4643 pr_warning("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4645 (updelay / miimon) * miimon);
4650 if ((downdelay % miimon) != 0) {
4651 pr_warning("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4653 (downdelay / miimon) * miimon);
4656 downdelay /= miimon;
4659 if (arp_interval < 0) {
4660 pr_warning("Warning: arp_interval module parameter (%d) , not in range 0-%d, so it was reset to %d\n",
4661 arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4662 arp_interval = BOND_LINK_ARP_INTERV;
4665 for (arp_ip_count = 0, i = 0;
4666 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4667 /* not complete check, but should be good enough to
4669 __be32 ip = in_aton(arp_ip_target[i]);
4670 if (!isdigit(arp_ip_target[i][0]) || ip == 0 ||
4671 ip == htonl(INADDR_BROADCAST)) {
4672 pr_warning("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4676 arp_target[arp_ip_count++] = ip;
4680 if (arp_interval && !arp_ip_count) {
4681 /* don't allow arping if no arp_ip_target given... */
4682 pr_warning("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4688 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4689 pr_err("arp_validate only supported in active-backup mode\n");
4692 if (!arp_interval) {
4693 pr_err("arp_validate requires arp_interval\n");
4697 arp_validate_value = bond_parse_parm(arp_validate,
4699 if (arp_validate_value == -1) {
4700 pr_err("Error: invalid arp_validate \"%s\"\n",
4701 arp_validate == NULL ? "NULL" : arp_validate);
4705 arp_validate_value = 0;
4708 pr_info("MII link monitoring set to %d ms\n", miimon);
4709 } else if (arp_interval) {
4710 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4712 arp_validate_tbl[arp_validate_value].modename,
4715 for (i = 0; i < arp_ip_count; i++)
4716 pr_info(" %s", arp_ip_target[i]);
4720 } else if (max_bonds) {
4721 /* miimon and arp_interval not set, we need one so things
4722 * work as expected, see bonding.txt for details
4724 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");
4727 if (primary && !USES_PRIMARY(bond_mode)) {
4728 /* currently, using a primary only makes sense
4729 * in active backup, TLB or ALB modes
4731 pr_warning("Warning: %s primary device specified but has no effect in %s mode\n",
4732 primary, bond_mode_name(bond_mode));
4736 if (primary && primary_reselect) {
4737 primary_reselect_value = bond_parse_parm(primary_reselect,
4739 if (primary_reselect_value == -1) {
4740 pr_err("Error: Invalid primary_reselect \"%s\"\n",
4742 NULL ? "NULL" : primary_reselect);
4746 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4749 if (fail_over_mac) {
4750 fail_over_mac_value = bond_parse_parm(fail_over_mac,
4752 if (fail_over_mac_value == -1) {
4753 pr_err("Error: invalid fail_over_mac \"%s\"\n",
4754 arp_validate == NULL ? "NULL" : arp_validate);
4758 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4759 pr_warning("Warning: fail_over_mac only affects active-backup mode.\n");
4761 fail_over_mac_value = BOND_FOM_NONE;
4764 /* fill params struct with the proper values */
4765 params->mode = bond_mode;
4766 params->xmit_policy = xmit_hashtype;
4767 params->miimon = miimon;
4768 params->num_peer_notif = num_peer_notif;
4769 params->arp_interval = arp_interval;
4770 params->arp_validate = arp_validate_value;
4771 params->updelay = updelay;
4772 params->downdelay = downdelay;
4773 params->use_carrier = use_carrier;
4774 params->lacp_fast = lacp_fast;
4775 params->primary[0] = 0;
4776 params->primary_reselect = primary_reselect_value;
4777 params->fail_over_mac = fail_over_mac_value;
4778 params->tx_queues = tx_queues;
4779 params->all_slaves_active = all_slaves_active;
4780 params->resend_igmp = resend_igmp;
4781 params->min_links = min_links;
4784 strncpy(params->primary, primary, IFNAMSIZ);
4785 params->primary[IFNAMSIZ - 1] = 0;
4788 memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4793 static struct lock_class_key bonding_netdev_xmit_lock_key;
4794 static struct lock_class_key bonding_netdev_addr_lock_key;
4795 static struct lock_class_key bonding_tx_busylock_key;
4797 static void bond_set_lockdep_class_one(struct net_device *dev,
4798 struct netdev_queue *txq,
4801 lockdep_set_class(&txq->_xmit_lock,
4802 &bonding_netdev_xmit_lock_key);
4805 static void bond_set_lockdep_class(struct net_device *dev)
4807 lockdep_set_class(&dev->addr_list_lock,
4808 &bonding_netdev_addr_lock_key);
4809 netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4810 dev->qdisc_tx_busylock = &bonding_tx_busylock_key;
4814 * Called from registration process
4816 static int bond_init(struct net_device *bond_dev)
4818 struct bonding *bond = netdev_priv(bond_dev);
4819 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4820 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
4822 pr_debug("Begin bond_init for %s\n", bond_dev->name);
4825 * Initialize locks that may be required during
4826 * en/deslave operations. All of the bond_open work
4827 * (of which this is part) should really be moved to
4828 * a phase prior to dev_open
4830 spin_lock_init(&(bond_info->tx_hashtbl_lock));
4831 spin_lock_init(&(bond_info->rx_hashtbl_lock));
4833 bond->wq = create_singlethread_workqueue(bond_dev->name);
4837 bond_set_lockdep_class(bond_dev);
4839 list_add_tail(&bond->bond_list, &bn->dev_list);
4841 bond_prepare_sysfs_group(bond);
4843 bond_debug_register(bond);
4845 /* Ensure valid dev_addr */
4846 if (is_zero_ether_addr(bond_dev->dev_addr) &&
4847 bond_dev->addr_assign_type == NET_ADDR_PERM) {
4848 eth_hw_addr_random(bond_dev);
4849 bond->dev_addr_from_first = true;
4852 __hw_addr_init(&bond->mc_list);
4856 static int bond_validate(struct nlattr *tb[], struct nlattr *data[])
4858 if (tb[IFLA_ADDRESS]) {
4859 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
4861 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
4862 return -EADDRNOTAVAIL;
4867 static unsigned int bond_get_num_tx_queues(void)
4872 static struct rtnl_link_ops bond_link_ops __read_mostly = {
4874 .priv_size = sizeof(struct bonding),
4875 .setup = bond_setup,
4876 .validate = bond_validate,
4877 .get_num_tx_queues = bond_get_num_tx_queues,
4878 .get_num_rx_queues = bond_get_num_tx_queues, /* Use the same number
4882 /* Create a new bond based on the specified name and bonding parameters.
4883 * If name is NULL, obtain a suitable "bond%d" name for us.
4884 * Caller must NOT hold rtnl_lock; we need to release it here before we
4885 * set up our sysfs entries.
4887 int bond_create(struct net *net, const char *name)
4889 struct net_device *bond_dev;
4894 bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4895 name ? name : "bond%d",
4896 bond_setup, tx_queues);
4898 pr_err("%s: eek! can't alloc netdev!\n", name);
4903 dev_net_set(bond_dev, net);
4904 bond_dev->rtnl_link_ops = &bond_link_ops;
4906 res = register_netdevice(bond_dev);
4908 netif_carrier_off(bond_dev);
4912 bond_destructor(bond_dev);
4916 static int __net_init bond_net_init(struct net *net)
4918 struct bond_net *bn = net_generic(net, bond_net_id);
4921 INIT_LIST_HEAD(&bn->dev_list);
4923 bond_create_proc_dir(bn);
4924 bond_create_sysfs(bn);
4929 static void __net_exit bond_net_exit(struct net *net)
4931 struct bond_net *bn = net_generic(net, bond_net_id);
4932 struct bonding *bond, *tmp_bond;
4935 bond_destroy_sysfs(bn);
4936 bond_destroy_proc_dir(bn);
4938 /* Kill off any bonds created after unregistering bond rtnl ops */
4940 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4941 unregister_netdevice_queue(bond->dev, &list);
4942 unregister_netdevice_many(&list);
4946 static struct pernet_operations bond_net_ops = {
4947 .init = bond_net_init,
4948 .exit = bond_net_exit,
4950 .size = sizeof(struct bond_net),
4953 static int __init bonding_init(void)
4958 pr_info("%s", bond_version);
4960 res = bond_check_params(&bonding_defaults);
4964 res = register_pernet_subsys(&bond_net_ops);
4968 res = rtnl_link_register(&bond_link_ops);
4972 bond_create_debugfs();
4974 for (i = 0; i < max_bonds; i++) {
4975 res = bond_create(&init_net, NULL);
4980 register_netdevice_notifier(&bond_netdev_notifier);
4984 rtnl_link_unregister(&bond_link_ops);
4986 unregister_pernet_subsys(&bond_net_ops);
4991 static void __exit bonding_exit(void)
4993 unregister_netdevice_notifier(&bond_netdev_notifier);
4995 bond_destroy_debugfs();
4997 rtnl_link_unregister(&bond_link_ops);
4998 unregister_pernet_subsys(&bond_net_ops);
5000 #ifdef CONFIG_NET_POLL_CONTROLLER
5002 * Make sure we don't have an imbalance on our netpoll blocking
5004 WARN_ON(atomic_read(&netpoll_block_tx));
5008 module_init(bonding_init);
5009 module_exit(bonding_exit);
5010 MODULE_LICENSE("GPL");
5011 MODULE_VERSION(DRV_VERSION);
5012 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
5013 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
5014 MODULE_ALIAS_RTNL_LINK("bond");