2 * Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved.
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the
6 * Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
11 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, see <http://www.gnu.org/licenses/>.
17 * The full GNU General Public License is included in this distribution in the
18 * file called LICENSE.
22 #include <linux/skbuff.h>
23 #include <linux/netdevice.h>
24 #include <linux/etherdevice.h>
25 #include <linux/pkt_sched.h>
26 #include <linux/spinlock.h>
27 #include <linux/slab.h>
28 #include <linux/timer.h>
30 #include <linux/ipv6.h>
31 #include <linux/if_arp.h>
32 #include <linux/if_ether.h>
33 #include <linux/if_bonding.h>
34 #include <linux/if_vlan.h>
39 #include <asm/byteorder.h>
40 #include <net/bonding.h>
41 #include <net/bond_alb.h>
45 static const u8 mac_bcast[ETH_ALEN + 2] __long_aligned = {
46 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
48 static const u8 mac_v6_allmcast[ETH_ALEN + 2] __long_aligned = {
49 0x33, 0x33, 0x00, 0x00, 0x00, 0x01
51 static const int alb_delta_in_ticks = HZ / ALB_TIMER_TICKS_PER_SEC;
58 u8 padding[ETH_ZLEN - ETH_HLEN];
63 __be16 prot_addr_space;
67 u8 mac_src[ETH_ALEN]; /* sender hardware address */
68 __be32 ip_src; /* sender IP address */
69 u8 mac_dst[ETH_ALEN]; /* target hardware address */
70 __be32 ip_dst; /* target IP address */
74 /* Forward declaration */
75 static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[],
77 static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp);
78 static void rlb_src_unlink(struct bonding *bond, u32 index);
79 static void rlb_src_link(struct bonding *bond, u32 ip_src_hash,
82 static inline u8 _simple_hash(const u8 *hash_start, int hash_size)
87 for (i = 0; i < hash_size; i++)
88 hash ^= hash_start[i];
93 /*********************** tlb specific functions ***************************/
95 static inline void tlb_init_table_entry(struct tlb_client_info *entry, int save_load)
98 entry->load_history = 1 + entry->tx_bytes /
99 BOND_TLB_REBALANCE_INTERVAL;
103 entry->tx_slave = NULL;
104 entry->next = TLB_NULL_INDEX;
105 entry->prev = TLB_NULL_INDEX;
108 static inline void tlb_init_slave(struct slave *slave)
110 SLAVE_TLB_INFO(slave).load = 0;
111 SLAVE_TLB_INFO(slave).head = TLB_NULL_INDEX;
114 static void __tlb_clear_slave(struct bonding *bond, struct slave *slave,
117 struct tlb_client_info *tx_hash_table;
120 /* clear slave from tx_hashtbl */
121 tx_hash_table = BOND_ALB_INFO(bond).tx_hashtbl;
123 /* skip this if we've already freed the tx hash table */
125 index = SLAVE_TLB_INFO(slave).head;
126 while (index != TLB_NULL_INDEX) {
127 u32 next_index = tx_hash_table[index].next;
128 tlb_init_table_entry(&tx_hash_table[index], save_load);
133 tlb_init_slave(slave);
136 static void tlb_clear_slave(struct bonding *bond, struct slave *slave,
139 spin_lock_bh(&bond->mode_lock);
140 __tlb_clear_slave(bond, slave, save_load);
141 spin_unlock_bh(&bond->mode_lock);
144 /* Must be called before starting the monitor timer */
145 static int tlb_initialize(struct bonding *bond)
147 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
148 int size = TLB_HASH_TABLE_SIZE * sizeof(struct tlb_client_info);
149 struct tlb_client_info *new_hashtbl;
152 new_hashtbl = kzalloc(size, GFP_KERNEL);
156 spin_lock_bh(&bond->mode_lock);
158 bond_info->tx_hashtbl = new_hashtbl;
160 for (i = 0; i < TLB_HASH_TABLE_SIZE; i++)
161 tlb_init_table_entry(&bond_info->tx_hashtbl[i], 0);
163 spin_unlock_bh(&bond->mode_lock);
168 /* Must be called only after all slaves have been released */
169 static void tlb_deinitialize(struct bonding *bond)
171 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
173 spin_lock_bh(&bond->mode_lock);
175 kfree(bond_info->tx_hashtbl);
176 bond_info->tx_hashtbl = NULL;
178 spin_unlock_bh(&bond->mode_lock);
181 static long long compute_gap(struct slave *slave)
183 return (s64) (slave->speed << 20) - /* Convert to Megabit per sec */
184 (s64) (SLAVE_TLB_INFO(slave).load << 3); /* Bytes to bits */
187 static struct slave *tlb_get_least_loaded_slave(struct bonding *bond)
189 struct slave *slave, *least_loaded;
190 struct list_head *iter;
196 /* Find the slave with the largest gap */
197 bond_for_each_slave_rcu(bond, slave, iter) {
198 if (bond_slave_can_tx(slave)) {
199 long long gap = compute_gap(slave);
202 least_loaded = slave;
211 static struct slave *__tlb_choose_channel(struct bonding *bond, u32 hash_index,
214 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
215 struct tlb_client_info *hash_table;
216 struct slave *assigned_slave;
218 hash_table = bond_info->tx_hashtbl;
219 assigned_slave = hash_table[hash_index].tx_slave;
220 if (!assigned_slave) {
221 assigned_slave = tlb_get_least_loaded_slave(bond);
223 if (assigned_slave) {
224 struct tlb_slave_info *slave_info =
225 &(SLAVE_TLB_INFO(assigned_slave));
226 u32 next_index = slave_info->head;
228 hash_table[hash_index].tx_slave = assigned_slave;
229 hash_table[hash_index].next = next_index;
230 hash_table[hash_index].prev = TLB_NULL_INDEX;
232 if (next_index != TLB_NULL_INDEX)
233 hash_table[next_index].prev = hash_index;
235 slave_info->head = hash_index;
237 hash_table[hash_index].load_history;
242 hash_table[hash_index].tx_bytes += skb_len;
244 return assigned_slave;
247 static struct slave *tlb_choose_channel(struct bonding *bond, u32 hash_index,
250 struct slave *tx_slave;
252 /* We don't need to disable softirq here, becase
253 * tlb_choose_channel() is only called by bond_alb_xmit()
254 * which already has softirq disabled.
256 spin_lock(&bond->mode_lock);
257 tx_slave = __tlb_choose_channel(bond, hash_index, skb_len);
258 spin_unlock(&bond->mode_lock);
263 /*********************** rlb specific functions ***************************/
265 /* when an ARP REPLY is received from a client update its info
268 static void rlb_update_entry_from_arp(struct bonding *bond, struct arp_pkt *arp)
270 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
271 struct rlb_client_info *client_info;
274 spin_lock_bh(&bond->mode_lock);
276 hash_index = _simple_hash((u8 *)&(arp->ip_src), sizeof(arp->ip_src));
277 client_info = &(bond_info->rx_hashtbl[hash_index]);
279 if ((client_info->assigned) &&
280 (client_info->ip_src == arp->ip_dst) &&
281 (client_info->ip_dst == arp->ip_src) &&
282 (!ether_addr_equal_64bits(client_info->mac_dst, arp->mac_src))) {
283 /* update the clients MAC address */
284 ether_addr_copy(client_info->mac_dst, arp->mac_src);
285 client_info->ntt = 1;
286 bond_info->rx_ntt = 1;
289 spin_unlock_bh(&bond->mode_lock);
292 static int rlb_arp_recv(const struct sk_buff *skb, struct bonding *bond,
295 struct arp_pkt *arp, _arp;
297 if (skb->protocol != cpu_to_be16(ETH_P_ARP))
300 arp = skb_header_pointer(skb, 0, sizeof(_arp), &_arp);
304 /* We received an ARP from arp->ip_src.
305 * We might have used this IP address previously (on the bonding host
306 * itself or on a system that is bridged together with the bond).
307 * However, if arp->mac_src is different than what is stored in
308 * rx_hashtbl, some other host is now using the IP and we must prevent
309 * sending out client updates with this IP address and the old MAC
311 * Clean up all hash table entries that have this address as ip_src but
312 * have a different mac_src.
314 rlb_purge_src_ip(bond, arp);
316 if (arp->op_code == htons(ARPOP_REPLY)) {
317 /* update rx hash table for this ARP */
318 rlb_update_entry_from_arp(bond, arp);
319 netdev_dbg(bond->dev, "Server received an ARP Reply from client\n");
322 return RX_HANDLER_ANOTHER;
325 /* Caller must hold rcu_read_lock() */
326 static struct slave *__rlb_next_rx_slave(struct bonding *bond)
328 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
329 struct slave *before = NULL, *rx_slave = NULL, *slave;
330 struct list_head *iter;
333 bond_for_each_slave_rcu(bond, slave, iter) {
334 if (!bond_slave_can_tx(slave))
337 if (!before || before->speed < slave->speed)
340 if (!rx_slave || rx_slave->speed < slave->speed)
343 if (slave == bond_info->rx_slave)
346 /* we didn't find anything after the current or we have something
347 * better before and up to the current slave
349 if (!rx_slave || (before && rx_slave->speed < before->speed))
353 bond_info->rx_slave = rx_slave;
358 /* Caller must hold RTNL, rcu_read_lock is obtained only to silence checkers */
359 static struct slave *rlb_next_rx_slave(struct bonding *bond)
361 struct slave *rx_slave;
366 rx_slave = __rlb_next_rx_slave(bond);
372 /* teach the switch the mac of a disabled slave
373 * on the primary for fault tolerance
375 * Caller must hold RTNL
377 static void rlb_teach_disabled_mac_on_primary(struct bonding *bond, u8 addr[])
379 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
384 if (!bond->alb_info.primary_is_promisc) {
385 if (!dev_set_promiscuity(curr_active->dev, 1))
386 bond->alb_info.primary_is_promisc = 1;
388 bond->alb_info.primary_is_promisc = 0;
391 bond->alb_info.rlb_promisc_timeout_counter = 0;
393 alb_send_learning_packets(curr_active, addr, true);
396 /* slave being removed should not be active at this point
398 * Caller must hold rtnl.
400 static void rlb_clear_slave(struct bonding *bond, struct slave *slave)
402 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
403 struct rlb_client_info *rx_hash_table;
404 u32 index, next_index;
406 /* clear slave from rx_hashtbl */
407 spin_lock_bh(&bond->mode_lock);
409 rx_hash_table = bond_info->rx_hashtbl;
410 index = bond_info->rx_hashtbl_used_head;
411 for (; index != RLB_NULL_INDEX; index = next_index) {
412 next_index = rx_hash_table[index].used_next;
413 if (rx_hash_table[index].slave == slave) {
414 struct slave *assigned_slave = rlb_next_rx_slave(bond);
416 if (assigned_slave) {
417 rx_hash_table[index].slave = assigned_slave;
418 if (!ether_addr_equal_64bits(rx_hash_table[index].mac_dst,
420 bond_info->rx_hashtbl[index].ntt = 1;
421 bond_info->rx_ntt = 1;
422 /* A slave has been removed from the
423 * table because it is either disabled
424 * or being released. We must retry the
425 * update to avoid clients from not
426 * being updated & disconnecting when
429 bond_info->rlb_update_retry_counter =
432 } else { /* there is no active slave */
433 rx_hash_table[index].slave = NULL;
438 spin_unlock_bh(&bond->mode_lock);
440 if (slave != rtnl_dereference(bond->curr_active_slave))
441 rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr);
444 static void rlb_update_client(struct rlb_client_info *client_info)
448 if (!client_info->slave || !is_valid_ether_addr(client_info->mac_dst))
451 for (i = 0; i < RLB_ARP_BURST_SIZE; i++) {
454 skb = arp_create(ARPOP_REPLY, ETH_P_ARP,
456 client_info->slave->dev,
458 client_info->mac_dst,
459 client_info->slave->dev->dev_addr,
460 client_info->mac_dst);
462 netdev_err(client_info->slave->bond->dev,
463 "failed to create an ARP packet\n");
467 skb->dev = client_info->slave->dev;
469 if (client_info->vlan_id) {
470 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
471 client_info->vlan_id);
478 /* sends ARP REPLIES that update the clients that need updating */
479 static void rlb_update_rx_clients(struct bonding *bond)
481 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
482 struct rlb_client_info *client_info;
485 spin_lock_bh(&bond->mode_lock);
487 hash_index = bond_info->rx_hashtbl_used_head;
488 for (; hash_index != RLB_NULL_INDEX;
489 hash_index = client_info->used_next) {
490 client_info = &(bond_info->rx_hashtbl[hash_index]);
491 if (client_info->ntt) {
492 rlb_update_client(client_info);
493 if (bond_info->rlb_update_retry_counter == 0)
494 client_info->ntt = 0;
498 /* do not update the entries again until this counter is zero so that
499 * not to confuse the clients.
501 bond_info->rlb_update_delay_counter = RLB_UPDATE_DELAY;
503 spin_unlock_bh(&bond->mode_lock);
506 /* The slave was assigned a new mac address - update the clients */
507 static void rlb_req_update_slave_clients(struct bonding *bond, struct slave *slave)
509 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
510 struct rlb_client_info *client_info;
514 spin_lock_bh(&bond->mode_lock);
516 hash_index = bond_info->rx_hashtbl_used_head;
517 for (; hash_index != RLB_NULL_INDEX;
518 hash_index = client_info->used_next) {
519 client_info = &(bond_info->rx_hashtbl[hash_index]);
521 if ((client_info->slave == slave) &&
522 !ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) {
523 client_info->ntt = 1;
528 /* update the team's flag only after the whole iteration */
530 bond_info->rx_ntt = 1;
531 /* fasten the change */
532 bond_info->rlb_update_retry_counter = RLB_UPDATE_RETRY;
535 spin_unlock_bh(&bond->mode_lock);
538 /* mark all clients using src_ip to be updated */
539 static void rlb_req_update_subnet_clients(struct bonding *bond, __be32 src_ip)
541 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
542 struct rlb_client_info *client_info;
545 spin_lock(&bond->mode_lock);
547 hash_index = bond_info->rx_hashtbl_used_head;
548 for (; hash_index != RLB_NULL_INDEX;
549 hash_index = client_info->used_next) {
550 client_info = &(bond_info->rx_hashtbl[hash_index]);
552 if (!client_info->slave) {
553 netdev_err(bond->dev, "found a client with no channel in the client's hash table\n");
556 /* update all clients using this src_ip, that are not assigned
557 * to the team's address (curr_active_slave) and have a known
558 * unicast mac address.
560 if ((client_info->ip_src == src_ip) &&
561 !ether_addr_equal_64bits(client_info->slave->dev->dev_addr,
562 bond->dev->dev_addr) &&
563 !ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) {
564 client_info->ntt = 1;
565 bond_info->rx_ntt = 1;
569 spin_unlock(&bond->mode_lock);
572 static struct slave *rlb_choose_channel(struct sk_buff *skb,
573 struct bonding *bond,
574 const struct arp_pkt *arp)
576 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
577 struct slave *assigned_slave, *curr_active_slave;
578 struct rlb_client_info *client_info;
581 spin_lock(&bond->mode_lock);
583 curr_active_slave = rcu_dereference(bond->curr_active_slave);
585 hash_index = _simple_hash((u8 *)&arp->ip_dst, sizeof(arp->ip_dst));
586 client_info = &(bond_info->rx_hashtbl[hash_index]);
588 if (client_info->assigned) {
589 if ((client_info->ip_src == arp->ip_src) &&
590 (client_info->ip_dst == arp->ip_dst)) {
591 /* the entry is already assigned to this client */
592 if (!ether_addr_equal_64bits(arp->mac_dst, mac_bcast)) {
593 /* update mac address from arp */
594 ether_addr_copy(client_info->mac_dst, arp->mac_dst);
596 ether_addr_copy(client_info->mac_src, arp->mac_src);
598 assigned_slave = client_info->slave;
599 if (assigned_slave) {
600 spin_unlock(&bond->mode_lock);
601 return assigned_slave;
604 /* the entry is already assigned to some other client,
605 * move the old client to primary (curr_active_slave) so
606 * that the new client can be assigned to this entry.
608 if (curr_active_slave &&
609 client_info->slave != curr_active_slave) {
610 client_info->slave = curr_active_slave;
611 rlb_update_client(client_info);
615 /* assign a new slave */
616 assigned_slave = __rlb_next_rx_slave(bond);
618 if (assigned_slave) {
619 if (!(client_info->assigned &&
620 client_info->ip_src == arp->ip_src)) {
621 /* ip_src is going to be updated,
622 * fix the src hash list
624 u32 hash_src = _simple_hash((u8 *)&arp->ip_src,
625 sizeof(arp->ip_src));
626 rlb_src_unlink(bond, hash_index);
627 rlb_src_link(bond, hash_src, hash_index);
630 client_info->ip_src = arp->ip_src;
631 client_info->ip_dst = arp->ip_dst;
632 /* arp->mac_dst is broadcast for arp reqeusts.
633 * will be updated with clients actual unicast mac address
634 * upon receiving an arp reply.
636 ether_addr_copy(client_info->mac_dst, arp->mac_dst);
637 ether_addr_copy(client_info->mac_src, arp->mac_src);
638 client_info->slave = assigned_slave;
640 if (!ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) {
641 client_info->ntt = 1;
642 bond->alb_info.rx_ntt = 1;
644 client_info->ntt = 0;
647 if (vlan_get_tag(skb, &client_info->vlan_id))
648 client_info->vlan_id = 0;
650 if (!client_info->assigned) {
651 u32 prev_tbl_head = bond_info->rx_hashtbl_used_head;
652 bond_info->rx_hashtbl_used_head = hash_index;
653 client_info->used_next = prev_tbl_head;
654 if (prev_tbl_head != RLB_NULL_INDEX) {
655 bond_info->rx_hashtbl[prev_tbl_head].used_prev =
658 client_info->assigned = 1;
662 spin_unlock(&bond->mode_lock);
664 return assigned_slave;
667 /* chooses (and returns) transmit channel for arp reply
668 * does not choose channel for other arp types since they are
669 * sent on the curr_active_slave
671 static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond)
673 struct slave *tx_slave = NULL;
676 if (!pskb_network_may_pull(skb, sizeof(*arp)))
678 arp = (struct arp_pkt *)skb_network_header(skb);
680 /* Don't modify or load balance ARPs that do not originate locally
681 * (e.g.,arrive via a bridge).
683 if (!bond_slave_has_mac_rx(bond, arp->mac_src))
686 if (arp->op_code == htons(ARPOP_REPLY)) {
687 /* the arp must be sent on the selected rx channel */
688 tx_slave = rlb_choose_channel(skb, bond, arp);
690 ether_addr_copy(arp->mac_src, tx_slave->dev->dev_addr);
691 netdev_dbg(bond->dev, "Server sent ARP Reply packet\n");
692 } else if (arp->op_code == htons(ARPOP_REQUEST)) {
693 /* Create an entry in the rx_hashtbl for this client as a
695 * When the arp reply is received the entry will be updated
696 * with the correct unicast address of the client.
698 rlb_choose_channel(skb, bond, arp);
700 /* The ARP reply packets must be delayed so that
701 * they can cancel out the influence of the ARP request.
703 bond->alb_info.rlb_update_delay_counter = RLB_UPDATE_DELAY;
705 /* arp requests are broadcast and are sent on the primary
706 * the arp request will collapse all clients on the subnet to
707 * the primary slave. We must register these clients to be
708 * updated with their assigned mac.
710 rlb_req_update_subnet_clients(bond, arp->ip_src);
711 netdev_dbg(bond->dev, "Server sent ARP Request packet\n");
717 static void rlb_rebalance(struct bonding *bond)
719 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
720 struct slave *assigned_slave;
721 struct rlb_client_info *client_info;
725 spin_lock_bh(&bond->mode_lock);
728 hash_index = bond_info->rx_hashtbl_used_head;
729 for (; hash_index != RLB_NULL_INDEX;
730 hash_index = client_info->used_next) {
731 client_info = &(bond_info->rx_hashtbl[hash_index]);
732 assigned_slave = __rlb_next_rx_slave(bond);
733 if (assigned_slave && (client_info->slave != assigned_slave)) {
734 client_info->slave = assigned_slave;
735 client_info->ntt = 1;
740 /* update the team's flag only after the whole iteration */
742 bond_info->rx_ntt = 1;
743 spin_unlock_bh(&bond->mode_lock);
746 /* Caller must hold mode_lock */
747 static void rlb_init_table_entry_dst(struct rlb_client_info *entry)
749 entry->used_next = RLB_NULL_INDEX;
750 entry->used_prev = RLB_NULL_INDEX;
755 static void rlb_init_table_entry_src(struct rlb_client_info *entry)
757 entry->src_first = RLB_NULL_INDEX;
758 entry->src_prev = RLB_NULL_INDEX;
759 entry->src_next = RLB_NULL_INDEX;
762 static void rlb_init_table_entry(struct rlb_client_info *entry)
764 memset(entry, 0, sizeof(struct rlb_client_info));
765 rlb_init_table_entry_dst(entry);
766 rlb_init_table_entry_src(entry);
769 static void rlb_delete_table_entry_dst(struct bonding *bond, u32 index)
771 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
772 u32 next_index = bond_info->rx_hashtbl[index].used_next;
773 u32 prev_index = bond_info->rx_hashtbl[index].used_prev;
775 if (index == bond_info->rx_hashtbl_used_head)
776 bond_info->rx_hashtbl_used_head = next_index;
777 if (prev_index != RLB_NULL_INDEX)
778 bond_info->rx_hashtbl[prev_index].used_next = next_index;
779 if (next_index != RLB_NULL_INDEX)
780 bond_info->rx_hashtbl[next_index].used_prev = prev_index;
783 /* unlink a rlb hash table entry from the src list */
784 static void rlb_src_unlink(struct bonding *bond, u32 index)
786 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
787 u32 next_index = bond_info->rx_hashtbl[index].src_next;
788 u32 prev_index = bond_info->rx_hashtbl[index].src_prev;
790 bond_info->rx_hashtbl[index].src_next = RLB_NULL_INDEX;
791 bond_info->rx_hashtbl[index].src_prev = RLB_NULL_INDEX;
793 if (next_index != RLB_NULL_INDEX)
794 bond_info->rx_hashtbl[next_index].src_prev = prev_index;
796 if (prev_index == RLB_NULL_INDEX)
799 /* is prev_index pointing to the head of this list? */
800 if (bond_info->rx_hashtbl[prev_index].src_first == index)
801 bond_info->rx_hashtbl[prev_index].src_first = next_index;
803 bond_info->rx_hashtbl[prev_index].src_next = next_index;
807 static void rlb_delete_table_entry(struct bonding *bond, u32 index)
809 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
810 struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]);
812 rlb_delete_table_entry_dst(bond, index);
813 rlb_init_table_entry_dst(entry);
815 rlb_src_unlink(bond, index);
818 /* add the rx_hashtbl[ip_dst_hash] entry to the list
819 * of entries with identical ip_src_hash
821 static void rlb_src_link(struct bonding *bond, u32 ip_src_hash, u32 ip_dst_hash)
823 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
826 bond_info->rx_hashtbl[ip_dst_hash].src_prev = ip_src_hash;
827 next = bond_info->rx_hashtbl[ip_src_hash].src_first;
828 bond_info->rx_hashtbl[ip_dst_hash].src_next = next;
829 if (next != RLB_NULL_INDEX)
830 bond_info->rx_hashtbl[next].src_prev = ip_dst_hash;
831 bond_info->rx_hashtbl[ip_src_hash].src_first = ip_dst_hash;
834 /* deletes all rx_hashtbl entries with arp->ip_src if their mac_src does
835 * not match arp->mac_src
837 static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp)
839 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
840 u32 ip_src_hash = _simple_hash((u8 *)&(arp->ip_src), sizeof(arp->ip_src));
843 spin_lock_bh(&bond->mode_lock);
845 index = bond_info->rx_hashtbl[ip_src_hash].src_first;
846 while (index != RLB_NULL_INDEX) {
847 struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]);
848 u32 next_index = entry->src_next;
849 if (entry->ip_src == arp->ip_src &&
850 !ether_addr_equal_64bits(arp->mac_src, entry->mac_src))
851 rlb_delete_table_entry(bond, index);
854 spin_unlock_bh(&bond->mode_lock);
857 static int rlb_initialize(struct bonding *bond)
859 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
860 struct rlb_client_info *new_hashtbl;
861 int size = RLB_HASH_TABLE_SIZE * sizeof(struct rlb_client_info);
864 new_hashtbl = kmalloc(size, GFP_KERNEL);
868 spin_lock_bh(&bond->mode_lock);
870 bond_info->rx_hashtbl = new_hashtbl;
872 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
874 for (i = 0; i < RLB_HASH_TABLE_SIZE; i++)
875 rlb_init_table_entry(bond_info->rx_hashtbl + i);
877 spin_unlock_bh(&bond->mode_lock);
879 /* register to receive ARPs */
880 bond->recv_probe = rlb_arp_recv;
885 static void rlb_deinitialize(struct bonding *bond)
887 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
889 spin_lock_bh(&bond->mode_lock);
891 kfree(bond_info->rx_hashtbl);
892 bond_info->rx_hashtbl = NULL;
893 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
895 spin_unlock_bh(&bond->mode_lock);
898 static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
900 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
903 spin_lock_bh(&bond->mode_lock);
905 curr_index = bond_info->rx_hashtbl_used_head;
906 while (curr_index != RLB_NULL_INDEX) {
907 struct rlb_client_info *curr = &(bond_info->rx_hashtbl[curr_index]);
908 u32 next_index = bond_info->rx_hashtbl[curr_index].used_next;
910 if (curr->vlan_id == vlan_id)
911 rlb_delete_table_entry(bond, curr_index);
913 curr_index = next_index;
916 spin_unlock_bh(&bond->mode_lock);
919 /*********************** tlb/rlb shared functions *********************/
921 static void alb_send_lp_vid(struct slave *slave, u8 mac_addr[],
922 __be16 vlan_proto, u16 vid)
924 struct learning_pkt pkt;
926 int size = sizeof(struct learning_pkt);
929 memset(&pkt, 0, size);
930 ether_addr_copy(pkt.mac_dst, mac_addr);
931 ether_addr_copy(pkt.mac_src, mac_addr);
932 pkt.type = cpu_to_be16(ETH_P_LOOPBACK);
934 skb = dev_alloc_skb(size);
938 data = skb_put(skb, size);
939 memcpy(data, &pkt, size);
941 skb_reset_mac_header(skb);
942 skb->network_header = skb->mac_header + ETH_HLEN;
943 skb->protocol = pkt.type;
944 skb->priority = TC_PRIO_CONTROL;
945 skb->dev = slave->dev;
948 __vlan_hwaccel_put_tag(skb, vlan_proto, vid);
953 static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[],
956 struct bonding *bond = bond_get_bond_by_slave(slave);
957 struct net_device *upper;
958 struct list_head *iter;
959 struct bond_vlan_tag *tags;
962 alb_send_lp_vid(slave, mac_addr, 0, 0);
964 /* loop through all devices and see if we need to send a packet
968 netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) {
969 if (is_vlan_dev(upper) && vlan_get_encap_level(upper) == 0) {
971 ether_addr_equal_64bits(mac_addr,
973 alb_send_lp_vid(slave, mac_addr,
974 vlan_dev_vlan_proto(upper),
975 vlan_dev_vlan_id(upper));
976 } else if (!strict_match) {
977 alb_send_lp_vid(slave, upper->dev_addr,
978 vlan_dev_vlan_proto(upper),
979 vlan_dev_vlan_id(upper));
983 /* If this is a macvlan device, then only send updates
984 * when strict_match is turned off.
986 if (netif_is_macvlan(upper) && !strict_match) {
987 tags = bond_verify_device_path(bond->dev, upper, 0);
988 if (IS_ERR_OR_NULL(tags))
990 alb_send_lp_vid(slave, upper->dev_addr,
991 tags[0].vlan_proto, tags[0].vlan_id);
998 static int alb_set_slave_mac_addr(struct slave *slave, u8 addr[])
1000 struct net_device *dev = slave->dev;
1001 struct sockaddr s_addr;
1003 if (BOND_MODE(slave->bond) == BOND_MODE_TLB) {
1004 memcpy(dev->dev_addr, addr, dev->addr_len);
1008 /* for rlb each slave must have a unique hw mac addresses so that
1009 * each slave will receive packets destined to a different mac
1011 memcpy(s_addr.sa_data, addr, dev->addr_len);
1012 s_addr.sa_family = dev->type;
1013 if (dev_set_mac_address(dev, &s_addr)) {
1014 netdev_err(slave->bond->dev, "dev_set_mac_address of dev %s failed! ALB mode requires that the base driver support setting the hw address also when the network device's interface is open\n",
1021 /* Swap MAC addresses between two slaves.
1023 * Called with RTNL held, and no other locks.
1025 static void alb_swap_mac_addr(struct slave *slave1, struct slave *slave2)
1027 u8 tmp_mac_addr[ETH_ALEN];
1029 ether_addr_copy(tmp_mac_addr, slave1->dev->dev_addr);
1030 alb_set_slave_mac_addr(slave1, slave2->dev->dev_addr);
1031 alb_set_slave_mac_addr(slave2, tmp_mac_addr);
1035 /* Send learning packets after MAC address swap.
1037 * Called with RTNL and no other locks
1039 static void alb_fasten_mac_swap(struct bonding *bond, struct slave *slave1,
1040 struct slave *slave2)
1042 int slaves_state_differ = (bond_slave_can_tx(slave1) != bond_slave_can_tx(slave2));
1043 struct slave *disabled_slave = NULL;
1047 /* fasten the change in the switch */
1048 if (bond_slave_can_tx(slave1)) {
1049 alb_send_learning_packets(slave1, slave1->dev->dev_addr, false);
1050 if (bond->alb_info.rlb_enabled) {
1051 /* inform the clients that the mac address
1054 rlb_req_update_slave_clients(bond, slave1);
1057 disabled_slave = slave1;
1060 if (bond_slave_can_tx(slave2)) {
1061 alb_send_learning_packets(slave2, slave2->dev->dev_addr, false);
1062 if (bond->alb_info.rlb_enabled) {
1063 /* inform the clients that the mac address
1066 rlb_req_update_slave_clients(bond, slave2);
1069 disabled_slave = slave2;
1072 if (bond->alb_info.rlb_enabled && slaves_state_differ) {
1073 /* A disabled slave was assigned an active mac addr */
1074 rlb_teach_disabled_mac_on_primary(bond,
1075 disabled_slave->dev->dev_addr);
1080 * alb_change_hw_addr_on_detach
1081 * @bond: bonding we're working on
1082 * @slave: the slave that was just detached
1084 * We assume that @slave was already detached from the slave list.
1086 * If @slave's permanent hw address is different both from its current
1087 * address and from @bond's address, then somewhere in the bond there's
1088 * a slave that has @slave's permanet address as its current address.
1089 * We'll make sure that that slave no longer uses @slave's permanent address.
1091 * Caller must hold RTNL and no other locks
1093 static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *slave)
1097 struct slave *found_slave;
1099 perm_curr_diff = !ether_addr_equal_64bits(slave->perm_hwaddr,
1100 slave->dev->dev_addr);
1101 perm_bond_diff = !ether_addr_equal_64bits(slave->perm_hwaddr,
1102 bond->dev->dev_addr);
1104 if (perm_curr_diff && perm_bond_diff) {
1105 found_slave = bond_slave_has_mac(bond, slave->perm_hwaddr);
1108 alb_swap_mac_addr(slave, found_slave);
1109 alb_fasten_mac_swap(bond, slave, found_slave);
1115 * alb_handle_addr_collision_on_attach
1116 * @bond: bonding we're working on
1117 * @slave: the slave that was just attached
1119 * checks uniqueness of slave's mac address and handles the case the
1120 * new slave uses the bonds mac address.
1122 * If the permanent hw address of @slave is @bond's hw address, we need to
1123 * find a different hw address to give @slave, that isn't in use by any other
1124 * slave in the bond. This address must be, of course, one of the permanent
1125 * addresses of the other slaves.
1127 * We go over the slave list, and for each slave there we compare its
1128 * permanent hw address with the current address of all the other slaves.
1129 * If no match was found, then we've found a slave with a permanent address
1130 * that isn't used by any other slave in the bond, so we can assign it to
1133 * assumption: this function is called before @slave is attached to the
1136 static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slave *slave)
1138 struct slave *has_bond_addr = rcu_access_pointer(bond->curr_active_slave);
1139 struct slave *tmp_slave1, *free_mac_slave = NULL;
1140 struct list_head *iter;
1142 if (!bond_has_slaves(bond)) {
1143 /* this is the first slave */
1147 /* if slave's mac address differs from bond's mac address
1148 * check uniqueness of slave's mac address against the other
1149 * slaves in the bond.
1151 if (!ether_addr_equal_64bits(slave->perm_hwaddr, bond->dev->dev_addr)) {
1152 if (!bond_slave_has_mac(bond, slave->dev->dev_addr))
1155 /* Try setting slave mac to bond address and fall-through
1156 * to code handling that situation below...
1158 alb_set_slave_mac_addr(slave, bond->dev->dev_addr);
1161 /* The slave's address is equal to the address of the bond.
1162 * Search for a spare address in the bond for this slave.
1164 bond_for_each_slave(bond, tmp_slave1, iter) {
1165 if (!bond_slave_has_mac(bond, tmp_slave1->perm_hwaddr)) {
1166 /* no slave has tmp_slave1's perm addr
1169 free_mac_slave = tmp_slave1;
1173 if (!has_bond_addr) {
1174 if (ether_addr_equal_64bits(tmp_slave1->dev->dev_addr,
1175 bond->dev->dev_addr)) {
1177 has_bond_addr = tmp_slave1;
1182 if (free_mac_slave) {
1183 alb_set_slave_mac_addr(slave, free_mac_slave->perm_hwaddr);
1185 netdev_warn(bond->dev, "the hw address of slave %s is in use by the bond; giving it the hw address of %s\n",
1186 slave->dev->name, free_mac_slave->dev->name);
1188 } else if (has_bond_addr) {
1189 netdev_err(bond->dev, "the hw address of slave %s is in use by the bond; couldn't find a slave with a free hw address to give it (this should not have happened)\n",
1198 * alb_set_mac_address
1202 * In TLB mode all slaves are configured to the bond's hw address, but set
1203 * their dev_addr field to different addresses (based on their permanent hw
1206 * For each slave, this function sets the interface to the new address and then
1207 * changes its dev_addr field to its previous value.
1209 * Unwinding assumes bond's mac address has not yet changed.
1211 static int alb_set_mac_address(struct bonding *bond, void *addr)
1213 struct slave *slave, *rollback_slave;
1214 struct list_head *iter;
1216 char tmp_addr[ETH_ALEN];
1219 if (bond->alb_info.rlb_enabled)
1222 bond_for_each_slave(bond, slave, iter) {
1223 /* save net_device's current hw address */
1224 ether_addr_copy(tmp_addr, slave->dev->dev_addr);
1226 res = dev_set_mac_address(slave->dev, addr);
1228 /* restore net_device's hw address */
1229 ether_addr_copy(slave->dev->dev_addr, tmp_addr);
1238 memcpy(sa.sa_data, bond->dev->dev_addr, bond->dev->addr_len);
1239 sa.sa_family = bond->dev->type;
1241 /* unwind from head to the slave that failed */
1242 bond_for_each_slave(bond, rollback_slave, iter) {
1243 if (rollback_slave == slave)
1245 ether_addr_copy(tmp_addr, rollback_slave->dev->dev_addr);
1246 dev_set_mac_address(rollback_slave->dev, &sa);
1247 ether_addr_copy(rollback_slave->dev->dev_addr, tmp_addr);
1253 /************************ exported alb funcions ************************/
1255 int bond_alb_initialize(struct bonding *bond, int rlb_enabled)
1259 res = tlb_initialize(bond);
1264 bond->alb_info.rlb_enabled = 1;
1265 res = rlb_initialize(bond);
1267 tlb_deinitialize(bond);
1271 bond->alb_info.rlb_enabled = 0;
1277 void bond_alb_deinitialize(struct bonding *bond)
1279 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1281 tlb_deinitialize(bond);
1283 if (bond_info->rlb_enabled)
1284 rlb_deinitialize(bond);
1287 static int bond_do_alb_xmit(struct sk_buff *skb, struct bonding *bond,
1288 struct slave *tx_slave)
1290 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1291 struct ethhdr *eth_data = eth_hdr(skb);
1294 /* unbalanced or unassigned, send through primary */
1295 tx_slave = rcu_dereference(bond->curr_active_slave);
1296 if (bond->params.tlb_dynamic_lb)
1297 bond_info->unbalanced_load += skb->len;
1300 if (tx_slave && bond_slave_can_tx(tx_slave)) {
1301 if (tx_slave != rcu_access_pointer(bond->curr_active_slave)) {
1302 ether_addr_copy(eth_data->h_source,
1303 tx_slave->dev->dev_addr);
1306 bond_dev_queue_xmit(bond, skb, tx_slave->dev);
1310 if (tx_slave && bond->params.tlb_dynamic_lb) {
1311 spin_lock(&bond->mode_lock);
1312 __tlb_clear_slave(bond, tx_slave, 0);
1313 spin_unlock(&bond->mode_lock);
1316 /* no suitable interface, frame not sent */
1317 bond_tx_drop(bond->dev, skb);
1319 return NETDEV_TX_OK;
1322 int bond_tlb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
1324 struct bonding *bond = netdev_priv(bond_dev);
1325 struct ethhdr *eth_data;
1326 struct slave *tx_slave = NULL;
1329 skb_reset_mac_header(skb);
1330 eth_data = eth_hdr(skb);
1332 /* Do not TX balance any multicast or broadcast */
1333 if (!is_multicast_ether_addr(eth_data->h_dest)) {
1334 switch (skb->protocol) {
1335 case htons(ETH_P_IP):
1336 case htons(ETH_P_IPX):
1337 /* In case of IPX, it will falback to L2 hash */
1338 case htons(ETH_P_IPV6):
1339 hash_index = bond_xmit_hash(bond, skb);
1340 if (bond->params.tlb_dynamic_lb) {
1341 tx_slave = tlb_choose_channel(bond,
1345 struct bond_up_slave *slaves;
1348 slaves = rcu_dereference(bond->slave_arr);
1349 count = slaves ? ACCESS_ONCE(slaves->count) : 0;
1351 tx_slave = slaves->arr[hash_index %
1357 return bond_do_alb_xmit(skb, bond, tx_slave);
1360 int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
1362 struct bonding *bond = netdev_priv(bond_dev);
1363 struct ethhdr *eth_data;
1364 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1365 struct slave *tx_slave = NULL;
1366 static const __be32 ip_bcast = htonl(0xffffffff);
1368 bool do_tx_balance = true;
1370 const u8 *hash_start = NULL;
1372 skb_reset_mac_header(skb);
1373 eth_data = eth_hdr(skb);
1375 switch (ntohs(skb->protocol)) {
1377 const struct iphdr *iph;
1379 if (ether_addr_equal_64bits(eth_data->h_dest, mac_bcast) ||
1380 (!pskb_network_may_pull(skb, sizeof(*iph)))) {
1381 do_tx_balance = false;
1385 if (iph->daddr == ip_bcast || iph->protocol == IPPROTO_IGMP) {
1386 do_tx_balance = false;
1389 hash_start = (char *)&(iph->daddr);
1390 hash_size = sizeof(iph->daddr);
1394 const struct ipv6hdr *ip6hdr;
1396 /* IPv6 doesn't really use broadcast mac address, but leave
1397 * that here just in case.
1399 if (ether_addr_equal_64bits(eth_data->h_dest, mac_bcast)) {
1400 do_tx_balance = false;
1404 /* IPv6 uses all-nodes multicast as an equivalent to
1405 * broadcasts in IPv4.
1407 if (ether_addr_equal_64bits(eth_data->h_dest, mac_v6_allmcast)) {
1408 do_tx_balance = false;
1412 if (!pskb_network_may_pull(skb, sizeof(*ip6hdr))) {
1413 do_tx_balance = false;
1416 /* Additionally, DAD probes should not be tx-balanced as that
1417 * will lead to false positives for duplicate addresses and
1418 * prevent address configuration from working.
1420 ip6hdr = ipv6_hdr(skb);
1421 if (ipv6_addr_any(&ip6hdr->saddr)) {
1422 do_tx_balance = false;
1426 hash_start = (char *)&ip6hdr->daddr;
1427 hash_size = sizeof(ip6hdr->daddr);
1431 const struct ipxhdr *ipxhdr;
1433 if (pskb_network_may_pull(skb, sizeof(*ipxhdr))) {
1434 do_tx_balance = false;
1437 ipxhdr = (struct ipxhdr *)skb_network_header(skb);
1439 if (ipxhdr->ipx_checksum != IPX_NO_CHECKSUM) {
1440 /* something is wrong with this packet */
1441 do_tx_balance = false;
1445 if (ipxhdr->ipx_type != IPX_TYPE_NCP) {
1446 /* The only protocol worth balancing in
1447 * this family since it has an "ARP" like
1450 do_tx_balance = false;
1454 eth_data = eth_hdr(skb);
1455 hash_start = (char *)eth_data->h_dest;
1456 hash_size = ETH_ALEN;
1460 do_tx_balance = false;
1461 if (bond_info->rlb_enabled)
1462 tx_slave = rlb_arp_xmit(skb, bond);
1465 do_tx_balance = false;
1469 if (do_tx_balance) {
1470 hash_index = _simple_hash(hash_start, hash_size);
1471 tx_slave = tlb_choose_channel(bond, hash_index, skb->len);
1474 return bond_do_alb_xmit(skb, bond, tx_slave);
1477 void bond_alb_monitor(struct work_struct *work)
1479 struct bonding *bond = container_of(work, struct bonding,
1481 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1482 struct list_head *iter;
1483 struct slave *slave;
1485 if (!bond_has_slaves(bond)) {
1486 bond_info->tx_rebalance_counter = 0;
1487 bond_info->lp_counter = 0;
1493 bond_info->tx_rebalance_counter++;
1494 bond_info->lp_counter++;
1496 /* send learning packets */
1497 if (bond_info->lp_counter >= BOND_ALB_LP_TICKS(bond)) {
1500 bond_for_each_slave_rcu(bond, slave, iter) {
1501 /* If updating current_active, use all currently
1502 * user mac addreses (!strict_match). Otherwise, only
1503 * use mac of the slave device.
1504 * In RLB mode, we always use strict matches.
1506 strict_match = (slave != rcu_access_pointer(bond->curr_active_slave) ||
1507 bond_info->rlb_enabled);
1508 alb_send_learning_packets(slave, slave->dev->dev_addr,
1511 bond_info->lp_counter = 0;
1514 /* rebalance tx traffic */
1515 if (bond_info->tx_rebalance_counter >= BOND_TLB_REBALANCE_TICKS) {
1516 bond_for_each_slave_rcu(bond, slave, iter) {
1517 tlb_clear_slave(bond, slave, 1);
1518 if (slave == rcu_access_pointer(bond->curr_active_slave)) {
1519 SLAVE_TLB_INFO(slave).load =
1520 bond_info->unbalanced_load /
1521 BOND_TLB_REBALANCE_INTERVAL;
1522 bond_info->unbalanced_load = 0;
1525 bond_info->tx_rebalance_counter = 0;
1528 if (bond_info->rlb_enabled) {
1529 if (bond_info->primary_is_promisc &&
1530 (++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) {
1532 /* dev_set_promiscuity requires rtnl and
1533 * nothing else. Avoid race with bond_close.
1536 if (!rtnl_trylock())
1539 bond_info->rlb_promisc_timeout_counter = 0;
1541 /* If the primary was set to promiscuous mode
1542 * because a slave was disabled then
1543 * it can now leave promiscuous mode.
1545 dev_set_promiscuity(rtnl_dereference(bond->curr_active_slave)->dev,
1547 bond_info->primary_is_promisc = 0;
1553 if (bond_info->rlb_rebalance) {
1554 bond_info->rlb_rebalance = 0;
1555 rlb_rebalance(bond);
1558 /* check if clients need updating */
1559 if (bond_info->rx_ntt) {
1560 if (bond_info->rlb_update_delay_counter) {
1561 --bond_info->rlb_update_delay_counter;
1563 rlb_update_rx_clients(bond);
1564 if (bond_info->rlb_update_retry_counter)
1565 --bond_info->rlb_update_retry_counter;
1567 bond_info->rx_ntt = 0;
1573 queue_delayed_work(bond->wq, &bond->alb_work, alb_delta_in_ticks);
1576 /* assumption: called before the slave is attached to the bond
1577 * and not locked by the bond lock
1579 int bond_alb_init_slave(struct bonding *bond, struct slave *slave)
1583 res = alb_set_slave_mac_addr(slave, slave->perm_hwaddr);
1587 res = alb_handle_addr_collision_on_attach(bond, slave);
1591 tlb_init_slave(slave);
1593 /* order a rebalance ASAP */
1594 bond->alb_info.tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS;
1596 if (bond->alb_info.rlb_enabled)
1597 bond->alb_info.rlb_rebalance = 1;
1602 /* Remove slave from tlb and rlb hash tables, and fix up MAC addresses
1605 * Caller must hold RTNL and no other locks
1607 void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave)
1609 if (bond_has_slaves(bond))
1610 alb_change_hw_addr_on_detach(bond, slave);
1612 tlb_clear_slave(bond, slave, 0);
1614 if (bond->alb_info.rlb_enabled) {
1615 bond->alb_info.rx_slave = NULL;
1616 rlb_clear_slave(bond, slave);
1621 void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link)
1623 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1625 if (link == BOND_LINK_DOWN) {
1626 tlb_clear_slave(bond, slave, 0);
1627 if (bond->alb_info.rlb_enabled)
1628 rlb_clear_slave(bond, slave);
1629 } else if (link == BOND_LINK_UP) {
1630 /* order a rebalance ASAP */
1631 bond_info->tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS;
1632 if (bond->alb_info.rlb_enabled) {
1633 bond->alb_info.rlb_rebalance = 1;
1634 /* If the updelay module parameter is smaller than the
1635 * forwarding delay of the switch the rebalance will
1636 * not work because the rebalance arp replies will
1637 * not be forwarded to the clients..
1642 if (bond_is_nondyn_tlb(bond)) {
1643 if (bond_update_slave_arr(bond, NULL))
1644 pr_err("Failed to build slave-array for TLB mode.\n");
1649 * bond_alb_handle_active_change - assign new curr_active_slave
1650 * @bond: our bonding struct
1651 * @new_slave: new slave to assign
1653 * Set the bond->curr_active_slave to @new_slave and handle
1654 * mac address swapping and promiscuity changes as needed.
1656 * Caller must hold RTNL
1658 void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave)
1660 struct slave *swap_slave;
1661 struct slave *curr_active;
1663 curr_active = rtnl_dereference(bond->curr_active_slave);
1664 if (curr_active == new_slave)
1667 if (curr_active && bond->alb_info.primary_is_promisc) {
1668 dev_set_promiscuity(curr_active->dev, -1);
1669 bond->alb_info.primary_is_promisc = 0;
1670 bond->alb_info.rlb_promisc_timeout_counter = 0;
1673 swap_slave = curr_active;
1674 rcu_assign_pointer(bond->curr_active_slave, new_slave);
1676 if (!new_slave || !bond_has_slaves(bond))
1679 /* set the new curr_active_slave to the bonds mac address
1680 * i.e. swap mac addresses of old curr_active_slave and new curr_active_slave
1683 swap_slave = bond_slave_has_mac(bond, bond->dev->dev_addr);
1685 /* Arrange for swap_slave and new_slave to temporarily be
1686 * ignored so we can mess with their MAC addresses without
1687 * fear of interference from transmit activity.
1690 tlb_clear_slave(bond, swap_slave, 1);
1691 tlb_clear_slave(bond, new_slave, 1);
1693 /* in TLB mode, the slave might flip down/up with the old dev_addr,
1694 * and thus filter bond->dev_addr's packets, so force bond's mac
1696 if (BOND_MODE(bond) == BOND_MODE_TLB) {
1698 u8 tmp_addr[ETH_ALEN];
1700 ether_addr_copy(tmp_addr, new_slave->dev->dev_addr);
1702 memcpy(sa.sa_data, bond->dev->dev_addr, bond->dev->addr_len);
1703 sa.sa_family = bond->dev->type;
1704 /* we don't care if it can't change its mac, best effort */
1705 dev_set_mac_address(new_slave->dev, &sa);
1707 ether_addr_copy(new_slave->dev->dev_addr, tmp_addr);
1710 /* curr_active_slave must be set before calling alb_swap_mac_addr */
1712 /* swap mac address */
1713 alb_swap_mac_addr(swap_slave, new_slave);
1714 alb_fasten_mac_swap(bond, swap_slave, new_slave);
1716 /* set the new_slave to the bond mac address */
1717 alb_set_slave_mac_addr(new_slave, bond->dev->dev_addr);
1718 alb_send_learning_packets(new_slave, bond->dev->dev_addr,
1723 /* Called with RTNL */
1724 int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr)
1726 struct bonding *bond = netdev_priv(bond_dev);
1727 struct sockaddr *sa = addr;
1728 struct slave *curr_active;
1729 struct slave *swap_slave;
1732 if (!is_valid_ether_addr(sa->sa_data))
1733 return -EADDRNOTAVAIL;
1735 res = alb_set_mac_address(bond, addr);
1739 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
1741 /* If there is no curr_active_slave there is nothing else to do.
1742 * Otherwise we'll need to pass the new address to it and handle
1745 curr_active = rtnl_dereference(bond->curr_active_slave);
1749 swap_slave = bond_slave_has_mac(bond, bond_dev->dev_addr);
1752 alb_swap_mac_addr(swap_slave, curr_active);
1753 alb_fasten_mac_swap(bond, swap_slave, curr_active);
1755 alb_set_slave_mac_addr(curr_active, bond_dev->dev_addr);
1757 alb_send_learning_packets(curr_active,
1758 bond_dev->dev_addr, false);
1759 if (bond->alb_info.rlb_enabled) {
1760 /* inform clients mac address has changed */
1761 rlb_req_update_slave_clients(bond, curr_active);
1768 void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
1770 if (bond->alb_info.rlb_enabled)
1771 rlb_clear_vlan(bond, vlan_id);