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 bond_hw_addr_copy(arp->mac_src, tx_slave->dev->dev_addr,
691 tx_slave->dev->addr_len);
692 netdev_dbg(bond->dev, "Server sent ARP Reply packet\n");
693 } else if (arp->op_code == htons(ARPOP_REQUEST)) {
694 /* Create an entry in the rx_hashtbl for this client as a
696 * When the arp reply is received the entry will be updated
697 * with the correct unicast address of the client.
699 rlb_choose_channel(skb, bond, arp);
701 /* The ARP reply packets must be delayed so that
702 * they can cancel out the influence of the ARP request.
704 bond->alb_info.rlb_update_delay_counter = RLB_UPDATE_DELAY;
706 /* arp requests are broadcast and are sent on the primary
707 * the arp request will collapse all clients on the subnet to
708 * the primary slave. We must register these clients to be
709 * updated with their assigned mac.
711 rlb_req_update_subnet_clients(bond, arp->ip_src);
712 netdev_dbg(bond->dev, "Server sent ARP Request packet\n");
718 static void rlb_rebalance(struct bonding *bond)
720 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
721 struct slave *assigned_slave;
722 struct rlb_client_info *client_info;
726 spin_lock_bh(&bond->mode_lock);
729 hash_index = bond_info->rx_hashtbl_used_head;
730 for (; hash_index != RLB_NULL_INDEX;
731 hash_index = client_info->used_next) {
732 client_info = &(bond_info->rx_hashtbl[hash_index]);
733 assigned_slave = __rlb_next_rx_slave(bond);
734 if (assigned_slave && (client_info->slave != assigned_slave)) {
735 client_info->slave = assigned_slave;
736 client_info->ntt = 1;
741 /* update the team's flag only after the whole iteration */
743 bond_info->rx_ntt = 1;
744 spin_unlock_bh(&bond->mode_lock);
747 /* Caller must hold mode_lock */
748 static void rlb_init_table_entry_dst(struct rlb_client_info *entry)
750 entry->used_next = RLB_NULL_INDEX;
751 entry->used_prev = RLB_NULL_INDEX;
756 static void rlb_init_table_entry_src(struct rlb_client_info *entry)
758 entry->src_first = RLB_NULL_INDEX;
759 entry->src_prev = RLB_NULL_INDEX;
760 entry->src_next = RLB_NULL_INDEX;
763 static void rlb_init_table_entry(struct rlb_client_info *entry)
765 memset(entry, 0, sizeof(struct rlb_client_info));
766 rlb_init_table_entry_dst(entry);
767 rlb_init_table_entry_src(entry);
770 static void rlb_delete_table_entry_dst(struct bonding *bond, u32 index)
772 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
773 u32 next_index = bond_info->rx_hashtbl[index].used_next;
774 u32 prev_index = bond_info->rx_hashtbl[index].used_prev;
776 if (index == bond_info->rx_hashtbl_used_head)
777 bond_info->rx_hashtbl_used_head = next_index;
778 if (prev_index != RLB_NULL_INDEX)
779 bond_info->rx_hashtbl[prev_index].used_next = next_index;
780 if (next_index != RLB_NULL_INDEX)
781 bond_info->rx_hashtbl[next_index].used_prev = prev_index;
784 /* unlink a rlb hash table entry from the src list */
785 static void rlb_src_unlink(struct bonding *bond, u32 index)
787 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
788 u32 next_index = bond_info->rx_hashtbl[index].src_next;
789 u32 prev_index = bond_info->rx_hashtbl[index].src_prev;
791 bond_info->rx_hashtbl[index].src_next = RLB_NULL_INDEX;
792 bond_info->rx_hashtbl[index].src_prev = RLB_NULL_INDEX;
794 if (next_index != RLB_NULL_INDEX)
795 bond_info->rx_hashtbl[next_index].src_prev = prev_index;
797 if (prev_index == RLB_NULL_INDEX)
800 /* is prev_index pointing to the head of this list? */
801 if (bond_info->rx_hashtbl[prev_index].src_first == index)
802 bond_info->rx_hashtbl[prev_index].src_first = next_index;
804 bond_info->rx_hashtbl[prev_index].src_next = next_index;
808 static void rlb_delete_table_entry(struct bonding *bond, u32 index)
810 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
811 struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]);
813 rlb_delete_table_entry_dst(bond, index);
814 rlb_init_table_entry_dst(entry);
816 rlb_src_unlink(bond, index);
819 /* add the rx_hashtbl[ip_dst_hash] entry to the list
820 * of entries with identical ip_src_hash
822 static void rlb_src_link(struct bonding *bond, u32 ip_src_hash, u32 ip_dst_hash)
824 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
827 bond_info->rx_hashtbl[ip_dst_hash].src_prev = ip_src_hash;
828 next = bond_info->rx_hashtbl[ip_src_hash].src_first;
829 bond_info->rx_hashtbl[ip_dst_hash].src_next = next;
830 if (next != RLB_NULL_INDEX)
831 bond_info->rx_hashtbl[next].src_prev = ip_dst_hash;
832 bond_info->rx_hashtbl[ip_src_hash].src_first = ip_dst_hash;
835 /* deletes all rx_hashtbl entries with arp->ip_src if their mac_src does
836 * not match arp->mac_src
838 static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp)
840 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
841 u32 ip_src_hash = _simple_hash((u8 *)&(arp->ip_src), sizeof(arp->ip_src));
844 spin_lock_bh(&bond->mode_lock);
846 index = bond_info->rx_hashtbl[ip_src_hash].src_first;
847 while (index != RLB_NULL_INDEX) {
848 struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]);
849 u32 next_index = entry->src_next;
850 if (entry->ip_src == arp->ip_src &&
851 !ether_addr_equal_64bits(arp->mac_src, entry->mac_src))
852 rlb_delete_table_entry(bond, index);
855 spin_unlock_bh(&bond->mode_lock);
858 static int rlb_initialize(struct bonding *bond)
860 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
861 struct rlb_client_info *new_hashtbl;
862 int size = RLB_HASH_TABLE_SIZE * sizeof(struct rlb_client_info);
865 new_hashtbl = kmalloc(size, GFP_KERNEL);
869 spin_lock_bh(&bond->mode_lock);
871 bond_info->rx_hashtbl = new_hashtbl;
873 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
875 for (i = 0; i < RLB_HASH_TABLE_SIZE; i++)
876 rlb_init_table_entry(bond_info->rx_hashtbl + i);
878 spin_unlock_bh(&bond->mode_lock);
880 /* register to receive ARPs */
881 bond->recv_probe = rlb_arp_recv;
886 static void rlb_deinitialize(struct bonding *bond)
888 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
890 spin_lock_bh(&bond->mode_lock);
892 kfree(bond_info->rx_hashtbl);
893 bond_info->rx_hashtbl = NULL;
894 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
896 spin_unlock_bh(&bond->mode_lock);
899 static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
901 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
904 spin_lock_bh(&bond->mode_lock);
906 curr_index = bond_info->rx_hashtbl_used_head;
907 while (curr_index != RLB_NULL_INDEX) {
908 struct rlb_client_info *curr = &(bond_info->rx_hashtbl[curr_index]);
909 u32 next_index = bond_info->rx_hashtbl[curr_index].used_next;
911 if (curr->vlan_id == vlan_id)
912 rlb_delete_table_entry(bond, curr_index);
914 curr_index = next_index;
917 spin_unlock_bh(&bond->mode_lock);
920 /*********************** tlb/rlb shared functions *********************/
922 static void alb_send_lp_vid(struct slave *slave, u8 mac_addr[],
923 __be16 vlan_proto, u16 vid)
925 struct learning_pkt pkt;
927 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 skb_put_data(skb, &pkt, size);
940 skb_reset_mac_header(skb);
941 skb->network_header = skb->mac_header + ETH_HLEN;
942 skb->protocol = pkt.type;
943 skb->priority = TC_PRIO_CONTROL;
944 skb->dev = slave->dev;
946 netdev_dbg(slave->bond->dev,
947 "Send learning packet: dev %s mac %pM vlan %d\n",
948 slave->dev->name, mac_addr, vid);
951 __vlan_hwaccel_put_tag(skb, vlan_proto, vid);
956 struct alb_walk_data {
957 struct bonding *bond;
963 static int alb_upper_dev_walk(struct net_device *upper, void *_data)
965 struct alb_walk_data *data = _data;
966 bool strict_match = data->strict_match;
967 struct bonding *bond = data->bond;
968 struct slave *slave = data->slave;
969 u8 *mac_addr = data->mac_addr;
970 struct bond_vlan_tag *tags;
972 if (is_vlan_dev(upper) &&
973 bond->nest_level == vlan_get_encap_level(upper) - 1) {
974 if (upper->addr_assign_type == NET_ADDR_STOLEN) {
975 alb_send_lp_vid(slave, mac_addr,
976 vlan_dev_vlan_proto(upper),
977 vlan_dev_vlan_id(upper));
979 alb_send_lp_vid(slave, upper->dev_addr,
980 vlan_dev_vlan_proto(upper),
981 vlan_dev_vlan_id(upper));
985 /* If this is a macvlan device, then only send updates
986 * when strict_match is turned off.
988 if (netif_is_macvlan(upper) && !strict_match) {
989 tags = bond_verify_device_path(bond->dev, upper, 0);
990 if (IS_ERR_OR_NULL(tags))
992 alb_send_lp_vid(slave, upper->dev_addr,
993 tags[0].vlan_proto, tags[0].vlan_id);
1000 static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[],
1003 struct bonding *bond = bond_get_bond_by_slave(slave);
1004 struct alb_walk_data data = {
1005 .strict_match = strict_match,
1006 .mac_addr = mac_addr,
1012 alb_send_lp_vid(slave, mac_addr, 0, 0);
1014 /* loop through all devices and see if we need to send a packet
1018 netdev_walk_all_upper_dev_rcu(bond->dev, alb_upper_dev_walk, &data);
1022 static int alb_set_slave_mac_addr(struct slave *slave, u8 addr[],
1025 struct net_device *dev = slave->dev;
1026 struct sockaddr_storage ss;
1028 if (BOND_MODE(slave->bond) == BOND_MODE_TLB) {
1029 memcpy(dev->dev_addr, addr, len);
1033 /* for rlb each slave must have a unique hw mac addresses so that
1034 * each slave will receive packets destined to a different mac
1036 memcpy(ss.__data, addr, len);
1037 ss.ss_family = dev->type;
1038 if (dev_set_mac_address(dev, (struct sockaddr *)&ss)) {
1039 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",
1046 /* Swap MAC addresses between two slaves.
1048 * Called with RTNL held, and no other locks.
1050 static void alb_swap_mac_addr(struct slave *slave1, struct slave *slave2)
1052 u8 tmp_mac_addr[MAX_ADDR_LEN];
1054 bond_hw_addr_copy(tmp_mac_addr, slave1->dev->dev_addr,
1055 slave1->dev->addr_len);
1056 alb_set_slave_mac_addr(slave1, slave2->dev->dev_addr,
1057 slave2->dev->addr_len);
1058 alb_set_slave_mac_addr(slave2, tmp_mac_addr,
1059 slave1->dev->addr_len);
1063 /* Send learning packets after MAC address swap.
1065 * Called with RTNL and no other locks
1067 static void alb_fasten_mac_swap(struct bonding *bond, struct slave *slave1,
1068 struct slave *slave2)
1070 int slaves_state_differ = (bond_slave_can_tx(slave1) != bond_slave_can_tx(slave2));
1071 struct slave *disabled_slave = NULL;
1075 /* fasten the change in the switch */
1076 if (bond_slave_can_tx(slave1)) {
1077 alb_send_learning_packets(slave1, slave1->dev->dev_addr, false);
1078 if (bond->alb_info.rlb_enabled) {
1079 /* inform the clients that the mac address
1082 rlb_req_update_slave_clients(bond, slave1);
1085 disabled_slave = slave1;
1088 if (bond_slave_can_tx(slave2)) {
1089 alb_send_learning_packets(slave2, slave2->dev->dev_addr, false);
1090 if (bond->alb_info.rlb_enabled) {
1091 /* inform the clients that the mac address
1094 rlb_req_update_slave_clients(bond, slave2);
1097 disabled_slave = slave2;
1100 if (bond->alb_info.rlb_enabled && slaves_state_differ) {
1101 /* A disabled slave was assigned an active mac addr */
1102 rlb_teach_disabled_mac_on_primary(bond,
1103 disabled_slave->dev->dev_addr);
1108 * alb_change_hw_addr_on_detach
1109 * @bond: bonding we're working on
1110 * @slave: the slave that was just detached
1112 * We assume that @slave was already detached from the slave list.
1114 * If @slave's permanent hw address is different both from its current
1115 * address and from @bond's address, then somewhere in the bond there's
1116 * a slave that has @slave's permanet address as its current address.
1117 * We'll make sure that that slave no longer uses @slave's permanent address.
1119 * Caller must hold RTNL and no other locks
1121 static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *slave)
1125 struct slave *found_slave;
1127 perm_curr_diff = !ether_addr_equal_64bits(slave->perm_hwaddr,
1128 slave->dev->dev_addr);
1129 perm_bond_diff = !ether_addr_equal_64bits(slave->perm_hwaddr,
1130 bond->dev->dev_addr);
1132 if (perm_curr_diff && perm_bond_diff) {
1133 found_slave = bond_slave_has_mac(bond, slave->perm_hwaddr);
1136 alb_swap_mac_addr(slave, found_slave);
1137 alb_fasten_mac_swap(bond, slave, found_slave);
1143 * alb_handle_addr_collision_on_attach
1144 * @bond: bonding we're working on
1145 * @slave: the slave that was just attached
1147 * checks uniqueness of slave's mac address and handles the case the
1148 * new slave uses the bonds mac address.
1150 * If the permanent hw address of @slave is @bond's hw address, we need to
1151 * find a different hw address to give @slave, that isn't in use by any other
1152 * slave in the bond. This address must be, of course, one of the permanent
1153 * addresses of the other slaves.
1155 * We go over the slave list, and for each slave there we compare its
1156 * permanent hw address with the current address of all the other slaves.
1157 * If no match was found, then we've found a slave with a permanent address
1158 * that isn't used by any other slave in the bond, so we can assign it to
1161 * assumption: this function is called before @slave is attached to the
1164 static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slave *slave)
1166 struct slave *has_bond_addr = rcu_access_pointer(bond->curr_active_slave);
1167 struct slave *tmp_slave1, *free_mac_slave = NULL;
1168 struct list_head *iter;
1170 if (!bond_has_slaves(bond)) {
1171 /* this is the first slave */
1175 /* if slave's mac address differs from bond's mac address
1176 * check uniqueness of slave's mac address against the other
1177 * slaves in the bond.
1179 if (!ether_addr_equal_64bits(slave->perm_hwaddr, bond->dev->dev_addr)) {
1180 if (!bond_slave_has_mac(bond, slave->dev->dev_addr))
1183 /* Try setting slave mac to bond address and fall-through
1184 * to code handling that situation below...
1186 alb_set_slave_mac_addr(slave, bond->dev->dev_addr,
1187 bond->dev->addr_len);
1190 /* The slave's address is equal to the address of the bond.
1191 * Search for a spare address in the bond for this slave.
1193 bond_for_each_slave(bond, tmp_slave1, iter) {
1194 if (!bond_slave_has_mac(bond, tmp_slave1->perm_hwaddr)) {
1195 /* no slave has tmp_slave1's perm addr
1198 free_mac_slave = tmp_slave1;
1202 if (!has_bond_addr) {
1203 if (ether_addr_equal_64bits(tmp_slave1->dev->dev_addr,
1204 bond->dev->dev_addr)) {
1206 has_bond_addr = tmp_slave1;
1211 if (free_mac_slave) {
1212 alb_set_slave_mac_addr(slave, free_mac_slave->perm_hwaddr,
1213 free_mac_slave->dev->addr_len);
1215 netdev_warn(bond->dev, "the hw address of slave %s is in use by the bond; giving it the hw address of %s\n",
1216 slave->dev->name, free_mac_slave->dev->name);
1218 } else if (has_bond_addr) {
1219 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",
1228 * alb_set_mac_address
1232 * In TLB mode all slaves are configured to the bond's hw address, but set
1233 * their dev_addr field to different addresses (based on their permanent hw
1236 * For each slave, this function sets the interface to the new address and then
1237 * changes its dev_addr field to its previous value.
1239 * Unwinding assumes bond's mac address has not yet changed.
1241 static int alb_set_mac_address(struct bonding *bond, void *addr)
1243 struct slave *slave, *rollback_slave;
1244 struct list_head *iter;
1245 struct sockaddr_storage ss;
1246 char tmp_addr[MAX_ADDR_LEN];
1249 if (bond->alb_info.rlb_enabled)
1252 bond_for_each_slave(bond, slave, iter) {
1253 /* save net_device's current hw address */
1254 bond_hw_addr_copy(tmp_addr, slave->dev->dev_addr,
1255 slave->dev->addr_len);
1257 res = dev_set_mac_address(slave->dev, addr);
1259 /* restore net_device's hw address */
1260 bond_hw_addr_copy(slave->dev->dev_addr, tmp_addr,
1261 slave->dev->addr_len);
1270 memcpy(ss.__data, bond->dev->dev_addr, bond->dev->addr_len);
1271 ss.ss_family = bond->dev->type;
1273 /* unwind from head to the slave that failed */
1274 bond_for_each_slave(bond, rollback_slave, iter) {
1275 if (rollback_slave == slave)
1277 bond_hw_addr_copy(tmp_addr, rollback_slave->dev->dev_addr,
1278 rollback_slave->dev->addr_len);
1279 dev_set_mac_address(rollback_slave->dev,
1280 (struct sockaddr *)&ss);
1281 bond_hw_addr_copy(rollback_slave->dev->dev_addr, tmp_addr,
1282 rollback_slave->dev->addr_len);
1288 /************************ exported alb funcions ************************/
1290 int bond_alb_initialize(struct bonding *bond, int rlb_enabled)
1294 res = tlb_initialize(bond);
1299 bond->alb_info.rlb_enabled = 1;
1300 res = rlb_initialize(bond);
1302 tlb_deinitialize(bond);
1306 bond->alb_info.rlb_enabled = 0;
1312 void bond_alb_deinitialize(struct bonding *bond)
1314 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1316 tlb_deinitialize(bond);
1318 if (bond_info->rlb_enabled)
1319 rlb_deinitialize(bond);
1322 static int bond_do_alb_xmit(struct sk_buff *skb, struct bonding *bond,
1323 struct slave *tx_slave)
1325 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1326 struct ethhdr *eth_data = eth_hdr(skb);
1329 /* unbalanced or unassigned, send through primary */
1330 tx_slave = rcu_dereference(bond->curr_active_slave);
1331 if (bond->params.tlb_dynamic_lb)
1332 bond_info->unbalanced_load += skb->len;
1335 if (tx_slave && bond_slave_can_tx(tx_slave)) {
1336 if (tx_slave != rcu_access_pointer(bond->curr_active_slave)) {
1337 ether_addr_copy(eth_data->h_source,
1338 tx_slave->dev->dev_addr);
1341 bond_dev_queue_xmit(bond, skb, tx_slave->dev);
1345 if (tx_slave && bond->params.tlb_dynamic_lb) {
1346 spin_lock(&bond->mode_lock);
1347 __tlb_clear_slave(bond, tx_slave, 0);
1348 spin_unlock(&bond->mode_lock);
1351 /* no suitable interface, frame not sent */
1352 bond_tx_drop(bond->dev, skb);
1354 return NETDEV_TX_OK;
1357 int bond_tlb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
1359 struct bonding *bond = netdev_priv(bond_dev);
1360 struct ethhdr *eth_data;
1361 struct slave *tx_slave = NULL;
1364 skb_reset_mac_header(skb);
1365 eth_data = eth_hdr(skb);
1367 /* Do not TX balance any multicast or broadcast */
1368 if (!is_multicast_ether_addr(eth_data->h_dest)) {
1369 switch (skb->protocol) {
1370 case htons(ETH_P_IP):
1371 case htons(ETH_P_IPX):
1372 /* In case of IPX, it will falback to L2 hash */
1373 case htons(ETH_P_IPV6):
1374 hash_index = bond_xmit_hash(bond, skb);
1375 if (bond->params.tlb_dynamic_lb) {
1376 tx_slave = tlb_choose_channel(bond,
1380 struct bond_up_slave *slaves;
1383 slaves = rcu_dereference(bond->slave_arr);
1384 count = slaves ? ACCESS_ONCE(slaves->count) : 0;
1386 tx_slave = slaves->arr[hash_index %
1392 return bond_do_alb_xmit(skb, bond, tx_slave);
1395 int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
1397 struct bonding *bond = netdev_priv(bond_dev);
1398 struct ethhdr *eth_data;
1399 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1400 struct slave *tx_slave = NULL;
1401 static const __be32 ip_bcast = htonl(0xffffffff);
1403 bool do_tx_balance = true;
1405 const u8 *hash_start = NULL;
1407 skb_reset_mac_header(skb);
1408 eth_data = eth_hdr(skb);
1410 switch (ntohs(skb->protocol)) {
1412 const struct iphdr *iph;
1414 if (ether_addr_equal_64bits(eth_data->h_dest, mac_bcast) ||
1415 (!pskb_network_may_pull(skb, sizeof(*iph)))) {
1416 do_tx_balance = false;
1420 if (iph->daddr == ip_bcast || iph->protocol == IPPROTO_IGMP) {
1421 do_tx_balance = false;
1424 hash_start = (char *)&(iph->daddr);
1425 hash_size = sizeof(iph->daddr);
1429 const struct ipv6hdr *ip6hdr;
1431 /* IPv6 doesn't really use broadcast mac address, but leave
1432 * that here just in case.
1434 if (ether_addr_equal_64bits(eth_data->h_dest, mac_bcast)) {
1435 do_tx_balance = false;
1439 /* IPv6 uses all-nodes multicast as an equivalent to
1440 * broadcasts in IPv4.
1442 if (ether_addr_equal_64bits(eth_data->h_dest, mac_v6_allmcast)) {
1443 do_tx_balance = false;
1447 if (!pskb_network_may_pull(skb, sizeof(*ip6hdr))) {
1448 do_tx_balance = false;
1451 /* Additionally, DAD probes should not be tx-balanced as that
1452 * will lead to false positives for duplicate addresses and
1453 * prevent address configuration from working.
1455 ip6hdr = ipv6_hdr(skb);
1456 if (ipv6_addr_any(&ip6hdr->saddr)) {
1457 do_tx_balance = false;
1461 hash_start = (char *)&ip6hdr->daddr;
1462 hash_size = sizeof(ip6hdr->daddr);
1466 const struct ipxhdr *ipxhdr;
1468 if (pskb_network_may_pull(skb, sizeof(*ipxhdr))) {
1469 do_tx_balance = false;
1472 ipxhdr = (struct ipxhdr *)skb_network_header(skb);
1474 if (ipxhdr->ipx_checksum != IPX_NO_CHECKSUM) {
1475 /* something is wrong with this packet */
1476 do_tx_balance = false;
1480 if (ipxhdr->ipx_type != IPX_TYPE_NCP) {
1481 /* The only protocol worth balancing in
1482 * this family since it has an "ARP" like
1485 do_tx_balance = false;
1489 eth_data = eth_hdr(skb);
1490 hash_start = (char *)eth_data->h_dest;
1491 hash_size = ETH_ALEN;
1495 do_tx_balance = false;
1496 if (bond_info->rlb_enabled)
1497 tx_slave = rlb_arp_xmit(skb, bond);
1500 do_tx_balance = false;
1504 if (do_tx_balance) {
1505 hash_index = _simple_hash(hash_start, hash_size);
1506 tx_slave = tlb_choose_channel(bond, hash_index, skb->len);
1509 return bond_do_alb_xmit(skb, bond, tx_slave);
1512 void bond_alb_monitor(struct work_struct *work)
1514 struct bonding *bond = container_of(work, struct bonding,
1516 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1517 struct list_head *iter;
1518 struct slave *slave;
1520 if (!bond_has_slaves(bond)) {
1521 bond_info->tx_rebalance_counter = 0;
1522 bond_info->lp_counter = 0;
1528 bond_info->tx_rebalance_counter++;
1529 bond_info->lp_counter++;
1531 /* send learning packets */
1532 if (bond_info->lp_counter >= BOND_ALB_LP_TICKS(bond)) {
1535 bond_for_each_slave_rcu(bond, slave, iter) {
1536 /* If updating current_active, use all currently
1537 * user mac addreses (!strict_match). Otherwise, only
1538 * use mac of the slave device.
1539 * In RLB mode, we always use strict matches.
1541 strict_match = (slave != rcu_access_pointer(bond->curr_active_slave) ||
1542 bond_info->rlb_enabled);
1543 alb_send_learning_packets(slave, slave->dev->dev_addr,
1546 bond_info->lp_counter = 0;
1549 /* rebalance tx traffic */
1550 if (bond_info->tx_rebalance_counter >= BOND_TLB_REBALANCE_TICKS) {
1551 bond_for_each_slave_rcu(bond, slave, iter) {
1552 tlb_clear_slave(bond, slave, 1);
1553 if (slave == rcu_access_pointer(bond->curr_active_slave)) {
1554 SLAVE_TLB_INFO(slave).load =
1555 bond_info->unbalanced_load /
1556 BOND_TLB_REBALANCE_INTERVAL;
1557 bond_info->unbalanced_load = 0;
1560 bond_info->tx_rebalance_counter = 0;
1563 if (bond_info->rlb_enabled) {
1564 if (bond_info->primary_is_promisc &&
1565 (++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) {
1567 /* dev_set_promiscuity requires rtnl and
1568 * nothing else. Avoid race with bond_close.
1571 if (!rtnl_trylock())
1574 bond_info->rlb_promisc_timeout_counter = 0;
1576 /* If the primary was set to promiscuous mode
1577 * because a slave was disabled then
1578 * it can now leave promiscuous mode.
1580 dev_set_promiscuity(rtnl_dereference(bond->curr_active_slave)->dev,
1582 bond_info->primary_is_promisc = 0;
1588 if (bond_info->rlb_rebalance) {
1589 bond_info->rlb_rebalance = 0;
1590 rlb_rebalance(bond);
1593 /* check if clients need updating */
1594 if (bond_info->rx_ntt) {
1595 if (bond_info->rlb_update_delay_counter) {
1596 --bond_info->rlb_update_delay_counter;
1598 rlb_update_rx_clients(bond);
1599 if (bond_info->rlb_update_retry_counter)
1600 --bond_info->rlb_update_retry_counter;
1602 bond_info->rx_ntt = 0;
1608 queue_delayed_work(bond->wq, &bond->alb_work, alb_delta_in_ticks);
1611 /* assumption: called before the slave is attached to the bond
1612 * and not locked by the bond lock
1614 int bond_alb_init_slave(struct bonding *bond, struct slave *slave)
1618 res = alb_set_slave_mac_addr(slave, slave->perm_hwaddr,
1619 slave->dev->addr_len);
1623 res = alb_handle_addr_collision_on_attach(bond, slave);
1627 tlb_init_slave(slave);
1629 /* order a rebalance ASAP */
1630 bond->alb_info.tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS;
1632 if (bond->alb_info.rlb_enabled)
1633 bond->alb_info.rlb_rebalance = 1;
1638 /* Remove slave from tlb and rlb hash tables, and fix up MAC addresses
1641 * Caller must hold RTNL and no other locks
1643 void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave)
1645 if (bond_has_slaves(bond))
1646 alb_change_hw_addr_on_detach(bond, slave);
1648 tlb_clear_slave(bond, slave, 0);
1650 if (bond->alb_info.rlb_enabled) {
1651 bond->alb_info.rx_slave = NULL;
1652 rlb_clear_slave(bond, slave);
1657 void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link)
1659 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1661 if (link == BOND_LINK_DOWN) {
1662 tlb_clear_slave(bond, slave, 0);
1663 if (bond->alb_info.rlb_enabled)
1664 rlb_clear_slave(bond, slave);
1665 } else if (link == BOND_LINK_UP) {
1666 /* order a rebalance ASAP */
1667 bond_info->tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS;
1668 if (bond->alb_info.rlb_enabled) {
1669 bond->alb_info.rlb_rebalance = 1;
1670 /* If the updelay module parameter is smaller than the
1671 * forwarding delay of the switch the rebalance will
1672 * not work because the rebalance arp replies will
1673 * not be forwarded to the clients..
1678 if (bond_is_nondyn_tlb(bond)) {
1679 if (bond_update_slave_arr(bond, NULL))
1680 pr_err("Failed to build slave-array for TLB mode.\n");
1685 * bond_alb_handle_active_change - assign new curr_active_slave
1686 * @bond: our bonding struct
1687 * @new_slave: new slave to assign
1689 * Set the bond->curr_active_slave to @new_slave and handle
1690 * mac address swapping and promiscuity changes as needed.
1692 * Caller must hold RTNL
1694 void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave)
1696 struct slave *swap_slave;
1697 struct slave *curr_active;
1699 curr_active = rtnl_dereference(bond->curr_active_slave);
1700 if (curr_active == new_slave)
1703 if (curr_active && bond->alb_info.primary_is_promisc) {
1704 dev_set_promiscuity(curr_active->dev, -1);
1705 bond->alb_info.primary_is_promisc = 0;
1706 bond->alb_info.rlb_promisc_timeout_counter = 0;
1709 swap_slave = curr_active;
1710 rcu_assign_pointer(bond->curr_active_slave, new_slave);
1712 if (!new_slave || !bond_has_slaves(bond))
1715 /* set the new curr_active_slave to the bonds mac address
1716 * i.e. swap mac addresses of old curr_active_slave and new curr_active_slave
1719 swap_slave = bond_slave_has_mac(bond, bond->dev->dev_addr);
1721 /* Arrange for swap_slave and new_slave to temporarily be
1722 * ignored so we can mess with their MAC addresses without
1723 * fear of interference from transmit activity.
1726 tlb_clear_slave(bond, swap_slave, 1);
1727 tlb_clear_slave(bond, new_slave, 1);
1729 /* in TLB mode, the slave might flip down/up with the old dev_addr,
1730 * and thus filter bond->dev_addr's packets, so force bond's mac
1732 if (BOND_MODE(bond) == BOND_MODE_TLB) {
1733 struct sockaddr_storage ss;
1734 u8 tmp_addr[MAX_ADDR_LEN];
1736 bond_hw_addr_copy(tmp_addr, new_slave->dev->dev_addr,
1737 new_slave->dev->addr_len);
1739 bond_hw_addr_copy(ss.__data, bond->dev->dev_addr,
1740 bond->dev->addr_len);
1741 ss.ss_family = bond->dev->type;
1742 /* we don't care if it can't change its mac, best effort */
1743 dev_set_mac_address(new_slave->dev, (struct sockaddr *)&ss);
1745 bond_hw_addr_copy(new_slave->dev->dev_addr, tmp_addr,
1746 new_slave->dev->addr_len);
1749 /* curr_active_slave must be set before calling alb_swap_mac_addr */
1751 /* swap mac address */
1752 alb_swap_mac_addr(swap_slave, new_slave);
1753 alb_fasten_mac_swap(bond, swap_slave, new_slave);
1755 /* set the new_slave to the bond mac address */
1756 alb_set_slave_mac_addr(new_slave, bond->dev->dev_addr,
1757 bond->dev->addr_len);
1758 alb_send_learning_packets(new_slave, bond->dev->dev_addr,
1763 /* Called with RTNL */
1764 int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr)
1766 struct bonding *bond = netdev_priv(bond_dev);
1767 struct sockaddr_storage *ss = addr;
1768 struct slave *curr_active;
1769 struct slave *swap_slave;
1772 if (!is_valid_ether_addr(ss->__data))
1773 return -EADDRNOTAVAIL;
1775 res = alb_set_mac_address(bond, addr);
1779 bond_hw_addr_copy(bond_dev->dev_addr, ss->__data, bond_dev->addr_len);
1781 /* If there is no curr_active_slave there is nothing else to do.
1782 * Otherwise we'll need to pass the new address to it and handle
1785 curr_active = rtnl_dereference(bond->curr_active_slave);
1789 swap_slave = bond_slave_has_mac(bond, bond_dev->dev_addr);
1792 alb_swap_mac_addr(swap_slave, curr_active);
1793 alb_fasten_mac_swap(bond, swap_slave, curr_active);
1795 alb_set_slave_mac_addr(curr_active, bond_dev->dev_addr,
1796 bond_dev->addr_len);
1798 alb_send_learning_packets(curr_active,
1799 bond_dev->dev_addr, false);
1800 if (bond->alb_info.rlb_enabled) {
1801 /* inform clients mac address has changed */
1802 rlb_req_update_slave_clients(bond, curr_active);
1809 void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
1811 if (bond->alb_info.rlb_enabled)
1812 rlb_clear_vlan(bond, vlan_id);