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 static inline struct arp_pkt *arp_pkt(const struct sk_buff *skb)
76 return (struct arp_pkt *)skb_network_header(skb);
79 /* Forward declaration */
80 static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[],
82 static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp);
83 static void rlb_src_unlink(struct bonding *bond, u32 index);
84 static void rlb_src_link(struct bonding *bond, u32 ip_src_hash,
87 static inline u8 _simple_hash(const u8 *hash_start, int hash_size)
92 for (i = 0; i < hash_size; i++)
93 hash ^= hash_start[i];
98 /*********************** tlb specific functions ***************************/
100 static inline void tlb_init_table_entry(struct tlb_client_info *entry, int save_load)
103 entry->load_history = 1 + entry->tx_bytes /
104 BOND_TLB_REBALANCE_INTERVAL;
108 entry->tx_slave = NULL;
109 entry->next = TLB_NULL_INDEX;
110 entry->prev = TLB_NULL_INDEX;
113 static inline void tlb_init_slave(struct slave *slave)
115 SLAVE_TLB_INFO(slave).load = 0;
116 SLAVE_TLB_INFO(slave).head = TLB_NULL_INDEX;
119 static void __tlb_clear_slave(struct bonding *bond, struct slave *slave,
122 struct tlb_client_info *tx_hash_table;
125 /* clear slave from tx_hashtbl */
126 tx_hash_table = BOND_ALB_INFO(bond).tx_hashtbl;
128 /* skip this if we've already freed the tx hash table */
130 index = SLAVE_TLB_INFO(slave).head;
131 while (index != TLB_NULL_INDEX) {
132 u32 next_index = tx_hash_table[index].next;
133 tlb_init_table_entry(&tx_hash_table[index], save_load);
138 tlb_init_slave(slave);
141 static void tlb_clear_slave(struct bonding *bond, struct slave *slave,
144 spin_lock_bh(&bond->mode_lock);
145 __tlb_clear_slave(bond, slave, save_load);
146 spin_unlock_bh(&bond->mode_lock);
149 /* Must be called before starting the monitor timer */
150 static int tlb_initialize(struct bonding *bond)
152 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
153 int size = TLB_HASH_TABLE_SIZE * sizeof(struct tlb_client_info);
154 struct tlb_client_info *new_hashtbl;
157 new_hashtbl = kzalloc(size, GFP_KERNEL);
161 spin_lock_bh(&bond->mode_lock);
163 bond_info->tx_hashtbl = new_hashtbl;
165 for (i = 0; i < TLB_HASH_TABLE_SIZE; i++)
166 tlb_init_table_entry(&bond_info->tx_hashtbl[i], 0);
168 spin_unlock_bh(&bond->mode_lock);
173 /* Must be called only after all slaves have been released */
174 static void tlb_deinitialize(struct bonding *bond)
176 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
178 spin_lock_bh(&bond->mode_lock);
180 kfree(bond_info->tx_hashtbl);
181 bond_info->tx_hashtbl = NULL;
183 spin_unlock_bh(&bond->mode_lock);
186 static long long compute_gap(struct slave *slave)
188 return (s64) (slave->speed << 20) - /* Convert to Megabit per sec */
189 (s64) (SLAVE_TLB_INFO(slave).load << 3); /* Bytes to bits */
192 static struct slave *tlb_get_least_loaded_slave(struct bonding *bond)
194 struct slave *slave, *least_loaded;
195 struct list_head *iter;
201 /* Find the slave with the largest gap */
202 bond_for_each_slave_rcu(bond, slave, iter) {
203 if (bond_slave_can_tx(slave)) {
204 long long gap = compute_gap(slave);
207 least_loaded = slave;
216 static struct slave *__tlb_choose_channel(struct bonding *bond, u32 hash_index,
219 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
220 struct tlb_client_info *hash_table;
221 struct slave *assigned_slave;
223 hash_table = bond_info->tx_hashtbl;
224 assigned_slave = hash_table[hash_index].tx_slave;
225 if (!assigned_slave) {
226 assigned_slave = tlb_get_least_loaded_slave(bond);
228 if (assigned_slave) {
229 struct tlb_slave_info *slave_info =
230 &(SLAVE_TLB_INFO(assigned_slave));
231 u32 next_index = slave_info->head;
233 hash_table[hash_index].tx_slave = assigned_slave;
234 hash_table[hash_index].next = next_index;
235 hash_table[hash_index].prev = TLB_NULL_INDEX;
237 if (next_index != TLB_NULL_INDEX)
238 hash_table[next_index].prev = hash_index;
240 slave_info->head = hash_index;
242 hash_table[hash_index].load_history;
247 hash_table[hash_index].tx_bytes += skb_len;
249 return assigned_slave;
252 static struct slave *tlb_choose_channel(struct bonding *bond, u32 hash_index,
255 struct slave *tx_slave;
257 /* We don't need to disable softirq here, becase
258 * tlb_choose_channel() is only called by bond_alb_xmit()
259 * which already has softirq disabled.
261 spin_lock(&bond->mode_lock);
262 tx_slave = __tlb_choose_channel(bond, hash_index, skb_len);
263 spin_unlock(&bond->mode_lock);
268 /*********************** rlb specific functions ***************************/
270 /* when an ARP REPLY is received from a client update its info
273 static void rlb_update_entry_from_arp(struct bonding *bond, struct arp_pkt *arp)
275 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
276 struct rlb_client_info *client_info;
279 spin_lock_bh(&bond->mode_lock);
281 hash_index = _simple_hash((u8 *)&(arp->ip_src), sizeof(arp->ip_src));
282 client_info = &(bond_info->rx_hashtbl[hash_index]);
284 if ((client_info->assigned) &&
285 (client_info->ip_src == arp->ip_dst) &&
286 (client_info->ip_dst == arp->ip_src) &&
287 (!ether_addr_equal_64bits(client_info->mac_dst, arp->mac_src))) {
288 /* update the clients MAC address */
289 ether_addr_copy(client_info->mac_dst, arp->mac_src);
290 client_info->ntt = 1;
291 bond_info->rx_ntt = 1;
294 spin_unlock_bh(&bond->mode_lock);
297 static int rlb_arp_recv(const struct sk_buff *skb, struct bonding *bond,
300 struct arp_pkt *arp, _arp;
302 if (skb->protocol != cpu_to_be16(ETH_P_ARP))
305 arp = skb_header_pointer(skb, 0, sizeof(_arp), &_arp);
309 /* We received an ARP from arp->ip_src.
310 * We might have used this IP address previously (on the bonding host
311 * itself or on a system that is bridged together with the bond).
312 * However, if arp->mac_src is different than what is stored in
313 * rx_hashtbl, some other host is now using the IP and we must prevent
314 * sending out client updates with this IP address and the old MAC
316 * Clean up all hash table entries that have this address as ip_src but
317 * have a different mac_src.
319 rlb_purge_src_ip(bond, arp);
321 if (arp->op_code == htons(ARPOP_REPLY)) {
322 /* update rx hash table for this ARP */
323 rlb_update_entry_from_arp(bond, arp);
324 netdev_dbg(bond->dev, "Server received an ARP Reply from client\n");
327 return RX_HANDLER_ANOTHER;
330 /* Caller must hold rcu_read_lock() */
331 static struct slave *__rlb_next_rx_slave(struct bonding *bond)
333 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
334 struct slave *before = NULL, *rx_slave = NULL, *slave;
335 struct list_head *iter;
338 bond_for_each_slave_rcu(bond, slave, iter) {
339 if (!bond_slave_can_tx(slave))
342 if (!before || before->speed < slave->speed)
345 if (!rx_slave || rx_slave->speed < slave->speed)
348 if (slave == bond_info->rx_slave)
351 /* we didn't find anything after the current or we have something
352 * better before and up to the current slave
354 if (!rx_slave || (before && rx_slave->speed < before->speed))
358 bond_info->rx_slave = rx_slave;
363 /* Caller must hold RTNL, rcu_read_lock is obtained only to silence checkers */
364 static struct slave *rlb_next_rx_slave(struct bonding *bond)
366 struct slave *rx_slave;
371 rx_slave = __rlb_next_rx_slave(bond);
377 /* teach the switch the mac of a disabled slave
378 * on the primary for fault tolerance
380 * Caller must hold RTNL
382 static void rlb_teach_disabled_mac_on_primary(struct bonding *bond, u8 addr[])
384 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
389 if (!bond->alb_info.primary_is_promisc) {
390 if (!dev_set_promiscuity(curr_active->dev, 1))
391 bond->alb_info.primary_is_promisc = 1;
393 bond->alb_info.primary_is_promisc = 0;
396 bond->alb_info.rlb_promisc_timeout_counter = 0;
398 alb_send_learning_packets(curr_active, addr, true);
401 /* slave being removed should not be active at this point
403 * Caller must hold rtnl.
405 static void rlb_clear_slave(struct bonding *bond, struct slave *slave)
407 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
408 struct rlb_client_info *rx_hash_table;
409 u32 index, next_index;
411 /* clear slave from rx_hashtbl */
412 spin_lock_bh(&bond->mode_lock);
414 rx_hash_table = bond_info->rx_hashtbl;
415 index = bond_info->rx_hashtbl_used_head;
416 for (; index != RLB_NULL_INDEX; index = next_index) {
417 next_index = rx_hash_table[index].used_next;
418 if (rx_hash_table[index].slave == slave) {
419 struct slave *assigned_slave = rlb_next_rx_slave(bond);
421 if (assigned_slave) {
422 rx_hash_table[index].slave = assigned_slave;
423 if (!ether_addr_equal_64bits(rx_hash_table[index].mac_dst,
425 bond_info->rx_hashtbl[index].ntt = 1;
426 bond_info->rx_ntt = 1;
427 /* A slave has been removed from the
428 * table because it is either disabled
429 * or being released. We must retry the
430 * update to avoid clients from not
431 * being updated & disconnecting when
434 bond_info->rlb_update_retry_counter =
437 } else { /* there is no active slave */
438 rx_hash_table[index].slave = NULL;
443 spin_unlock_bh(&bond->mode_lock);
445 if (slave != rtnl_dereference(bond->curr_active_slave))
446 rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr);
449 static void rlb_update_client(struct rlb_client_info *client_info)
453 if (!client_info->slave)
456 for (i = 0; i < RLB_ARP_BURST_SIZE; i++) {
459 skb = arp_create(ARPOP_REPLY, ETH_P_ARP,
461 client_info->slave->dev,
463 client_info->mac_dst,
464 client_info->slave->dev->dev_addr,
465 client_info->mac_dst);
467 netdev_err(client_info->slave->bond->dev,
468 "failed to create an ARP packet\n");
472 skb->dev = client_info->slave->dev;
474 if (client_info->vlan_id) {
475 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
476 client_info->vlan_id);
483 /* sends ARP REPLIES that update the clients that need updating */
484 static void rlb_update_rx_clients(struct bonding *bond)
486 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
487 struct rlb_client_info *client_info;
490 spin_lock_bh(&bond->mode_lock);
492 hash_index = bond_info->rx_hashtbl_used_head;
493 for (; hash_index != RLB_NULL_INDEX;
494 hash_index = client_info->used_next) {
495 client_info = &(bond_info->rx_hashtbl[hash_index]);
496 if (client_info->ntt) {
497 rlb_update_client(client_info);
498 if (bond_info->rlb_update_retry_counter == 0)
499 client_info->ntt = 0;
503 /* do not update the entries again until this counter is zero so that
504 * not to confuse the clients.
506 bond_info->rlb_update_delay_counter = RLB_UPDATE_DELAY;
508 spin_unlock_bh(&bond->mode_lock);
511 /* The slave was assigned a new mac address - update the clients */
512 static void rlb_req_update_slave_clients(struct bonding *bond, struct slave *slave)
514 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
515 struct rlb_client_info *client_info;
519 spin_lock_bh(&bond->mode_lock);
521 hash_index = bond_info->rx_hashtbl_used_head;
522 for (; hash_index != RLB_NULL_INDEX;
523 hash_index = client_info->used_next) {
524 client_info = &(bond_info->rx_hashtbl[hash_index]);
526 if ((client_info->slave == slave) &&
527 !ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) {
528 client_info->ntt = 1;
533 /* update the team's flag only after the whole iteration */
535 bond_info->rx_ntt = 1;
536 /* fasten the change */
537 bond_info->rlb_update_retry_counter = RLB_UPDATE_RETRY;
540 spin_unlock_bh(&bond->mode_lock);
543 /* mark all clients using src_ip to be updated */
544 static void rlb_req_update_subnet_clients(struct bonding *bond, __be32 src_ip)
546 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
547 struct rlb_client_info *client_info;
550 spin_lock(&bond->mode_lock);
552 hash_index = bond_info->rx_hashtbl_used_head;
553 for (; hash_index != RLB_NULL_INDEX;
554 hash_index = client_info->used_next) {
555 client_info = &(bond_info->rx_hashtbl[hash_index]);
557 if (!client_info->slave) {
558 netdev_err(bond->dev, "found a client with no channel in the client's hash table\n");
561 /* update all clients using this src_ip, that are not assigned
562 * to the team's address (curr_active_slave) and have a known
563 * unicast mac address.
565 if ((client_info->ip_src == src_ip) &&
566 !ether_addr_equal_64bits(client_info->slave->dev->dev_addr,
567 bond->dev->dev_addr) &&
568 !ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) {
569 client_info->ntt = 1;
570 bond_info->rx_ntt = 1;
574 spin_unlock(&bond->mode_lock);
577 static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bond)
579 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
580 struct arp_pkt *arp = arp_pkt(skb);
581 struct slave *assigned_slave, *curr_active_slave;
582 struct rlb_client_info *client_info;
585 spin_lock(&bond->mode_lock);
587 curr_active_slave = rcu_dereference(bond->curr_active_slave);
589 hash_index = _simple_hash((u8 *)&arp->ip_dst, sizeof(arp->ip_dst));
590 client_info = &(bond_info->rx_hashtbl[hash_index]);
592 if (client_info->assigned) {
593 if ((client_info->ip_src == arp->ip_src) &&
594 (client_info->ip_dst == arp->ip_dst)) {
595 /* the entry is already assigned to this client */
596 if (!ether_addr_equal_64bits(arp->mac_dst, mac_bcast)) {
597 /* update mac address from arp */
598 ether_addr_copy(client_info->mac_dst, arp->mac_dst);
600 ether_addr_copy(client_info->mac_src, arp->mac_src);
602 assigned_slave = client_info->slave;
603 if (assigned_slave) {
604 spin_unlock(&bond->mode_lock);
605 return assigned_slave;
608 /* the entry is already assigned to some other client,
609 * move the old client to primary (curr_active_slave) so
610 * that the new client can be assigned to this entry.
612 if (curr_active_slave &&
613 client_info->slave != curr_active_slave) {
614 client_info->slave = curr_active_slave;
615 rlb_update_client(client_info);
619 /* assign a new slave */
620 assigned_slave = __rlb_next_rx_slave(bond);
622 if (assigned_slave) {
623 if (!(client_info->assigned &&
624 client_info->ip_src == arp->ip_src)) {
625 /* ip_src is going to be updated,
626 * fix the src hash list
628 u32 hash_src = _simple_hash((u8 *)&arp->ip_src,
629 sizeof(arp->ip_src));
630 rlb_src_unlink(bond, hash_index);
631 rlb_src_link(bond, hash_src, hash_index);
634 client_info->ip_src = arp->ip_src;
635 client_info->ip_dst = arp->ip_dst;
636 /* arp->mac_dst is broadcast for arp reqeusts.
637 * will be updated with clients actual unicast mac address
638 * upon receiving an arp reply.
640 ether_addr_copy(client_info->mac_dst, arp->mac_dst);
641 ether_addr_copy(client_info->mac_src, arp->mac_src);
642 client_info->slave = assigned_slave;
644 if (!ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) {
645 client_info->ntt = 1;
646 bond->alb_info.rx_ntt = 1;
648 client_info->ntt = 0;
651 if (vlan_get_tag(skb, &client_info->vlan_id))
652 client_info->vlan_id = 0;
654 if (!client_info->assigned) {
655 u32 prev_tbl_head = bond_info->rx_hashtbl_used_head;
656 bond_info->rx_hashtbl_used_head = hash_index;
657 client_info->used_next = prev_tbl_head;
658 if (prev_tbl_head != RLB_NULL_INDEX) {
659 bond_info->rx_hashtbl[prev_tbl_head].used_prev =
662 client_info->assigned = 1;
666 spin_unlock(&bond->mode_lock);
668 return assigned_slave;
671 /* chooses (and returns) transmit channel for arp reply
672 * does not choose channel for other arp types since they are
673 * sent on the curr_active_slave
675 static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond)
677 struct arp_pkt *arp = arp_pkt(skb);
678 struct slave *tx_slave = NULL;
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);
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);
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);
930 memset(&pkt, 0, size);
931 ether_addr_copy(pkt.mac_dst, mac_addr);
932 ether_addr_copy(pkt.mac_src, mac_addr);
933 pkt.type = cpu_to_be16(ETH_P_LOOPBACK);
935 skb = dev_alloc_skb(size);
939 data = skb_put(skb, size);
940 memcpy(data, &pkt, size);
942 skb_reset_mac_header(skb);
943 skb->network_header = skb->mac_header + ETH_HLEN;
944 skb->protocol = pkt.type;
945 skb->priority = TC_PRIO_CONTROL;
946 skb->dev = slave->dev;
949 __vlan_hwaccel_put_tag(skb, vlan_proto, vid);
954 struct alb_walk_data {
955 struct bonding *bond;
961 static int alb_upper_dev_walk(struct net_device *upper, void *_data)
963 struct alb_walk_data *data = _data;
964 bool strict_match = data->strict_match;
965 struct bonding *bond = data->bond;
966 struct slave *slave = data->slave;
967 u8 *mac_addr = data->mac_addr;
968 struct bond_vlan_tag *tags;
970 if (is_vlan_dev(upper) && vlan_get_encap_level(upper) == 0) {
972 ether_addr_equal_64bits(mac_addr,
974 alb_send_lp_vid(slave, mac_addr,
975 vlan_dev_vlan_proto(upper),
976 vlan_dev_vlan_id(upper));
977 } else if (!strict_match) {
978 alb_send_lp_vid(slave, upper->dev_addr,
979 vlan_dev_vlan_proto(upper),
980 vlan_dev_vlan_id(upper));
984 /* If this is a macvlan device, then only send updates
985 * when strict_match is turned off.
987 if (netif_is_macvlan(upper) && !strict_match) {
988 tags = bond_verify_device_path(bond->dev, upper, 0);
989 if (IS_ERR_OR_NULL(tags))
991 alb_send_lp_vid(slave, upper->dev_addr,
992 tags[0].vlan_proto, tags[0].vlan_id);
999 static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[],
1002 struct bonding *bond = bond_get_bond_by_slave(slave);
1003 struct alb_walk_data data = {
1004 .strict_match = strict_match,
1005 .mac_addr = mac_addr,
1011 alb_send_lp_vid(slave, mac_addr, 0, 0);
1013 /* loop through all devices and see if we need to send a packet
1017 netdev_walk_all_upper_dev_rcu(bond->dev, alb_upper_dev_walk, &data);
1021 static int alb_set_slave_mac_addr(struct slave *slave, u8 addr[],
1024 struct net_device *dev = slave->dev;
1025 struct sockaddr_storage ss;
1027 if (BOND_MODE(slave->bond) == BOND_MODE_TLB) {
1028 memcpy(dev->dev_addr, addr, len);
1032 /* for rlb each slave must have a unique hw mac addresses so that
1033 * each slave will receive packets destined to a different mac
1035 memcpy(ss.__data, addr, len);
1036 ss.ss_family = dev->type;
1037 if (dev_set_mac_address(dev, (struct sockaddr *)&ss)) {
1038 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",
1045 /* Swap MAC addresses between two slaves.
1047 * Called with RTNL held, and no other locks.
1049 static void alb_swap_mac_addr(struct slave *slave1, struct slave *slave2)
1051 u8 tmp_mac_addr[MAX_ADDR_LEN];
1053 bond_hw_addr_copy(tmp_mac_addr, slave1->dev->dev_addr,
1054 slave1->dev->addr_len);
1055 alb_set_slave_mac_addr(slave1, slave2->dev->dev_addr,
1056 slave2->dev->addr_len);
1057 alb_set_slave_mac_addr(slave2, tmp_mac_addr,
1058 slave1->dev->addr_len);
1062 /* Send learning packets after MAC address swap.
1064 * Called with RTNL and no other locks
1066 static void alb_fasten_mac_swap(struct bonding *bond, struct slave *slave1,
1067 struct slave *slave2)
1069 int slaves_state_differ = (bond_slave_can_tx(slave1) != bond_slave_can_tx(slave2));
1070 struct slave *disabled_slave = NULL;
1074 /* fasten the change in the switch */
1075 if (bond_slave_can_tx(slave1)) {
1076 alb_send_learning_packets(slave1, slave1->dev->dev_addr, false);
1077 if (bond->alb_info.rlb_enabled) {
1078 /* inform the clients that the mac address
1081 rlb_req_update_slave_clients(bond, slave1);
1084 disabled_slave = slave1;
1087 if (bond_slave_can_tx(slave2)) {
1088 alb_send_learning_packets(slave2, slave2->dev->dev_addr, false);
1089 if (bond->alb_info.rlb_enabled) {
1090 /* inform the clients that the mac address
1093 rlb_req_update_slave_clients(bond, slave2);
1096 disabled_slave = slave2;
1099 if (bond->alb_info.rlb_enabled && slaves_state_differ) {
1100 /* A disabled slave was assigned an active mac addr */
1101 rlb_teach_disabled_mac_on_primary(bond,
1102 disabled_slave->dev->dev_addr);
1107 * alb_change_hw_addr_on_detach
1108 * @bond: bonding we're working on
1109 * @slave: the slave that was just detached
1111 * We assume that @slave was already detached from the slave list.
1113 * If @slave's permanent hw address is different both from its current
1114 * address and from @bond's address, then somewhere in the bond there's
1115 * a slave that has @slave's permanet address as its current address.
1116 * We'll make sure that that slave no longer uses @slave's permanent address.
1118 * Caller must hold RTNL and no other locks
1120 static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *slave)
1124 struct slave *found_slave;
1126 perm_curr_diff = !ether_addr_equal_64bits(slave->perm_hwaddr,
1127 slave->dev->dev_addr);
1128 perm_bond_diff = !ether_addr_equal_64bits(slave->perm_hwaddr,
1129 bond->dev->dev_addr);
1131 if (perm_curr_diff && perm_bond_diff) {
1132 found_slave = bond_slave_has_mac(bond, slave->perm_hwaddr);
1135 alb_swap_mac_addr(slave, found_slave);
1136 alb_fasten_mac_swap(bond, slave, found_slave);
1142 * alb_handle_addr_collision_on_attach
1143 * @bond: bonding we're working on
1144 * @slave: the slave that was just attached
1146 * checks uniqueness of slave's mac address and handles the case the
1147 * new slave uses the bonds mac address.
1149 * If the permanent hw address of @slave is @bond's hw address, we need to
1150 * find a different hw address to give @slave, that isn't in use by any other
1151 * slave in the bond. This address must be, of course, one of the permanent
1152 * addresses of the other slaves.
1154 * We go over the slave list, and for each slave there we compare its
1155 * permanent hw address with the current address of all the other slaves.
1156 * If no match was found, then we've found a slave with a permanent address
1157 * that isn't used by any other slave in the bond, so we can assign it to
1160 * assumption: this function is called before @slave is attached to the
1163 static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slave *slave)
1165 struct slave *has_bond_addr = rcu_access_pointer(bond->curr_active_slave);
1166 struct slave *tmp_slave1, *free_mac_slave = NULL;
1167 struct list_head *iter;
1169 if (!bond_has_slaves(bond)) {
1170 /* this is the first slave */
1174 /* if slave's mac address differs from bond's mac address
1175 * check uniqueness of slave's mac address against the other
1176 * slaves in the bond.
1178 if (!ether_addr_equal_64bits(slave->perm_hwaddr, bond->dev->dev_addr)) {
1179 if (!bond_slave_has_mac(bond, slave->dev->dev_addr))
1182 /* Try setting slave mac to bond address and fall-through
1183 * to code handling that situation below...
1185 alb_set_slave_mac_addr(slave, bond->dev->dev_addr,
1186 bond->dev->addr_len);
1189 /* The slave's address is equal to the address of the bond.
1190 * Search for a spare address in the bond for this slave.
1192 bond_for_each_slave(bond, tmp_slave1, iter) {
1193 if (!bond_slave_has_mac(bond, tmp_slave1->perm_hwaddr)) {
1194 /* no slave has tmp_slave1's perm addr
1197 free_mac_slave = tmp_slave1;
1201 if (!has_bond_addr) {
1202 if (ether_addr_equal_64bits(tmp_slave1->dev->dev_addr,
1203 bond->dev->dev_addr)) {
1205 has_bond_addr = tmp_slave1;
1210 if (free_mac_slave) {
1211 alb_set_slave_mac_addr(slave, free_mac_slave->perm_hwaddr,
1212 free_mac_slave->dev->addr_len);
1214 netdev_warn(bond->dev, "the hw address of slave %s is in use by the bond; giving it the hw address of %s\n",
1215 slave->dev->name, free_mac_slave->dev->name);
1217 } else if (has_bond_addr) {
1218 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",
1227 * alb_set_mac_address
1231 * In TLB mode all slaves are configured to the bond's hw address, but set
1232 * their dev_addr field to different addresses (based on their permanent hw
1235 * For each slave, this function sets the interface to the new address and then
1236 * changes its dev_addr field to its previous value.
1238 * Unwinding assumes bond's mac address has not yet changed.
1240 static int alb_set_mac_address(struct bonding *bond, void *addr)
1242 struct slave *slave, *rollback_slave;
1243 struct list_head *iter;
1244 struct sockaddr_storage ss;
1245 char tmp_addr[MAX_ADDR_LEN];
1248 if (bond->alb_info.rlb_enabled)
1251 bond_for_each_slave(bond, slave, iter) {
1252 /* save net_device's current hw address */
1253 bond_hw_addr_copy(tmp_addr, slave->dev->dev_addr,
1254 slave->dev->addr_len);
1256 res = dev_set_mac_address(slave->dev, addr);
1258 /* restore net_device's hw address */
1259 bond_hw_addr_copy(slave->dev->dev_addr, tmp_addr,
1260 slave->dev->addr_len);
1269 memcpy(ss.__data, bond->dev->dev_addr, bond->dev->addr_len);
1270 ss.ss_family = bond->dev->type;
1272 /* unwind from head to the slave that failed */
1273 bond_for_each_slave(bond, rollback_slave, iter) {
1274 if (rollback_slave == slave)
1276 bond_hw_addr_copy(tmp_addr, rollback_slave->dev->dev_addr,
1277 rollback_slave->dev->addr_len);
1278 dev_set_mac_address(rollback_slave->dev,
1279 (struct sockaddr *)&ss);
1280 bond_hw_addr_copy(rollback_slave->dev->dev_addr, tmp_addr,
1281 rollback_slave->dev->addr_len);
1287 /************************ exported alb funcions ************************/
1289 int bond_alb_initialize(struct bonding *bond, int rlb_enabled)
1293 res = tlb_initialize(bond);
1298 bond->alb_info.rlb_enabled = 1;
1299 res = rlb_initialize(bond);
1301 tlb_deinitialize(bond);
1305 bond->alb_info.rlb_enabled = 0;
1311 void bond_alb_deinitialize(struct bonding *bond)
1313 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1315 tlb_deinitialize(bond);
1317 if (bond_info->rlb_enabled)
1318 rlb_deinitialize(bond);
1321 static int bond_do_alb_xmit(struct sk_buff *skb, struct bonding *bond,
1322 struct slave *tx_slave)
1324 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1325 struct ethhdr *eth_data = eth_hdr(skb);
1328 /* unbalanced or unassigned, send through primary */
1329 tx_slave = rcu_dereference(bond->curr_active_slave);
1330 if (bond->params.tlb_dynamic_lb)
1331 bond_info->unbalanced_load += skb->len;
1334 if (tx_slave && bond_slave_can_tx(tx_slave)) {
1335 if (tx_slave != rcu_access_pointer(bond->curr_active_slave)) {
1336 ether_addr_copy(eth_data->h_source,
1337 tx_slave->dev->dev_addr);
1340 bond_dev_queue_xmit(bond, skb, tx_slave->dev);
1344 if (tx_slave && bond->params.tlb_dynamic_lb) {
1345 spin_lock(&bond->mode_lock);
1346 __tlb_clear_slave(bond, tx_slave, 0);
1347 spin_unlock(&bond->mode_lock);
1350 /* no suitable interface, frame not sent */
1351 bond_tx_drop(bond->dev, skb);
1353 return NETDEV_TX_OK;
1356 int bond_tlb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
1358 struct bonding *bond = netdev_priv(bond_dev);
1359 struct ethhdr *eth_data;
1360 struct slave *tx_slave = NULL;
1363 skb_reset_mac_header(skb);
1364 eth_data = eth_hdr(skb);
1366 /* Do not TX balance any multicast or broadcast */
1367 if (!is_multicast_ether_addr(eth_data->h_dest)) {
1368 switch (skb->protocol) {
1369 case htons(ETH_P_IP):
1370 case htons(ETH_P_IPX):
1371 /* In case of IPX, it will falback to L2 hash */
1372 case htons(ETH_P_IPV6):
1373 hash_index = bond_xmit_hash(bond, skb);
1374 if (bond->params.tlb_dynamic_lb) {
1375 tx_slave = tlb_choose_channel(bond,
1379 struct bond_up_slave *slaves;
1382 slaves = rcu_dereference(bond->slave_arr);
1383 count = slaves ? ACCESS_ONCE(slaves->count) : 0;
1385 tx_slave = slaves->arr[hash_index %
1391 return bond_do_alb_xmit(skb, bond, tx_slave);
1394 int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
1396 struct bonding *bond = netdev_priv(bond_dev);
1397 struct ethhdr *eth_data;
1398 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1399 struct slave *tx_slave = NULL;
1400 static const __be32 ip_bcast = htonl(0xffffffff);
1402 bool do_tx_balance = true;
1404 const u8 *hash_start = NULL;
1405 struct ipv6hdr *ip6hdr;
1407 skb_reset_mac_header(skb);
1408 eth_data = eth_hdr(skb);
1410 switch (ntohs(skb->protocol)) {
1412 const struct iphdr *iph = ip_hdr(skb);
1414 if (ether_addr_equal_64bits(eth_data->h_dest, mac_bcast) ||
1415 (iph->daddr == ip_bcast) ||
1416 (iph->protocol == IPPROTO_IGMP)) {
1417 do_tx_balance = false;
1420 hash_start = (char *)&(iph->daddr);
1421 hash_size = sizeof(iph->daddr);
1425 /* IPv6 doesn't really use broadcast mac address, but leave
1426 * that here just in case.
1428 if (ether_addr_equal_64bits(eth_data->h_dest, mac_bcast)) {
1429 do_tx_balance = false;
1433 /* IPv6 uses all-nodes multicast as an equivalent to
1434 * broadcasts in IPv4.
1436 if (ether_addr_equal_64bits(eth_data->h_dest, mac_v6_allmcast)) {
1437 do_tx_balance = false;
1441 /* Additianally, DAD probes should not be tx-balanced as that
1442 * will lead to false positives for duplicate addresses and
1443 * prevent address configuration from working.
1445 ip6hdr = ipv6_hdr(skb);
1446 if (ipv6_addr_any(&ip6hdr->saddr)) {
1447 do_tx_balance = false;
1451 hash_start = (char *)&(ipv6_hdr(skb)->daddr);
1452 hash_size = sizeof(ipv6_hdr(skb)->daddr);
1455 if (ipx_hdr(skb)->ipx_checksum != IPX_NO_CHECKSUM) {
1456 /* something is wrong with this packet */
1457 do_tx_balance = false;
1461 if (ipx_hdr(skb)->ipx_type != IPX_TYPE_NCP) {
1462 /* The only protocol worth balancing in
1463 * this family since it has an "ARP" like
1466 do_tx_balance = false;
1470 hash_start = (char *)eth_data->h_dest;
1471 hash_size = ETH_ALEN;
1474 do_tx_balance = false;
1475 if (bond_info->rlb_enabled)
1476 tx_slave = rlb_arp_xmit(skb, bond);
1479 do_tx_balance = false;
1483 if (do_tx_balance) {
1484 hash_index = _simple_hash(hash_start, hash_size);
1485 tx_slave = tlb_choose_channel(bond, hash_index, skb->len);
1488 return bond_do_alb_xmit(skb, bond, tx_slave);
1491 void bond_alb_monitor(struct work_struct *work)
1493 struct bonding *bond = container_of(work, struct bonding,
1495 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1496 struct list_head *iter;
1497 struct slave *slave;
1499 if (!bond_has_slaves(bond)) {
1500 bond_info->tx_rebalance_counter = 0;
1501 bond_info->lp_counter = 0;
1507 bond_info->tx_rebalance_counter++;
1508 bond_info->lp_counter++;
1510 /* send learning packets */
1511 if (bond_info->lp_counter >= BOND_ALB_LP_TICKS(bond)) {
1514 bond_for_each_slave_rcu(bond, slave, iter) {
1515 /* If updating current_active, use all currently
1516 * user mac addreses (!strict_match). Otherwise, only
1517 * use mac of the slave device.
1518 * In RLB mode, we always use strict matches.
1520 strict_match = (slave != rcu_access_pointer(bond->curr_active_slave) ||
1521 bond_info->rlb_enabled);
1522 alb_send_learning_packets(slave, slave->dev->dev_addr,
1525 bond_info->lp_counter = 0;
1528 /* rebalance tx traffic */
1529 if (bond_info->tx_rebalance_counter >= BOND_TLB_REBALANCE_TICKS) {
1530 bond_for_each_slave_rcu(bond, slave, iter) {
1531 tlb_clear_slave(bond, slave, 1);
1532 if (slave == rcu_access_pointer(bond->curr_active_slave)) {
1533 SLAVE_TLB_INFO(slave).load =
1534 bond_info->unbalanced_load /
1535 BOND_TLB_REBALANCE_INTERVAL;
1536 bond_info->unbalanced_load = 0;
1539 bond_info->tx_rebalance_counter = 0;
1542 if (bond_info->rlb_enabled) {
1543 if (bond_info->primary_is_promisc &&
1544 (++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) {
1546 /* dev_set_promiscuity requires rtnl and
1547 * nothing else. Avoid race with bond_close.
1550 if (!rtnl_trylock())
1553 bond_info->rlb_promisc_timeout_counter = 0;
1555 /* If the primary was set to promiscuous mode
1556 * because a slave was disabled then
1557 * it can now leave promiscuous mode.
1559 dev_set_promiscuity(rtnl_dereference(bond->curr_active_slave)->dev,
1561 bond_info->primary_is_promisc = 0;
1567 if (bond_info->rlb_rebalance) {
1568 bond_info->rlb_rebalance = 0;
1569 rlb_rebalance(bond);
1572 /* check if clients need updating */
1573 if (bond_info->rx_ntt) {
1574 if (bond_info->rlb_update_delay_counter) {
1575 --bond_info->rlb_update_delay_counter;
1577 rlb_update_rx_clients(bond);
1578 if (bond_info->rlb_update_retry_counter)
1579 --bond_info->rlb_update_retry_counter;
1581 bond_info->rx_ntt = 0;
1587 queue_delayed_work(bond->wq, &bond->alb_work, alb_delta_in_ticks);
1590 /* assumption: called before the slave is attached to the bond
1591 * and not locked by the bond lock
1593 int bond_alb_init_slave(struct bonding *bond, struct slave *slave)
1597 res = alb_set_slave_mac_addr(slave, slave->perm_hwaddr,
1598 slave->dev->addr_len);
1602 res = alb_handle_addr_collision_on_attach(bond, slave);
1606 tlb_init_slave(slave);
1608 /* order a rebalance ASAP */
1609 bond->alb_info.tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS;
1611 if (bond->alb_info.rlb_enabled)
1612 bond->alb_info.rlb_rebalance = 1;
1617 /* Remove slave from tlb and rlb hash tables, and fix up MAC addresses
1620 * Caller must hold RTNL and no other locks
1622 void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave)
1624 if (bond_has_slaves(bond))
1625 alb_change_hw_addr_on_detach(bond, slave);
1627 tlb_clear_slave(bond, slave, 0);
1629 if (bond->alb_info.rlb_enabled) {
1630 bond->alb_info.rx_slave = NULL;
1631 rlb_clear_slave(bond, slave);
1636 void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link)
1638 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1640 if (link == BOND_LINK_DOWN) {
1641 tlb_clear_slave(bond, slave, 0);
1642 if (bond->alb_info.rlb_enabled)
1643 rlb_clear_slave(bond, slave);
1644 } else if (link == BOND_LINK_UP) {
1645 /* order a rebalance ASAP */
1646 bond_info->tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS;
1647 if (bond->alb_info.rlb_enabled) {
1648 bond->alb_info.rlb_rebalance = 1;
1649 /* If the updelay module parameter is smaller than the
1650 * forwarding delay of the switch the rebalance will
1651 * not work because the rebalance arp replies will
1652 * not be forwarded to the clients..
1657 if (bond_is_nondyn_tlb(bond)) {
1658 if (bond_update_slave_arr(bond, NULL))
1659 pr_err("Failed to build slave-array for TLB mode.\n");
1664 * bond_alb_handle_active_change - assign new curr_active_slave
1665 * @bond: our bonding struct
1666 * @new_slave: new slave to assign
1668 * Set the bond->curr_active_slave to @new_slave and handle
1669 * mac address swapping and promiscuity changes as needed.
1671 * Caller must hold RTNL
1673 void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave)
1675 struct slave *swap_slave;
1676 struct slave *curr_active;
1678 curr_active = rtnl_dereference(bond->curr_active_slave);
1679 if (curr_active == new_slave)
1682 if (curr_active && bond->alb_info.primary_is_promisc) {
1683 dev_set_promiscuity(curr_active->dev, -1);
1684 bond->alb_info.primary_is_promisc = 0;
1685 bond->alb_info.rlb_promisc_timeout_counter = 0;
1688 swap_slave = curr_active;
1689 rcu_assign_pointer(bond->curr_active_slave, new_slave);
1691 if (!new_slave || !bond_has_slaves(bond))
1694 /* set the new curr_active_slave to the bonds mac address
1695 * i.e. swap mac addresses of old curr_active_slave and new curr_active_slave
1698 swap_slave = bond_slave_has_mac(bond, bond->dev->dev_addr);
1700 /* Arrange for swap_slave and new_slave to temporarily be
1701 * ignored so we can mess with their MAC addresses without
1702 * fear of interference from transmit activity.
1705 tlb_clear_slave(bond, swap_slave, 1);
1706 tlb_clear_slave(bond, new_slave, 1);
1708 /* in TLB mode, the slave might flip down/up with the old dev_addr,
1709 * and thus filter bond->dev_addr's packets, so force bond's mac
1711 if (BOND_MODE(bond) == BOND_MODE_TLB) {
1712 struct sockaddr_storage ss;
1713 u8 tmp_addr[MAX_ADDR_LEN];
1715 bond_hw_addr_copy(tmp_addr, new_slave->dev->dev_addr,
1716 new_slave->dev->addr_len);
1718 bond_hw_addr_copy(ss.__data, bond->dev->dev_addr,
1719 bond->dev->addr_len);
1720 ss.ss_family = bond->dev->type;
1721 /* we don't care if it can't change its mac, best effort */
1722 dev_set_mac_address(new_slave->dev, (struct sockaddr *)&ss);
1724 bond_hw_addr_copy(new_slave->dev->dev_addr, tmp_addr,
1725 new_slave->dev->addr_len);
1728 /* curr_active_slave must be set before calling alb_swap_mac_addr */
1730 /* swap mac address */
1731 alb_swap_mac_addr(swap_slave, new_slave);
1732 alb_fasten_mac_swap(bond, swap_slave, new_slave);
1734 /* set the new_slave to the bond mac address */
1735 alb_set_slave_mac_addr(new_slave, bond->dev->dev_addr,
1736 bond->dev->addr_len);
1737 alb_send_learning_packets(new_slave, bond->dev->dev_addr,
1742 /* Called with RTNL */
1743 int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr)
1745 struct bonding *bond = netdev_priv(bond_dev);
1746 struct sockaddr_storage *ss = addr;
1747 struct slave *curr_active;
1748 struct slave *swap_slave;
1751 if (!is_valid_ether_addr(ss->__data))
1752 return -EADDRNOTAVAIL;
1754 res = alb_set_mac_address(bond, addr);
1758 bond_hw_addr_copy(bond_dev->dev_addr, ss->__data, bond_dev->addr_len);
1760 /* If there is no curr_active_slave there is nothing else to do.
1761 * Otherwise we'll need to pass the new address to it and handle
1764 curr_active = rtnl_dereference(bond->curr_active_slave);
1768 swap_slave = bond_slave_has_mac(bond, bond_dev->dev_addr);
1771 alb_swap_mac_addr(swap_slave, curr_active);
1772 alb_fasten_mac_swap(bond, swap_slave, curr_active);
1774 alb_set_slave_mac_addr(curr_active, bond_dev->dev_addr,
1775 bond_dev->addr_len);
1777 alb_send_learning_packets(curr_active,
1778 bond_dev->dev_addr, false);
1779 if (bond->alb_info.rlb_enabled) {
1780 /* inform clients mac address has changed */
1781 rlb_req_update_slave_clients(bond, curr_active);
1788 void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
1790 if (bond->alb_info.rlb_enabled)
1791 rlb_clear_vlan(bond, vlan_id);