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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved.
4 */
5
6#include <linux/skbuff.h>
7#include <linux/netdevice.h>
8#include <linux/etherdevice.h>
9#include <linux/pkt_sched.h>
10#include <linux/spinlock.h>
11#include <linux/slab.h>
12#include <linux/timer.h>
13#include <linux/ip.h>
14#include <linux/ipv6.h>
15#include <linux/if_arp.h>
16#include <linux/if_ether.h>
17#include <linux/if_bonding.h>
18#include <linux/if_vlan.h>
19#include <linux/in.h>
20#include <net/ipx.h>
21#include <net/arp.h>
22#include <net/ipv6.h>
23#include <asm/byteorder.h>
24#include <net/bonding.h>
25#include <net/bond_alb.h>
26
27static const u8 mac_v6_allmcast[ETH_ALEN + 2] __long_aligned = {
28 0x33, 0x33, 0x00, 0x00, 0x00, 0x01
29};
30static const int alb_delta_in_ticks = HZ / ALB_TIMER_TICKS_PER_SEC;
31
32#pragma pack(1)
33struct learning_pkt {
34 u8 mac_dst[ETH_ALEN];
35 u8 mac_src[ETH_ALEN];
36 __be16 type;
37 u8 padding[ETH_ZLEN - ETH_HLEN];
38};
39
40struct arp_pkt {
41 __be16 hw_addr_space;
42 __be16 prot_addr_space;
43 u8 hw_addr_len;
44 u8 prot_addr_len;
45 __be16 op_code;
46 u8 mac_src[ETH_ALEN]; /* sender hardware address */
47 __be32 ip_src; /* sender IP address */
48 u8 mac_dst[ETH_ALEN]; /* target hardware address */
49 __be32 ip_dst; /* target IP address */
50};
51#pragma pack()
52
53static inline struct arp_pkt *arp_pkt(const struct sk_buff *skb)
54{
55 return (struct arp_pkt *)skb_network_header(skb);
56}
57
58/* Forward declaration */
59static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[],
60 bool strict_match);
61static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp);
62static void rlb_src_unlink(struct bonding *bond, u32 index);
63static void rlb_src_link(struct bonding *bond, u32 ip_src_hash,
64 u32 ip_dst_hash);
65
66static inline u8 _simple_hash(const u8 *hash_start, int hash_size)
67{
68 int i;
69 u8 hash = 0;
70
71 for (i = 0; i < hash_size; i++)
72 hash ^= hash_start[i];
73
74 return hash;
75}
76
77/*********************** tlb specific functions ***************************/
78
79static inline void tlb_init_table_entry(struct tlb_client_info *entry, int save_load)
80{
81 if (save_load) {
82 entry->load_history = 1 + entry->tx_bytes /
83 BOND_TLB_REBALANCE_INTERVAL;
84 entry->tx_bytes = 0;
85 }
86
87 entry->tx_slave = NULL;
88 entry->next = TLB_NULL_INDEX;
89 entry->prev = TLB_NULL_INDEX;
90}
91
92static inline void tlb_init_slave(struct slave *slave)
93{
94 SLAVE_TLB_INFO(slave).load = 0;
95 SLAVE_TLB_INFO(slave).head = TLB_NULL_INDEX;
96}
97
98static void __tlb_clear_slave(struct bonding *bond, struct slave *slave,
99 int save_load)
100{
101 struct tlb_client_info *tx_hash_table;
102 u32 index;
103
104 /* clear slave from tx_hashtbl */
105 tx_hash_table = BOND_ALB_INFO(bond).tx_hashtbl;
106
107 /* skip this if we've already freed the tx hash table */
108 if (tx_hash_table) {
109 index = SLAVE_TLB_INFO(slave).head;
110 while (index != TLB_NULL_INDEX) {
111 u32 next_index = tx_hash_table[index].next;
112 tlb_init_table_entry(&tx_hash_table[index], save_load);
113 index = next_index;
114 }
115 }
116
117 tlb_init_slave(slave);
118}
119
120static void tlb_clear_slave(struct bonding *bond, struct slave *slave,
121 int save_load)
122{
123 spin_lock_bh(&bond->mode_lock);
124 __tlb_clear_slave(bond, slave, save_load);
125 spin_unlock_bh(&bond->mode_lock);
126}
127
128/* Must be called before starting the monitor timer */
129static int tlb_initialize(struct bonding *bond)
130{
131 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
132 int size = TLB_HASH_TABLE_SIZE * sizeof(struct tlb_client_info);
133 struct tlb_client_info *new_hashtbl;
134 int i;
135
136 new_hashtbl = kzalloc(size, GFP_KERNEL);
137 if (!new_hashtbl)
138 return -ENOMEM;
139
140 spin_lock_bh(&bond->mode_lock);
141
142 bond_info->tx_hashtbl = new_hashtbl;
143
144 for (i = 0; i < TLB_HASH_TABLE_SIZE; i++)
145 tlb_init_table_entry(&bond_info->tx_hashtbl[i], 0);
146
147 spin_unlock_bh(&bond->mode_lock);
148
149 return 0;
150}
151
152/* Must be called only after all slaves have been released */
153static void tlb_deinitialize(struct bonding *bond)
154{
155 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
156
157 spin_lock_bh(&bond->mode_lock);
158
159 kfree(bond_info->tx_hashtbl);
160 bond_info->tx_hashtbl = NULL;
161
162 spin_unlock_bh(&bond->mode_lock);
163}
164
165static long long compute_gap(struct slave *slave)
166{
167 return (s64) (slave->speed << 20) - /* Convert to Megabit per sec */
168 (s64) (SLAVE_TLB_INFO(slave).load << 3); /* Bytes to bits */
169}
170
171static struct slave *tlb_get_least_loaded_slave(struct bonding *bond)
172{
173 struct slave *slave, *least_loaded;
174 struct list_head *iter;
175 long long max_gap;
176
177 least_loaded = NULL;
178 max_gap = LLONG_MIN;
179
180 /* Find the slave with the largest gap */
181 bond_for_each_slave_rcu(bond, slave, iter) {
182 if (bond_slave_can_tx(slave)) {
183 long long gap = compute_gap(slave);
184
185 if (max_gap < gap) {
186 least_loaded = slave;
187 max_gap = gap;
188 }
189 }
190 }
191
192 return least_loaded;
193}
194
195static struct slave *__tlb_choose_channel(struct bonding *bond, u32 hash_index,
196 u32 skb_len)
197{
198 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
199 struct tlb_client_info *hash_table;
200 struct slave *assigned_slave;
201
202 hash_table = bond_info->tx_hashtbl;
203 assigned_slave = hash_table[hash_index].tx_slave;
204 if (!assigned_slave) {
205 assigned_slave = tlb_get_least_loaded_slave(bond);
206
207 if (assigned_slave) {
208 struct tlb_slave_info *slave_info =
209 &(SLAVE_TLB_INFO(assigned_slave));
210 u32 next_index = slave_info->head;
211
212 hash_table[hash_index].tx_slave = assigned_slave;
213 hash_table[hash_index].next = next_index;
214 hash_table[hash_index].prev = TLB_NULL_INDEX;
215
216 if (next_index != TLB_NULL_INDEX)
217 hash_table[next_index].prev = hash_index;
218
219 slave_info->head = hash_index;
220 slave_info->load +=
221 hash_table[hash_index].load_history;
222 }
223 }
224
225 if (assigned_slave)
226 hash_table[hash_index].tx_bytes += skb_len;
227
228 return assigned_slave;
229}
230
231static struct slave *tlb_choose_channel(struct bonding *bond, u32 hash_index,
232 u32 skb_len)
233{
234 struct slave *tx_slave;
235
236 /* We don't need to disable softirq here, becase
237 * tlb_choose_channel() is only called by bond_alb_xmit()
238 * which already has softirq disabled.
239 */
240 spin_lock(&bond->mode_lock);
241 tx_slave = __tlb_choose_channel(bond, hash_index, skb_len);
242 spin_unlock(&bond->mode_lock);
243
244 return tx_slave;
245}
246
247/*********************** rlb specific functions ***************************/
248
249/* when an ARP REPLY is received from a client update its info
250 * in the rx_hashtbl
251 */
252static void rlb_update_entry_from_arp(struct bonding *bond, struct arp_pkt *arp)
253{
254 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
255 struct rlb_client_info *client_info;
256 u32 hash_index;
257
258 spin_lock_bh(&bond->mode_lock);
259
260 hash_index = _simple_hash((u8 *)&(arp->ip_src), sizeof(arp->ip_src));
261 client_info = &(bond_info->rx_hashtbl[hash_index]);
262
263 if ((client_info->assigned) &&
264 (client_info->ip_src == arp->ip_dst) &&
265 (client_info->ip_dst == arp->ip_src) &&
266 (!ether_addr_equal_64bits(client_info->mac_dst, arp->mac_src))) {
267 /* update the clients MAC address */
268 ether_addr_copy(client_info->mac_dst, arp->mac_src);
269 client_info->ntt = 1;
270 bond_info->rx_ntt = 1;
271 }
272
273 spin_unlock_bh(&bond->mode_lock);
274}
275
276static int rlb_arp_recv(const struct sk_buff *skb, struct bonding *bond,
277 struct slave *slave)
278{
279 struct arp_pkt *arp, _arp;
280
281 if (skb->protocol != cpu_to_be16(ETH_P_ARP))
282 goto out;
283
284 arp = skb_header_pointer(skb, 0, sizeof(_arp), &_arp);
285 if (!arp)
286 goto out;
287
288 /* We received an ARP from arp->ip_src.
289 * We might have used this IP address previously (on the bonding host
290 * itself or on a system that is bridged together with the bond).
291 * However, if arp->mac_src is different than what is stored in
292 * rx_hashtbl, some other host is now using the IP and we must prevent
293 * sending out client updates with this IP address and the old MAC
294 * address.
295 * Clean up all hash table entries that have this address as ip_src but
296 * have a different mac_src.
297 */
298 rlb_purge_src_ip(bond, arp);
299
300 if (arp->op_code == htons(ARPOP_REPLY)) {
301 /* update rx hash table for this ARP */
302 rlb_update_entry_from_arp(bond, arp);
303 slave_dbg(bond->dev, slave->dev, "Server received an ARP Reply from client\n");
304 }
305out:
306 return RX_HANDLER_ANOTHER;
307}
308
309/* Caller must hold rcu_read_lock() */
310static struct slave *__rlb_next_rx_slave(struct bonding *bond)
311{
312 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
313 struct slave *before = NULL, *rx_slave = NULL, *slave;
314 struct list_head *iter;
315 bool found = false;
316
317 bond_for_each_slave_rcu(bond, slave, iter) {
318 if (!bond_slave_can_tx(slave))
319 continue;
320 if (!found) {
321 if (!before || before->speed < slave->speed)
322 before = slave;
323 } else {
324 if (!rx_slave || rx_slave->speed < slave->speed)
325 rx_slave = slave;
326 }
327 if (slave == bond_info->rx_slave)
328 found = true;
329 }
330 /* we didn't find anything after the current or we have something
331 * better before and up to the current slave
332 */
333 if (!rx_slave || (before && rx_slave->speed < before->speed))
334 rx_slave = before;
335
336 if (rx_slave)
337 bond_info->rx_slave = rx_slave;
338
339 return rx_slave;
340}
341
342/* Caller must hold RTNL, rcu_read_lock is obtained only to silence checkers */
343static struct slave *rlb_next_rx_slave(struct bonding *bond)
344{
345 struct slave *rx_slave;
346
347 ASSERT_RTNL();
348
349 rcu_read_lock();
350 rx_slave = __rlb_next_rx_slave(bond);
351 rcu_read_unlock();
352
353 return rx_slave;
354}
355
356/* teach the switch the mac of a disabled slave
357 * on the primary for fault tolerance
358 *
359 * Caller must hold RTNL
360 */
361static void rlb_teach_disabled_mac_on_primary(struct bonding *bond, u8 addr[])
362{
363 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
364
365 if (!curr_active)
366 return;
367
368 if (!bond->alb_info.primary_is_promisc) {
369 if (!dev_set_promiscuity(curr_active->dev, 1))
370 bond->alb_info.primary_is_promisc = 1;
371 else
372 bond->alb_info.primary_is_promisc = 0;
373 }
374
375 bond->alb_info.rlb_promisc_timeout_counter = 0;
376
377 alb_send_learning_packets(curr_active, addr, true);
378}
379
380/* slave being removed should not be active at this point
381 *
382 * Caller must hold rtnl.
383 */
384static void rlb_clear_slave(struct bonding *bond, struct slave *slave)
385{
386 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
387 struct rlb_client_info *rx_hash_table;
388 u32 index, next_index;
389
390 /* clear slave from rx_hashtbl */
391 spin_lock_bh(&bond->mode_lock);
392
393 rx_hash_table = bond_info->rx_hashtbl;
394 index = bond_info->rx_hashtbl_used_head;
395 for (; index != RLB_NULL_INDEX; index = next_index) {
396 next_index = rx_hash_table[index].used_next;
397 if (rx_hash_table[index].slave == slave) {
398 struct slave *assigned_slave = rlb_next_rx_slave(bond);
399
400 if (assigned_slave) {
401 rx_hash_table[index].slave = assigned_slave;
402 if (is_valid_ether_addr(rx_hash_table[index].mac_dst)) {
403 bond_info->rx_hashtbl[index].ntt = 1;
404 bond_info->rx_ntt = 1;
405 /* A slave has been removed from the
406 * table because it is either disabled
407 * or being released. We must retry the
408 * update to avoid clients from not
409 * being updated & disconnecting when
410 * there is stress
411 */
412 bond_info->rlb_update_retry_counter =
413 RLB_UPDATE_RETRY;
414 }
415 } else { /* there is no active slave */
416 rx_hash_table[index].slave = NULL;
417 }
418 }
419 }
420
421 spin_unlock_bh(&bond->mode_lock);
422
423 if (slave != rtnl_dereference(bond->curr_active_slave))
424 rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr);
425}
426
427static void rlb_update_client(struct rlb_client_info *client_info)
428{
429 int i;
430
431 if (!client_info->slave || !is_valid_ether_addr(client_info->mac_dst))
432 return;
433
434 for (i = 0; i < RLB_ARP_BURST_SIZE; i++) {
435 struct sk_buff *skb;
436
437 skb = arp_create(ARPOP_REPLY, ETH_P_ARP,
438 client_info->ip_dst,
439 client_info->slave->dev,
440 client_info->ip_src,
441 client_info->mac_dst,
442 client_info->slave->dev->dev_addr,
443 client_info->mac_dst);
444 if (!skb) {
445 slave_err(client_info->slave->bond->dev,
446 client_info->slave->dev,
447 "failed to create an ARP packet\n");
448 continue;
449 }
450
451 skb->dev = client_info->slave->dev;
452
453 if (client_info->vlan_id) {
454 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
455 client_info->vlan_id);
456 }
457
458 arp_xmit(skb);
459 }
460}
461
462/* sends ARP REPLIES that update the clients that need updating */
463static void rlb_update_rx_clients(struct bonding *bond)
464{
465 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
466 struct rlb_client_info *client_info;
467 u32 hash_index;
468
469 spin_lock_bh(&bond->mode_lock);
470
471 hash_index = bond_info->rx_hashtbl_used_head;
472 for (; hash_index != RLB_NULL_INDEX;
473 hash_index = client_info->used_next) {
474 client_info = &(bond_info->rx_hashtbl[hash_index]);
475 if (client_info->ntt) {
476 rlb_update_client(client_info);
477 if (bond_info->rlb_update_retry_counter == 0)
478 client_info->ntt = 0;
479 }
480 }
481
482 /* do not update the entries again until this counter is zero so that
483 * not to confuse the clients.
484 */
485 bond_info->rlb_update_delay_counter = RLB_UPDATE_DELAY;
486
487 spin_unlock_bh(&bond->mode_lock);
488}
489
490/* The slave was assigned a new mac address - update the clients */
491static void rlb_req_update_slave_clients(struct bonding *bond, struct slave *slave)
492{
493 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
494 struct rlb_client_info *client_info;
495 int ntt = 0;
496 u32 hash_index;
497
498 spin_lock_bh(&bond->mode_lock);
499
500 hash_index = bond_info->rx_hashtbl_used_head;
501 for (; hash_index != RLB_NULL_INDEX;
502 hash_index = client_info->used_next) {
503 client_info = &(bond_info->rx_hashtbl[hash_index]);
504
505 if ((client_info->slave == slave) &&
506 is_valid_ether_addr(client_info->mac_dst)) {
507 client_info->ntt = 1;
508 ntt = 1;
509 }
510 }
511
512 /* update the team's flag only after the whole iteration */
513 if (ntt) {
514 bond_info->rx_ntt = 1;
515 /* fasten the change */
516 bond_info->rlb_update_retry_counter = RLB_UPDATE_RETRY;
517 }
518
519 spin_unlock_bh(&bond->mode_lock);
520}
521
522/* mark all clients using src_ip to be updated */
523static void rlb_req_update_subnet_clients(struct bonding *bond, __be32 src_ip)
524{
525 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
526 struct rlb_client_info *client_info;
527 u32 hash_index;
528
529 spin_lock(&bond->mode_lock);
530
531 hash_index = bond_info->rx_hashtbl_used_head;
532 for (; hash_index != RLB_NULL_INDEX;
533 hash_index = client_info->used_next) {
534 client_info = &(bond_info->rx_hashtbl[hash_index]);
535
536 if (!client_info->slave) {
537 netdev_err(bond->dev, "found a client with no channel in the client's hash table\n");
538 continue;
539 }
540 /* update all clients using this src_ip, that are not assigned
541 * to the team's address (curr_active_slave) and have a known
542 * unicast mac address.
543 */
544 if ((client_info->ip_src == src_ip) &&
545 !ether_addr_equal_64bits(client_info->slave->dev->dev_addr,
546 bond->dev->dev_addr) &&
547 is_valid_ether_addr(client_info->mac_dst)) {
548 client_info->ntt = 1;
549 bond_info->rx_ntt = 1;
550 }
551 }
552
553 spin_unlock(&bond->mode_lock);
554}
555
556static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bond)
557{
558 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
559 struct arp_pkt *arp = arp_pkt(skb);
560 struct slave *assigned_slave, *curr_active_slave;
561 struct rlb_client_info *client_info;
562 u32 hash_index = 0;
563
564 spin_lock(&bond->mode_lock);
565
566 curr_active_slave = rcu_dereference(bond->curr_active_slave);
567
568 hash_index = _simple_hash((u8 *)&arp->ip_dst, sizeof(arp->ip_dst));
569 client_info = &(bond_info->rx_hashtbl[hash_index]);
570
571 if (client_info->assigned) {
572 if ((client_info->ip_src == arp->ip_src) &&
573 (client_info->ip_dst == arp->ip_dst)) {
574 /* the entry is already assigned to this client */
575 if (!is_broadcast_ether_addr(arp->mac_dst)) {
576 /* update mac address from arp */
577 ether_addr_copy(client_info->mac_dst, arp->mac_dst);
578 }
579 ether_addr_copy(client_info->mac_src, arp->mac_src);
580
581 assigned_slave = client_info->slave;
582 if (assigned_slave) {
583 spin_unlock(&bond->mode_lock);
584 return assigned_slave;
585 }
586 } else {
587 /* the entry is already assigned to some other client,
588 * move the old client to primary (curr_active_slave) so
589 * that the new client can be assigned to this entry.
590 */
591 if (curr_active_slave &&
592 client_info->slave != curr_active_slave) {
593 client_info->slave = curr_active_slave;
594 rlb_update_client(client_info);
595 }
596 }
597 }
598 /* assign a new slave */
599 assigned_slave = __rlb_next_rx_slave(bond);
600
601 if (assigned_slave) {
602 if (!(client_info->assigned &&
603 client_info->ip_src == arp->ip_src)) {
604 /* ip_src is going to be updated,
605 * fix the src hash list
606 */
607 u32 hash_src = _simple_hash((u8 *)&arp->ip_src,
608 sizeof(arp->ip_src));
609 rlb_src_unlink(bond, hash_index);
610 rlb_src_link(bond, hash_src, hash_index);
611 }
612
613 client_info->ip_src = arp->ip_src;
614 client_info->ip_dst = arp->ip_dst;
615 /* arp->mac_dst is broadcast for arp reqeusts.
616 * will be updated with clients actual unicast mac address
617 * upon receiving an arp reply.
618 */
619 ether_addr_copy(client_info->mac_dst, arp->mac_dst);
620 ether_addr_copy(client_info->mac_src, arp->mac_src);
621 client_info->slave = assigned_slave;
622
623 if (is_valid_ether_addr(client_info->mac_dst)) {
624 client_info->ntt = 1;
625 bond->alb_info.rx_ntt = 1;
626 } else {
627 client_info->ntt = 0;
628 }
629
630 if (vlan_get_tag(skb, &client_info->vlan_id))
631 client_info->vlan_id = 0;
632
633 if (!client_info->assigned) {
634 u32 prev_tbl_head = bond_info->rx_hashtbl_used_head;
635 bond_info->rx_hashtbl_used_head = hash_index;
636 client_info->used_next = prev_tbl_head;
637 if (prev_tbl_head != RLB_NULL_INDEX) {
638 bond_info->rx_hashtbl[prev_tbl_head].used_prev =
639 hash_index;
640 }
641 client_info->assigned = 1;
642 }
643 }
644
645 spin_unlock(&bond->mode_lock);
646
647 return assigned_slave;
648}
649
650/* chooses (and returns) transmit channel for arp reply
651 * does not choose channel for other arp types since they are
652 * sent on the curr_active_slave
653 */
654static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond)
655{
656 struct arp_pkt *arp = arp_pkt(skb);
657 struct slave *tx_slave = NULL;
658
659 /* Don't modify or load balance ARPs that do not originate locally
660 * (e.g.,arrive via a bridge).
661 */
662 if (!bond_slave_has_mac_rx(bond, arp->mac_src))
663 return NULL;
664
665 if (arp->op_code == htons(ARPOP_REPLY)) {
666 /* the arp must be sent on the selected rx channel */
667 tx_slave = rlb_choose_channel(skb, bond);
668 if (tx_slave)
669 bond_hw_addr_copy(arp->mac_src, tx_slave->dev->dev_addr,
670 tx_slave->dev->addr_len);
671 netdev_dbg(bond->dev, "(slave %s): Server sent ARP Reply packet\n",
672 tx_slave ? tx_slave->dev->name : "NULL");
673 } else if (arp->op_code == htons(ARPOP_REQUEST)) {
674 /* Create an entry in the rx_hashtbl for this client as a
675 * place holder.
676 * When the arp reply is received the entry will be updated
677 * with the correct unicast address of the client.
678 */
679 tx_slave = rlb_choose_channel(skb, bond);
680
681 /* The ARP reply packets must be delayed so that
682 * they can cancel out the influence of the ARP request.
683 */
684 bond->alb_info.rlb_update_delay_counter = RLB_UPDATE_DELAY;
685
686 /* arp requests are broadcast and are sent on the primary
687 * the arp request will collapse all clients on the subnet to
688 * the primary slave. We must register these clients to be
689 * updated with their assigned mac.
690 */
691 rlb_req_update_subnet_clients(bond, arp->ip_src);
692 netdev_dbg(bond->dev, "(slave %s): Server sent ARP Request packet\n",
693 tx_slave ? tx_slave->dev->name : "NULL");
694 }
695
696 return tx_slave;
697}
698
699static void rlb_rebalance(struct bonding *bond)
700{
701 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
702 struct slave *assigned_slave;
703 struct rlb_client_info *client_info;
704 int ntt;
705 u32 hash_index;
706
707 spin_lock_bh(&bond->mode_lock);
708
709 ntt = 0;
710 hash_index = bond_info->rx_hashtbl_used_head;
711 for (; hash_index != RLB_NULL_INDEX;
712 hash_index = client_info->used_next) {
713 client_info = &(bond_info->rx_hashtbl[hash_index]);
714 assigned_slave = __rlb_next_rx_slave(bond);
715 if (assigned_slave && (client_info->slave != assigned_slave)) {
716 client_info->slave = assigned_slave;
717 if (!is_zero_ether_addr(client_info->mac_dst)) {
718 client_info->ntt = 1;
719 ntt = 1;
720 }
721 }
722 }
723
724 /* update the team's flag only after the whole iteration */
725 if (ntt)
726 bond_info->rx_ntt = 1;
727 spin_unlock_bh(&bond->mode_lock);
728}
729
730/* Caller must hold mode_lock */
731static void rlb_init_table_entry_dst(struct rlb_client_info *entry)
732{
733 entry->used_next = RLB_NULL_INDEX;
734 entry->used_prev = RLB_NULL_INDEX;
735 entry->assigned = 0;
736 entry->slave = NULL;
737 entry->vlan_id = 0;
738}
739static void rlb_init_table_entry_src(struct rlb_client_info *entry)
740{
741 entry->src_first = RLB_NULL_INDEX;
742 entry->src_prev = RLB_NULL_INDEX;
743 entry->src_next = RLB_NULL_INDEX;
744}
745
746static void rlb_init_table_entry(struct rlb_client_info *entry)
747{
748 memset(entry, 0, sizeof(struct rlb_client_info));
749 rlb_init_table_entry_dst(entry);
750 rlb_init_table_entry_src(entry);
751}
752
753static void rlb_delete_table_entry_dst(struct bonding *bond, u32 index)
754{
755 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
756 u32 next_index = bond_info->rx_hashtbl[index].used_next;
757 u32 prev_index = bond_info->rx_hashtbl[index].used_prev;
758
759 if (index == bond_info->rx_hashtbl_used_head)
760 bond_info->rx_hashtbl_used_head = next_index;
761 if (prev_index != RLB_NULL_INDEX)
762 bond_info->rx_hashtbl[prev_index].used_next = next_index;
763 if (next_index != RLB_NULL_INDEX)
764 bond_info->rx_hashtbl[next_index].used_prev = prev_index;
765}
766
767/* unlink a rlb hash table entry from the src list */
768static void rlb_src_unlink(struct bonding *bond, u32 index)
769{
770 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
771 u32 next_index = bond_info->rx_hashtbl[index].src_next;
772 u32 prev_index = bond_info->rx_hashtbl[index].src_prev;
773
774 bond_info->rx_hashtbl[index].src_next = RLB_NULL_INDEX;
775 bond_info->rx_hashtbl[index].src_prev = RLB_NULL_INDEX;
776
777 if (next_index != RLB_NULL_INDEX)
778 bond_info->rx_hashtbl[next_index].src_prev = prev_index;
779
780 if (prev_index == RLB_NULL_INDEX)
781 return;
782
783 /* is prev_index pointing to the head of this list? */
784 if (bond_info->rx_hashtbl[prev_index].src_first == index)
785 bond_info->rx_hashtbl[prev_index].src_first = next_index;
786 else
787 bond_info->rx_hashtbl[prev_index].src_next = next_index;
788
789}
790
791static void rlb_delete_table_entry(struct bonding *bond, u32 index)
792{
793 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
794 struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]);
795
796 rlb_delete_table_entry_dst(bond, index);
797 rlb_init_table_entry_dst(entry);
798
799 rlb_src_unlink(bond, index);
800}
801
802/* add the rx_hashtbl[ip_dst_hash] entry to the list
803 * of entries with identical ip_src_hash
804 */
805static void rlb_src_link(struct bonding *bond, u32 ip_src_hash, u32 ip_dst_hash)
806{
807 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
808 u32 next;
809
810 bond_info->rx_hashtbl[ip_dst_hash].src_prev = ip_src_hash;
811 next = bond_info->rx_hashtbl[ip_src_hash].src_first;
812 bond_info->rx_hashtbl[ip_dst_hash].src_next = next;
813 if (next != RLB_NULL_INDEX)
814 bond_info->rx_hashtbl[next].src_prev = ip_dst_hash;
815 bond_info->rx_hashtbl[ip_src_hash].src_first = ip_dst_hash;
816}
817
818/* deletes all rx_hashtbl entries with arp->ip_src if their mac_src does
819 * not match arp->mac_src
820 */
821static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp)
822{
823 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
824 u32 ip_src_hash = _simple_hash((u8 *)&(arp->ip_src), sizeof(arp->ip_src));
825 u32 index;
826
827 spin_lock_bh(&bond->mode_lock);
828
829 index = bond_info->rx_hashtbl[ip_src_hash].src_first;
830 while (index != RLB_NULL_INDEX) {
831 struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]);
832 u32 next_index = entry->src_next;
833 if (entry->ip_src == arp->ip_src &&
834 !ether_addr_equal_64bits(arp->mac_src, entry->mac_src))
835 rlb_delete_table_entry(bond, index);
836 index = next_index;
837 }
838 spin_unlock_bh(&bond->mode_lock);
839}
840
841static int rlb_initialize(struct bonding *bond)
842{
843 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
844 struct rlb_client_info *new_hashtbl;
845 int size = RLB_HASH_TABLE_SIZE * sizeof(struct rlb_client_info);
846 int i;
847
848 new_hashtbl = kmalloc(size, GFP_KERNEL);
849 if (!new_hashtbl)
850 return -1;
851
852 spin_lock_bh(&bond->mode_lock);
853
854 bond_info->rx_hashtbl = new_hashtbl;
855
856 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
857
858 for (i = 0; i < RLB_HASH_TABLE_SIZE; i++)
859 rlb_init_table_entry(bond_info->rx_hashtbl + i);
860
861 spin_unlock_bh(&bond->mode_lock);
862
863 /* register to receive ARPs */
864 bond->recv_probe = rlb_arp_recv;
865
866 return 0;
867}
868
869static void rlb_deinitialize(struct bonding *bond)
870{
871 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
872
873 spin_lock_bh(&bond->mode_lock);
874
875 kfree(bond_info->rx_hashtbl);
876 bond_info->rx_hashtbl = NULL;
877 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
878
879 spin_unlock_bh(&bond->mode_lock);
880}
881
882static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
883{
884 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
885 u32 curr_index;
886
887 spin_lock_bh(&bond->mode_lock);
888
889 curr_index = bond_info->rx_hashtbl_used_head;
890 while (curr_index != RLB_NULL_INDEX) {
891 struct rlb_client_info *curr = &(bond_info->rx_hashtbl[curr_index]);
892 u32 next_index = bond_info->rx_hashtbl[curr_index].used_next;
893
894 if (curr->vlan_id == vlan_id)
895 rlb_delete_table_entry(bond, curr_index);
896
897 curr_index = next_index;
898 }
899
900 spin_unlock_bh(&bond->mode_lock);
901}
902
903/*********************** tlb/rlb shared functions *********************/
904
905static void alb_send_lp_vid(struct slave *slave, u8 mac_addr[],
906 __be16 vlan_proto, u16 vid)
907{
908 struct learning_pkt pkt;
909 struct sk_buff *skb;
910 int size = sizeof(struct learning_pkt);
911
912 memset(&pkt, 0, size);
913 ether_addr_copy(pkt.mac_dst, mac_addr);
914 ether_addr_copy(pkt.mac_src, mac_addr);
915 pkt.type = cpu_to_be16(ETH_P_LOOPBACK);
916
917 skb = dev_alloc_skb(size);
918 if (!skb)
919 return;
920
921 skb_put_data(skb, &pkt, size);
922
923 skb_reset_mac_header(skb);
924 skb->network_header = skb->mac_header + ETH_HLEN;
925 skb->protocol = pkt.type;
926 skb->priority = TC_PRIO_CONTROL;
927 skb->dev = slave->dev;
928
929 slave_dbg(slave->bond->dev, slave->dev,
930 "Send learning packet: mac %pM vlan %d\n", mac_addr, vid);
931
932 if (vid)
933 __vlan_hwaccel_put_tag(skb, vlan_proto, vid);
934
935 dev_queue_xmit(skb);
936}
937
938struct alb_walk_data {
939 struct bonding *bond;
940 struct slave *slave;
941 u8 *mac_addr;
942 bool strict_match;
943};
944
945static int alb_upper_dev_walk(struct net_device *upper, void *_data)
946{
947 struct alb_walk_data *data = _data;
948 bool strict_match = data->strict_match;
949 struct bonding *bond = data->bond;
950 struct slave *slave = data->slave;
951 u8 *mac_addr = data->mac_addr;
952 struct bond_vlan_tag *tags;
953
954 if (is_vlan_dev(upper) &&
955 bond->dev->lower_level == upper->lower_level - 1) {
956 if (upper->addr_assign_type == NET_ADDR_STOLEN) {
957 alb_send_lp_vid(slave, mac_addr,
958 vlan_dev_vlan_proto(upper),
959 vlan_dev_vlan_id(upper));
960 } else {
961 alb_send_lp_vid(slave, upper->dev_addr,
962 vlan_dev_vlan_proto(upper),
963 vlan_dev_vlan_id(upper));
964 }
965 }
966
967 /* If this is a macvlan device, then only send updates
968 * when strict_match is turned off.
969 */
970 if (netif_is_macvlan(upper) && !strict_match) {
971 tags = bond_verify_device_path(bond->dev, upper, 0);
972 if (IS_ERR_OR_NULL(tags))
973 BUG();
974 alb_send_lp_vid(slave, upper->dev_addr,
975 tags[0].vlan_proto, tags[0].vlan_id);
976 kfree(tags);
977 }
978
979 return 0;
980}
981
982static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[],
983 bool strict_match)
984{
985 struct bonding *bond = bond_get_bond_by_slave(slave);
986 struct alb_walk_data data = {
987 .strict_match = strict_match,
988 .mac_addr = mac_addr,
989 .slave = slave,
990 .bond = bond,
991 };
992
993 /* send untagged */
994 alb_send_lp_vid(slave, mac_addr, 0, 0);
995
996 /* loop through all devices and see if we need to send a packet
997 * for that device.
998 */
999 rcu_read_lock();
1000 netdev_walk_all_upper_dev_rcu(bond->dev, alb_upper_dev_walk, &data);
1001 rcu_read_unlock();
1002}
1003
1004static int alb_set_slave_mac_addr(struct slave *slave, u8 addr[],
1005 unsigned int len)
1006{
1007 struct net_device *dev = slave->dev;
1008 struct sockaddr_storage ss;
1009
1010 if (BOND_MODE(slave->bond) == BOND_MODE_TLB) {
1011 memcpy(dev->dev_addr, addr, len);
1012 return 0;
1013 }
1014
1015 /* for rlb each slave must have a unique hw mac addresses so that
1016 * each slave will receive packets destined to a different mac
1017 */
1018 memcpy(ss.__data, addr, len);
1019 ss.ss_family = dev->type;
1020 if (dev_set_mac_address(dev, (struct sockaddr *)&ss, NULL)) {
1021 slave_err(slave->bond->dev, dev, "dev_set_mac_address on slave failed! ALB mode requires that the base driver support setting the hw address also when the network device's interface is open\n");
1022 return -EOPNOTSUPP;
1023 }
1024 return 0;
1025}
1026
1027/* Swap MAC addresses between two slaves.
1028 *
1029 * Called with RTNL held, and no other locks.
1030 */
1031static void alb_swap_mac_addr(struct slave *slave1, struct slave *slave2)
1032{
1033 u8 tmp_mac_addr[MAX_ADDR_LEN];
1034
1035 bond_hw_addr_copy(tmp_mac_addr, slave1->dev->dev_addr,
1036 slave1->dev->addr_len);
1037 alb_set_slave_mac_addr(slave1, slave2->dev->dev_addr,
1038 slave2->dev->addr_len);
1039 alb_set_slave_mac_addr(slave2, tmp_mac_addr,
1040 slave1->dev->addr_len);
1041
1042}
1043
1044/* Send learning packets after MAC address swap.
1045 *
1046 * Called with RTNL and no other locks
1047 */
1048static void alb_fasten_mac_swap(struct bonding *bond, struct slave *slave1,
1049 struct slave *slave2)
1050{
1051 int slaves_state_differ = (bond_slave_can_tx(slave1) != bond_slave_can_tx(slave2));
1052 struct slave *disabled_slave = NULL;
1053
1054 ASSERT_RTNL();
1055
1056 /* fasten the change in the switch */
1057 if (bond_slave_can_tx(slave1)) {
1058 alb_send_learning_packets(slave1, slave1->dev->dev_addr, false);
1059 if (bond->alb_info.rlb_enabled) {
1060 /* inform the clients that the mac address
1061 * has changed
1062 */
1063 rlb_req_update_slave_clients(bond, slave1);
1064 }
1065 } else {
1066 disabled_slave = slave1;
1067 }
1068
1069 if (bond_slave_can_tx(slave2)) {
1070 alb_send_learning_packets(slave2, slave2->dev->dev_addr, false);
1071 if (bond->alb_info.rlb_enabled) {
1072 /* inform the clients that the mac address
1073 * has changed
1074 */
1075 rlb_req_update_slave_clients(bond, slave2);
1076 }
1077 } else {
1078 disabled_slave = slave2;
1079 }
1080
1081 if (bond->alb_info.rlb_enabled && slaves_state_differ) {
1082 /* A disabled slave was assigned an active mac addr */
1083 rlb_teach_disabled_mac_on_primary(bond,
1084 disabled_slave->dev->dev_addr);
1085 }
1086}
1087
1088/**
1089 * alb_change_hw_addr_on_detach
1090 * @bond: bonding we're working on
1091 * @slave: the slave that was just detached
1092 *
1093 * We assume that @slave was already detached from the slave list.
1094 *
1095 * If @slave's permanent hw address is different both from its current
1096 * address and from @bond's address, then somewhere in the bond there's
1097 * a slave that has @slave's permanet address as its current address.
1098 * We'll make sure that that slave no longer uses @slave's permanent address.
1099 *
1100 * Caller must hold RTNL and no other locks
1101 */
1102static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *slave)
1103{
1104 int perm_curr_diff;
1105 int perm_bond_diff;
1106 struct slave *found_slave;
1107
1108 perm_curr_diff = !ether_addr_equal_64bits(slave->perm_hwaddr,
1109 slave->dev->dev_addr);
1110 perm_bond_diff = !ether_addr_equal_64bits(slave->perm_hwaddr,
1111 bond->dev->dev_addr);
1112
1113 if (perm_curr_diff && perm_bond_diff) {
1114 found_slave = bond_slave_has_mac(bond, slave->perm_hwaddr);
1115
1116 if (found_slave) {
1117 alb_swap_mac_addr(slave, found_slave);
1118 alb_fasten_mac_swap(bond, slave, found_slave);
1119 }
1120 }
1121}
1122
1123/**
1124 * alb_handle_addr_collision_on_attach
1125 * @bond: bonding we're working on
1126 * @slave: the slave that was just attached
1127 *
1128 * checks uniqueness of slave's mac address and handles the case the
1129 * new slave uses the bonds mac address.
1130 *
1131 * If the permanent hw address of @slave is @bond's hw address, we need to
1132 * find a different hw address to give @slave, that isn't in use by any other
1133 * slave in the bond. This address must be, of course, one of the permanent
1134 * addresses of the other slaves.
1135 *
1136 * We go over the slave list, and for each slave there we compare its
1137 * permanent hw address with the current address of all the other slaves.
1138 * If no match was found, then we've found a slave with a permanent address
1139 * that isn't used by any other slave in the bond, so we can assign it to
1140 * @slave.
1141 *
1142 * assumption: this function is called before @slave is attached to the
1143 * bond slave list.
1144 */
1145static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slave *slave)
1146{
1147 struct slave *has_bond_addr = rcu_access_pointer(bond->curr_active_slave);
1148 struct slave *tmp_slave1, *free_mac_slave = NULL;
1149 struct list_head *iter;
1150
1151 if (!bond_has_slaves(bond)) {
1152 /* this is the first slave */
1153 return 0;
1154 }
1155
1156 /* if slave's mac address differs from bond's mac address
1157 * check uniqueness of slave's mac address against the other
1158 * slaves in the bond.
1159 */
1160 if (!ether_addr_equal_64bits(slave->perm_hwaddr, bond->dev->dev_addr)) {
1161 if (!bond_slave_has_mac(bond, slave->dev->dev_addr))
1162 return 0;
1163
1164 /* Try setting slave mac to bond address and fall-through
1165 * to code handling that situation below...
1166 */
1167 alb_set_slave_mac_addr(slave, bond->dev->dev_addr,
1168 bond->dev->addr_len);
1169 }
1170
1171 /* The slave's address is equal to the address of the bond.
1172 * Search for a spare address in the bond for this slave.
1173 */
1174 bond_for_each_slave(bond, tmp_slave1, iter) {
1175 if (!bond_slave_has_mac(bond, tmp_slave1->perm_hwaddr)) {
1176 /* no slave has tmp_slave1's perm addr
1177 * as its curr addr
1178 */
1179 free_mac_slave = tmp_slave1;
1180 break;
1181 }
1182
1183 if (!has_bond_addr) {
1184 if (ether_addr_equal_64bits(tmp_slave1->dev->dev_addr,
1185 bond->dev->dev_addr)) {
1186
1187 has_bond_addr = tmp_slave1;
1188 }
1189 }
1190 }
1191
1192 if (free_mac_slave) {
1193 alb_set_slave_mac_addr(slave, free_mac_slave->perm_hwaddr,
1194 free_mac_slave->dev->addr_len);
1195
1196 slave_warn(bond->dev, slave->dev, "the slave hw address is in use by the bond; giving it the hw address of %s\n",
1197 free_mac_slave->dev->name);
1198
1199 } else if (has_bond_addr) {
1200 slave_err(bond->dev, slave->dev, "the slave hw address 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");
1201 return -EFAULT;
1202 }
1203
1204 return 0;
1205}
1206
1207/**
1208 * alb_set_mac_address
1209 * @bond:
1210 * @addr:
1211 *
1212 * In TLB mode all slaves are configured to the bond's hw address, but set
1213 * their dev_addr field to different addresses (based on their permanent hw
1214 * addresses).
1215 *
1216 * For each slave, this function sets the interface to the new address and then
1217 * changes its dev_addr field to its previous value.
1218 *
1219 * Unwinding assumes bond's mac address has not yet changed.
1220 */
1221static int alb_set_mac_address(struct bonding *bond, void *addr)
1222{
1223 struct slave *slave, *rollback_slave;
1224 struct list_head *iter;
1225 struct sockaddr_storage ss;
1226 char tmp_addr[MAX_ADDR_LEN];
1227 int res;
1228
1229 if (bond->alb_info.rlb_enabled)
1230 return 0;
1231
1232 bond_for_each_slave(bond, slave, iter) {
1233 /* save net_device's current hw address */
1234 bond_hw_addr_copy(tmp_addr, slave->dev->dev_addr,
1235 slave->dev->addr_len);
1236
1237 res = dev_set_mac_address(slave->dev, addr, NULL);
1238
1239 /* restore net_device's hw address */
1240 bond_hw_addr_copy(slave->dev->dev_addr, tmp_addr,
1241 slave->dev->addr_len);
1242
1243 if (res)
1244 goto unwind;
1245 }
1246
1247 return 0;
1248
1249unwind:
1250 memcpy(ss.__data, bond->dev->dev_addr, bond->dev->addr_len);
1251 ss.ss_family = bond->dev->type;
1252
1253 /* unwind from head to the slave that failed */
1254 bond_for_each_slave(bond, rollback_slave, iter) {
1255 if (rollback_slave == slave)
1256 break;
1257 bond_hw_addr_copy(tmp_addr, rollback_slave->dev->dev_addr,
1258 rollback_slave->dev->addr_len);
1259 dev_set_mac_address(rollback_slave->dev,
1260 (struct sockaddr *)&ss, NULL);
1261 bond_hw_addr_copy(rollback_slave->dev->dev_addr, tmp_addr,
1262 rollback_slave->dev->addr_len);
1263 }
1264
1265 return res;
1266}
1267
1268/************************ exported alb funcions ************************/
1269
1270int bond_alb_initialize(struct bonding *bond, int rlb_enabled)
1271{
1272 int res;
1273
1274 res = tlb_initialize(bond);
1275 if (res)
1276 return res;
1277
1278 if (rlb_enabled) {
1279 bond->alb_info.rlb_enabled = 1;
1280 res = rlb_initialize(bond);
1281 if (res) {
1282 tlb_deinitialize(bond);
1283 return res;
1284 }
1285 } else {
1286 bond->alb_info.rlb_enabled = 0;
1287 }
1288
1289 return 0;
1290}
1291
1292void bond_alb_deinitialize(struct bonding *bond)
1293{
1294 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1295
1296 tlb_deinitialize(bond);
1297
1298 if (bond_info->rlb_enabled)
1299 rlb_deinitialize(bond);
1300}
1301
1302static netdev_tx_t bond_do_alb_xmit(struct sk_buff *skb, struct bonding *bond,
1303 struct slave *tx_slave)
1304{
1305 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1306 struct ethhdr *eth_data = eth_hdr(skb);
1307
1308 if (!tx_slave) {
1309 /* unbalanced or unassigned, send through primary */
1310 tx_slave = rcu_dereference(bond->curr_active_slave);
1311 if (bond->params.tlb_dynamic_lb)
1312 bond_info->unbalanced_load += skb->len;
1313 }
1314
1315 if (tx_slave && bond_slave_can_tx(tx_slave)) {
1316 if (tx_slave != rcu_access_pointer(bond->curr_active_slave)) {
1317 ether_addr_copy(eth_data->h_source,
1318 tx_slave->dev->dev_addr);
1319 }
1320
1321 bond_dev_queue_xmit(bond, skb, tx_slave->dev);
1322 goto out;
1323 }
1324
1325 if (tx_slave && bond->params.tlb_dynamic_lb) {
1326 spin_lock(&bond->mode_lock);
1327 __tlb_clear_slave(bond, tx_slave, 0);
1328 spin_unlock(&bond->mode_lock);
1329 }
1330
1331 /* no suitable interface, frame not sent */
1332 bond_tx_drop(bond->dev, skb);
1333out:
1334 return NETDEV_TX_OK;
1335}
1336
1337netdev_tx_t bond_tlb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
1338{
1339 struct bonding *bond = netdev_priv(bond_dev);
1340 struct ethhdr *eth_data;
1341 struct slave *tx_slave = NULL;
1342 u32 hash_index;
1343
1344 skb_reset_mac_header(skb);
1345 eth_data = eth_hdr(skb);
1346
1347 /* Do not TX balance any multicast or broadcast */
1348 if (!is_multicast_ether_addr(eth_data->h_dest)) {
1349 switch (skb->protocol) {
1350 case htons(ETH_P_IP):
1351 case htons(ETH_P_IPX):
1352 /* In case of IPX, it will falback to L2 hash */
1353 case htons(ETH_P_IPV6):
1354 hash_index = bond_xmit_hash(bond, skb);
1355 if (bond->params.tlb_dynamic_lb) {
1356 tx_slave = tlb_choose_channel(bond,
1357 hash_index & 0xFF,
1358 skb->len);
1359 } else {
1360 struct bond_up_slave *slaves;
1361 unsigned int count;
1362
1363 slaves = rcu_dereference(bond->slave_arr);
1364 count = slaves ? READ_ONCE(slaves->count) : 0;
1365 if (likely(count))
1366 tx_slave = slaves->arr[hash_index %
1367 count];
1368 }
1369 break;
1370 }
1371 }
1372 return bond_do_alb_xmit(skb, bond, tx_slave);
1373}
1374
1375netdev_tx_t bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
1376{
1377 struct bonding *bond = netdev_priv(bond_dev);
1378 struct ethhdr *eth_data;
1379 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1380 struct slave *tx_slave = NULL;
1381 static const __be32 ip_bcast = htonl(0xffffffff);
1382 int hash_size = 0;
1383 bool do_tx_balance = true;
1384 u32 hash_index = 0;
1385 const u8 *hash_start = NULL;
1386 struct ipv6hdr *ip6hdr;
1387
1388 skb_reset_mac_header(skb);
1389 eth_data = eth_hdr(skb);
1390
1391 switch (ntohs(skb->protocol)) {
1392 case ETH_P_IP: {
1393 const struct iphdr *iph = ip_hdr(skb);
1394
1395 if (is_broadcast_ether_addr(eth_data->h_dest) ||
1396 iph->daddr == ip_bcast ||
1397 iph->protocol == IPPROTO_IGMP) {
1398 do_tx_balance = false;
1399 break;
1400 }
1401 hash_start = (char *)&(iph->daddr);
1402 hash_size = sizeof(iph->daddr);
1403 }
1404 break;
1405 case ETH_P_IPV6:
1406 /* IPv6 doesn't really use broadcast mac address, but leave
1407 * that here just in case.
1408 */
1409 if (is_broadcast_ether_addr(eth_data->h_dest)) {
1410 do_tx_balance = false;
1411 break;
1412 }
1413
1414 /* IPv6 uses all-nodes multicast as an equivalent to
1415 * broadcasts in IPv4.
1416 */
1417 if (ether_addr_equal_64bits(eth_data->h_dest, mac_v6_allmcast)) {
1418 do_tx_balance = false;
1419 break;
1420 }
1421
1422 /* Additianally, DAD probes should not be tx-balanced as that
1423 * will lead to false positives for duplicate addresses and
1424 * prevent address configuration from working.
1425 */
1426 ip6hdr = ipv6_hdr(skb);
1427 if (ipv6_addr_any(&ip6hdr->saddr)) {
1428 do_tx_balance = false;
1429 break;
1430 }
1431
1432 hash_start = (char *)&(ipv6_hdr(skb)->daddr);
1433 hash_size = sizeof(ipv6_hdr(skb)->daddr);
1434 break;
1435 case ETH_P_IPX:
1436 if (ipx_hdr(skb)->ipx_checksum != IPX_NO_CHECKSUM) {
1437 /* something is wrong with this packet */
1438 do_tx_balance = false;
1439 break;
1440 }
1441
1442 if (ipx_hdr(skb)->ipx_type != IPX_TYPE_NCP) {
1443 /* The only protocol worth balancing in
1444 * this family since it has an "ARP" like
1445 * mechanism
1446 */
1447 do_tx_balance = false;
1448 break;
1449 }
1450
1451 hash_start = (char *)eth_data->h_dest;
1452 hash_size = ETH_ALEN;
1453 break;
1454 case ETH_P_ARP:
1455 do_tx_balance = false;
1456 if (bond_info->rlb_enabled)
1457 tx_slave = rlb_arp_xmit(skb, bond);
1458 break;
1459 default:
1460 do_tx_balance = false;
1461 break;
1462 }
1463
1464 if (do_tx_balance) {
1465 if (bond->params.tlb_dynamic_lb) {
1466 hash_index = _simple_hash(hash_start, hash_size);
1467 tx_slave = tlb_choose_channel(bond, hash_index, skb->len);
1468 } else {
1469 /*
1470 * do_tx_balance means we are free to select the tx_slave
1471 * So we do exactly what tlb would do for hash selection
1472 */
1473
1474 struct bond_up_slave *slaves;
1475 unsigned int count;
1476
1477 slaves = rcu_dereference(bond->slave_arr);
1478 count = slaves ? READ_ONCE(slaves->count) : 0;
1479 if (likely(count))
1480 tx_slave = slaves->arr[bond_xmit_hash(bond, skb) %
1481 count];
1482 }
1483 }
1484
1485 return bond_do_alb_xmit(skb, bond, tx_slave);
1486}
1487
1488void bond_alb_monitor(struct work_struct *work)
1489{
1490 struct bonding *bond = container_of(work, struct bonding,
1491 alb_work.work);
1492 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1493 struct list_head *iter;
1494 struct slave *slave;
1495
1496 if (!bond_has_slaves(bond)) {
1497 bond_info->tx_rebalance_counter = 0;
1498 bond_info->lp_counter = 0;
1499 goto re_arm;
1500 }
1501
1502 rcu_read_lock();
1503
1504 bond_info->tx_rebalance_counter++;
1505 bond_info->lp_counter++;
1506
1507 /* send learning packets */
1508 if (bond_info->lp_counter >= BOND_ALB_LP_TICKS(bond)) {
1509 bool strict_match;
1510
1511 bond_for_each_slave_rcu(bond, slave, iter) {
1512 /* If updating current_active, use all currently
1513 * user mac addreses (!strict_match). Otherwise, only
1514 * use mac of the slave device.
1515 * In RLB mode, we always use strict matches.
1516 */
1517 strict_match = (slave != rcu_access_pointer(bond->curr_active_slave) ||
1518 bond_info->rlb_enabled);
1519 alb_send_learning_packets(slave, slave->dev->dev_addr,
1520 strict_match);
1521 }
1522 bond_info->lp_counter = 0;
1523 }
1524
1525 /* rebalance tx traffic */
1526 if (bond_info->tx_rebalance_counter >= BOND_TLB_REBALANCE_TICKS) {
1527 bond_for_each_slave_rcu(bond, slave, iter) {
1528 tlb_clear_slave(bond, slave, 1);
1529 if (slave == rcu_access_pointer(bond->curr_active_slave)) {
1530 SLAVE_TLB_INFO(slave).load =
1531 bond_info->unbalanced_load /
1532 BOND_TLB_REBALANCE_INTERVAL;
1533 bond_info->unbalanced_load = 0;
1534 }
1535 }
1536 bond_info->tx_rebalance_counter = 0;
1537 }
1538
1539 if (bond_info->rlb_enabled) {
1540 if (bond_info->primary_is_promisc &&
1541 (++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) {
1542
1543 /* dev_set_promiscuity requires rtnl and
1544 * nothing else. Avoid race with bond_close.
1545 */
1546 rcu_read_unlock();
1547 if (!rtnl_trylock())
1548 goto re_arm;
1549
1550 bond_info->rlb_promisc_timeout_counter = 0;
1551
1552 /* If the primary was set to promiscuous mode
1553 * because a slave was disabled then
1554 * it can now leave promiscuous mode.
1555 */
1556 dev_set_promiscuity(rtnl_dereference(bond->curr_active_slave)->dev,
1557 -1);
1558 bond_info->primary_is_promisc = 0;
1559
1560 rtnl_unlock();
1561 rcu_read_lock();
1562 }
1563
1564 if (bond_info->rlb_rebalance) {
1565 bond_info->rlb_rebalance = 0;
1566 rlb_rebalance(bond);
1567 }
1568
1569 /* check if clients need updating */
1570 if (bond_info->rx_ntt) {
1571 if (bond_info->rlb_update_delay_counter) {
1572 --bond_info->rlb_update_delay_counter;
1573 } else {
1574 rlb_update_rx_clients(bond);
1575 if (bond_info->rlb_update_retry_counter)
1576 --bond_info->rlb_update_retry_counter;
1577 else
1578 bond_info->rx_ntt = 0;
1579 }
1580 }
1581 }
1582 rcu_read_unlock();
1583re_arm:
1584 queue_delayed_work(bond->wq, &bond->alb_work, alb_delta_in_ticks);
1585}
1586
1587/* assumption: called before the slave is attached to the bond
1588 * and not locked by the bond lock
1589 */
1590int bond_alb_init_slave(struct bonding *bond, struct slave *slave)
1591{
1592 int res;
1593
1594 res = alb_set_slave_mac_addr(slave, slave->perm_hwaddr,
1595 slave->dev->addr_len);
1596 if (res)
1597 return res;
1598
1599 res = alb_handle_addr_collision_on_attach(bond, slave);
1600 if (res)
1601 return res;
1602
1603 tlb_init_slave(slave);
1604
1605 /* order a rebalance ASAP */
1606 bond->alb_info.tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS;
1607
1608 if (bond->alb_info.rlb_enabled)
1609 bond->alb_info.rlb_rebalance = 1;
1610
1611 return 0;
1612}
1613
1614/* Remove slave from tlb and rlb hash tables, and fix up MAC addresses
1615 * if necessary.
1616 *
1617 * Caller must hold RTNL and no other locks
1618 */
1619void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave)
1620{
1621 if (bond_has_slaves(bond))
1622 alb_change_hw_addr_on_detach(bond, slave);
1623
1624 tlb_clear_slave(bond, slave, 0);
1625
1626 if (bond->alb_info.rlb_enabled) {
1627 bond->alb_info.rx_slave = NULL;
1628 rlb_clear_slave(bond, slave);
1629 }
1630
1631}
1632
1633void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link)
1634{
1635 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1636
1637 if (link == BOND_LINK_DOWN) {
1638 tlb_clear_slave(bond, slave, 0);
1639 if (bond->alb_info.rlb_enabled)
1640 rlb_clear_slave(bond, slave);
1641 } else if (link == BOND_LINK_UP) {
1642 /* order a rebalance ASAP */
1643 bond_info->tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS;
1644 if (bond->alb_info.rlb_enabled) {
1645 bond->alb_info.rlb_rebalance = 1;
1646 /* If the updelay module parameter is smaller than the
1647 * forwarding delay of the switch the rebalance will
1648 * not work because the rebalance arp replies will
1649 * not be forwarded to the clients..
1650 */
1651 }
1652 }
1653
1654 if (bond_is_nondyn_tlb(bond)) {
1655 if (bond_update_slave_arr(bond, NULL))
1656 pr_err("Failed to build slave-array for TLB mode.\n");
1657 }
1658}
1659
1660/**
1661 * bond_alb_handle_active_change - assign new curr_active_slave
1662 * @bond: our bonding struct
1663 * @new_slave: new slave to assign
1664 *
1665 * Set the bond->curr_active_slave to @new_slave and handle
1666 * mac address swapping and promiscuity changes as needed.
1667 *
1668 * Caller must hold RTNL
1669 */
1670void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave)
1671{
1672 struct slave *swap_slave;
1673 struct slave *curr_active;
1674
1675 curr_active = rtnl_dereference(bond->curr_active_slave);
1676 if (curr_active == new_slave)
1677 return;
1678
1679 if (curr_active && bond->alb_info.primary_is_promisc) {
1680 dev_set_promiscuity(curr_active->dev, -1);
1681 bond->alb_info.primary_is_promisc = 0;
1682 bond->alb_info.rlb_promisc_timeout_counter = 0;
1683 }
1684
1685 swap_slave = curr_active;
1686 rcu_assign_pointer(bond->curr_active_slave, new_slave);
1687
1688 if (!new_slave || !bond_has_slaves(bond))
1689 return;
1690
1691 /* set the new curr_active_slave to the bonds mac address
1692 * i.e. swap mac addresses of old curr_active_slave and new curr_active_slave
1693 */
1694 if (!swap_slave)
1695 swap_slave = bond_slave_has_mac(bond, bond->dev->dev_addr);
1696
1697 /* Arrange for swap_slave and new_slave to temporarily be
1698 * ignored so we can mess with their MAC addresses without
1699 * fear of interference from transmit activity.
1700 */
1701 if (swap_slave)
1702 tlb_clear_slave(bond, swap_slave, 1);
1703 tlb_clear_slave(bond, new_slave, 1);
1704
1705 /* in TLB mode, the slave might flip down/up with the old dev_addr,
1706 * and thus filter bond->dev_addr's packets, so force bond's mac
1707 */
1708 if (BOND_MODE(bond) == BOND_MODE_TLB) {
1709 struct sockaddr_storage ss;
1710 u8 tmp_addr[MAX_ADDR_LEN];
1711
1712 bond_hw_addr_copy(tmp_addr, new_slave->dev->dev_addr,
1713 new_slave->dev->addr_len);
1714
1715 bond_hw_addr_copy(ss.__data, bond->dev->dev_addr,
1716 bond->dev->addr_len);
1717 ss.ss_family = bond->dev->type;
1718 /* we don't care if it can't change its mac, best effort */
1719 dev_set_mac_address(new_slave->dev, (struct sockaddr *)&ss,
1720 NULL);
1721
1722 bond_hw_addr_copy(new_slave->dev->dev_addr, tmp_addr,
1723 new_slave->dev->addr_len);
1724 }
1725
1726 /* curr_active_slave must be set before calling alb_swap_mac_addr */
1727 if (swap_slave) {
1728 /* swap mac address */
1729 alb_swap_mac_addr(swap_slave, new_slave);
1730 alb_fasten_mac_swap(bond, swap_slave, new_slave);
1731 } else {
1732 /* set the new_slave to the bond mac address */
1733 alb_set_slave_mac_addr(new_slave, bond->dev->dev_addr,
1734 bond->dev->addr_len);
1735 alb_send_learning_packets(new_slave, bond->dev->dev_addr,
1736 false);
1737 }
1738}
1739
1740/* Called with RTNL */
1741int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr)
1742{
1743 struct bonding *bond = netdev_priv(bond_dev);
1744 struct sockaddr_storage *ss = addr;
1745 struct slave *curr_active;
1746 struct slave *swap_slave;
1747 int res;
1748
1749 if (!is_valid_ether_addr(ss->__data))
1750 return -EADDRNOTAVAIL;
1751
1752 res = alb_set_mac_address(bond, addr);
1753 if (res)
1754 return res;
1755
1756 bond_hw_addr_copy(bond_dev->dev_addr, ss->__data, bond_dev->addr_len);
1757
1758 /* If there is no curr_active_slave there is nothing else to do.
1759 * Otherwise we'll need to pass the new address to it and handle
1760 * duplications.
1761 */
1762 curr_active = rtnl_dereference(bond->curr_active_slave);
1763 if (!curr_active)
1764 return 0;
1765
1766 swap_slave = bond_slave_has_mac(bond, bond_dev->dev_addr);
1767
1768 if (swap_slave) {
1769 alb_swap_mac_addr(swap_slave, curr_active);
1770 alb_fasten_mac_swap(bond, swap_slave, curr_active);
1771 } else {
1772 alb_set_slave_mac_addr(curr_active, bond_dev->dev_addr,
1773 bond_dev->addr_len);
1774
1775 alb_send_learning_packets(curr_active,
1776 bond_dev->dev_addr, false);
1777 if (bond->alb_info.rlb_enabled) {
1778 /* inform clients mac address has changed */
1779 rlb_req_update_slave_clients(bond, curr_active);
1780 }
1781 }
1782
1783 return 0;
1784}
1785
1786void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
1787{
1788 if (bond->alb_info.rlb_enabled)
1789 rlb_clear_vlan(bond, vlan_id);
1790}
1791
1/*
2 * Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved.
3 *
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.
8 *
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
12 * for more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17 *
18 * The full GNU General Public License is included in this distribution in the
19 * file called LICENSE.
20 *
21 */
22
23#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24
25#include <linux/skbuff.h>
26#include <linux/netdevice.h>
27#include <linux/etherdevice.h>
28#include <linux/pkt_sched.h>
29#include <linux/spinlock.h>
30#include <linux/slab.h>
31#include <linux/timer.h>
32#include <linux/ip.h>
33#include <linux/ipv6.h>
34#include <linux/if_arp.h>
35#include <linux/if_ether.h>
36#include <linux/if_bonding.h>
37#include <linux/if_vlan.h>
38#include <linux/in.h>
39#include <net/ipx.h>
40#include <net/arp.h>
41#include <net/ipv6.h>
42#include <asm/byteorder.h>
43#include "bonding.h"
44#include "bond_alb.h"
45
46
47
48#ifndef __long_aligned
49#define __long_aligned __attribute__((aligned((sizeof(long)))))
50#endif
51static const u8 mac_bcast[ETH_ALEN] __long_aligned = {
52 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
53};
54static const u8 mac_v6_allmcast[ETH_ALEN] __long_aligned = {
55 0x33, 0x33, 0x00, 0x00, 0x00, 0x01
56};
57static const int alb_delta_in_ticks = HZ / ALB_TIMER_TICKS_PER_SEC;
58
59#pragma pack(1)
60struct learning_pkt {
61 u8 mac_dst[ETH_ALEN];
62 u8 mac_src[ETH_ALEN];
63 __be16 type;
64 u8 padding[ETH_ZLEN - ETH_HLEN];
65};
66
67struct arp_pkt {
68 __be16 hw_addr_space;
69 __be16 prot_addr_space;
70 u8 hw_addr_len;
71 u8 prot_addr_len;
72 __be16 op_code;
73 u8 mac_src[ETH_ALEN]; /* sender hardware address */
74 __be32 ip_src; /* sender IP address */
75 u8 mac_dst[ETH_ALEN]; /* target hardware address */
76 __be32 ip_dst; /* target IP address */
77};
78#pragma pack()
79
80static inline struct arp_pkt *arp_pkt(const struct sk_buff *skb)
81{
82 return (struct arp_pkt *)skb_network_header(skb);
83}
84
85/* Forward declaration */
86static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[]);
87
88static inline u8 _simple_hash(const u8 *hash_start, int hash_size)
89{
90 int i;
91 u8 hash = 0;
92
93 for (i = 0; i < hash_size; i++) {
94 hash ^= hash_start[i];
95 }
96
97 return hash;
98}
99
100/*********************** tlb specific functions ***************************/
101
102static inline void _lock_tx_hashtbl_bh(struct bonding *bond)
103{
104 spin_lock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock));
105}
106
107static inline void _unlock_tx_hashtbl_bh(struct bonding *bond)
108{
109 spin_unlock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock));
110}
111
112static inline void _lock_tx_hashtbl(struct bonding *bond)
113{
114 spin_lock(&(BOND_ALB_INFO(bond).tx_hashtbl_lock));
115}
116
117static inline void _unlock_tx_hashtbl(struct bonding *bond)
118{
119 spin_unlock(&(BOND_ALB_INFO(bond).tx_hashtbl_lock));
120}
121
122/* Caller must hold tx_hashtbl lock */
123static inline void tlb_init_table_entry(struct tlb_client_info *entry, int save_load)
124{
125 if (save_load) {
126 entry->load_history = 1 + entry->tx_bytes /
127 BOND_TLB_REBALANCE_INTERVAL;
128 entry->tx_bytes = 0;
129 }
130
131 entry->tx_slave = NULL;
132 entry->next = TLB_NULL_INDEX;
133 entry->prev = TLB_NULL_INDEX;
134}
135
136static inline void tlb_init_slave(struct slave *slave)
137{
138 SLAVE_TLB_INFO(slave).load = 0;
139 SLAVE_TLB_INFO(slave).head = TLB_NULL_INDEX;
140}
141
142/* Caller must hold bond lock for read, BH disabled */
143static void __tlb_clear_slave(struct bonding *bond, struct slave *slave,
144 int save_load)
145{
146 struct tlb_client_info *tx_hash_table;
147 u32 index;
148
149 /* clear slave from tx_hashtbl */
150 tx_hash_table = BOND_ALB_INFO(bond).tx_hashtbl;
151
152 /* skip this if we've already freed the tx hash table */
153 if (tx_hash_table) {
154 index = SLAVE_TLB_INFO(slave).head;
155 while (index != TLB_NULL_INDEX) {
156 u32 next_index = tx_hash_table[index].next;
157 tlb_init_table_entry(&tx_hash_table[index], save_load);
158 index = next_index;
159 }
160 }
161
162 tlb_init_slave(slave);
163}
164
165/* Caller must hold bond lock for read */
166static void tlb_clear_slave(struct bonding *bond, struct slave *slave,
167 int save_load)
168{
169 _lock_tx_hashtbl_bh(bond);
170 __tlb_clear_slave(bond, slave, save_load);
171 _unlock_tx_hashtbl_bh(bond);
172}
173
174/* Must be called before starting the monitor timer */
175static int tlb_initialize(struct bonding *bond)
176{
177 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
178 int size = TLB_HASH_TABLE_SIZE * sizeof(struct tlb_client_info);
179 struct tlb_client_info *new_hashtbl;
180 int i;
181
182 new_hashtbl = kzalloc(size, GFP_KERNEL);
183 if (!new_hashtbl)
184 return -1;
185
186 _lock_tx_hashtbl_bh(bond);
187
188 bond_info->tx_hashtbl = new_hashtbl;
189
190 for (i = 0; i < TLB_HASH_TABLE_SIZE; i++) {
191 tlb_init_table_entry(&bond_info->tx_hashtbl[i], 0);
192 }
193
194 _unlock_tx_hashtbl_bh(bond);
195
196 return 0;
197}
198
199/* Must be called only after all slaves have been released */
200static void tlb_deinitialize(struct bonding *bond)
201{
202 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
203
204 _lock_tx_hashtbl_bh(bond);
205
206 kfree(bond_info->tx_hashtbl);
207 bond_info->tx_hashtbl = NULL;
208
209 _unlock_tx_hashtbl_bh(bond);
210}
211
212static long long compute_gap(struct slave *slave)
213{
214 return (s64) (slave->speed << 20) - /* Convert to Megabit per sec */
215 (s64) (SLAVE_TLB_INFO(slave).load << 3); /* Bytes to bits */
216}
217
218/* Caller must hold bond lock for read */
219static struct slave *tlb_get_least_loaded_slave(struct bonding *bond)
220{
221 struct slave *slave, *least_loaded;
222 long long max_gap;
223 int i;
224
225 least_loaded = NULL;
226 max_gap = LLONG_MIN;
227
228 /* Find the slave with the largest gap */
229 bond_for_each_slave(bond, slave, i) {
230 if (SLAVE_IS_OK(slave)) {
231 long long gap = compute_gap(slave);
232
233 if (max_gap < gap) {
234 least_loaded = slave;
235 max_gap = gap;
236 }
237 }
238 }
239
240 return least_loaded;
241}
242
243static struct slave *__tlb_choose_channel(struct bonding *bond, u32 hash_index,
244 u32 skb_len)
245{
246 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
247 struct tlb_client_info *hash_table;
248 struct slave *assigned_slave;
249
250 hash_table = bond_info->tx_hashtbl;
251 assigned_slave = hash_table[hash_index].tx_slave;
252 if (!assigned_slave) {
253 assigned_slave = tlb_get_least_loaded_slave(bond);
254
255 if (assigned_slave) {
256 struct tlb_slave_info *slave_info =
257 &(SLAVE_TLB_INFO(assigned_slave));
258 u32 next_index = slave_info->head;
259
260 hash_table[hash_index].tx_slave = assigned_slave;
261 hash_table[hash_index].next = next_index;
262 hash_table[hash_index].prev = TLB_NULL_INDEX;
263
264 if (next_index != TLB_NULL_INDEX) {
265 hash_table[next_index].prev = hash_index;
266 }
267
268 slave_info->head = hash_index;
269 slave_info->load +=
270 hash_table[hash_index].load_history;
271 }
272 }
273
274 if (assigned_slave) {
275 hash_table[hash_index].tx_bytes += skb_len;
276 }
277
278 return assigned_slave;
279}
280
281/* Caller must hold bond lock for read */
282static struct slave *tlb_choose_channel(struct bonding *bond, u32 hash_index,
283 u32 skb_len)
284{
285 struct slave *tx_slave;
286 /*
287 * We don't need to disable softirq here, becase
288 * tlb_choose_channel() is only called by bond_alb_xmit()
289 * which already has softirq disabled.
290 */
291 _lock_tx_hashtbl(bond);
292 tx_slave = __tlb_choose_channel(bond, hash_index, skb_len);
293 _unlock_tx_hashtbl(bond);
294 return tx_slave;
295}
296
297/*********************** rlb specific functions ***************************/
298static inline void _lock_rx_hashtbl_bh(struct bonding *bond)
299{
300 spin_lock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock));
301}
302
303static inline void _unlock_rx_hashtbl_bh(struct bonding *bond)
304{
305 spin_unlock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock));
306}
307
308static inline void _lock_rx_hashtbl(struct bonding *bond)
309{
310 spin_lock(&(BOND_ALB_INFO(bond).rx_hashtbl_lock));
311}
312
313static inline void _unlock_rx_hashtbl(struct bonding *bond)
314{
315 spin_unlock(&(BOND_ALB_INFO(bond).rx_hashtbl_lock));
316}
317
318/* when an ARP REPLY is received from a client update its info
319 * in the rx_hashtbl
320 */
321static void rlb_update_entry_from_arp(struct bonding *bond, struct arp_pkt *arp)
322{
323 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
324 struct rlb_client_info *client_info;
325 u32 hash_index;
326
327 _lock_rx_hashtbl_bh(bond);
328
329 hash_index = _simple_hash((u8*)&(arp->ip_src), sizeof(arp->ip_src));
330 client_info = &(bond_info->rx_hashtbl[hash_index]);
331
332 if ((client_info->assigned) &&
333 (client_info->ip_src == arp->ip_dst) &&
334 (client_info->ip_dst == arp->ip_src) &&
335 (!ether_addr_equal_64bits(client_info->mac_dst, arp->mac_src))) {
336 /* update the clients MAC address */
337 memcpy(client_info->mac_dst, arp->mac_src, ETH_ALEN);
338 client_info->ntt = 1;
339 bond_info->rx_ntt = 1;
340 }
341
342 _unlock_rx_hashtbl_bh(bond);
343}
344
345static int rlb_arp_recv(struct sk_buff *skb, struct bonding *bond,
346 struct slave *slave)
347{
348 struct arp_pkt *arp;
349
350 if (skb->protocol != cpu_to_be16(ETH_P_ARP))
351 goto out;
352
353 arp = (struct arp_pkt *) skb->data;
354 if (!arp) {
355 pr_debug("Packet has no ARP data\n");
356 goto out;
357 }
358
359 if (!pskb_may_pull(skb, arp_hdr_len(bond->dev)))
360 goto out;
361
362 if (skb->len < sizeof(struct arp_pkt)) {
363 pr_debug("Packet is too small to be an ARP\n");
364 goto out;
365 }
366
367 if (arp->op_code == htons(ARPOP_REPLY)) {
368 /* update rx hash table for this ARP */
369 rlb_update_entry_from_arp(bond, arp);
370 pr_debug("Server received an ARP Reply from client\n");
371 }
372out:
373 return RX_HANDLER_ANOTHER;
374}
375
376/* Caller must hold bond lock for read */
377static struct slave *rlb_next_rx_slave(struct bonding *bond)
378{
379 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
380 struct slave *rx_slave, *slave, *start_at;
381 int i = 0;
382
383 if (bond_info->next_rx_slave) {
384 start_at = bond_info->next_rx_slave;
385 } else {
386 start_at = bond->first_slave;
387 }
388
389 rx_slave = NULL;
390
391 bond_for_each_slave_from(bond, slave, i, start_at) {
392 if (SLAVE_IS_OK(slave)) {
393 if (!rx_slave) {
394 rx_slave = slave;
395 } else if (slave->speed > rx_slave->speed) {
396 rx_slave = slave;
397 }
398 }
399 }
400
401 if (rx_slave) {
402 bond_info->next_rx_slave = rx_slave->next;
403 }
404
405 return rx_slave;
406}
407
408/* teach the switch the mac of a disabled slave
409 * on the primary for fault tolerance
410 *
411 * Caller must hold bond->curr_slave_lock for write or bond lock for write
412 */
413static void rlb_teach_disabled_mac_on_primary(struct bonding *bond, u8 addr[])
414{
415 if (!bond->curr_active_slave) {
416 return;
417 }
418
419 if (!bond->alb_info.primary_is_promisc) {
420 if (!dev_set_promiscuity(bond->curr_active_slave->dev, 1))
421 bond->alb_info.primary_is_promisc = 1;
422 else
423 bond->alb_info.primary_is_promisc = 0;
424 }
425
426 bond->alb_info.rlb_promisc_timeout_counter = 0;
427
428 alb_send_learning_packets(bond->curr_active_slave, addr);
429}
430
431/* slave being removed should not be active at this point
432 *
433 * Caller must hold bond lock for read
434 */
435static void rlb_clear_slave(struct bonding *bond, struct slave *slave)
436{
437 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
438 struct rlb_client_info *rx_hash_table;
439 u32 index, next_index;
440
441 /* clear slave from rx_hashtbl */
442 _lock_rx_hashtbl_bh(bond);
443
444 rx_hash_table = bond_info->rx_hashtbl;
445 index = bond_info->rx_hashtbl_head;
446 for (; index != RLB_NULL_INDEX; index = next_index) {
447 next_index = rx_hash_table[index].next;
448 if (rx_hash_table[index].slave == slave) {
449 struct slave *assigned_slave = rlb_next_rx_slave(bond);
450
451 if (assigned_slave) {
452 rx_hash_table[index].slave = assigned_slave;
453 if (!ether_addr_equal_64bits(rx_hash_table[index].mac_dst,
454 mac_bcast)) {
455 bond_info->rx_hashtbl[index].ntt = 1;
456 bond_info->rx_ntt = 1;
457 /* A slave has been removed from the
458 * table because it is either disabled
459 * or being released. We must retry the
460 * update to avoid clients from not
461 * being updated & disconnecting when
462 * there is stress
463 */
464 bond_info->rlb_update_retry_counter =
465 RLB_UPDATE_RETRY;
466 }
467 } else { /* there is no active slave */
468 rx_hash_table[index].slave = NULL;
469 }
470 }
471 }
472
473 _unlock_rx_hashtbl_bh(bond);
474
475 write_lock_bh(&bond->curr_slave_lock);
476
477 if (slave != bond->curr_active_slave) {
478 rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr);
479 }
480
481 write_unlock_bh(&bond->curr_slave_lock);
482}
483
484static void rlb_update_client(struct rlb_client_info *client_info)
485{
486 int i;
487
488 if (!client_info->slave) {
489 return;
490 }
491
492 for (i = 0; i < RLB_ARP_BURST_SIZE; i++) {
493 struct sk_buff *skb;
494
495 skb = arp_create(ARPOP_REPLY, ETH_P_ARP,
496 client_info->ip_dst,
497 client_info->slave->dev,
498 client_info->ip_src,
499 client_info->mac_dst,
500 client_info->slave->dev->dev_addr,
501 client_info->mac_dst);
502 if (!skb) {
503 pr_err("%s: Error: failed to create an ARP packet\n",
504 client_info->slave->dev->master->name);
505 continue;
506 }
507
508 skb->dev = client_info->slave->dev;
509
510 if (client_info->tag) {
511 skb = vlan_put_tag(skb, client_info->vlan_id);
512 if (!skb) {
513 pr_err("%s: Error: failed to insert VLAN tag\n",
514 client_info->slave->dev->master->name);
515 continue;
516 }
517 }
518
519 arp_xmit(skb);
520 }
521}
522
523/* sends ARP REPLIES that update the clients that need updating */
524static void rlb_update_rx_clients(struct bonding *bond)
525{
526 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
527 struct rlb_client_info *client_info;
528 u32 hash_index;
529
530 _lock_rx_hashtbl_bh(bond);
531
532 hash_index = bond_info->rx_hashtbl_head;
533 for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) {
534 client_info = &(bond_info->rx_hashtbl[hash_index]);
535 if (client_info->ntt) {
536 rlb_update_client(client_info);
537 if (bond_info->rlb_update_retry_counter == 0) {
538 client_info->ntt = 0;
539 }
540 }
541 }
542
543 /* do not update the entries again until this counter is zero so that
544 * not to confuse the clients.
545 */
546 bond_info->rlb_update_delay_counter = RLB_UPDATE_DELAY;
547
548 _unlock_rx_hashtbl_bh(bond);
549}
550
551/* The slave was assigned a new mac address - update the clients */
552static void rlb_req_update_slave_clients(struct bonding *bond, struct slave *slave)
553{
554 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
555 struct rlb_client_info *client_info;
556 int ntt = 0;
557 u32 hash_index;
558
559 _lock_rx_hashtbl_bh(bond);
560
561 hash_index = bond_info->rx_hashtbl_head;
562 for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) {
563 client_info = &(bond_info->rx_hashtbl[hash_index]);
564
565 if ((client_info->slave == slave) &&
566 !ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) {
567 client_info->ntt = 1;
568 ntt = 1;
569 }
570 }
571
572 // update the team's flag only after the whole iteration
573 if (ntt) {
574 bond_info->rx_ntt = 1;
575 //fasten the change
576 bond_info->rlb_update_retry_counter = RLB_UPDATE_RETRY;
577 }
578
579 _unlock_rx_hashtbl_bh(bond);
580}
581
582/* mark all clients using src_ip to be updated */
583static void rlb_req_update_subnet_clients(struct bonding *bond, __be32 src_ip)
584{
585 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
586 struct rlb_client_info *client_info;
587 u32 hash_index;
588
589 _lock_rx_hashtbl(bond);
590
591 hash_index = bond_info->rx_hashtbl_head;
592 for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) {
593 client_info = &(bond_info->rx_hashtbl[hash_index]);
594
595 if (!client_info->slave) {
596 pr_err("%s: Error: found a client with no channel in the client's hash table\n",
597 bond->dev->name);
598 continue;
599 }
600 /*update all clients using this src_ip, that are not assigned
601 * to the team's address (curr_active_slave) and have a known
602 * unicast mac address.
603 */
604 if ((client_info->ip_src == src_ip) &&
605 !ether_addr_equal_64bits(client_info->slave->dev->dev_addr,
606 bond->dev->dev_addr) &&
607 !ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) {
608 client_info->ntt = 1;
609 bond_info->rx_ntt = 1;
610 }
611 }
612
613 _unlock_rx_hashtbl(bond);
614}
615
616/* Caller must hold both bond and ptr locks for read */
617static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bond)
618{
619 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
620 struct arp_pkt *arp = arp_pkt(skb);
621 struct slave *assigned_slave;
622 struct rlb_client_info *client_info;
623 u32 hash_index = 0;
624
625 _lock_rx_hashtbl(bond);
626
627 hash_index = _simple_hash((u8 *)&arp->ip_dst, sizeof(arp->ip_dst));
628 client_info = &(bond_info->rx_hashtbl[hash_index]);
629
630 if (client_info->assigned) {
631 if ((client_info->ip_src == arp->ip_src) &&
632 (client_info->ip_dst == arp->ip_dst)) {
633 /* the entry is already assigned to this client */
634 if (!ether_addr_equal_64bits(arp->mac_dst, mac_bcast)) {
635 /* update mac address from arp */
636 memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN);
637 }
638
639 assigned_slave = client_info->slave;
640 if (assigned_slave) {
641 _unlock_rx_hashtbl(bond);
642 return assigned_slave;
643 }
644 } else {
645 /* the entry is already assigned to some other client,
646 * move the old client to primary (curr_active_slave) so
647 * that the new client can be assigned to this entry.
648 */
649 if (bond->curr_active_slave &&
650 client_info->slave != bond->curr_active_slave) {
651 client_info->slave = bond->curr_active_slave;
652 rlb_update_client(client_info);
653 }
654 }
655 }
656 /* assign a new slave */
657 assigned_slave = rlb_next_rx_slave(bond);
658
659 if (assigned_slave) {
660 client_info->ip_src = arp->ip_src;
661 client_info->ip_dst = arp->ip_dst;
662 /* arp->mac_dst is broadcast for arp reqeusts.
663 * will be updated with clients actual unicast mac address
664 * upon receiving an arp reply.
665 */
666 memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN);
667 client_info->slave = assigned_slave;
668
669 if (!ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) {
670 client_info->ntt = 1;
671 bond->alb_info.rx_ntt = 1;
672 } else {
673 client_info->ntt = 0;
674 }
675
676 if (bond_vlan_used(bond)) {
677 if (!vlan_get_tag(skb, &client_info->vlan_id))
678 client_info->tag = 1;
679 }
680
681 if (!client_info->assigned) {
682 u32 prev_tbl_head = bond_info->rx_hashtbl_head;
683 bond_info->rx_hashtbl_head = hash_index;
684 client_info->next = prev_tbl_head;
685 if (prev_tbl_head != RLB_NULL_INDEX) {
686 bond_info->rx_hashtbl[prev_tbl_head].prev =
687 hash_index;
688 }
689 client_info->assigned = 1;
690 }
691 }
692
693 _unlock_rx_hashtbl(bond);
694
695 return assigned_slave;
696}
697
698/* chooses (and returns) transmit channel for arp reply
699 * does not choose channel for other arp types since they are
700 * sent on the curr_active_slave
701 */
702static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond)
703{
704 struct arp_pkt *arp = arp_pkt(skb);
705 struct slave *tx_slave = NULL;
706
707 if (arp->op_code == htons(ARPOP_REPLY)) {
708 /* the arp must be sent on the selected
709 * rx channel
710 */
711 tx_slave = rlb_choose_channel(skb, bond);
712 if (tx_slave) {
713 memcpy(arp->mac_src,tx_slave->dev->dev_addr, ETH_ALEN);
714 }
715 pr_debug("Server sent ARP Reply packet\n");
716 } else if (arp->op_code == htons(ARPOP_REQUEST)) {
717 /* Create an entry in the rx_hashtbl for this client as a
718 * place holder.
719 * When the arp reply is received the entry will be updated
720 * with the correct unicast address of the client.
721 */
722 rlb_choose_channel(skb, bond);
723
724 /* The ARP reply packets must be delayed so that
725 * they can cancel out the influence of the ARP request.
726 */
727 bond->alb_info.rlb_update_delay_counter = RLB_UPDATE_DELAY;
728
729 /* arp requests are broadcast and are sent on the primary
730 * the arp request will collapse all clients on the subnet to
731 * the primary slave. We must register these clients to be
732 * updated with their assigned mac.
733 */
734 rlb_req_update_subnet_clients(bond, arp->ip_src);
735 pr_debug("Server sent ARP Request packet\n");
736 }
737
738 return tx_slave;
739}
740
741/* Caller must hold bond lock for read */
742static void rlb_rebalance(struct bonding *bond)
743{
744 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
745 struct slave *assigned_slave;
746 struct rlb_client_info *client_info;
747 int ntt;
748 u32 hash_index;
749
750 _lock_rx_hashtbl_bh(bond);
751
752 ntt = 0;
753 hash_index = bond_info->rx_hashtbl_head;
754 for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) {
755 client_info = &(bond_info->rx_hashtbl[hash_index]);
756 assigned_slave = rlb_next_rx_slave(bond);
757 if (assigned_slave && (client_info->slave != assigned_slave)) {
758 client_info->slave = assigned_slave;
759 client_info->ntt = 1;
760 ntt = 1;
761 }
762 }
763
764 /* update the team's flag only after the whole iteration */
765 if (ntt) {
766 bond_info->rx_ntt = 1;
767 }
768 _unlock_rx_hashtbl_bh(bond);
769}
770
771/* Caller must hold rx_hashtbl lock */
772static void rlb_init_table_entry(struct rlb_client_info *entry)
773{
774 memset(entry, 0, sizeof(struct rlb_client_info));
775 entry->next = RLB_NULL_INDEX;
776 entry->prev = RLB_NULL_INDEX;
777}
778
779static int rlb_initialize(struct bonding *bond)
780{
781 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
782 struct rlb_client_info *new_hashtbl;
783 int size = RLB_HASH_TABLE_SIZE * sizeof(struct rlb_client_info);
784 int i;
785
786 new_hashtbl = kmalloc(size, GFP_KERNEL);
787 if (!new_hashtbl)
788 return -1;
789
790 _lock_rx_hashtbl_bh(bond);
791
792 bond_info->rx_hashtbl = new_hashtbl;
793
794 bond_info->rx_hashtbl_head = RLB_NULL_INDEX;
795
796 for (i = 0; i < RLB_HASH_TABLE_SIZE; i++) {
797 rlb_init_table_entry(bond_info->rx_hashtbl + i);
798 }
799
800 _unlock_rx_hashtbl_bh(bond);
801
802 /* register to receive ARPs */
803 bond->recv_probe = rlb_arp_recv;
804
805 return 0;
806}
807
808static void rlb_deinitialize(struct bonding *bond)
809{
810 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
811
812 _lock_rx_hashtbl_bh(bond);
813
814 kfree(bond_info->rx_hashtbl);
815 bond_info->rx_hashtbl = NULL;
816 bond_info->rx_hashtbl_head = RLB_NULL_INDEX;
817
818 _unlock_rx_hashtbl_bh(bond);
819}
820
821static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
822{
823 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
824 u32 curr_index;
825
826 _lock_rx_hashtbl_bh(bond);
827
828 curr_index = bond_info->rx_hashtbl_head;
829 while (curr_index != RLB_NULL_INDEX) {
830 struct rlb_client_info *curr = &(bond_info->rx_hashtbl[curr_index]);
831 u32 next_index = bond_info->rx_hashtbl[curr_index].next;
832 u32 prev_index = bond_info->rx_hashtbl[curr_index].prev;
833
834 if (curr->tag && (curr->vlan_id == vlan_id)) {
835 if (curr_index == bond_info->rx_hashtbl_head) {
836 bond_info->rx_hashtbl_head = next_index;
837 }
838 if (prev_index != RLB_NULL_INDEX) {
839 bond_info->rx_hashtbl[prev_index].next = next_index;
840 }
841 if (next_index != RLB_NULL_INDEX) {
842 bond_info->rx_hashtbl[next_index].prev = prev_index;
843 }
844
845 rlb_init_table_entry(curr);
846 }
847
848 curr_index = next_index;
849 }
850
851 _unlock_rx_hashtbl_bh(bond);
852}
853
854/*********************** tlb/rlb shared functions *********************/
855
856static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[])
857{
858 struct bonding *bond = bond_get_bond_by_slave(slave);
859 struct learning_pkt pkt;
860 int size = sizeof(struct learning_pkt);
861 int i;
862
863 memset(&pkt, 0, size);
864 memcpy(pkt.mac_dst, mac_addr, ETH_ALEN);
865 memcpy(pkt.mac_src, mac_addr, ETH_ALEN);
866 pkt.type = cpu_to_be16(ETH_P_LOOP);
867
868 for (i = 0; i < MAX_LP_BURST; i++) {
869 struct sk_buff *skb;
870 char *data;
871
872 skb = dev_alloc_skb(size);
873 if (!skb) {
874 return;
875 }
876
877 data = skb_put(skb, size);
878 memcpy(data, &pkt, size);
879
880 skb_reset_mac_header(skb);
881 skb->network_header = skb->mac_header + ETH_HLEN;
882 skb->protocol = pkt.type;
883 skb->priority = TC_PRIO_CONTROL;
884 skb->dev = slave->dev;
885
886 if (bond_vlan_used(bond)) {
887 struct vlan_entry *vlan;
888
889 vlan = bond_next_vlan(bond,
890 bond->alb_info.current_alb_vlan);
891
892 bond->alb_info.current_alb_vlan = vlan;
893 if (!vlan) {
894 kfree_skb(skb);
895 continue;
896 }
897
898 skb = vlan_put_tag(skb, vlan->vlan_id);
899 if (!skb) {
900 pr_err("%s: Error: failed to insert VLAN tag\n",
901 bond->dev->name);
902 continue;
903 }
904 }
905
906 dev_queue_xmit(skb);
907 }
908}
909
910static int alb_set_slave_mac_addr(struct slave *slave, u8 addr[])
911{
912 struct net_device *dev = slave->dev;
913 struct sockaddr s_addr;
914
915 if (slave->bond->params.mode == BOND_MODE_TLB) {
916 memcpy(dev->dev_addr, addr, dev->addr_len);
917 return 0;
918 }
919
920 /* for rlb each slave must have a unique hw mac addresses so that */
921 /* each slave will receive packets destined to a different mac */
922 memcpy(s_addr.sa_data, addr, dev->addr_len);
923 s_addr.sa_family = dev->type;
924 if (dev_set_mac_address(dev, &s_addr)) {
925 pr_err("%s: Error: dev_set_mac_address of dev %s failed!\n"
926 "ALB mode requires that the base driver support setting the hw address also when the network device's interface is open\n",
927 dev->master->name, dev->name);
928 return -EOPNOTSUPP;
929 }
930 return 0;
931}
932
933/*
934 * Swap MAC addresses between two slaves.
935 *
936 * Called with RTNL held, and no other locks.
937 *
938 */
939
940static void alb_swap_mac_addr(struct bonding *bond, struct slave *slave1, struct slave *slave2)
941{
942 u8 tmp_mac_addr[ETH_ALEN];
943
944 memcpy(tmp_mac_addr, slave1->dev->dev_addr, ETH_ALEN);
945 alb_set_slave_mac_addr(slave1, slave2->dev->dev_addr);
946 alb_set_slave_mac_addr(slave2, tmp_mac_addr);
947
948}
949
950/*
951 * Send learning packets after MAC address swap.
952 *
953 * Called with RTNL and no other locks
954 */
955static void alb_fasten_mac_swap(struct bonding *bond, struct slave *slave1,
956 struct slave *slave2)
957{
958 int slaves_state_differ = (SLAVE_IS_OK(slave1) != SLAVE_IS_OK(slave2));
959 struct slave *disabled_slave = NULL;
960
961 ASSERT_RTNL();
962
963 /* fasten the change in the switch */
964 if (SLAVE_IS_OK(slave1)) {
965 alb_send_learning_packets(slave1, slave1->dev->dev_addr);
966 if (bond->alb_info.rlb_enabled) {
967 /* inform the clients that the mac address
968 * has changed
969 */
970 rlb_req_update_slave_clients(bond, slave1);
971 }
972 } else {
973 disabled_slave = slave1;
974 }
975
976 if (SLAVE_IS_OK(slave2)) {
977 alb_send_learning_packets(slave2, slave2->dev->dev_addr);
978 if (bond->alb_info.rlb_enabled) {
979 /* inform the clients that the mac address
980 * has changed
981 */
982 rlb_req_update_slave_clients(bond, slave2);
983 }
984 } else {
985 disabled_slave = slave2;
986 }
987
988 if (bond->alb_info.rlb_enabled && slaves_state_differ) {
989 /* A disabled slave was assigned an active mac addr */
990 rlb_teach_disabled_mac_on_primary(bond,
991 disabled_slave->dev->dev_addr);
992 }
993}
994
995/**
996 * alb_change_hw_addr_on_detach
997 * @bond: bonding we're working on
998 * @slave: the slave that was just detached
999 *
1000 * We assume that @slave was already detached from the slave list.
1001 *
1002 * If @slave's permanent hw address is different both from its current
1003 * address and from @bond's address, then somewhere in the bond there's
1004 * a slave that has @slave's permanet address as its current address.
1005 * We'll make sure that that slave no longer uses @slave's permanent address.
1006 *
1007 * Caller must hold RTNL and no other locks
1008 */
1009static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *slave)
1010{
1011 int perm_curr_diff;
1012 int perm_bond_diff;
1013
1014 perm_curr_diff = !ether_addr_equal_64bits(slave->perm_hwaddr,
1015 slave->dev->dev_addr);
1016 perm_bond_diff = !ether_addr_equal_64bits(slave->perm_hwaddr,
1017 bond->dev->dev_addr);
1018
1019 if (perm_curr_diff && perm_bond_diff) {
1020 struct slave *tmp_slave;
1021 int i, found = 0;
1022
1023 bond_for_each_slave(bond, tmp_slave, i) {
1024 if (ether_addr_equal_64bits(slave->perm_hwaddr,
1025 tmp_slave->dev->dev_addr)) {
1026 found = 1;
1027 break;
1028 }
1029 }
1030
1031 if (found) {
1032 /* locking: needs RTNL and nothing else */
1033 alb_swap_mac_addr(bond, slave, tmp_slave);
1034 alb_fasten_mac_swap(bond, slave, tmp_slave);
1035 }
1036 }
1037}
1038
1039/**
1040 * alb_handle_addr_collision_on_attach
1041 * @bond: bonding we're working on
1042 * @slave: the slave that was just attached
1043 *
1044 * checks uniqueness of slave's mac address and handles the case the
1045 * new slave uses the bonds mac address.
1046 *
1047 * If the permanent hw address of @slave is @bond's hw address, we need to
1048 * find a different hw address to give @slave, that isn't in use by any other
1049 * slave in the bond. This address must be, of course, one of the permanent
1050 * addresses of the other slaves.
1051 *
1052 * We go over the slave list, and for each slave there we compare its
1053 * permanent hw address with the current address of all the other slaves.
1054 * If no match was found, then we've found a slave with a permanent address
1055 * that isn't used by any other slave in the bond, so we can assign it to
1056 * @slave.
1057 *
1058 * assumption: this function is called before @slave is attached to the
1059 * bond slave list.
1060 *
1061 * caller must hold the bond lock for write since the mac addresses are compared
1062 * and may be swapped.
1063 */
1064static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slave *slave)
1065{
1066 struct slave *tmp_slave1, *tmp_slave2, *free_mac_slave;
1067 struct slave *has_bond_addr = bond->curr_active_slave;
1068 int i, j, found = 0;
1069
1070 if (bond->slave_cnt == 0) {
1071 /* this is the first slave */
1072 return 0;
1073 }
1074
1075 /* if slave's mac address differs from bond's mac address
1076 * check uniqueness of slave's mac address against the other
1077 * slaves in the bond.
1078 */
1079 if (!ether_addr_equal_64bits(slave->perm_hwaddr, bond->dev->dev_addr)) {
1080 bond_for_each_slave(bond, tmp_slave1, i) {
1081 if (ether_addr_equal_64bits(tmp_slave1->dev->dev_addr,
1082 slave->dev->dev_addr)) {
1083 found = 1;
1084 break;
1085 }
1086 }
1087
1088 if (!found)
1089 return 0;
1090
1091 /* Try setting slave mac to bond address and fall-through
1092 to code handling that situation below... */
1093 alb_set_slave_mac_addr(slave, bond->dev->dev_addr);
1094 }
1095
1096 /* The slave's address is equal to the address of the bond.
1097 * Search for a spare address in the bond for this slave.
1098 */
1099 free_mac_slave = NULL;
1100
1101 bond_for_each_slave(bond, tmp_slave1, i) {
1102 found = 0;
1103 bond_for_each_slave(bond, tmp_slave2, j) {
1104 if (ether_addr_equal_64bits(tmp_slave1->perm_hwaddr,
1105 tmp_slave2->dev->dev_addr)) {
1106 found = 1;
1107 break;
1108 }
1109 }
1110
1111 if (!found) {
1112 /* no slave has tmp_slave1's perm addr
1113 * as its curr addr
1114 */
1115 free_mac_slave = tmp_slave1;
1116 break;
1117 }
1118
1119 if (!has_bond_addr) {
1120 if (ether_addr_equal_64bits(tmp_slave1->dev->dev_addr,
1121 bond->dev->dev_addr)) {
1122
1123 has_bond_addr = tmp_slave1;
1124 }
1125 }
1126 }
1127
1128 if (free_mac_slave) {
1129 alb_set_slave_mac_addr(slave, free_mac_slave->perm_hwaddr);
1130
1131 pr_warning("%s: Warning: the hw address of slave %s is in use by the bond; giving it the hw address of %s\n",
1132 bond->dev->name, slave->dev->name,
1133 free_mac_slave->dev->name);
1134
1135 } else if (has_bond_addr) {
1136 pr_err("%s: Error: 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",
1137 bond->dev->name, slave->dev->name);
1138 return -EFAULT;
1139 }
1140
1141 return 0;
1142}
1143
1144/**
1145 * alb_set_mac_address
1146 * @bond:
1147 * @addr:
1148 *
1149 * In TLB mode all slaves are configured to the bond's hw address, but set
1150 * their dev_addr field to different addresses (based on their permanent hw
1151 * addresses).
1152 *
1153 * For each slave, this function sets the interface to the new address and then
1154 * changes its dev_addr field to its previous value.
1155 *
1156 * Unwinding assumes bond's mac address has not yet changed.
1157 */
1158static int alb_set_mac_address(struct bonding *bond, void *addr)
1159{
1160 struct sockaddr sa;
1161 struct slave *slave, *stop_at;
1162 char tmp_addr[ETH_ALEN];
1163 int res;
1164 int i;
1165
1166 if (bond->alb_info.rlb_enabled) {
1167 return 0;
1168 }
1169
1170 bond_for_each_slave(bond, slave, i) {
1171 /* save net_device's current hw address */
1172 memcpy(tmp_addr, slave->dev->dev_addr, ETH_ALEN);
1173
1174 res = dev_set_mac_address(slave->dev, addr);
1175
1176 /* restore net_device's hw address */
1177 memcpy(slave->dev->dev_addr, tmp_addr, ETH_ALEN);
1178
1179 if (res)
1180 goto unwind;
1181 }
1182
1183 return 0;
1184
1185unwind:
1186 memcpy(sa.sa_data, bond->dev->dev_addr, bond->dev->addr_len);
1187 sa.sa_family = bond->dev->type;
1188
1189 /* unwind from head to the slave that failed */
1190 stop_at = slave;
1191 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
1192 memcpy(tmp_addr, slave->dev->dev_addr, ETH_ALEN);
1193 dev_set_mac_address(slave->dev, &sa);
1194 memcpy(slave->dev->dev_addr, tmp_addr, ETH_ALEN);
1195 }
1196
1197 return res;
1198}
1199
1200/************************ exported alb funcions ************************/
1201
1202int bond_alb_initialize(struct bonding *bond, int rlb_enabled)
1203{
1204 int res;
1205
1206 res = tlb_initialize(bond);
1207 if (res) {
1208 return res;
1209 }
1210
1211 if (rlb_enabled) {
1212 bond->alb_info.rlb_enabled = 1;
1213 /* initialize rlb */
1214 res = rlb_initialize(bond);
1215 if (res) {
1216 tlb_deinitialize(bond);
1217 return res;
1218 }
1219 } else {
1220 bond->alb_info.rlb_enabled = 0;
1221 }
1222
1223 return 0;
1224}
1225
1226void bond_alb_deinitialize(struct bonding *bond)
1227{
1228 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1229
1230 tlb_deinitialize(bond);
1231
1232 if (bond_info->rlb_enabled) {
1233 rlb_deinitialize(bond);
1234 }
1235}
1236
1237int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
1238{
1239 struct bonding *bond = netdev_priv(bond_dev);
1240 struct ethhdr *eth_data;
1241 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1242 struct slave *tx_slave = NULL;
1243 static const __be32 ip_bcast = htonl(0xffffffff);
1244 int hash_size = 0;
1245 int do_tx_balance = 1;
1246 u32 hash_index = 0;
1247 const u8 *hash_start = NULL;
1248 int res = 1;
1249 struct ipv6hdr *ip6hdr;
1250
1251 skb_reset_mac_header(skb);
1252 eth_data = eth_hdr(skb);
1253
1254 /* make sure that the curr_active_slave do not change during tx
1255 */
1256 read_lock(&bond->curr_slave_lock);
1257
1258 switch (ntohs(skb->protocol)) {
1259 case ETH_P_IP: {
1260 const struct iphdr *iph = ip_hdr(skb);
1261
1262 if (ether_addr_equal_64bits(eth_data->h_dest, mac_bcast) ||
1263 (iph->daddr == ip_bcast) ||
1264 (iph->protocol == IPPROTO_IGMP)) {
1265 do_tx_balance = 0;
1266 break;
1267 }
1268 hash_start = (char *)&(iph->daddr);
1269 hash_size = sizeof(iph->daddr);
1270 }
1271 break;
1272 case ETH_P_IPV6:
1273 /* IPv6 doesn't really use broadcast mac address, but leave
1274 * that here just in case.
1275 */
1276 if (ether_addr_equal_64bits(eth_data->h_dest, mac_bcast)) {
1277 do_tx_balance = 0;
1278 break;
1279 }
1280
1281 /* IPv6 uses all-nodes multicast as an equivalent to
1282 * broadcasts in IPv4.
1283 */
1284 if (ether_addr_equal_64bits(eth_data->h_dest, mac_v6_allmcast)) {
1285 do_tx_balance = 0;
1286 break;
1287 }
1288
1289 /* Additianally, DAD probes should not be tx-balanced as that
1290 * will lead to false positives for duplicate addresses and
1291 * prevent address configuration from working.
1292 */
1293 ip6hdr = ipv6_hdr(skb);
1294 if (ipv6_addr_any(&ip6hdr->saddr)) {
1295 do_tx_balance = 0;
1296 break;
1297 }
1298
1299 hash_start = (char *)&(ipv6_hdr(skb)->daddr);
1300 hash_size = sizeof(ipv6_hdr(skb)->daddr);
1301 break;
1302 case ETH_P_IPX:
1303 if (ipx_hdr(skb)->ipx_checksum != IPX_NO_CHECKSUM) {
1304 /* something is wrong with this packet */
1305 do_tx_balance = 0;
1306 break;
1307 }
1308
1309 if (ipx_hdr(skb)->ipx_type != IPX_TYPE_NCP) {
1310 /* The only protocol worth balancing in
1311 * this family since it has an "ARP" like
1312 * mechanism
1313 */
1314 do_tx_balance = 0;
1315 break;
1316 }
1317
1318 hash_start = (char*)eth_data->h_dest;
1319 hash_size = ETH_ALEN;
1320 break;
1321 case ETH_P_ARP:
1322 do_tx_balance = 0;
1323 if (bond_info->rlb_enabled) {
1324 tx_slave = rlb_arp_xmit(skb, bond);
1325 }
1326 break;
1327 default:
1328 do_tx_balance = 0;
1329 break;
1330 }
1331
1332 if (do_tx_balance) {
1333 hash_index = _simple_hash(hash_start, hash_size);
1334 tx_slave = tlb_choose_channel(bond, hash_index, skb->len);
1335 }
1336
1337 if (!tx_slave) {
1338 /* unbalanced or unassigned, send through primary */
1339 tx_slave = bond->curr_active_slave;
1340 bond_info->unbalanced_load += skb->len;
1341 }
1342
1343 if (tx_slave && SLAVE_IS_OK(tx_slave)) {
1344 if (tx_slave != bond->curr_active_slave) {
1345 memcpy(eth_data->h_source,
1346 tx_slave->dev->dev_addr,
1347 ETH_ALEN);
1348 }
1349
1350 res = bond_dev_queue_xmit(bond, skb, tx_slave->dev);
1351 } else {
1352 if (tx_slave) {
1353 _lock_tx_hashtbl(bond);
1354 __tlb_clear_slave(bond, tx_slave, 0);
1355 _unlock_tx_hashtbl(bond);
1356 }
1357 }
1358
1359 if (res) {
1360 /* no suitable interface, frame not sent */
1361 dev_kfree_skb(skb);
1362 }
1363 read_unlock(&bond->curr_slave_lock);
1364
1365 return NETDEV_TX_OK;
1366}
1367
1368void bond_alb_monitor(struct work_struct *work)
1369{
1370 struct bonding *bond = container_of(work, struct bonding,
1371 alb_work.work);
1372 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1373 struct slave *slave;
1374 int i;
1375
1376 read_lock(&bond->lock);
1377
1378 if (bond->slave_cnt == 0) {
1379 bond_info->tx_rebalance_counter = 0;
1380 bond_info->lp_counter = 0;
1381 goto re_arm;
1382 }
1383
1384 bond_info->tx_rebalance_counter++;
1385 bond_info->lp_counter++;
1386
1387 /* send learning packets */
1388 if (bond_info->lp_counter >= BOND_ALB_LP_TICKS) {
1389 /* change of curr_active_slave involves swapping of mac addresses.
1390 * in order to avoid this swapping from happening while
1391 * sending the learning packets, the curr_slave_lock must be held for
1392 * read.
1393 */
1394 read_lock(&bond->curr_slave_lock);
1395
1396 bond_for_each_slave(bond, slave, i) {
1397 alb_send_learning_packets(slave, slave->dev->dev_addr);
1398 }
1399
1400 read_unlock(&bond->curr_slave_lock);
1401
1402 bond_info->lp_counter = 0;
1403 }
1404
1405 /* rebalance tx traffic */
1406 if (bond_info->tx_rebalance_counter >= BOND_TLB_REBALANCE_TICKS) {
1407
1408 read_lock(&bond->curr_slave_lock);
1409
1410 bond_for_each_slave(bond, slave, i) {
1411 tlb_clear_slave(bond, slave, 1);
1412 if (slave == bond->curr_active_slave) {
1413 SLAVE_TLB_INFO(slave).load =
1414 bond_info->unbalanced_load /
1415 BOND_TLB_REBALANCE_INTERVAL;
1416 bond_info->unbalanced_load = 0;
1417 }
1418 }
1419
1420 read_unlock(&bond->curr_slave_lock);
1421
1422 bond_info->tx_rebalance_counter = 0;
1423 }
1424
1425 /* handle rlb stuff */
1426 if (bond_info->rlb_enabled) {
1427 if (bond_info->primary_is_promisc &&
1428 (++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) {
1429
1430 /*
1431 * dev_set_promiscuity requires rtnl and
1432 * nothing else. Avoid race with bond_close.
1433 */
1434 read_unlock(&bond->lock);
1435 if (!rtnl_trylock()) {
1436 read_lock(&bond->lock);
1437 goto re_arm;
1438 }
1439
1440 bond_info->rlb_promisc_timeout_counter = 0;
1441
1442 /* If the primary was set to promiscuous mode
1443 * because a slave was disabled then
1444 * it can now leave promiscuous mode.
1445 */
1446 dev_set_promiscuity(bond->curr_active_slave->dev, -1);
1447 bond_info->primary_is_promisc = 0;
1448
1449 rtnl_unlock();
1450 read_lock(&bond->lock);
1451 }
1452
1453 if (bond_info->rlb_rebalance) {
1454 bond_info->rlb_rebalance = 0;
1455 rlb_rebalance(bond);
1456 }
1457
1458 /* check if clients need updating */
1459 if (bond_info->rx_ntt) {
1460 if (bond_info->rlb_update_delay_counter) {
1461 --bond_info->rlb_update_delay_counter;
1462 } else {
1463 rlb_update_rx_clients(bond);
1464 if (bond_info->rlb_update_retry_counter) {
1465 --bond_info->rlb_update_retry_counter;
1466 } else {
1467 bond_info->rx_ntt = 0;
1468 }
1469 }
1470 }
1471 }
1472
1473re_arm:
1474 queue_delayed_work(bond->wq, &bond->alb_work, alb_delta_in_ticks);
1475
1476 read_unlock(&bond->lock);
1477}
1478
1479/* assumption: called before the slave is attached to the bond
1480 * and not locked by the bond lock
1481 */
1482int bond_alb_init_slave(struct bonding *bond, struct slave *slave)
1483{
1484 int res;
1485
1486 res = alb_set_slave_mac_addr(slave, slave->perm_hwaddr);
1487 if (res) {
1488 return res;
1489 }
1490
1491 /* caller must hold the bond lock for write since the mac addresses
1492 * are compared and may be swapped.
1493 */
1494 read_lock(&bond->lock);
1495
1496 res = alb_handle_addr_collision_on_attach(bond, slave);
1497
1498 read_unlock(&bond->lock);
1499
1500 if (res) {
1501 return res;
1502 }
1503
1504 tlb_init_slave(slave);
1505
1506 /* order a rebalance ASAP */
1507 bond->alb_info.tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS;
1508
1509 if (bond->alb_info.rlb_enabled) {
1510 bond->alb_info.rlb_rebalance = 1;
1511 }
1512
1513 return 0;
1514}
1515
1516/*
1517 * Remove slave from tlb and rlb hash tables, and fix up MAC addresses
1518 * if necessary.
1519 *
1520 * Caller must hold RTNL and no other locks
1521 */
1522void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave)
1523{
1524 if (bond->slave_cnt > 1) {
1525 alb_change_hw_addr_on_detach(bond, slave);
1526 }
1527
1528 tlb_clear_slave(bond, slave, 0);
1529
1530 if (bond->alb_info.rlb_enabled) {
1531 bond->alb_info.next_rx_slave = NULL;
1532 rlb_clear_slave(bond, slave);
1533 }
1534}
1535
1536/* Caller must hold bond lock for read */
1537void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link)
1538{
1539 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1540
1541 if (link == BOND_LINK_DOWN) {
1542 tlb_clear_slave(bond, slave, 0);
1543 if (bond->alb_info.rlb_enabled) {
1544 rlb_clear_slave(bond, slave);
1545 }
1546 } else if (link == BOND_LINK_UP) {
1547 /* order a rebalance ASAP */
1548 bond_info->tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS;
1549 if (bond->alb_info.rlb_enabled) {
1550 bond->alb_info.rlb_rebalance = 1;
1551 /* If the updelay module parameter is smaller than the
1552 * forwarding delay of the switch the rebalance will
1553 * not work because the rebalance arp replies will
1554 * not be forwarded to the clients..
1555 */
1556 }
1557 }
1558}
1559
1560/**
1561 * bond_alb_handle_active_change - assign new curr_active_slave
1562 * @bond: our bonding struct
1563 * @new_slave: new slave to assign
1564 *
1565 * Set the bond->curr_active_slave to @new_slave and handle
1566 * mac address swapping and promiscuity changes as needed.
1567 *
1568 * If new_slave is NULL, caller must hold curr_slave_lock or
1569 * bond->lock for write.
1570 *
1571 * If new_slave is not NULL, caller must hold RTNL, bond->lock for
1572 * read and curr_slave_lock for write. Processing here may sleep, so
1573 * no other locks may be held.
1574 */
1575void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave)
1576 __releases(&bond->curr_slave_lock)
1577 __releases(&bond->lock)
1578 __acquires(&bond->lock)
1579 __acquires(&bond->curr_slave_lock)
1580{
1581 struct slave *swap_slave;
1582 int i;
1583
1584 if (bond->curr_active_slave == new_slave) {
1585 return;
1586 }
1587
1588 if (bond->curr_active_slave && bond->alb_info.primary_is_promisc) {
1589 dev_set_promiscuity(bond->curr_active_slave->dev, -1);
1590 bond->alb_info.primary_is_promisc = 0;
1591 bond->alb_info.rlb_promisc_timeout_counter = 0;
1592 }
1593
1594 swap_slave = bond->curr_active_slave;
1595 bond->curr_active_slave = new_slave;
1596
1597 if (!new_slave || (bond->slave_cnt == 0)) {
1598 return;
1599 }
1600
1601 /* set the new curr_active_slave to the bonds mac address
1602 * i.e. swap mac addresses of old curr_active_slave and new curr_active_slave
1603 */
1604 if (!swap_slave) {
1605 struct slave *tmp_slave;
1606 /* find slave that is holding the bond's mac address */
1607 bond_for_each_slave(bond, tmp_slave, i) {
1608 if (ether_addr_equal_64bits(tmp_slave->dev->dev_addr,
1609 bond->dev->dev_addr)) {
1610 swap_slave = tmp_slave;
1611 break;
1612 }
1613 }
1614 }
1615
1616 /*
1617 * Arrange for swap_slave and new_slave to temporarily be
1618 * ignored so we can mess with their MAC addresses without
1619 * fear of interference from transmit activity.
1620 */
1621 if (swap_slave) {
1622 tlb_clear_slave(bond, swap_slave, 1);
1623 }
1624 tlb_clear_slave(bond, new_slave, 1);
1625
1626 write_unlock_bh(&bond->curr_slave_lock);
1627 read_unlock(&bond->lock);
1628
1629 ASSERT_RTNL();
1630
1631 /* curr_active_slave must be set before calling alb_swap_mac_addr */
1632 if (swap_slave) {
1633 /* swap mac address */
1634 alb_swap_mac_addr(bond, swap_slave, new_slave);
1635 } else {
1636 /* set the new_slave to the bond mac address */
1637 alb_set_slave_mac_addr(new_slave, bond->dev->dev_addr);
1638 }
1639
1640 if (swap_slave) {
1641 alb_fasten_mac_swap(bond, swap_slave, new_slave);
1642 read_lock(&bond->lock);
1643 } else {
1644 read_lock(&bond->lock);
1645 alb_send_learning_packets(new_slave, bond->dev->dev_addr);
1646 }
1647
1648 write_lock_bh(&bond->curr_slave_lock);
1649}
1650
1651/*
1652 * Called with RTNL
1653 */
1654int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr)
1655 __acquires(&bond->lock)
1656 __releases(&bond->lock)
1657{
1658 struct bonding *bond = netdev_priv(bond_dev);
1659 struct sockaddr *sa = addr;
1660 struct slave *slave, *swap_slave;
1661 int res;
1662 int i;
1663
1664 if (!is_valid_ether_addr(sa->sa_data)) {
1665 return -EADDRNOTAVAIL;
1666 }
1667
1668 res = alb_set_mac_address(bond, addr);
1669 if (res) {
1670 return res;
1671 }
1672
1673 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
1674
1675 /* If there is no curr_active_slave there is nothing else to do.
1676 * Otherwise we'll need to pass the new address to it and handle
1677 * duplications.
1678 */
1679 if (!bond->curr_active_slave) {
1680 return 0;
1681 }
1682
1683 swap_slave = NULL;
1684
1685 bond_for_each_slave(bond, slave, i) {
1686 if (ether_addr_equal_64bits(slave->dev->dev_addr,
1687 bond_dev->dev_addr)) {
1688 swap_slave = slave;
1689 break;
1690 }
1691 }
1692
1693 if (swap_slave) {
1694 alb_swap_mac_addr(bond, swap_slave, bond->curr_active_slave);
1695 alb_fasten_mac_swap(bond, swap_slave, bond->curr_active_slave);
1696 } else {
1697 alb_set_slave_mac_addr(bond->curr_active_slave, bond_dev->dev_addr);
1698
1699 read_lock(&bond->lock);
1700 alb_send_learning_packets(bond->curr_active_slave, bond_dev->dev_addr);
1701 if (bond->alb_info.rlb_enabled) {
1702 /* inform clients mac address has changed */
1703 rlb_req_update_slave_clients(bond, bond->curr_active_slave);
1704 }
1705 read_unlock(&bond->lock);
1706 }
1707
1708 return 0;
1709}
1710
1711void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
1712{
1713 if (bond->alb_info.current_alb_vlan &&
1714 (bond->alb_info.current_alb_vlan->vlan_id == vlan_id)) {
1715 bond->alb_info.current_alb_vlan = NULL;
1716 }
1717
1718 if (bond->alb_info.rlb_enabled) {
1719 rlb_clear_vlan(bond, vlan_id);
1720 }
1721}
1722