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Merge branch 'for-4.7-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj...
[deliverable/linux.git] / drivers / net / bonding / bond_alb.c
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, see <http://www.gnu.org/licenses/>.
16 *
17 * The full GNU General Public License is included in this distribution in the
18 * file called LICENSE.
19 *
20 */
21
22 #include <linux/skbuff.h>
23 #include <linux/netdevice.h>
24 #include <linux/etherdevice.h>
25 #include <linux/pkt_sched.h>
26 #include <linux/spinlock.h>
27 #include <linux/slab.h>
28 #include <linux/timer.h>
29 #include <linux/ip.h>
30 #include <linux/ipv6.h>
31 #include <linux/if_arp.h>
32 #include <linux/if_ether.h>
33 #include <linux/if_bonding.h>
34 #include <linux/if_vlan.h>
35 #include <linux/in.h>
36 #include <net/ipx.h>
37 #include <net/arp.h>
38 #include <net/ipv6.h>
39 #include <asm/byteorder.h>
40 #include <net/bonding.h>
41 #include <net/bond_alb.h>
42
43
44
45 static const u8 mac_bcast[ETH_ALEN + 2] __long_aligned = {
46 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
47 };
48 static const u8 mac_v6_allmcast[ETH_ALEN + 2] __long_aligned = {
49 0x33, 0x33, 0x00, 0x00, 0x00, 0x01
50 };
51 static const int alb_delta_in_ticks = HZ / ALB_TIMER_TICKS_PER_SEC;
52
53 #pragma pack(1)
54 struct learning_pkt {
55 u8 mac_dst[ETH_ALEN];
56 u8 mac_src[ETH_ALEN];
57 __be16 type;
58 u8 padding[ETH_ZLEN - ETH_HLEN];
59 };
60
61 struct arp_pkt {
62 __be16 hw_addr_space;
63 __be16 prot_addr_space;
64 u8 hw_addr_len;
65 u8 prot_addr_len;
66 __be16 op_code;
67 u8 mac_src[ETH_ALEN]; /* sender hardware address */
68 __be32 ip_src; /* sender IP address */
69 u8 mac_dst[ETH_ALEN]; /* target hardware address */
70 __be32 ip_dst; /* target IP address */
71 };
72 #pragma pack()
73
74 static inline struct arp_pkt *arp_pkt(const struct sk_buff *skb)
75 {
76 return (struct arp_pkt *)skb_network_header(skb);
77 }
78
79 /* Forward declaration */
80 static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[],
81 bool strict_match);
82 static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp);
83 static void rlb_src_unlink(struct bonding *bond, u32 index);
84 static void rlb_src_link(struct bonding *bond, u32 ip_src_hash,
85 u32 ip_dst_hash);
86
87 static inline u8 _simple_hash(const u8 *hash_start, int hash_size)
88 {
89 int i;
90 u8 hash = 0;
91
92 for (i = 0; i < hash_size; i++)
93 hash ^= hash_start[i];
94
95 return hash;
96 }
97
98 /*********************** tlb specific functions ***************************/
99
100 static inline void tlb_init_table_entry(struct tlb_client_info *entry, int save_load)
101 {
102 if (save_load) {
103 entry->load_history = 1 + entry->tx_bytes /
104 BOND_TLB_REBALANCE_INTERVAL;
105 entry->tx_bytes = 0;
106 }
107
108 entry->tx_slave = NULL;
109 entry->next = TLB_NULL_INDEX;
110 entry->prev = TLB_NULL_INDEX;
111 }
112
113 static inline void tlb_init_slave(struct slave *slave)
114 {
115 SLAVE_TLB_INFO(slave).load = 0;
116 SLAVE_TLB_INFO(slave).head = TLB_NULL_INDEX;
117 }
118
119 static void __tlb_clear_slave(struct bonding *bond, struct slave *slave,
120 int save_load)
121 {
122 struct tlb_client_info *tx_hash_table;
123 u32 index;
124
125 /* clear slave from tx_hashtbl */
126 tx_hash_table = BOND_ALB_INFO(bond).tx_hashtbl;
127
128 /* skip this if we've already freed the tx hash table */
129 if (tx_hash_table) {
130 index = SLAVE_TLB_INFO(slave).head;
131 while (index != TLB_NULL_INDEX) {
132 u32 next_index = tx_hash_table[index].next;
133 tlb_init_table_entry(&tx_hash_table[index], save_load);
134 index = next_index;
135 }
136 }
137
138 tlb_init_slave(slave);
139 }
140
141 static void tlb_clear_slave(struct bonding *bond, struct slave *slave,
142 int save_load)
143 {
144 spin_lock_bh(&bond->mode_lock);
145 __tlb_clear_slave(bond, slave, save_load);
146 spin_unlock_bh(&bond->mode_lock);
147 }
148
149 /* Must be called before starting the monitor timer */
150 static int tlb_initialize(struct bonding *bond)
151 {
152 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
153 int size = TLB_HASH_TABLE_SIZE * sizeof(struct tlb_client_info);
154 struct tlb_client_info *new_hashtbl;
155 int i;
156
157 new_hashtbl = kzalloc(size, GFP_KERNEL);
158 if (!new_hashtbl)
159 return -ENOMEM;
160
161 spin_lock_bh(&bond->mode_lock);
162
163 bond_info->tx_hashtbl = new_hashtbl;
164
165 for (i = 0; i < TLB_HASH_TABLE_SIZE; i++)
166 tlb_init_table_entry(&bond_info->tx_hashtbl[i], 0);
167
168 spin_unlock_bh(&bond->mode_lock);
169
170 return 0;
171 }
172
173 /* Must be called only after all slaves have been released */
174 static void tlb_deinitialize(struct bonding *bond)
175 {
176 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
177
178 spin_lock_bh(&bond->mode_lock);
179
180 kfree(bond_info->tx_hashtbl);
181 bond_info->tx_hashtbl = NULL;
182
183 spin_unlock_bh(&bond->mode_lock);
184 }
185
186 static long long compute_gap(struct slave *slave)
187 {
188 return (s64) (slave->speed << 20) - /* Convert to Megabit per sec */
189 (s64) (SLAVE_TLB_INFO(slave).load << 3); /* Bytes to bits */
190 }
191
192 static struct slave *tlb_get_least_loaded_slave(struct bonding *bond)
193 {
194 struct slave *slave, *least_loaded;
195 struct list_head *iter;
196 long long max_gap;
197
198 least_loaded = NULL;
199 max_gap = LLONG_MIN;
200
201 /* Find the slave with the largest gap */
202 bond_for_each_slave_rcu(bond, slave, iter) {
203 if (bond_slave_can_tx(slave)) {
204 long long gap = compute_gap(slave);
205
206 if (max_gap < gap) {
207 least_loaded = slave;
208 max_gap = gap;
209 }
210 }
211 }
212
213 return least_loaded;
214 }
215
216 static struct slave *__tlb_choose_channel(struct bonding *bond, u32 hash_index,
217 u32 skb_len)
218 {
219 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
220 struct tlb_client_info *hash_table;
221 struct slave *assigned_slave;
222
223 hash_table = bond_info->tx_hashtbl;
224 assigned_slave = hash_table[hash_index].tx_slave;
225 if (!assigned_slave) {
226 assigned_slave = tlb_get_least_loaded_slave(bond);
227
228 if (assigned_slave) {
229 struct tlb_slave_info *slave_info =
230 &(SLAVE_TLB_INFO(assigned_slave));
231 u32 next_index = slave_info->head;
232
233 hash_table[hash_index].tx_slave = assigned_slave;
234 hash_table[hash_index].next = next_index;
235 hash_table[hash_index].prev = TLB_NULL_INDEX;
236
237 if (next_index != TLB_NULL_INDEX)
238 hash_table[next_index].prev = hash_index;
239
240 slave_info->head = hash_index;
241 slave_info->load +=
242 hash_table[hash_index].load_history;
243 }
244 }
245
246 if (assigned_slave)
247 hash_table[hash_index].tx_bytes += skb_len;
248
249 return assigned_slave;
250 }
251
252 static struct slave *tlb_choose_channel(struct bonding *bond, u32 hash_index,
253 u32 skb_len)
254 {
255 struct slave *tx_slave;
256
257 /* We don't need to disable softirq here, becase
258 * tlb_choose_channel() is only called by bond_alb_xmit()
259 * which already has softirq disabled.
260 */
261 spin_lock(&bond->mode_lock);
262 tx_slave = __tlb_choose_channel(bond, hash_index, skb_len);
263 spin_unlock(&bond->mode_lock);
264
265 return tx_slave;
266 }
267
268 /*********************** rlb specific functions ***************************/
269
270 /* when an ARP REPLY is received from a client update its info
271 * in the rx_hashtbl
272 */
273 static void rlb_update_entry_from_arp(struct bonding *bond, struct arp_pkt *arp)
274 {
275 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
276 struct rlb_client_info *client_info;
277 u32 hash_index;
278
279 spin_lock_bh(&bond->mode_lock);
280
281 hash_index = _simple_hash((u8 *)&(arp->ip_src), sizeof(arp->ip_src));
282 client_info = &(bond_info->rx_hashtbl[hash_index]);
283
284 if ((client_info->assigned) &&
285 (client_info->ip_src == arp->ip_dst) &&
286 (client_info->ip_dst == arp->ip_src) &&
287 (!ether_addr_equal_64bits(client_info->mac_dst, arp->mac_src))) {
288 /* update the clients MAC address */
289 ether_addr_copy(client_info->mac_dst, arp->mac_src);
290 client_info->ntt = 1;
291 bond_info->rx_ntt = 1;
292 }
293
294 spin_unlock_bh(&bond->mode_lock);
295 }
296
297 static int rlb_arp_recv(const struct sk_buff *skb, struct bonding *bond,
298 struct slave *slave)
299 {
300 struct arp_pkt *arp, _arp;
301
302 if (skb->protocol != cpu_to_be16(ETH_P_ARP))
303 goto out;
304
305 arp = skb_header_pointer(skb, 0, sizeof(_arp), &_arp);
306 if (!arp)
307 goto out;
308
309 /* We received an ARP from arp->ip_src.
310 * We might have used this IP address previously (on the bonding host
311 * itself or on a system that is bridged together with the bond).
312 * However, if arp->mac_src is different than what is stored in
313 * rx_hashtbl, some other host is now using the IP and we must prevent
314 * sending out client updates with this IP address and the old MAC
315 * address.
316 * Clean up all hash table entries that have this address as ip_src but
317 * have a different mac_src.
318 */
319 rlb_purge_src_ip(bond, arp);
320
321 if (arp->op_code == htons(ARPOP_REPLY)) {
322 /* update rx hash table for this ARP */
323 rlb_update_entry_from_arp(bond, arp);
324 netdev_dbg(bond->dev, "Server received an ARP Reply from client\n");
325 }
326 out:
327 return RX_HANDLER_ANOTHER;
328 }
329
330 /* Caller must hold rcu_read_lock() */
331 static struct slave *__rlb_next_rx_slave(struct bonding *bond)
332 {
333 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
334 struct slave *before = NULL, *rx_slave = NULL, *slave;
335 struct list_head *iter;
336 bool found = false;
337
338 bond_for_each_slave_rcu(bond, slave, iter) {
339 if (!bond_slave_can_tx(slave))
340 continue;
341 if (!found) {
342 if (!before || before->speed < slave->speed)
343 before = slave;
344 } else {
345 if (!rx_slave || rx_slave->speed < slave->speed)
346 rx_slave = slave;
347 }
348 if (slave == bond_info->rx_slave)
349 found = true;
350 }
351 /* we didn't find anything after the current or we have something
352 * better before and up to the current slave
353 */
354 if (!rx_slave || (before && rx_slave->speed < before->speed))
355 rx_slave = before;
356
357 if (rx_slave)
358 bond_info->rx_slave = rx_slave;
359
360 return rx_slave;
361 }
362
363 /* Caller must hold RTNL, rcu_read_lock is obtained only to silence checkers */
364 static struct slave *rlb_next_rx_slave(struct bonding *bond)
365 {
366 struct slave *rx_slave;
367
368 ASSERT_RTNL();
369
370 rcu_read_lock();
371 rx_slave = __rlb_next_rx_slave(bond);
372 rcu_read_unlock();
373
374 return rx_slave;
375 }
376
377 /* teach the switch the mac of a disabled slave
378 * on the primary for fault tolerance
379 *
380 * Caller must hold RTNL
381 */
382 static void rlb_teach_disabled_mac_on_primary(struct bonding *bond, u8 addr[])
383 {
384 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
385
386 if (!curr_active)
387 return;
388
389 if (!bond->alb_info.primary_is_promisc) {
390 if (!dev_set_promiscuity(curr_active->dev, 1))
391 bond->alb_info.primary_is_promisc = 1;
392 else
393 bond->alb_info.primary_is_promisc = 0;
394 }
395
396 bond->alb_info.rlb_promisc_timeout_counter = 0;
397
398 alb_send_learning_packets(curr_active, addr, true);
399 }
400
401 /* slave being removed should not be active at this point
402 *
403 * Caller must hold rtnl.
404 */
405 static void rlb_clear_slave(struct bonding *bond, struct slave *slave)
406 {
407 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
408 struct rlb_client_info *rx_hash_table;
409 u32 index, next_index;
410
411 /* clear slave from rx_hashtbl */
412 spin_lock_bh(&bond->mode_lock);
413
414 rx_hash_table = bond_info->rx_hashtbl;
415 index = bond_info->rx_hashtbl_used_head;
416 for (; index != RLB_NULL_INDEX; index = next_index) {
417 next_index = rx_hash_table[index].used_next;
418 if (rx_hash_table[index].slave == slave) {
419 struct slave *assigned_slave = rlb_next_rx_slave(bond);
420
421 if (assigned_slave) {
422 rx_hash_table[index].slave = assigned_slave;
423 if (!ether_addr_equal_64bits(rx_hash_table[index].mac_dst,
424 mac_bcast)) {
425 bond_info->rx_hashtbl[index].ntt = 1;
426 bond_info->rx_ntt = 1;
427 /* A slave has been removed from the
428 * table because it is either disabled
429 * or being released. We must retry the
430 * update to avoid clients from not
431 * being updated & disconnecting when
432 * there is stress
433 */
434 bond_info->rlb_update_retry_counter =
435 RLB_UPDATE_RETRY;
436 }
437 } else { /* there is no active slave */
438 rx_hash_table[index].slave = NULL;
439 }
440 }
441 }
442
443 spin_unlock_bh(&bond->mode_lock);
444
445 if (slave != rtnl_dereference(bond->curr_active_slave))
446 rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr);
447 }
448
449 static void rlb_update_client(struct rlb_client_info *client_info)
450 {
451 int i;
452
453 if (!client_info->slave)
454 return;
455
456 for (i = 0; i < RLB_ARP_BURST_SIZE; i++) {
457 struct sk_buff *skb;
458
459 skb = arp_create(ARPOP_REPLY, ETH_P_ARP,
460 client_info->ip_dst,
461 client_info->slave->dev,
462 client_info->ip_src,
463 client_info->mac_dst,
464 client_info->slave->dev->dev_addr,
465 client_info->mac_dst);
466 if (!skb) {
467 netdev_err(client_info->slave->bond->dev,
468 "failed to create an ARP packet\n");
469 continue;
470 }
471
472 skb->dev = client_info->slave->dev;
473
474 if (client_info->vlan_id) {
475 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
476 client_info->vlan_id);
477 }
478
479 arp_xmit(skb);
480 }
481 }
482
483 /* sends ARP REPLIES that update the clients that need updating */
484 static void rlb_update_rx_clients(struct bonding *bond)
485 {
486 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
487 struct rlb_client_info *client_info;
488 u32 hash_index;
489
490 spin_lock_bh(&bond->mode_lock);
491
492 hash_index = bond_info->rx_hashtbl_used_head;
493 for (; hash_index != RLB_NULL_INDEX;
494 hash_index = client_info->used_next) {
495 client_info = &(bond_info->rx_hashtbl[hash_index]);
496 if (client_info->ntt) {
497 rlb_update_client(client_info);
498 if (bond_info->rlb_update_retry_counter == 0)
499 client_info->ntt = 0;
500 }
501 }
502
503 /* do not update the entries again until this counter is zero so that
504 * not to confuse the clients.
505 */
506 bond_info->rlb_update_delay_counter = RLB_UPDATE_DELAY;
507
508 spin_unlock_bh(&bond->mode_lock);
509 }
510
511 /* The slave was assigned a new mac address - update the clients */
512 static void rlb_req_update_slave_clients(struct bonding *bond, struct slave *slave)
513 {
514 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
515 struct rlb_client_info *client_info;
516 int ntt = 0;
517 u32 hash_index;
518
519 spin_lock_bh(&bond->mode_lock);
520
521 hash_index = bond_info->rx_hashtbl_used_head;
522 for (; hash_index != RLB_NULL_INDEX;
523 hash_index = client_info->used_next) {
524 client_info = &(bond_info->rx_hashtbl[hash_index]);
525
526 if ((client_info->slave == slave) &&
527 !ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) {
528 client_info->ntt = 1;
529 ntt = 1;
530 }
531 }
532
533 /* update the team's flag only after the whole iteration */
534 if (ntt) {
535 bond_info->rx_ntt = 1;
536 /* fasten the change */
537 bond_info->rlb_update_retry_counter = RLB_UPDATE_RETRY;
538 }
539
540 spin_unlock_bh(&bond->mode_lock);
541 }
542
543 /* mark all clients using src_ip to be updated */
544 static void rlb_req_update_subnet_clients(struct bonding *bond, __be32 src_ip)
545 {
546 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
547 struct rlb_client_info *client_info;
548 u32 hash_index;
549
550 spin_lock(&bond->mode_lock);
551
552 hash_index = bond_info->rx_hashtbl_used_head;
553 for (; hash_index != RLB_NULL_INDEX;
554 hash_index = client_info->used_next) {
555 client_info = &(bond_info->rx_hashtbl[hash_index]);
556
557 if (!client_info->slave) {
558 netdev_err(bond->dev, "found a client with no channel in the client's hash table\n");
559 continue;
560 }
561 /* update all clients using this src_ip, that are not assigned
562 * to the team's address (curr_active_slave) and have a known
563 * unicast mac address.
564 */
565 if ((client_info->ip_src == src_ip) &&
566 !ether_addr_equal_64bits(client_info->slave->dev->dev_addr,
567 bond->dev->dev_addr) &&
568 !ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) {
569 client_info->ntt = 1;
570 bond_info->rx_ntt = 1;
571 }
572 }
573
574 spin_unlock(&bond->mode_lock);
575 }
576
577 static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bond)
578 {
579 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
580 struct arp_pkt *arp = arp_pkt(skb);
581 struct slave *assigned_slave, *curr_active_slave;
582 struct rlb_client_info *client_info;
583 u32 hash_index = 0;
584
585 spin_lock(&bond->mode_lock);
586
587 curr_active_slave = rcu_dereference(bond->curr_active_slave);
588
589 hash_index = _simple_hash((u8 *)&arp->ip_dst, sizeof(arp->ip_dst));
590 client_info = &(bond_info->rx_hashtbl[hash_index]);
591
592 if (client_info->assigned) {
593 if ((client_info->ip_src == arp->ip_src) &&
594 (client_info->ip_dst == arp->ip_dst)) {
595 /* the entry is already assigned to this client */
596 if (!ether_addr_equal_64bits(arp->mac_dst, mac_bcast)) {
597 /* update mac address from arp */
598 ether_addr_copy(client_info->mac_dst, arp->mac_dst);
599 }
600 ether_addr_copy(client_info->mac_src, arp->mac_src);
601
602 assigned_slave = client_info->slave;
603 if (assigned_slave) {
604 spin_unlock(&bond->mode_lock);
605 return assigned_slave;
606 }
607 } else {
608 /* the entry is already assigned to some other client,
609 * move the old client to primary (curr_active_slave) so
610 * that the new client can be assigned to this entry.
611 */
612 if (curr_active_slave &&
613 client_info->slave != curr_active_slave) {
614 client_info->slave = curr_active_slave;
615 rlb_update_client(client_info);
616 }
617 }
618 }
619 /* assign a new slave */
620 assigned_slave = __rlb_next_rx_slave(bond);
621
622 if (assigned_slave) {
623 if (!(client_info->assigned &&
624 client_info->ip_src == arp->ip_src)) {
625 /* ip_src is going to be updated,
626 * fix the src hash list
627 */
628 u32 hash_src = _simple_hash((u8 *)&arp->ip_src,
629 sizeof(arp->ip_src));
630 rlb_src_unlink(bond, hash_index);
631 rlb_src_link(bond, hash_src, hash_index);
632 }
633
634 client_info->ip_src = arp->ip_src;
635 client_info->ip_dst = arp->ip_dst;
636 /* arp->mac_dst is broadcast for arp reqeusts.
637 * will be updated with clients actual unicast mac address
638 * upon receiving an arp reply.
639 */
640 ether_addr_copy(client_info->mac_dst, arp->mac_dst);
641 ether_addr_copy(client_info->mac_src, arp->mac_src);
642 client_info->slave = assigned_slave;
643
644 if (!ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) {
645 client_info->ntt = 1;
646 bond->alb_info.rx_ntt = 1;
647 } else {
648 client_info->ntt = 0;
649 }
650
651 if (vlan_get_tag(skb, &client_info->vlan_id))
652 client_info->vlan_id = 0;
653
654 if (!client_info->assigned) {
655 u32 prev_tbl_head = bond_info->rx_hashtbl_used_head;
656 bond_info->rx_hashtbl_used_head = hash_index;
657 client_info->used_next = prev_tbl_head;
658 if (prev_tbl_head != RLB_NULL_INDEX) {
659 bond_info->rx_hashtbl[prev_tbl_head].used_prev =
660 hash_index;
661 }
662 client_info->assigned = 1;
663 }
664 }
665
666 spin_unlock(&bond->mode_lock);
667
668 return assigned_slave;
669 }
670
671 /* chooses (and returns) transmit channel for arp reply
672 * does not choose channel for other arp types since they are
673 * sent on the curr_active_slave
674 */
675 static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond)
676 {
677 struct arp_pkt *arp = arp_pkt(skb);
678 struct slave *tx_slave = NULL;
679
680 /* Don't modify or load balance ARPs that do not originate locally
681 * (e.g.,arrive via a bridge).
682 */
683 if (!bond_slave_has_mac_rx(bond, arp->mac_src))
684 return NULL;
685
686 if (arp->op_code == htons(ARPOP_REPLY)) {
687 /* the arp must be sent on the selected rx channel */
688 tx_slave = rlb_choose_channel(skb, bond);
689 if (tx_slave)
690 ether_addr_copy(arp->mac_src, tx_slave->dev->dev_addr);
691 netdev_dbg(bond->dev, "Server sent ARP Reply packet\n");
692 } else if (arp->op_code == htons(ARPOP_REQUEST)) {
693 /* Create an entry in the rx_hashtbl for this client as a
694 * place holder.
695 * When the arp reply is received the entry will be updated
696 * with the correct unicast address of the client.
697 */
698 rlb_choose_channel(skb, bond);
699
700 /* The ARP reply packets must be delayed so that
701 * they can cancel out the influence of the ARP request.
702 */
703 bond->alb_info.rlb_update_delay_counter = RLB_UPDATE_DELAY;
704
705 /* arp requests are broadcast and are sent on the primary
706 * the arp request will collapse all clients on the subnet to
707 * the primary slave. We must register these clients to be
708 * updated with their assigned mac.
709 */
710 rlb_req_update_subnet_clients(bond, arp->ip_src);
711 netdev_dbg(bond->dev, "Server sent ARP Request packet\n");
712 }
713
714 return tx_slave;
715 }
716
717 static void rlb_rebalance(struct bonding *bond)
718 {
719 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
720 struct slave *assigned_slave;
721 struct rlb_client_info *client_info;
722 int ntt;
723 u32 hash_index;
724
725 spin_lock_bh(&bond->mode_lock);
726
727 ntt = 0;
728 hash_index = bond_info->rx_hashtbl_used_head;
729 for (; hash_index != RLB_NULL_INDEX;
730 hash_index = client_info->used_next) {
731 client_info = &(bond_info->rx_hashtbl[hash_index]);
732 assigned_slave = __rlb_next_rx_slave(bond);
733 if (assigned_slave && (client_info->slave != assigned_slave)) {
734 client_info->slave = assigned_slave;
735 client_info->ntt = 1;
736 ntt = 1;
737 }
738 }
739
740 /* update the team's flag only after the whole iteration */
741 if (ntt)
742 bond_info->rx_ntt = 1;
743 spin_unlock_bh(&bond->mode_lock);
744 }
745
746 /* Caller must hold mode_lock */
747 static void rlb_init_table_entry_dst(struct rlb_client_info *entry)
748 {
749 entry->used_next = RLB_NULL_INDEX;
750 entry->used_prev = RLB_NULL_INDEX;
751 entry->assigned = 0;
752 entry->slave = NULL;
753 entry->vlan_id = 0;
754 }
755 static void rlb_init_table_entry_src(struct rlb_client_info *entry)
756 {
757 entry->src_first = RLB_NULL_INDEX;
758 entry->src_prev = RLB_NULL_INDEX;
759 entry->src_next = RLB_NULL_INDEX;
760 }
761
762 static void rlb_init_table_entry(struct rlb_client_info *entry)
763 {
764 memset(entry, 0, sizeof(struct rlb_client_info));
765 rlb_init_table_entry_dst(entry);
766 rlb_init_table_entry_src(entry);
767 }
768
769 static void rlb_delete_table_entry_dst(struct bonding *bond, u32 index)
770 {
771 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
772 u32 next_index = bond_info->rx_hashtbl[index].used_next;
773 u32 prev_index = bond_info->rx_hashtbl[index].used_prev;
774
775 if (index == bond_info->rx_hashtbl_used_head)
776 bond_info->rx_hashtbl_used_head = next_index;
777 if (prev_index != RLB_NULL_INDEX)
778 bond_info->rx_hashtbl[prev_index].used_next = next_index;
779 if (next_index != RLB_NULL_INDEX)
780 bond_info->rx_hashtbl[next_index].used_prev = prev_index;
781 }
782
783 /* unlink a rlb hash table entry from the src list */
784 static void rlb_src_unlink(struct bonding *bond, u32 index)
785 {
786 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
787 u32 next_index = bond_info->rx_hashtbl[index].src_next;
788 u32 prev_index = bond_info->rx_hashtbl[index].src_prev;
789
790 bond_info->rx_hashtbl[index].src_next = RLB_NULL_INDEX;
791 bond_info->rx_hashtbl[index].src_prev = RLB_NULL_INDEX;
792
793 if (next_index != RLB_NULL_INDEX)
794 bond_info->rx_hashtbl[next_index].src_prev = prev_index;
795
796 if (prev_index == RLB_NULL_INDEX)
797 return;
798
799 /* is prev_index pointing to the head of this list? */
800 if (bond_info->rx_hashtbl[prev_index].src_first == index)
801 bond_info->rx_hashtbl[prev_index].src_first = next_index;
802 else
803 bond_info->rx_hashtbl[prev_index].src_next = next_index;
804
805 }
806
807 static void rlb_delete_table_entry(struct bonding *bond, u32 index)
808 {
809 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
810 struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]);
811
812 rlb_delete_table_entry_dst(bond, index);
813 rlb_init_table_entry_dst(entry);
814
815 rlb_src_unlink(bond, index);
816 }
817
818 /* add the rx_hashtbl[ip_dst_hash] entry to the list
819 * of entries with identical ip_src_hash
820 */
821 static void rlb_src_link(struct bonding *bond, u32 ip_src_hash, u32 ip_dst_hash)
822 {
823 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
824 u32 next;
825
826 bond_info->rx_hashtbl[ip_dst_hash].src_prev = ip_src_hash;
827 next = bond_info->rx_hashtbl[ip_src_hash].src_first;
828 bond_info->rx_hashtbl[ip_dst_hash].src_next = next;
829 if (next != RLB_NULL_INDEX)
830 bond_info->rx_hashtbl[next].src_prev = ip_dst_hash;
831 bond_info->rx_hashtbl[ip_src_hash].src_first = ip_dst_hash;
832 }
833
834 /* deletes all rx_hashtbl entries with arp->ip_src if their mac_src does
835 * not match arp->mac_src
836 */
837 static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp)
838 {
839 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
840 u32 ip_src_hash = _simple_hash((u8 *)&(arp->ip_src), sizeof(arp->ip_src));
841 u32 index;
842
843 spin_lock_bh(&bond->mode_lock);
844
845 index = bond_info->rx_hashtbl[ip_src_hash].src_first;
846 while (index != RLB_NULL_INDEX) {
847 struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]);
848 u32 next_index = entry->src_next;
849 if (entry->ip_src == arp->ip_src &&
850 !ether_addr_equal_64bits(arp->mac_src, entry->mac_src))
851 rlb_delete_table_entry(bond, index);
852 index = next_index;
853 }
854 spin_unlock_bh(&bond->mode_lock);
855 }
856
857 static int rlb_initialize(struct bonding *bond)
858 {
859 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
860 struct rlb_client_info *new_hashtbl;
861 int size = RLB_HASH_TABLE_SIZE * sizeof(struct rlb_client_info);
862 int i;
863
864 new_hashtbl = kmalloc(size, GFP_KERNEL);
865 if (!new_hashtbl)
866 return -1;
867
868 spin_lock_bh(&bond->mode_lock);
869
870 bond_info->rx_hashtbl = new_hashtbl;
871
872 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
873
874 for (i = 0; i < RLB_HASH_TABLE_SIZE; i++)
875 rlb_init_table_entry(bond_info->rx_hashtbl + i);
876
877 spin_unlock_bh(&bond->mode_lock);
878
879 /* register to receive ARPs */
880 bond->recv_probe = rlb_arp_recv;
881
882 return 0;
883 }
884
885 static void rlb_deinitialize(struct bonding *bond)
886 {
887 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
888
889 spin_lock_bh(&bond->mode_lock);
890
891 kfree(bond_info->rx_hashtbl);
892 bond_info->rx_hashtbl = NULL;
893 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
894
895 spin_unlock_bh(&bond->mode_lock);
896 }
897
898 static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
899 {
900 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
901 u32 curr_index;
902
903 spin_lock_bh(&bond->mode_lock);
904
905 curr_index = bond_info->rx_hashtbl_used_head;
906 while (curr_index != RLB_NULL_INDEX) {
907 struct rlb_client_info *curr = &(bond_info->rx_hashtbl[curr_index]);
908 u32 next_index = bond_info->rx_hashtbl[curr_index].used_next;
909
910 if (curr->vlan_id == vlan_id)
911 rlb_delete_table_entry(bond, curr_index);
912
913 curr_index = next_index;
914 }
915
916 spin_unlock_bh(&bond->mode_lock);
917 }
918
919 /*********************** tlb/rlb shared functions *********************/
920
921 static void alb_send_lp_vid(struct slave *slave, u8 mac_addr[],
922 __be16 vlan_proto, u16 vid)
923 {
924 struct learning_pkt pkt;
925 struct sk_buff *skb;
926 int size = sizeof(struct learning_pkt);
927 char *data;
928
929 memset(&pkt, 0, size);
930 ether_addr_copy(pkt.mac_dst, mac_addr);
931 ether_addr_copy(pkt.mac_src, mac_addr);
932 pkt.type = cpu_to_be16(ETH_P_LOOPBACK);
933
934 skb = dev_alloc_skb(size);
935 if (!skb)
936 return;
937
938 data = skb_put(skb, size);
939 memcpy(data, &pkt, size);
940
941 skb_reset_mac_header(skb);
942 skb->network_header = skb->mac_header + ETH_HLEN;
943 skb->protocol = pkt.type;
944 skb->priority = TC_PRIO_CONTROL;
945 skb->dev = slave->dev;
946
947 if (vid)
948 __vlan_hwaccel_put_tag(skb, vlan_proto, vid);
949
950 dev_queue_xmit(skb);
951 }
952
953 static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[],
954 bool strict_match)
955 {
956 struct bonding *bond = bond_get_bond_by_slave(slave);
957 struct net_device *upper;
958 struct list_head *iter;
959 struct bond_vlan_tag *tags;
960
961 /* send untagged */
962 alb_send_lp_vid(slave, mac_addr, 0, 0);
963
964 /* loop through all devices and see if we need to send a packet
965 * for that device.
966 */
967 rcu_read_lock();
968 netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) {
969 if (is_vlan_dev(upper) && vlan_get_encap_level(upper) == 0) {
970 if (strict_match &&
971 ether_addr_equal_64bits(mac_addr,
972 upper->dev_addr)) {
973 alb_send_lp_vid(slave, mac_addr,
974 vlan_dev_vlan_proto(upper),
975 vlan_dev_vlan_id(upper));
976 } else if (!strict_match) {
977 alb_send_lp_vid(slave, upper->dev_addr,
978 vlan_dev_vlan_proto(upper),
979 vlan_dev_vlan_id(upper));
980 }
981 }
982
983 /* If this is a macvlan device, then only send updates
984 * when strict_match is turned off.
985 */
986 if (netif_is_macvlan(upper) && !strict_match) {
987 tags = bond_verify_device_path(bond->dev, upper, 0);
988 if (IS_ERR_OR_NULL(tags))
989 BUG();
990 alb_send_lp_vid(slave, upper->dev_addr,
991 tags[0].vlan_proto, tags[0].vlan_id);
992 kfree(tags);
993 }
994 }
995 rcu_read_unlock();
996 }
997
998 static int alb_set_slave_mac_addr(struct slave *slave, u8 addr[])
999 {
1000 struct net_device *dev = slave->dev;
1001 struct sockaddr s_addr;
1002
1003 if (BOND_MODE(slave->bond) == BOND_MODE_TLB) {
1004 memcpy(dev->dev_addr, addr, dev->addr_len);
1005 return 0;
1006 }
1007
1008 /* for rlb each slave must have a unique hw mac addresses so that
1009 * each slave will receive packets destined to a different mac
1010 */
1011 memcpy(s_addr.sa_data, addr, dev->addr_len);
1012 s_addr.sa_family = dev->type;
1013 if (dev_set_mac_address(dev, &s_addr)) {
1014 netdev_err(slave->bond->dev, "dev_set_mac_address of dev %s failed! ALB mode requires that the base driver support setting the hw address also when the network device's interface is open\n",
1015 dev->name);
1016 return -EOPNOTSUPP;
1017 }
1018 return 0;
1019 }
1020
1021 /* Swap MAC addresses between two slaves.
1022 *
1023 * Called with RTNL held, and no other locks.
1024 */
1025 static void alb_swap_mac_addr(struct slave *slave1, struct slave *slave2)
1026 {
1027 u8 tmp_mac_addr[ETH_ALEN];
1028
1029 ether_addr_copy(tmp_mac_addr, slave1->dev->dev_addr);
1030 alb_set_slave_mac_addr(slave1, slave2->dev->dev_addr);
1031 alb_set_slave_mac_addr(slave2, tmp_mac_addr);
1032
1033 }
1034
1035 /* Send learning packets after MAC address swap.
1036 *
1037 * Called with RTNL and no other locks
1038 */
1039 static void alb_fasten_mac_swap(struct bonding *bond, struct slave *slave1,
1040 struct slave *slave2)
1041 {
1042 int slaves_state_differ = (bond_slave_can_tx(slave1) != bond_slave_can_tx(slave2));
1043 struct slave *disabled_slave = NULL;
1044
1045 ASSERT_RTNL();
1046
1047 /* fasten the change in the switch */
1048 if (bond_slave_can_tx(slave1)) {
1049 alb_send_learning_packets(slave1, slave1->dev->dev_addr, false);
1050 if (bond->alb_info.rlb_enabled) {
1051 /* inform the clients that the mac address
1052 * has changed
1053 */
1054 rlb_req_update_slave_clients(bond, slave1);
1055 }
1056 } else {
1057 disabled_slave = slave1;
1058 }
1059
1060 if (bond_slave_can_tx(slave2)) {
1061 alb_send_learning_packets(slave2, slave2->dev->dev_addr, false);
1062 if (bond->alb_info.rlb_enabled) {
1063 /* inform the clients that the mac address
1064 * has changed
1065 */
1066 rlb_req_update_slave_clients(bond, slave2);
1067 }
1068 } else {
1069 disabled_slave = slave2;
1070 }
1071
1072 if (bond->alb_info.rlb_enabled && slaves_state_differ) {
1073 /* A disabled slave was assigned an active mac addr */
1074 rlb_teach_disabled_mac_on_primary(bond,
1075 disabled_slave->dev->dev_addr);
1076 }
1077 }
1078
1079 /**
1080 * alb_change_hw_addr_on_detach
1081 * @bond: bonding we're working on
1082 * @slave: the slave that was just detached
1083 *
1084 * We assume that @slave was already detached from the slave list.
1085 *
1086 * If @slave's permanent hw address is different both from its current
1087 * address and from @bond's address, then somewhere in the bond there's
1088 * a slave that has @slave's permanet address as its current address.
1089 * We'll make sure that that slave no longer uses @slave's permanent address.
1090 *
1091 * Caller must hold RTNL and no other locks
1092 */
1093 static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *slave)
1094 {
1095 int perm_curr_diff;
1096 int perm_bond_diff;
1097 struct slave *found_slave;
1098
1099 perm_curr_diff = !ether_addr_equal_64bits(slave->perm_hwaddr,
1100 slave->dev->dev_addr);
1101 perm_bond_diff = !ether_addr_equal_64bits(slave->perm_hwaddr,
1102 bond->dev->dev_addr);
1103
1104 if (perm_curr_diff && perm_bond_diff) {
1105 found_slave = bond_slave_has_mac(bond, slave->perm_hwaddr);
1106
1107 if (found_slave) {
1108 alb_swap_mac_addr(slave, found_slave);
1109 alb_fasten_mac_swap(bond, slave, found_slave);
1110 }
1111 }
1112 }
1113
1114 /**
1115 * alb_handle_addr_collision_on_attach
1116 * @bond: bonding we're working on
1117 * @slave: the slave that was just attached
1118 *
1119 * checks uniqueness of slave's mac address and handles the case the
1120 * new slave uses the bonds mac address.
1121 *
1122 * If the permanent hw address of @slave is @bond's hw address, we need to
1123 * find a different hw address to give @slave, that isn't in use by any other
1124 * slave in the bond. This address must be, of course, one of the permanent
1125 * addresses of the other slaves.
1126 *
1127 * We go over the slave list, and for each slave there we compare its
1128 * permanent hw address with the current address of all the other slaves.
1129 * If no match was found, then we've found a slave with a permanent address
1130 * that isn't used by any other slave in the bond, so we can assign it to
1131 * @slave.
1132 *
1133 * assumption: this function is called before @slave is attached to the
1134 * bond slave list.
1135 */
1136 static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slave *slave)
1137 {
1138 struct slave *has_bond_addr = rcu_access_pointer(bond->curr_active_slave);
1139 struct slave *tmp_slave1, *free_mac_slave = NULL;
1140 struct list_head *iter;
1141
1142 if (!bond_has_slaves(bond)) {
1143 /* this is the first slave */
1144 return 0;
1145 }
1146
1147 /* if slave's mac address differs from bond's mac address
1148 * check uniqueness of slave's mac address against the other
1149 * slaves in the bond.
1150 */
1151 if (!ether_addr_equal_64bits(slave->perm_hwaddr, bond->dev->dev_addr)) {
1152 if (!bond_slave_has_mac(bond, slave->dev->dev_addr))
1153 return 0;
1154
1155 /* Try setting slave mac to bond address and fall-through
1156 * to code handling that situation below...
1157 */
1158 alb_set_slave_mac_addr(slave, bond->dev->dev_addr);
1159 }
1160
1161 /* The slave's address is equal to the address of the bond.
1162 * Search for a spare address in the bond for this slave.
1163 */
1164 bond_for_each_slave(bond, tmp_slave1, iter) {
1165 if (!bond_slave_has_mac(bond, tmp_slave1->perm_hwaddr)) {
1166 /* no slave has tmp_slave1's perm addr
1167 * as its curr addr
1168 */
1169 free_mac_slave = tmp_slave1;
1170 break;
1171 }
1172
1173 if (!has_bond_addr) {
1174 if (ether_addr_equal_64bits(tmp_slave1->dev->dev_addr,
1175 bond->dev->dev_addr)) {
1176
1177 has_bond_addr = tmp_slave1;
1178 }
1179 }
1180 }
1181
1182 if (free_mac_slave) {
1183 alb_set_slave_mac_addr(slave, free_mac_slave->perm_hwaddr);
1184
1185 netdev_warn(bond->dev, "the hw address of slave %s is in use by the bond; giving it the hw address of %s\n",
1186 slave->dev->name, free_mac_slave->dev->name);
1187
1188 } else if (has_bond_addr) {
1189 netdev_err(bond->dev, "the hw address of slave %s is in use by the bond; couldn't find a slave with a free hw address to give it (this should not have happened)\n",
1190 slave->dev->name);
1191 return -EFAULT;
1192 }
1193
1194 return 0;
1195 }
1196
1197 /**
1198 * alb_set_mac_address
1199 * @bond:
1200 * @addr:
1201 *
1202 * In TLB mode all slaves are configured to the bond's hw address, but set
1203 * their dev_addr field to different addresses (based on their permanent hw
1204 * addresses).
1205 *
1206 * For each slave, this function sets the interface to the new address and then
1207 * changes its dev_addr field to its previous value.
1208 *
1209 * Unwinding assumes bond's mac address has not yet changed.
1210 */
1211 static int alb_set_mac_address(struct bonding *bond, void *addr)
1212 {
1213 struct slave *slave, *rollback_slave;
1214 struct list_head *iter;
1215 struct sockaddr sa;
1216 char tmp_addr[ETH_ALEN];
1217 int res;
1218
1219 if (bond->alb_info.rlb_enabled)
1220 return 0;
1221
1222 bond_for_each_slave(bond, slave, iter) {
1223 /* save net_device's current hw address */
1224 ether_addr_copy(tmp_addr, slave->dev->dev_addr);
1225
1226 res = dev_set_mac_address(slave->dev, addr);
1227
1228 /* restore net_device's hw address */
1229 ether_addr_copy(slave->dev->dev_addr, tmp_addr);
1230
1231 if (res)
1232 goto unwind;
1233 }
1234
1235 return 0;
1236
1237 unwind:
1238 memcpy(sa.sa_data, bond->dev->dev_addr, bond->dev->addr_len);
1239 sa.sa_family = bond->dev->type;
1240
1241 /* unwind from head to the slave that failed */
1242 bond_for_each_slave(bond, rollback_slave, iter) {
1243 if (rollback_slave == slave)
1244 break;
1245 ether_addr_copy(tmp_addr, rollback_slave->dev->dev_addr);
1246 dev_set_mac_address(rollback_slave->dev, &sa);
1247 ether_addr_copy(rollback_slave->dev->dev_addr, tmp_addr);
1248 }
1249
1250 return res;
1251 }
1252
1253 /************************ exported alb funcions ************************/
1254
1255 int bond_alb_initialize(struct bonding *bond, int rlb_enabled)
1256 {
1257 int res;
1258
1259 res = tlb_initialize(bond);
1260 if (res)
1261 return res;
1262
1263 if (rlb_enabled) {
1264 bond->alb_info.rlb_enabled = 1;
1265 res = rlb_initialize(bond);
1266 if (res) {
1267 tlb_deinitialize(bond);
1268 return res;
1269 }
1270 } else {
1271 bond->alb_info.rlb_enabled = 0;
1272 }
1273
1274 return 0;
1275 }
1276
1277 void bond_alb_deinitialize(struct bonding *bond)
1278 {
1279 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1280
1281 tlb_deinitialize(bond);
1282
1283 if (bond_info->rlb_enabled)
1284 rlb_deinitialize(bond);
1285 }
1286
1287 static int bond_do_alb_xmit(struct sk_buff *skb, struct bonding *bond,
1288 struct slave *tx_slave)
1289 {
1290 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1291 struct ethhdr *eth_data = eth_hdr(skb);
1292
1293 if (!tx_slave) {
1294 /* unbalanced or unassigned, send through primary */
1295 tx_slave = rcu_dereference(bond->curr_active_slave);
1296 if (bond->params.tlb_dynamic_lb)
1297 bond_info->unbalanced_load += skb->len;
1298 }
1299
1300 if (tx_slave && bond_slave_can_tx(tx_slave)) {
1301 if (tx_slave != rcu_access_pointer(bond->curr_active_slave)) {
1302 ether_addr_copy(eth_data->h_source,
1303 tx_slave->dev->dev_addr);
1304 }
1305
1306 bond_dev_queue_xmit(bond, skb, tx_slave->dev);
1307 goto out;
1308 }
1309
1310 if (tx_slave && bond->params.tlb_dynamic_lb) {
1311 spin_lock(&bond->mode_lock);
1312 __tlb_clear_slave(bond, tx_slave, 0);
1313 spin_unlock(&bond->mode_lock);
1314 }
1315
1316 /* no suitable interface, frame not sent */
1317 bond_tx_drop(bond->dev, skb);
1318 out:
1319 return NETDEV_TX_OK;
1320 }
1321
1322 int bond_tlb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
1323 {
1324 struct bonding *bond = netdev_priv(bond_dev);
1325 struct ethhdr *eth_data;
1326 struct slave *tx_slave = NULL;
1327 u32 hash_index;
1328
1329 skb_reset_mac_header(skb);
1330 eth_data = eth_hdr(skb);
1331
1332 /* Do not TX balance any multicast or broadcast */
1333 if (!is_multicast_ether_addr(eth_data->h_dest)) {
1334 switch (skb->protocol) {
1335 case htons(ETH_P_IP):
1336 case htons(ETH_P_IPX):
1337 /* In case of IPX, it will falback to L2 hash */
1338 case htons(ETH_P_IPV6):
1339 hash_index = bond_xmit_hash(bond, skb);
1340 if (bond->params.tlb_dynamic_lb) {
1341 tx_slave = tlb_choose_channel(bond,
1342 hash_index & 0xFF,
1343 skb->len);
1344 } else {
1345 struct bond_up_slave *slaves;
1346 unsigned int count;
1347
1348 slaves = rcu_dereference(bond->slave_arr);
1349 count = slaves ? ACCESS_ONCE(slaves->count) : 0;
1350 if (likely(count))
1351 tx_slave = slaves->arr[hash_index %
1352 count];
1353 }
1354 break;
1355 }
1356 }
1357 return bond_do_alb_xmit(skb, bond, tx_slave);
1358 }
1359
1360 int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
1361 {
1362 struct bonding *bond = netdev_priv(bond_dev);
1363 struct ethhdr *eth_data;
1364 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1365 struct slave *tx_slave = NULL;
1366 static const __be32 ip_bcast = htonl(0xffffffff);
1367 int hash_size = 0;
1368 bool do_tx_balance = true;
1369 u32 hash_index = 0;
1370 const u8 *hash_start = NULL;
1371 struct ipv6hdr *ip6hdr;
1372
1373 skb_reset_mac_header(skb);
1374 eth_data = eth_hdr(skb);
1375
1376 switch (ntohs(skb->protocol)) {
1377 case ETH_P_IP: {
1378 const struct iphdr *iph = ip_hdr(skb);
1379
1380 if (ether_addr_equal_64bits(eth_data->h_dest, mac_bcast) ||
1381 (iph->daddr == ip_bcast) ||
1382 (iph->protocol == IPPROTO_IGMP)) {
1383 do_tx_balance = false;
1384 break;
1385 }
1386 hash_start = (char *)&(iph->daddr);
1387 hash_size = sizeof(iph->daddr);
1388 }
1389 break;
1390 case ETH_P_IPV6:
1391 /* IPv6 doesn't really use broadcast mac address, but leave
1392 * that here just in case.
1393 */
1394 if (ether_addr_equal_64bits(eth_data->h_dest, mac_bcast)) {
1395 do_tx_balance = false;
1396 break;
1397 }
1398
1399 /* IPv6 uses all-nodes multicast as an equivalent to
1400 * broadcasts in IPv4.
1401 */
1402 if (ether_addr_equal_64bits(eth_data->h_dest, mac_v6_allmcast)) {
1403 do_tx_balance = false;
1404 break;
1405 }
1406
1407 /* Additianally, DAD probes should not be tx-balanced as that
1408 * will lead to false positives for duplicate addresses and
1409 * prevent address configuration from working.
1410 */
1411 ip6hdr = ipv6_hdr(skb);
1412 if (ipv6_addr_any(&ip6hdr->saddr)) {
1413 do_tx_balance = false;
1414 break;
1415 }
1416
1417 hash_start = (char *)&(ipv6_hdr(skb)->daddr);
1418 hash_size = sizeof(ipv6_hdr(skb)->daddr);
1419 break;
1420 case ETH_P_IPX:
1421 if (ipx_hdr(skb)->ipx_checksum != IPX_NO_CHECKSUM) {
1422 /* something is wrong with this packet */
1423 do_tx_balance = false;
1424 break;
1425 }
1426
1427 if (ipx_hdr(skb)->ipx_type != IPX_TYPE_NCP) {
1428 /* The only protocol worth balancing in
1429 * this family since it has an "ARP" like
1430 * mechanism
1431 */
1432 do_tx_balance = false;
1433 break;
1434 }
1435
1436 hash_start = (char *)eth_data->h_dest;
1437 hash_size = ETH_ALEN;
1438 break;
1439 case ETH_P_ARP:
1440 do_tx_balance = false;
1441 if (bond_info->rlb_enabled)
1442 tx_slave = rlb_arp_xmit(skb, bond);
1443 break;
1444 default:
1445 do_tx_balance = false;
1446 break;
1447 }
1448
1449 if (do_tx_balance) {
1450 hash_index = _simple_hash(hash_start, hash_size);
1451 tx_slave = tlb_choose_channel(bond, hash_index, skb->len);
1452 }
1453
1454 return bond_do_alb_xmit(skb, bond, tx_slave);
1455 }
1456
1457 void bond_alb_monitor(struct work_struct *work)
1458 {
1459 struct bonding *bond = container_of(work, struct bonding,
1460 alb_work.work);
1461 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1462 struct list_head *iter;
1463 struct slave *slave;
1464
1465 if (!bond_has_slaves(bond)) {
1466 bond_info->tx_rebalance_counter = 0;
1467 bond_info->lp_counter = 0;
1468 goto re_arm;
1469 }
1470
1471 rcu_read_lock();
1472
1473 bond_info->tx_rebalance_counter++;
1474 bond_info->lp_counter++;
1475
1476 /* send learning packets */
1477 if (bond_info->lp_counter >= BOND_ALB_LP_TICKS(bond)) {
1478 bool strict_match;
1479
1480 bond_for_each_slave_rcu(bond, slave, iter) {
1481 /* If updating current_active, use all currently
1482 * user mac addreses (!strict_match). Otherwise, only
1483 * use mac of the slave device.
1484 * In RLB mode, we always use strict matches.
1485 */
1486 strict_match = (slave != rcu_access_pointer(bond->curr_active_slave) ||
1487 bond_info->rlb_enabled);
1488 alb_send_learning_packets(slave, slave->dev->dev_addr,
1489 strict_match);
1490 }
1491 bond_info->lp_counter = 0;
1492 }
1493
1494 /* rebalance tx traffic */
1495 if (bond_info->tx_rebalance_counter >= BOND_TLB_REBALANCE_TICKS) {
1496 bond_for_each_slave_rcu(bond, slave, iter) {
1497 tlb_clear_slave(bond, slave, 1);
1498 if (slave == rcu_access_pointer(bond->curr_active_slave)) {
1499 SLAVE_TLB_INFO(slave).load =
1500 bond_info->unbalanced_load /
1501 BOND_TLB_REBALANCE_INTERVAL;
1502 bond_info->unbalanced_load = 0;
1503 }
1504 }
1505 bond_info->tx_rebalance_counter = 0;
1506 }
1507
1508 if (bond_info->rlb_enabled) {
1509 if (bond_info->primary_is_promisc &&
1510 (++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) {
1511
1512 /* dev_set_promiscuity requires rtnl and
1513 * nothing else. Avoid race with bond_close.
1514 */
1515 rcu_read_unlock();
1516 if (!rtnl_trylock())
1517 goto re_arm;
1518
1519 bond_info->rlb_promisc_timeout_counter = 0;
1520
1521 /* If the primary was set to promiscuous mode
1522 * because a slave was disabled then
1523 * it can now leave promiscuous mode.
1524 */
1525 dev_set_promiscuity(rtnl_dereference(bond->curr_active_slave)->dev,
1526 -1);
1527 bond_info->primary_is_promisc = 0;
1528
1529 rtnl_unlock();
1530 rcu_read_lock();
1531 }
1532
1533 if (bond_info->rlb_rebalance) {
1534 bond_info->rlb_rebalance = 0;
1535 rlb_rebalance(bond);
1536 }
1537
1538 /* check if clients need updating */
1539 if (bond_info->rx_ntt) {
1540 if (bond_info->rlb_update_delay_counter) {
1541 --bond_info->rlb_update_delay_counter;
1542 } else {
1543 rlb_update_rx_clients(bond);
1544 if (bond_info->rlb_update_retry_counter)
1545 --bond_info->rlb_update_retry_counter;
1546 else
1547 bond_info->rx_ntt = 0;
1548 }
1549 }
1550 }
1551 rcu_read_unlock();
1552 re_arm:
1553 queue_delayed_work(bond->wq, &bond->alb_work, alb_delta_in_ticks);
1554 }
1555
1556 /* assumption: called before the slave is attached to the bond
1557 * and not locked by the bond lock
1558 */
1559 int bond_alb_init_slave(struct bonding *bond, struct slave *slave)
1560 {
1561 int res;
1562
1563 res = alb_set_slave_mac_addr(slave, slave->perm_hwaddr);
1564 if (res)
1565 return res;
1566
1567 res = alb_handle_addr_collision_on_attach(bond, slave);
1568 if (res)
1569 return res;
1570
1571 tlb_init_slave(slave);
1572
1573 /* order a rebalance ASAP */
1574 bond->alb_info.tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS;
1575
1576 if (bond->alb_info.rlb_enabled)
1577 bond->alb_info.rlb_rebalance = 1;
1578
1579 return 0;
1580 }
1581
1582 /* Remove slave from tlb and rlb hash tables, and fix up MAC addresses
1583 * if necessary.
1584 *
1585 * Caller must hold RTNL and no other locks
1586 */
1587 void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave)
1588 {
1589 if (bond_has_slaves(bond))
1590 alb_change_hw_addr_on_detach(bond, slave);
1591
1592 tlb_clear_slave(bond, slave, 0);
1593
1594 if (bond->alb_info.rlb_enabled) {
1595 bond->alb_info.rx_slave = NULL;
1596 rlb_clear_slave(bond, slave);
1597 }
1598
1599 }
1600
1601 void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link)
1602 {
1603 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1604
1605 if (link == BOND_LINK_DOWN) {
1606 tlb_clear_slave(bond, slave, 0);
1607 if (bond->alb_info.rlb_enabled)
1608 rlb_clear_slave(bond, slave);
1609 } else if (link == BOND_LINK_UP) {
1610 /* order a rebalance ASAP */
1611 bond_info->tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS;
1612 if (bond->alb_info.rlb_enabled) {
1613 bond->alb_info.rlb_rebalance = 1;
1614 /* If the updelay module parameter is smaller than the
1615 * forwarding delay of the switch the rebalance will
1616 * not work because the rebalance arp replies will
1617 * not be forwarded to the clients..
1618 */
1619 }
1620 }
1621
1622 if (bond_is_nondyn_tlb(bond)) {
1623 if (bond_update_slave_arr(bond, NULL))
1624 pr_err("Failed to build slave-array for TLB mode.\n");
1625 }
1626 }
1627
1628 /**
1629 * bond_alb_handle_active_change - assign new curr_active_slave
1630 * @bond: our bonding struct
1631 * @new_slave: new slave to assign
1632 *
1633 * Set the bond->curr_active_slave to @new_slave and handle
1634 * mac address swapping and promiscuity changes as needed.
1635 *
1636 * Caller must hold RTNL
1637 */
1638 void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave)
1639 {
1640 struct slave *swap_slave;
1641 struct slave *curr_active;
1642
1643 curr_active = rtnl_dereference(bond->curr_active_slave);
1644 if (curr_active == new_slave)
1645 return;
1646
1647 if (curr_active && bond->alb_info.primary_is_promisc) {
1648 dev_set_promiscuity(curr_active->dev, -1);
1649 bond->alb_info.primary_is_promisc = 0;
1650 bond->alb_info.rlb_promisc_timeout_counter = 0;
1651 }
1652
1653 swap_slave = curr_active;
1654 rcu_assign_pointer(bond->curr_active_slave, new_slave);
1655
1656 if (!new_slave || !bond_has_slaves(bond))
1657 return;
1658
1659 /* set the new curr_active_slave to the bonds mac address
1660 * i.e. swap mac addresses of old curr_active_slave and new curr_active_slave
1661 */
1662 if (!swap_slave)
1663 swap_slave = bond_slave_has_mac(bond, bond->dev->dev_addr);
1664
1665 /* Arrange for swap_slave and new_slave to temporarily be
1666 * ignored so we can mess with their MAC addresses without
1667 * fear of interference from transmit activity.
1668 */
1669 if (swap_slave)
1670 tlb_clear_slave(bond, swap_slave, 1);
1671 tlb_clear_slave(bond, new_slave, 1);
1672
1673 /* in TLB mode, the slave might flip down/up with the old dev_addr,
1674 * and thus filter bond->dev_addr's packets, so force bond's mac
1675 */
1676 if (BOND_MODE(bond) == BOND_MODE_TLB) {
1677 struct sockaddr sa;
1678 u8 tmp_addr[ETH_ALEN];
1679
1680 ether_addr_copy(tmp_addr, new_slave->dev->dev_addr);
1681
1682 memcpy(sa.sa_data, bond->dev->dev_addr, bond->dev->addr_len);
1683 sa.sa_family = bond->dev->type;
1684 /* we don't care if it can't change its mac, best effort */
1685 dev_set_mac_address(new_slave->dev, &sa);
1686
1687 ether_addr_copy(new_slave->dev->dev_addr, tmp_addr);
1688 }
1689
1690 /* curr_active_slave must be set before calling alb_swap_mac_addr */
1691 if (swap_slave) {
1692 /* swap mac address */
1693 alb_swap_mac_addr(swap_slave, new_slave);
1694 alb_fasten_mac_swap(bond, swap_slave, new_slave);
1695 } else {
1696 /* set the new_slave to the bond mac address */
1697 alb_set_slave_mac_addr(new_slave, bond->dev->dev_addr);
1698 alb_send_learning_packets(new_slave, bond->dev->dev_addr,
1699 false);
1700 }
1701 }
1702
1703 /* Called with RTNL */
1704 int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr)
1705 {
1706 struct bonding *bond = netdev_priv(bond_dev);
1707 struct sockaddr *sa = addr;
1708 struct slave *curr_active;
1709 struct slave *swap_slave;
1710 int res;
1711
1712 if (!is_valid_ether_addr(sa->sa_data))
1713 return -EADDRNOTAVAIL;
1714
1715 res = alb_set_mac_address(bond, addr);
1716 if (res)
1717 return res;
1718
1719 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
1720
1721 /* If there is no curr_active_slave there is nothing else to do.
1722 * Otherwise we'll need to pass the new address to it and handle
1723 * duplications.
1724 */
1725 curr_active = rtnl_dereference(bond->curr_active_slave);
1726 if (!curr_active)
1727 return 0;
1728
1729 swap_slave = bond_slave_has_mac(bond, bond_dev->dev_addr);
1730
1731 if (swap_slave) {
1732 alb_swap_mac_addr(swap_slave, curr_active);
1733 alb_fasten_mac_swap(bond, swap_slave, curr_active);
1734 } else {
1735 alb_set_slave_mac_addr(curr_active, bond_dev->dev_addr);
1736
1737 alb_send_learning_packets(curr_active,
1738 bond_dev->dev_addr, false);
1739 if (bond->alb_info.rlb_enabled) {
1740 /* inform clients mac address has changed */
1741 rlb_req_update_slave_clients(bond, curr_active);
1742 }
1743 }
1744
1745 return 0;
1746 }
1747
1748 void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
1749 {
1750 if (bond->alb_info.rlb_enabled)
1751 rlb_clear_vlan(bond, vlan_id);
1752 }
1753
Linux kernel - Deliverables
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