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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
45static const u8 mac_bcast[ETH_ALEN + 2] __long_aligned = {
46 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
47};
48static const u8 mac_v6_allmcast[ETH_ALEN + 2] __long_aligned = {
49 0x33, 0x33, 0x00, 0x00, 0x00, 0x01
50};
51static const int alb_delta_in_ticks = HZ / ALB_TIMER_TICKS_PER_SEC;
52
53#pragma pack(1)
54struct 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
61struct 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
74static 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 */
80static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[],
81 bool strict_match);
82static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp);
83static void rlb_src_unlink(struct bonding *bond, u32 index);
84static void rlb_src_link(struct bonding *bond, u32 ip_src_hash,
85 u32 ip_dst_hash);
86
87static 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
100static 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
113static 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
119static 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
141static 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 */
150static 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 */
174static 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
186static 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
192static 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
216static 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
252static 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 */
273static 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
297static 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 }
326out:
327 return RX_HANDLER_ANOTHER;
328}
329
330/* Caller must hold rcu_read_lock() */
331static 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 */
364static 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 */
382static 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 */
405static 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
449static void rlb_update_client(struct rlb_client_info *client_info)
450{
451 int i;
452
453 if (!client_info->slave || !is_valid_ether_addr(client_info->mac_dst))
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 */
484static 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 */
512static 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 */
544static 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
577static 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 */
675static 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 bond_hw_addr_copy(arp->mac_src, tx_slave->dev->dev_addr,
691 tx_slave->dev->addr_len);
692 netdev_dbg(bond->dev, "Server sent ARP Reply packet\n");
693 } else if (arp->op_code == htons(ARPOP_REQUEST)) {
694 /* Create an entry in the rx_hashtbl for this client as a
695 * place holder.
696 * When the arp reply is received the entry will be updated
697 * with the correct unicast address of the client.
698 */
699 rlb_choose_channel(skb, bond);
700
701 /* The ARP reply packets must be delayed so that
702 * they can cancel out the influence of the ARP request.
703 */
704 bond->alb_info.rlb_update_delay_counter = RLB_UPDATE_DELAY;
705
706 /* arp requests are broadcast and are sent on the primary
707 * the arp request will collapse all clients on the subnet to
708 * the primary slave. We must register these clients to be
709 * updated with their assigned mac.
710 */
711 rlb_req_update_subnet_clients(bond, arp->ip_src);
712 netdev_dbg(bond->dev, "Server sent ARP Request packet\n");
713 }
714
715 return tx_slave;
716}
717
718static void rlb_rebalance(struct bonding *bond)
719{
720 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
721 struct slave *assigned_slave;
722 struct rlb_client_info *client_info;
723 int ntt;
724 u32 hash_index;
725
726 spin_lock_bh(&bond->mode_lock);
727
728 ntt = 0;
729 hash_index = bond_info->rx_hashtbl_used_head;
730 for (; hash_index != RLB_NULL_INDEX;
731 hash_index = client_info->used_next) {
732 client_info = &(bond_info->rx_hashtbl[hash_index]);
733 assigned_slave = __rlb_next_rx_slave(bond);
734 if (assigned_slave && (client_info->slave != assigned_slave)) {
735 client_info->slave = assigned_slave;
736 client_info->ntt = 1;
737 ntt = 1;
738 }
739 }
740
741 /* update the team's flag only after the whole iteration */
742 if (ntt)
743 bond_info->rx_ntt = 1;
744 spin_unlock_bh(&bond->mode_lock);
745}
746
747/* Caller must hold mode_lock */
748static void rlb_init_table_entry_dst(struct rlb_client_info *entry)
749{
750 entry->used_next = RLB_NULL_INDEX;
751 entry->used_prev = RLB_NULL_INDEX;
752 entry->assigned = 0;
753 entry->slave = NULL;
754 entry->vlan_id = 0;
755}
756static void rlb_init_table_entry_src(struct rlb_client_info *entry)
757{
758 entry->src_first = RLB_NULL_INDEX;
759 entry->src_prev = RLB_NULL_INDEX;
760 entry->src_next = RLB_NULL_INDEX;
761}
762
763static void rlb_init_table_entry(struct rlb_client_info *entry)
764{
765 memset(entry, 0, sizeof(struct rlb_client_info));
766 rlb_init_table_entry_dst(entry);
767 rlb_init_table_entry_src(entry);
768}
769
770static void rlb_delete_table_entry_dst(struct bonding *bond, u32 index)
771{
772 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
773 u32 next_index = bond_info->rx_hashtbl[index].used_next;
774 u32 prev_index = bond_info->rx_hashtbl[index].used_prev;
775
776 if (index == bond_info->rx_hashtbl_used_head)
777 bond_info->rx_hashtbl_used_head = next_index;
778 if (prev_index != RLB_NULL_INDEX)
779 bond_info->rx_hashtbl[prev_index].used_next = next_index;
780 if (next_index != RLB_NULL_INDEX)
781 bond_info->rx_hashtbl[next_index].used_prev = prev_index;
782}
783
784/* unlink a rlb hash table entry from the src list */
785static void rlb_src_unlink(struct bonding *bond, u32 index)
786{
787 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
788 u32 next_index = bond_info->rx_hashtbl[index].src_next;
789 u32 prev_index = bond_info->rx_hashtbl[index].src_prev;
790
791 bond_info->rx_hashtbl[index].src_next = RLB_NULL_INDEX;
792 bond_info->rx_hashtbl[index].src_prev = RLB_NULL_INDEX;
793
794 if (next_index != RLB_NULL_INDEX)
795 bond_info->rx_hashtbl[next_index].src_prev = prev_index;
796
797 if (prev_index == RLB_NULL_INDEX)
798 return;
799
800 /* is prev_index pointing to the head of this list? */
801 if (bond_info->rx_hashtbl[prev_index].src_first == index)
802 bond_info->rx_hashtbl[prev_index].src_first = next_index;
803 else
804 bond_info->rx_hashtbl[prev_index].src_next = next_index;
805
806}
807
808static void rlb_delete_table_entry(struct bonding *bond, u32 index)
809{
810 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
811 struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]);
812
813 rlb_delete_table_entry_dst(bond, index);
814 rlb_init_table_entry_dst(entry);
815
816 rlb_src_unlink(bond, index);
817}
818
819/* add the rx_hashtbl[ip_dst_hash] entry to the list
820 * of entries with identical ip_src_hash
821 */
822static void rlb_src_link(struct bonding *bond, u32 ip_src_hash, u32 ip_dst_hash)
823{
824 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
825 u32 next;
826
827 bond_info->rx_hashtbl[ip_dst_hash].src_prev = ip_src_hash;
828 next = bond_info->rx_hashtbl[ip_src_hash].src_first;
829 bond_info->rx_hashtbl[ip_dst_hash].src_next = next;
830 if (next != RLB_NULL_INDEX)
831 bond_info->rx_hashtbl[next].src_prev = ip_dst_hash;
832 bond_info->rx_hashtbl[ip_src_hash].src_first = ip_dst_hash;
833}
834
835/* deletes all rx_hashtbl entries with arp->ip_src if their mac_src does
836 * not match arp->mac_src
837 */
838static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp)
839{
840 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
841 u32 ip_src_hash = _simple_hash((u8 *)&(arp->ip_src), sizeof(arp->ip_src));
842 u32 index;
843
844 spin_lock_bh(&bond->mode_lock);
845
846 index = bond_info->rx_hashtbl[ip_src_hash].src_first;
847 while (index != RLB_NULL_INDEX) {
848 struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]);
849 u32 next_index = entry->src_next;
850 if (entry->ip_src == arp->ip_src &&
851 !ether_addr_equal_64bits(arp->mac_src, entry->mac_src))
852 rlb_delete_table_entry(bond, index);
853 index = next_index;
854 }
855 spin_unlock_bh(&bond->mode_lock);
856}
857
858static int rlb_initialize(struct bonding *bond)
859{
860 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
861 struct rlb_client_info *new_hashtbl;
862 int size = RLB_HASH_TABLE_SIZE * sizeof(struct rlb_client_info);
863 int i;
864
865 new_hashtbl = kmalloc(size, GFP_KERNEL);
866 if (!new_hashtbl)
867 return -1;
868
869 spin_lock_bh(&bond->mode_lock);
870
871 bond_info->rx_hashtbl = new_hashtbl;
872
873 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
874
875 for (i = 0; i < RLB_HASH_TABLE_SIZE; i++)
876 rlb_init_table_entry(bond_info->rx_hashtbl + i);
877
878 spin_unlock_bh(&bond->mode_lock);
879
880 /* register to receive ARPs */
881 bond->recv_probe = rlb_arp_recv;
882
883 return 0;
884}
885
886static void rlb_deinitialize(struct bonding *bond)
887{
888 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
889
890 spin_lock_bh(&bond->mode_lock);
891
892 kfree(bond_info->rx_hashtbl);
893 bond_info->rx_hashtbl = NULL;
894 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
895
896 spin_unlock_bh(&bond->mode_lock);
897}
898
899static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
900{
901 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
902 u32 curr_index;
903
904 spin_lock_bh(&bond->mode_lock);
905
906 curr_index = bond_info->rx_hashtbl_used_head;
907 while (curr_index != RLB_NULL_INDEX) {
908 struct rlb_client_info *curr = &(bond_info->rx_hashtbl[curr_index]);
909 u32 next_index = bond_info->rx_hashtbl[curr_index].used_next;
910
911 if (curr->vlan_id == vlan_id)
912 rlb_delete_table_entry(bond, curr_index);
913
914 curr_index = next_index;
915 }
916
917 spin_unlock_bh(&bond->mode_lock);
918}
919
920/*********************** tlb/rlb shared functions *********************/
921
922static void alb_send_lp_vid(struct slave *slave, u8 mac_addr[],
923 __be16 vlan_proto, u16 vid)
924{
925 struct learning_pkt pkt;
926 struct sk_buff *skb;
927 int size = sizeof(struct learning_pkt);
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 skb_put_data(skb, &pkt, size);
939
940 skb_reset_mac_header(skb);
941 skb->network_header = skb->mac_header + ETH_HLEN;
942 skb->protocol = pkt.type;
943 skb->priority = TC_PRIO_CONTROL;
944 skb->dev = slave->dev;
945
946 netdev_dbg(slave->bond->dev,
947 "Send learning packet: dev %s mac %pM vlan %d\n",
948 slave->dev->name, mac_addr, vid);
949
950 if (vid)
951 __vlan_hwaccel_put_tag(skb, vlan_proto, vid);
952
953 dev_queue_xmit(skb);
954}
955
956struct alb_walk_data {
957 struct bonding *bond;
958 struct slave *slave;
959 u8 *mac_addr;
960 bool strict_match;
961};
962
963static int alb_upper_dev_walk(struct net_device *upper, void *_data)
964{
965 struct alb_walk_data *data = _data;
966 bool strict_match = data->strict_match;
967 struct bonding *bond = data->bond;
968 struct slave *slave = data->slave;
969 u8 *mac_addr = data->mac_addr;
970 struct bond_vlan_tag *tags;
971
972 if (is_vlan_dev(upper) &&
973 bond->nest_level == vlan_get_encap_level(upper) - 1) {
974 if (upper->addr_assign_type == NET_ADDR_STOLEN) {
975 alb_send_lp_vid(slave, mac_addr,
976 vlan_dev_vlan_proto(upper),
977 vlan_dev_vlan_id(upper));
978 } else {
979 alb_send_lp_vid(slave, upper->dev_addr,
980 vlan_dev_vlan_proto(upper),
981 vlan_dev_vlan_id(upper));
982 }
983 }
984
985 /* If this is a macvlan device, then only send updates
986 * when strict_match is turned off.
987 */
988 if (netif_is_macvlan(upper) && !strict_match) {
989 tags = bond_verify_device_path(bond->dev, upper, 0);
990 if (IS_ERR_OR_NULL(tags))
991 BUG();
992 alb_send_lp_vid(slave, upper->dev_addr,
993 tags[0].vlan_proto, tags[0].vlan_id);
994 kfree(tags);
995 }
996
997 return 0;
998}
999
1000static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[],
1001 bool strict_match)
1002{
1003 struct bonding *bond = bond_get_bond_by_slave(slave);
1004 struct alb_walk_data data = {
1005 .strict_match = strict_match,
1006 .mac_addr = mac_addr,
1007 .slave = slave,
1008 .bond = bond,
1009 };
1010
1011 /* send untagged */
1012 alb_send_lp_vid(slave, mac_addr, 0, 0);
1013
1014 /* loop through all devices and see if we need to send a packet
1015 * for that device.
1016 */
1017 rcu_read_lock();
1018 netdev_walk_all_upper_dev_rcu(bond->dev, alb_upper_dev_walk, &data);
1019 rcu_read_unlock();
1020}
1021
1022static int alb_set_slave_mac_addr(struct slave *slave, u8 addr[],
1023 unsigned int len)
1024{
1025 struct net_device *dev = slave->dev;
1026 struct sockaddr_storage ss;
1027
1028 if (BOND_MODE(slave->bond) == BOND_MODE_TLB) {
1029 memcpy(dev->dev_addr, addr, len);
1030 return 0;
1031 }
1032
1033 /* for rlb each slave must have a unique hw mac addresses so that
1034 * each slave will receive packets destined to a different mac
1035 */
1036 memcpy(ss.__data, addr, len);
1037 ss.ss_family = dev->type;
1038 if (dev_set_mac_address(dev, (struct sockaddr *)&ss)) {
1039 netdev_err(slave->bond->dev, "dev_set_mac_address of dev %s failed! ALB mode requires that the base driver support setting the hw address also when the network device's interface is open\n",
1040 dev->name);
1041 return -EOPNOTSUPP;
1042 }
1043 return 0;
1044}
1045
1046/* Swap MAC addresses between two slaves.
1047 *
1048 * Called with RTNL held, and no other locks.
1049 */
1050static void alb_swap_mac_addr(struct slave *slave1, struct slave *slave2)
1051{
1052 u8 tmp_mac_addr[MAX_ADDR_LEN];
1053
1054 bond_hw_addr_copy(tmp_mac_addr, slave1->dev->dev_addr,
1055 slave1->dev->addr_len);
1056 alb_set_slave_mac_addr(slave1, slave2->dev->dev_addr,
1057 slave2->dev->addr_len);
1058 alb_set_slave_mac_addr(slave2, tmp_mac_addr,
1059 slave1->dev->addr_len);
1060
1061}
1062
1063/* Send learning packets after MAC address swap.
1064 *
1065 * Called with RTNL and no other locks
1066 */
1067static void alb_fasten_mac_swap(struct bonding *bond, struct slave *slave1,
1068 struct slave *slave2)
1069{
1070 int slaves_state_differ = (bond_slave_can_tx(slave1) != bond_slave_can_tx(slave2));
1071 struct slave *disabled_slave = NULL;
1072
1073 ASSERT_RTNL();
1074
1075 /* fasten the change in the switch */
1076 if (bond_slave_can_tx(slave1)) {
1077 alb_send_learning_packets(slave1, slave1->dev->dev_addr, false);
1078 if (bond->alb_info.rlb_enabled) {
1079 /* inform the clients that the mac address
1080 * has changed
1081 */
1082 rlb_req_update_slave_clients(bond, slave1);
1083 }
1084 } else {
1085 disabled_slave = slave1;
1086 }
1087
1088 if (bond_slave_can_tx(slave2)) {
1089 alb_send_learning_packets(slave2, slave2->dev->dev_addr, false);
1090 if (bond->alb_info.rlb_enabled) {
1091 /* inform the clients that the mac address
1092 * has changed
1093 */
1094 rlb_req_update_slave_clients(bond, slave2);
1095 }
1096 } else {
1097 disabled_slave = slave2;
1098 }
1099
1100 if (bond->alb_info.rlb_enabled && slaves_state_differ) {
1101 /* A disabled slave was assigned an active mac addr */
1102 rlb_teach_disabled_mac_on_primary(bond,
1103 disabled_slave->dev->dev_addr);
1104 }
1105}
1106
1107/**
1108 * alb_change_hw_addr_on_detach
1109 * @bond: bonding we're working on
1110 * @slave: the slave that was just detached
1111 *
1112 * We assume that @slave was already detached from the slave list.
1113 *
1114 * If @slave's permanent hw address is different both from its current
1115 * address and from @bond's address, then somewhere in the bond there's
1116 * a slave that has @slave's permanet address as its current address.
1117 * We'll make sure that that slave no longer uses @slave's permanent address.
1118 *
1119 * Caller must hold RTNL and no other locks
1120 */
1121static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *slave)
1122{
1123 int perm_curr_diff;
1124 int perm_bond_diff;
1125 struct slave *found_slave;
1126
1127 perm_curr_diff = !ether_addr_equal_64bits(slave->perm_hwaddr,
1128 slave->dev->dev_addr);
1129 perm_bond_diff = !ether_addr_equal_64bits(slave->perm_hwaddr,
1130 bond->dev->dev_addr);
1131
1132 if (perm_curr_diff && perm_bond_diff) {
1133 found_slave = bond_slave_has_mac(bond, slave->perm_hwaddr);
1134
1135 if (found_slave) {
1136 alb_swap_mac_addr(slave, found_slave);
1137 alb_fasten_mac_swap(bond, slave, found_slave);
1138 }
1139 }
1140}
1141
1142/**
1143 * alb_handle_addr_collision_on_attach
1144 * @bond: bonding we're working on
1145 * @slave: the slave that was just attached
1146 *
1147 * checks uniqueness of slave's mac address and handles the case the
1148 * new slave uses the bonds mac address.
1149 *
1150 * If the permanent hw address of @slave is @bond's hw address, we need to
1151 * find a different hw address to give @slave, that isn't in use by any other
1152 * slave in the bond. This address must be, of course, one of the permanent
1153 * addresses of the other slaves.
1154 *
1155 * We go over the slave list, and for each slave there we compare its
1156 * permanent hw address with the current address of all the other slaves.
1157 * If no match was found, then we've found a slave with a permanent address
1158 * that isn't used by any other slave in the bond, so we can assign it to
1159 * @slave.
1160 *
1161 * assumption: this function is called before @slave is attached to the
1162 * bond slave list.
1163 */
1164static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slave *slave)
1165{
1166 struct slave *has_bond_addr = rcu_access_pointer(bond->curr_active_slave);
1167 struct slave *tmp_slave1, *free_mac_slave = NULL;
1168 struct list_head *iter;
1169
1170 if (!bond_has_slaves(bond)) {
1171 /* this is the first slave */
1172 return 0;
1173 }
1174
1175 /* if slave's mac address differs from bond's mac address
1176 * check uniqueness of slave's mac address against the other
1177 * slaves in the bond.
1178 */
1179 if (!ether_addr_equal_64bits(slave->perm_hwaddr, bond->dev->dev_addr)) {
1180 if (!bond_slave_has_mac(bond, slave->dev->dev_addr))
1181 return 0;
1182
1183 /* Try setting slave mac to bond address and fall-through
1184 * to code handling that situation below...
1185 */
1186 alb_set_slave_mac_addr(slave, bond->dev->dev_addr,
1187 bond->dev->addr_len);
1188 }
1189
1190 /* The slave's address is equal to the address of the bond.
1191 * Search for a spare address in the bond for this slave.
1192 */
1193 bond_for_each_slave(bond, tmp_slave1, iter) {
1194 if (!bond_slave_has_mac(bond, tmp_slave1->perm_hwaddr)) {
1195 /* no slave has tmp_slave1's perm addr
1196 * as its curr addr
1197 */
1198 free_mac_slave = tmp_slave1;
1199 break;
1200 }
1201
1202 if (!has_bond_addr) {
1203 if (ether_addr_equal_64bits(tmp_slave1->dev->dev_addr,
1204 bond->dev->dev_addr)) {
1205
1206 has_bond_addr = tmp_slave1;
1207 }
1208 }
1209 }
1210
1211 if (free_mac_slave) {
1212 alb_set_slave_mac_addr(slave, free_mac_slave->perm_hwaddr,
1213 free_mac_slave->dev->addr_len);
1214
1215 netdev_warn(bond->dev, "the hw address of slave %s is in use by the bond; giving it the hw address of %s\n",
1216 slave->dev->name, free_mac_slave->dev->name);
1217
1218 } else if (has_bond_addr) {
1219 netdev_err(bond->dev, "the hw address of slave %s is in use by the bond; couldn't find a slave with a free hw address to give it (this should not have happened)\n",
1220 slave->dev->name);
1221 return -EFAULT;
1222 }
1223
1224 return 0;
1225}
1226
1227/**
1228 * alb_set_mac_address
1229 * @bond:
1230 * @addr:
1231 *
1232 * In TLB mode all slaves are configured to the bond's hw address, but set
1233 * their dev_addr field to different addresses (based on their permanent hw
1234 * addresses).
1235 *
1236 * For each slave, this function sets the interface to the new address and then
1237 * changes its dev_addr field to its previous value.
1238 *
1239 * Unwinding assumes bond's mac address has not yet changed.
1240 */
1241static int alb_set_mac_address(struct bonding *bond, void *addr)
1242{
1243 struct slave *slave, *rollback_slave;
1244 struct list_head *iter;
1245 struct sockaddr_storage ss;
1246 char tmp_addr[MAX_ADDR_LEN];
1247 int res;
1248
1249 if (bond->alb_info.rlb_enabled)
1250 return 0;
1251
1252 bond_for_each_slave(bond, slave, iter) {
1253 /* save net_device's current hw address */
1254 bond_hw_addr_copy(tmp_addr, slave->dev->dev_addr,
1255 slave->dev->addr_len);
1256
1257 res = dev_set_mac_address(slave->dev, addr);
1258
1259 /* restore net_device's hw address */
1260 bond_hw_addr_copy(slave->dev->dev_addr, tmp_addr,
1261 slave->dev->addr_len);
1262
1263 if (res)
1264 goto unwind;
1265 }
1266
1267 return 0;
1268
1269unwind:
1270 memcpy(ss.__data, bond->dev->dev_addr, bond->dev->addr_len);
1271 ss.ss_family = bond->dev->type;
1272
1273 /* unwind from head to the slave that failed */
1274 bond_for_each_slave(bond, rollback_slave, iter) {
1275 if (rollback_slave == slave)
1276 break;
1277 bond_hw_addr_copy(tmp_addr, rollback_slave->dev->dev_addr,
1278 rollback_slave->dev->addr_len);
1279 dev_set_mac_address(rollback_slave->dev,
1280 (struct sockaddr *)&ss);
1281 bond_hw_addr_copy(rollback_slave->dev->dev_addr, tmp_addr,
1282 rollback_slave->dev->addr_len);
1283 }
1284
1285 return res;
1286}
1287
1288/************************ exported alb funcions ************************/
1289
1290int bond_alb_initialize(struct bonding *bond, int rlb_enabled)
1291{
1292 int res;
1293
1294 res = tlb_initialize(bond);
1295 if (res)
1296 return res;
1297
1298 if (rlb_enabled) {
1299 bond->alb_info.rlb_enabled = 1;
1300 res = rlb_initialize(bond);
1301 if (res) {
1302 tlb_deinitialize(bond);
1303 return res;
1304 }
1305 } else {
1306 bond->alb_info.rlb_enabled = 0;
1307 }
1308
1309 return 0;
1310}
1311
1312void bond_alb_deinitialize(struct bonding *bond)
1313{
1314 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1315
1316 tlb_deinitialize(bond);
1317
1318 if (bond_info->rlb_enabled)
1319 rlb_deinitialize(bond);
1320}
1321
1322static int bond_do_alb_xmit(struct sk_buff *skb, struct bonding *bond,
1323 struct slave *tx_slave)
1324{
1325 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1326 struct ethhdr *eth_data = eth_hdr(skb);
1327
1328 if (!tx_slave) {
1329 /* unbalanced or unassigned, send through primary */
1330 tx_slave = rcu_dereference(bond->curr_active_slave);
1331 if (bond->params.tlb_dynamic_lb)
1332 bond_info->unbalanced_load += skb->len;
1333 }
1334
1335 if (tx_slave && bond_slave_can_tx(tx_slave)) {
1336 if (tx_slave != rcu_access_pointer(bond->curr_active_slave)) {
1337 ether_addr_copy(eth_data->h_source,
1338 tx_slave->dev->dev_addr);
1339 }
1340
1341 bond_dev_queue_xmit(bond, skb, tx_slave->dev);
1342 goto out;
1343 }
1344
1345 if (tx_slave && bond->params.tlb_dynamic_lb) {
1346 spin_lock(&bond->mode_lock);
1347 __tlb_clear_slave(bond, tx_slave, 0);
1348 spin_unlock(&bond->mode_lock);
1349 }
1350
1351 /* no suitable interface, frame not sent */
1352 bond_tx_drop(bond->dev, skb);
1353out:
1354 return NETDEV_TX_OK;
1355}
1356
1357int bond_tlb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
1358{
1359 struct bonding *bond = netdev_priv(bond_dev);
1360 struct ethhdr *eth_data;
1361 struct slave *tx_slave = NULL;
1362 u32 hash_index;
1363
1364 skb_reset_mac_header(skb);
1365 eth_data = eth_hdr(skb);
1366
1367 /* Do not TX balance any multicast or broadcast */
1368 if (!is_multicast_ether_addr(eth_data->h_dest)) {
1369 switch (skb->protocol) {
1370 case htons(ETH_P_IP):
1371 case htons(ETH_P_IPX):
1372 /* In case of IPX, it will falback to L2 hash */
1373 case htons(ETH_P_IPV6):
1374 hash_index = bond_xmit_hash(bond, skb);
1375 if (bond->params.tlb_dynamic_lb) {
1376 tx_slave = tlb_choose_channel(bond,
1377 hash_index & 0xFF,
1378 skb->len);
1379 } else {
1380 struct bond_up_slave *slaves;
1381 unsigned int count;
1382
1383 slaves = rcu_dereference(bond->slave_arr);
1384 count = slaves ? READ_ONCE(slaves->count) : 0;
1385 if (likely(count))
1386 tx_slave = slaves->arr[hash_index %
1387 count];
1388 }
1389 break;
1390 }
1391 }
1392 return bond_do_alb_xmit(skb, bond, tx_slave);
1393}
1394
1395int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
1396{
1397 struct bonding *bond = netdev_priv(bond_dev);
1398 struct ethhdr *eth_data;
1399 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1400 struct slave *tx_slave = NULL;
1401 static const __be32 ip_bcast = htonl(0xffffffff);
1402 int hash_size = 0;
1403 bool do_tx_balance = true;
1404 u32 hash_index = 0;
1405 const u8 *hash_start = NULL;
1406 struct ipv6hdr *ip6hdr;
1407
1408 skb_reset_mac_header(skb);
1409 eth_data = eth_hdr(skb);
1410
1411 switch (ntohs(skb->protocol)) {
1412 case ETH_P_IP: {
1413 const struct iphdr *iph = ip_hdr(skb);
1414
1415 if (ether_addr_equal_64bits(eth_data->h_dest, mac_bcast) ||
1416 (iph->daddr == ip_bcast) ||
1417 (iph->protocol == IPPROTO_IGMP)) {
1418 do_tx_balance = false;
1419 break;
1420 }
1421 hash_start = (char *)&(iph->daddr);
1422 hash_size = sizeof(iph->daddr);
1423 }
1424 break;
1425 case ETH_P_IPV6:
1426 /* IPv6 doesn't really use broadcast mac address, but leave
1427 * that here just in case.
1428 */
1429 if (ether_addr_equal_64bits(eth_data->h_dest, mac_bcast)) {
1430 do_tx_balance = false;
1431 break;
1432 }
1433
1434 /* IPv6 uses all-nodes multicast as an equivalent to
1435 * broadcasts in IPv4.
1436 */
1437 if (ether_addr_equal_64bits(eth_data->h_dest, mac_v6_allmcast)) {
1438 do_tx_balance = false;
1439 break;
1440 }
1441
1442 /* Additianally, DAD probes should not be tx-balanced as that
1443 * will lead to false positives for duplicate addresses and
1444 * prevent address configuration from working.
1445 */
1446 ip6hdr = ipv6_hdr(skb);
1447 if (ipv6_addr_any(&ip6hdr->saddr)) {
1448 do_tx_balance = false;
1449 break;
1450 }
1451
1452 hash_start = (char *)&(ipv6_hdr(skb)->daddr);
1453 hash_size = sizeof(ipv6_hdr(skb)->daddr);
1454 break;
1455 case ETH_P_IPX:
1456 if (ipx_hdr(skb)->ipx_checksum != IPX_NO_CHECKSUM) {
1457 /* something is wrong with this packet */
1458 do_tx_balance = false;
1459 break;
1460 }
1461
1462 if (ipx_hdr(skb)->ipx_type != IPX_TYPE_NCP) {
1463 /* The only protocol worth balancing in
1464 * this family since it has an "ARP" like
1465 * mechanism
1466 */
1467 do_tx_balance = false;
1468 break;
1469 }
1470
1471 hash_start = (char *)eth_data->h_dest;
1472 hash_size = ETH_ALEN;
1473 break;
1474 case ETH_P_ARP:
1475 do_tx_balance = false;
1476 if (bond_info->rlb_enabled)
1477 tx_slave = rlb_arp_xmit(skb, bond);
1478 break;
1479 default:
1480 do_tx_balance = false;
1481 break;
1482 }
1483
1484 if (do_tx_balance) {
1485 hash_index = _simple_hash(hash_start, hash_size);
1486 tx_slave = tlb_choose_channel(bond, hash_index, skb->len);
1487 }
1488
1489 return bond_do_alb_xmit(skb, bond, tx_slave);
1490}
1491
1492void bond_alb_monitor(struct work_struct *work)
1493{
1494 struct bonding *bond = container_of(work, struct bonding,
1495 alb_work.work);
1496 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1497 struct list_head *iter;
1498 struct slave *slave;
1499
1500 if (!bond_has_slaves(bond)) {
1501 bond_info->tx_rebalance_counter = 0;
1502 bond_info->lp_counter = 0;
1503 goto re_arm;
1504 }
1505
1506 rcu_read_lock();
1507
1508 bond_info->tx_rebalance_counter++;
1509 bond_info->lp_counter++;
1510
1511 /* send learning packets */
1512 if (bond_info->lp_counter >= BOND_ALB_LP_TICKS(bond)) {
1513 bool strict_match;
1514
1515 bond_for_each_slave_rcu(bond, slave, iter) {
1516 /* If updating current_active, use all currently
1517 * user mac addreses (!strict_match). Otherwise, only
1518 * use mac of the slave device.
1519 * In RLB mode, we always use strict matches.
1520 */
1521 strict_match = (slave != rcu_access_pointer(bond->curr_active_slave) ||
1522 bond_info->rlb_enabled);
1523 alb_send_learning_packets(slave, slave->dev->dev_addr,
1524 strict_match);
1525 }
1526 bond_info->lp_counter = 0;
1527 }
1528
1529 /* rebalance tx traffic */
1530 if (bond_info->tx_rebalance_counter >= BOND_TLB_REBALANCE_TICKS) {
1531 bond_for_each_slave_rcu(bond, slave, iter) {
1532 tlb_clear_slave(bond, slave, 1);
1533 if (slave == rcu_access_pointer(bond->curr_active_slave)) {
1534 SLAVE_TLB_INFO(slave).load =
1535 bond_info->unbalanced_load /
1536 BOND_TLB_REBALANCE_INTERVAL;
1537 bond_info->unbalanced_load = 0;
1538 }
1539 }
1540 bond_info->tx_rebalance_counter = 0;
1541 }
1542
1543 if (bond_info->rlb_enabled) {
1544 if (bond_info->primary_is_promisc &&
1545 (++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) {
1546
1547 /* dev_set_promiscuity requires rtnl and
1548 * nothing else. Avoid race with bond_close.
1549 */
1550 rcu_read_unlock();
1551 if (!rtnl_trylock())
1552 goto re_arm;
1553
1554 bond_info->rlb_promisc_timeout_counter = 0;
1555
1556 /* If the primary was set to promiscuous mode
1557 * because a slave was disabled then
1558 * it can now leave promiscuous mode.
1559 */
1560 dev_set_promiscuity(rtnl_dereference(bond->curr_active_slave)->dev,
1561 -1);
1562 bond_info->primary_is_promisc = 0;
1563
1564 rtnl_unlock();
1565 rcu_read_lock();
1566 }
1567
1568 if (bond_info->rlb_rebalance) {
1569 bond_info->rlb_rebalance = 0;
1570 rlb_rebalance(bond);
1571 }
1572
1573 /* check if clients need updating */
1574 if (bond_info->rx_ntt) {
1575 if (bond_info->rlb_update_delay_counter) {
1576 --bond_info->rlb_update_delay_counter;
1577 } else {
1578 rlb_update_rx_clients(bond);
1579 if (bond_info->rlb_update_retry_counter)
1580 --bond_info->rlb_update_retry_counter;
1581 else
1582 bond_info->rx_ntt = 0;
1583 }
1584 }
1585 }
1586 rcu_read_unlock();
1587re_arm:
1588 queue_delayed_work(bond->wq, &bond->alb_work, alb_delta_in_ticks);
1589}
1590
1591/* assumption: called before the slave is attached to the bond
1592 * and not locked by the bond lock
1593 */
1594int bond_alb_init_slave(struct bonding *bond, struct slave *slave)
1595{
1596 int res;
1597
1598 res = alb_set_slave_mac_addr(slave, slave->perm_hwaddr,
1599 slave->dev->addr_len);
1600 if (res)
1601 return res;
1602
1603 res = alb_handle_addr_collision_on_attach(bond, slave);
1604 if (res)
1605 return res;
1606
1607 tlb_init_slave(slave);
1608
1609 /* order a rebalance ASAP */
1610 bond->alb_info.tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS;
1611
1612 if (bond->alb_info.rlb_enabled)
1613 bond->alb_info.rlb_rebalance = 1;
1614
1615 return 0;
1616}
1617
1618/* Remove slave from tlb and rlb hash tables, and fix up MAC addresses
1619 * if necessary.
1620 *
1621 * Caller must hold RTNL and no other locks
1622 */
1623void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave)
1624{
1625 if (bond_has_slaves(bond))
1626 alb_change_hw_addr_on_detach(bond, slave);
1627
1628 tlb_clear_slave(bond, slave, 0);
1629
1630 if (bond->alb_info.rlb_enabled) {
1631 bond->alb_info.rx_slave = NULL;
1632 rlb_clear_slave(bond, slave);
1633 }
1634
1635}
1636
1637void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link)
1638{
1639 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1640
1641 if (link == BOND_LINK_DOWN) {
1642 tlb_clear_slave(bond, slave, 0);
1643 if (bond->alb_info.rlb_enabled)
1644 rlb_clear_slave(bond, slave);
1645 } else if (link == BOND_LINK_UP) {
1646 /* order a rebalance ASAP */
1647 bond_info->tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS;
1648 if (bond->alb_info.rlb_enabled) {
1649 bond->alb_info.rlb_rebalance = 1;
1650 /* If the updelay module parameter is smaller than the
1651 * forwarding delay of the switch the rebalance will
1652 * not work because the rebalance arp replies will
1653 * not be forwarded to the clients..
1654 */
1655 }
1656 }
1657
1658 if (bond_is_nondyn_tlb(bond)) {
1659 if (bond_update_slave_arr(bond, NULL))
1660 pr_err("Failed to build slave-array for TLB mode.\n");
1661 }
1662}
1663
1664/**
1665 * bond_alb_handle_active_change - assign new curr_active_slave
1666 * @bond: our bonding struct
1667 * @new_slave: new slave to assign
1668 *
1669 * Set the bond->curr_active_slave to @new_slave and handle
1670 * mac address swapping and promiscuity changes as needed.
1671 *
1672 * Caller must hold RTNL
1673 */
1674void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave)
1675{
1676 struct slave *swap_slave;
1677 struct slave *curr_active;
1678
1679 curr_active = rtnl_dereference(bond->curr_active_slave);
1680 if (curr_active == new_slave)
1681 return;
1682
1683 if (curr_active && bond->alb_info.primary_is_promisc) {
1684 dev_set_promiscuity(curr_active->dev, -1);
1685 bond->alb_info.primary_is_promisc = 0;
1686 bond->alb_info.rlb_promisc_timeout_counter = 0;
1687 }
1688
1689 swap_slave = curr_active;
1690 rcu_assign_pointer(bond->curr_active_slave, new_slave);
1691
1692 if (!new_slave || !bond_has_slaves(bond))
1693 return;
1694
1695 /* set the new curr_active_slave to the bonds mac address
1696 * i.e. swap mac addresses of old curr_active_slave and new curr_active_slave
1697 */
1698 if (!swap_slave)
1699 swap_slave = bond_slave_has_mac(bond, bond->dev->dev_addr);
1700
1701 /* Arrange for swap_slave and new_slave to temporarily be
1702 * ignored so we can mess with their MAC addresses without
1703 * fear of interference from transmit activity.
1704 */
1705 if (swap_slave)
1706 tlb_clear_slave(bond, swap_slave, 1);
1707 tlb_clear_slave(bond, new_slave, 1);
1708
1709 /* in TLB mode, the slave might flip down/up with the old dev_addr,
1710 * and thus filter bond->dev_addr's packets, so force bond's mac
1711 */
1712 if (BOND_MODE(bond) == BOND_MODE_TLB) {
1713 struct sockaddr_storage ss;
1714 u8 tmp_addr[MAX_ADDR_LEN];
1715
1716 bond_hw_addr_copy(tmp_addr, new_slave->dev->dev_addr,
1717 new_slave->dev->addr_len);
1718
1719 bond_hw_addr_copy(ss.__data, bond->dev->dev_addr,
1720 bond->dev->addr_len);
1721 ss.ss_family = bond->dev->type;
1722 /* we don't care if it can't change its mac, best effort */
1723 dev_set_mac_address(new_slave->dev, (struct sockaddr *)&ss);
1724
1725 bond_hw_addr_copy(new_slave->dev->dev_addr, tmp_addr,
1726 new_slave->dev->addr_len);
1727 }
1728
1729 /* curr_active_slave must be set before calling alb_swap_mac_addr */
1730 if (swap_slave) {
1731 /* swap mac address */
1732 alb_swap_mac_addr(swap_slave, new_slave);
1733 alb_fasten_mac_swap(bond, swap_slave, new_slave);
1734 } else {
1735 /* set the new_slave to the bond mac address */
1736 alb_set_slave_mac_addr(new_slave, bond->dev->dev_addr,
1737 bond->dev->addr_len);
1738 alb_send_learning_packets(new_slave, bond->dev->dev_addr,
1739 false);
1740 }
1741}
1742
1743/* Called with RTNL */
1744int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr)
1745{
1746 struct bonding *bond = netdev_priv(bond_dev);
1747 struct sockaddr_storage *ss = addr;
1748 struct slave *curr_active;
1749 struct slave *swap_slave;
1750 int res;
1751
1752 if (!is_valid_ether_addr(ss->__data))
1753 return -EADDRNOTAVAIL;
1754
1755 res = alb_set_mac_address(bond, addr);
1756 if (res)
1757 return res;
1758
1759 bond_hw_addr_copy(bond_dev->dev_addr, ss->__data, bond_dev->addr_len);
1760
1761 /* If there is no curr_active_slave there is nothing else to do.
1762 * Otherwise we'll need to pass the new address to it and handle
1763 * duplications.
1764 */
1765 curr_active = rtnl_dereference(bond->curr_active_slave);
1766 if (!curr_active)
1767 return 0;
1768
1769 swap_slave = bond_slave_has_mac(bond, bond_dev->dev_addr);
1770
1771 if (swap_slave) {
1772 alb_swap_mac_addr(swap_slave, curr_active);
1773 alb_fasten_mac_swap(bond, swap_slave, curr_active);
1774 } else {
1775 alb_set_slave_mac_addr(curr_active, bond_dev->dev_addr,
1776 bond_dev->addr_len);
1777
1778 alb_send_learning_packets(curr_active,
1779 bond_dev->dev_addr, false);
1780 if (bond->alb_info.rlb_enabled) {
1781 /* inform clients mac address has changed */
1782 rlb_req_update_slave_clients(bond, curr_active);
1783 }
1784 }
1785
1786 return 0;
1787}
1788
1789void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
1790{
1791 if (bond->alb_info.rlb_enabled)
1792 rlb_clear_vlan(bond, vlan_id);
1793}
1794
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
23
24#include <linux/skbuff.h>
25#include <linux/netdevice.h>
26#include <linux/etherdevice.h>
27#include <linux/pkt_sched.h>
28#include <linux/spinlock.h>
29#include <linux/slab.h>
30#include <linux/timer.h>
31#include <linux/ip.h>
32#include <linux/ipv6.h>
33#include <linux/if_arp.h>
34#include <linux/if_ether.h>
35#include <linux/if_bonding.h>
36#include <linux/if_vlan.h>
37#include <linux/in.h>
38#include <net/ipx.h>
39#include <net/arp.h>
40#include <net/ipv6.h>
41#include <asm/byteorder.h>
42#include "bonding.h"
43#include "bond_alb.h"
44
45
46
47#ifndef __long_aligned
48#define __long_aligned __attribute__((aligned((sizeof(long)))))
49#endif
50static const u8 mac_bcast[ETH_ALEN] __long_aligned = {
51 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
52};
53static const u8 mac_v6_allmcast[ETH_ALEN] __long_aligned = {
54 0x33, 0x33, 0x00, 0x00, 0x00, 0x01
55};
56static const int alb_delta_in_ticks = HZ / ALB_TIMER_TICKS_PER_SEC;
57
58#pragma pack(1)
59struct learning_pkt {
60 u8 mac_dst[ETH_ALEN];
61 u8 mac_src[ETH_ALEN];
62 __be16 type;
63 u8 padding[ETH_ZLEN - ETH_HLEN];
64};
65
66struct arp_pkt {
67 __be16 hw_addr_space;
68 __be16 prot_addr_space;
69 u8 hw_addr_len;
70 u8 prot_addr_len;
71 __be16 op_code;
72 u8 mac_src[ETH_ALEN]; /* sender hardware address */
73 __be32 ip_src; /* sender IP address */
74 u8 mac_dst[ETH_ALEN]; /* target hardware address */
75 __be32 ip_dst; /* target IP address */
76};
77#pragma pack()
78
79static inline struct arp_pkt *arp_pkt(const struct sk_buff *skb)
80{
81 return (struct arp_pkt *)skb_network_header(skb);
82}
83
84/* Forward declaration */
85static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[],
86 bool strict_match);
87static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp);
88static void rlb_src_unlink(struct bonding *bond, u32 index);
89static void rlb_src_link(struct bonding *bond, u32 ip_src_hash,
90 u32 ip_dst_hash);
91
92static inline u8 _simple_hash(const u8 *hash_start, int hash_size)
93{
94 int i;
95 u8 hash = 0;
96
97 for (i = 0; i < hash_size; i++)
98 hash ^= hash_start[i];
99
100 return hash;
101}
102
103/*********************** tlb specific functions ***************************/
104
105static inline void _lock_tx_hashtbl_bh(struct bonding *bond)
106{
107 spin_lock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock));
108}
109
110static inline void _unlock_tx_hashtbl_bh(struct bonding *bond)
111{
112 spin_unlock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock));
113}
114
115static inline void _lock_tx_hashtbl(struct bonding *bond)
116{
117 spin_lock(&(BOND_ALB_INFO(bond).tx_hashtbl_lock));
118}
119
120static inline void _unlock_tx_hashtbl(struct bonding *bond)
121{
122 spin_unlock(&(BOND_ALB_INFO(bond).tx_hashtbl_lock));
123}
124
125/* Caller must hold tx_hashtbl lock */
126static inline void tlb_init_table_entry(struct tlb_client_info *entry, int save_load)
127{
128 if (save_load) {
129 entry->load_history = 1 + entry->tx_bytes /
130 BOND_TLB_REBALANCE_INTERVAL;
131 entry->tx_bytes = 0;
132 }
133
134 entry->tx_slave = NULL;
135 entry->next = TLB_NULL_INDEX;
136 entry->prev = TLB_NULL_INDEX;
137}
138
139static inline void tlb_init_slave(struct slave *slave)
140{
141 SLAVE_TLB_INFO(slave).load = 0;
142 SLAVE_TLB_INFO(slave).head = TLB_NULL_INDEX;
143}
144
145/* Caller must hold bond lock for read, BH disabled */
146static void __tlb_clear_slave(struct bonding *bond, struct slave *slave,
147 int save_load)
148{
149 struct tlb_client_info *tx_hash_table;
150 u32 index;
151
152 /* clear slave from tx_hashtbl */
153 tx_hash_table = BOND_ALB_INFO(bond).tx_hashtbl;
154
155 /* skip this if we've already freed the tx hash table */
156 if (tx_hash_table) {
157 index = SLAVE_TLB_INFO(slave).head;
158 while (index != TLB_NULL_INDEX) {
159 u32 next_index = tx_hash_table[index].next;
160 tlb_init_table_entry(&tx_hash_table[index], save_load);
161 index = next_index;
162 }
163 }
164
165 tlb_init_slave(slave);
166}
167
168/* Caller must hold bond lock for read */
169static void tlb_clear_slave(struct bonding *bond, struct slave *slave,
170 int save_load)
171{
172 _lock_tx_hashtbl_bh(bond);
173 __tlb_clear_slave(bond, slave, save_load);
174 _unlock_tx_hashtbl_bh(bond);
175}
176
177/* Must be called before starting the monitor timer */
178static int tlb_initialize(struct bonding *bond)
179{
180 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
181 int size = TLB_HASH_TABLE_SIZE * sizeof(struct tlb_client_info);
182 struct tlb_client_info *new_hashtbl;
183 int i;
184
185 new_hashtbl = kzalloc(size, GFP_KERNEL);
186 if (!new_hashtbl)
187 return -1;
188
189 _lock_tx_hashtbl_bh(bond);
190
191 bond_info->tx_hashtbl = new_hashtbl;
192
193 for (i = 0; i < TLB_HASH_TABLE_SIZE; i++)
194 tlb_init_table_entry(&bond_info->tx_hashtbl[i], 0);
195
196 _unlock_tx_hashtbl_bh(bond);
197
198 return 0;
199}
200
201/* Must be called only after all slaves have been released */
202static void tlb_deinitialize(struct bonding *bond)
203{
204 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
205
206 _lock_tx_hashtbl_bh(bond);
207
208 kfree(bond_info->tx_hashtbl);
209 bond_info->tx_hashtbl = NULL;
210
211 _unlock_tx_hashtbl_bh(bond);
212}
213
214static long long compute_gap(struct slave *slave)
215{
216 return (s64) (slave->speed << 20) - /* Convert to Megabit per sec */
217 (s64) (SLAVE_TLB_INFO(slave).load << 3); /* Bytes to bits */
218}
219
220/* Caller must hold bond lock for read */
221static struct slave *tlb_get_least_loaded_slave(struct bonding *bond)
222{
223 struct slave *slave, *least_loaded;
224 struct list_head *iter;
225 long long max_gap;
226
227 least_loaded = NULL;
228 max_gap = LLONG_MIN;
229
230 /* Find the slave with the largest gap */
231 bond_for_each_slave_rcu(bond, slave, iter) {
232 if (SLAVE_IS_OK(slave)) {
233 long long gap = compute_gap(slave);
234
235 if (max_gap < gap) {
236 least_loaded = slave;
237 max_gap = gap;
238 }
239 }
240 }
241
242 return least_loaded;
243}
244
245static struct slave *__tlb_choose_channel(struct bonding *bond, u32 hash_index,
246 u32 skb_len)
247{
248 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
249 struct tlb_client_info *hash_table;
250 struct slave *assigned_slave;
251
252 hash_table = bond_info->tx_hashtbl;
253 assigned_slave = hash_table[hash_index].tx_slave;
254 if (!assigned_slave) {
255 assigned_slave = tlb_get_least_loaded_slave(bond);
256
257 if (assigned_slave) {
258 struct tlb_slave_info *slave_info =
259 &(SLAVE_TLB_INFO(assigned_slave));
260 u32 next_index = slave_info->head;
261
262 hash_table[hash_index].tx_slave = assigned_slave;
263 hash_table[hash_index].next = next_index;
264 hash_table[hash_index].prev = TLB_NULL_INDEX;
265
266 if (next_index != TLB_NULL_INDEX)
267 hash_table[next_index].prev = hash_index;
268
269 slave_info->head = hash_index;
270 slave_info->load +=
271 hash_table[hash_index].load_history;
272 }
273 }
274
275 if (assigned_slave)
276 hash_table[hash_index].tx_bytes += skb_len;
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 ether_addr_copy(client_info->mac_dst, arp->mac_src);
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(const struct sk_buff *skb, struct bonding *bond,
346 struct slave *slave)
347{
348 struct arp_pkt *arp, _arp;
349
350 if (skb->protocol != cpu_to_be16(ETH_P_ARP))
351 goto out;
352
353 arp = skb_header_pointer(skb, 0, sizeof(_arp), &_arp);
354 if (!arp)
355 goto out;
356
357 /* We received an ARP from arp->ip_src.
358 * We might have used this IP address previously (on the bonding host
359 * itself or on a system that is bridged together with the bond).
360 * However, if arp->mac_src is different than what is stored in
361 * rx_hashtbl, some other host is now using the IP and we must prevent
362 * sending out client updates with this IP address and the old MAC
363 * address.
364 * Clean up all hash table entries that have this address as ip_src but
365 * have a different mac_src.
366 */
367 rlb_purge_src_ip(bond, arp);
368
369 if (arp->op_code == htons(ARPOP_REPLY)) {
370 /* update rx hash table for this ARP */
371 rlb_update_entry_from_arp(bond, arp);
372 pr_debug("Server received an ARP Reply from client\n");
373 }
374out:
375 return RX_HANDLER_ANOTHER;
376}
377
378/* Caller must hold bond lock for read */
379static struct slave *rlb_next_rx_slave(struct bonding *bond)
380{
381 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
382 struct slave *before = NULL, *rx_slave = NULL, *slave;
383 struct list_head *iter;
384 bool found = false;
385
386 bond_for_each_slave(bond, slave, iter) {
387 if (!SLAVE_IS_OK(slave))
388 continue;
389 if (!found) {
390 if (!before || before->speed < slave->speed)
391 before = slave;
392 } else {
393 if (!rx_slave || rx_slave->speed < slave->speed)
394 rx_slave = slave;
395 }
396 if (slave == bond_info->rx_slave)
397 found = true;
398 }
399 /* we didn't find anything after the current or we have something
400 * better before and up to the current slave
401 */
402 if (!rx_slave || (before && rx_slave->speed < before->speed))
403 rx_slave = before;
404
405 if (rx_slave)
406 bond_info->rx_slave = rx_slave;
407
408 return rx_slave;
409}
410
411/* Caller must hold rcu_read_lock() for read */
412static struct slave *__rlb_next_rx_slave(struct bonding *bond)
413{
414 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
415 struct slave *before = NULL, *rx_slave = NULL, *slave;
416 struct list_head *iter;
417 bool found = false;
418
419 bond_for_each_slave_rcu(bond, slave, iter) {
420 if (!SLAVE_IS_OK(slave))
421 continue;
422 if (!found) {
423 if (!before || before->speed < slave->speed)
424 before = slave;
425 } else {
426 if (!rx_slave || rx_slave->speed < slave->speed)
427 rx_slave = slave;
428 }
429 if (slave == bond_info->rx_slave)
430 found = true;
431 }
432 /* we didn't find anything after the current or we have something
433 * better before and up to the current slave
434 */
435 if (!rx_slave || (before && rx_slave->speed < before->speed))
436 rx_slave = before;
437
438 if (rx_slave)
439 bond_info->rx_slave = rx_slave;
440
441 return rx_slave;
442}
443
444/* teach the switch the mac of a disabled slave
445 * on the primary for fault tolerance
446 *
447 * Caller must hold bond->curr_slave_lock for write or bond lock for write
448 */
449static void rlb_teach_disabled_mac_on_primary(struct bonding *bond, u8 addr[])
450{
451 if (!bond->curr_active_slave)
452 return;
453
454 if (!bond->alb_info.primary_is_promisc) {
455 if (!dev_set_promiscuity(bond->curr_active_slave->dev, 1))
456 bond->alb_info.primary_is_promisc = 1;
457 else
458 bond->alb_info.primary_is_promisc = 0;
459 }
460
461 bond->alb_info.rlb_promisc_timeout_counter = 0;
462
463 alb_send_learning_packets(bond->curr_active_slave, addr, true);
464}
465
466/* slave being removed should not be active at this point
467 *
468 * Caller must hold rtnl.
469 */
470static void rlb_clear_slave(struct bonding *bond, struct slave *slave)
471{
472 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
473 struct rlb_client_info *rx_hash_table;
474 u32 index, next_index;
475
476 /* clear slave from rx_hashtbl */
477 _lock_rx_hashtbl_bh(bond);
478
479 rx_hash_table = bond_info->rx_hashtbl;
480 index = bond_info->rx_hashtbl_used_head;
481 for (; index != RLB_NULL_INDEX; index = next_index) {
482 next_index = rx_hash_table[index].used_next;
483 if (rx_hash_table[index].slave == slave) {
484 struct slave *assigned_slave = rlb_next_rx_slave(bond);
485
486 if (assigned_slave) {
487 rx_hash_table[index].slave = assigned_slave;
488 if (!ether_addr_equal_64bits(rx_hash_table[index].mac_dst,
489 mac_bcast)) {
490 bond_info->rx_hashtbl[index].ntt = 1;
491 bond_info->rx_ntt = 1;
492 /* A slave has been removed from the
493 * table because it is either disabled
494 * or being released. We must retry the
495 * update to avoid clients from not
496 * being updated & disconnecting when
497 * there is stress
498 */
499 bond_info->rlb_update_retry_counter =
500 RLB_UPDATE_RETRY;
501 }
502 } else { /* there is no active slave */
503 rx_hash_table[index].slave = NULL;
504 }
505 }
506 }
507
508 _unlock_rx_hashtbl_bh(bond);
509
510 write_lock_bh(&bond->curr_slave_lock);
511
512 if (slave != bond->curr_active_slave)
513 rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr);
514
515 write_unlock_bh(&bond->curr_slave_lock);
516}
517
518static void rlb_update_client(struct rlb_client_info *client_info)
519{
520 int i;
521
522 if (!client_info->slave)
523 return;
524
525 for (i = 0; i < RLB_ARP_BURST_SIZE; i++) {
526 struct sk_buff *skb;
527
528 skb = arp_create(ARPOP_REPLY, ETH_P_ARP,
529 client_info->ip_dst,
530 client_info->slave->dev,
531 client_info->ip_src,
532 client_info->mac_dst,
533 client_info->slave->dev->dev_addr,
534 client_info->mac_dst);
535 if (!skb) {
536 pr_err("%s: Error: failed to create an ARP packet\n",
537 client_info->slave->bond->dev->name);
538 continue;
539 }
540
541 skb->dev = client_info->slave->dev;
542
543 if (client_info->vlan_id) {
544 skb = vlan_put_tag(skb, htons(ETH_P_8021Q), client_info->vlan_id);
545 if (!skb) {
546 pr_err("%s: Error: failed to insert VLAN tag\n",
547 client_info->slave->bond->dev->name);
548 continue;
549 }
550 }
551
552 arp_xmit(skb);
553 }
554}
555
556/* sends ARP REPLIES that update the clients that need updating */
557static void rlb_update_rx_clients(struct bonding *bond)
558{
559 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
560 struct rlb_client_info *client_info;
561 u32 hash_index;
562
563 _lock_rx_hashtbl_bh(bond);
564
565 hash_index = bond_info->rx_hashtbl_used_head;
566 for (; hash_index != RLB_NULL_INDEX;
567 hash_index = client_info->used_next) {
568 client_info = &(bond_info->rx_hashtbl[hash_index]);
569 if (client_info->ntt) {
570 rlb_update_client(client_info);
571 if (bond_info->rlb_update_retry_counter == 0)
572 client_info->ntt = 0;
573 }
574 }
575
576 /* do not update the entries again until this counter is zero so that
577 * not to confuse the clients.
578 */
579 bond_info->rlb_update_delay_counter = RLB_UPDATE_DELAY;
580
581 _unlock_rx_hashtbl_bh(bond);
582}
583
584/* The slave was assigned a new mac address - update the clients */
585static void rlb_req_update_slave_clients(struct bonding *bond, struct slave *slave)
586{
587 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
588 struct rlb_client_info *client_info;
589 int ntt = 0;
590 u32 hash_index;
591
592 _lock_rx_hashtbl_bh(bond);
593
594 hash_index = bond_info->rx_hashtbl_used_head;
595 for (; hash_index != RLB_NULL_INDEX;
596 hash_index = client_info->used_next) {
597 client_info = &(bond_info->rx_hashtbl[hash_index]);
598
599 if ((client_info->slave == slave) &&
600 !ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) {
601 client_info->ntt = 1;
602 ntt = 1;
603 }
604 }
605
606 /* update the team's flag only after the whole iteration */
607 if (ntt) {
608 bond_info->rx_ntt = 1;
609 /* fasten the change */
610 bond_info->rlb_update_retry_counter = RLB_UPDATE_RETRY;
611 }
612
613 _unlock_rx_hashtbl_bh(bond);
614}
615
616/* mark all clients using src_ip to be updated */
617static void rlb_req_update_subnet_clients(struct bonding *bond, __be32 src_ip)
618{
619 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
620 struct rlb_client_info *client_info;
621 u32 hash_index;
622
623 _lock_rx_hashtbl(bond);
624
625 hash_index = bond_info->rx_hashtbl_used_head;
626 for (; hash_index != RLB_NULL_INDEX;
627 hash_index = client_info->used_next) {
628 client_info = &(bond_info->rx_hashtbl[hash_index]);
629
630 if (!client_info->slave) {
631 pr_err("%s: Error: found a client with no channel in the client's hash table\n",
632 bond->dev->name);
633 continue;
634 }
635 /*update all clients using this src_ip, that are not assigned
636 * to the team's address (curr_active_slave) and have a known
637 * unicast mac address.
638 */
639 if ((client_info->ip_src == src_ip) &&
640 !ether_addr_equal_64bits(client_info->slave->dev->dev_addr,
641 bond->dev->dev_addr) &&
642 !ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) {
643 client_info->ntt = 1;
644 bond_info->rx_ntt = 1;
645 }
646 }
647
648 _unlock_rx_hashtbl(bond);
649}
650
651/* Caller must hold both bond and ptr locks for read */
652static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bond)
653{
654 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
655 struct arp_pkt *arp = arp_pkt(skb);
656 struct slave *assigned_slave, *curr_active_slave;
657 struct rlb_client_info *client_info;
658 u32 hash_index = 0;
659
660 _lock_rx_hashtbl(bond);
661
662 curr_active_slave = rcu_dereference(bond->curr_active_slave);
663
664 hash_index = _simple_hash((u8 *)&arp->ip_dst, sizeof(arp->ip_dst));
665 client_info = &(bond_info->rx_hashtbl[hash_index]);
666
667 if (client_info->assigned) {
668 if ((client_info->ip_src == arp->ip_src) &&
669 (client_info->ip_dst == arp->ip_dst)) {
670 /* the entry is already assigned to this client */
671 if (!ether_addr_equal_64bits(arp->mac_dst, mac_bcast)) {
672 /* update mac address from arp */
673 ether_addr_copy(client_info->mac_dst, arp->mac_dst);
674 }
675 ether_addr_copy(client_info->mac_src, arp->mac_src);
676
677 assigned_slave = client_info->slave;
678 if (assigned_slave) {
679 _unlock_rx_hashtbl(bond);
680 return assigned_slave;
681 }
682 } else {
683 /* the entry is already assigned to some other client,
684 * move the old client to primary (curr_active_slave) so
685 * that the new client can be assigned to this entry.
686 */
687 if (bond->curr_active_slave &&
688 client_info->slave != curr_active_slave) {
689 client_info->slave = curr_active_slave;
690 rlb_update_client(client_info);
691 }
692 }
693 }
694 /* assign a new slave */
695 assigned_slave = __rlb_next_rx_slave(bond);
696
697 if (assigned_slave) {
698 if (!(client_info->assigned &&
699 client_info->ip_src == arp->ip_src)) {
700 /* ip_src is going to be updated,
701 * fix the src hash list
702 */
703 u32 hash_src = _simple_hash((u8 *)&arp->ip_src,
704 sizeof(arp->ip_src));
705 rlb_src_unlink(bond, hash_index);
706 rlb_src_link(bond, hash_src, hash_index);
707 }
708
709 client_info->ip_src = arp->ip_src;
710 client_info->ip_dst = arp->ip_dst;
711 /* arp->mac_dst is broadcast for arp reqeusts.
712 * will be updated with clients actual unicast mac address
713 * upon receiving an arp reply.
714 */
715 ether_addr_copy(client_info->mac_dst, arp->mac_dst);
716 ether_addr_copy(client_info->mac_src, arp->mac_src);
717 client_info->slave = assigned_slave;
718
719 if (!ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) {
720 client_info->ntt = 1;
721 bond->alb_info.rx_ntt = 1;
722 } else {
723 client_info->ntt = 0;
724 }
725
726 if (vlan_get_tag(skb, &client_info->vlan_id))
727 client_info->vlan_id = 0;
728
729 if (!client_info->assigned) {
730 u32 prev_tbl_head = bond_info->rx_hashtbl_used_head;
731 bond_info->rx_hashtbl_used_head = hash_index;
732 client_info->used_next = prev_tbl_head;
733 if (prev_tbl_head != RLB_NULL_INDEX) {
734 bond_info->rx_hashtbl[prev_tbl_head].used_prev =
735 hash_index;
736 }
737 client_info->assigned = 1;
738 }
739 }
740
741 _unlock_rx_hashtbl(bond);
742
743 return assigned_slave;
744}
745
746/* chooses (and returns) transmit channel for arp reply
747 * does not choose channel for other arp types since they are
748 * sent on the curr_active_slave
749 */
750static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond)
751{
752 struct arp_pkt *arp = arp_pkt(skb);
753 struct slave *tx_slave = NULL;
754
755 /* Don't modify or load balance ARPs that do not originate locally
756 * (e.g.,arrive via a bridge).
757 */
758 if (!bond_slave_has_mac_rcu(bond, arp->mac_src))
759 return NULL;
760
761 if (arp->op_code == htons(ARPOP_REPLY)) {
762 /* the arp must be sent on the selected
763 * rx channel
764 */
765 tx_slave = rlb_choose_channel(skb, bond);
766 if (tx_slave)
767 ether_addr_copy(arp->mac_src, tx_slave->dev->dev_addr);
768 pr_debug("Server sent ARP Reply packet\n");
769 } else if (arp->op_code == htons(ARPOP_REQUEST)) {
770 /* Create an entry in the rx_hashtbl for this client as a
771 * place holder.
772 * When the arp reply is received the entry will be updated
773 * with the correct unicast address of the client.
774 */
775 rlb_choose_channel(skb, bond);
776
777 /* The ARP reply packets must be delayed so that
778 * they can cancel out the influence of the ARP request.
779 */
780 bond->alb_info.rlb_update_delay_counter = RLB_UPDATE_DELAY;
781
782 /* arp requests are broadcast and are sent on the primary
783 * the arp request will collapse all clients on the subnet to
784 * the primary slave. We must register these clients to be
785 * updated with their assigned mac.
786 */
787 rlb_req_update_subnet_clients(bond, arp->ip_src);
788 pr_debug("Server sent ARP Request packet\n");
789 }
790
791 return tx_slave;
792}
793
794/* Caller must hold bond lock for read */
795static void rlb_rebalance(struct bonding *bond)
796{
797 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
798 struct slave *assigned_slave;
799 struct rlb_client_info *client_info;
800 int ntt;
801 u32 hash_index;
802
803 _lock_rx_hashtbl_bh(bond);
804
805 ntt = 0;
806 hash_index = bond_info->rx_hashtbl_used_head;
807 for (; hash_index != RLB_NULL_INDEX;
808 hash_index = client_info->used_next) {
809 client_info = &(bond_info->rx_hashtbl[hash_index]);
810 assigned_slave = __rlb_next_rx_slave(bond);
811 if (assigned_slave && (client_info->slave != assigned_slave)) {
812 client_info->slave = assigned_slave;
813 client_info->ntt = 1;
814 ntt = 1;
815 }
816 }
817
818 /* update the team's flag only after the whole iteration */
819 if (ntt)
820 bond_info->rx_ntt = 1;
821 _unlock_rx_hashtbl_bh(bond);
822}
823
824/* Caller must hold rx_hashtbl lock */
825static void rlb_init_table_entry_dst(struct rlb_client_info *entry)
826{
827 entry->used_next = RLB_NULL_INDEX;
828 entry->used_prev = RLB_NULL_INDEX;
829 entry->assigned = 0;
830 entry->slave = NULL;
831 entry->vlan_id = 0;
832}
833static void rlb_init_table_entry_src(struct rlb_client_info *entry)
834{
835 entry->src_first = RLB_NULL_INDEX;
836 entry->src_prev = RLB_NULL_INDEX;
837 entry->src_next = RLB_NULL_INDEX;
838}
839
840static void rlb_init_table_entry(struct rlb_client_info *entry)
841{
842 memset(entry, 0, sizeof(struct rlb_client_info));
843 rlb_init_table_entry_dst(entry);
844 rlb_init_table_entry_src(entry);
845}
846
847static void rlb_delete_table_entry_dst(struct bonding *bond, u32 index)
848{
849 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
850 u32 next_index = bond_info->rx_hashtbl[index].used_next;
851 u32 prev_index = bond_info->rx_hashtbl[index].used_prev;
852
853 if (index == bond_info->rx_hashtbl_used_head)
854 bond_info->rx_hashtbl_used_head = next_index;
855 if (prev_index != RLB_NULL_INDEX)
856 bond_info->rx_hashtbl[prev_index].used_next = next_index;
857 if (next_index != RLB_NULL_INDEX)
858 bond_info->rx_hashtbl[next_index].used_prev = prev_index;
859}
860
861/* unlink a rlb hash table entry from the src list */
862static void rlb_src_unlink(struct bonding *bond, u32 index)
863{
864 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
865 u32 next_index = bond_info->rx_hashtbl[index].src_next;
866 u32 prev_index = bond_info->rx_hashtbl[index].src_prev;
867
868 bond_info->rx_hashtbl[index].src_next = RLB_NULL_INDEX;
869 bond_info->rx_hashtbl[index].src_prev = RLB_NULL_INDEX;
870
871 if (next_index != RLB_NULL_INDEX)
872 bond_info->rx_hashtbl[next_index].src_prev = prev_index;
873
874 if (prev_index == RLB_NULL_INDEX)
875 return;
876
877 /* is prev_index pointing to the head of this list? */
878 if (bond_info->rx_hashtbl[prev_index].src_first == index)
879 bond_info->rx_hashtbl[prev_index].src_first = next_index;
880 else
881 bond_info->rx_hashtbl[prev_index].src_next = next_index;
882
883}
884
885static void rlb_delete_table_entry(struct bonding *bond, u32 index)
886{
887 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
888 struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]);
889
890 rlb_delete_table_entry_dst(bond, index);
891 rlb_init_table_entry_dst(entry);
892
893 rlb_src_unlink(bond, index);
894}
895
896/* add the rx_hashtbl[ip_dst_hash] entry to the list
897 * of entries with identical ip_src_hash
898 */
899static void rlb_src_link(struct bonding *bond, u32 ip_src_hash, u32 ip_dst_hash)
900{
901 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
902 u32 next;
903
904 bond_info->rx_hashtbl[ip_dst_hash].src_prev = ip_src_hash;
905 next = bond_info->rx_hashtbl[ip_src_hash].src_first;
906 bond_info->rx_hashtbl[ip_dst_hash].src_next = next;
907 if (next != RLB_NULL_INDEX)
908 bond_info->rx_hashtbl[next].src_prev = ip_dst_hash;
909 bond_info->rx_hashtbl[ip_src_hash].src_first = ip_dst_hash;
910}
911
912/* deletes all rx_hashtbl entries with arp->ip_src if their mac_src does
913 * not match arp->mac_src */
914static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp)
915{
916 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
917 u32 ip_src_hash = _simple_hash((u8 *)&(arp->ip_src), sizeof(arp->ip_src));
918 u32 index;
919
920 _lock_rx_hashtbl_bh(bond);
921
922 index = bond_info->rx_hashtbl[ip_src_hash].src_first;
923 while (index != RLB_NULL_INDEX) {
924 struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]);
925 u32 next_index = entry->src_next;
926 if (entry->ip_src == arp->ip_src &&
927 !ether_addr_equal_64bits(arp->mac_src, entry->mac_src))
928 rlb_delete_table_entry(bond, index);
929 index = next_index;
930 }
931 _unlock_rx_hashtbl_bh(bond);
932}
933
934static int rlb_initialize(struct bonding *bond)
935{
936 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
937 struct rlb_client_info *new_hashtbl;
938 int size = RLB_HASH_TABLE_SIZE * sizeof(struct rlb_client_info);
939 int i;
940
941 new_hashtbl = kmalloc(size, GFP_KERNEL);
942 if (!new_hashtbl)
943 return -1;
944
945 _lock_rx_hashtbl_bh(bond);
946
947 bond_info->rx_hashtbl = new_hashtbl;
948
949 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
950
951 for (i = 0; i < RLB_HASH_TABLE_SIZE; i++)
952 rlb_init_table_entry(bond_info->rx_hashtbl + i);
953
954 _unlock_rx_hashtbl_bh(bond);
955
956 /* register to receive ARPs */
957 bond->recv_probe = rlb_arp_recv;
958
959 return 0;
960}
961
962static void rlb_deinitialize(struct bonding *bond)
963{
964 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
965
966 _lock_rx_hashtbl_bh(bond);
967
968 kfree(bond_info->rx_hashtbl);
969 bond_info->rx_hashtbl = NULL;
970 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
971
972 _unlock_rx_hashtbl_bh(bond);
973}
974
975static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
976{
977 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
978 u32 curr_index;
979
980 _lock_rx_hashtbl_bh(bond);
981
982 curr_index = bond_info->rx_hashtbl_used_head;
983 while (curr_index != RLB_NULL_INDEX) {
984 struct rlb_client_info *curr = &(bond_info->rx_hashtbl[curr_index]);
985 u32 next_index = bond_info->rx_hashtbl[curr_index].used_next;
986
987 if (curr->vlan_id == vlan_id)
988 rlb_delete_table_entry(bond, curr_index);
989
990 curr_index = next_index;
991 }
992
993 _unlock_rx_hashtbl_bh(bond);
994}
995
996/*********************** tlb/rlb shared functions *********************/
997
998static void alb_send_lp_vid(struct slave *slave, u8 mac_addr[],
999 __be16 vlan_proto, u16 vid)
1000{
1001 struct learning_pkt pkt;
1002 struct sk_buff *skb;
1003 int size = sizeof(struct learning_pkt);
1004 char *data;
1005
1006 memset(&pkt, 0, size);
1007 ether_addr_copy(pkt.mac_dst, mac_addr);
1008 ether_addr_copy(pkt.mac_src, mac_addr);
1009 pkt.type = cpu_to_be16(ETH_P_LOOPBACK);
1010
1011 skb = dev_alloc_skb(size);
1012 if (!skb)
1013 return;
1014
1015 data = skb_put(skb, size);
1016 memcpy(data, &pkt, size);
1017
1018 skb_reset_mac_header(skb);
1019 skb->network_header = skb->mac_header + ETH_HLEN;
1020 skb->protocol = pkt.type;
1021 skb->priority = TC_PRIO_CONTROL;
1022 skb->dev = slave->dev;
1023
1024 if (vid) {
1025 skb = vlan_put_tag(skb, vlan_proto, vid);
1026 if (!skb) {
1027 pr_err("%s: Error: failed to insert VLAN tag\n",
1028 slave->bond->dev->name);
1029 return;
1030 }
1031 }
1032
1033 dev_queue_xmit(skb);
1034}
1035
1036static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[],
1037 bool strict_match)
1038{
1039 struct bonding *bond = bond_get_bond_by_slave(slave);
1040 struct net_device *upper;
1041 struct list_head *iter;
1042
1043 /* send untagged */
1044 alb_send_lp_vid(slave, mac_addr, 0, 0);
1045
1046 /* loop through vlans and send one packet for each */
1047 rcu_read_lock();
1048 netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) {
1049 if (is_vlan_dev(upper) && vlan_get_encap_level(upper) == 0) {
1050 if (strict_match &&
1051 ether_addr_equal_64bits(mac_addr,
1052 upper->dev_addr)) {
1053 alb_send_lp_vid(slave, mac_addr,
1054 vlan_dev_vlan_proto(upper),
1055 vlan_dev_vlan_id(upper));
1056 } else if (!strict_match) {
1057 alb_send_lp_vid(slave, upper->dev_addr,
1058 vlan_dev_vlan_proto(upper),
1059 vlan_dev_vlan_id(upper));
1060 }
1061 }
1062 }
1063 rcu_read_unlock();
1064}
1065
1066static int alb_set_slave_mac_addr(struct slave *slave, u8 addr[])
1067{
1068 struct net_device *dev = slave->dev;
1069 struct sockaddr s_addr;
1070
1071 if (slave->bond->params.mode == BOND_MODE_TLB) {
1072 memcpy(dev->dev_addr, addr, dev->addr_len);
1073 return 0;
1074 }
1075
1076 /* for rlb each slave must have a unique hw mac addresses so that */
1077 /* each slave will receive packets destined to a different mac */
1078 memcpy(s_addr.sa_data, addr, dev->addr_len);
1079 s_addr.sa_family = dev->type;
1080 if (dev_set_mac_address(dev, &s_addr)) {
1081 pr_err("%s: Error: dev_set_mac_address of dev %s failed!\n"
1082 "ALB mode requires that the base driver support setting the hw address also when the network device's interface is open\n",
1083 slave->bond->dev->name, dev->name);
1084 return -EOPNOTSUPP;
1085 }
1086 return 0;
1087}
1088
1089/*
1090 * Swap MAC addresses between two slaves.
1091 *
1092 * Called with RTNL held, and no other locks.
1093 *
1094 */
1095
1096static void alb_swap_mac_addr(struct slave *slave1, struct slave *slave2)
1097{
1098 u8 tmp_mac_addr[ETH_ALEN];
1099
1100 ether_addr_copy(tmp_mac_addr, slave1->dev->dev_addr);
1101 alb_set_slave_mac_addr(slave1, slave2->dev->dev_addr);
1102 alb_set_slave_mac_addr(slave2, tmp_mac_addr);
1103
1104}
1105
1106/*
1107 * Send learning packets after MAC address swap.
1108 *
1109 * Called with RTNL and no other locks
1110 */
1111static void alb_fasten_mac_swap(struct bonding *bond, struct slave *slave1,
1112 struct slave *slave2)
1113{
1114 int slaves_state_differ = (SLAVE_IS_OK(slave1) != SLAVE_IS_OK(slave2));
1115 struct slave *disabled_slave = NULL;
1116
1117 ASSERT_RTNL();
1118
1119 /* fasten the change in the switch */
1120 if (SLAVE_IS_OK(slave1)) {
1121 alb_send_learning_packets(slave1, slave1->dev->dev_addr, false);
1122 if (bond->alb_info.rlb_enabled) {
1123 /* inform the clients that the mac address
1124 * has changed
1125 */
1126 rlb_req_update_slave_clients(bond, slave1);
1127 }
1128 } else {
1129 disabled_slave = slave1;
1130 }
1131
1132 if (SLAVE_IS_OK(slave2)) {
1133 alb_send_learning_packets(slave2, slave2->dev->dev_addr, false);
1134 if (bond->alb_info.rlb_enabled) {
1135 /* inform the clients that the mac address
1136 * has changed
1137 */
1138 rlb_req_update_slave_clients(bond, slave2);
1139 }
1140 } else {
1141 disabled_slave = slave2;
1142 }
1143
1144 if (bond->alb_info.rlb_enabled && slaves_state_differ) {
1145 /* A disabled slave was assigned an active mac addr */
1146 rlb_teach_disabled_mac_on_primary(bond,
1147 disabled_slave->dev->dev_addr);
1148 }
1149}
1150
1151/**
1152 * alb_change_hw_addr_on_detach
1153 * @bond: bonding we're working on
1154 * @slave: the slave that was just detached
1155 *
1156 * We assume that @slave was already detached from the slave list.
1157 *
1158 * If @slave's permanent hw address is different both from its current
1159 * address and from @bond's address, then somewhere in the bond there's
1160 * a slave that has @slave's permanet address as its current address.
1161 * We'll make sure that that slave no longer uses @slave's permanent address.
1162 *
1163 * Caller must hold RTNL and no other locks
1164 */
1165static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *slave)
1166{
1167 int perm_curr_diff;
1168 int perm_bond_diff;
1169 struct slave *found_slave;
1170
1171 perm_curr_diff = !ether_addr_equal_64bits(slave->perm_hwaddr,
1172 slave->dev->dev_addr);
1173 perm_bond_diff = !ether_addr_equal_64bits(slave->perm_hwaddr,
1174 bond->dev->dev_addr);
1175
1176 if (perm_curr_diff && perm_bond_diff) {
1177 found_slave = bond_slave_has_mac(bond, slave->perm_hwaddr);
1178
1179 if (found_slave) {
1180 /* locking: needs RTNL and nothing else */
1181 alb_swap_mac_addr(slave, found_slave);
1182 alb_fasten_mac_swap(bond, slave, found_slave);
1183 }
1184 }
1185}
1186
1187/**
1188 * alb_handle_addr_collision_on_attach
1189 * @bond: bonding we're working on
1190 * @slave: the slave that was just attached
1191 *
1192 * checks uniqueness of slave's mac address and handles the case the
1193 * new slave uses the bonds mac address.
1194 *
1195 * If the permanent hw address of @slave is @bond's hw address, we need to
1196 * find a different hw address to give @slave, that isn't in use by any other
1197 * slave in the bond. This address must be, of course, one of the permanent
1198 * addresses of the other slaves.
1199 *
1200 * We go over the slave list, and for each slave there we compare its
1201 * permanent hw address with the current address of all the other slaves.
1202 * If no match was found, then we've found a slave with a permanent address
1203 * that isn't used by any other slave in the bond, so we can assign it to
1204 * @slave.
1205 *
1206 * assumption: this function is called before @slave is attached to the
1207 * bond slave list.
1208 */
1209static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slave *slave)
1210{
1211 struct slave *has_bond_addr = bond->curr_active_slave;
1212 struct slave *tmp_slave1, *free_mac_slave = NULL;
1213 struct list_head *iter;
1214
1215 if (!bond_has_slaves(bond)) {
1216 /* this is the first slave */
1217 return 0;
1218 }
1219
1220 /* if slave's mac address differs from bond's mac address
1221 * check uniqueness of slave's mac address against the other
1222 * slaves in the bond.
1223 */
1224 if (!ether_addr_equal_64bits(slave->perm_hwaddr, bond->dev->dev_addr)) {
1225 if (!bond_slave_has_mac(bond, slave->dev->dev_addr))
1226 return 0;
1227
1228 /* Try setting slave mac to bond address and fall-through
1229 to code handling that situation below... */
1230 alb_set_slave_mac_addr(slave, bond->dev->dev_addr);
1231 }
1232
1233 /* The slave's address is equal to the address of the bond.
1234 * Search for a spare address in the bond for this slave.
1235 */
1236 bond_for_each_slave(bond, tmp_slave1, iter) {
1237 if (!bond_slave_has_mac(bond, tmp_slave1->perm_hwaddr)) {
1238 /* no slave has tmp_slave1's perm addr
1239 * as its curr addr
1240 */
1241 free_mac_slave = tmp_slave1;
1242 break;
1243 }
1244
1245 if (!has_bond_addr) {
1246 if (ether_addr_equal_64bits(tmp_slave1->dev->dev_addr,
1247 bond->dev->dev_addr)) {
1248
1249 has_bond_addr = tmp_slave1;
1250 }
1251 }
1252 }
1253
1254 if (free_mac_slave) {
1255 alb_set_slave_mac_addr(slave, free_mac_slave->perm_hwaddr);
1256
1257 pr_warn("%s: Warning: the hw address of slave %s is in use by the bond; giving it the hw address of %s\n",
1258 bond->dev->name, slave->dev->name,
1259 free_mac_slave->dev->name);
1260
1261 } else if (has_bond_addr) {
1262 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",
1263 bond->dev->name, slave->dev->name);
1264 return -EFAULT;
1265 }
1266
1267 return 0;
1268}
1269
1270/**
1271 * alb_set_mac_address
1272 * @bond:
1273 * @addr:
1274 *
1275 * In TLB mode all slaves are configured to the bond's hw address, but set
1276 * their dev_addr field to different addresses (based on their permanent hw
1277 * addresses).
1278 *
1279 * For each slave, this function sets the interface to the new address and then
1280 * changes its dev_addr field to its previous value.
1281 *
1282 * Unwinding assumes bond's mac address has not yet changed.
1283 */
1284static int alb_set_mac_address(struct bonding *bond, void *addr)
1285{
1286 struct slave *slave, *rollback_slave;
1287 struct list_head *iter;
1288 struct sockaddr sa;
1289 char tmp_addr[ETH_ALEN];
1290 int res;
1291
1292 if (bond->alb_info.rlb_enabled)
1293 return 0;
1294
1295 bond_for_each_slave(bond, slave, iter) {
1296 /* save net_device's current hw address */
1297 ether_addr_copy(tmp_addr, slave->dev->dev_addr);
1298
1299 res = dev_set_mac_address(slave->dev, addr);
1300
1301 /* restore net_device's hw address */
1302 ether_addr_copy(slave->dev->dev_addr, tmp_addr);
1303
1304 if (res)
1305 goto unwind;
1306 }
1307
1308 return 0;
1309
1310unwind:
1311 memcpy(sa.sa_data, bond->dev->dev_addr, bond->dev->addr_len);
1312 sa.sa_family = bond->dev->type;
1313
1314 /* unwind from head to the slave that failed */
1315 bond_for_each_slave(bond, rollback_slave, iter) {
1316 if (rollback_slave == slave)
1317 break;
1318 ether_addr_copy(tmp_addr, rollback_slave->dev->dev_addr);
1319 dev_set_mac_address(rollback_slave->dev, &sa);
1320 ether_addr_copy(rollback_slave->dev->dev_addr, tmp_addr);
1321 }
1322
1323 return res;
1324}
1325
1326/************************ exported alb funcions ************************/
1327
1328int bond_alb_initialize(struct bonding *bond, int rlb_enabled)
1329{
1330 int res;
1331
1332 res = tlb_initialize(bond);
1333 if (res)
1334 return res;
1335
1336 if (rlb_enabled) {
1337 bond->alb_info.rlb_enabled = 1;
1338 /* initialize rlb */
1339 res = rlb_initialize(bond);
1340 if (res) {
1341 tlb_deinitialize(bond);
1342 return res;
1343 }
1344 } else {
1345 bond->alb_info.rlb_enabled = 0;
1346 }
1347
1348 return 0;
1349}
1350
1351void bond_alb_deinitialize(struct bonding *bond)
1352{
1353 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1354
1355 tlb_deinitialize(bond);
1356
1357 if (bond_info->rlb_enabled)
1358 rlb_deinitialize(bond);
1359}
1360
1361int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
1362{
1363 struct bonding *bond = netdev_priv(bond_dev);
1364 struct ethhdr *eth_data;
1365 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1366 struct slave *tx_slave = NULL;
1367 static const __be32 ip_bcast = htonl(0xffffffff);
1368 int hash_size = 0;
1369 int do_tx_balance = 1;
1370 u32 hash_index = 0;
1371 const u8 *hash_start = NULL;
1372 struct ipv6hdr *ip6hdr;
1373
1374 skb_reset_mac_header(skb);
1375 eth_data = eth_hdr(skb);
1376
1377 switch (ntohs(skb->protocol)) {
1378 case ETH_P_IP: {
1379 const struct iphdr *iph = ip_hdr(skb);
1380
1381 if (ether_addr_equal_64bits(eth_data->h_dest, mac_bcast) ||
1382 (iph->daddr == ip_bcast) ||
1383 (iph->protocol == IPPROTO_IGMP)) {
1384 do_tx_balance = 0;
1385 break;
1386 }
1387 hash_start = (char *)&(iph->daddr);
1388 hash_size = sizeof(iph->daddr);
1389 }
1390 break;
1391 case ETH_P_IPV6:
1392 /* IPv6 doesn't really use broadcast mac address, but leave
1393 * that here just in case.
1394 */
1395 if (ether_addr_equal_64bits(eth_data->h_dest, mac_bcast)) {
1396 do_tx_balance = 0;
1397 break;
1398 }
1399
1400 /* IPv6 uses all-nodes multicast as an equivalent to
1401 * broadcasts in IPv4.
1402 */
1403 if (ether_addr_equal_64bits(eth_data->h_dest, mac_v6_allmcast)) {
1404 do_tx_balance = 0;
1405 break;
1406 }
1407
1408 /* Additianally, DAD probes should not be tx-balanced as that
1409 * will lead to false positives for duplicate addresses and
1410 * prevent address configuration from working.
1411 */
1412 ip6hdr = ipv6_hdr(skb);
1413 if (ipv6_addr_any(&ip6hdr->saddr)) {
1414 do_tx_balance = 0;
1415 break;
1416 }
1417
1418 hash_start = (char *)&(ipv6_hdr(skb)->daddr);
1419 hash_size = sizeof(ipv6_hdr(skb)->daddr);
1420 break;
1421 case ETH_P_IPX:
1422 if (ipx_hdr(skb)->ipx_checksum != IPX_NO_CHECKSUM) {
1423 /* something is wrong with this packet */
1424 do_tx_balance = 0;
1425 break;
1426 }
1427
1428 if (ipx_hdr(skb)->ipx_type != IPX_TYPE_NCP) {
1429 /* The only protocol worth balancing in
1430 * this family since it has an "ARP" like
1431 * mechanism
1432 */
1433 do_tx_balance = 0;
1434 break;
1435 }
1436
1437 hash_start = (char *)eth_data->h_dest;
1438 hash_size = ETH_ALEN;
1439 break;
1440 case ETH_P_ARP:
1441 do_tx_balance = 0;
1442 if (bond_info->rlb_enabled)
1443 tx_slave = rlb_arp_xmit(skb, bond);
1444 break;
1445 default:
1446 do_tx_balance = 0;
1447 break;
1448 }
1449
1450 if (do_tx_balance) {
1451 hash_index = _simple_hash(hash_start, hash_size);
1452 tx_slave = tlb_choose_channel(bond, hash_index, skb->len);
1453 }
1454
1455 if (!tx_slave) {
1456 /* unbalanced or unassigned, send through primary */
1457 tx_slave = rcu_dereference(bond->curr_active_slave);
1458 bond_info->unbalanced_load += skb->len;
1459 }
1460
1461 if (tx_slave && SLAVE_IS_OK(tx_slave)) {
1462 if (tx_slave != rcu_dereference(bond->curr_active_slave)) {
1463 ether_addr_copy(eth_data->h_source,
1464 tx_slave->dev->dev_addr);
1465 }
1466
1467 bond_dev_queue_xmit(bond, skb, tx_slave->dev);
1468 goto out;
1469 }
1470
1471 if (tx_slave) {
1472 _lock_tx_hashtbl(bond);
1473 __tlb_clear_slave(bond, tx_slave, 0);
1474 _unlock_tx_hashtbl(bond);
1475 }
1476
1477 /* no suitable interface, frame not sent */
1478 dev_kfree_skb_any(skb);
1479out:
1480 return NETDEV_TX_OK;
1481}
1482
1483void bond_alb_monitor(struct work_struct *work)
1484{
1485 struct bonding *bond = container_of(work, struct bonding,
1486 alb_work.work);
1487 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1488 struct list_head *iter;
1489 struct slave *slave;
1490
1491 if (!bond_has_slaves(bond)) {
1492 bond_info->tx_rebalance_counter = 0;
1493 bond_info->lp_counter = 0;
1494 goto re_arm;
1495 }
1496
1497 rcu_read_lock();
1498
1499 bond_info->tx_rebalance_counter++;
1500 bond_info->lp_counter++;
1501
1502 /* send learning packets */
1503 if (bond_info->lp_counter >= BOND_ALB_LP_TICKS(bond)) {
1504 bool strict_match;
1505
1506 /* change of curr_active_slave involves swapping of mac addresses.
1507 * in order to avoid this swapping from happening while
1508 * sending the learning packets, the curr_slave_lock must be held for
1509 * read.
1510 */
1511 read_lock(&bond->curr_slave_lock);
1512
1513 bond_for_each_slave_rcu(bond, slave, iter) {
1514 /* If updating current_active, use all currently
1515 * user mac addreses (!strict_match). Otherwise, only
1516 * use mac of the slave device.
1517 */
1518 strict_match = (slave != bond->curr_active_slave);
1519 alb_send_learning_packets(slave, slave->dev->dev_addr,
1520 strict_match);
1521 }
1522
1523 read_unlock(&bond->curr_slave_lock);
1524
1525 bond_info->lp_counter = 0;
1526 }
1527
1528 /* rebalance tx traffic */
1529 if (bond_info->tx_rebalance_counter >= BOND_TLB_REBALANCE_TICKS) {
1530
1531 read_lock(&bond->curr_slave_lock);
1532
1533 bond_for_each_slave_rcu(bond, slave, iter) {
1534 tlb_clear_slave(bond, slave, 1);
1535 if (slave == bond->curr_active_slave) {
1536 SLAVE_TLB_INFO(slave).load =
1537 bond_info->unbalanced_load /
1538 BOND_TLB_REBALANCE_INTERVAL;
1539 bond_info->unbalanced_load = 0;
1540 }
1541 }
1542
1543 read_unlock(&bond->curr_slave_lock);
1544
1545 bond_info->tx_rebalance_counter = 0;
1546 }
1547
1548 /* handle rlb stuff */
1549 if (bond_info->rlb_enabled) {
1550 if (bond_info->primary_is_promisc &&
1551 (++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) {
1552
1553 /*
1554 * dev_set_promiscuity requires rtnl and
1555 * nothing else. Avoid race with bond_close.
1556 */
1557 rcu_read_unlock();
1558 if (!rtnl_trylock())
1559 goto re_arm;
1560
1561 bond_info->rlb_promisc_timeout_counter = 0;
1562
1563 /* If the primary was set to promiscuous mode
1564 * because a slave was disabled then
1565 * it can now leave promiscuous mode.
1566 */
1567 dev_set_promiscuity(bond->curr_active_slave->dev, -1);
1568 bond_info->primary_is_promisc = 0;
1569
1570 rtnl_unlock();
1571 rcu_read_lock();
1572 }
1573
1574 if (bond_info->rlb_rebalance) {
1575 bond_info->rlb_rebalance = 0;
1576 rlb_rebalance(bond);
1577 }
1578
1579 /* check if clients need updating */
1580 if (bond_info->rx_ntt) {
1581 if (bond_info->rlb_update_delay_counter) {
1582 --bond_info->rlb_update_delay_counter;
1583 } else {
1584 rlb_update_rx_clients(bond);
1585 if (bond_info->rlb_update_retry_counter)
1586 --bond_info->rlb_update_retry_counter;
1587 else
1588 bond_info->rx_ntt = 0;
1589 }
1590 }
1591 }
1592 rcu_read_unlock();
1593re_arm:
1594 queue_delayed_work(bond->wq, &bond->alb_work, alb_delta_in_ticks);
1595}
1596
1597/* assumption: called before the slave is attached to the bond
1598 * and not locked by the bond lock
1599 */
1600int bond_alb_init_slave(struct bonding *bond, struct slave *slave)
1601{
1602 int res;
1603
1604 res = alb_set_slave_mac_addr(slave, slave->perm_hwaddr);
1605 if (res)
1606 return res;
1607
1608 res = alb_handle_addr_collision_on_attach(bond, slave);
1609 if (res)
1610 return res;
1611
1612 tlb_init_slave(slave);
1613
1614 /* order a rebalance ASAP */
1615 bond->alb_info.tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS;
1616
1617 if (bond->alb_info.rlb_enabled)
1618 bond->alb_info.rlb_rebalance = 1;
1619
1620 return 0;
1621}
1622
1623/*
1624 * Remove slave from tlb and rlb hash tables, and fix up MAC addresses
1625 * if necessary.
1626 *
1627 * Caller must hold RTNL and no other locks
1628 */
1629void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave)
1630{
1631 if (bond_has_slaves(bond))
1632 alb_change_hw_addr_on_detach(bond, slave);
1633
1634 tlb_clear_slave(bond, slave, 0);
1635
1636 if (bond->alb_info.rlb_enabled) {
1637 bond->alb_info.rx_slave = NULL;
1638 rlb_clear_slave(bond, slave);
1639 }
1640}
1641
1642/* Caller must hold bond lock for read */
1643void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link)
1644{
1645 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1646
1647 if (link == BOND_LINK_DOWN) {
1648 tlb_clear_slave(bond, slave, 0);
1649 if (bond->alb_info.rlb_enabled)
1650 rlb_clear_slave(bond, slave);
1651 } else if (link == BOND_LINK_UP) {
1652 /* order a rebalance ASAP */
1653 bond_info->tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS;
1654 if (bond->alb_info.rlb_enabled) {
1655 bond->alb_info.rlb_rebalance = 1;
1656 /* If the updelay module parameter is smaller than the
1657 * forwarding delay of the switch the rebalance will
1658 * not work because the rebalance arp replies will
1659 * not be forwarded to the clients..
1660 */
1661 }
1662 }
1663}
1664
1665/**
1666 * bond_alb_handle_active_change - assign new curr_active_slave
1667 * @bond: our bonding struct
1668 * @new_slave: new slave to assign
1669 *
1670 * Set the bond->curr_active_slave to @new_slave and handle
1671 * mac address swapping and promiscuity changes as needed.
1672 *
1673 * If new_slave is NULL, caller must hold curr_slave_lock or
1674 * bond->lock for write.
1675 *
1676 * If new_slave is not NULL, caller must hold RTNL, curr_slave_lock
1677 * for write. Processing here may sleep, so no other locks may be held.
1678 */
1679void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave)
1680 __releases(&bond->curr_slave_lock)
1681 __acquires(&bond->curr_slave_lock)
1682{
1683 struct slave *swap_slave;
1684
1685 if (bond->curr_active_slave == new_slave)
1686 return;
1687
1688 if (bond->curr_active_slave && bond->alb_info.primary_is_promisc) {
1689 dev_set_promiscuity(bond->curr_active_slave->dev, -1);
1690 bond->alb_info.primary_is_promisc = 0;
1691 bond->alb_info.rlb_promisc_timeout_counter = 0;
1692 }
1693
1694 swap_slave = bond->curr_active_slave;
1695 rcu_assign_pointer(bond->curr_active_slave, new_slave);
1696
1697 if (!new_slave || !bond_has_slaves(bond))
1698 return;
1699
1700 /* set the new curr_active_slave to the bonds mac address
1701 * i.e. swap mac addresses of old curr_active_slave and new curr_active_slave
1702 */
1703 if (!swap_slave)
1704 swap_slave = bond_slave_has_mac(bond, bond->dev->dev_addr);
1705
1706 /*
1707 * Arrange for swap_slave and new_slave to temporarily be
1708 * ignored so we can mess with their MAC addresses without
1709 * fear of interference from transmit activity.
1710 */
1711 if (swap_slave)
1712 tlb_clear_slave(bond, swap_slave, 1);
1713 tlb_clear_slave(bond, new_slave, 1);
1714
1715 write_unlock_bh(&bond->curr_slave_lock);
1716
1717 ASSERT_RTNL();
1718
1719 /* in TLB mode, the slave might flip down/up with the old dev_addr,
1720 * and thus filter bond->dev_addr's packets, so force bond's mac
1721 */
1722 if (bond->params.mode == BOND_MODE_TLB) {
1723 struct sockaddr sa;
1724 u8 tmp_addr[ETH_ALEN];
1725
1726 ether_addr_copy(tmp_addr, new_slave->dev->dev_addr);
1727
1728 memcpy(sa.sa_data, bond->dev->dev_addr, bond->dev->addr_len);
1729 sa.sa_family = bond->dev->type;
1730 /* we don't care if it can't change its mac, best effort */
1731 dev_set_mac_address(new_slave->dev, &sa);
1732
1733 ether_addr_copy(new_slave->dev->dev_addr, tmp_addr);
1734 }
1735
1736 /* curr_active_slave must be set before calling alb_swap_mac_addr */
1737 if (swap_slave) {
1738 /* swap mac address */
1739 alb_swap_mac_addr(swap_slave, new_slave);
1740 alb_fasten_mac_swap(bond, swap_slave, new_slave);
1741 } else {
1742 /* set the new_slave to the bond mac address */
1743 alb_set_slave_mac_addr(new_slave, bond->dev->dev_addr);
1744 alb_send_learning_packets(new_slave, bond->dev->dev_addr,
1745 false);
1746 }
1747
1748 write_lock_bh(&bond->curr_slave_lock);
1749}
1750
1751/*
1752 * Called with RTNL
1753 */
1754int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr)
1755 __acquires(&bond->lock)
1756 __releases(&bond->lock)
1757{
1758 struct bonding *bond = netdev_priv(bond_dev);
1759 struct sockaddr *sa = addr;
1760 struct slave *swap_slave;
1761 int res;
1762
1763 if (!is_valid_ether_addr(sa->sa_data))
1764 return -EADDRNOTAVAIL;
1765
1766 res = alb_set_mac_address(bond, addr);
1767 if (res)
1768 return res;
1769
1770 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
1771
1772 /* If there is no curr_active_slave there is nothing else to do.
1773 * Otherwise we'll need to pass the new address to it and handle
1774 * duplications.
1775 */
1776 if (!bond->curr_active_slave)
1777 return 0;
1778
1779 swap_slave = bond_slave_has_mac(bond, bond_dev->dev_addr);
1780
1781 if (swap_slave) {
1782 alb_swap_mac_addr(swap_slave, bond->curr_active_slave);
1783 alb_fasten_mac_swap(bond, swap_slave, bond->curr_active_slave);
1784 } else {
1785 alb_set_slave_mac_addr(bond->curr_active_slave, bond_dev->dev_addr);
1786
1787 read_lock(&bond->lock);
1788 alb_send_learning_packets(bond->curr_active_slave,
1789 bond_dev->dev_addr, false);
1790 if (bond->alb_info.rlb_enabled) {
1791 /* inform clients mac address has changed */
1792 rlb_req_update_slave_clients(bond, bond->curr_active_slave);
1793 }
1794 read_unlock(&bond->lock);
1795 }
1796
1797 return 0;
1798}
1799
1800void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
1801{
1802 if (bond->alb_info.rlb_enabled)
1803 rlb_clear_vlan(bond, vlan_id);
1804}
1805