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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 "bonding.h" | |
41 | #include "bond_alb.h" | |
42 | ||
43 | ||
44 | ||
45 | #ifndef __long_aligned | |
46 | #define __long_aligned __attribute__((aligned((sizeof(long))))) | |
47 | #endif | |
48 | static const u8 mac_bcast[ETH_ALEN] __long_aligned = { | |
49 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff | |
50 | }; | |
51 | static const u8 mac_v6_allmcast[ETH_ALEN] __long_aligned = { | |
52 | 0x33, 0x33, 0x00, 0x00, 0x00, 0x01 | |
53 | }; | |
54 | static const int alb_delta_in_ticks = HZ / ALB_TIMER_TICKS_PER_SEC; | |
55 | ||
56 | #pragma pack(1) | |
57 | struct learning_pkt { | |
58 | u8 mac_dst[ETH_ALEN]; | |
59 | u8 mac_src[ETH_ALEN]; | |
60 | __be16 type; | |
61 | u8 padding[ETH_ZLEN - ETH_HLEN]; | |
62 | }; | |
63 | ||
64 | struct arp_pkt { | |
65 | __be16 hw_addr_space; | |
66 | __be16 prot_addr_space; | |
67 | u8 hw_addr_len; | |
68 | u8 prot_addr_len; | |
69 | __be16 op_code; | |
70 | u8 mac_src[ETH_ALEN]; /* sender hardware address */ | |
71 | __be32 ip_src; /* sender IP address */ | |
72 | u8 mac_dst[ETH_ALEN]; /* target hardware address */ | |
73 | __be32 ip_dst; /* target IP address */ | |
74 | }; | |
75 | #pragma pack() | |
76 | ||
77 | static inline struct arp_pkt *arp_pkt(const struct sk_buff *skb) | |
78 | { | |
79 | return (struct arp_pkt *)skb_network_header(skb); | |
80 | } | |
81 | ||
82 | /* Forward declaration */ | |
83 | static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[], | |
84 | bool strict_match); | |
85 | static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp); | |
86 | static void rlb_src_unlink(struct bonding *bond, u32 index); | |
87 | static void rlb_src_link(struct bonding *bond, u32 ip_src_hash, | |
88 | u32 ip_dst_hash); | |
89 | ||
90 | static inline u8 _simple_hash(const u8 *hash_start, int hash_size) | |
91 | { | |
92 | int i; | |
93 | u8 hash = 0; | |
94 | ||
95 | for (i = 0; i < hash_size; i++) | |
96 | hash ^= hash_start[i]; | |
97 | ||
98 | return hash; | |
99 | } | |
100 | ||
101 | /*********************** tlb specific functions ***************************/ | |
102 | ||
103 | static inline void _lock_tx_hashtbl_bh(struct bonding *bond) | |
104 | { | |
105 | spin_lock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock)); | |
106 | } | |
107 | ||
108 | static inline void _unlock_tx_hashtbl_bh(struct bonding *bond) | |
109 | { | |
110 | spin_unlock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock)); | |
111 | } | |
112 | ||
113 | static inline void _lock_tx_hashtbl(struct bonding *bond) | |
114 | { | |
115 | spin_lock(&(BOND_ALB_INFO(bond).tx_hashtbl_lock)); | |
116 | } | |
117 | ||
118 | static inline void _unlock_tx_hashtbl(struct bonding *bond) | |
119 | { | |
120 | spin_unlock(&(BOND_ALB_INFO(bond).tx_hashtbl_lock)); | |
121 | } | |
122 | ||
123 | /* Caller must hold tx_hashtbl lock */ | |
124 | static inline void tlb_init_table_entry(struct tlb_client_info *entry, int save_load) | |
125 | { | |
126 | if (save_load) { | |
127 | entry->load_history = 1 + entry->tx_bytes / | |
128 | BOND_TLB_REBALANCE_INTERVAL; | |
129 | entry->tx_bytes = 0; | |
130 | } | |
131 | ||
132 | entry->tx_slave = NULL; | |
133 | entry->next = TLB_NULL_INDEX; | |
134 | entry->prev = TLB_NULL_INDEX; | |
135 | } | |
136 | ||
137 | static inline void tlb_init_slave(struct slave *slave) | |
138 | { | |
139 | SLAVE_TLB_INFO(slave).load = 0; | |
140 | SLAVE_TLB_INFO(slave).head = TLB_NULL_INDEX; | |
141 | } | |
142 | ||
143 | /* Caller must hold bond lock for read, BH disabled */ | |
144 | static void __tlb_clear_slave(struct bonding *bond, struct slave *slave, | |
145 | int save_load) | |
146 | { | |
147 | struct tlb_client_info *tx_hash_table; | |
148 | u32 index; | |
149 | ||
150 | /* clear slave from tx_hashtbl */ | |
151 | tx_hash_table = BOND_ALB_INFO(bond).tx_hashtbl; | |
152 | ||
153 | /* skip this if we've already freed the tx hash table */ | |
154 | if (tx_hash_table) { | |
155 | index = SLAVE_TLB_INFO(slave).head; | |
156 | while (index != TLB_NULL_INDEX) { | |
157 | u32 next_index = tx_hash_table[index].next; | |
158 | tlb_init_table_entry(&tx_hash_table[index], save_load); | |
159 | index = next_index; | |
160 | } | |
161 | } | |
162 | ||
163 | tlb_init_slave(slave); | |
164 | } | |
165 | ||
166 | /* Caller must hold bond lock for read */ | |
167 | static void tlb_clear_slave(struct bonding *bond, struct slave *slave, | |
168 | int save_load) | |
169 | { | |
170 | _lock_tx_hashtbl_bh(bond); | |
171 | __tlb_clear_slave(bond, slave, save_load); | |
172 | _unlock_tx_hashtbl_bh(bond); | |
173 | } | |
174 | ||
175 | /* Must be called before starting the monitor timer */ | |
176 | static int tlb_initialize(struct bonding *bond) | |
177 | { | |
178 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
179 | int size = TLB_HASH_TABLE_SIZE * sizeof(struct tlb_client_info); | |
180 | struct tlb_client_info *new_hashtbl; | |
181 | int i; | |
182 | ||
183 | new_hashtbl = kzalloc(size, GFP_KERNEL); | |
184 | if (!new_hashtbl) | |
185 | return -1; | |
186 | ||
187 | _lock_tx_hashtbl_bh(bond); | |
188 | ||
189 | bond_info->tx_hashtbl = new_hashtbl; | |
190 | ||
191 | for (i = 0; i < TLB_HASH_TABLE_SIZE; i++) | |
192 | tlb_init_table_entry(&bond_info->tx_hashtbl[i], 0); | |
193 | ||
194 | _unlock_tx_hashtbl_bh(bond); | |
195 | ||
196 | return 0; | |
197 | } | |
198 | ||
199 | /* Must be called only after all slaves have been released */ | |
200 | static void tlb_deinitialize(struct bonding *bond) | |
201 | { | |
202 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
203 | struct tlb_up_slave *arr; | |
204 | ||
205 | _lock_tx_hashtbl_bh(bond); | |
206 | ||
207 | kfree(bond_info->tx_hashtbl); | |
208 | bond_info->tx_hashtbl = NULL; | |
209 | ||
210 | _unlock_tx_hashtbl_bh(bond); | |
211 | ||
212 | arr = rtnl_dereference(bond_info->slave_arr); | |
213 | if (arr) | |
214 | kfree_rcu(arr, rcu); | |
215 | } | |
216 | ||
217 | static long long compute_gap(struct slave *slave) | |
218 | { | |
219 | return (s64) (slave->speed << 20) - /* Convert to Megabit per sec */ | |
220 | (s64) (SLAVE_TLB_INFO(slave).load << 3); /* Bytes to bits */ | |
221 | } | |
222 | ||
223 | /* Caller must hold bond lock for read */ | |
224 | static struct slave *tlb_get_least_loaded_slave(struct bonding *bond) | |
225 | { | |
226 | struct slave *slave, *least_loaded; | |
227 | struct list_head *iter; | |
228 | long long max_gap; | |
229 | ||
230 | least_loaded = NULL; | |
231 | max_gap = LLONG_MIN; | |
232 | ||
233 | /* Find the slave with the largest gap */ | |
234 | bond_for_each_slave_rcu(bond, slave, iter) { | |
235 | if (bond_slave_can_tx(slave)) { | |
236 | long long gap = compute_gap(slave); | |
237 | ||
238 | if (max_gap < gap) { | |
239 | least_loaded = slave; | |
240 | max_gap = gap; | |
241 | } | |
242 | } | |
243 | } | |
244 | ||
245 | return least_loaded; | |
246 | } | |
247 | ||
248 | static struct slave *__tlb_choose_channel(struct bonding *bond, u32 hash_index, | |
249 | u32 skb_len) | |
250 | { | |
251 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
252 | struct tlb_client_info *hash_table; | |
253 | struct slave *assigned_slave; | |
254 | ||
255 | hash_table = bond_info->tx_hashtbl; | |
256 | assigned_slave = hash_table[hash_index].tx_slave; | |
257 | if (!assigned_slave) { | |
258 | assigned_slave = tlb_get_least_loaded_slave(bond); | |
259 | ||
260 | if (assigned_slave) { | |
261 | struct tlb_slave_info *slave_info = | |
262 | &(SLAVE_TLB_INFO(assigned_slave)); | |
263 | u32 next_index = slave_info->head; | |
264 | ||
265 | hash_table[hash_index].tx_slave = assigned_slave; | |
266 | hash_table[hash_index].next = next_index; | |
267 | hash_table[hash_index].prev = TLB_NULL_INDEX; | |
268 | ||
269 | if (next_index != TLB_NULL_INDEX) | |
270 | hash_table[next_index].prev = hash_index; | |
271 | ||
272 | slave_info->head = hash_index; | |
273 | slave_info->load += | |
274 | hash_table[hash_index].load_history; | |
275 | } | |
276 | } | |
277 | ||
278 | if (assigned_slave) | |
279 | hash_table[hash_index].tx_bytes += skb_len; | |
280 | ||
281 | return assigned_slave; | |
282 | } | |
283 | ||
284 | /* Caller must hold bond lock for read */ | |
285 | static struct slave *tlb_choose_channel(struct bonding *bond, u32 hash_index, | |
286 | u32 skb_len) | |
287 | { | |
288 | struct slave *tx_slave; | |
289 | /* | |
290 | * We don't need to disable softirq here, becase | |
291 | * tlb_choose_channel() is only called by bond_alb_xmit() | |
292 | * which already has softirq disabled. | |
293 | */ | |
294 | _lock_tx_hashtbl(bond); | |
295 | tx_slave = __tlb_choose_channel(bond, hash_index, skb_len); | |
296 | _unlock_tx_hashtbl(bond); | |
297 | return tx_slave; | |
298 | } | |
299 | ||
300 | /*********************** rlb specific functions ***************************/ | |
301 | static inline void _lock_rx_hashtbl_bh(struct bonding *bond) | |
302 | { | |
303 | spin_lock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock)); | |
304 | } | |
305 | ||
306 | static inline void _unlock_rx_hashtbl_bh(struct bonding *bond) | |
307 | { | |
308 | spin_unlock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock)); | |
309 | } | |
310 | ||
311 | static inline void _lock_rx_hashtbl(struct bonding *bond) | |
312 | { | |
313 | spin_lock(&(BOND_ALB_INFO(bond).rx_hashtbl_lock)); | |
314 | } | |
315 | ||
316 | static inline void _unlock_rx_hashtbl(struct bonding *bond) | |
317 | { | |
318 | spin_unlock(&(BOND_ALB_INFO(bond).rx_hashtbl_lock)); | |
319 | } | |
320 | ||
321 | /* when an ARP REPLY is received from a client update its info | |
322 | * in the rx_hashtbl | |
323 | */ | |
324 | static void rlb_update_entry_from_arp(struct bonding *bond, struct arp_pkt *arp) | |
325 | { | |
326 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
327 | struct rlb_client_info *client_info; | |
328 | u32 hash_index; | |
329 | ||
330 | _lock_rx_hashtbl_bh(bond); | |
331 | ||
332 | hash_index = _simple_hash((u8 *)&(arp->ip_src), sizeof(arp->ip_src)); | |
333 | client_info = &(bond_info->rx_hashtbl[hash_index]); | |
334 | ||
335 | if ((client_info->assigned) && | |
336 | (client_info->ip_src == arp->ip_dst) && | |
337 | (client_info->ip_dst == arp->ip_src) && | |
338 | (!ether_addr_equal_64bits(client_info->mac_dst, arp->mac_src))) { | |
339 | /* update the clients MAC address */ | |
340 | ether_addr_copy(client_info->mac_dst, arp->mac_src); | |
341 | client_info->ntt = 1; | |
342 | bond_info->rx_ntt = 1; | |
343 | } | |
344 | ||
345 | _unlock_rx_hashtbl_bh(bond); | |
346 | } | |
347 | ||
348 | static int rlb_arp_recv(const struct sk_buff *skb, struct bonding *bond, | |
349 | struct slave *slave) | |
350 | { | |
351 | struct arp_pkt *arp, _arp; | |
352 | ||
353 | if (skb->protocol != cpu_to_be16(ETH_P_ARP)) | |
354 | goto out; | |
355 | ||
356 | arp = skb_header_pointer(skb, 0, sizeof(_arp), &_arp); | |
357 | if (!arp) | |
358 | goto out; | |
359 | ||
360 | /* We received an ARP from arp->ip_src. | |
361 | * We might have used this IP address previously (on the bonding host | |
362 | * itself or on a system that is bridged together with the bond). | |
363 | * However, if arp->mac_src is different than what is stored in | |
364 | * rx_hashtbl, some other host is now using the IP and we must prevent | |
365 | * sending out client updates with this IP address and the old MAC | |
366 | * address. | |
367 | * Clean up all hash table entries that have this address as ip_src but | |
368 | * have a different mac_src. | |
369 | */ | |
370 | rlb_purge_src_ip(bond, arp); | |
371 | ||
372 | if (arp->op_code == htons(ARPOP_REPLY)) { | |
373 | /* update rx hash table for this ARP */ | |
374 | rlb_update_entry_from_arp(bond, arp); | |
375 | netdev_dbg(bond->dev, "Server received an ARP Reply from client\n"); | |
376 | } | |
377 | out: | |
378 | return RX_HANDLER_ANOTHER; | |
379 | } | |
380 | ||
381 | /* Caller must hold bond lock for read */ | |
382 | static struct slave *rlb_next_rx_slave(struct bonding *bond) | |
383 | { | |
384 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
385 | struct slave *before = NULL, *rx_slave = NULL, *slave; | |
386 | struct list_head *iter; | |
387 | bool found = false; | |
388 | ||
389 | bond_for_each_slave(bond, slave, iter) { | |
390 | if (!bond_slave_can_tx(slave)) | |
391 | continue; | |
392 | if (!found) { | |
393 | if (!before || before->speed < slave->speed) | |
394 | before = slave; | |
395 | } else { | |
396 | if (!rx_slave || rx_slave->speed < slave->speed) | |
397 | rx_slave = slave; | |
398 | } | |
399 | if (slave == bond_info->rx_slave) | |
400 | found = true; | |
401 | } | |
402 | /* we didn't find anything after the current or we have something | |
403 | * better before and up to the current slave | |
404 | */ | |
405 | if (!rx_slave || (before && rx_slave->speed < before->speed)) | |
406 | rx_slave = before; | |
407 | ||
408 | if (rx_slave) | |
409 | bond_info->rx_slave = rx_slave; | |
410 | ||
411 | return rx_slave; | |
412 | } | |
413 | ||
414 | /* Caller must hold rcu_read_lock() for read */ | |
415 | static struct slave *__rlb_next_rx_slave(struct bonding *bond) | |
416 | { | |
417 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
418 | struct slave *before = NULL, *rx_slave = NULL, *slave; | |
419 | struct list_head *iter; | |
420 | bool found = false; | |
421 | ||
422 | bond_for_each_slave_rcu(bond, slave, iter) { | |
423 | if (!bond_slave_can_tx(slave)) | |
424 | continue; | |
425 | if (!found) { | |
426 | if (!before || before->speed < slave->speed) | |
427 | before = slave; | |
428 | } else { | |
429 | if (!rx_slave || rx_slave->speed < slave->speed) | |
430 | rx_slave = slave; | |
431 | } | |
432 | if (slave == bond_info->rx_slave) | |
433 | found = true; | |
434 | } | |
435 | /* we didn't find anything after the current or we have something | |
436 | * better before and up to the current slave | |
437 | */ | |
438 | if (!rx_slave || (before && rx_slave->speed < before->speed)) | |
439 | rx_slave = before; | |
440 | ||
441 | if (rx_slave) | |
442 | bond_info->rx_slave = rx_slave; | |
443 | ||
444 | return rx_slave; | |
445 | } | |
446 | ||
447 | /* teach the switch the mac of a disabled slave | |
448 | * on the primary for fault tolerance | |
449 | * | |
450 | * Caller must hold bond->curr_slave_lock for write or bond lock for write | |
451 | */ | |
452 | static void rlb_teach_disabled_mac_on_primary(struct bonding *bond, u8 addr[]) | |
453 | { | |
454 | struct slave *curr_active = bond_deref_active_protected(bond); | |
455 | ||
456 | if (!curr_active) | |
457 | return; | |
458 | ||
459 | if (!bond->alb_info.primary_is_promisc) { | |
460 | if (!dev_set_promiscuity(curr_active->dev, 1)) | |
461 | bond->alb_info.primary_is_promisc = 1; | |
462 | else | |
463 | bond->alb_info.primary_is_promisc = 0; | |
464 | } | |
465 | ||
466 | bond->alb_info.rlb_promisc_timeout_counter = 0; | |
467 | ||
468 | alb_send_learning_packets(curr_active, addr, true); | |
469 | } | |
470 | ||
471 | /* slave being removed should not be active at this point | |
472 | * | |
473 | * Caller must hold rtnl. | |
474 | */ | |
475 | static void rlb_clear_slave(struct bonding *bond, struct slave *slave) | |
476 | { | |
477 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
478 | struct rlb_client_info *rx_hash_table; | |
479 | u32 index, next_index; | |
480 | ||
481 | /* clear slave from rx_hashtbl */ | |
482 | _lock_rx_hashtbl_bh(bond); | |
483 | ||
484 | rx_hash_table = bond_info->rx_hashtbl; | |
485 | index = bond_info->rx_hashtbl_used_head; | |
486 | for (; index != RLB_NULL_INDEX; index = next_index) { | |
487 | next_index = rx_hash_table[index].used_next; | |
488 | if (rx_hash_table[index].slave == slave) { | |
489 | struct slave *assigned_slave = rlb_next_rx_slave(bond); | |
490 | ||
491 | if (assigned_slave) { | |
492 | rx_hash_table[index].slave = assigned_slave; | |
493 | if (!ether_addr_equal_64bits(rx_hash_table[index].mac_dst, | |
494 | mac_bcast)) { | |
495 | bond_info->rx_hashtbl[index].ntt = 1; | |
496 | bond_info->rx_ntt = 1; | |
497 | /* A slave has been removed from the | |
498 | * table because it is either disabled | |
499 | * or being released. We must retry the | |
500 | * update to avoid clients from not | |
501 | * being updated & disconnecting when | |
502 | * there is stress | |
503 | */ | |
504 | bond_info->rlb_update_retry_counter = | |
505 | RLB_UPDATE_RETRY; | |
506 | } | |
507 | } else { /* there is no active slave */ | |
508 | rx_hash_table[index].slave = NULL; | |
509 | } | |
510 | } | |
511 | } | |
512 | ||
513 | _unlock_rx_hashtbl_bh(bond); | |
514 | ||
515 | write_lock_bh(&bond->curr_slave_lock); | |
516 | ||
517 | if (slave != bond_deref_active_protected(bond)) | |
518 | rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr); | |
519 | ||
520 | write_unlock_bh(&bond->curr_slave_lock); | |
521 | } | |
522 | ||
523 | static void rlb_update_client(struct rlb_client_info *client_info) | |
524 | { | |
525 | int i; | |
526 | ||
527 | if (!client_info->slave) | |
528 | return; | |
529 | ||
530 | for (i = 0; i < RLB_ARP_BURST_SIZE; i++) { | |
531 | struct sk_buff *skb; | |
532 | ||
533 | skb = arp_create(ARPOP_REPLY, ETH_P_ARP, | |
534 | client_info->ip_dst, | |
535 | client_info->slave->dev, | |
536 | client_info->ip_src, | |
537 | client_info->mac_dst, | |
538 | client_info->slave->dev->dev_addr, | |
539 | client_info->mac_dst); | |
540 | if (!skb) { | |
541 | netdev_err(client_info->slave->bond->dev, | |
542 | "failed to create an ARP packet\n"); | |
543 | continue; | |
544 | } | |
545 | ||
546 | skb->dev = client_info->slave->dev; | |
547 | ||
548 | if (client_info->vlan_id) { | |
549 | skb = vlan_put_tag(skb, htons(ETH_P_8021Q), client_info->vlan_id); | |
550 | if (!skb) { | |
551 | netdev_err(client_info->slave->bond->dev, | |
552 | "failed to insert VLAN tag\n"); | |
553 | continue; | |
554 | } | |
555 | } | |
556 | ||
557 | arp_xmit(skb); | |
558 | } | |
559 | } | |
560 | ||
561 | /* sends ARP REPLIES that update the clients that need updating */ | |
562 | static void rlb_update_rx_clients(struct bonding *bond) | |
563 | { | |
564 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
565 | struct rlb_client_info *client_info; | |
566 | u32 hash_index; | |
567 | ||
568 | _lock_rx_hashtbl_bh(bond); | |
569 | ||
570 | hash_index = bond_info->rx_hashtbl_used_head; | |
571 | for (; hash_index != RLB_NULL_INDEX; | |
572 | hash_index = client_info->used_next) { | |
573 | client_info = &(bond_info->rx_hashtbl[hash_index]); | |
574 | if (client_info->ntt) { | |
575 | rlb_update_client(client_info); | |
576 | if (bond_info->rlb_update_retry_counter == 0) | |
577 | client_info->ntt = 0; | |
578 | } | |
579 | } | |
580 | ||
581 | /* do not update the entries again until this counter is zero so that | |
582 | * not to confuse the clients. | |
583 | */ | |
584 | bond_info->rlb_update_delay_counter = RLB_UPDATE_DELAY; | |
585 | ||
586 | _unlock_rx_hashtbl_bh(bond); | |
587 | } | |
588 | ||
589 | /* The slave was assigned a new mac address - update the clients */ | |
590 | static void rlb_req_update_slave_clients(struct bonding *bond, struct slave *slave) | |
591 | { | |
592 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
593 | struct rlb_client_info *client_info; | |
594 | int ntt = 0; | |
595 | u32 hash_index; | |
596 | ||
597 | _lock_rx_hashtbl_bh(bond); | |
598 | ||
599 | hash_index = bond_info->rx_hashtbl_used_head; | |
600 | for (; hash_index != RLB_NULL_INDEX; | |
601 | hash_index = client_info->used_next) { | |
602 | client_info = &(bond_info->rx_hashtbl[hash_index]); | |
603 | ||
604 | if ((client_info->slave == slave) && | |
605 | !ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) { | |
606 | client_info->ntt = 1; | |
607 | ntt = 1; | |
608 | } | |
609 | } | |
610 | ||
611 | /* update the team's flag only after the whole iteration */ | |
612 | if (ntt) { | |
613 | bond_info->rx_ntt = 1; | |
614 | /* fasten the change */ | |
615 | bond_info->rlb_update_retry_counter = RLB_UPDATE_RETRY; | |
616 | } | |
617 | ||
618 | _unlock_rx_hashtbl_bh(bond); | |
619 | } | |
620 | ||
621 | /* mark all clients using src_ip to be updated */ | |
622 | static void rlb_req_update_subnet_clients(struct bonding *bond, __be32 src_ip) | |
623 | { | |
624 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
625 | struct rlb_client_info *client_info; | |
626 | u32 hash_index; | |
627 | ||
628 | _lock_rx_hashtbl(bond); | |
629 | ||
630 | hash_index = bond_info->rx_hashtbl_used_head; | |
631 | for (; hash_index != RLB_NULL_INDEX; | |
632 | hash_index = client_info->used_next) { | |
633 | client_info = &(bond_info->rx_hashtbl[hash_index]); | |
634 | ||
635 | if (!client_info->slave) { | |
636 | netdev_err(bond->dev, "found a client with no channel in the client's hash table\n"); | |
637 | continue; | |
638 | } | |
639 | /*update all clients using this src_ip, that are not assigned | |
640 | * to the team's address (curr_active_slave) and have a known | |
641 | * unicast mac address. | |
642 | */ | |
643 | if ((client_info->ip_src == src_ip) && | |
644 | !ether_addr_equal_64bits(client_info->slave->dev->dev_addr, | |
645 | bond->dev->dev_addr) && | |
646 | !ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) { | |
647 | client_info->ntt = 1; | |
648 | bond_info->rx_ntt = 1; | |
649 | } | |
650 | } | |
651 | ||
652 | _unlock_rx_hashtbl(bond); | |
653 | } | |
654 | ||
655 | /* Caller must hold both bond and ptr locks for read */ | |
656 | static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bond) | |
657 | { | |
658 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
659 | struct arp_pkt *arp = arp_pkt(skb); | |
660 | struct slave *assigned_slave, *curr_active_slave; | |
661 | struct rlb_client_info *client_info; | |
662 | u32 hash_index = 0; | |
663 | ||
664 | _lock_rx_hashtbl(bond); | |
665 | ||
666 | curr_active_slave = rcu_dereference(bond->curr_active_slave); | |
667 | ||
668 | hash_index = _simple_hash((u8 *)&arp->ip_dst, sizeof(arp->ip_dst)); | |
669 | client_info = &(bond_info->rx_hashtbl[hash_index]); | |
670 | ||
671 | if (client_info->assigned) { | |
672 | if ((client_info->ip_src == arp->ip_src) && | |
673 | (client_info->ip_dst == arp->ip_dst)) { | |
674 | /* the entry is already assigned to this client */ | |
675 | if (!ether_addr_equal_64bits(arp->mac_dst, mac_bcast)) { | |
676 | /* update mac address from arp */ | |
677 | ether_addr_copy(client_info->mac_dst, arp->mac_dst); | |
678 | } | |
679 | ether_addr_copy(client_info->mac_src, arp->mac_src); | |
680 | ||
681 | assigned_slave = client_info->slave; | |
682 | if (assigned_slave) { | |
683 | _unlock_rx_hashtbl(bond); | |
684 | return assigned_slave; | |
685 | } | |
686 | } else { | |
687 | /* the entry is already assigned to some other client, | |
688 | * move the old client to primary (curr_active_slave) so | |
689 | * that the new client can be assigned to this entry. | |
690 | */ | |
691 | if (curr_active_slave && | |
692 | client_info->slave != curr_active_slave) { | |
693 | client_info->slave = curr_active_slave; | |
694 | rlb_update_client(client_info); | |
695 | } | |
696 | } | |
697 | } | |
698 | /* assign a new slave */ | |
699 | assigned_slave = __rlb_next_rx_slave(bond); | |
700 | ||
701 | if (assigned_slave) { | |
702 | if (!(client_info->assigned && | |
703 | client_info->ip_src == arp->ip_src)) { | |
704 | /* ip_src is going to be updated, | |
705 | * fix the src hash list | |
706 | */ | |
707 | u32 hash_src = _simple_hash((u8 *)&arp->ip_src, | |
708 | sizeof(arp->ip_src)); | |
709 | rlb_src_unlink(bond, hash_index); | |
710 | rlb_src_link(bond, hash_src, hash_index); | |
711 | } | |
712 | ||
713 | client_info->ip_src = arp->ip_src; | |
714 | client_info->ip_dst = arp->ip_dst; | |
715 | /* arp->mac_dst is broadcast for arp reqeusts. | |
716 | * will be updated with clients actual unicast mac address | |
717 | * upon receiving an arp reply. | |
718 | */ | |
719 | ether_addr_copy(client_info->mac_dst, arp->mac_dst); | |
720 | ether_addr_copy(client_info->mac_src, arp->mac_src); | |
721 | client_info->slave = assigned_slave; | |
722 | ||
723 | if (!ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) { | |
724 | client_info->ntt = 1; | |
725 | bond->alb_info.rx_ntt = 1; | |
726 | } else { | |
727 | client_info->ntt = 0; | |
728 | } | |
729 | ||
730 | if (vlan_get_tag(skb, &client_info->vlan_id)) | |
731 | client_info->vlan_id = 0; | |
732 | ||
733 | if (!client_info->assigned) { | |
734 | u32 prev_tbl_head = bond_info->rx_hashtbl_used_head; | |
735 | bond_info->rx_hashtbl_used_head = hash_index; | |
736 | client_info->used_next = prev_tbl_head; | |
737 | if (prev_tbl_head != RLB_NULL_INDEX) { | |
738 | bond_info->rx_hashtbl[prev_tbl_head].used_prev = | |
739 | hash_index; | |
740 | } | |
741 | client_info->assigned = 1; | |
742 | } | |
743 | } | |
744 | ||
745 | _unlock_rx_hashtbl(bond); | |
746 | ||
747 | return assigned_slave; | |
748 | } | |
749 | ||
750 | /* chooses (and returns) transmit channel for arp reply | |
751 | * does not choose channel for other arp types since they are | |
752 | * sent on the curr_active_slave | |
753 | */ | |
754 | static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond) | |
755 | { | |
756 | struct arp_pkt *arp = arp_pkt(skb); | |
757 | struct slave *tx_slave = NULL; | |
758 | ||
759 | /* Don't modify or load balance ARPs that do not originate locally | |
760 | * (e.g.,arrive via a bridge). | |
761 | */ | |
762 | if (!bond_slave_has_mac_rx(bond, arp->mac_src)) | |
763 | return NULL; | |
764 | ||
765 | if (arp->op_code == htons(ARPOP_REPLY)) { | |
766 | /* the arp must be sent on the selected | |
767 | * rx channel | |
768 | */ | |
769 | tx_slave = rlb_choose_channel(skb, bond); | |
770 | if (tx_slave) | |
771 | ether_addr_copy(arp->mac_src, tx_slave->dev->dev_addr); | |
772 | netdev_dbg(bond->dev, "Server sent ARP Reply packet\n"); | |
773 | } else if (arp->op_code == htons(ARPOP_REQUEST)) { | |
774 | /* Create an entry in the rx_hashtbl for this client as a | |
775 | * place holder. | |
776 | * When the arp reply is received the entry will be updated | |
777 | * with the correct unicast address of the client. | |
778 | */ | |
779 | rlb_choose_channel(skb, bond); | |
780 | ||
781 | /* The ARP reply packets must be delayed so that | |
782 | * they can cancel out the influence of the ARP request. | |
783 | */ | |
784 | bond->alb_info.rlb_update_delay_counter = RLB_UPDATE_DELAY; | |
785 | ||
786 | /* arp requests are broadcast and are sent on the primary | |
787 | * the arp request will collapse all clients on the subnet to | |
788 | * the primary slave. We must register these clients to be | |
789 | * updated with their assigned mac. | |
790 | */ | |
791 | rlb_req_update_subnet_clients(bond, arp->ip_src); | |
792 | netdev_dbg(bond->dev, "Server sent ARP Request packet\n"); | |
793 | } | |
794 | ||
795 | return tx_slave; | |
796 | } | |
797 | ||
798 | /* Caller must hold bond lock for read */ | |
799 | static void rlb_rebalance(struct bonding *bond) | |
800 | { | |
801 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
802 | struct slave *assigned_slave; | |
803 | struct rlb_client_info *client_info; | |
804 | int ntt; | |
805 | u32 hash_index; | |
806 | ||
807 | _lock_rx_hashtbl_bh(bond); | |
808 | ||
809 | ntt = 0; | |
810 | hash_index = bond_info->rx_hashtbl_used_head; | |
811 | for (; hash_index != RLB_NULL_INDEX; | |
812 | hash_index = client_info->used_next) { | |
813 | client_info = &(bond_info->rx_hashtbl[hash_index]); | |
814 | assigned_slave = __rlb_next_rx_slave(bond); | |
815 | if (assigned_slave && (client_info->slave != assigned_slave)) { | |
816 | client_info->slave = assigned_slave; | |
817 | client_info->ntt = 1; | |
818 | ntt = 1; | |
819 | } | |
820 | } | |
821 | ||
822 | /* update the team's flag only after the whole iteration */ | |
823 | if (ntt) | |
824 | bond_info->rx_ntt = 1; | |
825 | _unlock_rx_hashtbl_bh(bond); | |
826 | } | |
827 | ||
828 | /* Caller must hold rx_hashtbl lock */ | |
829 | static void rlb_init_table_entry_dst(struct rlb_client_info *entry) | |
830 | { | |
831 | entry->used_next = RLB_NULL_INDEX; | |
832 | entry->used_prev = RLB_NULL_INDEX; | |
833 | entry->assigned = 0; | |
834 | entry->slave = NULL; | |
835 | entry->vlan_id = 0; | |
836 | } | |
837 | static void rlb_init_table_entry_src(struct rlb_client_info *entry) | |
838 | { | |
839 | entry->src_first = RLB_NULL_INDEX; | |
840 | entry->src_prev = RLB_NULL_INDEX; | |
841 | entry->src_next = RLB_NULL_INDEX; | |
842 | } | |
843 | ||
844 | static void rlb_init_table_entry(struct rlb_client_info *entry) | |
845 | { | |
846 | memset(entry, 0, sizeof(struct rlb_client_info)); | |
847 | rlb_init_table_entry_dst(entry); | |
848 | rlb_init_table_entry_src(entry); | |
849 | } | |
850 | ||
851 | static void rlb_delete_table_entry_dst(struct bonding *bond, u32 index) | |
852 | { | |
853 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
854 | u32 next_index = bond_info->rx_hashtbl[index].used_next; | |
855 | u32 prev_index = bond_info->rx_hashtbl[index].used_prev; | |
856 | ||
857 | if (index == bond_info->rx_hashtbl_used_head) | |
858 | bond_info->rx_hashtbl_used_head = next_index; | |
859 | if (prev_index != RLB_NULL_INDEX) | |
860 | bond_info->rx_hashtbl[prev_index].used_next = next_index; | |
861 | if (next_index != RLB_NULL_INDEX) | |
862 | bond_info->rx_hashtbl[next_index].used_prev = prev_index; | |
863 | } | |
864 | ||
865 | /* unlink a rlb hash table entry from the src list */ | |
866 | static void rlb_src_unlink(struct bonding *bond, u32 index) | |
867 | { | |
868 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
869 | u32 next_index = bond_info->rx_hashtbl[index].src_next; | |
870 | u32 prev_index = bond_info->rx_hashtbl[index].src_prev; | |
871 | ||
872 | bond_info->rx_hashtbl[index].src_next = RLB_NULL_INDEX; | |
873 | bond_info->rx_hashtbl[index].src_prev = RLB_NULL_INDEX; | |
874 | ||
875 | if (next_index != RLB_NULL_INDEX) | |
876 | bond_info->rx_hashtbl[next_index].src_prev = prev_index; | |
877 | ||
878 | if (prev_index == RLB_NULL_INDEX) | |
879 | return; | |
880 | ||
881 | /* is prev_index pointing to the head of this list? */ | |
882 | if (bond_info->rx_hashtbl[prev_index].src_first == index) | |
883 | bond_info->rx_hashtbl[prev_index].src_first = next_index; | |
884 | else | |
885 | bond_info->rx_hashtbl[prev_index].src_next = next_index; | |
886 | ||
887 | } | |
888 | ||
889 | static void rlb_delete_table_entry(struct bonding *bond, u32 index) | |
890 | { | |
891 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
892 | struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]); | |
893 | ||
894 | rlb_delete_table_entry_dst(bond, index); | |
895 | rlb_init_table_entry_dst(entry); | |
896 | ||
897 | rlb_src_unlink(bond, index); | |
898 | } | |
899 | ||
900 | /* add the rx_hashtbl[ip_dst_hash] entry to the list | |
901 | * of entries with identical ip_src_hash | |
902 | */ | |
903 | static void rlb_src_link(struct bonding *bond, u32 ip_src_hash, u32 ip_dst_hash) | |
904 | { | |
905 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
906 | u32 next; | |
907 | ||
908 | bond_info->rx_hashtbl[ip_dst_hash].src_prev = ip_src_hash; | |
909 | next = bond_info->rx_hashtbl[ip_src_hash].src_first; | |
910 | bond_info->rx_hashtbl[ip_dst_hash].src_next = next; | |
911 | if (next != RLB_NULL_INDEX) | |
912 | bond_info->rx_hashtbl[next].src_prev = ip_dst_hash; | |
913 | bond_info->rx_hashtbl[ip_src_hash].src_first = ip_dst_hash; | |
914 | } | |
915 | ||
916 | /* deletes all rx_hashtbl entries with arp->ip_src if their mac_src does | |
917 | * not match arp->mac_src */ | |
918 | static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp) | |
919 | { | |
920 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
921 | u32 ip_src_hash = _simple_hash((u8 *)&(arp->ip_src), sizeof(arp->ip_src)); | |
922 | u32 index; | |
923 | ||
924 | _lock_rx_hashtbl_bh(bond); | |
925 | ||
926 | index = bond_info->rx_hashtbl[ip_src_hash].src_first; | |
927 | while (index != RLB_NULL_INDEX) { | |
928 | struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]); | |
929 | u32 next_index = entry->src_next; | |
930 | if (entry->ip_src == arp->ip_src && | |
931 | !ether_addr_equal_64bits(arp->mac_src, entry->mac_src)) | |
932 | rlb_delete_table_entry(bond, index); | |
933 | index = next_index; | |
934 | } | |
935 | _unlock_rx_hashtbl_bh(bond); | |
936 | } | |
937 | ||
938 | static int rlb_initialize(struct bonding *bond) | |
939 | { | |
940 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
941 | struct rlb_client_info *new_hashtbl; | |
942 | int size = RLB_HASH_TABLE_SIZE * sizeof(struct rlb_client_info); | |
943 | int i; | |
944 | ||
945 | new_hashtbl = kmalloc(size, GFP_KERNEL); | |
946 | if (!new_hashtbl) | |
947 | return -1; | |
948 | ||
949 | _lock_rx_hashtbl_bh(bond); | |
950 | ||
951 | bond_info->rx_hashtbl = new_hashtbl; | |
952 | ||
953 | bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX; | |
954 | ||
955 | for (i = 0; i < RLB_HASH_TABLE_SIZE; i++) | |
956 | rlb_init_table_entry(bond_info->rx_hashtbl + i); | |
957 | ||
958 | _unlock_rx_hashtbl_bh(bond); | |
959 | ||
960 | /* register to receive ARPs */ | |
961 | bond->recv_probe = rlb_arp_recv; | |
962 | ||
963 | return 0; | |
964 | } | |
965 | ||
966 | static void rlb_deinitialize(struct bonding *bond) | |
967 | { | |
968 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
969 | ||
970 | _lock_rx_hashtbl_bh(bond); | |
971 | ||
972 | kfree(bond_info->rx_hashtbl); | |
973 | bond_info->rx_hashtbl = NULL; | |
974 | bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX; | |
975 | ||
976 | _unlock_rx_hashtbl_bh(bond); | |
977 | } | |
978 | ||
979 | static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id) | |
980 | { | |
981 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
982 | u32 curr_index; | |
983 | ||
984 | _lock_rx_hashtbl_bh(bond); | |
985 | ||
986 | curr_index = bond_info->rx_hashtbl_used_head; | |
987 | while (curr_index != RLB_NULL_INDEX) { | |
988 | struct rlb_client_info *curr = &(bond_info->rx_hashtbl[curr_index]); | |
989 | u32 next_index = bond_info->rx_hashtbl[curr_index].used_next; | |
990 | ||
991 | if (curr->vlan_id == vlan_id) | |
992 | rlb_delete_table_entry(bond, curr_index); | |
993 | ||
994 | curr_index = next_index; | |
995 | } | |
996 | ||
997 | _unlock_rx_hashtbl_bh(bond); | |
998 | } | |
999 | ||
1000 | /*********************** tlb/rlb shared functions *********************/ | |
1001 | ||
1002 | static void alb_send_lp_vid(struct slave *slave, u8 mac_addr[], | |
1003 | __be16 vlan_proto, u16 vid) | |
1004 | { | |
1005 | struct learning_pkt pkt; | |
1006 | struct sk_buff *skb; | |
1007 | int size = sizeof(struct learning_pkt); | |
1008 | char *data; | |
1009 | ||
1010 | memset(&pkt, 0, size); | |
1011 | ether_addr_copy(pkt.mac_dst, mac_addr); | |
1012 | ether_addr_copy(pkt.mac_src, mac_addr); | |
1013 | pkt.type = cpu_to_be16(ETH_P_LOOPBACK); | |
1014 | ||
1015 | skb = dev_alloc_skb(size); | |
1016 | if (!skb) | |
1017 | return; | |
1018 | ||
1019 | data = skb_put(skb, size); | |
1020 | memcpy(data, &pkt, size); | |
1021 | ||
1022 | skb_reset_mac_header(skb); | |
1023 | skb->network_header = skb->mac_header + ETH_HLEN; | |
1024 | skb->protocol = pkt.type; | |
1025 | skb->priority = TC_PRIO_CONTROL; | |
1026 | skb->dev = slave->dev; | |
1027 | ||
1028 | if (vid) { | |
1029 | skb = vlan_put_tag(skb, vlan_proto, vid); | |
1030 | if (!skb) { | |
1031 | netdev_err(slave->bond->dev, "failed to insert VLAN tag\n"); | |
1032 | return; | |
1033 | } | |
1034 | } | |
1035 | ||
1036 | dev_queue_xmit(skb); | |
1037 | } | |
1038 | ||
1039 | static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[], | |
1040 | bool strict_match) | |
1041 | { | |
1042 | struct bonding *bond = bond_get_bond_by_slave(slave); | |
1043 | struct net_device *upper; | |
1044 | struct list_head *iter; | |
1045 | struct bond_vlan_tag *tags; | |
1046 | ||
1047 | /* send untagged */ | |
1048 | alb_send_lp_vid(slave, mac_addr, 0, 0); | |
1049 | ||
1050 | /* loop through all devices and see if we need to send a packet | |
1051 | * for that device. | |
1052 | */ | |
1053 | rcu_read_lock(); | |
1054 | netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) { | |
1055 | if (is_vlan_dev(upper) && vlan_get_encap_level(upper) == 0) { | |
1056 | if (strict_match && | |
1057 | ether_addr_equal_64bits(mac_addr, | |
1058 | upper->dev_addr)) { | |
1059 | alb_send_lp_vid(slave, mac_addr, | |
1060 | vlan_dev_vlan_proto(upper), | |
1061 | vlan_dev_vlan_id(upper)); | |
1062 | } else if (!strict_match) { | |
1063 | alb_send_lp_vid(slave, upper->dev_addr, | |
1064 | vlan_dev_vlan_proto(upper), | |
1065 | vlan_dev_vlan_id(upper)); | |
1066 | } | |
1067 | } | |
1068 | ||
1069 | /* If this is a macvlan device, then only send updates | |
1070 | * when strict_match is turned off. | |
1071 | */ | |
1072 | if (netif_is_macvlan(upper) && !strict_match) { | |
1073 | tags = bond_verify_device_path(bond->dev, upper, 0); | |
1074 | if (IS_ERR_OR_NULL(tags)) | |
1075 | BUG(); | |
1076 | alb_send_lp_vid(slave, upper->dev_addr, | |
1077 | tags[0].vlan_proto, tags[0].vlan_id); | |
1078 | kfree(tags); | |
1079 | } | |
1080 | } | |
1081 | rcu_read_unlock(); | |
1082 | } | |
1083 | ||
1084 | static int alb_set_slave_mac_addr(struct slave *slave, u8 addr[]) | |
1085 | { | |
1086 | struct net_device *dev = slave->dev; | |
1087 | struct sockaddr s_addr; | |
1088 | ||
1089 | if (BOND_MODE(slave->bond) == BOND_MODE_TLB) { | |
1090 | memcpy(dev->dev_addr, addr, dev->addr_len); | |
1091 | return 0; | |
1092 | } | |
1093 | ||
1094 | /* for rlb each slave must have a unique hw mac addresses so that */ | |
1095 | /* each slave will receive packets destined to a different mac */ | |
1096 | memcpy(s_addr.sa_data, addr, dev->addr_len); | |
1097 | s_addr.sa_family = dev->type; | |
1098 | if (dev_set_mac_address(dev, &s_addr)) { | |
1099 | 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", | |
1100 | dev->name); | |
1101 | return -EOPNOTSUPP; | |
1102 | } | |
1103 | return 0; | |
1104 | } | |
1105 | ||
1106 | /* | |
1107 | * Swap MAC addresses between two slaves. | |
1108 | * | |
1109 | * Called with RTNL held, and no other locks. | |
1110 | * | |
1111 | */ | |
1112 | ||
1113 | static void alb_swap_mac_addr(struct slave *slave1, struct slave *slave2) | |
1114 | { | |
1115 | u8 tmp_mac_addr[ETH_ALEN]; | |
1116 | ||
1117 | ether_addr_copy(tmp_mac_addr, slave1->dev->dev_addr); | |
1118 | alb_set_slave_mac_addr(slave1, slave2->dev->dev_addr); | |
1119 | alb_set_slave_mac_addr(slave2, tmp_mac_addr); | |
1120 | ||
1121 | } | |
1122 | ||
1123 | /* | |
1124 | * Send learning packets after MAC address swap. | |
1125 | * | |
1126 | * Called with RTNL and no other locks | |
1127 | */ | |
1128 | static void alb_fasten_mac_swap(struct bonding *bond, struct slave *slave1, | |
1129 | struct slave *slave2) | |
1130 | { | |
1131 | int slaves_state_differ = (bond_slave_can_tx(slave1) != bond_slave_can_tx(slave2)); | |
1132 | struct slave *disabled_slave = NULL; | |
1133 | ||
1134 | ASSERT_RTNL(); | |
1135 | ||
1136 | /* fasten the change in the switch */ | |
1137 | if (bond_slave_can_tx(slave1)) { | |
1138 | alb_send_learning_packets(slave1, slave1->dev->dev_addr, false); | |
1139 | if (bond->alb_info.rlb_enabled) { | |
1140 | /* inform the clients that the mac address | |
1141 | * has changed | |
1142 | */ | |
1143 | rlb_req_update_slave_clients(bond, slave1); | |
1144 | } | |
1145 | } else { | |
1146 | disabled_slave = slave1; | |
1147 | } | |
1148 | ||
1149 | if (bond_slave_can_tx(slave2)) { | |
1150 | alb_send_learning_packets(slave2, slave2->dev->dev_addr, false); | |
1151 | if (bond->alb_info.rlb_enabled) { | |
1152 | /* inform the clients that the mac address | |
1153 | * has changed | |
1154 | */ | |
1155 | rlb_req_update_slave_clients(bond, slave2); | |
1156 | } | |
1157 | } else { | |
1158 | disabled_slave = slave2; | |
1159 | } | |
1160 | ||
1161 | if (bond->alb_info.rlb_enabled && slaves_state_differ) { | |
1162 | /* A disabled slave was assigned an active mac addr */ | |
1163 | rlb_teach_disabled_mac_on_primary(bond, | |
1164 | disabled_slave->dev->dev_addr); | |
1165 | } | |
1166 | } | |
1167 | ||
1168 | /** | |
1169 | * alb_change_hw_addr_on_detach | |
1170 | * @bond: bonding we're working on | |
1171 | * @slave: the slave that was just detached | |
1172 | * | |
1173 | * We assume that @slave was already detached from the slave list. | |
1174 | * | |
1175 | * If @slave's permanent hw address is different both from its current | |
1176 | * address and from @bond's address, then somewhere in the bond there's | |
1177 | * a slave that has @slave's permanet address as its current address. | |
1178 | * We'll make sure that that slave no longer uses @slave's permanent address. | |
1179 | * | |
1180 | * Caller must hold RTNL and no other locks | |
1181 | */ | |
1182 | static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *slave) | |
1183 | { | |
1184 | int perm_curr_diff; | |
1185 | int perm_bond_diff; | |
1186 | struct slave *found_slave; | |
1187 | ||
1188 | perm_curr_diff = !ether_addr_equal_64bits(slave->perm_hwaddr, | |
1189 | slave->dev->dev_addr); | |
1190 | perm_bond_diff = !ether_addr_equal_64bits(slave->perm_hwaddr, | |
1191 | bond->dev->dev_addr); | |
1192 | ||
1193 | if (perm_curr_diff && perm_bond_diff) { | |
1194 | found_slave = bond_slave_has_mac(bond, slave->perm_hwaddr); | |
1195 | ||
1196 | if (found_slave) { | |
1197 | /* locking: needs RTNL and nothing else */ | |
1198 | alb_swap_mac_addr(slave, found_slave); | |
1199 | alb_fasten_mac_swap(bond, slave, found_slave); | |
1200 | } | |
1201 | } | |
1202 | } | |
1203 | ||
1204 | /** | |
1205 | * alb_handle_addr_collision_on_attach | |
1206 | * @bond: bonding we're working on | |
1207 | * @slave: the slave that was just attached | |
1208 | * | |
1209 | * checks uniqueness of slave's mac address and handles the case the | |
1210 | * new slave uses the bonds mac address. | |
1211 | * | |
1212 | * If the permanent hw address of @slave is @bond's hw address, we need to | |
1213 | * find a different hw address to give @slave, that isn't in use by any other | |
1214 | * slave in the bond. This address must be, of course, one of the permanent | |
1215 | * addresses of the other slaves. | |
1216 | * | |
1217 | * We go over the slave list, and for each slave there we compare its | |
1218 | * permanent hw address with the current address of all the other slaves. | |
1219 | * If no match was found, then we've found a slave with a permanent address | |
1220 | * that isn't used by any other slave in the bond, so we can assign it to | |
1221 | * @slave. | |
1222 | * | |
1223 | * assumption: this function is called before @slave is attached to the | |
1224 | * bond slave list. | |
1225 | */ | |
1226 | static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slave *slave) | |
1227 | { | |
1228 | struct slave *has_bond_addr = rcu_access_pointer(bond->curr_active_slave); | |
1229 | struct slave *tmp_slave1, *free_mac_slave = NULL; | |
1230 | struct list_head *iter; | |
1231 | ||
1232 | if (!bond_has_slaves(bond)) { | |
1233 | /* this is the first slave */ | |
1234 | return 0; | |
1235 | } | |
1236 | ||
1237 | /* if slave's mac address differs from bond's mac address | |
1238 | * check uniqueness of slave's mac address against the other | |
1239 | * slaves in the bond. | |
1240 | */ | |
1241 | if (!ether_addr_equal_64bits(slave->perm_hwaddr, bond->dev->dev_addr)) { | |
1242 | if (!bond_slave_has_mac(bond, slave->dev->dev_addr)) | |
1243 | return 0; | |
1244 | ||
1245 | /* Try setting slave mac to bond address and fall-through | |
1246 | to code handling that situation below... */ | |
1247 | alb_set_slave_mac_addr(slave, bond->dev->dev_addr); | |
1248 | } | |
1249 | ||
1250 | /* The slave's address is equal to the address of the bond. | |
1251 | * Search for a spare address in the bond for this slave. | |
1252 | */ | |
1253 | bond_for_each_slave(bond, tmp_slave1, iter) { | |
1254 | if (!bond_slave_has_mac(bond, tmp_slave1->perm_hwaddr)) { | |
1255 | /* no slave has tmp_slave1's perm addr | |
1256 | * as its curr addr | |
1257 | */ | |
1258 | free_mac_slave = tmp_slave1; | |
1259 | break; | |
1260 | } | |
1261 | ||
1262 | if (!has_bond_addr) { | |
1263 | if (ether_addr_equal_64bits(tmp_slave1->dev->dev_addr, | |
1264 | bond->dev->dev_addr)) { | |
1265 | ||
1266 | has_bond_addr = tmp_slave1; | |
1267 | } | |
1268 | } | |
1269 | } | |
1270 | ||
1271 | if (free_mac_slave) { | |
1272 | alb_set_slave_mac_addr(slave, free_mac_slave->perm_hwaddr); | |
1273 | ||
1274 | netdev_warn(bond->dev, "the hw address of slave %s is in use by the bond; giving it the hw address of %s\n", | |
1275 | slave->dev->name, free_mac_slave->dev->name); | |
1276 | ||
1277 | } else if (has_bond_addr) { | |
1278 | 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", | |
1279 | slave->dev->name); | |
1280 | return -EFAULT; | |
1281 | } | |
1282 | ||
1283 | return 0; | |
1284 | } | |
1285 | ||
1286 | /** | |
1287 | * alb_set_mac_address | |
1288 | * @bond: | |
1289 | * @addr: | |
1290 | * | |
1291 | * In TLB mode all slaves are configured to the bond's hw address, but set | |
1292 | * their dev_addr field to different addresses (based on their permanent hw | |
1293 | * addresses). | |
1294 | * | |
1295 | * For each slave, this function sets the interface to the new address and then | |
1296 | * changes its dev_addr field to its previous value. | |
1297 | * | |
1298 | * Unwinding assumes bond's mac address has not yet changed. | |
1299 | */ | |
1300 | static int alb_set_mac_address(struct bonding *bond, void *addr) | |
1301 | { | |
1302 | struct slave *slave, *rollback_slave; | |
1303 | struct list_head *iter; | |
1304 | struct sockaddr sa; | |
1305 | char tmp_addr[ETH_ALEN]; | |
1306 | int res; | |
1307 | ||
1308 | if (bond->alb_info.rlb_enabled) | |
1309 | return 0; | |
1310 | ||
1311 | bond_for_each_slave(bond, slave, iter) { | |
1312 | /* save net_device's current hw address */ | |
1313 | ether_addr_copy(tmp_addr, slave->dev->dev_addr); | |
1314 | ||
1315 | res = dev_set_mac_address(slave->dev, addr); | |
1316 | ||
1317 | /* restore net_device's hw address */ | |
1318 | ether_addr_copy(slave->dev->dev_addr, tmp_addr); | |
1319 | ||
1320 | if (res) | |
1321 | goto unwind; | |
1322 | } | |
1323 | ||
1324 | return 0; | |
1325 | ||
1326 | unwind: | |
1327 | memcpy(sa.sa_data, bond->dev->dev_addr, bond->dev->addr_len); | |
1328 | sa.sa_family = bond->dev->type; | |
1329 | ||
1330 | /* unwind from head to the slave that failed */ | |
1331 | bond_for_each_slave(bond, rollback_slave, iter) { | |
1332 | if (rollback_slave == slave) | |
1333 | break; | |
1334 | ether_addr_copy(tmp_addr, rollback_slave->dev->dev_addr); | |
1335 | dev_set_mac_address(rollback_slave->dev, &sa); | |
1336 | ether_addr_copy(rollback_slave->dev->dev_addr, tmp_addr); | |
1337 | } | |
1338 | ||
1339 | return res; | |
1340 | } | |
1341 | ||
1342 | /************************ exported alb funcions ************************/ | |
1343 | ||
1344 | int bond_alb_initialize(struct bonding *bond, int rlb_enabled) | |
1345 | { | |
1346 | int res; | |
1347 | ||
1348 | res = tlb_initialize(bond); | |
1349 | if (res) | |
1350 | return res; | |
1351 | ||
1352 | if (rlb_enabled) { | |
1353 | bond->alb_info.rlb_enabled = 1; | |
1354 | /* initialize rlb */ | |
1355 | res = rlb_initialize(bond); | |
1356 | if (res) { | |
1357 | tlb_deinitialize(bond); | |
1358 | return res; | |
1359 | } | |
1360 | } else { | |
1361 | bond->alb_info.rlb_enabled = 0; | |
1362 | } | |
1363 | ||
1364 | return 0; | |
1365 | } | |
1366 | ||
1367 | void bond_alb_deinitialize(struct bonding *bond) | |
1368 | { | |
1369 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1370 | ||
1371 | tlb_deinitialize(bond); | |
1372 | ||
1373 | if (bond_info->rlb_enabled) | |
1374 | rlb_deinitialize(bond); | |
1375 | } | |
1376 | ||
1377 | static int bond_do_alb_xmit(struct sk_buff *skb, struct bonding *bond, | |
1378 | struct slave *tx_slave) | |
1379 | { | |
1380 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1381 | struct ethhdr *eth_data = eth_hdr(skb); | |
1382 | ||
1383 | if (!tx_slave) { | |
1384 | /* unbalanced or unassigned, send through primary */ | |
1385 | tx_slave = rcu_dereference(bond->curr_active_slave); | |
1386 | if (bond->params.tlb_dynamic_lb) | |
1387 | bond_info->unbalanced_load += skb->len; | |
1388 | } | |
1389 | ||
1390 | if (tx_slave && bond_slave_can_tx(tx_slave)) { | |
1391 | if (tx_slave != rcu_access_pointer(bond->curr_active_slave)) { | |
1392 | ether_addr_copy(eth_data->h_source, | |
1393 | tx_slave->dev->dev_addr); | |
1394 | } | |
1395 | ||
1396 | bond_dev_queue_xmit(bond, skb, tx_slave->dev); | |
1397 | goto out; | |
1398 | } | |
1399 | ||
1400 | if (tx_slave && bond->params.tlb_dynamic_lb) { | |
1401 | _lock_tx_hashtbl(bond); | |
1402 | __tlb_clear_slave(bond, tx_slave, 0); | |
1403 | _unlock_tx_hashtbl(bond); | |
1404 | } | |
1405 | ||
1406 | /* no suitable interface, frame not sent */ | |
1407 | dev_kfree_skb_any(skb); | |
1408 | out: | |
1409 | return NETDEV_TX_OK; | |
1410 | } | |
1411 | ||
1412 | static int bond_tlb_update_slave_arr(struct bonding *bond, | |
1413 | struct slave *skipslave) | |
1414 | { | |
1415 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1416 | struct slave *tx_slave; | |
1417 | struct list_head *iter; | |
1418 | struct tlb_up_slave *new_arr, *old_arr; | |
1419 | ||
1420 | new_arr = kzalloc(offsetof(struct tlb_up_slave, arr[bond->slave_cnt]), | |
1421 | GFP_ATOMIC); | |
1422 | if (!new_arr) | |
1423 | return -ENOMEM; | |
1424 | ||
1425 | bond_for_each_slave(bond, tx_slave, iter) { | |
1426 | if (!bond_slave_can_tx(tx_slave)) | |
1427 | continue; | |
1428 | if (skipslave == tx_slave) | |
1429 | continue; | |
1430 | new_arr->arr[new_arr->count++] = tx_slave; | |
1431 | } | |
1432 | ||
1433 | old_arr = rtnl_dereference(bond_info->slave_arr); | |
1434 | rcu_assign_pointer(bond_info->slave_arr, new_arr); | |
1435 | if (old_arr) | |
1436 | kfree_rcu(old_arr, rcu); | |
1437 | ||
1438 | return 0; | |
1439 | } | |
1440 | ||
1441 | int bond_tlb_xmit(struct sk_buff *skb, struct net_device *bond_dev) | |
1442 | { | |
1443 | struct bonding *bond = netdev_priv(bond_dev); | |
1444 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1445 | struct ethhdr *eth_data; | |
1446 | struct slave *tx_slave = NULL; | |
1447 | u32 hash_index; | |
1448 | ||
1449 | skb_reset_mac_header(skb); | |
1450 | eth_data = eth_hdr(skb); | |
1451 | ||
1452 | /* Do not TX balance any multicast or broadcast */ | |
1453 | if (!is_multicast_ether_addr(eth_data->h_dest)) { | |
1454 | switch (skb->protocol) { | |
1455 | case htons(ETH_P_IP): | |
1456 | case htons(ETH_P_IPX): | |
1457 | /* In case of IPX, it will falback to L2 hash */ | |
1458 | case htons(ETH_P_IPV6): | |
1459 | hash_index = bond_xmit_hash(bond, skb); | |
1460 | if (bond->params.tlb_dynamic_lb) { | |
1461 | tx_slave = tlb_choose_channel(bond, | |
1462 | hash_index & 0xFF, | |
1463 | skb->len); | |
1464 | } else { | |
1465 | struct tlb_up_slave *slaves; | |
1466 | ||
1467 | slaves = rcu_dereference(bond_info->slave_arr); | |
1468 | if (slaves && slaves->count) | |
1469 | tx_slave = slaves->arr[hash_index % | |
1470 | slaves->count]; | |
1471 | } | |
1472 | break; | |
1473 | } | |
1474 | } | |
1475 | return bond_do_alb_xmit(skb, bond, tx_slave); | |
1476 | } | |
1477 | ||
1478 | int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev) | |
1479 | { | |
1480 | struct bonding *bond = netdev_priv(bond_dev); | |
1481 | struct ethhdr *eth_data; | |
1482 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1483 | struct slave *tx_slave = NULL; | |
1484 | static const __be32 ip_bcast = htonl(0xffffffff); | |
1485 | int hash_size = 0; | |
1486 | bool do_tx_balance = true; | |
1487 | u32 hash_index = 0; | |
1488 | const u8 *hash_start = NULL; | |
1489 | struct ipv6hdr *ip6hdr; | |
1490 | ||
1491 | skb_reset_mac_header(skb); | |
1492 | eth_data = eth_hdr(skb); | |
1493 | ||
1494 | switch (ntohs(skb->protocol)) { | |
1495 | case ETH_P_IP: { | |
1496 | const struct iphdr *iph = ip_hdr(skb); | |
1497 | ||
1498 | if (ether_addr_equal_64bits(eth_data->h_dest, mac_bcast) || | |
1499 | (iph->daddr == ip_bcast) || | |
1500 | (iph->protocol == IPPROTO_IGMP)) { | |
1501 | do_tx_balance = false; | |
1502 | break; | |
1503 | } | |
1504 | hash_start = (char *)&(iph->daddr); | |
1505 | hash_size = sizeof(iph->daddr); | |
1506 | } | |
1507 | break; | |
1508 | case ETH_P_IPV6: | |
1509 | /* IPv6 doesn't really use broadcast mac address, but leave | |
1510 | * that here just in case. | |
1511 | */ | |
1512 | if (ether_addr_equal_64bits(eth_data->h_dest, mac_bcast)) { | |
1513 | do_tx_balance = false; | |
1514 | break; | |
1515 | } | |
1516 | ||
1517 | /* IPv6 uses all-nodes multicast as an equivalent to | |
1518 | * broadcasts in IPv4. | |
1519 | */ | |
1520 | if (ether_addr_equal_64bits(eth_data->h_dest, mac_v6_allmcast)) { | |
1521 | do_tx_balance = false; | |
1522 | break; | |
1523 | } | |
1524 | ||
1525 | /* Additianally, DAD probes should not be tx-balanced as that | |
1526 | * will lead to false positives for duplicate addresses and | |
1527 | * prevent address configuration from working. | |
1528 | */ | |
1529 | ip6hdr = ipv6_hdr(skb); | |
1530 | if (ipv6_addr_any(&ip6hdr->saddr)) { | |
1531 | do_tx_balance = false; | |
1532 | break; | |
1533 | } | |
1534 | ||
1535 | hash_start = (char *)&(ipv6_hdr(skb)->daddr); | |
1536 | hash_size = sizeof(ipv6_hdr(skb)->daddr); | |
1537 | break; | |
1538 | case ETH_P_IPX: | |
1539 | if (ipx_hdr(skb)->ipx_checksum != IPX_NO_CHECKSUM) { | |
1540 | /* something is wrong with this packet */ | |
1541 | do_tx_balance = false; | |
1542 | break; | |
1543 | } | |
1544 | ||
1545 | if (ipx_hdr(skb)->ipx_type != IPX_TYPE_NCP) { | |
1546 | /* The only protocol worth balancing in | |
1547 | * this family since it has an "ARP" like | |
1548 | * mechanism | |
1549 | */ | |
1550 | do_tx_balance = false; | |
1551 | break; | |
1552 | } | |
1553 | ||
1554 | hash_start = (char *)eth_data->h_dest; | |
1555 | hash_size = ETH_ALEN; | |
1556 | break; | |
1557 | case ETH_P_ARP: | |
1558 | do_tx_balance = false; | |
1559 | if (bond_info->rlb_enabled) | |
1560 | tx_slave = rlb_arp_xmit(skb, bond); | |
1561 | break; | |
1562 | default: | |
1563 | do_tx_balance = false; | |
1564 | break; | |
1565 | } | |
1566 | ||
1567 | if (do_tx_balance) { | |
1568 | hash_index = _simple_hash(hash_start, hash_size); | |
1569 | tx_slave = tlb_choose_channel(bond, hash_index, skb->len); | |
1570 | } | |
1571 | ||
1572 | return bond_do_alb_xmit(skb, bond, tx_slave); | |
1573 | } | |
1574 | ||
1575 | void bond_alb_monitor(struct work_struct *work) | |
1576 | { | |
1577 | struct bonding *bond = container_of(work, struct bonding, | |
1578 | alb_work.work); | |
1579 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1580 | struct list_head *iter; | |
1581 | struct slave *slave; | |
1582 | ||
1583 | if (!bond_has_slaves(bond)) { | |
1584 | bond_info->tx_rebalance_counter = 0; | |
1585 | bond_info->lp_counter = 0; | |
1586 | goto re_arm; | |
1587 | } | |
1588 | ||
1589 | rcu_read_lock(); | |
1590 | ||
1591 | bond_info->tx_rebalance_counter++; | |
1592 | bond_info->lp_counter++; | |
1593 | ||
1594 | /* send learning packets */ | |
1595 | if (bond_info->lp_counter >= BOND_ALB_LP_TICKS(bond)) { | |
1596 | bool strict_match; | |
1597 | ||
1598 | /* change of curr_active_slave involves swapping of mac addresses. | |
1599 | * in order to avoid this swapping from happening while | |
1600 | * sending the learning packets, the curr_slave_lock must be held for | |
1601 | * read. | |
1602 | */ | |
1603 | read_lock(&bond->curr_slave_lock); | |
1604 | ||
1605 | bond_for_each_slave_rcu(bond, slave, iter) { | |
1606 | /* If updating current_active, use all currently | |
1607 | * user mac addreses (!strict_match). Otherwise, only | |
1608 | * use mac of the slave device. | |
1609 | * In RLB mode, we always use strict matches. | |
1610 | */ | |
1611 | strict_match = (slave != rcu_access_pointer(bond->curr_active_slave) || | |
1612 | bond_info->rlb_enabled); | |
1613 | alb_send_learning_packets(slave, slave->dev->dev_addr, | |
1614 | strict_match); | |
1615 | } | |
1616 | ||
1617 | read_unlock(&bond->curr_slave_lock); | |
1618 | ||
1619 | bond_info->lp_counter = 0; | |
1620 | } | |
1621 | ||
1622 | /* rebalance tx traffic */ | |
1623 | if (bond_info->tx_rebalance_counter >= BOND_TLB_REBALANCE_TICKS) { | |
1624 | ||
1625 | read_lock(&bond->curr_slave_lock); | |
1626 | ||
1627 | bond_for_each_slave_rcu(bond, slave, iter) { | |
1628 | tlb_clear_slave(bond, slave, 1); | |
1629 | if (slave == rcu_access_pointer(bond->curr_active_slave)) { | |
1630 | SLAVE_TLB_INFO(slave).load = | |
1631 | bond_info->unbalanced_load / | |
1632 | BOND_TLB_REBALANCE_INTERVAL; | |
1633 | bond_info->unbalanced_load = 0; | |
1634 | } | |
1635 | } | |
1636 | ||
1637 | read_unlock(&bond->curr_slave_lock); | |
1638 | ||
1639 | bond_info->tx_rebalance_counter = 0; | |
1640 | } | |
1641 | ||
1642 | /* handle rlb stuff */ | |
1643 | if (bond_info->rlb_enabled) { | |
1644 | if (bond_info->primary_is_promisc && | |
1645 | (++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) { | |
1646 | ||
1647 | /* | |
1648 | * dev_set_promiscuity requires rtnl and | |
1649 | * nothing else. Avoid race with bond_close. | |
1650 | */ | |
1651 | rcu_read_unlock(); | |
1652 | if (!rtnl_trylock()) | |
1653 | goto re_arm; | |
1654 | ||
1655 | bond_info->rlb_promisc_timeout_counter = 0; | |
1656 | ||
1657 | /* If the primary was set to promiscuous mode | |
1658 | * because a slave was disabled then | |
1659 | * it can now leave promiscuous mode. | |
1660 | */ | |
1661 | dev_set_promiscuity(rtnl_dereference(bond->curr_active_slave)->dev, | |
1662 | -1); | |
1663 | bond_info->primary_is_promisc = 0; | |
1664 | ||
1665 | rtnl_unlock(); | |
1666 | rcu_read_lock(); | |
1667 | } | |
1668 | ||
1669 | if (bond_info->rlb_rebalance) { | |
1670 | bond_info->rlb_rebalance = 0; | |
1671 | rlb_rebalance(bond); | |
1672 | } | |
1673 | ||
1674 | /* check if clients need updating */ | |
1675 | if (bond_info->rx_ntt) { | |
1676 | if (bond_info->rlb_update_delay_counter) { | |
1677 | --bond_info->rlb_update_delay_counter; | |
1678 | } else { | |
1679 | rlb_update_rx_clients(bond); | |
1680 | if (bond_info->rlb_update_retry_counter) | |
1681 | --bond_info->rlb_update_retry_counter; | |
1682 | else | |
1683 | bond_info->rx_ntt = 0; | |
1684 | } | |
1685 | } | |
1686 | } | |
1687 | rcu_read_unlock(); | |
1688 | re_arm: | |
1689 | queue_delayed_work(bond->wq, &bond->alb_work, alb_delta_in_ticks); | |
1690 | } | |
1691 | ||
1692 | /* assumption: called before the slave is attached to the bond | |
1693 | * and not locked by the bond lock | |
1694 | */ | |
1695 | int bond_alb_init_slave(struct bonding *bond, struct slave *slave) | |
1696 | { | |
1697 | int res; | |
1698 | ||
1699 | res = alb_set_slave_mac_addr(slave, slave->perm_hwaddr); | |
1700 | if (res) | |
1701 | return res; | |
1702 | ||
1703 | res = alb_handle_addr_collision_on_attach(bond, slave); | |
1704 | if (res) | |
1705 | return res; | |
1706 | ||
1707 | tlb_init_slave(slave); | |
1708 | ||
1709 | /* order a rebalance ASAP */ | |
1710 | bond->alb_info.tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS; | |
1711 | ||
1712 | if (bond->alb_info.rlb_enabled) | |
1713 | bond->alb_info.rlb_rebalance = 1; | |
1714 | ||
1715 | return 0; | |
1716 | } | |
1717 | ||
1718 | /* | |
1719 | * Remove slave from tlb and rlb hash tables, and fix up MAC addresses | |
1720 | * if necessary. | |
1721 | * | |
1722 | * Caller must hold RTNL and no other locks | |
1723 | */ | |
1724 | void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave) | |
1725 | { | |
1726 | if (bond_has_slaves(bond)) | |
1727 | alb_change_hw_addr_on_detach(bond, slave); | |
1728 | ||
1729 | tlb_clear_slave(bond, slave, 0); | |
1730 | ||
1731 | if (bond->alb_info.rlb_enabled) { | |
1732 | bond->alb_info.rx_slave = NULL; | |
1733 | rlb_clear_slave(bond, slave); | |
1734 | } | |
1735 | ||
1736 | if (bond_is_nondyn_tlb(bond)) | |
1737 | if (bond_tlb_update_slave_arr(bond, slave)) | |
1738 | pr_err("Failed to build slave-array for TLB mode.\n"); | |
1739 | ||
1740 | } | |
1741 | ||
1742 | /* Caller must hold bond lock for read */ | |
1743 | void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link) | |
1744 | { | |
1745 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1746 | ||
1747 | if (link == BOND_LINK_DOWN) { | |
1748 | tlb_clear_slave(bond, slave, 0); | |
1749 | if (bond->alb_info.rlb_enabled) | |
1750 | rlb_clear_slave(bond, slave); | |
1751 | } else if (link == BOND_LINK_UP) { | |
1752 | /* order a rebalance ASAP */ | |
1753 | bond_info->tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS; | |
1754 | if (bond->alb_info.rlb_enabled) { | |
1755 | bond->alb_info.rlb_rebalance = 1; | |
1756 | /* If the updelay module parameter is smaller than the | |
1757 | * forwarding delay of the switch the rebalance will | |
1758 | * not work because the rebalance arp replies will | |
1759 | * not be forwarded to the clients.. | |
1760 | */ | |
1761 | } | |
1762 | } | |
1763 | ||
1764 | if (bond_is_nondyn_tlb(bond)) { | |
1765 | if (bond_tlb_update_slave_arr(bond, NULL)) | |
1766 | pr_err("Failed to build slave-array for TLB mode.\n"); | |
1767 | } | |
1768 | } | |
1769 | ||
1770 | /** | |
1771 | * bond_alb_handle_active_change - assign new curr_active_slave | |
1772 | * @bond: our bonding struct | |
1773 | * @new_slave: new slave to assign | |
1774 | * | |
1775 | * Set the bond->curr_active_slave to @new_slave and handle | |
1776 | * mac address swapping and promiscuity changes as needed. | |
1777 | * | |
1778 | * If new_slave is NULL, caller must hold curr_slave_lock or | |
1779 | * bond->lock for write. | |
1780 | * | |
1781 | * If new_slave is not NULL, caller must hold RTNL, curr_slave_lock | |
1782 | * for write. Processing here may sleep, so no other locks may be held. | |
1783 | */ | |
1784 | void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave) | |
1785 | __releases(&bond->curr_slave_lock) | |
1786 | __acquires(&bond->curr_slave_lock) | |
1787 | { | |
1788 | struct slave *swap_slave; | |
1789 | struct slave *curr_active; | |
1790 | ||
1791 | curr_active = rcu_dereference_protected(bond->curr_active_slave, | |
1792 | !new_slave || | |
1793 | lockdep_is_held(&bond->curr_slave_lock)); | |
1794 | if (curr_active == new_slave) | |
1795 | return; | |
1796 | ||
1797 | if (curr_active && bond->alb_info.primary_is_promisc) { | |
1798 | dev_set_promiscuity(curr_active->dev, -1); | |
1799 | bond->alb_info.primary_is_promisc = 0; | |
1800 | bond->alb_info.rlb_promisc_timeout_counter = 0; | |
1801 | } | |
1802 | ||
1803 | swap_slave = curr_active; | |
1804 | rcu_assign_pointer(bond->curr_active_slave, new_slave); | |
1805 | ||
1806 | if (!new_slave || !bond_has_slaves(bond)) | |
1807 | return; | |
1808 | ||
1809 | /* set the new curr_active_slave to the bonds mac address | |
1810 | * i.e. swap mac addresses of old curr_active_slave and new curr_active_slave | |
1811 | */ | |
1812 | if (!swap_slave) | |
1813 | swap_slave = bond_slave_has_mac(bond, bond->dev->dev_addr); | |
1814 | ||
1815 | /* | |
1816 | * Arrange for swap_slave and new_slave to temporarily be | |
1817 | * ignored so we can mess with their MAC addresses without | |
1818 | * fear of interference from transmit activity. | |
1819 | */ | |
1820 | if (swap_slave) | |
1821 | tlb_clear_slave(bond, swap_slave, 1); | |
1822 | tlb_clear_slave(bond, new_slave, 1); | |
1823 | ||
1824 | write_unlock_bh(&bond->curr_slave_lock); | |
1825 | ||
1826 | ASSERT_RTNL(); | |
1827 | ||
1828 | /* in TLB mode, the slave might flip down/up with the old dev_addr, | |
1829 | * and thus filter bond->dev_addr's packets, so force bond's mac | |
1830 | */ | |
1831 | if (BOND_MODE(bond) == BOND_MODE_TLB) { | |
1832 | struct sockaddr sa; | |
1833 | u8 tmp_addr[ETH_ALEN]; | |
1834 | ||
1835 | ether_addr_copy(tmp_addr, new_slave->dev->dev_addr); | |
1836 | ||
1837 | memcpy(sa.sa_data, bond->dev->dev_addr, bond->dev->addr_len); | |
1838 | sa.sa_family = bond->dev->type; | |
1839 | /* we don't care if it can't change its mac, best effort */ | |
1840 | dev_set_mac_address(new_slave->dev, &sa); | |
1841 | ||
1842 | ether_addr_copy(new_slave->dev->dev_addr, tmp_addr); | |
1843 | } | |
1844 | ||
1845 | /* curr_active_slave must be set before calling alb_swap_mac_addr */ | |
1846 | if (swap_slave) { | |
1847 | /* swap mac address */ | |
1848 | alb_swap_mac_addr(swap_slave, new_slave); | |
1849 | alb_fasten_mac_swap(bond, swap_slave, new_slave); | |
1850 | } else { | |
1851 | /* set the new_slave to the bond mac address */ | |
1852 | alb_set_slave_mac_addr(new_slave, bond->dev->dev_addr); | |
1853 | alb_send_learning_packets(new_slave, bond->dev->dev_addr, | |
1854 | false); | |
1855 | } | |
1856 | ||
1857 | write_lock_bh(&bond->curr_slave_lock); | |
1858 | } | |
1859 | ||
1860 | /* | |
1861 | * Called with RTNL | |
1862 | */ | |
1863 | int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr) | |
1864 | __acquires(&bond->lock) | |
1865 | __releases(&bond->lock) | |
1866 | { | |
1867 | struct bonding *bond = netdev_priv(bond_dev); | |
1868 | struct sockaddr *sa = addr; | |
1869 | struct slave *curr_active; | |
1870 | struct slave *swap_slave; | |
1871 | int res; | |
1872 | ||
1873 | if (!is_valid_ether_addr(sa->sa_data)) | |
1874 | return -EADDRNOTAVAIL; | |
1875 | ||
1876 | res = alb_set_mac_address(bond, addr); | |
1877 | if (res) | |
1878 | return res; | |
1879 | ||
1880 | memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len); | |
1881 | ||
1882 | /* If there is no curr_active_slave there is nothing else to do. | |
1883 | * Otherwise we'll need to pass the new address to it and handle | |
1884 | * duplications. | |
1885 | */ | |
1886 | curr_active = rtnl_dereference(bond->curr_active_slave); | |
1887 | if (!curr_active) | |
1888 | return 0; | |
1889 | ||
1890 | swap_slave = bond_slave_has_mac(bond, bond_dev->dev_addr); | |
1891 | ||
1892 | if (swap_slave) { | |
1893 | alb_swap_mac_addr(swap_slave, curr_active); | |
1894 | alb_fasten_mac_swap(bond, swap_slave, curr_active); | |
1895 | } else { | |
1896 | alb_set_slave_mac_addr(curr_active, bond_dev->dev_addr); | |
1897 | ||
1898 | read_lock(&bond->lock); | |
1899 | alb_send_learning_packets(curr_active, | |
1900 | bond_dev->dev_addr, false); | |
1901 | if (bond->alb_info.rlb_enabled) { | |
1902 | /* inform clients mac address has changed */ | |
1903 | rlb_req_update_slave_clients(bond, curr_active); | |
1904 | } | |
1905 | read_unlock(&bond->lock); | |
1906 | } | |
1907 | ||
1908 | return 0; | |
1909 | } | |
1910 | ||
1911 | void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id) | |
1912 | { | |
1913 | if (bond->alb_info.rlb_enabled) | |
1914 | rlb_clear_vlan(bond, vlan_id); | |
1915 | } | |
1916 |