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1da177e4 LT |
1 | /* |
2 | * Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License as published by the | |
6 | * Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but | |
10 | * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
11 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 | * for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along | |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
17 | * | |
18 | * The full GNU General Public License is included in this distribution in the | |
19 | * file called LICENSE. | |
20 | * | |
1da177e4 LT |
21 | */ |
22 | ||
a4aee5c8 JP |
23 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
24 | ||
1da177e4 LT |
25 | #include <linux/skbuff.h> |
26 | #include <linux/netdevice.h> | |
27 | #include <linux/etherdevice.h> | |
28 | #include <linux/pkt_sched.h> | |
29 | #include <linux/spinlock.h> | |
30 | #include <linux/slab.h> | |
31 | #include <linux/timer.h> | |
32 | #include <linux/ip.h> | |
33 | #include <linux/ipv6.h> | |
34 | #include <linux/if_arp.h> | |
35 | #include <linux/if_ether.h> | |
36 | #include <linux/if_bonding.h> | |
37 | #include <linux/if_vlan.h> | |
38 | #include <linux/in.h> | |
39 | #include <net/ipx.h> | |
40 | #include <net/arp.h> | |
2d1ea19d | 41 | #include <net/ipv6.h> |
1da177e4 LT |
42 | #include <asm/byteorder.h> |
43 | #include "bonding.h" | |
44 | #include "bond_alb.h" | |
45 | ||
46 | ||
1da177e4 | 47 | |
885a136c ED |
48 | #ifndef __long_aligned |
49 | #define __long_aligned __attribute__((aligned((sizeof(long))))) | |
50 | #endif | |
51 | static const u8 mac_bcast[ETH_ALEN] __long_aligned = { | |
52 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff | |
53 | }; | |
54 | static const u8 mac_v6_allmcast[ETH_ALEN] __long_aligned = { | |
55 | 0x33, 0x33, 0x00, 0x00, 0x00, 0x01 | |
56 | }; | |
1da177e4 LT |
57 | static const int alb_delta_in_ticks = HZ / ALB_TIMER_TICKS_PER_SEC; |
58 | ||
59 | #pragma pack(1) | |
60 | struct learning_pkt { | |
61 | u8 mac_dst[ETH_ALEN]; | |
62 | u8 mac_src[ETH_ALEN]; | |
d3bb52b0 | 63 | __be16 type; |
1da177e4 LT |
64 | u8 padding[ETH_ZLEN - ETH_HLEN]; |
65 | }; | |
66 | ||
67 | struct arp_pkt { | |
d3bb52b0 AV |
68 | __be16 hw_addr_space; |
69 | __be16 prot_addr_space; | |
1da177e4 LT |
70 | u8 hw_addr_len; |
71 | u8 prot_addr_len; | |
d3bb52b0 | 72 | __be16 op_code; |
1da177e4 | 73 | u8 mac_src[ETH_ALEN]; /* sender hardware address */ |
d3bb52b0 | 74 | __be32 ip_src; /* sender IP address */ |
1da177e4 | 75 | u8 mac_dst[ETH_ALEN]; /* target hardware address */ |
d3bb52b0 | 76 | __be32 ip_dst; /* target IP address */ |
1da177e4 LT |
77 | }; |
78 | #pragma pack() | |
79 | ||
a16aeb36 ACM |
80 | static inline struct arp_pkt *arp_pkt(const struct sk_buff *skb) |
81 | { | |
d56f90a7 | 82 | return (struct arp_pkt *)skb_network_header(skb); |
a16aeb36 ACM |
83 | } |
84 | ||
1da177e4 LT |
85 | /* Forward declaration */ |
86 | static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[]); | |
87 | ||
eddc9ec5 | 88 | static inline u8 _simple_hash(const u8 *hash_start, int hash_size) |
1da177e4 LT |
89 | { |
90 | int i; | |
91 | u8 hash = 0; | |
92 | ||
93 | for (i = 0; i < hash_size; i++) { | |
94 | hash ^= hash_start[i]; | |
95 | } | |
96 | ||
97 | return hash; | |
98 | } | |
99 | ||
100 | /*********************** tlb specific functions ***************************/ | |
101 | ||
f515e6b7 | 102 | static inline void _lock_tx_hashtbl_bh(struct bonding *bond) |
1da177e4 | 103 | { |
6603a6f2 | 104 | spin_lock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock)); |
1da177e4 LT |
105 | } |
106 | ||
f515e6b7 | 107 | static inline void _unlock_tx_hashtbl_bh(struct bonding *bond) |
1da177e4 | 108 | { |
6603a6f2 | 109 | spin_unlock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock)); |
1da177e4 LT |
110 | } |
111 | ||
f515e6b7 MU |
112 | static inline void _lock_tx_hashtbl(struct bonding *bond) |
113 | { | |
114 | spin_lock(&(BOND_ALB_INFO(bond).tx_hashtbl_lock)); | |
115 | } | |
116 | ||
117 | static inline void _unlock_tx_hashtbl(struct bonding *bond) | |
118 | { | |
119 | spin_unlock(&(BOND_ALB_INFO(bond).tx_hashtbl_lock)); | |
120 | } | |
121 | ||
1da177e4 LT |
122 | /* Caller must hold tx_hashtbl lock */ |
123 | static inline void tlb_init_table_entry(struct tlb_client_info *entry, int save_load) | |
124 | { | |
125 | if (save_load) { | |
126 | entry->load_history = 1 + entry->tx_bytes / | |
127 | BOND_TLB_REBALANCE_INTERVAL; | |
128 | entry->tx_bytes = 0; | |
129 | } | |
130 | ||
131 | entry->tx_slave = NULL; | |
132 | entry->next = TLB_NULL_INDEX; | |
133 | entry->prev = TLB_NULL_INDEX; | |
134 | } | |
135 | ||
136 | static inline void tlb_init_slave(struct slave *slave) | |
137 | { | |
138 | SLAVE_TLB_INFO(slave).load = 0; | |
139 | SLAVE_TLB_INFO(slave).head = TLB_NULL_INDEX; | |
140 | } | |
141 | ||
f515e6b7 MU |
142 | /* Caller must hold bond lock for read, BH disabled */ |
143 | static void __tlb_clear_slave(struct bonding *bond, struct slave *slave, | |
144 | int save_load) | |
1da177e4 LT |
145 | { |
146 | struct tlb_client_info *tx_hash_table; | |
147 | u32 index; | |
148 | ||
1da177e4 LT |
149 | /* clear slave from tx_hashtbl */ |
150 | tx_hash_table = BOND_ALB_INFO(bond).tx_hashtbl; | |
151 | ||
ce39a800 AG |
152 | /* skip this if we've already freed the tx hash table */ |
153 | if (tx_hash_table) { | |
154 | index = SLAVE_TLB_INFO(slave).head; | |
155 | while (index != TLB_NULL_INDEX) { | |
156 | u32 next_index = tx_hash_table[index].next; | |
157 | tlb_init_table_entry(&tx_hash_table[index], save_load); | |
158 | index = next_index; | |
159 | } | |
1da177e4 LT |
160 | } |
161 | ||
1da177e4 | 162 | tlb_init_slave(slave); |
f515e6b7 | 163 | } |
5af47b2f | 164 | |
f515e6b7 MU |
165 | /* Caller must hold bond lock for read */ |
166 | static void tlb_clear_slave(struct bonding *bond, struct slave *slave, | |
167 | int save_load) | |
168 | { | |
169 | _lock_tx_hashtbl_bh(bond); | |
170 | __tlb_clear_slave(bond, slave, save_load); | |
171 | _unlock_tx_hashtbl_bh(bond); | |
1da177e4 LT |
172 | } |
173 | ||
174 | /* Must be called before starting the monitor timer */ | |
175 | static int tlb_initialize(struct bonding *bond) | |
176 | { | |
177 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
178 | int size = TLB_HASH_TABLE_SIZE * sizeof(struct tlb_client_info); | |
0d206a3a | 179 | struct tlb_client_info *new_hashtbl; |
1da177e4 LT |
180 | int i; |
181 | ||
243cb4e5 | 182 | new_hashtbl = kzalloc(size, GFP_KERNEL); |
e404decb | 183 | if (!new_hashtbl) |
1da177e4 | 184 | return -1; |
e404decb | 185 | |
f515e6b7 | 186 | _lock_tx_hashtbl_bh(bond); |
0d206a3a MW |
187 | |
188 | bond_info->tx_hashtbl = new_hashtbl; | |
1da177e4 | 189 | |
1da177e4 | 190 | for (i = 0; i < TLB_HASH_TABLE_SIZE; i++) { |
38dbaf0a | 191 | tlb_init_table_entry(&bond_info->tx_hashtbl[i], 0); |
1da177e4 LT |
192 | } |
193 | ||
f515e6b7 | 194 | _unlock_tx_hashtbl_bh(bond); |
1da177e4 LT |
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 | ||
f515e6b7 | 204 | _lock_tx_hashtbl_bh(bond); |
1da177e4 LT |
205 | |
206 | kfree(bond_info->tx_hashtbl); | |
207 | bond_info->tx_hashtbl = NULL; | |
208 | ||
f515e6b7 | 209 | _unlock_tx_hashtbl_bh(bond); |
1da177e4 LT |
210 | } |
211 | ||
097811bb JP |
212 | static long long compute_gap(struct slave *slave) |
213 | { | |
214 | return (s64) (slave->speed << 20) - /* Convert to Megabit per sec */ | |
215 | (s64) (SLAVE_TLB_INFO(slave).load << 3); /* Bytes to bits */ | |
216 | } | |
217 | ||
1da177e4 LT |
218 | /* Caller must hold bond lock for read */ |
219 | static struct slave *tlb_get_least_loaded_slave(struct bonding *bond) | |
220 | { | |
221 | struct slave *slave, *least_loaded; | |
097811bb JP |
222 | long long max_gap; |
223 | int i; | |
1da177e4 | 224 | |
097811bb JP |
225 | least_loaded = NULL; |
226 | max_gap = LLONG_MIN; | |
1da177e4 LT |
227 | |
228 | /* Find the slave with the largest gap */ | |
097811bb | 229 | bond_for_each_slave(bond, slave, i) { |
1da177e4 | 230 | if (SLAVE_IS_OK(slave)) { |
097811bb JP |
231 | long long gap = compute_gap(slave); |
232 | ||
1da177e4 LT |
233 | if (max_gap < gap) { |
234 | least_loaded = slave; | |
235 | max_gap = gap; | |
236 | } | |
237 | } | |
238 | } | |
239 | ||
240 | return least_loaded; | |
241 | } | |
242 | ||
f515e6b7 MU |
243 | static struct slave *__tlb_choose_channel(struct bonding *bond, u32 hash_index, |
244 | u32 skb_len) | |
1da177e4 LT |
245 | { |
246 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
247 | struct tlb_client_info *hash_table; | |
248 | struct slave *assigned_slave; | |
249 | ||
1da177e4 LT |
250 | hash_table = bond_info->tx_hashtbl; |
251 | assigned_slave = hash_table[hash_index].tx_slave; | |
252 | if (!assigned_slave) { | |
253 | assigned_slave = tlb_get_least_loaded_slave(bond); | |
254 | ||
255 | if (assigned_slave) { | |
256 | struct tlb_slave_info *slave_info = | |
257 | &(SLAVE_TLB_INFO(assigned_slave)); | |
258 | u32 next_index = slave_info->head; | |
259 | ||
260 | hash_table[hash_index].tx_slave = assigned_slave; | |
261 | hash_table[hash_index].next = next_index; | |
262 | hash_table[hash_index].prev = TLB_NULL_INDEX; | |
263 | ||
264 | if (next_index != TLB_NULL_INDEX) { | |
265 | hash_table[next_index].prev = hash_index; | |
266 | } | |
267 | ||
268 | slave_info->head = hash_index; | |
269 | slave_info->load += | |
270 | hash_table[hash_index].load_history; | |
271 | } | |
272 | } | |
273 | ||
274 | if (assigned_slave) { | |
275 | hash_table[hash_index].tx_bytes += skb_len; | |
276 | } | |
277 | ||
1da177e4 LT |
278 | return assigned_slave; |
279 | } | |
280 | ||
f515e6b7 MU |
281 | /* Caller must hold bond lock for read */ |
282 | static 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 | ||
1da177e4 | 297 | /*********************** rlb specific functions ***************************/ |
f515e6b7 | 298 | static inline void _lock_rx_hashtbl_bh(struct bonding *bond) |
1da177e4 | 299 | { |
6603a6f2 | 300 | spin_lock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock)); |
1da177e4 LT |
301 | } |
302 | ||
f515e6b7 | 303 | static inline void _unlock_rx_hashtbl_bh(struct bonding *bond) |
1da177e4 | 304 | { |
6603a6f2 | 305 | spin_unlock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock)); |
1da177e4 LT |
306 | } |
307 | ||
f515e6b7 MU |
308 | static inline void _lock_rx_hashtbl(struct bonding *bond) |
309 | { | |
310 | spin_lock(&(BOND_ALB_INFO(bond).rx_hashtbl_lock)); | |
311 | } | |
312 | ||
313 | static inline void _unlock_rx_hashtbl(struct bonding *bond) | |
314 | { | |
315 | spin_unlock(&(BOND_ALB_INFO(bond).rx_hashtbl_lock)); | |
316 | } | |
317 | ||
1da177e4 LT |
318 | /* when an ARP REPLY is received from a client update its info |
319 | * in the rx_hashtbl | |
320 | */ | |
321 | static 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 | ||
f515e6b7 | 327 | _lock_rx_hashtbl_bh(bond); |
1da177e4 LT |
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) && | |
42d782ac FL |
334 | (client_info->ip_dst == arp->ip_src) && |
335 | (compare_ether_addr_64bits(client_info->mac_dst, arp->mac_src))) { | |
1da177e4 LT |
336 | /* update the clients MAC address */ |
337 | memcpy(client_info->mac_dst, arp->mac_src, ETH_ALEN); | |
338 | client_info->ntt = 1; | |
339 | bond_info->rx_ntt = 1; | |
340 | } | |
341 | ||
f515e6b7 | 342 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 LT |
343 | } |
344 | ||
3aba891d JP |
345 | static void rlb_arp_recv(struct sk_buff *skb, struct bonding *bond, |
346 | struct slave *slave) | |
1da177e4 | 347 | { |
3aba891d | 348 | struct arp_pkt *arp; |
1da177e4 | 349 | |
3aba891d JP |
350 | if (skb->protocol != cpu_to_be16(ETH_P_ARP)) |
351 | return; | |
1da177e4 | 352 | |
3aba891d | 353 | arp = (struct arp_pkt *) skb->data; |
1da177e4 | 354 | if (!arp) { |
5a03cdb7 | 355 | pr_debug("Packet has no ARP data\n"); |
3aba891d | 356 | return; |
1da177e4 LT |
357 | } |
358 | ||
3aba891d JP |
359 | if (!pskb_may_pull(skb, arp_hdr_len(bond->dev))) |
360 | return; | |
ab12811c | 361 | |
1da177e4 | 362 | if (skb->len < sizeof(struct arp_pkt)) { |
5a03cdb7 | 363 | pr_debug("Packet is too small to be an ARP\n"); |
3aba891d | 364 | return; |
1da177e4 LT |
365 | } |
366 | ||
367 | if (arp->op_code == htons(ARPOP_REPLY)) { | |
368 | /* update rx hash table for this ARP */ | |
369 | rlb_update_entry_from_arp(bond, arp); | |
5a03cdb7 | 370 | pr_debug("Server received an ARP Reply from client\n"); |
1da177e4 | 371 | } |
1da177e4 LT |
372 | } |
373 | ||
374 | /* Caller must hold bond lock for read */ | |
375 | static struct slave *rlb_next_rx_slave(struct bonding *bond) | |
376 | { | |
377 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
378 | struct slave *rx_slave, *slave, *start_at; | |
379 | int i = 0; | |
380 | ||
381 | if (bond_info->next_rx_slave) { | |
382 | start_at = bond_info->next_rx_slave; | |
383 | } else { | |
384 | start_at = bond->first_slave; | |
385 | } | |
386 | ||
387 | rx_slave = NULL; | |
388 | ||
389 | bond_for_each_slave_from(bond, slave, i, start_at) { | |
390 | if (SLAVE_IS_OK(slave)) { | |
391 | if (!rx_slave) { | |
392 | rx_slave = slave; | |
393 | } else if (slave->speed > rx_slave->speed) { | |
394 | rx_slave = slave; | |
395 | } | |
396 | } | |
397 | } | |
398 | ||
399 | if (rx_slave) { | |
400 | bond_info->next_rx_slave = rx_slave->next; | |
401 | } | |
402 | ||
403 | return rx_slave; | |
404 | } | |
405 | ||
406 | /* teach the switch the mac of a disabled slave | |
407 | * on the primary for fault tolerance | |
408 | * | |
409 | * Caller must hold bond->curr_slave_lock for write or bond lock for write | |
410 | */ | |
411 | static void rlb_teach_disabled_mac_on_primary(struct bonding *bond, u8 addr[]) | |
412 | { | |
413 | if (!bond->curr_active_slave) { | |
414 | return; | |
415 | } | |
416 | ||
417 | if (!bond->alb_info.primary_is_promisc) { | |
7e1a1ac1 WC |
418 | if (!dev_set_promiscuity(bond->curr_active_slave->dev, 1)) |
419 | bond->alb_info.primary_is_promisc = 1; | |
420 | else | |
421 | bond->alb_info.primary_is_promisc = 0; | |
1da177e4 LT |
422 | } |
423 | ||
424 | bond->alb_info.rlb_promisc_timeout_counter = 0; | |
425 | ||
426 | alb_send_learning_packets(bond->curr_active_slave, addr); | |
427 | } | |
428 | ||
429 | /* slave being removed should not be active at this point | |
430 | * | |
431 | * Caller must hold bond lock for read | |
432 | */ | |
433 | static void rlb_clear_slave(struct bonding *bond, struct slave *slave) | |
434 | { | |
435 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
436 | struct rlb_client_info *rx_hash_table; | |
437 | u32 index, next_index; | |
438 | ||
439 | /* clear slave from rx_hashtbl */ | |
f515e6b7 | 440 | _lock_rx_hashtbl_bh(bond); |
1da177e4 LT |
441 | |
442 | rx_hash_table = bond_info->rx_hashtbl; | |
443 | index = bond_info->rx_hashtbl_head; | |
444 | for (; index != RLB_NULL_INDEX; index = next_index) { | |
445 | next_index = rx_hash_table[index].next; | |
446 | if (rx_hash_table[index].slave == slave) { | |
447 | struct slave *assigned_slave = rlb_next_rx_slave(bond); | |
448 | ||
449 | if (assigned_slave) { | |
450 | rx_hash_table[index].slave = assigned_slave; | |
885a136c ED |
451 | if (compare_ether_addr_64bits(rx_hash_table[index].mac_dst, |
452 | mac_bcast)) { | |
1da177e4 LT |
453 | bond_info->rx_hashtbl[index].ntt = 1; |
454 | bond_info->rx_ntt = 1; | |
455 | /* A slave has been removed from the | |
456 | * table because it is either disabled | |
457 | * or being released. We must retry the | |
458 | * update to avoid clients from not | |
459 | * being updated & disconnecting when | |
460 | * there is stress | |
461 | */ | |
462 | bond_info->rlb_update_retry_counter = | |
463 | RLB_UPDATE_RETRY; | |
464 | } | |
465 | } else { /* there is no active slave */ | |
466 | rx_hash_table[index].slave = NULL; | |
467 | } | |
468 | } | |
469 | } | |
470 | ||
f515e6b7 | 471 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 | 472 | |
6603a6f2 | 473 | write_lock_bh(&bond->curr_slave_lock); |
1da177e4 LT |
474 | |
475 | if (slave != bond->curr_active_slave) { | |
476 | rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr); | |
477 | } | |
478 | ||
6603a6f2 | 479 | write_unlock_bh(&bond->curr_slave_lock); |
1da177e4 LT |
480 | } |
481 | ||
482 | static void rlb_update_client(struct rlb_client_info *client_info) | |
483 | { | |
484 | int i; | |
485 | ||
486 | if (!client_info->slave) { | |
487 | return; | |
488 | } | |
489 | ||
490 | for (i = 0; i < RLB_ARP_BURST_SIZE; i++) { | |
491 | struct sk_buff *skb; | |
492 | ||
493 | skb = arp_create(ARPOP_REPLY, ETH_P_ARP, | |
494 | client_info->ip_dst, | |
495 | client_info->slave->dev, | |
496 | client_info->ip_src, | |
497 | client_info->mac_dst, | |
498 | client_info->slave->dev->dev_addr, | |
499 | client_info->mac_dst); | |
500 | if (!skb) { | |
a4aee5c8 | 501 | pr_err("%s: Error: failed to create an ARP packet\n", |
4e0952c7 | 502 | client_info->slave->dev->master->name); |
1da177e4 LT |
503 | continue; |
504 | } | |
505 | ||
506 | skb->dev = client_info->slave->dev; | |
507 | ||
508 | if (client_info->tag) { | |
509 | skb = vlan_put_tag(skb, client_info->vlan_id); | |
510 | if (!skb) { | |
a4aee5c8 | 511 | pr_err("%s: Error: failed to insert VLAN tag\n", |
4e0952c7 | 512 | client_info->slave->dev->master->name); |
1da177e4 LT |
513 | continue; |
514 | } | |
515 | } | |
516 | ||
517 | arp_xmit(skb); | |
518 | } | |
519 | } | |
520 | ||
521 | /* sends ARP REPLIES that update the clients that need updating */ | |
522 | static void rlb_update_rx_clients(struct bonding *bond) | |
523 | { | |
524 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
525 | struct rlb_client_info *client_info; | |
526 | u32 hash_index; | |
527 | ||
f515e6b7 | 528 | _lock_rx_hashtbl_bh(bond); |
1da177e4 LT |
529 | |
530 | hash_index = bond_info->rx_hashtbl_head; | |
531 | for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) { | |
532 | client_info = &(bond_info->rx_hashtbl[hash_index]); | |
533 | if (client_info->ntt) { | |
534 | rlb_update_client(client_info); | |
535 | if (bond_info->rlb_update_retry_counter == 0) { | |
536 | client_info->ntt = 0; | |
537 | } | |
538 | } | |
539 | } | |
540 | ||
94e2bd68 | 541 | /* do not update the entries again until this counter is zero so that |
1da177e4 LT |
542 | * not to confuse the clients. |
543 | */ | |
544 | bond_info->rlb_update_delay_counter = RLB_UPDATE_DELAY; | |
545 | ||
f515e6b7 | 546 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 LT |
547 | } |
548 | ||
549 | /* The slave was assigned a new mac address - update the clients */ | |
550 | static void rlb_req_update_slave_clients(struct bonding *bond, struct slave *slave) | |
551 | { | |
552 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
553 | struct rlb_client_info *client_info; | |
554 | int ntt = 0; | |
555 | u32 hash_index; | |
556 | ||
f515e6b7 | 557 | _lock_rx_hashtbl_bh(bond); |
1da177e4 LT |
558 | |
559 | hash_index = bond_info->rx_hashtbl_head; | |
560 | for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) { | |
561 | client_info = &(bond_info->rx_hashtbl[hash_index]); | |
562 | ||
563 | if ((client_info->slave == slave) && | |
885a136c | 564 | compare_ether_addr_64bits(client_info->mac_dst, mac_bcast)) { |
1da177e4 LT |
565 | client_info->ntt = 1; |
566 | ntt = 1; | |
567 | } | |
568 | } | |
569 | ||
570 | // update the team's flag only after the whole iteration | |
571 | if (ntt) { | |
572 | bond_info->rx_ntt = 1; | |
573 | //fasten the change | |
574 | bond_info->rlb_update_retry_counter = RLB_UPDATE_RETRY; | |
575 | } | |
576 | ||
f515e6b7 | 577 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 LT |
578 | } |
579 | ||
580 | /* mark all clients using src_ip to be updated */ | |
d3bb52b0 | 581 | static void rlb_req_update_subnet_clients(struct bonding *bond, __be32 src_ip) |
1da177e4 LT |
582 | { |
583 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
584 | struct rlb_client_info *client_info; | |
585 | u32 hash_index; | |
586 | ||
587 | _lock_rx_hashtbl(bond); | |
588 | ||
589 | hash_index = bond_info->rx_hashtbl_head; | |
590 | for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) { | |
591 | client_info = &(bond_info->rx_hashtbl[hash_index]); | |
592 | ||
593 | if (!client_info->slave) { | |
a4aee5c8 | 594 | pr_err("%s: Error: found a client with no channel in the client's hash table\n", |
4e0952c7 | 595 | bond->dev->name); |
1da177e4 LT |
596 | continue; |
597 | } | |
598 | /*update all clients using this src_ip, that are not assigned | |
599 | * to the team's address (curr_active_slave) and have a known | |
600 | * unicast mac address. | |
601 | */ | |
602 | if ((client_info->ip_src == src_ip) && | |
885a136c ED |
603 | compare_ether_addr_64bits(client_info->slave->dev->dev_addr, |
604 | bond->dev->dev_addr) && | |
605 | compare_ether_addr_64bits(client_info->mac_dst, mac_bcast)) { | |
1da177e4 LT |
606 | client_info->ntt = 1; |
607 | bond_info->rx_ntt = 1; | |
608 | } | |
609 | } | |
610 | ||
611 | _unlock_rx_hashtbl(bond); | |
612 | } | |
613 | ||
614 | /* Caller must hold both bond and ptr locks for read */ | |
615 | static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bond) | |
616 | { | |
617 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
a16aeb36 | 618 | struct arp_pkt *arp = arp_pkt(skb); |
1da177e4 LT |
619 | struct slave *assigned_slave; |
620 | struct rlb_client_info *client_info; | |
621 | u32 hash_index = 0; | |
622 | ||
623 | _lock_rx_hashtbl(bond); | |
624 | ||
e364a341 | 625 | hash_index = _simple_hash((u8 *)&arp->ip_dst, sizeof(arp->ip_dst)); |
1da177e4 LT |
626 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
627 | ||
628 | if (client_info->assigned) { | |
629 | if ((client_info->ip_src == arp->ip_src) && | |
630 | (client_info->ip_dst == arp->ip_dst)) { | |
631 | /* the entry is already assigned to this client */ | |
885a136c | 632 | if (compare_ether_addr_64bits(arp->mac_dst, mac_bcast)) { |
1da177e4 LT |
633 | /* update mac address from arp */ |
634 | memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN); | |
635 | } | |
636 | ||
637 | assigned_slave = client_info->slave; | |
638 | if (assigned_slave) { | |
639 | _unlock_rx_hashtbl(bond); | |
640 | return assigned_slave; | |
641 | } | |
642 | } else { | |
643 | /* the entry is already assigned to some other client, | |
644 | * move the old client to primary (curr_active_slave) so | |
645 | * that the new client can be assigned to this entry. | |
646 | */ | |
647 | if (bond->curr_active_slave && | |
648 | client_info->slave != bond->curr_active_slave) { | |
649 | client_info->slave = bond->curr_active_slave; | |
650 | rlb_update_client(client_info); | |
651 | } | |
652 | } | |
653 | } | |
654 | /* assign a new slave */ | |
655 | assigned_slave = rlb_next_rx_slave(bond); | |
656 | ||
657 | if (assigned_slave) { | |
658 | client_info->ip_src = arp->ip_src; | |
659 | client_info->ip_dst = arp->ip_dst; | |
660 | /* arp->mac_dst is broadcast for arp reqeusts. | |
661 | * will be updated with clients actual unicast mac address | |
662 | * upon receiving an arp reply. | |
663 | */ | |
664 | memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN); | |
665 | client_info->slave = assigned_slave; | |
666 | ||
885a136c | 667 | if (compare_ether_addr_64bits(client_info->mac_dst, mac_bcast)) { |
1da177e4 LT |
668 | client_info->ntt = 1; |
669 | bond->alb_info.rx_ntt = 1; | |
670 | } else { | |
671 | client_info->ntt = 0; | |
672 | } | |
673 | ||
cc0e4070 | 674 | if (bond_vlan_used(bond)) { |
966bc6f4 | 675 | if (!vlan_get_tag(skb, &client_info->vlan_id)) |
1da177e4 | 676 | client_info->tag = 1; |
1da177e4 LT |
677 | } |
678 | ||
679 | if (!client_info->assigned) { | |
680 | u32 prev_tbl_head = bond_info->rx_hashtbl_head; | |
681 | bond_info->rx_hashtbl_head = hash_index; | |
682 | client_info->next = prev_tbl_head; | |
683 | if (prev_tbl_head != RLB_NULL_INDEX) { | |
684 | bond_info->rx_hashtbl[prev_tbl_head].prev = | |
685 | hash_index; | |
686 | } | |
687 | client_info->assigned = 1; | |
688 | } | |
689 | } | |
690 | ||
691 | _unlock_rx_hashtbl(bond); | |
692 | ||
693 | return assigned_slave; | |
694 | } | |
695 | ||
696 | /* chooses (and returns) transmit channel for arp reply | |
697 | * does not choose channel for other arp types since they are | |
698 | * sent on the curr_active_slave | |
699 | */ | |
700 | static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond) | |
701 | { | |
a16aeb36 | 702 | struct arp_pkt *arp = arp_pkt(skb); |
1da177e4 LT |
703 | struct slave *tx_slave = NULL; |
704 | ||
f14c4e4e | 705 | if (arp->op_code == htons(ARPOP_REPLY)) { |
1da177e4 LT |
706 | /* the arp must be sent on the selected |
707 | * rx channel | |
708 | */ | |
709 | tx_slave = rlb_choose_channel(skb, bond); | |
710 | if (tx_slave) { | |
711 | memcpy(arp->mac_src,tx_slave->dev->dev_addr, ETH_ALEN); | |
712 | } | |
5a03cdb7 | 713 | pr_debug("Server sent ARP Reply packet\n"); |
f14c4e4e | 714 | } else if (arp->op_code == htons(ARPOP_REQUEST)) { |
1da177e4 LT |
715 | /* Create an entry in the rx_hashtbl for this client as a |
716 | * place holder. | |
717 | * When the arp reply is received the entry will be updated | |
718 | * with the correct unicast address of the client. | |
719 | */ | |
720 | rlb_choose_channel(skb, bond); | |
721 | ||
77c8e2c0 | 722 | /* The ARP reply packets must be delayed so that |
1da177e4 LT |
723 | * they can cancel out the influence of the ARP request. |
724 | */ | |
725 | bond->alb_info.rlb_update_delay_counter = RLB_UPDATE_DELAY; | |
726 | ||
727 | /* arp requests are broadcast and are sent on the primary | |
728 | * the arp request will collapse all clients on the subnet to | |
729 | * the primary slave. We must register these clients to be | |
730 | * updated with their assigned mac. | |
731 | */ | |
732 | rlb_req_update_subnet_clients(bond, arp->ip_src); | |
5a03cdb7 | 733 | pr_debug("Server sent ARP Request packet\n"); |
1da177e4 LT |
734 | } |
735 | ||
736 | return tx_slave; | |
737 | } | |
738 | ||
739 | /* Caller must hold bond lock for read */ | |
740 | static void rlb_rebalance(struct bonding *bond) | |
741 | { | |
742 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
743 | struct slave *assigned_slave; | |
744 | struct rlb_client_info *client_info; | |
745 | int ntt; | |
746 | u32 hash_index; | |
747 | ||
f515e6b7 | 748 | _lock_rx_hashtbl_bh(bond); |
1da177e4 LT |
749 | |
750 | ntt = 0; | |
751 | hash_index = bond_info->rx_hashtbl_head; | |
752 | for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) { | |
753 | client_info = &(bond_info->rx_hashtbl[hash_index]); | |
754 | assigned_slave = rlb_next_rx_slave(bond); | |
755 | if (assigned_slave && (client_info->slave != assigned_slave)) { | |
756 | client_info->slave = assigned_slave; | |
757 | client_info->ntt = 1; | |
758 | ntt = 1; | |
759 | } | |
760 | } | |
761 | ||
762 | /* update the team's flag only after the whole iteration */ | |
763 | if (ntt) { | |
764 | bond_info->rx_ntt = 1; | |
765 | } | |
f515e6b7 | 766 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 LT |
767 | } |
768 | ||
769 | /* Caller must hold rx_hashtbl lock */ | |
770 | static void rlb_init_table_entry(struct rlb_client_info *entry) | |
771 | { | |
772 | memset(entry, 0, sizeof(struct rlb_client_info)); | |
773 | entry->next = RLB_NULL_INDEX; | |
774 | entry->prev = RLB_NULL_INDEX; | |
775 | } | |
776 | ||
777 | static int rlb_initialize(struct bonding *bond) | |
778 | { | |
779 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
0d206a3a | 780 | struct rlb_client_info *new_hashtbl; |
1da177e4 LT |
781 | int size = RLB_HASH_TABLE_SIZE * sizeof(struct rlb_client_info); |
782 | int i; | |
783 | ||
0d206a3a | 784 | new_hashtbl = kmalloc(size, GFP_KERNEL); |
e404decb | 785 | if (!new_hashtbl) |
1da177e4 | 786 | return -1; |
e404decb | 787 | |
f515e6b7 | 788 | _lock_rx_hashtbl_bh(bond); |
0d206a3a MW |
789 | |
790 | bond_info->rx_hashtbl = new_hashtbl; | |
1da177e4 LT |
791 | |
792 | bond_info->rx_hashtbl_head = RLB_NULL_INDEX; | |
793 | ||
794 | for (i = 0; i < RLB_HASH_TABLE_SIZE; i++) { | |
795 | rlb_init_table_entry(bond_info->rx_hashtbl + i); | |
796 | } | |
797 | ||
f515e6b7 | 798 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 | 799 | |
1da177e4 | 800 | /* register to receive ARPs */ |
3aba891d | 801 | bond->recv_probe = rlb_arp_recv; |
1da177e4 LT |
802 | |
803 | return 0; | |
804 | } | |
805 | ||
806 | static void rlb_deinitialize(struct bonding *bond) | |
807 | { | |
808 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
809 | ||
f515e6b7 | 810 | _lock_rx_hashtbl_bh(bond); |
1da177e4 LT |
811 | |
812 | kfree(bond_info->rx_hashtbl); | |
813 | bond_info->rx_hashtbl = NULL; | |
814 | bond_info->rx_hashtbl_head = RLB_NULL_INDEX; | |
815 | ||
f515e6b7 | 816 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 LT |
817 | } |
818 | ||
819 | static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id) | |
820 | { | |
821 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
822 | u32 curr_index; | |
823 | ||
f515e6b7 | 824 | _lock_rx_hashtbl_bh(bond); |
1da177e4 LT |
825 | |
826 | curr_index = bond_info->rx_hashtbl_head; | |
827 | while (curr_index != RLB_NULL_INDEX) { | |
828 | struct rlb_client_info *curr = &(bond_info->rx_hashtbl[curr_index]); | |
829 | u32 next_index = bond_info->rx_hashtbl[curr_index].next; | |
830 | u32 prev_index = bond_info->rx_hashtbl[curr_index].prev; | |
831 | ||
832 | if (curr->tag && (curr->vlan_id == vlan_id)) { | |
833 | if (curr_index == bond_info->rx_hashtbl_head) { | |
834 | bond_info->rx_hashtbl_head = next_index; | |
835 | } | |
836 | if (prev_index != RLB_NULL_INDEX) { | |
837 | bond_info->rx_hashtbl[prev_index].next = next_index; | |
838 | } | |
839 | if (next_index != RLB_NULL_INDEX) { | |
840 | bond_info->rx_hashtbl[next_index].prev = prev_index; | |
841 | } | |
842 | ||
843 | rlb_init_table_entry(curr); | |
844 | } | |
845 | ||
846 | curr_index = next_index; | |
847 | } | |
848 | ||
f515e6b7 | 849 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 LT |
850 | } |
851 | ||
852 | /*********************** tlb/rlb shared functions *********************/ | |
853 | ||
854 | static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[]) | |
855 | { | |
856 | struct bonding *bond = bond_get_bond_by_slave(slave); | |
857 | struct learning_pkt pkt; | |
858 | int size = sizeof(struct learning_pkt); | |
859 | int i; | |
860 | ||
861 | memset(&pkt, 0, size); | |
862 | memcpy(pkt.mac_dst, mac_addr, ETH_ALEN); | |
863 | memcpy(pkt.mac_src, mac_addr, ETH_ALEN); | |
09640e63 | 864 | pkt.type = cpu_to_be16(ETH_P_LOOP); |
1da177e4 LT |
865 | |
866 | for (i = 0; i < MAX_LP_BURST; i++) { | |
867 | struct sk_buff *skb; | |
868 | char *data; | |
869 | ||
870 | skb = dev_alloc_skb(size); | |
871 | if (!skb) { | |
872 | return; | |
873 | } | |
874 | ||
875 | data = skb_put(skb, size); | |
876 | memcpy(data, &pkt, size); | |
877 | ||
459a98ed | 878 | skb_reset_mac_header(skb); |
b0e380b1 | 879 | skb->network_header = skb->mac_header + ETH_HLEN; |
1da177e4 LT |
880 | skb->protocol = pkt.type; |
881 | skb->priority = TC_PRIO_CONTROL; | |
882 | skb->dev = slave->dev; | |
883 | ||
cc0e4070 | 884 | if (bond_vlan_used(bond)) { |
1da177e4 LT |
885 | struct vlan_entry *vlan; |
886 | ||
887 | vlan = bond_next_vlan(bond, | |
888 | bond->alb_info.current_alb_vlan); | |
889 | ||
890 | bond->alb_info.current_alb_vlan = vlan; | |
891 | if (!vlan) { | |
892 | kfree_skb(skb); | |
893 | continue; | |
894 | } | |
895 | ||
896 | skb = vlan_put_tag(skb, vlan->vlan_id); | |
897 | if (!skb) { | |
a4aee5c8 | 898 | pr_err("%s: Error: failed to insert VLAN tag\n", |
4e0952c7 | 899 | bond->dev->name); |
1da177e4 LT |
900 | continue; |
901 | } | |
902 | } | |
903 | ||
904 | dev_queue_xmit(skb); | |
905 | } | |
906 | } | |
907 | ||
b924551b | 908 | static int alb_set_slave_mac_addr(struct slave *slave, u8 addr[]) |
1da177e4 LT |
909 | { |
910 | struct net_device *dev = slave->dev; | |
911 | struct sockaddr s_addr; | |
912 | ||
b924551b | 913 | if (slave->bond->params.mode == BOND_MODE_TLB) { |
1da177e4 LT |
914 | memcpy(dev->dev_addr, addr, dev->addr_len); |
915 | return 0; | |
916 | } | |
917 | ||
918 | /* for rlb each slave must have a unique hw mac addresses so that */ | |
919 | /* each slave will receive packets destined to a different mac */ | |
920 | memcpy(s_addr.sa_data, addr, dev->addr_len); | |
921 | s_addr.sa_family = dev->type; | |
922 | if (dev_set_mac_address(dev, &s_addr)) { | |
a4aee5c8 JP |
923 | pr_err("%s: Error: dev_set_mac_address of dev %s failed!\n" |
924 | "ALB mode requires that the base driver support setting the hw address also when the network device's interface is open\n", | |
4e0952c7 | 925 | dev->master->name, dev->name); |
1da177e4 LT |
926 | return -EOPNOTSUPP; |
927 | } | |
928 | return 0; | |
929 | } | |
930 | ||
059fe7a5 JV |
931 | /* |
932 | * Swap MAC addresses between two slaves. | |
933 | * | |
934 | * Called with RTNL held, and no other locks. | |
935 | * | |
936 | */ | |
937 | ||
1da177e4 LT |
938 | static void alb_swap_mac_addr(struct bonding *bond, struct slave *slave1, struct slave *slave2) |
939 | { | |
1da177e4 | 940 | u8 tmp_mac_addr[ETH_ALEN]; |
1da177e4 LT |
941 | |
942 | memcpy(tmp_mac_addr, slave1->dev->dev_addr, ETH_ALEN); | |
b924551b JB |
943 | alb_set_slave_mac_addr(slave1, slave2->dev->dev_addr); |
944 | alb_set_slave_mac_addr(slave2, tmp_mac_addr); | |
1da177e4 | 945 | |
059fe7a5 JV |
946 | } |
947 | ||
948 | /* | |
949 | * Send learning packets after MAC address swap. | |
950 | * | |
2543331d | 951 | * Called with RTNL and no other locks |
059fe7a5 JV |
952 | */ |
953 | static void alb_fasten_mac_swap(struct bonding *bond, struct slave *slave1, | |
954 | struct slave *slave2) | |
955 | { | |
956 | int slaves_state_differ = (SLAVE_IS_OK(slave1) != SLAVE_IS_OK(slave2)); | |
957 | struct slave *disabled_slave = NULL; | |
958 | ||
2543331d JV |
959 | ASSERT_RTNL(); |
960 | ||
1da177e4 LT |
961 | /* fasten the change in the switch */ |
962 | if (SLAVE_IS_OK(slave1)) { | |
963 | alb_send_learning_packets(slave1, slave1->dev->dev_addr); | |
964 | if (bond->alb_info.rlb_enabled) { | |
965 | /* inform the clients that the mac address | |
966 | * has changed | |
967 | */ | |
968 | rlb_req_update_slave_clients(bond, slave1); | |
969 | } | |
970 | } else { | |
971 | disabled_slave = slave1; | |
972 | } | |
973 | ||
974 | if (SLAVE_IS_OK(slave2)) { | |
975 | alb_send_learning_packets(slave2, slave2->dev->dev_addr); | |
976 | if (bond->alb_info.rlb_enabled) { | |
977 | /* inform the clients that the mac address | |
978 | * has changed | |
979 | */ | |
980 | rlb_req_update_slave_clients(bond, slave2); | |
981 | } | |
982 | } else { | |
983 | disabled_slave = slave2; | |
984 | } | |
985 | ||
986 | if (bond->alb_info.rlb_enabled && slaves_state_differ) { | |
987 | /* A disabled slave was assigned an active mac addr */ | |
988 | rlb_teach_disabled_mac_on_primary(bond, | |
989 | disabled_slave->dev->dev_addr); | |
990 | } | |
991 | } | |
992 | ||
993 | /** | |
994 | * alb_change_hw_addr_on_detach | |
995 | * @bond: bonding we're working on | |
996 | * @slave: the slave that was just detached | |
997 | * | |
998 | * We assume that @slave was already detached from the slave list. | |
999 | * | |
1000 | * If @slave's permanent hw address is different both from its current | |
1001 | * address and from @bond's address, then somewhere in the bond there's | |
1002 | * a slave that has @slave's permanet address as its current address. | |
1003 | * We'll make sure that that slave no longer uses @slave's permanent address. | |
1004 | * | |
2543331d | 1005 | * Caller must hold RTNL and no other locks |
1da177e4 LT |
1006 | */ |
1007 | static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *slave) | |
1008 | { | |
1009 | int perm_curr_diff; | |
1010 | int perm_bond_diff; | |
1011 | ||
885a136c ED |
1012 | perm_curr_diff = compare_ether_addr_64bits(slave->perm_hwaddr, |
1013 | slave->dev->dev_addr); | |
1014 | perm_bond_diff = compare_ether_addr_64bits(slave->perm_hwaddr, | |
1015 | bond->dev->dev_addr); | |
1da177e4 LT |
1016 | |
1017 | if (perm_curr_diff && perm_bond_diff) { | |
1018 | struct slave *tmp_slave; | |
1019 | int i, found = 0; | |
1020 | ||
1021 | bond_for_each_slave(bond, tmp_slave, i) { | |
885a136c ED |
1022 | if (!compare_ether_addr_64bits(slave->perm_hwaddr, |
1023 | tmp_slave->dev->dev_addr)) { | |
1da177e4 LT |
1024 | found = 1; |
1025 | break; | |
1026 | } | |
1027 | } | |
1028 | ||
1029 | if (found) { | |
059fe7a5 | 1030 | /* locking: needs RTNL and nothing else */ |
1da177e4 | 1031 | alb_swap_mac_addr(bond, slave, tmp_slave); |
059fe7a5 | 1032 | alb_fasten_mac_swap(bond, slave, tmp_slave); |
1da177e4 LT |
1033 | } |
1034 | } | |
1035 | } | |
1036 | ||
1037 | /** | |
1038 | * alb_handle_addr_collision_on_attach | |
1039 | * @bond: bonding we're working on | |
1040 | * @slave: the slave that was just attached | |
1041 | * | |
1042 | * checks uniqueness of slave's mac address and handles the case the | |
1043 | * new slave uses the bonds mac address. | |
1044 | * | |
1045 | * If the permanent hw address of @slave is @bond's hw address, we need to | |
1046 | * find a different hw address to give @slave, that isn't in use by any other | |
77c8e2c0 | 1047 | * slave in the bond. This address must be, of course, one of the permanent |
1da177e4 LT |
1048 | * addresses of the other slaves. |
1049 | * | |
1050 | * We go over the slave list, and for each slave there we compare its | |
1051 | * permanent hw address with the current address of all the other slaves. | |
1052 | * If no match was found, then we've found a slave with a permanent address | |
1053 | * that isn't used by any other slave in the bond, so we can assign it to | |
1054 | * @slave. | |
1055 | * | |
1056 | * assumption: this function is called before @slave is attached to the | |
1057 | * bond slave list. | |
1058 | * | |
1059 | * caller must hold the bond lock for write since the mac addresses are compared | |
1060 | * and may be swapped. | |
1061 | */ | |
1062 | static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slave *slave) | |
1063 | { | |
1064 | struct slave *tmp_slave1, *tmp_slave2, *free_mac_slave; | |
1065 | struct slave *has_bond_addr = bond->curr_active_slave; | |
1066 | int i, j, found = 0; | |
1067 | ||
1068 | if (bond->slave_cnt == 0) { | |
1069 | /* this is the first slave */ | |
1070 | return 0; | |
1071 | } | |
1072 | ||
1073 | /* if slave's mac address differs from bond's mac address | |
1074 | * check uniqueness of slave's mac address against the other | |
1075 | * slaves in the bond. | |
1076 | */ | |
885a136c | 1077 | if (compare_ether_addr_64bits(slave->perm_hwaddr, bond->dev->dev_addr)) { |
1da177e4 | 1078 | bond_for_each_slave(bond, tmp_slave1, i) { |
885a136c ED |
1079 | if (!compare_ether_addr_64bits(tmp_slave1->dev->dev_addr, |
1080 | slave->dev->dev_addr)) { | |
1da177e4 LT |
1081 | found = 1; |
1082 | break; | |
1083 | } | |
1084 | } | |
1085 | ||
6b38aefe JL |
1086 | if (!found) |
1087 | return 0; | |
1da177e4 | 1088 | |
6b38aefe JL |
1089 | /* Try setting slave mac to bond address and fall-through |
1090 | to code handling that situation below... */ | |
b924551b | 1091 | alb_set_slave_mac_addr(slave, bond->dev->dev_addr); |
1da177e4 LT |
1092 | } |
1093 | ||
1094 | /* The slave's address is equal to the address of the bond. | |
1095 | * Search for a spare address in the bond for this slave. | |
1096 | */ | |
1097 | free_mac_slave = NULL; | |
1098 | ||
1099 | bond_for_each_slave(bond, tmp_slave1, i) { | |
1100 | found = 0; | |
1101 | bond_for_each_slave(bond, tmp_slave2, j) { | |
885a136c ED |
1102 | if (!compare_ether_addr_64bits(tmp_slave1->perm_hwaddr, |
1103 | tmp_slave2->dev->dev_addr)) { | |
1da177e4 LT |
1104 | found = 1; |
1105 | break; | |
1106 | } | |
1107 | } | |
1108 | ||
1109 | if (!found) { | |
1110 | /* no slave has tmp_slave1's perm addr | |
1111 | * as its curr addr | |
1112 | */ | |
1113 | free_mac_slave = tmp_slave1; | |
1114 | break; | |
1115 | } | |
1116 | ||
1117 | if (!has_bond_addr) { | |
885a136c ED |
1118 | if (!compare_ether_addr_64bits(tmp_slave1->dev->dev_addr, |
1119 | bond->dev->dev_addr)) { | |
1da177e4 LT |
1120 | |
1121 | has_bond_addr = tmp_slave1; | |
1122 | } | |
1123 | } | |
1124 | } | |
1125 | ||
1126 | if (free_mac_slave) { | |
b924551b | 1127 | alb_set_slave_mac_addr(slave, free_mac_slave->perm_hwaddr); |
1da177e4 | 1128 | |
a4aee5c8 | 1129 | pr_warning("%s: Warning: the hw address of slave %s is in use by the bond; giving it the hw address of %s\n", |
e5e2a8fd JP |
1130 | bond->dev->name, slave->dev->name, |
1131 | free_mac_slave->dev->name); | |
1da177e4 LT |
1132 | |
1133 | } else if (has_bond_addr) { | |
a4aee5c8 | 1134 | 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", |
4e0952c7 | 1135 | bond->dev->name, slave->dev->name); |
1da177e4 LT |
1136 | return -EFAULT; |
1137 | } | |
1138 | ||
1139 | return 0; | |
1140 | } | |
1141 | ||
1142 | /** | |
1143 | * alb_set_mac_address | |
1144 | * @bond: | |
1145 | * @addr: | |
1146 | * | |
1147 | * In TLB mode all slaves are configured to the bond's hw address, but set | |
1148 | * their dev_addr field to different addresses (based on their permanent hw | |
1149 | * addresses). | |
1150 | * | |
1151 | * For each slave, this function sets the interface to the new address and then | |
1152 | * changes its dev_addr field to its previous value. | |
1153 | * | |
1154 | * Unwinding assumes bond's mac address has not yet changed. | |
1155 | */ | |
1156 | static int alb_set_mac_address(struct bonding *bond, void *addr) | |
1157 | { | |
1158 | struct sockaddr sa; | |
1159 | struct slave *slave, *stop_at; | |
1160 | char tmp_addr[ETH_ALEN]; | |
1161 | int res; | |
1162 | int i; | |
1163 | ||
1164 | if (bond->alb_info.rlb_enabled) { | |
1165 | return 0; | |
1166 | } | |
1167 | ||
1168 | bond_for_each_slave(bond, slave, i) { | |
1da177e4 LT |
1169 | /* save net_device's current hw address */ |
1170 | memcpy(tmp_addr, slave->dev->dev_addr, ETH_ALEN); | |
1171 | ||
1172 | res = dev_set_mac_address(slave->dev, addr); | |
1173 | ||
1174 | /* restore net_device's hw address */ | |
1175 | memcpy(slave->dev->dev_addr, tmp_addr, ETH_ALEN); | |
1176 | ||
eb7cc59a | 1177 | if (res) |
1da177e4 | 1178 | goto unwind; |
1da177e4 LT |
1179 | } |
1180 | ||
1181 | return 0; | |
1182 | ||
1183 | unwind: | |
1184 | memcpy(sa.sa_data, bond->dev->dev_addr, bond->dev->addr_len); | |
1185 | sa.sa_family = bond->dev->type; | |
1186 | ||
1187 | /* unwind from head to the slave that failed */ | |
1188 | stop_at = slave; | |
1189 | bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) { | |
1190 | memcpy(tmp_addr, slave->dev->dev_addr, ETH_ALEN); | |
1191 | dev_set_mac_address(slave->dev, &sa); | |
1192 | memcpy(slave->dev->dev_addr, tmp_addr, ETH_ALEN); | |
1193 | } | |
1194 | ||
1195 | return res; | |
1196 | } | |
1197 | ||
1198 | /************************ exported alb funcions ************************/ | |
1199 | ||
1200 | int bond_alb_initialize(struct bonding *bond, int rlb_enabled) | |
1201 | { | |
1202 | int res; | |
1203 | ||
1204 | res = tlb_initialize(bond); | |
1205 | if (res) { | |
1206 | return res; | |
1207 | } | |
1208 | ||
1209 | if (rlb_enabled) { | |
1210 | bond->alb_info.rlb_enabled = 1; | |
1211 | /* initialize rlb */ | |
1212 | res = rlb_initialize(bond); | |
1213 | if (res) { | |
1214 | tlb_deinitialize(bond); | |
1215 | return res; | |
1216 | } | |
b76850ab MW |
1217 | } else { |
1218 | bond->alb_info.rlb_enabled = 0; | |
1da177e4 LT |
1219 | } |
1220 | ||
1221 | return 0; | |
1222 | } | |
1223 | ||
1224 | void bond_alb_deinitialize(struct bonding *bond) | |
1225 | { | |
1226 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1227 | ||
1228 | tlb_deinitialize(bond); | |
1229 | ||
1230 | if (bond_info->rlb_enabled) { | |
1231 | rlb_deinitialize(bond); | |
1232 | } | |
1233 | } | |
1234 | ||
1235 | int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev) | |
1236 | { | |
454d7c9b | 1237 | struct bonding *bond = netdev_priv(bond_dev); |
1da177e4 LT |
1238 | struct ethhdr *eth_data; |
1239 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1240 | struct slave *tx_slave = NULL; | |
d3bb52b0 | 1241 | static const __be32 ip_bcast = htonl(0xffffffff); |
1da177e4 LT |
1242 | int hash_size = 0; |
1243 | int do_tx_balance = 1; | |
1244 | u32 hash_index = 0; | |
eddc9ec5 | 1245 | const u8 *hash_start = NULL; |
1da177e4 | 1246 | int res = 1; |
2d1ea19d | 1247 | struct ipv6hdr *ip6hdr; |
1da177e4 | 1248 | |
459a98ed | 1249 | skb_reset_mac_header(skb); |
1da177e4 LT |
1250 | eth_data = eth_hdr(skb); |
1251 | ||
0693e88e | 1252 | /* make sure that the curr_active_slave do not change during tx |
1da177e4 | 1253 | */ |
1da177e4 LT |
1254 | read_lock(&bond->curr_slave_lock); |
1255 | ||
1da177e4 | 1256 | switch (ntohs(skb->protocol)) { |
eddc9ec5 ACM |
1257 | case ETH_P_IP: { |
1258 | const struct iphdr *iph = ip_hdr(skb); | |
1259 | ||
885a136c | 1260 | if (!compare_ether_addr_64bits(eth_data->h_dest, mac_bcast) || |
eddc9ec5 ACM |
1261 | (iph->daddr == ip_bcast) || |
1262 | (iph->protocol == IPPROTO_IGMP)) { | |
1da177e4 LT |
1263 | do_tx_balance = 0; |
1264 | break; | |
1265 | } | |
eddc9ec5 ACM |
1266 | hash_start = (char *)&(iph->daddr); |
1267 | hash_size = sizeof(iph->daddr); | |
1268 | } | |
1da177e4 LT |
1269 | break; |
1270 | case ETH_P_IPV6: | |
2d1ea19d VY |
1271 | /* IPv6 doesn't really use broadcast mac address, but leave |
1272 | * that here just in case. | |
1273 | */ | |
885a136c | 1274 | if (!compare_ether_addr_64bits(eth_data->h_dest, mac_bcast)) { |
1da177e4 LT |
1275 | do_tx_balance = 0; |
1276 | break; | |
2d1ea19d VY |
1277 | } |
1278 | ||
1279 | /* IPv6 uses all-nodes multicast as an equivalent to | |
1280 | * broadcasts in IPv4. | |
1281 | */ | |
885a136c | 1282 | if (!compare_ether_addr_64bits(eth_data->h_dest, mac_v6_allmcast)) { |
2d1ea19d VY |
1283 | do_tx_balance = 0; |
1284 | break; | |
1285 | } | |
1286 | ||
1287 | /* Additianally, DAD probes should not be tx-balanced as that | |
1288 | * will lead to false positives for duplicate addresses and | |
1289 | * prevent address configuration from working. | |
1290 | */ | |
1291 | ip6hdr = ipv6_hdr(skb); | |
1292 | if (ipv6_addr_any(&ip6hdr->saddr)) { | |
1293 | do_tx_balance = 0; | |
1294 | break; | |
1da177e4 LT |
1295 | } |
1296 | ||
0660e03f ACM |
1297 | hash_start = (char *)&(ipv6_hdr(skb)->daddr); |
1298 | hash_size = sizeof(ipv6_hdr(skb)->daddr); | |
1da177e4 LT |
1299 | break; |
1300 | case ETH_P_IPX: | |
d3bb52b0 | 1301 | if (ipx_hdr(skb)->ipx_checksum != IPX_NO_CHECKSUM) { |
1da177e4 LT |
1302 | /* something is wrong with this packet */ |
1303 | do_tx_balance = 0; | |
1304 | break; | |
1305 | } | |
1306 | ||
1307 | if (ipx_hdr(skb)->ipx_type != IPX_TYPE_NCP) { | |
1308 | /* The only protocol worth balancing in | |
1309 | * this family since it has an "ARP" like | |
1310 | * mechanism | |
1311 | */ | |
1312 | do_tx_balance = 0; | |
1313 | break; | |
1314 | } | |
1315 | ||
1316 | hash_start = (char*)eth_data->h_dest; | |
1317 | hash_size = ETH_ALEN; | |
1318 | break; | |
1319 | case ETH_P_ARP: | |
1320 | do_tx_balance = 0; | |
1321 | if (bond_info->rlb_enabled) { | |
1322 | tx_slave = rlb_arp_xmit(skb, bond); | |
1323 | } | |
1324 | break; | |
1325 | default: | |
1326 | do_tx_balance = 0; | |
1327 | break; | |
1328 | } | |
1329 | ||
1330 | if (do_tx_balance) { | |
1331 | hash_index = _simple_hash(hash_start, hash_size); | |
1332 | tx_slave = tlb_choose_channel(bond, hash_index, skb->len); | |
1333 | } | |
1334 | ||
1335 | if (!tx_slave) { | |
1336 | /* unbalanced or unassigned, send through primary */ | |
1337 | tx_slave = bond->curr_active_slave; | |
1338 | bond_info->unbalanced_load += skb->len; | |
1339 | } | |
1340 | ||
1341 | if (tx_slave && SLAVE_IS_OK(tx_slave)) { | |
1342 | if (tx_slave != bond->curr_active_slave) { | |
1343 | memcpy(eth_data->h_source, | |
1344 | tx_slave->dev->dev_addr, | |
1345 | ETH_ALEN); | |
1346 | } | |
1347 | ||
1348 | res = bond_dev_queue_xmit(bond, skb, tx_slave->dev); | |
1349 | } else { | |
1350 | if (tx_slave) { | |
f515e6b7 MU |
1351 | _lock_tx_hashtbl(bond); |
1352 | __tlb_clear_slave(bond, tx_slave, 0); | |
1353 | _unlock_tx_hashtbl(bond); | |
1da177e4 LT |
1354 | } |
1355 | } | |
1356 | ||
1da177e4 LT |
1357 | if (res) { |
1358 | /* no suitable interface, frame not sent */ | |
1359 | dev_kfree_skb(skb); | |
1360 | } | |
1361 | read_unlock(&bond->curr_slave_lock); | |
0693e88e | 1362 | |
ec634fe3 | 1363 | return NETDEV_TX_OK; |
1da177e4 LT |
1364 | } |
1365 | ||
1b76b316 | 1366 | void bond_alb_monitor(struct work_struct *work) |
1da177e4 | 1367 | { |
1b76b316 JV |
1368 | struct bonding *bond = container_of(work, struct bonding, |
1369 | alb_work.work); | |
1da177e4 LT |
1370 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
1371 | struct slave *slave; | |
1372 | int i; | |
1373 | ||
1374 | read_lock(&bond->lock); | |
1375 | ||
1da177e4 LT |
1376 | if (bond->slave_cnt == 0) { |
1377 | bond_info->tx_rebalance_counter = 0; | |
1378 | bond_info->lp_counter = 0; | |
1379 | goto re_arm; | |
1380 | } | |
1381 | ||
1382 | bond_info->tx_rebalance_counter++; | |
1383 | bond_info->lp_counter++; | |
1384 | ||
1385 | /* send learning packets */ | |
1386 | if (bond_info->lp_counter >= BOND_ALB_LP_TICKS) { | |
1387 | /* change of curr_active_slave involves swapping of mac addresses. | |
1388 | * in order to avoid this swapping from happening while | |
1389 | * sending the learning packets, the curr_slave_lock must be held for | |
1390 | * read. | |
1391 | */ | |
1392 | read_lock(&bond->curr_slave_lock); | |
1393 | ||
1394 | bond_for_each_slave(bond, slave, i) { | |
e944ef79 | 1395 | alb_send_learning_packets(slave, slave->dev->dev_addr); |
1da177e4 LT |
1396 | } |
1397 | ||
1398 | read_unlock(&bond->curr_slave_lock); | |
1399 | ||
1400 | bond_info->lp_counter = 0; | |
1401 | } | |
1402 | ||
1403 | /* rebalance tx traffic */ | |
1404 | if (bond_info->tx_rebalance_counter >= BOND_TLB_REBALANCE_TICKS) { | |
1405 | ||
1406 | read_lock(&bond->curr_slave_lock); | |
1407 | ||
1408 | bond_for_each_slave(bond, slave, i) { | |
1409 | tlb_clear_slave(bond, slave, 1); | |
1410 | if (slave == bond->curr_active_slave) { | |
1411 | SLAVE_TLB_INFO(slave).load = | |
1412 | bond_info->unbalanced_load / | |
1413 | BOND_TLB_REBALANCE_INTERVAL; | |
1414 | bond_info->unbalanced_load = 0; | |
1415 | } | |
1416 | } | |
1417 | ||
1418 | read_unlock(&bond->curr_slave_lock); | |
1419 | ||
1420 | bond_info->tx_rebalance_counter = 0; | |
1421 | } | |
1422 | ||
1423 | /* handle rlb stuff */ | |
1424 | if (bond_info->rlb_enabled) { | |
1da177e4 LT |
1425 | if (bond_info->primary_is_promisc && |
1426 | (++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) { | |
1427 | ||
d0e81b7e JV |
1428 | /* |
1429 | * dev_set_promiscuity requires rtnl and | |
e6d265e8 | 1430 | * nothing else. Avoid race with bond_close. |
d0e81b7e JV |
1431 | */ |
1432 | read_unlock(&bond->lock); | |
e6d265e8 JV |
1433 | if (!rtnl_trylock()) { |
1434 | read_lock(&bond->lock); | |
1435 | goto re_arm; | |
1436 | } | |
d0e81b7e | 1437 | |
1da177e4 LT |
1438 | bond_info->rlb_promisc_timeout_counter = 0; |
1439 | ||
1440 | /* If the primary was set to promiscuous mode | |
1441 | * because a slave was disabled then | |
1442 | * it can now leave promiscuous mode. | |
1443 | */ | |
1444 | dev_set_promiscuity(bond->curr_active_slave->dev, -1); | |
1445 | bond_info->primary_is_promisc = 0; | |
1da177e4 | 1446 | |
d0e81b7e JV |
1447 | rtnl_unlock(); |
1448 | read_lock(&bond->lock); | |
1449 | } | |
1da177e4 LT |
1450 | |
1451 | if (bond_info->rlb_rebalance) { | |
1452 | bond_info->rlb_rebalance = 0; | |
1453 | rlb_rebalance(bond); | |
1454 | } | |
1455 | ||
1456 | /* check if clients need updating */ | |
1457 | if (bond_info->rx_ntt) { | |
1458 | if (bond_info->rlb_update_delay_counter) { | |
1459 | --bond_info->rlb_update_delay_counter; | |
1460 | } else { | |
1461 | rlb_update_rx_clients(bond); | |
1462 | if (bond_info->rlb_update_retry_counter) { | |
1463 | --bond_info->rlb_update_retry_counter; | |
1464 | } else { | |
1465 | bond_info->rx_ntt = 0; | |
1466 | } | |
1467 | } | |
1468 | } | |
1469 | } | |
1470 | ||
1471 | re_arm: | |
e6d265e8 JV |
1472 | queue_delayed_work(bond->wq, &bond->alb_work, alb_delta_in_ticks); |
1473 | ||
1da177e4 LT |
1474 | read_unlock(&bond->lock); |
1475 | } | |
1476 | ||
1477 | /* assumption: called before the slave is attached to the bond | |
1478 | * and not locked by the bond lock | |
1479 | */ | |
1480 | int bond_alb_init_slave(struct bonding *bond, struct slave *slave) | |
1481 | { | |
1482 | int res; | |
1483 | ||
b924551b | 1484 | res = alb_set_slave_mac_addr(slave, slave->perm_hwaddr); |
1da177e4 LT |
1485 | if (res) { |
1486 | return res; | |
1487 | } | |
1488 | ||
1489 | /* caller must hold the bond lock for write since the mac addresses | |
1490 | * are compared and may be swapped. | |
1491 | */ | |
6603a6f2 | 1492 | read_lock(&bond->lock); |
1da177e4 LT |
1493 | |
1494 | res = alb_handle_addr_collision_on_attach(bond, slave); | |
1495 | ||
6603a6f2 | 1496 | read_unlock(&bond->lock); |
1da177e4 LT |
1497 | |
1498 | if (res) { | |
1499 | return res; | |
1500 | } | |
1501 | ||
1502 | tlb_init_slave(slave); | |
1503 | ||
1504 | /* order a rebalance ASAP */ | |
1505 | bond->alb_info.tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS; | |
1506 | ||
1507 | if (bond->alb_info.rlb_enabled) { | |
1508 | bond->alb_info.rlb_rebalance = 1; | |
1509 | } | |
1510 | ||
1511 | return 0; | |
1512 | } | |
1513 | ||
2543331d JV |
1514 | /* |
1515 | * Remove slave from tlb and rlb hash tables, and fix up MAC addresses | |
1516 | * if necessary. | |
1517 | * | |
1518 | * Caller must hold RTNL and no other locks | |
1519 | */ | |
1da177e4 LT |
1520 | void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave) |
1521 | { | |
1522 | if (bond->slave_cnt > 1) { | |
1523 | alb_change_hw_addr_on_detach(bond, slave); | |
1524 | } | |
1525 | ||
1526 | tlb_clear_slave(bond, slave, 0); | |
1527 | ||
1528 | if (bond->alb_info.rlb_enabled) { | |
1529 | bond->alb_info.next_rx_slave = NULL; | |
1530 | rlb_clear_slave(bond, slave); | |
1531 | } | |
1532 | } | |
1533 | ||
1534 | /* Caller must hold bond lock for read */ | |
1535 | void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link) | |
1536 | { | |
1537 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1538 | ||
1539 | if (link == BOND_LINK_DOWN) { | |
1540 | tlb_clear_slave(bond, slave, 0); | |
1541 | if (bond->alb_info.rlb_enabled) { | |
1542 | rlb_clear_slave(bond, slave); | |
1543 | } | |
1544 | } else if (link == BOND_LINK_UP) { | |
1545 | /* order a rebalance ASAP */ | |
1546 | bond_info->tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS; | |
1547 | if (bond->alb_info.rlb_enabled) { | |
1548 | bond->alb_info.rlb_rebalance = 1; | |
1549 | /* If the updelay module parameter is smaller than the | |
1550 | * forwarding delay of the switch the rebalance will | |
1551 | * not work because the rebalance arp replies will | |
1552 | * not be forwarded to the clients.. | |
1553 | */ | |
1554 | } | |
1555 | } | |
1556 | } | |
1557 | ||
1558 | /** | |
1559 | * bond_alb_handle_active_change - assign new curr_active_slave | |
1560 | * @bond: our bonding struct | |
1561 | * @new_slave: new slave to assign | |
1562 | * | |
1563 | * Set the bond->curr_active_slave to @new_slave and handle | |
1564 | * mac address swapping and promiscuity changes as needed. | |
1565 | * | |
059fe7a5 JV |
1566 | * If new_slave is NULL, caller must hold curr_slave_lock or |
1567 | * bond->lock for write. | |
1568 | * | |
1569 | * If new_slave is not NULL, caller must hold RTNL, bond->lock for | |
1570 | * read and curr_slave_lock for write. Processing here may sleep, so | |
1571 | * no other locks may be held. | |
1da177e4 LT |
1572 | */ |
1573 | void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave) | |
1f78d9f9 HE |
1574 | __releases(&bond->curr_slave_lock) |
1575 | __releases(&bond->lock) | |
1576 | __acquires(&bond->lock) | |
1577 | __acquires(&bond->curr_slave_lock) | |
1da177e4 LT |
1578 | { |
1579 | struct slave *swap_slave; | |
1580 | int i; | |
1581 | ||
1582 | if (bond->curr_active_slave == new_slave) { | |
1583 | return; | |
1584 | } | |
1585 | ||
1586 | if (bond->curr_active_slave && bond->alb_info.primary_is_promisc) { | |
1587 | dev_set_promiscuity(bond->curr_active_slave->dev, -1); | |
1588 | bond->alb_info.primary_is_promisc = 0; | |
1589 | bond->alb_info.rlb_promisc_timeout_counter = 0; | |
1590 | } | |
1591 | ||
1592 | swap_slave = bond->curr_active_slave; | |
1593 | bond->curr_active_slave = new_slave; | |
1594 | ||
1595 | if (!new_slave || (bond->slave_cnt == 0)) { | |
1596 | return; | |
1597 | } | |
1598 | ||
1599 | /* set the new curr_active_slave to the bonds mac address | |
1600 | * i.e. swap mac addresses of old curr_active_slave and new curr_active_slave | |
1601 | */ | |
1602 | if (!swap_slave) { | |
1603 | struct slave *tmp_slave; | |
1604 | /* find slave that is holding the bond's mac address */ | |
1605 | bond_for_each_slave(bond, tmp_slave, i) { | |
885a136c ED |
1606 | if (!compare_ether_addr_64bits(tmp_slave->dev->dev_addr, |
1607 | bond->dev->dev_addr)) { | |
1da177e4 LT |
1608 | swap_slave = tmp_slave; |
1609 | break; | |
1610 | } | |
1611 | } | |
1612 | } | |
1613 | ||
059fe7a5 JV |
1614 | /* |
1615 | * Arrange for swap_slave and new_slave to temporarily be | |
1616 | * ignored so we can mess with their MAC addresses without | |
1617 | * fear of interference from transmit activity. | |
1618 | */ | |
1619 | if (swap_slave) { | |
1620 | tlb_clear_slave(bond, swap_slave, 1); | |
1621 | } | |
1622 | tlb_clear_slave(bond, new_slave, 1); | |
1623 | ||
1624 | write_unlock_bh(&bond->curr_slave_lock); | |
1625 | read_unlock(&bond->lock); | |
1626 | ||
e0138a66 JV |
1627 | ASSERT_RTNL(); |
1628 | ||
1da177e4 LT |
1629 | /* curr_active_slave must be set before calling alb_swap_mac_addr */ |
1630 | if (swap_slave) { | |
1631 | /* swap mac address */ | |
1632 | alb_swap_mac_addr(bond, swap_slave, new_slave); | |
1633 | } else { | |
1634 | /* set the new_slave to the bond mac address */ | |
b924551b | 1635 | alb_set_slave_mac_addr(new_slave, bond->dev->dev_addr); |
059fe7a5 JV |
1636 | } |
1637 | ||
059fe7a5 JV |
1638 | if (swap_slave) { |
1639 | alb_fasten_mac_swap(bond, swap_slave, new_slave); | |
2543331d | 1640 | read_lock(&bond->lock); |
059fe7a5 | 1641 | } else { |
2543331d | 1642 | read_lock(&bond->lock); |
1da177e4 LT |
1643 | alb_send_learning_packets(new_slave, bond->dev->dev_addr); |
1644 | } | |
059fe7a5 JV |
1645 | |
1646 | write_lock_bh(&bond->curr_slave_lock); | |
1da177e4 LT |
1647 | } |
1648 | ||
059fe7a5 JV |
1649 | /* |
1650 | * Called with RTNL | |
1651 | */ | |
1da177e4 | 1652 | int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr) |
1f78d9f9 | 1653 | __acquires(&bond->lock) |
815bcc27 | 1654 | __releases(&bond->lock) |
1da177e4 | 1655 | { |
454d7c9b | 1656 | struct bonding *bond = netdev_priv(bond_dev); |
1da177e4 LT |
1657 | struct sockaddr *sa = addr; |
1658 | struct slave *slave, *swap_slave; | |
1659 | int res; | |
1660 | int i; | |
1661 | ||
1662 | if (!is_valid_ether_addr(sa->sa_data)) { | |
1663 | return -EADDRNOTAVAIL; | |
1664 | } | |
1665 | ||
1666 | res = alb_set_mac_address(bond, addr); | |
1667 | if (res) { | |
1668 | return res; | |
1669 | } | |
1670 | ||
1671 | memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len); | |
1672 | ||
1673 | /* If there is no curr_active_slave there is nothing else to do. | |
1674 | * Otherwise we'll need to pass the new address to it and handle | |
1675 | * duplications. | |
1676 | */ | |
1677 | if (!bond->curr_active_slave) { | |
1678 | return 0; | |
1679 | } | |
1680 | ||
1681 | swap_slave = NULL; | |
1682 | ||
1683 | bond_for_each_slave(bond, slave, i) { | |
885a136c ED |
1684 | if (!compare_ether_addr_64bits(slave->dev->dev_addr, |
1685 | bond_dev->dev_addr)) { | |
1da177e4 LT |
1686 | swap_slave = slave; |
1687 | break; | |
1688 | } | |
1689 | } | |
1690 | ||
1691 | if (swap_slave) { | |
1692 | alb_swap_mac_addr(bond, swap_slave, bond->curr_active_slave); | |
059fe7a5 | 1693 | alb_fasten_mac_swap(bond, swap_slave, bond->curr_active_slave); |
1da177e4 | 1694 | } else { |
b924551b | 1695 | alb_set_slave_mac_addr(bond->curr_active_slave, bond_dev->dev_addr); |
1da177e4 | 1696 | |
815bcc27 | 1697 | read_lock(&bond->lock); |
1da177e4 LT |
1698 | alb_send_learning_packets(bond->curr_active_slave, bond_dev->dev_addr); |
1699 | if (bond->alb_info.rlb_enabled) { | |
1700 | /* inform clients mac address has changed */ | |
1701 | rlb_req_update_slave_clients(bond, bond->curr_active_slave); | |
1702 | } | |
815bcc27 | 1703 | read_unlock(&bond->lock); |
1da177e4 LT |
1704 | } |
1705 | ||
1706 | return 0; | |
1707 | } | |
1708 | ||
1709 | void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id) | |
1710 | { | |
1711 | if (bond->alb_info.current_alb_vlan && | |
1712 | (bond->alb_info.current_alb_vlan->vlan_id == vlan_id)) { | |
1713 | bond->alb_info.current_alb_vlan = NULL; | |
1714 | } | |
1715 | ||
1716 | if (bond->alb_info.rlb_enabled) { | |
1717 | rlb_clear_vlan(bond, vlan_id); | |
1718 | } | |
1719 | } | |
1720 |