Commit | Line | Data |
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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 | 334 | (client_info->ip_dst == arp->ip_src) && |
a6700db1 | 335 | (!ether_addr_equal_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 | ||
de063b70 ED |
345 | static int rlb_arp_recv(const struct sk_buff *skb, struct bonding *bond, |
346 | struct slave *slave) | |
1da177e4 | 347 | { |
de063b70 | 348 | struct arp_pkt *arp, _arp; |
1da177e4 | 349 | |
3aba891d | 350 | if (skb->protocol != cpu_to_be16(ETH_P_ARP)) |
b99215cd | 351 | goto out; |
1da177e4 | 352 | |
de063b70 ED |
353 | arp = skb_header_pointer(skb, 0, sizeof(_arp), &_arp); |
354 | if (!arp) | |
b99215cd | 355 | goto out; |
1da177e4 LT |
356 | |
357 | if (arp->op_code == htons(ARPOP_REPLY)) { | |
358 | /* update rx hash table for this ARP */ | |
359 | rlb_update_entry_from_arp(bond, arp); | |
5a03cdb7 | 360 | pr_debug("Server received an ARP Reply from client\n"); |
1da177e4 | 361 | } |
b99215cd DM |
362 | out: |
363 | return RX_HANDLER_ANOTHER; | |
1da177e4 LT |
364 | } |
365 | ||
366 | /* Caller must hold bond lock for read */ | |
367 | static struct slave *rlb_next_rx_slave(struct bonding *bond) | |
368 | { | |
369 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
370 | struct slave *rx_slave, *slave, *start_at; | |
371 | int i = 0; | |
372 | ||
373 | if (bond_info->next_rx_slave) { | |
374 | start_at = bond_info->next_rx_slave; | |
375 | } else { | |
376 | start_at = bond->first_slave; | |
377 | } | |
378 | ||
379 | rx_slave = NULL; | |
380 | ||
381 | bond_for_each_slave_from(bond, slave, i, start_at) { | |
382 | if (SLAVE_IS_OK(slave)) { | |
383 | if (!rx_slave) { | |
384 | rx_slave = slave; | |
385 | } else if (slave->speed > rx_slave->speed) { | |
386 | rx_slave = slave; | |
387 | } | |
388 | } | |
389 | } | |
390 | ||
391 | if (rx_slave) { | |
392 | bond_info->next_rx_slave = rx_slave->next; | |
393 | } | |
394 | ||
395 | return rx_slave; | |
396 | } | |
397 | ||
398 | /* teach the switch the mac of a disabled slave | |
399 | * on the primary for fault tolerance | |
400 | * | |
401 | * Caller must hold bond->curr_slave_lock for write or bond lock for write | |
402 | */ | |
403 | static void rlb_teach_disabled_mac_on_primary(struct bonding *bond, u8 addr[]) | |
404 | { | |
405 | if (!bond->curr_active_slave) { | |
406 | return; | |
407 | } | |
408 | ||
409 | if (!bond->alb_info.primary_is_promisc) { | |
7e1a1ac1 WC |
410 | if (!dev_set_promiscuity(bond->curr_active_slave->dev, 1)) |
411 | bond->alb_info.primary_is_promisc = 1; | |
412 | else | |
413 | bond->alb_info.primary_is_promisc = 0; | |
1da177e4 LT |
414 | } |
415 | ||
416 | bond->alb_info.rlb_promisc_timeout_counter = 0; | |
417 | ||
418 | alb_send_learning_packets(bond->curr_active_slave, addr); | |
419 | } | |
420 | ||
421 | /* slave being removed should not be active at this point | |
422 | * | |
423 | * Caller must hold bond lock for read | |
424 | */ | |
425 | static void rlb_clear_slave(struct bonding *bond, struct slave *slave) | |
426 | { | |
427 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
428 | struct rlb_client_info *rx_hash_table; | |
429 | u32 index, next_index; | |
430 | ||
431 | /* clear slave from rx_hashtbl */ | |
f515e6b7 | 432 | _lock_rx_hashtbl_bh(bond); |
1da177e4 LT |
433 | |
434 | rx_hash_table = bond_info->rx_hashtbl; | |
435 | index = bond_info->rx_hashtbl_head; | |
436 | for (; index != RLB_NULL_INDEX; index = next_index) { | |
437 | next_index = rx_hash_table[index].next; | |
438 | if (rx_hash_table[index].slave == slave) { | |
439 | struct slave *assigned_slave = rlb_next_rx_slave(bond); | |
440 | ||
441 | if (assigned_slave) { | |
442 | rx_hash_table[index].slave = assigned_slave; | |
a6700db1 JP |
443 | if (!ether_addr_equal_64bits(rx_hash_table[index].mac_dst, |
444 | mac_bcast)) { | |
1da177e4 LT |
445 | bond_info->rx_hashtbl[index].ntt = 1; |
446 | bond_info->rx_ntt = 1; | |
447 | /* A slave has been removed from the | |
448 | * table because it is either disabled | |
449 | * or being released. We must retry the | |
450 | * update to avoid clients from not | |
451 | * being updated & disconnecting when | |
452 | * there is stress | |
453 | */ | |
454 | bond_info->rlb_update_retry_counter = | |
455 | RLB_UPDATE_RETRY; | |
456 | } | |
457 | } else { /* there is no active slave */ | |
458 | rx_hash_table[index].slave = NULL; | |
459 | } | |
460 | } | |
461 | } | |
462 | ||
f515e6b7 | 463 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 | 464 | |
6603a6f2 | 465 | write_lock_bh(&bond->curr_slave_lock); |
1da177e4 LT |
466 | |
467 | if (slave != bond->curr_active_slave) { | |
468 | rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr); | |
469 | } | |
470 | ||
6603a6f2 | 471 | write_unlock_bh(&bond->curr_slave_lock); |
1da177e4 LT |
472 | } |
473 | ||
474 | static void rlb_update_client(struct rlb_client_info *client_info) | |
475 | { | |
476 | int i; | |
477 | ||
478 | if (!client_info->slave) { | |
479 | return; | |
480 | } | |
481 | ||
482 | for (i = 0; i < RLB_ARP_BURST_SIZE; i++) { | |
483 | struct sk_buff *skb; | |
484 | ||
485 | skb = arp_create(ARPOP_REPLY, ETH_P_ARP, | |
486 | client_info->ip_dst, | |
487 | client_info->slave->dev, | |
488 | client_info->ip_src, | |
489 | client_info->mac_dst, | |
490 | client_info->slave->dev->dev_addr, | |
491 | client_info->mac_dst); | |
492 | if (!skb) { | |
a4aee5c8 | 493 | pr_err("%s: Error: failed to create an ARP packet\n", |
4e0952c7 | 494 | client_info->slave->dev->master->name); |
1da177e4 LT |
495 | continue; |
496 | } | |
497 | ||
498 | skb->dev = client_info->slave->dev; | |
499 | ||
500 | if (client_info->tag) { | |
501 | skb = vlan_put_tag(skb, client_info->vlan_id); | |
502 | if (!skb) { | |
a4aee5c8 | 503 | pr_err("%s: Error: failed to insert VLAN tag\n", |
4e0952c7 | 504 | client_info->slave->dev->master->name); |
1da177e4 LT |
505 | continue; |
506 | } | |
507 | } | |
508 | ||
509 | arp_xmit(skb); | |
510 | } | |
511 | } | |
512 | ||
513 | /* sends ARP REPLIES that update the clients that need updating */ | |
514 | static void rlb_update_rx_clients(struct bonding *bond) | |
515 | { | |
516 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
517 | struct rlb_client_info *client_info; | |
518 | u32 hash_index; | |
519 | ||
f515e6b7 | 520 | _lock_rx_hashtbl_bh(bond); |
1da177e4 LT |
521 | |
522 | hash_index = bond_info->rx_hashtbl_head; | |
523 | for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) { | |
524 | client_info = &(bond_info->rx_hashtbl[hash_index]); | |
525 | if (client_info->ntt) { | |
526 | rlb_update_client(client_info); | |
527 | if (bond_info->rlb_update_retry_counter == 0) { | |
528 | client_info->ntt = 0; | |
529 | } | |
530 | } | |
531 | } | |
532 | ||
94e2bd68 | 533 | /* do not update the entries again until this counter is zero so that |
1da177e4 LT |
534 | * not to confuse the clients. |
535 | */ | |
536 | bond_info->rlb_update_delay_counter = RLB_UPDATE_DELAY; | |
537 | ||
f515e6b7 | 538 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 LT |
539 | } |
540 | ||
541 | /* The slave was assigned a new mac address - update the clients */ | |
542 | static void rlb_req_update_slave_clients(struct bonding *bond, struct slave *slave) | |
543 | { | |
544 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
545 | struct rlb_client_info *client_info; | |
546 | int ntt = 0; | |
547 | u32 hash_index; | |
548 | ||
f515e6b7 | 549 | _lock_rx_hashtbl_bh(bond); |
1da177e4 LT |
550 | |
551 | hash_index = bond_info->rx_hashtbl_head; | |
552 | for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) { | |
553 | client_info = &(bond_info->rx_hashtbl[hash_index]); | |
554 | ||
555 | if ((client_info->slave == slave) && | |
a6700db1 | 556 | !ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) { |
1da177e4 LT |
557 | client_info->ntt = 1; |
558 | ntt = 1; | |
559 | } | |
560 | } | |
561 | ||
562 | // update the team's flag only after the whole iteration | |
563 | if (ntt) { | |
564 | bond_info->rx_ntt = 1; | |
565 | //fasten the change | |
566 | bond_info->rlb_update_retry_counter = RLB_UPDATE_RETRY; | |
567 | } | |
568 | ||
f515e6b7 | 569 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 LT |
570 | } |
571 | ||
572 | /* mark all clients using src_ip to be updated */ | |
d3bb52b0 | 573 | static void rlb_req_update_subnet_clients(struct bonding *bond, __be32 src_ip) |
1da177e4 LT |
574 | { |
575 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
576 | struct rlb_client_info *client_info; | |
577 | u32 hash_index; | |
578 | ||
579 | _lock_rx_hashtbl(bond); | |
580 | ||
581 | hash_index = bond_info->rx_hashtbl_head; | |
582 | for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) { | |
583 | client_info = &(bond_info->rx_hashtbl[hash_index]); | |
584 | ||
585 | if (!client_info->slave) { | |
a4aee5c8 | 586 | pr_err("%s: Error: found a client with no channel in the client's hash table\n", |
4e0952c7 | 587 | bond->dev->name); |
1da177e4 LT |
588 | continue; |
589 | } | |
590 | /*update all clients using this src_ip, that are not assigned | |
591 | * to the team's address (curr_active_slave) and have a known | |
592 | * unicast mac address. | |
593 | */ | |
594 | if ((client_info->ip_src == src_ip) && | |
a6700db1 JP |
595 | !ether_addr_equal_64bits(client_info->slave->dev->dev_addr, |
596 | bond->dev->dev_addr) && | |
597 | !ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) { | |
1da177e4 LT |
598 | client_info->ntt = 1; |
599 | bond_info->rx_ntt = 1; | |
600 | } | |
601 | } | |
602 | ||
603 | _unlock_rx_hashtbl(bond); | |
604 | } | |
605 | ||
606 | /* Caller must hold both bond and ptr locks for read */ | |
607 | static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bond) | |
608 | { | |
609 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
a16aeb36 | 610 | struct arp_pkt *arp = arp_pkt(skb); |
1da177e4 LT |
611 | struct slave *assigned_slave; |
612 | struct rlb_client_info *client_info; | |
613 | u32 hash_index = 0; | |
614 | ||
615 | _lock_rx_hashtbl(bond); | |
616 | ||
e364a341 | 617 | hash_index = _simple_hash((u8 *)&arp->ip_dst, sizeof(arp->ip_dst)); |
1da177e4 LT |
618 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
619 | ||
620 | if (client_info->assigned) { | |
621 | if ((client_info->ip_src == arp->ip_src) && | |
622 | (client_info->ip_dst == arp->ip_dst)) { | |
623 | /* the entry is already assigned to this client */ | |
a6700db1 | 624 | if (!ether_addr_equal_64bits(arp->mac_dst, mac_bcast)) { |
1da177e4 LT |
625 | /* update mac address from arp */ |
626 | memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN); | |
627 | } | |
628 | ||
629 | assigned_slave = client_info->slave; | |
630 | if (assigned_slave) { | |
631 | _unlock_rx_hashtbl(bond); | |
632 | return assigned_slave; | |
633 | } | |
634 | } else { | |
635 | /* the entry is already assigned to some other client, | |
636 | * move the old client to primary (curr_active_slave) so | |
637 | * that the new client can be assigned to this entry. | |
638 | */ | |
639 | if (bond->curr_active_slave && | |
640 | client_info->slave != bond->curr_active_slave) { | |
641 | client_info->slave = bond->curr_active_slave; | |
642 | rlb_update_client(client_info); | |
643 | } | |
644 | } | |
645 | } | |
646 | /* assign a new slave */ | |
647 | assigned_slave = rlb_next_rx_slave(bond); | |
648 | ||
649 | if (assigned_slave) { | |
650 | client_info->ip_src = arp->ip_src; | |
651 | client_info->ip_dst = arp->ip_dst; | |
652 | /* arp->mac_dst is broadcast for arp reqeusts. | |
653 | * will be updated with clients actual unicast mac address | |
654 | * upon receiving an arp reply. | |
655 | */ | |
656 | memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN); | |
657 | client_info->slave = assigned_slave; | |
658 | ||
a6700db1 | 659 | if (!ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) { |
1da177e4 LT |
660 | client_info->ntt = 1; |
661 | bond->alb_info.rx_ntt = 1; | |
662 | } else { | |
663 | client_info->ntt = 0; | |
664 | } | |
665 | ||
cc0e4070 | 666 | if (bond_vlan_used(bond)) { |
966bc6f4 | 667 | if (!vlan_get_tag(skb, &client_info->vlan_id)) |
1da177e4 | 668 | client_info->tag = 1; |
1da177e4 LT |
669 | } |
670 | ||
671 | if (!client_info->assigned) { | |
672 | u32 prev_tbl_head = bond_info->rx_hashtbl_head; | |
673 | bond_info->rx_hashtbl_head = hash_index; | |
674 | client_info->next = prev_tbl_head; | |
675 | if (prev_tbl_head != RLB_NULL_INDEX) { | |
676 | bond_info->rx_hashtbl[prev_tbl_head].prev = | |
677 | hash_index; | |
678 | } | |
679 | client_info->assigned = 1; | |
680 | } | |
681 | } | |
682 | ||
683 | _unlock_rx_hashtbl(bond); | |
684 | ||
685 | return assigned_slave; | |
686 | } | |
687 | ||
688 | /* chooses (and returns) transmit channel for arp reply | |
689 | * does not choose channel for other arp types since they are | |
690 | * sent on the curr_active_slave | |
691 | */ | |
692 | static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond) | |
693 | { | |
a16aeb36 | 694 | struct arp_pkt *arp = arp_pkt(skb); |
1da177e4 LT |
695 | struct slave *tx_slave = NULL; |
696 | ||
567b871e | 697 | /* Don't modify or load balance ARPs that do not originate locally |
698 | * (e.g.,arrive via a bridge). | |
699 | */ | |
700 | if (!bond_slave_has_mac(bond, arp->mac_src)) | |
701 | return NULL; | |
702 | ||
f14c4e4e | 703 | if (arp->op_code == htons(ARPOP_REPLY)) { |
1da177e4 LT |
704 | /* the arp must be sent on the selected |
705 | * rx channel | |
706 | */ | |
707 | tx_slave = rlb_choose_channel(skb, bond); | |
708 | if (tx_slave) { | |
709 | memcpy(arp->mac_src,tx_slave->dev->dev_addr, ETH_ALEN); | |
710 | } | |
5a03cdb7 | 711 | pr_debug("Server sent ARP Reply packet\n"); |
f14c4e4e | 712 | } else if (arp->op_code == htons(ARPOP_REQUEST)) { |
1da177e4 LT |
713 | /* Create an entry in the rx_hashtbl for this client as a |
714 | * place holder. | |
715 | * When the arp reply is received the entry will be updated | |
716 | * with the correct unicast address of the client. | |
717 | */ | |
718 | rlb_choose_channel(skb, bond); | |
719 | ||
77c8e2c0 | 720 | /* The ARP reply packets must be delayed so that |
1da177e4 LT |
721 | * they can cancel out the influence of the ARP request. |
722 | */ | |
723 | bond->alb_info.rlb_update_delay_counter = RLB_UPDATE_DELAY; | |
724 | ||
725 | /* arp requests are broadcast and are sent on the primary | |
726 | * the arp request will collapse all clients on the subnet to | |
727 | * the primary slave. We must register these clients to be | |
728 | * updated with their assigned mac. | |
729 | */ | |
730 | rlb_req_update_subnet_clients(bond, arp->ip_src); | |
5a03cdb7 | 731 | pr_debug("Server sent ARP Request packet\n"); |
1da177e4 LT |
732 | } |
733 | ||
734 | return tx_slave; | |
735 | } | |
736 | ||
737 | /* Caller must hold bond lock for read */ | |
738 | static void rlb_rebalance(struct bonding *bond) | |
739 | { | |
740 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
741 | struct slave *assigned_slave; | |
742 | struct rlb_client_info *client_info; | |
743 | int ntt; | |
744 | u32 hash_index; | |
745 | ||
f515e6b7 | 746 | _lock_rx_hashtbl_bh(bond); |
1da177e4 LT |
747 | |
748 | ntt = 0; | |
749 | hash_index = bond_info->rx_hashtbl_head; | |
750 | for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) { | |
751 | client_info = &(bond_info->rx_hashtbl[hash_index]); | |
752 | assigned_slave = rlb_next_rx_slave(bond); | |
753 | if (assigned_slave && (client_info->slave != assigned_slave)) { | |
754 | client_info->slave = assigned_slave; | |
755 | client_info->ntt = 1; | |
756 | ntt = 1; | |
757 | } | |
758 | } | |
759 | ||
760 | /* update the team's flag only after the whole iteration */ | |
761 | if (ntt) { | |
762 | bond_info->rx_ntt = 1; | |
763 | } | |
f515e6b7 | 764 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 LT |
765 | } |
766 | ||
767 | /* Caller must hold rx_hashtbl lock */ | |
768 | static void rlb_init_table_entry(struct rlb_client_info *entry) | |
769 | { | |
770 | memset(entry, 0, sizeof(struct rlb_client_info)); | |
771 | entry->next = RLB_NULL_INDEX; | |
772 | entry->prev = RLB_NULL_INDEX; | |
773 | } | |
774 | ||
775 | static int rlb_initialize(struct bonding *bond) | |
776 | { | |
777 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
0d206a3a | 778 | struct rlb_client_info *new_hashtbl; |
1da177e4 LT |
779 | int size = RLB_HASH_TABLE_SIZE * sizeof(struct rlb_client_info); |
780 | int i; | |
781 | ||
0d206a3a | 782 | new_hashtbl = kmalloc(size, GFP_KERNEL); |
e404decb | 783 | if (!new_hashtbl) |
1da177e4 | 784 | return -1; |
e404decb | 785 | |
f515e6b7 | 786 | _lock_rx_hashtbl_bh(bond); |
0d206a3a MW |
787 | |
788 | bond_info->rx_hashtbl = new_hashtbl; | |
1da177e4 LT |
789 | |
790 | bond_info->rx_hashtbl_head = RLB_NULL_INDEX; | |
791 | ||
792 | for (i = 0; i < RLB_HASH_TABLE_SIZE; i++) { | |
793 | rlb_init_table_entry(bond_info->rx_hashtbl + i); | |
794 | } | |
795 | ||
f515e6b7 | 796 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 | 797 | |
1da177e4 | 798 | /* register to receive ARPs */ |
3aba891d | 799 | bond->recv_probe = rlb_arp_recv; |
1da177e4 LT |
800 | |
801 | return 0; | |
802 | } | |
803 | ||
804 | static void rlb_deinitialize(struct bonding *bond) | |
805 | { | |
806 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
807 | ||
f515e6b7 | 808 | _lock_rx_hashtbl_bh(bond); |
1da177e4 LT |
809 | |
810 | kfree(bond_info->rx_hashtbl); | |
811 | bond_info->rx_hashtbl = NULL; | |
812 | bond_info->rx_hashtbl_head = RLB_NULL_INDEX; | |
813 | ||
f515e6b7 | 814 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 LT |
815 | } |
816 | ||
817 | static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id) | |
818 | { | |
819 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
820 | u32 curr_index; | |
821 | ||
f515e6b7 | 822 | _lock_rx_hashtbl_bh(bond); |
1da177e4 LT |
823 | |
824 | curr_index = bond_info->rx_hashtbl_head; | |
825 | while (curr_index != RLB_NULL_INDEX) { | |
826 | struct rlb_client_info *curr = &(bond_info->rx_hashtbl[curr_index]); | |
827 | u32 next_index = bond_info->rx_hashtbl[curr_index].next; | |
828 | u32 prev_index = bond_info->rx_hashtbl[curr_index].prev; | |
829 | ||
830 | if (curr->tag && (curr->vlan_id == vlan_id)) { | |
831 | if (curr_index == bond_info->rx_hashtbl_head) { | |
832 | bond_info->rx_hashtbl_head = next_index; | |
833 | } | |
834 | if (prev_index != RLB_NULL_INDEX) { | |
835 | bond_info->rx_hashtbl[prev_index].next = next_index; | |
836 | } | |
837 | if (next_index != RLB_NULL_INDEX) { | |
838 | bond_info->rx_hashtbl[next_index].prev = prev_index; | |
839 | } | |
840 | ||
841 | rlb_init_table_entry(curr); | |
842 | } | |
843 | ||
844 | curr_index = next_index; | |
845 | } | |
846 | ||
f515e6b7 | 847 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 LT |
848 | } |
849 | ||
850 | /*********************** tlb/rlb shared functions *********************/ | |
851 | ||
852 | static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[]) | |
853 | { | |
854 | struct bonding *bond = bond_get_bond_by_slave(slave); | |
855 | struct learning_pkt pkt; | |
856 | int size = sizeof(struct learning_pkt); | |
857 | int i; | |
858 | ||
859 | memset(&pkt, 0, size); | |
860 | memcpy(pkt.mac_dst, mac_addr, ETH_ALEN); | |
861 | memcpy(pkt.mac_src, mac_addr, ETH_ALEN); | |
09640e63 | 862 | pkt.type = cpu_to_be16(ETH_P_LOOP); |
1da177e4 LT |
863 | |
864 | for (i = 0; i < MAX_LP_BURST; i++) { | |
865 | struct sk_buff *skb; | |
866 | char *data; | |
867 | ||
868 | skb = dev_alloc_skb(size); | |
869 | if (!skb) { | |
870 | return; | |
871 | } | |
872 | ||
873 | data = skb_put(skb, size); | |
874 | memcpy(data, &pkt, size); | |
875 | ||
459a98ed | 876 | skb_reset_mac_header(skb); |
b0e380b1 | 877 | skb->network_header = skb->mac_header + ETH_HLEN; |
1da177e4 LT |
878 | skb->protocol = pkt.type; |
879 | skb->priority = TC_PRIO_CONTROL; | |
880 | skb->dev = slave->dev; | |
881 | ||
cc0e4070 | 882 | if (bond_vlan_used(bond)) { |
1da177e4 LT |
883 | struct vlan_entry *vlan; |
884 | ||
885 | vlan = bond_next_vlan(bond, | |
886 | bond->alb_info.current_alb_vlan); | |
887 | ||
888 | bond->alb_info.current_alb_vlan = vlan; | |
889 | if (!vlan) { | |
890 | kfree_skb(skb); | |
891 | continue; | |
892 | } | |
893 | ||
894 | skb = vlan_put_tag(skb, vlan->vlan_id); | |
895 | if (!skb) { | |
a4aee5c8 | 896 | pr_err("%s: Error: failed to insert VLAN tag\n", |
4e0952c7 | 897 | bond->dev->name); |
1da177e4 LT |
898 | continue; |
899 | } | |
900 | } | |
901 | ||
902 | dev_queue_xmit(skb); | |
903 | } | |
904 | } | |
905 | ||
b924551b | 906 | static int alb_set_slave_mac_addr(struct slave *slave, u8 addr[]) |
1da177e4 LT |
907 | { |
908 | struct net_device *dev = slave->dev; | |
909 | struct sockaddr s_addr; | |
910 | ||
b924551b | 911 | if (slave->bond->params.mode == BOND_MODE_TLB) { |
1da177e4 LT |
912 | memcpy(dev->dev_addr, addr, dev->addr_len); |
913 | return 0; | |
914 | } | |
915 | ||
916 | /* for rlb each slave must have a unique hw mac addresses so that */ | |
917 | /* each slave will receive packets destined to a different mac */ | |
918 | memcpy(s_addr.sa_data, addr, dev->addr_len); | |
919 | s_addr.sa_family = dev->type; | |
920 | if (dev_set_mac_address(dev, &s_addr)) { | |
a4aee5c8 JP |
921 | pr_err("%s: Error: dev_set_mac_address of dev %s failed!\n" |
922 | "ALB mode requires that the base driver support setting the hw address also when the network device's interface is open\n", | |
4e0952c7 | 923 | dev->master->name, dev->name); |
1da177e4 LT |
924 | return -EOPNOTSUPP; |
925 | } | |
926 | return 0; | |
927 | } | |
928 | ||
059fe7a5 JV |
929 | /* |
930 | * Swap MAC addresses between two slaves. | |
931 | * | |
932 | * Called with RTNL held, and no other locks. | |
933 | * | |
934 | */ | |
935 | ||
1da177e4 LT |
936 | static void alb_swap_mac_addr(struct bonding *bond, struct slave *slave1, struct slave *slave2) |
937 | { | |
1da177e4 | 938 | u8 tmp_mac_addr[ETH_ALEN]; |
1da177e4 LT |
939 | |
940 | memcpy(tmp_mac_addr, slave1->dev->dev_addr, ETH_ALEN); | |
b924551b JB |
941 | alb_set_slave_mac_addr(slave1, slave2->dev->dev_addr); |
942 | alb_set_slave_mac_addr(slave2, tmp_mac_addr); | |
1da177e4 | 943 | |
059fe7a5 JV |
944 | } |
945 | ||
946 | /* | |
947 | * Send learning packets after MAC address swap. | |
948 | * | |
2543331d | 949 | * Called with RTNL and no other locks |
059fe7a5 JV |
950 | */ |
951 | static void alb_fasten_mac_swap(struct bonding *bond, struct slave *slave1, | |
952 | struct slave *slave2) | |
953 | { | |
954 | int slaves_state_differ = (SLAVE_IS_OK(slave1) != SLAVE_IS_OK(slave2)); | |
955 | struct slave *disabled_slave = NULL; | |
956 | ||
2543331d JV |
957 | ASSERT_RTNL(); |
958 | ||
1da177e4 LT |
959 | /* fasten the change in the switch */ |
960 | if (SLAVE_IS_OK(slave1)) { | |
961 | alb_send_learning_packets(slave1, slave1->dev->dev_addr); | |
962 | if (bond->alb_info.rlb_enabled) { | |
963 | /* inform the clients that the mac address | |
964 | * has changed | |
965 | */ | |
966 | rlb_req_update_slave_clients(bond, slave1); | |
967 | } | |
968 | } else { | |
969 | disabled_slave = slave1; | |
970 | } | |
971 | ||
972 | if (SLAVE_IS_OK(slave2)) { | |
973 | alb_send_learning_packets(slave2, slave2->dev->dev_addr); | |
974 | if (bond->alb_info.rlb_enabled) { | |
975 | /* inform the clients that the mac address | |
976 | * has changed | |
977 | */ | |
978 | rlb_req_update_slave_clients(bond, slave2); | |
979 | } | |
980 | } else { | |
981 | disabled_slave = slave2; | |
982 | } | |
983 | ||
984 | if (bond->alb_info.rlb_enabled && slaves_state_differ) { | |
985 | /* A disabled slave was assigned an active mac addr */ | |
986 | rlb_teach_disabled_mac_on_primary(bond, | |
987 | disabled_slave->dev->dev_addr); | |
988 | } | |
989 | } | |
990 | ||
991 | /** | |
992 | * alb_change_hw_addr_on_detach | |
993 | * @bond: bonding we're working on | |
994 | * @slave: the slave that was just detached | |
995 | * | |
996 | * We assume that @slave was already detached from the slave list. | |
997 | * | |
998 | * If @slave's permanent hw address is different both from its current | |
999 | * address and from @bond's address, then somewhere in the bond there's | |
1000 | * a slave that has @slave's permanet address as its current address. | |
1001 | * We'll make sure that that slave no longer uses @slave's permanent address. | |
1002 | * | |
2543331d | 1003 | * Caller must hold RTNL and no other locks |
1da177e4 LT |
1004 | */ |
1005 | static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *slave) | |
1006 | { | |
1007 | int perm_curr_diff; | |
1008 | int perm_bond_diff; | |
1009 | ||
a6700db1 JP |
1010 | perm_curr_diff = !ether_addr_equal_64bits(slave->perm_hwaddr, |
1011 | slave->dev->dev_addr); | |
1012 | perm_bond_diff = !ether_addr_equal_64bits(slave->perm_hwaddr, | |
1013 | bond->dev->dev_addr); | |
1da177e4 LT |
1014 | |
1015 | if (perm_curr_diff && perm_bond_diff) { | |
1016 | struct slave *tmp_slave; | |
1017 | int i, found = 0; | |
1018 | ||
1019 | bond_for_each_slave(bond, tmp_slave, i) { | |
a6700db1 JP |
1020 | if (ether_addr_equal_64bits(slave->perm_hwaddr, |
1021 | tmp_slave->dev->dev_addr)) { | |
1da177e4 LT |
1022 | found = 1; |
1023 | break; | |
1024 | } | |
1025 | } | |
1026 | ||
1027 | if (found) { | |
059fe7a5 | 1028 | /* locking: needs RTNL and nothing else */ |
1da177e4 | 1029 | alb_swap_mac_addr(bond, slave, tmp_slave); |
059fe7a5 | 1030 | alb_fasten_mac_swap(bond, slave, tmp_slave); |
1da177e4 LT |
1031 | } |
1032 | } | |
1033 | } | |
1034 | ||
1035 | /** | |
1036 | * alb_handle_addr_collision_on_attach | |
1037 | * @bond: bonding we're working on | |
1038 | * @slave: the slave that was just attached | |
1039 | * | |
1040 | * checks uniqueness of slave's mac address and handles the case the | |
1041 | * new slave uses the bonds mac address. | |
1042 | * | |
1043 | * If the permanent hw address of @slave is @bond's hw address, we need to | |
1044 | * find a different hw address to give @slave, that isn't in use by any other | |
77c8e2c0 | 1045 | * slave in the bond. This address must be, of course, one of the permanent |
1da177e4 LT |
1046 | * addresses of the other slaves. |
1047 | * | |
1048 | * We go over the slave list, and for each slave there we compare its | |
1049 | * permanent hw address with the current address of all the other slaves. | |
1050 | * If no match was found, then we've found a slave with a permanent address | |
1051 | * that isn't used by any other slave in the bond, so we can assign it to | |
1052 | * @slave. | |
1053 | * | |
1054 | * assumption: this function is called before @slave is attached to the | |
1055 | * bond slave list. | |
1056 | * | |
1057 | * caller must hold the bond lock for write since the mac addresses are compared | |
1058 | * and may be swapped. | |
1059 | */ | |
1060 | static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slave *slave) | |
1061 | { | |
1062 | struct slave *tmp_slave1, *tmp_slave2, *free_mac_slave; | |
1063 | struct slave *has_bond_addr = bond->curr_active_slave; | |
1064 | int i, j, found = 0; | |
1065 | ||
1066 | if (bond->slave_cnt == 0) { | |
1067 | /* this is the first slave */ | |
1068 | return 0; | |
1069 | } | |
1070 | ||
1071 | /* if slave's mac address differs from bond's mac address | |
1072 | * check uniqueness of slave's mac address against the other | |
1073 | * slaves in the bond. | |
1074 | */ | |
a6700db1 | 1075 | if (!ether_addr_equal_64bits(slave->perm_hwaddr, bond->dev->dev_addr)) { |
1da177e4 | 1076 | bond_for_each_slave(bond, tmp_slave1, i) { |
a6700db1 JP |
1077 | if (ether_addr_equal_64bits(tmp_slave1->dev->dev_addr, |
1078 | slave->dev->dev_addr)) { | |
1da177e4 LT |
1079 | found = 1; |
1080 | break; | |
1081 | } | |
1082 | } | |
1083 | ||
6b38aefe JL |
1084 | if (!found) |
1085 | return 0; | |
1da177e4 | 1086 | |
6b38aefe JL |
1087 | /* Try setting slave mac to bond address and fall-through |
1088 | to code handling that situation below... */ | |
b924551b | 1089 | alb_set_slave_mac_addr(slave, bond->dev->dev_addr); |
1da177e4 LT |
1090 | } |
1091 | ||
1092 | /* The slave's address is equal to the address of the bond. | |
1093 | * Search for a spare address in the bond for this slave. | |
1094 | */ | |
1095 | free_mac_slave = NULL; | |
1096 | ||
1097 | bond_for_each_slave(bond, tmp_slave1, i) { | |
1098 | found = 0; | |
1099 | bond_for_each_slave(bond, tmp_slave2, j) { | |
a6700db1 JP |
1100 | if (ether_addr_equal_64bits(tmp_slave1->perm_hwaddr, |
1101 | tmp_slave2->dev->dev_addr)) { | |
1da177e4 LT |
1102 | found = 1; |
1103 | break; | |
1104 | } | |
1105 | } | |
1106 | ||
1107 | if (!found) { | |
1108 | /* no slave has tmp_slave1's perm addr | |
1109 | * as its curr addr | |
1110 | */ | |
1111 | free_mac_slave = tmp_slave1; | |
1112 | break; | |
1113 | } | |
1114 | ||
1115 | if (!has_bond_addr) { | |
a6700db1 JP |
1116 | if (ether_addr_equal_64bits(tmp_slave1->dev->dev_addr, |
1117 | bond->dev->dev_addr)) { | |
1da177e4 LT |
1118 | |
1119 | has_bond_addr = tmp_slave1; | |
1120 | } | |
1121 | } | |
1122 | } | |
1123 | ||
1124 | if (free_mac_slave) { | |
b924551b | 1125 | alb_set_slave_mac_addr(slave, free_mac_slave->perm_hwaddr); |
1da177e4 | 1126 | |
a4aee5c8 | 1127 | 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 |
1128 | bond->dev->name, slave->dev->name, |
1129 | free_mac_slave->dev->name); | |
1da177e4 LT |
1130 | |
1131 | } else if (has_bond_addr) { | |
a4aee5c8 | 1132 | 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 | 1133 | bond->dev->name, slave->dev->name); |
1da177e4 LT |
1134 | return -EFAULT; |
1135 | } | |
1136 | ||
1137 | return 0; | |
1138 | } | |
1139 | ||
1140 | /** | |
1141 | * alb_set_mac_address | |
1142 | * @bond: | |
1143 | * @addr: | |
1144 | * | |
1145 | * In TLB mode all slaves are configured to the bond's hw address, but set | |
1146 | * their dev_addr field to different addresses (based on their permanent hw | |
1147 | * addresses). | |
1148 | * | |
1149 | * For each slave, this function sets the interface to the new address and then | |
1150 | * changes its dev_addr field to its previous value. | |
1151 | * | |
1152 | * Unwinding assumes bond's mac address has not yet changed. | |
1153 | */ | |
1154 | static int alb_set_mac_address(struct bonding *bond, void *addr) | |
1155 | { | |
1156 | struct sockaddr sa; | |
1157 | struct slave *slave, *stop_at; | |
1158 | char tmp_addr[ETH_ALEN]; | |
1159 | int res; | |
1160 | int i; | |
1161 | ||
1162 | if (bond->alb_info.rlb_enabled) { | |
1163 | return 0; | |
1164 | } | |
1165 | ||
1166 | bond_for_each_slave(bond, slave, i) { | |
1da177e4 LT |
1167 | /* save net_device's current hw address */ |
1168 | memcpy(tmp_addr, slave->dev->dev_addr, ETH_ALEN); | |
1169 | ||
1170 | res = dev_set_mac_address(slave->dev, addr); | |
1171 | ||
1172 | /* restore net_device's hw address */ | |
1173 | memcpy(slave->dev->dev_addr, tmp_addr, ETH_ALEN); | |
1174 | ||
eb7cc59a | 1175 | if (res) |
1da177e4 | 1176 | goto unwind; |
1da177e4 LT |
1177 | } |
1178 | ||
1179 | return 0; | |
1180 | ||
1181 | unwind: | |
1182 | memcpy(sa.sa_data, bond->dev->dev_addr, bond->dev->addr_len); | |
1183 | sa.sa_family = bond->dev->type; | |
1184 | ||
1185 | /* unwind from head to the slave that failed */ | |
1186 | stop_at = slave; | |
1187 | bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) { | |
1188 | memcpy(tmp_addr, slave->dev->dev_addr, ETH_ALEN); | |
1189 | dev_set_mac_address(slave->dev, &sa); | |
1190 | memcpy(slave->dev->dev_addr, tmp_addr, ETH_ALEN); | |
1191 | } | |
1192 | ||
1193 | return res; | |
1194 | } | |
1195 | ||
1196 | /************************ exported alb funcions ************************/ | |
1197 | ||
1198 | int bond_alb_initialize(struct bonding *bond, int rlb_enabled) | |
1199 | { | |
1200 | int res; | |
1201 | ||
1202 | res = tlb_initialize(bond); | |
1203 | if (res) { | |
1204 | return res; | |
1205 | } | |
1206 | ||
1207 | if (rlb_enabled) { | |
1208 | bond->alb_info.rlb_enabled = 1; | |
1209 | /* initialize rlb */ | |
1210 | res = rlb_initialize(bond); | |
1211 | if (res) { | |
1212 | tlb_deinitialize(bond); | |
1213 | return res; | |
1214 | } | |
b76850ab MW |
1215 | } else { |
1216 | bond->alb_info.rlb_enabled = 0; | |
1da177e4 LT |
1217 | } |
1218 | ||
1219 | return 0; | |
1220 | } | |
1221 | ||
1222 | void bond_alb_deinitialize(struct bonding *bond) | |
1223 | { | |
1224 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1225 | ||
1226 | tlb_deinitialize(bond); | |
1227 | ||
1228 | if (bond_info->rlb_enabled) { | |
1229 | rlb_deinitialize(bond); | |
1230 | } | |
1231 | } | |
1232 | ||
1233 | int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev) | |
1234 | { | |
454d7c9b | 1235 | struct bonding *bond = netdev_priv(bond_dev); |
1da177e4 LT |
1236 | struct ethhdr *eth_data; |
1237 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1238 | struct slave *tx_slave = NULL; | |
d3bb52b0 | 1239 | static const __be32 ip_bcast = htonl(0xffffffff); |
1da177e4 LT |
1240 | int hash_size = 0; |
1241 | int do_tx_balance = 1; | |
1242 | u32 hash_index = 0; | |
eddc9ec5 | 1243 | const u8 *hash_start = NULL; |
1da177e4 | 1244 | int res = 1; |
2d1ea19d | 1245 | struct ipv6hdr *ip6hdr; |
1da177e4 | 1246 | |
459a98ed | 1247 | skb_reset_mac_header(skb); |
1da177e4 LT |
1248 | eth_data = eth_hdr(skb); |
1249 | ||
0693e88e | 1250 | /* make sure that the curr_active_slave do not change during tx |
1da177e4 | 1251 | */ |
1da177e4 LT |
1252 | read_lock(&bond->curr_slave_lock); |
1253 | ||
1da177e4 | 1254 | switch (ntohs(skb->protocol)) { |
eddc9ec5 ACM |
1255 | case ETH_P_IP: { |
1256 | const struct iphdr *iph = ip_hdr(skb); | |
1257 | ||
a6700db1 | 1258 | if (ether_addr_equal_64bits(eth_data->h_dest, mac_bcast) || |
eddc9ec5 ACM |
1259 | (iph->daddr == ip_bcast) || |
1260 | (iph->protocol == IPPROTO_IGMP)) { | |
1da177e4 LT |
1261 | do_tx_balance = 0; |
1262 | break; | |
1263 | } | |
eddc9ec5 ACM |
1264 | hash_start = (char *)&(iph->daddr); |
1265 | hash_size = sizeof(iph->daddr); | |
1266 | } | |
1da177e4 LT |
1267 | break; |
1268 | case ETH_P_IPV6: | |
2d1ea19d VY |
1269 | /* IPv6 doesn't really use broadcast mac address, but leave |
1270 | * that here just in case. | |
1271 | */ | |
a6700db1 | 1272 | if (ether_addr_equal_64bits(eth_data->h_dest, mac_bcast)) { |
1da177e4 LT |
1273 | do_tx_balance = 0; |
1274 | break; | |
2d1ea19d VY |
1275 | } |
1276 | ||
1277 | /* IPv6 uses all-nodes multicast as an equivalent to | |
1278 | * broadcasts in IPv4. | |
1279 | */ | |
a6700db1 | 1280 | if (ether_addr_equal_64bits(eth_data->h_dest, mac_v6_allmcast)) { |
2d1ea19d VY |
1281 | do_tx_balance = 0; |
1282 | break; | |
1283 | } | |
1284 | ||
1285 | /* Additianally, DAD probes should not be tx-balanced as that | |
1286 | * will lead to false positives for duplicate addresses and | |
1287 | * prevent address configuration from working. | |
1288 | */ | |
1289 | ip6hdr = ipv6_hdr(skb); | |
1290 | if (ipv6_addr_any(&ip6hdr->saddr)) { | |
1291 | do_tx_balance = 0; | |
1292 | break; | |
1da177e4 LT |
1293 | } |
1294 | ||
0660e03f ACM |
1295 | hash_start = (char *)&(ipv6_hdr(skb)->daddr); |
1296 | hash_size = sizeof(ipv6_hdr(skb)->daddr); | |
1da177e4 LT |
1297 | break; |
1298 | case ETH_P_IPX: | |
d3bb52b0 | 1299 | if (ipx_hdr(skb)->ipx_checksum != IPX_NO_CHECKSUM) { |
1da177e4 LT |
1300 | /* something is wrong with this packet */ |
1301 | do_tx_balance = 0; | |
1302 | break; | |
1303 | } | |
1304 | ||
1305 | if (ipx_hdr(skb)->ipx_type != IPX_TYPE_NCP) { | |
1306 | /* The only protocol worth balancing in | |
1307 | * this family since it has an "ARP" like | |
1308 | * mechanism | |
1309 | */ | |
1310 | do_tx_balance = 0; | |
1311 | break; | |
1312 | } | |
1313 | ||
1314 | hash_start = (char*)eth_data->h_dest; | |
1315 | hash_size = ETH_ALEN; | |
1316 | break; | |
1317 | case ETH_P_ARP: | |
1318 | do_tx_balance = 0; | |
1319 | if (bond_info->rlb_enabled) { | |
1320 | tx_slave = rlb_arp_xmit(skb, bond); | |
1321 | } | |
1322 | break; | |
1323 | default: | |
1324 | do_tx_balance = 0; | |
1325 | break; | |
1326 | } | |
1327 | ||
1328 | if (do_tx_balance) { | |
1329 | hash_index = _simple_hash(hash_start, hash_size); | |
1330 | tx_slave = tlb_choose_channel(bond, hash_index, skb->len); | |
1331 | } | |
1332 | ||
1333 | if (!tx_slave) { | |
1334 | /* unbalanced or unassigned, send through primary */ | |
1335 | tx_slave = bond->curr_active_slave; | |
1336 | bond_info->unbalanced_load += skb->len; | |
1337 | } | |
1338 | ||
1339 | if (tx_slave && SLAVE_IS_OK(tx_slave)) { | |
1340 | if (tx_slave != bond->curr_active_slave) { | |
1341 | memcpy(eth_data->h_source, | |
1342 | tx_slave->dev->dev_addr, | |
1343 | ETH_ALEN); | |
1344 | } | |
1345 | ||
1346 | res = bond_dev_queue_xmit(bond, skb, tx_slave->dev); | |
1347 | } else { | |
1348 | if (tx_slave) { | |
f515e6b7 MU |
1349 | _lock_tx_hashtbl(bond); |
1350 | __tlb_clear_slave(bond, tx_slave, 0); | |
1351 | _unlock_tx_hashtbl(bond); | |
1da177e4 LT |
1352 | } |
1353 | } | |
1354 | ||
04502430 ED |
1355 | read_unlock(&bond->curr_slave_lock); |
1356 | ||
1da177e4 LT |
1357 | if (res) { |
1358 | /* no suitable interface, frame not sent */ | |
04502430 | 1359 | kfree_skb(skb); |
1da177e4 | 1360 | } |
ec634fe3 | 1361 | return NETDEV_TX_OK; |
1da177e4 LT |
1362 | } |
1363 | ||
1b76b316 | 1364 | void bond_alb_monitor(struct work_struct *work) |
1da177e4 | 1365 | { |
1b76b316 JV |
1366 | struct bonding *bond = container_of(work, struct bonding, |
1367 | alb_work.work); | |
1da177e4 LT |
1368 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
1369 | struct slave *slave; | |
1370 | int i; | |
1371 | ||
1372 | read_lock(&bond->lock); | |
1373 | ||
1da177e4 LT |
1374 | if (bond->slave_cnt == 0) { |
1375 | bond_info->tx_rebalance_counter = 0; | |
1376 | bond_info->lp_counter = 0; | |
1377 | goto re_arm; | |
1378 | } | |
1379 | ||
1380 | bond_info->tx_rebalance_counter++; | |
1381 | bond_info->lp_counter++; | |
1382 | ||
1383 | /* send learning packets */ | |
1384 | if (bond_info->lp_counter >= BOND_ALB_LP_TICKS) { | |
1385 | /* change of curr_active_slave involves swapping of mac addresses. | |
1386 | * in order to avoid this swapping from happening while | |
1387 | * sending the learning packets, the curr_slave_lock must be held for | |
1388 | * read. | |
1389 | */ | |
1390 | read_lock(&bond->curr_slave_lock); | |
1391 | ||
1392 | bond_for_each_slave(bond, slave, i) { | |
e944ef79 | 1393 | alb_send_learning_packets(slave, slave->dev->dev_addr); |
1da177e4 LT |
1394 | } |
1395 | ||
1396 | read_unlock(&bond->curr_slave_lock); | |
1397 | ||
1398 | bond_info->lp_counter = 0; | |
1399 | } | |
1400 | ||
1401 | /* rebalance tx traffic */ | |
1402 | if (bond_info->tx_rebalance_counter >= BOND_TLB_REBALANCE_TICKS) { | |
1403 | ||
1404 | read_lock(&bond->curr_slave_lock); | |
1405 | ||
1406 | bond_for_each_slave(bond, slave, i) { | |
1407 | tlb_clear_slave(bond, slave, 1); | |
1408 | if (slave == bond->curr_active_slave) { | |
1409 | SLAVE_TLB_INFO(slave).load = | |
1410 | bond_info->unbalanced_load / | |
1411 | BOND_TLB_REBALANCE_INTERVAL; | |
1412 | bond_info->unbalanced_load = 0; | |
1413 | } | |
1414 | } | |
1415 | ||
1416 | read_unlock(&bond->curr_slave_lock); | |
1417 | ||
1418 | bond_info->tx_rebalance_counter = 0; | |
1419 | } | |
1420 | ||
1421 | /* handle rlb stuff */ | |
1422 | if (bond_info->rlb_enabled) { | |
1da177e4 LT |
1423 | if (bond_info->primary_is_promisc && |
1424 | (++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) { | |
1425 | ||
d0e81b7e JV |
1426 | /* |
1427 | * dev_set_promiscuity requires rtnl and | |
e6d265e8 | 1428 | * nothing else. Avoid race with bond_close. |
d0e81b7e JV |
1429 | */ |
1430 | read_unlock(&bond->lock); | |
e6d265e8 JV |
1431 | if (!rtnl_trylock()) { |
1432 | read_lock(&bond->lock); | |
1433 | goto re_arm; | |
1434 | } | |
d0e81b7e | 1435 | |
1da177e4 LT |
1436 | bond_info->rlb_promisc_timeout_counter = 0; |
1437 | ||
1438 | /* If the primary was set to promiscuous mode | |
1439 | * because a slave was disabled then | |
1440 | * it can now leave promiscuous mode. | |
1441 | */ | |
1442 | dev_set_promiscuity(bond->curr_active_slave->dev, -1); | |
1443 | bond_info->primary_is_promisc = 0; | |
1da177e4 | 1444 | |
d0e81b7e JV |
1445 | rtnl_unlock(); |
1446 | read_lock(&bond->lock); | |
1447 | } | |
1da177e4 LT |
1448 | |
1449 | if (bond_info->rlb_rebalance) { | |
1450 | bond_info->rlb_rebalance = 0; | |
1451 | rlb_rebalance(bond); | |
1452 | } | |
1453 | ||
1454 | /* check if clients need updating */ | |
1455 | if (bond_info->rx_ntt) { | |
1456 | if (bond_info->rlb_update_delay_counter) { | |
1457 | --bond_info->rlb_update_delay_counter; | |
1458 | } else { | |
1459 | rlb_update_rx_clients(bond); | |
1460 | if (bond_info->rlb_update_retry_counter) { | |
1461 | --bond_info->rlb_update_retry_counter; | |
1462 | } else { | |
1463 | bond_info->rx_ntt = 0; | |
1464 | } | |
1465 | } | |
1466 | } | |
1467 | } | |
1468 | ||
1469 | re_arm: | |
e6d265e8 JV |
1470 | queue_delayed_work(bond->wq, &bond->alb_work, alb_delta_in_ticks); |
1471 | ||
1da177e4 LT |
1472 | read_unlock(&bond->lock); |
1473 | } | |
1474 | ||
1475 | /* assumption: called before the slave is attached to the bond | |
1476 | * and not locked by the bond lock | |
1477 | */ | |
1478 | int bond_alb_init_slave(struct bonding *bond, struct slave *slave) | |
1479 | { | |
1480 | int res; | |
1481 | ||
b924551b | 1482 | res = alb_set_slave_mac_addr(slave, slave->perm_hwaddr); |
1da177e4 LT |
1483 | if (res) { |
1484 | return res; | |
1485 | } | |
1486 | ||
1487 | /* caller must hold the bond lock for write since the mac addresses | |
1488 | * are compared and may be swapped. | |
1489 | */ | |
6603a6f2 | 1490 | read_lock(&bond->lock); |
1da177e4 LT |
1491 | |
1492 | res = alb_handle_addr_collision_on_attach(bond, slave); | |
1493 | ||
6603a6f2 | 1494 | read_unlock(&bond->lock); |
1da177e4 LT |
1495 | |
1496 | if (res) { | |
1497 | return res; | |
1498 | } | |
1499 | ||
1500 | tlb_init_slave(slave); | |
1501 | ||
1502 | /* order a rebalance ASAP */ | |
1503 | bond->alb_info.tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS; | |
1504 | ||
1505 | if (bond->alb_info.rlb_enabled) { | |
1506 | bond->alb_info.rlb_rebalance = 1; | |
1507 | } | |
1508 | ||
1509 | return 0; | |
1510 | } | |
1511 | ||
2543331d JV |
1512 | /* |
1513 | * Remove slave from tlb and rlb hash tables, and fix up MAC addresses | |
1514 | * if necessary. | |
1515 | * | |
1516 | * Caller must hold RTNL and no other locks | |
1517 | */ | |
1da177e4 LT |
1518 | void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave) |
1519 | { | |
1520 | if (bond->slave_cnt > 1) { | |
1521 | alb_change_hw_addr_on_detach(bond, slave); | |
1522 | } | |
1523 | ||
1524 | tlb_clear_slave(bond, slave, 0); | |
1525 | ||
1526 | if (bond->alb_info.rlb_enabled) { | |
1527 | bond->alb_info.next_rx_slave = NULL; | |
1528 | rlb_clear_slave(bond, slave); | |
1529 | } | |
1530 | } | |
1531 | ||
1532 | /* Caller must hold bond lock for read */ | |
1533 | void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link) | |
1534 | { | |
1535 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1536 | ||
1537 | if (link == BOND_LINK_DOWN) { | |
1538 | tlb_clear_slave(bond, slave, 0); | |
1539 | if (bond->alb_info.rlb_enabled) { | |
1540 | rlb_clear_slave(bond, slave); | |
1541 | } | |
1542 | } else if (link == BOND_LINK_UP) { | |
1543 | /* order a rebalance ASAP */ | |
1544 | bond_info->tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS; | |
1545 | if (bond->alb_info.rlb_enabled) { | |
1546 | bond->alb_info.rlb_rebalance = 1; | |
1547 | /* If the updelay module parameter is smaller than the | |
1548 | * forwarding delay of the switch the rebalance will | |
1549 | * not work because the rebalance arp replies will | |
1550 | * not be forwarded to the clients.. | |
1551 | */ | |
1552 | } | |
1553 | } | |
1554 | } | |
1555 | ||
1556 | /** | |
1557 | * bond_alb_handle_active_change - assign new curr_active_slave | |
1558 | * @bond: our bonding struct | |
1559 | * @new_slave: new slave to assign | |
1560 | * | |
1561 | * Set the bond->curr_active_slave to @new_slave and handle | |
1562 | * mac address swapping and promiscuity changes as needed. | |
1563 | * | |
059fe7a5 JV |
1564 | * If new_slave is NULL, caller must hold curr_slave_lock or |
1565 | * bond->lock for write. | |
1566 | * | |
1567 | * If new_slave is not NULL, caller must hold RTNL, bond->lock for | |
1568 | * read and curr_slave_lock for write. Processing here may sleep, so | |
1569 | * no other locks may be held. | |
1da177e4 LT |
1570 | */ |
1571 | void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave) | |
1f78d9f9 HE |
1572 | __releases(&bond->curr_slave_lock) |
1573 | __releases(&bond->lock) | |
1574 | __acquires(&bond->lock) | |
1575 | __acquires(&bond->curr_slave_lock) | |
1da177e4 LT |
1576 | { |
1577 | struct slave *swap_slave; | |
1578 | int i; | |
1579 | ||
1580 | if (bond->curr_active_slave == new_slave) { | |
1581 | return; | |
1582 | } | |
1583 | ||
1584 | if (bond->curr_active_slave && bond->alb_info.primary_is_promisc) { | |
1585 | dev_set_promiscuity(bond->curr_active_slave->dev, -1); | |
1586 | bond->alb_info.primary_is_promisc = 0; | |
1587 | bond->alb_info.rlb_promisc_timeout_counter = 0; | |
1588 | } | |
1589 | ||
1590 | swap_slave = bond->curr_active_slave; | |
1591 | bond->curr_active_slave = new_slave; | |
1592 | ||
1593 | if (!new_slave || (bond->slave_cnt == 0)) { | |
1594 | return; | |
1595 | } | |
1596 | ||
1597 | /* set the new curr_active_slave to the bonds mac address | |
1598 | * i.e. swap mac addresses of old curr_active_slave and new curr_active_slave | |
1599 | */ | |
1600 | if (!swap_slave) { | |
1601 | struct slave *tmp_slave; | |
1602 | /* find slave that is holding the bond's mac address */ | |
1603 | bond_for_each_slave(bond, tmp_slave, i) { | |
a6700db1 JP |
1604 | if (ether_addr_equal_64bits(tmp_slave->dev->dev_addr, |
1605 | bond->dev->dev_addr)) { | |
1da177e4 LT |
1606 | swap_slave = tmp_slave; |
1607 | break; | |
1608 | } | |
1609 | } | |
1610 | } | |
1611 | ||
059fe7a5 JV |
1612 | /* |
1613 | * Arrange for swap_slave and new_slave to temporarily be | |
1614 | * ignored so we can mess with their MAC addresses without | |
1615 | * fear of interference from transmit activity. | |
1616 | */ | |
1617 | if (swap_slave) { | |
1618 | tlb_clear_slave(bond, swap_slave, 1); | |
1619 | } | |
1620 | tlb_clear_slave(bond, new_slave, 1); | |
1621 | ||
1622 | write_unlock_bh(&bond->curr_slave_lock); | |
1623 | read_unlock(&bond->lock); | |
1624 | ||
e0138a66 JV |
1625 | ASSERT_RTNL(); |
1626 | ||
1da177e4 LT |
1627 | /* curr_active_slave must be set before calling alb_swap_mac_addr */ |
1628 | if (swap_slave) { | |
1629 | /* swap mac address */ | |
1630 | alb_swap_mac_addr(bond, swap_slave, new_slave); | |
1631 | } else { | |
1632 | /* set the new_slave to the bond mac address */ | |
b924551b | 1633 | alb_set_slave_mac_addr(new_slave, bond->dev->dev_addr); |
059fe7a5 JV |
1634 | } |
1635 | ||
059fe7a5 JV |
1636 | if (swap_slave) { |
1637 | alb_fasten_mac_swap(bond, swap_slave, new_slave); | |
2543331d | 1638 | read_lock(&bond->lock); |
059fe7a5 | 1639 | } else { |
2543331d | 1640 | read_lock(&bond->lock); |
1da177e4 LT |
1641 | alb_send_learning_packets(new_slave, bond->dev->dev_addr); |
1642 | } | |
059fe7a5 JV |
1643 | |
1644 | write_lock_bh(&bond->curr_slave_lock); | |
1da177e4 LT |
1645 | } |
1646 | ||
059fe7a5 JV |
1647 | /* |
1648 | * Called with RTNL | |
1649 | */ | |
1da177e4 | 1650 | int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr) |
1f78d9f9 | 1651 | __acquires(&bond->lock) |
815bcc27 | 1652 | __releases(&bond->lock) |
1da177e4 | 1653 | { |
454d7c9b | 1654 | struct bonding *bond = netdev_priv(bond_dev); |
1da177e4 LT |
1655 | struct sockaddr *sa = addr; |
1656 | struct slave *slave, *swap_slave; | |
1657 | int res; | |
1658 | int i; | |
1659 | ||
1660 | if (!is_valid_ether_addr(sa->sa_data)) { | |
1661 | return -EADDRNOTAVAIL; | |
1662 | } | |
1663 | ||
1664 | res = alb_set_mac_address(bond, addr); | |
1665 | if (res) { | |
1666 | return res; | |
1667 | } | |
1668 | ||
1669 | memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len); | |
1670 | ||
1671 | /* If there is no curr_active_slave there is nothing else to do. | |
1672 | * Otherwise we'll need to pass the new address to it and handle | |
1673 | * duplications. | |
1674 | */ | |
1675 | if (!bond->curr_active_slave) { | |
1676 | return 0; | |
1677 | } | |
1678 | ||
1679 | swap_slave = NULL; | |
1680 | ||
1681 | bond_for_each_slave(bond, slave, i) { | |
a6700db1 JP |
1682 | if (ether_addr_equal_64bits(slave->dev->dev_addr, |
1683 | bond_dev->dev_addr)) { | |
1da177e4 LT |
1684 | swap_slave = slave; |
1685 | break; | |
1686 | } | |
1687 | } | |
1688 | ||
1689 | if (swap_slave) { | |
1690 | alb_swap_mac_addr(bond, swap_slave, bond->curr_active_slave); | |
059fe7a5 | 1691 | alb_fasten_mac_swap(bond, swap_slave, bond->curr_active_slave); |
1da177e4 | 1692 | } else { |
b924551b | 1693 | alb_set_slave_mac_addr(bond->curr_active_slave, bond_dev->dev_addr); |
1da177e4 | 1694 | |
815bcc27 | 1695 | read_lock(&bond->lock); |
1da177e4 LT |
1696 | alb_send_learning_packets(bond->curr_active_slave, bond_dev->dev_addr); |
1697 | if (bond->alb_info.rlb_enabled) { | |
1698 | /* inform clients mac address has changed */ | |
1699 | rlb_req_update_slave_clients(bond, bond->curr_active_slave); | |
1700 | } | |
815bcc27 | 1701 | read_unlock(&bond->lock); |
1da177e4 LT |
1702 | } |
1703 | ||
1704 | return 0; | |
1705 | } | |
1706 | ||
1707 | void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id) | |
1708 | { | |
1709 | if (bond->alb_info.current_alb_vlan && | |
1710 | (bond->alb_info.current_alb_vlan->vlan_id == vlan_id)) { | |
1711 | bond->alb_info.current_alb_vlan = NULL; | |
1712 | } | |
1713 | ||
1714 | if (bond->alb_info.rlb_enabled) { | |
1715 | rlb_clear_vlan(bond, vlan_id); | |
1716 | } | |
1717 | } | |
1718 |