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 | |
adf8d3ff | 15 | * with this program; if not, see <http://www.gnu.org/licenses/>. |
1da177e4 LT |
16 | * |
17 | * The full GNU General Public License is included in this distribution in the | |
18 | * file called LICENSE. | |
19 | * | |
1da177e4 LT |
20 | */ |
21 | ||
a4aee5c8 JP |
22 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
23 | ||
1da177e4 LT |
24 | #include <linux/skbuff.h> |
25 | #include <linux/netdevice.h> | |
26 | #include <linux/etherdevice.h> | |
27 | #include <linux/pkt_sched.h> | |
28 | #include <linux/spinlock.h> | |
29 | #include <linux/slab.h> | |
30 | #include <linux/timer.h> | |
31 | #include <linux/ip.h> | |
32 | #include <linux/ipv6.h> | |
33 | #include <linux/if_arp.h> | |
34 | #include <linux/if_ether.h> | |
35 | #include <linux/if_bonding.h> | |
36 | #include <linux/if_vlan.h> | |
37 | #include <linux/in.h> | |
38 | #include <net/ipx.h> | |
39 | #include <net/arp.h> | |
2d1ea19d | 40 | #include <net/ipv6.h> |
1da177e4 LT |
41 | #include <asm/byteorder.h> |
42 | #include "bonding.h" | |
43 | #include "bond_alb.h" | |
44 | ||
45 | ||
1da177e4 | 46 | |
885a136c ED |
47 | #ifndef __long_aligned |
48 | #define __long_aligned __attribute__((aligned((sizeof(long))))) | |
49 | #endif | |
50 | static const u8 mac_bcast[ETH_ALEN] __long_aligned = { | |
51 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff | |
52 | }; | |
53 | static const u8 mac_v6_allmcast[ETH_ALEN] __long_aligned = { | |
54 | 0x33, 0x33, 0x00, 0x00, 0x00, 0x01 | |
55 | }; | |
1da177e4 LT |
56 | static const int alb_delta_in_ticks = HZ / ALB_TIMER_TICKS_PER_SEC; |
57 | ||
58 | #pragma pack(1) | |
59 | struct learning_pkt { | |
60 | u8 mac_dst[ETH_ALEN]; | |
61 | u8 mac_src[ETH_ALEN]; | |
d3bb52b0 | 62 | __be16 type; |
1da177e4 LT |
63 | u8 padding[ETH_ZLEN - ETH_HLEN]; |
64 | }; | |
65 | ||
66 | struct arp_pkt { | |
d3bb52b0 AV |
67 | __be16 hw_addr_space; |
68 | __be16 prot_addr_space; | |
1da177e4 LT |
69 | u8 hw_addr_len; |
70 | u8 prot_addr_len; | |
d3bb52b0 | 71 | __be16 op_code; |
1da177e4 | 72 | u8 mac_src[ETH_ALEN]; /* sender hardware address */ |
d3bb52b0 | 73 | __be32 ip_src; /* sender IP address */ |
1da177e4 | 74 | u8 mac_dst[ETH_ALEN]; /* target hardware address */ |
d3bb52b0 | 75 | __be32 ip_dst; /* target IP address */ |
1da177e4 LT |
76 | }; |
77 | #pragma pack() | |
78 | ||
a16aeb36 ACM |
79 | static inline struct arp_pkt *arp_pkt(const struct sk_buff *skb) |
80 | { | |
d56f90a7 | 81 | return (struct arp_pkt *)skb_network_header(skb); |
a16aeb36 ACM |
82 | } |
83 | ||
1da177e4 LT |
84 | /* Forward declaration */ |
85 | static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[]); | |
e53665c6 JB |
86 | static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp); |
87 | static void rlb_src_unlink(struct bonding *bond, u32 index); | |
88 | static void rlb_src_link(struct bonding *bond, u32 ip_src_hash, | |
89 | u32 ip_dst_hash); | |
1da177e4 | 90 | |
eddc9ec5 | 91 | static inline u8 _simple_hash(const u8 *hash_start, int hash_size) |
1da177e4 LT |
92 | { |
93 | int i; | |
94 | u8 hash = 0; | |
95 | ||
96 | for (i = 0; i < hash_size; i++) { | |
97 | hash ^= hash_start[i]; | |
98 | } | |
99 | ||
100 | return hash; | |
101 | } | |
102 | ||
103 | /*********************** tlb specific functions ***************************/ | |
104 | ||
f515e6b7 | 105 | static inline void _lock_tx_hashtbl_bh(struct bonding *bond) |
1da177e4 | 106 | { |
6603a6f2 | 107 | spin_lock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock)); |
1da177e4 LT |
108 | } |
109 | ||
f515e6b7 | 110 | static inline void _unlock_tx_hashtbl_bh(struct bonding *bond) |
1da177e4 | 111 | { |
6603a6f2 | 112 | spin_unlock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock)); |
1da177e4 LT |
113 | } |
114 | ||
f515e6b7 MU |
115 | static inline void _lock_tx_hashtbl(struct bonding *bond) |
116 | { | |
117 | spin_lock(&(BOND_ALB_INFO(bond).tx_hashtbl_lock)); | |
118 | } | |
119 | ||
120 | static inline void _unlock_tx_hashtbl(struct bonding *bond) | |
121 | { | |
122 | spin_unlock(&(BOND_ALB_INFO(bond).tx_hashtbl_lock)); | |
123 | } | |
124 | ||
1da177e4 LT |
125 | /* Caller must hold tx_hashtbl lock */ |
126 | static inline void tlb_init_table_entry(struct tlb_client_info *entry, int save_load) | |
127 | { | |
128 | if (save_load) { | |
129 | entry->load_history = 1 + entry->tx_bytes / | |
130 | BOND_TLB_REBALANCE_INTERVAL; | |
131 | entry->tx_bytes = 0; | |
132 | } | |
133 | ||
134 | entry->tx_slave = NULL; | |
135 | entry->next = TLB_NULL_INDEX; | |
136 | entry->prev = TLB_NULL_INDEX; | |
137 | } | |
138 | ||
139 | static inline void tlb_init_slave(struct slave *slave) | |
140 | { | |
141 | SLAVE_TLB_INFO(slave).load = 0; | |
142 | SLAVE_TLB_INFO(slave).head = TLB_NULL_INDEX; | |
143 | } | |
144 | ||
f515e6b7 MU |
145 | /* Caller must hold bond lock for read, BH disabled */ |
146 | static void __tlb_clear_slave(struct bonding *bond, struct slave *slave, | |
147 | int save_load) | |
1da177e4 LT |
148 | { |
149 | struct tlb_client_info *tx_hash_table; | |
150 | u32 index; | |
151 | ||
1da177e4 LT |
152 | /* clear slave from tx_hashtbl */ |
153 | tx_hash_table = BOND_ALB_INFO(bond).tx_hashtbl; | |
154 | ||
ce39a800 AG |
155 | /* skip this if we've already freed the tx hash table */ |
156 | if (tx_hash_table) { | |
157 | index = SLAVE_TLB_INFO(slave).head; | |
158 | while (index != TLB_NULL_INDEX) { | |
159 | u32 next_index = tx_hash_table[index].next; | |
160 | tlb_init_table_entry(&tx_hash_table[index], save_load); | |
161 | index = next_index; | |
162 | } | |
1da177e4 LT |
163 | } |
164 | ||
1da177e4 | 165 | tlb_init_slave(slave); |
f515e6b7 | 166 | } |
5af47b2f | 167 | |
f515e6b7 MU |
168 | /* Caller must hold bond lock for read */ |
169 | static void tlb_clear_slave(struct bonding *bond, struct slave *slave, | |
170 | int save_load) | |
171 | { | |
172 | _lock_tx_hashtbl_bh(bond); | |
173 | __tlb_clear_slave(bond, slave, save_load); | |
174 | _unlock_tx_hashtbl_bh(bond); | |
1da177e4 LT |
175 | } |
176 | ||
177 | /* Must be called before starting the monitor timer */ | |
178 | static int tlb_initialize(struct bonding *bond) | |
179 | { | |
180 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
181 | int size = TLB_HASH_TABLE_SIZE * sizeof(struct tlb_client_info); | |
0d206a3a | 182 | struct tlb_client_info *new_hashtbl; |
1da177e4 LT |
183 | int i; |
184 | ||
243cb4e5 | 185 | new_hashtbl = kzalloc(size, GFP_KERNEL); |
e404decb | 186 | if (!new_hashtbl) |
1da177e4 | 187 | return -1; |
e404decb | 188 | |
f515e6b7 | 189 | _lock_tx_hashtbl_bh(bond); |
0d206a3a MW |
190 | |
191 | bond_info->tx_hashtbl = new_hashtbl; | |
1da177e4 | 192 | |
1da177e4 | 193 | for (i = 0; i < TLB_HASH_TABLE_SIZE; i++) { |
38dbaf0a | 194 | tlb_init_table_entry(&bond_info->tx_hashtbl[i], 0); |
1da177e4 LT |
195 | } |
196 | ||
f515e6b7 | 197 | _unlock_tx_hashtbl_bh(bond); |
1da177e4 LT |
198 | |
199 | return 0; | |
200 | } | |
201 | ||
202 | /* Must be called only after all slaves have been released */ | |
203 | static void tlb_deinitialize(struct bonding *bond) | |
204 | { | |
205 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
206 | ||
f515e6b7 | 207 | _lock_tx_hashtbl_bh(bond); |
1da177e4 LT |
208 | |
209 | kfree(bond_info->tx_hashtbl); | |
210 | bond_info->tx_hashtbl = NULL; | |
211 | ||
f515e6b7 | 212 | _unlock_tx_hashtbl_bh(bond); |
1da177e4 LT |
213 | } |
214 | ||
097811bb JP |
215 | static long long compute_gap(struct slave *slave) |
216 | { | |
217 | return (s64) (slave->speed << 20) - /* Convert to Megabit per sec */ | |
218 | (s64) (SLAVE_TLB_INFO(slave).load << 3); /* Bytes to bits */ | |
219 | } | |
220 | ||
1da177e4 LT |
221 | /* Caller must hold bond lock for read */ |
222 | static struct slave *tlb_get_least_loaded_slave(struct bonding *bond) | |
223 | { | |
224 | struct slave *slave, *least_loaded; | |
9caff1e7 | 225 | struct list_head *iter; |
097811bb | 226 | long long max_gap; |
1da177e4 | 227 | |
097811bb JP |
228 | least_loaded = NULL; |
229 | max_gap = LLONG_MIN; | |
1da177e4 LT |
230 | |
231 | /* Find the slave with the largest gap */ | |
28c71926 | 232 | bond_for_each_slave_rcu(bond, slave, iter) { |
1da177e4 | 233 | if (SLAVE_IS_OK(slave)) { |
097811bb JP |
234 | long long gap = compute_gap(slave); |
235 | ||
1da177e4 LT |
236 | if (max_gap < gap) { |
237 | least_loaded = slave; | |
238 | max_gap = gap; | |
239 | } | |
240 | } | |
241 | } | |
242 | ||
243 | return least_loaded; | |
244 | } | |
245 | ||
f515e6b7 MU |
246 | static struct slave *__tlb_choose_channel(struct bonding *bond, u32 hash_index, |
247 | u32 skb_len) | |
1da177e4 LT |
248 | { |
249 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
250 | struct tlb_client_info *hash_table; | |
251 | struct slave *assigned_slave; | |
252 | ||
1da177e4 LT |
253 | hash_table = bond_info->tx_hashtbl; |
254 | assigned_slave = hash_table[hash_index].tx_slave; | |
255 | if (!assigned_slave) { | |
256 | assigned_slave = tlb_get_least_loaded_slave(bond); | |
257 | ||
258 | if (assigned_slave) { | |
259 | struct tlb_slave_info *slave_info = | |
260 | &(SLAVE_TLB_INFO(assigned_slave)); | |
261 | u32 next_index = slave_info->head; | |
262 | ||
263 | hash_table[hash_index].tx_slave = assigned_slave; | |
264 | hash_table[hash_index].next = next_index; | |
265 | hash_table[hash_index].prev = TLB_NULL_INDEX; | |
266 | ||
267 | if (next_index != TLB_NULL_INDEX) { | |
268 | hash_table[next_index].prev = hash_index; | |
269 | } | |
270 | ||
271 | slave_info->head = hash_index; | |
272 | slave_info->load += | |
273 | hash_table[hash_index].load_history; | |
274 | } | |
275 | } | |
276 | ||
277 | if (assigned_slave) { | |
278 | hash_table[hash_index].tx_bytes += skb_len; | |
279 | } | |
280 | ||
1da177e4 LT |
281 | return assigned_slave; |
282 | } | |
283 | ||
f515e6b7 MU |
284 | /* Caller must hold bond lock for read */ |
285 | static struct slave *tlb_choose_channel(struct bonding *bond, u32 hash_index, | |
286 | u32 skb_len) | |
287 | { | |
288 | struct slave *tx_slave; | |
289 | /* | |
290 | * We don't need to disable softirq here, becase | |
291 | * tlb_choose_channel() is only called by bond_alb_xmit() | |
292 | * which already has softirq disabled. | |
293 | */ | |
294 | _lock_tx_hashtbl(bond); | |
295 | tx_slave = __tlb_choose_channel(bond, hash_index, skb_len); | |
296 | _unlock_tx_hashtbl(bond); | |
297 | return tx_slave; | |
298 | } | |
299 | ||
1da177e4 | 300 | /*********************** rlb specific functions ***************************/ |
f515e6b7 | 301 | static inline void _lock_rx_hashtbl_bh(struct bonding *bond) |
1da177e4 | 302 | { |
6603a6f2 | 303 | spin_lock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock)); |
1da177e4 LT |
304 | } |
305 | ||
f515e6b7 | 306 | static inline void _unlock_rx_hashtbl_bh(struct bonding *bond) |
1da177e4 | 307 | { |
6603a6f2 | 308 | spin_unlock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock)); |
1da177e4 LT |
309 | } |
310 | ||
f515e6b7 MU |
311 | static inline void _lock_rx_hashtbl(struct bonding *bond) |
312 | { | |
313 | spin_lock(&(BOND_ALB_INFO(bond).rx_hashtbl_lock)); | |
314 | } | |
315 | ||
316 | static inline void _unlock_rx_hashtbl(struct bonding *bond) | |
317 | { | |
318 | spin_unlock(&(BOND_ALB_INFO(bond).rx_hashtbl_lock)); | |
319 | } | |
320 | ||
1da177e4 LT |
321 | /* when an ARP REPLY is received from a client update its info |
322 | * in the rx_hashtbl | |
323 | */ | |
324 | static void rlb_update_entry_from_arp(struct bonding *bond, struct arp_pkt *arp) | |
325 | { | |
326 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
327 | struct rlb_client_info *client_info; | |
328 | u32 hash_index; | |
329 | ||
f515e6b7 | 330 | _lock_rx_hashtbl_bh(bond); |
1da177e4 LT |
331 | |
332 | hash_index = _simple_hash((u8*)&(arp->ip_src), sizeof(arp->ip_src)); | |
333 | client_info = &(bond_info->rx_hashtbl[hash_index]); | |
334 | ||
335 | if ((client_info->assigned) && | |
336 | (client_info->ip_src == arp->ip_dst) && | |
42d782ac | 337 | (client_info->ip_dst == arp->ip_src) && |
a6700db1 | 338 | (!ether_addr_equal_64bits(client_info->mac_dst, arp->mac_src))) { |
1da177e4 LT |
339 | /* update the clients MAC address */ |
340 | memcpy(client_info->mac_dst, arp->mac_src, ETH_ALEN); | |
341 | client_info->ntt = 1; | |
342 | bond_info->rx_ntt = 1; | |
343 | } | |
344 | ||
f515e6b7 | 345 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 LT |
346 | } |
347 | ||
de063b70 ED |
348 | static int rlb_arp_recv(const struct sk_buff *skb, struct bonding *bond, |
349 | struct slave *slave) | |
1da177e4 | 350 | { |
de063b70 | 351 | struct arp_pkt *arp, _arp; |
1da177e4 | 352 | |
3aba891d | 353 | if (skb->protocol != cpu_to_be16(ETH_P_ARP)) |
b99215cd | 354 | goto out; |
1da177e4 | 355 | |
de063b70 ED |
356 | arp = skb_header_pointer(skb, 0, sizeof(_arp), &_arp); |
357 | if (!arp) | |
b99215cd | 358 | goto out; |
1da177e4 | 359 | |
e53665c6 JB |
360 | /* We received an ARP from arp->ip_src. |
361 | * We might have used this IP address previously (on the bonding host | |
362 | * itself or on a system that is bridged together with the bond). | |
363 | * However, if arp->mac_src is different than what is stored in | |
364 | * rx_hashtbl, some other host is now using the IP and we must prevent | |
365 | * sending out client updates with this IP address and the old MAC | |
366 | * address. | |
367 | * Clean up all hash table entries that have this address as ip_src but | |
368 | * have a different mac_src. | |
369 | */ | |
370 | rlb_purge_src_ip(bond, arp); | |
371 | ||
1da177e4 LT |
372 | if (arp->op_code == htons(ARPOP_REPLY)) { |
373 | /* update rx hash table for this ARP */ | |
374 | rlb_update_entry_from_arp(bond, arp); | |
5a03cdb7 | 375 | pr_debug("Server received an ARP Reply from client\n"); |
1da177e4 | 376 | } |
b99215cd DM |
377 | out: |
378 | return RX_HANDLER_ANOTHER; | |
1da177e4 LT |
379 | } |
380 | ||
381 | /* Caller must hold bond lock for read */ | |
382 | static struct slave *rlb_next_rx_slave(struct bonding *bond) | |
383 | { | |
384 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
6475ae4c VF |
385 | struct slave *before = NULL, *rx_slave = NULL, *slave; |
386 | struct list_head *iter; | |
387 | bool found = false; | |
1da177e4 | 388 | |
6475ae4c VF |
389 | bond_for_each_slave(bond, slave, iter) { |
390 | if (!SLAVE_IS_OK(slave)) | |
391 | continue; | |
392 | if (!found) { | |
393 | if (!before || before->speed < slave->speed) | |
394 | before = slave; | |
395 | } else { | |
396 | if (!rx_slave || rx_slave->speed < slave->speed) | |
1da177e4 | 397 | rx_slave = slave; |
1da177e4 | 398 | } |
6475ae4c VF |
399 | if (slave == bond_info->rx_slave) |
400 | found = true; | |
1da177e4 | 401 | } |
6475ae4c VF |
402 | /* we didn't find anything after the current or we have something |
403 | * better before and up to the current slave | |
404 | */ | |
405 | if (!rx_slave || (before && rx_slave->speed < before->speed)) | |
406 | rx_slave = before; | |
1da177e4 | 407 | |
6475ae4c VF |
408 | if (rx_slave) |
409 | bond_info->rx_slave = rx_slave; | |
1da177e4 LT |
410 | |
411 | return rx_slave; | |
412 | } | |
413 | ||
28c71926 | 414 | /* Caller must hold rcu_read_lock() for read */ |
415 | static struct slave *__rlb_next_rx_slave(struct bonding *bond) | |
416 | { | |
417 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
418 | struct slave *before = NULL, *rx_slave = NULL, *slave; | |
419 | struct list_head *iter; | |
420 | bool found = false; | |
421 | ||
422 | bond_for_each_slave_rcu(bond, slave, iter) { | |
423 | if (!SLAVE_IS_OK(slave)) | |
424 | continue; | |
425 | if (!found) { | |
426 | if (!before || before->speed < slave->speed) | |
427 | before = slave; | |
428 | } else { | |
429 | if (!rx_slave || rx_slave->speed < slave->speed) | |
430 | rx_slave = slave; | |
431 | } | |
432 | if (slave == bond_info->rx_slave) | |
433 | found = true; | |
434 | } | |
435 | /* we didn't find anything after the current or we have something | |
436 | * better before and up to the current slave | |
437 | */ | |
438 | if (!rx_slave || (before && rx_slave->speed < before->speed)) | |
439 | rx_slave = before; | |
440 | ||
441 | if (rx_slave) | |
442 | bond_info->rx_slave = rx_slave; | |
443 | ||
444 | return rx_slave; | |
445 | } | |
446 | ||
1da177e4 LT |
447 | /* teach the switch the mac of a disabled slave |
448 | * on the primary for fault tolerance | |
449 | * | |
450 | * Caller must hold bond->curr_slave_lock for write or bond lock for write | |
451 | */ | |
452 | static void rlb_teach_disabled_mac_on_primary(struct bonding *bond, u8 addr[]) | |
453 | { | |
454 | if (!bond->curr_active_slave) { | |
455 | return; | |
456 | } | |
457 | ||
458 | if (!bond->alb_info.primary_is_promisc) { | |
7e1a1ac1 WC |
459 | if (!dev_set_promiscuity(bond->curr_active_slave->dev, 1)) |
460 | bond->alb_info.primary_is_promisc = 1; | |
461 | else | |
462 | bond->alb_info.primary_is_promisc = 0; | |
1da177e4 LT |
463 | } |
464 | ||
465 | bond->alb_info.rlb_promisc_timeout_counter = 0; | |
466 | ||
467 | alb_send_learning_packets(bond->curr_active_slave, addr); | |
468 | } | |
469 | ||
470 | /* slave being removed should not be active at this point | |
471 | * | |
b2e7aceb | 472 | * Caller must hold rtnl. |
1da177e4 LT |
473 | */ |
474 | static void rlb_clear_slave(struct bonding *bond, struct slave *slave) | |
475 | { | |
476 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
477 | struct rlb_client_info *rx_hash_table; | |
478 | u32 index, next_index; | |
479 | ||
480 | /* clear slave from rx_hashtbl */ | |
f515e6b7 | 481 | _lock_rx_hashtbl_bh(bond); |
1da177e4 LT |
482 | |
483 | rx_hash_table = bond_info->rx_hashtbl; | |
e53665c6 | 484 | index = bond_info->rx_hashtbl_used_head; |
1da177e4 | 485 | for (; index != RLB_NULL_INDEX; index = next_index) { |
e53665c6 | 486 | next_index = rx_hash_table[index].used_next; |
1da177e4 LT |
487 | if (rx_hash_table[index].slave == slave) { |
488 | struct slave *assigned_slave = rlb_next_rx_slave(bond); | |
489 | ||
490 | if (assigned_slave) { | |
491 | rx_hash_table[index].slave = assigned_slave; | |
a6700db1 JP |
492 | if (!ether_addr_equal_64bits(rx_hash_table[index].mac_dst, |
493 | mac_bcast)) { | |
1da177e4 LT |
494 | bond_info->rx_hashtbl[index].ntt = 1; |
495 | bond_info->rx_ntt = 1; | |
496 | /* A slave has been removed from the | |
497 | * table because it is either disabled | |
498 | * or being released. We must retry the | |
499 | * update to avoid clients from not | |
500 | * being updated & disconnecting when | |
501 | * there is stress | |
502 | */ | |
503 | bond_info->rlb_update_retry_counter = | |
504 | RLB_UPDATE_RETRY; | |
505 | } | |
506 | } else { /* there is no active slave */ | |
507 | rx_hash_table[index].slave = NULL; | |
508 | } | |
509 | } | |
510 | } | |
511 | ||
f515e6b7 | 512 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 | 513 | |
6603a6f2 | 514 | write_lock_bh(&bond->curr_slave_lock); |
1da177e4 LT |
515 | |
516 | if (slave != bond->curr_active_slave) { | |
517 | rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr); | |
518 | } | |
519 | ||
6603a6f2 | 520 | write_unlock_bh(&bond->curr_slave_lock); |
1da177e4 LT |
521 | } |
522 | ||
523 | static void rlb_update_client(struct rlb_client_info *client_info) | |
524 | { | |
525 | int i; | |
526 | ||
527 | if (!client_info->slave) { | |
528 | return; | |
529 | } | |
530 | ||
531 | for (i = 0; i < RLB_ARP_BURST_SIZE; i++) { | |
532 | struct sk_buff *skb; | |
533 | ||
534 | skb = arp_create(ARPOP_REPLY, ETH_P_ARP, | |
535 | client_info->ip_dst, | |
536 | client_info->slave->dev, | |
537 | client_info->ip_src, | |
538 | client_info->mac_dst, | |
539 | client_info->slave->dev->dev_addr, | |
540 | client_info->mac_dst); | |
541 | if (!skb) { | |
a4aee5c8 | 542 | pr_err("%s: Error: failed to create an ARP packet\n", |
471cb5a3 | 543 | client_info->slave->bond->dev->name); |
1da177e4 LT |
544 | continue; |
545 | } | |
546 | ||
547 | skb->dev = client_info->slave->dev; | |
548 | ||
d3ab3ffd | 549 | if (client_info->vlan_id) { |
86a9bad3 | 550 | skb = vlan_put_tag(skb, htons(ETH_P_8021Q), client_info->vlan_id); |
1da177e4 | 551 | if (!skb) { |
a4aee5c8 | 552 | pr_err("%s: Error: failed to insert VLAN tag\n", |
471cb5a3 | 553 | client_info->slave->bond->dev->name); |
1da177e4 LT |
554 | continue; |
555 | } | |
556 | } | |
557 | ||
558 | arp_xmit(skb); | |
559 | } | |
560 | } | |
561 | ||
562 | /* sends ARP REPLIES that update the clients that need updating */ | |
563 | static void rlb_update_rx_clients(struct bonding *bond) | |
564 | { | |
565 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
566 | struct rlb_client_info *client_info; | |
567 | u32 hash_index; | |
568 | ||
f515e6b7 | 569 | _lock_rx_hashtbl_bh(bond); |
1da177e4 | 570 | |
e53665c6 JB |
571 | hash_index = bond_info->rx_hashtbl_used_head; |
572 | for (; hash_index != RLB_NULL_INDEX; | |
573 | hash_index = client_info->used_next) { | |
1da177e4 LT |
574 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
575 | if (client_info->ntt) { | |
576 | rlb_update_client(client_info); | |
577 | if (bond_info->rlb_update_retry_counter == 0) { | |
578 | client_info->ntt = 0; | |
579 | } | |
580 | } | |
581 | } | |
582 | ||
94e2bd68 | 583 | /* do not update the entries again until this counter is zero so that |
1da177e4 LT |
584 | * not to confuse the clients. |
585 | */ | |
586 | bond_info->rlb_update_delay_counter = RLB_UPDATE_DELAY; | |
587 | ||
f515e6b7 | 588 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 LT |
589 | } |
590 | ||
591 | /* The slave was assigned a new mac address - update the clients */ | |
592 | static void rlb_req_update_slave_clients(struct bonding *bond, struct slave *slave) | |
593 | { | |
594 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
595 | struct rlb_client_info *client_info; | |
596 | int ntt = 0; | |
597 | u32 hash_index; | |
598 | ||
f515e6b7 | 599 | _lock_rx_hashtbl_bh(bond); |
1da177e4 | 600 | |
e53665c6 JB |
601 | hash_index = bond_info->rx_hashtbl_used_head; |
602 | for (; hash_index != RLB_NULL_INDEX; | |
603 | hash_index = client_info->used_next) { | |
1da177e4 LT |
604 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
605 | ||
606 | if ((client_info->slave == slave) && | |
a6700db1 | 607 | !ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) { |
1da177e4 LT |
608 | client_info->ntt = 1; |
609 | ntt = 1; | |
610 | } | |
611 | } | |
612 | ||
613 | // update the team's flag only after the whole iteration | |
614 | if (ntt) { | |
615 | bond_info->rx_ntt = 1; | |
616 | //fasten the change | |
617 | bond_info->rlb_update_retry_counter = RLB_UPDATE_RETRY; | |
618 | } | |
619 | ||
f515e6b7 | 620 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 LT |
621 | } |
622 | ||
623 | /* mark all clients using src_ip to be updated */ | |
d3bb52b0 | 624 | static void rlb_req_update_subnet_clients(struct bonding *bond, __be32 src_ip) |
1da177e4 LT |
625 | { |
626 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
627 | struct rlb_client_info *client_info; | |
628 | u32 hash_index; | |
629 | ||
630 | _lock_rx_hashtbl(bond); | |
631 | ||
e53665c6 JB |
632 | hash_index = bond_info->rx_hashtbl_used_head; |
633 | for (; hash_index != RLB_NULL_INDEX; | |
634 | hash_index = client_info->used_next) { | |
1da177e4 LT |
635 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
636 | ||
637 | if (!client_info->slave) { | |
a4aee5c8 | 638 | pr_err("%s: Error: found a client with no channel in the client's hash table\n", |
4e0952c7 | 639 | bond->dev->name); |
1da177e4 LT |
640 | continue; |
641 | } | |
642 | /*update all clients using this src_ip, that are not assigned | |
643 | * to the team's address (curr_active_slave) and have a known | |
644 | * unicast mac address. | |
645 | */ | |
646 | if ((client_info->ip_src == src_ip) && | |
a6700db1 JP |
647 | !ether_addr_equal_64bits(client_info->slave->dev->dev_addr, |
648 | bond->dev->dev_addr) && | |
649 | !ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) { | |
1da177e4 LT |
650 | client_info->ntt = 1; |
651 | bond_info->rx_ntt = 1; | |
652 | } | |
653 | } | |
654 | ||
655 | _unlock_rx_hashtbl(bond); | |
656 | } | |
657 | ||
658 | /* Caller must hold both bond and ptr locks for read */ | |
659 | static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bond) | |
660 | { | |
661 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
a16aeb36 | 662 | struct arp_pkt *arp = arp_pkt(skb); |
28c71926 | 663 | struct slave *assigned_slave, *curr_active_slave; |
1da177e4 LT |
664 | struct rlb_client_info *client_info; |
665 | u32 hash_index = 0; | |
666 | ||
667 | _lock_rx_hashtbl(bond); | |
668 | ||
28c71926 | 669 | curr_active_slave = rcu_dereference(bond->curr_active_slave); |
670 | ||
e364a341 | 671 | hash_index = _simple_hash((u8 *)&arp->ip_dst, sizeof(arp->ip_dst)); |
1da177e4 LT |
672 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
673 | ||
674 | if (client_info->assigned) { | |
675 | if ((client_info->ip_src == arp->ip_src) && | |
676 | (client_info->ip_dst == arp->ip_dst)) { | |
677 | /* the entry is already assigned to this client */ | |
a6700db1 | 678 | if (!ether_addr_equal_64bits(arp->mac_dst, mac_bcast)) { |
1da177e4 LT |
679 | /* update mac address from arp */ |
680 | memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN); | |
681 | } | |
e53665c6 | 682 | memcpy(client_info->mac_src, arp->mac_src, ETH_ALEN); |
1da177e4 LT |
683 | |
684 | assigned_slave = client_info->slave; | |
685 | if (assigned_slave) { | |
686 | _unlock_rx_hashtbl(bond); | |
687 | return assigned_slave; | |
688 | } | |
689 | } else { | |
690 | /* the entry is already assigned to some other client, | |
691 | * move the old client to primary (curr_active_slave) so | |
692 | * that the new client can be assigned to this entry. | |
693 | */ | |
694 | if (bond->curr_active_slave && | |
28c71926 | 695 | client_info->slave != curr_active_slave) { |
696 | client_info->slave = curr_active_slave; | |
1da177e4 LT |
697 | rlb_update_client(client_info); |
698 | } | |
699 | } | |
700 | } | |
701 | /* assign a new slave */ | |
28c71926 | 702 | assigned_slave = __rlb_next_rx_slave(bond); |
1da177e4 LT |
703 | |
704 | if (assigned_slave) { | |
e53665c6 JB |
705 | if (!(client_info->assigned && |
706 | client_info->ip_src == arp->ip_src)) { | |
707 | /* ip_src is going to be updated, | |
708 | * fix the src hash list | |
709 | */ | |
710 | u32 hash_src = _simple_hash((u8 *)&arp->ip_src, | |
711 | sizeof(arp->ip_src)); | |
712 | rlb_src_unlink(bond, hash_index); | |
713 | rlb_src_link(bond, hash_src, hash_index); | |
714 | } | |
715 | ||
1da177e4 LT |
716 | client_info->ip_src = arp->ip_src; |
717 | client_info->ip_dst = arp->ip_dst; | |
718 | /* arp->mac_dst is broadcast for arp reqeusts. | |
719 | * will be updated with clients actual unicast mac address | |
720 | * upon receiving an arp reply. | |
721 | */ | |
722 | memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN); | |
e53665c6 | 723 | memcpy(client_info->mac_src, arp->mac_src, ETH_ALEN); |
1da177e4 LT |
724 | client_info->slave = assigned_slave; |
725 | ||
a6700db1 | 726 | if (!ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) { |
1da177e4 LT |
727 | client_info->ntt = 1; |
728 | bond->alb_info.rx_ntt = 1; | |
729 | } else { | |
730 | client_info->ntt = 0; | |
731 | } | |
732 | ||
6f477d42 | 733 | if (!vlan_get_tag(skb, &client_info->vlan_id)) |
d3ab3ffd | 734 | client_info->vlan_id = 0; |
1da177e4 LT |
735 | |
736 | if (!client_info->assigned) { | |
e53665c6 JB |
737 | u32 prev_tbl_head = bond_info->rx_hashtbl_used_head; |
738 | bond_info->rx_hashtbl_used_head = hash_index; | |
739 | client_info->used_next = prev_tbl_head; | |
1da177e4 | 740 | if (prev_tbl_head != RLB_NULL_INDEX) { |
e53665c6 | 741 | bond_info->rx_hashtbl[prev_tbl_head].used_prev = |
1da177e4 LT |
742 | hash_index; |
743 | } | |
744 | client_info->assigned = 1; | |
745 | } | |
746 | } | |
747 | ||
748 | _unlock_rx_hashtbl(bond); | |
749 | ||
750 | return assigned_slave; | |
751 | } | |
752 | ||
753 | /* chooses (and returns) transmit channel for arp reply | |
754 | * does not choose channel for other arp types since they are | |
755 | * sent on the curr_active_slave | |
756 | */ | |
757 | static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond) | |
758 | { | |
a16aeb36 | 759 | struct arp_pkt *arp = arp_pkt(skb); |
1da177e4 LT |
760 | struct slave *tx_slave = NULL; |
761 | ||
567b871e | 762 | /* Don't modify or load balance ARPs that do not originate locally |
763 | * (e.g.,arrive via a bridge). | |
764 | */ | |
28c71926 | 765 | if (!bond_slave_has_mac_rcu(bond, arp->mac_src)) |
567b871e | 766 | return NULL; |
767 | ||
f14c4e4e | 768 | if (arp->op_code == htons(ARPOP_REPLY)) { |
1da177e4 LT |
769 | /* the arp must be sent on the selected |
770 | * rx channel | |
771 | */ | |
772 | tx_slave = rlb_choose_channel(skb, bond); | |
773 | if (tx_slave) { | |
774 | memcpy(arp->mac_src,tx_slave->dev->dev_addr, ETH_ALEN); | |
775 | } | |
5a03cdb7 | 776 | pr_debug("Server sent ARP Reply packet\n"); |
f14c4e4e | 777 | } else if (arp->op_code == htons(ARPOP_REQUEST)) { |
1da177e4 LT |
778 | /* Create an entry in the rx_hashtbl for this client as a |
779 | * place holder. | |
780 | * When the arp reply is received the entry will be updated | |
781 | * with the correct unicast address of the client. | |
782 | */ | |
783 | rlb_choose_channel(skb, bond); | |
784 | ||
77c8e2c0 | 785 | /* The ARP reply packets must be delayed so that |
1da177e4 LT |
786 | * they can cancel out the influence of the ARP request. |
787 | */ | |
788 | bond->alb_info.rlb_update_delay_counter = RLB_UPDATE_DELAY; | |
789 | ||
790 | /* arp requests are broadcast and are sent on the primary | |
791 | * the arp request will collapse all clients on the subnet to | |
792 | * the primary slave. We must register these clients to be | |
793 | * updated with their assigned mac. | |
794 | */ | |
795 | rlb_req_update_subnet_clients(bond, arp->ip_src); | |
5a03cdb7 | 796 | pr_debug("Server sent ARP Request packet\n"); |
1da177e4 LT |
797 | } |
798 | ||
799 | return tx_slave; | |
800 | } | |
801 | ||
802 | /* Caller must hold bond lock for read */ | |
803 | static void rlb_rebalance(struct bonding *bond) | |
804 | { | |
805 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
806 | struct slave *assigned_slave; | |
807 | struct rlb_client_info *client_info; | |
808 | int ntt; | |
809 | u32 hash_index; | |
810 | ||
f515e6b7 | 811 | _lock_rx_hashtbl_bh(bond); |
1da177e4 LT |
812 | |
813 | ntt = 0; | |
e53665c6 JB |
814 | hash_index = bond_info->rx_hashtbl_used_head; |
815 | for (; hash_index != RLB_NULL_INDEX; | |
816 | hash_index = client_info->used_next) { | |
1da177e4 | 817 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
733ab639 | 818 | assigned_slave = __rlb_next_rx_slave(bond); |
1da177e4 LT |
819 | if (assigned_slave && (client_info->slave != assigned_slave)) { |
820 | client_info->slave = assigned_slave; | |
821 | client_info->ntt = 1; | |
822 | ntt = 1; | |
823 | } | |
824 | } | |
825 | ||
826 | /* update the team's flag only after the whole iteration */ | |
827 | if (ntt) { | |
828 | bond_info->rx_ntt = 1; | |
829 | } | |
f515e6b7 | 830 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 LT |
831 | } |
832 | ||
833 | /* Caller must hold rx_hashtbl lock */ | |
e53665c6 JB |
834 | static void rlb_init_table_entry_dst(struct rlb_client_info *entry) |
835 | { | |
836 | entry->used_next = RLB_NULL_INDEX; | |
837 | entry->used_prev = RLB_NULL_INDEX; | |
838 | entry->assigned = 0; | |
839 | entry->slave = NULL; | |
d3ab3ffd | 840 | entry->vlan_id = 0; |
e53665c6 JB |
841 | } |
842 | static void rlb_init_table_entry_src(struct rlb_client_info *entry) | |
843 | { | |
844 | entry->src_first = RLB_NULL_INDEX; | |
845 | entry->src_prev = RLB_NULL_INDEX; | |
846 | entry->src_next = RLB_NULL_INDEX; | |
847 | } | |
848 | ||
1da177e4 LT |
849 | static void rlb_init_table_entry(struct rlb_client_info *entry) |
850 | { | |
851 | memset(entry, 0, sizeof(struct rlb_client_info)); | |
e53665c6 JB |
852 | rlb_init_table_entry_dst(entry); |
853 | rlb_init_table_entry_src(entry); | |
854 | } | |
855 | ||
856 | static void rlb_delete_table_entry_dst(struct bonding *bond, u32 index) | |
857 | { | |
858 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
859 | u32 next_index = bond_info->rx_hashtbl[index].used_next; | |
860 | u32 prev_index = bond_info->rx_hashtbl[index].used_prev; | |
861 | ||
862 | if (index == bond_info->rx_hashtbl_used_head) | |
863 | bond_info->rx_hashtbl_used_head = next_index; | |
864 | if (prev_index != RLB_NULL_INDEX) | |
865 | bond_info->rx_hashtbl[prev_index].used_next = next_index; | |
866 | if (next_index != RLB_NULL_INDEX) | |
867 | bond_info->rx_hashtbl[next_index].used_prev = prev_index; | |
868 | } | |
869 | ||
870 | /* unlink a rlb hash table entry from the src list */ | |
871 | static void rlb_src_unlink(struct bonding *bond, u32 index) | |
872 | { | |
873 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
874 | u32 next_index = bond_info->rx_hashtbl[index].src_next; | |
875 | u32 prev_index = bond_info->rx_hashtbl[index].src_prev; | |
876 | ||
877 | bond_info->rx_hashtbl[index].src_next = RLB_NULL_INDEX; | |
878 | bond_info->rx_hashtbl[index].src_prev = RLB_NULL_INDEX; | |
879 | ||
880 | if (next_index != RLB_NULL_INDEX) | |
881 | bond_info->rx_hashtbl[next_index].src_prev = prev_index; | |
882 | ||
883 | if (prev_index == RLB_NULL_INDEX) | |
884 | return; | |
885 | ||
886 | /* is prev_index pointing to the head of this list? */ | |
887 | if (bond_info->rx_hashtbl[prev_index].src_first == index) | |
888 | bond_info->rx_hashtbl[prev_index].src_first = next_index; | |
889 | else | |
890 | bond_info->rx_hashtbl[prev_index].src_next = next_index; | |
891 | ||
892 | } | |
893 | ||
894 | static void rlb_delete_table_entry(struct bonding *bond, u32 index) | |
895 | { | |
896 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
897 | struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]); | |
898 | ||
899 | rlb_delete_table_entry_dst(bond, index); | |
900 | rlb_init_table_entry_dst(entry); | |
901 | ||
902 | rlb_src_unlink(bond, index); | |
903 | } | |
904 | ||
905 | /* add the rx_hashtbl[ip_dst_hash] entry to the list | |
906 | * of entries with identical ip_src_hash | |
907 | */ | |
908 | static void rlb_src_link(struct bonding *bond, u32 ip_src_hash, u32 ip_dst_hash) | |
909 | { | |
910 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
911 | u32 next; | |
912 | ||
913 | bond_info->rx_hashtbl[ip_dst_hash].src_prev = ip_src_hash; | |
914 | next = bond_info->rx_hashtbl[ip_src_hash].src_first; | |
915 | bond_info->rx_hashtbl[ip_dst_hash].src_next = next; | |
916 | if (next != RLB_NULL_INDEX) | |
917 | bond_info->rx_hashtbl[next].src_prev = ip_dst_hash; | |
918 | bond_info->rx_hashtbl[ip_src_hash].src_first = ip_dst_hash; | |
919 | } | |
920 | ||
921 | /* deletes all rx_hashtbl entries with arp->ip_src if their mac_src does | |
922 | * not match arp->mac_src */ | |
923 | static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp) | |
924 | { | |
925 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
926 | u32 ip_src_hash = _simple_hash((u8*)&(arp->ip_src), sizeof(arp->ip_src)); | |
927 | u32 index; | |
928 | ||
929 | _lock_rx_hashtbl_bh(bond); | |
930 | ||
931 | index = bond_info->rx_hashtbl[ip_src_hash].src_first; | |
932 | while (index != RLB_NULL_INDEX) { | |
933 | struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]); | |
934 | u32 next_index = entry->src_next; | |
935 | if (entry->ip_src == arp->ip_src && | |
936 | !ether_addr_equal_64bits(arp->mac_src, entry->mac_src)) | |
937 | rlb_delete_table_entry(bond, index); | |
938 | index = next_index; | |
939 | } | |
940 | _unlock_rx_hashtbl_bh(bond); | |
1da177e4 LT |
941 | } |
942 | ||
943 | static int rlb_initialize(struct bonding *bond) | |
944 | { | |
945 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
0d206a3a | 946 | struct rlb_client_info *new_hashtbl; |
1da177e4 LT |
947 | int size = RLB_HASH_TABLE_SIZE * sizeof(struct rlb_client_info); |
948 | int i; | |
949 | ||
0d206a3a | 950 | new_hashtbl = kmalloc(size, GFP_KERNEL); |
e404decb | 951 | if (!new_hashtbl) |
1da177e4 | 952 | return -1; |
e404decb | 953 | |
f515e6b7 | 954 | _lock_rx_hashtbl_bh(bond); |
0d206a3a MW |
955 | |
956 | bond_info->rx_hashtbl = new_hashtbl; | |
1da177e4 | 957 | |
e53665c6 | 958 | bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX; |
1da177e4 LT |
959 | |
960 | for (i = 0; i < RLB_HASH_TABLE_SIZE; i++) { | |
961 | rlb_init_table_entry(bond_info->rx_hashtbl + i); | |
962 | } | |
963 | ||
f515e6b7 | 964 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 | 965 | |
1da177e4 | 966 | /* register to receive ARPs */ |
3aba891d | 967 | bond->recv_probe = rlb_arp_recv; |
1da177e4 LT |
968 | |
969 | return 0; | |
970 | } | |
971 | ||
972 | static void rlb_deinitialize(struct bonding *bond) | |
973 | { | |
974 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
975 | ||
f515e6b7 | 976 | _lock_rx_hashtbl_bh(bond); |
1da177e4 LT |
977 | |
978 | kfree(bond_info->rx_hashtbl); | |
979 | bond_info->rx_hashtbl = NULL; | |
e53665c6 | 980 | bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX; |
1da177e4 | 981 | |
f515e6b7 | 982 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 LT |
983 | } |
984 | ||
985 | static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id) | |
986 | { | |
987 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
988 | u32 curr_index; | |
989 | ||
f515e6b7 | 990 | _lock_rx_hashtbl_bh(bond); |
1da177e4 | 991 | |
e53665c6 | 992 | curr_index = bond_info->rx_hashtbl_used_head; |
1da177e4 LT |
993 | while (curr_index != RLB_NULL_INDEX) { |
994 | struct rlb_client_info *curr = &(bond_info->rx_hashtbl[curr_index]); | |
e53665c6 | 995 | u32 next_index = bond_info->rx_hashtbl[curr_index].used_next; |
1da177e4 | 996 | |
d3ab3ffd | 997 | if (curr->vlan_id == vlan_id) |
e53665c6 | 998 | rlb_delete_table_entry(bond, curr_index); |
1da177e4 LT |
999 | |
1000 | curr_index = next_index; | |
1001 | } | |
1002 | ||
f515e6b7 | 1003 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 LT |
1004 | } |
1005 | ||
1006 | /*********************** tlb/rlb shared functions *********************/ | |
1007 | ||
7aa64981 VF |
1008 | static void alb_send_lp_vid(struct slave *slave, u8 mac_addr[], |
1009 | u16 vid) | |
1da177e4 | 1010 | { |
1da177e4 | 1011 | struct learning_pkt pkt; |
7aa64981 | 1012 | struct sk_buff *skb; |
1da177e4 | 1013 | int size = sizeof(struct learning_pkt); |
7aa64981 | 1014 | char *data; |
1da177e4 LT |
1015 | |
1016 | memset(&pkt, 0, size); | |
1017 | memcpy(pkt.mac_dst, mac_addr, ETH_ALEN); | |
1018 | memcpy(pkt.mac_src, mac_addr, ETH_ALEN); | |
09640e63 | 1019 | pkt.type = cpu_to_be16(ETH_P_LOOP); |
1da177e4 | 1020 | |
7aa64981 VF |
1021 | skb = dev_alloc_skb(size); |
1022 | if (!skb) | |
1023 | return; | |
1da177e4 | 1024 | |
7aa64981 VF |
1025 | data = skb_put(skb, size); |
1026 | memcpy(data, &pkt, size); | |
1027 | ||
1028 | skb_reset_mac_header(skb); | |
1029 | skb->network_header = skb->mac_header + ETH_HLEN; | |
1030 | skb->protocol = pkt.type; | |
1031 | skb->priority = TC_PRIO_CONTROL; | |
1032 | skb->dev = slave->dev; | |
1033 | ||
1034 | if (vid) { | |
1035 | skb = vlan_put_tag(skb, htons(ETH_P_8021Q), vid); | |
1da177e4 | 1036 | if (!skb) { |
7aa64981 VF |
1037 | pr_err("%s: Error: failed to insert VLAN tag\n", |
1038 | slave->bond->dev->name); | |
1da177e4 LT |
1039 | return; |
1040 | } | |
7aa64981 VF |
1041 | } |
1042 | ||
1043 | dev_queue_xmit(skb); | |
1044 | } | |
1da177e4 | 1045 | |
1da177e4 | 1046 | |
7aa64981 VF |
1047 | static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[]) |
1048 | { | |
1049 | struct bonding *bond = bond_get_bond_by_slave(slave); | |
5bf94b83 VF |
1050 | struct net_device *upper; |
1051 | struct list_head *iter; | |
1052 | ||
1053 | /* send untagged */ | |
1054 | alb_send_lp_vid(slave, mac_addr, 0); | |
1055 | ||
1056 | /* loop through vlans and send one packet for each */ | |
1057 | rcu_read_lock(); | |
2f268f12 | 1058 | netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) { |
5bf94b83 VF |
1059 | if (upper->priv_flags & IFF_802_1Q_VLAN) |
1060 | alb_send_lp_vid(slave, mac_addr, | |
1061 | vlan_dev_vlan_id(upper)); | |
1da177e4 | 1062 | } |
5bf94b83 | 1063 | rcu_read_unlock(); |
1da177e4 LT |
1064 | } |
1065 | ||
b924551b | 1066 | static int alb_set_slave_mac_addr(struct slave *slave, u8 addr[]) |
1da177e4 LT |
1067 | { |
1068 | struct net_device *dev = slave->dev; | |
1069 | struct sockaddr s_addr; | |
1070 | ||
b924551b | 1071 | if (slave->bond->params.mode == BOND_MODE_TLB) { |
1da177e4 LT |
1072 | memcpy(dev->dev_addr, addr, dev->addr_len); |
1073 | return 0; | |
1074 | } | |
1075 | ||
1076 | /* for rlb each slave must have a unique hw mac addresses so that */ | |
1077 | /* each slave will receive packets destined to a different mac */ | |
1078 | memcpy(s_addr.sa_data, addr, dev->addr_len); | |
1079 | s_addr.sa_family = dev->type; | |
1080 | if (dev_set_mac_address(dev, &s_addr)) { | |
a4aee5c8 JP |
1081 | pr_err("%s: Error: dev_set_mac_address of dev %s failed!\n" |
1082 | "ALB mode requires that the base driver support setting the hw address also when the network device's interface is open\n", | |
471cb5a3 | 1083 | slave->bond->dev->name, dev->name); |
1da177e4 LT |
1084 | return -EOPNOTSUPP; |
1085 | } | |
1086 | return 0; | |
1087 | } | |
1088 | ||
059fe7a5 JV |
1089 | /* |
1090 | * Swap MAC addresses between two slaves. | |
1091 | * | |
1092 | * Called with RTNL held, and no other locks. | |
1093 | * | |
1094 | */ | |
1095 | ||
43547ea6 | 1096 | static void alb_swap_mac_addr(struct slave *slave1, struct slave *slave2) |
1da177e4 | 1097 | { |
1da177e4 | 1098 | u8 tmp_mac_addr[ETH_ALEN]; |
1da177e4 LT |
1099 | |
1100 | memcpy(tmp_mac_addr, slave1->dev->dev_addr, ETH_ALEN); | |
b924551b JB |
1101 | alb_set_slave_mac_addr(slave1, slave2->dev->dev_addr); |
1102 | alb_set_slave_mac_addr(slave2, tmp_mac_addr); | |
1da177e4 | 1103 | |
059fe7a5 JV |
1104 | } |
1105 | ||
1106 | /* | |
1107 | * Send learning packets after MAC address swap. | |
1108 | * | |
2543331d | 1109 | * Called with RTNL and no other locks |
059fe7a5 JV |
1110 | */ |
1111 | static void alb_fasten_mac_swap(struct bonding *bond, struct slave *slave1, | |
1112 | struct slave *slave2) | |
1113 | { | |
1114 | int slaves_state_differ = (SLAVE_IS_OK(slave1) != SLAVE_IS_OK(slave2)); | |
1115 | struct slave *disabled_slave = NULL; | |
1116 | ||
2543331d JV |
1117 | ASSERT_RTNL(); |
1118 | ||
1da177e4 LT |
1119 | /* fasten the change in the switch */ |
1120 | if (SLAVE_IS_OK(slave1)) { | |
1121 | alb_send_learning_packets(slave1, slave1->dev->dev_addr); | |
1122 | if (bond->alb_info.rlb_enabled) { | |
1123 | /* inform the clients that the mac address | |
1124 | * has changed | |
1125 | */ | |
1126 | rlb_req_update_slave_clients(bond, slave1); | |
1127 | } | |
1128 | } else { | |
1129 | disabled_slave = slave1; | |
1130 | } | |
1131 | ||
1132 | if (SLAVE_IS_OK(slave2)) { | |
1133 | alb_send_learning_packets(slave2, slave2->dev->dev_addr); | |
1134 | if (bond->alb_info.rlb_enabled) { | |
1135 | /* inform the clients that the mac address | |
1136 | * has changed | |
1137 | */ | |
1138 | rlb_req_update_slave_clients(bond, slave2); | |
1139 | } | |
1140 | } else { | |
1141 | disabled_slave = slave2; | |
1142 | } | |
1143 | ||
1144 | if (bond->alb_info.rlb_enabled && slaves_state_differ) { | |
1145 | /* A disabled slave was assigned an active mac addr */ | |
1146 | rlb_teach_disabled_mac_on_primary(bond, | |
1147 | disabled_slave->dev->dev_addr); | |
1148 | } | |
1149 | } | |
1150 | ||
1151 | /** | |
1152 | * alb_change_hw_addr_on_detach | |
1153 | * @bond: bonding we're working on | |
1154 | * @slave: the slave that was just detached | |
1155 | * | |
1156 | * We assume that @slave was already detached from the slave list. | |
1157 | * | |
1158 | * If @slave's permanent hw address is different both from its current | |
1159 | * address and from @bond's address, then somewhere in the bond there's | |
1160 | * a slave that has @slave's permanet address as its current address. | |
1161 | * We'll make sure that that slave no longer uses @slave's permanent address. | |
1162 | * | |
2543331d | 1163 | * Caller must hold RTNL and no other locks |
1da177e4 LT |
1164 | */ |
1165 | static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *slave) | |
1166 | { | |
1167 | int perm_curr_diff; | |
1168 | int perm_bond_diff; | |
b88ec38d | 1169 | struct slave *found_slave; |
1da177e4 | 1170 | |
a6700db1 JP |
1171 | perm_curr_diff = !ether_addr_equal_64bits(slave->perm_hwaddr, |
1172 | slave->dev->dev_addr); | |
1173 | perm_bond_diff = !ether_addr_equal_64bits(slave->perm_hwaddr, | |
1174 | bond->dev->dev_addr); | |
1da177e4 LT |
1175 | |
1176 | if (perm_curr_diff && perm_bond_diff) { | |
b88ec38d | 1177 | found_slave = bond_slave_has_mac(bond, slave->perm_hwaddr); |
1da177e4 | 1178 | |
b88ec38d | 1179 | if (found_slave) { |
059fe7a5 | 1180 | /* locking: needs RTNL and nothing else */ |
b88ec38d VF |
1181 | alb_swap_mac_addr(slave, found_slave); |
1182 | alb_fasten_mac_swap(bond, slave, found_slave); | |
1da177e4 LT |
1183 | } |
1184 | } | |
1185 | } | |
1186 | ||
1187 | /** | |
1188 | * alb_handle_addr_collision_on_attach | |
1189 | * @bond: bonding we're working on | |
1190 | * @slave: the slave that was just attached | |
1191 | * | |
1192 | * checks uniqueness of slave's mac address and handles the case the | |
1193 | * new slave uses the bonds mac address. | |
1194 | * | |
1195 | * If the permanent hw address of @slave is @bond's hw address, we need to | |
1196 | * find a different hw address to give @slave, that isn't in use by any other | |
77c8e2c0 | 1197 | * slave in the bond. This address must be, of course, one of the permanent |
1da177e4 LT |
1198 | * addresses of the other slaves. |
1199 | * | |
1200 | * We go over the slave list, and for each slave there we compare its | |
1201 | * permanent hw address with the current address of all the other slaves. | |
1202 | * If no match was found, then we've found a slave with a permanent address | |
1203 | * that isn't used by any other slave in the bond, so we can assign it to | |
1204 | * @slave. | |
1205 | * | |
1206 | * assumption: this function is called before @slave is attached to the | |
cedb743f | 1207 | * bond slave list. |
1da177e4 LT |
1208 | */ |
1209 | static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slave *slave) | |
1210 | { | |
1da177e4 | 1211 | struct slave *has_bond_addr = bond->curr_active_slave; |
9caff1e7 VF |
1212 | struct slave *tmp_slave1, *free_mac_slave = NULL; |
1213 | struct list_head *iter; | |
1da177e4 | 1214 | |
0965a1f3 | 1215 | if (!bond_has_slaves(bond)) { |
1da177e4 LT |
1216 | /* this is the first slave */ |
1217 | return 0; | |
1218 | } | |
1219 | ||
1220 | /* if slave's mac address differs from bond's mac address | |
1221 | * check uniqueness of slave's mac address against the other | |
1222 | * slaves in the bond. | |
1223 | */ | |
a6700db1 | 1224 | if (!ether_addr_equal_64bits(slave->perm_hwaddr, bond->dev->dev_addr)) { |
cedb743f | 1225 | if (!bond_slave_has_mac(bond, slave->dev->dev_addr)) |
6b38aefe | 1226 | return 0; |
1da177e4 | 1227 | |
6b38aefe JL |
1228 | /* Try setting slave mac to bond address and fall-through |
1229 | to code handling that situation below... */ | |
b924551b | 1230 | alb_set_slave_mac_addr(slave, bond->dev->dev_addr); |
1da177e4 LT |
1231 | } |
1232 | ||
1233 | /* The slave's address is equal to the address of the bond. | |
1234 | * Search for a spare address in the bond for this slave. | |
1235 | */ | |
9caff1e7 | 1236 | bond_for_each_slave(bond, tmp_slave1, iter) { |
cedb743f | 1237 | if (!bond_slave_has_mac(bond, tmp_slave1->perm_hwaddr)) { |
1da177e4 LT |
1238 | /* no slave has tmp_slave1's perm addr |
1239 | * as its curr addr | |
1240 | */ | |
1241 | free_mac_slave = tmp_slave1; | |
1242 | break; | |
1243 | } | |
1244 | ||
1245 | if (!has_bond_addr) { | |
a6700db1 JP |
1246 | if (ether_addr_equal_64bits(tmp_slave1->dev->dev_addr, |
1247 | bond->dev->dev_addr)) { | |
1da177e4 LT |
1248 | |
1249 | has_bond_addr = tmp_slave1; | |
1250 | } | |
1251 | } | |
1252 | } | |
1253 | ||
1254 | if (free_mac_slave) { | |
b924551b | 1255 | alb_set_slave_mac_addr(slave, free_mac_slave->perm_hwaddr); |
1da177e4 | 1256 | |
a4aee5c8 | 1257 | 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 |
1258 | bond->dev->name, slave->dev->name, |
1259 | free_mac_slave->dev->name); | |
1da177e4 LT |
1260 | |
1261 | } else if (has_bond_addr) { | |
a4aee5c8 | 1262 | pr_err("%s: Error: the hw address of slave %s is in use by the bond; couldn't find a slave with a free hw address to give it (this should not have happened)\n", |
4e0952c7 | 1263 | bond->dev->name, slave->dev->name); |
1da177e4 LT |
1264 | return -EFAULT; |
1265 | } | |
1266 | ||
1267 | return 0; | |
1268 | } | |
1269 | ||
1270 | /** | |
1271 | * alb_set_mac_address | |
1272 | * @bond: | |
1273 | * @addr: | |
1274 | * | |
1275 | * In TLB mode all slaves are configured to the bond's hw address, but set | |
1276 | * their dev_addr field to different addresses (based on their permanent hw | |
1277 | * addresses). | |
1278 | * | |
1279 | * For each slave, this function sets the interface to the new address and then | |
1280 | * changes its dev_addr field to its previous value. | |
1281 | * | |
1282 | * Unwinding assumes bond's mac address has not yet changed. | |
1283 | */ | |
1284 | static int alb_set_mac_address(struct bonding *bond, void *addr) | |
1285 | { | |
81f23b13 | 1286 | struct slave *slave, *rollback_slave; |
9caff1e7 | 1287 | struct list_head *iter; |
dec1e90e | 1288 | struct sockaddr sa; |
81f23b13 | 1289 | char tmp_addr[ETH_ALEN]; |
1da177e4 | 1290 | int res; |
1da177e4 | 1291 | |
dec1e90e | 1292 | if (bond->alb_info.rlb_enabled) |
1da177e4 | 1293 | return 0; |
1da177e4 | 1294 | |
9caff1e7 | 1295 | bond_for_each_slave(bond, slave, iter) { |
1da177e4 LT |
1296 | /* save net_device's current hw address */ |
1297 | memcpy(tmp_addr, slave->dev->dev_addr, ETH_ALEN); | |
1298 | ||
1299 | res = dev_set_mac_address(slave->dev, addr); | |
1300 | ||
1301 | /* restore net_device's hw address */ | |
1302 | memcpy(slave->dev->dev_addr, tmp_addr, ETH_ALEN); | |
1303 | ||
eb7cc59a | 1304 | if (res) |
1da177e4 | 1305 | goto unwind; |
1da177e4 LT |
1306 | } |
1307 | ||
1308 | return 0; | |
1309 | ||
1310 | unwind: | |
1311 | memcpy(sa.sa_data, bond->dev->dev_addr, bond->dev->addr_len); | |
1312 | sa.sa_family = bond->dev->type; | |
1313 | ||
1314 | /* unwind from head to the slave that failed */ | |
9caff1e7 | 1315 | bond_for_each_slave(bond, rollback_slave, iter) { |
81f23b13 VF |
1316 | if (rollback_slave == slave) |
1317 | break; | |
1318 | memcpy(tmp_addr, rollback_slave->dev->dev_addr, ETH_ALEN); | |
1319 | dev_set_mac_address(rollback_slave->dev, &sa); | |
1320 | memcpy(rollback_slave->dev->dev_addr, tmp_addr, ETH_ALEN); | |
1da177e4 LT |
1321 | } |
1322 | ||
1323 | return res; | |
1324 | } | |
1325 | ||
1326 | /************************ exported alb funcions ************************/ | |
1327 | ||
1328 | int bond_alb_initialize(struct bonding *bond, int rlb_enabled) | |
1329 | { | |
1330 | int res; | |
1331 | ||
1332 | res = tlb_initialize(bond); | |
1333 | if (res) { | |
1334 | return res; | |
1335 | } | |
1336 | ||
1337 | if (rlb_enabled) { | |
1338 | bond->alb_info.rlb_enabled = 1; | |
1339 | /* initialize rlb */ | |
1340 | res = rlb_initialize(bond); | |
1341 | if (res) { | |
1342 | tlb_deinitialize(bond); | |
1343 | return res; | |
1344 | } | |
b76850ab MW |
1345 | } else { |
1346 | bond->alb_info.rlb_enabled = 0; | |
1da177e4 LT |
1347 | } |
1348 | ||
1349 | return 0; | |
1350 | } | |
1351 | ||
1352 | void bond_alb_deinitialize(struct bonding *bond) | |
1353 | { | |
1354 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1355 | ||
1356 | tlb_deinitialize(bond); | |
1357 | ||
1358 | if (bond_info->rlb_enabled) { | |
1359 | rlb_deinitialize(bond); | |
1360 | } | |
1361 | } | |
1362 | ||
1363 | int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev) | |
1364 | { | |
454d7c9b | 1365 | struct bonding *bond = netdev_priv(bond_dev); |
1da177e4 LT |
1366 | struct ethhdr *eth_data; |
1367 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1368 | struct slave *tx_slave = NULL; | |
d3bb52b0 | 1369 | static const __be32 ip_bcast = htonl(0xffffffff); |
1da177e4 LT |
1370 | int hash_size = 0; |
1371 | int do_tx_balance = 1; | |
1372 | u32 hash_index = 0; | |
eddc9ec5 | 1373 | const u8 *hash_start = NULL; |
2d1ea19d | 1374 | struct ipv6hdr *ip6hdr; |
1da177e4 | 1375 | |
459a98ed | 1376 | skb_reset_mac_header(skb); |
1da177e4 LT |
1377 | eth_data = eth_hdr(skb); |
1378 | ||
1da177e4 | 1379 | switch (ntohs(skb->protocol)) { |
eddc9ec5 ACM |
1380 | case ETH_P_IP: { |
1381 | const struct iphdr *iph = ip_hdr(skb); | |
1382 | ||
a6700db1 | 1383 | if (ether_addr_equal_64bits(eth_data->h_dest, mac_bcast) || |
eddc9ec5 ACM |
1384 | (iph->daddr == ip_bcast) || |
1385 | (iph->protocol == IPPROTO_IGMP)) { | |
1da177e4 LT |
1386 | do_tx_balance = 0; |
1387 | break; | |
1388 | } | |
eddc9ec5 ACM |
1389 | hash_start = (char *)&(iph->daddr); |
1390 | hash_size = sizeof(iph->daddr); | |
1391 | } | |
1da177e4 LT |
1392 | break; |
1393 | case ETH_P_IPV6: | |
2d1ea19d VY |
1394 | /* IPv6 doesn't really use broadcast mac address, but leave |
1395 | * that here just in case. | |
1396 | */ | |
a6700db1 | 1397 | if (ether_addr_equal_64bits(eth_data->h_dest, mac_bcast)) { |
1da177e4 LT |
1398 | do_tx_balance = 0; |
1399 | break; | |
2d1ea19d VY |
1400 | } |
1401 | ||
1402 | /* IPv6 uses all-nodes multicast as an equivalent to | |
1403 | * broadcasts in IPv4. | |
1404 | */ | |
a6700db1 | 1405 | if (ether_addr_equal_64bits(eth_data->h_dest, mac_v6_allmcast)) { |
2d1ea19d VY |
1406 | do_tx_balance = 0; |
1407 | break; | |
1408 | } | |
1409 | ||
1410 | /* Additianally, DAD probes should not be tx-balanced as that | |
1411 | * will lead to false positives for duplicate addresses and | |
1412 | * prevent address configuration from working. | |
1413 | */ | |
1414 | ip6hdr = ipv6_hdr(skb); | |
1415 | if (ipv6_addr_any(&ip6hdr->saddr)) { | |
1416 | do_tx_balance = 0; | |
1417 | break; | |
1da177e4 LT |
1418 | } |
1419 | ||
0660e03f ACM |
1420 | hash_start = (char *)&(ipv6_hdr(skb)->daddr); |
1421 | hash_size = sizeof(ipv6_hdr(skb)->daddr); | |
1da177e4 LT |
1422 | break; |
1423 | case ETH_P_IPX: | |
d3bb52b0 | 1424 | if (ipx_hdr(skb)->ipx_checksum != IPX_NO_CHECKSUM) { |
1da177e4 LT |
1425 | /* something is wrong with this packet */ |
1426 | do_tx_balance = 0; | |
1427 | break; | |
1428 | } | |
1429 | ||
1430 | if (ipx_hdr(skb)->ipx_type != IPX_TYPE_NCP) { | |
1431 | /* The only protocol worth balancing in | |
1432 | * this family since it has an "ARP" like | |
1433 | * mechanism | |
1434 | */ | |
1435 | do_tx_balance = 0; | |
1436 | break; | |
1437 | } | |
1438 | ||
1439 | hash_start = (char*)eth_data->h_dest; | |
1440 | hash_size = ETH_ALEN; | |
1441 | break; | |
1442 | case ETH_P_ARP: | |
1443 | do_tx_balance = 0; | |
1444 | if (bond_info->rlb_enabled) { | |
1445 | tx_slave = rlb_arp_xmit(skb, bond); | |
1446 | } | |
1447 | break; | |
1448 | default: | |
1449 | do_tx_balance = 0; | |
1450 | break; | |
1451 | } | |
1452 | ||
1453 | if (do_tx_balance) { | |
1454 | hash_index = _simple_hash(hash_start, hash_size); | |
1455 | tx_slave = tlb_choose_channel(bond, hash_index, skb->len); | |
1456 | } | |
1457 | ||
1458 | if (!tx_slave) { | |
1459 | /* unbalanced or unassigned, send through primary */ | |
28c71926 | 1460 | tx_slave = rcu_dereference(bond->curr_active_slave); |
1da177e4 LT |
1461 | bond_info->unbalanced_load += skb->len; |
1462 | } | |
1463 | ||
1464 | if (tx_slave && SLAVE_IS_OK(tx_slave)) { | |
28c71926 | 1465 | if (tx_slave != rcu_dereference(bond->curr_active_slave)) { |
1da177e4 LT |
1466 | memcpy(eth_data->h_source, |
1467 | tx_slave->dev->dev_addr, | |
1468 | ETH_ALEN); | |
1469 | } | |
1470 | ||
4d4ac1b0 | 1471 | bond_dev_queue_xmit(bond, skb, tx_slave->dev); |
1472 | goto out; | |
1da177e4 LT |
1473 | } else { |
1474 | if (tx_slave) { | |
f515e6b7 MU |
1475 | _lock_tx_hashtbl(bond); |
1476 | __tlb_clear_slave(bond, tx_slave, 0); | |
1477 | _unlock_tx_hashtbl(bond); | |
1da177e4 LT |
1478 | } |
1479 | } | |
1480 | ||
4d4ac1b0 | 1481 | /* no suitable interface, frame not sent */ |
1482 | kfree_skb(skb); | |
1483 | out: | |
ec634fe3 | 1484 | return NETDEV_TX_OK; |
1da177e4 LT |
1485 | } |
1486 | ||
1b76b316 | 1487 | void bond_alb_monitor(struct work_struct *work) |
1da177e4 | 1488 | { |
1b76b316 JV |
1489 | struct bonding *bond = container_of(work, struct bonding, |
1490 | alb_work.work); | |
1da177e4 | 1491 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
9caff1e7 | 1492 | struct list_head *iter; |
1da177e4 | 1493 | struct slave *slave; |
1da177e4 | 1494 | |
0965a1f3 | 1495 | if (!bond_has_slaves(bond)) { |
1da177e4 LT |
1496 | bond_info->tx_rebalance_counter = 0; |
1497 | bond_info->lp_counter = 0; | |
1498 | goto re_arm; | |
1499 | } | |
1500 | ||
733ab639 | 1501 | rcu_read_lock(); |
1502 | ||
1da177e4 LT |
1503 | bond_info->tx_rebalance_counter++; |
1504 | bond_info->lp_counter++; | |
1505 | ||
1506 | /* send learning packets */ | |
7eacd038 | 1507 | if (bond_info->lp_counter >= BOND_ALB_LP_TICKS(bond)) { |
1da177e4 LT |
1508 | /* change of curr_active_slave involves swapping of mac addresses. |
1509 | * in order to avoid this swapping from happening while | |
1510 | * sending the learning packets, the curr_slave_lock must be held for | |
1511 | * read. | |
1512 | */ | |
1513 | read_lock(&bond->curr_slave_lock); | |
1514 | ||
733ab639 | 1515 | bond_for_each_slave_rcu(bond, slave, iter) |
e944ef79 | 1516 | alb_send_learning_packets(slave, slave->dev->dev_addr); |
1da177e4 LT |
1517 | |
1518 | read_unlock(&bond->curr_slave_lock); | |
1519 | ||
1520 | bond_info->lp_counter = 0; | |
1521 | } | |
1522 | ||
1523 | /* rebalance tx traffic */ | |
1524 | if (bond_info->tx_rebalance_counter >= BOND_TLB_REBALANCE_TICKS) { | |
1525 | ||
1526 | read_lock(&bond->curr_slave_lock); | |
1527 | ||
733ab639 | 1528 | bond_for_each_slave_rcu(bond, slave, iter) { |
1da177e4 LT |
1529 | tlb_clear_slave(bond, slave, 1); |
1530 | if (slave == bond->curr_active_slave) { | |
1531 | SLAVE_TLB_INFO(slave).load = | |
1532 | bond_info->unbalanced_load / | |
1533 | BOND_TLB_REBALANCE_INTERVAL; | |
1534 | bond_info->unbalanced_load = 0; | |
1535 | } | |
1536 | } | |
1537 | ||
1538 | read_unlock(&bond->curr_slave_lock); | |
1539 | ||
1540 | bond_info->tx_rebalance_counter = 0; | |
1541 | } | |
1542 | ||
1543 | /* handle rlb stuff */ | |
1544 | if (bond_info->rlb_enabled) { | |
1da177e4 LT |
1545 | if (bond_info->primary_is_promisc && |
1546 | (++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) { | |
1547 | ||
1f2cd845 DM |
1548 | /* |
1549 | * dev_set_promiscuity requires rtnl and | |
1550 | * nothing else. Avoid race with bond_close. | |
1551 | */ | |
733ab639 | 1552 | rcu_read_unlock(); |
1553 | if (!rtnl_trylock()) | |
1f2cd845 | 1554 | goto re_arm; |
1f2cd845 | 1555 | |
1da177e4 LT |
1556 | bond_info->rlb_promisc_timeout_counter = 0; |
1557 | ||
1558 | /* If the primary was set to promiscuous mode | |
1559 | * because a slave was disabled then | |
1560 | * it can now leave promiscuous mode. | |
1561 | */ | |
1562 | dev_set_promiscuity(bond->curr_active_slave->dev, -1); | |
1563 | bond_info->primary_is_promisc = 0; | |
1f2cd845 DM |
1564 | |
1565 | rtnl_unlock(); | |
733ab639 | 1566 | rcu_read_lock(); |
d0e81b7e | 1567 | } |
1da177e4 LT |
1568 | |
1569 | if (bond_info->rlb_rebalance) { | |
1570 | bond_info->rlb_rebalance = 0; | |
1571 | rlb_rebalance(bond); | |
1572 | } | |
1573 | ||
1574 | /* check if clients need updating */ | |
1575 | if (bond_info->rx_ntt) { | |
1576 | if (bond_info->rlb_update_delay_counter) { | |
1577 | --bond_info->rlb_update_delay_counter; | |
1578 | } else { | |
1579 | rlb_update_rx_clients(bond); | |
1580 | if (bond_info->rlb_update_retry_counter) { | |
1581 | --bond_info->rlb_update_retry_counter; | |
1582 | } else { | |
1583 | bond_info->rx_ntt = 0; | |
1584 | } | |
1585 | } | |
1586 | } | |
1587 | } | |
733ab639 | 1588 | rcu_read_unlock(); |
1da177e4 | 1589 | re_arm: |
e6d265e8 | 1590 | queue_delayed_work(bond->wq, &bond->alb_work, alb_delta_in_ticks); |
1da177e4 LT |
1591 | } |
1592 | ||
1593 | /* assumption: called before the slave is attached to the bond | |
1594 | * and not locked by the bond lock | |
1595 | */ | |
1596 | int bond_alb_init_slave(struct bonding *bond, struct slave *slave) | |
1597 | { | |
1598 | int res; | |
1599 | ||
b924551b | 1600 | res = alb_set_slave_mac_addr(slave, slave->perm_hwaddr); |
1da177e4 LT |
1601 | if (res) { |
1602 | return res; | |
1603 | } | |
1604 | ||
1da177e4 | 1605 | res = alb_handle_addr_collision_on_attach(bond, slave); |
1da177e4 LT |
1606 | if (res) { |
1607 | return res; | |
1608 | } | |
1609 | ||
1610 | tlb_init_slave(slave); | |
1611 | ||
1612 | /* order a rebalance ASAP */ | |
1613 | bond->alb_info.tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS; | |
1614 | ||
1615 | if (bond->alb_info.rlb_enabled) { | |
1616 | bond->alb_info.rlb_rebalance = 1; | |
1617 | } | |
1618 | ||
1619 | return 0; | |
1620 | } | |
1621 | ||
2543331d JV |
1622 | /* |
1623 | * Remove slave from tlb and rlb hash tables, and fix up MAC addresses | |
1624 | * if necessary. | |
1625 | * | |
1626 | * Caller must hold RTNL and no other locks | |
1627 | */ | |
1da177e4 LT |
1628 | void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave) |
1629 | { | |
0965a1f3 | 1630 | if (bond_has_slaves(bond)) |
1da177e4 | 1631 | alb_change_hw_addr_on_detach(bond, slave); |
1da177e4 LT |
1632 | |
1633 | tlb_clear_slave(bond, slave, 0); | |
1634 | ||
1635 | if (bond->alb_info.rlb_enabled) { | |
6475ae4c | 1636 | bond->alb_info.rx_slave = NULL; |
1da177e4 LT |
1637 | rlb_clear_slave(bond, slave); |
1638 | } | |
1639 | } | |
1640 | ||
1641 | /* Caller must hold bond lock for read */ | |
1642 | void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link) | |
1643 | { | |
1644 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1645 | ||
1646 | if (link == BOND_LINK_DOWN) { | |
1647 | tlb_clear_slave(bond, slave, 0); | |
1648 | if (bond->alb_info.rlb_enabled) { | |
1649 | rlb_clear_slave(bond, slave); | |
1650 | } | |
1651 | } else if (link == BOND_LINK_UP) { | |
1652 | /* order a rebalance ASAP */ | |
1653 | bond_info->tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS; | |
1654 | if (bond->alb_info.rlb_enabled) { | |
1655 | bond->alb_info.rlb_rebalance = 1; | |
1656 | /* If the updelay module parameter is smaller than the | |
1657 | * forwarding delay of the switch the rebalance will | |
1658 | * not work because the rebalance arp replies will | |
1659 | * not be forwarded to the clients.. | |
1660 | */ | |
1661 | } | |
1662 | } | |
1663 | } | |
1664 | ||
1665 | /** | |
1666 | * bond_alb_handle_active_change - assign new curr_active_slave | |
1667 | * @bond: our bonding struct | |
1668 | * @new_slave: new slave to assign | |
1669 | * | |
1670 | * Set the bond->curr_active_slave to @new_slave and handle | |
1671 | * mac address swapping and promiscuity changes as needed. | |
1672 | * | |
059fe7a5 JV |
1673 | * If new_slave is NULL, caller must hold curr_slave_lock or |
1674 | * bond->lock for write. | |
1675 | * | |
b2e7aceb | 1676 | * If new_slave is not NULL, caller must hold RTNL, curr_slave_lock |
1677 | * for write. Processing here may sleep, so no other locks may be held. | |
1da177e4 LT |
1678 | */ |
1679 | void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave) | |
1f78d9f9 | 1680 | __releases(&bond->curr_slave_lock) |
1f78d9f9 | 1681 | __acquires(&bond->curr_slave_lock) |
1da177e4 LT |
1682 | { |
1683 | struct slave *swap_slave; | |
1da177e4 | 1684 | |
dec1e90e | 1685 | if (bond->curr_active_slave == new_slave) |
1da177e4 | 1686 | return; |
1da177e4 LT |
1687 | |
1688 | if (bond->curr_active_slave && bond->alb_info.primary_is_promisc) { | |
1689 | dev_set_promiscuity(bond->curr_active_slave->dev, -1); | |
1690 | bond->alb_info.primary_is_promisc = 0; | |
1691 | bond->alb_info.rlb_promisc_timeout_counter = 0; | |
1692 | } | |
1693 | ||
1694 | swap_slave = bond->curr_active_slave; | |
278b2083 | 1695 | rcu_assign_pointer(bond->curr_active_slave, new_slave); |
1da177e4 | 1696 | |
0965a1f3 | 1697 | if (!new_slave || !bond_has_slaves(bond)) |
1da177e4 | 1698 | return; |
1da177e4 LT |
1699 | |
1700 | /* set the new curr_active_slave to the bonds mac address | |
1701 | * i.e. swap mac addresses of old curr_active_slave and new curr_active_slave | |
1702 | */ | |
b88ec38d VF |
1703 | if (!swap_slave) |
1704 | swap_slave = bond_slave_has_mac(bond, bond->dev->dev_addr); | |
1da177e4 | 1705 | |
059fe7a5 JV |
1706 | /* |
1707 | * Arrange for swap_slave and new_slave to temporarily be | |
1708 | * ignored so we can mess with their MAC addresses without | |
1709 | * fear of interference from transmit activity. | |
1710 | */ | |
dec1e90e | 1711 | if (swap_slave) |
059fe7a5 | 1712 | tlb_clear_slave(bond, swap_slave, 1); |
059fe7a5 JV |
1713 | tlb_clear_slave(bond, new_slave, 1); |
1714 | ||
1715 | write_unlock_bh(&bond->curr_slave_lock); | |
059fe7a5 | 1716 | |
e0138a66 JV |
1717 | ASSERT_RTNL(); |
1718 | ||
4996b909 VF |
1719 | /* in TLB mode, the slave might flip down/up with the old dev_addr, |
1720 | * and thus filter bond->dev_addr's packets, so force bond's mac | |
1721 | */ | |
1722 | if (bond->params.mode == BOND_MODE_TLB) { | |
1723 | struct sockaddr sa; | |
1724 | u8 tmp_addr[ETH_ALEN]; | |
1725 | ||
1726 | memcpy(tmp_addr, new_slave->dev->dev_addr, ETH_ALEN); | |
1727 | ||
1728 | memcpy(sa.sa_data, bond->dev->dev_addr, bond->dev->addr_len); | |
1729 | sa.sa_family = bond->dev->type; | |
1730 | /* we don't care if it can't change its mac, best effort */ | |
1731 | dev_set_mac_address(new_slave->dev, &sa); | |
1732 | ||
1733 | memcpy(new_slave->dev->dev_addr, tmp_addr, ETH_ALEN); | |
1734 | } | |
1735 | ||
1da177e4 LT |
1736 | /* curr_active_slave must be set before calling alb_swap_mac_addr */ |
1737 | if (swap_slave) { | |
1738 | /* swap mac address */ | |
43547ea6 | 1739 | alb_swap_mac_addr(swap_slave, new_slave); |
059fe7a5 JV |
1740 | alb_fasten_mac_swap(bond, swap_slave, new_slave); |
1741 | } else { | |
b88ec38d VF |
1742 | /* set the new_slave to the bond mac address */ |
1743 | alb_set_slave_mac_addr(new_slave, bond->dev->dev_addr); | |
1da177e4 LT |
1744 | alb_send_learning_packets(new_slave, bond->dev->dev_addr); |
1745 | } | |
059fe7a5 JV |
1746 | |
1747 | write_lock_bh(&bond->curr_slave_lock); | |
1da177e4 LT |
1748 | } |
1749 | ||
059fe7a5 JV |
1750 | /* |
1751 | * Called with RTNL | |
1752 | */ | |
1da177e4 | 1753 | int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr) |
1f78d9f9 | 1754 | __acquires(&bond->lock) |
815bcc27 | 1755 | __releases(&bond->lock) |
1da177e4 | 1756 | { |
454d7c9b | 1757 | struct bonding *bond = netdev_priv(bond_dev); |
1da177e4 | 1758 | struct sockaddr *sa = addr; |
b88ec38d | 1759 | struct slave *swap_slave; |
1da177e4 | 1760 | int res; |
1da177e4 LT |
1761 | |
1762 | if (!is_valid_ether_addr(sa->sa_data)) { | |
1763 | return -EADDRNOTAVAIL; | |
1764 | } | |
1765 | ||
1766 | res = alb_set_mac_address(bond, addr); | |
1767 | if (res) { | |
1768 | return res; | |
1769 | } | |
1770 | ||
1771 | memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len); | |
1772 | ||
1773 | /* If there is no curr_active_slave there is nothing else to do. | |
1774 | * Otherwise we'll need to pass the new address to it and handle | |
1775 | * duplications. | |
1776 | */ | |
1777 | if (!bond->curr_active_slave) { | |
1778 | return 0; | |
1779 | } | |
1780 | ||
b88ec38d | 1781 | swap_slave = bond_slave_has_mac(bond, bond_dev->dev_addr); |
1da177e4 LT |
1782 | |
1783 | if (swap_slave) { | |
43547ea6 | 1784 | alb_swap_mac_addr(swap_slave, bond->curr_active_slave); |
059fe7a5 | 1785 | alb_fasten_mac_swap(bond, swap_slave, bond->curr_active_slave); |
1da177e4 | 1786 | } else { |
b924551b | 1787 | alb_set_slave_mac_addr(bond->curr_active_slave, bond_dev->dev_addr); |
1da177e4 | 1788 | |
815bcc27 | 1789 | read_lock(&bond->lock); |
1da177e4 LT |
1790 | alb_send_learning_packets(bond->curr_active_slave, bond_dev->dev_addr); |
1791 | if (bond->alb_info.rlb_enabled) { | |
1792 | /* inform clients mac address has changed */ | |
1793 | rlb_req_update_slave_clients(bond, bond->curr_active_slave); | |
1794 | } | |
815bcc27 | 1795 | read_unlock(&bond->lock); |
1da177e4 LT |
1796 | } |
1797 | ||
1798 | return 0; | |
1799 | } | |
1800 | ||
1801 | void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id) | |
1802 | { | |
1da177e4 LT |
1803 | if (bond->alb_info.rlb_enabled) { |
1804 | rlb_clear_vlan(bond, vlan_id); | |
1805 | } | |
1806 | } | |
1807 |