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[]); | |
e53665c6 JB |
87 | static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp); |
88 | static void rlb_src_unlink(struct bonding *bond, u32 index); | |
89 | static void rlb_src_link(struct bonding *bond, u32 ip_src_hash, | |
90 | u32 ip_dst_hash); | |
1da177e4 | 91 | |
eddc9ec5 | 92 | static inline u8 _simple_hash(const u8 *hash_start, int hash_size) |
1da177e4 LT |
93 | { |
94 | int i; | |
95 | u8 hash = 0; | |
96 | ||
97 | for (i = 0; i < hash_size; i++) { | |
98 | hash ^= hash_start[i]; | |
99 | } | |
100 | ||
101 | return hash; | |
102 | } | |
103 | ||
104 | /*********************** tlb specific functions ***************************/ | |
105 | ||
f515e6b7 | 106 | static inline void _lock_tx_hashtbl_bh(struct bonding *bond) |
1da177e4 | 107 | { |
6603a6f2 | 108 | spin_lock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock)); |
1da177e4 LT |
109 | } |
110 | ||
f515e6b7 | 111 | static inline void _unlock_tx_hashtbl_bh(struct bonding *bond) |
1da177e4 | 112 | { |
6603a6f2 | 113 | spin_unlock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock)); |
1da177e4 LT |
114 | } |
115 | ||
f515e6b7 MU |
116 | static inline void _lock_tx_hashtbl(struct bonding *bond) |
117 | { | |
118 | spin_lock(&(BOND_ALB_INFO(bond).tx_hashtbl_lock)); | |
119 | } | |
120 | ||
121 | static inline void _unlock_tx_hashtbl(struct bonding *bond) | |
122 | { | |
123 | spin_unlock(&(BOND_ALB_INFO(bond).tx_hashtbl_lock)); | |
124 | } | |
125 | ||
1da177e4 LT |
126 | /* Caller must hold tx_hashtbl lock */ |
127 | static inline void tlb_init_table_entry(struct tlb_client_info *entry, int save_load) | |
128 | { | |
129 | if (save_load) { | |
130 | entry->load_history = 1 + entry->tx_bytes / | |
131 | BOND_TLB_REBALANCE_INTERVAL; | |
132 | entry->tx_bytes = 0; | |
133 | } | |
134 | ||
135 | entry->tx_slave = NULL; | |
136 | entry->next = TLB_NULL_INDEX; | |
137 | entry->prev = TLB_NULL_INDEX; | |
138 | } | |
139 | ||
140 | static inline void tlb_init_slave(struct slave *slave) | |
141 | { | |
142 | SLAVE_TLB_INFO(slave).load = 0; | |
143 | SLAVE_TLB_INFO(slave).head = TLB_NULL_INDEX; | |
144 | } | |
145 | ||
f515e6b7 MU |
146 | /* Caller must hold bond lock for read, BH disabled */ |
147 | static void __tlb_clear_slave(struct bonding *bond, struct slave *slave, | |
148 | int save_load) | |
1da177e4 LT |
149 | { |
150 | struct tlb_client_info *tx_hash_table; | |
151 | u32 index; | |
152 | ||
1da177e4 LT |
153 | /* clear slave from tx_hashtbl */ |
154 | tx_hash_table = BOND_ALB_INFO(bond).tx_hashtbl; | |
155 | ||
ce39a800 AG |
156 | /* skip this if we've already freed the tx hash table */ |
157 | if (tx_hash_table) { | |
158 | index = SLAVE_TLB_INFO(slave).head; | |
159 | while (index != TLB_NULL_INDEX) { | |
160 | u32 next_index = tx_hash_table[index].next; | |
161 | tlb_init_table_entry(&tx_hash_table[index], save_load); | |
162 | index = next_index; | |
163 | } | |
1da177e4 LT |
164 | } |
165 | ||
1da177e4 | 166 | tlb_init_slave(slave); |
f515e6b7 | 167 | } |
5af47b2f | 168 | |
f515e6b7 MU |
169 | /* Caller must hold bond lock for read */ |
170 | static void tlb_clear_slave(struct bonding *bond, struct slave *slave, | |
171 | int save_load) | |
172 | { | |
173 | _lock_tx_hashtbl_bh(bond); | |
174 | __tlb_clear_slave(bond, slave, save_load); | |
175 | _unlock_tx_hashtbl_bh(bond); | |
1da177e4 LT |
176 | } |
177 | ||
178 | /* Must be called before starting the monitor timer */ | |
179 | static int tlb_initialize(struct bonding *bond) | |
180 | { | |
181 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
182 | int size = TLB_HASH_TABLE_SIZE * sizeof(struct tlb_client_info); | |
0d206a3a | 183 | struct tlb_client_info *new_hashtbl; |
1da177e4 LT |
184 | int i; |
185 | ||
243cb4e5 | 186 | new_hashtbl = kzalloc(size, GFP_KERNEL); |
e404decb | 187 | if (!new_hashtbl) |
1da177e4 | 188 | return -1; |
e404decb | 189 | |
f515e6b7 | 190 | _lock_tx_hashtbl_bh(bond); |
0d206a3a MW |
191 | |
192 | bond_info->tx_hashtbl = new_hashtbl; | |
1da177e4 | 193 | |
1da177e4 | 194 | for (i = 0; i < TLB_HASH_TABLE_SIZE; i++) { |
38dbaf0a | 195 | tlb_init_table_entry(&bond_info->tx_hashtbl[i], 0); |
1da177e4 LT |
196 | } |
197 | ||
f515e6b7 | 198 | _unlock_tx_hashtbl_bh(bond); |
1da177e4 LT |
199 | |
200 | return 0; | |
201 | } | |
202 | ||
203 | /* Must be called only after all slaves have been released */ | |
204 | static void tlb_deinitialize(struct bonding *bond) | |
205 | { | |
206 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
207 | ||
f515e6b7 | 208 | _lock_tx_hashtbl_bh(bond); |
1da177e4 LT |
209 | |
210 | kfree(bond_info->tx_hashtbl); | |
211 | bond_info->tx_hashtbl = NULL; | |
212 | ||
f515e6b7 | 213 | _unlock_tx_hashtbl_bh(bond); |
1da177e4 LT |
214 | } |
215 | ||
097811bb JP |
216 | static long long compute_gap(struct slave *slave) |
217 | { | |
218 | return (s64) (slave->speed << 20) - /* Convert to Megabit per sec */ | |
219 | (s64) (SLAVE_TLB_INFO(slave).load << 3); /* Bytes to bits */ | |
220 | } | |
221 | ||
1da177e4 LT |
222 | /* Caller must hold bond lock for read */ |
223 | static struct slave *tlb_get_least_loaded_slave(struct bonding *bond) | |
224 | { | |
225 | struct slave *slave, *least_loaded; | |
9caff1e7 | 226 | struct list_head *iter; |
097811bb | 227 | long long max_gap; |
1da177e4 | 228 | |
097811bb JP |
229 | least_loaded = NULL; |
230 | max_gap = LLONG_MIN; | |
1da177e4 LT |
231 | |
232 | /* Find the slave with the largest gap */ | |
28c71926 | 233 | bond_for_each_slave_rcu(bond, slave, iter) { |
1da177e4 | 234 | if (SLAVE_IS_OK(slave)) { |
097811bb JP |
235 | long long gap = compute_gap(slave); |
236 | ||
1da177e4 LT |
237 | if (max_gap < gap) { |
238 | least_loaded = slave; | |
239 | max_gap = gap; | |
240 | } | |
241 | } | |
242 | } | |
243 | ||
244 | return least_loaded; | |
245 | } | |
246 | ||
f515e6b7 MU |
247 | static struct slave *__tlb_choose_channel(struct bonding *bond, u32 hash_index, |
248 | u32 skb_len) | |
1da177e4 LT |
249 | { |
250 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
251 | struct tlb_client_info *hash_table; | |
252 | struct slave *assigned_slave; | |
253 | ||
1da177e4 LT |
254 | hash_table = bond_info->tx_hashtbl; |
255 | assigned_slave = hash_table[hash_index].tx_slave; | |
256 | if (!assigned_slave) { | |
257 | assigned_slave = tlb_get_least_loaded_slave(bond); | |
258 | ||
259 | if (assigned_slave) { | |
260 | struct tlb_slave_info *slave_info = | |
261 | &(SLAVE_TLB_INFO(assigned_slave)); | |
262 | u32 next_index = slave_info->head; | |
263 | ||
264 | hash_table[hash_index].tx_slave = assigned_slave; | |
265 | hash_table[hash_index].next = next_index; | |
266 | hash_table[hash_index].prev = TLB_NULL_INDEX; | |
267 | ||
268 | if (next_index != TLB_NULL_INDEX) { | |
269 | hash_table[next_index].prev = hash_index; | |
270 | } | |
271 | ||
272 | slave_info->head = hash_index; | |
273 | slave_info->load += | |
274 | hash_table[hash_index].load_history; | |
275 | } | |
276 | } | |
277 | ||
278 | if (assigned_slave) { | |
279 | hash_table[hash_index].tx_bytes += skb_len; | |
280 | } | |
281 | ||
1da177e4 LT |
282 | return assigned_slave; |
283 | } | |
284 | ||
f515e6b7 MU |
285 | /* Caller must hold bond lock for read */ |
286 | static struct slave *tlb_choose_channel(struct bonding *bond, u32 hash_index, | |
287 | u32 skb_len) | |
288 | { | |
289 | struct slave *tx_slave; | |
290 | /* | |
291 | * We don't need to disable softirq here, becase | |
292 | * tlb_choose_channel() is only called by bond_alb_xmit() | |
293 | * which already has softirq disabled. | |
294 | */ | |
295 | _lock_tx_hashtbl(bond); | |
296 | tx_slave = __tlb_choose_channel(bond, hash_index, skb_len); | |
297 | _unlock_tx_hashtbl(bond); | |
298 | return tx_slave; | |
299 | } | |
300 | ||
1da177e4 | 301 | /*********************** rlb specific functions ***************************/ |
f515e6b7 | 302 | static inline void _lock_rx_hashtbl_bh(struct bonding *bond) |
1da177e4 | 303 | { |
6603a6f2 | 304 | spin_lock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock)); |
1da177e4 LT |
305 | } |
306 | ||
f515e6b7 | 307 | static inline void _unlock_rx_hashtbl_bh(struct bonding *bond) |
1da177e4 | 308 | { |
6603a6f2 | 309 | spin_unlock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock)); |
1da177e4 LT |
310 | } |
311 | ||
f515e6b7 MU |
312 | static inline void _lock_rx_hashtbl(struct bonding *bond) |
313 | { | |
314 | spin_lock(&(BOND_ALB_INFO(bond).rx_hashtbl_lock)); | |
315 | } | |
316 | ||
317 | static inline void _unlock_rx_hashtbl(struct bonding *bond) | |
318 | { | |
319 | spin_unlock(&(BOND_ALB_INFO(bond).rx_hashtbl_lock)); | |
320 | } | |
321 | ||
1da177e4 LT |
322 | /* when an ARP REPLY is received from a client update its info |
323 | * in the rx_hashtbl | |
324 | */ | |
325 | static void rlb_update_entry_from_arp(struct bonding *bond, struct arp_pkt *arp) | |
326 | { | |
327 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
328 | struct rlb_client_info *client_info; | |
329 | u32 hash_index; | |
330 | ||
f515e6b7 | 331 | _lock_rx_hashtbl_bh(bond); |
1da177e4 LT |
332 | |
333 | hash_index = _simple_hash((u8*)&(arp->ip_src), sizeof(arp->ip_src)); | |
334 | client_info = &(bond_info->rx_hashtbl[hash_index]); | |
335 | ||
336 | if ((client_info->assigned) && | |
337 | (client_info->ip_src == arp->ip_dst) && | |
42d782ac | 338 | (client_info->ip_dst == arp->ip_src) && |
a6700db1 | 339 | (!ether_addr_equal_64bits(client_info->mac_dst, arp->mac_src))) { |
1da177e4 LT |
340 | /* update the clients MAC address */ |
341 | memcpy(client_info->mac_dst, arp->mac_src, ETH_ALEN); | |
342 | client_info->ntt = 1; | |
343 | bond_info->rx_ntt = 1; | |
344 | } | |
345 | ||
f515e6b7 | 346 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 LT |
347 | } |
348 | ||
de063b70 ED |
349 | static int rlb_arp_recv(const struct sk_buff *skb, struct bonding *bond, |
350 | struct slave *slave) | |
1da177e4 | 351 | { |
de063b70 | 352 | struct arp_pkt *arp, _arp; |
1da177e4 | 353 | |
3aba891d | 354 | if (skb->protocol != cpu_to_be16(ETH_P_ARP)) |
b99215cd | 355 | goto out; |
1da177e4 | 356 | |
de063b70 ED |
357 | arp = skb_header_pointer(skb, 0, sizeof(_arp), &_arp); |
358 | if (!arp) | |
b99215cd | 359 | goto out; |
1da177e4 | 360 | |
e53665c6 JB |
361 | /* We received an ARP from arp->ip_src. |
362 | * We might have used this IP address previously (on the bonding host | |
363 | * itself or on a system that is bridged together with the bond). | |
364 | * However, if arp->mac_src is different than what is stored in | |
365 | * rx_hashtbl, some other host is now using the IP and we must prevent | |
366 | * sending out client updates with this IP address and the old MAC | |
367 | * address. | |
368 | * Clean up all hash table entries that have this address as ip_src but | |
369 | * have a different mac_src. | |
370 | */ | |
371 | rlb_purge_src_ip(bond, arp); | |
372 | ||
1da177e4 LT |
373 | if (arp->op_code == htons(ARPOP_REPLY)) { |
374 | /* update rx hash table for this ARP */ | |
375 | rlb_update_entry_from_arp(bond, arp); | |
5a03cdb7 | 376 | pr_debug("Server received an ARP Reply from client\n"); |
1da177e4 | 377 | } |
b99215cd DM |
378 | out: |
379 | return RX_HANDLER_ANOTHER; | |
1da177e4 LT |
380 | } |
381 | ||
382 | /* Caller must hold bond lock for read */ | |
383 | static struct slave *rlb_next_rx_slave(struct bonding *bond) | |
384 | { | |
385 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
6475ae4c VF |
386 | struct slave *before = NULL, *rx_slave = NULL, *slave; |
387 | struct list_head *iter; | |
388 | bool found = false; | |
1da177e4 | 389 | |
6475ae4c VF |
390 | bond_for_each_slave(bond, slave, iter) { |
391 | if (!SLAVE_IS_OK(slave)) | |
392 | continue; | |
393 | if (!found) { | |
394 | if (!before || before->speed < slave->speed) | |
395 | before = slave; | |
396 | } else { | |
397 | if (!rx_slave || rx_slave->speed < slave->speed) | |
1da177e4 | 398 | rx_slave = slave; |
1da177e4 | 399 | } |
6475ae4c VF |
400 | if (slave == bond_info->rx_slave) |
401 | found = true; | |
1da177e4 | 402 | } |
6475ae4c VF |
403 | /* we didn't find anything after the current or we have something |
404 | * better before and up to the current slave | |
405 | */ | |
406 | if (!rx_slave || (before && rx_slave->speed < before->speed)) | |
407 | rx_slave = before; | |
1da177e4 | 408 | |
6475ae4c VF |
409 | if (rx_slave) |
410 | bond_info->rx_slave = rx_slave; | |
1da177e4 LT |
411 | |
412 | return rx_slave; | |
413 | } | |
414 | ||
28c71926 | 415 | /* Caller must hold rcu_read_lock() for read */ |
416 | static struct slave *__rlb_next_rx_slave(struct bonding *bond) | |
417 | { | |
418 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
419 | struct slave *before = NULL, *rx_slave = NULL, *slave; | |
420 | struct list_head *iter; | |
421 | bool found = false; | |
422 | ||
423 | bond_for_each_slave_rcu(bond, slave, iter) { | |
424 | if (!SLAVE_IS_OK(slave)) | |
425 | continue; | |
426 | if (!found) { | |
427 | if (!before || before->speed < slave->speed) | |
428 | before = slave; | |
429 | } else { | |
430 | if (!rx_slave || rx_slave->speed < slave->speed) | |
431 | rx_slave = slave; | |
432 | } | |
433 | if (slave == bond_info->rx_slave) | |
434 | found = true; | |
435 | } | |
436 | /* we didn't find anything after the current or we have something | |
437 | * better before and up to the current slave | |
438 | */ | |
439 | if (!rx_slave || (before && rx_slave->speed < before->speed)) | |
440 | rx_slave = before; | |
441 | ||
442 | if (rx_slave) | |
443 | bond_info->rx_slave = rx_slave; | |
444 | ||
445 | return rx_slave; | |
446 | } | |
447 | ||
1da177e4 LT |
448 | /* teach the switch the mac of a disabled slave |
449 | * on the primary for fault tolerance | |
450 | * | |
451 | * Caller must hold bond->curr_slave_lock for write or bond lock for write | |
452 | */ | |
453 | static void rlb_teach_disabled_mac_on_primary(struct bonding *bond, u8 addr[]) | |
454 | { | |
455 | if (!bond->curr_active_slave) { | |
456 | return; | |
457 | } | |
458 | ||
459 | if (!bond->alb_info.primary_is_promisc) { | |
7e1a1ac1 WC |
460 | if (!dev_set_promiscuity(bond->curr_active_slave->dev, 1)) |
461 | bond->alb_info.primary_is_promisc = 1; | |
462 | else | |
463 | bond->alb_info.primary_is_promisc = 0; | |
1da177e4 LT |
464 | } |
465 | ||
466 | bond->alb_info.rlb_promisc_timeout_counter = 0; | |
467 | ||
468 | alb_send_learning_packets(bond->curr_active_slave, addr); | |
469 | } | |
470 | ||
471 | /* slave being removed should not be active at this point | |
472 | * | |
473 | * Caller must hold bond lock for read | |
474 | */ | |
475 | static void rlb_clear_slave(struct bonding *bond, struct slave *slave) | |
476 | { | |
477 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
478 | struct rlb_client_info *rx_hash_table; | |
479 | u32 index, next_index; | |
480 | ||
481 | /* clear slave from rx_hashtbl */ | |
f515e6b7 | 482 | _lock_rx_hashtbl_bh(bond); |
1da177e4 LT |
483 | |
484 | rx_hash_table = bond_info->rx_hashtbl; | |
e53665c6 | 485 | index = bond_info->rx_hashtbl_used_head; |
1da177e4 | 486 | for (; index != RLB_NULL_INDEX; index = next_index) { |
e53665c6 | 487 | next_index = rx_hash_table[index].used_next; |
1da177e4 LT |
488 | if (rx_hash_table[index].slave == slave) { |
489 | struct slave *assigned_slave = rlb_next_rx_slave(bond); | |
490 | ||
491 | if (assigned_slave) { | |
492 | rx_hash_table[index].slave = assigned_slave; | |
a6700db1 JP |
493 | if (!ether_addr_equal_64bits(rx_hash_table[index].mac_dst, |
494 | mac_bcast)) { | |
1da177e4 LT |
495 | bond_info->rx_hashtbl[index].ntt = 1; |
496 | bond_info->rx_ntt = 1; | |
497 | /* A slave has been removed from the | |
498 | * table because it is either disabled | |
499 | * or being released. We must retry the | |
500 | * update to avoid clients from not | |
501 | * being updated & disconnecting when | |
502 | * there is stress | |
503 | */ | |
504 | bond_info->rlb_update_retry_counter = | |
505 | RLB_UPDATE_RETRY; | |
506 | } | |
507 | } else { /* there is no active slave */ | |
508 | rx_hash_table[index].slave = NULL; | |
509 | } | |
510 | } | |
511 | } | |
512 | ||
f515e6b7 | 513 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 | 514 | |
6603a6f2 | 515 | write_lock_bh(&bond->curr_slave_lock); |
1da177e4 LT |
516 | |
517 | if (slave != bond->curr_active_slave) { | |
518 | rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr); | |
519 | } | |
520 | ||
6603a6f2 | 521 | write_unlock_bh(&bond->curr_slave_lock); |
1da177e4 LT |
522 | } |
523 | ||
524 | static void rlb_update_client(struct rlb_client_info *client_info) | |
525 | { | |
526 | int i; | |
527 | ||
528 | if (!client_info->slave) { | |
529 | return; | |
530 | } | |
531 | ||
532 | for (i = 0; i < RLB_ARP_BURST_SIZE; i++) { | |
533 | struct sk_buff *skb; | |
534 | ||
535 | skb = arp_create(ARPOP_REPLY, ETH_P_ARP, | |
536 | client_info->ip_dst, | |
537 | client_info->slave->dev, | |
538 | client_info->ip_src, | |
539 | client_info->mac_dst, | |
540 | client_info->slave->dev->dev_addr, | |
541 | client_info->mac_dst); | |
542 | if (!skb) { | |
a4aee5c8 | 543 | pr_err("%s: Error: failed to create an ARP packet\n", |
471cb5a3 | 544 | client_info->slave->bond->dev->name); |
1da177e4 LT |
545 | continue; |
546 | } | |
547 | ||
548 | skb->dev = client_info->slave->dev; | |
549 | ||
d3ab3ffd | 550 | if (client_info->vlan_id) { |
86a9bad3 | 551 | skb = vlan_put_tag(skb, htons(ETH_P_8021Q), client_info->vlan_id); |
1da177e4 | 552 | if (!skb) { |
a4aee5c8 | 553 | pr_err("%s: Error: failed to insert VLAN tag\n", |
471cb5a3 | 554 | client_info->slave->bond->dev->name); |
1da177e4 LT |
555 | continue; |
556 | } | |
557 | } | |
558 | ||
559 | arp_xmit(skb); | |
560 | } | |
561 | } | |
562 | ||
563 | /* sends ARP REPLIES that update the clients that need updating */ | |
564 | static void rlb_update_rx_clients(struct bonding *bond) | |
565 | { | |
566 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
567 | struct rlb_client_info *client_info; | |
568 | u32 hash_index; | |
569 | ||
f515e6b7 | 570 | _lock_rx_hashtbl_bh(bond); |
1da177e4 | 571 | |
e53665c6 JB |
572 | hash_index = bond_info->rx_hashtbl_used_head; |
573 | for (; hash_index != RLB_NULL_INDEX; | |
574 | hash_index = client_info->used_next) { | |
1da177e4 LT |
575 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
576 | if (client_info->ntt) { | |
577 | rlb_update_client(client_info); | |
578 | if (bond_info->rlb_update_retry_counter == 0) { | |
579 | client_info->ntt = 0; | |
580 | } | |
581 | } | |
582 | } | |
583 | ||
94e2bd68 | 584 | /* do not update the entries again until this counter is zero so that |
1da177e4 LT |
585 | * not to confuse the clients. |
586 | */ | |
587 | bond_info->rlb_update_delay_counter = RLB_UPDATE_DELAY; | |
588 | ||
f515e6b7 | 589 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 LT |
590 | } |
591 | ||
592 | /* The slave was assigned a new mac address - update the clients */ | |
593 | static void rlb_req_update_slave_clients(struct bonding *bond, struct slave *slave) | |
594 | { | |
595 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
596 | struct rlb_client_info *client_info; | |
597 | int ntt = 0; | |
598 | u32 hash_index; | |
599 | ||
f515e6b7 | 600 | _lock_rx_hashtbl_bh(bond); |
1da177e4 | 601 | |
e53665c6 JB |
602 | hash_index = bond_info->rx_hashtbl_used_head; |
603 | for (; hash_index != RLB_NULL_INDEX; | |
604 | hash_index = client_info->used_next) { | |
1da177e4 LT |
605 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
606 | ||
607 | if ((client_info->slave == slave) && | |
a6700db1 | 608 | !ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) { |
1da177e4 LT |
609 | client_info->ntt = 1; |
610 | ntt = 1; | |
611 | } | |
612 | } | |
613 | ||
614 | // update the team's flag only after the whole iteration | |
615 | if (ntt) { | |
616 | bond_info->rx_ntt = 1; | |
617 | //fasten the change | |
618 | bond_info->rlb_update_retry_counter = RLB_UPDATE_RETRY; | |
619 | } | |
620 | ||
f515e6b7 | 621 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 LT |
622 | } |
623 | ||
624 | /* mark all clients using src_ip to be updated */ | |
d3bb52b0 | 625 | static void rlb_req_update_subnet_clients(struct bonding *bond, __be32 src_ip) |
1da177e4 LT |
626 | { |
627 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
628 | struct rlb_client_info *client_info; | |
629 | u32 hash_index; | |
630 | ||
631 | _lock_rx_hashtbl(bond); | |
632 | ||
e53665c6 JB |
633 | hash_index = bond_info->rx_hashtbl_used_head; |
634 | for (; hash_index != RLB_NULL_INDEX; | |
635 | hash_index = client_info->used_next) { | |
1da177e4 LT |
636 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
637 | ||
638 | if (!client_info->slave) { | |
a4aee5c8 | 639 | pr_err("%s: Error: found a client with no channel in the client's hash table\n", |
4e0952c7 | 640 | bond->dev->name); |
1da177e4 LT |
641 | continue; |
642 | } | |
643 | /*update all clients using this src_ip, that are not assigned | |
644 | * to the team's address (curr_active_slave) and have a known | |
645 | * unicast mac address. | |
646 | */ | |
647 | if ((client_info->ip_src == src_ip) && | |
a6700db1 JP |
648 | !ether_addr_equal_64bits(client_info->slave->dev->dev_addr, |
649 | bond->dev->dev_addr) && | |
650 | !ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) { | |
1da177e4 LT |
651 | client_info->ntt = 1; |
652 | bond_info->rx_ntt = 1; | |
653 | } | |
654 | } | |
655 | ||
656 | _unlock_rx_hashtbl(bond); | |
657 | } | |
658 | ||
659 | /* Caller must hold both bond and ptr locks for read */ | |
660 | static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bond) | |
661 | { | |
662 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
a16aeb36 | 663 | struct arp_pkt *arp = arp_pkt(skb); |
28c71926 | 664 | struct slave *assigned_slave, *curr_active_slave; |
1da177e4 LT |
665 | struct rlb_client_info *client_info; |
666 | u32 hash_index = 0; | |
667 | ||
668 | _lock_rx_hashtbl(bond); | |
669 | ||
28c71926 | 670 | curr_active_slave = rcu_dereference(bond->curr_active_slave); |
671 | ||
e364a341 | 672 | hash_index = _simple_hash((u8 *)&arp->ip_dst, sizeof(arp->ip_dst)); |
1da177e4 LT |
673 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
674 | ||
675 | if (client_info->assigned) { | |
676 | if ((client_info->ip_src == arp->ip_src) && | |
677 | (client_info->ip_dst == arp->ip_dst)) { | |
678 | /* the entry is already assigned to this client */ | |
a6700db1 | 679 | if (!ether_addr_equal_64bits(arp->mac_dst, mac_bcast)) { |
1da177e4 LT |
680 | /* update mac address from arp */ |
681 | memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN); | |
682 | } | |
e53665c6 | 683 | memcpy(client_info->mac_src, arp->mac_src, ETH_ALEN); |
1da177e4 LT |
684 | |
685 | assigned_slave = client_info->slave; | |
686 | if (assigned_slave) { | |
687 | _unlock_rx_hashtbl(bond); | |
688 | return assigned_slave; | |
689 | } | |
690 | } else { | |
691 | /* the entry is already assigned to some other client, | |
692 | * move the old client to primary (curr_active_slave) so | |
693 | * that the new client can be assigned to this entry. | |
694 | */ | |
695 | if (bond->curr_active_slave && | |
28c71926 | 696 | client_info->slave != curr_active_slave) { |
697 | client_info->slave = curr_active_slave; | |
1da177e4 LT |
698 | rlb_update_client(client_info); |
699 | } | |
700 | } | |
701 | } | |
702 | /* assign a new slave */ | |
28c71926 | 703 | assigned_slave = __rlb_next_rx_slave(bond); |
1da177e4 LT |
704 | |
705 | if (assigned_slave) { | |
e53665c6 JB |
706 | if (!(client_info->assigned && |
707 | client_info->ip_src == arp->ip_src)) { | |
708 | /* ip_src is going to be updated, | |
709 | * fix the src hash list | |
710 | */ | |
711 | u32 hash_src = _simple_hash((u8 *)&arp->ip_src, | |
712 | sizeof(arp->ip_src)); | |
713 | rlb_src_unlink(bond, hash_index); | |
714 | rlb_src_link(bond, hash_src, hash_index); | |
715 | } | |
716 | ||
1da177e4 LT |
717 | client_info->ip_src = arp->ip_src; |
718 | client_info->ip_dst = arp->ip_dst; | |
719 | /* arp->mac_dst is broadcast for arp reqeusts. | |
720 | * will be updated with clients actual unicast mac address | |
721 | * upon receiving an arp reply. | |
722 | */ | |
723 | memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN); | |
e53665c6 | 724 | memcpy(client_info->mac_src, arp->mac_src, ETH_ALEN); |
1da177e4 LT |
725 | client_info->slave = assigned_slave; |
726 | ||
a6700db1 | 727 | if (!ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) { |
1da177e4 LT |
728 | client_info->ntt = 1; |
729 | bond->alb_info.rx_ntt = 1; | |
730 | } else { | |
731 | client_info->ntt = 0; | |
732 | } | |
733 | ||
6f477d42 | 734 | if (!vlan_get_tag(skb, &client_info->vlan_id)) |
d3ab3ffd | 735 | client_info->vlan_id = 0; |
1da177e4 LT |
736 | |
737 | if (!client_info->assigned) { | |
e53665c6 JB |
738 | u32 prev_tbl_head = bond_info->rx_hashtbl_used_head; |
739 | bond_info->rx_hashtbl_used_head = hash_index; | |
740 | client_info->used_next = prev_tbl_head; | |
1da177e4 | 741 | if (prev_tbl_head != RLB_NULL_INDEX) { |
e53665c6 | 742 | bond_info->rx_hashtbl[prev_tbl_head].used_prev = |
1da177e4 LT |
743 | hash_index; |
744 | } | |
745 | client_info->assigned = 1; | |
746 | } | |
747 | } | |
748 | ||
749 | _unlock_rx_hashtbl(bond); | |
750 | ||
751 | return assigned_slave; | |
752 | } | |
753 | ||
754 | /* chooses (and returns) transmit channel for arp reply | |
755 | * does not choose channel for other arp types since they are | |
756 | * sent on the curr_active_slave | |
757 | */ | |
758 | static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond) | |
759 | { | |
a16aeb36 | 760 | struct arp_pkt *arp = arp_pkt(skb); |
1da177e4 LT |
761 | struct slave *tx_slave = NULL; |
762 | ||
567b871e | 763 | /* Don't modify or load balance ARPs that do not originate locally |
764 | * (e.g.,arrive via a bridge). | |
765 | */ | |
28c71926 | 766 | if (!bond_slave_has_mac_rcu(bond, arp->mac_src)) |
567b871e | 767 | return NULL; |
768 | ||
f14c4e4e | 769 | if (arp->op_code == htons(ARPOP_REPLY)) { |
1da177e4 LT |
770 | /* the arp must be sent on the selected |
771 | * rx channel | |
772 | */ | |
773 | tx_slave = rlb_choose_channel(skb, bond); | |
774 | if (tx_slave) { | |
775 | memcpy(arp->mac_src,tx_slave->dev->dev_addr, ETH_ALEN); | |
776 | } | |
5a03cdb7 | 777 | pr_debug("Server sent ARP Reply packet\n"); |
f14c4e4e | 778 | } else if (arp->op_code == htons(ARPOP_REQUEST)) { |
1da177e4 LT |
779 | /* Create an entry in the rx_hashtbl for this client as a |
780 | * place holder. | |
781 | * When the arp reply is received the entry will be updated | |
782 | * with the correct unicast address of the client. | |
783 | */ | |
784 | rlb_choose_channel(skb, bond); | |
785 | ||
77c8e2c0 | 786 | /* The ARP reply packets must be delayed so that |
1da177e4 LT |
787 | * they can cancel out the influence of the ARP request. |
788 | */ | |
789 | bond->alb_info.rlb_update_delay_counter = RLB_UPDATE_DELAY; | |
790 | ||
791 | /* arp requests are broadcast and are sent on the primary | |
792 | * the arp request will collapse all clients on the subnet to | |
793 | * the primary slave. We must register these clients to be | |
794 | * updated with their assigned mac. | |
795 | */ | |
796 | rlb_req_update_subnet_clients(bond, arp->ip_src); | |
5a03cdb7 | 797 | pr_debug("Server sent ARP Request packet\n"); |
1da177e4 LT |
798 | } |
799 | ||
800 | return tx_slave; | |
801 | } | |
802 | ||
803 | /* Caller must hold bond lock for read */ | |
804 | static void rlb_rebalance(struct bonding *bond) | |
805 | { | |
806 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
807 | struct slave *assigned_slave; | |
808 | struct rlb_client_info *client_info; | |
809 | int ntt; | |
810 | u32 hash_index; | |
811 | ||
f515e6b7 | 812 | _lock_rx_hashtbl_bh(bond); |
1da177e4 LT |
813 | |
814 | ntt = 0; | |
e53665c6 JB |
815 | hash_index = bond_info->rx_hashtbl_used_head; |
816 | for (; hash_index != RLB_NULL_INDEX; | |
817 | hash_index = client_info->used_next) { | |
1da177e4 LT |
818 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
819 | assigned_slave = rlb_next_rx_slave(bond); | |
820 | if (assigned_slave && (client_info->slave != assigned_slave)) { | |
821 | client_info->slave = assigned_slave; | |
822 | client_info->ntt = 1; | |
823 | ntt = 1; | |
824 | } | |
825 | } | |
826 | ||
827 | /* update the team's flag only after the whole iteration */ | |
828 | if (ntt) { | |
829 | bond_info->rx_ntt = 1; | |
830 | } | |
f515e6b7 | 831 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 LT |
832 | } |
833 | ||
834 | /* Caller must hold rx_hashtbl lock */ | |
e53665c6 JB |
835 | static void rlb_init_table_entry_dst(struct rlb_client_info *entry) |
836 | { | |
837 | entry->used_next = RLB_NULL_INDEX; | |
838 | entry->used_prev = RLB_NULL_INDEX; | |
839 | entry->assigned = 0; | |
840 | entry->slave = NULL; | |
d3ab3ffd | 841 | entry->vlan_id = 0; |
e53665c6 JB |
842 | } |
843 | static void rlb_init_table_entry_src(struct rlb_client_info *entry) | |
844 | { | |
845 | entry->src_first = RLB_NULL_INDEX; | |
846 | entry->src_prev = RLB_NULL_INDEX; | |
847 | entry->src_next = RLB_NULL_INDEX; | |
848 | } | |
849 | ||
1da177e4 LT |
850 | static void rlb_init_table_entry(struct rlb_client_info *entry) |
851 | { | |
852 | memset(entry, 0, sizeof(struct rlb_client_info)); | |
e53665c6 JB |
853 | rlb_init_table_entry_dst(entry); |
854 | rlb_init_table_entry_src(entry); | |
855 | } | |
856 | ||
857 | static void rlb_delete_table_entry_dst(struct bonding *bond, u32 index) | |
858 | { | |
859 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
860 | u32 next_index = bond_info->rx_hashtbl[index].used_next; | |
861 | u32 prev_index = bond_info->rx_hashtbl[index].used_prev; | |
862 | ||
863 | if (index == bond_info->rx_hashtbl_used_head) | |
864 | bond_info->rx_hashtbl_used_head = next_index; | |
865 | if (prev_index != RLB_NULL_INDEX) | |
866 | bond_info->rx_hashtbl[prev_index].used_next = next_index; | |
867 | if (next_index != RLB_NULL_INDEX) | |
868 | bond_info->rx_hashtbl[next_index].used_prev = prev_index; | |
869 | } | |
870 | ||
871 | /* unlink a rlb hash table entry from the src list */ | |
872 | static void rlb_src_unlink(struct bonding *bond, u32 index) | |
873 | { | |
874 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
875 | u32 next_index = bond_info->rx_hashtbl[index].src_next; | |
876 | u32 prev_index = bond_info->rx_hashtbl[index].src_prev; | |
877 | ||
878 | bond_info->rx_hashtbl[index].src_next = RLB_NULL_INDEX; | |
879 | bond_info->rx_hashtbl[index].src_prev = RLB_NULL_INDEX; | |
880 | ||
881 | if (next_index != RLB_NULL_INDEX) | |
882 | bond_info->rx_hashtbl[next_index].src_prev = prev_index; | |
883 | ||
884 | if (prev_index == RLB_NULL_INDEX) | |
885 | return; | |
886 | ||
887 | /* is prev_index pointing to the head of this list? */ | |
888 | if (bond_info->rx_hashtbl[prev_index].src_first == index) | |
889 | bond_info->rx_hashtbl[prev_index].src_first = next_index; | |
890 | else | |
891 | bond_info->rx_hashtbl[prev_index].src_next = next_index; | |
892 | ||
893 | } | |
894 | ||
895 | static void rlb_delete_table_entry(struct bonding *bond, u32 index) | |
896 | { | |
897 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
898 | struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]); | |
899 | ||
900 | rlb_delete_table_entry_dst(bond, index); | |
901 | rlb_init_table_entry_dst(entry); | |
902 | ||
903 | rlb_src_unlink(bond, index); | |
904 | } | |
905 | ||
906 | /* add the rx_hashtbl[ip_dst_hash] entry to the list | |
907 | * of entries with identical ip_src_hash | |
908 | */ | |
909 | static void rlb_src_link(struct bonding *bond, u32 ip_src_hash, u32 ip_dst_hash) | |
910 | { | |
911 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
912 | u32 next; | |
913 | ||
914 | bond_info->rx_hashtbl[ip_dst_hash].src_prev = ip_src_hash; | |
915 | next = bond_info->rx_hashtbl[ip_src_hash].src_first; | |
916 | bond_info->rx_hashtbl[ip_dst_hash].src_next = next; | |
917 | if (next != RLB_NULL_INDEX) | |
918 | bond_info->rx_hashtbl[next].src_prev = ip_dst_hash; | |
919 | bond_info->rx_hashtbl[ip_src_hash].src_first = ip_dst_hash; | |
920 | } | |
921 | ||
922 | /* deletes all rx_hashtbl entries with arp->ip_src if their mac_src does | |
923 | * not match arp->mac_src */ | |
924 | static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp) | |
925 | { | |
926 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
927 | u32 ip_src_hash = _simple_hash((u8*)&(arp->ip_src), sizeof(arp->ip_src)); | |
928 | u32 index; | |
929 | ||
930 | _lock_rx_hashtbl_bh(bond); | |
931 | ||
932 | index = bond_info->rx_hashtbl[ip_src_hash].src_first; | |
933 | while (index != RLB_NULL_INDEX) { | |
934 | struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]); | |
935 | u32 next_index = entry->src_next; | |
936 | if (entry->ip_src == arp->ip_src && | |
937 | !ether_addr_equal_64bits(arp->mac_src, entry->mac_src)) | |
938 | rlb_delete_table_entry(bond, index); | |
939 | index = next_index; | |
940 | } | |
941 | _unlock_rx_hashtbl_bh(bond); | |
1da177e4 LT |
942 | } |
943 | ||
944 | static int rlb_initialize(struct bonding *bond) | |
945 | { | |
946 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
0d206a3a | 947 | struct rlb_client_info *new_hashtbl; |
1da177e4 LT |
948 | int size = RLB_HASH_TABLE_SIZE * sizeof(struct rlb_client_info); |
949 | int i; | |
950 | ||
0d206a3a | 951 | new_hashtbl = kmalloc(size, GFP_KERNEL); |
e404decb | 952 | if (!new_hashtbl) |
1da177e4 | 953 | return -1; |
e404decb | 954 | |
f515e6b7 | 955 | _lock_rx_hashtbl_bh(bond); |
0d206a3a MW |
956 | |
957 | bond_info->rx_hashtbl = new_hashtbl; | |
1da177e4 | 958 | |
e53665c6 | 959 | bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX; |
1da177e4 LT |
960 | |
961 | for (i = 0; i < RLB_HASH_TABLE_SIZE; i++) { | |
962 | rlb_init_table_entry(bond_info->rx_hashtbl + i); | |
963 | } | |
964 | ||
f515e6b7 | 965 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 | 966 | |
1da177e4 | 967 | /* register to receive ARPs */ |
3aba891d | 968 | bond->recv_probe = rlb_arp_recv; |
1da177e4 LT |
969 | |
970 | return 0; | |
971 | } | |
972 | ||
973 | static void rlb_deinitialize(struct bonding *bond) | |
974 | { | |
975 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
976 | ||
f515e6b7 | 977 | _lock_rx_hashtbl_bh(bond); |
1da177e4 LT |
978 | |
979 | kfree(bond_info->rx_hashtbl); | |
980 | bond_info->rx_hashtbl = NULL; | |
e53665c6 | 981 | bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX; |
1da177e4 | 982 | |
f515e6b7 | 983 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 LT |
984 | } |
985 | ||
986 | static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id) | |
987 | { | |
988 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
989 | u32 curr_index; | |
990 | ||
f515e6b7 | 991 | _lock_rx_hashtbl_bh(bond); |
1da177e4 | 992 | |
e53665c6 | 993 | curr_index = bond_info->rx_hashtbl_used_head; |
1da177e4 LT |
994 | while (curr_index != RLB_NULL_INDEX) { |
995 | struct rlb_client_info *curr = &(bond_info->rx_hashtbl[curr_index]); | |
e53665c6 | 996 | u32 next_index = bond_info->rx_hashtbl[curr_index].used_next; |
1da177e4 | 997 | |
d3ab3ffd | 998 | if (curr->vlan_id == vlan_id) |
e53665c6 | 999 | rlb_delete_table_entry(bond, curr_index); |
1da177e4 LT |
1000 | |
1001 | curr_index = next_index; | |
1002 | } | |
1003 | ||
f515e6b7 | 1004 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 LT |
1005 | } |
1006 | ||
1007 | /*********************** tlb/rlb shared functions *********************/ | |
1008 | ||
7aa64981 VF |
1009 | static void alb_send_lp_vid(struct slave *slave, u8 mac_addr[], |
1010 | u16 vid) | |
1da177e4 | 1011 | { |
1da177e4 | 1012 | struct learning_pkt pkt; |
7aa64981 | 1013 | struct sk_buff *skb; |
1da177e4 | 1014 | int size = sizeof(struct learning_pkt); |
7aa64981 | 1015 | char *data; |
1da177e4 LT |
1016 | |
1017 | memset(&pkt, 0, size); | |
1018 | memcpy(pkt.mac_dst, mac_addr, ETH_ALEN); | |
1019 | memcpy(pkt.mac_src, mac_addr, ETH_ALEN); | |
09640e63 | 1020 | pkt.type = cpu_to_be16(ETH_P_LOOP); |
1da177e4 | 1021 | |
7aa64981 VF |
1022 | skb = dev_alloc_skb(size); |
1023 | if (!skb) | |
1024 | return; | |
1da177e4 | 1025 | |
7aa64981 VF |
1026 | data = skb_put(skb, size); |
1027 | memcpy(data, &pkt, size); | |
1028 | ||
1029 | skb_reset_mac_header(skb); | |
1030 | skb->network_header = skb->mac_header + ETH_HLEN; | |
1031 | skb->protocol = pkt.type; | |
1032 | skb->priority = TC_PRIO_CONTROL; | |
1033 | skb->dev = slave->dev; | |
1034 | ||
1035 | if (vid) { | |
1036 | skb = vlan_put_tag(skb, htons(ETH_P_8021Q), vid); | |
1da177e4 | 1037 | if (!skb) { |
7aa64981 VF |
1038 | pr_err("%s: Error: failed to insert VLAN tag\n", |
1039 | slave->bond->dev->name); | |
1da177e4 LT |
1040 | return; |
1041 | } | |
7aa64981 VF |
1042 | } |
1043 | ||
1044 | dev_queue_xmit(skb); | |
1045 | } | |
1da177e4 | 1046 | |
1da177e4 | 1047 | |
7aa64981 VF |
1048 | static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[]) |
1049 | { | |
1050 | struct bonding *bond = bond_get_bond_by_slave(slave); | |
5bf94b83 VF |
1051 | struct net_device *upper; |
1052 | struct list_head *iter; | |
1053 | ||
1054 | /* send untagged */ | |
1055 | alb_send_lp_vid(slave, mac_addr, 0); | |
1056 | ||
1057 | /* loop through vlans and send one packet for each */ | |
1058 | rcu_read_lock(); | |
2f268f12 | 1059 | netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) { |
5bf94b83 VF |
1060 | if (upper->priv_flags & IFF_802_1Q_VLAN) |
1061 | alb_send_lp_vid(slave, mac_addr, | |
1062 | vlan_dev_vlan_id(upper)); | |
1da177e4 | 1063 | } |
5bf94b83 | 1064 | rcu_read_unlock(); |
1da177e4 LT |
1065 | } |
1066 | ||
b924551b | 1067 | static int alb_set_slave_mac_addr(struct slave *slave, u8 addr[]) |
1da177e4 LT |
1068 | { |
1069 | struct net_device *dev = slave->dev; | |
1070 | struct sockaddr s_addr; | |
1071 | ||
b924551b | 1072 | if (slave->bond->params.mode == BOND_MODE_TLB) { |
1da177e4 LT |
1073 | memcpy(dev->dev_addr, addr, dev->addr_len); |
1074 | return 0; | |
1075 | } | |
1076 | ||
1077 | /* for rlb each slave must have a unique hw mac addresses so that */ | |
1078 | /* each slave will receive packets destined to a different mac */ | |
1079 | memcpy(s_addr.sa_data, addr, dev->addr_len); | |
1080 | s_addr.sa_family = dev->type; | |
1081 | if (dev_set_mac_address(dev, &s_addr)) { | |
a4aee5c8 JP |
1082 | pr_err("%s: Error: dev_set_mac_address of dev %s failed!\n" |
1083 | "ALB mode requires that the base driver support setting the hw address also when the network device's interface is open\n", | |
471cb5a3 | 1084 | slave->bond->dev->name, dev->name); |
1da177e4 LT |
1085 | return -EOPNOTSUPP; |
1086 | } | |
1087 | return 0; | |
1088 | } | |
1089 | ||
059fe7a5 JV |
1090 | /* |
1091 | * Swap MAC addresses between two slaves. | |
1092 | * | |
1093 | * Called with RTNL held, and no other locks. | |
1094 | * | |
1095 | */ | |
1096 | ||
43547ea6 | 1097 | static void alb_swap_mac_addr(struct slave *slave1, struct slave *slave2) |
1da177e4 | 1098 | { |
1da177e4 | 1099 | u8 tmp_mac_addr[ETH_ALEN]; |
1da177e4 LT |
1100 | |
1101 | memcpy(tmp_mac_addr, slave1->dev->dev_addr, ETH_ALEN); | |
b924551b JB |
1102 | alb_set_slave_mac_addr(slave1, slave2->dev->dev_addr); |
1103 | alb_set_slave_mac_addr(slave2, tmp_mac_addr); | |
1da177e4 | 1104 | |
059fe7a5 JV |
1105 | } |
1106 | ||
1107 | /* | |
1108 | * Send learning packets after MAC address swap. | |
1109 | * | |
2543331d | 1110 | * Called with RTNL and no other locks |
059fe7a5 JV |
1111 | */ |
1112 | static void alb_fasten_mac_swap(struct bonding *bond, struct slave *slave1, | |
1113 | struct slave *slave2) | |
1114 | { | |
1115 | int slaves_state_differ = (SLAVE_IS_OK(slave1) != SLAVE_IS_OK(slave2)); | |
1116 | struct slave *disabled_slave = NULL; | |
1117 | ||
2543331d JV |
1118 | ASSERT_RTNL(); |
1119 | ||
1da177e4 LT |
1120 | /* fasten the change in the switch */ |
1121 | if (SLAVE_IS_OK(slave1)) { | |
1122 | alb_send_learning_packets(slave1, slave1->dev->dev_addr); | |
1123 | if (bond->alb_info.rlb_enabled) { | |
1124 | /* inform the clients that the mac address | |
1125 | * has changed | |
1126 | */ | |
1127 | rlb_req_update_slave_clients(bond, slave1); | |
1128 | } | |
1129 | } else { | |
1130 | disabled_slave = slave1; | |
1131 | } | |
1132 | ||
1133 | if (SLAVE_IS_OK(slave2)) { | |
1134 | alb_send_learning_packets(slave2, slave2->dev->dev_addr); | |
1135 | if (bond->alb_info.rlb_enabled) { | |
1136 | /* inform the clients that the mac address | |
1137 | * has changed | |
1138 | */ | |
1139 | rlb_req_update_slave_clients(bond, slave2); | |
1140 | } | |
1141 | } else { | |
1142 | disabled_slave = slave2; | |
1143 | } | |
1144 | ||
1145 | if (bond->alb_info.rlb_enabled && slaves_state_differ) { | |
1146 | /* A disabled slave was assigned an active mac addr */ | |
1147 | rlb_teach_disabled_mac_on_primary(bond, | |
1148 | disabled_slave->dev->dev_addr); | |
1149 | } | |
1150 | } | |
1151 | ||
1152 | /** | |
1153 | * alb_change_hw_addr_on_detach | |
1154 | * @bond: bonding we're working on | |
1155 | * @slave: the slave that was just detached | |
1156 | * | |
1157 | * We assume that @slave was already detached from the slave list. | |
1158 | * | |
1159 | * If @slave's permanent hw address is different both from its current | |
1160 | * address and from @bond's address, then somewhere in the bond there's | |
1161 | * a slave that has @slave's permanet address as its current address. | |
1162 | * We'll make sure that that slave no longer uses @slave's permanent address. | |
1163 | * | |
2543331d | 1164 | * Caller must hold RTNL and no other locks |
1da177e4 LT |
1165 | */ |
1166 | static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *slave) | |
1167 | { | |
1168 | int perm_curr_diff; | |
1169 | int perm_bond_diff; | |
b88ec38d | 1170 | struct slave *found_slave; |
1da177e4 | 1171 | |
a6700db1 JP |
1172 | perm_curr_diff = !ether_addr_equal_64bits(slave->perm_hwaddr, |
1173 | slave->dev->dev_addr); | |
1174 | perm_bond_diff = !ether_addr_equal_64bits(slave->perm_hwaddr, | |
1175 | bond->dev->dev_addr); | |
1da177e4 LT |
1176 | |
1177 | if (perm_curr_diff && perm_bond_diff) { | |
b88ec38d | 1178 | found_slave = bond_slave_has_mac(bond, slave->perm_hwaddr); |
1da177e4 | 1179 | |
b88ec38d | 1180 | if (found_slave) { |
059fe7a5 | 1181 | /* locking: needs RTNL and nothing else */ |
b88ec38d VF |
1182 | alb_swap_mac_addr(slave, found_slave); |
1183 | alb_fasten_mac_swap(bond, slave, found_slave); | |
1da177e4 LT |
1184 | } |
1185 | } | |
1186 | } | |
1187 | ||
1188 | /** | |
1189 | * alb_handle_addr_collision_on_attach | |
1190 | * @bond: bonding we're working on | |
1191 | * @slave: the slave that was just attached | |
1192 | * | |
1193 | * checks uniqueness of slave's mac address and handles the case the | |
1194 | * new slave uses the bonds mac address. | |
1195 | * | |
1196 | * If the permanent hw address of @slave is @bond's hw address, we need to | |
1197 | * find a different hw address to give @slave, that isn't in use by any other | |
77c8e2c0 | 1198 | * slave in the bond. This address must be, of course, one of the permanent |
1da177e4 LT |
1199 | * addresses of the other slaves. |
1200 | * | |
1201 | * We go over the slave list, and for each slave there we compare its | |
1202 | * permanent hw address with the current address of all the other slaves. | |
1203 | * If no match was found, then we've found a slave with a permanent address | |
1204 | * that isn't used by any other slave in the bond, so we can assign it to | |
1205 | * @slave. | |
1206 | * | |
1207 | * assumption: this function is called before @slave is attached to the | |
cedb743f | 1208 | * bond slave list. |
1da177e4 LT |
1209 | */ |
1210 | static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slave *slave) | |
1211 | { | |
1da177e4 | 1212 | struct slave *has_bond_addr = bond->curr_active_slave; |
9caff1e7 VF |
1213 | struct slave *tmp_slave1, *free_mac_slave = NULL; |
1214 | struct list_head *iter; | |
1da177e4 | 1215 | |
0965a1f3 | 1216 | if (!bond_has_slaves(bond)) { |
1da177e4 LT |
1217 | /* this is the first slave */ |
1218 | return 0; | |
1219 | } | |
1220 | ||
1221 | /* if slave's mac address differs from bond's mac address | |
1222 | * check uniqueness of slave's mac address against the other | |
1223 | * slaves in the bond. | |
1224 | */ | |
a6700db1 | 1225 | if (!ether_addr_equal_64bits(slave->perm_hwaddr, bond->dev->dev_addr)) { |
cedb743f | 1226 | if (!bond_slave_has_mac(bond, slave->dev->dev_addr)) |
6b38aefe | 1227 | return 0; |
1da177e4 | 1228 | |
6b38aefe JL |
1229 | /* Try setting slave mac to bond address and fall-through |
1230 | to code handling that situation below... */ | |
b924551b | 1231 | alb_set_slave_mac_addr(slave, bond->dev->dev_addr); |
1da177e4 LT |
1232 | } |
1233 | ||
1234 | /* The slave's address is equal to the address of the bond. | |
1235 | * Search for a spare address in the bond for this slave. | |
1236 | */ | |
9caff1e7 | 1237 | bond_for_each_slave(bond, tmp_slave1, iter) { |
cedb743f | 1238 | if (!bond_slave_has_mac(bond, tmp_slave1->perm_hwaddr)) { |
1da177e4 LT |
1239 | /* no slave has tmp_slave1's perm addr |
1240 | * as its curr addr | |
1241 | */ | |
1242 | free_mac_slave = tmp_slave1; | |
1243 | break; | |
1244 | } | |
1245 | ||
1246 | if (!has_bond_addr) { | |
a6700db1 JP |
1247 | if (ether_addr_equal_64bits(tmp_slave1->dev->dev_addr, |
1248 | bond->dev->dev_addr)) { | |
1da177e4 LT |
1249 | |
1250 | has_bond_addr = tmp_slave1; | |
1251 | } | |
1252 | } | |
1253 | } | |
1254 | ||
1255 | if (free_mac_slave) { | |
b924551b | 1256 | alb_set_slave_mac_addr(slave, free_mac_slave->perm_hwaddr); |
1da177e4 | 1257 | |
a4aee5c8 | 1258 | 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 |
1259 | bond->dev->name, slave->dev->name, |
1260 | free_mac_slave->dev->name); | |
1da177e4 LT |
1261 | |
1262 | } else if (has_bond_addr) { | |
a4aee5c8 | 1263 | 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 | 1264 | bond->dev->name, slave->dev->name); |
1da177e4 LT |
1265 | return -EFAULT; |
1266 | } | |
1267 | ||
1268 | return 0; | |
1269 | } | |
1270 | ||
1271 | /** | |
1272 | * alb_set_mac_address | |
1273 | * @bond: | |
1274 | * @addr: | |
1275 | * | |
1276 | * In TLB mode all slaves are configured to the bond's hw address, but set | |
1277 | * their dev_addr field to different addresses (based on their permanent hw | |
1278 | * addresses). | |
1279 | * | |
1280 | * For each slave, this function sets the interface to the new address and then | |
1281 | * changes its dev_addr field to its previous value. | |
1282 | * | |
1283 | * Unwinding assumes bond's mac address has not yet changed. | |
1284 | */ | |
1285 | static int alb_set_mac_address(struct bonding *bond, void *addr) | |
1286 | { | |
81f23b13 | 1287 | struct slave *slave, *rollback_slave; |
9caff1e7 | 1288 | struct list_head *iter; |
dec1e90e | 1289 | struct sockaddr sa; |
81f23b13 | 1290 | char tmp_addr[ETH_ALEN]; |
1da177e4 | 1291 | int res; |
1da177e4 | 1292 | |
dec1e90e | 1293 | if (bond->alb_info.rlb_enabled) |
1da177e4 | 1294 | return 0; |
1da177e4 | 1295 | |
9caff1e7 | 1296 | bond_for_each_slave(bond, slave, iter) { |
1da177e4 LT |
1297 | /* save net_device's current hw address */ |
1298 | memcpy(tmp_addr, slave->dev->dev_addr, ETH_ALEN); | |
1299 | ||
1300 | res = dev_set_mac_address(slave->dev, addr); | |
1301 | ||
1302 | /* restore net_device's hw address */ | |
1303 | memcpy(slave->dev->dev_addr, tmp_addr, ETH_ALEN); | |
1304 | ||
eb7cc59a | 1305 | if (res) |
1da177e4 | 1306 | goto unwind; |
1da177e4 LT |
1307 | } |
1308 | ||
1309 | return 0; | |
1310 | ||
1311 | unwind: | |
1312 | memcpy(sa.sa_data, bond->dev->dev_addr, bond->dev->addr_len); | |
1313 | sa.sa_family = bond->dev->type; | |
1314 | ||
1315 | /* unwind from head to the slave that failed */ | |
9caff1e7 | 1316 | bond_for_each_slave(bond, rollback_slave, iter) { |
81f23b13 VF |
1317 | if (rollback_slave == slave) |
1318 | break; | |
1319 | memcpy(tmp_addr, rollback_slave->dev->dev_addr, ETH_ALEN); | |
1320 | dev_set_mac_address(rollback_slave->dev, &sa); | |
1321 | memcpy(rollback_slave->dev->dev_addr, tmp_addr, ETH_ALEN); | |
1da177e4 LT |
1322 | } |
1323 | ||
1324 | return res; | |
1325 | } | |
1326 | ||
1327 | /************************ exported alb funcions ************************/ | |
1328 | ||
1329 | int bond_alb_initialize(struct bonding *bond, int rlb_enabled) | |
1330 | { | |
1331 | int res; | |
1332 | ||
1333 | res = tlb_initialize(bond); | |
1334 | if (res) { | |
1335 | return res; | |
1336 | } | |
1337 | ||
1338 | if (rlb_enabled) { | |
1339 | bond->alb_info.rlb_enabled = 1; | |
1340 | /* initialize rlb */ | |
1341 | res = rlb_initialize(bond); | |
1342 | if (res) { | |
1343 | tlb_deinitialize(bond); | |
1344 | return res; | |
1345 | } | |
b76850ab MW |
1346 | } else { |
1347 | bond->alb_info.rlb_enabled = 0; | |
1da177e4 LT |
1348 | } |
1349 | ||
1350 | return 0; | |
1351 | } | |
1352 | ||
1353 | void bond_alb_deinitialize(struct bonding *bond) | |
1354 | { | |
1355 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1356 | ||
1357 | tlb_deinitialize(bond); | |
1358 | ||
1359 | if (bond_info->rlb_enabled) { | |
1360 | rlb_deinitialize(bond); | |
1361 | } | |
1362 | } | |
1363 | ||
1364 | int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev) | |
1365 | { | |
454d7c9b | 1366 | struct bonding *bond = netdev_priv(bond_dev); |
1da177e4 LT |
1367 | struct ethhdr *eth_data; |
1368 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1369 | struct slave *tx_slave = NULL; | |
d3bb52b0 | 1370 | static const __be32 ip_bcast = htonl(0xffffffff); |
1da177e4 LT |
1371 | int hash_size = 0; |
1372 | int do_tx_balance = 1; | |
1373 | u32 hash_index = 0; | |
eddc9ec5 | 1374 | const u8 *hash_start = NULL; |
1da177e4 | 1375 | int res = 1; |
2d1ea19d | 1376 | struct ipv6hdr *ip6hdr; |
1da177e4 | 1377 | |
459a98ed | 1378 | skb_reset_mac_header(skb); |
1da177e4 LT |
1379 | eth_data = eth_hdr(skb); |
1380 | ||
1da177e4 | 1381 | switch (ntohs(skb->protocol)) { |
eddc9ec5 ACM |
1382 | case ETH_P_IP: { |
1383 | const struct iphdr *iph = ip_hdr(skb); | |
1384 | ||
a6700db1 | 1385 | if (ether_addr_equal_64bits(eth_data->h_dest, mac_bcast) || |
eddc9ec5 ACM |
1386 | (iph->daddr == ip_bcast) || |
1387 | (iph->protocol == IPPROTO_IGMP)) { | |
1da177e4 LT |
1388 | do_tx_balance = 0; |
1389 | break; | |
1390 | } | |
eddc9ec5 ACM |
1391 | hash_start = (char *)&(iph->daddr); |
1392 | hash_size = sizeof(iph->daddr); | |
1393 | } | |
1da177e4 LT |
1394 | break; |
1395 | case ETH_P_IPV6: | |
2d1ea19d VY |
1396 | /* IPv6 doesn't really use broadcast mac address, but leave |
1397 | * that here just in case. | |
1398 | */ | |
a6700db1 | 1399 | if (ether_addr_equal_64bits(eth_data->h_dest, mac_bcast)) { |
1da177e4 LT |
1400 | do_tx_balance = 0; |
1401 | break; | |
2d1ea19d VY |
1402 | } |
1403 | ||
1404 | /* IPv6 uses all-nodes multicast as an equivalent to | |
1405 | * broadcasts in IPv4. | |
1406 | */ | |
a6700db1 | 1407 | if (ether_addr_equal_64bits(eth_data->h_dest, mac_v6_allmcast)) { |
2d1ea19d VY |
1408 | do_tx_balance = 0; |
1409 | break; | |
1410 | } | |
1411 | ||
1412 | /* Additianally, DAD probes should not be tx-balanced as that | |
1413 | * will lead to false positives for duplicate addresses and | |
1414 | * prevent address configuration from working. | |
1415 | */ | |
1416 | ip6hdr = ipv6_hdr(skb); | |
1417 | if (ipv6_addr_any(&ip6hdr->saddr)) { | |
1418 | do_tx_balance = 0; | |
1419 | break; | |
1da177e4 LT |
1420 | } |
1421 | ||
0660e03f ACM |
1422 | hash_start = (char *)&(ipv6_hdr(skb)->daddr); |
1423 | hash_size = sizeof(ipv6_hdr(skb)->daddr); | |
1da177e4 LT |
1424 | break; |
1425 | case ETH_P_IPX: | |
d3bb52b0 | 1426 | if (ipx_hdr(skb)->ipx_checksum != IPX_NO_CHECKSUM) { |
1da177e4 LT |
1427 | /* something is wrong with this packet */ |
1428 | do_tx_balance = 0; | |
1429 | break; | |
1430 | } | |
1431 | ||
1432 | if (ipx_hdr(skb)->ipx_type != IPX_TYPE_NCP) { | |
1433 | /* The only protocol worth balancing in | |
1434 | * this family since it has an "ARP" like | |
1435 | * mechanism | |
1436 | */ | |
1437 | do_tx_balance = 0; | |
1438 | break; | |
1439 | } | |
1440 | ||
1441 | hash_start = (char*)eth_data->h_dest; | |
1442 | hash_size = ETH_ALEN; | |
1443 | break; | |
1444 | case ETH_P_ARP: | |
1445 | do_tx_balance = 0; | |
1446 | if (bond_info->rlb_enabled) { | |
1447 | tx_slave = rlb_arp_xmit(skb, bond); | |
1448 | } | |
1449 | break; | |
1450 | default: | |
1451 | do_tx_balance = 0; | |
1452 | break; | |
1453 | } | |
1454 | ||
1455 | if (do_tx_balance) { | |
1456 | hash_index = _simple_hash(hash_start, hash_size); | |
1457 | tx_slave = tlb_choose_channel(bond, hash_index, skb->len); | |
1458 | } | |
1459 | ||
1460 | if (!tx_slave) { | |
1461 | /* unbalanced or unassigned, send through primary */ | |
28c71926 | 1462 | tx_slave = rcu_dereference(bond->curr_active_slave); |
1da177e4 LT |
1463 | bond_info->unbalanced_load += skb->len; |
1464 | } | |
1465 | ||
1466 | if (tx_slave && SLAVE_IS_OK(tx_slave)) { | |
28c71926 | 1467 | if (tx_slave != rcu_dereference(bond->curr_active_slave)) { |
1da177e4 LT |
1468 | memcpy(eth_data->h_source, |
1469 | tx_slave->dev->dev_addr, | |
1470 | ETH_ALEN); | |
1471 | } | |
1472 | ||
1473 | res = bond_dev_queue_xmit(bond, skb, tx_slave->dev); | |
1474 | } else { | |
1475 | if (tx_slave) { | |
f515e6b7 MU |
1476 | _lock_tx_hashtbl(bond); |
1477 | __tlb_clear_slave(bond, tx_slave, 0); | |
1478 | _unlock_tx_hashtbl(bond); | |
1da177e4 LT |
1479 | } |
1480 | } | |
1481 | ||
1da177e4 LT |
1482 | if (res) { |
1483 | /* no suitable interface, frame not sent */ | |
04502430 | 1484 | kfree_skb(skb); |
1da177e4 | 1485 | } |
278b2083 | 1486 | |
ec634fe3 | 1487 | return NETDEV_TX_OK; |
1da177e4 LT |
1488 | } |
1489 | ||
1b76b316 | 1490 | void bond_alb_monitor(struct work_struct *work) |
1da177e4 | 1491 | { |
1b76b316 JV |
1492 | struct bonding *bond = container_of(work, struct bonding, |
1493 | alb_work.work); | |
1da177e4 | 1494 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
9caff1e7 | 1495 | struct list_head *iter; |
1da177e4 | 1496 | struct slave *slave; |
1da177e4 | 1497 | |
2d0dafb0 | 1498 | if (!rtnl_trylock()) |
1499 | goto re_arm; | |
1da177e4 | 1500 | |
0965a1f3 | 1501 | if (!bond_has_slaves(bond)) { |
1da177e4 LT |
1502 | bond_info->tx_rebalance_counter = 0; |
1503 | bond_info->lp_counter = 0; | |
2d0dafb0 | 1504 | rtnl_unlock(); |
1da177e4 LT |
1505 | goto re_arm; |
1506 | } | |
1507 | ||
1508 | bond_info->tx_rebalance_counter++; | |
1509 | bond_info->lp_counter++; | |
1510 | ||
1511 | /* send learning packets */ | |
7eacd038 | 1512 | if (bond_info->lp_counter >= BOND_ALB_LP_TICKS(bond)) { |
1da177e4 LT |
1513 | /* change of curr_active_slave involves swapping of mac addresses. |
1514 | * in order to avoid this swapping from happening while | |
1515 | * sending the learning packets, the curr_slave_lock must be held for | |
1516 | * read. | |
1517 | */ | |
1518 | read_lock(&bond->curr_slave_lock); | |
1519 | ||
9caff1e7 | 1520 | bond_for_each_slave(bond, slave, iter) |
e944ef79 | 1521 | alb_send_learning_packets(slave, slave->dev->dev_addr); |
1da177e4 LT |
1522 | |
1523 | read_unlock(&bond->curr_slave_lock); | |
1524 | ||
1525 | bond_info->lp_counter = 0; | |
1526 | } | |
1527 | ||
1528 | /* rebalance tx traffic */ | |
1529 | if (bond_info->tx_rebalance_counter >= BOND_TLB_REBALANCE_TICKS) { | |
1530 | ||
1531 | read_lock(&bond->curr_slave_lock); | |
1532 | ||
9caff1e7 | 1533 | bond_for_each_slave(bond, slave, iter) { |
1da177e4 LT |
1534 | tlb_clear_slave(bond, slave, 1); |
1535 | if (slave == bond->curr_active_slave) { | |
1536 | SLAVE_TLB_INFO(slave).load = | |
1537 | bond_info->unbalanced_load / | |
1538 | BOND_TLB_REBALANCE_INTERVAL; | |
1539 | bond_info->unbalanced_load = 0; | |
1540 | } | |
1541 | } | |
1542 | ||
1543 | read_unlock(&bond->curr_slave_lock); | |
1544 | ||
1545 | bond_info->tx_rebalance_counter = 0; | |
1546 | } | |
1547 | ||
1548 | /* handle rlb stuff */ | |
1549 | if (bond_info->rlb_enabled) { | |
1da177e4 LT |
1550 | if (bond_info->primary_is_promisc && |
1551 | (++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) { | |
1552 | ||
1553 | bond_info->rlb_promisc_timeout_counter = 0; | |
1554 | ||
1555 | /* If the primary was set to promiscuous mode | |
1556 | * because a slave was disabled then | |
1557 | * it can now leave promiscuous mode. | |
1558 | */ | |
1559 | dev_set_promiscuity(bond->curr_active_slave->dev, -1); | |
1560 | bond_info->primary_is_promisc = 0; | |
d0e81b7e | 1561 | } |
1da177e4 LT |
1562 | |
1563 | if (bond_info->rlb_rebalance) { | |
1564 | bond_info->rlb_rebalance = 0; | |
1565 | rlb_rebalance(bond); | |
1566 | } | |
1567 | ||
1568 | /* check if clients need updating */ | |
1569 | if (bond_info->rx_ntt) { | |
1570 | if (bond_info->rlb_update_delay_counter) { | |
1571 | --bond_info->rlb_update_delay_counter; | |
1572 | } else { | |
1573 | rlb_update_rx_clients(bond); | |
1574 | if (bond_info->rlb_update_retry_counter) { | |
1575 | --bond_info->rlb_update_retry_counter; | |
1576 | } else { | |
1577 | bond_info->rx_ntt = 0; | |
1578 | } | |
1579 | } | |
1580 | } | |
1581 | } | |
1582 | ||
2d0dafb0 | 1583 | rtnl_unlock(); |
1da177e4 | 1584 | re_arm: |
e6d265e8 | 1585 | queue_delayed_work(bond->wq, &bond->alb_work, alb_delta_in_ticks); |
1da177e4 LT |
1586 | } |
1587 | ||
1588 | /* assumption: called before the slave is attached to the bond | |
1589 | * and not locked by the bond lock | |
1590 | */ | |
1591 | int bond_alb_init_slave(struct bonding *bond, struct slave *slave) | |
1592 | { | |
1593 | int res; | |
1594 | ||
b924551b | 1595 | res = alb_set_slave_mac_addr(slave, slave->perm_hwaddr); |
1da177e4 LT |
1596 | if (res) { |
1597 | return res; | |
1598 | } | |
1599 | ||
1da177e4 | 1600 | res = alb_handle_addr_collision_on_attach(bond, slave); |
1da177e4 LT |
1601 | if (res) { |
1602 | return res; | |
1603 | } | |
1604 | ||
1605 | tlb_init_slave(slave); | |
1606 | ||
1607 | /* order a rebalance ASAP */ | |
1608 | bond->alb_info.tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS; | |
1609 | ||
1610 | if (bond->alb_info.rlb_enabled) { | |
1611 | bond->alb_info.rlb_rebalance = 1; | |
1612 | } | |
1613 | ||
1614 | return 0; | |
1615 | } | |
1616 | ||
2543331d JV |
1617 | /* |
1618 | * Remove slave from tlb and rlb hash tables, and fix up MAC addresses | |
1619 | * if necessary. | |
1620 | * | |
1621 | * Caller must hold RTNL and no other locks | |
1622 | */ | |
1da177e4 LT |
1623 | void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave) |
1624 | { | |
0965a1f3 | 1625 | if (bond_has_slaves(bond)) |
1da177e4 | 1626 | alb_change_hw_addr_on_detach(bond, slave); |
1da177e4 LT |
1627 | |
1628 | tlb_clear_slave(bond, slave, 0); | |
1629 | ||
1630 | if (bond->alb_info.rlb_enabled) { | |
6475ae4c | 1631 | bond->alb_info.rx_slave = NULL; |
1da177e4 LT |
1632 | rlb_clear_slave(bond, slave); |
1633 | } | |
1634 | } | |
1635 | ||
1636 | /* Caller must hold bond lock for read */ | |
1637 | void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link) | |
1638 | { | |
1639 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1640 | ||
1641 | if (link == BOND_LINK_DOWN) { | |
1642 | tlb_clear_slave(bond, slave, 0); | |
1643 | if (bond->alb_info.rlb_enabled) { | |
1644 | rlb_clear_slave(bond, slave); | |
1645 | } | |
1646 | } else if (link == BOND_LINK_UP) { | |
1647 | /* order a rebalance ASAP */ | |
1648 | bond_info->tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS; | |
1649 | if (bond->alb_info.rlb_enabled) { | |
1650 | bond->alb_info.rlb_rebalance = 1; | |
1651 | /* If the updelay module parameter is smaller than the | |
1652 | * forwarding delay of the switch the rebalance will | |
1653 | * not work because the rebalance arp replies will | |
1654 | * not be forwarded to the clients.. | |
1655 | */ | |
1656 | } | |
1657 | } | |
1658 | } | |
1659 | ||
1660 | /** | |
1661 | * bond_alb_handle_active_change - assign new curr_active_slave | |
1662 | * @bond: our bonding struct | |
1663 | * @new_slave: new slave to assign | |
1664 | * | |
1665 | * Set the bond->curr_active_slave to @new_slave and handle | |
1666 | * mac address swapping and promiscuity changes as needed. | |
1667 | * | |
059fe7a5 JV |
1668 | * If new_slave is NULL, caller must hold curr_slave_lock or |
1669 | * bond->lock for write. | |
1670 | * | |
1671 | * If new_slave is not NULL, caller must hold RTNL, bond->lock for | |
1672 | * read and curr_slave_lock for write. Processing here may sleep, so | |
1673 | * no other locks may be held. | |
1da177e4 LT |
1674 | */ |
1675 | void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave) | |
1f78d9f9 HE |
1676 | __releases(&bond->curr_slave_lock) |
1677 | __releases(&bond->lock) | |
1678 | __acquires(&bond->lock) | |
1679 | __acquires(&bond->curr_slave_lock) | |
1da177e4 LT |
1680 | { |
1681 | struct slave *swap_slave; | |
1da177e4 | 1682 | |
dec1e90e | 1683 | if (bond->curr_active_slave == new_slave) |
1da177e4 | 1684 | return; |
1da177e4 LT |
1685 | |
1686 | if (bond->curr_active_slave && bond->alb_info.primary_is_promisc) { | |
1687 | dev_set_promiscuity(bond->curr_active_slave->dev, -1); | |
1688 | bond->alb_info.primary_is_promisc = 0; | |
1689 | bond->alb_info.rlb_promisc_timeout_counter = 0; | |
1690 | } | |
1691 | ||
1692 | swap_slave = bond->curr_active_slave; | |
278b2083 | 1693 | rcu_assign_pointer(bond->curr_active_slave, new_slave); |
1da177e4 | 1694 | |
0965a1f3 | 1695 | if (!new_slave || !bond_has_slaves(bond)) |
1da177e4 | 1696 | return; |
1da177e4 LT |
1697 | |
1698 | /* set the new curr_active_slave to the bonds mac address | |
1699 | * i.e. swap mac addresses of old curr_active_slave and new curr_active_slave | |
1700 | */ | |
b88ec38d VF |
1701 | if (!swap_slave) |
1702 | swap_slave = bond_slave_has_mac(bond, bond->dev->dev_addr); | |
1da177e4 | 1703 | |
059fe7a5 JV |
1704 | /* |
1705 | * Arrange for swap_slave and new_slave to temporarily be | |
1706 | * ignored so we can mess with their MAC addresses without | |
1707 | * fear of interference from transmit activity. | |
1708 | */ | |
dec1e90e | 1709 | if (swap_slave) |
059fe7a5 | 1710 | tlb_clear_slave(bond, swap_slave, 1); |
059fe7a5 JV |
1711 | tlb_clear_slave(bond, new_slave, 1); |
1712 | ||
1713 | write_unlock_bh(&bond->curr_slave_lock); | |
1714 | read_unlock(&bond->lock); | |
1715 | ||
e0138a66 JV |
1716 | ASSERT_RTNL(); |
1717 | ||
4996b909 VF |
1718 | /* in TLB mode, the slave might flip down/up with the old dev_addr, |
1719 | * and thus filter bond->dev_addr's packets, so force bond's mac | |
1720 | */ | |
1721 | if (bond->params.mode == BOND_MODE_TLB) { | |
1722 | struct sockaddr sa; | |
1723 | u8 tmp_addr[ETH_ALEN]; | |
1724 | ||
1725 | memcpy(tmp_addr, new_slave->dev->dev_addr, ETH_ALEN); | |
1726 | ||
1727 | memcpy(sa.sa_data, bond->dev->dev_addr, bond->dev->addr_len); | |
1728 | sa.sa_family = bond->dev->type; | |
1729 | /* we don't care if it can't change its mac, best effort */ | |
1730 | dev_set_mac_address(new_slave->dev, &sa); | |
1731 | ||
1732 | memcpy(new_slave->dev->dev_addr, tmp_addr, ETH_ALEN); | |
1733 | } | |
1734 | ||
1da177e4 LT |
1735 | /* curr_active_slave must be set before calling alb_swap_mac_addr */ |
1736 | if (swap_slave) { | |
1737 | /* swap mac address */ | |
43547ea6 | 1738 | alb_swap_mac_addr(swap_slave, new_slave); |
059fe7a5 | 1739 | alb_fasten_mac_swap(bond, swap_slave, new_slave); |
2543331d | 1740 | read_lock(&bond->lock); |
059fe7a5 | 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); | |
2543331d | 1744 | read_lock(&bond->lock); |
1da177e4 LT |
1745 | alb_send_learning_packets(new_slave, bond->dev->dev_addr); |
1746 | } | |
059fe7a5 JV |
1747 | |
1748 | write_lock_bh(&bond->curr_slave_lock); | |
1da177e4 LT |
1749 | } |
1750 | ||
059fe7a5 JV |
1751 | /* |
1752 | * Called with RTNL | |
1753 | */ | |
1da177e4 | 1754 | int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr) |
1f78d9f9 | 1755 | __acquires(&bond->lock) |
815bcc27 | 1756 | __releases(&bond->lock) |
1da177e4 | 1757 | { |
454d7c9b | 1758 | struct bonding *bond = netdev_priv(bond_dev); |
1da177e4 | 1759 | struct sockaddr *sa = addr; |
b88ec38d | 1760 | struct slave *swap_slave; |
1da177e4 | 1761 | int res; |
1da177e4 LT |
1762 | |
1763 | if (!is_valid_ether_addr(sa->sa_data)) { | |
1764 | return -EADDRNOTAVAIL; | |
1765 | } | |
1766 | ||
1767 | res = alb_set_mac_address(bond, addr); | |
1768 | if (res) { | |
1769 | return res; | |
1770 | } | |
1771 | ||
1772 | memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len); | |
1773 | ||
1774 | /* If there is no curr_active_slave there is nothing else to do. | |
1775 | * Otherwise we'll need to pass the new address to it and handle | |
1776 | * duplications. | |
1777 | */ | |
1778 | if (!bond->curr_active_slave) { | |
1779 | return 0; | |
1780 | } | |
1781 | ||
b88ec38d | 1782 | swap_slave = bond_slave_has_mac(bond, bond_dev->dev_addr); |
1da177e4 LT |
1783 | |
1784 | if (swap_slave) { | |
43547ea6 | 1785 | alb_swap_mac_addr(swap_slave, bond->curr_active_slave); |
059fe7a5 | 1786 | alb_fasten_mac_swap(bond, swap_slave, bond->curr_active_slave); |
1da177e4 | 1787 | } else { |
b924551b | 1788 | alb_set_slave_mac_addr(bond->curr_active_slave, bond_dev->dev_addr); |
1da177e4 | 1789 | |
815bcc27 | 1790 | read_lock(&bond->lock); |
1da177e4 LT |
1791 | alb_send_learning_packets(bond->curr_active_slave, bond_dev->dev_addr); |
1792 | if (bond->alb_info.rlb_enabled) { | |
1793 | /* inform clients mac address has changed */ | |
1794 | rlb_req_update_slave_clients(bond, bond->curr_active_slave); | |
1795 | } | |
815bcc27 | 1796 | read_unlock(&bond->lock); |
1da177e4 LT |
1797 | } |
1798 | ||
1799 | return 0; | |
1800 | } | |
1801 | ||
1802 | void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id) | |
1803 | { | |
1da177e4 LT |
1804 | if (bond->alb_info.rlb_enabled) { |
1805 | rlb_clear_vlan(bond, vlan_id); | |
1806 | } | |
1807 | } | |
1808 |