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 | ||
fdb89d75 | 96 | for (i = 0; i < hash_size; i++) |
1da177e4 | 97 | hash ^= hash_start[i]; |
1da177e4 LT |
98 | |
99 | return hash; | |
100 | } | |
101 | ||
102 | /*********************** tlb specific functions ***************************/ | |
103 | ||
f515e6b7 | 104 | static inline void _lock_tx_hashtbl_bh(struct bonding *bond) |
1da177e4 | 105 | { |
6603a6f2 | 106 | spin_lock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock)); |
1da177e4 LT |
107 | } |
108 | ||
f515e6b7 | 109 | static inline void _unlock_tx_hashtbl_bh(struct bonding *bond) |
1da177e4 | 110 | { |
6603a6f2 | 111 | spin_unlock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock)); |
1da177e4 LT |
112 | } |
113 | ||
f515e6b7 MU |
114 | static inline void _lock_tx_hashtbl(struct bonding *bond) |
115 | { | |
116 | spin_lock(&(BOND_ALB_INFO(bond).tx_hashtbl_lock)); | |
117 | } | |
118 | ||
119 | static inline void _unlock_tx_hashtbl(struct bonding *bond) | |
120 | { | |
121 | spin_unlock(&(BOND_ALB_INFO(bond).tx_hashtbl_lock)); | |
122 | } | |
123 | ||
1da177e4 LT |
124 | /* Caller must hold tx_hashtbl lock */ |
125 | static inline void tlb_init_table_entry(struct tlb_client_info *entry, int save_load) | |
126 | { | |
127 | if (save_load) { | |
128 | entry->load_history = 1 + entry->tx_bytes / | |
129 | BOND_TLB_REBALANCE_INTERVAL; | |
130 | entry->tx_bytes = 0; | |
131 | } | |
132 | ||
133 | entry->tx_slave = NULL; | |
134 | entry->next = TLB_NULL_INDEX; | |
135 | entry->prev = TLB_NULL_INDEX; | |
136 | } | |
137 | ||
138 | static inline void tlb_init_slave(struct slave *slave) | |
139 | { | |
140 | SLAVE_TLB_INFO(slave).load = 0; | |
141 | SLAVE_TLB_INFO(slave).head = TLB_NULL_INDEX; | |
142 | } | |
143 | ||
f515e6b7 MU |
144 | /* Caller must hold bond lock for read, BH disabled */ |
145 | static void __tlb_clear_slave(struct bonding *bond, struct slave *slave, | |
146 | int save_load) | |
1da177e4 LT |
147 | { |
148 | struct tlb_client_info *tx_hash_table; | |
149 | u32 index; | |
150 | ||
1da177e4 LT |
151 | /* clear slave from tx_hashtbl */ |
152 | tx_hash_table = BOND_ALB_INFO(bond).tx_hashtbl; | |
153 | ||
ce39a800 AG |
154 | /* skip this if we've already freed the tx hash table */ |
155 | if (tx_hash_table) { | |
156 | index = SLAVE_TLB_INFO(slave).head; | |
157 | while (index != TLB_NULL_INDEX) { | |
158 | u32 next_index = tx_hash_table[index].next; | |
159 | tlb_init_table_entry(&tx_hash_table[index], save_load); | |
160 | index = next_index; | |
161 | } | |
1da177e4 LT |
162 | } |
163 | ||
1da177e4 | 164 | tlb_init_slave(slave); |
f515e6b7 | 165 | } |
5af47b2f | 166 | |
f515e6b7 MU |
167 | /* Caller must hold bond lock for read */ |
168 | static void tlb_clear_slave(struct bonding *bond, struct slave *slave, | |
169 | int save_load) | |
170 | { | |
171 | _lock_tx_hashtbl_bh(bond); | |
172 | __tlb_clear_slave(bond, slave, save_load); | |
173 | _unlock_tx_hashtbl_bh(bond); | |
1da177e4 LT |
174 | } |
175 | ||
176 | /* Must be called before starting the monitor timer */ | |
177 | static int tlb_initialize(struct bonding *bond) | |
178 | { | |
179 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
180 | int size = TLB_HASH_TABLE_SIZE * sizeof(struct tlb_client_info); | |
0d206a3a | 181 | struct tlb_client_info *new_hashtbl; |
1da177e4 LT |
182 | int i; |
183 | ||
243cb4e5 | 184 | new_hashtbl = kzalloc(size, GFP_KERNEL); |
e404decb | 185 | if (!new_hashtbl) |
1da177e4 | 186 | return -1; |
e404decb | 187 | |
f515e6b7 | 188 | _lock_tx_hashtbl_bh(bond); |
0d206a3a MW |
189 | |
190 | bond_info->tx_hashtbl = new_hashtbl; | |
1da177e4 | 191 | |
fdb89d75 | 192 | for (i = 0; i < TLB_HASH_TABLE_SIZE; i++) |
38dbaf0a | 193 | tlb_init_table_entry(&bond_info->tx_hashtbl[i], 0); |
1da177e4 | 194 | |
f515e6b7 | 195 | _unlock_tx_hashtbl_bh(bond); |
1da177e4 LT |
196 | |
197 | return 0; | |
198 | } | |
199 | ||
200 | /* Must be called only after all slaves have been released */ | |
201 | static void tlb_deinitialize(struct bonding *bond) | |
202 | { | |
203 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
204 | ||
f515e6b7 | 205 | _lock_tx_hashtbl_bh(bond); |
1da177e4 LT |
206 | |
207 | kfree(bond_info->tx_hashtbl); | |
208 | bond_info->tx_hashtbl = NULL; | |
209 | ||
f515e6b7 | 210 | _unlock_tx_hashtbl_bh(bond); |
1da177e4 LT |
211 | } |
212 | ||
097811bb JP |
213 | static long long compute_gap(struct slave *slave) |
214 | { | |
215 | return (s64) (slave->speed << 20) - /* Convert to Megabit per sec */ | |
216 | (s64) (SLAVE_TLB_INFO(slave).load << 3); /* Bytes to bits */ | |
217 | } | |
218 | ||
1da177e4 LT |
219 | /* Caller must hold bond lock for read */ |
220 | static struct slave *tlb_get_least_loaded_slave(struct bonding *bond) | |
221 | { | |
222 | struct slave *slave, *least_loaded; | |
9caff1e7 | 223 | struct list_head *iter; |
097811bb | 224 | long long max_gap; |
1da177e4 | 225 | |
097811bb JP |
226 | least_loaded = NULL; |
227 | max_gap = LLONG_MIN; | |
1da177e4 LT |
228 | |
229 | /* Find the slave with the largest gap */ | |
28c71926 | 230 | bond_for_each_slave_rcu(bond, slave, iter) { |
1da177e4 | 231 | if (SLAVE_IS_OK(slave)) { |
097811bb JP |
232 | long long gap = compute_gap(slave); |
233 | ||
1da177e4 LT |
234 | if (max_gap < gap) { |
235 | least_loaded = slave; | |
236 | max_gap = gap; | |
237 | } | |
238 | } | |
239 | } | |
240 | ||
241 | return least_loaded; | |
242 | } | |
243 | ||
f515e6b7 MU |
244 | static struct slave *__tlb_choose_channel(struct bonding *bond, u32 hash_index, |
245 | u32 skb_len) | |
1da177e4 LT |
246 | { |
247 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
248 | struct tlb_client_info *hash_table; | |
249 | struct slave *assigned_slave; | |
250 | ||
1da177e4 LT |
251 | hash_table = bond_info->tx_hashtbl; |
252 | assigned_slave = hash_table[hash_index].tx_slave; | |
253 | if (!assigned_slave) { | |
254 | assigned_slave = tlb_get_least_loaded_slave(bond); | |
255 | ||
256 | if (assigned_slave) { | |
257 | struct tlb_slave_info *slave_info = | |
258 | &(SLAVE_TLB_INFO(assigned_slave)); | |
259 | u32 next_index = slave_info->head; | |
260 | ||
261 | hash_table[hash_index].tx_slave = assigned_slave; | |
262 | hash_table[hash_index].next = next_index; | |
263 | hash_table[hash_index].prev = TLB_NULL_INDEX; | |
264 | ||
fdb89d75 | 265 | if (next_index != TLB_NULL_INDEX) |
1da177e4 | 266 | hash_table[next_index].prev = hash_index; |
1da177e4 LT |
267 | |
268 | slave_info->head = hash_index; | |
269 | slave_info->load += | |
270 | hash_table[hash_index].load_history; | |
271 | } | |
272 | } | |
273 | ||
fdb89d75 | 274 | if (assigned_slave) |
1da177e4 | 275 | hash_table[hash_index].tx_bytes += skb_len; |
1da177e4 | 276 | |
1da177e4 LT |
277 | return assigned_slave; |
278 | } | |
279 | ||
f515e6b7 MU |
280 | /* Caller must hold bond lock for read */ |
281 | static struct slave *tlb_choose_channel(struct bonding *bond, u32 hash_index, | |
282 | u32 skb_len) | |
283 | { | |
284 | struct slave *tx_slave; | |
285 | /* | |
286 | * We don't need to disable softirq here, becase | |
287 | * tlb_choose_channel() is only called by bond_alb_xmit() | |
288 | * which already has softirq disabled. | |
289 | */ | |
290 | _lock_tx_hashtbl(bond); | |
291 | tx_slave = __tlb_choose_channel(bond, hash_index, skb_len); | |
292 | _unlock_tx_hashtbl(bond); | |
293 | return tx_slave; | |
294 | } | |
295 | ||
1da177e4 | 296 | /*********************** rlb specific functions ***************************/ |
f515e6b7 | 297 | static inline void _lock_rx_hashtbl_bh(struct bonding *bond) |
1da177e4 | 298 | { |
6603a6f2 | 299 | spin_lock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock)); |
1da177e4 LT |
300 | } |
301 | ||
f515e6b7 | 302 | static inline void _unlock_rx_hashtbl_bh(struct bonding *bond) |
1da177e4 | 303 | { |
6603a6f2 | 304 | spin_unlock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock)); |
1da177e4 LT |
305 | } |
306 | ||
f515e6b7 MU |
307 | static inline void _lock_rx_hashtbl(struct bonding *bond) |
308 | { | |
309 | spin_lock(&(BOND_ALB_INFO(bond).rx_hashtbl_lock)); | |
310 | } | |
311 | ||
312 | static inline void _unlock_rx_hashtbl(struct bonding *bond) | |
313 | { | |
314 | spin_unlock(&(BOND_ALB_INFO(bond).rx_hashtbl_lock)); | |
315 | } | |
316 | ||
1da177e4 LT |
317 | /* when an ARP REPLY is received from a client update its info |
318 | * in the rx_hashtbl | |
319 | */ | |
320 | static void rlb_update_entry_from_arp(struct bonding *bond, struct arp_pkt *arp) | |
321 | { | |
322 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
323 | struct rlb_client_info *client_info; | |
324 | u32 hash_index; | |
325 | ||
f515e6b7 | 326 | _lock_rx_hashtbl_bh(bond); |
1da177e4 | 327 | |
b85b6fb1 | 328 | hash_index = _simple_hash((u8 *)&(arp->ip_src), sizeof(arp->ip_src)); |
1da177e4 LT |
329 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
330 | ||
331 | if ((client_info->assigned) && | |
332 | (client_info->ip_src == arp->ip_dst) && | |
42d782ac | 333 | (client_info->ip_dst == arp->ip_src) && |
a6700db1 | 334 | (!ether_addr_equal_64bits(client_info->mac_dst, arp->mac_src))) { |
1da177e4 LT |
335 | /* update the clients MAC address */ |
336 | memcpy(client_info->mac_dst, arp->mac_src, ETH_ALEN); | |
337 | client_info->ntt = 1; | |
338 | bond_info->rx_ntt = 1; | |
339 | } | |
340 | ||
f515e6b7 | 341 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 LT |
342 | } |
343 | ||
de063b70 ED |
344 | static int rlb_arp_recv(const struct sk_buff *skb, struct bonding *bond, |
345 | struct slave *slave) | |
1da177e4 | 346 | { |
de063b70 | 347 | struct arp_pkt *arp, _arp; |
1da177e4 | 348 | |
3aba891d | 349 | if (skb->protocol != cpu_to_be16(ETH_P_ARP)) |
b99215cd | 350 | goto out; |
1da177e4 | 351 | |
de063b70 ED |
352 | arp = skb_header_pointer(skb, 0, sizeof(_arp), &_arp); |
353 | if (!arp) | |
b99215cd | 354 | goto out; |
1da177e4 | 355 | |
e53665c6 JB |
356 | /* We received an ARP from arp->ip_src. |
357 | * We might have used this IP address previously (on the bonding host | |
358 | * itself or on a system that is bridged together with the bond). | |
359 | * However, if arp->mac_src is different than what is stored in | |
360 | * rx_hashtbl, some other host is now using the IP and we must prevent | |
361 | * sending out client updates with this IP address and the old MAC | |
362 | * address. | |
363 | * Clean up all hash table entries that have this address as ip_src but | |
364 | * have a different mac_src. | |
365 | */ | |
366 | rlb_purge_src_ip(bond, arp); | |
367 | ||
1da177e4 LT |
368 | if (arp->op_code == htons(ARPOP_REPLY)) { |
369 | /* update rx hash table for this ARP */ | |
370 | rlb_update_entry_from_arp(bond, arp); | |
5a03cdb7 | 371 | pr_debug("Server received an ARP Reply from client\n"); |
1da177e4 | 372 | } |
b99215cd DM |
373 | out: |
374 | return RX_HANDLER_ANOTHER; | |
1da177e4 LT |
375 | } |
376 | ||
377 | /* Caller must hold bond lock for read */ | |
378 | static struct slave *rlb_next_rx_slave(struct bonding *bond) | |
379 | { | |
380 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
6475ae4c VF |
381 | struct slave *before = NULL, *rx_slave = NULL, *slave; |
382 | struct list_head *iter; | |
383 | bool found = false; | |
1da177e4 | 384 | |
6475ae4c VF |
385 | bond_for_each_slave(bond, slave, iter) { |
386 | if (!SLAVE_IS_OK(slave)) | |
387 | continue; | |
388 | if (!found) { | |
389 | if (!before || before->speed < slave->speed) | |
390 | before = slave; | |
391 | } else { | |
392 | if (!rx_slave || rx_slave->speed < slave->speed) | |
1da177e4 | 393 | rx_slave = slave; |
1da177e4 | 394 | } |
6475ae4c VF |
395 | if (slave == bond_info->rx_slave) |
396 | found = true; | |
1da177e4 | 397 | } |
6475ae4c VF |
398 | /* we didn't find anything after the current or we have something |
399 | * better before and up to the current slave | |
400 | */ | |
401 | if (!rx_slave || (before && rx_slave->speed < before->speed)) | |
402 | rx_slave = before; | |
1da177e4 | 403 | |
6475ae4c VF |
404 | if (rx_slave) |
405 | bond_info->rx_slave = rx_slave; | |
1da177e4 LT |
406 | |
407 | return rx_slave; | |
408 | } | |
409 | ||
28c71926 | 410 | /* Caller must hold rcu_read_lock() for read */ |
411 | static struct slave *__rlb_next_rx_slave(struct bonding *bond) | |
412 | { | |
413 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
414 | struct slave *before = NULL, *rx_slave = NULL, *slave; | |
415 | struct list_head *iter; | |
416 | bool found = false; | |
417 | ||
418 | bond_for_each_slave_rcu(bond, slave, iter) { | |
419 | if (!SLAVE_IS_OK(slave)) | |
420 | continue; | |
421 | if (!found) { | |
422 | if (!before || before->speed < slave->speed) | |
423 | before = slave; | |
424 | } else { | |
425 | if (!rx_slave || rx_slave->speed < slave->speed) | |
426 | rx_slave = slave; | |
427 | } | |
428 | if (slave == bond_info->rx_slave) | |
429 | found = true; | |
430 | } | |
431 | /* we didn't find anything after the current or we have something | |
432 | * better before and up to the current slave | |
433 | */ | |
434 | if (!rx_slave || (before && rx_slave->speed < before->speed)) | |
435 | rx_slave = before; | |
436 | ||
437 | if (rx_slave) | |
438 | bond_info->rx_slave = rx_slave; | |
439 | ||
440 | return rx_slave; | |
441 | } | |
442 | ||
1da177e4 LT |
443 | /* teach the switch the mac of a disabled slave |
444 | * on the primary for fault tolerance | |
445 | * | |
446 | * Caller must hold bond->curr_slave_lock for write or bond lock for write | |
447 | */ | |
448 | static void rlb_teach_disabled_mac_on_primary(struct bonding *bond, u8 addr[]) | |
449 | { | |
fdb89d75 | 450 | if (!bond->curr_active_slave) |
1da177e4 | 451 | return; |
1da177e4 LT |
452 | |
453 | if (!bond->alb_info.primary_is_promisc) { | |
7e1a1ac1 WC |
454 | if (!dev_set_promiscuity(bond->curr_active_slave->dev, 1)) |
455 | bond->alb_info.primary_is_promisc = 1; | |
456 | else | |
457 | bond->alb_info.primary_is_promisc = 0; | |
1da177e4 LT |
458 | } |
459 | ||
460 | bond->alb_info.rlb_promisc_timeout_counter = 0; | |
461 | ||
462 | alb_send_learning_packets(bond->curr_active_slave, addr); | |
463 | } | |
464 | ||
465 | /* slave being removed should not be active at this point | |
466 | * | |
b2e7aceb | 467 | * Caller must hold rtnl. |
1da177e4 LT |
468 | */ |
469 | static void rlb_clear_slave(struct bonding *bond, struct slave *slave) | |
470 | { | |
471 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
472 | struct rlb_client_info *rx_hash_table; | |
473 | u32 index, next_index; | |
474 | ||
475 | /* clear slave from rx_hashtbl */ | |
f515e6b7 | 476 | _lock_rx_hashtbl_bh(bond); |
1da177e4 LT |
477 | |
478 | rx_hash_table = bond_info->rx_hashtbl; | |
e53665c6 | 479 | index = bond_info->rx_hashtbl_used_head; |
1da177e4 | 480 | for (; index != RLB_NULL_INDEX; index = next_index) { |
e53665c6 | 481 | next_index = rx_hash_table[index].used_next; |
1da177e4 LT |
482 | if (rx_hash_table[index].slave == slave) { |
483 | struct slave *assigned_slave = rlb_next_rx_slave(bond); | |
484 | ||
485 | if (assigned_slave) { | |
486 | rx_hash_table[index].slave = assigned_slave; | |
a6700db1 JP |
487 | if (!ether_addr_equal_64bits(rx_hash_table[index].mac_dst, |
488 | mac_bcast)) { | |
1da177e4 LT |
489 | bond_info->rx_hashtbl[index].ntt = 1; |
490 | bond_info->rx_ntt = 1; | |
491 | /* A slave has been removed from the | |
492 | * table because it is either disabled | |
493 | * or being released. We must retry the | |
494 | * update to avoid clients from not | |
495 | * being updated & disconnecting when | |
496 | * there is stress | |
497 | */ | |
498 | bond_info->rlb_update_retry_counter = | |
499 | RLB_UPDATE_RETRY; | |
500 | } | |
501 | } else { /* there is no active slave */ | |
502 | rx_hash_table[index].slave = NULL; | |
503 | } | |
504 | } | |
505 | } | |
506 | ||
f515e6b7 | 507 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 | 508 | |
6603a6f2 | 509 | write_lock_bh(&bond->curr_slave_lock); |
1da177e4 | 510 | |
fdb89d75 | 511 | if (slave != bond->curr_active_slave) |
1da177e4 | 512 | rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr); |
1da177e4 | 513 | |
6603a6f2 | 514 | write_unlock_bh(&bond->curr_slave_lock); |
1da177e4 LT |
515 | } |
516 | ||
517 | static void rlb_update_client(struct rlb_client_info *client_info) | |
518 | { | |
519 | int i; | |
520 | ||
521 | if (!client_info->slave) { | |
522 | return; | |
523 | } | |
524 | ||
525 | for (i = 0; i < RLB_ARP_BURST_SIZE; i++) { | |
526 | struct sk_buff *skb; | |
527 | ||
528 | skb = arp_create(ARPOP_REPLY, ETH_P_ARP, | |
529 | client_info->ip_dst, | |
530 | client_info->slave->dev, | |
531 | client_info->ip_src, | |
532 | client_info->mac_dst, | |
533 | client_info->slave->dev->dev_addr, | |
534 | client_info->mac_dst); | |
535 | if (!skb) { | |
a4aee5c8 | 536 | pr_err("%s: Error: failed to create an ARP packet\n", |
471cb5a3 | 537 | client_info->slave->bond->dev->name); |
1da177e4 LT |
538 | continue; |
539 | } | |
540 | ||
541 | skb->dev = client_info->slave->dev; | |
542 | ||
d3ab3ffd | 543 | if (client_info->vlan_id) { |
86a9bad3 | 544 | skb = vlan_put_tag(skb, htons(ETH_P_8021Q), client_info->vlan_id); |
1da177e4 | 545 | if (!skb) { |
a4aee5c8 | 546 | pr_err("%s: Error: failed to insert VLAN tag\n", |
471cb5a3 | 547 | client_info->slave->bond->dev->name); |
1da177e4 LT |
548 | continue; |
549 | } | |
550 | } | |
551 | ||
552 | arp_xmit(skb); | |
553 | } | |
554 | } | |
555 | ||
556 | /* sends ARP REPLIES that update the clients that need updating */ | |
557 | static void rlb_update_rx_clients(struct bonding *bond) | |
558 | { | |
559 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
560 | struct rlb_client_info *client_info; | |
561 | u32 hash_index; | |
562 | ||
f515e6b7 | 563 | _lock_rx_hashtbl_bh(bond); |
1da177e4 | 564 | |
e53665c6 JB |
565 | hash_index = bond_info->rx_hashtbl_used_head; |
566 | for (; hash_index != RLB_NULL_INDEX; | |
567 | hash_index = client_info->used_next) { | |
1da177e4 LT |
568 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
569 | if (client_info->ntt) { | |
570 | rlb_update_client(client_info); | |
571 | if (bond_info->rlb_update_retry_counter == 0) { | |
572 | client_info->ntt = 0; | |
573 | } | |
574 | } | |
575 | } | |
576 | ||
94e2bd68 | 577 | /* do not update the entries again until this counter is zero so that |
1da177e4 LT |
578 | * not to confuse the clients. |
579 | */ | |
580 | bond_info->rlb_update_delay_counter = RLB_UPDATE_DELAY; | |
581 | ||
f515e6b7 | 582 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 LT |
583 | } |
584 | ||
585 | /* The slave was assigned a new mac address - update the clients */ | |
586 | static void rlb_req_update_slave_clients(struct bonding *bond, struct slave *slave) | |
587 | { | |
588 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
589 | struct rlb_client_info *client_info; | |
590 | int ntt = 0; | |
591 | u32 hash_index; | |
592 | ||
f515e6b7 | 593 | _lock_rx_hashtbl_bh(bond); |
1da177e4 | 594 | |
e53665c6 JB |
595 | hash_index = bond_info->rx_hashtbl_used_head; |
596 | for (; hash_index != RLB_NULL_INDEX; | |
597 | hash_index = client_info->used_next) { | |
1da177e4 LT |
598 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
599 | ||
600 | if ((client_info->slave == slave) && | |
a6700db1 | 601 | !ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) { |
1da177e4 LT |
602 | client_info->ntt = 1; |
603 | ntt = 1; | |
604 | } | |
605 | } | |
606 | ||
4708a1b1 | 607 | /* update the team's flag only after the whole iteration */ |
1da177e4 LT |
608 | if (ntt) { |
609 | bond_info->rx_ntt = 1; | |
4708a1b1 | 610 | /* fasten the change */ |
1da177e4 LT |
611 | bond_info->rlb_update_retry_counter = RLB_UPDATE_RETRY; |
612 | } | |
613 | ||
f515e6b7 | 614 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 LT |
615 | } |
616 | ||
617 | /* mark all clients using src_ip to be updated */ | |
d3bb52b0 | 618 | static void rlb_req_update_subnet_clients(struct bonding *bond, __be32 src_ip) |
1da177e4 LT |
619 | { |
620 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
621 | struct rlb_client_info *client_info; | |
622 | u32 hash_index; | |
623 | ||
624 | _lock_rx_hashtbl(bond); | |
625 | ||
e53665c6 JB |
626 | hash_index = bond_info->rx_hashtbl_used_head; |
627 | for (; hash_index != RLB_NULL_INDEX; | |
628 | hash_index = client_info->used_next) { | |
1da177e4 LT |
629 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
630 | ||
631 | if (!client_info->slave) { | |
a4aee5c8 | 632 | pr_err("%s: Error: found a client with no channel in the client's hash table\n", |
4e0952c7 | 633 | bond->dev->name); |
1da177e4 LT |
634 | continue; |
635 | } | |
636 | /*update all clients using this src_ip, that are not assigned | |
637 | * to the team's address (curr_active_slave) and have a known | |
638 | * unicast mac address. | |
639 | */ | |
640 | if ((client_info->ip_src == src_ip) && | |
a6700db1 JP |
641 | !ether_addr_equal_64bits(client_info->slave->dev->dev_addr, |
642 | bond->dev->dev_addr) && | |
643 | !ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) { | |
1da177e4 LT |
644 | client_info->ntt = 1; |
645 | bond_info->rx_ntt = 1; | |
646 | } | |
647 | } | |
648 | ||
649 | _unlock_rx_hashtbl(bond); | |
650 | } | |
651 | ||
652 | /* Caller must hold both bond and ptr locks for read */ | |
653 | static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bond) | |
654 | { | |
655 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
a16aeb36 | 656 | struct arp_pkt *arp = arp_pkt(skb); |
28c71926 | 657 | struct slave *assigned_slave, *curr_active_slave; |
1da177e4 LT |
658 | struct rlb_client_info *client_info; |
659 | u32 hash_index = 0; | |
660 | ||
661 | _lock_rx_hashtbl(bond); | |
662 | ||
28c71926 | 663 | curr_active_slave = rcu_dereference(bond->curr_active_slave); |
664 | ||
e364a341 | 665 | hash_index = _simple_hash((u8 *)&arp->ip_dst, sizeof(arp->ip_dst)); |
1da177e4 LT |
666 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
667 | ||
668 | if (client_info->assigned) { | |
669 | if ((client_info->ip_src == arp->ip_src) && | |
670 | (client_info->ip_dst == arp->ip_dst)) { | |
671 | /* the entry is already assigned to this client */ | |
a6700db1 | 672 | if (!ether_addr_equal_64bits(arp->mac_dst, mac_bcast)) { |
1da177e4 LT |
673 | /* update mac address from arp */ |
674 | memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN); | |
675 | } | |
e53665c6 | 676 | memcpy(client_info->mac_src, arp->mac_src, ETH_ALEN); |
1da177e4 LT |
677 | |
678 | assigned_slave = client_info->slave; | |
679 | if (assigned_slave) { | |
680 | _unlock_rx_hashtbl(bond); | |
681 | return assigned_slave; | |
682 | } | |
683 | } else { | |
684 | /* the entry is already assigned to some other client, | |
685 | * move the old client to primary (curr_active_slave) so | |
686 | * that the new client can be assigned to this entry. | |
687 | */ | |
688 | if (bond->curr_active_slave && | |
28c71926 | 689 | client_info->slave != curr_active_slave) { |
690 | client_info->slave = curr_active_slave; | |
1da177e4 LT |
691 | rlb_update_client(client_info); |
692 | } | |
693 | } | |
694 | } | |
695 | /* assign a new slave */ | |
28c71926 | 696 | assigned_slave = __rlb_next_rx_slave(bond); |
1da177e4 LT |
697 | |
698 | if (assigned_slave) { | |
e53665c6 JB |
699 | if (!(client_info->assigned && |
700 | client_info->ip_src == arp->ip_src)) { | |
701 | /* ip_src is going to be updated, | |
702 | * fix the src hash list | |
703 | */ | |
704 | u32 hash_src = _simple_hash((u8 *)&arp->ip_src, | |
705 | sizeof(arp->ip_src)); | |
706 | rlb_src_unlink(bond, hash_index); | |
707 | rlb_src_link(bond, hash_src, hash_index); | |
708 | } | |
709 | ||
1da177e4 LT |
710 | client_info->ip_src = arp->ip_src; |
711 | client_info->ip_dst = arp->ip_dst; | |
712 | /* arp->mac_dst is broadcast for arp reqeusts. | |
713 | * will be updated with clients actual unicast mac address | |
714 | * upon receiving an arp reply. | |
715 | */ | |
716 | memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN); | |
e53665c6 | 717 | memcpy(client_info->mac_src, arp->mac_src, ETH_ALEN); |
1da177e4 LT |
718 | client_info->slave = assigned_slave; |
719 | ||
a6700db1 | 720 | if (!ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) { |
1da177e4 LT |
721 | client_info->ntt = 1; |
722 | bond->alb_info.rx_ntt = 1; | |
723 | } else { | |
724 | client_info->ntt = 0; | |
725 | } | |
726 | ||
6f477d42 | 727 | if (!vlan_get_tag(skb, &client_info->vlan_id)) |
d3ab3ffd | 728 | client_info->vlan_id = 0; |
1da177e4 LT |
729 | |
730 | if (!client_info->assigned) { | |
e53665c6 JB |
731 | u32 prev_tbl_head = bond_info->rx_hashtbl_used_head; |
732 | bond_info->rx_hashtbl_used_head = hash_index; | |
733 | client_info->used_next = prev_tbl_head; | |
1da177e4 | 734 | if (prev_tbl_head != RLB_NULL_INDEX) { |
e53665c6 | 735 | bond_info->rx_hashtbl[prev_tbl_head].used_prev = |
1da177e4 LT |
736 | hash_index; |
737 | } | |
738 | client_info->assigned = 1; | |
739 | } | |
740 | } | |
741 | ||
742 | _unlock_rx_hashtbl(bond); | |
743 | ||
744 | return assigned_slave; | |
745 | } | |
746 | ||
747 | /* chooses (and returns) transmit channel for arp reply | |
748 | * does not choose channel for other arp types since they are | |
749 | * sent on the curr_active_slave | |
750 | */ | |
751 | static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond) | |
752 | { | |
a16aeb36 | 753 | struct arp_pkt *arp = arp_pkt(skb); |
1da177e4 LT |
754 | struct slave *tx_slave = NULL; |
755 | ||
567b871e | 756 | /* Don't modify or load balance ARPs that do not originate locally |
757 | * (e.g.,arrive via a bridge). | |
758 | */ | |
28c71926 | 759 | if (!bond_slave_has_mac_rcu(bond, arp->mac_src)) |
567b871e | 760 | return NULL; |
761 | ||
f14c4e4e | 762 | if (arp->op_code == htons(ARPOP_REPLY)) { |
1da177e4 LT |
763 | /* the arp must be sent on the selected |
764 | * rx channel | |
765 | */ | |
766 | tx_slave = rlb_choose_channel(skb, bond); | |
767 | if (tx_slave) { | |
4708a1b1 | 768 | memcpy(arp->mac_src, tx_slave->dev->dev_addr, ETH_ALEN); |
1da177e4 | 769 | } |
5a03cdb7 | 770 | pr_debug("Server sent ARP Reply packet\n"); |
f14c4e4e | 771 | } else if (arp->op_code == htons(ARPOP_REQUEST)) { |
1da177e4 LT |
772 | /* Create an entry in the rx_hashtbl for this client as a |
773 | * place holder. | |
774 | * When the arp reply is received the entry will be updated | |
775 | * with the correct unicast address of the client. | |
776 | */ | |
777 | rlb_choose_channel(skb, bond); | |
778 | ||
77c8e2c0 | 779 | /* The ARP reply packets must be delayed so that |
1da177e4 LT |
780 | * they can cancel out the influence of the ARP request. |
781 | */ | |
782 | bond->alb_info.rlb_update_delay_counter = RLB_UPDATE_DELAY; | |
783 | ||
784 | /* arp requests are broadcast and are sent on the primary | |
785 | * the arp request will collapse all clients on the subnet to | |
786 | * the primary slave. We must register these clients to be | |
787 | * updated with their assigned mac. | |
788 | */ | |
789 | rlb_req_update_subnet_clients(bond, arp->ip_src); | |
5a03cdb7 | 790 | pr_debug("Server sent ARP Request packet\n"); |
1da177e4 LT |
791 | } |
792 | ||
793 | return tx_slave; | |
794 | } | |
795 | ||
796 | /* Caller must hold bond lock for read */ | |
797 | static void rlb_rebalance(struct bonding *bond) | |
798 | { | |
799 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
800 | struct slave *assigned_slave; | |
801 | struct rlb_client_info *client_info; | |
802 | int ntt; | |
803 | u32 hash_index; | |
804 | ||
f515e6b7 | 805 | _lock_rx_hashtbl_bh(bond); |
1da177e4 LT |
806 | |
807 | ntt = 0; | |
e53665c6 JB |
808 | hash_index = bond_info->rx_hashtbl_used_head; |
809 | for (; hash_index != RLB_NULL_INDEX; | |
810 | hash_index = client_info->used_next) { | |
1da177e4 | 811 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
733ab639 | 812 | assigned_slave = __rlb_next_rx_slave(bond); |
1da177e4 LT |
813 | if (assigned_slave && (client_info->slave != assigned_slave)) { |
814 | client_info->slave = assigned_slave; | |
815 | client_info->ntt = 1; | |
816 | ntt = 1; | |
817 | } | |
818 | } | |
819 | ||
820 | /* update the team's flag only after the whole iteration */ | |
821 | if (ntt) { | |
822 | bond_info->rx_ntt = 1; | |
823 | } | |
f515e6b7 | 824 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 LT |
825 | } |
826 | ||
827 | /* Caller must hold rx_hashtbl lock */ | |
e53665c6 JB |
828 | static void rlb_init_table_entry_dst(struct rlb_client_info *entry) |
829 | { | |
830 | entry->used_next = RLB_NULL_INDEX; | |
831 | entry->used_prev = RLB_NULL_INDEX; | |
832 | entry->assigned = 0; | |
833 | entry->slave = NULL; | |
d3ab3ffd | 834 | entry->vlan_id = 0; |
e53665c6 JB |
835 | } |
836 | static void rlb_init_table_entry_src(struct rlb_client_info *entry) | |
837 | { | |
838 | entry->src_first = RLB_NULL_INDEX; | |
839 | entry->src_prev = RLB_NULL_INDEX; | |
840 | entry->src_next = RLB_NULL_INDEX; | |
841 | } | |
842 | ||
1da177e4 LT |
843 | static void rlb_init_table_entry(struct rlb_client_info *entry) |
844 | { | |
845 | memset(entry, 0, sizeof(struct rlb_client_info)); | |
e53665c6 JB |
846 | rlb_init_table_entry_dst(entry); |
847 | rlb_init_table_entry_src(entry); | |
848 | } | |
849 | ||
850 | static void rlb_delete_table_entry_dst(struct bonding *bond, u32 index) | |
851 | { | |
852 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
853 | u32 next_index = bond_info->rx_hashtbl[index].used_next; | |
854 | u32 prev_index = bond_info->rx_hashtbl[index].used_prev; | |
855 | ||
856 | if (index == bond_info->rx_hashtbl_used_head) | |
857 | bond_info->rx_hashtbl_used_head = next_index; | |
858 | if (prev_index != RLB_NULL_INDEX) | |
859 | bond_info->rx_hashtbl[prev_index].used_next = next_index; | |
860 | if (next_index != RLB_NULL_INDEX) | |
861 | bond_info->rx_hashtbl[next_index].used_prev = prev_index; | |
862 | } | |
863 | ||
864 | /* unlink a rlb hash table entry from the src list */ | |
865 | static void rlb_src_unlink(struct bonding *bond, u32 index) | |
866 | { | |
867 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
868 | u32 next_index = bond_info->rx_hashtbl[index].src_next; | |
869 | u32 prev_index = bond_info->rx_hashtbl[index].src_prev; | |
870 | ||
871 | bond_info->rx_hashtbl[index].src_next = RLB_NULL_INDEX; | |
872 | bond_info->rx_hashtbl[index].src_prev = RLB_NULL_INDEX; | |
873 | ||
874 | if (next_index != RLB_NULL_INDEX) | |
875 | bond_info->rx_hashtbl[next_index].src_prev = prev_index; | |
876 | ||
877 | if (prev_index == RLB_NULL_INDEX) | |
878 | return; | |
879 | ||
880 | /* is prev_index pointing to the head of this list? */ | |
881 | if (bond_info->rx_hashtbl[prev_index].src_first == index) | |
882 | bond_info->rx_hashtbl[prev_index].src_first = next_index; | |
883 | else | |
884 | bond_info->rx_hashtbl[prev_index].src_next = next_index; | |
885 | ||
886 | } | |
887 | ||
888 | static void rlb_delete_table_entry(struct bonding *bond, u32 index) | |
889 | { | |
890 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
891 | struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]); | |
892 | ||
893 | rlb_delete_table_entry_dst(bond, index); | |
894 | rlb_init_table_entry_dst(entry); | |
895 | ||
896 | rlb_src_unlink(bond, index); | |
897 | } | |
898 | ||
899 | /* add the rx_hashtbl[ip_dst_hash] entry to the list | |
900 | * of entries with identical ip_src_hash | |
901 | */ | |
902 | static void rlb_src_link(struct bonding *bond, u32 ip_src_hash, u32 ip_dst_hash) | |
903 | { | |
904 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
905 | u32 next; | |
906 | ||
907 | bond_info->rx_hashtbl[ip_dst_hash].src_prev = ip_src_hash; | |
908 | next = bond_info->rx_hashtbl[ip_src_hash].src_first; | |
909 | bond_info->rx_hashtbl[ip_dst_hash].src_next = next; | |
910 | if (next != RLB_NULL_INDEX) | |
911 | bond_info->rx_hashtbl[next].src_prev = ip_dst_hash; | |
912 | bond_info->rx_hashtbl[ip_src_hash].src_first = ip_dst_hash; | |
913 | } | |
914 | ||
915 | /* deletes all rx_hashtbl entries with arp->ip_src if their mac_src does | |
916 | * not match arp->mac_src */ | |
917 | static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp) | |
918 | { | |
919 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
b85b6fb1 | 920 | u32 ip_src_hash = _simple_hash((u8 *)&(arp->ip_src), sizeof(arp->ip_src)); |
e53665c6 JB |
921 | u32 index; |
922 | ||
923 | _lock_rx_hashtbl_bh(bond); | |
924 | ||
925 | index = bond_info->rx_hashtbl[ip_src_hash].src_first; | |
926 | while (index != RLB_NULL_INDEX) { | |
927 | struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]); | |
928 | u32 next_index = entry->src_next; | |
929 | if (entry->ip_src == arp->ip_src && | |
930 | !ether_addr_equal_64bits(arp->mac_src, entry->mac_src)) | |
931 | rlb_delete_table_entry(bond, index); | |
932 | index = next_index; | |
933 | } | |
934 | _unlock_rx_hashtbl_bh(bond); | |
1da177e4 LT |
935 | } |
936 | ||
937 | static int rlb_initialize(struct bonding *bond) | |
938 | { | |
939 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
0d206a3a | 940 | struct rlb_client_info *new_hashtbl; |
1da177e4 LT |
941 | int size = RLB_HASH_TABLE_SIZE * sizeof(struct rlb_client_info); |
942 | int i; | |
943 | ||
0d206a3a | 944 | new_hashtbl = kmalloc(size, GFP_KERNEL); |
e404decb | 945 | if (!new_hashtbl) |
1da177e4 | 946 | return -1; |
e404decb | 947 | |
f515e6b7 | 948 | _lock_rx_hashtbl_bh(bond); |
0d206a3a MW |
949 | |
950 | bond_info->rx_hashtbl = new_hashtbl; | |
1da177e4 | 951 | |
e53665c6 | 952 | bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX; |
1da177e4 LT |
953 | |
954 | for (i = 0; i < RLB_HASH_TABLE_SIZE; i++) { | |
955 | rlb_init_table_entry(bond_info->rx_hashtbl + i); | |
956 | } | |
957 | ||
f515e6b7 | 958 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 | 959 | |
1da177e4 | 960 | /* register to receive ARPs */ |
3aba891d | 961 | bond->recv_probe = rlb_arp_recv; |
1da177e4 LT |
962 | |
963 | return 0; | |
964 | } | |
965 | ||
966 | static void rlb_deinitialize(struct bonding *bond) | |
967 | { | |
968 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
969 | ||
f515e6b7 | 970 | _lock_rx_hashtbl_bh(bond); |
1da177e4 LT |
971 | |
972 | kfree(bond_info->rx_hashtbl); | |
973 | bond_info->rx_hashtbl = NULL; | |
e53665c6 | 974 | bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX; |
1da177e4 | 975 | |
f515e6b7 | 976 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 LT |
977 | } |
978 | ||
979 | static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id) | |
980 | { | |
981 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
982 | u32 curr_index; | |
983 | ||
f515e6b7 | 984 | _lock_rx_hashtbl_bh(bond); |
1da177e4 | 985 | |
e53665c6 | 986 | curr_index = bond_info->rx_hashtbl_used_head; |
1da177e4 LT |
987 | while (curr_index != RLB_NULL_INDEX) { |
988 | struct rlb_client_info *curr = &(bond_info->rx_hashtbl[curr_index]); | |
e53665c6 | 989 | u32 next_index = bond_info->rx_hashtbl[curr_index].used_next; |
1da177e4 | 990 | |
d3ab3ffd | 991 | if (curr->vlan_id == vlan_id) |
e53665c6 | 992 | rlb_delete_table_entry(bond, curr_index); |
1da177e4 LT |
993 | |
994 | curr_index = next_index; | |
995 | } | |
996 | ||
f515e6b7 | 997 | _unlock_rx_hashtbl_bh(bond); |
1da177e4 LT |
998 | } |
999 | ||
1000 | /*********************** tlb/rlb shared functions *********************/ | |
1001 | ||
7aa64981 VF |
1002 | static void alb_send_lp_vid(struct slave *slave, u8 mac_addr[], |
1003 | u16 vid) | |
1da177e4 | 1004 | { |
1da177e4 | 1005 | struct learning_pkt pkt; |
7aa64981 | 1006 | struct sk_buff *skb; |
1da177e4 | 1007 | int size = sizeof(struct learning_pkt); |
7aa64981 | 1008 | char *data; |
1da177e4 LT |
1009 | |
1010 | memset(&pkt, 0, size); | |
1011 | memcpy(pkt.mac_dst, mac_addr, ETH_ALEN); | |
1012 | memcpy(pkt.mac_src, mac_addr, ETH_ALEN); | |
09640e63 | 1013 | pkt.type = cpu_to_be16(ETH_P_LOOP); |
1da177e4 | 1014 | |
7aa64981 VF |
1015 | skb = dev_alloc_skb(size); |
1016 | if (!skb) | |
1017 | return; | |
1da177e4 | 1018 | |
7aa64981 VF |
1019 | data = skb_put(skb, size); |
1020 | memcpy(data, &pkt, size); | |
1021 | ||
1022 | skb_reset_mac_header(skb); | |
1023 | skb->network_header = skb->mac_header + ETH_HLEN; | |
1024 | skb->protocol = pkt.type; | |
1025 | skb->priority = TC_PRIO_CONTROL; | |
1026 | skb->dev = slave->dev; | |
1027 | ||
1028 | if (vid) { | |
1029 | skb = vlan_put_tag(skb, htons(ETH_P_8021Q), vid); | |
1da177e4 | 1030 | if (!skb) { |
7aa64981 VF |
1031 | pr_err("%s: Error: failed to insert VLAN tag\n", |
1032 | slave->bond->dev->name); | |
1da177e4 LT |
1033 | return; |
1034 | } | |
7aa64981 VF |
1035 | } |
1036 | ||
1037 | dev_queue_xmit(skb); | |
1038 | } | |
1da177e4 | 1039 | |
1da177e4 | 1040 | |
7aa64981 VF |
1041 | static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[]) |
1042 | { | |
1043 | struct bonding *bond = bond_get_bond_by_slave(slave); | |
5bf94b83 VF |
1044 | struct net_device *upper; |
1045 | struct list_head *iter; | |
1046 | ||
1047 | /* send untagged */ | |
1048 | alb_send_lp_vid(slave, mac_addr, 0); | |
1049 | ||
1050 | /* loop through vlans and send one packet for each */ | |
1051 | rcu_read_lock(); | |
2f268f12 | 1052 | netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) { |
5bf94b83 VF |
1053 | if (upper->priv_flags & IFF_802_1Q_VLAN) |
1054 | alb_send_lp_vid(slave, mac_addr, | |
1055 | vlan_dev_vlan_id(upper)); | |
1da177e4 | 1056 | } |
5bf94b83 | 1057 | rcu_read_unlock(); |
1da177e4 LT |
1058 | } |
1059 | ||
b924551b | 1060 | static int alb_set_slave_mac_addr(struct slave *slave, u8 addr[]) |
1da177e4 LT |
1061 | { |
1062 | struct net_device *dev = slave->dev; | |
1063 | struct sockaddr s_addr; | |
1064 | ||
b924551b | 1065 | if (slave->bond->params.mode == BOND_MODE_TLB) { |
1da177e4 LT |
1066 | memcpy(dev->dev_addr, addr, dev->addr_len); |
1067 | return 0; | |
1068 | } | |
1069 | ||
1070 | /* for rlb each slave must have a unique hw mac addresses so that */ | |
1071 | /* each slave will receive packets destined to a different mac */ | |
1072 | memcpy(s_addr.sa_data, addr, dev->addr_len); | |
1073 | s_addr.sa_family = dev->type; | |
1074 | if (dev_set_mac_address(dev, &s_addr)) { | |
a4aee5c8 JP |
1075 | pr_err("%s: Error: dev_set_mac_address of dev %s failed!\n" |
1076 | "ALB mode requires that the base driver support setting the hw address also when the network device's interface is open\n", | |
471cb5a3 | 1077 | slave->bond->dev->name, dev->name); |
1da177e4 LT |
1078 | return -EOPNOTSUPP; |
1079 | } | |
1080 | return 0; | |
1081 | } | |
1082 | ||
059fe7a5 JV |
1083 | /* |
1084 | * Swap MAC addresses between two slaves. | |
1085 | * | |
1086 | * Called with RTNL held, and no other locks. | |
1087 | * | |
1088 | */ | |
1089 | ||
43547ea6 | 1090 | static void alb_swap_mac_addr(struct slave *slave1, struct slave *slave2) |
1da177e4 | 1091 | { |
1da177e4 | 1092 | u8 tmp_mac_addr[ETH_ALEN]; |
1da177e4 LT |
1093 | |
1094 | memcpy(tmp_mac_addr, slave1->dev->dev_addr, ETH_ALEN); | |
b924551b JB |
1095 | alb_set_slave_mac_addr(slave1, slave2->dev->dev_addr); |
1096 | alb_set_slave_mac_addr(slave2, tmp_mac_addr); | |
1da177e4 | 1097 | |
059fe7a5 JV |
1098 | } |
1099 | ||
1100 | /* | |
1101 | * Send learning packets after MAC address swap. | |
1102 | * | |
2543331d | 1103 | * Called with RTNL and no other locks |
059fe7a5 JV |
1104 | */ |
1105 | static void alb_fasten_mac_swap(struct bonding *bond, struct slave *slave1, | |
1106 | struct slave *slave2) | |
1107 | { | |
1108 | int slaves_state_differ = (SLAVE_IS_OK(slave1) != SLAVE_IS_OK(slave2)); | |
1109 | struct slave *disabled_slave = NULL; | |
1110 | ||
2543331d JV |
1111 | ASSERT_RTNL(); |
1112 | ||
1da177e4 LT |
1113 | /* fasten the change in the switch */ |
1114 | if (SLAVE_IS_OK(slave1)) { | |
1115 | alb_send_learning_packets(slave1, slave1->dev->dev_addr); | |
1116 | if (bond->alb_info.rlb_enabled) { | |
1117 | /* inform the clients that the mac address | |
1118 | * has changed | |
1119 | */ | |
1120 | rlb_req_update_slave_clients(bond, slave1); | |
1121 | } | |
1122 | } else { | |
1123 | disabled_slave = slave1; | |
1124 | } | |
1125 | ||
1126 | if (SLAVE_IS_OK(slave2)) { | |
1127 | alb_send_learning_packets(slave2, slave2->dev->dev_addr); | |
1128 | if (bond->alb_info.rlb_enabled) { | |
1129 | /* inform the clients that the mac address | |
1130 | * has changed | |
1131 | */ | |
1132 | rlb_req_update_slave_clients(bond, slave2); | |
1133 | } | |
1134 | } else { | |
1135 | disabled_slave = slave2; | |
1136 | } | |
1137 | ||
1138 | if (bond->alb_info.rlb_enabled && slaves_state_differ) { | |
1139 | /* A disabled slave was assigned an active mac addr */ | |
1140 | rlb_teach_disabled_mac_on_primary(bond, | |
1141 | disabled_slave->dev->dev_addr); | |
1142 | } | |
1143 | } | |
1144 | ||
1145 | /** | |
1146 | * alb_change_hw_addr_on_detach | |
1147 | * @bond: bonding we're working on | |
1148 | * @slave: the slave that was just detached | |
1149 | * | |
1150 | * We assume that @slave was already detached from the slave list. | |
1151 | * | |
1152 | * If @slave's permanent hw address is different both from its current | |
1153 | * address and from @bond's address, then somewhere in the bond there's | |
1154 | * a slave that has @slave's permanet address as its current address. | |
1155 | * We'll make sure that that slave no longer uses @slave's permanent address. | |
1156 | * | |
2543331d | 1157 | * Caller must hold RTNL and no other locks |
1da177e4 LT |
1158 | */ |
1159 | static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *slave) | |
1160 | { | |
1161 | int perm_curr_diff; | |
1162 | int perm_bond_diff; | |
b88ec38d | 1163 | struct slave *found_slave; |
1da177e4 | 1164 | |
a6700db1 JP |
1165 | perm_curr_diff = !ether_addr_equal_64bits(slave->perm_hwaddr, |
1166 | slave->dev->dev_addr); | |
1167 | perm_bond_diff = !ether_addr_equal_64bits(slave->perm_hwaddr, | |
1168 | bond->dev->dev_addr); | |
1da177e4 LT |
1169 | |
1170 | if (perm_curr_diff && perm_bond_diff) { | |
b88ec38d | 1171 | found_slave = bond_slave_has_mac(bond, slave->perm_hwaddr); |
1da177e4 | 1172 | |
b88ec38d | 1173 | if (found_slave) { |
059fe7a5 | 1174 | /* locking: needs RTNL and nothing else */ |
b88ec38d VF |
1175 | alb_swap_mac_addr(slave, found_slave); |
1176 | alb_fasten_mac_swap(bond, slave, found_slave); | |
1da177e4 LT |
1177 | } |
1178 | } | |
1179 | } | |
1180 | ||
1181 | /** | |
1182 | * alb_handle_addr_collision_on_attach | |
1183 | * @bond: bonding we're working on | |
1184 | * @slave: the slave that was just attached | |
1185 | * | |
1186 | * checks uniqueness of slave's mac address and handles the case the | |
1187 | * new slave uses the bonds mac address. | |
1188 | * | |
1189 | * If the permanent hw address of @slave is @bond's hw address, we need to | |
1190 | * find a different hw address to give @slave, that isn't in use by any other | |
77c8e2c0 | 1191 | * slave in the bond. This address must be, of course, one of the permanent |
1da177e4 LT |
1192 | * addresses of the other slaves. |
1193 | * | |
1194 | * We go over the slave list, and for each slave there we compare its | |
1195 | * permanent hw address with the current address of all the other slaves. | |
1196 | * If no match was found, then we've found a slave with a permanent address | |
1197 | * that isn't used by any other slave in the bond, so we can assign it to | |
1198 | * @slave. | |
1199 | * | |
1200 | * assumption: this function is called before @slave is attached to the | |
cedb743f | 1201 | * bond slave list. |
1da177e4 LT |
1202 | */ |
1203 | static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slave *slave) | |
1204 | { | |
1da177e4 | 1205 | struct slave *has_bond_addr = bond->curr_active_slave; |
9caff1e7 VF |
1206 | struct slave *tmp_slave1, *free_mac_slave = NULL; |
1207 | struct list_head *iter; | |
1da177e4 | 1208 | |
0965a1f3 | 1209 | if (!bond_has_slaves(bond)) { |
1da177e4 LT |
1210 | /* this is the first slave */ |
1211 | return 0; | |
1212 | } | |
1213 | ||
1214 | /* if slave's mac address differs from bond's mac address | |
1215 | * check uniqueness of slave's mac address against the other | |
1216 | * slaves in the bond. | |
1217 | */ | |
a6700db1 | 1218 | if (!ether_addr_equal_64bits(slave->perm_hwaddr, bond->dev->dev_addr)) { |
cedb743f | 1219 | if (!bond_slave_has_mac(bond, slave->dev->dev_addr)) |
6b38aefe | 1220 | return 0; |
1da177e4 | 1221 | |
6b38aefe JL |
1222 | /* Try setting slave mac to bond address and fall-through |
1223 | to code handling that situation below... */ | |
b924551b | 1224 | alb_set_slave_mac_addr(slave, bond->dev->dev_addr); |
1da177e4 LT |
1225 | } |
1226 | ||
1227 | /* The slave's address is equal to the address of the bond. | |
1228 | * Search for a spare address in the bond for this slave. | |
1229 | */ | |
9caff1e7 | 1230 | bond_for_each_slave(bond, tmp_slave1, iter) { |
cedb743f | 1231 | if (!bond_slave_has_mac(bond, tmp_slave1->perm_hwaddr)) { |
1da177e4 LT |
1232 | /* no slave has tmp_slave1's perm addr |
1233 | * as its curr addr | |
1234 | */ | |
1235 | free_mac_slave = tmp_slave1; | |
1236 | break; | |
1237 | } | |
1238 | ||
1239 | if (!has_bond_addr) { | |
a6700db1 JP |
1240 | if (ether_addr_equal_64bits(tmp_slave1->dev->dev_addr, |
1241 | bond->dev->dev_addr)) { | |
1da177e4 LT |
1242 | |
1243 | has_bond_addr = tmp_slave1; | |
1244 | } | |
1245 | } | |
1246 | } | |
1247 | ||
1248 | if (free_mac_slave) { | |
b924551b | 1249 | alb_set_slave_mac_addr(slave, free_mac_slave->perm_hwaddr); |
1da177e4 | 1250 | |
a4aee5c8 | 1251 | 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 |
1252 | bond->dev->name, slave->dev->name, |
1253 | free_mac_slave->dev->name); | |
1da177e4 LT |
1254 | |
1255 | } else if (has_bond_addr) { | |
a4aee5c8 | 1256 | 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 | 1257 | bond->dev->name, slave->dev->name); |
1da177e4 LT |
1258 | return -EFAULT; |
1259 | } | |
1260 | ||
1261 | return 0; | |
1262 | } | |
1263 | ||
1264 | /** | |
1265 | * alb_set_mac_address | |
1266 | * @bond: | |
1267 | * @addr: | |
1268 | * | |
1269 | * In TLB mode all slaves are configured to the bond's hw address, but set | |
1270 | * their dev_addr field to different addresses (based on their permanent hw | |
1271 | * addresses). | |
1272 | * | |
1273 | * For each slave, this function sets the interface to the new address and then | |
1274 | * changes its dev_addr field to its previous value. | |
1275 | * | |
1276 | * Unwinding assumes bond's mac address has not yet changed. | |
1277 | */ | |
1278 | static int alb_set_mac_address(struct bonding *bond, void *addr) | |
1279 | { | |
81f23b13 | 1280 | struct slave *slave, *rollback_slave; |
9caff1e7 | 1281 | struct list_head *iter; |
dec1e90e | 1282 | struct sockaddr sa; |
81f23b13 | 1283 | char tmp_addr[ETH_ALEN]; |
1da177e4 | 1284 | int res; |
1da177e4 | 1285 | |
dec1e90e | 1286 | if (bond->alb_info.rlb_enabled) |
1da177e4 | 1287 | return 0; |
1da177e4 | 1288 | |
9caff1e7 | 1289 | bond_for_each_slave(bond, slave, iter) { |
1da177e4 LT |
1290 | /* save net_device's current hw address */ |
1291 | memcpy(tmp_addr, slave->dev->dev_addr, ETH_ALEN); | |
1292 | ||
1293 | res = dev_set_mac_address(slave->dev, addr); | |
1294 | ||
1295 | /* restore net_device's hw address */ | |
1296 | memcpy(slave->dev->dev_addr, tmp_addr, ETH_ALEN); | |
1297 | ||
eb7cc59a | 1298 | if (res) |
1da177e4 | 1299 | goto unwind; |
1da177e4 LT |
1300 | } |
1301 | ||
1302 | return 0; | |
1303 | ||
1304 | unwind: | |
1305 | memcpy(sa.sa_data, bond->dev->dev_addr, bond->dev->addr_len); | |
1306 | sa.sa_family = bond->dev->type; | |
1307 | ||
1308 | /* unwind from head to the slave that failed */ | |
9caff1e7 | 1309 | bond_for_each_slave(bond, rollback_slave, iter) { |
81f23b13 VF |
1310 | if (rollback_slave == slave) |
1311 | break; | |
1312 | memcpy(tmp_addr, rollback_slave->dev->dev_addr, ETH_ALEN); | |
1313 | dev_set_mac_address(rollback_slave->dev, &sa); | |
1314 | memcpy(rollback_slave->dev->dev_addr, tmp_addr, ETH_ALEN); | |
1da177e4 LT |
1315 | } |
1316 | ||
1317 | return res; | |
1318 | } | |
1319 | ||
1320 | /************************ exported alb funcions ************************/ | |
1321 | ||
1322 | int bond_alb_initialize(struct bonding *bond, int rlb_enabled) | |
1323 | { | |
1324 | int res; | |
1325 | ||
1326 | res = tlb_initialize(bond); | |
1327 | if (res) { | |
1328 | return res; | |
1329 | } | |
1330 | ||
1331 | if (rlb_enabled) { | |
1332 | bond->alb_info.rlb_enabled = 1; | |
1333 | /* initialize rlb */ | |
1334 | res = rlb_initialize(bond); | |
1335 | if (res) { | |
1336 | tlb_deinitialize(bond); | |
1337 | return res; | |
1338 | } | |
b76850ab MW |
1339 | } else { |
1340 | bond->alb_info.rlb_enabled = 0; | |
1da177e4 LT |
1341 | } |
1342 | ||
1343 | return 0; | |
1344 | } | |
1345 | ||
1346 | void bond_alb_deinitialize(struct bonding *bond) | |
1347 | { | |
1348 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1349 | ||
1350 | tlb_deinitialize(bond); | |
1351 | ||
1352 | if (bond_info->rlb_enabled) { | |
1353 | rlb_deinitialize(bond); | |
1354 | } | |
1355 | } | |
1356 | ||
1357 | int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev) | |
1358 | { | |
454d7c9b | 1359 | struct bonding *bond = netdev_priv(bond_dev); |
1da177e4 LT |
1360 | struct ethhdr *eth_data; |
1361 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1362 | struct slave *tx_slave = NULL; | |
d3bb52b0 | 1363 | static const __be32 ip_bcast = htonl(0xffffffff); |
1da177e4 LT |
1364 | int hash_size = 0; |
1365 | int do_tx_balance = 1; | |
1366 | u32 hash_index = 0; | |
eddc9ec5 | 1367 | const u8 *hash_start = NULL; |
2d1ea19d | 1368 | struct ipv6hdr *ip6hdr; |
1da177e4 | 1369 | |
459a98ed | 1370 | skb_reset_mac_header(skb); |
1da177e4 LT |
1371 | eth_data = eth_hdr(skb); |
1372 | ||
1da177e4 | 1373 | switch (ntohs(skb->protocol)) { |
eddc9ec5 ACM |
1374 | case ETH_P_IP: { |
1375 | const struct iphdr *iph = ip_hdr(skb); | |
1376 | ||
a6700db1 | 1377 | if (ether_addr_equal_64bits(eth_data->h_dest, mac_bcast) || |
eddc9ec5 ACM |
1378 | (iph->daddr == ip_bcast) || |
1379 | (iph->protocol == IPPROTO_IGMP)) { | |
1da177e4 LT |
1380 | do_tx_balance = 0; |
1381 | break; | |
1382 | } | |
eddc9ec5 ACM |
1383 | hash_start = (char *)&(iph->daddr); |
1384 | hash_size = sizeof(iph->daddr); | |
1385 | } | |
1da177e4 LT |
1386 | break; |
1387 | case ETH_P_IPV6: | |
2d1ea19d VY |
1388 | /* IPv6 doesn't really use broadcast mac address, but leave |
1389 | * that here just in case. | |
1390 | */ | |
a6700db1 | 1391 | if (ether_addr_equal_64bits(eth_data->h_dest, mac_bcast)) { |
1da177e4 LT |
1392 | do_tx_balance = 0; |
1393 | break; | |
2d1ea19d VY |
1394 | } |
1395 | ||
1396 | /* IPv6 uses all-nodes multicast as an equivalent to | |
1397 | * broadcasts in IPv4. | |
1398 | */ | |
a6700db1 | 1399 | if (ether_addr_equal_64bits(eth_data->h_dest, mac_v6_allmcast)) { |
2d1ea19d VY |
1400 | do_tx_balance = 0; |
1401 | break; | |
1402 | } | |
1403 | ||
1404 | /* Additianally, DAD probes should not be tx-balanced as that | |
1405 | * will lead to false positives for duplicate addresses and | |
1406 | * prevent address configuration from working. | |
1407 | */ | |
1408 | ip6hdr = ipv6_hdr(skb); | |
1409 | if (ipv6_addr_any(&ip6hdr->saddr)) { | |
1410 | do_tx_balance = 0; | |
1411 | break; | |
1da177e4 LT |
1412 | } |
1413 | ||
0660e03f ACM |
1414 | hash_start = (char *)&(ipv6_hdr(skb)->daddr); |
1415 | hash_size = sizeof(ipv6_hdr(skb)->daddr); | |
1da177e4 LT |
1416 | break; |
1417 | case ETH_P_IPX: | |
d3bb52b0 | 1418 | if (ipx_hdr(skb)->ipx_checksum != IPX_NO_CHECKSUM) { |
1da177e4 LT |
1419 | /* something is wrong with this packet */ |
1420 | do_tx_balance = 0; | |
1421 | break; | |
1422 | } | |
1423 | ||
1424 | if (ipx_hdr(skb)->ipx_type != IPX_TYPE_NCP) { | |
1425 | /* The only protocol worth balancing in | |
1426 | * this family since it has an "ARP" like | |
1427 | * mechanism | |
1428 | */ | |
1429 | do_tx_balance = 0; | |
1430 | break; | |
1431 | } | |
1432 | ||
b85b6fb1 | 1433 | hash_start = (char *)eth_data->h_dest; |
1da177e4 LT |
1434 | hash_size = ETH_ALEN; |
1435 | break; | |
1436 | case ETH_P_ARP: | |
1437 | do_tx_balance = 0; | |
1438 | if (bond_info->rlb_enabled) { | |
1439 | tx_slave = rlb_arp_xmit(skb, bond); | |
1440 | } | |
1441 | break; | |
1442 | default: | |
1443 | do_tx_balance = 0; | |
1444 | break; | |
1445 | } | |
1446 | ||
1447 | if (do_tx_balance) { | |
1448 | hash_index = _simple_hash(hash_start, hash_size); | |
1449 | tx_slave = tlb_choose_channel(bond, hash_index, skb->len); | |
1450 | } | |
1451 | ||
1452 | if (!tx_slave) { | |
1453 | /* unbalanced or unassigned, send through primary */ | |
28c71926 | 1454 | tx_slave = rcu_dereference(bond->curr_active_slave); |
1da177e4 LT |
1455 | bond_info->unbalanced_load += skb->len; |
1456 | } | |
1457 | ||
1458 | if (tx_slave && SLAVE_IS_OK(tx_slave)) { | |
28c71926 | 1459 | if (tx_slave != rcu_dereference(bond->curr_active_slave)) { |
1da177e4 LT |
1460 | memcpy(eth_data->h_source, |
1461 | tx_slave->dev->dev_addr, | |
1462 | ETH_ALEN); | |
1463 | } | |
1464 | ||
4d4ac1b0 | 1465 | bond_dev_queue_xmit(bond, skb, tx_slave->dev); |
1466 | goto out; | |
1da177e4 LT |
1467 | } else { |
1468 | if (tx_slave) { | |
f515e6b7 MU |
1469 | _lock_tx_hashtbl(bond); |
1470 | __tlb_clear_slave(bond, tx_slave, 0); | |
1471 | _unlock_tx_hashtbl(bond); | |
1da177e4 LT |
1472 | } |
1473 | } | |
1474 | ||
4d4ac1b0 | 1475 | /* no suitable interface, frame not sent */ |
1476 | kfree_skb(skb); | |
1477 | out: | |
ec634fe3 | 1478 | return NETDEV_TX_OK; |
1da177e4 LT |
1479 | } |
1480 | ||
1b76b316 | 1481 | void bond_alb_monitor(struct work_struct *work) |
1da177e4 | 1482 | { |
1b76b316 JV |
1483 | struct bonding *bond = container_of(work, struct bonding, |
1484 | alb_work.work); | |
1da177e4 | 1485 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
9caff1e7 | 1486 | struct list_head *iter; |
1da177e4 | 1487 | struct slave *slave; |
1da177e4 | 1488 | |
0965a1f3 | 1489 | if (!bond_has_slaves(bond)) { |
1da177e4 LT |
1490 | bond_info->tx_rebalance_counter = 0; |
1491 | bond_info->lp_counter = 0; | |
1492 | goto re_arm; | |
1493 | } | |
1494 | ||
733ab639 | 1495 | rcu_read_lock(); |
1496 | ||
1da177e4 LT |
1497 | bond_info->tx_rebalance_counter++; |
1498 | bond_info->lp_counter++; | |
1499 | ||
1500 | /* send learning packets */ | |
7eacd038 | 1501 | if (bond_info->lp_counter >= BOND_ALB_LP_TICKS(bond)) { |
1da177e4 LT |
1502 | /* change of curr_active_slave involves swapping of mac addresses. |
1503 | * in order to avoid this swapping from happening while | |
1504 | * sending the learning packets, the curr_slave_lock must be held for | |
1505 | * read. | |
1506 | */ | |
1507 | read_lock(&bond->curr_slave_lock); | |
1508 | ||
733ab639 | 1509 | bond_for_each_slave_rcu(bond, slave, iter) |
e944ef79 | 1510 | alb_send_learning_packets(slave, slave->dev->dev_addr); |
1da177e4 LT |
1511 | |
1512 | read_unlock(&bond->curr_slave_lock); | |
1513 | ||
1514 | bond_info->lp_counter = 0; | |
1515 | } | |
1516 | ||
1517 | /* rebalance tx traffic */ | |
1518 | if (bond_info->tx_rebalance_counter >= BOND_TLB_REBALANCE_TICKS) { | |
1519 | ||
1520 | read_lock(&bond->curr_slave_lock); | |
1521 | ||
733ab639 | 1522 | bond_for_each_slave_rcu(bond, slave, iter) { |
1da177e4 LT |
1523 | tlb_clear_slave(bond, slave, 1); |
1524 | if (slave == bond->curr_active_slave) { | |
1525 | SLAVE_TLB_INFO(slave).load = | |
1526 | bond_info->unbalanced_load / | |
1527 | BOND_TLB_REBALANCE_INTERVAL; | |
1528 | bond_info->unbalanced_load = 0; | |
1529 | } | |
1530 | } | |
1531 | ||
1532 | read_unlock(&bond->curr_slave_lock); | |
1533 | ||
1534 | bond_info->tx_rebalance_counter = 0; | |
1535 | } | |
1536 | ||
1537 | /* handle rlb stuff */ | |
1538 | if (bond_info->rlb_enabled) { | |
1da177e4 LT |
1539 | if (bond_info->primary_is_promisc && |
1540 | (++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) { | |
1541 | ||
1f2cd845 DM |
1542 | /* |
1543 | * dev_set_promiscuity requires rtnl and | |
1544 | * nothing else. Avoid race with bond_close. | |
1545 | */ | |
733ab639 | 1546 | rcu_read_unlock(); |
1547 | if (!rtnl_trylock()) | |
1f2cd845 | 1548 | goto re_arm; |
1f2cd845 | 1549 | |
1da177e4 LT |
1550 | bond_info->rlb_promisc_timeout_counter = 0; |
1551 | ||
1552 | /* If the primary was set to promiscuous mode | |
1553 | * because a slave was disabled then | |
1554 | * it can now leave promiscuous mode. | |
1555 | */ | |
1556 | dev_set_promiscuity(bond->curr_active_slave->dev, -1); | |
1557 | bond_info->primary_is_promisc = 0; | |
1f2cd845 DM |
1558 | |
1559 | rtnl_unlock(); | |
733ab639 | 1560 | rcu_read_lock(); |
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 | } | |
733ab639 | 1582 | rcu_read_unlock(); |
1da177e4 | 1583 | re_arm: |
e6d265e8 | 1584 | queue_delayed_work(bond->wq, &bond->alb_work, alb_delta_in_ticks); |
1da177e4 LT |
1585 | } |
1586 | ||
1587 | /* assumption: called before the slave is attached to the bond | |
1588 | * and not locked by the bond lock | |
1589 | */ | |
1590 | int bond_alb_init_slave(struct bonding *bond, struct slave *slave) | |
1591 | { | |
1592 | int res; | |
1593 | ||
b924551b | 1594 | res = alb_set_slave_mac_addr(slave, slave->perm_hwaddr); |
1da177e4 LT |
1595 | if (res) { |
1596 | return res; | |
1597 | } | |
1598 | ||
1da177e4 | 1599 | res = alb_handle_addr_collision_on_attach(bond, slave); |
1da177e4 LT |
1600 | if (res) { |
1601 | return res; | |
1602 | } | |
1603 | ||
1604 | tlb_init_slave(slave); | |
1605 | ||
1606 | /* order a rebalance ASAP */ | |
1607 | bond->alb_info.tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS; | |
1608 | ||
1609 | if (bond->alb_info.rlb_enabled) { | |
1610 | bond->alb_info.rlb_rebalance = 1; | |
1611 | } | |
1612 | ||
1613 | return 0; | |
1614 | } | |
1615 | ||
2543331d JV |
1616 | /* |
1617 | * Remove slave from tlb and rlb hash tables, and fix up MAC addresses | |
1618 | * if necessary. | |
1619 | * | |
1620 | * Caller must hold RTNL and no other locks | |
1621 | */ | |
1da177e4 LT |
1622 | void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave) |
1623 | { | |
0965a1f3 | 1624 | if (bond_has_slaves(bond)) |
1da177e4 | 1625 | alb_change_hw_addr_on_detach(bond, slave); |
1da177e4 LT |
1626 | |
1627 | tlb_clear_slave(bond, slave, 0); | |
1628 | ||
1629 | if (bond->alb_info.rlb_enabled) { | |
6475ae4c | 1630 | bond->alb_info.rx_slave = NULL; |
1da177e4 LT |
1631 | rlb_clear_slave(bond, slave); |
1632 | } | |
1633 | } | |
1634 | ||
1635 | /* Caller must hold bond lock for read */ | |
1636 | void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link) | |
1637 | { | |
1638 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1639 | ||
1640 | if (link == BOND_LINK_DOWN) { | |
1641 | tlb_clear_slave(bond, slave, 0); | |
1642 | if (bond->alb_info.rlb_enabled) { | |
1643 | rlb_clear_slave(bond, slave); | |
1644 | } | |
1645 | } else if (link == BOND_LINK_UP) { | |
1646 | /* order a rebalance ASAP */ | |
1647 | bond_info->tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS; | |
1648 | if (bond->alb_info.rlb_enabled) { | |
1649 | bond->alb_info.rlb_rebalance = 1; | |
1650 | /* If the updelay module parameter is smaller than the | |
1651 | * forwarding delay of the switch the rebalance will | |
1652 | * not work because the rebalance arp replies will | |
1653 | * not be forwarded to the clients.. | |
1654 | */ | |
1655 | } | |
1656 | } | |
1657 | } | |
1658 | ||
1659 | /** | |
1660 | * bond_alb_handle_active_change - assign new curr_active_slave | |
1661 | * @bond: our bonding struct | |
1662 | * @new_slave: new slave to assign | |
1663 | * | |
1664 | * Set the bond->curr_active_slave to @new_slave and handle | |
1665 | * mac address swapping and promiscuity changes as needed. | |
1666 | * | |
059fe7a5 JV |
1667 | * If new_slave is NULL, caller must hold curr_slave_lock or |
1668 | * bond->lock for write. | |
1669 | * | |
b2e7aceb | 1670 | * If new_slave is not NULL, caller must hold RTNL, curr_slave_lock |
1671 | * for write. Processing here may sleep, so no other locks may be held. | |
1da177e4 LT |
1672 | */ |
1673 | void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave) | |
1f78d9f9 | 1674 | __releases(&bond->curr_slave_lock) |
1f78d9f9 | 1675 | __acquires(&bond->curr_slave_lock) |
1da177e4 LT |
1676 | { |
1677 | struct slave *swap_slave; | |
1da177e4 | 1678 | |
dec1e90e | 1679 | if (bond->curr_active_slave == new_slave) |
1da177e4 | 1680 | return; |
1da177e4 LT |
1681 | |
1682 | if (bond->curr_active_slave && bond->alb_info.primary_is_promisc) { | |
1683 | dev_set_promiscuity(bond->curr_active_slave->dev, -1); | |
1684 | bond->alb_info.primary_is_promisc = 0; | |
1685 | bond->alb_info.rlb_promisc_timeout_counter = 0; | |
1686 | } | |
1687 | ||
1688 | swap_slave = bond->curr_active_slave; | |
278b2083 | 1689 | rcu_assign_pointer(bond->curr_active_slave, new_slave); |
1da177e4 | 1690 | |
0965a1f3 | 1691 | if (!new_slave || !bond_has_slaves(bond)) |
1da177e4 | 1692 | return; |
1da177e4 LT |
1693 | |
1694 | /* set the new curr_active_slave to the bonds mac address | |
1695 | * i.e. swap mac addresses of old curr_active_slave and new curr_active_slave | |
1696 | */ | |
b88ec38d VF |
1697 | if (!swap_slave) |
1698 | swap_slave = bond_slave_has_mac(bond, bond->dev->dev_addr); | |
1da177e4 | 1699 | |
059fe7a5 JV |
1700 | /* |
1701 | * Arrange for swap_slave and new_slave to temporarily be | |
1702 | * ignored so we can mess with their MAC addresses without | |
1703 | * fear of interference from transmit activity. | |
1704 | */ | |
dec1e90e | 1705 | if (swap_slave) |
059fe7a5 | 1706 | tlb_clear_slave(bond, swap_slave, 1); |
059fe7a5 JV |
1707 | tlb_clear_slave(bond, new_slave, 1); |
1708 | ||
1709 | write_unlock_bh(&bond->curr_slave_lock); | |
059fe7a5 | 1710 | |
e0138a66 JV |
1711 | ASSERT_RTNL(); |
1712 | ||
4996b909 VF |
1713 | /* in TLB mode, the slave might flip down/up with the old dev_addr, |
1714 | * and thus filter bond->dev_addr's packets, so force bond's mac | |
1715 | */ | |
1716 | if (bond->params.mode == BOND_MODE_TLB) { | |
1717 | struct sockaddr sa; | |
1718 | u8 tmp_addr[ETH_ALEN]; | |
1719 | ||
1720 | memcpy(tmp_addr, new_slave->dev->dev_addr, ETH_ALEN); | |
1721 | ||
1722 | memcpy(sa.sa_data, bond->dev->dev_addr, bond->dev->addr_len); | |
1723 | sa.sa_family = bond->dev->type; | |
1724 | /* we don't care if it can't change its mac, best effort */ | |
1725 | dev_set_mac_address(new_slave->dev, &sa); | |
1726 | ||
1727 | memcpy(new_slave->dev->dev_addr, tmp_addr, ETH_ALEN); | |
1728 | } | |
1729 | ||
1da177e4 LT |
1730 | /* curr_active_slave must be set before calling alb_swap_mac_addr */ |
1731 | if (swap_slave) { | |
1732 | /* swap mac address */ | |
43547ea6 | 1733 | alb_swap_mac_addr(swap_slave, new_slave); |
059fe7a5 JV |
1734 | alb_fasten_mac_swap(bond, swap_slave, new_slave); |
1735 | } else { | |
b88ec38d VF |
1736 | /* set the new_slave to the bond mac address */ |
1737 | alb_set_slave_mac_addr(new_slave, bond->dev->dev_addr); | |
1da177e4 LT |
1738 | alb_send_learning_packets(new_slave, bond->dev->dev_addr); |
1739 | } | |
059fe7a5 JV |
1740 | |
1741 | write_lock_bh(&bond->curr_slave_lock); | |
1da177e4 LT |
1742 | } |
1743 | ||
059fe7a5 JV |
1744 | /* |
1745 | * Called with RTNL | |
1746 | */ | |
1da177e4 | 1747 | int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr) |
1f78d9f9 | 1748 | __acquires(&bond->lock) |
815bcc27 | 1749 | __releases(&bond->lock) |
1da177e4 | 1750 | { |
454d7c9b | 1751 | struct bonding *bond = netdev_priv(bond_dev); |
1da177e4 | 1752 | struct sockaddr *sa = addr; |
b88ec38d | 1753 | struct slave *swap_slave; |
1da177e4 | 1754 | int res; |
1da177e4 LT |
1755 | |
1756 | if (!is_valid_ether_addr(sa->sa_data)) { | |
1757 | return -EADDRNOTAVAIL; | |
1758 | } | |
1759 | ||
1760 | res = alb_set_mac_address(bond, addr); | |
1761 | if (res) { | |
1762 | return res; | |
1763 | } | |
1764 | ||
1765 | memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len); | |
1766 | ||
1767 | /* If there is no curr_active_slave there is nothing else to do. | |
1768 | * Otherwise we'll need to pass the new address to it and handle | |
1769 | * duplications. | |
1770 | */ | |
1771 | if (!bond->curr_active_slave) { | |
1772 | return 0; | |
1773 | } | |
1774 | ||
b88ec38d | 1775 | swap_slave = bond_slave_has_mac(bond, bond_dev->dev_addr); |
1da177e4 LT |
1776 | |
1777 | if (swap_slave) { | |
43547ea6 | 1778 | alb_swap_mac_addr(swap_slave, bond->curr_active_slave); |
059fe7a5 | 1779 | alb_fasten_mac_swap(bond, swap_slave, bond->curr_active_slave); |
1da177e4 | 1780 | } else { |
b924551b | 1781 | alb_set_slave_mac_addr(bond->curr_active_slave, bond_dev->dev_addr); |
1da177e4 | 1782 | |
815bcc27 | 1783 | read_lock(&bond->lock); |
1da177e4 LT |
1784 | alb_send_learning_packets(bond->curr_active_slave, bond_dev->dev_addr); |
1785 | if (bond->alb_info.rlb_enabled) { | |
1786 | /* inform clients mac address has changed */ | |
1787 | rlb_req_update_slave_clients(bond, bond->curr_active_slave); | |
1788 | } | |
815bcc27 | 1789 | read_unlock(&bond->lock); |
1da177e4 LT |
1790 | } |
1791 | ||
1792 | return 0; | |
1793 | } | |
1794 | ||
1795 | void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id) | |
1796 | { | |
1da177e4 LT |
1797 | if (bond->alb_info.rlb_enabled) { |
1798 | rlb_clear_vlan(bond, vlan_id); | |
1799 | } | |
1800 | } | |
1801 |