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 | ||
1da177e4 LT |
22 | #include <linux/skbuff.h> |
23 | #include <linux/netdevice.h> | |
24 | #include <linux/etherdevice.h> | |
25 | #include <linux/pkt_sched.h> | |
26 | #include <linux/spinlock.h> | |
27 | #include <linux/slab.h> | |
28 | #include <linux/timer.h> | |
29 | #include <linux/ip.h> | |
30 | #include <linux/ipv6.h> | |
31 | #include <linux/if_arp.h> | |
32 | #include <linux/if_ether.h> | |
33 | #include <linux/if_bonding.h> | |
34 | #include <linux/if_vlan.h> | |
35 | #include <linux/in.h> | |
36 | #include <net/ipx.h> | |
37 | #include <net/arp.h> | |
2d1ea19d | 38 | #include <net/ipv6.h> |
1da177e4 | 39 | #include <asm/byteorder.h> |
1ef8019b DM |
40 | #include <net/bonding.h> |
41 | #include <net/bond_alb.h> | |
1da177e4 LT |
42 | |
43 | ||
1da177e4 | 44 | |
885a136c ED |
45 | #ifndef __long_aligned |
46 | #define __long_aligned __attribute__((aligned((sizeof(long))))) | |
47 | #endif | |
48 | static const u8 mac_bcast[ETH_ALEN] __long_aligned = { | |
49 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff | |
50 | }; | |
51 | static const u8 mac_v6_allmcast[ETH_ALEN] __long_aligned = { | |
52 | 0x33, 0x33, 0x00, 0x00, 0x00, 0x01 | |
53 | }; | |
1da177e4 LT |
54 | static const int alb_delta_in_ticks = HZ / ALB_TIMER_TICKS_PER_SEC; |
55 | ||
56 | #pragma pack(1) | |
57 | struct learning_pkt { | |
58 | u8 mac_dst[ETH_ALEN]; | |
59 | u8 mac_src[ETH_ALEN]; | |
d3bb52b0 | 60 | __be16 type; |
1da177e4 LT |
61 | u8 padding[ETH_ZLEN - ETH_HLEN]; |
62 | }; | |
63 | ||
64 | struct arp_pkt { | |
d3bb52b0 AV |
65 | __be16 hw_addr_space; |
66 | __be16 prot_addr_space; | |
1da177e4 LT |
67 | u8 hw_addr_len; |
68 | u8 prot_addr_len; | |
d3bb52b0 | 69 | __be16 op_code; |
1da177e4 | 70 | u8 mac_src[ETH_ALEN]; /* sender hardware address */ |
d3bb52b0 | 71 | __be32 ip_src; /* sender IP address */ |
1da177e4 | 72 | u8 mac_dst[ETH_ALEN]; /* target hardware address */ |
d3bb52b0 | 73 | __be32 ip_dst; /* target IP address */ |
1da177e4 LT |
74 | }; |
75 | #pragma pack() | |
76 | ||
a16aeb36 ACM |
77 | static inline struct arp_pkt *arp_pkt(const struct sk_buff *skb) |
78 | { | |
d56f90a7 | 79 | return (struct arp_pkt *)skb_network_header(skb); |
a16aeb36 ACM |
80 | } |
81 | ||
1da177e4 | 82 | /* Forward declaration */ |
d0c21d43 VY |
83 | static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[], |
84 | bool strict_match); | |
e53665c6 JB |
85 | static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp); |
86 | static void rlb_src_unlink(struct bonding *bond, u32 index); | |
87 | static void rlb_src_link(struct bonding *bond, u32 ip_src_hash, | |
88 | u32 ip_dst_hash); | |
1da177e4 | 89 | |
eddc9ec5 | 90 | static inline u8 _simple_hash(const u8 *hash_start, int hash_size) |
1da177e4 LT |
91 | { |
92 | int i; | |
93 | u8 hash = 0; | |
94 | ||
fdb89d75 | 95 | for (i = 0; i < hash_size; i++) |
1da177e4 | 96 | hash ^= hash_start[i]; |
1da177e4 LT |
97 | |
98 | return hash; | |
99 | } | |
100 | ||
101 | /*********************** tlb specific functions ***************************/ | |
102 | ||
1da177e4 LT |
103 | static inline void tlb_init_table_entry(struct tlb_client_info *entry, int save_load) |
104 | { | |
105 | if (save_load) { | |
106 | entry->load_history = 1 + entry->tx_bytes / | |
107 | BOND_TLB_REBALANCE_INTERVAL; | |
108 | entry->tx_bytes = 0; | |
109 | } | |
110 | ||
111 | entry->tx_slave = NULL; | |
112 | entry->next = TLB_NULL_INDEX; | |
113 | entry->prev = TLB_NULL_INDEX; | |
114 | } | |
115 | ||
116 | static inline void tlb_init_slave(struct slave *slave) | |
117 | { | |
118 | SLAVE_TLB_INFO(slave).load = 0; | |
119 | SLAVE_TLB_INFO(slave).head = TLB_NULL_INDEX; | |
120 | } | |
121 | ||
f515e6b7 MU |
122 | static void __tlb_clear_slave(struct bonding *bond, struct slave *slave, |
123 | int save_load) | |
1da177e4 LT |
124 | { |
125 | struct tlb_client_info *tx_hash_table; | |
126 | u32 index; | |
127 | ||
1da177e4 LT |
128 | /* clear slave from tx_hashtbl */ |
129 | tx_hash_table = BOND_ALB_INFO(bond).tx_hashtbl; | |
130 | ||
ce39a800 AG |
131 | /* skip this if we've already freed the tx hash table */ |
132 | if (tx_hash_table) { | |
133 | index = SLAVE_TLB_INFO(slave).head; | |
134 | while (index != TLB_NULL_INDEX) { | |
135 | u32 next_index = tx_hash_table[index].next; | |
136 | tlb_init_table_entry(&tx_hash_table[index], save_load); | |
137 | index = next_index; | |
138 | } | |
1da177e4 LT |
139 | } |
140 | ||
1da177e4 | 141 | tlb_init_slave(slave); |
f515e6b7 | 142 | } |
5af47b2f | 143 | |
f515e6b7 MU |
144 | static void tlb_clear_slave(struct bonding *bond, struct slave *slave, |
145 | int save_load) | |
146 | { | |
4bab16d7 | 147 | spin_lock_bh(&bond->mode_lock); |
f515e6b7 | 148 | __tlb_clear_slave(bond, slave, save_load); |
4bab16d7 | 149 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 LT |
150 | } |
151 | ||
152 | /* Must be called before starting the monitor timer */ | |
153 | static int tlb_initialize(struct bonding *bond) | |
154 | { | |
155 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
156 | int size = TLB_HASH_TABLE_SIZE * sizeof(struct tlb_client_info); | |
0d206a3a | 157 | struct tlb_client_info *new_hashtbl; |
1da177e4 LT |
158 | int i; |
159 | ||
243cb4e5 | 160 | new_hashtbl = kzalloc(size, GFP_KERNEL); |
e404decb | 161 | if (!new_hashtbl) |
1da177e4 | 162 | return -1; |
e404decb | 163 | |
4bab16d7 | 164 | spin_lock_bh(&bond->mode_lock); |
0d206a3a MW |
165 | |
166 | bond_info->tx_hashtbl = new_hashtbl; | |
1da177e4 | 167 | |
fdb89d75 | 168 | for (i = 0; i < TLB_HASH_TABLE_SIZE; i++) |
38dbaf0a | 169 | tlb_init_table_entry(&bond_info->tx_hashtbl[i], 0); |
1da177e4 | 170 | |
4bab16d7 | 171 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 LT |
172 | |
173 | return 0; | |
174 | } | |
175 | ||
176 | /* Must be called only after all slaves have been released */ | |
177 | static void tlb_deinitialize(struct bonding *bond) | |
178 | { | |
179 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
180 | ||
4bab16d7 | 181 | spin_lock_bh(&bond->mode_lock); |
1da177e4 LT |
182 | |
183 | kfree(bond_info->tx_hashtbl); | |
184 | bond_info->tx_hashtbl = NULL; | |
185 | ||
4bab16d7 | 186 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 LT |
187 | } |
188 | ||
097811bb JP |
189 | static long long compute_gap(struct slave *slave) |
190 | { | |
191 | return (s64) (slave->speed << 20) - /* Convert to Megabit per sec */ | |
192 | (s64) (SLAVE_TLB_INFO(slave).load << 3); /* Bytes to bits */ | |
193 | } | |
194 | ||
1da177e4 LT |
195 | static struct slave *tlb_get_least_loaded_slave(struct bonding *bond) |
196 | { | |
197 | struct slave *slave, *least_loaded; | |
9caff1e7 | 198 | struct list_head *iter; |
097811bb | 199 | long long max_gap; |
1da177e4 | 200 | |
097811bb JP |
201 | least_loaded = NULL; |
202 | max_gap = LLONG_MIN; | |
1da177e4 LT |
203 | |
204 | /* Find the slave with the largest gap */ | |
28c71926 | 205 | bond_for_each_slave_rcu(bond, slave, iter) { |
8557cd74 | 206 | if (bond_slave_can_tx(slave)) { |
097811bb JP |
207 | long long gap = compute_gap(slave); |
208 | ||
1da177e4 LT |
209 | if (max_gap < gap) { |
210 | least_loaded = slave; | |
211 | max_gap = gap; | |
212 | } | |
213 | } | |
214 | } | |
215 | ||
216 | return least_loaded; | |
217 | } | |
218 | ||
f515e6b7 MU |
219 | static struct slave *__tlb_choose_channel(struct bonding *bond, u32 hash_index, |
220 | u32 skb_len) | |
1da177e4 LT |
221 | { |
222 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
223 | struct tlb_client_info *hash_table; | |
224 | struct slave *assigned_slave; | |
225 | ||
1da177e4 LT |
226 | hash_table = bond_info->tx_hashtbl; |
227 | assigned_slave = hash_table[hash_index].tx_slave; | |
228 | if (!assigned_slave) { | |
229 | assigned_slave = tlb_get_least_loaded_slave(bond); | |
230 | ||
231 | if (assigned_slave) { | |
232 | struct tlb_slave_info *slave_info = | |
233 | &(SLAVE_TLB_INFO(assigned_slave)); | |
234 | u32 next_index = slave_info->head; | |
235 | ||
236 | hash_table[hash_index].tx_slave = assigned_slave; | |
237 | hash_table[hash_index].next = next_index; | |
238 | hash_table[hash_index].prev = TLB_NULL_INDEX; | |
239 | ||
fdb89d75 | 240 | if (next_index != TLB_NULL_INDEX) |
1da177e4 | 241 | hash_table[next_index].prev = hash_index; |
1da177e4 LT |
242 | |
243 | slave_info->head = hash_index; | |
244 | slave_info->load += | |
245 | hash_table[hash_index].load_history; | |
246 | } | |
247 | } | |
248 | ||
fdb89d75 | 249 | if (assigned_slave) |
1da177e4 | 250 | hash_table[hash_index].tx_bytes += skb_len; |
1da177e4 | 251 | |
1da177e4 LT |
252 | return assigned_slave; |
253 | } | |
254 | ||
f515e6b7 MU |
255 | static struct slave *tlb_choose_channel(struct bonding *bond, u32 hash_index, |
256 | u32 skb_len) | |
257 | { | |
258 | struct slave *tx_slave; | |
547942ca NA |
259 | |
260 | /* We don't need to disable softirq here, becase | |
f515e6b7 MU |
261 | * tlb_choose_channel() is only called by bond_alb_xmit() |
262 | * which already has softirq disabled. | |
263 | */ | |
4bab16d7 | 264 | spin_lock(&bond->mode_lock); |
f515e6b7 | 265 | tx_slave = __tlb_choose_channel(bond, hash_index, skb_len); |
4bab16d7 | 266 | spin_unlock(&bond->mode_lock); |
547942ca | 267 | |
f515e6b7 MU |
268 | return tx_slave; |
269 | } | |
270 | ||
1da177e4 | 271 | /*********************** rlb specific functions ***************************/ |
f515e6b7 | 272 | |
1da177e4 LT |
273 | /* when an ARP REPLY is received from a client update its info |
274 | * in the rx_hashtbl | |
275 | */ | |
276 | static void rlb_update_entry_from_arp(struct bonding *bond, struct arp_pkt *arp) | |
277 | { | |
278 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
279 | struct rlb_client_info *client_info; | |
280 | u32 hash_index; | |
281 | ||
4bab16d7 | 282 | spin_lock_bh(&bond->mode_lock); |
1da177e4 | 283 | |
b85b6fb1 | 284 | hash_index = _simple_hash((u8 *)&(arp->ip_src), sizeof(arp->ip_src)); |
1da177e4 LT |
285 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
286 | ||
287 | if ((client_info->assigned) && | |
288 | (client_info->ip_src == arp->ip_dst) && | |
42d782ac | 289 | (client_info->ip_dst == arp->ip_src) && |
a6700db1 | 290 | (!ether_addr_equal_64bits(client_info->mac_dst, arp->mac_src))) { |
1da177e4 | 291 | /* update the clients MAC address */ |
ada0f863 | 292 | ether_addr_copy(client_info->mac_dst, arp->mac_src); |
1da177e4 LT |
293 | client_info->ntt = 1; |
294 | bond_info->rx_ntt = 1; | |
295 | } | |
296 | ||
4bab16d7 | 297 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 LT |
298 | } |
299 | ||
de063b70 ED |
300 | static int rlb_arp_recv(const struct sk_buff *skb, struct bonding *bond, |
301 | struct slave *slave) | |
1da177e4 | 302 | { |
de063b70 | 303 | struct arp_pkt *arp, _arp; |
1da177e4 | 304 | |
3aba891d | 305 | if (skb->protocol != cpu_to_be16(ETH_P_ARP)) |
b99215cd | 306 | goto out; |
1da177e4 | 307 | |
de063b70 ED |
308 | arp = skb_header_pointer(skb, 0, sizeof(_arp), &_arp); |
309 | if (!arp) | |
b99215cd | 310 | goto out; |
1da177e4 | 311 | |
e53665c6 JB |
312 | /* We received an ARP from arp->ip_src. |
313 | * We might have used this IP address previously (on the bonding host | |
314 | * itself or on a system that is bridged together with the bond). | |
315 | * However, if arp->mac_src is different than what is stored in | |
316 | * rx_hashtbl, some other host is now using the IP and we must prevent | |
317 | * sending out client updates with this IP address and the old MAC | |
318 | * address. | |
319 | * Clean up all hash table entries that have this address as ip_src but | |
320 | * have a different mac_src. | |
321 | */ | |
322 | rlb_purge_src_ip(bond, arp); | |
323 | ||
1da177e4 LT |
324 | if (arp->op_code == htons(ARPOP_REPLY)) { |
325 | /* update rx hash table for this ARP */ | |
326 | rlb_update_entry_from_arp(bond, arp); | |
0a111a03 | 327 | netdev_dbg(bond->dev, "Server received an ARP Reply from client\n"); |
1da177e4 | 328 | } |
b99215cd DM |
329 | out: |
330 | return RX_HANDLER_ANOTHER; | |
1da177e4 LT |
331 | } |
332 | ||
56924c38 NA |
333 | /* Caller must hold rcu_read_lock() */ |
334 | static struct slave *__rlb_next_rx_slave(struct bonding *bond) | |
1da177e4 LT |
335 | { |
336 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
6475ae4c VF |
337 | struct slave *before = NULL, *rx_slave = NULL, *slave; |
338 | struct list_head *iter; | |
339 | bool found = false; | |
1da177e4 | 340 | |
56924c38 | 341 | bond_for_each_slave_rcu(bond, slave, iter) { |
8557cd74 | 342 | if (!bond_slave_can_tx(slave)) |
6475ae4c VF |
343 | continue; |
344 | if (!found) { | |
345 | if (!before || before->speed < slave->speed) | |
346 | before = slave; | |
347 | } else { | |
348 | if (!rx_slave || rx_slave->speed < slave->speed) | |
1da177e4 | 349 | rx_slave = slave; |
1da177e4 | 350 | } |
6475ae4c VF |
351 | if (slave == bond_info->rx_slave) |
352 | found = true; | |
1da177e4 | 353 | } |
6475ae4c VF |
354 | /* we didn't find anything after the current or we have something |
355 | * better before and up to the current slave | |
356 | */ | |
357 | if (!rx_slave || (before && rx_slave->speed < before->speed)) | |
358 | rx_slave = before; | |
1da177e4 | 359 | |
6475ae4c VF |
360 | if (rx_slave) |
361 | bond_info->rx_slave = rx_slave; | |
1da177e4 LT |
362 | |
363 | return rx_slave; | |
364 | } | |
365 | ||
56924c38 NA |
366 | /* Caller must hold RTNL, rcu_read_lock is obtained only to silence checkers */ |
367 | static struct slave *rlb_next_rx_slave(struct bonding *bond) | |
28c71926 | 368 | { |
56924c38 | 369 | struct slave *rx_slave; |
28c71926 | 370 | |
56924c38 | 371 | ASSERT_RTNL(); |
28c71926 | 372 | |
56924c38 NA |
373 | rcu_read_lock(); |
374 | rx_slave = __rlb_next_rx_slave(bond); | |
375 | rcu_read_unlock(); | |
28c71926 | 376 | |
377 | return rx_slave; | |
378 | } | |
379 | ||
1da177e4 LT |
380 | /* teach the switch the mac of a disabled slave |
381 | * on the primary for fault tolerance | |
382 | * | |
62c5f518 | 383 | * Caller must hold RTNL |
1da177e4 LT |
384 | */ |
385 | static void rlb_teach_disabled_mac_on_primary(struct bonding *bond, u8 addr[]) | |
386 | { | |
1c72cfdc | 387 | struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); |
4740d638 ED |
388 | |
389 | if (!curr_active) | |
1da177e4 | 390 | return; |
1da177e4 LT |
391 | |
392 | if (!bond->alb_info.primary_is_promisc) { | |
4740d638 | 393 | if (!dev_set_promiscuity(curr_active->dev, 1)) |
7e1a1ac1 WC |
394 | bond->alb_info.primary_is_promisc = 1; |
395 | else | |
396 | bond->alb_info.primary_is_promisc = 0; | |
1da177e4 LT |
397 | } |
398 | ||
399 | bond->alb_info.rlb_promisc_timeout_counter = 0; | |
400 | ||
4740d638 | 401 | alb_send_learning_packets(curr_active, addr, true); |
1da177e4 LT |
402 | } |
403 | ||
404 | /* slave being removed should not be active at this point | |
405 | * | |
b2e7aceb | 406 | * Caller must hold rtnl. |
1da177e4 LT |
407 | */ |
408 | static void rlb_clear_slave(struct bonding *bond, struct slave *slave) | |
409 | { | |
410 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
411 | struct rlb_client_info *rx_hash_table; | |
412 | u32 index, next_index; | |
413 | ||
414 | /* clear slave from rx_hashtbl */ | |
4bab16d7 | 415 | spin_lock_bh(&bond->mode_lock); |
1da177e4 LT |
416 | |
417 | rx_hash_table = bond_info->rx_hashtbl; | |
e53665c6 | 418 | index = bond_info->rx_hashtbl_used_head; |
1da177e4 | 419 | for (; index != RLB_NULL_INDEX; index = next_index) { |
e53665c6 | 420 | next_index = rx_hash_table[index].used_next; |
1da177e4 LT |
421 | if (rx_hash_table[index].slave == slave) { |
422 | struct slave *assigned_slave = rlb_next_rx_slave(bond); | |
423 | ||
424 | if (assigned_slave) { | |
425 | rx_hash_table[index].slave = assigned_slave; | |
a6700db1 JP |
426 | if (!ether_addr_equal_64bits(rx_hash_table[index].mac_dst, |
427 | mac_bcast)) { | |
1da177e4 LT |
428 | bond_info->rx_hashtbl[index].ntt = 1; |
429 | bond_info->rx_ntt = 1; | |
430 | /* A slave has been removed from the | |
431 | * table because it is either disabled | |
432 | * or being released. We must retry the | |
433 | * update to avoid clients from not | |
434 | * being updated & disconnecting when | |
435 | * there is stress | |
436 | */ | |
437 | bond_info->rlb_update_retry_counter = | |
438 | RLB_UPDATE_RETRY; | |
439 | } | |
440 | } else { /* there is no active slave */ | |
441 | rx_hash_table[index].slave = NULL; | |
442 | } | |
443 | } | |
444 | } | |
445 | ||
4bab16d7 | 446 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 | 447 | |
1c72cfdc | 448 | if (slave != rtnl_dereference(bond->curr_active_slave)) |
1da177e4 | 449 | rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr); |
1da177e4 LT |
450 | } |
451 | ||
452 | static void rlb_update_client(struct rlb_client_info *client_info) | |
453 | { | |
454 | int i; | |
455 | ||
35d75ee4 | 456 | if (!client_info->slave) |
1da177e4 | 457 | return; |
1da177e4 LT |
458 | |
459 | for (i = 0; i < RLB_ARP_BURST_SIZE; i++) { | |
460 | struct sk_buff *skb; | |
461 | ||
462 | skb = arp_create(ARPOP_REPLY, ETH_P_ARP, | |
463 | client_info->ip_dst, | |
464 | client_info->slave->dev, | |
465 | client_info->ip_src, | |
466 | client_info->mac_dst, | |
467 | client_info->slave->dev->dev_addr, | |
468 | client_info->mac_dst); | |
469 | if (!skb) { | |
0a111a03 VF |
470 | netdev_err(client_info->slave->bond->dev, |
471 | "failed to create an ARP packet\n"); | |
1da177e4 LT |
472 | continue; |
473 | } | |
474 | ||
475 | skb->dev = client_info->slave->dev; | |
476 | ||
d3ab3ffd | 477 | if (client_info->vlan_id) { |
b4bef1b5 JP |
478 | __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), |
479 | client_info->vlan_id); | |
1da177e4 LT |
480 | } |
481 | ||
482 | arp_xmit(skb); | |
483 | } | |
484 | } | |
485 | ||
486 | /* sends ARP REPLIES that update the clients that need updating */ | |
487 | static void rlb_update_rx_clients(struct bonding *bond) | |
488 | { | |
489 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
490 | struct rlb_client_info *client_info; | |
491 | u32 hash_index; | |
492 | ||
4bab16d7 | 493 | spin_lock_bh(&bond->mode_lock); |
1da177e4 | 494 | |
e53665c6 JB |
495 | hash_index = bond_info->rx_hashtbl_used_head; |
496 | for (; hash_index != RLB_NULL_INDEX; | |
497 | hash_index = client_info->used_next) { | |
1da177e4 LT |
498 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
499 | if (client_info->ntt) { | |
500 | rlb_update_client(client_info); | |
35d75ee4 | 501 | if (bond_info->rlb_update_retry_counter == 0) |
1da177e4 | 502 | client_info->ntt = 0; |
1da177e4 LT |
503 | } |
504 | } | |
505 | ||
94e2bd68 | 506 | /* do not update the entries again until this counter is zero so that |
1da177e4 LT |
507 | * not to confuse the clients. |
508 | */ | |
509 | bond_info->rlb_update_delay_counter = RLB_UPDATE_DELAY; | |
510 | ||
4bab16d7 | 511 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 LT |
512 | } |
513 | ||
514 | /* The slave was assigned a new mac address - update the clients */ | |
515 | static void rlb_req_update_slave_clients(struct bonding *bond, struct slave *slave) | |
516 | { | |
517 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
518 | struct rlb_client_info *client_info; | |
519 | int ntt = 0; | |
520 | u32 hash_index; | |
521 | ||
4bab16d7 | 522 | spin_lock_bh(&bond->mode_lock); |
1da177e4 | 523 | |
e53665c6 JB |
524 | hash_index = bond_info->rx_hashtbl_used_head; |
525 | for (; hash_index != RLB_NULL_INDEX; | |
526 | hash_index = client_info->used_next) { | |
1da177e4 LT |
527 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
528 | ||
529 | if ((client_info->slave == slave) && | |
a6700db1 | 530 | !ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) { |
1da177e4 LT |
531 | client_info->ntt = 1; |
532 | ntt = 1; | |
533 | } | |
534 | } | |
535 | ||
4708a1b1 | 536 | /* update the team's flag only after the whole iteration */ |
1da177e4 LT |
537 | if (ntt) { |
538 | bond_info->rx_ntt = 1; | |
4708a1b1 | 539 | /* fasten the change */ |
1da177e4 LT |
540 | bond_info->rlb_update_retry_counter = RLB_UPDATE_RETRY; |
541 | } | |
542 | ||
4bab16d7 | 543 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 LT |
544 | } |
545 | ||
546 | /* mark all clients using src_ip to be updated */ | |
d3bb52b0 | 547 | static void rlb_req_update_subnet_clients(struct bonding *bond, __be32 src_ip) |
1da177e4 LT |
548 | { |
549 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
550 | struct rlb_client_info *client_info; | |
551 | u32 hash_index; | |
552 | ||
4bab16d7 | 553 | spin_lock(&bond->mode_lock); |
1da177e4 | 554 | |
e53665c6 JB |
555 | hash_index = bond_info->rx_hashtbl_used_head; |
556 | for (; hash_index != RLB_NULL_INDEX; | |
557 | hash_index = client_info->used_next) { | |
1da177e4 LT |
558 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
559 | ||
560 | if (!client_info->slave) { | |
0a111a03 | 561 | netdev_err(bond->dev, "found a client with no channel in the client's hash table\n"); |
1da177e4 LT |
562 | continue; |
563 | } | |
547942ca | 564 | /* update all clients using this src_ip, that are not assigned |
1da177e4 LT |
565 | * to the team's address (curr_active_slave) and have a known |
566 | * unicast mac address. | |
567 | */ | |
568 | if ((client_info->ip_src == src_ip) && | |
a6700db1 JP |
569 | !ether_addr_equal_64bits(client_info->slave->dev->dev_addr, |
570 | bond->dev->dev_addr) && | |
571 | !ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) { | |
1da177e4 LT |
572 | client_info->ntt = 1; |
573 | bond_info->rx_ntt = 1; | |
574 | } | |
575 | } | |
576 | ||
4bab16d7 | 577 | spin_unlock(&bond->mode_lock); |
1da177e4 LT |
578 | } |
579 | ||
1da177e4 LT |
580 | static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bond) |
581 | { | |
582 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
a16aeb36 | 583 | struct arp_pkt *arp = arp_pkt(skb); |
28c71926 | 584 | struct slave *assigned_slave, *curr_active_slave; |
1da177e4 LT |
585 | struct rlb_client_info *client_info; |
586 | u32 hash_index = 0; | |
587 | ||
4bab16d7 | 588 | spin_lock(&bond->mode_lock); |
1da177e4 | 589 | |
28c71926 | 590 | curr_active_slave = rcu_dereference(bond->curr_active_slave); |
591 | ||
e364a341 | 592 | hash_index = _simple_hash((u8 *)&arp->ip_dst, sizeof(arp->ip_dst)); |
1da177e4 LT |
593 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
594 | ||
595 | if (client_info->assigned) { | |
596 | if ((client_info->ip_src == arp->ip_src) && | |
597 | (client_info->ip_dst == arp->ip_dst)) { | |
598 | /* the entry is already assigned to this client */ | |
a6700db1 | 599 | if (!ether_addr_equal_64bits(arp->mac_dst, mac_bcast)) { |
1da177e4 | 600 | /* update mac address from arp */ |
ada0f863 | 601 | ether_addr_copy(client_info->mac_dst, arp->mac_dst); |
1da177e4 | 602 | } |
ada0f863 | 603 | ether_addr_copy(client_info->mac_src, arp->mac_src); |
1da177e4 LT |
604 | |
605 | assigned_slave = client_info->slave; | |
606 | if (assigned_slave) { | |
4bab16d7 | 607 | spin_unlock(&bond->mode_lock); |
1da177e4 LT |
608 | return assigned_slave; |
609 | } | |
610 | } else { | |
611 | /* the entry is already assigned to some other client, | |
612 | * move the old client to primary (curr_active_slave) so | |
613 | * that the new client can be assigned to this entry. | |
614 | */ | |
4740d638 | 615 | if (curr_active_slave && |
28c71926 | 616 | client_info->slave != curr_active_slave) { |
617 | client_info->slave = curr_active_slave; | |
1da177e4 LT |
618 | rlb_update_client(client_info); |
619 | } | |
620 | } | |
621 | } | |
622 | /* assign a new slave */ | |
28c71926 | 623 | assigned_slave = __rlb_next_rx_slave(bond); |
1da177e4 LT |
624 | |
625 | if (assigned_slave) { | |
e53665c6 JB |
626 | if (!(client_info->assigned && |
627 | client_info->ip_src == arp->ip_src)) { | |
628 | /* ip_src is going to be updated, | |
629 | * fix the src hash list | |
630 | */ | |
631 | u32 hash_src = _simple_hash((u8 *)&arp->ip_src, | |
632 | sizeof(arp->ip_src)); | |
633 | rlb_src_unlink(bond, hash_index); | |
634 | rlb_src_link(bond, hash_src, hash_index); | |
635 | } | |
636 | ||
1da177e4 LT |
637 | client_info->ip_src = arp->ip_src; |
638 | client_info->ip_dst = arp->ip_dst; | |
639 | /* arp->mac_dst is broadcast for arp reqeusts. | |
640 | * will be updated with clients actual unicast mac address | |
641 | * upon receiving an arp reply. | |
642 | */ | |
ada0f863 JP |
643 | ether_addr_copy(client_info->mac_dst, arp->mac_dst); |
644 | ether_addr_copy(client_info->mac_src, arp->mac_src); | |
1da177e4 LT |
645 | client_info->slave = assigned_slave; |
646 | ||
a6700db1 | 647 | if (!ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) { |
1da177e4 LT |
648 | client_info->ntt = 1; |
649 | bond->alb_info.rx_ntt = 1; | |
650 | } else { | |
651 | client_info->ntt = 0; | |
652 | } | |
653 | ||
fb00bc2e | 654 | if (vlan_get_tag(skb, &client_info->vlan_id)) |
d3ab3ffd | 655 | client_info->vlan_id = 0; |
1da177e4 LT |
656 | |
657 | if (!client_info->assigned) { | |
e53665c6 JB |
658 | u32 prev_tbl_head = bond_info->rx_hashtbl_used_head; |
659 | bond_info->rx_hashtbl_used_head = hash_index; | |
660 | client_info->used_next = prev_tbl_head; | |
1da177e4 | 661 | if (prev_tbl_head != RLB_NULL_INDEX) { |
e53665c6 | 662 | bond_info->rx_hashtbl[prev_tbl_head].used_prev = |
1da177e4 LT |
663 | hash_index; |
664 | } | |
665 | client_info->assigned = 1; | |
666 | } | |
667 | } | |
668 | ||
4bab16d7 | 669 | spin_unlock(&bond->mode_lock); |
1da177e4 LT |
670 | |
671 | return assigned_slave; | |
672 | } | |
673 | ||
674 | /* chooses (and returns) transmit channel for arp reply | |
675 | * does not choose channel for other arp types since they are | |
676 | * sent on the curr_active_slave | |
677 | */ | |
678 | static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond) | |
679 | { | |
a16aeb36 | 680 | struct arp_pkt *arp = arp_pkt(skb); |
1da177e4 LT |
681 | struct slave *tx_slave = NULL; |
682 | ||
567b871e | 683 | /* Don't modify or load balance ARPs that do not originate locally |
684 | * (e.g.,arrive via a bridge). | |
685 | */ | |
14af9963 | 686 | if (!bond_slave_has_mac_rx(bond, arp->mac_src)) |
567b871e | 687 | return NULL; |
688 | ||
f14c4e4e | 689 | if (arp->op_code == htons(ARPOP_REPLY)) { |
547942ca | 690 | /* the arp must be sent on the selected rx channel */ |
1da177e4 | 691 | tx_slave = rlb_choose_channel(skb, bond); |
35d75ee4 | 692 | if (tx_slave) |
ada0f863 | 693 | ether_addr_copy(arp->mac_src, tx_slave->dev->dev_addr); |
0a111a03 | 694 | netdev_dbg(bond->dev, "Server sent ARP Reply packet\n"); |
f14c4e4e | 695 | } else if (arp->op_code == htons(ARPOP_REQUEST)) { |
1da177e4 LT |
696 | /* Create an entry in the rx_hashtbl for this client as a |
697 | * place holder. | |
698 | * When the arp reply is received the entry will be updated | |
699 | * with the correct unicast address of the client. | |
700 | */ | |
701 | rlb_choose_channel(skb, bond); | |
702 | ||
77c8e2c0 | 703 | /* The ARP reply packets must be delayed so that |
1da177e4 LT |
704 | * they can cancel out the influence of the ARP request. |
705 | */ | |
706 | bond->alb_info.rlb_update_delay_counter = RLB_UPDATE_DELAY; | |
707 | ||
708 | /* arp requests are broadcast and are sent on the primary | |
709 | * the arp request will collapse all clients on the subnet to | |
710 | * the primary slave. We must register these clients to be | |
711 | * updated with their assigned mac. | |
712 | */ | |
713 | rlb_req_update_subnet_clients(bond, arp->ip_src); | |
0a111a03 | 714 | netdev_dbg(bond->dev, "Server sent ARP Request packet\n"); |
1da177e4 LT |
715 | } |
716 | ||
717 | return tx_slave; | |
718 | } | |
719 | ||
1da177e4 LT |
720 | static void rlb_rebalance(struct bonding *bond) |
721 | { | |
722 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
723 | struct slave *assigned_slave; | |
724 | struct rlb_client_info *client_info; | |
725 | int ntt; | |
726 | u32 hash_index; | |
727 | ||
4bab16d7 | 728 | spin_lock_bh(&bond->mode_lock); |
1da177e4 LT |
729 | |
730 | ntt = 0; | |
e53665c6 JB |
731 | hash_index = bond_info->rx_hashtbl_used_head; |
732 | for (; hash_index != RLB_NULL_INDEX; | |
733 | hash_index = client_info->used_next) { | |
1da177e4 | 734 | client_info = &(bond_info->rx_hashtbl[hash_index]); |
733ab639 | 735 | assigned_slave = __rlb_next_rx_slave(bond); |
1da177e4 LT |
736 | if (assigned_slave && (client_info->slave != assigned_slave)) { |
737 | client_info->slave = assigned_slave; | |
738 | client_info->ntt = 1; | |
739 | ntt = 1; | |
740 | } | |
741 | } | |
742 | ||
743 | /* update the team's flag only after the whole iteration */ | |
35d75ee4 | 744 | if (ntt) |
1da177e4 | 745 | bond_info->rx_ntt = 1; |
4bab16d7 | 746 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 LT |
747 | } |
748 | ||
547942ca | 749 | /* Caller must hold mode_lock */ |
e53665c6 JB |
750 | static void rlb_init_table_entry_dst(struct rlb_client_info *entry) |
751 | { | |
752 | entry->used_next = RLB_NULL_INDEX; | |
753 | entry->used_prev = RLB_NULL_INDEX; | |
754 | entry->assigned = 0; | |
755 | entry->slave = NULL; | |
d3ab3ffd | 756 | entry->vlan_id = 0; |
e53665c6 JB |
757 | } |
758 | static void rlb_init_table_entry_src(struct rlb_client_info *entry) | |
759 | { | |
760 | entry->src_first = RLB_NULL_INDEX; | |
761 | entry->src_prev = RLB_NULL_INDEX; | |
762 | entry->src_next = RLB_NULL_INDEX; | |
763 | } | |
764 | ||
1da177e4 LT |
765 | static void rlb_init_table_entry(struct rlb_client_info *entry) |
766 | { | |
767 | memset(entry, 0, sizeof(struct rlb_client_info)); | |
e53665c6 JB |
768 | rlb_init_table_entry_dst(entry); |
769 | rlb_init_table_entry_src(entry); | |
770 | } | |
771 | ||
772 | static void rlb_delete_table_entry_dst(struct bonding *bond, u32 index) | |
773 | { | |
774 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
775 | u32 next_index = bond_info->rx_hashtbl[index].used_next; | |
776 | u32 prev_index = bond_info->rx_hashtbl[index].used_prev; | |
777 | ||
778 | if (index == bond_info->rx_hashtbl_used_head) | |
779 | bond_info->rx_hashtbl_used_head = next_index; | |
780 | if (prev_index != RLB_NULL_INDEX) | |
781 | bond_info->rx_hashtbl[prev_index].used_next = next_index; | |
782 | if (next_index != RLB_NULL_INDEX) | |
783 | bond_info->rx_hashtbl[next_index].used_prev = prev_index; | |
784 | } | |
785 | ||
786 | /* unlink a rlb hash table entry from the src list */ | |
787 | static void rlb_src_unlink(struct bonding *bond, u32 index) | |
788 | { | |
789 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
790 | u32 next_index = bond_info->rx_hashtbl[index].src_next; | |
791 | u32 prev_index = bond_info->rx_hashtbl[index].src_prev; | |
792 | ||
793 | bond_info->rx_hashtbl[index].src_next = RLB_NULL_INDEX; | |
794 | bond_info->rx_hashtbl[index].src_prev = RLB_NULL_INDEX; | |
795 | ||
796 | if (next_index != RLB_NULL_INDEX) | |
797 | bond_info->rx_hashtbl[next_index].src_prev = prev_index; | |
798 | ||
799 | if (prev_index == RLB_NULL_INDEX) | |
800 | return; | |
801 | ||
802 | /* is prev_index pointing to the head of this list? */ | |
803 | if (bond_info->rx_hashtbl[prev_index].src_first == index) | |
804 | bond_info->rx_hashtbl[prev_index].src_first = next_index; | |
805 | else | |
806 | bond_info->rx_hashtbl[prev_index].src_next = next_index; | |
807 | ||
808 | } | |
809 | ||
810 | static void rlb_delete_table_entry(struct bonding *bond, u32 index) | |
811 | { | |
812 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
813 | struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]); | |
814 | ||
815 | rlb_delete_table_entry_dst(bond, index); | |
816 | rlb_init_table_entry_dst(entry); | |
817 | ||
818 | rlb_src_unlink(bond, index); | |
819 | } | |
820 | ||
821 | /* add the rx_hashtbl[ip_dst_hash] entry to the list | |
822 | * of entries with identical ip_src_hash | |
823 | */ | |
824 | static void rlb_src_link(struct bonding *bond, u32 ip_src_hash, u32 ip_dst_hash) | |
825 | { | |
826 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
827 | u32 next; | |
828 | ||
829 | bond_info->rx_hashtbl[ip_dst_hash].src_prev = ip_src_hash; | |
830 | next = bond_info->rx_hashtbl[ip_src_hash].src_first; | |
831 | bond_info->rx_hashtbl[ip_dst_hash].src_next = next; | |
832 | if (next != RLB_NULL_INDEX) | |
833 | bond_info->rx_hashtbl[next].src_prev = ip_dst_hash; | |
834 | bond_info->rx_hashtbl[ip_src_hash].src_first = ip_dst_hash; | |
835 | } | |
836 | ||
547942ca NA |
837 | /* deletes all rx_hashtbl entries with arp->ip_src if their mac_src does |
838 | * not match arp->mac_src | |
839 | */ | |
e53665c6 JB |
840 | static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp) |
841 | { | |
842 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
b85b6fb1 | 843 | u32 ip_src_hash = _simple_hash((u8 *)&(arp->ip_src), sizeof(arp->ip_src)); |
e53665c6 JB |
844 | u32 index; |
845 | ||
4bab16d7 | 846 | spin_lock_bh(&bond->mode_lock); |
e53665c6 JB |
847 | |
848 | index = bond_info->rx_hashtbl[ip_src_hash].src_first; | |
849 | while (index != RLB_NULL_INDEX) { | |
850 | struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]); | |
851 | u32 next_index = entry->src_next; | |
852 | if (entry->ip_src == arp->ip_src && | |
853 | !ether_addr_equal_64bits(arp->mac_src, entry->mac_src)) | |
854 | rlb_delete_table_entry(bond, index); | |
855 | index = next_index; | |
856 | } | |
4bab16d7 | 857 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 LT |
858 | } |
859 | ||
860 | static int rlb_initialize(struct bonding *bond) | |
861 | { | |
862 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
0d206a3a | 863 | struct rlb_client_info *new_hashtbl; |
1da177e4 LT |
864 | int size = RLB_HASH_TABLE_SIZE * sizeof(struct rlb_client_info); |
865 | int i; | |
866 | ||
0d206a3a | 867 | new_hashtbl = kmalloc(size, GFP_KERNEL); |
e404decb | 868 | if (!new_hashtbl) |
1da177e4 | 869 | return -1; |
e404decb | 870 | |
4bab16d7 | 871 | spin_lock_bh(&bond->mode_lock); |
0d206a3a MW |
872 | |
873 | bond_info->rx_hashtbl = new_hashtbl; | |
1da177e4 | 874 | |
e53665c6 | 875 | bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX; |
1da177e4 | 876 | |
35d75ee4 | 877 | for (i = 0; i < RLB_HASH_TABLE_SIZE; i++) |
1da177e4 | 878 | rlb_init_table_entry(bond_info->rx_hashtbl + i); |
1da177e4 | 879 | |
4bab16d7 | 880 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 | 881 | |
1da177e4 | 882 | /* register to receive ARPs */ |
3aba891d | 883 | bond->recv_probe = rlb_arp_recv; |
1da177e4 LT |
884 | |
885 | return 0; | |
886 | } | |
887 | ||
888 | static void rlb_deinitialize(struct bonding *bond) | |
889 | { | |
890 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
891 | ||
4bab16d7 | 892 | spin_lock_bh(&bond->mode_lock); |
1da177e4 LT |
893 | |
894 | kfree(bond_info->rx_hashtbl); | |
895 | bond_info->rx_hashtbl = NULL; | |
e53665c6 | 896 | bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX; |
1da177e4 | 897 | |
4bab16d7 | 898 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 LT |
899 | } |
900 | ||
901 | static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id) | |
902 | { | |
903 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
904 | u32 curr_index; | |
905 | ||
4bab16d7 | 906 | spin_lock_bh(&bond->mode_lock); |
1da177e4 | 907 | |
e53665c6 | 908 | curr_index = bond_info->rx_hashtbl_used_head; |
1da177e4 LT |
909 | while (curr_index != RLB_NULL_INDEX) { |
910 | struct rlb_client_info *curr = &(bond_info->rx_hashtbl[curr_index]); | |
e53665c6 | 911 | u32 next_index = bond_info->rx_hashtbl[curr_index].used_next; |
1da177e4 | 912 | |
d3ab3ffd | 913 | if (curr->vlan_id == vlan_id) |
e53665c6 | 914 | rlb_delete_table_entry(bond, curr_index); |
1da177e4 LT |
915 | |
916 | curr_index = next_index; | |
917 | } | |
918 | ||
4bab16d7 | 919 | spin_unlock_bh(&bond->mode_lock); |
1da177e4 LT |
920 | } |
921 | ||
922 | /*********************** tlb/rlb shared functions *********************/ | |
923 | ||
7aa64981 | 924 | static void alb_send_lp_vid(struct slave *slave, u8 mac_addr[], |
d6b694c0 | 925 | __be16 vlan_proto, u16 vid) |
1da177e4 | 926 | { |
1da177e4 | 927 | struct learning_pkt pkt; |
7aa64981 | 928 | struct sk_buff *skb; |
1da177e4 | 929 | int size = sizeof(struct learning_pkt); |
7aa64981 | 930 | char *data; |
1da177e4 LT |
931 | |
932 | memset(&pkt, 0, size); | |
ada0f863 JP |
933 | ether_addr_copy(pkt.mac_dst, mac_addr); |
934 | ether_addr_copy(pkt.mac_src, mac_addr); | |
96a0922c | 935 | pkt.type = cpu_to_be16(ETH_P_LOOPBACK); |
1da177e4 | 936 | |
7aa64981 VF |
937 | skb = dev_alloc_skb(size); |
938 | if (!skb) | |
939 | return; | |
1da177e4 | 940 | |
7aa64981 VF |
941 | data = skb_put(skb, size); |
942 | memcpy(data, &pkt, size); | |
943 | ||
944 | skb_reset_mac_header(skb); | |
945 | skb->network_header = skb->mac_header + ETH_HLEN; | |
946 | skb->protocol = pkt.type; | |
947 | skb->priority = TC_PRIO_CONTROL; | |
948 | skb->dev = slave->dev; | |
949 | ||
b4bef1b5 JP |
950 | if (vid) |
951 | __vlan_hwaccel_put_tag(skb, vlan_proto, vid); | |
7aa64981 VF |
952 | |
953 | dev_queue_xmit(skb); | |
954 | } | |
1da177e4 | 955 | |
d0c21d43 VY |
956 | static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[], |
957 | bool strict_match) | |
7aa64981 VF |
958 | { |
959 | struct bonding *bond = bond_get_bond_by_slave(slave); | |
5bf94b83 VF |
960 | struct net_device *upper; |
961 | struct list_head *iter; | |
3e403a77 | 962 | struct bond_vlan_tag *tags; |
5bf94b83 VF |
963 | |
964 | /* send untagged */ | |
d6b694c0 | 965 | alb_send_lp_vid(slave, mac_addr, 0, 0); |
5bf94b83 | 966 | |
14af9963 VY |
967 | /* loop through all devices and see if we need to send a packet |
968 | * for that device. | |
969 | */ | |
5bf94b83 | 970 | rcu_read_lock(); |
2f268f12 | 971 | netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) { |
d0c21d43 VY |
972 | if (is_vlan_dev(upper) && vlan_get_encap_level(upper) == 0) { |
973 | if (strict_match && | |
974 | ether_addr_equal_64bits(mac_addr, | |
975 | upper->dev_addr)) { | |
976 | alb_send_lp_vid(slave, mac_addr, | |
977 | vlan_dev_vlan_proto(upper), | |
978 | vlan_dev_vlan_id(upper)); | |
979 | } else if (!strict_match) { | |
980 | alb_send_lp_vid(slave, upper->dev_addr, | |
981 | vlan_dev_vlan_proto(upper), | |
982 | vlan_dev_vlan_id(upper)); | |
983 | } | |
984 | } | |
14af9963 VY |
985 | |
986 | /* If this is a macvlan device, then only send updates | |
987 | * when strict_match is turned off. | |
988 | */ | |
989 | if (netif_is_macvlan(upper) && !strict_match) { | |
3e403a77 VF |
990 | tags = bond_verify_device_path(bond->dev, upper, 0); |
991 | if (IS_ERR_OR_NULL(tags)) | |
992 | BUG(); | |
14af9963 VY |
993 | alb_send_lp_vid(slave, upper->dev_addr, |
994 | tags[0].vlan_proto, tags[0].vlan_id); | |
3e403a77 | 995 | kfree(tags); |
14af9963 | 996 | } |
1da177e4 | 997 | } |
5bf94b83 | 998 | rcu_read_unlock(); |
1da177e4 LT |
999 | } |
1000 | ||
b924551b | 1001 | static int alb_set_slave_mac_addr(struct slave *slave, u8 addr[]) |
1da177e4 LT |
1002 | { |
1003 | struct net_device *dev = slave->dev; | |
1004 | struct sockaddr s_addr; | |
1005 | ||
01844098 | 1006 | if (BOND_MODE(slave->bond) == BOND_MODE_TLB) { |
1da177e4 LT |
1007 | memcpy(dev->dev_addr, addr, dev->addr_len); |
1008 | return 0; | |
1009 | } | |
1010 | ||
547942ca NA |
1011 | /* for rlb each slave must have a unique hw mac addresses so that |
1012 | * each slave will receive packets destined to a different mac | |
1013 | */ | |
1da177e4 LT |
1014 | memcpy(s_addr.sa_data, addr, dev->addr_len); |
1015 | s_addr.sa_family = dev->type; | |
1016 | if (dev_set_mac_address(dev, &s_addr)) { | |
0a111a03 VF |
1017 | netdev_err(slave->bond->dev, "dev_set_mac_address of dev %s failed! ALB mode requires that the base driver support setting the hw address also when the network device's interface is open\n", |
1018 | dev->name); | |
1da177e4 LT |
1019 | return -EOPNOTSUPP; |
1020 | } | |
1021 | return 0; | |
1022 | } | |
1023 | ||
547942ca | 1024 | /* Swap MAC addresses between two slaves. |
059fe7a5 JV |
1025 | * |
1026 | * Called with RTNL held, and no other locks. | |
059fe7a5 | 1027 | */ |
43547ea6 | 1028 | static void alb_swap_mac_addr(struct slave *slave1, struct slave *slave2) |
1da177e4 | 1029 | { |
1da177e4 | 1030 | u8 tmp_mac_addr[ETH_ALEN]; |
1da177e4 | 1031 | |
ada0f863 | 1032 | ether_addr_copy(tmp_mac_addr, slave1->dev->dev_addr); |
b924551b JB |
1033 | alb_set_slave_mac_addr(slave1, slave2->dev->dev_addr); |
1034 | alb_set_slave_mac_addr(slave2, tmp_mac_addr); | |
1da177e4 | 1035 | |
059fe7a5 JV |
1036 | } |
1037 | ||
547942ca | 1038 | /* Send learning packets after MAC address swap. |
059fe7a5 | 1039 | * |
2543331d | 1040 | * Called with RTNL and no other locks |
059fe7a5 JV |
1041 | */ |
1042 | static void alb_fasten_mac_swap(struct bonding *bond, struct slave *slave1, | |
1043 | struct slave *slave2) | |
1044 | { | |
8557cd74 | 1045 | int slaves_state_differ = (bond_slave_can_tx(slave1) != bond_slave_can_tx(slave2)); |
059fe7a5 JV |
1046 | struct slave *disabled_slave = NULL; |
1047 | ||
2543331d JV |
1048 | ASSERT_RTNL(); |
1049 | ||
1da177e4 | 1050 | /* fasten the change in the switch */ |
8557cd74 | 1051 | if (bond_slave_can_tx(slave1)) { |
d0c21d43 | 1052 | alb_send_learning_packets(slave1, slave1->dev->dev_addr, false); |
1da177e4 LT |
1053 | if (bond->alb_info.rlb_enabled) { |
1054 | /* inform the clients that the mac address | |
1055 | * has changed | |
1056 | */ | |
1057 | rlb_req_update_slave_clients(bond, slave1); | |
1058 | } | |
1059 | } else { | |
1060 | disabled_slave = slave1; | |
1061 | } | |
1062 | ||
8557cd74 | 1063 | if (bond_slave_can_tx(slave2)) { |
d0c21d43 | 1064 | alb_send_learning_packets(slave2, slave2->dev->dev_addr, false); |
1da177e4 LT |
1065 | if (bond->alb_info.rlb_enabled) { |
1066 | /* inform the clients that the mac address | |
1067 | * has changed | |
1068 | */ | |
1069 | rlb_req_update_slave_clients(bond, slave2); | |
1070 | } | |
1071 | } else { | |
1072 | disabled_slave = slave2; | |
1073 | } | |
1074 | ||
1075 | if (bond->alb_info.rlb_enabled && slaves_state_differ) { | |
1076 | /* A disabled slave was assigned an active mac addr */ | |
1077 | rlb_teach_disabled_mac_on_primary(bond, | |
1078 | disabled_slave->dev->dev_addr); | |
1079 | } | |
1080 | } | |
1081 | ||
1082 | /** | |
1083 | * alb_change_hw_addr_on_detach | |
1084 | * @bond: bonding we're working on | |
1085 | * @slave: the slave that was just detached | |
1086 | * | |
1087 | * We assume that @slave was already detached from the slave list. | |
1088 | * | |
1089 | * If @slave's permanent hw address is different both from its current | |
1090 | * address and from @bond's address, then somewhere in the bond there's | |
1091 | * a slave that has @slave's permanet address as its current address. | |
1092 | * We'll make sure that that slave no longer uses @slave's permanent address. | |
1093 | * | |
2543331d | 1094 | * Caller must hold RTNL and no other locks |
1da177e4 LT |
1095 | */ |
1096 | static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *slave) | |
1097 | { | |
1098 | int perm_curr_diff; | |
1099 | int perm_bond_diff; | |
b88ec38d | 1100 | struct slave *found_slave; |
1da177e4 | 1101 | |
a6700db1 JP |
1102 | perm_curr_diff = !ether_addr_equal_64bits(slave->perm_hwaddr, |
1103 | slave->dev->dev_addr); | |
1104 | perm_bond_diff = !ether_addr_equal_64bits(slave->perm_hwaddr, | |
1105 | bond->dev->dev_addr); | |
1da177e4 LT |
1106 | |
1107 | if (perm_curr_diff && perm_bond_diff) { | |
b88ec38d | 1108 | found_slave = bond_slave_has_mac(bond, slave->perm_hwaddr); |
1da177e4 | 1109 | |
b88ec38d | 1110 | if (found_slave) { |
b88ec38d VF |
1111 | alb_swap_mac_addr(slave, found_slave); |
1112 | alb_fasten_mac_swap(bond, slave, found_slave); | |
1da177e4 LT |
1113 | } |
1114 | } | |
1115 | } | |
1116 | ||
1117 | /** | |
1118 | * alb_handle_addr_collision_on_attach | |
1119 | * @bond: bonding we're working on | |
1120 | * @slave: the slave that was just attached | |
1121 | * | |
1122 | * checks uniqueness of slave's mac address and handles the case the | |
1123 | * new slave uses the bonds mac address. | |
1124 | * | |
1125 | * If the permanent hw address of @slave is @bond's hw address, we need to | |
1126 | * find a different hw address to give @slave, that isn't in use by any other | |
77c8e2c0 | 1127 | * slave in the bond. This address must be, of course, one of the permanent |
1da177e4 LT |
1128 | * addresses of the other slaves. |
1129 | * | |
1130 | * We go over the slave list, and for each slave there we compare its | |
1131 | * permanent hw address with the current address of all the other slaves. | |
1132 | * If no match was found, then we've found a slave with a permanent address | |
1133 | * that isn't used by any other slave in the bond, so we can assign it to | |
1134 | * @slave. | |
1135 | * | |
1136 | * assumption: this function is called before @slave is attached to the | |
cedb743f | 1137 | * bond slave list. |
1da177e4 LT |
1138 | */ |
1139 | static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slave *slave) | |
1140 | { | |
4740d638 | 1141 | struct slave *has_bond_addr = rcu_access_pointer(bond->curr_active_slave); |
9caff1e7 VF |
1142 | struct slave *tmp_slave1, *free_mac_slave = NULL; |
1143 | struct list_head *iter; | |
1da177e4 | 1144 | |
0965a1f3 | 1145 | if (!bond_has_slaves(bond)) { |
1da177e4 LT |
1146 | /* this is the first slave */ |
1147 | return 0; | |
1148 | } | |
1149 | ||
1150 | /* if slave's mac address differs from bond's mac address | |
1151 | * check uniqueness of slave's mac address against the other | |
1152 | * slaves in the bond. | |
1153 | */ | |
a6700db1 | 1154 | if (!ether_addr_equal_64bits(slave->perm_hwaddr, bond->dev->dev_addr)) { |
cedb743f | 1155 | if (!bond_slave_has_mac(bond, slave->dev->dev_addr)) |
6b38aefe | 1156 | return 0; |
1da177e4 | 1157 | |
6b38aefe | 1158 | /* Try setting slave mac to bond address and fall-through |
547942ca NA |
1159 | * to code handling that situation below... |
1160 | */ | |
b924551b | 1161 | alb_set_slave_mac_addr(slave, bond->dev->dev_addr); |
1da177e4 LT |
1162 | } |
1163 | ||
1164 | /* The slave's address is equal to the address of the bond. | |
1165 | * Search for a spare address in the bond for this slave. | |
1166 | */ | |
9caff1e7 | 1167 | bond_for_each_slave(bond, tmp_slave1, iter) { |
cedb743f | 1168 | if (!bond_slave_has_mac(bond, tmp_slave1->perm_hwaddr)) { |
1da177e4 LT |
1169 | /* no slave has tmp_slave1's perm addr |
1170 | * as its curr addr | |
1171 | */ | |
1172 | free_mac_slave = tmp_slave1; | |
1173 | break; | |
1174 | } | |
1175 | ||
1176 | if (!has_bond_addr) { | |
a6700db1 JP |
1177 | if (ether_addr_equal_64bits(tmp_slave1->dev->dev_addr, |
1178 | bond->dev->dev_addr)) { | |
1da177e4 LT |
1179 | |
1180 | has_bond_addr = tmp_slave1; | |
1181 | } | |
1182 | } | |
1183 | } | |
1184 | ||
1185 | if (free_mac_slave) { | |
b924551b | 1186 | alb_set_slave_mac_addr(slave, free_mac_slave->perm_hwaddr); |
1da177e4 | 1187 | |
0a111a03 VF |
1188 | netdev_warn(bond->dev, "the hw address of slave %s is in use by the bond; giving it the hw address of %s\n", |
1189 | slave->dev->name, free_mac_slave->dev->name); | |
1da177e4 LT |
1190 | |
1191 | } else if (has_bond_addr) { | |
0a111a03 VF |
1192 | netdev_err(bond->dev, "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", |
1193 | slave->dev->name); | |
1da177e4 LT |
1194 | return -EFAULT; |
1195 | } | |
1196 | ||
1197 | return 0; | |
1198 | } | |
1199 | ||
1200 | /** | |
1201 | * alb_set_mac_address | |
1202 | * @bond: | |
1203 | * @addr: | |
1204 | * | |
1205 | * In TLB mode all slaves are configured to the bond's hw address, but set | |
1206 | * their dev_addr field to different addresses (based on their permanent hw | |
1207 | * addresses). | |
1208 | * | |
1209 | * For each slave, this function sets the interface to the new address and then | |
1210 | * changes its dev_addr field to its previous value. | |
1211 | * | |
1212 | * Unwinding assumes bond's mac address has not yet changed. | |
1213 | */ | |
1214 | static int alb_set_mac_address(struct bonding *bond, void *addr) | |
1215 | { | |
81f23b13 | 1216 | struct slave *slave, *rollback_slave; |
9caff1e7 | 1217 | struct list_head *iter; |
dec1e90e | 1218 | struct sockaddr sa; |
81f23b13 | 1219 | char tmp_addr[ETH_ALEN]; |
1da177e4 | 1220 | int res; |
1da177e4 | 1221 | |
dec1e90e | 1222 | if (bond->alb_info.rlb_enabled) |
1da177e4 | 1223 | return 0; |
1da177e4 | 1224 | |
9caff1e7 | 1225 | bond_for_each_slave(bond, slave, iter) { |
1da177e4 | 1226 | /* save net_device's current hw address */ |
ada0f863 | 1227 | ether_addr_copy(tmp_addr, slave->dev->dev_addr); |
1da177e4 LT |
1228 | |
1229 | res = dev_set_mac_address(slave->dev, addr); | |
1230 | ||
1231 | /* restore net_device's hw address */ | |
ada0f863 | 1232 | ether_addr_copy(slave->dev->dev_addr, tmp_addr); |
1da177e4 | 1233 | |
eb7cc59a | 1234 | if (res) |
1da177e4 | 1235 | goto unwind; |
1da177e4 LT |
1236 | } |
1237 | ||
1238 | return 0; | |
1239 | ||
1240 | unwind: | |
1241 | memcpy(sa.sa_data, bond->dev->dev_addr, bond->dev->addr_len); | |
1242 | sa.sa_family = bond->dev->type; | |
1243 | ||
1244 | /* unwind from head to the slave that failed */ | |
9caff1e7 | 1245 | bond_for_each_slave(bond, rollback_slave, iter) { |
81f23b13 VF |
1246 | if (rollback_slave == slave) |
1247 | break; | |
ada0f863 | 1248 | ether_addr_copy(tmp_addr, rollback_slave->dev->dev_addr); |
81f23b13 | 1249 | dev_set_mac_address(rollback_slave->dev, &sa); |
ada0f863 | 1250 | ether_addr_copy(rollback_slave->dev->dev_addr, tmp_addr); |
1da177e4 LT |
1251 | } |
1252 | ||
1253 | return res; | |
1254 | } | |
1255 | ||
1256 | /************************ exported alb funcions ************************/ | |
1257 | ||
1258 | int bond_alb_initialize(struct bonding *bond, int rlb_enabled) | |
1259 | { | |
1260 | int res; | |
1261 | ||
1262 | res = tlb_initialize(bond); | |
35d75ee4 | 1263 | if (res) |
1da177e4 | 1264 | return res; |
1da177e4 LT |
1265 | |
1266 | if (rlb_enabled) { | |
1267 | bond->alb_info.rlb_enabled = 1; | |
1da177e4 LT |
1268 | res = rlb_initialize(bond); |
1269 | if (res) { | |
1270 | tlb_deinitialize(bond); | |
1271 | return res; | |
1272 | } | |
b76850ab MW |
1273 | } else { |
1274 | bond->alb_info.rlb_enabled = 0; | |
1da177e4 LT |
1275 | } |
1276 | ||
1277 | return 0; | |
1278 | } | |
1279 | ||
1280 | void bond_alb_deinitialize(struct bonding *bond) | |
1281 | { | |
1282 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1283 | ||
1284 | tlb_deinitialize(bond); | |
1285 | ||
dda0fd5c | 1286 | if (bond_info->rlb_enabled) |
1da177e4 | 1287 | rlb_deinitialize(bond); |
1da177e4 LT |
1288 | } |
1289 | ||
9a49aba1 | 1290 | static int bond_do_alb_xmit(struct sk_buff *skb, struct bonding *bond, |
547942ca | 1291 | struct slave *tx_slave) |
9a49aba1 MB |
1292 | { |
1293 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1294 | struct ethhdr *eth_data = eth_hdr(skb); | |
1295 | ||
1296 | if (!tx_slave) { | |
1297 | /* unbalanced or unassigned, send through primary */ | |
1298 | tx_slave = rcu_dereference(bond->curr_active_slave); | |
e9f0fb88 MB |
1299 | if (bond->params.tlb_dynamic_lb) |
1300 | bond_info->unbalanced_load += skb->len; | |
9a49aba1 MB |
1301 | } |
1302 | ||
8557cd74 | 1303 | if (tx_slave && bond_slave_can_tx(tx_slave)) { |
b5091b55 | 1304 | if (tx_slave != rcu_access_pointer(bond->curr_active_slave)) { |
9a49aba1 MB |
1305 | ether_addr_copy(eth_data->h_source, |
1306 | tx_slave->dev->dev_addr); | |
1307 | } | |
1308 | ||
1309 | bond_dev_queue_xmit(bond, skb, tx_slave->dev); | |
1310 | goto out; | |
1311 | } | |
1312 | ||
e9f0fb88 | 1313 | if (tx_slave && bond->params.tlb_dynamic_lb) { |
4bab16d7 | 1314 | spin_lock(&bond->mode_lock); |
9a49aba1 | 1315 | __tlb_clear_slave(bond, tx_slave, 0); |
4bab16d7 | 1316 | spin_unlock(&bond->mode_lock); |
9a49aba1 MB |
1317 | } |
1318 | ||
1319 | /* no suitable interface, frame not sent */ | |
31aa860e | 1320 | bond_tx_drop(bond->dev, skb); |
9a49aba1 MB |
1321 | out: |
1322 | return NETDEV_TX_OK; | |
1323 | } | |
1324 | ||
f05b42ea MB |
1325 | int bond_tlb_xmit(struct sk_buff *skb, struct net_device *bond_dev) |
1326 | { | |
1327 | struct bonding *bond = netdev_priv(bond_dev); | |
1328 | struct ethhdr *eth_data; | |
1329 | struct slave *tx_slave = NULL; | |
1330 | u32 hash_index; | |
1331 | ||
1332 | skb_reset_mac_header(skb); | |
1333 | eth_data = eth_hdr(skb); | |
1334 | ||
1335 | /* Do not TX balance any multicast or broadcast */ | |
1336 | if (!is_multicast_ether_addr(eth_data->h_dest)) { | |
1337 | switch (skb->protocol) { | |
1338 | case htons(ETH_P_IP): | |
1339 | case htons(ETH_P_IPX): | |
1340 | /* In case of IPX, it will falback to L2 hash */ | |
1341 | case htons(ETH_P_IPV6): | |
1342 | hash_index = bond_xmit_hash(bond, skb); | |
e9f0fb88 MB |
1343 | if (bond->params.tlb_dynamic_lb) { |
1344 | tx_slave = tlb_choose_channel(bond, | |
1345 | hash_index & 0xFF, | |
1346 | skb->len); | |
1347 | } else { | |
ee637714 MB |
1348 | struct bond_up_slave *slaves; |
1349 | unsigned int count; | |
e9f0fb88 | 1350 | |
ee637714 MB |
1351 | slaves = rcu_dereference(bond->slave_arr); |
1352 | count = slaves ? ACCESS_ONCE(slaves->count) : 0; | |
1353 | if (likely(count)) | |
6b794c1c | 1354 | tx_slave = slaves->arr[hash_index % |
ee637714 | 1355 | count]; |
e9f0fb88 | 1356 | } |
f05b42ea MB |
1357 | break; |
1358 | } | |
1359 | } | |
f05b42ea MB |
1360 | return bond_do_alb_xmit(skb, bond, tx_slave); |
1361 | } | |
1362 | ||
1da177e4 LT |
1363 | int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev) |
1364 | { | |
454d7c9b | 1365 | struct bonding *bond = netdev_priv(bond_dev); |
1da177e4 LT |
1366 | struct ethhdr *eth_data; |
1367 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1368 | struct slave *tx_slave = NULL; | |
d3bb52b0 | 1369 | static const __be32 ip_bcast = htonl(0xffffffff); |
1da177e4 | 1370 | int hash_size = 0; |
9a49aba1 | 1371 | bool do_tx_balance = true; |
1da177e4 | 1372 | u32 hash_index = 0; |
eddc9ec5 | 1373 | const u8 *hash_start = NULL; |
2d1ea19d | 1374 | struct ipv6hdr *ip6hdr; |
1da177e4 | 1375 | |
459a98ed | 1376 | skb_reset_mac_header(skb); |
1da177e4 LT |
1377 | eth_data = eth_hdr(skb); |
1378 | ||
1da177e4 | 1379 | switch (ntohs(skb->protocol)) { |
eddc9ec5 ACM |
1380 | case ETH_P_IP: { |
1381 | const struct iphdr *iph = ip_hdr(skb); | |
1382 | ||
a6700db1 | 1383 | if (ether_addr_equal_64bits(eth_data->h_dest, mac_bcast) || |
eddc9ec5 ACM |
1384 | (iph->daddr == ip_bcast) || |
1385 | (iph->protocol == IPPROTO_IGMP)) { | |
9a49aba1 | 1386 | do_tx_balance = false; |
1da177e4 LT |
1387 | break; |
1388 | } | |
eddc9ec5 ACM |
1389 | hash_start = (char *)&(iph->daddr); |
1390 | hash_size = sizeof(iph->daddr); | |
1391 | } | |
1da177e4 LT |
1392 | break; |
1393 | case ETH_P_IPV6: | |
2d1ea19d VY |
1394 | /* IPv6 doesn't really use broadcast mac address, but leave |
1395 | * that here just in case. | |
1396 | */ | |
a6700db1 | 1397 | if (ether_addr_equal_64bits(eth_data->h_dest, mac_bcast)) { |
9a49aba1 | 1398 | do_tx_balance = false; |
1da177e4 | 1399 | break; |
2d1ea19d VY |
1400 | } |
1401 | ||
1402 | /* IPv6 uses all-nodes multicast as an equivalent to | |
1403 | * broadcasts in IPv4. | |
1404 | */ | |
a6700db1 | 1405 | if (ether_addr_equal_64bits(eth_data->h_dest, mac_v6_allmcast)) { |
9a49aba1 | 1406 | do_tx_balance = false; |
2d1ea19d VY |
1407 | break; |
1408 | } | |
1409 | ||
1410 | /* Additianally, DAD probes should not be tx-balanced as that | |
1411 | * will lead to false positives for duplicate addresses and | |
1412 | * prevent address configuration from working. | |
1413 | */ | |
1414 | ip6hdr = ipv6_hdr(skb); | |
1415 | if (ipv6_addr_any(&ip6hdr->saddr)) { | |
9a49aba1 | 1416 | do_tx_balance = false; |
2d1ea19d | 1417 | break; |
1da177e4 LT |
1418 | } |
1419 | ||
0660e03f ACM |
1420 | hash_start = (char *)&(ipv6_hdr(skb)->daddr); |
1421 | hash_size = sizeof(ipv6_hdr(skb)->daddr); | |
1da177e4 LT |
1422 | break; |
1423 | case ETH_P_IPX: | |
d3bb52b0 | 1424 | if (ipx_hdr(skb)->ipx_checksum != IPX_NO_CHECKSUM) { |
1da177e4 | 1425 | /* something is wrong with this packet */ |
9a49aba1 | 1426 | do_tx_balance = false; |
1da177e4 LT |
1427 | break; |
1428 | } | |
1429 | ||
1430 | if (ipx_hdr(skb)->ipx_type != IPX_TYPE_NCP) { | |
1431 | /* The only protocol worth balancing in | |
1432 | * this family since it has an "ARP" like | |
1433 | * mechanism | |
1434 | */ | |
9a49aba1 | 1435 | do_tx_balance = false; |
1da177e4 LT |
1436 | break; |
1437 | } | |
1438 | ||
b85b6fb1 | 1439 | hash_start = (char *)eth_data->h_dest; |
1da177e4 LT |
1440 | hash_size = ETH_ALEN; |
1441 | break; | |
1442 | case ETH_P_ARP: | |
9a49aba1 | 1443 | do_tx_balance = false; |
dda0fd5c | 1444 | if (bond_info->rlb_enabled) |
1da177e4 | 1445 | tx_slave = rlb_arp_xmit(skb, bond); |
1da177e4 LT |
1446 | break; |
1447 | default: | |
9a49aba1 | 1448 | do_tx_balance = false; |
1da177e4 LT |
1449 | break; |
1450 | } | |
1451 | ||
1452 | if (do_tx_balance) { | |
1453 | hash_index = _simple_hash(hash_start, hash_size); | |
1454 | tx_slave = tlb_choose_channel(bond, hash_index, skb->len); | |
1455 | } | |
1456 | ||
9a49aba1 | 1457 | return bond_do_alb_xmit(skb, bond, tx_slave); |
1da177e4 LT |
1458 | } |
1459 | ||
1b76b316 | 1460 | void bond_alb_monitor(struct work_struct *work) |
1da177e4 | 1461 | { |
1b76b316 JV |
1462 | struct bonding *bond = container_of(work, struct bonding, |
1463 | alb_work.work); | |
1da177e4 | 1464 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
9caff1e7 | 1465 | struct list_head *iter; |
1da177e4 | 1466 | struct slave *slave; |
1da177e4 | 1467 | |
0965a1f3 | 1468 | if (!bond_has_slaves(bond)) { |
1da177e4 LT |
1469 | bond_info->tx_rebalance_counter = 0; |
1470 | bond_info->lp_counter = 0; | |
1471 | goto re_arm; | |
1472 | } | |
1473 | ||
733ab639 | 1474 | rcu_read_lock(); |
1475 | ||
1da177e4 LT |
1476 | bond_info->tx_rebalance_counter++; |
1477 | bond_info->lp_counter++; | |
1478 | ||
1479 | /* send learning packets */ | |
7eacd038 | 1480 | if (bond_info->lp_counter >= BOND_ALB_LP_TICKS(bond)) { |
d0c21d43 VY |
1481 | bool strict_match; |
1482 | ||
d0c21d43 VY |
1483 | bond_for_each_slave_rcu(bond, slave, iter) { |
1484 | /* If updating current_active, use all currently | |
1485 | * user mac addreses (!strict_match). Otherwise, only | |
1486 | * use mac of the slave device. | |
14af9963 | 1487 | * In RLB mode, we always use strict matches. |
d0c21d43 | 1488 | */ |
4740d638 | 1489 | strict_match = (slave != rcu_access_pointer(bond->curr_active_slave) || |
14af9963 | 1490 | bond_info->rlb_enabled); |
d0c21d43 VY |
1491 | alb_send_learning_packets(slave, slave->dev->dev_addr, |
1492 | strict_match); | |
1493 | } | |
1da177e4 LT |
1494 | bond_info->lp_counter = 0; |
1495 | } | |
1496 | ||
1497 | /* rebalance tx traffic */ | |
1498 | if (bond_info->tx_rebalance_counter >= BOND_TLB_REBALANCE_TICKS) { | |
733ab639 | 1499 | bond_for_each_slave_rcu(bond, slave, iter) { |
1da177e4 | 1500 | tlb_clear_slave(bond, slave, 1); |
4740d638 | 1501 | if (slave == rcu_access_pointer(bond->curr_active_slave)) { |
1da177e4 LT |
1502 | SLAVE_TLB_INFO(slave).load = |
1503 | bond_info->unbalanced_load / | |
1504 | BOND_TLB_REBALANCE_INTERVAL; | |
1505 | bond_info->unbalanced_load = 0; | |
1506 | } | |
1507 | } | |
1da177e4 LT |
1508 | bond_info->tx_rebalance_counter = 0; |
1509 | } | |
1510 | ||
1da177e4 | 1511 | if (bond_info->rlb_enabled) { |
1da177e4 LT |
1512 | if (bond_info->primary_is_promisc && |
1513 | (++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) { | |
1514 | ||
547942ca | 1515 | /* dev_set_promiscuity requires rtnl and |
1f2cd845 DM |
1516 | * nothing else. Avoid race with bond_close. |
1517 | */ | |
733ab639 | 1518 | rcu_read_unlock(); |
1519 | if (!rtnl_trylock()) | |
1f2cd845 | 1520 | goto re_arm; |
1f2cd845 | 1521 | |
1da177e4 LT |
1522 | bond_info->rlb_promisc_timeout_counter = 0; |
1523 | ||
1524 | /* If the primary was set to promiscuous mode | |
1525 | * because a slave was disabled then | |
1526 | * it can now leave promiscuous mode. | |
1527 | */ | |
4740d638 ED |
1528 | dev_set_promiscuity(rtnl_dereference(bond->curr_active_slave)->dev, |
1529 | -1); | |
1da177e4 | 1530 | bond_info->primary_is_promisc = 0; |
1f2cd845 DM |
1531 | |
1532 | rtnl_unlock(); | |
733ab639 | 1533 | rcu_read_lock(); |
d0e81b7e | 1534 | } |
1da177e4 LT |
1535 | |
1536 | if (bond_info->rlb_rebalance) { | |
1537 | bond_info->rlb_rebalance = 0; | |
1538 | rlb_rebalance(bond); | |
1539 | } | |
1540 | ||
1541 | /* check if clients need updating */ | |
1542 | if (bond_info->rx_ntt) { | |
1543 | if (bond_info->rlb_update_delay_counter) { | |
1544 | --bond_info->rlb_update_delay_counter; | |
1545 | } else { | |
1546 | rlb_update_rx_clients(bond); | |
dda0fd5c | 1547 | if (bond_info->rlb_update_retry_counter) |
1da177e4 | 1548 | --bond_info->rlb_update_retry_counter; |
dda0fd5c | 1549 | else |
1da177e4 | 1550 | bond_info->rx_ntt = 0; |
1da177e4 LT |
1551 | } |
1552 | } | |
1553 | } | |
733ab639 | 1554 | rcu_read_unlock(); |
1da177e4 | 1555 | re_arm: |
e6d265e8 | 1556 | queue_delayed_work(bond->wq, &bond->alb_work, alb_delta_in_ticks); |
1da177e4 LT |
1557 | } |
1558 | ||
1559 | /* assumption: called before the slave is attached to the bond | |
1560 | * and not locked by the bond lock | |
1561 | */ | |
1562 | int bond_alb_init_slave(struct bonding *bond, struct slave *slave) | |
1563 | { | |
1564 | int res; | |
1565 | ||
b924551b | 1566 | res = alb_set_slave_mac_addr(slave, slave->perm_hwaddr); |
dda0fd5c | 1567 | if (res) |
1da177e4 | 1568 | return res; |
1da177e4 | 1569 | |
1da177e4 | 1570 | res = alb_handle_addr_collision_on_attach(bond, slave); |
dda0fd5c | 1571 | if (res) |
1da177e4 | 1572 | return res; |
1da177e4 LT |
1573 | |
1574 | tlb_init_slave(slave); | |
1575 | ||
1576 | /* order a rebalance ASAP */ | |
1577 | bond->alb_info.tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS; | |
1578 | ||
dda0fd5c | 1579 | if (bond->alb_info.rlb_enabled) |
1da177e4 | 1580 | bond->alb_info.rlb_rebalance = 1; |
1da177e4 LT |
1581 | |
1582 | return 0; | |
1583 | } | |
1584 | ||
547942ca | 1585 | /* Remove slave from tlb and rlb hash tables, and fix up MAC addresses |
2543331d JV |
1586 | * if necessary. |
1587 | * | |
1588 | * Caller must hold RTNL and no other locks | |
1589 | */ | |
1da177e4 LT |
1590 | void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave) |
1591 | { | |
0965a1f3 | 1592 | if (bond_has_slaves(bond)) |
1da177e4 | 1593 | alb_change_hw_addr_on_detach(bond, slave); |
1da177e4 LT |
1594 | |
1595 | tlb_clear_slave(bond, slave, 0); | |
1596 | ||
1597 | if (bond->alb_info.rlb_enabled) { | |
6475ae4c | 1598 | bond->alb_info.rx_slave = NULL; |
1da177e4 LT |
1599 | rlb_clear_slave(bond, slave); |
1600 | } | |
6b794c1c | 1601 | |
1da177e4 LT |
1602 | } |
1603 | ||
1da177e4 LT |
1604 | void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link) |
1605 | { | |
1606 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1607 | ||
1608 | if (link == BOND_LINK_DOWN) { | |
1609 | tlb_clear_slave(bond, slave, 0); | |
73ac0cd4 | 1610 | if (bond->alb_info.rlb_enabled) |
1da177e4 | 1611 | rlb_clear_slave(bond, slave); |
1da177e4 LT |
1612 | } else if (link == BOND_LINK_UP) { |
1613 | /* order a rebalance ASAP */ | |
1614 | bond_info->tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS; | |
1615 | if (bond->alb_info.rlb_enabled) { | |
1616 | bond->alb_info.rlb_rebalance = 1; | |
1617 | /* If the updelay module parameter is smaller than the | |
1618 | * forwarding delay of the switch the rebalance will | |
1619 | * not work because the rebalance arp replies will | |
1620 | * not be forwarded to the clients.. | |
1621 | */ | |
1622 | } | |
1623 | } | |
6b794c1c MB |
1624 | |
1625 | if (bond_is_nondyn_tlb(bond)) { | |
ee637714 | 1626 | if (bond_update_slave_arr(bond, NULL)) |
6b794c1c MB |
1627 | pr_err("Failed to build slave-array for TLB mode.\n"); |
1628 | } | |
1da177e4 LT |
1629 | } |
1630 | ||
1631 | /** | |
1632 | * bond_alb_handle_active_change - assign new curr_active_slave | |
1633 | * @bond: our bonding struct | |
1634 | * @new_slave: new slave to assign | |
1635 | * | |
1636 | * Set the bond->curr_active_slave to @new_slave and handle | |
1637 | * mac address swapping and promiscuity changes as needed. | |
1638 | * | |
62c5f518 | 1639 | * Caller must hold RTNL |
1da177e4 LT |
1640 | */ |
1641 | void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave) | |
1642 | { | |
1643 | struct slave *swap_slave; | |
4740d638 | 1644 | struct slave *curr_active; |
1da177e4 | 1645 | |
62c5f518 | 1646 | curr_active = rtnl_dereference(bond->curr_active_slave); |
4740d638 | 1647 | if (curr_active == new_slave) |
1da177e4 | 1648 | return; |
1da177e4 | 1649 | |
4740d638 ED |
1650 | if (curr_active && bond->alb_info.primary_is_promisc) { |
1651 | dev_set_promiscuity(curr_active->dev, -1); | |
1da177e4 LT |
1652 | bond->alb_info.primary_is_promisc = 0; |
1653 | bond->alb_info.rlb_promisc_timeout_counter = 0; | |
1654 | } | |
1655 | ||
4740d638 | 1656 | swap_slave = curr_active; |
278b2083 | 1657 | rcu_assign_pointer(bond->curr_active_slave, new_slave); |
1da177e4 | 1658 | |
0965a1f3 | 1659 | if (!new_slave || !bond_has_slaves(bond)) |
1da177e4 | 1660 | return; |
1da177e4 LT |
1661 | |
1662 | /* set the new curr_active_slave to the bonds mac address | |
1663 | * i.e. swap mac addresses of old curr_active_slave and new curr_active_slave | |
1664 | */ | |
b88ec38d VF |
1665 | if (!swap_slave) |
1666 | swap_slave = bond_slave_has_mac(bond, bond->dev->dev_addr); | |
1da177e4 | 1667 | |
547942ca | 1668 | /* Arrange for swap_slave and new_slave to temporarily be |
059fe7a5 JV |
1669 | * ignored so we can mess with their MAC addresses without |
1670 | * fear of interference from transmit activity. | |
1671 | */ | |
dec1e90e | 1672 | if (swap_slave) |
059fe7a5 | 1673 | tlb_clear_slave(bond, swap_slave, 1); |
059fe7a5 JV |
1674 | tlb_clear_slave(bond, new_slave, 1); |
1675 | ||
4996b909 VF |
1676 | /* in TLB mode, the slave might flip down/up with the old dev_addr, |
1677 | * and thus filter bond->dev_addr's packets, so force bond's mac | |
1678 | */ | |
01844098 | 1679 | if (BOND_MODE(bond) == BOND_MODE_TLB) { |
4996b909 VF |
1680 | struct sockaddr sa; |
1681 | u8 tmp_addr[ETH_ALEN]; | |
1682 | ||
ada0f863 | 1683 | ether_addr_copy(tmp_addr, new_slave->dev->dev_addr); |
4996b909 VF |
1684 | |
1685 | memcpy(sa.sa_data, bond->dev->dev_addr, bond->dev->addr_len); | |
1686 | sa.sa_family = bond->dev->type; | |
1687 | /* we don't care if it can't change its mac, best effort */ | |
1688 | dev_set_mac_address(new_slave->dev, &sa); | |
1689 | ||
ada0f863 | 1690 | ether_addr_copy(new_slave->dev->dev_addr, tmp_addr); |
4996b909 VF |
1691 | } |
1692 | ||
1da177e4 LT |
1693 | /* curr_active_slave must be set before calling alb_swap_mac_addr */ |
1694 | if (swap_slave) { | |
1695 | /* swap mac address */ | |
43547ea6 | 1696 | alb_swap_mac_addr(swap_slave, new_slave); |
059fe7a5 JV |
1697 | alb_fasten_mac_swap(bond, swap_slave, new_slave); |
1698 | } else { | |
b88ec38d VF |
1699 | /* set the new_slave to the bond mac address */ |
1700 | alb_set_slave_mac_addr(new_slave, bond->dev->dev_addr); | |
d0c21d43 VY |
1701 | alb_send_learning_packets(new_slave, bond->dev->dev_addr, |
1702 | false); | |
1da177e4 LT |
1703 | } |
1704 | } | |
1705 | ||
ecfede42 | 1706 | /* Called with RTNL */ |
1da177e4 LT |
1707 | int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr) |
1708 | { | |
454d7c9b | 1709 | struct bonding *bond = netdev_priv(bond_dev); |
1da177e4 | 1710 | struct sockaddr *sa = addr; |
4740d638 | 1711 | struct slave *curr_active; |
b88ec38d | 1712 | struct slave *swap_slave; |
1da177e4 | 1713 | int res; |
1da177e4 | 1714 | |
73ac0cd4 | 1715 | if (!is_valid_ether_addr(sa->sa_data)) |
1da177e4 | 1716 | return -EADDRNOTAVAIL; |
1da177e4 LT |
1717 | |
1718 | res = alb_set_mac_address(bond, addr); | |
73ac0cd4 | 1719 | if (res) |
1da177e4 | 1720 | return res; |
1da177e4 LT |
1721 | |
1722 | memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len); | |
1723 | ||
1724 | /* If there is no curr_active_slave there is nothing else to do. | |
1725 | * Otherwise we'll need to pass the new address to it and handle | |
1726 | * duplications. | |
1727 | */ | |
4740d638 ED |
1728 | curr_active = rtnl_dereference(bond->curr_active_slave); |
1729 | if (!curr_active) | |
1da177e4 | 1730 | return 0; |
1da177e4 | 1731 | |
b88ec38d | 1732 | swap_slave = bond_slave_has_mac(bond, bond_dev->dev_addr); |
1da177e4 LT |
1733 | |
1734 | if (swap_slave) { | |
4740d638 ED |
1735 | alb_swap_mac_addr(swap_slave, curr_active); |
1736 | alb_fasten_mac_swap(bond, swap_slave, curr_active); | |
1da177e4 | 1737 | } else { |
4740d638 | 1738 | alb_set_slave_mac_addr(curr_active, bond_dev->dev_addr); |
1da177e4 | 1739 | |
4740d638 | 1740 | alb_send_learning_packets(curr_active, |
d0c21d43 | 1741 | bond_dev->dev_addr, false); |
1da177e4 LT |
1742 | if (bond->alb_info.rlb_enabled) { |
1743 | /* inform clients mac address has changed */ | |
4740d638 | 1744 | rlb_req_update_slave_clients(bond, curr_active); |
1da177e4 LT |
1745 | } |
1746 | } | |
1747 | ||
1748 | return 0; | |
1749 | } | |
1750 | ||
1751 | void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id) | |
1752 | { | |
73ac0cd4 | 1753 | if (bond->alb_info.rlb_enabled) |
1da177e4 | 1754 | rlb_clear_vlan(bond, vlan_id); |
1da177e4 LT |
1755 | } |
1756 |