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1da177e4 LT |
1 | /* |
2 | * Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License as published by the | |
6 | * Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but | |
10 | * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
11 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 | * for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along | |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
17 | * | |
18 | * The full GNU General Public License is included in this distribution in the | |
19 | * file called LICENSE. | |
20 | * | |
1da177e4 LT |
21 | */ |
22 | ||
a4aee5c8 JP |
23 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
24 | ||
1da177e4 LT |
25 | #include <linux/skbuff.h> |
26 | #include <linux/netdevice.h> | |
27 | #include <linux/etherdevice.h> | |
28 | #include <linux/pkt_sched.h> | |
29 | #include <linux/spinlock.h> | |
30 | #include <linux/slab.h> | |
31 | #include <linux/timer.h> | |
32 | #include <linux/ip.h> | |
33 | #include <linux/ipv6.h> | |
34 | #include <linux/if_arp.h> | |
35 | #include <linux/if_ether.h> | |
36 | #include <linux/if_bonding.h> | |
37 | #include <linux/if_vlan.h> | |
38 | #include <linux/in.h> | |
39 | #include <net/ipx.h> | |
40 | #include <net/arp.h> | |
2d1ea19d | 41 | #include <net/ipv6.h> |
1da177e4 LT |
42 | #include <asm/byteorder.h> |
43 | #include "bonding.h" | |
44 | #include "bond_alb.h" | |
45 | ||
46 | ||
47 | #define ALB_TIMER_TICKS_PER_SEC 10 /* should be a divisor of HZ */ | |
48 | #define BOND_TLB_REBALANCE_INTERVAL 10 /* In seconds, periodic re-balancing. | |
49 | * Used for division - never set | |
50 | * to zero !!! | |
51 | */ | |
52 | #define BOND_ALB_LP_INTERVAL 1 /* In seconds, periodic send of | |
53 | * learning packets to the switch | |
54 | */ | |
55 | ||
56 | #define BOND_TLB_REBALANCE_TICKS (BOND_TLB_REBALANCE_INTERVAL \ | |
57 | * ALB_TIMER_TICKS_PER_SEC) | |
58 | ||
59 | #define BOND_ALB_LP_TICKS (BOND_ALB_LP_INTERVAL \ | |
60 | * ALB_TIMER_TICKS_PER_SEC) | |
61 | ||
62 | #define TLB_HASH_TABLE_SIZE 256 /* The size of the clients hash table. | |
63 | * Note that this value MUST NOT be smaller | |
64 | * because the key hash table is BYTE wide ! | |
65 | */ | |
66 | ||
67 | ||
68 | #define TLB_NULL_INDEX 0xffffffff | |
69 | #define MAX_LP_BURST 3 | |
70 | ||
71 | /* rlb defs */ | |
72 | #define RLB_HASH_TABLE_SIZE 256 | |
73 | #define RLB_NULL_INDEX 0xffffffff | |
74 | #define RLB_UPDATE_DELAY 2*ALB_TIMER_TICKS_PER_SEC /* 2 seconds */ | |
75 | #define RLB_ARP_BURST_SIZE 2 | |
76 | #define RLB_UPDATE_RETRY 3 /* 3-ticks - must be smaller than the rlb | |
77 | * rebalance interval (5 min). | |
78 | */ | |
79 | /* RLB_PROMISC_TIMEOUT = 10 sec equals the time that the current slave is | |
80 | * promiscuous after failover | |
81 | */ | |
82 | #define RLB_PROMISC_TIMEOUT 10*ALB_TIMER_TICKS_PER_SEC | |
83 | ||
885a136c ED |
84 | #ifndef __long_aligned |
85 | #define __long_aligned __attribute__((aligned((sizeof(long))))) | |
86 | #endif | |
87 | static const u8 mac_bcast[ETH_ALEN] __long_aligned = { | |
88 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff | |
89 | }; | |
90 | static const u8 mac_v6_allmcast[ETH_ALEN] __long_aligned = { | |
91 | 0x33, 0x33, 0x00, 0x00, 0x00, 0x01 | |
92 | }; | |
1da177e4 LT |
93 | static const int alb_delta_in_ticks = HZ / ALB_TIMER_TICKS_PER_SEC; |
94 | ||
95 | #pragma pack(1) | |
96 | struct learning_pkt { | |
97 | u8 mac_dst[ETH_ALEN]; | |
98 | u8 mac_src[ETH_ALEN]; | |
d3bb52b0 | 99 | __be16 type; |
1da177e4 LT |
100 | u8 padding[ETH_ZLEN - ETH_HLEN]; |
101 | }; | |
102 | ||
103 | struct arp_pkt { | |
d3bb52b0 AV |
104 | __be16 hw_addr_space; |
105 | __be16 prot_addr_space; | |
1da177e4 LT |
106 | u8 hw_addr_len; |
107 | u8 prot_addr_len; | |
d3bb52b0 | 108 | __be16 op_code; |
1da177e4 | 109 | u8 mac_src[ETH_ALEN]; /* sender hardware address */ |
d3bb52b0 | 110 | __be32 ip_src; /* sender IP address */ |
1da177e4 | 111 | u8 mac_dst[ETH_ALEN]; /* target hardware address */ |
d3bb52b0 | 112 | __be32 ip_dst; /* target IP address */ |
1da177e4 LT |
113 | }; |
114 | #pragma pack() | |
115 | ||
a16aeb36 ACM |
116 | static inline struct arp_pkt *arp_pkt(const struct sk_buff *skb) |
117 | { | |
d56f90a7 | 118 | return (struct arp_pkt *)skb_network_header(skb); |
a16aeb36 ACM |
119 | } |
120 | ||
1da177e4 LT |
121 | /* Forward declaration */ |
122 | static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[]); | |
123 | ||
eddc9ec5 | 124 | static inline u8 _simple_hash(const u8 *hash_start, int hash_size) |
1da177e4 LT |
125 | { |
126 | int i; | |
127 | u8 hash = 0; | |
128 | ||
129 | for (i = 0; i < hash_size; i++) { | |
130 | hash ^= hash_start[i]; | |
131 | } | |
132 | ||
133 | return hash; | |
134 | } | |
135 | ||
136 | /*********************** tlb specific functions ***************************/ | |
137 | ||
138 | static inline void _lock_tx_hashtbl(struct bonding *bond) | |
139 | { | |
6603a6f2 | 140 | spin_lock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock)); |
1da177e4 LT |
141 | } |
142 | ||
143 | static inline void _unlock_tx_hashtbl(struct bonding *bond) | |
144 | { | |
6603a6f2 | 145 | spin_unlock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock)); |
1da177e4 LT |
146 | } |
147 | ||
148 | /* Caller must hold tx_hashtbl lock */ | |
149 | static inline void tlb_init_table_entry(struct tlb_client_info *entry, int save_load) | |
150 | { | |
151 | if (save_load) { | |
152 | entry->load_history = 1 + entry->tx_bytes / | |
153 | BOND_TLB_REBALANCE_INTERVAL; | |
154 | entry->tx_bytes = 0; | |
155 | } | |
156 | ||
157 | entry->tx_slave = NULL; | |
158 | entry->next = TLB_NULL_INDEX; | |
159 | entry->prev = TLB_NULL_INDEX; | |
160 | } | |
161 | ||
162 | static inline void tlb_init_slave(struct slave *slave) | |
163 | { | |
164 | SLAVE_TLB_INFO(slave).load = 0; | |
165 | SLAVE_TLB_INFO(slave).head = TLB_NULL_INDEX; | |
166 | } | |
167 | ||
168 | /* Caller must hold bond lock for read */ | |
169 | static void tlb_clear_slave(struct bonding *bond, struct slave *slave, int save_load) | |
170 | { | |
171 | struct tlb_client_info *tx_hash_table; | |
172 | u32 index; | |
173 | ||
174 | _lock_tx_hashtbl(bond); | |
175 | ||
176 | /* clear slave from tx_hashtbl */ | |
177 | tx_hash_table = BOND_ALB_INFO(bond).tx_hashtbl; | |
178 | ||
ce39a800 AG |
179 | /* skip this if we've already freed the tx hash table */ |
180 | if (tx_hash_table) { | |
181 | index = SLAVE_TLB_INFO(slave).head; | |
182 | while (index != TLB_NULL_INDEX) { | |
183 | u32 next_index = tx_hash_table[index].next; | |
184 | tlb_init_table_entry(&tx_hash_table[index], save_load); | |
185 | index = next_index; | |
186 | } | |
1da177e4 LT |
187 | } |
188 | ||
1da177e4 | 189 | tlb_init_slave(slave); |
5af47b2f JV |
190 | |
191 | _unlock_tx_hashtbl(bond); | |
1da177e4 LT |
192 | } |
193 | ||
194 | /* Must be called before starting the monitor timer */ | |
195 | static int tlb_initialize(struct bonding *bond) | |
196 | { | |
197 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
198 | int size = TLB_HASH_TABLE_SIZE * sizeof(struct tlb_client_info); | |
0d206a3a | 199 | struct tlb_client_info *new_hashtbl; |
1da177e4 LT |
200 | int i; |
201 | ||
202 | spin_lock_init(&(bond_info->tx_hashtbl_lock)); | |
203 | ||
243cb4e5 | 204 | new_hashtbl = kzalloc(size, GFP_KERNEL); |
0d206a3a | 205 | if (!new_hashtbl) { |
a4aee5c8 | 206 | pr_err("%s: Error: Failed to allocate TLB hash table\n", |
1da177e4 | 207 | bond->dev->name); |
1da177e4 LT |
208 | return -1; |
209 | } | |
0d206a3a MW |
210 | _lock_tx_hashtbl(bond); |
211 | ||
212 | bond_info->tx_hashtbl = new_hashtbl; | |
1da177e4 | 213 | |
1da177e4 LT |
214 | for (i = 0; i < TLB_HASH_TABLE_SIZE; i++) { |
215 | tlb_init_table_entry(&bond_info->tx_hashtbl[i], 1); | |
216 | } | |
217 | ||
218 | _unlock_tx_hashtbl(bond); | |
219 | ||
220 | return 0; | |
221 | } | |
222 | ||
223 | /* Must be called only after all slaves have been released */ | |
224 | static void tlb_deinitialize(struct bonding *bond) | |
225 | { | |
226 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
227 | ||
228 | _lock_tx_hashtbl(bond); | |
229 | ||
230 | kfree(bond_info->tx_hashtbl); | |
231 | bond_info->tx_hashtbl = NULL; | |
232 | ||
233 | _unlock_tx_hashtbl(bond); | |
234 | } | |
235 | ||
236 | /* Caller must hold bond lock for read */ | |
237 | static struct slave *tlb_get_least_loaded_slave(struct bonding *bond) | |
238 | { | |
239 | struct slave *slave, *least_loaded; | |
240 | s64 max_gap; | |
241 | int i, found = 0; | |
242 | ||
243 | /* Find the first enabled slave */ | |
244 | bond_for_each_slave(bond, slave, i) { | |
245 | if (SLAVE_IS_OK(slave)) { | |
246 | found = 1; | |
247 | break; | |
248 | } | |
249 | } | |
250 | ||
251 | if (!found) { | |
252 | return NULL; | |
253 | } | |
254 | ||
255 | least_loaded = slave; | |
256 | max_gap = (s64)(slave->speed << 20) - /* Convert to Megabit per sec */ | |
257 | (s64)(SLAVE_TLB_INFO(slave).load << 3); /* Bytes to bits */ | |
258 | ||
259 | /* Find the slave with the largest gap */ | |
260 | bond_for_each_slave_from(bond, slave, i, least_loaded) { | |
261 | if (SLAVE_IS_OK(slave)) { | |
262 | s64 gap = (s64)(slave->speed << 20) - | |
263 | (s64)(SLAVE_TLB_INFO(slave).load << 3); | |
264 | if (max_gap < gap) { | |
265 | least_loaded = slave; | |
266 | max_gap = gap; | |
267 | } | |
268 | } | |
269 | } | |
270 | ||
271 | return least_loaded; | |
272 | } | |
273 | ||
274 | /* Caller must hold bond lock for read */ | |
275 | static struct slave *tlb_choose_channel(struct bonding *bond, u32 hash_index, u32 skb_len) | |
276 | { | |
277 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
278 | struct tlb_client_info *hash_table; | |
279 | struct slave *assigned_slave; | |
280 | ||
281 | _lock_tx_hashtbl(bond); | |
282 | ||
283 | hash_table = bond_info->tx_hashtbl; | |
284 | assigned_slave = hash_table[hash_index].tx_slave; | |
285 | if (!assigned_slave) { | |
286 | assigned_slave = tlb_get_least_loaded_slave(bond); | |
287 | ||
288 | if (assigned_slave) { | |
289 | struct tlb_slave_info *slave_info = | |
290 | &(SLAVE_TLB_INFO(assigned_slave)); | |
291 | u32 next_index = slave_info->head; | |
292 | ||
293 | hash_table[hash_index].tx_slave = assigned_slave; | |
294 | hash_table[hash_index].next = next_index; | |
295 | hash_table[hash_index].prev = TLB_NULL_INDEX; | |
296 | ||
297 | if (next_index != TLB_NULL_INDEX) { | |
298 | hash_table[next_index].prev = hash_index; | |
299 | } | |
300 | ||
301 | slave_info->head = hash_index; | |
302 | slave_info->load += | |
303 | hash_table[hash_index].load_history; | |
304 | } | |
305 | } | |
306 | ||
307 | if (assigned_slave) { | |
308 | hash_table[hash_index].tx_bytes += skb_len; | |
309 | } | |
310 | ||
311 | _unlock_tx_hashtbl(bond); | |
312 | ||
313 | return assigned_slave; | |
314 | } | |
315 | ||
316 | /*********************** rlb specific functions ***************************/ | |
317 | static inline void _lock_rx_hashtbl(struct bonding *bond) | |
318 | { | |
6603a6f2 | 319 | spin_lock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock)); |
1da177e4 LT |
320 | } |
321 | ||
322 | static inline void _unlock_rx_hashtbl(struct bonding *bond) | |
323 | { | |
6603a6f2 | 324 | spin_unlock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock)); |
1da177e4 LT |
325 | } |
326 | ||
327 | /* when an ARP REPLY is received from a client update its info | |
328 | * in the rx_hashtbl | |
329 | */ | |
330 | static void rlb_update_entry_from_arp(struct bonding *bond, struct arp_pkt *arp) | |
331 | { | |
332 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
333 | struct rlb_client_info *client_info; | |
334 | u32 hash_index; | |
335 | ||
336 | _lock_rx_hashtbl(bond); | |
337 | ||
338 | hash_index = _simple_hash((u8*)&(arp->ip_src), sizeof(arp->ip_src)); | |
339 | client_info = &(bond_info->rx_hashtbl[hash_index]); | |
340 | ||
341 | if ((client_info->assigned) && | |
342 | (client_info->ip_src == arp->ip_dst) && | |
343 | (client_info->ip_dst == arp->ip_src)) { | |
344 | /* update the clients MAC address */ | |
345 | memcpy(client_info->mac_dst, arp->mac_src, ETH_ALEN); | |
346 | client_info->ntt = 1; | |
347 | bond_info->rx_ntt = 1; | |
348 | } | |
349 | ||
350 | _unlock_rx_hashtbl(bond); | |
351 | } | |
352 | ||
f2ccd8fa | 353 | static int rlb_arp_recv(struct sk_buff *skb, struct net_device *bond_dev, struct packet_type *ptype, struct net_device *orig_dev) |
1da177e4 | 354 | { |
6146b1a4 | 355 | struct bonding *bond; |
1da177e4 LT |
356 | struct arp_pkt *arp = (struct arp_pkt *)skb->data; |
357 | int res = NET_RX_DROP; | |
358 | ||
6146b1a4 JV |
359 | while (bond_dev->priv_flags & IFF_802_1Q_VLAN) |
360 | bond_dev = vlan_dev_real_dev(bond_dev); | |
361 | ||
362 | if (!(bond_dev->priv_flags & IFF_BONDING) || | |
363 | !(bond_dev->flags & IFF_MASTER)) | |
1da177e4 | 364 | goto out; |
1da177e4 LT |
365 | |
366 | if (!arp) { | |
5a03cdb7 | 367 | pr_debug("Packet has no ARP data\n"); |
1da177e4 LT |
368 | goto out; |
369 | } | |
370 | ||
371 | if (skb->len < sizeof(struct arp_pkt)) { | |
5a03cdb7 | 372 | pr_debug("Packet is too small to be an ARP\n"); |
1da177e4 LT |
373 | goto out; |
374 | } | |
375 | ||
376 | if (arp->op_code == htons(ARPOP_REPLY)) { | |
377 | /* update rx hash table for this ARP */ | |
454d7c9b | 378 | bond = netdev_priv(bond_dev); |
1da177e4 | 379 | rlb_update_entry_from_arp(bond, arp); |
5a03cdb7 | 380 | pr_debug("Server received an ARP Reply from client\n"); |
1da177e4 LT |
381 | } |
382 | ||
383 | res = NET_RX_SUCCESS; | |
384 | ||
385 | out: | |
386 | dev_kfree_skb(skb); | |
387 | ||
388 | return res; | |
389 | } | |
390 | ||
391 | /* Caller must hold bond lock for read */ | |
392 | static struct slave *rlb_next_rx_slave(struct bonding *bond) | |
393 | { | |
394 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
395 | struct slave *rx_slave, *slave, *start_at; | |
396 | int i = 0; | |
397 | ||
398 | if (bond_info->next_rx_slave) { | |
399 | start_at = bond_info->next_rx_slave; | |
400 | } else { | |
401 | start_at = bond->first_slave; | |
402 | } | |
403 | ||
404 | rx_slave = NULL; | |
405 | ||
406 | bond_for_each_slave_from(bond, slave, i, start_at) { | |
407 | if (SLAVE_IS_OK(slave)) { | |
408 | if (!rx_slave) { | |
409 | rx_slave = slave; | |
410 | } else if (slave->speed > rx_slave->speed) { | |
411 | rx_slave = slave; | |
412 | } | |
413 | } | |
414 | } | |
415 | ||
416 | if (rx_slave) { | |
417 | bond_info->next_rx_slave = rx_slave->next; | |
418 | } | |
419 | ||
420 | return rx_slave; | |
421 | } | |
422 | ||
423 | /* teach the switch the mac of a disabled slave | |
424 | * on the primary for fault tolerance | |
425 | * | |
426 | * Caller must hold bond->curr_slave_lock for write or bond lock for write | |
427 | */ | |
428 | static void rlb_teach_disabled_mac_on_primary(struct bonding *bond, u8 addr[]) | |
429 | { | |
430 | if (!bond->curr_active_slave) { | |
431 | return; | |
432 | } | |
433 | ||
434 | if (!bond->alb_info.primary_is_promisc) { | |
7e1a1ac1 WC |
435 | if (!dev_set_promiscuity(bond->curr_active_slave->dev, 1)) |
436 | bond->alb_info.primary_is_promisc = 1; | |
437 | else | |
438 | bond->alb_info.primary_is_promisc = 0; | |
1da177e4 LT |
439 | } |
440 | ||
441 | bond->alb_info.rlb_promisc_timeout_counter = 0; | |
442 | ||
443 | alb_send_learning_packets(bond->curr_active_slave, addr); | |
444 | } | |
445 | ||
446 | /* slave being removed should not be active at this point | |
447 | * | |
448 | * Caller must hold bond lock for read | |
449 | */ | |
450 | static void rlb_clear_slave(struct bonding *bond, struct slave *slave) | |
451 | { | |
452 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
453 | struct rlb_client_info *rx_hash_table; | |
454 | u32 index, next_index; | |
455 | ||
456 | /* clear slave from rx_hashtbl */ | |
457 | _lock_rx_hashtbl(bond); | |
458 | ||
459 | rx_hash_table = bond_info->rx_hashtbl; | |
460 | index = bond_info->rx_hashtbl_head; | |
461 | for (; index != RLB_NULL_INDEX; index = next_index) { | |
462 | next_index = rx_hash_table[index].next; | |
463 | if (rx_hash_table[index].slave == slave) { | |
464 | struct slave *assigned_slave = rlb_next_rx_slave(bond); | |
465 | ||
466 | if (assigned_slave) { | |
467 | rx_hash_table[index].slave = assigned_slave; | |
885a136c ED |
468 | if (compare_ether_addr_64bits(rx_hash_table[index].mac_dst, |
469 | mac_bcast)) { | |
1da177e4 LT |
470 | bond_info->rx_hashtbl[index].ntt = 1; |
471 | bond_info->rx_ntt = 1; | |
472 | /* A slave has been removed from the | |
473 | * table because it is either disabled | |
474 | * or being released. We must retry the | |
475 | * update to avoid clients from not | |
476 | * being updated & disconnecting when | |
477 | * there is stress | |
478 | */ | |
479 | bond_info->rlb_update_retry_counter = | |
480 | RLB_UPDATE_RETRY; | |
481 | } | |
482 | } else { /* there is no active slave */ | |
483 | rx_hash_table[index].slave = NULL; | |
484 | } | |
485 | } | |
486 | } | |
487 | ||
488 | _unlock_rx_hashtbl(bond); | |
489 | ||
6603a6f2 | 490 | write_lock_bh(&bond->curr_slave_lock); |
1da177e4 LT |
491 | |
492 | if (slave != bond->curr_active_slave) { | |
493 | rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr); | |
494 | } | |
495 | ||
6603a6f2 | 496 | write_unlock_bh(&bond->curr_slave_lock); |
1da177e4 LT |
497 | } |
498 | ||
499 | static void rlb_update_client(struct rlb_client_info *client_info) | |
500 | { | |
501 | int i; | |
502 | ||
503 | if (!client_info->slave) { | |
504 | return; | |
505 | } | |
506 | ||
507 | for (i = 0; i < RLB_ARP_BURST_SIZE; i++) { | |
508 | struct sk_buff *skb; | |
509 | ||
510 | skb = arp_create(ARPOP_REPLY, ETH_P_ARP, | |
511 | client_info->ip_dst, | |
512 | client_info->slave->dev, | |
513 | client_info->ip_src, | |
514 | client_info->mac_dst, | |
515 | client_info->slave->dev->dev_addr, | |
516 | client_info->mac_dst); | |
517 | if (!skb) { | |
a4aee5c8 | 518 | pr_err("%s: Error: failed to create an ARP packet\n", |
4e0952c7 | 519 | client_info->slave->dev->master->name); |
1da177e4 LT |
520 | continue; |
521 | } | |
522 | ||
523 | skb->dev = client_info->slave->dev; | |
524 | ||
525 | if (client_info->tag) { | |
526 | skb = vlan_put_tag(skb, client_info->vlan_id); | |
527 | if (!skb) { | |
a4aee5c8 | 528 | pr_err("%s: Error: failed to insert VLAN tag\n", |
4e0952c7 | 529 | client_info->slave->dev->master->name); |
1da177e4 LT |
530 | continue; |
531 | } | |
532 | } | |
533 | ||
534 | arp_xmit(skb); | |
535 | } | |
536 | } | |
537 | ||
538 | /* sends ARP REPLIES that update the clients that need updating */ | |
539 | static void rlb_update_rx_clients(struct bonding *bond) | |
540 | { | |
541 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
542 | struct rlb_client_info *client_info; | |
543 | u32 hash_index; | |
544 | ||
545 | _lock_rx_hashtbl(bond); | |
546 | ||
547 | hash_index = bond_info->rx_hashtbl_head; | |
548 | for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) { | |
549 | client_info = &(bond_info->rx_hashtbl[hash_index]); | |
550 | if (client_info->ntt) { | |
551 | rlb_update_client(client_info); | |
552 | if (bond_info->rlb_update_retry_counter == 0) { | |
553 | client_info->ntt = 0; | |
554 | } | |
555 | } | |
556 | } | |
557 | ||
94e2bd68 | 558 | /* do not update the entries again until this counter is zero so that |
1da177e4 LT |
559 | * not to confuse the clients. |
560 | */ | |
561 | bond_info->rlb_update_delay_counter = RLB_UPDATE_DELAY; | |
562 | ||
563 | _unlock_rx_hashtbl(bond); | |
564 | } | |
565 | ||
566 | /* The slave was assigned a new mac address - update the clients */ | |
567 | static void rlb_req_update_slave_clients(struct bonding *bond, struct slave *slave) | |
568 | { | |
569 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
570 | struct rlb_client_info *client_info; | |
571 | int ntt = 0; | |
572 | u32 hash_index; | |
573 | ||
574 | _lock_rx_hashtbl(bond); | |
575 | ||
576 | hash_index = bond_info->rx_hashtbl_head; | |
577 | for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) { | |
578 | client_info = &(bond_info->rx_hashtbl[hash_index]); | |
579 | ||
580 | if ((client_info->slave == slave) && | |
885a136c | 581 | compare_ether_addr_64bits(client_info->mac_dst, mac_bcast)) { |
1da177e4 LT |
582 | client_info->ntt = 1; |
583 | ntt = 1; | |
584 | } | |
585 | } | |
586 | ||
587 | // update the team's flag only after the whole iteration | |
588 | if (ntt) { | |
589 | bond_info->rx_ntt = 1; | |
590 | //fasten the change | |
591 | bond_info->rlb_update_retry_counter = RLB_UPDATE_RETRY; | |
592 | } | |
593 | ||
594 | _unlock_rx_hashtbl(bond); | |
595 | } | |
596 | ||
597 | /* mark all clients using src_ip to be updated */ | |
d3bb52b0 | 598 | static void rlb_req_update_subnet_clients(struct bonding *bond, __be32 src_ip) |
1da177e4 LT |
599 | { |
600 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
601 | struct rlb_client_info *client_info; | |
602 | u32 hash_index; | |
603 | ||
604 | _lock_rx_hashtbl(bond); | |
605 | ||
606 | hash_index = bond_info->rx_hashtbl_head; | |
607 | for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) { | |
608 | client_info = &(bond_info->rx_hashtbl[hash_index]); | |
609 | ||
610 | if (!client_info->slave) { | |
a4aee5c8 | 611 | pr_err("%s: Error: found a client with no channel in the client's hash table\n", |
4e0952c7 | 612 | bond->dev->name); |
1da177e4 LT |
613 | continue; |
614 | } | |
615 | /*update all clients using this src_ip, that are not assigned | |
616 | * to the team's address (curr_active_slave) and have a known | |
617 | * unicast mac address. | |
618 | */ | |
619 | if ((client_info->ip_src == src_ip) && | |
885a136c ED |
620 | compare_ether_addr_64bits(client_info->slave->dev->dev_addr, |
621 | bond->dev->dev_addr) && | |
622 | compare_ether_addr_64bits(client_info->mac_dst, mac_bcast)) { | |
1da177e4 LT |
623 | client_info->ntt = 1; |
624 | bond_info->rx_ntt = 1; | |
625 | } | |
626 | } | |
627 | ||
628 | _unlock_rx_hashtbl(bond); | |
629 | } | |
630 | ||
631 | /* Caller must hold both bond and ptr locks for read */ | |
632 | static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bond) | |
633 | { | |
634 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
a16aeb36 | 635 | struct arp_pkt *arp = arp_pkt(skb); |
1da177e4 LT |
636 | struct slave *assigned_slave; |
637 | struct rlb_client_info *client_info; | |
638 | u32 hash_index = 0; | |
639 | ||
640 | _lock_rx_hashtbl(bond); | |
641 | ||
642 | hash_index = _simple_hash((u8 *)&arp->ip_dst, sizeof(arp->ip_src)); | |
643 | client_info = &(bond_info->rx_hashtbl[hash_index]); | |
644 | ||
645 | if (client_info->assigned) { | |
646 | if ((client_info->ip_src == arp->ip_src) && | |
647 | (client_info->ip_dst == arp->ip_dst)) { | |
648 | /* the entry is already assigned to this client */ | |
885a136c | 649 | if (compare_ether_addr_64bits(arp->mac_dst, mac_bcast)) { |
1da177e4 LT |
650 | /* update mac address from arp */ |
651 | memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN); | |
652 | } | |
653 | ||
654 | assigned_slave = client_info->slave; | |
655 | if (assigned_slave) { | |
656 | _unlock_rx_hashtbl(bond); | |
657 | return assigned_slave; | |
658 | } | |
659 | } else { | |
660 | /* the entry is already assigned to some other client, | |
661 | * move the old client to primary (curr_active_slave) so | |
662 | * that the new client can be assigned to this entry. | |
663 | */ | |
664 | if (bond->curr_active_slave && | |
665 | client_info->slave != bond->curr_active_slave) { | |
666 | client_info->slave = bond->curr_active_slave; | |
667 | rlb_update_client(client_info); | |
668 | } | |
669 | } | |
670 | } | |
671 | /* assign a new slave */ | |
672 | assigned_slave = rlb_next_rx_slave(bond); | |
673 | ||
674 | if (assigned_slave) { | |
675 | client_info->ip_src = arp->ip_src; | |
676 | client_info->ip_dst = arp->ip_dst; | |
677 | /* arp->mac_dst is broadcast for arp reqeusts. | |
678 | * will be updated with clients actual unicast mac address | |
679 | * upon receiving an arp reply. | |
680 | */ | |
681 | memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN); | |
682 | client_info->slave = assigned_slave; | |
683 | ||
885a136c | 684 | if (compare_ether_addr_64bits(client_info->mac_dst, mac_bcast)) { |
1da177e4 LT |
685 | client_info->ntt = 1; |
686 | bond->alb_info.rx_ntt = 1; | |
687 | } else { | |
688 | client_info->ntt = 0; | |
689 | } | |
690 | ||
691 | if (!list_empty(&bond->vlan_list)) { | |
966bc6f4 | 692 | if (!vlan_get_tag(skb, &client_info->vlan_id)) |
1da177e4 | 693 | client_info->tag = 1; |
1da177e4 LT |
694 | } |
695 | ||
696 | if (!client_info->assigned) { | |
697 | u32 prev_tbl_head = bond_info->rx_hashtbl_head; | |
698 | bond_info->rx_hashtbl_head = hash_index; | |
699 | client_info->next = prev_tbl_head; | |
700 | if (prev_tbl_head != RLB_NULL_INDEX) { | |
701 | bond_info->rx_hashtbl[prev_tbl_head].prev = | |
702 | hash_index; | |
703 | } | |
704 | client_info->assigned = 1; | |
705 | } | |
706 | } | |
707 | ||
708 | _unlock_rx_hashtbl(bond); | |
709 | ||
710 | return assigned_slave; | |
711 | } | |
712 | ||
713 | /* chooses (and returns) transmit channel for arp reply | |
714 | * does not choose channel for other arp types since they are | |
715 | * sent on the curr_active_slave | |
716 | */ | |
717 | static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond) | |
718 | { | |
a16aeb36 | 719 | struct arp_pkt *arp = arp_pkt(skb); |
1da177e4 LT |
720 | struct slave *tx_slave = NULL; |
721 | ||
f14c4e4e | 722 | if (arp->op_code == htons(ARPOP_REPLY)) { |
1da177e4 LT |
723 | /* the arp must be sent on the selected |
724 | * rx channel | |
725 | */ | |
726 | tx_slave = rlb_choose_channel(skb, bond); | |
727 | if (tx_slave) { | |
728 | memcpy(arp->mac_src,tx_slave->dev->dev_addr, ETH_ALEN); | |
729 | } | |
5a03cdb7 | 730 | pr_debug("Server sent ARP Reply packet\n"); |
f14c4e4e | 731 | } else if (arp->op_code == htons(ARPOP_REQUEST)) { |
1da177e4 LT |
732 | /* Create an entry in the rx_hashtbl for this client as a |
733 | * place holder. | |
734 | * When the arp reply is received the entry will be updated | |
735 | * with the correct unicast address of the client. | |
736 | */ | |
737 | rlb_choose_channel(skb, bond); | |
738 | ||
739 | /* The ARP relpy packets must be delayed so that | |
740 | * they can cancel out the influence of the ARP request. | |
741 | */ | |
742 | bond->alb_info.rlb_update_delay_counter = RLB_UPDATE_DELAY; | |
743 | ||
744 | /* arp requests are broadcast and are sent on the primary | |
745 | * the arp request will collapse all clients on the subnet to | |
746 | * the primary slave. We must register these clients to be | |
747 | * updated with their assigned mac. | |
748 | */ | |
749 | rlb_req_update_subnet_clients(bond, arp->ip_src); | |
5a03cdb7 | 750 | pr_debug("Server sent ARP Request packet\n"); |
1da177e4 LT |
751 | } |
752 | ||
753 | return tx_slave; | |
754 | } | |
755 | ||
756 | /* Caller must hold bond lock for read */ | |
757 | static void rlb_rebalance(struct bonding *bond) | |
758 | { | |
759 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
760 | struct slave *assigned_slave; | |
761 | struct rlb_client_info *client_info; | |
762 | int ntt; | |
763 | u32 hash_index; | |
764 | ||
765 | _lock_rx_hashtbl(bond); | |
766 | ||
767 | ntt = 0; | |
768 | hash_index = bond_info->rx_hashtbl_head; | |
769 | for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) { | |
770 | client_info = &(bond_info->rx_hashtbl[hash_index]); | |
771 | assigned_slave = rlb_next_rx_slave(bond); | |
772 | if (assigned_slave && (client_info->slave != assigned_slave)) { | |
773 | client_info->slave = assigned_slave; | |
774 | client_info->ntt = 1; | |
775 | ntt = 1; | |
776 | } | |
777 | } | |
778 | ||
779 | /* update the team's flag only after the whole iteration */ | |
780 | if (ntt) { | |
781 | bond_info->rx_ntt = 1; | |
782 | } | |
783 | _unlock_rx_hashtbl(bond); | |
784 | } | |
785 | ||
786 | /* Caller must hold rx_hashtbl lock */ | |
787 | static void rlb_init_table_entry(struct rlb_client_info *entry) | |
788 | { | |
789 | memset(entry, 0, sizeof(struct rlb_client_info)); | |
790 | entry->next = RLB_NULL_INDEX; | |
791 | entry->prev = RLB_NULL_INDEX; | |
792 | } | |
793 | ||
794 | static int rlb_initialize(struct bonding *bond) | |
795 | { | |
796 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
797 | struct packet_type *pk_type = &(BOND_ALB_INFO(bond).rlb_pkt_type); | |
0d206a3a | 798 | struct rlb_client_info *new_hashtbl; |
1da177e4 LT |
799 | int size = RLB_HASH_TABLE_SIZE * sizeof(struct rlb_client_info); |
800 | int i; | |
801 | ||
802 | spin_lock_init(&(bond_info->rx_hashtbl_lock)); | |
803 | ||
0d206a3a MW |
804 | new_hashtbl = kmalloc(size, GFP_KERNEL); |
805 | if (!new_hashtbl) { | |
a4aee5c8 | 806 | pr_err("%s: Error: Failed to allocate RLB hash table\n", |
1da177e4 | 807 | bond->dev->name); |
1da177e4 LT |
808 | return -1; |
809 | } | |
0d206a3a MW |
810 | _lock_rx_hashtbl(bond); |
811 | ||
812 | bond_info->rx_hashtbl = new_hashtbl; | |
1da177e4 LT |
813 | |
814 | bond_info->rx_hashtbl_head = RLB_NULL_INDEX; | |
815 | ||
816 | for (i = 0; i < RLB_HASH_TABLE_SIZE; i++) { | |
817 | rlb_init_table_entry(bond_info->rx_hashtbl + i); | |
818 | } | |
819 | ||
820 | _unlock_rx_hashtbl(bond); | |
821 | ||
822 | /*initialize packet type*/ | |
09640e63 | 823 | pk_type->type = cpu_to_be16(ETH_P_ARP); |
6146b1a4 | 824 | pk_type->dev = NULL; |
1da177e4 LT |
825 | pk_type->func = rlb_arp_recv; |
826 | ||
827 | /* register to receive ARPs */ | |
828 | dev_add_pack(pk_type); | |
829 | ||
830 | return 0; | |
831 | } | |
832 | ||
833 | static void rlb_deinitialize(struct bonding *bond) | |
834 | { | |
835 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
836 | ||
837 | dev_remove_pack(&(bond_info->rlb_pkt_type)); | |
838 | ||
839 | _lock_rx_hashtbl(bond); | |
840 | ||
841 | kfree(bond_info->rx_hashtbl); | |
842 | bond_info->rx_hashtbl = NULL; | |
843 | bond_info->rx_hashtbl_head = RLB_NULL_INDEX; | |
844 | ||
845 | _unlock_rx_hashtbl(bond); | |
846 | } | |
847 | ||
848 | static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id) | |
849 | { | |
850 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
851 | u32 curr_index; | |
852 | ||
853 | _lock_rx_hashtbl(bond); | |
854 | ||
855 | curr_index = bond_info->rx_hashtbl_head; | |
856 | while (curr_index != RLB_NULL_INDEX) { | |
857 | struct rlb_client_info *curr = &(bond_info->rx_hashtbl[curr_index]); | |
858 | u32 next_index = bond_info->rx_hashtbl[curr_index].next; | |
859 | u32 prev_index = bond_info->rx_hashtbl[curr_index].prev; | |
860 | ||
861 | if (curr->tag && (curr->vlan_id == vlan_id)) { | |
862 | if (curr_index == bond_info->rx_hashtbl_head) { | |
863 | bond_info->rx_hashtbl_head = next_index; | |
864 | } | |
865 | if (prev_index != RLB_NULL_INDEX) { | |
866 | bond_info->rx_hashtbl[prev_index].next = next_index; | |
867 | } | |
868 | if (next_index != RLB_NULL_INDEX) { | |
869 | bond_info->rx_hashtbl[next_index].prev = prev_index; | |
870 | } | |
871 | ||
872 | rlb_init_table_entry(curr); | |
873 | } | |
874 | ||
875 | curr_index = next_index; | |
876 | } | |
877 | ||
878 | _unlock_rx_hashtbl(bond); | |
879 | } | |
880 | ||
881 | /*********************** tlb/rlb shared functions *********************/ | |
882 | ||
883 | static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[]) | |
884 | { | |
885 | struct bonding *bond = bond_get_bond_by_slave(slave); | |
886 | struct learning_pkt pkt; | |
887 | int size = sizeof(struct learning_pkt); | |
888 | int i; | |
889 | ||
890 | memset(&pkt, 0, size); | |
891 | memcpy(pkt.mac_dst, mac_addr, ETH_ALEN); | |
892 | memcpy(pkt.mac_src, mac_addr, ETH_ALEN); | |
09640e63 | 893 | pkt.type = cpu_to_be16(ETH_P_LOOP); |
1da177e4 LT |
894 | |
895 | for (i = 0; i < MAX_LP_BURST; i++) { | |
896 | struct sk_buff *skb; | |
897 | char *data; | |
898 | ||
899 | skb = dev_alloc_skb(size); | |
900 | if (!skb) { | |
901 | return; | |
902 | } | |
903 | ||
904 | data = skb_put(skb, size); | |
905 | memcpy(data, &pkt, size); | |
906 | ||
459a98ed | 907 | skb_reset_mac_header(skb); |
b0e380b1 | 908 | skb->network_header = skb->mac_header + ETH_HLEN; |
1da177e4 LT |
909 | skb->protocol = pkt.type; |
910 | skb->priority = TC_PRIO_CONTROL; | |
911 | skb->dev = slave->dev; | |
912 | ||
913 | if (!list_empty(&bond->vlan_list)) { | |
914 | struct vlan_entry *vlan; | |
915 | ||
916 | vlan = bond_next_vlan(bond, | |
917 | bond->alb_info.current_alb_vlan); | |
918 | ||
919 | bond->alb_info.current_alb_vlan = vlan; | |
920 | if (!vlan) { | |
921 | kfree_skb(skb); | |
922 | continue; | |
923 | } | |
924 | ||
925 | skb = vlan_put_tag(skb, vlan->vlan_id); | |
926 | if (!skb) { | |
a4aee5c8 | 927 | pr_err("%s: Error: failed to insert VLAN tag\n", |
4e0952c7 | 928 | bond->dev->name); |
1da177e4 LT |
929 | continue; |
930 | } | |
931 | } | |
932 | ||
933 | dev_queue_xmit(skb); | |
934 | } | |
935 | } | |
936 | ||
937 | /* hw is a boolean parameter that determines whether we should try and | |
938 | * set the hw address of the device as well as the hw address of the | |
939 | * net_device | |
940 | */ | |
941 | static int alb_set_slave_mac_addr(struct slave *slave, u8 addr[], int hw) | |
942 | { | |
943 | struct net_device *dev = slave->dev; | |
944 | struct sockaddr s_addr; | |
945 | ||
946 | if (!hw) { | |
947 | memcpy(dev->dev_addr, addr, dev->addr_len); | |
948 | return 0; | |
949 | } | |
950 | ||
951 | /* for rlb each slave must have a unique hw mac addresses so that */ | |
952 | /* each slave will receive packets destined to a different mac */ | |
953 | memcpy(s_addr.sa_data, addr, dev->addr_len); | |
954 | s_addr.sa_family = dev->type; | |
955 | if (dev_set_mac_address(dev, &s_addr)) { | |
a4aee5c8 JP |
956 | pr_err("%s: Error: dev_set_mac_address of dev %s failed!\n" |
957 | "ALB mode requires that the base driver support setting the hw address also when the network device's interface is open\n", | |
4e0952c7 | 958 | dev->master->name, dev->name); |
1da177e4 LT |
959 | return -EOPNOTSUPP; |
960 | } | |
961 | return 0; | |
962 | } | |
963 | ||
059fe7a5 JV |
964 | /* |
965 | * Swap MAC addresses between two slaves. | |
966 | * | |
967 | * Called with RTNL held, and no other locks. | |
968 | * | |
969 | */ | |
970 | ||
1da177e4 LT |
971 | static void alb_swap_mac_addr(struct bonding *bond, struct slave *slave1, struct slave *slave2) |
972 | { | |
1da177e4 | 973 | u8 tmp_mac_addr[ETH_ALEN]; |
1da177e4 LT |
974 | |
975 | memcpy(tmp_mac_addr, slave1->dev->dev_addr, ETH_ALEN); | |
976 | alb_set_slave_mac_addr(slave1, slave2->dev->dev_addr, bond->alb_info.rlb_enabled); | |
977 | alb_set_slave_mac_addr(slave2, tmp_mac_addr, bond->alb_info.rlb_enabled); | |
978 | ||
059fe7a5 JV |
979 | } |
980 | ||
981 | /* | |
982 | * Send learning packets after MAC address swap. | |
983 | * | |
2543331d | 984 | * Called with RTNL and no other locks |
059fe7a5 JV |
985 | */ |
986 | static void alb_fasten_mac_swap(struct bonding *bond, struct slave *slave1, | |
987 | struct slave *slave2) | |
988 | { | |
989 | int slaves_state_differ = (SLAVE_IS_OK(slave1) != SLAVE_IS_OK(slave2)); | |
990 | struct slave *disabled_slave = NULL; | |
991 | ||
2543331d JV |
992 | ASSERT_RTNL(); |
993 | ||
1da177e4 LT |
994 | /* fasten the change in the switch */ |
995 | if (SLAVE_IS_OK(slave1)) { | |
996 | alb_send_learning_packets(slave1, slave1->dev->dev_addr); | |
997 | if (bond->alb_info.rlb_enabled) { | |
998 | /* inform the clients that the mac address | |
999 | * has changed | |
1000 | */ | |
1001 | rlb_req_update_slave_clients(bond, slave1); | |
1002 | } | |
1003 | } else { | |
1004 | disabled_slave = slave1; | |
1005 | } | |
1006 | ||
1007 | if (SLAVE_IS_OK(slave2)) { | |
1008 | alb_send_learning_packets(slave2, slave2->dev->dev_addr); | |
1009 | if (bond->alb_info.rlb_enabled) { | |
1010 | /* inform the clients that the mac address | |
1011 | * has changed | |
1012 | */ | |
1013 | rlb_req_update_slave_clients(bond, slave2); | |
1014 | } | |
1015 | } else { | |
1016 | disabled_slave = slave2; | |
1017 | } | |
1018 | ||
1019 | if (bond->alb_info.rlb_enabled && slaves_state_differ) { | |
1020 | /* A disabled slave was assigned an active mac addr */ | |
1021 | rlb_teach_disabled_mac_on_primary(bond, | |
1022 | disabled_slave->dev->dev_addr); | |
1023 | } | |
1024 | } | |
1025 | ||
1026 | /** | |
1027 | * alb_change_hw_addr_on_detach | |
1028 | * @bond: bonding we're working on | |
1029 | * @slave: the slave that was just detached | |
1030 | * | |
1031 | * We assume that @slave was already detached from the slave list. | |
1032 | * | |
1033 | * If @slave's permanent hw address is different both from its current | |
1034 | * address and from @bond's address, then somewhere in the bond there's | |
1035 | * a slave that has @slave's permanet address as its current address. | |
1036 | * We'll make sure that that slave no longer uses @slave's permanent address. | |
1037 | * | |
2543331d | 1038 | * Caller must hold RTNL and no other locks |
1da177e4 LT |
1039 | */ |
1040 | static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *slave) | |
1041 | { | |
1042 | int perm_curr_diff; | |
1043 | int perm_bond_diff; | |
1044 | ||
885a136c ED |
1045 | perm_curr_diff = compare_ether_addr_64bits(slave->perm_hwaddr, |
1046 | slave->dev->dev_addr); | |
1047 | perm_bond_diff = compare_ether_addr_64bits(slave->perm_hwaddr, | |
1048 | bond->dev->dev_addr); | |
1da177e4 LT |
1049 | |
1050 | if (perm_curr_diff && perm_bond_diff) { | |
1051 | struct slave *tmp_slave; | |
1052 | int i, found = 0; | |
1053 | ||
1054 | bond_for_each_slave(bond, tmp_slave, i) { | |
885a136c ED |
1055 | if (!compare_ether_addr_64bits(slave->perm_hwaddr, |
1056 | tmp_slave->dev->dev_addr)) { | |
1da177e4 LT |
1057 | found = 1; |
1058 | break; | |
1059 | } | |
1060 | } | |
1061 | ||
1062 | if (found) { | |
059fe7a5 | 1063 | /* locking: needs RTNL and nothing else */ |
1da177e4 | 1064 | alb_swap_mac_addr(bond, slave, tmp_slave); |
059fe7a5 | 1065 | alb_fasten_mac_swap(bond, slave, tmp_slave); |
1da177e4 LT |
1066 | } |
1067 | } | |
1068 | } | |
1069 | ||
1070 | /** | |
1071 | * alb_handle_addr_collision_on_attach | |
1072 | * @bond: bonding we're working on | |
1073 | * @slave: the slave that was just attached | |
1074 | * | |
1075 | * checks uniqueness of slave's mac address and handles the case the | |
1076 | * new slave uses the bonds mac address. | |
1077 | * | |
1078 | * If the permanent hw address of @slave is @bond's hw address, we need to | |
1079 | * find a different hw address to give @slave, that isn't in use by any other | |
1080 | * slave in the bond. This address must be, of course, one of the premanent | |
1081 | * addresses of the other slaves. | |
1082 | * | |
1083 | * We go over the slave list, and for each slave there we compare its | |
1084 | * permanent hw address with the current address of all the other slaves. | |
1085 | * If no match was found, then we've found a slave with a permanent address | |
1086 | * that isn't used by any other slave in the bond, so we can assign it to | |
1087 | * @slave. | |
1088 | * | |
1089 | * assumption: this function is called before @slave is attached to the | |
1090 | * bond slave list. | |
1091 | * | |
1092 | * caller must hold the bond lock for write since the mac addresses are compared | |
1093 | * and may be swapped. | |
1094 | */ | |
1095 | static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slave *slave) | |
1096 | { | |
1097 | struct slave *tmp_slave1, *tmp_slave2, *free_mac_slave; | |
1098 | struct slave *has_bond_addr = bond->curr_active_slave; | |
1099 | int i, j, found = 0; | |
1100 | ||
1101 | if (bond->slave_cnt == 0) { | |
1102 | /* this is the first slave */ | |
1103 | return 0; | |
1104 | } | |
1105 | ||
1106 | /* if slave's mac address differs from bond's mac address | |
1107 | * check uniqueness of slave's mac address against the other | |
1108 | * slaves in the bond. | |
1109 | */ | |
885a136c | 1110 | if (compare_ether_addr_64bits(slave->perm_hwaddr, bond->dev->dev_addr)) { |
1da177e4 | 1111 | bond_for_each_slave(bond, tmp_slave1, i) { |
885a136c ED |
1112 | if (!compare_ether_addr_64bits(tmp_slave1->dev->dev_addr, |
1113 | slave->dev->dev_addr)) { | |
1da177e4 LT |
1114 | found = 1; |
1115 | break; | |
1116 | } | |
1117 | } | |
1118 | ||
6b38aefe JL |
1119 | if (!found) |
1120 | return 0; | |
1da177e4 | 1121 | |
6b38aefe JL |
1122 | /* Try setting slave mac to bond address and fall-through |
1123 | to code handling that situation below... */ | |
1124 | alb_set_slave_mac_addr(slave, bond->dev->dev_addr, | |
1125 | bond->alb_info.rlb_enabled); | |
1da177e4 LT |
1126 | } |
1127 | ||
1128 | /* The slave's address is equal to the address of the bond. | |
1129 | * Search for a spare address in the bond for this slave. | |
1130 | */ | |
1131 | free_mac_slave = NULL; | |
1132 | ||
1133 | bond_for_each_slave(bond, tmp_slave1, i) { | |
1134 | found = 0; | |
1135 | bond_for_each_slave(bond, tmp_slave2, j) { | |
885a136c ED |
1136 | if (!compare_ether_addr_64bits(tmp_slave1->perm_hwaddr, |
1137 | tmp_slave2->dev->dev_addr)) { | |
1da177e4 LT |
1138 | found = 1; |
1139 | break; | |
1140 | } | |
1141 | } | |
1142 | ||
1143 | if (!found) { | |
1144 | /* no slave has tmp_slave1's perm addr | |
1145 | * as its curr addr | |
1146 | */ | |
1147 | free_mac_slave = tmp_slave1; | |
1148 | break; | |
1149 | } | |
1150 | ||
1151 | if (!has_bond_addr) { | |
885a136c ED |
1152 | if (!compare_ether_addr_64bits(tmp_slave1->dev->dev_addr, |
1153 | bond->dev->dev_addr)) { | |
1da177e4 LT |
1154 | |
1155 | has_bond_addr = tmp_slave1; | |
1156 | } | |
1157 | } | |
1158 | } | |
1159 | ||
1160 | if (free_mac_slave) { | |
1161 | alb_set_slave_mac_addr(slave, free_mac_slave->perm_hwaddr, | |
1162 | bond->alb_info.rlb_enabled); | |
1163 | ||
a4aee5c8 | 1164 | 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 |
1165 | bond->dev->name, slave->dev->name, |
1166 | free_mac_slave->dev->name); | |
1da177e4 LT |
1167 | |
1168 | } else if (has_bond_addr) { | |
a4aee5c8 | 1169 | 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 | 1170 | bond->dev->name, slave->dev->name); |
1da177e4 LT |
1171 | return -EFAULT; |
1172 | } | |
1173 | ||
1174 | return 0; | |
1175 | } | |
1176 | ||
1177 | /** | |
1178 | * alb_set_mac_address | |
1179 | * @bond: | |
1180 | * @addr: | |
1181 | * | |
1182 | * In TLB mode all slaves are configured to the bond's hw address, but set | |
1183 | * their dev_addr field to different addresses (based on their permanent hw | |
1184 | * addresses). | |
1185 | * | |
1186 | * For each slave, this function sets the interface to the new address and then | |
1187 | * changes its dev_addr field to its previous value. | |
1188 | * | |
1189 | * Unwinding assumes bond's mac address has not yet changed. | |
1190 | */ | |
1191 | static int alb_set_mac_address(struct bonding *bond, void *addr) | |
1192 | { | |
1193 | struct sockaddr sa; | |
1194 | struct slave *slave, *stop_at; | |
1195 | char tmp_addr[ETH_ALEN]; | |
1196 | int res; | |
1197 | int i; | |
1198 | ||
1199 | if (bond->alb_info.rlb_enabled) { | |
1200 | return 0; | |
1201 | } | |
1202 | ||
1203 | bond_for_each_slave(bond, slave, i) { | |
1da177e4 LT |
1204 | /* save net_device's current hw address */ |
1205 | memcpy(tmp_addr, slave->dev->dev_addr, ETH_ALEN); | |
1206 | ||
1207 | res = dev_set_mac_address(slave->dev, addr); | |
1208 | ||
1209 | /* restore net_device's hw address */ | |
1210 | memcpy(slave->dev->dev_addr, tmp_addr, ETH_ALEN); | |
1211 | ||
eb7cc59a | 1212 | if (res) |
1da177e4 | 1213 | goto unwind; |
1da177e4 LT |
1214 | } |
1215 | ||
1216 | return 0; | |
1217 | ||
1218 | unwind: | |
1219 | memcpy(sa.sa_data, bond->dev->dev_addr, bond->dev->addr_len); | |
1220 | sa.sa_family = bond->dev->type; | |
1221 | ||
1222 | /* unwind from head to the slave that failed */ | |
1223 | stop_at = slave; | |
1224 | bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) { | |
1225 | memcpy(tmp_addr, slave->dev->dev_addr, ETH_ALEN); | |
1226 | dev_set_mac_address(slave->dev, &sa); | |
1227 | memcpy(slave->dev->dev_addr, tmp_addr, ETH_ALEN); | |
1228 | } | |
1229 | ||
1230 | return res; | |
1231 | } | |
1232 | ||
1233 | /************************ exported alb funcions ************************/ | |
1234 | ||
1235 | int bond_alb_initialize(struct bonding *bond, int rlb_enabled) | |
1236 | { | |
1237 | int res; | |
1238 | ||
1239 | res = tlb_initialize(bond); | |
1240 | if (res) { | |
1241 | return res; | |
1242 | } | |
1243 | ||
1244 | if (rlb_enabled) { | |
1245 | bond->alb_info.rlb_enabled = 1; | |
1246 | /* initialize rlb */ | |
1247 | res = rlb_initialize(bond); | |
1248 | if (res) { | |
1249 | tlb_deinitialize(bond); | |
1250 | return res; | |
1251 | } | |
b76850ab MW |
1252 | } else { |
1253 | bond->alb_info.rlb_enabled = 0; | |
1da177e4 LT |
1254 | } |
1255 | ||
1256 | return 0; | |
1257 | } | |
1258 | ||
1259 | void bond_alb_deinitialize(struct bonding *bond) | |
1260 | { | |
1261 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1262 | ||
1263 | tlb_deinitialize(bond); | |
1264 | ||
1265 | if (bond_info->rlb_enabled) { | |
1266 | rlb_deinitialize(bond); | |
1267 | } | |
1268 | } | |
1269 | ||
1270 | int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev) | |
1271 | { | |
454d7c9b | 1272 | struct bonding *bond = netdev_priv(bond_dev); |
1da177e4 LT |
1273 | struct ethhdr *eth_data; |
1274 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1275 | struct slave *tx_slave = NULL; | |
d3bb52b0 | 1276 | static const __be32 ip_bcast = htonl(0xffffffff); |
1da177e4 LT |
1277 | int hash_size = 0; |
1278 | int do_tx_balance = 1; | |
1279 | u32 hash_index = 0; | |
eddc9ec5 | 1280 | const u8 *hash_start = NULL; |
1da177e4 | 1281 | int res = 1; |
2d1ea19d | 1282 | struct ipv6hdr *ip6hdr; |
1da177e4 | 1283 | |
459a98ed | 1284 | skb_reset_mac_header(skb); |
1da177e4 LT |
1285 | eth_data = eth_hdr(skb); |
1286 | ||
1287 | /* make sure that the curr_active_slave and the slaves list do | |
1288 | * not change during tx | |
1289 | */ | |
1290 | read_lock(&bond->lock); | |
1291 | read_lock(&bond->curr_slave_lock); | |
1292 | ||
1293 | if (!BOND_IS_OK(bond)) { | |
1294 | goto out; | |
1295 | } | |
1296 | ||
1297 | switch (ntohs(skb->protocol)) { | |
eddc9ec5 ACM |
1298 | case ETH_P_IP: { |
1299 | const struct iphdr *iph = ip_hdr(skb); | |
1300 | ||
885a136c | 1301 | if (!compare_ether_addr_64bits(eth_data->h_dest, mac_bcast) || |
eddc9ec5 ACM |
1302 | (iph->daddr == ip_bcast) || |
1303 | (iph->protocol == IPPROTO_IGMP)) { | |
1da177e4 LT |
1304 | do_tx_balance = 0; |
1305 | break; | |
1306 | } | |
eddc9ec5 ACM |
1307 | hash_start = (char *)&(iph->daddr); |
1308 | hash_size = sizeof(iph->daddr); | |
1309 | } | |
1da177e4 LT |
1310 | break; |
1311 | case ETH_P_IPV6: | |
2d1ea19d VY |
1312 | /* IPv6 doesn't really use broadcast mac address, but leave |
1313 | * that here just in case. | |
1314 | */ | |
885a136c | 1315 | if (!compare_ether_addr_64bits(eth_data->h_dest, mac_bcast)) { |
1da177e4 LT |
1316 | do_tx_balance = 0; |
1317 | break; | |
2d1ea19d VY |
1318 | } |
1319 | ||
1320 | /* IPv6 uses all-nodes multicast as an equivalent to | |
1321 | * broadcasts in IPv4. | |
1322 | */ | |
885a136c | 1323 | if (!compare_ether_addr_64bits(eth_data->h_dest, mac_v6_allmcast)) { |
2d1ea19d VY |
1324 | do_tx_balance = 0; |
1325 | break; | |
1326 | } | |
1327 | ||
1328 | /* Additianally, DAD probes should not be tx-balanced as that | |
1329 | * will lead to false positives for duplicate addresses and | |
1330 | * prevent address configuration from working. | |
1331 | */ | |
1332 | ip6hdr = ipv6_hdr(skb); | |
1333 | if (ipv6_addr_any(&ip6hdr->saddr)) { | |
1334 | do_tx_balance = 0; | |
1335 | break; | |
1da177e4 LT |
1336 | } |
1337 | ||
0660e03f ACM |
1338 | hash_start = (char *)&(ipv6_hdr(skb)->daddr); |
1339 | hash_size = sizeof(ipv6_hdr(skb)->daddr); | |
1da177e4 LT |
1340 | break; |
1341 | case ETH_P_IPX: | |
d3bb52b0 | 1342 | if (ipx_hdr(skb)->ipx_checksum != IPX_NO_CHECKSUM) { |
1da177e4 LT |
1343 | /* something is wrong with this packet */ |
1344 | do_tx_balance = 0; | |
1345 | break; | |
1346 | } | |
1347 | ||
1348 | if (ipx_hdr(skb)->ipx_type != IPX_TYPE_NCP) { | |
1349 | /* The only protocol worth balancing in | |
1350 | * this family since it has an "ARP" like | |
1351 | * mechanism | |
1352 | */ | |
1353 | do_tx_balance = 0; | |
1354 | break; | |
1355 | } | |
1356 | ||
1357 | hash_start = (char*)eth_data->h_dest; | |
1358 | hash_size = ETH_ALEN; | |
1359 | break; | |
1360 | case ETH_P_ARP: | |
1361 | do_tx_balance = 0; | |
1362 | if (bond_info->rlb_enabled) { | |
1363 | tx_slave = rlb_arp_xmit(skb, bond); | |
1364 | } | |
1365 | break; | |
1366 | default: | |
1367 | do_tx_balance = 0; | |
1368 | break; | |
1369 | } | |
1370 | ||
1371 | if (do_tx_balance) { | |
1372 | hash_index = _simple_hash(hash_start, hash_size); | |
1373 | tx_slave = tlb_choose_channel(bond, hash_index, skb->len); | |
1374 | } | |
1375 | ||
1376 | if (!tx_slave) { | |
1377 | /* unbalanced or unassigned, send through primary */ | |
1378 | tx_slave = bond->curr_active_slave; | |
1379 | bond_info->unbalanced_load += skb->len; | |
1380 | } | |
1381 | ||
1382 | if (tx_slave && SLAVE_IS_OK(tx_slave)) { | |
1383 | if (tx_slave != bond->curr_active_slave) { | |
1384 | memcpy(eth_data->h_source, | |
1385 | tx_slave->dev->dev_addr, | |
1386 | ETH_ALEN); | |
1387 | } | |
1388 | ||
1389 | res = bond_dev_queue_xmit(bond, skb, tx_slave->dev); | |
1390 | } else { | |
1391 | if (tx_slave) { | |
1392 | tlb_clear_slave(bond, tx_slave, 0); | |
1393 | } | |
1394 | } | |
1395 | ||
1396 | out: | |
1397 | if (res) { | |
1398 | /* no suitable interface, frame not sent */ | |
1399 | dev_kfree_skb(skb); | |
1400 | } | |
1401 | read_unlock(&bond->curr_slave_lock); | |
1402 | read_unlock(&bond->lock); | |
ec634fe3 | 1403 | return NETDEV_TX_OK; |
1da177e4 LT |
1404 | } |
1405 | ||
1b76b316 | 1406 | void bond_alb_monitor(struct work_struct *work) |
1da177e4 | 1407 | { |
1b76b316 JV |
1408 | struct bonding *bond = container_of(work, struct bonding, |
1409 | alb_work.work); | |
1da177e4 LT |
1410 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
1411 | struct slave *slave; | |
1412 | int i; | |
1413 | ||
1414 | read_lock(&bond->lock); | |
1415 | ||
1416 | if (bond->kill_timers) { | |
1417 | goto out; | |
1418 | } | |
1419 | ||
1420 | if (bond->slave_cnt == 0) { | |
1421 | bond_info->tx_rebalance_counter = 0; | |
1422 | bond_info->lp_counter = 0; | |
1423 | goto re_arm; | |
1424 | } | |
1425 | ||
1426 | bond_info->tx_rebalance_counter++; | |
1427 | bond_info->lp_counter++; | |
1428 | ||
1429 | /* send learning packets */ | |
1430 | if (bond_info->lp_counter >= BOND_ALB_LP_TICKS) { | |
1431 | /* change of curr_active_slave involves swapping of mac addresses. | |
1432 | * in order to avoid this swapping from happening while | |
1433 | * sending the learning packets, the curr_slave_lock must be held for | |
1434 | * read. | |
1435 | */ | |
1436 | read_lock(&bond->curr_slave_lock); | |
1437 | ||
1438 | bond_for_each_slave(bond, slave, i) { | |
e944ef79 | 1439 | alb_send_learning_packets(slave, slave->dev->dev_addr); |
1da177e4 LT |
1440 | } |
1441 | ||
1442 | read_unlock(&bond->curr_slave_lock); | |
1443 | ||
1444 | bond_info->lp_counter = 0; | |
1445 | } | |
1446 | ||
1447 | /* rebalance tx traffic */ | |
1448 | if (bond_info->tx_rebalance_counter >= BOND_TLB_REBALANCE_TICKS) { | |
1449 | ||
1450 | read_lock(&bond->curr_slave_lock); | |
1451 | ||
1452 | bond_for_each_slave(bond, slave, i) { | |
1453 | tlb_clear_slave(bond, slave, 1); | |
1454 | if (slave == bond->curr_active_slave) { | |
1455 | SLAVE_TLB_INFO(slave).load = | |
1456 | bond_info->unbalanced_load / | |
1457 | BOND_TLB_REBALANCE_INTERVAL; | |
1458 | bond_info->unbalanced_load = 0; | |
1459 | } | |
1460 | } | |
1461 | ||
1462 | read_unlock(&bond->curr_slave_lock); | |
1463 | ||
1464 | bond_info->tx_rebalance_counter = 0; | |
1465 | } | |
1466 | ||
1467 | /* handle rlb stuff */ | |
1468 | if (bond_info->rlb_enabled) { | |
1da177e4 LT |
1469 | if (bond_info->primary_is_promisc && |
1470 | (++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) { | |
1471 | ||
d0e81b7e JV |
1472 | /* |
1473 | * dev_set_promiscuity requires rtnl and | |
1474 | * nothing else. | |
1475 | */ | |
1476 | read_unlock(&bond->lock); | |
1477 | rtnl_lock(); | |
1478 | ||
1da177e4 LT |
1479 | bond_info->rlb_promisc_timeout_counter = 0; |
1480 | ||
1481 | /* If the primary was set to promiscuous mode | |
1482 | * because a slave was disabled then | |
1483 | * it can now leave promiscuous mode. | |
1484 | */ | |
1485 | dev_set_promiscuity(bond->curr_active_slave->dev, -1); | |
1486 | bond_info->primary_is_promisc = 0; | |
1da177e4 | 1487 | |
d0e81b7e JV |
1488 | rtnl_unlock(); |
1489 | read_lock(&bond->lock); | |
1490 | } | |
1da177e4 LT |
1491 | |
1492 | if (bond_info->rlb_rebalance) { | |
1493 | bond_info->rlb_rebalance = 0; | |
1494 | rlb_rebalance(bond); | |
1495 | } | |
1496 | ||
1497 | /* check if clients need updating */ | |
1498 | if (bond_info->rx_ntt) { | |
1499 | if (bond_info->rlb_update_delay_counter) { | |
1500 | --bond_info->rlb_update_delay_counter; | |
1501 | } else { | |
1502 | rlb_update_rx_clients(bond); | |
1503 | if (bond_info->rlb_update_retry_counter) { | |
1504 | --bond_info->rlb_update_retry_counter; | |
1505 | } else { | |
1506 | bond_info->rx_ntt = 0; | |
1507 | } | |
1508 | } | |
1509 | } | |
1510 | } | |
1511 | ||
1512 | re_arm: | |
1b76b316 | 1513 | queue_delayed_work(bond->wq, &bond->alb_work, alb_delta_in_ticks); |
1da177e4 LT |
1514 | out: |
1515 | read_unlock(&bond->lock); | |
1516 | } | |
1517 | ||
1518 | /* assumption: called before the slave is attached to the bond | |
1519 | * and not locked by the bond lock | |
1520 | */ | |
1521 | int bond_alb_init_slave(struct bonding *bond, struct slave *slave) | |
1522 | { | |
1523 | int res; | |
1524 | ||
1525 | res = alb_set_slave_mac_addr(slave, slave->perm_hwaddr, | |
1526 | bond->alb_info.rlb_enabled); | |
1527 | if (res) { | |
1528 | return res; | |
1529 | } | |
1530 | ||
1531 | /* caller must hold the bond lock for write since the mac addresses | |
1532 | * are compared and may be swapped. | |
1533 | */ | |
6603a6f2 | 1534 | read_lock(&bond->lock); |
1da177e4 LT |
1535 | |
1536 | res = alb_handle_addr_collision_on_attach(bond, slave); | |
1537 | ||
6603a6f2 | 1538 | read_unlock(&bond->lock); |
1da177e4 LT |
1539 | |
1540 | if (res) { | |
1541 | return res; | |
1542 | } | |
1543 | ||
1544 | tlb_init_slave(slave); | |
1545 | ||
1546 | /* order a rebalance ASAP */ | |
1547 | bond->alb_info.tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS; | |
1548 | ||
1549 | if (bond->alb_info.rlb_enabled) { | |
1550 | bond->alb_info.rlb_rebalance = 1; | |
1551 | } | |
1552 | ||
1553 | return 0; | |
1554 | } | |
1555 | ||
2543331d JV |
1556 | /* |
1557 | * Remove slave from tlb and rlb hash tables, and fix up MAC addresses | |
1558 | * if necessary. | |
1559 | * | |
1560 | * Caller must hold RTNL and no other locks | |
1561 | */ | |
1da177e4 LT |
1562 | void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave) |
1563 | { | |
1564 | if (bond->slave_cnt > 1) { | |
1565 | alb_change_hw_addr_on_detach(bond, slave); | |
1566 | } | |
1567 | ||
1568 | tlb_clear_slave(bond, slave, 0); | |
1569 | ||
1570 | if (bond->alb_info.rlb_enabled) { | |
1571 | bond->alb_info.next_rx_slave = NULL; | |
1572 | rlb_clear_slave(bond, slave); | |
1573 | } | |
1574 | } | |
1575 | ||
1576 | /* Caller must hold bond lock for read */ | |
1577 | void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link) | |
1578 | { | |
1579 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1580 | ||
1581 | if (link == BOND_LINK_DOWN) { | |
1582 | tlb_clear_slave(bond, slave, 0); | |
1583 | if (bond->alb_info.rlb_enabled) { | |
1584 | rlb_clear_slave(bond, slave); | |
1585 | } | |
1586 | } else if (link == BOND_LINK_UP) { | |
1587 | /* order a rebalance ASAP */ | |
1588 | bond_info->tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS; | |
1589 | if (bond->alb_info.rlb_enabled) { | |
1590 | bond->alb_info.rlb_rebalance = 1; | |
1591 | /* If the updelay module parameter is smaller than the | |
1592 | * forwarding delay of the switch the rebalance will | |
1593 | * not work because the rebalance arp replies will | |
1594 | * not be forwarded to the clients.. | |
1595 | */ | |
1596 | } | |
1597 | } | |
1598 | } | |
1599 | ||
1600 | /** | |
1601 | * bond_alb_handle_active_change - assign new curr_active_slave | |
1602 | * @bond: our bonding struct | |
1603 | * @new_slave: new slave to assign | |
1604 | * | |
1605 | * Set the bond->curr_active_slave to @new_slave and handle | |
1606 | * mac address swapping and promiscuity changes as needed. | |
1607 | * | |
059fe7a5 JV |
1608 | * If new_slave is NULL, caller must hold curr_slave_lock or |
1609 | * bond->lock for write. | |
1610 | * | |
1611 | * If new_slave is not NULL, caller must hold RTNL, bond->lock for | |
1612 | * read and curr_slave_lock for write. Processing here may sleep, so | |
1613 | * no other locks may be held. | |
1da177e4 LT |
1614 | */ |
1615 | void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave) | |
1f78d9f9 HE |
1616 | __releases(&bond->curr_slave_lock) |
1617 | __releases(&bond->lock) | |
1618 | __acquires(&bond->lock) | |
1619 | __acquires(&bond->curr_slave_lock) | |
1da177e4 LT |
1620 | { |
1621 | struct slave *swap_slave; | |
1622 | int i; | |
1623 | ||
1624 | if (bond->curr_active_slave == new_slave) { | |
1625 | return; | |
1626 | } | |
1627 | ||
1628 | if (bond->curr_active_slave && bond->alb_info.primary_is_promisc) { | |
1629 | dev_set_promiscuity(bond->curr_active_slave->dev, -1); | |
1630 | bond->alb_info.primary_is_promisc = 0; | |
1631 | bond->alb_info.rlb_promisc_timeout_counter = 0; | |
1632 | } | |
1633 | ||
1634 | swap_slave = bond->curr_active_slave; | |
1635 | bond->curr_active_slave = new_slave; | |
1636 | ||
1637 | if (!new_slave || (bond->slave_cnt == 0)) { | |
1638 | return; | |
1639 | } | |
1640 | ||
1641 | /* set the new curr_active_slave to the bonds mac address | |
1642 | * i.e. swap mac addresses of old curr_active_slave and new curr_active_slave | |
1643 | */ | |
1644 | if (!swap_slave) { | |
1645 | struct slave *tmp_slave; | |
1646 | /* find slave that is holding the bond's mac address */ | |
1647 | bond_for_each_slave(bond, tmp_slave, i) { | |
885a136c ED |
1648 | if (!compare_ether_addr_64bits(tmp_slave->dev->dev_addr, |
1649 | bond->dev->dev_addr)) { | |
1da177e4 LT |
1650 | swap_slave = tmp_slave; |
1651 | break; | |
1652 | } | |
1653 | } | |
1654 | } | |
1655 | ||
059fe7a5 JV |
1656 | /* |
1657 | * Arrange for swap_slave and new_slave to temporarily be | |
1658 | * ignored so we can mess with their MAC addresses without | |
1659 | * fear of interference from transmit activity. | |
1660 | */ | |
1661 | if (swap_slave) { | |
1662 | tlb_clear_slave(bond, swap_slave, 1); | |
1663 | } | |
1664 | tlb_clear_slave(bond, new_slave, 1); | |
1665 | ||
1666 | write_unlock_bh(&bond->curr_slave_lock); | |
1667 | read_unlock(&bond->lock); | |
1668 | ||
e0138a66 JV |
1669 | ASSERT_RTNL(); |
1670 | ||
1da177e4 LT |
1671 | /* curr_active_slave must be set before calling alb_swap_mac_addr */ |
1672 | if (swap_slave) { | |
1673 | /* swap mac address */ | |
1674 | alb_swap_mac_addr(bond, swap_slave, new_slave); | |
1675 | } else { | |
1676 | /* set the new_slave to the bond mac address */ | |
1677 | alb_set_slave_mac_addr(new_slave, bond->dev->dev_addr, | |
1678 | bond->alb_info.rlb_enabled); | |
059fe7a5 JV |
1679 | } |
1680 | ||
059fe7a5 JV |
1681 | if (swap_slave) { |
1682 | alb_fasten_mac_swap(bond, swap_slave, new_slave); | |
2543331d | 1683 | read_lock(&bond->lock); |
059fe7a5 | 1684 | } else { |
2543331d | 1685 | read_lock(&bond->lock); |
1da177e4 LT |
1686 | alb_send_learning_packets(new_slave, bond->dev->dev_addr); |
1687 | } | |
059fe7a5 JV |
1688 | |
1689 | write_lock_bh(&bond->curr_slave_lock); | |
1da177e4 LT |
1690 | } |
1691 | ||
059fe7a5 JV |
1692 | /* |
1693 | * Called with RTNL | |
1694 | */ | |
1da177e4 | 1695 | int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr) |
1f78d9f9 | 1696 | __acquires(&bond->lock) |
815bcc27 | 1697 | __releases(&bond->lock) |
1da177e4 | 1698 | { |
454d7c9b | 1699 | struct bonding *bond = netdev_priv(bond_dev); |
1da177e4 LT |
1700 | struct sockaddr *sa = addr; |
1701 | struct slave *slave, *swap_slave; | |
1702 | int res; | |
1703 | int i; | |
1704 | ||
1705 | if (!is_valid_ether_addr(sa->sa_data)) { | |
1706 | return -EADDRNOTAVAIL; | |
1707 | } | |
1708 | ||
1709 | res = alb_set_mac_address(bond, addr); | |
1710 | if (res) { | |
1711 | return res; | |
1712 | } | |
1713 | ||
1714 | memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len); | |
1715 | ||
1716 | /* If there is no curr_active_slave there is nothing else to do. | |
1717 | * Otherwise we'll need to pass the new address to it and handle | |
1718 | * duplications. | |
1719 | */ | |
1720 | if (!bond->curr_active_slave) { | |
1721 | return 0; | |
1722 | } | |
1723 | ||
1724 | swap_slave = NULL; | |
1725 | ||
1726 | bond_for_each_slave(bond, slave, i) { | |
885a136c ED |
1727 | if (!compare_ether_addr_64bits(slave->dev->dev_addr, |
1728 | bond_dev->dev_addr)) { | |
1da177e4 LT |
1729 | swap_slave = slave; |
1730 | break; | |
1731 | } | |
1732 | } | |
1733 | ||
1734 | if (swap_slave) { | |
1735 | alb_swap_mac_addr(bond, swap_slave, bond->curr_active_slave); | |
059fe7a5 | 1736 | alb_fasten_mac_swap(bond, swap_slave, bond->curr_active_slave); |
1da177e4 LT |
1737 | } else { |
1738 | alb_set_slave_mac_addr(bond->curr_active_slave, bond_dev->dev_addr, | |
1739 | bond->alb_info.rlb_enabled); | |
1740 | ||
815bcc27 | 1741 | read_lock(&bond->lock); |
1da177e4 LT |
1742 | alb_send_learning_packets(bond->curr_active_slave, bond_dev->dev_addr); |
1743 | if (bond->alb_info.rlb_enabled) { | |
1744 | /* inform clients mac address has changed */ | |
1745 | rlb_req_update_slave_clients(bond, bond->curr_active_slave); | |
1746 | } | |
815bcc27 | 1747 | read_unlock(&bond->lock); |
1da177e4 LT |
1748 | } |
1749 | ||
1750 | return 0; | |
1751 | } | |
1752 | ||
1753 | void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id) | |
1754 | { | |
1755 | if (bond->alb_info.current_alb_vlan && | |
1756 | (bond->alb_info.current_alb_vlan->vlan_id == vlan_id)) { | |
1757 | bond->alb_info.current_alb_vlan = NULL; | |
1758 | } | |
1759 | ||
1760 | if (bond->alb_info.rlb_enabled) { | |
1761 | rlb_clear_vlan(bond, vlan_id); | |
1762 | } | |
1763 | } | |
1764 |