Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License as published by the | |
6 | * Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but | |
10 | * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
11 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 | * for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along | |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
17 | * | |
18 | * The full GNU General Public License is included in this distribution in the | |
19 | * file called LICENSE. | |
20 | * | |
1da177e4 LT |
21 | */ |
22 | ||
1da177e4 LT |
23 | #include <linux/skbuff.h> |
24 | #include <linux/netdevice.h> | |
25 | #include <linux/etherdevice.h> | |
26 | #include <linux/pkt_sched.h> | |
27 | #include <linux/spinlock.h> | |
28 | #include <linux/slab.h> | |
29 | #include <linux/timer.h> | |
30 | #include <linux/ip.h> | |
31 | #include <linux/ipv6.h> | |
32 | #include <linux/if_arp.h> | |
33 | #include <linux/if_ether.h> | |
34 | #include <linux/if_bonding.h> | |
35 | #include <linux/if_vlan.h> | |
36 | #include <linux/in.h> | |
37 | #include <net/ipx.h> | |
38 | #include <net/arp.h> | |
2d1ea19d | 39 | #include <net/ipv6.h> |
1da177e4 LT |
40 | #include <asm/byteorder.h> |
41 | #include "bonding.h" | |
42 | #include "bond_alb.h" | |
43 | ||
44 | ||
45 | #define ALB_TIMER_TICKS_PER_SEC 10 /* should be a divisor of HZ */ | |
46 | #define BOND_TLB_REBALANCE_INTERVAL 10 /* In seconds, periodic re-balancing. | |
47 | * Used for division - never set | |
48 | * to zero !!! | |
49 | */ | |
50 | #define BOND_ALB_LP_INTERVAL 1 /* In seconds, periodic send of | |
51 | * learning packets to the switch | |
52 | */ | |
53 | ||
54 | #define BOND_TLB_REBALANCE_TICKS (BOND_TLB_REBALANCE_INTERVAL \ | |
55 | * ALB_TIMER_TICKS_PER_SEC) | |
56 | ||
57 | #define BOND_ALB_LP_TICKS (BOND_ALB_LP_INTERVAL \ | |
58 | * ALB_TIMER_TICKS_PER_SEC) | |
59 | ||
60 | #define TLB_HASH_TABLE_SIZE 256 /* The size of the clients hash table. | |
61 | * Note that this value MUST NOT be smaller | |
62 | * because the key hash table is BYTE wide ! | |
63 | */ | |
64 | ||
65 | ||
66 | #define TLB_NULL_INDEX 0xffffffff | |
67 | #define MAX_LP_BURST 3 | |
68 | ||
69 | /* rlb defs */ | |
70 | #define RLB_HASH_TABLE_SIZE 256 | |
71 | #define RLB_NULL_INDEX 0xffffffff | |
72 | #define RLB_UPDATE_DELAY 2*ALB_TIMER_TICKS_PER_SEC /* 2 seconds */ | |
73 | #define RLB_ARP_BURST_SIZE 2 | |
74 | #define RLB_UPDATE_RETRY 3 /* 3-ticks - must be smaller than the rlb | |
75 | * rebalance interval (5 min). | |
76 | */ | |
77 | /* RLB_PROMISC_TIMEOUT = 10 sec equals the time that the current slave is | |
78 | * promiscuous after failover | |
79 | */ | |
80 | #define RLB_PROMISC_TIMEOUT 10*ALB_TIMER_TICKS_PER_SEC | |
81 | ||
885a136c ED |
82 | #ifndef __long_aligned |
83 | #define __long_aligned __attribute__((aligned((sizeof(long))))) | |
84 | #endif | |
85 | static const u8 mac_bcast[ETH_ALEN] __long_aligned = { | |
86 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff | |
87 | }; | |
88 | static const u8 mac_v6_allmcast[ETH_ALEN] __long_aligned = { | |
89 | 0x33, 0x33, 0x00, 0x00, 0x00, 0x01 | |
90 | }; | |
1da177e4 LT |
91 | static const int alb_delta_in_ticks = HZ / ALB_TIMER_TICKS_PER_SEC; |
92 | ||
93 | #pragma pack(1) | |
94 | struct learning_pkt { | |
95 | u8 mac_dst[ETH_ALEN]; | |
96 | u8 mac_src[ETH_ALEN]; | |
d3bb52b0 | 97 | __be16 type; |
1da177e4 LT |
98 | u8 padding[ETH_ZLEN - ETH_HLEN]; |
99 | }; | |
100 | ||
101 | struct arp_pkt { | |
d3bb52b0 AV |
102 | __be16 hw_addr_space; |
103 | __be16 prot_addr_space; | |
1da177e4 LT |
104 | u8 hw_addr_len; |
105 | u8 prot_addr_len; | |
d3bb52b0 | 106 | __be16 op_code; |
1da177e4 | 107 | u8 mac_src[ETH_ALEN]; /* sender hardware address */ |
d3bb52b0 | 108 | __be32 ip_src; /* sender IP address */ |
1da177e4 | 109 | u8 mac_dst[ETH_ALEN]; /* target hardware address */ |
d3bb52b0 | 110 | __be32 ip_dst; /* target IP address */ |
1da177e4 LT |
111 | }; |
112 | #pragma pack() | |
113 | ||
a16aeb36 ACM |
114 | static inline struct arp_pkt *arp_pkt(const struct sk_buff *skb) |
115 | { | |
d56f90a7 | 116 | return (struct arp_pkt *)skb_network_header(skb); |
a16aeb36 ACM |
117 | } |
118 | ||
1da177e4 LT |
119 | /* Forward declaration */ |
120 | static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[]); | |
121 | ||
eddc9ec5 | 122 | static inline u8 _simple_hash(const u8 *hash_start, int hash_size) |
1da177e4 LT |
123 | { |
124 | int i; | |
125 | u8 hash = 0; | |
126 | ||
127 | for (i = 0; i < hash_size; i++) { | |
128 | hash ^= hash_start[i]; | |
129 | } | |
130 | ||
131 | return hash; | |
132 | } | |
133 | ||
134 | /*********************** tlb specific functions ***************************/ | |
135 | ||
136 | static inline void _lock_tx_hashtbl(struct bonding *bond) | |
137 | { | |
6603a6f2 | 138 | spin_lock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock)); |
1da177e4 LT |
139 | } |
140 | ||
141 | static inline void _unlock_tx_hashtbl(struct bonding *bond) | |
142 | { | |
6603a6f2 | 143 | spin_unlock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock)); |
1da177e4 LT |
144 | } |
145 | ||
146 | /* Caller must hold tx_hashtbl lock */ | |
147 | static inline void tlb_init_table_entry(struct tlb_client_info *entry, int save_load) | |
148 | { | |
149 | if (save_load) { | |
150 | entry->load_history = 1 + entry->tx_bytes / | |
151 | BOND_TLB_REBALANCE_INTERVAL; | |
152 | entry->tx_bytes = 0; | |
153 | } | |
154 | ||
155 | entry->tx_slave = NULL; | |
156 | entry->next = TLB_NULL_INDEX; | |
157 | entry->prev = TLB_NULL_INDEX; | |
158 | } | |
159 | ||
160 | static inline void tlb_init_slave(struct slave *slave) | |
161 | { | |
162 | SLAVE_TLB_INFO(slave).load = 0; | |
163 | SLAVE_TLB_INFO(slave).head = TLB_NULL_INDEX; | |
164 | } | |
165 | ||
166 | /* Caller must hold bond lock for read */ | |
167 | static void tlb_clear_slave(struct bonding *bond, struct slave *slave, int save_load) | |
168 | { | |
169 | struct tlb_client_info *tx_hash_table; | |
170 | u32 index; | |
171 | ||
172 | _lock_tx_hashtbl(bond); | |
173 | ||
174 | /* clear slave from tx_hashtbl */ | |
175 | tx_hash_table = BOND_ALB_INFO(bond).tx_hashtbl; | |
176 | ||
ce39a800 AG |
177 | /* skip this if we've already freed the tx hash table */ |
178 | if (tx_hash_table) { | |
179 | index = SLAVE_TLB_INFO(slave).head; | |
180 | while (index != TLB_NULL_INDEX) { | |
181 | u32 next_index = tx_hash_table[index].next; | |
182 | tlb_init_table_entry(&tx_hash_table[index], save_load); | |
183 | index = next_index; | |
184 | } | |
1da177e4 LT |
185 | } |
186 | ||
1da177e4 | 187 | tlb_init_slave(slave); |
5af47b2f JV |
188 | |
189 | _unlock_tx_hashtbl(bond); | |
1da177e4 LT |
190 | } |
191 | ||
192 | /* Must be called before starting the monitor timer */ | |
193 | static int tlb_initialize(struct bonding *bond) | |
194 | { | |
195 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
196 | int size = TLB_HASH_TABLE_SIZE * sizeof(struct tlb_client_info); | |
0d206a3a | 197 | struct tlb_client_info *new_hashtbl; |
1da177e4 LT |
198 | int i; |
199 | ||
200 | spin_lock_init(&(bond_info->tx_hashtbl_lock)); | |
201 | ||
243cb4e5 | 202 | new_hashtbl = kzalloc(size, GFP_KERNEL); |
0d206a3a | 203 | if (!new_hashtbl) { |
e5e2a8fd | 204 | pr_err(DRV_NAME |
4e0952c7 | 205 | ": %s: Error: Failed to allocate TLB hash table\n", |
1da177e4 | 206 | bond->dev->name); |
1da177e4 LT |
207 | return -1; |
208 | } | |
0d206a3a MW |
209 | _lock_tx_hashtbl(bond); |
210 | ||
211 | bond_info->tx_hashtbl = new_hashtbl; | |
1da177e4 | 212 | |
1da177e4 LT |
213 | for (i = 0; i < TLB_HASH_TABLE_SIZE; i++) { |
214 | tlb_init_table_entry(&bond_info->tx_hashtbl[i], 1); | |
215 | } | |
216 | ||
217 | _unlock_tx_hashtbl(bond); | |
218 | ||
219 | return 0; | |
220 | } | |
221 | ||
222 | /* Must be called only after all slaves have been released */ | |
223 | static void tlb_deinitialize(struct bonding *bond) | |
224 | { | |
225 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
226 | ||
227 | _lock_tx_hashtbl(bond); | |
228 | ||
229 | kfree(bond_info->tx_hashtbl); | |
230 | bond_info->tx_hashtbl = NULL; | |
231 | ||
232 | _unlock_tx_hashtbl(bond); | |
233 | } | |
234 | ||
235 | /* Caller must hold bond lock for read */ | |
236 | static struct slave *tlb_get_least_loaded_slave(struct bonding *bond) | |
237 | { | |
238 | struct slave *slave, *least_loaded; | |
239 | s64 max_gap; | |
240 | int i, found = 0; | |
241 | ||
242 | /* Find the first enabled slave */ | |
243 | bond_for_each_slave(bond, slave, i) { | |
244 | if (SLAVE_IS_OK(slave)) { | |
245 | found = 1; | |
246 | break; | |
247 | } | |
248 | } | |
249 | ||
250 | if (!found) { | |
251 | return NULL; | |
252 | } | |
253 | ||
254 | least_loaded = slave; | |
255 | max_gap = (s64)(slave->speed << 20) - /* Convert to Megabit per sec */ | |
256 | (s64)(SLAVE_TLB_INFO(slave).load << 3); /* Bytes to bits */ | |
257 | ||
258 | /* Find the slave with the largest gap */ | |
259 | bond_for_each_slave_from(bond, slave, i, least_loaded) { | |
260 | if (SLAVE_IS_OK(slave)) { | |
261 | s64 gap = (s64)(slave->speed << 20) - | |
262 | (s64)(SLAVE_TLB_INFO(slave).load << 3); | |
263 | if (max_gap < gap) { | |
264 | least_loaded = slave; | |
265 | max_gap = gap; | |
266 | } | |
267 | } | |
268 | } | |
269 | ||
270 | return least_loaded; | |
271 | } | |
272 | ||
273 | /* Caller must hold bond lock for read */ | |
274 | static struct slave *tlb_choose_channel(struct bonding *bond, u32 hash_index, u32 skb_len) | |
275 | { | |
276 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
277 | struct tlb_client_info *hash_table; | |
278 | struct slave *assigned_slave; | |
279 | ||
280 | _lock_tx_hashtbl(bond); | |
281 | ||
282 | hash_table = bond_info->tx_hashtbl; | |
283 | assigned_slave = hash_table[hash_index].tx_slave; | |
284 | if (!assigned_slave) { | |
285 | assigned_slave = tlb_get_least_loaded_slave(bond); | |
286 | ||
287 | if (assigned_slave) { | |
288 | struct tlb_slave_info *slave_info = | |
289 | &(SLAVE_TLB_INFO(assigned_slave)); | |
290 | u32 next_index = slave_info->head; | |
291 | ||
292 | hash_table[hash_index].tx_slave = assigned_slave; | |
293 | hash_table[hash_index].next = next_index; | |
294 | hash_table[hash_index].prev = TLB_NULL_INDEX; | |
295 | ||
296 | if (next_index != TLB_NULL_INDEX) { | |
297 | hash_table[next_index].prev = hash_index; | |
298 | } | |
299 | ||
300 | slave_info->head = hash_index; | |
301 | slave_info->load += | |
302 | hash_table[hash_index].load_history; | |
303 | } | |
304 | } | |
305 | ||
306 | if (assigned_slave) { | |
307 | hash_table[hash_index].tx_bytes += skb_len; | |
308 | } | |
309 | ||
310 | _unlock_tx_hashtbl(bond); | |
311 | ||
312 | return assigned_slave; | |
313 | } | |
314 | ||
315 | /*********************** rlb specific functions ***************************/ | |
316 | static inline void _lock_rx_hashtbl(struct bonding *bond) | |
317 | { | |
6603a6f2 | 318 | spin_lock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock)); |
1da177e4 LT |
319 | } |
320 | ||
321 | static inline void _unlock_rx_hashtbl(struct bonding *bond) | |
322 | { | |
6603a6f2 | 323 | spin_unlock_bh(&(BOND_ALB_INFO(bond).rx_hashtbl_lock)); |
1da177e4 LT |
324 | } |
325 | ||
326 | /* when an ARP REPLY is received from a client update its info | |
327 | * in the rx_hashtbl | |
328 | */ | |
329 | static void rlb_update_entry_from_arp(struct bonding *bond, struct arp_pkt *arp) | |
330 | { | |
331 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
332 | struct rlb_client_info *client_info; | |
333 | u32 hash_index; | |
334 | ||
335 | _lock_rx_hashtbl(bond); | |
336 | ||
337 | hash_index = _simple_hash((u8*)&(arp->ip_src), sizeof(arp->ip_src)); | |
338 | client_info = &(bond_info->rx_hashtbl[hash_index]); | |
339 | ||
340 | if ((client_info->assigned) && | |
341 | (client_info->ip_src == arp->ip_dst) && | |
342 | (client_info->ip_dst == arp->ip_src)) { | |
343 | /* update the clients MAC address */ | |
344 | memcpy(client_info->mac_dst, arp->mac_src, ETH_ALEN); | |
345 | client_info->ntt = 1; | |
346 | bond_info->rx_ntt = 1; | |
347 | } | |
348 | ||
349 | _unlock_rx_hashtbl(bond); | |
350 | } | |
351 | ||
f2ccd8fa | 352 | static int rlb_arp_recv(struct sk_buff *skb, struct net_device *bond_dev, struct packet_type *ptype, struct net_device *orig_dev) |
1da177e4 | 353 | { |
6146b1a4 | 354 | struct bonding *bond; |
1da177e4 LT |
355 | struct arp_pkt *arp = (struct arp_pkt *)skb->data; |
356 | int res = NET_RX_DROP; | |
357 | ||
6146b1a4 JV |
358 | while (bond_dev->priv_flags & IFF_802_1Q_VLAN) |
359 | bond_dev = vlan_dev_real_dev(bond_dev); | |
360 | ||
361 | if (!(bond_dev->priv_flags & IFF_BONDING) || | |
362 | !(bond_dev->flags & IFF_MASTER)) | |
1da177e4 | 363 | goto out; |
1da177e4 LT |
364 | |
365 | if (!arp) { | |
5a03cdb7 | 366 | pr_debug("Packet has no ARP data\n"); |
1da177e4 LT |
367 | goto out; |
368 | } | |
369 | ||
370 | if (skb->len < sizeof(struct arp_pkt)) { | |
5a03cdb7 | 371 | pr_debug("Packet is too small to be an ARP\n"); |
1da177e4 LT |
372 | goto out; |
373 | } | |
374 | ||
375 | if (arp->op_code == htons(ARPOP_REPLY)) { | |
376 | /* update rx hash table for this ARP */ | |
454d7c9b | 377 | bond = netdev_priv(bond_dev); |
1da177e4 | 378 | rlb_update_entry_from_arp(bond, arp); |
5a03cdb7 | 379 | pr_debug("Server received an ARP Reply from client\n"); |
1da177e4 LT |
380 | } |
381 | ||
382 | res = NET_RX_SUCCESS; | |
383 | ||
384 | out: | |
385 | dev_kfree_skb(skb); | |
386 | ||
387 | return res; | |
388 | } | |
389 | ||
390 | /* Caller must hold bond lock for read */ | |
391 | static struct slave *rlb_next_rx_slave(struct bonding *bond) | |
392 | { | |
393 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
394 | struct slave *rx_slave, *slave, *start_at; | |
395 | int i = 0; | |
396 | ||
397 | if (bond_info->next_rx_slave) { | |
398 | start_at = bond_info->next_rx_slave; | |
399 | } else { | |
400 | start_at = bond->first_slave; | |
401 | } | |
402 | ||
403 | rx_slave = NULL; | |
404 | ||
405 | bond_for_each_slave_from(bond, slave, i, start_at) { | |
406 | if (SLAVE_IS_OK(slave)) { | |
407 | if (!rx_slave) { | |
408 | rx_slave = slave; | |
409 | } else if (slave->speed > rx_slave->speed) { | |
410 | rx_slave = slave; | |
411 | } | |
412 | } | |
413 | } | |
414 | ||
415 | if (rx_slave) { | |
416 | bond_info->next_rx_slave = rx_slave->next; | |
417 | } | |
418 | ||
419 | return rx_slave; | |
420 | } | |
421 | ||
422 | /* teach the switch the mac of a disabled slave | |
423 | * on the primary for fault tolerance | |
424 | * | |
425 | * Caller must hold bond->curr_slave_lock for write or bond lock for write | |
426 | */ | |
427 | static void rlb_teach_disabled_mac_on_primary(struct bonding *bond, u8 addr[]) | |
428 | { | |
429 | if (!bond->curr_active_slave) { | |
430 | return; | |
431 | } | |
432 | ||
433 | if (!bond->alb_info.primary_is_promisc) { | |
7e1a1ac1 WC |
434 | if (!dev_set_promiscuity(bond->curr_active_slave->dev, 1)) |
435 | bond->alb_info.primary_is_promisc = 1; | |
436 | else | |
437 | bond->alb_info.primary_is_promisc = 0; | |
1da177e4 LT |
438 | } |
439 | ||
440 | bond->alb_info.rlb_promisc_timeout_counter = 0; | |
441 | ||
442 | alb_send_learning_packets(bond->curr_active_slave, addr); | |
443 | } | |
444 | ||
445 | /* slave being removed should not be active at this point | |
446 | * | |
447 | * Caller must hold bond lock for read | |
448 | */ | |
449 | static void rlb_clear_slave(struct bonding *bond, struct slave *slave) | |
450 | { | |
451 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
452 | struct rlb_client_info *rx_hash_table; | |
453 | u32 index, next_index; | |
454 | ||
455 | /* clear slave from rx_hashtbl */ | |
456 | _lock_rx_hashtbl(bond); | |
457 | ||
458 | rx_hash_table = bond_info->rx_hashtbl; | |
459 | index = bond_info->rx_hashtbl_head; | |
460 | for (; index != RLB_NULL_INDEX; index = next_index) { | |
461 | next_index = rx_hash_table[index].next; | |
462 | if (rx_hash_table[index].slave == slave) { | |
463 | struct slave *assigned_slave = rlb_next_rx_slave(bond); | |
464 | ||
465 | if (assigned_slave) { | |
466 | rx_hash_table[index].slave = assigned_slave; | |
885a136c ED |
467 | if (compare_ether_addr_64bits(rx_hash_table[index].mac_dst, |
468 | mac_bcast)) { | |
1da177e4 LT |
469 | bond_info->rx_hashtbl[index].ntt = 1; |
470 | bond_info->rx_ntt = 1; | |
471 | /* A slave has been removed from the | |
472 | * table because it is either disabled | |
473 | * or being released. We must retry the | |
474 | * update to avoid clients from not | |
475 | * being updated & disconnecting when | |
476 | * there is stress | |
477 | */ | |
478 | bond_info->rlb_update_retry_counter = | |
479 | RLB_UPDATE_RETRY; | |
480 | } | |
481 | } else { /* there is no active slave */ | |
482 | rx_hash_table[index].slave = NULL; | |
483 | } | |
484 | } | |
485 | } | |
486 | ||
487 | _unlock_rx_hashtbl(bond); | |
488 | ||
6603a6f2 | 489 | write_lock_bh(&bond->curr_slave_lock); |
1da177e4 LT |
490 | |
491 | if (slave != bond->curr_active_slave) { | |
492 | rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr); | |
493 | } | |
494 | ||
6603a6f2 | 495 | write_unlock_bh(&bond->curr_slave_lock); |
1da177e4 LT |
496 | } |
497 | ||
498 | static void rlb_update_client(struct rlb_client_info *client_info) | |
499 | { | |
500 | int i; | |
501 | ||
502 | if (!client_info->slave) { | |
503 | return; | |
504 | } | |
505 | ||
506 | for (i = 0; i < RLB_ARP_BURST_SIZE; i++) { | |
507 | struct sk_buff *skb; | |
508 | ||
509 | skb = arp_create(ARPOP_REPLY, ETH_P_ARP, | |
510 | client_info->ip_dst, | |
511 | client_info->slave->dev, | |
512 | client_info->ip_src, | |
513 | client_info->mac_dst, | |
514 | client_info->slave->dev->dev_addr, | |
515 | client_info->mac_dst); | |
516 | if (!skb) { | |
e5e2a8fd | 517 | pr_err(DRV_NAME |
4e0952c7 MW |
518 | ": %s: Error: failed to create an ARP packet\n", |
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) { | |
e5e2a8fd | 528 | pr_err(DRV_NAME |
4e0952c7 MW |
529 | ": %s: Error: failed to insert VLAN tag\n", |
530 | client_info->slave->dev->master->name); | |
1da177e4 LT |
531 | continue; |
532 | } | |
533 | } | |
534 | ||
535 | arp_xmit(skb); | |
536 | } | |
537 | } | |
538 | ||
539 | /* sends ARP REPLIES that update the clients that need updating */ | |
540 | static void rlb_update_rx_clients(struct bonding *bond) | |
541 | { | |
542 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
543 | struct rlb_client_info *client_info; | |
544 | u32 hash_index; | |
545 | ||
546 | _lock_rx_hashtbl(bond); | |
547 | ||
548 | hash_index = bond_info->rx_hashtbl_head; | |
549 | for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) { | |
550 | client_info = &(bond_info->rx_hashtbl[hash_index]); | |
551 | if (client_info->ntt) { | |
552 | rlb_update_client(client_info); | |
553 | if (bond_info->rlb_update_retry_counter == 0) { | |
554 | client_info->ntt = 0; | |
555 | } | |
556 | } | |
557 | } | |
558 | ||
94e2bd68 | 559 | /* do not update the entries again until this counter is zero so that |
1da177e4 LT |
560 | * not to confuse the clients. |
561 | */ | |
562 | bond_info->rlb_update_delay_counter = RLB_UPDATE_DELAY; | |
563 | ||
564 | _unlock_rx_hashtbl(bond); | |
565 | } | |
566 | ||
567 | /* The slave was assigned a new mac address - update the clients */ | |
568 | static void rlb_req_update_slave_clients(struct bonding *bond, struct slave *slave) | |
569 | { | |
570 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
571 | struct rlb_client_info *client_info; | |
572 | int ntt = 0; | |
573 | u32 hash_index; | |
574 | ||
575 | _lock_rx_hashtbl(bond); | |
576 | ||
577 | hash_index = bond_info->rx_hashtbl_head; | |
578 | for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) { | |
579 | client_info = &(bond_info->rx_hashtbl[hash_index]); | |
580 | ||
581 | if ((client_info->slave == slave) && | |
885a136c | 582 | compare_ether_addr_64bits(client_info->mac_dst, mac_bcast)) { |
1da177e4 LT |
583 | client_info->ntt = 1; |
584 | ntt = 1; | |
585 | } | |
586 | } | |
587 | ||
588 | // update the team's flag only after the whole iteration | |
589 | if (ntt) { | |
590 | bond_info->rx_ntt = 1; | |
591 | //fasten the change | |
592 | bond_info->rlb_update_retry_counter = RLB_UPDATE_RETRY; | |
593 | } | |
594 | ||
595 | _unlock_rx_hashtbl(bond); | |
596 | } | |
597 | ||
598 | /* mark all clients using src_ip to be updated */ | |
d3bb52b0 | 599 | static void rlb_req_update_subnet_clients(struct bonding *bond, __be32 src_ip) |
1da177e4 LT |
600 | { |
601 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
602 | struct rlb_client_info *client_info; | |
603 | u32 hash_index; | |
604 | ||
605 | _lock_rx_hashtbl(bond); | |
606 | ||
607 | hash_index = bond_info->rx_hashtbl_head; | |
608 | for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) { | |
609 | client_info = &(bond_info->rx_hashtbl[hash_index]); | |
610 | ||
611 | if (!client_info->slave) { | |
e5e2a8fd | 612 | pr_err(DRV_NAME |
4e0952c7 MW |
613 | ": %s: Error: found a client with no channel in " |
614 | "the client's hash table\n", | |
615 | bond->dev->name); | |
1da177e4 LT |
616 | continue; |
617 | } | |
618 | /*update all clients using this src_ip, that are not assigned | |
619 | * to the team's address (curr_active_slave) and have a known | |
620 | * unicast mac address. | |
621 | */ | |
622 | if ((client_info->ip_src == src_ip) && | |
885a136c ED |
623 | compare_ether_addr_64bits(client_info->slave->dev->dev_addr, |
624 | bond->dev->dev_addr) && | |
625 | compare_ether_addr_64bits(client_info->mac_dst, mac_bcast)) { | |
1da177e4 LT |
626 | client_info->ntt = 1; |
627 | bond_info->rx_ntt = 1; | |
628 | } | |
629 | } | |
630 | ||
631 | _unlock_rx_hashtbl(bond); | |
632 | } | |
633 | ||
634 | /* Caller must hold both bond and ptr locks for read */ | |
635 | static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bond) | |
636 | { | |
637 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
a16aeb36 | 638 | struct arp_pkt *arp = arp_pkt(skb); |
1da177e4 LT |
639 | struct slave *assigned_slave; |
640 | struct rlb_client_info *client_info; | |
641 | u32 hash_index = 0; | |
642 | ||
643 | _lock_rx_hashtbl(bond); | |
644 | ||
645 | hash_index = _simple_hash((u8 *)&arp->ip_dst, sizeof(arp->ip_src)); | |
646 | client_info = &(bond_info->rx_hashtbl[hash_index]); | |
647 | ||
648 | if (client_info->assigned) { | |
649 | if ((client_info->ip_src == arp->ip_src) && | |
650 | (client_info->ip_dst == arp->ip_dst)) { | |
651 | /* the entry is already assigned to this client */ | |
885a136c | 652 | if (compare_ether_addr_64bits(arp->mac_dst, mac_bcast)) { |
1da177e4 LT |
653 | /* update mac address from arp */ |
654 | memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN); | |
655 | } | |
656 | ||
657 | assigned_slave = client_info->slave; | |
658 | if (assigned_slave) { | |
659 | _unlock_rx_hashtbl(bond); | |
660 | return assigned_slave; | |
661 | } | |
662 | } else { | |
663 | /* the entry is already assigned to some other client, | |
664 | * move the old client to primary (curr_active_slave) so | |
665 | * that the new client can be assigned to this entry. | |
666 | */ | |
667 | if (bond->curr_active_slave && | |
668 | client_info->slave != bond->curr_active_slave) { | |
669 | client_info->slave = bond->curr_active_slave; | |
670 | rlb_update_client(client_info); | |
671 | } | |
672 | } | |
673 | } | |
674 | /* assign a new slave */ | |
675 | assigned_slave = rlb_next_rx_slave(bond); | |
676 | ||
677 | if (assigned_slave) { | |
678 | client_info->ip_src = arp->ip_src; | |
679 | client_info->ip_dst = arp->ip_dst; | |
680 | /* arp->mac_dst is broadcast for arp reqeusts. | |
681 | * will be updated with clients actual unicast mac address | |
682 | * upon receiving an arp reply. | |
683 | */ | |
684 | memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN); | |
685 | client_info->slave = assigned_slave; | |
686 | ||
885a136c | 687 | if (compare_ether_addr_64bits(client_info->mac_dst, mac_bcast)) { |
1da177e4 LT |
688 | client_info->ntt = 1; |
689 | bond->alb_info.rx_ntt = 1; | |
690 | } else { | |
691 | client_info->ntt = 0; | |
692 | } | |
693 | ||
694 | if (!list_empty(&bond->vlan_list)) { | |
966bc6f4 | 695 | if (!vlan_get_tag(skb, &client_info->vlan_id)) |
1da177e4 | 696 | client_info->tag = 1; |
1da177e4 LT |
697 | } |
698 | ||
699 | if (!client_info->assigned) { | |
700 | u32 prev_tbl_head = bond_info->rx_hashtbl_head; | |
701 | bond_info->rx_hashtbl_head = hash_index; | |
702 | client_info->next = prev_tbl_head; | |
703 | if (prev_tbl_head != RLB_NULL_INDEX) { | |
704 | bond_info->rx_hashtbl[prev_tbl_head].prev = | |
705 | hash_index; | |
706 | } | |
707 | client_info->assigned = 1; | |
708 | } | |
709 | } | |
710 | ||
711 | _unlock_rx_hashtbl(bond); | |
712 | ||
713 | return assigned_slave; | |
714 | } | |
715 | ||
716 | /* chooses (and returns) transmit channel for arp reply | |
717 | * does not choose channel for other arp types since they are | |
718 | * sent on the curr_active_slave | |
719 | */ | |
720 | static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond) | |
721 | { | |
a16aeb36 | 722 | struct arp_pkt *arp = arp_pkt(skb); |
1da177e4 LT |
723 | struct slave *tx_slave = NULL; |
724 | ||
f14c4e4e | 725 | if (arp->op_code == htons(ARPOP_REPLY)) { |
1da177e4 LT |
726 | /* the arp must be sent on the selected |
727 | * rx channel | |
728 | */ | |
729 | tx_slave = rlb_choose_channel(skb, bond); | |
730 | if (tx_slave) { | |
731 | memcpy(arp->mac_src,tx_slave->dev->dev_addr, ETH_ALEN); | |
732 | } | |
5a03cdb7 | 733 | pr_debug("Server sent ARP Reply packet\n"); |
f14c4e4e | 734 | } else if (arp->op_code == htons(ARPOP_REQUEST)) { |
1da177e4 LT |
735 | /* Create an entry in the rx_hashtbl for this client as a |
736 | * place holder. | |
737 | * When the arp reply is received the entry will be updated | |
738 | * with the correct unicast address of the client. | |
739 | */ | |
740 | rlb_choose_channel(skb, bond); | |
741 | ||
742 | /* The ARP relpy packets must be delayed so that | |
743 | * they can cancel out the influence of the ARP request. | |
744 | */ | |
745 | bond->alb_info.rlb_update_delay_counter = RLB_UPDATE_DELAY; | |
746 | ||
747 | /* arp requests are broadcast and are sent on the primary | |
748 | * the arp request will collapse all clients on the subnet to | |
749 | * the primary slave. We must register these clients to be | |
750 | * updated with their assigned mac. | |
751 | */ | |
752 | rlb_req_update_subnet_clients(bond, arp->ip_src); | |
5a03cdb7 | 753 | pr_debug("Server sent ARP Request packet\n"); |
1da177e4 LT |
754 | } |
755 | ||
756 | return tx_slave; | |
757 | } | |
758 | ||
759 | /* Caller must hold bond lock for read */ | |
760 | static void rlb_rebalance(struct bonding *bond) | |
761 | { | |
762 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
763 | struct slave *assigned_slave; | |
764 | struct rlb_client_info *client_info; | |
765 | int ntt; | |
766 | u32 hash_index; | |
767 | ||
768 | _lock_rx_hashtbl(bond); | |
769 | ||
770 | ntt = 0; | |
771 | hash_index = bond_info->rx_hashtbl_head; | |
772 | for (; hash_index != RLB_NULL_INDEX; hash_index = client_info->next) { | |
773 | client_info = &(bond_info->rx_hashtbl[hash_index]); | |
774 | assigned_slave = rlb_next_rx_slave(bond); | |
775 | if (assigned_slave && (client_info->slave != assigned_slave)) { | |
776 | client_info->slave = assigned_slave; | |
777 | client_info->ntt = 1; | |
778 | ntt = 1; | |
779 | } | |
780 | } | |
781 | ||
782 | /* update the team's flag only after the whole iteration */ | |
783 | if (ntt) { | |
784 | bond_info->rx_ntt = 1; | |
785 | } | |
786 | _unlock_rx_hashtbl(bond); | |
787 | } | |
788 | ||
789 | /* Caller must hold rx_hashtbl lock */ | |
790 | static void rlb_init_table_entry(struct rlb_client_info *entry) | |
791 | { | |
792 | memset(entry, 0, sizeof(struct rlb_client_info)); | |
793 | entry->next = RLB_NULL_INDEX; | |
794 | entry->prev = RLB_NULL_INDEX; | |
795 | } | |
796 | ||
797 | static int rlb_initialize(struct bonding *bond) | |
798 | { | |
799 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
800 | struct packet_type *pk_type = &(BOND_ALB_INFO(bond).rlb_pkt_type); | |
0d206a3a | 801 | struct rlb_client_info *new_hashtbl; |
1da177e4 LT |
802 | int size = RLB_HASH_TABLE_SIZE * sizeof(struct rlb_client_info); |
803 | int i; | |
804 | ||
805 | spin_lock_init(&(bond_info->rx_hashtbl_lock)); | |
806 | ||
0d206a3a MW |
807 | new_hashtbl = kmalloc(size, GFP_KERNEL); |
808 | if (!new_hashtbl) { | |
e5e2a8fd | 809 | pr_err(DRV_NAME |
4e0952c7 | 810 | ": %s: Error: Failed to allocate RLB hash table\n", |
1da177e4 | 811 | bond->dev->name); |
1da177e4 LT |
812 | return -1; |
813 | } | |
0d206a3a MW |
814 | _lock_rx_hashtbl(bond); |
815 | ||
816 | bond_info->rx_hashtbl = new_hashtbl; | |
1da177e4 LT |
817 | |
818 | bond_info->rx_hashtbl_head = RLB_NULL_INDEX; | |
819 | ||
820 | for (i = 0; i < RLB_HASH_TABLE_SIZE; i++) { | |
821 | rlb_init_table_entry(bond_info->rx_hashtbl + i); | |
822 | } | |
823 | ||
824 | _unlock_rx_hashtbl(bond); | |
825 | ||
826 | /*initialize packet type*/ | |
09640e63 | 827 | pk_type->type = cpu_to_be16(ETH_P_ARP); |
6146b1a4 | 828 | pk_type->dev = NULL; |
1da177e4 LT |
829 | pk_type->func = rlb_arp_recv; |
830 | ||
831 | /* register to receive ARPs */ | |
832 | dev_add_pack(pk_type); | |
833 | ||
834 | return 0; | |
835 | } | |
836 | ||
837 | static void rlb_deinitialize(struct bonding *bond) | |
838 | { | |
839 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
840 | ||
841 | dev_remove_pack(&(bond_info->rlb_pkt_type)); | |
842 | ||
843 | _lock_rx_hashtbl(bond); | |
844 | ||
845 | kfree(bond_info->rx_hashtbl); | |
846 | bond_info->rx_hashtbl = NULL; | |
847 | bond_info->rx_hashtbl_head = RLB_NULL_INDEX; | |
848 | ||
849 | _unlock_rx_hashtbl(bond); | |
850 | } | |
851 | ||
852 | static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id) | |
853 | { | |
854 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
855 | u32 curr_index; | |
856 | ||
857 | _lock_rx_hashtbl(bond); | |
858 | ||
859 | curr_index = bond_info->rx_hashtbl_head; | |
860 | while (curr_index != RLB_NULL_INDEX) { | |
861 | struct rlb_client_info *curr = &(bond_info->rx_hashtbl[curr_index]); | |
862 | u32 next_index = bond_info->rx_hashtbl[curr_index].next; | |
863 | u32 prev_index = bond_info->rx_hashtbl[curr_index].prev; | |
864 | ||
865 | if (curr->tag && (curr->vlan_id == vlan_id)) { | |
866 | if (curr_index == bond_info->rx_hashtbl_head) { | |
867 | bond_info->rx_hashtbl_head = next_index; | |
868 | } | |
869 | if (prev_index != RLB_NULL_INDEX) { | |
870 | bond_info->rx_hashtbl[prev_index].next = next_index; | |
871 | } | |
872 | if (next_index != RLB_NULL_INDEX) { | |
873 | bond_info->rx_hashtbl[next_index].prev = prev_index; | |
874 | } | |
875 | ||
876 | rlb_init_table_entry(curr); | |
877 | } | |
878 | ||
879 | curr_index = next_index; | |
880 | } | |
881 | ||
882 | _unlock_rx_hashtbl(bond); | |
883 | } | |
884 | ||
885 | /*********************** tlb/rlb shared functions *********************/ | |
886 | ||
887 | static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[]) | |
888 | { | |
889 | struct bonding *bond = bond_get_bond_by_slave(slave); | |
890 | struct learning_pkt pkt; | |
891 | int size = sizeof(struct learning_pkt); | |
892 | int i; | |
893 | ||
894 | memset(&pkt, 0, size); | |
895 | memcpy(pkt.mac_dst, mac_addr, ETH_ALEN); | |
896 | memcpy(pkt.mac_src, mac_addr, ETH_ALEN); | |
09640e63 | 897 | pkt.type = cpu_to_be16(ETH_P_LOOP); |
1da177e4 LT |
898 | |
899 | for (i = 0; i < MAX_LP_BURST; i++) { | |
900 | struct sk_buff *skb; | |
901 | char *data; | |
902 | ||
903 | skb = dev_alloc_skb(size); | |
904 | if (!skb) { | |
905 | return; | |
906 | } | |
907 | ||
908 | data = skb_put(skb, size); | |
909 | memcpy(data, &pkt, size); | |
910 | ||
459a98ed | 911 | skb_reset_mac_header(skb); |
b0e380b1 | 912 | skb->network_header = skb->mac_header + ETH_HLEN; |
1da177e4 LT |
913 | skb->protocol = pkt.type; |
914 | skb->priority = TC_PRIO_CONTROL; | |
915 | skb->dev = slave->dev; | |
916 | ||
917 | if (!list_empty(&bond->vlan_list)) { | |
918 | struct vlan_entry *vlan; | |
919 | ||
920 | vlan = bond_next_vlan(bond, | |
921 | bond->alb_info.current_alb_vlan); | |
922 | ||
923 | bond->alb_info.current_alb_vlan = vlan; | |
924 | if (!vlan) { | |
925 | kfree_skb(skb); | |
926 | continue; | |
927 | } | |
928 | ||
929 | skb = vlan_put_tag(skb, vlan->vlan_id); | |
930 | if (!skb) { | |
e5e2a8fd | 931 | pr_err(DRV_NAME |
4e0952c7 MW |
932 | ": %s: Error: failed to insert VLAN tag\n", |
933 | bond->dev->name); | |
1da177e4 LT |
934 | continue; |
935 | } | |
936 | } | |
937 | ||
938 | dev_queue_xmit(skb); | |
939 | } | |
940 | } | |
941 | ||
942 | /* hw is a boolean parameter that determines whether we should try and | |
943 | * set the hw address of the device as well as the hw address of the | |
944 | * net_device | |
945 | */ | |
946 | static int alb_set_slave_mac_addr(struct slave *slave, u8 addr[], int hw) | |
947 | { | |
948 | struct net_device *dev = slave->dev; | |
949 | struct sockaddr s_addr; | |
950 | ||
951 | if (!hw) { | |
952 | memcpy(dev->dev_addr, addr, dev->addr_len); | |
953 | return 0; | |
954 | } | |
955 | ||
956 | /* for rlb each slave must have a unique hw mac addresses so that */ | |
957 | /* each slave will receive packets destined to a different mac */ | |
958 | memcpy(s_addr.sa_data, addr, dev->addr_len); | |
959 | s_addr.sa_family = dev->type; | |
960 | if (dev_set_mac_address(dev, &s_addr)) { | |
e5e2a8fd | 961 | pr_err(DRV_NAME |
4e0952c7 | 962 | ": %s: Error: dev_set_mac_address of dev %s failed! ALB " |
1da177e4 LT |
963 | "mode requires that the base driver support setting " |
964 | "the hw address also when the network device's " | |
965 | "interface is open\n", | |
4e0952c7 | 966 | dev->master->name, dev->name); |
1da177e4 LT |
967 | return -EOPNOTSUPP; |
968 | } | |
969 | return 0; | |
970 | } | |
971 | ||
059fe7a5 JV |
972 | /* |
973 | * Swap MAC addresses between two slaves. | |
974 | * | |
975 | * Called with RTNL held, and no other locks. | |
976 | * | |
977 | */ | |
978 | ||
1da177e4 LT |
979 | static void alb_swap_mac_addr(struct bonding *bond, struct slave *slave1, struct slave *slave2) |
980 | { | |
1da177e4 | 981 | u8 tmp_mac_addr[ETH_ALEN]; |
1da177e4 LT |
982 | |
983 | memcpy(tmp_mac_addr, slave1->dev->dev_addr, ETH_ALEN); | |
984 | alb_set_slave_mac_addr(slave1, slave2->dev->dev_addr, bond->alb_info.rlb_enabled); | |
985 | alb_set_slave_mac_addr(slave2, tmp_mac_addr, bond->alb_info.rlb_enabled); | |
986 | ||
059fe7a5 JV |
987 | } |
988 | ||
989 | /* | |
990 | * Send learning packets after MAC address swap. | |
991 | * | |
2543331d | 992 | * Called with RTNL and no other locks |
059fe7a5 JV |
993 | */ |
994 | static void alb_fasten_mac_swap(struct bonding *bond, struct slave *slave1, | |
995 | struct slave *slave2) | |
996 | { | |
997 | int slaves_state_differ = (SLAVE_IS_OK(slave1) != SLAVE_IS_OK(slave2)); | |
998 | struct slave *disabled_slave = NULL; | |
999 | ||
2543331d JV |
1000 | ASSERT_RTNL(); |
1001 | ||
1da177e4 LT |
1002 | /* fasten the change in the switch */ |
1003 | if (SLAVE_IS_OK(slave1)) { | |
1004 | alb_send_learning_packets(slave1, slave1->dev->dev_addr); | |
1005 | if (bond->alb_info.rlb_enabled) { | |
1006 | /* inform the clients that the mac address | |
1007 | * has changed | |
1008 | */ | |
1009 | rlb_req_update_slave_clients(bond, slave1); | |
1010 | } | |
1011 | } else { | |
1012 | disabled_slave = slave1; | |
1013 | } | |
1014 | ||
1015 | if (SLAVE_IS_OK(slave2)) { | |
1016 | alb_send_learning_packets(slave2, slave2->dev->dev_addr); | |
1017 | if (bond->alb_info.rlb_enabled) { | |
1018 | /* inform the clients that the mac address | |
1019 | * has changed | |
1020 | */ | |
1021 | rlb_req_update_slave_clients(bond, slave2); | |
1022 | } | |
1023 | } else { | |
1024 | disabled_slave = slave2; | |
1025 | } | |
1026 | ||
1027 | if (bond->alb_info.rlb_enabled && slaves_state_differ) { | |
1028 | /* A disabled slave was assigned an active mac addr */ | |
1029 | rlb_teach_disabled_mac_on_primary(bond, | |
1030 | disabled_slave->dev->dev_addr); | |
1031 | } | |
1032 | } | |
1033 | ||
1034 | /** | |
1035 | * alb_change_hw_addr_on_detach | |
1036 | * @bond: bonding we're working on | |
1037 | * @slave: the slave that was just detached | |
1038 | * | |
1039 | * We assume that @slave was already detached from the slave list. | |
1040 | * | |
1041 | * If @slave's permanent hw address is different both from its current | |
1042 | * address and from @bond's address, then somewhere in the bond there's | |
1043 | * a slave that has @slave's permanet address as its current address. | |
1044 | * We'll make sure that that slave no longer uses @slave's permanent address. | |
1045 | * | |
2543331d | 1046 | * Caller must hold RTNL and no other locks |
1da177e4 LT |
1047 | */ |
1048 | static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *slave) | |
1049 | { | |
1050 | int perm_curr_diff; | |
1051 | int perm_bond_diff; | |
1052 | ||
885a136c ED |
1053 | perm_curr_diff = compare_ether_addr_64bits(slave->perm_hwaddr, |
1054 | slave->dev->dev_addr); | |
1055 | perm_bond_diff = compare_ether_addr_64bits(slave->perm_hwaddr, | |
1056 | bond->dev->dev_addr); | |
1da177e4 LT |
1057 | |
1058 | if (perm_curr_diff && perm_bond_diff) { | |
1059 | struct slave *tmp_slave; | |
1060 | int i, found = 0; | |
1061 | ||
1062 | bond_for_each_slave(bond, tmp_slave, i) { | |
885a136c ED |
1063 | if (!compare_ether_addr_64bits(slave->perm_hwaddr, |
1064 | tmp_slave->dev->dev_addr)) { | |
1da177e4 LT |
1065 | found = 1; |
1066 | break; | |
1067 | } | |
1068 | } | |
1069 | ||
1070 | if (found) { | |
059fe7a5 | 1071 | /* locking: needs RTNL and nothing else */ |
1da177e4 | 1072 | alb_swap_mac_addr(bond, slave, tmp_slave); |
059fe7a5 | 1073 | alb_fasten_mac_swap(bond, slave, tmp_slave); |
1da177e4 LT |
1074 | } |
1075 | } | |
1076 | } | |
1077 | ||
1078 | /** | |
1079 | * alb_handle_addr_collision_on_attach | |
1080 | * @bond: bonding we're working on | |
1081 | * @slave: the slave that was just attached | |
1082 | * | |
1083 | * checks uniqueness of slave's mac address and handles the case the | |
1084 | * new slave uses the bonds mac address. | |
1085 | * | |
1086 | * If the permanent hw address of @slave is @bond's hw address, we need to | |
1087 | * find a different hw address to give @slave, that isn't in use by any other | |
1088 | * slave in the bond. This address must be, of course, one of the premanent | |
1089 | * addresses of the other slaves. | |
1090 | * | |
1091 | * We go over the slave list, and for each slave there we compare its | |
1092 | * permanent hw address with the current address of all the other slaves. | |
1093 | * If no match was found, then we've found a slave with a permanent address | |
1094 | * that isn't used by any other slave in the bond, so we can assign it to | |
1095 | * @slave. | |
1096 | * | |
1097 | * assumption: this function is called before @slave is attached to the | |
1098 | * bond slave list. | |
1099 | * | |
1100 | * caller must hold the bond lock for write since the mac addresses are compared | |
1101 | * and may be swapped. | |
1102 | */ | |
1103 | static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slave *slave) | |
1104 | { | |
1105 | struct slave *tmp_slave1, *tmp_slave2, *free_mac_slave; | |
1106 | struct slave *has_bond_addr = bond->curr_active_slave; | |
1107 | int i, j, found = 0; | |
1108 | ||
1109 | if (bond->slave_cnt == 0) { | |
1110 | /* this is the first slave */ | |
1111 | return 0; | |
1112 | } | |
1113 | ||
1114 | /* if slave's mac address differs from bond's mac address | |
1115 | * check uniqueness of slave's mac address against the other | |
1116 | * slaves in the bond. | |
1117 | */ | |
885a136c | 1118 | if (compare_ether_addr_64bits(slave->perm_hwaddr, bond->dev->dev_addr)) { |
1da177e4 | 1119 | bond_for_each_slave(bond, tmp_slave1, i) { |
885a136c ED |
1120 | if (!compare_ether_addr_64bits(tmp_slave1->dev->dev_addr, |
1121 | slave->dev->dev_addr)) { | |
1da177e4 LT |
1122 | found = 1; |
1123 | break; | |
1124 | } | |
1125 | } | |
1126 | ||
6b38aefe JL |
1127 | if (!found) |
1128 | return 0; | |
1da177e4 | 1129 | |
6b38aefe JL |
1130 | /* Try setting slave mac to bond address and fall-through |
1131 | to code handling that situation below... */ | |
1132 | alb_set_slave_mac_addr(slave, bond->dev->dev_addr, | |
1133 | bond->alb_info.rlb_enabled); | |
1da177e4 LT |
1134 | } |
1135 | ||
1136 | /* The slave's address is equal to the address of the bond. | |
1137 | * Search for a spare address in the bond for this slave. | |
1138 | */ | |
1139 | free_mac_slave = NULL; | |
1140 | ||
1141 | bond_for_each_slave(bond, tmp_slave1, i) { | |
1142 | found = 0; | |
1143 | bond_for_each_slave(bond, tmp_slave2, j) { | |
885a136c ED |
1144 | if (!compare_ether_addr_64bits(tmp_slave1->perm_hwaddr, |
1145 | tmp_slave2->dev->dev_addr)) { | |
1da177e4 LT |
1146 | found = 1; |
1147 | break; | |
1148 | } | |
1149 | } | |
1150 | ||
1151 | if (!found) { | |
1152 | /* no slave has tmp_slave1's perm addr | |
1153 | * as its curr addr | |
1154 | */ | |
1155 | free_mac_slave = tmp_slave1; | |
1156 | break; | |
1157 | } | |
1158 | ||
1159 | if (!has_bond_addr) { | |
885a136c ED |
1160 | if (!compare_ether_addr_64bits(tmp_slave1->dev->dev_addr, |
1161 | bond->dev->dev_addr)) { | |
1da177e4 LT |
1162 | |
1163 | has_bond_addr = tmp_slave1; | |
1164 | } | |
1165 | } | |
1166 | } | |
1167 | ||
1168 | if (free_mac_slave) { | |
1169 | alb_set_slave_mac_addr(slave, free_mac_slave->perm_hwaddr, | |
1170 | bond->alb_info.rlb_enabled); | |
1171 | ||
e5e2a8fd JP |
1172 | pr_warning(DRV_NAME |
1173 | ": %s: Warning: the hw address of slave %s is " | |
1174 | "in use by the bond; giving it the hw address " | |
1175 | "of %s\n", | |
1176 | bond->dev->name, slave->dev->name, | |
1177 | free_mac_slave->dev->name); | |
1da177e4 LT |
1178 | |
1179 | } else if (has_bond_addr) { | |
e5e2a8fd | 1180 | pr_err(DRV_NAME |
4e0952c7 | 1181 | ": %s: Error: the hw address of slave %s is in use by the " |
1da177e4 LT |
1182 | "bond; couldn't find a slave with a free hw address to " |
1183 | "give it (this should not have happened)\n", | |
4e0952c7 | 1184 | bond->dev->name, slave->dev->name); |
1da177e4 LT |
1185 | return -EFAULT; |
1186 | } | |
1187 | ||
1188 | return 0; | |
1189 | } | |
1190 | ||
1191 | /** | |
1192 | * alb_set_mac_address | |
1193 | * @bond: | |
1194 | * @addr: | |
1195 | * | |
1196 | * In TLB mode all slaves are configured to the bond's hw address, but set | |
1197 | * their dev_addr field to different addresses (based on their permanent hw | |
1198 | * addresses). | |
1199 | * | |
1200 | * For each slave, this function sets the interface to the new address and then | |
1201 | * changes its dev_addr field to its previous value. | |
1202 | * | |
1203 | * Unwinding assumes bond's mac address has not yet changed. | |
1204 | */ | |
1205 | static int alb_set_mac_address(struct bonding *bond, void *addr) | |
1206 | { | |
1207 | struct sockaddr sa; | |
1208 | struct slave *slave, *stop_at; | |
1209 | char tmp_addr[ETH_ALEN]; | |
1210 | int res; | |
1211 | int i; | |
1212 | ||
1213 | if (bond->alb_info.rlb_enabled) { | |
1214 | return 0; | |
1215 | } | |
1216 | ||
1217 | bond_for_each_slave(bond, slave, i) { | |
1da177e4 LT |
1218 | /* save net_device's current hw address */ |
1219 | memcpy(tmp_addr, slave->dev->dev_addr, ETH_ALEN); | |
1220 | ||
1221 | res = dev_set_mac_address(slave->dev, addr); | |
1222 | ||
1223 | /* restore net_device's hw address */ | |
1224 | memcpy(slave->dev->dev_addr, tmp_addr, ETH_ALEN); | |
1225 | ||
eb7cc59a | 1226 | if (res) |
1da177e4 | 1227 | goto unwind; |
1da177e4 LT |
1228 | } |
1229 | ||
1230 | return 0; | |
1231 | ||
1232 | unwind: | |
1233 | memcpy(sa.sa_data, bond->dev->dev_addr, bond->dev->addr_len); | |
1234 | sa.sa_family = bond->dev->type; | |
1235 | ||
1236 | /* unwind from head to the slave that failed */ | |
1237 | stop_at = slave; | |
1238 | bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) { | |
1239 | memcpy(tmp_addr, slave->dev->dev_addr, ETH_ALEN); | |
1240 | dev_set_mac_address(slave->dev, &sa); | |
1241 | memcpy(slave->dev->dev_addr, tmp_addr, ETH_ALEN); | |
1242 | } | |
1243 | ||
1244 | return res; | |
1245 | } | |
1246 | ||
1247 | /************************ exported alb funcions ************************/ | |
1248 | ||
1249 | int bond_alb_initialize(struct bonding *bond, int rlb_enabled) | |
1250 | { | |
1251 | int res; | |
1252 | ||
1253 | res = tlb_initialize(bond); | |
1254 | if (res) { | |
1255 | return res; | |
1256 | } | |
1257 | ||
1258 | if (rlb_enabled) { | |
1259 | bond->alb_info.rlb_enabled = 1; | |
1260 | /* initialize rlb */ | |
1261 | res = rlb_initialize(bond); | |
1262 | if (res) { | |
1263 | tlb_deinitialize(bond); | |
1264 | return res; | |
1265 | } | |
b76850ab MW |
1266 | } else { |
1267 | bond->alb_info.rlb_enabled = 0; | |
1da177e4 LT |
1268 | } |
1269 | ||
1270 | return 0; | |
1271 | } | |
1272 | ||
1273 | void bond_alb_deinitialize(struct bonding *bond) | |
1274 | { | |
1275 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1276 | ||
1277 | tlb_deinitialize(bond); | |
1278 | ||
1279 | if (bond_info->rlb_enabled) { | |
1280 | rlb_deinitialize(bond); | |
1281 | } | |
1282 | } | |
1283 | ||
1284 | int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev) | |
1285 | { | |
454d7c9b | 1286 | struct bonding *bond = netdev_priv(bond_dev); |
1da177e4 LT |
1287 | struct ethhdr *eth_data; |
1288 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1289 | struct slave *tx_slave = NULL; | |
d3bb52b0 | 1290 | static const __be32 ip_bcast = htonl(0xffffffff); |
1da177e4 LT |
1291 | int hash_size = 0; |
1292 | int do_tx_balance = 1; | |
1293 | u32 hash_index = 0; | |
eddc9ec5 | 1294 | const u8 *hash_start = NULL; |
1da177e4 | 1295 | int res = 1; |
2d1ea19d | 1296 | struct ipv6hdr *ip6hdr; |
1da177e4 | 1297 | |
459a98ed | 1298 | skb_reset_mac_header(skb); |
1da177e4 LT |
1299 | eth_data = eth_hdr(skb); |
1300 | ||
1301 | /* make sure that the curr_active_slave and the slaves list do | |
1302 | * not change during tx | |
1303 | */ | |
1304 | read_lock(&bond->lock); | |
1305 | read_lock(&bond->curr_slave_lock); | |
1306 | ||
1307 | if (!BOND_IS_OK(bond)) { | |
1308 | goto out; | |
1309 | } | |
1310 | ||
1311 | switch (ntohs(skb->protocol)) { | |
eddc9ec5 ACM |
1312 | case ETH_P_IP: { |
1313 | const struct iphdr *iph = ip_hdr(skb); | |
1314 | ||
885a136c | 1315 | if (!compare_ether_addr_64bits(eth_data->h_dest, mac_bcast) || |
eddc9ec5 ACM |
1316 | (iph->daddr == ip_bcast) || |
1317 | (iph->protocol == IPPROTO_IGMP)) { | |
1da177e4 LT |
1318 | do_tx_balance = 0; |
1319 | break; | |
1320 | } | |
eddc9ec5 ACM |
1321 | hash_start = (char *)&(iph->daddr); |
1322 | hash_size = sizeof(iph->daddr); | |
1323 | } | |
1da177e4 LT |
1324 | break; |
1325 | case ETH_P_IPV6: | |
2d1ea19d VY |
1326 | /* IPv6 doesn't really use broadcast mac address, but leave |
1327 | * that here just in case. | |
1328 | */ | |
885a136c | 1329 | if (!compare_ether_addr_64bits(eth_data->h_dest, mac_bcast)) { |
1da177e4 LT |
1330 | do_tx_balance = 0; |
1331 | break; | |
2d1ea19d VY |
1332 | } |
1333 | ||
1334 | /* IPv6 uses all-nodes multicast as an equivalent to | |
1335 | * broadcasts in IPv4. | |
1336 | */ | |
885a136c | 1337 | if (!compare_ether_addr_64bits(eth_data->h_dest, mac_v6_allmcast)) { |
2d1ea19d VY |
1338 | do_tx_balance = 0; |
1339 | break; | |
1340 | } | |
1341 | ||
1342 | /* Additianally, DAD probes should not be tx-balanced as that | |
1343 | * will lead to false positives for duplicate addresses and | |
1344 | * prevent address configuration from working. | |
1345 | */ | |
1346 | ip6hdr = ipv6_hdr(skb); | |
1347 | if (ipv6_addr_any(&ip6hdr->saddr)) { | |
1348 | do_tx_balance = 0; | |
1349 | break; | |
1da177e4 LT |
1350 | } |
1351 | ||
0660e03f ACM |
1352 | hash_start = (char *)&(ipv6_hdr(skb)->daddr); |
1353 | hash_size = sizeof(ipv6_hdr(skb)->daddr); | |
1da177e4 LT |
1354 | break; |
1355 | case ETH_P_IPX: | |
d3bb52b0 | 1356 | if (ipx_hdr(skb)->ipx_checksum != IPX_NO_CHECKSUM) { |
1da177e4 LT |
1357 | /* something is wrong with this packet */ |
1358 | do_tx_balance = 0; | |
1359 | break; | |
1360 | } | |
1361 | ||
1362 | if (ipx_hdr(skb)->ipx_type != IPX_TYPE_NCP) { | |
1363 | /* The only protocol worth balancing in | |
1364 | * this family since it has an "ARP" like | |
1365 | * mechanism | |
1366 | */ | |
1367 | do_tx_balance = 0; | |
1368 | break; | |
1369 | } | |
1370 | ||
1371 | hash_start = (char*)eth_data->h_dest; | |
1372 | hash_size = ETH_ALEN; | |
1373 | break; | |
1374 | case ETH_P_ARP: | |
1375 | do_tx_balance = 0; | |
1376 | if (bond_info->rlb_enabled) { | |
1377 | tx_slave = rlb_arp_xmit(skb, bond); | |
1378 | } | |
1379 | break; | |
1380 | default: | |
1381 | do_tx_balance = 0; | |
1382 | break; | |
1383 | } | |
1384 | ||
1385 | if (do_tx_balance) { | |
1386 | hash_index = _simple_hash(hash_start, hash_size); | |
1387 | tx_slave = tlb_choose_channel(bond, hash_index, skb->len); | |
1388 | } | |
1389 | ||
1390 | if (!tx_slave) { | |
1391 | /* unbalanced or unassigned, send through primary */ | |
1392 | tx_slave = bond->curr_active_slave; | |
1393 | bond_info->unbalanced_load += skb->len; | |
1394 | } | |
1395 | ||
1396 | if (tx_slave && SLAVE_IS_OK(tx_slave)) { | |
1397 | if (tx_slave != bond->curr_active_slave) { | |
1398 | memcpy(eth_data->h_source, | |
1399 | tx_slave->dev->dev_addr, | |
1400 | ETH_ALEN); | |
1401 | } | |
1402 | ||
1403 | res = bond_dev_queue_xmit(bond, skb, tx_slave->dev); | |
1404 | } else { | |
1405 | if (tx_slave) { | |
1406 | tlb_clear_slave(bond, tx_slave, 0); | |
1407 | } | |
1408 | } | |
1409 | ||
1410 | out: | |
1411 | if (res) { | |
1412 | /* no suitable interface, frame not sent */ | |
1413 | dev_kfree_skb(skb); | |
1414 | } | |
1415 | read_unlock(&bond->curr_slave_lock); | |
1416 | read_unlock(&bond->lock); | |
ec634fe3 | 1417 | return NETDEV_TX_OK; |
1da177e4 LT |
1418 | } |
1419 | ||
1b76b316 | 1420 | void bond_alb_monitor(struct work_struct *work) |
1da177e4 | 1421 | { |
1b76b316 JV |
1422 | struct bonding *bond = container_of(work, struct bonding, |
1423 | alb_work.work); | |
1da177e4 LT |
1424 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); |
1425 | struct slave *slave; | |
1426 | int i; | |
1427 | ||
1428 | read_lock(&bond->lock); | |
1429 | ||
1430 | if (bond->kill_timers) { | |
1431 | goto out; | |
1432 | } | |
1433 | ||
1434 | if (bond->slave_cnt == 0) { | |
1435 | bond_info->tx_rebalance_counter = 0; | |
1436 | bond_info->lp_counter = 0; | |
1437 | goto re_arm; | |
1438 | } | |
1439 | ||
1440 | bond_info->tx_rebalance_counter++; | |
1441 | bond_info->lp_counter++; | |
1442 | ||
1443 | /* send learning packets */ | |
1444 | if (bond_info->lp_counter >= BOND_ALB_LP_TICKS) { | |
1445 | /* change of curr_active_slave involves swapping of mac addresses. | |
1446 | * in order to avoid this swapping from happening while | |
1447 | * sending the learning packets, the curr_slave_lock must be held for | |
1448 | * read. | |
1449 | */ | |
1450 | read_lock(&bond->curr_slave_lock); | |
1451 | ||
1452 | bond_for_each_slave(bond, slave, i) { | |
e944ef79 | 1453 | alb_send_learning_packets(slave, slave->dev->dev_addr); |
1da177e4 LT |
1454 | } |
1455 | ||
1456 | read_unlock(&bond->curr_slave_lock); | |
1457 | ||
1458 | bond_info->lp_counter = 0; | |
1459 | } | |
1460 | ||
1461 | /* rebalance tx traffic */ | |
1462 | if (bond_info->tx_rebalance_counter >= BOND_TLB_REBALANCE_TICKS) { | |
1463 | ||
1464 | read_lock(&bond->curr_slave_lock); | |
1465 | ||
1466 | bond_for_each_slave(bond, slave, i) { | |
1467 | tlb_clear_slave(bond, slave, 1); | |
1468 | if (slave == bond->curr_active_slave) { | |
1469 | SLAVE_TLB_INFO(slave).load = | |
1470 | bond_info->unbalanced_load / | |
1471 | BOND_TLB_REBALANCE_INTERVAL; | |
1472 | bond_info->unbalanced_load = 0; | |
1473 | } | |
1474 | } | |
1475 | ||
1476 | read_unlock(&bond->curr_slave_lock); | |
1477 | ||
1478 | bond_info->tx_rebalance_counter = 0; | |
1479 | } | |
1480 | ||
1481 | /* handle rlb stuff */ | |
1482 | if (bond_info->rlb_enabled) { | |
1da177e4 LT |
1483 | if (bond_info->primary_is_promisc && |
1484 | (++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) { | |
1485 | ||
d0e81b7e JV |
1486 | /* |
1487 | * dev_set_promiscuity requires rtnl and | |
1488 | * nothing else. | |
1489 | */ | |
1490 | read_unlock(&bond->lock); | |
1491 | rtnl_lock(); | |
1492 | ||
1da177e4 LT |
1493 | bond_info->rlb_promisc_timeout_counter = 0; |
1494 | ||
1495 | /* If the primary was set to promiscuous mode | |
1496 | * because a slave was disabled then | |
1497 | * it can now leave promiscuous mode. | |
1498 | */ | |
1499 | dev_set_promiscuity(bond->curr_active_slave->dev, -1); | |
1500 | bond_info->primary_is_promisc = 0; | |
1da177e4 | 1501 | |
d0e81b7e JV |
1502 | rtnl_unlock(); |
1503 | read_lock(&bond->lock); | |
1504 | } | |
1da177e4 LT |
1505 | |
1506 | if (bond_info->rlb_rebalance) { | |
1507 | bond_info->rlb_rebalance = 0; | |
1508 | rlb_rebalance(bond); | |
1509 | } | |
1510 | ||
1511 | /* check if clients need updating */ | |
1512 | if (bond_info->rx_ntt) { | |
1513 | if (bond_info->rlb_update_delay_counter) { | |
1514 | --bond_info->rlb_update_delay_counter; | |
1515 | } else { | |
1516 | rlb_update_rx_clients(bond); | |
1517 | if (bond_info->rlb_update_retry_counter) { | |
1518 | --bond_info->rlb_update_retry_counter; | |
1519 | } else { | |
1520 | bond_info->rx_ntt = 0; | |
1521 | } | |
1522 | } | |
1523 | } | |
1524 | } | |
1525 | ||
1526 | re_arm: | |
1b76b316 | 1527 | queue_delayed_work(bond->wq, &bond->alb_work, alb_delta_in_ticks); |
1da177e4 LT |
1528 | out: |
1529 | read_unlock(&bond->lock); | |
1530 | } | |
1531 | ||
1532 | /* assumption: called before the slave is attached to the bond | |
1533 | * and not locked by the bond lock | |
1534 | */ | |
1535 | int bond_alb_init_slave(struct bonding *bond, struct slave *slave) | |
1536 | { | |
1537 | int res; | |
1538 | ||
1539 | res = alb_set_slave_mac_addr(slave, slave->perm_hwaddr, | |
1540 | bond->alb_info.rlb_enabled); | |
1541 | if (res) { | |
1542 | return res; | |
1543 | } | |
1544 | ||
1545 | /* caller must hold the bond lock for write since the mac addresses | |
1546 | * are compared and may be swapped. | |
1547 | */ | |
6603a6f2 | 1548 | read_lock(&bond->lock); |
1da177e4 LT |
1549 | |
1550 | res = alb_handle_addr_collision_on_attach(bond, slave); | |
1551 | ||
6603a6f2 | 1552 | read_unlock(&bond->lock); |
1da177e4 LT |
1553 | |
1554 | if (res) { | |
1555 | return res; | |
1556 | } | |
1557 | ||
1558 | tlb_init_slave(slave); | |
1559 | ||
1560 | /* order a rebalance ASAP */ | |
1561 | bond->alb_info.tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS; | |
1562 | ||
1563 | if (bond->alb_info.rlb_enabled) { | |
1564 | bond->alb_info.rlb_rebalance = 1; | |
1565 | } | |
1566 | ||
1567 | return 0; | |
1568 | } | |
1569 | ||
2543331d JV |
1570 | /* |
1571 | * Remove slave from tlb and rlb hash tables, and fix up MAC addresses | |
1572 | * if necessary. | |
1573 | * | |
1574 | * Caller must hold RTNL and no other locks | |
1575 | */ | |
1da177e4 LT |
1576 | void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave) |
1577 | { | |
1578 | if (bond->slave_cnt > 1) { | |
1579 | alb_change_hw_addr_on_detach(bond, slave); | |
1580 | } | |
1581 | ||
1582 | tlb_clear_slave(bond, slave, 0); | |
1583 | ||
1584 | if (bond->alb_info.rlb_enabled) { | |
1585 | bond->alb_info.next_rx_slave = NULL; | |
1586 | rlb_clear_slave(bond, slave); | |
1587 | } | |
1588 | } | |
1589 | ||
1590 | /* Caller must hold bond lock for read */ | |
1591 | void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link) | |
1592 | { | |
1593 | struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); | |
1594 | ||
1595 | if (link == BOND_LINK_DOWN) { | |
1596 | tlb_clear_slave(bond, slave, 0); | |
1597 | if (bond->alb_info.rlb_enabled) { | |
1598 | rlb_clear_slave(bond, slave); | |
1599 | } | |
1600 | } else if (link == BOND_LINK_UP) { | |
1601 | /* order a rebalance ASAP */ | |
1602 | bond_info->tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS; | |
1603 | if (bond->alb_info.rlb_enabled) { | |
1604 | bond->alb_info.rlb_rebalance = 1; | |
1605 | /* If the updelay module parameter is smaller than the | |
1606 | * forwarding delay of the switch the rebalance will | |
1607 | * not work because the rebalance arp replies will | |
1608 | * not be forwarded to the clients.. | |
1609 | */ | |
1610 | } | |
1611 | } | |
1612 | } | |
1613 | ||
1614 | /** | |
1615 | * bond_alb_handle_active_change - assign new curr_active_slave | |
1616 | * @bond: our bonding struct | |
1617 | * @new_slave: new slave to assign | |
1618 | * | |
1619 | * Set the bond->curr_active_slave to @new_slave and handle | |
1620 | * mac address swapping and promiscuity changes as needed. | |
1621 | * | |
059fe7a5 JV |
1622 | * If new_slave is NULL, caller must hold curr_slave_lock or |
1623 | * bond->lock for write. | |
1624 | * | |
1625 | * If new_slave is not NULL, caller must hold RTNL, bond->lock for | |
1626 | * read and curr_slave_lock for write. Processing here may sleep, so | |
1627 | * no other locks may be held. | |
1da177e4 LT |
1628 | */ |
1629 | void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave) | |
1f78d9f9 HE |
1630 | __releases(&bond->curr_slave_lock) |
1631 | __releases(&bond->lock) | |
1632 | __acquires(&bond->lock) | |
1633 | __acquires(&bond->curr_slave_lock) | |
1da177e4 LT |
1634 | { |
1635 | struct slave *swap_slave; | |
1636 | int i; | |
1637 | ||
1638 | if (bond->curr_active_slave == new_slave) { | |
1639 | return; | |
1640 | } | |
1641 | ||
1642 | if (bond->curr_active_slave && bond->alb_info.primary_is_promisc) { | |
1643 | dev_set_promiscuity(bond->curr_active_slave->dev, -1); | |
1644 | bond->alb_info.primary_is_promisc = 0; | |
1645 | bond->alb_info.rlb_promisc_timeout_counter = 0; | |
1646 | } | |
1647 | ||
1648 | swap_slave = bond->curr_active_slave; | |
1649 | bond->curr_active_slave = new_slave; | |
1650 | ||
1651 | if (!new_slave || (bond->slave_cnt == 0)) { | |
1652 | return; | |
1653 | } | |
1654 | ||
1655 | /* set the new curr_active_slave to the bonds mac address | |
1656 | * i.e. swap mac addresses of old curr_active_slave and new curr_active_slave | |
1657 | */ | |
1658 | if (!swap_slave) { | |
1659 | struct slave *tmp_slave; | |
1660 | /* find slave that is holding the bond's mac address */ | |
1661 | bond_for_each_slave(bond, tmp_slave, i) { | |
885a136c ED |
1662 | if (!compare_ether_addr_64bits(tmp_slave->dev->dev_addr, |
1663 | bond->dev->dev_addr)) { | |
1da177e4 LT |
1664 | swap_slave = tmp_slave; |
1665 | break; | |
1666 | } | |
1667 | } | |
1668 | } | |
1669 | ||
059fe7a5 JV |
1670 | /* |
1671 | * Arrange for swap_slave and new_slave to temporarily be | |
1672 | * ignored so we can mess with their MAC addresses without | |
1673 | * fear of interference from transmit activity. | |
1674 | */ | |
1675 | if (swap_slave) { | |
1676 | tlb_clear_slave(bond, swap_slave, 1); | |
1677 | } | |
1678 | tlb_clear_slave(bond, new_slave, 1); | |
1679 | ||
1680 | write_unlock_bh(&bond->curr_slave_lock); | |
1681 | read_unlock(&bond->lock); | |
1682 | ||
e0138a66 JV |
1683 | ASSERT_RTNL(); |
1684 | ||
1da177e4 LT |
1685 | /* curr_active_slave must be set before calling alb_swap_mac_addr */ |
1686 | if (swap_slave) { | |
1687 | /* swap mac address */ | |
1688 | alb_swap_mac_addr(bond, swap_slave, new_slave); | |
1689 | } else { | |
1690 | /* set the new_slave to the bond mac address */ | |
1691 | alb_set_slave_mac_addr(new_slave, bond->dev->dev_addr, | |
1692 | bond->alb_info.rlb_enabled); | |
059fe7a5 JV |
1693 | } |
1694 | ||
059fe7a5 JV |
1695 | if (swap_slave) { |
1696 | alb_fasten_mac_swap(bond, swap_slave, new_slave); | |
2543331d | 1697 | read_lock(&bond->lock); |
059fe7a5 | 1698 | } else { |
2543331d | 1699 | read_lock(&bond->lock); |
1da177e4 LT |
1700 | alb_send_learning_packets(new_slave, bond->dev->dev_addr); |
1701 | } | |
059fe7a5 JV |
1702 | |
1703 | write_lock_bh(&bond->curr_slave_lock); | |
1da177e4 LT |
1704 | } |
1705 | ||
059fe7a5 JV |
1706 | /* |
1707 | * Called with RTNL | |
1708 | */ | |
1da177e4 | 1709 | int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr) |
1f78d9f9 | 1710 | __acquires(&bond->lock) |
815bcc27 | 1711 | __releases(&bond->lock) |
1da177e4 | 1712 | { |
454d7c9b | 1713 | struct bonding *bond = netdev_priv(bond_dev); |
1da177e4 LT |
1714 | struct sockaddr *sa = addr; |
1715 | struct slave *slave, *swap_slave; | |
1716 | int res; | |
1717 | int i; | |
1718 | ||
1719 | if (!is_valid_ether_addr(sa->sa_data)) { | |
1720 | return -EADDRNOTAVAIL; | |
1721 | } | |
1722 | ||
1723 | res = alb_set_mac_address(bond, addr); | |
1724 | if (res) { | |
1725 | return res; | |
1726 | } | |
1727 | ||
1728 | memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len); | |
1729 | ||
1730 | /* If there is no curr_active_slave there is nothing else to do. | |
1731 | * Otherwise we'll need to pass the new address to it and handle | |
1732 | * duplications. | |
1733 | */ | |
1734 | if (!bond->curr_active_slave) { | |
1735 | return 0; | |
1736 | } | |
1737 | ||
1738 | swap_slave = NULL; | |
1739 | ||
1740 | bond_for_each_slave(bond, slave, i) { | |
885a136c ED |
1741 | if (!compare_ether_addr_64bits(slave->dev->dev_addr, |
1742 | bond_dev->dev_addr)) { | |
1da177e4 LT |
1743 | swap_slave = slave; |
1744 | break; | |
1745 | } | |
1746 | } | |
1747 | ||
1748 | if (swap_slave) { | |
1749 | alb_swap_mac_addr(bond, swap_slave, bond->curr_active_slave); | |
059fe7a5 | 1750 | alb_fasten_mac_swap(bond, swap_slave, bond->curr_active_slave); |
1da177e4 LT |
1751 | } else { |
1752 | alb_set_slave_mac_addr(bond->curr_active_slave, bond_dev->dev_addr, | |
1753 | bond->alb_info.rlb_enabled); | |
1754 | ||
815bcc27 | 1755 | read_lock(&bond->lock); |
1da177e4 LT |
1756 | alb_send_learning_packets(bond->curr_active_slave, bond_dev->dev_addr); |
1757 | if (bond->alb_info.rlb_enabled) { | |
1758 | /* inform clients mac address has changed */ | |
1759 | rlb_req_update_slave_clients(bond, bond->curr_active_slave); | |
1760 | } | |
815bcc27 | 1761 | read_unlock(&bond->lock); |
1da177e4 LT |
1762 | } |
1763 | ||
1764 | return 0; | |
1765 | } | |
1766 | ||
1767 | void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id) | |
1768 | { | |
1769 | if (bond->alb_info.current_alb_vlan && | |
1770 | (bond->alb_info.current_alb_vlan->vlan_id == vlan_id)) { | |
1771 | bond->alb_info.current_alb_vlan = NULL; | |
1772 | } | |
1773 | ||
1774 | if (bond->alb_info.rlb_enabled) { | |
1775 | rlb_clear_vlan(bond, vlan_id); | |
1776 | } | |
1777 | } | |
1778 |