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f620b43a | 1 | /* |
09a5d390 | 2 | * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013 Nicira, Inc. |
f620b43a BP |
3 | * |
4 | * Licensed under the Apache License, Version 2.0 (the "License"); | |
5 | * you may not use this file except in compliance with the License. | |
6 | * You may obtain a copy of the License at: | |
7 | * | |
8 | * http://www.apache.org/licenses/LICENSE-2.0 | |
9 | * | |
10 | * Unless required by applicable law or agreed to in writing, software | |
11 | * distributed under the License is distributed on an "AS IS" BASIS, | |
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
13 | * See the License for the specific language governing permissions and | |
14 | * limitations under the License. | |
15 | */ | |
16 | ||
17 | #include <config.h> | |
18 | ||
19 | #include "bond.h" | |
20 | ||
21 | #include <limits.h> | |
22 | #include <stdint.h> | |
23 | #include <stdlib.h> | |
75fad143 | 24 | #include <math.h> |
f620b43a BP |
25 | |
26 | #include "coverage.h" | |
27 | #include "dynamic-string.h" | |
28 | #include "flow.h" | |
29 | #include "hmap.h" | |
bdebeece | 30 | #include "lacp.h" |
f620b43a BP |
31 | #include "list.h" |
32 | #include "netdev.h" | |
33 | #include "odp-util.h" | |
34 | #include "ofpbuf.h" | |
35 | #include "packets.h" | |
36 | #include "poll-loop.h" | |
fc1d4f01 | 37 | #include "shash.h" |
f620b43a BP |
38 | #include "tag.h" |
39 | #include "timeval.h" | |
40 | #include "unixctl.h" | |
41 | #include "vlog.h" | |
42 | ||
43 | VLOG_DEFINE_THIS_MODULE(bond); | |
44 | ||
f620b43a BP |
45 | /* Bit-mask for hashing a flow down to a bucket. |
46 | * There are (BOND_MASK + 1) buckets. */ | |
47 | #define BOND_MASK 0xff | |
48 | ||
49 | /* A hash bucket for mapping a flow to a slave. | |
50 | * "struct bond" has an array of (BOND_MASK + 1) of these. */ | |
51 | struct bond_entry { | |
52 | struct bond_slave *slave; /* Assigned slave, NULL if unassigned. */ | |
53 | uint64_t tx_bytes; /* Count of bytes recently transmitted. */ | |
5dd165d3 | 54 | tag_type tag; /* Tag for entry<->facet association. */ |
f620b43a BP |
55 | struct list list_node; /* In bond_slave's 'entries' list. */ |
56 | }; | |
57 | ||
58 | /* A bond slave, that is, one of the links comprising a bond. */ | |
59 | struct bond_slave { | |
60 | struct hmap_node hmap_node; /* In struct bond's slaves hmap. */ | |
61 | struct bond *bond; /* The bond that contains this slave. */ | |
62 | void *aux; /* Client-provided handle for this slave. */ | |
63 | ||
64 | struct netdev *netdev; /* Network device, owned by the client. */ | |
1ea24138 | 65 | unsigned int change_seq; /* Tracks changes in 'netdev'. */ |
f620b43a BP |
66 | char *name; /* Name (a copy of netdev_get_name(netdev)). */ |
67 | ||
68 | /* Link status. */ | |
69 | long long delay_expires; /* Time after which 'enabled' may change. */ | |
f620b43a | 70 | bool enabled; /* May be chosen for flows? */ |
296f6519 | 71 | bool may_enable; /* Client considers this slave bondable. */ |
f620b43a BP |
72 | tag_type tag; /* Tag associated with this slave. */ |
73 | ||
74 | /* Rebalancing info. Used only by bond_rebalance(). */ | |
75 | struct list bal_node; /* In bond_rebalance()'s 'bals' list. */ | |
76 | struct list entries; /* 'struct bond_entry's assigned here. */ | |
77 | uint64_t tx_bytes; /* Sum across 'tx_bytes' of entries. */ | |
78 | }; | |
79 | ||
80 | /* A bond, that is, a set of network devices grouped to improve performance or | |
81 | * robustness. */ | |
82 | struct bond { | |
83 | struct hmap_node hmap_node; /* In 'all_bonds' hmap. */ | |
84 | char *name; /* Name provided by client. */ | |
85 | ||
86 | /* Slaves. */ | |
87 | struct hmap slaves; | |
88 | ||
89 | /* Bonding info. */ | |
90 | enum bond_mode balance; /* Balancing mode, one of BM_*. */ | |
91 | struct bond_slave *active_slave; | |
92 | tag_type no_slaves_tag; /* Tag for flows when all slaves disabled. */ | |
93 | int updelay, downdelay; /* Delay before slave goes up/down, in ms. */ | |
bdebeece | 94 | enum lacp_status lacp_status; /* Status of LACP negotiations. */ |
62904702 | 95 | bool bond_revalidate; /* True if flows need revalidation. */ |
672d18b2 | 96 | uint32_t basis; /* Basis for flow hash function. */ |
f620b43a BP |
97 | |
98 | /* SLB specific bonding info. */ | |
99 | struct bond_entry *hash; /* An array of (BOND_MASK + 1) elements. */ | |
100 | int rebalance_interval; /* Interval between rebalances, in ms. */ | |
101 | long long int next_rebalance; /* Next rebalancing time. */ | |
102 | bool send_learning_packets; | |
103 | ||
f620b43a BP |
104 | /* Legacy compatibility. */ |
105 | long long int next_fake_iface_update; /* LLONG_MAX if disabled. */ | |
106 | ||
107 | /* Tag set saved for next bond_run(). This tag set is a kluge for cases | |
108 | * where we can't otherwise provide revalidation feedback to the client. | |
109 | * That's only unixctl commands now; I hope no other cases will arise. */ | |
110 | struct tag_set unixctl_tags; | |
111 | }; | |
112 | ||
113 | static struct hmap all_bonds = HMAP_INITIALIZER(&all_bonds); | |
114 | ||
95aafb2a | 115 | static void bond_entry_reset(struct bond *); |
f620b43a | 116 | static struct bond_slave *bond_slave_lookup(struct bond *, const void *slave_); |
f620b43a BP |
117 | static void bond_enable_slave(struct bond_slave *, bool enable, |
118 | struct tag_set *); | |
119 | static void bond_link_status_update(struct bond_slave *, struct tag_set *); | |
120 | static void bond_choose_active_slave(struct bond *, struct tag_set *); | |
f620b43a | 121 | static unsigned int bond_hash_src(const uint8_t mac[ETH_ADDR_LEN], |
672d18b2 EJ |
122 | uint16_t vlan, uint32_t basis); |
123 | static unsigned int bond_hash_tcp(const struct flow *, uint16_t vlan, | |
124 | uint32_t basis); | |
f620b43a BP |
125 | static struct bond_entry *lookup_bond_entry(const struct bond *, |
126 | const struct flow *, | |
127 | uint16_t vlan); | |
128 | static tag_type bond_get_active_slave_tag(const struct bond *); | |
129 | static struct bond_slave *choose_output_slave(const struct bond *, | |
130 | const struct flow *, | |
bcd2633a | 131 | struct flow_wildcards *, |
00ed8314 | 132 | uint16_t vlan, tag_type *tags); |
f620b43a BP |
133 | static void bond_update_fake_slave_stats(struct bond *); |
134 | ||
135 | /* Attempts to parse 's' as the name of a bond balancing mode. If successful, | |
136 | * stores the mode in '*balance' and returns true. Otherwise returns false | |
137 | * without modifying '*balance'. */ | |
138 | bool | |
139 | bond_mode_from_string(enum bond_mode *balance, const char *s) | |
140 | { | |
141 | if (!strcmp(s, bond_mode_to_string(BM_TCP))) { | |
142 | *balance = BM_TCP; | |
143 | } else if (!strcmp(s, bond_mode_to_string(BM_SLB))) { | |
144 | *balance = BM_SLB; | |
145 | } else if (!strcmp(s, bond_mode_to_string(BM_AB))) { | |
146 | *balance = BM_AB; | |
147 | } else { | |
148 | return false; | |
149 | } | |
150 | return true; | |
151 | } | |
152 | ||
153 | /* Returns a string representing 'balance'. */ | |
154 | const char * | |
155 | bond_mode_to_string(enum bond_mode balance) { | |
156 | switch (balance) { | |
157 | case BM_TCP: | |
158 | return "balance-tcp"; | |
159 | case BM_SLB: | |
160 | return "balance-slb"; | |
161 | case BM_AB: | |
162 | return "active-backup"; | |
163 | } | |
164 | NOT_REACHED(); | |
165 | } | |
166 | ||
f620b43a BP |
167 | \f |
168 | /* Creates and returns a new bond whose configuration is initially taken from | |
169 | * 's'. | |
170 | * | |
171 | * The caller should register each slave on the new bond by calling | |
172 | * bond_slave_register(). */ | |
173 | struct bond * | |
174 | bond_create(const struct bond_settings *s) | |
175 | { | |
176 | struct bond *bond; | |
177 | ||
178 | bond = xzalloc(sizeof *bond); | |
179 | hmap_init(&bond->slaves); | |
180 | bond->no_slaves_tag = tag_create_random(); | |
f620b43a BP |
181 | bond->next_fake_iface_update = LLONG_MAX; |
182 | ||
183 | bond_reconfigure(bond, s); | |
184 | ||
185 | tag_set_init(&bond->unixctl_tags); | |
186 | ||
187 | return bond; | |
188 | } | |
189 | ||
190 | /* Frees 'bond'. */ | |
191 | void | |
192 | bond_destroy(struct bond *bond) | |
193 | { | |
194 | struct bond_slave *slave, *next_slave; | |
195 | ||
196 | if (!bond) { | |
197 | return; | |
198 | } | |
199 | ||
200 | hmap_remove(&all_bonds, &bond->hmap_node); | |
201 | ||
202 | HMAP_FOR_EACH_SAFE (slave, next_slave, hmap_node, &bond->slaves) { | |
203 | hmap_remove(&bond->slaves, &slave->hmap_node); | |
204 | /* Client owns 'slave->netdev'. */ | |
205 | free(slave->name); | |
206 | free(slave); | |
207 | } | |
208 | hmap_destroy(&bond->slaves); | |
209 | ||
210 | free(bond->hash); | |
f620b43a BP |
211 | free(bond->name); |
212 | free(bond); | |
213 | } | |
214 | ||
215 | /* Updates 'bond''s overall configuration to 's'. | |
216 | * | |
217 | * The caller should register each slave on 'bond' by calling | |
218 | * bond_slave_register(). This is optional if none of the slaves' | |
4d6fb5eb | 219 | * configuration has changed. In any case it can't hurt. |
59d7b2b6 EJ |
220 | * |
221 | * Returns true if the configuration has changed in such a way that requires | |
222 | * flow revalidation. | |
223 | * */ | |
224 | bool | |
f620b43a BP |
225 | bond_reconfigure(struct bond *bond, const struct bond_settings *s) |
226 | { | |
59d7b2b6 EJ |
227 | bool revalidate = false; |
228 | ||
f620b43a BP |
229 | if (!bond->name || strcmp(bond->name, s->name)) { |
230 | if (bond->name) { | |
231 | hmap_remove(&all_bonds, &bond->hmap_node); | |
232 | free(bond->name); | |
233 | } | |
234 | bond->name = xstrdup(s->name); | |
235 | hmap_insert(&all_bonds, &bond->hmap_node, hash_string(bond->name, 0)); | |
236 | } | |
237 | ||
f620b43a BP |
238 | bond->updelay = s->up_delay; |
239 | bond->downdelay = s->down_delay; | |
bc1b010c EJ |
240 | |
241 | if (bond->rebalance_interval != s->rebalance_interval) { | |
242 | bond->rebalance_interval = s->rebalance_interval; | |
243 | revalidate = true; | |
244 | } | |
f620b43a | 245 | |
59d7b2b6 EJ |
246 | if (bond->balance != s->balance) { |
247 | bond->balance = s->balance; | |
248 | revalidate = true; | |
249 | } | |
250 | ||
672d18b2 EJ |
251 | if (bond->basis != s->basis) { |
252 | bond->basis = s->basis; | |
253 | revalidate = true; | |
254 | } | |
255 | ||
f620b43a BP |
256 | if (s->fake_iface) { |
257 | if (bond->next_fake_iface_update == LLONG_MAX) { | |
258 | bond->next_fake_iface_update = time_msec(); | |
259 | } | |
260 | } else { | |
261 | bond->next_fake_iface_update = LLONG_MAX; | |
262 | } | |
59d7b2b6 | 263 | |
62904702 EJ |
264 | if (bond->bond_revalidate) { |
265 | revalidate = true; | |
266 | bond->bond_revalidate = false; | |
267 | } | |
268 | ||
95aafb2a EJ |
269 | if (bond->balance == BM_AB || !bond->hash || revalidate) { |
270 | bond_entry_reset(bond); | |
271 | } | |
272 | ||
59d7b2b6 | 273 | return revalidate; |
f620b43a BP |
274 | } |
275 | ||
f8ddccd2 | 276 | static void |
1ea24138 | 277 | bond_slave_set_netdev__(struct bond_slave *slave, struct netdev *netdev) |
f8ddccd2 BP |
278 | { |
279 | if (slave->netdev != netdev) { | |
f8ddccd2 | 280 | slave->netdev = netdev; |
1ea24138 | 281 | slave->change_seq = 0; |
f8ddccd2 BP |
282 | } |
283 | } | |
284 | ||
f620b43a BP |
285 | /* Registers 'slave_' as a slave of 'bond'. The 'slave_' pointer is an |
286 | * arbitrary client-provided pointer that uniquely identifies a slave within a | |
287 | * bond. If 'slave_' already exists within 'bond' then this function | |
288 | * reconfigures the existing slave. | |
289 | * | |
290 | * 'netdev' must be the network device that 'slave_' represents. It is owned | |
291 | * by the client, so the client must not close it before either unregistering | |
292 | * 'slave_' or destroying 'bond'. | |
4d6fb5eb | 293 | */ |
f620b43a | 294 | void |
df53d41c | 295 | bond_slave_register(struct bond *bond, void *slave_, struct netdev *netdev) |
f620b43a BP |
296 | { |
297 | struct bond_slave *slave = bond_slave_lookup(bond, slave_); | |
298 | ||
299 | if (!slave) { | |
300 | slave = xzalloc(sizeof *slave); | |
301 | ||
302 | hmap_insert(&bond->slaves, &slave->hmap_node, hash_pointer(slave_, 0)); | |
303 | slave->bond = bond; | |
304 | slave->aux = slave_; | |
305 | slave->delay_expires = LLONG_MAX; | |
244b2160 | 306 | slave->name = xstrdup(netdev_get_name(netdev)); |
7321e30e | 307 | bond->bond_revalidate = true; |
244b2160 | 308 | |
b3c18f66 | 309 | slave->enabled = false; |
c8544aa1 | 310 | bond_enable_slave(slave, netdev_get_carrier(netdev), NULL); |
f620b43a BP |
311 | } |
312 | ||
1ea24138 | 313 | bond_slave_set_netdev__(slave, netdev); |
a6934aa9 | 314 | |
f620b43a BP |
315 | free(slave->name); |
316 | slave->name = xstrdup(netdev_get_name(netdev)); | |
f620b43a BP |
317 | } |
318 | ||
f8ddccd2 BP |
319 | /* Updates the network device to be used with 'slave_' to 'netdev'. |
320 | * | |
321 | * This is useful if the caller closes and re-opens the network device | |
322 | * registered with bond_slave_register() but doesn't need to change anything | |
323 | * else. */ | |
324 | void | |
325 | bond_slave_set_netdev(struct bond *bond, void *slave_, struct netdev *netdev) | |
326 | { | |
327 | struct bond_slave *slave = bond_slave_lookup(bond, slave_); | |
328 | if (slave) { | |
1ea24138 | 329 | bond_slave_set_netdev__(slave, netdev); |
f8ddccd2 BP |
330 | } |
331 | } | |
332 | ||
f620b43a BP |
333 | /* Unregisters 'slave_' from 'bond'. If 'bond' does not contain such a slave |
334 | * then this function has no effect. | |
335 | * | |
336 | * Unregistering a slave invalidates all flows. */ | |
337 | void | |
338 | bond_slave_unregister(struct bond *bond, const void *slave_) | |
339 | { | |
340 | struct bond_slave *slave = bond_slave_lookup(bond, slave_); | |
341 | bool del_active; | |
342 | ||
343 | if (!slave) { | |
344 | return; | |
345 | } | |
346 | ||
b3c18f66 EJ |
347 | bond_enable_slave(slave, false, NULL); |
348 | ||
f620b43a BP |
349 | del_active = bond->active_slave == slave; |
350 | if (bond->hash) { | |
351 | struct bond_entry *e; | |
352 | for (e = bond->hash; e <= &bond->hash[BOND_MASK]; e++) { | |
353 | if (e->slave == slave) { | |
354 | e->slave = NULL; | |
355 | } | |
356 | } | |
357 | } | |
358 | ||
359 | free(slave->name); | |
360 | ||
361 | hmap_remove(&bond->slaves, &slave->hmap_node); | |
362 | /* Client owns 'slave->netdev'. */ | |
363 | free(slave); | |
364 | ||
365 | if (del_active) { | |
366 | struct tag_set tags; | |
367 | ||
368 | tag_set_init(&tags); | |
369 | bond_choose_active_slave(bond, &tags); | |
370 | bond->send_learning_packets = true; | |
371 | } | |
372 | } | |
373 | ||
296f6519 EJ |
374 | /* Should be called on each slave in 'bond' before bond_run() to indicate |
375 | * whether or not 'slave_' may be enabled. This function is intended to allow | |
376 | * other protocols to have some impact on bonding decisions. For example LACP | |
377 | * or high level link monitoring protocols may decide that a given slave should | |
378 | * not be able to send traffic. */ | |
4d6fb5eb | 379 | void |
296f6519 | 380 | bond_slave_set_may_enable(struct bond *bond, void *slave_, bool may_enable) |
4d6fb5eb | 381 | { |
296f6519 | 382 | bond_slave_lookup(bond, slave_)->may_enable = may_enable; |
4d6fb5eb EJ |
383 | } |
384 | ||
f620b43a BP |
385 | /* Performs periodic maintenance on 'bond'. The caller must provide 'tags' to |
386 | * allow tagged flows to be invalidated. | |
387 | * | |
388 | * The caller should check bond_should_send_learning_packets() afterward. */ | |
389 | void | |
bdebeece | 390 | bond_run(struct bond *bond, struct tag_set *tags, enum lacp_status lacp_status) |
f620b43a BP |
391 | { |
392 | struct bond_slave *slave; | |
393 | ||
bdebeece EJ |
394 | if (bond->lacp_status != lacp_status) { |
395 | bond->lacp_status = lacp_status; | |
4592d0e2 EJ |
396 | bond->bond_revalidate = true; |
397 | } | |
4d6fb5eb | 398 | |
f620b43a BP |
399 | /* Enable slaves based on link status and LACP feedback. */ |
400 | HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) { | |
401 | bond_link_status_update(slave, tags); | |
1ea24138 | 402 | slave->change_seq = netdev_change_seq(slave->netdev); |
f620b43a BP |
403 | } |
404 | if (!bond->active_slave || !bond->active_slave->enabled) { | |
405 | bond_choose_active_slave(bond, tags); | |
406 | } | |
407 | ||
408 | /* Update fake bond interface stats. */ | |
409 | if (time_msec() >= bond->next_fake_iface_update) { | |
410 | bond_update_fake_slave_stats(bond); | |
411 | bond->next_fake_iface_update = time_msec() + 1000; | |
412 | } | |
413 | ||
62904702 | 414 | if (bond->bond_revalidate) { |
df53d41c | 415 | struct bond_slave *slave; |
dc9908b3 | 416 | |
df53d41c | 417 | bond->bond_revalidate = false; |
95aafb2a | 418 | bond_entry_reset(bond); |
df53d41c EJ |
419 | HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) { |
420 | tag_set_add(tags, slave->tag); | |
dc9908b3 | 421 | } |
0008fbcb | 422 | tag_set_add(tags, bond->no_slaves_tag); |
dc9908b3 EJ |
423 | } |
424 | ||
f620b43a BP |
425 | /* Invalidate any tags required by */ |
426 | tag_set_union(tags, &bond->unixctl_tags); | |
427 | tag_set_init(&bond->unixctl_tags); | |
428 | } | |
429 | ||
430 | /* Causes poll_block() to wake up when 'bond' needs something to be done. */ | |
431 | void | |
432 | bond_wait(struct bond *bond) | |
433 | { | |
434 | struct bond_slave *slave; | |
435 | ||
f620b43a BP |
436 | HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) { |
437 | if (slave->delay_expires != LLONG_MAX) { | |
438 | poll_timer_wait_until(slave->delay_expires); | |
439 | } | |
1ea24138 EJ |
440 | |
441 | if (slave->change_seq != netdev_change_seq(slave->netdev)) { | |
442 | poll_immediate_wake(); | |
443 | } | |
f620b43a BP |
444 | } |
445 | ||
446 | if (bond->next_fake_iface_update != LLONG_MAX) { | |
447 | poll_timer_wait_until(bond->next_fake_iface_update); | |
448 | } | |
449 | ||
450 | /* Ensure that any saved tags get revalidated right away. */ | |
451 | if (!tag_set_is_empty(&bond->unixctl_tags)) { | |
452 | poll_immediate_wake(); | |
453 | } | |
454 | ||
455 | /* We don't wait for bond->next_rebalance because rebalancing can only run | |
456 | * at a flow account checkpoint. ofproto does checkpointing on its own | |
457 | * schedule and bond_rebalance() gets called afterward, so we'd just be | |
458 | * waking up for no purpose. */ | |
459 | } | |
460 | \f | |
461 | /* MAC learning table interaction. */ | |
462 | ||
463 | static bool | |
464 | may_send_learning_packets(const struct bond *bond) | |
465 | { | |
bdebeece | 466 | return bond->lacp_status == LACP_DISABLED |
64e2748d | 467 | && (bond->balance == BM_SLB || bond->balance == BM_AB) |
bdebeece | 468 | && bond->active_slave; |
f620b43a BP |
469 | } |
470 | ||
471 | /* Returns true if 'bond' needs the client to send out packets to assist with | |
472 | * MAC learning on 'bond'. If this function returns true, then the client | |
473 | * should iterate through its MAC learning table for the bridge on which 'bond' | |
474 | * is located. For each MAC that has been learned on a port other than 'bond', | |
ea131871 | 475 | * it should call bond_compose_learning_packet(). |
f620b43a | 476 | * |
477879ea BP |
477 | * This function will only return true if 'bond' is in SLB or active-backup |
478 | * mode and LACP is not negotiated. Otherwise sending learning packets isn't | |
479 | * necessary. | |
f620b43a BP |
480 | * |
481 | * Calling this function resets the state that it checks. */ | |
482 | bool | |
483 | bond_should_send_learning_packets(struct bond *bond) | |
484 | { | |
485 | bool send = bond->send_learning_packets && may_send_learning_packets(bond); | |
486 | bond->send_learning_packets = false; | |
487 | return send; | |
488 | } | |
489 | ||
490 | /* Sends a gratuitous learning packet on 'bond' from 'eth_src' on 'vlan'. | |
491 | * | |
ea131871 JG |
492 | * See bond_should_send_learning_packets() for description of usage. The |
493 | * caller should send the composed packet on the port associated with | |
494 | * port_aux and takes ownership of the returned ofpbuf. */ | |
495 | struct ofpbuf * | |
496 | bond_compose_learning_packet(struct bond *bond, | |
497 | const uint8_t eth_src[ETH_ADDR_LEN], | |
498 | uint16_t vlan, void **port_aux) | |
f620b43a BP |
499 | { |
500 | struct bond_slave *slave; | |
ea131871 | 501 | struct ofpbuf *packet; |
00ed8314 | 502 | tag_type tags = 0; |
f620b43a | 503 | struct flow flow; |
f620b43a | 504 | |
cb22974d | 505 | ovs_assert(may_send_learning_packets(bond)); |
f620b43a BP |
506 | |
507 | memset(&flow, 0, sizeof flow); | |
508 | memcpy(flow.dl_src, eth_src, ETH_ADDR_LEN); | |
bcd2633a | 509 | slave = choose_output_slave(bond, &flow, NULL, vlan, &tags); |
f620b43a | 510 | |
ea131871 | 511 | packet = ofpbuf_new(0); |
2ea838ac | 512 | compose_rarp(packet, eth_src); |
f620b43a | 513 | if (vlan) { |
ea131871 | 514 | eth_push_vlan(packet, htons(vlan)); |
f620b43a | 515 | } |
f620b43a | 516 | |
ea131871 JG |
517 | *port_aux = slave->aux; |
518 | return packet; | |
f620b43a BP |
519 | } |
520 | \f | |
521 | /* Checks whether a packet that arrived on 'slave_' within 'bond', with an | |
522 | * Ethernet destination address of 'eth_dst', should be admitted. | |
523 | * | |
524 | * The return value is one of the following: | |
525 | * | |
526 | * - BV_ACCEPT: Admit the packet. | |
527 | * | |
528 | * - BV_DROP: Drop the packet. | |
529 | * | |
530 | * - BV_DROP_IF_MOVED: Consult the MAC learning table for the packet's | |
531 | * Ethernet source address and VLAN. If there is none, or if the packet | |
532 | * is on the learned port, then admit the packet. If a different port has | |
533 | * been learned, however, drop the packet (and do not use it for MAC | |
534 | * learning). | |
535 | */ | |
536 | enum bond_verdict | |
537 | bond_check_admissibility(struct bond *bond, const void *slave_, | |
538 | const uint8_t eth_dst[ETH_ADDR_LEN], tag_type *tags) | |
539 | { | |
9a1c6450 EJ |
540 | struct bond_slave *slave = bond_slave_lookup(bond, slave_); |
541 | ||
542 | /* LACP bonds have very loose admissibility restrictions because we can | |
543 | * assume the remote switch is aware of the bond and will "do the right | |
544 | * thing". However, as a precaution we drop packets on disabled slaves | |
545 | * because no correctly implemented partner switch should be sending | |
bdebeece EJ |
546 | * packets to them. |
547 | * | |
548 | * If LACP is configured, but LACP negotiations have been unsuccessful, we | |
549 | * drop all incoming traffic. */ | |
550 | switch (bond->lacp_status) { | |
551 | case LACP_NEGOTIATED: return slave->enabled ? BV_ACCEPT : BV_DROP; | |
552 | case LACP_CONFIGURED: return BV_DROP; | |
553 | case LACP_DISABLED: break; | |
f620b43a BP |
554 | } |
555 | ||
556 | /* Drop all multicast packets on inactive slaves. */ | |
557 | if (eth_addr_is_multicast(eth_dst)) { | |
558 | *tags |= bond_get_active_slave_tag(bond); | |
559 | if (bond->active_slave != bond_slave_lookup(bond, slave_)) { | |
560 | return BV_DROP; | |
561 | } | |
562 | } | |
563 | ||
f931a4c9 BP |
564 | switch (bond->balance) { |
565 | case BM_AB: | |
566 | /* Drop all packets which arrive on backup slaves. This is similar to | |
567 | * how Linux bonding handles active-backup bonds. */ | |
7ba7dcf0 EJ |
568 | *tags |= bond_get_active_slave_tag(bond); |
569 | if (bond->active_slave != slave) { | |
570 | static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5); | |
571 | ||
e6b2255c BP |
572 | VLOG_DBG_RL(&rl, "active-backup bond received packet on backup" |
573 | " slave (%s) destined for " ETH_ADDR_FMT, | |
574 | slave->name, ETH_ADDR_ARGS(eth_dst)); | |
7ba7dcf0 EJ |
575 | return BV_DROP; |
576 | } | |
f931a4c9 BP |
577 | return BV_ACCEPT; |
578 | ||
579 | case BM_TCP: | |
bdebeece EJ |
580 | /* TCP balanced bonds require successful LACP negotiated. Based on the |
581 | * above check, LACP is off on this bond. Therfore, we drop all | |
582 | * incoming traffic. */ | |
583 | return BV_DROP; | |
584 | ||
f931a4c9 BP |
585 | case BM_SLB: |
586 | /* Drop all packets for which we have learned a different input port, | |
587 | * because we probably sent the packet on one slave and got it back on | |
588 | * the other. Gratuitous ARP packets are an exception to this rule: | |
589 | * the host has moved to another switch. The exception to the | |
590 | * exception is if we locked the learning table to avoid reflections on | |
591 | * bond slaves. */ | |
592 | return BV_DROP_IF_MOVED; | |
7ba7dcf0 EJ |
593 | } |
594 | ||
f931a4c9 | 595 | NOT_REACHED(); |
f620b43a BP |
596 | } |
597 | ||
598 | /* Returns the slave (registered on 'bond' by bond_slave_register()) to which | |
599 | * a packet with the given 'flow' and 'vlan' should be forwarded. Returns | |
600 | * NULL if the packet should be dropped because no slaves are enabled. | |
601 | * | |
602 | * 'vlan' is not necessarily the same as 'flow->vlan_tci'. First, 'vlan' | |
603 | * should be a VID only (i.e. excluding the PCP bits). Second, | |
604 | * 'flow->vlan_tci' is the VLAN TCI that appeared on the packet (so it will be | |
605 | * nonzero only for trunk ports), whereas 'vlan' is the logical VLAN that the | |
606 | * packet belongs to (so for an access port it will be the access port's VLAN). | |
607 | * | |
608 | * Adds a tag to '*tags' that associates the flow with the returned slave. | |
bcd2633a JP |
609 | * |
610 | * If 'wc' is non-NULL, bitwise-OR's 'wc' with the set of bits that were | |
611 | * significant in the selection. At some point earlier, 'wc' should | |
612 | * have been initialized (e.g., by flow_wildcards_init_catchall()). | |
f620b43a BP |
613 | */ |
614 | void * | |
615 | bond_choose_output_slave(struct bond *bond, const struct flow *flow, | |
bcd2633a JP |
616 | struct flow_wildcards *wc, uint16_t vlan, |
617 | tag_type *tags) | |
f620b43a | 618 | { |
bcd2633a | 619 | struct bond_slave *slave = choose_output_slave(bond, flow, wc, vlan, tags); |
f620b43a | 620 | if (slave) { |
df53d41c | 621 | *tags |= slave->tag; |
f620b43a BP |
622 | return slave->aux; |
623 | } else { | |
624 | *tags |= bond->no_slaves_tag; | |
625 | return NULL; | |
626 | } | |
627 | } | |
f620b43a BP |
628 | \f |
629 | /* Rebalancing. */ | |
630 | ||
1b137691 EJ |
631 | static bool |
632 | bond_is_balanced(const struct bond *bond) | |
633 | { | |
bc1b010c EJ |
634 | return bond->rebalance_interval |
635 | && (bond->balance == BM_SLB || bond->balance == BM_TCP); | |
1b137691 EJ |
636 | } |
637 | ||
f620b43a BP |
638 | /* Notifies 'bond' that 'n_bytes' bytes were sent in 'flow' within 'vlan'. */ |
639 | void | |
640 | bond_account(struct bond *bond, const struct flow *flow, uint16_t vlan, | |
641 | uint64_t n_bytes) | |
642 | { | |
1b137691 | 643 | if (bond_is_balanced(bond)) { |
f620b43a | 644 | lookup_bond_entry(bond, flow, vlan)->tx_bytes += n_bytes; |
f620b43a BP |
645 | } |
646 | } | |
647 | ||
648 | static struct bond_slave * | |
649 | bond_slave_from_bal_node(struct list *bal) | |
650 | { | |
651 | return CONTAINER_OF(bal, struct bond_slave, bal_node); | |
652 | } | |
653 | ||
654 | static void | |
655 | log_bals(struct bond *bond, const struct list *bals) | |
656 | { | |
657 | if (VLOG_IS_DBG_ENABLED()) { | |
658 | struct ds ds = DS_EMPTY_INITIALIZER; | |
659 | const struct bond_slave *slave; | |
660 | ||
661 | LIST_FOR_EACH (slave, bal_node, bals) { | |
662 | if (ds.length) { | |
663 | ds_put_char(&ds, ','); | |
664 | } | |
665 | ds_put_format(&ds, " %s %"PRIu64"kB", | |
666 | slave->name, slave->tx_bytes / 1024); | |
667 | ||
668 | if (!slave->enabled) { | |
669 | ds_put_cstr(&ds, " (disabled)"); | |
670 | } | |
671 | if (!list_is_empty(&slave->entries)) { | |
672 | struct bond_entry *e; | |
673 | ||
674 | ds_put_cstr(&ds, " ("); | |
675 | LIST_FOR_EACH (e, list_node, &slave->entries) { | |
676 | if (&e->list_node != list_front(&slave->entries)) { | |
677 | ds_put_cstr(&ds, " + "); | |
678 | } | |
679 | ds_put_format(&ds, "h%td: %"PRIu64"kB", | |
680 | e - bond->hash, e->tx_bytes / 1024); | |
681 | } | |
682 | ds_put_cstr(&ds, ")"); | |
683 | } | |
684 | } | |
685 | VLOG_DBG("bond %s:%s", bond->name, ds_cstr(&ds)); | |
686 | ds_destroy(&ds); | |
687 | } | |
688 | } | |
689 | ||
690 | /* Shifts 'hash' from its current slave to 'to'. */ | |
691 | static void | |
692 | bond_shift_load(struct bond_entry *hash, struct bond_slave *to, | |
693 | struct tag_set *set) | |
694 | { | |
695 | struct bond_slave *from = hash->slave; | |
696 | struct bond *bond = from->bond; | |
697 | uint64_t delta = hash->tx_bytes; | |
698 | ||
699 | VLOG_INFO("bond %s: shift %"PRIu64"kB of load (with hash %td) " | |
700 | "from %s to %s (now carrying %"PRIu64"kB and " | |
701 | "%"PRIu64"kB load, respectively)", | |
702 | bond->name, delta / 1024, hash - bond->hash, | |
703 | from->name, to->name, | |
704 | (from->tx_bytes - delta) / 1024, | |
705 | (to->tx_bytes + delta) / 1024); | |
706 | ||
707 | /* Shift load away from 'from' to 'to'. */ | |
708 | from->tx_bytes -= delta; | |
709 | to->tx_bytes += delta; | |
710 | ||
711 | /* Arrange for flows to be revalidated. */ | |
712 | tag_set_add(set, hash->tag); | |
713 | hash->slave = to; | |
714 | hash->tag = tag_create_random(); | |
715 | } | |
716 | ||
09a5d390 BP |
717 | /* Picks and returns a bond_entry to migrate from 'from' (the most heavily |
718 | * loaded bond slave) to a bond slave that has 'to_tx_bytes' bytes of load, | |
f620b43a BP |
719 | * given that doing so must decrease the ratio of the load on the two slaves by |
720 | * at least 0.1. Returns NULL if there is no appropriate entry. | |
721 | * | |
722 | * The list of entries isn't sorted. I don't know of a reason to prefer to | |
723 | * shift away small hashes or large hashes. */ | |
724 | static struct bond_entry * | |
725 | choose_entry_to_migrate(const struct bond_slave *from, uint64_t to_tx_bytes) | |
726 | { | |
727 | struct bond_entry *e; | |
728 | ||
729 | if (list_is_short(&from->entries)) { | |
730 | /* 'from' carries no more than one MAC hash, so shifting load away from | |
731 | * it would be pointless. */ | |
732 | return NULL; | |
733 | } | |
734 | ||
735 | LIST_FOR_EACH (e, list_node, &from->entries) { | |
736 | double old_ratio, new_ratio; | |
737 | uint64_t delta; | |
738 | ||
739 | if (to_tx_bytes == 0) { | |
740 | /* Nothing on the new slave, move it. */ | |
741 | return e; | |
742 | } | |
743 | ||
744 | delta = e->tx_bytes; | |
745 | old_ratio = (double)from->tx_bytes / to_tx_bytes; | |
746 | new_ratio = (double)(from->tx_bytes - delta) / (to_tx_bytes + delta); | |
75fad143 ZK |
747 | if (old_ratio - new_ratio > 0.1 |
748 | && fabs(new_ratio - 1.0) < fabs(old_ratio - 1.0)) { | |
749 | /* We're aiming for an ideal ratio of 1, meaning both the 'from' | |
750 | and 'to' slave have the same load. Therefore, we only move an | |
751 | entry if it decreases the load on 'from', and brings us closer | |
752 | to equal traffic load. */ | |
f620b43a BP |
753 | return e; |
754 | } | |
755 | } | |
756 | ||
757 | return NULL; | |
758 | } | |
759 | ||
760 | /* Inserts 'slave' into 'bals' so that descending order of 'tx_bytes' is | |
761 | * maintained. */ | |
762 | static void | |
763 | insert_bal(struct list *bals, struct bond_slave *slave) | |
764 | { | |
765 | struct bond_slave *pos; | |
766 | ||
767 | LIST_FOR_EACH (pos, bal_node, bals) { | |
768 | if (slave->tx_bytes > pos->tx_bytes) { | |
769 | break; | |
770 | } | |
771 | } | |
772 | list_insert(&pos->bal_node, &slave->bal_node); | |
773 | } | |
774 | ||
775 | /* Removes 'slave' from its current list and then inserts it into 'bals' so | |
776 | * that descending order of 'tx_bytes' is maintained. */ | |
777 | static void | |
778 | reinsert_bal(struct list *bals, struct bond_slave *slave) | |
779 | { | |
780 | list_remove(&slave->bal_node); | |
781 | insert_bal(bals, slave); | |
782 | } | |
783 | ||
784 | /* If 'bond' needs rebalancing, does so. | |
785 | * | |
786 | * The caller should have called bond_account() for each active flow, to ensure | |
787 | * that flow data is consistently accounted at this point. */ | |
788 | void | |
789 | bond_rebalance(struct bond *bond, struct tag_set *tags) | |
790 | { | |
791 | struct bond_slave *slave; | |
792 | struct bond_entry *e; | |
793 | struct list bals; | |
794 | ||
1b137691 | 795 | if (!bond_is_balanced(bond) || time_msec() < bond->next_rebalance) { |
f620b43a BP |
796 | return; |
797 | } | |
798 | bond->next_rebalance = time_msec() + bond->rebalance_interval; | |
799 | ||
800 | /* Add each bond_entry to its slave's 'entries' list. | |
801 | * Compute each slave's tx_bytes as the sum of its entries' tx_bytes. */ | |
802 | HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) { | |
803 | slave->tx_bytes = 0; | |
804 | list_init(&slave->entries); | |
805 | } | |
806 | for (e = &bond->hash[0]; e <= &bond->hash[BOND_MASK]; e++) { | |
807 | if (e->slave && e->tx_bytes) { | |
808 | e->slave->tx_bytes += e->tx_bytes; | |
809 | list_push_back(&e->slave->entries, &e->list_node); | |
810 | } | |
811 | } | |
812 | ||
813 | /* Add enabled slaves to 'bals' in descending order of tx_bytes. | |
814 | * | |
815 | * XXX This is O(n**2) in the number of slaves but it could be O(n lg n) | |
816 | * with a proper list sort algorithm. */ | |
817 | list_init(&bals); | |
818 | HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) { | |
819 | if (slave->enabled) { | |
820 | insert_bal(&bals, slave); | |
821 | } | |
822 | } | |
823 | log_bals(bond, &bals); | |
824 | ||
825 | /* Shift load from the most-loaded slaves to the least-loaded slaves. */ | |
826 | while (!list_is_short(&bals)) { | |
827 | struct bond_slave *from = bond_slave_from_bal_node(list_front(&bals)); | |
828 | struct bond_slave *to = bond_slave_from_bal_node(list_back(&bals)); | |
829 | uint64_t overload; | |
830 | ||
831 | overload = from->tx_bytes - to->tx_bytes; | |
832 | if (overload < to->tx_bytes >> 5 || overload < 100000) { | |
833 | /* The extra load on 'from' (and all less-loaded slaves), compared | |
834 | * to that of 'to' (the least-loaded slave), is less than ~3%, or | |
835 | * it is less than ~1Mbps. No point in rebalancing. */ | |
836 | break; | |
837 | } | |
838 | ||
09a5d390 BP |
839 | /* 'from' is carrying significantly more load than 'to'. Pick a hash |
840 | * to move from 'from' to 'to'. */ | |
f620b43a BP |
841 | e = choose_entry_to_migrate(from, to->tx_bytes); |
842 | if (e) { | |
843 | bond_shift_load(e, to, tags); | |
844 | ||
845 | /* Delete element from from->entries. | |
846 | * | |
847 | * We don't add the element to to->hashes. That would only allow | |
848 | * 'e' to be migrated to another slave in this rebalancing run, and | |
849 | * there is no point in doing that. */ | |
850 | list_remove(&e->list_node); | |
851 | ||
852 | /* Re-sort 'bals'. */ | |
853 | reinsert_bal(&bals, from); | |
854 | reinsert_bal(&bals, to); | |
855 | } else { | |
856 | /* Can't usefully migrate anything away from 'from'. | |
857 | * Don't reconsider it. */ | |
858 | list_remove(&from->bal_node); | |
859 | } | |
860 | } | |
861 | ||
862 | /* Implement exponentially weighted moving average. A weight of 1/2 causes | |
863 | * historical data to decay to <1% in 7 rebalancing runs. 1,000,000 bytes | |
864 | * take 20 rebalancing runs to decay to 0 and get deleted entirely. */ | |
865 | for (e = &bond->hash[0]; e <= &bond->hash[BOND_MASK]; e++) { | |
866 | e->tx_bytes /= 2; | |
867 | if (!e->tx_bytes) { | |
868 | e->slave = NULL; | |
869 | } | |
870 | } | |
871 | } | |
872 | \f | |
873 | /* Bonding unixctl user interface functions. */ | |
874 | ||
875 | static struct bond * | |
876 | bond_find(const char *name) | |
877 | { | |
878 | struct bond *bond; | |
879 | ||
880 | HMAP_FOR_EACH_WITH_HASH (bond, hmap_node, hash_string(name, 0), | |
881 | &all_bonds) { | |
882 | if (!strcmp(bond->name, name)) { | |
883 | return bond; | |
884 | } | |
885 | } | |
886 | return NULL; | |
887 | } | |
888 | ||
889 | static struct bond_slave * | |
890 | bond_lookup_slave(struct bond *bond, const char *slave_name) | |
891 | { | |
892 | struct bond_slave *slave; | |
893 | ||
894 | HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) { | |
895 | if (!strcmp(slave->name, slave_name)) { | |
896 | return slave; | |
897 | } | |
898 | } | |
899 | return NULL; | |
900 | } | |
901 | ||
902 | static void | |
903 | bond_unixctl_list(struct unixctl_conn *conn, | |
0e15264f BP |
904 | int argc OVS_UNUSED, const char *argv[] OVS_UNUSED, |
905 | void *aux OVS_UNUSED) | |
f620b43a BP |
906 | { |
907 | struct ds ds = DS_EMPTY_INITIALIZER; | |
908 | const struct bond *bond; | |
909 | ||
910 | ds_put_cstr(&ds, "bond\ttype\tslaves\n"); | |
911 | ||
912 | HMAP_FOR_EACH (bond, hmap_node, &all_bonds) { | |
913 | const struct bond_slave *slave; | |
914 | size_t i; | |
915 | ||
916 | ds_put_format(&ds, "%s\t%s\t", | |
917 | bond->name, bond_mode_to_string(bond->balance)); | |
918 | ||
919 | i = 0; | |
920 | HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) { | |
921 | if (i++ > 0) { | |
922 | ds_put_cstr(&ds, ", "); | |
923 | } | |
924 | ds_put_cstr(&ds, slave->name); | |
925 | } | |
926 | ds_put_char(&ds, '\n'); | |
927 | } | |
bde9f75d | 928 | unixctl_command_reply(conn, ds_cstr(&ds)); |
f620b43a BP |
929 | ds_destroy(&ds); |
930 | } | |
931 | ||
932 | static void | |
c33a8a25 | 933 | bond_print_details(struct ds *ds, const struct bond *bond) |
f620b43a | 934 | { |
fc1d4f01 EJ |
935 | struct shash slave_shash = SHASH_INITIALIZER(&slave_shash); |
936 | const struct shash_node **sorted_slaves = NULL; | |
f620b43a | 937 | const struct bond_slave *slave; |
fc1d4f01 | 938 | int i; |
f620b43a | 939 | |
c33a8a25 EJ |
940 | ds_put_format(ds, "---- %s ----\n", bond->name); |
941 | ds_put_format(ds, "bond_mode: %s\n", | |
f620b43a BP |
942 | bond_mode_to_string(bond->balance)); |
943 | ||
c33a8a25 | 944 | ds_put_format(ds, "bond-hash-basis: %"PRIu32"\n", bond->basis); |
672d18b2 | 945 | |
c33a8a25 EJ |
946 | ds_put_format(ds, "updelay: %d ms\n", bond->updelay); |
947 | ds_put_format(ds, "downdelay: %d ms\n", bond->downdelay); | |
f620b43a | 948 | |
1b137691 | 949 | if (bond_is_balanced(bond)) { |
c33a8a25 | 950 | ds_put_format(ds, "next rebalance: %lld ms\n", |
f620b43a BP |
951 | bond->next_rebalance - time_msec()); |
952 | } | |
953 | ||
bdebeece EJ |
954 | ds_put_cstr(ds, "lacp_status: "); |
955 | switch (bond->lacp_status) { | |
956 | case LACP_NEGOTIATED: | |
957 | ds_put_cstr(ds, "negotiated\n"); | |
958 | break; | |
959 | case LACP_CONFIGURED: | |
960 | ds_put_cstr(ds, "configured\n"); | |
961 | break; | |
962 | case LACP_DISABLED: | |
963 | ds_put_cstr(ds, "off\n"); | |
964 | break; | |
965 | default: | |
966 | ds_put_cstr(ds, "<unknown>\n"); | |
967 | break; | |
968 | } | |
4d6fb5eb | 969 | |
f620b43a | 970 | HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) { |
fc1d4f01 EJ |
971 | shash_add(&slave_shash, slave->name, slave); |
972 | } | |
973 | sorted_slaves = shash_sort(&slave_shash); | |
974 | ||
975 | for (i = 0; i < shash_count(&slave_shash); i++) { | |
f620b43a | 976 | struct bond_entry *be; |
f620b43a | 977 | |
fc1d4f01 EJ |
978 | slave = sorted_slaves[i]->data; |
979 | ||
f620b43a | 980 | /* Basic info. */ |
c33a8a25 | 981 | ds_put_format(ds, "\nslave %s: %s\n", |
f620b43a BP |
982 | slave->name, slave->enabled ? "enabled" : "disabled"); |
983 | if (slave == bond->active_slave) { | |
c33a8a25 | 984 | ds_put_cstr(ds, "\tactive slave\n"); |
f620b43a BP |
985 | } |
986 | if (slave->delay_expires != LLONG_MAX) { | |
c33a8a25 | 987 | ds_put_format(ds, "\t%s expires in %lld ms\n", |
f620b43a BP |
988 | slave->enabled ? "downdelay" : "updelay", |
989 | slave->delay_expires - time_msec()); | |
990 | } | |
991 | ||
c33a8a25 | 992 | ds_put_format(ds, "\tmay_enable: %s\n", |
296f6519 | 993 | slave->may_enable ? "true" : "false"); |
4d6fb5eb | 994 | |
1b137691 | 995 | if (!bond_is_balanced(bond)) { |
f620b43a BP |
996 | continue; |
997 | } | |
998 | ||
999 | /* Hashes. */ | |
f620b43a BP |
1000 | for (be = bond->hash; be <= &bond->hash[BOND_MASK]; be++) { |
1001 | int hash = be - bond->hash; | |
1002 | ||
1003 | if (be->slave != slave) { | |
1004 | continue; | |
1005 | } | |
1006 | ||
c33a8a25 | 1007 | ds_put_format(ds, "\thash %d: %"PRIu64" kB load\n", |
f620b43a BP |
1008 | hash, be->tx_bytes / 1024); |
1009 | ||
7b9f1974 | 1010 | /* XXX How can we list the MACs assigned to hashes of SLB bonds? */ |
f620b43a BP |
1011 | } |
1012 | } | |
fc1d4f01 EJ |
1013 | shash_destroy(&slave_shash); |
1014 | free(sorted_slaves); | |
c33a8a25 EJ |
1015 | ds_put_cstr(ds, "\n"); |
1016 | } | |
1017 | ||
1018 | static void | |
1019 | bond_unixctl_show(struct unixctl_conn *conn, | |
1020 | int argc, const char *argv[], | |
1021 | void *aux OVS_UNUSED) | |
1022 | { | |
1023 | struct ds ds = DS_EMPTY_INITIALIZER; | |
1024 | ||
1025 | if (argc > 1) { | |
1026 | const struct bond *bond = bond_find(argv[1]); | |
1027 | ||
1028 | if (!bond) { | |
bde9f75d | 1029 | unixctl_command_reply_error(conn, "no such bond"); |
c33a8a25 EJ |
1030 | return; |
1031 | } | |
1032 | bond_print_details(&ds, bond); | |
1033 | } else { | |
1034 | const struct bond *bond; | |
1035 | ||
1036 | HMAP_FOR_EACH (bond, hmap_node, &all_bonds) { | |
1037 | bond_print_details(&ds, bond); | |
1038 | } | |
1039 | } | |
1040 | ||
bde9f75d | 1041 | unixctl_command_reply(conn, ds_cstr(&ds)); |
f620b43a BP |
1042 | ds_destroy(&ds); |
1043 | } | |
1044 | ||
1045 | static void | |
0e15264f BP |
1046 | bond_unixctl_migrate(struct unixctl_conn *conn, |
1047 | int argc OVS_UNUSED, const char *argv[], | |
f620b43a BP |
1048 | void *aux OVS_UNUSED) |
1049 | { | |
0e15264f BP |
1050 | const char *bond_s = argv[1]; |
1051 | const char *hash_s = argv[2]; | |
1052 | const char *slave_s = argv[3]; | |
f620b43a BP |
1053 | struct bond *bond; |
1054 | struct bond_slave *slave; | |
1055 | struct bond_entry *entry; | |
1056 | int hash; | |
1057 | ||
f620b43a BP |
1058 | bond = bond_find(bond_s); |
1059 | if (!bond) { | |
bde9f75d | 1060 | unixctl_command_reply_error(conn, "no such bond"); |
f620b43a BP |
1061 | return; |
1062 | } | |
1063 | ||
1064 | if (bond->balance != BM_SLB) { | |
bde9f75d | 1065 | unixctl_command_reply_error(conn, "not an SLB bond"); |
f620b43a BP |
1066 | return; |
1067 | } | |
1068 | ||
1069 | if (strspn(hash_s, "0123456789") == strlen(hash_s)) { | |
1070 | hash = atoi(hash_s) & BOND_MASK; | |
1071 | } else { | |
bde9f75d | 1072 | unixctl_command_reply_error(conn, "bad hash"); |
f620b43a BP |
1073 | return; |
1074 | } | |
1075 | ||
1076 | slave = bond_lookup_slave(bond, slave_s); | |
1077 | if (!slave) { | |
bde9f75d | 1078 | unixctl_command_reply_error(conn, "no such slave"); |
f620b43a BP |
1079 | return; |
1080 | } | |
1081 | ||
1082 | if (!slave->enabled) { | |
bde9f75d | 1083 | unixctl_command_reply_error(conn, "cannot migrate to disabled slave"); |
f620b43a BP |
1084 | return; |
1085 | } | |
1086 | ||
1087 | entry = &bond->hash[hash]; | |
1088 | tag_set_add(&bond->unixctl_tags, entry->tag); | |
1089 | entry->slave = slave; | |
1090 | entry->tag = tag_create_random(); | |
bde9f75d | 1091 | unixctl_command_reply(conn, "migrated"); |
f620b43a BP |
1092 | } |
1093 | ||
1094 | static void | |
0e15264f BP |
1095 | bond_unixctl_set_active_slave(struct unixctl_conn *conn, |
1096 | int argc OVS_UNUSED, const char *argv[], | |
f620b43a BP |
1097 | void *aux OVS_UNUSED) |
1098 | { | |
0e15264f BP |
1099 | const char *bond_s = argv[1]; |
1100 | const char *slave_s = argv[2]; | |
f620b43a BP |
1101 | struct bond *bond; |
1102 | struct bond_slave *slave; | |
1103 | ||
f620b43a BP |
1104 | bond = bond_find(bond_s); |
1105 | if (!bond) { | |
bde9f75d | 1106 | unixctl_command_reply_error(conn, "no such bond"); |
f620b43a BP |
1107 | return; |
1108 | } | |
1109 | ||
1110 | slave = bond_lookup_slave(bond, slave_s); | |
1111 | if (!slave) { | |
bde9f75d | 1112 | unixctl_command_reply_error(conn, "no such slave"); |
f620b43a BP |
1113 | return; |
1114 | } | |
1115 | ||
1116 | if (!slave->enabled) { | |
bde9f75d | 1117 | unixctl_command_reply_error(conn, "cannot make disabled slave active"); |
f620b43a BP |
1118 | return; |
1119 | } | |
1120 | ||
1121 | if (bond->active_slave != slave) { | |
1122 | tag_set_add(&bond->unixctl_tags, bond_get_active_slave_tag(bond)); | |
1123 | bond->active_slave = slave; | |
1124 | bond->active_slave->tag = tag_create_random(); | |
1125 | VLOG_INFO("bond %s: active interface is now %s", | |
1126 | bond->name, slave->name); | |
1127 | bond->send_learning_packets = true; | |
bde9f75d | 1128 | unixctl_command_reply(conn, "done"); |
f620b43a | 1129 | } else { |
bde9f75d | 1130 | unixctl_command_reply(conn, "no change"); |
f620b43a BP |
1131 | } |
1132 | } | |
1133 | ||
1134 | static void | |
0e15264f | 1135 | enable_slave(struct unixctl_conn *conn, const char *argv[], bool enable) |
f620b43a | 1136 | { |
0e15264f BP |
1137 | const char *bond_s = argv[1]; |
1138 | const char *slave_s = argv[2]; | |
f620b43a BP |
1139 | struct bond *bond; |
1140 | struct bond_slave *slave; | |
1141 | ||
f620b43a BP |
1142 | bond = bond_find(bond_s); |
1143 | if (!bond) { | |
bde9f75d | 1144 | unixctl_command_reply_error(conn, "no such bond"); |
f620b43a BP |
1145 | return; |
1146 | } | |
1147 | ||
1148 | slave = bond_lookup_slave(bond, slave_s); | |
1149 | if (!slave) { | |
bde9f75d | 1150 | unixctl_command_reply_error(conn, "no such slave"); |
f620b43a BP |
1151 | return; |
1152 | } | |
1153 | ||
1154 | bond_enable_slave(slave, enable, &bond->unixctl_tags); | |
bde9f75d | 1155 | unixctl_command_reply(conn, enable ? "enabled" : "disabled"); |
f620b43a BP |
1156 | } |
1157 | ||
1158 | static void | |
0e15264f BP |
1159 | bond_unixctl_enable_slave(struct unixctl_conn *conn, |
1160 | int argc OVS_UNUSED, const char *argv[], | |
f620b43a BP |
1161 | void *aux OVS_UNUSED) |
1162 | { | |
0e15264f | 1163 | enable_slave(conn, argv, true); |
f620b43a BP |
1164 | } |
1165 | ||
1166 | static void | |
0e15264f BP |
1167 | bond_unixctl_disable_slave(struct unixctl_conn *conn, |
1168 | int argc OVS_UNUSED, const char *argv[], | |
f620b43a BP |
1169 | void *aux OVS_UNUSED) |
1170 | { | |
0e15264f | 1171 | enable_slave(conn, argv, false); |
f620b43a BP |
1172 | } |
1173 | ||
1174 | static void | |
0e15264f | 1175 | bond_unixctl_hash(struct unixctl_conn *conn, int argc, const char *argv[], |
f620b43a BP |
1176 | void *aux OVS_UNUSED) |
1177 | { | |
0e15264f BP |
1178 | const char *mac_s = argv[1]; |
1179 | const char *vlan_s = argc > 2 ? argv[2] : NULL; | |
1180 | const char *basis_s = argc > 3 ? argv[3] : NULL; | |
f620b43a BP |
1181 | uint8_t mac[ETH_ADDR_LEN]; |
1182 | uint8_t hash; | |
1183 | char *hash_cstr; | |
1184 | unsigned int vlan; | |
672d18b2 | 1185 | uint32_t basis; |
f620b43a BP |
1186 | |
1187 | if (vlan_s) { | |
1188 | if (sscanf(vlan_s, "%u", &vlan) != 1) { | |
bde9f75d | 1189 | unixctl_command_reply_error(conn, "invalid vlan"); |
f620b43a BP |
1190 | return; |
1191 | } | |
1192 | } else { | |
dc155bff | 1193 | vlan = 0; |
f620b43a BP |
1194 | } |
1195 | ||
672d18b2 EJ |
1196 | if (basis_s) { |
1197 | if (sscanf(basis_s, "%"PRIu32, &basis) != 1) { | |
bde9f75d | 1198 | unixctl_command_reply_error(conn, "invalid basis"); |
672d18b2 EJ |
1199 | return; |
1200 | } | |
1201 | } else { | |
1202 | basis = 0; | |
1203 | } | |
1204 | ||
f620b43a BP |
1205 | if (sscanf(mac_s, ETH_ADDR_SCAN_FMT, ETH_ADDR_SCAN_ARGS(mac)) |
1206 | == ETH_ADDR_SCAN_COUNT) { | |
672d18b2 | 1207 | hash = bond_hash_src(mac, vlan, basis) & BOND_MASK; |
f620b43a BP |
1208 | |
1209 | hash_cstr = xasprintf("%u", hash); | |
bde9f75d | 1210 | unixctl_command_reply(conn, hash_cstr); |
f620b43a BP |
1211 | free(hash_cstr); |
1212 | } else { | |
bde9f75d | 1213 | unixctl_command_reply_error(conn, "invalid mac"); |
f620b43a BP |
1214 | } |
1215 | } | |
1216 | ||
1217 | void | |
1218 | bond_init(void) | |
1219 | { | |
0e15264f | 1220 | unixctl_command_register("bond/list", "", 0, 0, bond_unixctl_list, NULL); |
c33a8a25 EJ |
1221 | unixctl_command_register("bond/show", "[port]", 0, 1, bond_unixctl_show, |
1222 | NULL); | |
0e15264f | 1223 | unixctl_command_register("bond/migrate", "port hash slave", 3, 3, |
7ff2009a | 1224 | bond_unixctl_migrate, NULL); |
0e15264f | 1225 | unixctl_command_register("bond/set-active-slave", "port slave", 2, 2, |
f620b43a | 1226 | bond_unixctl_set_active_slave, NULL); |
0e15264f | 1227 | unixctl_command_register("bond/enable-slave", "port slave", 2, 2, |
7ff2009a | 1228 | bond_unixctl_enable_slave, NULL); |
0e15264f | 1229 | unixctl_command_register("bond/disable-slave", "port slave", 2, 2, |
7ff2009a | 1230 | bond_unixctl_disable_slave, NULL); |
0e15264f | 1231 | unixctl_command_register("bond/hash", "mac [vlan] [basis]", 1, 3, |
7ff2009a | 1232 | bond_unixctl_hash, NULL); |
f620b43a BP |
1233 | } |
1234 | \f | |
95aafb2a EJ |
1235 | static void |
1236 | bond_entry_reset(struct bond *bond) | |
1237 | { | |
1238 | if (bond->balance != BM_AB) { | |
1239 | size_t hash_len = (BOND_MASK + 1) * sizeof *bond->hash; | |
1240 | ||
1241 | if (!bond->hash) { | |
1242 | bond->hash = xmalloc(hash_len); | |
1243 | } | |
1244 | memset(bond->hash, 0, hash_len); | |
1245 | ||
1246 | bond->next_rebalance = time_msec() + bond->rebalance_interval; | |
1247 | } else { | |
1248 | free(bond->hash); | |
1249 | bond->hash = NULL; | |
1250 | } | |
1251 | } | |
1252 | ||
f620b43a BP |
1253 | static struct bond_slave * |
1254 | bond_slave_lookup(struct bond *bond, const void *slave_) | |
1255 | { | |
1256 | struct bond_slave *slave; | |
1257 | ||
1258 | HMAP_FOR_EACH_IN_BUCKET (slave, hmap_node, hash_pointer(slave_, 0), | |
1259 | &bond->slaves) { | |
1260 | if (slave->aux == slave_) { | |
1261 | return slave; | |
1262 | } | |
1263 | } | |
1264 | ||
1265 | return NULL; | |
1266 | } | |
1267 | ||
f620b43a BP |
1268 | static void |
1269 | bond_enable_slave(struct bond_slave *slave, bool enable, struct tag_set *tags) | |
1270 | { | |
1271 | slave->delay_expires = LLONG_MAX; | |
1272 | if (enable != slave->enabled) { | |
1273 | slave->enabled = enable; | |
1274 | if (!slave->enabled) { | |
d28b9ead | 1275 | VLOG_INFO("interface %s: disabled", slave->name); |
b3c18f66 EJ |
1276 | if (tags) { |
1277 | tag_set_add(tags, slave->tag); | |
1278 | } | |
f620b43a | 1279 | } else { |
d28b9ead | 1280 | VLOG_INFO("interface %s: enabled", slave->name); |
f620b43a BP |
1281 | slave->tag = tag_create_random(); |
1282 | } | |
1283 | } | |
1284 | } | |
1285 | ||
1286 | static void | |
1287 | bond_link_status_update(struct bond_slave *slave, struct tag_set *tags) | |
1288 | { | |
1289 | struct bond *bond = slave->bond; | |
1290 | bool up; | |
1291 | ||
296f6519 | 1292 | up = netdev_get_carrier(slave->netdev) && slave->may_enable; |
f620b43a BP |
1293 | if ((up == slave->enabled) != (slave->delay_expires == LLONG_MAX)) { |
1294 | static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20); | |
1295 | VLOG_INFO_RL(&rl, "interface %s: link state %s", | |
1296 | slave->name, up ? "up" : "down"); | |
1297 | if (up == slave->enabled) { | |
1298 | slave->delay_expires = LLONG_MAX; | |
1299 | VLOG_INFO_RL(&rl, "interface %s: will not be %s", | |
1300 | slave->name, up ? "disabled" : "enabled"); | |
1301 | } else { | |
bdebeece | 1302 | int delay = (bond->lacp_status != LACP_DISABLED ? 0 |
f620b43a BP |
1303 | : up ? bond->updelay : bond->downdelay); |
1304 | slave->delay_expires = time_msec() + delay; | |
1305 | if (delay) { | |
1306 | VLOG_INFO_RL(&rl, "interface %s: will be %s if it stays %s " | |
1307 | "for %d ms", | |
1308 | slave->name, | |
1309 | up ? "enabled" : "disabled", | |
1310 | up ? "up" : "down", | |
1311 | delay); | |
1312 | } | |
1313 | } | |
1314 | } | |
1315 | ||
1316 | if (time_msec() >= slave->delay_expires) { | |
1317 | bond_enable_slave(slave, up, tags); | |
1318 | } | |
1319 | } | |
1320 | ||
f620b43a | 1321 | static unsigned int |
672d18b2 | 1322 | bond_hash_src(const uint8_t mac[ETH_ADDR_LEN], uint16_t vlan, uint32_t basis) |
f620b43a | 1323 | { |
672d18b2 | 1324 | return hash_3words(hash_bytes(mac, ETH_ADDR_LEN, 0), vlan, basis); |
f620b43a BP |
1325 | } |
1326 | ||
1327 | static unsigned int | |
672d18b2 | 1328 | bond_hash_tcp(const struct flow *flow, uint16_t vlan, uint32_t basis) |
f620b43a BP |
1329 | { |
1330 | struct flow hash_flow = *flow; | |
d84d4b88 | 1331 | hash_flow.vlan_tci = htons(vlan); |
f620b43a BP |
1332 | |
1333 | /* The symmetric quality of this hash function is not required, but | |
1334 | * flow_hash_symmetric_l4 already exists, and is sufficient for our | |
1335 | * purposes, so we use it out of convenience. */ | |
672d18b2 | 1336 | return flow_hash_symmetric_l4(&hash_flow, basis); |
f620b43a BP |
1337 | } |
1338 | ||
fb0b29a3 EJ |
1339 | static unsigned int |
1340 | bond_hash(const struct bond *bond, const struct flow *flow, uint16_t vlan) | |
1341 | { | |
cb22974d | 1342 | ovs_assert(bond->balance == BM_TCP || bond->balance == BM_SLB); |
fb0b29a3 | 1343 | |
bdebeece | 1344 | return (bond->balance == BM_TCP |
672d18b2 EJ |
1345 | ? bond_hash_tcp(flow, vlan, bond->basis) |
1346 | : bond_hash_src(flow->dl_src, vlan, bond->basis)); | |
fb0b29a3 EJ |
1347 | } |
1348 | ||
f620b43a BP |
1349 | static struct bond_entry * |
1350 | lookup_bond_entry(const struct bond *bond, const struct flow *flow, | |
1351 | uint16_t vlan) | |
1352 | { | |
fb0b29a3 | 1353 | return &bond->hash[bond_hash(bond, flow, vlan) & BOND_MASK]; |
f620b43a BP |
1354 | } |
1355 | ||
1356 | static struct bond_slave * | |
1357 | choose_output_slave(const struct bond *bond, const struct flow *flow, | |
bcd2633a | 1358 | struct flow_wildcards *wc, uint16_t vlan, tag_type *tags) |
f620b43a BP |
1359 | { |
1360 | struct bond_entry *e; | |
1361 | ||
bdebeece EJ |
1362 | if (bond->lacp_status == LACP_CONFIGURED) { |
1363 | /* LACP has been configured on this bond but negotiations were | |
1364 | * unsuccussful. Drop all traffic. */ | |
1365 | return NULL; | |
1366 | } | |
1367 | ||
f620b43a BP |
1368 | switch (bond->balance) { |
1369 | case BM_AB: | |
1370 | return bond->active_slave; | |
1371 | ||
f620b43a | 1372 | case BM_TCP: |
bdebeece EJ |
1373 | if (bond->lacp_status != LACP_NEGOTIATED) { |
1374 | /* Must have LACP negotiations for TCP balanced bonds. */ | |
1375 | return NULL; | |
1376 | } | |
bcd2633a JP |
1377 | if (wc) { |
1378 | flow_mask_hash_fields(wc, NX_HASH_FIELDS_SYMMETRIC_L4); | |
1379 | } | |
bdebeece EJ |
1380 | /* Fall Through. */ |
1381 | case BM_SLB: | |
bcd2633a JP |
1382 | if (wc) { |
1383 | flow_mask_hash_fields(wc, NX_HASH_FIELDS_ETH_SRC); | |
1384 | } | |
f620b43a BP |
1385 | e = lookup_bond_entry(bond, flow, vlan); |
1386 | if (!e->slave || !e->slave->enabled) { | |
c804cadf EJ |
1387 | e->slave = CONTAINER_OF(hmap_random_node(&bond->slaves), |
1388 | struct bond_slave, hmap_node); | |
1389 | if (!e->slave->enabled) { | |
1390 | e->slave = bond->active_slave; | |
1391 | } | |
f620b43a BP |
1392 | e->tag = tag_create_random(); |
1393 | } | |
00ed8314 | 1394 | *tags |= e->tag; |
f620b43a BP |
1395 | return e->slave; |
1396 | ||
1397 | default: | |
1398 | NOT_REACHED(); | |
1399 | } | |
1400 | } | |
1401 | ||
1402 | static struct bond_slave * | |
1403 | bond_choose_slave(const struct bond *bond) | |
1404 | { | |
1405 | struct bond_slave *slave, *best; | |
1406 | ||
1407 | /* Find an enabled slave. */ | |
1408 | HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) { | |
1409 | if (slave->enabled) { | |
1410 | return slave; | |
1411 | } | |
1412 | } | |
1413 | ||
1414 | /* All interfaces are disabled. Find an interface that will be enabled | |
1415 | * after its updelay expires. */ | |
1416 | best = NULL; | |
1417 | HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) { | |
1418 | if (slave->delay_expires != LLONG_MAX | |
296f6519 | 1419 | && slave->may_enable |
f620b43a BP |
1420 | && (!best || slave->delay_expires < best->delay_expires)) { |
1421 | best = slave; | |
1422 | } | |
1423 | } | |
1424 | return best; | |
1425 | } | |
1426 | ||
1427 | static void | |
1428 | bond_choose_active_slave(struct bond *bond, struct tag_set *tags) | |
1429 | { | |
1430 | static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20); | |
1431 | struct bond_slave *old_active_slave = bond->active_slave; | |
1432 | ||
1433 | bond->active_slave = bond_choose_slave(bond); | |
1434 | if (bond->active_slave) { | |
1435 | if (bond->active_slave->enabled) { | |
1436 | VLOG_INFO_RL(&rl, "bond %s: active interface is now %s", | |
1437 | bond->name, bond->active_slave->name); | |
1438 | } else { | |
1439 | VLOG_INFO_RL(&rl, "bond %s: active interface is now %s, skipping " | |
1440 | "remaining %lld ms updelay (since no interface was " | |
1441 | "enabled)", bond->name, bond->active_slave->name, | |
1442 | bond->active_slave->delay_expires - time_msec()); | |
1443 | bond_enable_slave(bond->active_slave, true, tags); | |
1444 | } | |
1445 | ||
1446 | if (!old_active_slave) { | |
1447 | tag_set_add(tags, bond->no_slaves_tag); | |
1448 | } | |
1449 | ||
1450 | bond->send_learning_packets = true; | |
1451 | } else if (old_active_slave) { | |
d28b9ead | 1452 | VLOG_INFO_RL(&rl, "bond %s: all interfaces disabled", bond->name); |
f620b43a BP |
1453 | } |
1454 | } | |
1455 | ||
1456 | /* Returns the tag for 'bond''s active slave, or 'bond''s no_slaves_tag if | |
1457 | * there is no active slave. */ | |
1458 | static tag_type | |
1459 | bond_get_active_slave_tag(const struct bond *bond) | |
1460 | { | |
1461 | return (bond->active_slave | |
1462 | ? bond->active_slave->tag | |
1463 | : bond->no_slaves_tag); | |
1464 | } | |
1465 | ||
1466 | /* Attempts to make the sum of the bond slaves' statistics appear on the fake | |
1467 | * bond interface. */ | |
1468 | static void | |
1469 | bond_update_fake_slave_stats(struct bond *bond) | |
1470 | { | |
1471 | struct netdev_stats bond_stats; | |
1472 | struct bond_slave *slave; | |
1473 | struct netdev *bond_dev; | |
1474 | ||
1475 | memset(&bond_stats, 0, sizeof bond_stats); | |
1476 | ||
1477 | HMAP_FOR_EACH (slave, hmap_node, &bond->slaves) { | |
1478 | struct netdev_stats slave_stats; | |
1479 | ||
1480 | if (!netdev_get_stats(slave->netdev, &slave_stats)) { | |
1481 | /* XXX: We swap the stats here because they are swapped back when | |
1482 | * reported by the internal device. The reason for this is | |
1483 | * internal devices normally represent packets going into the | |
1484 | * system but when used as fake bond device they represent packets | |
1485 | * leaving the system. We really should do this in the internal | |
1486 | * device itself because changing it here reverses the counts from | |
1487 | * the perspective of the switch. However, the internal device | |
1488 | * doesn't know what type of device it represents so we have to do | |
1489 | * it here for now. */ | |
1490 | bond_stats.tx_packets += slave_stats.rx_packets; | |
1491 | bond_stats.tx_bytes += slave_stats.rx_bytes; | |
1492 | bond_stats.rx_packets += slave_stats.tx_packets; | |
1493 | bond_stats.rx_bytes += slave_stats.tx_bytes; | |
1494 | } | |
1495 | } | |
1496 | ||
18812dff | 1497 | if (!netdev_open(bond->name, "system", &bond_dev)) { |
f620b43a BP |
1498 | netdev_set_stats(bond_dev, &bond_stats); |
1499 | netdev_close(bond_dev); | |
1500 | } | |
1501 | } |