blob: 9cb7044d0801605c629cadb5bb775b8c3725bcbc [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Spanning tree protocol; generic parts
3 * Linux ethernet bridge
4 *
5 * Authors:
6 * Lennert Buytenhek <buytenh@gnu.org>
7 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 */
13#include <linux/kernel.h>
Franck Bui-Huu82524742008-05-12 21:21:05 +020014#include <linux/rculist.h>
Scott Feldman38dcf352014-11-28 14:34:20 +010015#include <net/switchdev.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016
17#include "br_private.h"
18#include "br_private_stp.h"
19
20/* since time values in bpdu are in jiffies and then scaled (1/256)
Joakim Tjernlundaaca7352012-03-01 08:12:18 +000021 * before sending, make sure that is at least one STP tick.
Linus Torvalds1da177e2005-04-16 15:20:36 -070022 */
Joakim Tjernlundaaca7352012-03-01 08:12:18 +000023#define MESSAGE_AGE_INCR ((HZ / 256) + 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -070024
Jan Engelhardt36cbd3d2009-08-05 10:42:58 -070025static const char *const br_port_state_names[] = {
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +090026 [BR_STATE_DISABLED] = "disabled",
Linus Torvalds1da177e2005-04-16 15:20:36 -070027 [BR_STATE_LISTENING] = "listening",
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +090028 [BR_STATE_LEARNING] = "learning",
29 [BR_STATE_FORWARDING] = "forwarding",
Linus Torvalds1da177e2005-04-16 15:20:36 -070030 [BR_STATE_BLOCKING] = "blocking",
31};
32
Florian Fainelli775dd692014-09-30 16:13:19 -070033void br_set_state(struct net_bridge_port *p, unsigned int state)
34{
Scott Feldman35636062015-05-10 09:47:51 -070035 struct switchdev_attr attr = {
Ido Schimmel6ff64f62015-12-15 16:03:35 +010036 .orig_dev = p->dev,
Jiri Pirko1f868392015-10-01 11:03:42 +020037 .id = SWITCHDEV_ATTR_ID_PORT_STP_STATE,
Jiri Pirko0bc05d52015-10-14 19:40:50 +020038 .flags = SWITCHDEV_F_DEFER,
Scott Feldman42275bd2015-05-13 11:16:50 -070039 .u.stp_state = state,
Scott Feldman35636062015-05-10 09:47:51 -070040 };
Scott Feldman38dcf352014-11-28 14:34:20 +010041 int err;
42
Florian Fainelli775dd692014-09-30 16:13:19 -070043 p->state = state;
Scott Feldman35636062015-05-10 09:47:51 -070044 err = switchdev_port_attr_set(p->dev, &attr);
Ido Schimmelbbe14f52015-11-13 13:06:12 +020045 if (err && err != -EOPNOTSUPP)
Scott Feldman38dcf352014-11-28 14:34:20 +010046 br_warn(p->br, "error setting offload STP state on port %u(%s)\n",
47 (unsigned int) p->port_no, p->dev->name);
Vivien Didelot7c25b162016-02-16 10:09:51 -050048 else
49 br_info(p->br, "port %u(%s) entered %s state\n",
50 (unsigned int) p->port_no, p->dev->name,
51 br_port_state_names[p->state]);
Florian Fainelli775dd692014-09-30 16:13:19 -070052}
53
Linus Torvalds1da177e2005-04-16 15:20:36 -070054/* called under bridge lock */
55struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no)
56{
57 struct net_bridge_port *p;
58
59 list_for_each_entry_rcu(p, &br->port_list, list) {
60 if (p->port_no == port_no)
61 return p;
62 }
63
64 return NULL;
65}
66
67/* called under bridge lock */
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +090068static int br_should_become_root_port(const struct net_bridge_port *p,
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 u16 root_port)
70{
71 struct net_bridge *br;
72 struct net_bridge_port *rp;
73 int t;
74
75 br = p->br;
76 if (p->state == BR_STATE_DISABLED ||
77 br_is_designated_port(p))
78 return 0;
79
80 if (memcmp(&br->bridge_id, &p->designated_root, 8) <= 0)
81 return 0;
82
83 if (!root_port)
84 return 1;
85
86 rp = br_get_port(br, root_port);
87
88 t = memcmp(&p->designated_root, &rp->designated_root, 8);
89 if (t < 0)
90 return 1;
91 else if (t > 0)
92 return 0;
93
94 if (p->designated_cost + p->path_cost <
95 rp->designated_cost + rp->path_cost)
96 return 1;
97 else if (p->designated_cost + p->path_cost >
98 rp->designated_cost + rp->path_cost)
99 return 0;
100
101 t = memcmp(&p->designated_bridge, &rp->designated_bridge, 8);
102 if (t < 0)
103 return 1;
104 else if (t > 0)
105 return 0;
106
107 if (p->designated_port < rp->designated_port)
108 return 1;
109 else if (p->designated_port > rp->designated_port)
110 return 0;
111
112 if (p->port_id < rp->port_id)
113 return 1;
114
115 return 0;
116}
117
stephen hemminger1007dd12012-11-13 07:53:08 +0000118static void br_root_port_block(const struct net_bridge *br,
119 struct net_bridge_port *p)
120{
121
122 br_notice(br, "port %u(%s) tried to become root port (blocked)",
123 (unsigned int) p->port_no, p->dev->name);
124
Florian Fainelli775dd692014-09-30 16:13:19 -0700125 br_set_state(p, BR_STATE_LISTENING);
stephen hemminger1007dd12012-11-13 07:53:08 +0000126 br_ifinfo_notify(RTM_NEWLINK, p);
127
128 if (br->forward_delay > 0)
129 mod_timer(&p->forward_delay_timer, jiffies + br->forward_delay);
130}
131
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132/* called under bridge lock */
133static void br_root_selection(struct net_bridge *br)
134{
135 struct net_bridge_port *p;
136 u16 root_port = 0;
137
138 list_for_each_entry(p, &br->port_list, list) {
stephen hemminger1007dd12012-11-13 07:53:08 +0000139 if (!br_should_become_root_port(p, root_port))
140 continue;
141
142 if (p->flags & BR_ROOT_BLOCK)
143 br_root_port_block(br, p);
144 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 root_port = p->port_no;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 }
147
148 br->root_port = root_port;
149
150 if (!root_port) {
151 br->designated_root = br->bridge_id;
152 br->root_path_cost = 0;
153 } else {
154 p = br_get_port(br, root_port);
155 br->designated_root = p->designated_root;
156 br->root_path_cost = p->designated_cost + p->path_cost;
157 }
158}
159
160/* called under bridge lock */
161void br_become_root_bridge(struct net_bridge *br)
162{
163 br->max_age = br->bridge_max_age;
164 br->hello_time = br->bridge_hello_time;
165 br->forward_delay = br->bridge_forward_delay;
166 br_topology_change_detection(br);
167 del_timer(&br->tcn_timer);
168
169 if (br->dev->flags & IFF_UP) {
170 br_config_bpdu_generation(br);
171 mod_timer(&br->hello_timer, jiffies + br->hello_time);
172 }
173}
174
175/* called under bridge lock */
176void br_transmit_config(struct net_bridge_port *p)
177{
178 struct br_config_bpdu bpdu;
179 struct net_bridge *br;
180
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 if (timer_pending(&p->hold_timer)) {
182 p->config_pending = 1;
183 return;
184 }
185
186 br = p->br;
187
188 bpdu.topology_change = br->topology_change;
189 bpdu.topology_change_ack = p->topology_change_ack;
190 bpdu.root = br->designated_root;
191 bpdu.root_path_cost = br->root_path_cost;
192 bpdu.bridge_id = br->bridge_id;
193 bpdu.port_id = p->port_id;
194 if (br_is_root_bridge(br))
195 bpdu.message_age = 0;
196 else {
197 struct net_bridge_port *root
198 = br_get_port(br, br->root_port);
stephen hemminger0c031502011-07-22 07:47:06 +0000199 bpdu.message_age = (jiffies - root->designated_age)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 + MESSAGE_AGE_INCR;
201 }
202 bpdu.max_age = br->max_age;
203 bpdu.hello_time = br->hello_time;
204 bpdu.forward_delay = br->forward_delay;
205
206 if (bpdu.message_age < br->max_age) {
207 br_send_config_bpdu(p, &bpdu);
208 p->topology_change_ack = 0;
209 p->config_pending = 0;
Nikolay Aleksandrov76b91c32015-07-23 11:01:05 -0700210 if (p->br->stp_enabled == BR_KERNEL_STP)
211 mod_timer(&p->hold_timer,
212 round_jiffies(jiffies + BR_HOLD_TIME));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 }
214}
215
216/* called under bridge lock */
stephen hemminger160d73b2011-07-22 07:47:10 +0000217static void br_record_config_information(struct net_bridge_port *p,
218 const struct br_config_bpdu *bpdu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219{
220 p->designated_root = bpdu->root;
221 p->designated_cost = bpdu->root_path_cost;
222 p->designated_bridge = bpdu->bridge_id;
223 p->designated_port = bpdu->port_id;
Joakim Tjernlund709e1b52012-03-01 08:12:19 +0000224 p->designated_age = jiffies - bpdu->message_age;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900226 mod_timer(&p->message_age_timer, jiffies
Chris Healy9a062012013-09-11 21:37:47 -0700227 + (bpdu->max_age - bpdu->message_age));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228}
229
230/* called under bridge lock */
stephen hemminger160d73b2011-07-22 07:47:10 +0000231static void br_record_config_timeout_values(struct net_bridge *br,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 const struct br_config_bpdu *bpdu)
233{
234 br->max_age = bpdu->max_age;
235 br->hello_time = bpdu->hello_time;
236 br->forward_delay = bpdu->forward_delay;
237 br->topology_change = bpdu->topology_change;
238}
239
240/* called under bridge lock */
241void br_transmit_tcn(struct net_bridge *br)
242{
stephen hemminger91bc0332013-04-30 05:29:27 +0000243 struct net_bridge_port *p;
244
245 p = br_get_port(br, br->root_port);
246 if (p)
247 br_send_tcn_bpdu(p);
248 else
249 br_notice(br, "root port %u not found for topology notice\n",
250 br->root_port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251}
252
253/* called under bridge lock */
254static int br_should_become_designated_port(const struct net_bridge_port *p)
255{
256 struct net_bridge *br;
257 int t;
258
259 br = p->br;
260 if (br_is_designated_port(p))
261 return 1;
262
263 if (memcmp(&p->designated_root, &br->designated_root, 8))
264 return 1;
265
266 if (br->root_path_cost < p->designated_cost)
267 return 1;
268 else if (br->root_path_cost > p->designated_cost)
269 return 0;
270
271 t = memcmp(&br->bridge_id, &p->designated_bridge, 8);
272 if (t < 0)
273 return 1;
274 else if (t > 0)
275 return 0;
276
277 if (p->port_id < p->designated_port)
278 return 1;
279
280 return 0;
281}
282
283/* called under bridge lock */
284static void br_designated_port_selection(struct net_bridge *br)
285{
286 struct net_bridge_port *p;
287
288 list_for_each_entry(p, &br->port_list, list) {
289 if (p->state != BR_STATE_DISABLED &&
290 br_should_become_designated_port(p))
291 br_become_designated_port(p);
292
293 }
294}
295
296/* called under bridge lock */
stephen hemminger160d73b2011-07-22 07:47:10 +0000297static int br_supersedes_port_info(const struct net_bridge_port *p,
298 const struct br_config_bpdu *bpdu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299{
300 int t;
301
302 t = memcmp(&bpdu->root, &p->designated_root, 8);
303 if (t < 0)
304 return 1;
305 else if (t > 0)
306 return 0;
307
308 if (bpdu->root_path_cost < p->designated_cost)
309 return 1;
310 else if (bpdu->root_path_cost > p->designated_cost)
311 return 0;
312
313 t = memcmp(&bpdu->bridge_id, &p->designated_bridge, 8);
314 if (t < 0)
315 return 1;
316 else if (t > 0)
317 return 0;
318
319 if (memcmp(&bpdu->bridge_id, &p->br->bridge_id, 8))
320 return 1;
321
322 if (bpdu->port_id <= p->designated_port)
323 return 1;
324
325 return 0;
326}
327
328/* called under bridge lock */
stephen hemminger160d73b2011-07-22 07:47:10 +0000329static void br_topology_change_acknowledged(struct net_bridge *br)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330{
331 br->topology_change_detected = 0;
332 del_timer(&br->tcn_timer);
333}
334
335/* called under bridge lock */
336void br_topology_change_detection(struct net_bridge *br)
337{
338 int isroot = br_is_root_bridge(br);
339
Stephen Hemminger4f0611a2009-05-15 06:11:58 +0000340 if (br->stp_enabled != BR_KERNEL_STP)
341 return;
342
stephen hemminger28a16c92010-05-10 09:31:09 +0000343 br_info(br, "topology change detected, %s\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 isroot ? "propagating" : "sending tcn bpdu");
345
346 if (isroot) {
347 br->topology_change = 1;
348 mod_timer(&br->topology_change_timer, jiffies
349 + br->bridge_forward_delay + br->bridge_max_age);
350 } else if (!br->topology_change_detected) {
351 br_transmit_tcn(br);
352 mod_timer(&br->tcn_timer, jiffies + br->bridge_hello_time);
353 }
354
355 br->topology_change_detected = 1;
356}
357
358/* called under bridge lock */
359void br_config_bpdu_generation(struct net_bridge *br)
360{
361 struct net_bridge_port *p;
362
363 list_for_each_entry(p, &br->port_list, list) {
364 if (p->state != BR_STATE_DISABLED &&
365 br_is_designated_port(p))
366 br_transmit_config(p);
367 }
368}
369
370/* called under bridge lock */
stephen hemminger160d73b2011-07-22 07:47:10 +0000371static void br_reply(struct net_bridge_port *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372{
373 br_transmit_config(p);
374}
375
376/* called under bridge lock */
377void br_configuration_update(struct net_bridge *br)
378{
379 br_root_selection(br);
380 br_designated_port_selection(br);
381}
382
383/* called under bridge lock */
384void br_become_designated_port(struct net_bridge_port *p)
385{
386 struct net_bridge *br;
387
388 br = p->br;
389 p->designated_root = br->designated_root;
390 p->designated_cost = br->root_path_cost;
391 p->designated_bridge = br->bridge_id;
392 p->designated_port = p->port_id;
393}
394
395
396/* called under bridge lock */
397static void br_make_blocking(struct net_bridge_port *p)
398{
399 if (p->state != BR_STATE_DISABLED &&
400 p->state != BR_STATE_BLOCKING) {
401 if (p->state == BR_STATE_FORWARDING ||
402 p->state == BR_STATE_LEARNING)
403 br_topology_change_detection(p->br);
404
Florian Fainelli775dd692014-09-30 16:13:19 -0700405 br_set_state(p, BR_STATE_BLOCKING);
stephen hemminger4ecb9612011-07-22 07:47:09 +0000406 br_ifinfo_notify(RTM_NEWLINK, p);
407
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 del_timer(&p->forward_delay_timer);
409 }
410}
411
412/* called under bridge lock */
413static void br_make_forwarding(struct net_bridge_port *p)
414{
Stephen Hemmingeref647f12008-08-05 18:42:51 -0700415 struct net_bridge *br = p->br;
Stephen Hemminger9cde0702007-03-21 14:22:44 -0700416
Stephen Hemmingeref647f12008-08-05 18:42:51 -0700417 if (p->state != BR_STATE_BLOCKING)
418 return;
419
stephen hemmingera461c022011-03-10 05:57:04 +0000420 if (br->stp_enabled == BR_NO_STP || br->forward_delay == 0) {
Florian Fainelli775dd692014-09-30 16:13:19 -0700421 br_set_state(p, BR_STATE_FORWARDING);
Stephen Hemmingeref647f12008-08-05 18:42:51 -0700422 br_topology_change_detection(br);
423 del_timer(&p->forward_delay_timer);
stephen hemminger160d73b2011-07-22 07:47:10 +0000424 } else if (br->stp_enabled == BR_KERNEL_STP)
Florian Fainelli775dd692014-09-30 16:13:19 -0700425 br_set_state(p, BR_STATE_LISTENING);
Stephen Hemmingeref647f12008-08-05 18:42:51 -0700426 else
Florian Fainelli775dd692014-09-30 16:13:19 -0700427 br_set_state(p, BR_STATE_LEARNING);
Stephen Hemmingeref647f12008-08-05 18:42:51 -0700428
stephen hemminger4ecb9612011-07-22 07:47:09 +0000429 br_ifinfo_notify(RTM_NEWLINK, p);
Stephen Hemmingeref647f12008-08-05 18:42:51 -0700430
431 if (br->forward_delay != 0)
432 mod_timer(&p->forward_delay_timer, jiffies + br->forward_delay);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433}
434
435/* called under bridge lock */
436void br_port_state_selection(struct net_bridge *br)
437{
438 struct net_bridge_port *p;
stephen hemminger1faa4352011-03-07 08:34:06 +0000439 unsigned int liveports = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440
441 list_for_each_entry(p, &br->port_list, list) {
stephen hemminger1faa4352011-03-07 08:34:06 +0000442 if (p->state == BR_STATE_DISABLED)
443 continue;
444
Vitalii Demianetsb03b6dd2011-11-25 00:16:37 +0000445 /* Don't change port states if userspace is handling STP */
446 if (br->stp_enabled != BR_USER_STP) {
447 if (p->port_no == br->root_port) {
448 p->config_pending = 0;
449 p->topology_change_ack = 0;
450 br_make_forwarding(p);
451 } else if (br_is_designated_port(p)) {
452 del_timer(&p->message_age_timer);
453 br_make_forwarding(p);
454 } else {
455 p->config_pending = 0;
456 p->topology_change_ack = 0;
457 br_make_blocking(p);
458 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 }
460
Nikolay Aleksandrov7ce42de2015-06-19 01:45:50 -0700461 if (p->state != BR_STATE_BLOCKING)
462 br_multicast_enable_port(p);
Nikolay Aleksandrov9aa66382015-06-23 04:47:44 -0700463 /* Multicast is not disabled for the port when it goes in
464 * blocking state because the timers will expire and stop by
465 * themselves without sending more queries.
466 */
stephen hemminger1faa4352011-03-07 08:34:06 +0000467 if (p->state == BR_STATE_FORWARDING)
468 ++liveports;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 }
stephen hemminger1faa4352011-03-07 08:34:06 +0000470
471 if (liveports == 0)
472 netif_carrier_off(br->dev);
473 else
474 netif_carrier_on(br->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475}
476
477/* called under bridge lock */
stephen hemminger160d73b2011-07-22 07:47:10 +0000478static void br_topology_change_acknowledge(struct net_bridge_port *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479{
480 p->topology_change_ack = 1;
481 br_transmit_config(p);
482}
483
484/* called under bridge lock */
stephen hemminger160d73b2011-07-22 07:47:10 +0000485void br_received_config_bpdu(struct net_bridge_port *p,
486 const struct br_config_bpdu *bpdu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487{
488 struct net_bridge *br;
489 int was_root;
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900490
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 br = p->br;
492 was_root = br_is_root_bridge(br);
493
494 if (br_supersedes_port_info(p, bpdu)) {
495 br_record_config_information(p, bpdu);
496 br_configuration_update(br);
497 br_port_state_selection(br);
498
499 if (!br_is_root_bridge(br) && was_root) {
500 del_timer(&br->hello_timer);
501 if (br->topology_change_detected) {
502 del_timer(&br->topology_change_timer);
503 br_transmit_tcn(br);
504
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900505 mod_timer(&br->tcn_timer,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 jiffies + br->bridge_hello_time);
507 }
508 }
509
510 if (p->port_no == br->root_port) {
511 br_record_config_timeout_values(br, bpdu);
512 br_config_bpdu_generation(br);
513 if (bpdu->topology_change_ack)
514 br_topology_change_acknowledged(br);
515 }
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900516 } else if (br_is_designated_port(p)) {
517 br_reply(p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 }
519}
520
521/* called under bridge lock */
522void br_received_tcn_bpdu(struct net_bridge_port *p)
523{
524 if (br_is_designated_port(p)) {
stephen hemminger28a16c92010-05-10 09:31:09 +0000525 br_info(p->br, "port %u(%s) received tcn bpdu\n",
Eric Dumazet95c96172012-04-15 05:58:06 +0000526 (unsigned int) p->port_no, p->dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527
528 br_topology_change_detection(p->br);
529 br_topology_change_acknowledge(p);
530 }
531}
stephen hemminger14f98f22011-04-04 14:03:33 +0000532
533/* Change bridge STP parameter */
534int br_set_hello_time(struct net_bridge *br, unsigned long val)
535{
536 unsigned long t = clock_t_to_jiffies(val);
537
538 if (t < BR_MIN_HELLO_TIME || t > BR_MAX_HELLO_TIME)
539 return -ERANGE;
540
541 spin_lock_bh(&br->lock);
542 br->bridge_hello_time = t;
543 if (br_is_root_bridge(br))
544 br->hello_time = br->bridge_hello_time;
545 spin_unlock_bh(&br->lock);
546 return 0;
547}
548
549int br_set_max_age(struct net_bridge *br, unsigned long val)
550{
551 unsigned long t = clock_t_to_jiffies(val);
552
553 if (t < BR_MIN_MAX_AGE || t > BR_MAX_MAX_AGE)
554 return -ERANGE;
555
556 spin_lock_bh(&br->lock);
557 br->bridge_max_age = t;
558 if (br_is_root_bridge(br))
559 br->max_age = br->bridge_max_age;
560 spin_unlock_bh(&br->lock);
561 return 0;
562
563}
564
Stephen Hemminger4c656c12016-03-08 12:59:35 -0800565/* Set time interval that dynamic forwarding entries live
566 * For pure software bridge, allow values outside the 802.1
567 * standard specification for special cases:
568 * 0 - entry never ages (all permanant)
569 * 1 - entry disappears (no persistance)
570 *
571 * Offloaded switch entries maybe more restrictive
572 */
Scott Feldmanc62987b2015-10-08 19:23:19 -0700573int br_set_ageing_time(struct net_bridge *br, u32 ageing_time)
574{
575 struct switchdev_attr attr = {
Ido Schimmel6ff64f62015-12-15 16:03:35 +0100576 .orig_dev = br->dev,
Scott Feldmanc62987b2015-10-08 19:23:19 -0700577 .id = SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME,
578 .flags = SWITCHDEV_F_SKIP_EOPNOTSUPP,
579 .u.ageing_time = ageing_time,
580 };
581 unsigned long t = clock_t_to_jiffies(ageing_time);
582 int err;
583
Scott Feldmanc62987b2015-10-08 19:23:19 -0700584 err = switchdev_port_attr_set(br->dev, &attr);
Haishuang Yan5e263f72016-03-29 18:48:08 +0800585 if (err && err != -EOPNOTSUPP)
Scott Feldmanc62987b2015-10-08 19:23:19 -0700586 return err;
587
588 br->ageing_time = t;
589 mod_timer(&br->gc_timer, jiffies);
590
591 return 0;
592}
593
Herbert Xube4f1542013-09-12 17:12:05 +1000594void __br_set_forward_delay(struct net_bridge *br, unsigned long t)
stephen hemminger14f98f22011-04-04 14:03:33 +0000595{
stephen hemminger14f98f22011-04-04 14:03:33 +0000596 br->bridge_forward_delay = t;
597 if (br_is_root_bridge(br))
598 br->forward_delay = br->bridge_forward_delay;
Herbert Xube4f1542013-09-12 17:12:05 +1000599}
600
601int br_set_forward_delay(struct net_bridge *br, unsigned long val)
602{
603 unsigned long t = clock_t_to_jiffies(val);
Vlad Yasevich8a921262015-11-10 06:15:32 -0500604 int err = -ERANGE;
Herbert Xube4f1542013-09-12 17:12:05 +1000605
606 spin_lock_bh(&br->lock);
Vlad Yasevich8a921262015-11-10 06:15:32 -0500607 if (br->stp_enabled != BR_NO_STP &&
608 (t < BR_MIN_FORWARD_DELAY || t > BR_MAX_FORWARD_DELAY))
609 goto unlock;
610
Herbert Xube4f1542013-09-12 17:12:05 +1000611 __br_set_forward_delay(br, t);
Vlad Yasevich8a921262015-11-10 06:15:32 -0500612 err = 0;
613
614unlock:
stephen hemminger14f98f22011-04-04 14:03:33 +0000615 spin_unlock_bh(&br->lock);
Vlad Yasevich8a921262015-11-10 06:15:32 -0500616 return err;
stephen hemminger14f98f22011-04-04 14:03:33 +0000617}