summaryrefslogtreecommitdiffstats
path: root/net/dsa/switch.c
blob: 4b5da89dc27a25cc37787646690c0b9dcee8fb80 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Handling of a single switch chip, part of a switch fabric
 *
 * Copyright (c) 2017 Savoir-faire Linux Inc.
 *	Vivien Didelot <vivien.didelot@savoirfairelinux.com>
 */

#include <linux/if_bridge.h>
#include <linux/netdevice.h>
#include <linux/notifier.h>
#include <linux/if_vlan.h>
#include <net/switchdev.h>

#include "dsa_priv.h"

static unsigned int dsa_switch_fastest_ageing_time(struct dsa_switch *ds,
						   unsigned int ageing_time)
{
	int i;

	for (i = 0; i < ds->num_ports; ++i) {
		struct dsa_port *dp = dsa_to_port(ds, i);

		if (dp->ageing_time && dp->ageing_time < ageing_time)
			ageing_time = dp->ageing_time;
	}

	return ageing_time;
}

static int dsa_switch_ageing_time(struct dsa_switch *ds,
				  struct dsa_notifier_ageing_time_info *info)
{
	unsigned int ageing_time = info->ageing_time;

	if (ds->ageing_time_min && ageing_time < ds->ageing_time_min)
		return -ERANGE;

	if (ds->ageing_time_max && ageing_time > ds->ageing_time_max)
		return -ERANGE;

	/* Program the fastest ageing time in case of multiple bridges */
	ageing_time = dsa_switch_fastest_ageing_time(ds, ageing_time);

	if (ds->ops->set_ageing_time)
		return ds->ops->set_ageing_time(ds, ageing_time);

	return 0;
}

static bool dsa_switch_mtu_match(struct dsa_switch *ds, int port,
				 struct dsa_notifier_mtu_info *info)
{
	if (ds->index == info->sw_index)
		return (port == info->port) || dsa_is_dsa_port(ds, port);

	if (!info->propagate_upstream)
		return false;

	if (dsa_is_dsa_port(ds, port) || dsa_is_cpu_port(ds, port))
		return true;

	return false;
}

static int dsa_switch_mtu(struct dsa_switch *ds,
			  struct dsa_notifier_mtu_info *info)
{
	int port, ret;

	if (!ds->ops->port_change_mtu)
		return -EOPNOTSUPP;

	for (port = 0; port < ds->num_ports; port++) {
		if (dsa_switch_mtu_match(ds, port, info)) {
			ret = ds->ops->port_change_mtu(ds, port, info->mtu);
			if (ret)
				return ret;
		}
	}

	return 0;
}

static int dsa_switch_bridge_join(struct dsa_switch *ds,
				  struct dsa_notifier_bridge_info *info)
{
	struct dsa_switch_tree *dst = ds->dst;

	if (dst->index == info->tree_index && ds->index == info->sw_index &&
	    ds->ops->port_bridge_join)
		return ds->ops->port_bridge_join(ds, info->port, info->br);

	if ((dst->index != info->tree_index || ds->index != info->sw_index) &&
	    ds->ops->crosschip_bridge_join)
		return ds->ops->crosschip_bridge_join(ds, info->tree_index,
						      info->sw_index,
						      info->port, info->br);

	return 0;
}

static int dsa_switch_bridge_leave(struct dsa_switch *ds,
				   struct dsa_notifier_bridge_info *info)
{
	bool unset_vlan_filtering = br_vlan_enabled(info->br);
	struct dsa_switch_tree *dst = ds->dst;
	struct netlink_ext_ack extack = {0};
	int err, i;

	if (dst->index == info->tree_index && ds->index == info->sw_index &&
	    ds->ops->port_bridge_join)
		ds->ops->port_bridge_leave(ds, info->port, info->br);

	if ((dst->index != info->tree_index || ds->index != info->sw_index) &&
	    ds->ops->crosschip_bridge_join)
		ds->ops->crosschip_bridge_leave(ds, info->tree_index,
						info->sw_index, info->port,
						info->br);

	/* If the bridge was vlan_filtering, the bridge core doesn't trigger an
	 * event for changing vlan_filtering setting upon slave ports leaving
	 * it. That is a good thing, because that lets us handle it and also
	 * handle the case where the switch's vlan_filtering setting is global
	 * (not per port). When that happens, the correct moment to trigger the
	 * vlan_filtering callback is only when the last port left this bridge.
	 */
	if (unset_vlan_filtering && ds->vlan_filtering_is_global) {
		for (i = 0; i < ds->num_ports; i++) {
			if (i == info->port)
				continue;
			if (dsa_to_port(ds, i)->bridge_dev == info->br) {
				unset_vlan_filtering = false;
				break;
			}
		}
	}
	if (unset_vlan_filtering) {
		err = dsa_port_vlan_filtering(dsa_to_port(ds, info->port),
					      false, &extack);
		if (extack._msg)
			dev_err(ds->dev, "port %d: %s\n", info->port,
				extack._msg);
		if (err && err != EOPNOTSUPP)
			return err;
	}
	return 0;
}

static int dsa_switch_fdb_add(struct dsa_switch *ds,
			      struct dsa_notifier_fdb_info *info)
{
	int port = dsa_towards_port(ds, info->sw_index, info->port);

	if (!ds->ops->port_fdb_add)
		return -EOPNOTSUPP;

	return ds->ops->port_fdb_add(ds, port, info->addr, info->vid);
}

static int dsa_switch_fdb_del(struct dsa_switch *ds,
			      struct dsa_notifier_fdb_info *info)
{
	int port = dsa_towards_port(ds, info->sw_index, info->port);

	if (!ds->ops->port_fdb_del)
		return -EOPNOTSUPP;

	return ds->ops->port_fdb_del(ds, port, info->addr, info->vid);
}

static int dsa_switch_hsr_join(struct dsa_switch *ds,
			       struct dsa_notifier_hsr_info *info)
{
	if (ds->index == info->sw_index && ds->ops->port_hsr_join)
		return ds->ops->port_hsr_join(ds, info->port, info->hsr);

	return -EOPNOTSUPP;
}

static int dsa_switch_hsr_leave(struct dsa_switch *ds,
				struct dsa_notifier_hsr_info *info)
{
	if (ds->index == info->sw_index && ds->ops->port_hsr_leave)
		return ds->ops->port_hsr_leave(ds, info->port, info->hsr);

	return -EOPNOTSUPP;
}

static int dsa_switch_lag_change(struct dsa_switch *ds,
				 struct dsa_notifier_lag_info *info)
{
	if (ds->index == info->sw_index && ds->ops->port_lag_change)
		return ds->ops->port_lag_change(ds, info->port);

	if (ds->index != info->sw_index && ds->ops->crosschip_lag_change)
		return ds->ops->crosschip_lag_change(ds, info->sw_index,
						     info->port);

	return 0;
}

static int dsa_switch_lag_join(struct dsa_switch *ds,
			       struct dsa_notifier_lag_info *info)
{
	if (ds->index == info->sw_index && ds->ops->port_lag_join)
		return ds->ops->port_lag_join(ds, info->port, info->lag,
					      info->info);

	if (ds->index != info->sw_index && ds->ops->crosschip_lag_join)
		return ds->ops->crosschip_lag_join(ds, info->sw_index,
						   info->port, info->lag,
						   info->info);

	return 0;
}

static int dsa_switch_lag_leave(struct dsa_switch *ds,
				struct dsa_notifier_lag_info *info)
{
	if (ds->index == info->sw_index && ds->ops->port_lag_leave)
		return ds->ops->port_lag_leave(ds, info->port, info->lag);

	if (ds->index != info->sw_index && ds->ops->crosschip_lag_leave)
		return ds->ops->crosschip_lag_leave(ds, info->sw_index,
						    info->port, info->lag);

	return 0;
}

static bool dsa_switch_mdb_match(struct dsa_switch *ds, int port,
				 struct dsa_notifier_mdb_info *info)
{
	if (ds->index == info->sw_index && port == info->port)
		return true;

	if (dsa_is_dsa_port(ds, port))
		return true;

	return false;
}

static int dsa_switch_mdb_add(struct dsa_switch *ds,
			      struct dsa_notifier_mdb_info *info)
{
	int err = 0;
	int port;

	if (!ds->ops->port_mdb_add)
		return -EOPNOTSUPP;

	for (port = 0; port < ds->num_ports; port++) {
		if (dsa_switch_mdb_match(ds, port, info)) {
			err = ds->ops->port_mdb_add(ds, port, info->mdb);
			if (err)
				break;
		}
	}

	return err;
}

static int dsa_switch_mdb_del(struct dsa_switch *ds,
			      struct dsa_notifier_mdb_info *info)
{
	if (!ds->ops->port_mdb_del)
		return -EOPNOTSUPP;

	if (ds->index == info->sw_index)
		return ds->ops->port_mdb_del(ds, info->port, info->mdb);

	return 0;
}

static bool dsa_switch_vlan_match(struct dsa_switch *ds, int port,
				  struct dsa_notifier_vlan_info *info)
{
	if (ds->index == info->sw_index && port == info->port)
		return true;

	if (dsa_is_dsa_port(ds, port))
		return true;

	return false;
}

static int dsa_switch_vlan_add(struct dsa_switch *ds,
			       struct dsa_notifier_vlan_info *info)
{
	int port, err;

	if (!ds->ops->port_vlan_add)
		return -EOPNOTSUPP;

	for (port = 0; port < ds->num_ports; port++) {
		if (dsa_switch_vlan_match(ds, port, info)) {
			err = ds->ops->port_vlan_add(ds, port, info->vlan,
						     info->extack);
			if (err)
				return err;
		}
	}

	return 0;
}

static int dsa_switch_vlan_del(struct dsa_switch *ds,
			       struct dsa_notifier_vlan_info *info)
{
	if (!ds->ops->port_vlan_del)
		return -EOPNOTSUPP;

	if (ds->index == info->sw_index)
		return ds->ops->port_vlan_del(ds, info->port, info->vlan);

	/* Do not deprogram the DSA links as they may be used as conduit
	 * for other VLAN members in the fabric.
	 */
	return 0;
}

static bool dsa_switch_tag_proto_match(struct dsa_switch *ds, int port,
				       struct dsa_notifier_tag_proto_info *info)
{
	if (dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port))
		return true;

	return false;
}

static int dsa_switch_change_tag_proto(struct dsa_switch *ds,
				       struct dsa_notifier_tag_proto_info *info)
{
	const struct dsa_device_ops *tag_ops = info->tag_ops;
	int port, err;

	if (!ds->ops->change_tag_protocol)
		return -EOPNOTSUPP;

	ASSERT_RTNL();

	for (port = 0; port < ds->num_ports; port++) {
		if (dsa_switch_tag_proto_match(ds, port, info)) {
			err = ds->ops->change_tag_protocol(ds, port,
							   tag_ops->proto);
			if (err)
				return err;

			if (dsa_is_cpu_port(ds, port))
				dsa_port_set_tag_protocol(dsa_to_port(ds, port),
							  tag_ops);
		}
	}

	/* Now that changing the tag protocol can no longer fail, let's update
	 * the remaining bits which are "duplicated for faster access", and the
	 * bits that depend on the tagger, such as the MTU.
	 */
	for (port = 0; port < ds->num_ports; port++) {
		if (dsa_is_user_port(ds, port)) {
			struct net_device *slave;

			slave = dsa_to_port(ds, port)->slave;
			dsa_slave_setup_tagger(slave);

			/* rtnl_mutex is held in dsa_tree_change_tag_proto */
			dsa_slave_change_mtu(slave, slave->mtu);
		}
	}

	return 0;
}

static bool dsa_switch_mrp_match(struct dsa_switch *ds, int port,
				 struct dsa_notifier_mrp_info *info)
{
	if (ds->index == info->sw_index && port == info->port)
		return true;

	if (dsa_is_dsa_port(ds, port))
		return true;

	return false;
}

static int dsa_switch_mrp_add(struct dsa_switch *ds,
			      struct dsa_notifier_mrp_info *info)
{
	int err = 0;
	int port;

	if (!ds->ops->port_mrp_add)
		return -EOPNOTSUPP;

	for (port = 0; port < ds->num_ports; port++) {
		if (dsa_switch_mrp_match(ds, port, info)) {
			err = ds->ops->port_mrp_add(ds, port, info->mrp);
			if (err)
				break;
		}
	}

	return err;
}

static int dsa_switch_mrp_del(struct dsa_switch *ds,
			      struct dsa_notifier_mrp_info *info)
{
	if (!ds->ops->port_mrp_del)
		return -EOPNOTSUPP;

	if (ds->index == info->sw_index)
		return ds->ops->port_mrp_del(ds, info->port, info->mrp);

	return 0;
}

static bool
dsa_switch_mrp_ring_role_match(struct dsa_switch *ds, int port,
			       struct dsa_notifier_mrp_ring_role_info *info)
{
	if (ds->index == info->sw_index && port == info->port)
		return true;

	if (dsa_is_dsa_port(ds, port))
		return true;

	return false;
}

static int
dsa_switch_mrp_add_ring_role(struct dsa_switch *ds,
			     struct dsa_notifier_mrp_ring_role_info *info)
{
	int err = 0;
	int port;

	if (!ds->ops->port_mrp_add)
		return -EOPNOTSUPP;

	for (port = 0; port < ds->num_ports; port++) {
		if (dsa_switch_mrp_ring_role_match(ds, port, info)) {
			err = ds->ops->port_mrp_add_ring_role(ds, port,
							      info->mrp);
			if (err)
				break;
		}
	}

	return err;
}

static int
dsa_switch_mrp_del_ring_role(struct dsa_switch *ds,
			     struct dsa_notifier_mrp_ring_role_info *info)
{
	if (!ds->ops->port_mrp_del)
		return -EOPNOTSUPP;

	if (ds->index == info->sw_index)
		return ds->ops->port_mrp_del_ring_role(ds, info->port,
						       info->mrp);

	return 0;
}

static int dsa_switch_event(struct notifier_block *nb,
			    unsigned long event, void *info)
{
	struct dsa_switch *ds = container_of(nb, struct dsa_switch, nb);
	int err;

	switch (event) {
	case DSA_NOTIFIER_AGEING_TIME:
		err = dsa_switch_ageing_time(ds, info);
		break;
	case DSA_NOTIFIER_BRIDGE_JOIN:
		err = dsa_switch_bridge_join(ds, info);
		break;
	case DSA_NOTIFIER_BRIDGE_LEAVE:
		err = dsa_switch_bridge_leave(ds, info);
		break;
	case DSA_NOTIFIER_FDB_ADD:
		err = dsa_switch_fdb_add(ds, info);
		break;
	case DSA_NOTIFIER_FDB_DEL:
		err = dsa_switch_fdb_del(ds, info);
		break;
	case DSA_NOTIFIER_HSR_JOIN:
		err = dsa_switch_hsr_join(ds, info);
		break;
	case DSA_NOTIFIER_HSR_LEAVE:
		err = dsa_switch_hsr_leave(ds, info);
		break;
	case DSA_NOTIFIER_LAG_CHANGE:
		err = dsa_switch_lag_change(ds, info);
		break;
	case DSA_NOTIFIER_LAG_JOIN:
		err = dsa_switch_lag_join(ds, info);
		break;
	case DSA_NOTIFIER_LAG_LEAVE:
		err = dsa_switch_lag_leave(ds, info);
		break;
	case DSA_NOTIFIER_MDB_ADD:
		err = dsa_switch_mdb_add(ds, info);
		break;
	case DSA_NOTIFIER_MDB_DEL:
		err = dsa_switch_mdb_del(ds, info);
		break;
	case DSA_NOTIFIER_VLAN_ADD:
		err = dsa_switch_vlan_add(ds, info);
		break;
	case DSA_NOTIFIER_VLAN_DEL:
		err = dsa_switch_vlan_del(ds, info);
		break;
	case DSA_NOTIFIER_MTU:
		err = dsa_switch_mtu(ds, info);
		break;
	case DSA_NOTIFIER_TAG_PROTO:
		err = dsa_switch_change_tag_proto(ds, info);
		break;
	case DSA_NOTIFIER_MRP_ADD:
		err = dsa_switch_mrp_add(ds, info);
		break;
	case DSA_NOTIFIER_MRP_DEL:
		err = dsa_switch_mrp_del(ds, info);
		break;
	case DSA_NOTIFIER_MRP_ADD_RING_ROLE:
		err = dsa_switch_mrp_add_ring_role(ds, info);
		break;
	case DSA_NOTIFIER_MRP_DEL_RING_ROLE:
		err = dsa_switch_mrp_del_ring_role(ds, info);
		break;
	default:
		err = -EOPNOTSUPP;
		break;
	}

	if (err)
		dev_dbg(ds->dev, "breaking chain for DSA event %lu (%d)\n",
			event, err);

	return notifier_from_errno(err);
}

int dsa_switch_register_notifier(struct dsa_switch *ds)
{
	ds->nb.notifier_call = dsa_switch_event;

	return raw_notifier_chain_register(&ds->dst->nh, &ds->nb);
}

void dsa_switch_unregister_notifier(struct dsa_switch *ds)
{
	int err;

	err = raw_notifier_chain_unregister(&ds->dst->nh, &ds->nb);
	if (err)
		dev_err(ds->dev, "failed to unregister notifier (%d)\n", err);
}