summaryrefslogtreecommitdiffstats
path: root/net/dsa/switch.c
blob: 3fb362b6874e3640f2867e0ba1ef872e3c36740b (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
// 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;
	struct switchdev_trans *trans = info->trans;

	if (switchdev_trans_ph_prepare(trans)) {
		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;
		return 0;
	}

	/* 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;
	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) {
		struct switchdev_trans trans;

		trans.ph_prepare = true;
		err = dsa_port_vlan_filtering(dsa_to_port(ds, info->port),
					      false, &trans);
		if (err && err != EOPNOTSUPP)
			return err;

		trans.ph_prepare = false;
		err = dsa_port_vlan_filtering(dsa_to_port(ds, info->port),
					      false, &trans);
		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 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_prepare(struct dsa_switch *ds,
				  struct dsa_notifier_mdb_info *info)
{
	int port, err;

	if (!ds->ops->port_mdb_prepare || !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_prepare(ds, port, info->mdb);
			if (err)
				return err;
		}
	}

	return 0;
}

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

	if (switchdev_trans_ph_prepare(info->trans))
		return dsa_switch_mdb_prepare(ds, info);

	if (!ds->ops->port_mdb_add)
		return 0;

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

	return 0;
}

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

	if (!ds->ops->port_vlan_prepare || !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_prepare(ds, port, info->vlan);
			if (err)
				return err;
		}
	}

	return 0;
}

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

	if (switchdev_trans_ph_prepare(info->trans))
		return dsa_switch_vlan_prepare(ds, info);

	if (!ds->ops->port_vlan_add)
		return 0;

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

	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 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_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;
	default:
		err = -EOPNOTSUPP;
		break;
	}

	/* Non-switchdev operations cannot be rolled back. If a DSA driver
	 * returns an error during the chained call, switch chips may be in an
	 * inconsistent state.
	 */
	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);
}