summaryrefslogtreecommitdiffstats
path: root/net/switchdev/switchdev.c
blob: 46568b85c3339f57a0d6835e82eff4b67c3ba326 (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
/*
 * net/switchdev/switchdev.c - Switch device API
 * Copyright (c) 2014 Jiri Pirko <jiri@resnulli.us>
 * Copyright (c) 2014-2015 Scott Feldman <sfeldma@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/mutex.h>
#include <linux/notifier.h>
#include <linux/netdevice.h>
#include <net/ip_fib.h>
#include <net/switchdev.h>

/**
 *	netdev_switch_parent_id_get - Get ID of a switch
 *	@dev: port device
 *	@psid: switch ID
 *
 *	Get ID of a switch this port is part of.
 */
int netdev_switch_parent_id_get(struct net_device *dev,
				struct netdev_phys_item_id *psid)
{
	const struct swdev_ops *ops = dev->swdev_ops;

	if (!ops || !ops->swdev_parent_id_get)
		return -EOPNOTSUPP;
	return ops->swdev_parent_id_get(dev, psid);
}
EXPORT_SYMBOL_GPL(netdev_switch_parent_id_get);

/**
 *	netdev_switch_port_stp_update - Notify switch device port of STP
 *					state change
 *	@dev: port device
 *	@state: port STP state
 *
 *	Notify switch device port of bridge port STP state change.
 */
int netdev_switch_port_stp_update(struct net_device *dev, u8 state)
{
	const struct swdev_ops *ops = dev->swdev_ops;
	struct net_device *lower_dev;
	struct list_head *iter;
	int err = -EOPNOTSUPP;

	if (ops && ops->swdev_port_stp_update)
		return ops->swdev_port_stp_update(dev, state);

	netdev_for_each_lower_dev(dev, lower_dev, iter) {
		err = netdev_switch_port_stp_update(lower_dev, state);
		if (err && err != -EOPNOTSUPP)
			return err;
	}

	return err;
}
EXPORT_SYMBOL_GPL(netdev_switch_port_stp_update);

static DEFINE_MUTEX(netdev_switch_mutex);
static RAW_NOTIFIER_HEAD(netdev_switch_notif_chain);

/**
 *	register_netdev_switch_notifier - Register notifier
 *	@nb: notifier_block
 *
 *	Register switch device notifier. This should be used by code
 *	which needs to monitor events happening in particular device.
 *	Return values are same as for atomic_notifier_chain_register().
 */
int register_netdev_switch_notifier(struct notifier_block *nb)
{
	int err;

	mutex_lock(&netdev_switch_mutex);
	err = raw_notifier_chain_register(&netdev_switch_notif_chain, nb);
	mutex_unlock(&netdev_switch_mutex);
	return err;
}
EXPORT_SYMBOL_GPL(register_netdev_switch_notifier);

/**
 *	unregister_netdev_switch_notifier - Unregister notifier
 *	@nb: notifier_block
 *
 *	Unregister switch device notifier.
 *	Return values are same as for atomic_notifier_chain_unregister().
 */
int unregister_netdev_switch_notifier(struct notifier_block *nb)
{
	int err;

	mutex_lock(&netdev_switch_mutex);
	err = raw_notifier_chain_unregister(&netdev_switch_notif_chain, nb);
	mutex_unlock(&netdev_switch_mutex);
	return err;
}
EXPORT_SYMBOL_GPL(unregister_netdev_switch_notifier);

/**
 *	call_netdev_switch_notifiers - Call notifiers
 *	@val: value passed unmodified to notifier function
 *	@dev: port device
 *	@info: notifier information data
 *
 *	Call all network notifier blocks. This should be called by driver
 *	when it needs to propagate hardware event.
 *	Return values are same as for atomic_notifier_call_chain().
 */
int call_netdev_switch_notifiers(unsigned long val, struct net_device *dev,
				 struct netdev_switch_notifier_info *info)
{
	int err;

	info->dev = dev;
	mutex_lock(&netdev_switch_mutex);
	err = raw_notifier_call_chain(&netdev_switch_notif_chain, val, info);
	mutex_unlock(&netdev_switch_mutex);
	return err;
}
EXPORT_SYMBOL_GPL(call_netdev_switch_notifiers);

/**
 *	netdev_switch_port_bridge_setlink - Notify switch device port of bridge
 *	port attributes
 *
 *	@dev: port device
 *	@nlh: netlink msg with bridge port attributes
 *	@flags: bridge setlink flags
 *
 *	Notify switch device port of bridge port attributes
 */
int netdev_switch_port_bridge_setlink(struct net_device *dev,
				      struct nlmsghdr *nlh, u16 flags)
{
	const struct net_device_ops *ops = dev->netdev_ops;

	if (!(dev->features & NETIF_F_HW_SWITCH_OFFLOAD))
		return 0;

	if (!ops->ndo_bridge_setlink)
		return -EOPNOTSUPP;

	return ops->ndo_bridge_setlink(dev, nlh, flags);
}
EXPORT_SYMBOL_GPL(netdev_switch_port_bridge_setlink);

/**
 *	netdev_switch_port_bridge_dellink - Notify switch device port of bridge
 *	port attribute delete
 *
 *	@dev: port device
 *	@nlh: netlink msg with bridge port attributes
 *	@flags: bridge setlink flags
 *
 *	Notify switch device port of bridge port attribute delete
 */
int netdev_switch_port_bridge_dellink(struct net_device *dev,
				      struct nlmsghdr *nlh, u16 flags)
{
	const struct net_device_ops *ops = dev->netdev_ops;

	if (!(dev->features & NETIF_F_HW_SWITCH_OFFLOAD))
		return 0;

	if (!ops->ndo_bridge_dellink)
		return -EOPNOTSUPP;

	return ops->ndo_bridge_dellink(dev, nlh, flags);
}
EXPORT_SYMBOL_GPL(netdev_switch_port_bridge_dellink);

/**
 *	ndo_dflt_netdev_switch_port_bridge_setlink - default ndo bridge setlink
 *						     op for master devices
 *
 *	@dev: port device
 *	@nlh: netlink msg with bridge port attributes
 *	@flags: bridge setlink flags
 *
 *	Notify master device slaves of bridge port attributes
 */
int ndo_dflt_netdev_switch_port_bridge_setlink(struct net_device *dev,
					       struct nlmsghdr *nlh, u16 flags)
{
	struct net_device *lower_dev;
	struct list_head *iter;
	int ret = 0, err = 0;

	if (!(dev->features & NETIF_F_HW_SWITCH_OFFLOAD))
		return ret;

	netdev_for_each_lower_dev(dev, lower_dev, iter) {
		err = netdev_switch_port_bridge_setlink(lower_dev, nlh, flags);
		if (err && err != -EOPNOTSUPP)
			ret = err;
	}

	return ret;
}
EXPORT_SYMBOL_GPL(ndo_dflt_netdev_switch_port_bridge_setlink);

/**
 *	ndo_dflt_netdev_switch_port_bridge_dellink - default ndo bridge dellink
 *						     op for master devices
 *
 *	@dev: port device
 *	@nlh: netlink msg with bridge port attributes
 *	@flags: bridge dellink flags
 *
 *	Notify master device slaves of bridge port attribute deletes
 */
int ndo_dflt_netdev_switch_port_bridge_dellink(struct net_device *dev,
					       struct nlmsghdr *nlh, u16 flags)
{
	struct net_device *lower_dev;
	struct list_head *iter;
	int ret = 0, err = 0;

	if (!(dev->features & NETIF_F_HW_SWITCH_OFFLOAD))
		return ret;

	netdev_for_each_lower_dev(dev, lower_dev, iter) {
		err = netdev_switch_port_bridge_dellink(lower_dev, nlh, flags);
		if (err && err != -EOPNOTSUPP)
			ret = err;
	}

	return ret;
}
EXPORT_SYMBOL_GPL(ndo_dflt_netdev_switch_port_bridge_dellink);

static struct net_device *netdev_switch_get_lowest_dev(struct net_device *dev)
{
	const struct swdev_ops *ops = dev->swdev_ops;
	struct net_device *lower_dev;
	struct net_device *port_dev;
	struct list_head *iter;

	/* Recusively search down until we find a sw port dev.
	 * (A sw port dev supports swdev_parent_id_get).
	 */

	if (dev->features & NETIF_F_HW_SWITCH_OFFLOAD &&
	    ops && ops->swdev_parent_id_get)
		return dev;

	netdev_for_each_lower_dev(dev, lower_dev, iter) {
		port_dev = netdev_switch_get_lowest_dev(lower_dev);
		if (port_dev)
			return port_dev;
	}

	return NULL;
}

static struct net_device *netdev_switch_get_dev_by_nhs(struct fib_info *fi)
{
	struct netdev_phys_item_id psid;
	struct netdev_phys_item_id prev_psid;
	struct net_device *dev = NULL;
	int nhsel;

	/* For this route, all nexthop devs must be on the same switch. */

	for (nhsel = 0; nhsel < fi->fib_nhs; nhsel++) {
		const struct fib_nh *nh = &fi->fib_nh[nhsel];

		if (!nh->nh_dev)
			return NULL;

		dev = netdev_switch_get_lowest_dev(nh->nh_dev);
		if (!dev)
			return NULL;

		if (netdev_switch_parent_id_get(dev, &psid))
			return NULL;

		if (nhsel > 0) {
			if (prev_psid.id_len != psid.id_len)
				return NULL;
			if (memcmp(prev_psid.id, psid.id, psid.id_len))
				return NULL;
		}

		prev_psid = psid;
	}

	return dev;
}

/**
 *	netdev_switch_fib_ipv4_add - Add IPv4 route entry to switch
 *
 *	@dst: route's IPv4 destination address
 *	@dst_len: destination address length (prefix length)
 *	@fi: route FIB info structure
 *	@tos: route TOS
 *	@type: route type
 *	@nlflags: netlink flags passed in (NLM_F_*)
 *	@tb_id: route table ID
 *
 *	Add IPv4 route entry to switch device.
 */
int netdev_switch_fib_ipv4_add(u32 dst, int dst_len, struct fib_info *fi,
			       u8 tos, u8 type, u32 nlflags, u32 tb_id)
{
	struct net_device *dev;
	const struct swdev_ops *ops;
	int err = 0;

	/* Don't offload route if using custom ip rules or if
	 * IPv4 FIB offloading has been disabled completely.
	 */

#ifdef CONFIG_IP_MULTIPLE_TABLES
	if (fi->fib_net->ipv4.fib_has_custom_rules)
		return 0;
#endif

	if (fi->fib_net->ipv4.fib_offload_disabled)
		return 0;

	dev = netdev_switch_get_dev_by_nhs(fi);
	if (!dev)
		return 0;
	ops = dev->swdev_ops;

	if (ops->swdev_fib_ipv4_add) {
		err = ops->swdev_fib_ipv4_add(dev, htonl(dst), dst_len,
					      fi, tos, type, nlflags,
					      tb_id);
		if (!err)
			fi->fib_flags |= RTNH_F_EXTERNAL;
	}

	return err;
}
EXPORT_SYMBOL_GPL(netdev_switch_fib_ipv4_add);

/**
 *	netdev_switch_fib_ipv4_del - Delete IPv4 route entry from switch
 *
 *	@dst: route's IPv4 destination address
 *	@dst_len: destination address length (prefix length)
 *	@fi: route FIB info structure
 *	@tos: route TOS
 *	@type: route type
 *	@tb_id: route table ID
 *
 *	Delete IPv4 route entry from switch device.
 */
int netdev_switch_fib_ipv4_del(u32 dst, int dst_len, struct fib_info *fi,
			       u8 tos, u8 type, u32 tb_id)
{
	struct net_device *dev;
	const struct swdev_ops *ops;
	int err = 0;

	if (!(fi->fib_flags & RTNH_F_EXTERNAL))
		return 0;

	dev = netdev_switch_get_dev_by_nhs(fi);
	if (!dev)
		return 0;
	ops = dev->swdev_ops;

	if (ops->swdev_fib_ipv4_del) {
		err = ops->swdev_fib_ipv4_del(dev, htonl(dst), dst_len,
					      fi, tos, type, tb_id);
		if (!err)
			fi->fib_flags &= ~RTNH_F_EXTERNAL;
	}

	return err;
}
EXPORT_SYMBOL_GPL(netdev_switch_fib_ipv4_del);

/**
 *	netdev_switch_fib_ipv4_abort - Abort an IPv4 FIB operation
 *
 *	@fi: route FIB info structure
 */
void netdev_switch_fib_ipv4_abort(struct fib_info *fi)
{
	/* There was a problem installing this route to the offload
	 * device.  For now, until we come up with more refined
	 * policy handling, abruptly end IPv4 fib offloading for
	 * for entire net by flushing offload device(s) of all
	 * IPv4 routes, and mark IPv4 fib offloading broken from
	 * this point forward.
	 */

	fib_flush_external(fi->fib_net);
	fi->fib_net->ipv4.fib_offload_disabled = true;
}
EXPORT_SYMBOL_GPL(netdev_switch_fib_ipv4_abort);