summaryrefslogtreecommitdiff
path: root/net/dsa/dsa.c
blob: ea5169e671aeae4796d99fa40f482460c9fd3eea (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
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * net/dsa/dsa.c - Hardware switch handling
 * Copyright (c) 2008-2009 Marvell Semiconductor
 * Copyright (c) 2013 Florian Fainelli <florian@openwrt.org>
 */

#include <linux/device.h>
#include <linux/list.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/notifier.h>
#include <linux/of.h>
#include <linux/of_mdio.h>
#include <linux/of_platform.h>
#include <linux/of_net.h>
#include <linux/netdevice.h>
#include <linux/sysfs.h>
#include <linux/phy_fixed.h>
#include <linux/ptp_classify.h>
#include <linux/etherdevice.h>

#include "dsa_priv.h"

static LIST_HEAD(dsa_tag_drivers_list);
static DEFINE_MUTEX(dsa_tag_drivers_lock);

static struct sk_buff *dsa_slave_notag_xmit(struct sk_buff *skb,
					    struct net_device *dev)
{
	/* Just return the original SKB */
	return skb;
}

static const struct dsa_device_ops none_ops = {
	.name	= "none",
	.proto	= DSA_TAG_PROTO_NONE,
	.xmit	= dsa_slave_notag_xmit,
	.rcv	= NULL,
};

DSA_TAG_DRIVER(none_ops);

static void dsa_tag_driver_register(struct dsa_tag_driver *dsa_tag_driver,
				    struct module *owner)
{
	dsa_tag_driver->owner = owner;

	mutex_lock(&dsa_tag_drivers_lock);
	list_add_tail(&dsa_tag_driver->list, &dsa_tag_drivers_list);
	mutex_unlock(&dsa_tag_drivers_lock);
}

void dsa_tag_drivers_register(struct dsa_tag_driver *dsa_tag_driver_array[],
			      unsigned int count, struct module *owner)
{
	unsigned int i;

	for (i = 0; i < count; i++)
		dsa_tag_driver_register(dsa_tag_driver_array[i], owner);
}

static void dsa_tag_driver_unregister(struct dsa_tag_driver *dsa_tag_driver)
{
	mutex_lock(&dsa_tag_drivers_lock);
	list_del(&dsa_tag_driver->list);
	mutex_unlock(&dsa_tag_drivers_lock);
}
EXPORT_SYMBOL_GPL(dsa_tag_drivers_register);

void dsa_tag_drivers_unregister(struct dsa_tag_driver *dsa_tag_driver_array[],
				unsigned int count)
{
	unsigned int i;

	for (i = 0; i < count; i++)
		dsa_tag_driver_unregister(dsa_tag_driver_array[i]);
}
EXPORT_SYMBOL_GPL(dsa_tag_drivers_unregister);

const char *dsa_tag_protocol_to_str(const struct dsa_device_ops *ops)
{
	return ops->name;
};

/* Function takes a reference on the module owning the tagger,
 * so dsa_tag_driver_put must be called afterwards.
 */
const struct dsa_device_ops *dsa_find_tagger_by_name(const char *buf)
{
	const struct dsa_device_ops *ops = ERR_PTR(-ENOPROTOOPT);
	struct dsa_tag_driver *dsa_tag_driver;

	mutex_lock(&dsa_tag_drivers_lock);
	list_for_each_entry(dsa_tag_driver, &dsa_tag_drivers_list, list) {
		const struct dsa_device_ops *tmp = dsa_tag_driver->ops;

		if (!sysfs_streq(buf, tmp->name))
			continue;

		if (!try_module_get(dsa_tag_driver->owner))
			break;

		ops = tmp;
		break;
	}
	mutex_unlock(&dsa_tag_drivers_lock);

	return ops;
}

const struct dsa_device_ops *dsa_tag_driver_get(int tag_protocol)
{
	struct dsa_tag_driver *dsa_tag_driver;
	const struct dsa_device_ops *ops;
	bool found = false;

	request_module("%s%d", DSA_TAG_DRIVER_ALIAS, tag_protocol);

	mutex_lock(&dsa_tag_drivers_lock);
	list_for_each_entry(dsa_tag_driver, &dsa_tag_drivers_list, list) {
		ops = dsa_tag_driver->ops;
		if (ops->proto == tag_protocol) {
			found = true;
			break;
		}
	}

	if (found) {
		if (!try_module_get(dsa_tag_driver->owner))
			ops = ERR_PTR(-ENOPROTOOPT);
	} else {
		ops = ERR_PTR(-ENOPROTOOPT);
	}

	mutex_unlock(&dsa_tag_drivers_lock);

	return ops;
}

void dsa_tag_driver_put(const struct dsa_device_ops *ops)
{
	struct dsa_tag_driver *dsa_tag_driver;

	mutex_lock(&dsa_tag_drivers_lock);
	list_for_each_entry(dsa_tag_driver, &dsa_tag_drivers_list, list) {
		if (dsa_tag_driver->ops == ops) {
			module_put(dsa_tag_driver->owner);
			break;
		}
	}
	mutex_unlock(&dsa_tag_drivers_lock);
}

static int dev_is_class(struct device *dev, void *class)
{
	if (dev->class != NULL && !strcmp(dev->class->name, class))
		return 1;

	return 0;
}

static struct device *dev_find_class(struct device *parent, char *class)
{
	if (dev_is_class(parent, class)) {
		get_device(parent);
		return parent;
	}

	return device_find_child(parent, class, dev_is_class);
}

struct net_device *dsa_dev_to_net_device(struct device *dev)
{
	struct device *d;

	d = dev_find_class(dev, "net");
	if (d != NULL) {
		struct net_device *nd;

		nd = to_net_dev(d);
		dev_hold(nd);
		put_device(d);

		return nd;
	}

	return NULL;
}
EXPORT_SYMBOL_GPL(dsa_dev_to_net_device);

/* Determine if we should defer delivery of skb until we have a rx timestamp.
 *
 * Called from dsa_switch_rcv. For now, this will only work if tagging is
 * enabled on the switch. Normally the MAC driver would retrieve the hardware
 * timestamp when it reads the packet out of the hardware. However in a DSA
 * switch, the DSA driver owning the interface to which the packet is
 * delivered is never notified unless we do so here.
 */
static bool dsa_skb_defer_rx_timestamp(struct dsa_slave_priv *p,
				       struct sk_buff *skb)
{
	struct dsa_switch *ds = p->dp->ds;
	unsigned int type;

	if (skb_headroom(skb) < ETH_HLEN)
		return false;

	__skb_push(skb, ETH_HLEN);

	type = ptp_classify_raw(skb);

	__skb_pull(skb, ETH_HLEN);

	if (type == PTP_CLASS_NONE)
		return false;

	if (likely(ds->ops->port_rxtstamp))
		return ds->ops->port_rxtstamp(ds, p->dp->index, skb, type);

	return false;
}

static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
			  struct packet_type *pt, struct net_device *unused)
{
	struct dsa_port *cpu_dp = dev->dsa_ptr;
	struct sk_buff *nskb = NULL;
	struct dsa_slave_priv *p;

	if (unlikely(!cpu_dp)) {
		kfree_skb(skb);
		return 0;
	}

	skb = skb_unshare(skb, GFP_ATOMIC);
	if (!skb)
		return 0;

	nskb = cpu_dp->rcv(skb, dev);
	if (!nskb) {
		kfree_skb(skb);
		return 0;
	}

	skb = nskb;
	skb_push(skb, ETH_HLEN);
	skb->pkt_type = PACKET_HOST;
	skb->protocol = eth_type_trans(skb, skb->dev);

	if (unlikely(!dsa_slave_dev_check(skb->dev))) {
		/* Packet is to be injected directly on an upper
		 * device, e.g. a team/bond, so skip all DSA-port
		 * specific actions.
		 */
		netif_rx(skb);
		return 0;
	}

	p = netdev_priv(skb->dev);

	if (unlikely(cpu_dp->ds->untag_bridge_pvid)) {
		nskb = dsa_untag_bridge_pvid(skb);
		if (!nskb) {
			kfree_skb(skb);
			return 0;
		}
		skb = nskb;
	}

	dev_sw_netstats_rx_add(skb->dev, skb->len);

	if (dsa_skb_defer_rx_timestamp(p, skb))
		return 0;

	gro_cells_receive(&p->gcells, skb);

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static bool dsa_port_is_initialized(const struct dsa_port *dp)
{
	return dp->type == DSA_PORT_TYPE_USER && dp->slave;
}

int dsa_switch_suspend(struct dsa_switch *ds)
{
	struct dsa_port *dp;
	int ret = 0;

	/* Suspend slave network devices */
	dsa_switch_for_each_port(dp, ds) {
		if (!dsa_port_is_initialized(dp))
			continue;

		ret = dsa_slave_suspend(dp->slave);
		if (ret)
			return ret;
	}

	if (ds->ops->suspend)
		ret = ds->ops->suspend(ds);

	return ret;
}
EXPORT_SYMBOL_GPL(dsa_switch_suspend);

int dsa_switch_resume(struct dsa_switch *ds)
{
	struct dsa_port *dp;
	int ret = 0;

	if (ds->ops->resume)
		ret = ds->ops->resume(ds);

	if (ret)
		return ret;

	/* Resume slave network devices */
	dsa_switch_for_each_port(dp, ds) {
		if (!dsa_port_is_initialized(dp))
			continue;

		ret = dsa_slave_resume(dp->slave);
		if (ret)
			return ret;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(dsa_switch_resume);
#endif

static struct packet_type dsa_pack_type __read_mostly = {
	.type	= cpu_to_be16(ETH_P_XDSA),
	.func	= dsa_switch_rcv,
};

static struct workqueue_struct *dsa_owq;

bool dsa_schedule_work(struct work_struct *work)
{
	return queue_work(dsa_owq, work);
}

void dsa_flush_workqueue(void)
{
	flush_workqueue(dsa_owq);
}

int dsa_devlink_param_get(struct devlink *dl, u32 id,
			  struct devlink_param_gset_ctx *ctx)
{
	struct dsa_switch *ds = dsa_devlink_to_ds(dl);

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

	return ds->ops->devlink_param_get(ds, id, ctx);
}
EXPORT_SYMBOL_GPL(dsa_devlink_param_get);

int dsa_devlink_param_set(struct devlink *dl, u32 id,
			  struct devlink_param_gset_ctx *ctx)
{
	struct dsa_switch *ds = dsa_devlink_to_ds(dl);

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

	return ds->ops->devlink_param_set(ds, id, ctx);
}
EXPORT_SYMBOL_GPL(dsa_devlink_param_set);

int dsa_devlink_params_register(struct dsa_switch *ds,
				const struct devlink_param *params,
				size_t params_count)
{
	return devlink_params_register(ds->devlink, params, params_count);
}
EXPORT_SYMBOL_GPL(dsa_devlink_params_register);

void dsa_devlink_params_unregister(struct dsa_switch *ds,
				   const struct devlink_param *params,
				   size_t params_count)
{
	devlink_params_unregister(ds->devlink, params, params_count);
}
EXPORT_SYMBOL_GPL(dsa_devlink_params_unregister);

int dsa_devlink_resource_register(struct dsa_switch *ds,
				  const char *resource_name,
				  u64 resource_size,
				  u64 resource_id,
				  u64 parent_resource_id,
				  const struct devlink_resource_size_params *size_params)
{
	return devlink_resource_register(ds->devlink, resource_name,
					 resource_size, resource_id,
					 parent_resource_id,
					 size_params);
}
EXPORT_SYMBOL_GPL(dsa_devlink_resource_register);

void dsa_devlink_resources_unregister(struct dsa_switch *ds)
{
	devlink_resources_unregister(ds->devlink, NULL);
}
EXPORT_SYMBOL_GPL(dsa_devlink_resources_unregister);

void dsa_devlink_resource_occ_get_register(struct dsa_switch *ds,
					   u64 resource_id,
					   devlink_resource_occ_get_t *occ_get,
					   void *occ_get_priv)
{
	return devlink_resource_occ_get_register(ds->devlink, resource_id,
						 occ_get, occ_get_priv);
}
EXPORT_SYMBOL_GPL(dsa_devlink_resource_occ_get_register);

void dsa_devlink_resource_occ_get_unregister(struct dsa_switch *ds,
					     u64 resource_id)
{
	devlink_resource_occ_get_unregister(ds->devlink, resource_id);
}
EXPORT_SYMBOL_GPL(dsa_devlink_resource_occ_get_unregister);

struct devlink_region *
dsa_devlink_region_create(struct dsa_switch *ds,
			  const struct devlink_region_ops *ops,
			  u32 region_max_snapshots, u64 region_size)
{
	return devlink_region_create(ds->devlink, ops, region_max_snapshots,
				     region_size);
}
EXPORT_SYMBOL_GPL(dsa_devlink_region_create);

struct devlink_region *
dsa_devlink_port_region_create(struct dsa_switch *ds,
			       int port,
			       const struct devlink_port_region_ops *ops,
			       u32 region_max_snapshots, u64 region_size)
{
	struct dsa_port *dp = dsa_to_port(ds, port);

	return devlink_port_region_create(&dp->devlink_port, ops,
					  region_max_snapshots,
					  region_size);
}
EXPORT_SYMBOL_GPL(dsa_devlink_port_region_create);

void dsa_devlink_region_destroy(struct devlink_region *region)
{
	devlink_region_destroy(region);
}
EXPORT_SYMBOL_GPL(dsa_devlink_region_destroy);

struct dsa_port *dsa_port_from_netdev(struct net_device *netdev)
{
	if (!netdev || !dsa_slave_dev_check(netdev))
		return ERR_PTR(-ENODEV);

	return dsa_slave_to_port(netdev);
}
EXPORT_SYMBOL_GPL(dsa_port_from_netdev);

static int __init dsa_init_module(void)
{
	int rc;

	dsa_owq = alloc_ordered_workqueue("dsa_ordered",
					  WQ_MEM_RECLAIM);
	if (!dsa_owq)
		return -ENOMEM;

	rc = dsa_slave_register_notifier();
	if (rc)
		goto register_notifier_fail;

	dev_add_pack(&dsa_pack_type);

	dsa_tag_driver_register(&DSA_TAG_DRIVER_NAME(none_ops),
				THIS_MODULE);

	return 0;

register_notifier_fail:
	destroy_workqueue(dsa_owq);

	return rc;
}
module_init(dsa_init_module);

static void __exit dsa_cleanup_module(void)
{
	dsa_tag_driver_unregister(&DSA_TAG_DRIVER_NAME(none_ops));

	dsa_slave_unregister_notifier();
	dev_remove_pack(&dsa_pack_type);
	destroy_workqueue(dsa_owq);
}
module_exit(dsa_cleanup_module);

MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:dsa");