summaryrefslogtreecommitdiff
path: root/drivers/net/netdevsim/dev.c
blob: 2fa1b20613701eaa4b5baa4d85e86d24b57f7a56 (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
/*
 * Copyright (c) 2018 Cumulus Networks. All rights reserved.
 * Copyright (c) 2018 David Ahern <dsa@cumulusnetworks.com>
 * Copyright (c) 2019 Mellanox Technologies. All rights reserved.
 *
 * This software is licensed under the GNU General License Version 2,
 * June 1991 as shown in the file COPYING in the top-level directory of this
 * source tree.
 *
 * THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS"
 * WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE
 * OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME
 * THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
 */

#include <linux/debugfs.h>
#include <linux/device.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/random.h>
#include <linux/rtnetlink.h>
#include <net/devlink.h>

#include "netdevsim.h"

static struct dentry *nsim_dev_ddir;

static int nsim_dev_debugfs_init(struct nsim_dev *nsim_dev)
{
	char dev_ddir_name[16];

	sprintf(dev_ddir_name, DRV_NAME "%u", nsim_dev->nsim_bus_dev->dev.id);
	nsim_dev->ddir = debugfs_create_dir(dev_ddir_name, nsim_dev_ddir);
	if (IS_ERR_OR_NULL(nsim_dev->ddir))
		return PTR_ERR_OR_ZERO(nsim_dev->ddir) ?: -EINVAL;
	nsim_dev->ports_ddir = debugfs_create_dir("ports", nsim_dev->ddir);
	if (IS_ERR_OR_NULL(nsim_dev->ports_ddir))
		return PTR_ERR_OR_ZERO(nsim_dev->ports_ddir) ?: -EINVAL;
	return 0;
}

static void nsim_dev_debugfs_exit(struct nsim_dev *nsim_dev)
{
	debugfs_remove_recursive(nsim_dev->ports_ddir);
	debugfs_remove_recursive(nsim_dev->ddir);
}

static int nsim_dev_port_debugfs_init(struct nsim_dev *nsim_dev,
				      struct nsim_dev_port *nsim_dev_port)
{
	char port_ddir_name[16];
	char dev_link_name[32];

	sprintf(port_ddir_name, "%u", nsim_dev_port->port_index);
	nsim_dev_port->ddir = debugfs_create_dir(port_ddir_name,
						 nsim_dev->ports_ddir);
	if (IS_ERR_OR_NULL(nsim_dev_port->ddir))
		return -ENOMEM;

	sprintf(dev_link_name, "../../../" DRV_NAME "%u",
		nsim_dev->nsim_bus_dev->dev.id);
	debugfs_create_symlink("dev", nsim_dev_port->ddir, dev_link_name);

	return 0;
}

static void nsim_dev_port_debugfs_exit(struct nsim_dev_port *nsim_dev_port)
{
	debugfs_remove_recursive(nsim_dev_port->ddir);
}

static u64 nsim_dev_ipv4_fib_resource_occ_get(void *priv)
{
	struct nsim_dev *nsim_dev = priv;

	return nsim_fib_get_val(nsim_dev->fib_data,
				NSIM_RESOURCE_IPV4_FIB, false);
}

static u64 nsim_dev_ipv4_fib_rules_res_occ_get(void *priv)
{
	struct nsim_dev *nsim_dev = priv;

	return nsim_fib_get_val(nsim_dev->fib_data,
				NSIM_RESOURCE_IPV4_FIB_RULES, false);
}

static u64 nsim_dev_ipv6_fib_resource_occ_get(void *priv)
{
	struct nsim_dev *nsim_dev = priv;

	return nsim_fib_get_val(nsim_dev->fib_data,
				NSIM_RESOURCE_IPV6_FIB, false);
}

static u64 nsim_dev_ipv6_fib_rules_res_occ_get(void *priv)
{
	struct nsim_dev *nsim_dev = priv;

	return nsim_fib_get_val(nsim_dev->fib_data,
				NSIM_RESOURCE_IPV6_FIB_RULES, false);
}

static int nsim_dev_resources_register(struct devlink *devlink)
{
	struct nsim_dev *nsim_dev = devlink_priv(devlink);
	struct devlink_resource_size_params params = {
		.size_max = (u64)-1,
		.size_granularity = 1,
		.unit = DEVLINK_RESOURCE_UNIT_ENTRY
	};
	int err;
	u64 n;

	/* Resources for IPv4 */
	err = devlink_resource_register(devlink, "IPv4", (u64)-1,
					NSIM_RESOURCE_IPV4,
					DEVLINK_RESOURCE_ID_PARENT_TOP,
					&params);
	if (err) {
		pr_err("Failed to register IPv4 top resource\n");
		goto out;
	}

	n = nsim_fib_get_val(nsim_dev->fib_data,
			     NSIM_RESOURCE_IPV4_FIB, true);
	err = devlink_resource_register(devlink, "fib", n,
					NSIM_RESOURCE_IPV4_FIB,
					NSIM_RESOURCE_IPV4, &params);
	if (err) {
		pr_err("Failed to register IPv4 FIB resource\n");
		return err;
	}

	n = nsim_fib_get_val(nsim_dev->fib_data,
			     NSIM_RESOURCE_IPV4_FIB_RULES, true);
	err = devlink_resource_register(devlink, "fib-rules", n,
					NSIM_RESOURCE_IPV4_FIB_RULES,
					NSIM_RESOURCE_IPV4, &params);
	if (err) {
		pr_err("Failed to register IPv4 FIB rules resource\n");
		return err;
	}

	/* Resources for IPv6 */
	err = devlink_resource_register(devlink, "IPv6", (u64)-1,
					NSIM_RESOURCE_IPV6,
					DEVLINK_RESOURCE_ID_PARENT_TOP,
					&params);
	if (err) {
		pr_err("Failed to register IPv6 top resource\n");
		goto out;
	}

	n = nsim_fib_get_val(nsim_dev->fib_data,
			     NSIM_RESOURCE_IPV6_FIB, true);
	err = devlink_resource_register(devlink, "fib", n,
					NSIM_RESOURCE_IPV6_FIB,
					NSIM_RESOURCE_IPV6, &params);
	if (err) {
		pr_err("Failed to register IPv6 FIB resource\n");
		return err;
	}

	n = nsim_fib_get_val(nsim_dev->fib_data,
			     NSIM_RESOURCE_IPV6_FIB_RULES, true);
	err = devlink_resource_register(devlink, "fib-rules", n,
					NSIM_RESOURCE_IPV6_FIB_RULES,
					NSIM_RESOURCE_IPV6, &params);
	if (err) {
		pr_err("Failed to register IPv6 FIB rules resource\n");
		return err;
	}

	devlink_resource_occ_get_register(devlink,
					  NSIM_RESOURCE_IPV4_FIB,
					  nsim_dev_ipv4_fib_resource_occ_get,
					  nsim_dev);
	devlink_resource_occ_get_register(devlink,
					  NSIM_RESOURCE_IPV4_FIB_RULES,
					  nsim_dev_ipv4_fib_rules_res_occ_get,
					  nsim_dev);
	devlink_resource_occ_get_register(devlink,
					  NSIM_RESOURCE_IPV6_FIB,
					  nsim_dev_ipv6_fib_resource_occ_get,
					  nsim_dev);
	devlink_resource_occ_get_register(devlink,
					  NSIM_RESOURCE_IPV6_FIB_RULES,
					  nsim_dev_ipv6_fib_rules_res_occ_get,
					  nsim_dev);
out:
	return err;
}

static int nsim_dev_reload(struct devlink *devlink,
			   struct netlink_ext_ack *extack)
{
	struct nsim_dev *nsim_dev = devlink_priv(devlink);
	enum nsim_resource_id res_ids[] = {
		NSIM_RESOURCE_IPV4_FIB, NSIM_RESOURCE_IPV4_FIB_RULES,
		NSIM_RESOURCE_IPV6_FIB, NSIM_RESOURCE_IPV6_FIB_RULES
	};
	int i;

	for (i = 0; i < ARRAY_SIZE(res_ids); ++i) {
		int err;
		u64 val;

		err = devlink_resource_size_get(devlink, res_ids[i], &val);
		if (!err) {
			err = nsim_fib_set_max(nsim_dev->fib_data,
					       res_ids[i], val, extack);
			if (err)
				return err;
		}
	}

	return 0;
}

static const struct devlink_ops nsim_dev_devlink_ops = {
	.reload = nsim_dev_reload,
};

static struct nsim_dev *
nsim_dev_create(struct nsim_bus_dev *nsim_bus_dev, unsigned int port_count)
{
	struct nsim_dev *nsim_dev;
	struct devlink *devlink;
	int err;

	devlink = devlink_alloc(&nsim_dev_devlink_ops, sizeof(*nsim_dev));
	if (!devlink)
		return ERR_PTR(-ENOMEM);
	nsim_dev = devlink_priv(devlink);
	nsim_dev->nsim_bus_dev = nsim_bus_dev;
	nsim_dev->switch_id.id_len = sizeof(nsim_dev->switch_id.id);
	get_random_bytes(nsim_dev->switch_id.id, nsim_dev->switch_id.id_len);
	INIT_LIST_HEAD(&nsim_dev->port_list);
	mutex_init(&nsim_dev->port_list_lock);

	nsim_dev->fib_data = nsim_fib_create();
	if (IS_ERR(nsim_dev->fib_data)) {
		err = PTR_ERR(nsim_dev->fib_data);
		goto err_devlink_free;
	}

	err = nsim_dev_resources_register(devlink);
	if (err)
		goto err_fib_destroy;

	err = devlink_register(devlink, &nsim_bus_dev->dev);
	if (err)
		goto err_resources_unregister;

	err = nsim_dev_debugfs_init(nsim_dev);
	if (err)
		goto err_dl_unregister;

	err = nsim_bpf_dev_init(nsim_dev);
	if (err)
		goto err_debugfs_exit;

	return nsim_dev;

err_debugfs_exit:
	nsim_dev_debugfs_exit(nsim_dev);
err_dl_unregister:
	devlink_unregister(devlink);
err_resources_unregister:
	devlink_resources_unregister(devlink, NULL);
err_fib_destroy:
	nsim_fib_destroy(nsim_dev->fib_data);
err_devlink_free:
	devlink_free(devlink);
	return ERR_PTR(err);
}

void nsim_dev_destroy(struct nsim_dev *nsim_dev)
{
	struct devlink *devlink = priv_to_devlink(nsim_dev);

	nsim_bpf_dev_exit(nsim_dev);
	nsim_dev_debugfs_exit(nsim_dev);
	devlink_unregister(devlink);
	devlink_resources_unregister(devlink, NULL);
	nsim_fib_destroy(nsim_dev->fib_data);
	mutex_destroy(&nsim_dev->port_list_lock);
	devlink_free(devlink);
}

static int __nsim_dev_port_add(struct nsim_dev *nsim_dev,
			       unsigned int port_index)
{
	struct nsim_dev_port *nsim_dev_port;
	struct devlink_port *devlink_port;
	int err;

	nsim_dev_port = kzalloc(sizeof(*nsim_dev_port), GFP_KERNEL);
	if (!nsim_dev_port)
		return -ENOMEM;
	nsim_dev_port->port_index = port_index;

	devlink_port = &nsim_dev_port->devlink_port;
	devlink_port_attrs_set(devlink_port, DEVLINK_PORT_FLAVOUR_PHYSICAL,
			       port_index + 1, 0, 0,
			       nsim_dev->switch_id.id,
			       nsim_dev->switch_id.id_len);
	err = devlink_port_register(priv_to_devlink(nsim_dev), devlink_port,
				    port_index);
	if (err)
		goto err_port_free;

	err = nsim_dev_port_debugfs_init(nsim_dev, nsim_dev_port);
	if (err)
		goto err_dl_port_unregister;

	list_add(&nsim_dev_port->list, &nsim_dev->port_list);

	return 0;

err_dl_port_unregister:
	devlink_port_unregister(devlink_port);
err_port_free:
	kfree(nsim_dev_port);
	return err;
}

static void __nsim_dev_port_del(struct nsim_dev_port *nsim_dev_port)
{
	struct devlink_port *devlink_port = &nsim_dev_port->devlink_port;

	list_del(&nsim_dev_port->list);
	nsim_dev_port_debugfs_exit(nsim_dev_port);
	devlink_port_unregister(devlink_port);
	kfree(nsim_dev_port);
}

static void nsim_dev_port_del_all(struct nsim_dev *nsim_dev)
{
	struct nsim_dev_port *nsim_dev_port, *tmp;

	list_for_each_entry_safe(nsim_dev_port, tmp,
				 &nsim_dev->port_list, list)
		__nsim_dev_port_del(nsim_dev_port);
}

int nsim_dev_probe(struct nsim_bus_dev *nsim_bus_dev)
{
	struct nsim_dev *nsim_dev;
	int i;
	int err;

	nsim_dev = nsim_dev_create(nsim_bus_dev, nsim_bus_dev->port_count);
	if (IS_ERR(nsim_dev))
		return PTR_ERR(nsim_dev);
	dev_set_drvdata(&nsim_bus_dev->dev, nsim_dev);

	for (i = 0; i < nsim_bus_dev->port_count; i++) {
		err = __nsim_dev_port_add(nsim_dev, i);
		if (err)
			goto err_port_del_all;
	}
	return 0;

err_port_del_all:
	nsim_dev_port_del_all(nsim_dev);
	nsim_dev_destroy(nsim_dev);
	return err;
}

void nsim_dev_remove(struct nsim_bus_dev *nsim_bus_dev)
{
	struct nsim_dev *nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev);

	nsim_dev_port_del_all(nsim_dev);
	nsim_dev_destroy(nsim_dev);
}

static struct nsim_dev_port *
__nsim_dev_port_lookup(struct nsim_dev *nsim_dev, unsigned int port_index)
{
	struct nsim_dev_port *nsim_dev_port;

	list_for_each_entry(nsim_dev_port, &nsim_dev->port_list, list)
		if (nsim_dev_port->port_index == port_index)
			return nsim_dev_port;
	return NULL;
}

int nsim_dev_port_add(struct nsim_bus_dev *nsim_bus_dev,
		      unsigned int port_index)
{
	struct nsim_dev *nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev);
	int err;

	mutex_lock(&nsim_dev->port_list_lock);
	if (__nsim_dev_port_lookup(nsim_dev, port_index))
		err = -EEXIST;
	else
		err = __nsim_dev_port_add(nsim_dev, port_index);
	mutex_unlock(&nsim_dev->port_list_lock);
	return err;
}

int nsim_dev_port_del(struct nsim_bus_dev *nsim_bus_dev,
		      unsigned int port_index)
{
	struct nsim_dev *nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev);
	struct nsim_dev_port *nsim_dev_port;
	int err = 0;

	mutex_lock(&nsim_dev->port_list_lock);
	nsim_dev_port = __nsim_dev_port_lookup(nsim_dev, port_index);
	if (!nsim_dev_port)
		err = -ENOENT;
	else
		__nsim_dev_port_del(nsim_dev_port);
	mutex_unlock(&nsim_dev->port_list_lock);
	return err;
}

int nsim_dev_init(void)
{
	nsim_dev_ddir = debugfs_create_dir(DRV_NAME, NULL);
	if (IS_ERR_OR_NULL(nsim_dev_ddir))
		return -ENOMEM;
	return 0;
}

void nsim_dev_exit(void)
{
	debugfs_remove_recursive(nsim_dev_ddir);
}