summaryrefslogtreecommitdiffstats
path: root/net/devlink/resource.c
blob: c8b615e4c385096212a567d57a6a2e46bc04ee5e (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
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (c) 2016 Mellanox Technologies. All rights reserved.
 * Copyright (c) 2016 Jiri Pirko <jiri@mellanox.com>
 */

#include "devl_internal.h"

/**
 * struct devlink_resource - devlink resource
 * @name: name of the resource
 * @id: id, per devlink instance
 * @size: size of the resource
 * @size_new: updated size of the resource, reload is needed
 * @size_valid: valid in case the total size of the resource is valid
 *              including its children
 * @parent: parent resource
 * @size_params: size parameters
 * @list: parent list
 * @resource_list: list of child resources
 * @occ_get: occupancy getter callback
 * @occ_get_priv: occupancy getter callback priv
 */
struct devlink_resource {
	const char *name;
	u64 id;
	u64 size;
	u64 size_new;
	bool size_valid;
	struct devlink_resource *parent;
	struct devlink_resource_size_params size_params;
	struct list_head list;
	struct list_head resource_list;
	devlink_resource_occ_get_t *occ_get;
	void *occ_get_priv;
};

static struct devlink_resource *
devlink_resource_find(struct devlink *devlink,
		      struct devlink_resource *resource, u64 resource_id)
{
	struct list_head *resource_list;

	if (resource)
		resource_list = &resource->resource_list;
	else
		resource_list = &devlink->resource_list;

	list_for_each_entry(resource, resource_list, list) {
		struct devlink_resource *child_resource;

		if (resource->id == resource_id)
			return resource;

		child_resource = devlink_resource_find(devlink, resource,
						       resource_id);
		if (child_resource)
			return child_resource;
	}
	return NULL;
}

static void
devlink_resource_validate_children(struct devlink_resource *resource)
{
	struct devlink_resource *child_resource;
	bool size_valid = true;
	u64 parts_size = 0;

	if (list_empty(&resource->resource_list))
		goto out;

	list_for_each_entry(child_resource, &resource->resource_list, list)
		parts_size += child_resource->size_new;

	if (parts_size > resource->size_new)
		size_valid = false;
out:
	resource->size_valid = size_valid;
}

static int
devlink_resource_validate_size(struct devlink_resource *resource, u64 size,
			       struct netlink_ext_ack *extack)
{
	u64 reminder;
	int err = 0;

	if (size > resource->size_params.size_max) {
		NL_SET_ERR_MSG(extack, "Size larger than maximum");
		err = -EINVAL;
	}

	if (size < resource->size_params.size_min) {
		NL_SET_ERR_MSG(extack, "Size smaller than minimum");
		err = -EINVAL;
	}

	div64_u64_rem(size, resource->size_params.size_granularity, &reminder);
	if (reminder) {
		NL_SET_ERR_MSG(extack, "Wrong granularity");
		err = -EINVAL;
	}

	return err;
}

int devlink_nl_cmd_resource_set(struct sk_buff *skb, struct genl_info *info)
{
	struct devlink *devlink = info->user_ptr[0];
	struct devlink_resource *resource;
	u64 resource_id;
	u64 size;
	int err;

	if (GENL_REQ_ATTR_CHECK(info, DEVLINK_ATTR_RESOURCE_ID) ||
	    GENL_REQ_ATTR_CHECK(info, DEVLINK_ATTR_RESOURCE_SIZE))
		return -EINVAL;
	resource_id = nla_get_u64(info->attrs[DEVLINK_ATTR_RESOURCE_ID]);

	resource = devlink_resource_find(devlink, NULL, resource_id);
	if (!resource)
		return -EINVAL;

	size = nla_get_u64(info->attrs[DEVLINK_ATTR_RESOURCE_SIZE]);
	err = devlink_resource_validate_size(resource, size, info->extack);
	if (err)
		return err;

	resource->size_new = size;
	devlink_resource_validate_children(resource);
	if (resource->parent)
		devlink_resource_validate_children(resource->parent);
	return 0;
}

static int
devlink_resource_size_params_put(struct devlink_resource *resource,
				 struct sk_buff *skb)
{
	struct devlink_resource_size_params *size_params;

	size_params = &resource->size_params;
	if (nla_put_u64_64bit(skb, DEVLINK_ATTR_RESOURCE_SIZE_GRAN,
			      size_params->size_granularity, DEVLINK_ATTR_PAD) ||
	    nla_put_u64_64bit(skb, DEVLINK_ATTR_RESOURCE_SIZE_MAX,
			      size_params->size_max, DEVLINK_ATTR_PAD) ||
	    nla_put_u64_64bit(skb, DEVLINK_ATTR_RESOURCE_SIZE_MIN,
			      size_params->size_min, DEVLINK_ATTR_PAD) ||
	    nla_put_u8(skb, DEVLINK_ATTR_RESOURCE_UNIT, size_params->unit))
		return -EMSGSIZE;
	return 0;
}

static int devlink_resource_occ_put(struct devlink_resource *resource,
				    struct sk_buff *skb)
{
	if (!resource->occ_get)
		return 0;
	return nla_put_u64_64bit(skb, DEVLINK_ATTR_RESOURCE_OCC,
				 resource->occ_get(resource->occ_get_priv),
				 DEVLINK_ATTR_PAD);
}

static int devlink_resource_put(struct devlink *devlink, struct sk_buff *skb,
				struct devlink_resource *resource)
{
	struct devlink_resource *child_resource;
	struct nlattr *child_resource_attr;
	struct nlattr *resource_attr;

	resource_attr = nla_nest_start_noflag(skb, DEVLINK_ATTR_RESOURCE);
	if (!resource_attr)
		return -EMSGSIZE;

	if (nla_put_string(skb, DEVLINK_ATTR_RESOURCE_NAME, resource->name) ||
	    nla_put_u64_64bit(skb, DEVLINK_ATTR_RESOURCE_SIZE, resource->size,
			      DEVLINK_ATTR_PAD) ||
	    nla_put_u64_64bit(skb, DEVLINK_ATTR_RESOURCE_ID, resource->id,
			      DEVLINK_ATTR_PAD))
		goto nla_put_failure;
	if (resource->size != resource->size_new &&
	    nla_put_u64_64bit(skb, DEVLINK_ATTR_RESOURCE_SIZE_NEW,
			      resource->size_new, DEVLINK_ATTR_PAD))
		goto nla_put_failure;
	if (devlink_resource_occ_put(resource, skb))
		goto nla_put_failure;
	if (devlink_resource_size_params_put(resource, skb))
		goto nla_put_failure;
	if (list_empty(&resource->resource_list))
		goto out;

	if (nla_put_u8(skb, DEVLINK_ATTR_RESOURCE_SIZE_VALID,
		       resource->size_valid))
		goto nla_put_failure;

	child_resource_attr = nla_nest_start_noflag(skb,
						    DEVLINK_ATTR_RESOURCE_LIST);
	if (!child_resource_attr)
		goto nla_put_failure;

	list_for_each_entry(child_resource, &resource->resource_list, list) {
		if (devlink_resource_put(devlink, skb, child_resource))
			goto resource_put_failure;
	}

	nla_nest_end(skb, child_resource_attr);
out:
	nla_nest_end(skb, resource_attr);
	return 0;

resource_put_failure:
	nla_nest_cancel(skb, child_resource_attr);
nla_put_failure:
	nla_nest_cancel(skb, resource_attr);
	return -EMSGSIZE;
}

static int devlink_resource_fill(struct genl_info *info,
				 enum devlink_command cmd, int flags)
{
	struct devlink *devlink = info->user_ptr[0];
	struct devlink_resource *resource;
	struct nlattr *resources_attr;
	struct sk_buff *skb = NULL;
	struct nlmsghdr *nlh;
	bool incomplete;
	void *hdr;
	int i;
	int err;

	resource = list_first_entry(&devlink->resource_list,
				    struct devlink_resource, list);
start_again:
	err = devlink_nl_msg_reply_and_new(&skb, info);
	if (err)
		return err;

	hdr = genlmsg_put(skb, info->snd_portid, info->snd_seq,
			  &devlink_nl_family, NLM_F_MULTI, cmd);
	if (!hdr) {
		nlmsg_free(skb);
		return -EMSGSIZE;
	}

	if (devlink_nl_put_handle(skb, devlink))
		goto nla_put_failure;

	resources_attr = nla_nest_start_noflag(skb,
					       DEVLINK_ATTR_RESOURCE_LIST);
	if (!resources_attr)
		goto nla_put_failure;

	incomplete = false;
	i = 0;
	list_for_each_entry_from(resource, &devlink->resource_list, list) {
		err = devlink_resource_put(devlink, skb, resource);
		if (err) {
			if (!i)
				goto err_resource_put;
			incomplete = true;
			break;
		}
		i++;
	}
	nla_nest_end(skb, resources_attr);
	genlmsg_end(skb, hdr);
	if (incomplete)
		goto start_again;
send_done:
	nlh = nlmsg_put(skb, info->snd_portid, info->snd_seq,
			NLMSG_DONE, 0, flags | NLM_F_MULTI);
	if (!nlh) {
		err = devlink_nl_msg_reply_and_new(&skb, info);
		if (err)
			return err;
		goto send_done;
	}
	return genlmsg_reply(skb, info);

nla_put_failure:
	err = -EMSGSIZE;
err_resource_put:
	nlmsg_free(skb);
	return err;
}

int devlink_nl_cmd_resource_dump(struct sk_buff *skb, struct genl_info *info)
{
	struct devlink *devlink = info->user_ptr[0];

	if (list_empty(&devlink->resource_list))
		return -EOPNOTSUPP;

	return devlink_resource_fill(info, DEVLINK_CMD_RESOURCE_DUMP, 0);
}

int devlink_resources_validate(struct devlink *devlink,
			       struct devlink_resource *resource,
			       struct genl_info *info)
{
	struct list_head *resource_list;
	int err = 0;

	if (resource)
		resource_list = &resource->resource_list;
	else
		resource_list = &devlink->resource_list;

	list_for_each_entry(resource, resource_list, list) {
		if (!resource->size_valid)
			return -EINVAL;
		err = devlink_resources_validate(devlink, resource, info);
		if (err)
			return err;
	}
	return err;
}

/**
 * devl_resource_register - devlink resource register
 *
 * @devlink: devlink
 * @resource_name: resource's name
 * @resource_size: resource's size
 * @resource_id: resource's id
 * @parent_resource_id: resource's parent id
 * @size_params: size parameters
 *
 * Generic resources should reuse the same names across drivers.
 * Please see the generic resources list at:
 * Documentation/networking/devlink/devlink-resource.rst
 */
int devl_resource_register(struct devlink *devlink,
			   const char *resource_name,
			   u64 resource_size,
			   u64 resource_id,
			   u64 parent_resource_id,
			   const struct devlink_resource_size_params *size_params)
{
	struct devlink_resource *resource;
	struct list_head *resource_list;
	bool top_hierarchy;

	lockdep_assert_held(&devlink->lock);

	top_hierarchy = parent_resource_id == DEVLINK_RESOURCE_ID_PARENT_TOP;

	resource = devlink_resource_find(devlink, NULL, resource_id);
	if (resource)
		return -EINVAL;

	resource = kzalloc(sizeof(*resource), GFP_KERNEL);
	if (!resource)
		return -ENOMEM;

	if (top_hierarchy) {
		resource_list = &devlink->resource_list;
	} else {
		struct devlink_resource *parent_resource;

		parent_resource = devlink_resource_find(devlink, NULL,
							parent_resource_id);
		if (parent_resource) {
			resource_list = &parent_resource->resource_list;
			resource->parent = parent_resource;
		} else {
			kfree(resource);
			return -EINVAL;
		}
	}

	resource->name = resource_name;
	resource->size = resource_size;
	resource->size_new = resource_size;
	resource->id = resource_id;
	resource->size_valid = true;
	memcpy(&resource->size_params, size_params,
	       sizeof(resource->size_params));
	INIT_LIST_HEAD(&resource->resource_list);
	list_add_tail(&resource->list, resource_list);

	return 0;
}
EXPORT_SYMBOL_GPL(devl_resource_register);

/**
 *	devlink_resource_register - devlink resource register
 *
 *	@devlink: devlink
 *	@resource_name: resource's name
 *	@resource_size: resource's size
 *	@resource_id: resource's id
 *	@parent_resource_id: resource's parent id
 *	@size_params: size parameters
 *
 *	Generic resources should reuse the same names across drivers.
 *	Please see the generic resources list at:
 *	Documentation/networking/devlink/devlink-resource.rst
 *
 *	Context: Takes and release devlink->lock <mutex>.
 */
int devlink_resource_register(struct devlink *devlink,
			      const char *resource_name,
			      u64 resource_size,
			      u64 resource_id,
			      u64 parent_resource_id,
			      const struct devlink_resource_size_params *size_params)
{
	int err;

	devl_lock(devlink);
	err = devl_resource_register(devlink, resource_name, resource_size,
				     resource_id, parent_resource_id, size_params);
	devl_unlock(devlink);
	return err;
}
EXPORT_SYMBOL_GPL(devlink_resource_register);

static void devlink_resource_unregister(struct devlink *devlink,
					struct devlink_resource *resource)
{
	struct devlink_resource *tmp, *child_resource;

	list_for_each_entry_safe(child_resource, tmp, &resource->resource_list,
				 list) {
		devlink_resource_unregister(devlink, child_resource);
		list_del(&child_resource->list);
		kfree(child_resource);
	}
}

/**
 * devl_resources_unregister - free all resources
 *
 * @devlink: devlink
 */
void devl_resources_unregister(struct devlink *devlink)
{
	struct devlink_resource *tmp, *child_resource;

	lockdep_assert_held(&devlink->lock);

	list_for_each_entry_safe(child_resource, tmp, &devlink->resource_list,
				 list) {
		devlink_resource_unregister(devlink, child_resource);
		list_del(&child_resource->list);
		kfree(child_resource);
	}
}
EXPORT_SYMBOL_GPL(devl_resources_unregister);

/**
 *	devlink_resources_unregister - free all resources
 *
 *	@devlink: devlink
 *
 *	Context: Takes and release devlink->lock <mutex>.
 */
void devlink_resources_unregister(struct devlink *devlink)
{
	devl_lock(devlink);
	devl_resources_unregister(devlink);
	devl_unlock(devlink);
}
EXPORT_SYMBOL_GPL(devlink_resources_unregister);

/**
 * devl_resource_size_get - get and update size
 *
 * @devlink: devlink
 * @resource_id: the requested resource id
 * @p_resource_size: ptr to update
 */
int devl_resource_size_get(struct devlink *devlink,
			   u64 resource_id,
			   u64 *p_resource_size)
{
	struct devlink_resource *resource;

	lockdep_assert_held(&devlink->lock);

	resource = devlink_resource_find(devlink, NULL, resource_id);
	if (!resource)
		return -EINVAL;
	*p_resource_size = resource->size_new;
	resource->size = resource->size_new;
	return 0;
}
EXPORT_SYMBOL_GPL(devl_resource_size_get);

/**
 * devl_resource_occ_get_register - register occupancy getter
 *
 * @devlink: devlink
 * @resource_id: resource id
 * @occ_get: occupancy getter callback
 * @occ_get_priv: occupancy getter callback priv
 */
void devl_resource_occ_get_register(struct devlink *devlink,
				    u64 resource_id,
				    devlink_resource_occ_get_t *occ_get,
				    void *occ_get_priv)
{
	struct devlink_resource *resource;

	lockdep_assert_held(&devlink->lock);

	resource = devlink_resource_find(devlink, NULL, resource_id);
	if (WARN_ON(!resource))
		return;
	WARN_ON(resource->occ_get);

	resource->occ_get = occ_get;
	resource->occ_get_priv = occ_get_priv;
}
EXPORT_SYMBOL_GPL(devl_resource_occ_get_register);

/**
 *	devlink_resource_occ_get_register - register occupancy getter
 *
 *	@devlink: devlink
 *	@resource_id: resource id
 *	@occ_get: occupancy getter callback
 *	@occ_get_priv: occupancy getter callback priv
 *
 *	Context: Takes and release devlink->lock <mutex>.
 */
void devlink_resource_occ_get_register(struct devlink *devlink,
				       u64 resource_id,
				       devlink_resource_occ_get_t *occ_get,
				       void *occ_get_priv)
{
	devl_lock(devlink);
	devl_resource_occ_get_register(devlink, resource_id,
				       occ_get, occ_get_priv);
	devl_unlock(devlink);
}
EXPORT_SYMBOL_GPL(devlink_resource_occ_get_register);

/**
 * devl_resource_occ_get_unregister - unregister occupancy getter
 *
 * @devlink: devlink
 * @resource_id: resource id
 */
void devl_resource_occ_get_unregister(struct devlink *devlink,
				      u64 resource_id)
{
	struct devlink_resource *resource;

	lockdep_assert_held(&devlink->lock);

	resource = devlink_resource_find(devlink, NULL, resource_id);
	if (WARN_ON(!resource))
		return;
	WARN_ON(!resource->occ_get);

	resource->occ_get = NULL;
	resource->occ_get_priv = NULL;
}
EXPORT_SYMBOL_GPL(devl_resource_occ_get_unregister);

/**
 *	devlink_resource_occ_get_unregister - unregister occupancy getter
 *
 *	@devlink: devlink
 *	@resource_id: resource id
 *
 *	Context: Takes and release devlink->lock <mutex>.
 */
void devlink_resource_occ_get_unregister(struct devlink *devlink,
					 u64 resource_id)
{
	devl_lock(devlink);
	devl_resource_occ_get_unregister(devlink, resource_id);
	devl_unlock(devlink);
}
EXPORT_SYMBOL_GPL(devlink_resource_occ_get_unregister);