aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/infiniband/core/counters.c
blob: 955d061af06a8a58cd77291b619dc3feac20303a (plain) (blame)
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
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
/*
 * Copyright (c) 2019 Mellanox Technologies. All rights reserved.
 */
#include <rdma/ib_verbs.h>
#include <rdma/rdma_counter.h>

#include "core_priv.h"
#include "restrack.h"

#define ALL_AUTO_MODE_MASKS (RDMA_COUNTER_MASK_QP_TYPE)

static int __counter_set_mode(struct rdma_counter_mode *curr,
			      enum rdma_nl_counter_mode new_mode,
			      enum rdma_nl_counter_mask new_mask)
{
	if ((new_mode == RDMA_COUNTER_MODE_AUTO) &&
	    ((new_mask & (~ALL_AUTO_MODE_MASKS)) ||
	     (curr->mode != RDMA_COUNTER_MODE_NONE)))
		return -EINVAL;

	curr->mode = new_mode;
	curr->mask = new_mask;
	return 0;
}

/**
 * rdma_counter_set_auto_mode() - Turn on/off per-port auto mode
 *
 * When @on is true, the @mask must be set; When @on is false, it goes
 * into manual mode if there's any counter, so that the user is able to
 * manually access them.
 */
int rdma_counter_set_auto_mode(struct ib_device *dev, u8 port,
			       bool on, enum rdma_nl_counter_mask mask)
{
	struct rdma_port_counter *port_counter;
	int ret;

	port_counter = &dev->port_data[port].port_counter;
	if (!port_counter->hstats)
		return -EOPNOTSUPP;

	mutex_lock(&port_counter->lock);
	if (on) {
		ret = __counter_set_mode(&port_counter->mode,
					 RDMA_COUNTER_MODE_AUTO, mask);
	} else {
		if (port_counter->mode.mode != RDMA_COUNTER_MODE_AUTO) {
			ret = -EINVAL;
			goto out;
		}

		if (port_counter->num_counters)
			ret = __counter_set_mode(&port_counter->mode,
						 RDMA_COUNTER_MODE_MANUAL, 0);
		else
			ret = __counter_set_mode(&port_counter->mode,
						 RDMA_COUNTER_MODE_NONE, 0);
	}

out:
	mutex_unlock(&port_counter->lock);
	return ret;
}

static struct rdma_counter *rdma_counter_alloc(struct ib_device *dev, u8 port,
					       enum rdma_nl_counter_mode mode)
{
	struct rdma_port_counter *port_counter;
	struct rdma_counter *counter;
	int ret;

	if (!dev->ops.counter_dealloc || !dev->ops.counter_alloc_stats)
		return NULL;

	counter = kzalloc(sizeof(*counter), GFP_KERNEL);
	if (!counter)
		return NULL;

	counter->device    = dev;
	counter->port      = port;
	counter->res.type  = RDMA_RESTRACK_COUNTER;
	counter->stats     = dev->ops.counter_alloc_stats(counter);
	if (!counter->stats)
		goto err_stats;

	port_counter = &dev->port_data[port].port_counter;
	mutex_lock(&port_counter->lock);
	if (mode == RDMA_COUNTER_MODE_MANUAL) {
		ret = __counter_set_mode(&port_counter->mode,
					 RDMA_COUNTER_MODE_MANUAL, 0);
		if (ret)
			goto err_mode;
	}

	port_counter->num_counters++;
	mutex_unlock(&port_counter->lock);

	counter->mode.mode = mode;
	kref_init(&counter->kref);
	mutex_init(&counter->lock);

	return counter;

err_mode:
	mutex_unlock(&port_counter->lock);
	kfree(counter->stats);
err_stats:
	kfree(counter);
	return NULL;
}

static void rdma_counter_free(struct rdma_counter *counter)
{
	struct rdma_port_counter *port_counter;

	port_counter = &counter->device->port_data[counter->port].port_counter;
	mutex_lock(&port_counter->lock);
	port_counter->num_counters--;
	if (!port_counter->num_counters &&
	    (port_counter->mode.mode == RDMA_COUNTER_MODE_MANUAL))
		__counter_set_mode(&port_counter->mode, RDMA_COUNTER_MODE_NONE,
				   0);

	mutex_unlock(&port_counter->lock);

	rdma_restrack_del(&counter->res);
	kfree(counter->stats);
	kfree(counter);
}

static void auto_mode_init_counter(struct rdma_counter *counter,
				   const struct ib_qp *qp,
				   enum rdma_nl_counter_mask new_mask)
{
	struct auto_mode_param *param = &counter->mode.param;

	counter->mode.mode = RDMA_COUNTER_MODE_AUTO;
	counter->mode.mask = new_mask;

	if (new_mask & RDMA_COUNTER_MASK_QP_TYPE)
		param->qp_type = qp->qp_type;
}

static bool auto_mode_match(struct ib_qp *qp, struct rdma_counter *counter,
			    enum rdma_nl_counter_mask auto_mask)
{
	struct auto_mode_param *param = &counter->mode.param;
	bool match = true;

	if (rdma_is_kernel_res(&counter->res) != rdma_is_kernel_res(&qp->res))
		return false;

	/* Ensure that counter belong to right PID */
	if (!rdma_is_kernel_res(&counter->res) &&
	    !rdma_is_kernel_res(&qp->res) &&
	    (task_pid_vnr(counter->res.task) != current->pid))
		return false;

	if (auto_mask & RDMA_COUNTER_MASK_QP_TYPE)
		match &= (param->qp_type == qp->qp_type);

	return match;
}

static int __rdma_counter_bind_qp(struct rdma_counter *counter,
				  struct ib_qp *qp)
{
	int ret;

	if (qp->counter)
		return -EINVAL;

	if (!qp->device->ops.counter_bind_qp)
		return -EOPNOTSUPP;

	mutex_lock(&counter->lock);
	ret = qp->device->ops.counter_bind_qp(counter, qp);
	mutex_unlock(&counter->lock);

	return ret;
}

static int __rdma_counter_unbind_qp(struct ib_qp *qp)
{
	struct rdma_counter *counter = qp->counter;
	int ret;

	if (!qp->device->ops.counter_unbind_qp)
		return -EOPNOTSUPP;

	mutex_lock(&counter->lock);
	ret = qp->device->ops.counter_unbind_qp(qp);
	mutex_unlock(&counter->lock);

	return ret;
}

static void counter_history_stat_update(const struct rdma_counter *counter)
{
	struct ib_device *dev = counter->device;
	struct rdma_port_counter *port_counter;
	int i;

	port_counter = &dev->port_data[counter->port].port_counter;
	if (!port_counter->hstats)
		return;

	for (i = 0; i < counter->stats->num_counters; i++)
		port_counter->hstats->value[i] += counter->stats->value[i];
}

/**
 * rdma_get_counter_auto_mode - Find the counter that @qp should be bound
 *     with in auto mode
 *
 * Return: The counter (with ref-count increased) if found
 */
static struct rdma_counter *rdma_get_counter_auto_mode(struct ib_qp *qp,
						       u8 port)
{
	struct rdma_port_counter *port_counter;
	struct rdma_counter *counter = NULL;
	struct ib_device *dev = qp->device;
	struct rdma_restrack_entry *res;
	struct rdma_restrack_root *rt;
	unsigned long id = 0;

	port_counter = &dev->port_data[port].port_counter;
	rt = &dev->res[RDMA_RESTRACK_COUNTER];
	xa_lock(&rt->xa);
	xa_for_each(&rt->xa, id, res) {
		if (!rdma_is_visible_in_pid_ns(res))
			continue;

		counter = container_of(res, struct rdma_counter, res);
		if ((counter->device != qp->device) || (counter->port != port))
			goto next;

		if (auto_mode_match(qp, counter, port_counter->mode.mask))
			break;
next:
		counter = NULL;
	}

	if (counter && !kref_get_unless_zero(&counter->kref))
		counter = NULL;

	xa_unlock(&rt->xa);
	return counter;
}

static void rdma_counter_res_add(struct rdma_counter *counter,
				 struct ib_qp *qp)
{
	if (rdma_is_kernel_res(&qp->res)) {
		rdma_restrack_set_task(&counter->res, qp->res.kern_name);
		rdma_restrack_kadd(&counter->res);
	} else {
		rdma_restrack_attach_task(&counter->res, qp->res.task);
		rdma_restrack_uadd(&counter->res);
	}
}

static void counter_release(struct kref *kref)
{
	struct rdma_counter *counter;

	counter = container_of(kref, struct rdma_counter, kref);
	counter_history_stat_update(counter);
	counter->device->ops.counter_dealloc(counter);
	rdma_counter_free(counter);
}

/**
 * rdma_counter_bind_qp_auto - Check and bind the QP to a counter base on
 *   the auto-mode rule
 */
int rdma_counter_bind_qp_auto(struct ib_qp *qp, u8 port)
{
	struct rdma_port_counter *port_counter;
	struct ib_device *dev = qp->device;
	struct rdma_counter *counter;
	int ret;

	if (!rdma_is_port_valid(dev, port))
		return -EINVAL;

	port_counter = &dev->port_data[port].port_counter;
	if (port_counter->mode.mode != RDMA_COUNTER_MODE_AUTO)
		return 0;

	counter = rdma_get_counter_auto_mode(qp, port);
	if (counter) {
		ret = __rdma_counter_bind_qp(counter, qp);
		if (ret) {
			kref_put(&counter->kref, counter_release);
			return ret;
		}
	} else {
		counter = rdma_counter_alloc(dev, port, RDMA_COUNTER_MODE_AUTO);
		if (!counter)
			return -ENOMEM;

		auto_mode_init_counter(counter, qp, port_counter->mode.mask);

		ret = __rdma_counter_bind_qp(counter, qp);
		if (ret) {
			rdma_counter_free(counter);
			return ret;
		}

		rdma_counter_res_add(counter, qp);
	}

	return 0;
}

/**
 * rdma_counter_unbind_qp - Unbind a qp from a counter
 * @force:
 *   true - Decrease the counter ref-count anyway (e.g., qp destroy)
 */
int rdma_counter_unbind_qp(struct ib_qp *qp, bool force)
{
	struct rdma_counter *counter = qp->counter;
	int ret;

	if (!counter)
		return -EINVAL;

	ret = __rdma_counter_unbind_qp(qp);
	if (ret && !force)
		return ret;

	kref_put(&counter->kref, counter_release);
	return 0;
}

int rdma_counter_query_stats(struct rdma_counter *counter)
{
	struct ib_device *dev = counter->device;
	int ret;

	if (!dev->ops.counter_update_stats)
		return -EINVAL;

	mutex_lock(&counter->lock);
	ret = dev->ops.counter_update_stats(counter);
	mutex_unlock(&counter->lock);

	return ret;
}

static u64 get_running_counters_hwstat_sum(struct ib_device *dev,
					   u8 port, u32 index)
{
	struct rdma_restrack_entry *res;
	struct rdma_restrack_root *rt;
	struct rdma_counter *counter;
	unsigned long id = 0;
	u64 sum = 0;

	rt = &dev->res[RDMA_RESTRACK_COUNTER];
	xa_lock(&rt->xa);
	xa_for_each(&rt->xa, id, res) {
		if (!rdma_restrack_get(res))
			continue;

		xa_unlock(&rt->xa);

		counter = container_of(res, struct rdma_counter, res);
		if ((counter->device != dev) || (counter->port != port) ||
		    rdma_counter_query_stats(counter))
			goto next;

		sum += counter->stats->value[index];

next:
		xa_lock(&rt->xa);
		rdma_restrack_put(res);
	}

	xa_unlock(&rt->xa);
	return sum;
}

/**
 * rdma_counter_get_hwstat_value() - Get the sum value of all counters on a
 *   specific port, including the running ones and history data
 */
u64 rdma_counter_get_hwstat_value(struct ib_device *dev, u8 port, u32 index)
{
	struct rdma_port_counter *port_counter;
	u64 sum;

	port_counter = &dev->port_data[port].port_counter;
	if (!port_counter->hstats)
		return 0;

	sum = get_running_counters_hwstat_sum(dev, port, index);
	sum += port_counter->hstats->value[index];

	return sum;
}

static struct ib_qp *rdma_counter_get_qp(struct ib_device *dev, u32 qp_num)
{
	struct rdma_restrack_entry *res = NULL;
	struct ib_qp *qp = NULL;

	res = rdma_restrack_get_byid(dev, RDMA_RESTRACK_QP, qp_num);
	if (IS_ERR(res))
		return NULL;

	if (!rdma_is_visible_in_pid_ns(res))
		goto err;

	qp = container_of(res, struct ib_qp, res);
	if (qp->qp_type == IB_QPT_RAW_PACKET && !capable(CAP_NET_RAW))
		goto err;

	return qp;

err:
	rdma_restrack_put(res);
	return NULL;
}

static int rdma_counter_bind_qp_manual(struct rdma_counter *counter,
				       struct ib_qp *qp)
{
	if ((counter->device != qp->device) || (counter->port != qp->port))
		return -EINVAL;

	return __rdma_counter_bind_qp(counter, qp);
}

static struct rdma_counter *rdma_get_counter_by_id(struct ib_device *dev,
						   u32 counter_id)
{
	struct rdma_restrack_entry *res;
	struct rdma_counter *counter;

	res = rdma_restrack_get_byid(dev, RDMA_RESTRACK_COUNTER, counter_id);
	if (IS_ERR(res))
		return NULL;

	if (!rdma_is_visible_in_pid_ns(res)) {
		rdma_restrack_put(res);
		return NULL;
	}

	counter = container_of(res, struct rdma_counter, res);
	kref_get(&counter->kref);
	rdma_restrack_put(res);

	return counter;
}

/**
 * rdma_counter_bind_qpn() - Bind QP @qp_num to counter @counter_id
 */
int rdma_counter_bind_qpn(struct ib_device *dev, u8 port,
			  u32 qp_num, u32 counter_id)
{
	struct rdma_counter *counter;
	struct ib_qp *qp;
	int ret;

	qp = rdma_counter_get_qp(dev, qp_num);
	if (!qp)
		return -ENOENT;

	counter = rdma_get_counter_by_id(dev, counter_id);
	if (!counter) {
		ret = -ENOENT;
		goto err;
	}

	if (counter->res.task != qp->res.task) {
		ret = -EINVAL;
		goto err_task;
	}

	ret = rdma_counter_bind_qp_manual(counter, qp);
	if (ret)
		goto err_task;

	rdma_restrack_put(&qp->res);
	return 0;

err_task:
	kref_put(&counter->kref, counter_release);
err:
	rdma_restrack_put(&qp->res);
	return ret;
}

/**
 * rdma_counter_bind_qpn_alloc() - Alloc a counter and bind QP @qp_num to it
 *   The id of new counter is returned in @counter_id
 */
int rdma_counter_bind_qpn_alloc(struct ib_device *dev, u8 port,
				u32 qp_num, u32 *counter_id)
{
	struct rdma_counter *counter;
	struct ib_qp *qp;
	int ret;

	if (!rdma_is_port_valid(dev, port))
		return -EINVAL;

	if (!dev->port_data[port].port_counter.hstats)
		return -EOPNOTSUPP;

	qp = rdma_counter_get_qp(dev, qp_num);
	if (!qp)
		return -ENOENT;

	if (rdma_is_port_valid(dev, qp->port) && (qp->port != port)) {
		ret = -EINVAL;
		goto err;
	}

	counter = rdma_counter_alloc(dev, port, RDMA_COUNTER_MODE_MANUAL);
	if (!counter) {
		ret = -ENOMEM;
		goto err;
	}

	ret = rdma_counter_bind_qp_manual(counter, qp);
	if (ret)
		goto err_bind;

	if (counter_id)
		*counter_id = counter->id;

	rdma_counter_res_add(counter, qp);

	rdma_restrack_put(&qp->res);
	return ret;

err_bind:
	rdma_counter_free(counter);
err:
	rdma_restrack_put(&qp->res);
	return ret;
}

/**
 * rdma_counter_unbind_qpn() - Unbind QP @qp_num from a counter
 */
int rdma_counter_unbind_qpn(struct ib_device *dev, u8 port,
			    u32 qp_num, u32 counter_id)
{
	struct rdma_port_counter *port_counter;
	struct ib_qp *qp;
	int ret;

	if (!rdma_is_port_valid(dev, port))
		return -EINVAL;

	qp = rdma_counter_get_qp(dev, qp_num);
	if (!qp)
		return -ENOENT;

	if (rdma_is_port_valid(dev, qp->port) && (qp->port != port)) {
		ret = -EINVAL;
		goto out;
	}

	port_counter = &dev->port_data[port].port_counter;
	if (!qp->counter || qp->counter->id != counter_id ||
	    port_counter->mode.mode != RDMA_COUNTER_MODE_MANUAL) {
		ret = -EINVAL;
		goto out;
	}

	ret = rdma_counter_unbind_qp(qp, false);

out:
	rdma_restrack_put(&qp->res);
	return ret;
}

int rdma_counter_get_mode(struct ib_device *dev, u8 port,
			  enum rdma_nl_counter_mode *mode,
			  enum rdma_nl_counter_mask *mask)
{
	struct rdma_port_counter *port_counter;

	port_counter = &dev->port_data[port].port_counter;
	*mode = port_counter->mode.mode;
	*mask = port_counter->mode.mask;

	return 0;
}

void rdma_counter_init(struct ib_device *dev)
{
	struct rdma_port_counter *port_counter;
	u32 port;

	if (!dev->port_data)
		return;

	rdma_for_each_port(dev, port) {
		port_counter = &dev->port_data[port].port_counter;
		port_counter->mode.mode = RDMA_COUNTER_MODE_NONE;
		mutex_init(&port_counter->lock);

		if (!dev->ops.alloc_hw_stats)
			continue;

		port_counter->hstats = dev->ops.alloc_hw_stats(dev, port);
		if (!port_counter->hstats)
			goto fail;
	}

	return;

fail:
	rdma_for_each_port(dev, port) {
		port_counter = &dev->port_data[port].port_counter;
		kfree(port_counter->hstats);
		port_counter->hstats = NULL;
	}

	return;
}

void rdma_counter_release(struct ib_device *dev)
{
	struct rdma_port_counter *port_counter;
	u32 port;

	rdma_for_each_port(dev, port) {
		port_counter = &dev->port_data[port].port_counter;
		kfree(port_counter->hstats);
	}
}