1// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
2/*
3 * Copyright (c) 2019 Mellanox Technologies. All rights reserved.
4 */
5#include <rdma/ib_verbs.h>
6#include <rdma/rdma_counter.h>
7
8#include "core_priv.h"
9#include "restrack.h"
10
11#define ALL_AUTO_MODE_MASKS (RDMA_COUNTER_MASK_QP_TYPE | RDMA_COUNTER_MASK_PID)
12
13static int __counter_set_mode(struct rdma_port_counter *port_counter,
14 enum rdma_nl_counter_mode new_mode,
15 enum rdma_nl_counter_mask new_mask)
16{
17 if (new_mode == RDMA_COUNTER_MODE_AUTO) {
18 if (new_mask & (~ALL_AUTO_MODE_MASKS))
19 return -EINVAL;
20 if (port_counter->num_counters)
21 return -EBUSY;
22 }
23
24 port_counter->mode.mode = new_mode;
25 port_counter->mode.mask = new_mask;
26 return 0;
27}
28
29/*
30 * rdma_counter_set_auto_mode() - Turn on/off per-port auto mode
31 *
32 * @dev: Device to operate
33 * @port: Port to use
34 * @mask: Mask to configure
35 * @extack: Message to the user
36 *
37 * Return 0 on success. If counter mode wasn't changed then it is considered
38 * as success as well.
39 * Return -EBUSY when changing to auto mode while there are bounded counters.
40 *
41 */
42int rdma_counter_set_auto_mode(struct ib_device *dev, u32 port,
43 enum rdma_nl_counter_mask mask,
44 struct netlink_ext_ack *extack)
45{
46 struct rdma_port_counter *port_counter;
47 enum rdma_nl_counter_mode mode;
48 int ret;
49
50 port_counter = &dev->port_data[port].port_counter;
51 if (!port_counter->hstats)
52 return -EOPNOTSUPP;
53
54 mutex_lock(&port_counter->lock);
55 if (mask)
56 mode = RDMA_COUNTER_MODE_AUTO;
57 else
58 mode = (port_counter->num_counters) ? RDMA_COUNTER_MODE_MANUAL :
59 RDMA_COUNTER_MODE_NONE;
60
61 if (port_counter->mode.mode == mode &&
62 port_counter->mode.mask == mask) {
63 ret = 0;
64 goto out;
65 }
66
67 ret = __counter_set_mode(port_counter, new_mode: mode, new_mask: mask);
68
69out:
70 mutex_unlock(lock: &port_counter->lock);
71 if (ret == -EBUSY)
72 NL_SET_ERR_MSG(
73 extack,
74 "Modifying auto mode is not allowed when there is a bound QP");
75 return ret;
76}
77
78static void auto_mode_init_counter(struct rdma_counter *counter,
79 const struct ib_qp *qp,
80 enum rdma_nl_counter_mask new_mask)
81{
82 struct auto_mode_param *param = &counter->mode.param;
83
84 counter->mode.mode = RDMA_COUNTER_MODE_AUTO;
85 counter->mode.mask = new_mask;
86
87 if (new_mask & RDMA_COUNTER_MASK_QP_TYPE)
88 param->qp_type = qp->qp_type;
89}
90
91static int __rdma_counter_bind_qp(struct rdma_counter *counter,
92 struct ib_qp *qp)
93{
94 int ret;
95
96 if (qp->counter)
97 return -EINVAL;
98
99 if (!qp->device->ops.counter_bind_qp)
100 return -EOPNOTSUPP;
101
102 mutex_lock(&counter->lock);
103 ret = qp->device->ops.counter_bind_qp(counter, qp);
104 mutex_unlock(lock: &counter->lock);
105
106 return ret;
107}
108
109int rdma_counter_modify(struct ib_device *dev, u32 port,
110 unsigned int index, bool enable)
111{
112 struct rdma_hw_stats *stats;
113 int ret = 0;
114
115 if (!dev->ops.modify_hw_stat)
116 return -EOPNOTSUPP;
117
118 stats = ib_get_hw_stats_port(ibdev: dev, port_num: port);
119 if (!stats || index >= stats->num_counters ||
120 !(stats->descs[index].flags & IB_STAT_FLAG_OPTIONAL))
121 return -EINVAL;
122
123 mutex_lock(&stats->lock);
124
125 if (enable != test_bit(index, stats->is_disabled))
126 goto out;
127
128 ret = dev->ops.modify_hw_stat(dev, port, index, enable);
129 if (ret)
130 goto out;
131
132 if (enable)
133 clear_bit(nr: index, addr: stats->is_disabled);
134 else
135 set_bit(nr: index, addr: stats->is_disabled);
136out:
137 mutex_unlock(lock: &stats->lock);
138 return ret;
139}
140
141static struct rdma_counter *alloc_and_bind(struct ib_device *dev, u32 port,
142 struct ib_qp *qp,
143 enum rdma_nl_counter_mode mode)
144{
145 struct rdma_port_counter *port_counter;
146 struct rdma_counter *counter;
147 int ret;
148
149 if (!dev->ops.counter_dealloc || !dev->ops.counter_alloc_stats)
150 return NULL;
151
152 counter = kzalloc(size: sizeof(*counter), GFP_KERNEL);
153 if (!counter)
154 return NULL;
155
156 counter->device = dev;
157 counter->port = port;
158
159 rdma_restrack_new(res: &counter->res, type: RDMA_RESTRACK_COUNTER);
160 counter->stats = dev->ops.counter_alloc_stats(counter);
161 if (!counter->stats)
162 goto err_stats;
163
164 port_counter = &dev->port_data[port].port_counter;
165 mutex_lock(&port_counter->lock);
166 switch (mode) {
167 case RDMA_COUNTER_MODE_MANUAL:
168 ret = __counter_set_mode(port_counter, new_mode: RDMA_COUNTER_MODE_MANUAL,
169 new_mask: 0);
170 if (ret) {
171 mutex_unlock(lock: &port_counter->lock);
172 goto err_mode;
173 }
174 break;
175 case RDMA_COUNTER_MODE_AUTO:
176 auto_mode_init_counter(counter, qp, new_mask: port_counter->mode.mask);
177 break;
178 default:
179 ret = -EOPNOTSUPP;
180 mutex_unlock(lock: &port_counter->lock);
181 goto err_mode;
182 }
183
184 port_counter->num_counters++;
185 mutex_unlock(lock: &port_counter->lock);
186
187 counter->mode.mode = mode;
188 kref_init(kref: &counter->kref);
189 mutex_init(&counter->lock);
190
191 ret = __rdma_counter_bind_qp(counter, qp);
192 if (ret)
193 goto err_mode;
194
195 rdma_restrack_parent_name(dst: &counter->res, parent: &qp->res);
196 rdma_restrack_add(res: &counter->res);
197 return counter;
198
199err_mode:
200 rdma_free_hw_stats_struct(stats: counter->stats);
201err_stats:
202 rdma_restrack_put(res: &counter->res);
203 kfree(objp: counter);
204 return NULL;
205}
206
207static void rdma_counter_free(struct rdma_counter *counter)
208{
209 struct rdma_port_counter *port_counter;
210
211 port_counter = &counter->device->port_data[counter->port].port_counter;
212 mutex_lock(&port_counter->lock);
213 port_counter->num_counters--;
214 if (!port_counter->num_counters &&
215 (port_counter->mode.mode == RDMA_COUNTER_MODE_MANUAL))
216 __counter_set_mode(port_counter, new_mode: RDMA_COUNTER_MODE_NONE, new_mask: 0);
217
218 mutex_unlock(lock: &port_counter->lock);
219
220 rdma_restrack_del(res: &counter->res);
221 rdma_free_hw_stats_struct(stats: counter->stats);
222 kfree(objp: counter);
223}
224
225static bool auto_mode_match(struct ib_qp *qp, struct rdma_counter *counter,
226 enum rdma_nl_counter_mask auto_mask)
227{
228 struct auto_mode_param *param = &counter->mode.param;
229 bool match = true;
230
231 if (auto_mask & RDMA_COUNTER_MASK_QP_TYPE)
232 match &= (param->qp_type == qp->qp_type);
233
234 if (auto_mask & RDMA_COUNTER_MASK_PID)
235 match &= (task_pid_nr(tsk: counter->res.task) ==
236 task_pid_nr(tsk: qp->res.task));
237
238 return match;
239}
240
241static int __rdma_counter_unbind_qp(struct ib_qp *qp)
242{
243 struct rdma_counter *counter = qp->counter;
244 int ret;
245
246 if (!qp->device->ops.counter_unbind_qp)
247 return -EOPNOTSUPP;
248
249 mutex_lock(&counter->lock);
250 ret = qp->device->ops.counter_unbind_qp(qp);
251 mutex_unlock(lock: &counter->lock);
252
253 return ret;
254}
255
256static void counter_history_stat_update(struct rdma_counter *counter)
257{
258 struct ib_device *dev = counter->device;
259 struct rdma_port_counter *port_counter;
260 int i;
261
262 port_counter = &dev->port_data[counter->port].port_counter;
263 if (!port_counter->hstats)
264 return;
265
266 rdma_counter_query_stats(counter);
267
268 for (i = 0; i < counter->stats->num_counters; i++)
269 port_counter->hstats->value[i] += counter->stats->value[i];
270}
271
272/*
273 * rdma_get_counter_auto_mode - Find the counter that @qp should be bound
274 * with in auto mode
275 *
276 * Return: The counter (with ref-count increased) if found
277 */
278static struct rdma_counter *rdma_get_counter_auto_mode(struct ib_qp *qp,
279 u32 port)
280{
281 struct rdma_port_counter *port_counter;
282 struct rdma_counter *counter = NULL;
283 struct ib_device *dev = qp->device;
284 struct rdma_restrack_entry *res;
285 struct rdma_restrack_root *rt;
286 unsigned long id = 0;
287
288 port_counter = &dev->port_data[port].port_counter;
289 rt = &dev->res[RDMA_RESTRACK_COUNTER];
290 xa_lock(&rt->xa);
291 xa_for_each(&rt->xa, id, res) {
292 counter = container_of(res, struct rdma_counter, res);
293 if ((counter->device != qp->device) || (counter->port != port))
294 goto next;
295
296 if (auto_mode_match(qp, counter, auto_mask: port_counter->mode.mask))
297 break;
298next:
299 counter = NULL;
300 }
301
302 if (counter && !kref_get_unless_zero(kref: &counter->kref))
303 counter = NULL;
304
305 xa_unlock(&rt->xa);
306 return counter;
307}
308
309static void counter_release(struct kref *kref)
310{
311 struct rdma_counter *counter;
312
313 counter = container_of(kref, struct rdma_counter, kref);
314 counter_history_stat_update(counter);
315 counter->device->ops.counter_dealloc(counter);
316 rdma_counter_free(counter);
317}
318
319/*
320 * rdma_counter_bind_qp_auto - Check and bind the QP to a counter base on
321 * the auto-mode rule
322 */
323int rdma_counter_bind_qp_auto(struct ib_qp *qp, u32 port)
324{
325 struct rdma_port_counter *port_counter;
326 struct ib_device *dev = qp->device;
327 struct rdma_counter *counter;
328 int ret;
329
330 if (!rdma_restrack_is_tracked(res: &qp->res) || rdma_is_kernel_res(res: &qp->res))
331 return 0;
332
333 if (!rdma_is_port_valid(device: dev, port))
334 return -EINVAL;
335
336 port_counter = &dev->port_data[port].port_counter;
337 if (port_counter->mode.mode != RDMA_COUNTER_MODE_AUTO)
338 return 0;
339
340 counter = rdma_get_counter_auto_mode(qp, port);
341 if (counter) {
342 ret = __rdma_counter_bind_qp(counter, qp);
343 if (ret) {
344 kref_put(kref: &counter->kref, release: counter_release);
345 return ret;
346 }
347 } else {
348 counter = alloc_and_bind(dev, port, qp, mode: RDMA_COUNTER_MODE_AUTO);
349 if (!counter)
350 return -ENOMEM;
351 }
352
353 return 0;
354}
355
356/*
357 * rdma_counter_unbind_qp - Unbind a qp from a counter
358 * @force:
359 * true - Decrease the counter ref-count anyway (e.g., qp destroy)
360 */
361int rdma_counter_unbind_qp(struct ib_qp *qp, bool force)
362{
363 struct rdma_counter *counter = qp->counter;
364 int ret;
365
366 if (!counter)
367 return -EINVAL;
368
369 ret = __rdma_counter_unbind_qp(qp);
370 if (ret && !force)
371 return ret;
372
373 kref_put(kref: &counter->kref, release: counter_release);
374 return 0;
375}
376
377int rdma_counter_query_stats(struct rdma_counter *counter)
378{
379 struct ib_device *dev = counter->device;
380 int ret;
381
382 if (!dev->ops.counter_update_stats)
383 return -EINVAL;
384
385 mutex_lock(&counter->lock);
386 ret = dev->ops.counter_update_stats(counter);
387 mutex_unlock(lock: &counter->lock);
388
389 return ret;
390}
391
392static u64 get_running_counters_hwstat_sum(struct ib_device *dev,
393 u32 port, u32 index)
394{
395 struct rdma_restrack_entry *res;
396 struct rdma_restrack_root *rt;
397 struct rdma_counter *counter;
398 unsigned long id = 0;
399 u64 sum = 0;
400
401 rt = &dev->res[RDMA_RESTRACK_COUNTER];
402 xa_lock(&rt->xa);
403 xa_for_each(&rt->xa, id, res) {
404 if (!rdma_restrack_get(res))
405 continue;
406
407 xa_unlock(&rt->xa);
408
409 counter = container_of(res, struct rdma_counter, res);
410 if ((counter->device != dev) || (counter->port != port) ||
411 rdma_counter_query_stats(counter))
412 goto next;
413
414 sum += counter->stats->value[index];
415
416next:
417 xa_lock(&rt->xa);
418 rdma_restrack_put(res);
419 }
420
421 xa_unlock(&rt->xa);
422 return sum;
423}
424
425/*
426 * rdma_counter_get_hwstat_value() - Get the sum value of all counters on a
427 * specific port, including the running ones and history data
428 */
429u64 rdma_counter_get_hwstat_value(struct ib_device *dev, u32 port, u32 index)
430{
431 struct rdma_port_counter *port_counter;
432 u64 sum;
433
434 port_counter = &dev->port_data[port].port_counter;
435 if (!port_counter->hstats)
436 return 0;
437
438 sum = get_running_counters_hwstat_sum(dev, port, index);
439 sum += port_counter->hstats->value[index];
440
441 return sum;
442}
443
444static struct ib_qp *rdma_counter_get_qp(struct ib_device *dev, u32 qp_num)
445{
446 struct rdma_restrack_entry *res = NULL;
447 struct ib_qp *qp = NULL;
448
449 res = rdma_restrack_get_byid(dev, type: RDMA_RESTRACK_QP, id: qp_num);
450 if (IS_ERR(ptr: res))
451 return NULL;
452
453 qp = container_of(res, struct ib_qp, res);
454 if (qp->qp_type == IB_QPT_RAW_PACKET && !capable(CAP_NET_RAW))
455 goto err;
456
457 return qp;
458
459err:
460 rdma_restrack_put(res);
461 return NULL;
462}
463
464static struct rdma_counter *rdma_get_counter_by_id(struct ib_device *dev,
465 u32 counter_id)
466{
467 struct rdma_restrack_entry *res;
468 struct rdma_counter *counter;
469
470 res = rdma_restrack_get_byid(dev, type: RDMA_RESTRACK_COUNTER, id: counter_id);
471 if (IS_ERR(ptr: res))
472 return NULL;
473
474 counter = container_of(res, struct rdma_counter, res);
475 kref_get(kref: &counter->kref);
476 rdma_restrack_put(res);
477
478 return counter;
479}
480
481/*
482 * rdma_counter_bind_qpn() - Bind QP @qp_num to counter @counter_id
483 */
484int rdma_counter_bind_qpn(struct ib_device *dev, u32 port,
485 u32 qp_num, u32 counter_id)
486{
487 struct rdma_port_counter *port_counter;
488 struct rdma_counter *counter;
489 struct ib_qp *qp;
490 int ret;
491
492 port_counter = &dev->port_data[port].port_counter;
493 if (port_counter->mode.mode == RDMA_COUNTER_MODE_AUTO)
494 return -EINVAL;
495
496 qp = rdma_counter_get_qp(dev, qp_num);
497 if (!qp)
498 return -ENOENT;
499
500 counter = rdma_get_counter_by_id(dev, counter_id);
501 if (!counter) {
502 ret = -ENOENT;
503 goto err;
504 }
505
506 if (rdma_is_kernel_res(res: &counter->res) != rdma_is_kernel_res(res: &qp->res)) {
507 ret = -EINVAL;
508 goto err_task;
509 }
510
511 if ((counter->device != qp->device) || (counter->port != qp->port)) {
512 ret = -EINVAL;
513 goto err_task;
514 }
515
516 ret = __rdma_counter_bind_qp(counter, qp);
517 if (ret)
518 goto err_task;
519
520 rdma_restrack_put(res: &qp->res);
521 return 0;
522
523err_task:
524 kref_put(kref: &counter->kref, release: counter_release);
525err:
526 rdma_restrack_put(res: &qp->res);
527 return ret;
528}
529
530/*
531 * rdma_counter_bind_qpn_alloc() - Alloc a counter and bind QP @qp_num to it
532 * The id of new counter is returned in @counter_id
533 */
534int rdma_counter_bind_qpn_alloc(struct ib_device *dev, u32 port,
535 u32 qp_num, u32 *counter_id)
536{
537 struct rdma_port_counter *port_counter;
538 struct rdma_counter *counter;
539 struct ib_qp *qp;
540 int ret;
541
542 if (!rdma_is_port_valid(device: dev, port))
543 return -EINVAL;
544
545 port_counter = &dev->port_data[port].port_counter;
546 if (!port_counter->hstats)
547 return -EOPNOTSUPP;
548
549 if (port_counter->mode.mode == RDMA_COUNTER_MODE_AUTO)
550 return -EINVAL;
551
552 qp = rdma_counter_get_qp(dev, qp_num);
553 if (!qp)
554 return -ENOENT;
555
556 if (rdma_is_port_valid(device: dev, port: qp->port) && (qp->port != port)) {
557 ret = -EINVAL;
558 goto err;
559 }
560
561 counter = alloc_and_bind(dev, port, qp, mode: RDMA_COUNTER_MODE_MANUAL);
562 if (!counter) {
563 ret = -ENOMEM;
564 goto err;
565 }
566
567 if (counter_id)
568 *counter_id = counter->id;
569
570 rdma_restrack_put(res: &qp->res);
571 return 0;
572
573err:
574 rdma_restrack_put(res: &qp->res);
575 return ret;
576}
577
578/*
579 * rdma_counter_unbind_qpn() - Unbind QP @qp_num from a counter
580 */
581int rdma_counter_unbind_qpn(struct ib_device *dev, u32 port,
582 u32 qp_num, u32 counter_id)
583{
584 struct rdma_port_counter *port_counter;
585 struct ib_qp *qp;
586 int ret;
587
588 if (!rdma_is_port_valid(device: dev, port))
589 return -EINVAL;
590
591 qp = rdma_counter_get_qp(dev, qp_num);
592 if (!qp)
593 return -ENOENT;
594
595 if (rdma_is_port_valid(device: dev, port: qp->port) && (qp->port != port)) {
596 ret = -EINVAL;
597 goto out;
598 }
599
600 port_counter = &dev->port_data[port].port_counter;
601 if (!qp->counter || qp->counter->id != counter_id ||
602 port_counter->mode.mode != RDMA_COUNTER_MODE_MANUAL) {
603 ret = -EINVAL;
604 goto out;
605 }
606
607 ret = rdma_counter_unbind_qp(qp, force: false);
608
609out:
610 rdma_restrack_put(res: &qp->res);
611 return ret;
612}
613
614int rdma_counter_get_mode(struct ib_device *dev, u32 port,
615 enum rdma_nl_counter_mode *mode,
616 enum rdma_nl_counter_mask *mask)
617{
618 struct rdma_port_counter *port_counter;
619
620 port_counter = &dev->port_data[port].port_counter;
621 *mode = port_counter->mode.mode;
622 *mask = port_counter->mode.mask;
623
624 return 0;
625}
626
627void rdma_counter_init(struct ib_device *dev)
628{
629 struct rdma_port_counter *port_counter;
630 u32 port, i;
631
632 if (!dev->port_data)
633 return;
634
635 rdma_for_each_port(dev, port) {
636 port_counter = &dev->port_data[port].port_counter;
637 port_counter->mode.mode = RDMA_COUNTER_MODE_NONE;
638 mutex_init(&port_counter->lock);
639
640 if (!dev->ops.alloc_hw_port_stats)
641 continue;
642
643 port_counter->hstats = dev->ops.alloc_hw_port_stats(dev, port);
644 if (!port_counter->hstats)
645 goto fail;
646 }
647
648 return;
649
650fail:
651 for (i = port; i >= rdma_start_port(device: dev); i--) {
652 port_counter = &dev->port_data[port].port_counter;
653 rdma_free_hw_stats_struct(stats: port_counter->hstats);
654 port_counter->hstats = NULL;
655 mutex_destroy(lock: &port_counter->lock);
656 }
657}
658
659void rdma_counter_release(struct ib_device *dev)
660{
661 struct rdma_port_counter *port_counter;
662 u32 port;
663
664 rdma_for_each_port(dev, port) {
665 port_counter = &dev->port_data[port].port_counter;
666 rdma_free_hw_stats_struct(stats: port_counter->hstats);
667 mutex_destroy(lock: &port_counter->lock);
668 }
669}
670

source code of linux/drivers/infiniband/core/counters.c