Loading...
Note: File does not exist in v3.1.
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)
12
13static int __counter_set_mode(struct rdma_counter_mode *curr,
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 ((new_mask & (~ALL_AUTO_MODE_MASKS)) ||
19 (curr->mode != RDMA_COUNTER_MODE_NONE)))
20 return -EINVAL;
21
22 curr->mode = new_mode;
23 curr->mask = new_mask;
24 return 0;
25}
26
27/**
28 * rdma_counter_set_auto_mode() - Turn on/off per-port auto mode
29 *
30 * When @on is true, the @mask must be set; When @on is false, it goes
31 * into manual mode if there's any counter, so that the user is able to
32 * manually access them.
33 */
34int rdma_counter_set_auto_mode(struct ib_device *dev, u8 port,
35 bool on, enum rdma_nl_counter_mask mask)
36{
37 struct rdma_port_counter *port_counter;
38 int ret;
39
40 port_counter = &dev->port_data[port].port_counter;
41 if (!port_counter->hstats)
42 return -EOPNOTSUPP;
43
44 mutex_lock(&port_counter->lock);
45 if (on) {
46 ret = __counter_set_mode(&port_counter->mode,
47 RDMA_COUNTER_MODE_AUTO, mask);
48 } else {
49 if (port_counter->mode.mode != RDMA_COUNTER_MODE_AUTO) {
50 ret = -EINVAL;
51 goto out;
52 }
53
54 if (port_counter->num_counters)
55 ret = __counter_set_mode(&port_counter->mode,
56 RDMA_COUNTER_MODE_MANUAL, 0);
57 else
58 ret = __counter_set_mode(&port_counter->mode,
59 RDMA_COUNTER_MODE_NONE, 0);
60 }
61
62out:
63 mutex_unlock(&port_counter->lock);
64 return ret;
65}
66
67static struct rdma_counter *rdma_counter_alloc(struct ib_device *dev, u8 port,
68 enum rdma_nl_counter_mode mode)
69{
70 struct rdma_port_counter *port_counter;
71 struct rdma_counter *counter;
72 int ret;
73
74 if (!dev->ops.counter_dealloc || !dev->ops.counter_alloc_stats)
75 return NULL;
76
77 counter = kzalloc(sizeof(*counter), GFP_KERNEL);
78 if (!counter)
79 return NULL;
80
81 counter->device = dev;
82 counter->port = port;
83 counter->res.type = RDMA_RESTRACK_COUNTER;
84 counter->stats = dev->ops.counter_alloc_stats(counter);
85 if (!counter->stats)
86 goto err_stats;
87
88 port_counter = &dev->port_data[port].port_counter;
89 mutex_lock(&port_counter->lock);
90 if (mode == RDMA_COUNTER_MODE_MANUAL) {
91 ret = __counter_set_mode(&port_counter->mode,
92 RDMA_COUNTER_MODE_MANUAL, 0);
93 if (ret)
94 goto err_mode;
95 }
96
97 port_counter->num_counters++;
98 mutex_unlock(&port_counter->lock);
99
100 counter->mode.mode = mode;
101 kref_init(&counter->kref);
102 mutex_init(&counter->lock);
103
104 return counter;
105
106err_mode:
107 mutex_unlock(&port_counter->lock);
108 kfree(counter->stats);
109err_stats:
110 kfree(counter);
111 return NULL;
112}
113
114static void rdma_counter_free(struct rdma_counter *counter)
115{
116 struct rdma_port_counter *port_counter;
117
118 port_counter = &counter->device->port_data[counter->port].port_counter;
119 mutex_lock(&port_counter->lock);
120 port_counter->num_counters--;
121 if (!port_counter->num_counters &&
122 (port_counter->mode.mode == RDMA_COUNTER_MODE_MANUAL))
123 __counter_set_mode(&port_counter->mode, RDMA_COUNTER_MODE_NONE,
124 0);
125
126 mutex_unlock(&port_counter->lock);
127
128 rdma_restrack_del(&counter->res);
129 kfree(counter->stats);
130 kfree(counter);
131}
132
133static void auto_mode_init_counter(struct rdma_counter *counter,
134 const struct ib_qp *qp,
135 enum rdma_nl_counter_mask new_mask)
136{
137 struct auto_mode_param *param = &counter->mode.param;
138
139 counter->mode.mode = RDMA_COUNTER_MODE_AUTO;
140 counter->mode.mask = new_mask;
141
142 if (new_mask & RDMA_COUNTER_MASK_QP_TYPE)
143 param->qp_type = qp->qp_type;
144}
145
146static bool auto_mode_match(struct ib_qp *qp, struct rdma_counter *counter,
147 enum rdma_nl_counter_mask auto_mask)
148{
149 struct auto_mode_param *param = &counter->mode.param;
150 bool match = true;
151
152 if (!rdma_is_visible_in_pid_ns(&qp->res))
153 return false;
154
155 /* Ensure that counter belongs to the right PID */
156 if (task_pid_nr(counter->res.task) != task_pid_nr(qp->res.task))
157 return false;
158
159 if (auto_mask & RDMA_COUNTER_MASK_QP_TYPE)
160 match &= (param->qp_type == qp->qp_type);
161
162 return match;
163}
164
165static int __rdma_counter_bind_qp(struct rdma_counter *counter,
166 struct ib_qp *qp)
167{
168 int ret;
169
170 if (qp->counter)
171 return -EINVAL;
172
173 if (!qp->device->ops.counter_bind_qp)
174 return -EOPNOTSUPP;
175
176 mutex_lock(&counter->lock);
177 ret = qp->device->ops.counter_bind_qp(counter, qp);
178 mutex_unlock(&counter->lock);
179
180 return ret;
181}
182
183static int __rdma_counter_unbind_qp(struct ib_qp *qp)
184{
185 struct rdma_counter *counter = qp->counter;
186 int ret;
187
188 if (!qp->device->ops.counter_unbind_qp)
189 return -EOPNOTSUPP;
190
191 mutex_lock(&counter->lock);
192 ret = qp->device->ops.counter_unbind_qp(qp);
193 mutex_unlock(&counter->lock);
194
195 return ret;
196}
197
198static void counter_history_stat_update(const struct rdma_counter *counter)
199{
200 struct ib_device *dev = counter->device;
201 struct rdma_port_counter *port_counter;
202 int i;
203
204 port_counter = &dev->port_data[counter->port].port_counter;
205 if (!port_counter->hstats)
206 return;
207
208 for (i = 0; i < counter->stats->num_counters; i++)
209 port_counter->hstats->value[i] += counter->stats->value[i];
210}
211
212/**
213 * rdma_get_counter_auto_mode - Find the counter that @qp should be bound
214 * with in auto mode
215 *
216 * Return: The counter (with ref-count increased) if found
217 */
218static struct rdma_counter *rdma_get_counter_auto_mode(struct ib_qp *qp,
219 u8 port)
220{
221 struct rdma_port_counter *port_counter;
222 struct rdma_counter *counter = NULL;
223 struct ib_device *dev = qp->device;
224 struct rdma_restrack_entry *res;
225 struct rdma_restrack_root *rt;
226 unsigned long id = 0;
227
228 port_counter = &dev->port_data[port].port_counter;
229 rt = &dev->res[RDMA_RESTRACK_COUNTER];
230 xa_lock(&rt->xa);
231 xa_for_each(&rt->xa, id, res) {
232 if (!rdma_is_visible_in_pid_ns(res))
233 continue;
234
235 counter = container_of(res, struct rdma_counter, res);
236 if ((counter->device != qp->device) || (counter->port != port))
237 goto next;
238
239 if (auto_mode_match(qp, counter, port_counter->mode.mask))
240 break;
241next:
242 counter = NULL;
243 }
244
245 if (counter && !kref_get_unless_zero(&counter->kref))
246 counter = NULL;
247
248 xa_unlock(&rt->xa);
249 return counter;
250}
251
252static void rdma_counter_res_add(struct rdma_counter *counter,
253 struct ib_qp *qp)
254{
255 if (rdma_is_kernel_res(&qp->res)) {
256 rdma_restrack_set_task(&counter->res, qp->res.kern_name);
257 rdma_restrack_kadd(&counter->res);
258 } else {
259 rdma_restrack_attach_task(&counter->res, qp->res.task);
260 rdma_restrack_uadd(&counter->res);
261 }
262}
263
264static void counter_release(struct kref *kref)
265{
266 struct rdma_counter *counter;
267
268 counter = container_of(kref, struct rdma_counter, kref);
269 counter_history_stat_update(counter);
270 counter->device->ops.counter_dealloc(counter);
271 rdma_counter_free(counter);
272}
273
274/**
275 * rdma_counter_bind_qp_auto - Check and bind the QP to a counter base on
276 * the auto-mode rule
277 */
278int rdma_counter_bind_qp_auto(struct ib_qp *qp, u8 port)
279{
280 struct rdma_port_counter *port_counter;
281 struct ib_device *dev = qp->device;
282 struct rdma_counter *counter;
283 int ret;
284
285 if (!rdma_is_port_valid(dev, port))
286 return -EINVAL;
287
288 port_counter = &dev->port_data[port].port_counter;
289 if (port_counter->mode.mode != RDMA_COUNTER_MODE_AUTO)
290 return 0;
291
292 counter = rdma_get_counter_auto_mode(qp, port);
293 if (counter) {
294 ret = __rdma_counter_bind_qp(counter, qp);
295 if (ret) {
296 kref_put(&counter->kref, counter_release);
297 return ret;
298 }
299 } else {
300 counter = rdma_counter_alloc(dev, port, RDMA_COUNTER_MODE_AUTO);
301 if (!counter)
302 return -ENOMEM;
303
304 auto_mode_init_counter(counter, qp, port_counter->mode.mask);
305
306 ret = __rdma_counter_bind_qp(counter, qp);
307 if (ret) {
308 rdma_counter_free(counter);
309 return ret;
310 }
311
312 rdma_counter_res_add(counter, qp);
313 }
314
315 return 0;
316}
317
318/**
319 * rdma_counter_unbind_qp - Unbind a qp from a counter
320 * @force:
321 * true - Decrease the counter ref-count anyway (e.g., qp destroy)
322 */
323int rdma_counter_unbind_qp(struct ib_qp *qp, bool force)
324{
325 struct rdma_counter *counter = qp->counter;
326 int ret;
327
328 if (!counter)
329 return -EINVAL;
330
331 ret = __rdma_counter_unbind_qp(qp);
332 if (ret && !force)
333 return ret;
334
335 kref_put(&counter->kref, counter_release);
336 return 0;
337}
338
339int rdma_counter_query_stats(struct rdma_counter *counter)
340{
341 struct ib_device *dev = counter->device;
342 int ret;
343
344 if (!dev->ops.counter_update_stats)
345 return -EINVAL;
346
347 mutex_lock(&counter->lock);
348 ret = dev->ops.counter_update_stats(counter);
349 mutex_unlock(&counter->lock);
350
351 return ret;
352}
353
354static u64 get_running_counters_hwstat_sum(struct ib_device *dev,
355 u8 port, u32 index)
356{
357 struct rdma_restrack_entry *res;
358 struct rdma_restrack_root *rt;
359 struct rdma_counter *counter;
360 unsigned long id = 0;
361 u64 sum = 0;
362
363 rt = &dev->res[RDMA_RESTRACK_COUNTER];
364 xa_lock(&rt->xa);
365 xa_for_each(&rt->xa, id, res) {
366 if (!rdma_restrack_get(res))
367 continue;
368
369 xa_unlock(&rt->xa);
370
371 counter = container_of(res, struct rdma_counter, res);
372 if ((counter->device != dev) || (counter->port != port) ||
373 rdma_counter_query_stats(counter))
374 goto next;
375
376 sum += counter->stats->value[index];
377
378next:
379 xa_lock(&rt->xa);
380 rdma_restrack_put(res);
381 }
382
383 xa_unlock(&rt->xa);
384 return sum;
385}
386
387/**
388 * rdma_counter_get_hwstat_value() - Get the sum value of all counters on a
389 * specific port, including the running ones and history data
390 */
391u64 rdma_counter_get_hwstat_value(struct ib_device *dev, u8 port, u32 index)
392{
393 struct rdma_port_counter *port_counter;
394 u64 sum;
395
396 port_counter = &dev->port_data[port].port_counter;
397 if (!port_counter->hstats)
398 return 0;
399
400 sum = get_running_counters_hwstat_sum(dev, port, index);
401 sum += port_counter->hstats->value[index];
402
403 return sum;
404}
405
406static struct ib_qp *rdma_counter_get_qp(struct ib_device *dev, u32 qp_num)
407{
408 struct rdma_restrack_entry *res = NULL;
409 struct ib_qp *qp = NULL;
410
411 res = rdma_restrack_get_byid(dev, RDMA_RESTRACK_QP, qp_num);
412 if (IS_ERR(res))
413 return NULL;
414
415 if (!rdma_is_visible_in_pid_ns(res))
416 goto err;
417
418 qp = container_of(res, struct ib_qp, res);
419 if (qp->qp_type == IB_QPT_RAW_PACKET && !capable(CAP_NET_RAW))
420 goto err;
421
422 return qp;
423
424err:
425 rdma_restrack_put(res);
426 return NULL;
427}
428
429static int rdma_counter_bind_qp_manual(struct rdma_counter *counter,
430 struct ib_qp *qp)
431{
432 if ((counter->device != qp->device) || (counter->port != qp->port))
433 return -EINVAL;
434
435 return __rdma_counter_bind_qp(counter, qp);
436}
437
438static struct rdma_counter *rdma_get_counter_by_id(struct ib_device *dev,
439 u32 counter_id)
440{
441 struct rdma_restrack_entry *res;
442 struct rdma_counter *counter;
443
444 res = rdma_restrack_get_byid(dev, RDMA_RESTRACK_COUNTER, counter_id);
445 if (IS_ERR(res))
446 return NULL;
447
448 if (!rdma_is_visible_in_pid_ns(res)) {
449 rdma_restrack_put(res);
450 return NULL;
451 }
452
453 counter = container_of(res, struct rdma_counter, res);
454 kref_get(&counter->kref);
455 rdma_restrack_put(res);
456
457 return counter;
458}
459
460/**
461 * rdma_counter_bind_qpn() - Bind QP @qp_num to counter @counter_id
462 */
463int rdma_counter_bind_qpn(struct ib_device *dev, u8 port,
464 u32 qp_num, u32 counter_id)
465{
466 struct rdma_counter *counter;
467 struct ib_qp *qp;
468 int ret;
469
470 qp = rdma_counter_get_qp(dev, qp_num);
471 if (!qp)
472 return -ENOENT;
473
474 counter = rdma_get_counter_by_id(dev, counter_id);
475 if (!counter) {
476 ret = -ENOENT;
477 goto err;
478 }
479
480 if (counter->res.task != qp->res.task) {
481 ret = -EINVAL;
482 goto err_task;
483 }
484
485 ret = rdma_counter_bind_qp_manual(counter, qp);
486 if (ret)
487 goto err_task;
488
489 rdma_restrack_put(&qp->res);
490 return 0;
491
492err_task:
493 kref_put(&counter->kref, counter_release);
494err:
495 rdma_restrack_put(&qp->res);
496 return ret;
497}
498
499/**
500 * rdma_counter_bind_qpn_alloc() - Alloc a counter and bind QP @qp_num to it
501 * The id of new counter is returned in @counter_id
502 */
503int rdma_counter_bind_qpn_alloc(struct ib_device *dev, u8 port,
504 u32 qp_num, u32 *counter_id)
505{
506 struct rdma_counter *counter;
507 struct ib_qp *qp;
508 int ret;
509
510 if (!rdma_is_port_valid(dev, port))
511 return -EINVAL;
512
513 if (!dev->port_data[port].port_counter.hstats)
514 return -EOPNOTSUPP;
515
516 qp = rdma_counter_get_qp(dev, qp_num);
517 if (!qp)
518 return -ENOENT;
519
520 if (rdma_is_port_valid(dev, qp->port) && (qp->port != port)) {
521 ret = -EINVAL;
522 goto err;
523 }
524
525 counter = rdma_counter_alloc(dev, port, RDMA_COUNTER_MODE_MANUAL);
526 if (!counter) {
527 ret = -ENOMEM;
528 goto err;
529 }
530
531 ret = rdma_counter_bind_qp_manual(counter, qp);
532 if (ret)
533 goto err_bind;
534
535 if (counter_id)
536 *counter_id = counter->id;
537
538 rdma_counter_res_add(counter, qp);
539
540 rdma_restrack_put(&qp->res);
541 return ret;
542
543err_bind:
544 rdma_counter_free(counter);
545err:
546 rdma_restrack_put(&qp->res);
547 return ret;
548}
549
550/**
551 * rdma_counter_unbind_qpn() - Unbind QP @qp_num from a counter
552 */
553int rdma_counter_unbind_qpn(struct ib_device *dev, u8 port,
554 u32 qp_num, u32 counter_id)
555{
556 struct rdma_port_counter *port_counter;
557 struct ib_qp *qp;
558 int ret;
559
560 if (!rdma_is_port_valid(dev, port))
561 return -EINVAL;
562
563 qp = rdma_counter_get_qp(dev, qp_num);
564 if (!qp)
565 return -ENOENT;
566
567 if (rdma_is_port_valid(dev, qp->port) && (qp->port != port)) {
568 ret = -EINVAL;
569 goto out;
570 }
571
572 port_counter = &dev->port_data[port].port_counter;
573 if (!qp->counter || qp->counter->id != counter_id ||
574 port_counter->mode.mode != RDMA_COUNTER_MODE_MANUAL) {
575 ret = -EINVAL;
576 goto out;
577 }
578
579 ret = rdma_counter_unbind_qp(qp, false);
580
581out:
582 rdma_restrack_put(&qp->res);
583 return ret;
584}
585
586int rdma_counter_get_mode(struct ib_device *dev, u8 port,
587 enum rdma_nl_counter_mode *mode,
588 enum rdma_nl_counter_mask *mask)
589{
590 struct rdma_port_counter *port_counter;
591
592 port_counter = &dev->port_data[port].port_counter;
593 *mode = port_counter->mode.mode;
594 *mask = port_counter->mode.mask;
595
596 return 0;
597}
598
599void rdma_counter_init(struct ib_device *dev)
600{
601 struct rdma_port_counter *port_counter;
602 u32 port, i;
603
604 if (!dev->port_data)
605 return;
606
607 rdma_for_each_port(dev, port) {
608 port_counter = &dev->port_data[port].port_counter;
609 port_counter->mode.mode = RDMA_COUNTER_MODE_NONE;
610 mutex_init(&port_counter->lock);
611
612 if (!dev->ops.alloc_hw_stats)
613 continue;
614
615 port_counter->hstats = dev->ops.alloc_hw_stats(dev, port);
616 if (!port_counter->hstats)
617 goto fail;
618 }
619
620 return;
621
622fail:
623 for (i = port; i >= rdma_start_port(dev); i--) {
624 port_counter = &dev->port_data[port].port_counter;
625 kfree(port_counter->hstats);
626 port_counter->hstats = NULL;
627 mutex_destroy(&port_counter->lock);
628 }
629}
630
631void rdma_counter_release(struct ib_device *dev)
632{
633 struct rdma_port_counter *port_counter;
634 u32 port;
635
636 rdma_for_each_port(dev, port) {
637 port_counter = &dev->port_data[port].port_counter;
638 kfree(port_counter->hstats);
639 mutex_destroy(&port_counter->lock);
640 }
641}