1// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
2/* Copyright (c) 2021, NVIDIA CORPORATION & AFFILIATES. All rights reserved. */
3
4#include "eswitch.h"
5#include "lib/mlx5.h"
6#include "esw/qos.h"
7#include "en/port.h"
8#define CREATE_TRACE_POINTS
9#include "diag/qos_tracepoint.h"
10
11/* Minimum supported BW share value by the HW is 1 Mbit/sec */
12#define MLX5_MIN_BW_SHARE 1
13
14#define MLX5_RATE_TO_BW_SHARE(rate, divider, limit) \
15 min_t(u32, max_t(u32, DIV_ROUND_UP(rate, divider), MLX5_MIN_BW_SHARE), limit)
16
17struct mlx5_esw_rate_group {
18 u32 tsar_ix;
19 u32 max_rate;
20 u32 min_rate;
21 u32 bw_share;
22 struct list_head list;
23};
24
25static int esw_qos_tsar_config(struct mlx5_core_dev *dev, u32 *sched_ctx,
26 u32 tsar_ix, u32 max_rate, u32 bw_share)
27{
28 u32 bitmask = 0;
29
30 if (!MLX5_CAP_GEN(dev, qos) || !MLX5_CAP_QOS(dev, esw_scheduling))
31 return -EOPNOTSUPP;
32
33 MLX5_SET(scheduling_context, sched_ctx, max_average_bw, max_rate);
34 MLX5_SET(scheduling_context, sched_ctx, bw_share, bw_share);
35 bitmask |= MODIFY_SCHEDULING_ELEMENT_IN_MODIFY_BITMASK_MAX_AVERAGE_BW;
36 bitmask |= MODIFY_SCHEDULING_ELEMENT_IN_MODIFY_BITMASK_BW_SHARE;
37
38 return mlx5_modify_scheduling_element_cmd(dev,
39 hierarchy: SCHEDULING_HIERARCHY_E_SWITCH,
40 context: sched_ctx,
41 element_id: tsar_ix,
42 modify_bitmask: bitmask);
43}
44
45static int esw_qos_group_config(struct mlx5_eswitch *esw, struct mlx5_esw_rate_group *group,
46 u32 max_rate, u32 bw_share, struct netlink_ext_ack *extack)
47{
48 u32 sched_ctx[MLX5_ST_SZ_DW(scheduling_context)] = {};
49 struct mlx5_core_dev *dev = esw->dev;
50 int err;
51
52 err = esw_qos_tsar_config(dev, sched_ctx,
53 tsar_ix: group->tsar_ix,
54 max_rate, bw_share);
55 if (err)
56 NL_SET_ERR_MSG_MOD(extack, "E-Switch modify group TSAR element failed");
57
58 trace_mlx5_esw_group_qos_config(dev, group, tsar_ix: group->tsar_ix, bw_share, max_rate);
59
60 return err;
61}
62
63static int esw_qos_vport_config(struct mlx5_eswitch *esw,
64 struct mlx5_vport *vport,
65 u32 max_rate, u32 bw_share,
66 struct netlink_ext_ack *extack)
67{
68 u32 sched_ctx[MLX5_ST_SZ_DW(scheduling_context)] = {};
69 struct mlx5_core_dev *dev = esw->dev;
70 int err;
71
72 if (!vport->qos.enabled)
73 return -EIO;
74
75 err = esw_qos_tsar_config(dev, sched_ctx, tsar_ix: vport->qos.esw_tsar_ix,
76 max_rate, bw_share);
77 if (err) {
78 esw_warn(esw->dev,
79 "E-Switch modify TSAR vport element failed (vport=%d,err=%d)\n",
80 vport->vport, err);
81 NL_SET_ERR_MSG_MOD(extack, "E-Switch modify TSAR vport element failed");
82 return err;
83 }
84
85 trace_mlx5_esw_vport_qos_config(vport, bw_share, max_rate);
86
87 return 0;
88}
89
90static u32 esw_qos_calculate_min_rate_divider(struct mlx5_eswitch *esw,
91 struct mlx5_esw_rate_group *group,
92 bool group_level)
93{
94 u32 fw_max_bw_share = MLX5_CAP_QOS(esw->dev, max_tsar_bw_share);
95 struct mlx5_vport *evport;
96 u32 max_guarantee = 0;
97 unsigned long i;
98
99 if (group_level) {
100 struct mlx5_esw_rate_group *group;
101
102 list_for_each_entry(group, &esw->qos.groups, list) {
103 if (group->min_rate < max_guarantee)
104 continue;
105 max_guarantee = group->min_rate;
106 }
107 } else {
108 mlx5_esw_for_each_vport(esw, i, evport) {
109 if (!evport->enabled || !evport->qos.enabled ||
110 evport->qos.group != group || evport->qos.min_rate < max_guarantee)
111 continue;
112 max_guarantee = evport->qos.min_rate;
113 }
114 }
115
116 if (max_guarantee)
117 return max_t(u32, max_guarantee / fw_max_bw_share, 1);
118
119 /* If vports min rate divider is 0 but their group has bw_share configured, then
120 * need to set bw_share for vports to minimal value.
121 */
122 if (!group_level && !max_guarantee && group && group->bw_share)
123 return 1;
124 return 0;
125}
126
127static u32 esw_qos_calc_bw_share(u32 min_rate, u32 divider, u32 fw_max)
128{
129 if (divider)
130 return MLX5_RATE_TO_BW_SHARE(min_rate, divider, fw_max);
131
132 return 0;
133}
134
135static int esw_qos_normalize_vports_min_rate(struct mlx5_eswitch *esw,
136 struct mlx5_esw_rate_group *group,
137 struct netlink_ext_ack *extack)
138{
139 u32 fw_max_bw_share = MLX5_CAP_QOS(esw->dev, max_tsar_bw_share);
140 u32 divider = esw_qos_calculate_min_rate_divider(esw, group, group_level: false);
141 struct mlx5_vport *evport;
142 unsigned long i;
143 u32 bw_share;
144 int err;
145
146 mlx5_esw_for_each_vport(esw, i, evport) {
147 if (!evport->enabled || !evport->qos.enabled || evport->qos.group != group)
148 continue;
149 bw_share = esw_qos_calc_bw_share(min_rate: evport->qos.min_rate, divider, fw_max: fw_max_bw_share);
150
151 if (bw_share == evport->qos.bw_share)
152 continue;
153
154 err = esw_qos_vport_config(esw, vport: evport, max_rate: evport->qos.max_rate, bw_share, extack);
155 if (err)
156 return err;
157
158 evport->qos.bw_share = bw_share;
159 }
160
161 return 0;
162}
163
164static int esw_qos_normalize_groups_min_rate(struct mlx5_eswitch *esw, u32 divider,
165 struct netlink_ext_ack *extack)
166{
167 u32 fw_max_bw_share = MLX5_CAP_QOS(esw->dev, max_tsar_bw_share);
168 struct mlx5_esw_rate_group *group;
169 u32 bw_share;
170 int err;
171
172 list_for_each_entry(group, &esw->qos.groups, list) {
173 bw_share = esw_qos_calc_bw_share(min_rate: group->min_rate, divider, fw_max: fw_max_bw_share);
174
175 if (bw_share == group->bw_share)
176 continue;
177
178 err = esw_qos_group_config(esw, group, max_rate: group->max_rate, bw_share, extack);
179 if (err)
180 return err;
181
182 group->bw_share = bw_share;
183
184 /* All the group's vports need to be set with default bw_share
185 * to enable them with QOS
186 */
187 err = esw_qos_normalize_vports_min_rate(esw, group, extack);
188
189 if (err)
190 return err;
191 }
192
193 return 0;
194}
195
196static int esw_qos_set_vport_min_rate(struct mlx5_eswitch *esw, struct mlx5_vport *evport,
197 u32 min_rate, struct netlink_ext_ack *extack)
198{
199 u32 fw_max_bw_share, previous_min_rate;
200 bool min_rate_supported;
201 int err;
202
203 lockdep_assert_held(&esw->state_lock);
204 fw_max_bw_share = MLX5_CAP_QOS(esw->dev, max_tsar_bw_share);
205 min_rate_supported = MLX5_CAP_QOS(esw->dev, esw_bw_share) &&
206 fw_max_bw_share >= MLX5_MIN_BW_SHARE;
207 if (min_rate && !min_rate_supported)
208 return -EOPNOTSUPP;
209 if (min_rate == evport->qos.min_rate)
210 return 0;
211
212 previous_min_rate = evport->qos.min_rate;
213 evport->qos.min_rate = min_rate;
214 err = esw_qos_normalize_vports_min_rate(esw, group: evport->qos.group, extack);
215 if (err)
216 evport->qos.min_rate = previous_min_rate;
217
218 return err;
219}
220
221static int esw_qos_set_vport_max_rate(struct mlx5_eswitch *esw, struct mlx5_vport *evport,
222 u32 max_rate, struct netlink_ext_ack *extack)
223{
224 u32 act_max_rate = max_rate;
225 bool max_rate_supported;
226 int err;
227
228 lockdep_assert_held(&esw->state_lock);
229 max_rate_supported = MLX5_CAP_QOS(esw->dev, esw_rate_limit);
230
231 if (max_rate && !max_rate_supported)
232 return -EOPNOTSUPP;
233 if (max_rate == evport->qos.max_rate)
234 return 0;
235
236 /* If parent group has rate limit need to set to group
237 * value when new max rate is 0.
238 */
239 if (evport->qos.group && !max_rate)
240 act_max_rate = evport->qos.group->max_rate;
241
242 err = esw_qos_vport_config(esw, vport: evport, max_rate: act_max_rate, bw_share: evport->qos.bw_share, extack);
243
244 if (!err)
245 evport->qos.max_rate = max_rate;
246
247 return err;
248}
249
250static int esw_qos_set_group_min_rate(struct mlx5_eswitch *esw, struct mlx5_esw_rate_group *group,
251 u32 min_rate, struct netlink_ext_ack *extack)
252{
253 u32 fw_max_bw_share = MLX5_CAP_QOS(esw->dev, max_tsar_bw_share);
254 struct mlx5_core_dev *dev = esw->dev;
255 u32 previous_min_rate, divider;
256 int err;
257
258 if (!(MLX5_CAP_QOS(dev, esw_bw_share) && fw_max_bw_share >= MLX5_MIN_BW_SHARE))
259 return -EOPNOTSUPP;
260
261 if (min_rate == group->min_rate)
262 return 0;
263
264 previous_min_rate = group->min_rate;
265 group->min_rate = min_rate;
266 divider = esw_qos_calculate_min_rate_divider(esw, group, group_level: true);
267 err = esw_qos_normalize_groups_min_rate(esw, divider, extack);
268 if (err) {
269 group->min_rate = previous_min_rate;
270 NL_SET_ERR_MSG_MOD(extack, "E-Switch group min rate setting failed");
271
272 /* Attempt restoring previous configuration */
273 divider = esw_qos_calculate_min_rate_divider(esw, group, group_level: true);
274 if (esw_qos_normalize_groups_min_rate(esw, divider, extack))
275 NL_SET_ERR_MSG_MOD(extack, "E-Switch BW share restore failed");
276 }
277
278 return err;
279}
280
281static int esw_qos_set_group_max_rate(struct mlx5_eswitch *esw,
282 struct mlx5_esw_rate_group *group,
283 u32 max_rate, struct netlink_ext_ack *extack)
284{
285 struct mlx5_vport *vport;
286 unsigned long i;
287 int err;
288
289 if (group->max_rate == max_rate)
290 return 0;
291
292 err = esw_qos_group_config(esw, group, max_rate, bw_share: group->bw_share, extack);
293 if (err)
294 return err;
295
296 group->max_rate = max_rate;
297
298 /* Any unlimited vports in the group should be set
299 * with the value of the group.
300 */
301 mlx5_esw_for_each_vport(esw, i, vport) {
302 if (!vport->enabled || !vport->qos.enabled ||
303 vport->qos.group != group || vport->qos.max_rate)
304 continue;
305
306 err = esw_qos_vport_config(esw, vport, max_rate, bw_share: vport->qos.bw_share, extack);
307 if (err)
308 NL_SET_ERR_MSG_MOD(extack,
309 "E-Switch vport implicit rate limit setting failed");
310 }
311
312 return err;
313}
314
315static int esw_qos_vport_create_sched_element(struct mlx5_eswitch *esw,
316 struct mlx5_vport *vport,
317 u32 max_rate, u32 bw_share)
318{
319 u32 sched_ctx[MLX5_ST_SZ_DW(scheduling_context)] = {};
320 struct mlx5_esw_rate_group *group = vport->qos.group;
321 struct mlx5_core_dev *dev = esw->dev;
322 u32 parent_tsar_ix;
323 void *vport_elem;
324 int err;
325
326 parent_tsar_ix = group ? group->tsar_ix : esw->qos.root_tsar_ix;
327 MLX5_SET(scheduling_context, sched_ctx, element_type,
328 SCHEDULING_CONTEXT_ELEMENT_TYPE_VPORT);
329 vport_elem = MLX5_ADDR_OF(scheduling_context, sched_ctx, element_attributes);
330 MLX5_SET(vport_element, vport_elem, vport_number, vport->vport);
331 MLX5_SET(scheduling_context, sched_ctx, parent_element_id, parent_tsar_ix);
332 MLX5_SET(scheduling_context, sched_ctx, max_average_bw, max_rate);
333 MLX5_SET(scheduling_context, sched_ctx, bw_share, bw_share);
334
335 err = mlx5_create_scheduling_element_cmd(dev,
336 hierarchy: SCHEDULING_HIERARCHY_E_SWITCH,
337 context: sched_ctx,
338 element_id: &vport->qos.esw_tsar_ix);
339 if (err) {
340 esw_warn(esw->dev, "E-Switch create TSAR vport element failed (vport=%d,err=%d)\n",
341 vport->vport, err);
342 return err;
343 }
344
345 return 0;
346}
347
348static int esw_qos_update_group_scheduling_element(struct mlx5_eswitch *esw,
349 struct mlx5_vport *vport,
350 struct mlx5_esw_rate_group *curr_group,
351 struct mlx5_esw_rate_group *new_group,
352 struct netlink_ext_ack *extack)
353{
354 u32 max_rate;
355 int err;
356
357 err = mlx5_destroy_scheduling_element_cmd(dev: esw->dev,
358 hierarchy: SCHEDULING_HIERARCHY_E_SWITCH,
359 element_id: vport->qos.esw_tsar_ix);
360 if (err) {
361 NL_SET_ERR_MSG_MOD(extack, "E-Switch destroy TSAR vport element failed");
362 return err;
363 }
364
365 vport->qos.group = new_group;
366 max_rate = vport->qos.max_rate ? vport->qos.max_rate : new_group->max_rate;
367
368 /* If vport is unlimited, we set the group's value.
369 * Therefore, if the group is limited it will apply to
370 * the vport as well and if not, vport will remain unlimited.
371 */
372 err = esw_qos_vport_create_sched_element(esw, vport, max_rate, bw_share: vport->qos.bw_share);
373 if (err) {
374 NL_SET_ERR_MSG_MOD(extack, "E-Switch vport group set failed.");
375 goto err_sched;
376 }
377
378 return 0;
379
380err_sched:
381 vport->qos.group = curr_group;
382 max_rate = vport->qos.max_rate ? vport->qos.max_rate : curr_group->max_rate;
383 if (esw_qos_vport_create_sched_element(esw, vport, max_rate, bw_share: vport->qos.bw_share))
384 esw_warn(esw->dev, "E-Switch vport group restore failed (vport=%d)\n",
385 vport->vport);
386
387 return err;
388}
389
390static int esw_qos_vport_update_group(struct mlx5_eswitch *esw,
391 struct mlx5_vport *vport,
392 struct mlx5_esw_rate_group *group,
393 struct netlink_ext_ack *extack)
394{
395 struct mlx5_esw_rate_group *new_group, *curr_group;
396 int err;
397
398 if (!vport->enabled)
399 return -EINVAL;
400
401 curr_group = vport->qos.group;
402 new_group = group ?: esw->qos.group0;
403 if (curr_group == new_group)
404 return 0;
405
406 err = esw_qos_update_group_scheduling_element(esw, vport, curr_group, new_group, extack);
407 if (err)
408 return err;
409
410 /* Recalculate bw share weights of old and new groups */
411 if (vport->qos.bw_share || new_group->bw_share) {
412 esw_qos_normalize_vports_min_rate(esw, group: curr_group, extack);
413 esw_qos_normalize_vports_min_rate(esw, group: new_group, extack);
414 }
415
416 return 0;
417}
418
419static struct mlx5_esw_rate_group *
420__esw_qos_create_rate_group(struct mlx5_eswitch *esw, struct netlink_ext_ack *extack)
421{
422 u32 tsar_ctx[MLX5_ST_SZ_DW(scheduling_context)] = {};
423 struct mlx5_esw_rate_group *group;
424 u32 divider;
425 int err;
426
427 group = kzalloc(size: sizeof(*group), GFP_KERNEL);
428 if (!group)
429 return ERR_PTR(error: -ENOMEM);
430
431 MLX5_SET(scheduling_context, tsar_ctx, parent_element_id,
432 esw->qos.root_tsar_ix);
433 err = mlx5_create_scheduling_element_cmd(dev: esw->dev,
434 hierarchy: SCHEDULING_HIERARCHY_E_SWITCH,
435 context: tsar_ctx,
436 element_id: &group->tsar_ix);
437 if (err) {
438 NL_SET_ERR_MSG_MOD(extack, "E-Switch create TSAR for group failed");
439 goto err_sched_elem;
440 }
441
442 list_add_tail(new: &group->list, head: &esw->qos.groups);
443
444 divider = esw_qos_calculate_min_rate_divider(esw, group, group_level: true);
445 if (divider) {
446 err = esw_qos_normalize_groups_min_rate(esw, divider, extack);
447 if (err) {
448 NL_SET_ERR_MSG_MOD(extack, "E-Switch groups normalization failed");
449 goto err_min_rate;
450 }
451 }
452 trace_mlx5_esw_group_qos_create(dev: esw->dev, group, tsar_ix: group->tsar_ix);
453
454 return group;
455
456err_min_rate:
457 list_del(entry: &group->list);
458 if (mlx5_destroy_scheduling_element_cmd(dev: esw->dev,
459 hierarchy: SCHEDULING_HIERARCHY_E_SWITCH,
460 element_id: group->tsar_ix))
461 NL_SET_ERR_MSG_MOD(extack, "E-Switch destroy TSAR for group failed");
462err_sched_elem:
463 kfree(objp: group);
464 return ERR_PTR(error: err);
465}
466
467static int esw_qos_get(struct mlx5_eswitch *esw, struct netlink_ext_ack *extack);
468static void esw_qos_put(struct mlx5_eswitch *esw);
469
470static struct mlx5_esw_rate_group *
471esw_qos_create_rate_group(struct mlx5_eswitch *esw, struct netlink_ext_ack *extack)
472{
473 struct mlx5_esw_rate_group *group;
474 int err;
475
476 if (!MLX5_CAP_QOS(esw->dev, log_esw_max_sched_depth))
477 return ERR_PTR(error: -EOPNOTSUPP);
478
479 err = esw_qos_get(esw, extack);
480 if (err)
481 return ERR_PTR(error: err);
482
483 group = __esw_qos_create_rate_group(esw, extack);
484 if (IS_ERR(ptr: group))
485 esw_qos_put(esw);
486
487 return group;
488}
489
490static int __esw_qos_destroy_rate_group(struct mlx5_eswitch *esw,
491 struct mlx5_esw_rate_group *group,
492 struct netlink_ext_ack *extack)
493{
494 u32 divider;
495 int err;
496
497 list_del(entry: &group->list);
498
499 divider = esw_qos_calculate_min_rate_divider(esw, NULL, group_level: true);
500 err = esw_qos_normalize_groups_min_rate(esw, divider, extack);
501 if (err)
502 NL_SET_ERR_MSG_MOD(extack, "E-Switch groups' normalization failed");
503
504 err = mlx5_destroy_scheduling_element_cmd(dev: esw->dev,
505 hierarchy: SCHEDULING_HIERARCHY_E_SWITCH,
506 element_id: group->tsar_ix);
507 if (err)
508 NL_SET_ERR_MSG_MOD(extack, "E-Switch destroy TSAR_ID failed");
509
510 trace_mlx5_esw_group_qos_destroy(dev: esw->dev, group, tsar_ix: group->tsar_ix);
511
512 kfree(objp: group);
513
514 return err;
515}
516
517static int esw_qos_destroy_rate_group(struct mlx5_eswitch *esw,
518 struct mlx5_esw_rate_group *group,
519 struct netlink_ext_ack *extack)
520{
521 int err;
522
523 err = __esw_qos_destroy_rate_group(esw, group, extack);
524 esw_qos_put(esw);
525
526 return err;
527}
528
529static bool esw_qos_element_type_supported(struct mlx5_core_dev *dev, int type)
530{
531 switch (type) {
532 case SCHEDULING_CONTEXT_ELEMENT_TYPE_TSAR:
533 return MLX5_CAP_QOS(dev, esw_element_type) &
534 ELEMENT_TYPE_CAP_MASK_TASR;
535 case SCHEDULING_CONTEXT_ELEMENT_TYPE_VPORT:
536 return MLX5_CAP_QOS(dev, esw_element_type) &
537 ELEMENT_TYPE_CAP_MASK_VPORT;
538 case SCHEDULING_CONTEXT_ELEMENT_TYPE_VPORT_TC:
539 return MLX5_CAP_QOS(dev, esw_element_type) &
540 ELEMENT_TYPE_CAP_MASK_VPORT_TC;
541 case SCHEDULING_CONTEXT_ELEMENT_TYPE_PARA_VPORT_TC:
542 return MLX5_CAP_QOS(dev, esw_element_type) &
543 ELEMENT_TYPE_CAP_MASK_PARA_VPORT_TC;
544 }
545 return false;
546}
547
548static int esw_qos_create(struct mlx5_eswitch *esw, struct netlink_ext_ack *extack)
549{
550 u32 tsar_ctx[MLX5_ST_SZ_DW(scheduling_context)] = {};
551 struct mlx5_core_dev *dev = esw->dev;
552 __be32 *attr;
553 int err;
554
555 if (!MLX5_CAP_GEN(dev, qos) || !MLX5_CAP_QOS(dev, esw_scheduling))
556 return -EOPNOTSUPP;
557
558 if (!esw_qos_element_type_supported(dev, type: SCHEDULING_CONTEXT_ELEMENT_TYPE_TSAR))
559 return -EOPNOTSUPP;
560
561 MLX5_SET(scheduling_context, tsar_ctx, element_type,
562 SCHEDULING_CONTEXT_ELEMENT_TYPE_TSAR);
563
564 attr = MLX5_ADDR_OF(scheduling_context, tsar_ctx, element_attributes);
565 *attr = cpu_to_be32(TSAR_ELEMENT_TSAR_TYPE_DWRR << 16);
566
567 err = mlx5_create_scheduling_element_cmd(dev,
568 hierarchy: SCHEDULING_HIERARCHY_E_SWITCH,
569 context: tsar_ctx,
570 element_id: &esw->qos.root_tsar_ix);
571 if (err) {
572 esw_warn(dev, "E-Switch create root TSAR failed (%d)\n", err);
573 return err;
574 }
575
576 INIT_LIST_HEAD(list: &esw->qos.groups);
577 if (MLX5_CAP_QOS(dev, log_esw_max_sched_depth)) {
578 esw->qos.group0 = __esw_qos_create_rate_group(esw, extack);
579 if (IS_ERR(ptr: esw->qos.group0)) {
580 esw_warn(dev, "E-Switch create rate group 0 failed (%ld)\n",
581 PTR_ERR(esw->qos.group0));
582 err = PTR_ERR(ptr: esw->qos.group0);
583 goto err_group0;
584 }
585 }
586 refcount_set(r: &esw->qos.refcnt, n: 1);
587
588 return 0;
589
590err_group0:
591 if (mlx5_destroy_scheduling_element_cmd(dev: esw->dev, hierarchy: SCHEDULING_HIERARCHY_E_SWITCH,
592 element_id: esw->qos.root_tsar_ix))
593 esw_warn(esw->dev, "E-Switch destroy root TSAR failed.\n");
594
595 return err;
596}
597
598static void esw_qos_destroy(struct mlx5_eswitch *esw)
599{
600 int err;
601
602 if (esw->qos.group0)
603 __esw_qos_destroy_rate_group(esw, group: esw->qos.group0, NULL);
604
605 err = mlx5_destroy_scheduling_element_cmd(dev: esw->dev,
606 hierarchy: SCHEDULING_HIERARCHY_E_SWITCH,
607 element_id: esw->qos.root_tsar_ix);
608 if (err)
609 esw_warn(esw->dev, "E-Switch destroy root TSAR failed (%d)\n", err);
610}
611
612static int esw_qos_get(struct mlx5_eswitch *esw, struct netlink_ext_ack *extack)
613{
614 int err = 0;
615
616 lockdep_assert_held(&esw->state_lock);
617
618 if (!refcount_inc_not_zero(r: &esw->qos.refcnt)) {
619 /* esw_qos_create() set refcount to 1 only on success.
620 * No need to decrement on failure.
621 */
622 err = esw_qos_create(esw, extack);
623 }
624
625 return err;
626}
627
628static void esw_qos_put(struct mlx5_eswitch *esw)
629{
630 lockdep_assert_held(&esw->state_lock);
631 if (refcount_dec_and_test(r: &esw->qos.refcnt))
632 esw_qos_destroy(esw);
633}
634
635static int esw_qos_vport_enable(struct mlx5_eswitch *esw, struct mlx5_vport *vport,
636 u32 max_rate, u32 bw_share, struct netlink_ext_ack *extack)
637{
638 int err;
639
640 lockdep_assert_held(&esw->state_lock);
641 if (vport->qos.enabled)
642 return 0;
643
644 err = esw_qos_get(esw, extack);
645 if (err)
646 return err;
647
648 vport->qos.group = esw->qos.group0;
649
650 err = esw_qos_vport_create_sched_element(esw, vport, max_rate, bw_share);
651 if (err)
652 goto err_out;
653
654 vport->qos.enabled = true;
655 trace_mlx5_esw_vport_qos_create(vport, bw_share, max_rate);
656
657 return 0;
658
659err_out:
660 esw_qos_put(esw);
661
662 return err;
663}
664
665void mlx5_esw_qos_vport_disable(struct mlx5_eswitch *esw, struct mlx5_vport *vport)
666{
667 int err;
668
669 lockdep_assert_held(&esw->state_lock);
670 if (!vport->qos.enabled)
671 return;
672 WARN(vport->qos.group && vport->qos.group != esw->qos.group0,
673 "Disabling QoS on port before detaching it from group");
674
675 err = mlx5_destroy_scheduling_element_cmd(dev: esw->dev,
676 hierarchy: SCHEDULING_HIERARCHY_E_SWITCH,
677 element_id: vport->qos.esw_tsar_ix);
678 if (err)
679 esw_warn(esw->dev, "E-Switch destroy TSAR vport element failed (vport=%d,err=%d)\n",
680 vport->vport, err);
681
682 memset(&vport->qos, 0, sizeof(vport->qos));
683 trace_mlx5_esw_vport_qos_destroy(vport);
684
685 esw_qos_put(esw);
686}
687
688int mlx5_esw_qos_set_vport_rate(struct mlx5_eswitch *esw, struct mlx5_vport *vport,
689 u32 max_rate, u32 min_rate)
690{
691 int err;
692
693 lockdep_assert_held(&esw->state_lock);
694 err = esw_qos_vport_enable(esw, vport, max_rate: 0, bw_share: 0, NULL);
695 if (err)
696 return err;
697
698 err = esw_qos_set_vport_min_rate(esw, evport: vport, min_rate, NULL);
699 if (!err)
700 err = esw_qos_set_vport_max_rate(esw, evport: vport, max_rate, NULL);
701
702 return err;
703}
704
705static u32 mlx5_esw_qos_lag_link_speed_get_locked(struct mlx5_core_dev *mdev)
706{
707 struct ethtool_link_ksettings lksettings;
708 struct net_device *slave, *master;
709 u32 speed = SPEED_UNKNOWN;
710
711 /* Lock ensures a stable reference to master and slave netdevice
712 * while port speed of master is queried.
713 */
714 ASSERT_RTNL();
715
716 slave = mlx5_uplink_netdev_get(mdev);
717 if (!slave)
718 goto out;
719
720 master = netdev_master_upper_dev_get(dev: slave);
721 if (master && !__ethtool_get_link_ksettings(dev: master, link_ksettings: &lksettings))
722 speed = lksettings.base.speed;
723
724out:
725 return speed;
726}
727
728static int mlx5_esw_qos_max_link_speed_get(struct mlx5_core_dev *mdev, u32 *link_speed_max,
729 bool hold_rtnl_lock, struct netlink_ext_ack *extack)
730{
731 int err;
732
733 if (!mlx5_lag_is_active(dev: mdev))
734 goto skip_lag;
735
736 if (hold_rtnl_lock)
737 rtnl_lock();
738
739 *link_speed_max = mlx5_esw_qos_lag_link_speed_get_locked(mdev);
740
741 if (hold_rtnl_lock)
742 rtnl_unlock();
743
744 if (*link_speed_max != (u32)SPEED_UNKNOWN)
745 return 0;
746
747skip_lag:
748 err = mlx5_port_max_linkspeed(mdev, speed: link_speed_max);
749 if (err)
750 NL_SET_ERR_MSG_MOD(extack, "Failed to get link maximum speed");
751
752 return err;
753}
754
755static int mlx5_esw_qos_link_speed_verify(struct mlx5_core_dev *mdev,
756 const char *name, u32 link_speed_max,
757 u64 value, struct netlink_ext_ack *extack)
758{
759 if (value > link_speed_max) {
760 pr_err("%s rate value %lluMbps exceed link maximum speed %u.\n",
761 name, value, link_speed_max);
762 NL_SET_ERR_MSG_MOD(extack, "TX rate value exceed link maximum speed");
763 return -EINVAL;
764 }
765
766 return 0;
767}
768
769int mlx5_esw_qos_modify_vport_rate(struct mlx5_eswitch *esw, u16 vport_num, u32 rate_mbps)
770{
771 u32 ctx[MLX5_ST_SZ_DW(scheduling_context)] = {};
772 struct mlx5_vport *vport;
773 u32 link_speed_max;
774 u32 bitmask;
775 int err;
776
777 vport = mlx5_eswitch_get_vport(esw, vport_num);
778 if (IS_ERR(ptr: vport))
779 return PTR_ERR(ptr: vport);
780
781 if (rate_mbps) {
782 err = mlx5_esw_qos_max_link_speed_get(mdev: esw->dev, link_speed_max: &link_speed_max, hold_rtnl_lock: false, NULL);
783 if (err)
784 return err;
785
786 err = mlx5_esw_qos_link_speed_verify(mdev: esw->dev, name: "Police",
787 link_speed_max, value: rate_mbps, NULL);
788 if (err)
789 return err;
790 }
791
792 mutex_lock(&esw->state_lock);
793 if (!vport->qos.enabled) {
794 /* Eswitch QoS wasn't enabled yet. Enable it and vport QoS. */
795 err = esw_qos_vport_enable(esw, vport, max_rate: rate_mbps, bw_share: vport->qos.bw_share, NULL);
796 } else {
797 MLX5_SET(scheduling_context, ctx, max_average_bw, rate_mbps);
798
799 bitmask = MODIFY_SCHEDULING_ELEMENT_IN_MODIFY_BITMASK_MAX_AVERAGE_BW;
800 err = mlx5_modify_scheduling_element_cmd(dev: esw->dev,
801 hierarchy: SCHEDULING_HIERARCHY_E_SWITCH,
802 context: ctx,
803 element_id: vport->qos.esw_tsar_ix,
804 modify_bitmask: bitmask);
805 }
806 mutex_unlock(lock: &esw->state_lock);
807
808 return err;
809}
810
811#define MLX5_LINKSPEED_UNIT 125000 /* 1Mbps in Bps */
812
813/* Converts bytes per second value passed in a pointer into megabits per
814 * second, rewriting last. If converted rate exceed link speed or is not a
815 * fraction of Mbps - returns error.
816 */
817static int esw_qos_devlink_rate_to_mbps(struct mlx5_core_dev *mdev, const char *name,
818 u64 *rate, struct netlink_ext_ack *extack)
819{
820 u32 link_speed_max, remainder;
821 u64 value;
822 int err;
823
824 value = div_u64_rem(dividend: *rate, MLX5_LINKSPEED_UNIT, remainder: &remainder);
825 if (remainder) {
826 pr_err("%s rate value %lluBps not in link speed units of 1Mbps.\n",
827 name, *rate);
828 NL_SET_ERR_MSG_MOD(extack, "TX rate value not in link speed units of 1Mbps");
829 return -EINVAL;
830 }
831
832 err = mlx5_esw_qos_max_link_speed_get(mdev, link_speed_max: &link_speed_max, hold_rtnl_lock: true, extack);
833 if (err)
834 return err;
835
836 err = mlx5_esw_qos_link_speed_verify(mdev, name, link_speed_max, value, extack);
837 if (err)
838 return err;
839
840 *rate = value;
841 return 0;
842}
843
844/* Eswitch devlink rate API */
845
846int mlx5_esw_devlink_rate_leaf_tx_share_set(struct devlink_rate *rate_leaf, void *priv,
847 u64 tx_share, struct netlink_ext_ack *extack)
848{
849 struct mlx5_vport *vport = priv;
850 struct mlx5_eswitch *esw;
851 int err;
852
853 esw = vport->dev->priv.eswitch;
854 if (!mlx5_esw_allowed(esw))
855 return -EPERM;
856
857 err = esw_qos_devlink_rate_to_mbps(mdev: vport->dev, name: "tx_share", rate: &tx_share, extack);
858 if (err)
859 return err;
860
861 mutex_lock(&esw->state_lock);
862 err = esw_qos_vport_enable(esw, vport, max_rate: 0, bw_share: 0, extack);
863 if (err)
864 goto unlock;
865
866 err = esw_qos_set_vport_min_rate(esw, evport: vport, min_rate: tx_share, extack);
867unlock:
868 mutex_unlock(lock: &esw->state_lock);
869 return err;
870}
871
872int mlx5_esw_devlink_rate_leaf_tx_max_set(struct devlink_rate *rate_leaf, void *priv,
873 u64 tx_max, struct netlink_ext_ack *extack)
874{
875 struct mlx5_vport *vport = priv;
876 struct mlx5_eswitch *esw;
877 int err;
878
879 esw = vport->dev->priv.eswitch;
880 if (!mlx5_esw_allowed(esw))
881 return -EPERM;
882
883 err = esw_qos_devlink_rate_to_mbps(mdev: vport->dev, name: "tx_max", rate: &tx_max, extack);
884 if (err)
885 return err;
886
887 mutex_lock(&esw->state_lock);
888 err = esw_qos_vport_enable(esw, vport, max_rate: 0, bw_share: 0, extack);
889 if (err)
890 goto unlock;
891
892 err = esw_qos_set_vport_max_rate(esw, evport: vport, max_rate: tx_max, extack);
893unlock:
894 mutex_unlock(lock: &esw->state_lock);
895 return err;
896}
897
898int mlx5_esw_devlink_rate_node_tx_share_set(struct devlink_rate *rate_node, void *priv,
899 u64 tx_share, struct netlink_ext_ack *extack)
900{
901 struct mlx5_core_dev *dev = devlink_priv(devlink: rate_node->devlink);
902 struct mlx5_eswitch *esw = dev->priv.eswitch;
903 struct mlx5_esw_rate_group *group = priv;
904 int err;
905
906 err = esw_qos_devlink_rate_to_mbps(mdev: dev, name: "tx_share", rate: &tx_share, extack);
907 if (err)
908 return err;
909
910 mutex_lock(&esw->state_lock);
911 err = esw_qos_set_group_min_rate(esw, group, min_rate: tx_share, extack);
912 mutex_unlock(lock: &esw->state_lock);
913 return err;
914}
915
916int mlx5_esw_devlink_rate_node_tx_max_set(struct devlink_rate *rate_node, void *priv,
917 u64 tx_max, struct netlink_ext_ack *extack)
918{
919 struct mlx5_core_dev *dev = devlink_priv(devlink: rate_node->devlink);
920 struct mlx5_eswitch *esw = dev->priv.eswitch;
921 struct mlx5_esw_rate_group *group = priv;
922 int err;
923
924 err = esw_qos_devlink_rate_to_mbps(mdev: dev, name: "tx_max", rate: &tx_max, extack);
925 if (err)
926 return err;
927
928 mutex_lock(&esw->state_lock);
929 err = esw_qos_set_group_max_rate(esw, group, max_rate: tx_max, extack);
930 mutex_unlock(lock: &esw->state_lock);
931 return err;
932}
933
934int mlx5_esw_devlink_rate_node_new(struct devlink_rate *rate_node, void **priv,
935 struct netlink_ext_ack *extack)
936{
937 struct mlx5_esw_rate_group *group;
938 struct mlx5_eswitch *esw;
939 int err = 0;
940
941 esw = mlx5_devlink_eswitch_get(devlink: rate_node->devlink);
942 if (IS_ERR(ptr: esw))
943 return PTR_ERR(ptr: esw);
944
945 mutex_lock(&esw->state_lock);
946 if (esw->mode != MLX5_ESWITCH_OFFLOADS) {
947 NL_SET_ERR_MSG_MOD(extack,
948 "Rate node creation supported only in switchdev mode");
949 err = -EOPNOTSUPP;
950 goto unlock;
951 }
952
953 group = esw_qos_create_rate_group(esw, extack);
954 if (IS_ERR(ptr: group)) {
955 err = PTR_ERR(ptr: group);
956 goto unlock;
957 }
958
959 *priv = group;
960unlock:
961 mutex_unlock(lock: &esw->state_lock);
962 return err;
963}
964
965int mlx5_esw_devlink_rate_node_del(struct devlink_rate *rate_node, void *priv,
966 struct netlink_ext_ack *extack)
967{
968 struct mlx5_esw_rate_group *group = priv;
969 struct mlx5_eswitch *esw;
970 int err;
971
972 esw = mlx5_devlink_eswitch_get(devlink: rate_node->devlink);
973 if (IS_ERR(ptr: esw))
974 return PTR_ERR(ptr: esw);
975
976 mutex_lock(&esw->state_lock);
977 err = esw_qos_destroy_rate_group(esw, group, extack);
978 mutex_unlock(lock: &esw->state_lock);
979 return err;
980}
981
982int mlx5_esw_qos_vport_update_group(struct mlx5_eswitch *esw,
983 struct mlx5_vport *vport,
984 struct mlx5_esw_rate_group *group,
985 struct netlink_ext_ack *extack)
986{
987 int err = 0;
988
989 mutex_lock(&esw->state_lock);
990 if (!vport->qos.enabled && !group)
991 goto unlock;
992
993 err = esw_qos_vport_enable(esw, vport, max_rate: 0, bw_share: 0, extack);
994 if (!err)
995 err = esw_qos_vport_update_group(esw, vport, group, extack);
996unlock:
997 mutex_unlock(lock: &esw->state_lock);
998 return err;
999}
1000
1001int mlx5_esw_devlink_rate_parent_set(struct devlink_rate *devlink_rate,
1002 struct devlink_rate *parent,
1003 void *priv, void *parent_priv,
1004 struct netlink_ext_ack *extack)
1005{
1006 struct mlx5_esw_rate_group *group;
1007 struct mlx5_vport *vport = priv;
1008
1009 if (!parent)
1010 return mlx5_esw_qos_vport_update_group(esw: vport->dev->priv.eswitch,
1011 vport, NULL, extack);
1012
1013 group = parent_priv;
1014 return mlx5_esw_qos_vport_update_group(esw: vport->dev->priv.eswitch, vport, group, extack);
1015}
1016

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source code of linux/drivers/net/ethernet/mellanox/mlx5/core/esw/qos.c