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