1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * net/sched/sch_mqprio.c
4 *
5 * Copyright (c) 2010 John Fastabend <john.r.fastabend@intel.com>
6 */
7
8 #include <linux/ethtool_netlink.h>
9 #include <linux/types.h>
10 #include <linux/slab.h>
11 #include <linux/kernel.h>
12 #include <linux/string.h>
13 #include <linux/errno.h>
14 #include <linux/skbuff.h>
15 #include <linux/module.h>
16 #include <net/netlink.h>
17 #include <net/pkt_sched.h>
18 #include <net/sch_generic.h>
19 #include <net/pkt_cls.h>
20
21 #include "sch_mqprio_lib.h"
22
23 struct mqprio_sched {
24 struct Qdisc **qdiscs;
25 u16 mode;
26 u16 shaper;
27 int hw_offload;
28 u32 flags;
29 u64 min_rate[TC_QOPT_MAX_QUEUE];
30 u64 max_rate[TC_QOPT_MAX_QUEUE];
31 u32 fp[TC_QOPT_MAX_QUEUE];
32 };
33
mqprio_enable_offload(struct Qdisc * sch,const struct tc_mqprio_qopt * qopt,struct netlink_ext_ack * extack)34 static int mqprio_enable_offload(struct Qdisc *sch,
35 const struct tc_mqprio_qopt *qopt,
36 struct netlink_ext_ack *extack)
37 {
38 struct mqprio_sched *priv = qdisc_priv(sch);
39 struct net_device *dev = qdisc_dev(sch);
40 struct tc_mqprio_qopt_offload mqprio = {
41 .qopt = *qopt,
42 .extack = extack,
43 };
44 int err, i;
45
46 switch (priv->mode) {
47 case TC_MQPRIO_MODE_DCB:
48 if (priv->shaper != TC_MQPRIO_SHAPER_DCB)
49 return -EINVAL;
50 break;
51 case TC_MQPRIO_MODE_CHANNEL:
52 mqprio.flags = priv->flags;
53 if (priv->flags & TC_MQPRIO_F_MODE)
54 mqprio.mode = priv->mode;
55 if (priv->flags & TC_MQPRIO_F_SHAPER)
56 mqprio.shaper = priv->shaper;
57 if (priv->flags & TC_MQPRIO_F_MIN_RATE)
58 for (i = 0; i < mqprio.qopt.num_tc; i++)
59 mqprio.min_rate[i] = priv->min_rate[i];
60 if (priv->flags & TC_MQPRIO_F_MAX_RATE)
61 for (i = 0; i < mqprio.qopt.num_tc; i++)
62 mqprio.max_rate[i] = priv->max_rate[i];
63 break;
64 default:
65 return -EINVAL;
66 }
67
68 mqprio_fp_to_offload(priv->fp, &mqprio);
69
70 err = dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_QDISC_MQPRIO,
71 &mqprio);
72 if (err)
73 return err;
74
75 priv->hw_offload = mqprio.qopt.hw;
76
77 return 0;
78 }
79
mqprio_disable_offload(struct Qdisc * sch)80 static void mqprio_disable_offload(struct Qdisc *sch)
81 {
82 struct tc_mqprio_qopt_offload mqprio = { { 0 } };
83 struct mqprio_sched *priv = qdisc_priv(sch);
84 struct net_device *dev = qdisc_dev(sch);
85
86 switch (priv->mode) {
87 case TC_MQPRIO_MODE_DCB:
88 case TC_MQPRIO_MODE_CHANNEL:
89 dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_QDISC_MQPRIO,
90 &mqprio);
91 break;
92 }
93 }
94
mqprio_destroy(struct Qdisc * sch)95 static void mqprio_destroy(struct Qdisc *sch)
96 {
97 struct net_device *dev = qdisc_dev(sch);
98 struct mqprio_sched *priv = qdisc_priv(sch);
99 unsigned int ntx;
100
101 if (priv->qdiscs) {
102 for (ntx = 0;
103 ntx < dev->num_tx_queues && priv->qdiscs[ntx];
104 ntx++)
105 qdisc_put(priv->qdiscs[ntx]);
106 kfree(priv->qdiscs);
107 }
108
109 if (priv->hw_offload && dev->netdev_ops->ndo_setup_tc)
110 mqprio_disable_offload(sch);
111 else
112 netdev_set_num_tc(dev, 0);
113 }
114
mqprio_parse_opt(struct net_device * dev,struct tc_mqprio_qopt * qopt,const struct tc_mqprio_caps * caps,struct netlink_ext_ack * extack)115 static int mqprio_parse_opt(struct net_device *dev, struct tc_mqprio_qopt *qopt,
116 const struct tc_mqprio_caps *caps,
117 struct netlink_ext_ack *extack)
118 {
119 int err;
120
121 /* Limit qopt->hw to maximum supported offload value. Drivers have
122 * the option of overriding this later if they don't support the a
123 * given offload type.
124 */
125 if (qopt->hw > TC_MQPRIO_HW_OFFLOAD_MAX)
126 qopt->hw = TC_MQPRIO_HW_OFFLOAD_MAX;
127
128 /* If hardware offload is requested, we will leave 3 options to the
129 * device driver:
130 * - populate the queue counts itself (and ignore what was requested)
131 * - validate the provided queue counts by itself (and apply them)
132 * - request queue count validation here (and apply them)
133 */
134 err = mqprio_validate_qopt(dev, qopt,
135 !qopt->hw || caps->validate_queue_counts,
136 false, extack);
137 if (err)
138 return err;
139
140 /* If ndo_setup_tc is not present then hardware doesn't support offload
141 * and we should return an error.
142 */
143 if (qopt->hw && !dev->netdev_ops->ndo_setup_tc) {
144 NL_SET_ERR_MSG(extack,
145 "Device does not support hardware offload");
146 return -EINVAL;
147 }
148
149 return 0;
150 }
151
152 static const struct
153 nla_policy mqprio_tc_entry_policy[TCA_MQPRIO_TC_ENTRY_MAX + 1] = {
154 [TCA_MQPRIO_TC_ENTRY_INDEX] = NLA_POLICY_MAX(NLA_U32,
155 TC_QOPT_MAX_QUEUE - 1),
156 [TCA_MQPRIO_TC_ENTRY_FP] = NLA_POLICY_RANGE(NLA_U32,
157 TC_FP_EXPRESS,
158 TC_FP_PREEMPTIBLE),
159 };
160
161 static const struct nla_policy mqprio_policy[TCA_MQPRIO_MAX + 1] = {
162 [TCA_MQPRIO_MODE] = { .len = sizeof(u16) },
163 [TCA_MQPRIO_SHAPER] = { .len = sizeof(u16) },
164 [TCA_MQPRIO_MIN_RATE64] = { .type = NLA_NESTED },
165 [TCA_MQPRIO_MAX_RATE64] = { .type = NLA_NESTED },
166 [TCA_MQPRIO_TC_ENTRY] = { .type = NLA_NESTED },
167 };
168
mqprio_parse_tc_entry(u32 fp[TC_QOPT_MAX_QUEUE],struct nlattr * opt,unsigned long * seen_tcs,struct netlink_ext_ack * extack)169 static int mqprio_parse_tc_entry(u32 fp[TC_QOPT_MAX_QUEUE],
170 struct nlattr *opt,
171 unsigned long *seen_tcs,
172 struct netlink_ext_ack *extack)
173 {
174 struct nlattr *tb[TCA_MQPRIO_TC_ENTRY_MAX + 1];
175 int err, tc;
176
177 err = nla_parse_nested(tb, TCA_MQPRIO_TC_ENTRY_MAX, opt,
178 mqprio_tc_entry_policy, extack);
179 if (err < 0)
180 return err;
181
182 if (NL_REQ_ATTR_CHECK(extack, opt, tb, TCA_MQPRIO_TC_ENTRY_INDEX)) {
183 NL_SET_ERR_MSG(extack, "TC entry index missing");
184 return -EINVAL;
185 }
186
187 tc = nla_get_u32(tb[TCA_MQPRIO_TC_ENTRY_INDEX]);
188 if (*seen_tcs & BIT(tc)) {
189 NL_SET_ERR_MSG_ATTR(extack, tb[TCA_MQPRIO_TC_ENTRY_INDEX],
190 "Duplicate tc entry");
191 return -EINVAL;
192 }
193
194 *seen_tcs |= BIT(tc);
195
196 if (tb[TCA_MQPRIO_TC_ENTRY_FP])
197 fp[tc] = nla_get_u32(tb[TCA_MQPRIO_TC_ENTRY_FP]);
198
199 return 0;
200 }
201
mqprio_parse_tc_entries(struct Qdisc * sch,struct nlattr * nlattr_opt,int nlattr_opt_len,struct netlink_ext_ack * extack)202 static int mqprio_parse_tc_entries(struct Qdisc *sch, struct nlattr *nlattr_opt,
203 int nlattr_opt_len,
204 struct netlink_ext_ack *extack)
205 {
206 struct mqprio_sched *priv = qdisc_priv(sch);
207 struct net_device *dev = qdisc_dev(sch);
208 bool have_preemption = false;
209 unsigned long seen_tcs = 0;
210 u32 fp[TC_QOPT_MAX_QUEUE];
211 struct nlattr *n;
212 int tc, rem;
213 int err = 0;
214
215 for (tc = 0; tc < TC_QOPT_MAX_QUEUE; tc++)
216 fp[tc] = priv->fp[tc];
217
218 nla_for_each_attr_type(n, TCA_MQPRIO_TC_ENTRY, nlattr_opt,
219 nlattr_opt_len, rem) {
220 err = mqprio_parse_tc_entry(fp, n, &seen_tcs, extack);
221 if (err)
222 goto out;
223 }
224
225 for (tc = 0; tc < TC_QOPT_MAX_QUEUE; tc++) {
226 priv->fp[tc] = fp[tc];
227 if (fp[tc] == TC_FP_PREEMPTIBLE)
228 have_preemption = true;
229 }
230
231 if (have_preemption && !ethtool_dev_mm_supported(dev)) {
232 NL_SET_ERR_MSG(extack, "Device does not support preemption");
233 return -EOPNOTSUPP;
234 }
235 out:
236 return err;
237 }
238
239 /* Parse the other netlink attributes that represent the payload of
240 * TCA_OPTIONS, which are appended right after struct tc_mqprio_qopt.
241 */
mqprio_parse_nlattr(struct Qdisc * sch,struct tc_mqprio_qopt * qopt,struct nlattr * opt,struct netlink_ext_ack * extack)242 static int mqprio_parse_nlattr(struct Qdisc *sch, struct tc_mqprio_qopt *qopt,
243 struct nlattr *opt,
244 struct netlink_ext_ack *extack)
245 {
246 struct nlattr *nlattr_opt = nla_data(opt) + NLA_ALIGN(sizeof(*qopt));
247 int nlattr_opt_len = nla_len(opt) - NLA_ALIGN(sizeof(*qopt));
248 struct mqprio_sched *priv = qdisc_priv(sch);
249 struct nlattr *tb[TCA_MQPRIO_MAX + 1] = {};
250 struct nlattr *attr;
251 int i, rem, err;
252
253 if (nlattr_opt_len >= nla_attr_size(0)) {
254 err = nla_parse_deprecated(tb, TCA_MQPRIO_MAX, nlattr_opt,
255 nlattr_opt_len, mqprio_policy,
256 NULL);
257 if (err < 0)
258 return err;
259 }
260
261 if (!qopt->hw) {
262 NL_SET_ERR_MSG(extack,
263 "mqprio TCA_OPTIONS can only contain netlink attributes in hardware mode");
264 return -EINVAL;
265 }
266
267 if (tb[TCA_MQPRIO_MODE]) {
268 priv->flags |= TC_MQPRIO_F_MODE;
269 priv->mode = nla_get_u16(tb[TCA_MQPRIO_MODE]);
270 }
271
272 if (tb[TCA_MQPRIO_SHAPER]) {
273 priv->flags |= TC_MQPRIO_F_SHAPER;
274 priv->shaper = nla_get_u16(tb[TCA_MQPRIO_SHAPER]);
275 }
276
277 if (tb[TCA_MQPRIO_MIN_RATE64]) {
278 if (priv->shaper != TC_MQPRIO_SHAPER_BW_RATE) {
279 NL_SET_ERR_MSG_ATTR(extack, tb[TCA_MQPRIO_MIN_RATE64],
280 "min_rate accepted only when shaper is in bw_rlimit mode");
281 return -EINVAL;
282 }
283 i = 0;
284 nla_for_each_nested(attr, tb[TCA_MQPRIO_MIN_RATE64],
285 rem) {
286 if (nla_type(attr) != TCA_MQPRIO_MIN_RATE64) {
287 NL_SET_ERR_MSG_ATTR(extack, attr,
288 "Attribute type expected to be TCA_MQPRIO_MIN_RATE64");
289 return -EINVAL;
290 }
291
292 if (nla_len(attr) != sizeof(u64)) {
293 NL_SET_ERR_MSG_ATTR(extack, attr,
294 "Attribute TCA_MQPRIO_MIN_RATE64 expected to have 8 bytes length");
295 return -EINVAL;
296 }
297
298 if (i >= qopt->num_tc)
299 break;
300 priv->min_rate[i] = nla_get_u64(attr);
301 i++;
302 }
303 priv->flags |= TC_MQPRIO_F_MIN_RATE;
304 }
305
306 if (tb[TCA_MQPRIO_MAX_RATE64]) {
307 if (priv->shaper != TC_MQPRIO_SHAPER_BW_RATE) {
308 NL_SET_ERR_MSG_ATTR(extack, tb[TCA_MQPRIO_MAX_RATE64],
309 "max_rate accepted only when shaper is in bw_rlimit mode");
310 return -EINVAL;
311 }
312 i = 0;
313 nla_for_each_nested(attr, tb[TCA_MQPRIO_MAX_RATE64],
314 rem) {
315 if (nla_type(attr) != TCA_MQPRIO_MAX_RATE64) {
316 NL_SET_ERR_MSG_ATTR(extack, attr,
317 "Attribute type expected to be TCA_MQPRIO_MAX_RATE64");
318 return -EINVAL;
319 }
320
321 if (nla_len(attr) != sizeof(u64)) {
322 NL_SET_ERR_MSG_ATTR(extack, attr,
323 "Attribute TCA_MQPRIO_MAX_RATE64 expected to have 8 bytes length");
324 return -EINVAL;
325 }
326
327 if (i >= qopt->num_tc)
328 break;
329 priv->max_rate[i] = nla_get_u64(attr);
330 i++;
331 }
332 priv->flags |= TC_MQPRIO_F_MAX_RATE;
333 }
334
335 if (tb[TCA_MQPRIO_TC_ENTRY]) {
336 err = mqprio_parse_tc_entries(sch, nlattr_opt, nlattr_opt_len,
337 extack);
338 if (err)
339 return err;
340 }
341
342 return 0;
343 }
344
mqprio_init(struct Qdisc * sch,struct nlattr * opt,struct netlink_ext_ack * extack)345 static int mqprio_init(struct Qdisc *sch, struct nlattr *opt,
346 struct netlink_ext_ack *extack)
347 {
348 struct net_device *dev = qdisc_dev(sch);
349 struct mqprio_sched *priv = qdisc_priv(sch);
350 struct netdev_queue *dev_queue;
351 struct Qdisc *qdisc;
352 int i, err = -EOPNOTSUPP;
353 struct tc_mqprio_qopt *qopt = NULL;
354 struct tc_mqprio_caps caps;
355 int len, tc;
356
357 BUILD_BUG_ON(TC_MAX_QUEUE != TC_QOPT_MAX_QUEUE);
358 BUILD_BUG_ON(TC_BITMASK != TC_QOPT_BITMASK);
359
360 if (sch->parent != TC_H_ROOT)
361 return -EOPNOTSUPP;
362
363 if (!netif_is_multiqueue(dev))
364 return -EOPNOTSUPP;
365
366 /* make certain can allocate enough classids to handle queues */
367 if (dev->num_tx_queues >= TC_H_MIN_PRIORITY)
368 return -ENOMEM;
369
370 if (!opt || nla_len(opt) < sizeof(*qopt))
371 return -EINVAL;
372
373 for (tc = 0; tc < TC_QOPT_MAX_QUEUE; tc++)
374 priv->fp[tc] = TC_FP_EXPRESS;
375
376 qdisc_offload_query_caps(dev, TC_SETUP_QDISC_MQPRIO,
377 &caps, sizeof(caps));
378
379 qopt = nla_data(opt);
380 if (mqprio_parse_opt(dev, qopt, &caps, extack))
381 return -EINVAL;
382
383 len = nla_len(opt) - NLA_ALIGN(sizeof(*qopt));
384 if (len > 0) {
385 err = mqprio_parse_nlattr(sch, qopt, opt, extack);
386 if (err)
387 return err;
388 }
389
390 /* pre-allocate qdisc, attachment can't fail */
391 priv->qdiscs = kzalloc_objs(priv->qdiscs[0], dev->num_tx_queues);
392 if (!priv->qdiscs)
393 return -ENOMEM;
394
395 for (i = 0; i < dev->num_tx_queues; i++) {
396 dev_queue = netdev_get_tx_queue(dev, i);
397 qdisc = qdisc_create_dflt(dev_queue,
398 get_default_qdisc_ops(dev, i),
399 TC_H_MAKE(TC_H_MAJ(sch->handle),
400 TC_H_MIN(i + 1)), extack);
401 if (!qdisc)
402 return -ENOMEM;
403
404 priv->qdiscs[i] = qdisc;
405 qdisc->flags |= TCQ_F_ONETXQUEUE | TCQ_F_NOPARENT;
406 }
407
408 /* If the mqprio options indicate that hardware should own
409 * the queue mapping then run ndo_setup_tc otherwise use the
410 * supplied and verified mapping
411 */
412 if (qopt->hw) {
413 err = mqprio_enable_offload(sch, qopt, extack);
414 if (err)
415 return err;
416 } else {
417 netdev_set_num_tc(dev, qopt->num_tc);
418 for (i = 0; i < qopt->num_tc; i++)
419 netdev_set_tc_queue(dev, i,
420 qopt->count[i], qopt->offset[i]);
421 }
422
423 /* Always use supplied priority mappings */
424 for (i = 0; i < TC_BITMASK + 1; i++)
425 netdev_set_prio_tc_map(dev, i, qopt->prio_tc_map[i]);
426
427 sch->flags |= TCQ_F_MQROOT;
428 return 0;
429 }
430
mqprio_attach(struct Qdisc * sch)431 static void mqprio_attach(struct Qdisc *sch)
432 {
433 struct net_device *dev = qdisc_dev(sch);
434 struct mqprio_sched *priv = qdisc_priv(sch);
435 struct Qdisc *qdisc, *old;
436 unsigned int ntx;
437
438 /* Attach underlying qdisc */
439 for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
440 qdisc = priv->qdiscs[ntx];
441 old = dev_graft_qdisc(qdisc->dev_queue, qdisc);
442 if (old)
443 qdisc_put(old);
444 if (ntx < dev->real_num_tx_queues)
445 qdisc_hash_add(qdisc, false);
446 }
447 kfree(priv->qdiscs);
448 priv->qdiscs = NULL;
449 }
450
mqprio_queue_get(struct Qdisc * sch,unsigned long cl)451 static struct netdev_queue *mqprio_queue_get(struct Qdisc *sch,
452 unsigned long cl)
453 {
454 struct net_device *dev = qdisc_dev(sch);
455 unsigned long ntx = cl - 1;
456
457 if (ntx >= dev->num_tx_queues)
458 return NULL;
459 return netdev_get_tx_queue(dev, ntx);
460 }
461
mqprio_graft(struct Qdisc * sch,unsigned long cl,struct Qdisc * new,struct Qdisc ** old,struct netlink_ext_ack * extack)462 static int mqprio_graft(struct Qdisc *sch, unsigned long cl, struct Qdisc *new,
463 struct Qdisc **old, struct netlink_ext_ack *extack)
464 {
465 struct net_device *dev = qdisc_dev(sch);
466 struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
467
468 if (!dev_queue)
469 return -EINVAL;
470
471 if (dev->flags & IFF_UP)
472 dev_deactivate(dev);
473
474 *old = dev_graft_qdisc(dev_queue, new);
475
476 if (new)
477 new->flags |= TCQ_F_ONETXQUEUE | TCQ_F_NOPARENT;
478
479 if (dev->flags & IFF_UP)
480 dev_activate(dev);
481
482 return 0;
483 }
484
dump_rates(struct mqprio_sched * priv,struct tc_mqprio_qopt * opt,struct sk_buff * skb)485 static int dump_rates(struct mqprio_sched *priv,
486 struct tc_mqprio_qopt *opt, struct sk_buff *skb)
487 {
488 struct nlattr *nest;
489 int i;
490
491 if (priv->flags & TC_MQPRIO_F_MIN_RATE) {
492 nest = nla_nest_start_noflag(skb, TCA_MQPRIO_MIN_RATE64);
493 if (!nest)
494 goto nla_put_failure;
495
496 for (i = 0; i < opt->num_tc; i++) {
497 if (nla_put(skb, TCA_MQPRIO_MIN_RATE64,
498 sizeof(priv->min_rate[i]),
499 &priv->min_rate[i]))
500 goto nla_put_failure;
501 }
502 nla_nest_end(skb, nest);
503 }
504
505 if (priv->flags & TC_MQPRIO_F_MAX_RATE) {
506 nest = nla_nest_start_noflag(skb, TCA_MQPRIO_MAX_RATE64);
507 if (!nest)
508 goto nla_put_failure;
509
510 for (i = 0; i < opt->num_tc; i++) {
511 if (nla_put(skb, TCA_MQPRIO_MAX_RATE64,
512 sizeof(priv->max_rate[i]),
513 &priv->max_rate[i]))
514 goto nla_put_failure;
515 }
516 nla_nest_end(skb, nest);
517 }
518 return 0;
519
520 nla_put_failure:
521 nla_nest_cancel(skb, nest);
522 return -1;
523 }
524
mqprio_dump_tc_entries(struct mqprio_sched * priv,struct sk_buff * skb)525 static int mqprio_dump_tc_entries(struct mqprio_sched *priv,
526 struct sk_buff *skb)
527 {
528 struct nlattr *n;
529 int tc;
530
531 for (tc = 0; tc < TC_QOPT_MAX_QUEUE; tc++) {
532 n = nla_nest_start(skb, TCA_MQPRIO_TC_ENTRY);
533 if (!n)
534 return -EMSGSIZE;
535
536 if (nla_put_u32(skb, TCA_MQPRIO_TC_ENTRY_INDEX, tc))
537 goto nla_put_failure;
538
539 if (nla_put_u32(skb, TCA_MQPRIO_TC_ENTRY_FP, priv->fp[tc]))
540 goto nla_put_failure;
541
542 nla_nest_end(skb, n);
543 }
544
545 return 0;
546
547 nla_put_failure:
548 nla_nest_cancel(skb, n);
549 return -EMSGSIZE;
550 }
551
mqprio_dump(struct Qdisc * sch,struct sk_buff * skb)552 static int mqprio_dump(struct Qdisc *sch, struct sk_buff *skb)
553 {
554 struct net_device *dev = qdisc_dev(sch);
555 struct mqprio_sched *priv = qdisc_priv(sch);
556 struct nlattr *nla = (struct nlattr *)skb_tail_pointer(skb);
557 struct tc_mqprio_qopt opt = { 0 };
558 struct Qdisc *qdisc;
559 unsigned int ntx;
560
561 sch->q.qlen = 0;
562 gnet_stats_basic_sync_init(&sch->bstats);
563 memset(&sch->qstats, 0, sizeof(sch->qstats));
564
565 /* MQ supports lockless qdiscs. However, statistics accounting needs
566 * to account for all, none, or a mix of locked and unlocked child
567 * qdiscs. Percpu stats are added to counters in-band and locking
568 * qdisc totals are added at end.
569 */
570 for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
571 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, ntx)->qdisc_sleeping);
572 spin_lock_bh(qdisc_lock(qdisc));
573
574 gnet_stats_add_basic(&sch->bstats, qdisc->cpu_bstats,
575 &qdisc->bstats, false);
576 gnet_stats_add_queue(&sch->qstats, qdisc->cpu_qstats,
577 &qdisc->qstats);
578 sch->q.qlen += qdisc_qlen(qdisc);
579
580 spin_unlock_bh(qdisc_lock(qdisc));
581 }
582
583 mqprio_qopt_reconstruct(dev, &opt);
584 opt.hw = priv->hw_offload;
585
586 if (nla_put(skb, TCA_OPTIONS, sizeof(opt), &opt))
587 goto nla_put_failure;
588
589 if ((priv->flags & TC_MQPRIO_F_MODE) &&
590 nla_put_u16(skb, TCA_MQPRIO_MODE, priv->mode))
591 goto nla_put_failure;
592
593 if ((priv->flags & TC_MQPRIO_F_SHAPER) &&
594 nla_put_u16(skb, TCA_MQPRIO_SHAPER, priv->shaper))
595 goto nla_put_failure;
596
597 if ((priv->flags & TC_MQPRIO_F_MIN_RATE ||
598 priv->flags & TC_MQPRIO_F_MAX_RATE) &&
599 (dump_rates(priv, &opt, skb) != 0))
600 goto nla_put_failure;
601
602 if (mqprio_dump_tc_entries(priv, skb))
603 goto nla_put_failure;
604
605 return nla_nest_end(skb, nla);
606 nla_put_failure:
607 nlmsg_trim(skb, nla);
608 return -1;
609 }
610
mqprio_leaf(struct Qdisc * sch,unsigned long cl)611 static struct Qdisc *mqprio_leaf(struct Qdisc *sch, unsigned long cl)
612 {
613 struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
614
615 if (!dev_queue)
616 return NULL;
617
618 return rtnl_dereference(dev_queue->qdisc_sleeping);
619 }
620
mqprio_find(struct Qdisc * sch,u32 classid)621 static unsigned long mqprio_find(struct Qdisc *sch, u32 classid)
622 {
623 struct net_device *dev = qdisc_dev(sch);
624 unsigned int ntx = TC_H_MIN(classid);
625
626 /* There are essentially two regions here that have valid classid
627 * values. The first region will have a classid value of 1 through
628 * num_tx_queues. All of these are backed by actual Qdiscs.
629 */
630 if (ntx < TC_H_MIN_PRIORITY)
631 return (ntx <= dev->num_tx_queues) ? ntx : 0;
632
633 /* The second region represents the hardware traffic classes. These
634 * are represented by classid values of TC_H_MIN_PRIORITY through
635 * TC_H_MIN_PRIORITY + netdev_get_num_tc - 1
636 */
637 return ((ntx - TC_H_MIN_PRIORITY) < netdev_get_num_tc(dev)) ? ntx : 0;
638 }
639
mqprio_dump_class(struct Qdisc * sch,unsigned long cl,struct sk_buff * skb,struct tcmsg * tcm)640 static int mqprio_dump_class(struct Qdisc *sch, unsigned long cl,
641 struct sk_buff *skb, struct tcmsg *tcm)
642 {
643 if (cl < TC_H_MIN_PRIORITY) {
644 struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
645 struct net_device *dev = qdisc_dev(sch);
646 int tc = netdev_txq_to_tc(dev, cl - 1);
647
648 tcm->tcm_parent = (tc < 0) ? 0 :
649 TC_H_MAKE(TC_H_MAJ(sch->handle),
650 TC_H_MIN(tc + TC_H_MIN_PRIORITY));
651 tcm->tcm_info = rtnl_dereference(dev_queue->qdisc_sleeping)->handle;
652 } else {
653 tcm->tcm_parent = TC_H_ROOT;
654 tcm->tcm_info = 0;
655 }
656 tcm->tcm_handle |= TC_H_MIN(cl);
657 return 0;
658 }
659
mqprio_dump_class_stats(struct Qdisc * sch,unsigned long cl,struct gnet_dump * d)660 static int mqprio_dump_class_stats(struct Qdisc *sch, unsigned long cl,
661 struct gnet_dump *d)
662 __releases(d->lock)
663 __acquires(d->lock)
664 {
665 if (cl >= TC_H_MIN_PRIORITY) {
666 int i;
667 __u32 qlen;
668 struct gnet_stats_queue qstats = {0};
669 struct gnet_stats_basic_sync bstats;
670 struct net_device *dev = qdisc_dev(sch);
671 struct netdev_tc_txq tc = dev->tc_to_txq[cl & TC_BITMASK];
672
673 gnet_stats_basic_sync_init(&bstats);
674 /* Drop lock here it will be reclaimed before touching
675 * statistics this is required because the d->lock we
676 * hold here is the look on dev_queue->qdisc_sleeping
677 * also acquired below.
678 */
679 if (d->lock)
680 spin_unlock_bh(d->lock);
681
682 for (i = tc.offset; i < tc.offset + tc.count; i++) {
683 struct netdev_queue *q = netdev_get_tx_queue(dev, i);
684 struct Qdisc *qdisc = rtnl_dereference(q->qdisc);
685
686 spin_lock_bh(qdisc_lock(qdisc));
687
688 gnet_stats_add_basic(&bstats, qdisc->cpu_bstats,
689 &qdisc->bstats, false);
690 gnet_stats_add_queue(&qstats, qdisc->cpu_qstats,
691 &qdisc->qstats);
692 sch->q.qlen += qdisc_qlen(qdisc);
693
694 spin_unlock_bh(qdisc_lock(qdisc));
695 }
696 qlen = qdisc_qlen(sch) + qstats.qlen;
697
698 /* Reclaim root sleeping lock before completing stats */
699 if (d->lock)
700 spin_lock_bh(d->lock);
701 if (gnet_stats_copy_basic(d, NULL, &bstats, false) < 0 ||
702 gnet_stats_copy_queue(d, NULL, &qstats, qlen) < 0)
703 return -1;
704 } else {
705 struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
706
707 sch = rtnl_dereference(dev_queue->qdisc_sleeping);
708 if (gnet_stats_copy_basic(d, sch->cpu_bstats,
709 &sch->bstats, true) < 0 ||
710 qdisc_qstats_copy(d, sch) < 0)
711 return -1;
712 }
713 return 0;
714 }
715
mqprio_walk(struct Qdisc * sch,struct qdisc_walker * arg)716 static void mqprio_walk(struct Qdisc *sch, struct qdisc_walker *arg)
717 {
718 struct net_device *dev = qdisc_dev(sch);
719 unsigned long ntx;
720
721 if (arg->stop)
722 return;
723
724 /* Walk hierarchy with a virtual class per tc */
725 arg->count = arg->skip;
726 for (ntx = arg->skip; ntx < netdev_get_num_tc(dev); ntx++) {
727 if (!tc_qdisc_stats_dump(sch, ntx + TC_H_MIN_PRIORITY, arg))
728 return;
729 }
730
731 /* Pad the values and skip over unused traffic classes */
732 if (ntx < TC_MAX_QUEUE) {
733 arg->count = TC_MAX_QUEUE;
734 ntx = TC_MAX_QUEUE;
735 }
736
737 /* Reset offset, sort out remaining per-queue qdiscs */
738 for (ntx -= TC_MAX_QUEUE; ntx < dev->num_tx_queues; ntx++) {
739 if (arg->fn(sch, ntx + 1, arg) < 0) {
740 arg->stop = 1;
741 return;
742 }
743 arg->count++;
744 }
745 }
746
mqprio_select_queue(struct Qdisc * sch,struct tcmsg * tcm)747 static struct netdev_queue *mqprio_select_queue(struct Qdisc *sch,
748 struct tcmsg *tcm)
749 {
750 return mqprio_queue_get(sch, TC_H_MIN(tcm->tcm_parent));
751 }
752
753 static const struct Qdisc_class_ops mqprio_class_ops = {
754 .graft = mqprio_graft,
755 .leaf = mqprio_leaf,
756 .find = mqprio_find,
757 .walk = mqprio_walk,
758 .dump = mqprio_dump_class,
759 .dump_stats = mqprio_dump_class_stats,
760 .select_queue = mqprio_select_queue,
761 };
762
763 static struct Qdisc_ops mqprio_qdisc_ops __read_mostly = {
764 .cl_ops = &mqprio_class_ops,
765 .id = "mqprio",
766 .priv_size = sizeof(struct mqprio_sched),
767 .init = mqprio_init,
768 .destroy = mqprio_destroy,
769 .attach = mqprio_attach,
770 .change_real_num_tx = mq_change_real_num_tx,
771 .dump = mqprio_dump,
772 .owner = THIS_MODULE,
773 };
774 MODULE_ALIAS_NET_SCH("mqprio");
775
mqprio_module_init(void)776 static int __init mqprio_module_init(void)
777 {
778 return register_qdisc(&mqprio_qdisc_ops);
779 }
780
mqprio_module_exit(void)781 static void __exit mqprio_module_exit(void)
782 {
783 unregister_qdisc(&mqprio_qdisc_ops);
784 }
785
786 module_init(mqprio_module_init);
787 module_exit(mqprio_module_exit);
788
789 MODULE_LICENSE("GPL");
790 MODULE_DESCRIPTION("Classful multiqueue prio qdisc");
791