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8#include <linux/types.h>
9#include <linux/slab.h>
10#include <linux/kernel.h>
11#include <linux/string.h>
12#include <linux/errno.h>
13#include <linux/skbuff.h>
14#include <linux/module.h>
15#include <net/netlink.h>
16#include <net/pkt_sched.h>
17#include <net/sch_generic.h>
18#include <net/pkt_cls.h>
19
20struct mqprio_sched {
21 struct Qdisc **qdiscs;
22 u16 mode;
23 u16 shaper;
24 int hw_offload;
25 u32 flags;
26 u64 min_rate[TC_QOPT_MAX_QUEUE];
27 u64 max_rate[TC_QOPT_MAX_QUEUE];
28};
29
30static void mqprio_destroy(struct Qdisc *sch)
31{
32 struct net_device *dev = qdisc_dev(sch);
33 struct mqprio_sched *priv = qdisc_priv(sch);
34 unsigned int ntx;
35
36 if (priv->qdiscs) {
37 for (ntx = 0;
38 ntx < dev->num_tx_queues && priv->qdiscs[ntx];
39 ntx++)
40 qdisc_put(priv->qdiscs[ntx]);
41 kfree(priv->qdiscs);
42 }
43
44 if (priv->hw_offload && dev->netdev_ops->ndo_setup_tc) {
45 struct tc_mqprio_qopt_offload mqprio = { { 0 } };
46
47 switch (priv->mode) {
48 case TC_MQPRIO_MODE_DCB:
49 case TC_MQPRIO_MODE_CHANNEL:
50 dev->netdev_ops->ndo_setup_tc(dev,
51 TC_SETUP_QDISC_MQPRIO,
52 &mqprio);
53 break;
54 default:
55 return;
56 }
57 } else {
58 netdev_set_num_tc(dev, 0);
59 }
60}
61
62static int mqprio_parse_opt(struct net_device *dev, struct tc_mqprio_qopt *qopt)
63{
64 int i, j;
65
66
67 if (qopt->num_tc > TC_MAX_QUEUE)
68 return -EINVAL;
69
70
71 for (i = 0; i < TC_BITMASK + 1; i++) {
72 if (qopt->prio_tc_map[i] >= qopt->num_tc)
73 return -EINVAL;
74 }
75
76
77
78
79
80 if (qopt->hw > TC_MQPRIO_HW_OFFLOAD_MAX)
81 qopt->hw = TC_MQPRIO_HW_OFFLOAD_MAX;
82
83
84
85
86
87
88 if (qopt->hw)
89 return dev->netdev_ops->ndo_setup_tc ? 0 : -EINVAL;
90
91 for (i = 0; i < qopt->num_tc; i++) {
92 unsigned int last = qopt->offset[i] + qopt->count[i];
93
94
95
96
97 if (qopt->offset[i] >= dev->real_num_tx_queues ||
98 !qopt->count[i] ||
99 last > dev->real_num_tx_queues)
100 return -EINVAL;
101
102
103 for (j = i + 1; j < qopt->num_tc; j++) {
104 if (last > qopt->offset[j])
105 return -EINVAL;
106 }
107 }
108
109 return 0;
110}
111
112static const struct nla_policy mqprio_policy[TCA_MQPRIO_MAX + 1] = {
113 [TCA_MQPRIO_MODE] = { .len = sizeof(u16) },
114 [TCA_MQPRIO_SHAPER] = { .len = sizeof(u16) },
115 [TCA_MQPRIO_MIN_RATE64] = { .type = NLA_NESTED },
116 [TCA_MQPRIO_MAX_RATE64] = { .type = NLA_NESTED },
117};
118
119static int parse_attr(struct nlattr *tb[], int maxtype, struct nlattr *nla,
120 const struct nla_policy *policy, int len)
121{
122 int nested_len = nla_len(nla) - NLA_ALIGN(len);
123
124 if (nested_len >= nla_attr_size(0))
125 return nla_parse_deprecated(tb, maxtype,
126 nla_data(nla) + NLA_ALIGN(len),
127 nested_len, policy, NULL);
128
129 memset(tb, 0, sizeof(struct nlattr *) * (maxtype + 1));
130 return 0;
131}
132
133static int mqprio_init(struct Qdisc *sch, struct nlattr *opt,
134 struct netlink_ext_ack *extack)
135{
136 struct net_device *dev = qdisc_dev(sch);
137 struct mqprio_sched *priv = qdisc_priv(sch);
138 struct netdev_queue *dev_queue;
139 struct Qdisc *qdisc;
140 int i, err = -EOPNOTSUPP;
141 struct tc_mqprio_qopt *qopt = NULL;
142 struct nlattr *tb[TCA_MQPRIO_MAX + 1];
143 struct nlattr *attr;
144 int rem;
145 int len;
146
147 BUILD_BUG_ON(TC_MAX_QUEUE != TC_QOPT_MAX_QUEUE);
148 BUILD_BUG_ON(TC_BITMASK != TC_QOPT_BITMASK);
149
150 if (sch->parent != TC_H_ROOT)
151 return -EOPNOTSUPP;
152
153 if (!netif_is_multiqueue(dev))
154 return -EOPNOTSUPP;
155
156
157 if (dev->num_tx_queues >= TC_H_MIN_PRIORITY)
158 return -ENOMEM;
159
160 if (!opt || nla_len(opt) < sizeof(*qopt))
161 return -EINVAL;
162
163 qopt = nla_data(opt);
164 if (mqprio_parse_opt(dev, qopt))
165 return -EINVAL;
166
167 len = nla_len(opt) - NLA_ALIGN(sizeof(*qopt));
168 if (len > 0) {
169 err = parse_attr(tb, TCA_MQPRIO_MAX, opt, mqprio_policy,
170 sizeof(*qopt));
171 if (err < 0)
172 return err;
173
174 if (!qopt->hw)
175 return -EINVAL;
176
177 if (tb[TCA_MQPRIO_MODE]) {
178 priv->flags |= TC_MQPRIO_F_MODE;
179 priv->mode = *(u16 *)nla_data(tb[TCA_MQPRIO_MODE]);
180 }
181
182 if (tb[TCA_MQPRIO_SHAPER]) {
183 priv->flags |= TC_MQPRIO_F_SHAPER;
184 priv->shaper = *(u16 *)nla_data(tb[TCA_MQPRIO_SHAPER]);
185 }
186
187 if (tb[TCA_MQPRIO_MIN_RATE64]) {
188 if (priv->shaper != TC_MQPRIO_SHAPER_BW_RATE)
189 return -EINVAL;
190 i = 0;
191 nla_for_each_nested(attr, tb[TCA_MQPRIO_MIN_RATE64],
192 rem) {
193 if (nla_type(attr) != TCA_MQPRIO_MIN_RATE64)
194 return -EINVAL;
195 if (i >= qopt->num_tc)
196 break;
197 priv->min_rate[i] = *(u64 *)nla_data(attr);
198 i++;
199 }
200 priv->flags |= TC_MQPRIO_F_MIN_RATE;
201 }
202
203 if (tb[TCA_MQPRIO_MAX_RATE64]) {
204 if (priv->shaper != TC_MQPRIO_SHAPER_BW_RATE)
205 return -EINVAL;
206 i = 0;
207 nla_for_each_nested(attr, tb[TCA_MQPRIO_MAX_RATE64],
208 rem) {
209 if (nla_type(attr) != TCA_MQPRIO_MAX_RATE64)
210 return -EINVAL;
211 if (i >= qopt->num_tc)
212 break;
213 priv->max_rate[i] = *(u64 *)nla_data(attr);
214 i++;
215 }
216 priv->flags |= TC_MQPRIO_F_MAX_RATE;
217 }
218 }
219
220
221 priv->qdiscs = kcalloc(dev->num_tx_queues, sizeof(priv->qdiscs[0]),
222 GFP_KERNEL);
223 if (!priv->qdiscs)
224 return -ENOMEM;
225
226 for (i = 0; i < dev->num_tx_queues; i++) {
227 dev_queue = netdev_get_tx_queue(dev, i);
228 qdisc = qdisc_create_dflt(dev_queue,
229 get_default_qdisc_ops(dev, i),
230 TC_H_MAKE(TC_H_MAJ(sch->handle),
231 TC_H_MIN(i + 1)), extack);
232 if (!qdisc)
233 return -ENOMEM;
234
235 priv->qdiscs[i] = qdisc;
236 qdisc->flags |= TCQ_F_ONETXQUEUE | TCQ_F_NOPARENT;
237 }
238
239
240
241
242
243 if (qopt->hw) {
244 struct tc_mqprio_qopt_offload mqprio = {.qopt = *qopt};
245
246 switch (priv->mode) {
247 case TC_MQPRIO_MODE_DCB:
248 if (priv->shaper != TC_MQPRIO_SHAPER_DCB)
249 return -EINVAL;
250 break;
251 case TC_MQPRIO_MODE_CHANNEL:
252 mqprio.flags = priv->flags;
253 if (priv->flags & TC_MQPRIO_F_MODE)
254 mqprio.mode = priv->mode;
255 if (priv->flags & TC_MQPRIO_F_SHAPER)
256 mqprio.shaper = priv->shaper;
257 if (priv->flags & TC_MQPRIO_F_MIN_RATE)
258 for (i = 0; i < mqprio.qopt.num_tc; i++)
259 mqprio.min_rate[i] = priv->min_rate[i];
260 if (priv->flags & TC_MQPRIO_F_MAX_RATE)
261 for (i = 0; i < mqprio.qopt.num_tc; i++)
262 mqprio.max_rate[i] = priv->max_rate[i];
263 break;
264 default:
265 return -EINVAL;
266 }
267 err = dev->netdev_ops->ndo_setup_tc(dev,
268 TC_SETUP_QDISC_MQPRIO,
269 &mqprio);
270 if (err)
271 return err;
272
273 priv->hw_offload = mqprio.qopt.hw;
274 } else {
275 netdev_set_num_tc(dev, qopt->num_tc);
276 for (i = 0; i < qopt->num_tc; i++)
277 netdev_set_tc_queue(dev, i,
278 qopt->count[i], qopt->offset[i]);
279 }
280
281
282 for (i = 0; i < TC_BITMASK + 1; i++)
283 netdev_set_prio_tc_map(dev, i, qopt->prio_tc_map[i]);
284
285 sch->flags |= TCQ_F_MQROOT;
286 return 0;
287}
288
289static void mqprio_attach(struct Qdisc *sch)
290{
291 struct net_device *dev = qdisc_dev(sch);
292 struct mqprio_sched *priv = qdisc_priv(sch);
293 struct Qdisc *qdisc, *old;
294 unsigned int ntx;
295
296
297 for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
298 qdisc = priv->qdiscs[ntx];
299 old = dev_graft_qdisc(qdisc->dev_queue, qdisc);
300 if (old)
301 qdisc_put(old);
302 if (ntx < dev->real_num_tx_queues)
303 qdisc_hash_add(qdisc, false);
304 }
305 kfree(priv->qdiscs);
306 priv->qdiscs = NULL;
307}
308
309static struct netdev_queue *mqprio_queue_get(struct Qdisc *sch,
310 unsigned long cl)
311{
312 struct net_device *dev = qdisc_dev(sch);
313 unsigned long ntx = cl - 1;
314
315 if (ntx >= dev->num_tx_queues)
316 return NULL;
317 return netdev_get_tx_queue(dev, ntx);
318}
319
320static int mqprio_graft(struct Qdisc *sch, unsigned long cl, struct Qdisc *new,
321 struct Qdisc **old, struct netlink_ext_ack *extack)
322{
323 struct net_device *dev = qdisc_dev(sch);
324 struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
325
326 if (!dev_queue)
327 return -EINVAL;
328
329 if (dev->flags & IFF_UP)
330 dev_deactivate(dev);
331
332 *old = dev_graft_qdisc(dev_queue, new);
333
334 if (new)
335 new->flags |= TCQ_F_ONETXQUEUE | TCQ_F_NOPARENT;
336
337 if (dev->flags & IFF_UP)
338 dev_activate(dev);
339
340 return 0;
341}
342
343static int dump_rates(struct mqprio_sched *priv,
344 struct tc_mqprio_qopt *opt, struct sk_buff *skb)
345{
346 struct nlattr *nest;
347 int i;
348
349 if (priv->flags & TC_MQPRIO_F_MIN_RATE) {
350 nest = nla_nest_start_noflag(skb, TCA_MQPRIO_MIN_RATE64);
351 if (!nest)
352 goto nla_put_failure;
353
354 for (i = 0; i < opt->num_tc; i++) {
355 if (nla_put(skb, TCA_MQPRIO_MIN_RATE64,
356 sizeof(priv->min_rate[i]),
357 &priv->min_rate[i]))
358 goto nla_put_failure;
359 }
360 nla_nest_end(skb, nest);
361 }
362
363 if (priv->flags & TC_MQPRIO_F_MAX_RATE) {
364 nest = nla_nest_start_noflag(skb, TCA_MQPRIO_MAX_RATE64);
365 if (!nest)
366 goto nla_put_failure;
367
368 for (i = 0; i < opt->num_tc; i++) {
369 if (nla_put(skb, TCA_MQPRIO_MAX_RATE64,
370 sizeof(priv->max_rate[i]),
371 &priv->max_rate[i]))
372 goto nla_put_failure;
373 }
374 nla_nest_end(skb, nest);
375 }
376 return 0;
377
378nla_put_failure:
379 nla_nest_cancel(skb, nest);
380 return -1;
381}
382
383static int mqprio_dump(struct Qdisc *sch, struct sk_buff *skb)
384{
385 struct net_device *dev = qdisc_dev(sch);
386 struct mqprio_sched *priv = qdisc_priv(sch);
387 struct nlattr *nla = (struct nlattr *)skb_tail_pointer(skb);
388 struct tc_mqprio_qopt opt = { 0 };
389 struct Qdisc *qdisc;
390 unsigned int ntx, tc;
391
392 sch->q.qlen = 0;
393 memset(&sch->bstats, 0, sizeof(sch->bstats));
394 memset(&sch->qstats, 0, sizeof(sch->qstats));
395
396
397
398
399
400
401 for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
402 qdisc = netdev_get_tx_queue(dev, ntx)->qdisc_sleeping;
403 spin_lock_bh(qdisc_lock(qdisc));
404
405 if (qdisc_is_percpu_stats(qdisc)) {
406 __u32 qlen = qdisc_qlen_sum(qdisc);
407
408 __gnet_stats_copy_basic(NULL, &sch->bstats,
409 qdisc->cpu_bstats,
410 &qdisc->bstats);
411 __gnet_stats_copy_queue(&sch->qstats,
412 qdisc->cpu_qstats,
413 &qdisc->qstats, qlen);
414 sch->q.qlen += qlen;
415 } else {
416 sch->q.qlen += qdisc->q.qlen;
417 sch->bstats.bytes += qdisc->bstats.bytes;
418 sch->bstats.packets += qdisc->bstats.packets;
419 sch->qstats.backlog += qdisc->qstats.backlog;
420 sch->qstats.drops += qdisc->qstats.drops;
421 sch->qstats.requeues += qdisc->qstats.requeues;
422 sch->qstats.overlimits += qdisc->qstats.overlimits;
423 }
424
425 spin_unlock_bh(qdisc_lock(qdisc));
426 }
427
428 opt.num_tc = netdev_get_num_tc(dev);
429 memcpy(opt.prio_tc_map, dev->prio_tc_map, sizeof(opt.prio_tc_map));
430 opt.hw = priv->hw_offload;
431
432 for (tc = 0; tc < netdev_get_num_tc(dev); tc++) {
433 opt.count[tc] = dev->tc_to_txq[tc].count;
434 opt.offset[tc] = dev->tc_to_txq[tc].offset;
435 }
436
437 if (nla_put(skb, TCA_OPTIONS, sizeof(opt), &opt))
438 goto nla_put_failure;
439
440 if ((priv->flags & TC_MQPRIO_F_MODE) &&
441 nla_put_u16(skb, TCA_MQPRIO_MODE, priv->mode))
442 goto nla_put_failure;
443
444 if ((priv->flags & TC_MQPRIO_F_SHAPER) &&
445 nla_put_u16(skb, TCA_MQPRIO_SHAPER, priv->shaper))
446 goto nla_put_failure;
447
448 if ((priv->flags & TC_MQPRIO_F_MIN_RATE ||
449 priv->flags & TC_MQPRIO_F_MAX_RATE) &&
450 (dump_rates(priv, &opt, skb) != 0))
451 goto nla_put_failure;
452
453 return nla_nest_end(skb, nla);
454nla_put_failure:
455 nlmsg_trim(skb, nla);
456 return -1;
457}
458
459static struct Qdisc *mqprio_leaf(struct Qdisc *sch, unsigned long cl)
460{
461 struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
462
463 if (!dev_queue)
464 return NULL;
465
466 return dev_queue->qdisc_sleeping;
467}
468
469static unsigned long mqprio_find(struct Qdisc *sch, u32 classid)
470{
471 struct net_device *dev = qdisc_dev(sch);
472 unsigned int ntx = TC_H_MIN(classid);
473
474
475
476
477
478 if (ntx < TC_H_MIN_PRIORITY)
479 return (ntx <= dev->num_tx_queues) ? ntx : 0;
480
481
482
483
484
485 return ((ntx - TC_H_MIN_PRIORITY) < netdev_get_num_tc(dev)) ? ntx : 0;
486}
487
488static int mqprio_dump_class(struct Qdisc *sch, unsigned long cl,
489 struct sk_buff *skb, struct tcmsg *tcm)
490{
491 if (cl < TC_H_MIN_PRIORITY) {
492 struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
493 struct net_device *dev = qdisc_dev(sch);
494 int tc = netdev_txq_to_tc(dev, cl - 1);
495
496 tcm->tcm_parent = (tc < 0) ? 0 :
497 TC_H_MAKE(TC_H_MAJ(sch->handle),
498 TC_H_MIN(tc + TC_H_MIN_PRIORITY));
499 tcm->tcm_info = dev_queue->qdisc_sleeping->handle;
500 } else {
501 tcm->tcm_parent = TC_H_ROOT;
502 tcm->tcm_info = 0;
503 }
504 tcm->tcm_handle |= TC_H_MIN(cl);
505 return 0;
506}
507
508static int mqprio_dump_class_stats(struct Qdisc *sch, unsigned long cl,
509 struct gnet_dump *d)
510 __releases(d->lock)
511 __acquires(d->lock)
512{
513 if (cl >= TC_H_MIN_PRIORITY) {
514 int i;
515 __u32 qlen = 0;
516 struct gnet_stats_queue qstats = {0};
517 struct gnet_stats_basic_packed bstats = {0};
518 struct net_device *dev = qdisc_dev(sch);
519 struct netdev_tc_txq tc = dev->tc_to_txq[cl & TC_BITMASK];
520
521
522
523
524
525
526 if (d->lock)
527 spin_unlock_bh(d->lock);
528
529 for (i = tc.offset; i < tc.offset + tc.count; i++) {
530 struct netdev_queue *q = netdev_get_tx_queue(dev, i);
531 struct Qdisc *qdisc = rtnl_dereference(q->qdisc);
532 struct gnet_stats_basic_cpu __percpu *cpu_bstats = NULL;
533 struct gnet_stats_queue __percpu *cpu_qstats = NULL;
534
535 spin_lock_bh(qdisc_lock(qdisc));
536 if (qdisc_is_percpu_stats(qdisc)) {
537 cpu_bstats = qdisc->cpu_bstats;
538 cpu_qstats = qdisc->cpu_qstats;
539 }
540
541 qlen = qdisc_qlen_sum(qdisc);
542 __gnet_stats_copy_basic(NULL, &sch->bstats,
543 cpu_bstats, &qdisc->bstats);
544 __gnet_stats_copy_queue(&sch->qstats,
545 cpu_qstats,
546 &qdisc->qstats,
547 qlen);
548 spin_unlock_bh(qdisc_lock(qdisc));
549 }
550
551
552 if (d->lock)
553 spin_lock_bh(d->lock);
554 if (gnet_stats_copy_basic(NULL, d, NULL, &bstats) < 0 ||
555 gnet_stats_copy_queue(d, NULL, &qstats, qlen) < 0)
556 return -1;
557 } else {
558 struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
559
560 sch = dev_queue->qdisc_sleeping;
561 if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch), d,
562 sch->cpu_bstats, &sch->bstats) < 0 ||
563 qdisc_qstats_copy(d, sch) < 0)
564 return -1;
565 }
566 return 0;
567}
568
569static void mqprio_walk(struct Qdisc *sch, struct qdisc_walker *arg)
570{
571 struct net_device *dev = qdisc_dev(sch);
572 unsigned long ntx;
573
574 if (arg->stop)
575 return;
576
577
578 arg->count = arg->skip;
579 for (ntx = arg->skip; ntx < netdev_get_num_tc(dev); ntx++) {
580 if (arg->fn(sch, ntx + TC_H_MIN_PRIORITY, arg) < 0) {
581 arg->stop = 1;
582 return;
583 }
584 arg->count++;
585 }
586
587
588 if (ntx < TC_MAX_QUEUE) {
589 arg->count = TC_MAX_QUEUE;
590 ntx = TC_MAX_QUEUE;
591 }
592
593
594 for (ntx -= TC_MAX_QUEUE; ntx < dev->num_tx_queues; ntx++) {
595 if (arg->fn(sch, ntx + 1, arg) < 0) {
596 arg->stop = 1;
597 return;
598 }
599 arg->count++;
600 }
601}
602
603static struct netdev_queue *mqprio_select_queue(struct Qdisc *sch,
604 struct tcmsg *tcm)
605{
606 return mqprio_queue_get(sch, TC_H_MIN(tcm->tcm_parent));
607}
608
609static const struct Qdisc_class_ops mqprio_class_ops = {
610 .graft = mqprio_graft,
611 .leaf = mqprio_leaf,
612 .find = mqprio_find,
613 .walk = mqprio_walk,
614 .dump = mqprio_dump_class,
615 .dump_stats = mqprio_dump_class_stats,
616 .select_queue = mqprio_select_queue,
617};
618
619static struct Qdisc_ops mqprio_qdisc_ops __read_mostly = {
620 .cl_ops = &mqprio_class_ops,
621 .id = "mqprio",
622 .priv_size = sizeof(struct mqprio_sched),
623 .init = mqprio_init,
624 .destroy = mqprio_destroy,
625 .attach = mqprio_attach,
626 .dump = mqprio_dump,
627 .owner = THIS_MODULE,
628};
629
630static int __init mqprio_module_init(void)
631{
632 return register_qdisc(&mqprio_qdisc_ops);
633}
634
635static void __exit mqprio_module_exit(void)
636{
637 unregister_qdisc(&mqprio_qdisc_ops);
638}
639
640module_init(mqprio_module_init);
641module_exit(mqprio_module_exit);
642
643MODULE_LICENSE("GPL");
644
