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11#include <linux/types.h>
12#include <linux/slab.h>
13#include <linux/kernel.h>
14#include <linux/string.h>
15#include <linux/errno.h>
16#include <linux/skbuff.h>
17#include <linux/module.h>
18#include <net/netlink.h>
19#include <net/pkt_sched.h>
20#include <net/sch_generic.h>
21#include <net/pkt_cls.h>
22
23struct 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};
32
33static void mqprio_destroy(struct Qdisc *sch)
34{
35 struct net_device *dev = qdisc_dev(sch);
36 struct mqprio_sched *priv = qdisc_priv(sch);
37 unsigned int ntx;
38
39 if (priv->qdiscs) {
40 for (ntx = 0;
41 ntx < dev->num_tx_queues && priv->qdiscs[ntx];
42 ntx++)
43 qdisc_destroy(priv->qdiscs[ntx]);
44 kfree(priv->qdiscs);
45 }
46
47 if (priv->hw_offload && dev->netdev_ops->ndo_setup_tc) {
48 struct tc_mqprio_qopt_offload mqprio = { { 0 } };
49
50 switch (priv->mode) {
51 case TC_MQPRIO_MODE_DCB:
52 case TC_MQPRIO_MODE_CHANNEL:
53 dev->netdev_ops->ndo_setup_tc(dev,
54 TC_SETUP_QDISC_MQPRIO,
55 &mqprio);
56 break;
57 default:
58 return;
59 }
60 } else {
61 netdev_set_num_tc(dev, 0);
62 }
63}
64
65static int mqprio_parse_opt(struct net_device *dev, struct tc_mqprio_qopt *qopt)
66{
67 int i, j;
68
69
70 if (qopt->num_tc > TC_MAX_QUEUE)
71 return -EINVAL;
72
73
74 for (i = 0; i < TC_BITMASK + 1; i++) {
75 if (qopt->prio_tc_map[i] >= qopt->num_tc)
76 return -EINVAL;
77 }
78
79
80
81
82
83 if (qopt->hw > TC_MQPRIO_HW_OFFLOAD_MAX)
84 qopt->hw = TC_MQPRIO_HW_OFFLOAD_MAX;
85
86
87
88
89
90
91 if (qopt->hw)
92 return dev->netdev_ops->ndo_setup_tc ? 0 : -EINVAL;
93
94 for (i = 0; i < qopt->num_tc; i++) {
95 unsigned int last = qopt->offset[i] + qopt->count[i];
96
97
98
99
100 if (qopt->offset[i] >= dev->real_num_tx_queues ||
101 !qopt->count[i] ||
102 last > dev->real_num_tx_queues)
103 return -EINVAL;
104
105
106 for (j = i + 1; j < qopt->num_tc; j++) {
107 if (last > qopt->offset[j])
108 return -EINVAL;
109 }
110 }
111
112 return 0;
113}
114
115static const struct nla_policy mqprio_policy[TCA_MQPRIO_MAX + 1] = {
116 [TCA_MQPRIO_MODE] = { .len = sizeof(u16) },
117 [TCA_MQPRIO_SHAPER] = { .len = sizeof(u16) },
118 [TCA_MQPRIO_MIN_RATE64] = { .type = NLA_NESTED },
119 [TCA_MQPRIO_MAX_RATE64] = { .type = NLA_NESTED },
120};
121
122static int parse_attr(struct nlattr *tb[], int maxtype, struct nlattr *nla,
123 const struct nla_policy *policy, int len)
124{
125 int nested_len = nla_len(nla) - NLA_ALIGN(len);
126
127 if (nested_len >= nla_attr_size(0))
128 return nla_parse(tb, maxtype, nla_data(nla) + NLA_ALIGN(len),
129 nested_len, policy, NULL);
130
131 memset(tb, 0, sizeof(struct nlattr *) * (maxtype + 1));
132 return 0;
133}
134
135static int mqprio_init(struct Qdisc *sch, struct nlattr *opt,
136 struct netlink_ext_ack *extack)
137{
138 struct net_device *dev = qdisc_dev(sch);
139 struct mqprio_sched *priv = qdisc_priv(sch);
140 struct netdev_queue *dev_queue;
141 struct Qdisc *qdisc;
142 int i, err = -EOPNOTSUPP;
143 struct tc_mqprio_qopt *qopt = NULL;
144 struct nlattr *tb[TCA_MQPRIO_MAX + 1];
145 struct nlattr *attr;
146 int rem;
147 int len;
148
149 BUILD_BUG_ON(TC_MAX_QUEUE != TC_QOPT_MAX_QUEUE);
150 BUILD_BUG_ON(TC_BITMASK != TC_QOPT_BITMASK);
151
152 if (sch->parent != TC_H_ROOT)
153 return -EOPNOTSUPP;
154
155 if (!netif_is_multiqueue(dev))
156 return -EOPNOTSUPP;
157
158
159 if (dev->num_tx_queues >= TC_H_MIN_PRIORITY)
160 return -ENOMEM;
161
162 if (!opt || nla_len(opt) < sizeof(*qopt))
163 return -EINVAL;
164
165 qopt = nla_data(opt);
166 if (mqprio_parse_opt(dev, qopt))
167 return -EINVAL;
168
169 len = nla_len(opt) - NLA_ALIGN(sizeof(*qopt));
170 if (len > 0) {
171 err = parse_attr(tb, TCA_MQPRIO_MAX, opt, mqprio_policy,
172 sizeof(*qopt));
173 if (err < 0)
174 return err;
175
176 if (!qopt->hw)
177 return -EINVAL;
178
179 if (tb[TCA_MQPRIO_MODE]) {
180 priv->flags |= TC_MQPRIO_F_MODE;
181 priv->mode = *(u16 *)nla_data(tb[TCA_MQPRIO_MODE]);
182 }
183
184 if (tb[TCA_MQPRIO_SHAPER]) {
185 priv->flags |= TC_MQPRIO_F_SHAPER;
186 priv->shaper = *(u16 *)nla_data(tb[TCA_MQPRIO_SHAPER]);
187 }
188
189 if (tb[TCA_MQPRIO_MIN_RATE64]) {
190 if (priv->shaper != TC_MQPRIO_SHAPER_BW_RATE)
191 return -EINVAL;
192 i = 0;
193 nla_for_each_nested(attr, tb[TCA_MQPRIO_MIN_RATE64],
194 rem) {
195 if (nla_type(attr) != TCA_MQPRIO_MIN_RATE64)
196 return -EINVAL;
197 if (i >= qopt->num_tc)
198 break;
199 priv->min_rate[i] = *(u64 *)nla_data(attr);
200 i++;
201 }
202 priv->flags |= TC_MQPRIO_F_MIN_RATE;
203 }
204
205 if (tb[TCA_MQPRIO_MAX_RATE64]) {
206 if (priv->shaper != TC_MQPRIO_SHAPER_BW_RATE)
207 return -EINVAL;
208 i = 0;
209 nla_for_each_nested(attr, tb[TCA_MQPRIO_MAX_RATE64],
210 rem) {
211 if (nla_type(attr) != TCA_MQPRIO_MAX_RATE64)
212 return -EINVAL;
213 if (i >= qopt->num_tc)
214 break;
215 priv->max_rate[i] = *(u64 *)nla_data(attr);
216 i++;
217 }
218 priv->flags |= TC_MQPRIO_F_MAX_RATE;
219 }
220 }
221
222
223 priv->qdiscs = kcalloc(dev->num_tx_queues, sizeof(priv->qdiscs[0]),
224 GFP_KERNEL);
225 if (!priv->qdiscs)
226 return -ENOMEM;
227
228 for (i = 0; i < dev->num_tx_queues; i++) {
229 dev_queue = netdev_get_tx_queue(dev, i);
230 qdisc = qdisc_create_dflt(dev_queue,
231 get_default_qdisc_ops(dev, i),
232 TC_H_MAKE(TC_H_MAJ(sch->handle),
233 TC_H_MIN(i + 1)), extack);
234 if (!qdisc)
235 return -ENOMEM;
236
237 priv->qdiscs[i] = qdisc;
238 qdisc->flags |= TCQ_F_ONETXQUEUE | TCQ_F_NOPARENT;
239 }
240
241
242
243
244
245 if (qopt->hw) {
246 struct tc_mqprio_qopt_offload mqprio = {.qopt = *qopt};
247
248 switch (priv->mode) {
249 case TC_MQPRIO_MODE_DCB:
250 if (priv->shaper != TC_MQPRIO_SHAPER_DCB)
251 return -EINVAL;
252 break;
253 case TC_MQPRIO_MODE_CHANNEL:
254 mqprio.flags = priv->flags;
255 if (priv->flags & TC_MQPRIO_F_MODE)
256 mqprio.mode = priv->mode;
257 if (priv->flags & TC_MQPRIO_F_SHAPER)
258 mqprio.shaper = priv->shaper;
259 if (priv->flags & TC_MQPRIO_F_MIN_RATE)
260 for (i = 0; i < mqprio.qopt.num_tc; i++)
261 mqprio.min_rate[i] = priv->min_rate[i];
262 if (priv->flags & TC_MQPRIO_F_MAX_RATE)
263 for (i = 0; i < mqprio.qopt.num_tc; i++)
264 mqprio.max_rate[i] = priv->max_rate[i];
265 break;
266 default:
267 return -EINVAL;
268 }
269 err = dev->netdev_ops->ndo_setup_tc(dev,
270 TC_SETUP_QDISC_MQPRIO,
271 &mqprio);
272 if (err)
273 return err;
274
275 priv->hw_offload = mqprio.qopt.hw;
276 } else {
277 netdev_set_num_tc(dev, qopt->num_tc);
278 for (i = 0; i < qopt->num_tc; i++)
279 netdev_set_tc_queue(dev, i,
280 qopt->count[i], qopt->offset[i]);
281 }
282
283
284 for (i = 0; i < TC_BITMASK + 1; i++)
285 netdev_set_prio_tc_map(dev, i, qopt->prio_tc_map[i]);
286
287 sch->flags |= TCQ_F_MQROOT;
288 return 0;
289}
290
291static void mqprio_attach(struct Qdisc *sch)
292{
293 struct net_device *dev = qdisc_dev(sch);
294 struct mqprio_sched *priv = qdisc_priv(sch);
295 struct Qdisc *qdisc, *old;
296 unsigned int ntx;
297
298
299 for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
300 qdisc = priv->qdiscs[ntx];
301 old = dev_graft_qdisc(qdisc->dev_queue, qdisc);
302 if (old)
303 qdisc_destroy(old);
304 if (ntx < dev->real_num_tx_queues)
305 qdisc_hash_add(qdisc, false);
306 }
307 kfree(priv->qdiscs);
308 priv->qdiscs = NULL;
309}
310
311static struct netdev_queue *mqprio_queue_get(struct Qdisc *sch,
312 unsigned long cl)
313{
314 struct net_device *dev = qdisc_dev(sch);
315 unsigned long ntx = cl - 1;
316
317 if (ntx >= dev->num_tx_queues)
318 return NULL;
319 return netdev_get_tx_queue(dev, ntx);
320}
321
322static int mqprio_graft(struct Qdisc *sch, unsigned long cl, struct Qdisc *new,
323 struct Qdisc **old, struct netlink_ext_ack *extack)
324{
325 struct net_device *dev = qdisc_dev(sch);
326 struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
327
328 if (!dev_queue)
329 return -EINVAL;
330
331 if (dev->flags & IFF_UP)
332 dev_deactivate(dev);
333
334 *old = dev_graft_qdisc(dev_queue, new);
335
336 if (new)
337 new->flags |= TCQ_F_ONETXQUEUE | TCQ_F_NOPARENT;
338
339 if (dev->flags & IFF_UP)
340 dev_activate(dev);
341
342 return 0;
343}
344
345static int dump_rates(struct mqprio_sched *priv,
346 struct tc_mqprio_qopt *opt, struct sk_buff *skb)
347{
348 struct nlattr *nest;
349 int i;
350
351 if (priv->flags & TC_MQPRIO_F_MIN_RATE) {
352 nest = nla_nest_start(skb, TCA_MQPRIO_MIN_RATE64);
353 if (!nest)
354 goto nla_put_failure;
355
356 for (i = 0; i < opt->num_tc; i++) {
357 if (nla_put(skb, TCA_MQPRIO_MIN_RATE64,
358 sizeof(priv->min_rate[i]),
359 &priv->min_rate[i]))
360 goto nla_put_failure;
361 }
362 nla_nest_end(skb, nest);
363 }
364
365 if (priv->flags & TC_MQPRIO_F_MAX_RATE) {
366 nest = nla_nest_start(skb, TCA_MQPRIO_MAX_RATE64);
367 if (!nest)
368 goto nla_put_failure;
369
370 for (i = 0; i < opt->num_tc; i++) {
371 if (nla_put(skb, TCA_MQPRIO_MAX_RATE64,
372 sizeof(priv->max_rate[i]),
373 &priv->max_rate[i]))
374 goto nla_put_failure;
375 }
376 nla_nest_end(skb, nest);
377 }
378 return 0;
379
380nla_put_failure:
381 nla_nest_cancel(skb, nest);
382 return -1;
383}
384
385static int mqprio_dump(struct Qdisc *sch, struct sk_buff *skb)
386{
387 struct net_device *dev = qdisc_dev(sch);
388 struct mqprio_sched *priv = qdisc_priv(sch);
389 struct nlattr *nla = (struct nlattr *)skb_tail_pointer(skb);
390 struct tc_mqprio_qopt opt = { 0 };
391 struct Qdisc *qdisc;
392 unsigned int ntx, tc;
393
394 sch->q.qlen = 0;
395 memset(&sch->bstats, 0, sizeof(sch->bstats));
396 memset(&sch->qstats, 0, sizeof(sch->qstats));
397
398
399
400
401
402
403 for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
404 qdisc = netdev_get_tx_queue(dev, ntx)->qdisc_sleeping;
405 spin_lock_bh(qdisc_lock(qdisc));
406
407 if (qdisc_is_percpu_stats(qdisc)) {
408 __u32 qlen = qdisc_qlen_sum(qdisc);
409
410 __gnet_stats_copy_basic(NULL, &sch->bstats,
411 qdisc->cpu_bstats,
412 &qdisc->bstats);
413 __gnet_stats_copy_queue(&sch->qstats,
414 qdisc->cpu_qstats,
415 &qdisc->qstats, qlen);
416 } else {
417 sch->q.qlen += qdisc->q.qlen;
418 sch->bstats.bytes += qdisc->bstats.bytes;
419 sch->bstats.packets += qdisc->bstats.packets;
420 sch->qstats.backlog += qdisc->qstats.backlog;
421 sch->qstats.drops += qdisc->qstats.drops;
422 sch->qstats.requeues += qdisc->qstats.requeues;
423 sch->qstats.overlimits += qdisc->qstats.overlimits;
424 }
425
426 spin_unlock_bh(qdisc_lock(qdisc));
427 }
428
429 opt.num_tc = netdev_get_num_tc(dev);
430 memcpy(opt.prio_tc_map, dev->prio_tc_map, sizeof(opt.prio_tc_map));
431 opt.hw = priv->hw_offload;
432
433 for (tc = 0; tc < netdev_get_num_tc(dev); tc++) {
434 opt.count[tc] = dev->tc_to_txq[tc].count;
435 opt.offset[tc] = dev->tc_to_txq[tc].offset;
436 }
437
438 if (nla_put(skb, TCA_OPTIONS, NLA_ALIGN(sizeof(opt)), &opt))
439 goto nla_put_failure;
440
441 if ((priv->flags & TC_MQPRIO_F_MODE) &&
442 nla_put_u16(skb, TCA_MQPRIO_MODE, priv->mode))
443 goto nla_put_failure;
444
445 if ((priv->flags & TC_MQPRIO_F_SHAPER) &&
446 nla_put_u16(skb, TCA_MQPRIO_SHAPER, priv->shaper))
447 goto nla_put_failure;
448
449 if ((priv->flags & TC_MQPRIO_F_MIN_RATE ||
450 priv->flags & TC_MQPRIO_F_MAX_RATE) &&
451 (dump_rates(priv, &opt, skb) != 0))
452 goto nla_put_failure;
453
454 return nla_nest_end(skb, nla);
455nla_put_failure:
456 nlmsg_trim(skb, nla);
457 return -1;
458}
459
460static struct Qdisc *mqprio_leaf(struct Qdisc *sch, unsigned long cl)
461{
462 struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
463
464 if (!dev_queue)
465 return NULL;
466
467 return dev_queue->qdisc_sleeping;
468}
469
470static unsigned long mqprio_find(struct Qdisc *sch, u32 classid)
471{
472 struct net_device *dev = qdisc_dev(sch);
473 unsigned int ntx = TC_H_MIN(classid);
474
475
476
477
478
479 if (ntx < TC_H_MIN_PRIORITY)
480 return (ntx <= dev->num_tx_queues) ? ntx : 0;
481
482
483
484
485
486 return ((ntx - TC_H_MIN_PRIORITY) < netdev_get_num_tc(dev)) ? ntx : 0;
487}
488
489static int mqprio_dump_class(struct Qdisc *sch, unsigned long cl,
490 struct sk_buff *skb, struct tcmsg *tcm)
491{
492 if (cl < TC_H_MIN_PRIORITY) {
493 struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
494 struct net_device *dev = qdisc_dev(sch);
495 int tc = netdev_txq_to_tc(dev, cl - 1);
496
497 tcm->tcm_parent = (tc < 0) ? 0 :
498 TC_H_MAKE(TC_H_MAJ(sch->handle),
499 TC_H_MIN(tc + TC_H_MIN_PRIORITY));
500 tcm->tcm_info = dev_queue->qdisc_sleeping->handle;
501 } else {
502 tcm->tcm_parent = TC_H_ROOT;
503 tcm->tcm_info = 0;
504 }
505 tcm->tcm_handle |= TC_H_MIN(cl);
506 return 0;
507}
508
509static int mqprio_dump_class_stats(struct Qdisc *sch, unsigned long cl,
510 struct gnet_dump *d)
511 __releases(d->lock)
512 __acquires(d->lock)
513{
514 if (cl >= TC_H_MIN_PRIORITY) {
515 int i;
516 __u32 qlen = 0;
517 struct gnet_stats_queue qstats = {0};
518 struct gnet_stats_basic_packed bstats = {0};
519 struct net_device *dev = qdisc_dev(sch);
520 struct netdev_tc_txq tc = dev->tc_to_txq[cl & TC_BITMASK];
521
522
523
524
525
526
527 if (d->lock)
528 spin_unlock_bh(d->lock);
529
530 for (i = tc.offset; i < tc.offset + tc.count; i++) {
531 struct netdev_queue *q = netdev_get_tx_queue(dev, i);
532 struct Qdisc *qdisc = rtnl_dereference(q->qdisc);
533 struct gnet_stats_basic_cpu __percpu *cpu_bstats = NULL;
534 struct gnet_stats_queue __percpu *cpu_qstats = NULL;
535
536 spin_lock_bh(qdisc_lock(qdisc));
537 if (qdisc_is_percpu_stats(qdisc)) {
538 cpu_bstats = qdisc->cpu_bstats;
539 cpu_qstats = qdisc->cpu_qstats;
540 }
541
542 qlen = qdisc_qlen_sum(qdisc);
543 __gnet_stats_copy_basic(NULL, &sch->bstats,
544 cpu_bstats, &qdisc->bstats);
545 __gnet_stats_copy_queue(&sch->qstats,
546 cpu_qstats,
547 &qdisc->qstats,
548 qlen);
549 spin_unlock_bh(qdisc_lock(qdisc));
550 }
551
552
553 if (d->lock)
554 spin_lock_bh(d->lock);
555 if (gnet_stats_copy_basic(NULL, d, NULL, &bstats) < 0 ||
556 gnet_stats_copy_queue(d, NULL, &qstats, qlen) < 0)
557 return -1;
558 } else {
559 struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
560
561 sch = dev_queue->qdisc_sleeping;
562 if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch),
563 d, NULL, &sch->bstats) < 0 ||
564 gnet_stats_copy_queue(d, NULL,
565 &sch->qstats, sch->q.qlen) < 0)
566 return -1;
567 }
568 return 0;
569}
570
571static void mqprio_walk(struct Qdisc *sch, struct qdisc_walker *arg)
572{
573 struct net_device *dev = qdisc_dev(sch);
574 unsigned long ntx;
575
576 if (arg->stop)
577 return;
578
579
580 arg->count = arg->skip;
581 for (ntx = arg->skip; ntx < netdev_get_num_tc(dev); ntx++) {
582 if (arg->fn(sch, ntx + TC_H_MIN_PRIORITY, arg) < 0) {
583 arg->stop = 1;
584 return;
585 }
586 arg->count++;
587 }
588
589
590 if (ntx < TC_MAX_QUEUE) {
591 arg->count = TC_MAX_QUEUE;
592 ntx = TC_MAX_QUEUE;
593 }
594
595
596 for (ntx -= TC_MAX_QUEUE; ntx < dev->num_tx_queues; ntx++) {
597 if (arg->fn(sch, ntx + 1, arg) < 0) {
598 arg->stop = 1;
599 return;
600 }
601 arg->count++;
602 }
603}
604
605static struct netdev_queue *mqprio_select_queue(struct Qdisc *sch,
606 struct tcmsg *tcm)
607{
608 return mqprio_queue_get(sch, TC_H_MIN(tcm->tcm_parent));
609}
610
611static const struct Qdisc_class_ops mqprio_class_ops = {
612 .graft = mqprio_graft,
613 .leaf = mqprio_leaf,
614 .find = mqprio_find,
615 .walk = mqprio_walk,
616 .dump = mqprio_dump_class,
617 .dump_stats = mqprio_dump_class_stats,
618 .select_queue = mqprio_select_queue,
619};
620
621static struct Qdisc_ops mqprio_qdisc_ops __read_mostly = {
622 .cl_ops = &mqprio_class_ops,
623 .id = "mqprio",
624 .priv_size = sizeof(struct mqprio_sched),
625 .init = mqprio_init,
626 .destroy = mqprio_destroy,
627 .attach = mqprio_attach,
628 .dump = mqprio_dump,
629 .owner = THIS_MODULE,
630};
631
632static int __init mqprio_module_init(void)
633{
634 return register_qdisc(&mqprio_qdisc_ops);
635}
636
637static void __exit mqprio_module_exit(void)
638{
639 unregister_qdisc(&mqprio_qdisc_ops);
640}
641
642module_init(mqprio_module_init);
643module_exit(mqprio_module_exit);
644
645MODULE_LICENSE("GPL");
646
