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Linux 5.7.7
[linux/fpc-iii.git] / net / sched / sch_ets.c
bloba87e9159338c48271d8a2eaee0253721dd48d180
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * net/sched/sch_ets.c Enhanced Transmission Selection scheduler
4 *
5 * Description
6 * -----------
7 *
8 * The Enhanced Transmission Selection scheduler is a classful queuing
9 * discipline that merges functionality of PRIO and DRR qdiscs in one scheduler.
10 * ETS makes it easy to configure a set of strict and bandwidth-sharing bands to
11 * implement the transmission selection described in 802.1Qaz.
12 *
13 * Although ETS is technically classful, it's not possible to add and remove
14 * classes at will. Instead one specifies number of classes, how many are
15 * PRIO-like and how many DRR-like, and quanta for the latter.
16 *
17 * Algorithm
18 * ---------
19 *
20 * The strict classes, if any, are tried for traffic first: first band 0, if it
21 * has no traffic then band 1, etc.
22 *
23 * When there is no traffic in any of the strict queues, the bandwidth-sharing
24 * ones are tried next. Each band is assigned a deficit counter, initialized to
25 * "quantum" of that band. ETS maintains a list of active bandwidth-sharing
26 * bands whose qdiscs are non-empty. A packet is dequeued from the band at the
27 * head of the list if the packet size is smaller or equal to the deficit
28 * counter. If the counter is too small, it is increased by "quantum" and the
29 * scheduler moves on to the next band in the active list.
30 */
31
32 #include <linux/module.h>
33 #include <net/gen_stats.h>
34 #include <net/netlink.h>
35 #include <net/pkt_cls.h>
36 #include <net/pkt_sched.h>
37 #include <net/sch_generic.h>
38
39 struct ets_class {
40 struct list_head alist; /* In struct ets_sched.active. */
41 struct Qdisc *qdisc;
42 u32 quantum;
43 u32 deficit;
44 struct gnet_stats_basic_packed bstats;
45 struct gnet_stats_queue qstats;
46 };
47
48 struct ets_sched {
49 struct list_head active;
50 struct tcf_proto __rcu *filter_list;
51 struct tcf_block *block;
52 unsigned int nbands;
53 unsigned int nstrict;
54 u8 prio2band[TC_PRIO_MAX + 1];
55 struct ets_class classes[TCQ_ETS_MAX_BANDS];
56 };
57
58 static const struct nla_policy ets_policy[TCA_ETS_MAX + 1] = {
59 [TCA_ETS_NBANDS] = { .type = NLA_U8 },
60 [TCA_ETS_NSTRICT] = { .type = NLA_U8 },
61 [TCA_ETS_QUANTA] = { .type = NLA_NESTED },
62 [TCA_ETS_PRIOMAP] = { .type = NLA_NESTED },
63 };
64
65 static const struct nla_policy ets_priomap_policy[TCA_ETS_MAX + 1] = {
66 [TCA_ETS_PRIOMAP_BAND] = { .type = NLA_U8 },
67 };
68
69 static const struct nla_policy ets_quanta_policy[TCA_ETS_MAX + 1] = {
70 [TCA_ETS_QUANTA_BAND] = { .type = NLA_U32 },
71 };
72
73 static const struct nla_policy ets_class_policy[TCA_ETS_MAX + 1] = {
74 [TCA_ETS_QUANTA_BAND] = { .type = NLA_U32 },
75 };
76
77 static int ets_quantum_parse(struct Qdisc *sch, const struct nlattr *attr,
78 unsigned int *quantum,
79 struct netlink_ext_ack *extack)
80 {
81 *quantum = nla_get_u32(attr);
82 if (!*quantum) {
83 NL_SET_ERR_MSG(extack, "ETS quantum cannot be zero");
84 return -EINVAL;
85 }
86 return 0;
87 }
88
89 static struct ets_class *
90 ets_class_from_arg(struct Qdisc *sch, unsigned long arg)
91 {
92 struct ets_sched *q = qdisc_priv(sch);
93
94 return &q->classes[arg - 1];
95 }
96
97 static u32 ets_class_id(struct Qdisc *sch, const struct ets_class *cl)
98 {
99 struct ets_sched *q = qdisc_priv(sch);
100 int band = cl - q->classes;
101
102 return TC_H_MAKE(sch->handle, band + 1);
103 }
104
105 static void ets_offload_change(struct Qdisc *sch)
106 {
107 struct net_device *dev = qdisc_dev(sch);
108 struct ets_sched *q = qdisc_priv(sch);
109 struct tc_ets_qopt_offload qopt;
110 unsigned int w_psum_prev = 0;
111 unsigned int q_psum = 0;
112 unsigned int q_sum = 0;
113 unsigned int quantum;
114 unsigned int w_psum;
115 unsigned int weight;
116 unsigned int i;
117
118 if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc)
119 return;
120
121 qopt.command = TC_ETS_REPLACE;
122 qopt.handle = sch->handle;
123 qopt.parent = sch->parent;
124 qopt.replace_params.bands = q->nbands;
125 qopt.replace_params.qstats = &sch->qstats;
126 memcpy(&qopt.replace_params.priomap,
127 q->prio2band, sizeof(q->prio2band));
128
129 for (i = 0; i < q->nbands; i++)
130 q_sum += q->classes[i].quantum;
131
132 for (i = 0; i < q->nbands; i++) {
133 quantum = q->classes[i].quantum;
134 q_psum += quantum;
135 w_psum = quantum ? q_psum * 100 / q_sum : 0;
136 weight = w_psum - w_psum_prev;
137 w_psum_prev = w_psum;
138
139 qopt.replace_params.quanta[i] = quantum;
140 qopt.replace_params.weights[i] = weight;
141 }
142
143 dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_QDISC_ETS, &qopt);
144 }
145
146 static void ets_offload_destroy(struct Qdisc *sch)
147 {
148 struct net_device *dev = qdisc_dev(sch);
149 struct tc_ets_qopt_offload qopt;
150
151 if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc)
152 return;
153
154 qopt.command = TC_ETS_DESTROY;
155 qopt.handle = sch->handle;
156 qopt.parent = sch->parent;
157 dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_QDISC_ETS, &qopt);
158 }
159
160 static void ets_offload_graft(struct Qdisc *sch, struct Qdisc *new,
161 struct Qdisc *old, unsigned long arg,
162 struct netlink_ext_ack *extack)
163 {
164 struct net_device *dev = qdisc_dev(sch);
165 struct tc_ets_qopt_offload qopt;
166
167 qopt.command = TC_ETS_GRAFT;
168 qopt.handle = sch->handle;
169 qopt.parent = sch->parent;
170 qopt.graft_params.band = arg - 1;
171 qopt.graft_params.child_handle = new->handle;
172
173 qdisc_offload_graft_helper(dev, sch, new, old, TC_SETUP_QDISC_ETS,
174 &qopt, extack);
175 }
176
177 static int ets_offload_dump(struct Qdisc *sch)
178 {
179 struct tc_ets_qopt_offload qopt;
180
181 qopt.command = TC_ETS_STATS;
182 qopt.handle = sch->handle;
183 qopt.parent = sch->parent;
184 qopt.stats.bstats = &sch->bstats;
185 qopt.stats.qstats = &sch->qstats;
186
187 return qdisc_offload_dump_helper(sch, TC_SETUP_QDISC_ETS, &qopt);
188 }
189
190 static bool ets_class_is_strict(struct ets_sched *q, const struct ets_class *cl)
191 {
192 unsigned int band = cl - q->classes;
193
194 return band < q->nstrict;
195 }
196
197 static int ets_class_change(struct Qdisc *sch, u32 classid, u32 parentid,
198 struct nlattr **tca, unsigned long *arg,
199 struct netlink_ext_ack *extack)
200 {
201 struct ets_class *cl = ets_class_from_arg(sch, *arg);
202 struct ets_sched *q = qdisc_priv(sch);
203 struct nlattr *opt = tca[TCA_OPTIONS];
204 struct nlattr *tb[TCA_ETS_MAX + 1];
205 unsigned int quantum;
206 int err;
207
208 /* Classes can be added and removed only through Qdisc_ops.change
209 * interface.
210 */
211 if (!cl) {
212 NL_SET_ERR_MSG(extack, "Fine-grained class addition and removal is not supported");
213 return -EOPNOTSUPP;
214 }
215
216 if (!opt) {
217 NL_SET_ERR_MSG(extack, "ETS options are required for this operation");
218 return -EINVAL;
219 }
220
221 err = nla_parse_nested(tb, TCA_ETS_MAX, opt, ets_class_policy, extack);
222 if (err < 0)
223 return err;
224
225 if (!tb[TCA_ETS_QUANTA_BAND])
226 /* Nothing to configure. */
227 return 0;
228
229 if (ets_class_is_strict(q, cl)) {
230 NL_SET_ERR_MSG(extack, "Strict bands do not have a configurable quantum");
231 return -EINVAL;
232 }
233
234 err = ets_quantum_parse(sch, tb[TCA_ETS_QUANTA_BAND], &quantum,
235 extack);
236 if (err)
237 return err;
238
239 sch_tree_lock(sch);
240 cl->quantum = quantum;
241 sch_tree_unlock(sch);
242
243 ets_offload_change(sch);
244 return 0;
245 }
246
247 static int ets_class_graft(struct Qdisc *sch, unsigned long arg,
248 struct Qdisc *new, struct Qdisc **old,
249 struct netlink_ext_ack *extack)
250 {
251 struct ets_class *cl = ets_class_from_arg(sch, arg);
252
253 if (!new) {
254 new = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops,
255 ets_class_id(sch, cl), NULL);
256 if (!new)
257 new = &noop_qdisc;
258 else
259 qdisc_hash_add(new, true);
260 }
261
262 *old = qdisc_replace(sch, new, &cl->qdisc);
263 ets_offload_graft(sch, new, *old, arg, extack);
264 return 0;
265 }
266
267 static struct Qdisc *ets_class_leaf(struct Qdisc *sch, unsigned long arg)
268 {
269 struct ets_class *cl = ets_class_from_arg(sch, arg);
270
271 return cl->qdisc;
272 }
273
274 static unsigned long ets_class_find(struct Qdisc *sch, u32 classid)
275 {
276 unsigned long band = TC_H_MIN(classid);
277 struct ets_sched *q = qdisc_priv(sch);
278
279 if (band - 1 >= q->nbands)
280 return 0;
281 return band;
282 }
283
284 static void ets_class_qlen_notify(struct Qdisc *sch, unsigned long arg)
285 {
286 struct ets_class *cl = ets_class_from_arg(sch, arg);
287 struct ets_sched *q = qdisc_priv(sch);
288
289 /* We get notified about zero-length child Qdiscs as well if they are
290 * offloaded. Those aren't on the active list though, so don't attempt
291 * to remove them.
292 */
293 if (!ets_class_is_strict(q, cl) && sch->q.qlen)
294 list_del(&cl->alist);
295 }
296
297 static int ets_class_dump(struct Qdisc *sch, unsigned long arg,
298 struct sk_buff *skb, struct tcmsg *tcm)
299 {
300 struct ets_class *cl = ets_class_from_arg(sch, arg);
301 struct ets_sched *q = qdisc_priv(sch);
302 struct nlattr *nest;
303
304 tcm->tcm_parent = TC_H_ROOT;
305 tcm->tcm_handle = ets_class_id(sch, cl);
306 tcm->tcm_info = cl->qdisc->handle;
307
308 nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
309 if (!nest)
310 goto nla_put_failure;
311 if (!ets_class_is_strict(q, cl)) {
312 if (nla_put_u32(skb, TCA_ETS_QUANTA_BAND, cl->quantum))
313 goto nla_put_failure;
314 }
315 return nla_nest_end(skb, nest);
316
317 nla_put_failure:
318 nla_nest_cancel(skb, nest);
319 return -EMSGSIZE;
320 }
321
322 static int ets_class_dump_stats(struct Qdisc *sch, unsigned long arg,
323 struct gnet_dump *d)
324 {
325 struct ets_class *cl = ets_class_from_arg(sch, arg);
326 struct Qdisc *cl_q = cl->qdisc;
327
328 if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch),
329 d, NULL, &cl_q->bstats) < 0 ||
330 qdisc_qstats_copy(d, cl_q) < 0)
331 return -1;
332
333 return 0;
334 }
335
336 static void ets_qdisc_walk(struct Qdisc *sch, struct qdisc_walker *arg)
337 {
338 struct ets_sched *q = qdisc_priv(sch);
339 int i;
340
341 if (arg->stop)
342 return;
343
344 for (i = 0; i < q->nbands; i++) {
345 if (arg->count < arg->skip) {
346 arg->count++;
347 continue;
348 }
349 if (arg->fn(sch, i + 1, arg) < 0) {
350 arg->stop = 1;
351 break;
352 }
353 arg->count++;
354 }
355 }
356
357 static struct tcf_block *
358 ets_qdisc_tcf_block(struct Qdisc *sch, unsigned long cl,
359 struct netlink_ext_ack *extack)
360 {
361 struct ets_sched *q = qdisc_priv(sch);
362
363 if (cl) {
364 NL_SET_ERR_MSG(extack, "ETS classid must be zero");
365 return NULL;
366 }
367
368 return q->block;
369 }
370
371 static unsigned long ets_qdisc_bind_tcf(struct Qdisc *sch, unsigned long parent,
372 u32 classid)
373 {
374 return ets_class_find(sch, classid);
375 }
376
377 static void ets_qdisc_unbind_tcf(struct Qdisc *sch, unsigned long arg)
378 {
379 }
380
381 static struct ets_class *ets_classify(struct sk_buff *skb, struct Qdisc *sch,
382 int *qerr)
383 {
384 struct ets_sched *q = qdisc_priv(sch);
385 u32 band = skb->priority;
386 struct tcf_result res;
387 struct tcf_proto *fl;
388 int err;
389
390 *qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
391 if (TC_H_MAJ(skb->priority) != sch->handle) {
392 fl = rcu_dereference_bh(q->filter_list);
393 err = tcf_classify(skb, fl, &res, false);
394 #ifdef CONFIG_NET_CLS_ACT
395 switch (err) {
396 case TC_ACT_STOLEN:
397 case TC_ACT_QUEUED:
398 case TC_ACT_TRAP:
399 *qerr = NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
400 /* fall through */
401 case TC_ACT_SHOT:
402 return NULL;
403 }
404 #endif
405 if (!fl || err < 0) {
406 if (TC_H_MAJ(band))
407 band = 0;
408 return &q->classes[q->prio2band[band & TC_PRIO_MAX]];
409 }
410 band = res.classid;
411 }
412 band = TC_H_MIN(band) - 1;
413 if (band >= q->nbands)
414 return &q->classes[q->prio2band[0]];
415 return &q->classes[band];
416 }
417
418 static int ets_qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
419 struct sk_buff **to_free)
420 {
421 unsigned int len = qdisc_pkt_len(skb);
422 struct ets_sched *q = qdisc_priv(sch);
423 struct ets_class *cl;
424 int err = 0;
425 bool first;
426
427 cl = ets_classify(skb, sch, &err);
428 if (!cl) {
429 if (err & __NET_XMIT_BYPASS)
430 qdisc_qstats_drop(sch);
431 __qdisc_drop(skb, to_free);
432 return err;
433 }
434
435 first = !cl->qdisc->q.qlen;
436 err = qdisc_enqueue(skb, cl->qdisc, to_free);
437 if (unlikely(err != NET_XMIT_SUCCESS)) {
438 if (net_xmit_drop_count(err)) {
439 cl->qstats.drops++;
440 qdisc_qstats_drop(sch);
441 }
442 return err;
443 }
444
445 if (first && !ets_class_is_strict(q, cl)) {
446 list_add_tail(&cl->alist, &q->active);
447 cl->deficit = cl->quantum;
448 }
449
450 sch->qstats.backlog += len;
451 sch->q.qlen++;
452 return err;
453 }
454
455 static struct sk_buff *
456 ets_qdisc_dequeue_skb(struct Qdisc *sch, struct sk_buff *skb)
457 {
458 qdisc_bstats_update(sch, skb);
459 qdisc_qstats_backlog_dec(sch, skb);
460 sch->q.qlen--;
461 return skb;
462 }
463
464 static struct sk_buff *ets_qdisc_dequeue(struct Qdisc *sch)
465 {
466 struct ets_sched *q = qdisc_priv(sch);
467 struct ets_class *cl;
468 struct sk_buff *skb;
469 unsigned int band;
470 unsigned int len;
471
472 while (1) {
473 for (band = 0; band < q->nstrict; band++) {
474 cl = &q->classes[band];
475 skb = qdisc_dequeue_peeked(cl->qdisc);
476 if (skb)
477 return ets_qdisc_dequeue_skb(sch, skb);
478 }
479
480 if (list_empty(&q->active))
481 goto out;
482
483 cl = list_first_entry(&q->active, struct ets_class, alist);
484 skb = cl->qdisc->ops->peek(cl->qdisc);
485 if (!skb) {
486 qdisc_warn_nonwc(__func__, cl->qdisc);
487 goto out;
488 }
489
490 len = qdisc_pkt_len(skb);
491 if (len <= cl->deficit) {
492 cl->deficit -= len;
493 skb = qdisc_dequeue_peeked(cl->qdisc);
494 if (unlikely(!skb))
495 goto out;
496 if (cl->qdisc->q.qlen == 0)
497 list_del(&cl->alist);
498 return ets_qdisc_dequeue_skb(sch, skb);
499 }
500
501 cl->deficit += cl->quantum;
502 list_move_tail(&cl->alist, &q->active);
503 }
504 out:
505 return NULL;
506 }
507
508 static int ets_qdisc_priomap_parse(struct nlattr *priomap_attr,
509 unsigned int nbands, u8 *priomap,
510 struct netlink_ext_ack *extack)
511 {
512 const struct nlattr *attr;
513 int prio = 0;
514 u8 band;
515 int rem;
516 int err;
517
518 err = __nla_validate_nested(priomap_attr, TCA_ETS_MAX,
519 ets_priomap_policy, NL_VALIDATE_STRICT,
520 extack);
521 if (err)
522 return err;
523
524 nla_for_each_nested(attr, priomap_attr, rem) {
525 switch (nla_type(attr)) {
526 case TCA_ETS_PRIOMAP_BAND:
527 if (prio > TC_PRIO_MAX) {
528 NL_SET_ERR_MSG_MOD(extack, "Too many priorities in ETS priomap");
529 return -EINVAL;
530 }
531 band = nla_get_u8(attr);
532 if (band >= nbands) {
533 NL_SET_ERR_MSG_MOD(extack, "Invalid band number in ETS priomap");
534 return -EINVAL;
535 }
536 priomap[prio++] = band;
537 break;
538 default:
539 WARN_ON_ONCE(1); /* Validate should have caught this. */
540 return -EINVAL;
541 }
542 }
543
544 return 0;
545 }
546
547 static int ets_qdisc_quanta_parse(struct Qdisc *sch, struct nlattr *quanta_attr,
548 unsigned int nbands, unsigned int nstrict,
549 unsigned int *quanta,
550 struct netlink_ext_ack *extack)
551 {
552 const struct nlattr *attr;
553 int band = nstrict;
554 int rem;
555 int err;
556
557 err = __nla_validate_nested(quanta_attr, TCA_ETS_MAX,
558 ets_quanta_policy, NL_VALIDATE_STRICT,
559 extack);
560 if (err < 0)
561 return err;
562
563 nla_for_each_nested(attr, quanta_attr, rem) {
564 switch (nla_type(attr)) {
565 case TCA_ETS_QUANTA_BAND:
566 if (band >= nbands) {
567 NL_SET_ERR_MSG_MOD(extack, "ETS quanta has more values than bands");
568 return -EINVAL;
569 }
570 err = ets_quantum_parse(sch, attr, &quanta[band++],
571 extack);
572 if (err)
573 return err;
574 break;
575 default:
576 WARN_ON_ONCE(1); /* Validate should have caught this. */
577 return -EINVAL;
578 }
579 }
580
581 return 0;
582 }
583
584 static int ets_qdisc_change(struct Qdisc *sch, struct nlattr *opt,
585 struct netlink_ext_ack *extack)
586 {
587 unsigned int quanta[TCQ_ETS_MAX_BANDS] = {0};
588 struct Qdisc *queues[TCQ_ETS_MAX_BANDS];
589 struct ets_sched *q = qdisc_priv(sch);
590 struct nlattr *tb[TCA_ETS_MAX + 1];
591 unsigned int oldbands = q->nbands;
592 u8 priomap[TC_PRIO_MAX + 1];
593 unsigned int nstrict = 0;
594 unsigned int nbands;
595 unsigned int i;
596 int err;
597
598 if (!opt) {
599 NL_SET_ERR_MSG(extack, "ETS options are required for this operation");
600 return -EINVAL;
601 }
602
603 err = nla_parse_nested(tb, TCA_ETS_MAX, opt, ets_policy, extack);
604 if (err < 0)
605 return err;
606
607 if (!tb[TCA_ETS_NBANDS]) {
608 NL_SET_ERR_MSG_MOD(extack, "Number of bands is a required argument");
609 return -EINVAL;
610 }
611 nbands = nla_get_u8(tb[TCA_ETS_NBANDS]);
612 if (nbands < 1 || nbands > TCQ_ETS_MAX_BANDS) {
613 NL_SET_ERR_MSG_MOD(extack, "Invalid number of bands");
614 return -EINVAL;
615 }
616 /* Unless overridden, traffic goes to the last band. */
617 memset(priomap, nbands - 1, sizeof(priomap));
618
619 if (tb[TCA_ETS_NSTRICT]) {
620 nstrict = nla_get_u8(tb[TCA_ETS_NSTRICT]);
621 if (nstrict > nbands) {
622 NL_SET_ERR_MSG_MOD(extack, "Invalid number of strict bands");
623 return -EINVAL;
624 }
625 }
626
627 if (tb[TCA_ETS_PRIOMAP]) {
628 err = ets_qdisc_priomap_parse(tb[TCA_ETS_PRIOMAP],
629 nbands, priomap, extack);
630 if (err)
631 return err;
632 }
633
634 if (tb[TCA_ETS_QUANTA]) {
635 err = ets_qdisc_quanta_parse(sch, tb[TCA_ETS_QUANTA],
636 nbands, nstrict, quanta, extack);
637 if (err)
638 return err;
639 }
640 /* If there are more bands than strict + quanta provided, the remaining
641 * ones are ETS with quantum of MTU. Initialize the missing values here.
642 */
643 for (i = nstrict; i < nbands; i++) {
644 if (!quanta[i])
645 quanta[i] = psched_mtu(qdisc_dev(sch));
646 }
647
648 /* Before commit, make sure we can allocate all new qdiscs */
649 for (i = oldbands; i < nbands; i++) {
650 queues[i] = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops,
651 ets_class_id(sch, &q->classes[i]),
652 extack);
653 if (!queues[i]) {
654 while (i > oldbands)
655 qdisc_put(queues[--i]);
656 return -ENOMEM;
657 }
658 }
659
660 sch_tree_lock(sch);
661
662 q->nbands = nbands;
663 q->nstrict = nstrict;
664 memcpy(q->prio2band, priomap, sizeof(priomap));
665
666 for (i = q->nbands; i < oldbands; i++)
667 qdisc_tree_flush_backlog(q->classes[i].qdisc);
668
669 for (i = 0; i < q->nbands; i++)
670 q->classes[i].quantum = quanta[i];
671
672 for (i = oldbands; i < q->nbands; i++) {
673 q->classes[i].qdisc = queues[i];
674 if (q->classes[i].qdisc != &noop_qdisc)
675 qdisc_hash_add(q->classes[i].qdisc, true);
676 }
677
678 sch_tree_unlock(sch);
679
680 ets_offload_change(sch);
681 for (i = q->nbands; i < oldbands; i++) {
682 qdisc_put(q->classes[i].qdisc);
683 memset(&q->classes[i], 0, sizeof(q->classes[i]));
684 }
685 return 0;
686 }
687
688 static int ets_qdisc_init(struct Qdisc *sch, struct nlattr *opt,
689 struct netlink_ext_ack *extack)
690 {
691 struct ets_sched *q = qdisc_priv(sch);
692 int err;
693
694 if (!opt)
695 return -EINVAL;
696
697 err = tcf_block_get(&q->block, &q->filter_list, sch, extack);
698 if (err)
699 return err;
700
701 INIT_LIST_HEAD(&q->active);
702 return ets_qdisc_change(sch, opt, extack);
703 }
704
705 static void ets_qdisc_reset(struct Qdisc *sch)
706 {
707 struct ets_sched *q = qdisc_priv(sch);
708 int band;
709
710 for (band = q->nstrict; band < q->nbands; band++) {
711 if (q->classes[band].qdisc->q.qlen)
712 list_del(&q->classes[band].alist);
713 }
714 for (band = 0; band < q->nbands; band++)
715 qdisc_reset(q->classes[band].qdisc);
716 sch->qstats.backlog = 0;
717 sch->q.qlen = 0;
718 }
719
720 static void ets_qdisc_destroy(struct Qdisc *sch)
721 {
722 struct ets_sched *q = qdisc_priv(sch);
723 int band;
724
725 ets_offload_destroy(sch);
726 tcf_block_put(q->block);
727 for (band = 0; band < q->nbands; band++)
728 qdisc_put(q->classes[band].qdisc);
729 }
730
731 static int ets_qdisc_dump(struct Qdisc *sch, struct sk_buff *skb)
732 {
733 struct ets_sched *q = qdisc_priv(sch);
734 struct nlattr *opts;
735 struct nlattr *nest;
736 int band;
737 int prio;
738 int err;
739
740 err = ets_offload_dump(sch);
741 if (err)
742 return err;
743
744 opts = nla_nest_start_noflag(skb, TCA_OPTIONS);
745 if (!opts)
746 goto nla_err;
747
748 if (nla_put_u8(skb, TCA_ETS_NBANDS, q->nbands))
749 goto nla_err;
750
751 if (q->nstrict &&
752 nla_put_u8(skb, TCA_ETS_NSTRICT, q->nstrict))
753 goto nla_err;
754
755 if (q->nbands > q->nstrict) {
756 nest = nla_nest_start(skb, TCA_ETS_QUANTA);
757 if (!nest)
758 goto nla_err;
759
760 for (band = q->nstrict; band < q->nbands; band++) {
761 if (nla_put_u32(skb, TCA_ETS_QUANTA_BAND,
762 q->classes[band].quantum))
763 goto nla_err;
764 }
765
766 nla_nest_end(skb, nest);
767 }
768
769 nest = nla_nest_start(skb, TCA_ETS_PRIOMAP);
770 if (!nest)
771 goto nla_err;
772
773 for (prio = 0; prio <= TC_PRIO_MAX; prio++) {
774 if (nla_put_u8(skb, TCA_ETS_PRIOMAP_BAND, q->prio2band[prio]))
775 goto nla_err;
776 }
777
778 nla_nest_end(skb, nest);
779
780 return nla_nest_end(skb, opts);
781
782 nla_err:
783 nla_nest_cancel(skb, opts);
784 return -EMSGSIZE;
785 }
786
787 static const struct Qdisc_class_ops ets_class_ops = {
788 .change = ets_class_change,
789 .graft = ets_class_graft,
790 .leaf = ets_class_leaf,
791 .find = ets_class_find,
792 .qlen_notify = ets_class_qlen_notify,
793 .dump = ets_class_dump,
794 .dump_stats = ets_class_dump_stats,
795 .walk = ets_qdisc_walk,
796 .tcf_block = ets_qdisc_tcf_block,
797 .bind_tcf = ets_qdisc_bind_tcf,
798 .unbind_tcf = ets_qdisc_unbind_tcf,
799 };
800
801 static struct Qdisc_ops ets_qdisc_ops __read_mostly = {
802 .cl_ops = &ets_class_ops,
803 .id = "ets",
804 .priv_size = sizeof(struct ets_sched),
805 .enqueue = ets_qdisc_enqueue,
806 .dequeue = ets_qdisc_dequeue,
807 .peek = qdisc_peek_dequeued,
808 .change = ets_qdisc_change,
809 .init = ets_qdisc_init,
810 .reset = ets_qdisc_reset,
811 .destroy = ets_qdisc_destroy,
812 .dump = ets_qdisc_dump,
813 .owner = THIS_MODULE,
814 };
815
816 static int __init ets_init(void)
817 {
818 return register_qdisc(&ets_qdisc_ops);
819 }
820
821 static void __exit ets_exit(void)
822 {
823 unregister_qdisc(&ets_qdisc_ops);
824 }
825
826 module_init(ets_init);
827 module_exit(ets_exit);
828 MODULE_LICENSE("GPL");
Linux with added FPC-III support