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net-sched: sch_hfsc: use dynamic class hash helpers
[linux-2.6-block.git] / net / sched / sch_cbq.c
CommitLineData
1da177e4
LT		 1/*
2 * net/sched/sch_cbq.c Class-Based Queueing discipline.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
10 *
11 */
12
1da177e4 13#include <linux/module.h>
1da177e4
LT		 14#include <linux/types.h>
15#include <linux/kernel.h>
1da177e4 16#include <linux/string.h>
1da177e4 17#include <linux/errno.h>
1da177e4 18#include <linux/skbuff.h>
0ba48053 19#include <net/netlink.h>
1da177e4
LT		 20#include <net/pkt_sched.h>
21
22
23/* Class-Based Queueing (CBQ) algorithm.
24 =======================================
25
26 Sources: [1] Sally Floyd and Van Jacobson, "Link-sharing and Resource
10297b99 27 Management Models for Packet Networks",
1da177e4
LT		 28 IEEE/ACM Transactions on Networking, Vol.3, No.4, 1995
29
10297b99 30 [2] Sally Floyd, "Notes on CBQ and Guaranteed Service", 1995
1da177e4 31
10297b99 32 [3] Sally Floyd, "Notes on Class-Based Queueing: Setting
1da177e4
LT		 33 Parameters", 1996
34
35 [4] Sally Floyd and Michael Speer, "Experimental Results
36 for Class-Based Queueing", 1998, not published.
37
38 -----------------------------------------------------------------------
39
40 Algorithm skeleton was taken from NS simulator cbq.cc.
41 If someone wants to check this code against the LBL version,
42 he should take into account that ONLY the skeleton was borrowed,
43 the implementation is different. Particularly:
44
45 --- The WRR algorithm is different. Our version looks more
10297b99
YH		 46 reasonable (I hope) and works when quanta are allowed to be
47 less than MTU, which is always the case when real time classes
48 have small rates. Note, that the statement of [3] is
49 incomplete, delay may actually be estimated even if class
50 per-round allotment is less than MTU. Namely, if per-round
51 allotment is W*r_i, and r_1+...+r_k = r < 1
1da177e4
LT		 52
53 delay_i <= ([MTU/(W*r_i)]*W*r + W*r + k*MTU)/B
54
55 In the worst case we have IntServ estimate with D = W*r+k*MTU
56 and C = MTU*r. The proof (if correct at all) is trivial.
57
58
59 --- It seems that cbq-2.0 is not very accurate. At least, I cannot
60 interpret some places, which look like wrong translations
61 from NS. Anyone is advised to find these differences
62 and explain to me, why I am wrong 8).
63
64 --- Linux has no EOI event, so that we cannot estimate true class
65 idle time. Workaround is to consider the next dequeue event
66 as sign that previous packet is finished. This is wrong because of
67 internal device queueing, but on a permanently loaded link it is true.
68 Moreover, combined with clock integrator, this scheme looks
69 very close to an ideal solution. */
70
71struct cbq_sched_data;
72
73
74struct cbq_class
75{
76 struct cbq_class *next; /* hash table link */
77 struct cbq_class *next_alive; /* next class with backlog in this priority band */
78
79/* Parameters */
80 u32 classid;
81 unsigned char priority; /* class priority */
82 unsigned char priority2; /* priority to be used after overlimit */
83 unsigned char ewma_log; /* time constant for idle time calculation */
84 unsigned char ovl_strategy;
c3bc7cff 85#ifdef CONFIG_NET_CLS_ACT
1da177e4
LT		 86 unsigned char police;
87#endif
88
89 u32 defmap;
90
91 /* Link-sharing scheduler parameters */
92 long maxidle; /* Class parameters: see below. */
93 long offtime;
94 long minidle;
95 u32 avpkt;
96 struct qdisc_rate_table *R_tab;
97
98 /* Overlimit strategy parameters */
99 void (*overlimit)(struct cbq_class *cl);
1a13cb63 100 psched_tdiff_t penalty;
1da177e4
LT		 101
102 /* General scheduler (WRR) parameters */
103 long allot;
104 long quantum; /* Allotment per WRR round */
105 long weight; /* Relative allotment: see below */
106
107 struct Qdisc *qdisc; /* Ptr to CBQ discipline */
108 struct cbq_class *split; /* Ptr to split node */
109 struct cbq_class *share; /* Ptr to LS parent in the class tree */
110 struct cbq_class *tparent; /* Ptr to tree parent in the class tree */
111 struct cbq_class *borrow; /* NULL if class is bandwidth limited;
112 parent otherwise */
113 struct cbq_class *sibling; /* Sibling chain */
114 struct cbq_class *children; /* Pointer to children chain */
115
116 struct Qdisc *q; /* Elementary queueing discipline */
117
118
119/* Variables */
120 unsigned char cpriority; /* Effective priority */
121 unsigned char delayed;
122 unsigned char level; /* level of the class in hierarchy:
123 0 for leaf classes, and maximal
124 level of children + 1 for nodes.
125 */
126
127 psched_time_t last; /* Last end of service */
128 psched_time_t undertime;
129 long avgidle;
130 long deficit; /* Saved deficit for WRR */
1a13cb63 131 psched_time_t penalized;
1da177e4
LT		 132 struct gnet_stats_basic bstats;
133 struct gnet_stats_queue qstats;
134 struct gnet_stats_rate_est rate_est;
1da177e4
LT		 135 struct tc_cbq_xstats xstats;
136
137 struct tcf_proto *filter_list;
138
139 int refcnt;
140 int filters;
141
142 struct cbq_class *defaults[TC_PRIO_MAX+1];
143};
144
145struct cbq_sched_data
146{
147 struct cbq_class *classes[16]; /* Hash table of all classes */
148 int nclasses[TC_CBQ_MAXPRIO+1];
149 unsigned quanta[TC_CBQ_MAXPRIO+1];
150
151 struct cbq_class link;
152
153 unsigned activemask;
154 struct cbq_class *active[TC_CBQ_MAXPRIO+1]; /* List of all classes
155 with backlog */
156
c3bc7cff 157#ifdef CONFIG_NET_CLS_ACT
1da177e4
LT		 158 struct cbq_class *rx_class;
159#endif
160 struct cbq_class *tx_class;
161 struct cbq_class *tx_borrowed;
162 int tx_len;
163 psched_time_t now; /* Cached timestamp */
164 psched_time_t now_rt; /* Cached real time */
165 unsigned pmask;
166
1a13cb63 167 struct hrtimer delay_timer;
88a99354 168 struct qdisc_watchdog watchdog; /* Watchdog timer,
1da177e4
LT		 169 started when CBQ has
170 backlog, but cannot
171 transmit just now */
88a99354 172 psched_tdiff_t wd_expires;
1da177e4
LT		 173 int toplevel;
174 u32 hgenerator;
175};
176
177
e9bef55d 178#define L2T(cl,len) qdisc_l2t((cl)->R_tab,len)
1da177e4
LT		 179
180
181static __inline__ unsigned cbq_hash(u32 h)
182{
183 h ^= h>>8;
184 h ^= h>>4;
185 return h&0xF;
186}
187
188static __inline__ struct cbq_class *
189cbq_class_lookup(struct cbq_sched_data *q, u32 classid)
190{
191 struct cbq_class *cl;
192
193 for (cl = q->classes[cbq_hash(classid)]; cl; cl = cl->next)
194 if (cl->classid == classid)
195 return cl;
196 return NULL;
197}
198
c3bc7cff 199#ifdef CONFIG_NET_CLS_ACT
1da177e4
LT		 200
201static struct cbq_class *
202cbq_reclassify(struct sk_buff *skb, struct cbq_class *this)
203{
204 struct cbq_class *cl, *new;
205
206 for (cl = this->tparent; cl; cl = cl->tparent)
207 if ((new = cl->defaults[TC_PRIO_BESTEFFORT]) != NULL && new != this)
208 return new;
209
210 return NULL;
211}
212
213#endif
214
215/* Classify packet. The procedure is pretty complicated, but
216 it allows us to combine link sharing and priority scheduling
217 transparently.
218
219 Namely, you can put link sharing rules (f.e. route based) at root of CBQ,
220 so that it resolves to split nodes. Then packets are classified
221 by logical priority, or a more specific classifier may be attached
222 to the split node.
223 */
224
225static struct cbq_class *
226cbq_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr)
227{
228 struct cbq_sched_data *q = qdisc_priv(sch);
229 struct cbq_class *head = &q->link;
230 struct cbq_class **defmap;
231 struct cbq_class *cl = NULL;
232 u32 prio = skb->priority;
233 struct tcf_result res;
234
235 /*
236 * Step 1. If skb->priority points to one of our classes, use it.
237 */
238 if (TC_H_MAJ(prio^sch->handle) == 0 &&
239 (cl = cbq_class_lookup(q, prio)) != NULL)
240 return cl;
241
29f1df6c 242 *qerr = NET_XMIT_BYPASS;
1da177e4
LT		 243 for (;;) {
244 int result = 0;
245 defmap = head->defaults;
246
247 /*
248 * Step 2+n. Apply classifier.
249 */
73ca4918
PM		 250 if (!head->filter_list ||
251 (result = tc_classify_compat(skb, head->filter_list, &res)) < 0)
1da177e4
LT		 252 goto fallback;
253
254 if ((cl = (void*)res.class) == NULL) {
255 if (TC_H_MAJ(res.classid))
256 cl = cbq_class_lookup(q, res.classid);
257 else if ((cl = defmap[res.classid&TC_PRIO_MAX]) == NULL)
258 cl = defmap[TC_PRIO_BESTEFFORT];
259
260 if (cl == NULL || cl->level >= head->level)
261 goto fallback;
262 }
263
264#ifdef CONFIG_NET_CLS_ACT
265 switch (result) {
266 case TC_ACT_QUEUED:
10297b99 267 case TC_ACT_STOLEN:
1da177e4
LT		 268 *qerr = NET_XMIT_SUCCESS;
269 case TC_ACT_SHOT:
270 return NULL;
73ca4918
PM		 271 case TC_ACT_RECLASSIFY:
272 return cbq_reclassify(skb, cl);
1da177e4 273 }
1da177e4
LT		 274#endif
275 if (cl->level == 0)
276 return cl;
277
278 /*
279 * Step 3+n. If classifier selected a link sharing class,
280 * apply agency specific classifier.
281 * Repeat this procdure until we hit a leaf node.
282 */
283 head = cl;
284 }
285
286fallback:
287 cl = head;
288
289 /*
290 * Step 4. No success...
291 */
292 if (TC_H_MAJ(prio) == 0 &&
293 !(cl = head->defaults[prio&TC_PRIO_MAX]) &&
294 !(cl = head->defaults[TC_PRIO_BESTEFFORT]))
295 return head;
296
297 return cl;
298}
299
300/*
301 A packet has just been enqueued on the empty class.
302 cbq_activate_class adds it to the tail of active class list
303 of its priority band.
304 */
305
306static __inline__ void cbq_activate_class(struct cbq_class *cl)
307{
308 struct cbq_sched_data *q = qdisc_priv(cl->qdisc);
309 int prio = cl->cpriority;
310 struct cbq_class *cl_tail;
311
312 cl_tail = q->active[prio];
313 q->active[prio] = cl;
314
315 if (cl_tail != NULL) {
316 cl->next_alive = cl_tail->next_alive;
317 cl_tail->next_alive = cl;
318 } else {
319 cl->next_alive = cl;
320 q->activemask |= (1<<prio);
321 }
322}
323
324/*
325 Unlink class from active chain.
326 Note that this same procedure is done directly in cbq_dequeue*
327 during round-robin procedure.
328 */
329
330static void cbq_deactivate_class(struct cbq_class *this)
331{
332 struct cbq_sched_data *q = qdisc_priv(this->qdisc);
333 int prio = this->cpriority;
334 struct cbq_class *cl;
335 struct cbq_class *cl_prev = q->active[prio];
336
337 do {
338 cl = cl_prev->next_alive;
339 if (cl == this) {
340 cl_prev->next_alive = cl->next_alive;
341 cl->next_alive = NULL;
342
343 if (cl == q->active[prio]) {
344 q->active[prio] = cl_prev;
345 if (cl == q->active[prio]) {
346 q->active[prio] = NULL;
347 q->activemask &= ~(1<<prio);
348 return;
349 }
350 }
1da177e4
LT		 351 return;
352 }
353 } while ((cl_prev = cl) != q->active[prio]);
354}
355
356static void
357cbq_mark_toplevel(struct cbq_sched_data *q, struct cbq_class *cl)
358{
359 int toplevel = q->toplevel;
360
361 if (toplevel > cl->level && !(cl->q->flags&TCQ_F_THROTTLED)) {
362 psched_time_t now;
363 psched_tdiff_t incr;
364
3bebcda2 365 now = psched_get_time();
8edc0c31 366 incr = now - q->now_rt;
7c59e25f 367 now = q->now + incr;
1da177e4
LT		 368
369 do {
104e0878 370 if (cl->undertime < now) {
1da177e4
LT		 371 q->toplevel = cl->level;
372 return;
373 }
374 } while ((cl=cl->borrow) != NULL && toplevel > cl->level);
375 }
376}
377
378static int
379cbq_enqueue(struct sk_buff *skb, struct Qdisc *sch)
380{
381 struct cbq_sched_data *q = qdisc_priv(sch);
382 int len = skb->len;
ddeee3ce 383 int uninitialized_var(ret);
1da177e4
LT		 384 struct cbq_class *cl = cbq_classify(skb, sch, &ret);
385
c3bc7cff 386#ifdef CONFIG_NET_CLS_ACT
1da177e4
LT		 387 q->rx_class = cl;
388#endif
389 if (cl == NULL) {
29f1df6c 390 if (ret == NET_XMIT_BYPASS)
1da177e4
LT		 391 sch->qstats.drops++;
392 kfree_skb(skb);
393 return ret;
394 }
395
c3bc7cff 396#ifdef CONFIG_NET_CLS_ACT
1da177e4
LT		 397 cl->q->__parent = sch;
398#endif
399 if ((ret = cl->q->enqueue(skb, cl->q)) == NET_XMIT_SUCCESS) {
400 sch->q.qlen++;
401 sch->bstats.packets++;
402 sch->bstats.bytes+=len;
403 cbq_mark_toplevel(q, cl);
404 if (!cl->next_alive)
405 cbq_activate_class(cl);
406 return ret;
407 }
408
409 sch->qstats.drops++;
410 cbq_mark_toplevel(q, cl);
411 cl->qstats.drops++;
412 return ret;
413}
414
415static int
416cbq_requeue(struct sk_buff *skb, struct Qdisc *sch)
417{
418 struct cbq_sched_data *q = qdisc_priv(sch);
419 struct cbq_class *cl;
420 int ret;
421
422 if ((cl = q->tx_class) == NULL) {
423 kfree_skb(skb);
424 sch->qstats.drops++;
425 return NET_XMIT_CN;
426 }
427 q->tx_class = NULL;
428
429 cbq_mark_toplevel(q, cl);
430
c3bc7cff 431#ifdef CONFIG_NET_CLS_ACT
1da177e4
LT		 432 q->rx_class = cl;
433 cl->q->__parent = sch;
434#endif
435 if ((ret = cl->q->ops->requeue(skb, cl->q)) == 0) {
436 sch->q.qlen++;
437 sch->qstats.requeues++;
438 if (!cl->next_alive)
439 cbq_activate_class(cl);
440 return 0;
441 }
442 sch->qstats.drops++;
443 cl->qstats.drops++;
444 return ret;
445}
446
447/* Overlimit actions */
448
449/* TC_CBQ_OVL_CLASSIC: (default) penalize leaf class by adding offtime */
450
451static void cbq_ovl_classic(struct cbq_class *cl)
452{
453 struct cbq_sched_data *q = qdisc_priv(cl->qdisc);
8edc0c31 454 psched_tdiff_t delay = cl->undertime - q->now;
1da177e4
LT		 455
456 if (!cl->delayed) {
457 delay += cl->offtime;
458
10297b99 459 /*
1da177e4
LT		 460 Class goes to sleep, so that it will have no
461 chance to work avgidle. Let's forgive it 8)
462
463 BTW cbq-2.0 has a crap in this
464 place, apparently they forgot to shift it by cl->ewma_log.
465 */
466 if (cl->avgidle < 0)
467 delay -= (-cl->avgidle) - ((-cl->avgidle) >> cl->ewma_log);
468 if (cl->avgidle < cl->minidle)
469 cl->avgidle = cl->minidle;
470 if (delay <= 0)
471 delay = 1;
7c59e25f 472 cl->undertime = q->now + delay;
1da177e4
LT		 473
474 cl->xstats.overactions++;
475 cl->delayed = 1;
476 }
477 if (q->wd_expires == 0 || q->wd_expires > delay)
478 q->wd_expires = delay;
479
480 /* Dirty work! We must schedule wakeups based on
481 real available rate, rather than leaf rate,
482 which may be tiny (even zero).
483 */
484 if (q->toplevel == TC_CBQ_MAXLEVEL) {
485 struct cbq_class *b;
486 psched_tdiff_t base_delay = q->wd_expires;
487
488 for (b = cl->borrow; b; b = b->borrow) {
8edc0c31 489 delay = b->undertime - q->now;
1da177e4
LT		 490 if (delay < base_delay) {
491 if (delay <= 0)
492 delay = 1;
493 base_delay = delay;
494 }
495 }
496
497 q->wd_expires = base_delay;
498 }
499}
500
501/* TC_CBQ_OVL_RCLASSIC: penalize by offtime classes in hierarchy, when
502 they go overlimit
503 */
504
505static void cbq_ovl_rclassic(struct cbq_class *cl)
506{
507 struct cbq_sched_data *q = qdisc_priv(cl->qdisc);
508 struct cbq_class *this = cl;
509
510 do {
511 if (cl->level > q->toplevel) {
512 cl = NULL;
513 break;
514 }
515 } while ((cl = cl->borrow) != NULL);
516
517 if (cl == NULL)
518 cl = this;
519 cbq_ovl_classic(cl);
520}
521
522/* TC_CBQ_OVL_DELAY: delay until it will go to underlimit */
523
524static void cbq_ovl_delay(struct cbq_class *cl)
525{
526 struct cbq_sched_data *q = qdisc_priv(cl->qdisc);
8edc0c31 527 psched_tdiff_t delay = cl->undertime - q->now;
1da177e4
LT		 528
529 if (!cl->delayed) {
1a13cb63
PM		 530 psched_time_t sched = q->now;
531 ktime_t expires;
1da177e4
LT		 532
533 delay += cl->offtime;
534 if (cl->avgidle < 0)
535 delay -= (-cl->avgidle) - ((-cl->avgidle) >> cl->ewma_log);
536 if (cl->avgidle < cl->minidle)
537 cl->avgidle = cl->minidle;
7c59e25f 538 cl->undertime = q->now + delay;
1da177e4
LT		 539
540 if (delay > 0) {
1a13cb63 541 sched += delay + cl->penalty;
1da177e4
LT		 542 cl->penalized = sched;
543 cl->cpriority = TC_CBQ_MAXPRIO;
544 q->pmask |= (1<<TC_CBQ_MAXPRIO);
1a13cb63
PM		 545
546 expires = ktime_set(0, 0);
547 expires = ktime_add_ns(expires, PSCHED_US2NS(sched));
548 if (hrtimer_try_to_cancel(&q->delay_timer) &&
549 ktime_to_ns(ktime_sub(q->delay_timer.expires,
550 expires)) > 0)
551 q->delay_timer.expires = expires;
552 hrtimer_restart(&q->delay_timer);
1da177e4
LT		 553 cl->delayed = 1;
554 cl->xstats.overactions++;
555 return;
556 }
557 delay = 1;
558 }
559 if (q->wd_expires == 0 || q->wd_expires > delay)
560 q->wd_expires = delay;
561}
562
563/* TC_CBQ_OVL_LOWPRIO: penalize class by lowering its priority band */
564
565static void cbq_ovl_lowprio(struct cbq_class *cl)
566{
567 struct cbq_sched_data *q = qdisc_priv(cl->qdisc);
568
1a13cb63 569 cl->penalized = q->now + cl->penalty;
1da177e4
LT		 570
571 if (cl->cpriority != cl->priority2) {
572 cl->cpriority = cl->priority2;
573 q->pmask |= (1<<cl->cpriority);
574 cl->xstats.overactions++;
575 }
576 cbq_ovl_classic(cl);
577}
578
579/* TC_CBQ_OVL_DROP: penalize class by dropping */
580
581static void cbq_ovl_drop(struct cbq_class *cl)
582{
583 if (cl->q->ops->drop)
584 if (cl->q->ops->drop(cl->q))
585 cl->qdisc->q.qlen--;
586 cl->xstats.overactions++;
587 cbq_ovl_classic(cl);
588}
589
1a13cb63
PM		 590static psched_tdiff_t cbq_undelay_prio(struct cbq_sched_data *q, int prio,
591 psched_time_t now)
1da177e4
LT		 592{
593 struct cbq_class *cl;
594 struct cbq_class *cl_prev = q->active[prio];
1a13cb63 595 psched_time_t sched = now;
1da177e4
LT		 596
597 if (cl_prev == NULL)
e9054a33 598 return 0;
1da177e4
LT		 599
600 do {
601 cl = cl_prev->next_alive;
1a13cb63 602 if (now - cl->penalized > 0) {
1da177e4
LT		 603 cl_prev->next_alive = cl->next_alive;
604 cl->next_alive = NULL;
605 cl->cpriority = cl->priority;
606 cl->delayed = 0;
607 cbq_activate_class(cl);
608
609 if (cl == q->active[prio]) {
610 q->active[prio] = cl_prev;
611 if (cl == q->active[prio]) {
612 q->active[prio] = NULL;
613 return 0;
614 }
615 }
616
617 cl = cl_prev->next_alive;
1a13cb63 618 } else if (sched - cl->penalized > 0)
1da177e4
LT		 619 sched = cl->penalized;
620 } while ((cl_prev = cl) != q->active[prio]);
621
1a13cb63 622 return sched - now;
1da177e4
LT		 623}
624
1a13cb63 625static enum hrtimer_restart cbq_undelay(struct hrtimer *timer)
1da177e4 626{
1a13cb63
PM		 627 struct cbq_sched_data *q = container_of(timer, struct cbq_sched_data,
628 delay_timer);
629 struct Qdisc *sch = q->watchdog.qdisc;
630 psched_time_t now;
631 psched_tdiff_t delay = 0;
1da177e4
LT		 632 unsigned pmask;
633
3bebcda2 634 now = psched_get_time();
1a13cb63 635
1da177e4
LT		 636 pmask = q->pmask;
637 q->pmask = 0;
638
639 while (pmask) {
640 int prio = ffz(~pmask);
1a13cb63 641 psched_tdiff_t tmp;
1da177e4
LT		 642
643 pmask &= ~(1<<prio);
644
1a13cb63 645 tmp = cbq_undelay_prio(q, prio, now);
1da177e4
LT		 646 if (tmp > 0) {
647 q->pmask |= 1<<prio;
648 if (tmp < delay || delay == 0)
649 delay = tmp;
650 }
651 }
652
653 if (delay) {
1a13cb63
PM		 654 ktime_t time;
655
656 time = ktime_set(0, 0);
657 time = ktime_add_ns(time, PSCHED_US2NS(now + delay));
658 hrtimer_start(&q->delay_timer, time, HRTIMER_MODE_ABS);
1da177e4
LT		 659 }
660
661 sch->flags &= ~TCQ_F_THROTTLED;
662 netif_schedule(sch->dev);
1a13cb63 663 return HRTIMER_NORESTART;
1da177e4
LT		 664}
665
c3bc7cff 666#ifdef CONFIG_NET_CLS_ACT
1da177e4
LT		 667static int cbq_reshape_fail(struct sk_buff *skb, struct Qdisc *child)
668{
669 int len = skb->len;
670 struct Qdisc *sch = child->__parent;
671 struct cbq_sched_data *q = qdisc_priv(sch);
672 struct cbq_class *cl = q->rx_class;
673
674 q->rx_class = NULL;
675
676 if (cl && (cl = cbq_reclassify(skb, cl)) != NULL) {
677
678 cbq_mark_toplevel(q, cl);
679
680 q->rx_class = cl;
681 cl->q->__parent = sch;
682
683 if (cl->q->enqueue(skb, cl->q) == 0) {
684 sch->q.qlen++;
685 sch->bstats.packets++;
686 sch->bstats.bytes+=len;
687 if (!cl->next_alive)
688 cbq_activate_class(cl);
689 return 0;
690 }
691 sch->qstats.drops++;
692 return 0;
693 }
694
695 sch->qstats.drops++;
696 return -1;
697}
698#endif
699
10297b99 700/*
1da177e4
LT		 701 It is mission critical procedure.
702
703 We "regenerate" toplevel cutoff, if transmitting class
704 has backlog and it is not regulated. It is not part of
705 original CBQ description, but looks more reasonable.
706 Probably, it is wrong. This question needs further investigation.
707*/
708
709static __inline__ void
710cbq_update_toplevel(struct cbq_sched_data *q, struct cbq_class *cl,
711 struct cbq_class *borrowed)
712{
713 if (cl && q->toplevel >= borrowed->level) {
714 if (cl->q->q.qlen > 1) {
715 do {
a084980d 716 if (borrowed->undertime == PSCHED_PASTPERFECT) {
1da177e4
LT		 717 q->toplevel = borrowed->level;
718 return;
719 }
720 } while ((borrowed=borrowed->borrow) != NULL);
721 }
10297b99 722#if 0
1da177e4
LT		 723 /* It is not necessary now. Uncommenting it
724 will save CPU cycles, but decrease fairness.
725 */
726 q->toplevel = TC_CBQ_MAXLEVEL;
727#endif
728 }
729}
730
731static void
732cbq_update(struct cbq_sched_data *q)
733{
734 struct cbq_class *this = q->tx_class;
735 struct cbq_class *cl = this;
736 int len = q->tx_len;
737
738 q->tx_class = NULL;
739
740 for ( ; cl; cl = cl->share) {
741 long avgidle = cl->avgidle;
742 long idle;
743
744 cl->bstats.packets++;
745 cl->bstats.bytes += len;
746
747 /*
748 (now - last) is total time between packet right edges.
749 (last_pktlen/rate) is "virtual" busy time, so that
750
10297b99 751 idle = (now - last) - last_pktlen/rate
1da177e4
LT		 752 */
753
8edc0c31 754 idle = q->now - cl->last;
1da177e4
LT		 755 if ((unsigned long)idle > 128*1024*1024) {
756 avgidle = cl->maxidle;
757 } else {
758 idle -= L2T(cl, len);
759
760 /* true_avgidle := (1-W)*true_avgidle + W*idle,
761 where W=2^{-ewma_log}. But cl->avgidle is scaled:
762 cl->avgidle == true_avgidle/W,
763 hence:
764 */
765 avgidle += idle - (avgidle>>cl->ewma_log);
766 }
767
768 if (avgidle <= 0) {
769 /* Overlimit or at-limit */
770
771 if (avgidle < cl->minidle)
772 avgidle = cl->minidle;
773
774 cl->avgidle = avgidle;
775
776 /* Calculate expected time, when this class
777 will be allowed to send.
778 It will occur, when:
779 (1-W)*true_avgidle + W*delay = 0, i.e.
780 idle = (1/W - 1)*(-true_avgidle)
781 or
782 idle = (1 - W)*(-cl->avgidle);
783 */
784 idle = (-avgidle) - ((-avgidle) >> cl->ewma_log);
785
786 /*
787 That is not all.
788 To maintain the rate allocated to the class,
789 we add to undertime virtual clock,
790 necessary to complete transmitted packet.
791 (len/phys_bandwidth has been already passed
792 to the moment of cbq_update)
793 */
794
795 idle -= L2T(&q->link, len);
796 idle += L2T(cl, len);
797
7c59e25f 798 cl->undertime = q->now + idle;
1da177e4
LT		 799 } else {
800 /* Underlimit */
801
a084980d 802 cl->undertime = PSCHED_PASTPERFECT;
1da177e4
LT		 803 if (avgidle > cl->maxidle)
804 cl->avgidle = cl->maxidle;
805 else
806 cl->avgidle = avgidle;
807 }
808 cl->last = q->now;
809 }
810
811 cbq_update_toplevel(q, this, q->tx_borrowed);
812}
813
814static __inline__ struct cbq_class *
815cbq_under_limit(struct cbq_class *cl)
816{
817 struct cbq_sched_data *q = qdisc_priv(cl->qdisc);
818 struct cbq_class *this_cl = cl;
819
820 if (cl->tparent == NULL)
821 return cl;
822
a084980d 823 if (cl->undertime == PSCHED_PASTPERFECT || q->now >= cl->undertime) {
1da177e4
LT		 824 cl->delayed = 0;
825 return cl;
826 }
827
828 do {
829 /* It is very suspicious place. Now overlimit
830 action is generated for not bounded classes
831 only if link is completely congested.
832 Though it is in agree with ancestor-only paradigm,
833 it looks very stupid. Particularly,
834 it means that this chunk of code will either
835 never be called or result in strong amplification
836 of burstiness. Dangerous, silly, and, however,
837 no another solution exists.
838 */
839 if ((cl = cl->borrow) == NULL) {
840 this_cl->qstats.overlimits++;
841 this_cl->overlimit(this_cl);
842 return NULL;
843 }
844 if (cl->level > q->toplevel)
845 return NULL;
a084980d 846 } while (cl->undertime != PSCHED_PASTPERFECT && q->now < cl->undertime);
1da177e4
LT		 847
848 cl->delayed = 0;
849 return cl;
850}
851
852static __inline__ struct sk_buff *
853cbq_dequeue_prio(struct Qdisc *sch, int prio)
854{
855 struct cbq_sched_data *q = qdisc_priv(sch);
856 struct cbq_class *cl_tail, *cl_prev, *cl;
857 struct sk_buff *skb;
858 int deficit;
859
860 cl_tail = cl_prev = q->active[prio];
861 cl = cl_prev->next_alive;
862
863 do {
864 deficit = 0;
865
866 /* Start round */
867 do {
868 struct cbq_class *borrow = cl;
869
870 if (cl->q->q.qlen &&
871 (borrow = cbq_under_limit(cl)) == NULL)
872 goto skip_class;
873
874 if (cl->deficit <= 0) {
875 /* Class exhausted its allotment per
876 this round. Switch to the next one.
877 */
878 deficit = 1;
879 cl->deficit += cl->quantum;
880 goto next_class;
881 }
882
883 skb = cl->q->dequeue(cl->q);
884
885 /* Class did not give us any skb :-(
10297b99 886 It could occur even if cl->q->q.qlen != 0
1da177e4
LT		 887 f.e. if cl->q == "tbf"
888 */
889 if (skb == NULL)
890 goto skip_class;
891
892 cl->deficit -= skb->len;
893 q->tx_class = cl;
894 q->tx_borrowed = borrow;
895 if (borrow != cl) {
896#ifndef CBQ_XSTATS_BORROWS_BYTES
897 borrow->xstats.borrows++;
898 cl->xstats.borrows++;
899#else
900 borrow->xstats.borrows += skb->len;
901 cl->xstats.borrows += skb->len;
902#endif
903 }
904 q->tx_len = skb->len;
905
906 if (cl->deficit <= 0) {
907 q->active[prio] = cl;
908 cl = cl->next_alive;
909 cl->deficit += cl->quantum;
910 }
911 return skb;
912
913skip_class:
914 if (cl->q->q.qlen == 0 || prio != cl->cpriority) {
915 /* Class is empty or penalized.
916 Unlink it from active chain.
917 */
918 cl_prev->next_alive = cl->next_alive;
919 cl->next_alive = NULL;
920
921 /* Did cl_tail point to it? */
922 if (cl == cl_tail) {
923 /* Repair it! */
924 cl_tail = cl_prev;
925
926 /* Was it the last class in this band? */
927 if (cl == cl_tail) {
928 /* Kill the band! */
929 q->active[prio] = NULL;
930 q->activemask &= ~(1<<prio);
931 if (cl->q->q.qlen)
932 cbq_activate_class(cl);
933 return NULL;
934 }
935
936 q->active[prio] = cl_tail;
937 }
938 if (cl->q->q.qlen)
939 cbq_activate_class(cl);
940
941 cl = cl_prev;
942 }
943
944next_class:
945 cl_prev = cl;
946 cl = cl->next_alive;
947 } while (cl_prev != cl_tail);
948 } while (deficit);
949
950 q->active[prio] = cl_prev;
951
952 return NULL;
953}
954
955static __inline__ struct sk_buff *
956cbq_dequeue_1(struct Qdisc *sch)
957{
958 struct cbq_sched_data *q = qdisc_priv(sch);
959 struct sk_buff *skb;
960 unsigned activemask;
961
962 activemask = q->activemask&0xFF;
963 while (activemask) {
964 int prio = ffz(~activemask);
965 activemask &= ~(1<<prio);
966 skb = cbq_dequeue_prio(sch, prio);
967 if (skb)
968 return skb;
969 }
970 return NULL;
971}
972
973static struct sk_buff *
974cbq_dequeue(struct Qdisc *sch)
975{
976 struct sk_buff *skb;
977 struct cbq_sched_data *q = qdisc_priv(sch);
978 psched_time_t now;
979 psched_tdiff_t incr;
980
3bebcda2 981 now = psched_get_time();
8edc0c31 982 incr = now - q->now_rt;
1da177e4
LT		 983
984 if (q->tx_class) {
985 psched_tdiff_t incr2;
986 /* Time integrator. We calculate EOS time
987 by adding expected packet transmission time.
988 If real time is greater, we warp artificial clock,
989 so that:
990
991 cbq_time = max(real_time, work);
992 */
993 incr2 = L2T(&q->link, q->tx_len);
7c59e25f 994 q->now += incr2;
1da177e4
LT		 995 cbq_update(q);
996 if ((incr -= incr2) < 0)
997 incr = 0;
998 }
7c59e25f 999 q->now += incr;
1da177e4
LT		 1000 q->now_rt = now;
1001
1002 for (;;) {
1003 q->wd_expires = 0;
1004
1005 skb = cbq_dequeue_1(sch);
1006 if (skb) {
1007 sch->q.qlen--;
1008 sch->flags &= ~TCQ_F_THROTTLED;
1009 return skb;
1010 }
1011
1012 /* All the classes are overlimit.
1013
1014 It is possible, if:
1015
1016 1. Scheduler is empty.
1017 2. Toplevel cutoff inhibited borrowing.
1018 3. Root class is overlimit.
1019
1020 Reset 2d and 3d conditions and retry.
1021
1022 Note, that NS and cbq-2.0 are buggy, peeking
1023 an arbitrary class is appropriate for ancestor-only
1024 sharing, but not for toplevel algorithm.
1025
1026 Our version is better, but slower, because it requires
1027 two passes, but it is unavoidable with top-level sharing.
1028 */
1029
1030 if (q->toplevel == TC_CBQ_MAXLEVEL &&
a084980d 1031 q->link.undertime == PSCHED_PASTPERFECT)
1da177e4
LT		 1032 break;
1033
1034 q->toplevel = TC_CBQ_MAXLEVEL;
a084980d 1035 q->link.undertime = PSCHED_PASTPERFECT;
1da177e4
LT		 1036 }
1037
1038 /* No packets in scheduler or nobody wants to give them to us :-(
1039 Sigh... start watchdog timer in the last case. */
1040
1041 if (sch->q.qlen) {
1042 sch->qstats.overlimits++;
88a99354
PM		 1043 if (q->wd_expires)
1044 qdisc_watchdog_schedule(&q->watchdog,
bb239acf 1045 now + q->wd_expires);
1da177e4
LT		 1046 }
1047 return NULL;
1048}
1049
1050/* CBQ class maintanance routines */
1051
1052static void cbq_adjust_levels(struct cbq_class *this)
1053{
1054 if (this == NULL)
1055 return;
1056
1057 do {
1058 int level = 0;
1059 struct cbq_class *cl;
1060
1061 if ((cl = this->children) != NULL) {
1062 do {
1063 if (cl->level > level)
1064 level = cl->level;
1065 } while ((cl = cl->sibling) != this->children);
1066 }
1067 this->level = level+1;
1068 } while ((this = this->tparent) != NULL);
1069}
1070
1071static void cbq_normalize_quanta(struct cbq_sched_data *q, int prio)
1072{
1073 struct cbq_class *cl;
1074 unsigned h;
1075
1076 if (q->quanta[prio] == 0)
1077 return;
1078
1079 for (h=0; h<16; h++) {
1080 for (cl = q->classes[h]; cl; cl = cl->next) {
1081 /* BUGGGG... Beware! This expression suffer of
1082 arithmetic overflows!
1083 */
1084 if (cl->priority == prio) {
1085 cl->quantum = (cl->weight*cl->allot*q->nclasses[prio])/
1086 q->quanta[prio];
1087 }
1088 if (cl->quantum <= 0 || cl->quantum>32*cl->qdisc->dev->mtu) {
1089 printk(KERN_WARNING "CBQ: class %08x has bad quantum==%ld, repaired.\n", cl->classid, cl->quantum);
1090 cl->quantum = cl->qdisc->dev->mtu/2 + 1;
1091 }
1092 }
1093 }
1094}
1095
1096static void cbq_sync_defmap(struct cbq_class *cl)
1097{
1098 struct cbq_sched_data *q = qdisc_priv(cl->qdisc);
1099 struct cbq_class *split = cl->split;
1100 unsigned h;
1101 int i;
1102
1103 if (split == NULL)
1104 return;
1105
1106 for (i=0; i<=TC_PRIO_MAX; i++) {
1107 if (split->defaults[i] == cl && !(cl->defmap&(1<<i)))
1108 split->defaults[i] = NULL;
1109 }
1110
1111 for (i=0; i<=TC_PRIO_MAX; i++) {
1112 int level = split->level;
1113
1114 if (split->defaults[i])
1115 continue;
1116
1117 for (h=0; h<16; h++) {
1118 struct cbq_class *c;
1119
1120 for (c = q->classes[h]; c; c = c->next) {
1121 if (c->split == split && c->level < level &&
1122 c->defmap&(1<<i)) {
1123 split->defaults[i] = c;
1124 level = c->level;
1125 }
1126 }
1127 }
1128 }
1129}
1130
1131static void cbq_change_defmap(struct cbq_class *cl, u32 splitid, u32 def, u32 mask)
1132{
1133 struct cbq_class *split = NULL;
1134
1135 if (splitid == 0) {
1136 if ((split = cl->split) == NULL)
1137 return;
1138 splitid = split->classid;
1139 }
1140
1141 if (split == NULL || split->classid != splitid) {
1142 for (split = cl->tparent; split; split = split->tparent)
1143 if (split->classid == splitid)
1144 break;
1145 }
1146
1147 if (split == NULL)
1148 return;
1149
1150 if (cl->split != split) {
1151 cl->defmap = 0;
1152 cbq_sync_defmap(cl);
1153 cl->split = split;
1154 cl->defmap = def&mask;
1155 } else
1156 cl->defmap = (cl->defmap&~mask)|(def&mask);
1157
1158 cbq_sync_defmap(cl);
1159}
1160
1161static void cbq_unlink_class(struct cbq_class *this)
1162{
1163 struct cbq_class *cl, **clp;
1164 struct cbq_sched_data *q = qdisc_priv(this->qdisc);
1165
1166 for (clp = &q->classes[cbq_hash(this->classid)]; (cl = *clp) != NULL; clp = &cl->next) {
1167 if (cl == this) {
1168 *clp = cl->next;
1169 cl->next = NULL;
1170 break;
1171 }
1172 }
1173
1174 if (this->tparent) {
1175 clp=&this->sibling;
1176 cl = *clp;
1177 do {
1178 if (cl == this) {
1179 *clp = cl->sibling;
1180 break;
1181 }
1182 clp = &cl->sibling;
1183 } while ((cl = *clp) != this->sibling);
1184
1185 if (this->tparent->children == this) {
1186 this->tparent->children = this->sibling;
1187 if (this->sibling == this)
1188 this->tparent->children = NULL;
1189 }
1190 } else {
1191 BUG_TRAP(this->sibling == this);
1192 }
1193}
1194
1195static void cbq_link_class(struct cbq_class *this)
1196{
1197 struct cbq_sched_data *q = qdisc_priv(this->qdisc);
1198 unsigned h = cbq_hash(this->classid);
1199 struct cbq_class *parent = this->tparent;
1200
1201 this->sibling = this;
1202 this->next = q->classes[h];
1203 q->classes[h] = this;
1204
1205 if (parent == NULL)
1206 return;
1207
1208 if (parent->children == NULL) {
1209 parent->children = this;
1210 } else {
1211 this->sibling = parent->children->sibling;
1212 parent->children->sibling = this;
1213 }
1214}
1215
1216static unsigned int cbq_drop(struct Qdisc* sch)
1217{
1218 struct cbq_sched_data *q = qdisc_priv(sch);
1219 struct cbq_class *cl, *cl_head;
1220 int prio;
1221 unsigned int len;
1222
1223 for (prio = TC_CBQ_MAXPRIO; prio >= 0; prio--) {
1224 if ((cl_head = q->active[prio]) == NULL)
1225 continue;
1226
1227 cl = cl_head;
1228 do {
1229 if (cl->q->ops->drop && (len = cl->q->ops->drop(cl->q))) {
1230 sch->q.qlen--;
a37ef2e3
JP		 1231 if (!cl->q->q.qlen)
1232 cbq_deactivate_class(cl);
1da177e4
LT		 1233 return len;
1234 }
1235 } while ((cl = cl->next_alive) != cl_head);
1236 }
1237 return 0;
1238}
1239
1240static void
1241cbq_reset(struct Qdisc* sch)
1242{
1243 struct cbq_sched_data *q = qdisc_priv(sch);
1244 struct cbq_class *cl;
1245 int prio;
1246 unsigned h;
1247
1248 q->activemask = 0;
1249 q->pmask = 0;
1250 q->tx_class = NULL;
1251 q->tx_borrowed = NULL;
88a99354 1252 qdisc_watchdog_cancel(&q->watchdog);
1a13cb63 1253 hrtimer_cancel(&q->delay_timer);
1da177e4 1254 q->toplevel = TC_CBQ_MAXLEVEL;
3bebcda2 1255 q->now = psched_get_time();
1da177e4
LT		 1256 q->now_rt = q->now;
1257
1258 for (prio = 0; prio <= TC_CBQ_MAXPRIO; prio++)
1259 q->active[prio] = NULL;
1260
1261 for (h = 0; h < 16; h++) {
1262 for (cl = q->classes[h]; cl; cl = cl->next) {
1263 qdisc_reset(cl->q);
1264
1265 cl->next_alive = NULL;
a084980d 1266 cl->undertime = PSCHED_PASTPERFECT;
1da177e4
LT		 1267 cl->avgidle = cl->maxidle;
1268 cl->deficit = cl->quantum;
1269 cl->cpriority = cl->priority;
1270 }
1271 }
1272 sch->q.qlen = 0;
1273}
1274
1275
1276static int cbq_set_lss(struct cbq_class *cl, struct tc_cbq_lssopt *lss)
1277{
1278 if (lss->change&TCF_CBQ_LSS_FLAGS) {
1279 cl->share = (lss->flags&TCF_CBQ_LSS_ISOLATED) ? NULL : cl->tparent;
1280 cl->borrow = (lss->flags&TCF_CBQ_LSS_BOUNDED) ? NULL : cl->tparent;
1281 }
1282 if (lss->change&TCF_CBQ_LSS_EWMA)
1283 cl->ewma_log = lss->ewma_log;
1284 if (lss->change&TCF_CBQ_LSS_AVPKT)
1285 cl->avpkt = lss->avpkt;
1286 if (lss->change&TCF_CBQ_LSS_MINIDLE)
1287 cl->minidle = -(long)lss->minidle;
1288 if (lss->change&TCF_CBQ_LSS_MAXIDLE) {
1289 cl->maxidle = lss->maxidle;
1290 cl->avgidle = lss->maxidle;
1291 }
1292 if (lss->change&TCF_CBQ_LSS_OFFTIME)
1293 cl->offtime = lss->offtime;
1294 return 0;
1295}
1296
1297static void cbq_rmprio(struct cbq_sched_data *q, struct cbq_class *cl)
1298{
1299 q->nclasses[cl->priority]--;
1300 q->quanta[cl->priority] -= cl->weight;
1301 cbq_normalize_quanta(q, cl->priority);
1302}
1303
1304static void cbq_addprio(struct cbq_sched_data *q, struct cbq_class *cl)
1305{
1306 q->nclasses[cl->priority]++;
1307 q->quanta[cl->priority] += cl->weight;
1308 cbq_normalize_quanta(q, cl->priority);
1309}
1310
1311static int cbq_set_wrr(struct cbq_class *cl, struct tc_cbq_wrropt *wrr)
1312{
1313 struct cbq_sched_data *q = qdisc_priv(cl->qdisc);
1314
1315 if (wrr->allot)
1316 cl->allot = wrr->allot;
1317 if (wrr->weight)
1318 cl->weight = wrr->weight;
1319 if (wrr->priority) {
1320 cl->priority = wrr->priority-1;
1321 cl->cpriority = cl->priority;
1322 if (cl->priority >= cl->priority2)
1323 cl->priority2 = TC_CBQ_MAXPRIO-1;
1324 }
1325
1326 cbq_addprio(q, cl);
1327 return 0;
1328}
1329
1330static int cbq_set_overlimit(struct cbq_class *cl, struct tc_cbq_ovl *ovl)
1331{
1332 switch (ovl->strategy) {
1333 case TC_CBQ_OVL_CLASSIC:
1334 cl->overlimit = cbq_ovl_classic;
1335 break;
1336 case TC_CBQ_OVL_DELAY:
1337 cl->overlimit = cbq_ovl_delay;
1338 break;
1339 case TC_CBQ_OVL_LOWPRIO:
1340 if (ovl->priority2-1 >= TC_CBQ_MAXPRIO ||
1341 ovl->priority2-1 <= cl->priority)
1342 return -EINVAL;
1343 cl->priority2 = ovl->priority2-1;
1344 cl->overlimit = cbq_ovl_lowprio;
1345 break;
1346 case TC_CBQ_OVL_DROP:
1347 cl->overlimit = cbq_ovl_drop;
1348 break;
1349 case TC_CBQ_OVL_RCLASSIC:
1350 cl->overlimit = cbq_ovl_rclassic;
1351 break;
1352 default:
1353 return -EINVAL;
1354 }
1a13cb63 1355 cl->penalty = ovl->penalty;
1da177e4
LT		 1356 return 0;
1357}
1358
c3bc7cff 1359#ifdef CONFIG_NET_CLS_ACT
1da177e4
LT		 1360static int cbq_set_police(struct cbq_class *cl, struct tc_cbq_police *p)
1361{
1362 cl->police = p->police;
1363
1364 if (cl->q->handle) {
1365 if (p->police == TC_POLICE_RECLASSIFY)
1366 cl->q->reshape_fail = cbq_reshape_fail;
1367 else
1368 cl->q->reshape_fail = NULL;
1369 }
1370 return 0;
1371}
1372#endif
1373
1374static int cbq_set_fopt(struct cbq_class *cl, struct tc_cbq_fopt *fopt)
1375{
1376 cbq_change_defmap(cl, fopt->split, fopt->defmap, fopt->defchange);
1377 return 0;
1378}
1379
27a3421e
PM		 1380static const struct nla_policy cbq_policy[TCA_CBQ_MAX + 1] = {
1381 [TCA_CBQ_LSSOPT] = { .len = sizeof(struct tc_cbq_lssopt) },
1382 [TCA_CBQ_WRROPT] = { .len = sizeof(struct tc_cbq_wrropt) },
1383 [TCA_CBQ_FOPT] = { .len = sizeof(struct tc_cbq_fopt) },
1384 [TCA_CBQ_OVL_STRATEGY] = { .len = sizeof(struct tc_cbq_ovl) },
1385 [TCA_CBQ_RATE] = { .len = sizeof(struct tc_ratespec) },
1386 [TCA_CBQ_RTAB] = { .type = NLA_BINARY, .len = TC_RTAB_SIZE },
1387 [TCA_CBQ_POLICE] = { .len = sizeof(struct tc_cbq_police) },
1388};
1389
1e90474c 1390static int cbq_init(struct Qdisc *sch, struct nlattr *opt)
1da177e4
LT		 1391{
1392 struct cbq_sched_data *q = qdisc_priv(sch);
1e90474c 1393 struct nlattr *tb[TCA_CBQ_MAX + 1];
1da177e4 1394 struct tc_ratespec *r;
cee63723
PM		 1395 int err;
1396
27a3421e 1397 err = nla_parse_nested(tb, TCA_CBQ_MAX, opt, cbq_policy);
cee63723
PM		 1398 if (err < 0)
1399 return err;
1da177e4 1400
27a3421e 1401 if (tb[TCA_CBQ_RTAB] == NULL || tb[TCA_CBQ_RATE] == NULL)
1da177e4
LT		 1402 return -EINVAL;
1403
1e90474c 1404 r = nla_data(tb[TCA_CBQ_RATE]);
1da177e4 1405
1e90474c 1406 if ((q->link.R_tab = qdisc_get_rtab(r, tb[TCA_CBQ_RTAB])) == NULL)
1da177e4
LT		 1407 return -EINVAL;
1408
1409 q->link.refcnt = 1;
1410 q->link.sibling = &q->link;
1411 q->link.classid = sch->handle;
1412 q->link.qdisc = sch;
9f9afec4
PM		 1413 if (!(q->link.q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops,
1414 sch->handle)))
1da177e4
LT		 1415 q->link.q = &noop_qdisc;
1416
1417 q->link.priority = TC_CBQ_MAXPRIO-1;
1418 q->link.priority2 = TC_CBQ_MAXPRIO-1;
1419 q->link.cpriority = TC_CBQ_MAXPRIO-1;
1420 q->link.ovl_strategy = TC_CBQ_OVL_CLASSIC;
1421 q->link.overlimit = cbq_ovl_classic;
1422 q->link.allot = psched_mtu(sch->dev);
1423 q->link.quantum = q->link.allot;
1424 q->link.weight = q->link.R_tab->rate.rate;
1425
1426 q->link.ewma_log = TC_CBQ_DEF_EWMA;
1427 q->link.avpkt = q->link.allot/2;
1428 q->link.minidle = -0x7FFFFFFF;
1da177e4 1429
88a99354 1430 qdisc_watchdog_init(&q->watchdog, sch);
1a13cb63 1431 hrtimer_init(&q->delay_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
1da177e4
LT		 1432 q->delay_timer.function = cbq_undelay;
1433 q->toplevel = TC_CBQ_MAXLEVEL;
3bebcda2 1434 q->now = psched_get_time();
1da177e4
LT		 1435 q->now_rt = q->now;
1436
1437 cbq_link_class(&q->link);
1438
1e90474c
PM		 1439 if (tb[TCA_CBQ_LSSOPT])
1440 cbq_set_lss(&q->link, nla_data(tb[TCA_CBQ_LSSOPT]));
1da177e4
LT		 1441
1442 cbq_addprio(q, &q->link);
1443 return 0;
1444}
1445
1446static __inline__ int cbq_dump_rate(struct sk_buff *skb, struct cbq_class *cl)
1447{
27a884dc 1448 unsigned char *b = skb_tail_pointer(skb);
1da177e4 1449
1e90474c 1450 NLA_PUT(skb, TCA_CBQ_RATE, sizeof(cl->R_tab->rate), &cl->R_tab->rate);
1da177e4
LT		 1451 return skb->len;
1452
1e90474c 1453nla_put_failure:
dc5fc579 1454 nlmsg_trim(skb, b);
1da177e4
LT		 1455 return -1;
1456}
1457
1458static __inline__ int cbq_dump_lss(struct sk_buff *skb, struct cbq_class *cl)
1459{
27a884dc 1460 unsigned char *b = skb_tail_pointer(skb);
1da177e4
LT		 1461 struct tc_cbq_lssopt opt;
1462
1463 opt.flags = 0;
1464 if (cl->borrow == NULL)
1465 opt.flags |= TCF_CBQ_LSS_BOUNDED;
1466 if (cl->share == NULL)
1467 opt.flags |= TCF_CBQ_LSS_ISOLATED;
1468 opt.ewma_log = cl->ewma_log;
1469 opt.level = cl->level;
1470 opt.avpkt = cl->avpkt;
1471 opt.maxidle = cl->maxidle;
1472 opt.minidle = (u32)(-cl->minidle);
1473 opt.offtime = cl->offtime;
1474 opt.change = ~0;
1e90474c 1475 NLA_PUT(skb, TCA_CBQ_LSSOPT, sizeof(opt), &opt);
1da177e4
LT		 1476 return skb->len;
1477
1e90474c 1478nla_put_failure:
dc5fc579 1479 nlmsg_trim(skb, b);
1da177e4
LT		 1480 return -1;
1481}
1482
1483static __inline__ int cbq_dump_wrr(struct sk_buff *skb, struct cbq_class *cl)
1484{
27a884dc 1485 unsigned char *b = skb_tail_pointer(skb);
1da177e4
LT		 1486 struct tc_cbq_wrropt opt;
1487
1488 opt.flags = 0;
1489 opt.allot = cl->allot;
1490 opt.priority = cl->priority+1;
1491 opt.cpriority = cl->cpriority+1;
1492 opt.weight = cl->weight;
1e90474c 1493 NLA_PUT(skb, TCA_CBQ_WRROPT, sizeof(opt), &opt);
1da177e4
LT		 1494 return skb->len;
1495
1e90474c 1496nla_put_failure:
dc5fc579 1497 nlmsg_trim(skb, b);
1da177e4
LT		 1498 return -1;
1499}
1500
1501static __inline__ int cbq_dump_ovl(struct sk_buff *skb, struct cbq_class *cl)
1502{
27a884dc 1503 unsigned char *b = skb_tail_pointer(skb);
1da177e4
LT		 1504 struct tc_cbq_ovl opt;
1505
1506 opt.strategy = cl->ovl_strategy;
1507 opt.priority2 = cl->priority2+1;
8a47077a 1508 opt.pad = 0;
1a13cb63 1509 opt.penalty = cl->penalty;
1e90474c 1510 NLA_PUT(skb, TCA_CBQ_OVL_STRATEGY, sizeof(opt), &opt);
1da177e4
LT		 1511 return skb->len;
1512
1e90474c 1513nla_put_failure:
dc5fc579 1514 nlmsg_trim(skb, b);
1da177e4
LT		 1515 return -1;
1516}
1517
1518static __inline__ int cbq_dump_fopt(struct sk_buff *skb, struct cbq_class *cl)
1519{
27a884dc 1520 unsigned char *b = skb_tail_pointer(skb);
1da177e4
LT		 1521 struct tc_cbq_fopt opt;
1522
1523 if (cl->split || cl->defmap) {
1524 opt.split = cl->split ? cl->split->classid : 0;
1525 opt.defmap = cl->defmap;
1526 opt.defchange = ~0;
1e90474c 1527 NLA_PUT(skb, TCA_CBQ_FOPT, sizeof(opt), &opt);
1da177e4
LT		 1528 }
1529 return skb->len;
1530
1e90474c 1531nla_put_failure:
dc5fc579 1532 nlmsg_trim(skb, b);
1da177e4
LT		 1533 return -1;
1534}
1535
c3bc7cff 1536#ifdef CONFIG_NET_CLS_ACT
1da177e4
LT		 1537static __inline__ int cbq_dump_police(struct sk_buff *skb, struct cbq_class *cl)
1538{
27a884dc 1539 unsigned char *b = skb_tail_pointer(skb);
1da177e4
LT		 1540 struct tc_cbq_police opt;
1541
1542 if (cl->police) {
1543 opt.police = cl->police;
9ef1d4c7
PM		 1544 opt.__res1 = 0;
1545 opt.__res2 = 0;
1e90474c 1546 NLA_PUT(skb, TCA_CBQ_POLICE, sizeof(opt), &opt);
1da177e4
LT		 1547 }
1548 return skb->len;
1549
1e90474c 1550nla_put_failure:
dc5fc579 1551 nlmsg_trim(skb, b);
1da177e4
LT		 1552 return -1;
1553}
1554#endif
1555
1556static int cbq_dump_attr(struct sk_buff *skb, struct cbq_class *cl)
1557{
1558 if (cbq_dump_lss(skb, cl) < 0 ||
1559 cbq_dump_rate(skb, cl) < 0 ||
1560 cbq_dump_wrr(skb, cl) < 0 ||
1561 cbq_dump_ovl(skb, cl) < 0 ||
c3bc7cff 1562#ifdef CONFIG_NET_CLS_ACT
1da177e4
LT		 1563 cbq_dump_police(skb, cl) < 0 ||
1564#endif
1565 cbq_dump_fopt(skb, cl) < 0)
1566 return -1;
1567 return 0;
1568}
1569
1570static int cbq_dump(struct Qdisc *sch, struct sk_buff *skb)
1571{
1572 struct cbq_sched_data *q = qdisc_priv(sch);
4b3550ef 1573 struct nlattr *nest;
1da177e4 1574
4b3550ef
PM		 1575 nest = nla_nest_start(skb, TCA_OPTIONS);
1576 if (nest == NULL)
1577 goto nla_put_failure;
1da177e4 1578 if (cbq_dump_attr(skb, &q->link) < 0)
1e90474c 1579 goto nla_put_failure;
4b3550ef 1580 nla_nest_end(skb, nest);
1da177e4
LT		 1581 return skb->len;
1582
1e90474c 1583nla_put_failure:
4b3550ef 1584 nla_nest_cancel(skb, nest);
1da177e4
LT		 1585 return -1;
1586}
1587
1588static int
1589cbq_dump_stats(struct Qdisc *sch, struct gnet_dump *d)
1590{
1591 struct cbq_sched_data *q = qdisc_priv(sch);
1592
1593 q->link.xstats.avgidle = q->link.avgidle;
1594 return gnet_stats_copy_app(d, &q->link.xstats, sizeof(q->link.xstats));
1595}
1596
1597static int
1598cbq_dump_class(struct Qdisc *sch, unsigned long arg,
1599 struct sk_buff *skb, struct tcmsg *tcm)
1600{
1601 struct cbq_class *cl = (struct cbq_class*)arg;
4b3550ef 1602 struct nlattr *nest;
1da177e4
LT		 1603
1604 if (cl->tparent)
1605 tcm->tcm_parent = cl->tparent->classid;
1606 else
1607 tcm->tcm_parent = TC_H_ROOT;
1608 tcm->tcm_handle = cl->classid;
1609 tcm->tcm_info = cl->q->handle;
1610
4b3550ef
PM		 1611 nest = nla_nest_start(skb, TCA_OPTIONS);
1612 if (nest == NULL)
1613 goto nla_put_failure;
1da177e4 1614 if (cbq_dump_attr(skb, cl) < 0)
1e90474c 1615 goto nla_put_failure;
4b3550ef 1616 nla_nest_end(skb, nest);
1da177e4
LT		 1617 return skb->len;
1618
1e90474c 1619nla_put_failure:
4b3550ef 1620 nla_nest_cancel(skb, nest);
1da177e4
LT		 1621 return -1;
1622}
1623
1624static int
1625cbq_dump_class_stats(struct Qdisc *sch, unsigned long arg,
1626 struct gnet_dump *d)
1627{
1628 struct cbq_sched_data *q = qdisc_priv(sch);
1629 struct cbq_class *cl = (struct cbq_class*)arg;
1630
1631 cl->qstats.qlen = cl->q->q.qlen;
1632 cl->xstats.avgidle = cl->avgidle;
1633 cl->xstats.undertime = 0;
1634
a084980d 1635 if (cl->undertime != PSCHED_PASTPERFECT)
8edc0c31 1636 cl->xstats.undertime = cl->undertime - q->now;
1da177e4
LT		 1637
1638 if (gnet_stats_copy_basic(d, &cl->bstats) < 0 ||
1da177e4 1639 gnet_stats_copy_rate_est(d, &cl->rate_est) < 0 ||
1da177e4
LT		 1640 gnet_stats_copy_queue(d, &cl->qstats) < 0)
1641 return -1;
1642
1643 return gnet_stats_copy_app(d, &cl->xstats, sizeof(cl->xstats));
1644}
1645
1646static int cbq_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new,
1647 struct Qdisc **old)
1648{
1649 struct cbq_class *cl = (struct cbq_class*)arg;
1650
1651 if (cl) {
1652 if (new == NULL) {
9f9afec4
PM		 1653 if ((new = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops,
1654 cl->classid)) == NULL)
1da177e4
LT		 1655 return -ENOBUFS;
1656 } else {
c3bc7cff 1657#ifdef CONFIG_NET_CLS_ACT
1da177e4
LT		 1658 if (cl->police == TC_POLICE_RECLASSIFY)
1659 new->reshape_fail = cbq_reshape_fail;
1660#endif
1661 }
1662 sch_tree_lock(sch);
a37ef2e3 1663 *old = xchg(&cl->q, new);
5e50da01 1664 qdisc_tree_decrease_qlen(*old, (*old)->q.qlen);
1da177e4
LT		 1665 qdisc_reset(*old);
1666 sch_tree_unlock(sch);
1667
1668 return 0;
1669 }
1670 return -ENOENT;
1671}
1672
1673static struct Qdisc *
1674cbq_leaf(struct Qdisc *sch, unsigned long arg)
1675{
1676 struct cbq_class *cl = (struct cbq_class*)arg;
1677
1678 return cl ? cl->q : NULL;
1679}
1680
a37ef2e3
JP		 1681static void cbq_qlen_notify(struct Qdisc *sch, unsigned long arg)
1682{
1683 struct cbq_class *cl = (struct cbq_class *)arg;
1684
1685 if (cl->q->q.qlen == 0)
1686 cbq_deactivate_class(cl);
1687}
1688
1da177e4
LT		 1689static unsigned long cbq_get(struct Qdisc *sch, u32 classid)
1690{
1691 struct cbq_sched_data *q = qdisc_priv(sch);
1692 struct cbq_class *cl = cbq_class_lookup(q, classid);
1693
1694 if (cl) {
1695 cl->refcnt++;
1696 return (unsigned long)cl;
1697 }
1698 return 0;
1699}
1700
1da177e4
LT		 1701static void cbq_destroy_class(struct Qdisc *sch, struct cbq_class *cl)
1702{
1703 struct cbq_sched_data *q = qdisc_priv(sch);
1704
1705 BUG_TRAP(!cl->filters);
1706
ff31ab56 1707 tcf_destroy_chain(&cl->filter_list);
1da177e4
LT		 1708 qdisc_destroy(cl->q);
1709 qdisc_put_rtab(cl->R_tab);
1da177e4 1710 gen_kill_estimator(&cl->bstats, &cl->rate_est);
1da177e4
LT		 1711 if (cl != &q->link)
1712 kfree(cl);
1713}
1714
1715static void
1716cbq_destroy(struct Qdisc* sch)
1717{
1718 struct cbq_sched_data *q = qdisc_priv(sch);
1719 struct cbq_class *cl;
1720 unsigned h;
1721
c3bc7cff 1722#ifdef CONFIG_NET_CLS_ACT
1da177e4
LT		 1723 q->rx_class = NULL;
1724#endif
1725 /*
1726 * Filters must be destroyed first because we don't destroy the
1727 * classes from root to leafs which means that filters can still
1728 * be bound to classes which have been destroyed already. --TGR '04
1729 */
b00b4bf9 1730 for (h = 0; h < 16; h++) {
ff31ab56
PM		 1731 for (cl = q->classes[h]; cl; cl = cl->next)
1732 tcf_destroy_chain(&cl->filter_list);
b00b4bf9 1733 }
1da177e4
LT		 1734 for (h = 0; h < 16; h++) {
1735 struct cbq_class *next;
1736
1737 for (cl = q->classes[h]; cl; cl = next) {
1738 next = cl->next;
1739 cbq_destroy_class(sch, cl);
1740 }
1741 }
1742}
1743
1744static void cbq_put(struct Qdisc *sch, unsigned long arg)
1745{
1746 struct cbq_class *cl = (struct cbq_class*)arg;
1747
1748 if (--cl->refcnt == 0) {
c3bc7cff 1749#ifdef CONFIG_NET_CLS_ACT
1da177e4
LT		 1750 struct cbq_sched_data *q = qdisc_priv(sch);
1751
1752 spin_lock_bh(&sch->dev->queue_lock);
1753 if (q->rx_class == cl)
1754 q->rx_class = NULL;
1755 spin_unlock_bh(&sch->dev->queue_lock);
1756#endif
1757
1758 cbq_destroy_class(sch, cl);
1759 }
1760}
1761
1762static int
1e90474c 1763cbq_change_class(struct Qdisc *sch, u32 classid, u32 parentid, struct nlattr **tca,
1da177e4
LT		 1764 unsigned long *arg)
1765{
1766 int err;
1767 struct cbq_sched_data *q = qdisc_priv(sch);
1768 struct cbq_class *cl = (struct cbq_class*)*arg;
1e90474c
PM		 1769 struct nlattr *opt = tca[TCA_OPTIONS];
1770 struct nlattr *tb[TCA_CBQ_MAX + 1];
1da177e4
LT		 1771 struct cbq_class *parent;
1772 struct qdisc_rate_table *rtab = NULL;
1773
cee63723 1774 if (opt == NULL)
1da177e4
LT		 1775 return -EINVAL;
1776
27a3421e 1777 err = nla_parse_nested(tb, TCA_CBQ_MAX, opt, cbq_policy);
cee63723
PM		 1778 if (err < 0)
1779 return err;
1780
1da177e4
LT		 1781 if (cl) {
1782 /* Check parent */
1783 if (parentid) {
1784 if (cl->tparent && cl->tparent->classid != parentid)
1785 return -EINVAL;
1786 if (!cl->tparent && parentid != TC_H_ROOT)
1787 return -EINVAL;
1788 }
1789
1e90474c
PM		 1790 if (tb[TCA_CBQ_RATE]) {
1791 rtab = qdisc_get_rtab(nla_data(tb[TCA_CBQ_RATE]), tb[TCA_CBQ_RTAB]);
1da177e4
LT		 1792 if (rtab == NULL)
1793 return -EINVAL;
1794 }
1795
1796 /* Change class parameters */
1797 sch_tree_lock(sch);
1798
1799 if (cl->next_alive != NULL)
1800 cbq_deactivate_class(cl);
1801
1802 if (rtab) {
1803 rtab = xchg(&cl->R_tab, rtab);
1804 qdisc_put_rtab(rtab);
1805 }
1806
1e90474c
PM		 1807 if (tb[TCA_CBQ_LSSOPT])
1808 cbq_set_lss(cl, nla_data(tb[TCA_CBQ_LSSOPT]));
1da177e4 1809
1e90474c 1810 if (tb[TCA_CBQ_WRROPT]) {
1da177e4 1811 cbq_rmprio(q, cl);
1e90474c 1812 cbq_set_wrr(cl, nla_data(tb[TCA_CBQ_WRROPT]));
1da177e4
LT		 1813 }
1814
1e90474c
PM		 1815 if (tb[TCA_CBQ_OVL_STRATEGY])
1816 cbq_set_overlimit(cl, nla_data(tb[TCA_CBQ_OVL_STRATEGY]));
1da177e4 1817
c3bc7cff 1818#ifdef CONFIG_NET_CLS_ACT
1e90474c
PM		 1819 if (tb[TCA_CBQ_POLICE])
1820 cbq_set_police(cl, nla_data(tb[TCA_CBQ_POLICE]));
1da177e4
LT		 1821#endif
1822
1e90474c
PM		 1823 if (tb[TCA_CBQ_FOPT])
1824 cbq_set_fopt(cl, nla_data(tb[TCA_CBQ_FOPT]));
1da177e4
LT		 1825
1826 if (cl->q->q.qlen)
1827 cbq_activate_class(cl);
1828
1829 sch_tree_unlock(sch);
1830
1e90474c 1831 if (tca[TCA_RATE])
1da177e4 1832 gen_replace_estimator(&cl->bstats, &cl->rate_est,
4bdf3991 1833 &sch->dev->queue_lock,
1e90474c 1834 tca[TCA_RATE]);
1da177e4
LT		 1835 return 0;
1836 }
1837
1838 if (parentid == TC_H_ROOT)
1839 return -EINVAL;
1840
1e90474c
PM		 1841 if (tb[TCA_CBQ_WRROPT] == NULL || tb[TCA_CBQ_RATE] == NULL ||
1842 tb[TCA_CBQ_LSSOPT] == NULL)
1da177e4
LT		 1843 return -EINVAL;
1844
1e90474c 1845 rtab = qdisc_get_rtab(nla_data(tb[TCA_CBQ_RATE]), tb[TCA_CBQ_RTAB]);
1da177e4
LT		 1846 if (rtab == NULL)
1847 return -EINVAL;
1848
1849 if (classid) {
1850 err = -EINVAL;
1851 if (TC_H_MAJ(classid^sch->handle) || cbq_class_lookup(q, classid))
1852 goto failure;
1853 } else {
1854 int i;
1855 classid = TC_H_MAKE(sch->handle,0x8000);
1856
1857 for (i=0; i<0x8000; i++) {
1858 if (++q->hgenerator >= 0x8000)
1859 q->hgenerator = 1;
1860 if (cbq_class_lookup(q, classid|q->hgenerator) == NULL)
1861 break;
1862 }
1863 err = -ENOSR;
1864 if (i >= 0x8000)
1865 goto failure;
1866 classid = classid|q->hgenerator;
1867 }
1868
1869 parent = &q->link;
1870 if (parentid) {
1871 parent = cbq_class_lookup(q, parentid);
1872 err = -EINVAL;
1873 if (parent == NULL)
1874 goto failure;
1875 }
1876
1877 err = -ENOBUFS;
0da974f4 1878 cl = kzalloc(sizeof(*cl), GFP_KERNEL);
1da177e4
LT		 1879 if (cl == NULL)
1880 goto failure;
1da177e4
LT		 1881 cl->R_tab = rtab;
1882 rtab = NULL;
1883 cl->refcnt = 1;
9f9afec4 1884 if (!(cl->q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops, classid)))
1da177e4
LT		 1885 cl->q = &noop_qdisc;
1886 cl->classid = classid;
1887 cl->tparent = parent;
1888 cl->qdisc = sch;
1889 cl->allot = parent->allot;
1890 cl->quantum = cl->allot;
1891 cl->weight = cl->R_tab->rate.rate;
1da177e4
LT		 1892
1893 sch_tree_lock(sch);
1894 cbq_link_class(cl);
1895 cl->borrow = cl->tparent;
1896 if (cl->tparent != &q->link)
1897 cl->share = cl->tparent;
1898 cbq_adjust_levels(parent);
1899 cl->minidle = -0x7FFFFFFF;
1e90474c
PM		 1900 cbq_set_lss(cl, nla_data(tb[TCA_CBQ_LSSOPT]));
1901 cbq_set_wrr(cl, nla_data(tb[TCA_CBQ_WRROPT]));
1da177e4
LT		 1902 if (cl->ewma_log==0)
1903 cl->ewma_log = q->link.ewma_log;
1904 if (cl->maxidle==0)
1905 cl->maxidle = q->link.maxidle;
1906 if (cl->avpkt==0)
1907 cl->avpkt = q->link.avpkt;
1908 cl->overlimit = cbq_ovl_classic;
1e90474c
PM		 1909 if (tb[TCA_CBQ_OVL_STRATEGY])
1910 cbq_set_overlimit(cl, nla_data(tb[TCA_CBQ_OVL_STRATEGY]));
c3bc7cff 1911#ifdef CONFIG_NET_CLS_ACT
1e90474c
PM		 1912 if (tb[TCA_CBQ_POLICE])
1913 cbq_set_police(cl, nla_data(tb[TCA_CBQ_POLICE]));
1da177e4 1914#endif
1e90474c
PM		 1915 if (tb[TCA_CBQ_FOPT])
1916 cbq_set_fopt(cl, nla_data(tb[TCA_CBQ_FOPT]));
1da177e4
LT		 1917 sch_tree_unlock(sch);
1918
1e90474c 1919 if (tca[TCA_RATE])
1da177e4 1920 gen_new_estimator(&cl->bstats, &cl->rate_est,
1e90474c 1921 &sch->dev->queue_lock, tca[TCA_RATE]);
1da177e4
LT		 1922
1923 *arg = (unsigned long)cl;
1924 return 0;
1925
1926failure:
1927 qdisc_put_rtab(rtab);
1928 return err;
1929}
1930
1931static int cbq_delete(struct Qdisc *sch, unsigned long arg)
1932{
1933 struct cbq_sched_data *q = qdisc_priv(sch);
1934 struct cbq_class *cl = (struct cbq_class*)arg;
a37ef2e3 1935 unsigned int qlen;
1da177e4
LT		 1936
1937 if (cl->filters || cl->children || cl == &q->link)
1938 return -EBUSY;
1939
1940 sch_tree_lock(sch);
1941
a37ef2e3
JP		 1942 qlen = cl->q->q.qlen;
1943 qdisc_reset(cl->q);
1944 qdisc_tree_decrease_qlen(cl->q, qlen);
1945
1da177e4
LT		 1946 if (cl->next_alive)
1947 cbq_deactivate_class(cl);
1948
1949 if (q->tx_borrowed == cl)
1950 q->tx_borrowed = q->tx_class;
1951 if (q->tx_class == cl) {
1952 q->tx_class = NULL;
1953 q->tx_borrowed = NULL;
1954 }
c3bc7cff 1955#ifdef CONFIG_NET_CLS_ACT
1da177e4
LT		 1956 if (q->rx_class == cl)
1957 q->rx_class = NULL;
1958#endif
1959
1960 cbq_unlink_class(cl);
1961 cbq_adjust_levels(cl->tparent);
1962 cl->defmap = 0;
1963 cbq_sync_defmap(cl);
1964
1965 cbq_rmprio(q, cl);
1966 sch_tree_unlock(sch);
1967
1968 if (--cl->refcnt == 0)
1969 cbq_destroy_class(sch, cl);
1970
1971 return 0;
1972}
1973
1974static struct tcf_proto **cbq_find_tcf(struct Qdisc *sch, unsigned long arg)
1975{
1976 struct cbq_sched_data *q = qdisc_priv(sch);
1977 struct cbq_class *cl = (struct cbq_class *)arg;
1978
1979 if (cl == NULL)
1980 cl = &q->link;
1981
1982 return &cl->filter_list;
1983}
1984
1985static unsigned long cbq_bind_filter(struct Qdisc *sch, unsigned long parent,
1986 u32 classid)
1987{
1988 struct cbq_sched_data *q = qdisc_priv(sch);
1989 struct cbq_class *p = (struct cbq_class*)parent;
1990 struct cbq_class *cl = cbq_class_lookup(q, classid);
1991
1992 if (cl) {
1993 if (p && p->level <= cl->level)
1994 return 0;
1995 cl->filters++;
1996 return (unsigned long)cl;
1997 }
1998 return 0;
1999}
2000
2001static void cbq_unbind_filter(struct Qdisc *sch, unsigned long arg)
2002{
2003 struct cbq_class *cl = (struct cbq_class*)arg;
2004
2005 cl->filters--;
2006}
2007
2008static void cbq_walk(struct Qdisc *sch, struct qdisc_walker *arg)
2009{
2010 struct cbq_sched_data *q = qdisc_priv(sch);
2011 unsigned h;
2012
2013 if (arg->stop)
2014 return;
2015
2016 for (h = 0; h < 16; h++) {
2017 struct cbq_class *cl;
2018
2019 for (cl = q->classes[h]; cl; cl = cl->next) {
2020 if (arg->count < arg->skip) {
2021 arg->count++;
2022 continue;
2023 }
2024 if (arg->fn(sch, (unsigned long)cl, arg) < 0) {
2025 arg->stop = 1;
2026 return;
2027 }
2028 arg->count++;
2029 }
2030 }
2031}
2032
20fea08b 2033static const struct Qdisc_class_ops cbq_class_ops = {
1da177e4
LT		 2034 .graft = cbq_graft,
2035 .leaf = cbq_leaf,
a37ef2e3 2036 .qlen_notify = cbq_qlen_notify,
1da177e4
LT		 2037 .get = cbq_get,
2038 .put = cbq_put,
2039 .change = cbq_change_class,
2040 .delete = cbq_delete,
2041 .walk = cbq_walk,
2042 .tcf_chain = cbq_find_tcf,
2043 .bind_tcf = cbq_bind_filter,
2044 .unbind_tcf = cbq_unbind_filter,
2045 .dump = cbq_dump_class,
2046 .dump_stats = cbq_dump_class_stats,
2047};
2048
20fea08b 2049static struct Qdisc_ops cbq_qdisc_ops __read_mostly = {
1da177e4
LT		 2050 .next = NULL,
2051 .cl_ops = &cbq_class_ops,
2052 .id = "cbq",
2053 .priv_size = sizeof(struct cbq_sched_data),
2054 .enqueue = cbq_enqueue,
2055 .dequeue = cbq_dequeue,
2056 .requeue = cbq_requeue,
2057 .drop = cbq_drop,
2058 .init = cbq_init,
2059 .reset = cbq_reset,
2060 .destroy = cbq_destroy,
2061 .change = NULL,
2062 .dump = cbq_dump,
2063 .dump_stats = cbq_dump_stats,
2064 .owner = THIS_MODULE,
2065};
2066
2067static int __init cbq_module_init(void)
2068{
2069 return register_qdisc(&cbq_qdisc_ops);
2070}
10297b99 2071static void __exit cbq_module_exit(void)
1da177e4
LT		 2072{
2073 unregister_qdisc(&cbq_qdisc_ops);
2074}
2075module_init(cbq_module_init)
2076module_exit(cbq_module_exit)
2077MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)