?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
stack-protector: Fix test with 32-bit userland and CONFIG_64BIT=y
[linux/fpc-iii.git] / net / sched / sch_sfb.c
blob7cbdad8419b7f4d9c6441fce0b822db1d058b176
1 /*
2 * net/sched/sch_sfb.c Stochastic Fair Blue
3 *
4 * Copyright (c) 2008-2011 Juliusz Chroboczek <jch@pps.jussieu.fr>
5 * Copyright (c) 2011 Eric Dumazet <eric.dumazet@gmail.com>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * version 2 as published by the Free Software Foundation.
10 *
11 * W. Feng, D. Kandlur, D. Saha, K. Shin. Blue:
12 * A New Class of Active Queue Management Algorithms.
13 * U. Michigan CSE-TR-387-99, April 1999.
14 *
15 * http://www.thefengs.com/wuchang/blue/CSE-TR-387-99.pdf
16 *
17 */
18
19 #include <linux/module.h>
20 #include <linux/types.h>
21 #include <linux/kernel.h>
22 #include <linux/errno.h>
23 #include <linux/skbuff.h>
24 #include <linux/random.h>
25 #include <linux/jhash.h>
26 #include <net/ip.h>
27 #include <net/pkt_sched.h>
28 #include <net/pkt_cls.h>
29 #include <net/inet_ecn.h>
30
31 /*
32 * SFB uses two B[l][n] : L x N arrays of bins (L levels, N bins per level)
33 * This implementation uses L = 8 and N = 16
34 * This permits us to split one 32bit hash (provided per packet by rxhash or
35 * external classifier) into 8 subhashes of 4 bits.
36 */
37 #define SFB_BUCKET_SHIFT 4
38 #define SFB_NUMBUCKETS (1 << SFB_BUCKET_SHIFT) /* N bins per Level */
39 #define SFB_BUCKET_MASK (SFB_NUMBUCKETS - 1)
40 #define SFB_LEVELS (32 / SFB_BUCKET_SHIFT) /* L */
41
42 /* SFB algo uses a virtual queue, named "bin" */
43 struct sfb_bucket {
44 u16 qlen; /* length of virtual queue */
45 u16 p_mark; /* marking probability */
46 };
47
48 /* We use a double buffering right before hash change
49 * (Section 4.4 of SFB reference : moving hash functions)
50 */
51 struct sfb_bins {
52 u32 perturbation; /* jhash perturbation */
53 struct sfb_bucket bins[SFB_LEVELS][SFB_NUMBUCKETS];
54 };
55
56 struct sfb_sched_data {
57 struct Qdisc *qdisc;
58 struct tcf_proto __rcu *filter_list;
59 struct tcf_block *block;
60 unsigned long rehash_interval;
61 unsigned long warmup_time; /* double buffering warmup time in jiffies */
62 u32 max;
63 u32 bin_size; /* maximum queue length per bin */
64 u32 increment; /* d1 */
65 u32 decrement; /* d2 */
66 u32 limit; /* HARD maximal queue length */
67 u32 penalty_rate;
68 u32 penalty_burst;
69 u32 tokens_avail;
70 unsigned long rehash_time;
71 unsigned long token_time;
72
73 u8 slot; /* current active bins (0 or 1) */
74 bool double_buffering;
75 struct sfb_bins bins[2];
76
77 struct {
78 u32 earlydrop;
79 u32 penaltydrop;
80 u32 bucketdrop;
81 u32 queuedrop;
82 u32 childdrop; /* drops in child qdisc */
83 u32 marked; /* ECN mark */
84 } stats;
85 };
86
87 /*
88 * Each queued skb might be hashed on one or two bins
89 * We store in skb_cb the two hash values.
90 * (A zero value means double buffering was not used)
91 */
92 struct sfb_skb_cb {
93 u32 hashes[2];
94 };
95
96 static inline struct sfb_skb_cb *sfb_skb_cb(const struct sk_buff *skb)
97 {
98 qdisc_cb_private_validate(skb, sizeof(struct sfb_skb_cb));
99 return (struct sfb_skb_cb *)qdisc_skb_cb(skb)->data;
100 }
101
102 /*
103 * If using 'internal' SFB flow classifier, hash comes from skb rxhash
104 * If using external classifier, hash comes from the classid.
105 */
106 static u32 sfb_hash(const struct sk_buff *skb, u32 slot)
107 {
108 return sfb_skb_cb(skb)->hashes[slot];
109 }
110
111 /* Probabilities are coded as Q0.16 fixed-point values,
112 * with 0xFFFF representing 65535/65536 (almost 1.0)
113 * Addition and subtraction are saturating in [0, 65535]
114 */
115 static u32 prob_plus(u32 p1, u32 p2)
116 {
117 u32 res = p1 + p2;
118
119 return min_t(u32, res, SFB_MAX_PROB);
120 }
121
122 static u32 prob_minus(u32 p1, u32 p2)
123 {
124 return p1 > p2 ? p1 - p2 : 0;
125 }
126
127 static void increment_one_qlen(u32 sfbhash, u32 slot, struct sfb_sched_data *q)
128 {
129 int i;
130 struct sfb_bucket *b = &q->bins[slot].bins[0][0];
131
132 for (i = 0; i < SFB_LEVELS; i++) {
133 u32 hash = sfbhash & SFB_BUCKET_MASK;
134
135 sfbhash >>= SFB_BUCKET_SHIFT;
136 if (b[hash].qlen < 0xFFFF)
137 b[hash].qlen++;
138 b += SFB_NUMBUCKETS; /* next level */
139 }
140 }
141
142 static void increment_qlen(const struct sk_buff *skb, struct sfb_sched_data *q)
143 {
144 u32 sfbhash;
145
146 sfbhash = sfb_hash(skb, 0);
147 if (sfbhash)
148 increment_one_qlen(sfbhash, 0, q);
149
150 sfbhash = sfb_hash(skb, 1);
151 if (sfbhash)
152 increment_one_qlen(sfbhash, 1, q);
153 }
154
155 static void decrement_one_qlen(u32 sfbhash, u32 slot,
156 struct sfb_sched_data *q)
157 {
158 int i;
159 struct sfb_bucket *b = &q->bins[slot].bins[0][0];
160
161 for (i = 0; i < SFB_LEVELS; i++) {
162 u32 hash = sfbhash & SFB_BUCKET_MASK;
163
164 sfbhash >>= SFB_BUCKET_SHIFT;
165 if (b[hash].qlen > 0)
166 b[hash].qlen--;
167 b += SFB_NUMBUCKETS; /* next level */
168 }
169 }
170
171 static void decrement_qlen(const struct sk_buff *skb, struct sfb_sched_data *q)
172 {
173 u32 sfbhash;
174
175 sfbhash = sfb_hash(skb, 0);
176 if (sfbhash)
177 decrement_one_qlen(sfbhash, 0, q);
178
179 sfbhash = sfb_hash(skb, 1);
180 if (sfbhash)
181 decrement_one_qlen(sfbhash, 1, q);
182 }
183
184 static void decrement_prob(struct sfb_bucket *b, struct sfb_sched_data *q)
185 {
186 b->p_mark = prob_minus(b->p_mark, q->decrement);
187 }
188
189 static void increment_prob(struct sfb_bucket *b, struct sfb_sched_data *q)
190 {
191 b->p_mark = prob_plus(b->p_mark, q->increment);
192 }
193
194 static void sfb_zero_all_buckets(struct sfb_sched_data *q)
195 {
196 memset(&q->bins, 0, sizeof(q->bins));
197 }
198
199 /*
200 * compute max qlen, max p_mark, and avg p_mark
201 */
202 static u32 sfb_compute_qlen(u32 *prob_r, u32 *avgpm_r, const struct sfb_sched_data *q)
203 {
204 int i;
205 u32 qlen = 0, prob = 0, totalpm = 0;
206 const struct sfb_bucket *b = &q->bins[q->slot].bins[0][0];
207
208 for (i = 0; i < SFB_LEVELS * SFB_NUMBUCKETS; i++) {
209 if (qlen < b->qlen)
210 qlen = b->qlen;
211 totalpm += b->p_mark;
212 if (prob < b->p_mark)
213 prob = b->p_mark;
214 b++;
215 }
216 *prob_r = prob;
217 *avgpm_r = totalpm / (SFB_LEVELS * SFB_NUMBUCKETS);
218 return qlen;
219 }
220
221
222 static void sfb_init_perturbation(u32 slot, struct sfb_sched_data *q)
223 {
224 q->bins[slot].perturbation = prandom_u32();
225 }
226
227 static void sfb_swap_slot(struct sfb_sched_data *q)
228 {
229 sfb_init_perturbation(q->slot, q);
230 q->slot ^= 1;
231 q->double_buffering = false;
232 }
233
234 /* Non elastic flows are allowed to use part of the bandwidth, expressed
235 * in "penalty_rate" packets per second, with "penalty_burst" burst
236 */
237 static bool sfb_rate_limit(struct sk_buff *skb, struct sfb_sched_data *q)
238 {
239 if (q->penalty_rate == 0 || q->penalty_burst == 0)
240 return true;
241
242 if (q->tokens_avail < 1) {
243 unsigned long age = min(10UL * HZ, jiffies - q->token_time);
244
245 q->tokens_avail = (age * q->penalty_rate) / HZ;
246 if (q->tokens_avail > q->penalty_burst)
247 q->tokens_avail = q->penalty_burst;
248 q->token_time = jiffies;
249 if (q->tokens_avail < 1)
250 return true;
251 }
252
253 q->tokens_avail--;
254 return false;
255 }
256
257 static bool sfb_classify(struct sk_buff *skb, struct tcf_proto *fl,
258 int *qerr, u32 *salt)
259 {
260 struct tcf_result res;
261 int result;
262
263 result = tcf_classify(skb, fl, &res, false);
264 if (result >= 0) {
265 #ifdef CONFIG_NET_CLS_ACT
266 switch (result) {
267 case TC_ACT_STOLEN:
268 case TC_ACT_QUEUED:
269 case TC_ACT_TRAP:
270 *qerr = NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
271 /* fall through */
272 case TC_ACT_SHOT:
273 return false;
274 }
275 #endif
276 *salt = TC_H_MIN(res.classid);
277 return true;
278 }
279 return false;
280 }
281
282 static int sfb_enqueue(struct sk_buff *skb, struct Qdisc *sch,
283 struct sk_buff **to_free)
284 {
285
286 struct sfb_sched_data *q = qdisc_priv(sch);
287 struct Qdisc *child = q->qdisc;
288 struct tcf_proto *fl;
289 int i;
290 u32 p_min = ~0;
291 u32 minqlen = ~0;
292 u32 r, sfbhash;
293 u32 slot = q->slot;
294 int ret = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
295
296 if (unlikely(sch->q.qlen >= q->limit)) {
297 qdisc_qstats_overlimit(sch);
298 q->stats.queuedrop++;
299 goto drop;
300 }
301
302 if (q->rehash_interval > 0) {
303 unsigned long limit = q->rehash_time + q->rehash_interval;
304
305 if (unlikely(time_after(jiffies, limit))) {
306 sfb_swap_slot(q);
307 q->rehash_time = jiffies;
308 } else if (unlikely(!q->double_buffering && q->warmup_time > 0 &&
309 time_after(jiffies, limit - q->warmup_time))) {
310 q->double_buffering = true;
311 }
312 }
313
314 fl = rcu_dereference_bh(q->filter_list);
315 if (fl) {
316 u32 salt;
317
318 /* If using external classifiers, get result and record it. */
319 if (!sfb_classify(skb, fl, &ret, &salt))
320 goto other_drop;
321 sfbhash = jhash_1word(salt, q->bins[slot].perturbation);
322 } else {
323 sfbhash = skb_get_hash_perturb(skb, q->bins[slot].perturbation);
324 }
325
326
327 if (!sfbhash)
328 sfbhash = 1;
329 sfb_skb_cb(skb)->hashes[slot] = sfbhash;
330
331 for (i = 0; i < SFB_LEVELS; i++) {
332 u32 hash = sfbhash & SFB_BUCKET_MASK;
333 struct sfb_bucket *b = &q->bins[slot].bins[i][hash];
334
335 sfbhash >>= SFB_BUCKET_SHIFT;
336 if (b->qlen == 0)
337 decrement_prob(b, q);
338 else if (b->qlen >= q->bin_size)
339 increment_prob(b, q);
340 if (minqlen > b->qlen)
341 minqlen = b->qlen;
342 if (p_min > b->p_mark)
343 p_min = b->p_mark;
344 }
345
346 slot ^= 1;
347 sfb_skb_cb(skb)->hashes[slot] = 0;
348
349 if (unlikely(minqlen >= q->max)) {
350 qdisc_qstats_overlimit(sch);
351 q->stats.bucketdrop++;
352 goto drop;
353 }
354
355 if (unlikely(p_min >= SFB_MAX_PROB)) {
356 /* Inelastic flow */
357 if (q->double_buffering) {
358 sfbhash = skb_get_hash_perturb(skb,
359 q->bins[slot].perturbation);
360 if (!sfbhash)
361 sfbhash = 1;
362 sfb_skb_cb(skb)->hashes[slot] = sfbhash;
363
364 for (i = 0; i < SFB_LEVELS; i++) {
365 u32 hash = sfbhash & SFB_BUCKET_MASK;
366 struct sfb_bucket *b = &q->bins[slot].bins[i][hash];
367
368 sfbhash >>= SFB_BUCKET_SHIFT;
369 if (b->qlen == 0)
370 decrement_prob(b, q);
371 else if (b->qlen >= q->bin_size)
372 increment_prob(b, q);
373 }
374 }
375 if (sfb_rate_limit(skb, q)) {
376 qdisc_qstats_overlimit(sch);
377 q->stats.penaltydrop++;
378 goto drop;
379 }
380 goto enqueue;
381 }
382
383 r = prandom_u32() & SFB_MAX_PROB;
384
385 if (unlikely(r < p_min)) {
386 if (unlikely(p_min > SFB_MAX_PROB / 2)) {
387 /* If we're marking that many packets, then either
388 * this flow is unresponsive, or we're badly congested.
389 * In either case, we want to start dropping packets.
390 */
391 if (r < (p_min - SFB_MAX_PROB / 2) * 2) {
392 q->stats.earlydrop++;
393 goto drop;
394 }
395 }
396 if (INET_ECN_set_ce(skb)) {
397 q->stats.marked++;
398 } else {
399 q->stats.earlydrop++;
400 goto drop;
401 }
402 }
403
404 enqueue:
405 ret = qdisc_enqueue(skb, child, to_free);
406 if (likely(ret == NET_XMIT_SUCCESS)) {
407 qdisc_qstats_backlog_inc(sch, skb);
408 sch->q.qlen++;
409 increment_qlen(skb, q);
410 } else if (net_xmit_drop_count(ret)) {
411 q->stats.childdrop++;
412 qdisc_qstats_drop(sch);
413 }
414 return ret;
415
416 drop:
417 qdisc_drop(skb, sch, to_free);
418 return NET_XMIT_CN;
419 other_drop:
420 if (ret & __NET_XMIT_BYPASS)
421 qdisc_qstats_drop(sch);
422 kfree_skb(skb);
423 return ret;
424 }
425
426 static struct sk_buff *sfb_dequeue(struct Qdisc *sch)
427 {
428 struct sfb_sched_data *q = qdisc_priv(sch);
429 struct Qdisc *child = q->qdisc;
430 struct sk_buff *skb;
431
432 skb = child->dequeue(q->qdisc);
433
434 if (skb) {
435 qdisc_bstats_update(sch, skb);
436 qdisc_qstats_backlog_dec(sch, skb);
437 sch->q.qlen--;
438 decrement_qlen(skb, q);
439 }
440
441 return skb;
442 }
443
444 static struct sk_buff *sfb_peek(struct Qdisc *sch)
445 {
446 struct sfb_sched_data *q = qdisc_priv(sch);
447 struct Qdisc *child = q->qdisc;
448
449 return child->ops->peek(child);
450 }
451
452 /* No sfb_drop -- impossible since the child doesn't return the dropped skb. */
453
454 static void sfb_reset(struct Qdisc *sch)
455 {
456 struct sfb_sched_data *q = qdisc_priv(sch);
457
458 qdisc_reset(q->qdisc);
459 sch->qstats.backlog = 0;
460 sch->q.qlen = 0;
461 q->slot = 0;
462 q->double_buffering = false;
463 sfb_zero_all_buckets(q);
464 sfb_init_perturbation(0, q);
465 }
466
467 static void sfb_destroy(struct Qdisc *sch)
468 {
469 struct sfb_sched_data *q = qdisc_priv(sch);
470
471 tcf_block_put(q->block);
472 qdisc_destroy(q->qdisc);
473 }
474
475 static const struct nla_policy sfb_policy[TCA_SFB_MAX + 1] = {
476 [TCA_SFB_PARMS] = { .len = sizeof(struct tc_sfb_qopt) },
477 };
478
479 static const struct tc_sfb_qopt sfb_default_ops = {
480 .rehash_interval = 600 * MSEC_PER_SEC,
481 .warmup_time = 60 * MSEC_PER_SEC,
482 .limit = 0,
483 .max = 25,
484 .bin_size = 20,
485 .increment = (SFB_MAX_PROB + 500) / 1000, /* 0.1 % */
486 .decrement = (SFB_MAX_PROB + 3000) / 6000,
487 .penalty_rate = 10,
488 .penalty_burst = 20,
489 };
490
491 static int sfb_change(struct Qdisc *sch, struct nlattr *opt,
492 struct netlink_ext_ack *extack)
493 {
494 struct sfb_sched_data *q = qdisc_priv(sch);
495 struct Qdisc *child;
496 struct nlattr *tb[TCA_SFB_MAX + 1];
497 const struct tc_sfb_qopt *ctl = &sfb_default_ops;
498 u32 limit;
499 int err;
500
501 if (opt) {
502 err = nla_parse_nested(tb, TCA_SFB_MAX, opt, sfb_policy, NULL);
503 if (err < 0)
504 return -EINVAL;
505
506 if (tb[TCA_SFB_PARMS] == NULL)
507 return -EINVAL;
508
509 ctl = nla_data(tb[TCA_SFB_PARMS]);
510 }
511
512 limit = ctl->limit;
513 if (limit == 0)
514 limit = qdisc_dev(sch)->tx_queue_len;
515
516 child = fifo_create_dflt(sch, &pfifo_qdisc_ops, limit, extack);
517 if (IS_ERR(child))
518 return PTR_ERR(child);
519
520 if (child != &noop_qdisc)
521 qdisc_hash_add(child, true);
522 sch_tree_lock(sch);
523
524 qdisc_tree_reduce_backlog(q->qdisc, q->qdisc->q.qlen,
525 q->qdisc->qstats.backlog);
526 qdisc_destroy(q->qdisc);
527 q->qdisc = child;
528
529 q->rehash_interval = msecs_to_jiffies(ctl->rehash_interval);
530 q->warmup_time = msecs_to_jiffies(ctl->warmup_time);
531 q->rehash_time = jiffies;
532 q->limit = limit;
533 q->increment = ctl->increment;
534 q->decrement = ctl->decrement;
535 q->max = ctl->max;
536 q->bin_size = ctl->bin_size;
537 q->penalty_rate = ctl->penalty_rate;
538 q->penalty_burst = ctl->penalty_burst;
539 q->tokens_avail = ctl->penalty_burst;
540 q->token_time = jiffies;
541
542 q->slot = 0;
543 q->double_buffering = false;
544 sfb_zero_all_buckets(q);
545 sfb_init_perturbation(0, q);
546 sfb_init_perturbation(1, q);
547
548 sch_tree_unlock(sch);
549
550 return 0;
551 }
552
553 static int sfb_init(struct Qdisc *sch, struct nlattr *opt,
554 struct netlink_ext_ack *extack)
555 {
556 struct sfb_sched_data *q = qdisc_priv(sch);
557 int err;
558
559 err = tcf_block_get(&q->block, &q->filter_list, sch, extack);
560 if (err)
561 return err;
562
563 q->qdisc = &noop_qdisc;
564 return sfb_change(sch, opt, extack);
565 }
566
567 static int sfb_dump(struct Qdisc *sch, struct sk_buff *skb)
568 {
569 struct sfb_sched_data *q = qdisc_priv(sch);
570 struct nlattr *opts;
571 struct tc_sfb_qopt opt = {
572 .rehash_interval = jiffies_to_msecs(q->rehash_interval),
573 .warmup_time = jiffies_to_msecs(q->warmup_time),
574 .limit = q->limit,
575 .max = q->max,
576 .bin_size = q->bin_size,
577 .increment = q->increment,
578 .decrement = q->decrement,
579 .penalty_rate = q->penalty_rate,
580 .penalty_burst = q->penalty_burst,
581 };
582
583 sch->qstats.backlog = q->qdisc->qstats.backlog;
584 opts = nla_nest_start(skb, TCA_OPTIONS);
585 if (opts == NULL)
586 goto nla_put_failure;
587 if (nla_put(skb, TCA_SFB_PARMS, sizeof(opt), &opt))
588 goto nla_put_failure;
589 return nla_nest_end(skb, opts);
590
591 nla_put_failure:
592 nla_nest_cancel(skb, opts);
593 return -EMSGSIZE;
594 }
595
596 static int sfb_dump_stats(struct Qdisc *sch, struct gnet_dump *d)
597 {
598 struct sfb_sched_data *q = qdisc_priv(sch);
599 struct tc_sfb_xstats st = {
600 .earlydrop = q->stats.earlydrop,
601 .penaltydrop = q->stats.penaltydrop,
602 .bucketdrop = q->stats.bucketdrop,
603 .queuedrop = q->stats.queuedrop,
604 .childdrop = q->stats.childdrop,
605 .marked = q->stats.marked,
606 };
607
608 st.maxqlen = sfb_compute_qlen(&st.maxprob, &st.avgprob, q);
609
610 return gnet_stats_copy_app(d, &st, sizeof(st));
611 }
612
613 static int sfb_dump_class(struct Qdisc *sch, unsigned long cl,
614 struct sk_buff *skb, struct tcmsg *tcm)
615 {
616 return -ENOSYS;
617 }
618
619 static int sfb_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new,
620 struct Qdisc **old, struct netlink_ext_ack *extack)
621 {
622 struct sfb_sched_data *q = qdisc_priv(sch);
623
624 if (new == NULL)
625 new = &noop_qdisc;
626
627 *old = qdisc_replace(sch, new, &q->qdisc);
628 return 0;
629 }
630
631 static struct Qdisc *sfb_leaf(struct Qdisc *sch, unsigned long arg)
632 {
633 struct sfb_sched_data *q = qdisc_priv(sch);
634
635 return q->qdisc;
636 }
637
638 static unsigned long sfb_find(struct Qdisc *sch, u32 classid)
639 {
640 return 1;
641 }
642
643 static void sfb_unbind(struct Qdisc *sch, unsigned long arg)
644 {
645 }
646
647 static int sfb_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
648 struct nlattr **tca, unsigned long *arg,
649 struct netlink_ext_ack *extack)
650 {
651 return -ENOSYS;
652 }
653
654 static int sfb_delete(struct Qdisc *sch, unsigned long cl)
655 {
656 return -ENOSYS;
657 }
658
659 static void sfb_walk(struct Qdisc *sch, struct qdisc_walker *walker)
660 {
661 if (!walker->stop) {
662 if (walker->count >= walker->skip)
663 if (walker->fn(sch, 1, walker) < 0) {
664 walker->stop = 1;
665 return;
666 }
667 walker->count++;
668 }
669 }
670
671 static struct tcf_block *sfb_tcf_block(struct Qdisc *sch, unsigned long cl,
672 struct netlink_ext_ack *extack)
673 {
674 struct sfb_sched_data *q = qdisc_priv(sch);
675
676 if (cl)
677 return NULL;
678 return q->block;
679 }
680
681 static unsigned long sfb_bind(struct Qdisc *sch, unsigned long parent,
682 u32 classid)
683 {
684 return 0;
685 }
686
687
688 static const struct Qdisc_class_ops sfb_class_ops = {
689 .graft = sfb_graft,
690 .leaf = sfb_leaf,
691 .find = sfb_find,
692 .change = sfb_change_class,
693 .delete = sfb_delete,
694 .walk = sfb_walk,
695 .tcf_block = sfb_tcf_block,
696 .bind_tcf = sfb_bind,
697 .unbind_tcf = sfb_unbind,
698 .dump = sfb_dump_class,
699 };
700
701 static struct Qdisc_ops sfb_qdisc_ops __read_mostly = {
702 .id = "sfb",
703 .priv_size = sizeof(struct sfb_sched_data),
704 .cl_ops = &sfb_class_ops,
705 .enqueue = sfb_enqueue,
706 .dequeue = sfb_dequeue,
707 .peek = sfb_peek,
708 .init = sfb_init,
709 .reset = sfb_reset,
710 .destroy = sfb_destroy,
711 .change = sfb_change,
712 .dump = sfb_dump,
713 .dump_stats = sfb_dump_stats,
714 .owner = THIS_MODULE,
715 };
716
717 static int __init sfb_module_init(void)
718 {
719 return register_qdisc(&sfb_qdisc_ops);
720 }
721
722 static void __exit sfb_module_exit(void)
723 {
724 unregister_qdisc(&sfb_qdisc_ops);
725 }
726
727 module_init(sfb_module_init)
728 module_exit(sfb_module_exit)
729
730 MODULE_DESCRIPTION("Stochastic Fair Blue queue discipline");
731 MODULE_AUTHOR("Juliusz Chroboczek");
732 MODULE_AUTHOR("Eric Dumazet");
733 MODULE_LICENSE("GPL");
Linux with added FPC-III support