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Linux 2.6.17.7
[linux/fpc-iii.git] / net / sched / sch_netem.c
blob5a4a4d0ae50226615a3c6661b544e5c333162521
1 /*
2 * net/sched/sch_netem.c Network emulator
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 * Many of the algorithms and ideas for this came from
10 * NIST Net which is not copyrighted.
11 *
12 * Authors: Stephen Hemminger <shemminger@osdl.org>
13 * Catalin(ux aka Dino) BOIE <catab at umbrella dot ro>
14 */
15
16 #include <linux/config.h>
17 #include <linux/module.h>
18 #include <linux/bitops.h>
19 #include <linux/types.h>
20 #include <linux/kernel.h>
21 #include <linux/errno.h>
22 #include <linux/netdevice.h>
23 #include <linux/skbuff.h>
24 #include <linux/rtnetlink.h>
25
26 #include <net/pkt_sched.h>
27
28 #define VERSION "1.2"
29
30 /* Network Emulation Queuing algorithm.
31 ====================================
32
33 Sources: [1] Mark Carson, Darrin Santay, "NIST Net - A Linux-based
34 Network Emulation Tool
35 [2] Luigi Rizzo, DummyNet for FreeBSD
36
37 ----------------------------------------------------------------
38
39 This started out as a simple way to delay outgoing packets to
40 test TCP but has grown to include most of the functionality
41 of a full blown network emulator like NISTnet. It can delay
42 packets and add random jitter (and correlation). The random
43 distribution can be loaded from a table as well to provide
44 normal, Pareto, or experimental curves. Packet loss,
45 duplication, and reordering can also be emulated.
46
47 This qdisc does not do classification that can be handled in
48 layering other disciplines. It does not need to do bandwidth
49 control either since that can be handled by using token
50 bucket or other rate control.
51
52 The simulator is limited by the Linux timer resolution
53 and will create packet bursts on the HZ boundary (1ms).
54 */
55
56 struct netem_sched_data {
57 struct Qdisc *qdisc;
58 struct timer_list timer;
59
60 u32 latency;
61 u32 loss;
62 u32 limit;
63 u32 counter;
64 u32 gap;
65 u32 jitter;
66 u32 duplicate;
67 u32 reorder;
68 u32 corrupt;
69
70 struct crndstate {
71 unsigned long last;
72 unsigned long rho;
73 } delay_cor, loss_cor, dup_cor, reorder_cor, corrupt_cor;
74
75 struct disttable {
76 u32 size;
77 s16 table[0];
78 } *delay_dist;
79 };
80
81 /* Time stamp put into socket buffer control block */
82 struct netem_skb_cb {
83 psched_time_t time_to_send;
84 };
85
86 /* init_crandom - initialize correlated random number generator
87 * Use entropy source for initial seed.
88 */
89 static void init_crandom(struct crndstate *state, unsigned long rho)
90 {
91 state->rho = rho;
92 state->last = net_random();
93 }
94
95 /* get_crandom - correlated random number generator
96 * Next number depends on last value.
97 * rho is scaled to avoid floating point.
98 */
99 static unsigned long get_crandom(struct crndstate *state)
100 {
101 u64 value, rho;
102 unsigned long answer;
103
104 if (state->rho == 0) /* no correllation */
105 return net_random();
106
107 value = net_random();
108 rho = (u64)state->rho + 1;
109 answer = (value * ((1ull<<32) - rho) + state->last * rho) >> 32;
110 state->last = answer;
111 return answer;
112 }
113
114 /* tabledist - return a pseudo-randomly distributed value with mean mu and
115 * std deviation sigma. Uses table lookup to approximate the desired
116 * distribution, and a uniformly-distributed pseudo-random source.
117 */
118 static long tabledist(unsigned long mu, long sigma,
119 struct crndstate *state, const struct disttable *dist)
120 {
121 long t, x;
122 unsigned long rnd;
123
124 if (sigma == 0)
125 return mu;
126
127 rnd = get_crandom(state);
128
129 /* default uniform distribution */
130 if (dist == NULL)
131 return (rnd % (2*sigma)) - sigma + mu;
132
133 t = dist->table[rnd % dist->size];
134 x = (sigma % NETEM_DIST_SCALE) * t;
135 if (x >= 0)
136 x += NETEM_DIST_SCALE/2;
137 else
138 x -= NETEM_DIST_SCALE/2;
139
140 return x / NETEM_DIST_SCALE + (sigma / NETEM_DIST_SCALE) * t + mu;
141 }
142
143 /*
144 * Insert one skb into qdisc.
145 * Note: parent depends on return value to account for queue length.
146 * NET_XMIT_DROP: queue length didn't change.
147 * NET_XMIT_SUCCESS: one skb was queued.
148 */
149 static int netem_enqueue(struct sk_buff *skb, struct Qdisc *sch)
150 {
151 struct netem_sched_data *q = qdisc_priv(sch);
152 struct netem_skb_cb *cb = (struct netem_skb_cb *)skb->cb;
153 struct sk_buff *skb2;
154 int ret;
155 int count = 1;
156
157 pr_debug("netem_enqueue skb=%p\n", skb);
158
159 /* Random duplication */
160 if (q->duplicate && q->duplicate >= get_crandom(&q->dup_cor))
161 ++count;
162
163 /* Random packet drop 0 => none, ~0 => all */
164 if (q->loss && q->loss >= get_crandom(&q->loss_cor))
165 --count;
166
167 if (count == 0) {
168 sch->qstats.drops++;
169 kfree_skb(skb);
170 return NET_XMIT_BYPASS;
171 }
172
173 /*
174 * If we need to duplicate packet, then re-insert at top of the
175 * qdisc tree, since parent queuer expects that only one
176 * skb will be queued.
177 */
178 if (count > 1 && (skb2 = skb_clone(skb, GFP_ATOMIC)) != NULL) {
179 struct Qdisc *rootq = sch->dev->qdisc;
180 u32 dupsave = q->duplicate; /* prevent duplicating a dup... */
181 q->duplicate = 0;
182
183 rootq->enqueue(skb2, rootq);
184 q->duplicate = dupsave;
185 }
186
187 /*
188 * Randomized packet corruption.
189 * Make copy if needed since we are modifying
190 * If packet is going to be hardware checksummed, then
191 * do it now in software before we mangle it.
192 */
193 if (q->corrupt && q->corrupt >= get_crandom(&q->corrupt_cor)) {
194 if (!(skb = skb_unshare(skb, GFP_ATOMIC))
195 || (skb->ip_summed == CHECKSUM_HW
196 && skb_checksum_help(skb, 0))) {
197 sch->qstats.drops++;
198 return NET_XMIT_DROP;
199 }
200
201 skb->data[net_random() % skb_headlen(skb)] ^= 1<<(net_random() % 8);
202 }
203
204 if (q->gap == 0 /* not doing reordering */
205 || q->counter < q->gap /* inside last reordering gap */
206 || q->reorder < get_crandom(&q->reorder_cor)) {
207 psched_time_t now;
208 psched_tdiff_t delay;
209
210 delay = tabledist(q->latency, q->jitter,
211 &q->delay_cor, q->delay_dist);
212
213 PSCHED_GET_TIME(now);
214 PSCHED_TADD2(now, delay, cb->time_to_send);
215 ++q->counter;
216 ret = q->qdisc->enqueue(skb, q->qdisc);
217 } else {
218 /*
219 * Do re-ordering by putting one out of N packets at the front
220 * of the queue.
221 */
222 PSCHED_GET_TIME(cb->time_to_send);
223 q->counter = 0;
224 ret = q->qdisc->ops->requeue(skb, q->qdisc);
225 }
226
227 if (likely(ret == NET_XMIT_SUCCESS)) {
228 sch->q.qlen++;
229 sch->bstats.bytes += skb->len;
230 sch->bstats.packets++;
231 } else
232 sch->qstats.drops++;
233
234 pr_debug("netem: enqueue ret %d\n", ret);
235 return ret;
236 }
237
238 /* Requeue packets but don't change time stamp */
239 static int netem_requeue(struct sk_buff *skb, struct Qdisc *sch)
240 {
241 struct netem_sched_data *q = qdisc_priv(sch);
242 int ret;
243
244 if ((ret = q->qdisc->ops->requeue(skb, q->qdisc)) == 0) {
245 sch->q.qlen++;
246 sch->qstats.requeues++;
247 }
248
249 return ret;
250 }
251
252 static unsigned int netem_drop(struct Qdisc* sch)
253 {
254 struct netem_sched_data *q = qdisc_priv(sch);
255 unsigned int len = 0;
256
257 if (q->qdisc->ops->drop && (len = q->qdisc->ops->drop(q->qdisc)) != 0) {
258 sch->q.qlen--;
259 sch->qstats.drops++;
260 }
261 return len;
262 }
263
264 static struct sk_buff *netem_dequeue(struct Qdisc *sch)
265 {
266 struct netem_sched_data *q = qdisc_priv(sch);
267 struct sk_buff *skb;
268
269 skb = q->qdisc->dequeue(q->qdisc);
270 if (skb) {
271 const struct netem_skb_cb *cb
272 = (const struct netem_skb_cb *)skb->cb;
273 psched_time_t now;
274
275 /* if more time remaining? */
276 PSCHED_GET_TIME(now);
277
278 if (PSCHED_TLESS(cb->time_to_send, now)) {
279 pr_debug("netem_dequeue: return skb=%p\n", skb);
280 sch->q.qlen--;
281 sch->flags &= ~TCQ_F_THROTTLED;
282 return skb;
283 } else {
284 psched_tdiff_t delay = PSCHED_TDIFF(cb->time_to_send, now);
285
286 if (q->qdisc->ops->requeue(skb, q->qdisc) != NET_XMIT_SUCCESS) {
287 sch->qstats.drops++;
288
289 /* After this qlen is confused */
290 printk(KERN_ERR "netem: queue discpline %s could not requeue\n",
291 q->qdisc->ops->id);
292
293 sch->q.qlen--;
294 }
295
296 mod_timer(&q->timer, jiffies + PSCHED_US2JIFFIE(delay));
297 sch->flags |= TCQ_F_THROTTLED;
298 }
299 }
300
301 return NULL;
302 }
303
304 static void netem_watchdog(unsigned long arg)
305 {
306 struct Qdisc *sch = (struct Qdisc *)arg;
307
308 pr_debug("netem_watchdog qlen=%d\n", sch->q.qlen);
309 sch->flags &= ~TCQ_F_THROTTLED;
310 netif_schedule(sch->dev);
311 }
312
313 static void netem_reset(struct Qdisc *sch)
314 {
315 struct netem_sched_data *q = qdisc_priv(sch);
316
317 qdisc_reset(q->qdisc);
318 sch->q.qlen = 0;
319 sch->flags &= ~TCQ_F_THROTTLED;
320 del_timer_sync(&q->timer);
321 }
322
323 /* Pass size change message down to embedded FIFO */
324 static int set_fifo_limit(struct Qdisc *q, int limit)
325 {
326 struct rtattr *rta;
327 int ret = -ENOMEM;
328
329 /* Hack to avoid sending change message to non-FIFO */
330 if (strncmp(q->ops->id + 1, "fifo", 4) != 0)
331 return 0;
332
333 rta = kmalloc(RTA_LENGTH(sizeof(struct tc_fifo_qopt)), GFP_KERNEL);
334 if (rta) {
335 rta->rta_type = RTM_NEWQDISC;
336 rta->rta_len = RTA_LENGTH(sizeof(struct tc_fifo_qopt));
337 ((struct tc_fifo_qopt *)RTA_DATA(rta))->limit = limit;
338
339 ret = q->ops->change(q, rta);
340 kfree(rta);
341 }
342 return ret;
343 }
344
345 /*
346 * Distribution data is a variable size payload containing
347 * signed 16 bit values.
348 */
349 static int get_dist_table(struct Qdisc *sch, const struct rtattr *attr)
350 {
351 struct netem_sched_data *q = qdisc_priv(sch);
352 unsigned long n = RTA_PAYLOAD(attr)/sizeof(__s16);
353 const __s16 *data = RTA_DATA(attr);
354 struct disttable *d;
355 int i;
356
357 if (n > 65536)
358 return -EINVAL;
359
360 d = kmalloc(sizeof(*d) + n*sizeof(d->table[0]), GFP_KERNEL);
361 if (!d)
362 return -ENOMEM;
363
364 d->size = n;
365 for (i = 0; i < n; i++)
366 d->table[i] = data[i];
367
368 spin_lock_bh(&sch->dev->queue_lock);
369 d = xchg(&q->delay_dist, d);
370 spin_unlock_bh(&sch->dev->queue_lock);
371
372 kfree(d);
373 return 0;
374 }
375
376 static int get_correlation(struct Qdisc *sch, const struct rtattr *attr)
377 {
378 struct netem_sched_data *q = qdisc_priv(sch);
379 const struct tc_netem_corr *c = RTA_DATA(attr);
380
381 if (RTA_PAYLOAD(attr) != sizeof(*c))
382 return -EINVAL;
383
384 init_crandom(&q->delay_cor, c->delay_corr);
385 init_crandom(&q->loss_cor, c->loss_corr);
386 init_crandom(&q->dup_cor, c->dup_corr);
387 return 0;
388 }
389
390 static int get_reorder(struct Qdisc *sch, const struct rtattr *attr)
391 {
392 struct netem_sched_data *q = qdisc_priv(sch);
393 const struct tc_netem_reorder *r = RTA_DATA(attr);
394
395 if (RTA_PAYLOAD(attr) != sizeof(*r))
396 return -EINVAL;
397
398 q->reorder = r->probability;
399 init_crandom(&q->reorder_cor, r->correlation);
400 return 0;
401 }
402
403 static int get_corrupt(struct Qdisc *sch, const struct rtattr *attr)
404 {
405 struct netem_sched_data *q = qdisc_priv(sch);
406 const struct tc_netem_corrupt *r = RTA_DATA(attr);
407
408 if (RTA_PAYLOAD(attr) != sizeof(*r))
409 return -EINVAL;
410
411 q->corrupt = r->probability;
412 init_crandom(&q->corrupt_cor, r->correlation);
413 return 0;
414 }
415
416 /* Parse netlink message to set options */
417 static int netem_change(struct Qdisc *sch, struct rtattr *opt)
418 {
419 struct netem_sched_data *q = qdisc_priv(sch);
420 struct tc_netem_qopt *qopt;
421 int ret;
422
423 if (opt == NULL || RTA_PAYLOAD(opt) < sizeof(*qopt))
424 return -EINVAL;
425
426 qopt = RTA_DATA(opt);
427 ret = set_fifo_limit(q->qdisc, qopt->limit);
428 if (ret) {
429 pr_debug("netem: can't set fifo limit\n");
430 return ret;
431 }
432
433 q->latency = qopt->latency;
434 q->jitter = qopt->jitter;
435 q->limit = qopt->limit;
436 q->gap = qopt->gap;
437 q->counter = 0;
438 q->loss = qopt->loss;
439 q->duplicate = qopt->duplicate;
440
441 /* for compatiablity with earlier versions.
442 * if gap is set, need to assume 100% probablity
443 */
444 q->reorder = ~0;
445
446 /* Handle nested options after initial queue options.
447 * Should have put all options in nested format but too late now.
448 */
449 if (RTA_PAYLOAD(opt) > sizeof(*qopt)) {
450 struct rtattr *tb[TCA_NETEM_MAX];
451 if (rtattr_parse(tb, TCA_NETEM_MAX,
452 RTA_DATA(opt) + sizeof(*qopt),
453 RTA_PAYLOAD(opt) - sizeof(*qopt)))
454 return -EINVAL;
455
456 if (tb[TCA_NETEM_CORR-1]) {
457 ret = get_correlation(sch, tb[TCA_NETEM_CORR-1]);
458 if (ret)
459 return ret;
460 }
461
462 if (tb[TCA_NETEM_DELAY_DIST-1]) {
463 ret = get_dist_table(sch, tb[TCA_NETEM_DELAY_DIST-1]);
464 if (ret)
465 return ret;
466 }
467
468 if (tb[TCA_NETEM_REORDER-1]) {
469 ret = get_reorder(sch, tb[TCA_NETEM_REORDER-1]);
470 if (ret)
471 return ret;
472 }
473
474 if (tb[TCA_NETEM_CORRUPT-1]) {
475 ret = get_corrupt(sch, tb[TCA_NETEM_CORRUPT-1]);
476 if (ret)
477 return ret;
478 }
479 }
480
481 return 0;
482 }
483
484 /*
485 * Special case version of FIFO queue for use by netem.
486 * It queues in order based on timestamps in skb's
487 */
488 struct fifo_sched_data {
489 u32 limit;
490 };
491
492 static int tfifo_enqueue(struct sk_buff *nskb, struct Qdisc *sch)
493 {
494 struct fifo_sched_data *q = qdisc_priv(sch);
495 struct sk_buff_head *list = &sch->q;
496 const struct netem_skb_cb *ncb
497 = (const struct netem_skb_cb *)nskb->cb;
498 struct sk_buff *skb;
499
500 if (likely(skb_queue_len(list) < q->limit)) {
501 skb_queue_reverse_walk(list, skb) {
502 const struct netem_skb_cb *cb
503 = (const struct netem_skb_cb *)skb->cb;
504
505 if (!PSCHED_TLESS(ncb->time_to_send, cb->time_to_send))
506 break;
507 }
508
509 __skb_queue_after(list, skb, nskb);
510
511 sch->qstats.backlog += nskb->len;
512 sch->bstats.bytes += nskb->len;
513 sch->bstats.packets++;
514
515 return NET_XMIT_SUCCESS;
516 }
517
518 return qdisc_drop(nskb, sch);
519 }
520
521 static int tfifo_init(struct Qdisc *sch, struct rtattr *opt)
522 {
523 struct fifo_sched_data *q = qdisc_priv(sch);
524
525 if (opt) {
526 struct tc_fifo_qopt *ctl = RTA_DATA(opt);
527 if (RTA_PAYLOAD(opt) < sizeof(*ctl))
528 return -EINVAL;
529
530 q->limit = ctl->limit;
531 } else
532 q->limit = max_t(u32, sch->dev->tx_queue_len, 1);
533
534 return 0;
535 }
536
537 static int tfifo_dump(struct Qdisc *sch, struct sk_buff *skb)
538 {
539 struct fifo_sched_data *q = qdisc_priv(sch);
540 struct tc_fifo_qopt opt = { .limit = q->limit };
541
542 RTA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt);
543 return skb->len;
544
545 rtattr_failure:
546 return -1;
547 }
548
549 static struct Qdisc_ops tfifo_qdisc_ops = {
550 .id = "tfifo",
551 .priv_size = sizeof(struct fifo_sched_data),
552 .enqueue = tfifo_enqueue,
553 .dequeue = qdisc_dequeue_head,
554 .requeue = qdisc_requeue,
555 .drop = qdisc_queue_drop,
556 .init = tfifo_init,
557 .reset = qdisc_reset_queue,
558 .change = tfifo_init,
559 .dump = tfifo_dump,
560 };
561
562 static int netem_init(struct Qdisc *sch, struct rtattr *opt)
563 {
564 struct netem_sched_data *q = qdisc_priv(sch);
565 int ret;
566
567 if (!opt)
568 return -EINVAL;
569
570 init_timer(&q->timer);
571 q->timer.function = netem_watchdog;
572 q->timer.data = (unsigned long) sch;
573
574 q->qdisc = qdisc_create_dflt(sch->dev, &tfifo_qdisc_ops);
575 if (!q->qdisc) {
576 pr_debug("netem: qdisc create failed\n");
577 return -ENOMEM;
578 }
579
580 ret = netem_change(sch, opt);
581 if (ret) {
582 pr_debug("netem: change failed\n");
583 qdisc_destroy(q->qdisc);
584 }
585 return ret;
586 }
587
588 static void netem_destroy(struct Qdisc *sch)
589 {
590 struct netem_sched_data *q = qdisc_priv(sch);
591
592 del_timer_sync(&q->timer);
593 qdisc_destroy(q->qdisc);
594 kfree(q->delay_dist);
595 }
596
597 static int netem_dump(struct Qdisc *sch, struct sk_buff *skb)
598 {
599 const struct netem_sched_data *q = qdisc_priv(sch);
600 unsigned char *b = skb->tail;
601 struct rtattr *rta = (struct rtattr *) b;
602 struct tc_netem_qopt qopt;
603 struct tc_netem_corr cor;
604 struct tc_netem_reorder reorder;
605 struct tc_netem_corrupt corrupt;
606
607 qopt.latency = q->latency;
608 qopt.jitter = q->jitter;
609 qopt.limit = q->limit;
610 qopt.loss = q->loss;
611 qopt.gap = q->gap;
612 qopt.duplicate = q->duplicate;
613 RTA_PUT(skb, TCA_OPTIONS, sizeof(qopt), &qopt);
614
615 cor.delay_corr = q->delay_cor.rho;
616 cor.loss_corr = q->loss_cor.rho;
617 cor.dup_corr = q->dup_cor.rho;
618 RTA_PUT(skb, TCA_NETEM_CORR, sizeof(cor), &cor);
619
620 reorder.probability = q->reorder;
621 reorder.correlation = q->reorder_cor.rho;
622 RTA_PUT(skb, TCA_NETEM_REORDER, sizeof(reorder), &reorder);
623
624 corrupt.probability = q->corrupt;
625 corrupt.correlation = q->corrupt_cor.rho;
626 RTA_PUT(skb, TCA_NETEM_CORRUPT, sizeof(corrupt), &corrupt);
627
628 rta->rta_len = skb->tail - b;
629
630 return skb->len;
631
632 rtattr_failure:
633 skb_trim(skb, b - skb->data);
634 return -1;
635 }
636
637 static int netem_dump_class(struct Qdisc *sch, unsigned long cl,
638 struct sk_buff *skb, struct tcmsg *tcm)
639 {
640 struct netem_sched_data *q = qdisc_priv(sch);
641
642 if (cl != 1) /* only one class */
643 return -ENOENT;
644
645 tcm->tcm_handle |= TC_H_MIN(1);
646 tcm->tcm_info = q->qdisc->handle;
647
648 return 0;
649 }
650
651 static int netem_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new,
652 struct Qdisc **old)
653 {
654 struct netem_sched_data *q = qdisc_priv(sch);
655
656 if (new == NULL)
657 new = &noop_qdisc;
658
659 sch_tree_lock(sch);
660 *old = xchg(&q->qdisc, new);
661 qdisc_reset(*old);
662 sch->q.qlen = 0;
663 sch_tree_unlock(sch);
664
665 return 0;
666 }
667
668 static struct Qdisc *netem_leaf(struct Qdisc *sch, unsigned long arg)
669 {
670 struct netem_sched_data *q = qdisc_priv(sch);
671 return q->qdisc;
672 }
673
674 static unsigned long netem_get(struct Qdisc *sch, u32 classid)
675 {
676 return 1;
677 }
678
679 static void netem_put(struct Qdisc *sch, unsigned long arg)
680 {
681 }
682
683 static int netem_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
684 struct rtattr **tca, unsigned long *arg)
685 {
686 return -ENOSYS;
687 }
688
689 static int netem_delete(struct Qdisc *sch, unsigned long arg)
690 {
691 return -ENOSYS;
692 }
693
694 static void netem_walk(struct Qdisc *sch, struct qdisc_walker *walker)
695 {
696 if (!walker->stop) {
697 if (walker->count >= walker->skip)
698 if (walker->fn(sch, 1, walker) < 0) {
699 walker->stop = 1;
700 return;
701 }
702 walker->count++;
703 }
704 }
705
706 static struct tcf_proto **netem_find_tcf(struct Qdisc *sch, unsigned long cl)
707 {
708 return NULL;
709 }
710
711 static struct Qdisc_class_ops netem_class_ops = {
712 .graft = netem_graft,
713 .leaf = netem_leaf,
714 .get = netem_get,
715 .put = netem_put,
716 .change = netem_change_class,
717 .delete = netem_delete,
718 .walk = netem_walk,
719 .tcf_chain = netem_find_tcf,
720 .dump = netem_dump_class,
721 };
722
723 static struct Qdisc_ops netem_qdisc_ops = {
724 .id = "netem",
725 .cl_ops = &netem_class_ops,
726 .priv_size = sizeof(struct netem_sched_data),
727 .enqueue = netem_enqueue,
728 .dequeue = netem_dequeue,
729 .requeue = netem_requeue,
730 .drop = netem_drop,
731 .init = netem_init,
732 .reset = netem_reset,
733 .destroy = netem_destroy,
734 .change = netem_change,
735 .dump = netem_dump,
736 .owner = THIS_MODULE,
737 };
738
739
740 static int __init netem_module_init(void)
741 {
742 pr_info("netem: version " VERSION "\n");
743 return register_qdisc(&netem_qdisc_ops);
744 }
745 static void __exit netem_module_exit(void)
746 {
747 unregister_qdisc(&netem_qdisc_ops);
748 }
749 module_init(netem_module_init)
750 module_exit(netem_module_exit)
751 MODULE_LICENSE("GPL");
Linux with added FPC-III support