Commit | Line | Data |
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1da177e4 LT |
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 | |
798b6b19 | 7 | * 2 of the License. |
1da177e4 LT |
8 | * |
9 | * Many of the algorithms and ideas for this came from | |
10297b99 | 10 | * NIST Net which is not copyrighted. |
1da177e4 LT |
11 | * |
12 | * Authors: Stephen Hemminger <shemminger@osdl.org> | |
13 | * Catalin(ux aka Dino) BOIE <catab at umbrella dot ro> | |
14 | */ | |
15 | ||
1da177e4 | 16 | #include <linux/module.h> |
1da177e4 LT |
17 | #include <linux/types.h> |
18 | #include <linux/kernel.h> | |
19 | #include <linux/errno.h> | |
1da177e4 LT |
20 | #include <linux/skbuff.h> |
21 | #include <linux/rtnetlink.h> | |
22 | ||
dc5fc579 | 23 | #include <net/netlink.h> |
1da177e4 LT |
24 | #include <net/pkt_sched.h> |
25 | ||
c865e5d9 | 26 | #define VERSION "1.2" |
eb229c4c | 27 | |
1da177e4 LT |
28 | /* Network Emulation Queuing algorithm. |
29 | ==================================== | |
30 | ||
31 | Sources: [1] Mark Carson, Darrin Santay, "NIST Net - A Linux-based | |
32 | Network Emulation Tool | |
33 | [2] Luigi Rizzo, DummyNet for FreeBSD | |
34 | ||
35 | ---------------------------------------------------------------- | |
36 | ||
37 | This started out as a simple way to delay outgoing packets to | |
38 | test TCP but has grown to include most of the functionality | |
39 | of a full blown network emulator like NISTnet. It can delay | |
40 | packets and add random jitter (and correlation). The random | |
41 | distribution can be loaded from a table as well to provide | |
42 | normal, Pareto, or experimental curves. Packet loss, | |
43 | duplication, and reordering can also be emulated. | |
44 | ||
45 | This qdisc does not do classification that can be handled in | |
46 | layering other disciplines. It does not need to do bandwidth | |
47 | control either since that can be handled by using token | |
48 | bucket or other rate control. | |
1da177e4 LT |
49 | */ |
50 | ||
51 | struct netem_sched_data { | |
52 | struct Qdisc *qdisc; | |
59cb5c67 | 53 | struct qdisc_watchdog watchdog; |
1da177e4 | 54 | |
b407621c SH |
55 | psched_tdiff_t latency; |
56 | psched_tdiff_t jitter; | |
57 | ||
1da177e4 LT |
58 | u32 loss; |
59 | u32 limit; | |
60 | u32 counter; | |
61 | u32 gap; | |
1da177e4 | 62 | u32 duplicate; |
0dca51d3 | 63 | u32 reorder; |
c865e5d9 | 64 | u32 corrupt; |
1da177e4 LT |
65 | |
66 | struct crndstate { | |
b407621c SH |
67 | u32 last; |
68 | u32 rho; | |
c865e5d9 | 69 | } delay_cor, loss_cor, dup_cor, reorder_cor, corrupt_cor; |
1da177e4 LT |
70 | |
71 | struct disttable { | |
72 | u32 size; | |
73 | s16 table[0]; | |
74 | } *delay_dist; | |
75 | }; | |
76 | ||
77 | /* Time stamp put into socket buffer control block */ | |
78 | struct netem_skb_cb { | |
79 | psched_time_t time_to_send; | |
80 | }; | |
81 | ||
5f86173b JK |
82 | static inline struct netem_skb_cb *netem_skb_cb(struct sk_buff *skb) |
83 | { | |
175f9c1b JK |
84 | BUILD_BUG_ON(sizeof(skb->cb) < |
85 | sizeof(struct qdisc_skb_cb) + sizeof(struct netem_skb_cb)); | |
86 | return (struct netem_skb_cb *)qdisc_skb_cb(skb)->data; | |
5f86173b JK |
87 | } |
88 | ||
1da177e4 LT |
89 | /* init_crandom - initialize correlated random number generator |
90 | * Use entropy source for initial seed. | |
91 | */ | |
92 | static void init_crandom(struct crndstate *state, unsigned long rho) | |
93 | { | |
94 | state->rho = rho; | |
95 | state->last = net_random(); | |
96 | } | |
97 | ||
98 | /* get_crandom - correlated random number generator | |
99 | * Next number depends on last value. | |
100 | * rho is scaled to avoid floating point. | |
101 | */ | |
b407621c | 102 | static u32 get_crandom(struct crndstate *state) |
1da177e4 LT |
103 | { |
104 | u64 value, rho; | |
105 | unsigned long answer; | |
106 | ||
bb2f8cc0 | 107 | if (state->rho == 0) /* no correlation */ |
1da177e4 LT |
108 | return net_random(); |
109 | ||
110 | value = net_random(); | |
111 | rho = (u64)state->rho + 1; | |
112 | answer = (value * ((1ull<<32) - rho) + state->last * rho) >> 32; | |
113 | state->last = answer; | |
114 | return answer; | |
115 | } | |
116 | ||
117 | /* tabledist - return a pseudo-randomly distributed value with mean mu and | |
118 | * std deviation sigma. Uses table lookup to approximate the desired | |
119 | * distribution, and a uniformly-distributed pseudo-random source. | |
120 | */ | |
b407621c SH |
121 | static psched_tdiff_t tabledist(psched_tdiff_t mu, psched_tdiff_t sigma, |
122 | struct crndstate *state, | |
123 | const struct disttable *dist) | |
1da177e4 | 124 | { |
b407621c SH |
125 | psched_tdiff_t x; |
126 | long t; | |
127 | u32 rnd; | |
1da177e4 LT |
128 | |
129 | if (sigma == 0) | |
130 | return mu; | |
131 | ||
132 | rnd = get_crandom(state); | |
133 | ||
134 | /* default uniform distribution */ | |
10297b99 | 135 | if (dist == NULL) |
1da177e4 LT |
136 | return (rnd % (2*sigma)) - sigma + mu; |
137 | ||
138 | t = dist->table[rnd % dist->size]; | |
139 | x = (sigma % NETEM_DIST_SCALE) * t; | |
140 | if (x >= 0) | |
141 | x += NETEM_DIST_SCALE/2; | |
142 | else | |
143 | x -= NETEM_DIST_SCALE/2; | |
144 | ||
145 | return x / NETEM_DIST_SCALE + (sigma / NETEM_DIST_SCALE) * t + mu; | |
146 | } | |
147 | ||
0afb51e7 SH |
148 | /* |
149 | * Insert one skb into qdisc. | |
150 | * Note: parent depends on return value to account for queue length. | |
151 | * NET_XMIT_DROP: queue length didn't change. | |
152 | * NET_XMIT_SUCCESS: one skb was queued. | |
153 | */ | |
1da177e4 LT |
154 | static int netem_enqueue(struct sk_buff *skb, struct Qdisc *sch) |
155 | { | |
156 | struct netem_sched_data *q = qdisc_priv(sch); | |
89e1df74 GC |
157 | /* We don't fill cb now as skb_unshare() may invalidate it */ |
158 | struct netem_skb_cb *cb; | |
0afb51e7 | 159 | struct sk_buff *skb2; |
1da177e4 | 160 | int ret; |
0afb51e7 | 161 | int count = 1; |
1da177e4 | 162 | |
771018e7 | 163 | pr_debug("netem_enqueue skb=%p\n", skb); |
1da177e4 | 164 | |
0afb51e7 SH |
165 | /* Random duplication */ |
166 | if (q->duplicate && q->duplicate >= get_crandom(&q->dup_cor)) | |
167 | ++count; | |
168 | ||
1da177e4 | 169 | /* Random packet drop 0 => none, ~0 => all */ |
0afb51e7 SH |
170 | if (q->loss && q->loss >= get_crandom(&q->loss_cor)) |
171 | --count; | |
172 | ||
173 | if (count == 0) { | |
1da177e4 LT |
174 | sch->qstats.drops++; |
175 | kfree_skb(skb); | |
c27f339a | 176 | return NET_XMIT_SUCCESS | __NET_XMIT_BYPASS; |
1da177e4 LT |
177 | } |
178 | ||
4e8a5201 DM |
179 | skb_orphan(skb); |
180 | ||
0afb51e7 SH |
181 | /* |
182 | * If we need to duplicate packet, then re-insert at top of the | |
183 | * qdisc tree, since parent queuer expects that only one | |
184 | * skb will be queued. | |
185 | */ | |
186 | if (count > 1 && (skb2 = skb_clone(skb, GFP_ATOMIC)) != NULL) { | |
7698b4fc | 187 | struct Qdisc *rootq = qdisc_root(sch); |
0afb51e7 SH |
188 | u32 dupsave = q->duplicate; /* prevent duplicating a dup... */ |
189 | q->duplicate = 0; | |
190 | ||
5f86173b | 191 | qdisc_enqueue_root(skb2, rootq); |
0afb51e7 | 192 | q->duplicate = dupsave; |
1da177e4 LT |
193 | } |
194 | ||
c865e5d9 SH |
195 | /* |
196 | * Randomized packet corruption. | |
197 | * Make copy if needed since we are modifying | |
198 | * If packet is going to be hardware checksummed, then | |
199 | * do it now in software before we mangle it. | |
200 | */ | |
201 | if (q->corrupt && q->corrupt >= get_crandom(&q->corrupt_cor)) { | |
202 | if (!(skb = skb_unshare(skb, GFP_ATOMIC)) | |
84fa7933 PM |
203 | || (skb->ip_summed == CHECKSUM_PARTIAL |
204 | && skb_checksum_help(skb))) { | |
c865e5d9 SH |
205 | sch->qstats.drops++; |
206 | return NET_XMIT_DROP; | |
207 | } | |
208 | ||
209 | skb->data[net_random() % skb_headlen(skb)] ^= 1<<(net_random() % 8); | |
210 | } | |
211 | ||
5f86173b | 212 | cb = netem_skb_cb(skb); |
0dca51d3 SH |
213 | if (q->gap == 0 /* not doing reordering */ |
214 | || q->counter < q->gap /* inside last reordering gap */ | |
215 | || q->reorder < get_crandom(&q->reorder_cor)) { | |
0f9f32ac | 216 | psched_time_t now; |
07aaa115 SH |
217 | psched_tdiff_t delay; |
218 | ||
219 | delay = tabledist(q->latency, q->jitter, | |
220 | &q->delay_cor, q->delay_dist); | |
221 | ||
3bebcda2 | 222 | now = psched_get_time(); |
7c59e25f | 223 | cb->time_to_send = now + delay; |
1da177e4 | 224 | ++q->counter; |
5f86173b | 225 | ret = qdisc_enqueue(skb, q->qdisc); |
1da177e4 | 226 | } else { |
10297b99 | 227 | /* |
0dca51d3 SH |
228 | * Do re-ordering by putting one out of N packets at the front |
229 | * of the queue. | |
230 | */ | |
3bebcda2 | 231 | cb->time_to_send = psched_get_time(); |
0dca51d3 | 232 | q->counter = 0; |
8ba25dad JP |
233 | |
234 | __skb_queue_head(&q->qdisc->q, skb); | |
235 | q->qdisc->qstats.backlog += qdisc_pkt_len(skb); | |
236 | q->qdisc->qstats.requeues++; | |
237 | ret = NET_XMIT_SUCCESS; | |
1da177e4 LT |
238 | } |
239 | ||
240 | if (likely(ret == NET_XMIT_SUCCESS)) { | |
241 | sch->q.qlen++; | |
0abf77e5 | 242 | sch->bstats.bytes += qdisc_pkt_len(skb); |
1da177e4 | 243 | sch->bstats.packets++; |
378a2f09 | 244 | } else if (net_xmit_drop_count(ret)) { |
1da177e4 | 245 | sch->qstats.drops++; |
378a2f09 | 246 | } |
1da177e4 | 247 | |
d5d75cd6 | 248 | pr_debug("netem: enqueue ret %d\n", ret); |
1da177e4 LT |
249 | return ret; |
250 | } | |
251 | ||
1da177e4 LT |
252 | static unsigned int netem_drop(struct Qdisc* sch) |
253 | { | |
254 | struct netem_sched_data *q = qdisc_priv(sch); | |
6d037a26 | 255 | unsigned int len = 0; |
1da177e4 | 256 | |
6d037a26 | 257 | if (q->qdisc->ops->drop && (len = q->qdisc->ops->drop(q->qdisc)) != 0) { |
1da177e4 LT |
258 | sch->q.qlen--; |
259 | sch->qstats.drops++; | |
260 | } | |
261 | return len; | |
262 | } | |
263 | ||
1da177e4 LT |
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 | ||
11274e5a SH |
269 | if (sch->flags & TCQ_F_THROTTLED) |
270 | return NULL; | |
271 | ||
03c05f0d | 272 | skb = q->qdisc->ops->peek(q->qdisc); |
771018e7 | 273 | if (skb) { |
5f86173b | 274 | const struct netem_skb_cb *cb = netem_skb_cb(skb); |
3bebcda2 | 275 | psched_time_t now = psched_get_time(); |
0f9f32ac SH |
276 | |
277 | /* if more time remaining? */ | |
104e0878 | 278 | if (cb->time_to_send <= now) { |
77be155c JP |
279 | skb = qdisc_dequeue_peeked(q->qdisc); |
280 | if (unlikely(!skb)) | |
03c05f0d JP |
281 | return NULL; |
282 | ||
0f9f32ac SH |
283 | pr_debug("netem_dequeue: return skb=%p\n", skb); |
284 | sch->q.qlen--; | |
0f9f32ac | 285 | return skb; |
07aaa115 | 286 | } |
11274e5a | 287 | |
11274e5a | 288 | qdisc_watchdog_schedule(&q->watchdog, cb->time_to_send); |
0f9f32ac SH |
289 | } |
290 | ||
291 | return NULL; | |
1da177e4 LT |
292 | } |
293 | ||
1da177e4 LT |
294 | static void netem_reset(struct Qdisc *sch) |
295 | { | |
296 | struct netem_sched_data *q = qdisc_priv(sch); | |
297 | ||
298 | qdisc_reset(q->qdisc); | |
1da177e4 | 299 | sch->q.qlen = 0; |
59cb5c67 | 300 | qdisc_watchdog_cancel(&q->watchdog); |
1da177e4 LT |
301 | } |
302 | ||
1da177e4 LT |
303 | /* |
304 | * Distribution data is a variable size payload containing | |
305 | * signed 16 bit values. | |
306 | */ | |
1e90474c | 307 | static int get_dist_table(struct Qdisc *sch, const struct nlattr *attr) |
1da177e4 LT |
308 | { |
309 | struct netem_sched_data *q = qdisc_priv(sch); | |
1e90474c PM |
310 | unsigned long n = nla_len(attr)/sizeof(__s16); |
311 | const __s16 *data = nla_data(attr); | |
7698b4fc | 312 | spinlock_t *root_lock; |
1da177e4 LT |
313 | struct disttable *d; |
314 | int i; | |
315 | ||
316 | if (n > 65536) | |
317 | return -EINVAL; | |
318 | ||
319 | d = kmalloc(sizeof(*d) + n*sizeof(d->table[0]), GFP_KERNEL); | |
320 | if (!d) | |
321 | return -ENOMEM; | |
322 | ||
323 | d->size = n; | |
324 | for (i = 0; i < n; i++) | |
325 | d->table[i] = data[i]; | |
10297b99 | 326 | |
102396ae | 327 | root_lock = qdisc_root_sleeping_lock(sch); |
7698b4fc DM |
328 | |
329 | spin_lock_bh(root_lock); | |
b94c8afc PM |
330 | kfree(q->delay_dist); |
331 | q->delay_dist = d; | |
7698b4fc | 332 | spin_unlock_bh(root_lock); |
1da177e4 LT |
333 | return 0; |
334 | } | |
335 | ||
265eb67f | 336 | static void get_correlation(struct Qdisc *sch, const struct nlattr *attr) |
1da177e4 LT |
337 | { |
338 | struct netem_sched_data *q = qdisc_priv(sch); | |
1e90474c | 339 | const struct tc_netem_corr *c = nla_data(attr); |
1da177e4 | 340 | |
1da177e4 LT |
341 | init_crandom(&q->delay_cor, c->delay_corr); |
342 | init_crandom(&q->loss_cor, c->loss_corr); | |
343 | init_crandom(&q->dup_cor, c->dup_corr); | |
1da177e4 LT |
344 | } |
345 | ||
265eb67f | 346 | static void get_reorder(struct Qdisc *sch, const struct nlattr *attr) |
0dca51d3 SH |
347 | { |
348 | struct netem_sched_data *q = qdisc_priv(sch); | |
1e90474c | 349 | const struct tc_netem_reorder *r = nla_data(attr); |
0dca51d3 | 350 | |
0dca51d3 SH |
351 | q->reorder = r->probability; |
352 | init_crandom(&q->reorder_cor, r->correlation); | |
0dca51d3 SH |
353 | } |
354 | ||
265eb67f | 355 | static void get_corrupt(struct Qdisc *sch, const struct nlattr *attr) |
c865e5d9 SH |
356 | { |
357 | struct netem_sched_data *q = qdisc_priv(sch); | |
1e90474c | 358 | const struct tc_netem_corrupt *r = nla_data(attr); |
c865e5d9 | 359 | |
c865e5d9 SH |
360 | q->corrupt = r->probability; |
361 | init_crandom(&q->corrupt_cor, r->correlation); | |
c865e5d9 SH |
362 | } |
363 | ||
27a3421e PM |
364 | static const struct nla_policy netem_policy[TCA_NETEM_MAX + 1] = { |
365 | [TCA_NETEM_CORR] = { .len = sizeof(struct tc_netem_corr) }, | |
366 | [TCA_NETEM_REORDER] = { .len = sizeof(struct tc_netem_reorder) }, | |
367 | [TCA_NETEM_CORRUPT] = { .len = sizeof(struct tc_netem_corrupt) }, | |
368 | }; | |
369 | ||
2c10b32b TG |
370 | static int parse_attr(struct nlattr *tb[], int maxtype, struct nlattr *nla, |
371 | const struct nla_policy *policy, int len) | |
372 | { | |
373 | int nested_len = nla_len(nla) - NLA_ALIGN(len); | |
374 | ||
375 | if (nested_len < 0) | |
376 | return -EINVAL; | |
377 | if (nested_len >= nla_attr_size(0)) | |
378 | return nla_parse(tb, maxtype, nla_data(nla) + NLA_ALIGN(len), | |
379 | nested_len, policy); | |
380 | memset(tb, 0, sizeof(struct nlattr *) * (maxtype + 1)); | |
381 | return 0; | |
382 | } | |
383 | ||
c865e5d9 | 384 | /* Parse netlink message to set options */ |
1e90474c | 385 | static int netem_change(struct Qdisc *sch, struct nlattr *opt) |
1da177e4 LT |
386 | { |
387 | struct netem_sched_data *q = qdisc_priv(sch); | |
b03f4672 | 388 | struct nlattr *tb[TCA_NETEM_MAX + 1]; |
1da177e4 LT |
389 | struct tc_netem_qopt *qopt; |
390 | int ret; | |
10297b99 | 391 | |
b03f4672 | 392 | if (opt == NULL) |
1da177e4 LT |
393 | return -EINVAL; |
394 | ||
2c10b32b TG |
395 | qopt = nla_data(opt); |
396 | ret = parse_attr(tb, TCA_NETEM_MAX, opt, netem_policy, sizeof(*qopt)); | |
b03f4672 PM |
397 | if (ret < 0) |
398 | return ret; | |
399 | ||
fb0305ce | 400 | ret = fifo_set_limit(q->qdisc, qopt->limit); |
1da177e4 LT |
401 | if (ret) { |
402 | pr_debug("netem: can't set fifo limit\n"); | |
403 | return ret; | |
404 | } | |
10297b99 | 405 | |
1da177e4 LT |
406 | q->latency = qopt->latency; |
407 | q->jitter = qopt->jitter; | |
408 | q->limit = qopt->limit; | |
409 | q->gap = qopt->gap; | |
0dca51d3 | 410 | q->counter = 0; |
1da177e4 LT |
411 | q->loss = qopt->loss; |
412 | q->duplicate = qopt->duplicate; | |
413 | ||
bb2f8cc0 SH |
414 | /* for compatibility with earlier versions. |
415 | * if gap is set, need to assume 100% probability | |
0dca51d3 | 416 | */ |
a362e0a7 SH |
417 | if (q->gap) |
418 | q->reorder = ~0; | |
0dca51d3 | 419 | |
265eb67f SH |
420 | if (tb[TCA_NETEM_CORR]) |
421 | get_correlation(sch, tb[TCA_NETEM_CORR]); | |
1da177e4 | 422 | |
b03f4672 PM |
423 | if (tb[TCA_NETEM_DELAY_DIST]) { |
424 | ret = get_dist_table(sch, tb[TCA_NETEM_DELAY_DIST]); | |
425 | if (ret) | |
426 | return ret; | |
427 | } | |
c865e5d9 | 428 | |
265eb67f SH |
429 | if (tb[TCA_NETEM_REORDER]) |
430 | get_reorder(sch, tb[TCA_NETEM_REORDER]); | |
1da177e4 | 431 | |
265eb67f SH |
432 | if (tb[TCA_NETEM_CORRUPT]) |
433 | get_corrupt(sch, tb[TCA_NETEM_CORRUPT]); | |
1da177e4 LT |
434 | |
435 | return 0; | |
436 | } | |
437 | ||
300ce174 SH |
438 | /* |
439 | * Special case version of FIFO queue for use by netem. | |
440 | * It queues in order based on timestamps in skb's | |
441 | */ | |
442 | struct fifo_sched_data { | |
443 | u32 limit; | |
075aa573 | 444 | psched_time_t oldest; |
300ce174 SH |
445 | }; |
446 | ||
447 | static int tfifo_enqueue(struct sk_buff *nskb, struct Qdisc *sch) | |
448 | { | |
449 | struct fifo_sched_data *q = qdisc_priv(sch); | |
450 | struct sk_buff_head *list = &sch->q; | |
5f86173b | 451 | psched_time_t tnext = netem_skb_cb(nskb)->time_to_send; |
300ce174 SH |
452 | struct sk_buff *skb; |
453 | ||
454 | if (likely(skb_queue_len(list) < q->limit)) { | |
075aa573 | 455 | /* Optimize for add at tail */ |
104e0878 | 456 | if (likely(skb_queue_empty(list) || tnext >= q->oldest)) { |
075aa573 SH |
457 | q->oldest = tnext; |
458 | return qdisc_enqueue_tail(nskb, sch); | |
459 | } | |
460 | ||
300ce174 | 461 | skb_queue_reverse_walk(list, skb) { |
5f86173b | 462 | const struct netem_skb_cb *cb = netem_skb_cb(skb); |
300ce174 | 463 | |
104e0878 | 464 | if (tnext >= cb->time_to_send) |
300ce174 SH |
465 | break; |
466 | } | |
467 | ||
468 | __skb_queue_after(list, skb, nskb); | |
469 | ||
0abf77e5 JK |
470 | sch->qstats.backlog += qdisc_pkt_len(nskb); |
471 | sch->bstats.bytes += qdisc_pkt_len(nskb); | |
300ce174 SH |
472 | sch->bstats.packets++; |
473 | ||
474 | return NET_XMIT_SUCCESS; | |
475 | } | |
476 | ||
075aa573 | 477 | return qdisc_reshape_fail(nskb, sch); |
300ce174 SH |
478 | } |
479 | ||
1e90474c | 480 | static int tfifo_init(struct Qdisc *sch, struct nlattr *opt) |
300ce174 SH |
481 | { |
482 | struct fifo_sched_data *q = qdisc_priv(sch); | |
483 | ||
484 | if (opt) { | |
1e90474c PM |
485 | struct tc_fifo_qopt *ctl = nla_data(opt); |
486 | if (nla_len(opt) < sizeof(*ctl)) | |
300ce174 SH |
487 | return -EINVAL; |
488 | ||
489 | q->limit = ctl->limit; | |
490 | } else | |
5ce2d488 | 491 | q->limit = max_t(u32, qdisc_dev(sch)->tx_queue_len, 1); |
300ce174 | 492 | |
a084980d | 493 | q->oldest = PSCHED_PASTPERFECT; |
300ce174 SH |
494 | return 0; |
495 | } | |
496 | ||
497 | static int tfifo_dump(struct Qdisc *sch, struct sk_buff *skb) | |
498 | { | |
499 | struct fifo_sched_data *q = qdisc_priv(sch); | |
500 | struct tc_fifo_qopt opt = { .limit = q->limit }; | |
501 | ||
1e90474c | 502 | NLA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt); |
300ce174 SH |
503 | return skb->len; |
504 | ||
1e90474c | 505 | nla_put_failure: |
300ce174 SH |
506 | return -1; |
507 | } | |
508 | ||
20fea08b | 509 | static struct Qdisc_ops tfifo_qdisc_ops __read_mostly = { |
300ce174 SH |
510 | .id = "tfifo", |
511 | .priv_size = sizeof(struct fifo_sched_data), | |
512 | .enqueue = tfifo_enqueue, | |
513 | .dequeue = qdisc_dequeue_head, | |
8e3af978 | 514 | .peek = qdisc_peek_head, |
300ce174 SH |
515 | .drop = qdisc_queue_drop, |
516 | .init = tfifo_init, | |
517 | .reset = qdisc_reset_queue, | |
518 | .change = tfifo_init, | |
519 | .dump = tfifo_dump, | |
520 | }; | |
521 | ||
1e90474c | 522 | static int netem_init(struct Qdisc *sch, struct nlattr *opt) |
1da177e4 LT |
523 | { |
524 | struct netem_sched_data *q = qdisc_priv(sch); | |
525 | int ret; | |
526 | ||
527 | if (!opt) | |
528 | return -EINVAL; | |
529 | ||
59cb5c67 | 530 | qdisc_watchdog_init(&q->watchdog, sch); |
1da177e4 | 531 | |
5ce2d488 | 532 | q->qdisc = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue, |
bb949fbd | 533 | &tfifo_qdisc_ops, |
9f9afec4 | 534 | TC_H_MAKE(sch->handle, 1)); |
1da177e4 LT |
535 | if (!q->qdisc) { |
536 | pr_debug("netem: qdisc create failed\n"); | |
537 | return -ENOMEM; | |
538 | } | |
539 | ||
540 | ret = netem_change(sch, opt); | |
541 | if (ret) { | |
542 | pr_debug("netem: change failed\n"); | |
543 | qdisc_destroy(q->qdisc); | |
544 | } | |
545 | return ret; | |
546 | } | |
547 | ||
548 | static void netem_destroy(struct Qdisc *sch) | |
549 | { | |
550 | struct netem_sched_data *q = qdisc_priv(sch); | |
551 | ||
59cb5c67 | 552 | qdisc_watchdog_cancel(&q->watchdog); |
1da177e4 LT |
553 | qdisc_destroy(q->qdisc); |
554 | kfree(q->delay_dist); | |
555 | } | |
556 | ||
557 | static int netem_dump(struct Qdisc *sch, struct sk_buff *skb) | |
558 | { | |
559 | const struct netem_sched_data *q = qdisc_priv(sch); | |
27a884dc | 560 | unsigned char *b = skb_tail_pointer(skb); |
1e90474c | 561 | struct nlattr *nla = (struct nlattr *) b; |
1da177e4 LT |
562 | struct tc_netem_qopt qopt; |
563 | struct tc_netem_corr cor; | |
0dca51d3 | 564 | struct tc_netem_reorder reorder; |
c865e5d9 | 565 | struct tc_netem_corrupt corrupt; |
1da177e4 LT |
566 | |
567 | qopt.latency = q->latency; | |
568 | qopt.jitter = q->jitter; | |
569 | qopt.limit = q->limit; | |
570 | qopt.loss = q->loss; | |
571 | qopt.gap = q->gap; | |
572 | qopt.duplicate = q->duplicate; | |
1e90474c | 573 | NLA_PUT(skb, TCA_OPTIONS, sizeof(qopt), &qopt); |
1da177e4 LT |
574 | |
575 | cor.delay_corr = q->delay_cor.rho; | |
576 | cor.loss_corr = q->loss_cor.rho; | |
577 | cor.dup_corr = q->dup_cor.rho; | |
1e90474c | 578 | NLA_PUT(skb, TCA_NETEM_CORR, sizeof(cor), &cor); |
0dca51d3 SH |
579 | |
580 | reorder.probability = q->reorder; | |
581 | reorder.correlation = q->reorder_cor.rho; | |
1e90474c | 582 | NLA_PUT(skb, TCA_NETEM_REORDER, sizeof(reorder), &reorder); |
0dca51d3 | 583 | |
c865e5d9 SH |
584 | corrupt.probability = q->corrupt; |
585 | corrupt.correlation = q->corrupt_cor.rho; | |
1e90474c | 586 | NLA_PUT(skb, TCA_NETEM_CORRUPT, sizeof(corrupt), &corrupt); |
c865e5d9 | 587 | |
1e90474c | 588 | nla->nla_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
589 | |
590 | return skb->len; | |
591 | ||
1e90474c | 592 | nla_put_failure: |
dc5fc579 | 593 | nlmsg_trim(skb, b); |
1da177e4 LT |
594 | return -1; |
595 | } | |
596 | ||
20fea08b | 597 | static struct Qdisc_ops netem_qdisc_ops __read_mostly = { |
1da177e4 | 598 | .id = "netem", |
1da177e4 LT |
599 | .priv_size = sizeof(struct netem_sched_data), |
600 | .enqueue = netem_enqueue, | |
601 | .dequeue = netem_dequeue, | |
77be155c | 602 | .peek = qdisc_peek_dequeued, |
1da177e4 LT |
603 | .drop = netem_drop, |
604 | .init = netem_init, | |
605 | .reset = netem_reset, | |
606 | .destroy = netem_destroy, | |
607 | .change = netem_change, | |
608 | .dump = netem_dump, | |
609 | .owner = THIS_MODULE, | |
610 | }; | |
611 | ||
612 | ||
613 | static int __init netem_module_init(void) | |
614 | { | |
eb229c4c | 615 | pr_info("netem: version " VERSION "\n"); |
1da177e4 LT |
616 | return register_qdisc(&netem_qdisc_ops); |
617 | } | |
618 | static void __exit netem_module_exit(void) | |
619 | { | |
620 | unregister_qdisc(&netem_qdisc_ops); | |
621 | } | |
622 | module_init(netem_module_init) | |
623 | module_exit(netem_module_exit) | |
624 | MODULE_LICENSE("GPL"); |