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 | ||
b7f080cf | 16 | #include <linux/mm.h> |
1da177e4 | 17 | #include <linux/module.h> |
5a0e3ad6 | 18 | #include <linux/slab.h> |
1da177e4 LT |
19 | #include <linux/types.h> |
20 | #include <linux/kernel.h> | |
21 | #include <linux/errno.h> | |
1da177e4 | 22 | #include <linux/skbuff.h> |
78776d3f | 23 | #include <linux/vmalloc.h> |
1da177e4 | 24 | #include <linux/rtnetlink.h> |
90b41a1c | 25 | #include <linux/reciprocal_div.h> |
aec0a40a | 26 | #include <linux/rbtree.h> |
1da177e4 | 27 | |
dc5fc579 | 28 | #include <net/netlink.h> |
1da177e4 | 29 | #include <net/pkt_sched.h> |
e4ae004b | 30 | #include <net/inet_ecn.h> |
1da177e4 | 31 | |
250a65f7 | 32 | #define VERSION "1.3" |
eb229c4c | 33 | |
1da177e4 LT |
34 | /* Network Emulation Queuing algorithm. |
35 | ==================================== | |
36 | ||
37 | Sources: [1] Mark Carson, Darrin Santay, "NIST Net - A Linux-based | |
38 | Network Emulation Tool | |
39 | [2] Luigi Rizzo, DummyNet for FreeBSD | |
40 | ||
41 | ---------------------------------------------------------------- | |
42 | ||
43 | This started out as a simple way to delay outgoing packets to | |
44 | test TCP but has grown to include most of the functionality | |
45 | of a full blown network emulator like NISTnet. It can delay | |
46 | packets and add random jitter (and correlation). The random | |
47 | distribution can be loaded from a table as well to provide | |
48 | normal, Pareto, or experimental curves. Packet loss, | |
49 | duplication, and reordering can also be emulated. | |
50 | ||
51 | This qdisc does not do classification that can be handled in | |
52 | layering other disciplines. It does not need to do bandwidth | |
53 | control either since that can be handled by using token | |
54 | bucket or other rate control. | |
661b7972 | 55 | |
56 | Correlated Loss Generator models | |
57 | ||
58 | Added generation of correlated loss according to the | |
59 | "Gilbert-Elliot" model, a 4-state markov model. | |
60 | ||
61 | References: | |
62 | [1] NetemCLG Home http://netgroup.uniroma2.it/NetemCLG | |
63 | [2] S. Salsano, F. Ludovici, A. Ordine, "Definition of a general | |
64 | and intuitive loss model for packet networks and its implementation | |
65 | in the Netem module in the Linux kernel", available in [1] | |
66 | ||
67 | Authors: Stefano Salsano <stefano.salsano at uniroma2.it | |
68 | Fabio Ludovici <fabio.ludovici at yahoo.it> | |
1da177e4 LT |
69 | */ |
70 | ||
71 | struct netem_sched_data { | |
aec0a40a ED |
72 | /* internal t(ime)fifo qdisc uses t_root and sch->limit */ |
73 | struct rb_root t_root; | |
50612537 ED |
74 | |
75 | /* optional qdisc for classful handling (NULL at netem init) */ | |
1da177e4 | 76 | struct Qdisc *qdisc; |
50612537 | 77 | |
59cb5c67 | 78 | struct qdisc_watchdog watchdog; |
1da177e4 | 79 | |
b407621c SH |
80 | psched_tdiff_t latency; |
81 | psched_tdiff_t jitter; | |
82 | ||
1da177e4 | 83 | u32 loss; |
e4ae004b | 84 | u32 ecn; |
1da177e4 LT |
85 | u32 limit; |
86 | u32 counter; | |
87 | u32 gap; | |
1da177e4 | 88 | u32 duplicate; |
0dca51d3 | 89 | u32 reorder; |
c865e5d9 | 90 | u32 corrupt; |
6a031f67 | 91 | u64 rate; |
90b41a1c HPP |
92 | s32 packet_overhead; |
93 | u32 cell_size; | |
809fa972 | 94 | struct reciprocal_value cell_size_reciprocal; |
90b41a1c | 95 | s32 cell_overhead; |
1da177e4 LT |
96 | |
97 | struct crndstate { | |
b407621c SH |
98 | u32 last; |
99 | u32 rho; | |
c865e5d9 | 100 | } delay_cor, loss_cor, dup_cor, reorder_cor, corrupt_cor; |
1da177e4 LT |
101 | |
102 | struct disttable { | |
103 | u32 size; | |
104 | s16 table[0]; | |
105 | } *delay_dist; | |
661b7972 | 106 | |
107 | enum { | |
108 | CLG_RANDOM, | |
109 | CLG_4_STATES, | |
110 | CLG_GILB_ELL, | |
111 | } loss_model; | |
112 | ||
a6e2fe17 YY |
113 | enum { |
114 | TX_IN_GAP_PERIOD = 1, | |
115 | TX_IN_BURST_PERIOD, | |
116 | LOST_IN_GAP_PERIOD, | |
117 | LOST_IN_BURST_PERIOD, | |
118 | } _4_state_model; | |
119 | ||
c045a734 YY |
120 | enum { |
121 | GOOD_STATE = 1, | |
122 | BAD_STATE, | |
123 | } GE_state_model; | |
124 | ||
661b7972 | 125 | /* Correlated Loss Generation models */ |
126 | struct clgstate { | |
127 | /* state of the Markov chain */ | |
128 | u8 state; | |
129 | ||
130 | /* 4-states and Gilbert-Elliot models */ | |
131 | u32 a1; /* p13 for 4-states or p for GE */ | |
132 | u32 a2; /* p31 for 4-states or r for GE */ | |
133 | u32 a3; /* p32 for 4-states or h for GE */ | |
134 | u32 a4; /* p14 for 4-states or 1-k for GE */ | |
135 | u32 a5; /* p23 used only in 4-states */ | |
136 | } clg; | |
137 | ||
1da177e4 LT |
138 | }; |
139 | ||
50612537 ED |
140 | /* Time stamp put into socket buffer control block |
141 | * Only valid when skbs are in our internal t(ime)fifo queue. | |
142 | */ | |
1da177e4 LT |
143 | struct netem_skb_cb { |
144 | psched_time_t time_to_send; | |
aec0a40a | 145 | ktime_t tstamp_save; |
1da177e4 LT |
146 | }; |
147 | ||
aec0a40a ED |
148 | /* Because space in skb->cb[] is tight, netem overloads skb->next/prev/tstamp |
149 | * to hold a rb_node structure. | |
150 | * | |
151 | * If struct sk_buff layout is changed, the following checks will complain. | |
152 | */ | |
153 | static struct rb_node *netem_rb_node(struct sk_buff *skb) | |
154 | { | |
155 | BUILD_BUG_ON(offsetof(struct sk_buff, next) != 0); | |
156 | BUILD_BUG_ON(offsetof(struct sk_buff, prev) != | |
157 | offsetof(struct sk_buff, next) + sizeof(skb->next)); | |
158 | BUILD_BUG_ON(offsetof(struct sk_buff, tstamp) != | |
159 | offsetof(struct sk_buff, prev) + sizeof(skb->prev)); | |
160 | BUILD_BUG_ON(sizeof(struct rb_node) > sizeof(skb->next) + | |
161 | sizeof(skb->prev) + | |
162 | sizeof(skb->tstamp)); | |
163 | return (struct rb_node *)&skb->next; | |
164 | } | |
165 | ||
166 | static struct sk_buff *netem_rb_to_skb(struct rb_node *rb) | |
167 | { | |
168 | return (struct sk_buff *)rb; | |
169 | } | |
170 | ||
5f86173b JK |
171 | static inline struct netem_skb_cb *netem_skb_cb(struct sk_buff *skb) |
172 | { | |
aec0a40a | 173 | /* we assume we can use skb next/prev/tstamp as storage for rb_node */ |
16bda13d | 174 | qdisc_cb_private_validate(skb, sizeof(struct netem_skb_cb)); |
175f9c1b | 175 | return (struct netem_skb_cb *)qdisc_skb_cb(skb)->data; |
5f86173b JK |
176 | } |
177 | ||
1da177e4 LT |
178 | /* init_crandom - initialize correlated random number generator |
179 | * Use entropy source for initial seed. | |
180 | */ | |
181 | static void init_crandom(struct crndstate *state, unsigned long rho) | |
182 | { | |
183 | state->rho = rho; | |
63862b5b | 184 | state->last = prandom_u32(); |
1da177e4 LT |
185 | } |
186 | ||
187 | /* get_crandom - correlated random number generator | |
188 | * Next number depends on last value. | |
189 | * rho is scaled to avoid floating point. | |
190 | */ | |
b407621c | 191 | static u32 get_crandom(struct crndstate *state) |
1da177e4 LT |
192 | { |
193 | u64 value, rho; | |
194 | unsigned long answer; | |
195 | ||
bb2f8cc0 | 196 | if (state->rho == 0) /* no correlation */ |
63862b5b | 197 | return prandom_u32(); |
1da177e4 | 198 | |
63862b5b | 199 | value = prandom_u32(); |
1da177e4 LT |
200 | rho = (u64)state->rho + 1; |
201 | answer = (value * ((1ull<<32) - rho) + state->last * rho) >> 32; | |
202 | state->last = answer; | |
203 | return answer; | |
204 | } | |
205 | ||
661b7972 | 206 | /* loss_4state - 4-state model loss generator |
207 | * Generates losses according to the 4-state Markov chain adopted in | |
208 | * the GI (General and Intuitive) loss model. | |
209 | */ | |
210 | static bool loss_4state(struct netem_sched_data *q) | |
211 | { | |
212 | struct clgstate *clg = &q->clg; | |
63862b5b | 213 | u32 rnd = prandom_u32(); |
661b7972 | 214 | |
215 | /* | |
25985edc | 216 | * Makes a comparison between rnd and the transition |
661b7972 | 217 | * probabilities outgoing from the current state, then decides the |
218 | * next state and if the next packet has to be transmitted or lost. | |
219 | * The four states correspond to: | |
a6e2fe17 YY |
220 | * TX_IN_GAP_PERIOD => successfully transmitted packets within a gap period |
221 | * LOST_IN_BURST_PERIOD => isolated losses within a gap period | |
222 | * LOST_IN_GAP_PERIOD => lost packets within a burst period | |
223 | * TX_IN_GAP_PERIOD => successfully transmitted packets within a burst period | |
661b7972 | 224 | */ |
225 | switch (clg->state) { | |
a6e2fe17 | 226 | case TX_IN_GAP_PERIOD: |
661b7972 | 227 | if (rnd < clg->a4) { |
a6e2fe17 | 228 | clg->state = LOST_IN_BURST_PERIOD; |
661b7972 | 229 | return true; |
ab6c27be | 230 | } else if (clg->a4 < rnd && rnd < clg->a1 + clg->a4) { |
a6e2fe17 | 231 | clg->state = LOST_IN_GAP_PERIOD; |
661b7972 | 232 | return true; |
a6e2fe17 YY |
233 | } else if (clg->a1 + clg->a4 < rnd) { |
234 | clg->state = TX_IN_GAP_PERIOD; | |
235 | } | |
661b7972 | 236 | |
237 | break; | |
a6e2fe17 | 238 | case TX_IN_BURST_PERIOD: |
661b7972 | 239 | if (rnd < clg->a5) { |
a6e2fe17 | 240 | clg->state = LOST_IN_GAP_PERIOD; |
661b7972 | 241 | return true; |
a6e2fe17 YY |
242 | } else { |
243 | clg->state = TX_IN_BURST_PERIOD; | |
244 | } | |
661b7972 | 245 | |
246 | break; | |
a6e2fe17 | 247 | case LOST_IN_GAP_PERIOD: |
661b7972 | 248 | if (rnd < clg->a3) |
a6e2fe17 | 249 | clg->state = TX_IN_BURST_PERIOD; |
661b7972 | 250 | else if (clg->a3 < rnd && rnd < clg->a2 + clg->a3) { |
a6e2fe17 | 251 | clg->state = TX_IN_GAP_PERIOD; |
661b7972 | 252 | } else if (clg->a2 + clg->a3 < rnd) { |
a6e2fe17 | 253 | clg->state = LOST_IN_GAP_PERIOD; |
661b7972 | 254 | return true; |
255 | } | |
256 | break; | |
a6e2fe17 YY |
257 | case LOST_IN_BURST_PERIOD: |
258 | clg->state = TX_IN_GAP_PERIOD; | |
661b7972 | 259 | break; |
260 | } | |
261 | ||
262 | return false; | |
263 | } | |
264 | ||
265 | /* loss_gilb_ell - Gilbert-Elliot model loss generator | |
266 | * Generates losses according to the Gilbert-Elliot loss model or | |
267 | * its special cases (Gilbert or Simple Gilbert) | |
268 | * | |
25985edc | 269 | * Makes a comparison between random number and the transition |
661b7972 | 270 | * probabilities outgoing from the current state, then decides the |
25985edc | 271 | * next state. A second random number is extracted and the comparison |
661b7972 | 272 | * with the loss probability of the current state decides if the next |
273 | * packet will be transmitted or lost. | |
274 | */ | |
275 | static bool loss_gilb_ell(struct netem_sched_data *q) | |
276 | { | |
277 | struct clgstate *clg = &q->clg; | |
278 | ||
279 | switch (clg->state) { | |
c045a734 | 280 | case GOOD_STATE: |
63862b5b | 281 | if (prandom_u32() < clg->a1) |
c045a734 | 282 | clg->state = BAD_STATE; |
63862b5b | 283 | if (prandom_u32() < clg->a4) |
661b7972 | 284 | return true; |
7c2781fa | 285 | break; |
c045a734 | 286 | case BAD_STATE: |
63862b5b | 287 | if (prandom_u32() < clg->a2) |
c045a734 | 288 | clg->state = GOOD_STATE; |
63862b5b | 289 | if (prandom_u32() > clg->a3) |
661b7972 | 290 | return true; |
291 | } | |
292 | ||
293 | return false; | |
294 | } | |
295 | ||
296 | static bool loss_event(struct netem_sched_data *q) | |
297 | { | |
298 | switch (q->loss_model) { | |
299 | case CLG_RANDOM: | |
300 | /* Random packet drop 0 => none, ~0 => all */ | |
301 | return q->loss && q->loss >= get_crandom(&q->loss_cor); | |
302 | ||
303 | case CLG_4_STATES: | |
304 | /* 4state loss model algorithm (used also for GI model) | |
305 | * Extracts a value from the markov 4 state loss generator, | |
306 | * if it is 1 drops a packet and if needed writes the event in | |
307 | * the kernel logs | |
308 | */ | |
309 | return loss_4state(q); | |
310 | ||
311 | case CLG_GILB_ELL: | |
312 | /* Gilbert-Elliot loss model algorithm | |
313 | * Extracts a value from the Gilbert-Elliot loss generator, | |
314 | * if it is 1 drops a packet and if needed writes the event in | |
315 | * the kernel logs | |
316 | */ | |
317 | return loss_gilb_ell(q); | |
318 | } | |
319 | ||
320 | return false; /* not reached */ | |
321 | } | |
322 | ||
323 | ||
1da177e4 LT |
324 | /* tabledist - return a pseudo-randomly distributed value with mean mu and |
325 | * std deviation sigma. Uses table lookup to approximate the desired | |
326 | * distribution, and a uniformly-distributed pseudo-random source. | |
327 | */ | |
b407621c SH |
328 | static psched_tdiff_t tabledist(psched_tdiff_t mu, psched_tdiff_t sigma, |
329 | struct crndstate *state, | |
330 | const struct disttable *dist) | |
1da177e4 | 331 | { |
b407621c SH |
332 | psched_tdiff_t x; |
333 | long t; | |
334 | u32 rnd; | |
1da177e4 LT |
335 | |
336 | if (sigma == 0) | |
337 | return mu; | |
338 | ||
339 | rnd = get_crandom(state); | |
340 | ||
341 | /* default uniform distribution */ | |
10297b99 | 342 | if (dist == NULL) |
1da177e4 LT |
343 | return (rnd % (2*sigma)) - sigma + mu; |
344 | ||
345 | t = dist->table[rnd % dist->size]; | |
346 | x = (sigma % NETEM_DIST_SCALE) * t; | |
347 | if (x >= 0) | |
348 | x += NETEM_DIST_SCALE/2; | |
349 | else | |
350 | x -= NETEM_DIST_SCALE/2; | |
351 | ||
352 | return x / NETEM_DIST_SCALE + (sigma / NETEM_DIST_SCALE) * t + mu; | |
353 | } | |
354 | ||
90b41a1c | 355 | static psched_time_t packet_len_2_sched_time(unsigned int len, struct netem_sched_data *q) |
7bc0f28c | 356 | { |
90b41a1c | 357 | u64 ticks; |
fc33cc72 | 358 | |
90b41a1c HPP |
359 | len += q->packet_overhead; |
360 | ||
361 | if (q->cell_size) { | |
362 | u32 cells = reciprocal_divide(len, q->cell_size_reciprocal); | |
363 | ||
364 | if (len > cells * q->cell_size) /* extra cell needed for remainder */ | |
365 | cells++; | |
366 | len = cells * (q->cell_size + q->cell_overhead); | |
367 | } | |
368 | ||
369 | ticks = (u64)len * NSEC_PER_SEC; | |
370 | ||
371 | do_div(ticks, q->rate); | |
fc33cc72 | 372 | return PSCHED_NS2TICKS(ticks); |
7bc0f28c HPP |
373 | } |
374 | ||
ff704050 | 375 | static void tfifo_reset(struct Qdisc *sch) |
376 | { | |
377 | struct netem_sched_data *q = qdisc_priv(sch); | |
378 | struct rb_node *p; | |
379 | ||
380 | while ((p = rb_first(&q->t_root))) { | |
381 | struct sk_buff *skb = netem_rb_to_skb(p); | |
382 | ||
383 | rb_erase(p, &q->t_root); | |
384 | skb->next = NULL; | |
385 | skb->prev = NULL; | |
386 | kfree_skb(skb); | |
387 | } | |
388 | } | |
389 | ||
960fb66e | 390 | static void tfifo_enqueue(struct sk_buff *nskb, struct Qdisc *sch) |
50612537 | 391 | { |
aec0a40a | 392 | struct netem_sched_data *q = qdisc_priv(sch); |
50612537 | 393 | psched_time_t tnext = netem_skb_cb(nskb)->time_to_send; |
aec0a40a | 394 | struct rb_node **p = &q->t_root.rb_node, *parent = NULL; |
50612537 | 395 | |
aec0a40a ED |
396 | while (*p) { |
397 | struct sk_buff *skb; | |
50612537 | 398 | |
aec0a40a ED |
399 | parent = *p; |
400 | skb = netem_rb_to_skb(parent); | |
960fb66e | 401 | if (tnext >= netem_skb_cb(skb)->time_to_send) |
aec0a40a ED |
402 | p = &parent->rb_right; |
403 | else | |
404 | p = &parent->rb_left; | |
50612537 | 405 | } |
aec0a40a ED |
406 | rb_link_node(netem_rb_node(nskb), parent, p); |
407 | rb_insert_color(netem_rb_node(nskb), &q->t_root); | |
408 | sch->q.qlen++; | |
50612537 ED |
409 | } |
410 | ||
0afb51e7 SH |
411 | /* |
412 | * Insert one skb into qdisc. | |
413 | * Note: parent depends on return value to account for queue length. | |
414 | * NET_XMIT_DROP: queue length didn't change. | |
415 | * NET_XMIT_SUCCESS: one skb was queued. | |
416 | */ | |
1da177e4 LT |
417 | static int netem_enqueue(struct sk_buff *skb, struct Qdisc *sch) |
418 | { | |
419 | struct netem_sched_data *q = qdisc_priv(sch); | |
89e1df74 GC |
420 | /* We don't fill cb now as skb_unshare() may invalidate it */ |
421 | struct netem_skb_cb *cb; | |
0afb51e7 | 422 | struct sk_buff *skb2; |
0afb51e7 | 423 | int count = 1; |
1da177e4 | 424 | |
0afb51e7 SH |
425 | /* Random duplication */ |
426 | if (q->duplicate && q->duplicate >= get_crandom(&q->dup_cor)) | |
427 | ++count; | |
428 | ||
661b7972 | 429 | /* Drop packet? */ |
e4ae004b ED |
430 | if (loss_event(q)) { |
431 | if (q->ecn && INET_ECN_set_ce(skb)) | |
25331d6c | 432 | qdisc_qstats_drop(sch); /* mark packet */ |
e4ae004b ED |
433 | else |
434 | --count; | |
435 | } | |
0afb51e7 | 436 | if (count == 0) { |
25331d6c | 437 | qdisc_qstats_drop(sch); |
1da177e4 | 438 | kfree_skb(skb); |
c27f339a | 439 | return NET_XMIT_SUCCESS | __NET_XMIT_BYPASS; |
1da177e4 LT |
440 | } |
441 | ||
5a308f40 ED |
442 | /* If a delay is expected, orphan the skb. (orphaning usually takes |
443 | * place at TX completion time, so _before_ the link transit delay) | |
5a308f40 ED |
444 | */ |
445 | if (q->latency || q->jitter) | |
f2f872f9 | 446 | skb_orphan_partial(skb); |
4e8a5201 | 447 | |
0afb51e7 SH |
448 | /* |
449 | * If we need to duplicate packet, then re-insert at top of the | |
450 | * qdisc tree, since parent queuer expects that only one | |
451 | * skb will be queued. | |
452 | */ | |
453 | if (count > 1 && (skb2 = skb_clone(skb, GFP_ATOMIC)) != NULL) { | |
7698b4fc | 454 | struct Qdisc *rootq = qdisc_root(sch); |
0afb51e7 SH |
455 | u32 dupsave = q->duplicate; /* prevent duplicating a dup... */ |
456 | q->duplicate = 0; | |
457 | ||
5f86173b | 458 | qdisc_enqueue_root(skb2, rootq); |
0afb51e7 | 459 | q->duplicate = dupsave; |
1da177e4 LT |
460 | } |
461 | ||
c865e5d9 SH |
462 | /* |
463 | * Randomized packet corruption. | |
464 | * Make copy if needed since we are modifying | |
465 | * If packet is going to be hardware checksummed, then | |
466 | * do it now in software before we mangle it. | |
467 | */ | |
468 | if (q->corrupt && q->corrupt >= get_crandom(&q->corrupt_cor)) { | |
f64f9e71 JP |
469 | if (!(skb = skb_unshare(skb, GFP_ATOMIC)) || |
470 | (skb->ip_summed == CHECKSUM_PARTIAL && | |
116a0fc3 ED |
471 | skb_checksum_help(skb))) |
472 | return qdisc_drop(skb, sch); | |
c865e5d9 | 473 | |
63862b5b AH |
474 | skb->data[prandom_u32() % skb_headlen(skb)] ^= |
475 | 1<<(prandom_u32() % 8); | |
c865e5d9 SH |
476 | } |
477 | ||
960fb66e ED |
478 | if (unlikely(skb_queue_len(&sch->q) >= sch->limit)) |
479 | return qdisc_reshape_fail(skb, sch); | |
480 | ||
25331d6c | 481 | qdisc_qstats_backlog_inc(sch, skb); |
960fb66e | 482 | |
5f86173b | 483 | cb = netem_skb_cb(skb); |
cc7ec456 | 484 | if (q->gap == 0 || /* not doing reordering */ |
a42b4799 | 485 | q->counter < q->gap - 1 || /* inside last reordering gap */ |
f64f9e71 | 486 | q->reorder < get_crandom(&q->reorder_cor)) { |
0f9f32ac | 487 | psched_time_t now; |
07aaa115 SH |
488 | psched_tdiff_t delay; |
489 | ||
490 | delay = tabledist(q->latency, q->jitter, | |
491 | &q->delay_cor, q->delay_dist); | |
492 | ||
3bebcda2 | 493 | now = psched_get_time(); |
7bc0f28c HPP |
494 | |
495 | if (q->rate) { | |
aec0a40a | 496 | struct sk_buff *last; |
7bc0f28c | 497 | |
aec0a40a ED |
498 | if (!skb_queue_empty(&sch->q)) |
499 | last = skb_peek_tail(&sch->q); | |
500 | else | |
501 | last = netem_rb_to_skb(rb_last(&q->t_root)); | |
502 | if (last) { | |
7bc0f28c | 503 | /* |
a13d3104 JN |
504 | * Last packet in queue is reference point (now), |
505 | * calculate this time bonus and subtract | |
7bc0f28c HPP |
506 | * from delay. |
507 | */ | |
aec0a40a | 508 | delay -= netem_skb_cb(last)->time_to_send - now; |
a13d3104 | 509 | delay = max_t(psched_tdiff_t, 0, delay); |
aec0a40a | 510 | now = netem_skb_cb(last)->time_to_send; |
7bc0f28c | 511 | } |
a13d3104 | 512 | |
8cfd88d6 | 513 | delay += packet_len_2_sched_time(qdisc_pkt_len(skb), q); |
7bc0f28c HPP |
514 | } |
515 | ||
7c59e25f | 516 | cb->time_to_send = now + delay; |
aec0a40a | 517 | cb->tstamp_save = skb->tstamp; |
1da177e4 | 518 | ++q->counter; |
960fb66e | 519 | tfifo_enqueue(skb, sch); |
1da177e4 | 520 | } else { |
10297b99 | 521 | /* |
0dca51d3 SH |
522 | * Do re-ordering by putting one out of N packets at the front |
523 | * of the queue. | |
524 | */ | |
3bebcda2 | 525 | cb->time_to_send = psched_get_time(); |
0dca51d3 | 526 | q->counter = 0; |
8ba25dad | 527 | |
50612537 | 528 | __skb_queue_head(&sch->q, skb); |
eb101924 | 529 | sch->qstats.requeues++; |
378a2f09 | 530 | } |
1da177e4 | 531 | |
10f6dfcf | 532 | return NET_XMIT_SUCCESS; |
1da177e4 LT |
533 | } |
534 | ||
cc7ec456 | 535 | static unsigned int netem_drop(struct Qdisc *sch) |
1da177e4 LT |
536 | { |
537 | struct netem_sched_data *q = qdisc_priv(sch); | |
50612537 | 538 | unsigned int len; |
1da177e4 | 539 | |
50612537 | 540 | len = qdisc_queue_drop(sch); |
aec0a40a ED |
541 | |
542 | if (!len) { | |
543 | struct rb_node *p = rb_first(&q->t_root); | |
544 | ||
545 | if (p) { | |
546 | struct sk_buff *skb = netem_rb_to_skb(p); | |
547 | ||
548 | rb_erase(p, &q->t_root); | |
549 | sch->q.qlen--; | |
550 | skb->next = NULL; | |
551 | skb->prev = NULL; | |
25331d6c | 552 | qdisc_qstats_backlog_dec(sch, skb); |
aec0a40a ED |
553 | kfree_skb(skb); |
554 | } | |
555 | } | |
50612537 ED |
556 | if (!len && q->qdisc && q->qdisc->ops->drop) |
557 | len = q->qdisc->ops->drop(q->qdisc); | |
558 | if (len) | |
25331d6c | 559 | qdisc_qstats_drop(sch); |
50612537 | 560 | |
1da177e4 LT |
561 | return len; |
562 | } | |
563 | ||
1da177e4 LT |
564 | static struct sk_buff *netem_dequeue(struct Qdisc *sch) |
565 | { | |
566 | struct netem_sched_data *q = qdisc_priv(sch); | |
567 | struct sk_buff *skb; | |
aec0a40a | 568 | struct rb_node *p; |
1da177e4 | 569 | |
fd245a4a | 570 | if (qdisc_is_throttled(sch)) |
11274e5a SH |
571 | return NULL; |
572 | ||
50612537 | 573 | tfifo_dequeue: |
aec0a40a | 574 | skb = __skb_dequeue(&sch->q); |
771018e7 | 575 | if (skb) { |
aec0a40a | 576 | deliver: |
25331d6c | 577 | qdisc_qstats_backlog_dec(sch, skb); |
aec0a40a ED |
578 | qdisc_unthrottled(sch); |
579 | qdisc_bstats_update(sch, skb); | |
580 | return skb; | |
581 | } | |
582 | p = rb_first(&q->t_root); | |
583 | if (p) { | |
36b7bfe0 ED |
584 | psched_time_t time_to_send; |
585 | ||
aec0a40a | 586 | skb = netem_rb_to_skb(p); |
0f9f32ac SH |
587 | |
588 | /* if more time remaining? */ | |
36b7bfe0 ED |
589 | time_to_send = netem_skb_cb(skb)->time_to_send; |
590 | if (time_to_send <= psched_get_time()) { | |
aec0a40a ED |
591 | rb_erase(p, &q->t_root); |
592 | ||
593 | sch->q.qlen--; | |
594 | skb->next = NULL; | |
595 | skb->prev = NULL; | |
596 | skb->tstamp = netem_skb_cb(skb)->tstamp_save; | |
03c05f0d | 597 | |
8caf1539 JP |
598 | #ifdef CONFIG_NET_CLS_ACT |
599 | /* | |
600 | * If it's at ingress let's pretend the delay is | |
601 | * from the network (tstamp will be updated). | |
602 | */ | |
603 | if (G_TC_FROM(skb->tc_verd) & AT_INGRESS) | |
604 | skb->tstamp.tv64 = 0; | |
605 | #endif | |
10f6dfcf | 606 | |
50612537 ED |
607 | if (q->qdisc) { |
608 | int err = qdisc_enqueue(skb, q->qdisc); | |
609 | ||
610 | if (unlikely(err != NET_XMIT_SUCCESS)) { | |
611 | if (net_xmit_drop_count(err)) { | |
25331d6c | 612 | qdisc_qstats_drop(sch); |
50612537 ED |
613 | qdisc_tree_decrease_qlen(sch, 1); |
614 | } | |
615 | } | |
616 | goto tfifo_dequeue; | |
617 | } | |
aec0a40a | 618 | goto deliver; |
07aaa115 | 619 | } |
11274e5a | 620 | |
50612537 ED |
621 | if (q->qdisc) { |
622 | skb = q->qdisc->ops->dequeue(q->qdisc); | |
623 | if (skb) | |
624 | goto deliver; | |
625 | } | |
36b7bfe0 | 626 | qdisc_watchdog_schedule(&q->watchdog, time_to_send); |
0f9f32ac SH |
627 | } |
628 | ||
50612537 ED |
629 | if (q->qdisc) { |
630 | skb = q->qdisc->ops->dequeue(q->qdisc); | |
631 | if (skb) | |
632 | goto deliver; | |
633 | } | |
0f9f32ac | 634 | return NULL; |
1da177e4 LT |
635 | } |
636 | ||
1da177e4 LT |
637 | static void netem_reset(struct Qdisc *sch) |
638 | { | |
639 | struct netem_sched_data *q = qdisc_priv(sch); | |
640 | ||
50612537 | 641 | qdisc_reset_queue(sch); |
ff704050 | 642 | tfifo_reset(sch); |
50612537 ED |
643 | if (q->qdisc) |
644 | qdisc_reset(q->qdisc); | |
59cb5c67 | 645 | qdisc_watchdog_cancel(&q->watchdog); |
1da177e4 LT |
646 | } |
647 | ||
6373a9a2 | 648 | static void dist_free(struct disttable *d) |
649 | { | |
4cb28970 | 650 | kvfree(d); |
6373a9a2 | 651 | } |
652 | ||
1da177e4 LT |
653 | /* |
654 | * Distribution data is a variable size payload containing | |
655 | * signed 16 bit values. | |
656 | */ | |
1e90474c | 657 | static int get_dist_table(struct Qdisc *sch, const struct nlattr *attr) |
1da177e4 LT |
658 | { |
659 | struct netem_sched_data *q = qdisc_priv(sch); | |
6373a9a2 | 660 | size_t n = nla_len(attr)/sizeof(__s16); |
1e90474c | 661 | const __s16 *data = nla_data(attr); |
7698b4fc | 662 | spinlock_t *root_lock; |
1da177e4 LT |
663 | struct disttable *d; |
664 | int i; | |
6373a9a2 | 665 | size_t s; |
1da177e4 | 666 | |
df173bda | 667 | if (n > NETEM_DIST_MAX) |
1da177e4 LT |
668 | return -EINVAL; |
669 | ||
6373a9a2 | 670 | s = sizeof(struct disttable) + n * sizeof(s16); |
bb52c7ac | 671 | d = kmalloc(s, GFP_KERNEL | __GFP_NOWARN); |
6373a9a2 | 672 | if (!d) |
673 | d = vmalloc(s); | |
1da177e4 LT |
674 | if (!d) |
675 | return -ENOMEM; | |
676 | ||
677 | d->size = n; | |
678 | for (i = 0; i < n; i++) | |
679 | d->table[i] = data[i]; | |
10297b99 | 680 | |
102396ae | 681 | root_lock = qdisc_root_sleeping_lock(sch); |
7698b4fc DM |
682 | |
683 | spin_lock_bh(root_lock); | |
bb52c7ac | 684 | swap(q->delay_dist, d); |
7698b4fc | 685 | spin_unlock_bh(root_lock); |
bb52c7ac ED |
686 | |
687 | dist_free(d); | |
1da177e4 LT |
688 | return 0; |
689 | } | |
690 | ||
49545a77 | 691 | static void get_correlation(struct netem_sched_data *q, const struct nlattr *attr) |
1da177e4 | 692 | { |
1e90474c | 693 | const struct tc_netem_corr *c = nla_data(attr); |
1da177e4 | 694 | |
1da177e4 LT |
695 | init_crandom(&q->delay_cor, c->delay_corr); |
696 | init_crandom(&q->loss_cor, c->loss_corr); | |
697 | init_crandom(&q->dup_cor, c->dup_corr); | |
1da177e4 LT |
698 | } |
699 | ||
49545a77 | 700 | static void get_reorder(struct netem_sched_data *q, const struct nlattr *attr) |
0dca51d3 | 701 | { |
1e90474c | 702 | const struct tc_netem_reorder *r = nla_data(attr); |
0dca51d3 | 703 | |
0dca51d3 SH |
704 | q->reorder = r->probability; |
705 | init_crandom(&q->reorder_cor, r->correlation); | |
0dca51d3 SH |
706 | } |
707 | ||
49545a77 | 708 | static void get_corrupt(struct netem_sched_data *q, const struct nlattr *attr) |
c865e5d9 | 709 | { |
1e90474c | 710 | const struct tc_netem_corrupt *r = nla_data(attr); |
c865e5d9 | 711 | |
c865e5d9 SH |
712 | q->corrupt = r->probability; |
713 | init_crandom(&q->corrupt_cor, r->correlation); | |
c865e5d9 SH |
714 | } |
715 | ||
49545a77 | 716 | static void get_rate(struct netem_sched_data *q, const struct nlattr *attr) |
7bc0f28c | 717 | { |
7bc0f28c HPP |
718 | const struct tc_netem_rate *r = nla_data(attr); |
719 | ||
720 | q->rate = r->rate; | |
90b41a1c HPP |
721 | q->packet_overhead = r->packet_overhead; |
722 | q->cell_size = r->cell_size; | |
809fa972 | 723 | q->cell_overhead = r->cell_overhead; |
90b41a1c HPP |
724 | if (q->cell_size) |
725 | q->cell_size_reciprocal = reciprocal_value(q->cell_size); | |
809fa972 HFS |
726 | else |
727 | q->cell_size_reciprocal = (struct reciprocal_value) { 0 }; | |
7bc0f28c HPP |
728 | } |
729 | ||
49545a77 | 730 | static int get_loss_clg(struct netem_sched_data *q, const struct nlattr *attr) |
661b7972 | 731 | { |
661b7972 | 732 | const struct nlattr *la; |
733 | int rem; | |
734 | ||
735 | nla_for_each_nested(la, attr, rem) { | |
736 | u16 type = nla_type(la); | |
737 | ||
833fa743 | 738 | switch (type) { |
661b7972 | 739 | case NETEM_LOSS_GI: { |
740 | const struct tc_netem_gimodel *gi = nla_data(la); | |
741 | ||
2494654d | 742 | if (nla_len(la) < sizeof(struct tc_netem_gimodel)) { |
661b7972 | 743 | pr_info("netem: incorrect gi model size\n"); |
744 | return -EINVAL; | |
745 | } | |
746 | ||
747 | q->loss_model = CLG_4_STATES; | |
748 | ||
3fbac2a8 | 749 | q->clg.state = TX_IN_GAP_PERIOD; |
661b7972 | 750 | q->clg.a1 = gi->p13; |
751 | q->clg.a2 = gi->p31; | |
752 | q->clg.a3 = gi->p32; | |
753 | q->clg.a4 = gi->p14; | |
754 | q->clg.a5 = gi->p23; | |
755 | break; | |
756 | } | |
757 | ||
758 | case NETEM_LOSS_GE: { | |
759 | const struct tc_netem_gemodel *ge = nla_data(la); | |
760 | ||
2494654d | 761 | if (nla_len(la) < sizeof(struct tc_netem_gemodel)) { |
762 | pr_info("netem: incorrect ge model size\n"); | |
661b7972 | 763 | return -EINVAL; |
764 | } | |
765 | ||
766 | q->loss_model = CLG_GILB_ELL; | |
3fbac2a8 | 767 | q->clg.state = GOOD_STATE; |
661b7972 | 768 | q->clg.a1 = ge->p; |
769 | q->clg.a2 = ge->r; | |
770 | q->clg.a3 = ge->h; | |
771 | q->clg.a4 = ge->k1; | |
772 | break; | |
773 | } | |
774 | ||
775 | default: | |
776 | pr_info("netem: unknown loss type %u\n", type); | |
777 | return -EINVAL; | |
778 | } | |
779 | } | |
780 | ||
781 | return 0; | |
782 | } | |
783 | ||
27a3421e PM |
784 | static const struct nla_policy netem_policy[TCA_NETEM_MAX + 1] = { |
785 | [TCA_NETEM_CORR] = { .len = sizeof(struct tc_netem_corr) }, | |
786 | [TCA_NETEM_REORDER] = { .len = sizeof(struct tc_netem_reorder) }, | |
787 | [TCA_NETEM_CORRUPT] = { .len = sizeof(struct tc_netem_corrupt) }, | |
7bc0f28c | 788 | [TCA_NETEM_RATE] = { .len = sizeof(struct tc_netem_rate) }, |
661b7972 | 789 | [TCA_NETEM_LOSS] = { .type = NLA_NESTED }, |
e4ae004b | 790 | [TCA_NETEM_ECN] = { .type = NLA_U32 }, |
6a031f67 | 791 | [TCA_NETEM_RATE64] = { .type = NLA_U64 }, |
27a3421e PM |
792 | }; |
793 | ||
2c10b32b TG |
794 | static int parse_attr(struct nlattr *tb[], int maxtype, struct nlattr *nla, |
795 | const struct nla_policy *policy, int len) | |
796 | { | |
797 | int nested_len = nla_len(nla) - NLA_ALIGN(len); | |
798 | ||
661b7972 | 799 | if (nested_len < 0) { |
800 | pr_info("netem: invalid attributes len %d\n", nested_len); | |
2c10b32b | 801 | return -EINVAL; |
661b7972 | 802 | } |
803 | ||
2c10b32b TG |
804 | if (nested_len >= nla_attr_size(0)) |
805 | return nla_parse(tb, maxtype, nla_data(nla) + NLA_ALIGN(len), | |
806 | nested_len, policy); | |
661b7972 | 807 | |
2c10b32b TG |
808 | memset(tb, 0, sizeof(struct nlattr *) * (maxtype + 1)); |
809 | return 0; | |
810 | } | |
811 | ||
c865e5d9 | 812 | /* Parse netlink message to set options */ |
1e90474c | 813 | static int netem_change(struct Qdisc *sch, struct nlattr *opt) |
1da177e4 LT |
814 | { |
815 | struct netem_sched_data *q = qdisc_priv(sch); | |
b03f4672 | 816 | struct nlattr *tb[TCA_NETEM_MAX + 1]; |
1da177e4 | 817 | struct tc_netem_qopt *qopt; |
54a4b05c YY |
818 | struct clgstate old_clg; |
819 | int old_loss_model = CLG_RANDOM; | |
1da177e4 | 820 | int ret; |
10297b99 | 821 | |
b03f4672 | 822 | if (opt == NULL) |
1da177e4 LT |
823 | return -EINVAL; |
824 | ||
2c10b32b TG |
825 | qopt = nla_data(opt); |
826 | ret = parse_attr(tb, TCA_NETEM_MAX, opt, netem_policy, sizeof(*qopt)); | |
b03f4672 PM |
827 | if (ret < 0) |
828 | return ret; | |
829 | ||
54a4b05c YY |
830 | /* backup q->clg and q->loss_model */ |
831 | old_clg = q->clg; | |
832 | old_loss_model = q->loss_model; | |
833 | ||
834 | if (tb[TCA_NETEM_LOSS]) { | |
49545a77 | 835 | ret = get_loss_clg(q, tb[TCA_NETEM_LOSS]); |
54a4b05c YY |
836 | if (ret) { |
837 | q->loss_model = old_loss_model; | |
838 | return ret; | |
839 | } | |
840 | } else { | |
841 | q->loss_model = CLG_RANDOM; | |
842 | } | |
843 | ||
844 | if (tb[TCA_NETEM_DELAY_DIST]) { | |
845 | ret = get_dist_table(sch, tb[TCA_NETEM_DELAY_DIST]); | |
846 | if (ret) { | |
847 | /* recover clg and loss_model, in case of | |
848 | * q->clg and q->loss_model were modified | |
849 | * in get_loss_clg() | |
850 | */ | |
851 | q->clg = old_clg; | |
852 | q->loss_model = old_loss_model; | |
853 | return ret; | |
854 | } | |
855 | } | |
856 | ||
50612537 | 857 | sch->limit = qopt->limit; |
10297b99 | 858 | |
1da177e4 LT |
859 | q->latency = qopt->latency; |
860 | q->jitter = qopt->jitter; | |
861 | q->limit = qopt->limit; | |
862 | q->gap = qopt->gap; | |
0dca51d3 | 863 | q->counter = 0; |
1da177e4 LT |
864 | q->loss = qopt->loss; |
865 | q->duplicate = qopt->duplicate; | |
866 | ||
bb2f8cc0 SH |
867 | /* for compatibility with earlier versions. |
868 | * if gap is set, need to assume 100% probability | |
0dca51d3 | 869 | */ |
a362e0a7 SH |
870 | if (q->gap) |
871 | q->reorder = ~0; | |
0dca51d3 | 872 | |
265eb67f | 873 | if (tb[TCA_NETEM_CORR]) |
49545a77 | 874 | get_correlation(q, tb[TCA_NETEM_CORR]); |
1da177e4 | 875 | |
265eb67f | 876 | if (tb[TCA_NETEM_REORDER]) |
49545a77 | 877 | get_reorder(q, tb[TCA_NETEM_REORDER]); |
1da177e4 | 878 | |
265eb67f | 879 | if (tb[TCA_NETEM_CORRUPT]) |
49545a77 | 880 | get_corrupt(q, tb[TCA_NETEM_CORRUPT]); |
1da177e4 | 881 | |
7bc0f28c | 882 | if (tb[TCA_NETEM_RATE]) |
49545a77 | 883 | get_rate(q, tb[TCA_NETEM_RATE]); |
7bc0f28c | 884 | |
6a031f67 YY |
885 | if (tb[TCA_NETEM_RATE64]) |
886 | q->rate = max_t(u64, q->rate, | |
887 | nla_get_u64(tb[TCA_NETEM_RATE64])); | |
888 | ||
e4ae004b ED |
889 | if (tb[TCA_NETEM_ECN]) |
890 | q->ecn = nla_get_u32(tb[TCA_NETEM_ECN]); | |
891 | ||
661b7972 | 892 | return ret; |
1da177e4 LT |
893 | } |
894 | ||
1e90474c | 895 | static int netem_init(struct Qdisc *sch, struct nlattr *opt) |
1da177e4 LT |
896 | { |
897 | struct netem_sched_data *q = qdisc_priv(sch); | |
898 | int ret; | |
899 | ||
900 | if (!opt) | |
901 | return -EINVAL; | |
902 | ||
59cb5c67 | 903 | qdisc_watchdog_init(&q->watchdog, sch); |
1da177e4 | 904 | |
661b7972 | 905 | q->loss_model = CLG_RANDOM; |
1da177e4 | 906 | ret = netem_change(sch, opt); |
50612537 | 907 | if (ret) |
250a65f7 | 908 | pr_info("netem: change failed\n"); |
1da177e4 LT |
909 | return ret; |
910 | } | |
911 | ||
912 | static void netem_destroy(struct Qdisc *sch) | |
913 | { | |
914 | struct netem_sched_data *q = qdisc_priv(sch); | |
915 | ||
59cb5c67 | 916 | qdisc_watchdog_cancel(&q->watchdog); |
50612537 ED |
917 | if (q->qdisc) |
918 | qdisc_destroy(q->qdisc); | |
6373a9a2 | 919 | dist_free(q->delay_dist); |
1da177e4 LT |
920 | } |
921 | ||
661b7972 | 922 | static int dump_loss_model(const struct netem_sched_data *q, |
923 | struct sk_buff *skb) | |
924 | { | |
925 | struct nlattr *nest; | |
926 | ||
927 | nest = nla_nest_start(skb, TCA_NETEM_LOSS); | |
928 | if (nest == NULL) | |
929 | goto nla_put_failure; | |
930 | ||
931 | switch (q->loss_model) { | |
932 | case CLG_RANDOM: | |
933 | /* legacy loss model */ | |
934 | nla_nest_cancel(skb, nest); | |
935 | return 0; /* no data */ | |
936 | ||
937 | case CLG_4_STATES: { | |
938 | struct tc_netem_gimodel gi = { | |
939 | .p13 = q->clg.a1, | |
940 | .p31 = q->clg.a2, | |
941 | .p32 = q->clg.a3, | |
942 | .p14 = q->clg.a4, | |
943 | .p23 = q->clg.a5, | |
944 | }; | |
945 | ||
1b34ec43 DM |
946 | if (nla_put(skb, NETEM_LOSS_GI, sizeof(gi), &gi)) |
947 | goto nla_put_failure; | |
661b7972 | 948 | break; |
949 | } | |
950 | case CLG_GILB_ELL: { | |
951 | struct tc_netem_gemodel ge = { | |
952 | .p = q->clg.a1, | |
953 | .r = q->clg.a2, | |
954 | .h = q->clg.a3, | |
955 | .k1 = q->clg.a4, | |
956 | }; | |
957 | ||
1b34ec43 DM |
958 | if (nla_put(skb, NETEM_LOSS_GE, sizeof(ge), &ge)) |
959 | goto nla_put_failure; | |
661b7972 | 960 | break; |
961 | } | |
962 | } | |
963 | ||
964 | nla_nest_end(skb, nest); | |
965 | return 0; | |
966 | ||
967 | nla_put_failure: | |
968 | nla_nest_cancel(skb, nest); | |
969 | return -1; | |
970 | } | |
971 | ||
1da177e4 LT |
972 | static int netem_dump(struct Qdisc *sch, struct sk_buff *skb) |
973 | { | |
974 | const struct netem_sched_data *q = qdisc_priv(sch); | |
861d7f74 | 975 | struct nlattr *nla = (struct nlattr *) skb_tail_pointer(skb); |
1da177e4 LT |
976 | struct tc_netem_qopt qopt; |
977 | struct tc_netem_corr cor; | |
0dca51d3 | 978 | struct tc_netem_reorder reorder; |
c865e5d9 | 979 | struct tc_netem_corrupt corrupt; |
7bc0f28c | 980 | struct tc_netem_rate rate; |
1da177e4 LT |
981 | |
982 | qopt.latency = q->latency; | |
983 | qopt.jitter = q->jitter; | |
984 | qopt.limit = q->limit; | |
985 | qopt.loss = q->loss; | |
986 | qopt.gap = q->gap; | |
987 | qopt.duplicate = q->duplicate; | |
1b34ec43 DM |
988 | if (nla_put(skb, TCA_OPTIONS, sizeof(qopt), &qopt)) |
989 | goto nla_put_failure; | |
1da177e4 LT |
990 | |
991 | cor.delay_corr = q->delay_cor.rho; | |
992 | cor.loss_corr = q->loss_cor.rho; | |
993 | cor.dup_corr = q->dup_cor.rho; | |
1b34ec43 DM |
994 | if (nla_put(skb, TCA_NETEM_CORR, sizeof(cor), &cor)) |
995 | goto nla_put_failure; | |
0dca51d3 SH |
996 | |
997 | reorder.probability = q->reorder; | |
998 | reorder.correlation = q->reorder_cor.rho; | |
1b34ec43 DM |
999 | if (nla_put(skb, TCA_NETEM_REORDER, sizeof(reorder), &reorder)) |
1000 | goto nla_put_failure; | |
0dca51d3 | 1001 | |
c865e5d9 SH |
1002 | corrupt.probability = q->corrupt; |
1003 | corrupt.correlation = q->corrupt_cor.rho; | |
1b34ec43 DM |
1004 | if (nla_put(skb, TCA_NETEM_CORRUPT, sizeof(corrupt), &corrupt)) |
1005 | goto nla_put_failure; | |
c865e5d9 | 1006 | |
6a031f67 YY |
1007 | if (q->rate >= (1ULL << 32)) { |
1008 | if (nla_put_u64(skb, TCA_NETEM_RATE64, q->rate)) | |
1009 | goto nla_put_failure; | |
1010 | rate.rate = ~0U; | |
1011 | } else { | |
1012 | rate.rate = q->rate; | |
1013 | } | |
90b41a1c HPP |
1014 | rate.packet_overhead = q->packet_overhead; |
1015 | rate.cell_size = q->cell_size; | |
1016 | rate.cell_overhead = q->cell_overhead; | |
1b34ec43 DM |
1017 | if (nla_put(skb, TCA_NETEM_RATE, sizeof(rate), &rate)) |
1018 | goto nla_put_failure; | |
7bc0f28c | 1019 | |
e4ae004b ED |
1020 | if (q->ecn && nla_put_u32(skb, TCA_NETEM_ECN, q->ecn)) |
1021 | goto nla_put_failure; | |
1022 | ||
661b7972 | 1023 | if (dump_loss_model(q, skb) != 0) |
1024 | goto nla_put_failure; | |
1025 | ||
861d7f74 | 1026 | return nla_nest_end(skb, nla); |
1da177e4 | 1027 | |
1e90474c | 1028 | nla_put_failure: |
861d7f74 | 1029 | nlmsg_trim(skb, nla); |
1da177e4 LT |
1030 | return -1; |
1031 | } | |
1032 | ||
10f6dfcf | 1033 | static int netem_dump_class(struct Qdisc *sch, unsigned long cl, |
1034 | struct sk_buff *skb, struct tcmsg *tcm) | |
1035 | { | |
1036 | struct netem_sched_data *q = qdisc_priv(sch); | |
1037 | ||
50612537 | 1038 | if (cl != 1 || !q->qdisc) /* only one class */ |
10f6dfcf | 1039 | return -ENOENT; |
1040 | ||
1041 | tcm->tcm_handle |= TC_H_MIN(1); | |
1042 | tcm->tcm_info = q->qdisc->handle; | |
1043 | ||
1044 | return 0; | |
1045 | } | |
1046 | ||
1047 | static int netem_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new, | |
1048 | struct Qdisc **old) | |
1049 | { | |
1050 | struct netem_sched_data *q = qdisc_priv(sch); | |
1051 | ||
10f6dfcf | 1052 | sch_tree_lock(sch); |
1053 | *old = q->qdisc; | |
1054 | q->qdisc = new; | |
50612537 ED |
1055 | if (*old) { |
1056 | qdisc_tree_decrease_qlen(*old, (*old)->q.qlen); | |
1057 | qdisc_reset(*old); | |
1058 | } | |
10f6dfcf | 1059 | sch_tree_unlock(sch); |
1060 | ||
1061 | return 0; | |
1062 | } | |
1063 | ||
1064 | static struct Qdisc *netem_leaf(struct Qdisc *sch, unsigned long arg) | |
1065 | { | |
1066 | struct netem_sched_data *q = qdisc_priv(sch); | |
1067 | return q->qdisc; | |
1068 | } | |
1069 | ||
1070 | static unsigned long netem_get(struct Qdisc *sch, u32 classid) | |
1071 | { | |
1072 | return 1; | |
1073 | } | |
1074 | ||
1075 | static void netem_put(struct Qdisc *sch, unsigned long arg) | |
1076 | { | |
1077 | } | |
1078 | ||
1079 | static void netem_walk(struct Qdisc *sch, struct qdisc_walker *walker) | |
1080 | { | |
1081 | if (!walker->stop) { | |
1082 | if (walker->count >= walker->skip) | |
1083 | if (walker->fn(sch, 1, walker) < 0) { | |
1084 | walker->stop = 1; | |
1085 | return; | |
1086 | } | |
1087 | walker->count++; | |
1088 | } | |
1089 | } | |
1090 | ||
1091 | static const struct Qdisc_class_ops netem_class_ops = { | |
1092 | .graft = netem_graft, | |
1093 | .leaf = netem_leaf, | |
1094 | .get = netem_get, | |
1095 | .put = netem_put, | |
1096 | .walk = netem_walk, | |
1097 | .dump = netem_dump_class, | |
1098 | }; | |
1099 | ||
20fea08b | 1100 | static struct Qdisc_ops netem_qdisc_ops __read_mostly = { |
1da177e4 | 1101 | .id = "netem", |
10f6dfcf | 1102 | .cl_ops = &netem_class_ops, |
1da177e4 LT |
1103 | .priv_size = sizeof(struct netem_sched_data), |
1104 | .enqueue = netem_enqueue, | |
1105 | .dequeue = netem_dequeue, | |
77be155c | 1106 | .peek = qdisc_peek_dequeued, |
1da177e4 LT |
1107 | .drop = netem_drop, |
1108 | .init = netem_init, | |
1109 | .reset = netem_reset, | |
1110 | .destroy = netem_destroy, | |
1111 | .change = netem_change, | |
1112 | .dump = netem_dump, | |
1113 | .owner = THIS_MODULE, | |
1114 | }; | |
1115 | ||
1116 | ||
1117 | static int __init netem_module_init(void) | |
1118 | { | |
eb229c4c | 1119 | pr_info("netem: version " VERSION "\n"); |
1da177e4 LT |
1120 | return register_qdisc(&netem_qdisc_ops); |
1121 | } | |
1122 | static void __exit netem_module_exit(void) | |
1123 | { | |
1124 | unregister_qdisc(&netem_qdisc_ops); | |
1125 | } | |
1126 | module_init(netem_module_init) | |
1127 | module_exit(netem_module_exit) | |
1128 | MODULE_LICENSE("GPL"); |