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1da177e4 LT |
1 | /* |
2 | * net/sched/sch_cbq.c Class-Based Queueing discipline. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
10 | * | |
11 | */ | |
12 | ||
1da177e4 | 13 | #include <linux/module.h> |
1da177e4 LT |
14 | #include <linux/types.h> |
15 | #include <linux/kernel.h> | |
1da177e4 | 16 | #include <linux/string.h> |
1da177e4 | 17 | #include <linux/errno.h> |
1da177e4 | 18 | #include <linux/skbuff.h> |
0ba48053 | 19 | #include <net/netlink.h> |
1da177e4 LT |
20 | #include <net/pkt_sched.h> |
21 | ||
22 | ||
23 | /* Class-Based Queueing (CBQ) algorithm. | |
24 | ======================================= | |
25 | ||
26 | Sources: [1] Sally Floyd and Van Jacobson, "Link-sharing and Resource | |
10297b99 | 27 | Management Models for Packet Networks", |
1da177e4 LT |
28 | IEEE/ACM Transactions on Networking, Vol.3, No.4, 1995 |
29 | ||
10297b99 | 30 | [2] Sally Floyd, "Notes on CBQ and Guaranteed Service", 1995 |
1da177e4 | 31 | |
10297b99 | 32 | [3] Sally Floyd, "Notes on Class-Based Queueing: Setting |
1da177e4 LT |
33 | Parameters", 1996 |
34 | ||
35 | [4] Sally Floyd and Michael Speer, "Experimental Results | |
36 | for Class-Based Queueing", 1998, not published. | |
37 | ||
38 | ----------------------------------------------------------------------- | |
39 | ||
40 | Algorithm skeleton was taken from NS simulator cbq.cc. | |
41 | If someone wants to check this code against the LBL version, | |
42 | he should take into account that ONLY the skeleton was borrowed, | |
43 | the implementation is different. Particularly: | |
44 | ||
45 | --- The WRR algorithm is different. Our version looks more | |
10297b99 YH |
46 | reasonable (I hope) and works when quanta are allowed to be |
47 | less than MTU, which is always the case when real time classes | |
48 | have small rates. Note, that the statement of [3] is | |
49 | incomplete, delay may actually be estimated even if class | |
50 | per-round allotment is less than MTU. Namely, if per-round | |
51 | allotment is W*r_i, and r_1+...+r_k = r < 1 | |
1da177e4 LT |
52 | |
53 | delay_i <= ([MTU/(W*r_i)]*W*r + W*r + k*MTU)/B | |
54 | ||
55 | In the worst case we have IntServ estimate with D = W*r+k*MTU | |
56 | and C = MTU*r. The proof (if correct at all) is trivial. | |
57 | ||
58 | ||
59 | --- It seems that cbq-2.0 is not very accurate. At least, I cannot | |
60 | interpret some places, which look like wrong translations | |
61 | from NS. Anyone is advised to find these differences | |
62 | and explain to me, why I am wrong 8). | |
63 | ||
64 | --- Linux has no EOI event, so that we cannot estimate true class | |
65 | idle time. Workaround is to consider the next dequeue event | |
66 | as sign that previous packet is finished. This is wrong because of | |
67 | internal device queueing, but on a permanently loaded link it is true. | |
68 | Moreover, combined with clock integrator, this scheme looks | |
69 | very close to an ideal solution. */ | |
70 | ||
71 | struct cbq_sched_data; | |
72 | ||
73 | ||
74 | struct cbq_class | |
75 | { | |
d77fea2e | 76 | struct Qdisc_class_common common; |
1da177e4 LT |
77 | struct cbq_class *next_alive; /* next class with backlog in this priority band */ |
78 | ||
79 | /* Parameters */ | |
1da177e4 LT |
80 | unsigned char priority; /* class priority */ |
81 | unsigned char priority2; /* priority to be used after overlimit */ | |
82 | unsigned char ewma_log; /* time constant for idle time calculation */ | |
83 | unsigned char ovl_strategy; | |
c3bc7cff | 84 | #ifdef CONFIG_NET_CLS_ACT |
1da177e4 LT |
85 | unsigned char police; |
86 | #endif | |
87 | ||
88 | u32 defmap; | |
89 | ||
90 | /* Link-sharing scheduler parameters */ | |
91 | long maxidle; /* Class parameters: see below. */ | |
92 | long offtime; | |
93 | long minidle; | |
94 | u32 avpkt; | |
95 | struct qdisc_rate_table *R_tab; | |
96 | ||
97 | /* Overlimit strategy parameters */ | |
98 | void (*overlimit)(struct cbq_class *cl); | |
1a13cb63 | 99 | psched_tdiff_t penalty; |
1da177e4 LT |
100 | |
101 | /* General scheduler (WRR) parameters */ | |
102 | long allot; | |
103 | long quantum; /* Allotment per WRR round */ | |
104 | long weight; /* Relative allotment: see below */ | |
105 | ||
106 | struct Qdisc *qdisc; /* Ptr to CBQ discipline */ | |
107 | struct cbq_class *split; /* Ptr to split node */ | |
108 | struct cbq_class *share; /* Ptr to LS parent in the class tree */ | |
109 | struct cbq_class *tparent; /* Ptr to tree parent in the class tree */ | |
110 | struct cbq_class *borrow; /* NULL if class is bandwidth limited; | |
111 | parent otherwise */ | |
112 | struct cbq_class *sibling; /* Sibling chain */ | |
113 | struct cbq_class *children; /* Pointer to children chain */ | |
114 | ||
115 | struct Qdisc *q; /* Elementary queueing discipline */ | |
116 | ||
117 | ||
118 | /* Variables */ | |
119 | unsigned char cpriority; /* Effective priority */ | |
120 | unsigned char delayed; | |
121 | unsigned char level; /* level of the class in hierarchy: | |
122 | 0 for leaf classes, and maximal | |
123 | level of children + 1 for nodes. | |
124 | */ | |
125 | ||
126 | psched_time_t last; /* Last end of service */ | |
127 | psched_time_t undertime; | |
128 | long avgidle; | |
129 | long deficit; /* Saved deficit for WRR */ | |
1a13cb63 | 130 | psched_time_t penalized; |
1da177e4 LT |
131 | struct gnet_stats_basic bstats; |
132 | struct gnet_stats_queue qstats; | |
133 | struct gnet_stats_rate_est rate_est; | |
1da177e4 LT |
134 | struct tc_cbq_xstats xstats; |
135 | ||
136 | struct tcf_proto *filter_list; | |
137 | ||
138 | int refcnt; | |
139 | int filters; | |
140 | ||
141 | struct cbq_class *defaults[TC_PRIO_MAX+1]; | |
142 | }; | |
143 | ||
144 | struct cbq_sched_data | |
145 | { | |
d77fea2e | 146 | struct Qdisc_class_hash clhash; /* Hash table of all classes */ |
1da177e4 LT |
147 | int nclasses[TC_CBQ_MAXPRIO+1]; |
148 | unsigned quanta[TC_CBQ_MAXPRIO+1]; | |
149 | ||
150 | struct cbq_class link; | |
151 | ||
152 | unsigned activemask; | |
153 | struct cbq_class *active[TC_CBQ_MAXPRIO+1]; /* List of all classes | |
154 | with backlog */ | |
155 | ||
c3bc7cff | 156 | #ifdef CONFIG_NET_CLS_ACT |
1da177e4 LT |
157 | struct cbq_class *rx_class; |
158 | #endif | |
159 | struct cbq_class *tx_class; | |
160 | struct cbq_class *tx_borrowed; | |
161 | int tx_len; | |
162 | psched_time_t now; /* Cached timestamp */ | |
163 | psched_time_t now_rt; /* Cached real time */ | |
164 | unsigned pmask; | |
165 | ||
1a13cb63 | 166 | struct hrtimer delay_timer; |
88a99354 | 167 | struct qdisc_watchdog watchdog; /* Watchdog timer, |
1da177e4 LT |
168 | started when CBQ has |
169 | backlog, but cannot | |
170 | transmit just now */ | |
88a99354 | 171 | psched_tdiff_t wd_expires; |
1da177e4 LT |
172 | int toplevel; |
173 | u32 hgenerator; | |
174 | }; | |
175 | ||
176 | ||
e9bef55d | 177 | #define L2T(cl,len) qdisc_l2t((cl)->R_tab,len) |
1da177e4 | 178 | |
1da177e4 LT |
179 | static __inline__ struct cbq_class * |
180 | cbq_class_lookup(struct cbq_sched_data *q, u32 classid) | |
181 | { | |
d77fea2e | 182 | struct Qdisc_class_common *clc; |
1da177e4 | 183 | |
d77fea2e PM |
184 | clc = qdisc_class_find(&q->clhash, classid); |
185 | if (clc == NULL) | |
186 | return NULL; | |
187 | return container_of(clc, struct cbq_class, common); | |
1da177e4 LT |
188 | } |
189 | ||
c3bc7cff | 190 | #ifdef CONFIG_NET_CLS_ACT |
1da177e4 LT |
191 | |
192 | static struct cbq_class * | |
193 | cbq_reclassify(struct sk_buff *skb, struct cbq_class *this) | |
194 | { | |
195 | struct cbq_class *cl, *new; | |
196 | ||
197 | for (cl = this->tparent; cl; cl = cl->tparent) | |
198 | if ((new = cl->defaults[TC_PRIO_BESTEFFORT]) != NULL && new != this) | |
199 | return new; | |
200 | ||
201 | return NULL; | |
202 | } | |
203 | ||
204 | #endif | |
205 | ||
206 | /* Classify packet. The procedure is pretty complicated, but | |
207 | it allows us to combine link sharing and priority scheduling | |
208 | transparently. | |
209 | ||
210 | Namely, you can put link sharing rules (f.e. route based) at root of CBQ, | |
211 | so that it resolves to split nodes. Then packets are classified | |
212 | by logical priority, or a more specific classifier may be attached | |
213 | to the split node. | |
214 | */ | |
215 | ||
216 | static struct cbq_class * | |
217 | cbq_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr) | |
218 | { | |
219 | struct cbq_sched_data *q = qdisc_priv(sch); | |
220 | struct cbq_class *head = &q->link; | |
221 | struct cbq_class **defmap; | |
222 | struct cbq_class *cl = NULL; | |
223 | u32 prio = skb->priority; | |
224 | struct tcf_result res; | |
225 | ||
226 | /* | |
227 | * Step 1. If skb->priority points to one of our classes, use it. | |
228 | */ | |
229 | if (TC_H_MAJ(prio^sch->handle) == 0 && | |
230 | (cl = cbq_class_lookup(q, prio)) != NULL) | |
231 | return cl; | |
232 | ||
29f1df6c | 233 | *qerr = NET_XMIT_BYPASS; |
1da177e4 LT |
234 | for (;;) { |
235 | int result = 0; | |
236 | defmap = head->defaults; | |
237 | ||
238 | /* | |
239 | * Step 2+n. Apply classifier. | |
240 | */ | |
73ca4918 PM |
241 | if (!head->filter_list || |
242 | (result = tc_classify_compat(skb, head->filter_list, &res)) < 0) | |
1da177e4 LT |
243 | goto fallback; |
244 | ||
245 | if ((cl = (void*)res.class) == NULL) { | |
246 | if (TC_H_MAJ(res.classid)) | |
247 | cl = cbq_class_lookup(q, res.classid); | |
248 | else if ((cl = defmap[res.classid&TC_PRIO_MAX]) == NULL) | |
249 | cl = defmap[TC_PRIO_BESTEFFORT]; | |
250 | ||
251 | if (cl == NULL || cl->level >= head->level) | |
252 | goto fallback; | |
253 | } | |
254 | ||
255 | #ifdef CONFIG_NET_CLS_ACT | |
256 | switch (result) { | |
257 | case TC_ACT_QUEUED: | |
10297b99 | 258 | case TC_ACT_STOLEN: |
1da177e4 LT |
259 | *qerr = NET_XMIT_SUCCESS; |
260 | case TC_ACT_SHOT: | |
261 | return NULL; | |
73ca4918 PM |
262 | case TC_ACT_RECLASSIFY: |
263 | return cbq_reclassify(skb, cl); | |
1da177e4 | 264 | } |
1da177e4 LT |
265 | #endif |
266 | if (cl->level == 0) | |
267 | return cl; | |
268 | ||
269 | /* | |
270 | * Step 3+n. If classifier selected a link sharing class, | |
271 | * apply agency specific classifier. | |
272 | * Repeat this procdure until we hit a leaf node. | |
273 | */ | |
274 | head = cl; | |
275 | } | |
276 | ||
277 | fallback: | |
278 | cl = head; | |
279 | ||
280 | /* | |
281 | * Step 4. No success... | |
282 | */ | |
283 | if (TC_H_MAJ(prio) == 0 && | |
284 | !(cl = head->defaults[prio&TC_PRIO_MAX]) && | |
285 | !(cl = head->defaults[TC_PRIO_BESTEFFORT])) | |
286 | return head; | |
287 | ||
288 | return cl; | |
289 | } | |
290 | ||
291 | /* | |
292 | A packet has just been enqueued on the empty class. | |
293 | cbq_activate_class adds it to the tail of active class list | |
294 | of its priority band. | |
295 | */ | |
296 | ||
297 | static __inline__ void cbq_activate_class(struct cbq_class *cl) | |
298 | { | |
299 | struct cbq_sched_data *q = qdisc_priv(cl->qdisc); | |
300 | int prio = cl->cpriority; | |
301 | struct cbq_class *cl_tail; | |
302 | ||
303 | cl_tail = q->active[prio]; | |
304 | q->active[prio] = cl; | |
305 | ||
306 | if (cl_tail != NULL) { | |
307 | cl->next_alive = cl_tail->next_alive; | |
308 | cl_tail->next_alive = cl; | |
309 | } else { | |
310 | cl->next_alive = cl; | |
311 | q->activemask |= (1<<prio); | |
312 | } | |
313 | } | |
314 | ||
315 | /* | |
316 | Unlink class from active chain. | |
317 | Note that this same procedure is done directly in cbq_dequeue* | |
318 | during round-robin procedure. | |
319 | */ | |
320 | ||
321 | static void cbq_deactivate_class(struct cbq_class *this) | |
322 | { | |
323 | struct cbq_sched_data *q = qdisc_priv(this->qdisc); | |
324 | int prio = this->cpriority; | |
325 | struct cbq_class *cl; | |
326 | struct cbq_class *cl_prev = q->active[prio]; | |
327 | ||
328 | do { | |
329 | cl = cl_prev->next_alive; | |
330 | if (cl == this) { | |
331 | cl_prev->next_alive = cl->next_alive; | |
332 | cl->next_alive = NULL; | |
333 | ||
334 | if (cl == q->active[prio]) { | |
335 | q->active[prio] = cl_prev; | |
336 | if (cl == q->active[prio]) { | |
337 | q->active[prio] = NULL; | |
338 | q->activemask &= ~(1<<prio); | |
339 | return; | |
340 | } | |
341 | } | |
1da177e4 LT |
342 | return; |
343 | } | |
344 | } while ((cl_prev = cl) != q->active[prio]); | |
345 | } | |
346 | ||
347 | static void | |
348 | cbq_mark_toplevel(struct cbq_sched_data *q, struct cbq_class *cl) | |
349 | { | |
350 | int toplevel = q->toplevel; | |
351 | ||
352 | if (toplevel > cl->level && !(cl->q->flags&TCQ_F_THROTTLED)) { | |
353 | psched_time_t now; | |
354 | psched_tdiff_t incr; | |
355 | ||
3bebcda2 | 356 | now = psched_get_time(); |
8edc0c31 | 357 | incr = now - q->now_rt; |
7c59e25f | 358 | now = q->now + incr; |
1da177e4 LT |
359 | |
360 | do { | |
104e0878 | 361 | if (cl->undertime < now) { |
1da177e4 LT |
362 | q->toplevel = cl->level; |
363 | return; | |
364 | } | |
365 | } while ((cl=cl->borrow) != NULL && toplevel > cl->level); | |
366 | } | |
367 | } | |
368 | ||
369 | static int | |
370 | cbq_enqueue(struct sk_buff *skb, struct Qdisc *sch) | |
371 | { | |
372 | struct cbq_sched_data *q = qdisc_priv(sch); | |
373 | int len = skb->len; | |
ddeee3ce | 374 | int uninitialized_var(ret); |
1da177e4 LT |
375 | struct cbq_class *cl = cbq_classify(skb, sch, &ret); |
376 | ||
c3bc7cff | 377 | #ifdef CONFIG_NET_CLS_ACT |
1da177e4 LT |
378 | q->rx_class = cl; |
379 | #endif | |
380 | if (cl == NULL) { | |
29f1df6c | 381 | if (ret == NET_XMIT_BYPASS) |
1da177e4 LT |
382 | sch->qstats.drops++; |
383 | kfree_skb(skb); | |
384 | return ret; | |
385 | } | |
386 | ||
c3bc7cff | 387 | #ifdef CONFIG_NET_CLS_ACT |
1da177e4 LT |
388 | cl->q->__parent = sch; |
389 | #endif | |
5f86173b JK |
390 | ret = qdisc_enqueue(skb, cl->q); |
391 | if (ret == NET_XMIT_SUCCESS) { | |
1da177e4 LT |
392 | sch->q.qlen++; |
393 | sch->bstats.packets++; | |
394 | sch->bstats.bytes+=len; | |
395 | cbq_mark_toplevel(q, cl); | |
396 | if (!cl->next_alive) | |
397 | cbq_activate_class(cl); | |
398 | return ret; | |
399 | } | |
400 | ||
401 | sch->qstats.drops++; | |
402 | cbq_mark_toplevel(q, cl); | |
403 | cl->qstats.drops++; | |
404 | return ret; | |
405 | } | |
406 | ||
407 | static int | |
408 | cbq_requeue(struct sk_buff *skb, struct Qdisc *sch) | |
409 | { | |
410 | struct cbq_sched_data *q = qdisc_priv(sch); | |
411 | struct cbq_class *cl; | |
412 | int ret; | |
413 | ||
414 | if ((cl = q->tx_class) == NULL) { | |
415 | kfree_skb(skb); | |
416 | sch->qstats.drops++; | |
417 | return NET_XMIT_CN; | |
418 | } | |
419 | q->tx_class = NULL; | |
420 | ||
421 | cbq_mark_toplevel(q, cl); | |
422 | ||
c3bc7cff | 423 | #ifdef CONFIG_NET_CLS_ACT |
1da177e4 LT |
424 | q->rx_class = cl; |
425 | cl->q->__parent = sch; | |
426 | #endif | |
427 | if ((ret = cl->q->ops->requeue(skb, cl->q)) == 0) { | |
428 | sch->q.qlen++; | |
429 | sch->qstats.requeues++; | |
430 | if (!cl->next_alive) | |
431 | cbq_activate_class(cl); | |
432 | return 0; | |
433 | } | |
434 | sch->qstats.drops++; | |
435 | cl->qstats.drops++; | |
436 | return ret; | |
437 | } | |
438 | ||
439 | /* Overlimit actions */ | |
440 | ||
441 | /* TC_CBQ_OVL_CLASSIC: (default) penalize leaf class by adding offtime */ | |
442 | ||
443 | static void cbq_ovl_classic(struct cbq_class *cl) | |
444 | { | |
445 | struct cbq_sched_data *q = qdisc_priv(cl->qdisc); | |
8edc0c31 | 446 | psched_tdiff_t delay = cl->undertime - q->now; |
1da177e4 LT |
447 | |
448 | if (!cl->delayed) { | |
449 | delay += cl->offtime; | |
450 | ||
10297b99 | 451 | /* |
1da177e4 LT |
452 | Class goes to sleep, so that it will have no |
453 | chance to work avgidle. Let's forgive it 8) | |
454 | ||
455 | BTW cbq-2.0 has a crap in this | |
456 | place, apparently they forgot to shift it by cl->ewma_log. | |
457 | */ | |
458 | if (cl->avgidle < 0) | |
459 | delay -= (-cl->avgidle) - ((-cl->avgidle) >> cl->ewma_log); | |
460 | if (cl->avgidle < cl->minidle) | |
461 | cl->avgidle = cl->minidle; | |
462 | if (delay <= 0) | |
463 | delay = 1; | |
7c59e25f | 464 | cl->undertime = q->now + delay; |
1da177e4 LT |
465 | |
466 | cl->xstats.overactions++; | |
467 | cl->delayed = 1; | |
468 | } | |
469 | if (q->wd_expires == 0 || q->wd_expires > delay) | |
470 | q->wd_expires = delay; | |
471 | ||
472 | /* Dirty work! We must schedule wakeups based on | |
473 | real available rate, rather than leaf rate, | |
474 | which may be tiny (even zero). | |
475 | */ | |
476 | if (q->toplevel == TC_CBQ_MAXLEVEL) { | |
477 | struct cbq_class *b; | |
478 | psched_tdiff_t base_delay = q->wd_expires; | |
479 | ||
480 | for (b = cl->borrow; b; b = b->borrow) { | |
8edc0c31 | 481 | delay = b->undertime - q->now; |
1da177e4 LT |
482 | if (delay < base_delay) { |
483 | if (delay <= 0) | |
484 | delay = 1; | |
485 | base_delay = delay; | |
486 | } | |
487 | } | |
488 | ||
489 | q->wd_expires = base_delay; | |
490 | } | |
491 | } | |
492 | ||
493 | /* TC_CBQ_OVL_RCLASSIC: penalize by offtime classes in hierarchy, when | |
494 | they go overlimit | |
495 | */ | |
496 | ||
497 | static void cbq_ovl_rclassic(struct cbq_class *cl) | |
498 | { | |
499 | struct cbq_sched_data *q = qdisc_priv(cl->qdisc); | |
500 | struct cbq_class *this = cl; | |
501 | ||
502 | do { | |
503 | if (cl->level > q->toplevel) { | |
504 | cl = NULL; | |
505 | break; | |
506 | } | |
507 | } while ((cl = cl->borrow) != NULL); | |
508 | ||
509 | if (cl == NULL) | |
510 | cl = this; | |
511 | cbq_ovl_classic(cl); | |
512 | } | |
513 | ||
514 | /* TC_CBQ_OVL_DELAY: delay until it will go to underlimit */ | |
515 | ||
516 | static void cbq_ovl_delay(struct cbq_class *cl) | |
517 | { | |
518 | struct cbq_sched_data *q = qdisc_priv(cl->qdisc); | |
8edc0c31 | 519 | psched_tdiff_t delay = cl->undertime - q->now; |
1da177e4 LT |
520 | |
521 | if (!cl->delayed) { | |
1a13cb63 PM |
522 | psched_time_t sched = q->now; |
523 | ktime_t expires; | |
1da177e4 LT |
524 | |
525 | delay += cl->offtime; | |
526 | if (cl->avgidle < 0) | |
527 | delay -= (-cl->avgidle) - ((-cl->avgidle) >> cl->ewma_log); | |
528 | if (cl->avgidle < cl->minidle) | |
529 | cl->avgidle = cl->minidle; | |
7c59e25f | 530 | cl->undertime = q->now + delay; |
1da177e4 LT |
531 | |
532 | if (delay > 0) { | |
1a13cb63 | 533 | sched += delay + cl->penalty; |
1da177e4 LT |
534 | cl->penalized = sched; |
535 | cl->cpriority = TC_CBQ_MAXPRIO; | |
536 | q->pmask |= (1<<TC_CBQ_MAXPRIO); | |
1a13cb63 PM |
537 | |
538 | expires = ktime_set(0, 0); | |
539 | expires = ktime_add_ns(expires, PSCHED_US2NS(sched)); | |
540 | if (hrtimer_try_to_cancel(&q->delay_timer) && | |
541 | ktime_to_ns(ktime_sub(q->delay_timer.expires, | |
542 | expires)) > 0) | |
543 | q->delay_timer.expires = expires; | |
544 | hrtimer_restart(&q->delay_timer); | |
1da177e4 LT |
545 | cl->delayed = 1; |
546 | cl->xstats.overactions++; | |
547 | return; | |
548 | } | |
549 | delay = 1; | |
550 | } | |
551 | if (q->wd_expires == 0 || q->wd_expires > delay) | |
552 | q->wd_expires = delay; | |
553 | } | |
554 | ||
555 | /* TC_CBQ_OVL_LOWPRIO: penalize class by lowering its priority band */ | |
556 | ||
557 | static void cbq_ovl_lowprio(struct cbq_class *cl) | |
558 | { | |
559 | struct cbq_sched_data *q = qdisc_priv(cl->qdisc); | |
560 | ||
1a13cb63 | 561 | cl->penalized = q->now + cl->penalty; |
1da177e4 LT |
562 | |
563 | if (cl->cpriority != cl->priority2) { | |
564 | cl->cpriority = cl->priority2; | |
565 | q->pmask |= (1<<cl->cpriority); | |
566 | cl->xstats.overactions++; | |
567 | } | |
568 | cbq_ovl_classic(cl); | |
569 | } | |
570 | ||
571 | /* TC_CBQ_OVL_DROP: penalize class by dropping */ | |
572 | ||
573 | static void cbq_ovl_drop(struct cbq_class *cl) | |
574 | { | |
575 | if (cl->q->ops->drop) | |
576 | if (cl->q->ops->drop(cl->q)) | |
577 | cl->qdisc->q.qlen--; | |
578 | cl->xstats.overactions++; | |
579 | cbq_ovl_classic(cl); | |
580 | } | |
581 | ||
1a13cb63 PM |
582 | static psched_tdiff_t cbq_undelay_prio(struct cbq_sched_data *q, int prio, |
583 | psched_time_t now) | |
1da177e4 LT |
584 | { |
585 | struct cbq_class *cl; | |
586 | struct cbq_class *cl_prev = q->active[prio]; | |
1a13cb63 | 587 | psched_time_t sched = now; |
1da177e4 LT |
588 | |
589 | if (cl_prev == NULL) | |
e9054a33 | 590 | return 0; |
1da177e4 LT |
591 | |
592 | do { | |
593 | cl = cl_prev->next_alive; | |
1a13cb63 | 594 | if (now - cl->penalized > 0) { |
1da177e4 LT |
595 | cl_prev->next_alive = cl->next_alive; |
596 | cl->next_alive = NULL; | |
597 | cl->cpriority = cl->priority; | |
598 | cl->delayed = 0; | |
599 | cbq_activate_class(cl); | |
600 | ||
601 | if (cl == q->active[prio]) { | |
602 | q->active[prio] = cl_prev; | |
603 | if (cl == q->active[prio]) { | |
604 | q->active[prio] = NULL; | |
605 | return 0; | |
606 | } | |
607 | } | |
608 | ||
609 | cl = cl_prev->next_alive; | |
1a13cb63 | 610 | } else if (sched - cl->penalized > 0) |
1da177e4 LT |
611 | sched = cl->penalized; |
612 | } while ((cl_prev = cl) != q->active[prio]); | |
613 | ||
1a13cb63 | 614 | return sched - now; |
1da177e4 LT |
615 | } |
616 | ||
1a13cb63 | 617 | static enum hrtimer_restart cbq_undelay(struct hrtimer *timer) |
1da177e4 | 618 | { |
1a13cb63 PM |
619 | struct cbq_sched_data *q = container_of(timer, struct cbq_sched_data, |
620 | delay_timer); | |
621 | struct Qdisc *sch = q->watchdog.qdisc; | |
622 | psched_time_t now; | |
623 | psched_tdiff_t delay = 0; | |
1da177e4 LT |
624 | unsigned pmask; |
625 | ||
3bebcda2 | 626 | now = psched_get_time(); |
1a13cb63 | 627 | |
1da177e4 LT |
628 | pmask = q->pmask; |
629 | q->pmask = 0; | |
630 | ||
631 | while (pmask) { | |
632 | int prio = ffz(~pmask); | |
1a13cb63 | 633 | psched_tdiff_t tmp; |
1da177e4 LT |
634 | |
635 | pmask &= ~(1<<prio); | |
636 | ||
1a13cb63 | 637 | tmp = cbq_undelay_prio(q, prio, now); |
1da177e4 LT |
638 | if (tmp > 0) { |
639 | q->pmask |= 1<<prio; | |
640 | if (tmp < delay || delay == 0) | |
641 | delay = tmp; | |
642 | } | |
643 | } | |
644 | ||
645 | if (delay) { | |
1a13cb63 PM |
646 | ktime_t time; |
647 | ||
648 | time = ktime_set(0, 0); | |
649 | time = ktime_add_ns(time, PSCHED_US2NS(now + delay)); | |
650 | hrtimer_start(&q->delay_timer, time, HRTIMER_MODE_ABS); | |
1da177e4 LT |
651 | } |
652 | ||
653 | sch->flags &= ~TCQ_F_THROTTLED; | |
37437bb2 | 654 | __netif_schedule(sch); |
1a13cb63 | 655 | return HRTIMER_NORESTART; |
1da177e4 LT |
656 | } |
657 | ||
c3bc7cff | 658 | #ifdef CONFIG_NET_CLS_ACT |
1da177e4 LT |
659 | static int cbq_reshape_fail(struct sk_buff *skb, struct Qdisc *child) |
660 | { | |
661 | int len = skb->len; | |
662 | struct Qdisc *sch = child->__parent; | |
663 | struct cbq_sched_data *q = qdisc_priv(sch); | |
664 | struct cbq_class *cl = q->rx_class; | |
665 | ||
666 | q->rx_class = NULL; | |
667 | ||
668 | if (cl && (cl = cbq_reclassify(skb, cl)) != NULL) { | |
669 | ||
670 | cbq_mark_toplevel(q, cl); | |
671 | ||
672 | q->rx_class = cl; | |
673 | cl->q->__parent = sch; | |
674 | ||
5f86173b | 675 | if (qdisc_enqueue(skb, cl->q) == 0) { |
1da177e4 LT |
676 | sch->q.qlen++; |
677 | sch->bstats.packets++; | |
678 | sch->bstats.bytes+=len; | |
679 | if (!cl->next_alive) | |
680 | cbq_activate_class(cl); | |
681 | return 0; | |
682 | } | |
683 | sch->qstats.drops++; | |
684 | return 0; | |
685 | } | |
686 | ||
687 | sch->qstats.drops++; | |
688 | return -1; | |
689 | } | |
690 | #endif | |
691 | ||
10297b99 | 692 | /* |
1da177e4 LT |
693 | It is mission critical procedure. |
694 | ||
695 | We "regenerate" toplevel cutoff, if transmitting class | |
696 | has backlog and it is not regulated. It is not part of | |
697 | original CBQ description, but looks more reasonable. | |
698 | Probably, it is wrong. This question needs further investigation. | |
699 | */ | |
700 | ||
701 | static __inline__ void | |
702 | cbq_update_toplevel(struct cbq_sched_data *q, struct cbq_class *cl, | |
703 | struct cbq_class *borrowed) | |
704 | { | |
705 | if (cl && q->toplevel >= borrowed->level) { | |
706 | if (cl->q->q.qlen > 1) { | |
707 | do { | |
a084980d | 708 | if (borrowed->undertime == PSCHED_PASTPERFECT) { |
1da177e4 LT |
709 | q->toplevel = borrowed->level; |
710 | return; | |
711 | } | |
712 | } while ((borrowed=borrowed->borrow) != NULL); | |
713 | } | |
10297b99 | 714 | #if 0 |
1da177e4 LT |
715 | /* It is not necessary now. Uncommenting it |
716 | will save CPU cycles, but decrease fairness. | |
717 | */ | |
718 | q->toplevel = TC_CBQ_MAXLEVEL; | |
719 | #endif | |
720 | } | |
721 | } | |
722 | ||
723 | static void | |
724 | cbq_update(struct cbq_sched_data *q) | |
725 | { | |
726 | struct cbq_class *this = q->tx_class; | |
727 | struct cbq_class *cl = this; | |
728 | int len = q->tx_len; | |
729 | ||
730 | q->tx_class = NULL; | |
731 | ||
732 | for ( ; cl; cl = cl->share) { | |
733 | long avgidle = cl->avgidle; | |
734 | long idle; | |
735 | ||
736 | cl->bstats.packets++; | |
737 | cl->bstats.bytes += len; | |
738 | ||
739 | /* | |
740 | (now - last) is total time between packet right edges. | |
741 | (last_pktlen/rate) is "virtual" busy time, so that | |
742 | ||
10297b99 | 743 | idle = (now - last) - last_pktlen/rate |
1da177e4 LT |
744 | */ |
745 | ||
8edc0c31 | 746 | idle = q->now - cl->last; |
1da177e4 LT |
747 | if ((unsigned long)idle > 128*1024*1024) { |
748 | avgidle = cl->maxidle; | |
749 | } else { | |
750 | idle -= L2T(cl, len); | |
751 | ||
752 | /* true_avgidle := (1-W)*true_avgidle + W*idle, | |
753 | where W=2^{-ewma_log}. But cl->avgidle is scaled: | |
754 | cl->avgidle == true_avgidle/W, | |
755 | hence: | |
756 | */ | |
757 | avgidle += idle - (avgidle>>cl->ewma_log); | |
758 | } | |
759 | ||
760 | if (avgidle <= 0) { | |
761 | /* Overlimit or at-limit */ | |
762 | ||
763 | if (avgidle < cl->minidle) | |
764 | avgidle = cl->minidle; | |
765 | ||
766 | cl->avgidle = avgidle; | |
767 | ||
768 | /* Calculate expected time, when this class | |
769 | will be allowed to send. | |
770 | It will occur, when: | |
771 | (1-W)*true_avgidle + W*delay = 0, i.e. | |
772 | idle = (1/W - 1)*(-true_avgidle) | |
773 | or | |
774 | idle = (1 - W)*(-cl->avgidle); | |
775 | */ | |
776 | idle = (-avgidle) - ((-avgidle) >> cl->ewma_log); | |
777 | ||
778 | /* | |
779 | That is not all. | |
780 | To maintain the rate allocated to the class, | |
781 | we add to undertime virtual clock, | |
782 | necessary to complete transmitted packet. | |
783 | (len/phys_bandwidth has been already passed | |
784 | to the moment of cbq_update) | |
785 | */ | |
786 | ||
787 | idle -= L2T(&q->link, len); | |
788 | idle += L2T(cl, len); | |
789 | ||
7c59e25f | 790 | cl->undertime = q->now + idle; |
1da177e4 LT |
791 | } else { |
792 | /* Underlimit */ | |
793 | ||
a084980d | 794 | cl->undertime = PSCHED_PASTPERFECT; |
1da177e4 LT |
795 | if (avgidle > cl->maxidle) |
796 | cl->avgidle = cl->maxidle; | |
797 | else | |
798 | cl->avgidle = avgidle; | |
799 | } | |
800 | cl->last = q->now; | |
801 | } | |
802 | ||
803 | cbq_update_toplevel(q, this, q->tx_borrowed); | |
804 | } | |
805 | ||
806 | static __inline__ struct cbq_class * | |
807 | cbq_under_limit(struct cbq_class *cl) | |
808 | { | |
809 | struct cbq_sched_data *q = qdisc_priv(cl->qdisc); | |
810 | struct cbq_class *this_cl = cl; | |
811 | ||
812 | if (cl->tparent == NULL) | |
813 | return cl; | |
814 | ||
a084980d | 815 | if (cl->undertime == PSCHED_PASTPERFECT || q->now >= cl->undertime) { |
1da177e4 LT |
816 | cl->delayed = 0; |
817 | return cl; | |
818 | } | |
819 | ||
820 | do { | |
821 | /* It is very suspicious place. Now overlimit | |
822 | action is generated for not bounded classes | |
823 | only if link is completely congested. | |
824 | Though it is in agree with ancestor-only paradigm, | |
825 | it looks very stupid. Particularly, | |
826 | it means that this chunk of code will either | |
827 | never be called or result in strong amplification | |
828 | of burstiness. Dangerous, silly, and, however, | |
829 | no another solution exists. | |
830 | */ | |
831 | if ((cl = cl->borrow) == NULL) { | |
832 | this_cl->qstats.overlimits++; | |
833 | this_cl->overlimit(this_cl); | |
834 | return NULL; | |
835 | } | |
836 | if (cl->level > q->toplevel) | |
837 | return NULL; | |
a084980d | 838 | } while (cl->undertime != PSCHED_PASTPERFECT && q->now < cl->undertime); |
1da177e4 LT |
839 | |
840 | cl->delayed = 0; | |
841 | return cl; | |
842 | } | |
843 | ||
844 | static __inline__ struct sk_buff * | |
845 | cbq_dequeue_prio(struct Qdisc *sch, int prio) | |
846 | { | |
847 | struct cbq_sched_data *q = qdisc_priv(sch); | |
848 | struct cbq_class *cl_tail, *cl_prev, *cl; | |
849 | struct sk_buff *skb; | |
850 | int deficit; | |
851 | ||
852 | cl_tail = cl_prev = q->active[prio]; | |
853 | cl = cl_prev->next_alive; | |
854 | ||
855 | do { | |
856 | deficit = 0; | |
857 | ||
858 | /* Start round */ | |
859 | do { | |
860 | struct cbq_class *borrow = cl; | |
861 | ||
862 | if (cl->q->q.qlen && | |
863 | (borrow = cbq_under_limit(cl)) == NULL) | |
864 | goto skip_class; | |
865 | ||
866 | if (cl->deficit <= 0) { | |
867 | /* Class exhausted its allotment per | |
868 | this round. Switch to the next one. | |
869 | */ | |
870 | deficit = 1; | |
871 | cl->deficit += cl->quantum; | |
872 | goto next_class; | |
873 | } | |
874 | ||
875 | skb = cl->q->dequeue(cl->q); | |
876 | ||
877 | /* Class did not give us any skb :-( | |
10297b99 | 878 | It could occur even if cl->q->q.qlen != 0 |
1da177e4 LT |
879 | f.e. if cl->q == "tbf" |
880 | */ | |
881 | if (skb == NULL) | |
882 | goto skip_class; | |
883 | ||
884 | cl->deficit -= skb->len; | |
885 | q->tx_class = cl; | |
886 | q->tx_borrowed = borrow; | |
887 | if (borrow != cl) { | |
888 | #ifndef CBQ_XSTATS_BORROWS_BYTES | |
889 | borrow->xstats.borrows++; | |
890 | cl->xstats.borrows++; | |
891 | #else | |
892 | borrow->xstats.borrows += skb->len; | |
893 | cl->xstats.borrows += skb->len; | |
894 | #endif | |
895 | } | |
896 | q->tx_len = skb->len; | |
897 | ||
898 | if (cl->deficit <= 0) { | |
899 | q->active[prio] = cl; | |
900 | cl = cl->next_alive; | |
901 | cl->deficit += cl->quantum; | |
902 | } | |
903 | return skb; | |
904 | ||
905 | skip_class: | |
906 | if (cl->q->q.qlen == 0 || prio != cl->cpriority) { | |
907 | /* Class is empty or penalized. | |
908 | Unlink it from active chain. | |
909 | */ | |
910 | cl_prev->next_alive = cl->next_alive; | |
911 | cl->next_alive = NULL; | |
912 | ||
913 | /* Did cl_tail point to it? */ | |
914 | if (cl == cl_tail) { | |
915 | /* Repair it! */ | |
916 | cl_tail = cl_prev; | |
917 | ||
918 | /* Was it the last class in this band? */ | |
919 | if (cl == cl_tail) { | |
920 | /* Kill the band! */ | |
921 | q->active[prio] = NULL; | |
922 | q->activemask &= ~(1<<prio); | |
923 | if (cl->q->q.qlen) | |
924 | cbq_activate_class(cl); | |
925 | return NULL; | |
926 | } | |
927 | ||
928 | q->active[prio] = cl_tail; | |
929 | } | |
930 | if (cl->q->q.qlen) | |
931 | cbq_activate_class(cl); | |
932 | ||
933 | cl = cl_prev; | |
934 | } | |
935 | ||
936 | next_class: | |
937 | cl_prev = cl; | |
938 | cl = cl->next_alive; | |
939 | } while (cl_prev != cl_tail); | |
940 | } while (deficit); | |
941 | ||
942 | q->active[prio] = cl_prev; | |
943 | ||
944 | return NULL; | |
945 | } | |
946 | ||
947 | static __inline__ struct sk_buff * | |
948 | cbq_dequeue_1(struct Qdisc *sch) | |
949 | { | |
950 | struct cbq_sched_data *q = qdisc_priv(sch); | |
951 | struct sk_buff *skb; | |
952 | unsigned activemask; | |
953 | ||
954 | activemask = q->activemask&0xFF; | |
955 | while (activemask) { | |
956 | int prio = ffz(~activemask); | |
957 | activemask &= ~(1<<prio); | |
958 | skb = cbq_dequeue_prio(sch, prio); | |
959 | if (skb) | |
960 | return skb; | |
961 | } | |
962 | return NULL; | |
963 | } | |
964 | ||
965 | static struct sk_buff * | |
966 | cbq_dequeue(struct Qdisc *sch) | |
967 | { | |
968 | struct sk_buff *skb; | |
969 | struct cbq_sched_data *q = qdisc_priv(sch); | |
970 | psched_time_t now; | |
971 | psched_tdiff_t incr; | |
972 | ||
3bebcda2 | 973 | now = psched_get_time(); |
8edc0c31 | 974 | incr = now - q->now_rt; |
1da177e4 LT |
975 | |
976 | if (q->tx_class) { | |
977 | psched_tdiff_t incr2; | |
978 | /* Time integrator. We calculate EOS time | |
979 | by adding expected packet transmission time. | |
980 | If real time is greater, we warp artificial clock, | |
981 | so that: | |
982 | ||
983 | cbq_time = max(real_time, work); | |
984 | */ | |
985 | incr2 = L2T(&q->link, q->tx_len); | |
7c59e25f | 986 | q->now += incr2; |
1da177e4 LT |
987 | cbq_update(q); |
988 | if ((incr -= incr2) < 0) | |
989 | incr = 0; | |
990 | } | |
7c59e25f | 991 | q->now += incr; |
1da177e4 LT |
992 | q->now_rt = now; |
993 | ||
994 | for (;;) { | |
995 | q->wd_expires = 0; | |
996 | ||
997 | skb = cbq_dequeue_1(sch); | |
998 | if (skb) { | |
999 | sch->q.qlen--; | |
1000 | sch->flags &= ~TCQ_F_THROTTLED; | |
1001 | return skb; | |
1002 | } | |
1003 | ||
1004 | /* All the classes are overlimit. | |
1005 | ||
1006 | It is possible, if: | |
1007 | ||
1008 | 1. Scheduler is empty. | |
1009 | 2. Toplevel cutoff inhibited borrowing. | |
1010 | 3. Root class is overlimit. | |
1011 | ||
1012 | Reset 2d and 3d conditions and retry. | |
1013 | ||
1014 | Note, that NS and cbq-2.0 are buggy, peeking | |
1015 | an arbitrary class is appropriate for ancestor-only | |
1016 | sharing, but not for toplevel algorithm. | |
1017 | ||
1018 | Our version is better, but slower, because it requires | |
1019 | two passes, but it is unavoidable with top-level sharing. | |
1020 | */ | |
1021 | ||
1022 | if (q->toplevel == TC_CBQ_MAXLEVEL && | |
a084980d | 1023 | q->link.undertime == PSCHED_PASTPERFECT) |
1da177e4 LT |
1024 | break; |
1025 | ||
1026 | q->toplevel = TC_CBQ_MAXLEVEL; | |
a084980d | 1027 | q->link.undertime = PSCHED_PASTPERFECT; |
1da177e4 LT |
1028 | } |
1029 | ||
1030 | /* No packets in scheduler or nobody wants to give them to us :-( | |
1031 | Sigh... start watchdog timer in the last case. */ | |
1032 | ||
1033 | if (sch->q.qlen) { | |
1034 | sch->qstats.overlimits++; | |
88a99354 PM |
1035 | if (q->wd_expires) |
1036 | qdisc_watchdog_schedule(&q->watchdog, | |
bb239acf | 1037 | now + q->wd_expires); |
1da177e4 LT |
1038 | } |
1039 | return NULL; | |
1040 | } | |
1041 | ||
1042 | /* CBQ class maintanance routines */ | |
1043 | ||
1044 | static void cbq_adjust_levels(struct cbq_class *this) | |
1045 | { | |
1046 | if (this == NULL) | |
1047 | return; | |
1048 | ||
1049 | do { | |
1050 | int level = 0; | |
1051 | struct cbq_class *cl; | |
1052 | ||
1053 | if ((cl = this->children) != NULL) { | |
1054 | do { | |
1055 | if (cl->level > level) | |
1056 | level = cl->level; | |
1057 | } while ((cl = cl->sibling) != this->children); | |
1058 | } | |
1059 | this->level = level+1; | |
1060 | } while ((this = this->tparent) != NULL); | |
1061 | } | |
1062 | ||
1063 | static void cbq_normalize_quanta(struct cbq_sched_data *q, int prio) | |
1064 | { | |
1065 | struct cbq_class *cl; | |
d77fea2e PM |
1066 | struct hlist_node *n; |
1067 | unsigned int h; | |
1da177e4 LT |
1068 | |
1069 | if (q->quanta[prio] == 0) | |
1070 | return; | |
1071 | ||
d77fea2e PM |
1072 | for (h = 0; h < q->clhash.hashsize; h++) { |
1073 | hlist_for_each_entry(cl, n, &q->clhash.hash[h], common.hnode) { | |
1da177e4 LT |
1074 | /* BUGGGG... Beware! This expression suffer of |
1075 | arithmetic overflows! | |
1076 | */ | |
1077 | if (cl->priority == prio) { | |
1078 | cl->quantum = (cl->weight*cl->allot*q->nclasses[prio])/ | |
1079 | q->quanta[prio]; | |
1080 | } | |
5ce2d488 | 1081 | if (cl->quantum <= 0 || cl->quantum>32*qdisc_dev(cl->qdisc)->mtu) { |
d77fea2e | 1082 | printk(KERN_WARNING "CBQ: class %08x has bad quantum==%ld, repaired.\n", cl->common.classid, cl->quantum); |
5ce2d488 | 1083 | cl->quantum = qdisc_dev(cl->qdisc)->mtu/2 + 1; |
1da177e4 LT |
1084 | } |
1085 | } | |
1086 | } | |
1087 | } | |
1088 | ||
1089 | static void cbq_sync_defmap(struct cbq_class *cl) | |
1090 | { | |
1091 | struct cbq_sched_data *q = qdisc_priv(cl->qdisc); | |
1092 | struct cbq_class *split = cl->split; | |
1093 | unsigned h; | |
1094 | int i; | |
1095 | ||
1096 | if (split == NULL) | |
1097 | return; | |
1098 | ||
1099 | for (i=0; i<=TC_PRIO_MAX; i++) { | |
1100 | if (split->defaults[i] == cl && !(cl->defmap&(1<<i))) | |
1101 | split->defaults[i] = NULL; | |
1102 | } | |
1103 | ||
1104 | for (i=0; i<=TC_PRIO_MAX; i++) { | |
1105 | int level = split->level; | |
1106 | ||
1107 | if (split->defaults[i]) | |
1108 | continue; | |
1109 | ||
d77fea2e PM |
1110 | for (h = 0; h < q->clhash.hashsize; h++) { |
1111 | struct hlist_node *n; | |
1da177e4 LT |
1112 | struct cbq_class *c; |
1113 | ||
d77fea2e PM |
1114 | hlist_for_each_entry(c, n, &q->clhash.hash[h], |
1115 | common.hnode) { | |
1da177e4 LT |
1116 | if (c->split == split && c->level < level && |
1117 | c->defmap&(1<<i)) { | |
1118 | split->defaults[i] = c; | |
1119 | level = c->level; | |
1120 | } | |
1121 | } | |
1122 | } | |
1123 | } | |
1124 | } | |
1125 | ||
1126 | static void cbq_change_defmap(struct cbq_class *cl, u32 splitid, u32 def, u32 mask) | |
1127 | { | |
1128 | struct cbq_class *split = NULL; | |
1129 | ||
1130 | if (splitid == 0) { | |
1131 | if ((split = cl->split) == NULL) | |
1132 | return; | |
d77fea2e | 1133 | splitid = split->common.classid; |
1da177e4 LT |
1134 | } |
1135 | ||
d77fea2e | 1136 | if (split == NULL || split->common.classid != splitid) { |
1da177e4 | 1137 | for (split = cl->tparent; split; split = split->tparent) |
d77fea2e | 1138 | if (split->common.classid == splitid) |
1da177e4 LT |
1139 | break; |
1140 | } | |
1141 | ||
1142 | if (split == NULL) | |
1143 | return; | |
1144 | ||
1145 | if (cl->split != split) { | |
1146 | cl->defmap = 0; | |
1147 | cbq_sync_defmap(cl); | |
1148 | cl->split = split; | |
1149 | cl->defmap = def&mask; | |
1150 | } else | |
1151 | cl->defmap = (cl->defmap&~mask)|(def&mask); | |
1152 | ||
1153 | cbq_sync_defmap(cl); | |
1154 | } | |
1155 | ||
1156 | static void cbq_unlink_class(struct cbq_class *this) | |
1157 | { | |
1158 | struct cbq_class *cl, **clp; | |
1159 | struct cbq_sched_data *q = qdisc_priv(this->qdisc); | |
1160 | ||
d77fea2e | 1161 | qdisc_class_hash_remove(&q->clhash, &this->common); |
1da177e4 LT |
1162 | |
1163 | if (this->tparent) { | |
1164 | clp=&this->sibling; | |
1165 | cl = *clp; | |
1166 | do { | |
1167 | if (cl == this) { | |
1168 | *clp = cl->sibling; | |
1169 | break; | |
1170 | } | |
1171 | clp = &cl->sibling; | |
1172 | } while ((cl = *clp) != this->sibling); | |
1173 | ||
1174 | if (this->tparent->children == this) { | |
1175 | this->tparent->children = this->sibling; | |
1176 | if (this->sibling == this) | |
1177 | this->tparent->children = NULL; | |
1178 | } | |
1179 | } else { | |
1180 | BUG_TRAP(this->sibling == this); | |
1181 | } | |
1182 | } | |
1183 | ||
1184 | static void cbq_link_class(struct cbq_class *this) | |
1185 | { | |
1186 | struct cbq_sched_data *q = qdisc_priv(this->qdisc); | |
1da177e4 LT |
1187 | struct cbq_class *parent = this->tparent; |
1188 | ||
1189 | this->sibling = this; | |
d77fea2e | 1190 | qdisc_class_hash_insert(&q->clhash, &this->common); |
1da177e4 LT |
1191 | |
1192 | if (parent == NULL) | |
1193 | return; | |
1194 | ||
1195 | if (parent->children == NULL) { | |
1196 | parent->children = this; | |
1197 | } else { | |
1198 | this->sibling = parent->children->sibling; | |
1199 | parent->children->sibling = this; | |
1200 | } | |
1201 | } | |
1202 | ||
1203 | static unsigned int cbq_drop(struct Qdisc* sch) | |
1204 | { | |
1205 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1206 | struct cbq_class *cl, *cl_head; | |
1207 | int prio; | |
1208 | unsigned int len; | |
1209 | ||
1210 | for (prio = TC_CBQ_MAXPRIO; prio >= 0; prio--) { | |
1211 | if ((cl_head = q->active[prio]) == NULL) | |
1212 | continue; | |
1213 | ||
1214 | cl = cl_head; | |
1215 | do { | |
1216 | if (cl->q->ops->drop && (len = cl->q->ops->drop(cl->q))) { | |
1217 | sch->q.qlen--; | |
a37ef2e3 JP |
1218 | if (!cl->q->q.qlen) |
1219 | cbq_deactivate_class(cl); | |
1da177e4 LT |
1220 | return len; |
1221 | } | |
1222 | } while ((cl = cl->next_alive) != cl_head); | |
1223 | } | |
1224 | return 0; | |
1225 | } | |
1226 | ||
1227 | static void | |
1228 | cbq_reset(struct Qdisc* sch) | |
1229 | { | |
1230 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1231 | struct cbq_class *cl; | |
d77fea2e | 1232 | struct hlist_node *n; |
1da177e4 LT |
1233 | int prio; |
1234 | unsigned h; | |
1235 | ||
1236 | q->activemask = 0; | |
1237 | q->pmask = 0; | |
1238 | q->tx_class = NULL; | |
1239 | q->tx_borrowed = NULL; | |
88a99354 | 1240 | qdisc_watchdog_cancel(&q->watchdog); |
1a13cb63 | 1241 | hrtimer_cancel(&q->delay_timer); |
1da177e4 | 1242 | q->toplevel = TC_CBQ_MAXLEVEL; |
3bebcda2 | 1243 | q->now = psched_get_time(); |
1da177e4 LT |
1244 | q->now_rt = q->now; |
1245 | ||
1246 | for (prio = 0; prio <= TC_CBQ_MAXPRIO; prio++) | |
1247 | q->active[prio] = NULL; | |
1248 | ||
d77fea2e PM |
1249 | for (h = 0; h < q->clhash.hashsize; h++) { |
1250 | hlist_for_each_entry(cl, n, &q->clhash.hash[h], common.hnode) { | |
1da177e4 LT |
1251 | qdisc_reset(cl->q); |
1252 | ||
1253 | cl->next_alive = NULL; | |
a084980d | 1254 | cl->undertime = PSCHED_PASTPERFECT; |
1da177e4 LT |
1255 | cl->avgidle = cl->maxidle; |
1256 | cl->deficit = cl->quantum; | |
1257 | cl->cpriority = cl->priority; | |
1258 | } | |
1259 | } | |
1260 | sch->q.qlen = 0; | |
1261 | } | |
1262 | ||
1263 | ||
1264 | static int cbq_set_lss(struct cbq_class *cl, struct tc_cbq_lssopt *lss) | |
1265 | { | |
1266 | if (lss->change&TCF_CBQ_LSS_FLAGS) { | |
1267 | cl->share = (lss->flags&TCF_CBQ_LSS_ISOLATED) ? NULL : cl->tparent; | |
1268 | cl->borrow = (lss->flags&TCF_CBQ_LSS_BOUNDED) ? NULL : cl->tparent; | |
1269 | } | |
1270 | if (lss->change&TCF_CBQ_LSS_EWMA) | |
1271 | cl->ewma_log = lss->ewma_log; | |
1272 | if (lss->change&TCF_CBQ_LSS_AVPKT) | |
1273 | cl->avpkt = lss->avpkt; | |
1274 | if (lss->change&TCF_CBQ_LSS_MINIDLE) | |
1275 | cl->minidle = -(long)lss->minidle; | |
1276 | if (lss->change&TCF_CBQ_LSS_MAXIDLE) { | |
1277 | cl->maxidle = lss->maxidle; | |
1278 | cl->avgidle = lss->maxidle; | |
1279 | } | |
1280 | if (lss->change&TCF_CBQ_LSS_OFFTIME) | |
1281 | cl->offtime = lss->offtime; | |
1282 | return 0; | |
1283 | } | |
1284 | ||
1285 | static void cbq_rmprio(struct cbq_sched_data *q, struct cbq_class *cl) | |
1286 | { | |
1287 | q->nclasses[cl->priority]--; | |
1288 | q->quanta[cl->priority] -= cl->weight; | |
1289 | cbq_normalize_quanta(q, cl->priority); | |
1290 | } | |
1291 | ||
1292 | static void cbq_addprio(struct cbq_sched_data *q, struct cbq_class *cl) | |
1293 | { | |
1294 | q->nclasses[cl->priority]++; | |
1295 | q->quanta[cl->priority] += cl->weight; | |
1296 | cbq_normalize_quanta(q, cl->priority); | |
1297 | } | |
1298 | ||
1299 | static int cbq_set_wrr(struct cbq_class *cl, struct tc_cbq_wrropt *wrr) | |
1300 | { | |
1301 | struct cbq_sched_data *q = qdisc_priv(cl->qdisc); | |
1302 | ||
1303 | if (wrr->allot) | |
1304 | cl->allot = wrr->allot; | |
1305 | if (wrr->weight) | |
1306 | cl->weight = wrr->weight; | |
1307 | if (wrr->priority) { | |
1308 | cl->priority = wrr->priority-1; | |
1309 | cl->cpriority = cl->priority; | |
1310 | if (cl->priority >= cl->priority2) | |
1311 | cl->priority2 = TC_CBQ_MAXPRIO-1; | |
1312 | } | |
1313 | ||
1314 | cbq_addprio(q, cl); | |
1315 | return 0; | |
1316 | } | |
1317 | ||
1318 | static int cbq_set_overlimit(struct cbq_class *cl, struct tc_cbq_ovl *ovl) | |
1319 | { | |
1320 | switch (ovl->strategy) { | |
1321 | case TC_CBQ_OVL_CLASSIC: | |
1322 | cl->overlimit = cbq_ovl_classic; | |
1323 | break; | |
1324 | case TC_CBQ_OVL_DELAY: | |
1325 | cl->overlimit = cbq_ovl_delay; | |
1326 | break; | |
1327 | case TC_CBQ_OVL_LOWPRIO: | |
1328 | if (ovl->priority2-1 >= TC_CBQ_MAXPRIO || | |
1329 | ovl->priority2-1 <= cl->priority) | |
1330 | return -EINVAL; | |
1331 | cl->priority2 = ovl->priority2-1; | |
1332 | cl->overlimit = cbq_ovl_lowprio; | |
1333 | break; | |
1334 | case TC_CBQ_OVL_DROP: | |
1335 | cl->overlimit = cbq_ovl_drop; | |
1336 | break; | |
1337 | case TC_CBQ_OVL_RCLASSIC: | |
1338 | cl->overlimit = cbq_ovl_rclassic; | |
1339 | break; | |
1340 | default: | |
1341 | return -EINVAL; | |
1342 | } | |
1a13cb63 | 1343 | cl->penalty = ovl->penalty; |
1da177e4 LT |
1344 | return 0; |
1345 | } | |
1346 | ||
c3bc7cff | 1347 | #ifdef CONFIG_NET_CLS_ACT |
1da177e4 LT |
1348 | static int cbq_set_police(struct cbq_class *cl, struct tc_cbq_police *p) |
1349 | { | |
1350 | cl->police = p->police; | |
1351 | ||
1352 | if (cl->q->handle) { | |
1353 | if (p->police == TC_POLICE_RECLASSIFY) | |
1354 | cl->q->reshape_fail = cbq_reshape_fail; | |
1355 | else | |
1356 | cl->q->reshape_fail = NULL; | |
1357 | } | |
1358 | return 0; | |
1359 | } | |
1360 | #endif | |
1361 | ||
1362 | static int cbq_set_fopt(struct cbq_class *cl, struct tc_cbq_fopt *fopt) | |
1363 | { | |
1364 | cbq_change_defmap(cl, fopt->split, fopt->defmap, fopt->defchange); | |
1365 | return 0; | |
1366 | } | |
1367 | ||
27a3421e PM |
1368 | static const struct nla_policy cbq_policy[TCA_CBQ_MAX + 1] = { |
1369 | [TCA_CBQ_LSSOPT] = { .len = sizeof(struct tc_cbq_lssopt) }, | |
1370 | [TCA_CBQ_WRROPT] = { .len = sizeof(struct tc_cbq_wrropt) }, | |
1371 | [TCA_CBQ_FOPT] = { .len = sizeof(struct tc_cbq_fopt) }, | |
1372 | [TCA_CBQ_OVL_STRATEGY] = { .len = sizeof(struct tc_cbq_ovl) }, | |
1373 | [TCA_CBQ_RATE] = { .len = sizeof(struct tc_ratespec) }, | |
1374 | [TCA_CBQ_RTAB] = { .type = NLA_BINARY, .len = TC_RTAB_SIZE }, | |
1375 | [TCA_CBQ_POLICE] = { .len = sizeof(struct tc_cbq_police) }, | |
1376 | }; | |
1377 | ||
1e90474c | 1378 | static int cbq_init(struct Qdisc *sch, struct nlattr *opt) |
1da177e4 LT |
1379 | { |
1380 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1e90474c | 1381 | struct nlattr *tb[TCA_CBQ_MAX + 1]; |
1da177e4 | 1382 | struct tc_ratespec *r; |
cee63723 PM |
1383 | int err; |
1384 | ||
27a3421e | 1385 | err = nla_parse_nested(tb, TCA_CBQ_MAX, opt, cbq_policy); |
cee63723 PM |
1386 | if (err < 0) |
1387 | return err; | |
1da177e4 | 1388 | |
27a3421e | 1389 | if (tb[TCA_CBQ_RTAB] == NULL || tb[TCA_CBQ_RATE] == NULL) |
1da177e4 LT |
1390 | return -EINVAL; |
1391 | ||
1e90474c | 1392 | r = nla_data(tb[TCA_CBQ_RATE]); |
1da177e4 | 1393 | |
1e90474c | 1394 | if ((q->link.R_tab = qdisc_get_rtab(r, tb[TCA_CBQ_RTAB])) == NULL) |
1da177e4 LT |
1395 | return -EINVAL; |
1396 | ||
d77fea2e PM |
1397 | err = qdisc_class_hash_init(&q->clhash); |
1398 | if (err < 0) | |
1399 | goto put_rtab; | |
1400 | ||
1da177e4 LT |
1401 | q->link.refcnt = 1; |
1402 | q->link.sibling = &q->link; | |
d77fea2e | 1403 | q->link.common.classid = sch->handle; |
1da177e4 | 1404 | q->link.qdisc = sch; |
5ce2d488 | 1405 | if (!(q->link.q = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue, |
bb949fbd | 1406 | &pfifo_qdisc_ops, |
9f9afec4 | 1407 | sch->handle))) |
1da177e4 LT |
1408 | q->link.q = &noop_qdisc; |
1409 | ||
1410 | q->link.priority = TC_CBQ_MAXPRIO-1; | |
1411 | q->link.priority2 = TC_CBQ_MAXPRIO-1; | |
1412 | q->link.cpriority = TC_CBQ_MAXPRIO-1; | |
1413 | q->link.ovl_strategy = TC_CBQ_OVL_CLASSIC; | |
1414 | q->link.overlimit = cbq_ovl_classic; | |
5ce2d488 | 1415 | q->link.allot = psched_mtu(qdisc_dev(sch)); |
1da177e4 LT |
1416 | q->link.quantum = q->link.allot; |
1417 | q->link.weight = q->link.R_tab->rate.rate; | |
1418 | ||
1419 | q->link.ewma_log = TC_CBQ_DEF_EWMA; | |
1420 | q->link.avpkt = q->link.allot/2; | |
1421 | q->link.minidle = -0x7FFFFFFF; | |
1da177e4 | 1422 | |
88a99354 | 1423 | qdisc_watchdog_init(&q->watchdog, sch); |
1a13cb63 | 1424 | hrtimer_init(&q->delay_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); |
1da177e4 LT |
1425 | q->delay_timer.function = cbq_undelay; |
1426 | q->toplevel = TC_CBQ_MAXLEVEL; | |
3bebcda2 | 1427 | q->now = psched_get_time(); |
1da177e4 LT |
1428 | q->now_rt = q->now; |
1429 | ||
1430 | cbq_link_class(&q->link); | |
1431 | ||
1e90474c PM |
1432 | if (tb[TCA_CBQ_LSSOPT]) |
1433 | cbq_set_lss(&q->link, nla_data(tb[TCA_CBQ_LSSOPT])); | |
1da177e4 LT |
1434 | |
1435 | cbq_addprio(q, &q->link); | |
1436 | return 0; | |
d77fea2e PM |
1437 | |
1438 | put_rtab: | |
1439 | qdisc_put_rtab(q->link.R_tab); | |
1440 | return err; | |
1da177e4 LT |
1441 | } |
1442 | ||
1443 | static __inline__ int cbq_dump_rate(struct sk_buff *skb, struct cbq_class *cl) | |
1444 | { | |
27a884dc | 1445 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 | 1446 | |
1e90474c | 1447 | NLA_PUT(skb, TCA_CBQ_RATE, sizeof(cl->R_tab->rate), &cl->R_tab->rate); |
1da177e4 LT |
1448 | return skb->len; |
1449 | ||
1e90474c | 1450 | nla_put_failure: |
dc5fc579 | 1451 | nlmsg_trim(skb, b); |
1da177e4 LT |
1452 | return -1; |
1453 | } | |
1454 | ||
1455 | static __inline__ int cbq_dump_lss(struct sk_buff *skb, struct cbq_class *cl) | |
1456 | { | |
27a884dc | 1457 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
1458 | struct tc_cbq_lssopt opt; |
1459 | ||
1460 | opt.flags = 0; | |
1461 | if (cl->borrow == NULL) | |
1462 | opt.flags |= TCF_CBQ_LSS_BOUNDED; | |
1463 | if (cl->share == NULL) | |
1464 | opt.flags |= TCF_CBQ_LSS_ISOLATED; | |
1465 | opt.ewma_log = cl->ewma_log; | |
1466 | opt.level = cl->level; | |
1467 | opt.avpkt = cl->avpkt; | |
1468 | opt.maxidle = cl->maxidle; | |
1469 | opt.minidle = (u32)(-cl->minidle); | |
1470 | opt.offtime = cl->offtime; | |
1471 | opt.change = ~0; | |
1e90474c | 1472 | NLA_PUT(skb, TCA_CBQ_LSSOPT, sizeof(opt), &opt); |
1da177e4 LT |
1473 | return skb->len; |
1474 | ||
1e90474c | 1475 | nla_put_failure: |
dc5fc579 | 1476 | nlmsg_trim(skb, b); |
1da177e4 LT |
1477 | return -1; |
1478 | } | |
1479 | ||
1480 | static __inline__ int cbq_dump_wrr(struct sk_buff *skb, struct cbq_class *cl) | |
1481 | { | |
27a884dc | 1482 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
1483 | struct tc_cbq_wrropt opt; |
1484 | ||
1485 | opt.flags = 0; | |
1486 | opt.allot = cl->allot; | |
1487 | opt.priority = cl->priority+1; | |
1488 | opt.cpriority = cl->cpriority+1; | |
1489 | opt.weight = cl->weight; | |
1e90474c | 1490 | NLA_PUT(skb, TCA_CBQ_WRROPT, sizeof(opt), &opt); |
1da177e4 LT |
1491 | return skb->len; |
1492 | ||
1e90474c | 1493 | nla_put_failure: |
dc5fc579 | 1494 | nlmsg_trim(skb, b); |
1da177e4 LT |
1495 | return -1; |
1496 | } | |
1497 | ||
1498 | static __inline__ int cbq_dump_ovl(struct sk_buff *skb, struct cbq_class *cl) | |
1499 | { | |
27a884dc | 1500 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
1501 | struct tc_cbq_ovl opt; |
1502 | ||
1503 | opt.strategy = cl->ovl_strategy; | |
1504 | opt.priority2 = cl->priority2+1; | |
8a47077a | 1505 | opt.pad = 0; |
1a13cb63 | 1506 | opt.penalty = cl->penalty; |
1e90474c | 1507 | NLA_PUT(skb, TCA_CBQ_OVL_STRATEGY, sizeof(opt), &opt); |
1da177e4 LT |
1508 | return skb->len; |
1509 | ||
1e90474c | 1510 | nla_put_failure: |
dc5fc579 | 1511 | nlmsg_trim(skb, b); |
1da177e4 LT |
1512 | return -1; |
1513 | } | |
1514 | ||
1515 | static __inline__ int cbq_dump_fopt(struct sk_buff *skb, struct cbq_class *cl) | |
1516 | { | |
27a884dc | 1517 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
1518 | struct tc_cbq_fopt opt; |
1519 | ||
1520 | if (cl->split || cl->defmap) { | |
d77fea2e | 1521 | opt.split = cl->split ? cl->split->common.classid : 0; |
1da177e4 LT |
1522 | opt.defmap = cl->defmap; |
1523 | opt.defchange = ~0; | |
1e90474c | 1524 | NLA_PUT(skb, TCA_CBQ_FOPT, sizeof(opt), &opt); |
1da177e4 LT |
1525 | } |
1526 | return skb->len; | |
1527 | ||
1e90474c | 1528 | nla_put_failure: |
dc5fc579 | 1529 | nlmsg_trim(skb, b); |
1da177e4 LT |
1530 | return -1; |
1531 | } | |
1532 | ||
c3bc7cff | 1533 | #ifdef CONFIG_NET_CLS_ACT |
1da177e4 LT |
1534 | static __inline__ int cbq_dump_police(struct sk_buff *skb, struct cbq_class *cl) |
1535 | { | |
27a884dc | 1536 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
1537 | struct tc_cbq_police opt; |
1538 | ||
1539 | if (cl->police) { | |
1540 | opt.police = cl->police; | |
9ef1d4c7 PM |
1541 | opt.__res1 = 0; |
1542 | opt.__res2 = 0; | |
1e90474c | 1543 | NLA_PUT(skb, TCA_CBQ_POLICE, sizeof(opt), &opt); |
1da177e4 LT |
1544 | } |
1545 | return skb->len; | |
1546 | ||
1e90474c | 1547 | nla_put_failure: |
dc5fc579 | 1548 | nlmsg_trim(skb, b); |
1da177e4 LT |
1549 | return -1; |
1550 | } | |
1551 | #endif | |
1552 | ||
1553 | static int cbq_dump_attr(struct sk_buff *skb, struct cbq_class *cl) | |
1554 | { | |
1555 | if (cbq_dump_lss(skb, cl) < 0 || | |
1556 | cbq_dump_rate(skb, cl) < 0 || | |
1557 | cbq_dump_wrr(skb, cl) < 0 || | |
1558 | cbq_dump_ovl(skb, cl) < 0 || | |
c3bc7cff | 1559 | #ifdef CONFIG_NET_CLS_ACT |
1da177e4 LT |
1560 | cbq_dump_police(skb, cl) < 0 || |
1561 | #endif | |
1562 | cbq_dump_fopt(skb, cl) < 0) | |
1563 | return -1; | |
1564 | return 0; | |
1565 | } | |
1566 | ||
1567 | static int cbq_dump(struct Qdisc *sch, struct sk_buff *skb) | |
1568 | { | |
1569 | struct cbq_sched_data *q = qdisc_priv(sch); | |
4b3550ef | 1570 | struct nlattr *nest; |
1da177e4 | 1571 | |
4b3550ef PM |
1572 | nest = nla_nest_start(skb, TCA_OPTIONS); |
1573 | if (nest == NULL) | |
1574 | goto nla_put_failure; | |
1da177e4 | 1575 | if (cbq_dump_attr(skb, &q->link) < 0) |
1e90474c | 1576 | goto nla_put_failure; |
4b3550ef | 1577 | nla_nest_end(skb, nest); |
1da177e4 LT |
1578 | return skb->len; |
1579 | ||
1e90474c | 1580 | nla_put_failure: |
4b3550ef | 1581 | nla_nest_cancel(skb, nest); |
1da177e4 LT |
1582 | return -1; |
1583 | } | |
1584 | ||
1585 | static int | |
1586 | cbq_dump_stats(struct Qdisc *sch, struct gnet_dump *d) | |
1587 | { | |
1588 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1589 | ||
1590 | q->link.xstats.avgidle = q->link.avgidle; | |
1591 | return gnet_stats_copy_app(d, &q->link.xstats, sizeof(q->link.xstats)); | |
1592 | } | |
1593 | ||
1594 | static int | |
1595 | cbq_dump_class(struct Qdisc *sch, unsigned long arg, | |
1596 | struct sk_buff *skb, struct tcmsg *tcm) | |
1597 | { | |
1598 | struct cbq_class *cl = (struct cbq_class*)arg; | |
4b3550ef | 1599 | struct nlattr *nest; |
1da177e4 LT |
1600 | |
1601 | if (cl->tparent) | |
d77fea2e | 1602 | tcm->tcm_parent = cl->tparent->common.classid; |
1da177e4 LT |
1603 | else |
1604 | tcm->tcm_parent = TC_H_ROOT; | |
d77fea2e | 1605 | tcm->tcm_handle = cl->common.classid; |
1da177e4 LT |
1606 | tcm->tcm_info = cl->q->handle; |
1607 | ||
4b3550ef PM |
1608 | nest = nla_nest_start(skb, TCA_OPTIONS); |
1609 | if (nest == NULL) | |
1610 | goto nla_put_failure; | |
1da177e4 | 1611 | if (cbq_dump_attr(skb, cl) < 0) |
1e90474c | 1612 | goto nla_put_failure; |
4b3550ef | 1613 | nla_nest_end(skb, nest); |
1da177e4 LT |
1614 | return skb->len; |
1615 | ||
1e90474c | 1616 | nla_put_failure: |
4b3550ef | 1617 | nla_nest_cancel(skb, nest); |
1da177e4 LT |
1618 | return -1; |
1619 | } | |
1620 | ||
1621 | static int | |
1622 | cbq_dump_class_stats(struct Qdisc *sch, unsigned long arg, | |
1623 | struct gnet_dump *d) | |
1624 | { | |
1625 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1626 | struct cbq_class *cl = (struct cbq_class*)arg; | |
1627 | ||
1628 | cl->qstats.qlen = cl->q->q.qlen; | |
1629 | cl->xstats.avgidle = cl->avgidle; | |
1630 | cl->xstats.undertime = 0; | |
1631 | ||
a084980d | 1632 | if (cl->undertime != PSCHED_PASTPERFECT) |
8edc0c31 | 1633 | cl->xstats.undertime = cl->undertime - q->now; |
1da177e4 LT |
1634 | |
1635 | if (gnet_stats_copy_basic(d, &cl->bstats) < 0 || | |
1da177e4 | 1636 | gnet_stats_copy_rate_est(d, &cl->rate_est) < 0 || |
1da177e4 LT |
1637 | gnet_stats_copy_queue(d, &cl->qstats) < 0) |
1638 | return -1; | |
1639 | ||
1640 | return gnet_stats_copy_app(d, &cl->xstats, sizeof(cl->xstats)); | |
1641 | } | |
1642 | ||
1643 | static int cbq_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new, | |
1644 | struct Qdisc **old) | |
1645 | { | |
1646 | struct cbq_class *cl = (struct cbq_class*)arg; | |
1647 | ||
1648 | if (cl) { | |
1649 | if (new == NULL) { | |
5ce2d488 | 1650 | new = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue, |
bb949fbd | 1651 | &pfifo_qdisc_ops, |
d77fea2e PM |
1652 | cl->common.classid); |
1653 | if (new == NULL) | |
1da177e4 LT |
1654 | return -ENOBUFS; |
1655 | } else { | |
c3bc7cff | 1656 | #ifdef CONFIG_NET_CLS_ACT |
1da177e4 LT |
1657 | if (cl->police == TC_POLICE_RECLASSIFY) |
1658 | new->reshape_fail = cbq_reshape_fail; | |
1659 | #endif | |
1660 | } | |
1661 | sch_tree_lock(sch); | |
a37ef2e3 | 1662 | *old = xchg(&cl->q, new); |
5e50da01 | 1663 | qdisc_tree_decrease_qlen(*old, (*old)->q.qlen); |
1da177e4 LT |
1664 | qdisc_reset(*old); |
1665 | sch_tree_unlock(sch); | |
1666 | ||
1667 | return 0; | |
1668 | } | |
1669 | return -ENOENT; | |
1670 | } | |
1671 | ||
1672 | static struct Qdisc * | |
1673 | cbq_leaf(struct Qdisc *sch, unsigned long arg) | |
1674 | { | |
1675 | struct cbq_class *cl = (struct cbq_class*)arg; | |
1676 | ||
1677 | return cl ? cl->q : NULL; | |
1678 | } | |
1679 | ||
a37ef2e3 JP |
1680 | static void cbq_qlen_notify(struct Qdisc *sch, unsigned long arg) |
1681 | { | |
1682 | struct cbq_class *cl = (struct cbq_class *)arg; | |
1683 | ||
1684 | if (cl->q->q.qlen == 0) | |
1685 | cbq_deactivate_class(cl); | |
1686 | } | |
1687 | ||
1da177e4 LT |
1688 | static unsigned long cbq_get(struct Qdisc *sch, u32 classid) |
1689 | { | |
1690 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1691 | struct cbq_class *cl = cbq_class_lookup(q, classid); | |
1692 | ||
1693 | if (cl) { | |
1694 | cl->refcnt++; | |
1695 | return (unsigned long)cl; | |
1696 | } | |
1697 | return 0; | |
1698 | } | |
1699 | ||
1da177e4 LT |
1700 | static void cbq_destroy_class(struct Qdisc *sch, struct cbq_class *cl) |
1701 | { | |
1702 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1703 | ||
1704 | BUG_TRAP(!cl->filters); | |
1705 | ||
ff31ab56 | 1706 | tcf_destroy_chain(&cl->filter_list); |
1da177e4 LT |
1707 | qdisc_destroy(cl->q); |
1708 | qdisc_put_rtab(cl->R_tab); | |
1da177e4 | 1709 | gen_kill_estimator(&cl->bstats, &cl->rate_est); |
1da177e4 LT |
1710 | if (cl != &q->link) |
1711 | kfree(cl); | |
1712 | } | |
1713 | ||
1714 | static void | |
1715 | cbq_destroy(struct Qdisc* sch) | |
1716 | { | |
1717 | struct cbq_sched_data *q = qdisc_priv(sch); | |
d77fea2e | 1718 | struct hlist_node *n, *next; |
1da177e4 LT |
1719 | struct cbq_class *cl; |
1720 | unsigned h; | |
1721 | ||
c3bc7cff | 1722 | #ifdef CONFIG_NET_CLS_ACT |
1da177e4 LT |
1723 | q->rx_class = NULL; |
1724 | #endif | |
1725 | /* | |
1726 | * Filters must be destroyed first because we don't destroy the | |
1727 | * classes from root to leafs which means that filters can still | |
1728 | * be bound to classes which have been destroyed already. --TGR '04 | |
1729 | */ | |
d77fea2e PM |
1730 | for (h = 0; h < q->clhash.hashsize; h++) { |
1731 | hlist_for_each_entry(cl, n, &q->clhash.hash[h], common.hnode) | |
ff31ab56 | 1732 | tcf_destroy_chain(&cl->filter_list); |
b00b4bf9 | 1733 | } |
d77fea2e PM |
1734 | for (h = 0; h < q->clhash.hashsize; h++) { |
1735 | hlist_for_each_entry_safe(cl, n, next, &q->clhash.hash[h], | |
1736 | common.hnode) | |
1da177e4 | 1737 | cbq_destroy_class(sch, cl); |
1da177e4 | 1738 | } |
d77fea2e | 1739 | qdisc_class_hash_destroy(&q->clhash); |
1da177e4 LT |
1740 | } |
1741 | ||
1742 | static void cbq_put(struct Qdisc *sch, unsigned long arg) | |
1743 | { | |
1744 | struct cbq_class *cl = (struct cbq_class*)arg; | |
1745 | ||
1746 | if (--cl->refcnt == 0) { | |
c3bc7cff | 1747 | #ifdef CONFIG_NET_CLS_ACT |
7698b4fc | 1748 | spinlock_t *root_lock = qdisc_root_lock(sch); |
1da177e4 LT |
1749 | struct cbq_sched_data *q = qdisc_priv(sch); |
1750 | ||
7698b4fc | 1751 | spin_lock_bh(root_lock); |
1da177e4 LT |
1752 | if (q->rx_class == cl) |
1753 | q->rx_class = NULL; | |
7698b4fc | 1754 | spin_unlock_bh(root_lock); |
1da177e4 LT |
1755 | #endif |
1756 | ||
1757 | cbq_destroy_class(sch, cl); | |
1758 | } | |
1759 | } | |
1760 | ||
1761 | static int | |
1e90474c | 1762 | cbq_change_class(struct Qdisc *sch, u32 classid, u32 parentid, struct nlattr **tca, |
1da177e4 LT |
1763 | unsigned long *arg) |
1764 | { | |
1765 | int err; | |
1766 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1767 | struct cbq_class *cl = (struct cbq_class*)*arg; | |
1e90474c PM |
1768 | struct nlattr *opt = tca[TCA_OPTIONS]; |
1769 | struct nlattr *tb[TCA_CBQ_MAX + 1]; | |
1da177e4 LT |
1770 | struct cbq_class *parent; |
1771 | struct qdisc_rate_table *rtab = NULL; | |
1772 | ||
cee63723 | 1773 | if (opt == NULL) |
1da177e4 LT |
1774 | return -EINVAL; |
1775 | ||
27a3421e | 1776 | err = nla_parse_nested(tb, TCA_CBQ_MAX, opt, cbq_policy); |
cee63723 PM |
1777 | if (err < 0) |
1778 | return err; | |
1779 | ||
1da177e4 LT |
1780 | if (cl) { |
1781 | /* Check parent */ | |
1782 | if (parentid) { | |
d77fea2e PM |
1783 | if (cl->tparent && |
1784 | cl->tparent->common.classid != parentid) | |
1da177e4 LT |
1785 | return -EINVAL; |
1786 | if (!cl->tparent && parentid != TC_H_ROOT) | |
1787 | return -EINVAL; | |
1788 | } | |
1789 | ||
1e90474c PM |
1790 | if (tb[TCA_CBQ_RATE]) { |
1791 | rtab = qdisc_get_rtab(nla_data(tb[TCA_CBQ_RATE]), tb[TCA_CBQ_RTAB]); | |
1da177e4 LT |
1792 | if (rtab == NULL) |
1793 | return -EINVAL; | |
1794 | } | |
1795 | ||
1796 | /* Change class parameters */ | |
1797 | sch_tree_lock(sch); | |
1798 | ||
1799 | if (cl->next_alive != NULL) | |
1800 | cbq_deactivate_class(cl); | |
1801 | ||
1802 | if (rtab) { | |
1803 | rtab = xchg(&cl->R_tab, rtab); | |
1804 | qdisc_put_rtab(rtab); | |
1805 | } | |
1806 | ||
1e90474c PM |
1807 | if (tb[TCA_CBQ_LSSOPT]) |
1808 | cbq_set_lss(cl, nla_data(tb[TCA_CBQ_LSSOPT])); | |
1da177e4 | 1809 | |
1e90474c | 1810 | if (tb[TCA_CBQ_WRROPT]) { |
1da177e4 | 1811 | cbq_rmprio(q, cl); |
1e90474c | 1812 | cbq_set_wrr(cl, nla_data(tb[TCA_CBQ_WRROPT])); |
1da177e4 LT |
1813 | } |
1814 | ||
1e90474c PM |
1815 | if (tb[TCA_CBQ_OVL_STRATEGY]) |
1816 | cbq_set_overlimit(cl, nla_data(tb[TCA_CBQ_OVL_STRATEGY])); | |
1da177e4 | 1817 | |
c3bc7cff | 1818 | #ifdef CONFIG_NET_CLS_ACT |
1e90474c PM |
1819 | if (tb[TCA_CBQ_POLICE]) |
1820 | cbq_set_police(cl, nla_data(tb[TCA_CBQ_POLICE])); | |
1da177e4 LT |
1821 | #endif |
1822 | ||
1e90474c PM |
1823 | if (tb[TCA_CBQ_FOPT]) |
1824 | cbq_set_fopt(cl, nla_data(tb[TCA_CBQ_FOPT])); | |
1da177e4 LT |
1825 | |
1826 | if (cl->q->q.qlen) | |
1827 | cbq_activate_class(cl); | |
1828 | ||
1829 | sch_tree_unlock(sch); | |
1830 | ||
1e90474c | 1831 | if (tca[TCA_RATE]) |
1da177e4 | 1832 | gen_replace_estimator(&cl->bstats, &cl->rate_est, |
7698b4fc | 1833 | qdisc_root_lock(sch), |
1e90474c | 1834 | tca[TCA_RATE]); |
1da177e4 LT |
1835 | return 0; |
1836 | } | |
1837 | ||
1838 | if (parentid == TC_H_ROOT) | |
1839 | return -EINVAL; | |
1840 | ||
1e90474c PM |
1841 | if (tb[TCA_CBQ_WRROPT] == NULL || tb[TCA_CBQ_RATE] == NULL || |
1842 | tb[TCA_CBQ_LSSOPT] == NULL) | |
1da177e4 LT |
1843 | return -EINVAL; |
1844 | ||
1e90474c | 1845 | rtab = qdisc_get_rtab(nla_data(tb[TCA_CBQ_RATE]), tb[TCA_CBQ_RTAB]); |
1da177e4 LT |
1846 | if (rtab == NULL) |
1847 | return -EINVAL; | |
1848 | ||
1849 | if (classid) { | |
1850 | err = -EINVAL; | |
1851 | if (TC_H_MAJ(classid^sch->handle) || cbq_class_lookup(q, classid)) | |
1852 | goto failure; | |
1853 | } else { | |
1854 | int i; | |
1855 | classid = TC_H_MAKE(sch->handle,0x8000); | |
1856 | ||
1857 | for (i=0; i<0x8000; i++) { | |
1858 | if (++q->hgenerator >= 0x8000) | |
1859 | q->hgenerator = 1; | |
1860 | if (cbq_class_lookup(q, classid|q->hgenerator) == NULL) | |
1861 | break; | |
1862 | } | |
1863 | err = -ENOSR; | |
1864 | if (i >= 0x8000) | |
1865 | goto failure; | |
1866 | classid = classid|q->hgenerator; | |
1867 | } | |
1868 | ||
1869 | parent = &q->link; | |
1870 | if (parentid) { | |
1871 | parent = cbq_class_lookup(q, parentid); | |
1872 | err = -EINVAL; | |
1873 | if (parent == NULL) | |
1874 | goto failure; | |
1875 | } | |
1876 | ||
1877 | err = -ENOBUFS; | |
0da974f4 | 1878 | cl = kzalloc(sizeof(*cl), GFP_KERNEL); |
1da177e4 LT |
1879 | if (cl == NULL) |
1880 | goto failure; | |
1da177e4 LT |
1881 | cl->R_tab = rtab; |
1882 | rtab = NULL; | |
1883 | cl->refcnt = 1; | |
5ce2d488 | 1884 | if (!(cl->q = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue, |
bb949fbd | 1885 | &pfifo_qdisc_ops, classid))) |
1da177e4 | 1886 | cl->q = &noop_qdisc; |
d77fea2e | 1887 | cl->common.classid = classid; |
1da177e4 LT |
1888 | cl->tparent = parent; |
1889 | cl->qdisc = sch; | |
1890 | cl->allot = parent->allot; | |
1891 | cl->quantum = cl->allot; | |
1892 | cl->weight = cl->R_tab->rate.rate; | |
1da177e4 LT |
1893 | |
1894 | sch_tree_lock(sch); | |
1895 | cbq_link_class(cl); | |
1896 | cl->borrow = cl->tparent; | |
1897 | if (cl->tparent != &q->link) | |
1898 | cl->share = cl->tparent; | |
1899 | cbq_adjust_levels(parent); | |
1900 | cl->minidle = -0x7FFFFFFF; | |
1e90474c PM |
1901 | cbq_set_lss(cl, nla_data(tb[TCA_CBQ_LSSOPT])); |
1902 | cbq_set_wrr(cl, nla_data(tb[TCA_CBQ_WRROPT])); | |
1da177e4 LT |
1903 | if (cl->ewma_log==0) |
1904 | cl->ewma_log = q->link.ewma_log; | |
1905 | if (cl->maxidle==0) | |
1906 | cl->maxidle = q->link.maxidle; | |
1907 | if (cl->avpkt==0) | |
1908 | cl->avpkt = q->link.avpkt; | |
1909 | cl->overlimit = cbq_ovl_classic; | |
1e90474c PM |
1910 | if (tb[TCA_CBQ_OVL_STRATEGY]) |
1911 | cbq_set_overlimit(cl, nla_data(tb[TCA_CBQ_OVL_STRATEGY])); | |
c3bc7cff | 1912 | #ifdef CONFIG_NET_CLS_ACT |
1e90474c PM |
1913 | if (tb[TCA_CBQ_POLICE]) |
1914 | cbq_set_police(cl, nla_data(tb[TCA_CBQ_POLICE])); | |
1da177e4 | 1915 | #endif |
1e90474c PM |
1916 | if (tb[TCA_CBQ_FOPT]) |
1917 | cbq_set_fopt(cl, nla_data(tb[TCA_CBQ_FOPT])); | |
1da177e4 LT |
1918 | sch_tree_unlock(sch); |
1919 | ||
d77fea2e PM |
1920 | qdisc_class_hash_grow(sch, &q->clhash); |
1921 | ||
1e90474c | 1922 | if (tca[TCA_RATE]) |
1da177e4 | 1923 | gen_new_estimator(&cl->bstats, &cl->rate_est, |
7698b4fc | 1924 | qdisc_root_lock(sch), tca[TCA_RATE]); |
1da177e4 LT |
1925 | |
1926 | *arg = (unsigned long)cl; | |
1927 | return 0; | |
1928 | ||
1929 | failure: | |
1930 | qdisc_put_rtab(rtab); | |
1931 | return err; | |
1932 | } | |
1933 | ||
1934 | static int cbq_delete(struct Qdisc *sch, unsigned long arg) | |
1935 | { | |
1936 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1937 | struct cbq_class *cl = (struct cbq_class*)arg; | |
a37ef2e3 | 1938 | unsigned int qlen; |
1da177e4 LT |
1939 | |
1940 | if (cl->filters || cl->children || cl == &q->link) | |
1941 | return -EBUSY; | |
1942 | ||
1943 | sch_tree_lock(sch); | |
1944 | ||
a37ef2e3 JP |
1945 | qlen = cl->q->q.qlen; |
1946 | qdisc_reset(cl->q); | |
1947 | qdisc_tree_decrease_qlen(cl->q, qlen); | |
1948 | ||
1da177e4 LT |
1949 | if (cl->next_alive) |
1950 | cbq_deactivate_class(cl); | |
1951 | ||
1952 | if (q->tx_borrowed == cl) | |
1953 | q->tx_borrowed = q->tx_class; | |
1954 | if (q->tx_class == cl) { | |
1955 | q->tx_class = NULL; | |
1956 | q->tx_borrowed = NULL; | |
1957 | } | |
c3bc7cff | 1958 | #ifdef CONFIG_NET_CLS_ACT |
1da177e4 LT |
1959 | if (q->rx_class == cl) |
1960 | q->rx_class = NULL; | |
1961 | #endif | |
1962 | ||
1963 | cbq_unlink_class(cl); | |
1964 | cbq_adjust_levels(cl->tparent); | |
1965 | cl->defmap = 0; | |
1966 | cbq_sync_defmap(cl); | |
1967 | ||
1968 | cbq_rmprio(q, cl); | |
1969 | sch_tree_unlock(sch); | |
1970 | ||
1971 | if (--cl->refcnt == 0) | |
1972 | cbq_destroy_class(sch, cl); | |
1973 | ||
1974 | return 0; | |
1975 | } | |
1976 | ||
1977 | static struct tcf_proto **cbq_find_tcf(struct Qdisc *sch, unsigned long arg) | |
1978 | { | |
1979 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1980 | struct cbq_class *cl = (struct cbq_class *)arg; | |
1981 | ||
1982 | if (cl == NULL) | |
1983 | cl = &q->link; | |
1984 | ||
1985 | return &cl->filter_list; | |
1986 | } | |
1987 | ||
1988 | static unsigned long cbq_bind_filter(struct Qdisc *sch, unsigned long parent, | |
1989 | u32 classid) | |
1990 | { | |
1991 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1992 | struct cbq_class *p = (struct cbq_class*)parent; | |
1993 | struct cbq_class *cl = cbq_class_lookup(q, classid); | |
1994 | ||
1995 | if (cl) { | |
1996 | if (p && p->level <= cl->level) | |
1997 | return 0; | |
1998 | cl->filters++; | |
1999 | return (unsigned long)cl; | |
2000 | } | |
2001 | return 0; | |
2002 | } | |
2003 | ||
2004 | static void cbq_unbind_filter(struct Qdisc *sch, unsigned long arg) | |
2005 | { | |
2006 | struct cbq_class *cl = (struct cbq_class*)arg; | |
2007 | ||
2008 | cl->filters--; | |
2009 | } | |
2010 | ||
2011 | static void cbq_walk(struct Qdisc *sch, struct qdisc_walker *arg) | |
2012 | { | |
2013 | struct cbq_sched_data *q = qdisc_priv(sch); | |
d77fea2e PM |
2014 | struct cbq_class *cl; |
2015 | struct hlist_node *n; | |
1da177e4 LT |
2016 | unsigned h; |
2017 | ||
2018 | if (arg->stop) | |
2019 | return; | |
2020 | ||
d77fea2e PM |
2021 | for (h = 0; h < q->clhash.hashsize; h++) { |
2022 | hlist_for_each_entry(cl, n, &q->clhash.hash[h], common.hnode) { | |
1da177e4 LT |
2023 | if (arg->count < arg->skip) { |
2024 | arg->count++; | |
2025 | continue; | |
2026 | } | |
2027 | if (arg->fn(sch, (unsigned long)cl, arg) < 0) { | |
2028 | arg->stop = 1; | |
2029 | return; | |
2030 | } | |
2031 | arg->count++; | |
2032 | } | |
2033 | } | |
2034 | } | |
2035 | ||
20fea08b | 2036 | static const struct Qdisc_class_ops cbq_class_ops = { |
1da177e4 LT |
2037 | .graft = cbq_graft, |
2038 | .leaf = cbq_leaf, | |
a37ef2e3 | 2039 | .qlen_notify = cbq_qlen_notify, |
1da177e4 LT |
2040 | .get = cbq_get, |
2041 | .put = cbq_put, | |
2042 | .change = cbq_change_class, | |
2043 | .delete = cbq_delete, | |
2044 | .walk = cbq_walk, | |
2045 | .tcf_chain = cbq_find_tcf, | |
2046 | .bind_tcf = cbq_bind_filter, | |
2047 | .unbind_tcf = cbq_unbind_filter, | |
2048 | .dump = cbq_dump_class, | |
2049 | .dump_stats = cbq_dump_class_stats, | |
2050 | }; | |
2051 | ||
20fea08b | 2052 | static struct Qdisc_ops cbq_qdisc_ops __read_mostly = { |
1da177e4 LT |
2053 | .next = NULL, |
2054 | .cl_ops = &cbq_class_ops, | |
2055 | .id = "cbq", | |
2056 | .priv_size = sizeof(struct cbq_sched_data), | |
2057 | .enqueue = cbq_enqueue, | |
2058 | .dequeue = cbq_dequeue, | |
2059 | .requeue = cbq_requeue, | |
2060 | .drop = cbq_drop, | |
2061 | .init = cbq_init, | |
2062 | .reset = cbq_reset, | |
2063 | .destroy = cbq_destroy, | |
2064 | .change = NULL, | |
2065 | .dump = cbq_dump, | |
2066 | .dump_stats = cbq_dump_stats, | |
2067 | .owner = THIS_MODULE, | |
2068 | }; | |
2069 | ||
2070 | static int __init cbq_module_init(void) | |
2071 | { | |
2072 | return register_qdisc(&cbq_qdisc_ops); | |
2073 | } | |
10297b99 | 2074 | static void __exit cbq_module_exit(void) |
1da177e4 LT |
2075 | { |
2076 | unregister_qdisc(&cbq_qdisc_ops); | |
2077 | } | |
2078 | module_init(cbq_module_init) | |
2079 | module_exit(cbq_module_exit) | |
2080 | MODULE_LICENSE("GPL"); |