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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 | ||
13 | #include <linux/config.h> | |
14 | #include <linux/module.h> | |
15 | #include <asm/uaccess.h> | |
16 | #include <asm/system.h> | |
17 | #include <linux/bitops.h> | |
18 | #include <linux/types.h> | |
19 | #include <linux/kernel.h> | |
20 | #include <linux/sched.h> | |
21 | #include <linux/string.h> | |
22 | #include <linux/mm.h> | |
23 | #include <linux/socket.h> | |
24 | #include <linux/sockios.h> | |
25 | #include <linux/in.h> | |
26 | #include <linux/errno.h> | |
27 | #include <linux/interrupt.h> | |
28 | #include <linux/if_ether.h> | |
29 | #include <linux/inet.h> | |
30 | #include <linux/netdevice.h> | |
31 | #include <linux/etherdevice.h> | |
32 | #include <linux/notifier.h> | |
33 | #include <net/ip.h> | |
34 | #include <net/route.h> | |
35 | #include <linux/skbuff.h> | |
36 | #include <net/sock.h> | |
37 | #include <net/pkt_sched.h> | |
38 | ||
39 | ||
40 | /* Class-Based Queueing (CBQ) algorithm. | |
41 | ======================================= | |
42 | ||
43 | Sources: [1] Sally Floyd and Van Jacobson, "Link-sharing and Resource | |
44 | Management Models for Packet Networks", | |
45 | IEEE/ACM Transactions on Networking, Vol.3, No.4, 1995 | |
46 | ||
47 | [2] Sally Floyd, "Notes on CBQ and Guaranteed Service", 1995 | |
48 | ||
49 | [3] Sally Floyd, "Notes on Class-Based Queueing: Setting | |
50 | Parameters", 1996 | |
51 | ||
52 | [4] Sally Floyd and Michael Speer, "Experimental Results | |
53 | for Class-Based Queueing", 1998, not published. | |
54 | ||
55 | ----------------------------------------------------------------------- | |
56 | ||
57 | Algorithm skeleton was taken from NS simulator cbq.cc. | |
58 | If someone wants to check this code against the LBL version, | |
59 | he should take into account that ONLY the skeleton was borrowed, | |
60 | the implementation is different. Particularly: | |
61 | ||
62 | --- The WRR algorithm is different. Our version looks more | |
63 | reasonable (I hope) and works when quanta are allowed to be | |
64 | less than MTU, which is always the case when real time classes | |
65 | have small rates. Note, that the statement of [3] is | |
66 | incomplete, delay may actually be estimated even if class | |
67 | per-round allotment is less than MTU. Namely, if per-round | |
68 | allotment is W*r_i, and r_1+...+r_k = r < 1 | |
69 | ||
70 | delay_i <= ([MTU/(W*r_i)]*W*r + W*r + k*MTU)/B | |
71 | ||
72 | In the worst case we have IntServ estimate with D = W*r+k*MTU | |
73 | and C = MTU*r. The proof (if correct at all) is trivial. | |
74 | ||
75 | ||
76 | --- It seems that cbq-2.0 is not very accurate. At least, I cannot | |
77 | interpret some places, which look like wrong translations | |
78 | from NS. Anyone is advised to find these differences | |
79 | and explain to me, why I am wrong 8). | |
80 | ||
81 | --- Linux has no EOI event, so that we cannot estimate true class | |
82 | idle time. Workaround is to consider the next dequeue event | |
83 | as sign that previous packet is finished. This is wrong because of | |
84 | internal device queueing, but on a permanently loaded link it is true. | |
85 | Moreover, combined with clock integrator, this scheme looks | |
86 | very close to an ideal solution. */ | |
87 | ||
88 | struct cbq_sched_data; | |
89 | ||
90 | ||
91 | struct cbq_class | |
92 | { | |
93 | struct cbq_class *next; /* hash table link */ | |
94 | struct cbq_class *next_alive; /* next class with backlog in this priority band */ | |
95 | ||
96 | /* Parameters */ | |
97 | u32 classid; | |
98 | unsigned char priority; /* class priority */ | |
99 | unsigned char priority2; /* priority to be used after overlimit */ | |
100 | unsigned char ewma_log; /* time constant for idle time calculation */ | |
101 | unsigned char ovl_strategy; | |
102 | #ifdef CONFIG_NET_CLS_POLICE | |
103 | unsigned char police; | |
104 | #endif | |
105 | ||
106 | u32 defmap; | |
107 | ||
108 | /* Link-sharing scheduler parameters */ | |
109 | long maxidle; /* Class parameters: see below. */ | |
110 | long offtime; | |
111 | long minidle; | |
112 | u32 avpkt; | |
113 | struct qdisc_rate_table *R_tab; | |
114 | ||
115 | /* Overlimit strategy parameters */ | |
116 | void (*overlimit)(struct cbq_class *cl); | |
117 | long penalty; | |
118 | ||
119 | /* General scheduler (WRR) parameters */ | |
120 | long allot; | |
121 | long quantum; /* Allotment per WRR round */ | |
122 | long weight; /* Relative allotment: see below */ | |
123 | ||
124 | struct Qdisc *qdisc; /* Ptr to CBQ discipline */ | |
125 | struct cbq_class *split; /* Ptr to split node */ | |
126 | struct cbq_class *share; /* Ptr to LS parent in the class tree */ | |
127 | struct cbq_class *tparent; /* Ptr to tree parent in the class tree */ | |
128 | struct cbq_class *borrow; /* NULL if class is bandwidth limited; | |
129 | parent otherwise */ | |
130 | struct cbq_class *sibling; /* Sibling chain */ | |
131 | struct cbq_class *children; /* Pointer to children chain */ | |
132 | ||
133 | struct Qdisc *q; /* Elementary queueing discipline */ | |
134 | ||
135 | ||
136 | /* Variables */ | |
137 | unsigned char cpriority; /* Effective priority */ | |
138 | unsigned char delayed; | |
139 | unsigned char level; /* level of the class in hierarchy: | |
140 | 0 for leaf classes, and maximal | |
141 | level of children + 1 for nodes. | |
142 | */ | |
143 | ||
144 | psched_time_t last; /* Last end of service */ | |
145 | psched_time_t undertime; | |
146 | long avgidle; | |
147 | long deficit; /* Saved deficit for WRR */ | |
148 | unsigned long penalized; | |
149 | struct gnet_stats_basic bstats; | |
150 | struct gnet_stats_queue qstats; | |
151 | struct gnet_stats_rate_est rate_est; | |
152 | spinlock_t *stats_lock; | |
153 | struct tc_cbq_xstats xstats; | |
154 | ||
155 | struct tcf_proto *filter_list; | |
156 | ||
157 | int refcnt; | |
158 | int filters; | |
159 | ||
160 | struct cbq_class *defaults[TC_PRIO_MAX+1]; | |
161 | }; | |
162 | ||
163 | struct cbq_sched_data | |
164 | { | |
165 | struct cbq_class *classes[16]; /* Hash table of all classes */ | |
166 | int nclasses[TC_CBQ_MAXPRIO+1]; | |
167 | unsigned quanta[TC_CBQ_MAXPRIO+1]; | |
168 | ||
169 | struct cbq_class link; | |
170 | ||
171 | unsigned activemask; | |
172 | struct cbq_class *active[TC_CBQ_MAXPRIO+1]; /* List of all classes | |
173 | with backlog */ | |
174 | ||
175 | #ifdef CONFIG_NET_CLS_POLICE | |
176 | struct cbq_class *rx_class; | |
177 | #endif | |
178 | struct cbq_class *tx_class; | |
179 | struct cbq_class *tx_borrowed; | |
180 | int tx_len; | |
181 | psched_time_t now; /* Cached timestamp */ | |
182 | psched_time_t now_rt; /* Cached real time */ | |
183 | unsigned pmask; | |
184 | ||
185 | struct timer_list delay_timer; | |
186 | struct timer_list wd_timer; /* Watchdog timer, | |
187 | started when CBQ has | |
188 | backlog, but cannot | |
189 | transmit just now */ | |
190 | long wd_expires; | |
191 | int toplevel; | |
192 | u32 hgenerator; | |
193 | }; | |
194 | ||
195 | ||
196 | #define L2T(cl,len) ((cl)->R_tab->data[(len)>>(cl)->R_tab->rate.cell_log]) | |
197 | ||
198 | ||
199 | static __inline__ unsigned cbq_hash(u32 h) | |
200 | { | |
201 | h ^= h>>8; | |
202 | h ^= h>>4; | |
203 | return h&0xF; | |
204 | } | |
205 | ||
206 | static __inline__ struct cbq_class * | |
207 | cbq_class_lookup(struct cbq_sched_data *q, u32 classid) | |
208 | { | |
209 | struct cbq_class *cl; | |
210 | ||
211 | for (cl = q->classes[cbq_hash(classid)]; cl; cl = cl->next) | |
212 | if (cl->classid == classid) | |
213 | return cl; | |
214 | return NULL; | |
215 | } | |
216 | ||
217 | #ifdef CONFIG_NET_CLS_POLICE | |
218 | ||
219 | static struct cbq_class * | |
220 | cbq_reclassify(struct sk_buff *skb, struct cbq_class *this) | |
221 | { | |
222 | struct cbq_class *cl, *new; | |
223 | ||
224 | for (cl = this->tparent; cl; cl = cl->tparent) | |
225 | if ((new = cl->defaults[TC_PRIO_BESTEFFORT]) != NULL && new != this) | |
226 | return new; | |
227 | ||
228 | return NULL; | |
229 | } | |
230 | ||
231 | #endif | |
232 | ||
233 | /* Classify packet. The procedure is pretty complicated, but | |
234 | it allows us to combine link sharing and priority scheduling | |
235 | transparently. | |
236 | ||
237 | Namely, you can put link sharing rules (f.e. route based) at root of CBQ, | |
238 | so that it resolves to split nodes. Then packets are classified | |
239 | by logical priority, or a more specific classifier may be attached | |
240 | to the split node. | |
241 | */ | |
242 | ||
243 | static struct cbq_class * | |
244 | cbq_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr) | |
245 | { | |
246 | struct cbq_sched_data *q = qdisc_priv(sch); | |
247 | struct cbq_class *head = &q->link; | |
248 | struct cbq_class **defmap; | |
249 | struct cbq_class *cl = NULL; | |
250 | u32 prio = skb->priority; | |
251 | struct tcf_result res; | |
252 | ||
253 | /* | |
254 | * Step 1. If skb->priority points to one of our classes, use it. | |
255 | */ | |
256 | if (TC_H_MAJ(prio^sch->handle) == 0 && | |
257 | (cl = cbq_class_lookup(q, prio)) != NULL) | |
258 | return cl; | |
259 | ||
260 | *qerr = NET_XMIT_DROP; | |
261 | for (;;) { | |
262 | int result = 0; | |
263 | defmap = head->defaults; | |
264 | ||
265 | /* | |
266 | * Step 2+n. Apply classifier. | |
267 | */ | |
268 | if (!head->filter_list || (result = tc_classify(skb, head->filter_list, &res)) < 0) | |
269 | goto fallback; | |
270 | ||
271 | if ((cl = (void*)res.class) == NULL) { | |
272 | if (TC_H_MAJ(res.classid)) | |
273 | cl = cbq_class_lookup(q, res.classid); | |
274 | else if ((cl = defmap[res.classid&TC_PRIO_MAX]) == NULL) | |
275 | cl = defmap[TC_PRIO_BESTEFFORT]; | |
276 | ||
277 | if (cl == NULL || cl->level >= head->level) | |
278 | goto fallback; | |
279 | } | |
280 | ||
281 | #ifdef CONFIG_NET_CLS_ACT | |
282 | switch (result) { | |
283 | case TC_ACT_QUEUED: | |
284 | case TC_ACT_STOLEN: | |
285 | *qerr = NET_XMIT_SUCCESS; | |
286 | case TC_ACT_SHOT: | |
287 | return NULL; | |
288 | } | |
289 | #elif defined(CONFIG_NET_CLS_POLICE) | |
290 | switch (result) { | |
291 | case TC_POLICE_RECLASSIFY: | |
292 | return cbq_reclassify(skb, cl); | |
293 | case TC_POLICE_SHOT: | |
294 | return NULL; | |
295 | default: | |
296 | break; | |
297 | } | |
298 | #endif | |
299 | if (cl->level == 0) | |
300 | return cl; | |
301 | ||
302 | /* | |
303 | * Step 3+n. If classifier selected a link sharing class, | |
304 | * apply agency specific classifier. | |
305 | * Repeat this procdure until we hit a leaf node. | |
306 | */ | |
307 | head = cl; | |
308 | } | |
309 | ||
310 | fallback: | |
311 | cl = head; | |
312 | ||
313 | /* | |
314 | * Step 4. No success... | |
315 | */ | |
316 | if (TC_H_MAJ(prio) == 0 && | |
317 | !(cl = head->defaults[prio&TC_PRIO_MAX]) && | |
318 | !(cl = head->defaults[TC_PRIO_BESTEFFORT])) | |
319 | return head; | |
320 | ||
321 | return cl; | |
322 | } | |
323 | ||
324 | /* | |
325 | A packet has just been enqueued on the empty class. | |
326 | cbq_activate_class adds it to the tail of active class list | |
327 | of its priority band. | |
328 | */ | |
329 | ||
330 | static __inline__ void cbq_activate_class(struct cbq_class *cl) | |
331 | { | |
332 | struct cbq_sched_data *q = qdisc_priv(cl->qdisc); | |
333 | int prio = cl->cpriority; | |
334 | struct cbq_class *cl_tail; | |
335 | ||
336 | cl_tail = q->active[prio]; | |
337 | q->active[prio] = cl; | |
338 | ||
339 | if (cl_tail != NULL) { | |
340 | cl->next_alive = cl_tail->next_alive; | |
341 | cl_tail->next_alive = cl; | |
342 | } else { | |
343 | cl->next_alive = cl; | |
344 | q->activemask |= (1<<prio); | |
345 | } | |
346 | } | |
347 | ||
348 | /* | |
349 | Unlink class from active chain. | |
350 | Note that this same procedure is done directly in cbq_dequeue* | |
351 | during round-robin procedure. | |
352 | */ | |
353 | ||
354 | static void cbq_deactivate_class(struct cbq_class *this) | |
355 | { | |
356 | struct cbq_sched_data *q = qdisc_priv(this->qdisc); | |
357 | int prio = this->cpriority; | |
358 | struct cbq_class *cl; | |
359 | struct cbq_class *cl_prev = q->active[prio]; | |
360 | ||
361 | do { | |
362 | cl = cl_prev->next_alive; | |
363 | if (cl == this) { | |
364 | cl_prev->next_alive = cl->next_alive; | |
365 | cl->next_alive = NULL; | |
366 | ||
367 | if (cl == q->active[prio]) { | |
368 | q->active[prio] = cl_prev; | |
369 | if (cl == q->active[prio]) { | |
370 | q->active[prio] = NULL; | |
371 | q->activemask &= ~(1<<prio); | |
372 | return; | |
373 | } | |
374 | } | |
375 | ||
376 | cl = cl_prev->next_alive; | |
377 | return; | |
378 | } | |
379 | } while ((cl_prev = cl) != q->active[prio]); | |
380 | } | |
381 | ||
382 | static void | |
383 | cbq_mark_toplevel(struct cbq_sched_data *q, struct cbq_class *cl) | |
384 | { | |
385 | int toplevel = q->toplevel; | |
386 | ||
387 | if (toplevel > cl->level && !(cl->q->flags&TCQ_F_THROTTLED)) { | |
388 | psched_time_t now; | |
389 | psched_tdiff_t incr; | |
390 | ||
391 | PSCHED_GET_TIME(now); | |
392 | incr = PSCHED_TDIFF(now, q->now_rt); | |
393 | PSCHED_TADD2(q->now, incr, now); | |
394 | ||
395 | do { | |
396 | if (PSCHED_TLESS(cl->undertime, now)) { | |
397 | q->toplevel = cl->level; | |
398 | return; | |
399 | } | |
400 | } while ((cl=cl->borrow) != NULL && toplevel > cl->level); | |
401 | } | |
402 | } | |
403 | ||
404 | static int | |
405 | cbq_enqueue(struct sk_buff *skb, struct Qdisc *sch) | |
406 | { | |
407 | struct cbq_sched_data *q = qdisc_priv(sch); | |
408 | int len = skb->len; | |
409 | int ret; | |
410 | struct cbq_class *cl = cbq_classify(skb, sch, &ret); | |
411 | ||
412 | #ifdef CONFIG_NET_CLS_POLICE | |
413 | q->rx_class = cl; | |
414 | #endif | |
415 | if (cl == NULL) { | |
416 | if (ret == NET_XMIT_DROP) | |
417 | sch->qstats.drops++; | |
418 | kfree_skb(skb); | |
419 | return ret; | |
420 | } | |
421 | ||
422 | #ifdef CONFIG_NET_CLS_POLICE | |
423 | cl->q->__parent = sch; | |
424 | #endif | |
425 | if ((ret = cl->q->enqueue(skb, cl->q)) == NET_XMIT_SUCCESS) { | |
426 | sch->q.qlen++; | |
427 | sch->bstats.packets++; | |
428 | sch->bstats.bytes+=len; | |
429 | cbq_mark_toplevel(q, cl); | |
430 | if (!cl->next_alive) | |
431 | cbq_activate_class(cl); | |
432 | return ret; | |
433 | } | |
434 | ||
435 | sch->qstats.drops++; | |
436 | cbq_mark_toplevel(q, cl); | |
437 | cl->qstats.drops++; | |
438 | return ret; | |
439 | } | |
440 | ||
441 | static int | |
442 | cbq_requeue(struct sk_buff *skb, struct Qdisc *sch) | |
443 | { | |
444 | struct cbq_sched_data *q = qdisc_priv(sch); | |
445 | struct cbq_class *cl; | |
446 | int ret; | |
447 | ||
448 | if ((cl = q->tx_class) == NULL) { | |
449 | kfree_skb(skb); | |
450 | sch->qstats.drops++; | |
451 | return NET_XMIT_CN; | |
452 | } | |
453 | q->tx_class = NULL; | |
454 | ||
455 | cbq_mark_toplevel(q, cl); | |
456 | ||
457 | #ifdef CONFIG_NET_CLS_POLICE | |
458 | q->rx_class = cl; | |
459 | cl->q->__parent = sch; | |
460 | #endif | |
461 | if ((ret = cl->q->ops->requeue(skb, cl->q)) == 0) { | |
462 | sch->q.qlen++; | |
463 | sch->qstats.requeues++; | |
464 | if (!cl->next_alive) | |
465 | cbq_activate_class(cl); | |
466 | return 0; | |
467 | } | |
468 | sch->qstats.drops++; | |
469 | cl->qstats.drops++; | |
470 | return ret; | |
471 | } | |
472 | ||
473 | /* Overlimit actions */ | |
474 | ||
475 | /* TC_CBQ_OVL_CLASSIC: (default) penalize leaf class by adding offtime */ | |
476 | ||
477 | static void cbq_ovl_classic(struct cbq_class *cl) | |
478 | { | |
479 | struct cbq_sched_data *q = qdisc_priv(cl->qdisc); | |
480 | psched_tdiff_t delay = PSCHED_TDIFF(cl->undertime, q->now); | |
481 | ||
482 | if (!cl->delayed) { | |
483 | delay += cl->offtime; | |
484 | ||
485 | /* | |
486 | Class goes to sleep, so that it will have no | |
487 | chance to work avgidle. Let's forgive it 8) | |
488 | ||
489 | BTW cbq-2.0 has a crap in this | |
490 | place, apparently they forgot to shift it by cl->ewma_log. | |
491 | */ | |
492 | if (cl->avgidle < 0) | |
493 | delay -= (-cl->avgidle) - ((-cl->avgidle) >> cl->ewma_log); | |
494 | if (cl->avgidle < cl->minidle) | |
495 | cl->avgidle = cl->minidle; | |
496 | if (delay <= 0) | |
497 | delay = 1; | |
498 | PSCHED_TADD2(q->now, delay, cl->undertime); | |
499 | ||
500 | cl->xstats.overactions++; | |
501 | cl->delayed = 1; | |
502 | } | |
503 | if (q->wd_expires == 0 || q->wd_expires > delay) | |
504 | q->wd_expires = delay; | |
505 | ||
506 | /* Dirty work! We must schedule wakeups based on | |
507 | real available rate, rather than leaf rate, | |
508 | which may be tiny (even zero). | |
509 | */ | |
510 | if (q->toplevel == TC_CBQ_MAXLEVEL) { | |
511 | struct cbq_class *b; | |
512 | psched_tdiff_t base_delay = q->wd_expires; | |
513 | ||
514 | for (b = cl->borrow; b; b = b->borrow) { | |
515 | delay = PSCHED_TDIFF(b->undertime, q->now); | |
516 | if (delay < base_delay) { | |
517 | if (delay <= 0) | |
518 | delay = 1; | |
519 | base_delay = delay; | |
520 | } | |
521 | } | |
522 | ||
523 | q->wd_expires = base_delay; | |
524 | } | |
525 | } | |
526 | ||
527 | /* TC_CBQ_OVL_RCLASSIC: penalize by offtime classes in hierarchy, when | |
528 | they go overlimit | |
529 | */ | |
530 | ||
531 | static void cbq_ovl_rclassic(struct cbq_class *cl) | |
532 | { | |
533 | struct cbq_sched_data *q = qdisc_priv(cl->qdisc); | |
534 | struct cbq_class *this = cl; | |
535 | ||
536 | do { | |
537 | if (cl->level > q->toplevel) { | |
538 | cl = NULL; | |
539 | break; | |
540 | } | |
541 | } while ((cl = cl->borrow) != NULL); | |
542 | ||
543 | if (cl == NULL) | |
544 | cl = this; | |
545 | cbq_ovl_classic(cl); | |
546 | } | |
547 | ||
548 | /* TC_CBQ_OVL_DELAY: delay until it will go to underlimit */ | |
549 | ||
550 | static void cbq_ovl_delay(struct cbq_class *cl) | |
551 | { | |
552 | struct cbq_sched_data *q = qdisc_priv(cl->qdisc); | |
553 | psched_tdiff_t delay = PSCHED_TDIFF(cl->undertime, q->now); | |
554 | ||
555 | if (!cl->delayed) { | |
556 | unsigned long sched = jiffies; | |
557 | ||
558 | delay += cl->offtime; | |
559 | if (cl->avgidle < 0) | |
560 | delay -= (-cl->avgidle) - ((-cl->avgidle) >> cl->ewma_log); | |
561 | if (cl->avgidle < cl->minidle) | |
562 | cl->avgidle = cl->minidle; | |
563 | PSCHED_TADD2(q->now, delay, cl->undertime); | |
564 | ||
565 | if (delay > 0) { | |
566 | sched += PSCHED_US2JIFFIE(delay) + cl->penalty; | |
567 | cl->penalized = sched; | |
568 | cl->cpriority = TC_CBQ_MAXPRIO; | |
569 | q->pmask |= (1<<TC_CBQ_MAXPRIO); | |
570 | if (del_timer(&q->delay_timer) && | |
571 | (long)(q->delay_timer.expires - sched) > 0) | |
572 | q->delay_timer.expires = sched; | |
573 | add_timer(&q->delay_timer); | |
574 | cl->delayed = 1; | |
575 | cl->xstats.overactions++; | |
576 | return; | |
577 | } | |
578 | delay = 1; | |
579 | } | |
580 | if (q->wd_expires == 0 || q->wd_expires > delay) | |
581 | q->wd_expires = delay; | |
582 | } | |
583 | ||
584 | /* TC_CBQ_OVL_LOWPRIO: penalize class by lowering its priority band */ | |
585 | ||
586 | static void cbq_ovl_lowprio(struct cbq_class *cl) | |
587 | { | |
588 | struct cbq_sched_data *q = qdisc_priv(cl->qdisc); | |
589 | ||
590 | cl->penalized = jiffies + cl->penalty; | |
591 | ||
592 | if (cl->cpriority != cl->priority2) { | |
593 | cl->cpriority = cl->priority2; | |
594 | q->pmask |= (1<<cl->cpriority); | |
595 | cl->xstats.overactions++; | |
596 | } | |
597 | cbq_ovl_classic(cl); | |
598 | } | |
599 | ||
600 | /* TC_CBQ_OVL_DROP: penalize class by dropping */ | |
601 | ||
602 | static void cbq_ovl_drop(struct cbq_class *cl) | |
603 | { | |
604 | if (cl->q->ops->drop) | |
605 | if (cl->q->ops->drop(cl->q)) | |
606 | cl->qdisc->q.qlen--; | |
607 | cl->xstats.overactions++; | |
608 | cbq_ovl_classic(cl); | |
609 | } | |
610 | ||
611 | static void cbq_watchdog(unsigned long arg) | |
612 | { | |
613 | struct Qdisc *sch = (struct Qdisc*)arg; | |
614 | ||
615 | sch->flags &= ~TCQ_F_THROTTLED; | |
616 | netif_schedule(sch->dev); | |
617 | } | |
618 | ||
619 | static unsigned long cbq_undelay_prio(struct cbq_sched_data *q, int prio) | |
620 | { | |
621 | struct cbq_class *cl; | |
622 | struct cbq_class *cl_prev = q->active[prio]; | |
623 | unsigned long now = jiffies; | |
624 | unsigned long sched = now; | |
625 | ||
626 | if (cl_prev == NULL) | |
627 | return now; | |
628 | ||
629 | do { | |
630 | cl = cl_prev->next_alive; | |
631 | if ((long)(now - cl->penalized) > 0) { | |
632 | cl_prev->next_alive = cl->next_alive; | |
633 | cl->next_alive = NULL; | |
634 | cl->cpriority = cl->priority; | |
635 | cl->delayed = 0; | |
636 | cbq_activate_class(cl); | |
637 | ||
638 | if (cl == q->active[prio]) { | |
639 | q->active[prio] = cl_prev; | |
640 | if (cl == q->active[prio]) { | |
641 | q->active[prio] = NULL; | |
642 | return 0; | |
643 | } | |
644 | } | |
645 | ||
646 | cl = cl_prev->next_alive; | |
647 | } else if ((long)(sched - cl->penalized) > 0) | |
648 | sched = cl->penalized; | |
649 | } while ((cl_prev = cl) != q->active[prio]); | |
650 | ||
651 | return (long)(sched - now); | |
652 | } | |
653 | ||
654 | static void cbq_undelay(unsigned long arg) | |
655 | { | |
656 | struct Qdisc *sch = (struct Qdisc*)arg; | |
657 | struct cbq_sched_data *q = qdisc_priv(sch); | |
658 | long delay = 0; | |
659 | unsigned pmask; | |
660 | ||
661 | pmask = q->pmask; | |
662 | q->pmask = 0; | |
663 | ||
664 | while (pmask) { | |
665 | int prio = ffz(~pmask); | |
666 | long tmp; | |
667 | ||
668 | pmask &= ~(1<<prio); | |
669 | ||
670 | tmp = cbq_undelay_prio(q, prio); | |
671 | if (tmp > 0) { | |
672 | q->pmask |= 1<<prio; | |
673 | if (tmp < delay || delay == 0) | |
674 | delay = tmp; | |
675 | } | |
676 | } | |
677 | ||
678 | if (delay) { | |
679 | q->delay_timer.expires = jiffies + delay; | |
680 | add_timer(&q->delay_timer); | |
681 | } | |
682 | ||
683 | sch->flags &= ~TCQ_F_THROTTLED; | |
684 | netif_schedule(sch->dev); | |
685 | } | |
686 | ||
687 | ||
688 | #ifdef CONFIG_NET_CLS_POLICE | |
689 | ||
690 | static int cbq_reshape_fail(struct sk_buff *skb, struct Qdisc *child) | |
691 | { | |
692 | int len = skb->len; | |
693 | struct Qdisc *sch = child->__parent; | |
694 | struct cbq_sched_data *q = qdisc_priv(sch); | |
695 | struct cbq_class *cl = q->rx_class; | |
696 | ||
697 | q->rx_class = NULL; | |
698 | ||
699 | if (cl && (cl = cbq_reclassify(skb, cl)) != NULL) { | |
700 | ||
701 | cbq_mark_toplevel(q, cl); | |
702 | ||
703 | q->rx_class = cl; | |
704 | cl->q->__parent = sch; | |
705 | ||
706 | if (cl->q->enqueue(skb, cl->q) == 0) { | |
707 | sch->q.qlen++; | |
708 | sch->bstats.packets++; | |
709 | sch->bstats.bytes+=len; | |
710 | if (!cl->next_alive) | |
711 | cbq_activate_class(cl); | |
712 | return 0; | |
713 | } | |
714 | sch->qstats.drops++; | |
715 | return 0; | |
716 | } | |
717 | ||
718 | sch->qstats.drops++; | |
719 | return -1; | |
720 | } | |
721 | #endif | |
722 | ||
723 | /* | |
724 | It is mission critical procedure. | |
725 | ||
726 | We "regenerate" toplevel cutoff, if transmitting class | |
727 | has backlog and it is not regulated. It is not part of | |
728 | original CBQ description, but looks more reasonable. | |
729 | Probably, it is wrong. This question needs further investigation. | |
730 | */ | |
731 | ||
732 | static __inline__ void | |
733 | cbq_update_toplevel(struct cbq_sched_data *q, struct cbq_class *cl, | |
734 | struct cbq_class *borrowed) | |
735 | { | |
736 | if (cl && q->toplevel >= borrowed->level) { | |
737 | if (cl->q->q.qlen > 1) { | |
738 | do { | |
739 | if (PSCHED_IS_PASTPERFECT(borrowed->undertime)) { | |
740 | q->toplevel = borrowed->level; | |
741 | return; | |
742 | } | |
743 | } while ((borrowed=borrowed->borrow) != NULL); | |
744 | } | |
745 | #if 0 | |
746 | /* It is not necessary now. Uncommenting it | |
747 | will save CPU cycles, but decrease fairness. | |
748 | */ | |
749 | q->toplevel = TC_CBQ_MAXLEVEL; | |
750 | #endif | |
751 | } | |
752 | } | |
753 | ||
754 | static void | |
755 | cbq_update(struct cbq_sched_data *q) | |
756 | { | |
757 | struct cbq_class *this = q->tx_class; | |
758 | struct cbq_class *cl = this; | |
759 | int len = q->tx_len; | |
760 | ||
761 | q->tx_class = NULL; | |
762 | ||
763 | for ( ; cl; cl = cl->share) { | |
764 | long avgidle = cl->avgidle; | |
765 | long idle; | |
766 | ||
767 | cl->bstats.packets++; | |
768 | cl->bstats.bytes += len; | |
769 | ||
770 | /* | |
771 | (now - last) is total time between packet right edges. | |
772 | (last_pktlen/rate) is "virtual" busy time, so that | |
773 | ||
774 | idle = (now - last) - last_pktlen/rate | |
775 | */ | |
776 | ||
777 | idle = PSCHED_TDIFF(q->now, cl->last); | |
778 | if ((unsigned long)idle > 128*1024*1024) { | |
779 | avgidle = cl->maxidle; | |
780 | } else { | |
781 | idle -= L2T(cl, len); | |
782 | ||
783 | /* true_avgidle := (1-W)*true_avgidle + W*idle, | |
784 | where W=2^{-ewma_log}. But cl->avgidle is scaled: | |
785 | cl->avgidle == true_avgidle/W, | |
786 | hence: | |
787 | */ | |
788 | avgidle += idle - (avgidle>>cl->ewma_log); | |
789 | } | |
790 | ||
791 | if (avgidle <= 0) { | |
792 | /* Overlimit or at-limit */ | |
793 | ||
794 | if (avgidle < cl->minidle) | |
795 | avgidle = cl->minidle; | |
796 | ||
797 | cl->avgidle = avgidle; | |
798 | ||
799 | /* Calculate expected time, when this class | |
800 | will be allowed to send. | |
801 | It will occur, when: | |
802 | (1-W)*true_avgidle + W*delay = 0, i.e. | |
803 | idle = (1/W - 1)*(-true_avgidle) | |
804 | or | |
805 | idle = (1 - W)*(-cl->avgidle); | |
806 | */ | |
807 | idle = (-avgidle) - ((-avgidle) >> cl->ewma_log); | |
808 | ||
809 | /* | |
810 | That is not all. | |
811 | To maintain the rate allocated to the class, | |
812 | we add to undertime virtual clock, | |
813 | necessary to complete transmitted packet. | |
814 | (len/phys_bandwidth has been already passed | |
815 | to the moment of cbq_update) | |
816 | */ | |
817 | ||
818 | idle -= L2T(&q->link, len); | |
819 | idle += L2T(cl, len); | |
820 | ||
821 | PSCHED_AUDIT_TDIFF(idle); | |
822 | ||
823 | PSCHED_TADD2(q->now, idle, cl->undertime); | |
824 | } else { | |
825 | /* Underlimit */ | |
826 | ||
827 | PSCHED_SET_PASTPERFECT(cl->undertime); | |
828 | if (avgidle > cl->maxidle) | |
829 | cl->avgidle = cl->maxidle; | |
830 | else | |
831 | cl->avgidle = avgidle; | |
832 | } | |
833 | cl->last = q->now; | |
834 | } | |
835 | ||
836 | cbq_update_toplevel(q, this, q->tx_borrowed); | |
837 | } | |
838 | ||
839 | static __inline__ struct cbq_class * | |
840 | cbq_under_limit(struct cbq_class *cl) | |
841 | { | |
842 | struct cbq_sched_data *q = qdisc_priv(cl->qdisc); | |
843 | struct cbq_class *this_cl = cl; | |
844 | ||
845 | if (cl->tparent == NULL) | |
846 | return cl; | |
847 | ||
848 | if (PSCHED_IS_PASTPERFECT(cl->undertime) || | |
849 | !PSCHED_TLESS(q->now, cl->undertime)) { | |
850 | cl->delayed = 0; | |
851 | return cl; | |
852 | } | |
853 | ||
854 | do { | |
855 | /* It is very suspicious place. Now overlimit | |
856 | action is generated for not bounded classes | |
857 | only if link is completely congested. | |
858 | Though it is in agree with ancestor-only paradigm, | |
859 | it looks very stupid. Particularly, | |
860 | it means that this chunk of code will either | |
861 | never be called or result in strong amplification | |
862 | of burstiness. Dangerous, silly, and, however, | |
863 | no another solution exists. | |
864 | */ | |
865 | if ((cl = cl->borrow) == NULL) { | |
866 | this_cl->qstats.overlimits++; | |
867 | this_cl->overlimit(this_cl); | |
868 | return NULL; | |
869 | } | |
870 | if (cl->level > q->toplevel) | |
871 | return NULL; | |
872 | } while (!PSCHED_IS_PASTPERFECT(cl->undertime) && | |
873 | PSCHED_TLESS(q->now, cl->undertime)); | |
874 | ||
875 | cl->delayed = 0; | |
876 | return cl; | |
877 | } | |
878 | ||
879 | static __inline__ struct sk_buff * | |
880 | cbq_dequeue_prio(struct Qdisc *sch, int prio) | |
881 | { | |
882 | struct cbq_sched_data *q = qdisc_priv(sch); | |
883 | struct cbq_class *cl_tail, *cl_prev, *cl; | |
884 | struct sk_buff *skb; | |
885 | int deficit; | |
886 | ||
887 | cl_tail = cl_prev = q->active[prio]; | |
888 | cl = cl_prev->next_alive; | |
889 | ||
890 | do { | |
891 | deficit = 0; | |
892 | ||
893 | /* Start round */ | |
894 | do { | |
895 | struct cbq_class *borrow = cl; | |
896 | ||
897 | if (cl->q->q.qlen && | |
898 | (borrow = cbq_under_limit(cl)) == NULL) | |
899 | goto skip_class; | |
900 | ||
901 | if (cl->deficit <= 0) { | |
902 | /* Class exhausted its allotment per | |
903 | this round. Switch to the next one. | |
904 | */ | |
905 | deficit = 1; | |
906 | cl->deficit += cl->quantum; | |
907 | goto next_class; | |
908 | } | |
909 | ||
910 | skb = cl->q->dequeue(cl->q); | |
911 | ||
912 | /* Class did not give us any skb :-( | |
913 | It could occur even if cl->q->q.qlen != 0 | |
914 | f.e. if cl->q == "tbf" | |
915 | */ | |
916 | if (skb == NULL) | |
917 | goto skip_class; | |
918 | ||
919 | cl->deficit -= skb->len; | |
920 | q->tx_class = cl; | |
921 | q->tx_borrowed = borrow; | |
922 | if (borrow != cl) { | |
923 | #ifndef CBQ_XSTATS_BORROWS_BYTES | |
924 | borrow->xstats.borrows++; | |
925 | cl->xstats.borrows++; | |
926 | #else | |
927 | borrow->xstats.borrows += skb->len; | |
928 | cl->xstats.borrows += skb->len; | |
929 | #endif | |
930 | } | |
931 | q->tx_len = skb->len; | |
932 | ||
933 | if (cl->deficit <= 0) { | |
934 | q->active[prio] = cl; | |
935 | cl = cl->next_alive; | |
936 | cl->deficit += cl->quantum; | |
937 | } | |
938 | return skb; | |
939 | ||
940 | skip_class: | |
941 | if (cl->q->q.qlen == 0 || prio != cl->cpriority) { | |
942 | /* Class is empty or penalized. | |
943 | Unlink it from active chain. | |
944 | */ | |
945 | cl_prev->next_alive = cl->next_alive; | |
946 | cl->next_alive = NULL; | |
947 | ||
948 | /* Did cl_tail point to it? */ | |
949 | if (cl == cl_tail) { | |
950 | /* Repair it! */ | |
951 | cl_tail = cl_prev; | |
952 | ||
953 | /* Was it the last class in this band? */ | |
954 | if (cl == cl_tail) { | |
955 | /* Kill the band! */ | |
956 | q->active[prio] = NULL; | |
957 | q->activemask &= ~(1<<prio); | |
958 | if (cl->q->q.qlen) | |
959 | cbq_activate_class(cl); | |
960 | return NULL; | |
961 | } | |
962 | ||
963 | q->active[prio] = cl_tail; | |
964 | } | |
965 | if (cl->q->q.qlen) | |
966 | cbq_activate_class(cl); | |
967 | ||
968 | cl = cl_prev; | |
969 | } | |
970 | ||
971 | next_class: | |
972 | cl_prev = cl; | |
973 | cl = cl->next_alive; | |
974 | } while (cl_prev != cl_tail); | |
975 | } while (deficit); | |
976 | ||
977 | q->active[prio] = cl_prev; | |
978 | ||
979 | return NULL; | |
980 | } | |
981 | ||
982 | static __inline__ struct sk_buff * | |
983 | cbq_dequeue_1(struct Qdisc *sch) | |
984 | { | |
985 | struct cbq_sched_data *q = qdisc_priv(sch); | |
986 | struct sk_buff *skb; | |
987 | unsigned activemask; | |
988 | ||
989 | activemask = q->activemask&0xFF; | |
990 | while (activemask) { | |
991 | int prio = ffz(~activemask); | |
992 | activemask &= ~(1<<prio); | |
993 | skb = cbq_dequeue_prio(sch, prio); | |
994 | if (skb) | |
995 | return skb; | |
996 | } | |
997 | return NULL; | |
998 | } | |
999 | ||
1000 | static struct sk_buff * | |
1001 | cbq_dequeue(struct Qdisc *sch) | |
1002 | { | |
1003 | struct sk_buff *skb; | |
1004 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1005 | psched_time_t now; | |
1006 | psched_tdiff_t incr; | |
1007 | ||
1008 | PSCHED_GET_TIME(now); | |
1009 | incr = PSCHED_TDIFF(now, q->now_rt); | |
1010 | ||
1011 | if (q->tx_class) { | |
1012 | psched_tdiff_t incr2; | |
1013 | /* Time integrator. We calculate EOS time | |
1014 | by adding expected packet transmission time. | |
1015 | If real time is greater, we warp artificial clock, | |
1016 | so that: | |
1017 | ||
1018 | cbq_time = max(real_time, work); | |
1019 | */ | |
1020 | incr2 = L2T(&q->link, q->tx_len); | |
1021 | PSCHED_TADD(q->now, incr2); | |
1022 | cbq_update(q); | |
1023 | if ((incr -= incr2) < 0) | |
1024 | incr = 0; | |
1025 | } | |
1026 | PSCHED_TADD(q->now, incr); | |
1027 | q->now_rt = now; | |
1028 | ||
1029 | for (;;) { | |
1030 | q->wd_expires = 0; | |
1031 | ||
1032 | skb = cbq_dequeue_1(sch); | |
1033 | if (skb) { | |
1034 | sch->q.qlen--; | |
1035 | sch->flags &= ~TCQ_F_THROTTLED; | |
1036 | return skb; | |
1037 | } | |
1038 | ||
1039 | /* All the classes are overlimit. | |
1040 | ||
1041 | It is possible, if: | |
1042 | ||
1043 | 1. Scheduler is empty. | |
1044 | 2. Toplevel cutoff inhibited borrowing. | |
1045 | 3. Root class is overlimit. | |
1046 | ||
1047 | Reset 2d and 3d conditions and retry. | |
1048 | ||
1049 | Note, that NS and cbq-2.0 are buggy, peeking | |
1050 | an arbitrary class is appropriate for ancestor-only | |
1051 | sharing, but not for toplevel algorithm. | |
1052 | ||
1053 | Our version is better, but slower, because it requires | |
1054 | two passes, but it is unavoidable with top-level sharing. | |
1055 | */ | |
1056 | ||
1057 | if (q->toplevel == TC_CBQ_MAXLEVEL && | |
1058 | PSCHED_IS_PASTPERFECT(q->link.undertime)) | |
1059 | break; | |
1060 | ||
1061 | q->toplevel = TC_CBQ_MAXLEVEL; | |
1062 | PSCHED_SET_PASTPERFECT(q->link.undertime); | |
1063 | } | |
1064 | ||
1065 | /* No packets in scheduler or nobody wants to give them to us :-( | |
1066 | Sigh... start watchdog timer in the last case. */ | |
1067 | ||
1068 | if (sch->q.qlen) { | |
1069 | sch->qstats.overlimits++; | |
1070 | if (q->wd_expires) { | |
1071 | long delay = PSCHED_US2JIFFIE(q->wd_expires); | |
1072 | if (delay <= 0) | |
1073 | delay = 1; | |
1074 | mod_timer(&q->wd_timer, jiffies + delay); | |
1075 | sch->flags |= TCQ_F_THROTTLED; | |
1076 | } | |
1077 | } | |
1078 | return NULL; | |
1079 | } | |
1080 | ||
1081 | /* CBQ class maintanance routines */ | |
1082 | ||
1083 | static void cbq_adjust_levels(struct cbq_class *this) | |
1084 | { | |
1085 | if (this == NULL) | |
1086 | return; | |
1087 | ||
1088 | do { | |
1089 | int level = 0; | |
1090 | struct cbq_class *cl; | |
1091 | ||
1092 | if ((cl = this->children) != NULL) { | |
1093 | do { | |
1094 | if (cl->level > level) | |
1095 | level = cl->level; | |
1096 | } while ((cl = cl->sibling) != this->children); | |
1097 | } | |
1098 | this->level = level+1; | |
1099 | } while ((this = this->tparent) != NULL); | |
1100 | } | |
1101 | ||
1102 | static void cbq_normalize_quanta(struct cbq_sched_data *q, int prio) | |
1103 | { | |
1104 | struct cbq_class *cl; | |
1105 | unsigned h; | |
1106 | ||
1107 | if (q->quanta[prio] == 0) | |
1108 | return; | |
1109 | ||
1110 | for (h=0; h<16; h++) { | |
1111 | for (cl = q->classes[h]; cl; cl = cl->next) { | |
1112 | /* BUGGGG... Beware! This expression suffer of | |
1113 | arithmetic overflows! | |
1114 | */ | |
1115 | if (cl->priority == prio) { | |
1116 | cl->quantum = (cl->weight*cl->allot*q->nclasses[prio])/ | |
1117 | q->quanta[prio]; | |
1118 | } | |
1119 | if (cl->quantum <= 0 || cl->quantum>32*cl->qdisc->dev->mtu) { | |
1120 | printk(KERN_WARNING "CBQ: class %08x has bad quantum==%ld, repaired.\n", cl->classid, cl->quantum); | |
1121 | cl->quantum = cl->qdisc->dev->mtu/2 + 1; | |
1122 | } | |
1123 | } | |
1124 | } | |
1125 | } | |
1126 | ||
1127 | static void cbq_sync_defmap(struct cbq_class *cl) | |
1128 | { | |
1129 | struct cbq_sched_data *q = qdisc_priv(cl->qdisc); | |
1130 | struct cbq_class *split = cl->split; | |
1131 | unsigned h; | |
1132 | int i; | |
1133 | ||
1134 | if (split == NULL) | |
1135 | return; | |
1136 | ||
1137 | for (i=0; i<=TC_PRIO_MAX; i++) { | |
1138 | if (split->defaults[i] == cl && !(cl->defmap&(1<<i))) | |
1139 | split->defaults[i] = NULL; | |
1140 | } | |
1141 | ||
1142 | for (i=0; i<=TC_PRIO_MAX; i++) { | |
1143 | int level = split->level; | |
1144 | ||
1145 | if (split->defaults[i]) | |
1146 | continue; | |
1147 | ||
1148 | for (h=0; h<16; h++) { | |
1149 | struct cbq_class *c; | |
1150 | ||
1151 | for (c = q->classes[h]; c; c = c->next) { | |
1152 | if (c->split == split && c->level < level && | |
1153 | c->defmap&(1<<i)) { | |
1154 | split->defaults[i] = c; | |
1155 | level = c->level; | |
1156 | } | |
1157 | } | |
1158 | } | |
1159 | } | |
1160 | } | |
1161 | ||
1162 | static void cbq_change_defmap(struct cbq_class *cl, u32 splitid, u32 def, u32 mask) | |
1163 | { | |
1164 | struct cbq_class *split = NULL; | |
1165 | ||
1166 | if (splitid == 0) { | |
1167 | if ((split = cl->split) == NULL) | |
1168 | return; | |
1169 | splitid = split->classid; | |
1170 | } | |
1171 | ||
1172 | if (split == NULL || split->classid != splitid) { | |
1173 | for (split = cl->tparent; split; split = split->tparent) | |
1174 | if (split->classid == splitid) | |
1175 | break; | |
1176 | } | |
1177 | ||
1178 | if (split == NULL) | |
1179 | return; | |
1180 | ||
1181 | if (cl->split != split) { | |
1182 | cl->defmap = 0; | |
1183 | cbq_sync_defmap(cl); | |
1184 | cl->split = split; | |
1185 | cl->defmap = def&mask; | |
1186 | } else | |
1187 | cl->defmap = (cl->defmap&~mask)|(def&mask); | |
1188 | ||
1189 | cbq_sync_defmap(cl); | |
1190 | } | |
1191 | ||
1192 | static void cbq_unlink_class(struct cbq_class *this) | |
1193 | { | |
1194 | struct cbq_class *cl, **clp; | |
1195 | struct cbq_sched_data *q = qdisc_priv(this->qdisc); | |
1196 | ||
1197 | for (clp = &q->classes[cbq_hash(this->classid)]; (cl = *clp) != NULL; clp = &cl->next) { | |
1198 | if (cl == this) { | |
1199 | *clp = cl->next; | |
1200 | cl->next = NULL; | |
1201 | break; | |
1202 | } | |
1203 | } | |
1204 | ||
1205 | if (this->tparent) { | |
1206 | clp=&this->sibling; | |
1207 | cl = *clp; | |
1208 | do { | |
1209 | if (cl == this) { | |
1210 | *clp = cl->sibling; | |
1211 | break; | |
1212 | } | |
1213 | clp = &cl->sibling; | |
1214 | } while ((cl = *clp) != this->sibling); | |
1215 | ||
1216 | if (this->tparent->children == this) { | |
1217 | this->tparent->children = this->sibling; | |
1218 | if (this->sibling == this) | |
1219 | this->tparent->children = NULL; | |
1220 | } | |
1221 | } else { | |
1222 | BUG_TRAP(this->sibling == this); | |
1223 | } | |
1224 | } | |
1225 | ||
1226 | static void cbq_link_class(struct cbq_class *this) | |
1227 | { | |
1228 | struct cbq_sched_data *q = qdisc_priv(this->qdisc); | |
1229 | unsigned h = cbq_hash(this->classid); | |
1230 | struct cbq_class *parent = this->tparent; | |
1231 | ||
1232 | this->sibling = this; | |
1233 | this->next = q->classes[h]; | |
1234 | q->classes[h] = this; | |
1235 | ||
1236 | if (parent == NULL) | |
1237 | return; | |
1238 | ||
1239 | if (parent->children == NULL) { | |
1240 | parent->children = this; | |
1241 | } else { | |
1242 | this->sibling = parent->children->sibling; | |
1243 | parent->children->sibling = this; | |
1244 | } | |
1245 | } | |
1246 | ||
1247 | static unsigned int cbq_drop(struct Qdisc* sch) | |
1248 | { | |
1249 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1250 | struct cbq_class *cl, *cl_head; | |
1251 | int prio; | |
1252 | unsigned int len; | |
1253 | ||
1254 | for (prio = TC_CBQ_MAXPRIO; prio >= 0; prio--) { | |
1255 | if ((cl_head = q->active[prio]) == NULL) | |
1256 | continue; | |
1257 | ||
1258 | cl = cl_head; | |
1259 | do { | |
1260 | if (cl->q->ops->drop && (len = cl->q->ops->drop(cl->q))) { | |
1261 | sch->q.qlen--; | |
1262 | return len; | |
1263 | } | |
1264 | } while ((cl = cl->next_alive) != cl_head); | |
1265 | } | |
1266 | return 0; | |
1267 | } | |
1268 | ||
1269 | static void | |
1270 | cbq_reset(struct Qdisc* sch) | |
1271 | { | |
1272 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1273 | struct cbq_class *cl; | |
1274 | int prio; | |
1275 | unsigned h; | |
1276 | ||
1277 | q->activemask = 0; | |
1278 | q->pmask = 0; | |
1279 | q->tx_class = NULL; | |
1280 | q->tx_borrowed = NULL; | |
1281 | del_timer(&q->wd_timer); | |
1282 | del_timer(&q->delay_timer); | |
1283 | q->toplevel = TC_CBQ_MAXLEVEL; | |
1284 | PSCHED_GET_TIME(q->now); | |
1285 | q->now_rt = q->now; | |
1286 | ||
1287 | for (prio = 0; prio <= TC_CBQ_MAXPRIO; prio++) | |
1288 | q->active[prio] = NULL; | |
1289 | ||
1290 | for (h = 0; h < 16; h++) { | |
1291 | for (cl = q->classes[h]; cl; cl = cl->next) { | |
1292 | qdisc_reset(cl->q); | |
1293 | ||
1294 | cl->next_alive = NULL; | |
1295 | PSCHED_SET_PASTPERFECT(cl->undertime); | |
1296 | cl->avgidle = cl->maxidle; | |
1297 | cl->deficit = cl->quantum; | |
1298 | cl->cpriority = cl->priority; | |
1299 | } | |
1300 | } | |
1301 | sch->q.qlen = 0; | |
1302 | } | |
1303 | ||
1304 | ||
1305 | static int cbq_set_lss(struct cbq_class *cl, struct tc_cbq_lssopt *lss) | |
1306 | { | |
1307 | if (lss->change&TCF_CBQ_LSS_FLAGS) { | |
1308 | cl->share = (lss->flags&TCF_CBQ_LSS_ISOLATED) ? NULL : cl->tparent; | |
1309 | cl->borrow = (lss->flags&TCF_CBQ_LSS_BOUNDED) ? NULL : cl->tparent; | |
1310 | } | |
1311 | if (lss->change&TCF_CBQ_LSS_EWMA) | |
1312 | cl->ewma_log = lss->ewma_log; | |
1313 | if (lss->change&TCF_CBQ_LSS_AVPKT) | |
1314 | cl->avpkt = lss->avpkt; | |
1315 | if (lss->change&TCF_CBQ_LSS_MINIDLE) | |
1316 | cl->minidle = -(long)lss->minidle; | |
1317 | if (lss->change&TCF_CBQ_LSS_MAXIDLE) { | |
1318 | cl->maxidle = lss->maxidle; | |
1319 | cl->avgidle = lss->maxidle; | |
1320 | } | |
1321 | if (lss->change&TCF_CBQ_LSS_OFFTIME) | |
1322 | cl->offtime = lss->offtime; | |
1323 | return 0; | |
1324 | } | |
1325 | ||
1326 | static void cbq_rmprio(struct cbq_sched_data *q, struct cbq_class *cl) | |
1327 | { | |
1328 | q->nclasses[cl->priority]--; | |
1329 | q->quanta[cl->priority] -= cl->weight; | |
1330 | cbq_normalize_quanta(q, cl->priority); | |
1331 | } | |
1332 | ||
1333 | static void cbq_addprio(struct cbq_sched_data *q, struct cbq_class *cl) | |
1334 | { | |
1335 | q->nclasses[cl->priority]++; | |
1336 | q->quanta[cl->priority] += cl->weight; | |
1337 | cbq_normalize_quanta(q, cl->priority); | |
1338 | } | |
1339 | ||
1340 | static int cbq_set_wrr(struct cbq_class *cl, struct tc_cbq_wrropt *wrr) | |
1341 | { | |
1342 | struct cbq_sched_data *q = qdisc_priv(cl->qdisc); | |
1343 | ||
1344 | if (wrr->allot) | |
1345 | cl->allot = wrr->allot; | |
1346 | if (wrr->weight) | |
1347 | cl->weight = wrr->weight; | |
1348 | if (wrr->priority) { | |
1349 | cl->priority = wrr->priority-1; | |
1350 | cl->cpriority = cl->priority; | |
1351 | if (cl->priority >= cl->priority2) | |
1352 | cl->priority2 = TC_CBQ_MAXPRIO-1; | |
1353 | } | |
1354 | ||
1355 | cbq_addprio(q, cl); | |
1356 | return 0; | |
1357 | } | |
1358 | ||
1359 | static int cbq_set_overlimit(struct cbq_class *cl, struct tc_cbq_ovl *ovl) | |
1360 | { | |
1361 | switch (ovl->strategy) { | |
1362 | case TC_CBQ_OVL_CLASSIC: | |
1363 | cl->overlimit = cbq_ovl_classic; | |
1364 | break; | |
1365 | case TC_CBQ_OVL_DELAY: | |
1366 | cl->overlimit = cbq_ovl_delay; | |
1367 | break; | |
1368 | case TC_CBQ_OVL_LOWPRIO: | |
1369 | if (ovl->priority2-1 >= TC_CBQ_MAXPRIO || | |
1370 | ovl->priority2-1 <= cl->priority) | |
1371 | return -EINVAL; | |
1372 | cl->priority2 = ovl->priority2-1; | |
1373 | cl->overlimit = cbq_ovl_lowprio; | |
1374 | break; | |
1375 | case TC_CBQ_OVL_DROP: | |
1376 | cl->overlimit = cbq_ovl_drop; | |
1377 | break; | |
1378 | case TC_CBQ_OVL_RCLASSIC: | |
1379 | cl->overlimit = cbq_ovl_rclassic; | |
1380 | break; | |
1381 | default: | |
1382 | return -EINVAL; | |
1383 | } | |
1384 | cl->penalty = (ovl->penalty*HZ)/1000; | |
1385 | return 0; | |
1386 | } | |
1387 | ||
1388 | #ifdef CONFIG_NET_CLS_POLICE | |
1389 | static int cbq_set_police(struct cbq_class *cl, struct tc_cbq_police *p) | |
1390 | { | |
1391 | cl->police = p->police; | |
1392 | ||
1393 | if (cl->q->handle) { | |
1394 | if (p->police == TC_POLICE_RECLASSIFY) | |
1395 | cl->q->reshape_fail = cbq_reshape_fail; | |
1396 | else | |
1397 | cl->q->reshape_fail = NULL; | |
1398 | } | |
1399 | return 0; | |
1400 | } | |
1401 | #endif | |
1402 | ||
1403 | static int cbq_set_fopt(struct cbq_class *cl, struct tc_cbq_fopt *fopt) | |
1404 | { | |
1405 | cbq_change_defmap(cl, fopt->split, fopt->defmap, fopt->defchange); | |
1406 | return 0; | |
1407 | } | |
1408 | ||
1409 | static int cbq_init(struct Qdisc *sch, struct rtattr *opt) | |
1410 | { | |
1411 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1412 | struct rtattr *tb[TCA_CBQ_MAX]; | |
1413 | struct tc_ratespec *r; | |
1414 | ||
1415 | if (rtattr_parse_nested(tb, TCA_CBQ_MAX, opt) < 0 || | |
1416 | tb[TCA_CBQ_RTAB-1] == NULL || tb[TCA_CBQ_RATE-1] == NULL || | |
1417 | RTA_PAYLOAD(tb[TCA_CBQ_RATE-1]) < sizeof(struct tc_ratespec)) | |
1418 | return -EINVAL; | |
1419 | ||
1420 | if (tb[TCA_CBQ_LSSOPT-1] && | |
1421 | RTA_PAYLOAD(tb[TCA_CBQ_LSSOPT-1]) < sizeof(struct tc_cbq_lssopt)) | |
1422 | return -EINVAL; | |
1423 | ||
1424 | r = RTA_DATA(tb[TCA_CBQ_RATE-1]); | |
1425 | ||
1426 | if ((q->link.R_tab = qdisc_get_rtab(r, tb[TCA_CBQ_RTAB-1])) == NULL) | |
1427 | return -EINVAL; | |
1428 | ||
1429 | q->link.refcnt = 1; | |
1430 | q->link.sibling = &q->link; | |
1431 | q->link.classid = sch->handle; | |
1432 | q->link.qdisc = sch; | |
1433 | if (!(q->link.q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops))) | |
1434 | q->link.q = &noop_qdisc; | |
1435 | ||
1436 | q->link.priority = TC_CBQ_MAXPRIO-1; | |
1437 | q->link.priority2 = TC_CBQ_MAXPRIO-1; | |
1438 | q->link.cpriority = TC_CBQ_MAXPRIO-1; | |
1439 | q->link.ovl_strategy = TC_CBQ_OVL_CLASSIC; | |
1440 | q->link.overlimit = cbq_ovl_classic; | |
1441 | q->link.allot = psched_mtu(sch->dev); | |
1442 | q->link.quantum = q->link.allot; | |
1443 | q->link.weight = q->link.R_tab->rate.rate; | |
1444 | ||
1445 | q->link.ewma_log = TC_CBQ_DEF_EWMA; | |
1446 | q->link.avpkt = q->link.allot/2; | |
1447 | q->link.minidle = -0x7FFFFFFF; | |
1448 | q->link.stats_lock = &sch->dev->queue_lock; | |
1449 | ||
1450 | init_timer(&q->wd_timer); | |
1451 | q->wd_timer.data = (unsigned long)sch; | |
1452 | q->wd_timer.function = cbq_watchdog; | |
1453 | init_timer(&q->delay_timer); | |
1454 | q->delay_timer.data = (unsigned long)sch; | |
1455 | q->delay_timer.function = cbq_undelay; | |
1456 | q->toplevel = TC_CBQ_MAXLEVEL; | |
1457 | PSCHED_GET_TIME(q->now); | |
1458 | q->now_rt = q->now; | |
1459 | ||
1460 | cbq_link_class(&q->link); | |
1461 | ||
1462 | if (tb[TCA_CBQ_LSSOPT-1]) | |
1463 | cbq_set_lss(&q->link, RTA_DATA(tb[TCA_CBQ_LSSOPT-1])); | |
1464 | ||
1465 | cbq_addprio(q, &q->link); | |
1466 | return 0; | |
1467 | } | |
1468 | ||
1469 | static __inline__ int cbq_dump_rate(struct sk_buff *skb, struct cbq_class *cl) | |
1470 | { | |
1471 | unsigned char *b = skb->tail; | |
1472 | ||
1473 | RTA_PUT(skb, TCA_CBQ_RATE, sizeof(cl->R_tab->rate), &cl->R_tab->rate); | |
1474 | return skb->len; | |
1475 | ||
1476 | rtattr_failure: | |
1477 | skb_trim(skb, b - skb->data); | |
1478 | return -1; | |
1479 | } | |
1480 | ||
1481 | static __inline__ int cbq_dump_lss(struct sk_buff *skb, struct cbq_class *cl) | |
1482 | { | |
1483 | unsigned char *b = skb->tail; | |
1484 | struct tc_cbq_lssopt opt; | |
1485 | ||
1486 | opt.flags = 0; | |
1487 | if (cl->borrow == NULL) | |
1488 | opt.flags |= TCF_CBQ_LSS_BOUNDED; | |
1489 | if (cl->share == NULL) | |
1490 | opt.flags |= TCF_CBQ_LSS_ISOLATED; | |
1491 | opt.ewma_log = cl->ewma_log; | |
1492 | opt.level = cl->level; | |
1493 | opt.avpkt = cl->avpkt; | |
1494 | opt.maxidle = cl->maxidle; | |
1495 | opt.minidle = (u32)(-cl->minidle); | |
1496 | opt.offtime = cl->offtime; | |
1497 | opt.change = ~0; | |
1498 | RTA_PUT(skb, TCA_CBQ_LSSOPT, sizeof(opt), &opt); | |
1499 | return skb->len; | |
1500 | ||
1501 | rtattr_failure: | |
1502 | skb_trim(skb, b - skb->data); | |
1503 | return -1; | |
1504 | } | |
1505 | ||
1506 | static __inline__ int cbq_dump_wrr(struct sk_buff *skb, struct cbq_class *cl) | |
1507 | { | |
1508 | unsigned char *b = skb->tail; | |
1509 | struct tc_cbq_wrropt opt; | |
1510 | ||
1511 | opt.flags = 0; | |
1512 | opt.allot = cl->allot; | |
1513 | opt.priority = cl->priority+1; | |
1514 | opt.cpriority = cl->cpriority+1; | |
1515 | opt.weight = cl->weight; | |
1516 | RTA_PUT(skb, TCA_CBQ_WRROPT, sizeof(opt), &opt); | |
1517 | return skb->len; | |
1518 | ||
1519 | rtattr_failure: | |
1520 | skb_trim(skb, b - skb->data); | |
1521 | return -1; | |
1522 | } | |
1523 | ||
1524 | static __inline__ int cbq_dump_ovl(struct sk_buff *skb, struct cbq_class *cl) | |
1525 | { | |
1526 | unsigned char *b = skb->tail; | |
1527 | struct tc_cbq_ovl opt; | |
1528 | ||
1529 | opt.strategy = cl->ovl_strategy; | |
1530 | opt.priority2 = cl->priority2+1; | |
1531 | opt.penalty = (cl->penalty*1000)/HZ; | |
1532 | RTA_PUT(skb, TCA_CBQ_OVL_STRATEGY, sizeof(opt), &opt); | |
1533 | return skb->len; | |
1534 | ||
1535 | rtattr_failure: | |
1536 | skb_trim(skb, b - skb->data); | |
1537 | return -1; | |
1538 | } | |
1539 | ||
1540 | static __inline__ int cbq_dump_fopt(struct sk_buff *skb, struct cbq_class *cl) | |
1541 | { | |
1542 | unsigned char *b = skb->tail; | |
1543 | struct tc_cbq_fopt opt; | |
1544 | ||
1545 | if (cl->split || cl->defmap) { | |
1546 | opt.split = cl->split ? cl->split->classid : 0; | |
1547 | opt.defmap = cl->defmap; | |
1548 | opt.defchange = ~0; | |
1549 | RTA_PUT(skb, TCA_CBQ_FOPT, sizeof(opt), &opt); | |
1550 | } | |
1551 | return skb->len; | |
1552 | ||
1553 | rtattr_failure: | |
1554 | skb_trim(skb, b - skb->data); | |
1555 | return -1; | |
1556 | } | |
1557 | ||
1558 | #ifdef CONFIG_NET_CLS_POLICE | |
1559 | static __inline__ int cbq_dump_police(struct sk_buff *skb, struct cbq_class *cl) | |
1560 | { | |
1561 | unsigned char *b = skb->tail; | |
1562 | struct tc_cbq_police opt; | |
1563 | ||
1564 | if (cl->police) { | |
1565 | opt.police = cl->police; | |
1566 | RTA_PUT(skb, TCA_CBQ_POLICE, sizeof(opt), &opt); | |
1567 | } | |
1568 | return skb->len; | |
1569 | ||
1570 | rtattr_failure: | |
1571 | skb_trim(skb, b - skb->data); | |
1572 | return -1; | |
1573 | } | |
1574 | #endif | |
1575 | ||
1576 | static int cbq_dump_attr(struct sk_buff *skb, struct cbq_class *cl) | |
1577 | { | |
1578 | if (cbq_dump_lss(skb, cl) < 0 || | |
1579 | cbq_dump_rate(skb, cl) < 0 || | |
1580 | cbq_dump_wrr(skb, cl) < 0 || | |
1581 | cbq_dump_ovl(skb, cl) < 0 || | |
1582 | #ifdef CONFIG_NET_CLS_POLICE | |
1583 | cbq_dump_police(skb, cl) < 0 || | |
1584 | #endif | |
1585 | cbq_dump_fopt(skb, cl) < 0) | |
1586 | return -1; | |
1587 | return 0; | |
1588 | } | |
1589 | ||
1590 | static int cbq_dump(struct Qdisc *sch, struct sk_buff *skb) | |
1591 | { | |
1592 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1593 | unsigned char *b = skb->tail; | |
1594 | struct rtattr *rta; | |
1595 | ||
1596 | rta = (struct rtattr*)b; | |
1597 | RTA_PUT(skb, TCA_OPTIONS, 0, NULL); | |
1598 | if (cbq_dump_attr(skb, &q->link) < 0) | |
1599 | goto rtattr_failure; | |
1600 | rta->rta_len = skb->tail - b; | |
1601 | return skb->len; | |
1602 | ||
1603 | rtattr_failure: | |
1604 | skb_trim(skb, b - skb->data); | |
1605 | return -1; | |
1606 | } | |
1607 | ||
1608 | static int | |
1609 | cbq_dump_stats(struct Qdisc *sch, struct gnet_dump *d) | |
1610 | { | |
1611 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1612 | ||
1613 | q->link.xstats.avgidle = q->link.avgidle; | |
1614 | return gnet_stats_copy_app(d, &q->link.xstats, sizeof(q->link.xstats)); | |
1615 | } | |
1616 | ||
1617 | static int | |
1618 | cbq_dump_class(struct Qdisc *sch, unsigned long arg, | |
1619 | struct sk_buff *skb, struct tcmsg *tcm) | |
1620 | { | |
1621 | struct cbq_class *cl = (struct cbq_class*)arg; | |
1622 | unsigned char *b = skb->tail; | |
1623 | struct rtattr *rta; | |
1624 | ||
1625 | if (cl->tparent) | |
1626 | tcm->tcm_parent = cl->tparent->classid; | |
1627 | else | |
1628 | tcm->tcm_parent = TC_H_ROOT; | |
1629 | tcm->tcm_handle = cl->classid; | |
1630 | tcm->tcm_info = cl->q->handle; | |
1631 | ||
1632 | rta = (struct rtattr*)b; | |
1633 | RTA_PUT(skb, TCA_OPTIONS, 0, NULL); | |
1634 | if (cbq_dump_attr(skb, cl) < 0) | |
1635 | goto rtattr_failure; | |
1636 | rta->rta_len = skb->tail - b; | |
1637 | return skb->len; | |
1638 | ||
1639 | rtattr_failure: | |
1640 | skb_trim(skb, b - skb->data); | |
1641 | return -1; | |
1642 | } | |
1643 | ||
1644 | static int | |
1645 | cbq_dump_class_stats(struct Qdisc *sch, unsigned long arg, | |
1646 | struct gnet_dump *d) | |
1647 | { | |
1648 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1649 | struct cbq_class *cl = (struct cbq_class*)arg; | |
1650 | ||
1651 | cl->qstats.qlen = cl->q->q.qlen; | |
1652 | cl->xstats.avgidle = cl->avgidle; | |
1653 | cl->xstats.undertime = 0; | |
1654 | ||
1655 | if (!PSCHED_IS_PASTPERFECT(cl->undertime)) | |
1656 | cl->xstats.undertime = PSCHED_TDIFF(cl->undertime, q->now); | |
1657 | ||
1658 | if (gnet_stats_copy_basic(d, &cl->bstats) < 0 || | |
1659 | #ifdef CONFIG_NET_ESTIMATOR | |
1660 | gnet_stats_copy_rate_est(d, &cl->rate_est) < 0 || | |
1661 | #endif | |
1662 | gnet_stats_copy_queue(d, &cl->qstats) < 0) | |
1663 | return -1; | |
1664 | ||
1665 | return gnet_stats_copy_app(d, &cl->xstats, sizeof(cl->xstats)); | |
1666 | } | |
1667 | ||
1668 | static int cbq_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new, | |
1669 | struct Qdisc **old) | |
1670 | { | |
1671 | struct cbq_class *cl = (struct cbq_class*)arg; | |
1672 | ||
1673 | if (cl) { | |
1674 | if (new == NULL) { | |
1675 | if ((new = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops)) == NULL) | |
1676 | return -ENOBUFS; | |
1677 | } else { | |
1678 | #ifdef CONFIG_NET_CLS_POLICE | |
1679 | if (cl->police == TC_POLICE_RECLASSIFY) | |
1680 | new->reshape_fail = cbq_reshape_fail; | |
1681 | #endif | |
1682 | } | |
1683 | sch_tree_lock(sch); | |
1684 | *old = cl->q; | |
1685 | cl->q = new; | |
1686 | sch->q.qlen -= (*old)->q.qlen; | |
1687 | qdisc_reset(*old); | |
1688 | sch_tree_unlock(sch); | |
1689 | ||
1690 | return 0; | |
1691 | } | |
1692 | return -ENOENT; | |
1693 | } | |
1694 | ||
1695 | static struct Qdisc * | |
1696 | cbq_leaf(struct Qdisc *sch, unsigned long arg) | |
1697 | { | |
1698 | struct cbq_class *cl = (struct cbq_class*)arg; | |
1699 | ||
1700 | return cl ? cl->q : NULL; | |
1701 | } | |
1702 | ||
1703 | static unsigned long cbq_get(struct Qdisc *sch, u32 classid) | |
1704 | { | |
1705 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1706 | struct cbq_class *cl = cbq_class_lookup(q, classid); | |
1707 | ||
1708 | if (cl) { | |
1709 | cl->refcnt++; | |
1710 | return (unsigned long)cl; | |
1711 | } | |
1712 | return 0; | |
1713 | } | |
1714 | ||
1715 | static void cbq_destroy_filters(struct cbq_class *cl) | |
1716 | { | |
1717 | struct tcf_proto *tp; | |
1718 | ||
1719 | while ((tp = cl->filter_list) != NULL) { | |
1720 | cl->filter_list = tp->next; | |
1721 | tcf_destroy(tp); | |
1722 | } | |
1723 | } | |
1724 | ||
1725 | static void cbq_destroy_class(struct Qdisc *sch, struct cbq_class *cl) | |
1726 | { | |
1727 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1728 | ||
1729 | BUG_TRAP(!cl->filters); | |
1730 | ||
1731 | cbq_destroy_filters(cl); | |
1732 | qdisc_destroy(cl->q); | |
1733 | qdisc_put_rtab(cl->R_tab); | |
1734 | #ifdef CONFIG_NET_ESTIMATOR | |
1735 | gen_kill_estimator(&cl->bstats, &cl->rate_est); | |
1736 | #endif | |
1737 | if (cl != &q->link) | |
1738 | kfree(cl); | |
1739 | } | |
1740 | ||
1741 | static void | |
1742 | cbq_destroy(struct Qdisc* sch) | |
1743 | { | |
1744 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1745 | struct cbq_class *cl; | |
1746 | unsigned h; | |
1747 | ||
1748 | #ifdef CONFIG_NET_CLS_POLICE | |
1749 | q->rx_class = NULL; | |
1750 | #endif | |
1751 | /* | |
1752 | * Filters must be destroyed first because we don't destroy the | |
1753 | * classes from root to leafs which means that filters can still | |
1754 | * be bound to classes which have been destroyed already. --TGR '04 | |
1755 | */ | |
1756 | for (h = 0; h < 16; h++) | |
1757 | for (cl = q->classes[h]; cl; cl = cl->next) | |
1758 | cbq_destroy_filters(cl); | |
1759 | ||
1760 | for (h = 0; h < 16; h++) { | |
1761 | struct cbq_class *next; | |
1762 | ||
1763 | for (cl = q->classes[h]; cl; cl = next) { | |
1764 | next = cl->next; | |
1765 | cbq_destroy_class(sch, cl); | |
1766 | } | |
1767 | } | |
1768 | } | |
1769 | ||
1770 | static void cbq_put(struct Qdisc *sch, unsigned long arg) | |
1771 | { | |
1772 | struct cbq_class *cl = (struct cbq_class*)arg; | |
1773 | ||
1774 | if (--cl->refcnt == 0) { | |
1775 | #ifdef CONFIG_NET_CLS_POLICE | |
1776 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1777 | ||
1778 | spin_lock_bh(&sch->dev->queue_lock); | |
1779 | if (q->rx_class == cl) | |
1780 | q->rx_class = NULL; | |
1781 | spin_unlock_bh(&sch->dev->queue_lock); | |
1782 | #endif | |
1783 | ||
1784 | cbq_destroy_class(sch, cl); | |
1785 | } | |
1786 | } | |
1787 | ||
1788 | static int | |
1789 | cbq_change_class(struct Qdisc *sch, u32 classid, u32 parentid, struct rtattr **tca, | |
1790 | unsigned long *arg) | |
1791 | { | |
1792 | int err; | |
1793 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1794 | struct cbq_class *cl = (struct cbq_class*)*arg; | |
1795 | struct rtattr *opt = tca[TCA_OPTIONS-1]; | |
1796 | struct rtattr *tb[TCA_CBQ_MAX]; | |
1797 | struct cbq_class *parent; | |
1798 | struct qdisc_rate_table *rtab = NULL; | |
1799 | ||
1800 | if (opt==NULL || rtattr_parse_nested(tb, TCA_CBQ_MAX, opt)) | |
1801 | return -EINVAL; | |
1802 | ||
1803 | if (tb[TCA_CBQ_OVL_STRATEGY-1] && | |
1804 | RTA_PAYLOAD(tb[TCA_CBQ_OVL_STRATEGY-1]) < sizeof(struct tc_cbq_ovl)) | |
1805 | return -EINVAL; | |
1806 | ||
1807 | if (tb[TCA_CBQ_FOPT-1] && | |
1808 | RTA_PAYLOAD(tb[TCA_CBQ_FOPT-1]) < sizeof(struct tc_cbq_fopt)) | |
1809 | return -EINVAL; | |
1810 | ||
1811 | if (tb[TCA_CBQ_RATE-1] && | |
1812 | RTA_PAYLOAD(tb[TCA_CBQ_RATE-1]) < sizeof(struct tc_ratespec)) | |
1813 | return -EINVAL; | |
1814 | ||
1815 | if (tb[TCA_CBQ_LSSOPT-1] && | |
1816 | RTA_PAYLOAD(tb[TCA_CBQ_LSSOPT-1]) < sizeof(struct tc_cbq_lssopt)) | |
1817 | return -EINVAL; | |
1818 | ||
1819 | if (tb[TCA_CBQ_WRROPT-1] && | |
1820 | RTA_PAYLOAD(tb[TCA_CBQ_WRROPT-1]) < sizeof(struct tc_cbq_wrropt)) | |
1821 | return -EINVAL; | |
1822 | ||
1823 | #ifdef CONFIG_NET_CLS_POLICE | |
1824 | if (tb[TCA_CBQ_POLICE-1] && | |
1825 | RTA_PAYLOAD(tb[TCA_CBQ_POLICE-1]) < sizeof(struct tc_cbq_police)) | |
1826 | return -EINVAL; | |
1827 | #endif | |
1828 | ||
1829 | if (cl) { | |
1830 | /* Check parent */ | |
1831 | if (parentid) { | |
1832 | if (cl->tparent && cl->tparent->classid != parentid) | |
1833 | return -EINVAL; | |
1834 | if (!cl->tparent && parentid != TC_H_ROOT) | |
1835 | return -EINVAL; | |
1836 | } | |
1837 | ||
1838 | if (tb[TCA_CBQ_RATE-1]) { | |
1839 | rtab = qdisc_get_rtab(RTA_DATA(tb[TCA_CBQ_RATE-1]), tb[TCA_CBQ_RTAB-1]); | |
1840 | if (rtab == NULL) | |
1841 | return -EINVAL; | |
1842 | } | |
1843 | ||
1844 | /* Change class parameters */ | |
1845 | sch_tree_lock(sch); | |
1846 | ||
1847 | if (cl->next_alive != NULL) | |
1848 | cbq_deactivate_class(cl); | |
1849 | ||
1850 | if (rtab) { | |
1851 | rtab = xchg(&cl->R_tab, rtab); | |
1852 | qdisc_put_rtab(rtab); | |
1853 | } | |
1854 | ||
1855 | if (tb[TCA_CBQ_LSSOPT-1]) | |
1856 | cbq_set_lss(cl, RTA_DATA(tb[TCA_CBQ_LSSOPT-1])); | |
1857 | ||
1858 | if (tb[TCA_CBQ_WRROPT-1]) { | |
1859 | cbq_rmprio(q, cl); | |
1860 | cbq_set_wrr(cl, RTA_DATA(tb[TCA_CBQ_WRROPT-1])); | |
1861 | } | |
1862 | ||
1863 | if (tb[TCA_CBQ_OVL_STRATEGY-1]) | |
1864 | cbq_set_overlimit(cl, RTA_DATA(tb[TCA_CBQ_OVL_STRATEGY-1])); | |
1865 | ||
1866 | #ifdef CONFIG_NET_CLS_POLICE | |
1867 | if (tb[TCA_CBQ_POLICE-1]) | |
1868 | cbq_set_police(cl, RTA_DATA(tb[TCA_CBQ_POLICE-1])); | |
1869 | #endif | |
1870 | ||
1871 | if (tb[TCA_CBQ_FOPT-1]) | |
1872 | cbq_set_fopt(cl, RTA_DATA(tb[TCA_CBQ_FOPT-1])); | |
1873 | ||
1874 | if (cl->q->q.qlen) | |
1875 | cbq_activate_class(cl); | |
1876 | ||
1877 | sch_tree_unlock(sch); | |
1878 | ||
1879 | #ifdef CONFIG_NET_ESTIMATOR | |
1880 | if (tca[TCA_RATE-1]) | |
1881 | gen_replace_estimator(&cl->bstats, &cl->rate_est, | |
1882 | cl->stats_lock, tca[TCA_RATE-1]); | |
1883 | #endif | |
1884 | return 0; | |
1885 | } | |
1886 | ||
1887 | if (parentid == TC_H_ROOT) | |
1888 | return -EINVAL; | |
1889 | ||
1890 | if (tb[TCA_CBQ_WRROPT-1] == NULL || tb[TCA_CBQ_RATE-1] == NULL || | |
1891 | tb[TCA_CBQ_LSSOPT-1] == NULL) | |
1892 | return -EINVAL; | |
1893 | ||
1894 | rtab = qdisc_get_rtab(RTA_DATA(tb[TCA_CBQ_RATE-1]), tb[TCA_CBQ_RTAB-1]); | |
1895 | if (rtab == NULL) | |
1896 | return -EINVAL; | |
1897 | ||
1898 | if (classid) { | |
1899 | err = -EINVAL; | |
1900 | if (TC_H_MAJ(classid^sch->handle) || cbq_class_lookup(q, classid)) | |
1901 | goto failure; | |
1902 | } else { | |
1903 | int i; | |
1904 | classid = TC_H_MAKE(sch->handle,0x8000); | |
1905 | ||
1906 | for (i=0; i<0x8000; i++) { | |
1907 | if (++q->hgenerator >= 0x8000) | |
1908 | q->hgenerator = 1; | |
1909 | if (cbq_class_lookup(q, classid|q->hgenerator) == NULL) | |
1910 | break; | |
1911 | } | |
1912 | err = -ENOSR; | |
1913 | if (i >= 0x8000) | |
1914 | goto failure; | |
1915 | classid = classid|q->hgenerator; | |
1916 | } | |
1917 | ||
1918 | parent = &q->link; | |
1919 | if (parentid) { | |
1920 | parent = cbq_class_lookup(q, parentid); | |
1921 | err = -EINVAL; | |
1922 | if (parent == NULL) | |
1923 | goto failure; | |
1924 | } | |
1925 | ||
1926 | err = -ENOBUFS; | |
1927 | cl = kmalloc(sizeof(*cl), GFP_KERNEL); | |
1928 | if (cl == NULL) | |
1929 | goto failure; | |
1930 | memset(cl, 0, sizeof(*cl)); | |
1931 | cl->R_tab = rtab; | |
1932 | rtab = NULL; | |
1933 | cl->refcnt = 1; | |
1934 | if (!(cl->q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops))) | |
1935 | cl->q = &noop_qdisc; | |
1936 | cl->classid = classid; | |
1937 | cl->tparent = parent; | |
1938 | cl->qdisc = sch; | |
1939 | cl->allot = parent->allot; | |
1940 | cl->quantum = cl->allot; | |
1941 | cl->weight = cl->R_tab->rate.rate; | |
1942 | cl->stats_lock = &sch->dev->queue_lock; | |
1943 | ||
1944 | sch_tree_lock(sch); | |
1945 | cbq_link_class(cl); | |
1946 | cl->borrow = cl->tparent; | |
1947 | if (cl->tparent != &q->link) | |
1948 | cl->share = cl->tparent; | |
1949 | cbq_adjust_levels(parent); | |
1950 | cl->minidle = -0x7FFFFFFF; | |
1951 | cbq_set_lss(cl, RTA_DATA(tb[TCA_CBQ_LSSOPT-1])); | |
1952 | cbq_set_wrr(cl, RTA_DATA(tb[TCA_CBQ_WRROPT-1])); | |
1953 | if (cl->ewma_log==0) | |
1954 | cl->ewma_log = q->link.ewma_log; | |
1955 | if (cl->maxidle==0) | |
1956 | cl->maxidle = q->link.maxidle; | |
1957 | if (cl->avpkt==0) | |
1958 | cl->avpkt = q->link.avpkt; | |
1959 | cl->overlimit = cbq_ovl_classic; | |
1960 | if (tb[TCA_CBQ_OVL_STRATEGY-1]) | |
1961 | cbq_set_overlimit(cl, RTA_DATA(tb[TCA_CBQ_OVL_STRATEGY-1])); | |
1962 | #ifdef CONFIG_NET_CLS_POLICE | |
1963 | if (tb[TCA_CBQ_POLICE-1]) | |
1964 | cbq_set_police(cl, RTA_DATA(tb[TCA_CBQ_POLICE-1])); | |
1965 | #endif | |
1966 | if (tb[TCA_CBQ_FOPT-1]) | |
1967 | cbq_set_fopt(cl, RTA_DATA(tb[TCA_CBQ_FOPT-1])); | |
1968 | sch_tree_unlock(sch); | |
1969 | ||
1970 | #ifdef CONFIG_NET_ESTIMATOR | |
1971 | if (tca[TCA_RATE-1]) | |
1972 | gen_new_estimator(&cl->bstats, &cl->rate_est, | |
1973 | cl->stats_lock, tca[TCA_RATE-1]); | |
1974 | #endif | |
1975 | ||
1976 | *arg = (unsigned long)cl; | |
1977 | return 0; | |
1978 | ||
1979 | failure: | |
1980 | qdisc_put_rtab(rtab); | |
1981 | return err; | |
1982 | } | |
1983 | ||
1984 | static int cbq_delete(struct Qdisc *sch, unsigned long arg) | |
1985 | { | |
1986 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1987 | struct cbq_class *cl = (struct cbq_class*)arg; | |
1988 | ||
1989 | if (cl->filters || cl->children || cl == &q->link) | |
1990 | return -EBUSY; | |
1991 | ||
1992 | sch_tree_lock(sch); | |
1993 | ||
1994 | if (cl->next_alive) | |
1995 | cbq_deactivate_class(cl); | |
1996 | ||
1997 | if (q->tx_borrowed == cl) | |
1998 | q->tx_borrowed = q->tx_class; | |
1999 | if (q->tx_class == cl) { | |
2000 | q->tx_class = NULL; | |
2001 | q->tx_borrowed = NULL; | |
2002 | } | |
2003 | #ifdef CONFIG_NET_CLS_POLICE | |
2004 | if (q->rx_class == cl) | |
2005 | q->rx_class = NULL; | |
2006 | #endif | |
2007 | ||
2008 | cbq_unlink_class(cl); | |
2009 | cbq_adjust_levels(cl->tparent); | |
2010 | cl->defmap = 0; | |
2011 | cbq_sync_defmap(cl); | |
2012 | ||
2013 | cbq_rmprio(q, cl); | |
2014 | sch_tree_unlock(sch); | |
2015 | ||
2016 | if (--cl->refcnt == 0) | |
2017 | cbq_destroy_class(sch, cl); | |
2018 | ||
2019 | return 0; | |
2020 | } | |
2021 | ||
2022 | static struct tcf_proto **cbq_find_tcf(struct Qdisc *sch, unsigned long arg) | |
2023 | { | |
2024 | struct cbq_sched_data *q = qdisc_priv(sch); | |
2025 | struct cbq_class *cl = (struct cbq_class *)arg; | |
2026 | ||
2027 | if (cl == NULL) | |
2028 | cl = &q->link; | |
2029 | ||
2030 | return &cl->filter_list; | |
2031 | } | |
2032 | ||
2033 | static unsigned long cbq_bind_filter(struct Qdisc *sch, unsigned long parent, | |
2034 | u32 classid) | |
2035 | { | |
2036 | struct cbq_sched_data *q = qdisc_priv(sch); | |
2037 | struct cbq_class *p = (struct cbq_class*)parent; | |
2038 | struct cbq_class *cl = cbq_class_lookup(q, classid); | |
2039 | ||
2040 | if (cl) { | |
2041 | if (p && p->level <= cl->level) | |
2042 | return 0; | |
2043 | cl->filters++; | |
2044 | return (unsigned long)cl; | |
2045 | } | |
2046 | return 0; | |
2047 | } | |
2048 | ||
2049 | static void cbq_unbind_filter(struct Qdisc *sch, unsigned long arg) | |
2050 | { | |
2051 | struct cbq_class *cl = (struct cbq_class*)arg; | |
2052 | ||
2053 | cl->filters--; | |
2054 | } | |
2055 | ||
2056 | static void cbq_walk(struct Qdisc *sch, struct qdisc_walker *arg) | |
2057 | { | |
2058 | struct cbq_sched_data *q = qdisc_priv(sch); | |
2059 | unsigned h; | |
2060 | ||
2061 | if (arg->stop) | |
2062 | return; | |
2063 | ||
2064 | for (h = 0; h < 16; h++) { | |
2065 | struct cbq_class *cl; | |
2066 | ||
2067 | for (cl = q->classes[h]; cl; cl = cl->next) { | |
2068 | if (arg->count < arg->skip) { | |
2069 | arg->count++; | |
2070 | continue; | |
2071 | } | |
2072 | if (arg->fn(sch, (unsigned long)cl, arg) < 0) { | |
2073 | arg->stop = 1; | |
2074 | return; | |
2075 | } | |
2076 | arg->count++; | |
2077 | } | |
2078 | } | |
2079 | } | |
2080 | ||
2081 | static struct Qdisc_class_ops cbq_class_ops = { | |
2082 | .graft = cbq_graft, | |
2083 | .leaf = cbq_leaf, | |
2084 | .get = cbq_get, | |
2085 | .put = cbq_put, | |
2086 | .change = cbq_change_class, | |
2087 | .delete = cbq_delete, | |
2088 | .walk = cbq_walk, | |
2089 | .tcf_chain = cbq_find_tcf, | |
2090 | .bind_tcf = cbq_bind_filter, | |
2091 | .unbind_tcf = cbq_unbind_filter, | |
2092 | .dump = cbq_dump_class, | |
2093 | .dump_stats = cbq_dump_class_stats, | |
2094 | }; | |
2095 | ||
2096 | static struct Qdisc_ops cbq_qdisc_ops = { | |
2097 | .next = NULL, | |
2098 | .cl_ops = &cbq_class_ops, | |
2099 | .id = "cbq", | |
2100 | .priv_size = sizeof(struct cbq_sched_data), | |
2101 | .enqueue = cbq_enqueue, | |
2102 | .dequeue = cbq_dequeue, | |
2103 | .requeue = cbq_requeue, | |
2104 | .drop = cbq_drop, | |
2105 | .init = cbq_init, | |
2106 | .reset = cbq_reset, | |
2107 | .destroy = cbq_destroy, | |
2108 | .change = NULL, | |
2109 | .dump = cbq_dump, | |
2110 | .dump_stats = cbq_dump_stats, | |
2111 | .owner = THIS_MODULE, | |
2112 | }; | |
2113 | ||
2114 | static int __init cbq_module_init(void) | |
2115 | { | |
2116 | return register_qdisc(&cbq_qdisc_ops); | |
2117 | } | |
2118 | static void __exit cbq_module_exit(void) | |
2119 | { | |
2120 | unregister_qdisc(&cbq_qdisc_ops); | |
2121 | } | |
2122 | module_init(cbq_module_init) | |
2123 | module_exit(cbq_module_exit) | |
2124 | MODULE_LICENSE("GPL"); |