]>
Commit | Line | Data |
---|---|---|
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 LT |
13 | #include <linux/module.h> |
14 | #include <asm/uaccess.h> | |
15 | #include <asm/system.h> | |
16 | #include <linux/bitops.h> | |
17 | #include <linux/types.h> | |
18 | #include <linux/kernel.h> | |
1da177e4 LT |
19 | #include <linux/string.h> |
20 | #include <linux/mm.h> | |
21 | #include <linux/socket.h> | |
22 | #include <linux/sockios.h> | |
23 | #include <linux/in.h> | |
24 | #include <linux/errno.h> | |
25 | #include <linux/interrupt.h> | |
26 | #include <linux/if_ether.h> | |
27 | #include <linux/inet.h> | |
28 | #include <linux/netdevice.h> | |
29 | #include <linux/etherdevice.h> | |
30 | #include <linux/notifier.h> | |
31 | #include <net/ip.h> | |
32 | #include <net/route.h> | |
33 | #include <linux/skbuff.h> | |
34 | #include <net/sock.h> | |
35 | #include <net/pkt_sched.h> | |
36 | ||
37 | ||
38 | /* Class-Based Queueing (CBQ) algorithm. | |
39 | ======================================= | |
40 | ||
41 | Sources: [1] Sally Floyd and Van Jacobson, "Link-sharing and Resource | |
10297b99 | 42 | Management Models for Packet Networks", |
1da177e4 LT |
43 | IEEE/ACM Transactions on Networking, Vol.3, No.4, 1995 |
44 | ||
10297b99 | 45 | [2] Sally Floyd, "Notes on CBQ and Guaranteed Service", 1995 |
1da177e4 | 46 | |
10297b99 | 47 | [3] Sally Floyd, "Notes on Class-Based Queueing: Setting |
1da177e4 LT |
48 | Parameters", 1996 |
49 | ||
50 | [4] Sally Floyd and Michael Speer, "Experimental Results | |
51 | for Class-Based Queueing", 1998, not published. | |
52 | ||
53 | ----------------------------------------------------------------------- | |
54 | ||
55 | Algorithm skeleton was taken from NS simulator cbq.cc. | |
56 | If someone wants to check this code against the LBL version, | |
57 | he should take into account that ONLY the skeleton was borrowed, | |
58 | the implementation is different. Particularly: | |
59 | ||
60 | --- The WRR algorithm is different. Our version looks more | |
10297b99 YH |
61 | reasonable (I hope) and works when quanta are allowed to be |
62 | less than MTU, which is always the case when real time classes | |
63 | have small rates. Note, that the statement of [3] is | |
64 | incomplete, delay may actually be estimated even if class | |
65 | per-round allotment is less than MTU. Namely, if per-round | |
66 | allotment is W*r_i, and r_1+...+r_k = r < 1 | |
1da177e4 LT |
67 | |
68 | delay_i <= ([MTU/(W*r_i)]*W*r + W*r + k*MTU)/B | |
69 | ||
70 | In the worst case we have IntServ estimate with D = W*r+k*MTU | |
71 | and C = MTU*r. The proof (if correct at all) is trivial. | |
72 | ||
73 | ||
74 | --- It seems that cbq-2.0 is not very accurate. At least, I cannot | |
75 | interpret some places, which look like wrong translations | |
76 | from NS. Anyone is advised to find these differences | |
77 | and explain to me, why I am wrong 8). | |
78 | ||
79 | --- Linux has no EOI event, so that we cannot estimate true class | |
80 | idle time. Workaround is to consider the next dequeue event | |
81 | as sign that previous packet is finished. This is wrong because of | |
82 | internal device queueing, but on a permanently loaded link it is true. | |
83 | Moreover, combined with clock integrator, this scheme looks | |
84 | very close to an ideal solution. */ | |
85 | ||
86 | struct cbq_sched_data; | |
87 | ||
88 | ||
89 | struct cbq_class | |
90 | { | |
91 | struct cbq_class *next; /* hash table link */ | |
92 | struct cbq_class *next_alive; /* next class with backlog in this priority band */ | |
93 | ||
94 | /* Parameters */ | |
95 | u32 classid; | |
96 | unsigned char priority; /* class priority */ | |
97 | unsigned char priority2; /* priority to be used after overlimit */ | |
98 | unsigned char ewma_log; /* time constant for idle time calculation */ | |
99 | unsigned char ovl_strategy; | |
100 | #ifdef CONFIG_NET_CLS_POLICE | |
101 | unsigned char police; | |
102 | #endif | |
103 | ||
104 | u32 defmap; | |
105 | ||
106 | /* Link-sharing scheduler parameters */ | |
107 | long maxidle; /* Class parameters: see below. */ | |
108 | long offtime; | |
109 | long minidle; | |
110 | u32 avpkt; | |
111 | struct qdisc_rate_table *R_tab; | |
112 | ||
113 | /* Overlimit strategy parameters */ | |
114 | void (*overlimit)(struct cbq_class *cl); | |
1a13cb63 | 115 | psched_tdiff_t penalty; |
1da177e4 LT |
116 | |
117 | /* General scheduler (WRR) parameters */ | |
118 | long allot; | |
119 | long quantum; /* Allotment per WRR round */ | |
120 | long weight; /* Relative allotment: see below */ | |
121 | ||
122 | struct Qdisc *qdisc; /* Ptr to CBQ discipline */ | |
123 | struct cbq_class *split; /* Ptr to split node */ | |
124 | struct cbq_class *share; /* Ptr to LS parent in the class tree */ | |
125 | struct cbq_class *tparent; /* Ptr to tree parent in the class tree */ | |
126 | struct cbq_class *borrow; /* NULL if class is bandwidth limited; | |
127 | parent otherwise */ | |
128 | struct cbq_class *sibling; /* Sibling chain */ | |
129 | struct cbq_class *children; /* Pointer to children chain */ | |
130 | ||
131 | struct Qdisc *q; /* Elementary queueing discipline */ | |
132 | ||
133 | ||
134 | /* Variables */ | |
135 | unsigned char cpriority; /* Effective priority */ | |
136 | unsigned char delayed; | |
137 | unsigned char level; /* level of the class in hierarchy: | |
138 | 0 for leaf classes, and maximal | |
139 | level of children + 1 for nodes. | |
140 | */ | |
141 | ||
142 | psched_time_t last; /* Last end of service */ | |
143 | psched_time_t undertime; | |
144 | long avgidle; | |
145 | long deficit; /* Saved deficit for WRR */ | |
1a13cb63 | 146 | psched_time_t penalized; |
1da177e4 LT |
147 | struct gnet_stats_basic bstats; |
148 | struct gnet_stats_queue qstats; | |
149 | struct gnet_stats_rate_est rate_est; | |
150 | spinlock_t *stats_lock; | |
151 | struct tc_cbq_xstats xstats; | |
152 | ||
153 | struct tcf_proto *filter_list; | |
154 | ||
155 | int refcnt; | |
156 | int filters; | |
157 | ||
158 | struct cbq_class *defaults[TC_PRIO_MAX+1]; | |
159 | }; | |
160 | ||
161 | struct cbq_sched_data | |
162 | { | |
163 | struct cbq_class *classes[16]; /* Hash table of all classes */ | |
164 | int nclasses[TC_CBQ_MAXPRIO+1]; | |
165 | unsigned quanta[TC_CBQ_MAXPRIO+1]; | |
166 | ||
167 | struct cbq_class link; | |
168 | ||
169 | unsigned activemask; | |
170 | struct cbq_class *active[TC_CBQ_MAXPRIO+1]; /* List of all classes | |
171 | with backlog */ | |
172 | ||
173 | #ifdef CONFIG_NET_CLS_POLICE | |
174 | struct cbq_class *rx_class; | |
175 | #endif | |
176 | struct cbq_class *tx_class; | |
177 | struct cbq_class *tx_borrowed; | |
178 | int tx_len; | |
179 | psched_time_t now; /* Cached timestamp */ | |
180 | psched_time_t now_rt; /* Cached real time */ | |
181 | unsigned pmask; | |
182 | ||
1a13cb63 | 183 | struct hrtimer delay_timer; |
88a99354 | 184 | struct qdisc_watchdog watchdog; /* Watchdog timer, |
1da177e4 LT |
185 | started when CBQ has |
186 | backlog, but cannot | |
187 | transmit just now */ | |
88a99354 | 188 | psched_tdiff_t wd_expires; |
1da177e4 LT |
189 | int toplevel; |
190 | u32 hgenerator; | |
191 | }; | |
192 | ||
193 | ||
194 | #define L2T(cl,len) ((cl)->R_tab->data[(len)>>(cl)->R_tab->rate.cell_log]) | |
195 | ||
196 | ||
197 | static __inline__ unsigned cbq_hash(u32 h) | |
198 | { | |
199 | h ^= h>>8; | |
200 | h ^= h>>4; | |
201 | return h&0xF; | |
202 | } | |
203 | ||
204 | static __inline__ struct cbq_class * | |
205 | cbq_class_lookup(struct cbq_sched_data *q, u32 classid) | |
206 | { | |
207 | struct cbq_class *cl; | |
208 | ||
209 | for (cl = q->classes[cbq_hash(classid)]; cl; cl = cl->next) | |
210 | if (cl->classid == classid) | |
211 | return cl; | |
212 | return NULL; | |
213 | } | |
214 | ||
215 | #ifdef CONFIG_NET_CLS_POLICE | |
216 | ||
217 | static struct cbq_class * | |
218 | cbq_reclassify(struct sk_buff *skb, struct cbq_class *this) | |
219 | { | |
220 | struct cbq_class *cl, *new; | |
221 | ||
222 | for (cl = this->tparent; cl; cl = cl->tparent) | |
223 | if ((new = cl->defaults[TC_PRIO_BESTEFFORT]) != NULL && new != this) | |
224 | return new; | |
225 | ||
226 | return NULL; | |
227 | } | |
228 | ||
229 | #endif | |
230 | ||
231 | /* Classify packet. The procedure is pretty complicated, but | |
232 | it allows us to combine link sharing and priority scheduling | |
233 | transparently. | |
234 | ||
235 | Namely, you can put link sharing rules (f.e. route based) at root of CBQ, | |
236 | so that it resolves to split nodes. Then packets are classified | |
237 | by logical priority, or a more specific classifier may be attached | |
238 | to the split node. | |
239 | */ | |
240 | ||
241 | static struct cbq_class * | |
242 | cbq_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr) | |
243 | { | |
244 | struct cbq_sched_data *q = qdisc_priv(sch); | |
245 | struct cbq_class *head = &q->link; | |
246 | struct cbq_class **defmap; | |
247 | struct cbq_class *cl = NULL; | |
248 | u32 prio = skb->priority; | |
249 | struct tcf_result res; | |
250 | ||
251 | /* | |
252 | * Step 1. If skb->priority points to one of our classes, use it. | |
253 | */ | |
254 | if (TC_H_MAJ(prio^sch->handle) == 0 && | |
255 | (cl = cbq_class_lookup(q, prio)) != NULL) | |
256 | return cl; | |
257 | ||
29f1df6c | 258 | *qerr = NET_XMIT_BYPASS; |
1da177e4 LT |
259 | for (;;) { |
260 | int result = 0; | |
261 | defmap = head->defaults; | |
262 | ||
263 | /* | |
264 | * Step 2+n. Apply classifier. | |
265 | */ | |
266 | if (!head->filter_list || (result = tc_classify(skb, head->filter_list, &res)) < 0) | |
267 | goto fallback; | |
268 | ||
269 | if ((cl = (void*)res.class) == NULL) { | |
270 | if (TC_H_MAJ(res.classid)) | |
271 | cl = cbq_class_lookup(q, res.classid); | |
272 | else if ((cl = defmap[res.classid&TC_PRIO_MAX]) == NULL) | |
273 | cl = defmap[TC_PRIO_BESTEFFORT]; | |
274 | ||
275 | if (cl == NULL || cl->level >= head->level) | |
276 | goto fallback; | |
277 | } | |
278 | ||
279 | #ifdef CONFIG_NET_CLS_ACT | |
280 | switch (result) { | |
281 | case TC_ACT_QUEUED: | |
10297b99 | 282 | case TC_ACT_STOLEN: |
1da177e4 LT |
283 | *qerr = NET_XMIT_SUCCESS; |
284 | case TC_ACT_SHOT: | |
285 | return NULL; | |
286 | } | |
287 | #elif defined(CONFIG_NET_CLS_POLICE) | |
288 | switch (result) { | |
289 | case TC_POLICE_RECLASSIFY: | |
290 | return cbq_reclassify(skb, cl); | |
291 | case TC_POLICE_SHOT: | |
292 | return NULL; | |
293 | default: | |
294 | break; | |
295 | } | |
296 | #endif | |
297 | if (cl->level == 0) | |
298 | return cl; | |
299 | ||
300 | /* | |
301 | * Step 3+n. If classifier selected a link sharing class, | |
302 | * apply agency specific classifier. | |
303 | * Repeat this procdure until we hit a leaf node. | |
304 | */ | |
305 | head = cl; | |
306 | } | |
307 | ||
308 | fallback: | |
309 | cl = head; | |
310 | ||
311 | /* | |
312 | * Step 4. No success... | |
313 | */ | |
314 | if (TC_H_MAJ(prio) == 0 && | |
315 | !(cl = head->defaults[prio&TC_PRIO_MAX]) && | |
316 | !(cl = head->defaults[TC_PRIO_BESTEFFORT])) | |
317 | return head; | |
318 | ||
319 | return cl; | |
320 | } | |
321 | ||
322 | /* | |
323 | A packet has just been enqueued on the empty class. | |
324 | cbq_activate_class adds it to the tail of active class list | |
325 | of its priority band. | |
326 | */ | |
327 | ||
328 | static __inline__ void cbq_activate_class(struct cbq_class *cl) | |
329 | { | |
330 | struct cbq_sched_data *q = qdisc_priv(cl->qdisc); | |
331 | int prio = cl->cpriority; | |
332 | struct cbq_class *cl_tail; | |
333 | ||
334 | cl_tail = q->active[prio]; | |
335 | q->active[prio] = cl; | |
336 | ||
337 | if (cl_tail != NULL) { | |
338 | cl->next_alive = cl_tail->next_alive; | |
339 | cl_tail->next_alive = cl; | |
340 | } else { | |
341 | cl->next_alive = cl; | |
342 | q->activemask |= (1<<prio); | |
343 | } | |
344 | } | |
345 | ||
346 | /* | |
347 | Unlink class from active chain. | |
348 | Note that this same procedure is done directly in cbq_dequeue* | |
349 | during round-robin procedure. | |
350 | */ | |
351 | ||
352 | static void cbq_deactivate_class(struct cbq_class *this) | |
353 | { | |
354 | struct cbq_sched_data *q = qdisc_priv(this->qdisc); | |
355 | int prio = this->cpriority; | |
356 | struct cbq_class *cl; | |
357 | struct cbq_class *cl_prev = q->active[prio]; | |
358 | ||
359 | do { | |
360 | cl = cl_prev->next_alive; | |
361 | if (cl == this) { | |
362 | cl_prev->next_alive = cl->next_alive; | |
363 | cl->next_alive = NULL; | |
364 | ||
365 | if (cl == q->active[prio]) { | |
366 | q->active[prio] = cl_prev; | |
367 | if (cl == q->active[prio]) { | |
368 | q->active[prio] = NULL; | |
369 | q->activemask &= ~(1<<prio); | |
370 | return; | |
371 | } | |
372 | } | |
1da177e4 LT |
373 | return; |
374 | } | |
375 | } while ((cl_prev = cl) != q->active[prio]); | |
376 | } | |
377 | ||
378 | static void | |
379 | cbq_mark_toplevel(struct cbq_sched_data *q, struct cbq_class *cl) | |
380 | { | |
381 | int toplevel = q->toplevel; | |
382 | ||
383 | if (toplevel > cl->level && !(cl->q->flags&TCQ_F_THROTTLED)) { | |
384 | psched_time_t now; | |
385 | psched_tdiff_t incr; | |
386 | ||
387 | PSCHED_GET_TIME(now); | |
388 | incr = PSCHED_TDIFF(now, q->now_rt); | |
389 | PSCHED_TADD2(q->now, incr, now); | |
390 | ||
391 | do { | |
392 | if (PSCHED_TLESS(cl->undertime, now)) { | |
393 | q->toplevel = cl->level; | |
394 | return; | |
395 | } | |
396 | } while ((cl=cl->borrow) != NULL && toplevel > cl->level); | |
397 | } | |
398 | } | |
399 | ||
400 | static int | |
401 | cbq_enqueue(struct sk_buff *skb, struct Qdisc *sch) | |
402 | { | |
403 | struct cbq_sched_data *q = qdisc_priv(sch); | |
404 | int len = skb->len; | |
405 | int ret; | |
406 | struct cbq_class *cl = cbq_classify(skb, sch, &ret); | |
407 | ||
408 | #ifdef CONFIG_NET_CLS_POLICE | |
409 | q->rx_class = cl; | |
410 | #endif | |
411 | if (cl == NULL) { | |
29f1df6c | 412 | if (ret == NET_XMIT_BYPASS) |
1da177e4 LT |
413 | sch->qstats.drops++; |
414 | kfree_skb(skb); | |
415 | return ret; | |
416 | } | |
417 | ||
418 | #ifdef CONFIG_NET_CLS_POLICE | |
419 | cl->q->__parent = sch; | |
420 | #endif | |
421 | if ((ret = cl->q->enqueue(skb, cl->q)) == NET_XMIT_SUCCESS) { | |
422 | sch->q.qlen++; | |
423 | sch->bstats.packets++; | |
424 | sch->bstats.bytes+=len; | |
425 | cbq_mark_toplevel(q, cl); | |
426 | if (!cl->next_alive) | |
427 | cbq_activate_class(cl); | |
428 | return ret; | |
429 | } | |
430 | ||
431 | sch->qstats.drops++; | |
432 | cbq_mark_toplevel(q, cl); | |
433 | cl->qstats.drops++; | |
434 | return ret; | |
435 | } | |
436 | ||
437 | static int | |
438 | cbq_requeue(struct sk_buff *skb, struct Qdisc *sch) | |
439 | { | |
440 | struct cbq_sched_data *q = qdisc_priv(sch); | |
441 | struct cbq_class *cl; | |
442 | int ret; | |
443 | ||
444 | if ((cl = q->tx_class) == NULL) { | |
445 | kfree_skb(skb); | |
446 | sch->qstats.drops++; | |
447 | return NET_XMIT_CN; | |
448 | } | |
449 | q->tx_class = NULL; | |
450 | ||
451 | cbq_mark_toplevel(q, cl); | |
452 | ||
453 | #ifdef CONFIG_NET_CLS_POLICE | |
454 | q->rx_class = cl; | |
455 | cl->q->__parent = sch; | |
456 | #endif | |
457 | if ((ret = cl->q->ops->requeue(skb, cl->q)) == 0) { | |
458 | sch->q.qlen++; | |
459 | sch->qstats.requeues++; | |
460 | if (!cl->next_alive) | |
461 | cbq_activate_class(cl); | |
462 | return 0; | |
463 | } | |
464 | sch->qstats.drops++; | |
465 | cl->qstats.drops++; | |
466 | return ret; | |
467 | } | |
468 | ||
469 | /* Overlimit actions */ | |
470 | ||
471 | /* TC_CBQ_OVL_CLASSIC: (default) penalize leaf class by adding offtime */ | |
472 | ||
473 | static void cbq_ovl_classic(struct cbq_class *cl) | |
474 | { | |
475 | struct cbq_sched_data *q = qdisc_priv(cl->qdisc); | |
476 | psched_tdiff_t delay = PSCHED_TDIFF(cl->undertime, q->now); | |
477 | ||
478 | if (!cl->delayed) { | |
479 | delay += cl->offtime; | |
480 | ||
10297b99 | 481 | /* |
1da177e4 LT |
482 | Class goes to sleep, so that it will have no |
483 | chance to work avgidle. Let's forgive it 8) | |
484 | ||
485 | BTW cbq-2.0 has a crap in this | |
486 | place, apparently they forgot to shift it by cl->ewma_log. | |
487 | */ | |
488 | if (cl->avgidle < 0) | |
489 | delay -= (-cl->avgidle) - ((-cl->avgidle) >> cl->ewma_log); | |
490 | if (cl->avgidle < cl->minidle) | |
491 | cl->avgidle = cl->minidle; | |
492 | if (delay <= 0) | |
493 | delay = 1; | |
494 | PSCHED_TADD2(q->now, delay, cl->undertime); | |
495 | ||
496 | cl->xstats.overactions++; | |
497 | cl->delayed = 1; | |
498 | } | |
499 | if (q->wd_expires == 0 || q->wd_expires > delay) | |
500 | q->wd_expires = delay; | |
501 | ||
502 | /* Dirty work! We must schedule wakeups based on | |
503 | real available rate, rather than leaf rate, | |
504 | which may be tiny (even zero). | |
505 | */ | |
506 | if (q->toplevel == TC_CBQ_MAXLEVEL) { | |
507 | struct cbq_class *b; | |
508 | psched_tdiff_t base_delay = q->wd_expires; | |
509 | ||
510 | for (b = cl->borrow; b; b = b->borrow) { | |
511 | delay = PSCHED_TDIFF(b->undertime, q->now); | |
512 | if (delay < base_delay) { | |
513 | if (delay <= 0) | |
514 | delay = 1; | |
515 | base_delay = delay; | |
516 | } | |
517 | } | |
518 | ||
519 | q->wd_expires = base_delay; | |
520 | } | |
521 | } | |
522 | ||
523 | /* TC_CBQ_OVL_RCLASSIC: penalize by offtime classes in hierarchy, when | |
524 | they go overlimit | |
525 | */ | |
526 | ||
527 | static void cbq_ovl_rclassic(struct cbq_class *cl) | |
528 | { | |
529 | struct cbq_sched_data *q = qdisc_priv(cl->qdisc); | |
530 | struct cbq_class *this = cl; | |
531 | ||
532 | do { | |
533 | if (cl->level > q->toplevel) { | |
534 | cl = NULL; | |
535 | break; | |
536 | } | |
537 | } while ((cl = cl->borrow) != NULL); | |
538 | ||
539 | if (cl == NULL) | |
540 | cl = this; | |
541 | cbq_ovl_classic(cl); | |
542 | } | |
543 | ||
544 | /* TC_CBQ_OVL_DELAY: delay until it will go to underlimit */ | |
545 | ||
546 | static void cbq_ovl_delay(struct cbq_class *cl) | |
547 | { | |
548 | struct cbq_sched_data *q = qdisc_priv(cl->qdisc); | |
549 | psched_tdiff_t delay = PSCHED_TDIFF(cl->undertime, q->now); | |
550 | ||
551 | if (!cl->delayed) { | |
1a13cb63 PM |
552 | psched_time_t sched = q->now; |
553 | ktime_t expires; | |
1da177e4 LT |
554 | |
555 | delay += cl->offtime; | |
556 | if (cl->avgidle < 0) | |
557 | delay -= (-cl->avgidle) - ((-cl->avgidle) >> cl->ewma_log); | |
558 | if (cl->avgidle < cl->minidle) | |
559 | cl->avgidle = cl->minidle; | |
560 | PSCHED_TADD2(q->now, delay, cl->undertime); | |
561 | ||
562 | if (delay > 0) { | |
1a13cb63 | 563 | sched += delay + cl->penalty; |
1da177e4 LT |
564 | cl->penalized = sched; |
565 | cl->cpriority = TC_CBQ_MAXPRIO; | |
566 | q->pmask |= (1<<TC_CBQ_MAXPRIO); | |
1a13cb63 PM |
567 | |
568 | expires = ktime_set(0, 0); | |
569 | expires = ktime_add_ns(expires, PSCHED_US2NS(sched)); | |
570 | if (hrtimer_try_to_cancel(&q->delay_timer) && | |
571 | ktime_to_ns(ktime_sub(q->delay_timer.expires, | |
572 | expires)) > 0) | |
573 | q->delay_timer.expires = expires; | |
574 | hrtimer_restart(&q->delay_timer); | |
1da177e4 LT |
575 | cl->delayed = 1; |
576 | cl->xstats.overactions++; | |
577 | return; | |
578 | } | |
579 | delay = 1; | |
580 | } | |
581 | if (q->wd_expires == 0 || q->wd_expires > delay) | |
582 | q->wd_expires = delay; | |
583 | } | |
584 | ||
585 | /* TC_CBQ_OVL_LOWPRIO: penalize class by lowering its priority band */ | |
586 | ||
587 | static void cbq_ovl_lowprio(struct cbq_class *cl) | |
588 | { | |
589 | struct cbq_sched_data *q = qdisc_priv(cl->qdisc); | |
590 | ||
1a13cb63 | 591 | cl->penalized = q->now + cl->penalty; |
1da177e4 LT |
592 | |
593 | if (cl->cpriority != cl->priority2) { | |
594 | cl->cpriority = cl->priority2; | |
595 | q->pmask |= (1<<cl->cpriority); | |
596 | cl->xstats.overactions++; | |
597 | } | |
598 | cbq_ovl_classic(cl); | |
599 | } | |
600 | ||
601 | /* TC_CBQ_OVL_DROP: penalize class by dropping */ | |
602 | ||
603 | static void cbq_ovl_drop(struct cbq_class *cl) | |
604 | { | |
605 | if (cl->q->ops->drop) | |
606 | if (cl->q->ops->drop(cl->q)) | |
607 | cl->qdisc->q.qlen--; | |
608 | cl->xstats.overactions++; | |
609 | cbq_ovl_classic(cl); | |
610 | } | |
611 | ||
1a13cb63 PM |
612 | static psched_tdiff_t cbq_undelay_prio(struct cbq_sched_data *q, int prio, |
613 | psched_time_t now) | |
1da177e4 LT |
614 | { |
615 | struct cbq_class *cl; | |
616 | struct cbq_class *cl_prev = q->active[prio]; | |
1a13cb63 | 617 | psched_time_t sched = now; |
1da177e4 LT |
618 | |
619 | if (cl_prev == NULL) | |
e9054a33 | 620 | return 0; |
1da177e4 LT |
621 | |
622 | do { | |
623 | cl = cl_prev->next_alive; | |
1a13cb63 | 624 | if (now - cl->penalized > 0) { |
1da177e4 LT |
625 | cl_prev->next_alive = cl->next_alive; |
626 | cl->next_alive = NULL; | |
627 | cl->cpriority = cl->priority; | |
628 | cl->delayed = 0; | |
629 | cbq_activate_class(cl); | |
630 | ||
631 | if (cl == q->active[prio]) { | |
632 | q->active[prio] = cl_prev; | |
633 | if (cl == q->active[prio]) { | |
634 | q->active[prio] = NULL; | |
635 | return 0; | |
636 | } | |
637 | } | |
638 | ||
639 | cl = cl_prev->next_alive; | |
1a13cb63 | 640 | } else if (sched - cl->penalized > 0) |
1da177e4 LT |
641 | sched = cl->penalized; |
642 | } while ((cl_prev = cl) != q->active[prio]); | |
643 | ||
1a13cb63 | 644 | return sched - now; |
1da177e4 LT |
645 | } |
646 | ||
1a13cb63 | 647 | static enum hrtimer_restart cbq_undelay(struct hrtimer *timer) |
1da177e4 | 648 | { |
1a13cb63 PM |
649 | struct cbq_sched_data *q = container_of(timer, struct cbq_sched_data, |
650 | delay_timer); | |
651 | struct Qdisc *sch = q->watchdog.qdisc; | |
652 | psched_time_t now; | |
653 | psched_tdiff_t delay = 0; | |
1da177e4 LT |
654 | unsigned pmask; |
655 | ||
1a13cb63 PM |
656 | PSCHED_GET_TIME(now); |
657 | ||
1da177e4 LT |
658 | pmask = q->pmask; |
659 | q->pmask = 0; | |
660 | ||
661 | while (pmask) { | |
662 | int prio = ffz(~pmask); | |
1a13cb63 | 663 | psched_tdiff_t tmp; |
1da177e4 LT |
664 | |
665 | pmask &= ~(1<<prio); | |
666 | ||
1a13cb63 | 667 | tmp = cbq_undelay_prio(q, prio, now); |
1da177e4 LT |
668 | if (tmp > 0) { |
669 | q->pmask |= 1<<prio; | |
670 | if (tmp < delay || delay == 0) | |
671 | delay = tmp; | |
672 | } | |
673 | } | |
674 | ||
675 | if (delay) { | |
1a13cb63 PM |
676 | ktime_t time; |
677 | ||
678 | time = ktime_set(0, 0); | |
679 | time = ktime_add_ns(time, PSCHED_US2NS(now + delay)); | |
680 | hrtimer_start(&q->delay_timer, time, HRTIMER_MODE_ABS); | |
1da177e4 LT |
681 | } |
682 | ||
683 | sch->flags &= ~TCQ_F_THROTTLED; | |
684 | netif_schedule(sch->dev); | |
1a13cb63 | 685 | return HRTIMER_NORESTART; |
1da177e4 LT |
686 | } |
687 | ||
688 | ||
689 | #ifdef CONFIG_NET_CLS_POLICE | |
690 | ||
691 | static int cbq_reshape_fail(struct sk_buff *skb, struct Qdisc *child) | |
692 | { | |
693 | int len = skb->len; | |
694 | struct Qdisc *sch = child->__parent; | |
695 | struct cbq_sched_data *q = qdisc_priv(sch); | |
696 | struct cbq_class *cl = q->rx_class; | |
697 | ||
698 | q->rx_class = NULL; | |
699 | ||
700 | if (cl && (cl = cbq_reclassify(skb, cl)) != NULL) { | |
701 | ||
702 | cbq_mark_toplevel(q, cl); | |
703 | ||
704 | q->rx_class = cl; | |
705 | cl->q->__parent = sch; | |
706 | ||
707 | if (cl->q->enqueue(skb, cl->q) == 0) { | |
708 | sch->q.qlen++; | |
709 | sch->bstats.packets++; | |
710 | sch->bstats.bytes+=len; | |
711 | if (!cl->next_alive) | |
712 | cbq_activate_class(cl); | |
713 | return 0; | |
714 | } | |
715 | sch->qstats.drops++; | |
716 | return 0; | |
717 | } | |
718 | ||
719 | sch->qstats.drops++; | |
720 | return -1; | |
721 | } | |
722 | #endif | |
723 | ||
10297b99 | 724 | /* |
1da177e4 LT |
725 | It is mission critical procedure. |
726 | ||
727 | We "regenerate" toplevel cutoff, if transmitting class | |
728 | has backlog and it is not regulated. It is not part of | |
729 | original CBQ description, but looks more reasonable. | |
730 | Probably, it is wrong. This question needs further investigation. | |
731 | */ | |
732 | ||
733 | static __inline__ void | |
734 | cbq_update_toplevel(struct cbq_sched_data *q, struct cbq_class *cl, | |
735 | struct cbq_class *borrowed) | |
736 | { | |
737 | if (cl && q->toplevel >= borrowed->level) { | |
738 | if (cl->q->q.qlen > 1) { | |
739 | do { | |
740 | if (PSCHED_IS_PASTPERFECT(borrowed->undertime)) { | |
741 | q->toplevel = borrowed->level; | |
742 | return; | |
743 | } | |
744 | } while ((borrowed=borrowed->borrow) != NULL); | |
745 | } | |
10297b99 | 746 | #if 0 |
1da177e4 LT |
747 | /* It is not necessary now. Uncommenting it |
748 | will save CPU cycles, but decrease fairness. | |
749 | */ | |
750 | q->toplevel = TC_CBQ_MAXLEVEL; | |
751 | #endif | |
752 | } | |
753 | } | |
754 | ||
755 | static void | |
756 | cbq_update(struct cbq_sched_data *q) | |
757 | { | |
758 | struct cbq_class *this = q->tx_class; | |
759 | struct cbq_class *cl = this; | |
760 | int len = q->tx_len; | |
761 | ||
762 | q->tx_class = NULL; | |
763 | ||
764 | for ( ; cl; cl = cl->share) { | |
765 | long avgidle = cl->avgidle; | |
766 | long idle; | |
767 | ||
768 | cl->bstats.packets++; | |
769 | cl->bstats.bytes += len; | |
770 | ||
771 | /* | |
772 | (now - last) is total time between packet right edges. | |
773 | (last_pktlen/rate) is "virtual" busy time, so that | |
774 | ||
10297b99 | 775 | idle = (now - last) - last_pktlen/rate |
1da177e4 LT |
776 | */ |
777 | ||
778 | idle = PSCHED_TDIFF(q->now, cl->last); | |
779 | if ((unsigned long)idle > 128*1024*1024) { | |
780 | avgidle = cl->maxidle; | |
781 | } else { | |
782 | idle -= L2T(cl, len); | |
783 | ||
784 | /* true_avgidle := (1-W)*true_avgidle + W*idle, | |
785 | where W=2^{-ewma_log}. But cl->avgidle is scaled: | |
786 | cl->avgidle == true_avgidle/W, | |
787 | hence: | |
788 | */ | |
789 | avgidle += idle - (avgidle>>cl->ewma_log); | |
790 | } | |
791 | ||
792 | if (avgidle <= 0) { | |
793 | /* Overlimit or at-limit */ | |
794 | ||
795 | if (avgidle < cl->minidle) | |
796 | avgidle = cl->minidle; | |
797 | ||
798 | cl->avgidle = avgidle; | |
799 | ||
800 | /* Calculate expected time, when this class | |
801 | will be allowed to send. | |
802 | It will occur, when: | |
803 | (1-W)*true_avgidle + W*delay = 0, i.e. | |
804 | idle = (1/W - 1)*(-true_avgidle) | |
805 | or | |
806 | idle = (1 - W)*(-cl->avgidle); | |
807 | */ | |
808 | idle = (-avgidle) - ((-avgidle) >> cl->ewma_log); | |
809 | ||
810 | /* | |
811 | That is not all. | |
812 | To maintain the rate allocated to the class, | |
813 | we add to undertime virtual clock, | |
814 | necessary to complete transmitted packet. | |
815 | (len/phys_bandwidth has been already passed | |
816 | to the moment of cbq_update) | |
817 | */ | |
818 | ||
819 | idle -= L2T(&q->link, len); | |
820 | idle += L2T(cl, len); | |
821 | ||
822 | PSCHED_AUDIT_TDIFF(idle); | |
823 | ||
824 | PSCHED_TADD2(q->now, idle, cl->undertime); | |
825 | } else { | |
826 | /* Underlimit */ | |
827 | ||
828 | PSCHED_SET_PASTPERFECT(cl->undertime); | |
829 | if (avgidle > cl->maxidle) | |
830 | cl->avgidle = cl->maxidle; | |
831 | else | |
832 | cl->avgidle = avgidle; | |
833 | } | |
834 | cl->last = q->now; | |
835 | } | |
836 | ||
837 | cbq_update_toplevel(q, this, q->tx_borrowed); | |
838 | } | |
839 | ||
840 | static __inline__ struct cbq_class * | |
841 | cbq_under_limit(struct cbq_class *cl) | |
842 | { | |
843 | struct cbq_sched_data *q = qdisc_priv(cl->qdisc); | |
844 | struct cbq_class *this_cl = cl; | |
845 | ||
846 | if (cl->tparent == NULL) | |
847 | return cl; | |
848 | ||
849 | if (PSCHED_IS_PASTPERFECT(cl->undertime) || | |
850 | !PSCHED_TLESS(q->now, cl->undertime)) { | |
851 | cl->delayed = 0; | |
852 | return cl; | |
853 | } | |
854 | ||
855 | do { | |
856 | /* It is very suspicious place. Now overlimit | |
857 | action is generated for not bounded classes | |
858 | only if link is completely congested. | |
859 | Though it is in agree with ancestor-only paradigm, | |
860 | it looks very stupid. Particularly, | |
861 | it means that this chunk of code will either | |
862 | never be called or result in strong amplification | |
863 | of burstiness. Dangerous, silly, and, however, | |
864 | no another solution exists. | |
865 | */ | |
866 | if ((cl = cl->borrow) == NULL) { | |
867 | this_cl->qstats.overlimits++; | |
868 | this_cl->overlimit(this_cl); | |
869 | return NULL; | |
870 | } | |
871 | if (cl->level > q->toplevel) | |
872 | return NULL; | |
873 | } while (!PSCHED_IS_PASTPERFECT(cl->undertime) && | |
874 | PSCHED_TLESS(q->now, cl->undertime)); | |
875 | ||
876 | cl->delayed = 0; | |
877 | return cl; | |
878 | } | |
879 | ||
880 | static __inline__ struct sk_buff * | |
881 | cbq_dequeue_prio(struct Qdisc *sch, int prio) | |
882 | { | |
883 | struct cbq_sched_data *q = qdisc_priv(sch); | |
884 | struct cbq_class *cl_tail, *cl_prev, *cl; | |
885 | struct sk_buff *skb; | |
886 | int deficit; | |
887 | ||
888 | cl_tail = cl_prev = q->active[prio]; | |
889 | cl = cl_prev->next_alive; | |
890 | ||
891 | do { | |
892 | deficit = 0; | |
893 | ||
894 | /* Start round */ | |
895 | do { | |
896 | struct cbq_class *borrow = cl; | |
897 | ||
898 | if (cl->q->q.qlen && | |
899 | (borrow = cbq_under_limit(cl)) == NULL) | |
900 | goto skip_class; | |
901 | ||
902 | if (cl->deficit <= 0) { | |
903 | /* Class exhausted its allotment per | |
904 | this round. Switch to the next one. | |
905 | */ | |
906 | deficit = 1; | |
907 | cl->deficit += cl->quantum; | |
908 | goto next_class; | |
909 | } | |
910 | ||
911 | skb = cl->q->dequeue(cl->q); | |
912 | ||
913 | /* Class did not give us any skb :-( | |
10297b99 | 914 | It could occur even if cl->q->q.qlen != 0 |
1da177e4 LT |
915 | f.e. if cl->q == "tbf" |
916 | */ | |
917 | if (skb == NULL) | |
918 | goto skip_class; | |
919 | ||
920 | cl->deficit -= skb->len; | |
921 | q->tx_class = cl; | |
922 | q->tx_borrowed = borrow; | |
923 | if (borrow != cl) { | |
924 | #ifndef CBQ_XSTATS_BORROWS_BYTES | |
925 | borrow->xstats.borrows++; | |
926 | cl->xstats.borrows++; | |
927 | #else | |
928 | borrow->xstats.borrows += skb->len; | |
929 | cl->xstats.borrows += skb->len; | |
930 | #endif | |
931 | } | |
932 | q->tx_len = skb->len; | |
933 | ||
934 | if (cl->deficit <= 0) { | |
935 | q->active[prio] = cl; | |
936 | cl = cl->next_alive; | |
937 | cl->deficit += cl->quantum; | |
938 | } | |
939 | return skb; | |
940 | ||
941 | skip_class: | |
942 | if (cl->q->q.qlen == 0 || prio != cl->cpriority) { | |
943 | /* Class is empty or penalized. | |
944 | Unlink it from active chain. | |
945 | */ | |
946 | cl_prev->next_alive = cl->next_alive; | |
947 | cl->next_alive = NULL; | |
948 | ||
949 | /* Did cl_tail point to it? */ | |
950 | if (cl == cl_tail) { | |
951 | /* Repair it! */ | |
952 | cl_tail = cl_prev; | |
953 | ||
954 | /* Was it the last class in this band? */ | |
955 | if (cl == cl_tail) { | |
956 | /* Kill the band! */ | |
957 | q->active[prio] = NULL; | |
958 | q->activemask &= ~(1<<prio); | |
959 | if (cl->q->q.qlen) | |
960 | cbq_activate_class(cl); | |
961 | return NULL; | |
962 | } | |
963 | ||
964 | q->active[prio] = cl_tail; | |
965 | } | |
966 | if (cl->q->q.qlen) | |
967 | cbq_activate_class(cl); | |
968 | ||
969 | cl = cl_prev; | |
970 | } | |
971 | ||
972 | next_class: | |
973 | cl_prev = cl; | |
974 | cl = cl->next_alive; | |
975 | } while (cl_prev != cl_tail); | |
976 | } while (deficit); | |
977 | ||
978 | q->active[prio] = cl_prev; | |
979 | ||
980 | return NULL; | |
981 | } | |
982 | ||
983 | static __inline__ struct sk_buff * | |
984 | cbq_dequeue_1(struct Qdisc *sch) | |
985 | { | |
986 | struct cbq_sched_data *q = qdisc_priv(sch); | |
987 | struct sk_buff *skb; | |
988 | unsigned activemask; | |
989 | ||
990 | activemask = q->activemask&0xFF; | |
991 | while (activemask) { | |
992 | int prio = ffz(~activemask); | |
993 | activemask &= ~(1<<prio); | |
994 | skb = cbq_dequeue_prio(sch, prio); | |
995 | if (skb) | |
996 | return skb; | |
997 | } | |
998 | return NULL; | |
999 | } | |
1000 | ||
1001 | static struct sk_buff * | |
1002 | cbq_dequeue(struct Qdisc *sch) | |
1003 | { | |
1004 | struct sk_buff *skb; | |
1005 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1006 | psched_time_t now; | |
1007 | psched_tdiff_t incr; | |
1008 | ||
1009 | PSCHED_GET_TIME(now); | |
1010 | incr = PSCHED_TDIFF(now, q->now_rt); | |
1011 | ||
1012 | if (q->tx_class) { | |
1013 | psched_tdiff_t incr2; | |
1014 | /* Time integrator. We calculate EOS time | |
1015 | by adding expected packet transmission time. | |
1016 | If real time is greater, we warp artificial clock, | |
1017 | so that: | |
1018 | ||
1019 | cbq_time = max(real_time, work); | |
1020 | */ | |
1021 | incr2 = L2T(&q->link, q->tx_len); | |
1022 | PSCHED_TADD(q->now, incr2); | |
1023 | cbq_update(q); | |
1024 | if ((incr -= incr2) < 0) | |
1025 | incr = 0; | |
1026 | } | |
1027 | PSCHED_TADD(q->now, incr); | |
1028 | q->now_rt = now; | |
1029 | ||
1030 | for (;;) { | |
1031 | q->wd_expires = 0; | |
1032 | ||
1033 | skb = cbq_dequeue_1(sch); | |
1034 | if (skb) { | |
1035 | sch->q.qlen--; | |
1036 | sch->flags &= ~TCQ_F_THROTTLED; | |
1037 | return skb; | |
1038 | } | |
1039 | ||
1040 | /* All the classes are overlimit. | |
1041 | ||
1042 | It is possible, if: | |
1043 | ||
1044 | 1. Scheduler is empty. | |
1045 | 2. Toplevel cutoff inhibited borrowing. | |
1046 | 3. Root class is overlimit. | |
1047 | ||
1048 | Reset 2d and 3d conditions and retry. | |
1049 | ||
1050 | Note, that NS and cbq-2.0 are buggy, peeking | |
1051 | an arbitrary class is appropriate for ancestor-only | |
1052 | sharing, but not for toplevel algorithm. | |
1053 | ||
1054 | Our version is better, but slower, because it requires | |
1055 | two passes, but it is unavoidable with top-level sharing. | |
1056 | */ | |
1057 | ||
1058 | if (q->toplevel == TC_CBQ_MAXLEVEL && | |
1059 | PSCHED_IS_PASTPERFECT(q->link.undertime)) | |
1060 | break; | |
1061 | ||
1062 | q->toplevel = TC_CBQ_MAXLEVEL; | |
1063 | PSCHED_SET_PASTPERFECT(q->link.undertime); | |
1064 | } | |
1065 | ||
1066 | /* No packets in scheduler or nobody wants to give them to us :-( | |
1067 | Sigh... start watchdog timer in the last case. */ | |
1068 | ||
1069 | if (sch->q.qlen) { | |
1070 | sch->qstats.overlimits++; | |
88a99354 PM |
1071 | if (q->wd_expires) |
1072 | qdisc_watchdog_schedule(&q->watchdog, | |
1073 | q->now + q->wd_expires); | |
1da177e4 LT |
1074 | } |
1075 | return NULL; | |
1076 | } | |
1077 | ||
1078 | /* CBQ class maintanance routines */ | |
1079 | ||
1080 | static void cbq_adjust_levels(struct cbq_class *this) | |
1081 | { | |
1082 | if (this == NULL) | |
1083 | return; | |
1084 | ||
1085 | do { | |
1086 | int level = 0; | |
1087 | struct cbq_class *cl; | |
1088 | ||
1089 | if ((cl = this->children) != NULL) { | |
1090 | do { | |
1091 | if (cl->level > level) | |
1092 | level = cl->level; | |
1093 | } while ((cl = cl->sibling) != this->children); | |
1094 | } | |
1095 | this->level = level+1; | |
1096 | } while ((this = this->tparent) != NULL); | |
1097 | } | |
1098 | ||
1099 | static void cbq_normalize_quanta(struct cbq_sched_data *q, int prio) | |
1100 | { | |
1101 | struct cbq_class *cl; | |
1102 | unsigned h; | |
1103 | ||
1104 | if (q->quanta[prio] == 0) | |
1105 | return; | |
1106 | ||
1107 | for (h=0; h<16; h++) { | |
1108 | for (cl = q->classes[h]; cl; cl = cl->next) { | |
1109 | /* BUGGGG... Beware! This expression suffer of | |
1110 | arithmetic overflows! | |
1111 | */ | |
1112 | if (cl->priority == prio) { | |
1113 | cl->quantum = (cl->weight*cl->allot*q->nclasses[prio])/ | |
1114 | q->quanta[prio]; | |
1115 | } | |
1116 | if (cl->quantum <= 0 || cl->quantum>32*cl->qdisc->dev->mtu) { | |
1117 | printk(KERN_WARNING "CBQ: class %08x has bad quantum==%ld, repaired.\n", cl->classid, cl->quantum); | |
1118 | cl->quantum = cl->qdisc->dev->mtu/2 + 1; | |
1119 | } | |
1120 | } | |
1121 | } | |
1122 | } | |
1123 | ||
1124 | static void cbq_sync_defmap(struct cbq_class *cl) | |
1125 | { | |
1126 | struct cbq_sched_data *q = qdisc_priv(cl->qdisc); | |
1127 | struct cbq_class *split = cl->split; | |
1128 | unsigned h; | |
1129 | int i; | |
1130 | ||
1131 | if (split == NULL) | |
1132 | return; | |
1133 | ||
1134 | for (i=0; i<=TC_PRIO_MAX; i++) { | |
1135 | if (split->defaults[i] == cl && !(cl->defmap&(1<<i))) | |
1136 | split->defaults[i] = NULL; | |
1137 | } | |
1138 | ||
1139 | for (i=0; i<=TC_PRIO_MAX; i++) { | |
1140 | int level = split->level; | |
1141 | ||
1142 | if (split->defaults[i]) | |
1143 | continue; | |
1144 | ||
1145 | for (h=0; h<16; h++) { | |
1146 | struct cbq_class *c; | |
1147 | ||
1148 | for (c = q->classes[h]; c; c = c->next) { | |
1149 | if (c->split == split && c->level < level && | |
1150 | c->defmap&(1<<i)) { | |
1151 | split->defaults[i] = c; | |
1152 | level = c->level; | |
1153 | } | |
1154 | } | |
1155 | } | |
1156 | } | |
1157 | } | |
1158 | ||
1159 | static void cbq_change_defmap(struct cbq_class *cl, u32 splitid, u32 def, u32 mask) | |
1160 | { | |
1161 | struct cbq_class *split = NULL; | |
1162 | ||
1163 | if (splitid == 0) { | |
1164 | if ((split = cl->split) == NULL) | |
1165 | return; | |
1166 | splitid = split->classid; | |
1167 | } | |
1168 | ||
1169 | if (split == NULL || split->classid != splitid) { | |
1170 | for (split = cl->tparent; split; split = split->tparent) | |
1171 | if (split->classid == splitid) | |
1172 | break; | |
1173 | } | |
1174 | ||
1175 | if (split == NULL) | |
1176 | return; | |
1177 | ||
1178 | if (cl->split != split) { | |
1179 | cl->defmap = 0; | |
1180 | cbq_sync_defmap(cl); | |
1181 | cl->split = split; | |
1182 | cl->defmap = def&mask; | |
1183 | } else | |
1184 | cl->defmap = (cl->defmap&~mask)|(def&mask); | |
1185 | ||
1186 | cbq_sync_defmap(cl); | |
1187 | } | |
1188 | ||
1189 | static void cbq_unlink_class(struct cbq_class *this) | |
1190 | { | |
1191 | struct cbq_class *cl, **clp; | |
1192 | struct cbq_sched_data *q = qdisc_priv(this->qdisc); | |
1193 | ||
1194 | for (clp = &q->classes[cbq_hash(this->classid)]; (cl = *clp) != NULL; clp = &cl->next) { | |
1195 | if (cl == this) { | |
1196 | *clp = cl->next; | |
1197 | cl->next = NULL; | |
1198 | break; | |
1199 | } | |
1200 | } | |
1201 | ||
1202 | if (this->tparent) { | |
1203 | clp=&this->sibling; | |
1204 | cl = *clp; | |
1205 | do { | |
1206 | if (cl == this) { | |
1207 | *clp = cl->sibling; | |
1208 | break; | |
1209 | } | |
1210 | clp = &cl->sibling; | |
1211 | } while ((cl = *clp) != this->sibling); | |
1212 | ||
1213 | if (this->tparent->children == this) { | |
1214 | this->tparent->children = this->sibling; | |
1215 | if (this->sibling == this) | |
1216 | this->tparent->children = NULL; | |
1217 | } | |
1218 | } else { | |
1219 | BUG_TRAP(this->sibling == this); | |
1220 | } | |
1221 | } | |
1222 | ||
1223 | static void cbq_link_class(struct cbq_class *this) | |
1224 | { | |
1225 | struct cbq_sched_data *q = qdisc_priv(this->qdisc); | |
1226 | unsigned h = cbq_hash(this->classid); | |
1227 | struct cbq_class *parent = this->tparent; | |
1228 | ||
1229 | this->sibling = this; | |
1230 | this->next = q->classes[h]; | |
1231 | q->classes[h] = this; | |
1232 | ||
1233 | if (parent == NULL) | |
1234 | return; | |
1235 | ||
1236 | if (parent->children == NULL) { | |
1237 | parent->children = this; | |
1238 | } else { | |
1239 | this->sibling = parent->children->sibling; | |
1240 | parent->children->sibling = this; | |
1241 | } | |
1242 | } | |
1243 | ||
1244 | static unsigned int cbq_drop(struct Qdisc* sch) | |
1245 | { | |
1246 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1247 | struct cbq_class *cl, *cl_head; | |
1248 | int prio; | |
1249 | unsigned int len; | |
1250 | ||
1251 | for (prio = TC_CBQ_MAXPRIO; prio >= 0; prio--) { | |
1252 | if ((cl_head = q->active[prio]) == NULL) | |
1253 | continue; | |
1254 | ||
1255 | cl = cl_head; | |
1256 | do { | |
1257 | if (cl->q->ops->drop && (len = cl->q->ops->drop(cl->q))) { | |
1258 | sch->q.qlen--; | |
a37ef2e3 JP |
1259 | if (!cl->q->q.qlen) |
1260 | cbq_deactivate_class(cl); | |
1da177e4 LT |
1261 | return len; |
1262 | } | |
1263 | } while ((cl = cl->next_alive) != cl_head); | |
1264 | } | |
1265 | return 0; | |
1266 | } | |
1267 | ||
1268 | static void | |
1269 | cbq_reset(struct Qdisc* sch) | |
1270 | { | |
1271 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1272 | struct cbq_class *cl; | |
1273 | int prio; | |
1274 | unsigned h; | |
1275 | ||
1276 | q->activemask = 0; | |
1277 | q->pmask = 0; | |
1278 | q->tx_class = NULL; | |
1279 | q->tx_borrowed = NULL; | |
88a99354 | 1280 | qdisc_watchdog_cancel(&q->watchdog); |
1a13cb63 | 1281 | hrtimer_cancel(&q->delay_timer); |
1da177e4 LT |
1282 | q->toplevel = TC_CBQ_MAXLEVEL; |
1283 | PSCHED_GET_TIME(q->now); | |
1284 | q->now_rt = q->now; | |
1285 | ||
1286 | for (prio = 0; prio <= TC_CBQ_MAXPRIO; prio++) | |
1287 | q->active[prio] = NULL; | |
1288 | ||
1289 | for (h = 0; h < 16; h++) { | |
1290 | for (cl = q->classes[h]; cl; cl = cl->next) { | |
1291 | qdisc_reset(cl->q); | |
1292 | ||
1293 | cl->next_alive = NULL; | |
1294 | PSCHED_SET_PASTPERFECT(cl->undertime); | |
1295 | cl->avgidle = cl->maxidle; | |
1296 | cl->deficit = cl->quantum; | |
1297 | cl->cpriority = cl->priority; | |
1298 | } | |
1299 | } | |
1300 | sch->q.qlen = 0; | |
1301 | } | |
1302 | ||
1303 | ||
1304 | static int cbq_set_lss(struct cbq_class *cl, struct tc_cbq_lssopt *lss) | |
1305 | { | |
1306 | if (lss->change&TCF_CBQ_LSS_FLAGS) { | |
1307 | cl->share = (lss->flags&TCF_CBQ_LSS_ISOLATED) ? NULL : cl->tparent; | |
1308 | cl->borrow = (lss->flags&TCF_CBQ_LSS_BOUNDED) ? NULL : cl->tparent; | |
1309 | } | |
1310 | if (lss->change&TCF_CBQ_LSS_EWMA) | |
1311 | cl->ewma_log = lss->ewma_log; | |
1312 | if (lss->change&TCF_CBQ_LSS_AVPKT) | |
1313 | cl->avpkt = lss->avpkt; | |
1314 | if (lss->change&TCF_CBQ_LSS_MINIDLE) | |
1315 | cl->minidle = -(long)lss->minidle; | |
1316 | if (lss->change&TCF_CBQ_LSS_MAXIDLE) { | |
1317 | cl->maxidle = lss->maxidle; | |
1318 | cl->avgidle = lss->maxidle; | |
1319 | } | |
1320 | if (lss->change&TCF_CBQ_LSS_OFFTIME) | |
1321 | cl->offtime = lss->offtime; | |
1322 | return 0; | |
1323 | } | |
1324 | ||
1325 | static void cbq_rmprio(struct cbq_sched_data *q, struct cbq_class *cl) | |
1326 | { | |
1327 | q->nclasses[cl->priority]--; | |
1328 | q->quanta[cl->priority] -= cl->weight; | |
1329 | cbq_normalize_quanta(q, cl->priority); | |
1330 | } | |
1331 | ||
1332 | static void cbq_addprio(struct cbq_sched_data *q, struct cbq_class *cl) | |
1333 | { | |
1334 | q->nclasses[cl->priority]++; | |
1335 | q->quanta[cl->priority] += cl->weight; | |
1336 | cbq_normalize_quanta(q, cl->priority); | |
1337 | } | |
1338 | ||
1339 | static int cbq_set_wrr(struct cbq_class *cl, struct tc_cbq_wrropt *wrr) | |
1340 | { | |
1341 | struct cbq_sched_data *q = qdisc_priv(cl->qdisc); | |
1342 | ||
1343 | if (wrr->allot) | |
1344 | cl->allot = wrr->allot; | |
1345 | if (wrr->weight) | |
1346 | cl->weight = wrr->weight; | |
1347 | if (wrr->priority) { | |
1348 | cl->priority = wrr->priority-1; | |
1349 | cl->cpriority = cl->priority; | |
1350 | if (cl->priority >= cl->priority2) | |
1351 | cl->priority2 = TC_CBQ_MAXPRIO-1; | |
1352 | } | |
1353 | ||
1354 | cbq_addprio(q, cl); | |
1355 | return 0; | |
1356 | } | |
1357 | ||
1358 | static int cbq_set_overlimit(struct cbq_class *cl, struct tc_cbq_ovl *ovl) | |
1359 | { | |
1360 | switch (ovl->strategy) { | |
1361 | case TC_CBQ_OVL_CLASSIC: | |
1362 | cl->overlimit = cbq_ovl_classic; | |
1363 | break; | |
1364 | case TC_CBQ_OVL_DELAY: | |
1365 | cl->overlimit = cbq_ovl_delay; | |
1366 | break; | |
1367 | case TC_CBQ_OVL_LOWPRIO: | |
1368 | if (ovl->priority2-1 >= TC_CBQ_MAXPRIO || | |
1369 | ovl->priority2-1 <= cl->priority) | |
1370 | return -EINVAL; | |
1371 | cl->priority2 = ovl->priority2-1; | |
1372 | cl->overlimit = cbq_ovl_lowprio; | |
1373 | break; | |
1374 | case TC_CBQ_OVL_DROP: | |
1375 | cl->overlimit = cbq_ovl_drop; | |
1376 | break; | |
1377 | case TC_CBQ_OVL_RCLASSIC: | |
1378 | cl->overlimit = cbq_ovl_rclassic; | |
1379 | break; | |
1380 | default: | |
1381 | return -EINVAL; | |
1382 | } | |
1a13cb63 | 1383 | cl->penalty = ovl->penalty; |
1da177e4 LT |
1384 | return 0; |
1385 | } | |
1386 | ||
1387 | #ifdef CONFIG_NET_CLS_POLICE | |
1388 | static int cbq_set_police(struct cbq_class *cl, struct tc_cbq_police *p) | |
1389 | { | |
1390 | cl->police = p->police; | |
1391 | ||
1392 | if (cl->q->handle) { | |
1393 | if (p->police == TC_POLICE_RECLASSIFY) | |
1394 | cl->q->reshape_fail = cbq_reshape_fail; | |
1395 | else | |
1396 | cl->q->reshape_fail = NULL; | |
1397 | } | |
1398 | return 0; | |
1399 | } | |
1400 | #endif | |
1401 | ||
1402 | static int cbq_set_fopt(struct cbq_class *cl, struct tc_cbq_fopt *fopt) | |
1403 | { | |
1404 | cbq_change_defmap(cl, fopt->split, fopt->defmap, fopt->defchange); | |
1405 | return 0; | |
1406 | } | |
1407 | ||
1408 | static int cbq_init(struct Qdisc *sch, struct rtattr *opt) | |
1409 | { | |
1410 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1411 | struct rtattr *tb[TCA_CBQ_MAX]; | |
1412 | struct tc_ratespec *r; | |
1413 | ||
1414 | if (rtattr_parse_nested(tb, TCA_CBQ_MAX, opt) < 0 || | |
1415 | tb[TCA_CBQ_RTAB-1] == NULL || tb[TCA_CBQ_RATE-1] == NULL || | |
1416 | RTA_PAYLOAD(tb[TCA_CBQ_RATE-1]) < sizeof(struct tc_ratespec)) | |
1417 | return -EINVAL; | |
1418 | ||
1419 | if (tb[TCA_CBQ_LSSOPT-1] && | |
1420 | RTA_PAYLOAD(tb[TCA_CBQ_LSSOPT-1]) < sizeof(struct tc_cbq_lssopt)) | |
1421 | return -EINVAL; | |
1422 | ||
1423 | r = RTA_DATA(tb[TCA_CBQ_RATE-1]); | |
1424 | ||
1425 | if ((q->link.R_tab = qdisc_get_rtab(r, tb[TCA_CBQ_RTAB-1])) == NULL) | |
1426 | return -EINVAL; | |
1427 | ||
1428 | q->link.refcnt = 1; | |
1429 | q->link.sibling = &q->link; | |
1430 | q->link.classid = sch->handle; | |
1431 | q->link.qdisc = sch; | |
9f9afec4 PM |
1432 | if (!(q->link.q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops, |
1433 | sch->handle))) | |
1da177e4 LT |
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 | ||
88a99354 | 1450 | qdisc_watchdog_init(&q->watchdog, sch); |
1a13cb63 | 1451 | hrtimer_init(&q->delay_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); |
1da177e4 LT |
1452 | q->delay_timer.function = cbq_undelay; |
1453 | q->toplevel = TC_CBQ_MAXLEVEL; | |
1454 | PSCHED_GET_TIME(q->now); | |
1455 | q->now_rt = q->now; | |
1456 | ||
1457 | cbq_link_class(&q->link); | |
1458 | ||
1459 | if (tb[TCA_CBQ_LSSOPT-1]) | |
1460 | cbq_set_lss(&q->link, RTA_DATA(tb[TCA_CBQ_LSSOPT-1])); | |
1461 | ||
1462 | cbq_addprio(q, &q->link); | |
1463 | return 0; | |
1464 | } | |
1465 | ||
1466 | static __inline__ int cbq_dump_rate(struct sk_buff *skb, struct cbq_class *cl) | |
1467 | { | |
1468 | unsigned char *b = skb->tail; | |
1469 | ||
1470 | RTA_PUT(skb, TCA_CBQ_RATE, sizeof(cl->R_tab->rate), &cl->R_tab->rate); | |
1471 | return skb->len; | |
1472 | ||
1473 | rtattr_failure: | |
1474 | skb_trim(skb, b - skb->data); | |
1475 | return -1; | |
1476 | } | |
1477 | ||
1478 | static __inline__ int cbq_dump_lss(struct sk_buff *skb, struct cbq_class *cl) | |
1479 | { | |
1480 | unsigned char *b = skb->tail; | |
1481 | struct tc_cbq_lssopt opt; | |
1482 | ||
1483 | opt.flags = 0; | |
1484 | if (cl->borrow == NULL) | |
1485 | opt.flags |= TCF_CBQ_LSS_BOUNDED; | |
1486 | if (cl->share == NULL) | |
1487 | opt.flags |= TCF_CBQ_LSS_ISOLATED; | |
1488 | opt.ewma_log = cl->ewma_log; | |
1489 | opt.level = cl->level; | |
1490 | opt.avpkt = cl->avpkt; | |
1491 | opt.maxidle = cl->maxidle; | |
1492 | opt.minidle = (u32)(-cl->minidle); | |
1493 | opt.offtime = cl->offtime; | |
1494 | opt.change = ~0; | |
1495 | RTA_PUT(skb, TCA_CBQ_LSSOPT, sizeof(opt), &opt); | |
1496 | return skb->len; | |
1497 | ||
1498 | rtattr_failure: | |
1499 | skb_trim(skb, b - skb->data); | |
1500 | return -1; | |
1501 | } | |
1502 | ||
1503 | static __inline__ int cbq_dump_wrr(struct sk_buff *skb, struct cbq_class *cl) | |
1504 | { | |
1505 | unsigned char *b = skb->tail; | |
1506 | struct tc_cbq_wrropt opt; | |
1507 | ||
1508 | opt.flags = 0; | |
1509 | opt.allot = cl->allot; | |
1510 | opt.priority = cl->priority+1; | |
1511 | opt.cpriority = cl->cpriority+1; | |
1512 | opt.weight = cl->weight; | |
1513 | RTA_PUT(skb, TCA_CBQ_WRROPT, sizeof(opt), &opt); | |
1514 | return skb->len; | |
1515 | ||
1516 | rtattr_failure: | |
1517 | skb_trim(skb, b - skb->data); | |
1518 | return -1; | |
1519 | } | |
1520 | ||
1521 | static __inline__ int cbq_dump_ovl(struct sk_buff *skb, struct cbq_class *cl) | |
1522 | { | |
1523 | unsigned char *b = skb->tail; | |
1524 | struct tc_cbq_ovl opt; | |
1525 | ||
1526 | opt.strategy = cl->ovl_strategy; | |
1527 | opt.priority2 = cl->priority2+1; | |
8a47077a | 1528 | opt.pad = 0; |
1a13cb63 | 1529 | opt.penalty = cl->penalty; |
1da177e4 LT |
1530 | RTA_PUT(skb, TCA_CBQ_OVL_STRATEGY, sizeof(opt), &opt); |
1531 | return skb->len; | |
1532 | ||
1533 | rtattr_failure: | |
1534 | skb_trim(skb, b - skb->data); | |
1535 | return -1; | |
1536 | } | |
1537 | ||
1538 | static __inline__ int cbq_dump_fopt(struct sk_buff *skb, struct cbq_class *cl) | |
1539 | { | |
1540 | unsigned char *b = skb->tail; | |
1541 | struct tc_cbq_fopt opt; | |
1542 | ||
1543 | if (cl->split || cl->defmap) { | |
1544 | opt.split = cl->split ? cl->split->classid : 0; | |
1545 | opt.defmap = cl->defmap; | |
1546 | opt.defchange = ~0; | |
1547 | RTA_PUT(skb, TCA_CBQ_FOPT, sizeof(opt), &opt); | |
1548 | } | |
1549 | return skb->len; | |
1550 | ||
1551 | rtattr_failure: | |
1552 | skb_trim(skb, b - skb->data); | |
1553 | return -1; | |
1554 | } | |
1555 | ||
1556 | #ifdef CONFIG_NET_CLS_POLICE | |
1557 | static __inline__ int cbq_dump_police(struct sk_buff *skb, struct cbq_class *cl) | |
1558 | { | |
1559 | unsigned char *b = skb->tail; | |
1560 | struct tc_cbq_police opt; | |
1561 | ||
1562 | if (cl->police) { | |
1563 | opt.police = cl->police; | |
9ef1d4c7 PM |
1564 | opt.__res1 = 0; |
1565 | opt.__res2 = 0; | |
1da177e4 LT |
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) { | |
9f9afec4 PM |
1675 | if ((new = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops, |
1676 | cl->classid)) == NULL) | |
1da177e4 LT |
1677 | return -ENOBUFS; |
1678 | } else { | |
1679 | #ifdef CONFIG_NET_CLS_POLICE | |
1680 | if (cl->police == TC_POLICE_RECLASSIFY) | |
1681 | new->reshape_fail = cbq_reshape_fail; | |
1682 | #endif | |
1683 | } | |
1684 | sch_tree_lock(sch); | |
a37ef2e3 | 1685 | *old = xchg(&cl->q, new); |
5e50da01 | 1686 | qdisc_tree_decrease_qlen(*old, (*old)->q.qlen); |
1da177e4 LT |
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 | ||
a37ef2e3 JP |
1703 | static void cbq_qlen_notify(struct Qdisc *sch, unsigned long arg) |
1704 | { | |
1705 | struct cbq_class *cl = (struct cbq_class *)arg; | |
1706 | ||
1707 | if (cl->q->q.qlen == 0) | |
1708 | cbq_deactivate_class(cl); | |
1709 | } | |
1710 | ||
1da177e4 LT |
1711 | static unsigned long cbq_get(struct Qdisc *sch, u32 classid) |
1712 | { | |
1713 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1714 | struct cbq_class *cl = cbq_class_lookup(q, classid); | |
1715 | ||
1716 | if (cl) { | |
1717 | cl->refcnt++; | |
1718 | return (unsigned long)cl; | |
1719 | } | |
1720 | return 0; | |
1721 | } | |
1722 | ||
1723 | static void cbq_destroy_filters(struct cbq_class *cl) | |
1724 | { | |
1725 | struct tcf_proto *tp; | |
1726 | ||
1727 | while ((tp = cl->filter_list) != NULL) { | |
1728 | cl->filter_list = tp->next; | |
1729 | tcf_destroy(tp); | |
1730 | } | |
1731 | } | |
1732 | ||
1733 | static void cbq_destroy_class(struct Qdisc *sch, struct cbq_class *cl) | |
1734 | { | |
1735 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1736 | ||
1737 | BUG_TRAP(!cl->filters); | |
1738 | ||
1739 | cbq_destroy_filters(cl); | |
1740 | qdisc_destroy(cl->q); | |
1741 | qdisc_put_rtab(cl->R_tab); | |
1742 | #ifdef CONFIG_NET_ESTIMATOR | |
1743 | gen_kill_estimator(&cl->bstats, &cl->rate_est); | |
1744 | #endif | |
1745 | if (cl != &q->link) | |
1746 | kfree(cl); | |
1747 | } | |
1748 | ||
1749 | static void | |
1750 | cbq_destroy(struct Qdisc* sch) | |
1751 | { | |
1752 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1753 | struct cbq_class *cl; | |
1754 | unsigned h; | |
1755 | ||
1756 | #ifdef CONFIG_NET_CLS_POLICE | |
1757 | q->rx_class = NULL; | |
1758 | #endif | |
1759 | /* | |
1760 | * Filters must be destroyed first because we don't destroy the | |
1761 | * classes from root to leafs which means that filters can still | |
1762 | * be bound to classes which have been destroyed already. --TGR '04 | |
1763 | */ | |
1764 | for (h = 0; h < 16; h++) | |
1765 | for (cl = q->classes[h]; cl; cl = cl->next) | |
1766 | cbq_destroy_filters(cl); | |
1767 | ||
1768 | for (h = 0; h < 16; h++) { | |
1769 | struct cbq_class *next; | |
1770 | ||
1771 | for (cl = q->classes[h]; cl; cl = next) { | |
1772 | next = cl->next; | |
1773 | cbq_destroy_class(sch, cl); | |
1774 | } | |
1775 | } | |
1776 | } | |
1777 | ||
1778 | static void cbq_put(struct Qdisc *sch, unsigned long arg) | |
1779 | { | |
1780 | struct cbq_class *cl = (struct cbq_class*)arg; | |
1781 | ||
1782 | if (--cl->refcnt == 0) { | |
1783 | #ifdef CONFIG_NET_CLS_POLICE | |
1784 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1785 | ||
1786 | spin_lock_bh(&sch->dev->queue_lock); | |
1787 | if (q->rx_class == cl) | |
1788 | q->rx_class = NULL; | |
1789 | spin_unlock_bh(&sch->dev->queue_lock); | |
1790 | #endif | |
1791 | ||
1792 | cbq_destroy_class(sch, cl); | |
1793 | } | |
1794 | } | |
1795 | ||
1796 | static int | |
1797 | cbq_change_class(struct Qdisc *sch, u32 classid, u32 parentid, struct rtattr **tca, | |
1798 | unsigned long *arg) | |
1799 | { | |
1800 | int err; | |
1801 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1802 | struct cbq_class *cl = (struct cbq_class*)*arg; | |
1803 | struct rtattr *opt = tca[TCA_OPTIONS-1]; | |
1804 | struct rtattr *tb[TCA_CBQ_MAX]; | |
1805 | struct cbq_class *parent; | |
1806 | struct qdisc_rate_table *rtab = NULL; | |
1807 | ||
1808 | if (opt==NULL || rtattr_parse_nested(tb, TCA_CBQ_MAX, opt)) | |
1809 | return -EINVAL; | |
1810 | ||
1811 | if (tb[TCA_CBQ_OVL_STRATEGY-1] && | |
1812 | RTA_PAYLOAD(tb[TCA_CBQ_OVL_STRATEGY-1]) < sizeof(struct tc_cbq_ovl)) | |
1813 | return -EINVAL; | |
1814 | ||
1815 | if (tb[TCA_CBQ_FOPT-1] && | |
1816 | RTA_PAYLOAD(tb[TCA_CBQ_FOPT-1]) < sizeof(struct tc_cbq_fopt)) | |
1817 | return -EINVAL; | |
1818 | ||
1819 | if (tb[TCA_CBQ_RATE-1] && | |
1820 | RTA_PAYLOAD(tb[TCA_CBQ_RATE-1]) < sizeof(struct tc_ratespec)) | |
1821 | return -EINVAL; | |
1822 | ||
1823 | if (tb[TCA_CBQ_LSSOPT-1] && | |
1824 | RTA_PAYLOAD(tb[TCA_CBQ_LSSOPT-1]) < sizeof(struct tc_cbq_lssopt)) | |
1825 | return -EINVAL; | |
1826 | ||
1827 | if (tb[TCA_CBQ_WRROPT-1] && | |
1828 | RTA_PAYLOAD(tb[TCA_CBQ_WRROPT-1]) < sizeof(struct tc_cbq_wrropt)) | |
1829 | return -EINVAL; | |
1830 | ||
1831 | #ifdef CONFIG_NET_CLS_POLICE | |
1832 | if (tb[TCA_CBQ_POLICE-1] && | |
1833 | RTA_PAYLOAD(tb[TCA_CBQ_POLICE-1]) < sizeof(struct tc_cbq_police)) | |
1834 | return -EINVAL; | |
1835 | #endif | |
1836 | ||
1837 | if (cl) { | |
1838 | /* Check parent */ | |
1839 | if (parentid) { | |
1840 | if (cl->tparent && cl->tparent->classid != parentid) | |
1841 | return -EINVAL; | |
1842 | if (!cl->tparent && parentid != TC_H_ROOT) | |
1843 | return -EINVAL; | |
1844 | } | |
1845 | ||
1846 | if (tb[TCA_CBQ_RATE-1]) { | |
1847 | rtab = qdisc_get_rtab(RTA_DATA(tb[TCA_CBQ_RATE-1]), tb[TCA_CBQ_RTAB-1]); | |
1848 | if (rtab == NULL) | |
1849 | return -EINVAL; | |
1850 | } | |
1851 | ||
1852 | /* Change class parameters */ | |
1853 | sch_tree_lock(sch); | |
1854 | ||
1855 | if (cl->next_alive != NULL) | |
1856 | cbq_deactivate_class(cl); | |
1857 | ||
1858 | if (rtab) { | |
1859 | rtab = xchg(&cl->R_tab, rtab); | |
1860 | qdisc_put_rtab(rtab); | |
1861 | } | |
1862 | ||
1863 | if (tb[TCA_CBQ_LSSOPT-1]) | |
1864 | cbq_set_lss(cl, RTA_DATA(tb[TCA_CBQ_LSSOPT-1])); | |
1865 | ||
1866 | if (tb[TCA_CBQ_WRROPT-1]) { | |
1867 | cbq_rmprio(q, cl); | |
1868 | cbq_set_wrr(cl, RTA_DATA(tb[TCA_CBQ_WRROPT-1])); | |
1869 | } | |
1870 | ||
1871 | if (tb[TCA_CBQ_OVL_STRATEGY-1]) | |
1872 | cbq_set_overlimit(cl, RTA_DATA(tb[TCA_CBQ_OVL_STRATEGY-1])); | |
1873 | ||
1874 | #ifdef CONFIG_NET_CLS_POLICE | |
1875 | if (tb[TCA_CBQ_POLICE-1]) | |
1876 | cbq_set_police(cl, RTA_DATA(tb[TCA_CBQ_POLICE-1])); | |
1877 | #endif | |
1878 | ||
1879 | if (tb[TCA_CBQ_FOPT-1]) | |
1880 | cbq_set_fopt(cl, RTA_DATA(tb[TCA_CBQ_FOPT-1])); | |
1881 | ||
1882 | if (cl->q->q.qlen) | |
1883 | cbq_activate_class(cl); | |
1884 | ||
1885 | sch_tree_unlock(sch); | |
1886 | ||
1887 | #ifdef CONFIG_NET_ESTIMATOR | |
1888 | if (tca[TCA_RATE-1]) | |
1889 | gen_replace_estimator(&cl->bstats, &cl->rate_est, | |
1890 | cl->stats_lock, tca[TCA_RATE-1]); | |
1891 | #endif | |
1892 | return 0; | |
1893 | } | |
1894 | ||
1895 | if (parentid == TC_H_ROOT) | |
1896 | return -EINVAL; | |
1897 | ||
1898 | if (tb[TCA_CBQ_WRROPT-1] == NULL || tb[TCA_CBQ_RATE-1] == NULL || | |
1899 | tb[TCA_CBQ_LSSOPT-1] == NULL) | |
1900 | return -EINVAL; | |
1901 | ||
1902 | rtab = qdisc_get_rtab(RTA_DATA(tb[TCA_CBQ_RATE-1]), tb[TCA_CBQ_RTAB-1]); | |
1903 | if (rtab == NULL) | |
1904 | return -EINVAL; | |
1905 | ||
1906 | if (classid) { | |
1907 | err = -EINVAL; | |
1908 | if (TC_H_MAJ(classid^sch->handle) || cbq_class_lookup(q, classid)) | |
1909 | goto failure; | |
1910 | } else { | |
1911 | int i; | |
1912 | classid = TC_H_MAKE(sch->handle,0x8000); | |
1913 | ||
1914 | for (i=0; i<0x8000; i++) { | |
1915 | if (++q->hgenerator >= 0x8000) | |
1916 | q->hgenerator = 1; | |
1917 | if (cbq_class_lookup(q, classid|q->hgenerator) == NULL) | |
1918 | break; | |
1919 | } | |
1920 | err = -ENOSR; | |
1921 | if (i >= 0x8000) | |
1922 | goto failure; | |
1923 | classid = classid|q->hgenerator; | |
1924 | } | |
1925 | ||
1926 | parent = &q->link; | |
1927 | if (parentid) { | |
1928 | parent = cbq_class_lookup(q, parentid); | |
1929 | err = -EINVAL; | |
1930 | if (parent == NULL) | |
1931 | goto failure; | |
1932 | } | |
1933 | ||
1934 | err = -ENOBUFS; | |
0da974f4 | 1935 | cl = kzalloc(sizeof(*cl), GFP_KERNEL); |
1da177e4 LT |
1936 | if (cl == NULL) |
1937 | goto failure; | |
1da177e4 LT |
1938 | cl->R_tab = rtab; |
1939 | rtab = NULL; | |
1940 | cl->refcnt = 1; | |
9f9afec4 | 1941 | if (!(cl->q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops, classid))) |
1da177e4 LT |
1942 | cl->q = &noop_qdisc; |
1943 | cl->classid = classid; | |
1944 | cl->tparent = parent; | |
1945 | cl->qdisc = sch; | |
1946 | cl->allot = parent->allot; | |
1947 | cl->quantum = cl->allot; | |
1948 | cl->weight = cl->R_tab->rate.rate; | |
1949 | cl->stats_lock = &sch->dev->queue_lock; | |
1950 | ||
1951 | sch_tree_lock(sch); | |
1952 | cbq_link_class(cl); | |
1953 | cl->borrow = cl->tparent; | |
1954 | if (cl->tparent != &q->link) | |
1955 | cl->share = cl->tparent; | |
1956 | cbq_adjust_levels(parent); | |
1957 | cl->minidle = -0x7FFFFFFF; | |
1958 | cbq_set_lss(cl, RTA_DATA(tb[TCA_CBQ_LSSOPT-1])); | |
1959 | cbq_set_wrr(cl, RTA_DATA(tb[TCA_CBQ_WRROPT-1])); | |
1960 | if (cl->ewma_log==0) | |
1961 | cl->ewma_log = q->link.ewma_log; | |
1962 | if (cl->maxidle==0) | |
1963 | cl->maxidle = q->link.maxidle; | |
1964 | if (cl->avpkt==0) | |
1965 | cl->avpkt = q->link.avpkt; | |
1966 | cl->overlimit = cbq_ovl_classic; | |
1967 | if (tb[TCA_CBQ_OVL_STRATEGY-1]) | |
1968 | cbq_set_overlimit(cl, RTA_DATA(tb[TCA_CBQ_OVL_STRATEGY-1])); | |
1969 | #ifdef CONFIG_NET_CLS_POLICE | |
1970 | if (tb[TCA_CBQ_POLICE-1]) | |
1971 | cbq_set_police(cl, RTA_DATA(tb[TCA_CBQ_POLICE-1])); | |
1972 | #endif | |
1973 | if (tb[TCA_CBQ_FOPT-1]) | |
1974 | cbq_set_fopt(cl, RTA_DATA(tb[TCA_CBQ_FOPT-1])); | |
1975 | sch_tree_unlock(sch); | |
1976 | ||
1977 | #ifdef CONFIG_NET_ESTIMATOR | |
1978 | if (tca[TCA_RATE-1]) | |
1979 | gen_new_estimator(&cl->bstats, &cl->rate_est, | |
1980 | cl->stats_lock, tca[TCA_RATE-1]); | |
1981 | #endif | |
1982 | ||
1983 | *arg = (unsigned long)cl; | |
1984 | return 0; | |
1985 | ||
1986 | failure: | |
1987 | qdisc_put_rtab(rtab); | |
1988 | return err; | |
1989 | } | |
1990 | ||
1991 | static int cbq_delete(struct Qdisc *sch, unsigned long arg) | |
1992 | { | |
1993 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1994 | struct cbq_class *cl = (struct cbq_class*)arg; | |
a37ef2e3 | 1995 | unsigned int qlen; |
1da177e4 LT |
1996 | |
1997 | if (cl->filters || cl->children || cl == &q->link) | |
1998 | return -EBUSY; | |
1999 | ||
2000 | sch_tree_lock(sch); | |
2001 | ||
a37ef2e3 JP |
2002 | qlen = cl->q->q.qlen; |
2003 | qdisc_reset(cl->q); | |
2004 | qdisc_tree_decrease_qlen(cl->q, qlen); | |
2005 | ||
1da177e4 LT |
2006 | if (cl->next_alive) |
2007 | cbq_deactivate_class(cl); | |
2008 | ||
2009 | if (q->tx_borrowed == cl) | |
2010 | q->tx_borrowed = q->tx_class; | |
2011 | if (q->tx_class == cl) { | |
2012 | q->tx_class = NULL; | |
2013 | q->tx_borrowed = NULL; | |
2014 | } | |
2015 | #ifdef CONFIG_NET_CLS_POLICE | |
2016 | if (q->rx_class == cl) | |
2017 | q->rx_class = NULL; | |
2018 | #endif | |
2019 | ||
2020 | cbq_unlink_class(cl); | |
2021 | cbq_adjust_levels(cl->tparent); | |
2022 | cl->defmap = 0; | |
2023 | cbq_sync_defmap(cl); | |
2024 | ||
2025 | cbq_rmprio(q, cl); | |
2026 | sch_tree_unlock(sch); | |
2027 | ||
2028 | if (--cl->refcnt == 0) | |
2029 | cbq_destroy_class(sch, cl); | |
2030 | ||
2031 | return 0; | |
2032 | } | |
2033 | ||
2034 | static struct tcf_proto **cbq_find_tcf(struct Qdisc *sch, unsigned long arg) | |
2035 | { | |
2036 | struct cbq_sched_data *q = qdisc_priv(sch); | |
2037 | struct cbq_class *cl = (struct cbq_class *)arg; | |
2038 | ||
2039 | if (cl == NULL) | |
2040 | cl = &q->link; | |
2041 | ||
2042 | return &cl->filter_list; | |
2043 | } | |
2044 | ||
2045 | static unsigned long cbq_bind_filter(struct Qdisc *sch, unsigned long parent, | |
2046 | u32 classid) | |
2047 | { | |
2048 | struct cbq_sched_data *q = qdisc_priv(sch); | |
2049 | struct cbq_class *p = (struct cbq_class*)parent; | |
2050 | struct cbq_class *cl = cbq_class_lookup(q, classid); | |
2051 | ||
2052 | if (cl) { | |
2053 | if (p && p->level <= cl->level) | |
2054 | return 0; | |
2055 | cl->filters++; | |
2056 | return (unsigned long)cl; | |
2057 | } | |
2058 | return 0; | |
2059 | } | |
2060 | ||
2061 | static void cbq_unbind_filter(struct Qdisc *sch, unsigned long arg) | |
2062 | { | |
2063 | struct cbq_class *cl = (struct cbq_class*)arg; | |
2064 | ||
2065 | cl->filters--; | |
2066 | } | |
2067 | ||
2068 | static void cbq_walk(struct Qdisc *sch, struct qdisc_walker *arg) | |
2069 | { | |
2070 | struct cbq_sched_data *q = qdisc_priv(sch); | |
2071 | unsigned h; | |
2072 | ||
2073 | if (arg->stop) | |
2074 | return; | |
2075 | ||
2076 | for (h = 0; h < 16; h++) { | |
2077 | struct cbq_class *cl; | |
2078 | ||
2079 | for (cl = q->classes[h]; cl; cl = cl->next) { | |
2080 | if (arg->count < arg->skip) { | |
2081 | arg->count++; | |
2082 | continue; | |
2083 | } | |
2084 | if (arg->fn(sch, (unsigned long)cl, arg) < 0) { | |
2085 | arg->stop = 1; | |
2086 | return; | |
2087 | } | |
2088 | arg->count++; | |
2089 | } | |
2090 | } | |
2091 | } | |
2092 | ||
2093 | static struct Qdisc_class_ops cbq_class_ops = { | |
2094 | .graft = cbq_graft, | |
2095 | .leaf = cbq_leaf, | |
a37ef2e3 | 2096 | .qlen_notify = cbq_qlen_notify, |
1da177e4 LT |
2097 | .get = cbq_get, |
2098 | .put = cbq_put, | |
2099 | .change = cbq_change_class, | |
2100 | .delete = cbq_delete, | |
2101 | .walk = cbq_walk, | |
2102 | .tcf_chain = cbq_find_tcf, | |
2103 | .bind_tcf = cbq_bind_filter, | |
2104 | .unbind_tcf = cbq_unbind_filter, | |
2105 | .dump = cbq_dump_class, | |
2106 | .dump_stats = cbq_dump_class_stats, | |
2107 | }; | |
2108 | ||
2109 | static struct Qdisc_ops cbq_qdisc_ops = { | |
2110 | .next = NULL, | |
2111 | .cl_ops = &cbq_class_ops, | |
2112 | .id = "cbq", | |
2113 | .priv_size = sizeof(struct cbq_sched_data), | |
2114 | .enqueue = cbq_enqueue, | |
2115 | .dequeue = cbq_dequeue, | |
2116 | .requeue = cbq_requeue, | |
2117 | .drop = cbq_drop, | |
2118 | .init = cbq_init, | |
2119 | .reset = cbq_reset, | |
2120 | .destroy = cbq_destroy, | |
2121 | .change = NULL, | |
2122 | .dump = cbq_dump, | |
2123 | .dump_stats = cbq_dump_stats, | |
2124 | .owner = THIS_MODULE, | |
2125 | }; | |
2126 | ||
2127 | static int __init cbq_module_init(void) | |
2128 | { | |
2129 | return register_qdisc(&cbq_qdisc_ops); | |
2130 | } | |
10297b99 | 2131 | static void __exit cbq_module_exit(void) |
1da177e4 LT |
2132 | { |
2133 | unregister_qdisc(&cbq_qdisc_ops); | |
2134 | } | |
2135 | module_init(cbq_module_init) | |
2136 | module_exit(cbq_module_exit) | |
2137 | MODULE_LICENSE("GPL"); |