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1da177e4 LT |
1 | /* |
2 | * net/sched/sch_cbq.c Class-Based Queueing discipline. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
10 | * | |
11 | */ | |
12 | ||
1da177e4 | 13 | #include <linux/module.h> |
1da177e4 LT |
14 | #include <linux/types.h> |
15 | #include <linux/kernel.h> | |
1da177e4 | 16 | #include <linux/string.h> |
1da177e4 | 17 | #include <linux/errno.h> |
1da177e4 | 18 | #include <linux/skbuff.h> |
0ba48053 | 19 | #include <net/netlink.h> |
1da177e4 LT |
20 | #include <net/pkt_sched.h> |
21 | ||
22 | ||
23 | /* Class-Based Queueing (CBQ) algorithm. | |
24 | ======================================= | |
25 | ||
26 | Sources: [1] Sally Floyd and Van Jacobson, "Link-sharing and Resource | |
10297b99 | 27 | Management Models for Packet Networks", |
1da177e4 LT |
28 | IEEE/ACM Transactions on Networking, Vol.3, No.4, 1995 |
29 | ||
10297b99 | 30 | [2] Sally Floyd, "Notes on CBQ and Guaranteed Service", 1995 |
1da177e4 | 31 | |
10297b99 | 32 | [3] Sally Floyd, "Notes on Class-Based Queueing: Setting |
1da177e4 LT |
33 | Parameters", 1996 |
34 | ||
35 | [4] Sally Floyd and Michael Speer, "Experimental Results | |
36 | for Class-Based Queueing", 1998, not published. | |
37 | ||
38 | ----------------------------------------------------------------------- | |
39 | ||
40 | Algorithm skeleton was taken from NS simulator cbq.cc. | |
41 | If someone wants to check this code against the LBL version, | |
42 | he should take into account that ONLY the skeleton was borrowed, | |
43 | the implementation is different. Particularly: | |
44 | ||
45 | --- The WRR algorithm is different. Our version looks more | |
10297b99 YH |
46 | reasonable (I hope) and works when quanta are allowed to be |
47 | less than MTU, which is always the case when real time classes | |
48 | have small rates. Note, that the statement of [3] is | |
49 | incomplete, delay may actually be estimated even if class | |
50 | per-round allotment is less than MTU. Namely, if per-round | |
51 | allotment is W*r_i, and r_1+...+r_k = r < 1 | |
1da177e4 LT |
52 | |
53 | delay_i <= ([MTU/(W*r_i)]*W*r + W*r + k*MTU)/B | |
54 | ||
55 | In the worst case we have IntServ estimate with D = W*r+k*MTU | |
56 | and C = MTU*r. The proof (if correct at all) is trivial. | |
57 | ||
58 | ||
59 | --- It seems that cbq-2.0 is not very accurate. At least, I cannot | |
60 | interpret some places, which look like wrong translations | |
61 | from NS. Anyone is advised to find these differences | |
62 | and explain to me, why I am wrong 8). | |
63 | ||
64 | --- Linux has no EOI event, so that we cannot estimate true class | |
65 | idle time. Workaround is to consider the next dequeue event | |
66 | as sign that previous packet is finished. This is wrong because of | |
67 | internal device queueing, but on a permanently loaded link it is true. | |
68 | Moreover, combined with clock integrator, this scheme looks | |
69 | very close to an ideal solution. */ | |
70 | ||
71 | struct cbq_sched_data; | |
72 | ||
73 | ||
74 | struct cbq_class | |
75 | { | |
d77fea2e | 76 | struct Qdisc_class_common common; |
1da177e4 LT |
77 | struct cbq_class *next_alive; /* next class with backlog in this priority band */ |
78 | ||
79 | /* Parameters */ | |
1da177e4 LT |
80 | unsigned char priority; /* class priority */ |
81 | unsigned char priority2; /* priority to be used after overlimit */ | |
82 | unsigned char ewma_log; /* time constant for idle time calculation */ | |
83 | unsigned char ovl_strategy; | |
c3bc7cff | 84 | #ifdef CONFIG_NET_CLS_ACT |
1da177e4 LT |
85 | unsigned char police; |
86 | #endif | |
87 | ||
88 | u32 defmap; | |
89 | ||
90 | /* Link-sharing scheduler parameters */ | |
91 | long maxidle; /* Class parameters: see below. */ | |
92 | long offtime; | |
93 | long minidle; | |
94 | u32 avpkt; | |
95 | struct qdisc_rate_table *R_tab; | |
96 | ||
97 | /* Overlimit strategy parameters */ | |
98 | void (*overlimit)(struct cbq_class *cl); | |
1a13cb63 | 99 | psched_tdiff_t penalty; |
1da177e4 LT |
100 | |
101 | /* General scheduler (WRR) parameters */ | |
102 | long allot; | |
103 | long quantum; /* Allotment per WRR round */ | |
104 | long weight; /* Relative allotment: see below */ | |
105 | ||
106 | struct Qdisc *qdisc; /* Ptr to CBQ discipline */ | |
107 | struct cbq_class *split; /* Ptr to split node */ | |
108 | struct cbq_class *share; /* Ptr to LS parent in the class tree */ | |
109 | struct cbq_class *tparent; /* Ptr to tree parent in the class tree */ | |
110 | struct cbq_class *borrow; /* NULL if class is bandwidth limited; | |
111 | parent otherwise */ | |
112 | struct cbq_class *sibling; /* Sibling chain */ | |
113 | struct cbq_class *children; /* Pointer to children chain */ | |
114 | ||
115 | struct Qdisc *q; /* Elementary queueing discipline */ | |
116 | ||
117 | ||
118 | /* Variables */ | |
119 | unsigned char cpriority; /* Effective priority */ | |
120 | unsigned char delayed; | |
121 | unsigned char level; /* level of the class in hierarchy: | |
122 | 0 for leaf classes, and maximal | |
123 | level of children + 1 for nodes. | |
124 | */ | |
125 | ||
126 | psched_time_t last; /* Last end of service */ | |
127 | psched_time_t undertime; | |
128 | long avgidle; | |
129 | long deficit; /* Saved deficit for WRR */ | |
1a13cb63 | 130 | psched_time_t penalized; |
c1a8f1f1 | 131 | struct gnet_stats_basic_packed bstats; |
1da177e4 LT |
132 | struct gnet_stats_queue qstats; |
133 | struct gnet_stats_rate_est rate_est; | |
1da177e4 LT |
134 | struct tc_cbq_xstats xstats; |
135 | ||
136 | struct tcf_proto *filter_list; | |
137 | ||
138 | int refcnt; | |
139 | int filters; | |
140 | ||
141 | struct cbq_class *defaults[TC_PRIO_MAX+1]; | |
142 | }; | |
143 | ||
144 | struct cbq_sched_data | |
145 | { | |
d77fea2e | 146 | struct Qdisc_class_hash clhash; /* Hash table of all classes */ |
1da177e4 LT |
147 | int nclasses[TC_CBQ_MAXPRIO+1]; |
148 | unsigned quanta[TC_CBQ_MAXPRIO+1]; | |
149 | ||
150 | struct cbq_class link; | |
151 | ||
152 | unsigned activemask; | |
153 | struct cbq_class *active[TC_CBQ_MAXPRIO+1]; /* List of all classes | |
154 | with backlog */ | |
155 | ||
c3bc7cff | 156 | #ifdef CONFIG_NET_CLS_ACT |
1da177e4 LT |
157 | struct cbq_class *rx_class; |
158 | #endif | |
159 | struct cbq_class *tx_class; | |
160 | struct cbq_class *tx_borrowed; | |
161 | int tx_len; | |
162 | psched_time_t now; /* Cached timestamp */ | |
163 | psched_time_t now_rt; /* Cached real time */ | |
164 | unsigned pmask; | |
165 | ||
38acce2d | 166 | struct tasklet_hrtimer delay_timer; |
88a99354 | 167 | struct qdisc_watchdog watchdog; /* Watchdog timer, |
1da177e4 LT |
168 | started when CBQ has |
169 | backlog, but cannot | |
170 | transmit just now */ | |
88a99354 | 171 | psched_tdiff_t wd_expires; |
1da177e4 LT |
172 | int toplevel; |
173 | u32 hgenerator; | |
174 | }; | |
175 | ||
176 | ||
e9bef55d | 177 | #define L2T(cl,len) qdisc_l2t((cl)->R_tab,len) |
1da177e4 | 178 | |
1da177e4 LT |
179 | static __inline__ struct cbq_class * |
180 | cbq_class_lookup(struct cbq_sched_data *q, u32 classid) | |
181 | { | |
d77fea2e | 182 | struct Qdisc_class_common *clc; |
1da177e4 | 183 | |
d77fea2e PM |
184 | clc = qdisc_class_find(&q->clhash, classid); |
185 | if (clc == NULL) | |
186 | return NULL; | |
187 | return container_of(clc, struct cbq_class, common); | |
1da177e4 LT |
188 | } |
189 | ||
c3bc7cff | 190 | #ifdef CONFIG_NET_CLS_ACT |
1da177e4 LT |
191 | |
192 | static struct cbq_class * | |
193 | cbq_reclassify(struct sk_buff *skb, struct cbq_class *this) | |
194 | { | |
195 | struct cbq_class *cl, *new; | |
196 | ||
197 | for (cl = this->tparent; cl; cl = cl->tparent) | |
198 | if ((new = cl->defaults[TC_PRIO_BESTEFFORT]) != NULL && new != this) | |
199 | return new; | |
200 | ||
201 | return NULL; | |
202 | } | |
203 | ||
204 | #endif | |
205 | ||
206 | /* Classify packet. The procedure is pretty complicated, but | |
207 | it allows us to combine link sharing and priority scheduling | |
208 | transparently. | |
209 | ||
210 | Namely, you can put link sharing rules (f.e. route based) at root of CBQ, | |
211 | so that it resolves to split nodes. Then packets are classified | |
212 | by logical priority, or a more specific classifier may be attached | |
213 | to the split node. | |
214 | */ | |
215 | ||
216 | static struct cbq_class * | |
217 | cbq_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr) | |
218 | { | |
219 | struct cbq_sched_data *q = qdisc_priv(sch); | |
220 | struct cbq_class *head = &q->link; | |
221 | struct cbq_class **defmap; | |
222 | struct cbq_class *cl = NULL; | |
223 | u32 prio = skb->priority; | |
224 | struct tcf_result res; | |
225 | ||
226 | /* | |
227 | * Step 1. If skb->priority points to one of our classes, use it. | |
228 | */ | |
229 | if (TC_H_MAJ(prio^sch->handle) == 0 && | |
230 | (cl = cbq_class_lookup(q, prio)) != NULL) | |
231 | return cl; | |
232 | ||
c27f339a | 233 | *qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS; |
1da177e4 LT |
234 | for (;;) { |
235 | int result = 0; | |
236 | defmap = head->defaults; | |
237 | ||
238 | /* | |
239 | * Step 2+n. Apply classifier. | |
240 | */ | |
73ca4918 PM |
241 | if (!head->filter_list || |
242 | (result = tc_classify_compat(skb, head->filter_list, &res)) < 0) | |
1da177e4 LT |
243 | goto fallback; |
244 | ||
245 | if ((cl = (void*)res.class) == NULL) { | |
246 | if (TC_H_MAJ(res.classid)) | |
247 | cl = cbq_class_lookup(q, res.classid); | |
248 | else if ((cl = defmap[res.classid&TC_PRIO_MAX]) == NULL) | |
249 | cl = defmap[TC_PRIO_BESTEFFORT]; | |
250 | ||
251 | if (cl == NULL || cl->level >= head->level) | |
252 | goto fallback; | |
253 | } | |
254 | ||
255 | #ifdef CONFIG_NET_CLS_ACT | |
256 | switch (result) { | |
257 | case TC_ACT_QUEUED: | |
10297b99 | 258 | case TC_ACT_STOLEN: |
378a2f09 | 259 | *qerr = NET_XMIT_SUCCESS | __NET_XMIT_STOLEN; |
1da177e4 LT |
260 | case TC_ACT_SHOT: |
261 | return NULL; | |
73ca4918 PM |
262 | case TC_ACT_RECLASSIFY: |
263 | return cbq_reclassify(skb, cl); | |
1da177e4 | 264 | } |
1da177e4 LT |
265 | #endif |
266 | if (cl->level == 0) | |
267 | return cl; | |
268 | ||
269 | /* | |
270 | * Step 3+n. If classifier selected a link sharing class, | |
271 | * apply agency specific classifier. | |
272 | * Repeat this procdure until we hit a leaf node. | |
273 | */ | |
274 | head = cl; | |
275 | } | |
276 | ||
277 | fallback: | |
278 | cl = head; | |
279 | ||
280 | /* | |
281 | * Step 4. No success... | |
282 | */ | |
283 | if (TC_H_MAJ(prio) == 0 && | |
284 | !(cl = head->defaults[prio&TC_PRIO_MAX]) && | |
285 | !(cl = head->defaults[TC_PRIO_BESTEFFORT])) | |
286 | return head; | |
287 | ||
288 | return cl; | |
289 | } | |
290 | ||
291 | /* | |
292 | A packet has just been enqueued on the empty class. | |
293 | cbq_activate_class adds it to the tail of active class list | |
294 | of its priority band. | |
295 | */ | |
296 | ||
297 | static __inline__ void cbq_activate_class(struct cbq_class *cl) | |
298 | { | |
299 | struct cbq_sched_data *q = qdisc_priv(cl->qdisc); | |
300 | int prio = cl->cpriority; | |
301 | struct cbq_class *cl_tail; | |
302 | ||
303 | cl_tail = q->active[prio]; | |
304 | q->active[prio] = cl; | |
305 | ||
306 | if (cl_tail != NULL) { | |
307 | cl->next_alive = cl_tail->next_alive; | |
308 | cl_tail->next_alive = cl; | |
309 | } else { | |
310 | cl->next_alive = cl; | |
311 | q->activemask |= (1<<prio); | |
312 | } | |
313 | } | |
314 | ||
315 | /* | |
316 | Unlink class from active chain. | |
317 | Note that this same procedure is done directly in cbq_dequeue* | |
318 | during round-robin procedure. | |
319 | */ | |
320 | ||
321 | static void cbq_deactivate_class(struct cbq_class *this) | |
322 | { | |
323 | struct cbq_sched_data *q = qdisc_priv(this->qdisc); | |
324 | int prio = this->cpriority; | |
325 | struct cbq_class *cl; | |
326 | struct cbq_class *cl_prev = q->active[prio]; | |
327 | ||
328 | do { | |
329 | cl = cl_prev->next_alive; | |
330 | if (cl == this) { | |
331 | cl_prev->next_alive = cl->next_alive; | |
332 | cl->next_alive = NULL; | |
333 | ||
334 | if (cl == q->active[prio]) { | |
335 | q->active[prio] = cl_prev; | |
336 | if (cl == q->active[prio]) { | |
337 | q->active[prio] = NULL; | |
338 | q->activemask &= ~(1<<prio); | |
339 | return; | |
340 | } | |
341 | } | |
1da177e4 LT |
342 | return; |
343 | } | |
344 | } while ((cl_prev = cl) != q->active[prio]); | |
345 | } | |
346 | ||
347 | static void | |
348 | cbq_mark_toplevel(struct cbq_sched_data *q, struct cbq_class *cl) | |
349 | { | |
350 | int toplevel = q->toplevel; | |
351 | ||
352 | if (toplevel > cl->level && !(cl->q->flags&TCQ_F_THROTTLED)) { | |
353 | psched_time_t now; | |
354 | psched_tdiff_t incr; | |
355 | ||
3bebcda2 | 356 | now = psched_get_time(); |
8edc0c31 | 357 | incr = now - q->now_rt; |
7c59e25f | 358 | now = q->now + incr; |
1da177e4 LT |
359 | |
360 | do { | |
104e0878 | 361 | if (cl->undertime < now) { |
1da177e4 LT |
362 | q->toplevel = cl->level; |
363 | return; | |
364 | } | |
365 | } while ((cl=cl->borrow) != NULL && toplevel > cl->level); | |
366 | } | |
367 | } | |
368 | ||
369 | static int | |
370 | cbq_enqueue(struct sk_buff *skb, struct Qdisc *sch) | |
371 | { | |
372 | struct cbq_sched_data *q = qdisc_priv(sch); | |
ddeee3ce | 373 | int uninitialized_var(ret); |
1da177e4 LT |
374 | struct cbq_class *cl = cbq_classify(skb, sch, &ret); |
375 | ||
c3bc7cff | 376 | #ifdef CONFIG_NET_CLS_ACT |
1da177e4 LT |
377 | q->rx_class = cl; |
378 | #endif | |
379 | if (cl == NULL) { | |
c27f339a | 380 | if (ret & __NET_XMIT_BYPASS) |
1da177e4 LT |
381 | sch->qstats.drops++; |
382 | kfree_skb(skb); | |
383 | return ret; | |
384 | } | |
385 | ||
c3bc7cff | 386 | #ifdef CONFIG_NET_CLS_ACT |
1da177e4 LT |
387 | cl->q->__parent = sch; |
388 | #endif | |
5f86173b JK |
389 | ret = qdisc_enqueue(skb, cl->q); |
390 | if (ret == NET_XMIT_SUCCESS) { | |
1da177e4 LT |
391 | sch->q.qlen++; |
392 | sch->bstats.packets++; | |
0abf77e5 | 393 | sch->bstats.bytes += qdisc_pkt_len(skb); |
1da177e4 LT |
394 | cbq_mark_toplevel(q, cl); |
395 | if (!cl->next_alive) | |
396 | cbq_activate_class(cl); | |
397 | return ret; | |
398 | } | |
399 | ||
378a2f09 JP |
400 | if (net_xmit_drop_count(ret)) { |
401 | sch->qstats.drops++; | |
402 | cbq_mark_toplevel(q, cl); | |
403 | cl->qstats.drops++; | |
404 | } | |
1da177e4 LT |
405 | return ret; |
406 | } | |
407 | ||
1da177e4 LT |
408 | /* Overlimit actions */ |
409 | ||
410 | /* TC_CBQ_OVL_CLASSIC: (default) penalize leaf class by adding offtime */ | |
411 | ||
412 | static void cbq_ovl_classic(struct cbq_class *cl) | |
413 | { | |
414 | struct cbq_sched_data *q = qdisc_priv(cl->qdisc); | |
8edc0c31 | 415 | psched_tdiff_t delay = cl->undertime - q->now; |
1da177e4 LT |
416 | |
417 | if (!cl->delayed) { | |
418 | delay += cl->offtime; | |
419 | ||
10297b99 | 420 | /* |
1da177e4 LT |
421 | Class goes to sleep, so that it will have no |
422 | chance to work avgidle. Let's forgive it 8) | |
423 | ||
424 | BTW cbq-2.0 has a crap in this | |
425 | place, apparently they forgot to shift it by cl->ewma_log. | |
426 | */ | |
427 | if (cl->avgidle < 0) | |
428 | delay -= (-cl->avgidle) - ((-cl->avgidle) >> cl->ewma_log); | |
429 | if (cl->avgidle < cl->minidle) | |
430 | cl->avgidle = cl->minidle; | |
431 | if (delay <= 0) | |
432 | delay = 1; | |
7c59e25f | 433 | cl->undertime = q->now + delay; |
1da177e4 LT |
434 | |
435 | cl->xstats.overactions++; | |
436 | cl->delayed = 1; | |
437 | } | |
438 | if (q->wd_expires == 0 || q->wd_expires > delay) | |
439 | q->wd_expires = delay; | |
440 | ||
441 | /* Dirty work! We must schedule wakeups based on | |
442 | real available rate, rather than leaf rate, | |
443 | which may be tiny (even zero). | |
444 | */ | |
445 | if (q->toplevel == TC_CBQ_MAXLEVEL) { | |
446 | struct cbq_class *b; | |
447 | psched_tdiff_t base_delay = q->wd_expires; | |
448 | ||
449 | for (b = cl->borrow; b; b = b->borrow) { | |
8edc0c31 | 450 | delay = b->undertime - q->now; |
1da177e4 LT |
451 | if (delay < base_delay) { |
452 | if (delay <= 0) | |
453 | delay = 1; | |
454 | base_delay = delay; | |
455 | } | |
456 | } | |
457 | ||
458 | q->wd_expires = base_delay; | |
459 | } | |
460 | } | |
461 | ||
462 | /* TC_CBQ_OVL_RCLASSIC: penalize by offtime classes in hierarchy, when | |
463 | they go overlimit | |
464 | */ | |
465 | ||
466 | static void cbq_ovl_rclassic(struct cbq_class *cl) | |
467 | { | |
468 | struct cbq_sched_data *q = qdisc_priv(cl->qdisc); | |
469 | struct cbq_class *this = cl; | |
470 | ||
471 | do { | |
472 | if (cl->level > q->toplevel) { | |
473 | cl = NULL; | |
474 | break; | |
475 | } | |
476 | } while ((cl = cl->borrow) != NULL); | |
477 | ||
478 | if (cl == NULL) | |
479 | cl = this; | |
480 | cbq_ovl_classic(cl); | |
481 | } | |
482 | ||
483 | /* TC_CBQ_OVL_DELAY: delay until it will go to underlimit */ | |
484 | ||
485 | static void cbq_ovl_delay(struct cbq_class *cl) | |
486 | { | |
487 | struct cbq_sched_data *q = qdisc_priv(cl->qdisc); | |
8edc0c31 | 488 | psched_tdiff_t delay = cl->undertime - q->now; |
1da177e4 | 489 | |
2540e051 JP |
490 | if (test_bit(__QDISC_STATE_DEACTIVATED, |
491 | &qdisc_root_sleeping(cl->qdisc)->state)) | |
492 | return; | |
493 | ||
1da177e4 | 494 | if (!cl->delayed) { |
1a13cb63 PM |
495 | psched_time_t sched = q->now; |
496 | ktime_t expires; | |
1da177e4 LT |
497 | |
498 | delay += cl->offtime; | |
499 | if (cl->avgidle < 0) | |
500 | delay -= (-cl->avgidle) - ((-cl->avgidle) >> cl->ewma_log); | |
501 | if (cl->avgidle < cl->minidle) | |
502 | cl->avgidle = cl->minidle; | |
7c59e25f | 503 | cl->undertime = q->now + delay; |
1da177e4 LT |
504 | |
505 | if (delay > 0) { | |
38acce2d DM |
506 | struct hrtimer *ht; |
507 | ||
1a13cb63 | 508 | sched += delay + cl->penalty; |
1da177e4 LT |
509 | cl->penalized = sched; |
510 | cl->cpriority = TC_CBQ_MAXPRIO; | |
511 | q->pmask |= (1<<TC_CBQ_MAXPRIO); | |
1a13cb63 PM |
512 | |
513 | expires = ktime_set(0, 0); | |
ca44d6e6 | 514 | expires = ktime_add_ns(expires, PSCHED_TICKS2NS(sched)); |
38acce2d DM |
515 | ht = &q->delay_timer.timer; |
516 | if (hrtimer_try_to_cancel(ht) && | |
517 | ktime_to_ns(ktime_sub(hrtimer_get_expires(ht), | |
518 | expires)) > 0) | |
519 | hrtimer_set_expires(ht, expires); | |
520 | hrtimer_restart(ht); | |
1da177e4 LT |
521 | cl->delayed = 1; |
522 | cl->xstats.overactions++; | |
523 | return; | |
524 | } | |
525 | delay = 1; | |
526 | } | |
527 | if (q->wd_expires == 0 || q->wd_expires > delay) | |
528 | q->wd_expires = delay; | |
529 | } | |
530 | ||
531 | /* TC_CBQ_OVL_LOWPRIO: penalize class by lowering its priority band */ | |
532 | ||
533 | static void cbq_ovl_lowprio(struct cbq_class *cl) | |
534 | { | |
535 | struct cbq_sched_data *q = qdisc_priv(cl->qdisc); | |
536 | ||
1a13cb63 | 537 | cl->penalized = q->now + cl->penalty; |
1da177e4 LT |
538 | |
539 | if (cl->cpriority != cl->priority2) { | |
540 | cl->cpriority = cl->priority2; | |
541 | q->pmask |= (1<<cl->cpriority); | |
542 | cl->xstats.overactions++; | |
543 | } | |
544 | cbq_ovl_classic(cl); | |
545 | } | |
546 | ||
547 | /* TC_CBQ_OVL_DROP: penalize class by dropping */ | |
548 | ||
549 | static void cbq_ovl_drop(struct cbq_class *cl) | |
550 | { | |
551 | if (cl->q->ops->drop) | |
552 | if (cl->q->ops->drop(cl->q)) | |
553 | cl->qdisc->q.qlen--; | |
554 | cl->xstats.overactions++; | |
555 | cbq_ovl_classic(cl); | |
556 | } | |
557 | ||
1a13cb63 PM |
558 | static psched_tdiff_t cbq_undelay_prio(struct cbq_sched_data *q, int prio, |
559 | psched_time_t now) | |
1da177e4 LT |
560 | { |
561 | struct cbq_class *cl; | |
562 | struct cbq_class *cl_prev = q->active[prio]; | |
1a13cb63 | 563 | psched_time_t sched = now; |
1da177e4 LT |
564 | |
565 | if (cl_prev == NULL) | |
e9054a33 | 566 | return 0; |
1da177e4 LT |
567 | |
568 | do { | |
569 | cl = cl_prev->next_alive; | |
1a13cb63 | 570 | if (now - cl->penalized > 0) { |
1da177e4 LT |
571 | cl_prev->next_alive = cl->next_alive; |
572 | cl->next_alive = NULL; | |
573 | cl->cpriority = cl->priority; | |
574 | cl->delayed = 0; | |
575 | cbq_activate_class(cl); | |
576 | ||
577 | if (cl == q->active[prio]) { | |
578 | q->active[prio] = cl_prev; | |
579 | if (cl == q->active[prio]) { | |
580 | q->active[prio] = NULL; | |
581 | return 0; | |
582 | } | |
583 | } | |
584 | ||
585 | cl = cl_prev->next_alive; | |
1a13cb63 | 586 | } else if (sched - cl->penalized > 0) |
1da177e4 LT |
587 | sched = cl->penalized; |
588 | } while ((cl_prev = cl) != q->active[prio]); | |
589 | ||
1a13cb63 | 590 | return sched - now; |
1da177e4 LT |
591 | } |
592 | ||
1a13cb63 | 593 | static enum hrtimer_restart cbq_undelay(struct hrtimer *timer) |
1da177e4 | 594 | { |
1a13cb63 | 595 | struct cbq_sched_data *q = container_of(timer, struct cbq_sched_data, |
a2cb6a4d | 596 | delay_timer.timer); |
1a13cb63 PM |
597 | struct Qdisc *sch = q->watchdog.qdisc; |
598 | psched_time_t now; | |
599 | psched_tdiff_t delay = 0; | |
1da177e4 LT |
600 | unsigned pmask; |
601 | ||
3bebcda2 | 602 | now = psched_get_time(); |
1a13cb63 | 603 | |
1da177e4 LT |
604 | pmask = q->pmask; |
605 | q->pmask = 0; | |
606 | ||
607 | while (pmask) { | |
608 | int prio = ffz(~pmask); | |
1a13cb63 | 609 | psched_tdiff_t tmp; |
1da177e4 LT |
610 | |
611 | pmask &= ~(1<<prio); | |
612 | ||
1a13cb63 | 613 | tmp = cbq_undelay_prio(q, prio, now); |
1da177e4 LT |
614 | if (tmp > 0) { |
615 | q->pmask |= 1<<prio; | |
616 | if (tmp < delay || delay == 0) | |
617 | delay = tmp; | |
618 | } | |
619 | } | |
620 | ||
621 | if (delay) { | |
1a13cb63 PM |
622 | ktime_t time; |
623 | ||
624 | time = ktime_set(0, 0); | |
ca44d6e6 | 625 | time = ktime_add_ns(time, PSCHED_TICKS2NS(now + delay)); |
38acce2d | 626 | tasklet_hrtimer_start(&q->delay_timer, time, HRTIMER_MODE_ABS); |
1da177e4 LT |
627 | } |
628 | ||
629 | sch->flags &= ~TCQ_F_THROTTLED; | |
8608db03 | 630 | __netif_schedule(qdisc_root(sch)); |
1a13cb63 | 631 | return HRTIMER_NORESTART; |
1da177e4 LT |
632 | } |
633 | ||
c3bc7cff | 634 | #ifdef CONFIG_NET_CLS_ACT |
1da177e4 LT |
635 | static int cbq_reshape_fail(struct sk_buff *skb, struct Qdisc *child) |
636 | { | |
1da177e4 LT |
637 | struct Qdisc *sch = child->__parent; |
638 | struct cbq_sched_data *q = qdisc_priv(sch); | |
639 | struct cbq_class *cl = q->rx_class; | |
640 | ||
641 | q->rx_class = NULL; | |
642 | ||
643 | if (cl && (cl = cbq_reclassify(skb, cl)) != NULL) { | |
378a2f09 | 644 | int ret; |
1da177e4 LT |
645 | |
646 | cbq_mark_toplevel(q, cl); | |
647 | ||
648 | q->rx_class = cl; | |
649 | cl->q->__parent = sch; | |
650 | ||
378a2f09 JP |
651 | ret = qdisc_enqueue(skb, cl->q); |
652 | if (ret == NET_XMIT_SUCCESS) { | |
1da177e4 LT |
653 | sch->q.qlen++; |
654 | sch->bstats.packets++; | |
0abf77e5 | 655 | sch->bstats.bytes += qdisc_pkt_len(skb); |
1da177e4 LT |
656 | if (!cl->next_alive) |
657 | cbq_activate_class(cl); | |
658 | return 0; | |
659 | } | |
378a2f09 JP |
660 | if (net_xmit_drop_count(ret)) |
661 | sch->qstats.drops++; | |
1da177e4 LT |
662 | return 0; |
663 | } | |
664 | ||
665 | sch->qstats.drops++; | |
666 | return -1; | |
667 | } | |
668 | #endif | |
669 | ||
10297b99 | 670 | /* |
1da177e4 LT |
671 | It is mission critical procedure. |
672 | ||
673 | We "regenerate" toplevel cutoff, if transmitting class | |
674 | has backlog and it is not regulated. It is not part of | |
675 | original CBQ description, but looks more reasonable. | |
676 | Probably, it is wrong. This question needs further investigation. | |
677 | */ | |
678 | ||
679 | static __inline__ void | |
680 | cbq_update_toplevel(struct cbq_sched_data *q, struct cbq_class *cl, | |
681 | struct cbq_class *borrowed) | |
682 | { | |
683 | if (cl && q->toplevel >= borrowed->level) { | |
684 | if (cl->q->q.qlen > 1) { | |
685 | do { | |
a084980d | 686 | if (borrowed->undertime == PSCHED_PASTPERFECT) { |
1da177e4 LT |
687 | q->toplevel = borrowed->level; |
688 | return; | |
689 | } | |
690 | } while ((borrowed=borrowed->borrow) != NULL); | |
691 | } | |
10297b99 | 692 | #if 0 |
1da177e4 LT |
693 | /* It is not necessary now. Uncommenting it |
694 | will save CPU cycles, but decrease fairness. | |
695 | */ | |
696 | q->toplevel = TC_CBQ_MAXLEVEL; | |
697 | #endif | |
698 | } | |
699 | } | |
700 | ||
701 | static void | |
702 | cbq_update(struct cbq_sched_data *q) | |
703 | { | |
704 | struct cbq_class *this = q->tx_class; | |
705 | struct cbq_class *cl = this; | |
706 | int len = q->tx_len; | |
707 | ||
708 | q->tx_class = NULL; | |
709 | ||
710 | for ( ; cl; cl = cl->share) { | |
711 | long avgidle = cl->avgidle; | |
712 | long idle; | |
713 | ||
714 | cl->bstats.packets++; | |
715 | cl->bstats.bytes += len; | |
716 | ||
717 | /* | |
718 | (now - last) is total time between packet right edges. | |
719 | (last_pktlen/rate) is "virtual" busy time, so that | |
720 | ||
10297b99 | 721 | idle = (now - last) - last_pktlen/rate |
1da177e4 LT |
722 | */ |
723 | ||
8edc0c31 | 724 | idle = q->now - cl->last; |
1da177e4 LT |
725 | if ((unsigned long)idle > 128*1024*1024) { |
726 | avgidle = cl->maxidle; | |
727 | } else { | |
728 | idle -= L2T(cl, len); | |
729 | ||
730 | /* true_avgidle := (1-W)*true_avgidle + W*idle, | |
731 | where W=2^{-ewma_log}. But cl->avgidle is scaled: | |
732 | cl->avgidle == true_avgidle/W, | |
733 | hence: | |
734 | */ | |
735 | avgidle += idle - (avgidle>>cl->ewma_log); | |
736 | } | |
737 | ||
738 | if (avgidle <= 0) { | |
739 | /* Overlimit or at-limit */ | |
740 | ||
741 | if (avgidle < cl->minidle) | |
742 | avgidle = cl->minidle; | |
743 | ||
744 | cl->avgidle = avgidle; | |
745 | ||
746 | /* Calculate expected time, when this class | |
747 | will be allowed to send. | |
748 | It will occur, when: | |
749 | (1-W)*true_avgidle + W*delay = 0, i.e. | |
750 | idle = (1/W - 1)*(-true_avgidle) | |
751 | or | |
752 | idle = (1 - W)*(-cl->avgidle); | |
753 | */ | |
754 | idle = (-avgidle) - ((-avgidle) >> cl->ewma_log); | |
755 | ||
756 | /* | |
757 | That is not all. | |
758 | To maintain the rate allocated to the class, | |
759 | we add to undertime virtual clock, | |
760 | necessary to complete transmitted packet. | |
761 | (len/phys_bandwidth has been already passed | |
762 | to the moment of cbq_update) | |
763 | */ | |
764 | ||
765 | idle -= L2T(&q->link, len); | |
766 | idle += L2T(cl, len); | |
767 | ||
7c59e25f | 768 | cl->undertime = q->now + idle; |
1da177e4 LT |
769 | } else { |
770 | /* Underlimit */ | |
771 | ||
a084980d | 772 | cl->undertime = PSCHED_PASTPERFECT; |
1da177e4 LT |
773 | if (avgidle > cl->maxidle) |
774 | cl->avgidle = cl->maxidle; | |
775 | else | |
776 | cl->avgidle = avgidle; | |
777 | } | |
778 | cl->last = q->now; | |
779 | } | |
780 | ||
781 | cbq_update_toplevel(q, this, q->tx_borrowed); | |
782 | } | |
783 | ||
784 | static __inline__ struct cbq_class * | |
785 | cbq_under_limit(struct cbq_class *cl) | |
786 | { | |
787 | struct cbq_sched_data *q = qdisc_priv(cl->qdisc); | |
788 | struct cbq_class *this_cl = cl; | |
789 | ||
790 | if (cl->tparent == NULL) | |
791 | return cl; | |
792 | ||
a084980d | 793 | if (cl->undertime == PSCHED_PASTPERFECT || q->now >= cl->undertime) { |
1da177e4 LT |
794 | cl->delayed = 0; |
795 | return cl; | |
796 | } | |
797 | ||
798 | do { | |
799 | /* It is very suspicious place. Now overlimit | |
800 | action is generated for not bounded classes | |
801 | only if link is completely congested. | |
802 | Though it is in agree with ancestor-only paradigm, | |
803 | it looks very stupid. Particularly, | |
804 | it means that this chunk of code will either | |
805 | never be called or result in strong amplification | |
806 | of burstiness. Dangerous, silly, and, however, | |
807 | no another solution exists. | |
808 | */ | |
809 | if ((cl = cl->borrow) == NULL) { | |
810 | this_cl->qstats.overlimits++; | |
811 | this_cl->overlimit(this_cl); | |
812 | return NULL; | |
813 | } | |
814 | if (cl->level > q->toplevel) | |
815 | return NULL; | |
a084980d | 816 | } while (cl->undertime != PSCHED_PASTPERFECT && q->now < cl->undertime); |
1da177e4 LT |
817 | |
818 | cl->delayed = 0; | |
819 | return cl; | |
820 | } | |
821 | ||
822 | static __inline__ struct sk_buff * | |
823 | cbq_dequeue_prio(struct Qdisc *sch, int prio) | |
824 | { | |
825 | struct cbq_sched_data *q = qdisc_priv(sch); | |
826 | struct cbq_class *cl_tail, *cl_prev, *cl; | |
827 | struct sk_buff *skb; | |
828 | int deficit; | |
829 | ||
830 | cl_tail = cl_prev = q->active[prio]; | |
831 | cl = cl_prev->next_alive; | |
832 | ||
833 | do { | |
834 | deficit = 0; | |
835 | ||
836 | /* Start round */ | |
837 | do { | |
838 | struct cbq_class *borrow = cl; | |
839 | ||
840 | if (cl->q->q.qlen && | |
841 | (borrow = cbq_under_limit(cl)) == NULL) | |
842 | goto skip_class; | |
843 | ||
844 | if (cl->deficit <= 0) { | |
845 | /* Class exhausted its allotment per | |
846 | this round. Switch to the next one. | |
847 | */ | |
848 | deficit = 1; | |
849 | cl->deficit += cl->quantum; | |
850 | goto next_class; | |
851 | } | |
852 | ||
853 | skb = cl->q->dequeue(cl->q); | |
854 | ||
855 | /* Class did not give us any skb :-( | |
10297b99 | 856 | It could occur even if cl->q->q.qlen != 0 |
1da177e4 LT |
857 | f.e. if cl->q == "tbf" |
858 | */ | |
859 | if (skb == NULL) | |
860 | goto skip_class; | |
861 | ||
0abf77e5 | 862 | cl->deficit -= qdisc_pkt_len(skb); |
1da177e4 LT |
863 | q->tx_class = cl; |
864 | q->tx_borrowed = borrow; | |
865 | if (borrow != cl) { | |
866 | #ifndef CBQ_XSTATS_BORROWS_BYTES | |
867 | borrow->xstats.borrows++; | |
868 | cl->xstats.borrows++; | |
869 | #else | |
0abf77e5 JK |
870 | borrow->xstats.borrows += qdisc_pkt_len(skb); |
871 | cl->xstats.borrows += qdisc_pkt_len(skb); | |
1da177e4 LT |
872 | #endif |
873 | } | |
0abf77e5 | 874 | q->tx_len = qdisc_pkt_len(skb); |
1da177e4 LT |
875 | |
876 | if (cl->deficit <= 0) { | |
877 | q->active[prio] = cl; | |
878 | cl = cl->next_alive; | |
879 | cl->deficit += cl->quantum; | |
880 | } | |
881 | return skb; | |
882 | ||
883 | skip_class: | |
884 | if (cl->q->q.qlen == 0 || prio != cl->cpriority) { | |
885 | /* Class is empty or penalized. | |
886 | Unlink it from active chain. | |
887 | */ | |
888 | cl_prev->next_alive = cl->next_alive; | |
889 | cl->next_alive = NULL; | |
890 | ||
891 | /* Did cl_tail point to it? */ | |
892 | if (cl == cl_tail) { | |
893 | /* Repair it! */ | |
894 | cl_tail = cl_prev; | |
895 | ||
896 | /* Was it the last class in this band? */ | |
897 | if (cl == cl_tail) { | |
898 | /* Kill the band! */ | |
899 | q->active[prio] = NULL; | |
900 | q->activemask &= ~(1<<prio); | |
901 | if (cl->q->q.qlen) | |
902 | cbq_activate_class(cl); | |
903 | return NULL; | |
904 | } | |
905 | ||
906 | q->active[prio] = cl_tail; | |
907 | } | |
908 | if (cl->q->q.qlen) | |
909 | cbq_activate_class(cl); | |
910 | ||
911 | cl = cl_prev; | |
912 | } | |
913 | ||
914 | next_class: | |
915 | cl_prev = cl; | |
916 | cl = cl->next_alive; | |
917 | } while (cl_prev != cl_tail); | |
918 | } while (deficit); | |
919 | ||
920 | q->active[prio] = cl_prev; | |
921 | ||
922 | return NULL; | |
923 | } | |
924 | ||
925 | static __inline__ struct sk_buff * | |
926 | cbq_dequeue_1(struct Qdisc *sch) | |
927 | { | |
928 | struct cbq_sched_data *q = qdisc_priv(sch); | |
929 | struct sk_buff *skb; | |
930 | unsigned activemask; | |
931 | ||
932 | activemask = q->activemask&0xFF; | |
933 | while (activemask) { | |
934 | int prio = ffz(~activemask); | |
935 | activemask &= ~(1<<prio); | |
936 | skb = cbq_dequeue_prio(sch, prio); | |
937 | if (skb) | |
938 | return skb; | |
939 | } | |
940 | return NULL; | |
941 | } | |
942 | ||
943 | static struct sk_buff * | |
944 | cbq_dequeue(struct Qdisc *sch) | |
945 | { | |
946 | struct sk_buff *skb; | |
947 | struct cbq_sched_data *q = qdisc_priv(sch); | |
948 | psched_time_t now; | |
949 | psched_tdiff_t incr; | |
950 | ||
3bebcda2 | 951 | now = psched_get_time(); |
8edc0c31 | 952 | incr = now - q->now_rt; |
1da177e4 LT |
953 | |
954 | if (q->tx_class) { | |
955 | psched_tdiff_t incr2; | |
956 | /* Time integrator. We calculate EOS time | |
957 | by adding expected packet transmission time. | |
958 | If real time is greater, we warp artificial clock, | |
959 | so that: | |
960 | ||
961 | cbq_time = max(real_time, work); | |
962 | */ | |
963 | incr2 = L2T(&q->link, q->tx_len); | |
7c59e25f | 964 | q->now += incr2; |
1da177e4 LT |
965 | cbq_update(q); |
966 | if ((incr -= incr2) < 0) | |
967 | incr = 0; | |
968 | } | |
7c59e25f | 969 | q->now += incr; |
1da177e4 LT |
970 | q->now_rt = now; |
971 | ||
972 | for (;;) { | |
973 | q->wd_expires = 0; | |
974 | ||
975 | skb = cbq_dequeue_1(sch); | |
976 | if (skb) { | |
977 | sch->q.qlen--; | |
978 | sch->flags &= ~TCQ_F_THROTTLED; | |
979 | return skb; | |
980 | } | |
981 | ||
982 | /* All the classes are overlimit. | |
983 | ||
984 | It is possible, if: | |
985 | ||
986 | 1. Scheduler is empty. | |
987 | 2. Toplevel cutoff inhibited borrowing. | |
988 | 3. Root class is overlimit. | |
989 | ||
990 | Reset 2d and 3d conditions and retry. | |
991 | ||
992 | Note, that NS and cbq-2.0 are buggy, peeking | |
993 | an arbitrary class is appropriate for ancestor-only | |
994 | sharing, but not for toplevel algorithm. | |
995 | ||
996 | Our version is better, but slower, because it requires | |
997 | two passes, but it is unavoidable with top-level sharing. | |
998 | */ | |
999 | ||
1000 | if (q->toplevel == TC_CBQ_MAXLEVEL && | |
a084980d | 1001 | q->link.undertime == PSCHED_PASTPERFECT) |
1da177e4 LT |
1002 | break; |
1003 | ||
1004 | q->toplevel = TC_CBQ_MAXLEVEL; | |
a084980d | 1005 | q->link.undertime = PSCHED_PASTPERFECT; |
1da177e4 LT |
1006 | } |
1007 | ||
1008 | /* No packets in scheduler or nobody wants to give them to us :-( | |
1009 | Sigh... start watchdog timer in the last case. */ | |
1010 | ||
1011 | if (sch->q.qlen) { | |
1012 | sch->qstats.overlimits++; | |
88a99354 PM |
1013 | if (q->wd_expires) |
1014 | qdisc_watchdog_schedule(&q->watchdog, | |
bb239acf | 1015 | now + q->wd_expires); |
1da177e4 LT |
1016 | } |
1017 | return NULL; | |
1018 | } | |
1019 | ||
1020 | /* CBQ class maintanance routines */ | |
1021 | ||
1022 | static void cbq_adjust_levels(struct cbq_class *this) | |
1023 | { | |
1024 | if (this == NULL) | |
1025 | return; | |
1026 | ||
1027 | do { | |
1028 | int level = 0; | |
1029 | struct cbq_class *cl; | |
1030 | ||
1031 | if ((cl = this->children) != NULL) { | |
1032 | do { | |
1033 | if (cl->level > level) | |
1034 | level = cl->level; | |
1035 | } while ((cl = cl->sibling) != this->children); | |
1036 | } | |
1037 | this->level = level+1; | |
1038 | } while ((this = this->tparent) != NULL); | |
1039 | } | |
1040 | ||
1041 | static void cbq_normalize_quanta(struct cbq_sched_data *q, int prio) | |
1042 | { | |
1043 | struct cbq_class *cl; | |
d77fea2e PM |
1044 | struct hlist_node *n; |
1045 | unsigned int h; | |
1da177e4 LT |
1046 | |
1047 | if (q->quanta[prio] == 0) | |
1048 | return; | |
1049 | ||
d77fea2e PM |
1050 | for (h = 0; h < q->clhash.hashsize; h++) { |
1051 | hlist_for_each_entry(cl, n, &q->clhash.hash[h], common.hnode) { | |
1da177e4 LT |
1052 | /* BUGGGG... Beware! This expression suffer of |
1053 | arithmetic overflows! | |
1054 | */ | |
1055 | if (cl->priority == prio) { | |
1056 | cl->quantum = (cl->weight*cl->allot*q->nclasses[prio])/ | |
1057 | q->quanta[prio]; | |
1058 | } | |
5ce2d488 | 1059 | if (cl->quantum <= 0 || cl->quantum>32*qdisc_dev(cl->qdisc)->mtu) { |
d77fea2e | 1060 | printk(KERN_WARNING "CBQ: class %08x has bad quantum==%ld, repaired.\n", cl->common.classid, cl->quantum); |
5ce2d488 | 1061 | cl->quantum = qdisc_dev(cl->qdisc)->mtu/2 + 1; |
1da177e4 LT |
1062 | } |
1063 | } | |
1064 | } | |
1065 | } | |
1066 | ||
1067 | static void cbq_sync_defmap(struct cbq_class *cl) | |
1068 | { | |
1069 | struct cbq_sched_data *q = qdisc_priv(cl->qdisc); | |
1070 | struct cbq_class *split = cl->split; | |
1071 | unsigned h; | |
1072 | int i; | |
1073 | ||
1074 | if (split == NULL) | |
1075 | return; | |
1076 | ||
1077 | for (i=0; i<=TC_PRIO_MAX; i++) { | |
1078 | if (split->defaults[i] == cl && !(cl->defmap&(1<<i))) | |
1079 | split->defaults[i] = NULL; | |
1080 | } | |
1081 | ||
1082 | for (i=0; i<=TC_PRIO_MAX; i++) { | |
1083 | int level = split->level; | |
1084 | ||
1085 | if (split->defaults[i]) | |
1086 | continue; | |
1087 | ||
d77fea2e PM |
1088 | for (h = 0; h < q->clhash.hashsize; h++) { |
1089 | struct hlist_node *n; | |
1da177e4 LT |
1090 | struct cbq_class *c; |
1091 | ||
d77fea2e PM |
1092 | hlist_for_each_entry(c, n, &q->clhash.hash[h], |
1093 | common.hnode) { | |
1da177e4 LT |
1094 | if (c->split == split && c->level < level && |
1095 | c->defmap&(1<<i)) { | |
1096 | split->defaults[i] = c; | |
1097 | level = c->level; | |
1098 | } | |
1099 | } | |
1100 | } | |
1101 | } | |
1102 | } | |
1103 | ||
1104 | static void cbq_change_defmap(struct cbq_class *cl, u32 splitid, u32 def, u32 mask) | |
1105 | { | |
1106 | struct cbq_class *split = NULL; | |
1107 | ||
1108 | if (splitid == 0) { | |
1109 | if ((split = cl->split) == NULL) | |
1110 | return; | |
d77fea2e | 1111 | splitid = split->common.classid; |
1da177e4 LT |
1112 | } |
1113 | ||
d77fea2e | 1114 | if (split == NULL || split->common.classid != splitid) { |
1da177e4 | 1115 | for (split = cl->tparent; split; split = split->tparent) |
d77fea2e | 1116 | if (split->common.classid == splitid) |
1da177e4 LT |
1117 | break; |
1118 | } | |
1119 | ||
1120 | if (split == NULL) | |
1121 | return; | |
1122 | ||
1123 | if (cl->split != split) { | |
1124 | cl->defmap = 0; | |
1125 | cbq_sync_defmap(cl); | |
1126 | cl->split = split; | |
1127 | cl->defmap = def&mask; | |
1128 | } else | |
1129 | cl->defmap = (cl->defmap&~mask)|(def&mask); | |
1130 | ||
1131 | cbq_sync_defmap(cl); | |
1132 | } | |
1133 | ||
1134 | static void cbq_unlink_class(struct cbq_class *this) | |
1135 | { | |
1136 | struct cbq_class *cl, **clp; | |
1137 | struct cbq_sched_data *q = qdisc_priv(this->qdisc); | |
1138 | ||
d77fea2e | 1139 | qdisc_class_hash_remove(&q->clhash, &this->common); |
1da177e4 LT |
1140 | |
1141 | if (this->tparent) { | |
1142 | clp=&this->sibling; | |
1143 | cl = *clp; | |
1144 | do { | |
1145 | if (cl == this) { | |
1146 | *clp = cl->sibling; | |
1147 | break; | |
1148 | } | |
1149 | clp = &cl->sibling; | |
1150 | } while ((cl = *clp) != this->sibling); | |
1151 | ||
1152 | if (this->tparent->children == this) { | |
1153 | this->tparent->children = this->sibling; | |
1154 | if (this->sibling == this) | |
1155 | this->tparent->children = NULL; | |
1156 | } | |
1157 | } else { | |
547b792c | 1158 | WARN_ON(this->sibling != this); |
1da177e4 LT |
1159 | } |
1160 | } | |
1161 | ||
1162 | static void cbq_link_class(struct cbq_class *this) | |
1163 | { | |
1164 | struct cbq_sched_data *q = qdisc_priv(this->qdisc); | |
1da177e4 LT |
1165 | struct cbq_class *parent = this->tparent; |
1166 | ||
1167 | this->sibling = this; | |
d77fea2e | 1168 | qdisc_class_hash_insert(&q->clhash, &this->common); |
1da177e4 LT |
1169 | |
1170 | if (parent == NULL) | |
1171 | return; | |
1172 | ||
1173 | if (parent->children == NULL) { | |
1174 | parent->children = this; | |
1175 | } else { | |
1176 | this->sibling = parent->children->sibling; | |
1177 | parent->children->sibling = this; | |
1178 | } | |
1179 | } | |
1180 | ||
1181 | static unsigned int cbq_drop(struct Qdisc* sch) | |
1182 | { | |
1183 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1184 | struct cbq_class *cl, *cl_head; | |
1185 | int prio; | |
1186 | unsigned int len; | |
1187 | ||
1188 | for (prio = TC_CBQ_MAXPRIO; prio >= 0; prio--) { | |
1189 | if ((cl_head = q->active[prio]) == NULL) | |
1190 | continue; | |
1191 | ||
1192 | cl = cl_head; | |
1193 | do { | |
1194 | if (cl->q->ops->drop && (len = cl->q->ops->drop(cl->q))) { | |
1195 | sch->q.qlen--; | |
a37ef2e3 JP |
1196 | if (!cl->q->q.qlen) |
1197 | cbq_deactivate_class(cl); | |
1da177e4 LT |
1198 | return len; |
1199 | } | |
1200 | } while ((cl = cl->next_alive) != cl_head); | |
1201 | } | |
1202 | return 0; | |
1203 | } | |
1204 | ||
1205 | static void | |
1206 | cbq_reset(struct Qdisc* sch) | |
1207 | { | |
1208 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1209 | struct cbq_class *cl; | |
d77fea2e | 1210 | struct hlist_node *n; |
1da177e4 LT |
1211 | int prio; |
1212 | unsigned h; | |
1213 | ||
1214 | q->activemask = 0; | |
1215 | q->pmask = 0; | |
1216 | q->tx_class = NULL; | |
1217 | q->tx_borrowed = NULL; | |
88a99354 | 1218 | qdisc_watchdog_cancel(&q->watchdog); |
38acce2d | 1219 | tasklet_hrtimer_cancel(&q->delay_timer); |
1da177e4 | 1220 | q->toplevel = TC_CBQ_MAXLEVEL; |
3bebcda2 | 1221 | q->now = psched_get_time(); |
1da177e4 LT |
1222 | q->now_rt = q->now; |
1223 | ||
1224 | for (prio = 0; prio <= TC_CBQ_MAXPRIO; prio++) | |
1225 | q->active[prio] = NULL; | |
1226 | ||
d77fea2e PM |
1227 | for (h = 0; h < q->clhash.hashsize; h++) { |
1228 | hlist_for_each_entry(cl, n, &q->clhash.hash[h], common.hnode) { | |
1da177e4 LT |
1229 | qdisc_reset(cl->q); |
1230 | ||
1231 | cl->next_alive = NULL; | |
a084980d | 1232 | cl->undertime = PSCHED_PASTPERFECT; |
1da177e4 LT |
1233 | cl->avgidle = cl->maxidle; |
1234 | cl->deficit = cl->quantum; | |
1235 | cl->cpriority = cl->priority; | |
1236 | } | |
1237 | } | |
1238 | sch->q.qlen = 0; | |
1239 | } | |
1240 | ||
1241 | ||
1242 | static int cbq_set_lss(struct cbq_class *cl, struct tc_cbq_lssopt *lss) | |
1243 | { | |
1244 | if (lss->change&TCF_CBQ_LSS_FLAGS) { | |
1245 | cl->share = (lss->flags&TCF_CBQ_LSS_ISOLATED) ? NULL : cl->tparent; | |
1246 | cl->borrow = (lss->flags&TCF_CBQ_LSS_BOUNDED) ? NULL : cl->tparent; | |
1247 | } | |
1248 | if (lss->change&TCF_CBQ_LSS_EWMA) | |
1249 | cl->ewma_log = lss->ewma_log; | |
1250 | if (lss->change&TCF_CBQ_LSS_AVPKT) | |
1251 | cl->avpkt = lss->avpkt; | |
1252 | if (lss->change&TCF_CBQ_LSS_MINIDLE) | |
1253 | cl->minidle = -(long)lss->minidle; | |
1254 | if (lss->change&TCF_CBQ_LSS_MAXIDLE) { | |
1255 | cl->maxidle = lss->maxidle; | |
1256 | cl->avgidle = lss->maxidle; | |
1257 | } | |
1258 | if (lss->change&TCF_CBQ_LSS_OFFTIME) | |
1259 | cl->offtime = lss->offtime; | |
1260 | return 0; | |
1261 | } | |
1262 | ||
1263 | static void cbq_rmprio(struct cbq_sched_data *q, struct cbq_class *cl) | |
1264 | { | |
1265 | q->nclasses[cl->priority]--; | |
1266 | q->quanta[cl->priority] -= cl->weight; | |
1267 | cbq_normalize_quanta(q, cl->priority); | |
1268 | } | |
1269 | ||
1270 | static void cbq_addprio(struct cbq_sched_data *q, struct cbq_class *cl) | |
1271 | { | |
1272 | q->nclasses[cl->priority]++; | |
1273 | q->quanta[cl->priority] += cl->weight; | |
1274 | cbq_normalize_quanta(q, cl->priority); | |
1275 | } | |
1276 | ||
1277 | static int cbq_set_wrr(struct cbq_class *cl, struct tc_cbq_wrropt *wrr) | |
1278 | { | |
1279 | struct cbq_sched_data *q = qdisc_priv(cl->qdisc); | |
1280 | ||
1281 | if (wrr->allot) | |
1282 | cl->allot = wrr->allot; | |
1283 | if (wrr->weight) | |
1284 | cl->weight = wrr->weight; | |
1285 | if (wrr->priority) { | |
1286 | cl->priority = wrr->priority-1; | |
1287 | cl->cpriority = cl->priority; | |
1288 | if (cl->priority >= cl->priority2) | |
1289 | cl->priority2 = TC_CBQ_MAXPRIO-1; | |
1290 | } | |
1291 | ||
1292 | cbq_addprio(q, cl); | |
1293 | return 0; | |
1294 | } | |
1295 | ||
1296 | static int cbq_set_overlimit(struct cbq_class *cl, struct tc_cbq_ovl *ovl) | |
1297 | { | |
1298 | switch (ovl->strategy) { | |
1299 | case TC_CBQ_OVL_CLASSIC: | |
1300 | cl->overlimit = cbq_ovl_classic; | |
1301 | break; | |
1302 | case TC_CBQ_OVL_DELAY: | |
1303 | cl->overlimit = cbq_ovl_delay; | |
1304 | break; | |
1305 | case TC_CBQ_OVL_LOWPRIO: | |
1306 | if (ovl->priority2-1 >= TC_CBQ_MAXPRIO || | |
1307 | ovl->priority2-1 <= cl->priority) | |
1308 | return -EINVAL; | |
1309 | cl->priority2 = ovl->priority2-1; | |
1310 | cl->overlimit = cbq_ovl_lowprio; | |
1311 | break; | |
1312 | case TC_CBQ_OVL_DROP: | |
1313 | cl->overlimit = cbq_ovl_drop; | |
1314 | break; | |
1315 | case TC_CBQ_OVL_RCLASSIC: | |
1316 | cl->overlimit = cbq_ovl_rclassic; | |
1317 | break; | |
1318 | default: | |
1319 | return -EINVAL; | |
1320 | } | |
1a13cb63 | 1321 | cl->penalty = ovl->penalty; |
1da177e4 LT |
1322 | return 0; |
1323 | } | |
1324 | ||
c3bc7cff | 1325 | #ifdef CONFIG_NET_CLS_ACT |
1da177e4 LT |
1326 | static int cbq_set_police(struct cbq_class *cl, struct tc_cbq_police *p) |
1327 | { | |
1328 | cl->police = p->police; | |
1329 | ||
1330 | if (cl->q->handle) { | |
1331 | if (p->police == TC_POLICE_RECLASSIFY) | |
1332 | cl->q->reshape_fail = cbq_reshape_fail; | |
1333 | else | |
1334 | cl->q->reshape_fail = NULL; | |
1335 | } | |
1336 | return 0; | |
1337 | } | |
1338 | #endif | |
1339 | ||
1340 | static int cbq_set_fopt(struct cbq_class *cl, struct tc_cbq_fopt *fopt) | |
1341 | { | |
1342 | cbq_change_defmap(cl, fopt->split, fopt->defmap, fopt->defchange); | |
1343 | return 0; | |
1344 | } | |
1345 | ||
27a3421e PM |
1346 | static const struct nla_policy cbq_policy[TCA_CBQ_MAX + 1] = { |
1347 | [TCA_CBQ_LSSOPT] = { .len = sizeof(struct tc_cbq_lssopt) }, | |
1348 | [TCA_CBQ_WRROPT] = { .len = sizeof(struct tc_cbq_wrropt) }, | |
1349 | [TCA_CBQ_FOPT] = { .len = sizeof(struct tc_cbq_fopt) }, | |
1350 | [TCA_CBQ_OVL_STRATEGY] = { .len = sizeof(struct tc_cbq_ovl) }, | |
1351 | [TCA_CBQ_RATE] = { .len = sizeof(struct tc_ratespec) }, | |
1352 | [TCA_CBQ_RTAB] = { .type = NLA_BINARY, .len = TC_RTAB_SIZE }, | |
1353 | [TCA_CBQ_POLICE] = { .len = sizeof(struct tc_cbq_police) }, | |
1354 | }; | |
1355 | ||
1e90474c | 1356 | static int cbq_init(struct Qdisc *sch, struct nlattr *opt) |
1da177e4 LT |
1357 | { |
1358 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1e90474c | 1359 | struct nlattr *tb[TCA_CBQ_MAX + 1]; |
1da177e4 | 1360 | struct tc_ratespec *r; |
cee63723 PM |
1361 | int err; |
1362 | ||
27a3421e | 1363 | err = nla_parse_nested(tb, TCA_CBQ_MAX, opt, cbq_policy); |
cee63723 PM |
1364 | if (err < 0) |
1365 | return err; | |
1da177e4 | 1366 | |
27a3421e | 1367 | if (tb[TCA_CBQ_RTAB] == NULL || tb[TCA_CBQ_RATE] == NULL) |
1da177e4 LT |
1368 | return -EINVAL; |
1369 | ||
1e90474c | 1370 | r = nla_data(tb[TCA_CBQ_RATE]); |
1da177e4 | 1371 | |
1e90474c | 1372 | if ((q->link.R_tab = qdisc_get_rtab(r, tb[TCA_CBQ_RTAB])) == NULL) |
1da177e4 LT |
1373 | return -EINVAL; |
1374 | ||
d77fea2e PM |
1375 | err = qdisc_class_hash_init(&q->clhash); |
1376 | if (err < 0) | |
1377 | goto put_rtab; | |
1378 | ||
1da177e4 LT |
1379 | q->link.refcnt = 1; |
1380 | q->link.sibling = &q->link; | |
d77fea2e | 1381 | q->link.common.classid = sch->handle; |
1da177e4 | 1382 | q->link.qdisc = sch; |
5ce2d488 | 1383 | if (!(q->link.q = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue, |
bb949fbd | 1384 | &pfifo_qdisc_ops, |
9f9afec4 | 1385 | sch->handle))) |
1da177e4 LT |
1386 | q->link.q = &noop_qdisc; |
1387 | ||
1388 | q->link.priority = TC_CBQ_MAXPRIO-1; | |
1389 | q->link.priority2 = TC_CBQ_MAXPRIO-1; | |
1390 | q->link.cpriority = TC_CBQ_MAXPRIO-1; | |
1391 | q->link.ovl_strategy = TC_CBQ_OVL_CLASSIC; | |
1392 | q->link.overlimit = cbq_ovl_classic; | |
5ce2d488 | 1393 | q->link.allot = psched_mtu(qdisc_dev(sch)); |
1da177e4 LT |
1394 | q->link.quantum = q->link.allot; |
1395 | q->link.weight = q->link.R_tab->rate.rate; | |
1396 | ||
1397 | q->link.ewma_log = TC_CBQ_DEF_EWMA; | |
1398 | q->link.avpkt = q->link.allot/2; | |
1399 | q->link.minidle = -0x7FFFFFFF; | |
1da177e4 | 1400 | |
88a99354 | 1401 | qdisc_watchdog_init(&q->watchdog, sch); |
38acce2d DM |
1402 | tasklet_hrtimer_init(&q->delay_timer, cbq_undelay, |
1403 | CLOCK_MONOTONIC, HRTIMER_MODE_ABS); | |
1da177e4 LT |
1404 | q->delay_timer.function = cbq_undelay; |
1405 | q->toplevel = TC_CBQ_MAXLEVEL; | |
3bebcda2 | 1406 | q->now = psched_get_time(); |
1da177e4 LT |
1407 | q->now_rt = q->now; |
1408 | ||
1409 | cbq_link_class(&q->link); | |
1410 | ||
1e90474c PM |
1411 | if (tb[TCA_CBQ_LSSOPT]) |
1412 | cbq_set_lss(&q->link, nla_data(tb[TCA_CBQ_LSSOPT])); | |
1da177e4 LT |
1413 | |
1414 | cbq_addprio(q, &q->link); | |
1415 | return 0; | |
d77fea2e PM |
1416 | |
1417 | put_rtab: | |
1418 | qdisc_put_rtab(q->link.R_tab); | |
1419 | return err; | |
1da177e4 LT |
1420 | } |
1421 | ||
1422 | static __inline__ int cbq_dump_rate(struct sk_buff *skb, struct cbq_class *cl) | |
1423 | { | |
27a884dc | 1424 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 | 1425 | |
1e90474c | 1426 | NLA_PUT(skb, TCA_CBQ_RATE, sizeof(cl->R_tab->rate), &cl->R_tab->rate); |
1da177e4 LT |
1427 | return skb->len; |
1428 | ||
1e90474c | 1429 | nla_put_failure: |
dc5fc579 | 1430 | nlmsg_trim(skb, b); |
1da177e4 LT |
1431 | return -1; |
1432 | } | |
1433 | ||
1434 | static __inline__ int cbq_dump_lss(struct sk_buff *skb, struct cbq_class *cl) | |
1435 | { | |
27a884dc | 1436 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
1437 | struct tc_cbq_lssopt opt; |
1438 | ||
1439 | opt.flags = 0; | |
1440 | if (cl->borrow == NULL) | |
1441 | opt.flags |= TCF_CBQ_LSS_BOUNDED; | |
1442 | if (cl->share == NULL) | |
1443 | opt.flags |= TCF_CBQ_LSS_ISOLATED; | |
1444 | opt.ewma_log = cl->ewma_log; | |
1445 | opt.level = cl->level; | |
1446 | opt.avpkt = cl->avpkt; | |
1447 | opt.maxidle = cl->maxidle; | |
1448 | opt.minidle = (u32)(-cl->minidle); | |
1449 | opt.offtime = cl->offtime; | |
1450 | opt.change = ~0; | |
1e90474c | 1451 | NLA_PUT(skb, TCA_CBQ_LSSOPT, sizeof(opt), &opt); |
1da177e4 LT |
1452 | return skb->len; |
1453 | ||
1e90474c | 1454 | nla_put_failure: |
dc5fc579 | 1455 | nlmsg_trim(skb, b); |
1da177e4 LT |
1456 | return -1; |
1457 | } | |
1458 | ||
1459 | static __inline__ int cbq_dump_wrr(struct sk_buff *skb, struct cbq_class *cl) | |
1460 | { | |
27a884dc | 1461 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
1462 | struct tc_cbq_wrropt opt; |
1463 | ||
1464 | opt.flags = 0; | |
1465 | opt.allot = cl->allot; | |
1466 | opt.priority = cl->priority+1; | |
1467 | opt.cpriority = cl->cpriority+1; | |
1468 | opt.weight = cl->weight; | |
1e90474c | 1469 | NLA_PUT(skb, TCA_CBQ_WRROPT, sizeof(opt), &opt); |
1da177e4 LT |
1470 | return skb->len; |
1471 | ||
1e90474c | 1472 | nla_put_failure: |
dc5fc579 | 1473 | nlmsg_trim(skb, b); |
1da177e4 LT |
1474 | return -1; |
1475 | } | |
1476 | ||
1477 | static __inline__ int cbq_dump_ovl(struct sk_buff *skb, struct cbq_class *cl) | |
1478 | { | |
27a884dc | 1479 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
1480 | struct tc_cbq_ovl opt; |
1481 | ||
1482 | opt.strategy = cl->ovl_strategy; | |
1483 | opt.priority2 = cl->priority2+1; | |
8a47077a | 1484 | opt.pad = 0; |
1a13cb63 | 1485 | opt.penalty = cl->penalty; |
1e90474c | 1486 | NLA_PUT(skb, TCA_CBQ_OVL_STRATEGY, sizeof(opt), &opt); |
1da177e4 LT |
1487 | return skb->len; |
1488 | ||
1e90474c | 1489 | nla_put_failure: |
dc5fc579 | 1490 | nlmsg_trim(skb, b); |
1da177e4 LT |
1491 | return -1; |
1492 | } | |
1493 | ||
1494 | static __inline__ int cbq_dump_fopt(struct sk_buff *skb, struct cbq_class *cl) | |
1495 | { | |
27a884dc | 1496 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
1497 | struct tc_cbq_fopt opt; |
1498 | ||
1499 | if (cl->split || cl->defmap) { | |
d77fea2e | 1500 | opt.split = cl->split ? cl->split->common.classid : 0; |
1da177e4 LT |
1501 | opt.defmap = cl->defmap; |
1502 | opt.defchange = ~0; | |
1e90474c | 1503 | NLA_PUT(skb, TCA_CBQ_FOPT, sizeof(opt), &opt); |
1da177e4 LT |
1504 | } |
1505 | return skb->len; | |
1506 | ||
1e90474c | 1507 | nla_put_failure: |
dc5fc579 | 1508 | nlmsg_trim(skb, b); |
1da177e4 LT |
1509 | return -1; |
1510 | } | |
1511 | ||
c3bc7cff | 1512 | #ifdef CONFIG_NET_CLS_ACT |
1da177e4 LT |
1513 | static __inline__ int cbq_dump_police(struct sk_buff *skb, struct cbq_class *cl) |
1514 | { | |
27a884dc | 1515 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
1516 | struct tc_cbq_police opt; |
1517 | ||
1518 | if (cl->police) { | |
1519 | opt.police = cl->police; | |
9ef1d4c7 PM |
1520 | opt.__res1 = 0; |
1521 | opt.__res2 = 0; | |
1e90474c | 1522 | NLA_PUT(skb, TCA_CBQ_POLICE, sizeof(opt), &opt); |
1da177e4 LT |
1523 | } |
1524 | return skb->len; | |
1525 | ||
1e90474c | 1526 | nla_put_failure: |
dc5fc579 | 1527 | nlmsg_trim(skb, b); |
1da177e4 LT |
1528 | return -1; |
1529 | } | |
1530 | #endif | |
1531 | ||
1532 | static int cbq_dump_attr(struct sk_buff *skb, struct cbq_class *cl) | |
1533 | { | |
1534 | if (cbq_dump_lss(skb, cl) < 0 || | |
1535 | cbq_dump_rate(skb, cl) < 0 || | |
1536 | cbq_dump_wrr(skb, cl) < 0 || | |
1537 | cbq_dump_ovl(skb, cl) < 0 || | |
c3bc7cff | 1538 | #ifdef CONFIG_NET_CLS_ACT |
1da177e4 LT |
1539 | cbq_dump_police(skb, cl) < 0 || |
1540 | #endif | |
1541 | cbq_dump_fopt(skb, cl) < 0) | |
1542 | return -1; | |
1543 | return 0; | |
1544 | } | |
1545 | ||
1546 | static int cbq_dump(struct Qdisc *sch, struct sk_buff *skb) | |
1547 | { | |
1548 | struct cbq_sched_data *q = qdisc_priv(sch); | |
4b3550ef | 1549 | struct nlattr *nest; |
1da177e4 | 1550 | |
4b3550ef PM |
1551 | nest = nla_nest_start(skb, TCA_OPTIONS); |
1552 | if (nest == NULL) | |
1553 | goto nla_put_failure; | |
1da177e4 | 1554 | if (cbq_dump_attr(skb, &q->link) < 0) |
1e90474c | 1555 | goto nla_put_failure; |
4b3550ef | 1556 | nla_nest_end(skb, nest); |
1da177e4 LT |
1557 | return skb->len; |
1558 | ||
1e90474c | 1559 | nla_put_failure: |
4b3550ef | 1560 | nla_nest_cancel(skb, nest); |
1da177e4 LT |
1561 | return -1; |
1562 | } | |
1563 | ||
1564 | static int | |
1565 | cbq_dump_stats(struct Qdisc *sch, struct gnet_dump *d) | |
1566 | { | |
1567 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1568 | ||
1569 | q->link.xstats.avgidle = q->link.avgidle; | |
1570 | return gnet_stats_copy_app(d, &q->link.xstats, sizeof(q->link.xstats)); | |
1571 | } | |
1572 | ||
1573 | static int | |
1574 | cbq_dump_class(struct Qdisc *sch, unsigned long arg, | |
1575 | struct sk_buff *skb, struct tcmsg *tcm) | |
1576 | { | |
1577 | struct cbq_class *cl = (struct cbq_class*)arg; | |
4b3550ef | 1578 | struct nlattr *nest; |
1da177e4 LT |
1579 | |
1580 | if (cl->tparent) | |
d77fea2e | 1581 | tcm->tcm_parent = cl->tparent->common.classid; |
1da177e4 LT |
1582 | else |
1583 | tcm->tcm_parent = TC_H_ROOT; | |
d77fea2e | 1584 | tcm->tcm_handle = cl->common.classid; |
1da177e4 LT |
1585 | tcm->tcm_info = cl->q->handle; |
1586 | ||
4b3550ef PM |
1587 | nest = nla_nest_start(skb, TCA_OPTIONS); |
1588 | if (nest == NULL) | |
1589 | goto nla_put_failure; | |
1da177e4 | 1590 | if (cbq_dump_attr(skb, cl) < 0) |
1e90474c | 1591 | goto nla_put_failure; |
4b3550ef | 1592 | nla_nest_end(skb, nest); |
1da177e4 LT |
1593 | return skb->len; |
1594 | ||
1e90474c | 1595 | nla_put_failure: |
4b3550ef | 1596 | nla_nest_cancel(skb, nest); |
1da177e4 LT |
1597 | return -1; |
1598 | } | |
1599 | ||
1600 | static int | |
1601 | cbq_dump_class_stats(struct Qdisc *sch, unsigned long arg, | |
1602 | struct gnet_dump *d) | |
1603 | { | |
1604 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1605 | struct cbq_class *cl = (struct cbq_class*)arg; | |
1606 | ||
1607 | cl->qstats.qlen = cl->q->q.qlen; | |
1608 | cl->xstats.avgidle = cl->avgidle; | |
1609 | cl->xstats.undertime = 0; | |
1610 | ||
a084980d | 1611 | if (cl->undertime != PSCHED_PASTPERFECT) |
8edc0c31 | 1612 | cl->xstats.undertime = cl->undertime - q->now; |
1da177e4 LT |
1613 | |
1614 | if (gnet_stats_copy_basic(d, &cl->bstats) < 0 || | |
1da177e4 | 1615 | gnet_stats_copy_rate_est(d, &cl->rate_est) < 0 || |
1da177e4 LT |
1616 | gnet_stats_copy_queue(d, &cl->qstats) < 0) |
1617 | return -1; | |
1618 | ||
1619 | return gnet_stats_copy_app(d, &cl->xstats, sizeof(cl->xstats)); | |
1620 | } | |
1621 | ||
1622 | static int cbq_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new, | |
1623 | struct Qdisc **old) | |
1624 | { | |
1625 | struct cbq_class *cl = (struct cbq_class*)arg; | |
1626 | ||
1627 | if (cl) { | |
1628 | if (new == NULL) { | |
5ce2d488 | 1629 | new = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue, |
bb949fbd | 1630 | &pfifo_qdisc_ops, |
d77fea2e PM |
1631 | cl->common.classid); |
1632 | if (new == NULL) | |
1da177e4 LT |
1633 | return -ENOBUFS; |
1634 | } else { | |
c3bc7cff | 1635 | #ifdef CONFIG_NET_CLS_ACT |
1da177e4 LT |
1636 | if (cl->police == TC_POLICE_RECLASSIFY) |
1637 | new->reshape_fail = cbq_reshape_fail; | |
1638 | #endif | |
1639 | } | |
1640 | sch_tree_lock(sch); | |
b94c8afc PM |
1641 | *old = cl->q; |
1642 | cl->q = new; | |
5e50da01 | 1643 | qdisc_tree_decrease_qlen(*old, (*old)->q.qlen); |
1da177e4 LT |
1644 | qdisc_reset(*old); |
1645 | sch_tree_unlock(sch); | |
1646 | ||
1647 | return 0; | |
1648 | } | |
1649 | return -ENOENT; | |
1650 | } | |
1651 | ||
1652 | static struct Qdisc * | |
1653 | cbq_leaf(struct Qdisc *sch, unsigned long arg) | |
1654 | { | |
1655 | struct cbq_class *cl = (struct cbq_class*)arg; | |
1656 | ||
1657 | return cl ? cl->q : NULL; | |
1658 | } | |
1659 | ||
a37ef2e3 JP |
1660 | static void cbq_qlen_notify(struct Qdisc *sch, unsigned long arg) |
1661 | { | |
1662 | struct cbq_class *cl = (struct cbq_class *)arg; | |
1663 | ||
1664 | if (cl->q->q.qlen == 0) | |
1665 | cbq_deactivate_class(cl); | |
1666 | } | |
1667 | ||
1da177e4 LT |
1668 | static unsigned long cbq_get(struct Qdisc *sch, u32 classid) |
1669 | { | |
1670 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1671 | struct cbq_class *cl = cbq_class_lookup(q, classid); | |
1672 | ||
1673 | if (cl) { | |
1674 | cl->refcnt++; | |
1675 | return (unsigned long)cl; | |
1676 | } | |
1677 | return 0; | |
1678 | } | |
1679 | ||
1da177e4 LT |
1680 | static void cbq_destroy_class(struct Qdisc *sch, struct cbq_class *cl) |
1681 | { | |
1682 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1683 | ||
547b792c | 1684 | WARN_ON(cl->filters); |
1da177e4 | 1685 | |
ff31ab56 | 1686 | tcf_destroy_chain(&cl->filter_list); |
1da177e4 LT |
1687 | qdisc_destroy(cl->q); |
1688 | qdisc_put_rtab(cl->R_tab); | |
1da177e4 | 1689 | gen_kill_estimator(&cl->bstats, &cl->rate_est); |
1da177e4 LT |
1690 | if (cl != &q->link) |
1691 | kfree(cl); | |
1692 | } | |
1693 | ||
1694 | static void | |
1695 | cbq_destroy(struct Qdisc* sch) | |
1696 | { | |
1697 | struct cbq_sched_data *q = qdisc_priv(sch); | |
d77fea2e | 1698 | struct hlist_node *n, *next; |
1da177e4 LT |
1699 | struct cbq_class *cl; |
1700 | unsigned h; | |
1701 | ||
c3bc7cff | 1702 | #ifdef CONFIG_NET_CLS_ACT |
1da177e4 LT |
1703 | q->rx_class = NULL; |
1704 | #endif | |
1705 | /* | |
1706 | * Filters must be destroyed first because we don't destroy the | |
1707 | * classes from root to leafs which means that filters can still | |
1708 | * be bound to classes which have been destroyed already. --TGR '04 | |
1709 | */ | |
d77fea2e PM |
1710 | for (h = 0; h < q->clhash.hashsize; h++) { |
1711 | hlist_for_each_entry(cl, n, &q->clhash.hash[h], common.hnode) | |
ff31ab56 | 1712 | tcf_destroy_chain(&cl->filter_list); |
b00b4bf9 | 1713 | } |
d77fea2e PM |
1714 | for (h = 0; h < q->clhash.hashsize; h++) { |
1715 | hlist_for_each_entry_safe(cl, n, next, &q->clhash.hash[h], | |
1716 | common.hnode) | |
1da177e4 | 1717 | cbq_destroy_class(sch, cl); |
1da177e4 | 1718 | } |
d77fea2e | 1719 | qdisc_class_hash_destroy(&q->clhash); |
1da177e4 LT |
1720 | } |
1721 | ||
1722 | static void cbq_put(struct Qdisc *sch, unsigned long arg) | |
1723 | { | |
1724 | struct cbq_class *cl = (struct cbq_class*)arg; | |
1725 | ||
1726 | if (--cl->refcnt == 0) { | |
c3bc7cff | 1727 | #ifdef CONFIG_NET_CLS_ACT |
102396ae | 1728 | spinlock_t *root_lock = qdisc_root_sleeping_lock(sch); |
1da177e4 LT |
1729 | struct cbq_sched_data *q = qdisc_priv(sch); |
1730 | ||
7698b4fc | 1731 | spin_lock_bh(root_lock); |
1da177e4 LT |
1732 | if (q->rx_class == cl) |
1733 | q->rx_class = NULL; | |
7698b4fc | 1734 | spin_unlock_bh(root_lock); |
1da177e4 LT |
1735 | #endif |
1736 | ||
1737 | cbq_destroy_class(sch, cl); | |
1738 | } | |
1739 | } | |
1740 | ||
1741 | static int | |
1e90474c | 1742 | cbq_change_class(struct Qdisc *sch, u32 classid, u32 parentid, struct nlattr **tca, |
1da177e4 LT |
1743 | unsigned long *arg) |
1744 | { | |
1745 | int err; | |
1746 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1747 | struct cbq_class *cl = (struct cbq_class*)*arg; | |
1e90474c PM |
1748 | struct nlattr *opt = tca[TCA_OPTIONS]; |
1749 | struct nlattr *tb[TCA_CBQ_MAX + 1]; | |
1da177e4 LT |
1750 | struct cbq_class *parent; |
1751 | struct qdisc_rate_table *rtab = NULL; | |
1752 | ||
cee63723 | 1753 | if (opt == NULL) |
1da177e4 LT |
1754 | return -EINVAL; |
1755 | ||
27a3421e | 1756 | err = nla_parse_nested(tb, TCA_CBQ_MAX, opt, cbq_policy); |
cee63723 PM |
1757 | if (err < 0) |
1758 | return err; | |
1759 | ||
1da177e4 LT |
1760 | if (cl) { |
1761 | /* Check parent */ | |
1762 | if (parentid) { | |
d77fea2e PM |
1763 | if (cl->tparent && |
1764 | cl->tparent->common.classid != parentid) | |
1da177e4 LT |
1765 | return -EINVAL; |
1766 | if (!cl->tparent && parentid != TC_H_ROOT) | |
1767 | return -EINVAL; | |
1768 | } | |
1769 | ||
1e90474c | 1770 | if (tb[TCA_CBQ_RATE]) { |
71bcb09a SH |
1771 | rtab = qdisc_get_rtab(nla_data(tb[TCA_CBQ_RATE]), |
1772 | tb[TCA_CBQ_RTAB]); | |
1da177e4 LT |
1773 | if (rtab == NULL) |
1774 | return -EINVAL; | |
1775 | } | |
1776 | ||
71bcb09a SH |
1777 | if (tca[TCA_RATE]) { |
1778 | err = gen_replace_estimator(&cl->bstats, &cl->rate_est, | |
1779 | qdisc_root_sleeping_lock(sch), | |
1780 | tca[TCA_RATE]); | |
1781 | if (err) { | |
1782 | if (rtab) | |
1783 | qdisc_put_rtab(rtab); | |
1784 | return err; | |
1785 | } | |
1786 | } | |
1787 | ||
1da177e4 LT |
1788 | /* Change class parameters */ |
1789 | sch_tree_lock(sch); | |
1790 | ||
1791 | if (cl->next_alive != NULL) | |
1792 | cbq_deactivate_class(cl); | |
1793 | ||
1794 | if (rtab) { | |
b94c8afc PM |
1795 | qdisc_put_rtab(cl->R_tab); |
1796 | cl->R_tab = rtab; | |
1da177e4 LT |
1797 | } |
1798 | ||
1e90474c PM |
1799 | if (tb[TCA_CBQ_LSSOPT]) |
1800 | cbq_set_lss(cl, nla_data(tb[TCA_CBQ_LSSOPT])); | |
1da177e4 | 1801 | |
1e90474c | 1802 | if (tb[TCA_CBQ_WRROPT]) { |
1da177e4 | 1803 | cbq_rmprio(q, cl); |
1e90474c | 1804 | cbq_set_wrr(cl, nla_data(tb[TCA_CBQ_WRROPT])); |
1da177e4 LT |
1805 | } |
1806 | ||
1e90474c PM |
1807 | if (tb[TCA_CBQ_OVL_STRATEGY]) |
1808 | cbq_set_overlimit(cl, nla_data(tb[TCA_CBQ_OVL_STRATEGY])); | |
1da177e4 | 1809 | |
c3bc7cff | 1810 | #ifdef CONFIG_NET_CLS_ACT |
1e90474c PM |
1811 | if (tb[TCA_CBQ_POLICE]) |
1812 | cbq_set_police(cl, nla_data(tb[TCA_CBQ_POLICE])); | |
1da177e4 LT |
1813 | #endif |
1814 | ||
1e90474c PM |
1815 | if (tb[TCA_CBQ_FOPT]) |
1816 | cbq_set_fopt(cl, nla_data(tb[TCA_CBQ_FOPT])); | |
1da177e4 LT |
1817 | |
1818 | if (cl->q->q.qlen) | |
1819 | cbq_activate_class(cl); | |
1820 | ||
1821 | sch_tree_unlock(sch); | |
1822 | ||
1da177e4 LT |
1823 | return 0; |
1824 | } | |
1825 | ||
1826 | if (parentid == TC_H_ROOT) | |
1827 | return -EINVAL; | |
1828 | ||
1e90474c PM |
1829 | if (tb[TCA_CBQ_WRROPT] == NULL || tb[TCA_CBQ_RATE] == NULL || |
1830 | tb[TCA_CBQ_LSSOPT] == NULL) | |
1da177e4 LT |
1831 | return -EINVAL; |
1832 | ||
1e90474c | 1833 | rtab = qdisc_get_rtab(nla_data(tb[TCA_CBQ_RATE]), tb[TCA_CBQ_RTAB]); |
1da177e4 LT |
1834 | if (rtab == NULL) |
1835 | return -EINVAL; | |
1836 | ||
1837 | if (classid) { | |
1838 | err = -EINVAL; | |
1839 | if (TC_H_MAJ(classid^sch->handle) || cbq_class_lookup(q, classid)) | |
1840 | goto failure; | |
1841 | } else { | |
1842 | int i; | |
1843 | classid = TC_H_MAKE(sch->handle,0x8000); | |
1844 | ||
1845 | for (i=0; i<0x8000; i++) { | |
1846 | if (++q->hgenerator >= 0x8000) | |
1847 | q->hgenerator = 1; | |
1848 | if (cbq_class_lookup(q, classid|q->hgenerator) == NULL) | |
1849 | break; | |
1850 | } | |
1851 | err = -ENOSR; | |
1852 | if (i >= 0x8000) | |
1853 | goto failure; | |
1854 | classid = classid|q->hgenerator; | |
1855 | } | |
1856 | ||
1857 | parent = &q->link; | |
1858 | if (parentid) { | |
1859 | parent = cbq_class_lookup(q, parentid); | |
1860 | err = -EINVAL; | |
1861 | if (parent == NULL) | |
1862 | goto failure; | |
1863 | } | |
1864 | ||
1865 | err = -ENOBUFS; | |
0da974f4 | 1866 | cl = kzalloc(sizeof(*cl), GFP_KERNEL); |
1da177e4 LT |
1867 | if (cl == NULL) |
1868 | goto failure; | |
71bcb09a SH |
1869 | |
1870 | if (tca[TCA_RATE]) { | |
1871 | err = gen_new_estimator(&cl->bstats, &cl->rate_est, | |
1872 | qdisc_root_sleeping_lock(sch), | |
1873 | tca[TCA_RATE]); | |
1874 | if (err) { | |
1875 | kfree(cl); | |
1876 | goto failure; | |
1877 | } | |
1878 | } | |
1879 | ||
1da177e4 LT |
1880 | cl->R_tab = rtab; |
1881 | rtab = NULL; | |
1882 | cl->refcnt = 1; | |
5ce2d488 | 1883 | if (!(cl->q = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue, |
bb949fbd | 1884 | &pfifo_qdisc_ops, classid))) |
1da177e4 | 1885 | cl->q = &noop_qdisc; |
d77fea2e | 1886 | cl->common.classid = classid; |
1da177e4 LT |
1887 | cl->tparent = parent; |
1888 | cl->qdisc = sch; | |
1889 | cl->allot = parent->allot; | |
1890 | cl->quantum = cl->allot; | |
1891 | cl->weight = cl->R_tab->rate.rate; | |
1da177e4 LT |
1892 | |
1893 | sch_tree_lock(sch); | |
1894 | cbq_link_class(cl); | |
1895 | cl->borrow = cl->tparent; | |
1896 | if (cl->tparent != &q->link) | |
1897 | cl->share = cl->tparent; | |
1898 | cbq_adjust_levels(parent); | |
1899 | cl->minidle = -0x7FFFFFFF; | |
1e90474c PM |
1900 | cbq_set_lss(cl, nla_data(tb[TCA_CBQ_LSSOPT])); |
1901 | cbq_set_wrr(cl, nla_data(tb[TCA_CBQ_WRROPT])); | |
1da177e4 LT |
1902 | if (cl->ewma_log==0) |
1903 | cl->ewma_log = q->link.ewma_log; | |
1904 | if (cl->maxidle==0) | |
1905 | cl->maxidle = q->link.maxidle; | |
1906 | if (cl->avpkt==0) | |
1907 | cl->avpkt = q->link.avpkt; | |
1908 | cl->overlimit = cbq_ovl_classic; | |
1e90474c PM |
1909 | if (tb[TCA_CBQ_OVL_STRATEGY]) |
1910 | cbq_set_overlimit(cl, nla_data(tb[TCA_CBQ_OVL_STRATEGY])); | |
c3bc7cff | 1911 | #ifdef CONFIG_NET_CLS_ACT |
1e90474c PM |
1912 | if (tb[TCA_CBQ_POLICE]) |
1913 | cbq_set_police(cl, nla_data(tb[TCA_CBQ_POLICE])); | |
1da177e4 | 1914 | #endif |
1e90474c PM |
1915 | if (tb[TCA_CBQ_FOPT]) |
1916 | cbq_set_fopt(cl, nla_data(tb[TCA_CBQ_FOPT])); | |
1da177e4 LT |
1917 | sch_tree_unlock(sch); |
1918 | ||
d77fea2e PM |
1919 | qdisc_class_hash_grow(sch, &q->clhash); |
1920 | ||
1da177e4 LT |
1921 | *arg = (unsigned long)cl; |
1922 | return 0; | |
1923 | ||
1924 | failure: | |
1925 | qdisc_put_rtab(rtab); | |
1926 | return err; | |
1927 | } | |
1928 | ||
1929 | static int cbq_delete(struct Qdisc *sch, unsigned long arg) | |
1930 | { | |
1931 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1932 | struct cbq_class *cl = (struct cbq_class*)arg; | |
a37ef2e3 | 1933 | unsigned int qlen; |
1da177e4 LT |
1934 | |
1935 | if (cl->filters || cl->children || cl == &q->link) | |
1936 | return -EBUSY; | |
1937 | ||
1938 | sch_tree_lock(sch); | |
1939 | ||
a37ef2e3 JP |
1940 | qlen = cl->q->q.qlen; |
1941 | qdisc_reset(cl->q); | |
1942 | qdisc_tree_decrease_qlen(cl->q, qlen); | |
1943 | ||
1da177e4 LT |
1944 | if (cl->next_alive) |
1945 | cbq_deactivate_class(cl); | |
1946 | ||
1947 | if (q->tx_borrowed == cl) | |
1948 | q->tx_borrowed = q->tx_class; | |
1949 | if (q->tx_class == cl) { | |
1950 | q->tx_class = NULL; | |
1951 | q->tx_borrowed = NULL; | |
1952 | } | |
c3bc7cff | 1953 | #ifdef CONFIG_NET_CLS_ACT |
1da177e4 LT |
1954 | if (q->rx_class == cl) |
1955 | q->rx_class = NULL; | |
1956 | #endif | |
1957 | ||
1958 | cbq_unlink_class(cl); | |
1959 | cbq_adjust_levels(cl->tparent); | |
1960 | cl->defmap = 0; | |
1961 | cbq_sync_defmap(cl); | |
1962 | ||
1963 | cbq_rmprio(q, cl); | |
1964 | sch_tree_unlock(sch); | |
1965 | ||
7cd0a638 JP |
1966 | BUG_ON(--cl->refcnt == 0); |
1967 | /* | |
1968 | * This shouldn't happen: we "hold" one cops->get() when called | |
1969 | * from tc_ctl_tclass; the destroy method is done from cops->put(). | |
1970 | */ | |
1da177e4 LT |
1971 | |
1972 | return 0; | |
1973 | } | |
1974 | ||
1975 | static struct tcf_proto **cbq_find_tcf(struct Qdisc *sch, unsigned long arg) | |
1976 | { | |
1977 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1978 | struct cbq_class *cl = (struct cbq_class *)arg; | |
1979 | ||
1980 | if (cl == NULL) | |
1981 | cl = &q->link; | |
1982 | ||
1983 | return &cl->filter_list; | |
1984 | } | |
1985 | ||
1986 | static unsigned long cbq_bind_filter(struct Qdisc *sch, unsigned long parent, | |
1987 | u32 classid) | |
1988 | { | |
1989 | struct cbq_sched_data *q = qdisc_priv(sch); | |
1990 | struct cbq_class *p = (struct cbq_class*)parent; | |
1991 | struct cbq_class *cl = cbq_class_lookup(q, classid); | |
1992 | ||
1993 | if (cl) { | |
1994 | if (p && p->level <= cl->level) | |
1995 | return 0; | |
1996 | cl->filters++; | |
1997 | return (unsigned long)cl; | |
1998 | } | |
1999 | return 0; | |
2000 | } | |
2001 | ||
2002 | static void cbq_unbind_filter(struct Qdisc *sch, unsigned long arg) | |
2003 | { | |
2004 | struct cbq_class *cl = (struct cbq_class*)arg; | |
2005 | ||
2006 | cl->filters--; | |
2007 | } | |
2008 | ||
2009 | static void cbq_walk(struct Qdisc *sch, struct qdisc_walker *arg) | |
2010 | { | |
2011 | struct cbq_sched_data *q = qdisc_priv(sch); | |
d77fea2e PM |
2012 | struct cbq_class *cl; |
2013 | struct hlist_node *n; | |
1da177e4 LT |
2014 | unsigned h; |
2015 | ||
2016 | if (arg->stop) | |
2017 | return; | |
2018 | ||
d77fea2e PM |
2019 | for (h = 0; h < q->clhash.hashsize; h++) { |
2020 | hlist_for_each_entry(cl, n, &q->clhash.hash[h], common.hnode) { | |
1da177e4 LT |
2021 | if (arg->count < arg->skip) { |
2022 | arg->count++; | |
2023 | continue; | |
2024 | } | |
2025 | if (arg->fn(sch, (unsigned long)cl, arg) < 0) { | |
2026 | arg->stop = 1; | |
2027 | return; | |
2028 | } | |
2029 | arg->count++; | |
2030 | } | |
2031 | } | |
2032 | } | |
2033 | ||
20fea08b | 2034 | static const struct Qdisc_class_ops cbq_class_ops = { |
1da177e4 LT |
2035 | .graft = cbq_graft, |
2036 | .leaf = cbq_leaf, | |
a37ef2e3 | 2037 | .qlen_notify = cbq_qlen_notify, |
1da177e4 LT |
2038 | .get = cbq_get, |
2039 | .put = cbq_put, | |
2040 | .change = cbq_change_class, | |
2041 | .delete = cbq_delete, | |
2042 | .walk = cbq_walk, | |
2043 | .tcf_chain = cbq_find_tcf, | |
2044 | .bind_tcf = cbq_bind_filter, | |
2045 | .unbind_tcf = cbq_unbind_filter, | |
2046 | .dump = cbq_dump_class, | |
2047 | .dump_stats = cbq_dump_class_stats, | |
2048 | }; | |
2049 | ||
20fea08b | 2050 | static struct Qdisc_ops cbq_qdisc_ops __read_mostly = { |
1da177e4 LT |
2051 | .next = NULL, |
2052 | .cl_ops = &cbq_class_ops, | |
2053 | .id = "cbq", | |
2054 | .priv_size = sizeof(struct cbq_sched_data), | |
2055 | .enqueue = cbq_enqueue, | |
2056 | .dequeue = cbq_dequeue, | |
77be155c | 2057 | .peek = qdisc_peek_dequeued, |
1da177e4 LT |
2058 | .drop = cbq_drop, |
2059 | .init = cbq_init, | |
2060 | .reset = cbq_reset, | |
2061 | .destroy = cbq_destroy, | |
2062 | .change = NULL, | |
2063 | .dump = cbq_dump, | |
2064 | .dump_stats = cbq_dump_stats, | |
2065 | .owner = THIS_MODULE, | |
2066 | }; | |
2067 | ||
2068 | static int __init cbq_module_init(void) | |
2069 | { | |
2070 | return register_qdisc(&cbq_qdisc_ops); | |
2071 | } | |
10297b99 | 2072 | static void __exit cbq_module_exit(void) |
1da177e4 LT |
2073 | { |
2074 | unregister_qdisc(&cbq_qdisc_ops); | |
2075 | } | |
2076 | module_init(cbq_module_init) | |
2077 | module_exit(cbq_module_exit) | |
2078 | MODULE_LICENSE("GPL"); |