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1da177e4 LT |
1 | /* |
2 | * net/sched/sch_api.c Packet scheduler API. | |
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 | * Fixes: | |
12 | * | |
13 | * Rani Assaf <rani@magic.metawire.com> :980802: JIFFIES and CPU clock sources are repaired. | |
14 | * Eduardo J. Blanco <ejbs@netlabs.com.uy> :990222: kmod support | |
15 | * Jamal Hadi Salim <hadi@nortelnetworks.com>: 990601: ingress support | |
16 | */ | |
17 | ||
18 | #include <linux/config.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/types.h> | |
21 | #include <linux/kernel.h> | |
22 | #include <linux/sched.h> | |
23 | #include <linux/string.h> | |
24 | #include <linux/mm.h> | |
25 | #include <linux/socket.h> | |
26 | #include <linux/sockios.h> | |
27 | #include <linux/in.h> | |
28 | #include <linux/errno.h> | |
29 | #include <linux/interrupt.h> | |
30 | #include <linux/netdevice.h> | |
31 | #include <linux/skbuff.h> | |
32 | #include <linux/rtnetlink.h> | |
33 | #include <linux/init.h> | |
34 | #include <linux/proc_fs.h> | |
35 | #include <linux/seq_file.h> | |
36 | #include <linux/kmod.h> | |
37 | #include <linux/list.h> | |
38 | #include <linux/bitops.h> | |
39 | ||
40 | #include <net/sock.h> | |
41 | #include <net/pkt_sched.h> | |
42 | ||
43 | #include <asm/processor.h> | |
44 | #include <asm/uaccess.h> | |
45 | #include <asm/system.h> | |
46 | ||
47 | static int qdisc_notify(struct sk_buff *oskb, struct nlmsghdr *n, u32 clid, | |
48 | struct Qdisc *old, struct Qdisc *new); | |
49 | static int tclass_notify(struct sk_buff *oskb, struct nlmsghdr *n, | |
50 | struct Qdisc *q, unsigned long cl, int event); | |
51 | ||
52 | /* | |
53 | ||
54 | Short review. | |
55 | ------------- | |
56 | ||
57 | This file consists of two interrelated parts: | |
58 | ||
59 | 1. queueing disciplines manager frontend. | |
60 | 2. traffic classes manager frontend. | |
61 | ||
62 | Generally, queueing discipline ("qdisc") is a black box, | |
63 | which is able to enqueue packets and to dequeue them (when | |
64 | device is ready to send something) in order and at times | |
65 | determined by algorithm hidden in it. | |
66 | ||
67 | qdisc's are divided to two categories: | |
68 | - "queues", which have no internal structure visible from outside. | |
69 | - "schedulers", which split all the packets to "traffic classes", | |
70 | using "packet classifiers" (look at cls_api.c) | |
71 | ||
72 | In turn, classes may have child qdiscs (as rule, queues) | |
73 | attached to them etc. etc. etc. | |
74 | ||
75 | The goal of the routines in this file is to translate | |
76 | information supplied by user in the form of handles | |
77 | to more intelligible for kernel form, to make some sanity | |
78 | checks and part of work, which is common to all qdiscs | |
79 | and to provide rtnetlink notifications. | |
80 | ||
81 | All real intelligent work is done inside qdisc modules. | |
82 | ||
83 | ||
84 | ||
85 | Every discipline has two major routines: enqueue and dequeue. | |
86 | ||
87 | ---dequeue | |
88 | ||
89 | dequeue usually returns a skb to send. It is allowed to return NULL, | |
90 | but it does not mean that queue is empty, it just means that | |
91 | discipline does not want to send anything this time. | |
92 | Queue is really empty if q->q.qlen == 0. | |
93 | For complicated disciplines with multiple queues q->q is not | |
94 | real packet queue, but however q->q.qlen must be valid. | |
95 | ||
96 | ---enqueue | |
97 | ||
98 | enqueue returns 0, if packet was enqueued successfully. | |
99 | If packet (this one or another one) was dropped, it returns | |
100 | not zero error code. | |
101 | NET_XMIT_DROP - this packet dropped | |
102 | Expected action: do not backoff, but wait until queue will clear. | |
103 | NET_XMIT_CN - probably this packet enqueued, but another one dropped. | |
104 | Expected action: backoff or ignore | |
105 | NET_XMIT_POLICED - dropped by police. | |
106 | Expected action: backoff or error to real-time apps. | |
107 | ||
108 | Auxiliary routines: | |
109 | ||
110 | ---requeue | |
111 | ||
112 | requeues once dequeued packet. It is used for non-standard or | |
113 | just buggy devices, which can defer output even if dev->tbusy=0. | |
114 | ||
115 | ---reset | |
116 | ||
117 | returns qdisc to initial state: purge all buffers, clear all | |
118 | timers, counters (except for statistics) etc. | |
119 | ||
120 | ---init | |
121 | ||
122 | initializes newly created qdisc. | |
123 | ||
124 | ---destroy | |
125 | ||
126 | destroys resources allocated by init and during lifetime of qdisc. | |
127 | ||
128 | ---change | |
129 | ||
130 | changes qdisc parameters. | |
131 | */ | |
132 | ||
133 | /* Protects list of registered TC modules. It is pure SMP lock. */ | |
134 | static DEFINE_RWLOCK(qdisc_mod_lock); | |
135 | ||
136 | ||
137 | /************************************************ | |
138 | * Queueing disciplines manipulation. * | |
139 | ************************************************/ | |
140 | ||
141 | ||
142 | /* The list of all installed queueing disciplines. */ | |
143 | ||
144 | static struct Qdisc_ops *qdisc_base; | |
145 | ||
146 | /* Register/uregister queueing discipline */ | |
147 | ||
148 | int register_qdisc(struct Qdisc_ops *qops) | |
149 | { | |
150 | struct Qdisc_ops *q, **qp; | |
151 | int rc = -EEXIST; | |
152 | ||
153 | write_lock(&qdisc_mod_lock); | |
154 | for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next) | |
155 | if (!strcmp(qops->id, q->id)) | |
156 | goto out; | |
157 | ||
158 | if (qops->enqueue == NULL) | |
159 | qops->enqueue = noop_qdisc_ops.enqueue; | |
160 | if (qops->requeue == NULL) | |
161 | qops->requeue = noop_qdisc_ops.requeue; | |
162 | if (qops->dequeue == NULL) | |
163 | qops->dequeue = noop_qdisc_ops.dequeue; | |
164 | ||
165 | qops->next = NULL; | |
166 | *qp = qops; | |
167 | rc = 0; | |
168 | out: | |
169 | write_unlock(&qdisc_mod_lock); | |
170 | return rc; | |
171 | } | |
172 | ||
173 | int unregister_qdisc(struct Qdisc_ops *qops) | |
174 | { | |
175 | struct Qdisc_ops *q, **qp; | |
176 | int err = -ENOENT; | |
177 | ||
178 | write_lock(&qdisc_mod_lock); | |
179 | for (qp = &qdisc_base; (q=*qp)!=NULL; qp = &q->next) | |
180 | if (q == qops) | |
181 | break; | |
182 | if (q) { | |
183 | *qp = q->next; | |
184 | q->next = NULL; | |
185 | err = 0; | |
186 | } | |
187 | write_unlock(&qdisc_mod_lock); | |
188 | return err; | |
189 | } | |
190 | ||
191 | /* We know handle. Find qdisc among all qdisc's attached to device | |
192 | (root qdisc, all its children, children of children etc.) | |
193 | */ | |
194 | ||
195 | struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle) | |
196 | { | |
197 | struct Qdisc *q; | |
198 | ||
199 | read_lock_bh(&qdisc_tree_lock); | |
200 | list_for_each_entry(q, &dev->qdisc_list, list) { | |
201 | if (q->handle == handle) { | |
202 | read_unlock_bh(&qdisc_tree_lock); | |
203 | return q; | |
204 | } | |
205 | } | |
206 | read_unlock_bh(&qdisc_tree_lock); | |
207 | return NULL; | |
208 | } | |
209 | ||
210 | static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid) | |
211 | { | |
212 | unsigned long cl; | |
213 | struct Qdisc *leaf; | |
214 | struct Qdisc_class_ops *cops = p->ops->cl_ops; | |
215 | ||
216 | if (cops == NULL) | |
217 | return NULL; | |
218 | cl = cops->get(p, classid); | |
219 | ||
220 | if (cl == 0) | |
221 | return NULL; | |
222 | leaf = cops->leaf(p, cl); | |
223 | cops->put(p, cl); | |
224 | return leaf; | |
225 | } | |
226 | ||
227 | /* Find queueing discipline by name */ | |
228 | ||
229 | static struct Qdisc_ops *qdisc_lookup_ops(struct rtattr *kind) | |
230 | { | |
231 | struct Qdisc_ops *q = NULL; | |
232 | ||
233 | if (kind) { | |
234 | read_lock(&qdisc_mod_lock); | |
235 | for (q = qdisc_base; q; q = q->next) { | |
236 | if (rtattr_strcmp(kind, q->id) == 0) { | |
237 | if (!try_module_get(q->owner)) | |
238 | q = NULL; | |
239 | break; | |
240 | } | |
241 | } | |
242 | read_unlock(&qdisc_mod_lock); | |
243 | } | |
244 | return q; | |
245 | } | |
246 | ||
247 | static struct qdisc_rate_table *qdisc_rtab_list; | |
248 | ||
249 | struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, struct rtattr *tab) | |
250 | { | |
251 | struct qdisc_rate_table *rtab; | |
252 | ||
253 | for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) { | |
254 | if (memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) == 0) { | |
255 | rtab->refcnt++; | |
256 | return rtab; | |
257 | } | |
258 | } | |
259 | ||
260 | if (tab == NULL || r->rate == 0 || r->cell_log == 0 || RTA_PAYLOAD(tab) != 1024) | |
261 | return NULL; | |
262 | ||
263 | rtab = kmalloc(sizeof(*rtab), GFP_KERNEL); | |
264 | if (rtab) { | |
265 | rtab->rate = *r; | |
266 | rtab->refcnt = 1; | |
267 | memcpy(rtab->data, RTA_DATA(tab), 1024); | |
268 | rtab->next = qdisc_rtab_list; | |
269 | qdisc_rtab_list = rtab; | |
270 | } | |
271 | return rtab; | |
272 | } | |
273 | ||
274 | void qdisc_put_rtab(struct qdisc_rate_table *tab) | |
275 | { | |
276 | struct qdisc_rate_table *rtab, **rtabp; | |
277 | ||
278 | if (!tab || --tab->refcnt) | |
279 | return; | |
280 | ||
281 | for (rtabp = &qdisc_rtab_list; (rtab=*rtabp) != NULL; rtabp = &rtab->next) { | |
282 | if (rtab == tab) { | |
283 | *rtabp = rtab->next; | |
284 | kfree(rtab); | |
285 | return; | |
286 | } | |
287 | } | |
288 | } | |
289 | ||
290 | ||
291 | /* Allocate an unique handle from space managed by kernel */ | |
292 | ||
293 | static u32 qdisc_alloc_handle(struct net_device *dev) | |
294 | { | |
295 | int i = 0x10000; | |
296 | static u32 autohandle = TC_H_MAKE(0x80000000U, 0); | |
297 | ||
298 | do { | |
299 | autohandle += TC_H_MAKE(0x10000U, 0); | |
300 | if (autohandle == TC_H_MAKE(TC_H_ROOT, 0)) | |
301 | autohandle = TC_H_MAKE(0x80000000U, 0); | |
302 | } while (qdisc_lookup(dev, autohandle) && --i > 0); | |
303 | ||
304 | return i>0 ? autohandle : 0; | |
305 | } | |
306 | ||
307 | /* Attach toplevel qdisc to device dev */ | |
308 | ||
309 | static struct Qdisc * | |
310 | dev_graft_qdisc(struct net_device *dev, struct Qdisc *qdisc) | |
311 | { | |
312 | struct Qdisc *oqdisc; | |
313 | ||
314 | if (dev->flags & IFF_UP) | |
315 | dev_deactivate(dev); | |
316 | ||
317 | qdisc_lock_tree(dev); | |
318 | if (qdisc && qdisc->flags&TCQ_F_INGRESS) { | |
319 | oqdisc = dev->qdisc_ingress; | |
320 | /* Prune old scheduler */ | |
321 | if (oqdisc && atomic_read(&oqdisc->refcnt) <= 1) { | |
322 | /* delete */ | |
323 | qdisc_reset(oqdisc); | |
324 | dev->qdisc_ingress = NULL; | |
325 | } else { /* new */ | |
326 | dev->qdisc_ingress = qdisc; | |
327 | } | |
328 | ||
329 | } else { | |
330 | ||
331 | oqdisc = dev->qdisc_sleeping; | |
332 | ||
333 | /* Prune old scheduler */ | |
334 | if (oqdisc && atomic_read(&oqdisc->refcnt) <= 1) | |
335 | qdisc_reset(oqdisc); | |
336 | ||
337 | /* ... and graft new one */ | |
338 | if (qdisc == NULL) | |
339 | qdisc = &noop_qdisc; | |
340 | dev->qdisc_sleeping = qdisc; | |
341 | dev->qdisc = &noop_qdisc; | |
342 | } | |
343 | ||
344 | qdisc_unlock_tree(dev); | |
345 | ||
346 | if (dev->flags & IFF_UP) | |
347 | dev_activate(dev); | |
348 | ||
349 | return oqdisc; | |
350 | } | |
351 | ||
352 | ||
353 | /* Graft qdisc "new" to class "classid" of qdisc "parent" or | |
354 | to device "dev". | |
355 | ||
356 | Old qdisc is not destroyed but returned in *old. | |
357 | */ | |
358 | ||
359 | static int qdisc_graft(struct net_device *dev, struct Qdisc *parent, | |
360 | u32 classid, | |
361 | struct Qdisc *new, struct Qdisc **old) | |
362 | { | |
363 | int err = 0; | |
364 | struct Qdisc *q = *old; | |
365 | ||
366 | ||
367 | if (parent == NULL) { | |
368 | if (q && q->flags&TCQ_F_INGRESS) { | |
369 | *old = dev_graft_qdisc(dev, q); | |
370 | } else { | |
371 | *old = dev_graft_qdisc(dev, new); | |
372 | } | |
373 | } else { | |
374 | struct Qdisc_class_ops *cops = parent->ops->cl_ops; | |
375 | ||
376 | err = -EINVAL; | |
377 | ||
378 | if (cops) { | |
379 | unsigned long cl = cops->get(parent, classid); | |
380 | if (cl) { | |
381 | err = cops->graft(parent, cl, new, old); | |
382 | if (new) | |
383 | new->parent = classid; | |
384 | cops->put(parent, cl); | |
385 | } | |
386 | } | |
387 | } | |
388 | return err; | |
389 | } | |
390 | ||
391 | /* | |
392 | Allocate and initialize new qdisc. | |
393 | ||
394 | Parameters are passed via opt. | |
395 | */ | |
396 | ||
397 | static struct Qdisc * | |
398 | qdisc_create(struct net_device *dev, u32 handle, struct rtattr **tca, int *errp) | |
399 | { | |
400 | int err; | |
401 | struct rtattr *kind = tca[TCA_KIND-1]; | |
402 | void *p = NULL; | |
403 | struct Qdisc *sch; | |
404 | struct Qdisc_ops *ops; | |
405 | int size; | |
406 | ||
407 | ops = qdisc_lookup_ops(kind); | |
408 | #ifdef CONFIG_KMOD | |
409 | if (ops == NULL && kind != NULL) { | |
410 | char name[IFNAMSIZ]; | |
411 | if (rtattr_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) { | |
412 | /* We dropped the RTNL semaphore in order to | |
413 | * perform the module load. So, even if we | |
414 | * succeeded in loading the module we have to | |
415 | * tell the caller to replay the request. We | |
416 | * indicate this using -EAGAIN. | |
417 | * We replay the request because the device may | |
418 | * go away in the mean time. | |
419 | */ | |
420 | rtnl_unlock(); | |
421 | request_module("sch_%s", name); | |
422 | rtnl_lock(); | |
423 | ops = qdisc_lookup_ops(kind); | |
424 | if (ops != NULL) { | |
425 | /* We will try again qdisc_lookup_ops, | |
426 | * so don't keep a reference. | |
427 | */ | |
428 | module_put(ops->owner); | |
429 | err = -EAGAIN; | |
430 | goto err_out; | |
431 | } | |
432 | } | |
433 | } | |
434 | #endif | |
435 | ||
436 | err = -EINVAL; | |
437 | if (ops == NULL) | |
438 | goto err_out; | |
439 | ||
440 | /* ensure that the Qdisc and the private data are 32-byte aligned */ | |
441 | size = ((sizeof(*sch) + QDISC_ALIGN_CONST) & ~QDISC_ALIGN_CONST); | |
442 | size += ops->priv_size + QDISC_ALIGN_CONST; | |
443 | ||
444 | p = kmalloc(size, GFP_KERNEL); | |
445 | err = -ENOBUFS; | |
446 | if (!p) | |
447 | goto err_out2; | |
448 | memset(p, 0, size); | |
449 | sch = (struct Qdisc *)(((unsigned long)p + QDISC_ALIGN_CONST) | |
450 | & ~QDISC_ALIGN_CONST); | |
451 | sch->padded = (char *)sch - (char *)p; | |
452 | ||
453 | INIT_LIST_HEAD(&sch->list); | |
454 | skb_queue_head_init(&sch->q); | |
455 | ||
456 | if (handle == TC_H_INGRESS) | |
457 | sch->flags |= TCQ_F_INGRESS; | |
458 | ||
459 | sch->ops = ops; | |
460 | sch->enqueue = ops->enqueue; | |
461 | sch->dequeue = ops->dequeue; | |
462 | sch->dev = dev; | |
463 | dev_hold(dev); | |
464 | atomic_set(&sch->refcnt, 1); | |
465 | sch->stats_lock = &dev->queue_lock; | |
466 | if (handle == 0) { | |
467 | handle = qdisc_alloc_handle(dev); | |
468 | err = -ENOMEM; | |
469 | if (handle == 0) | |
470 | goto err_out3; | |
471 | } | |
472 | ||
473 | if (handle == TC_H_INGRESS) | |
474 | sch->handle =TC_H_MAKE(TC_H_INGRESS, 0); | |
475 | else | |
476 | sch->handle = handle; | |
477 | ||
478 | if (!ops->init || (err = ops->init(sch, tca[TCA_OPTIONS-1])) == 0) { | |
479 | qdisc_lock_tree(dev); | |
480 | list_add_tail(&sch->list, &dev->qdisc_list); | |
481 | qdisc_unlock_tree(dev); | |
482 | ||
483 | #ifdef CONFIG_NET_ESTIMATOR | |
484 | if (tca[TCA_RATE-1]) | |
485 | gen_new_estimator(&sch->bstats, &sch->rate_est, | |
486 | sch->stats_lock, tca[TCA_RATE-1]); | |
487 | #endif | |
488 | return sch; | |
489 | } | |
490 | err_out3: | |
491 | dev_put(dev); | |
492 | err_out2: | |
493 | module_put(ops->owner); | |
494 | err_out: | |
495 | *errp = err; | |
496 | if (p) | |
497 | kfree(p); | |
498 | return NULL; | |
499 | } | |
500 | ||
501 | static int qdisc_change(struct Qdisc *sch, struct rtattr **tca) | |
502 | { | |
503 | if (tca[TCA_OPTIONS-1]) { | |
504 | int err; | |
505 | ||
506 | if (sch->ops->change == NULL) | |
507 | return -EINVAL; | |
508 | err = sch->ops->change(sch, tca[TCA_OPTIONS-1]); | |
509 | if (err) | |
510 | return err; | |
511 | } | |
512 | #ifdef CONFIG_NET_ESTIMATOR | |
513 | if (tca[TCA_RATE-1]) | |
514 | gen_replace_estimator(&sch->bstats, &sch->rate_est, | |
515 | sch->stats_lock, tca[TCA_RATE-1]); | |
516 | #endif | |
517 | return 0; | |
518 | } | |
519 | ||
520 | struct check_loop_arg | |
521 | { | |
522 | struct qdisc_walker w; | |
523 | struct Qdisc *p; | |
524 | int depth; | |
525 | }; | |
526 | ||
527 | static int check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w); | |
528 | ||
529 | static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth) | |
530 | { | |
531 | struct check_loop_arg arg; | |
532 | ||
533 | if (q->ops->cl_ops == NULL) | |
534 | return 0; | |
535 | ||
536 | arg.w.stop = arg.w.skip = arg.w.count = 0; | |
537 | arg.w.fn = check_loop_fn; | |
538 | arg.depth = depth; | |
539 | arg.p = p; | |
540 | q->ops->cl_ops->walk(q, &arg.w); | |
541 | return arg.w.stop ? -ELOOP : 0; | |
542 | } | |
543 | ||
544 | static int | |
545 | check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w) | |
546 | { | |
547 | struct Qdisc *leaf; | |
548 | struct Qdisc_class_ops *cops = q->ops->cl_ops; | |
549 | struct check_loop_arg *arg = (struct check_loop_arg *)w; | |
550 | ||
551 | leaf = cops->leaf(q, cl); | |
552 | if (leaf) { | |
553 | if (leaf == arg->p || arg->depth > 7) | |
554 | return -ELOOP; | |
555 | return check_loop(leaf, arg->p, arg->depth + 1); | |
556 | } | |
557 | return 0; | |
558 | } | |
559 | ||
560 | /* | |
561 | * Delete/get qdisc. | |
562 | */ | |
563 | ||
564 | static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
565 | { | |
566 | struct tcmsg *tcm = NLMSG_DATA(n); | |
567 | struct rtattr **tca = arg; | |
568 | struct net_device *dev; | |
569 | u32 clid = tcm->tcm_parent; | |
570 | struct Qdisc *q = NULL; | |
571 | struct Qdisc *p = NULL; | |
572 | int err; | |
573 | ||
574 | if ((dev = __dev_get_by_index(tcm->tcm_ifindex)) == NULL) | |
575 | return -ENODEV; | |
576 | ||
577 | if (clid) { | |
578 | if (clid != TC_H_ROOT) { | |
579 | if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) { | |
580 | if ((p = qdisc_lookup(dev, TC_H_MAJ(clid))) == NULL) | |
581 | return -ENOENT; | |
582 | q = qdisc_leaf(p, clid); | |
583 | } else { /* ingress */ | |
584 | q = dev->qdisc_ingress; | |
585 | } | |
586 | } else { | |
587 | q = dev->qdisc_sleeping; | |
588 | } | |
589 | if (!q) | |
590 | return -ENOENT; | |
591 | ||
592 | if (tcm->tcm_handle && q->handle != tcm->tcm_handle) | |
593 | return -EINVAL; | |
594 | } else { | |
595 | if ((q = qdisc_lookup(dev, tcm->tcm_handle)) == NULL) | |
596 | return -ENOENT; | |
597 | } | |
598 | ||
599 | if (tca[TCA_KIND-1] && rtattr_strcmp(tca[TCA_KIND-1], q->ops->id)) | |
600 | return -EINVAL; | |
601 | ||
602 | if (n->nlmsg_type == RTM_DELQDISC) { | |
603 | if (!clid) | |
604 | return -EINVAL; | |
605 | if (q->handle == 0) | |
606 | return -ENOENT; | |
607 | if ((err = qdisc_graft(dev, p, clid, NULL, &q)) != 0) | |
608 | return err; | |
609 | if (q) { | |
610 | qdisc_notify(skb, n, clid, q, NULL); | |
611 | spin_lock_bh(&dev->queue_lock); | |
612 | qdisc_destroy(q); | |
613 | spin_unlock_bh(&dev->queue_lock); | |
614 | } | |
615 | } else { | |
616 | qdisc_notify(skb, n, clid, NULL, q); | |
617 | } | |
618 | return 0; | |
619 | } | |
620 | ||
621 | /* | |
622 | Create/change qdisc. | |
623 | */ | |
624 | ||
625 | static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
626 | { | |
627 | struct tcmsg *tcm; | |
628 | struct rtattr **tca; | |
629 | struct net_device *dev; | |
630 | u32 clid; | |
631 | struct Qdisc *q, *p; | |
632 | int err; | |
633 | ||
634 | replay: | |
635 | /* Reinit, just in case something touches this. */ | |
636 | tcm = NLMSG_DATA(n); | |
637 | tca = arg; | |
638 | clid = tcm->tcm_parent; | |
639 | q = p = NULL; | |
640 | ||
641 | if ((dev = __dev_get_by_index(tcm->tcm_ifindex)) == NULL) | |
642 | return -ENODEV; | |
643 | ||
644 | if (clid) { | |
645 | if (clid != TC_H_ROOT) { | |
646 | if (clid != TC_H_INGRESS) { | |
647 | if ((p = qdisc_lookup(dev, TC_H_MAJ(clid))) == NULL) | |
648 | return -ENOENT; | |
649 | q = qdisc_leaf(p, clid); | |
650 | } else { /*ingress */ | |
651 | q = dev->qdisc_ingress; | |
652 | } | |
653 | } else { | |
654 | q = dev->qdisc_sleeping; | |
655 | } | |
656 | ||
657 | /* It may be default qdisc, ignore it */ | |
658 | if (q && q->handle == 0) | |
659 | q = NULL; | |
660 | ||
661 | if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) { | |
662 | if (tcm->tcm_handle) { | |
663 | if (q && !(n->nlmsg_flags&NLM_F_REPLACE)) | |
664 | return -EEXIST; | |
665 | if (TC_H_MIN(tcm->tcm_handle)) | |
666 | return -EINVAL; | |
667 | if ((q = qdisc_lookup(dev, tcm->tcm_handle)) == NULL) | |
668 | goto create_n_graft; | |
669 | if (n->nlmsg_flags&NLM_F_EXCL) | |
670 | return -EEXIST; | |
671 | if (tca[TCA_KIND-1] && rtattr_strcmp(tca[TCA_KIND-1], q->ops->id)) | |
672 | return -EINVAL; | |
673 | if (q == p || | |
674 | (p && check_loop(q, p, 0))) | |
675 | return -ELOOP; | |
676 | atomic_inc(&q->refcnt); | |
677 | goto graft; | |
678 | } else { | |
679 | if (q == NULL) | |
680 | goto create_n_graft; | |
681 | ||
682 | /* This magic test requires explanation. | |
683 | * | |
684 | * We know, that some child q is already | |
685 | * attached to this parent and have choice: | |
686 | * either to change it or to create/graft new one. | |
687 | * | |
688 | * 1. We are allowed to create/graft only | |
689 | * if CREATE and REPLACE flags are set. | |
690 | * | |
691 | * 2. If EXCL is set, requestor wanted to say, | |
692 | * that qdisc tcm_handle is not expected | |
693 | * to exist, so that we choose create/graft too. | |
694 | * | |
695 | * 3. The last case is when no flags are set. | |
696 | * Alas, it is sort of hole in API, we | |
697 | * cannot decide what to do unambiguously. | |
698 | * For now we select create/graft, if | |
699 | * user gave KIND, which does not match existing. | |
700 | */ | |
701 | if ((n->nlmsg_flags&NLM_F_CREATE) && | |
702 | (n->nlmsg_flags&NLM_F_REPLACE) && | |
703 | ((n->nlmsg_flags&NLM_F_EXCL) || | |
704 | (tca[TCA_KIND-1] && | |
705 | rtattr_strcmp(tca[TCA_KIND-1], q->ops->id)))) | |
706 | goto create_n_graft; | |
707 | } | |
708 | } | |
709 | } else { | |
710 | if (!tcm->tcm_handle) | |
711 | return -EINVAL; | |
712 | q = qdisc_lookup(dev, tcm->tcm_handle); | |
713 | } | |
714 | ||
715 | /* Change qdisc parameters */ | |
716 | if (q == NULL) | |
717 | return -ENOENT; | |
718 | if (n->nlmsg_flags&NLM_F_EXCL) | |
719 | return -EEXIST; | |
720 | if (tca[TCA_KIND-1] && rtattr_strcmp(tca[TCA_KIND-1], q->ops->id)) | |
721 | return -EINVAL; | |
722 | err = qdisc_change(q, tca); | |
723 | if (err == 0) | |
724 | qdisc_notify(skb, n, clid, NULL, q); | |
725 | return err; | |
726 | ||
727 | create_n_graft: | |
728 | if (!(n->nlmsg_flags&NLM_F_CREATE)) | |
729 | return -ENOENT; | |
730 | if (clid == TC_H_INGRESS) | |
731 | q = qdisc_create(dev, tcm->tcm_parent, tca, &err); | |
732 | else | |
733 | q = qdisc_create(dev, tcm->tcm_handle, tca, &err); | |
734 | if (q == NULL) { | |
735 | if (err == -EAGAIN) | |
736 | goto replay; | |
737 | return err; | |
738 | } | |
739 | ||
740 | graft: | |
741 | if (1) { | |
742 | struct Qdisc *old_q = NULL; | |
743 | err = qdisc_graft(dev, p, clid, q, &old_q); | |
744 | if (err) { | |
745 | if (q) { | |
746 | spin_lock_bh(&dev->queue_lock); | |
747 | qdisc_destroy(q); | |
748 | spin_unlock_bh(&dev->queue_lock); | |
749 | } | |
750 | return err; | |
751 | } | |
752 | qdisc_notify(skb, n, clid, old_q, q); | |
753 | if (old_q) { | |
754 | spin_lock_bh(&dev->queue_lock); | |
755 | qdisc_destroy(old_q); | |
756 | spin_unlock_bh(&dev->queue_lock); | |
757 | } | |
758 | } | |
759 | return 0; | |
760 | } | |
761 | ||
762 | static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid, | |
763 | u32 pid, u32 seq, unsigned flags, int event) | |
764 | { | |
765 | struct tcmsg *tcm; | |
766 | struct nlmsghdr *nlh; | |
767 | unsigned char *b = skb->tail; | |
768 | struct gnet_dump d; | |
769 | ||
770 | nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*tcm)); | |
771 | nlh->nlmsg_flags = flags; | |
772 | tcm = NLMSG_DATA(nlh); | |
773 | tcm->tcm_family = AF_UNSPEC; | |
774 | tcm->tcm_ifindex = q->dev->ifindex; | |
775 | tcm->tcm_parent = clid; | |
776 | tcm->tcm_handle = q->handle; | |
777 | tcm->tcm_info = atomic_read(&q->refcnt); | |
778 | RTA_PUT(skb, TCA_KIND, IFNAMSIZ, q->ops->id); | |
779 | if (q->ops->dump && q->ops->dump(q, skb) < 0) | |
780 | goto rtattr_failure; | |
781 | q->qstats.qlen = q->q.qlen; | |
782 | ||
783 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, | |
784 | TCA_XSTATS, q->stats_lock, &d) < 0) | |
785 | goto rtattr_failure; | |
786 | ||
787 | if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0) | |
788 | goto rtattr_failure; | |
789 | ||
790 | if (gnet_stats_copy_basic(&d, &q->bstats) < 0 || | |
791 | #ifdef CONFIG_NET_ESTIMATOR | |
792 | gnet_stats_copy_rate_est(&d, &q->rate_est) < 0 || | |
793 | #endif | |
794 | gnet_stats_copy_queue(&d, &q->qstats) < 0) | |
795 | goto rtattr_failure; | |
796 | ||
797 | if (gnet_stats_finish_copy(&d) < 0) | |
798 | goto rtattr_failure; | |
799 | ||
800 | nlh->nlmsg_len = skb->tail - b; | |
801 | return skb->len; | |
802 | ||
803 | nlmsg_failure: | |
804 | rtattr_failure: | |
805 | skb_trim(skb, b - skb->data); | |
806 | return -1; | |
807 | } | |
808 | ||
809 | static int qdisc_notify(struct sk_buff *oskb, struct nlmsghdr *n, | |
810 | u32 clid, struct Qdisc *old, struct Qdisc *new) | |
811 | { | |
812 | struct sk_buff *skb; | |
813 | u32 pid = oskb ? NETLINK_CB(oskb).pid : 0; | |
814 | ||
815 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
816 | if (!skb) | |
817 | return -ENOBUFS; | |
818 | ||
819 | if (old && old->handle) { | |
820 | if (tc_fill_qdisc(skb, old, clid, pid, n->nlmsg_seq, 0, RTM_DELQDISC) < 0) | |
821 | goto err_out; | |
822 | } | |
823 | if (new) { | |
824 | if (tc_fill_qdisc(skb, new, clid, pid, n->nlmsg_seq, old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0) | |
825 | goto err_out; | |
826 | } | |
827 | ||
828 | if (skb->len) | |
829 | return rtnetlink_send(skb, pid, RTMGRP_TC, n->nlmsg_flags&NLM_F_ECHO); | |
830 | ||
831 | err_out: | |
832 | kfree_skb(skb); | |
833 | return -EINVAL; | |
834 | } | |
835 | ||
836 | static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb) | |
837 | { | |
838 | int idx, q_idx; | |
839 | int s_idx, s_q_idx; | |
840 | struct net_device *dev; | |
841 | struct Qdisc *q; | |
842 | ||
843 | s_idx = cb->args[0]; | |
844 | s_q_idx = q_idx = cb->args[1]; | |
845 | read_lock(&dev_base_lock); | |
846 | for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) { | |
847 | if (idx < s_idx) | |
848 | continue; | |
849 | if (idx > s_idx) | |
850 | s_q_idx = 0; | |
851 | read_lock_bh(&qdisc_tree_lock); | |
852 | q_idx = 0; | |
853 | list_for_each_entry(q, &dev->qdisc_list, list) { | |
854 | if (q_idx < s_q_idx) { | |
855 | q_idx++; | |
856 | continue; | |
857 | } | |
858 | if (tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).pid, | |
859 | cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0) { | |
860 | read_unlock_bh(&qdisc_tree_lock); | |
861 | goto done; | |
862 | } | |
863 | q_idx++; | |
864 | } | |
865 | read_unlock_bh(&qdisc_tree_lock); | |
866 | } | |
867 | ||
868 | done: | |
869 | read_unlock(&dev_base_lock); | |
870 | ||
871 | cb->args[0] = idx; | |
872 | cb->args[1] = q_idx; | |
873 | ||
874 | return skb->len; | |
875 | } | |
876 | ||
877 | ||
878 | ||
879 | /************************************************ | |
880 | * Traffic classes manipulation. * | |
881 | ************************************************/ | |
882 | ||
883 | ||
884 | ||
885 | static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
886 | { | |
887 | struct tcmsg *tcm = NLMSG_DATA(n); | |
888 | struct rtattr **tca = arg; | |
889 | struct net_device *dev; | |
890 | struct Qdisc *q = NULL; | |
891 | struct Qdisc_class_ops *cops; | |
892 | unsigned long cl = 0; | |
893 | unsigned long new_cl; | |
894 | u32 pid = tcm->tcm_parent; | |
895 | u32 clid = tcm->tcm_handle; | |
896 | u32 qid = TC_H_MAJ(clid); | |
897 | int err; | |
898 | ||
899 | if ((dev = __dev_get_by_index(tcm->tcm_ifindex)) == NULL) | |
900 | return -ENODEV; | |
901 | ||
902 | /* | |
903 | parent == TC_H_UNSPEC - unspecified parent. | |
904 | parent == TC_H_ROOT - class is root, which has no parent. | |
905 | parent == X:0 - parent is root class. | |
906 | parent == X:Y - parent is a node in hierarchy. | |
907 | parent == 0:Y - parent is X:Y, where X:0 is qdisc. | |
908 | ||
909 | handle == 0:0 - generate handle from kernel pool. | |
910 | handle == 0:Y - class is X:Y, where X:0 is qdisc. | |
911 | handle == X:Y - clear. | |
912 | handle == X:0 - root class. | |
913 | */ | |
914 | ||
915 | /* Step 1. Determine qdisc handle X:0 */ | |
916 | ||
917 | if (pid != TC_H_ROOT) { | |
918 | u32 qid1 = TC_H_MAJ(pid); | |
919 | ||
920 | if (qid && qid1) { | |
921 | /* If both majors are known, they must be identical. */ | |
922 | if (qid != qid1) | |
923 | return -EINVAL; | |
924 | } else if (qid1) { | |
925 | qid = qid1; | |
926 | } else if (qid == 0) | |
927 | qid = dev->qdisc_sleeping->handle; | |
928 | ||
929 | /* Now qid is genuine qdisc handle consistent | |
930 | both with parent and child. | |
931 | ||
932 | TC_H_MAJ(pid) still may be unspecified, complete it now. | |
933 | */ | |
934 | if (pid) | |
935 | pid = TC_H_MAKE(qid, pid); | |
936 | } else { | |
937 | if (qid == 0) | |
938 | qid = dev->qdisc_sleeping->handle; | |
939 | } | |
940 | ||
941 | /* OK. Locate qdisc */ | |
942 | if ((q = qdisc_lookup(dev, qid)) == NULL) | |
943 | return -ENOENT; | |
944 | ||
945 | /* An check that it supports classes */ | |
946 | cops = q->ops->cl_ops; | |
947 | if (cops == NULL) | |
948 | return -EINVAL; | |
949 | ||
950 | /* Now try to get class */ | |
951 | if (clid == 0) { | |
952 | if (pid == TC_H_ROOT) | |
953 | clid = qid; | |
954 | } else | |
955 | clid = TC_H_MAKE(qid, clid); | |
956 | ||
957 | if (clid) | |
958 | cl = cops->get(q, clid); | |
959 | ||
960 | if (cl == 0) { | |
961 | err = -ENOENT; | |
962 | if (n->nlmsg_type != RTM_NEWTCLASS || !(n->nlmsg_flags&NLM_F_CREATE)) | |
963 | goto out; | |
964 | } else { | |
965 | switch (n->nlmsg_type) { | |
966 | case RTM_NEWTCLASS: | |
967 | err = -EEXIST; | |
968 | if (n->nlmsg_flags&NLM_F_EXCL) | |
969 | goto out; | |
970 | break; | |
971 | case RTM_DELTCLASS: | |
972 | err = cops->delete(q, cl); | |
973 | if (err == 0) | |
974 | tclass_notify(skb, n, q, cl, RTM_DELTCLASS); | |
975 | goto out; | |
976 | case RTM_GETTCLASS: | |
977 | err = tclass_notify(skb, n, q, cl, RTM_NEWTCLASS); | |
978 | goto out; | |
979 | default: | |
980 | err = -EINVAL; | |
981 | goto out; | |
982 | } | |
983 | } | |
984 | ||
985 | new_cl = cl; | |
986 | err = cops->change(q, clid, pid, tca, &new_cl); | |
987 | if (err == 0) | |
988 | tclass_notify(skb, n, q, new_cl, RTM_NEWTCLASS); | |
989 | ||
990 | out: | |
991 | if (cl) | |
992 | cops->put(q, cl); | |
993 | ||
994 | return err; | |
995 | } | |
996 | ||
997 | ||
998 | static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q, | |
999 | unsigned long cl, | |
1000 | u32 pid, u32 seq, unsigned flags, int event) | |
1001 | { | |
1002 | struct tcmsg *tcm; | |
1003 | struct nlmsghdr *nlh; | |
1004 | unsigned char *b = skb->tail; | |
1005 | struct gnet_dump d; | |
1006 | struct Qdisc_class_ops *cl_ops = q->ops->cl_ops; | |
1007 | ||
1008 | nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*tcm)); | |
1009 | nlh->nlmsg_flags = flags; | |
1010 | tcm = NLMSG_DATA(nlh); | |
1011 | tcm->tcm_family = AF_UNSPEC; | |
1012 | tcm->tcm_ifindex = q->dev->ifindex; | |
1013 | tcm->tcm_parent = q->handle; | |
1014 | tcm->tcm_handle = q->handle; | |
1015 | tcm->tcm_info = 0; | |
1016 | RTA_PUT(skb, TCA_KIND, IFNAMSIZ, q->ops->id); | |
1017 | if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0) | |
1018 | goto rtattr_failure; | |
1019 | ||
1020 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, | |
1021 | TCA_XSTATS, q->stats_lock, &d) < 0) | |
1022 | goto rtattr_failure; | |
1023 | ||
1024 | if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0) | |
1025 | goto rtattr_failure; | |
1026 | ||
1027 | if (gnet_stats_finish_copy(&d) < 0) | |
1028 | goto rtattr_failure; | |
1029 | ||
1030 | nlh->nlmsg_len = skb->tail - b; | |
1031 | return skb->len; | |
1032 | ||
1033 | nlmsg_failure: | |
1034 | rtattr_failure: | |
1035 | skb_trim(skb, b - skb->data); | |
1036 | return -1; | |
1037 | } | |
1038 | ||
1039 | static int tclass_notify(struct sk_buff *oskb, struct nlmsghdr *n, | |
1040 | struct Qdisc *q, unsigned long cl, int event) | |
1041 | { | |
1042 | struct sk_buff *skb; | |
1043 | u32 pid = oskb ? NETLINK_CB(oskb).pid : 0; | |
1044 | ||
1045 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1046 | if (!skb) | |
1047 | return -ENOBUFS; | |
1048 | ||
1049 | if (tc_fill_tclass(skb, q, cl, pid, n->nlmsg_seq, 0, event) < 0) { | |
1050 | kfree_skb(skb); | |
1051 | return -EINVAL; | |
1052 | } | |
1053 | ||
1054 | return rtnetlink_send(skb, pid, RTMGRP_TC, n->nlmsg_flags&NLM_F_ECHO); | |
1055 | } | |
1056 | ||
1057 | struct qdisc_dump_args | |
1058 | { | |
1059 | struct qdisc_walker w; | |
1060 | struct sk_buff *skb; | |
1061 | struct netlink_callback *cb; | |
1062 | }; | |
1063 | ||
1064 | static int qdisc_class_dump(struct Qdisc *q, unsigned long cl, struct qdisc_walker *arg) | |
1065 | { | |
1066 | struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg; | |
1067 | ||
1068 | return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).pid, | |
1069 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTCLASS); | |
1070 | } | |
1071 | ||
1072 | static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb) | |
1073 | { | |
1074 | int t; | |
1075 | int s_t; | |
1076 | struct net_device *dev; | |
1077 | struct Qdisc *q; | |
1078 | struct tcmsg *tcm = (struct tcmsg*)NLMSG_DATA(cb->nlh); | |
1079 | struct qdisc_dump_args arg; | |
1080 | ||
1081 | if (cb->nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*tcm))) | |
1082 | return 0; | |
1083 | if ((dev = dev_get_by_index(tcm->tcm_ifindex)) == NULL) | |
1084 | return 0; | |
1085 | ||
1086 | s_t = cb->args[0]; | |
1087 | t = 0; | |
1088 | ||
1089 | read_lock_bh(&qdisc_tree_lock); | |
1090 | list_for_each_entry(q, &dev->qdisc_list, list) { | |
1091 | if (t < s_t || !q->ops->cl_ops || | |
1092 | (tcm->tcm_parent && | |
1093 | TC_H_MAJ(tcm->tcm_parent) != q->handle)) { | |
1094 | t++; | |
1095 | continue; | |
1096 | } | |
1097 | if (t > s_t) | |
1098 | memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0])); | |
1099 | arg.w.fn = qdisc_class_dump; | |
1100 | arg.skb = skb; | |
1101 | arg.cb = cb; | |
1102 | arg.w.stop = 0; | |
1103 | arg.w.skip = cb->args[1]; | |
1104 | arg.w.count = 0; | |
1105 | q->ops->cl_ops->walk(q, &arg.w); | |
1106 | cb->args[1] = arg.w.count; | |
1107 | if (arg.w.stop) | |
1108 | break; | |
1109 | t++; | |
1110 | } | |
1111 | read_unlock_bh(&qdisc_tree_lock); | |
1112 | ||
1113 | cb->args[0] = t; | |
1114 | ||
1115 | dev_put(dev); | |
1116 | return skb->len; | |
1117 | } | |
1118 | ||
1119 | /* Main classifier routine: scans classifier chain attached | |
1120 | to this qdisc, (optionally) tests for protocol and asks | |
1121 | specific classifiers. | |
1122 | */ | |
1123 | int tc_classify(struct sk_buff *skb, struct tcf_proto *tp, | |
1124 | struct tcf_result *res) | |
1125 | { | |
1126 | int err = 0; | |
1127 | u32 protocol = skb->protocol; | |
1128 | #ifdef CONFIG_NET_CLS_ACT | |
1129 | struct tcf_proto *otp = tp; | |
1130 | reclassify: | |
1131 | #endif | |
1132 | protocol = skb->protocol; | |
1133 | ||
1134 | for ( ; tp; tp = tp->next) { | |
1135 | if ((tp->protocol == protocol || | |
1136 | tp->protocol == __constant_htons(ETH_P_ALL)) && | |
1137 | (err = tp->classify(skb, tp, res)) >= 0) { | |
1138 | #ifdef CONFIG_NET_CLS_ACT | |
1139 | if ( TC_ACT_RECLASSIFY == err) { | |
1140 | __u32 verd = (__u32) G_TC_VERD(skb->tc_verd); | |
1141 | tp = otp; | |
1142 | ||
1143 | if (MAX_REC_LOOP < verd++) { | |
1144 | printk("rule prio %d protocol %02x reclassify is buggy packet dropped\n", | |
1145 | tp->prio&0xffff, ntohs(tp->protocol)); | |
1146 | return TC_ACT_SHOT; | |
1147 | } | |
1148 | skb->tc_verd = SET_TC_VERD(skb->tc_verd,verd); | |
1149 | goto reclassify; | |
1150 | } else { | |
1151 | if (skb->tc_verd) | |
1152 | skb->tc_verd = SET_TC_VERD(skb->tc_verd,0); | |
1153 | return err; | |
1154 | } | |
1155 | #else | |
1156 | ||
1157 | return err; | |
1158 | #endif | |
1159 | } | |
1160 | ||
1161 | } | |
1162 | return -1; | |
1163 | } | |
1164 | ||
1165 | static int psched_us_per_tick = 1; | |
1166 | static int psched_tick_per_us = 1; | |
1167 | ||
1168 | #ifdef CONFIG_PROC_FS | |
1169 | static int psched_show(struct seq_file *seq, void *v) | |
1170 | { | |
1171 | seq_printf(seq, "%08x %08x %08x %08x\n", | |
1172 | psched_tick_per_us, psched_us_per_tick, | |
1173 | 1000000, HZ); | |
1174 | ||
1175 | return 0; | |
1176 | } | |
1177 | ||
1178 | static int psched_open(struct inode *inode, struct file *file) | |
1179 | { | |
1180 | return single_open(file, psched_show, PDE(inode)->data); | |
1181 | } | |
1182 | ||
1183 | static struct file_operations psched_fops = { | |
1184 | .owner = THIS_MODULE, | |
1185 | .open = psched_open, | |
1186 | .read = seq_read, | |
1187 | .llseek = seq_lseek, | |
1188 | .release = single_release, | |
1189 | }; | |
1190 | #endif | |
1191 | ||
1192 | #ifdef CONFIG_NET_SCH_CLK_CPU | |
1193 | psched_tdiff_t psched_clock_per_hz; | |
1194 | int psched_clock_scale; | |
1195 | EXPORT_SYMBOL(psched_clock_per_hz); | |
1196 | EXPORT_SYMBOL(psched_clock_scale); | |
1197 | ||
1198 | psched_time_t psched_time_base; | |
1199 | cycles_t psched_time_mark; | |
1200 | EXPORT_SYMBOL(psched_time_mark); | |
1201 | EXPORT_SYMBOL(psched_time_base); | |
1202 | ||
1203 | /* | |
1204 | * Periodically adjust psched_time_base to avoid overflow | |
1205 | * with 32-bit get_cycles(). Safe up to 4GHz CPU. | |
1206 | */ | |
1207 | static void psched_tick(unsigned long); | |
1208 | static struct timer_list psched_timer = TIMER_INITIALIZER(psched_tick, 0, 0); | |
1209 | ||
1210 | static void psched_tick(unsigned long dummy) | |
1211 | { | |
1212 | if (sizeof(cycles_t) == sizeof(u32)) { | |
1213 | psched_time_t dummy_stamp; | |
1214 | PSCHED_GET_TIME(dummy_stamp); | |
1215 | psched_timer.expires = jiffies + 1*HZ; | |
1216 | add_timer(&psched_timer); | |
1217 | } | |
1218 | } | |
1219 | ||
1220 | int __init psched_calibrate_clock(void) | |
1221 | { | |
1222 | psched_time_t stamp, stamp1; | |
1223 | struct timeval tv, tv1; | |
1224 | psched_tdiff_t delay; | |
1225 | long rdelay; | |
1226 | unsigned long stop; | |
1227 | ||
1228 | psched_tick(0); | |
1229 | stop = jiffies + HZ/10; | |
1230 | PSCHED_GET_TIME(stamp); | |
1231 | do_gettimeofday(&tv); | |
1232 | while (time_before(jiffies, stop)) { | |
1233 | barrier(); | |
1234 | cpu_relax(); | |
1235 | } | |
1236 | PSCHED_GET_TIME(stamp1); | |
1237 | do_gettimeofday(&tv1); | |
1238 | ||
1239 | delay = PSCHED_TDIFF(stamp1, stamp); | |
1240 | rdelay = tv1.tv_usec - tv.tv_usec; | |
1241 | rdelay += (tv1.tv_sec - tv.tv_sec)*1000000; | |
1242 | if (rdelay > delay) | |
1243 | return -1; | |
1244 | delay /= rdelay; | |
1245 | psched_tick_per_us = delay; | |
1246 | while ((delay>>=1) != 0) | |
1247 | psched_clock_scale++; | |
1248 | psched_us_per_tick = 1<<psched_clock_scale; | |
1249 | psched_clock_per_hz = (psched_tick_per_us*(1000000/HZ))>>psched_clock_scale; | |
1250 | return 0; | |
1251 | } | |
1252 | #endif | |
1253 | ||
1254 | static int __init pktsched_init(void) | |
1255 | { | |
1256 | struct rtnetlink_link *link_p; | |
1257 | ||
1258 | #ifdef CONFIG_NET_SCH_CLK_CPU | |
1259 | if (psched_calibrate_clock() < 0) | |
1260 | return -1; | |
1261 | #elif defined(CONFIG_NET_SCH_CLK_JIFFIES) | |
1262 | psched_tick_per_us = HZ<<PSCHED_JSCALE; | |
1263 | psched_us_per_tick = 1000000; | |
1264 | #endif | |
1265 | ||
1266 | link_p = rtnetlink_links[PF_UNSPEC]; | |
1267 | ||
1268 | /* Setup rtnetlink links. It is made here to avoid | |
1269 | exporting large number of public symbols. | |
1270 | */ | |
1271 | ||
1272 | if (link_p) { | |
1273 | link_p[RTM_NEWQDISC-RTM_BASE].doit = tc_modify_qdisc; | |
1274 | link_p[RTM_DELQDISC-RTM_BASE].doit = tc_get_qdisc; | |
1275 | link_p[RTM_GETQDISC-RTM_BASE].doit = tc_get_qdisc; | |
1276 | link_p[RTM_GETQDISC-RTM_BASE].dumpit = tc_dump_qdisc; | |
1277 | link_p[RTM_NEWTCLASS-RTM_BASE].doit = tc_ctl_tclass; | |
1278 | link_p[RTM_DELTCLASS-RTM_BASE].doit = tc_ctl_tclass; | |
1279 | link_p[RTM_GETTCLASS-RTM_BASE].doit = tc_ctl_tclass; | |
1280 | link_p[RTM_GETTCLASS-RTM_BASE].dumpit = tc_dump_tclass; | |
1281 | } | |
1282 | ||
1283 | register_qdisc(&pfifo_qdisc_ops); | |
1284 | register_qdisc(&bfifo_qdisc_ops); | |
1285 | proc_net_fops_create("psched", 0, &psched_fops); | |
1286 | ||
1287 | return 0; | |
1288 | } | |
1289 | ||
1290 | subsys_initcall(pktsched_init); | |
1291 | ||
1292 | EXPORT_SYMBOL(qdisc_get_rtab); | |
1293 | EXPORT_SYMBOL(qdisc_put_rtab); | |
1294 | EXPORT_SYMBOL(register_qdisc); | |
1295 | EXPORT_SYMBOL(unregister_qdisc); | |
1296 | EXPORT_SYMBOL(tc_classify); |