Commit | Line | Data |
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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 | ||
1da177e4 LT |
18 | #include <linux/module.h> |
19 | #include <linux/types.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/sched.h> | |
22 | #include <linux/string.h> | |
23 | #include <linux/mm.h> | |
24 | #include <linux/socket.h> | |
25 | #include <linux/sockios.h> | |
26 | #include <linux/in.h> | |
27 | #include <linux/errno.h> | |
28 | #include <linux/interrupt.h> | |
29 | #include <linux/netdevice.h> | |
30 | #include <linux/skbuff.h> | |
31 | #include <linux/rtnetlink.h> | |
32 | #include <linux/init.h> | |
33 | #include <linux/proc_fs.h> | |
34 | #include <linux/seq_file.h> | |
35 | #include <linux/kmod.h> | |
36 | #include <linux/list.h> | |
37 | #include <linux/bitops.h> | |
38 | ||
39 | #include <net/sock.h> | |
40 | #include <net/pkt_sched.h> | |
41 | ||
42 | #include <asm/processor.h> | |
43 | #include <asm/uaccess.h> | |
44 | #include <asm/system.h> | |
45 | ||
46 | static int qdisc_notify(struct sk_buff *oskb, struct nlmsghdr *n, u32 clid, | |
47 | struct Qdisc *old, struct Qdisc *new); | |
48 | static int tclass_notify(struct sk_buff *oskb, struct nlmsghdr *n, | |
49 | struct Qdisc *q, unsigned long cl, int event); | |
50 | ||
51 | /* | |
52 | ||
53 | Short review. | |
54 | ------------- | |
55 | ||
56 | This file consists of two interrelated parts: | |
57 | ||
58 | 1. queueing disciplines manager frontend. | |
59 | 2. traffic classes manager frontend. | |
60 | ||
61 | Generally, queueing discipline ("qdisc") is a black box, | |
62 | which is able to enqueue packets and to dequeue them (when | |
63 | device is ready to send something) in order and at times | |
64 | determined by algorithm hidden in it. | |
65 | ||
66 | qdisc's are divided to two categories: | |
67 | - "queues", which have no internal structure visible from outside. | |
68 | - "schedulers", which split all the packets to "traffic classes", | |
69 | using "packet classifiers" (look at cls_api.c) | |
70 | ||
71 | In turn, classes may have child qdiscs (as rule, queues) | |
72 | attached to them etc. etc. etc. | |
73 | ||
74 | The goal of the routines in this file is to translate | |
75 | information supplied by user in the form of handles | |
76 | to more intelligible for kernel form, to make some sanity | |
77 | checks and part of work, which is common to all qdiscs | |
78 | and to provide rtnetlink notifications. | |
79 | ||
80 | All real intelligent work is done inside qdisc modules. | |
81 | ||
82 | ||
83 | ||
84 | Every discipline has two major routines: enqueue and dequeue. | |
85 | ||
86 | ---dequeue | |
87 | ||
88 | dequeue usually returns a skb to send. It is allowed to return NULL, | |
89 | but it does not mean that queue is empty, it just means that | |
90 | discipline does not want to send anything this time. | |
91 | Queue is really empty if q->q.qlen == 0. | |
92 | For complicated disciplines with multiple queues q->q is not | |
93 | real packet queue, but however q->q.qlen must be valid. | |
94 | ||
95 | ---enqueue | |
96 | ||
97 | enqueue returns 0, if packet was enqueued successfully. | |
98 | If packet (this one or another one) was dropped, it returns | |
99 | not zero error code. | |
100 | NET_XMIT_DROP - this packet dropped | |
101 | Expected action: do not backoff, but wait until queue will clear. | |
102 | NET_XMIT_CN - probably this packet enqueued, but another one dropped. | |
103 | Expected action: backoff or ignore | |
104 | NET_XMIT_POLICED - dropped by police. | |
105 | Expected action: backoff or error to real-time apps. | |
106 | ||
107 | Auxiliary routines: | |
108 | ||
109 | ---requeue | |
110 | ||
111 | requeues once dequeued packet. It is used for non-standard or | |
112 | just buggy devices, which can defer output even if dev->tbusy=0. | |
113 | ||
114 | ---reset | |
115 | ||
116 | returns qdisc to initial state: purge all buffers, clear all | |
117 | timers, counters (except for statistics) etc. | |
118 | ||
119 | ---init | |
120 | ||
121 | initializes newly created qdisc. | |
122 | ||
123 | ---destroy | |
124 | ||
125 | destroys resources allocated by init and during lifetime of qdisc. | |
126 | ||
127 | ---change | |
128 | ||
129 | changes qdisc parameters. | |
130 | */ | |
131 | ||
132 | /* Protects list of registered TC modules. It is pure SMP lock. */ | |
133 | static DEFINE_RWLOCK(qdisc_mod_lock); | |
134 | ||
135 | ||
136 | /************************************************ | |
137 | * Queueing disciplines manipulation. * | |
138 | ************************************************/ | |
139 | ||
140 | ||
141 | /* The list of all installed queueing disciplines. */ | |
142 | ||
143 | static struct Qdisc_ops *qdisc_base; | |
144 | ||
145 | /* Register/uregister queueing discipline */ | |
146 | ||
147 | int register_qdisc(struct Qdisc_ops *qops) | |
148 | { | |
149 | struct Qdisc_ops *q, **qp; | |
150 | int rc = -EEXIST; | |
151 | ||
152 | write_lock(&qdisc_mod_lock); | |
153 | for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next) | |
154 | if (!strcmp(qops->id, q->id)) | |
155 | goto out; | |
156 | ||
157 | if (qops->enqueue == NULL) | |
158 | qops->enqueue = noop_qdisc_ops.enqueue; | |
159 | if (qops->requeue == NULL) | |
160 | qops->requeue = noop_qdisc_ops.requeue; | |
161 | if (qops->dequeue == NULL) | |
162 | qops->dequeue = noop_qdisc_ops.dequeue; | |
163 | ||
164 | qops->next = NULL; | |
165 | *qp = qops; | |
166 | rc = 0; | |
167 | out: | |
168 | write_unlock(&qdisc_mod_lock); | |
169 | return rc; | |
170 | } | |
171 | ||
172 | int unregister_qdisc(struct Qdisc_ops *qops) | |
173 | { | |
174 | struct Qdisc_ops *q, **qp; | |
175 | int err = -ENOENT; | |
176 | ||
177 | write_lock(&qdisc_mod_lock); | |
178 | for (qp = &qdisc_base; (q=*qp)!=NULL; qp = &q->next) | |
179 | if (q == qops) | |
180 | break; | |
181 | if (q) { | |
182 | *qp = q->next; | |
183 | q->next = NULL; | |
184 | err = 0; | |
185 | } | |
186 | write_unlock(&qdisc_mod_lock); | |
187 | return err; | |
188 | } | |
189 | ||
190 | /* We know handle. Find qdisc among all qdisc's attached to device | |
191 | (root qdisc, all its children, children of children etc.) | |
192 | */ | |
193 | ||
194 | struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle) | |
195 | { | |
196 | struct Qdisc *q; | |
197 | ||
85670cc1 | 198 | read_lock(&qdisc_tree_lock); |
1da177e4 LT |
199 | list_for_each_entry(q, &dev->qdisc_list, list) { |
200 | if (q->handle == handle) { | |
85670cc1 | 201 | read_unlock(&qdisc_tree_lock); |
1da177e4 LT |
202 | return q; |
203 | } | |
204 | } | |
85670cc1 | 205 | read_unlock(&qdisc_tree_lock); |
1da177e4 LT |
206 | return NULL; |
207 | } | |
208 | ||
209 | static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid) | |
210 | { | |
211 | unsigned long cl; | |
212 | struct Qdisc *leaf; | |
213 | struct Qdisc_class_ops *cops = p->ops->cl_ops; | |
214 | ||
215 | if (cops == NULL) | |
216 | return NULL; | |
217 | cl = cops->get(p, classid); | |
218 | ||
219 | if (cl == 0) | |
220 | return NULL; | |
221 | leaf = cops->leaf(p, cl); | |
222 | cops->put(p, cl); | |
223 | return leaf; | |
224 | } | |
225 | ||
226 | /* Find queueing discipline by name */ | |
227 | ||
228 | static struct Qdisc_ops *qdisc_lookup_ops(struct rtattr *kind) | |
229 | { | |
230 | struct Qdisc_ops *q = NULL; | |
231 | ||
232 | if (kind) { | |
233 | read_lock(&qdisc_mod_lock); | |
234 | for (q = qdisc_base; q; q = q->next) { | |
235 | if (rtattr_strcmp(kind, q->id) == 0) { | |
236 | if (!try_module_get(q->owner)) | |
237 | q = NULL; | |
238 | break; | |
239 | } | |
240 | } | |
241 | read_unlock(&qdisc_mod_lock); | |
242 | } | |
243 | return q; | |
244 | } | |
245 | ||
246 | static struct qdisc_rate_table *qdisc_rtab_list; | |
247 | ||
248 | struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, struct rtattr *tab) | |
249 | { | |
250 | struct qdisc_rate_table *rtab; | |
251 | ||
252 | for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) { | |
253 | if (memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) == 0) { | |
254 | rtab->refcnt++; | |
255 | return rtab; | |
256 | } | |
257 | } | |
258 | ||
259 | if (tab == NULL || r->rate == 0 || r->cell_log == 0 || RTA_PAYLOAD(tab) != 1024) | |
260 | return NULL; | |
261 | ||
262 | rtab = kmalloc(sizeof(*rtab), GFP_KERNEL); | |
263 | if (rtab) { | |
264 | rtab->rate = *r; | |
265 | rtab->refcnt = 1; | |
266 | memcpy(rtab->data, RTA_DATA(tab), 1024); | |
267 | rtab->next = qdisc_rtab_list; | |
268 | qdisc_rtab_list = rtab; | |
269 | } | |
270 | return rtab; | |
271 | } | |
272 | ||
273 | void qdisc_put_rtab(struct qdisc_rate_table *tab) | |
274 | { | |
275 | struct qdisc_rate_table *rtab, **rtabp; | |
276 | ||
277 | if (!tab || --tab->refcnt) | |
278 | return; | |
279 | ||
280 | for (rtabp = &qdisc_rtab_list; (rtab=*rtabp) != NULL; rtabp = &rtab->next) { | |
281 | if (rtab == tab) { | |
282 | *rtabp = rtab->next; | |
283 | kfree(rtab); | |
284 | return; | |
285 | } | |
286 | } | |
287 | } | |
288 | ||
289 | ||
290 | /* Allocate an unique handle from space managed by kernel */ | |
291 | ||
292 | static u32 qdisc_alloc_handle(struct net_device *dev) | |
293 | { | |
294 | int i = 0x10000; | |
295 | static u32 autohandle = TC_H_MAKE(0x80000000U, 0); | |
296 | ||
297 | do { | |
298 | autohandle += TC_H_MAKE(0x10000U, 0); | |
299 | if (autohandle == TC_H_MAKE(TC_H_ROOT, 0)) | |
300 | autohandle = TC_H_MAKE(0x80000000U, 0); | |
301 | } while (qdisc_lookup(dev, autohandle) && --i > 0); | |
302 | ||
303 | return i>0 ? autohandle : 0; | |
304 | } | |
305 | ||
306 | /* Attach toplevel qdisc to device dev */ | |
307 | ||
308 | static struct Qdisc * | |
309 | dev_graft_qdisc(struct net_device *dev, struct Qdisc *qdisc) | |
310 | { | |
311 | struct Qdisc *oqdisc; | |
312 | ||
313 | if (dev->flags & IFF_UP) | |
314 | dev_deactivate(dev); | |
315 | ||
316 | qdisc_lock_tree(dev); | |
317 | if (qdisc && qdisc->flags&TCQ_F_INGRESS) { | |
318 | oqdisc = dev->qdisc_ingress; | |
319 | /* Prune old scheduler */ | |
320 | if (oqdisc && atomic_read(&oqdisc->refcnt) <= 1) { | |
321 | /* delete */ | |
322 | qdisc_reset(oqdisc); | |
323 | dev->qdisc_ingress = NULL; | |
324 | } else { /* new */ | |
325 | dev->qdisc_ingress = qdisc; | |
326 | } | |
327 | ||
328 | } else { | |
329 | ||
330 | oqdisc = dev->qdisc_sleeping; | |
331 | ||
332 | /* Prune old scheduler */ | |
333 | if (oqdisc && atomic_read(&oqdisc->refcnt) <= 1) | |
334 | qdisc_reset(oqdisc); | |
335 | ||
336 | /* ... and graft new one */ | |
337 | if (qdisc == NULL) | |
338 | qdisc = &noop_qdisc; | |
339 | dev->qdisc_sleeping = qdisc; | |
340 | dev->qdisc = &noop_qdisc; | |
341 | } | |
342 | ||
343 | qdisc_unlock_tree(dev); | |
344 | ||
345 | if (dev->flags & IFF_UP) | |
346 | dev_activate(dev); | |
347 | ||
348 | return oqdisc; | |
349 | } | |
350 | ||
351 | ||
352 | /* Graft qdisc "new" to class "classid" of qdisc "parent" or | |
353 | to device "dev". | |
354 | ||
355 | Old qdisc is not destroyed but returned in *old. | |
356 | */ | |
357 | ||
358 | static int qdisc_graft(struct net_device *dev, struct Qdisc *parent, | |
359 | u32 classid, | |
360 | struct Qdisc *new, struct Qdisc **old) | |
361 | { | |
362 | int err = 0; | |
363 | struct Qdisc *q = *old; | |
364 | ||
365 | ||
366 | if (parent == NULL) { | |
367 | if (q && q->flags&TCQ_F_INGRESS) { | |
368 | *old = dev_graft_qdisc(dev, q); | |
369 | } else { | |
370 | *old = dev_graft_qdisc(dev, new); | |
371 | } | |
372 | } else { | |
373 | struct Qdisc_class_ops *cops = parent->ops->cl_ops; | |
374 | ||
375 | err = -EINVAL; | |
376 | ||
377 | if (cops) { | |
378 | unsigned long cl = cops->get(parent, classid); | |
379 | if (cl) { | |
380 | err = cops->graft(parent, cl, new, old); | |
381 | if (new) | |
382 | new->parent = classid; | |
383 | cops->put(parent, cl); | |
384 | } | |
385 | } | |
386 | } | |
387 | return err; | |
388 | } | |
389 | ||
390 | /* | |
391 | Allocate and initialize new qdisc. | |
392 | ||
393 | Parameters are passed via opt. | |
394 | */ | |
395 | ||
396 | static struct Qdisc * | |
397 | qdisc_create(struct net_device *dev, u32 handle, struct rtattr **tca, int *errp) | |
398 | { | |
399 | int err; | |
400 | struct rtattr *kind = tca[TCA_KIND-1]; | |
1da177e4 LT |
401 | struct Qdisc *sch; |
402 | struct Qdisc_ops *ops; | |
1da177e4 LT |
403 | |
404 | ops = qdisc_lookup_ops(kind); | |
405 | #ifdef CONFIG_KMOD | |
406 | if (ops == NULL && kind != NULL) { | |
407 | char name[IFNAMSIZ]; | |
408 | if (rtattr_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) { | |
409 | /* We dropped the RTNL semaphore in order to | |
410 | * perform the module load. So, even if we | |
411 | * succeeded in loading the module we have to | |
412 | * tell the caller to replay the request. We | |
413 | * indicate this using -EAGAIN. | |
414 | * We replay the request because the device may | |
415 | * go away in the mean time. | |
416 | */ | |
417 | rtnl_unlock(); | |
418 | request_module("sch_%s", name); | |
419 | rtnl_lock(); | |
420 | ops = qdisc_lookup_ops(kind); | |
421 | if (ops != NULL) { | |
422 | /* We will try again qdisc_lookup_ops, | |
423 | * so don't keep a reference. | |
424 | */ | |
425 | module_put(ops->owner); | |
426 | err = -EAGAIN; | |
427 | goto err_out; | |
428 | } | |
429 | } | |
430 | } | |
431 | #endif | |
432 | ||
b9e2cc0f | 433 | err = -ENOENT; |
1da177e4 LT |
434 | if (ops == NULL) |
435 | goto err_out; | |
436 | ||
3d54b82f TG |
437 | sch = qdisc_alloc(dev, ops); |
438 | if (IS_ERR(sch)) { | |
439 | err = PTR_ERR(sch); | |
1da177e4 | 440 | goto err_out2; |
3d54b82f | 441 | } |
1da177e4 | 442 | |
3d54b82f | 443 | if (handle == TC_H_INGRESS) { |
1da177e4 | 444 | sch->flags |= TCQ_F_INGRESS; |
3d54b82f TG |
445 | handle = TC_H_MAKE(TC_H_INGRESS, 0); |
446 | } else if (handle == 0) { | |
1da177e4 LT |
447 | handle = qdisc_alloc_handle(dev); |
448 | err = -ENOMEM; | |
449 | if (handle == 0) | |
450 | goto err_out3; | |
451 | } | |
452 | ||
3d54b82f | 453 | sch->handle = handle; |
1da177e4 LT |
454 | |
455 | if (!ops->init || (err = ops->init(sch, tca[TCA_OPTIONS-1])) == 0) { | |
023e09a7 TG |
456 | #ifdef CONFIG_NET_ESTIMATOR |
457 | if (tca[TCA_RATE-1]) { | |
458 | err = gen_new_estimator(&sch->bstats, &sch->rate_est, | |
459 | sch->stats_lock, | |
460 | tca[TCA_RATE-1]); | |
461 | if (err) { | |
462 | /* | |
463 | * Any broken qdiscs that would require | |
464 | * a ops->reset() here? The qdisc was never | |
465 | * in action so it shouldn't be necessary. | |
466 | */ | |
467 | if (ops->destroy) | |
468 | ops->destroy(sch); | |
469 | goto err_out3; | |
470 | } | |
471 | } | |
472 | #endif | |
1da177e4 LT |
473 | qdisc_lock_tree(dev); |
474 | list_add_tail(&sch->list, &dev->qdisc_list); | |
475 | qdisc_unlock_tree(dev); | |
476 | ||
1da177e4 LT |
477 | return sch; |
478 | } | |
479 | err_out3: | |
480 | dev_put(dev); | |
3d54b82f | 481 | kfree((char *) sch - sch->padded); |
1da177e4 LT |
482 | err_out2: |
483 | module_put(ops->owner); | |
484 | err_out: | |
485 | *errp = err; | |
1da177e4 LT |
486 | return NULL; |
487 | } | |
488 | ||
489 | static int qdisc_change(struct Qdisc *sch, struct rtattr **tca) | |
490 | { | |
491 | if (tca[TCA_OPTIONS-1]) { | |
492 | int err; | |
493 | ||
494 | if (sch->ops->change == NULL) | |
495 | return -EINVAL; | |
496 | err = sch->ops->change(sch, tca[TCA_OPTIONS-1]); | |
497 | if (err) | |
498 | return err; | |
499 | } | |
500 | #ifdef CONFIG_NET_ESTIMATOR | |
501 | if (tca[TCA_RATE-1]) | |
502 | gen_replace_estimator(&sch->bstats, &sch->rate_est, | |
503 | sch->stats_lock, tca[TCA_RATE-1]); | |
504 | #endif | |
505 | return 0; | |
506 | } | |
507 | ||
508 | struct check_loop_arg | |
509 | { | |
510 | struct qdisc_walker w; | |
511 | struct Qdisc *p; | |
512 | int depth; | |
513 | }; | |
514 | ||
515 | static int check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w); | |
516 | ||
517 | static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth) | |
518 | { | |
519 | struct check_loop_arg arg; | |
520 | ||
521 | if (q->ops->cl_ops == NULL) | |
522 | return 0; | |
523 | ||
524 | arg.w.stop = arg.w.skip = arg.w.count = 0; | |
525 | arg.w.fn = check_loop_fn; | |
526 | arg.depth = depth; | |
527 | arg.p = p; | |
528 | q->ops->cl_ops->walk(q, &arg.w); | |
529 | return arg.w.stop ? -ELOOP : 0; | |
530 | } | |
531 | ||
532 | static int | |
533 | check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w) | |
534 | { | |
535 | struct Qdisc *leaf; | |
536 | struct Qdisc_class_ops *cops = q->ops->cl_ops; | |
537 | struct check_loop_arg *arg = (struct check_loop_arg *)w; | |
538 | ||
539 | leaf = cops->leaf(q, cl); | |
540 | if (leaf) { | |
541 | if (leaf == arg->p || arg->depth > 7) | |
542 | return -ELOOP; | |
543 | return check_loop(leaf, arg->p, arg->depth + 1); | |
544 | } | |
545 | return 0; | |
546 | } | |
547 | ||
548 | /* | |
549 | * Delete/get qdisc. | |
550 | */ | |
551 | ||
552 | static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
553 | { | |
554 | struct tcmsg *tcm = NLMSG_DATA(n); | |
555 | struct rtattr **tca = arg; | |
556 | struct net_device *dev; | |
557 | u32 clid = tcm->tcm_parent; | |
558 | struct Qdisc *q = NULL; | |
559 | struct Qdisc *p = NULL; | |
560 | int err; | |
561 | ||
562 | if ((dev = __dev_get_by_index(tcm->tcm_ifindex)) == NULL) | |
563 | return -ENODEV; | |
564 | ||
565 | if (clid) { | |
566 | if (clid != TC_H_ROOT) { | |
567 | if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) { | |
568 | if ((p = qdisc_lookup(dev, TC_H_MAJ(clid))) == NULL) | |
569 | return -ENOENT; | |
570 | q = qdisc_leaf(p, clid); | |
571 | } else { /* ingress */ | |
572 | q = dev->qdisc_ingress; | |
573 | } | |
574 | } else { | |
575 | q = dev->qdisc_sleeping; | |
576 | } | |
577 | if (!q) | |
578 | return -ENOENT; | |
579 | ||
580 | if (tcm->tcm_handle && q->handle != tcm->tcm_handle) | |
581 | return -EINVAL; | |
582 | } else { | |
583 | if ((q = qdisc_lookup(dev, tcm->tcm_handle)) == NULL) | |
584 | return -ENOENT; | |
585 | } | |
586 | ||
587 | if (tca[TCA_KIND-1] && rtattr_strcmp(tca[TCA_KIND-1], q->ops->id)) | |
588 | return -EINVAL; | |
589 | ||
590 | if (n->nlmsg_type == RTM_DELQDISC) { | |
591 | if (!clid) | |
592 | return -EINVAL; | |
593 | if (q->handle == 0) | |
594 | return -ENOENT; | |
595 | if ((err = qdisc_graft(dev, p, clid, NULL, &q)) != 0) | |
596 | return err; | |
597 | if (q) { | |
598 | qdisc_notify(skb, n, clid, q, NULL); | |
599 | spin_lock_bh(&dev->queue_lock); | |
600 | qdisc_destroy(q); | |
601 | spin_unlock_bh(&dev->queue_lock); | |
602 | } | |
603 | } else { | |
604 | qdisc_notify(skb, n, clid, NULL, q); | |
605 | } | |
606 | return 0; | |
607 | } | |
608 | ||
609 | /* | |
610 | Create/change qdisc. | |
611 | */ | |
612 | ||
613 | static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
614 | { | |
615 | struct tcmsg *tcm; | |
616 | struct rtattr **tca; | |
617 | struct net_device *dev; | |
618 | u32 clid; | |
619 | struct Qdisc *q, *p; | |
620 | int err; | |
621 | ||
622 | replay: | |
623 | /* Reinit, just in case something touches this. */ | |
624 | tcm = NLMSG_DATA(n); | |
625 | tca = arg; | |
626 | clid = tcm->tcm_parent; | |
627 | q = p = NULL; | |
628 | ||
629 | if ((dev = __dev_get_by_index(tcm->tcm_ifindex)) == NULL) | |
630 | return -ENODEV; | |
631 | ||
632 | if (clid) { | |
633 | if (clid != TC_H_ROOT) { | |
634 | if (clid != TC_H_INGRESS) { | |
635 | if ((p = qdisc_lookup(dev, TC_H_MAJ(clid))) == NULL) | |
636 | return -ENOENT; | |
637 | q = qdisc_leaf(p, clid); | |
638 | } else { /*ingress */ | |
639 | q = dev->qdisc_ingress; | |
640 | } | |
641 | } else { | |
642 | q = dev->qdisc_sleeping; | |
643 | } | |
644 | ||
645 | /* It may be default qdisc, ignore it */ | |
646 | if (q && q->handle == 0) | |
647 | q = NULL; | |
648 | ||
649 | if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) { | |
650 | if (tcm->tcm_handle) { | |
651 | if (q && !(n->nlmsg_flags&NLM_F_REPLACE)) | |
652 | return -EEXIST; | |
653 | if (TC_H_MIN(tcm->tcm_handle)) | |
654 | return -EINVAL; | |
655 | if ((q = qdisc_lookup(dev, tcm->tcm_handle)) == NULL) | |
656 | goto create_n_graft; | |
657 | if (n->nlmsg_flags&NLM_F_EXCL) | |
658 | return -EEXIST; | |
659 | if (tca[TCA_KIND-1] && rtattr_strcmp(tca[TCA_KIND-1], q->ops->id)) | |
660 | return -EINVAL; | |
661 | if (q == p || | |
662 | (p && check_loop(q, p, 0))) | |
663 | return -ELOOP; | |
664 | atomic_inc(&q->refcnt); | |
665 | goto graft; | |
666 | } else { | |
667 | if (q == NULL) | |
668 | goto create_n_graft; | |
669 | ||
670 | /* This magic test requires explanation. | |
671 | * | |
672 | * We know, that some child q is already | |
673 | * attached to this parent and have choice: | |
674 | * either to change it or to create/graft new one. | |
675 | * | |
676 | * 1. We are allowed to create/graft only | |
677 | * if CREATE and REPLACE flags are set. | |
678 | * | |
679 | * 2. If EXCL is set, requestor wanted to say, | |
680 | * that qdisc tcm_handle is not expected | |
681 | * to exist, so that we choose create/graft too. | |
682 | * | |
683 | * 3. The last case is when no flags are set. | |
684 | * Alas, it is sort of hole in API, we | |
685 | * cannot decide what to do unambiguously. | |
686 | * For now we select create/graft, if | |
687 | * user gave KIND, which does not match existing. | |
688 | */ | |
689 | if ((n->nlmsg_flags&NLM_F_CREATE) && | |
690 | (n->nlmsg_flags&NLM_F_REPLACE) && | |
691 | ((n->nlmsg_flags&NLM_F_EXCL) || | |
692 | (tca[TCA_KIND-1] && | |
693 | rtattr_strcmp(tca[TCA_KIND-1], q->ops->id)))) | |
694 | goto create_n_graft; | |
695 | } | |
696 | } | |
697 | } else { | |
698 | if (!tcm->tcm_handle) | |
699 | return -EINVAL; | |
700 | q = qdisc_lookup(dev, tcm->tcm_handle); | |
701 | } | |
702 | ||
703 | /* Change qdisc parameters */ | |
704 | if (q == NULL) | |
705 | return -ENOENT; | |
706 | if (n->nlmsg_flags&NLM_F_EXCL) | |
707 | return -EEXIST; | |
708 | if (tca[TCA_KIND-1] && rtattr_strcmp(tca[TCA_KIND-1], q->ops->id)) | |
709 | return -EINVAL; | |
710 | err = qdisc_change(q, tca); | |
711 | if (err == 0) | |
712 | qdisc_notify(skb, n, clid, NULL, q); | |
713 | return err; | |
714 | ||
715 | create_n_graft: | |
716 | if (!(n->nlmsg_flags&NLM_F_CREATE)) | |
717 | return -ENOENT; | |
718 | if (clid == TC_H_INGRESS) | |
719 | q = qdisc_create(dev, tcm->tcm_parent, tca, &err); | |
720 | else | |
721 | q = qdisc_create(dev, tcm->tcm_handle, tca, &err); | |
722 | if (q == NULL) { | |
723 | if (err == -EAGAIN) | |
724 | goto replay; | |
725 | return err; | |
726 | } | |
727 | ||
728 | graft: | |
729 | if (1) { | |
730 | struct Qdisc *old_q = NULL; | |
731 | err = qdisc_graft(dev, p, clid, q, &old_q); | |
732 | if (err) { | |
733 | if (q) { | |
734 | spin_lock_bh(&dev->queue_lock); | |
735 | qdisc_destroy(q); | |
736 | spin_unlock_bh(&dev->queue_lock); | |
737 | } | |
738 | return err; | |
739 | } | |
740 | qdisc_notify(skb, n, clid, old_q, q); | |
741 | if (old_q) { | |
742 | spin_lock_bh(&dev->queue_lock); | |
743 | qdisc_destroy(old_q); | |
744 | spin_unlock_bh(&dev->queue_lock); | |
745 | } | |
746 | } | |
747 | return 0; | |
748 | } | |
749 | ||
750 | static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid, | |
e431b8c0 | 751 | u32 pid, u32 seq, u16 flags, int event) |
1da177e4 LT |
752 | { |
753 | struct tcmsg *tcm; | |
754 | struct nlmsghdr *nlh; | |
755 | unsigned char *b = skb->tail; | |
756 | struct gnet_dump d; | |
757 | ||
e431b8c0 | 758 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags); |
1da177e4 LT |
759 | tcm = NLMSG_DATA(nlh); |
760 | tcm->tcm_family = AF_UNSPEC; | |
9ef1d4c7 PM |
761 | tcm->tcm__pad1 = 0; |
762 | tcm->tcm__pad2 = 0; | |
1da177e4 LT |
763 | tcm->tcm_ifindex = q->dev->ifindex; |
764 | tcm->tcm_parent = clid; | |
765 | tcm->tcm_handle = q->handle; | |
766 | tcm->tcm_info = atomic_read(&q->refcnt); | |
767 | RTA_PUT(skb, TCA_KIND, IFNAMSIZ, q->ops->id); | |
768 | if (q->ops->dump && q->ops->dump(q, skb) < 0) | |
769 | goto rtattr_failure; | |
770 | q->qstats.qlen = q->q.qlen; | |
771 | ||
772 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, | |
773 | TCA_XSTATS, q->stats_lock, &d) < 0) | |
774 | goto rtattr_failure; | |
775 | ||
776 | if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0) | |
777 | goto rtattr_failure; | |
778 | ||
779 | if (gnet_stats_copy_basic(&d, &q->bstats) < 0 || | |
780 | #ifdef CONFIG_NET_ESTIMATOR | |
781 | gnet_stats_copy_rate_est(&d, &q->rate_est) < 0 || | |
782 | #endif | |
783 | gnet_stats_copy_queue(&d, &q->qstats) < 0) | |
784 | goto rtattr_failure; | |
785 | ||
786 | if (gnet_stats_finish_copy(&d) < 0) | |
787 | goto rtattr_failure; | |
788 | ||
789 | nlh->nlmsg_len = skb->tail - b; | |
790 | return skb->len; | |
791 | ||
792 | nlmsg_failure: | |
793 | rtattr_failure: | |
794 | skb_trim(skb, b - skb->data); | |
795 | return -1; | |
796 | } | |
797 | ||
798 | static int qdisc_notify(struct sk_buff *oskb, struct nlmsghdr *n, | |
799 | u32 clid, struct Qdisc *old, struct Qdisc *new) | |
800 | { | |
801 | struct sk_buff *skb; | |
802 | u32 pid = oskb ? NETLINK_CB(oskb).pid : 0; | |
803 | ||
804 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
805 | if (!skb) | |
806 | return -ENOBUFS; | |
807 | ||
808 | if (old && old->handle) { | |
809 | if (tc_fill_qdisc(skb, old, clid, pid, n->nlmsg_seq, 0, RTM_DELQDISC) < 0) | |
810 | goto err_out; | |
811 | } | |
812 | if (new) { | |
813 | if (tc_fill_qdisc(skb, new, clid, pid, n->nlmsg_seq, old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0) | |
814 | goto err_out; | |
815 | } | |
816 | ||
817 | if (skb->len) | |
ac6d439d | 818 | return rtnetlink_send(skb, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO); |
1da177e4 LT |
819 | |
820 | err_out: | |
821 | kfree_skb(skb); | |
822 | return -EINVAL; | |
823 | } | |
824 | ||
825 | static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb) | |
826 | { | |
827 | int idx, q_idx; | |
828 | int s_idx, s_q_idx; | |
829 | struct net_device *dev; | |
830 | struct Qdisc *q; | |
831 | ||
832 | s_idx = cb->args[0]; | |
833 | s_q_idx = q_idx = cb->args[1]; | |
834 | read_lock(&dev_base_lock); | |
835 | for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) { | |
836 | if (idx < s_idx) | |
837 | continue; | |
838 | if (idx > s_idx) | |
839 | s_q_idx = 0; | |
85670cc1 | 840 | read_lock(&qdisc_tree_lock); |
1da177e4 LT |
841 | q_idx = 0; |
842 | list_for_each_entry(q, &dev->qdisc_list, list) { | |
843 | if (q_idx < s_q_idx) { | |
844 | q_idx++; | |
845 | continue; | |
846 | } | |
847 | if (tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).pid, | |
848 | cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0) { | |
85670cc1 | 849 | read_unlock(&qdisc_tree_lock); |
1da177e4 LT |
850 | goto done; |
851 | } | |
852 | q_idx++; | |
853 | } | |
85670cc1 | 854 | read_unlock(&qdisc_tree_lock); |
1da177e4 LT |
855 | } |
856 | ||
857 | done: | |
858 | read_unlock(&dev_base_lock); | |
859 | ||
860 | cb->args[0] = idx; | |
861 | cb->args[1] = q_idx; | |
862 | ||
863 | return skb->len; | |
864 | } | |
865 | ||
866 | ||
867 | ||
868 | /************************************************ | |
869 | * Traffic classes manipulation. * | |
870 | ************************************************/ | |
871 | ||
872 | ||
873 | ||
874 | static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
875 | { | |
876 | struct tcmsg *tcm = NLMSG_DATA(n); | |
877 | struct rtattr **tca = arg; | |
878 | struct net_device *dev; | |
879 | struct Qdisc *q = NULL; | |
880 | struct Qdisc_class_ops *cops; | |
881 | unsigned long cl = 0; | |
882 | unsigned long new_cl; | |
883 | u32 pid = tcm->tcm_parent; | |
884 | u32 clid = tcm->tcm_handle; | |
885 | u32 qid = TC_H_MAJ(clid); | |
886 | int err; | |
887 | ||
888 | if ((dev = __dev_get_by_index(tcm->tcm_ifindex)) == NULL) | |
889 | return -ENODEV; | |
890 | ||
891 | /* | |
892 | parent == TC_H_UNSPEC - unspecified parent. | |
893 | parent == TC_H_ROOT - class is root, which has no parent. | |
894 | parent == X:0 - parent is root class. | |
895 | parent == X:Y - parent is a node in hierarchy. | |
896 | parent == 0:Y - parent is X:Y, where X:0 is qdisc. | |
897 | ||
898 | handle == 0:0 - generate handle from kernel pool. | |
899 | handle == 0:Y - class is X:Y, where X:0 is qdisc. | |
900 | handle == X:Y - clear. | |
901 | handle == X:0 - root class. | |
902 | */ | |
903 | ||
904 | /* Step 1. Determine qdisc handle X:0 */ | |
905 | ||
906 | if (pid != TC_H_ROOT) { | |
907 | u32 qid1 = TC_H_MAJ(pid); | |
908 | ||
909 | if (qid && qid1) { | |
910 | /* If both majors are known, they must be identical. */ | |
911 | if (qid != qid1) | |
912 | return -EINVAL; | |
913 | } else if (qid1) { | |
914 | qid = qid1; | |
915 | } else if (qid == 0) | |
916 | qid = dev->qdisc_sleeping->handle; | |
917 | ||
918 | /* Now qid is genuine qdisc handle consistent | |
919 | both with parent and child. | |
920 | ||
921 | TC_H_MAJ(pid) still may be unspecified, complete it now. | |
922 | */ | |
923 | if (pid) | |
924 | pid = TC_H_MAKE(qid, pid); | |
925 | } else { | |
926 | if (qid == 0) | |
927 | qid = dev->qdisc_sleeping->handle; | |
928 | } | |
929 | ||
930 | /* OK. Locate qdisc */ | |
931 | if ((q = qdisc_lookup(dev, qid)) == NULL) | |
932 | return -ENOENT; | |
933 | ||
934 | /* An check that it supports classes */ | |
935 | cops = q->ops->cl_ops; | |
936 | if (cops == NULL) | |
937 | return -EINVAL; | |
938 | ||
939 | /* Now try to get class */ | |
940 | if (clid == 0) { | |
941 | if (pid == TC_H_ROOT) | |
942 | clid = qid; | |
943 | } else | |
944 | clid = TC_H_MAKE(qid, clid); | |
945 | ||
946 | if (clid) | |
947 | cl = cops->get(q, clid); | |
948 | ||
949 | if (cl == 0) { | |
950 | err = -ENOENT; | |
951 | if (n->nlmsg_type != RTM_NEWTCLASS || !(n->nlmsg_flags&NLM_F_CREATE)) | |
952 | goto out; | |
953 | } else { | |
954 | switch (n->nlmsg_type) { | |
955 | case RTM_NEWTCLASS: | |
956 | err = -EEXIST; | |
957 | if (n->nlmsg_flags&NLM_F_EXCL) | |
958 | goto out; | |
959 | break; | |
960 | case RTM_DELTCLASS: | |
961 | err = cops->delete(q, cl); | |
962 | if (err == 0) | |
963 | tclass_notify(skb, n, q, cl, RTM_DELTCLASS); | |
964 | goto out; | |
965 | case RTM_GETTCLASS: | |
966 | err = tclass_notify(skb, n, q, cl, RTM_NEWTCLASS); | |
967 | goto out; | |
968 | default: | |
969 | err = -EINVAL; | |
970 | goto out; | |
971 | } | |
972 | } | |
973 | ||
974 | new_cl = cl; | |
975 | err = cops->change(q, clid, pid, tca, &new_cl); | |
976 | if (err == 0) | |
977 | tclass_notify(skb, n, q, new_cl, RTM_NEWTCLASS); | |
978 | ||
979 | out: | |
980 | if (cl) | |
981 | cops->put(q, cl); | |
982 | ||
983 | return err; | |
984 | } | |
985 | ||
986 | ||
987 | static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q, | |
988 | unsigned long cl, | |
e431b8c0 | 989 | u32 pid, u32 seq, u16 flags, int event) |
1da177e4 LT |
990 | { |
991 | struct tcmsg *tcm; | |
992 | struct nlmsghdr *nlh; | |
993 | unsigned char *b = skb->tail; | |
994 | struct gnet_dump d; | |
995 | struct Qdisc_class_ops *cl_ops = q->ops->cl_ops; | |
996 | ||
e431b8c0 | 997 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags); |
1da177e4 LT |
998 | tcm = NLMSG_DATA(nlh); |
999 | tcm->tcm_family = AF_UNSPEC; | |
1000 | tcm->tcm_ifindex = q->dev->ifindex; | |
1001 | tcm->tcm_parent = q->handle; | |
1002 | tcm->tcm_handle = q->handle; | |
1003 | tcm->tcm_info = 0; | |
1004 | RTA_PUT(skb, TCA_KIND, IFNAMSIZ, q->ops->id); | |
1005 | if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0) | |
1006 | goto rtattr_failure; | |
1007 | ||
1008 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, | |
1009 | TCA_XSTATS, q->stats_lock, &d) < 0) | |
1010 | goto rtattr_failure; | |
1011 | ||
1012 | if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0) | |
1013 | goto rtattr_failure; | |
1014 | ||
1015 | if (gnet_stats_finish_copy(&d) < 0) | |
1016 | goto rtattr_failure; | |
1017 | ||
1018 | nlh->nlmsg_len = skb->tail - b; | |
1019 | return skb->len; | |
1020 | ||
1021 | nlmsg_failure: | |
1022 | rtattr_failure: | |
1023 | skb_trim(skb, b - skb->data); | |
1024 | return -1; | |
1025 | } | |
1026 | ||
1027 | static int tclass_notify(struct sk_buff *oskb, struct nlmsghdr *n, | |
1028 | struct Qdisc *q, unsigned long cl, int event) | |
1029 | { | |
1030 | struct sk_buff *skb; | |
1031 | u32 pid = oskb ? NETLINK_CB(oskb).pid : 0; | |
1032 | ||
1033 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1034 | if (!skb) | |
1035 | return -ENOBUFS; | |
1036 | ||
1037 | if (tc_fill_tclass(skb, q, cl, pid, n->nlmsg_seq, 0, event) < 0) { | |
1038 | kfree_skb(skb); | |
1039 | return -EINVAL; | |
1040 | } | |
1041 | ||
ac6d439d | 1042 | return rtnetlink_send(skb, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO); |
1da177e4 LT |
1043 | } |
1044 | ||
1045 | struct qdisc_dump_args | |
1046 | { | |
1047 | struct qdisc_walker w; | |
1048 | struct sk_buff *skb; | |
1049 | struct netlink_callback *cb; | |
1050 | }; | |
1051 | ||
1052 | static int qdisc_class_dump(struct Qdisc *q, unsigned long cl, struct qdisc_walker *arg) | |
1053 | { | |
1054 | struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg; | |
1055 | ||
1056 | return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).pid, | |
1057 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTCLASS); | |
1058 | } | |
1059 | ||
1060 | static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb) | |
1061 | { | |
1062 | int t; | |
1063 | int s_t; | |
1064 | struct net_device *dev; | |
1065 | struct Qdisc *q; | |
1066 | struct tcmsg *tcm = (struct tcmsg*)NLMSG_DATA(cb->nlh); | |
1067 | struct qdisc_dump_args arg; | |
1068 | ||
1069 | if (cb->nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*tcm))) | |
1070 | return 0; | |
1071 | if ((dev = dev_get_by_index(tcm->tcm_ifindex)) == NULL) | |
1072 | return 0; | |
1073 | ||
1074 | s_t = cb->args[0]; | |
1075 | t = 0; | |
1076 | ||
85670cc1 | 1077 | read_lock(&qdisc_tree_lock); |
1da177e4 LT |
1078 | list_for_each_entry(q, &dev->qdisc_list, list) { |
1079 | if (t < s_t || !q->ops->cl_ops || | |
1080 | (tcm->tcm_parent && | |
1081 | TC_H_MAJ(tcm->tcm_parent) != q->handle)) { | |
1082 | t++; | |
1083 | continue; | |
1084 | } | |
1085 | if (t > s_t) | |
1086 | memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0])); | |
1087 | arg.w.fn = qdisc_class_dump; | |
1088 | arg.skb = skb; | |
1089 | arg.cb = cb; | |
1090 | arg.w.stop = 0; | |
1091 | arg.w.skip = cb->args[1]; | |
1092 | arg.w.count = 0; | |
1093 | q->ops->cl_ops->walk(q, &arg.w); | |
1094 | cb->args[1] = arg.w.count; | |
1095 | if (arg.w.stop) | |
1096 | break; | |
1097 | t++; | |
1098 | } | |
85670cc1 | 1099 | read_unlock(&qdisc_tree_lock); |
1da177e4 LT |
1100 | |
1101 | cb->args[0] = t; | |
1102 | ||
1103 | dev_put(dev); | |
1104 | return skb->len; | |
1105 | } | |
1106 | ||
1107 | /* Main classifier routine: scans classifier chain attached | |
1108 | to this qdisc, (optionally) tests for protocol and asks | |
1109 | specific classifiers. | |
1110 | */ | |
1111 | int tc_classify(struct sk_buff *skb, struct tcf_proto *tp, | |
1112 | struct tcf_result *res) | |
1113 | { | |
1114 | int err = 0; | |
1115 | u32 protocol = skb->protocol; | |
1116 | #ifdef CONFIG_NET_CLS_ACT | |
1117 | struct tcf_proto *otp = tp; | |
1118 | reclassify: | |
1119 | #endif | |
1120 | protocol = skb->protocol; | |
1121 | ||
1122 | for ( ; tp; tp = tp->next) { | |
1123 | if ((tp->protocol == protocol || | |
1124 | tp->protocol == __constant_htons(ETH_P_ALL)) && | |
1125 | (err = tp->classify(skb, tp, res)) >= 0) { | |
1126 | #ifdef CONFIG_NET_CLS_ACT | |
1127 | if ( TC_ACT_RECLASSIFY == err) { | |
1128 | __u32 verd = (__u32) G_TC_VERD(skb->tc_verd); | |
1129 | tp = otp; | |
1130 | ||
1131 | if (MAX_REC_LOOP < verd++) { | |
1132 | printk("rule prio %d protocol %02x reclassify is buggy packet dropped\n", | |
1133 | tp->prio&0xffff, ntohs(tp->protocol)); | |
1134 | return TC_ACT_SHOT; | |
1135 | } | |
1136 | skb->tc_verd = SET_TC_VERD(skb->tc_verd,verd); | |
1137 | goto reclassify; | |
1138 | } else { | |
1139 | if (skb->tc_verd) | |
1140 | skb->tc_verd = SET_TC_VERD(skb->tc_verd,0); | |
1141 | return err; | |
1142 | } | |
1143 | #else | |
1144 | ||
1145 | return err; | |
1146 | #endif | |
1147 | } | |
1148 | ||
1149 | } | |
1150 | return -1; | |
1151 | } | |
1152 | ||
1153 | static int psched_us_per_tick = 1; | |
1154 | static int psched_tick_per_us = 1; | |
1155 | ||
1156 | #ifdef CONFIG_PROC_FS | |
1157 | static int psched_show(struct seq_file *seq, void *v) | |
1158 | { | |
1159 | seq_printf(seq, "%08x %08x %08x %08x\n", | |
1160 | psched_tick_per_us, psched_us_per_tick, | |
1161 | 1000000, HZ); | |
1162 | ||
1163 | return 0; | |
1164 | } | |
1165 | ||
1166 | static int psched_open(struct inode *inode, struct file *file) | |
1167 | { | |
1168 | return single_open(file, psched_show, PDE(inode)->data); | |
1169 | } | |
1170 | ||
1171 | static struct file_operations psched_fops = { | |
1172 | .owner = THIS_MODULE, | |
1173 | .open = psched_open, | |
1174 | .read = seq_read, | |
1175 | .llseek = seq_lseek, | |
1176 | .release = single_release, | |
1177 | }; | |
1178 | #endif | |
1179 | ||
1180 | #ifdef CONFIG_NET_SCH_CLK_CPU | |
1181 | psched_tdiff_t psched_clock_per_hz; | |
1182 | int psched_clock_scale; | |
1183 | EXPORT_SYMBOL(psched_clock_per_hz); | |
1184 | EXPORT_SYMBOL(psched_clock_scale); | |
1185 | ||
1186 | psched_time_t psched_time_base; | |
1187 | cycles_t psched_time_mark; | |
1188 | EXPORT_SYMBOL(psched_time_mark); | |
1189 | EXPORT_SYMBOL(psched_time_base); | |
1190 | ||
1191 | /* | |
1192 | * Periodically adjust psched_time_base to avoid overflow | |
1193 | * with 32-bit get_cycles(). Safe up to 4GHz CPU. | |
1194 | */ | |
1195 | static void psched_tick(unsigned long); | |
8d06afab | 1196 | static DEFINE_TIMER(psched_timer, psched_tick, 0, 0); |
1da177e4 LT |
1197 | |
1198 | static void psched_tick(unsigned long dummy) | |
1199 | { | |
1200 | if (sizeof(cycles_t) == sizeof(u32)) { | |
1201 | psched_time_t dummy_stamp; | |
1202 | PSCHED_GET_TIME(dummy_stamp); | |
1203 | psched_timer.expires = jiffies + 1*HZ; | |
1204 | add_timer(&psched_timer); | |
1205 | } | |
1206 | } | |
1207 | ||
1208 | int __init psched_calibrate_clock(void) | |
1209 | { | |
1210 | psched_time_t stamp, stamp1; | |
1211 | struct timeval tv, tv1; | |
1212 | psched_tdiff_t delay; | |
1213 | long rdelay; | |
1214 | unsigned long stop; | |
1215 | ||
1216 | psched_tick(0); | |
1217 | stop = jiffies + HZ/10; | |
1218 | PSCHED_GET_TIME(stamp); | |
1219 | do_gettimeofday(&tv); | |
1220 | while (time_before(jiffies, stop)) { | |
1221 | barrier(); | |
1222 | cpu_relax(); | |
1223 | } | |
1224 | PSCHED_GET_TIME(stamp1); | |
1225 | do_gettimeofday(&tv1); | |
1226 | ||
1227 | delay = PSCHED_TDIFF(stamp1, stamp); | |
1228 | rdelay = tv1.tv_usec - tv.tv_usec; | |
1229 | rdelay += (tv1.tv_sec - tv.tv_sec)*1000000; | |
1230 | if (rdelay > delay) | |
1231 | return -1; | |
1232 | delay /= rdelay; | |
1233 | psched_tick_per_us = delay; | |
1234 | while ((delay>>=1) != 0) | |
1235 | psched_clock_scale++; | |
1236 | psched_us_per_tick = 1<<psched_clock_scale; | |
1237 | psched_clock_per_hz = (psched_tick_per_us*(1000000/HZ))>>psched_clock_scale; | |
1238 | return 0; | |
1239 | } | |
1240 | #endif | |
1241 | ||
1242 | static int __init pktsched_init(void) | |
1243 | { | |
1244 | struct rtnetlink_link *link_p; | |
1245 | ||
1246 | #ifdef CONFIG_NET_SCH_CLK_CPU | |
1247 | if (psched_calibrate_clock() < 0) | |
1248 | return -1; | |
1249 | #elif defined(CONFIG_NET_SCH_CLK_JIFFIES) | |
1250 | psched_tick_per_us = HZ<<PSCHED_JSCALE; | |
1251 | psched_us_per_tick = 1000000; | |
1252 | #endif | |
1253 | ||
1254 | link_p = rtnetlink_links[PF_UNSPEC]; | |
1255 | ||
1256 | /* Setup rtnetlink links. It is made here to avoid | |
1257 | exporting large number of public symbols. | |
1258 | */ | |
1259 | ||
1260 | if (link_p) { | |
1261 | link_p[RTM_NEWQDISC-RTM_BASE].doit = tc_modify_qdisc; | |
1262 | link_p[RTM_DELQDISC-RTM_BASE].doit = tc_get_qdisc; | |
1263 | link_p[RTM_GETQDISC-RTM_BASE].doit = tc_get_qdisc; | |
1264 | link_p[RTM_GETQDISC-RTM_BASE].dumpit = tc_dump_qdisc; | |
1265 | link_p[RTM_NEWTCLASS-RTM_BASE].doit = tc_ctl_tclass; | |
1266 | link_p[RTM_DELTCLASS-RTM_BASE].doit = tc_ctl_tclass; | |
1267 | link_p[RTM_GETTCLASS-RTM_BASE].doit = tc_ctl_tclass; | |
1268 | link_p[RTM_GETTCLASS-RTM_BASE].dumpit = tc_dump_tclass; | |
1269 | } | |
1270 | ||
1271 | register_qdisc(&pfifo_qdisc_ops); | |
1272 | register_qdisc(&bfifo_qdisc_ops); | |
1273 | proc_net_fops_create("psched", 0, &psched_fops); | |
1274 | ||
1275 | return 0; | |
1276 | } | |
1277 | ||
1278 | subsys_initcall(pktsched_init); | |
1279 | ||
d5d75cd6 | 1280 | EXPORT_SYMBOL(qdisc_lookup); |
1da177e4 LT |
1281 | EXPORT_SYMBOL(qdisc_get_rtab); |
1282 | EXPORT_SYMBOL(qdisc_put_rtab); | |
1283 | EXPORT_SYMBOL(register_qdisc); | |
1284 | EXPORT_SYMBOL(unregister_qdisc); | |
1285 | EXPORT_SYMBOL(tc_classify); |