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1da177e4 LT |
1 | /* |
2 | * net/sched/sch_prio.c Simple 3-band priority "scheduler". | |
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> | |
10297b99 | 10 | * Fixes: 19990609: J Hadi Salim <hadi@nortelnetworks.com>: |
1da177e4 LT |
11 | * Init -- EINVAL when opt undefined |
12 | */ | |
13 | ||
1da177e4 LT |
14 | #include <linux/module.h> |
15 | #include <asm/uaccess.h> | |
16 | #include <asm/system.h> | |
17 | #include <linux/bitops.h> | |
18 | #include <linux/types.h> | |
19 | #include <linux/kernel.h> | |
1da177e4 LT |
20 | #include <linux/string.h> |
21 | #include <linux/mm.h> | |
22 | #include <linux/socket.h> | |
23 | #include <linux/sockios.h> | |
24 | #include <linux/in.h> | |
25 | #include <linux/errno.h> | |
26 | #include <linux/interrupt.h> | |
27 | #include <linux/if_ether.h> | |
28 | #include <linux/inet.h> | |
29 | #include <linux/netdevice.h> | |
30 | #include <linux/etherdevice.h> | |
31 | #include <linux/notifier.h> | |
32 | #include <net/ip.h> | |
33 | #include <net/route.h> | |
34 | #include <linux/skbuff.h> | |
dc5fc579 | 35 | #include <net/netlink.h> |
1da177e4 LT |
36 | #include <net/sock.h> |
37 | #include <net/pkt_sched.h> | |
38 | ||
39 | ||
40 | struct prio_sched_data | |
41 | { | |
42 | int bands; | |
43 | struct tcf_proto *filter_list; | |
44 | u8 prio2band[TC_PRIO_MAX+1]; | |
45 | struct Qdisc *queues[TCQ_PRIO_BANDS]; | |
46 | }; | |
47 | ||
48 | ||
49 | static struct Qdisc * | |
50 | prio_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr) | |
51 | { | |
52 | struct prio_sched_data *q = qdisc_priv(sch); | |
53 | u32 band = skb->priority; | |
54 | struct tcf_result res; | |
55 | ||
29f1df6c | 56 | *qerr = NET_XMIT_BYPASS; |
1da177e4 LT |
57 | if (TC_H_MAJ(skb->priority) != sch->handle) { |
58 | #ifdef CONFIG_NET_CLS_ACT | |
59 | switch (tc_classify(skb, q->filter_list, &res)) { | |
60 | case TC_ACT_STOLEN: | |
61 | case TC_ACT_QUEUED: | |
62 | *qerr = NET_XMIT_SUCCESS; | |
63 | case TC_ACT_SHOT: | |
64 | return NULL; | |
65 | }; | |
66 | ||
67 | if (!q->filter_list ) { | |
68 | #else | |
69 | if (!q->filter_list || tc_classify(skb, q->filter_list, &res)) { | |
70 | #endif | |
71 | if (TC_H_MAJ(band)) | |
72 | band = 0; | |
73 | return q->queues[q->prio2band[band&TC_PRIO_MAX]]; | |
74 | } | |
75 | band = res.classid; | |
76 | } | |
77 | band = TC_H_MIN(band) - 1; | |
78 | if (band > q->bands) | |
79 | return q->queues[q->prio2band[0]]; | |
80 | ||
81 | return q->queues[band]; | |
82 | } | |
83 | ||
84 | static int | |
85 | prio_enqueue(struct sk_buff *skb, struct Qdisc *sch) | |
86 | { | |
87 | struct Qdisc *qdisc; | |
88 | int ret; | |
89 | ||
90 | qdisc = prio_classify(skb, sch, &ret); | |
91 | #ifdef CONFIG_NET_CLS_ACT | |
92 | if (qdisc == NULL) { | |
29f1df6c JHS |
93 | |
94 | if (ret == NET_XMIT_BYPASS) | |
1da177e4 LT |
95 | sch->qstats.drops++; |
96 | kfree_skb(skb); | |
97 | return ret; | |
98 | } | |
99 | #endif | |
100 | ||
101 | if ((ret = qdisc->enqueue(skb, qdisc)) == NET_XMIT_SUCCESS) { | |
102 | sch->bstats.bytes += skb->len; | |
103 | sch->bstats.packets++; | |
104 | sch->q.qlen++; | |
105 | return NET_XMIT_SUCCESS; | |
106 | } | |
107 | sch->qstats.drops++; | |
10297b99 | 108 | return ret; |
1da177e4 LT |
109 | } |
110 | ||
111 | ||
112 | static int | |
113 | prio_requeue(struct sk_buff *skb, struct Qdisc* sch) | |
114 | { | |
115 | struct Qdisc *qdisc; | |
116 | int ret; | |
117 | ||
118 | qdisc = prio_classify(skb, sch, &ret); | |
119 | #ifdef CONFIG_NET_CLS_ACT | |
120 | if (qdisc == NULL) { | |
29f1df6c | 121 | if (ret == NET_XMIT_BYPASS) |
1da177e4 LT |
122 | sch->qstats.drops++; |
123 | kfree_skb(skb); | |
124 | return ret; | |
125 | } | |
126 | #endif | |
127 | ||
128 | if ((ret = qdisc->ops->requeue(skb, qdisc)) == NET_XMIT_SUCCESS) { | |
129 | sch->q.qlen++; | |
130 | sch->qstats.requeues++; | |
131 | return 0; | |
132 | } | |
133 | sch->qstats.drops++; | |
134 | return NET_XMIT_DROP; | |
135 | } | |
136 | ||
137 | ||
138 | static struct sk_buff * | |
139 | prio_dequeue(struct Qdisc* sch) | |
140 | { | |
141 | struct sk_buff *skb; | |
142 | struct prio_sched_data *q = qdisc_priv(sch); | |
143 | int prio; | |
144 | struct Qdisc *qdisc; | |
145 | ||
146 | for (prio = 0; prio < q->bands; prio++) { | |
147 | qdisc = q->queues[prio]; | |
148 | skb = qdisc->dequeue(qdisc); | |
149 | if (skb) { | |
150 | sch->q.qlen--; | |
151 | return skb; | |
152 | } | |
153 | } | |
154 | return NULL; | |
155 | ||
156 | } | |
157 | ||
158 | static unsigned int prio_drop(struct Qdisc* sch) | |
159 | { | |
160 | struct prio_sched_data *q = qdisc_priv(sch); | |
161 | int prio; | |
162 | unsigned int len; | |
163 | struct Qdisc *qdisc; | |
164 | ||
165 | for (prio = q->bands-1; prio >= 0; prio--) { | |
166 | qdisc = q->queues[prio]; | |
6d037a26 | 167 | if (qdisc->ops->drop && (len = qdisc->ops->drop(qdisc)) != 0) { |
1da177e4 LT |
168 | sch->q.qlen--; |
169 | return len; | |
170 | } | |
171 | } | |
172 | return 0; | |
173 | } | |
174 | ||
175 | ||
176 | static void | |
177 | prio_reset(struct Qdisc* sch) | |
178 | { | |
179 | int prio; | |
180 | struct prio_sched_data *q = qdisc_priv(sch); | |
181 | ||
182 | for (prio=0; prio<q->bands; prio++) | |
183 | qdisc_reset(q->queues[prio]); | |
184 | sch->q.qlen = 0; | |
185 | } | |
186 | ||
187 | static void | |
188 | prio_destroy(struct Qdisc* sch) | |
189 | { | |
190 | int prio; | |
191 | struct prio_sched_data *q = qdisc_priv(sch); | |
1da177e4 | 192 | |
a48b5a61 | 193 | tcf_destroy_chain(q->filter_list); |
1da177e4 LT |
194 | for (prio=0; prio<q->bands; prio++) |
195 | qdisc_destroy(q->queues[prio]); | |
196 | } | |
197 | ||
198 | static int prio_tune(struct Qdisc *sch, struct rtattr *opt) | |
199 | { | |
200 | struct prio_sched_data *q = qdisc_priv(sch); | |
201 | struct tc_prio_qopt *qopt = RTA_DATA(opt); | |
202 | int i; | |
203 | ||
204 | if (opt->rta_len < RTA_LENGTH(sizeof(*qopt))) | |
205 | return -EINVAL; | |
206 | if (qopt->bands > TCQ_PRIO_BANDS || qopt->bands < 2) | |
207 | return -EINVAL; | |
208 | ||
209 | for (i=0; i<=TC_PRIO_MAX; i++) { | |
210 | if (qopt->priomap[i] >= qopt->bands) | |
211 | return -EINVAL; | |
212 | } | |
213 | ||
214 | sch_tree_lock(sch); | |
215 | q->bands = qopt->bands; | |
216 | memcpy(q->prio2band, qopt->priomap, TC_PRIO_MAX+1); | |
217 | ||
218 | for (i=q->bands; i<TCQ_PRIO_BANDS; i++) { | |
219 | struct Qdisc *child = xchg(&q->queues[i], &noop_qdisc); | |
5e50da01 PM |
220 | if (child != &noop_qdisc) { |
221 | qdisc_tree_decrease_qlen(child, child->q.qlen); | |
1da177e4 | 222 | qdisc_destroy(child); |
5e50da01 | 223 | } |
1da177e4 LT |
224 | } |
225 | sch_tree_unlock(sch); | |
226 | ||
dd914b40 AA |
227 | for (i=0; i<q->bands; i++) { |
228 | if (q->queues[i] == &noop_qdisc) { | |
1da177e4 | 229 | struct Qdisc *child; |
9f9afec4 PM |
230 | child = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops, |
231 | TC_H_MAKE(sch->handle, i + 1)); | |
1da177e4 LT |
232 | if (child) { |
233 | sch_tree_lock(sch); | |
dd914b40 | 234 | child = xchg(&q->queues[i], child); |
1da177e4 | 235 | |
5e50da01 PM |
236 | if (child != &noop_qdisc) { |
237 | qdisc_tree_decrease_qlen(child, | |
238 | child->q.qlen); | |
1da177e4 | 239 | qdisc_destroy(child); |
5e50da01 | 240 | } |
1da177e4 LT |
241 | sch_tree_unlock(sch); |
242 | } | |
243 | } | |
244 | } | |
245 | return 0; | |
246 | } | |
247 | ||
248 | static int prio_init(struct Qdisc *sch, struct rtattr *opt) | |
249 | { | |
250 | struct prio_sched_data *q = qdisc_priv(sch); | |
251 | int i; | |
252 | ||
253 | for (i=0; i<TCQ_PRIO_BANDS; i++) | |
254 | q->queues[i] = &noop_qdisc; | |
255 | ||
256 | if (opt == NULL) { | |
257 | return -EINVAL; | |
258 | } else { | |
259 | int err; | |
260 | ||
261 | if ((err= prio_tune(sch, opt)) != 0) | |
262 | return err; | |
263 | } | |
264 | return 0; | |
265 | } | |
266 | ||
267 | static int prio_dump(struct Qdisc *sch, struct sk_buff *skb) | |
268 | { | |
269 | struct prio_sched_data *q = qdisc_priv(sch); | |
27a884dc | 270 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
271 | struct tc_prio_qopt opt; |
272 | ||
273 | opt.bands = q->bands; | |
274 | memcpy(&opt.priomap, q->prio2band, TC_PRIO_MAX+1); | |
275 | RTA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt); | |
276 | return skb->len; | |
277 | ||
278 | rtattr_failure: | |
dc5fc579 | 279 | nlmsg_trim(skb, b); |
1da177e4 LT |
280 | return -1; |
281 | } | |
282 | ||
283 | static int prio_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new, | |
284 | struct Qdisc **old) | |
285 | { | |
286 | struct prio_sched_data *q = qdisc_priv(sch); | |
287 | unsigned long band = arg - 1; | |
288 | ||
289 | if (band >= q->bands) | |
290 | return -EINVAL; | |
291 | ||
292 | if (new == NULL) | |
293 | new = &noop_qdisc; | |
294 | ||
295 | sch_tree_lock(sch); | |
296 | *old = q->queues[band]; | |
297 | q->queues[band] = new; | |
5e50da01 | 298 | qdisc_tree_decrease_qlen(*old, (*old)->q.qlen); |
1da177e4 LT |
299 | qdisc_reset(*old); |
300 | sch_tree_unlock(sch); | |
301 | ||
302 | return 0; | |
303 | } | |
304 | ||
305 | static struct Qdisc * | |
306 | prio_leaf(struct Qdisc *sch, unsigned long arg) | |
307 | { | |
308 | struct prio_sched_data *q = qdisc_priv(sch); | |
309 | unsigned long band = arg - 1; | |
310 | ||
311 | if (band >= q->bands) | |
312 | return NULL; | |
313 | ||
314 | return q->queues[band]; | |
315 | } | |
316 | ||
317 | static unsigned long prio_get(struct Qdisc *sch, u32 classid) | |
318 | { | |
319 | struct prio_sched_data *q = qdisc_priv(sch); | |
320 | unsigned long band = TC_H_MIN(classid); | |
321 | ||
322 | if (band - 1 >= q->bands) | |
323 | return 0; | |
324 | return band; | |
325 | } | |
326 | ||
327 | static unsigned long prio_bind(struct Qdisc *sch, unsigned long parent, u32 classid) | |
328 | { | |
329 | return prio_get(sch, classid); | |
330 | } | |
331 | ||
332 | ||
333 | static void prio_put(struct Qdisc *q, unsigned long cl) | |
334 | { | |
335 | return; | |
336 | } | |
337 | ||
338 | static int prio_change(struct Qdisc *sch, u32 handle, u32 parent, struct rtattr **tca, unsigned long *arg) | |
339 | { | |
340 | unsigned long cl = *arg; | |
341 | struct prio_sched_data *q = qdisc_priv(sch); | |
342 | ||
343 | if (cl - 1 > q->bands) | |
344 | return -ENOENT; | |
345 | return 0; | |
346 | } | |
347 | ||
348 | static int prio_delete(struct Qdisc *sch, unsigned long cl) | |
349 | { | |
350 | struct prio_sched_data *q = qdisc_priv(sch); | |
351 | if (cl - 1 > q->bands) | |
352 | return -ENOENT; | |
353 | return 0; | |
354 | } | |
355 | ||
356 | ||
357 | static int prio_dump_class(struct Qdisc *sch, unsigned long cl, struct sk_buff *skb, | |
358 | struct tcmsg *tcm) | |
359 | { | |
360 | struct prio_sched_data *q = qdisc_priv(sch); | |
361 | ||
362 | if (cl - 1 > q->bands) | |
363 | return -ENOENT; | |
364 | tcm->tcm_handle |= TC_H_MIN(cl); | |
365 | if (q->queues[cl-1]) | |
366 | tcm->tcm_info = q->queues[cl-1]->handle; | |
367 | return 0; | |
368 | } | |
369 | ||
2cf6c36c JP |
370 | static int prio_dump_class_stats(struct Qdisc *sch, unsigned long cl, |
371 | struct gnet_dump *d) | |
372 | { | |
373 | struct prio_sched_data *q = qdisc_priv(sch); | |
374 | struct Qdisc *cl_q; | |
375 | ||
376 | cl_q = q->queues[cl - 1]; | |
377 | if (gnet_stats_copy_basic(d, &cl_q->bstats) < 0 || | |
378 | gnet_stats_copy_queue(d, &cl_q->qstats) < 0) | |
379 | return -1; | |
380 | ||
381 | return 0; | |
382 | } | |
383 | ||
1da177e4 LT |
384 | static void prio_walk(struct Qdisc *sch, struct qdisc_walker *arg) |
385 | { | |
386 | struct prio_sched_data *q = qdisc_priv(sch); | |
387 | int prio; | |
388 | ||
389 | if (arg->stop) | |
390 | return; | |
391 | ||
392 | for (prio = 0; prio < q->bands; prio++) { | |
393 | if (arg->count < arg->skip) { | |
394 | arg->count++; | |
395 | continue; | |
396 | } | |
397 | if (arg->fn(sch, prio+1, arg) < 0) { | |
398 | arg->stop = 1; | |
399 | break; | |
400 | } | |
401 | arg->count++; | |
402 | } | |
403 | } | |
404 | ||
405 | static struct tcf_proto ** prio_find_tcf(struct Qdisc *sch, unsigned long cl) | |
406 | { | |
407 | struct prio_sched_data *q = qdisc_priv(sch); | |
408 | ||
409 | if (cl) | |
410 | return NULL; | |
411 | return &q->filter_list; | |
412 | } | |
413 | ||
414 | static struct Qdisc_class_ops prio_class_ops = { | |
415 | .graft = prio_graft, | |
416 | .leaf = prio_leaf, | |
417 | .get = prio_get, | |
418 | .put = prio_put, | |
419 | .change = prio_change, | |
420 | .delete = prio_delete, | |
421 | .walk = prio_walk, | |
422 | .tcf_chain = prio_find_tcf, | |
423 | .bind_tcf = prio_bind, | |
424 | .unbind_tcf = prio_put, | |
425 | .dump = prio_dump_class, | |
2cf6c36c | 426 | .dump_stats = prio_dump_class_stats, |
1da177e4 LT |
427 | }; |
428 | ||
429 | static struct Qdisc_ops prio_qdisc_ops = { | |
430 | .next = NULL, | |
431 | .cl_ops = &prio_class_ops, | |
432 | .id = "prio", | |
433 | .priv_size = sizeof(struct prio_sched_data), | |
434 | .enqueue = prio_enqueue, | |
435 | .dequeue = prio_dequeue, | |
436 | .requeue = prio_requeue, | |
437 | .drop = prio_drop, | |
438 | .init = prio_init, | |
439 | .reset = prio_reset, | |
440 | .destroy = prio_destroy, | |
441 | .change = prio_tune, | |
442 | .dump = prio_dump, | |
443 | .owner = THIS_MODULE, | |
444 | }; | |
445 | ||
446 | static int __init prio_module_init(void) | |
447 | { | |
448 | return register_qdisc(&prio_qdisc_ops); | |
449 | } | |
450 | ||
10297b99 | 451 | static void __exit prio_module_exit(void) |
1da177e4 LT |
452 | { |
453 | unregister_qdisc(&prio_qdisc_ops); | |
454 | } | |
455 | ||
456 | module_init(prio_module_init) | |
457 | module_exit(prio_module_exit) | |
458 | ||
459 | MODULE_LICENSE("GPL"); |