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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> | |
10 | * Fixes: 19990609: J Hadi Salim <hadi@nortelnetworks.com>: | |
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> | |
20 | #include <linux/sched.h> | |
21 | #include <linux/string.h> | |
22 | #include <linux/mm.h> | |
23 | #include <linux/socket.h> | |
24 | #include <linux/sockios.h> | |
25 | #include <linux/in.h> | |
26 | #include <linux/errno.h> | |
27 | #include <linux/interrupt.h> | |
28 | #include <linux/if_ether.h> | |
29 | #include <linux/inet.h> | |
30 | #include <linux/netdevice.h> | |
31 | #include <linux/etherdevice.h> | |
32 | #include <linux/notifier.h> | |
33 | #include <net/ip.h> | |
34 | #include <net/route.h> | |
35 | #include <linux/skbuff.h> | |
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++; | |
108 | return ret; | |
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); | |
192 | struct tcf_proto *tp; | |
193 | ||
194 | while ((tp = q->filter_list) != NULL) { | |
195 | q->filter_list = tp->next; | |
196 | tcf_destroy(tp); | |
197 | } | |
198 | ||
199 | for (prio=0; prio<q->bands; prio++) | |
200 | qdisc_destroy(q->queues[prio]); | |
201 | } | |
202 | ||
203 | static int prio_tune(struct Qdisc *sch, struct rtattr *opt) | |
204 | { | |
205 | struct prio_sched_data *q = qdisc_priv(sch); | |
206 | struct tc_prio_qopt *qopt = RTA_DATA(opt); | |
207 | int i; | |
208 | ||
209 | if (opt->rta_len < RTA_LENGTH(sizeof(*qopt))) | |
210 | return -EINVAL; | |
211 | if (qopt->bands > TCQ_PRIO_BANDS || qopt->bands < 2) | |
212 | return -EINVAL; | |
213 | ||
214 | for (i=0; i<=TC_PRIO_MAX; i++) { | |
215 | if (qopt->priomap[i] >= qopt->bands) | |
216 | return -EINVAL; | |
217 | } | |
218 | ||
219 | sch_tree_lock(sch); | |
220 | q->bands = qopt->bands; | |
221 | memcpy(q->prio2band, qopt->priomap, TC_PRIO_MAX+1); | |
222 | ||
223 | for (i=q->bands; i<TCQ_PRIO_BANDS; i++) { | |
224 | struct Qdisc *child = xchg(&q->queues[i], &noop_qdisc); | |
225 | if (child != &noop_qdisc) | |
226 | qdisc_destroy(child); | |
227 | } | |
228 | sch_tree_unlock(sch); | |
229 | ||
dd914b40 AA |
230 | for (i=0; i<q->bands; i++) { |
231 | if (q->queues[i] == &noop_qdisc) { | |
1da177e4 LT |
232 | struct Qdisc *child; |
233 | child = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops); | |
234 | if (child) { | |
235 | sch_tree_lock(sch); | |
dd914b40 | 236 | child = xchg(&q->queues[i], child); |
1da177e4 LT |
237 | |
238 | if (child != &noop_qdisc) | |
239 | qdisc_destroy(child); | |
240 | sch_tree_unlock(sch); | |
241 | } | |
242 | } | |
243 | } | |
244 | return 0; | |
245 | } | |
246 | ||
247 | static int prio_init(struct Qdisc *sch, struct rtattr *opt) | |
248 | { | |
249 | struct prio_sched_data *q = qdisc_priv(sch); | |
250 | int i; | |
251 | ||
252 | for (i=0; i<TCQ_PRIO_BANDS; i++) | |
253 | q->queues[i] = &noop_qdisc; | |
254 | ||
255 | if (opt == NULL) { | |
256 | return -EINVAL; | |
257 | } else { | |
258 | int err; | |
259 | ||
260 | if ((err= prio_tune(sch, opt)) != 0) | |
261 | return err; | |
262 | } | |
263 | return 0; | |
264 | } | |
265 | ||
266 | static int prio_dump(struct Qdisc *sch, struct sk_buff *skb) | |
267 | { | |
268 | struct prio_sched_data *q = qdisc_priv(sch); | |
269 | unsigned char *b = skb->tail; | |
270 | struct tc_prio_qopt opt; | |
271 | ||
272 | opt.bands = q->bands; | |
273 | memcpy(&opt.priomap, q->prio2band, TC_PRIO_MAX+1); | |
274 | RTA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt); | |
275 | return skb->len; | |
276 | ||
277 | rtattr_failure: | |
278 | skb_trim(skb, b - skb->data); | |
279 | return -1; | |
280 | } | |
281 | ||
282 | static int prio_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new, | |
283 | struct Qdisc **old) | |
284 | { | |
285 | struct prio_sched_data *q = qdisc_priv(sch); | |
286 | unsigned long band = arg - 1; | |
287 | ||
288 | if (band >= q->bands) | |
289 | return -EINVAL; | |
290 | ||
291 | if (new == NULL) | |
292 | new = &noop_qdisc; | |
293 | ||
294 | sch_tree_lock(sch); | |
295 | *old = q->queues[band]; | |
296 | q->queues[band] = new; | |
297 | sch->q.qlen -= (*old)->q.qlen; | |
298 | qdisc_reset(*old); | |
299 | sch_tree_unlock(sch); | |
300 | ||
301 | return 0; | |
302 | } | |
303 | ||
304 | static struct Qdisc * | |
305 | prio_leaf(struct Qdisc *sch, unsigned long arg) | |
306 | { | |
307 | struct prio_sched_data *q = qdisc_priv(sch); | |
308 | unsigned long band = arg - 1; | |
309 | ||
310 | if (band >= q->bands) | |
311 | return NULL; | |
312 | ||
313 | return q->queues[band]; | |
314 | } | |
315 | ||
316 | static unsigned long prio_get(struct Qdisc *sch, u32 classid) | |
317 | { | |
318 | struct prio_sched_data *q = qdisc_priv(sch); | |
319 | unsigned long band = TC_H_MIN(classid); | |
320 | ||
321 | if (band - 1 >= q->bands) | |
322 | return 0; | |
323 | return band; | |
324 | } | |
325 | ||
326 | static unsigned long prio_bind(struct Qdisc *sch, unsigned long parent, u32 classid) | |
327 | { | |
328 | return prio_get(sch, classid); | |
329 | } | |
330 | ||
331 | ||
332 | static void prio_put(struct Qdisc *q, unsigned long cl) | |
333 | { | |
334 | return; | |
335 | } | |
336 | ||
337 | static int prio_change(struct Qdisc *sch, u32 handle, u32 parent, struct rtattr **tca, unsigned long *arg) | |
338 | { | |
339 | unsigned long cl = *arg; | |
340 | struct prio_sched_data *q = qdisc_priv(sch); | |
341 | ||
342 | if (cl - 1 > q->bands) | |
343 | return -ENOENT; | |
344 | return 0; | |
345 | } | |
346 | ||
347 | static int prio_delete(struct Qdisc *sch, unsigned long cl) | |
348 | { | |
349 | struct prio_sched_data *q = qdisc_priv(sch); | |
350 | if (cl - 1 > q->bands) | |
351 | return -ENOENT; | |
352 | return 0; | |
353 | } | |
354 | ||
355 | ||
356 | static int prio_dump_class(struct Qdisc *sch, unsigned long cl, struct sk_buff *skb, | |
357 | struct tcmsg *tcm) | |
358 | { | |
359 | struct prio_sched_data *q = qdisc_priv(sch); | |
360 | ||
361 | if (cl - 1 > q->bands) | |
362 | return -ENOENT; | |
363 | tcm->tcm_handle |= TC_H_MIN(cl); | |
364 | if (q->queues[cl-1]) | |
365 | tcm->tcm_info = q->queues[cl-1]->handle; | |
366 | return 0; | |
367 | } | |
368 | ||
369 | static void prio_walk(struct Qdisc *sch, struct qdisc_walker *arg) | |
370 | { | |
371 | struct prio_sched_data *q = qdisc_priv(sch); | |
372 | int prio; | |
373 | ||
374 | if (arg->stop) | |
375 | return; | |
376 | ||
377 | for (prio = 0; prio < q->bands; prio++) { | |
378 | if (arg->count < arg->skip) { | |
379 | arg->count++; | |
380 | continue; | |
381 | } | |
382 | if (arg->fn(sch, prio+1, arg) < 0) { | |
383 | arg->stop = 1; | |
384 | break; | |
385 | } | |
386 | arg->count++; | |
387 | } | |
388 | } | |
389 | ||
390 | static struct tcf_proto ** prio_find_tcf(struct Qdisc *sch, unsigned long cl) | |
391 | { | |
392 | struct prio_sched_data *q = qdisc_priv(sch); | |
393 | ||
394 | if (cl) | |
395 | return NULL; | |
396 | return &q->filter_list; | |
397 | } | |
398 | ||
399 | static struct Qdisc_class_ops prio_class_ops = { | |
400 | .graft = prio_graft, | |
401 | .leaf = prio_leaf, | |
402 | .get = prio_get, | |
403 | .put = prio_put, | |
404 | .change = prio_change, | |
405 | .delete = prio_delete, | |
406 | .walk = prio_walk, | |
407 | .tcf_chain = prio_find_tcf, | |
408 | .bind_tcf = prio_bind, | |
409 | .unbind_tcf = prio_put, | |
410 | .dump = prio_dump_class, | |
411 | }; | |
412 | ||
413 | static struct Qdisc_ops prio_qdisc_ops = { | |
414 | .next = NULL, | |
415 | .cl_ops = &prio_class_ops, | |
416 | .id = "prio", | |
417 | .priv_size = sizeof(struct prio_sched_data), | |
418 | .enqueue = prio_enqueue, | |
419 | .dequeue = prio_dequeue, | |
420 | .requeue = prio_requeue, | |
421 | .drop = prio_drop, | |
422 | .init = prio_init, | |
423 | .reset = prio_reset, | |
424 | .destroy = prio_destroy, | |
425 | .change = prio_tune, | |
426 | .dump = prio_dump, | |
427 | .owner = THIS_MODULE, | |
428 | }; | |
429 | ||
430 | static int __init prio_module_init(void) | |
431 | { | |
432 | return register_qdisc(&prio_qdisc_ops); | |
433 | } | |
434 | ||
435 | static void __exit prio_module_exit(void) | |
436 | { | |
437 | unregister_qdisc(&prio_qdisc_ops); | |
438 | } | |
439 | ||
440 | module_init(prio_module_init) | |
441 | module_exit(prio_module_exit) | |
442 | ||
443 | MODULE_LICENSE("GPL"); |