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Commit | Line | Data |
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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 | 14 | #include <linux/module.h> |
1da177e4 LT |
15 | #include <linux/types.h> |
16 | #include <linux/kernel.h> | |
1da177e4 | 17 | #include <linux/string.h> |
1da177e4 | 18 | #include <linux/errno.h> |
1da177e4 | 19 | #include <linux/skbuff.h> |
dc5fc579 | 20 | #include <net/netlink.h> |
1da177e4 LT |
21 | #include <net/pkt_sched.h> |
22 | ||
23 | ||
24 | struct prio_sched_data | |
25 | { | |
26 | int bands; | |
27 | struct tcf_proto *filter_list; | |
28 | u8 prio2band[TC_PRIO_MAX+1]; | |
29 | struct Qdisc *queues[TCQ_PRIO_BANDS]; | |
30 | }; | |
31 | ||
32 | ||
33 | static struct Qdisc * | |
34 | prio_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr) | |
35 | { | |
36 | struct prio_sched_data *q = qdisc_priv(sch); | |
37 | u32 band = skb->priority; | |
38 | struct tcf_result res; | |
bdba91ec | 39 | int err; |
1da177e4 | 40 | |
29f1df6c | 41 | *qerr = NET_XMIT_BYPASS; |
1da177e4 | 42 | if (TC_H_MAJ(skb->priority) != sch->handle) { |
bdba91ec | 43 | err = tc_classify(skb, q->filter_list, &res); |
1da177e4 | 44 | #ifdef CONFIG_NET_CLS_ACT |
dbaaa07a | 45 | switch (err) { |
1da177e4 LT |
46 | case TC_ACT_STOLEN: |
47 | case TC_ACT_QUEUED: | |
378a2f09 | 48 | *qerr = NET_XMIT_SUCCESS | __NET_XMIT_STOLEN; |
1da177e4 LT |
49 | case TC_ACT_SHOT: |
50 | return NULL; | |
3ff50b79 | 51 | } |
1da177e4 | 52 | #endif |
bdba91ec | 53 | if (!q->filter_list || err < 0) { |
1da177e4 LT |
54 | if (TC_H_MAJ(band)) |
55 | band = 0; | |
1d8ae3fd | 56 | return q->queues[q->prio2band[band&TC_PRIO_MAX]]; |
1da177e4 LT |
57 | } |
58 | band = res.classid; | |
59 | } | |
60 | band = TC_H_MIN(band) - 1; | |
3e5c2d3b | 61 | if (band >= q->bands) |
1d8ae3fd DM |
62 | return q->queues[q->prio2band[0]]; |
63 | ||
1da177e4 LT |
64 | return q->queues[band]; |
65 | } | |
66 | ||
67 | static int | |
68 | prio_enqueue(struct sk_buff *skb, struct Qdisc *sch) | |
69 | { | |
70 | struct Qdisc *qdisc; | |
71 | int ret; | |
72 | ||
73 | qdisc = prio_classify(skb, sch, &ret); | |
74 | #ifdef CONFIG_NET_CLS_ACT | |
75 | if (qdisc == NULL) { | |
29f1df6c JHS |
76 | |
77 | if (ret == NET_XMIT_BYPASS) | |
1da177e4 LT |
78 | sch->qstats.drops++; |
79 | kfree_skb(skb); | |
80 | return ret; | |
81 | } | |
82 | #endif | |
83 | ||
5f86173b JK |
84 | ret = qdisc_enqueue(skb, qdisc); |
85 | if (ret == NET_XMIT_SUCCESS) { | |
0abf77e5 | 86 | sch->bstats.bytes += qdisc_pkt_len(skb); |
1da177e4 LT |
87 | sch->bstats.packets++; |
88 | sch->q.qlen++; | |
89 | return NET_XMIT_SUCCESS; | |
90 | } | |
378a2f09 JP |
91 | if (net_xmit_drop_count(ret)) |
92 | sch->qstats.drops++; | |
10297b99 | 93 | return ret; |
1da177e4 LT |
94 | } |
95 | ||
96 | ||
97 | static int | |
98 | prio_requeue(struct sk_buff *skb, struct Qdisc* sch) | |
99 | { | |
100 | struct Qdisc *qdisc; | |
101 | int ret; | |
102 | ||
103 | qdisc = prio_classify(skb, sch, &ret); | |
104 | #ifdef CONFIG_NET_CLS_ACT | |
105 | if (qdisc == NULL) { | |
29f1df6c | 106 | if (ret == NET_XMIT_BYPASS) |
1da177e4 LT |
107 | sch->qstats.drops++; |
108 | kfree_skb(skb); | |
109 | return ret; | |
110 | } | |
111 | #endif | |
112 | ||
113 | if ((ret = qdisc->ops->requeue(skb, qdisc)) == NET_XMIT_SUCCESS) { | |
114 | sch->q.qlen++; | |
115 | sch->qstats.requeues++; | |
116 | return 0; | |
117 | } | |
378a2f09 JP |
118 | if (net_xmit_drop_count(ret)) |
119 | sch->qstats.drops++; | |
1da177e4 LT |
120 | return NET_XMIT_DROP; |
121 | } | |
122 | ||
123 | ||
1d8ae3fd | 124 | static struct sk_buff *prio_dequeue(struct Qdisc* sch) |
1da177e4 | 125 | { |
1da177e4 LT |
126 | struct prio_sched_data *q = qdisc_priv(sch); |
127 | int prio; | |
1da177e4 LT |
128 | |
129 | for (prio = 0; prio < q->bands; prio++) { | |
1d8ae3fd DM |
130 | struct Qdisc *qdisc = q->queues[prio]; |
131 | struct sk_buff *skb = qdisc->dequeue(qdisc); | |
132 | if (skb) { | |
133 | sch->q.qlen--; | |
134 | return skb; | |
1da177e4 LT |
135 | } |
136 | } | |
137 | return NULL; | |
138 | ||
139 | } | |
140 | ||
141 | static unsigned int prio_drop(struct Qdisc* sch) | |
142 | { | |
143 | struct prio_sched_data *q = qdisc_priv(sch); | |
144 | int prio; | |
145 | unsigned int len; | |
146 | struct Qdisc *qdisc; | |
147 | ||
148 | for (prio = q->bands-1; prio >= 0; prio--) { | |
149 | qdisc = q->queues[prio]; | |
6d037a26 | 150 | if (qdisc->ops->drop && (len = qdisc->ops->drop(qdisc)) != 0) { |
1da177e4 LT |
151 | sch->q.qlen--; |
152 | return len; | |
153 | } | |
154 | } | |
155 | return 0; | |
156 | } | |
157 | ||
158 | ||
159 | static void | |
160 | prio_reset(struct Qdisc* sch) | |
161 | { | |
162 | int prio; | |
163 | struct prio_sched_data *q = qdisc_priv(sch); | |
164 | ||
165 | for (prio=0; prio<q->bands; prio++) | |
166 | qdisc_reset(q->queues[prio]); | |
167 | sch->q.qlen = 0; | |
168 | } | |
169 | ||
170 | static void | |
171 | prio_destroy(struct Qdisc* sch) | |
172 | { | |
173 | int prio; | |
174 | struct prio_sched_data *q = qdisc_priv(sch); | |
1da177e4 | 175 | |
ff31ab56 | 176 | tcf_destroy_chain(&q->filter_list); |
1da177e4 LT |
177 | for (prio=0; prio<q->bands; prio++) |
178 | qdisc_destroy(q->queues[prio]); | |
179 | } | |
180 | ||
1e90474c | 181 | static int prio_tune(struct Qdisc *sch, struct nlattr *opt) |
1da177e4 LT |
182 | { |
183 | struct prio_sched_data *q = qdisc_priv(sch); | |
d62733c8 | 184 | struct tc_prio_qopt *qopt; |
1da177e4 LT |
185 | int i; |
186 | ||
1d8ae3fd DM |
187 | if (nla_len(opt) < sizeof(*qopt)) |
188 | return -EINVAL; | |
189 | qopt = nla_data(opt); | |
d62733c8 | 190 | |
1d8ae3fd | 191 | if (qopt->bands > TCQ_PRIO_BANDS || qopt->bands < 2) |
1da177e4 LT |
192 | return -EINVAL; |
193 | ||
194 | for (i=0; i<=TC_PRIO_MAX; i++) { | |
1d8ae3fd | 195 | if (qopt->priomap[i] >= qopt->bands) |
1da177e4 LT |
196 | return -EINVAL; |
197 | } | |
198 | ||
199 | sch_tree_lock(sch); | |
1d8ae3fd | 200 | q->bands = qopt->bands; |
1da177e4 LT |
201 | memcpy(q->prio2band, qopt->priomap, TC_PRIO_MAX+1); |
202 | ||
203 | for (i=q->bands; i<TCQ_PRIO_BANDS; i++) { | |
204 | struct Qdisc *child = xchg(&q->queues[i], &noop_qdisc); | |
5e50da01 PM |
205 | if (child != &noop_qdisc) { |
206 | qdisc_tree_decrease_qlen(child, child->q.qlen); | |
1da177e4 | 207 | qdisc_destroy(child); |
5e50da01 | 208 | } |
1da177e4 LT |
209 | } |
210 | sch_tree_unlock(sch); | |
211 | ||
dd914b40 AA |
212 | for (i=0; i<q->bands; i++) { |
213 | if (q->queues[i] == &noop_qdisc) { | |
1da177e4 | 214 | struct Qdisc *child; |
5ce2d488 | 215 | child = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue, |
bb949fbd | 216 | &pfifo_qdisc_ops, |
9f9afec4 | 217 | TC_H_MAKE(sch->handle, i + 1)); |
1da177e4 LT |
218 | if (child) { |
219 | sch_tree_lock(sch); | |
dd914b40 | 220 | child = xchg(&q->queues[i], child); |
1da177e4 | 221 | |
5e50da01 PM |
222 | if (child != &noop_qdisc) { |
223 | qdisc_tree_decrease_qlen(child, | |
224 | child->q.qlen); | |
1da177e4 | 225 | qdisc_destroy(child); |
5e50da01 | 226 | } |
1da177e4 LT |
227 | sch_tree_unlock(sch); |
228 | } | |
229 | } | |
230 | } | |
231 | return 0; | |
232 | } | |
233 | ||
1e90474c | 234 | static int prio_init(struct Qdisc *sch, struct nlattr *opt) |
1da177e4 LT |
235 | { |
236 | struct prio_sched_data *q = qdisc_priv(sch); | |
237 | int i; | |
238 | ||
239 | for (i=0; i<TCQ_PRIO_BANDS; i++) | |
240 | q->queues[i] = &noop_qdisc; | |
241 | ||
242 | if (opt == NULL) { | |
243 | return -EINVAL; | |
244 | } else { | |
245 | int err; | |
246 | ||
247 | if ((err= prio_tune(sch, opt)) != 0) | |
248 | return err; | |
249 | } | |
250 | return 0; | |
251 | } | |
252 | ||
253 | static int prio_dump(struct Qdisc *sch, struct sk_buff *skb) | |
254 | { | |
255 | struct prio_sched_data *q = qdisc_priv(sch); | |
27a884dc | 256 | unsigned char *b = skb_tail_pointer(skb); |
1e90474c | 257 | struct nlattr *nest; |
1da177e4 LT |
258 | struct tc_prio_qopt opt; |
259 | ||
260 | opt.bands = q->bands; | |
261 | memcpy(&opt.priomap, q->prio2band, TC_PRIO_MAX+1); | |
d62733c8 | 262 | |
1e90474c PM |
263 | nest = nla_nest_compat_start(skb, TCA_OPTIONS, sizeof(opt), &opt); |
264 | if (nest == NULL) | |
265 | goto nla_put_failure; | |
1e90474c | 266 | nla_nest_compat_end(skb, nest); |
d62733c8 | 267 | |
1da177e4 LT |
268 | return skb->len; |
269 | ||
1e90474c | 270 | nla_put_failure: |
dc5fc579 | 271 | nlmsg_trim(skb, b); |
1da177e4 LT |
272 | return -1; |
273 | } | |
274 | ||
275 | static int prio_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new, | |
276 | struct Qdisc **old) | |
277 | { | |
278 | struct prio_sched_data *q = qdisc_priv(sch); | |
279 | unsigned long band = arg - 1; | |
280 | ||
281 | if (band >= q->bands) | |
282 | return -EINVAL; | |
283 | ||
284 | if (new == NULL) | |
285 | new = &noop_qdisc; | |
286 | ||
287 | sch_tree_lock(sch); | |
288 | *old = q->queues[band]; | |
289 | q->queues[band] = new; | |
5e50da01 | 290 | qdisc_tree_decrease_qlen(*old, (*old)->q.qlen); |
1da177e4 LT |
291 | qdisc_reset(*old); |
292 | sch_tree_unlock(sch); | |
293 | ||
294 | return 0; | |
295 | } | |
296 | ||
297 | static struct Qdisc * | |
298 | prio_leaf(struct Qdisc *sch, unsigned long arg) | |
299 | { | |
300 | struct prio_sched_data *q = qdisc_priv(sch); | |
301 | unsigned long band = arg - 1; | |
302 | ||
303 | if (band >= q->bands) | |
304 | return NULL; | |
305 | ||
306 | return q->queues[band]; | |
307 | } | |
308 | ||
309 | static unsigned long prio_get(struct Qdisc *sch, u32 classid) | |
310 | { | |
311 | struct prio_sched_data *q = qdisc_priv(sch); | |
312 | unsigned long band = TC_H_MIN(classid); | |
313 | ||
314 | if (band - 1 >= q->bands) | |
315 | return 0; | |
316 | return band; | |
317 | } | |
318 | ||
319 | static unsigned long prio_bind(struct Qdisc *sch, unsigned long parent, u32 classid) | |
320 | { | |
321 | return prio_get(sch, classid); | |
322 | } | |
323 | ||
324 | ||
325 | static void prio_put(struct Qdisc *q, unsigned long cl) | |
326 | { | |
327 | return; | |
328 | } | |
329 | ||
1e90474c | 330 | static int prio_change(struct Qdisc *sch, u32 handle, u32 parent, struct nlattr **tca, unsigned long *arg) |
1da177e4 LT |
331 | { |
332 | unsigned long cl = *arg; | |
333 | struct prio_sched_data *q = qdisc_priv(sch); | |
334 | ||
335 | if (cl - 1 > q->bands) | |
336 | return -ENOENT; | |
337 | return 0; | |
338 | } | |
339 | ||
340 | static int prio_delete(struct Qdisc *sch, unsigned long cl) | |
341 | { | |
342 | struct prio_sched_data *q = qdisc_priv(sch); | |
343 | if (cl - 1 > q->bands) | |
344 | return -ENOENT; | |
345 | return 0; | |
346 | } | |
347 | ||
348 | ||
349 | static int prio_dump_class(struct Qdisc *sch, unsigned long cl, struct sk_buff *skb, | |
350 | struct tcmsg *tcm) | |
351 | { | |
352 | struct prio_sched_data *q = qdisc_priv(sch); | |
353 | ||
354 | if (cl - 1 > q->bands) | |
355 | return -ENOENT; | |
356 | tcm->tcm_handle |= TC_H_MIN(cl); | |
357 | if (q->queues[cl-1]) | |
358 | tcm->tcm_info = q->queues[cl-1]->handle; | |
359 | return 0; | |
360 | } | |
361 | ||
2cf6c36c JP |
362 | static int prio_dump_class_stats(struct Qdisc *sch, unsigned long cl, |
363 | struct gnet_dump *d) | |
364 | { | |
365 | struct prio_sched_data *q = qdisc_priv(sch); | |
366 | struct Qdisc *cl_q; | |
367 | ||
368 | cl_q = q->queues[cl - 1]; | |
369 | if (gnet_stats_copy_basic(d, &cl_q->bstats) < 0 || | |
370 | gnet_stats_copy_queue(d, &cl_q->qstats) < 0) | |
371 | return -1; | |
372 | ||
373 | return 0; | |
374 | } | |
375 | ||
1da177e4 LT |
376 | static void prio_walk(struct Qdisc *sch, struct qdisc_walker *arg) |
377 | { | |
378 | struct prio_sched_data *q = qdisc_priv(sch); | |
379 | int prio; | |
380 | ||
381 | if (arg->stop) | |
382 | return; | |
383 | ||
384 | for (prio = 0; prio < q->bands; prio++) { | |
385 | if (arg->count < arg->skip) { | |
386 | arg->count++; | |
387 | continue; | |
388 | } | |
389 | if (arg->fn(sch, prio+1, arg) < 0) { | |
390 | arg->stop = 1; | |
391 | break; | |
392 | } | |
393 | arg->count++; | |
394 | } | |
395 | } | |
396 | ||
397 | static struct tcf_proto ** prio_find_tcf(struct Qdisc *sch, unsigned long cl) | |
398 | { | |
399 | struct prio_sched_data *q = qdisc_priv(sch); | |
400 | ||
401 | if (cl) | |
402 | return NULL; | |
403 | return &q->filter_list; | |
404 | } | |
405 | ||
20fea08b | 406 | static const struct Qdisc_class_ops prio_class_ops = { |
1da177e4 LT |
407 | .graft = prio_graft, |
408 | .leaf = prio_leaf, | |
409 | .get = prio_get, | |
410 | .put = prio_put, | |
411 | .change = prio_change, | |
412 | .delete = prio_delete, | |
413 | .walk = prio_walk, | |
414 | .tcf_chain = prio_find_tcf, | |
415 | .bind_tcf = prio_bind, | |
416 | .unbind_tcf = prio_put, | |
417 | .dump = prio_dump_class, | |
2cf6c36c | 418 | .dump_stats = prio_dump_class_stats, |
1da177e4 LT |
419 | }; |
420 | ||
20fea08b | 421 | static struct Qdisc_ops prio_qdisc_ops __read_mostly = { |
1da177e4 LT |
422 | .next = NULL, |
423 | .cl_ops = &prio_class_ops, | |
424 | .id = "prio", | |
425 | .priv_size = sizeof(struct prio_sched_data), | |
426 | .enqueue = prio_enqueue, | |
427 | .dequeue = prio_dequeue, | |
428 | .requeue = prio_requeue, | |
429 | .drop = prio_drop, | |
430 | .init = prio_init, | |
431 | .reset = prio_reset, | |
432 | .destroy = prio_destroy, | |
433 | .change = prio_tune, | |
434 | .dump = prio_dump, | |
435 | .owner = THIS_MODULE, | |
436 | }; | |
437 | ||
438 | static int __init prio_module_init(void) | |
439 | { | |
1d8ae3fd | 440 | return register_qdisc(&prio_qdisc_ops); |
1da177e4 LT |
441 | } |
442 | ||
10297b99 | 443 | static void __exit prio_module_exit(void) |
1da177e4 LT |
444 | { |
445 | unregister_qdisc(&prio_qdisc_ops); | |
446 | } | |
447 | ||
448 | module_init(prio_module_init) | |
449 | module_exit(prio_module_exit) | |
450 | ||
451 | MODULE_LICENSE("GPL"); |