Commit | Line | Data |
---|---|---|
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> |
5a0e3ad6 | 15 | #include <linux/slab.h> |
1da177e4 LT |
16 | #include <linux/types.h> |
17 | #include <linux/kernel.h> | |
1da177e4 | 18 | #include <linux/string.h> |
1da177e4 | 19 | #include <linux/errno.h> |
1da177e4 | 20 | #include <linux/skbuff.h> |
dc5fc579 | 21 | #include <net/netlink.h> |
1da177e4 | 22 | #include <net/pkt_sched.h> |
cf1facda | 23 | #include <net/pkt_cls.h> |
1da177e4 | 24 | |
cc7ec456 | 25 | struct prio_sched_data { |
1da177e4 | 26 | int bands; |
25d8c0d5 | 27 | struct tcf_proto __rcu *filter_list; |
6529eaba | 28 | struct tcf_block *block; |
1da177e4 LT |
29 | u8 prio2band[TC_PRIO_MAX+1]; |
30 | struct Qdisc *queues[TCQ_PRIO_BANDS]; | |
31 | }; | |
32 | ||
33 | ||
34 | static struct Qdisc * | |
35 | prio_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr) | |
36 | { | |
37 | struct prio_sched_data *q = qdisc_priv(sch); | |
38 | u32 band = skb->priority; | |
39 | struct tcf_result res; | |
25d8c0d5 | 40 | struct tcf_proto *fl; |
bdba91ec | 41 | int err; |
1da177e4 | 42 | |
c27f339a | 43 | *qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS; |
1da177e4 | 44 | if (TC_H_MAJ(skb->priority) != sch->handle) { |
25d8c0d5 | 45 | fl = rcu_dereference_bh(q->filter_list); |
87d83093 | 46 | err = tcf_classify(skb, fl, &res, false); |
1da177e4 | 47 | #ifdef CONFIG_NET_CLS_ACT |
dbaaa07a | 48 | switch (err) { |
1da177e4 LT |
49 | case TC_ACT_STOLEN: |
50 | case TC_ACT_QUEUED: | |
e25ea21f | 51 | case TC_ACT_TRAP: |
378a2f09 | 52 | *qerr = NET_XMIT_SUCCESS | __NET_XMIT_STOLEN; |
f3ae608e | 53 | /* fall through */ |
1da177e4 LT |
54 | case TC_ACT_SHOT: |
55 | return NULL; | |
3ff50b79 | 56 | } |
1da177e4 | 57 | #endif |
25d8c0d5 | 58 | if (!fl || err < 0) { |
1da177e4 LT |
59 | if (TC_H_MAJ(band)) |
60 | band = 0; | |
cc7ec456 | 61 | return q->queues[q->prio2band[band & TC_PRIO_MAX]]; |
1da177e4 LT |
62 | } |
63 | band = res.classid; | |
64 | } | |
65 | band = TC_H_MIN(band) - 1; | |
3e5c2d3b | 66 | if (band >= q->bands) |
1d8ae3fd DM |
67 | return q->queues[q->prio2band[0]]; |
68 | ||
1da177e4 LT |
69 | return q->queues[band]; |
70 | } | |
71 | ||
72 | static int | |
520ac30f | 73 | prio_enqueue(struct sk_buff *skb, struct Qdisc *sch, struct sk_buff **to_free) |
1da177e4 LT |
74 | { |
75 | struct Qdisc *qdisc; | |
76 | int ret; | |
77 | ||
78 | qdisc = prio_classify(skb, sch, &ret); | |
79 | #ifdef CONFIG_NET_CLS_ACT | |
80 | if (qdisc == NULL) { | |
29f1df6c | 81 | |
c27f339a | 82 | if (ret & __NET_XMIT_BYPASS) |
25331d6c | 83 | qdisc_qstats_drop(sch); |
39ad1297 | 84 | __qdisc_drop(skb, to_free); |
1da177e4 LT |
85 | return ret; |
86 | } | |
87 | #endif | |
88 | ||
520ac30f | 89 | ret = qdisc_enqueue(skb, qdisc, to_free); |
5f86173b | 90 | if (ret == NET_XMIT_SUCCESS) { |
6529d75a | 91 | qdisc_qstats_backlog_inc(sch, skb); |
1da177e4 LT |
92 | sch->q.qlen++; |
93 | return NET_XMIT_SUCCESS; | |
94 | } | |
378a2f09 | 95 | if (net_xmit_drop_count(ret)) |
25331d6c | 96 | qdisc_qstats_drop(sch); |
10297b99 | 97 | return ret; |
1da177e4 LT |
98 | } |
99 | ||
48a8f519 PM |
100 | static struct sk_buff *prio_peek(struct Qdisc *sch) |
101 | { | |
102 | struct prio_sched_data *q = qdisc_priv(sch); | |
103 | int prio; | |
104 | ||
105 | for (prio = 0; prio < q->bands; prio++) { | |
106 | struct Qdisc *qdisc = q->queues[prio]; | |
107 | struct sk_buff *skb = qdisc->ops->peek(qdisc); | |
108 | if (skb) | |
109 | return skb; | |
110 | } | |
111 | return NULL; | |
112 | } | |
1da177e4 | 113 | |
cc7ec456 | 114 | static struct sk_buff *prio_dequeue(struct Qdisc *sch) |
1da177e4 | 115 | { |
1da177e4 LT |
116 | struct prio_sched_data *q = qdisc_priv(sch); |
117 | int prio; | |
1da177e4 LT |
118 | |
119 | for (prio = 0; prio < q->bands; prio++) { | |
1d8ae3fd | 120 | struct Qdisc *qdisc = q->queues[prio]; |
3557619f | 121 | struct sk_buff *skb = qdisc_dequeue_peeked(qdisc); |
1d8ae3fd | 122 | if (skb) { |
9190b3b3 | 123 | qdisc_bstats_update(sch, skb); |
6529d75a | 124 | qdisc_qstats_backlog_dec(sch, skb); |
1d8ae3fd DM |
125 | sch->q.qlen--; |
126 | return skb; | |
1da177e4 LT |
127 | } |
128 | } | |
129 | return NULL; | |
130 | ||
131 | } | |
132 | ||
1da177e4 | 133 | static void |
cc7ec456 | 134 | prio_reset(struct Qdisc *sch) |
1da177e4 LT |
135 | { |
136 | int prio; | |
137 | struct prio_sched_data *q = qdisc_priv(sch); | |
138 | ||
cc7ec456 | 139 | for (prio = 0; prio < q->bands; prio++) |
1da177e4 | 140 | qdisc_reset(q->queues[prio]); |
6529d75a | 141 | sch->qstats.backlog = 0; |
1da177e4 LT |
142 | sch->q.qlen = 0; |
143 | } | |
144 | ||
145 | static void | |
cc7ec456 | 146 | prio_destroy(struct Qdisc *sch) |
1da177e4 LT |
147 | { |
148 | int prio; | |
149 | struct prio_sched_data *q = qdisc_priv(sch); | |
1da177e4 | 150 | |
6529eaba | 151 | tcf_block_put(q->block); |
cc7ec456 | 152 | for (prio = 0; prio < q->bands; prio++) |
1da177e4 LT |
153 | qdisc_destroy(q->queues[prio]); |
154 | } | |
155 | ||
2030721c AA |
156 | static int prio_tune(struct Qdisc *sch, struct nlattr *opt, |
157 | struct netlink_ext_ack *extack) | |
1da177e4 LT |
158 | { |
159 | struct prio_sched_data *q = qdisc_priv(sch); | |
3d7c8257 ED |
160 | struct Qdisc *queues[TCQ_PRIO_BANDS]; |
161 | int oldbands = q->bands, i; | |
d62733c8 | 162 | struct tc_prio_qopt *qopt; |
1da177e4 | 163 | |
1d8ae3fd DM |
164 | if (nla_len(opt) < sizeof(*qopt)) |
165 | return -EINVAL; | |
166 | qopt = nla_data(opt); | |
d62733c8 | 167 | |
1d8ae3fd | 168 | if (qopt->bands > TCQ_PRIO_BANDS || qopt->bands < 2) |
1da177e4 LT |
169 | return -EINVAL; |
170 | ||
cc7ec456 | 171 | for (i = 0; i <= TC_PRIO_MAX; i++) { |
1d8ae3fd | 172 | if (qopt->priomap[i] >= qopt->bands) |
1da177e4 LT |
173 | return -EINVAL; |
174 | } | |
175 | ||
3d7c8257 ED |
176 | /* Before commit, make sure we can allocate all new qdiscs */ |
177 | for (i = oldbands; i < qopt->bands; i++) { | |
178 | queues[i] = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops, | |
179 | TC_H_MAKE(sch->handle, i + 1)); | |
180 | if (!queues[i]) { | |
181 | while (i > oldbands) | |
182 | qdisc_destroy(queues[--i]); | |
183 | return -ENOMEM; | |
184 | } | |
185 | } | |
186 | ||
1da177e4 | 187 | sch_tree_lock(sch); |
1d8ae3fd | 188 | q->bands = qopt->bands; |
1da177e4 LT |
189 | memcpy(q->prio2band, qopt->priomap, TC_PRIO_MAX+1); |
190 | ||
3d7c8257 | 191 | for (i = q->bands; i < oldbands; i++) { |
b94c8afc | 192 | struct Qdisc *child = q->queues[i]; |
1da177e4 | 193 | |
3d7c8257 ED |
194 | qdisc_tree_reduce_backlog(child, child->q.qlen, |
195 | child->qstats.backlog); | |
196 | qdisc_destroy(child); | |
1da177e4 | 197 | } |
cbdf4511 | 198 | |
49b49971 | 199 | for (i = oldbands; i < q->bands; i++) { |
3d7c8257 | 200 | q->queues[i] = queues[i]; |
49b49971 JK |
201 | if (q->queues[i] != &noop_qdisc) |
202 | qdisc_hash_add(q->queues[i], true); | |
203 | } | |
cbdf4511 | 204 | |
3d7c8257 | 205 | sch_tree_unlock(sch); |
1da177e4 LT |
206 | return 0; |
207 | } | |
208 | ||
e63d7dfd AA |
209 | static int prio_init(struct Qdisc *sch, struct nlattr *opt, |
210 | struct netlink_ext_ack *extack) | |
1da177e4 | 211 | { |
6529eaba JP |
212 | struct prio_sched_data *q = qdisc_priv(sch); |
213 | int err; | |
214 | ||
3d7c8257 | 215 | if (!opt) |
1da177e4 | 216 | return -EINVAL; |
1da177e4 | 217 | |
69d78ef2 | 218 | err = tcf_block_get(&q->block, &q->filter_list, sch); |
6529eaba JP |
219 | if (err) |
220 | return err; | |
221 | ||
2030721c | 222 | return prio_tune(sch, opt, extack); |
1da177e4 LT |
223 | } |
224 | ||
225 | static int prio_dump(struct Qdisc *sch, struct sk_buff *skb) | |
226 | { | |
227 | struct prio_sched_data *q = qdisc_priv(sch); | |
27a884dc | 228 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
229 | struct tc_prio_qopt opt; |
230 | ||
231 | opt.bands = q->bands; | |
cc7ec456 | 232 | memcpy(&opt.priomap, q->prio2band, TC_PRIO_MAX + 1); |
d62733c8 | 233 | |
1b34ec43 DM |
234 | if (nla_put(skb, TCA_OPTIONS, sizeof(opt), &opt)) |
235 | goto nla_put_failure; | |
d62733c8 | 236 | |
1da177e4 LT |
237 | return skb->len; |
238 | ||
1e90474c | 239 | nla_put_failure: |
dc5fc579 | 240 | nlmsg_trim(skb, b); |
1da177e4 LT |
241 | return -1; |
242 | } | |
243 | ||
244 | static int prio_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new, | |
245 | struct Qdisc **old) | |
246 | { | |
247 | struct prio_sched_data *q = qdisc_priv(sch); | |
248 | unsigned long band = arg - 1; | |
249 | ||
1da177e4 LT |
250 | if (new == NULL) |
251 | new = &noop_qdisc; | |
252 | ||
86a7996c | 253 | *old = qdisc_replace(sch, new, &q->queues[band]); |
1da177e4 LT |
254 | return 0; |
255 | } | |
256 | ||
257 | static struct Qdisc * | |
258 | prio_leaf(struct Qdisc *sch, unsigned long arg) | |
259 | { | |
260 | struct prio_sched_data *q = qdisc_priv(sch); | |
261 | unsigned long band = arg - 1; | |
262 | ||
1da177e4 LT |
263 | return q->queues[band]; |
264 | } | |
265 | ||
143976ce | 266 | static unsigned long prio_find(struct Qdisc *sch, u32 classid) |
1da177e4 LT |
267 | { |
268 | struct prio_sched_data *q = qdisc_priv(sch); | |
269 | unsigned long band = TC_H_MIN(classid); | |
270 | ||
271 | if (band - 1 >= q->bands) | |
272 | return 0; | |
273 | return band; | |
274 | } | |
275 | ||
276 | static unsigned long prio_bind(struct Qdisc *sch, unsigned long parent, u32 classid) | |
277 | { | |
143976ce | 278 | return prio_find(sch, classid); |
1da177e4 LT |
279 | } |
280 | ||
281 | ||
143976ce | 282 | static void prio_unbind(struct Qdisc *q, unsigned long cl) |
1da177e4 | 283 | { |
1da177e4 LT |
284 | } |
285 | ||
1da177e4 LT |
286 | static int prio_dump_class(struct Qdisc *sch, unsigned long cl, struct sk_buff *skb, |
287 | struct tcmsg *tcm) | |
288 | { | |
289 | struct prio_sched_data *q = qdisc_priv(sch); | |
290 | ||
1da177e4 | 291 | tcm->tcm_handle |= TC_H_MIN(cl); |
5b9a9ccf | 292 | tcm->tcm_info = q->queues[cl-1]->handle; |
1da177e4 LT |
293 | return 0; |
294 | } | |
295 | ||
2cf6c36c JP |
296 | static int prio_dump_class_stats(struct Qdisc *sch, unsigned long cl, |
297 | struct gnet_dump *d) | |
298 | { | |
299 | struct prio_sched_data *q = qdisc_priv(sch); | |
300 | struct Qdisc *cl_q; | |
301 | ||
302 | cl_q = q->queues[cl - 1]; | |
edb09eb1 ED |
303 | if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch), |
304 | d, NULL, &cl_q->bstats) < 0 || | |
b0ab6f92 | 305 | gnet_stats_copy_queue(d, NULL, &cl_q->qstats, cl_q->q.qlen) < 0) |
2cf6c36c JP |
306 | return -1; |
307 | ||
308 | return 0; | |
309 | } | |
310 | ||
1da177e4 LT |
311 | static void prio_walk(struct Qdisc *sch, struct qdisc_walker *arg) |
312 | { | |
313 | struct prio_sched_data *q = qdisc_priv(sch); | |
314 | int prio; | |
315 | ||
316 | if (arg->stop) | |
317 | return; | |
318 | ||
319 | for (prio = 0; prio < q->bands; prio++) { | |
320 | if (arg->count < arg->skip) { | |
321 | arg->count++; | |
322 | continue; | |
323 | } | |
cc7ec456 | 324 | if (arg->fn(sch, prio + 1, arg) < 0) { |
1da177e4 LT |
325 | arg->stop = 1; |
326 | break; | |
327 | } | |
328 | arg->count++; | |
329 | } | |
330 | } | |
331 | ||
6529eaba | 332 | static struct tcf_block *prio_tcf_block(struct Qdisc *sch, unsigned long cl) |
1da177e4 LT |
333 | { |
334 | struct prio_sched_data *q = qdisc_priv(sch); | |
335 | ||
336 | if (cl) | |
337 | return NULL; | |
6529eaba | 338 | return q->block; |
1da177e4 LT |
339 | } |
340 | ||
20fea08b | 341 | static const struct Qdisc_class_ops prio_class_ops = { |
1da177e4 LT |
342 | .graft = prio_graft, |
343 | .leaf = prio_leaf, | |
143976ce | 344 | .find = prio_find, |
1da177e4 | 345 | .walk = prio_walk, |
6529eaba | 346 | .tcf_block = prio_tcf_block, |
1da177e4 | 347 | .bind_tcf = prio_bind, |
143976ce | 348 | .unbind_tcf = prio_unbind, |
1da177e4 | 349 | .dump = prio_dump_class, |
2cf6c36c | 350 | .dump_stats = prio_dump_class_stats, |
1da177e4 LT |
351 | }; |
352 | ||
20fea08b | 353 | static struct Qdisc_ops prio_qdisc_ops __read_mostly = { |
1da177e4 LT |
354 | .next = NULL, |
355 | .cl_ops = &prio_class_ops, | |
356 | .id = "prio", | |
357 | .priv_size = sizeof(struct prio_sched_data), | |
358 | .enqueue = prio_enqueue, | |
359 | .dequeue = prio_dequeue, | |
48a8f519 | 360 | .peek = prio_peek, |
1da177e4 LT |
361 | .init = prio_init, |
362 | .reset = prio_reset, | |
363 | .destroy = prio_destroy, | |
364 | .change = prio_tune, | |
365 | .dump = prio_dump, | |
366 | .owner = THIS_MODULE, | |
367 | }; | |
368 | ||
369 | static int __init prio_module_init(void) | |
370 | { | |
1d8ae3fd | 371 | return register_qdisc(&prio_qdisc_ops); |
1da177e4 LT |
372 | } |
373 | ||
10297b99 | 374 | static void __exit prio_module_exit(void) |
1da177e4 LT |
375 | { |
376 | unregister_qdisc(&prio_qdisc_ops); | |
377 | } | |
378 | ||
379 | module_init(prio_module_init) | |
380 | module_exit(prio_module_exit) | |
381 | ||
382 | MODULE_LICENSE("GPL"); |