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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> |
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 LT |
22 | #include <net/pkt_sched.h> |
23 | ||
24 | ||
cc7ec456 | 25 | struct prio_sched_data { |
1da177e4 | 26 | int bands; |
25d8c0d5 | 27 | struct tcf_proto __rcu *filter_list; |
1da177e4 LT |
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; | |
25d8c0d5 | 39 | struct tcf_proto *fl; |
bdba91ec | 40 | int err; |
1da177e4 | 41 | |
c27f339a | 42 | *qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS; |
1da177e4 | 43 | if (TC_H_MAJ(skb->priority) != sch->handle) { |
25d8c0d5 | 44 | fl = rcu_dereference_bh(q->filter_list); |
3b3ae880 | 45 | err = tc_classify(skb, fl, &res, false); |
1da177e4 | 46 | #ifdef CONFIG_NET_CLS_ACT |
dbaaa07a | 47 | switch (err) { |
1da177e4 LT |
48 | case TC_ACT_STOLEN: |
49 | case TC_ACT_QUEUED: | |
378a2f09 | 50 | *qerr = NET_XMIT_SUCCESS | __NET_XMIT_STOLEN; |
1da177e4 LT |
51 | case TC_ACT_SHOT: |
52 | return NULL; | |
3ff50b79 | 53 | } |
1da177e4 | 54 | #endif |
25d8c0d5 | 55 | if (!fl || err < 0) { |
1da177e4 LT |
56 | if (TC_H_MAJ(band)) |
57 | band = 0; | |
cc7ec456 | 58 | return q->queues[q->prio2band[band & TC_PRIO_MAX]]; |
1da177e4 LT |
59 | } |
60 | band = res.classid; | |
61 | } | |
62 | band = TC_H_MIN(band) - 1; | |
3e5c2d3b | 63 | if (band >= q->bands) |
1d8ae3fd DM |
64 | return q->queues[q->prio2band[0]]; |
65 | ||
1da177e4 LT |
66 | return q->queues[band]; |
67 | } | |
68 | ||
69 | static int | |
520ac30f | 70 | prio_enqueue(struct sk_buff *skb, struct Qdisc *sch, struct sk_buff **to_free) |
1da177e4 LT |
71 | { |
72 | struct Qdisc *qdisc; | |
73 | int ret; | |
74 | ||
75 | qdisc = prio_classify(skb, sch, &ret); | |
76 | #ifdef CONFIG_NET_CLS_ACT | |
77 | if (qdisc == NULL) { | |
29f1df6c | 78 | |
c27f339a | 79 | if (ret & __NET_XMIT_BYPASS) |
25331d6c | 80 | qdisc_qstats_drop(sch); |
1da177e4 LT |
81 | kfree_skb(skb); |
82 | return ret; | |
83 | } | |
84 | #endif | |
85 | ||
520ac30f | 86 | ret = qdisc_enqueue(skb, qdisc, to_free); |
5f86173b | 87 | if (ret == NET_XMIT_SUCCESS) { |
6529d75a | 88 | qdisc_qstats_backlog_inc(sch, skb); |
1da177e4 LT |
89 | sch->q.qlen++; |
90 | return NET_XMIT_SUCCESS; | |
91 | } | |
378a2f09 | 92 | if (net_xmit_drop_count(ret)) |
25331d6c | 93 | qdisc_qstats_drop(sch); |
10297b99 | 94 | return ret; |
1da177e4 LT |
95 | } |
96 | ||
48a8f519 PM |
97 | static struct sk_buff *prio_peek(struct Qdisc *sch) |
98 | { | |
99 | struct prio_sched_data *q = qdisc_priv(sch); | |
100 | int prio; | |
101 | ||
102 | for (prio = 0; prio < q->bands; prio++) { | |
103 | struct Qdisc *qdisc = q->queues[prio]; | |
104 | struct sk_buff *skb = qdisc->ops->peek(qdisc); | |
105 | if (skb) | |
106 | return skb; | |
107 | } | |
108 | return NULL; | |
109 | } | |
1da177e4 | 110 | |
cc7ec456 | 111 | static struct sk_buff *prio_dequeue(struct Qdisc *sch) |
1da177e4 | 112 | { |
1da177e4 LT |
113 | struct prio_sched_data *q = qdisc_priv(sch); |
114 | int prio; | |
1da177e4 LT |
115 | |
116 | for (prio = 0; prio < q->bands; prio++) { | |
1d8ae3fd | 117 | struct Qdisc *qdisc = q->queues[prio]; |
3557619f | 118 | struct sk_buff *skb = qdisc_dequeue_peeked(qdisc); |
1d8ae3fd | 119 | if (skb) { |
9190b3b3 | 120 | qdisc_bstats_update(sch, skb); |
6529d75a | 121 | qdisc_qstats_backlog_dec(sch, skb); |
1d8ae3fd DM |
122 | sch->q.qlen--; |
123 | return skb; | |
1da177e4 LT |
124 | } |
125 | } | |
126 | return NULL; | |
127 | ||
128 | } | |
129 | ||
1da177e4 | 130 | static void |
cc7ec456 | 131 | prio_reset(struct Qdisc *sch) |
1da177e4 LT |
132 | { |
133 | int prio; | |
134 | struct prio_sched_data *q = qdisc_priv(sch); | |
135 | ||
cc7ec456 | 136 | for (prio = 0; prio < q->bands; prio++) |
1da177e4 | 137 | qdisc_reset(q->queues[prio]); |
6529d75a | 138 | sch->qstats.backlog = 0; |
1da177e4 LT |
139 | sch->q.qlen = 0; |
140 | } | |
141 | ||
142 | static void | |
cc7ec456 | 143 | prio_destroy(struct Qdisc *sch) |
1da177e4 LT |
144 | { |
145 | int prio; | |
146 | struct prio_sched_data *q = qdisc_priv(sch); | |
1da177e4 | 147 | |
ff31ab56 | 148 | tcf_destroy_chain(&q->filter_list); |
cc7ec456 | 149 | for (prio = 0; prio < q->bands; prio++) |
1da177e4 LT |
150 | qdisc_destroy(q->queues[prio]); |
151 | } | |
152 | ||
1e90474c | 153 | static int prio_tune(struct Qdisc *sch, struct nlattr *opt) |
1da177e4 LT |
154 | { |
155 | struct prio_sched_data *q = qdisc_priv(sch); | |
3d7c8257 ED |
156 | struct Qdisc *queues[TCQ_PRIO_BANDS]; |
157 | int oldbands = q->bands, i; | |
d62733c8 | 158 | struct tc_prio_qopt *qopt; |
1da177e4 | 159 | |
1d8ae3fd DM |
160 | if (nla_len(opt) < sizeof(*qopt)) |
161 | return -EINVAL; | |
162 | qopt = nla_data(opt); | |
d62733c8 | 163 | |
1d8ae3fd | 164 | if (qopt->bands > TCQ_PRIO_BANDS || qopt->bands < 2) |
1da177e4 LT |
165 | return -EINVAL; |
166 | ||
cc7ec456 | 167 | for (i = 0; i <= TC_PRIO_MAX; i++) { |
1d8ae3fd | 168 | if (qopt->priomap[i] >= qopt->bands) |
1da177e4 LT |
169 | return -EINVAL; |
170 | } | |
171 | ||
3d7c8257 ED |
172 | /* Before commit, make sure we can allocate all new qdiscs */ |
173 | for (i = oldbands; i < qopt->bands; i++) { | |
174 | queues[i] = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops, | |
175 | TC_H_MAKE(sch->handle, i + 1)); | |
176 | if (!queues[i]) { | |
177 | while (i > oldbands) | |
178 | qdisc_destroy(queues[--i]); | |
179 | return -ENOMEM; | |
180 | } | |
181 | } | |
182 | ||
1da177e4 | 183 | sch_tree_lock(sch); |
1d8ae3fd | 184 | q->bands = qopt->bands; |
1da177e4 LT |
185 | memcpy(q->prio2band, qopt->priomap, TC_PRIO_MAX+1); |
186 | ||
3d7c8257 | 187 | for (i = q->bands; i < oldbands; i++) { |
b94c8afc | 188 | struct Qdisc *child = q->queues[i]; |
1da177e4 | 189 | |
3d7c8257 ED |
190 | qdisc_tree_reduce_backlog(child, child->q.qlen, |
191 | child->qstats.backlog); | |
192 | qdisc_destroy(child); | |
1da177e4 | 193 | } |
cbdf4511 | 194 | |
3d7c8257 ED |
195 | for (i = oldbands; i < q->bands; i++) |
196 | q->queues[i] = queues[i]; | |
cbdf4511 | 197 | |
3d7c8257 | 198 | sch_tree_unlock(sch); |
1da177e4 LT |
199 | return 0; |
200 | } | |
201 | ||
1e90474c | 202 | static int prio_init(struct Qdisc *sch, struct nlattr *opt) |
1da177e4 | 203 | { |
3d7c8257 | 204 | if (!opt) |
1da177e4 | 205 | return -EINVAL; |
1da177e4 | 206 | |
3d7c8257 | 207 | return prio_tune(sch, opt); |
1da177e4 LT |
208 | } |
209 | ||
210 | static int prio_dump(struct Qdisc *sch, struct sk_buff *skb) | |
211 | { | |
212 | struct prio_sched_data *q = qdisc_priv(sch); | |
27a884dc | 213 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
214 | struct tc_prio_qopt opt; |
215 | ||
216 | opt.bands = q->bands; | |
cc7ec456 | 217 | memcpy(&opt.priomap, q->prio2band, TC_PRIO_MAX + 1); |
d62733c8 | 218 | |
1b34ec43 DM |
219 | if (nla_put(skb, TCA_OPTIONS, sizeof(opt), &opt)) |
220 | goto nla_put_failure; | |
d62733c8 | 221 | |
1da177e4 LT |
222 | return skb->len; |
223 | ||
1e90474c | 224 | nla_put_failure: |
dc5fc579 | 225 | nlmsg_trim(skb, b); |
1da177e4 LT |
226 | return -1; |
227 | } | |
228 | ||
229 | static int prio_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new, | |
230 | struct Qdisc **old) | |
231 | { | |
232 | struct prio_sched_data *q = qdisc_priv(sch); | |
233 | unsigned long band = arg - 1; | |
234 | ||
1da177e4 LT |
235 | if (new == NULL) |
236 | new = &noop_qdisc; | |
237 | ||
86a7996c | 238 | *old = qdisc_replace(sch, new, &q->queues[band]); |
1da177e4 LT |
239 | return 0; |
240 | } | |
241 | ||
242 | static struct Qdisc * | |
243 | prio_leaf(struct Qdisc *sch, unsigned long arg) | |
244 | { | |
245 | struct prio_sched_data *q = qdisc_priv(sch); | |
246 | unsigned long band = arg - 1; | |
247 | ||
1da177e4 LT |
248 | return q->queues[band]; |
249 | } | |
250 | ||
251 | static unsigned long prio_get(struct Qdisc *sch, u32 classid) | |
252 | { | |
253 | struct prio_sched_data *q = qdisc_priv(sch); | |
254 | unsigned long band = TC_H_MIN(classid); | |
255 | ||
256 | if (band - 1 >= q->bands) | |
257 | return 0; | |
258 | return band; | |
259 | } | |
260 | ||
261 | static unsigned long prio_bind(struct Qdisc *sch, unsigned long parent, u32 classid) | |
262 | { | |
263 | return prio_get(sch, classid); | |
264 | } | |
265 | ||
266 | ||
267 | static void prio_put(struct Qdisc *q, unsigned long cl) | |
268 | { | |
1da177e4 LT |
269 | } |
270 | ||
1da177e4 LT |
271 | static int prio_dump_class(struct Qdisc *sch, unsigned long cl, struct sk_buff *skb, |
272 | struct tcmsg *tcm) | |
273 | { | |
274 | struct prio_sched_data *q = qdisc_priv(sch); | |
275 | ||
1da177e4 | 276 | tcm->tcm_handle |= TC_H_MIN(cl); |
5b9a9ccf | 277 | tcm->tcm_info = q->queues[cl-1]->handle; |
1da177e4 LT |
278 | return 0; |
279 | } | |
280 | ||
2cf6c36c JP |
281 | static int prio_dump_class_stats(struct Qdisc *sch, unsigned long cl, |
282 | struct gnet_dump *d) | |
283 | { | |
284 | struct prio_sched_data *q = qdisc_priv(sch); | |
285 | struct Qdisc *cl_q; | |
286 | ||
287 | cl_q = q->queues[cl - 1]; | |
edb09eb1 ED |
288 | if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch), |
289 | d, NULL, &cl_q->bstats) < 0 || | |
b0ab6f92 | 290 | gnet_stats_copy_queue(d, NULL, &cl_q->qstats, cl_q->q.qlen) < 0) |
2cf6c36c JP |
291 | return -1; |
292 | ||
293 | return 0; | |
294 | } | |
295 | ||
1da177e4 LT |
296 | static void prio_walk(struct Qdisc *sch, struct qdisc_walker *arg) |
297 | { | |
298 | struct prio_sched_data *q = qdisc_priv(sch); | |
299 | int prio; | |
300 | ||
301 | if (arg->stop) | |
302 | return; | |
303 | ||
304 | for (prio = 0; prio < q->bands; prio++) { | |
305 | if (arg->count < arg->skip) { | |
306 | arg->count++; | |
307 | continue; | |
308 | } | |
cc7ec456 | 309 | if (arg->fn(sch, prio + 1, arg) < 0) { |
1da177e4 LT |
310 | arg->stop = 1; |
311 | break; | |
312 | } | |
313 | arg->count++; | |
314 | } | |
315 | } | |
316 | ||
25d8c0d5 JF |
317 | static struct tcf_proto __rcu **prio_find_tcf(struct Qdisc *sch, |
318 | unsigned long cl) | |
1da177e4 LT |
319 | { |
320 | struct prio_sched_data *q = qdisc_priv(sch); | |
321 | ||
322 | if (cl) | |
323 | return NULL; | |
324 | return &q->filter_list; | |
325 | } | |
326 | ||
20fea08b | 327 | static const struct Qdisc_class_ops prio_class_ops = { |
1da177e4 LT |
328 | .graft = prio_graft, |
329 | .leaf = prio_leaf, | |
330 | .get = prio_get, | |
331 | .put = prio_put, | |
1da177e4 LT |
332 | .walk = prio_walk, |
333 | .tcf_chain = prio_find_tcf, | |
334 | .bind_tcf = prio_bind, | |
335 | .unbind_tcf = prio_put, | |
336 | .dump = prio_dump_class, | |
2cf6c36c | 337 | .dump_stats = prio_dump_class_stats, |
1da177e4 LT |
338 | }; |
339 | ||
20fea08b | 340 | static struct Qdisc_ops prio_qdisc_ops __read_mostly = { |
1da177e4 LT |
341 | .next = NULL, |
342 | .cl_ops = &prio_class_ops, | |
343 | .id = "prio", | |
344 | .priv_size = sizeof(struct prio_sched_data), | |
345 | .enqueue = prio_enqueue, | |
346 | .dequeue = prio_dequeue, | |
48a8f519 | 347 | .peek = prio_peek, |
1da177e4 LT |
348 | .init = prio_init, |
349 | .reset = prio_reset, | |
350 | .destroy = prio_destroy, | |
351 | .change = prio_tune, | |
352 | .dump = prio_dump, | |
353 | .owner = THIS_MODULE, | |
354 | }; | |
355 | ||
356 | static int __init prio_module_init(void) | |
357 | { | |
1d8ae3fd | 358 | return register_qdisc(&prio_qdisc_ops); |
1da177e4 LT |
359 | } |
360 | ||
10297b99 | 361 | static void __exit prio_module_exit(void) |
1da177e4 LT |
362 | { |
363 | unregister_qdisc(&prio_qdisc_ops); | |
364 | } | |
365 | ||
366 | module_init(prio_module_init) | |
367 | module_exit(prio_module_exit) | |
368 | ||
369 | MODULE_LICENSE("GPL"); |