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92651940 AD |
1 | /* |
2 | * Copyright (c) 2008, Intel Corporation. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms and conditions of the GNU General Public License, | |
6 | * version 2, as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
c057b190 | 14 | * this program; if not, see <http://www.gnu.org/licenses/>. |
92651940 AD |
15 | * |
16 | * Author: Alexander Duyck <alexander.h.duyck@intel.com> | |
17 | */ | |
18 | ||
19 | #include <linux/module.h> | |
5a0e3ad6 | 20 | #include <linux/slab.h> |
92651940 AD |
21 | #include <linux/types.h> |
22 | #include <linux/kernel.h> | |
23 | #include <linux/string.h> | |
24 | #include <linux/errno.h> | |
25 | #include <linux/skbuff.h> | |
26 | #include <net/netlink.h> | |
27 | #include <net/pkt_sched.h> | |
cf1facda | 28 | #include <net/pkt_cls.h> |
92651940 AD |
29 | |
30 | struct multiq_sched_data { | |
31 | u16 bands; | |
32 | u16 max_bands; | |
33 | u16 curband; | |
25d8c0d5 | 34 | struct tcf_proto __rcu *filter_list; |
6529eaba | 35 | struct tcf_block *block; |
92651940 AD |
36 | struct Qdisc **queues; |
37 | }; | |
38 | ||
39 | ||
40 | static struct Qdisc * | |
41 | multiq_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr) | |
42 | { | |
43 | struct multiq_sched_data *q = qdisc_priv(sch); | |
44 | u32 band; | |
45 | struct tcf_result res; | |
25d8c0d5 | 46 | struct tcf_proto *fl = rcu_dereference_bh(q->filter_list); |
92651940 AD |
47 | int err; |
48 | ||
49 | *qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS; | |
87d83093 | 50 | err = tcf_classify(skb, fl, &res, false); |
92651940 AD |
51 | #ifdef CONFIG_NET_CLS_ACT |
52 | switch (err) { | |
53 | case TC_ACT_STOLEN: | |
54 | case TC_ACT_QUEUED: | |
e25ea21f | 55 | case TC_ACT_TRAP: |
92651940 AD |
56 | *qerr = NET_XMIT_SUCCESS | __NET_XMIT_STOLEN; |
57 | case TC_ACT_SHOT: | |
58 | return NULL; | |
59 | } | |
60 | #endif | |
61 | band = skb_get_queue_mapping(skb); | |
62 | ||
63 | if (band >= q->bands) | |
64 | return q->queues[0]; | |
65 | ||
66 | return q->queues[band]; | |
67 | } | |
68 | ||
69 | static int | |
520ac30f ED |
70 | multiq_enqueue(struct sk_buff *skb, struct Qdisc *sch, |
71 | struct sk_buff **to_free) | |
92651940 AD |
72 | { |
73 | struct Qdisc *qdisc; | |
74 | int ret; | |
75 | ||
76 | qdisc = multiq_classify(skb, sch, &ret); | |
77 | #ifdef CONFIG_NET_CLS_ACT | |
78 | if (qdisc == NULL) { | |
79 | ||
80 | if (ret & __NET_XMIT_BYPASS) | |
25331d6c | 81 | qdisc_qstats_drop(sch); |
520ac30f | 82 | __qdisc_drop(skb, to_free); |
92651940 AD |
83 | return ret; |
84 | } | |
85 | #endif | |
86 | ||
520ac30f | 87 | ret = qdisc_enqueue(skb, qdisc, to_free); |
92651940 | 88 | if (ret == NET_XMIT_SUCCESS) { |
92651940 AD |
89 | sch->q.qlen++; |
90 | return NET_XMIT_SUCCESS; | |
91 | } | |
92 | if (net_xmit_drop_count(ret)) | |
25331d6c | 93 | qdisc_qstats_drop(sch); |
92651940 AD |
94 | return ret; |
95 | } | |
96 | ||
92651940 AD |
97 | static struct sk_buff *multiq_dequeue(struct Qdisc *sch) |
98 | { | |
99 | struct multiq_sched_data *q = qdisc_priv(sch); | |
100 | struct Qdisc *qdisc; | |
101 | struct sk_buff *skb; | |
102 | int band; | |
103 | ||
104 | for (band = 0; band < q->bands; band++) { | |
105 | /* cycle through bands to ensure fairness */ | |
106 | q->curband++; | |
107 | if (q->curband >= q->bands) | |
108 | q->curband = 0; | |
109 | ||
110 | /* Check that target subqueue is available before | |
f30ab418 | 111 | * pulling an skb to avoid head-of-line blocking. |
92651940 | 112 | */ |
73466498 TH |
113 | if (!netif_xmit_stopped( |
114 | netdev_get_tx_queue(qdisc_dev(sch), q->curband))) { | |
92651940 AD |
115 | qdisc = q->queues[q->curband]; |
116 | skb = qdisc->dequeue(qdisc); | |
117 | if (skb) { | |
9190b3b3 | 118 | qdisc_bstats_update(sch, skb); |
92651940 AD |
119 | sch->q.qlen--; |
120 | return skb; | |
121 | } | |
122 | } | |
123 | } | |
124 | return NULL; | |
125 | ||
126 | } | |
127 | ||
8e3af978 JP |
128 | static struct sk_buff *multiq_peek(struct Qdisc *sch) |
129 | { | |
130 | struct multiq_sched_data *q = qdisc_priv(sch); | |
131 | unsigned int curband = q->curband; | |
132 | struct Qdisc *qdisc; | |
133 | struct sk_buff *skb; | |
134 | int band; | |
135 | ||
136 | for (band = 0; band < q->bands; band++) { | |
137 | /* cycle through bands to ensure fairness */ | |
138 | curband++; | |
139 | if (curband >= q->bands) | |
140 | curband = 0; | |
141 | ||
142 | /* Check that target subqueue is available before | |
f30ab418 | 143 | * pulling an skb to avoid head-of-line blocking. |
8e3af978 | 144 | */ |
73466498 TH |
145 | if (!netif_xmit_stopped( |
146 | netdev_get_tx_queue(qdisc_dev(sch), curband))) { | |
8e3af978 JP |
147 | qdisc = q->queues[curband]; |
148 | skb = qdisc->ops->peek(qdisc); | |
149 | if (skb) | |
150 | return skb; | |
151 | } | |
152 | } | |
153 | return NULL; | |
154 | ||
155 | } | |
156 | ||
92651940 AD |
157 | static void |
158 | multiq_reset(struct Qdisc *sch) | |
159 | { | |
160 | u16 band; | |
161 | struct multiq_sched_data *q = qdisc_priv(sch); | |
162 | ||
163 | for (band = 0; band < q->bands; band++) | |
164 | qdisc_reset(q->queues[band]); | |
165 | sch->q.qlen = 0; | |
166 | q->curband = 0; | |
167 | } | |
168 | ||
169 | static void | |
170 | multiq_destroy(struct Qdisc *sch) | |
171 | { | |
172 | int band; | |
173 | struct multiq_sched_data *q = qdisc_priv(sch); | |
174 | ||
6529eaba | 175 | tcf_block_put(q->block); |
92651940 AD |
176 | for (band = 0; band < q->bands; band++) |
177 | qdisc_destroy(q->queues[band]); | |
178 | ||
179 | kfree(q->queues); | |
180 | } | |
181 | ||
182 | static int multiq_tune(struct Qdisc *sch, struct nlattr *opt) | |
183 | { | |
184 | struct multiq_sched_data *q = qdisc_priv(sch); | |
185 | struct tc_multiq_qopt *qopt; | |
186 | int i; | |
187 | ||
188 | if (!netif_is_multiqueue(qdisc_dev(sch))) | |
149490f1 | 189 | return -EOPNOTSUPP; |
92651940 AD |
190 | if (nla_len(opt) < sizeof(*qopt)) |
191 | return -EINVAL; | |
192 | ||
193 | qopt = nla_data(opt); | |
194 | ||
195 | qopt->bands = qdisc_dev(sch)->real_num_tx_queues; | |
196 | ||
197 | sch_tree_lock(sch); | |
198 | q->bands = qopt->bands; | |
199 | for (i = q->bands; i < q->max_bands; i++) { | |
f07d1501 | 200 | if (q->queues[i] != &noop_qdisc) { |
b94c8afc PM |
201 | struct Qdisc *child = q->queues[i]; |
202 | q->queues[i] = &noop_qdisc; | |
2ccccf5f WC |
203 | qdisc_tree_reduce_backlog(child, child->q.qlen, |
204 | child->qstats.backlog); | |
92651940 AD |
205 | qdisc_destroy(child); |
206 | } | |
207 | } | |
208 | ||
209 | sch_tree_unlock(sch); | |
210 | ||
211 | for (i = 0; i < q->bands; i++) { | |
212 | if (q->queues[i] == &noop_qdisc) { | |
b94c8afc | 213 | struct Qdisc *child, *old; |
3511c913 | 214 | child = qdisc_create_dflt(sch->dev_queue, |
92651940 AD |
215 | &pfifo_qdisc_ops, |
216 | TC_H_MAKE(sch->handle, | |
217 | i + 1)); | |
218 | if (child) { | |
219 | sch_tree_lock(sch); | |
b94c8afc PM |
220 | old = q->queues[i]; |
221 | q->queues[i] = child; | |
49b49971 JK |
222 | if (child != &noop_qdisc) |
223 | qdisc_hash_add(child, true); | |
92651940 | 224 | |
b94c8afc | 225 | if (old != &noop_qdisc) { |
2ccccf5f WC |
226 | qdisc_tree_reduce_backlog(old, |
227 | old->q.qlen, | |
228 | old->qstats.backlog); | |
b94c8afc | 229 | qdisc_destroy(old); |
92651940 AD |
230 | } |
231 | sch_tree_unlock(sch); | |
232 | } | |
233 | } | |
234 | } | |
235 | return 0; | |
236 | } | |
237 | ||
238 | static int multiq_init(struct Qdisc *sch, struct nlattr *opt) | |
239 | { | |
240 | struct multiq_sched_data *q = qdisc_priv(sch); | |
f07d1501 | 241 | int i, err; |
92651940 AD |
242 | |
243 | q->queues = NULL; | |
244 | ||
245 | if (opt == NULL) | |
246 | return -EINVAL; | |
247 | ||
69d78ef2 | 248 | err = tcf_block_get(&q->block, &q->filter_list, sch); |
6529eaba JP |
249 | if (err) |
250 | return err; | |
251 | ||
92651940 AD |
252 | q->max_bands = qdisc_dev(sch)->num_tx_queues; |
253 | ||
254 | q->queues = kcalloc(q->max_bands, sizeof(struct Qdisc *), GFP_KERNEL); | |
255 | if (!q->queues) | |
256 | return -ENOBUFS; | |
257 | for (i = 0; i < q->max_bands; i++) | |
258 | q->queues[i] = &noop_qdisc; | |
259 | ||
e89d469e | 260 | return multiq_tune(sch, opt); |
92651940 AD |
261 | } |
262 | ||
263 | static int multiq_dump(struct Qdisc *sch, struct sk_buff *skb) | |
264 | { | |
265 | struct multiq_sched_data *q = qdisc_priv(sch); | |
266 | unsigned char *b = skb_tail_pointer(skb); | |
267 | struct tc_multiq_qopt opt; | |
268 | ||
269 | opt.bands = q->bands; | |
270 | opt.max_bands = q->max_bands; | |
271 | ||
1b34ec43 DM |
272 | if (nla_put(skb, TCA_OPTIONS, sizeof(opt), &opt)) |
273 | goto nla_put_failure; | |
92651940 AD |
274 | |
275 | return skb->len; | |
276 | ||
277 | nla_put_failure: | |
278 | nlmsg_trim(skb, b); | |
279 | return -1; | |
280 | } | |
281 | ||
282 | static int multiq_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new, | |
283 | struct Qdisc **old) | |
284 | { | |
285 | struct multiq_sched_data *q = qdisc_priv(sch); | |
286 | unsigned long band = arg - 1; | |
287 | ||
92651940 AD |
288 | if (new == NULL) |
289 | new = &noop_qdisc; | |
290 | ||
86a7996c | 291 | *old = qdisc_replace(sch, new, &q->queues[band]); |
92651940 AD |
292 | return 0; |
293 | } | |
294 | ||
295 | static struct Qdisc * | |
296 | multiq_leaf(struct Qdisc *sch, unsigned long arg) | |
297 | { | |
298 | struct multiq_sched_data *q = qdisc_priv(sch); | |
299 | unsigned long band = arg - 1; | |
300 | ||
92651940 AD |
301 | return q->queues[band]; |
302 | } | |
303 | ||
143976ce | 304 | static unsigned long multiq_find(struct Qdisc *sch, u32 classid) |
92651940 AD |
305 | { |
306 | struct multiq_sched_data *q = qdisc_priv(sch); | |
307 | unsigned long band = TC_H_MIN(classid); | |
308 | ||
309 | if (band - 1 >= q->bands) | |
310 | return 0; | |
311 | return band; | |
312 | } | |
313 | ||
314 | static unsigned long multiq_bind(struct Qdisc *sch, unsigned long parent, | |
315 | u32 classid) | |
316 | { | |
143976ce | 317 | return multiq_find(sch, classid); |
92651940 AD |
318 | } |
319 | ||
320 | ||
143976ce | 321 | static void multiq_unbind(struct Qdisc *q, unsigned long cl) |
92651940 | 322 | { |
92651940 AD |
323 | } |
324 | ||
92651940 AD |
325 | static int multiq_dump_class(struct Qdisc *sch, unsigned long cl, |
326 | struct sk_buff *skb, struct tcmsg *tcm) | |
327 | { | |
328 | struct multiq_sched_data *q = qdisc_priv(sch); | |
329 | ||
92651940 | 330 | tcm->tcm_handle |= TC_H_MIN(cl); |
cc7ec456 | 331 | tcm->tcm_info = q->queues[cl - 1]->handle; |
92651940 AD |
332 | return 0; |
333 | } | |
334 | ||
335 | static int multiq_dump_class_stats(struct Qdisc *sch, unsigned long cl, | |
336 | struct gnet_dump *d) | |
337 | { | |
338 | struct multiq_sched_data *q = qdisc_priv(sch); | |
339 | struct Qdisc *cl_q; | |
340 | ||
341 | cl_q = q->queues[cl - 1]; | |
edb09eb1 ED |
342 | if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch), |
343 | d, NULL, &cl_q->bstats) < 0 || | |
b0ab6f92 | 344 | gnet_stats_copy_queue(d, NULL, &cl_q->qstats, cl_q->q.qlen) < 0) |
92651940 AD |
345 | return -1; |
346 | ||
347 | return 0; | |
348 | } | |
349 | ||
350 | static void multiq_walk(struct Qdisc *sch, struct qdisc_walker *arg) | |
351 | { | |
352 | struct multiq_sched_data *q = qdisc_priv(sch); | |
353 | int band; | |
354 | ||
355 | if (arg->stop) | |
356 | return; | |
357 | ||
358 | for (band = 0; band < q->bands; band++) { | |
359 | if (arg->count < arg->skip) { | |
360 | arg->count++; | |
361 | continue; | |
362 | } | |
cc7ec456 | 363 | if (arg->fn(sch, band + 1, arg) < 0) { |
92651940 AD |
364 | arg->stop = 1; |
365 | break; | |
366 | } | |
367 | arg->count++; | |
368 | } | |
369 | } | |
370 | ||
6529eaba | 371 | static struct tcf_block *multiq_tcf_block(struct Qdisc *sch, unsigned long cl) |
92651940 AD |
372 | { |
373 | struct multiq_sched_data *q = qdisc_priv(sch); | |
374 | ||
375 | if (cl) | |
376 | return NULL; | |
6529eaba | 377 | return q->block; |
92651940 AD |
378 | } |
379 | ||
380 | static const struct Qdisc_class_ops multiq_class_ops = { | |
381 | .graft = multiq_graft, | |
382 | .leaf = multiq_leaf, | |
143976ce | 383 | .find = multiq_find, |
92651940 | 384 | .walk = multiq_walk, |
6529eaba | 385 | .tcf_block = multiq_tcf_block, |
92651940 | 386 | .bind_tcf = multiq_bind, |
143976ce | 387 | .unbind_tcf = multiq_unbind, |
92651940 AD |
388 | .dump = multiq_dump_class, |
389 | .dump_stats = multiq_dump_class_stats, | |
390 | }; | |
391 | ||
392 | static struct Qdisc_ops multiq_qdisc_ops __read_mostly = { | |
393 | .next = NULL, | |
394 | .cl_ops = &multiq_class_ops, | |
395 | .id = "multiq", | |
396 | .priv_size = sizeof(struct multiq_sched_data), | |
397 | .enqueue = multiq_enqueue, | |
398 | .dequeue = multiq_dequeue, | |
8e3af978 | 399 | .peek = multiq_peek, |
92651940 AD |
400 | .init = multiq_init, |
401 | .reset = multiq_reset, | |
402 | .destroy = multiq_destroy, | |
403 | .change = multiq_tune, | |
404 | .dump = multiq_dump, | |
405 | .owner = THIS_MODULE, | |
406 | }; | |
407 | ||
408 | static int __init multiq_module_init(void) | |
409 | { | |
410 | return register_qdisc(&multiq_qdisc_ops); | |
411 | } | |
412 | ||
413 | static void __exit multiq_module_exit(void) | |
414 | { | |
415 | unregister_qdisc(&multiq_qdisc_ops); | |
416 | } | |
417 | ||
418 | module_init(multiq_module_init) | |
419 | module_exit(multiq_module_exit) | |
420 | ||
421 | MODULE_LICENSE("GPL"); |