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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> | |
28 | ||
29 | ||
30 | struct multiq_sched_data { | |
31 | u16 bands; | |
32 | u16 max_bands; | |
33 | u16 curband; | |
34 | struct tcf_proto *filter_list; | |
35 | struct Qdisc **queues; | |
36 | }; | |
37 | ||
38 | ||
39 | static struct Qdisc * | |
40 | multiq_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr) | |
41 | { | |
42 | struct multiq_sched_data *q = qdisc_priv(sch); | |
43 | u32 band; | |
44 | struct tcf_result res; | |
45 | int err; | |
46 | ||
47 | *qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS; | |
48 | err = tc_classify(skb, q->filter_list, &res); | |
49 | #ifdef CONFIG_NET_CLS_ACT | |
50 | switch (err) { | |
51 | case TC_ACT_STOLEN: | |
52 | case TC_ACT_QUEUED: | |
53 | *qerr = NET_XMIT_SUCCESS | __NET_XMIT_STOLEN; | |
54 | case TC_ACT_SHOT: | |
55 | return NULL; | |
56 | } | |
57 | #endif | |
58 | band = skb_get_queue_mapping(skb); | |
59 | ||
60 | if (band >= q->bands) | |
61 | return q->queues[0]; | |
62 | ||
63 | return q->queues[band]; | |
64 | } | |
65 | ||
66 | static int | |
67 | multiq_enqueue(struct sk_buff *skb, struct Qdisc *sch) | |
68 | { | |
69 | struct Qdisc *qdisc; | |
70 | int ret; | |
71 | ||
72 | qdisc = multiq_classify(skb, sch, &ret); | |
73 | #ifdef CONFIG_NET_CLS_ACT | |
74 | if (qdisc == NULL) { | |
75 | ||
76 | if (ret & __NET_XMIT_BYPASS) | |
77 | sch->qstats.drops++; | |
78 | kfree_skb(skb); | |
79 | return ret; | |
80 | } | |
81 | #endif | |
82 | ||
83 | ret = qdisc_enqueue(skb, qdisc); | |
84 | if (ret == NET_XMIT_SUCCESS) { | |
92651940 AD |
85 | sch->q.qlen++; |
86 | return NET_XMIT_SUCCESS; | |
87 | } | |
88 | if (net_xmit_drop_count(ret)) | |
89 | sch->qstats.drops++; | |
90 | return ret; | |
91 | } | |
92 | ||
92651940 AD |
93 | static struct sk_buff *multiq_dequeue(struct Qdisc *sch) |
94 | { | |
95 | struct multiq_sched_data *q = qdisc_priv(sch); | |
96 | struct Qdisc *qdisc; | |
97 | struct sk_buff *skb; | |
98 | int band; | |
99 | ||
100 | for (band = 0; band < q->bands; band++) { | |
101 | /* cycle through bands to ensure fairness */ | |
102 | q->curband++; | |
103 | if (q->curband >= q->bands) | |
104 | q->curband = 0; | |
105 | ||
106 | /* Check that target subqueue is available before | |
f30ab418 | 107 | * pulling an skb to avoid head-of-line blocking. |
92651940 | 108 | */ |
73466498 TH |
109 | if (!netif_xmit_stopped( |
110 | netdev_get_tx_queue(qdisc_dev(sch), q->curband))) { | |
92651940 AD |
111 | qdisc = q->queues[q->curband]; |
112 | skb = qdisc->dequeue(qdisc); | |
113 | if (skb) { | |
9190b3b3 | 114 | qdisc_bstats_update(sch, skb); |
92651940 AD |
115 | sch->q.qlen--; |
116 | return skb; | |
117 | } | |
118 | } | |
119 | } | |
120 | return NULL; | |
121 | ||
122 | } | |
123 | ||
8e3af978 JP |
124 | static struct sk_buff *multiq_peek(struct Qdisc *sch) |
125 | { | |
126 | struct multiq_sched_data *q = qdisc_priv(sch); | |
127 | unsigned int curband = q->curband; | |
128 | struct Qdisc *qdisc; | |
129 | struct sk_buff *skb; | |
130 | int band; | |
131 | ||
132 | for (band = 0; band < q->bands; band++) { | |
133 | /* cycle through bands to ensure fairness */ | |
134 | curband++; | |
135 | if (curband >= q->bands) | |
136 | curband = 0; | |
137 | ||
138 | /* Check that target subqueue is available before | |
f30ab418 | 139 | * pulling an skb to avoid head-of-line blocking. |
8e3af978 | 140 | */ |
73466498 TH |
141 | if (!netif_xmit_stopped( |
142 | netdev_get_tx_queue(qdisc_dev(sch), curband))) { | |
8e3af978 JP |
143 | qdisc = q->queues[curband]; |
144 | skb = qdisc->ops->peek(qdisc); | |
145 | if (skb) | |
146 | return skb; | |
147 | } | |
148 | } | |
149 | return NULL; | |
150 | ||
151 | } | |
152 | ||
92651940 AD |
153 | static unsigned int multiq_drop(struct Qdisc *sch) |
154 | { | |
155 | struct multiq_sched_data *q = qdisc_priv(sch); | |
156 | int band; | |
157 | unsigned int len; | |
158 | struct Qdisc *qdisc; | |
159 | ||
cc7ec456 | 160 | for (band = q->bands - 1; band >= 0; band--) { |
92651940 AD |
161 | qdisc = q->queues[band]; |
162 | if (qdisc->ops->drop) { | |
163 | len = qdisc->ops->drop(qdisc); | |
164 | if (len != 0) { | |
165 | sch->q.qlen--; | |
166 | return len; | |
167 | } | |
168 | } | |
169 | } | |
170 | return 0; | |
171 | } | |
172 | ||
173 | ||
174 | static void | |
175 | multiq_reset(struct Qdisc *sch) | |
176 | { | |
177 | u16 band; | |
178 | struct multiq_sched_data *q = qdisc_priv(sch); | |
179 | ||
180 | for (band = 0; band < q->bands; band++) | |
181 | qdisc_reset(q->queues[band]); | |
182 | sch->q.qlen = 0; | |
183 | q->curband = 0; | |
184 | } | |
185 | ||
186 | static void | |
187 | multiq_destroy(struct Qdisc *sch) | |
188 | { | |
189 | int band; | |
190 | struct multiq_sched_data *q = qdisc_priv(sch); | |
191 | ||
192 | tcf_destroy_chain(&q->filter_list); | |
193 | for (band = 0; band < q->bands; band++) | |
194 | qdisc_destroy(q->queues[band]); | |
195 | ||
196 | kfree(q->queues); | |
197 | } | |
198 | ||
199 | static int multiq_tune(struct Qdisc *sch, struct nlattr *opt) | |
200 | { | |
201 | struct multiq_sched_data *q = qdisc_priv(sch); | |
202 | struct tc_multiq_qopt *qopt; | |
203 | int i; | |
204 | ||
205 | if (!netif_is_multiqueue(qdisc_dev(sch))) | |
149490f1 | 206 | return -EOPNOTSUPP; |
92651940 AD |
207 | if (nla_len(opt) < sizeof(*qopt)) |
208 | return -EINVAL; | |
209 | ||
210 | qopt = nla_data(opt); | |
211 | ||
212 | qopt->bands = qdisc_dev(sch)->real_num_tx_queues; | |
213 | ||
214 | sch_tree_lock(sch); | |
215 | q->bands = qopt->bands; | |
216 | for (i = q->bands; i < q->max_bands; i++) { | |
f07d1501 | 217 | if (q->queues[i] != &noop_qdisc) { |
b94c8afc PM |
218 | struct Qdisc *child = q->queues[i]; |
219 | q->queues[i] = &noop_qdisc; | |
92651940 AD |
220 | qdisc_tree_decrease_qlen(child, child->q.qlen); |
221 | qdisc_destroy(child); | |
222 | } | |
223 | } | |
224 | ||
225 | sch_tree_unlock(sch); | |
226 | ||
227 | for (i = 0; i < q->bands; i++) { | |
228 | if (q->queues[i] == &noop_qdisc) { | |
b94c8afc | 229 | struct Qdisc *child, *old; |
3511c913 | 230 | child = qdisc_create_dflt(sch->dev_queue, |
92651940 AD |
231 | &pfifo_qdisc_ops, |
232 | TC_H_MAKE(sch->handle, | |
233 | i + 1)); | |
234 | if (child) { | |
235 | sch_tree_lock(sch); | |
b94c8afc PM |
236 | old = q->queues[i]; |
237 | q->queues[i] = child; | |
92651940 | 238 | |
b94c8afc PM |
239 | if (old != &noop_qdisc) { |
240 | qdisc_tree_decrease_qlen(old, | |
241 | old->q.qlen); | |
242 | qdisc_destroy(old); | |
92651940 AD |
243 | } |
244 | sch_tree_unlock(sch); | |
245 | } | |
246 | } | |
247 | } | |
248 | return 0; | |
249 | } | |
250 | ||
251 | static int multiq_init(struct Qdisc *sch, struct nlattr *opt) | |
252 | { | |
253 | struct multiq_sched_data *q = qdisc_priv(sch); | |
f07d1501 | 254 | int i, err; |
92651940 AD |
255 | |
256 | q->queues = NULL; | |
257 | ||
258 | if (opt == NULL) | |
259 | return -EINVAL; | |
260 | ||
261 | q->max_bands = qdisc_dev(sch)->num_tx_queues; | |
262 | ||
263 | q->queues = kcalloc(q->max_bands, sizeof(struct Qdisc *), GFP_KERNEL); | |
264 | if (!q->queues) | |
265 | return -ENOBUFS; | |
266 | for (i = 0; i < q->max_bands; i++) | |
267 | q->queues[i] = &noop_qdisc; | |
268 | ||
cc7ec456 | 269 | err = multiq_tune(sch, opt); |
f07d1501 AD |
270 | |
271 | if (err) | |
272 | kfree(q->queues); | |
273 | ||
274 | return err; | |
92651940 AD |
275 | } |
276 | ||
277 | static int multiq_dump(struct Qdisc *sch, struct sk_buff *skb) | |
278 | { | |
279 | struct multiq_sched_data *q = qdisc_priv(sch); | |
280 | unsigned char *b = skb_tail_pointer(skb); | |
281 | struct tc_multiq_qopt opt; | |
282 | ||
283 | opt.bands = q->bands; | |
284 | opt.max_bands = q->max_bands; | |
285 | ||
1b34ec43 DM |
286 | if (nla_put(skb, TCA_OPTIONS, sizeof(opt), &opt)) |
287 | goto nla_put_failure; | |
92651940 AD |
288 | |
289 | return skb->len; | |
290 | ||
291 | nla_put_failure: | |
292 | nlmsg_trim(skb, b); | |
293 | return -1; | |
294 | } | |
295 | ||
296 | static int multiq_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new, | |
297 | struct Qdisc **old) | |
298 | { | |
299 | struct multiq_sched_data *q = qdisc_priv(sch); | |
300 | unsigned long band = arg - 1; | |
301 | ||
92651940 AD |
302 | if (new == NULL) |
303 | new = &noop_qdisc; | |
304 | ||
305 | sch_tree_lock(sch); | |
306 | *old = q->queues[band]; | |
307 | q->queues[band] = new; | |
308 | qdisc_tree_decrease_qlen(*old, (*old)->q.qlen); | |
309 | qdisc_reset(*old); | |
310 | sch_tree_unlock(sch); | |
311 | ||
312 | return 0; | |
313 | } | |
314 | ||
315 | static struct Qdisc * | |
316 | multiq_leaf(struct Qdisc *sch, unsigned long arg) | |
317 | { | |
318 | struct multiq_sched_data *q = qdisc_priv(sch); | |
319 | unsigned long band = arg - 1; | |
320 | ||
92651940 AD |
321 | return q->queues[band]; |
322 | } | |
323 | ||
324 | static unsigned long multiq_get(struct Qdisc *sch, u32 classid) | |
325 | { | |
326 | struct multiq_sched_data *q = qdisc_priv(sch); | |
327 | unsigned long band = TC_H_MIN(classid); | |
328 | ||
329 | if (band - 1 >= q->bands) | |
330 | return 0; | |
331 | return band; | |
332 | } | |
333 | ||
334 | static unsigned long multiq_bind(struct Qdisc *sch, unsigned long parent, | |
335 | u32 classid) | |
336 | { | |
337 | return multiq_get(sch, classid); | |
338 | } | |
339 | ||
340 | ||
341 | static void multiq_put(struct Qdisc *q, unsigned long cl) | |
342 | { | |
92651940 AD |
343 | } |
344 | ||
92651940 AD |
345 | static int multiq_dump_class(struct Qdisc *sch, unsigned long cl, |
346 | struct sk_buff *skb, struct tcmsg *tcm) | |
347 | { | |
348 | struct multiq_sched_data *q = qdisc_priv(sch); | |
349 | ||
92651940 | 350 | tcm->tcm_handle |= TC_H_MIN(cl); |
cc7ec456 | 351 | tcm->tcm_info = q->queues[cl - 1]->handle; |
92651940 AD |
352 | return 0; |
353 | } | |
354 | ||
355 | static int multiq_dump_class_stats(struct Qdisc *sch, unsigned long cl, | |
356 | struct gnet_dump *d) | |
357 | { | |
358 | struct multiq_sched_data *q = qdisc_priv(sch); | |
359 | struct Qdisc *cl_q; | |
360 | ||
361 | cl_q = q->queues[cl - 1]; | |
a19d2158 | 362 | cl_q->qstats.qlen = cl_q->q.qlen; |
92651940 AD |
363 | if (gnet_stats_copy_basic(d, &cl_q->bstats) < 0 || |
364 | gnet_stats_copy_queue(d, &cl_q->qstats) < 0) | |
365 | return -1; | |
366 | ||
367 | return 0; | |
368 | } | |
369 | ||
370 | static void multiq_walk(struct Qdisc *sch, struct qdisc_walker *arg) | |
371 | { | |
372 | struct multiq_sched_data *q = qdisc_priv(sch); | |
373 | int band; | |
374 | ||
375 | if (arg->stop) | |
376 | return; | |
377 | ||
378 | for (band = 0; band < q->bands; band++) { | |
379 | if (arg->count < arg->skip) { | |
380 | arg->count++; | |
381 | continue; | |
382 | } | |
cc7ec456 | 383 | if (arg->fn(sch, band + 1, arg) < 0) { |
92651940 AD |
384 | arg->stop = 1; |
385 | break; | |
386 | } | |
387 | arg->count++; | |
388 | } | |
389 | } | |
390 | ||
391 | static struct tcf_proto **multiq_find_tcf(struct Qdisc *sch, unsigned long cl) | |
392 | { | |
393 | struct multiq_sched_data *q = qdisc_priv(sch); | |
394 | ||
395 | if (cl) | |
396 | return NULL; | |
397 | return &q->filter_list; | |
398 | } | |
399 | ||
400 | static const struct Qdisc_class_ops multiq_class_ops = { | |
401 | .graft = multiq_graft, | |
402 | .leaf = multiq_leaf, | |
403 | .get = multiq_get, | |
404 | .put = multiq_put, | |
92651940 AD |
405 | .walk = multiq_walk, |
406 | .tcf_chain = multiq_find_tcf, | |
407 | .bind_tcf = multiq_bind, | |
408 | .unbind_tcf = multiq_put, | |
409 | .dump = multiq_dump_class, | |
410 | .dump_stats = multiq_dump_class_stats, | |
411 | }; | |
412 | ||
413 | static struct Qdisc_ops multiq_qdisc_ops __read_mostly = { | |
414 | .next = NULL, | |
415 | .cl_ops = &multiq_class_ops, | |
416 | .id = "multiq", | |
417 | .priv_size = sizeof(struct multiq_sched_data), | |
418 | .enqueue = multiq_enqueue, | |
419 | .dequeue = multiq_dequeue, | |
8e3af978 | 420 | .peek = multiq_peek, |
92651940 AD |
421 | .drop = multiq_drop, |
422 | .init = multiq_init, | |
423 | .reset = multiq_reset, | |
424 | .destroy = multiq_destroy, | |
425 | .change = multiq_tune, | |
426 | .dump = multiq_dump, | |
427 | .owner = THIS_MODULE, | |
428 | }; | |
429 | ||
430 | static int __init multiq_module_init(void) | |
431 | { | |
432 | return register_qdisc(&multiq_qdisc_ops); | |
433 | } | |
434 | ||
435 | static void __exit multiq_module_exit(void) | |
436 | { | |
437 | unregister_qdisc(&multiq_qdisc_ops); | |
438 | } | |
439 | ||
440 | module_init(multiq_module_init) | |
441 | module_exit(multiq_module_exit) | |
442 | ||
443 | MODULE_LICENSE("GPL"); |