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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 | 56 | *qerr = NET_XMIT_SUCCESS | __NET_XMIT_STOLEN; |
f3ae608e | 57 | /* fall through */ |
92651940 AD |
58 | case TC_ACT_SHOT: |
59 | return NULL; | |
60 | } | |
61 | #endif | |
62 | band = skb_get_queue_mapping(skb); | |
63 | ||
64 | if (band >= q->bands) | |
65 | return q->queues[0]; | |
66 | ||
67 | return q->queues[band]; | |
68 | } | |
69 | ||
70 | static int | |
520ac30f ED |
71 | multiq_enqueue(struct sk_buff *skb, struct Qdisc *sch, |
72 | struct sk_buff **to_free) | |
92651940 AD |
73 | { |
74 | struct Qdisc *qdisc; | |
75 | int ret; | |
76 | ||
77 | qdisc = multiq_classify(skb, sch, &ret); | |
78 | #ifdef CONFIG_NET_CLS_ACT | |
79 | if (qdisc == NULL) { | |
80 | ||
81 | if (ret & __NET_XMIT_BYPASS) | |
25331d6c | 82 | qdisc_qstats_drop(sch); |
520ac30f | 83 | __qdisc_drop(skb, to_free); |
92651940 AD |
84 | return ret; |
85 | } | |
86 | #endif | |
87 | ||
520ac30f | 88 | ret = qdisc_enqueue(skb, qdisc, to_free); |
92651940 | 89 | if (ret == NET_XMIT_SUCCESS) { |
92651940 AD |
90 | sch->q.qlen++; |
91 | return NET_XMIT_SUCCESS; | |
92 | } | |
93 | if (net_xmit_drop_count(ret)) | |
25331d6c | 94 | qdisc_qstats_drop(sch); |
92651940 AD |
95 | return ret; |
96 | } | |
97 | ||
92651940 AD |
98 | static struct sk_buff *multiq_dequeue(struct Qdisc *sch) |
99 | { | |
100 | struct multiq_sched_data *q = qdisc_priv(sch); | |
101 | struct Qdisc *qdisc; | |
102 | struct sk_buff *skb; | |
103 | int band; | |
104 | ||
105 | for (band = 0; band < q->bands; band++) { | |
106 | /* cycle through bands to ensure fairness */ | |
107 | q->curband++; | |
108 | if (q->curband >= q->bands) | |
109 | q->curband = 0; | |
110 | ||
111 | /* Check that target subqueue is available before | |
f30ab418 | 112 | * pulling an skb to avoid head-of-line blocking. |
92651940 | 113 | */ |
73466498 TH |
114 | if (!netif_xmit_stopped( |
115 | netdev_get_tx_queue(qdisc_dev(sch), q->curband))) { | |
92651940 AD |
116 | qdisc = q->queues[q->curband]; |
117 | skb = qdisc->dequeue(qdisc); | |
118 | if (skb) { | |
9190b3b3 | 119 | qdisc_bstats_update(sch, skb); |
92651940 AD |
120 | sch->q.qlen--; |
121 | return skb; | |
122 | } | |
123 | } | |
124 | } | |
125 | return NULL; | |
126 | ||
127 | } | |
128 | ||
8e3af978 JP |
129 | static struct sk_buff *multiq_peek(struct Qdisc *sch) |
130 | { | |
131 | struct multiq_sched_data *q = qdisc_priv(sch); | |
132 | unsigned int curband = q->curband; | |
133 | struct Qdisc *qdisc; | |
134 | struct sk_buff *skb; | |
135 | int band; | |
136 | ||
137 | for (band = 0; band < q->bands; band++) { | |
138 | /* cycle through bands to ensure fairness */ | |
139 | curband++; | |
140 | if (curband >= q->bands) | |
141 | curband = 0; | |
142 | ||
143 | /* Check that target subqueue is available before | |
f30ab418 | 144 | * pulling an skb to avoid head-of-line blocking. |
8e3af978 | 145 | */ |
73466498 TH |
146 | if (!netif_xmit_stopped( |
147 | netdev_get_tx_queue(qdisc_dev(sch), curband))) { | |
8e3af978 JP |
148 | qdisc = q->queues[curband]; |
149 | skb = qdisc->ops->peek(qdisc); | |
150 | if (skb) | |
151 | return skb; | |
152 | } | |
153 | } | |
154 | return NULL; | |
155 | ||
156 | } | |
157 | ||
92651940 AD |
158 | static void |
159 | multiq_reset(struct Qdisc *sch) | |
160 | { | |
161 | u16 band; | |
162 | struct multiq_sched_data *q = qdisc_priv(sch); | |
163 | ||
164 | for (band = 0; band < q->bands; band++) | |
165 | qdisc_reset(q->queues[band]); | |
166 | sch->q.qlen = 0; | |
167 | q->curband = 0; | |
168 | } | |
169 | ||
170 | static void | |
171 | multiq_destroy(struct Qdisc *sch) | |
172 | { | |
173 | int band; | |
174 | struct multiq_sched_data *q = qdisc_priv(sch); | |
175 | ||
6529eaba | 176 | tcf_block_put(q->block); |
92651940 | 177 | for (band = 0; band < q->bands; band++) |
86bd446b | 178 | qdisc_put(q->queues[band]); |
92651940 AD |
179 | |
180 | kfree(q->queues); | |
181 | } | |
182 | ||
2030721c AA |
183 | static int multiq_tune(struct Qdisc *sch, struct nlattr *opt, |
184 | struct netlink_ext_ack *extack) | |
92651940 AD |
185 | { |
186 | struct multiq_sched_data *q = qdisc_priv(sch); | |
187 | struct tc_multiq_qopt *qopt; | |
188 | int i; | |
189 | ||
190 | if (!netif_is_multiqueue(qdisc_dev(sch))) | |
149490f1 | 191 | return -EOPNOTSUPP; |
92651940 AD |
192 | if (nla_len(opt) < sizeof(*qopt)) |
193 | return -EINVAL; | |
194 | ||
195 | qopt = nla_data(opt); | |
196 | ||
197 | qopt->bands = qdisc_dev(sch)->real_num_tx_queues; | |
198 | ||
199 | sch_tree_lock(sch); | |
200 | q->bands = qopt->bands; | |
201 | for (i = q->bands; i < q->max_bands; i++) { | |
f07d1501 | 202 | if (q->queues[i] != &noop_qdisc) { |
b94c8afc | 203 | struct Qdisc *child = q->queues[i]; |
e5f0e8f8 | 204 | |
b94c8afc | 205 | q->queues[i] = &noop_qdisc; |
e5f0e8f8 | 206 | qdisc_tree_flush_backlog(child); |
86bd446b | 207 | qdisc_put(child); |
92651940 AD |
208 | } |
209 | } | |
210 | ||
211 | sch_tree_unlock(sch); | |
212 | ||
213 | for (i = 0; i < q->bands; i++) { | |
214 | if (q->queues[i] == &noop_qdisc) { | |
b94c8afc | 215 | struct Qdisc *child, *old; |
3511c913 | 216 | child = qdisc_create_dflt(sch->dev_queue, |
92651940 AD |
217 | &pfifo_qdisc_ops, |
218 | TC_H_MAKE(sch->handle, | |
a38a9882 | 219 | i + 1), extack); |
92651940 AD |
220 | if (child) { |
221 | sch_tree_lock(sch); | |
b94c8afc PM |
222 | old = q->queues[i]; |
223 | q->queues[i] = child; | |
49b49971 JK |
224 | if (child != &noop_qdisc) |
225 | qdisc_hash_add(child, true); | |
92651940 | 226 | |
b94c8afc | 227 | if (old != &noop_qdisc) { |
e5f0e8f8 | 228 | qdisc_tree_flush_backlog(old); |
86bd446b | 229 | qdisc_put(old); |
92651940 AD |
230 | } |
231 | sch_tree_unlock(sch); | |
232 | } | |
233 | } | |
234 | } | |
235 | return 0; | |
236 | } | |
237 | ||
e63d7dfd AA |
238 | static int multiq_init(struct Qdisc *sch, struct nlattr *opt, |
239 | struct netlink_ext_ack *extack) | |
92651940 AD |
240 | { |
241 | struct multiq_sched_data *q = qdisc_priv(sch); | |
f07d1501 | 242 | int i, err; |
92651940 AD |
243 | |
244 | q->queues = NULL; | |
245 | ||
ac8ef4ab | 246 | if (!opt) |
92651940 AD |
247 | return -EINVAL; |
248 | ||
8d1a77f9 | 249 | err = tcf_block_get(&q->block, &q->filter_list, sch, extack); |
6529eaba JP |
250 | if (err) |
251 | return err; | |
252 | ||
92651940 AD |
253 | q->max_bands = qdisc_dev(sch)->num_tx_queues; |
254 | ||
255 | q->queues = kcalloc(q->max_bands, sizeof(struct Qdisc *), GFP_KERNEL); | |
256 | if (!q->queues) | |
257 | return -ENOBUFS; | |
258 | for (i = 0; i < q->max_bands; i++) | |
259 | q->queues[i] = &noop_qdisc; | |
260 | ||
2030721c | 261 | return multiq_tune(sch, opt, extack); |
92651940 AD |
262 | } |
263 | ||
264 | static int multiq_dump(struct Qdisc *sch, struct sk_buff *skb) | |
265 | { | |
266 | struct multiq_sched_data *q = qdisc_priv(sch); | |
267 | unsigned char *b = skb_tail_pointer(skb); | |
268 | struct tc_multiq_qopt opt; | |
269 | ||
270 | opt.bands = q->bands; | |
271 | opt.max_bands = q->max_bands; | |
272 | ||
1b34ec43 DM |
273 | if (nla_put(skb, TCA_OPTIONS, sizeof(opt), &opt)) |
274 | goto nla_put_failure; | |
92651940 AD |
275 | |
276 | return skb->len; | |
277 | ||
278 | nla_put_failure: | |
279 | nlmsg_trim(skb, b); | |
280 | return -1; | |
281 | } | |
282 | ||
283 | static int multiq_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new, | |
653d6fd6 | 284 | struct Qdisc **old, struct netlink_ext_ack *extack) |
92651940 AD |
285 | { |
286 | struct multiq_sched_data *q = qdisc_priv(sch); | |
287 | unsigned long band = arg - 1; | |
288 | ||
92651940 AD |
289 | if (new == NULL) |
290 | new = &noop_qdisc; | |
291 | ||
86a7996c | 292 | *old = qdisc_replace(sch, new, &q->queues[band]); |
92651940 AD |
293 | return 0; |
294 | } | |
295 | ||
296 | static struct Qdisc * | |
297 | multiq_leaf(struct Qdisc *sch, unsigned long arg) | |
298 | { | |
299 | struct multiq_sched_data *q = qdisc_priv(sch); | |
300 | unsigned long band = arg - 1; | |
301 | ||
92651940 AD |
302 | return q->queues[band]; |
303 | } | |
304 | ||
143976ce | 305 | static unsigned long multiq_find(struct Qdisc *sch, u32 classid) |
92651940 AD |
306 | { |
307 | struct multiq_sched_data *q = qdisc_priv(sch); | |
308 | unsigned long band = TC_H_MIN(classid); | |
309 | ||
310 | if (band - 1 >= q->bands) | |
311 | return 0; | |
312 | return band; | |
313 | } | |
314 | ||
315 | static unsigned long multiq_bind(struct Qdisc *sch, unsigned long parent, | |
316 | u32 classid) | |
317 | { | |
143976ce | 318 | return multiq_find(sch, classid); |
92651940 AD |
319 | } |
320 | ||
321 | ||
143976ce | 322 | static void multiq_unbind(struct Qdisc *q, unsigned long cl) |
92651940 | 323 | { |
92651940 AD |
324 | } |
325 | ||
92651940 AD |
326 | static int multiq_dump_class(struct Qdisc *sch, unsigned long cl, |
327 | struct sk_buff *skb, struct tcmsg *tcm) | |
328 | { | |
329 | struct multiq_sched_data *q = qdisc_priv(sch); | |
330 | ||
92651940 | 331 | tcm->tcm_handle |= TC_H_MIN(cl); |
cc7ec456 | 332 | tcm->tcm_info = q->queues[cl - 1]->handle; |
92651940 AD |
333 | return 0; |
334 | } | |
335 | ||
336 | static int multiq_dump_class_stats(struct Qdisc *sch, unsigned long cl, | |
337 | struct gnet_dump *d) | |
338 | { | |
339 | struct multiq_sched_data *q = qdisc_priv(sch); | |
340 | struct Qdisc *cl_q; | |
341 | ||
342 | cl_q = q->queues[cl - 1]; | |
edb09eb1 ED |
343 | if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch), |
344 | d, NULL, &cl_q->bstats) < 0 || | |
5dd431b6 | 345 | qdisc_qstats_copy(d, cl_q) < 0) |
92651940 AD |
346 | return -1; |
347 | ||
348 | return 0; | |
349 | } | |
350 | ||
351 | static void multiq_walk(struct Qdisc *sch, struct qdisc_walker *arg) | |
352 | { | |
353 | struct multiq_sched_data *q = qdisc_priv(sch); | |
354 | int band; | |
355 | ||
356 | if (arg->stop) | |
357 | return; | |
358 | ||
359 | for (band = 0; band < q->bands; band++) { | |
360 | if (arg->count < arg->skip) { | |
361 | arg->count++; | |
362 | continue; | |
363 | } | |
cc7ec456 | 364 | if (arg->fn(sch, band + 1, arg) < 0) { |
92651940 AD |
365 | arg->stop = 1; |
366 | break; | |
367 | } | |
368 | arg->count++; | |
369 | } | |
370 | } | |
371 | ||
cbaacc4e AA |
372 | static struct tcf_block *multiq_tcf_block(struct Qdisc *sch, unsigned long cl, |
373 | struct netlink_ext_ack *extack) | |
92651940 AD |
374 | { |
375 | struct multiq_sched_data *q = qdisc_priv(sch); | |
376 | ||
377 | if (cl) | |
378 | return NULL; | |
6529eaba | 379 | return q->block; |
92651940 AD |
380 | } |
381 | ||
382 | static const struct Qdisc_class_ops multiq_class_ops = { | |
383 | .graft = multiq_graft, | |
384 | .leaf = multiq_leaf, | |
143976ce | 385 | .find = multiq_find, |
92651940 | 386 | .walk = multiq_walk, |
6529eaba | 387 | .tcf_block = multiq_tcf_block, |
92651940 | 388 | .bind_tcf = multiq_bind, |
143976ce | 389 | .unbind_tcf = multiq_unbind, |
92651940 AD |
390 | .dump = multiq_dump_class, |
391 | .dump_stats = multiq_dump_class_stats, | |
392 | }; | |
393 | ||
394 | static struct Qdisc_ops multiq_qdisc_ops __read_mostly = { | |
395 | .next = NULL, | |
396 | .cl_ops = &multiq_class_ops, | |
397 | .id = "multiq", | |
398 | .priv_size = sizeof(struct multiq_sched_data), | |
399 | .enqueue = multiq_enqueue, | |
400 | .dequeue = multiq_dequeue, | |
8e3af978 | 401 | .peek = multiq_peek, |
92651940 AD |
402 | .init = multiq_init, |
403 | .reset = multiq_reset, | |
404 | .destroy = multiq_destroy, | |
405 | .change = multiq_tune, | |
406 | .dump = multiq_dump, | |
407 | .owner = THIS_MODULE, | |
408 | }; | |
409 | ||
410 | static int __init multiq_module_init(void) | |
411 | { | |
412 | return register_qdisc(&multiq_qdisc_ops); | |
413 | } | |
414 | ||
415 | static void __exit multiq_module_exit(void) | |
416 | { | |
417 | unregister_qdisc(&multiq_qdisc_ops); | |
418 | } | |
419 | ||
420 | module_init(multiq_module_init) | |
421 | module_exit(multiq_module_exit) | |
422 | ||
423 | MODULE_LICENSE("GPL"); |