blob: 31e0a284eeff963c29d310156d8d4e51860f8c09 [file] [log] [blame]
Alexander Duyck92651942008-09-12 16:29:34 -07001/*
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
Jeff Kirsherc057b192013-12-06 09:13:44 -080014 * this program; if not, see <http://www.gnu.org/licenses/>.
Alexander Duyck92651942008-09-12 16:29:34 -070015 *
16 * Author: Alexander Duyck <alexander.h.duyck@intel.com>
17 */
18
19#include <linux/module.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090020#include <linux/slab.h>
Alexander Duyck92651942008-09-12 16:29:34 -070021#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>
Jiri Pirkocf1facd2017-02-09 14:38:56 +010028#include <net/pkt_cls.h>
Alexander Duyck92651942008-09-12 16:29:34 -070029
30struct multiq_sched_data {
31 u16 bands;
32 u16 max_bands;
33 u16 curband;
John Fastabend25d8c0d2014-09-12 20:05:27 -070034 struct tcf_proto __rcu *filter_list;
Jiri Pirko6529eab2017-05-17 11:07:55 +020035 struct tcf_block *block;
Alexander Duyck92651942008-09-12 16:29:34 -070036 struct Qdisc **queues;
37};
38
39
40static struct Qdisc *
41multiq_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;
John Fastabend25d8c0d2014-09-12 20:05:27 -070046 struct tcf_proto *fl = rcu_dereference_bh(q->filter_list);
Alexander Duyck92651942008-09-12 16:29:34 -070047 int err;
48
49 *qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
Jiri Pirko87d83092017-05-17 11:07:54 +020050 err = tcf_classify(skb, fl, &res, false);
Alexander Duyck92651942008-09-12 16:29:34 -070051#ifdef CONFIG_NET_CLS_ACT
52 switch (err) {
53 case TC_ACT_STOLEN:
54 case TC_ACT_QUEUED:
Jiri Pirkoe25ea212017-06-06 14:12:02 +020055 case TC_ACT_TRAP:
Alexander Duyck92651942008-09-12 16:29:34 -070056 *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
69static int
Eric Dumazet520ac302016-06-21 23:16:49 -070070multiq_enqueue(struct sk_buff *skb, struct Qdisc *sch,
71 struct sk_buff **to_free)
Alexander Duyck92651942008-09-12 16:29:34 -070072{
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)
John Fastabend25331d62014-09-28 11:53:29 -070081 qdisc_qstats_drop(sch);
Eric Dumazet520ac302016-06-21 23:16:49 -070082 __qdisc_drop(skb, to_free);
Alexander Duyck92651942008-09-12 16:29:34 -070083 return ret;
84 }
85#endif
86
Eric Dumazet520ac302016-06-21 23:16:49 -070087 ret = qdisc_enqueue(skb, qdisc, to_free);
Alexander Duyck92651942008-09-12 16:29:34 -070088 if (ret == NET_XMIT_SUCCESS) {
Alexander Duyck92651942008-09-12 16:29:34 -070089 sch->q.qlen++;
90 return NET_XMIT_SUCCESS;
91 }
92 if (net_xmit_drop_count(ret))
John Fastabend25331d62014-09-28 11:53:29 -070093 qdisc_qstats_drop(sch);
Alexander Duyck92651942008-09-12 16:29:34 -070094 return ret;
95}
96
Alexander Duyck92651942008-09-12 16:29:34 -070097static 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
Jarek Poplawskif30ab412008-11-13 22:56:30 -0800111 * pulling an skb to avoid head-of-line blocking.
Alexander Duyck92651942008-09-12 16:29:34 -0700112 */
Tom Herbert734664982011-11-28 16:32:44 +0000113 if (!netif_xmit_stopped(
114 netdev_get_tx_queue(qdisc_dev(sch), q->curband))) {
Alexander Duyck92651942008-09-12 16:29:34 -0700115 qdisc = q->queues[q->curband];
116 skb = qdisc->dequeue(qdisc);
117 if (skb) {
Eric Dumazet9190b3b2011-01-20 23:31:33 -0800118 qdisc_bstats_update(sch, skb);
Alexander Duyck92651942008-09-12 16:29:34 -0700119 sch->q.qlen--;
120 return skb;
121 }
122 }
123 }
124 return NULL;
125
126}
127
Jarek Poplawski8e3af972008-10-31 00:45:55 -0700128static 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
Jarek Poplawskif30ab412008-11-13 22:56:30 -0800143 * pulling an skb to avoid head-of-line blocking.
Jarek Poplawski8e3af972008-10-31 00:45:55 -0700144 */
Tom Herbert734664982011-11-28 16:32:44 +0000145 if (!netif_xmit_stopped(
146 netdev_get_tx_queue(qdisc_dev(sch), curband))) {
Jarek Poplawski8e3af972008-10-31 00:45:55 -0700147 qdisc = q->queues[curband];
148 skb = qdisc->ops->peek(qdisc);
149 if (skb)
150 return skb;
151 }
152 }
153 return NULL;
154
155}
156
Alexander Duyck92651942008-09-12 16:29:34 -0700157static void
158multiq_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
169static void
170multiq_destroy(struct Qdisc *sch)
171{
172 int band;
173 struct multiq_sched_data *q = qdisc_priv(sch);
174
Jiri Pirko6529eab2017-05-17 11:07:55 +0200175 tcf_block_put(q->block);
Alexander Duyck92651942008-09-12 16:29:34 -0700176 for (band = 0; band < q->bands; band++)
177 qdisc_destroy(q->queues[band]);
178
179 kfree(q->queues);
180}
181
182static 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)))
Jarek Poplawski149490f2009-02-10 00:11:21 -0800189 return -EOPNOTSUPP;
Alexander Duyck92651942008-09-12 16:29:34 -0700190 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++) {
Alexander Duyckf07d1502008-09-12 17:57:23 -0700200 if (q->queues[i] != &noop_qdisc) {
Patrick McHardyb94c8af2008-11-20 04:11:36 -0800201 struct Qdisc *child = q->queues[i];
202 q->queues[i] = &noop_qdisc;
WANG Cong2ccccf52016-02-25 14:55:01 -0800203 qdisc_tree_reduce_backlog(child, child->q.qlen,
204 child->qstats.backlog);
Alexander Duyck92651942008-09-12 16:29:34 -0700205 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) {
Patrick McHardyb94c8af2008-11-20 04:11:36 -0800213 struct Qdisc *child, *old;
Changli Gao3511c912010-10-16 13:04:08 +0000214 child = qdisc_create_dflt(sch->dev_queue,
Alexander Duyck92651942008-09-12 16:29:34 -0700215 &pfifo_qdisc_ops,
216 TC_H_MAKE(sch->handle,
217 i + 1));
218 if (child) {
219 sch_tree_lock(sch);
Patrick McHardyb94c8af2008-11-20 04:11:36 -0800220 old = q->queues[i];
221 q->queues[i] = child;
Jiri Kosina49b49972017-03-08 16:03:32 +0100222 if (child != &noop_qdisc)
223 qdisc_hash_add(child, true);
Alexander Duyck92651942008-09-12 16:29:34 -0700224
Patrick McHardyb94c8af2008-11-20 04:11:36 -0800225 if (old != &noop_qdisc) {
WANG Cong2ccccf52016-02-25 14:55:01 -0800226 qdisc_tree_reduce_backlog(old,
227 old->q.qlen,
228 old->qstats.backlog);
Patrick McHardyb94c8af2008-11-20 04:11:36 -0800229 qdisc_destroy(old);
Alexander Duyck92651942008-09-12 16:29:34 -0700230 }
231 sch_tree_unlock(sch);
232 }
233 }
234 }
235 return 0;
236}
237
238static int multiq_init(struct Qdisc *sch, struct nlattr *opt)
239{
240 struct multiq_sched_data *q = qdisc_priv(sch);
Alexander Duyckf07d1502008-09-12 17:57:23 -0700241 int i, err;
Alexander Duyck92651942008-09-12 16:29:34 -0700242
243 q->queues = NULL;
244
245 if (opt == NULL)
246 return -EINVAL;
247
Jiri Pirko69d78ef2017-10-13 14:00:57 +0200248 err = tcf_block_get(&q->block, &q->filter_list, sch);
Jiri Pirko6529eab2017-05-17 11:07:55 +0200249 if (err)
250 return err;
251
Alexander Duyck92651942008-09-12 16:29:34 -0700252 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
Nikolay Aleksandrove89d4692017-08-30 12:48:58 +0300260 return multiq_tune(sch, opt);
Alexander Duyck92651942008-09-12 16:29:34 -0700261}
262
263static 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
David S. Miller1b34ec42012-03-29 05:11:39 -0400272 if (nla_put(skb, TCA_OPTIONS, sizeof(opt), &opt))
273 goto nla_put_failure;
Alexander Duyck92651942008-09-12 16:29:34 -0700274
275 return skb->len;
276
277nla_put_failure:
278 nlmsg_trim(skb, b);
279 return -1;
280}
281
282static 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
Alexander Duyck92651942008-09-12 16:29:34 -0700288 if (new == NULL)
289 new = &noop_qdisc;
290
WANG Cong86a79962016-02-25 14:55:00 -0800291 *old = qdisc_replace(sch, new, &q->queues[band]);
Alexander Duyck92651942008-09-12 16:29:34 -0700292 return 0;
293}
294
295static struct Qdisc *
296multiq_leaf(struct Qdisc *sch, unsigned long arg)
297{
298 struct multiq_sched_data *q = qdisc_priv(sch);
299 unsigned long band = arg - 1;
300
Alexander Duyck92651942008-09-12 16:29:34 -0700301 return q->queues[band];
302}
303
WANG Cong143976c2017-08-24 16:51:29 -0700304static unsigned long multiq_find(struct Qdisc *sch, u32 classid)
Alexander Duyck92651942008-09-12 16:29:34 -0700305{
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
314static unsigned long multiq_bind(struct Qdisc *sch, unsigned long parent,
315 u32 classid)
316{
WANG Cong143976c2017-08-24 16:51:29 -0700317 return multiq_find(sch, classid);
Alexander Duyck92651942008-09-12 16:29:34 -0700318}
319
320
WANG Cong143976c2017-08-24 16:51:29 -0700321static void multiq_unbind(struct Qdisc *q, unsigned long cl)
Alexander Duyck92651942008-09-12 16:29:34 -0700322{
Alexander Duyck92651942008-09-12 16:29:34 -0700323}
324
Alexander Duyck92651942008-09-12 16:29:34 -0700325static 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
Alexander Duyck92651942008-09-12 16:29:34 -0700330 tcm->tcm_handle |= TC_H_MIN(cl);
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000331 tcm->tcm_info = q->queues[cl - 1]->handle;
Alexander Duyck92651942008-09-12 16:29:34 -0700332 return 0;
333}
334
335static 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];
Eric Dumazetedb09eb2016-06-06 09:37:16 -0700342 if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch),
343 d, NULL, &cl_q->bstats) < 0 ||
John Fastabendb0ab6f92014-09-28 11:54:24 -0700344 gnet_stats_copy_queue(d, NULL, &cl_q->qstats, cl_q->q.qlen) < 0)
Alexander Duyck92651942008-09-12 16:29:34 -0700345 return -1;
346
347 return 0;
348}
349
350static 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 }
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000363 if (arg->fn(sch, band + 1, arg) < 0) {
Alexander Duyck92651942008-09-12 16:29:34 -0700364 arg->stop = 1;
365 break;
366 }
367 arg->count++;
368 }
369}
370
Jiri Pirko6529eab2017-05-17 11:07:55 +0200371static struct tcf_block *multiq_tcf_block(struct Qdisc *sch, unsigned long cl)
Alexander Duyck92651942008-09-12 16:29:34 -0700372{
373 struct multiq_sched_data *q = qdisc_priv(sch);
374
375 if (cl)
376 return NULL;
Jiri Pirko6529eab2017-05-17 11:07:55 +0200377 return q->block;
Alexander Duyck92651942008-09-12 16:29:34 -0700378}
379
380static const struct Qdisc_class_ops multiq_class_ops = {
381 .graft = multiq_graft,
382 .leaf = multiq_leaf,
WANG Cong143976c2017-08-24 16:51:29 -0700383 .find = multiq_find,
Alexander Duyck92651942008-09-12 16:29:34 -0700384 .walk = multiq_walk,
Jiri Pirko6529eab2017-05-17 11:07:55 +0200385 .tcf_block = multiq_tcf_block,
Alexander Duyck92651942008-09-12 16:29:34 -0700386 .bind_tcf = multiq_bind,
WANG Cong143976c2017-08-24 16:51:29 -0700387 .unbind_tcf = multiq_unbind,
Alexander Duyck92651942008-09-12 16:29:34 -0700388 .dump = multiq_dump_class,
389 .dump_stats = multiq_dump_class_stats,
390};
391
392static 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,
Jarek Poplawski8e3af972008-10-31 00:45:55 -0700399 .peek = multiq_peek,
Alexander Duyck92651942008-09-12 16:29:34 -0700400 .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
408static int __init multiq_module_init(void)
409{
410 return register_qdisc(&multiq_qdisc_ops);
411}
412
413static void __exit multiq_module_exit(void)
414{
415 unregister_qdisc(&multiq_qdisc_ops);
416}
417
418module_init(multiq_module_init)
419module_exit(multiq_module_exit)
420
421MODULE_LICENSE("GPL");