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-rw-r--r--net/sched/sch_multiq.c477
1 files changed, 477 insertions, 0 deletions
diff --git a/net/sched/sch_multiq.c b/net/sched/sch_multiq.c
new file mode 100644
index 000000000000..915f3149dde2
--- /dev/null
+++ b/net/sched/sch_multiq.c
@@ -0,0 +1,477 @@
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
14 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
15 * Place - Suite 330, Boston, MA 02111-1307 USA.
16 *
17 * Author: Alexander Duyck <alexander.h.duyck@intel.com>
18 */
19
20#include <linux/module.h>
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
30struct 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
39static struct Qdisc *
40multiq_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
66static int
67multiq_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) {
85 sch->bstats.bytes += qdisc_pkt_len(skb);
86 sch->bstats.packets++;
87 sch->q.qlen++;
88 return NET_XMIT_SUCCESS;
89 }
90 if (net_xmit_drop_count(ret))
91 sch->qstats.drops++;
92 return ret;
93}
94
95
96static int
97multiq_requeue(struct sk_buff *skb, struct Qdisc *sch)
98{
99 struct Qdisc *qdisc;
100 struct multiq_sched_data *q = qdisc_priv(sch);
101 int ret;
102
103 qdisc = multiq_classify(skb, sch, &ret);
104#ifdef CONFIG_NET_CLS_ACT
105 if (qdisc == NULL) {
106 if (ret & __NET_XMIT_BYPASS)
107 sch->qstats.drops++;
108 kfree_skb(skb);
109 return ret;
110 }
111#endif
112
113 ret = qdisc->ops->requeue(skb, qdisc);
114 if (ret == NET_XMIT_SUCCESS) {
115 sch->q.qlen++;
116 sch->qstats.requeues++;
117 if (q->curband)
118 q->curband--;
119 else
120 q->curband = q->bands - 1;
121 return NET_XMIT_SUCCESS;
122 }
123 if (net_xmit_drop_count(ret))
124 sch->qstats.drops++;
125 return ret;
126}
127
128
129static struct sk_buff *multiq_dequeue(struct Qdisc *sch)
130{
131 struct multiq_sched_data *q = qdisc_priv(sch);
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 q->curband++;
139 if (q->curband >= q->bands)
140 q->curband = 0;
141
142 /* Check that target subqueue is available before
143 * pulling an skb to avoid excessive requeues
144 */
145 if (!__netif_subqueue_stopped(qdisc_dev(sch), q->curband)) {
146 qdisc = q->queues[q->curband];
147 skb = qdisc->dequeue(qdisc);
148 if (skb) {
149 sch->q.qlen--;
150 return skb;
151 }
152 }
153 }
154 return NULL;
155
156}
157
158static unsigned int multiq_drop(struct Qdisc *sch)
159{
160 struct multiq_sched_data *q = qdisc_priv(sch);
161 int band;
162 unsigned int len;
163 struct Qdisc *qdisc;
164
165 for (band = q->bands-1; band >= 0; band--) {
166 qdisc = q->queues[band];
167 if (qdisc->ops->drop) {
168 len = qdisc->ops->drop(qdisc);
169 if (len != 0) {
170 sch->q.qlen--;
171 return len;
172 }
173 }
174 }
175 return 0;
176}
177
178
179static void
180multiq_reset(struct Qdisc *sch)
181{
182 u16 band;
183 struct multiq_sched_data *q = qdisc_priv(sch);
184
185 for (band = 0; band < q->bands; band++)
186 qdisc_reset(q->queues[band]);
187 sch->q.qlen = 0;
188 q->curband = 0;
189}
190
191static void
192multiq_destroy(struct Qdisc *sch)
193{
194 int band;
195 struct multiq_sched_data *q = qdisc_priv(sch);
196
197 tcf_destroy_chain(&q->filter_list);
198 for (band = 0; band < q->bands; band++)
199 qdisc_destroy(q->queues[band]);
200
201 kfree(q->queues);
202}
203
204static int multiq_tune(struct Qdisc *sch, struct nlattr *opt)
205{
206 struct multiq_sched_data *q = qdisc_priv(sch);
207 struct tc_multiq_qopt *qopt;
208 int i;
209
210 if (!netif_is_multiqueue(qdisc_dev(sch)))
211 return -EINVAL;
212 if (nla_len(opt) < sizeof(*qopt))
213 return -EINVAL;
214
215 qopt = nla_data(opt);
216
217 qopt->bands = qdisc_dev(sch)->real_num_tx_queues;
218
219 sch_tree_lock(sch);
220 q->bands = qopt->bands;
221 for (i = q->bands; i < q->max_bands; i++) {
222 if (q->queues[i] != &noop_qdisc) {
223 struct Qdisc *child = xchg(&q->queues[i], &noop_qdisc);
224 qdisc_tree_decrease_qlen(child, child->q.qlen);
225 qdisc_destroy(child);
226 }
227 }
228
229 sch_tree_unlock(sch);
230
231 for (i = 0; i < q->bands; i++) {
232 if (q->queues[i] == &noop_qdisc) {
233 struct Qdisc *child;
234 child = qdisc_create_dflt(qdisc_dev(sch),
235 sch->dev_queue,
236 &pfifo_qdisc_ops,
237 TC_H_MAKE(sch->handle,
238 i + 1));
239 if (child) {
240 sch_tree_lock(sch);
241 child = xchg(&q->queues[i], child);
242
243 if (child != &noop_qdisc) {
244 qdisc_tree_decrease_qlen(child,
245 child->q.qlen);
246 qdisc_destroy(child);
247 }
248 sch_tree_unlock(sch);
249 }
250 }
251 }
252 return 0;
253}
254
255static int multiq_init(struct Qdisc *sch, struct nlattr *opt)
256{
257 struct multiq_sched_data *q = qdisc_priv(sch);
258 int i, err;
259
260 q->queues = NULL;
261
262 if (opt == NULL)
263 return -EINVAL;
264
265 q->max_bands = qdisc_dev(sch)->num_tx_queues;
266
267 q->queues = kcalloc(q->max_bands, sizeof(struct Qdisc *), GFP_KERNEL);
268 if (!q->queues)
269 return -ENOBUFS;
270 for (i = 0; i < q->max_bands; i++)
271 q->queues[i] = &noop_qdisc;
272
273 err = multiq_tune(sch,opt);
274
275 if (err)
276 kfree(q->queues);
277
278 return err;
279}
280
281static int multiq_dump(struct Qdisc *sch, struct sk_buff *skb)
282{
283 struct multiq_sched_data *q = qdisc_priv(sch);
284 unsigned char *b = skb_tail_pointer(skb);
285 struct tc_multiq_qopt opt;
286
287 opt.bands = q->bands;
288 opt.max_bands = q->max_bands;
289
290 NLA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt);
291
292 return skb->len;
293
294nla_put_failure:
295 nlmsg_trim(skb, b);
296 return -1;
297}
298
299static int multiq_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new,
300 struct Qdisc **old)
301{
302 struct multiq_sched_data *q = qdisc_priv(sch);
303 unsigned long band = arg - 1;
304
305 if (band >= q->bands)
306 return -EINVAL;
307
308 if (new == NULL)
309 new = &noop_qdisc;
310
311 sch_tree_lock(sch);
312 *old = q->queues[band];
313 q->queues[band] = new;
314 qdisc_tree_decrease_qlen(*old, (*old)->q.qlen);
315 qdisc_reset(*old);
316 sch_tree_unlock(sch);
317
318 return 0;
319}
320
321static struct Qdisc *
322multiq_leaf(struct Qdisc *sch, unsigned long arg)
323{
324 struct multiq_sched_data *q = qdisc_priv(sch);
325 unsigned long band = arg - 1;
326
327 if (band >= q->bands)
328 return NULL;
329
330 return q->queues[band];
331}
332
333static unsigned long multiq_get(struct Qdisc *sch, u32 classid)
334{
335 struct multiq_sched_data *q = qdisc_priv(sch);
336 unsigned long band = TC_H_MIN(classid);
337
338 if (band - 1 >= q->bands)
339 return 0;
340 return band;
341}
342
343static unsigned long multiq_bind(struct Qdisc *sch, unsigned long parent,
344 u32 classid)
345{
346 return multiq_get(sch, classid);
347}
348
349
350static void multiq_put(struct Qdisc *q, unsigned long cl)
351{
352 return;
353}
354
355static int multiq_change(struct Qdisc *sch, u32 handle, u32 parent,
356 struct nlattr **tca, unsigned long *arg)
357{
358 unsigned long cl = *arg;
359 struct multiq_sched_data *q = qdisc_priv(sch);
360
361 if (cl - 1 > q->bands)
362 return -ENOENT;
363 return 0;
364}
365
366static int multiq_delete(struct Qdisc *sch, unsigned long cl)
367{
368 struct multiq_sched_data *q = qdisc_priv(sch);
369 if (cl - 1 > q->bands)
370 return -ENOENT;
371 return 0;
372}
373
374
375static int multiq_dump_class(struct Qdisc *sch, unsigned long cl,
376 struct sk_buff *skb, struct tcmsg *tcm)
377{
378 struct multiq_sched_data *q = qdisc_priv(sch);
379
380 if (cl - 1 > q->bands)
381 return -ENOENT;
382 tcm->tcm_handle |= TC_H_MIN(cl);
383 if (q->queues[cl-1])
384 tcm->tcm_info = q->queues[cl-1]->handle;
385 return 0;
386}
387
388static int multiq_dump_class_stats(struct Qdisc *sch, unsigned long cl,
389 struct gnet_dump *d)
390{
391 struct multiq_sched_data *q = qdisc_priv(sch);
392 struct Qdisc *cl_q;
393
394 cl_q = q->queues[cl - 1];
395 if (gnet_stats_copy_basic(d, &cl_q->bstats) < 0 ||
396 gnet_stats_copy_queue(d, &cl_q->qstats) < 0)
397 return -1;
398
399 return 0;
400}
401
402static void multiq_walk(struct Qdisc *sch, struct qdisc_walker *arg)
403{
404 struct multiq_sched_data *q = qdisc_priv(sch);
405 int band;
406
407 if (arg->stop)
408 return;
409
410 for (band = 0; band < q->bands; band++) {
411 if (arg->count < arg->skip) {
412 arg->count++;
413 continue;
414 }
415 if (arg->fn(sch, band+1, arg) < 0) {
416 arg->stop = 1;
417 break;
418 }
419 arg->count++;
420 }
421}
422
423static struct tcf_proto **multiq_find_tcf(struct Qdisc *sch, unsigned long cl)
424{
425 struct multiq_sched_data *q = qdisc_priv(sch);
426
427 if (cl)
428 return NULL;
429 return &q->filter_list;
430}
431
432static const struct Qdisc_class_ops multiq_class_ops = {
433 .graft = multiq_graft,
434 .leaf = multiq_leaf,
435 .get = multiq_get,
436 .put = multiq_put,
437 .change = multiq_change,
438 .delete = multiq_delete,
439 .walk = multiq_walk,
440 .tcf_chain = multiq_find_tcf,
441 .bind_tcf = multiq_bind,
442 .unbind_tcf = multiq_put,
443 .dump = multiq_dump_class,
444 .dump_stats = multiq_dump_class_stats,
445};
446
447static struct Qdisc_ops multiq_qdisc_ops __read_mostly = {
448 .next = NULL,
449 .cl_ops = &multiq_class_ops,
450 .id = "multiq",
451 .priv_size = sizeof(struct multiq_sched_data),
452 .enqueue = multiq_enqueue,
453 .dequeue = multiq_dequeue,
454 .requeue = multiq_requeue,
455 .drop = multiq_drop,
456 .init = multiq_init,
457 .reset = multiq_reset,
458 .destroy = multiq_destroy,
459 .change = multiq_tune,
460 .dump = multiq_dump,
461 .owner = THIS_MODULE,
462};
463
464static int __init multiq_module_init(void)
465{
466 return register_qdisc(&multiq_qdisc_ops);
467}
468
469static void __exit multiq_module_exit(void)
470{
471 unregister_qdisc(&multiq_qdisc_ops);
472}
473
474module_init(multiq_module_init)
475module_exit(multiq_module_exit)
476
477MODULE_LICENSE("GPL");
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