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-rw-r--r--net/sched/Kconfig11
-rw-r--r--net/sched/Makefile1
-rw-r--r--net/sched/sch_drr.c505
3 files changed, 517 insertions, 0 deletions
diff --git a/net/sched/Kconfig b/net/sched/Kconfig
index 36543b6fcef3..4f7ef0db302b 100644
--- a/net/sched/Kconfig
+++ b/net/sched/Kconfig
@@ -194,6 +194,17 @@ config NET_SCH_NETEM
194 194
195 If unsure, say N. 195 If unsure, say N.
196 196
197config NET_SCH_DRR
198 tristate "Deficit Round Robin scheduler (DRR)"
199 help
200 Say Y here if you want to use the Deficit Round Robin (DRR) packet
201 scheduling algorithm.
202
203 To compile this driver as a module, choose M here: the module
204 will be called sch_drr.
205
206 If unsure, say N.
207
197config NET_SCH_INGRESS 208config NET_SCH_INGRESS
198 tristate "Ingress Qdisc" 209 tristate "Ingress Qdisc"
199 depends on NET_CLS_ACT 210 depends on NET_CLS_ACT
diff --git a/net/sched/Makefile b/net/sched/Makefile
index 70b35f8708c3..54d950cd4b8d 100644
--- a/net/sched/Makefile
+++ b/net/sched/Makefile
@@ -30,6 +30,7 @@ obj-$(CONFIG_NET_SCH_PRIO) += sch_prio.o
30obj-$(CONFIG_NET_SCH_MULTIQ) += sch_multiq.o 30obj-$(CONFIG_NET_SCH_MULTIQ) += sch_multiq.o
31obj-$(CONFIG_NET_SCH_ATM) += sch_atm.o 31obj-$(CONFIG_NET_SCH_ATM) += sch_atm.o
32obj-$(CONFIG_NET_SCH_NETEM) += sch_netem.o 32obj-$(CONFIG_NET_SCH_NETEM) += sch_netem.o
33obj-$(CONFIG_NET_SCH_DRR) += sch_drr.o
33obj-$(CONFIG_NET_CLS_U32) += cls_u32.o 34obj-$(CONFIG_NET_CLS_U32) += cls_u32.o
34obj-$(CONFIG_NET_CLS_ROUTE4) += cls_route.o 35obj-$(CONFIG_NET_CLS_ROUTE4) += cls_route.o
35obj-$(CONFIG_NET_CLS_FW) += cls_fw.o 36obj-$(CONFIG_NET_CLS_FW) += cls_fw.o
diff --git a/net/sched/sch_drr.c b/net/sched/sch_drr.c
new file mode 100644
index 000000000000..e71a5de23e23
--- /dev/null
+++ b/net/sched/sch_drr.c
@@ -0,0 +1,505 @@
1/*
2 * net/sched/sch_drr.c Deficit Round Robin scheduler
3 *
4 * Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * version 2 as published by the Free Software Foundation.
9 */
10
11#include <linux/module.h>
12#include <linux/init.h>
13#include <linux/errno.h>
14#include <linux/netdevice.h>
15#include <linux/pkt_sched.h>
16#include <net/sch_generic.h>
17#include <net/pkt_sched.h>
18#include <net/pkt_cls.h>
19
20struct drr_class {
21 struct Qdisc_class_common common;
22 unsigned int refcnt;
23 unsigned int filter_cnt;
24
25 struct gnet_stats_basic bstats;
26 struct gnet_stats_queue qstats;
27 struct gnet_stats_rate_est rate_est;
28 struct list_head alist;
29 struct Qdisc *qdisc;
30
31 u32 quantum;
32 u32 deficit;
33};
34
35struct drr_sched {
36 struct list_head active;
37 struct tcf_proto *filter_list;
38 struct Qdisc_class_hash clhash;
39};
40
41static struct drr_class *drr_find_class(struct Qdisc *sch, u32 classid)
42{
43 struct drr_sched *q = qdisc_priv(sch);
44 struct Qdisc_class_common *clc;
45
46 clc = qdisc_class_find(&q->clhash, classid);
47 if (clc == NULL)
48 return NULL;
49 return container_of(clc, struct drr_class, common);
50}
51
52static void drr_purge_queue(struct drr_class *cl)
53{
54 unsigned int len = cl->qdisc->q.qlen;
55
56 qdisc_reset(cl->qdisc);
57 qdisc_tree_decrease_qlen(cl->qdisc, len);
58}
59
60static const struct nla_policy drr_policy[TCA_DRR_MAX + 1] = {
61 [TCA_DRR_QUANTUM] = { .type = NLA_U32 },
62};
63
64static int drr_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
65 struct nlattr **tca, unsigned long *arg)
66{
67 struct drr_sched *q = qdisc_priv(sch);
68 struct drr_class *cl = (struct drr_class *)*arg;
69 struct nlattr *tb[TCA_DRR_MAX + 1];
70 u32 quantum;
71 int err;
72
73 err = nla_parse_nested(tb, TCA_DRR_MAX, tca[TCA_OPTIONS], drr_policy);
74 if (err < 0)
75 return err;
76
77 if (tb[TCA_DRR_QUANTUM]) {
78 quantum = nla_get_u32(tb[TCA_DRR_QUANTUM]);
79 if (quantum == 0)
80 return -EINVAL;
81 } else
82 quantum = psched_mtu(qdisc_dev(sch));
83
84 if (cl != NULL) {
85 sch_tree_lock(sch);
86 if (tb[TCA_DRR_QUANTUM])
87 cl->quantum = quantum;
88 sch_tree_unlock(sch);
89
90 if (tca[TCA_RATE])
91 gen_replace_estimator(&cl->bstats, &cl->rate_est,
92 qdisc_root_sleeping_lock(sch),
93 tca[TCA_RATE]);
94 return 0;
95 }
96
97 cl = kzalloc(sizeof(struct drr_class), GFP_KERNEL);
98 if (cl == NULL)
99 return -ENOBUFS;
100
101 cl->refcnt = 1;
102 cl->common.classid = classid;
103 cl->quantum = quantum;
104 cl->qdisc = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue,
105 &pfifo_qdisc_ops, classid);
106 if (cl->qdisc == NULL)
107 cl->qdisc = &noop_qdisc;
108
109 if (tca[TCA_RATE])
110 gen_replace_estimator(&cl->bstats, &cl->rate_est,
111 qdisc_root_sleeping_lock(sch),
112 tca[TCA_RATE]);
113
114 sch_tree_lock(sch);
115 qdisc_class_hash_insert(&q->clhash, &cl->common);
116 sch_tree_unlock(sch);
117
118 qdisc_class_hash_grow(sch, &q->clhash);
119
120 *arg = (unsigned long)cl;
121 return 0;
122}
123
124static void drr_destroy_class(struct Qdisc *sch, struct drr_class *cl)
125{
126 gen_kill_estimator(&cl->bstats, &cl->rate_est);
127 qdisc_destroy(cl->qdisc);
128 kfree(cl);
129}
130
131static int drr_delete_class(struct Qdisc *sch, unsigned long arg)
132{
133 struct drr_sched *q = qdisc_priv(sch);
134 struct drr_class *cl = (struct drr_class *)arg;
135
136 if (cl->filter_cnt > 0)
137 return -EBUSY;
138
139 sch_tree_lock(sch);
140
141 drr_purge_queue(cl);
142 qdisc_class_hash_remove(&q->clhash, &cl->common);
143
144 if (--cl->refcnt == 0)
145 drr_destroy_class(sch, cl);
146
147 sch_tree_unlock(sch);
148 return 0;
149}
150
151static unsigned long drr_get_class(struct Qdisc *sch, u32 classid)
152{
153 struct drr_class *cl = drr_find_class(sch, classid);
154
155 if (cl != NULL)
156 cl->refcnt++;
157
158 return (unsigned long)cl;
159}
160
161static void drr_put_class(struct Qdisc *sch, unsigned long arg)
162{
163 struct drr_class *cl = (struct drr_class *)arg;
164
165 if (--cl->refcnt == 0)
166 drr_destroy_class(sch, cl);
167}
168
169static struct tcf_proto **drr_tcf_chain(struct Qdisc *sch, unsigned long cl)
170{
171 struct drr_sched *q = qdisc_priv(sch);
172
173 if (cl)
174 return NULL;
175
176 return &q->filter_list;
177}
178
179static unsigned long drr_bind_tcf(struct Qdisc *sch, unsigned long parent,
180 u32 classid)
181{
182 struct drr_class *cl = drr_find_class(sch, classid);
183
184 if (cl != NULL)
185 cl->filter_cnt++;
186
187 return (unsigned long)cl;
188}
189
190static void drr_unbind_tcf(struct Qdisc *sch, unsigned long arg)
191{
192 struct drr_class *cl = (struct drr_class *)arg;
193
194 cl->filter_cnt--;
195}
196
197static int drr_graft_class(struct Qdisc *sch, unsigned long arg,
198 struct Qdisc *new, struct Qdisc **old)
199{
200 struct drr_class *cl = (struct drr_class *)arg;
201
202 if (new == NULL) {
203 new = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue,
204 &pfifo_qdisc_ops, cl->common.classid);
205 if (new == NULL)
206 new = &noop_qdisc;
207 }
208
209 sch_tree_lock(sch);
210 drr_purge_queue(cl);
211 *old = xchg(&cl->qdisc, new);
212 sch_tree_unlock(sch);
213 return 0;
214}
215
216static struct Qdisc *drr_class_leaf(struct Qdisc *sch, unsigned long arg)
217{
218 struct drr_class *cl = (struct drr_class *)arg;
219
220 return cl->qdisc;
221}
222
223static void drr_qlen_notify(struct Qdisc *csh, unsigned long arg)
224{
225 struct drr_class *cl = (struct drr_class *)arg;
226
227 if (cl->qdisc->q.qlen == 0)
228 list_del(&cl->alist);
229}
230
231static int drr_dump_class(struct Qdisc *sch, unsigned long arg,
232 struct sk_buff *skb, struct tcmsg *tcm)
233{
234 struct drr_class *cl = (struct drr_class *)arg;
235 struct nlattr *nest;
236
237 tcm->tcm_parent = TC_H_ROOT;
238 tcm->tcm_handle = cl->common.classid;
239 tcm->tcm_info = cl->qdisc->handle;
240
241 nest = nla_nest_start(skb, TCA_OPTIONS);
242 if (nest == NULL)
243 goto nla_put_failure;
244 NLA_PUT_U32(skb, TCA_DRR_QUANTUM, cl->quantum);
245 return nla_nest_end(skb, nest);
246
247nla_put_failure:
248 nla_nest_cancel(skb, nest);
249 return -EMSGSIZE;
250}
251
252static int drr_dump_class_stats(struct Qdisc *sch, unsigned long arg,
253 struct gnet_dump *d)
254{
255 struct drr_class *cl = (struct drr_class *)arg;
256 struct tc_drr_stats xstats;
257
258 memset(&xstats, 0, sizeof(xstats));
259 if (cl->qdisc->q.qlen)
260 xstats.deficit = cl->deficit;
261
262 if (gnet_stats_copy_basic(d, &cl->bstats) < 0 ||
263 gnet_stats_copy_rate_est(d, &cl->rate_est) < 0 ||
264 gnet_stats_copy_queue(d, &cl->qdisc->qstats) < 0)
265 return -1;
266
267 return gnet_stats_copy_app(d, &xstats, sizeof(xstats));
268}
269
270static void drr_walk(struct Qdisc *sch, struct qdisc_walker *arg)
271{
272 struct drr_sched *q = qdisc_priv(sch);
273 struct drr_class *cl;
274 struct hlist_node *n;
275 unsigned int i;
276
277 if (arg->stop)
278 return;
279
280 for (i = 0; i < q->clhash.hashsize; i++) {
281 hlist_for_each_entry(cl, n, &q->clhash.hash[i], common.hnode) {
282 if (arg->count < arg->skip) {
283 arg->count++;
284 continue;
285 }
286 if (arg->fn(sch, (unsigned long)cl, arg) < 0) {
287 arg->stop = 1;
288 return;
289 }
290 arg->count++;
291 }
292 }
293}
294
295static struct drr_class *drr_classify(struct sk_buff *skb, struct Qdisc *sch,
296 int *qerr)
297{
298 struct drr_sched *q = qdisc_priv(sch);
299 struct drr_class *cl;
300 struct tcf_result res;
301 int result;
302
303 if (TC_H_MAJ(skb->priority ^ sch->handle) == 0) {
304 cl = drr_find_class(sch, skb->priority);
305 if (cl != NULL)
306 return cl;
307 }
308
309 *qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
310 result = tc_classify(skb, q->filter_list, &res);
311 if (result >= 0) {
312#ifdef CONFIG_NET_CLS_ACT
313 switch (result) {
314 case TC_ACT_QUEUED:
315 case TC_ACT_STOLEN:
316 *qerr = NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
317 case TC_ACT_SHOT:
318 return NULL;
319 }
320#endif
321 cl = (struct drr_class *)res.class;
322 if (cl == NULL)
323 cl = drr_find_class(sch, res.classid);
324 return cl;
325 }
326 return NULL;
327}
328
329static int drr_enqueue(struct sk_buff *skb, struct Qdisc *sch)
330{
331 struct drr_sched *q = qdisc_priv(sch);
332 struct drr_class *cl;
333 unsigned int len;
334 int err;
335
336 cl = drr_classify(skb, sch, &err);
337 if (cl == NULL) {
338 if (err & __NET_XMIT_BYPASS)
339 sch->qstats.drops++;
340 kfree_skb(skb);
341 return err;
342 }
343
344 len = qdisc_pkt_len(skb);
345 err = qdisc_enqueue(skb, cl->qdisc);
346 if (unlikely(err != NET_XMIT_SUCCESS)) {
347 if (net_xmit_drop_count(err)) {
348 cl->qstats.drops++;
349 sch->qstats.drops++;
350 }
351 return err;
352 }
353
354 if (cl->qdisc->q.qlen == 1) {
355 list_add_tail(&cl->alist, &q->active);
356 cl->deficit = cl->quantum;
357 }
358
359 cl->bstats.packets++;
360 cl->bstats.bytes += len;
361 sch->bstats.packets++;
362 sch->bstats.bytes += len;
363
364 sch->q.qlen++;
365 return err;
366}
367
368static struct sk_buff *drr_dequeue(struct Qdisc *sch)
369{
370 struct drr_sched *q = qdisc_priv(sch);
371 struct drr_class *cl;
372 struct sk_buff *skb;
373 unsigned int len;
374
375 while (!list_empty(&q->active)) {
376 cl = list_first_entry(&q->active, struct drr_class, alist);
377 skb = cl->qdisc->ops->peek(cl->qdisc);
378 if (skb == NULL)
379 goto skip;
380
381 len = qdisc_pkt_len(skb);
382 if (len <= cl->deficit) {
383 cl->deficit -= len;
384 skb = qdisc_dequeue_peeked(cl->qdisc);
385 if (cl->qdisc->q.qlen == 0)
386 list_del(&cl->alist);
387 sch->q.qlen--;
388 return skb;
389 }
390
391 cl->deficit += cl->quantum;
392skip:
393 list_move_tail(&cl->alist, &q->active);
394 }
395 return NULL;
396}
397
398static unsigned int drr_drop(struct Qdisc *sch)
399{
400 struct drr_sched *q = qdisc_priv(sch);
401 struct drr_class *cl;
402 unsigned int len;
403
404 list_for_each_entry(cl, &q->active, alist) {
405 if (cl->qdisc->ops->drop) {
406 len = cl->qdisc->ops->drop(cl->qdisc);
407 if (len > 0) {
408 if (cl->qdisc->q.qlen == 0)
409 list_del(&cl->alist);
410 return len;
411 }
412 }
413 }
414 return 0;
415}
416
417static int drr_init_qdisc(struct Qdisc *sch, struct nlattr *opt)
418{
419 struct drr_sched *q = qdisc_priv(sch);
420 int err;
421
422 err = qdisc_class_hash_init(&q->clhash);
423 if (err < 0)
424 return err;
425 INIT_LIST_HEAD(&q->active);
426 return 0;
427}
428
429static void drr_reset_qdisc(struct Qdisc *sch)
430{
431 struct drr_sched *q = qdisc_priv(sch);
432 struct drr_class *cl;
433 struct hlist_node *n;
434 unsigned int i;
435
436 for (i = 0; i < q->clhash.hashsize; i++) {
437 hlist_for_each_entry(cl, n, &q->clhash.hash[i], common.hnode) {
438 if (cl->qdisc->q.qlen)
439 list_del(&cl->alist);
440 qdisc_reset(cl->qdisc);
441 }
442 }
443 sch->q.qlen = 0;
444}
445
446static void drr_destroy_qdisc(struct Qdisc *sch)
447{
448 struct drr_sched *q = qdisc_priv(sch);
449 struct drr_class *cl;
450 struct hlist_node *n, *next;
451 unsigned int i;
452
453 tcf_destroy_chain(&q->filter_list);
454
455 for (i = 0; i < q->clhash.hashsize; i++) {
456 hlist_for_each_entry_safe(cl, n, next, &q->clhash.hash[i],
457 common.hnode)
458 drr_destroy_class(sch, cl);
459 }
460 qdisc_class_hash_destroy(&q->clhash);
461}
462
463static const struct Qdisc_class_ops drr_class_ops = {
464 .change = drr_change_class,
465 .delete = drr_delete_class,
466 .get = drr_get_class,
467 .put = drr_put_class,
468 .tcf_chain = drr_tcf_chain,
469 .bind_tcf = drr_bind_tcf,
470 .unbind_tcf = drr_unbind_tcf,
471 .graft = drr_graft_class,
472 .leaf = drr_class_leaf,
473 .qlen_notify = drr_qlen_notify,
474 .dump = drr_dump_class,
475 .dump_stats = drr_dump_class_stats,
476 .walk = drr_walk,
477};
478
479static struct Qdisc_ops drr_qdisc_ops __read_mostly = {
480 .cl_ops = &drr_class_ops,
481 .id = "drr",
482 .priv_size = sizeof(struct drr_sched),
483 .enqueue = drr_enqueue,
484 .dequeue = drr_dequeue,
485 .peek = qdisc_peek_dequeued,
486 .drop = drr_drop,
487 .init = drr_init_qdisc,
488 .reset = drr_reset_qdisc,
489 .destroy = drr_destroy_qdisc,
490 .owner = THIS_MODULE,
491};
492
493static int __init drr_init(void)
494{
495 return register_qdisc(&drr_qdisc_ops);
496}
497
498static void __exit drr_exit(void)
499{
500 unregister_qdisc(&drr_qdisc_ops);
501}
502
503module_init(drr_init);
504module_exit(drr_exit);
505MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-15 07:56:02 -0500