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1/*
2 * net/sched/sch_red.c Random Early Detection queue.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
10 *
11 * Changes:
12 * J Hadi Salim 980914: computation fixes
13 * Alexey Makarenko <makar@phoenix.kharkov.ua> 990814: qave on idle link was calculated incorrectly.
14 * J Hadi Salim 980816: ECN support
15 */
16
17#include <linux/module.h>
18#include <linux/types.h>
19#include <linux/kernel.h>
20#include <linux/skbuff.h>
21#include <net/pkt_sched.h>
22#include <net/inet_ecn.h>
23#include <net/red.h>
24
25
26/* Parameters, settable by user:
27 -----------------------------
28
29 limit - bytes (must be > qth_max + burst)
30
31 Hard limit on queue length, should be chosen >qth_max
32 to allow packet bursts. This parameter does not
33 affect the algorithms behaviour and can be chosen
34 arbitrarily high (well, less than ram size)
35 Really, this limit will never be reached
36 if RED works correctly.
37 */
38
39struct red_sched_data {
40 u32 limit; /* HARD maximal queue length */
41 unsigned char flags;
42 struct timer_list adapt_timer;
43 struct red_parms parms;
44 struct red_vars vars;
45 struct red_stats stats;
46 struct Qdisc *qdisc;
47};
48
49static inline int red_use_ecn(struct red_sched_data *q)
50{
51 return q->flags & TC_RED_ECN;
52}
53
54static inline int red_use_harddrop(struct red_sched_data *q)
55{
56 return q->flags & TC_RED_HARDDROP;
57}
58
59static int red_enqueue(struct sk_buff *skb, struct Qdisc *sch)
60{
61 struct red_sched_data *q = qdisc_priv(sch);
62 struct Qdisc *child = q->qdisc;
63 int ret;
64
65 q->vars.qavg = red_calc_qavg(&q->parms,
66 &q->vars,
67 child->qstats.backlog);
68
69 if (red_is_idling(&q->vars))
70 red_end_of_idle_period(&q->vars);
71
72 switch (red_action(&q->parms, &q->vars, q->vars.qavg)) {
73 case RED_DONT_MARK:
74 break;
75
76 case RED_PROB_MARK:
77 sch->qstats.overlimits++;
78 if (!red_use_ecn(q) || !INET_ECN_set_ce(skb)) {
79 q->stats.prob_drop++;
80 goto congestion_drop;
81 }
82
83 q->stats.prob_mark++;
84 break;
85
86 case RED_HARD_MARK:
87 sch->qstats.overlimits++;
88 if (red_use_harddrop(q) || !red_use_ecn(q) ||
89 !INET_ECN_set_ce(skb)) {
90 q->stats.forced_drop++;
91 goto congestion_drop;
92 }
93
94 q->stats.forced_mark++;
95 break;
96 }
97
98 ret = qdisc_enqueue(skb, child);
99 if (likely(ret == NET_XMIT_SUCCESS)) {
100 sch->q.qlen++;
101 } else if (net_xmit_drop_count(ret)) {
102 q->stats.pdrop++;
103 sch->qstats.drops++;
104 }
105 return ret;
106
107congestion_drop:
108 qdisc_drop(skb, sch);
109 return NET_XMIT_CN;
110}
111
112static struct sk_buff *red_dequeue(struct Qdisc *sch)
113{
114 struct sk_buff *skb;
115 struct red_sched_data *q = qdisc_priv(sch);
116 struct Qdisc *child = q->qdisc;
117
118 skb = child->dequeue(child);
119 if (skb) {
120 qdisc_bstats_update(sch, skb);
121 sch->q.qlen--;
122 } else {
123 if (!red_is_idling(&q->vars))
124 red_start_of_idle_period(&q->vars);
125 }
126 return skb;
127}
128
129static struct sk_buff *red_peek(struct Qdisc *sch)
130{
131 struct red_sched_data *q = qdisc_priv(sch);
132 struct Qdisc *child = q->qdisc;
133
134 return child->ops->peek(child);
135}
136
137static unsigned int red_drop(struct Qdisc *sch)
138{
139 struct red_sched_data *q = qdisc_priv(sch);
140 struct Qdisc *child = q->qdisc;
141 unsigned int len;
142
143 if (child->ops->drop && (len = child->ops->drop(child)) > 0) {
144 q->stats.other++;
145 sch->qstats.drops++;
146 sch->q.qlen--;
147 return len;
148 }
149
150 if (!red_is_idling(&q->vars))
151 red_start_of_idle_period(&q->vars);
152
153 return 0;
154}
155
156static void red_reset(struct Qdisc *sch)
157{
158 struct red_sched_data *q = qdisc_priv(sch);
159
160 qdisc_reset(q->qdisc);
161 sch->q.qlen = 0;
162 red_restart(&q->vars);
163}
164
165static void red_destroy(struct Qdisc *sch)
166{
167 struct red_sched_data *q = qdisc_priv(sch);
168
169 del_timer_sync(&q->adapt_timer);
170 qdisc_destroy(q->qdisc);
171}
172
173static const struct nla_policy red_policy[TCA_RED_MAX + 1] = {
174 [TCA_RED_PARMS] = { .len = sizeof(struct tc_red_qopt) },
175 [TCA_RED_STAB] = { .len = RED_STAB_SIZE },
176 [TCA_RED_MAX_P] = { .type = NLA_U32 },
177};
178
179static int red_change(struct Qdisc *sch, struct nlattr *opt)
180{
181 struct red_sched_data *q = qdisc_priv(sch);
182 struct nlattr *tb[TCA_RED_MAX + 1];
183 struct tc_red_qopt *ctl;
184 struct Qdisc *child = NULL;
185 int err;
186 u32 max_P;
187
188 if (opt == NULL)
189 return -EINVAL;
190
191 err = nla_parse_nested(tb, TCA_RED_MAX, opt, red_policy);
192 if (err < 0)
193 return err;
194
195 if (tb[TCA_RED_PARMS] == NULL ||
196 tb[TCA_RED_STAB] == NULL)
197 return -EINVAL;
198
199 max_P = tb[TCA_RED_MAX_P] ? nla_get_u32(tb[TCA_RED_MAX_P]) : 0;
200
201 ctl = nla_data(tb[TCA_RED_PARMS]);
202
203 if (ctl->limit > 0) {
204 child = fifo_create_dflt(sch, &bfifo_qdisc_ops, ctl->limit);
205 if (IS_ERR(child))
206 return PTR_ERR(child);
207 }
208
209 sch_tree_lock(sch);
210 q->flags = ctl->flags;
211 q->limit = ctl->limit;
212 if (child) {
213 qdisc_tree_decrease_qlen(q->qdisc, q->qdisc->q.qlen);
214 qdisc_destroy(q->qdisc);
215 q->qdisc = child;
216 }
217
218 red_set_parms(&q->parms,
219 ctl->qth_min, ctl->qth_max, ctl->Wlog,
220 ctl->Plog, ctl->Scell_log,
221 nla_data(tb[TCA_RED_STAB]),
222 max_P);
223 red_set_vars(&q->vars);
224
225 del_timer(&q->adapt_timer);
226 if (ctl->flags & TC_RED_ADAPTATIVE)
227 mod_timer(&q->adapt_timer, jiffies + HZ/2);
228
229 if (!q->qdisc->q.qlen)
230 red_start_of_idle_period(&q->vars);
231
232 sch_tree_unlock(sch);
233 return 0;
234}
235
236static inline void red_adaptative_timer(unsigned long arg)
237{
238 struct Qdisc *sch = (struct Qdisc *)arg;
239 struct red_sched_data *q = qdisc_priv(sch);
240 spinlock_t *root_lock = qdisc_lock(qdisc_root_sleeping(sch));
241
242 spin_lock(root_lock);
243 red_adaptative_algo(&q->parms, &q->vars);
244 mod_timer(&q->adapt_timer, jiffies + HZ/2);
245 spin_unlock(root_lock);
246}
247
248static int red_init(struct Qdisc *sch, struct nlattr *opt)
249{
250 struct red_sched_data *q = qdisc_priv(sch);
251
252 q->qdisc = &noop_qdisc;
253 setup_timer(&q->adapt_timer, red_adaptative_timer, (unsigned long)sch);
254 return red_change(sch, opt);
255}
256
257static int red_dump(struct Qdisc *sch, struct sk_buff *skb)
258{
259 struct red_sched_data *q = qdisc_priv(sch);
260 struct nlattr *opts = NULL;
261 struct tc_red_qopt opt = {
262 .limit = q->limit,
263 .flags = q->flags,
264 .qth_min = q->parms.qth_min >> q->parms.Wlog,
265 .qth_max = q->parms.qth_max >> q->parms.Wlog,
266 .Wlog = q->parms.Wlog,
267 .Plog = q->parms.Plog,
268 .Scell_log = q->parms.Scell_log,
269 };
270
271 sch->qstats.backlog = q->qdisc->qstats.backlog;
272 opts = nla_nest_start(skb, TCA_OPTIONS);
273 if (opts == NULL)
274 goto nla_put_failure;
275 if (nla_put(skb, TCA_RED_PARMS, sizeof(opt), &opt) ||
276 nla_put_u32(skb, TCA_RED_MAX_P, q->parms.max_P))
277 goto nla_put_failure;
278 return nla_nest_end(skb, opts);
279
280nla_put_failure:
281 nla_nest_cancel(skb, opts);
282 return -EMSGSIZE;
283}
284
285static int red_dump_stats(struct Qdisc *sch, struct gnet_dump *d)
286{
287 struct red_sched_data *q = qdisc_priv(sch);
288 struct tc_red_xstats st = {
289 .early = q->stats.prob_drop + q->stats.forced_drop,
290 .pdrop = q->stats.pdrop,
291 .other = q->stats.other,
292 .marked = q->stats.prob_mark + q->stats.forced_mark,
293 };
294
295 return gnet_stats_copy_app(d, &st, sizeof(st));
296}
297
298static int red_dump_class(struct Qdisc *sch, unsigned long cl,
299 struct sk_buff *skb, struct tcmsg *tcm)
300{
301 struct red_sched_data *q = qdisc_priv(sch);
302
303 tcm->tcm_handle |= TC_H_MIN(1);
304 tcm->tcm_info = q->qdisc->handle;
305 return 0;
306}
307
308static int red_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new,
309 struct Qdisc **old)
310{
311 struct red_sched_data *q = qdisc_priv(sch);
312
313 if (new == NULL)
314 new = &noop_qdisc;
315
316 sch_tree_lock(sch);
317 *old = q->qdisc;
318 q->qdisc = new;
319 qdisc_tree_decrease_qlen(*old, (*old)->q.qlen);
320 qdisc_reset(*old);
321 sch_tree_unlock(sch);
322 return 0;
323}
324
325static struct Qdisc *red_leaf(struct Qdisc *sch, unsigned long arg)
326{
327 struct red_sched_data *q = qdisc_priv(sch);
328 return q->qdisc;
329}
330
331static unsigned long red_get(struct Qdisc *sch, u32 classid)
332{
333 return 1;
334}
335
336static void red_put(struct Qdisc *sch, unsigned long arg)
337{
338}
339
340static void red_walk(struct Qdisc *sch, struct qdisc_walker *walker)
341{
342 if (!walker->stop) {
343 if (walker->count >= walker->skip)
344 if (walker->fn(sch, 1, walker) < 0) {
345 walker->stop = 1;
346 return;
347 }
348 walker->count++;
349 }
350}
351
352static const struct Qdisc_class_ops red_class_ops = {
353 .graft = red_graft,
354 .leaf = red_leaf,
355 .get = red_get,
356 .put = red_put,
357 .walk = red_walk,
358 .dump = red_dump_class,
359};
360
361static struct Qdisc_ops red_qdisc_ops __read_mostly = {
362 .id = "red",
363 .priv_size = sizeof(struct red_sched_data),
364 .cl_ops = &red_class_ops,
365 .enqueue = red_enqueue,
366 .dequeue = red_dequeue,
367 .peek = red_peek,
368 .drop = red_drop,
369 .init = red_init,
370 .reset = red_reset,
371 .destroy = red_destroy,
372 .change = red_change,
373 .dump = red_dump,
374 .dump_stats = red_dump_stats,
375 .owner = THIS_MODULE,
376};
377
378static int __init red_module_init(void)
379{
380 return register_qdisc(&red_qdisc_ops);
381}
382
383static void __exit red_module_exit(void)
384{
385 unregister_qdisc(&red_qdisc_ops);
386}
387
388module_init(red_module_init)
389module_exit(red_module_exit)
390
391MODULE_LICENSE("GPL");
1/*
2 * net/sched/sch_red.c Random Early Detection queue.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
10 *
11 * Changes:
12 * J Hadi Salim 980914: computation fixes
13 * Alexey Makarenko <makar@phoenix.kharkov.ua> 990814: qave on idle link was calculated incorrectly.
14 * J Hadi Salim 980816: ECN support
15 */
16
17#include <linux/module.h>
18#include <linux/types.h>
19#include <linux/kernel.h>
20#include <linux/skbuff.h>
21#include <net/pkt_sched.h>
22#include <net/inet_ecn.h>
23#include <net/red.h>
24
25
26/* Parameters, settable by user:
27 -----------------------------
28
29 limit - bytes (must be > qth_max + burst)
30
31 Hard limit on queue length, should be chosen >qth_max
32 to allow packet bursts. This parameter does not
33 affect the algorithms behaviour and can be chosen
34 arbitrarily high (well, less than ram size)
35 Really, this limit will never be reached
36 if RED works correctly.
37 */
38
39struct red_sched_data {
40 u32 limit; /* HARD maximal queue length */
41 unsigned char flags;
42 struct timer_list adapt_timer;
43 struct red_parms parms;
44 struct red_vars vars;
45 struct red_stats stats;
46 struct Qdisc *qdisc;
47};
48
49static inline int red_use_ecn(struct red_sched_data *q)
50{
51 return q->flags & TC_RED_ECN;
52}
53
54static inline int red_use_harddrop(struct red_sched_data *q)
55{
56 return q->flags & TC_RED_HARDDROP;
57}
58
59static int red_enqueue(struct sk_buff *skb, struct Qdisc *sch,
60 struct sk_buff **to_free)
61{
62 struct red_sched_data *q = qdisc_priv(sch);
63 struct Qdisc *child = q->qdisc;
64 int ret;
65
66 q->vars.qavg = red_calc_qavg(&q->parms,
67 &q->vars,
68 child->qstats.backlog);
69
70 if (red_is_idling(&q->vars))
71 red_end_of_idle_period(&q->vars);
72
73 switch (red_action(&q->parms, &q->vars, q->vars.qavg)) {
74 case RED_DONT_MARK:
75 break;
76
77 case RED_PROB_MARK:
78 qdisc_qstats_overlimit(sch);
79 if (!red_use_ecn(q) || !INET_ECN_set_ce(skb)) {
80 q->stats.prob_drop++;
81 goto congestion_drop;
82 }
83
84 q->stats.prob_mark++;
85 break;
86
87 case RED_HARD_MARK:
88 qdisc_qstats_overlimit(sch);
89 if (red_use_harddrop(q) || !red_use_ecn(q) ||
90 !INET_ECN_set_ce(skb)) {
91 q->stats.forced_drop++;
92 goto congestion_drop;
93 }
94
95 q->stats.forced_mark++;
96 break;
97 }
98
99 ret = qdisc_enqueue(skb, child, to_free);
100 if (likely(ret == NET_XMIT_SUCCESS)) {
101 qdisc_qstats_backlog_inc(sch, skb);
102 sch->q.qlen++;
103 } else if (net_xmit_drop_count(ret)) {
104 q->stats.pdrop++;
105 qdisc_qstats_drop(sch);
106 }
107 return ret;
108
109congestion_drop:
110 qdisc_drop(skb, sch, to_free);
111 return NET_XMIT_CN;
112}
113
114static struct sk_buff *red_dequeue(struct Qdisc *sch)
115{
116 struct sk_buff *skb;
117 struct red_sched_data *q = qdisc_priv(sch);
118 struct Qdisc *child = q->qdisc;
119
120 skb = child->dequeue(child);
121 if (skb) {
122 qdisc_bstats_update(sch, skb);
123 qdisc_qstats_backlog_dec(sch, skb);
124 sch->q.qlen--;
125 } else {
126 if (!red_is_idling(&q->vars))
127 red_start_of_idle_period(&q->vars);
128 }
129 return skb;
130}
131
132static struct sk_buff *red_peek(struct Qdisc *sch)
133{
134 struct red_sched_data *q = qdisc_priv(sch);
135 struct Qdisc *child = q->qdisc;
136
137 return child->ops->peek(child);
138}
139
140static void red_reset(struct Qdisc *sch)
141{
142 struct red_sched_data *q = qdisc_priv(sch);
143
144 qdisc_reset(q->qdisc);
145 sch->qstats.backlog = 0;
146 sch->q.qlen = 0;
147 red_restart(&q->vars);
148}
149
150static void red_destroy(struct Qdisc *sch)
151{
152 struct red_sched_data *q = qdisc_priv(sch);
153
154 del_timer_sync(&q->adapt_timer);
155 qdisc_destroy(q->qdisc);
156}
157
158static const struct nla_policy red_policy[TCA_RED_MAX + 1] = {
159 [TCA_RED_PARMS] = { .len = sizeof(struct tc_red_qopt) },
160 [TCA_RED_STAB] = { .len = RED_STAB_SIZE },
161 [TCA_RED_MAX_P] = { .type = NLA_U32 },
162};
163
164static int red_change(struct Qdisc *sch, struct nlattr *opt)
165{
166 struct red_sched_data *q = qdisc_priv(sch);
167 struct nlattr *tb[TCA_RED_MAX + 1];
168 struct tc_red_qopt *ctl;
169 struct Qdisc *child = NULL;
170 int err;
171 u32 max_P;
172
173 if (opt == NULL)
174 return -EINVAL;
175
176 err = nla_parse_nested(tb, TCA_RED_MAX, opt, red_policy);
177 if (err < 0)
178 return err;
179
180 if (tb[TCA_RED_PARMS] == NULL ||
181 tb[TCA_RED_STAB] == NULL)
182 return -EINVAL;
183
184 max_P = tb[TCA_RED_MAX_P] ? nla_get_u32(tb[TCA_RED_MAX_P]) : 0;
185
186 ctl = nla_data(tb[TCA_RED_PARMS]);
187
188 if (ctl->limit > 0) {
189 child = fifo_create_dflt(sch, &bfifo_qdisc_ops, ctl->limit);
190 if (IS_ERR(child))
191 return PTR_ERR(child);
192 }
193
194 sch_tree_lock(sch);
195 q->flags = ctl->flags;
196 q->limit = ctl->limit;
197 if (child) {
198 qdisc_tree_reduce_backlog(q->qdisc, q->qdisc->q.qlen,
199 q->qdisc->qstats.backlog);
200 qdisc_destroy(q->qdisc);
201 q->qdisc = child;
202 }
203
204 red_set_parms(&q->parms,
205 ctl->qth_min, ctl->qth_max, ctl->Wlog,
206 ctl->Plog, ctl->Scell_log,
207 nla_data(tb[TCA_RED_STAB]),
208 max_P);
209 red_set_vars(&q->vars);
210
211 del_timer(&q->adapt_timer);
212 if (ctl->flags & TC_RED_ADAPTATIVE)
213 mod_timer(&q->adapt_timer, jiffies + HZ/2);
214
215 if (!q->qdisc->q.qlen)
216 red_start_of_idle_period(&q->vars);
217
218 sch_tree_unlock(sch);
219 return 0;
220}
221
222static inline void red_adaptative_timer(unsigned long arg)
223{
224 struct Qdisc *sch = (struct Qdisc *)arg;
225 struct red_sched_data *q = qdisc_priv(sch);
226 spinlock_t *root_lock = qdisc_lock(qdisc_root_sleeping(sch));
227
228 spin_lock(root_lock);
229 red_adaptative_algo(&q->parms, &q->vars);
230 mod_timer(&q->adapt_timer, jiffies + HZ/2);
231 spin_unlock(root_lock);
232}
233
234static int red_init(struct Qdisc *sch, struct nlattr *opt)
235{
236 struct red_sched_data *q = qdisc_priv(sch);
237
238 q->qdisc = &noop_qdisc;
239 setup_timer(&q->adapt_timer, red_adaptative_timer, (unsigned long)sch);
240 return red_change(sch, opt);
241}
242
243static int red_dump(struct Qdisc *sch, struct sk_buff *skb)
244{
245 struct red_sched_data *q = qdisc_priv(sch);
246 struct nlattr *opts = NULL;
247 struct tc_red_qopt opt = {
248 .limit = q->limit,
249 .flags = q->flags,
250 .qth_min = q->parms.qth_min >> q->parms.Wlog,
251 .qth_max = q->parms.qth_max >> q->parms.Wlog,
252 .Wlog = q->parms.Wlog,
253 .Plog = q->parms.Plog,
254 .Scell_log = q->parms.Scell_log,
255 };
256
257 sch->qstats.backlog = q->qdisc->qstats.backlog;
258 opts = nla_nest_start(skb, TCA_OPTIONS);
259 if (opts == NULL)
260 goto nla_put_failure;
261 if (nla_put(skb, TCA_RED_PARMS, sizeof(opt), &opt) ||
262 nla_put_u32(skb, TCA_RED_MAX_P, q->parms.max_P))
263 goto nla_put_failure;
264 return nla_nest_end(skb, opts);
265
266nla_put_failure:
267 nla_nest_cancel(skb, opts);
268 return -EMSGSIZE;
269}
270
271static int red_dump_stats(struct Qdisc *sch, struct gnet_dump *d)
272{
273 struct red_sched_data *q = qdisc_priv(sch);
274 struct tc_red_xstats st = {
275 .early = q->stats.prob_drop + q->stats.forced_drop,
276 .pdrop = q->stats.pdrop,
277 .other = q->stats.other,
278 .marked = q->stats.prob_mark + q->stats.forced_mark,
279 };
280
281 return gnet_stats_copy_app(d, &st, sizeof(st));
282}
283
284static int red_dump_class(struct Qdisc *sch, unsigned long cl,
285 struct sk_buff *skb, struct tcmsg *tcm)
286{
287 struct red_sched_data *q = qdisc_priv(sch);
288
289 tcm->tcm_handle |= TC_H_MIN(1);
290 tcm->tcm_info = q->qdisc->handle;
291 return 0;
292}
293
294static int red_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new,
295 struct Qdisc **old)
296{
297 struct red_sched_data *q = qdisc_priv(sch);
298
299 if (new == NULL)
300 new = &noop_qdisc;
301
302 *old = qdisc_replace(sch, new, &q->qdisc);
303 return 0;
304}
305
306static struct Qdisc *red_leaf(struct Qdisc *sch, unsigned long arg)
307{
308 struct red_sched_data *q = qdisc_priv(sch);
309 return q->qdisc;
310}
311
312static unsigned long red_get(struct Qdisc *sch, u32 classid)
313{
314 return 1;
315}
316
317static void red_put(struct Qdisc *sch, unsigned long arg)
318{
319}
320
321static void red_walk(struct Qdisc *sch, struct qdisc_walker *walker)
322{
323 if (!walker->stop) {
324 if (walker->count >= walker->skip)
325 if (walker->fn(sch, 1, walker) < 0) {
326 walker->stop = 1;
327 return;
328 }
329 walker->count++;
330 }
331}
332
333static const struct Qdisc_class_ops red_class_ops = {
334 .graft = red_graft,
335 .leaf = red_leaf,
336 .get = red_get,
337 .put = red_put,
338 .walk = red_walk,
339 .dump = red_dump_class,
340};
341
342static struct Qdisc_ops red_qdisc_ops __read_mostly = {
343 .id = "red",
344 .priv_size = sizeof(struct red_sched_data),
345 .cl_ops = &red_class_ops,
346 .enqueue = red_enqueue,
347 .dequeue = red_dequeue,
348 .peek = red_peek,
349 .init = red_init,
350 .reset = red_reset,
351 .destroy = red_destroy,
352 .change = red_change,
353 .dump = red_dump,
354 .dump_stats = red_dump_stats,
355 .owner = THIS_MODULE,
356};
357
358static int __init red_module_init(void)
359{
360 return register_qdisc(&red_qdisc_ops);
361}
362
363static void __exit red_module_exit(void)
364{
365 unregister_qdisc(&red_qdisc_ops);
366}
367
368module_init(red_module_init)
369module_exit(red_module_exit)
370
371MODULE_LICENSE("GPL");