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1 | #ifndef __NET_SCHED_CODEL_QDISC_H | |
2 | #define __NET_SCHED_CODEL_QDISC_H | |
3 | ||
4 | /* | |
5 | * Codel - The Controlled-Delay Active Queue Management algorithm | |
6 | * | |
7 | * Copyright (C) 2011-2012 Kathleen Nichols <nichols@pollere.com> | |
8 | * Copyright (C) 2011-2012 Van Jacobson <van@pollere.net> | |
9 | * Copyright (C) 2012 Michael D. Taht <dave.taht@bufferbloat.net> | |
10 | * Copyright (C) 2012,2015 Eric Dumazet <edumazet@google.com> | |
11 | * | |
12 | * Redistribution and use in source and binary forms, with or without | |
13 | * modification, are permitted provided that the following conditions | |
14 | * are met: | |
15 | * 1. Redistributions of source code must retain the above copyright | |
16 | * notice, this list of conditions, and the following disclaimer, | |
17 | * without modification. | |
18 | * 2. Redistributions in binary form must reproduce the above copyright | |
19 | * notice, this list of conditions and the following disclaimer in the | |
20 | * documentation and/or other materials provided with the distribution. | |
21 | * 3. The names of the authors may not be used to endorse or promote products | |
22 | * derived from this software without specific prior written permission. | |
23 | * | |
24 | * Alternatively, provided that this notice is retained in full, this | |
25 | * software may be distributed under the terms of the GNU General | |
26 | * Public License ("GPL") version 2, in which case the provisions of the | |
27 | * GPL apply INSTEAD OF those given above. | |
28 | * | |
29 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
30 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
31 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
32 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
33 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
34 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
35 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
36 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
37 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
38 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
39 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH | |
40 | * DAMAGE. | |
41 | * | |
42 | */ | |
43 | ||
44 | /* Controlling Queue Delay (CoDel) algorithm | |
45 | * ========================================= | |
46 | * Source : Kathleen Nichols and Van Jacobson | |
47 | * http://queue.acm.org/detail.cfm?id=2209336 | |
48 | * | |
49 | * Implemented on linux by Dave Taht and Eric Dumazet | |
50 | */ | |
51 | ||
52 | /* Qdiscs using codel plugin must use codel_skb_cb in their own cb[] */ | |
53 | struct codel_skb_cb { | |
54 | codel_time_t enqueue_time; | |
55 | unsigned int mem_usage; | |
56 | }; | |
57 | ||
58 | static struct codel_skb_cb *get_codel_cb(const struct sk_buff *skb) | |
59 | { | |
60 | qdisc_cb_private_validate(skb, sizeof(struct codel_skb_cb)); | |
61 | return (struct codel_skb_cb *)qdisc_skb_cb(skb)->data; | |
62 | } | |
63 | ||
64 | static codel_time_t codel_get_enqueue_time(const struct sk_buff *skb) | |
65 | { | |
66 | return get_codel_cb(skb)->enqueue_time; | |
67 | } | |
68 | ||
69 | static void codel_set_enqueue_time(struct sk_buff *skb) | |
70 | { | |
71 | get_codel_cb(skb)->enqueue_time = codel_get_time(); | |
72 | } | |
73 | ||
74 | #endif |