| 1 | #ifndef __NET_SCHED_CODEL_QDISC_H
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| 2 | #define __NET_SCHED_CODEL_QDISC_H
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| 3 |
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| 4 | |
| 5 | * Codel - The Controlled-Delay Active Queue Management algorithm
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| 6 | *
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| 7 | * Copyright (C) 2011-2012 Kathleen Nichols <[email protected]>
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| 8 | * Copyright (C) 2011-2012 Van Jacobson <[email protected]>
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| 9 | * Copyright (C) 2012 Michael D. Taht <[email protected]>
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| 10 | * Copyright (C) 2012,2015 Eric Dumazet <[email protected]>
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| 11 | *
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| 12 | * Redistribution and use in source and binary forms, with or without
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| 13 | * modification, are permitted provided that the following conditions
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| 14 | * are met:
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| 15 | * 1. Redistributions of source code must retain the above copyright
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| 16 | * notice, this list of conditions, and the following disclaimer,
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| 17 | * without modification.
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| 18 | * 2. Redistributions in binary form must reproduce the above copyright
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| 19 | * notice, this list of conditions and the following disclaimer in the
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| 20 | * documentation and/or other materials provided with the distribution.
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| 21 | * 3. The names of the authors may not be used to endorse or promote products
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| 22 | * derived from this software without specific prior written permission.
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| 23 | *
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| 24 | * Alternatively, provided that this notice is retained in full, this
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| 25 | * software may be distributed under the terms of the GNU General
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| 26 | * Public License ("GPL") version 2, in which case the provisions of the
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| 27 | * GPL apply INSTEAD OF those given above.
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| 28 | *
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| 29 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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| 30 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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| 31 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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| 32 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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| 33 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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| 34 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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| 35 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 36 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 37 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 38 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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| 39 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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| 40 | * DAMAGE.
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| 41 | *
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| 42 |
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| 43 |
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| 44 | |
| 45 | * =========================================
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| 46 | * Source : Kathleen Nichols and Van Jacobson
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| 47 | * http://queue.acm.org/detail.cfm?id=2209336
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| 48 | *
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| 49 | * Implemented on linux by Dave Taht and Eric Dumazet
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| 50 |
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| 51 |
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| 52 | #include <net/codel.h>
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| 53 | #include <net/pkt_sched.h>
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| 54 |
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| 55 |
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| 56 | struct codel_skb_cb {
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| 57 | codel_time_t enqueue_time;
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| 58 | unsigned int mem_usage;
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| 59 | };
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| 60 |
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| 61 | static struct codel_skb_cb *get_codel_cb(const struct sk_buff *skb)
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| 62 | {
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| 63 | qdisc_cb_private_validate(skb, sizeof(struct codel_skb_cb));
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| 64 | return (struct codel_skb_cb *)qdisc_skb_cb(skb)->data;
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| 65 | }
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| 66 |
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| 67 | static codel_time_t codel_get_enqueue_time(const struct sk_buff *skb)
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| 68 | {
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| 69 | return get_codel_cb(skb)->enqueue_time;
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| 70 | }
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| 71 |
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| 72 | static void codel_set_enqueue_time(struct sk_buff *skb)
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| 73 | {
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| 74 | get_codel_cb(skb)->enqueue_time = codel_get_time();
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| 75 | }
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| 76 |
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| 77 | #endif
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