| #ifndef __NET_SCHED_CODEL_QDISC_H |
| #define __NET_SCHED_CODEL_QDISC_H |
| |
| /* |
| * Codel - The Controlled-Delay Active Queue Management algorithm |
| * |
| * Copyright (C) 2011-2012 Kathleen Nichols <nichols@pollere.com> |
| * Copyright (C) 2011-2012 Van Jacobson <van@pollere.net> |
| * Copyright (C) 2012 Michael D. Taht <dave.taht@bufferbloat.net> |
| * Copyright (C) 2012,2015 Eric Dumazet <edumazet@google.com> |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions, and the following disclaimer, |
| * without modification. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. The names of the authors may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * Alternatively, provided that this notice is retained in full, this |
| * software may be distributed under the terms of the GNU General |
| * Public License ("GPL") version 2, in which case the provisions of the |
| * GPL apply INSTEAD OF those given above. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH |
| * DAMAGE. |
| * |
| */ |
| |
| /* Controlling Queue Delay (CoDel) algorithm |
| * ========================================= |
| * Source : Kathleen Nichols and Van Jacobson |
| * http://queue.acm.org/detail.cfm?id=2209336 |
| * |
| * Implemented on linux by Dave Taht and Eric Dumazet |
| */ |
| |
| /* Qdiscs using codel plugin must use codel_skb_cb in their own cb[] */ |
| struct codel_skb_cb { |
| codel_time_t enqueue_time; |
| unsigned int mem_usage; |
| }; |
| |
| static struct codel_skb_cb *get_codel_cb(const struct sk_buff *skb) |
| { |
| qdisc_cb_private_validate(skb, sizeof(struct codel_skb_cb)); |
| return (struct codel_skb_cb *)qdisc_skb_cb(skb)->data; |
| } |
| |
| static codel_time_t codel_get_enqueue_time(const struct sk_buff *skb) |
| { |
| return get_codel_cb(skb)->enqueue_time; |
| } |
| |
| static void codel_set_enqueue_time(struct sk_buff *skb) |
| { |
| get_codel_cb(skb)->enqueue_time = codel_get_time(); |
| } |
| |
| #endif |