#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
*/
#include <net/codel.h>
#include <net/pkt_sched.h>
/* 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
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