130 lines
4.3 KiB
C
130 lines
4.3 KiB
C
/*
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* CoDel - The Controlled-Delay Active Queue Management algorithm
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*
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* Copyright (C) 2013 Ermal Luçi <eri@FreeBSD.org>
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* Copyright (C) 2011-2012 Kathleen Nichols <nichols@pollere.com>
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* Copyright (C) 2011-2012 Van Jacobson <van@pollere.net>
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* Copyright (C) 2012 Michael D. Taht <dave.taht@bufferbloat.net>
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* Copyright (C) 2012 Eric Dumazet <edumazet@google.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The names of the authors may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* Alternatively, provided that this notice is retained in full, this
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* software may be distributed under the terms of the GNU General
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* Public License ("GPL") version 2, in which case the provisions of the
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* GPL apply INSTEAD OF those given above.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _ALTQ_ALTQ_CODEL_H_
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#define _ALTQ_ALTQ_CODEL_H_
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struct codel_stats {
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u_int32_t maxpacket;
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struct pktcntr drop_cnt;
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u_int marked_packets;
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};
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struct codel_ifstats {
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u_int qlength;
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u_int qlimit;
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struct codel_stats stats;
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struct pktcntr cl_xmitcnt; /* transmitted packet counter */
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struct pktcntr cl_dropcnt; /* dropped packet counter */
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};
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#ifdef _KERNEL
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#include <net/altq/altq_classq.h>
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/**
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* struct codel_params - contains codel parameters
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* <at> target: target queue size (in time units)
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* <at> interval: width of moving time window
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* <at> ecn: is Explicit Congestion Notification enabled
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*/
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struct codel_params {
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u_int64_t target;
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u_int64_t interval;
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int ecn;
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};
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/**
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* struct codel_vars - contains codel variables
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* <at> count: how many drops we've done since the last time we
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* entered dropping state
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* <at> lastcount: count at entry to dropping state
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* <at> dropping: set to true if in dropping state
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* <at> rec_inv_sqrt: reciprocal value of sqrt(count) >> 1
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* <at> first_above_time: when we went (or will go) continuously above
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* target for interval
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* <at> drop_next: time to drop next packet, or when we dropped last
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* <at> ldelay: sojourn time of last dequeued packet
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*/
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struct codel_vars {
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u_int32_t count;
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u_int32_t lastcount;
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int dropping;
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u_int16_t rec_inv_sqrt;
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u_int64_t first_above_time;
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u_int64_t drop_next;
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u_int64_t ldelay;
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};
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struct codel {
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int last_pps;
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struct codel_params params;
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struct codel_vars vars;
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struct codel_stats stats;
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struct timeval last_log;
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u_int32_t drop_overlimit;
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};
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/*
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* codel interface state
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*/
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struct codel_if {
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struct codel_if *cif_next; /* interface state list */
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struct ifaltq *cif_ifq; /* backpointer to ifaltq */
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u_int cif_bandwidth; /* link bandwidth in bps */
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class_queue_t *cl_q; /* class queue structure */
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struct codel codel;
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/* statistics */
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struct codel_ifstats cl_stats;
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};
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struct codel *codel_alloc(int, int, int);
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void codel_destroy(struct codel *);
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int codel_addq(struct codel *, class_queue_t *, struct mbuf *);
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struct mbuf *codel_getq(struct codel *, class_queue_t *);
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void codel_getstats(struct codel *, struct codel_stats *);
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#endif /* _KERNEL */
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#endif /* _ALTQ_ALTQ_CODEL_H_ */
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