/*
* CoDel - The Controlled-Delay Active Queue Management algorithm
*
* Copyright (C) 2013 Ermal Luçi <eri@FreeBSD.org>
* 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 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.
*/
#ifndef _ALTQ_ALTQ_CODEL_H_
#define _ALTQ_ALTQ_CODEL_H_
struct codel_stats {
u_int32_t maxpacket;
struct pktcntr drop_cnt;
u_int marked_packets;
};
struct codel_ifstats {
u_int qlength;
u_int qlimit;
struct codel_stats stats;
struct pktcntr cl_xmitcnt; /* transmitted packet counter */
struct pktcntr cl_dropcnt; /* dropped packet counter */
};
/*
* CBQ_STATS_VERSION is defined in altq.h to work around issues stemming
* from mixing of public-API and internal bits in each scheduler-specific
* header.
*/
#ifdef _KERNEL
#include <net/altq/altq_classq.h>
/**
* struct codel_params - contains codel parameters
* <at> target: target queue size (in time units)
* <at> interval: width of moving time window
* <at> ecn: is Explicit Congestion Notification enabled
*/
struct codel_params {
u_int64_t target;
u_int64_t interval;
int ecn;
};
/**
* struct codel_vars - contains codel variables
* <at> count: how many drops we've done since the last time we
* entered dropping state
* <at> lastcount: count at entry to dropping state
* <at> dropping: set to true if in dropping state
* <at> rec_inv_sqrt: reciprocal value of sqrt(count) >> 1
* <at> first_above_time: when we went (or will go) continuously above
* target for interval
* <at> drop_next: time to drop next packet, or when we dropped last
* <at> ldelay: sojourn time of last dequeued packet
*/
struct codel_vars {
u_int32_t count;
u_int32_t lastcount;
int dropping;
u_int16_t rec_inv_sqrt;
u_int64_t first_above_time;
u_int64_t drop_next;
u_int64_t ldelay;
};
struct codel {
int last_pps;
struct codel_params params;
struct codel_vars vars;
struct codel_stats stats;
struct timeval last_log;
u_int32_t drop_overlimit;
};
/*
* codel interface state
*/
struct codel_if {
struct codel_if *cif_next; /* interface state list */
struct ifaltq *cif_ifq; /* backpointer to ifaltq */
u_int cif_bandwidth; /* link bandwidth in bps */
class_queue_t *cl_q; /* class queue structure */
struct codel codel;
/* statistics */
struct codel_ifstats cl_stats;
};
struct codel *codel_alloc(int, int, int);
void codel_destroy(struct codel *);
int codel_addq(struct codel *, class_queue_t *, struct mbuf *);
struct mbuf *codel_getq(struct codel *, class_queue_t *);
void codel_getstats(struct codel *, struct codel_stats *);
#endif /* _KERNEL */
#endif /* _ALTQ_ALTQ_CODEL_H_ */
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