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/* $OpenBSD: altq_red.h,v 1.6 2011/07/04 01:07:43 henning Exp $ */
/* $KAME: altq_red.h,v 1.5 2000/12/14 08:12:46 thorpej Exp $ */
/*
* Copyright (C) 1997-2002
* Sony Computer Science Laboratories Inc. All rights reserved.
*
* 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.
* 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.
*
* THIS SOFTWARE IS PROVIDED BY SONY CSL 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 SONY CSL 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_RED_H_
#define _ALTQ_ALTQ_RED_H_
#include <altq/altq_classq.h>
/* red flags */
#define REDF_ECN4 0x01 /* use packet marking for IPv4 packets */
#define REDF_ECN6 0x02 /* use packet marking for IPv6 packets */
#define REDF_ECN (REDF_ECN4 | REDF_ECN6)
/*
* simpler versions of red parameters and statistics used by other
* disciplines (e.g., CBQ)
*/
struct redparams {
int th_min; /* red min threshold */
int th_max; /* red max threshold */
int inv_pmax; /* inverse of max drop probability */
};
struct redstats {
int q_avg;
struct pktcntr xmit_cnt;
struct pktcntr drop_cnt;
u_int drop_forced;
u_int drop_unforced;
u_int marked_packets;
};
#ifdef _KERNEL
/* weight table structure for idle time calibration */
struct wtab {
struct wtab *w_next;
int w_weight;
int w_param_max;
int w_refcount;
int32_t w_tab[32];
};
typedef struct red {
int red_pkttime; /* average packet time in micro sec
used for idle calibration */
int red_flags; /* red flags */
/* red parameters */
int red_weight; /* weight for EWMA */
int red_inv_pmax; /* inverse of max drop probability */
int red_thmin; /* red min threshold */
int red_thmax; /* red max threshold */
/* variables for internal use */
int red_wshift; /* log(red_weight) */
int red_thmin_s; /* th_min scaled by avgshift */
int red_thmax_s; /* th_max scaled by avgshift */
int red_probd; /* drop probability denominator */
int red_avg; /* queue len avg scaled by avgshift */
int red_count; /* packet count since last dropped/
marked packet */
int red_idle; /* queue was empty */
int red_old; /* avg is above th_min */
struct wtab *red_wtab; /* weight table */
struct timeval red_last; /* time when the queue becomes idle */
struct {
struct pktcntr xmit_cnt;
struct pktcntr drop_cnt;
u_int drop_forced;
u_int drop_unforced;
u_int marked_packets;
} red_stats;
} red_t;
/* red drop types */
#define DTYPE_NODROP 0 /* no drop */
#define DTYPE_FORCED 1 /* a "forced" drop */
#define DTYPE_EARLY 2 /* an "unforced" (early) drop */
extern red_t *red_alloc(int, int, int, int, int, int);
extern void red_destroy(red_t *);
extern void red_getstats(red_t *, struct redstats *);
extern int red_addq(red_t *, class_queue_t *, struct mbuf *,
struct altq_pktattr *);
extern struct mbuf *red_getq(red_t *, class_queue_t *);
extern int drop_early(int, int, int);
extern int mark_ecn(struct mbuf *, struct altq_pktattr *, int);
extern struct wtab *wtab_alloc(int);
extern int wtab_destroy(struct wtab *);
extern int32_t pow_w(struct wtab *, int);
#endif /* _KERNEL */
#endif /* _ALTQ_ALTQ_RED_H_ */
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