125 lines
4.1 KiB
C
125 lines
4.1 KiB
C
/*-
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* Copyright (C) 1997-2003
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* Sony Computer Science Laboratories Inc. All rights reserved.
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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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* 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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*
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* THIS SOFTWARE IS PROVIDED BY SONY CSL AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL SONY CSL OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $KAME: altq_red.h,v 1.8 2003/07/10 12:07:49 kjc Exp $
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* $FreeBSD$
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*/
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#ifndef _ALTQ_ALTQ_RED_H_
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#define _ALTQ_ALTQ_RED_H_
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#include <net/altq/altq_classq.h>
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/* red flags */
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#define REDF_ECN4 0x01 /* use packet marking for IPv4 packets */
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#define REDF_ECN6 0x02 /* use packet marking for IPv6 packets */
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#define REDF_ECN (REDF_ECN4 | REDF_ECN6)
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#define REDF_FLOWVALVE 0x04 /* use flowvalve (aka penalty-box) */
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/*
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* simpler versions of red parameters and statistics used by other
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* disciplines (e.g., CBQ)
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*/
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struct redparams {
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int th_min; /* red min threshold */
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int th_max; /* red max threshold */
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int inv_pmax; /* inverse of max drop probability */
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};
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struct redstats {
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int q_avg;
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struct pktcntr xmit_cnt;
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struct pktcntr drop_cnt;
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u_int drop_forced;
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u_int drop_unforced;
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u_int marked_packets;
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};
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#ifdef _KERNEL
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/* weight table structure for idle time calibration */
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struct wtab {
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struct wtab *w_next;
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int w_weight;
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int w_param_max;
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int w_refcount;
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int32_t w_tab[32];
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};
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typedef struct red {
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int red_pkttime; /* average packet time in micro sec
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used for idle calibration */
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int red_flags; /* red flags */
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/* red parameters */
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int red_weight; /* weight for EWMA */
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int red_inv_pmax; /* inverse of max drop probability */
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int red_thmin; /* red min threshold */
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int red_thmax; /* red max threshold */
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/* variables for internal use */
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int red_wshift; /* log(red_weight) */
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int red_thmin_s; /* th_min scaled by avgshift */
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int red_thmax_s; /* th_max scaled by avgshift */
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int red_probd; /* drop probability denominator */
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int red_avg; /* queue len avg scaled by avgshift */
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int red_count; /* packet count since last dropped/
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marked packet */
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int red_idle; /* queue was empty */
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int red_old; /* avg is above th_min */
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struct wtab *red_wtab; /* weight table */
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struct timeval red_last; /* time when the queue becomes idle */
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struct {
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struct pktcntr xmit_cnt;
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struct pktcntr drop_cnt;
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u_int drop_forced;
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u_int drop_unforced;
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u_int marked_packets;
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} red_stats;
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} red_t;
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/* red drop types */
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#define DTYPE_NODROP 0 /* no drop */
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#define DTYPE_FORCED 1 /* a "forced" drop */
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#define DTYPE_EARLY 2 /* an "unforced" (early) drop */
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extern red_t *red_alloc(int, int, int, int, int, int);
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extern void red_destroy(red_t *);
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extern void red_getstats(red_t *, struct redstats *);
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extern int red_addq(red_t *, class_queue_t *, struct mbuf *,
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struct altq_pktattr *);
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extern struct mbuf *red_getq(red_t *, class_queue_t *);
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extern int drop_early(int, int, int);
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extern int mark_ecn(struct mbuf *, struct altq_pktattr *, int);
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extern struct wtab *wtab_alloc(int);
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extern int wtab_destroy(struct wtab *);
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extern int32_t pow_w(struct wtab *, int);
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#endif /* _KERNEL */
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#endif /* _ALTQ_ALTQ_RED_H_ */
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