1/*- 2 * Copyright (C) 1997-2003 3 * Sony Computer Science Laboratories Inc. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY SONY CSL AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL SONY CSL OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $KAME: altq_red.h,v 1.8 2003/07/10 12:07:49 kjc Exp $ 27 * $FreeBSD$ 28 */ 29 30#ifndef _ALTQ_ALTQ_RED_H_ 31#define _ALTQ_ALTQ_RED_H_ 32 33#include <net/altq/altq_classq.h> 34 35/* red flags */ 36#define REDF_ECN4 0x01 /* use packet marking for IPv4 packets */ 37#define REDF_ECN6 0x02 /* use packet marking for IPv6 packets */ 38#define REDF_ECN (REDF_ECN4 | REDF_ECN6) 39#define REDF_FLOWVALVE 0x04 /* use flowvalve (aka penalty-box) */ 40 41/* 42 * simpler versions of red parameters and statistics used by other 43 * disciplines (e.g., CBQ) 44 */ 45struct redparams { 46 int th_min; /* red min threshold */ 47 int th_max; /* red max threshold */ 48 int inv_pmax; /* inverse of max drop probability */ 49}; 50 51struct redstats { 52 int q_avg; 53 struct pktcntr xmit_cnt; 54 struct pktcntr drop_cnt; 55 u_int drop_forced; 56 u_int drop_unforced; 57 u_int marked_packets; 58}; 59 60#ifdef _KERNEL 61 62/* weight table structure for idle time calibration */ 63struct wtab { 64 struct wtab *w_next; 65 int w_weight; 66 int w_param_max; 67 int w_refcount; 68 int32_t w_tab[32]; 69}; 70 71typedef struct red { 72 int red_pkttime; /* average packet time in micro sec 73 used for idle calibration */ 74 int red_flags; /* red flags */ 75 76 /* red parameters */ 77 int red_weight; /* weight for EWMA */ 78 int red_inv_pmax; /* inverse of max drop probability */ 79 int red_thmin; /* red min threshold */ 80 int red_thmax; /* red max threshold */ 81 82 /* variables for internal use */ 83 int red_wshift; /* log(red_weight) */ 84 int red_thmin_s; /* th_min scaled by avgshift */ 85 int red_thmax_s; /* th_max scaled by avgshift */ 86 int red_probd; /* drop probability denominator */ 87 88 int red_avg; /* queue len avg scaled by avgshift */ 89 int red_count; /* packet count since last dropped/ 90 marked packet */ 91 int red_idle; /* queue was empty */ 92 int red_old; /* avg is above th_min */ 93 struct wtab *red_wtab; /* weight table */ 94 struct timeval red_last; /* time when the queue becomes idle */ 95 96 struct { 97 struct pktcntr xmit_cnt; 98 struct pktcntr drop_cnt; 99 u_int drop_forced; 100 u_int drop_unforced; 101 u_int marked_packets; 102 } red_stats; 103} red_t; 104 105/* red drop types */ 106#define DTYPE_NODROP 0 /* no drop */ 107#define DTYPE_FORCED 1 /* a "forced" drop */ 108#define DTYPE_EARLY 2 /* an "unforced" (early) drop */ 109 110extern red_t *red_alloc(int, int, int, int, int, int); 111extern void red_destroy(red_t *); 112extern void red_getstats(red_t *, struct redstats *); 113extern int red_addq(red_t *, class_queue_t *, struct mbuf *, 114 struct altq_pktattr *); 115extern struct mbuf *red_getq(red_t *, class_queue_t *); 116extern int drop_early(int, int, int); 117extern int mark_ecn(struct mbuf *, struct altq_pktattr *, int); 118extern struct wtab *wtab_alloc(int); 119extern int wtab_destroy(struct wtab *); 120extern int32_t pow_w(struct wtab *, int); 121 122#endif /* _KERNEL */ 123 124#endif /* _ALTQ_ALTQ_RED_H_ */ 125