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 36 /* red flags */ 37 #define REDF_ECN4 0x01 /* use packet marking for IPv4 packets */ 38 #define REDF_ECN6 0x02 /* use packet marking for IPv6 packets */ 39 #define REDF_ECN (REDF_ECN4 | REDF_ECN6) 40 #define REDF_FLOWVALVE 0x04 /* use flowvalve (aka penalty-box) */ 41 42 /* 43 * simpler versions of red parameters and statistics used by other 44 * disciplines (e.g., CBQ) 45 */ 46 struct redparams { 47 int th_min; /* red min threshold */ 48 int th_max; /* red max threshold */ 49 int inv_pmax; /* inverse of max drop probability */ 50 }; 51 52 struct redstats { 53 int q_avg; 54 struct pktcntr xmit_cnt; 55 struct pktcntr drop_cnt; 56 u_int drop_forced; 57 u_int drop_unforced; 58 u_int marked_packets; 59 }; 60 61 62 #ifdef _KERNEL 63 64 65 /* weight table structure for idle time calibration */ 66 struct wtab { 67 struct wtab *w_next; 68 int w_weight; 69 int w_param_max; 70 int w_refcount; 71 int32_t w_tab[32]; 72 }; 73 74 typedef struct red { 75 int red_pkttime; /* average packet time in micro sec 76 used for idle calibration */ 77 int red_flags; /* red flags */ 78 79 /* red parameters */ 80 int red_weight; /* weight for EWMA */ 81 int red_inv_pmax; /* inverse of max drop probability */ 82 int red_thmin; /* red min threshold */ 83 int red_thmax; /* red max threshold */ 84 85 /* variables for internal use */ 86 int red_wshift; /* log(red_weight) */ 87 int red_thmin_s; /* th_min scaled by avgshift */ 88 int red_thmax_s; /* th_max scaled by avgshift */ 89 int red_probd; /* drop probability denominator */ 90 91 int red_avg; /* queue len avg scaled by avgshift */ 92 int red_count; /* packet count since last dropped/ 93 marked packet */ 94 int red_idle; /* queue was empty */ 95 int red_old; /* avg is above th_min */ 96 struct wtab *red_wtab; /* weight table */ 97 struct timeval red_last; /* time when the queue becomes idle */ 98 99 100 struct { 101 struct pktcntr xmit_cnt; 102 struct pktcntr drop_cnt; 103 u_int drop_forced; 104 u_int drop_unforced; 105 u_int marked_packets; 106 } red_stats; 107 } red_t; 108 109 110 /* red drop types */ 111 #define DTYPE_NODROP 0 /* no drop */ 112 #define DTYPE_FORCED 1 /* a "forced" drop */ 113 #define DTYPE_EARLY 2 /* an "unforced" (early) drop */ 114 115 extern red_t *red_alloc(int, int, int, int, int, int); 116 extern void red_destroy(red_t *); 117 extern void red_getstats(red_t *, struct redstats *); 118 extern int red_addq(red_t *, class_queue_t *, struct mbuf *, 119 struct altq_pktattr *); 120 extern struct mbuf *red_getq(red_t *, class_queue_t *); 121 extern int drop_early(int, int, int); 122 extern int mark_ecn(struct mbuf *, struct altq_pktattr *, int); 123 extern struct wtab *wtab_alloc(int); 124 extern int wtab_destroy(struct wtab *); 125 extern int32_t pow_w(struct wtab *, int); 126 127 #endif /* _KERNEL */ 128 129 #endif /* _ALTQ_ALTQ_RED_H_ */ 130