1 /* $OpenBSD: altq_red.h,v 1.5 2002/12/16 17:27:20 henning Exp $ */ 2 /* $KAME: altq_red.h,v 1.5 2000/12/14 08:12:46 thorpej Exp $ */ 3 4 /* 5 * Copyright (C) 1997-2002 6 * Sony Computer Science Laboratories Inc. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY SONY CSL AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL SONY CSL OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #ifndef _ALTQ_ALTQ_RED_H_ 31 #define _ALTQ_ALTQ_RED_H_ 32 33 #include <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 */ 45 struct 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 51 struct 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 */ 63 struct 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 71 typedef 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 */ 109 110 extern red_t *red_alloc(int, int, int, int, int, int); 111 extern void red_destroy(red_t *); 112 extern void red_getstats(red_t *, struct redstats *); 113 extern int red_addq(red_t *, class_queue_t *, struct mbuf *, 114 struct altq_pktattr *); 115 extern struct mbuf *red_getq(red_t *, class_queue_t *); 116 extern int drop_early(int, int, int); 117 extern int mark_ecn(struct mbuf *, struct altq_pktattr *, int); 118 extern struct wtab *wtab_alloc(int); 119 extern int wtab_destroy(struct wtab *); 120 extern int32_t pow_w(struct wtab *, int); 121 122 #endif /* _KERNEL */ 123 124 #endif /* _ALTQ_ALTQ_RED_H_ */ 125