1 /* $KAME: altq_red.h,v 1.8 2003/07/10 12:07:49 kjc Exp $ */ 2 /* $DragonFly: src/sys/net/altq/altq_red.h,v 1.1 2005/02/11 22:25:57 joerg Exp $ */ 3 4 /* 5 * Copyright (C) 1997-2003 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 <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 40 /* 41 * simpler versions of red parameters and statistics used by other 42 * disciplines (e.g., CBQ) 43 */ 44 struct redparams { 45 int th_min; /* red min threshold */ 46 int th_max; /* red max threshold */ 47 int inv_pmax; /* inverse of max drop probability */ 48 }; 49 50 struct redstats { 51 int q_avg; 52 struct pktcntr xmit_cnt; 53 struct pktcntr drop_cnt; 54 u_int drop_forced; 55 u_int drop_unforced; 56 u_int marked_packets; 57 }; 58 59 #ifdef _KERNEL 60 61 /* weight table structure for idle time calibration */ 62 struct wtab { 63 SLIST_ENTRY(wtab) w_link; 64 int w_weight; 65 int w_param_max; 66 int w_refcount; 67 int32_t w_tab[32]; 68 }; 69 70 typedef struct red { 71 int red_pkttime; /* average packet time in micro sec 72 used for idle calibration */ 73 int red_flags; /* red flags */ 74 75 /* red parameters */ 76 int red_weight; /* weight for EWMA */ 77 int red_inv_pmax; /* inverse of max drop probability */ 78 int red_thmin; /* red min threshold */ 79 int red_thmax; /* red max threshold */ 80 81 /* variables for internal use */ 82 int red_wshift; /* log(red_weight) */ 83 int red_thmin_s; /* th_min scaled by avgshift */ 84 int red_thmax_s; /* th_max scaled by avgshift */ 85 int red_probd; /* drop probability denominator */ 86 87 int red_avg; /* queue len avg scaled by avgshift */ 88 int red_count; /* packet count since last dropped/ 89 marked packet */ 90 int red_idle; /* queue was empty */ 91 int red_old; /* avg is above th_min */ 92 struct wtab *red_wtab; /* weight table */ 93 struct timeval red_last; /* time when the queue becomes idle */ 94 95 struct { 96 struct pktcntr xmit_cnt; 97 struct pktcntr drop_cnt; 98 u_int drop_forced; 99 u_int drop_unforced; 100 u_int marked_packets; 101 } red_stats; 102 } red_t; 103 104 /* red drop types */ 105 #define DTYPE_NODROP 0 /* no drop */ 106 #define DTYPE_FORCED 1 /* a "forced" drop */ 107 #define DTYPE_EARLY 2 /* an "unforced" (early) drop */ 108 109 red_t *red_alloc(int, int, int, int, int, int); 110 void red_destroy(red_t *); 111 void red_getstats(red_t *, struct redstats *); 112 int red_addq(red_t *, class_queue_t *, struct mbuf *, 113 struct altq_pktattr *); 114 struct mbuf *red_getq(red_t *, class_queue_t *); 115 int drop_early(int, int, int); 116 int mark_ecn(struct mbuf *, struct altq_pktattr *, int); 117 struct wtab *wtab_alloc(int); 118 int wtab_destroy(struct wtab *); 119 int32_t pow_w(struct wtab *, int); 120 121 #endif /* _KERNEL */ 122 123 #endif /* _ALTQ_ALTQ_RED_H_ */ 124