1 /* $KAME: altq_red.h,v 1.8 2003/07/10 12:07:49 kjc Exp $ */ 2 3 /* 4 * Copyright (C) 1997-2003 5 * Sony Computer Science Laboratories Inc. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY SONY CSL AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL SONY CSL OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #ifndef _ALTQ_ALTQ_RED_H_ 30 #define _ALTQ_ALTQ_RED_H_ 31 32 #include <altq/altq_classq.h> 33 34 #ifdef ALTQ3_COMPAT 35 struct red_interface { 36 char red_ifname[IFNAMSIZ]; 37 }; 38 39 struct red_stats { 40 struct red_interface iface; 41 int q_len; 42 int q_avg; 43 44 struct pktcntr xmit_cnt; 45 struct pktcntr drop_cnt; 46 u_int drop_forced; 47 u_int drop_unforced; 48 u_int marked_packets; 49 50 /* static red parameters */ 51 int q_limit; 52 int weight; 53 int inv_pmax; 54 int th_min; 55 int th_max; 56 57 /* flowvalve related stuff */ 58 u_int fv_flows; 59 u_int fv_pass; 60 u_int fv_predrop; 61 u_int fv_alloc; 62 u_int fv_escape; 63 }; 64 65 struct red_conf { 66 struct red_interface iface; 67 int red_weight; /* weight for EWMA */ 68 int red_inv_pmax; /* inverse of max drop probability */ 69 int red_thmin; /* red min threshold */ 70 int red_thmax; /* red max threshold */ 71 int red_limit; /* max queue length */ 72 int red_pkttime; /* average packet time in usec */ 73 int red_flags; /* see below */ 74 }; 75 #endif /* ALTQ3_COMPAT */ 76 77 /* red flags */ 78 #define REDF_ECN4 0x01 /* use packet marking for IPv4 packets */ 79 #define REDF_ECN6 0x02 /* use packet marking for IPv6 packets */ 80 #define REDF_ECN (REDF_ECN4 | REDF_ECN6) 81 #define REDF_FLOWVALVE 0x04 /* use flowvalve (aka penalty-box) */ 82 83 /* 84 * simpler versions of red parameters and statistics used by other 85 * disciplines (e.g., CBQ) 86 */ 87 struct redparams { 88 int th_min; /* red min threshold */ 89 int th_max; /* red max threshold */ 90 int inv_pmax; /* inverse of max drop probability */ 91 }; 92 93 struct redstats { 94 int q_avg; 95 struct pktcntr xmit_cnt; 96 struct pktcntr drop_cnt; 97 u_int drop_forced; 98 u_int drop_unforced; 99 u_int marked_packets; 100 }; 101 102 #ifdef ALTQ3_COMPAT 103 /* 104 * IOCTLs for RED 105 */ 106 #define RED_IF_ATTACH _IOW('Q', 1, struct red_interface) 107 #define RED_IF_DETACH _IOW('Q', 2, struct red_interface) 108 #define RED_ENABLE _IOW('Q', 3, struct red_interface) 109 #define RED_DISABLE _IOW('Q', 4, struct red_interface) 110 #define RED_CONFIG _IOWR('Q', 6, struct red_conf) 111 #define RED_GETSTATS _IOWR('Q', 12, struct red_stats) 112 #define RED_SETDEFAULTS _IOW('Q', 30, struct redparams) 113 #endif /* ALTQ3_COMPAT */ 114 115 #ifdef _KERNEL 116 117 #ifdef ALTQ3_COMPAT 118 struct flowvalve; 119 #endif 120 121 /* weight table structure for idle time calibration */ 122 struct wtab { 123 struct wtab *w_next; 124 int w_weight; 125 int w_param_max; 126 int w_refcount; 127 int32_t w_tab[32]; 128 }; 129 130 typedef struct red { 131 int red_pkttime; /* average packet time in micro sec 132 used for idle calibration */ 133 int red_flags; /* red flags */ 134 135 /* red parameters */ 136 int red_weight; /* weight for EWMA */ 137 int red_inv_pmax; /* inverse of max drop probability */ 138 int red_thmin; /* red min threshold */ 139 int red_thmax; /* red max threshold */ 140 141 /* variables for internal use */ 142 int red_wshift; /* log(red_weight) */ 143 int red_thmin_s; /* th_min scaled by avgshift */ 144 int red_thmax_s; /* th_max scaled by avgshift */ 145 int red_probd; /* drop probability denominator */ 146 147 int red_avg; /* queue len avg scaled by avgshift */ 148 int red_count; /* packet count since last dropped/ 149 marked packet */ 150 int red_idle; /* queue was empty */ 151 int red_old; /* avg is above th_min */ 152 struct wtab *red_wtab; /* weight table */ 153 struct timeval red_last; /* time when the queue becomes idle */ 154 155 #ifdef ALTQ3_COMPAT 156 struct flowvalve *red_flowvalve; /* flowvalve state */ 157 #endif 158 159 struct { 160 struct pktcntr xmit_cnt; 161 struct pktcntr drop_cnt; 162 u_int drop_forced; 163 u_int drop_unforced; 164 u_int marked_packets; 165 } red_stats; 166 } red_t; 167 168 #ifdef ALTQ3_COMPAT 169 typedef struct red_queue { 170 struct red_queue *rq_next; /* next red_state in the list */ 171 struct ifaltq *rq_ifq; /* backpointer to ifaltq */ 172 173 class_queue_t *rq_q; 174 175 red_t *rq_red; 176 } red_queue_t; 177 #endif /* ALTQ3_COMPAT */ 178 179 /* red drop types */ 180 #define DTYPE_NODROP 0 /* no drop */ 181 #define DTYPE_FORCED 1 /* a "forced" drop */ 182 #define DTYPE_EARLY 2 /* an "unforced" (early) drop */ 183 184 extern red_t *red_alloc(int, int, int, int, int, int); 185 extern void red_destroy(red_t *); 186 extern void red_getstats(red_t *, struct redstats *); 187 extern int red_addq(red_t *, class_queue_t *, struct mbuf *, 188 struct altq_pktattr *); 189 extern struct mbuf *red_getq(red_t *, class_queue_t *); 190 extern int drop_early(int, int, int); 191 extern int mark_ecn(struct mbuf *, struct altq_pktattr *, int); 192 extern struct wtab *wtab_alloc(int); 193 extern int wtab_destroy(struct wtab *); 194 extern int32_t pow_w(struct wtab *, int); 195 196 #endif /* _KERNEL */ 197 198 #endif /* _ALTQ_ALTQ_RED_H_ */ 199