sys/altq/altq_red.h

   1 /*      $NetBSD: altq_red.h,v 1.4.12.1 2006/03/18 12:08:18 peter Exp $  */
   2 /*      $KAME: altq_red.h,v 1.8 2003/07/10 12:07:49 kjc 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 <altq/altq_classq.h>
  34
  35 #ifdef ALTQ3_COMPAT
  36 struct red_interface {
  37         char    red_ifname[IFNAMSIZ];
  38 };
  39
  40 struct red_stats {
  41         struct red_interface iface;
  42         int q_len;
  43         int q_avg;
  44
  45         struct pktcntr  xmit_cnt;
  46         struct pktcntr  drop_cnt;
  47         u_int           drop_forced;
  48         u_int           drop_unforced;
  49         u_int           marked_packets;
  50
  51         /* static red parameters */
  52         int q_limit;
  53         int weight;
  54         int inv_pmax;
  55         int th_min;
  56         int th_max;
  57
  58         /* flowvalve related stuff */
  59         u_int fv_flows;
  60         u_int fv_pass;
  61         u_int fv_predrop;
  62         u_int fv_alloc;
  63         u_int fv_escape;
  64 };
  65
  66 struct red_conf {
  67         struct red_interface iface;
  68         int red_weight;         /* weight for EWMA */
  69         int red_inv_pmax;       /* inverse of max drop probability */
  70         int red_thmin;          /* red min threshold */
  71         int red_thmax;          /* red max threshold */
  72         int red_limit;          /* max queue length */
  73         int red_pkttime;        /* average packet time in usec */
  74         int red_flags;          /* see below */
  75 };
  76 #endif /* ALTQ3_COMPAT */
  77
  78 /* red flags */
  79 #define REDF_ECN4       0x01    /* use packet marking for IPv4 packets */
  80 #define REDF_ECN6       0x02    /* use packet marking for IPv6 packets */
  81 #define REDF_ECN        (REDF_ECN4 | REDF_ECN6)
  82 #define REDF_FLOWVALVE  0x04    /* use flowvalve (aka penalty-box) */
  83
  84 /*
  85  * simpler versions of red parameters and statistics used by other
  86  * disciplines (e.g., CBQ)
  87  */
  88 struct redparams {
  89         int th_min;             /* red min threshold */
  90         int th_max;             /* red max threshold */
  91         int inv_pmax;           /* inverse of max drop probability */
  92 };
  93
  94 struct redstats {
  95         int             q_avg;
  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 };
 102
 103 #ifdef ALTQ3_COMPAT
 104 /*
 105  * IOCTLs for RED
 106  */
 107 #define RED_IF_ATTACH           _IOW('Q', 1, struct red_interface)
 108 #define RED_IF_DETACH           _IOW('Q', 2, struct red_interface)
 109 #define RED_ENABLE              _IOW('Q', 3, struct red_interface)
 110 #define RED_DISABLE             _IOW('Q', 4, struct red_interface)
 111 #define RED_CONFIG              _IOWR('Q', 6, struct red_conf)
 112 #define RED_GETSTATS            _IOWR('Q', 12, struct red_stats)
 113 #define RED_SETDEFAULTS         _IOW('Q', 30, struct redparams)
 114 #endif /* ALTQ3_COMPAT */
 115
 116 #ifdef _KERNEL
 117
 118 #ifdef ALTQ3_COMPAT
 119 struct flowvalve;
 120 #endif
 121
 122 /* weight table structure for idle time calibration */
 123 struct wtab {
 124         struct wtab     *w_next;
 125         int              w_weight;
 126         int              w_param_max;
 127         int              w_refcount;
 128         int32_t          w_tab[32];
 129 };
 130
 131 typedef struct red {
 132         int             red_pkttime;    /* average packet time in micro sec
 133                                            used for idle calibration */
 134         int             red_flags;      /* red flags */
 135
 136         /* red parameters */
 137         int             red_weight;     /* weight for EWMA */
 138         int             red_inv_pmax;   /* inverse of max drop probability */
 139         int             red_thmin;      /* red min threshold */
 140         int             red_thmax;      /* red max threshold */
 141
 142         /* variables for internal use */
 143         int             red_wshift;     /* log(red_weight) */
 144         int             red_thmin_s;    /* th_min scaled by avgshift */
 145         int             red_thmax_s;    /* th_max scaled by avgshift */
 146         int             red_probd;      /* drop probability denominator */
 147
 148         int             red_avg;        /* queue len avg scaled by avgshift */
 149         int             red_count;      /* packet count since last dropped/
 150                                            marked packet */
 151         int             red_idle;       /* queue was empty */
 152         int             red_old;        /* avg is above th_min */
 153         struct wtab     *red_wtab;      /* weight table */
 154         struct timeval   red_last;      /* time when the queue becomes idle */
 155
 156 #ifdef ALTQ3_COMPAT
 157         struct flowvalve *red_flowvalve;        /* flowvalve state */
 158 #endif
 159
 160         struct {
 161                 struct pktcntr  xmit_cnt;
 162                 struct pktcntr  drop_cnt;
 163                 u_int           drop_forced;
 164                 u_int           drop_unforced;
 165                 u_int           marked_packets;
 166         } red_stats;
 167 } red_t;
 168
 169 #ifdef ALTQ3_COMPAT
 170 typedef struct red_queue {
 171         struct red_queue *rq_next;      /* next red_state in the list */
 172         struct ifaltq *rq_ifq;          /* backpointer to ifaltq */
 173
 174         class_queue_t *rq_q;
 175
 176         red_t *rq_red;
 177 } red_queue_t;
 178 #endif /* ALTQ3_COMPAT */
 179
 180 /* red drop types */
 181 #define DTYPE_NODROP    0       /* no drop */
 182 #define DTYPE_FORCED    1       /* a "forced" drop */
 183 #define DTYPE_EARLY     2       /* an "unforced" (early) drop */
 184
 185 extern red_t            *red_alloc(int, int, int, int, int, int);
 186 extern void              red_destroy(red_t *);
 187 extern void              red_getstats(red_t *, struct redstats *);
 188 extern int               red_addq(red_t *, class_queue_t *, struct mbuf *,
 189                              struct altq_pktattr *);
 190 extern struct mbuf      *red_getq(red_t *, class_queue_t *);
 191 extern int               drop_early(int, int, int);
 192 extern int               mark_ecn(struct mbuf *, struct altq_pktattr *, int);
 193 extern struct wtab      *wtab_alloc(int);
 194 extern int               wtab_destroy(struct wtab *);
 195 extern int32_t           pow_w(struct wtab *, int);
 196
 197 #endif /* _KERNEL */
 198
 199 #endif /* _ALTQ_ALTQ_RED_H_ */