sys/net/altq/altq_red.h

   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_ */