sys/net/altq/altq_rio.h

   1 /*      $KAME: altq_rio.h,v 1.9 2003/07/10 12:07:49 kjc Exp $   */
   2 /*      $DragonFly: src/sys/net/altq/altq_rio.h,v 1.1 2005/02/11 22:25:57 joerg Exp $ */
   3
   4 /*
   5  * Copyright (C) 1998-2003
   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_RIO_H_
  31 #define _ALTQ_ALTQ_RIO_H_
  32
  33 #include <net/altq/altq_classq.h>
  34
  35 /*
  36  * RIO: RED with IN/OUT bit
  37  * (extended to support more than 2 drop precedence values)
  38  */
  39 #define RIO_NDROPPREC   3       /* number of drop precedence values */
  40
  41 /* rio flags */
  42 #define RIOF_ECN4       0x01    /* use packet marking for IPv4 packets */
  43 #define RIOF_ECN6       0x02    /* use packet marking for IPv6 packets */
  44 #define RIOF_ECN        (RIOF_ECN4 | RIOF_ECN6)
  45 #define RIOF_CLEARDSCP  0x200   /* clear diffserv codepoint */
  46
  47 #ifdef _KERNEL
  48
  49 typedef struct rio {
  50         /* per drop precedence structure */
  51         struct dropprec_state {
  52                 /* red parameters */
  53                 int     inv_pmax;       /* inverse of max drop probability */
  54                 int     th_min;         /* red min threshold */
  55                 int     th_max;         /* red max threshold */
  56
  57                 /* variables for internal use */
  58                 int     th_min_s;       /* th_min scaled by avgshift */
  59                 int     th_max_s;       /* th_max scaled by avgshift */
  60                 int     probd;          /* drop probability denominator */
  61
  62                 int     qlen;           /* queue length */
  63                 int     avg;            /* (scaled) queue length average */
  64                 int     count;          /* packet count since the last dropped/
  65                                            marked packet */
  66                 int     idle;           /* queue was empty */
  67                 int     old;            /* avg is above th_min */
  68                 struct timeval  last;   /* timestamp when queue becomes idle */
  69         } rio_precstate[RIO_NDROPPREC];
  70
  71         int              rio_wshift;    /* log(red_weight) */
  72         int              rio_weight;    /* weight for EWMA */
  73         struct wtab     *rio_wtab;      /* weight table */
  74
  75         int              rio_pkttime;   /* average packet time in micro sec
  76                                            used for idle calibration */
  77         int              rio_flags;     /* rio flags */
  78
  79         uint8_t          rio_codepoint; /* codepoint value to tag packets */
  80         uint8_t          rio_codepointmask;     /* codepoint mask bits */
  81
  82         struct redstats q_stats[RIO_NDROPPREC]; /* statistics */
  83 } rio_t;
  84
  85 rio_t           *rio_alloc(int, struct redparams *, int, int);
  86 void             rio_destroy(rio_t *);
  87 void             rio_getstats(rio_t *, struct redstats *);
  88 int              rio_addq(rio_t *, class_queue_t *, struct mbuf *,
  89                           struct altq_pktattr *);
  90 struct mbuf     *rio_getq(rio_t *, class_queue_t *);
  91
  92 #endif /* _KERNEL */
  93
  94 #endif /* _ALTQ_ALTQ_RIO_H_ */