FreeBSD/Linux Kernel Cross Reference
sys/net/altq/altq_red.h

     /*-
      * Copyright (C) 1997-2003
      *      Sony Computer Science Laboratories Inc.  All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY SONY CSL AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL SONY CSL OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $KAME: altq_red.h,v 1.8 2003/07/10 12:07:49 kjc Exp $
     * $FreeBSD$
     */
    
    #ifndef _ALTQ_ALTQ_RED_H_
    #define _ALTQ_ALTQ_RED_H_
    
    #include <net/altq/altq_classq.h>
    
    /* red flags */
    #define REDF_ECN4       0x01    /* use packet marking for IPv4 packets */
    #define REDF_ECN6       0x02    /* use packet marking for IPv6 packets */
    #define REDF_ECN        (REDF_ECN4 | REDF_ECN6)
    #define REDF_FLOWVALVE  0x04    /* use flowvalve (aka penalty-box) */
    
    /*
     * simpler versions of red parameters and statistics used by other
     * disciplines (e.g., CBQ)
     */
    struct redparams {
            int th_min;             /* red min threshold */
            int th_max;             /* red max threshold */
            int inv_pmax;           /* inverse of max drop probability */
    };
    
    struct redstats {
            int             q_avg;
            struct pktcntr  xmit_cnt;
            struct pktcntr  drop_cnt;
            u_int           drop_forced;
            u_int           drop_unforced;
            u_int           marked_packets;
    };
    
    #ifdef _KERNEL
    
    /* weight table structure for idle time calibration */
    struct wtab {
            struct wtab     *w_next;
            int              w_weight;
            int              w_param_max;
            int              w_refcount;
            int32_t          w_tab[32];
    };
    
    typedef struct red {
            int             red_pkttime;    /* average packet time in micro sec
                                               used for idle calibration */
            int             red_flags;      /* red flags */
    
            /* red parameters */
            int             red_weight;     /* weight for EWMA */
            int             red_inv_pmax;   /* inverse of max drop probability */
            int             red_thmin;      /* red min threshold */
            int             red_thmax;      /* red max threshold */
    
            /* variables for internal use */
            int             red_wshift;     /* log(red_weight) */
            int             red_thmin_s;    /* th_min scaled by avgshift */
            int             red_thmax_s;    /* th_max scaled by avgshift */
            int             red_probd;      /* drop probability denominator */
    
            int             red_avg;        /* queue len avg scaled by avgshift */
            int             red_count;      /* packet count since last dropped/
                                               marked packet */
            int             red_idle;       /* queue was empty */
            int             red_old;        /* avg is above th_min */
            struct wtab     *red_wtab;      /* weight table */
            struct timeval   red_last;      /* time when the queue becomes idle */
    
            struct {
                    struct pktcntr  xmit_cnt;
                    struct pktcntr  drop_cnt;
                    u_int           drop_forced;
                   u_int           drop_unforced;
                   u_int           marked_packets;
           } red_stats;
   } red_t;
   
   /* red drop types */
   #define DTYPE_NODROP    0       /* no drop */
   #define DTYPE_FORCED    1       /* a "forced" drop */
   #define DTYPE_EARLY     2       /* an "unforced" (early) drop */
   
   extern red_t            *red_alloc(int, int, int, int, int, int);
   extern void              red_destroy(red_t *);
   extern void              red_getstats(red_t *, struct redstats *);
   extern int               red_addq(red_t *, class_queue_t *, struct mbuf *,
                                struct altq_pktattr *);
   extern struct mbuf      *red_getq(red_t *, class_queue_t *);
   extern int               drop_early(int, int, int);
   extern int               mark_ecn(struct mbuf *, struct altq_pktattr *, int);
   extern struct wtab      *wtab_alloc(int);
   extern int               wtab_destroy(struct wtab *);
   extern int32_t           pow_w(struct wtab *, int);
   
   #endif /* _KERNEL */
   
   #endif /* _ALTQ_ALTQ_RED_H_ */

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