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Annotation of sys/altq/altq_rio.h, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: altq_rio.h,v 1.6 2003/03/13 16:33:46 kjc Exp $        */
        !             2: /*     $KAME: altq_rio.h,v 1.5 2000/12/14 08:12:46 thorpej Exp $       */
        !             3:
        !             4: /*
        !             5:  * Copyright (C) 1998-2000
        !             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 <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: struct rio_interface {
        !            42:        char    rio_ifname[IFNAMSIZ];
        !            43: };
        !            44:
        !            45: struct rio_stats {
        !            46:        struct rio_interface    iface;
        !            47:        int                     q_len[RIO_NDROPPREC];
        !            48:        struct redstats         q_stats[RIO_NDROPPREC];
        !            49:
        !            50:        /* static red parameters */
        !            51:        int                     q_limit;
        !            52:        int                     weight;
        !            53:        int                     flags;
        !            54:        struct redparams        q_params[RIO_NDROPPREC];
        !            55: };
        !            56:
        !            57: struct rio_conf {
        !            58:        struct rio_interface    iface;
        !            59:        struct redparams        q_params[RIO_NDROPPREC];
        !            60:        int                     rio_weight;     /* weight for EWMA */
        !            61:        int                     rio_limit;      /* max queue length */
        !            62:        int                     rio_pkttime;    /* avg packet time in usec */
        !            63:        int                     rio_flags;      /* see below */
        !            64: };
        !            65:
        !            66: /* rio flags */
        !            67: #define        RIOF_ECN4       0x01    /* use packet marking for IPv4 packets */
        !            68: #define        RIOF_ECN6       0x02    /* use packet marking for IPv6 packets */
        !            69: #define        RIOF_ECN        (RIOF_ECN4 | RIOF_ECN6)
        !            70: #define        RIOF_CLEARDSCP  0x200   /* clear diffserv codepoint */
        !            71:
        !            72: #ifdef _KERNEL
        !            73:
        !            74: typedef struct rio {
        !            75:        /* per drop precedence structure */
        !            76:        struct dropprec_state {
        !            77:                /* red parameters */
        !            78:                int     inv_pmax;       /* inverse of max drop probability */
        !            79:                int     th_min;         /* red min threshold */
        !            80:                int     th_max;         /* red max threshold */
        !            81:
        !            82:                /* variables for internal use */
        !            83:                int     th_min_s;       /* th_min scaled by avgshift */
        !            84:                int     th_max_s;       /* th_max scaled by avgshift */
        !            85:                int     probd;          /* drop probability denominator */
        !            86:
        !            87:                int     qlen;           /* queue length */
        !            88:                int     avg;            /* (scaled) queue length average */
        !            89:                int     count;          /* packet count since the last dropped/
        !            90:                                           marked packet */
        !            91:                int     idle;           /* queue was empty */
        !            92:                int     old;            /* avg is above th_min */
        !            93:                struct timeval  last;   /* timestamp when queue becomes idle */
        !            94:        } rio_precstate[RIO_NDROPPREC];
        !            95:
        !            96:        int              rio_wshift;    /* log(red_weight) */
        !            97:        int              rio_weight;    /* weight for EWMA */
        !            98:        struct wtab     *rio_wtab;      /* weight table */
        !            99:
        !           100:        int              rio_pkttime;   /* average packet time in micro sec
        !           101:                                           used for idle calibration */
        !           102:        int              rio_flags;     /* rio flags */
        !           103:
        !           104:        u_int8_t         rio_codepoint; /* codepoint value to tag packets */
        !           105:        u_int8_t         rio_codepointmask;     /* codepoint mask bits */
        !           106:
        !           107:        struct redstats q_stats[RIO_NDROPPREC]; /* statistics */
        !           108: } rio_t;
        !           109:
        !           110: typedef struct rio_queue {
        !           111:        struct rio_queue        *rq_next;       /* next red_state in the list */
        !           112:        struct ifaltq           *rq_ifq;        /* backpointer to ifaltq */
        !           113:
        !           114:        class_queue_t           *rq_q;
        !           115:
        !           116:        rio_t                   *rq_rio;
        !           117: } rio_queue_t;
        !           118:
        !           119: extern rio_t           *rio_alloc(int, struct redparams *, int, int);
        !           120: extern void             rio_destroy(rio_t *);
        !           121: extern void             rio_getstats(rio_t *, struct redstats *);
        !           122: extern int              rio_addq(rio_t *, class_queue_t *, struct mbuf *,
        !           123:                             struct altq_pktattr *);
        !           124: extern struct mbuf     *rio_getq(rio_t *, class_queue_t *);
        !           125:
        !           126: #endif /* _KERNEL */
        !           127:
        !           128: #endif /* _ALTQ_ALTQ_RIO_H_ */