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altq_rio.h revision 1.3 
      1 /*	$NetBSD: altq_rio.h,v 1.3 2005/02/26 23:04:16 perry 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;	/* average 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 /*
     73  * IOCTLs for RIO
     74  */
     75 #define	RIO_IF_ATTACH		_IOW('Q', 1, struct rio_interface)
     76 #define	RIO_IF_DETACH		_IOW('Q', 2, struct rio_interface)
     77 #define	RIO_ENABLE		_IOW('Q', 3, struct rio_interface)
     78 #define	RIO_DISABLE		_IOW('Q', 4, struct rio_interface)
     79 #define	RIO_CONFIG		_IOWR('Q', 6, struct rio_conf)
     80 #define	RIO_GETSTATS		_IOWR('Q', 12, struct rio_stats)
     81 #define	RIO_SETDEFAULTS		_IOW('Q', 30, struct redparams[RIO_NDROPPREC])
     82 
     83 #ifdef _KERNEL
     84 
     85 typedef struct rio {
     86 	/* per drop precedence structure */
     87 	struct dropprec_state {
     88 		/* red parameters */
     89 		int inv_pmax;	/* inverse of max drop probability */
     90 		int th_min;	/* red min threshold */
     91 		int th_max;	/* red max threshold */
     92 
     93 		/* variables for internal use */
     94 		int th_min_s;	/* th_min scaled by avgshift */
     95 		int th_max_s;	/* th_max scaled by avgshift */
     96 		int probd;	/* drop probability denominator */
     97 
     98 		int qlen;	/* queue length */
     99 		int avg;	/* (scaled) queue length average */
    100 		int count; 	/* packet count since the last dropped/marked
    101 				   packet */
    102 		int idle;	/* queue was empty */
    103 		int old;	/* avg is above th_min */
    104 		struct timeval last;  /* timestamp when queue becomes idle */
    105 	} rio_precstate[RIO_NDROPPREC];
    106 
    107 	int rio_wshift;		/* log(red_weight) */
    108 	int rio_weight;		/* weight for EWMA */
    109 	struct wtab *rio_wtab;	/* weight table */
    110 
    111 	int rio_pkttime; 	/* average packet time in micro sec
    112 				   used for idle calibration */
    113 	int rio_flags;		/* rio flags */
    114 
    115 	u_int8_t rio_codepoint;		/* codepoint value to tag packets */
    116 	u_int8_t rio_codepointmask;	/* codepoint mask bits */
    117 
    118 	struct redstats q_stats[RIO_NDROPPREC];	/* statistics */
    119 } rio_t;
    120 
    121 typedef struct rio_queue {
    122 	struct rio_queue *rq_next;	/* next red_state in the list */
    123 	struct ifaltq *rq_ifq;		/* backpointer to ifaltq */
    124 
    125 	class_queue_t *rq_q;
    126 
    127 	rio_t *rq_rio;
    128 } rio_queue_t;
    129 
    130 extern rio_t *rio_alloc __P((int, struct redparams *, int, int));
    131 extern void rio_destroy __P((rio_t *));
    132 extern void rio_getstats __P((rio_t *, struct redstats *));
    133 extern int rio_addq __P((rio_t *, class_queue_t *, struct mbuf *,
    134 			 struct altq_pktattr *));
    135 extern struct mbuf *rio_getq __P((rio_t *, class_queue_t *));
    136 extern int rio_set_meter __P((rio_t *, int, int, int));
    137 
    138 #endif /* _KERNEL */
    139 
    140 #endif /* _ALTQ_ALTQ_RIO_H_ */
    141