1/*-
2 * Copyright (C) 1998-2003
3 * Sony Computer Science Laboratories Inc. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY SONY CSL AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL SONY CSL OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $KAME: altq_rio.h,v 1.9 2003/07/10 12:07:49 kjc Exp $
27 */
28
29#ifndef _ALTQ_ALTQ_RIO_H_
30#define _ALTQ_ALTQ_RIO_H_
31
32#include <net/altq/altq_classq.h>
33
34/*
35 * RIO: RED with IN/OUT bit
36 * (extended to support more than 2 drop precedence values)
37 */
38#define RIO_NDROPPREC 3 /* number of drop precedence values */
39
40/* rio flags */
41#define RIOF_ECN4 0x01 /* use packet marking for IPv4 packets */
42#define RIOF_ECN6 0x02 /* use packet marking for IPv6 packets */
43#define RIOF_ECN (RIOF_ECN4 | RIOF_ECN6)
44#define RIOF_CLEARDSCP 0x200 /* clear diffserv codepoint */
45
46#ifdef _KERNEL
47
48typedef struct rio {
49 /* per drop precedence structure */
50 struct dropprec_state {
51 /* red parameters */
52 int inv_pmax; /* inverse of max drop probability */
53 int th_min; /* red min threshold */
54 int th_max; /* red max threshold */
55
56 /* variables for internal use */
57 int th_min_s; /* th_min scaled by avgshift */
58 int th_max_s; /* th_max scaled by avgshift */
59 int probd; /* drop probability denominator */
60
61 int qlen; /* queue length */
62 int avg; /* (scaled) queue length average */
63 int count; /* packet count since the last dropped/
64 marked packet */
65 int idle; /* queue was empty */
66 int old; /* avg is above th_min */
67 struct timeval last; /* timestamp when queue becomes idle */
68 } rio_precstate[RIO_NDROPPREC];
69
70 int rio_wshift; /* log(red_weight) */
71 int rio_weight; /* weight for EWMA */
72 struct wtab *rio_wtab; /* weight table */
73
74 int rio_pkttime; /* average packet time in micro sec
75 used for idle calibration */
76 int rio_flags; /* rio flags */
77
78 u_int8_t rio_codepoint; /* codepoint value to tag packets */
79 u_int8_t rio_codepointmask; /* codepoint mask bits */
80
81 struct redstats q_stats[RIO_NDROPPREC]; /* statistics */
82} rio_t;
83
84extern rio_t *rio_alloc(int, struct redparams *, int, int);
85extern void rio_destroy(rio_t *);
86extern void rio_getstats(rio_t *, struct redstats *);
87extern int rio_addq(rio_t *, class_queue_t *, struct mbuf *,
88 struct altq_pktattr *);
89extern struct mbuf *rio_getq(rio_t *, class_queue_t *);
90
91#endif /* _KERNEL */
92
93#endif /* _ALTQ_ALTQ_RIO_H_ */