Annotation of sys/altq/altq_red.h, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: altq_red.h,v 1.5 2002/12/16 17:27:20 henning Exp $ */
2: /* $KAME: altq_red.h,v 1.5 2000/12/14 08:12:46 thorpej Exp $ */
3:
4: /*
5: * Copyright (C) 1997-2002
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_RED_H_
31: #define _ALTQ_ALTQ_RED_H_
32:
33: #include <altq/altq_classq.h>
34:
35: /* red flags */
36: #define REDF_ECN4 0x01 /* use packet marking for IPv4 packets */
37: #define REDF_ECN6 0x02 /* use packet marking for IPv6 packets */
38: #define REDF_ECN (REDF_ECN4 | REDF_ECN6)
39: #define REDF_FLOWVALVE 0x04 /* use flowvalve (aka penalty-box) */
40:
41: /*
42: * simpler versions of red parameters and statistics used by other
43: * disciplines (e.g., CBQ)
44: */
45: struct redparams {
46: int th_min; /* red min threshold */
47: int th_max; /* red max threshold */
48: int inv_pmax; /* inverse of max drop probability */
49: };
50:
51: struct redstats {
52: int q_avg;
53: struct pktcntr xmit_cnt;
54: struct pktcntr drop_cnt;
55: u_int drop_forced;
56: u_int drop_unforced;
57: u_int marked_packets;
58: };
59:
60: #ifdef _KERNEL
61:
62: /* weight table structure for idle time calibration */
63: struct wtab {
64: struct wtab *w_next;
65: int w_weight;
66: int w_param_max;
67: int w_refcount;
68: int32_t w_tab[32];
69: };
70:
71: typedef struct red {
72: int red_pkttime; /* average packet time in micro sec
73: used for idle calibration */
74: int red_flags; /* red flags */
75:
76: /* red parameters */
77: int red_weight; /* weight for EWMA */
78: int red_inv_pmax; /* inverse of max drop probability */
79: int red_thmin; /* red min threshold */
80: int red_thmax; /* red max threshold */
81:
82: /* variables for internal use */
83: int red_wshift; /* log(red_weight) */
84: int red_thmin_s; /* th_min scaled by avgshift */
85: int red_thmax_s; /* th_max scaled by avgshift */
86: int red_probd; /* drop probability denominator */
87:
88: int red_avg; /* queue len avg scaled by avgshift */
89: int red_count; /* packet count since last dropped/
90: marked packet */
91: int red_idle; /* queue was empty */
92: int red_old; /* avg is above th_min */
93: struct wtab *red_wtab; /* weight table */
94: struct timeval red_last; /* time when the queue becomes idle */
95:
96: struct {
97: struct pktcntr xmit_cnt;
98: struct pktcntr drop_cnt;
99: u_int drop_forced;
100: u_int drop_unforced;
101: u_int marked_packets;
102: } red_stats;
103: } red_t;
104:
105: /* red drop types */
106: #define DTYPE_NODROP 0 /* no drop */
107: #define DTYPE_FORCED 1 /* a "forced" drop */
108: #define DTYPE_EARLY 2 /* an "unforced" (early) drop */
109:
110: extern red_t *red_alloc(int, int, int, int, int, int);
111: extern void red_destroy(red_t *);
112: extern void red_getstats(red_t *, struct redstats *);
113: extern int red_addq(red_t *, class_queue_t *, struct mbuf *,
114: struct altq_pktattr *);
115: extern struct mbuf *red_getq(red_t *, class_queue_t *);
116: extern int drop_early(int, int, int);
117: extern int mark_ecn(struct mbuf *, struct altq_pktattr *, int);
118: extern struct wtab *wtab_alloc(int);
119: extern int wtab_destroy(struct wtab *);
120: extern int32_t pow_w(struct wtab *, int);
121:
122: #endif /* _KERNEL */
123:
124: #endif /* _ALTQ_ALTQ_RED_H_ */
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