1 /* $FreeBSD$ */
2 /* $OpenBSD: ieee80211_amrr.h,v 1.3 2006/06/17 19:34:31 damien Exp $ */
3
4 /*-
5 * Copyright (c) 2006
6 * Damien Bergamini <damien.bergamini@free.fr>
7 *
8 * Permission to use, copy, modify, and distribute this software for any
9 * purpose with or without fee is hereby granted, provided that the above
10 * copyright notice and this permission notice appear in all copies.
11 *
12 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
13 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
14 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
15 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
16 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19 */
20 #ifndef _NET80211_IEEE80211_AMRR_H_
21 #define _NET80211_IEEE80211_AMRR_H_
22
23 /*-
24 * Naive implementation of the Adaptive Multi Rate Retry algorithm:
25 *
26 * "IEEE 802.11 Rate Adaptation: A Practical Approach"
27 * Mathieu Lacage, Hossein Manshaei, Thierry Turletti
28 * INRIA Sophia - Projet Planete
29 * http://www-sop.inria.fr/rapports/sophia/RR-5208.html
30 */
31
32 /*
33 * Rate control settings.
34 */
35 struct ieee80211vap;
36
37 struct ieee80211_amrr {
38 u_int amrr_min_success_threshold;
39 u_int amrr_max_success_threshold;
40 int amrr_interval; /* update interval (ticks) */
41 };
42
43 #define IEEE80211_AMRR_MIN_SUCCESS_THRESHOLD 1
44 #define IEEE80211_AMRR_MAX_SUCCESS_THRESHOLD 15
45
46 /*
47 * Rate control state for a given node.
48 */
49 struct ieee80211_amrr_node {
50 struct ieee80211_amrr *amn_amrr;/* backpointer */
51 int amn_rix; /* current rate index */
52 int amn_ticks; /* time of last update */
53 /* statistics */
54 u_int amn_txcnt;
55 u_int amn_success;
56 u_int amn_success_threshold;
57 u_int amn_recovery;
58 u_int amn_retrycnt;
59 };
60
61 void ieee80211_amrr_init(struct ieee80211_amrr *, struct ieee80211vap *,
62 int, int, int);
63 void ieee80211_amrr_cleanup(struct ieee80211_amrr *);
64 void ieee80211_amrr_setinterval(struct ieee80211_amrr *, int);
65 void ieee80211_amrr_node_init(struct ieee80211_amrr *,
66 struct ieee80211_amrr_node *, struct ieee80211_node *);
67 int ieee80211_amrr_choose(struct ieee80211_node *,
68 struct ieee80211_amrr_node *);
69
70 #define IEEE80211_AMRR_SUCCESS 1
71 #define IEEE80211_AMRR_FAILURE 0
72
73 /*
74 * Update statistics with tx complete status. Ok is non-zero
75 * if the packet is known to be ACK'd. Retries has the number
76 * retransmissions (i.e. xmit attempts - 1).
77 */
78 static __inline void
79 ieee80211_amrr_tx_complete(struct ieee80211_amrr_node *amn,
80 int ok, int retries)
81 {
82 amn->amn_txcnt++;
83 if (ok)
84 amn->amn_success++;
85 amn->amn_retrycnt += retries;
86 }
87
88 /*
89 * Set tx count/retry statistics explicitly. Intended for
90 * drivers that poll the device for statistics maintained
91 * in the device.
92 */
93 static __inline void
94 ieee80211_amrr_tx_update(struct ieee80211_amrr_node *amn,
95 int txcnt, int success, int retrycnt)
96 {
97 amn->amn_txcnt = txcnt;
98 amn->amn_success = success;
99 amn->amn_retrycnt = retrycnt;
100 }
101 #endif /* _NET80211_IEEE80211_AMRR_H_ */
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