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/* $FreeBSD$ */
/* $OpenBSD: ieee80211_amrr.h,v 1.3 2006/06/17 19:34:31 damien Exp $ */
/*-
* Copyright (c) 2006
* Damien Bergamini <damien.bergamini@free.fr>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef _NET80211_IEEE80211_AMRR_H_
#define _NET80211_IEEE80211_AMRR_H_
/*-
* Naive implementation of the Adaptive Multi Rate Retry algorithm:
*
* "IEEE 802.11 Rate Adaptation: A Practical Approach"
* Mathieu Lacage, Hossein Manshaei, Thierry Turletti
* INRIA Sophia - Projet Planete
* http://www-sop.inria.fr/rapports/sophia/RR-5208.html
*/
/*
* Rate control settings.
*/
struct ieee80211vap;
struct ieee80211_amrr {
u_int amrr_min_success_threshold;
u_int amrr_max_success_threshold;
int amrr_interval; /* update interval (ticks) */
};
#define IEEE80211_AMRR_MIN_SUCCESS_THRESHOLD 1
#define IEEE80211_AMRR_MAX_SUCCESS_THRESHOLD 15
/*
* Rate control state for a given node.
*/
struct ieee80211_amrr_node {
struct ieee80211_amrr *amn_amrr;/* backpointer */
int amn_rix; /* current rate index */
int amn_ticks; /* time of last update */
/* statistics */
u_int amn_txcnt;
u_int amn_success;
u_int amn_success_threshold;
u_int amn_recovery;
u_int amn_retrycnt;
};
void ieee80211_amrr_init(struct ieee80211_amrr *, struct ieee80211vap *,
int, int, int);
void ieee80211_amrr_cleanup(struct ieee80211_amrr *);
void ieee80211_amrr_setinterval(struct ieee80211_amrr *, int);
void ieee80211_amrr_node_init(struct ieee80211_amrr *,
struct ieee80211_amrr_node *, struct ieee80211_node *);
int ieee80211_amrr_choose(struct ieee80211_node *,
struct ieee80211_amrr_node *);
#define IEEE80211_AMRR_SUCCESS 1
#define IEEE80211_AMRR_FAILURE 0
/*
* Update statistics with tx complete status. Ok is non-zero
* if the packet is known to be ACK'd. Retries has the number
* retransmissions (i.e. xmit attempts - 1).
*/
static __inline void
ieee80211_amrr_tx_complete(struct ieee80211_amrr_node *amn,
int ok, int retries)
{
amn->amn_txcnt++;
if (ok)
amn->amn_success++;
amn->amn_retrycnt += retries;
}
/*
* Set tx count/retry statistics explicitly. Intended for
* drivers that poll the device for statistics maintained
* in the device.
*/
static __inline void
ieee80211_amrr_tx_update(struct ieee80211_amrr_node *amn,
int txcnt, int success, int retrycnt)
{
amn->amn_txcnt = txcnt;
amn->amn_success = success;
amn->amn_retrycnt = retrycnt;
}
#endif /* _NET80211_IEEE80211_AMRR_H_ */
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