b032f27c36
Note this includes changes to all drivers and moves some device firmware loading to use firmware(9) and a separate module (e.g. ral). Also there no longer are separate wlan_scan* modules; this functionality is now bundled into the wlan module. Supported by: Hobnob and Marvell Reviewed by: many Obtained from: Atheros (some bits)
102 lines
4.0 KiB
C
102 lines
4.0 KiB
C
/* $FreeBSD$ */
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/* $NetBSD: ieee80211_rssadapt.h,v 1.4 2005/02/26 22:45:09 perry Exp $ */
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/*-
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* Copyright (c) 2003, 2004 David Young. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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* 3. The name of David Young may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY David Young ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL David
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* Young BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*/
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#ifndef _NET80211_IEEE80211_RSSADAPT_H_
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#define _NET80211_IEEE80211_RSSADAPT_H_
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/* Data-rate adaptation loosely based on "Link Adaptation Strategy
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* for IEEE 802.11 WLAN via Received Signal Strength Measurement"
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* by Javier del Prado Pavon and Sunghyun Choi.
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*/
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/* Buckets for frames 0-128 bytes long, 129-1024, 1025-maximum. */
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#define IEEE80211_RSSADAPT_BKTS 3
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#define IEEE80211_RSSADAPT_BKT0 128
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#define IEEE80211_RSSADAPT_BKTPOWER 3 /* 2**_BKTPOWER */
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struct ieee80211_rssadapt {
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struct ieee80211vap *vap;
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int interval; /* update interval (ticks) */
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};
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struct ieee80211_rssadapt_node {
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struct ieee80211_rssadapt *ra_rs; /* backpointer */
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struct ieee80211_rateset ra_rates; /* negotiated rates */
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int ra_rix; /* current rate index */
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int ra_ticks; /* time of last update */
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int ra_last_raise; /* time of last rate raise */
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int ra_raise_interval; /* rate raise time threshold */
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/* Tx failures in this update interval */
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uint32_t ra_nfail;
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/* Tx successes in this update interval */
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uint32_t ra_nok;
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/* exponential average packets/second */
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uint32_t ra_pktrate;
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/* RSSI threshold for each Tx rate */
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uint16_t ra_rate_thresh[IEEE80211_RSSADAPT_BKTS]
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[IEEE80211_RATE_SIZE];
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};
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void ieee80211_rssadapt_init(struct ieee80211_rssadapt *,
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struct ieee80211vap *, int);
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void ieee80211_rssadapt_cleanup(struct ieee80211_rssadapt *);
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void ieee80211_rssadapt_setinterval(struct ieee80211_rssadapt *, int);
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void ieee80211_rssadapt_node_init(struct ieee80211_rssadapt *,
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struct ieee80211_rssadapt_node *, struct ieee80211_node *);
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int ieee80211_rssadapt_choose(struct ieee80211_node *,
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struct ieee80211_rssadapt_node *, u_int);
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/* NB: these are public only for the inline below */
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void ieee80211_rssadapt_raise_rate(struct ieee80211_rssadapt_node *,
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int pktlen, int rssi);
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void ieee80211_rssadapt_lower_rate(struct ieee80211_rssadapt_node *,
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int pktlen, int rssi);
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#define IEEE80211_RSSADAPT_SUCCESS 1
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#define IEEE80211_RSSADAPT_FAILURE 0
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static __inline void
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ieee80211_rssadapt_tx_complete(struct ieee80211_rssadapt_node *ra,
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int success, int pktlen, int rssi)
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{
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if (success) {
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ra->ra_nok++;
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if ((ra->ra_rix + 1) < ra->ra_rates.rs_nrates &&
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(ticks - ra->ra_last_raise) >= ra->ra_raise_interval)
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ieee80211_rssadapt_raise_rate(ra, pktlen, rssi);
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} else {
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ra->ra_nfail++;
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ieee80211_rssadapt_lower_rate(ra, pktlen, rssi);
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}
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}
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#endif /* _NET80211_IEEE80211_RSSADAPT_H_ */
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