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Diffstat (limited to 'sys/net80211/ieee80211_rssadapt.h')
| -rw-r--r-- | sys/net80211/ieee80211_rssadapt.h | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/sys/net80211/ieee80211_rssadapt.h b/sys/net80211/ieee80211_rssadapt.h new file mode 100644 index 0000000..b454f43 --- /dev/null +++ b/sys/net80211/ieee80211_rssadapt.h @@ -0,0 +1,101 @@ +/* $FreeBSD$ */ +/* $NetBSD: ieee80211_rssadapt.h,v 1.4 2005/02/26 22:45:09 perry Exp $ */ +/*- + * Copyright (c) 2003, 2004 David Young. All rights reserved. + * + * Redistribution and use in source and binary forms, with or + * without modification, are permitted provided that the following + * conditions are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following + * disclaimer in the documentation and/or other materials provided + * with the distribution. + * 3. The name of David Young may not be used to endorse or promote + * products derived from this software without specific prior + * written permission. + * + * THIS SOFTWARE IS PROVIDED BY David Young ``AS IS'' AND ANY + * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, + * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A + * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL David + * Young BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED + * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY + * OF SUCH DAMAGE. + */ +#ifndef _NET80211_IEEE80211_RSSADAPT_H_ +#define _NET80211_IEEE80211_RSSADAPT_H_ + +/* Data-rate adaptation loosely based on "Link Adaptation Strategy + * for IEEE 802.11 WLAN via Received Signal Strength Measurement" + * by Javier del Prado Pavon and Sunghyun Choi. + */ + +/* Buckets for frames 0-128 bytes long, 129-1024, 1025-maximum. */ +#define IEEE80211_RSSADAPT_BKTS 3 +#define IEEE80211_RSSADAPT_BKT0 128 +#define IEEE80211_RSSADAPT_BKTPOWER 3 /* 2**_BKTPOWER */ + +struct ieee80211_rssadapt { + struct ieee80211vap *vap; + int interval; /* update interval (ticks) */ +}; + +struct ieee80211_rssadapt_node { + struct ieee80211_rssadapt *ra_rs; /* backpointer */ + struct ieee80211_rateset ra_rates; /* negotiated rates */ + int ra_rix; /* current rate index */ + int ra_ticks; /* time of last update */ + int ra_last_raise; /* time of last rate raise */ + int ra_raise_interval; /* rate raise time threshold */ + + /* Tx failures in this update interval */ + uint32_t ra_nfail; + /* Tx successes in this update interval */ + uint32_t ra_nok; + /* exponential average packets/second */ + uint32_t ra_pktrate; + /* RSSI threshold for each Tx rate */ + uint16_t ra_rate_thresh[IEEE80211_RSSADAPT_BKTS] + [IEEE80211_RATE_SIZE]; +}; + +void ieee80211_rssadapt_init(struct ieee80211_rssadapt *, + struct ieee80211vap *, int); +void ieee80211_rssadapt_cleanup(struct ieee80211_rssadapt *); +void ieee80211_rssadapt_setinterval(struct ieee80211_rssadapt *, int); +void ieee80211_rssadapt_node_init(struct ieee80211_rssadapt *, + struct ieee80211_rssadapt_node *, struct ieee80211_node *); +int ieee80211_rssadapt_choose(struct ieee80211_node *, + struct ieee80211_rssadapt_node *, u_int); + +/* NB: these are public only for the inline below */ +void ieee80211_rssadapt_raise_rate(struct ieee80211_rssadapt_node *, + int pktlen, int rssi); +void ieee80211_rssadapt_lower_rate(struct ieee80211_rssadapt_node *, + int pktlen, int rssi); + +#define IEEE80211_RSSADAPT_SUCCESS 1 +#define IEEE80211_RSSADAPT_FAILURE 0 + +static __inline void +ieee80211_rssadapt_tx_complete(struct ieee80211_rssadapt_node *ra, + int success, int pktlen, int rssi) +{ + if (success) { + ra->ra_nok++; + if ((ra->ra_rix + 1) < ra->ra_rates.rs_nrates && + (ticks - ra->ra_last_raise) >= ra->ra_raise_interval) + ieee80211_rssadapt_raise_rate(ra, pktlen, rssi); + } else { + ra->ra_nfail++; + ieee80211_rssadapt_lower_rate(ra, pktlen, rssi); + } +} +#endif /* _NET80211_IEEE80211_RSSADAPT_H_ */ |
