The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/net80211/ieee80211_rssadapt.h

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    1 /*      $FreeBSD: releng/8.0/sys/net80211/ieee80211_rssadapt.h 178354 2008-04-20 20:35:46Z sam $        */
    2 /* $NetBSD: ieee80211_rssadapt.h,v 1.4 2005/02/26 22:45:09 perry Exp $ */
    3 /*-
    4  * Copyright (c) 2003, 2004 David Young.  All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or
    7  * without modification, are permitted provided that the following
    8  * conditions are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above
   12  *    copyright notice, this list of conditions and the following
   13  *    disclaimer in the documentation and/or other materials provided
   14  *    with the distribution.
   15  * 3. The name of David Young may not be used to endorse or promote
   16  *    products derived from this software without specific prior
   17  *    written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY David Young ``AS IS'' AND ANY
   20  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   21  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
   22  * PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL David
   23  * Young BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   24  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
   25  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   27  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   28  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
   30  * OF SUCH DAMAGE.
   31  */
   32 #ifndef _NET80211_IEEE80211_RSSADAPT_H_
   33 #define _NET80211_IEEE80211_RSSADAPT_H_
   34 
   35 /* Data-rate adaptation loosely based on "Link Adaptation Strategy
   36  * for IEEE 802.11 WLAN via Received Signal Strength Measurement"
   37  * by Javier del Prado Pavon and Sunghyun Choi.
   38  */
   39 
   40 /* Buckets for frames 0-128 bytes long, 129-1024, 1025-maximum. */
   41 #define IEEE80211_RSSADAPT_BKTS         3
   42 #define IEEE80211_RSSADAPT_BKT0         128
   43 #define IEEE80211_RSSADAPT_BKTPOWER     3       /* 2**_BKTPOWER */
   44 
   45 struct ieee80211_rssadapt {
   46         struct ieee80211vap *vap;
   47         int     interval;                       /* update interval (ticks) */
   48 };
   49 
   50 struct ieee80211_rssadapt_node {
   51         struct ieee80211_rssadapt *ra_rs;       /* backpointer */
   52         struct ieee80211_rateset ra_rates;      /* negotiated rates */
   53         int     ra_rix;                         /* current rate index */
   54         int     ra_ticks;                       /* time of last update */
   55         int     ra_last_raise;                  /* time of last rate raise */
   56         int     ra_raise_interval;              /* rate raise time threshold */
   57 
   58         /* Tx failures in this update interval */
   59         uint32_t                ra_nfail;
   60         /* Tx successes in this update interval */
   61         uint32_t                ra_nok;
   62         /* exponential average packets/second */
   63         uint32_t                ra_pktrate;
   64         /* RSSI threshold for each Tx rate */
   65         uint16_t                ra_rate_thresh[IEEE80211_RSSADAPT_BKTS]
   66                                               [IEEE80211_RATE_SIZE];
   67 };
   68 
   69 void    ieee80211_rssadapt_init(struct ieee80211_rssadapt *,
   70             struct ieee80211vap *, int);
   71 void    ieee80211_rssadapt_cleanup(struct ieee80211_rssadapt *);
   72 void    ieee80211_rssadapt_setinterval(struct ieee80211_rssadapt *, int);
   73 void    ieee80211_rssadapt_node_init(struct ieee80211_rssadapt *,
   74             struct ieee80211_rssadapt_node *, struct ieee80211_node *);
   75 int     ieee80211_rssadapt_choose(struct ieee80211_node *,
   76             struct ieee80211_rssadapt_node *, u_int);
   77 
   78 /* NB: these are public only for the inline below */
   79 void    ieee80211_rssadapt_raise_rate(struct ieee80211_rssadapt_node *,
   80             int pktlen, int rssi);
   81 void    ieee80211_rssadapt_lower_rate(struct ieee80211_rssadapt_node *,
   82             int pktlen, int rssi);
   83 
   84 #define IEEE80211_RSSADAPT_SUCCESS      1
   85 #define IEEE80211_RSSADAPT_FAILURE      0
   86 
   87 static __inline void
   88 ieee80211_rssadapt_tx_complete(struct ieee80211_rssadapt_node *ra,
   89     int success, int pktlen, int rssi)
   90 {
   91         if (success) {
   92                 ra->ra_nok++;
   93                 if ((ra->ra_rix + 1) < ra->ra_rates.rs_nrates &&
   94                     (ticks - ra->ra_last_raise) >= ra->ra_raise_interval)
   95                         ieee80211_rssadapt_raise_rate(ra, pktlen, rssi);
   96         } else {
   97                 ra->ra_nfail++;
   98                 ieee80211_rssadapt_lower_rate(ra, pktlen, rssi);
   99         }
  100 }
  101 #endif /* _NET80211_IEEE80211_RSSADAPT_H_ */

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