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/dev/ral/if_ralrate.h

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    1 /*      $FreeBSD: releng/6.0/sys/dev/ral/if_ralrate.h 145247 2005-04-18 18:47:38Z damien $      */
    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 
   33 /* Data-rate adaptation loosely based on "Link Adaptation Strategy
   34  * for IEEE 802.11 WLAN via Received Signal Strength Measurement"
   35  * by Javier del Prado Pavon and Sunghyun Choi.
   36  */
   37 
   38 /* Buckets for frames 0-128 bytes long, 129-1024, 1025-maximum. */
   39 #define RAL_RSSADAPT_BKTS               3
   40 #define RAL_RSSADAPT_BKT0               128
   41 #define RAL_RSSADAPT_BKTPOWER   3       /* 2**_BKTPOWER */
   42 
   43 #define ral_rssadapt_thresh_new \
   44     (ral_rssadapt_thresh_denom - ral_rssadapt_thresh_old)
   45 #define ral_rssadapt_decay_new \
   46     (ral_rssadapt_decay_denom - ral_rssadapt_decay_old)
   47 #define ral_rssadapt_avgrssi_new \
   48     (ral_rssadapt_avgrssi_denom - ral_rssadapt_avgrssi_old)
   49 
   50 struct ral_rssadapt_expavgctl {
   51         /* RSS threshold decay. */
   52         u_int rc_decay_denom;
   53         u_int rc_decay_old;
   54         /* RSS threshold update. */
   55         u_int rc_thresh_denom;
   56         u_int rc_thresh_old;
   57         /* RSS average update. */
   58         u_int rc_avgrssi_denom;
   59         u_int rc_avgrssi_old;
   60 };
   61 
   62 struct ral_rssadapt {
   63         /* exponential average RSSI << 8 */
   64         u_int16_t               ra_avg_rssi;
   65         /* Tx failures in this update interval */
   66         u_int32_t               ra_nfail;
   67         /* Tx successes in this update interval */
   68         u_int32_t               ra_nok;
   69         /* exponential average packets/second */
   70         u_int32_t               ra_pktrate;
   71         /* RSSI threshold for each Tx rate */
   72         u_int16_t               ra_rate_thresh[RAL_RSSADAPT_BKTS]
   73                                               [IEEE80211_RATE_SIZE];
   74         struct timeval          ra_last_raise;
   75         struct timeval          ra_raise_interval;
   76 };
   77 
   78 /* Properties of a Tx packet, for link adaptation. */
   79 struct ral_rssdesc {
   80         u_int                    id_len;        /* Tx packet length */
   81         u_int                    id_rateidx;    /* index into ni->ni_rates */
   82         struct ieee80211_node   *id_node;       /* destination STA MAC */
   83         u_int8_t                 id_rssi;       /* destination STA avg RSS @
   84                                                  * Tx time
   85                                                  */
   86 };
   87 
   88 void    ral_rssadapt_updatestats(struct ral_rssadapt *);
   89 void    ral_rssadapt_input(struct ieee80211com *, struct ieee80211_node *,
   90             struct ral_rssadapt *, int);
   91 void    ral_rssadapt_lower_rate(struct ieee80211com *,
   92             struct ieee80211_node *, struct ral_rssadapt *,
   93             struct ral_rssdesc *);
   94 void    ral_rssadapt_raise_rate(struct ieee80211com *,
   95             struct ral_rssadapt *, struct ral_rssdesc *);
   96 int     ral_rssadapt_choose(struct ral_rssadapt *,
   97             struct ieee80211_rateset *, struct ieee80211_frame *, u_int,
   98             const char *, int);

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