if_ralrate.c

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    1 /*      $FreeBSD: releng/6.0/sys/dev/ral/if_ralrate.c 145247 2005-04-18 18:47:38Z damien $      */
    2 /* $NetBSD: ieee80211_rssadapt.c,v 1.9 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 #include <sys/param.h>
   34 #include <sys/sockio.h>
   35 #include <sys/mbuf.h>
   36 #include <sys/kernel.h>
   37 #include <sys/socket.h>
   38 
   39 #include <net/if.h>
   40 #include <net/if_arp.h>
   41 #include <net/ethernet.h>
   42 #include <net/if_dl.h>
   43 #include <net/if_media.h>
   44 #include <net/if_types.h>
   45 
   46 #include <net80211/ieee80211_var.h>
   47 
   48 #include <dev/ral/if_ralrate.h>
   49 
   50 #ifdef interpolate
   51 #undef interpolate
   52 #endif
   53 #define interpolate(parm, old, new) ((parm##_old * (old) + \
   54                                      (parm##_denom - parm##_old) * (new)) / \
   55                                     parm##_denom)
   56 
   57 static struct ral_rssadapt_expavgctl master_expavgctl = {
   58         rc_decay_denom : 16,
   59         rc_decay_old : 15,
   60         rc_thresh_denom : 8,
   61         rc_thresh_old : 4,
   62         rc_avgrssi_denom : 8,
   63         rc_avgrssi_old : 4
   64 };
   65 
   66 int
   67 ral_rssadapt_choose(struct ral_rssadapt *ra, struct ieee80211_rateset *rs,
   68     struct ieee80211_frame *wh, u_int len, const char *dvname, int do_not_adapt)
   69 {
   70         u_int16_t (*thrs)[IEEE80211_RATE_SIZE];
   71         int flags = 0, i, rateidx = 0, thridx, top;
   72 
   73         if ((wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_CTL)
   74                 flags |= IEEE80211_RATE_BASIC;
   75 
   76         for (i = 0, top = RAL_RSSADAPT_BKT0;
   77              i < RAL_RSSADAPT_BKTS;
   78              i++, top <<= RAL_RSSADAPT_BKTPOWER) {
   79                 thridx = i;
   80                 if (len <= top)
   81                         break;
   82         }
   83 
   84         thrs = &ra->ra_rate_thresh[thridx];
   85 
   86         i = rs->rs_nrates;
   87         while (--i >= 0) {
   88                 rateidx = i;
   89                 if ((rs->rs_rates[i] & flags) != flags)
   90                         continue;
   91                 if (do_not_adapt)
   92                         break;
   93                 if ((*thrs)[i] < ra->ra_avg_rssi)
   94                         break;
   95         }
   96 
   97         return rateidx;
   98 }
   99 
  100 void
  101 ral_rssadapt_updatestats(struct ral_rssadapt *ra)
  102 {
  103         long interval;
  104 
  105         ra->ra_pktrate =
  106             (ra->ra_pktrate + 10 * (ra->ra_nfail + ra->ra_nok)) / 2;
  107         ra->ra_nfail = ra->ra_nok = 0;
  108 
  109         /* a node is eligible for its rate to be raised every 1/10 to 10
  110          * seconds, more eligible in proportion to recent packet rates.
  111          */
  112         interval = MAX(100000, 10000000 / MAX(1, 10 * ra->ra_pktrate));
  113         ra->ra_raise_interval.tv_sec = interval / (1000 * 1000);
  114         ra->ra_raise_interval.tv_usec = interval % (1000 * 1000);
  115 }
  116 
  117 void
  118 ral_rssadapt_input(struct ieee80211com *ic, struct ieee80211_node *ni,
  119     struct ral_rssadapt *ra, int rssi)
  120 {
  121         ra->ra_avg_rssi = interpolate(master_expavgctl.rc_avgrssi,
  122                                       ra->ra_avg_rssi, (rssi << 8));
  123 }
  124 
  125 /*
  126  * Adapt the data rate to suit the conditions.  When a transmitted
  127  * packet is dropped after RAL_RSSADAPT_RETRY_LIMIT retransmissions,
  128  * raise the RSS threshold for transmitting packets of similar length at
  129  * the same data rate.
  130  */
  131 void
  132 ral_rssadapt_lower_rate(struct ieee80211com *ic, struct ieee80211_node *ni,
  133     struct ral_rssadapt *ra, struct ral_rssdesc *id)
  134 {
  135         struct ieee80211_rateset *rs = &ni->ni_rates;
  136         u_int16_t last_thr;
  137         u_int i, thridx, top;
  138 
  139         ra->ra_nfail++;
  140 
  141         if (id->id_rateidx >= rs->rs_nrates)
  142                 return;
  143 
  144         for (i = 0, top = RAL_RSSADAPT_BKT0;
  145              i < RAL_RSSADAPT_BKTS;
  146              i++, top <<= RAL_RSSADAPT_BKTPOWER) {
  147                 thridx = i;
  148                 if (id->id_len <= top)
  149                         break;
  150         }
  151 
  152         last_thr = ra->ra_rate_thresh[thridx][id->id_rateidx];
  153         ra->ra_rate_thresh[thridx][id->id_rateidx] =
  154             interpolate(master_expavgctl.rc_thresh, last_thr,
  155                         (id->id_rssi << 8));
  156 }
  157 
  158 void
  159 ral_rssadapt_raise_rate(struct ieee80211com *ic, struct ral_rssadapt *ra,
  160     struct ral_rssdesc *id)
  161 {
  162         u_int16_t (*thrs)[IEEE80211_RATE_SIZE], newthr, oldthr;
  163         struct ieee80211_node *ni = id->id_node;
  164         struct ieee80211_rateset *rs = &ni->ni_rates;
  165         int i, rate, top;
  166 
  167         ra->ra_nok++;
  168 
  169         if (!ratecheck(&ra->ra_last_raise, &ra->ra_raise_interval))
  170                 return;
  171 
  172         for (i = 0, top = RAL_RSSADAPT_BKT0;
  173              i < RAL_RSSADAPT_BKTS;
  174              i++, top <<= RAL_RSSADAPT_BKTPOWER) {
  175                 thrs = &ra->ra_rate_thresh[i];
  176                 if (id->id_len <= top)
  177                         break;
  178         }
  179 
  180         if (id->id_rateidx + 1 < rs->rs_nrates &&
  181             (*thrs)[id->id_rateidx + 1] > (*thrs)[id->id_rateidx]) {
  182                 rate = (rs->rs_rates[id->id_rateidx + 1] & IEEE80211_RATE_VAL);
  183 
  184                 oldthr = (*thrs)[id->id_rateidx + 1];
  185                 if ((*thrs)[id->id_rateidx] == 0)
  186                         newthr = ra->ra_avg_rssi;
  187                 else
  188                         newthr = (*thrs)[id->id_rateidx];
  189                 (*thrs)[id->id_rateidx + 1] =
  190                     interpolate(master_expavgctl.rc_decay, oldthr, newthr);
  191         }
  192 }

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FreeBSD/Linux Kernel Cross Reference sys/dev/ral/if_ralrate.c

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sys/dev/ral/if_ralrate.c