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.c

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    1 /* $NetBSD: ieee80211_rssadapt.c,v 1.17 2009/10/19 23:19:39 rmind Exp $ */
    2 /*-
    3  * Copyright (c) 2003, 2004 David Young.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or
    6  * without modification, are permitted provided that the following
    7  * conditions are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above
   11  *    copyright notice, this list of conditions and the following
   12  *    disclaimer in the documentation and/or other materials provided
   13  *    with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY David Young ``AS IS'' AND ANY
   16  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   17  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
   18  * PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL David
   19  * Young BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   20  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
   21  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   23  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
   26  * OF SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 #ifdef __NetBSD__
   31 __KERNEL_RCSID(0, "$NetBSD: ieee80211_rssadapt.c,v 1.17 2009/10/19 23:19:39 rmind Exp $");
   32 #endif
   33 
   34 #include <sys/param.h>
   35 #include <sys/types.h>
   36 #include <sys/kernel.h>         /* for hz */
   37 #include <sys/sysctl.h>
   38 
   39 #include <net/if.h>
   40 #include <net/if_media.h>
   41 #include <net/if_ether.h>
   42 
   43 #include <net80211/ieee80211_netbsd.h>
   44 #include <net80211/ieee80211_var.h>
   45 #include <net80211/ieee80211.h>
   46 #include <net80211/ieee80211_rssadapt.h>
   47 
   48 #ifdef interpolate
   49 #undef interpolate
   50 #endif
   51 #define interpolate(parm, old, new) ((parm##_old * (old) + \
   52                                      (parm##_denom - parm##_old) * (new)) / \
   53                                     parm##_denom)
   54 
   55 #ifdef IEEE80211_DEBUG
   56 static  struct timeval lastrateadapt;   /* time of last rate adaptation msg */
   57 static  int currssadaptps = 0;          /* rate-adaptation msgs this second */
   58 static  int ieee80211_adaptrate = 4;    /* rate-adaptation max msgs/sec */
   59 
   60 #define RSSADAPT_DO_PRINT() \
   61         ((ieee80211_rssadapt_debug > 0) && \
   62          ppsratecheck(&lastrateadapt, &currssadaptps, ieee80211_adaptrate))
   63 #define RSSADAPT_PRINTF(X) \
   64         if (RSSADAPT_DO_PRINT()) \
   65                 printf X
   66 
   67 int ieee80211_rssadapt_debug = 0;
   68 
   69 #else
   70 #define RSSADAPT_DO_PRINT() (0)
   71 #define RSSADAPT_PRINTF(X)
   72 #endif
   73 
   74 static struct ieee80211_rssadapt_expavgctl master_expavgctl = {
   75         .rc_decay_denom = 16,
   76         .rc_decay_old = 15,
   77         .rc_thresh_denom = 8,
   78         .rc_thresh_old = 4,
   79         .rc_avgrssi_denom = 8,
   80         .rc_avgrssi_old = 4
   81 };
   82 
   83 #ifdef __NetBSD__
   84 #ifdef IEEE80211_DEBUG
   85 /* TBD factor with sysctl_ath_verify, sysctl_ieee80211_verify. */
   86 static int
   87 sysctl_ieee80211_rssadapt_debug(SYSCTLFN_ARGS)
   88 {
   89         int error, t;
   90         struct sysctlnode node;
   91 
   92         node = *rnode;
   93         t = *(int*)rnode->sysctl_data;
   94         node.sysctl_data = &t;
   95         error = sysctl_lookup(SYSCTLFN_CALL(&node));
   96         if (error || newp == NULL)
   97                 return (error);
   98 
   99         if (t < 0 || t > 2)
  100                 return (EINVAL);
  101         *(int*)rnode->sysctl_data = t;
  102 
  103         return (0);
  104 }
  105 #endif /* IEEE80211_DEBUG */
  106 
  107 /* TBD factor with sysctl_ath_verify, sysctl_ieee80211_verify. */
  108 static int
  109 sysctl_ieee80211_rssadapt_expavgctl(SYSCTLFN_ARGS)
  110 {
  111         struct ieee80211_rssadapt_expavgctl rc;
  112         int error;
  113         struct sysctlnode node;
  114 
  115         node = *rnode;
  116         rc = *(struct ieee80211_rssadapt_expavgctl *)rnode->sysctl_data;
  117         node.sysctl_data = &rc;
  118         error = sysctl_lookup(SYSCTLFN_CALL(&node));
  119         if (error || newp == NULL)
  120                 return (error);
  121 
  122         if (/* rc.rc_decay_old < 0 || */
  123             rc.rc_decay_denom < rc.rc_decay_old)
  124                 return (EINVAL);
  125 
  126         if (/* rc.rc_thresh_old < 0 || */
  127             rc.rc_thresh_denom < rc.rc_thresh_old)
  128                 return (EINVAL);
  129 
  130         if (/* rc.rc_avgrssi_old < 0 || */
  131             rc.rc_avgrssi_denom < rc.rc_avgrssi_old)
  132                 return (EINVAL);
  133 
  134         *(struct ieee80211_rssadapt_expavgctl *)rnode->sysctl_data = rc;
  135 
  136         return (0);
  137 }
  138 
  139 /*
  140  * Setup sysctl(3) MIB, net.ieee80211.*
  141  *
  142  * TBD condition CTLFLAG_PERMANENT on being a module or not
  143  */
  144 SYSCTL_SETUP(sysctl_ieee80211_rssadapt,
  145     "sysctl ieee80211 rssadapt subtree setup")
  146 {
  147         int rc;
  148         const struct sysctlnode *node;
  149 
  150         if ((rc = sysctl_createv(clog, 0, NULL, &node,
  151             CTLFLAG_PERMANENT, CTLTYPE_NODE, "net", NULL,
  152             NULL, 0, NULL, 0, CTL_NET, CTL_EOL)) != 0)
  153                 goto err;
  154 
  155         if ((rc = sysctl_createv(clog, 0, &node, &node,
  156             CTLFLAG_PERMANENT, CTLTYPE_NODE, "link", NULL,
  157             NULL, 0, NULL, 0, PF_LINK, CTL_EOL)) != 0)
  158                 goto err;
  159 
  160         if ((rc = sysctl_createv(clog, 0, &node, &node,
  161             CTLFLAG_PERMANENT, CTLTYPE_NODE, "ieee80211", NULL,
  162             NULL, 0, NULL, 0, CTL_CREATE, CTL_EOL)) != 0)
  163                 goto err;
  164 
  165         if ((rc = sysctl_createv(clog, 0, &node, &node,
  166             CTLFLAG_PERMANENT, CTLTYPE_NODE, "rssadapt",
  167             SYSCTL_DESCR("Received Signal Strength adaptation controls"),
  168             NULL, 0, NULL, 0, CTL_CREATE, CTL_EOL)) != 0)
  169                 goto err;
  170 
  171 #ifdef IEEE80211_DEBUG
  172         /* control debugging printfs */
  173         if ((rc = sysctl_createv(clog, 0, &node, NULL,
  174             CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "debug",
  175             SYSCTL_DESCR("Enable RSS adaptation debugging output"),
  176             sysctl_ieee80211_rssadapt_debug, 0, &ieee80211_rssadapt_debug, 0,
  177             CTL_CREATE, CTL_EOL)) != 0)
  178                 goto err;
  179 #endif /* IEEE80211_DEBUG */
  180 
  181         /* control rate of decay for exponential averages */
  182         if ((rc = sysctl_createv(clog, 0, &node, NULL,
  183             CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_STRUCT,
  184             "expavgctl", SYSCTL_DESCR("RSS exponential averaging control"),
  185             sysctl_ieee80211_rssadapt_expavgctl, 0,
  186             &master_expavgctl, sizeof(master_expavgctl), CTL_CREATE,
  187             CTL_EOL)) != 0)
  188                 goto err;
  189 
  190         return;
  191 err:
  192         printf("%s: sysctl_createv failed (rc = %d)\n", __func__, rc);
  193 }
  194 #endif /* __NetBSD__ */
  195 
  196 int
  197 ieee80211_rssadapt_choose(struct ieee80211_rssadapt *ra,
  198     struct ieee80211_rateset *rs, struct ieee80211_frame *wh, u_int len,
  199     int fixed_rate, const char *dvname, int do_not_adapt)
  200 {
  201         u_int16_t (*thrs)[IEEE80211_RATE_SIZE];
  202         int flags = 0, i, rateidx = 0, thridx, top;
  203 
  204         if ((wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_CTL)
  205                 flags |= IEEE80211_RATE_BASIC;
  206 
  207         for (i = 0, top = IEEE80211_RSSADAPT_BKT0;
  208              i < IEEE80211_RSSADAPT_BKTS;
  209              i++, top <<= IEEE80211_RSSADAPT_BKTPOWER) {
  210                 thridx = i;
  211                 if (len <= top)
  212                         break;
  213         }
  214 
  215         thrs = &ra->ra_rate_thresh[thridx];
  216 
  217         if (fixed_rate != -1) {
  218                 if ((rs->rs_rates[fixed_rate] & flags) == flags) {
  219                         rateidx = fixed_rate;
  220                         goto out;
  221                 }
  222                 flags |= IEEE80211_RATE_BASIC;
  223                 i = fixed_rate;
  224         } else
  225                 i = rs->rs_nrates;
  226 
  227         while (--i >= 0) {
  228                 rateidx = i;
  229                 if ((rs->rs_rates[i] & flags) != flags)
  230                         continue;
  231                 if (do_not_adapt)
  232                         break;
  233                 if ((*thrs)[i] < ra->ra_avg_rssi)
  234                         break;
  235         }
  236 
  237 out:
  238 #ifdef IEEE80211_DEBUG
  239         if (ieee80211_rssadapt_debug && dvname != NULL) {
  240                 printf("%s: dst %s threshold[%d, %d.%d] %d < %d\n",
  241                     dvname, ether_sprintf(wh->i_addr1), len,
  242                     (rs->rs_rates[rateidx] & IEEE80211_RATE_VAL) / 2,
  243                     (rs->rs_rates[rateidx] & IEEE80211_RATE_VAL) * 5 % 10,
  244                     (*thrs)[rateidx], ra->ra_avg_rssi);
  245         }
  246 #endif /* IEEE80211_DEBUG */
  247         return rateidx;
  248 }
  249 
  250 void
  251 ieee80211_rssadapt_updatestats(struct ieee80211_rssadapt *ra)
  252 {
  253         long interval; 
  254 
  255         ra->ra_pktrate =
  256             (ra->ra_pktrate + 10 * (ra->ra_nfail + ra->ra_nok)) / 2;
  257         ra->ra_nfail = ra->ra_nok = 0;
  258 
  259         /* a node is eligible for its rate to be raised every 1/10 to 10
  260          * seconds, more eligible in proportion to recent packet rates.
  261          */
  262         interval = MAX(100000, 10000000 / MAX(1, 10 * ra->ra_pktrate));
  263         ra->ra_raise_interval.tv_sec = interval / (1000 * 1000);
  264         ra->ra_raise_interval.tv_usec = interval % (1000 * 1000);
  265 }
  266 
  267 void
  268 ieee80211_rssadapt_input(struct ieee80211com *ic, struct ieee80211_node *ni,
  269     struct ieee80211_rssadapt *ra, int rssi)
  270 {
  271 #ifdef IEEE80211_DEBUG
  272         int last_avg_rssi = ra->ra_avg_rssi;
  273 #endif
  274 
  275         ra->ra_avg_rssi = interpolate(master_expavgctl.rc_avgrssi,
  276                                       ra->ra_avg_rssi, (rssi << 8));
  277 
  278         RSSADAPT_PRINTF(("%s: src %s rssi %d avg %d -> %d\n",
  279             ic->ic_ifp->if_xname, ether_sprintf(ni->ni_macaddr),
  280             rssi, last_avg_rssi, ra->ra_avg_rssi));
  281 }
  282 
  283 /*
  284  * Adapt the data rate to suit the conditions.  When a transmitted
  285  * packet is dropped after IEEE80211_RSSADAPT_RETRY_LIMIT retransmissions,
  286  * raise the RSS threshold for transmitting packets of similar length at
  287  * the same data rate.
  288  */
  289 void
  290 ieee80211_rssadapt_lower_rate(struct ieee80211com *ic,
  291     struct ieee80211_node *ni, struct ieee80211_rssadapt *ra,
  292     struct ieee80211_rssdesc *id)
  293 {
  294         struct ieee80211_rateset *rs = &ni->ni_rates;
  295         u_int16_t last_thr;
  296         u_int i, thridx, top;
  297 
  298         ra->ra_nfail++;
  299 
  300         if (id->id_rateidx >= rs->rs_nrates) {
  301                 RSSADAPT_PRINTF(("ieee80211_rssadapt_lower_rate: "
  302                     "%s rate #%d > #%d out of bounds\n",
  303                     ether_sprintf(ni->ni_macaddr), id->id_rateidx,
  304                         rs->rs_nrates - 1));
  305                 return;
  306         }
  307 
  308         for (i = 0, top = IEEE80211_RSSADAPT_BKT0;
  309              i < IEEE80211_RSSADAPT_BKTS;
  310              i++, top <<= IEEE80211_RSSADAPT_BKTPOWER) {
  311                 thridx = i;
  312                 if (id->id_len <= top)
  313                         break;
  314         }
  315 
  316         last_thr = ra->ra_rate_thresh[thridx][id->id_rateidx];
  317         ra->ra_rate_thresh[thridx][id->id_rateidx] =
  318             interpolate(master_expavgctl.rc_thresh, last_thr,
  319                         (id->id_rssi << 8));
  320 
  321         RSSADAPT_PRINTF(("%s: dst %s rssi %d threshold[%d, %d.%d] %d -> %d\n",
  322             ic->ic_ifp->if_xname, ether_sprintf(ni->ni_macaddr),
  323             id->id_rssi, id->id_len,
  324             (rs->rs_rates[id->id_rateidx] & IEEE80211_RATE_VAL) / 2,
  325             (rs->rs_rates[id->id_rateidx] & IEEE80211_RATE_VAL) * 5 % 10,
  326             last_thr, ra->ra_rate_thresh[thridx][id->id_rateidx]));
  327 }
  328 
  329 void
  330 ieee80211_rssadapt_raise_rate(struct ieee80211com *ic,
  331     struct ieee80211_rssadapt *ra, struct ieee80211_rssdesc *id)
  332 {
  333         u_int16_t (*thrs)[IEEE80211_RATE_SIZE], newthr, oldthr;
  334         struct ieee80211_node *ni = id->id_node;
  335         struct ieee80211_rateset *rs = &ni->ni_rates;
  336         int i, rate, top;
  337 #ifdef IEEE80211_DEBUG
  338         int j;
  339 #endif
  340 
  341         ra->ra_nok++;
  342 
  343         if (!ratecheck(&ra->ra_last_raise, &ra->ra_raise_interval))
  344                 return;
  345 
  346         for (i = 0, top = IEEE80211_RSSADAPT_BKT0;
  347              i < IEEE80211_RSSADAPT_BKTS;
  348              i++, top <<= IEEE80211_RSSADAPT_BKTPOWER) {
  349                 thrs = &ra->ra_rate_thresh[i];
  350                 if (id->id_len <= top)
  351                         break;
  352         }
  353 
  354         if (id->id_rateidx + 1 < rs->rs_nrates &&
  355             (*thrs)[id->id_rateidx + 1] > (*thrs)[id->id_rateidx]) {
  356                 rate = (rs->rs_rates[id->id_rateidx + 1] & IEEE80211_RATE_VAL);
  357 
  358                 RSSADAPT_PRINTF(("%s: threshold[%d, %d.%d] decay %d ",
  359                     ic->ic_ifp->if_xname,
  360                     IEEE80211_RSSADAPT_BKT0 << (IEEE80211_RSSADAPT_BKTPOWER* i),
  361                     rate / 2, rate * 5 % 10, (*thrs)[id->id_rateidx + 1]));
  362                 oldthr = (*thrs)[id->id_rateidx + 1];
  363                 if ((*thrs)[id->id_rateidx] == 0)
  364                         newthr = ra->ra_avg_rssi;
  365                 else
  366                         newthr = (*thrs)[id->id_rateidx];
  367                 (*thrs)[id->id_rateidx + 1] =
  368                     interpolate(master_expavgctl.rc_decay, oldthr, newthr);
  369 
  370                 RSSADAPT_PRINTF(("-> %d\n", (*thrs)[id->id_rateidx + 1]));
  371         }
  372 
  373 #ifdef IEEE80211_DEBUG
  374         if (RSSADAPT_DO_PRINT()) {
  375                 printf("%s: dst %s thresholds\n", ic->ic_ifp->if_xname,
  376                     ether_sprintf(ni->ni_macaddr));
  377                 for (i = 0; i < IEEE80211_RSSADAPT_BKTS; i++) {
  378                         printf("%d-byte", IEEE80211_RSSADAPT_BKT0 << (IEEE80211_RSSADAPT_BKTPOWER * i));
  379                         for (j = 0; j < rs->rs_nrates; j++) {
  380                                 rate = (rs->rs_rates[j] & IEEE80211_RATE_VAL);
  381                                 printf(", T[%d.%d] = %d", rate / 2,
  382                                     rate * 5 % 10, ra->ra_rate_thresh[i][j]);
  383                         }
  384                         printf("\n");
  385                 }
  386         }
  387 #endif /* IEEE80211_DEBUG */
  388 }

Cache object: 81c17de7c1447a8162ba87fde658960a


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