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


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

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

Version: -  FREEBSD  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-2  -  FREEBSD-11-1  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-4  -  FREEBSD-10-3  -  FREEBSD-10-2  -  FREEBSD-10-1  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-3  -  FREEBSD-9-2  -  FREEBSD-9-1  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-4  -  FREEBSD-8-3  -  FREEBSD-8-2  -  FREEBSD-8-1  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-4  -  FREEBSD-7-3  -  FREEBSD-7-2  -  FREEBSD-7-1  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-4  -  FREEBSD-6-3  -  FREEBSD-6-2  -  FREEBSD-6-1  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-5  -  FREEBSD-5-4  -  FREEBSD-5-3  -  FREEBSD-5-2  -  FREEBSD-5-1  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  linux-2.6  -  linux-2.4.22  -  MK83  -  MK84  -  PLAN9  -  DFBSD  -  NETBSD  -  NETBSD5  -  NETBSD4  -  NETBSD3  -  NETBSD20  -  OPENBSD  -  xnu-517  -  xnu-792  -  xnu-792.6.70  -  xnu-1228  -  xnu-1456.1.26  -  xnu-1699.24.8  -  xnu-2050.18.24  -  OPENSOLARIS  -  minix-3-1-1 
SearchContext: -  none  -  3  -  10 

    1 /* $NetBSD: ieee80211_rssadapt.c,v 1.14 2006/08/30 15:40:41 christos 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  * 3. The name of David Young may not be used to endorse or promote
   15  *    products derived from this software without specific prior
   16  *    written permission.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY David Young ``AS IS'' AND ANY
   19  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   20  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
   21  * PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL David
   22  * Young BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   23  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
   24  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   26  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   27  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
   29  * OF SUCH DAMAGE.
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 #ifdef __NetBSD__
   34 __KERNEL_RCSID(0, "$NetBSD: ieee80211_rssadapt.c,v 1.14 2006/08/30 15:40:41 christos Exp $");
   35 #endif
   36 
   37 #include <sys/param.h>
   38 #include <sys/types.h>
   39 #include <sys/kernel.h>         /* for hz */
   40 #include <sys/sysctl.h>
   41 
   42 #include <net/if.h>
   43 #include <net/if_media.h>
   44 #include <net/if_ether.h>
   45 
   46 #include <net80211/ieee80211_netbsd.h>
   47 #include <net80211/ieee80211_var.h>
   48 #include <net80211/ieee80211.h>
   49 #include <net80211/ieee80211_rssadapt.h>
   50 
   51 #ifdef interpolate
   52 #undef interpolate
   53 #endif
   54 #define interpolate(parm, old, new) ((parm##_old * (old) + \
   55                                      (parm##_denom - parm##_old) * (new)) / \
   56                                     parm##_denom)
   57 
   58 #ifdef IEEE80211_DEBUG
   59 static  struct timeval lastrateadapt;   /* time of last rate adaptation msg */
   60 static  int currssadaptps = 0;          /* rate-adaptation msgs this second */
   61 static  int ieee80211_adaptrate = 4;    /* rate-adaptation max msgs/sec */
   62 
   63 #define RSSADAPT_DO_PRINT() \
   64         ((ieee80211_rssadapt_debug > 0) && \
   65          ppsratecheck(&lastrateadapt, &currssadaptps, ieee80211_adaptrate))
   66 #define RSSADAPT_PRINTF(X) \
   67         if (RSSADAPT_DO_PRINT()) \
   68                 printf X
   69 
   70 int ieee80211_rssadapt_debug = 0;
   71 
   72 #else
   73 #define RSSADAPT_DO_PRINT() (0)
   74 #define RSSADAPT_PRINTF(X)
   75 #endif
   76 
   77 static struct ieee80211_rssadapt_expavgctl master_expavgctl = {
   78         rc_decay_denom : 16,
   79         rc_decay_old : 15,
   80         rc_thresh_denom : 8,
   81         rc_thresh_old : 4,
   82         rc_avgrssi_denom : 8,
   83         rc_avgrssi_old : 4
   84 };
   85 
   86 #ifdef __NetBSD__
   87 #ifdef IEEE80211_DEBUG
   88 /* TBD factor with sysctl_ath_verify, sysctl_ieee80211_verify. */
   89 static int
   90 sysctl_ieee80211_rssadapt_debug(SYSCTLFN_ARGS)
   91 {
   92         int error, t;
   93         struct sysctlnode node;
   94 
   95         node = *rnode;
   96         t = *(int*)rnode->sysctl_data;
   97         node.sysctl_data = &t;
   98         error = sysctl_lookup(SYSCTLFN_CALL(&node));
   99         if (error || newp == NULL)
  100                 return (error);
  101 
  102         if (t < 0 || t > 2)
  103                 return (EINVAL);
  104         *(int*)rnode->sysctl_data = t;
  105 
  106         return (0);
  107 }
  108 #endif /* IEEE80211_DEBUG */
  109 
  110 /* TBD factor with sysctl_ath_verify, sysctl_ieee80211_verify. */
  111 static int
  112 sysctl_ieee80211_rssadapt_expavgctl(SYSCTLFN_ARGS)
  113 {
  114         struct ieee80211_rssadapt_expavgctl rc;
  115         int error;
  116         struct sysctlnode node;
  117 
  118         node = *rnode;
  119         rc = *(struct ieee80211_rssadapt_expavgctl *)rnode->sysctl_data;
  120         node.sysctl_data = &rc;
  121         error = sysctl_lookup(SYSCTLFN_CALL(&node));
  122         if (error || newp == NULL)
  123                 return (error);
  124 
  125         if (/* rc.rc_decay_old < 0 || */
  126             rc.rc_decay_denom < rc.rc_decay_old)
  127                 return (EINVAL);
  128 
  129         if (/* rc.rc_thresh_old < 0 || */
  130             rc.rc_thresh_denom < rc.rc_thresh_old)
  131                 return (EINVAL);
  132 
  133         if (/* rc.rc_avgrssi_old < 0 || */
  134             rc.rc_avgrssi_denom < rc.rc_avgrssi_old)
  135                 return (EINVAL);
  136 
  137         *(struct ieee80211_rssadapt_expavgctl *)rnode->sysctl_data = rc;
  138 
  139         return (0);
  140 }
  141 
  142 /*
  143  * Setup sysctl(3) MIB, net.ieee80211.*
  144  *
  145  * TBD condition CTLFLAG_PERMANENT on being an LKM or not
  146  */
  147 SYSCTL_SETUP(sysctl_ieee80211_rssadapt,
  148     "sysctl ieee80211 rssadapt subtree setup")
  149 {
  150         int rc;
  151         const struct sysctlnode *node;
  152 
  153         if ((rc = sysctl_createv(clog, 0, NULL, &node,
  154             CTLFLAG_PERMANENT, CTLTYPE_NODE, "net", NULL,
  155             NULL, 0, NULL, 0, CTL_NET, CTL_EOL)) != 0)
  156                 goto err;
  157 
  158         if ((rc = sysctl_createv(clog, 0, &node, &node,
  159             CTLFLAG_PERMANENT, CTLTYPE_NODE, "link", NULL,
  160             NULL, 0, NULL, 0, PF_LINK, CTL_EOL)) != 0)
  161                 goto err;
  162 
  163         if ((rc = sysctl_createv(clog, 0, &node, &node,
  164             CTLFLAG_PERMANENT, CTLTYPE_NODE, "ieee80211", NULL,
  165             NULL, 0, NULL, 0, CTL_CREATE, CTL_EOL)) != 0)
  166                 goto err;
  167 
  168         if ((rc = sysctl_createv(clog, 0, &node, &node,
  169             CTLFLAG_PERMANENT, CTLTYPE_NODE, "rssadapt",
  170             SYSCTL_DESCR("Received Signal Strength adaptation controls"),
  171             NULL, 0, NULL, 0, CTL_CREATE, CTL_EOL)) != 0)
  172                 goto err;
  173 
  174 #ifdef IEEE80211_DEBUG
  175         /* control debugging printfs */
  176         if ((rc = sysctl_createv(clog, 0, &node, NULL,
  177             CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "debug",
  178             SYSCTL_DESCR("Enable RSS adaptation debugging output"),
  179             sysctl_ieee80211_rssadapt_debug, 0, &ieee80211_rssadapt_debug, 0,
  180             CTL_CREATE, CTL_EOL)) != 0)
  181                 goto err;
  182 #endif /* IEEE80211_DEBUG */
  183 
  184         /* control rate of decay for exponential averages */
  185         if ((rc = sysctl_createv(clog, 0, &node, NULL,
  186             CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_STRUCT,
  187             "expavgctl", SYSCTL_DESCR("RSS exponential averaging control"),
  188             sysctl_ieee80211_rssadapt_expavgctl, 0,
  189             &master_expavgctl, sizeof(master_expavgctl), CTL_CREATE,
  190             CTL_EOL)) != 0)
  191                 goto err;
  192 
  193         return;
  194 err:
  195         printf("%s: sysctl_createv failed (rc = %d)\n", __func__, rc);
  196 }
  197 #endif /* __NetBSD__ */
  198 
  199 int
  200 ieee80211_rssadapt_choose(struct ieee80211_rssadapt *ra,
  201     struct ieee80211_rateset *rs, struct ieee80211_frame *wh, u_int len,
  202     int fixed_rate, const char *dvname, int do_not_adapt)
  203 {
  204         u_int16_t (*thrs)[IEEE80211_RATE_SIZE];
  205         int flags = 0, i, rateidx = 0, thridx, top;
  206 
  207         if ((wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_CTL)
  208                 flags |= IEEE80211_RATE_BASIC;
  209 
  210         for (i = 0, top = IEEE80211_RSSADAPT_BKT0;
  211              i < IEEE80211_RSSADAPT_BKTS;
  212              i++, top <<= IEEE80211_RSSADAPT_BKTPOWER) {
  213                 thridx = i;
  214                 if (len <= top)
  215                         break;
  216         }
  217 
  218         thrs = &ra->ra_rate_thresh[thridx];
  219 
  220         if (fixed_rate != -1) {
  221                 if ((rs->rs_rates[fixed_rate] & flags) == flags) {
  222                         rateidx = fixed_rate;
  223                         goto out;
  224                 }
  225                 flags |= IEEE80211_RATE_BASIC;
  226                 i = fixed_rate;
  227         } else
  228                 i = rs->rs_nrates;
  229 
  230         while (--i >= 0) {
  231                 rateidx = i;
  232                 if ((rs->rs_rates[i] & flags) != flags)
  233                         continue;
  234                 if (do_not_adapt)
  235                         break;
  236                 if ((*thrs)[i] < ra->ra_avg_rssi)
  237                         break;
  238         }
  239 
  240 out:
  241 #ifdef IEEE80211_DEBUG
  242         if (ieee80211_rssadapt_debug && dvname != NULL) {
  243                 printf("%s: dst %s threshold[%d, %d.%d] %d < %d\n",
  244                     dvname, ether_sprintf(wh->i_addr1), len,
  245                     (rs->rs_rates[rateidx] & IEEE80211_RATE_VAL) / 2,
  246                     (rs->rs_rates[rateidx] & IEEE80211_RATE_VAL) * 5 % 10,
  247                     (*thrs)[rateidx], ra->ra_avg_rssi);
  248         }
  249 #endif /* IEEE80211_DEBUG */
  250         return rateidx;
  251 }
  252 
  253 void
  254 ieee80211_rssadapt_updatestats(struct ieee80211_rssadapt *ra)
  255 {
  256         long interval; 
  257 
  258         ra->ra_pktrate =
  259             (ra->ra_pktrate + 10 * (ra->ra_nfail + ra->ra_nok)) / 2;
  260         ra->ra_nfail = ra->ra_nok = 0;
  261 
  262         /* a node is eligible for its rate to be raised every 1/10 to 10
  263          * seconds, more eligible in proportion to recent packet rates.
  264          */
  265         interval = MAX(100000, 10000000 / MAX(1, 10 * ra->ra_pktrate));
  266         ra->ra_raise_interval.tv_sec = interval / (1000 * 1000);
  267         ra->ra_raise_interval.tv_usec = interval % (1000 * 1000);
  268 }
  269 
  270 void
  271 ieee80211_rssadapt_input(struct ieee80211com *ic, struct ieee80211_node *ni,
  272     struct ieee80211_rssadapt *ra, int rssi)
  273 {
  274 #ifdef IEEE80211_DEBUG
  275         int last_avg_rssi = ra->ra_avg_rssi;
  276 #endif
  277 
  278         ra->ra_avg_rssi = interpolate(master_expavgctl.rc_avgrssi,
  279                                       ra->ra_avg_rssi, (rssi << 8));
  280 
  281         RSSADAPT_PRINTF(("%s: src %s rssi %d avg %d -> %d\n",
  282             ic->ic_ifp->if_xname, ether_sprintf(ni->ni_macaddr),
  283             rssi, last_avg_rssi, ra->ra_avg_rssi));
  284 }
  285 
  286 /*
  287  * Adapt the data rate to suit the conditions.  When a transmitted
  288  * packet is dropped after IEEE80211_RSSADAPT_RETRY_LIMIT retransmissions,
  289  * raise the RSS threshold for transmitting packets of similar length at
  290  * the same data rate.
  291  */
  292 void
  293 ieee80211_rssadapt_lower_rate(struct ieee80211com *ic,
  294     struct ieee80211_node *ni, struct ieee80211_rssadapt *ra,
  295     struct ieee80211_rssdesc *id)
  296 {
  297         struct ieee80211_rateset *rs = &ni->ni_rates;
  298         u_int16_t last_thr;
  299         u_int i, thridx, top;
  300 
  301         ra->ra_nfail++;
  302 
  303         if (id->id_rateidx >= rs->rs_nrates) {
  304                 RSSADAPT_PRINTF(("ieee80211_rssadapt_lower_rate: "
  305                     "%s rate #%d > #%d out of bounds\n",
  306                     ether_sprintf(ni->ni_macaddr), id->id_rateidx,
  307                         rs->rs_nrates - 1));
  308                 return;
  309         }
  310 
  311         for (i = 0, top = IEEE80211_RSSADAPT_BKT0;
  312              i < IEEE80211_RSSADAPT_BKTS;
  313              i++, top <<= IEEE80211_RSSADAPT_BKTPOWER) {
  314                 thridx = i;
  315                 if (id->id_len <= top)
  316                         break;
  317         }
  318 
  319         last_thr = ra->ra_rate_thresh[thridx][id->id_rateidx];
  320         ra->ra_rate_thresh[thridx][id->id_rateidx] =
  321             interpolate(master_expavgctl.rc_thresh, last_thr,
  322                         (id->id_rssi << 8));
  323 
  324         RSSADAPT_PRINTF(("%s: dst %s rssi %d threshold[%d, %d.%d] %d -> %d\n",
  325             ic->ic_ifp->if_xname, ether_sprintf(ni->ni_macaddr),
  326             id->id_rssi, id->id_len,
  327             (rs->rs_rates[id->id_rateidx] & IEEE80211_RATE_VAL) / 2,
  328             (rs->rs_rates[id->id_rateidx] & IEEE80211_RATE_VAL) * 5 % 10,
  329             last_thr, ra->ra_rate_thresh[thridx][id->id_rateidx]));
  330 }
  331 
  332 void
  333 ieee80211_rssadapt_raise_rate(struct ieee80211com *ic,
  334     struct ieee80211_rssadapt *ra, struct ieee80211_rssdesc *id)
  335 {
  336         u_int16_t (*thrs)[IEEE80211_RATE_SIZE], newthr, oldthr;
  337         struct ieee80211_node *ni = id->id_node;
  338         struct ieee80211_rateset *rs = &ni->ni_rates;
  339         int i, rate, top;
  340 #ifdef IEEE80211_DEBUG
  341         int j;
  342 #endif
  343 
  344         ra->ra_nok++;
  345 
  346         if (!ratecheck(&ra->ra_last_raise, &ra->ra_raise_interval))
  347                 return;
  348 
  349         for (i = 0, top = IEEE80211_RSSADAPT_BKT0;
  350              i < IEEE80211_RSSADAPT_BKTS;
  351              i++, top <<= IEEE80211_RSSADAPT_BKTPOWER) {
  352                 thrs = &ra->ra_rate_thresh[i];
  353                 if (id->id_len <= top)
  354                         break;
  355         }
  356 
  357         if (id->id_rateidx + 1 < rs->rs_nrates &&
  358             (*thrs)[id->id_rateidx + 1] > (*thrs)[id->id_rateidx]) {
  359                 rate = (rs->rs_rates[id->id_rateidx + 1] & IEEE80211_RATE_VAL);
  360 
  361                 RSSADAPT_PRINTF(("%s: threshold[%d, %d.%d] decay %d ",
  362                     ic->ic_ifp->if_xname,
  363                     IEEE80211_RSSADAPT_BKT0 << (IEEE80211_RSSADAPT_BKTPOWER* i),
  364                     rate / 2, rate * 5 % 10, (*thrs)[id->id_rateidx + 1]));
  365                 oldthr = (*thrs)[id->id_rateidx + 1];
  366                 if ((*thrs)[id->id_rateidx] == 0)
  367                         newthr = ra->ra_avg_rssi;
  368                 else
  369                         newthr = (*thrs)[id->id_rateidx];
  370                 (*thrs)[id->id_rateidx + 1] =
  371                     interpolate(master_expavgctl.rc_decay, oldthr, newthr);
  372 
  373                 RSSADAPT_PRINTF(("-> %d\n", (*thrs)[id->id_rateidx + 1]));
  374         }
  375 
  376 #ifdef IEEE80211_DEBUG
  377         if (RSSADAPT_DO_PRINT()) {
  378                 printf("%s: dst %s thresholds\n", ic->ic_ifp->if_xname,
  379                     ether_sprintf(ni->ni_macaddr));
  380                 for (i = 0; i < IEEE80211_RSSADAPT_BKTS; i++) {
  381                         printf("%d-byte", IEEE80211_RSSADAPT_BKT0 << (IEEE80211_RSSADAPT_BKTPOWER * i));
  382                         for (j = 0; j < rs->rs_nrates; j++) {
  383                                 rate = (rs->rs_rates[j] & IEEE80211_RATE_VAL);
  384                                 printf(", T[%d.%d] = %d", rate / 2,
  385                                     rate * 5 % 10, ra->ra_rate_thresh[i][j]);
  386                         }
  387                         printf("\n");
  388                 }
  389         }
  390 #endif /* IEEE80211_DEBUG */
  391 }

Cache object: 4b3c8ccafe1c01771df9f696206b74fd


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.