ieee80211_amrr.c

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    1 /*      $OpenBSD: ieee80211_amrr.c,v 1.1 2006/06/17 19:07:19 damien Exp $       */
    2 
    3 /*-
    4  * Copyright (c) 2006
    5  *      Damien Bergamini <damien.bergamini@free.fr>
    6  *
    7  * Permission to use, copy, modify, and distribute this software for any
    8  * purpose with or without fee is hereby granted, provided that the above
    9  * copyright notice and this permission notice appear in all copies.
   10  *
   11  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   12  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   13  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   14  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   15  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   16  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   17  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   18  */
   19 
   20 #include <sys/cdefs.h>
   21 __FBSDID("$FreeBSD$");
   22 
   23 /*-
   24  * Naive implementation of the Adaptive Multi Rate Retry algorithm:
   25  *
   26  * "IEEE 802.11 Rate Adaptation: A Practical Approach"
   27  *  Mathieu Lacage, Hossein Manshaei, Thierry Turletti
   28  *  INRIA Sophia - Projet Planete
   29  *  http://www-sop.inria.fr/rapports/sophia/RR-5208.html
   30  */
   31 #include <sys/param.h>
   32 #include <sys/kernel.h>
   33 #include <sys/module.h>
   34 #include <sys/socket.h>
   35 #include <sys/sysctl.h>
   36 
   37 #include <net/if.h>
   38 #include <net/if_media.h>
   39 
   40 #ifdef INET
   41 #include <netinet/in.h>
   42 #include <netinet/if_ether.h>
   43 #endif
   44 
   45 #include <net80211/ieee80211_var.h>
   46 #include <net80211/ieee80211_amrr.h>
   47 
   48 #define is_success(amn) \
   49         ((amn)->amn_retrycnt < (amn)->amn_txcnt / 10)
   50 #define is_failure(amn) \
   51         ((amn)->amn_retrycnt > (amn)->amn_txcnt / 3)
   52 #define is_enough(amn)          \
   53         ((amn)->amn_txcnt > 10)
   54 #define is_min_rate(ni)         \
   55         ((ni)->ni_txrate == 0)
   56 #define is_max_rate(ni)         \
   57         ((ni)->ni_txrate == (ni)->ni_rates.rs_nrates - 1)
   58 #define increase_rate(ni)       \
   59         ((ni)->ni_txrate++)
   60 #define decrease_rate(ni)       \
   61         ((ni)->ni_txrate--)
   62 #define reset_cnt(amn)          \
   63         do { (amn)->amn_txcnt = (amn)->amn_retrycnt = 0; } while (0)
   64 
   65 void
   66 ieee80211_amrr_init(struct ieee80211_amrr *amrr,
   67     struct ieee80211com *ic, int amin, int amax)
   68 {
   69         /* XXX bounds check? */
   70         amrr->amrr_min_success_threshold = amin;
   71         amrr->amrr_max_success_threshold = amax;
   72         amrr->amrr_ic = ic;
   73 }
   74 
   75 void
   76 ieee80211_amrr_node_init(struct ieee80211_amrr *amrr,
   77     struct ieee80211_amrr_node *amn)
   78 {
   79         amn->amn_success = 0;
   80         amn->amn_recovery = 0;
   81         amn->amn_txcnt = amn->amn_retrycnt = 0;
   82         amn->amn_success_threshold = amrr->amrr_min_success_threshold;
   83 }
   84 
   85 /*
   86  * Update ni->ni_txrate.
   87  */
   88 void
   89 ieee80211_amrr_choose(struct ieee80211_amrr *amrr, struct ieee80211_node *ni,
   90     struct ieee80211_amrr_node *amn)
   91 {
   92         int need_change = 0;
   93 
   94         if (is_success(amn) && is_enough(amn)) {
   95                 amn->amn_success++;
   96                 if (amn->amn_success >= amn->amn_success_threshold &&
   97                     !is_max_rate(ni)) {
   98                         amn->amn_recovery = 1;
   99                         amn->amn_success = 0;
  100                         increase_rate(ni);
  101                         IEEE80211_DPRINTF(amrr->amrr_ic, IEEE80211_MSG_RATECTL,
  102                             "AMRR increasing rate %d (txcnt=%d "
  103                             "retrycnt=%d)\n",
  104                             ni->ni_rates.rs_rates[ni->ni_txrate] &
  105                                 IEEE80211_RATE_VAL,
  106                             amn->amn_txcnt, amn->amn_retrycnt);
  107                         need_change = 1;
  108                 } else {
  109                         amn->amn_recovery = 0;
  110                 }
  111         } else if (is_failure(amn)) {
  112                 amn->amn_success = 0;
  113                 if (!is_min_rate(ni)) {
  114                         if (amn->amn_recovery) {
  115                                 amn->amn_success_threshold *= 2;
  116                                 if (amn->amn_success_threshold >
  117                                     amrr->amrr_max_success_threshold)
  118                                         amn->amn_success_threshold =
  119                                             amrr->amrr_max_success_threshold;
  120                         } else {
  121                                 amn->amn_success_threshold =
  122                                     amrr->amrr_min_success_threshold;
  123                         }
  124                         decrease_rate(ni);
  125                         IEEE80211_DPRINTF(amrr->amrr_ic, IEEE80211_MSG_RATECTL,
  126                             "AMRR decreasing rate %d (txcnt=%d "
  127                             "retrycnt=%d)\n",
  128                             ni->ni_rates.rs_rates[ni->ni_txrate] &
  129                                 IEEE80211_RATE_VAL,
  130                             amn->amn_txcnt, amn->amn_retrycnt);
  131                         need_change = 1;
  132                 }
  133                 amn->amn_recovery = 0;
  134         }
  135 
  136         if (is_enough(amn) || need_change)
  137                 reset_cnt(amn);
  138 }
  139 
  140 /*
  141  * Module glue.
  142  */
  143 static int
  144 amrr_modevent(module_t mod, int type, void *unused)
  145 {
  146         switch (type) {
  147         case MOD_LOAD:
  148                 if (bootverbose)
  149                         printf("wlan_amrr: <AMRR Transmit Rate Control Algorithm>\n");
  150                 return 0;
  151         case MOD_UNLOAD:
  152                 return 0;
  153         }
  154         return EINVAL;
  155 }
  156 
  157 static moduledata_t amrr_mod = {
  158         "wlan_amrr",
  159         amrr_modevent,
  160         0
  161 };
  162 DECLARE_MODULE(wlan_amrr, amrr_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST);
  163 MODULE_VERSION(wlan_amrr, 1);
  164 MODULE_DEPEND(wlan_amrr, wlan, 1, 1, 1);

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FreeBSD/Linux Kernel Cross Reference sys/net80211/ieee80211_amrr.c

FreeBSD/Linux Kernel Cross Reference
sys/net80211/ieee80211_amrr.c