ieee80211_amrr.c

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    1 /*      $OpenBSD: ieee80211_amrr.c,v 1.1 2006/06/17 19:07:19 damien Exp $       */
    2 /*      $NetBSD: ieee80211_amrr.c,v 1.1 2006/10/31 21:53:41 joerg Exp $ */
    3 
    4 /*-
    5  * Copyright (c) 2006
    6  *      Damien Bergamini <damien.bergamini@free.fr>
    7  *
    8  * Permission to use, copy, modify, and distribute this software for any
    9  * purpose with or without fee is hereby granted, provided that the above
   10  * copyright notice and this permission notice appear in all copies.
   11  *
   12  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   13  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   14  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   15  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   16  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   17  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   18  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   19  */
   20 
   21 #include <sys/param.h>
   22 #include <sys/kernel.h>
   23 #include <sys/socket.h>
   24 #include <sys/sysctl.h>
   25 
   26 #include <net/if.h>
   27 #include <net/if_media.h>
   28 
   29 #ifdef INET
   30 #include <netinet/in.h>
   31 #include <netinet/if_ether.h>
   32 #endif
   33 
   34 #include <net80211/ieee80211.h>
   35 #include <net80211/ieee80211_var.h>
   36 #include <net80211/ieee80211_amrr.h>
   37 
   38 #define is_success(amn) \
   39         ((amn)->amn_retrycnt < (amn)->amn_txcnt / 10)
   40 #define is_failure(amn) \
   41         ((amn)->amn_retrycnt > (amn)->amn_txcnt / 3)
   42 #define is_enough(amn)          \
   43         ((amn)->amn_txcnt > 10)
   44 #define is_min_rate(ni)         \
   45         ((ni)->ni_txrate == 0)
   46 #define is_max_rate(ni)         \
   47         ((ni)->ni_txrate == (ni)->ni_rates.rs_nrates - 1)
   48 #define increase_rate(ni)       \
   49         ((ni)->ni_txrate++)
   50 #define decrease_rate(ni)       \
   51         ((ni)->ni_txrate--)
   52 #define reset_cnt(amn)          \
   53         do { (amn)->amn_txcnt = (amn)->amn_retrycnt = 0; } while (0)
   54 
   55 void
   56 ieee80211_amrr_node_init(struct ieee80211_amrr *amrr,
   57     struct ieee80211_amrr_node *amn)
   58 {
   59         amn->amn_success = 0;
   60         amn->amn_recovery = 0;
   61         amn->amn_txcnt = amn->amn_retrycnt = 0;
   62         amn->amn_success_threshold = amrr->amrr_min_success_threshold;
   63 }
   64 
   65 /*
   66  * Update ni->ni_txrate.
   67  */
   68 void
   69 ieee80211_amrr_choose(struct ieee80211_amrr *amrr, struct ieee80211_node *ni,
   70     struct ieee80211_amrr_node *amn)
   71 {
   72         int need_change = 0;
   73 
   74         if (is_success(amn) && is_enough(amn)) {
   75                 amn->amn_success++;
   76                 if (amn->amn_success >= amn->amn_success_threshold &&
   77                     !is_max_rate(ni)) {
   78                         amn->amn_recovery = 1;
   79                         amn->amn_success = 0;
   80                         increase_rate(ni);
   81                         IEEE80211_DPRINTF(ni->ni_ic, IEEE80211_MSG_DEBUG,
   82                             "AMRR increasing rate %d (txcnt=%d retrycnt=%d)\n",
   83                             ni->ni_rates.rs_rates[ni->ni_txrate] &
   84                                 IEEE80211_RATE_VAL,
   85                             amn->amn_txcnt, amn->amn_retrycnt);
   86                         need_change = 1;
   87                 } else {
   88                         amn->amn_recovery = 0;
   89                 }
   90         } else if (is_failure(amn)) {
   91                 amn->amn_success = 0;
   92                 if (!is_min_rate(ni)) {
   93                         if (amn->amn_recovery) {
   94                                 amn->amn_success_threshold *= 2;
   95                                 if (amn->amn_success_threshold >
   96                                     amrr->amrr_max_success_threshold)
   97                                         amn->amn_success_threshold =
   98                                             amrr->amrr_max_success_threshold;
   99                         } else {
  100                                 amn->amn_success_threshold =
  101                                     amrr->amrr_min_success_threshold;
  102                         }
  103                         decrease_rate(ni);
  104                         IEEE80211_DPRINTF(ni->ni_ic, IEEE80211_MSG_DEBUG,
  105                             "AMRR decreasing rate %d (txcnt=%d retrycnt=%d)\n",
  106                             ni->ni_rates.rs_rates[ni->ni_txrate] &
  107                                 IEEE80211_RATE_VAL,
  108                             amn->amn_txcnt, amn->amn_retrycnt);
  109                         need_change = 1;
  110                 }
  111                 amn->amn_recovery = 0;
  112         }
  113 
  114         if (is_enough(amn) || need_change)
  115                 reset_cnt(amn);
  116 }

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

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