ieee80211_amrr.c

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    1 /*      $NetBSD: ieee80211_amrr.c,v 1.3 2015/08/24 20:58:47 pooka Exp $ */
    2 /*      $OpenBSD: ieee80211_amrr.c,v 1.1 2006/06/17 19:07:19 damien 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/cdefs.h>
   22 __KERNEL_RCSID(0, "$NetBSD: ieee80211_amrr.c,v 1.3 2015/08/24 20:58:47 pooka Exp $");
   23 
   24 #ifdef _KERNEL_OPT
   25 #include "opt_inet.h"
   26 #endif
   27 
   28 #include <sys/param.h>
   29 #include <sys/kernel.h>
   30 #include <sys/socket.h>
   31 #include <sys/sysctl.h>
   32 
   33 #include <net/if.h>
   34 #include <net/if_ether.h>
   35 #include <net/if_media.h>
   36 
   37 #ifdef INET
   38 #include <netinet/in.h>
   39 #endif
   40 
   41 #include <net80211/ieee80211.h>
   42 #include <net80211/ieee80211_var.h>
   43 #include <net80211/ieee80211_amrr.h>
   44 
   45 #define is_success(amn) \
   46         ((amn)->amn_retrycnt < (amn)->amn_txcnt / 10)
   47 #define is_failure(amn) \
   48         ((amn)->amn_retrycnt > (amn)->amn_txcnt / 3)
   49 #define is_enough(amn)          \
   50         ((amn)->amn_txcnt > 10)
   51 #define is_min_rate(ni)         \
   52         ((ni)->ni_txrate == 0)
   53 #define is_max_rate(ni)         \
   54         ((ni)->ni_txrate == (ni)->ni_rates.rs_nrates - 1)
   55 #define increase_rate(ni)       \
   56         ((ni)->ni_txrate++)
   57 #define decrease_rate(ni)       \
   58         ((ni)->ni_txrate--)
   59 #define reset_cnt(amn)          \
   60         do { (amn)->amn_txcnt = (amn)->amn_retrycnt = 0; } while (0)
   61 
   62 void
   63 ieee80211_amrr_node_init(struct ieee80211_amrr *amrr,
   64     struct ieee80211_amrr_node *amn)
   65 {
   66         amn->amn_success = 0;
   67         amn->amn_recovery = 0;
   68         amn->amn_txcnt = amn->amn_retrycnt = 0;
   69         amn->amn_success_threshold = amrr->amrr_min_success_threshold;
   70 }
   71 
   72 /*
   73  * Update ni->ni_txrate.
   74  */
   75 void
   76 ieee80211_amrr_choose(struct ieee80211_amrr *amrr, struct ieee80211_node *ni,
   77     struct ieee80211_amrr_node *amn)
   78 {
   79         int need_change = 0;
   80 
   81         if (is_success(amn) && is_enough(amn)) {
   82                 amn->amn_success++;
   83                 if (amn->amn_success >= amn->amn_success_threshold &&
   84                     !is_max_rate(ni)) {
   85                         amn->amn_recovery = 1;
   86                         amn->amn_success = 0;
   87                         increase_rate(ni);
   88                         IEEE80211_DPRINTF(ni->ni_ic, IEEE80211_MSG_DEBUG,
   89                             "AMRR increasing rate %d (txcnt=%d retrycnt=%d)\n",
   90                             ni->ni_rates.rs_rates[ni->ni_txrate] &
   91                                 IEEE80211_RATE_VAL,
   92                             amn->amn_txcnt, amn->amn_retrycnt);
   93                         need_change = 1;
   94                 } else {
   95                         amn->amn_recovery = 0;
   96                 }
   97         } else if (is_failure(amn)) {
   98                 amn->amn_success = 0;
   99                 if (!is_min_rate(ni)) {
  100                         if (amn->amn_recovery) {
  101                                 amn->amn_success_threshold *= 2;
  102                                 if (amn->amn_success_threshold >
  103                                     amrr->amrr_max_success_threshold)
  104                                         amn->amn_success_threshold =
  105                                             amrr->amrr_max_success_threshold;
  106                         } else {
  107                                 amn->amn_success_threshold =
  108                                     amrr->amrr_min_success_threshold;
  109                         }
  110                         decrease_rate(ni);
  111                         IEEE80211_DPRINTF(ni->ni_ic, IEEE80211_MSG_DEBUG,
  112                             "AMRR decreasing rate %d (txcnt=%d retrycnt=%d)\n",
  113                             ni->ni_rates.rs_rates[ni->ni_txrate] &
  114                                 IEEE80211_RATE_VAL,
  115                             amn->amn_txcnt, amn->amn_retrycnt);
  116                         need_change = 1;
  117                 }
  118                 amn->amn_recovery = 0;
  119         }
  120 
  121         if (is_enough(amn) || need_change)
  122                 reset_cnt(amn);
  123 }

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

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