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_amrr.c

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    1 /*      $OpenBSD: ieee80211_amrr.c,v 1.12 2019/02/24 09:36:28 stsp 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/param.h>
   21 #include <sys/systm.h>
   22 #include <sys/kernel.h>
   23 #include <sys/socket.h>
   24 
   25 #include <net/if.h>
   26 #include <net/if_media.h>
   27 
   28 #include <netinet/in.h>
   29 #include <netinet/if_ether.h>
   30 
   31 #include <net80211/ieee80211_var.h>
   32 #include <net80211/ieee80211_priv.h>
   33 #include <net80211/ieee80211_amrr.h>
   34 
   35 #define is_success(amn) \
   36         ((amn)->amn_retrycnt < (amn)->amn_txcnt / 10)
   37 #define is_failure(amn) \
   38         ((amn)->amn_retrycnt > (amn)->amn_txcnt / 3)
   39 #define is_enough(amn)          \
   40         ((amn)->amn_txcnt > 10)
   41 #define reset_cnt(amn)          \
   42         do { (amn)->amn_txcnt = (amn)->amn_retrycnt = 0; } while (0)
   43 
   44 static inline int
   45 is_min_rate(struct ieee80211_node *ni)
   46 {
   47         return (ni->ni_txrate == 0);
   48 }
   49 
   50 static inline int
   51 is_max_rate(struct ieee80211_node *ni)
   52 {
   53         return (ni->ni_txrate == ni->ni_rates.rs_nrates - 1);
   54 }
   55 
   56 static inline void
   57 increase_rate(struct ieee80211_node *ni)
   58 {
   59         ni->ni_txrate++;
   60 }
   61 
   62 static inline void
   63 decrease_rate(struct ieee80211_node *ni)
   64 {
   65         ni->ni_txrate--;
   66 }
   67 
   68 void
   69 ieee80211_amrr_node_init(const struct ieee80211_amrr *amrr,
   70     struct ieee80211_amrr_node *amn)
   71 {
   72         amn->amn_success = 0;
   73         amn->amn_recovery = 0;
   74         amn->amn_txcnt = amn->amn_retrycnt = 0;
   75         amn->amn_success_threshold = amrr->amrr_min_success_threshold;
   76 }
   77 
   78 /*
   79  * Update ni->ni_txrate.
   80  */
   81 void
   82 ieee80211_amrr_choose(struct ieee80211_amrr *amrr, struct ieee80211_node *ni,
   83     struct ieee80211_amrr_node *amn)
   84 {
   85 #define RV(rate)        ((rate) & IEEE80211_RATE_VAL)
   86         int need_change = 0;
   87 
   88         if (is_success(amn) && is_enough(amn)) {
   89                 amn->amn_success++;
   90                 if (amn->amn_success >= amn->amn_success_threshold &&
   91                     !is_max_rate(ni)) {
   92                         amn->amn_recovery = 1;
   93                         amn->amn_success = 0;
   94                         increase_rate(ni);
   95                         DPRINTF(("increase rate=%d,#tx=%d,#retries=%d\n",
   96                             RV(ni->ni_rates.rs_rates[ni->ni_txrate]),
   97                             amn->amn_txcnt, amn->amn_retrycnt));
   98                         need_change = 1;
   99                 } else {
  100                         amn->amn_recovery = 0;
  101                 }
  102         } else if (is_failure(amn)) {
  103                 amn->amn_success = 0;
  104                 if (!is_min_rate(ni)) {
  105                         if (amn->amn_recovery) {
  106                                 amn->amn_success_threshold *= 2;
  107                                 if (amn->amn_success_threshold >
  108                                     amrr->amrr_max_success_threshold)
  109                                         amn->amn_success_threshold =
  110                                             amrr->amrr_max_success_threshold;
  111                         } else {
  112                                 amn->amn_success_threshold =
  113                                     amrr->amrr_min_success_threshold;
  114                         }
  115                         decrease_rate(ni);
  116                         DPRINTF(("decrease rate=%d,#tx=%d,#retries=%d\n",
  117                             RV(ni->ni_rates.rs_rates[ni->ni_txrate]),
  118                             amn->amn_txcnt, amn->amn_retrycnt));
  119                         need_change = 1;
  120                 }
  121                 amn->amn_recovery = 0;
  122         }
  123 
  124         if (is_enough(amn) || need_change)
  125                 reset_cnt(amn);
  126 #undef RV
  127 }

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