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_ratectl.c

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    1 /*-
    2  * Copyright (c) 2010 Rui Paulo <rpaulo@FreeBSD.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * 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 copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   17  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   24  */
   25 
   26 #include <sys/cdefs.h>
   27 __FBSDID("$FreeBSD: releng/9.0/sys/net80211/ieee80211_ratectl.c 214894 2010-11-06 18:17:20Z bschmidt $");
   28 
   29 #include <sys/param.h>
   30 #include <sys/kernel.h>
   31 #include <sys/systm.h>
   32 #include <sys/socket.h>
   33 
   34 #include <net/if.h>
   35 #include <net/if_media.h>
   36 
   37 #include <net80211/ieee80211_var.h>
   38 #include <net80211/ieee80211_ratectl.h>
   39 
   40 static const struct ieee80211_ratectl *ratectls[IEEE80211_RATECTL_MAX];
   41 
   42 static const char *ratectl_modnames[IEEE80211_RATECTL_MAX] = {
   43         [IEEE80211_RATECTL_AMRR]        = "wlan_amrr",
   44         [IEEE80211_RATECTL_RSSADAPT]    = "wlan_rssadapt",
   45         [IEEE80211_RATECTL_ONOE]        = "wlan_onoe",
   46         [IEEE80211_RATECTL_SAMPLE]      = "wlan_sample",
   47         [IEEE80211_RATECTL_NONE]        = "wlan_none",
   48 };
   49 
   50 MALLOC_DEFINE(M_80211_RATECTL, "80211ratectl", "802.11 rate control");
   51 
   52 void
   53 ieee80211_ratectl_register(int type, const struct ieee80211_ratectl *ratectl)
   54 {
   55         if (type >= IEEE80211_RATECTL_MAX)
   56                 return;
   57         ratectls[type] = ratectl;
   58 }
   59 
   60 void
   61 ieee80211_ratectl_unregister(int type)
   62 {
   63         if (type >= IEEE80211_RATECTL_MAX)
   64                 return;
   65         ratectls[type] = NULL;
   66 }
   67 
   68 void
   69 ieee80211_ratectl_init(struct ieee80211vap *vap)
   70 {
   71         if (vap->iv_rate == ratectls[IEEE80211_RATECTL_NONE])
   72                 ieee80211_ratectl_set(vap, IEEE80211_RATECTL_AMRR);
   73         vap->iv_rate->ir_init(vap);
   74 }
   75 
   76 void
   77 ieee80211_ratectl_set(struct ieee80211vap *vap, int type)
   78 {
   79         if (type >= IEEE80211_RATECTL_MAX)
   80                 return;
   81         if (ratectls[type] == NULL) {
   82                 ieee80211_load_module(ratectl_modnames[type]);
   83                 if (ratectls[type] == NULL) {
   84                         IEEE80211_DPRINTF(vap, IEEE80211_MSG_RATECTL,
   85                             "%s: unable to load algo %u, module %s\n",
   86                             __func__, type, ratectl_modnames[type]);
   87                         vap->iv_rate = ratectls[IEEE80211_RATECTL_NONE];
   88                         return;
   89                 }
   90         }
   91         vap->iv_rate = ratectls[type];
   92 }

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