ieee80211_ratectl.c revision 214069 
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: head/sys/net80211/ieee80211_ratectl.c 214069 2010-10-19 18:49:26Z 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
40static const struct ieee80211_ratectl *ratectls[IEEE80211_RATECTL_MAX];
41
42static 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
50MALLOC_DEFINE(M_80211_RATECTL, "80211ratectl", "802.11 rate control");
51
52void
53ieee80211_ratectl_register(int type, const struct ieee80211_ratectl *ratectl)
54{
55	if (type >= IEEE80211_RATECTL_MAX)
56		return;
57	ratectls[type] = ratectl;
58}
59
60void
61ieee80211_ratectl_unregister(int type)
62{
63	if (type >= IEEE80211_RATECTL_MAX)
64		return;
65	ratectls[type] = NULL;
66}
67
68void
69ieee80211_ratectl_set(struct ieee80211vap *vap, int type)
70{
71	if (type >= IEEE80211_RATECTL_MAX)
72		return;
73	if (ratectls[type] == NULL) {
74		ieee80211_load_module(ratectl_modnames[type]);
75		if (ratectls[type] == NULL) {
76			IEEE80211_DPRINTF(vap, IEEE80211_MSG_RATECTL,
77			    "%s: unable to load algo %u, module %s\n",
78			    __func__, type, ratectl_modnames[type]);
79			vap->iv_rate = ratectls[IEEE80211_RATECTL_NONE];
80			return;
81		}
82	}
83	vap->iv_rate = ratectls[type];
84}
85