mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-23 01:40:30 +00:00
f0706e828e
Add mac80211, the IEEE 802.11 software MAC layer. Signed-off-by: Jiri Benc <jbenc@suse.cz> Signed-off-by: John W. Linville <linville@tuxdriver.com>
141 lines
3.2 KiB
C
141 lines
3.2 KiB
C
/*
|
|
* Copyright 2002-2005, Instant802 Networks, Inc.
|
|
* Copyright 2005-2006, Devicescape Software, Inc.
|
|
* Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include "ieee80211_rate.h"
|
|
#include "ieee80211_i.h"
|
|
|
|
struct rate_control_alg {
|
|
struct list_head list;
|
|
struct rate_control_ops *ops;
|
|
};
|
|
|
|
static LIST_HEAD(rate_ctrl_algs);
|
|
static DEFINE_MUTEX(rate_ctrl_mutex);
|
|
|
|
int ieee80211_rate_control_register(struct rate_control_ops *ops)
|
|
{
|
|
struct rate_control_alg *alg;
|
|
|
|
alg = kmalloc(sizeof(*alg), GFP_KERNEL);
|
|
if (alg == NULL) {
|
|
return -ENOMEM;
|
|
}
|
|
memset(alg, 0, sizeof(*alg));
|
|
alg->ops = ops;
|
|
|
|
mutex_lock(&rate_ctrl_mutex);
|
|
list_add_tail(&alg->list, &rate_ctrl_algs);
|
|
mutex_unlock(&rate_ctrl_mutex);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_rate_control_register);
|
|
|
|
void ieee80211_rate_control_unregister(struct rate_control_ops *ops)
|
|
{
|
|
struct rate_control_alg *alg;
|
|
|
|
mutex_lock(&rate_ctrl_mutex);
|
|
list_for_each_entry(alg, &rate_ctrl_algs, list) {
|
|
if (alg->ops == ops) {
|
|
list_del(&alg->list);
|
|
break;
|
|
}
|
|
}
|
|
mutex_unlock(&rate_ctrl_mutex);
|
|
kfree(alg);
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_rate_control_unregister);
|
|
|
|
static struct rate_control_ops *
|
|
ieee80211_try_rate_control_ops_get(const char *name)
|
|
{
|
|
struct rate_control_alg *alg;
|
|
struct rate_control_ops *ops = NULL;
|
|
|
|
mutex_lock(&rate_ctrl_mutex);
|
|
list_for_each_entry(alg, &rate_ctrl_algs, list) {
|
|
if (!name || !strcmp(alg->ops->name, name))
|
|
if (try_module_get(alg->ops->module)) {
|
|
ops = alg->ops;
|
|
break;
|
|
}
|
|
}
|
|
mutex_unlock(&rate_ctrl_mutex);
|
|
return ops;
|
|
}
|
|
|
|
/* Get the rate control algorithm. If `name' is NULL, get the first
|
|
* available algorithm. */
|
|
static struct rate_control_ops *
|
|
ieee80211_rate_control_ops_get(const char *name)
|
|
{
|
|
struct rate_control_ops *ops;
|
|
|
|
ops = ieee80211_try_rate_control_ops_get(name);
|
|
if (!ops) {
|
|
request_module("rc80211_%s", name ? name : "default");
|
|
ops = ieee80211_try_rate_control_ops_get(name);
|
|
}
|
|
return ops;
|
|
}
|
|
|
|
static void ieee80211_rate_control_ops_put(struct rate_control_ops *ops)
|
|
{
|
|
module_put(ops->module);
|
|
}
|
|
|
|
struct rate_control_ref *rate_control_alloc(const char *name,
|
|
struct ieee80211_local *local)
|
|
{
|
|
struct rate_control_ref *ref;
|
|
|
|
ref = kmalloc(sizeof(struct rate_control_ref), GFP_KERNEL);
|
|
if (!ref)
|
|
goto fail_ref;
|
|
kref_init(&ref->kref);
|
|
ref->ops = ieee80211_rate_control_ops_get(name);
|
|
if (!ref->ops)
|
|
goto fail_ops;
|
|
ref->priv = ref->ops->alloc(local);
|
|
if (!ref->priv)
|
|
goto fail_priv;
|
|
return ref;
|
|
|
|
fail_priv:
|
|
ieee80211_rate_control_ops_put(ref->ops);
|
|
fail_ops:
|
|
kfree(ref);
|
|
fail_ref:
|
|
return NULL;
|
|
}
|
|
|
|
static void rate_control_release(struct kref *kref)
|
|
{
|
|
struct rate_control_ref *ctrl_ref;
|
|
|
|
ctrl_ref = container_of(kref, struct rate_control_ref, kref);
|
|
ctrl_ref->ops->free(ctrl_ref->priv);
|
|
ieee80211_rate_control_ops_put(ctrl_ref->ops);
|
|
kfree(ctrl_ref);
|
|
}
|
|
|
|
struct rate_control_ref *rate_control_get(struct rate_control_ref *ref)
|
|
{
|
|
kref_get(&ref->kref);
|
|
return ref;
|
|
}
|
|
|
|
void rate_control_put(struct rate_control_ref *ref)
|
|
{
|
|
kref_put(&ref->kref, rate_control_release);
|
|
}
|