295 lines
7.0 KiB
C
295 lines
7.0 KiB
C
/*
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* Copyright 2002-2005, Instant802 Networks, Inc.
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* Copyright 2005-2006, Devicescape Software, Inc.
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* Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/rtnetlink.h>
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#include "rate.h"
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#include "ieee80211_i.h"
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#include "debugfs.h"
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struct rate_control_alg {
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struct list_head list;
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struct rate_control_ops *ops;
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};
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static LIST_HEAD(rate_ctrl_algs);
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static DEFINE_MUTEX(rate_ctrl_mutex);
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static char *ieee80211_default_rc_algo = CONFIG_MAC80211_RC_DEFAULT;
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module_param(ieee80211_default_rc_algo, charp, 0644);
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MODULE_PARM_DESC(ieee80211_default_rc_algo,
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"Default rate control algorithm for mac80211 to use");
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int ieee80211_rate_control_register(struct rate_control_ops *ops)
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{
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struct rate_control_alg *alg;
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if (!ops->name)
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return -EINVAL;
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mutex_lock(&rate_ctrl_mutex);
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list_for_each_entry(alg, &rate_ctrl_algs, list) {
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if (!strcmp(alg->ops->name, ops->name)) {
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/* don't register an algorithm twice */
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WARN_ON(1);
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mutex_unlock(&rate_ctrl_mutex);
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return -EALREADY;
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}
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}
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alg = kzalloc(sizeof(*alg), GFP_KERNEL);
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if (alg == NULL) {
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mutex_unlock(&rate_ctrl_mutex);
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return -ENOMEM;
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}
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alg->ops = ops;
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list_add_tail(&alg->list, &rate_ctrl_algs);
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mutex_unlock(&rate_ctrl_mutex);
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return 0;
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}
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EXPORT_SYMBOL(ieee80211_rate_control_register);
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void ieee80211_rate_control_unregister(struct rate_control_ops *ops)
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{
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struct rate_control_alg *alg;
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mutex_lock(&rate_ctrl_mutex);
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list_for_each_entry(alg, &rate_ctrl_algs, list) {
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if (alg->ops == ops) {
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list_del(&alg->list);
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kfree(alg);
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break;
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}
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}
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mutex_unlock(&rate_ctrl_mutex);
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}
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EXPORT_SYMBOL(ieee80211_rate_control_unregister);
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static struct rate_control_ops *
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ieee80211_try_rate_control_ops_get(const char *name)
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{
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struct rate_control_alg *alg;
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struct rate_control_ops *ops = NULL;
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if (!name)
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return NULL;
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mutex_lock(&rate_ctrl_mutex);
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list_for_each_entry(alg, &rate_ctrl_algs, list) {
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if (!strcmp(alg->ops->name, name))
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if (try_module_get(alg->ops->module)) {
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ops = alg->ops;
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break;
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}
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}
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mutex_unlock(&rate_ctrl_mutex);
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return ops;
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}
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/* Get the rate control algorithm. */
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static struct rate_control_ops *
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ieee80211_rate_control_ops_get(const char *name)
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{
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struct rate_control_ops *ops;
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const char *alg_name;
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if (!name)
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alg_name = ieee80211_default_rc_algo;
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else
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alg_name = name;
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ops = ieee80211_try_rate_control_ops_get(alg_name);
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if (!ops) {
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request_module("rc80211_%s", alg_name);
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ops = ieee80211_try_rate_control_ops_get(alg_name);
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}
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if (!ops && name)
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/* try default if specific alg requested but not found */
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ops = ieee80211_try_rate_control_ops_get(ieee80211_default_rc_algo);
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/* try built-in one if specific alg requested but not found */
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if (!ops && strlen(CONFIG_MAC80211_RC_DEFAULT))
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ops = ieee80211_try_rate_control_ops_get(CONFIG_MAC80211_RC_DEFAULT);
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return ops;
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}
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static void ieee80211_rate_control_ops_put(struct rate_control_ops *ops)
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{
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module_put(ops->module);
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}
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#ifdef CONFIG_MAC80211_DEBUGFS
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static ssize_t rcname_read(struct file *file, char __user *userbuf,
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size_t count, loff_t *ppos)
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{
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struct rate_control_ref *ref = file->private_data;
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int len = strlen(ref->ops->name);
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return simple_read_from_buffer(userbuf, count, ppos,
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ref->ops->name, len);
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}
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static const struct file_operations rcname_ops = {
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.read = rcname_read,
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.open = mac80211_open_file_generic,
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};
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#endif
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struct rate_control_ref *rate_control_alloc(const char *name,
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struct ieee80211_local *local)
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{
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struct dentry *debugfsdir = NULL;
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struct rate_control_ref *ref;
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ref = kmalloc(sizeof(struct rate_control_ref), GFP_KERNEL);
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if (!ref)
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goto fail_ref;
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kref_init(&ref->kref);
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ref->local = local;
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ref->ops = ieee80211_rate_control_ops_get(name);
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if (!ref->ops)
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goto fail_ops;
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#ifdef CONFIG_MAC80211_DEBUGFS
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debugfsdir = debugfs_create_dir("rc", local->hw.wiphy->debugfsdir);
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local->debugfs.rcdir = debugfsdir;
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local->debugfs.rcname = debugfs_create_file("name", 0400, debugfsdir,
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ref, &rcname_ops);
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#endif
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ref->priv = ref->ops->alloc(&local->hw, debugfsdir);
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if (!ref->priv)
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goto fail_priv;
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return ref;
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fail_priv:
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ieee80211_rate_control_ops_put(ref->ops);
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fail_ops:
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kfree(ref);
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fail_ref:
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return NULL;
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}
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static void rate_control_release(struct kref *kref)
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{
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struct rate_control_ref *ctrl_ref;
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ctrl_ref = container_of(kref, struct rate_control_ref, kref);
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ctrl_ref->ops->free(ctrl_ref->priv);
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#ifdef CONFIG_MAC80211_DEBUGFS
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debugfs_remove(ctrl_ref->local->debugfs.rcname);
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ctrl_ref->local->debugfs.rcname = NULL;
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debugfs_remove(ctrl_ref->local->debugfs.rcdir);
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ctrl_ref->local->debugfs.rcdir = NULL;
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#endif
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ieee80211_rate_control_ops_put(ctrl_ref->ops);
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kfree(ctrl_ref);
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}
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void rate_control_get_rate(struct ieee80211_sub_if_data *sdata,
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struct sta_info *sta,
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struct ieee80211_tx_rate_control *txrc)
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{
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struct rate_control_ref *ref = sdata->local->rate_ctrl;
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void *priv_sta = NULL;
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struct ieee80211_sta *ista = NULL;
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struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb);
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int i;
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if (sta) {
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ista = &sta->sta;
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priv_sta = sta->rate_ctrl_priv;
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}
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for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
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info->control.rates[i].idx = -1;
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info->control.rates[i].flags = 0;
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info->control.rates[i].count = 1;
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}
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if (sta && sdata->force_unicast_rateidx > -1) {
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info->control.rates[0].idx = sdata->force_unicast_rateidx;
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} else {
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ref->ops->get_rate(ref->priv, ista, priv_sta, txrc);
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info->flags |= IEEE80211_TX_INTFL_RCALGO;
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}
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/*
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* try to enforce the maximum rate the user wanted
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*/
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if (sdata->max_ratectrl_rateidx > -1)
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for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
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if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS)
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continue;
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info->control.rates[i].idx =
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min_t(s8, info->control.rates[i].idx,
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sdata->max_ratectrl_rateidx);
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}
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BUG_ON(info->control.rates[0].idx < 0);
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}
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struct rate_control_ref *rate_control_get(struct rate_control_ref *ref)
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{
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kref_get(&ref->kref);
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return ref;
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}
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void rate_control_put(struct rate_control_ref *ref)
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{
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kref_put(&ref->kref, rate_control_release);
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}
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int ieee80211_init_rate_ctrl_alg(struct ieee80211_local *local,
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const char *name)
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{
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struct rate_control_ref *ref, *old;
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ASSERT_RTNL();
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if (local->open_count || netif_running(local->mdev))
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return -EBUSY;
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ref = rate_control_alloc(name, local);
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if (!ref) {
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printk(KERN_WARNING "%s: Failed to select rate control "
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"algorithm\n", wiphy_name(local->hw.wiphy));
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return -ENOENT;
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}
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old = local->rate_ctrl;
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local->rate_ctrl = ref;
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if (old) {
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rate_control_put(old);
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sta_info_flush(local, NULL);
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}
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printk(KERN_DEBUG "%s: Selected rate control "
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"algorithm '%s'\n", wiphy_name(local->hw.wiphy),
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ref->ops->name);
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return 0;
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}
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void rate_control_deinitialize(struct ieee80211_local *local)
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{
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struct rate_control_ref *ref;
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ref = local->rate_ctrl;
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local->rate_ctrl = NULL;
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rate_control_put(ref);
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}
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