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4b475898ec
This patch changes mac80211's Kconfig/Makefile to: * select between the PID and the SIMPLE rate control algorithm as default * always allow tri-state for the rate control algorithms, building those that are selected 'y' into the mac80211 module (if that is a module, otherwise all into the kernel) * force the default rate control algorithm to be built into mac80211 It also makes both rate control algorithms proper modules again with MODULE_LICENSE etc. Only if EMBEDDED is the user allowed to select "NONE" as default which will cause no algorithm to be selected, this will work only when the driver brings one itself (e.g. iwlwifi drivers). Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
263 lines
6.3 KiB
C
263 lines
6.3 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 "ieee80211_rate.h"
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#include "ieee80211_i.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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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 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->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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ref->priv = ref->ops->alloc(local);
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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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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 net_device *dev,
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struct ieee80211_hw_mode *mode, struct sk_buff *skb,
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struct rate_selection *sel)
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{
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struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
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struct rate_control_ref *ref = local->rate_ctrl;
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struct ieee80211_sub_if_data *sdata;
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
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struct sta_info *sta = sta_info_get(local, hdr->addr1);
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int i;
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u16 fc;
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memset(sel, 0, sizeof(struct rate_selection));
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/* Send management frames and broadcast/multicast data using lowest
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* rate. */
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fc = le16_to_cpu(hdr->frame_control);
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if ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA ||
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is_multicast_ether_addr(hdr->addr1))
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sel->rate = rate_lowest(local, mode, sta);
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/* If a forced rate is in effect, select it. */
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sdata = IEEE80211_DEV_TO_SUB_IF(dev);
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if (sdata->bss && sdata->bss->force_unicast_rateidx > -1)
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sel->rate = &mode->rates[sdata->bss->force_unicast_rateidx];
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/* If we haven't found the rate yet, ask the rate control algo. */
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if (!sel->rate)
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ref->ops->get_rate(ref->priv, dev, mode, skb, sel);
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/* Select a non-ERP backup rate. */
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if (!sel->nonerp) {
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for (i = 0; i < mode->num_rates - 1; i++) {
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struct ieee80211_rate *rate = &mode->rates[i];
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if (sel->rate->rate < rate->rate)
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break;
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if (rate_supported(sta, mode, i) &&
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!(rate->flags & IEEE80211_RATE_ERP))
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sel->nonerp = rate;
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}
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}
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if (sta)
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sta_info_put(sta);
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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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