// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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* Copyright 2017 Intel Deutschland GmbH
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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 <linux/module.h>
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#include <linux/slab.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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const 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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void rate_control_rate_init(struct sta_info *sta)
|
{
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struct ieee80211_local *local = sta->sdata->local;
|
struct rate_control_ref *ref = sta->rate_ctrl;
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struct ieee80211_sta *ista = &sta->sta;
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void *priv_sta = sta->rate_ctrl_priv;
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struct ieee80211_supported_band *sband;
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struct ieee80211_chanctx_conf *chanctx_conf;
|
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ieee80211_sta_set_rx_nss(sta);
|
|
if (!ref)
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return;
|
|
rcu_read_lock();
|
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chanctx_conf = rcu_dereference(sta->sdata->vif.chanctx_conf);
|
if (WARN_ON(!chanctx_conf)) {
|
rcu_read_unlock();
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return;
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}
|
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sband = local->hw.wiphy->bands[chanctx_conf->def.chan->band];
|
|
/* TODO: check for minstrel_s1g ? */
|
if (sband->band == NL80211_BAND_S1GHZ) {
|
ieee80211_s1g_sta_rate_init(sta);
|
rcu_read_unlock();
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return;
|
}
|
|
spin_lock_bh(&sta->rate_ctrl_lock);
|
ref->ops->rate_init(ref->priv, sband, &chanctx_conf->def, ista,
|
priv_sta);
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spin_unlock_bh(&sta->rate_ctrl_lock);
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rcu_read_unlock();
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set_sta_flag(sta, WLAN_STA_RATE_CONTROL);
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}
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void rate_control_tx_status(struct ieee80211_local *local,
|
struct ieee80211_supported_band *sband,
|
struct ieee80211_tx_status *st)
|
{
|
struct rate_control_ref *ref = local->rate_ctrl;
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struct sta_info *sta = container_of(st->sta, struct sta_info, sta);
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void *priv_sta = sta->rate_ctrl_priv;
|
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if (!ref || !test_sta_flag(sta, WLAN_STA_RATE_CONTROL))
|
return;
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spin_lock_bh(&sta->rate_ctrl_lock);
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if (ref->ops->tx_status_ext)
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ref->ops->tx_status_ext(ref->priv, sband, priv_sta, st);
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else if (st->skb)
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ref->ops->tx_status(ref->priv, sband, st->sta, priv_sta, st->skb);
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else
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WARN_ON_ONCE(1);
|
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spin_unlock_bh(&sta->rate_ctrl_lock);
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}
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void rate_control_rate_update(struct ieee80211_local *local,
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struct ieee80211_supported_band *sband,
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struct sta_info *sta, u32 changed)
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{
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struct rate_control_ref *ref = local->rate_ctrl;
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struct ieee80211_sta *ista = &sta->sta;
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void *priv_sta = sta->rate_ctrl_priv;
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struct ieee80211_chanctx_conf *chanctx_conf;
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if (ref && ref->ops->rate_update) {
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rcu_read_lock();
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chanctx_conf = rcu_dereference(sta->sdata->vif.chanctx_conf);
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if (WARN_ON(!chanctx_conf)) {
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rcu_read_unlock();
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return;
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}
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spin_lock_bh(&sta->rate_ctrl_lock);
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ref->ops->rate_update(ref->priv, sband, &chanctx_conf->def,
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ista, priv_sta, changed);
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spin_unlock_bh(&sta->rate_ctrl_lock);
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rcu_read_unlock();
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}
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drv_sta_rc_update(local, sta->sdata, &sta->sta, changed);
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}
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int ieee80211_rate_control_register(const struct rate_control_ops *ops)
|
{
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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);
|
if (alg == NULL) {
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mutex_unlock(&rate_ctrl_mutex);
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return -ENOMEM;
|
}
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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(const 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 const 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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const 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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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 const struct rate_control_ops *
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ieee80211_rate_control_ops_get(const char *name)
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{
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const struct rate_control_ops *ops;
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const char *alg_name;
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kernel_param_lock(THIS_MODULE);
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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 && 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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/* Note: check for > 0 is intentional to avoid clang warning */
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if (!ops && (strlen(CONFIG_MAC80211_RC_DEFAULT) > 0))
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/* try built-in one if specific alg requested but not found */
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ops = ieee80211_try_rate_control_ops_get(CONFIG_MAC80211_RC_DEFAULT);
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kernel_param_unlock(THIS_MODULE);
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return ops;
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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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const struct file_operations rcname_ops = {
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.read = rcname_read,
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.open = simple_open,
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.llseek = default_llseek,
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};
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#endif
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static struct rate_control_ref *
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rate_control_alloc(const char *name, 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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return NULL;
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ref->ops = ieee80211_rate_control_ops_get(name);
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if (!ref->ops)
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goto free;
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ref->priv = ref->ops->alloc(&local->hw);
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if (!ref->priv)
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goto free;
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return ref;
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free:
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kfree(ref);
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return NULL;
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}
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static void rate_control_free(struct ieee80211_local *local,
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struct rate_control_ref *ctrl_ref)
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{
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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_recursive(local->debugfs.rcdir);
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local->debugfs.rcdir = NULL;
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#endif
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kfree(ctrl_ref);
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}
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void ieee80211_check_rate_mask(struct ieee80211_sub_if_data *sdata)
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{
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struct ieee80211_local *local = sdata->local;
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struct ieee80211_supported_band *sband;
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u32 user_mask, basic_rates = sdata->vif.bss_conf.basic_rates;
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enum nl80211_band band;
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if (WARN_ON(!sdata->vif.bss_conf.chandef.chan))
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return;
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band = sdata->vif.bss_conf.chandef.chan->band;
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if (band == NL80211_BAND_S1GHZ) {
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/* TODO */
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return;
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}
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if (WARN_ON_ONCE(!basic_rates))
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return;
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user_mask = sdata->rc_rateidx_mask[band];
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sband = local->hw.wiphy->bands[band];
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if (user_mask & basic_rates)
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return;
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sdata_dbg(sdata,
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"no overlap between basic rates (0x%x) and user mask (0x%x on band %d) - clearing the latter",
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basic_rates, user_mask, band);
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sdata->rc_rateidx_mask[band] = (1 << sband->n_bitrates) - 1;
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}
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static bool rc_no_data_or_no_ack_use_min(struct ieee80211_tx_rate_control *txrc)
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{
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struct sk_buff *skb = txrc->skb;
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
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struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
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__le16 fc;
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fc = hdr->frame_control;
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return (info->flags & (IEEE80211_TX_CTL_NO_ACK |
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IEEE80211_TX_CTL_USE_MINRATE)) ||
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!ieee80211_is_data(fc);
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}
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static void rc_send_low_basicrate(struct ieee80211_tx_rate *rate,
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u32 basic_rates,
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struct ieee80211_supported_band *sband)
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{
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u8 i;
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if (sband->band == NL80211_BAND_S1GHZ) {
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/* TODO */
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rate->flags |= IEEE80211_TX_RC_S1G_MCS;
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rate->idx = 0;
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return;
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}
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if (basic_rates == 0)
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return; /* assume basic rates unknown and accept rate */
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if (rate->idx < 0)
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return;
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if (basic_rates & (1 << rate->idx))
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return; /* selected rate is a basic rate */
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for (i = rate->idx + 1; i <= sband->n_bitrates; i++) {
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if (basic_rates & (1 << i)) {
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rate->idx = i;
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return;
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}
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}
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/* could not find a basic rate; use original selection */
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}
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static void __rate_control_send_low(struct ieee80211_hw *hw,
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struct ieee80211_supported_band *sband,
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struct ieee80211_sta *sta,
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struct ieee80211_tx_info *info,
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u32 rate_mask)
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{
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int i;
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u32 rate_flags =
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ieee80211_chandef_rate_flags(&hw->conf.chandef);
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if (sband->band == NL80211_BAND_S1GHZ) {
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info->control.rates[0].flags |= IEEE80211_TX_RC_S1G_MCS;
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info->control.rates[0].idx = 0;
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return;
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}
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if ((sband->band == NL80211_BAND_2GHZ) &&
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(info->flags & IEEE80211_TX_CTL_NO_CCK_RATE))
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rate_flags |= IEEE80211_RATE_ERP_G;
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info->control.rates[0].idx = 0;
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for (i = 0; i < sband->n_bitrates; i++) {
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if (!(rate_mask & BIT(i)))
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continue;
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if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
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continue;
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if (!rate_supported(sta, sband->band, i))
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continue;
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info->control.rates[0].idx = i;
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break;
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}
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WARN_ONCE(i == sband->n_bitrates,
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"no supported rates for sta %pM (0x%x, band %d) in rate_mask 0x%x with flags 0x%x\n",
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sta ? sta->addr : NULL,
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sta ? sta->supp_rates[sband->band] : -1,
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sband->band,
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rate_mask, rate_flags);
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info->control.rates[0].count =
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(info->flags & IEEE80211_TX_CTL_NO_ACK) ?
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1 : hw->max_rate_tries;
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info->control.skip_table = 1;
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}
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static bool rate_control_send_low(struct ieee80211_sta *pubsta,
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struct ieee80211_tx_rate_control *txrc)
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{
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struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb);
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struct ieee80211_supported_band *sband = txrc->sband;
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struct sta_info *sta;
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int mcast_rate;
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bool use_basicrate = false;
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if (!pubsta || rc_no_data_or_no_ack_use_min(txrc)) {
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__rate_control_send_low(txrc->hw, sband, pubsta, info,
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txrc->rate_idx_mask);
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if (!pubsta && txrc->bss) {
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mcast_rate = txrc->bss_conf->mcast_rate[sband->band];
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if (mcast_rate > 0) {
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info->control.rates[0].idx = mcast_rate - 1;
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return true;
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}
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use_basicrate = true;
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} else if (pubsta) {
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sta = container_of(pubsta, struct sta_info, sta);
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if (ieee80211_vif_is_mesh(&sta->sdata->vif))
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use_basicrate = true;
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}
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if (use_basicrate)
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rc_send_low_basicrate(&info->control.rates[0],
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txrc->bss_conf->basic_rates,
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sband);
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return true;
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}
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return false;
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}
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static bool rate_idx_match_legacy_mask(s8 *rate_idx, int n_bitrates, u32 mask)
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{
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int j;
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/* See whether the selected rate or anything below it is allowed. */
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for (j = *rate_idx; j >= 0; j--) {
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if (mask & (1 << j)) {
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/* Okay, found a suitable rate. Use it. */
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*rate_idx = j;
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return true;
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}
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}
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/* Try to find a higher rate that would be allowed */
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for (j = *rate_idx + 1; j < n_bitrates; j++) {
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if (mask & (1 << j)) {
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/* Okay, found a suitable rate. Use it. */
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*rate_idx = j;
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return true;
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}
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}
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return false;
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}
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static bool rate_idx_match_mcs_mask(s8 *rate_idx, u8 *mcs_mask)
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{
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int i, j;
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int ridx, rbit;
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ridx = *rate_idx / 8;
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rbit = *rate_idx % 8;
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/* sanity check */
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if (ridx < 0 || ridx >= IEEE80211_HT_MCS_MASK_LEN)
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return false;
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/* See whether the selected rate or anything below it is allowed. */
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for (i = ridx; i >= 0; i--) {
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for (j = rbit; j >= 0; j--)
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if (mcs_mask[i] & BIT(j)) {
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*rate_idx = i * 8 + j;
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return true;
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}
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rbit = 7;
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}
|
|
/* Try to find a higher rate that would be allowed */
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ridx = (*rate_idx + 1) / 8;
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rbit = (*rate_idx + 1) % 8;
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for (i = ridx; i < IEEE80211_HT_MCS_MASK_LEN; i++) {
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for (j = rbit; j < 8; j++)
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if (mcs_mask[i] & BIT(j)) {
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*rate_idx = i * 8 + j;
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return true;
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}
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rbit = 0;
|
}
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return false;
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}
|
|
static bool rate_idx_match_vht_mcs_mask(s8 *rate_idx, u16 *vht_mask)
|
{
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int i, j;
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int ridx, rbit;
|
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ridx = *rate_idx >> 4;
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rbit = *rate_idx & 0xf;
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if (ridx < 0 || ridx >= NL80211_VHT_NSS_MAX)
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return false;
|
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/* See whether the selected rate or anything below it is allowed. */
|
for (i = ridx; i >= 0; i--) {
|
for (j = rbit; j >= 0; j--) {
|
if (vht_mask[i] & BIT(j)) {
|
*rate_idx = (i << 4) | j;
|
return true;
|
}
|
}
|
rbit = 15;
|
}
|
|
/* Try to find a higher rate that would be allowed */
|
ridx = (*rate_idx + 1) >> 4;
|
rbit = (*rate_idx + 1) & 0xf;
|
|
for (i = ridx; i < NL80211_VHT_NSS_MAX; i++) {
|
for (j = rbit; j < 16; j++) {
|
if (vht_mask[i] & BIT(j)) {
|
*rate_idx = (i << 4) | j;
|
return true;
|
}
|
}
|
rbit = 0;
|
}
|
return false;
|
}
|
|
static void rate_idx_match_mask(s8 *rate_idx, u16 *rate_flags,
|
struct ieee80211_supported_band *sband,
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enum nl80211_chan_width chan_width,
|
u32 mask,
|
u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN],
|
u16 vht_mask[NL80211_VHT_NSS_MAX])
|
{
|
if (*rate_flags & IEEE80211_TX_RC_VHT_MCS) {
|
/* handle VHT rates */
|
if (rate_idx_match_vht_mcs_mask(rate_idx, vht_mask))
|
return;
|
|
*rate_idx = 0;
|
/* keep protection flags */
|
*rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS |
|
IEEE80211_TX_RC_USE_CTS_PROTECT |
|
IEEE80211_TX_RC_USE_SHORT_PREAMBLE);
|
|
*rate_flags |= IEEE80211_TX_RC_MCS;
|
if (chan_width == NL80211_CHAN_WIDTH_40)
|
*rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
|
|
if (rate_idx_match_mcs_mask(rate_idx, mcs_mask))
|
return;
|
|
/* also try the legacy rates. */
|
*rate_flags &= ~(IEEE80211_TX_RC_MCS |
|
IEEE80211_TX_RC_40_MHZ_WIDTH);
|
if (rate_idx_match_legacy_mask(rate_idx, sband->n_bitrates,
|
mask))
|
return;
|
} else if (*rate_flags & IEEE80211_TX_RC_MCS) {
|
/* handle HT rates */
|
if (rate_idx_match_mcs_mask(rate_idx, mcs_mask))
|
return;
|
|
/* also try the legacy rates. */
|
*rate_idx = 0;
|
/* keep protection flags */
|
*rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS |
|
IEEE80211_TX_RC_USE_CTS_PROTECT |
|
IEEE80211_TX_RC_USE_SHORT_PREAMBLE);
|
if (rate_idx_match_legacy_mask(rate_idx, sband->n_bitrates,
|
mask))
|
return;
|
} else {
|
/* handle legacy rates */
|
if (rate_idx_match_legacy_mask(rate_idx, sband->n_bitrates,
|
mask))
|
return;
|
|
/* if HT BSS, and we handle a data frame, also try HT rates */
|
switch (chan_width) {
|
case NL80211_CHAN_WIDTH_20_NOHT:
|
case NL80211_CHAN_WIDTH_5:
|
case NL80211_CHAN_WIDTH_10:
|
return;
|
default:
|
break;
|
}
|
|
*rate_idx = 0;
|
/* keep protection flags */
|
*rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS |
|
IEEE80211_TX_RC_USE_CTS_PROTECT |
|
IEEE80211_TX_RC_USE_SHORT_PREAMBLE);
|
|
*rate_flags |= IEEE80211_TX_RC_MCS;
|
|
if (chan_width == NL80211_CHAN_WIDTH_40)
|
*rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
|
|
if (rate_idx_match_mcs_mask(rate_idx, mcs_mask))
|
return;
|
}
|
|
/*
|
* Uh.. No suitable rate exists. This should not really happen with
|
* sane TX rate mask configurations. However, should someone manage to
|
* configure supported rates and TX rate mask in incompatible way,
|
* allow the frame to be transmitted with whatever the rate control
|
* selected.
|
*/
|
}
|
|
static void rate_fixup_ratelist(struct ieee80211_vif *vif,
|
struct ieee80211_supported_band *sband,
|
struct ieee80211_tx_info *info,
|
struct ieee80211_tx_rate *rates,
|
int max_rates)
|
{
|
struct ieee80211_rate *rate;
|
bool inval = false;
|
int i;
|
|
/*
|
* Set up the RTS/CTS rate as the fastest basic rate
|
* that is not faster than the data rate unless there
|
* is no basic rate slower than the data rate, in which
|
* case we pick the slowest basic rate
|
*
|
* XXX: Should this check all retry rates?
|
*/
|
if (!(rates[0].flags &
|
(IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))) {
|
u32 basic_rates = vif->bss_conf.basic_rates;
|
s8 baserate = basic_rates ? ffs(basic_rates) - 1 : 0;
|
|
rate = &sband->bitrates[rates[0].idx];
|
|
for (i = 0; i < sband->n_bitrates; i++) {
|
/* must be a basic rate */
|
if (!(basic_rates & BIT(i)))
|
continue;
|
/* must not be faster than the data rate */
|
if (sband->bitrates[i].bitrate > rate->bitrate)
|
continue;
|
/* maximum */
|
if (sband->bitrates[baserate].bitrate <
|
sband->bitrates[i].bitrate)
|
baserate = i;
|
}
|
|
info->control.rts_cts_rate_idx = baserate;
|
}
|
|
for (i = 0; i < max_rates; i++) {
|
/*
|
* make sure there's no valid rate following
|
* an invalid one, just in case drivers don't
|
* take the API seriously to stop at -1.
|
*/
|
if (inval) {
|
rates[i].idx = -1;
|
continue;
|
}
|
if (rates[i].idx < 0) {
|
inval = true;
|
continue;
|
}
|
|
/*
|
* For now assume MCS is already set up correctly, this
|
* needs to be fixed.
|
*/
|
if (rates[i].flags & IEEE80211_TX_RC_MCS) {
|
WARN_ON(rates[i].idx > 76);
|
|
if (!(rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS) &&
|
info->control.use_cts_prot)
|
rates[i].flags |=
|
IEEE80211_TX_RC_USE_CTS_PROTECT;
|
continue;
|
}
|
|
if (rates[i].flags & IEEE80211_TX_RC_VHT_MCS) {
|
WARN_ON(ieee80211_rate_get_vht_mcs(&rates[i]) > 9);
|
continue;
|
}
|
|
/* set up RTS protection if desired */
|
if (info->control.use_rts) {
|
rates[i].flags |= IEEE80211_TX_RC_USE_RTS_CTS;
|
info->control.use_cts_prot = false;
|
}
|
|
/* RC is busted */
|
if (WARN_ON_ONCE(rates[i].idx >= sband->n_bitrates)) {
|
rates[i].idx = -1;
|
continue;
|
}
|
|
rate = &sband->bitrates[rates[i].idx];
|
|
/* set up short preamble */
|
if (info->control.short_preamble &&
|
rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
|
rates[i].flags |= IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
|
|
/* set up G protection */
|
if (!(rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS) &&
|
info->control.use_cts_prot &&
|
rate->flags & IEEE80211_RATE_ERP_G)
|
rates[i].flags |= IEEE80211_TX_RC_USE_CTS_PROTECT;
|
}
|
}
|
|
|
static void rate_control_fill_sta_table(struct ieee80211_sta *sta,
|
struct ieee80211_tx_info *info,
|
struct ieee80211_tx_rate *rates,
|
int max_rates)
|
{
|
struct ieee80211_sta_rates *ratetbl = NULL;
|
int i;
|
|
if (sta && !info->control.skip_table)
|
ratetbl = rcu_dereference(sta->rates);
|
|
/* Fill remaining rate slots with data from the sta rate table. */
|
max_rates = min_t(int, max_rates, IEEE80211_TX_RATE_TABLE_SIZE);
|
for (i = 0; i < max_rates; i++) {
|
if (i < ARRAY_SIZE(info->control.rates) &&
|
info->control.rates[i].idx >= 0 &&
|
info->control.rates[i].count) {
|
if (rates != info->control.rates)
|
rates[i] = info->control.rates[i];
|
} else if (ratetbl) {
|
rates[i].idx = ratetbl->rate[i].idx;
|
rates[i].flags = ratetbl->rate[i].flags;
|
if (info->control.use_rts)
|
rates[i].count = ratetbl->rate[i].count_rts;
|
else if (info->control.use_cts_prot)
|
rates[i].count = ratetbl->rate[i].count_cts;
|
else
|
rates[i].count = ratetbl->rate[i].count;
|
} else {
|
rates[i].idx = -1;
|
rates[i].count = 0;
|
}
|
|
if (rates[i].idx < 0 || !rates[i].count)
|
break;
|
}
|
}
|
|
static bool rate_control_cap_mask(struct ieee80211_sub_if_data *sdata,
|
struct ieee80211_supported_band *sband,
|
struct ieee80211_sta *sta, u32 *mask,
|
u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN],
|
u16 vht_mask[NL80211_VHT_NSS_MAX])
|
{
|
u32 i, flags;
|
|
*mask = sdata->rc_rateidx_mask[sband->band];
|
flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
|
for (i = 0; i < sband->n_bitrates; i++) {
|
if ((flags & sband->bitrates[i].flags) != flags)
|
*mask &= ~BIT(i);
|
}
|
|
if (*mask == (1 << sband->n_bitrates) - 1 &&
|
!sdata->rc_has_mcs_mask[sband->band] &&
|
!sdata->rc_has_vht_mcs_mask[sband->band])
|
return false;
|
|
if (sdata->rc_has_mcs_mask[sband->band])
|
memcpy(mcs_mask, sdata->rc_rateidx_mcs_mask[sband->band],
|
IEEE80211_HT_MCS_MASK_LEN);
|
else
|
memset(mcs_mask, 0xff, IEEE80211_HT_MCS_MASK_LEN);
|
|
if (sdata->rc_has_vht_mcs_mask[sband->band])
|
memcpy(vht_mask, sdata->rc_rateidx_vht_mcs_mask[sband->band],
|
sizeof(u16) * NL80211_VHT_NSS_MAX);
|
else
|
memset(vht_mask, 0xff, sizeof(u16) * NL80211_VHT_NSS_MAX);
|
|
if (sta) {
|
__le16 sta_vht_cap;
|
u16 sta_vht_mask[NL80211_VHT_NSS_MAX];
|
|
/* Filter out rates that the STA does not support */
|
*mask &= sta->supp_rates[sband->band];
|
for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++)
|
mcs_mask[i] &= sta->ht_cap.mcs.rx_mask[i];
|
|
sta_vht_cap = sta->vht_cap.vht_mcs.rx_mcs_map;
|
ieee80211_get_vht_mask_from_cap(sta_vht_cap, sta_vht_mask);
|
for (i = 0; i < NL80211_VHT_NSS_MAX; i++)
|
vht_mask[i] &= sta_vht_mask[i];
|
}
|
|
return true;
|
}
|
|
static void
|
rate_control_apply_mask_ratetbl(struct sta_info *sta,
|
struct ieee80211_supported_band *sband,
|
struct ieee80211_sta_rates *rates)
|
{
|
int i;
|
u32 mask;
|
u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN];
|
u16 vht_mask[NL80211_VHT_NSS_MAX];
|
enum nl80211_chan_width chan_width;
|
|
if (!rate_control_cap_mask(sta->sdata, sband, &sta->sta, &mask,
|
mcs_mask, vht_mask))
|
return;
|
|
chan_width = sta->sdata->vif.bss_conf.chandef.width;
|
for (i = 0; i < IEEE80211_TX_RATE_TABLE_SIZE; i++) {
|
if (rates->rate[i].idx < 0)
|
break;
|
|
rate_idx_match_mask(&rates->rate[i].idx, &rates->rate[i].flags,
|
sband, chan_width, mask, mcs_mask,
|
vht_mask);
|
}
|
}
|
|
static void rate_control_apply_mask(struct ieee80211_sub_if_data *sdata,
|
struct ieee80211_sta *sta,
|
struct ieee80211_supported_band *sband,
|
struct ieee80211_tx_rate *rates,
|
int max_rates)
|
{
|
enum nl80211_chan_width chan_width;
|
u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN];
|
u32 mask;
|
u16 rate_flags, vht_mask[NL80211_VHT_NSS_MAX];
|
int i;
|
|
/*
|
* Try to enforce the rateidx mask the user wanted. skip this if the
|
* default mask (allow all rates) is used to save some processing for
|
* the common case.
|
*/
|
if (!rate_control_cap_mask(sdata, sband, sta, &mask, mcs_mask,
|
vht_mask))
|
return;
|
|
/*
|
* Make sure the rate index selected for each TX rate is
|
* included in the configured mask and change the rate indexes
|
* if needed.
|
*/
|
chan_width = sdata->vif.bss_conf.chandef.width;
|
for (i = 0; i < max_rates; i++) {
|
/* Skip invalid rates */
|
if (rates[i].idx < 0)
|
break;
|
|
rate_flags = rates[i].flags;
|
rate_idx_match_mask(&rates[i].idx, &rate_flags, sband,
|
chan_width, mask, mcs_mask, vht_mask);
|
rates[i].flags = rate_flags;
|
}
|
}
|
|
void ieee80211_get_tx_rates(struct ieee80211_vif *vif,
|
struct ieee80211_sta *sta,
|
struct sk_buff *skb,
|
struct ieee80211_tx_rate *dest,
|
int max_rates)
|
{
|
struct ieee80211_sub_if_data *sdata;
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
|
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
|
struct ieee80211_supported_band *sband;
|
|
rate_control_fill_sta_table(sta, info, dest, max_rates);
|
|
if (!vif)
|
return;
|
|
sdata = vif_to_sdata(vif);
|
sband = sdata->local->hw.wiphy->bands[info->band];
|
|
if (ieee80211_is_data(hdr->frame_control))
|
rate_control_apply_mask(sdata, sta, sband, dest, max_rates);
|
|
if (dest[0].idx < 0)
|
__rate_control_send_low(&sdata->local->hw, sband, sta, info,
|
sdata->rc_rateidx_mask[info->band]);
|
|
if (sta)
|
rate_fixup_ratelist(vif, sband, info, dest, max_rates);
|
}
|
EXPORT_SYMBOL(ieee80211_get_tx_rates);
|
|
void rate_control_get_rate(struct ieee80211_sub_if_data *sdata,
|
struct sta_info *sta,
|
struct ieee80211_tx_rate_control *txrc)
|
{
|
struct rate_control_ref *ref = sdata->local->rate_ctrl;
|
void *priv_sta = NULL;
|
struct ieee80211_sta *ista = NULL;
|
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb);
|
int i;
|
|
for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
|
info->control.rates[i].idx = -1;
|
info->control.rates[i].flags = 0;
|
info->control.rates[i].count = 0;
|
}
|
|
if (rate_control_send_low(sta ? &sta->sta : NULL, txrc))
|
return;
|
|
if (ieee80211_hw_check(&sdata->local->hw, HAS_RATE_CONTROL))
|
return;
|
|
if (sta && test_sta_flag(sta, WLAN_STA_RATE_CONTROL)) {
|
ista = &sta->sta;
|
priv_sta = sta->rate_ctrl_priv;
|
}
|
|
if (ista) {
|
spin_lock_bh(&sta->rate_ctrl_lock);
|
ref->ops->get_rate(ref->priv, ista, priv_sta, txrc);
|
spin_unlock_bh(&sta->rate_ctrl_lock);
|
} else {
|
rate_control_send_low(NULL, txrc);
|
}
|
|
if (ieee80211_hw_check(&sdata->local->hw, SUPPORTS_RC_TABLE))
|
return;
|
|
ieee80211_get_tx_rates(&sdata->vif, ista, txrc->skb,
|
info->control.rates,
|
ARRAY_SIZE(info->control.rates));
|
}
|
|
int rate_control_set_rates(struct ieee80211_hw *hw,
|
struct ieee80211_sta *pubsta,
|
struct ieee80211_sta_rates *rates)
|
{
|
struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
|
struct ieee80211_sta_rates *old;
|
struct ieee80211_supported_band *sband;
|
|
sband = ieee80211_get_sband(sta->sdata);
|
if (!sband)
|
return -EINVAL;
|
rate_control_apply_mask_ratetbl(sta, sband, rates);
|
/*
|
* mac80211 guarantees that this function will not be called
|
* concurrently, so the following RCU access is safe, even without
|
* extra locking. This can not be checked easily, so we just set
|
* the condition to true.
|
*/
|
old = rcu_dereference_protected(pubsta->rates, true);
|
rcu_assign_pointer(pubsta->rates, rates);
|
if (old)
|
kfree_rcu(old, rcu_head);
|
|
if (sta->uploaded)
|
drv_sta_rate_tbl_update(hw_to_local(hw), sta->sdata, pubsta);
|
|
ieee80211_sta_set_expected_throughput(pubsta, sta_get_expected_throughput(sta));
|
|
return 0;
|
}
|
EXPORT_SYMBOL(rate_control_set_rates);
|
|
int ieee80211_init_rate_ctrl_alg(struct ieee80211_local *local,
|
const char *name)
|
{
|
struct rate_control_ref *ref;
|
|
ASSERT_RTNL();
|
|
if (local->open_count)
|
return -EBUSY;
|
|
if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
|
if (WARN_ON(!local->ops->set_rts_threshold))
|
return -EINVAL;
|
return 0;
|
}
|
|
ref = rate_control_alloc(name, local);
|
if (!ref) {
|
wiphy_warn(local->hw.wiphy,
|
"Failed to select rate control algorithm\n");
|
return -ENOENT;
|
}
|
|
WARN_ON(local->rate_ctrl);
|
local->rate_ctrl = ref;
|
|
wiphy_debug(local->hw.wiphy, "Selected rate control algorithm '%s'\n",
|
ref->ops->name);
|
|
return 0;
|
}
|
|
void rate_control_deinitialize(struct ieee80211_local *local)
|
{
|
struct rate_control_ref *ref;
|
|
ref = local->rate_ctrl;
|
|
if (!ref)
|
return;
|
|
local->rate_ctrl = NULL;
|
rate_control_free(local, ref);
|
}
|
