mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-11 00:36:40 +07:00
0d528d85c5
Allow rate control modules to pass a rate selection table to mac80211 and the driver. This allows drivers to fetch the most recent rate selection from the sta pointer for already buffered frames. This allows rate control to respond faster to sudden link changes and it is also a step towards adding minstrel_ht support to drivers like iwlwifi. When a driver sets IEEE80211_HW_SUPPORTS_RC_TABLE, mac80211 will not fill info->control.rates with rates from the rate table (to preserve explicit overrides by the rate control module). The driver then explicitly calls ieee80211_get_tx_rates to merge overrides from info->control.rates with defaults from the sta rate table. Signed-off-by: Felix Fietkau <nbd@openwrt.org> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
746 lines
18 KiB
C
746 lines
18 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 <linux/slab.h>
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#include <linux/module.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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kparam_block_sysfs_write(ieee80211_default_rc_algo);
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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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kparam_unblock_sysfs_write(ieee80211_default_rc_algo);
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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 = 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 *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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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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debugfs_create_file("name", 0400, debugfsdir, 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_free(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(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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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_broadcast(s8 *idx, 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 (basic_rates == 0)
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return; /* assume basic rates unknown and accept rate */
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if (*idx < 0)
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return;
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if (basic_rates & (1 << *idx))
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return; /* selected rate is a basic rate */
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for (i = *idx + 1; i <= sband->n_bitrates; i++) {
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if (basic_rates & (1 << i)) {
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*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 inline s8
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rate_lowest_non_cck_index(struct ieee80211_supported_band *sband,
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struct ieee80211_sta *sta)
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{
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int i;
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for (i = 0; i < sband->n_bitrates; i++) {
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struct ieee80211_rate *srate = &sband->bitrates[i];
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if ((srate->bitrate == 10) || (srate->bitrate == 20) ||
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(srate->bitrate == 55) || (srate->bitrate == 110))
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continue;
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if (rate_supported(sta, sband->band, i))
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return i;
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}
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/* No matching rate found */
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return 0;
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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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{
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if ((sband->band != IEEE80211_BAND_2GHZ) ||
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!(info->flags & IEEE80211_TX_CTL_NO_CCK_RATE))
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info->control.rates[0].idx = rate_lowest_index(sband, sta);
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else
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info->control.rates[0].idx =
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rate_lowest_non_cck_index(sband, sta);
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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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bool rate_control_send_low(struct ieee80211_sta *sta,
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void *priv_sta,
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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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int mcast_rate;
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if (!sta || !priv_sta || rc_no_data_or_no_ack_use_min(txrc)) {
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__rate_control_send_low(txrc->hw, sband, sta, info);
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if (!sta && 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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rc_send_low_broadcast(&info->control.rates[0].idx,
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txrc->bss_conf->basic_rates,
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sband);
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}
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return true;
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}
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return false;
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}
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EXPORT_SYMBOL(rate_control_send_low);
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static bool rate_idx_match_legacy_mask(struct ieee80211_tx_rate *rate,
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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(struct ieee80211_tx_rate *rate,
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u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN])
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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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}
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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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}
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return false;
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}
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static void rate_idx_match_mask(struct ieee80211_tx_rate *rate,
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struct ieee80211_supported_band *sband,
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enum nl80211_chan_width chan_width,
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u32 mask,
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u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN])
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{
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struct ieee80211_tx_rate alt_rate;
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/* handle HT rates */
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if (rate->flags & IEEE80211_TX_RC_MCS) {
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if (rate_idx_match_mcs_mask(rate, mcs_mask))
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return;
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/* also try the legacy rates. */
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alt_rate.idx = 0;
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/* keep protection flags */
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alt_rate.flags = rate->flags &
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(IEEE80211_TX_RC_USE_RTS_CTS |
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IEEE80211_TX_RC_USE_CTS_PROTECT |
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IEEE80211_TX_RC_USE_SHORT_PREAMBLE);
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alt_rate.count = rate->count;
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if (rate_idx_match_legacy_mask(&alt_rate,
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sband->n_bitrates, mask)) {
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*rate = alt_rate;
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return;
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}
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} else {
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/* handle legacy rates */
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if (rate_idx_match_legacy_mask(rate, sband->n_bitrates, mask))
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return;
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/* if HT BSS, and we handle a data frame, also try HT rates */
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if (chan_width == NL80211_CHAN_WIDTH_20_NOHT)
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return;
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alt_rate.idx = 0;
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/* keep protection flags */
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alt_rate.flags = rate->flags &
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(IEEE80211_TX_RC_USE_RTS_CTS |
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IEEE80211_TX_RC_USE_CTS_PROTECT |
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IEEE80211_TX_RC_USE_SHORT_PREAMBLE);
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alt_rate.count = rate->count;
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alt_rate.flags |= IEEE80211_TX_RC_MCS;
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if (chan_width == NL80211_CHAN_WIDTH_40)
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alt_rate.flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
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if (rate_idx_match_mcs_mask(&alt_rate, mcs_mask)) {
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*rate = alt_rate;
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return;
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}
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}
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/*
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* Uh.. No suitable rate exists. This should not really happen with
|
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* sane TX rate mask configurations. However, should someone manage to
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* configure supported rates and TX rate mask in incompatible way,
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* allow the frame to be transmitted with whatever the rate control
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* selected.
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*/
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}
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static void rate_fixup_ratelist(struct ieee80211_vif *vif,
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struct ieee80211_supported_band *sband,
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struct ieee80211_tx_info *info,
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struct ieee80211_tx_rate *rates,
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int max_rates)
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{
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struct ieee80211_rate *rate;
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bool inval = false;
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int i;
|
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|
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/*
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* Set up the RTS/CTS rate as the fastest basic rate
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* that is not faster than the data rate unless there
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* is no basic rate slower than the data rate, in which
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* case we pick the slowest basic rate
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*
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* XXX: Should this check all retry rates?
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*/
|
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if (!(rates[0].flags & IEEE80211_TX_RC_MCS)) {
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u32 basic_rates = vif->bss_conf.basic_rates;
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s8 baserate = basic_rates ? ffs(basic_rates - 1) : 0;
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rate = &sband->bitrates[rates[0].idx];
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|
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for (i = 0; i < sband->n_bitrates; i++) {
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/* must be a basic rate */
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if (!(basic_rates & BIT(i)))
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continue;
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/* must not be faster than the data rate */
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if (sband->bitrates[i].bitrate > rate->bitrate)
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continue;
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/* maximum */
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if (sband->bitrates[baserate].bitrate <
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sband->bitrates[i].bitrate)
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baserate = i;
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}
|
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|
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info->control.rts_cts_rate_idx = baserate;
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}
|
|
|
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for (i = 0; i < max_rates; i++) {
|
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/*
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* make sure there's no valid rate following
|
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* an invalid one, just in case drivers don't
|
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* take the API seriously to stop at -1.
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|
*/
|
|
if (inval) {
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rates[i].idx = -1;
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continue;
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}
|
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if (rates[i].idx < 0) {
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inval = true;
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continue;
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}
|
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|
|
/*
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|
* For now assume MCS is already set up correctly, this
|
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* needs to be fixed.
|
|
*/
|
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if (rates[i].flags & IEEE80211_TX_RC_MCS) {
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WARN_ON(rates[i].idx > 76);
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|
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if (!(rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS) &&
|
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info->control.use_cts_prot)
|
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rates[i].flags |=
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IEEE80211_TX_RC_USE_CTS_PROTECT;
|
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continue;
|
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}
|
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|
|
if (rates[i].flags & IEEE80211_TX_RC_VHT_MCS) {
|
|
WARN_ON(ieee80211_rate_get_vht_mcs(&rates[i]) > 9);
|
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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 void rate_control_apply_mask(struct ieee80211_sub_if_data *sdata,
|
|
struct ieee80211_sta *sta,
|
|
struct ieee80211_supported_band *sband,
|
|
struct ieee80211_tx_info *info,
|
|
struct ieee80211_tx_rate *rates,
|
|
int max_rates)
|
|
{
|
|
enum nl80211_chan_width chan_width;
|
|
u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN];
|
|
bool has_mcs_mask;
|
|
u32 mask;
|
|
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.
|
|
*/
|
|
mask = sdata->rc_rateidx_mask[info->band];
|
|
has_mcs_mask = sdata->rc_has_mcs_mask[info->band];
|
|
if (mask == (1 << sband->n_bitrates) - 1 && !has_mcs_mask)
|
|
return;
|
|
|
|
if (has_mcs_mask)
|
|
memcpy(mcs_mask, sdata->rc_rateidx_mcs_mask[info->band],
|
|
sizeof(mcs_mask));
|
|
else
|
|
memset(mcs_mask, 0xff, sizeof(mcs_mask));
|
|
|
|
if (sta) {
|
|
/* Filter out rates that the STA does not support */
|
|
mask &= sta->supp_rates[info->band];
|
|
for (i = 0; i < sizeof(mcs_mask); i++)
|
|
mcs_mask[i] &= sta->ht_cap.mcs.rx_mask[i];
|
|
}
|
|
|
|
/*
|
|
* 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_idx_match_mask(&rates[i], sband, mask, chan_width,
|
|
mcs_mask);
|
|
}
|
|
}
|
|
|
|
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, info, dest, max_rates);
|
|
|
|
if (dest[0].idx < 0)
|
|
__rate_control_send_low(&sdata->local->hw, sband, sta, info);
|
|
|
|
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;
|
|
|
|
if (sta && test_sta_flag(sta, WLAN_STA_RATE_CONTROL)) {
|
|
ista = &sta->sta;
|
|
priv_sta = sta->rate_ctrl_priv;
|
|
}
|
|
|
|
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 (sdata->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)
|
|
return;
|
|
|
|
ref->ops->get_rate(ref->priv, ista, priv_sta, txrc);
|
|
|
|
if (sdata->local->hw.flags & IEEE80211_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 ieee80211_sta_rates *old = rcu_dereference(pubsta->rates);
|
|
|
|
rcu_assign_pointer(pubsta->rates, rates);
|
|
if (old)
|
|
kfree_rcu(old, rcu_head);
|
|
|
|
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 (local->hw.flags & IEEE80211_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(ref);
|
|
}
|
|
|