android_kernel_xiaomi_sm8350/drivers/net/wireless/rt2x00/rt2x00config.c
Ivo van Doorn 4789666e13 rt2x00: Hardcode TX ack timeout and consume time
The calculated values for the ACK timeout and ACK
consume time are different then the values as
used by the Legacy drivers.

After testing from James Ledwith it appeared that
the calculated values caused a high amount of TX
failures, and the values from the Legacy drivers
were the most optimal to prevent TX failure due to
excessive retries.

The symptoms of this problem:
 - Rate control module always falls back to 1Mbs
 - Low throughput when bitrate was fixed

Possible side-effects (not confirmed but highly likely)
 - Problems with DHCP
 - Broken connections due to lack of probe response

This should fix at least:
Kernel bugzilla reports: [13362], [13009], [9273]
Fedora bugzilla reports: [443203]
but possible some additional bugs as well.

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-09-09 11:18:14 -04:00

213 lines
6.2 KiB
C

/*
Copyright (C) 2004 - 2009 rt2x00 SourceForge Project
<http://rt2x00.serialmonkey.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the
Free Software Foundation, Inc.,
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/*
Module: rt2x00lib
Abstract: rt2x00 generic configuration routines.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include "rt2x00.h"
#include "rt2x00lib.h"
void rt2x00lib_config_intf(struct rt2x00_dev *rt2x00dev,
struct rt2x00_intf *intf,
enum nl80211_iftype type,
const u8 *mac, const u8 *bssid)
{
struct rt2x00intf_conf conf;
unsigned int flags = 0;
conf.type = type;
switch (type) {
case NL80211_IFTYPE_ADHOC:
case NL80211_IFTYPE_AP:
case NL80211_IFTYPE_MESH_POINT:
case NL80211_IFTYPE_WDS:
conf.sync = TSF_SYNC_BEACON;
break;
case NL80211_IFTYPE_STATION:
conf.sync = TSF_SYNC_INFRA;
break;
default:
conf.sync = TSF_SYNC_NONE;
break;
}
/*
* Note that when NULL is passed as address we will send
* 00:00:00:00:00 to the device to clear the address.
* This will prevent the device being confused when it wants
* to ACK frames or consideres itself associated.
*/
memset(&conf.mac, 0, sizeof(conf.mac));
if (mac)
memcpy(&conf.mac, mac, ETH_ALEN);
memset(&conf.bssid, 0, sizeof(conf.bssid));
if (bssid)
memcpy(&conf.bssid, bssid, ETH_ALEN);
flags |= CONFIG_UPDATE_TYPE;
if (mac || (!rt2x00dev->intf_ap_count && !rt2x00dev->intf_sta_count))
flags |= CONFIG_UPDATE_MAC;
if (bssid || (!rt2x00dev->intf_ap_count && !rt2x00dev->intf_sta_count))
flags |= CONFIG_UPDATE_BSSID;
rt2x00dev->ops->lib->config_intf(rt2x00dev, intf, &conf, flags);
}
void rt2x00lib_config_erp(struct rt2x00_dev *rt2x00dev,
struct rt2x00_intf *intf,
struct ieee80211_bss_conf *bss_conf)
{
struct rt2x00lib_erp erp;
memset(&erp, 0, sizeof(erp));
erp.short_preamble = bss_conf->use_short_preamble;
erp.cts_protection = bss_conf->use_cts_prot;
erp.slot_time = bss_conf->use_short_slot ? SHORT_SLOT_TIME : SLOT_TIME;
erp.sifs = SIFS;
erp.pifs = bss_conf->use_short_slot ? SHORT_PIFS : PIFS;
erp.difs = bss_conf->use_short_slot ? SHORT_DIFS : DIFS;
erp.eifs = bss_conf->use_short_slot ? SHORT_EIFS : EIFS;
erp.basic_rates = bss_conf->basic_rates;
erp.beacon_int = bss_conf->beacon_int;
/* Update global beacon interval time, this is needed for PS support */
rt2x00dev->beacon_int = bss_conf->beacon_int;
rt2x00dev->ops->lib->config_erp(rt2x00dev, &erp);
}
static inline
enum antenna rt2x00lib_config_antenna_check(enum antenna current_ant,
enum antenna default_ant)
{
if (current_ant != ANTENNA_SW_DIVERSITY)
return current_ant;
return (default_ant != ANTENNA_SW_DIVERSITY) ? default_ant : ANTENNA_B;
}
void rt2x00lib_config_antenna(struct rt2x00_dev *rt2x00dev,
struct antenna_setup config)
{
struct link_ant *ant = &rt2x00dev->link.ant;
struct antenna_setup *def = &rt2x00dev->default_ant;
struct antenna_setup *active = &rt2x00dev->link.ant.active;
/*
* Failsafe: Make sure we are not sending the
* ANTENNA_SW_DIVERSITY state to the driver.
* If that happens, fallback to hardware defaults,
* or our own default.
* If diversity handling is active for a particular antenna,
* we shouldn't overwrite that antenna.
* The calls to rt2x00lib_config_antenna_check()
* might have caused that we restore back to the already
* active setting. If that has happened we can quit.
*/
if (!(ant->flags & ANTENNA_RX_DIVERSITY))
config.rx = rt2x00lib_config_antenna_check(config.rx, def->rx);
else
config.rx = active->rx;
if (!(ant->flags & ANTENNA_TX_DIVERSITY))
config.tx = rt2x00lib_config_antenna_check(config.tx, def->tx);
else
config.tx = active->tx;
if (config.rx == active->rx && config.tx == active->tx)
return;
/*
* Antenna setup changes require the RX to be disabled,
* else the changes will be ignored by the device.
*/
if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF_LINK);
/*
* Write new antenna setup to device and reset the link tuner.
* The latter is required since we need to recalibrate the
* noise-sensitivity ratio for the new setup.
*/
rt2x00dev->ops->lib->config_ant(rt2x00dev, &config);
rt2x00link_reset_tuner(rt2x00dev, true);
memcpy(active, &config, sizeof(config));
if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON_LINK);
}
void rt2x00lib_config(struct rt2x00_dev *rt2x00dev,
struct ieee80211_conf *conf,
unsigned int ieee80211_flags)
{
struct rt2x00lib_conf libconf;
memset(&libconf, 0, sizeof(libconf));
libconf.conf = conf;
if (ieee80211_flags & IEEE80211_CONF_CHANGE_CHANNEL) {
if (conf_is_ht40(conf))
__set_bit(CONFIG_CHANNEL_HT40, &rt2x00dev->flags);
else
__clear_bit(CONFIG_CHANNEL_HT40, &rt2x00dev->flags);
memcpy(&libconf.rf,
&rt2x00dev->spec.channels[conf->channel->hw_value],
sizeof(libconf.rf));
memcpy(&libconf.channel,
&rt2x00dev->spec.channels_info[conf->channel->hw_value],
sizeof(libconf.channel));
}
/*
* Start configuration.
*/
rt2x00dev->ops->lib->config(rt2x00dev, &libconf, ieee80211_flags);
/*
* Some configuration changes affect the link quality
* which means we need to reset the link tuner.
*/
if (ieee80211_flags & IEEE80211_CONF_CHANGE_CHANNEL)
rt2x00link_reset_tuner(rt2x00dev, false);
rt2x00dev->curr_band = conf->channel->band;
rt2x00dev->tx_power = conf->power_level;
rt2x00dev->short_retry = conf->short_frame_max_tx_count;
rt2x00dev->long_retry = conf->long_frame_max_tx_count;
rt2x00dev->rx_status.band = conf->channel->band;
rt2x00dev->rx_status.freq = conf->channel->center_freq;
}