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ath5k: Implement mac80211 callback set_coverage_class

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The callback sets slot time as specified in IEEE 802.11-2007 section
17.3.8.6 (for 20MHz channels only for now) and raises ACK and CTS
timeouts accordingly. The values are persistent, they are restored after
device reset.

Signed-off-by: Lukas Turek <8an@praha12.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Lukáš Turek 2009-12-21 22:50:51 +01:00 committed by John W. Linville
parent 3578e6ebb3
commit 6e08d228b6
4 changed files with 85 additions and 0 deletions
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2
drivers/net/wireless/ath/ath5k/ath5k.h
View file

@ -1063,6 +1063,7 @@ struct ath5k_hw {
u32 ah_cw_min;
u32 ah_cw_max;
u32 ah_limit_tx_retries;
u8 ah_coverage_class;
/* Antenna Control */
u32 ah_ant_ctl[AR5K_EEPROM_N_MODES][AR5K_ANT_MAX];
@ -1200,6 +1201,7 @@ extern bool ath5k_eeprom_is_hb63(struct ath5k_hw *ah);
/* Protocol Control Unit Functions */
extern int ath5k_hw_set_opmode(struct ath5k_hw *ah);
extern void ath5k_hw_set_coverage_class(struct ath5k_hw *ah, u8 coverage_class);
/* BSSID Functions */
extern int ath5k_hw_set_lladdr(struct ath5k_hw *ah, const u8 *mac);
extern void ath5k_hw_set_associd(struct ath5k_hw *ah);

22
drivers/net/wireless/ath/ath5k/base.c
View file

@ -254,6 +254,8 @@ static void ath5k_bss_info_changed(struct ieee80211_hw *hw,
u32 changes);
static void ath5k_sw_scan_start(struct ieee80211_hw *hw);
static void ath5k_sw_scan_complete(struct ieee80211_hw *hw);
static void ath5k_set_coverage_class(struct ieee80211_hw *hw,
u8 coverage_class);
static const struct ieee80211_ops ath5k_hw_ops = {
.tx = ath5k_tx,
@ -274,6 +276,7 @@ static const struct ieee80211_ops ath5k_hw_ops = {
.bss_info_changed = ath5k_bss_info_changed,
.sw_scan_start = ath5k_sw_scan_start,
.sw_scan_complete = ath5k_sw_scan_complete,
.set_coverage_class = ath5k_set_coverage_class,
};
/*
@ -3262,3 +3265,22 @@ static void ath5k_sw_scan_complete(struct ieee80211_hw *hw)
ath5k_hw_set_ledstate(sc->ah, sc->assoc ?
AR5K_LED_ASSOC : AR5K_LED_INIT);
}
/**
* ath5k_set_coverage_class - Set IEEE 802.11 coverage class
*
* @hw: struct ieee80211_hw pointer
* @coverage_class: IEEE 802.11 coverage class number
*
* Mac80211 callback. Sets slot time, ACK timeout and CTS timeout for given
* coverage class. The values are persistent, they are restored after device
* reset.
*/
static void ath5k_set_coverage_class(struct ieee80211_hw *hw, u8 coverage_class)
{
struct ath5k_softc *sc = hw->priv;
mutex_lock(&sc->lock);
ath5k_hw_set_coverage_class(sc->ah, coverage_class);
mutex_unlock(&sc->lock);
}

57
drivers/net/wireless/ath/ath5k/pcu.c
View file

@ -285,6 +285,42 @@ unsigned int ath5k_hw_get_clockrate(struct ath5k_hw *ah)
return clock;
}
/**
* ath5k_hw_get_default_slottime - Get the default slot time for current mode
*
* @ah: The &struct ath5k_hw
*/
unsigned int ath5k_hw_get_default_slottime(struct ath5k_hw *ah)
{
struct ieee80211_channel *channel = ah->ah_current_channel;
if (channel->hw_value & CHANNEL_TURBO)
return 6; /* both turbo modes */
if (channel->hw_value & CHANNEL_CCK)
return 20; /* 802.11b */
return 9; /* 802.11 a/g */
}
/**
* ath5k_hw_get_default_sifs - Get the default SIFS for current mode
*
* @ah: The &struct ath5k_hw
*/
unsigned int ath5k_hw_get_default_sifs(struct ath5k_hw *ah)
{
struct ieee80211_channel *channel = ah->ah_current_channel;
if (channel->hw_value & CHANNEL_TURBO)
return 8; /* both turbo modes */
if (channel->hw_value & CHANNEL_5GHZ)
return 16; /* 802.11a */
return 10; /* 802.11 b/g */
}
/**
* ath5k_hw_set_lladdr - Set station id
*
@ -1094,3 +1130,24 @@ int ath5k_hw_set_key_lladdr(struct ath5k_hw *ah, u16 entry, const u8 *mac)
return 0;
}
/**
* ath5k_hw_set_coverage_class - Set IEEE 802.11 coverage class
*
* @ah: The &struct ath5k_hw
* @coverage_class: IEEE 802.11 coverage class number
*
* Sets slot time, ACK timeout and CTS timeout for given coverage class.
*/
void ath5k_hw_set_coverage_class(struct ath5k_hw *ah, u8 coverage_class)
{
/* As defined by IEEE 802.11-2007 17.3.8.6 */
int slot_time = ath5k_hw_get_default_slottime(ah) + 3 * coverage_class;
int ack_timeout = ath5k_hw_get_default_sifs(ah) + slot_time;
int cts_timeout = ack_timeout;
ath5k_hw_set_slot_time(ah, slot_time);
ath5k_hw_set_ack_timeout(ah, ack_timeout);
ath5k_hw_set_cts_timeout(ah, cts_timeout);
ah->ah_coverage_class = coverage_class;
}

4
drivers/net/wireless/ath/ath5k/reset.c
View file

@ -1316,6 +1316,10 @@ int ath5k_hw_reset(struct ath5k_hw *ah, enum nl80211_iftype op_mode,
/* Restore antenna mode */
ath5k_hw_set_antenna_mode(ah, ah->ah_ant_mode);
/* Restore slot time and ACK timeouts */
if (ah->ah_coverage_class > 0)
ath5k_hw_set_coverage_class(ah, ah->ah_coverage_class);
/*
* Configure QCUs/DCUs
*/