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ath5k: add a few fixes that improve performance

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git-svn-id: svn://svn.openwrt.org/openwrt/trunk@26564 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
nbd
2011-04-09 21:11:06 +00:00
parent e5c2ddb8ef
commit 823f142ee2
3 changed files with 147 additions and 0 deletions
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82
package/mac80211/patches/461-ath5k_fix_short_preamble_dur.patch Normal file
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@@ -0,0 +1,82 @@
--- a/drivers/net/wireless/ath/ath5k/ath5k.h
+++ b/drivers/net/wireless/ath/ath5k/ath5k.h
@@ -1233,7 +1233,7 @@ int ath5k_eeprom_read_mac(struct ath5k_h
/* Protocol Control Unit Functions */
/* Helpers */
int ath5k_hw_get_frame_duration(struct ath5k_hw *ah,
- int len, struct ieee80211_rate *rate);
+ int len, struct ieee80211_rate *rate, bool shortpre);
unsigned int ath5k_hw_get_default_slottime(struct ath5k_hw *ah);
unsigned int ath5k_hw_get_default_sifs(struct ath5k_hw *ah);
extern int ath5k_hw_set_opmode(struct ath5k_hw *ah, enum nl80211_iftype opmode);
--- a/drivers/net/wireless/ath/ath5k/pcu.c
+++ b/drivers/net/wireless/ath/ath5k/pcu.c
@@ -75,7 +75,7 @@ static const unsigned int ack_rates_high
* bwmodes.
*/
int ath5k_hw_get_frame_duration(struct ath5k_hw *ah,
- int len, struct ieee80211_rate *rate)
+ int len, struct ieee80211_rate *rate, bool shortpre)
{
struct ath5k_softc *sc = ah->ah_sc;
int sifs, preamble, plcp_bits, sym_time;
@@ -84,9 +84,15 @@ int ath5k_hw_get_frame_duration(struct a
/* Fallback */
if (!ah->ah_bwmode) {
- dur = ieee80211_generic_frame_duration(sc->hw,
- NULL, len, rate);
- return le16_to_cpu(dur);
+ __le16 raw_dur = ieee80211_generic_frame_duration(sc->hw,
+ NULL, len, rate);
+
+ /* subtract difference between long and short preamble */
+ dur = le16_to_cpu(raw_dur);
+ if (shortpre)
+ dur -= 96;
+
+ return dur;
}
bitrate = rate->bitrate;
@@ -263,27 +269,14 @@ static inline void ath5k_hw_write_rate_d
* actual rate for this rate. See mac80211 tx.c
* ieee80211_duration() for a brief description of
* what rate we should choose to TX ACKs. */
- tx_time = ath5k_hw_get_frame_duration(ah, 10, rate);
+ tx_time = ath5k_hw_get_frame_duration(ah, 10, rate, false);
ath5k_hw_reg_write(ah, tx_time, reg);
if (!(rate->flags & IEEE80211_RATE_SHORT_PREAMBLE))
continue;
- /*
- * We're not distinguishing short preamble here,
- * This is true, all we'll get is a longer value here
- * which is not necessarilly bad. We could use
- * export ieee80211_frame_duration() but that needs to be
- * fixed first to be properly used by mac802111 drivers:
- *
- * - remove erp stuff and let the routine figure ofdm
- * erp rates
- * - remove passing argument ieee80211_local as
- * drivers don't have access to it
- * - move drivers using ieee80211_generic_frame_duration()
- * to this
- */
+ tx_time = ath5k_hw_get_frame_duration(ah, 10, rate, true);
ath5k_hw_reg_write(ah, tx_time,
reg + (AR5K_SET_SHORT_PREAMBLE << 2));
}
--- a/drivers/net/wireless/ath/ath5k/qcu.c
+++ b/drivers/net/wireless/ath/ath5k/qcu.c
@@ -550,7 +550,7 @@ int ath5k_hw_set_ifs_intervals(struct at
else
rate = &sc->sbands[IEEE80211_BAND_2GHZ].bitrates[0];
- ack_tx_time = ath5k_hw_get_frame_duration(ah, 10, rate);
+ ack_tx_time = ath5k_hw_get_frame_duration(ah, 10, rate, false);
/* ack_tx_time includes an SIFS already */
eifs = ack_tx_time + sifs + 2 * slot_time;