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ath: Speedup key set/reset ops for HTC driver 

By enabling buffered register write for ath9k_htc driver
avoids unnecessary dissociation while rekeying phase under
heavy traffic exchange.

Signed-off-by: Rajkumar Manoharan <rmanoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Rajkumar Manoharan 2011-03-15 19:55:38 +05:30 committed by John W. Linville
parent 81544026e4
commit b0a9ede228
1 changed files with 32 additions and 0 deletions
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32
drivers/net/wireless/ath/key.c
View File

@ -23,6 +23,14 @@
#define REG_READ (common->ops->read)
#define REG_WRITE(_ah, _reg, _val) (common->ops->write)(_ah, _val, _reg)
#define ENABLE_REGWRITE_BUFFER(_ah) \
if (common->ops->enable_write_buffer) \
common->ops->enable_write_buffer((_ah));
#define REGWRITE_BUFFER_FLUSH(_ah) \
if (common->ops->write_flush) \
common->ops->write_flush((_ah));
#define IEEE80211_WEP_NKID 4 /* number of key ids */
@ -42,6 +50,8 @@ bool ath_hw_keyreset(struct ath_common *common, u16 entry)
keyType = REG_READ(ah, AR_KEYTABLE_TYPE(entry));
ENABLE_REGWRITE_BUFFER(ah);
REG_WRITE(ah, AR_KEYTABLE_KEY0(entry), 0);
REG_WRITE(ah, AR_KEYTABLE_KEY1(entry), 0);
REG_WRITE(ah, AR_KEYTABLE_KEY2(entry), 0);
@ -66,6 +76,8 @@ bool ath_hw_keyreset(struct ath_common *common, u16 entry)
}
REGWRITE_BUFFER_FLUSH(ah);
return true;
}
EXPORT_SYMBOL(ath_hw_keyreset);
@ -104,9 +116,13 @@ static bool ath_hw_keysetmac(struct ath_common *common,
} else {
macLo = macHi = 0;
}
ENABLE_REGWRITE_BUFFER(ah);
REG_WRITE(ah, AR_KEYTABLE_MAC0(entry), macLo);
REG_WRITE(ah, AR_KEYTABLE_MAC1(entry), macHi | unicast_flag);
REGWRITE_BUFFER_FLUSH(ah);
return true;
}
@ -223,6 +239,8 @@ static bool ath_hw_set_keycache_entry(struct ath_common *common, u16 entry,
mic3 = get_unaligned_le16(k->kv_txmic + 0) & 0xffff;
mic4 = get_unaligned_le32(k->kv_txmic + 4);
ENABLE_REGWRITE_BUFFER(ah);
/* Write RX[31:0] and TX[31:16] */
REG_WRITE(ah, AR_KEYTABLE_KEY0(micentry), mic0);
REG_WRITE(ah, AR_KEYTABLE_KEY1(micentry), mic1);
@ -236,6 +254,8 @@ static bool ath_hw_set_keycache_entry(struct ath_common *common, u16 entry,
REG_WRITE(ah, AR_KEYTABLE_TYPE(micentry),
AR_KEYTABLE_TYPE_CLR);
REGWRITE_BUFFER_FLUSH(ah);
} else {
/*
* TKIP uses four key cache entries (two for group
@ -258,6 +278,8 @@ static bool ath_hw_set_keycache_entry(struct ath_common *common, u16 entry,
mic0 = get_unaligned_le32(k->kv_mic + 0);
mic2 = get_unaligned_le32(k->kv_mic + 4);
ENABLE_REGWRITE_BUFFER(ah);
/* Write MIC key[31:0] */
REG_WRITE(ah, AR_KEYTABLE_KEY0(micentry), mic0);
REG_WRITE(ah, AR_KEYTABLE_KEY1(micentry), 0);
@ -270,8 +292,12 @@ static bool ath_hw_set_keycache_entry(struct ath_common *common, u16 entry,
REG_WRITE(ah, AR_KEYTABLE_KEY4(micentry), 0);
REG_WRITE(ah, AR_KEYTABLE_TYPE(micentry),
AR_KEYTABLE_TYPE_CLR);
REGWRITE_BUFFER_FLUSH(ah);
}
ENABLE_REGWRITE_BUFFER(ah);
/* MAC address registers are reserved for the MIC entry */
REG_WRITE(ah, AR_KEYTABLE_MAC0(micentry), 0);
REG_WRITE(ah, AR_KEYTABLE_MAC1(micentry), 0);
@ -283,7 +309,11 @@ static bool ath_hw_set_keycache_entry(struct ath_common *common, u16 entry,
*/
REG_WRITE(ah, AR_KEYTABLE_KEY0(entry), key0);
REG_WRITE(ah, AR_KEYTABLE_KEY1(entry), key1);
REGWRITE_BUFFER_FLUSH(ah);
} else {
ENABLE_REGWRITE_BUFFER(ah);
/* Write key[47:0] */
REG_WRITE(ah, AR_KEYTABLE_KEY0(entry), key0);
REG_WRITE(ah, AR_KEYTABLE_KEY1(entry), key1);
@ -296,6 +326,8 @@ static bool ath_hw_set_keycache_entry(struct ath_common *common, u16 entry,
REG_WRITE(ah, AR_KEYTABLE_KEY4(entry), key4);
REG_WRITE(ah, AR_KEYTABLE_TYPE(entry), keyType);
REGWRITE_BUFFER_FLUSH(ah);
/* Write MAC address for the entry */
(void) ath_hw_keysetmac(common, entry, mac);
}