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ath9k_hw: optimize tx status descriptor processing

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Disassembly shows, that at least on MIPS, the compiler generates a lot of
memory accesses to the same location in the descriptor field parsing.
Since it is operating on uncached memory, this can be quite expensive in
this hot path.
Change the code a bit to help the compiler optimize it properly, and get
rid of some unused fields in the ath_tx_status struct.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Felix Fietkau
2010-10-15 20:03:30 +02:00
committed by John W. Linville
parent 45684c75f9
commit e0e9bc82fb
3 changed files with 86 additions and 95 deletions
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3
drivers/net/wireless/ath/ath9k/mac.h
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@@ -104,13 +104,11 @@ struct ath_tx_status {
u32 ts_tstamp;
u16 ts_seqnum;
u8 ts_status;
u8 ts_ratecode;
u8 ts_rateindex;
int8_t ts_rssi;
u8 ts_shortretry;
u8 ts_longretry;
u8 ts_virtcol;
u8 ts_antenna;
u8 ts_flags;
int8_t ts_rssi_ctl0;
int8_t ts_rssi_ctl1;
@@ -121,7 +119,6 @@ struct ath_tx_status {
u8 qid;
u16 desc_id;
u8 tid;
u8 pad[2];
u32 ba_low;
u32 ba_high;
u32 evm0;