diff options
author | Felix Fietkau <nbd@openwrt.org> | 2010-10-15 20:03:30 +0200 |
---|---|---|
committer | John W. Linville <linville@tuxdriver.com> | 2010-11-09 16:13:24 -0500 |
commit | e0e9bc82fb0813fd353b0abbba0f1d6a680cc77c (patch) | |
tree | d81c63dd8cb99cc29a6f53f5b5fca1eea860ddc8 | |
parent | 45684c75f9aa80eb477465bddcf79c9ad95206c7 (diff) |
ath9k_hw: optimize tx status descriptor processing
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>
-rw-r--r-- | drivers/net/wireless/ath/ath9k/ar9002_mac.c | 81 | ||||
-rw-r--r-- | drivers/net/wireless/ath/ath9k/ar9003_mac.c | 69 | ||||
-rw-r--r-- | drivers/net/wireless/ath/ath9k/mac.h | 3 |
3 files changed, 72 insertions, 81 deletions
diff --git a/drivers/net/wireless/ath/ath9k/ar9002_mac.c b/drivers/net/wireless/ath/ath9k/ar9002_mac.c index f5ed73dac25..3b4c52c9181 100644 --- a/drivers/net/wireless/ath/ath9k/ar9002_mac.c +++ b/drivers/net/wireless/ath/ath9k/ar9002_mac.c @@ -208,77 +208,68 @@ static int ar9002_hw_proc_txdesc(struct ath_hw *ah, void *ds, struct ath_tx_status *ts) { struct ar5416_desc *ads = AR5416DESC(ds); + u32 status; - if ((ads->ds_txstatus9 & AR_TxDone) == 0) + status = ACCESS_ONCE(ads->ds_txstatus9); + if ((status & AR_TxDone) == 0) return -EINPROGRESS; - ts->ts_seqnum = MS(ads->ds_txstatus9, AR_SeqNum); ts->ts_tstamp = ads->AR_SendTimestamp; ts->ts_status = 0; ts->ts_flags = 0; - if (ads->ds_txstatus1 & AR_FrmXmitOK) + if (status & AR_TxOpExceeded) + ts->ts_status |= ATH9K_TXERR_XTXOP; + ts->tid = MS(status, AR_TxTid); + ts->ts_rateindex = MS(status, AR_FinalTxIdx); + ts->ts_seqnum = MS(status, AR_SeqNum); + + status = ACCESS_ONCE(ads->ds_txstatus0); + ts->ts_rssi_ctl0 = MS(status, AR_TxRSSIAnt00); + ts->ts_rssi_ctl1 = MS(status, AR_TxRSSIAnt01); + ts->ts_rssi_ctl2 = MS(status, AR_TxRSSIAnt02); + if (status & AR_TxBaStatus) { + ts->ts_flags |= ATH9K_TX_BA; + ts->ba_low = ads->AR_BaBitmapLow; + ts->ba_high = ads->AR_BaBitmapHigh; + } + + status = ACCESS_ONCE(ads->ds_txstatus1); + if (status & AR_FrmXmitOK) ts->ts_status |= ATH9K_TX_ACKED; - if (ads->ds_txstatus1 & AR_ExcessiveRetries) + if (status & AR_ExcessiveRetries) ts->ts_status |= ATH9K_TXERR_XRETRY; - if (ads->ds_txstatus1 & AR_Filtered) + if (status & AR_Filtered) ts->ts_status |= ATH9K_TXERR_FILT; - if (ads->ds_txstatus1 & AR_FIFOUnderrun) { + if (status & AR_FIFOUnderrun) { ts->ts_status |= ATH9K_TXERR_FIFO; ath9k_hw_updatetxtriglevel(ah, true); } - if (ads->ds_txstatus9 & AR_TxOpExceeded) - ts->ts_status |= ATH9K_TXERR_XTXOP; - if (ads->ds_txstatus1 & AR_TxTimerExpired) + if (status & AR_TxTimerExpired) ts->ts_status |= ATH9K_TXERR_TIMER_EXPIRED; - - if (ads->ds_txstatus1 & AR_DescCfgErr) + if (status & AR_DescCfgErr) ts->ts_flags |= ATH9K_TX_DESC_CFG_ERR; - if (ads->ds_txstatus1 & AR_TxDataUnderrun) { + if (status & AR_TxDataUnderrun) { ts->ts_flags |= ATH9K_TX_DATA_UNDERRUN; ath9k_hw_updatetxtriglevel(ah, true); } - if (ads->ds_txstatus1 & AR_TxDelimUnderrun) { + if (status & AR_TxDelimUnderrun) { ts->ts_flags |= ATH9K_TX_DELIM_UNDERRUN; ath9k_hw_updatetxtriglevel(ah, true); } - if (ads->ds_txstatus0 & AR_TxBaStatus) { - ts->ts_flags |= ATH9K_TX_BA; - ts->ba_low = ads->AR_BaBitmapLow; - ts->ba_high = ads->AR_BaBitmapHigh; - } + ts->ts_shortretry = MS(status, AR_RTSFailCnt); + ts->ts_longretry = MS(status, AR_DataFailCnt); + ts->ts_virtcol = MS(status, AR_VirtRetryCnt); - ts->ts_rateindex = MS(ads->ds_txstatus9, AR_FinalTxIdx); - switch (ts->ts_rateindex) { - case 0: - ts->ts_ratecode = MS(ads->ds_ctl3, AR_XmitRate0); - break; - case 1: - ts->ts_ratecode = MS(ads->ds_ctl3, AR_XmitRate1); - break; - case 2: - ts->ts_ratecode = MS(ads->ds_ctl3, AR_XmitRate2); - break; - case 3: - ts->ts_ratecode = MS(ads->ds_ctl3, AR_XmitRate3); - break; - } + status = ACCESS_ONCE(ads->ds_txstatus5); + ts->ts_rssi = MS(status, AR_TxRSSICombined); + ts->ts_rssi_ext0 = MS(status, AR_TxRSSIAnt10); + ts->ts_rssi_ext1 = MS(status, AR_TxRSSIAnt11); + ts->ts_rssi_ext2 = MS(status, AR_TxRSSIAnt12); - ts->ts_rssi = MS(ads->ds_txstatus5, AR_TxRSSICombined); - ts->ts_rssi_ctl0 = MS(ads->ds_txstatus0, AR_TxRSSIAnt00); - ts->ts_rssi_ctl1 = MS(ads->ds_txstatus0, AR_TxRSSIAnt01); - ts->ts_rssi_ctl2 = MS(ads->ds_txstatus0, AR_TxRSSIAnt02); - ts->ts_rssi_ext0 = MS(ads->ds_txstatus5, AR_TxRSSIAnt10); - ts->ts_rssi_ext1 = MS(ads->ds_txstatus5, AR_TxRSSIAnt11); - ts->ts_rssi_ext2 = MS(ads->ds_txstatus5, AR_TxRSSIAnt12); ts->evm0 = ads->AR_TxEVM0; ts->evm1 = ads->AR_TxEVM1; ts->evm2 = ads->AR_TxEVM2; - ts->ts_shortretry = MS(ads->ds_txstatus1, AR_RTSFailCnt); - ts->ts_longretry = MS(ads->ds_txstatus1, AR_DataFailCnt); - ts->ts_virtcol = MS(ads->ds_txstatus1, AR_VirtRetryCnt); - ts->tid = MS(ads->ds_txstatus9, AR_TxTid); - ts->ts_antenna = 0; return 0; } diff --git a/drivers/net/wireless/ath/ath9k/ar9003_mac.c b/drivers/net/wireless/ath/ath9k/ar9003_mac.c index 3b424ca1ba8..10c812e353a 100644 --- a/drivers/net/wireless/ath/ath9k/ar9003_mac.c +++ b/drivers/net/wireless/ath/ath9k/ar9003_mac.c @@ -237,10 +237,12 @@ static int ar9003_hw_proc_txdesc(struct ath_hw *ah, void *ds, struct ath_tx_status *ts) { struct ar9003_txs *ads; + u32 status; ads = &ah->ts_ring[ah->ts_tail]; - if ((ads->status8 & AR_TxDone) == 0) + status = ACCESS_ONCE(ads->status8); + if ((status & AR_TxDone) == 0) return -EINPROGRESS; ah->ts_tail = (ah->ts_tail + 1) % ah->ts_size; @@ -253,57 +255,58 @@ static int ar9003_hw_proc_txdesc(struct ath_hw *ah, void *ds, return -EIO; } + if (status & AR_TxOpExceeded) + ts->ts_status |= ATH9K_TXERR_XTXOP; + ts->ts_rateindex = MS(status, AR_FinalTxIdx); + ts->ts_seqnum = MS(status, AR_SeqNum); + ts->tid = MS(status, AR_TxTid); + ts->qid = MS(ads->ds_info, AR_TxQcuNum); ts->desc_id = MS(ads->status1, AR_TxDescId); - ts->ts_seqnum = MS(ads->status8, AR_SeqNum); ts->ts_tstamp = ads->status4; ts->ts_status = 0; ts->ts_flags = 0; - if (ads->status3 & AR_ExcessiveRetries) + status = ACCESS_ONCE(ads->status2); + ts->ts_rssi_ctl0 = MS(status, AR_TxRSSIAnt00); + ts->ts_rssi_ctl1 = MS(status, AR_TxRSSIAnt01); + ts->ts_rssi_ctl2 = MS(status, AR_TxRSSIAnt02); + if (status & AR_TxBaStatus) { + ts->ts_flags |= ATH9K_TX_BA; + ts->ba_low = ads->status5; + ts->ba_high = ads->status6; + } + + status = ACCESS_ONCE(ads->status3); + if (status & AR_ExcessiveRetries) ts->ts_status |= ATH9K_TXERR_XRETRY; - if (ads->status3 & AR_Filtered) + if (status & AR_Filtered) ts->ts_status |= ATH9K_TXERR_FILT; - if (ads->status3 & AR_FIFOUnderrun) { + if (status & AR_FIFOUnderrun) { ts->ts_status |= ATH9K_TXERR_FIFO; ath9k_hw_updatetxtriglevel(ah, true); } - if (ads->status8 & AR_TxOpExceeded) - ts->ts_status |= ATH9K_TXERR_XTXOP; - if (ads->status3 & AR_TxTimerExpired) + if (status & AR_TxTimerExpired) ts->ts_status |= ATH9K_TXERR_TIMER_EXPIRED; - - if (ads->status3 & AR_DescCfgErr) + if (status & AR_DescCfgErr) ts->ts_flags |= ATH9K_TX_DESC_CFG_ERR; - if (ads->status3 & AR_TxDataUnderrun) { + if (status & AR_TxDataUnderrun) { ts->ts_flags |= ATH9K_TX_DATA_UNDERRUN; ath9k_hw_updatetxtriglevel(ah, true); } - if (ads->status3 & AR_TxDelimUnderrun) { + if (status & AR_TxDelimUnderrun) { ts->ts_flags |= ATH9K_TX_DELIM_UNDERRUN; ath9k_hw_updatetxtriglevel(ah, true); } - if (ads->status2 & AR_TxBaStatus) { - ts->ts_flags |= ATH9K_TX_BA; - ts->ba_low = ads->status5; - ts->ba_high = ads->status6; - } - - ts->ts_rateindex = MS(ads->status8, AR_FinalTxIdx); - - ts->ts_rssi = MS(ads->status7, AR_TxRSSICombined); - ts->ts_rssi_ctl0 = MS(ads->status2, AR_TxRSSIAnt00); - ts->ts_rssi_ctl1 = MS(ads->status2, AR_TxRSSIAnt01); - ts->ts_rssi_ctl2 = MS(ads->status2, AR_TxRSSIAnt02); - ts->ts_rssi_ext0 = MS(ads->status7, AR_TxRSSIAnt10); - ts->ts_rssi_ext1 = MS(ads->status7, AR_TxRSSIAnt11); - ts->ts_rssi_ext2 = MS(ads->status7, AR_TxRSSIAnt12); - ts->ts_shortretry = MS(ads->status3, AR_RTSFailCnt); - ts->ts_longretry = MS(ads->status3, AR_DataFailCnt); - ts->ts_virtcol = MS(ads->status3, AR_VirtRetryCnt); - ts->ts_antenna = 0; - - ts->tid = MS(ads->status8, AR_TxTid); + ts->ts_shortretry = MS(status, AR_RTSFailCnt); + ts->ts_longretry = MS(status, AR_DataFailCnt); + ts->ts_virtcol = MS(status, AR_VirtRetryCnt); + + status = ACCESS_ONCE(ads->status7); + ts->ts_rssi = MS(status, AR_TxRSSICombined); + ts->ts_rssi_ext0 = MS(status, AR_TxRSSIAnt10); + ts->ts_rssi_ext1 = MS(status, AR_TxRSSIAnt11); + ts->ts_rssi_ext2 = MS(status, AR_TxRSSIAnt12); memset(ads, 0, sizeof(*ads)); diff --git a/drivers/net/wireless/ath/ath9k/mac.h b/drivers/net/wireless/ath/ath9k/mac.h index 538c676e799..fdc25074ca1 100644 --- a/drivers/net/wireless/ath/ath9k/mac.h +++ b/drivers/net/wireless/ath/ath9k/mac.h @@ -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; |