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linux/drivers/net/wireless/ath/ath9k/ar9002_mac.c
Felix Fietkau e0e9bc82fb 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>
2010-11-09 16:13:24 -05:00

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/*
* Copyright (c) 2008-2009 Atheros Communications Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "hw.h"
#define AR_BufLen 0x00000fff
static void ar9002_hw_rx_enable(struct ath_hw *ah)
{
REG_WRITE(ah, AR_CR, AR_CR_RXE);
}
static void ar9002_hw_set_desc_link(void *ds, u32 ds_link)
{
((struct ath_desc*) ds)->ds_link = ds_link;
}
static void ar9002_hw_get_desc_link(void *ds, u32 **ds_link)
{
*ds_link = &((struct ath_desc *)ds)->ds_link;
}
static bool ar9002_hw_get_isr(struct ath_hw *ah, enum ath9k_int *masked)
{
u32 isr = 0;
u32 mask2 = 0;
struct ath9k_hw_capabilities *pCap = &ah->caps;
u32 sync_cause = 0;
bool fatal_int = false;
struct ath_common *common = ath9k_hw_common(ah);
if (!AR_SREV_9100(ah)) {
if (REG_READ(ah, AR_INTR_ASYNC_CAUSE) & AR_INTR_MAC_IRQ) {
if ((REG_READ(ah, AR_RTC_STATUS) & AR_RTC_STATUS_M)
== AR_RTC_STATUS_ON) {
isr = REG_READ(ah, AR_ISR);
}
}
sync_cause = REG_READ(ah, AR_INTR_SYNC_CAUSE) &
AR_INTR_SYNC_DEFAULT;
*masked = 0;
if (!isr && !sync_cause)
return false;
} else {
*masked = 0;
isr = REG_READ(ah, AR_ISR);
}
if (isr) {
if (isr & AR_ISR_BCNMISC) {
u32 isr2;
isr2 = REG_READ(ah, AR_ISR_S2);
if (isr2 & AR_ISR_S2_TIM)
mask2 |= ATH9K_INT_TIM;
if (isr2 & AR_ISR_S2_DTIM)
mask2 |= ATH9K_INT_DTIM;
if (isr2 & AR_ISR_S2_DTIMSYNC)
mask2 |= ATH9K_INT_DTIMSYNC;
if (isr2 & (AR_ISR_S2_CABEND))
mask2 |= ATH9K_INT_CABEND;
if (isr2 & AR_ISR_S2_GTT)
mask2 |= ATH9K_INT_GTT;
if (isr2 & AR_ISR_S2_CST)
mask2 |= ATH9K_INT_CST;
if (isr2 & AR_ISR_S2_TSFOOR)
mask2 |= ATH9K_INT_TSFOOR;
}
isr = REG_READ(ah, AR_ISR_RAC);
if (isr == 0xffffffff) {
*masked = 0;
return false;
}
*masked = isr & ATH9K_INT_COMMON;
if (isr & (AR_ISR_RXMINTR | AR_ISR_RXINTM |
AR_ISR_RXOK | AR_ISR_RXERR))
*masked |= ATH9K_INT_RX;
if (isr &
(AR_ISR_TXOK | AR_ISR_TXDESC | AR_ISR_TXERR |
AR_ISR_TXEOL)) {
u32 s0_s, s1_s;
*masked |= ATH9K_INT_TX;
s0_s = REG_READ(ah, AR_ISR_S0_S);
ah->intr_txqs |= MS(s0_s, AR_ISR_S0_QCU_TXOK);
ah->intr_txqs |= MS(s0_s, AR_ISR_S0_QCU_TXDESC);
s1_s = REG_READ(ah, AR_ISR_S1_S);
ah->intr_txqs |= MS(s1_s, AR_ISR_S1_QCU_TXERR);
ah->intr_txqs |= MS(s1_s, AR_ISR_S1_QCU_TXEOL);
}
if (isr & AR_ISR_RXORN) {
ath_print(common, ATH_DBG_INTERRUPT,
"receive FIFO overrun interrupt\n");
}
*masked |= mask2;
}
if (AR_SREV_9100(ah))
return true;
if (isr & AR_ISR_GENTMR) {
u32 s5_s;
s5_s = REG_READ(ah, AR_ISR_S5_S);
ah->intr_gen_timer_trigger =
MS(s5_s, AR_ISR_S5_GENTIMER_TRIG);
ah->intr_gen_timer_thresh =
MS(s5_s, AR_ISR_S5_GENTIMER_THRESH);
if (ah->intr_gen_timer_trigger)
*masked |= ATH9K_INT_GENTIMER;
if ((s5_s & AR_ISR_S5_TIM_TIMER) &&
!(pCap->hw_caps & ATH9K_HW_CAP_AUTOSLEEP))
*masked |= ATH9K_INT_TIM_TIMER;
}
if (sync_cause) {
fatal_int =
(sync_cause &
(AR_INTR_SYNC_HOST1_FATAL | AR_INTR_SYNC_HOST1_PERR))
? true : false;
if (fatal_int) {
if (sync_cause & AR_INTR_SYNC_HOST1_FATAL) {
ath_print(common, ATH_DBG_ANY,
"received PCI FATAL interrupt\n");
}
if (sync_cause & AR_INTR_SYNC_HOST1_PERR) {
ath_print(common, ATH_DBG_ANY,
"received PCI PERR interrupt\n");
}
*masked |= ATH9K_INT_FATAL;
}
if (sync_cause & AR_INTR_SYNC_RADM_CPL_TIMEOUT) {
ath_print(common, ATH_DBG_INTERRUPT,
"AR_INTR_SYNC_RADM_CPL_TIMEOUT\n");
REG_WRITE(ah, AR_RC, AR_RC_HOSTIF);
REG_WRITE(ah, AR_RC, 0);
*masked |= ATH9K_INT_FATAL;
}
if (sync_cause & AR_INTR_SYNC_LOCAL_TIMEOUT) {
ath_print(common, ATH_DBG_INTERRUPT,
"AR_INTR_SYNC_LOCAL_TIMEOUT\n");
}
REG_WRITE(ah, AR_INTR_SYNC_CAUSE_CLR, sync_cause);
(void) REG_READ(ah, AR_INTR_SYNC_CAUSE_CLR);
}
return true;
}
static void ar9002_hw_fill_txdesc(struct ath_hw *ah, void *ds, u32 seglen,
bool is_firstseg, bool is_lastseg,
const void *ds0, dma_addr_t buf_addr,
unsigned int qcu)
{
struct ar5416_desc *ads = AR5416DESC(ds);
ads->ds_data = buf_addr;
if (is_firstseg) {
ads->ds_ctl1 |= seglen | (is_lastseg ? 0 : AR_TxMore);
} else if (is_lastseg) {
ads->ds_ctl0 = 0;
ads->ds_ctl1 = seglen;
ads->ds_ctl2 = AR5416DESC_CONST(ds0)->ds_ctl2;
ads->ds_ctl3 = AR5416DESC_CONST(ds0)->ds_ctl3;
} else {
ads->ds_ctl0 = 0;
ads->ds_ctl1 = seglen | AR_TxMore;
ads->ds_ctl2 = 0;
ads->ds_ctl3 = 0;
}
ads->ds_txstatus0 = ads->ds_txstatus1 = 0;
ads->ds_txstatus2 = ads->ds_txstatus3 = 0;
ads->ds_txstatus4 = ads->ds_txstatus5 = 0;
ads->ds_txstatus6 = ads->ds_txstatus7 = 0;
ads->ds_txstatus8 = ads->ds_txstatus9 = 0;
}
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;
status = ACCESS_ONCE(ads->ds_txstatus9);
if ((status & AR_TxDone) == 0)
return -EINPROGRESS;
ts->ts_tstamp = ads->AR_SendTimestamp;
ts->ts_status = 0;
ts->ts_flags = 0;
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 (status & AR_ExcessiveRetries)
ts->ts_status |= ATH9K_TXERR_XRETRY;
if (status & AR_Filtered)
ts->ts_status |= ATH9K_TXERR_FILT;
if (status & AR_FIFOUnderrun) {
ts->ts_status |= ATH9K_TXERR_FIFO;
ath9k_hw_updatetxtriglevel(ah, true);
}
if (status & AR_TxTimerExpired)
ts->ts_status |= ATH9K_TXERR_TIMER_EXPIRED;
if (status & AR_DescCfgErr)
ts->ts_flags |= ATH9K_TX_DESC_CFG_ERR;
if (status & AR_TxDataUnderrun) {
ts->ts_flags |= ATH9K_TX_DATA_UNDERRUN;
ath9k_hw_updatetxtriglevel(ah, true);
}
if (status & AR_TxDelimUnderrun) {
ts->ts_flags |= ATH9K_TX_DELIM_UNDERRUN;
ath9k_hw_updatetxtriglevel(ah, true);
}
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->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->evm0 = ads->AR_TxEVM0;
ts->evm1 = ads->AR_TxEVM1;
ts->evm2 = ads->AR_TxEVM2;
return 0;
}
static void ar9002_hw_set11n_txdesc(struct ath_hw *ah, void *ds,
u32 pktLen, enum ath9k_pkt_type type,
u32 txPower, u32 keyIx,
enum ath9k_key_type keyType, u32 flags)
{
struct ar5416_desc *ads = AR5416DESC(ds);
txPower += ah->txpower_indexoffset;
if (txPower > 63)
txPower = 63;
ads->ds_ctl0 = (pktLen & AR_FrameLen)
| (flags & ATH9K_TXDESC_VMF ? AR_VirtMoreFrag : 0)
| SM(txPower, AR_XmitPower)
| (flags & ATH9K_TXDESC_VEOL ? AR_VEOL : 0)
| (flags & ATH9K_TXDESC_CLRDMASK ? AR_ClrDestMask : 0)
| (flags & ATH9K_TXDESC_INTREQ ? AR_TxIntrReq : 0)
| (keyIx != ATH9K_TXKEYIX_INVALID ? AR_DestIdxValid : 0);
ads->ds_ctl1 =
(keyIx != ATH9K_TXKEYIX_INVALID ? SM(keyIx, AR_DestIdx) : 0)
| SM(type, AR_FrameType)
| (flags & ATH9K_TXDESC_NOACK ? AR_NoAck : 0)
| (flags & ATH9K_TXDESC_EXT_ONLY ? AR_ExtOnly : 0)
| (flags & ATH9K_TXDESC_EXT_AND_CTL ? AR_ExtAndCtl : 0);
ads->ds_ctl6 = SM(keyType, AR_EncrType);
if (AR_SREV_9285(ah) || AR_SREV_9271(ah)) {
ads->ds_ctl8 = 0;
ads->ds_ctl9 = 0;
ads->ds_ctl10 = 0;
ads->ds_ctl11 = 0;
}
}
static void ar9002_hw_set11n_ratescenario(struct ath_hw *ah, void *ds,
void *lastds,
u32 durUpdateEn, u32 rtsctsRate,
u32 rtsctsDuration,
struct ath9k_11n_rate_series series[],
u32 nseries, u32 flags)
{
struct ar5416_desc *ads = AR5416DESC(ds);
struct ar5416_desc *last_ads = AR5416DESC(lastds);
u32 ds_ctl0;
if (flags & (ATH9K_TXDESC_RTSENA | ATH9K_TXDESC_CTSENA)) {
ds_ctl0 = ads->ds_ctl0;
if (flags & ATH9K_TXDESC_RTSENA) {
ds_ctl0 &= ~AR_CTSEnable;
ds_ctl0 |= AR_RTSEnable;
} else {
ds_ctl0 &= ~AR_RTSEnable;
ds_ctl0 |= AR_CTSEnable;
}
ads->ds_ctl0 = ds_ctl0;
} else {
ads->ds_ctl0 =
(ads->ds_ctl0 & ~(AR_RTSEnable | AR_CTSEnable));
}
ads->ds_ctl2 = set11nTries(series, 0)
| set11nTries(series, 1)
| set11nTries(series, 2)
| set11nTries(series, 3)
| (durUpdateEn ? AR_DurUpdateEna : 0)
| SM(0, AR_BurstDur);
ads->ds_ctl3 = set11nRate(series, 0)
| set11nRate(series, 1)
| set11nRate(series, 2)
| set11nRate(series, 3);
ads->ds_ctl4 = set11nPktDurRTSCTS(series, 0)
| set11nPktDurRTSCTS(series, 1);
ads->ds_ctl5 = set11nPktDurRTSCTS(series, 2)
| set11nPktDurRTSCTS(series, 3);
ads->ds_ctl7 = set11nRateFlags(series, 0)
| set11nRateFlags(series, 1)
| set11nRateFlags(series, 2)
| set11nRateFlags(series, 3)
| SM(rtsctsRate, AR_RTSCTSRate);
last_ads->ds_ctl2 = ads->ds_ctl2;
last_ads->ds_ctl3 = ads->ds_ctl3;
}
static void ar9002_hw_set11n_aggr_first(struct ath_hw *ah, void *ds,
u32 aggrLen)
{
struct ar5416_desc *ads = AR5416DESC(ds);
ads->ds_ctl1 |= (AR_IsAggr | AR_MoreAggr);
ads->ds_ctl6 &= ~AR_AggrLen;
ads->ds_ctl6 |= SM(aggrLen, AR_AggrLen);
}
static void ar9002_hw_set11n_aggr_middle(struct ath_hw *ah, void *ds,
u32 numDelims)
{
struct ar5416_desc *ads = AR5416DESC(ds);
unsigned int ctl6;
ads->ds_ctl1 |= (AR_IsAggr | AR_MoreAggr);
ctl6 = ads->ds_ctl6;
ctl6 &= ~AR_PadDelim;
ctl6 |= SM(numDelims, AR_PadDelim);
ads->ds_ctl6 = ctl6;
}
static void ar9002_hw_set11n_aggr_last(struct ath_hw *ah, void *ds)
{
struct ar5416_desc *ads = AR5416DESC(ds);
ads->ds_ctl1 |= AR_IsAggr;
ads->ds_ctl1 &= ~AR_MoreAggr;
ads->ds_ctl6 &= ~AR_PadDelim;
}
static void ar9002_hw_clr11n_aggr(struct ath_hw *ah, void *ds)
{
struct ar5416_desc *ads = AR5416DESC(ds);
ads->ds_ctl1 &= (~AR_IsAggr & ~AR_MoreAggr);
}
static void ar9002_hw_set11n_burstduration(struct ath_hw *ah, void *ds,
u32 burstDuration)
{
struct ar5416_desc *ads = AR5416DESC(ds);
ads->ds_ctl2 &= ~AR_BurstDur;
ads->ds_ctl2 |= SM(burstDuration, AR_BurstDur);
}
static void ar9002_hw_set11n_virtualmorefrag(struct ath_hw *ah, void *ds,
u32 vmf)
{
struct ar5416_desc *ads = AR5416DESC(ds);
if (vmf)
ads->ds_ctl0 |= AR_VirtMoreFrag;
else
ads->ds_ctl0 &= ~AR_VirtMoreFrag;
}
void ath9k_hw_setuprxdesc(struct ath_hw *ah, struct ath_desc *ds,
u32 size, u32 flags)
{
struct ar5416_desc *ads = AR5416DESC(ds);
struct ath9k_hw_capabilities *pCap = &ah->caps;
ads->ds_ctl1 = size & AR_BufLen;
if (flags & ATH9K_RXDESC_INTREQ)
ads->ds_ctl1 |= AR_RxIntrReq;
ads->ds_rxstatus8 &= ~AR_RxDone;
if (!(pCap->hw_caps & ATH9K_HW_CAP_AUTOSLEEP))
memset(&(ads->u), 0, sizeof(ads->u));
}
EXPORT_SYMBOL(ath9k_hw_setuprxdesc);
void ar9002_hw_attach_mac_ops(struct ath_hw *ah)
{
struct ath_hw_ops *ops = ath9k_hw_ops(ah);
ops->rx_enable = ar9002_hw_rx_enable;
ops->set_desc_link = ar9002_hw_set_desc_link;
ops->get_desc_link = ar9002_hw_get_desc_link;
ops->get_isr = ar9002_hw_get_isr;
ops->fill_txdesc = ar9002_hw_fill_txdesc;
ops->proc_txdesc = ar9002_hw_proc_txdesc;
ops->set11n_txdesc = ar9002_hw_set11n_txdesc;
ops->set11n_ratescenario = ar9002_hw_set11n_ratescenario;
ops->set11n_aggr_first = ar9002_hw_set11n_aggr_first;
ops->set11n_aggr_middle = ar9002_hw_set11n_aggr_middle;
ops->set11n_aggr_last = ar9002_hw_set11n_aggr_last;
ops->clr11n_aggr = ar9002_hw_clr11n_aggr;
ops->set11n_burstduration = ar9002_hw_set11n_burstduration;
ops->set11n_virtualmorefrag = ar9002_hw_set11n_virtualmorefrag;
}
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