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ath5k: add some more performance improvements 

SVN-Revision: 26566
owl
Felix Fietkau 2011-04-09 22:56:51 +00:00
parent 3df1de1b80
commit 8ee695885a
5 changed files with 444 additions and 0 deletions
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89
package/mac80211/patches/464-ath5k_optimize_tx_desc_setup.patch Normal file
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@ -0,0 +1,89 @@
--- a/drivers/net/wireless/ath/ath5k/desc.c
+++ b/drivers/net/wireless/ath/ath5k/desc.c
@@ -184,6 +184,7 @@ static int ath5k_hw_setup_4word_tx_desc(
{
struct ath5k_hw_4w_tx_ctl *tx_ctl;
unsigned int frame_len;
+ u32 txctl0 = 0, txctl1 = 0, txctl2 = 0, txctl3 = 0;
tx_ctl = &desc->ud.ds_tx5212.tx_ctl;
@@ -209,7 +210,8 @@ static int ath5k_hw_setup_4word_tx_desc(
tx_power = AR5K_TUNE_MAX_TXPOWER;
/* Clear descriptor */
- memset(&desc->ud.ds_tx5212, 0, sizeof(struct ath5k_hw_5212_tx_desc));
+ memset(&desc->ud.ds_tx5212.tx_stat, 0,
+ sizeof(desc->ud.ds_tx5212.tx_stat));
/* Setup control descriptor */
@@ -221,7 +223,7 @@ static int ath5k_hw_setup_4word_tx_desc(
if (frame_len & ~AR5K_4W_TX_DESC_CTL0_FRAME_LEN)
return -EINVAL;
- tx_ctl->tx_control_0 = frame_len & AR5K_4W_TX_DESC_CTL0_FRAME_LEN;
+ txctl0 = frame_len & AR5K_4W_TX_DESC_CTL0_FRAME_LEN;
/* Verify and set buffer length */
@@ -232,21 +234,17 @@ static int ath5k_hw_setup_4word_tx_desc(
if (pkt_len & ~AR5K_4W_TX_DESC_CTL1_BUF_LEN)
return -EINVAL;
- tx_ctl->tx_control_1 = pkt_len & AR5K_4W_TX_DESC_CTL1_BUF_LEN;
+ txctl1 = pkt_len & AR5K_4W_TX_DESC_CTL1_BUF_LEN;
- tx_ctl->tx_control_0 |=
- AR5K_REG_SM(tx_power, AR5K_4W_TX_DESC_CTL0_XMIT_POWER) |
- AR5K_REG_SM(antenna_mode, AR5K_4W_TX_DESC_CTL0_ANT_MODE_XMIT);
- tx_ctl->tx_control_1 |= AR5K_REG_SM(type,
- AR5K_4W_TX_DESC_CTL1_FRAME_TYPE);
- tx_ctl->tx_control_2 = AR5K_REG_SM(tx_tries0,
- AR5K_4W_TX_DESC_CTL2_XMIT_TRIES0);
- tx_ctl->tx_control_3 = tx_rate0 & AR5K_4W_TX_DESC_CTL3_XMIT_RATE0;
+ txctl0 |= AR5K_REG_SM(tx_power, AR5K_4W_TX_DESC_CTL0_XMIT_POWER) |
+ AR5K_REG_SM(antenna_mode, AR5K_4W_TX_DESC_CTL0_ANT_MODE_XMIT);
+ txctl1 |= AR5K_REG_SM(type, AR5K_4W_TX_DESC_CTL1_FRAME_TYPE);
+ txctl2 = AR5K_REG_SM(tx_tries0, AR5K_4W_TX_DESC_CTL2_XMIT_TRIES0);
+ txctl3 = tx_rate0 & AR5K_4W_TX_DESC_CTL3_XMIT_RATE0;
#define _TX_FLAGS(_c, _flag) \
if (flags & AR5K_TXDESC_##_flag) { \
- tx_ctl->tx_control_##_c |= \
- AR5K_4W_TX_DESC_CTL##_c##_##_flag; \
+ txctl##_c |= AR5K_4W_TX_DESC_CTL##_c##_##_flag; \
}
_TX_FLAGS(0, CLRDMASK);
@@ -262,8 +260,8 @@ static int ath5k_hw_setup_4word_tx_desc(
* WEP crap
*/
if (key_index != AR5K_TXKEYIX_INVALID) {
- tx_ctl->tx_control_0 |= AR5K_4W_TX_DESC_CTL0_ENCRYPT_KEY_VALID;
- tx_ctl->tx_control_1 |= AR5K_REG_SM(key_index,
+ txctl0 |= AR5K_4W_TX_DESC_CTL0_ENCRYPT_KEY_VALID;
+ txctl1 |= AR5K_REG_SM(key_index,
AR5K_4W_TX_DESC_CTL1_ENCRYPT_KEY_IDX);
}
@@ -274,12 +272,16 @@ static int ath5k_hw_setup_4word_tx_desc(
if ((flags & AR5K_TXDESC_RTSENA) &&
(flags & AR5K_TXDESC_CTSENA))
return -EINVAL;
- tx_ctl->tx_control_2 |= rtscts_duration &
- AR5K_4W_TX_DESC_CTL2_RTS_DURATION;
- tx_ctl->tx_control_3 |= AR5K_REG_SM(rtscts_rate,
+ txctl2 |= rtscts_duration & AR5K_4W_TX_DESC_CTL2_RTS_DURATION;
+ txctl3 |= AR5K_REG_SM(rtscts_rate,
AR5K_4W_TX_DESC_CTL3_RTS_CTS_RATE);
}
+ tx_ctl->tx_control_0 = txctl0;
+ tx_ctl->tx_control_1 = txctl1;
+ tx_ctl->tx_control_2 = txctl2;
+ tx_ctl->tx_control_3 = txctl3;
+
return 0;
}

54
package/mac80211/patches/465-ath5k_remove_ts_rate.patch Normal file
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@ -0,0 +1,54 @@
--- a/drivers/net/wireless/ath/ath5k/ath5k.h
+++ b/drivers/net/wireless/ath/ath5k/ath5k.h
@@ -452,7 +452,6 @@ struct ath5k_tx_status {
u16 ts_seqnum;
u16 ts_tstamp;
u8 ts_status;
- u8 ts_rate[4];
u8 ts_retry[4];
u8 ts_final_idx;
s8 ts_rssi;
--- a/drivers/net/wireless/ath/ath5k/desc.c
+++ b/drivers/net/wireless/ath/ath5k/desc.c
@@ -375,8 +375,6 @@ static int ath5k_hw_proc_2word_tx_status
AR5K_DESC_TX_STATUS1_ACK_SIG_STRENGTH);
ts->ts_antenna = 1;
ts->ts_status = 0;
- ts->ts_rate[0] = AR5K_REG_MS(tx_ctl->tx_control_0,
- AR5K_2W_TX_DESC_CTL0_XMIT_RATE);
ts->ts_retry[0] = ts->ts_longretry;
ts->ts_final_idx = 0;
@@ -439,32 +437,21 @@ static int ath5k_hw_proc_4word_tx_status
ts->ts_retry[ts->ts_final_idx] = ts->ts_longretry;
switch (ts->ts_final_idx) {
case 3:
- ts->ts_rate[3] = AR5K_REG_MS(tx_ctl->tx_control_3,
- AR5K_4W_TX_DESC_CTL3_XMIT_RATE3);
-
ts->ts_retry[2] = AR5K_REG_MS(tx_ctl->tx_control_2,
AR5K_4W_TX_DESC_CTL2_XMIT_TRIES2);
ts->ts_longretry += ts->ts_retry[2];
/* fall through */
case 2:
- ts->ts_rate[2] = AR5K_REG_MS(tx_ctl->tx_control_3,
- AR5K_4W_TX_DESC_CTL3_XMIT_RATE2);
-
ts->ts_retry[1] = AR5K_REG_MS(tx_ctl->tx_control_2,
AR5K_4W_TX_DESC_CTL2_XMIT_TRIES1);
ts->ts_longretry += ts->ts_retry[1];
/* fall through */
case 1:
- ts->ts_rate[1] = AR5K_REG_MS(tx_ctl->tx_control_3,
- AR5K_4W_TX_DESC_CTL3_XMIT_RATE1);
-
ts->ts_retry[0] = AR5K_REG_MS(tx_ctl->tx_control_2,
AR5K_4W_TX_DESC_CTL2_XMIT_TRIES1);
ts->ts_longretry += ts->ts_retry[0];
/* fall through */
case 0:
- ts->ts_rate[0] = tx_ctl->tx_control_3 &
- AR5K_4W_TX_DESC_CTL3_XMIT_RATE0;
break;
}

90
package/mac80211/patches/466-ath5k_optimize_tx_status.patch Normal file
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@ -0,0 +1,90 @@
--- a/drivers/net/wireless/ath/ath5k/desc.c
+++ b/drivers/net/wireless/ath/ath5k/desc.c
@@ -401,32 +401,38 @@ static int ath5k_hw_proc_4word_tx_status
{
struct ath5k_hw_4w_tx_ctl *tx_ctl;
struct ath5k_hw_tx_status *tx_status;
+ u32 txstat0, txstat1, txctl2;
tx_ctl = &desc->ud.ds_tx5212.tx_ctl;
tx_status = &desc->ud.ds_tx5212.tx_stat;
+ txstat1 = ACCESS_ONCE(tx_status->tx_status_1);
+
/* No frame has been send or error */
- if (unlikely(!(tx_status->tx_status_1 & AR5K_DESC_TX_STATUS1_DONE)))
+ if (unlikely(!(txstat1 & AR5K_DESC_TX_STATUS1_DONE)))
return -EINPROGRESS;
+ txstat0 = ACCESS_ONCE(tx_status->tx_status_0);
+ txctl2 = ACCESS_ONCE(tx_ctl->tx_control_2);
+
/*
* Get descriptor status
*/
- ts->ts_tstamp = AR5K_REG_MS(tx_status->tx_status_0,
+ ts->ts_tstamp = AR5K_REG_MS(txstat0,
AR5K_DESC_TX_STATUS0_SEND_TIMESTAMP);
- ts->ts_shortretry = AR5K_REG_MS(tx_status->tx_status_0,
+ ts->ts_shortretry = AR5K_REG_MS(txstat0,
AR5K_DESC_TX_STATUS0_SHORT_RETRY_COUNT);
- ts->ts_longretry = AR5K_REG_MS(tx_status->tx_status_0,
+ ts->ts_longretry = AR5K_REG_MS(txstat0,
AR5K_DESC_TX_STATUS0_LONG_RETRY_COUNT);
- ts->ts_seqnum = AR5K_REG_MS(tx_status->tx_status_1,
+ ts->ts_seqnum = AR5K_REG_MS(txstat1,
AR5K_DESC_TX_STATUS1_SEQ_NUM);
- ts->ts_rssi = AR5K_REG_MS(tx_status->tx_status_1,
+ ts->ts_rssi = AR5K_REG_MS(txstat1,
AR5K_DESC_TX_STATUS1_ACK_SIG_STRENGTH);
- ts->ts_antenna = (tx_status->tx_status_1 &
+ ts->ts_antenna = (txstat1 &
AR5K_DESC_TX_STATUS1_XMIT_ANTENNA_5212) ? 2 : 1;
ts->ts_status = 0;
- ts->ts_final_idx = AR5K_REG_MS(tx_status->tx_status_1,
+ ts->ts_final_idx = AR5K_REG_MS(txstat1,
AR5K_DESC_TX_STATUS1_FINAL_TS_IX_5212);
/* The longretry counter has the number of un-acked retries
@@ -437,17 +443,17 @@ static int ath5k_hw_proc_4word_tx_status
ts->ts_retry[ts->ts_final_idx] = ts->ts_longretry;
switch (ts->ts_final_idx) {
case 3:
- ts->ts_retry[2] = AR5K_REG_MS(tx_ctl->tx_control_2,
+ ts->ts_retry[2] = AR5K_REG_MS(txctl2,
AR5K_4W_TX_DESC_CTL2_XMIT_TRIES2);
ts->ts_longretry += ts->ts_retry[2];
/* fall through */
case 2:
- ts->ts_retry[1] = AR5K_REG_MS(tx_ctl->tx_control_2,
+ ts->ts_retry[1] = AR5K_REG_MS(txctl2,
AR5K_4W_TX_DESC_CTL2_XMIT_TRIES1);
ts->ts_longretry += ts->ts_retry[1];
/* fall through */
case 1:
- ts->ts_retry[0] = AR5K_REG_MS(tx_ctl->tx_control_2,
+ ts->ts_retry[0] = AR5K_REG_MS(txctl2,
AR5K_4W_TX_DESC_CTL2_XMIT_TRIES1);
ts->ts_longretry += ts->ts_retry[0];
/* fall through */
@@ -456,15 +462,14 @@ static int ath5k_hw_proc_4word_tx_status
}
/* TX error */
- if (!(tx_status->tx_status_0 & AR5K_DESC_TX_STATUS0_FRAME_XMIT_OK)) {
- if (tx_status->tx_status_0 &
- AR5K_DESC_TX_STATUS0_EXCESSIVE_RETRIES)
+ if (!(txstat0 & AR5K_DESC_TX_STATUS0_FRAME_XMIT_OK)) {
+ if (txstat0 & AR5K_DESC_TX_STATUS0_EXCESSIVE_RETRIES)
ts->ts_status |= AR5K_TXERR_XRETRY;
- if (tx_status->tx_status_0 & AR5K_DESC_TX_STATUS0_FIFO_UNDERRUN)
+ if (txstat0 & AR5K_DESC_TX_STATUS0_FIFO_UNDERRUN)
ts->ts_status |= AR5K_TXERR_FIFO;
- if (tx_status->tx_status_0 & AR5K_DESC_TX_STATUS0_FILTERED)
+ if (txstat0 & AR5K_DESC_TX_STATUS0_FILTERED)
ts->ts_status |= AR5K_TXERR_FILT;
}

86
package/mac80211/patches/467-ath5k_optimize_rx_status.patch Normal file
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@ -0,0 +1,86 @@
--- a/drivers/net/wireless/ath/ath5k/desc.c
+++ b/drivers/net/wireless/ath/ath5k/desc.c
@@ -603,37 +603,37 @@ static int ath5k_hw_proc_5212_rx_status(
struct ath5k_rx_status *rs)
{
struct ath5k_hw_rx_status *rx_status;
+ u32 rxstat0, rxstat1;
rx_status = &desc->ud.ds_rx.rx_stat;
+ rxstat1 = ACCESS_ONCE(rx_status->rx_status_1);
/* No frame received / not ready */
- if (unlikely(!(rx_status->rx_status_1 &
- AR5K_5212_RX_DESC_STATUS1_DONE)))
+ if (unlikely(!(rxstat1 & AR5K_5212_RX_DESC_STATUS1_DONE)))
return -EINPROGRESS;
memset(rs, 0, sizeof(struct ath5k_rx_status));
+ rxstat0 = ACCESS_ONCE(rx_status->rx_status_0);
/*
* Frame receive status
*/
- rs->rs_datalen = rx_status->rx_status_0 &
- AR5K_5212_RX_DESC_STATUS0_DATA_LEN;
- rs->rs_rssi = AR5K_REG_MS(rx_status->rx_status_0,
+ rs->rs_datalen = rxstat0 & AR5K_5212_RX_DESC_STATUS0_DATA_LEN;
+ rs->rs_rssi = AR5K_REG_MS(rxstat0,
AR5K_5212_RX_DESC_STATUS0_RECEIVE_SIGNAL);
- rs->rs_rate = AR5K_REG_MS(rx_status->rx_status_0,
+ rs->rs_rate = AR5K_REG_MS(rxstat0,
AR5K_5212_RX_DESC_STATUS0_RECEIVE_RATE);
- rs->rs_antenna = AR5K_REG_MS(rx_status->rx_status_0,
+ rs->rs_antenna = AR5K_REG_MS(rxstat0,
AR5K_5212_RX_DESC_STATUS0_RECEIVE_ANTENNA);
- rs->rs_more = !!(rx_status->rx_status_0 &
- AR5K_5212_RX_DESC_STATUS0_MORE);
- rs->rs_tstamp = AR5K_REG_MS(rx_status->rx_status_1,
+ rs->rs_more = !!(rxstat0 & AR5K_5212_RX_DESC_STATUS0_MORE);
+ rs->rs_tstamp = AR5K_REG_MS(rxstat1,
AR5K_5212_RX_DESC_STATUS1_RECEIVE_TIMESTAMP);
/*
* Key table status
*/
- if (rx_status->rx_status_1 & AR5K_5212_RX_DESC_STATUS1_KEY_INDEX_VALID)
- rs->rs_keyix = AR5K_REG_MS(rx_status->rx_status_1,
+ if (rxstat1 & AR5K_5212_RX_DESC_STATUS1_KEY_INDEX_VALID)
+ rs->rs_keyix = AR5K_REG_MS(rxstat1,
AR5K_5212_RX_DESC_STATUS1_KEY_INDEX);
else
rs->rs_keyix = AR5K_RXKEYIX_INVALID;
@@ -641,27 +641,22 @@ static int ath5k_hw_proc_5212_rx_status(
/*
* Receive/descriptor errors
*/
- if (!(rx_status->rx_status_1 &
- AR5K_5212_RX_DESC_STATUS1_FRAME_RECEIVE_OK)) {
- if (rx_status->rx_status_1 &
- AR5K_5212_RX_DESC_STATUS1_CRC_ERROR)
+ if (!(rxstat1 & AR5K_5212_RX_DESC_STATUS1_FRAME_RECEIVE_OK)) {
+ if (rxstat1 & AR5K_5212_RX_DESC_STATUS1_CRC_ERROR)
rs->rs_status |= AR5K_RXERR_CRC;
- if (rx_status->rx_status_1 &
- AR5K_5212_RX_DESC_STATUS1_PHY_ERROR) {
+ if (rxstat1 & AR5K_5212_RX_DESC_STATUS1_PHY_ERROR) {
rs->rs_status |= AR5K_RXERR_PHY;
- rs->rs_phyerr = AR5K_REG_MS(rx_status->rx_status_1,
+ rs->rs_phyerr = AR5K_REG_MS(rxstat1,
AR5K_5212_RX_DESC_STATUS1_PHY_ERROR_CODE);
if (!ah->ah_capabilities.cap_has_phyerr_counters)
ath5k_ani_phy_error_report(ah, rs->rs_phyerr);
}
- if (rx_status->rx_status_1 &
- AR5K_5212_RX_DESC_STATUS1_DECRYPT_CRC_ERROR)
+ if (rxstat1 & AR5K_5212_RX_DESC_STATUS1_DECRYPT_CRC_ERROR)
rs->rs_status |= AR5K_RXERR_DECRYPT;
- if (rx_status->rx_status_1 &
- AR5K_5212_RX_DESC_STATUS1_MIC_ERROR)
+ if (rxstat1 & AR5K_5212_RX_DESC_STATUS1_MIC_ERROR)
rs->rs_status |= AR5K_RXERR_MIC;
}
return 0;

125
package/mac80211/patches/468-ath5k_remove_ts_retry.patch Normal file
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@ -0,0 +1,125 @@
--- a/drivers/net/wireless/ath/ath5k/ath5k.h
+++ b/drivers/net/wireless/ath/ath5k/ath5k.h
@@ -452,11 +452,10 @@ struct ath5k_tx_status {
u16 ts_seqnum;
u16 ts_tstamp;
u8 ts_status;
- u8 ts_retry[4];
u8 ts_final_idx;
+ u8 ts_final_retry;
s8 ts_rssi;
u8 ts_shortretry;
- u8 ts_longretry;
u8 ts_virtcol;
u8 ts_antenna;
};
--- a/drivers/net/wireless/ath/ath5k/base.c
+++ b/drivers/net/wireless/ath/ath5k/base.c
@@ -1573,20 +1573,27 @@ ath5k_tx_frame_completed(struct ath5k_so
struct ath5k_txq *txq, struct ath5k_tx_status *ts)
{
struct ieee80211_tx_info *info;
+ u8 tries[3];
int i;
sc->stats.tx_all_count++;
sc->stats.tx_bytes_count += skb->len;
info = IEEE80211_SKB_CB(skb);
+ tries[0] = info->status.rates[0].count;
+ tries[1] = info->status.rates[1].count;
+ tries[2] = info->status.rates[2].count;
+
ieee80211_tx_info_clear_status(info);
- for (i = 0; i <= ts->ts_final_idx; i++) {
+
+ for (i = 0; i < ts->ts_final_idx; i++) {
struct ieee80211_tx_rate *r =
&info->status.rates[i];
- r->count = ts->ts_retry[i];
+ r->count = tries[i];
}
+ info->status.rates[ts->ts_final_idx].count = ts->ts_final_retry;
info->status.rates[ts->ts_final_idx + 1].idx = -1;
if (unlikely(ts->ts_status)) {
--- a/drivers/net/wireless/ath/ath5k/desc.c
+++ b/drivers/net/wireless/ath/ath5k/desc.c
@@ -366,7 +366,7 @@ static int ath5k_hw_proc_2word_tx_status
AR5K_DESC_TX_STATUS0_SEND_TIMESTAMP);
ts->ts_shortretry = AR5K_REG_MS(tx_status->tx_status_0,
AR5K_DESC_TX_STATUS0_SHORT_RETRY_COUNT);
- ts->ts_longretry = AR5K_REG_MS(tx_status->tx_status_0,
+ ts->ts_final_retry = AR5K_REG_MS(tx_status->tx_status_0,
AR5K_DESC_TX_STATUS0_LONG_RETRY_COUNT);
/*TODO: ts->ts_virtcol + test*/
ts->ts_seqnum = AR5K_REG_MS(tx_status->tx_status_1,
@@ -375,7 +375,6 @@ static int ath5k_hw_proc_2word_tx_status
AR5K_DESC_TX_STATUS1_ACK_SIG_STRENGTH);
ts->ts_antenna = 1;
ts->ts_status = 0;
- ts->ts_retry[0] = ts->ts_longretry;
ts->ts_final_idx = 0;
if (!(tx_status->tx_status_0 & AR5K_DESC_TX_STATUS0_FRAME_XMIT_OK)) {
@@ -401,7 +400,7 @@ static int ath5k_hw_proc_4word_tx_status
{
struct ath5k_hw_4w_tx_ctl *tx_ctl;
struct ath5k_hw_tx_status *tx_status;
- u32 txstat0, txstat1, txctl2;
+ u32 txstat0, txstat1;
tx_ctl = &desc->ud.ds_tx5212.tx_ctl;
tx_status = &desc->ud.ds_tx5212.tx_stat;
@@ -413,7 +412,6 @@ static int ath5k_hw_proc_4word_tx_status
return -EINPROGRESS;
txstat0 = ACCESS_ONCE(tx_status->tx_status_0);
- txctl2 = ACCESS_ONCE(tx_ctl->tx_control_2);
/*
* Get descriptor status
@@ -422,7 +420,7 @@ static int ath5k_hw_proc_4word_tx_status
AR5K_DESC_TX_STATUS0_SEND_TIMESTAMP);
ts->ts_shortretry = AR5K_REG_MS(txstat0,
AR5K_DESC_TX_STATUS0_SHORT_RETRY_COUNT);
- ts->ts_longretry = AR5K_REG_MS(txstat0,
+ ts->ts_final_retry = AR5K_REG_MS(txstat0,
AR5K_DESC_TX_STATUS0_LONG_RETRY_COUNT);
ts->ts_seqnum = AR5K_REG_MS(txstat1,
AR5K_DESC_TX_STATUS1_SEQ_NUM);
@@ -435,32 +433,6 @@ static int ath5k_hw_proc_4word_tx_status
ts->ts_final_idx = AR5K_REG_MS(txstat1,
AR5K_DESC_TX_STATUS1_FINAL_TS_IX_5212);
- /* The longretry counter has the number of un-acked retries
- * for the final rate. To get the total number of retries
- * we have to add the retry counters for the other rates
- * as well
- */
- ts->ts_retry[ts->ts_final_idx] = ts->ts_longretry;
- switch (ts->ts_final_idx) {
- case 3:
- ts->ts_retry[2] = AR5K_REG_MS(txctl2,
- AR5K_4W_TX_DESC_CTL2_XMIT_TRIES2);
- ts->ts_longretry += ts->ts_retry[2];
- /* fall through */
- case 2:
- ts->ts_retry[1] = AR5K_REG_MS(txctl2,
- AR5K_4W_TX_DESC_CTL2_XMIT_TRIES1);
- ts->ts_longretry += ts->ts_retry[1];
- /* fall through */
- case 1:
- ts->ts_retry[0] = AR5K_REG_MS(txctl2,
- AR5K_4W_TX_DESC_CTL2_XMIT_TRIES1);
- ts->ts_longretry += ts->ts_retry[0];
- /* fall through */
- case 0:
- break;
- }
-
/* TX error */
if (!(txstat0 & AR5K_DESC_TX_STATUS0_FRAME_XMIT_OK)) {
if (txstat0 & AR5K_DESC_TX_STATUS0_EXCESSIVE_RETRIES)