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ath9k: fix processing of TX PS null data frames

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When mac80211 was telling us to go into Powersave we listened
and immediately turned RX off. This meant hardware would not
see the ACKs from the AP we're associated with and hardware
we'd end up retransmiting the null data frame in a loop
helplessly.

Fix this by keeping track of the transmitted nullfunc frames
and only when we are sure the AP has sent back an ACK do we
go ahead and shut RX off.

Signed-off-by: Vasanthakumar Thiagarajan <vasanth@atheros.com>
Signed-off-by: Vivek Natarajan <Vivek.Natarajan@atheros.com>
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Luis R. Rodriguez 2009-11-24 02:53:25 -05:00 committed by John W. Linville
parent 6b65b6ad01
commit e7824a5066
7 changed files with 69 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/wireless/ath/ath9k/ath9k.h
View File

@ -420,6 +420,8 @@ struct ath_led {
#define SC_OP_WAIT_FOR_TX_ACK BIT(18)
#define SC_OP_BEACON_SYNC BIT(19)
#define SC_OP_BT_PRIORITY_DETECTED BIT(21)
#define SC_OP_NULLFUNC_COMPLETED BIT(22)
#define SC_OP_PS_ENABLED BIT(23)
struct ath_wiphy;
struct ath_rate_table;

1
drivers/net/wireless/ath/ath9k/common.h
View File

@ -78,6 +78,7 @@ struct ath_buf {
dma_addr_t bf_daddr; /* physical addr of desc */
dma_addr_t bf_buf_addr; /* physical addr of data buffer */
bool bf_stale;
bool bf_isnullfunc;
u16 bf_flags;
struct ath_buf_state bf_state;
dma_addr_t bf_dmacontext;

9
drivers/net/wireless/ath/ath9k/mac.c
View File

@ -231,6 +231,8 @@ int ath9k_hw_txprocdesc(struct ath_hw *ah, struct ath_desc *ds)
ds->ds_txstat.ts_status = 0;
ds->ds_txstat.ts_flags = 0;
if (ads->ds_txstatus1 & AR_FrmXmitOK)
ds->ds_txstat.ts_status |= ATH9K_TX_ACKED;
if (ads->ds_txstatus1 & AR_ExcessiveRetries)
ds->ds_txstat.ts_status |= ATH9K_TXERR_XRETRY;
if (ads->ds_txstatus1 & AR_Filtered)
@ -926,6 +928,13 @@ void ath9k_hw_setuprxdesc(struct ath_hw *ah, struct ath_desc *ds,
}
EXPORT_SYMBOL(ath9k_hw_setuprxdesc);
/*
* This can stop or re-enables RX.
*
* If bool is set this will kill any frame which is currently being
* transferred between the MAC and baseband and also prevent any new
* frames from getting started.
*/
bool ath9k_hw_setrxabort(struct ath_hw *ah, bool set)
{
u32 reg;

6
drivers/net/wireless/ath/ath9k/mac.h
View File

@ -76,6 +76,7 @@
#define ATH9K_TXERR_FIFO 0x04
#define ATH9K_TXERR_XTXOP 0x08
#define ATH9K_TXERR_TIMER_EXPIRED 0x10
#define ATH9K_TX_ACKED 0x20
#define ATH9K_TX_BA 0x01
#define ATH9K_TX_PWRMGMT 0x02
@ -380,6 +381,11 @@ struct ar5416_desc {
#define AR_TxBaStatus 0x40000000
#define AR_TxStatusRsvd01 0x80000000
/*
* AR_FrmXmitOK - Frame transmission success flag. If set, the frame was
* transmitted successfully. If clear, no ACK or BA was received to indicate
* successful transmission when we were expecting an ACK or BA.
*/
#define AR_FrmXmitOK 0x00000001
#define AR_ExcessiveRetries 0x00000002
#define AR_FIFOUnderrun 0x00000004

20
drivers/net/wireless/ath/ath9k/main.c
View File

@ -2701,8 +2701,15 @@ static int ath9k_config(struct ieee80211_hw *hw, u32 changed)
}
}
/*
* We just prepare to enable PS. We have to wait until our AP has
* ACK'd our null data frame to disable RX otherwise we'll ignore
* those ACKs and end up retransmitting the same null data frames.
* IEEE80211_CONF_CHANGE_PS is only passed by mac80211 for STA mode.
*/
if (changed & IEEE80211_CONF_CHANGE_PS) {
if (conf->flags & IEEE80211_CONF_PS) {
sc->sc_flags |= SC_OP_PS_ENABLED;
if (!(ah->caps.hw_caps &
ATH9K_HW_CAP_AUTOSLEEP)) {
if ((sc->imask & ATH9K_INT_TIM_TIMER) == 0) {
@ -2710,11 +2717,20 @@ static int ath9k_config(struct ieee80211_hw *hw, u32 changed)
ath9k_hw_set_interrupts(sc->sc_ah,
sc->imask);
}
ath9k_hw_setrxabort(sc->sc_ah, 1);
}
sc->ps_enabled = true;
/*
* At this point we know hardware has received an ACK
* of a previously sent null data frame.
*/
if ((sc->sc_flags & SC_OP_NULLFUNC_COMPLETED)) {
sc->sc_flags &= ~SC_OP_NULLFUNC_COMPLETED;
sc->ps_enabled = true;
ath9k_hw_setrxabort(sc->sc_ah, 1);
}
} else {
sc->ps_enabled = false;
sc->sc_flags &= ~(SC_OP_PS_ENABLED |
SC_OP_NULLFUNC_COMPLETED);
ath9k_setpower(sc, ATH9K_PM_AWAKE);
if (!(ah->caps.hw_caps &
ATH9K_HW_CAP_AUTOSLEEP)) {

15
drivers/net/wireless/ath/ath9k/reg.h
View File

@ -1332,13 +1332,22 @@ enum {
#define AR_MCAST_FIL0 0x8040
#define AR_MCAST_FIL1 0x8044
/*
* AR_DIAG_SW - Register which can be used for diagnostics and testing purposes.
*
* The force RX abort (AR_DIAG_RX_ABORT, bit 25) can be used in conjunction with
* RX block (AR_DIAG_RX_DIS, bit 5) to help fast channel change to shut down
* receive. The force RX abort bit will kill any frame which is currently being
* transferred between the MAC and baseband. The RX block bit (AR_DIAG_RX_DIS)
* will prevent any new frames from getting started.
*/
#define AR_DIAG_SW 0x8048
#define AR_DIAG_CACHE_ACK 0x00000001
#define AR_DIAG_ACK_DIS 0x00000002
#define AR_DIAG_CTS_DIS 0x00000004
#define AR_DIAG_ENCRYPT_DIS 0x00000008
#define AR_DIAG_DECRYPT_DIS 0x00000010
#define AR_DIAG_RX_DIS 0x00000020
#define AR_DIAG_RX_DIS 0x00000020 /* RX block */
#define AR_DIAG_LOOP_BACK 0x00000040
#define AR_DIAG_CORR_FCS 0x00000080
#define AR_DIAG_CHAN_INFO 0x00000100
@ -1347,12 +1356,12 @@ enum {
#define AR_DIAG_FRAME_NV0 0x00020000
#define AR_DIAG_OBS_PT_SEL1 0x000C0000
#define AR_DIAG_OBS_PT_SEL1_S 18
#define AR_DIAG_FORCE_RX_CLEAR 0x00100000
#define AR_DIAG_FORCE_RX_CLEAR 0x00100000 /* force rx_clear high */
#define AR_DIAG_IGNORE_VIRT_CS 0x00200000
#define AR_DIAG_FORCE_CH_IDLE_HIGH 0x00400000
#define AR_DIAG_EIFS_CTRL_ENA 0x00800000
#define AR_DIAG_DUAL_CHAIN_INFO 0x01000000
#define AR_DIAG_RX_ABORT 0x02000000
#define AR_DIAG_RX_ABORT 0x02000000 /* Force RX abort */
#define AR_DIAG_SATURATE_CYCLE_CNT 0x04000000
#define AR_DIAG_OBS_PT_SEL2 0x08000000
#define AR_DIAG_RX_CLEAR_CTL_LOW 0x10000000

21
drivers/net/wireless/ath/ath9k/xmit.c
View File

@ -1644,6 +1644,14 @@ static int ath_tx_setup_buffer(struct ieee80211_hw *hw, struct ath_buf *bf,
}
bf->bf_buf_addr = bf->bf_dmacontext;
/* tag if this is a nullfunc frame to enable PS when AP acks it */
if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc)) {
bf->bf_isnullfunc = true;
sc->sc_flags &= ~SC_OP_NULLFUNC_COMPLETED;
} else
bf->bf_isnullfunc = false;
return 0;
}
@ -2038,6 +2046,19 @@ static void ath_tx_processq(struct ath_softc *sc, struct ath_txq *txq)
break;
}
/*
* We now know the nullfunc frame has been ACKed so we
* can disable RX.
*/
if (bf->bf_isnullfunc &&
(ds->ds_txstat.ts_status & ATH9K_TX_ACKED)) {
if ((sc->sc_flags & SC_OP_PS_ENABLED)) {
sc->ps_enabled = true;
ath9k_hw_setrxabort(sc->sc_ah, 1);
} else
sc->sc_flags |= SC_OP_NULLFUNC_COMPLETED;
}
/*
* Remove ath_buf's of the same transmit unit from txq,
* however leave the last descriptor back as the holding