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authorFelix Fietkau <nbd@openwrt.org>2010-06-12 08:33:54 +0400
committerJohn W. Linville <linville@tuxdriver.com>2010-06-14 23:39:31 +0400
commita6d2055b02dde1067075795274672720baadd3ca (patch)
treeec2014019e26fc19be90c81c13373cbe1f7afe09
parentebe297c35d5e7137a2d626b49b4c8c4c0ab4f242 (diff)
downloadlinux-a6d2055b02dde1067075795274672720baadd3ca.tar.xz
ath9k: fix extending the rx timestamp with the hardware TSF
AR5416 and all newer chipsets use a 32 bit rx timestamp, so there is no need to keep the 15 bit timestamp extending logic around. This patch removes ath9k_hw_extend_tsf (replaced by a call to ath9k_hw_gettsf64), and reduces the frequency of TSF reads, which can improve performance in some cases. This change also has the side effect of making rx timestamps more accurate. 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/hw.c15
-rw-r--r--drivers/net/wireless/ath/ath9k/hw.h1
-rw-r--r--drivers/net/wireless/ath/ath9k/recv.c17
3 files changed, 14 insertions, 19 deletions
diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c
index 874c4e9d9899..1fa3fe7d5ae4 100644
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -2616,21 +2616,6 @@ void ath9k_hw_set_tsfadjust(struct ath_hw *ah, u32 setting)
}
EXPORT_SYMBOL(ath9k_hw_set_tsfadjust);
-/*
- * Extend 15-bit time stamp from rx descriptor to
- * a full 64-bit TSF using the current h/w TSF.
-*/
-u64 ath9k_hw_extend_tsf(struct ath_hw *ah, u32 rstamp)
-{
- u64 tsf;
-
- tsf = ath9k_hw_gettsf64(ah);
- if ((tsf & 0x7fff) < rstamp)
- tsf -= 0x8000;
- return (tsf & ~0x7fff) | rstamp;
-}
-EXPORT_SYMBOL(ath9k_hw_extend_tsf);
-
void ath9k_hw_set11nmac2040(struct ath_hw *ah)
{
struct ieee80211_conf *conf = &ath9k_hw_common(ah)->hw->conf;
diff --git a/drivers/net/wireless/ath/ath9k/hw.h b/drivers/net/wireless/ath/ath9k/hw.h
index 009f0fafee5d..ba84ac7ac4e2 100644
--- a/drivers/net/wireless/ath/ath9k/hw.h
+++ b/drivers/net/wireless/ath/ath9k/hw.h
@@ -894,7 +894,6 @@ u64 ath9k_hw_gettsf64(struct ath_hw *ah);
void ath9k_hw_settsf64(struct ath_hw *ah, u64 tsf64);
void ath9k_hw_reset_tsf(struct ath_hw *ah);
void ath9k_hw_set_tsfadjust(struct ath_hw *ah, u32 setting);
-u64 ath9k_hw_extend_tsf(struct ath_hw *ah, u32 rstamp);
void ath9k_hw_init_global_settings(struct ath_hw *ah);
void ath9k_hw_set11nmac2040(struct ath_hw *ah);
void ath9k_hw_beaconinit(struct ath_hw *ah, u32 next_beacon, u32 beacon_period);
diff --git a/drivers/net/wireless/ath/ath9k/recv.c b/drivers/net/wireless/ath/ath9k/recv.c
index 5141cd81b5d0..78ef1aed060c 100644
--- a/drivers/net/wireless/ath/ath9k/recv.c
+++ b/drivers/net/wireless/ath/ath9k/recv.c
@@ -1002,8 +1002,6 @@ static int ath9k_rx_skb_preprocess(struct ath_common *common,
struct ieee80211_rx_status *rx_status,
bool *decrypt_error)
{
- struct ath_hw *ah = common->ah;
-
memset(rx_status, 0, sizeof(struct ieee80211_rx_status));
/*
@@ -1018,7 +1016,6 @@ static int ath9k_rx_skb_preprocess(struct ath_common *common,
if (ath9k_process_rate(common, hw, rx_stats, rx_status))
return -EINVAL;
- rx_status->mactime = ath9k_hw_extend_tsf(ah, rx_stats->rs_tstamp);
rx_status->band = hw->conf.channel->band;
rx_status->freq = hw->conf.channel->center_freq;
rx_status->signal = ATH_DEFAULT_NOISE_FLOOR + rx_stats->rs_rssi;
@@ -1100,6 +1097,8 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp)
bool edma = !!(ah->caps.hw_caps & ATH9K_HW_CAP_EDMA);
int dma_type;
u8 rx_status_len = ah->caps.rx_status_len;
+ u64 tsf = 0;
+ u32 tsf_lower = 0;
if (edma)
dma_type = DMA_BIDIRECTIONAL;
@@ -1109,6 +1108,9 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp)
qtype = hp ? ATH9K_RX_QUEUE_HP : ATH9K_RX_QUEUE_LP;
spin_lock_bh(&sc->rx.rxbuflock);
+ tsf = ath9k_hw_gettsf64(ah);
+ tsf_lower = tsf & 0xffffffff;
+
do {
/* If handling rx interrupt and flush is in progress => exit */
if ((sc->sc_flags & SC_OP_RXFLUSH) && (flush == 0))
@@ -1141,6 +1143,15 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp)
if (flush)
goto requeue;
+ rxs->mactime = (tsf & ~0xffffffffULL) | rs.rs_tstamp;
+ if (rs.rs_tstamp > tsf_lower &&
+ unlikely(rs.rs_tstamp - tsf_lower > 0x10000000))
+ rxs->mactime -= 0x100000000ULL;
+
+ if (rs.rs_tstamp < tsf_lower &&
+ unlikely(tsf_lower - rs.rs_tstamp > 0x10000000))
+ rxs->mactime += 0x100000000ULL;
+
retval = ath9k_rx_skb_preprocess(common, hw, hdr, &rs,
rxs, &decrypt_error);
if (retval)