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authorVladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>2014-01-08 11:50:47 +0200
committerJohn W. Linville <linville@tuxdriver.com>2014-01-09 10:56:38 -0500
commit83982cbe2bf095d258dcb1687b70622cab18347d (patch)
tree8ad3c6fc13705d38e4c2c3516d2d42c345537d43
parent11e69c36eefd625db543a109789358be14d4cd5c (diff)
downloadlinux-83982cbe2bf095d258dcb1687b70622cab18347d.tar.bz2
wil6210: interrupt moderation
Use hardware capabilities to limit IRQ generation to about 15 per msec It corresponds to about 7 packets/IRQ when running iperf with default parameters at 1.3Gbps Do not enable this feature in the sniffer (monitor) mode, because interrupt moderation cause timestamp accuracy deterioration. For the sniffer flow, it is important to get precise timestamp. Signed-off-by: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
-rw-r--r--drivers/net/wireless/ath/wil6210/interrupt.c13
-rw-r--r--drivers/net/wireless/ath/wil6210/wil6210.h1
2 files changed, 14 insertions, 0 deletions
diff --git a/drivers/net/wireless/ath/wil6210/interrupt.c b/drivers/net/wireless/ath/wil6210/interrupt.c
index 8205d3e4ab66..10919f95a83c 100644
--- a/drivers/net/wireless/ath/wil6210/interrupt.c
+++ b/drivers/net/wireless/ath/wil6210/interrupt.c
@@ -156,6 +156,19 @@ void wil6210_enable_irq(struct wil6210_priv *wil)
iowrite32(WIL_ICR_ICC_VALUE, wil->csr + HOSTADDR(RGF_DMA_EP_MISC_ICR) +
offsetof(struct RGF_ICR, ICC));
+ /* interrupt moderation parameters */
+ if (wil->wdev->iftype == NL80211_IFTYPE_MONITOR) {
+ /* disable interrupt moderation for monitor
+ * to get better timestamp precision
+ */
+ iowrite32(0, wil->csr + HOSTADDR(RGF_DMA_ITR_CNT_CRL));
+ } else {
+ iowrite32(WIL6210_ITR_TRSH,
+ wil->csr + HOSTADDR(RGF_DMA_ITR_CNT_TRSH));
+ iowrite32(BIT_DMA_ITR_CNT_CRL_EN,
+ wil->csr + HOSTADDR(RGF_DMA_ITR_CNT_CRL));
+ }
+
wil6210_unmask_irq_pseudo(wil);
wil6210_unmask_irq_tx(wil);
wil6210_unmask_irq_rx(wil);
diff --git a/drivers/net/wireless/ath/wil6210/wil6210.h b/drivers/net/wireless/ath/wil6210/wil6210.h
index c4a51638736a..1f91eaf95bbe 100644
--- a/drivers/net/wireless/ath/wil6210/wil6210.h
+++ b/drivers/net/wireless/ath/wil6210/wil6210.h
@@ -39,6 +39,7 @@ static inline u32 WIL_GET_BITS(u32 x, int b0, int b1)
#define WIL6210_MAX_TX_RINGS (24) /* HW limit */
#define WIL6210_MAX_CID (8) /* HW limit */
#define WIL6210_NAPI_BUDGET (16) /* arbitrary */
+#define WIL6210_ITR_TRSH (10000) /* arbitrary - about 15 IRQs/msec */
/* Hardware definitions begin */