net: axienet: reduce default RX interrupt threshold to 1

[ Upstream commit 40da5d680e02ca8d61237192db4b5833d3c9639f ]

Now that NAPI has been implemented, the hardware interrupt mitigation
mechanism is not needed to avoid excessive interrupt load in most cases.
Reduce the default RX interrupt threshold to 1 to reduce introduced
latency. This can be increased with ethtool if desired if some applications
still want to reduce interrupts.

Signed-off-by: Robert Hancock <robert.hancock@calian.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Stable-dep-of: 5a6caa2cfabb ("net: xilinx: axienet: Fix packet counting")
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet.h b/drivers/net/ethernet/xilinx/xilinx_axienet.h
index e8a210201f744727184cdf080a669164a9857cb1..d2c17def082b433fd8d690a1ca4fe007560143f0 100644 (file)
--- a/drivers/net/ethernet/xilinx/xilinx_axienet.h
+++ b/drivers/net/ethernet/xilinx/xilinx_axienet.h
@@ -122,7 +122,7 @@
 /* Default TX/RX Threshold and waitbound values for SGDMA mode */
 #define XAXIDMA_DFT_TX_THRESHOLD       24
 #define XAXIDMA_DFT_TX_WAITBOUND       254
-#define XAXIDMA_DFT_RX_THRESHOLD       24
+#define XAXIDMA_DFT_RX_THRESHOLD       1
 #define XAXIDMA_DFT_RX_WAITBOUND       254
 
 #define XAXIDMA_BD_CTRL_TXSOF_MASK     0x08000000 /* First tx packet */