net: calxedaxgmac: enable rx cut-thru mode

Enabling RX cut-thru mode yields better performance as received frames
start getting written to memory before a whole frame is received.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/net/ethernet/calxeda/xgmac.c b/drivers/net/ethernet/calxeda/xgmac.c
index abb8f40ec221..2b4b4f529ab4 100644
--- a/drivers/net/ethernet/calxeda/xgmac.c
+++ b/drivers/net/ethernet/calxeda/xgmac.c
@@ -264,7 +264,7 @@
 #define XGMAC_OMR_FEF           0x00000080      /* Forward Error Frames */
 #define XGMAC_OMR_DT            0x00000040      /* Drop TCP/IP csum Errors */
 #define XGMAC_OMR_RSF           0x00000020      /* RX FIFO Store and Forward */
-#define XGMAC_OMR_RTC           0x00000010      /* RX Threshhold Ctrl */
+#define XGMAC_OMR_RTC_256       0x00000018      /* RX Threshhold Ctrl */
 #define XGMAC_OMR_RTC_MASK      0x00000018      /* RX Threshhold Ctrl MASK */
 
 /* XGMAC HW Features Register */
@@ -982,7 +982,8 @@ static int xgmac_hw_init(struct net_device *dev)
         writel(value, ioaddr + XGMAC_DMA_CONTROL);
 
         /* Set the HW DMA mode and the COE */
-        writel(XGMAC_OMR_TSF | XGMAC_OMR_RSF | XGMAC_OMR_RFD | XGMAC_OMR_RFA,
+        writel(XGMAC_OMR_TSF | XGMAC_OMR_RFD | XGMAC_OMR_RFA |
+                XGMAC_OMR_RTC_256,
                 ioaddr + XGMAC_OMR);
 
         /* Reset the MMC counters */