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Old 08-03-2012, 01:24 AM
Ike Panhc
 
Default UBUNTU: (drop after 3.6-rc1) net: calxedaxgmac: enable rx cut-thru mode

From: Rob Herring <rob.herring@calxeda.com>

BugLink: http://launchpad.net/bugs/1008345

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>
(cherry picked from commit f62a23a7cb601fb30c4a8b8a5ba1c6bb7f5148b3)

Signed-off-by: Ike Panhc <ike.pan@canonical.com>
---
drivers/net/ethernet/calxeda/xgmac.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/calxeda/xgmac.c b/drivers/net/ethernet/calxeda/xgmac.c
index 8fc5fd0..dd08033 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 */
@@ -985,7 +985,8 @@ 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 */
--
1.7.9.5


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