ixgbe: fix X540 ethtool loopback test.

On X540 we need to set the MACC.FLU bit to 1 in order to force the link
up before entering MAC loopback.  This is only used in the ethtool loopback
test, which was failing.  This patch corrects it.

Signed-off-by: Don Skidmore <donald.c.skidmore@intel.com>
Tested-by: Evan Swanson <evan.swanson@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ixgbe/ixgbe_ethtool.c b/drivers/net/ixgbe/ixgbe_ethtool.c
index 6cf1c71..bd7524e 100644 (file)
--- a/drivers/net/ixgbe/ixgbe_ethtool.c
+++ b/drivers/net/ixgbe/ixgbe_ethtool.c
@@ -1595,6 +1595,13 @@ static int ixgbe_setup_loopback_test(struct ixgbe_adapter *adapter)
        struct ixgbe_hw *hw = &adapter->hw;
        u32 reg_data;
 
+       /* X540 needs to set the MACC.FLU bit to force link up */
+       if (adapter->hw.mac.type == ixgbe_mac_X540) {
+               reg_data = IXGBE_READ_REG(&adapter->hw, IXGBE_MACC);
+               reg_data |= IXGBE_MACC_FLU;
+               IXGBE_WRITE_REG(&adapter->hw, IXGBE_MACC, reg_data);
+       }
+
        /* right now we only support MAC loopback in the driver */
        reg_data = IXGBE_READ_REG(&adapter->hw, IXGBE_HLREG0);
        /* Setup MAC loopback */