netdev: octeon_mgmt: Correct tx IFG workaround.

The previous fix was still too agressive to meet ieee specs.  Increase
to (14, 10).

Signed-off-by: David Daney <david.daney@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/octeon/octeon_mgmt.c b/drivers/net/ethernet/octeon/octeon_mgmt.c
index 921729f..a603faf 100644 (file)
--- a/drivers/net/ethernet/octeon/octeon_mgmt.c
+++ b/drivers/net/ethernet/octeon/octeon_mgmt.c
@@ -1141,10 +1141,13 @@ static int octeon_mgmt_open(struct net_device *netdev)
                /* For compensation state to lock. */
                ndelay(1040 * NS_PER_PHY_CLK);
 
-               /* Some Ethernet switches cannot handle standard
-                * Interframe Gap, increase to 16 bytes.
+               /* Default Interframe Gaps are too small.  Recommended
+                * workaround is.
+                *
+                * AGL_GMX_TX_IFG[IFG1]=14
+                * AGL_GMX_TX_IFG[IFG2]=10
                 */
-               cvmx_write_csr(CVMX_AGL_GMX_TX_IFG, 0x88);
+               cvmx_write_csr(CVMX_AGL_GMX_TX_IFG, 0xae);
        }
 
        octeon_mgmt_rx_fill_ring(netdev);