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>

1 files changed, 6 insertions, 3 deletions

diff --git a/drivers/net/ethernet/octeon/octeon_mgmt.c b/drivers/net/ethernet/octeon/octeon_mgmt.c
index 921729f9c85c..a603faf64a9f 100644
--- 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);