net: ethernet: octeon_mgmt: Account for second possible VLAN header

Octeon's input ring-buffer entry has 14 bits-wide size field, so to account
for second possible VLAN header max_mtu must be further reduced.

Fixes: 109cc16526c6d ("ethernet/cavium: use core min/max MTU checking")
Signed-off-by: Alexander Sverdlin <alexander.sverdlin@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/cavium/octeon/octeon_mgmt.c b/drivers/net/ethernet/cavium/octeon/octeon_mgmt.c
index 0e5de88..cdd7e5d 100644 (file)
--- a/drivers/net/ethernet/cavium/octeon/octeon_mgmt.c
+++ b/drivers/net/ethernet/cavium/octeon/octeon_mgmt.c
@@ -1499,7 +1499,7 @@ static int octeon_mgmt_probe(struct platform_device *pdev)
        netdev->ethtool_ops = &octeon_mgmt_ethtool_ops;
 
        netdev->min_mtu = 64 - OCTEON_MGMT_RX_HEADROOM;
-       netdev->max_mtu = 16383 - OCTEON_MGMT_RX_HEADROOM;
+       netdev->max_mtu = 16383 - OCTEON_MGMT_RX_HEADROOM - VLAN_HLEN;
 
        mac = of_get_mac_address(pdev->dev.of_node);