In case ftmac100 is used with a DSA switch, Linux wants to set MTU
to 1504 to accommodate for DSA overhead. With the default max_mtu
it leads to the error message:
ftmac100
92000000.mac eth0: error -22 setting MTU to 1504 to include DSA overhead
ftmac100 supports packet length 1518 (MAX_PKT_SIZE constant), so it is
safe to report it in max_mtu.
Signed-off-by: Sergei Antonov <saproj@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lore.kernel.org/r/20220821160844.474277-1-saproj@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
SET_NETDEV_DEV(netdev, &pdev->dev);
netdev->ethtool_ops = &ftmac100_ethtool_ops;
netdev->netdev_ops = &ftmac100_netdev_ops;
+ netdev->max_mtu = MAX_PKT_SIZE;
platform_set_drvdata(pdev, netdev);