Notify users when TX vlan offload feature changed with ethtool.
Relevant command - ethtool -K <eth> txvlan on/off.
Signed-off-by: NIdo Shamay <idos@mellanox.com>
Signed-off-by: NAmir Vadai <amirv@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>