net/mlx5e: Prevent adding the same vxlan port
Do not allow the same vxlan udp port to be added to the device more than once. Fixes: b3f63c3d ("net/mlx5e: Add netdev support for VXLAN tunneling") Signed-off-by: Matthew Finlay <matt@mellanox.com> Signed-off-by: Saeed Mahameed <saeedm@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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