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Various ndo_set_config() methods can change dev->if_port

dev->if_port is going to be read locklessly from
rtnl_fill_link_ifmap().

Add corresponding WRITE_ONCE() on writer sides.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/r/20240507184144.1230469-1-edumazet@google.com

Signed-off-by: Jakub Kicinski <kuba@kernel.org>