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ndo_sk_get_lower_dev returns the lower netdev that corresponds to a given socket. Additionally, we implement a helper netdev_sk_get_lowest_dev() to get the lowest one in chain. Signed-off-by: Tariq Toukan <tariqt@nvidia.com> Reviewed-by: Boris Pismenny <borisp@nvidia.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>