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Use a helper function to access netdevs using a port number.
This patch removes code repetitions as well as removes the need
to explicitly use gdma_dev, which was error-prone.
Signed-off-by: Konstantin Taranov <kotaranov@microsoft.com>
Link: https://lore.kernel.org/r/1705965781-3235-3-git-send-email-kotaranov@linux.microsoft.com

Signed-off-by: Leon Romanovsky <leon@kernel.org>