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The dev_rx_discards counter will increment by one when an interface is toggled up and down. The main reason is that the driver first sends a `NFP_NET_CFG_CTRL_ENABLE` configuration packet to the NIC to perform port initialisation when an interface is set up. But there is a race between physical link up and free list queue initialization which may lead to the configuration packet being discarded. To address this problem a new bit NFP_NET_CFG_CTRL_FREELIST_EN is added to perform free list initialisation on the NIC. The FREELIST_EN should be sent in advance to initialize free list queue. When a port is set to down, FREELIST_EN should be sent after CTRL_ENABLE to avoid packet discards. Signed-off-by: Ziyang Chen <ziyang.chen@corigine.com> Acked-by: Simon Horman <simon.horman@corigine.com> Signed-off-by: Louis Peens <louis.peens@corigine.com> Link: https://lore.kernel.org/r/20230712123551.13858-1-louis.peens@corigine.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>