Hi Ben,
Those are not HW errors, note that:
hw.mlxen1.stat.rx_dropped: 0
hw.mlxen1.stat.rx_errors: 0
It seems to be triggered when you are failing to allocate a replacement buffer.
Any chance you ran out of mbufs in the system?
en_rx.c:
mlx4_en_process_rx_cq():
mb = mlx4_en_r
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