Hi,
It appears iflib has a little defect. When the system temporarily runs
out of mbufs, iflib based network drivers stop receiving packets
forever, even when the mbuf zone recover.
In mlx5en(4) which doesn't use iflib we have a special watchdog/callout
to retry filling the RX DMA ring when we are out of mbufs. Can iflib do
the same?
[zone: mbuf_cluster] kern.ipc.nmbclusters limit reached
Simply doing "ifconfig down" and "ifconfig up" recovers the adapter:
igb0: link state changed to DOWN
igb0: link state changed to UP
--HPS
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