HW filtering and sink core (flow sampling) not compatible

[thearossman]

At least on our MLNX CX-5 NICs, configuring a sink core and hardware assist (HW filtering support) at the same time is impossible.

This appears that this is because configuring a sink core and configuring a hardware filter are done separately, and both modify the same redirection table on the same NIC. We observe that requesting a HW filter and a sink core leads to the sink core configuration being overwritten.

This isn't a big deal, as the SW packet filter is generally inexpensive. However, it would be nice to have a workaround.