* For now, kickpcu should hopefully just do nothing - the PCU doesn't need
'kicking' for Osprey and later NICs. The PCU will just restart once
the next FIFO entry is pushed in.
* Teach "proc" about "dosched", so it can be used to just flush the
FIFO contents without adding new FIFO entries.
* .. and now, implement the RX "flush" routine.
* Re-initialise the FIFO contents if the FIFO is empty (the DP is NULL.)
When PCU RX is disabled (ie, writing RX_D to the RX configuration
register) then the FIFO will be completely emptied. If the software FIFO
is full, then no further descriptors are pushed into the FIFO and
things stall.
This all requires much, much more thorough stress testing.
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