Don't write CSR tail until we processed enough TX descriptors.
To avoid crypto operations sitting in the TX ring indefinitely,
the "force write" threshold is used:
- on TX, no tail write coalescing will occur if number of inflights
is below force write threshold
- on RX, check if we have a number of crypto ops enqueued that is
below force write threshold that are not yet submitted to
processing.
Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
Acked-by: Fiona Trahe <fiona.trahe@intel.com>
82982e1766