In the IOV scenario, multi RX queues can be assigned
to one VF. If the dropping is not enabled, when no
descriptors are available for one queue, this queue
can block others.
Fixes: 00e30184daa0 ("ixgbe: add PF support")
CC: stable@dpdk.org
Suggested-by: Liang-min Wang <redacted>
Signed-off-by: Wenzhuo Lu <redacted>