A simple array based FIFO of pointers.  Intended for net stack which
commonly has a single consumer/producer.
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
Acked-by: NJesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>