vnic_wq_alloc_ring
err = vnic_wq_alloc_ring(vdev, wq, desc_count, desc_size);
err = vnic_wq_alloc_ring(vdev, wq, 0, desc_count, desc_size);
err = vnic_wq_alloc_ring(vdev, wq, index, desc_count, desc_size);