BUF_Q_PTR_SPACE
(rx_ring->cq_id * sizeof (uint64_t) * BUF_Q_PTR_SPACE);
(rx_ring->cq_id * sizeof (uint64_t) * BUF_Q_PTR_SPACE);
buf_q_base_reg += ((BUF_Q_PTR_SPACE / 2) * sizeof (uint64_t));
buf_q_base_reg_dma += ((BUF_Q_PTR_SPACE / 2) * sizeof (uint64_t));