HNS_RCB_TX_PKTLINE_OFFSET
ring_pair->port_id_in_comm + HNS_RCB_TX_PKTLINE_OFFSET);
reg = RCB_CFG_PKTLINE_REG + (port_idx + HNS_RCB_TX_PKTLINE_OFFSET) * 4;
reg = RCB_CFG_PKTLINE_REG + (port_idx + HNS_RCB_TX_PKTLINE_OFFSET) * 4;