RDMAP_MASK_OPCODE
return be16_to_cpu(ctrl->ddp_rdmap_ctrl & RDMAP_MASK_OPCODE);
ctrl->ddp_rdmap_ctrl = (ctrl->ddp_rdmap_ctrl & ~RDMAP_MASK_OPCODE) |
(cpu_to_be16(opcode) & RDMAP_MASK_OPCODE);