RFD_STS_OFFSET
SYNCRFD(rfd, RFD_STS_OFFSET, 2, DDI_DMA_SYNC_FORKERNEL);
if ((GETRFD16(rfd, RFD_STS_OFFSET) & RFD_STS_C) == 0) {
sts = GETRFD16(rfd, RFD_STS_OFFSET);