read_uctxt_csr
head = (read_uctxt_csr(rcd->dd, rcd->ctxt, RCV_HDR_HEAD)
tail = read_uctxt_csr(rcd->dd, rcd->ctxt, RCV_HDR_TAIL);
read_uctxt_csr(dd, ctxt, RCV_HDR_HEAD);
read_uctxt_csr(dd, ctxt, RCV_HDR_HEAD);
tail = (u32)read_uctxt_csr(rcd->dd, rcd->ctxt, RCV_HDR_TAIL);
read_uctxt_csr(rcd->dd, rcd->ctxt, RCV_HDR_HEAD) &
read_uctxt_csr(rcd->dd, rcd->ctxt, RCV_HDR_TAIL),
reg = read_uctxt_csr(dd, ctxt, RCV_TID_FLOW_TABLE + (8 * fidx));