IGC_RDT
IGC_WRITE_REG(hw, IGC_RDT(i), 0);
IGC_RDT(rxr->me), igc_sysctl_reg_handler, "IU",
IGC_READ_REG(&sc->hw, IGC_RDT(j)));
regs_buff[7] = IGC_READ_REG(hw, IGC_RDT(0));
IGC_WRITE_REG(&sc->hw, IGC_RDT(rxr->me), pidx);