IAVF_ITR_RX
iavf_wr(sc, I40E_VFINT_ITRN1(IAVF_ITR_RX, i), sc->sc_rx_itr);
iavf_wr(sc, I40E_VFINT_ITR01(IAVF_ITR_RX), sc->sc_rx_itr);
vec[num_vec].rxitr_idx = htole16(IAVF_ITR_RX);
itr = IAVF_ITR_RX;