IGC_IVAR_VALID
ivar |= (rx_que->msix | IGC_IVAR_VALID) << 16;
ivar |= rx_que->msix | IGC_IVAR_VALID;
ivar |= (tx_que->msix | IGC_IVAR_VALID) << 24;
ivar |= (tx_que->msix | IGC_IVAR_VALID) << 8;
ivar = (sc->linkvec | IGC_IVAR_VALID) << 8;