IAVF_HARDMTU
ifp->if_hardmtu = IAVF_HARDMTU;
rxq->max_pkt_size = htole32(IAVF_HARDMTU);
IAVF_HARDMTU, 1, IAVF_HARDMTU, 0,
ifp->if_hardmtu = MIN(IAVF_HARDMTU, mtu);