diff --git a/sys/dev/sfxge/sfxge.h b/sys/dev/sfxge/sfxge.h
--- a/sys/dev/sfxge/sfxge.h
+++ b/sys/dev/sfxge/sfxge.h
@@ -270,7 +270,7 @@
 	struct sx			softc_lock;
 	char				softc_lock_name[SFXGE_LOCK_NAME_MAX];
 	enum sfxge_softc_state		init_state;
-	struct ifnet			*ifnet;
+	if_t				ifnet;
 	unsigned int			if_flags;
 	struct sysctl_oid		*stats_node;
 #if EFSYS_OPT_QSTATS
@@ -338,7 +338,7 @@
 #define	SFXGE_LINK_UP(sc) \
 	((sc)->port.link_mode != EFX_LINK_DOWN && \
 	 (sc)->port.link_mode != EFX_LINK_UNKNOWN)
-#define	SFXGE_RUNNING(sc) ((sc)->ifnet->if_drv_flags & IFF_DRV_RUNNING)
+#define	SFXGE_RUNNING(sc) (if_getdrvflags((sc)->ifnet) & IFF_DRV_RUNNING)
 
 #define	SFXGE_PARAM(_name)	"hw.sfxge." #_name
 
@@ -404,7 +404,7 @@
 				  efx_link_mode_t mode);
 extern int sfxge_mac_filter_set(struct sfxge_softc *sc);
 extern int sfxge_port_ifmedia_init(struct sfxge_softc *sc);
-extern uint64_t sfxge_get_counter(struct ifnet *ifp, ift_counter c);
+extern uint64_t sfxge_get_counter(if_t ifp, ift_counter c);
 
 #define	SFXGE_MAX_MTU (9 * 1024)
 
diff --git a/sys/dev/sfxge/sfxge.c b/sys/dev/sfxge/sfxge.c
--- a/sys/dev/sfxge/sfxge.c
+++ b/sys/dev/sfxge/sfxge.c
@@ -256,8 +256,7 @@
 	sc->init_state = SFXGE_STARTED;
 
 	/* Tell the stack we're running. */
-	sc->ifnet->if_drv_flags |= IFF_DRV_RUNNING;
-	sc->ifnet->if_drv_flags &= ~IFF_DRV_OACTIVE;
+	if_setdrvflagbits(sc->ifnet, IFF_DRV_RUNNING, IFF_DRV_OACTIVE);
 
 	return (0);
 
@@ -321,7 +320,7 @@
 
 	efx_nic_fini(sc->enp);
 
-	sc->ifnet->if_drv_flags &= ~IFF_DRV_RUNNING;
+	if_setdrvflagbits(sc->ifnet, 0, IFF_DRV_RUNNING);
 }
 
 static int
@@ -384,7 +383,7 @@
 }
 
 static int
-sfxge_if_ioctl(struct ifnet *ifp, unsigned long command, caddr_t data)
+sfxge_if_ioctl(if_t ifp, unsigned long command, caddr_t data)
 {
 	struct sfxge_softc *sc;
 	struct ifreq *ifr;
@@ -392,52 +391,52 @@
 	int error;
 
 	ifr = (struct ifreq *)data;
-	sc = ifp->if_softc;
+	sc = if_getsoftc(ifp);
 	error = 0;
 
 	switch (command) {
 	case SIOCSIFFLAGS:
 		SFXGE_ADAPTER_LOCK(sc);
-		if (ifp->if_flags & IFF_UP) {
-			if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
-				if ((ifp->if_flags ^ sc->if_flags) &
+		if (if_getflags(ifp) & IFF_UP) {
+			if (if_getdrvflags(ifp) & IFF_DRV_RUNNING) {
+				if ((if_getflags(ifp) ^ sc->if_flags) &
 				    (IFF_PROMISC | IFF_ALLMULTI)) {
 					sfxge_mac_filter_set(sc);
 				}
 			} else
 				sfxge_start(sc);
 		} else
-			if (ifp->if_drv_flags & IFF_DRV_RUNNING)
+			if (if_getdrvflags(ifp) & IFF_DRV_RUNNING)
 				sfxge_stop(sc);
-		sc->if_flags = ifp->if_flags;
+		sc->if_flags = if_getflags(ifp);
 		SFXGE_ADAPTER_UNLOCK(sc);
 		break;
 	case SIOCSIFMTU:
-		if (ifr->ifr_mtu == ifp->if_mtu) {
+		if (ifr->ifr_mtu == if_getmtu(ifp)) {
 			/* Nothing to do */
 			error = 0;
 		} else if (ifr->ifr_mtu > SFXGE_MAX_MTU) {
 			error = EINVAL;
-		} else if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
-			ifp->if_mtu = ifr->ifr_mtu;
+		} else if (!(if_getdrvflags(ifp) & IFF_DRV_RUNNING)) {
+			if_setmtu(ifp, ifr->ifr_mtu);
 			error = 0;
 		} else {
 			/* Restart required */
 			SFXGE_ADAPTER_LOCK(sc);
 			sfxge_stop(sc);
-			ifp->if_mtu = ifr->ifr_mtu;
+			if_setmtu(ifp, ifr->ifr_mtu);
 			error = sfxge_start(sc);
 			SFXGE_ADAPTER_UNLOCK(sc);
 			if (error != 0) {
-				ifp->if_flags &= ~IFF_UP;
-				ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
+				if_setflagbits(ifp, 0, IFF_UP);
+				if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING);
 				if_down(ifp);
 			}
 		}
 		break;
 	case SIOCADDMULTI:
 	case SIOCDELMULTI:
-		if (ifp->if_drv_flags & IFF_DRV_RUNNING)
+		if (if_getdrvflags(ifp) & IFF_DRV_RUNNING)
 			sfxge_mac_filter_set(sc);
 		break;
 	case SIOCSIFCAP:
@@ -448,7 +447,7 @@
 		SFXGE_ADAPTER_LOCK(sc);
 
 		/* Capabilities to be changed in accordance with request */
-		capchg_mask = ifp->if_capenable ^ reqcap;
+		capchg_mask = if_getcapenable(ifp) ^ reqcap;
 
 		/*
 		 * The networking core already rejects attempts to
@@ -456,11 +455,11 @@
 		 * to reject attempts to disable capabilities that we
 		 * can't (yet) disable.
 		 */
-		KASSERT((reqcap & ~ifp->if_capabilities) == 0,
+		KASSERT((reqcap & ~if_getcapabilities(ifp)) == 0,
 		    ("Unsupported capabilities 0x%x requested 0x%x vs "
 		     "supported 0x%x",
-		     reqcap & ~ifp->if_capabilities,
-		     reqcap , ifp->if_capabilities));
+		     reqcap & ~if_getcapabilities(ifp),
+		     reqcap , if_getcapabilities(ifp)));
 		if (capchg_mask & SFXGE_CAP_FIXED) {
 			error = EINVAL;
 			SFXGE_ADAPTER_UNLOCK(sc);
@@ -484,9 +483,9 @@
 		}
 
 		if (reqcap & IFCAP_TXCSUM) {
-			ifp->if_hwassist |= (CSUM_IP | CSUM_TCP | CSUM_UDP);
+			if_sethwassistbits(ifp, (CSUM_IP | CSUM_TCP | CSUM_UDP), 0);
 		} else {
-			ifp->if_hwassist &= ~(CSUM_IP | CSUM_TCP | CSUM_UDP);
+			if_sethwassistbits(ifp, 0, (CSUM_IP | CSUM_TCP | CSUM_UDP));
 			if (reqcap & IFCAP_TSO4) {
 				reqcap &= ~IFCAP_TSO4;
 				if_printf(ifp,
@@ -494,9 +493,9 @@
 			}
 		}
 		if (reqcap & IFCAP_TXCSUM_IPV6) {
-			ifp->if_hwassist |= (CSUM_TCP_IPV6 | CSUM_UDP_IPV6);
+			if_sethwassistbits(ifp, (CSUM_TCP_IPV6 | CSUM_UDP_IPV6), 0);
 		} else {
-			ifp->if_hwassist &= ~(CSUM_TCP_IPV6 | CSUM_UDP_IPV6);
+			if_sethwassistbits(ifp, 0, (CSUM_TCP_IPV6 | CSUM_UDP_IPV6));
 			if (reqcap & IFCAP_TSO6) {
 				reqcap &= ~IFCAP_TSO6;
 				if_printf(ifp,
@@ -512,7 +511,7 @@
 		 * but both bits are set in IPv4 and IPv6 mbufs.
 		 */
 
-		ifp->if_capenable = reqcap;
+		if_setcapenable(ifp, reqcap);
 
 		SFXGE_ADAPTER_UNLOCK(sc);
 		break;
@@ -567,9 +566,9 @@
 }
 
 static void
-sfxge_ifnet_fini(struct ifnet *ifp)
+sfxge_ifnet_fini(if_t ifp)
 {
-	struct sfxge_softc *sc = ifp->if_softc;
+	struct sfxge_softc *sc = if_getsoftc(ifp);
 
 	SFXGE_ADAPTER_LOCK(sc);
 	sfxge_stop(sc);
@@ -581,7 +580,7 @@
 }
 
 static int
-sfxge_ifnet_init(struct ifnet *ifp, struct sfxge_softc *sc)
+sfxge_ifnet_init(if_t ifp, struct sfxge_softc *sc)
 {
 	const efx_nic_cfg_t *encp = efx_nic_cfg_get(sc->enp);
 	device_t dev;
@@ -591,35 +590,35 @@
 	sc->ifnet = ifp;
 
 	if_initname(ifp, device_get_name(dev), device_get_unit(dev));
-	ifp->if_init = sfxge_if_init;
-	ifp->if_softc = sc;
-	ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
-	ifp->if_ioctl = sfxge_if_ioctl;
+	if_setinitfn(ifp, sfxge_if_init);
+	if_setsoftc(ifp, sc);
+	if_setflags(ifp, IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST);
+	if_setioctlfn(ifp, sfxge_if_ioctl);
 
-	ifp->if_capabilities = SFXGE_CAP;
-	ifp->if_capenable = SFXGE_CAP_ENABLE;
-	ifp->if_hw_tsomax = SFXGE_TSO_MAX_SIZE;
-	ifp->if_hw_tsomaxsegcount = SFXGE_TX_MAPPING_MAX_SEG;
-	ifp->if_hw_tsomaxsegsize = PAGE_SIZE;
+	if_setcapabilities(ifp, SFXGE_CAP);
+	if_setcapenable(ifp, SFXGE_CAP_ENABLE);
+	if_sethwtsomax(ifp, SFXGE_TSO_MAX_SIZE);
+	if_sethwtsomaxsegcount(ifp, SFXGE_TX_MAPPING_MAX_SEG);
+	if_sethwtsomaxsegsize(ifp, PAGE_SIZE);
 
 #ifdef SFXGE_LRO
-	ifp->if_capabilities |= IFCAP_LRO;
-	ifp->if_capenable |= IFCAP_LRO;
+	if_setcapabilitiesbit(ifp, IFCAP_LRO, 0);
+	if_setcapenablebit(ifp, IFCAP_LRO, 0);
 #endif
 
 	if (encp->enc_hw_tx_insert_vlan_enabled) {
-		ifp->if_capabilities |= IFCAP_VLAN_HWTAGGING;
-		ifp->if_capenable |= IFCAP_VLAN_HWTAGGING;
+		if_setcapabilitiesbit(ifp, IFCAP_VLAN_HWTAGGING, 0);
+		if_setcapenablebit(ifp, IFCAP_VLAN_HWTAGGING, 0);
 	}
-	ifp->if_hwassist = CSUM_TCP | CSUM_UDP | CSUM_IP | CSUM_TSO |
-			   CSUM_TCP_IPV6 | CSUM_UDP_IPV6;
+	if_sethwassistbits(ifp, CSUM_TCP | CSUM_UDP | CSUM_IP | CSUM_TSO |
+			   CSUM_TCP_IPV6 | CSUM_UDP_IPV6, 0);
 
 	ether_ifattach(ifp, encp->enc_mac_addr);
 
-	ifp->if_transmit = sfxge_if_transmit;
-	ifp->if_qflush = sfxge_if_qflush;
+	if_settransmitfn(ifp, sfxge_if_transmit);
+	if_setqflushfn(ifp, sfxge_if_qflush);
 
-	ifp->if_get_counter = sfxge_get_counter;
+	if_setgetcounterfn(ifp, sfxge_get_counter);
 
 	DBGPRINT(sc->dev, "ifmedia_init");
 	if ((rc = sfxge_port_ifmedia_init(sc)) != 0)
@@ -1076,7 +1075,7 @@
 sfxge_attach(device_t dev)
 {
 	struct sfxge_softc *sc;
-	struct ifnet *ifp;
+	if_t ifp;
 	int error;
 
 	sc = device_get_softc(dev);
diff --git a/sys/dev/sfxge/sfxge_port.c b/sys/dev/sfxge/sfxge_port.c
--- a/sys/dev/sfxge/sfxge_port.c
+++ b/sys/dev/sfxge/sfxge_port.c
@@ -102,9 +102,9 @@
 }
 
 uint64_t
-sfxge_get_counter(struct ifnet *ifp, ift_counter c)
+sfxge_get_counter(if_t ifp, ift_counter c)
 {
-	struct sfxge_softc *sc = ifp->if_softc;
+	struct sfxge_softc *sc = if_getsoftc(ifp);
 	uint64_t *mac_stats;
 	uint64_t val;
 
@@ -327,7 +327,7 @@
 
 	/* Push link state update to the OS */
 	link_state = (SFXGE_LINK_UP(sc) ? LINK_STATE_UP : LINK_STATE_DOWN);
-	sc->ifnet->if_baudrate = sfxge_link_baudrate[port->link_mode];
+	if_setbaudrate(sc->ifnet, sfxge_link_baudrate[port->link_mode]);
 	if_link_state_change(sc->ifnet, link_state);
 }
 
@@ -373,7 +373,7 @@
 static int
 sfxge_mac_multicast_list_set(struct sfxge_softc *sc)
 {
-	struct ifnet *ifp = sc->ifnet;
+	if_t ifp = sc->ifnet;
 	struct sfxge_port *port = &sc->port;
 	int rc = 0;
 
@@ -400,21 +400,21 @@
 static int
 sfxge_mac_filter_set_locked(struct sfxge_softc *sc)
 {
-	struct ifnet *ifp = sc->ifnet;
+	if_t ifp = sc->ifnet;
 	struct sfxge_port *port = &sc->port;
 	boolean_t all_mulcst;
 	int rc;
 
 	mtx_assert(&port->lock, MA_OWNED);
 
-	all_mulcst = !!(ifp->if_flags & (IFF_PROMISC | IFF_ALLMULTI));
+	all_mulcst = !!(if_getflags(ifp) & (IFF_PROMISC | IFF_ALLMULTI));
 
 	rc = sfxge_mac_multicast_list_set(sc);
 	/* Fallback to all multicast if cannot set multicast list */
 	if (rc != 0)
 		all_mulcst = B_TRUE;
 
-	rc = efx_mac_filter_set(sc->enp, !!(ifp->if_flags & IFF_PROMISC),
+	rc = efx_mac_filter_set(sc->enp, !!(if_getflags(ifp) & IFF_PROMISC),
 				(port->mcast_count > 0), all_mulcst, B_TRUE);
 
 	return (rc);
@@ -483,7 +483,7 @@
 {
 	uint8_t mac_addr[ETHER_ADDR_LEN];
 	struct epoch_tracker et;
-	struct ifnet *ifp = sc->ifnet;
+	if_t ifp = sc->ifnet;
 	struct sfxge_port *port;
 	efx_nic_t *enp;
 	size_t pdu;
@@ -507,7 +507,7 @@
 		goto fail;
 
 	/* Set the SDU */
-	pdu = EFX_MAC_PDU(ifp->if_mtu);
+	pdu = EFX_MAC_PDU(if_getmtu(ifp));
 	if ((rc = efx_mac_pdu_set(enp, pdu)) != 0)
 		goto fail2;
 
@@ -517,8 +517,7 @@
 
 	/* Set the unicast address */
 	NET_EPOCH_ENTER(et);
-	bcopy(LLADDR((struct sockaddr_dl *)ifp->if_addr->ifa_addr),
-	      mac_addr, sizeof(mac_addr));
+	bcopy(if_getlladdr(ifp), mac_addr, sizeof(mac_addr));
 	NET_EPOCH_EXIT(et);
 	if ((rc = efx_mac_addr_set(enp, mac_addr)) != 0)
 		goto fail4;
@@ -860,13 +859,13 @@
 };
 
 static void
-sfxge_media_status(struct ifnet *ifp, struct ifmediareq *ifmr)
+sfxge_media_status(if_t ifp, struct ifmediareq *ifmr)
 {
 	struct sfxge_softc *sc;
 	efx_phy_media_type_t medium_type;
 	efx_link_mode_t mode;
 
-	sc = ifp->if_softc;
+	sc = if_getsoftc(ifp);
 	SFXGE_ADAPTER_LOCK(sc);
 
 	ifmr->ifm_status = IFM_AVALID;
@@ -976,14 +975,14 @@
 }
 
 static int
-sfxge_media_change(struct ifnet *ifp)
+sfxge_media_change(if_t ifp)
 {
 	struct sfxge_softc *sc;
 	struct ifmedia_entry *ifm;
 	int rc;
 	uint32_t phy_cap_mask;
 
-	sc = ifp->if_softc;
+	sc = if_getsoftc(ifp);
 	ifm = sc->media.ifm_cur;
 
 	SFXGE_ADAPTER_LOCK(sc);
diff --git a/sys/dev/sfxge/sfxge_rx.c b/sys/dev/sfxge/sfxge_rx.c
--- a/sys/dev/sfxge/sfxge_rx.c
+++ b/sys/dev/sfxge/sfxge_rx.c
@@ -324,11 +324,11 @@
 
 static void __sfxge_rx_deliver(struct sfxge_softc *sc, struct mbuf *m)
 {
-	struct ifnet *ifp = sc->ifnet;
+	if_t ifp = sc->ifnet;
 
 	m->m_pkthdr.rcvif = ifp;
 	m->m_pkthdr.csum_data = 0xffff;
-	ifp->if_input(ifp, m);
+	if_input(ifp, m);
 }
 
 static void
@@ -812,7 +812,7 @@
 sfxge_rx_qcomplete(struct sfxge_rxq *rxq, boolean_t eop)
 {
 	struct sfxge_softc *sc = rxq->sc;
-	int if_capenable = sc->ifnet->if_capenable;
+	int if_capenable = if_getcapenable(sc->ifnet);
 	int lro_enabled = if_capenable & IFCAP_LRO;
 	unsigned int index;
 	struct sfxge_evq *evq __diagused;
@@ -1094,7 +1094,7 @@
 		return (rc);
 
 	encp = efx_nic_cfg_get(sc->enp);
-	sc->rx_buffer_size = EFX_MAC_PDU(sc->ifnet->if_mtu);
+	sc->rx_buffer_size = EFX_MAC_PDU(if_getmtu(sc->ifnet));
 
 	/* Calculate the receive packet buffer size. */
 	sc->rx_prefix_size = encp->enc_rx_prefix_size;
diff --git a/sys/dev/sfxge/sfxge_tx.h b/sys/dev/sfxge/sfxge_tx.h
--- a/sys/dev/sfxge/sfxge_tx.h
+++ b/sys/dev/sfxge/sfxge_tx.h
@@ -244,7 +244,7 @@
 extern void sfxge_tx_stop(struct sfxge_softc *sc);
 extern void sfxge_tx_qcomplete(struct sfxge_txq *txq, struct sfxge_evq *evq);
 extern void sfxge_tx_qflush_done(struct sfxge_txq *txq);
-extern void sfxge_if_qflush(struct ifnet *ifp);
-extern int sfxge_if_transmit(struct ifnet *ifp, struct mbuf *m);
+extern void sfxge_if_qflush(if_t ifp);
+extern int sfxge_if_transmit(if_t ifp, struct mbuf *m);
 
 #endif
diff --git a/sys/dev/sfxge/sfxge_tx.c b/sys/dev/sfxge/sfxge_tx.c
--- a/sys/dev/sfxge/sfxge_tx.c
+++ b/sys/dev/sfxge/sfxge_tx.c
@@ -780,12 +780,12 @@
 }
 
 void
-sfxge_if_qflush(struct ifnet *ifp)
+sfxge_if_qflush(if_t ifp)
 {
 	struct sfxge_softc *sc;
 	unsigned int i;
 
-	sc = ifp->if_softc;
+	sc = if_getsoftc(ifp);
 
 	for (i = 0; i < sc->txq_count; i++)
 		sfxge_tx_qdpl_flush(sc->txq[i]);
@@ -872,13 +872,13 @@
  * TX start -- called by the stack.
  */
 int
-sfxge_if_transmit(struct ifnet *ifp, struct mbuf *m)
+sfxge_if_transmit(if_t ifp, struct mbuf *m)
 {
 	struct sfxge_softc *sc;
 	struct sfxge_txq *txq;
 	int rc;
 
-	sc = (struct sfxge_softc *)ifp->if_softc;
+	sc = (struct sfxge_softc *)if_getsoftc(ifp);
 
 	/*
 	 * Transmit may be called when interface is up from the kernel
@@ -888,7 +888,7 @@
 	 * point of view, but already down from the kernel point of
 	 * view. I.e. Rx when interface shutdown is in progress.
 	 */
-	KASSERT((ifp->if_flags & IFF_UP) || (sc->if_flags & IFF_UP),
+	KASSERT((if_getflags(ifp) & IFF_UP) || (sc->if_flags & IFF_UP),
 		("interface not up"));
 
 	/* Pick the desired transmit queue. */