Index: head/sys/dev/alc/if_alc.c
===================================================================
--- head/sys/dev/alc/if_alc.c
+++ head/sys/dev/alc/if_alc.c
@@ -64,6 +64,7 @@
 #include <netinet/in_systm.h>
 #include <netinet/ip.h>
 #include <netinet/tcp.h>
+#include <netinet/netdump/netdump.h>
 
 #include <dev/mii/mii.h>
 #include <dev/mii/miivar.h>
@@ -199,6 +200,7 @@
 static void	alc_start(struct ifnet *);
 static void	alc_start_locked(struct ifnet *);
 static void	alc_start_queue(struct alc_softc *);
+static void	alc_start_tx(struct alc_softc *);
 static void	alc_stats_clear(struct alc_softc *);
 static void	alc_stats_update(struct alc_softc *);
 static void	alc_stop(struct alc_softc *);
@@ -213,6 +215,8 @@
 static int	sysctl_hw_alc_proc_limit(SYSCTL_HANDLER_ARGS);
 static int	sysctl_hw_alc_int_mod(SYSCTL_HANDLER_ARGS);
 
+NETDUMP_DEFINE(alc);
+
 static device_method_t alc_methods[] = {
 	/* Device interface. */
 	DEVMETHOD(device_probe,		alc_probe),
@@ -227,7 +231,7 @@
 	DEVMETHOD(miibus_writereg,	alc_miibus_writereg),
 	DEVMETHOD(miibus_statchg,	alc_miibus_statchg),
 
-	{ NULL, NULL }
+	DEVMETHOD_END
 };
 
 static driver_t alc_driver = {
@@ -1651,6 +1655,9 @@
 		goto fail;
 	}
 
+	/* Attach driver netdump methods. */
+	NETDUMP_SET(ifp, alc);
+
 fail:
 	if (error != 0)
 		alc_detach(dev);
@@ -2974,25 +2981,31 @@
 		ETHER_BPF_MTAP(ifp, m_head);
 	}
 
-	if (enq > 0) {
-		/* Sync descriptors. */
-		bus_dmamap_sync(sc->alc_cdata.alc_tx_ring_tag,
-		    sc->alc_cdata.alc_tx_ring_map, BUS_DMASYNC_PREWRITE);
-		/* Kick. Assume we're using normal Tx priority queue. */
-		if ((sc->alc_flags & ALC_FLAG_AR816X_FAMILY) != 0)
-			CSR_WRITE_2(sc, ALC_MBOX_TD_PRI0_PROD_IDX,
-			    (uint16_t)sc->alc_cdata.alc_tx_prod);
-		else
-			CSR_WRITE_4(sc, ALC_MBOX_TD_PROD_IDX,
-			    (sc->alc_cdata.alc_tx_prod <<
-			    MBOX_TD_PROD_LO_IDX_SHIFT) &
-			    MBOX_TD_PROD_LO_IDX_MASK);
-		/* Set a timeout in case the chip goes out to lunch. */
-		sc->alc_watchdog_timer = ALC_TX_TIMEOUT;
-	}
+	if (enq > 0)
+		alc_start_tx(sc);
 }
 
 static void
+alc_start_tx(struct alc_softc *sc)
+{
+
+	/* Sync descriptors. */
+	bus_dmamap_sync(sc->alc_cdata.alc_tx_ring_tag,
+	    sc->alc_cdata.alc_tx_ring_map, BUS_DMASYNC_PREWRITE);
+	/* Kick. Assume we're using normal Tx priority queue. */
+	if ((sc->alc_flags & ALC_FLAG_AR816X_FAMILY) != 0)
+		CSR_WRITE_2(sc, ALC_MBOX_TD_PRI0_PROD_IDX,
+		    (uint16_t)sc->alc_cdata.alc_tx_prod);
+	else
+		CSR_WRITE_4(sc, ALC_MBOX_TD_PROD_IDX,
+		    (sc->alc_cdata.alc_tx_prod <<
+		    MBOX_TD_PROD_LO_IDX_SHIFT) &
+		    MBOX_TD_PROD_LO_IDX_MASK);
+	/* Set a timeout in case the chip goes out to lunch. */
+	sc->alc_watchdog_timer = ALC_TX_TIMEOUT;
+}
+
+static void
 alc_watchdog(struct alc_softc *sc)
 {
 	struct ifnet *ifp;
@@ -4642,3 +4655,54 @@
 	return (sysctl_int_range(oidp, arg1, arg2, req,
 	    ALC_IM_TIMER_MIN, ALC_IM_TIMER_MAX));
 }
+
+#ifdef NETDUMP
+static void
+alc_netdump_init(struct ifnet *ifp, int *nrxr, int *ncl, int *clsize)
+{
+	struct alc_softc *sc;
+
+	sc = if_getsoftc(ifp);
+	KASSERT(sc->alc_buf_size <= MCLBYTES, ("incorrect cluster size"));
+
+	*nrxr = ALC_RX_RING_CNT;
+	*ncl = NETDUMP_MAX_IN_FLIGHT;
+	*clsize = MCLBYTES;
+}
+
+static void
+alc_netdump_event(struct ifnet *ifp __unused, enum netdump_ev event __unused)
+{
+}
+
+static int
+alc_netdump_transmit(struct ifnet *ifp, struct mbuf *m)
+{
+	struct alc_softc *sc;
+	int error;
+
+	sc = if_getsoftc(ifp);
+	if ((if_getdrvflags(ifp) & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) !=
+	    IFF_DRV_RUNNING)
+		return (EBUSY);
+
+	error = alc_encap(sc, &m);
+	if (error == 0)
+		alc_start_tx(sc);
+	return (error);
+}
+
+static int
+alc_netdump_poll(struct ifnet *ifp, int count)
+{
+	struct alc_softc *sc;
+
+	sc = if_getsoftc(ifp);
+	if ((if_getdrvflags(ifp) & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) !=
+	    IFF_DRV_RUNNING)
+		return (EBUSY);
+
+	alc_txeof(sc);
+	return (alc_rxintr(sc, count));
+}
+#endif /* NETDUMP */