Move files to match FreeBSD layout

1 files changed, 1808 insertions, 0 deletions

diff --git a/freebsd/sys/net/if_lagg.c b/freebsd/sys/net/if_lagg.c
new file mode 100644
index 00000000..47c72ca2
--- /dev/null
+++ b/freebsd/sys/net/if_lagg.c
@@ -0,0 +1,1808 @@
+#include <freebsd/machine/rtems-bsd-config.h>
+
+/*	$OpenBSD: if_trunk.c,v 1.30 2007/01/31 06:20:19 reyk Exp $	*/
+
+/*
+ * Copyright (c) 2005, 2006 Reyk Floeter <reyk@openbsd.org>
+ * Copyright (c) 2007 Andrew Thompson <thompsa@FreeBSD.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <freebsd/sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <freebsd/local/opt_inet.h>
+#include <freebsd/local/opt_inet6.h>
+
+#include <freebsd/sys/param.h>
+#include <freebsd/sys/kernel.h>
+#include <freebsd/sys/malloc.h>
+#include <freebsd/sys/mbuf.h>
+#include <freebsd/sys/queue.h>
+#include <freebsd/sys/socket.h>
+#include <freebsd/sys/sockio.h>
+#include <freebsd/sys/sysctl.h>
+#include <freebsd/sys/module.h>
+#include <freebsd/sys/priv.h>
+#include <freebsd/sys/systm.h>
+#include <freebsd/sys/proc.h>
+#include <freebsd/sys/hash.h>
+#include <freebsd/sys/lock.h>
+#include <freebsd/sys/rwlock.h>
+#include <freebsd/sys/taskqueue.h>
+#include <freebsd/sys/eventhandler.h>
+
+#include <freebsd/net/ethernet.h>
+#include <freebsd/net/if.h>
+#include <freebsd/net/if_clone.h>
+#include <freebsd/net/if_arp.h>
+#include <freebsd/net/if_dl.h>
+#include <freebsd/net/if_llc.h>
+#include <freebsd/net/if_media.h>
+#include <freebsd/net/if_types.h>
+#include <freebsd/net/if_var.h>
+#include <freebsd/net/bpf.h>
+
+#ifdef INET
+#include <freebsd/netinet/in.h>
+#include <freebsd/netinet/in_systm.h>
+#include <freebsd/netinet/if_ether.h>
+#include <freebsd/netinet/ip.h>
+#endif
+
+#ifdef INET6
+#include <freebsd/netinet/ip6.h>
+#endif
+
+#include <freebsd/net/if_vlan_var.h>
+#include <freebsd/net/if_lagg.h>
+#include <freebsd/net/ieee8023ad_lacp.h>
+
+/* Special flags we should propagate to the lagg ports. */
+static struct {
+	int flag;
+	int (*func)(struct ifnet *, int);
+} lagg_pflags[] = {
+	{IFF_PROMISC, ifpromisc},
+	{IFF_ALLMULTI, if_allmulti},
+	{0, NULL}
+};
+
+SLIST_HEAD(__trhead, lagg_softc) lagg_list;	/* list of laggs */
+static struct mtx	lagg_list_mtx;
+eventhandler_tag	lagg_detach_cookie = NULL;
+
+static int	lagg_clone_create(struct if_clone *, int, caddr_t);
+static void	lagg_clone_destroy(struct ifnet *);
+static void	lagg_lladdr(struct lagg_softc *, uint8_t *);
+static void	lagg_capabilities(struct lagg_softc *);
+static void	lagg_port_lladdr(struct lagg_port *, uint8_t *);
+static void	lagg_port_setlladdr(void *, int);
+static int	lagg_port_create(struct lagg_softc *, struct ifnet *);
+static int	lagg_port_destroy(struct lagg_port *, int);
+static struct mbuf *lagg_input(struct ifnet *, struct mbuf *);
+static void	lagg_linkstate(struct lagg_softc *);
+static void	lagg_port_state(struct ifnet *, int);
+static int	lagg_port_ioctl(struct ifnet *, u_long, caddr_t);
+static int	lagg_port_output(struct ifnet *, struct mbuf *,
+		    struct sockaddr *, struct route *);
+static void	lagg_port_ifdetach(void *arg __unused, struct ifnet *);
+static int	lagg_port_checkstacking(struct lagg_softc *);
+static void	lagg_port2req(struct lagg_port *, struct lagg_reqport *);
+static void	lagg_init(void *);
+static void	lagg_stop(struct lagg_softc *);
+static int	lagg_ioctl(struct ifnet *, u_long, caddr_t);
+static int	lagg_ether_setmulti(struct lagg_softc *);
+static int	lagg_ether_cmdmulti(struct lagg_port *, int);
+static	int	lagg_setflag(struct lagg_port *, int, int,
+		    int (*func)(struct ifnet *, int));
+static	int	lagg_setflags(struct lagg_port *, int status);
+static void	lagg_start(struct ifnet *);
+static int	lagg_media_change(struct ifnet *);
+static void	lagg_media_status(struct ifnet *, struct ifmediareq *);
+static struct lagg_port *lagg_link_active(struct lagg_softc *,
+	    struct lagg_port *);
+static const void *lagg_gethdr(struct mbuf *, u_int, u_int, void *);
+
+IFC_SIMPLE_DECLARE(lagg, 0);
+
+/* Simple round robin */
+static int	lagg_rr_attach(struct lagg_softc *);
+static int	lagg_rr_detach(struct lagg_softc *);
+static int	lagg_rr_start(struct lagg_softc *, struct mbuf *);
+static struct mbuf *lagg_rr_input(struct lagg_softc *, struct lagg_port *,
+		    struct mbuf *);
+
+/* Active failover */
+static int	lagg_fail_attach(struct lagg_softc *);
+static int	lagg_fail_detach(struct lagg_softc *);
+static int	lagg_fail_start(struct lagg_softc *, struct mbuf *);
+static struct mbuf *lagg_fail_input(struct lagg_softc *, struct lagg_port *,
+		    struct mbuf *);
+
+/* Loadbalancing */
+static int	lagg_lb_attach(struct lagg_softc *);
+static int	lagg_lb_detach(struct lagg_softc *);
+static int	lagg_lb_port_create(struct lagg_port *);
+static void	lagg_lb_port_destroy(struct lagg_port *);
+static int	lagg_lb_start(struct lagg_softc *, struct mbuf *);
+static struct mbuf *lagg_lb_input(struct lagg_softc *, struct lagg_port *,
+		    struct mbuf *);
+static int	lagg_lb_porttable(struct lagg_softc *, struct lagg_port *);
+
+/* 802.3ad LACP */
+static int	lagg_lacp_attach(struct lagg_softc *);
+static int	lagg_lacp_detach(struct lagg_softc *);
+static int	lagg_lacp_start(struct lagg_softc *, struct mbuf *);
+static struct mbuf *lagg_lacp_input(struct lagg_softc *, struct lagg_port *,
+		    struct mbuf *);
+static void	lagg_lacp_lladdr(struct lagg_softc *);
+
+/* lagg protocol table */
+static const struct {
+	int			ti_proto;
+	int			(*ti_attach)(struct lagg_softc *);
+} lagg_protos[] = {
+	{ LAGG_PROTO_ROUNDROBIN,	lagg_rr_attach },
+	{ LAGG_PROTO_FAILOVER,		lagg_fail_attach },
+	{ LAGG_PROTO_LOADBALANCE,	lagg_lb_attach },
+	{ LAGG_PROTO_ETHERCHANNEL,	lagg_lb_attach },
+	{ LAGG_PROTO_LACP,		lagg_lacp_attach },
+	{ LAGG_PROTO_NONE,		NULL }
+};
+
+SYSCTL_DECL(_net_link);
+SYSCTL_NODE(_net_link, OID_AUTO, lagg, CTLFLAG_RW, 0, "Link Aggregation");
+
+static int lagg_failover_rx_all = 0; /* Allow input on any failover links */
+SYSCTL_INT(_net_link_lagg, OID_AUTO, failover_rx_all, CTLFLAG_RW,
+    &lagg_failover_rx_all, 0,
+    "Accept input from any interface in a failover lagg");
+
+static int
+lagg_modevent(module_t mod, int type, void *data)
+{
+
+	switch (type) {
+	case MOD_LOAD:
+		mtx_init(&lagg_list_mtx, "if_lagg list", NULL, MTX_DEF);
+		SLIST_INIT(&lagg_list);
+		if_clone_attach(&lagg_cloner);
+		lagg_input_p = lagg_input;
+		lagg_linkstate_p = lagg_port_state;
+		lagg_detach_cookie = EVENTHANDLER_REGISTER(
+		    ifnet_departure_event, lagg_port_ifdetach, NULL,
+		    EVENTHANDLER_PRI_ANY);
+		break;
+	case MOD_UNLOAD:
+		EVENTHANDLER_DEREGISTER(ifnet_departure_event,
+		    lagg_detach_cookie);
+		if_clone_detach(&lagg_cloner);
+		lagg_input_p = NULL;
+		lagg_linkstate_p = NULL;
+		mtx_destroy(&lagg_list_mtx);
+		break;
+	default:
+		return (EOPNOTSUPP);
+	}
+	return (0);
+}
+
+static moduledata_t lagg_mod = {
+	"if_lagg",
+	lagg_modevent,
+	0
+};
+
+DECLARE_MODULE(if_lagg, lagg_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
+
+#if __FreeBSD_version >= 800000
+/*
+ * This routine is run via an vlan
+ * config EVENT
+ */
+static void
+lagg_register_vlan(void *arg, struct ifnet *ifp, u_int16_t vtag)
+{
+        struct lagg_softc       *sc = ifp->if_softc;
+        struct lagg_port        *lp;
+
+        if (ifp->if_softc !=  arg)   /* Not our event */
+                return;
+
+        LAGG_RLOCK(sc);
+        if (!SLIST_EMPTY(&sc->sc_ports)) {
+                SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
+                        EVENTHANDLER_INVOKE(vlan_config, lp->lp_ifp, vtag);
+        }
+        LAGG_RUNLOCK(sc);
+}
+
+/*
+ * This routine is run via an vlan
+ * unconfig EVENT
+ */
+static void
+lagg_unregister_vlan(void *arg, struct ifnet *ifp, u_int16_t vtag)
+{
+        struct lagg_softc       *sc = ifp->if_softc;
+        struct lagg_port        *lp;
+
+        if (ifp->if_softc !=  arg)   /* Not our event */
+                return;
+
+        LAGG_RLOCK(sc);
+        if (!SLIST_EMPTY(&sc->sc_ports)) {
+                SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
+                        EVENTHANDLER_INVOKE(vlan_unconfig, lp->lp_ifp, vtag);
+        }
+        LAGG_RUNLOCK(sc);
+}
+#endif
+
+static int
+lagg_clone_create(struct if_clone *ifc, int unit, caddr_t params)
+{
+	struct lagg_softc *sc;
+	struct ifnet *ifp;
+	int i, error = 0;
+	static const u_char eaddr[6];	/* 00:00:00:00:00:00 */
+
+	sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO);
+	ifp = sc->sc_ifp = if_alloc(IFT_ETHER);
+	if (ifp == NULL) {
+		free(sc, M_DEVBUF);
+		return (ENOSPC);
+	}
+
+	sc->sc_proto = LAGG_PROTO_NONE;
+	for (i = 0; lagg_protos[i].ti_proto != LAGG_PROTO_NONE; i++) {
+		if (lagg_protos[i].ti_proto == LAGG_PROTO_DEFAULT) {
+			sc->sc_proto = lagg_protos[i].ti_proto;
+			if ((error = lagg_protos[i].ti_attach(sc)) != 0) {
+				if_free_type(ifp, IFT_ETHER);
+				free(sc, M_DEVBUF);
+				return (error);
+			}
+			break;
+		}
+	}
+	LAGG_LOCK_INIT(sc);
+	SLIST_INIT(&sc->sc_ports);
+	TASK_INIT(&sc->sc_lladdr_task, 0, lagg_port_setlladdr, sc);
+
+	/* Initialise pseudo media types */
+	ifmedia_init(&sc->sc_media, 0, lagg_media_change,
+	    lagg_media_status);
+	ifmedia_add(&sc->sc_media, IFM_ETHER | IFM_AUTO, 0, NULL);
+	ifmedia_set(&sc->sc_media, IFM_ETHER | IFM_AUTO);
+
+	if_initname(ifp, ifc->ifc_name, unit);
+	ifp->if_type = IFT_ETHER;
+	ifp->if_softc = sc;
+	ifp->if_start = lagg_start;
+	ifp->if_init = lagg_init;
+	ifp->if_ioctl = lagg_ioctl;
+	ifp->if_flags = IFF_SIMPLEX | IFF_BROADCAST | IFF_MULTICAST;
+
+	IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
+	ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
+	IFQ_SET_READY(&ifp->if_snd);
+
+	/*
+	 * Attach as an ordinary ethernet device, childs will be attached
+	 * as special device IFT_IEEE8023ADLAG.
+	 */
+	ether_ifattach(ifp, eaddr);
+
+#if __FreeBSD_version >= 800000
+	sc->vlan_attach = EVENTHANDLER_REGISTER(vlan_config,
+		lagg_register_vlan, sc, EVENTHANDLER_PRI_FIRST);
+	sc->vlan_detach = EVENTHANDLER_REGISTER(vlan_unconfig,
+		lagg_unregister_vlan, sc, EVENTHANDLER_PRI_FIRST);
+#endif
+
+	/* Insert into the global list of laggs */
+	mtx_lock(&lagg_list_mtx);
+	SLIST_INSERT_HEAD(&lagg_list, sc, sc_entries);
+	mtx_unlock(&lagg_list_mtx);
+
+	return (0);
+}
+
+static void
+lagg_clone_destroy(struct ifnet *ifp)
+{
+	struct lagg_softc *sc = (struct lagg_softc *)ifp->if_softc;
+	struct lagg_port *lp;
+
+	LAGG_WLOCK(sc);
+
+	lagg_stop(sc);
+	ifp->if_flags &= ~IFF_UP;
+
+#if __FreeBSD_version >= 800000
+	EVENTHANDLER_DEREGISTER(vlan_config, sc->vlan_attach);
+	EVENTHANDLER_DEREGISTER(vlan_unconfig, sc->vlan_detach);
+#endif
+
+	/* Shutdown and remove lagg ports */
+	while ((lp = SLIST_FIRST(&sc->sc_ports)) != NULL)
+		lagg_port_destroy(lp, 1);
+	/* Unhook the aggregation protocol */
+	(*sc->sc_detach)(sc);
+
+	LAGG_WUNLOCK(sc);
+
+	ifmedia_removeall(&sc->sc_media);
+	ether_ifdetach(ifp);
+	if_free_type(ifp, IFT_ETHER);
+
+	mtx_lock(&lagg_list_mtx);
+	SLIST_REMOVE(&lagg_list, sc, lagg_softc, sc_entries);
+	mtx_unlock(&lagg_list_mtx);
+
+	taskqueue_drain(taskqueue_swi, &sc->sc_lladdr_task);
+	LAGG_LOCK_DESTROY(sc);
+	free(sc, M_DEVBUF);
+}
+
+static void
+lagg_lladdr(struct lagg_softc *sc, uint8_t *lladdr)
+{
+	struct ifnet *ifp = sc->sc_ifp;
+
+	if (memcmp(lladdr, IF_LLADDR(ifp), ETHER_ADDR_LEN) == 0)
+		return;
+
+	bcopy(lladdr, IF_LLADDR(ifp), ETHER_ADDR_LEN);
+	/* Let the protocol know the MAC has changed */
+	if (sc->sc_lladdr != NULL)
+		(*sc->sc_lladdr)(sc);
+	EVENTHANDLER_INVOKE(iflladdr_event, ifp);
+}
+
+static void
+lagg_capabilities(struct lagg_softc *sc)
+{
+	struct lagg_port *lp;
+	int cap = ~0, ena = ~0;
+	u_long hwa = ~0UL;
+
+	LAGG_WLOCK_ASSERT(sc);
+
+	/* Get capabilities from the lagg ports */
+	SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
+		cap &= lp->lp_ifp->if_capabilities;
+		ena &= lp->lp_ifp->if_capenable;
+		hwa &= lp->lp_ifp->if_hwassist;
+	}
+	cap = (cap == ~0 ? 0 : cap);
+	ena = (ena == ~0 ? 0 : ena);
+	hwa = (hwa == ~0 ? 0 : hwa);
+
+	if (sc->sc_ifp->if_capabilities != cap ||
+	    sc->sc_ifp->if_capenable != ena ||
+	    sc->sc_ifp->if_hwassist != hwa) {
+		sc->sc_ifp->if_capabilities = cap;
+		sc->sc_ifp->if_capenable = ena;
+		sc->sc_ifp->if_hwassist = hwa;
+		getmicrotime(&sc->sc_ifp->if_lastchange);
+
+		if (sc->sc_ifflags & IFF_DEBUG)
+			if_printf(sc->sc_ifp,
+			    "capabilities 0x%08x enabled 0x%08x\n", cap, ena);
+	}
+}
+
+static void
+lagg_port_lladdr(struct lagg_port *lp, uint8_t *lladdr)
+{
+	struct lagg_softc *sc = lp->lp_softc;
+	struct ifnet *ifp = lp->lp_ifp;
+	struct lagg_llq *llq;
+	int pending = 0;
+
+	LAGG_WLOCK_ASSERT(sc);
+
+	if (lp->lp_detaching ||
+	    memcmp(lladdr, IF_LLADDR(ifp), ETHER_ADDR_LEN) == 0)
+		return;
+
+	/* Check to make sure its not already queued to be changed */
+	SLIST_FOREACH(llq, &sc->sc_llq_head, llq_entries) {
+		if (llq->llq_ifp == ifp) {
+			pending = 1;
+			break;
+		}
+	}
+
+	if (!pending) {
+		llq = malloc(sizeof(struct lagg_llq), M_DEVBUF, M_NOWAIT);
+		if (llq == NULL)	/* XXX what to do */
+			return;
+	}
+
+	/* Update the lladdr even if pending, it may have changed */
+	llq->llq_ifp = ifp;
+	bcopy(lladdr, llq->llq_lladdr, ETHER_ADDR_LEN);
+
+	if (!pending)
+		SLIST_INSERT_HEAD(&sc->sc_llq_head, llq, llq_entries);
+
+	taskqueue_enqueue(taskqueue_swi, &sc->sc_lladdr_task);
+}
+
+/*
+ * Set the interface MAC address from a taskqueue to avoid a LOR.
+ */
+static void
+lagg_port_setlladdr(void *arg, int pending)
+{
+	struct lagg_softc *sc = (struct lagg_softc *)arg;
+	struct lagg_llq *llq, *head;
+	struct ifnet *ifp;
+	int error;
+
+	/* Grab a local reference of the queue and remove it from the softc */
+	LAGG_WLOCK(sc);
+	head = SLIST_FIRST(&sc->sc_llq_head);
+	SLIST_FIRST(&sc->sc_llq_head) = NULL;
+	LAGG_WUNLOCK(sc);
+
+	/*
+	 * Traverse the queue and set the lladdr on each ifp. It is safe to do
+	 * unlocked as we have the only reference to it.
+	 */
+	for (llq = head; llq != NULL; llq = head) {
+		ifp = llq->llq_ifp;
+
+		/* Set the link layer address */
+		error = if_setlladdr(ifp, llq->llq_lladdr, ETHER_ADDR_LEN);
+		if (error)
+			printf("%s: setlladdr failed on %s\n", __func__,
+			    ifp->if_xname);
+
+		head = SLIST_NEXT(llq, llq_entries);
+		free(llq, M_DEVBUF);
+	}
+}
+
+static int
+lagg_port_create(struct lagg_softc *sc, struct ifnet *ifp)
+{
+	struct lagg_softc *sc_ptr;
+	struct lagg_port *lp;
+	int error = 0;
+
+	LAGG_WLOCK_ASSERT(sc);
+
+	/* Limit the maximal number of lagg ports */
+	if (sc->sc_count >= LAGG_MAX_PORTS)
+		return (ENOSPC);
+
+	/* Check if port has already been associated to a lagg */
+	if (ifp->if_lagg != NULL)
+		return (EBUSY);
+
+	/* XXX Disallow non-ethernet interfaces (this should be any of 802) */
+	if (ifp->if_type != IFT_ETHER)
+		return (EPROTONOSUPPORT);
+
+	/* Allow the first Ethernet member to define the MTU */
+	if (SLIST_EMPTY(&sc->sc_ports))
+		sc->sc_ifp->if_mtu = ifp->if_mtu;
+	else if (sc->sc_ifp->if_mtu != ifp->if_mtu) {
+		if_printf(sc->sc_ifp, "invalid MTU for %s\n",
+		    ifp->if_xname);
+		return (EINVAL);
+	}
+
+	if ((lp = malloc(sizeof(struct lagg_port),
+	    M_DEVBUF, M_NOWAIT|M_ZERO)) == NULL)
+		return (ENOMEM);
+
+	/* Check if port is a stacked lagg */
+	mtx_lock(&lagg_list_mtx);
+	SLIST_FOREACH(sc_ptr, &lagg_list, sc_entries) {
+		if (ifp == sc_ptr->sc_ifp) {
+			mtx_unlock(&lagg_list_mtx);
+			free(lp, M_DEVBUF);
+			return (EINVAL);
+			/* XXX disable stacking for the moment, its untested
+			lp->lp_flags |= LAGG_PORT_STACK;
+			if (lagg_port_checkstacking(sc_ptr) >=
+			    LAGG_MAX_STACKING) {
+				mtx_unlock(&lagg_list_mtx);
+				free(lp, M_DEVBUF);
+				return (E2BIG);
+			}
+			*/
+		}
+	}
+	mtx_unlock(&lagg_list_mtx);
+
+	/* Change the interface type */
+	lp->lp_iftype = ifp->if_type;
+	ifp->if_type = IFT_IEEE8023ADLAG;
+	ifp->if_lagg = lp;
+	lp->lp_ioctl = ifp->if_ioctl;
+	ifp->if_ioctl = lagg_port_ioctl;
+	lp->lp_output = ifp->if_output;
+	ifp->if_output = lagg_port_output;
+
+	lp->lp_ifp = ifp;
+	lp->lp_softc = sc;
+
+	/* Save port link layer address */
+	bcopy(IF_LLADDR(ifp), lp->lp_lladdr, ETHER_ADDR_LEN);
+
+	if (SLIST_EMPTY(&sc->sc_ports)) {
+		sc->sc_primary = lp;
+		lagg_lladdr(sc, IF_LLADDR(ifp));
+	} else {
+		/* Update link layer address for this port */
+		lagg_port_lladdr(lp, IF_LLADDR(sc->sc_ifp));
+	}
+
+	/* Insert into the list of ports */
+	SLIST_INSERT_HEAD(&sc->sc_ports, lp, lp_entries);
+	sc->sc_count++;
+
+	/* Update lagg capabilities */
+	lagg_capabilities(sc);
+	lagg_linkstate(sc);
+
+	/* Add multicast addresses and interface flags to this port */
+	lagg_ether_cmdmulti(lp, 1);
+	lagg_setflags(lp, 1);
+
+	if (sc->sc_port_create != NULL)
+		error = (*sc->sc_port_create)(lp);
+	if (error) {
+		/* remove the port again, without calling sc_port_destroy */
+		lagg_port_destroy(lp, 0);
+		return (error);
+	}
+
+	return (error);
+}
+
+static int
+lagg_port_checkstacking(struct lagg_softc *sc)
+{
+	struct lagg_softc *sc_ptr;
+	struct lagg_port *lp;
+	int m = 0;
+
+	LAGG_WLOCK_ASSERT(sc);
+
+	SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
+		if (lp->lp_flags & LAGG_PORT_STACK) {
+			sc_ptr = (struct lagg_softc *)lp->lp_ifp->if_softc;
+			m = MAX(m, lagg_port_checkstacking(sc_ptr));
+		}
+	}
+
+	return (m + 1);
+}
+
+static int
+lagg_port_destroy(struct lagg_port *lp, int runpd)
+{
+	struct lagg_softc *sc = lp->lp_softc;
+	struct lagg_port *lp_ptr;
+	struct lagg_llq *llq;
+	struct ifnet *ifp = lp->lp_ifp;
+
+	LAGG_WLOCK_ASSERT(sc);
+
+	if (runpd && sc->sc_port_destroy != NULL)
+		(*sc->sc_port_destroy)(lp);
+
+	/*
+	 * Remove multicast addresses and interface flags from this port and
+	 * reset the MAC address, skip if the interface is being detached.
+	 */
+	if (!lp->lp_detaching) {
+		lagg_ether_cmdmulti(lp, 0);
+		lagg_setflags(lp, 0);
+		lagg_port_lladdr(lp, lp->lp_lladdr);
+	}
+
+	/* Restore interface */
+	ifp->if_type = lp->lp_iftype;
+	ifp->if_ioctl = lp->lp_ioctl;
+	ifp->if_output = lp->lp_output;
+	ifp->if_lagg = NULL;
+
+	/* Finally, remove the port from the lagg */
+	SLIST_REMOVE(&sc->sc_ports, lp, lagg_port, lp_entries);
+	sc->sc_count--;
+
+	/* Update the primary interface */
+	if (lp == sc->sc_primary) {
+		uint8_t lladdr[ETHER_ADDR_LEN];
+
+		if ((lp_ptr = SLIST_FIRST(&sc->sc_ports)) == NULL) {
+			bzero(&lladdr, ETHER_ADDR_LEN);
+		} else {
+			bcopy(lp_ptr->lp_lladdr,
+			    lladdr, ETHER_ADDR_LEN);
+		}
+		lagg_lladdr(sc, lladdr);
+		sc->sc_primary = lp_ptr;
+
+		/* Update link layer address for each port */
+		SLIST_FOREACH(lp_ptr, &sc->sc_ports, lp_entries)
+			lagg_port_lladdr(lp_ptr, lladdr);
+	}
+
+	/* Remove any pending lladdr changes from the queue */
+	if (lp->lp_detaching) {
+		SLIST_FOREACH(llq, &sc->sc_llq_head, llq_entries) {
+			if (llq->llq_ifp == ifp) {
+				SLIST_REMOVE(&sc->sc_llq_head, llq, lagg_llq,
+				    llq_entries);
+				free(llq, M_DEVBUF);
+				break;	/* Only appears once */
+			}
+		}
+	}
+
+	if (lp->lp_ifflags)
+		if_printf(ifp, "%s: lp_ifflags unclean\n", __func__);
+
+	free(lp, M_DEVBUF);
+
+	/* Update lagg capabilities */
+	lagg_capabilities(sc);
+	lagg_linkstate(sc);
+
+	return (0);
+}
+
+static int
+lagg_port_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
+{
+	struct lagg_reqport *rp = (struct lagg_reqport *)data;
+	struct lagg_softc *sc;
+	struct lagg_port *lp = NULL;
+	int error = 0;
+
+	/* Should be checked by the caller */
+	if (ifp->if_type != IFT_IEEE8023ADLAG ||
+	    (lp = ifp->if_lagg) == NULL || (sc = lp->lp_softc) == NULL)
+		goto fallback;
+
+	switch (cmd) {
+	case SIOCGLAGGPORT:
+		if (rp->rp_portname[0] == '\0' ||
+		    ifunit(rp->rp_portname) != ifp) {
+			error = EINVAL;
+			break;
+		}
+
+		LAGG_RLOCK(sc);
+		if ((lp = ifp->if_lagg) == NULL || lp->lp_softc != sc) {
+			error = ENOENT;
+			LAGG_RUNLOCK(sc);
+			break;
+		}
+
+		lagg_port2req(lp, rp);
+		LAGG_RUNLOCK(sc);
+		break;
+
+	case SIOCSIFCAP:
+		if (lp->lp_ioctl == NULL) {
+			error = EINVAL;
+			break;
+		}
+		error = (*lp->lp_ioctl)(ifp, cmd, data);
+		if (error)
+			break;
+
+		/* Update lagg interface capabilities */
+		LAGG_WLOCK(sc);
+		lagg_capabilities(sc);
+		LAGG_WUNLOCK(sc);
+		break;
+
+	case SIOCSIFMTU:
+		/* Do not allow the MTU to be changed once joined */
+		error = EINVAL;
+		break;
+
+	default:
+		goto fallback;
+	}
+
+	return (error);
+
+fallback:
+	if (lp->lp_ioctl != NULL)
+		return ((*lp->lp_ioctl)(ifp, cmd, data));
+
+	return (EINVAL);
+}
+
+static int
+lagg_port_output(struct ifnet *ifp, struct mbuf *m,
+	struct sockaddr *dst, struct route *ro)
+{
+	struct lagg_port *lp = ifp->if_lagg;
+	struct ether_header *eh;
+	short type = 0;
+
+	switch (dst->sa_family) {
+		case pseudo_AF_HDRCMPLT:
+		case AF_UNSPEC:
+			eh = (struct ether_header *)dst->sa_data;
+			type = eh->ether_type;
+			break;
+	}
+
+	/*
+	 * Only allow ethernet types required to initiate or maintain the link,
+	 * aggregated frames take a different path.
+	 */
+	switch (ntohs(type)) {
+		case ETHERTYPE_PAE:	/* EAPOL PAE/802.1x */
+			return ((*lp->lp_output)(ifp, m, dst, ro));
+	}
+
+	/* drop any other frames */
+	m_freem(m);
+	return (EBUSY);
+}
+
+static void
+lagg_port_ifdetach(void *arg __unused, struct ifnet *ifp)
+{
+	struct lagg_port *lp;
+	struct lagg_softc *sc;
+
+	if ((lp = ifp->if_lagg) == NULL)
+		return;
+
+	sc = lp->lp_softc;
+
+	LAGG_WLOCK(sc);
+	lp->lp_detaching = 1;
+	lagg_port_destroy(lp, 1);
+	LAGG_WUNLOCK(sc);
+}
+
+static void
+lagg_port2req(struct lagg_port *lp, struct lagg_reqport *rp)
+{
+	struct lagg_softc *sc = lp->lp_softc;
+
+	strlcpy(rp->rp_ifname, sc->sc_ifname, sizeof(rp->rp_ifname));
+	strlcpy(rp->rp_portname, lp->lp_ifp->if_xname, sizeof(rp->rp_portname));
+	rp->rp_prio = lp->lp_prio;
+	rp->rp_flags = lp->lp_flags;
+	if (sc->sc_portreq != NULL)
+		(*sc->sc_portreq)(lp, (caddr_t)&rp->rp_psc);
+
+	/* Add protocol specific flags */
+	switch (sc->sc_proto) {
+		case LAGG_PROTO_FAILOVER:
+			if (lp == sc->sc_primary)
+				rp->rp_flags |= LAGG_PORT_MASTER;
+			if (lp == lagg_link_active(sc, sc->sc_primary))
+				rp->rp_flags |= LAGG_PORT_ACTIVE;
+			break;
+
+		case LAGG_PROTO_ROUNDROBIN:
+		case LAGG_PROTO_LOADBALANCE:
+		case LAGG_PROTO_ETHERCHANNEL:
+			if (LAGG_PORTACTIVE(lp))
+				rp->rp_flags |= LAGG_PORT_ACTIVE;
+			break;
+
+		case LAGG_PROTO_LACP:
+			/* LACP has a different definition of active */
+			if (lacp_isactive(lp))
+				rp->rp_flags |= LAGG_PORT_ACTIVE;
+			if (lacp_iscollecting(lp))
+				rp->rp_flags |= LAGG_PORT_COLLECTING;
+			if (lacp_isdistributing(lp))
+				rp->rp_flags |= LAGG_PORT_DISTRIBUTING;
+			break;
+	}
+
+}
+
+static void
+lagg_init(void *xsc)
+{
+	struct lagg_softc *sc = (struct lagg_softc *)xsc;
+	struct lagg_port *lp;
+	struct ifnet *ifp = sc->sc_ifp;
+
+	if (ifp->if_drv_flags & IFF_DRV_RUNNING)
+		return;
+
+	LAGG_WLOCK(sc);
+
+	ifp->if_drv_flags |= IFF_DRV_RUNNING;
+	/* Update the port lladdrs */
+	SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
+		lagg_port_lladdr(lp, IF_LLADDR(ifp));
+
+	if (sc->sc_init != NULL)
+		(*sc->sc_init)(sc);
+
+	LAGG_WUNLOCK(sc);
+}
+
+static void
+lagg_stop(struct lagg_softc *sc)
+{
+	struct ifnet *ifp = sc->sc_ifp;
+
+	LAGG_WLOCK_ASSERT(sc);
+
+	if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
+		return;
+
+	ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
+
+	if (sc->sc_stop != NULL)
+		(*sc->sc_stop)(sc);
+}
+
+static int
+lagg_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
+{
+	struct lagg_softc *sc = (struct lagg_softc *)ifp->if_softc;
+	struct lagg_reqall *ra = (struct lagg_reqall *)data;
+	struct lagg_reqport *rp = (struct lagg_reqport *)data, rpbuf;
+	struct ifreq *ifr = (struct ifreq *)data;
+	struct lagg_port *lp;
+	struct ifnet *tpif;
+	struct thread *td = curthread;
+	char *buf, *outbuf;
+	int count, buflen, len, error = 0;
+
+	bzero(&rpbuf, sizeof(rpbuf));
+
+	switch (cmd) {
+	case SIOCGLAGG:
+		LAGG_RLOCK(sc);
+		count = 0;
+		SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
+			count++;
+		buflen = count * sizeof(struct lagg_reqport);
+		LAGG_RUNLOCK(sc);
+
+		outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
+
+		LAGG_RLOCK(sc);
+		ra->ra_proto = sc->sc_proto;
+		if (sc->sc_req != NULL)
+			(*sc->sc_req)(sc, (caddr_t)&ra->ra_psc);
+
+		count = 0;
+		buf = outbuf;
+		len = min(ra->ra_size, buflen);
+		SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
+			if (len < sizeof(rpbuf))
+				break;
+
+			lagg_port2req(lp, &rpbuf);
+			memcpy(buf, &rpbuf, sizeof(rpbuf));
+			count++;
+			buf += sizeof(rpbuf);
+			len -= sizeof(rpbuf);
+		}
+		LAGG_RUNLOCK(sc);
+		ra->ra_ports = count;
+		ra->ra_size = count * sizeof(rpbuf);
+		error = copyout(outbuf, ra->ra_port, ra->ra_size);
+		free(outbuf, M_TEMP);
+		break;
+	case SIOCSLAGG:
+		error = priv_check(td, PRIV_NET_LAGG);
+		if (error)
+			break;
+		if (ra->ra_proto >= LAGG_PROTO_MAX) {
+			error = EPROTONOSUPPORT;
+			break;
+		}
+		if (sc->sc_proto != LAGG_PROTO_NONE) {
+			LAGG_WLOCK(sc);
+			error = sc->sc_detach(sc);
+			/* Reset protocol and pointers */
+			sc->sc_proto = LAGG_PROTO_NONE;
+			sc->sc_detach = NULL;
+			sc->sc_start = NULL;
+			sc->sc_input = NULL;
+			sc->sc_port_create = NULL;
+			sc->sc_port_destroy = NULL;
+			sc->sc_linkstate = NULL;
+			sc->sc_init = NULL;
+			sc->sc_stop = NULL;
+			sc->sc_lladdr = NULL;
+			sc->sc_req = NULL;
+			sc->sc_portreq = NULL;
+			LAGG_WUNLOCK(sc);
+		}
+		if (error != 0)
+			break;
+		for (int i = 0; i < (sizeof(lagg_protos) /
+		    sizeof(lagg_protos[0])); i++) {
+			if (lagg_protos[i].ti_proto == ra->ra_proto) {
+				if (sc->sc_ifflags & IFF_DEBUG)
+					printf("%s: using proto %u\n",
+					    sc->sc_ifname,
+					    lagg_protos[i].ti_proto);
+				LAGG_WLOCK(sc);
+				sc->sc_proto = lagg_protos[i].ti_proto;
+				if (sc->sc_proto != LAGG_PROTO_NONE)
+					error = lagg_protos[i].ti_attach(sc);
+				LAGG_WUNLOCK(sc);
+				return (error);
+			}
+		}
+		error = EPROTONOSUPPORT;
+		break;
+	case SIOCGLAGGPORT:
+		if (rp->rp_portname[0] == '\0' ||
+		    (tpif = ifunit(rp->rp_portname)) == NULL) {
+			error = EINVAL;
+			break;
+		}
+
+		LAGG_RLOCK(sc);
+		if ((lp = (struct lagg_port *)tpif->if_lagg) == NULL ||
+		    lp->lp_softc != sc) {
+			error = ENOENT;
+			LAGG_RUNLOCK(sc);
+			break;
+		}
+
+		lagg_port2req(lp, rp);
+		LAGG_RUNLOCK(sc);
+		break;
+	case SIOCSLAGGPORT:
+		error = priv_check(td, PRIV_NET_LAGG);
+		if (error)
+			break;
+		if (rp->rp_portname[0] == '\0' ||
+		    (tpif = ifunit(rp->rp_portname)) == NULL) {
+			error = EINVAL;
+			break;
+		}
+		LAGG_WLOCK(sc);
+		error = lagg_port_create(sc, tpif);
+		LAGG_WUNLOCK(sc);
+		break;
+	case SIOCSLAGGDELPORT:
+		error = priv_check(td, PRIV_NET_LAGG);
+		if (error)
+			break;
+		if (rp->rp_portname[0] == '\0' ||
+		    (tpif = ifunit(rp->rp_portname)) == NULL) {
+			error = EINVAL;
+			break;
+		}
+
+		LAGG_WLOCK(sc);
+		if ((lp = (struct lagg_port *)tpif->if_lagg) == NULL ||
+		    lp->lp_softc != sc) {
+			error = ENOENT;
+			LAGG_WUNLOCK(sc);
+			break;
+		}
+
+		error = lagg_port_destroy(lp, 1);
+		LAGG_WUNLOCK(sc);
+		break;
+	case SIOCSIFFLAGS:
+		/* Set flags on ports too */
+		LAGG_WLOCK(sc);
+		SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
+			lagg_setflags(lp, 1);
+		}
+		LAGG_WUNLOCK(sc);
+
+		if (!(ifp->if_flags & IFF_UP) &&
+		    (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
+			/*
+			 * If interface is marked down and it is running,
+			 * then stop and disable it.
+			 */
+			LAGG_WLOCK(sc);
+			lagg_stop(sc);
+			LAGG_WUNLOCK(sc);
+		} else if ((ifp->if_flags & IFF_UP) &&
+		    !(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
+			/*
+			 * If interface is marked up and it is stopped, then
+			 * start it.
+			 */
+			(*ifp->if_init)(sc);
+		}
+		break;
+	case SIOCADDMULTI:
+	case SIOCDELMULTI:
+		LAGG_WLOCK(sc);
+		error = lagg_ether_setmulti(sc);
+		LAGG_WUNLOCK(sc);
+		break;
+	case SIOCSIFMEDIA:
+	case SIOCGIFMEDIA:
+		error = ifmedia_ioctl(ifp, ifr, &sc->sc_media, cmd);
+		break;
+
+	case SIOCSIFCAP:
+	case SIOCSIFMTU:
+		/* Do not allow the MTU or caps to be directly changed */
+		error = EINVAL;
+		break;
+
+	default:
+		error = ether_ioctl(ifp, cmd, data);
+		break;
+	}
+	return (error);
+}
+
+static int
+lagg_ether_setmulti(struct lagg_softc *sc)
+{
+	struct lagg_port *lp;
+
+	LAGG_WLOCK_ASSERT(sc);
+
+	SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
+		/* First, remove any existing filter entries. */
+		lagg_ether_cmdmulti(lp, 0);
+		/* copy all addresses from the lagg interface to the port */
+		lagg_ether_cmdmulti(lp, 1);
+	}
+	return (0);
+}
+
+static int
+lagg_ether_cmdmulti(struct lagg_port *lp, int set)
+{
+	struct lagg_softc *sc = lp->lp_softc;
+	struct ifnet *ifp = lp->lp_ifp;
+	struct ifnet *scifp = sc->sc_ifp;
+	struct lagg_mc *mc;
+	struct ifmultiaddr *ifma, *rifma = NULL;
+	struct sockaddr_dl sdl;
+	int error;
+
+	LAGG_WLOCK_ASSERT(sc);
+
+	bzero((char *)&sdl, sizeof(sdl));
+	sdl.sdl_len = sizeof(sdl);
+	sdl.sdl_family = AF_LINK;
+	sdl.sdl_type = IFT_ETHER;
+	sdl.sdl_alen = ETHER_ADDR_LEN;
+	sdl.sdl_index = ifp->if_index;
+
+	if (set) {
+		TAILQ_FOREACH(ifma, &scifp->if_multiaddrs, ifma_link) {
+			if (ifma->ifma_addr->sa_family != AF_LINK)
+				continue;
+			bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr),
+			    LLADDR(&sdl), ETHER_ADDR_LEN);
+
+			error = if_addmulti(ifp, (struct sockaddr *)&sdl, &rifma);
+			if (error)
+				return (error);
+			mc = malloc(sizeof(struct lagg_mc), M_DEVBUF, M_NOWAIT);
+			if (mc == NULL)
+				return (ENOMEM);
+			mc->mc_ifma = rifma;
+			SLIST_INSERT_HEAD(&lp->lp_mc_head, mc, mc_entries);
+		}
+	} else {
+		while ((mc = SLIST_FIRST(&lp->lp_mc_head)) != NULL) {
+			SLIST_REMOVE(&lp->lp_mc_head, mc, lagg_mc, mc_entries);
+			if_delmulti_ifma(mc->mc_ifma);
+			free(mc, M_DEVBUF);
+		}
+	}
+	return (0);
+}
+
+/* Handle a ref counted flag that should be set on the lagg port as well */
+static int
+lagg_setflag(struct lagg_port *lp, int flag, int status,
+	     int (*func)(struct ifnet *, int))
+{
+	struct lagg_softc *sc = lp->lp_softc;
+	struct ifnet *scifp = sc->sc_ifp;
+	struct ifnet *ifp = lp->lp_ifp;
+	int error;
+
+	LAGG_WLOCK_ASSERT(sc);
+
+	status = status ? (scifp->if_flags & flag) : 0;
+	/* Now "status" contains the flag value or 0 */
+
+	/*
+	 * See if recorded ports status is different from what
+	 * we want it to be.  If it is, flip it.  We record ports
+	 * status in lp_ifflags so that we won't clear ports flag
+	 * we haven't set.  In fact, we don't clear or set ports
+	 * flags directly, but get or release references to them.
+	 * That's why we can be sure that recorded flags still are
+	 * in accord with actual ports flags.
+	 */
+	if (status != (lp->lp_ifflags & flag)) {
+		error = (*func)(ifp, status);
+		if (error)
+			return (error);
+		lp->lp_ifflags &= ~flag;
+		lp->lp_ifflags |= status;
+	}
+	return (0);
+}
+
+/*
+ * Handle IFF_* flags that require certain changes on the lagg port
+ * if "status" is true, update ports flags respective to the lagg
+ * if "status" is false, forcedly clear the flags set on port.
+ */
+static int
+lagg_setflags(struct lagg_port *lp, int status)
+{
+	int error, i;
+
+	for (i = 0; lagg_pflags[i].flag; i++) {
+		error = lagg_setflag(lp, lagg_pflags[i].flag,
+		    status, lagg_pflags[i].func);
+		if (error)
+			return (error);
+	}
+	return (0);
+}
+
+static void
+lagg_start(struct ifnet *ifp)
+{
+	struct lagg_softc *sc = (struct lagg_softc *)ifp->if_softc;
+	struct mbuf *m;
+	int error = 0;
+
+	LAGG_RLOCK(sc);
+	/* We need a Tx algorithm and at least one port */
+	if (sc->sc_proto == LAGG_PROTO_NONE || sc->sc_count == 0) {
+		IF_DRAIN(&ifp->if_snd);
+		LAGG_RUNLOCK(sc);
+		return;
+	}
+
+	for (;; error = 0) {
+		IFQ_DEQUEUE(&ifp->if_snd, m);
+		if (m == NULL)
+			break;
+
+		ETHER_BPF_MTAP(ifp, m);
+
+		error = (*sc->sc_start)(sc, m);
+		if (error == 0)
+			ifp->if_opackets++;
+		else
+			ifp->if_oerrors++;
+	}
+	LAGG_RUNLOCK(sc);
+}
+
+static struct mbuf *
+lagg_input(struct ifnet *ifp, struct mbuf *m)
+{
+	struct lagg_port *lp = ifp->if_lagg;
+	struct lagg_softc *sc = lp->lp_softc;
+	struct ifnet *scifp = sc->sc_ifp;
+
+	if ((scifp->if_drv_flags & IFF_DRV_RUNNING) == 0 ||
+	    (lp->lp_flags & LAGG_PORT_DISABLED) ||
+	    sc->sc_proto == LAGG_PROTO_NONE) {
+		m_freem(m);
+		return (NULL);
+	}
+
+	LAGG_RLOCK(sc);
+	ETHER_BPF_MTAP(scifp, m);
+
+	m = (*sc->sc_input)(sc, lp, m);
+
+	if (m != NULL) {
+		scifp->if_ipackets++;
+		scifp->if_ibytes += m->m_pkthdr.len;
+
+		if (scifp->if_flags & IFF_MONITOR) {
+			m_freem(m);
+			m = NULL;
+		}
+	}
+
+	LAGG_RUNLOCK(sc);
+	return (m);
+}
+
+static int
+lagg_media_change(struct ifnet *ifp)
+{
+	struct lagg_softc *sc = (struct lagg_softc *)ifp->if_softc;
+
+	if (sc->sc_ifflags & IFF_DEBUG)
+		printf("%s\n", __func__);
+
+	/* Ignore */
+	return (0);
+}
+
+static void
+lagg_media_status(struct ifnet *ifp, struct ifmediareq *imr)
+{
+	struct lagg_softc *sc = (struct lagg_softc *)ifp->if_softc;
+	struct lagg_port *lp;
+
+	imr->ifm_status = IFM_AVALID;
+	imr->ifm_active = IFM_ETHER | IFM_AUTO;
+
+	LAGG_RLOCK(sc);
+	SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
+		if (LAGG_PORTACTIVE(lp))
+			imr->ifm_status |= IFM_ACTIVE;
+	}
+	LAGG_RUNLOCK(sc);
+}
+
+static void
+lagg_linkstate(struct lagg_softc *sc)
+{
+	struct lagg_port *lp;
+	int new_link = LINK_STATE_DOWN;
+	uint64_t speed;
+
+	/* Our link is considered up if at least one of our ports is active */
+	SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
+		if (lp->lp_link_state == LINK_STATE_UP) {
+			new_link = LINK_STATE_UP;
+			break;
+		}
+	}
+	if_link_state_change(sc->sc_ifp, new_link);
+
+	/* Update if_baudrate to reflect the max possible speed */
+	switch (sc->sc_proto) {
+		case LAGG_PROTO_FAILOVER:
+			sc->sc_ifp->if_baudrate = sc->sc_primary != NULL ?
+			    sc->sc_primary->lp_ifp->if_baudrate : 0;
+			break;
+		case LAGG_PROTO_ROUNDROBIN:
+		case LAGG_PROTO_LOADBALANCE:
+		case LAGG_PROTO_ETHERCHANNEL:
+			speed = 0;
+			SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
+				speed += lp->lp_ifp->if_baudrate;
+			sc->sc_ifp->if_baudrate = speed;
+			break;
+		case LAGG_PROTO_LACP:
+			/* LACP updates if_baudrate itself */
+			break;
+	}
+}
+
+static void
+lagg_port_state(struct ifnet *ifp, int state)
+{
+	struct lagg_port *lp = (struct lagg_port *)ifp->if_lagg;
+	struct lagg_softc *sc = NULL;
+
+	if (lp != NULL)
+		sc = lp->lp_softc;
+	if (sc == NULL)
+		return;
+
+	LAGG_WLOCK(sc);
+	lagg_linkstate(sc);
+	if (sc->sc_linkstate != NULL)
+		(*sc->sc_linkstate)(lp);
+	LAGG_WUNLOCK(sc);
+}
+
+struct lagg_port *
+lagg_link_active(struct lagg_softc *sc, struct lagg_port *lp)
+{
+	struct lagg_port *lp_next, *rval = NULL;
+	// int new_link = LINK_STATE_DOWN;
+
+	LAGG_RLOCK_ASSERT(sc);
+	/*
+	 * Search a port which reports an active link state.
+	 */
+
+	if (lp == NULL)
+		goto search;
+	if (LAGG_PORTACTIVE(lp)) {
+		rval = lp;
+		goto found;
+	}
+	if ((lp_next = SLIST_NEXT(lp, lp_entries)) != NULL &&
+	    LAGG_PORTACTIVE(lp_next)) {
+		rval = lp_next;
+		goto found;
+	}
+
+search:
+	SLIST_FOREACH(lp_next, &sc->sc_ports, lp_entries) {
+		if (LAGG_PORTACTIVE(lp_next)) {
+			rval = lp_next;
+			goto found;
+		}
+	}
+
+found:
+	if (rval != NULL) {
+		/*
+		 * The IEEE 802.1D standard assumes that a lagg with
+		 * multiple ports is always full duplex. This is valid
+		 * for load sharing laggs and if at least two links
+		 * are active. Unfortunately, checking the latter would
+		 * be too expensive at this point.
+		 XXX
+		if ((sc->sc_capabilities & IFCAP_LAGG_FULLDUPLEX) &&
+		    (sc->sc_count > 1))
+			new_link = LINK_STATE_FULL_DUPLEX;
+		else
+			new_link = rval->lp_link_state;
+		 */
+	}
+
+	return (rval);
+}
+
+static const void *
+lagg_gethdr(struct mbuf *m, u_int off, u_int len, void *buf)
+{
+	if (m->m_pkthdr.len < (off + len)) {
+		return (NULL);
+	} else if (m->m_len < (off + len)) {
+		m_copydata(m, off, len, buf);
+		return (buf);
+	}
+	return (mtod(m, char *) + off);
+}
+
+uint32_t
+lagg_hashmbuf(struct mbuf *m, uint32_t key)
+{
+	uint16_t etype;
+	uint32_t p = 0;
+	int off;
+	struct ether_header *eh;
+	struct ether_vlan_header vlanbuf;
+	const struct ether_vlan_header *vlan;
+#ifdef INET
+	const struct ip *ip;
+	struct ip ipbuf;
+#endif
+#ifdef INET6
+	const struct ip6_hdr *ip6;
+	struct ip6_hdr ip6buf;
+	uint32_t flow;
+#endif
+
+	off = sizeof(*eh);
+	if (m->m_len < off)
+		goto out;
+	eh = mtod(m, struct ether_header *);
+	etype = ntohs(eh->ether_type);
+	p = hash32_buf(&eh->ether_shost, ETHER_ADDR_LEN, key);
+	p = hash32_buf(&eh->ether_dhost, ETHER_ADDR_LEN, p);
+
+	/* Special handling for encapsulating VLAN frames */
+	if (m->m_flags & M_VLANTAG) {
+		p = hash32_buf(&m->m_pkthdr.ether_vtag,
+		    sizeof(m->m_pkthdr.ether_vtag), p);
+	} else if (etype == ETHERTYPE_VLAN) {
+		vlan = lagg_gethdr(m, off,  sizeof(*vlan), &vlanbuf);
+		if (vlan == NULL)
+			goto out;
+
+		p = hash32_buf(&vlan->evl_tag, sizeof(vlan->evl_tag), p);
+		etype = ntohs(vlan->evl_proto);
+		off += sizeof(*vlan) - sizeof(*eh);
+	}
+
+	switch (etype) {
+#ifdef INET
+	case ETHERTYPE_IP:
+		ip = lagg_gethdr(m, off, sizeof(*ip), &ipbuf);
+		if (ip == NULL)
+			goto out;
+
+		p = hash32_buf(&ip->ip_src, sizeof(struct in_addr), p);
+		p = hash32_buf(&ip->ip_dst, sizeof(struct in_addr), p);
+		break;
+#endif
+#ifdef INET6
+	case ETHERTYPE_IPV6:
+		ip6 = lagg_gethdr(m, off, sizeof(*ip6), &ip6buf);
+		if (ip6 == NULL)
+			goto out;
+
+		p = hash32_buf(&ip6->ip6_src, sizeof(struct in6_addr), p);
+		p = hash32_buf(&ip6->ip6_dst, sizeof(struct in6_addr), p);
+		flow = ip6->ip6_flow & IPV6_FLOWLABEL_MASK;
+		p = hash32_buf(&flow, sizeof(flow), p);	/* IPv6 flow label */
+		break;
+#endif
+	}
+out:
+	return (p);
+}
+
+int
+lagg_enqueue(struct ifnet *ifp, struct mbuf *m)
+{
+
+	return (ifp->if_transmit)(ifp, m);
+}
+
+/*
+ * Simple round robin aggregation
+ */
+
+static int
+lagg_rr_attach(struct lagg_softc *sc)
+{
+	sc->sc_detach = lagg_rr_detach;
+	sc->sc_start = lagg_rr_start;
+	sc->sc_input = lagg_rr_input;
+	sc->sc_port_create = NULL;
+	sc->sc_capabilities = IFCAP_LAGG_FULLDUPLEX;
+	sc->sc_seq = 0;
+
+	return (0);
+}
+
+static int
+lagg_rr_detach(struct lagg_softc *sc)
+{
+	return (0);
+}
+
+static int
+lagg_rr_start(struct lagg_softc *sc, struct mbuf *m)
+{
+	struct lagg_port *lp;
+	uint32_t p;
+
+	p = atomic_fetchadd_32(&sc->sc_seq, 1);
+	p %= sc->sc_count;
+	lp = SLIST_FIRST(&sc->sc_ports);
+	while (p--)
+		lp = SLIST_NEXT(lp, lp_entries);
+
+	/*
+	 * Check the port's link state. This will return the next active
+	 * port if the link is down or the port is NULL.
+	 */
+	if ((lp = lagg_link_active(sc, lp)) == NULL) {
+		m_freem(m);
+		return (ENOENT);
+	}
+
+	/* Send mbuf */
+	return (lagg_enqueue(lp->lp_ifp, m));
+}
+
+static struct mbuf *
+lagg_rr_input(struct lagg_softc *sc, struct lagg_port *lp, struct mbuf *m)
+{
+	struct ifnet *ifp = sc->sc_ifp;
+
+	/* Just pass in the packet to our lagg device */
+	m->m_pkthdr.rcvif = ifp;
+
+	return (m);
+}
+
+/*
+ * Active failover
+ */
+
+static int
+lagg_fail_attach(struct lagg_softc *sc)
+{
+	sc->sc_detach = lagg_fail_detach;
+	sc->sc_start = lagg_fail_start;
+	sc->sc_input = lagg_fail_input;
+	sc->sc_port_create = NULL;
+	sc->sc_port_destroy = NULL;
+
+	return (0);
+}
+
+static int
+lagg_fail_detach(struct lagg_softc *sc)
+{
+	return (0);
+}
+
+static int
+lagg_fail_start(struct lagg_softc *sc, struct mbuf *m)
+{
+	struct lagg_port *lp;
+
+	/* Use the master port if active or the next available port */
+	if ((lp = lagg_link_active(sc, sc->sc_primary)) == NULL) {
+		m_freem(m);
+		return (ENOENT);
+	}
+
+	/* Send mbuf */
+	return (lagg_enqueue(lp->lp_ifp, m));
+}
+
+static struct mbuf *
+lagg_fail_input(struct lagg_softc *sc, struct lagg_port *lp, struct mbuf *m)
+{
+	struct ifnet *ifp = sc->sc_ifp;
+	struct lagg_port *tmp_tp;
+
+	if (lp == sc->sc_primary || lagg_failover_rx_all) {
+		m->m_pkthdr.rcvif = ifp;
+		return (m);
+	}
+
+	if (!LAGG_PORTACTIVE(sc->sc_primary)) {
+		tmp_tp = lagg_link_active(sc, sc->sc_primary);
+		/*
+		 * If tmp_tp is null, we've recieved a packet when all
+		 * our links are down. Weird, but process it anyways.
+		 */
+		if ((tmp_tp == NULL || tmp_tp == lp)) {
+			m->m_pkthdr.rcvif = ifp;
+			return (m);
+		}
+	}
+
+	m_freem(m);
+	return (NULL);
+}
+
+/*
+ * Loadbalancing
+ */
+
+static int
+lagg_lb_attach(struct lagg_softc *sc)
+{
+	struct lagg_port *lp;
+	struct lagg_lb *lb;
+
+	if ((lb = (struct lagg_lb *)malloc(sizeof(struct lagg_lb),
+	    M_DEVBUF, M_NOWAIT|M_ZERO)) == NULL)
+		return (ENOMEM);
+
+	sc->sc_detach = lagg_lb_detach;
+	sc->sc_start = lagg_lb_start;
+	sc->sc_input = lagg_lb_input;
+	sc->sc_port_create = lagg_lb_port_create;
+	sc->sc_port_destroy = lagg_lb_port_destroy;
+	sc->sc_capabilities = IFCAP_LAGG_FULLDUPLEX;
+
+	lb->lb_key = arc4random();
+	sc->sc_psc = (caddr_t)lb;
+
+	SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
+		lagg_lb_port_create(lp);
+
+	return (0);
+}
+
+static int
+lagg_lb_detach(struct lagg_softc *sc)
+{
+	struct lagg_lb *lb = (struct lagg_lb *)sc->sc_psc;
+	if (lb != NULL)
+		free(lb, M_DEVBUF);
+	return (0);
+}
+
+static int
+lagg_lb_porttable(struct lagg_softc *sc, struct lagg_port *lp)
+{
+	struct lagg_lb *lb = (struct lagg_lb *)sc->sc_psc;
+	struct lagg_port *lp_next;
+	int i = 0;
+
+	bzero(&lb->lb_ports, sizeof(lb->lb_ports));
+	SLIST_FOREACH(lp_next, &sc->sc_ports, lp_entries) {
+		if (lp_next == lp)
+			continue;
+		if (i >= LAGG_MAX_PORTS)
+			return (EINVAL);
+		if (sc->sc_ifflags & IFF_DEBUG)
+			printf("%s: port %s at index %d\n",
+			    sc->sc_ifname, lp_next->lp_ifname, i);
+		lb->lb_ports[i++] = lp_next;
+	}
+
+	return (0);
+}
+
+static int
+lagg_lb_port_create(struct lagg_port *lp)
+{
+	struct lagg_softc *sc = lp->lp_softc;
+	return (lagg_lb_porttable(sc, NULL));
+}
+
+static void
+lagg_lb_port_destroy(struct lagg_port *lp)
+{
+	struct lagg_softc *sc = lp->lp_softc;
+	lagg_lb_porttable(sc, lp);
+}
+
+static int
+lagg_lb_start(struct lagg_softc *sc, struct mbuf *m)
+{
+	struct lagg_lb *lb = (struct lagg_lb *)sc->sc_psc;
+	struct lagg_port *lp = NULL;
+	uint32_t p = 0;
+
+	if (m->m_flags & M_FLOWID)
+		p = m->m_pkthdr.flowid;
+	else
+		p = lagg_hashmbuf(m, lb->lb_key);
+	p %= sc->sc_count;
+	lp = lb->lb_ports[p];
+
+	/*
+	 * Check the port's link state. This will return the next active
+	 * port if the link is down or the port is NULL.
+	 */
+	if ((lp = lagg_link_active(sc, lp)) == NULL) {
+		m_freem(m);
+		return (ENOENT);
+	}
+
+	/* Send mbuf */
+	return (lagg_enqueue(lp->lp_ifp, m));
+}
+
+static struct mbuf *
+lagg_lb_input(struct lagg_softc *sc, struct lagg_port *lp, struct mbuf *m)
+{
+	struct ifnet *ifp = sc->sc_ifp;
+
+	/* Just pass in the packet to our lagg device */
+	m->m_pkthdr.rcvif = ifp;
+
+	return (m);
+}
+
+/*
+ * 802.3ad LACP
+ */
+
+static int
+lagg_lacp_attach(struct lagg_softc *sc)
+{
+	struct lagg_port *lp;
+	int error;
+
+	sc->sc_detach = lagg_lacp_detach;
+	sc->sc_port_create = lacp_port_create;
+	sc->sc_port_destroy = lacp_port_destroy;
+	sc->sc_linkstate = lacp_linkstate;
+	sc->sc_start = lagg_lacp_start;
+	sc->sc_input = lagg_lacp_input;
+	sc->sc_init = lacp_init;
+	sc->sc_stop = lacp_stop;
+	sc->sc_lladdr = lagg_lacp_lladdr;
+	sc->sc_req = lacp_req;
+	sc->sc_portreq = lacp_portreq;
+
+	error = lacp_attach(sc);
+	if (error)
+		return (error);
+
+	SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
+		lacp_port_create(lp);
+
+	return (error);
+}
+
+static int
+lagg_lacp_detach(struct lagg_softc *sc)
+{
+	struct lagg_port *lp;
+	int error;
+
+	SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
+		lacp_port_destroy(lp);
+
+	/* unlocking is safe here */
+	LAGG_WUNLOCK(sc);
+	error = lacp_detach(sc);
+	LAGG_WLOCK(sc);
+
+	return (error);
+}
+
+static void
+lagg_lacp_lladdr(struct lagg_softc *sc)
+{
+	struct lagg_port *lp;
+
+	/* purge all the lacp ports */
+	SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
+		lacp_port_destroy(lp);
+
+	/* add them back in */
+	SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
+		lacp_port_create(lp);
+}
+
+static int
+lagg_lacp_start(struct lagg_softc *sc, struct mbuf *m)
+{
+	struct lagg_port *lp;
+
+	lp = lacp_select_tx_port(sc, m);
+	if (lp == NULL) {
+		m_freem(m);
+		return (EBUSY);
+	}
+
+	/* Send mbuf */
+	return (lagg_enqueue(lp->lp_ifp, m));
+}
+
+static struct mbuf *
+lagg_lacp_input(struct lagg_softc *sc, struct lagg_port *lp, struct mbuf *m)
+{
+	struct ifnet *ifp = sc->sc_ifp;
+	struct ether_header *eh;
+	u_short etype;
+
+	eh = mtod(m, struct ether_header *);
+	etype = ntohs(eh->ether_type);
+
+	/* Tap off LACP control messages */
+	if (etype == ETHERTYPE_SLOW) {
+		m = lacp_input(lp, m);
+		if (m == NULL)
+			return (NULL);
+	}
+
+	/*
+	 * If the port is not collecting or not in the active aggregator then
+	 * free and return.
+	 */
+	if (lacp_iscollecting(lp) == 0 || lacp_isactive(lp) == 0) {
+		m_freem(m);
+		return (NULL);
+	}
+
+	m->m_pkthdr.rcvif = ifp;
+	return (m);
+}