mtu_comments_up.patch
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	Jan 14 2016, 10:39 AM

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	Index: sys/net/if_lagg.c
	===================================================================
	--- sys/net/if_lagg.c (revision 292047)
	+++ sys/net/if_lagg.c (working copy)
	@@ -1,2219 +1,2418 @@
	/* $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>
	* Copyright (c) 2014 Marcelo Araujo <araujo@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 <sys/cdefs.h>
	__FBSDID("$FreeBSD$");

	#include "opt_inet.h"
	#include "opt_inet6.h"

	#include <sys/param.h>
	#include <sys/kernel.h>
	#include <sys/malloc.h>
	#include <sys/mbuf.h>
	#include <sys/queue.h>
	#include <sys/socket.h>
	#include <sys/sockio.h>
	#include <sys/sysctl.h>
	#include <sys/module.h>
	#include <sys/priv.h>
	#include <sys/systm.h>
	#include <sys/proc.h>
	#include <sys/lock.h>
	#include <sys/rmlock.h>
	#include <sys/taskqueue.h>
	#include <sys/eventhandler.h>

	#include <net/ethernet.h>
	#include <net/if.h>
	#include <net/if_clone.h>
	#include <net/if_arp.h>
	#include <net/if_dl.h>
	#include <net/if_media.h>
	#include <net/if_types.h>
	#include <net/if_var.h>
	#include <net/bpf.h>
	#include <net/vnet.h>

	#if defined(INET) \|\| defined(INET6)
	#include <netinet/in.h>
	#include <netinet/ip.h>
	#endif
	#ifdef INET
	#include <netinet/in_systm.h>
	#include <netinet/if_ether.h>
	#endif

	#ifdef INET6
	#include <netinet/ip6.h>
	#include <netinet6/in6_var.h>
	#include <netinet6/in6_ifattach.h>
	#endif

	#include <net/if_vlan_var.h>
	#include <net/if_lagg.h>
	#include <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}
	};

	VNET_DEFINE(SLIST_HEAD(__trhead, lagg_softc), lagg_list); /* list of laggs */
	#define V_lagg_list VNET(lagg_list)
	static VNET_DEFINE(struct mtx, lagg_list_mtx);
	#define V_lagg_list_mtx VNET(lagg_list_mtx)
	#define LAGG_LIST_LOCK_INIT(x) mtx_init(&V_lagg_list_mtx, \
	"if_lagg list", NULL, MTX_DEF)
	#define LAGG_LIST_LOCK_DESTROY(x) mtx_destroy(&V_lagg_list_mtx)
	#define LAGG_LIST_LOCK(x) mtx_lock(&V_lagg_list_mtx)
	#define LAGG_LIST_UNLOCK(x) mtx_unlock(&V_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 VNET_DEFINE(struct if_clone *, lagg_cloner);
	#define V_lagg_cloner VNET(lagg_cloner)
	static const char laggname[] = "lagg";

	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 , lagg_llqtype);
	-static void lagg_port_setlladdr(void *, int);
	+static void lagg_port_ops(void *, int);
	+static void lagg_llq_action_mtu(struct lagg_softc *,
	+ struct lagg_llq_slist_entry *);
	+static void lagg_llq_action_lladdr(struct lagg_softc *,
	+ struct lagg_llq_slist_entry *);
	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 ,
	const struct sockaddr , struct route );
	static void lagg_port_ifdetach(void arg __unused, struct ifnet );
	#ifdef LAGG_PORT_STACKING
	static int lagg_port_checkstacking(struct lagg_softc *);
	#endif
	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 uint64_t lagg_get_counter(struct ifnet *ifp, ift_counter cnt);
	static int lagg_transmit(struct ifnet , struct mbuf );
	static void lagg_qflush(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 int lagg_change_mtu(struct ifnet , struct ifreq );
	+static void _lagg_free_llq_entries(struct lagg_llq_slist_entry *);
	+static void lagg_free_llq_entries(struct lagg_softc *, lagg_llq_idx);

	/* Simple round robin */
	static void lagg_rr_attach(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_start(struct lagg_softc , struct mbuf );
	static struct mbuf lagg_fail_input(struct lagg_softc , struct lagg_port *,
	struct mbuf *);

	/* Loadbalancing */
	static void lagg_lb_attach(struct lagg_softc *);
	static void 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 );

	/* Broadcast */
	static int lagg_bcast_start(struct lagg_softc , struct mbuf );
	static struct mbuf lagg_bcast_input(struct lagg_softc , struct lagg_port *,
	struct mbuf *);

	/* 802.3ad LACP */
	static void lagg_lacp_attach(struct lagg_softc *);
	static void 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 *);

	+/*
	+ * This action handler shall be called from taskqueue handler for each
	+ * submitted operation
	+ */
	+typedef void (lagg_llq_action)(struct lagg_softc ,
	+ struct lagg_llq_slist_entry *);
	+
	+/*
	+ * lagg llq action Table: Called at the taskqueue context for each
	+ * submitted operations.
	+ * Contents SHOULD be in sync with lagg_llq_idx index.
	+ * New entries shall be appended.
	+ */
	+static const lagg_llq_action llq_action[LAGG_LLQ_MAX] = {
	+ lagg_llq_action_lladdr, /* Maps to LAGG_LLQ_LLADDR index */
	+ lagg_llq_action_mtu, /* Maps to LAGG_LLQ_MTU index */
	+};
	+
	/* lagg protocol table */
	static const struct lagg_proto {
	lagg_proto pr_num;
	void (pr_attach)(struct lagg_softc );
	void (pr_detach)(struct lagg_softc );
	int (pr_start)(struct lagg_softc , struct mbuf *);
	struct mbuf * (pr_input)(struct lagg_softc , struct lagg_port *,
	struct mbuf *);
	int (pr_addport)(struct lagg_port );
	void (pr_delport)(struct lagg_port );
	void (pr_linkstate)(struct lagg_port );
	void (pr_init)(struct lagg_softc );
	void (pr_stop)(struct lagg_softc );
	void (pr_lladdr)(struct lagg_softc );
	void (pr_request)(struct lagg_softc , void *);
	void (pr_portreq)(struct lagg_port , void *);
	} lagg_protos[] = {
	{
	.pr_num = LAGG_PROTO_NONE
	},
	{
	.pr_num = LAGG_PROTO_ROUNDROBIN,
	.pr_attach = lagg_rr_attach,
	.pr_start = lagg_rr_start,
	.pr_input = lagg_rr_input,
	},
	{
	.pr_num = LAGG_PROTO_FAILOVER,
	.pr_start = lagg_fail_start,
	.pr_input = lagg_fail_input,
	},
	{
	.pr_num = LAGG_PROTO_LOADBALANCE,
	.pr_attach = lagg_lb_attach,
	.pr_detach = lagg_lb_detach,
	.pr_start = lagg_lb_start,
	.pr_input = lagg_lb_input,
	.pr_addport = lagg_lb_port_create,
	.pr_delport = lagg_lb_port_destroy,
	},
	{
	.pr_num = LAGG_PROTO_LACP,
	.pr_attach = lagg_lacp_attach,
	.pr_detach = lagg_lacp_detach,
	.pr_start = lagg_lacp_start,
	.pr_input = lagg_lacp_input,
	.pr_addport = lacp_port_create,
	.pr_delport = lacp_port_destroy,
	.pr_linkstate = lacp_linkstate,
	.pr_init = lacp_init,
	.pr_stop = lacp_stop,
	.pr_lladdr = lagg_lacp_lladdr,
	.pr_request = lacp_req,
	.pr_portreq = lacp_portreq,
	},
	{
	.pr_num = LAGG_PROTO_BROADCAST,
	.pr_start = lagg_bcast_start,
	.pr_input = lagg_bcast_input,
	},
	};

	SYSCTL_DECL(_net_link);
	SYSCTL_NODE(_net_link, OID_AUTO, lagg, CTLFLAG_RW, 0,
	"Link Aggregation");

	/* Allow input on any failover links */
	static VNET_DEFINE(int, lagg_failover_rx_all);
	#define V_lagg_failover_rx_all VNET(lagg_failover_rx_all)
	SYSCTL_INT(_net_link_lagg, OID_AUTO, failover_rx_all, CTLFLAG_RW \| CTLFLAG_VNET,
	&VNET_NAME(lagg_failover_rx_all), 0,
	"Accept input from any interface in a failover lagg");

	/* Default value for using flowid */
	static VNET_DEFINE(int, def_use_flowid) = 1;
	#define V_def_use_flowid VNET(def_use_flowid)
	SYSCTL_INT(_net_link_lagg, OID_AUTO, default_use_flowid, CTLFLAG_RWTUN,
	&VNET_NAME(def_use_flowid), 0,
	"Default setting for using flow id for load sharing");

	/* Default value for flowid shift */
	static VNET_DEFINE(int, def_flowid_shift) = 16;
	#define V_def_flowid_shift VNET(def_flowid_shift)
	SYSCTL_INT(_net_link_lagg, OID_AUTO, default_flowid_shift, CTLFLAG_RWTUN,
	&VNET_NAME(def_flowid_shift), 0,
	"Default setting for flowid shift for load sharing");

	static void
	vnet_lagg_init(const void *unused __unused)
	{

	LAGG_LIST_LOCK_INIT();
	SLIST_INIT(&V_lagg_list);
	V_lagg_cloner = if_clone_simple(laggname, lagg_clone_create,
	lagg_clone_destroy, 0);
	}
	VNET_SYSINIT(vnet_lagg_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
	vnet_lagg_init, NULL);

	static void
	vnet_lagg_uninit(const void *unused __unused)
	{

	if_clone_detach(V_lagg_cloner);
	LAGG_LIST_LOCK_DESTROY();
	}
	VNET_SYSUNINIT(vnet_lagg_uninit, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
	vnet_lagg_uninit, NULL);

	static int
	lagg_modevent(module_t mod, int type, void *data)
	{

	switch (type) {
	case MOD_LOAD:
	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);
	lagg_input_p = NULL;
	lagg_linkstate_p = NULL;
	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);
	MODULE_VERSION(if_lagg, 1);

	static void
	lagg_proto_attach(struct lagg_softc *sc, lagg_proto pr)
	{

	KASSERT(sc->sc_proto == LAGG_PROTO_NONE, ("%s: sc %p has proto",
	__func__, sc));

	if (sc->sc_ifflags & IFF_DEBUG)
	if_printf(sc->sc_ifp, "using proto %u\n", pr);

	if (lagg_protos[pr].pr_attach != NULL)
	lagg_protos[pr].pr_attach(sc);
	sc->sc_proto = pr;
	}

	static void
	lagg_proto_detach(struct lagg_softc *sc)
	{
	lagg_proto pr;

	LAGG_WLOCK_ASSERT(sc);

	pr = sc->sc_proto;
	sc->sc_proto = LAGG_PROTO_NONE;

	if (lagg_protos[pr].pr_detach != NULL)
	lagg_protos[pr].pr_detach(sc);
	else
	LAGG_WUNLOCK(sc);
	}

	static int
	lagg_proto_start(struct lagg_softc sc, struct mbuf m)
	{

	return (lagg_protos[sc->sc_proto].pr_start(sc, m));
	}

	static struct mbuf *
	lagg_proto_input(struct lagg_softc sc, struct lagg_port lp, struct mbuf *m)
	{

	return (lagg_protos[sc->sc_proto].pr_input(sc, lp, m));
	}

	static int
	lagg_proto_addport(struct lagg_softc sc, struct lagg_port lp)
	{

	if (lagg_protos[sc->sc_proto].pr_addport == NULL)
	return (0);
	else
	return (lagg_protos[sc->sc_proto].pr_addport(lp));
	}

	static void
	lagg_proto_delport(struct lagg_softc sc, struct lagg_port lp)
	{

	if (lagg_protos[sc->sc_proto].pr_delport != NULL)
	lagg_protos[sc->sc_proto].pr_delport(lp);
	}

	static void
	lagg_proto_linkstate(struct lagg_softc sc, struct lagg_port lp)
	{

	if (lagg_protos[sc->sc_proto].pr_linkstate != NULL)
	lagg_protos[sc->sc_proto].pr_linkstate(lp);
	}

	static void
	lagg_proto_init(struct lagg_softc *sc)
	{

	if (lagg_protos[sc->sc_proto].pr_init != NULL)
	lagg_protos[sc->sc_proto].pr_init(sc);
	}

	static void
	lagg_proto_stop(struct lagg_softc *sc)
	{

	if (lagg_protos[sc->sc_proto].pr_stop != NULL)
	lagg_protos[sc->sc_proto].pr_stop(sc);
	}

	static void
	lagg_proto_lladdr(struct lagg_softc *sc)
	{

	if (lagg_protos[sc->sc_proto].pr_lladdr != NULL)
	lagg_protos[sc->sc_proto].pr_lladdr(sc);
	}

	static void
	lagg_proto_request(struct lagg_softc sc, void v)
	{

	if (lagg_protos[sc->sc_proto].pr_request != NULL)
	lagg_protos[sc->sc_proto].pr_request(sc, v);
	}

	static void
	lagg_proto_portreq(struct lagg_softc sc, struct lagg_port lp, void *v)
	{

	if (lagg_protos[sc->sc_proto].pr_portreq != NULL)
	lagg_protos[sc->sc_proto].pr_portreq(lp, v);
	}

	/*
	* 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;
	struct rm_priotracker tracker;

	if (ifp->if_softc != arg) /* Not our event */
	return;

	LAGG_RLOCK(sc, &tracker);
	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, &tracker);
	}

	/*
	* 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;
	struct rm_priotracker tracker;

	if (ifp->if_softc != arg) /* Not our event */
	return;

	LAGG_RLOCK(sc, &tracker);
	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, &tracker);
	}

	static int
	lagg_clone_create(struct if_clone *ifc, int unit, caddr_t params)
	{
	struct lagg_softc *sc;
	struct ifnet *ifp;
	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);
	}

	if (V_def_use_flowid)
	sc->sc_opts \|= LAGG_OPT_USE_FLOWID;
	sc->flowid_shift = V_def_flowid_shift;

	/* Hash all layers by default */
	sc->sc_flags = MBUF_HASHFLAG_L2\|MBUF_HASHFLAG_L3\|MBUF_HASHFLAG_L4;

	lagg_proto_attach(sc, LAGG_PROTO_DEFAULT);

	LAGG_LOCK_INIT(sc);
	SLIST_INIT(&sc->sc_ports);
	- TASK_INIT(&sc->sc_lladdr_task, 0, lagg_port_setlladdr, sc);
	+ TASK_INIT(&sc->sc_llq_task, 0, lagg_port_ops, 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, laggname, unit);
	ifp->if_softc = sc;
	ifp->if_transmit = lagg_transmit;
	ifp->if_qflush = lagg_qflush;
	ifp->if_init = lagg_init;
	ifp->if_ioctl = lagg_ioctl;
	ifp->if_get_counter = lagg_get_counter;
	ifp->if_flags = IFF_SIMPLEX \| IFF_BROADCAST \| IFF_MULTICAST;
	ifp->if_capenable = ifp->if_capabilities = IFCAP_HWSTATS;

	+ mtx_init(&sc->sc_mtu_ctxt.mtu_sync.lock, ifp->if_xname,
	+ "mtu_sync_lock", MTX_DEF);
	+ cv_init(&sc->sc_mtu_ctxt.mtu_sync.cv, "mtu_sync_cv");
	+
	/*
	* Attach as an ordinary ethernet device, children will be attached
	* as special device IFT_IEEE8023ADLAG.
	*/
	ether_ifattach(ifp, eaddr);

	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);

	/* Insert into the global list of laggs */
	LAGG_LIST_LOCK();
	SLIST_INSERT_HEAD(&V_lagg_list, sc, sc_entries);
	LAGG_LIST_UNLOCK();

	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;

	EVENTHANDLER_DEREGISTER(vlan_config, sc->vlan_attach);
	EVENTHANDLER_DEREGISTER(vlan_unconfig, sc->vlan_detach);

	/* Shutdown and remove lagg ports */
	while ((lp = SLIST_FIRST(&sc->sc_ports)) != NULL)
	lagg_port_destroy(lp, 1);
	/* Unhook the aggregation protocol */
	lagg_proto_detach(sc);
	LAGG_UNLOCK_ASSERT(sc);

	ifmedia_removeall(&sc->sc_media);
	ether_ifdetach(ifp);
	if_free(ifp);

	LAGG_LIST_LOCK();
	SLIST_REMOVE(&V_lagg_list, sc, lagg_softc, sc_entries);
	LAGG_LIST_UNLOCK();

	- taskqueue_drain(taskqueue_swi, &sc->sc_lladdr_task);
	+ taskqueue_drain(taskqueue_swi, &sc->sc_llq_task);
	+ cv_destroy(&sc->sc_mtu_ctxt.mtu_sync.cv);
	+ mtx_destroy(&sc->sc_mtu_ctxt.mtu_sync.lock);
	LAGG_LOCK_DESTROY(sc);
	free(sc, M_DEVBUF);
	}

	/*
	* Set link-layer address on the lagg interface itself.
	*
	* Set noinline to be dtrace-friendly
	*/
	static __noinline void
	lagg_lladdr(struct lagg_softc sc, uint8_t lladdr)
	{
	struct ifnet *ifp = sc->sc_ifp;
	struct lagg_port lp;

	if (memcmp(lladdr, IF_LLADDR(ifp), ETHER_ADDR_LEN) == 0)
	return;

	LAGG_WLOCK_ASSERT(sc);
	/*
	* Set the link layer address on the lagg interface.
	* lagg_proto_lladdr() notifies the MAC change to
	* the aggregation protocol. iflladdr_event handler which
	* may trigger gratuitous ARPs for INET will be handled in
	* a taskqueue.
	*/
	bcopy(lladdr, IF_LLADDR(ifp), ETHER_ADDR_LEN);
	lagg_proto_lladdr(sc);

	/*
	* Send notification request for lagg interface
	* itself. Note that new lladdr is already set.
	*/
	bzero(&lp, sizeof(lp));
	lp.lp_ifp = sc->sc_ifp;
	lp.lp_softc = sc;

	/* Do not request lladdr change */
	lagg_port_lladdr(&lp, lladdr, LAGG_LLQTYPE_VIRT);
	}

	static void
	lagg_capabilities(struct lagg_softc *sc)
	{
	struct lagg_port *lp;
	int cap = ~0, ena = ~0;
	u_long hwa = ~0UL;
	struct ifnet_hw_tsomax hw_tsomax;

	LAGG_WLOCK_ASSERT(sc);

	memset(&hw_tsomax, 0, sizeof(hw_tsomax));

	/* 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;
	if_hw_tsomax_common(lp->lp_ifp, &hw_tsomax);
	}
	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 \|\|
	if_hw_tsomax_update(sc->sc_ifp, &hw_tsomax) != 0) {
	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);
	}
	}

	/*
	* Enqueue interface lladdr notification.
	* If request is already queued, it is updated.
	* If setting lladdr is also desired, @do_change has to be set to 1.
	*
	* Set noinline to be dtrace-friendly
	*/
	static __noinline void
	lagg_port_lladdr(struct lagg_port lp, uint8_t lladdr, lagg_llqtype llq_type)
	{
	struct lagg_softc *sc = lp->lp_softc;
	struct ifnet *ifp = lp->lp_ifp;
	- struct lagg_llq *llq;
	+ struct lagg_llq_slist_entry *cmn_llq;
	+ struct lagg_lladdr_llq_ctxt *llq_ctxt;

	LAGG_WLOCK_ASSERT(sc);

	/*
	* Do not enqueue requests where lladdr is the same for
	* "physical" interfaces (e.g. ports in lagg)
	*/
	if (llq_type == LAGG_LLQTYPE_PHYS &&
	memcmp(IF_LLADDR(ifp), lladdr, 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) {
	+ SLIST_FOREACH(cmn_llq, &sc->sc_llq[LAGG_LLQ_LLADDR],
	+ llq_entries) {
	+ llq_ctxt = (struct lagg_lladdr_llq_ctxt *)cmn_llq;
	+ if (llq_ctxt->llq_ifp == ifp) {
	/* Update lladdr, it may have changed */
	- bcopy(lladdr, llq->llq_lladdr, ETHER_ADDR_LEN);
	+ bcopy(lladdr, llq_ctxt->llq_lladdr, ETHER_ADDR_LEN);
	return;
	}
	}

	- llq = malloc(sizeof(struct lagg_llq), M_DEVBUF, M_NOWAIT \| M_ZERO);
	- if (llq == NULL) /* XXX what to do */
	+ llq_ctxt = malloc(sizeof(struct lagg_lladdr_llq_ctxt), M_DEVBUF,
	+ M_NOWAIT \| M_ZERO);
	+ if (llq_ctxt == NULL) /* XXX what to do */
	return;

	- llq->llq_ifp = ifp;
	- llq->llq_type = llq_type;
	- bcopy(lladdr, llq->llq_lladdr, ETHER_ADDR_LEN);
	+ llq_ctxt->llq_ifp = ifp;
	+ llq_ctxt->llq_type = llq_type;
	+ bcopy(lladdr, llq_ctxt->llq_lladdr, ETHER_ADDR_LEN);
	/* XXX: We should insert to tail */
	- SLIST_INSERT_HEAD(&sc->sc_llq_head, llq, llq_entries);
	+ SLIST_INSERT_HEAD(&sc->sc_llq[LAGG_LLQ_LLADDR],
	+ (struct lagg_llq_slist_entry *)llq_ctxt, llq_entries);

	- taskqueue_enqueue(taskqueue_swi, &sc->sc_lladdr_task);
	+ taskqueue_enqueue(taskqueue_swi, &sc->sc_llq_task);
	}

	/*
	- * Set the interface MAC address from a taskqueue to avoid a LOR.
	+ * Set the interface MTU, MAC address from a taskqueue to avoid a LOR.
	*
	* Set noinline to be dtrace-friendly
	*/
	static __noinline void
	-lagg_port_setlladdr(void *arg, int pending)
	+lagg_port_ops(void *arg, int pending)
	{
	struct lagg_softc sc = (struct lagg_softc )arg;
	- struct lagg_llq llq, head;
	- struct ifnet *ifp;
	+ struct lagg_llq_slist_entry *llq_first;
	+ lagg_llq_idx llq_idx;
	+
	+ for (llq_idx = LAGG_LLQ_MIN; llq_idx < LAGG_LLQ_MAX; llq_idx++) {
	+ LAGG_WLOCK(sc);
	+ llq_first = SLIST_FIRST(&sc->sc_llq[llq_idx]);
	+ SLIST_INIT(&sc->sc_llq[llq_idx]);
	+ LAGG_WUNLOCK(sc);
	+
	+ if (llq_first != NULL)
	+ llq_action[llq_idx](sc, llq_first);
	+ }
	+}
	+
	+static void
	+lagg_llq_action_mtu(struct lagg_softc sc, struct lagg_llq_slist_entry first)
	+{
	+ struct lagg_llq_slist_entry *llq;
	+ int err;
	+
	+ err = EIO;
	+ /* Set the new MTU on the lagg interface */
	+ LAGG_WLOCK(sc);
	+ sc->sc_ifp->if_mtu = ((struct lagg_mtu_llq_ctxt *)first)->llq_ifr.ifr_mtu;
	+ LAGG_WUNLOCK(sc);
	+
	+ /*
	+ * Traverse the queue and set the mtu on each ifp. It is safe to do
	+ * unlocked as we have the only reference to it.
	+ */
	+ llq = first;
	+ SLIST_FOREACH_FROM(llq, (struct __llqhd *)NULL, llq_entries) {
	+ struct lagg_mtu_llq_ctxt *llq_ctxt;
	+
	+ llq_ctxt = (struct lagg_mtu_llq_ctxt *)llq;
	+ /* Set the new MTU on the physical interface */
	+ err = (*llq_ctxt->llq_ioctl)(llq_ctxt->llq_ifp, SIOCSIFMTU,
	+ (caddr_t)&llq_ctxt->llq_ifr);
	+ if (err) {
	+ if_printf(llq_ctxt->llq_ifp,
	+ "Failed to change MTU from %d to %d (err %d)\n",
	+ llq_ctxt->llq_old_mtu, llq_ctxt->llq_ifr.ifr_mtu, err);
	+ break;
	+ }
	+ }
	+
	+ if (err) {
	+ /* Restore the old MTU on the lagg interface */
	+ LAGG_WLOCK(sc);
	+ sc->sc_ifp->if_mtu = ((struct lagg_mtu_llq_ctxt *)first)->llq_old_mtu;
	+ LAGG_WUNLOCK(sc);
	+
	+ /* Restore the old MTU on the physical interface */
	+ llq = first;
	+ SLIST_FOREACH_FROM(llq, (struct __llqhd *)NULL, llq_entries) {
	+ struct lagg_mtu_llq_ctxt *llq_ctxt;
	+
	+ llq_ctxt = (struct lagg_mtu_llq_ctxt *)llq;
	+ llq_ctxt->llq_ifr.ifr_mtu = llq_ctxt->llq_old_mtu;
	+ err = (*llq_ctxt->llq_ioctl)
	+ (llq_ctxt->llq_ifp, SIOCSIFMTU, (caddr_t)&llq_ctxt->llq_ifr);
	+ if (err) {
	+ if_printf(llq_ctxt->llq_ifp,
	+ "Failed to restore MTU to %d (err %d)\n",
	+ llq_ctxt->llq_old_mtu, err);
	+ }
	+ }
	+ }
	+
	+ /* Free the MTU LLQ entries */
	+ _lagg_free_llq_entries(first);
	+
	+ mtx_lock(&sc->sc_mtu_ctxt.mtu_sync.lock);
	+ sc->sc_mtu_ctxt.mtu_cmd_ret = err;
	+ /* Signal for command completion */
	+ cv_signal(&sc->sc_mtu_ctxt.mtu_sync.cv);
	+ mtx_unlock(&sc->sc_mtu_ctxt.mtu_sync.lock);
	+}
	+
	+static void
	+_lagg_free_llq_entries(struct lagg_llq_slist_entry *llq)
	+{
	+ struct lagg_llq_slist_entry *tmp_llq;

	- /* Grab a local reference of the queue and remove it from the softc */
	+ SLIST_FOREACH_FROM_SAFE(llq, (struct __llqhd *)NULL, llq_entries,
	+ tmp_llq) {
	+ free(llq, M_DEVBUF);
	+ }
	+}
	+
	+static void
	+lagg_free_llq_entries(struct lagg_softc *sc, lagg_llq_idx idx)
	+{
	+ struct lagg_llq_slist_entry *llq;
	+
	+ LAGG_WLOCK_ASSERT(sc);
	+
	+ llq = SLIST_FIRST(&sc->sc_llq[idx]);
	+ SLIST_INIT(&sc->sc_llq[idx]);
	+
	+ _lagg_free_llq_entries(llq);
	+}
	+
	+static int
	+lagg_change_mtu(struct ifnet ifp, struct ifreq ifr)
	+{
	+ struct lagg_softc *sc;
	+ struct lagg_port *lp;
	+ struct lagg_mtu_llq_ctxt *llq_ctxt;
	+ int ret;
	+
	+ sc = (struct lagg_softc *)ifp->if_softc;
	+ ret = 0;
	+
	+ LAGG_WLOCK(sc);
	+ if (SLIST_EMPTY(&sc->sc_ports)) {
	+ LAGG_WUNLOCK(sc);
	+ return (EIO);
	+ } else if (sc->sc_mtu_ctxt.busy) {
	+ LAGG_WUNLOCK(sc);
	+ return (EBUSY);
	+ } else if (ifp->if_mtu == ifr->ifr_mtu) {
	+ LAGG_WUNLOCK(sc);
	+ return (0);
	+ }
	+ sc->sc_mtu_ctxt.busy = TRUE;
	+
	+ SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
	+ llq_ctxt = malloc(sizeof(struct lagg_mtu_llq_ctxt), M_DEVBUF,
	+ M_NOWAIT);
	+ if (llq_ctxt == NULL) {
	+ lagg_free_llq_entries(sc, LAGG_LLQ_MTU);
	+ ret = ENOMEM;
	+ goto out;
	+ }
	+ SLIST_INSERT_HEAD(&sc->sc_llq[LAGG_LLQ_MTU],
	+ (struct lagg_llq_slist_entry *)llq_ctxt, llq_entries);
	+
	+ bcopy(ifr, &llq_ctxt->llq_ifr, sizeof(struct ifreq));
	+ llq_ctxt->llq_old_mtu = ifp->if_mtu;
	+ llq_ctxt->llq_ifp = lp->lp_ifp;
	+ llq_ctxt->llq_ioctl = lp->lp_ioctl;
	+ }
	+ mtx_lock(&sc->sc_mtu_ctxt.mtu_sync.lock);
	+ taskqueue_enqueue(taskqueue_swi, &sc->sc_llq_task);
	+ LAGG_WUNLOCK(sc);
	+
	+ /* Wait for the command completion */
	+ cv_wait(&sc->sc_mtu_ctxt.mtu_sync.cv, &sc->sc_mtu_ctxt.mtu_sync.lock);
	+ ret = sc->sc_mtu_ctxt.mtu_cmd_ret;
	+ mtx_unlock(&sc->sc_mtu_ctxt.mtu_sync.lock);
	LAGG_WLOCK(sc);
	- head = SLIST_FIRST(&sc->sc_llq_head);
	- SLIST_FIRST(&sc->sc_llq_head) = NULL;
	+
	+out:
	+ sc->sc_mtu_ctxt.busy = FALSE;
	LAGG_WUNLOCK(sc);
	+ return (ret);
	+}
	+
	+static void
	+lagg_llq_action_lladdr(struct lagg_softc *sc,
	+ struct lagg_llq_slist_entry *head)
	+{
	+ struct lagg_lladdr_llq_ctxt *llq_ctxt;
	+ struct lagg_llq_slist_entry *llq;
	+ struct ifnet *ifp;

	/*
	* 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;
	+ llq_ctxt = (struct lagg_lladdr_llq_ctxt *)llq;
	+ ifp = llq_ctxt->llq_ifp;

	CURVNET_SET(ifp->if_vnet);

	/*
	* Set the link layer address on the laggport interface.
	* Note that if_setlladdr() or iflladdr_event handler
	* may result in arp transmission / lltable updates.
	*/
	- if (llq->llq_type == LAGG_LLQTYPE_PHYS)
	- if_setlladdr(ifp, llq->llq_lladdr,
	+ if (llq_ctxt->llq_type == LAGG_LLQTYPE_PHYS)
	+ if_setlladdr(ifp, llq_ctxt->llq_lladdr,
	ETHER_ADDR_LEN);
	else
	EVENTHANDLER_INVOKE(iflladdr_event, ifp);
	CURVNET_RESTORE();
	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, tlp;
	int error, i;
	uint64_t *pval;

	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) {
	/* Port is already in the current lagg? */
	lp = (struct lagg_port *)ifp->if_lagg;
	if (lp->lp_softc == sc)
	return (EEXIST);
	return (EBUSY);
	}

	/* XXX Disallow non-ethernet interfaces (this should be any of 802) */
	if (ifp->if_type != IFT_ETHER && ifp->if_type != IFT_L2VLAN)
	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 */
	LAGG_LIST_LOCK();
	SLIST_FOREACH(sc_ptr, &V_lagg_list, sc_entries) {
	if (ifp == sc_ptr->sc_ifp) {
	LAGG_LIST_UNLOCK();
	free(lp, M_DEVBUF);
	return (EINVAL);
	/* XXX disable stacking for the moment, its untested */
	#ifdef LAGG_PORT_STACKING
	lp->lp_flags \|= LAGG_PORT_STACK;
	if (lagg_port_checkstacking(sc_ptr) >=
	LAGG_MAX_STACKING) {
	LAGG_LIST_UNLOCK();
	free(lp, M_DEVBUF);
	return (E2BIG);
	}
	#endif
	}
	}
	LAGG_LIST_UNLOCK();

	/* 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;
	/* First port in lagg. Update/notify lagg lladdress */
	lagg_lladdr(sc, IF_LLADDR(ifp));
	} else {

	/*
	* Update link layer address for this port and
	* send notifications to other subsystems.
	*/
	lagg_port_lladdr(lp, IF_LLADDR(sc->sc_ifp), LAGG_LLQTYPE_PHYS);
	}

	/*
	* Insert into the list of ports.
	* Keep ports sorted by if_index. It is handy, when configuration
	* is predictable and `ifconfig laggN create ...` command
	* will lead to the same result each time.
	*/
	SLIST_FOREACH(tlp, &sc->sc_ports, lp_entries) {
	if (tlp->lp_ifp->if_index < ifp->if_index && (
	SLIST_NEXT(tlp, lp_entries) == NULL \|\|
	SLIST_NEXT(tlp, lp_entries)->lp_ifp->if_index >
	ifp->if_index))
	break;
	}
	if (tlp != NULL)
	SLIST_INSERT_AFTER(tlp, lp, lp_entries);
	else
	SLIST_INSERT_HEAD(&sc->sc_ports, lp, lp_entries);
	sc->sc_count++;

	/* Update lagg capabilities */
	lagg_capabilities(sc);
	lagg_linkstate(sc);

	/* Read port counters */
	pval = lp->port_counters.val;
	for (i = 0; i < IFCOUNTERS; i++, pval++)
	*pval = ifp->if_get_counter(ifp, i);
	/* Add multicast addresses and interface flags to this port */
	lagg_ether_cmdmulti(lp, 1);
	lagg_setflags(lp, 1);

	if ((error = lagg_proto_addport(sc, lp)) != 0) {
	/* Remove the port, without calling pr_delport. */
	lagg_port_destroy(lp, 0);
	return (error);
	}

	return (0);
	}

	#ifdef LAGG_PORT_STACKING
	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);
	}
	#endif

	static int
	lagg_port_destroy(struct lagg_port *lp, int rundelport)
	{
	struct lagg_softc *sc = lp->lp_softc;
	struct lagg_port lp_ptr, lp0;
	- struct lagg_llq *llq;
	+ struct lagg_llq_slist_entry *cmn_llq;
	+ struct lagg_lladdr_llq_ctxt *llq_ctxt;
	struct ifnet *ifp = lp->lp_ifp;
	uint64_t *pval, vdiff;
	int i;

	LAGG_WLOCK_ASSERT(sc);

	if (rundelport)
	lagg_proto_delport(sc, 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, LAGG_LLQTYPE_PHYS);
	}

	/* Restore interface */
	ifp->if_type = lp->lp_iftype;
	ifp->if_ioctl = lp->lp_ioctl;
	ifp->if_output = lp->lp_output;
	ifp->if_lagg = NULL;

	/* Update detached port counters */
	pval = lp->port_counters.val;
	for (i = 0; i < IFCOUNTERS; i++, pval++) {
	vdiff = ifp->if_get_counter(ifp, i) - *pval;
	sc->detached_counters.val[i] += vdiff;
	}

	/* 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 ((lp0 = SLIST_FIRST(&sc->sc_ports)) == NULL) {
	bzero(&lladdr, ETHER_ADDR_LEN);
	} else {
	bcopy(lp0->lp_lladdr,
	lladdr, ETHER_ADDR_LEN);
	}
	lagg_lladdr(sc, lladdr);

	/* Mark lp0 as new primary */
	sc->sc_primary = lp0;

	/*
	* Enqueue lladdr update/notification for each port
	* (new primary needs update as well, to switch from
	* old lladdr to its 'real' one).
	*/
	SLIST_FOREACH(lp_ptr, &sc->sc_ports, lp_entries)
	lagg_port_lladdr(lp_ptr, lladdr, LAGG_LLQTYPE_PHYS);
	}

	/* 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);
	+ SLIST_FOREACH(cmn_llq, &sc->sc_llq[LAGG_LLQ_LLADDR], llq_entries) {
	+ llq_ctxt = (struct lagg_lladdr_llq_ctxt *)cmn_llq;
	+ if (llq_ctxt->llq_ifp == ifp) {
	+ SLIST_REMOVE(&sc->sc_llq[LAGG_LLQ_LLADDR], cmn_llq,
	+ lagg_llq_slist_entry, llq_entries);
	+ free(cmn_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;
	struct rm_priotracker tracker;

	/* 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, &tracker);
	if ((lp = ifp->if_lagg) == NULL \|\| lp->lp_softc != sc) {
	error = ENOENT;
	LAGG_RUNLOCK(sc, &tracker);
	break;
	}

	lagg_port2req(lp, rp);
	LAGG_RUNLOCK(sc, &tracker);
	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);
	}

	/*
	* Requests counter @cnt data.
	*
	* Counter value is calculated the following way:
	* 1) for each port, sum difference between current and "initial" measurements.
	* 2) add lagg logical interface counters.
	* 3) add data from detached_counters array.
	*
	* We also do the following things on ports attach/detach:
	* 1) On port attach we store all counters it has into port_counter array.
	* 2) On port detach we add the different between "initial" and
	* current counters data to detached_counters array.
	*/
	static uint64_t
	lagg_get_counter(struct ifnet *ifp, ift_counter cnt)
	{
	struct lagg_softc *sc;
	struct lagg_port *lp;
	struct ifnet *lpifp;
	struct rm_priotracker tracker;
	uint64_t newval, oldval, vsum;

	/* Revise this when we've got non-generic counters. */
	KASSERT(cnt < IFCOUNTERS, ("%s: invalid cnt %d", __func__, cnt));

	sc = (struct lagg_softc *)ifp->if_softc;
	LAGG_RLOCK(sc, &tracker);

	vsum = 0;
	SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
	/* Saved attached value */
	oldval = lp->port_counters.val[cnt];
	/* current value */
	lpifp = lp->lp_ifp;
	newval = lpifp->if_get_counter(lpifp, cnt);
	/* Calculate diff and save new */
	vsum += newval - oldval;
	}

	/*
	* Add counter data which might be added by upper
	* layer protocols operating on logical interface.
	*/
	vsum += if_get_counter_default(ifp, cnt);

	/*
	* Add counter data from detached ports counters
	*/
	vsum += sc->detached_counters.val[cnt];

	LAGG_RUNLOCK(sc, &tracker);

	return (vsum);
	}

	/*
	* For direct output to child ports.
	*/
	static int
	lagg_port_output(struct ifnet ifp, struct mbuf m,
	const struct sockaddr dst, struct route ro)
	{
	struct lagg_port *lp = ifp->if_lagg;

	switch (dst->sa_family) {
	case pseudo_AF_HDRCMPLT:
	case AF_UNSPEC:
	return ((*lp->lp_output)(ifp, m, dst, ro));
	}

	/* drop any other frames */
	m_freem(m);
	return (ENETDOWN);
	}

	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;
	/* If the ifnet is just being renamed, don't do anything. */
	if (ifp->if_flags & IFF_RENAMING)
	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;
	lagg_proto_portreq(sc, lp, &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_BROADCAST:
	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 ifnet *ifp = sc->sc_ifp;
	struct lagg_port *lp;

	if (ifp->if_drv_flags & IFF_DRV_RUNNING)
	return;

	LAGG_WLOCK(sc);

	ifp->if_drv_flags \|= IFF_DRV_RUNNING;

	/*
	* Update the port lladdrs if needed.
	* This might be if_setlladdr() notification
	* that lladdr has been changed.
	*/
	SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
	lagg_port_lladdr(lp, IF_LLADDR(ifp), LAGG_LLQTYPE_PHYS);

	lagg_proto_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;

	lagg_proto_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_reqopts ro = (struct lagg_reqopts )data;
	struct lagg_reqport rp = (struct lagg_reqport )data, rpbuf;
	struct lagg_reqflags rf = (struct lagg_reqflags )data;
	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;
	struct rm_priotracker tracker;

	bzero(&rpbuf, sizeof(rpbuf));

	switch (cmd) {
	case SIOCGLAGG:
	LAGG_RLOCK(sc, &tracker);
	count = 0;
	SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
	count++;
	buflen = count * sizeof(struct lagg_reqport);
	LAGG_RUNLOCK(sc, &tracker);

	outbuf = malloc(buflen, M_TEMP, M_WAITOK \| M_ZERO);

	LAGG_RLOCK(sc, &tracker);
	ra->ra_proto = sc->sc_proto;
	lagg_proto_request(sc, &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, &tracker);
	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 < 1 \|\| ra->ra_proto >= LAGG_PROTO_MAX) {
	error = EPROTONOSUPPORT;
	break;
	}

	LAGG_WLOCK(sc);
	lagg_proto_detach(sc);
	LAGG_UNLOCK_ASSERT(sc);
	lagg_proto_attach(sc, ra->ra_proto);
	break;
	case SIOCGLAGGOPTS:
	ro->ro_opts = sc->sc_opts;
	if (sc->sc_proto == LAGG_PROTO_LACP) {
	struct lacp_softc *lsc;

	lsc = (struct lacp_softc *)sc->sc_psc;
	if (lsc->lsc_debug.lsc_tx_test != 0)
	ro->ro_opts \|= LAGG_OPT_LACP_TXTEST;
	if (lsc->lsc_debug.lsc_rx_test != 0)
	ro->ro_opts \|= LAGG_OPT_LACP_RXTEST;
	if (lsc->lsc_strict_mode != 0)
	ro->ro_opts \|= LAGG_OPT_LACP_STRICT;
	if (lsc->lsc_fast_timeout != 0)
	ro->ro_opts \|= LAGG_OPT_LACP_TIMEOUT;

	ro->ro_active = sc->sc_active;
	} else {
	ro->ro_active = 0;
	SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
	ro->ro_active += LAGG_PORTACTIVE(lp);
	}
	ro->ro_flapping = sc->sc_flapping;
	ro->ro_flowid_shift = sc->flowid_shift;
	break;
	case SIOCSLAGGOPTS:
	error = priv_check(td, PRIV_NET_LAGG);
	if (error)
	break;
	if (ro->ro_opts == 0)
	break;
	/*
	* Set options. LACP options are stored in sc->sc_psc,
	* not in sc_opts.
	*/
	int valid, lacp;

	switch (ro->ro_opts) {
	case LAGG_OPT_USE_FLOWID:
	case -LAGG_OPT_USE_FLOWID:
	case LAGG_OPT_FLOWIDSHIFT:
	valid = 1;
	lacp = 0;
	break;
	case LAGG_OPT_LACP_TXTEST:
	case -LAGG_OPT_LACP_TXTEST:
	case LAGG_OPT_LACP_RXTEST:
	case -LAGG_OPT_LACP_RXTEST:
	case LAGG_OPT_LACP_STRICT:
	case -LAGG_OPT_LACP_STRICT:
	case LAGG_OPT_LACP_TIMEOUT:
	case -LAGG_OPT_LACP_TIMEOUT:
	valid = lacp = 1;
	break;
	default:
	valid = lacp = 0;
	break;
	}

	LAGG_WLOCK(sc);
	if (valid == 0 \|\|
	(lacp == 1 && sc->sc_proto != LAGG_PROTO_LACP)) {
	/* Invalid combination of options specified. */
	error = EINVAL;
	LAGG_WUNLOCK(sc);
	break; /* Return from SIOCSLAGGOPTS. */
	}
	/*
	* Store new options into sc->sc_opts except for
	* FLOWIDSHIFT and LACP options.
	*/
	if (lacp == 0) {
	if (ro->ro_opts == LAGG_OPT_FLOWIDSHIFT)
	sc->flowid_shift = ro->ro_flowid_shift;
	else if (ro->ro_opts > 0)
	sc->sc_opts \|= ro->ro_opts;
	else
	sc->sc_opts &= ~ro->ro_opts;
	} else {
	struct lacp_softc *lsc;
	struct lacp_port *lp;

	lsc = (struct lacp_softc *)sc->sc_psc;

	switch (ro->ro_opts) {
	case LAGG_OPT_LACP_TXTEST:
	lsc->lsc_debug.lsc_tx_test = 1;
	break;
	case -LAGG_OPT_LACP_TXTEST:
	lsc->lsc_debug.lsc_tx_test = 0;
	break;
	case LAGG_OPT_LACP_RXTEST:
	lsc->lsc_debug.lsc_rx_test = 1;
	break;
	case -LAGG_OPT_LACP_RXTEST:
	lsc->lsc_debug.lsc_rx_test = 0;
	break;
	case LAGG_OPT_LACP_STRICT:
	lsc->lsc_strict_mode = 1;
	break;
	case -LAGG_OPT_LACP_STRICT:
	lsc->lsc_strict_mode = 0;
	break;
	case LAGG_OPT_LACP_TIMEOUT:
	LACP_LOCK(lsc);
	LIST_FOREACH(lp, &lsc->lsc_ports, lp_next)
	lp->lp_state \|= LACP_STATE_TIMEOUT;
	LACP_UNLOCK(lsc);
	lsc->lsc_fast_timeout = 1;
	break;
	case -LAGG_OPT_LACP_TIMEOUT:
	LACP_LOCK(lsc);
	LIST_FOREACH(lp, &lsc->lsc_ports, lp_next)
	lp->lp_state &= ~LACP_STATE_TIMEOUT;
	LACP_UNLOCK(lsc);
	lsc->lsc_fast_timeout = 0;
	break;
	}
	}
	LAGG_WUNLOCK(sc);
	break;
	case SIOCGLAGGFLAGS:
	rf->rf_flags = 0;
	LAGG_RLOCK(sc, &tracker);
	if (sc->sc_flags & MBUF_HASHFLAG_L2)
	rf->rf_flags \|= LAGG_F_HASHL2;
	if (sc->sc_flags & MBUF_HASHFLAG_L3)
	rf->rf_flags \|= LAGG_F_HASHL3;
	if (sc->sc_flags & MBUF_HASHFLAG_L4)
	rf->rf_flags \|= LAGG_F_HASHL4;
	LAGG_RUNLOCK(sc, &tracker);
	break;
	case SIOCSLAGGHASH:
	error = priv_check(td, PRIV_NET_LAGG);
	if (error)
	break;
	if ((rf->rf_flags & LAGG_F_HASHMASK) == 0) {
	error = EINVAL;
	break;
	}
	LAGG_WLOCK(sc);
	sc->sc_flags = 0;
	if (rf->rf_flags & LAGG_F_HASHL2)
	sc->sc_flags \|= MBUF_HASHFLAG_L2;
	if (rf->rf_flags & LAGG_F_HASHL3)
	sc->sc_flags \|= MBUF_HASHFLAG_L3;
	if (rf->rf_flags & LAGG_F_HASHL4)
	sc->sc_flags \|= MBUF_HASHFLAG_L4;
	LAGG_WUNLOCK(sc);
	break;
	case SIOCGLAGGPORT:
	if (rp->rp_portname[0] == '\0' \|\|
	(tpif = ifunit(rp->rp_portname)) == NULL) {
	error = EINVAL;
	break;
	}

	LAGG_RLOCK(sc, &tracker);
	if ((lp = (struct lagg_port *)tpif->if_lagg) == NULL \|\|
	lp->lp_softc != sc) {
	error = ENOENT;
	LAGG_RUNLOCK(sc, &tracker);
	break;
	}

	lagg_port2req(lp, rp);
	LAGG_RUNLOCK(sc, &tracker);
	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;
	}
	#ifdef INET6
	/*
	* A laggport interface should not have inet6 address
	* because two interfaces with a valid link-local
	* scope zone must not be merged in any form. This
	* restriction is needed to prevent violation of
	* link-local scope zone. Attempts to add a laggport
	* interface which has inet6 addresses triggers
	* removal of all inet6 addresses on the member
	* interface.
	*/
	if (in6ifa_llaonifp(tpif)) {
	in6_ifdetach(tpif);
	if_printf(sc->sc_ifp,
	"IPv6 addresses on %s have been removed "
	"before adding it as a member to prevent "
	"IPv6 address scope violation.\n",
	tpif->if_xname);
	}
	#endif
	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 */
	+ /* Do not allow the CAPs to be directly changed. */
	error = EINVAL;
	break;
	+ case SIOCSIFMTU:
	+ error = lagg_change_mtu(ifp, ifr);
	+ 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;
	int error;

	LAGG_WLOCK_ASSERT(sc);

	if (set) {
	IF_ADDR_WLOCK(scifp);
	TAILQ_FOREACH(ifma, &scifp->if_multiaddrs, ifma_link) {
	if (ifma->ifma_addr->sa_family != AF_LINK)
	continue;
	mc = malloc(sizeof(struct lagg_mc), M_DEVBUF, M_NOWAIT);
	if (mc == NULL) {
	IF_ADDR_WUNLOCK(scifp);
	return (ENOMEM);
	}
	bcopy(ifma->ifma_addr, &mc->mc_addr,
	ifma->ifma_addr->sa_len);
	mc->mc_addr.sdl_index = ifp->if_index;
	mc->mc_ifma = NULL;
	SLIST_INSERT_HEAD(&lp->lp_mc_head, mc, mc_entries);
	}
	IF_ADDR_WUNLOCK(scifp);
	SLIST_FOREACH (mc, &lp->lp_mc_head, mc_entries) {
	error = if_addmulti(ifp,
	(struct sockaddr *)&mc->mc_addr, &mc->mc_ifma);
	if (error)
	return (error);
	}
	} else {
	while ((mc = SLIST_FIRST(&lp->lp_mc_head)) != NULL) {
	SLIST_REMOVE(&lp->lp_mc_head, mc, lagg_mc, mc_entries);
	if (mc->mc_ifma && !lp->lp_detaching)
	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 int
	lagg_transmit(struct ifnet ifp, struct mbuf m)
	{
	struct lagg_softc sc = (struct lagg_softc )ifp->if_softc;
	int error, len, mcast;
	struct rm_priotracker tracker;

	len = m->m_pkthdr.len;
	mcast = (m->m_flags & (M_MCAST \| M_BCAST)) ? 1 : 0;

	LAGG_RLOCK(sc, &tracker);
	/* We need a Tx algorithm and at least one port */
	if (sc->sc_proto == LAGG_PROTO_NONE \|\| sc->sc_count == 0) {
	LAGG_RUNLOCK(sc, &tracker);
	m_freem(m);
	if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
	return (ENXIO);
	}

	ETHER_BPF_MTAP(ifp, m);

	error = lagg_proto_start(sc, m);
	LAGG_RUNLOCK(sc, &tracker);

	if (error != 0)
	if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);

	return (error);
	}

	/*
	* The ifp->if_qflush entry point for lagg(4) is no-op.
	*/
	static void
	lagg_qflush(struct ifnet *ifp __unused)
	{
	}

	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;
	struct rm_priotracker tracker;

	LAGG_RLOCK(sc, &tracker);
	if ((scifp->if_drv_flags & IFF_DRV_RUNNING) == 0 \|\|
	(lp->lp_flags & LAGG_PORT_DISABLED) \|\|
	sc->sc_proto == LAGG_PROTO_NONE) {
	LAGG_RUNLOCK(sc, &tracker);
	m_freem(m);
	return (NULL);
	}

	ETHER_BPF_MTAP(scifp, m);

	if (lp->lp_detaching != 0) {
	m_freem(m);
	m = NULL;
	} else
	m = lagg_proto_input(sc, lp, m);

	if (m != NULL) {
	if (scifp->if_flags & IFF_MONITOR) {
	m_freem(m);
	m = NULL;
	}
	}

	LAGG_RUNLOCK(sc, &tracker);
	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;
	struct rm_priotracker tracker;

	imr->ifm_status = IFM_AVALID;
	imr->ifm_active = IFM_ETHER \| IFM_AUTO;

	LAGG_RLOCK(sc, &tracker);
	SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
	if (LAGG_PORTACTIVE(lp))
	imr->ifm_status \|= IFM_ACTIVE;
	}
	LAGG_RUNLOCK(sc, &tracker);
	}

	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_ifp->if_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_BROADCAST:
	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);
	lagg_proto_linkstate(sc, 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);
	}

	int
	lagg_enqueue(struct ifnet ifp, struct mbuf m)
	{

	return (ifp->if_transmit)(ifp, m);
	}

	/*
	* Simple round robin aggregation
	*/
	static void
	lagg_rr_attach(struct lagg_softc *sc)
	{
	sc->sc_capabilities = IFCAP_LAGG_FULLDUPLEX;
	sc->sc_seq = 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 (ENETDOWN);
	}

	/* 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);
	}

	/*
	* Broadcast mode
	*/
	static int
	lagg_bcast_start(struct lagg_softc sc, struct mbuf m)
	{
	int active_ports = 0;
	int errors = 0;
	int ret;
	struct lagg_port lp, last = NULL;
	struct mbuf *m0;

	SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
	if (!LAGG_PORTACTIVE(lp))
	continue;

	active_ports++;

	if (last != NULL) {
	m0 = m_copym(m, 0, M_COPYALL, M_NOWAIT);
	if (m0 == NULL) {
	ret = ENOBUFS;
	errors++;
	break;
	}

	ret = lagg_enqueue(last->lp_ifp, m0);
	if (ret != 0)
	errors++;
	}
	last = lp;
	}
	if (last == NULL) {
	m_freem(m);
	return (ENOENT);
	}
	if ((last = lagg_link_active(sc, last)) == NULL) {
	m_freem(m);
	return (ENETDOWN);
	}

	ret = lagg_enqueue(last->lp_ifp, m);
	if (ret != 0)
	errors++;

	if (errors == 0)
	return (ret);

	return (0);
	}

	static struct mbuf*
	lagg_bcast_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_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 (ENETDOWN);
	}

	/* 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 \|\| V_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 void
	lagg_lb_attach(struct lagg_softc *sc)
	{
	struct lagg_port *lp;
	struct lagg_lb *lb;

	lb = malloc(sizeof(struct lagg_lb), M_DEVBUF, M_WAITOK \| M_ZERO);

	sc->sc_capabilities = IFCAP_LAGG_FULLDUPLEX;

	lb->lb_key = m_ether_tcpip_hash_init();
	sc->sc_psc = lb;

	SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
	lagg_lb_port_create(lp);
	}

	static void
	lagg_lb_detach(struct lagg_softc *sc)
	{
	struct lagg_lb *lb;

	lb = (struct lagg_lb *)sc->sc_psc;
	LAGG_WUNLOCK(sc);
	if (lb != NULL)
	free(lb, M_DEVBUF);
	}

	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_ifp->if_xname, 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 ((sc->sc_opts & LAGG_OPT_USE_FLOWID) &&
	M_HASHTYPE_GET(m) != M_HASHTYPE_NONE)
	p = m->m_pkthdr.flowid >> sc->flowid_shift;
	else
	p = m_ether_tcpip_hash(sc->sc_flags, 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 (ENETDOWN);
	}

	/* 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 void
	lagg_lacp_attach(struct lagg_softc *sc)
	{
	struct lagg_port *lp;

	lacp_attach(sc);
	SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
	lacp_port_create(lp);
	}

	static void
	lagg_lacp_detach(struct lagg_softc *sc)
	{
	struct lagg_port *lp;
	void *psc;

	SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
	lacp_port_destroy(lp);

	psc = sc->sc_psc;
	sc->sc_psc = NULL;
	LAGG_WUNLOCK(sc);

	lacp_detach(psc);
	}

	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 (ENETDOWN);
	}

	/* 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 ((m->m_flags & M_VLANTAG) == 0 && 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);
	}

	Index: sys/net/if_lagg.h
	===================================================================
	--- sys/net/if_lagg.h (revision 292047)
	+++ sys/net/if_lagg.h (working copy)
	@@ -1,292 +1,331 @@
	/* $OpenBSD: if_trunk.h,v 1.11 2007/01/31 06:20:19 reyk Exp $ */

	/*
	* Copyright (c) 2005, 2006 Reyk Floeter <reyk@openbsd.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.
	*
	* $FreeBSD$
	*/

	#ifndef _NET_LAGG_H
	#define _NET_LAGG_H

	/*
	* Global definitions
	*/

	#define LAGG_MAX_PORTS 32 /* logically */
	#define LAGG_MAX_NAMESIZE 32 /* name of a protocol */
	#define LAGG_MAX_STACKING 4 /* maximum number of stacked laggs */

	/* Lagg flags */
	#define LAGG_F_HASHL2 0x00000001 /* hash layer 2 */
	#define LAGG_F_HASHL3 0x00000002 /* hash layer 3 */
	#define LAGG_F_HASHL4 0x00000004 /* hash layer 4 */
	#define LAGG_F_HASHMASK 0x00000007

	/* Port flags */
	#define LAGG_PORT_SLAVE 0x00000000 /* normal enslaved port */
	#define LAGG_PORT_MASTER 0x00000001 /* primary port */
	#define LAGG_PORT_STACK 0x00000002 /* stacked lagg port */
	#define LAGG_PORT_ACTIVE 0x00000004 /* port is active */
	#define LAGG_PORT_COLLECTING 0x00000008 /* port is receiving frames */
	#define LAGG_PORT_DISTRIBUTING 0x00000010 /* port is sending frames */
	#define LAGG_PORT_DISABLED 0x00000020 /* port is disabled */
	#define LAGG_PORT_BITS "\20\01MASTER\02STACK\03ACTIVE\04COLLECTING" \
	"\05DISTRIBUTING\06DISABLED"

	/* Supported lagg PROTOs */
	typedef enum {
	LAGG_PROTO_NONE = 0, /* no lagg protocol defined */
	LAGG_PROTO_ROUNDROBIN, /* simple round robin */
	LAGG_PROTO_FAILOVER, /* active failover */
	LAGG_PROTO_LOADBALANCE, /* loadbalance */
	LAGG_PROTO_LACP, /* 802.3ad lacp */
	LAGG_PROTO_BROADCAST, /* broadcast */
	LAGG_PROTO_MAX,
	} lagg_proto;

	struct lagg_protos {
	const char *lpr_name;
	lagg_proto lpr_proto;
	};

	#define LAGG_PROTO_DEFAULT LAGG_PROTO_FAILOVER
	#define LAGG_PROTOS { \
	{ "failover", LAGG_PROTO_FAILOVER }, \
	{ "lacp", LAGG_PROTO_LACP }, \
	{ "loadbalance", LAGG_PROTO_LOADBALANCE }, \
	{ "roundrobin", LAGG_PROTO_ROUNDROBIN }, \
	{ "broadcast", LAGG_PROTO_BROADCAST }, \
	{ "none", LAGG_PROTO_NONE }, \
	{ "default", LAGG_PROTO_DEFAULT } \
	}

	/*
	* lagg ioctls.
	*/

	/*
	* LACP current operational parameters structure.
	*/
	struct lacp_opreq {
	uint16_t actor_prio;
	uint8_t actor_mac[ETHER_ADDR_LEN];
	uint16_t actor_key;
	uint16_t actor_portprio;
	uint16_t actor_portno;
	uint8_t actor_state;
	uint16_t partner_prio;
	uint8_t partner_mac[ETHER_ADDR_LEN];
	uint16_t partner_key;
	uint16_t partner_portprio;
	uint16_t partner_portno;
	uint8_t partner_state;
	};

	/* lagg port settings */
	struct lagg_reqport {
	char rp_ifname[IFNAMSIZ]; /* name of the lagg */
	char rp_portname[IFNAMSIZ]; /* name of the port */
	u_int32_t rp_prio; /* port priority */
	u_int32_t rp_flags; /* port flags */
	union {
	struct lacp_opreq rpsc_lacp;
	} rp_psc;
	#define rp_lacpreq rp_psc.rpsc_lacp
	};

	#define SIOCGLAGGPORT _IOWR('i', 140, struct lagg_reqport)
	#define SIOCSLAGGPORT _IOW('i', 141, struct lagg_reqport)
	#define SIOCSLAGGDELPORT _IOW('i', 142, struct lagg_reqport)

	/* lagg, ports and options */
	struct lagg_reqall {
	char ra_ifname[IFNAMSIZ]; /* name of the lagg */
	u_int ra_proto; /* lagg protocol */

	size_t ra_size; /* size of buffer */
	struct lagg_reqport ra_port; / allocated buffer */
	int ra_ports; /* total port count */
	union {
	struct lacp_opreq rpsc_lacp;
	} ra_psc;
	#define ra_lacpreq ra_psc.rpsc_lacp
	};

	#define SIOCGLAGG _IOWR('i', 143, struct lagg_reqall)
	#define SIOCSLAGG _IOW('i', 144, struct lagg_reqall)

	struct lagg_reqflags {
	char rf_ifname[IFNAMSIZ]; /* name of the lagg */
	uint32_t rf_flags; /* lagg protocol */
	};

	#define SIOCGLAGGFLAGS _IOWR('i', 145, struct lagg_reqflags)
	#define SIOCSLAGGHASH _IOW('i', 146, struct lagg_reqflags)

	struct lagg_reqopts {
	char ro_ifname[IFNAMSIZ]; /* name of the lagg */

	int ro_opts; /* Option bitmap */
	#define LAGG_OPT_NONE 0x00
	#define LAGG_OPT_USE_FLOWID 0x01 /* enable use of flowid */
	/* Pseudo flags which are used in ro_opts but not stored into sc_opts. */
	#define LAGG_OPT_FLOWIDSHIFT 0x02 /* set flowid shift */
	#define LAGG_OPT_FLOWIDSHIFT_MASK 0x1f /* flowid is uint32_t */
	#define LAGG_OPT_LACP_STRICT 0x10 /* LACP strict mode */
	#define LAGG_OPT_LACP_TXTEST 0x20 /* LACP debug: txtest */
	#define LAGG_OPT_LACP_RXTEST 0x40 /* LACP debug: rxtest */
	#define LAGG_OPT_LACP_TIMEOUT 0x80 /* LACP timeout */
	u_int ro_count; /* number of ports */
	u_int ro_active; /* active port count */
	u_int ro_flapping; /* number of flapping */
	int ro_flowid_shift; /* shift the flowid */
	};

	#define SIOCGLAGGOPTS _IOWR('i', 152, struct lagg_reqopts)
	#define SIOCSLAGGOPTS _IOW('i', 153, struct lagg_reqopts)

	#define LAGG_OPT_BITS "\020\001USE_FLOWID\005LACP_STRICT" \
	"\006LACP_TXTEST\007LACP_RXTEST"

	#ifdef _KERNEL

	/*
	* Internal kernel part
	*/

	#define LAGG_PORTACTIVE(_tp) ( \
	((_tp)->lp_ifp->if_link_state == LINK_STATE_UP) && \
	((_tp)->lp_ifp->if_flags & IFF_UP) \
	)

	struct lagg_ifreq {
	union {
	struct ifreq ifreq;
	struct {
	char ifr_name[IFNAMSIZ];
	struct sockaddr_storage ifr_ss;
	} ifreq_storage;
	} ifreq;
	};

	#define sc_ifflags sc_ifp->if_flags /* flags */
	#define sc_ifname sc_ifp->if_xname /* name */
	#define sc_capabilities sc_ifp->if_capabilities /* capabilities */

	#define IFCAP_LAGG_MASK 0xffff0000 /* private capabilities */
	#define IFCAP_LAGG_FULLDUPLEX 0x00010000 /* full duplex with >1 ports */

	/* Private data used by the loadbalancing protocol */
	struct lagg_lb {
	u_int32_t lb_key;
	struct lagg_port *lb_ports[LAGG_MAX_PORTS];
	};

	struct lagg_mc {
	struct sockaddr_dl mc_addr;
	struct ifmultiaddr *mc_ifma;
	SLIST_ENTRY(lagg_mc) mc_entries;
	};

	typedef enum {
	LAGG_LLQTYPE_PHYS = 0, /* Task related to physical (underlying) port */
	LAGG_LLQTYPE_VIRT, /* Task related to lagg interface itself */
	} lagg_llqtype;

	-/* List of interfaces to have the MAC address modified */
	-struct lagg_llq {
	+/* Adding new entry here, SHOULD also have relevant entry in llq_action */
	+typedef enum {
	+ LAGG_LLQ_MIN = 0,
	+ LAGG_LLQ_LLADDR = LAGG_LLQ_MIN, /* MAC Address index */
	+ LAGG_LLQ_MTU, /* MTU index */
	+ LAGG_LLQ_MAX /* This SHOULD be the last entry */
	+} lagg_llq_idx;
	+
	+/* Common list entry definition for each taskq operation */
	+struct lagg_llq_slist_entry {
	+ SLIST_ENTRY(lagg_llq_slist_entry) llq_entries;
	+};
	+
	+/* Context for lladdr llq operation part of lagg soft context */
	+struct lagg_lladdr_llq_ctxt {
	+ struct lagg_llq_slist_entry llq_cmn; /* This SHOULD be the first
	+ member */
	struct ifnet *llq_ifp;
	uint8_t llq_lladdr[ETHER_ADDR_LEN];
	lagg_llqtype llq_type;
	- SLIST_ENTRY(lagg_llq) llq_entries;
	+};
	+
	+/* Context for mtu llq operation part of lagg soft context */
	+struct lagg_mtu_llq_ctxt {
	+ struct lagg_llq_slist_entry llq_cmn; /* This SHOULD be the first
	+ member */
	+ struct ifnet *llq_ifp;
	+ struct ifreq llq_ifr;
	+ uint32_t llq_old_mtu;
	+ int (llq_ioctl)(struct ifnet , u_long, caddr_t);
	};

	struct lagg_counters {
	uint64_t val[IFCOUNTERS];
	};

	+/* Conditional variables context for lagg operations */
	+struct lagg_signal {
	+ struct mtx lock;
	+ struct cv cv;
	+};
	+
	+/* Lagg MTU context */
	+struct lagg_mtu_ctxt {
	+ struct lagg_signal mtu_sync; /* Synchronize for command completion */
	+ int mtu_cmd_ret;
	+ bool busy;
	+};
	+
	struct lagg_softc {
	struct ifnet sc_ifp; / virtual interface */
	struct rmlock sc_mtx;
	int sc_proto; /* lagg protocol */
	u_int sc_count; /* number of ports */
	u_int sc_active; /* active port count */
	u_int sc_flapping; /* number of flapping
	* events */
	struct lagg_port sc_primary; / primary port */
	struct ifmedia sc_media; /* media config */
	void sc_psc; / protocol data */
	uint32_t sc_seq; /* sequence counter */
	uint32_t sc_flags;

	SLIST_HEAD(__tplhd, lagg_port) sc_ports; /* list of interfaces */
	SLIST_ENTRY(lagg_softc) sc_entries;

	- struct task sc_lladdr_task;
	- SLIST_HEAD(__llqhd, lagg_llq) sc_llq_head; /* interfaces to program
	- the lladdr on */
	+ struct task sc_llq_task; /* SYNC & ASYNC ops enqueued here */
	+ struct lagg_mtu_ctxt sc_mtu_ctxt; /* MTU programming */
	+ /* List of LLQs */
	+ SLIST_HEAD(__llqhd, lagg_llq_slist_entry) sc_llq[LAGG_LLQ_MAX];
	+
	eventhandler_tag vlan_attach;
	eventhandler_tag vlan_detach;
	struct callout sc_callout;
	u_int sc_opts;
	int flowid_shift; /* shift the flowid */
	struct lagg_counters detached_counters; /* detached ports sum */
	};

	struct lagg_port {
	struct ifnet lp_ifp; / physical interface */
	struct lagg_softc lp_softc; / parent lagg */
	uint8_t lp_lladdr[ETHER_ADDR_LEN];

	u_char lp_iftype; /* interface type */
	uint32_t lp_prio; /* port priority */
	uint32_t lp_flags; /* port flags */
	int lp_ifflags; /* saved ifp flags */
	void lh_cookie; / if state hook */
	void lp_psc; / protocol data */
	int lp_detaching; /* ifnet is detaching */

	SLIST_HEAD(__mclhd, lagg_mc) lp_mc_head; /* multicast addresses */

	/* Redirected callbacks */
	int (lp_ioctl)(struct ifnet , u_long, caddr_t);
	int (lp_output)(struct ifnet , struct mbuf *,
	const struct sockaddr , struct route );
	struct lagg_counters port_counters; /* ifp counters copy */

	SLIST_ENTRY(lagg_port) lp_entries;
	};

	#define LAGG_LOCK_INIT(_sc) rm_init(&(_sc)->sc_mtx, "if_lagg rmlock")
	#define LAGG_LOCK_DESTROY(_sc) rm_destroy(&(_sc)->sc_mtx)
	#define LAGG_RLOCK(_sc, _p) rm_rlock(&(_sc)->sc_mtx, (_p))
	#define LAGG_WLOCK(_sc) rm_wlock(&(_sc)->sc_mtx)
	#define LAGG_RUNLOCK(_sc, _p) rm_runlock(&(_sc)->sc_mtx, (_p))
	#define LAGG_WUNLOCK(_sc) rm_wunlock(&(_sc)->sc_mtx)
	#define LAGG_RLOCK_ASSERT(_sc) rm_assert(&(_sc)->sc_mtx, RA_RLOCKED)
	#define LAGG_WLOCK_ASSERT(_sc) rm_assert(&(_sc)->sc_mtx, RA_WLOCKED)
	#define LAGG_UNLOCK_ASSERT(_sc) rm_assert(&(_sc)->sc_mtx, RA_UNLOCKED)

	extern struct mbuf (lagg_input_p)(struct ifnet , struct mbuf );
	extern void (lagg_linkstate_p)(struct ifnet , int );

	int lagg_enqueue(struct ifnet , struct mbuf );

	SYSCTL_DECL(_net_link_lagg);

	#endif /* _KERNEL */

	#endif /* _NET_LAGG_H */

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