/*      $OpenBSD: if_trunk.c,v 1.30 2007/01/31 06:20:19 reyk Exp $
 *      $FreeBSD: head/sys/net/if_lagg.c 256218 2013-10-09 19:04:40Z glebius $
 */
/*
 * 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>

#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/caps.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/hash.h>
#include <sys/lock.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_llc.h>
#include <net/if_media.h>
#include <net/if_types.h>
#include <net/if_var.h>
#include <net/ifq_var.h>
#include <net/bpf.h>

#include <net/netmsg2.h>
#include <net/netisr2.h>

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

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

#include <net/vlan/if_vlan_var.h>
#include <net/lagg/if_lagg.h>
#include <net/lagg/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(, lagg_softc) lagg_list;     /* list of laggs */
static struct lock      lagg_list_lock;
eventhandler_tag        lagg_detach_cookie = NULL;

static int      lagg_clone_create(struct if_clone *, int, caddr_t, caddr_t);
static int      lagg_clone_destroy(struct ifnet *);
static const char *    laggname = "lagg";
struct if_clone lagg_cloner = IF_CLONE_INITIALIZER("lagg",
                                lagg_clone_create,
                                lagg_clone_destroy,
                                0, IF_MAXUNIT);

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 void     lagg_input(struct ifnet *, struct mbuf *);
static void     lagg_linkstate(struct lagg_softc *);
#if 0 /* XXX */
static void     lagg_port_state(struct ifnet *, int);
#endif
static int      lagg_port_ioctl(struct ifnet *, u_long, caddr_t, struct ucred *cr);
static int      lagg_port_output(struct ifnet *, struct mbuf *,
                    struct sockaddr *, struct rtentry *);
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, struct ucred *cr);
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 *, struct ifaltq_subque *ifsq);
static void     lagg_start_dispatch(netmsg_t msg);
/* Not needed?
static int      lagg_output(struct ifnet *ifp, struct mbuf *m);
*/
#if 0 /* XXX */
static int      lagg_transmit(struct ifnet *, struct mbuf *);
static void     lagg_qflush(struct ifnet *);
#endif
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 *);
static int      lagg_sysctl_active(SYSCTL_HANDLER_ARGS);

/* Simple round robin */
static int      lagg_rr_attach(struct lagg_softc *);
static int      lagg_rr_detach(struct lagg_softc *);
static struct ifnet *lagg_rr_select_tx_port(struct lagg_softc *sc,
                    struct mbuf *m);
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 struct ifnet *lagg_fail_select_tx_port(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 struct ifnet *lagg_lb_select_tx_port(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 struct ifnet *lagg_lacp_select_tx_port(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 *);

static void     lagg_callout(void *);

/* 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 def_use_flowid = 1; /* Default value for using M_FLOWID */
TUNABLE_INT("net.link.lagg.default_use_flowid", &def_use_flowid);
SYSCTL_INT(_net_link_lagg, OID_AUTO, default_use_flowid, CTLFLAG_RW,
    &def_use_flowid, 0,
    "Default setting for using flow id for load sharing");

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

        switch (type) {
        case MOD_LOAD:
                lockinit(&lagg_list_lock, "if_lagg list", 0, 0);
                SLIST_INIT(&lagg_list);
                if_clone_attach(&lagg_cloner);
                lagg_input_p = lagg_input;
                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;
                if_clone_detach(&lagg_cloner);
                lockuninit(&lagg_list_lock);
                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);

/*
 * This routine is run via an vlan
 * config EVENT
 */
static void
lagg_register_vlan(void *arg, struct ifnet *ifp, u_int16_t vtag)
{
#if 0 /* XXX */
        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);
        }
        LAGG_RUNLOCK(sc);
#endif

}

/*
 * 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)) {
#if 0 /* XXX */
                SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
                        EVENTHANDLER_INVOKE(vlan_unconfig, lp->lp_ifp);
#endif
        }
        LAGG_RUNLOCK(sc);
}

static int
lagg_clone_create(struct if_clone *ifc, int unit,
                  caddr_t params __unused, caddr_t data __unused)
{
        struct lagg_softc *sc;
        struct ifnet *ifp;
        int i, error = 0;
        static const u_char eaddr[6];   /* 00:00:00:00:00:00 */
        struct sysctl_oid *oid;
        char num[14];                   /* sufficient for 32 bits */

        sc = kmalloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO);
        ifp = sc->sc_ifp = &sc->sc_if; // XXX  if_alloc(IFT_ETHER);
/*
        if (ifp == NULL) {
                kfree(sc, M_DEVBUF);
                return (ENOSPC);
        }
*/
/*
        sc->sc_ipackets = counter_u64_alloc(M_WAITOK);
        sc->sc_opackets = counter_u64_alloc(M_WAITOK);
        sc->sc_ibytes = counter_u64_alloc(M_WAITOK);
        sc->sc_obytes = counter_u64_alloc(M_WAITOK);
*/
        sysctl_ctx_init(&sc->ctx);
        ksnprintf(num, sizeof(num), "%u", unit);
        sc->use_flowid = def_use_flowid;
        sc->sc_oid = oid = SYSCTL_ADD_NODE(&sc->ctx,
                &SYSCTL_NODE_CHILDREN(_net_link, lagg),
                OID_AUTO, num, CTLFLAG_RD, NULL, "");
        SYSCTL_ADD_INT(&sc->ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
                "use_flowid", CTLTYPE_INT|CTLFLAG_RW, &sc->use_flowid, sc->use_flowid,
                "Use flow id for load sharing");
        SYSCTL_ADD_INT(&sc->ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
                "count", CTLTYPE_INT|CTLFLAG_RD, &sc->sc_count, sc->sc_count,
                "Total number of ports");
        SYSCTL_ADD_PROC(&sc->ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
                "active", CTLTYPE_INT|CTLFLAG_RD, sc, 0, lagg_sysctl_active,
                "I", "Total number of active ports");
        SYSCTL_ADD_INT(&sc->ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
                "flapping", CTLTYPE_INT|CTLFLAG_RD, &sc->sc_flapping,
                sc->sc_flapping, "Total number of port change events");
        /* Hash all layers by default */
        sc->sc_flags = LAGG_F_HASHL2|LAGG_F_HASHL3|LAGG_F_HASHL4;

        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(ifp);
                                kfree(sc, M_DEVBUF);
                                return (error);
                        }
                        break;
                }
        }
        LAGG_LOCK_INIT(sc);
        LAGG_CALLOUT_LOCK_INIT(sc);
        SLIST_INIT(&sc->sc_ports);
        TASK_INIT(&sc->sc_lladdr_task, 0, lagg_port_setlladdr, sc);

        /*
         * This uses the callout lock rather than the rmlock; one can't
         * hold said rmlock during SWI.
         */
        callout_init_lk(&sc->sc_callout, &sc->sc_call_lock);

        /* 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;
#if 0 /* XXX */
        ifp->if_transmit = lagg_transmit;
        ifp->if_qflush = lagg_qflush;
#endif
        ifp->if_mtu = ETHERMTU;
        ifp->if_init = lagg_init;
        ifp->if_ioctl = lagg_ioctl;
        ifp->if_flags = IFF_SIMPLEX | IFF_BROADCAST | IFF_MULTICAST;
        ifp->if_start = lagg_start; 
        ifp->if_type = IFT_ETHER;
        ifq_set_maxlen(&ifp->if_snd, ifqmaxlen);
        ifq_set_ready(&ifp->if_snd);
        ifp->if_hdrlen = ETHER_HDR_LEN;

#if 0 /* XXX */
        ifp->if_capenable = ifp->if_capabilities = IFCAP_HWSTATS;
#endif
        /*
         * Attach as an ordinary ethernet device, children will be attached
         * as special device IFT_IEEE8023ADLAG.
         */

        ether_ifattach(ifp, eaddr, NULL);

        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 */
        lockmgr(&lagg_list_lock, LK_EXCLUSIVE);
        SLIST_INSERT_HEAD(&lagg_list, sc, sc_entries);
        lockmgr(&lagg_list_lock, LK_RELEASE);

        callout_reset(&sc->sc_callout, hz, lagg_callout, sc);

        return (0);
}

static int
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 */
        if (sc->sc_detach != NULL)
                (*sc->sc_detach)(sc);

        LAGG_WUNLOCK(sc);

        sysctl_ctx_free(&sc->ctx);
        ifmedia_removeall(&sc->sc_media);
        ether_ifdetach(ifp);
        /* This ifp is part of lagg_softc, don't free it! */
        /* if_free(ifp); */

        /* This grabs sc_callout_mtx, serialising it correctly */
        callout_drain(&sc->sc_callout);

#if 0
        /* At this point it's drained; we can free this */
        counter_u64_free(sc->sc_ipackets);
        counter_u64_free(sc->sc_opackets);
        counter_u64_free(sc->sc_ibytes);
        counter_u64_free(sc->sc_obytes);
#endif

        lockmgr(&lagg_list_lock, LK_EXCLUSIVE);
        SLIST_REMOVE(&lagg_list, sc, lagg_softc, sc_entries);
        lockmgr(&lagg_list_lock, LK_RELEASE);

        taskqueue_drain(taskqueue_swi, &sc->sc_lladdr_task);
        LAGG_LOCK_DESTROY(sc);
        LAGG_CALLOUT_LOCK_DESTROY(sc);
        kfree(sc, M_DEVBUF);

        return 0;
}

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 = kmalloc(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 */
                /* CURVNET_SET(ifp->if_vnet); */
                error = if_setlladdr(ifp, llq->llq_lladdr, ETHER_ADDR_LEN);
                /* CURVNET_RESTORE(); */
                if (error)
                        kprintf("%s: setlladdr failed on %s\n", __func__,
                            ifp->if_xname);

                head = SLIST_NEXT(llq, llq_entries);
                kfree(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) {
                /* 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)
                return (EPROTONOSUPPORT);

#ifdef INET6
        /*
         * The member 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 member interface which has inet6 addresses triggers
         * removal of all inet6 addresses on the member interface.
         */
        SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
                if (in6ifa_llaonifp(lp->lp_ifp)) {
                        in6_ifdetach(lp->lp_ifp);
                        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",
                            lp->lp_ifp->if_xname);
                }
        }
        if (in6ifa_llaonifp(ifp)) {
                in6_ifdetach(ifp);
                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",
                    ifp->if_xname);
        }
#endif
        /* 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 = kmalloc(sizeof(struct lagg_port),
            M_DEVBUF, M_NOWAIT|M_ZERO)) == NULL)
                return (ENOMEM);

        /* Check if port is a stacked lagg */
        lockmgr(&lagg_list_lock, LK_EXCLUSIVE);
        SLIST_FOREACH(sc_ptr, &lagg_list, sc_entries) {
                if (ifp == sc_ptr->sc_ifp) {
                        lockmgr(&lagg_list_lock, LK_RELEASE);
                        kfree(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) {
                                lockmgr(&lagg_list_lock, LK_RELEASE);
                                kfree(lp, M_DEVBUF);
                                return (E2BIG);
                        }
#endif
                }
        }
        lockmgr(&lagg_list_lock, LK_RELEASE);

        /* 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);
}

#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 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);
                                kfree(llq, M_DEVBUF);
                                break;  /* Only appears once */
                        }
                }
        }

        if (lp->lp_ifflags)
                if_printf(ifp, "%s: lp_ifflags unclean\n", __func__);

        kfree(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 ucred *cr)
{
        struct lagg_reqport *rp = (struct lagg_reqport *)data;
        struct lagg_softc *sc;
        struct lagg_port *lp = NULL;
        int error = 0;

        ASSERT_IFNET_SERIALIZED_ALL(ifp);

        /* 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') {
                        error = EINVAL;
                        break;
                }

                /*
                 * Release ifp serializers before ifnet_lock
                 * to prevent lock order reversal.
                 */
                ifnet_deserialize_all(ifp);
                ifnet_lock();
                if (ifunit(rp->rp_portname) != ifp) {
                        ifnet_unlock();
                        ifnet_serialize_all(ifp);
                        error = EINVAL;
                        break;
                }
                ifnet_unlock();
                ifnet_serialize_all(ifp);

                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, cr);
                if (error)
                        break;

                /* Update lagg interface capabilities */
                LAGG_WLOCK(sc);
                lagg_capabilities(sc);
                LAGG_WUNLOCK(sc);
                break;
        case SIOCGIFMEDIA:
                if (lp->lp_ioctl == NULL) {
                        error = EINVAL;
                        break;
                }

                error = (*lp->lp_ioctl)(ifp, cmd, data, cr);
                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) {
                int result;
                result = ((*lp->lp_ioctl)(ifp, cmd, data, cr));
        }
        return (EINVAL);
}

/*
 * For direct output to child ports.
 */
static int
lagg_port_output(struct ifnet *ifp, struct mbuf *m,
        struct sockaddr *dst, struct rtentry *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 0 /* XXX */
        /* If the ifnet is just being renamed, don't do anything. */
        if (ifp->if_flags & IFF_RENAMING)
                return;
#endif
        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_flags & IFF_RUNNING)
                return;

        LAGG_WLOCK(sc);

        ifp->if_flags |= IFF_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_flags & IFF_RUNNING) == 0)
                return;

        ifp->if_flags &= ~IFF_RUNNING;

        if (sc->sc_stop != NULL)
                (*sc->sc_stop)(sc);
}

static int
lagg_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr)
{
        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 lagg_reqflags *rf = (struct lagg_reqflags *)data;
        struct ifreq *ifr = (struct ifreq *)data;
        struct lagg_port *lp;
        struct ifnet *tpif;
        char *buf, *outbuf;
        int count, buflen, len, error = 0;

        ASSERT_IFNET_SERIALIZED_ALL(ifp);

        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 = kmalloc(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);
                kfree(outbuf, M_TEMP);
                break;
        case SIOCSLAGG:
                error = caps_priv_check_self(SYSCAP_NONET_LAGG);
                if (error)
                        break;
                if (ra->ra_proto >= LAGG_PROTO_MAX) {
                        error = EPROTONOSUPPORT;
                        break;
                }
                LAGG_WLOCK(sc);
                if (sc->sc_proto != LAGG_PROTO_NONE) {
                        /* Reset protocol first in case detach unlocks */
                        sc->sc_proto = LAGG_PROTO_NONE;
                        error = sc->sc_detach(sc);
                        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;
                } else if (sc->sc_input != NULL) {
                        /* Still detaching */
                        error = EBUSY;
                }
                if (error != 0) {
                        LAGG_WUNLOCK(sc);
                        break;
                }
                for (int i = 0; i < (NELEM(lagg_protos)); i++) {
                        if (lagg_protos[i].ti_proto == ra->ra_proto) {
                                if (sc->sc_ifflags & IFF_DEBUG)
                                        kprintf("%s: using proto %u\n",
                                            sc->sc_ifname,
                                            lagg_protos[i].ti_proto);
                                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);
                        }
                }
                LAGG_WUNLOCK(sc);
                error = EPROTONOSUPPORT;
                break;
        case SIOCGLAGGFLAGS:
                rf->rf_flags = sc->sc_flags;
                break;
        case SIOCSLAGGHASH:
                error = caps_priv_check_self(SYSCAP_NONET_LAGG);
                if (error)
                        break;
                if ((rf->rf_flags & LAGG_F_HASHMASK) == 0) {
                        error = EINVAL;
                        break;
                }
                LAGG_WLOCK(sc);
                sc->sc_flags &= ~LAGG_F_HASHMASK;
                sc->sc_flags |= rf->rf_flags & LAGG_F_HASHMASK;
                LAGG_WUNLOCK(sc);
                break;
        case SIOCGLAGGPORT:
                /*
                 * Release ifp serializers before ifnet_lock
                 * to prevent lock order reversal.
                 */
                ifnet_deserialize_all(ifp);
                ifnet_lock();
                if (rp->rp_portname[0] == '\0' ||
                    (tpif = ifunit(rp->rp_portname)) == NULL) {
                        ifnet_unlock();
                        ifnet_serialize_all(ifp);
                        error = EINVAL;
                        break;
                }

                LAGG_RLOCK(sc);
                if ((lp = (struct lagg_port *)tpif->if_lagg) == NULL ||
                    lp->lp_softc != sc) {
                        error = ENOENT;
                        LAGG_RUNLOCK(sc);
                        ifnet_unlock();
                        ifnet_serialize_all(ifp);
                        break;
                }

                lagg_port2req(lp, rp);
                LAGG_RUNLOCK(sc);
                ifnet_unlock();
                ifnet_serialize_all(ifp);
                break;
        case SIOCSLAGGPORT:
                error = caps_priv_check_self(SYSCAP_NONET_LAGG);
                if (error)
                        break;
                /*
                 * Release ifp serializers before ifnet_lock
                 * to prevent lock order reversal.
                 */
                ifnet_deserialize_all(ifp);
                ifnet_lock();
                if (rp->rp_portname[0] == '\0' ||
                    (tpif = ifunit(rp->rp_portname)) == NULL) {
                        ifnet_unlock();
                        ifnet_serialize_all(ifp);
                        error = EINVAL;
                        break;
                }
                LAGG_WLOCK(sc);
                error = lagg_port_create(sc, tpif);
                LAGG_WUNLOCK(sc);
                ifnet_unlock();
                ifnet_serialize_all(ifp);
                break;
        case SIOCSLAGGDELPORT:
                error = caps_priv_check_self(SYSCAP_NONET_LAGG);
                if (error)
                        break;
                /*
                 * Release ifp serializers before ifnet_lock
                 * to prevent lock order reversal.
                 */
                ifnet_deserialize_all(ifp);
                ifnet_lock();
                if (rp->rp_portname[0] == '\0' ||
                    (tpif = ifunit(rp->rp_portname)) == NULL) {
                        ifnet_unlock();
                        ifnet_serialize_all(ifp);
                        error = EINVAL;
                        break;
                }

                LAGG_WLOCK(sc);
                if ((lp = (struct lagg_port *)tpif->if_lagg) == NULL ||
                    lp->lp_softc != sc) {
                        error = ENOENT;
                        LAGG_WUNLOCK(sc);
                        ifnet_unlock();
                        ifnet_serialize_all(ifp);
                        break;
                }

                error = lagg_port_destroy(lp, 1);
                LAGG_WUNLOCK(sc);
                ifnet_unlock();
                ifnet_serialize_all(ifp);
                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_flags & IFF_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_flags & IFF_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;

        ASSERT_IFNET_NOT_SERIALIZED_ALL(ifp);
        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 = kmalloc(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(ifp, (struct sockaddr *)mc->mc_ifma);
                        kfree(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);
        ASSERT_IFNET_NOT_SERIALIZED_ALL(ifp);

        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;

        ASSERT_IFNET_NOT_SERIALIZED_ALL(lp->lp_ifp);

        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);
}


#if 0 /* XXX not needed? */
static int
lagg_output(struct ifnet *ifp, struct mbuf *m)
{
        struct lagg_softc *sc = ifp->if_softc;
        int error, len, mcast;

        len = m->m_pkthdr.len;
        mcast = (m->m_flags & (M_MCAST | M_BCAST)) ? 1 : 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) {
                LAGG_RUNLOCK(sc);
                m_freem(m);
                ifp->if_oerrors++;
                return (ENXIO);
        }

        BPF_MTAP(ifp, m);

        error = (*sc->sc_start)(sc, m);
        LAGG_RUNLOCK(sc);

        if (error == 0) {
                IFNET_STAT_INC(ifp, opackets, 1);
                IFNET_STAT_INC(ifp, obytes, len);
                ifp->if_omcasts += mcast;
        } else
                ifp->if_oerrors++;

        return error;
}
#endif

#if 0 /* XXX */
/*
 * The ifp->if_qflush entry point for lagg(4) is no-op.
 */
static void
lagg_qflush(struct ifnet *ifp __unused)
{
}
#endif
static void
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;
        
        LAGG_RLOCK(sc);
        if ((scifp->if_flags & IFF_RUNNING) == 0 ||
            (lp->lp_flags & LAGG_PORT_DISABLED) ||
            sc->sc_proto == LAGG_PROTO_NONE) {
                LAGG_RUNLOCK(sc);
                m_freem(m);
                return;
        }

        BPF_MTAP(scifp, m);
        m = (*sc->sc_input)(sc, lp, m);
        
        LAGG_RUNLOCK(sc);

        if (m != NULL) {
                IFNET_STAT_INC(ifp, ipackets, 1);
                IFNET_STAT_INC(ifp, ibytes, m->m_pkthdr.len);

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

static int
lagg_media_change(struct ifnet *ifp)
{
        struct lagg_softc *sc = (struct lagg_softc *)ifp->if_softc;

        if (sc->sc_ifflags & IFF_DEBUG)
                kprintf("%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);

        /* 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;
        }
}

#if 0 /* XXX */
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);
}
#endif

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);
}

static int
lagg_sysctl_active(SYSCTL_HANDLER_ARGS)
{
        struct lagg_softc *sc = (struct lagg_softc *)arg1;
        struct lagg_port *lp;
        int error;

        /* LACP tracks active links automatically, the others do not */
        if (sc->sc_proto != LAGG_PROTO_LACP) {
                sc->sc_active = 0;
                SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
                        sc->sc_active += LAGG_PORTACTIVE(lp);
        }

        error = sysctl_handle_int(oidp, &sc->sc_active, 0, req);
        if ((error) || (req->newptr == NULL))
                return (error);

        return (0);
}

uint32_t
lagg_hashmbuf(struct lagg_softc *sc, struct mbuf *m, uint32_t key)
{
        uint16_t etype;
        uint32_t p = key;
        int off;
        struct ether_header *eh;
        const struct ether_vlan_header *vlan;
#ifdef INET
        const struct ip *ip;
        const uint32_t *ports;
        int iphlen;
#endif
#ifdef INET6
        const struct ip6_hdr *ip6;
        uint32_t flow;
#endif
        union {
#ifdef INET
                struct ip ip;
#endif
#ifdef INET6
                struct ip6_hdr ip6;
#endif
                struct ether_vlan_header vlan;
                uint32_t port;
        } buf;


        off = sizeof(*eh);
        if (m->m_len < off)
                goto out;
        eh = mtod(m, struct ether_header *);
        etype = ntohs(eh->ether_type);
        if (sc->sc_flags & LAGG_F_HASHL2) {
                p = hash32_buf(&eh->ether_shost, ETHER_ADDR_LEN, p);
                p = hash32_buf(&eh->ether_dhost, ETHER_ADDR_LEN, p);
        }

        /* Special handling for encapsulating VLAN frames */
#if 0 /* XXX */
        if ((m->m_flags & M_VLANTAG) && (sc->sc_flags & LAGG_F_HASHL2)) {
                p = hash32_buf(&m->m_pkthdr.ether_vtag,
                    sizeof(m->m_pkthdr.ether_vtag), p);
        } else 
#endif
        if (etype == ETHERTYPE_VLAN) {
                vlan = lagg_gethdr(m, off,  sizeof(*vlan), &buf);
                if (vlan == NULL)
                        goto out;

                if (sc->sc_flags & LAGG_F_HASHL2)
                        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), &buf);
                if (ip == NULL)
                        goto out;

                if (sc->sc_flags & LAGG_F_HASHL3) {
                        p = hash32_buf(&ip->ip_src, sizeof(struct in_addr), p);
                        p = hash32_buf(&ip->ip_dst, sizeof(struct in_addr), p);
                }
                if (!(sc->sc_flags & LAGG_F_HASHL4))
                        break;
                switch (ip->ip_p) {
                        case IPPROTO_TCP:
                        case IPPROTO_UDP:
                                iphlen = ip->ip_hl << 2;
                                if (iphlen < sizeof(*ip))
                                        break;
                                off += iphlen;
                                ports = lagg_gethdr(m, off, sizeof(*ports), &buf);
                                if (ports == NULL)
                                        break;
                                p = hash32_buf(ports, sizeof(*ports), p);
                                break;
                }
                break;
#endif
#ifdef INET6
        case ETHERTYPE_IPV6:
                if (!(sc->sc_flags & LAGG_F_HASHL3))
                        break;
                ip6 = lagg_gethdr(m, off, sizeof(*ip6), &buf);
                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);
}

static void
lagg_start(struct ifnet *ifp, struct ifaltq_subque *ifsq)
{
        struct lagg_softc *sc = ifp->if_softc;
        struct mbuf *m;
        struct ifnet *ifp_p; 
        struct netmsg_packet *nmp;
        lwkt_port_t p_port;

        ASSERT_ALTQ_SQ_DEFAULT(ifp, ifsq);
        ASSERT_ALTQ_SQ_SERIALIZED_HW(ifsq);

        if (((ifp->if_flags & IFF_RUNNING) == 0)
            || (sc->sc_proto == LAGG_PROTO_NONE)
            || (sc->sc_count == 0)) {
                ifsq_purge(ifsq);
                return;
        }

        
        LAGG_RLOCK(sc);
        for (;;) {
                m = ifsq_dequeue(ifsq);
                if (m == NULL){
                        break;
                }
                // Choose output port
                ifp_p = (*sc->sc_select_tx_port)(sc, m);
                
                if (ifp_p == NULL) {
                        ifsq_purge(ifsq);
                        break;
                }       
                p_port = netisr_cpuport(
                    ifsq_get_cpuid(ifq_get_subq_default(&ifp_p->if_snd)));

                BPF_MTAP(ifp, m);

                nmp = &m->m_hdr.mh_netmsg;

                netmsg_init(&nmp->base, NULL, &netisr_apanic_rport,
                            0, lagg_start_dispatch);
                nmp->nm_packet = m;
                nmp->base.lmsg.u.ms_resultp = ifp_p;

                lwkt_sendmsg(p_port, &nmp->base.lmsg);
                IFNET_STAT_INC(ifp, opackets, 1);
        }       
        LAGG_RUNLOCK(sc);
}


static void
lagg_start_dispatch(netmsg_t msg)
{
        struct netmsg_packet *nmp = &msg->packet;
        struct mbuf *m;
        struct ifnet *ifp;
        struct altq_pktattr pktattr;

        m = nmp->nm_packet;
        ifp = msg->lmsg.u.ms_resultp;

        M_ASSERTPKTHDR(m);

        /* Does altq mix with lacp? */
        if (ifq_is_enabled(&ifp->if_snd))
                altq_etherclassify(&ifp->if_snd, m, &pktattr);

        ifq_dispatch(ifp, m, &pktattr);
}


int
lagg_enqueue(struct ifnet *ifp, struct mbuf *m)
{
        struct altq_pktattr pktattr;
        
        if (ifq_is_enabled(&ifp->if_snd))
                altq_etherclassify(&ifp->if_snd, m, &pktattr);

        ifq_dispatch(ifp, m, &pktattr); 
        return 0;
}

/*
 * Simple round robin aggregation
 */
static int
lagg_rr_attach(struct lagg_softc *sc)
{
        sc->sc_detach = lagg_rr_detach;
        sc->sc_input = lagg_rr_input;
        sc->sc_select_tx_port = lagg_rr_select_tx_port;
        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 struct ifnet *
lagg_rr_select_tx_port(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) {
                return (NULL);
        }

        return (lp->lp_ifp);
}

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_select_tx_port = lagg_fail_select_tx_port;
        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);
}

struct ifnet *
lagg_fail_select_tx_port(struct lagg_softc *sc, struct mbuf *m)
{
        struct lagg_port *lp;

        if ((lp = lagg_link_active(sc, sc->sc_primary)) == NULL)
                return NULL;
        
        return lp->lp_ifp;
}

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 *)kmalloc(sizeof(struct lagg_lb),
            M_DEVBUF, M_NOWAIT|M_ZERO)) == NULL)
                return (ENOMEM);

        sc->sc_detach = lagg_lb_detach;
        sc->sc_select_tx_port = lagg_lb_select_tx_port;
        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 = karc4random();
        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)
                kfree(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)
                        kprintf("%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);
}


struct ifnet *
lagg_lb_select_tx_port(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;

        /* XXX
        if (sc->use_flowid && (m->m_flags & M_FLOWID))
                p = m->m_pkthdr.flowid;
        else
        */
        p = lagg_hashmbuf(sc, 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)
                return NULL;

        return lp->lp_ifp;
}

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_select_tx_port = lagg_lacp_select_tx_port;
        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);
}

struct ifnet *
lagg_lacp_select_tx_port(struct lagg_softc *sc, struct mbuf *m)
{
        struct lagg_port *lp;
        lp = lacp_select_tx_port(sc, m);
        if (lp == NULL)
                return NULL;

        return lp->lp_ifp;
}

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);
}

static void
lagg_callout(void *arg)
{
        struct lagg_softc *sc = (struct lagg_softc *)arg;
#if 0 /* XXX */
        struct ifnet *ifp = sc->sc_ifp;

        ifp->if_ipackets = counter_u64_fetch(sc->sc_ipackets);
        ifp->if_opackets = counter_u64_fetch(sc->sc_opackets);
        ifp->if_ibytes = counter_u64_fetch(sc->sc_ibytes);
        ifp->if_obytes = counter_u64_fetch(sc->sc_obytes);
#endif 

        callout_reset(&sc->sc_callout, hz, lagg_callout, sc);
}