/*      $NetBSD: ieee8023ad_lacp_sm_rx.c,v 1.5 2021/11/30 01:17:02 yamaguchi Exp $      */

/*-
* Copyright (c)2005 YAMAMOTO Takashi,
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ieee8023ad_lacp_sm_rx.c,v 1.5 2021/11/30 01:17:02 yamaguchi Exp $");

#include <sys/param.h>
#include <sys/callout.h>
#include <sys/mbuf.h>
#include <sys/systm.h>

#include <net/if.h>
#include <net/if_ether.h>
#include <net/ether_slowprotocols.h>

#include <net/agr/ieee8023_tlv.h>
#include <net/agr/ieee8023ad_lacp.h>
#include <net/agr/ieee8023ad_lacp_impl.h>
#include <net/agr/ieee8023ad_lacp_sm.h>
#include <net/agr/ieee8023ad_lacp_debug.h>

/* receive machine */

static void lacp_sm_rx_update_ntt(struct lacp_port *, const struct lacpdu *);
static void lacp_sm_rx_record_pdu(struct lacp_port *, const struct lacpdu *);
static void lacp_sm_rx_update_selected(struct lacp_port *, const struct lacpdu *);

static void lacp_sm_rx_record_default(struct lacp_port *);
static void lacp_sm_rx_update_default_selected(struct lacp_port *);

static void lacp_sm_rx_update_selected_from_peerinfo(struct lacp_port *,
   const struct lacp_peerinfo *);

/*
* partner administration variables.
* XXX should be configurable.
*/

static const struct lacp_peerinfo lacp_partner_admin = {
       .lip_systemid = { .lsi_prio = 0xffff },
       .lip_portid = { .lpi_prio = 0xffff },
#if 1
       /* optimistic */
       .lip_state = LACP_STATE_SYNC | LACP_STATE_AGGREGATION |
           LACP_STATE_COLLECTING | LACP_STATE_DISTRIBUTING,
#else
       /* pessimistic */
       .lip_state = 0,
#endif
};

void
lacp_sm_rx(struct lacp_port *lp, const struct lacpdu *du)
{
       int timeout;

       /*
        * check LACP_DISABLED first
        */

       if (!(lp->lp_state & LACP_STATE_AGGREGATION)) {
               return;
       }

       /*
        * check loopback condition.
        */

       if (!lacp_compare_systemid(&du->ldu_actor.lip_systemid,
           &lp->lp_actor.lip_systemid)) {
               return;
       }

       /*
        * EXPIRED, DEFAULTED, CURRENT -> CURRENT
        */

       lacp_sm_rx_update_selected(lp, du);
       lacp_sm_rx_update_ntt(lp, du);
       lacp_sm_rx_record_pdu(lp, du);

       timeout = (lp->lp_state & LACP_STATE_TIMEOUT) ?
           LACP_SHORT_TIMEOUT_TIME : LACP_LONG_TIMEOUT_TIME;
       LACP_TIMER_ARM(lp, LACP_TIMER_CURRENT_WHILE, timeout);

       lp->lp_state &= ~LACP_STATE_EXPIRED;

       /*
        * kick transmit machine without waiting the next tick.
        */

       lacp_sm_tx(lp);
}

void
lacp_sm_rx_set_expired(struct lacp_port *lp)
{

       lp->lp_partner.lip_state &= ~LACP_STATE_SYNC;
       lp->lp_partner.lip_state |= LACP_STATE_TIMEOUT;
       LACP_TIMER_ARM(lp, LACP_TIMER_CURRENT_WHILE, LACP_SHORT_TIMEOUT_TIME);
       lp->lp_state |= LACP_STATE_EXPIRED;
}

void
lacp_sm_rx_timer(struct lacp_port *lp)
{

       if ((lp->lp_state & LACP_STATE_EXPIRED) == 0) {
               /* CURRENT -> EXPIRED */
               LACP_DPRINTF((lp, "%s: CURRENT -> EXPIRED\n", __func__));
               lacp_sm_rx_set_expired(lp);
       } else {
               /* EXPIRED -> DEFAULTED */
               LACP_DPRINTF((lp, "%s: EXPIRED -> DEFAULTED\n", __func__));
               lacp_sm_rx_update_default_selected(lp);
               lacp_sm_rx_record_default(lp);
               lp->lp_state &= ~LACP_STATE_EXPIRED;
       }
}

static void
lacp_sm_rx_record_pdu(struct lacp_port *lp, const struct lacpdu *du)
{
       bool active;
       uint8_t oldpstate;
#if defined(LACP_DEBUG)
       char buf[LACP_STATESTR_MAX+1];
#endif

       /* LACP_DPRINTF((lp, "%s\n", __func__)); */

       oldpstate = lp->lp_partner.lip_state;

       active = (du->ldu_actor.lip_state & LACP_STATE_ACTIVITY)
           || ((lp->lp_state & LACP_STATE_ACTIVITY) &&
           (du->ldu_partner.lip_state & LACP_STATE_ACTIVITY));

       lp->lp_partner = du->ldu_actor;
       if (active &&
           ((LACP_STATE_EQ(lp->lp_state, du->ldu_partner.lip_state,
           LACP_STATE_AGGREGATION) &&
           !lacp_compare_peerinfo(&lp->lp_actor, &du->ldu_partner))
           || (du->ldu_partner.lip_state & LACP_STATE_AGGREGATION) == 0)) {
               /* nothing */
       } else {
               lp->lp_partner.lip_state &= ~LACP_STATE_SYNC;
       }

       lp->lp_state &= ~LACP_STATE_DEFAULTED;

       LACP_DPRINTF((lp, "old pstate %s\n",
           lacp_format_state(oldpstate, buf, sizeof(buf))));
       LACP_DPRINTF((lp, "new pstate %s\n",
           lacp_format_state(lp->lp_partner.lip_state, buf, sizeof(buf))));

       lacp_sm_ptx_update_timeout(lp, oldpstate);
}

static void
lacp_sm_rx_update_ntt(struct lacp_port *lp, const struct lacpdu *du)
{

       /* LACP_DPRINTF((lp, "%s\n", __func__)); */

       if (lacp_compare_peerinfo(&lp->lp_actor, &du->ldu_partner) ||
           !LACP_STATE_EQ(lp->lp_state, du->ldu_partner.lip_state,
           LACP_STATE_ACTIVITY | LACP_STATE_SYNC | LACP_STATE_AGGREGATION)) {
               LACP_DPRINTF((lp, "%s: assert ntt\n", __func__));
               lacp_sm_assert_ntt(lp);
       }
}

static void
lacp_sm_rx_record_default(struct lacp_port *lp)
{
       uint8_t oldpstate;

       /* LACP_DPRINTF((lp, "%s\n", __func__)); */

       oldpstate = lp->lp_partner.lip_state;
       lp->lp_partner = lacp_partner_admin;
       lp->lp_state |= LACP_STATE_DEFAULTED;
       lacp_sm_ptx_update_timeout(lp, oldpstate);
}

static void
lacp_sm_rx_update_selected_from_peerinfo(struct lacp_port *lp,
   const struct lacp_peerinfo *info)
{

       /* LACP_DPRINTF((lp, "%s\n", __func__)); */

       if (lacp_compare_peerinfo(&lp->lp_partner, info) ||
           !LACP_STATE_EQ(lp->lp_partner.lip_state, info->lip_state,
           LACP_STATE_AGGREGATION)) {
               lp->lp_selected = LACP_UNSELECTED;
               /* mux machine will clean up lp->lp_aggregator */
       }
}

static void
lacp_sm_rx_update_selected(struct lacp_port *lp, const struct lacpdu *du)
{

       /* LACP_DPRINTF((lp, "%s\n", __func__)); */

       lacp_sm_rx_update_selected_from_peerinfo(lp, &du->ldu_actor);
}

static void
lacp_sm_rx_update_default_selected(struct lacp_port *lp)
{

       /* LACP_DPRINTF((lp, "%s\n", __func__)); */

       lacp_sm_rx_update_selected_from_peerinfo(lp, &lacp_partner_admin);
}

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