/*      $NetBSD: ieee8023ad_lacp_sm_ptx.c,v 1.4 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_ptx.c,v 1.4 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>

/* periodic transmit machine */

void
lacp_sm_ptx_update_timeout(struct lacp_port *lp, uint8_t oldpstate)
{

       if (LACP_STATE_EQ(oldpstate, lp->lp_partner.lip_state,
           LACP_STATE_TIMEOUT)) {
               return;
       }

       LACP_DPRINTF((lp, "partner timeout changed\n"));

       /*
        * FAST_PERIODIC -> SLOW_PERIODIC
        * or
        * SLOW_PERIODIC (-> PERIODIC_TX) -> FAST_PERIODIC
        *
        * let lacp_sm_ptx_tx_schedule to update timeout.
        */

       LACP_TIMER_DISARM(lp, LACP_TIMER_PERIODIC);

       /*
        * if timeout has been shortened, assert NTT.
        */

       if ((lp->lp_partner.lip_state & LACP_STATE_TIMEOUT)) {
               lacp_sm_assert_ntt(lp);
       }
}

void
lacp_sm_ptx_tx_schedule(struct lacp_port *lp)
{
       int timeout;

       if (!(lp->lp_state & LACP_STATE_ACTIVITY) &&
           !(lp->lp_partner.lip_state & LACP_STATE_ACTIVITY)) {

               /*
                * NO_PERIODIC
                */

               LACP_TIMER_DISARM(lp, LACP_TIMER_PERIODIC);
               return;
       }

       if (LACP_TIMER_ISARMED(lp, LACP_TIMER_PERIODIC)) {
               return;
       }

       timeout = (lp->lp_partner.lip_state & LACP_STATE_TIMEOUT) ?
           LACP_FAST_PERIODIC_TIME : LACP_SLOW_PERIODIC_TIME;

       LACP_TIMER_ARM(lp, LACP_TIMER_PERIODIC, timeout);
}

void
lacp_sm_ptx_timer(struct lacp_port *lp)
{

       lacp_sm_assert_ntt(lp);
}