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nuttx/net/mld/mld_timer.c

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/****************************************************************************
* net/mld/mld_timer.c
*
* Copyright (C) 2018 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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.
* 3. Neither the name of CITEL Technologies Ltd nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY CITEL TECHNOLOGIES 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 CITEL TECHNOLOGIES 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <nuttx/compiler.h>
#include <assert.h>
#include <debug.h>
#include <nuttx/wdog.h>
#include <nuttx/irq.h>
#include <nuttx/wqueue.h>
#include <nuttx/net/netconfig.h>
#include <nuttx/net/net.h>
#include <nuttx/net/netstats.h>
#include <nuttx/net/mld.h>
#include "devif/devif.h"
#include "mld/mld.h"
#include "utils/utils.h"
#ifdef CONFIG_NET_MLD
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Debug ********************************************************************/
#undef MLD_MTMRDEBUG /* Define to enable detailed MLD group debug */
#ifndef CONFIG_NET_MLD
# undef MLD_MTMRDEBUG
#endif
#ifdef CONFIG_CPP_HAVE_VARARGS
# ifdef MLD_MTMRDEBUG
# define mtmrerr(format, ...) nerr(format, ##__VA_ARGS__)
# define mtmrinfo(format, ...) ninfo(format, ##__VA_ARGS__)
# else
# define mtmrerr(x...)
# define mtmrinfo(x...)
# endif
#else
# ifdef MLD_MTMRDEBUG
# define mtmrerr nerr
# define mtmrinfo ninfo
# else
# define mtmrerr (void)
# define mtmrinfo (void)
# endif
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: mld_timeout_work
*
* Description:
* Timeout watchdog work
*
* Assumptions:
* This function is called from a work queue thread.
*
****************************************************************************/
static void mld_timeout_work(FAR void *arg)
{
FAR struct mld_group_s *group;
int ret;
/* Recover the reference to the group */
group = (FAR struct mld_group_s *)arg;
DEBUGASSERT(group != NULL);
/* Check if this a new join to the multicast group. */
net_lock();
if (IS_MLD_STARTUP(group->flags))
{
/* Schedule (and forget) the Report. */
MLD_STATINCR(g_netstats.mld.report_sched);
ret = mld_schedmsg(group, MLD_SEND_REPORT);
if (ret < 0)
{
nerr("ERROR: Failed to schedule message: %d\n", ret);
}
/* Send the report until the unsolicited report count goes to zero
* then terminate the start-up sequence.
*/
if (group->count > 1)
{
/* Decrement the count and restart the timer */
group->count--;
mld_starttimer(group, MSEC2TICK(MLD_UNSOLREPORT_MSEC));
}
else
{
/* Terminate the start-up sequence */
CLR_MLD_STARTUP(group->flags);
/* If in Querier mode, start the Querier timer */
if (IS_MLD_QUERIER(group->flags))
{
mld_starttimer(group, MSEC2TICK(MLD_QUERY_MSEC));
}
}
}
/* Check if this is querier */
else if (IS_MLD_QUERIER(group->flags))
{
/* Schedule (and forget) the general query. */
MLD_STATINCR(g_netstats.mld.query_sched);
ret = mld_schedmsg(group, MLD_SEND_GENQUERY);
if (ret < 0)
{
nerr("ERROR: Failed to schedule message: %d\n", ret);
}
/* Restart the Querier timer */
mld_starttimer(group, MSEC2TICK(MLD_QUERY_MSEC));
}
net_unlock();
}
/****************************************************************************
* Name: mld_timeout
*
* Description:
* Timeout watchdog handler.
*
* Assumptions:
* This function is called from the wdog timer handler which runs in the
* context of the timer interrupt handler.
*
****************************************************************************/
static void mld_timeout(int argc, uint32_t arg, ...)
{
FAR struct mld_group_s *group;
int ret;
ninfo("Timeout!\n");
/* Recover the reference to the group */
group = (FAR struct mld_group_s *)arg;
DEBUGASSERT(argc == 1 && group != NULL);
/* Perform the timeout-related operations on (preferably) the low priority
* work queue.
*/
ret = work_queue(LPWORK, &group->work, mld_timeout_work, group, 0);
if (ret < 0)
{
nerr("ERROR: Failed to queue timeout work: %d\n", ret);
}
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: mld_starttimer
*
* Description:
* Start the MLD timer.
*
* Assumptions:
* This function may be called from most any context.
*
****************************************************************************/
void mld_starttimer(FAR struct mld_group_s *group, clock_t ticks)
{
int ret;
/* Start the timer */
mtmrinfo("ticks: %ld\n", (unsigned long)ticks);
ret = wd_start(group->wdog, ticks, mld_timeout, 1, (uint32_t)group);
DEBUGASSERT(ret == OK);
UNUSED(ret);
}
/****************************************************************************
* Name: mld_cmptimer
*
* Description:
* Compare the timer remaining on the watching timer to the deci-second
* value. If maxticks > ticks-remaining, then (1) cancel the timer (to
* avoid race conditions) and return true.
*
* Assumptions:
* This function may be called from most any context. If true is returned
* then the caller must call mld_starttimer() to restart the timer
*
****************************************************************************/
bool mld_cmptimer(FAR struct mld_group_s *group, int maxticks)
{
irqstate_t flags;
int remaining;
/* Disable interrupts so that there is no race condition with the actual
* timer expiration.
*/
flags = enter_critical_section();
/* Get the timer remaining on the watchdog. A time of <= zero means that
* the watchdog was never started.
*/
remaining = wd_gettime(group->wdog);
/* A remaining time of zero means that the watchdog was never started
* or has already expired. That case should be covered in the following
* test as well.
*/
mtmrinfo("maxticks: %d remaining: %d\n", maxticks, remaining);
if (maxticks > remaining)
{
/* Cancel the watchdog timer and return true */
wd_cancel(group->wdog);
leave_critical_section(flags);
return true;
}
leave_critical_section(flags);
return false;
}
#endif /* CONFIG_NET_MLD */
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