/****************************************************************************
* net/neighbor/neighbor_periodic.c
*
* Copyright (C) 2007-2009, 2015 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* A leverage of logic from uIP which also has a BSD style license
*
* Copyright (c) 2006, Swedish Institute of Computer Science. All rights
* reserved.
* Author: Adam Dunkels <adam@sics.se>
*
* 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 the Institute 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 THE INSTITUTE 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 INSTITUTE 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/clock.h>
#include "neighbor/neighbor.h"
/****************************************************************************
* Public Functions
****************************************************************************/
#define USEC_PER_HSEC 500000
#define TICK_PER_HSEC (USEC_PER_HSEC / USEC_PER_TICK) /* Truncates! */
#define TICK2HSEC(tick) (((tick)+(TICK_PER_HSEC/2))/TICK_PER_HSEC) /* Rounds */
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: neighbor_periodic
*
* Description:
* Called from the timer poll logic in order to perform agin operations on
* entries in the Neighbor Table
*
* Input Parameters:
* None
*
* Returned Value:
* None
*
****************************************************************************/
void neighbor_periodic(void)
{
uint32_t now;
uint32_t ticks;
uint32_t hsecs;
int i;
/* Get the elapsed time in units of half seconds */
now = clock_systimer();
ticks = now - g_neighbor_polltime;
hsecs = TICK2HSEC(ticks);
/* Reset the time of the last poll */
g_neighbor_polltime = now;
/* Add the elapsed half seconds from each activate entry in the
* Neighbor table.
*/
for (i = 0; i < CONFIG_NET_IPv6_NCONF_ENTRIES; ++i)
{
uint32_t newtime = g_neighbors[i].ne_time + hsecs;
if (newtime > NEIGHBOR_MAXTIME)
{
newtime = NEIGHBOR_MAXTIME;
}
g_neighbors[i].ne_time = newtime;
}
}
