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contiki/core/net/rime/collect-neighbor.c

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/**
* \addtogroup rimecollect_neighbor
* @{
*/
/*
* Copyright (c) 2006, Swedish Institute of Computer Science.
* 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.
* 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.
*
* This file is part of the Contiki operating system.
*
* $Id: collect-neighbor.c,v 1.6 2010/09/22 22:04:55 adamdunkels Exp $
*/
/**
* \file
* Radio neighborhood management
* \author
* Adam Dunkels <adam@sics.se>
*/
#include <limits.h>
#include <stdio.h>
#include "contiki.h"
#include "lib/memb.h"
#include "lib/list.h"
#include "net/rime/collect-neighbor.h"
#include "net/rime/collect.h"
#ifdef COLLECT_NEIGHBOR_CONF_MAX_COLLECT_NEIGHBORS
#define MAX_COLLECT_NEIGHBORS COLLECT_NEIGHBOR_CONF_MAX_COLLECT_NEIGHBORS
#else /* COLLECT_NEIGHBOR_CONF_MAX_COLLECT_NEIGHBORS */
#define MAX_COLLECT_NEIGHBORS 8
#endif /* COLLECT_NEIGHBOR_CONF_MAX_COLLECT_NEIGHBORS */
#define RTMETRIC_MAX COLLECT_MAX_DEPTH
MEMB(collect_neighbors_mem, struct collect_neighbor, MAX_COLLECT_NEIGHBORS);
static int max_time = 2400;
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
/*---------------------------------------------------------------------------*/
static void
periodic(void *ptr)
{
struct collect_neighbor_list *neighbor_list;
struct collect_neighbor *n, *next;
neighbor_list = ptr;
/* Go through all collect_neighbors and remove old ones. */
for(n = list_head(neighbor_list->list); n != NULL; n = next) {
next = NULL;
if(!rimeaddr_cmp(&n->addr, &rimeaddr_null) &&
n->time < max_time) {
n->time++;
if(n->time == max_time) {
n->rtmetric = RTMETRIC_MAX;
PRINTF("%d.%d: removing old collect_neighbor %d.%d\n",
rimeaddr_node_addr.u8[0],rimeaddr_node_addr.u8[1],
n->addr.u8[0], n->addr.u8[1]);
rimeaddr_copy(&n->addr, &rimeaddr_null);
next = list_item_next(n);
list_remove(neighbor_list->list, n);
memb_free(&collect_neighbors_mem, n);
}
}
if(next == NULL) {
next = list_item_next(n);
}
}
ctimer_set(&neighbor_list->periodic, CLOCK_SECOND, periodic, neighbor_list);
}
/*---------------------------------------------------------------------------*/
void
collect_neighbor_init(void)
{
static uint8_t initialized = 0;
if(initialized == 0) {
initialized = 1;
memb_init(&collect_neighbors_mem);
}
}
/*---------------------------------------------------------------------------*/
void
collect_neighbor_list_new(struct collect_neighbor_list *neighbors_list)
{
LIST_STRUCT_INIT(neighbors_list, list);
list_init(neighbors_list->list);
ctimer_set(&neighbors_list->periodic, CLOCK_SECOND, periodic, neighbors_list);
}
/*---------------------------------------------------------------------------*/
struct collect_neighbor *
collect_neighbor_list_find(struct collect_neighbor_list *neighbors_list,
const rimeaddr_t *addr)
{
struct collect_neighbor *n;
for(n = list_head(neighbors_list->list); n != NULL; n = list_item_next(n)) {
if(rimeaddr_cmp(&n->addr, addr)) {
return n;
}
}
return NULL;
}
/*---------------------------------------------------------------------------*/
void
collect_neighbor_list_add(struct collect_neighbor_list *neighbors_list,
const rimeaddr_t *addr, uint8_t nrtmetric)
{
uint16_t rtmetric;
uint16_t le;
struct collect_neighbor *n, *max;
PRINTF("collect_neighbor_add: adding %d.%d\n", addr->u8[0], addr->u8[1]);
/* Check if the collect_neighbor is already on the list. */
for(n = list_head(neighbors_list->list); n != NULL; n = list_item_next(n)) {
if(rimeaddr_cmp(&n->addr, &rimeaddr_null) ||
rimeaddr_cmp(&n->addr, addr)) {
PRINTF("collect_neighbor_add: already on list %d.%d\n",
addr->u8[0], addr->u8[1]);
break;
}
}
/* If the collect_neighbor was not on the list, we try to allocate memory
for it. */
if(n == NULL) {
PRINTF("collect_neighbor_add: not on list, allocating %d.%d\n",
addr->u8[0], addr->u8[1]);
n = memb_alloc(&collect_neighbors_mem);
if(n != NULL) {
list_add(neighbors_list->list, n);
}
}
/* If we could not allocate memory, we try to recycle an old
collect_neighbor */
if(n == NULL) {
PRINTF("collect_neighbor_add: not on list, not allocated, recycling %d.%d\n",
addr->u8[0], addr->u8[1]);
/* Find the first unused entry or the used entry with the highest
rtmetric and highest link estimate. */
rtmetric = 0;
le = 0;
max = NULL;
for(n = list_head(neighbors_list->list); n != NULL; n = list_item_next(n)) {
if(!rimeaddr_cmp(&n->addr, &rimeaddr_null)) {
if(n->rtmetric > rtmetric) {
rtmetric = n->rtmetric;
le = collect_neighbor_link_estimate(n);
max = n;
} else if(n->rtmetric == rtmetric) {
if(collect_neighbor_link_estimate(n) > le) {
rtmetric = n->rtmetric;
le = collect_neighbor_link_estimate(n);
max = n;
/* PRINTF("%d: found worst collect_neighbor %d with rtmetric %d, signal %d\n",
node_id, collect_neighbors[n].nodeid, rtmetric, signal);*/
}
}
}
}
n = max;
}
/* PRINTF("%d: adding collect_neighbor %d with rtmetric %d, signal %d at %d\n",
node_id, collect_neighbors[n].nodeid, rtmetric, signal, n);*/
if(n != NULL) {
n->time = 0;
rimeaddr_copy(&n->addr, addr);
n->rtmetric = nrtmetric;
collect_link_estimate_new(&n->le);
}
}
/*---------------------------------------------------------------------------*/
void
collect_neighbor_list_remove(struct collect_neighbor_list *neighbors_list,
const rimeaddr_t *addr)
{
struct collect_neighbor *n;
for(n = list_head(neighbors_list->list); n != NULL; n = list_item_next(n)) {
if(rimeaddr_cmp(&n->addr, addr)) {
PRINTF("%d.%d: removing %d.%d\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
addr->u8[0], addr->u8[1]);
rimeaddr_copy(&n->addr, &rimeaddr_null);
n->rtmetric = RTMETRIC_MAX;
list_remove(neighbors_list->list, n);
memb_free(&collect_neighbors_mem, n);
return;
}
}
}
/*---------------------------------------------------------------------------*/
struct collect_neighbor *
collect_neighbor_list_best(struct collect_neighbor_list *neighbors_list)
{
int found;
struct collect_neighbor *n, *best;
uint16_t rtmetric;
rtmetric = RTMETRIC_MAX;
best = NULL;
found = 0;
/* PRINTF("%d: ", node_id);*/
PRINTF("collect_neighbor_best: ");
/* Find the lowest rtmetric. */
for(n = list_head(neighbors_list->list); n != NULL; n = list_item_next(n)) {
PRINTF("%d.%d %d+%d=%d, ",
n->addr.u8[0], n->addr.u8[1],
n->rtmetric, collect_neighbor_link_estimate(n),
collect_neighbor_rtmetric(n));
if(!rimeaddr_cmp(&n->addr, &rimeaddr_null) &&
rtmetric > collect_neighbor_rtmetric_link_estimate(n)) {
rtmetric = collect_neighbor_rtmetric_link_estimate(n);
best = n;
}
}
PRINTF("\n");
return best;
}
/*---------------------------------------------------------------------------*/
int
collect_neighbor_list_num(struct collect_neighbor_list *neighbors_list)
{
PRINTF("collect_neighbor_num %d\n", list_length(neighbors_list->list));
return list_length(neighbors_list->list);
}
/*---------------------------------------------------------------------------*/
struct collect_neighbor *
collect_neighbor_list_get(struct collect_neighbor_list *neighbors_list, int num)
{
int i;
struct collect_neighbor *n;
PRINTF("collect_neighbor_get %d\n", num);
i = 0;
for(n = list_head(neighbors_list->list); n != NULL; n = list_item_next(n)) {
if(i == num) {
PRINTF("collect_neighbor_get found %d.%d\n",
n->addr.u8[0], n->addr.u8[1]);
return n;
}
i++;
}
return NULL;
}
/*---------------------------------------------------------------------------*/
void
collect_neighbor_list_purge(struct collect_neighbor_list *neighbors_list)
{
while(list_head(neighbors_list->list) != NULL) {
memb_free(&collect_neighbors_mem, list_pop(neighbors_list->list));
}
}
/*---------------------------------------------------------------------------*/
void
collect_neighbor_update_rtmetric(struct collect_neighbor *n, uint8_t rtmetric)
{
if(n != NULL) {
PRINTF("%d.%d: collect_neighbor_update %d.%d rtmetric %d\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
n->addr.u8[0], n->addr.u8[1], rtmetric);
n->rtmetric = rtmetric;
n->time = 0;
}
}
/*---------------------------------------------------------------------------*/
void
collect_neighbor_tx_fail(struct collect_neighbor *n, uint8_t num_tx)
{
collect_link_estimate_update_tx_fail(&n->le, num_tx);
}
/*---------------------------------------------------------------------------*/
void
collect_neighbor_tx(struct collect_neighbor *n, uint8_t num_tx)
{
collect_link_estimate_update_tx(&n->le, num_tx);
n->time = 0;
}
/*---------------------------------------------------------------------------*/
void
collect_neighbor_rx(struct collect_neighbor *n)
{
collect_link_estimate_update_rx(&n->le);
n->time = 0;
}
/*---------------------------------------------------------------------------*/
int
collect_neighbor_link_estimate(struct collect_neighbor *n)
{
return collect_link_estimate(&n->le);
}
/*---------------------------------------------------------------------------*/
int
collect_neighbor_rtmetric_link_estimate(struct collect_neighbor *n)
{
return n->rtmetric + collect_link_estimate(&n->le);
}
/*---------------------------------------------------------------------------*/
int
collect_neighbor_rtmetric(struct collect_neighbor *n)
{
return n->rtmetric;
}
/*---------------------------------------------------------------------------*/
void
collect_neighbor_set_lifetime(int seconds)
{
max_time = seconds;
}
/*---------------------------------------------------------------------------*/
/** @} */
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