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e000b1abf3
300 bytes, as well as cleaner protocol logic. * Made parent management uniform. * Simplified the DIO processing. * Improved the Objective Function API and its documentation. * Removed redundant code at various places. * Improved identifier naming. * Switched visualization from candidate parents to preferred parents only. * Made DAO ACK transmissions configurable. * Improved initial ETX guess by using a cached local confidence value. * Added a periodical rank recalculation function to reduce the maximum stack depth. * Increased the Trickle redundancy constant to ensure faster topological updates.
160 lines
4.3 KiB
C
160 lines
4.3 KiB
C
/**
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* \addtogroup uip6
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* @{
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*/
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/*
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* Copyright (c) 2010, Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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* $Id: rpl-of-etx.c,v 1.5 2010/06/14 12:44:37 nvt-se Exp $
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*/
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/**
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* \file
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* An implementation of RPL's objective function 1 (ETX).
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*
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* \author Joakim Eriksson <joakime@sics.se>, Nicolas Tsiftes <nvt@sics.se>
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*/
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#include "net/rpl/rpl.h"
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#define DEBUG DEBUG_ANNOTATE
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#include "net/uip-debug.h"
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static void reset(void *);
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static void parent_state_callback(rpl_parent_t *, int, int);
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static rpl_parent_t *best_parent(rpl_parent_t *, rpl_parent_t *);
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static rpl_rank_t calculate_rank(rpl_parent_t *, rpl_rank_t);
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rpl_of_t rpl_of_etx = {
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reset,
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parent_state_callback,
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best_parent,
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calculate_rank,
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1
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};
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#define LINK_ETX_MIN 1
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#define LINK_ETX_MAX 10
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#define LINK_ETX_GUESS (LINK_ETX_MAX - 1)
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#define PATH_ETX_MIN 1
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#define PATH_ETX_MAX 200
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#define PARENT_SWITCH_ETX_THRESHOLD 0.5
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typedef uint16_t etx_t;
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static etx_t min_path_etx = INFINITE_RANK;
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static void
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reset(void *dag)
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{
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min_path_etx = INFINITE_RANK;
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}
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static void
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parent_state_callback(rpl_parent_t *parent, int known, int etx)
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{
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rpl_dag_t *dag;
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dag = (rpl_dag_t *)parent->dag;
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if(!known) {
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if(RPL_PARENT_COUNT(dag) == 1) {
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/* Our last parent has disappeared, set the path ETX to INFINITE_RANK. */
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min_path_etx = INFINITE_RANK;
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}
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}
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}
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static rpl_rank_t
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calculate_rank(rpl_parent_t *p, rpl_rank_t base_rank)
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{
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rpl_dag_t *dag;
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rpl_rank_t new_rank;
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rpl_rank_t rank_increase;
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PRINTF("RPL: OF1 calculate rank\n");
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dag = (rpl_dag_t *)p->dag;
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rank_increase = p == NULL ? LINK_ETX_GUESS : p->local_confidence;
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rank_increase += dag->min_hoprankinc;
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if(base_rank == 0) {
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if(p == NULL) {
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return INFINITE_RANK;
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}
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base_rank = p->rank;
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}
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if(base_rank < min_path_etx) {
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min_path_etx = base_rank;
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PRINTF("RPL: min_path_etx updated to %u\n", min_path_etx);
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}
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if(INFINITE_RANK - base_rank < rank_increase) {
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/* Reached the maximum rank. */
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new_rank = INFINITE_RANK;
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} else {
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/* Calculate the rank based on the new rank information from DIO or
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stored otherwise. */
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new_rank = base_rank + rank_increase;
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}
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PRINTF("RPL: Path ETX %u\n", (unsigned)new_rank);
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return new_rank;
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}
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static rpl_parent_t *
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best_parent(rpl_parent_t *p1, rpl_parent_t *p2)
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{
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rpl_dag_t *dag;
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rpl_rank_t p1_rank;
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rpl_rank_t p2_rank;
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p1_rank = calculate_rank(p1, 0);
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p2_rank = calculate_rank(p2, 0);
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/* Maintain stability of the preferred parent in case of similar ranks. */
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if(p1_rank == p2_rank) {
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dag = (rpl_dag_t *)p1->dag;
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if(p1 == dag->preferred_parent) {
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return p1;
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} else if(p2 == dag->preferred_parent) {
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return p2;
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}
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}
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if(p1_rank < p2_rank) {
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return p1;
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}
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return p2;
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}
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