Remove only the worst parent if the table is full when processing a DIO.
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432928d000
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1 changed files with 20 additions and 5 deletions
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@ -52,7 +52,7 @@
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#include <limits.h>
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#include <limits.h>
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#include <string.h>
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#include <string.h>
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#define DEBUG DEBUG_NONE
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#define DEBUG DEBUG_PRINT
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#include "net/uip-debug.h"
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#include "net/uip-debug.h"
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#include "net/neighbor-info.h"
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#include "net/neighbor-info.h"
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@ -119,6 +119,22 @@ remove_parents(rpl_dag_t *dag, rpl_rank_t minimum_rank)
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}
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}
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}
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}
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/************************************************************************/
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/************************************************************************/
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static void
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remove_worst_parent(rpl_dag_t *dag)
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{
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rpl_parent_t *p, *worst;
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PRINTF("RPL: Removing the worst parent\n");
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worst = NULL;
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for(p = list_head(dag->parents); p != NULL; p = p->next) {
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if(worst == NULL || p->rank > worst->rank) {
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worst = p;
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}
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}
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rpl_remove_parent(dag, worst);
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}
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/************************************************************************/
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static int
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static int
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should_send_dao(rpl_dag_t *dag, rpl_dio_t *dio, rpl_parent_t *p)
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should_send_dao(rpl_dag_t *dag, rpl_dio_t *dio, rpl_parent_t *p)
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{
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{
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@ -679,11 +695,10 @@ rpl_process_dio(uip_ipaddr_t *from, rpl_dio_t *dio)
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*/
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*/
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p = rpl_find_parent(dag, from);
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p = rpl_find_parent(dag, from);
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if(p == NULL &&
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if(p == NULL) {
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DAG_RANK(dio->rank, dag) <= DAG_RANK(dag->preferred_parent->rank, dag)) {
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if(RPL_PARENT_COUNT(dag) == RPL_MAX_PARENTS) {
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if(RPL_PARENT_COUNT(dag) == RPL_MAX_PARENTS) {
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/* Try to make room for a new parent. */
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/* Make room for a new parent. */
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remove_parents(dag, dag->preferred_parent->rank + dag->min_hoprankinc);
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remove_worst_parent(dag);
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}
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}
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/* Add the DIO sender as a candidate parent. */
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/* Add the DIO sender as a candidate parent. */
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