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Rewrote proactive link estimator to be invoked randomly instead of triggered by an empty queue; this makes network bootups because nodes are not synchronized

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This commit is contained in:
adamdunkels 2010-10-28 15:36:02 +00:00
parent f9d5815e19
commit 677575fc8c
2 changed files with 66 additions and 46 deletions
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108
core/net/rime/collect.c
View File

@ -33,7 +33,7 @@
*
* This file is part of the Contiki operating system.
*
* $Id: collect.c,v 1.64 2010/10/25 12:25:39 adamdunkels Exp $
* $Id: collect.c,v 1.65 2010/10/28 15:36:02 adamdunkels Exp $
*/
/**
@ -154,12 +154,12 @@ MEMB(send_queue_memb, struct packetqueue_item, MAX_SENDING_QUEUE);
#define MAX_HOPLIM 15
/* Experimental mechanism: when there are no packets in the send
/* Proactive probing: when there are no packets in the send
queue, the system periodically sends a dummy packet to potential
parents, i.e., neighbors with a lower rtmetric than we have but for
which we do not yet have a link quality estimate. */
#define PROACTIVE_MAINTENANCE_INTERVAL CLOCK_SECOND * 30
#define PROACTIVE_MAINTENANCE_REXMITS 15
#define PROACTIVE_PROBING_INTERVAL (random_rand() % CLOCK_SECOND * 60)
#define PROACTIVE_PROBING_REXMITS 15
/* COLLECT_CONF_ANNOUNCEMENTS defines if the Collect implementation
should use Contiki's announcement primitive to announce its routes
@ -502,6 +502,55 @@ send_packet(struct collect_conn *c, struct collect_neighbor *n)
retransmit_not_sent_callback, c);
}
/*---------------------------------------------------------------------------*/
static void
proactive_probing_callback(void *ptr)
{
struct collect_conn *c = ptr;
struct packetqueue_item *i;
ctimer_set(&c->proactive_probing_timer, PROACTIVE_PROBING_INTERVAL,
proactive_probing_callback, ptr);
/* Only do proactive link probing if we are not the sink and if we
have a route. */
if(c->rtmetric != RTMETRIC_SINK && c->rtmetric != RTMETRIC_MAX) {
/* Grab the first packet on the send queue to see if the queue is
empty or not. */
i = packetqueue_first(&c->send_queue);
if(i == NULL) {
/* If there are no packets to send, we go through the list of
neighbors to find a potential parent for which we do not have a
link estimate and send a dummy packet to it. This allows us to
quickly gauge the link quality of neighbors that we do not
currently use as parents. */
struct collect_neighbor *n;
/* Find the neighbor with the lowest number of estimates. */
for(n = list_head(collect_neighbor_list(&c->neighbor_list));
n != NULL; n = list_item_next(n)) {
if(n->rtmetric + COLLECT_LINK_ESTIMATE_UNIT < c->rtmetric &&
collect_link_estimate_num_estimates(&n->le) == 0) {
rimeaddr_t current_parent;
PRINTF("proactive_probing_callback: found neighbor with no link estimate, %d.%d\n",
n->addr.u8[RIMEADDR_SIZE - 2], n->addr.u8[RIMEADDR_SIZE - 1]);
rimeaddr_copy(&current_parent, &c->parent);
rimeaddr_copy(&c->parent, &n->addr);
if(enqueue_dummy_packet(c, PROACTIVE_PROBING_REXMITS)) {
send_queued_packet(c);
}
rimeaddr_copy(&c->parent, &current_parent);
return;
}
}
}
PRINTF("%d.%d: nothing on queue\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1]);
return;
}
}
/*---------------------------------------------------------------------------*/
/**
* This function is called when a queued packet should be sent
* out. The function takes the first packet on the output queue, adds
@ -533,38 +582,6 @@ send_queued_packet(struct collect_conn *c)
PRINTF("%d.%d: nothing on queue\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1]);
/* If there are no packets to send, we go through the list of
neighbors to find a potential parent for which we do not have a
link estimate and send a dummy packet to it. This allows us to
quickly gauge the link quality of neighbors that we do not
currently use as parents. */
if(c->rtmetric != RTMETRIC_SINK &&
timer_expired(&c->proactive_maintenence_timer)) {
struct collect_neighbor *n;
timer_set(&c->proactive_maintenence_timer,
PROACTIVE_MAINTENANCE_INTERVAL);
/* Find the neighbor with the lowest number of estimates. */
for(n = list_head(collect_neighbor_list(&c->neighbor_list));
n != NULL; n = list_item_next(n)) {
if(n->rtmetric + COLLECT_LINK_ESTIMATE_UNIT < c->rtmetric &&
collect_link_estimate_num_estimates(&n->le) == 0) {
rimeaddr_t current_parent;
PRINTF("proactive maintenance: found neighbor with no link estimate, %d.%d\n",
n->addr.u8[0], n->addr.u8[1]);
rimeaddr_copy(&current_parent, &c->parent);
rimeaddr_copy(&c->parent, &n->addr);
if(enqueue_dummy_packet(c, PROACTIVE_MAINTENANCE_REXMITS)) {
send_queued_packet(c);
}
rimeaddr_copy(&c->parent, &current_parent);
return;
}
}
}
return;
}
@ -1024,8 +1041,8 @@ node_packet_received(struct unicast_conn *c, const rimeaddr_t *from)
} else {
send_ack(tc, &ack_to,
ackflags | ACK_FLAGS_DROPPED | ACK_FLAGS_CONGESTED);
printf("%d.%d: packet dropped: no queue buffer available\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1]);
/* printf("%d.%d: packet dropped: no queue buffer available\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1]);*/
stats.qdrop++;
}
} else if(packetbuf_attr(PACKETBUF_ATTR_TTL) <= 1) {
@ -1056,10 +1073,10 @@ static void
timedout(struct collect_conn *tc)
{
struct collect_neighbor *n;
printf("%d.%d: timedout after %d retransmissions to %d.%d (max retransmissions %d): packet dropped\n",
/* printf("%d.%d: timedout after %d retransmissions to %d.%d (max retransmissions %d): packet dropped\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1], tc->transmissions,
tc->current_parent.u8[0], tc->current_parent.u8[1],
tc->max_rexmits);
tc->max_rexmits);*/
tc->sending = 0;
n = collect_neighbor_list_find(&tc->neighbor_list,
@ -1270,6 +1287,9 @@ collect_open(struct collect_conn *tc, uint16_t channels,
announcement_set_value(&tc->announcement, RTMETRIC_MAX);
#endif /* COLLECT_CONF_WITH_LISTEN */
#endif /* !COLLECT_ANNOUNCEMENTS */
ctimer_set(&tc->proactive_probing_timer, PROACTIVE_PROBING_INTERVAL,
proactive_probing_callback, tc);
}
/*---------------------------------------------------------------------------*/
static void
@ -1413,8 +1433,8 @@ collect_send(struct collect_conn *tc, int rexmits)
send_queued_packet(tc);
return 1;
} else {
printf("%d.%d: drop originated packet: no queuebuf\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1]);
/* printf("%d.%d: drop originated packet: no queuebuf\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1]);*/
}
} else {
@ -1438,8 +1458,8 @@ collect_send(struct collect_conn *tc, int rexmits)
tc)) {
return 1;
} else {
printf("%d.%d: drop originated packet: no queuebuf\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1]);
/* printf("%d.%d: drop originated packet: no queuebuf\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1]);*/
}
}
}

4
core/net/rime/collect.h
View File

@ -47,7 +47,7 @@
*
* This file is part of the Contiki operating system.
*
* $Id: collect.h,v 1.22 2010/10/03 20:08:44 adamdunkels Exp $
* $Id: collect.h,v 1.23 2010/10/28 15:36:02 adamdunkels Exp $
*/
/**
@ -101,7 +101,7 @@ struct collect_conn {
struct ctimer keepalive_timer;
clock_time_t keepalive_period;
struct timer proactive_maintenence_timer;
struct ctimer proactive_probing_timer;
rimeaddr_t parent, current_parent;
uint16_t rtmetric;