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Improved parent management: parent neighbor is retained until a better neighbor is found (with 1 ETX less than parent). Don't drop parent neighbors when loop is detected (loops are transient anyway).

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This commit is contained in:
adamdunkels 2010-04-01 10:03:19 +00:00
parent add426de4b
commit d7457bc340
1 changed files with 40 additions and 27 deletions
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61
core/net/rime/collect.c
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@ -33,7 +33,7 @@
*
* This file is part of the Contiki operating system.
*
* $Id: collect.c,v 1.44 2010/03/29 21:52:25 adamdunkels Exp $
* $Id: collect.c,v 1.45 2010/04/01 10:03:19 adamdunkels Exp $
*/
/**
@ -85,7 +85,8 @@ struct ack_msg {
static struct recent_packet recent_packets[NUM_RECENT_PACKETS];
static uint8_t recent_packet_ptr;
#define MAX_MAC_REXMITS 3
#define MAX_MAC_REXMITS 2
#define MAX_ACK_MAC_REXMITS 3
#define REXMIT_TIME CLOCK_SECOND * 2
#define FORWARD_PACKET_LIFETIME (6 * (REXMIT_TIME) << 3)
#define MAX_SENDING_QUEUE 6
@ -132,9 +133,28 @@ update_rtmetric(struct collect_conn *tc)
/* We should only update the rtmetric if we are not the sink. */
if(tc->rtmetric != SINK) {
struct collect_neighbor *best;
/* Pick the neighbor to use as a parent. We normally use
the parent in the n->parent. */
n = collect_neighbor_find(&tc->parent);
/* Find the neighbor with the lowest rtmetric. */
n = collect_neighbor_best();
best = collect_neighbor_best();
/* If we do not have a parent in n->parent, we use the best
neighbor that we have as a new parent. Also, if the best
neighbor is better than our parent (which is defined as having
an ETX that is 1 ETX lower than the current parent), we
choose that neighbor as the new parent. */
best = collect_neighbor_best();
if(best != NULL && (n == NULL ||
collect_neighbor_etx(best) <
collect_neighbor_etx(n) - COLLECT_NEIGHBOR_ETX_SCALE)) {
rimeaddr_copy(&tc->parent, &best->addr);
printf("Switched parent to %d.%d\n",
tc->parent.u8[0], tc->parent.u8[1]);
}
/* If n is NULL, we have no best neighbor. */
if(n == NULL) {
@ -249,23 +269,17 @@ send_queued_packet(void)
q = packetqueue_queuebuf(i);
if(q != NULL) {
PRINTF("%d.%d: queue, q is on queue\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1]);
/* Place the queued packet into the packetbuf. */
queuebuf_to_packetbuf(q);
n = collect_neighbor_best();
/* Pick the neighbor to which to send the packet. We use the
parent in the n->parent. */
n = collect_neighbor_find(&c->parent);
while(n != NULL && rimeaddr_cmp(&n->addr, packetbuf_addr(PACKETBUF_ADDR_SENDER))) {
PRINTF("%d.%d: avoiding fowarding loop to %d.%d\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
n->addr.u8[0], n->addr.u8[1]);
collect_neighbor_remove(&n->addr);
update_rtmetric(c);
n = collect_neighbor_best();
}
/* Don't send to the neighbor if it is the same neighbor that sent
us the packet. */
if(n != NULL) {
clock_time_t time;
uint8_t rexmit_time_scaling;
@ -276,7 +290,6 @@ send_queued_packet(void)
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
n->addr.u8[0], n->addr.u8[1]);
rimeaddr_copy(&c->current_receiver, &n->addr);
c->sending = 1;
c->transmissions = 0;
c->max_rexmits = packetbuf_attr(PACKETBUF_ATTR_MAX_REXMIT);
@ -334,7 +347,7 @@ handle_ack(struct collect_conn *tc)
struct collect_neighbor *n;
if(rimeaddr_cmp(packetbuf_addr(PACKETBUF_ADDR_SENDER),
&tc->current_receiver) &&
&tc->parent) &&
packetbuf_attr(PACKETBUF_ATTR_PACKET_ID) == tc->seqno) {
@ -348,7 +361,7 @@ handle_ack(struct collect_conn *tc)
PRINTF("%d.%d: ACK from %d.%d after %d transmissions, flags %02x\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
tc->current_receiver.u8[0], tc->current_receiver.u8[1],
tc->parent.u8[0], tc->parent.u8[1],
tc->transmissions,
msg->flags);
@ -387,7 +400,7 @@ send_ack(struct collect_conn *tc, const rimeaddr_t *to, int congestion, int drop
packetbuf_set_attr(PACKETBUF_ATTR_RELIABLE, 0);
packetbuf_set_attr(PACKETBUF_ATTR_ERELIABLE, 0);
packetbuf_set_attr(PACKETBUF_ATTR_PACKET_ID, packet_seqno);
packetbuf_set_attr(PACKETBUF_ATTR_MAX_MAC_TRANSMISSIONS, 3);
packetbuf_set_attr(PACKETBUF_ATTR_MAX_MAC_TRANSMISSIONS, MAX_ACK_MAC_REXMITS);
unicast_send(&tc->unicast_conn, to);
PRINTF("%d.%d: collect: Sending ACK to %d.%d for %d\n",
@ -533,8 +546,8 @@ node_packet_received(struct unicast_conn *c, const rimeaddr_t *from)
packetbuf_attr(PACKETBUF_ATTR_PACKET_TYPE),
packetbuf_addr(PACKETBUF_ADDR_SENDER)->u8[0],
packetbuf_addr(PACKETBUF_ADDR_SENDER)->u8[1],
tc->current_receiver.u8[0],
tc->current_receiver.u8[1],
tc->parent.u8[0],
tc->parent.u8[1],
packetbuf_attr(PACKETBUF_ATTR_PACKET_ID),
tc->seqno);
handle_ack(tc);
@ -554,7 +567,7 @@ node_packet_sent(struct unicast_conn *c, int status, int transmissions)
PACKETBUF_ATTR_PACKET_TYPE_DATA && transmissions > 0) {
PRINTF("%d.%d: sent to %d.%d after %d transmissions\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
tc->current_receiver.u8[0], tc->current_receiver.u8[1],
tc->parent.u8[0], tc->parent.u8[1],
transmissions);
/* neighbor_update_etx(neighbor_find(to), transmissions);
@ -579,7 +592,7 @@ node_packet_sent(struct unicast_conn *c, int status, int transmissions)
/* Update ETX with the number of transmissions. */
PRINTF("Updating ETX with %d transmissions (punished %d)\n", tc->transmissions,
tx);
collect_neighbor_update_etx(collect_neighbor_find(&tc->current_receiver), tx);
collect_neighbor_update_etx(collect_neighbor_find(&tc->parent), tx);
update_rtmetric(tc);
}
}
@ -592,7 +605,7 @@ timedout(struct collect_conn *tc)
tc->max_rexmits);
tc->sending = 0;
collect_neighbor_timedout_etx(collect_neighbor_find(&tc->current_receiver), tc->transmissions);
collect_neighbor_timedout_etx(collect_neighbor_find(&tc->parent), tc->transmissions);
update_rtmetric(tc);
send_next_packet(tc);