Several bugfixes to the proactive link estimate maintenance code, which is now enabled by default. Simplified DRAW_TREE code for drawing routing graph in Cooja. Added routing metric penalty to parents that are congested or that drop packets.
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adamdunkels
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212e73faa6
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65d640ac53
@ -33,7 +33,7 @@
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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: collect.c,v 1.55 2010/10/03 20:08:44 adamdunkels Exp $
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* $Id: collect.c,v 1.56 2010/10/04 20:27:50 adamdunkels Exp $
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*/
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/**
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@ -127,7 +127,7 @@ struct ack_msg {
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#define MAX_MAC_REXMITS 2
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#define MAX_ACK_MAC_REXMITS 3
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#define REXMIT_TIME CLOCK_SECOND * 1
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#define FORWARD_PACKET_LIFETIME (60 * (REXMIT_TIME) << 3)
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#define FORWARD_PACKET_LIFETIME (8 * (REXMIT_TIME) << 3)
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#define MAX_SENDING_QUEUE 16
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#define KEEPALIVE_REXMITS 8
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@ -156,8 +156,7 @@ MEMB(send_queue_memb, struct packetqueue_item, MAX_SENDING_QUEUE);
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queue, the system periodically sends a dummy packet to potential
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parents, i.e., neighbors with a lower rtmetric than we have but for
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which we do not yet have a link quality estimate. */
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#define WITH_PROACTIVE_MAINTENANCE 0
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#define PROACTIVE_MAINTENANCE_INTERVAL CLOCK_SECOND * 60 * 4
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#define PROACTIVE_MAINTENANCE_INTERVAL CLOCK_SECOND * 60
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#define PROACTIVE_MAINTENANCE_REXMITS 8
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/* COLLECT_CONF_ANNOUNCEMENTS defines if the Collect implementation
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@ -201,7 +200,7 @@ struct {
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} stats;
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/* Debug definition: draw routing tree in Cooja. */
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#define DRAW_TREE 0
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#define DRAW_TREE 1
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#define DEBUG 0
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#if DEBUG
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@ -289,6 +288,12 @@ update_parent(struct collect_conn *tc)
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by Gnawali et al (SenSys 2009). */
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if(best != NULL) {
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rimeaddr_t previous_parent;
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if(DRAW_TREE) {
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rimeaddr_copy(&previous_parent, &tc->parent);
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}
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if(current == NULL) {
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/* New parent. */
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PRINTF("update_parent: new parent %d.%d\n",
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@ -296,9 +301,6 @@ update_parent(struct collect_conn *tc)
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rimeaddr_copy(&tc->parent, &best->addr);
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stats.foundroute++;
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} else {
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#if DRAW_TREE
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printf("#L %d 0\n", tc->parent.u8[0]);
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#endif /* DRAW_TREE */
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if(collect_neighbor_rtmetric_link_estimate(best) +
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SIGNIFICANT_RTMETRIC_PARENT_CHANGE <
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collect_neighbor_rtmetric_link_estimate(current)) {
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@ -312,15 +314,20 @@ update_parent(struct collect_conn *tc)
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stats.newparent++;
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}
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}
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#if DRAW_TREE
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printf("#L %d 1\n", tc->parent.u8[0]);
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#endif /* DRAW_TREE */
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if(DRAW_TREE) {
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if(!rimeaddr_cmp(&previous_parent, &tc->parent)) {
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if(!rimeaddr_cmp(&previous_parent, &rimeaddr_null)) {
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printf("#L %d 0\n", previous_parent.u8[0]);
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}
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printf("#L %d 1\n", tc->parent.u8[0]);
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}
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}
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} else {
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/* No parent. */
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if(!rimeaddr_cmp(&tc->parent, &rimeaddr_null)) {
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#if DRAW_TREE
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printf("#L %d 0\n", tc->parent.u8[0]);
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#endif /* DRAW_TREE */
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if(DRAW_TREE) {
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printf("#L %d 0\n", tc->parent.u8[0]);
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}
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stats.routelost++;
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}
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rimeaddr_copy(&tc->parent, &rimeaddr_null);
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@ -411,11 +418,13 @@ update_rtmetric(struct collect_conn *tc)
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PRINTF("Sending queued packet because rtmetric was max\n");
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send_queued_packet(tc);
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}
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if(DRAW_TREE) {
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if(old_rtmetric != new_rtmetric) {
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printf("#A rt=%d,p=%d\n", tc->rtmetric, tc->parent.u8[0]);
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}
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}
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}
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#if DRAW_TREE
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printf("#A rt=%d,p=%d\n", tc->rtmetric, tc->parent.u8[0]);
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#endif /* DRAW_TREE */
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}
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/*---------------------------------------------------------------------------*/
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static int
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@ -425,7 +434,6 @@ enqueue_dummy_packet(struct collect_conn *c, int rexmits)
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packetbuf_clear();
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packetbuf_set_attr(PACKETBUF_ATTR_EPACKET_ID, c->eseqno - 1);
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packetbuf_set_attr(PACKETBUF_ATTR_PACKET_ID, c->seqno - 1);
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packetbuf_set_addr(PACKETBUF_ADDR_ESENDER, &rimeaddr_node_addr);
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packetbuf_set_attr(PACKETBUF_ATTR_HOPS, 1);
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packetbuf_set_attr(PACKETBUF_ATTR_TTL, 1);
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@ -485,19 +493,20 @@ send_queued_packet(struct collect_conn *c)
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estimate and send a dummy packet to it. This allows us to
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quickly gauge the link quality of neighbors that we do not
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currently use as parents. */
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if(WITH_PROACTIVE_MAINTENANCE && timer_expired(&c->proactive_maintenence_timer)) {
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if(timer_expired(&c->proactive_maintenence_timer)) {
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struct collect_neighbor *n;
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timer_set(&c->proactive_maintenence_timer,
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PROACTIVE_MAINTENANCE_INTERVAL);
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/* Find the neighbor with the lowest number of estimates. */
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for(n = list_head(collect_neighbor_list(&c->neighbor_list));
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n != NULL; n = list_item_next(n)) {
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if(n->rtmetric + COLLECT_LINK_ESTIMATE_UNIT < c->rtmetric &&
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collect_link_estimate_num_estimates(&n->le) == 0) {
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rimeaddr_t current_parent;
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printf("proactive maintenance: found neighbor with no link estimate, %d.%d\n",
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PRINTF("proactive maintenance: found neighbor with no link estimate, %d.%d\n",
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n->addr.u8[0], n->addr.u8[1]);
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rimeaddr_copy(¤t_parent, &c->parent);
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@ -506,7 +515,7 @@ send_queued_packet(struct collect_conn *c)
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send_queued_packet(c);
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}
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rimeaddr_copy(&c->parent, ¤t_parent);
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break;
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return;
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}
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}
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}
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@ -632,7 +641,7 @@ retransmit_current_packet(struct collect_conn *c)
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collect_neighbor_tx(current_neighbor, c->max_rexmits);
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}*/
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printf("parent change from %d.%d to %d.%d after %d tx\n",
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PRINTF("parent change from %d.%d to %d.%d after %d tx\n",
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c->current_parent.u8[0], c->current_parent.u8[1],
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c->parent.u8[0], c->parent.u8[1],
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c->transmissions);
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@ -741,10 +750,33 @@ handle_ack(struct collect_conn *tc)
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msg->flags,
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rtmetric);
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/* The ack contains information about the state of the packet and
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of the node that received it. We do different things depending
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on whether or not the packet was dropped. First, we check if
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the receiving node was congested. If so, we add a maximum
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transmission number to its routing metric, which increases the
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chance that another parent will be chosen. */
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if(msg->flags & ACK_FLAGS_CONGESTED) {
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collect_neighbor_tx(n, tc->max_rexmits);
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update_rtmetric(tc);
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}
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if(!(msg->flags & ACK_FLAGS_DROPPED)) {
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/* If the packet was successfully received, we send the next packet. */
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send_next_packet(tc);
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} else {
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PRINTF("ack drop flag\n");
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/* If the packet was lost due to its lifetime being exceeded,
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there is not much more we can do with the packet, so we send
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the next one instead. */
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if((msg->flags & ACK_FLAGS_LIFETIME_EXCEEDED)) {
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send_next_packet(tc);
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} else {
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/* If the packet was dropped, but without the node being
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congested or the packets lifetime being exceeded, we
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penalize the parent and try sending the packet again. */
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collect_neighbor_tx(n, tc->max_rexmits);
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update_rtmetric(tc);
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send_queued_packet(tc);
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}
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}
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if(msg->flags & ACK_FLAGS_RTMETRIC_NEEDS_UPDATE) {
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bump_advertisement(tc);
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@ -843,15 +875,18 @@ node_packet_received(struct unicast_conn *c, const rimeaddr_t *from)
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}
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}
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/* Remember that we have seen this packet for later. */
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recent_packets[recent_packet_ptr].eseqno =
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packetbuf_attr(PACKETBUF_ATTR_EPACKET_ID);
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rimeaddr_copy(&recent_packets[recent_packet_ptr].originator,
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packetbuf_addr(PACKETBUF_ADDR_ESENDER));
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recent_packets[recent_packet_ptr].conn = tc;
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recent_packet_ptr = (recent_packet_ptr + 1) % NUM_RECENT_PACKETS;
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/* Remember that we have seen this packet for later, but only if
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it has a length that is larger than zero. Packets with size
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zero are keepalive or proactive link estimate probes, so we do
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not record them in our history. */
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if(packetbuf_datalen() > sizeof(struct data_msg_hdr)) {
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recent_packets[recent_packet_ptr].eseqno =
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packetbuf_attr(PACKETBUF_ATTR_EPACKET_ID);
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rimeaddr_copy(&recent_packets[recent_packet_ptr].originator,
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packetbuf_addr(PACKETBUF_ADDR_ESENDER));
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recent_packets[recent_packet_ptr].conn = tc;
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recent_packet_ptr = (recent_packet_ptr + 1) % NUM_RECENT_PACKETS;
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}
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/* If we are the sink, the packet has reached its final
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destination and we call the receive function. */
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if(tc->rtmetric == RTMETRIC_SINK) {
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@ -928,7 +963,7 @@ node_packet_received(struct unicast_conn *c, const rimeaddr_t *from)
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} else {
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send_ack(tc, &ack_to,
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ackflags | ACK_FLAGS_DROPPED | ACK_FLAGS_CONGESTED);
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printf("%d.%d: packet dropped: no queue buffer available\n",
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PRINTF("%d.%d: packet dropped: no queue buffer available\n",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1]);
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stats.qdrop++;
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}
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@ -994,7 +1029,7 @@ static void
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timedout(struct collect_conn *tc)
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{
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struct collect_neighbor *n;
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printf("%d.%d: timedout after %d retransmissions to %d.%d (max retransmissions %d): packet dropped\n",
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PRINTF("%d.%d: timedout after %d retransmissions to %d.%d (max retransmissions %d): packet dropped\n",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1], tc->transmissions,
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tc->current_parent.u8[0], tc->current_parent.u8[1],
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tc->max_rexmits);
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@ -1229,6 +1264,10 @@ collect_set_sink(struct collect_conn *tc, int should_be_sink)
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update_rtmetric(tc);
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bump_advertisement(tc);
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if(DRAW_TREE) {
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printf("#A rt=0,p=0\n");
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}
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}
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/*---------------------------------------------------------------------------*/
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int
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@ -1286,7 +1325,7 @@ collect_send(struct collect_conn *tc, int rexmits)
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send_queued_packet(tc);
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return 1;
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} else {
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printf("%d.%d: drop originated packet: no queuebuf\n",
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PRINTF("%d.%d: drop originated packet: no queuebuf\n",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1]);
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}
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@ -1310,7 +1349,7 @@ collect_send(struct collect_conn *tc, int rexmits)
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tc)) {
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return 1;
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} else {
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printf("%d.%d: drop originated packet: no queuebuf\n",
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PRINTF("%d.%d: drop originated packet: no queuebuf\n",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1]);
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}
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}
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@ -1330,9 +1369,9 @@ collect_purge(struct collect_conn *tc)
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collect_neighbor_list_purge(&tc->neighbor_list);
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rimeaddr_copy(&tc->parent, &rimeaddr_null);
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update_rtmetric(tc);
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#if DRAW_TREE
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printf("#L %d 0\n", tc->parent.u8[0]);
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#endif /* DRAW_TREE */
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if(DRAW_TREE) {
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printf("#L %d 0\n", tc->parent.u8[0]);
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}
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rimeaddr_copy(&tc->parent, &rimeaddr_null);
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}
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/*---------------------------------------------------------------------------*/
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