Added an optimization option that avoids multiple simultaneous broadcasts from neighbors: when a broadcast is to be sent, a sender does not send until it knows that no other nodes are broadcasting.
This commit is contained in:
adamdunkels
parent
fe30886b37
commit
fe5a1f1068
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@ -28,7 +28,7 @@
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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: lpp.c,v 1.21 2009/05/06 15:06:38 adamdunkels Exp $
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* $Id: lpp.c,v 1.22 2009/05/10 21:09:05 adamdunkels Exp $
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*/
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/**
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@ -78,6 +78,7 @@
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#define WITH_PROBE_AFTER_TRANSMISSION 0
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#define WITH_ENCOUNTER_OPTIMIZATION 1
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#define WITH_ADAPTIVE_OFF_TIME 0
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#define WITH_PENDING_BROADCAST 1
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#ifdef LPP_CONF_LISTEN_TIME
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#define LISTEN_TIME LPP_CONF_LISTEN_TIME
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@ -150,10 +151,17 @@ static clock_time_t off_time = OFF_TIME;
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struct queue_list_item {
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struct queue_list_item *next;
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struct queuebuf *packet;
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struct ctimer timer;
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struct ctimer removal_timer;
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struct compower_activity compower;
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#if WITH_PENDING_BROADCAST
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uint8_t broadcast_flag;
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#endif /* WITH_PENDING_BROADCAST */
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};
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#define BROADCAST_FLAG_NONE 0
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#define BROADCAST_FLAG_WAITING 1
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#define BROADCAST_FLAG_PENDING 2
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#define BROADCAST_FLAG_SEND 3
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LIST(pending_packets_list);
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LIST(queued_packets_list);
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@ -250,9 +258,11 @@ turn_radio_on_for_neighbor(rimeaddr_t *neighbor, struct queue_list_item *i)
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struct encounter *e;
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if(rimeaddr_cmp(neighbor, &rimeaddr_null)) {
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#if ! WITH_PENDING_BROADCAST
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/* We have been asked to turn on the radio for a broadcast, so we
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just turn on the radio. */
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turn_radio_on();
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#endif /* ! WITH_PENDING_BROADCAST */
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list_add(queued_packets_list, i);
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return;
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}
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@ -313,7 +323,7 @@ remove_queued_packet(void *item)
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1]);
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ctimer_stop(&i->timer);
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ctimer_stop(&i->removal_timer);
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queuebuf_free(i->packet);
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list_remove(pending_packets_list, i);
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list_remove(queued_packets_list, i);
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@ -327,6 +337,15 @@ remove_queued_packet(void *item)
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memb_free(&queued_packets_memb, i);
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}
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/*---------------------------------------------------------------------------*/
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#if WITH_PENDING_BROADCAST
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static void
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set_broadcast_flag(struct queue_list_item *i, uint8_t flag)
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{
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i->broadcast_flag = flag;
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ctimer_set(&i->removal_timer, PACKET_LIFETIME, remove_queued_packet, i);
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}
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#endif /* WITH_PENDING_BROADCAST */
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/*---------------------------------------------------------------------------*/
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static void
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listen_callback(int periods)
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{
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@ -379,6 +398,25 @@ send_probe(void)
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compower_accumulate(&compower_idle_activity);
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}
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/*---------------------------------------------------------------------------*/
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static int
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num_packets_to_send(void)
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{
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#if WITH_PENDING_BROADCAST
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struct queue_list_item *i;
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int num = 0;
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for(i = list_head(queued_packets_list); i != NULL; i = i->next) {
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if(i->broadcast_flag == BROADCAST_FLAG_SEND ||
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i->broadcast_flag == BROADCAST_FLAG_NONE) {
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++num;
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}
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}
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return num;
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#else /* WITH_PENDING_BROADCAST */
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return list_length(queued_packets_list);
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#endif /* WITH_PENDING_BROADCAST */
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}
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/*---------------------------------------------------------------------------*/
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/**
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* Duty cycle the radio and send probes. This function is called
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* repeatedly by a ctimer. The function restart_dutycycle() is used to
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@ -393,6 +431,22 @@ dutycycle(void *ptr)
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while(1) {
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#if WITH_PENDING_BROADCAST
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{
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struct queue_list_item *p;
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/* Before sending the probe, we mark all broadcast packets in
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our output queue to be pending. This means that they are
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ready to be sent, once we know that no neighbor is
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currently broadcasting. */
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for(p = list_head(queued_packets_list); p != NULL; p = p->next) {
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if(p->broadcast_flag == BROADCAST_FLAG_WAITING) {
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PRINTF("wait -> pending\n");
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set_broadcast_flag(p, BROADCAST_FLAG_PENDING);
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}
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}
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}
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#endif /* WITH_PENDING_BROADCAST */
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/* Send a probe packet. */
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send_probe();
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@ -404,11 +458,28 @@ dutycycle(void *ptr)
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ctimer_set(t, LISTEN_TIME, (void (*)(void *))dutycycle, t);
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PT_YIELD(&dutycycle_pt);
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#if WITH_PENDING_BROADCAST
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{
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struct queue_list_item *p;
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/* Go through the list of packets we are waiting to send, and
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check if there are any pending broadcasts in the list. If
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there are pending broadcasts, and we did not receive any
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broadcast packets from a neighbor in response to our probe,
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we mark the broadcasts as being ready to send. */
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for(p = list_head(queued_packets_list); p != NULL; p = p->next) {
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if(p->broadcast_flag == BROADCAST_FLAG_PENDING) {
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PRINTF("pending -> send\n");
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set_broadcast_flag(p, BROADCAST_FLAG_SEND);
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turn_radio_on();
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}
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}
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}
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#endif /* WITH_PENDING_BROADCAST */
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/* If we have no packets to send (indicated by the list length of
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queued_packets_list being zero), we should turn the radio
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off. Othersize, we keep the radio on. */
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if(list_length(queued_packets_list) == 0) {
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if(num_packets_to_send() == 0) {
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/* If we are not listening for announcements, we turn the radio
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off and wait until we send the next probe. */
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@ -427,11 +498,15 @@ dutycycle(void *ptr)
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#endif /* WITH_ADAPTIVE_OFF_TIME */
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} else {
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/* We are listening for annonucements, so we count down the
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listen time, and keep the radio on. */
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is_listening--;
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ctimer_set(t, OFF_TIME, (void (*)(void *))dutycycle, t);
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PT_YIELD(&dutycycle_pt);
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}
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} else {
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/* We had pending packets to send, so we do not turn the radio off. */
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ctimer_set(t, off_time, (void (*)(void *))dutycycle, t);
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PT_YIELD(&dutycycle_pt);
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}
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@ -466,9 +541,13 @@ send_packet(void)
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{
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struct lpp_hdr hdr;
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clock_time_t timeout;
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uint8_t is_broadcast = 0;
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rimeaddr_copy(&hdr.sender, &rimeaddr_node_addr);
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rimeaddr_copy(&hdr.receiver, packetbuf_addr(PACKETBUF_ADDR_RECEIVER));
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if(rimeaddr_cmp(&hdr.receiver, &rimeaddr_null)) {
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is_broadcast = 1;
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}
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hdr.type = TYPE_DATA;
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packetbuf_hdralloc(sizeof(struct lpp_hdr));
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@ -491,7 +570,7 @@ send_packet(void)
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off_time = LOWEST_OFF_TIME;
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restart_dutycycle(off_time);
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#endif /* WITH_ADAPTIVE_OFF_TIME */
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{
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struct queue_list_item *i;
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i = memb_alloc(&queued_packets_memb);
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@ -501,17 +580,33 @@ send_packet(void)
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memb_free(&queued_packets_memb, i);
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return 0;
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} else {
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timeout = UNICAST_TIMEOUT;
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if(rimeaddr_cmp(&hdr.receiver, &rimeaddr_null)) {
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if(is_broadcast) {
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timeout = PACKET_LIFETIME;
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}
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ctimer_set(&i->timer, timeout, remove_queued_packet, i);
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#if WITH_PENDING_BROADCAST
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/* We set the broadcast state of the packet to be
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waiting. This means that the packet is waiting for our
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next probe to be sent. Our next probe is used to check if
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there are any neighbors currently broadcasting a
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packet. If so, we will get a broadcast packet in response
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to our probe. If no broadcast packet is received in
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response to our probe, we mark the packet as ready to be
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sent. */
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set_broadcast_flag(i, BROADCAST_FLAG_WAITING);
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PRINTF("-> waiting\n");
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#endif /* WITH_PENDING_BROADCAST */
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} else {
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timeout = UNICAST_TIMEOUT;
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#if WITH_PENDING_BROADCAST
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i->broadcast_flag = BROADCAST_FLAG_NONE;
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#endif /* WITH_PENDING_BROADCAST */
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}
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ctimer_set(&i->removal_timer, timeout, remove_queued_packet, i);
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/* Wait for a probe packet from a neighbor. The actual packet
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transmission is handled by the read_packet() function,
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which receives the probe from the neighbor. */
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turn_radio_on_for_neighbor(&hdr.receiver, i);
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}
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}
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}
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@ -540,6 +635,7 @@ read_packet(void)
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hdr = packetbuf_dataptr();
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packetbuf_hdrreduce(sizeof(struct lpp_hdr));
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/* PRINTF("got packet type %d\n", hdr->type);*/
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if(hdr->type == TYPE_PROBE) {
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/* Parse incoming announcements */
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struct announcement_msg *adata = packetbuf_dataptr();
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@ -560,8 +656,13 @@ read_packet(void)
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adata->data[i].value);
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}
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/* Register the encounter with the sending node. We now know the
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neighbor's phase. */
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register_encounter(&hdr->sender, reception_time);
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/* Go through the list of packets to be sent to see if any of
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them match the sender of the probe, or if they are a
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broadcast packet that should be sent. */
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if(list_length(queued_packets_list) > 0) {
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struct queue_list_item *i;
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for(i = list_head(queued_packets_list); i != NULL; i = i->next) {
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@ -569,15 +670,34 @@ read_packet(void)
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qhdr = queuebuf_dataptr(i->packet);
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if(rimeaddr_cmp(&qhdr->receiver, &hdr->sender) ||
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rimeaddr_cmp(&qhdr->receiver, &rimeaddr_null)) {
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PRINTF("%d.%d: got a probe from %d.%d, sending packet to %d.%d\n",
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rimeaddr_cmp(&qhdr->receiver, &rimeaddr_null)) {
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queuebuf_to_packetbuf(i->packet);
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#if WITH_PENDING_BROADCAST
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if(i->broadcast_flag == BROADCAST_FLAG_NONE ||
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i->broadcast_flag == BROADCAST_FLAG_SEND) {
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radio->send(queuebuf_dataptr(i->packet),
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queuebuf_datalen(i->packet));
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PRINTF("%d.%d: got a probe from %d.%d, sent packet to %d.%d\n",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
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hdr->sender.u8[0], hdr->sender.u8[1],
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qhdr->receiver.u8[0], qhdr->receiver.u8[1]);
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} else {
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PRINTF("%d.%d: got a probe from %d.%d, did not send packet\n",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
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hdr->sender.u8[0], hdr->sender.u8[1]);
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}
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#else /* WITH_PENDING_BROADCAST */
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radio->send(queuebuf_dataptr(i->packet),
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queuebuf_datalen(i->packet));
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PRINTF("%d.%d: got a probe from %d.%d, sent packet to %d.%d\n",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
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hdr->sender.u8[0], hdr->sender.u8[1],
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qhdr->receiver.u8[0], qhdr->receiver.u8[1]);
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queuebuf_to_packetbuf(i->packet);
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#endif /* WITH_PENDING_BROADCAST */
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radio->send(queuebuf_dataptr(i->packet),
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queuebuf_datalen(i->packet));
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/* Attribute the energy spent on listening for the probe
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to this packet transmission. */
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@ -626,6 +746,27 @@ read_packet(void)
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for the next packet. */
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compower_clear(¤t_packet);
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#if WITH_PENDING_BROADCAST
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if(rimeaddr_cmp(&hdr->receiver, &rimeaddr_null)) {
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/* This is a broadcast packet. Check the list of pending
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packets to see if we are currently sending a broadcast. If
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so, we refrain from sending our broadcast until one sleep
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cycle period, so that the other broadcaster will have
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finished sending. */
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struct queue_list_item *i;
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for(i = list_head(queued_packets_list); i != NULL; i = i->next) {
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/* If the packet is a broadcast packet that is not yet
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ready to be sent, we do not send it. */
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if(i->broadcast_flag == BROADCAST_FLAG_PENDING) {
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PRINTF("Someone else is sending, pending -> waiting\n");
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set_broadcast_flag(i, BROADCAST_FLAG_WAITING);
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}
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}
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}
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#endif /* WITH_PENDING_BROADCAST */
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#if WITH_PROBE_AFTER_RECEPTION
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/* XXX send probe after receiving a packet to facilitate data
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streaming. We must first copy the contents of the packetbuf into
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