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Added mechanisms for explicit de-synchronization of synchronized neighbors. Added link-layer ACKs. Fixed bugs with MAC-layer interaction. Now seems to work somewhat (didn't work at all before, in some cases), but there are still problems with packet loss.

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This commit is contained in:
adamdunkels 2010-10-20 15:23:43 +00:00
parent 3d51e065c1
commit 3ffcff0656
1 changed files with 76 additions and 23 deletions
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99
core/net/mac/lpp.c
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@ -28,7 +28,7 @@
*
* This file is part of the Contiki operating system.
*
* $Id: lpp.c,v 1.37 2010/10/03 20:37:32 adamdunkels Exp $
* $Id: lpp.c,v 1.38 2010/10/20 15:23:43 adamdunkels Exp $
*/
/**
@ -77,16 +77,16 @@
#define WITH_ACK_OPTIMIZATION 0
#define WITH_PROBE_AFTER_RECEPTION 0
#define WITH_PROBE_AFTER_TRANSMISSION 0
#define WITH_ENCOUNTER_OPTIMIZATION 1
#define WITH_ENCOUNTER_OPTIMIZATION 0
#define WITH_ADAPTIVE_OFF_TIME 0
#define WITH_PENDING_BROADCAST 1
#define WITH_PENDING_BROADCAST 0
#define WITH_STREAMING 1
#define LISTEN_TIME (CLOCK_SECOND / 128)
#define OFF_TIME (CLOCK_SECOND / NETSTACK_RDC_CHANNEL_CHECK_RATE - LISTEN_TIME)
#define PACKET_LIFETIME (LISTEN_TIME + OFF_TIME)
#define UNICAST_TIMEOUT (1 * PACKET_LIFETIME)
#define UNICAST_TIMEOUT (1 * PACKET_LIFETIME + PACKET_LIFETIME / 2)
#define PROBE_AFTER_TRANSMISSION_TIME (LISTEN_TIME * 2)
#define LOWEST_OFF_TIME (CLOCK_SECOND / 8)
@ -175,8 +175,8 @@ struct encounter {
LIST(encounter_list);
MEMB(encounter_memb, struct encounter, MAX_ENCOUNTERS);
static uint8_t is_streaming = 0;
#if WITH_STREAMING
static uint8_t is_streaming;
static struct ctimer stream_probe_timer, stream_off_timer;
#define STREAM_PROBE_TIME CLOCK_SECOND / 128
#define STREAM_OFF_TIME CLOCK_SECOND / 2
@ -344,9 +344,8 @@ turn_radio_on_for_neighbor(rimeaddr_t *neighbor, struct queue_list_item *i)
}
/*---------------------------------------------------------------------------*/
static void
remove_queued_packet(void *item)
remove_queued_packet(struct queue_list_item *i, uint8_t tx_ok)
{
struct queue_list_item *i = item;
mac_callback_t sent;
void *ptr;
int num_transmissions = 0;
@ -373,20 +372,33 @@ remove_queued_packet(void *item)
ptr = i->sent_callback_ptr;
num_transmissions = i->num_transmissions;
memb_free(&queued_packets_memb, i);
if(num_transmissions == 0) {
status = MAC_TX_ERR;
if(num_transmissions == 0 || tx_ok == 0) {
status = MAC_TX_NOACK;
} else {
status = MAC_TX_OK;
}
mac_call_sent_callback(sent, ptr, status, num_transmissions);
}
/*---------------------------------------------------------------------------*/
static void
remove_queued_broadcast_packet_callback(void *item)
{
remove_queued_packet(item, 1);
}
/*---------------------------------------------------------------------------*/
static void
remove_queued_old_packet_callback(void *item)
{
remove_queued_packet(item, 0);
}
/*---------------------------------------------------------------------------*/
#if WITH_PENDING_BROADCAST
static void
set_broadcast_flag(struct queue_list_item *i, uint8_t flag)
{
i->broadcast_flag = flag;
ctimer_set(&i->removal_timer, PACKET_LIFETIME, remove_queued_packet, i);
ctimer_set(&i->removal_timer, PACKET_LIFETIME,
remove_queued_broadcast_packet_callback, i);
}
#endif /* WITH_PENDING_BROADCAST */
/*---------------------------------------------------------------------------*/
@ -421,7 +433,6 @@ send_probe(void)
int hdrlen = NETSTACK_FRAMER.create();
if(hdrlen == 0) {
/* Failed to send */
PRINTF("contikimac: send failed, too large header\n");
return;
}
}
@ -443,11 +454,12 @@ send_probe(void)
/* PRINTF("Sending probe\n");*/
/* printf("probe\n");*/
/* XXX should first check access to the medium (CCA - Clear Channel
Assessment) and add LISTEN_TIME to off_time_adjustment if there
is a packet in the air. */
NETSTACK_RADIO.send(packetbuf_hdrptr(), packetbuf_totlen());
if(NETSTACK_RADIO.channel_clear()) {
NETSTACK_RADIO.send(packetbuf_hdrptr(), packetbuf_totlen());
} else {
off_time_adjustment = random_rand() % (OFF_TIME / 2);
}
compower_accumulate(&compower_idle_activity);
}
@ -462,7 +474,9 @@ send_stream_probe(void *dummy)
/* Send a probe packet. */
send_probe();
#if WITH_STREAMING
is_streaming = 1;
#endif /* WITH_STREAMING */
}
/*---------------------------------------------------------------------------*/
static int
@ -551,12 +565,17 @@ dutycycle(void *ptr)
/* If we are not listening for announcements, we turn the radio
off and wait until we send the next probe. */
if(is_listening == 0) {
int current_off_time;
if(!NETSTACK_RADIO.receiving_packet()) {
turn_radio_off();
compower_accumulate(&compower_idle_activity);
}
ctimer_set(t, off_time + off_time_adjustment, (void (*)(void *))dutycycle, t);
off_time_adjustment = 0;
current_off_time = off_time - off_time_adjustment;
if(current_off_time < LISTEN_TIME * 2) {
current_off_time = LISTEN_TIME * 2;
}
off_time_adjustment = 0;
ctimer_set(t, current_off_time, (void (*)(void *))dutycycle, t);
PT_YIELD(&dutycycle_pt);
#if WITH_ADAPTIVE_OFF_TIME
@ -623,11 +642,12 @@ send_packet(mac_callback_t sent, void *ptr)
memcpy(packetbuf_hdrptr(), &hdr, sizeof(struct lpp_hdr));
packetbuf_compact();
packetbuf_set_attr(PACKETBUF_ATTR_MAC_ACK, 1);
{
int hdrlen = NETSTACK_FRAMER.create();
if(hdrlen == 0) {
/* Failed to send */
PRINTF("contikimac: send failed, too large header\n");
mac_call_sent_callback(sent, ptr, MAC_TX_ERR_FATAL, 0);
return;
}
@ -685,7 +705,8 @@ send_packet(mac_callback_t sent, void *ptr)
i->broadcast_flag = BROADCAST_FLAG_NONE;
#endif /* WITH_PENDING_BROADCAST */
}
ctimer_set(&i->removal_timer, timeout, remove_queued_packet, i);
ctimer_set(&i->removal_timer, timeout,
remove_queued_old_packet_callback, i);
/* Wait for a probe packet from a neighbor. The actual packet
transmission is handled by the read_packet() function,
@ -762,6 +783,9 @@ input_packet(void)
struct queue_list_item *i;
for(i = list_head(queued_packets_list); i != NULL; i = list_item_next(i)) {
const rimeaddr_t *receiver;
uint8_t sent;
sent = 0;
receiver = queuebuf_addr(i->packet, PACKETBUF_ADDR_RECEIVER);
if(rimeaddr_cmp(receiver, &hdr.sender) ||
@ -773,8 +797,8 @@ input_packet(void)
i->broadcast_flag == BROADCAST_FLAG_SEND) {
i->num_transmissions = 1;
NETSTACK_RADIO.send(queuebuf_dataptr(i->packet),
queuebuf_datalen(i->packet));
turn_radio_off();
queuebuf_datalen(i->packet));
sent = 1;
PRINTF("%d.%d: got a probe from %d.%d, sent packet to %d.%d\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
hdr.sender.u8[0], hdr.sender.u8[1],
@ -806,7 +830,32 @@ input_packet(void)
neighbors, and are dequeued by the dutycycling function
instead, after the appropriate time. */
if(!rimeaddr_cmp(receiver, &rimeaddr_null)) {
remove_queued_packet(i);
#define INTER_PACKET_INTERVAL RTIMER_ARCH_SECOND / 5000
#define ACK_LEN 3
#define AFTER_ACK_DETECTECT_WAIT_TIME RTIMER_ARCH_SECOND / 1000
rtimer_clock_t wt;
uint8_t ack_received = 0;
wt = RTIMER_NOW();
while(RTIMER_CLOCK_LT(RTIMER_NOW(), wt + INTER_PACKET_INTERVAL)) { }
/* Check for incoming ACK. */
if((NETSTACK_RADIO.receiving_packet() ||
NETSTACK_RADIO.pending_packet() ||
NETSTACK_RADIO.channel_clear() == 0)) {
int len;
uint8_t ackbuf[ACK_LEN];
wt = RTIMER_NOW();
while(RTIMER_CLOCK_LT(RTIMER_NOW(), wt + AFTER_ACK_DETECTECT_WAIT_TIME)) { }
len = NETSTACK_RADIO.read(ackbuf, ACK_LEN);
}
if(ack_received) {
remove_queued_packet(i, 1);
} else {
remove_queued_packet(i, 0);
}
#if WITH_PROBE_AFTER_TRANSMISSION
/* Send a probe packet to catch any reply from the other node. */
@ -821,6 +870,10 @@ input_packet(void)
#endif /* WITH_STREAMING */
}
if(sent) {
turn_radio_off();
}
#if WITH_ACK_OPTIMIZATION
if(packetbuf_attr(PACKETBUF_ATTR_RELIABLE) ||
packetbuf_attr(PACKETBUF_ATTR_ERELIABLE)) {