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Added an optional rate limit for broadcast transmissions

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This commit is contained in:
adamdunkels 2010-04-06 11:57:43 +00:00
parent 5c75b89ef7
commit 497111bcc9
1 changed files with 31 additions and 1 deletions
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32
core/net/mac/contikimac.c
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@ -28,7 +28,7 @@
*
* This file is part of the Contiki operating system.
*
* $Id: contikimac.c,v 1.29 2010/04/05 19:28:07 adamdunkels Exp $
* $Id: contikimac.c,v 1.30 2010/04/06 11:57:43 adamdunkels Exp $
*/
/**
@ -195,6 +195,11 @@ static volatile rtimer_clock_t stream_until;
static int last_received_seqno;
static rimeaddr_t last_received_sender;
#if CONTIKIMAC_CONF_BROADCAST_RATE_LIMIT
static struct timer broadcast_rate_timer;
static int broadcast_rate_counter;
#endif /* CONTIKIMAC_CONF_BROADCAST_RATE_LIMIT */
/*---------------------------------------------------------------------------*/
static void
on(void)
@ -492,6 +497,27 @@ format_announcement(char *hdr)
#endif /* CONTIKIMAC_CONF_ANNOUNCEMENTS */
/*---------------------------------------------------------------------------*/
static int
broadcast_rate_drop(void)
{
#if CONTIKIMAC_CONF_BROADCAST_RATE_LIMIT
if(!timer_expired(&broadcast_rate_timer)) {
broadcast_rate_counter++;
if(broadcast_rate_counter < CONTIKIMAC_CONF_BROADCAST_RATE_LIMIT) {
return 0;
} else {
return 1;
}
} else {
timer_set(&broadcast_rate_timer, CLOCK_SECOND);
broadcast_rate_counter = 0;
return 0;
}
#else /* CONTIKIMAC_CONF_BROADCAST_RATE_LIMIT */
return 0;
#endif /* CONTIKIMAC_CONF_BROADCAST_RATE_LIMIT */
}
/*---------------------------------------------------------------------------*/
static int
send_packet(mac_callback_t mac_callback, void *mac_callback_ptr)
{
rtimer_clock_t t0;
@ -519,6 +545,10 @@ send_packet(mac_callback_t mac_callback, void *mac_callback_ptr)
if(rimeaddr_cmp(packetbuf_addr(PACKETBUF_ADDR_RECEIVER), &rimeaddr_null)) {
is_broadcast = 1;
PRINTDEBUG("contikimac: send broadcast\n");
if(broadcast_rate_drop()) {
return MAC_TX_COLLISION;
}
} else {
#if UIP_CONF_IPV6
PRINTDEBUG("contikimac: send unicast to %02x%02x:%02x%02x:%02x%02x:%02x%02x\n",