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Added MAC-layer duplicate message suppression when using 802.15.4 auto ack

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This commit is contained in:
nifi 2010-11-12 12:53:16 +00:00
parent 7af5b095e2
commit 05d78522d3
1 changed files with 33 additions and 1 deletions
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34
core/net/mac/nullrdc-framer.c
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@ -28,7 +28,7 @@
*
* This file is part of the Contiki operating system.
*
* $Id: nullrdc-framer.c,v 1.3 2010/06/14 19:19:17 adamdunkels Exp $
* $Id: nullrdc-framer.c,v 1.4 2010/11/12 12:53:16 nifi Exp $
*/
/**
@ -65,6 +65,16 @@
#define AFTER_ACK_DETECTED_WAIT_TIME RTIMER_SECOND / 1500
#define ACK_LEN 3
#if NULLRDC_FRAMER_802154_AUTOACK
struct seqno {
rimeaddr_t sender;
uint8_t seqno;
};
#define MAX_SEQNOS 8
static struct seqno received_seqnos[MAX_SEQNOS];
#endif /* NULLRDC_FRAMER_802154_AUTOACK */
/*---------------------------------------------------------------------------*/
static void
send_packet(mac_callback_t sent, void *ptr)
@ -177,6 +187,28 @@ packet_input(void)
if(NETSTACK_FRAMER.parse() == 0) {
PRINTF("nullrdc_framer: failed to parse %u\n", packetbuf_datalen());
} else {
#if NULLRDC_FRAMER_802154_AUTOACK
/* Check for duplicate packet by comparing the sequence number
of the incoming packet with the last few ones we saw. */
int i;
for(i = 0; i < MAX_SEQNOS; ++i) {
if(packetbuf_attr(PACKETBUF_ATTR_PACKET_ID) == received_seqnos[i].seqno &&
rimeaddr_cmp(packetbuf_addr(PACKETBUF_ADDR_SENDER),
&received_seqnos[i].sender)) {
/* Drop the packet. */
PRINTF("nullrdc_framer: drop duplicate link layer packet %u\n",
packetbuf_attr(PACKETBUF_ATTR_PACKET_ID));
return;
}
}
for(i = MAX_SEQNOS - 1; i > 0; --i) {
memcpy(&received_seqnos[i], &received_seqnos[i - 1],
sizeof(struct seqno));
}
received_seqnos[0].seqno = packetbuf_attr(PACKETBUF_ATTR_PACKET_ID);
rimeaddr_copy(&received_seqnos[0].sender,
packetbuf_addr(PACKETBUF_ADDR_SENDER));
#endif /* NULLRDC_FRAMER_802154_AUTOACK */
NETSTACK_MAC.input();
}
}