contiki/core/net/rime/trickle.c

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/**
* \addtogroup trickle
* @{
*/
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/*
* Copyright (c) 2007, Swedish Institute of Computer Science.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Contiki operating system.
*
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* $Id: trickle.c,v 1.9 2008/07/03 22:02:10 adamdunkels Exp $
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*/
/**
* \file
* Trickle (reliable single source flooding) for Rime
* \author
* Adam Dunkels <adam@sics.se>
*/
#include "net/rime/trickle.h"
#if NETSIM
#include "ether.h"
#endif
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#define INTERVAL_MIN 1
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#define INTERVAL_MAX 4
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#define SEQNO_LT(a, b) ((signed char)((a) - (b)) < 0)
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
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/*---------------------------------------------------------------------------*/
static void
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send(void *ptr)
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{
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struct trickle_conn *c = ptr;
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if(c->q != NULL) {
queuebuf_to_rimebuf(c->q);
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netflood_send(&c->c, c->seqno);
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ctimer_set(&c->t, c->interval << c->interval_scaling,
send, c);
} else {
PRINTF("%d.%d: trickle send but c->q == NULL\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1]);
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}
}
/*---------------------------------------------------------------------------*/
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static int
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recv(struct netflood_conn *nf, rimeaddr_t *from,
rimeaddr_t *originator, uint8_t seqno, uint8_t hops)
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{
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struct trickle_conn *c = (struct trickle_conn *)nf;
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PRINTF("%d.%d: trickle recv seqno %d our %d\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
seqno, c->seqno);
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if(seqno == c->seqno) {
/* c->cb->recv(c);*/
} else if(SEQNO_LT(seqno, c->seqno)) {
c->interval_scaling = 0;
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send(c);
} else { /* hdr->seqno > c->seqno */
#if NETSIM
/* ether_set_line(from->u8[0], from->u8[1]);*/
#endif /* NETSIM */
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c->seqno = seqno;
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/* Store the incoming data in the queuebuf */
if(c->q != NULL) {
queuebuf_free(c->q);
}
c->q = queuebuf_new_from_rimebuf();
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c->interval_scaling = 0;
send(c);
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c->cb->recv(c);
}
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return 0;
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}
/*---------------------------------------------------------------------------*/
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static void
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sent_or_dropped(struct netflood_conn *nf)
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{
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struct trickle_conn *c = (struct trickle_conn *)nf;
c->interval_scaling++;
if(c->interval_scaling > INTERVAL_MAX) {
c->interval_scaling = INTERVAL_MAX;
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}
}
/*---------------------------------------------------------------------------*/
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static const struct netflood_callbacks nf = {recv,
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sent_or_dropped,
sent_or_dropped};
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/*---------------------------------------------------------------------------*/
void
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trickle_open(struct trickle_conn *c, clock_time_t interval,
uint16_t channel, const struct trickle_callbacks *cb)
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{
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netflood_open(&c->c, interval, channel, &nf);
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c->cb = cb;
c->q = NULL;
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c->interval = interval;
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}
/*---------------------------------------------------------------------------*/
void
trickle_close(struct trickle_conn *c)
{
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netflood_close(&c->c);
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ctimer_stop(&c->t);
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}
/*---------------------------------------------------------------------------*/
void
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trickle_send(struct trickle_conn *c)
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{
if(c->q != NULL) {
queuebuf_free(c->q);
}
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c->q = queuebuf_new_from_rimebuf();
c->seqno++;
PRINTF("%d.%d: trickle send seqno %d\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
c->seqno);
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send(c);
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}
/*---------------------------------------------------------------------------*/
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/** @} */