127 lines
4.6 KiB
C
127 lines
4.6 KiB
C
/*
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* Copyright (c) 2015, Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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/**
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* \file
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* Orchestra: a slotframe dedicated to transmission of EBs.
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* Nodes transmit at a timeslot defined as hash(MAC) % ORCHESTRA_EBSF_PERIOD
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* Nodes listen at a timeslot defined as hash(time_source.MAC) % ORCHESTRA_EBSF_PERIOD
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* \author Simon Duquennoy <simonduq@sics.se>
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*/
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#include "contiki.h"
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#include "orchestra.h"
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#include "net/packetbuf.h"
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static uint16_t slotframe_handle = 0;
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static uint16_t channel_offset = 0;
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static struct tsch_slotframe *sf_eb;
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/*---------------------------------------------------------------------------*/
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static uint16_t
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get_node_timeslot(const linkaddr_t *addr)
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{
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#if ORCHESTRA_EBSF_PERIOD > 0
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return ORCHESTRA_LINKADDR_HASH(addr) % ORCHESTRA_EBSF_PERIOD;
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#else
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return 0xffff;
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#endif
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}
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/*---------------------------------------------------------------------------*/
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static int
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select_packet(uint16_t *slotframe, uint16_t *timeslot)
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{
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/* Select EBs only */
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if(packetbuf_attr(PACKETBUF_ATTR_FRAME_TYPE) == FRAME802154_BEACONFRAME) {
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if(slotframe != NULL) {
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*slotframe = slotframe_handle;
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}
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if(timeslot != NULL) {
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*timeslot = get_node_timeslot(&linkaddr_node_addr);
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}
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return 1;
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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static void
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new_time_source(const struct tsch_neighbor *old, const struct tsch_neighbor *new)
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{
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uint16_t old_ts = old != NULL ? get_node_timeslot(&old->addr) : 0xffff;
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uint16_t new_ts = new != NULL ? get_node_timeslot(&new->addr) : 0xffff;
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if(new_ts == old_ts) {
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return;
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}
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if(old_ts != 0xffff) {
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/* Stop listening to the old time source's EBs */
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if(old_ts == get_node_timeslot(&linkaddr_node_addr)) {
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/* This was the same timeslot as slot. Reset original link options */
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tsch_schedule_add_link(sf_eb, LINK_OPTION_TX, LINK_TYPE_ADVERTISING_ONLY,
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&tsch_broadcast_address, old_ts, 0);
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} else {
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/* Remove slot */
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tsch_schedule_remove_link_by_timeslot(sf_eb, old_ts);
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}
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}
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if(new_ts != 0xffff) {
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uint8_t link_options = LINK_OPTION_RX;
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if(new_ts == get_node_timeslot(&linkaddr_node_addr)) {
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/* This is also our timeslot, add necessary flags */
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link_options |= LINK_OPTION_TX;
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}
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/* Listen to the time source's EBs */
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tsch_schedule_add_link(sf_eb, link_options, LINK_TYPE_ADVERTISING_ONLY,
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&tsch_broadcast_address, new_ts, 0);
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}
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}
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/*---------------------------------------------------------------------------*/
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static void
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init(uint16_t sf_handle)
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{
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slotframe_handle = sf_handle;
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channel_offset = sf_handle;
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sf_eb = tsch_schedule_add_slotframe(slotframe_handle, ORCHESTRA_EBSF_PERIOD);
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/* EB link: every neighbor uses its own to avoid contention */
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tsch_schedule_add_link(sf_eb,
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LINK_OPTION_TX,
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LINK_TYPE_ADVERTISING_ONLY, &tsch_broadcast_address,
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get_node_timeslot(&linkaddr_node_addr), 0);
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}
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/*---------------------------------------------------------------------------*/
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struct orchestra_rule eb_per_time_source = {
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init,
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new_time_source,
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select_packet,
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NULL,
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NULL,
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};
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