mirror of
https://github.com/oliverschmidt/contiki.git
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195 lines
6.9 KiB
C
195 lines
6.9 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 unicast data transmission.
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* If sender-based:
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* Nodes listen at a timeslot defined as hash(MAC) % ORCHESTRA_SB_UNICAST_PERIOD
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* Nodes transmit at: for each nbr in RPL children and RPL preferred parent,
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* hash(nbr.MAC) % ORCHESTRA_SB_UNICAST_PERIOD
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* If receiver-based: the opposite
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*
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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/ipv6/uip-ds6-route.h"
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#include "net/packetbuf.h"
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#if ORCHESTRA_UNICAST_SENDER_BASED && ORCHESTRA_COLLISION_FREE_HASH
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#define UNICAST_SLOT_SHARED_FLAG ((ORCHESTRA_UNICAST_PERIOD < (ORCHESTRA_MAX_HASH + 1)) ? LINK_OPTION_SHARED : 0)
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#else
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#define UNICAST_SLOT_SHARED_FLAG LINK_OPTION_SHARED
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#endif
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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_unicast;
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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(addr != NULL && ORCHESTRA_UNICAST_PERIOD > 0) {
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return ORCHESTRA_LINKADDR_HASH(addr) % ORCHESTRA_UNICAST_PERIOD;
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} else {
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return 0xffff;
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}
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}
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/*---------------------------------------------------------------------------*/
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static int
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neighbor_has_uc_link(const linkaddr_t *linkaddr)
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{
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if(linkaddr != NULL && !linkaddr_cmp(linkaddr, &linkaddr_null)) {
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if((orchestra_parent_knows_us || !ORCHESTRA_UNICAST_SENDER_BASED)
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&& linkaddr_cmp(&orchestra_parent_linkaddr, linkaddr)) {
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return 1;
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}
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if(nbr_table_get_from_lladdr(nbr_routes, (linkaddr_t *)linkaddr) != NULL) {
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return 1;
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}
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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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add_uc_link(const linkaddr_t *linkaddr)
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{
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if(linkaddr != NULL) {
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uint16_t timeslot = get_node_timeslot(linkaddr);
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tsch_schedule_add_link(sf_unicast,
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ORCHESTRA_UNICAST_SENDER_BASED ? LINK_OPTION_RX : LINK_OPTION_TX | UNICAST_SLOT_SHARED_FLAG,
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LINK_TYPE_NORMAL, &tsch_broadcast_address,
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timeslot, channel_offset);
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}
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}
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/*---------------------------------------------------------------------------*/
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static void
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remove_uc_link(const linkaddr_t *linkaddr)
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{
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uint16_t timeslot;
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struct tsch_link *l;
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if(linkaddr == NULL) {
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return;
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}
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timeslot = get_node_timeslot(linkaddr);
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l = tsch_schedule_get_link_by_timeslot(sf_unicast, timeslot);
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if(l == NULL) {
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return;
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}
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/* Does our current parent need this timeslot? */
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if(timeslot == get_node_timeslot(&orchestra_parent_linkaddr)) {
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/* Yes, this timeslot is being used, return */
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return;
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}
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/* Does any other child need this timeslot?
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* (lookup all route next hops) */
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nbr_table_item_t *item = nbr_table_head(nbr_routes);
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while(item != NULL) {
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linkaddr_t *addr = nbr_table_get_lladdr(nbr_routes, item);
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if(timeslot == get_node_timeslot(addr)) {
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/* Yes, this timeslot is being used, return */
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return;
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}
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item = nbr_table_next(nbr_routes, item);
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}
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tsch_schedule_remove_link(sf_unicast, l);
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}
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/*---------------------------------------------------------------------------*/
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static void
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child_added(const linkaddr_t *linkaddr)
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{
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add_uc_link(linkaddr);
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}
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/*---------------------------------------------------------------------------*/
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static void
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child_removed(const linkaddr_t *linkaddr)
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{
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remove_uc_link(linkaddr);
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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 data packets we have a unicast link to */
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const linkaddr_t *dest = packetbuf_addr(PACKETBUF_ADDR_RECEIVER);
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if(packetbuf_attr(PACKETBUF_ATTR_FRAME_TYPE) == FRAME802154_DATAFRAME
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&& neighbor_has_uc_link(dest)) {
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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 = ORCHESTRA_UNICAST_SENDER_BASED ? get_node_timeslot(&linkaddr_node_addr) : get_node_timeslot(dest);
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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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if(new != old) {
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const linkaddr_t *new_addr = new != NULL ? &new->addr : NULL;
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if(new_addr != NULL) {
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linkaddr_copy(&orchestra_parent_linkaddr, new_addr);
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} else {
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linkaddr_copy(&orchestra_parent_linkaddr, &linkaddr_null);
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}
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remove_uc_link(new_addr);
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add_uc_link(new_addr);
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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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/* Slotframe for unicast transmissions */
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sf_unicast = tsch_schedule_add_slotframe(slotframe_handle, ORCHESTRA_UNICAST_PERIOD);
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uint16_t timeslot = get_node_timeslot(&linkaddr_node_addr);
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tsch_schedule_add_link(sf_unicast,
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ORCHESTRA_UNICAST_SENDER_BASED ? LINK_OPTION_TX | UNICAST_SLOT_SHARED_FLAG: LINK_OPTION_RX,
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LINK_TYPE_NORMAL, &tsch_broadcast_address,
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timeslot, channel_offset);
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}
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/*---------------------------------------------------------------------------*/
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struct orchestra_rule unicast_per_neighbor = {
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init,
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new_time_source,
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select_packet,
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child_added,
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child_removed,
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};
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