193 lines
8.1 KiB
C
193 lines
8.1 KiB
C
/*
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* Copyright (c) 2014, SICS Swedish ICT.
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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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* This file is part of the Contiki operating system.
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*
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*/
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#ifndef __TSCH_QUEUE_H__
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#define __TSCH_QUEUE_H__
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/********** Includes **********/
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#include "contiki.h"
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#include "lib/ringbufindex.h"
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#include "net/linkaddr.h"
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#include "net/mac/tsch/tsch-schedule.h"
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/******** Configuration *******/
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/* The maximum number of outgoing packets towards each neighbor
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* Must be power of two to enable atomic ringbuf operations.
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* Note: the total number of outgoing packets in the system (for
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* all neighbors) is defined via QUEUEBUF_CONF_NUM */
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#ifdef TSCH_QUEUE_CONF_NUM_PER_NEIGHBOR
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#define TSCH_QUEUE_NUM_PER_NEIGHBOR TSCH_QUEUE_CONF_NUM_PER_NEIGHBOR
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#else
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/* By default, round QUEUEBUF_CONF_NUM to next power of two
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* (in the range [4;256]) */
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#if QUEUEBUF_CONF_NUM <= 4
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#define TSCH_QUEUE_NUM_PER_NEIGHBOR 4
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#elif QUEUEBUF_CONF_NUM <= 8
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#define TSCH_QUEUE_NUM_PER_NEIGHBOR 8
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#elif QUEUEBUF_CONF_NUM <= 16
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#define TSCH_QUEUE_NUM_PER_NEIGHBOR 16
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#elif QUEUEBUF_CONF_NUM <= 32
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#define TSCH_QUEUE_NUM_PER_NEIGHBOR 32
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#elif QUEUEBUF_CONF_NUM <= 64
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#define TSCH_QUEUE_NUM_PER_NEIGHBOR 64
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#elif QUEUEBUF_CONF_NUM <= 128
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#define TSCH_QUEUE_NUM_PER_NEIGHBOR 128
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#else
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#define TSCH_QUEUE_NUM_PER_NEIGHBOR 256
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#endif
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#endif
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/* The number of neighbor queues. There are two queues allocated at all times:
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* one for EBs, one for broadcasts. Other queues are for unicast to neighbors */
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#ifdef TSCH_QUEUE_CONF_MAX_NEIGHBOR_QUEUES
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#define TSCH_QUEUE_MAX_NEIGHBOR_QUEUES TSCH_QUEUE_CONF_MAX_NEIGHBOR_QUEUES
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#else
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#define TSCH_QUEUE_MAX_NEIGHBOR_QUEUES ((NBR_TABLE_CONF_MAX_NEIGHBORS) + 2)
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#endif
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/* TSCH CSMA-CA parameters, see IEEE 802.15.4e-2012 */
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/* Min backoff exponent */
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#ifdef TSCH_CONF_MAC_MIN_BE
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#define TSCH_MAC_MIN_BE TSCH_CONF_MAC_MIN_BE
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#else
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#define TSCH_MAC_MIN_BE 1
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#endif
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/* Max backoff exponent */
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#ifdef TSCH_CONF_MAC_MAX_BE
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#define TSCH_MAC_MAX_BE TSCH_CONF_MAC_MAX_BE
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#else
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#define TSCH_MAC_MAX_BE 7
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#endif
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/* Max number of re-transmissions */
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#ifdef TSCH_CONF_MAC_MAX_FRAME_RETRIES
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#define TSCH_MAC_MAX_FRAME_RETRIES TSCH_CONF_MAC_MAX_FRAME_RETRIES
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#else
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#define TSCH_MAC_MAX_FRAME_RETRIES 8
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#endif
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/*********** Callbacks *********/
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/* Called by TSCH when switching time source */
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#ifdef TSCH_CALLBACK_NEW_TIME_SOURCE
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struct tsch_neighbor;
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void TSCH_CALLBACK_NEW_TIME_SOURCE(const struct tsch_neighbor *old, const struct tsch_neighbor *new);
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#endif
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/* Called by TSCH every time a packet is ready to be added to the send queue */
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#ifdef TSCH_CALLBACK_PACKET_READY
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void TSCH_CALLBACK_PACKET_READY(void);
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#endif
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/************ Types ***********/
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/* TSCH packet information */
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struct tsch_packet {
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struct queuebuf *qb; /* pointer to the queuebuf to be sent */
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mac_callback_t sent; /* callback for this packet */
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void *ptr; /* MAC callback parameter */
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uint8_t transmissions; /* #transmissions performed for this packet */
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uint8_t ret; /* status -- MAC return code */
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uint8_t header_len; /* length of header and header IEs (needed for link-layer security) */
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uint8_t tsch_sync_ie_offset; /* Offset within the frame used for quick update of EB ASN and join priority */
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};
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/* TSCH neighbor information */
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struct tsch_neighbor {
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/* Neighbors are stored as a list: "next" must be the first field */
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struct tsch_neighbor *next;
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linkaddr_t addr; /* MAC address of the neighbor */
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uint8_t is_broadcast; /* is this neighbor a virtual neighbor used for broadcast (of data packets or EBs) */
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uint8_t is_time_source; /* is this neighbor a time source? */
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uint8_t backoff_exponent; /* CSMA backoff exponent */
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uint8_t backoff_window; /* CSMA backoff window (number of slots to skip) */
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uint8_t last_backoff_window; /* Last CSMA backoff window */
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uint8_t tx_links_count; /* How many links do we have to this neighbor? */
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uint8_t dedicated_tx_links_count; /* How many dedicated links do we have to this neighbor? */
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/* Array for the ringbuf. Contains pointers to packets.
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* Its size must be a power of two to allow for atomic put */
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struct tsch_packet *tx_array[TSCH_QUEUE_NUM_PER_NEIGHBOR];
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/* Circular buffer of pointers to packet. */
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struct ringbufindex tx_ringbuf;
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};
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/***** External Variables *****/
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/* Broadcast and EB virtual neighbors */
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extern struct tsch_neighbor *n_broadcast;
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extern struct tsch_neighbor *n_eb;
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/********** Functions *********/
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/* Add a TSCH neighbor */
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struct tsch_neighbor *tsch_queue_add_nbr(const linkaddr_t *addr);
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/* Get a TSCH neighbor */
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struct tsch_neighbor *tsch_queue_get_nbr(const linkaddr_t *addr);
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/* Get a TSCH time source (we currently assume there is only one) */
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struct tsch_neighbor *tsch_queue_get_time_source(void);
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/* Update TSCH time source */
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int tsch_queue_update_time_source(const linkaddr_t *new_addr);
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/* Add packet to neighbor queue. Use same lockfree implementation as ringbuf.c (put is atomic) */
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struct tsch_packet *tsch_queue_add_packet(const linkaddr_t *addr, mac_callback_t sent, void *ptr);
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/* Returns the number of packets currently a given neighbor queue */
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int tsch_queue_packet_count(const linkaddr_t *addr);
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/* Remove first packet from a neighbor queue. The packet is stored in a separate
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* dequeued packet list, for later processing. Return the packet. */
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struct tsch_packet *tsch_queue_remove_packet_from_queue(struct tsch_neighbor *n);
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/* Free a packet */
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void tsch_queue_free_packet(struct tsch_packet *p);
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/* Flush all neighbor queues */
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void tsch_queue_flush_all(void);
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/* Deallocate neighbors with empty queue */
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void tsch_queue_free_unused_neighbors(void);
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/* Is the neighbor queue empty? */
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int tsch_queue_is_empty(const struct tsch_neighbor *n);
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/* Returns the first packet from a neighbor queue */
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struct tsch_packet *tsch_queue_get_packet_for_nbr(const struct tsch_neighbor *n, struct tsch_link *link);
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/* Returns the head packet from a neighbor queue (from neighbor address) */
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struct tsch_packet *tsch_queue_get_packet_for_dest_addr(const linkaddr_t *addr, struct tsch_link *link);
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/* Returns the head packet of any neighbor queue with zero backoff counter.
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* Writes pointer to the neighbor in *n */
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struct tsch_packet *tsch_queue_get_unicast_packet_for_any(struct tsch_neighbor **n, struct tsch_link *link);
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/* May the neighbor transmit over a share link? */
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int tsch_queue_backoff_expired(const struct tsch_neighbor *n);
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/* Reset neighbor backoff */
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void tsch_queue_backoff_reset(struct tsch_neighbor *n);
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/* Increment backoff exponent, pick a new window */
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void tsch_queue_backoff_inc(struct tsch_neighbor *n);
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/* Decrement backoff window for all queues directed at dest_addr */
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void tsch_queue_update_all_backoff_windows(const linkaddr_t *dest_addr);
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/* Initialize TSCH queue module */
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void tsch_queue_init(void);
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#endif /* __TSCH_QUEUE_H__ */
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