osd-contiki/core/net/mac/tsch/tsch-queue.h

178 lines
7.5 KiB
C

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