nes-proj/os/net/link-stats.h

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/*
* Copyright (c) 2015, 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.
*
*
* Authors: Simon Duquennoy <simonduq@sics.se>
*/
#ifndef LINK_STATS_H_
#define LINK_STATS_H_
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#include "net/linkaddr.h"
/* ETX fixed point divisor. 128 is the value used by RPL (RFC 6551 and RFC 6719) */
#ifdef LINK_STATS_CONF_ETX_DIVISOR
#define LINK_STATS_ETX_DIVISOR LINK_STATS_CONF_ETX_DIVISOR
#else /* LINK_STATS_CONF_ETX_DIVISOR */
#define LINK_STATS_ETX_DIVISOR 128
#endif /* LINK_STATS_CONF_ETX_DIVISOR */
/* Option to infer the initial ETX from the RSSI of previously received packets. */
#ifdef LINK_STATS_CONF_INIT_ETX_FROM_RSSI
#define LINK_STATS_INIT_ETX_FROM_RSSI LINK_STATS_CONF_INIT_ETX_FROM_RSSI
#else /* LINK_STATS_CONF_INIT_ETX_FROM_RSSI */
#define LINK_STATS_INIT_ETX_FROM_RSSI 1
#endif /* LINK_STATS_CONF_INIT_ETX_FROM_RSSI */
/* Option to use packet and ACK count for ETX estimation, instead of EWMA */
#ifdef LINK_STATS_CONF_ETX_FROM_PACKET_COUNT
#define LINK_STATS_ETX_FROM_PACKET_COUNT LINK_STATS_CONF_ETX_FROM_PACKET_COUNT
#else /* LINK_STATS_CONF_ETX_FROM_PACKET_COUNT */
#define LINK_STATS_ETX_FROM_PACKET_COUNT 0
#endif /* LINK_STATS_ETX_FROM_PACKET_COUNT */
/* All statistics of a given link */
struct link_stats {
clock_time_t last_tx_time; /* Last Tx timestamp */
uint16_t etx; /* ETX using ETX_DIVISOR as fixed point divisor */
int16_t rssi; /* RSSI (received signal strength) */
uint8_t freshness; /* Freshness of the statistics */
#if LINK_STATS_ETX_FROM_PACKET_COUNT
uint8_t tx_count; /* Tx count, used for ETX calculation */
uint8_t ack_count; /* ACK count, used for ETX calculation */
#endif /* LINK_STATS_ETX_FROM_PACKET_COUNT */
};
/* Returns the neighbor's link statistics */
const struct link_stats *link_stats_from_lladdr(const linkaddr_t *lladdr);
/* Are the statistics fresh? */
int link_stats_is_fresh(const struct link_stats *stats);
/* Resets link-stats module */
void link_stats_reset(void);
/* Initializes link-stats module */
void link_stats_init(void);
/* Packet sent callback. Updates statistics for transmissions on a given link */
void link_stats_packet_sent(const linkaddr_t *lladdr, int status, int numtx);
/* Packet input callback. Updates statistics for receptions on a given link */
void link_stats_input_callback(const linkaddr_t *lladdr);
#endif /* LINK_STATS_H_ */