nes-proj/core/net/rime/collect-link-estimate.h

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/*
* Copyright (c) 2010, Swedish Institute of Computer Science.
* 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.
*
*/
/**
* \file
* Header file for the Collect link estimate
* \author
* Adam Dunkels <adam@sics.se>
*/
/**
* \addtogroup rime
* @{
*/
/**
* \defgroup rimelinkestimate Link estimate management
*
* The link estimate module is used for computing estimations of link
* quality. It computes a quality index for links, based on
* information about how many times a packet has been transmitted, as
* well as information about incoming packets. The link estimate
* module exposes an interface that provides functions that are called
* for incoming and outgoing packets.
*/
#ifndef COLLECT_LINK_ESTIMATE_H
#define COLLECT_LINK_ESTIMATE_H
#define COLLECT_LINK_ESTIMATE_UNIT 8
struct collect_link_estimate {
uint32_t etx_accumulator;
uint8_t num_estimates;
};
/**
* \brief Initialize a new link estimate
* \param le A pointer to a link estimate structure
*
* This function initializes a link estimate.
*/
void collect_link_estimate_new(struct collect_link_estimate *le);
/**
* \brief Update a link estimate when a packet has been sent.
* \param le A pointer to a link estimate structure
* \param num_tx The number of times the packet was transmitted before it was ACKed
*
* This function updates a link estimate. This function is
* called when a packet has been sent. The function may
* use information from the packet buffer and the packet
* buffer attributes when computing the link estimate.
*/
void collect_link_estimate_update_tx(struct collect_link_estimate *le,
uint8_t num_tx);
/**
* \brief Update a link estimate when a packet has failed to be sent.
* \param le A pointer to a link estimate structure
* \param num_tx The number of times the packet was transmitted before it was given up on.
*
* This function updates a link estimate. This function is
* called when a packet has been sent. The function may
* use information from the packet buffer and the packet
* buffer attributes when computing the link estimate.
*/
void collect_link_estimate_update_tx_fail(struct collect_link_estimate *le,
uint8_t num_tx);
/**
* \brief Update a link estimate when a packet has been received.
* \param le A pointer to a link estimate structure
*
* This function updates a link estimate. This function is
* called when a packet has been received. The function
* uses information from the packet buffer and its
* attributes.
*/
void collect_link_estimate_update_rx(struct collect_link_estimate *le);
/**
* \brief Compute the link estimate metric for a link estimate
* \param le A pointer to a link estimate structure
* \return The current link estimate metric
*
*/
uint16_t collect_link_estimate(struct collect_link_estimate *le);
int collect_link_estimate_num_estimates(struct collect_link_estimate *le);
#endif /* COLLECT_LINK_ESTIMATE_H */
/** @} */